U.S. patent application number 12/141552 was filed with the patent office on 2008-10-16 for interactive electronic device with optical page identification system.
This patent application is currently assigned to MATTEL, INC.. Invention is credited to Christopher D. Cimerman, Stephen M. Ernst, James P. Meade, John W. Taylor.
Application Number | 20080254428 12/141552 |
Document ID | / |
Family ID | 32850813 |
Filed Date | 2008-10-16 |
United States Patent
Application |
20080254428 |
Kind Code |
A1 |
Taylor; John W. ; et
al. |
October 16, 2008 |
INTERACTIVE ELECTRONIC DEVICE WITH OPTICAL PAGE IDENTIFICATION
SYSTEM
Abstract
An electronic learning device for receiving a book having a
plurality of successive page spreads, at least one page spread
having selectable content and an optically readable page
identifier. The device includes a housing configured to receive the
book, a position sensor in the housing configured to determine the
location of the selectable content on the at least one page spread,
an optical sensor in the housing configured to irradiate and detect
the page identifier on the at least one page spread and control
electronics in the housing operatively coupled to the optical
sensor and to the position sensor and configured to synchronize
operation of the position sensor and the optical sensor.
Inventors: |
Taylor; John W.; (Elma,
NY) ; Meade; James P.; (Hamburg, NY) ;
Cimerman; Christopher D.; (Clarence Center, NY) ;
Ernst; Stephen M.; (Colorado Springs, CO) |
Correspondence
Address: |
PANITCH SCHWARZE BELISARIO & NADEL LLP
ONE COMMERCE SQUARE, 2005 MARKET STREET, SUITE 2200
PHILADELPHIA
PA
19103
US
|
Assignee: |
MATTEL, INC.
El Segundo
CA
|
Family ID: |
32850813 |
Appl. No.: |
12/141552 |
Filed: |
June 18, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10767321 |
Jan 29, 2004 |
|
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12141552 |
|
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60443967 |
Jan 31, 2003 |
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Current U.S.
Class: |
434/317 |
Current CPC
Class: |
G09B 5/02 20130101; G09B
5/062 20130101 |
Class at
Publication: |
434/317 |
International
Class: |
G09B 5/00 20060101
G09B005/00 |
Claims
1. An electronic learning device for receiving a book having a
plurality of successive page spreads, at least one page spread
having selectable content and an optically readable page
identifier, the device comprising: a housing configured to receive
the book; a position sensor in the housing, the position sensor
configured to determine the location of the selectable content on
the at least one page spread; an optical sensor in the housing, the
optical sensor configured to irradiate and detect the page
identifier on the at least one page spread; control electronics in
the housing, the control electronics operatively coupled to the
optical sensor and to the position sensor, the control electronics
configured to synchronize operation of the position sensor and the
optical sensor.
2. The device according to claim 1, wherein the position sensor
comprises a plurality of at least touch-responsive, mutually
adjoining sensors organized in a two-dimensional array, the array
being formed by separate and separated first and second sets of
generally parallel, individual conductive lines transversely
crossing over each other beneath an upper surface of the housing, a
radio frequency oscillating signal generator cyclically coupled to
individual conductive lines of the first set; and a synchronous
detection circuit operatively coupled with the generator and with
individual conductive lines of the second set to identify user
selected individual cross-points of the first and second sets of
lines of the array.
3. The device according to claim 1 wherein the optical sensor
comprises an array of optical emitter and optical detector pairs, a
radio frequency oscillating signal generator cyclically coupled to
each individual optical emitter, and a synchronous detection
circuit operatively coupled with the optical detectors.
4. The device according to claim 1 wherein the position sensor
comprises a plurality of at least touch-responsive, mutually
adjoining sensors organized in a two-dimensional array, the array
being formed by separate and separated first and second sets of
generally parallel, individual conductive lines transversely
crossing over each other beneath an upper surface of the housing, a
radio frequency oscillating signal generator cyclically coupled to
individual conductive lines of the first set; and a synchronous
detection circuit operatively coupled with the generator and with
individual conductive lines of the second set to identify user
selected individual cross-points of the first and second sets of
lines of the array; and the optical sensor comprises a plurality of
optical emitter and optical detector pairs controlled and
synchronized with the operation of the position sensor by an
optical switch and gate under the control of the control
electronics in the housing.
5. An electronic learning device comprising: a page having an
optical identification code and selectable content; a housing
configured to support the page; an integrated sensor system
configured to irradiate and detect the optical identification code
and to detect the location of the selectable content; and control
electronics in the housing, the control electronics operatively
coupled to the integrated sensor system and configured to
synchronize the irradiation and detection of the optical
identification code and the detection of the location of the
selectable content and to produce an audible response associated
with the selectable content when the page is supported by the
housing and the selectable content is selected.
6. The electronic learning device according to claim 5, wherein the
integrated sensor system comprises a position sensor and an optical
sensor, the position sensor comprising a plurality of at least
touch-responsive, mutually adjoining sensors organized in a
two-dimensional array, the optical sensor comprising a plurality of
optical emitter and optical detector pairs.
7. The electronic learning device according to claim 6, wherein the
optical sensor is controlled and synchronized with the operation of
the position sensor by an optical switch and gate under the control
of the control electronics in the housing.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a Divisional Application of pending U.S.
patent application Ser. No. 10/767,321 filed Jan. 29, 2004, which
is incorporated herein by reference, and which claims the benefit
of U.S. Provisional Patent Application No. 60/443,967, filed Jan.
31, 2003.
BACKGROUND OF THE INVENTION
[0002] The present invention relates to an optical page
identification system for an interactive, electronic system using
books. More particularly, the present invention relates to an
autonomous, optical page-identification system that communicates to
the system controller the identity of the page that is viewable by
the user.
[0003] Certain interactive, electronic systems allow a child to
activate electronic speech, sound and lights by pointing to words
or images on the cover and pages of multi-page books used with a
reader or base unit. The principle components of the typical system
are the base unit housing system electronics, one or more books
each removably mountable in the base unit, for an example in a book
well, and a read only memory ("ROM"), either within the base unit
or within cartridges removably connected with the base unit and
storing software associated with the content of the books. In
addition to book-based activity, letters of the alphabet, numerals
or other graphics may be provided on the upwardly facing surface of
the base unit to allow alphabet, number or graphics based learning
or game play when a book is not present in the unit.
[0004] The conventional hardware for the implementing the
aforementioned systems is generally not user friendly. A hardwired
stylus or difficult to press pressure sensitive switches are
provided to identify the page being viewed and to select the
interactive content on the viewed page. This conventional hardware
usually requires an undesirable amount of assistance, instruction
and practice before a child can knowledgeably and properly use the
system, particularly pre-school children. For example, to identify
a currently viewable page or to detect a page turn, a child must be
instructed to recognize and then touch on the page a uniquely
positioned printed identification icon, such as a graphic having a
particular geometric shape or an easily recognizable key word such
as the word "Go". The systems are also error prone due to the
positional certainty of the pages of the book on the reader. The
systems are also prone to user induced errors such as failure to
identify or properly select the page identification icon before
interacting with a page or turning of multiple pages at once or the
partial turning of a page. Accordingly, the current page
identification and synchronization methods employed by conventional
book interaction systems result in a large percentage of
synchronization errors for young users.
[0005] An autonomous page identification system that communicates
to the system controller the identity of the page that is viewable
by the user without requiring user intervention provides a user
friendly system. More particularly, an autonomous page
identification system reducing or eliminating page synchronization
errors will significantly increase the value of other, conventional
aspects of such systems to users particularly pre-school users.
BRIEF SUMMARY OF THE INVENTION
[0006] In a first aspect, the invention is an electronic learning
device for receiving a book having a plurality of successive page
spreads. At least one page spread has selectable content and an
optically readable page identifier. The device comprises a housing
configured to receive the book. A position sensor is in the
housing. The position sensor is configured to determine the
location of the selectable content on the at least one page spread.
An optical sensor is provided in the housing. The optical sensor is
configured to irradiate and detect the page identifier on the at
least one page spread. Control electronics in the housing are
provided, the control electronics being operatively coupled to the
optical sensor and to the position sensor, and the control
electronics being configured to synchronize operation of the
position sensor and the optical sensor.
[0007] In a second aspect, the invention is an electronic learning
device comprising a page having an optical identification code and
selectable content. A housing is configured to support the page. An
integrated sensor system is configured to irradiate and detect the
optical identification code and to detect the location of the
selectable content. Control electronics in the housing are
operatively coupled to the integrated sensor system and configured
to synchronize the irradiation and detection of the optical
identification code and the detection of the location of the
selectable content and to produce an audible response associated
with the selectable content when the page is supported by the
housing and the selectable content is selected.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0008] The foregoing summary, as well as the following detailed
description of preferred embodiments of the invention, will be
better understood when read in conjunction with the appended
drawings. For the purpose of illustrating the invention, there are
shown in the drawings embodiments which are presently preferred. It
should be understood, however, that the invention is not limited to
the precise arrangements and instrumentalities shown.
[0009] In the drawings:
[0010] FIG. 1 is a schematic block diagram of an interactive
electronic learning system having an autonomous page identification
system in accordance with the present invention;
[0011] FIG. 2 is a top perspective view of the main components of
the electronic learning system schematically illustrated in FIG.
1;
[0012] FIG. 2A is an enlarged top plan view of an emitter-detector
pair of the page identification system of the electronic learning
system of FIG. 2;
[0013] FIG. 3 is a cross-section view of the emitter-detector pair
of FIG. 2A, taken along line 3-3;
[0014] FIGS. 4A through 4G are a series of top plan views of an
upper portion of a book of the electronic learning system of FIG.
2, showing several of a plurality of page spread configurations of
the book and also showing in particular closed-hole and open-hole
locations forming page identifiers corresponding to each of the
several page spread configurations;
[0015] FIG. 5 is a table summarizing the status of hole locations
forming each of the plurality of page identifiers corresponding,
respectively, to each of the plurality of page spread
configurations of the book of the electronic learning system of
FIG. 2;
[0016] FIGS. 6A through 6G are a series of bottom plan views of the
portion of the book of FIGS. 4A through 4G, as seen by a plurality
of emitter-detector pairs when the book is operatively installed in
an electronic learning device of the electronic learning system of
FIG. 2;
[0017] FIG. 7 is a table summarizing the status of hole locations
forming each of the plurality of page identifiers as seen by the
plurality of emitter-detector pairs when the book is operatively
installed in the electronic learning device of FIG. 2;
[0018] FIG. 8 is a block diagram of control electronics of the page
identification system of FIG. 1;
[0019] FIG. 9 is a top plan view of an upper portion of an
alternate embodiment of the book of the electronic learning system
of FIG. 2, showing one of a plurality of page spread configurations
of the book and illustrating an alternative embodiment of
closed-hole and open-hole locations forming page identifiers
corresponding to each of the several page spread
configurations;
[0020] FIG. 10 is a top plan view of an upper portion of another
alternate embodiment of the book of the electronic learning system
of FIG. 2, showing one of a plurality of page spread configurations
of the book and illustrating another alternative embodiment of
closed-hole and open-hole locations forming page identifiers
corresponding to each of the several page spread
configurations;
[0021] FIG. 11 is a plan view of a preferred embodiment of one of
the sensor matrices comprising a preferred embodiment of the
position sensor; and
[0022] FIG. 12 is a cross-sections view of a preferred embodiment
of the position sensor.
DETAILED DESCRIPTION OF THE INVENTION
[0023] Certain terminology is used in the following description for
convenience only and is not limiting. The words "right," "left,"
"lower" and "upper" designate directions in the drawings to which
reference is made. The words "inwardly" and "outwardly" refer to
directions toward and away from, respectively, the geometric center
of an interactive, electronic learning system having an optical
page identification system in accordance with the present
invention, and designated parts thereof. The terminology includes
the words noted above, derivatives thereof and words of similar
import.
[0024] Referring to FIGS. 1-10, there are shown preferred
embodiments of the invention in the form of an interactive,
electronic learning system, generally designated 10. The electronic
learning system 10 includes an electronic learning device or base
unit 20, and one or more books 60. Given the limitations of present
consumer electronics, the system 10 may include one or more ROM
cartridges 50, or other form mass electronic data storage, that can
be removably connected with the base unit 20. The electronic
learning device 20 also includes an integrated sensor system 100
(FIG. 8) having a position sensor 110 and, according to the present
invention, an optical sensor system 120. With the exception of the
integrated sensor system 100 disclosed in detail below, the
electronic learning system 10 has substantially the same features
as the electronic learning systems which are the subject of
co-pending U.S. Patent applications filed by the assignee of the
present invention. The co-pending applications are U.S. patent
application Ser. No. 10/448,581 (Pub. No. 2004-0076935 A1), "Method
for Teaching Linguistics"; U.S. patent application Ser. No.
10/448,582 (issued on Apr. 10, 2007 as U.S. Pat. No. 7,203,455 B2),
"Interactive Multi-Sensory Reading System Electronic
Teaching/Learning Device"; and U.S. patent application Ser. No.
10/448,583 (Pub. No. 2004-0043365 A1), "Electronic Learning Device
for an Interactive Multi-Sensory Reading System", all having filing
dates of May 30, 2003. The disclosures of these co-pending
applications and that of Provisional Application No. 60/443,967
related hereto are hereby incorporated herein by reference.
[0025] With reference now to FIGS. 1 and 2, the electronic learning
system 10 includes the electronic learning device 20 for receiving
the book 60 having a plurality of successive page spreads. As
discussed below, at least one page spread of the book 60 has an
optically readable page identifier. Additionally, at least one page
of the book 60 has selectable content (not shown). The selectable
content may be, for example, graphics disposed on the at least one
page.
[0026] The electronic learning device 20 comprises a housing 22
configured to receive the book 60. The housing 22 includes a left
hand portion 24 and a right hand portion 26. The two portions 24,
26 are hinged together by a hinge 28. A handle 30 is provided to
allow the electronic learning device 20 to be conveniently
transported when the left and right hand portions 24, 26 are placed
in a closed position. Each portion 24, 26 includes a recess. The
two recesses together form a book well 32 sized and shaped to
releaseably receive the book 60. The artisan will appreciated by
that changes could be made to the configuration of the housing 22
without departing from the broad inventive concept of the
invention. For example, the housing 22 can have a unitary
construction without a hinge. Further the housing 22 can have a
substantially planar surface for receiving a book instead of a book
recess.
[0027] The electronic learning device 20 includes an on/off switch
34. The electronic learning device 20 includes a speech generator
36; a sound output device, such as a speaker 38; displays, such as
light emitting diodes 40; and base unit memory 44, all operatively
connected to a controller 42. The controller 42 may include a
general-purpose microcontroller, such as SUNPLUS.TM. Part No.
SPL130A, or the like. A power supply 46 provides power to the
electronic components of the electronic learning device 20.
Preferably, the power supply 46 is provided by dry-cell or
rechargeable batteries stored within the housing 22.
[0028] Referring to FIGS. 1 and 8, the integrated sensor system 100
comprises a position sensor 110 and an optical sensor 120
operatively coupled to sensor electronics 130 controlled by the
controller 42. In a preferred embodiment, the position sensor 110
comprise a plurality of at least touch-responsive, mutually
adjoining sensors organized in a two-dimensional array. The array
is formed by separate and separated first and second sets of
generally parallel, individual conductive lines transversely
crossing over each other beneath an upper surface of the housing
22. Further description of the array may be found in co-pending
U.S. Pat. No. 7,203,455 B2. A signal oscillator 132 is cyclically
coupled to individual conductive lines of the first set of
conductive lines. A synchronous detection circuit 150 is
operatively coupled with the signal generator 132 and with
individual conductive lines of the second set of conductive lines
to identify user selected individual cross-points of the first and
second sets of lines of the array. In other embodiments of the
invention, the position sensor 110 can be any position sensor
suitable for use with an electronic learning device, such as those
described in U.S. Pat. No. 5,686,705 and U.S. Pat. No. 6,661,405,
and that is adaptable for operation with the optical sensor
120.
[0029] The two-dimensional array comprising the position sensor 110
preferably is partitioned into a left-hand sixteen by sixteen
sensor matrix 112 and a right-hand sixteen by sixteen sensor matrix
114 (FIG. 8), respectively positioned in the corresponding left
hand portion 24 and right hand portion 26 of the housing 22. Each
sensor matrix 112, 114 has row and column conductive lines,
represented schematically in phantom in FIG. 2. The sensor matrices
112, 114 are adapted to detect the proximity of a user's finger.
Thus, the position sensor 110 is configured to determine the
location of the selectable content on the at least one page spread
when a user places a finger proximate selectable content overlaying
the sensor matrices 112, 114.
[0030] FIG. 11 shows the left-hand matrix 112 in accordance with an
exemplary embodiment of the present invention. The right-hand
matrix 114 is suggestedly a mirror image but could be of a
different configuration and construction. Each matrix 112, 114
suggestedly includes sixteen rows 101r and sixteen columns 101c of
the conductive lines or traces however different numbers of either
or both can be used. Each point where a row 101r and column 101c
line cross creates a single individual "cross-point" sensor. The
sixteen by sixteen line arrays therefore create two hundred and
fifty-six individual cross-point sensors arranged in a rectangular
array in the recesses of the left-hand portion 24 and right hand
portion 26 of the housing 22.
[0031] The individual traces 101r, 101c are extended to side and
bottom edges of an electrically insulative support sheet 102, for
example a Mylar plastic sheet. Preferably, shorter traces 103 and
104 are extended from the side and bottom edges, respectively, of
the sheet 102, one shorter trace 103 or 104 on either side of each
sensor trace 101r or 101c, respectively. The shorter traces 103 and
104 are all connected to system ground through or with the
conductive plane 105. The horizontal traces 104 extend inwardly
from the vertical edge to just beyond where the row traces 101r
widen out to form terminals and, with a uniform length, provide
some impedance control. The vertical traces 103 extend from the
bottom edge up to a point where the vertical traces 101c begin to
run parallel, just below where those traces are flared and to
within about one-half inch (12 mm) of the lowest cross-points.
Traces 103 prevent cross coupling between the column traces 101c
when the columns are being driven by oscillator 132.
[0032] FIG. 12 shows an example of the cross-sections of the
position sensor and depicts a plastic spacer 106, a plurality of
the spaced apart column (vertical) traces 101c, the non-conductive
(e.g. Mylar) sheet 102 and one of the spaced apart row (horizontal)
traces 101r transverse to the plurality of column traces 101c. The
non-conductive sheet 102 supports and separates the column traces
101c from the row traces 101r and forms with those traces arrays
112, 114. The sensor preferably includes a conductive plane 105 in
the form of a metal plate, connected to system ground and parallel
to and spaced away from the arrays 112, 114.
[0033] With reference now to FIGS. 1-3, the optical sensors 120
comprise an array of preferably identical optical emitter and
optical detector pairs indicated collectively at 122. Seven
individual pairs 122a-122g are located in the left hand portion 24
and seven more 122h-122n are located in the right-hand portion 26.
The radio frequency oscillating signal generator 132 is cyclically
coupled to each individual optical emitter 124 and the synchronous
detection circuit 150 is operatively coupled with each individual
optical detector 126 of each pair 122. Preferably, the
emitter-detector pairs 122 are mounted upwardly facing in the upper
margin of the left portion 24 and right portion 26 of the book well
32. Preferably, but not necessarily, the optical emitters 124 and
optical detectors 126 operate in the infra red (IR) portion of the
electromagnetic spectrum. However, the emitter-detector pairs 122
could operate at other wavelengths without departing from the scope
of the invention.
[0034] In the preferred embodiment shown in FIG. 2, a total of
fourteen emitter-detector pairs 122 are provided and are connected
to a circuit board 128 included as part of the control electronics
in the housing 22. The number of emitter-detector pairs 122 may by
more or less than fourteen and is determined by the number of hole
locations encoding the page identifiers in the book 60 as will be
described. The spacing between the emitter-detector pairs 122 may
be uniform or non-uniform provided that they are positioned to be
in registry with corresponding hole locations in each book 60.
Accordingly, the fourteen emitter-detector pairs 122 are positioned
at locations corresponding to fourteen potential hole locations 72a
through 72n in each book 60 in use, as will be described with
respect to FIGS. 4A-7, such that each emitter-detector pair 122a
through 122n has within its field of view the hole location 72a
through 72n with which it corresponds.
[0035] With reference now to FIGS. 1 and 8, the sensor electronics
130 are operatively coupled to the optical sensors 120, the
position sensor 110, and the controller 42. The sensor electronics
130, in conjunction with the controller 42 and memory 44, form a
set of control electronics configured to synchronize operation of
the position sensor 110 and the optical sensor 120. The sensor
electronics 130 include the signal oscillator 132, a column driver
circuit 134, a first sensor circuit 144 operatively coupled with
the left-hand position sensor matrix 112 and a second sensor
circuit 146 operatively coupled with the right-hand position sensor
matrix 114.
[0036] The sensor electronics 130 further include first and second
optical emitter circuits 136, 138, respectively, each operatively
coupled to seven optical emitters 124; first and second optical
detector circuits 140, 142, respectively, each operatively coupled
to seven optical detectors 126; a row select circuit 152; the
synchronous detector, multiplexer and filter 150; an optical switch
and gate 148; and an analog to digital (A/D) signal converter
154.
[0037] The electronic learning system 10 further preferably
comprises cartridge 50. In a preferred embodiment, the cartridge 50
is operatively coupled to the controller 42 by removably inserting
the cartridge 50 into the electronic learning device 20. The
cartridge 50 is preferably uniquely associated with the book 60. A
plurality of cartridge 50 and book 60 sets may be provided. The
cartridge 50 has memory 54 operatively connected to cartridge
control circuitry 52. Alternatively, the cartridge 50 could provide
only memory 54. Stored in the cartridge memory 54 is software
and/or data associated with the content of the book 60.
[0038] Turning now to FIGS. 2 and 4A-7, each book 60 is encoded for
optical page identification by the sensors 122. The book 60
comprises a plurality of pages and a plurality of successive page
spreads defined by the pages. Each page spread is defined either by
one side of a page (i.e. outer cover of a closed book) or by both a
second (left or even numbered) side of a first page and a first
(right or odd numbered) side of a second page. In this
illustration, the book 60 comprises fourteen pages and fifteen page
spreads but may have more or less than fourteen pages and
corresponding page spreads without departing from the scope and
spirit of the invention. The plurality of pages is preferably
connected by a spine 66 or any other well known binding.
[0039] FIGS. 4A-4G depict various page spreads from an exemplary
fourteen page book 60. Each of the fourteen pages is identified by
reference numerals 62: 62a-62n. Each of the two sides of each page
is represented by numerals 64: 64a for the first side (odd numbered
page) and 64b for the second side (even numbered page). Page
spreads are identified by reference numerals 68: 68a-68o for the
fifteen spreads by fourteen pages. FIGS. 4A-4G represent various
page spreads as the spreads are seen by the user, that is top plan
views of the book 60 and the spreads 122.
[0040] With reference to FIG. 4A, in the preferred embodiment of
the book 60, a first page spread 68a is formed by a first side 64a
of a first page 62a. This is a closed book lying on its rear cover.
With reference to FIGS. 2 and 4B, a second page spread 68b is
formed by a second side 64b of the first page 62a and a first side
64a of a second page 62b. With reference to FIGS. 4C-4G, a third
page spread 68c is formed by the second side 64b of the second page
62b and the first side 64a of a third page 62c (FIG. 4C); an eighth
page spread 68h is formed by the second side 64b of the seventh
page 62g and the first side 64a of an eighth page 62h (FIG. 4D); a
ninth page spread 68i is formed by the second side 64b of the
eighth page 62h and the first side 64a of a ninth page 62i (FIG.
4E); a tenth page spread 68j is formed by the second side 64b of
the ninth page 62i and the first side 64a of a tenth page 62j (FIG.
4F); and a fifteenth page spread 68o is formed by the second side
64b of a fourteenth page 62n (FIG. 4G). Fourth through seventh and
eleventh through fourteenth page spreads of the book 60 are not
illustrated, but are page spreads formed by the second (or left)
side and the first (or right) side, respectively, of corresponding
pages similar to the page spreads 68b-68c and 68h-68j shown in
FIGS. 4B-4F.
[0041] The book 60 further comprises a plurality of page
identifiers 82a-82o which are integral in the book 60. Each page
identifier is uniquely associated with a corresponding page spread.
Each page spread is uniquely encoded so as to be readable by an
optical sensor system beneath the book 60. The spreads are encoded
by the provision or absence of holes at predetermined location in
the spreads, which overlie individual sensors of a sensor system
under the book 60. Each page identifier comprises a series of
overlayable arrangements of open or closed potential hole locations
(hereinafter simply "hole locations"). In a preferred embodiment,
the hole locations are positioned within an upper margin of each
page to physically lie over the sensors 122a-122o. Alternatively,
the hole locations may be positioned within other portions of each
page and the sensors repositioned accordingly. As will become
apparent form the discussion below, the number of hole locations
required for page identifier encoding is dependent on the number of
page spreads to be identified and in the preferred encoding scheme
is less than half the number of page spreads.
[0042] In the illustrated embodiment, book 60 has fifteen page
spreads, identified by reference numerals, collectively by 82 and
82a-82o for individual spreads. Each page is provided with seven
hole locations. The first page spread 68a and the fifteenth page
spread 68o correspond to the closed book 60 lying on its back cover
and its front cover, respectively, and thus are formed by a single
page each having seven hole locations. The page spreads between the
first page spread 68a and the fifteenth page spread 68o are
two-page spreads and therefore have fourteen hole locations
indicated by reference numerals, collectively by 72 and
individually at 72a through 72n (FIG. 2).
[0043] Each hole location is either an open-hole location 74, or a
closed-hole location 76. Optionally, one or more of the closed-hole
locations 76 may have a foil 77 with an optical reflectance
detectably different than the optical reflectance of an area
adjacent the closed-hole location.
[0044] Again, FIGS. 4A-4G depict top plan views of some of the
spreads as seen by the user rather than the sensor. A first page
identifier 82a corresponds to the first page spread 68a (FIG. 4A).
The first page identifier 82a is an encoding formed by seven of
fourteen possible hole locations (eighth through fourteenth hole
locations, 72h though 72n, in the first side 64a of the first page
62a), which are closed. A closed location will reflect light from
the emitter 124 of each sensor 122 so as to be detected by the
detector 126 of each sensor pair 124/126. A hole or no page over
the sensor will not reflect light and will not register on the
sensor 122. As will be discussed shortly, various hole locations
72a-72o are eventually closed or covered. Preferably a metallic
foil 77 is used to close a hole location facing open holes in pages
68 adjoining and facing the closed hole to better reflect light
from a facing emitter 124 and raise the signal level from the
detector 126 sensing the closed hole/foil. The eighth through
thirteenth hole locations 72h through 72m are locations of one or
more open-holes 74. These overlying foils 77 (represented by a
darkened hole location) disposed on closed-hole locations 76 that
are located on successive pages beneath the topmost first page 62a.
As will be discussed, these open hole 74 and closed hole 77
locations are in accordance with the scheme in FIG. 5, as further
discussed below. The fourteenth hole location 72n is a closed-hole
76 covered by a foil 77.
[0045] To summarize FIG. 4A, a user looking down at a closed book
60 on the right-hand side 26 of the device 20 is presented with
seven potential hole locations 72h through 72n. The user sees a
foil 77 in each location with a series of open holes overlying each
foil 77 that decrease in number from left to right (72h to 72n)
across the book 60. As will be discussed below, this arrangement
occurs because each of the first seven pages 62a-62g has one foil
77 closed hole and one less open hole 76 than the page above it
(i.e. previous page).
[0046] The encoding for the first page identifier 82a (FIG. 4A) is
best understood in conjunction with the hole location status
tabulation of FIG. 5 in which open-hole locations 74 are indicated
by the letter "O", closed-hole locations 76 without a foil 77 are
indicated by the letter "C", and closed-hole locations 76 with a
foil 77 are indicated by the letter "F". (It should be understood
that on some other page underlying each open hole location 74 is a
foil 77.) For example, the hole location status tabulation in FIG.
5 shows that a foil 77 is present at the eighth hole location 72h
of the first page spread 68a on the underlying seventh page 68g.
The foil 77 is visible in a top plan view of the book 60 in page
spread 68a because an open hole is provided at the eighth hole
location 72h in each of the first through sixth pages (68a through
68f) overlying the seventh page 68g. Thus, as stated above, the
first page (or front cover) 62a of the book 60 comprises six
open-hole locations 74 (for eighth through thirteenth hole
locations, 72h through 72m) below each of which is a foil 77 at a
successive closed hole location 76 on the successive corresponding
underlying pages. The first page 62a further has only one
closed-hole location 76 with a foil 77 in the fourteenth hole
location 72n.
[0047] Referring to FIG. 4B and FIG. 5, a second page identifier
82b corresponds to the second page spread 68b. The second page
spread 68b is a two-page spread. Accordingly, the second page
identifier 82b is encoded by fourteen hole locations. The first
through seventh hole locations, 72a through 72g, are located in the
upper margin of the second side 64b of the first page 62a. These
hole locations are in mirror image registry with the hole
locations, 72h through 72n, on the first side 64a of the first page
62a (FIG. 4A), and have in reverse order the same open-hole and
closed-hole encoding as the first side 64a of the first page 62a.
The only difference is that the first closed-hole location 72a of
the second page identifier 82b does not have a foil 77 as does the
corresponding fourteenth closed-hole location 72n on the first side
64a of the first page 62a. This is a result of the method of
fabrication of the book 60. A foil 77 could have been visibly
mounted in the first hole location 72a of the second spread 68b.
Indeed, any and every closed (C) location in FIG. 5 could be a foil
(F) location and vice versa. The eighth through fourteenth hole
locations, 72h though 72n, are located in the upper margin of the
first side 64a of the second page 62b. The eighth through twelfth
hole locations, 72h through 72l, are open-hole locations 74 in that
page 62b. The thirteenth and fourteenth hole locations 72m, 72n are
closed-hole locations 76. The thirteenth hole location 72m has a
foil 77. The portion of the encoding for the second page identifier
82b on the first side 62a of the second page 62b has one less
open-hole location 74 than the encoding for the first page
identifier 82a on the first side 64a of the first page 62a.
[0048] Referring to FIG. 4C and FIG. 5, a third page identifier 82c
corresponds to the third page spread 68c. The third page spread 68c
also is a two-page spread. Accordingly, the third page identifier
82c is encoded by fourteen hole locations. The first through
seventh hole locations, 72a through 72g, are located in the upper
margin of the second side 64b of the second page 62b, are in mirror
image registry with the hole locations 72h though 72, on the first
side 64a of the second page 62b, and have, in reverse order, the
same open-hole and closed-hole encoding as the first side 64a of
the second page 62b. The closed-hole location 72b of the third page
identifier 82c does not have a foil 77. The eighth through
fourteenth hole locations, 72h though 72n, are located in the upper
margin of the first side 64a of the third page 62c. The eighth
through eleventh hole locations, 72h through 72k, are open-hole
locations 74 in the page 62c. The twelfth, thirteenth and
fourteenth hole locations 72l, 72m, 72n are closed-hole locations
76 in the page 62c. The twelfth hole location 72l has a foil 77.
The portion of the encoding for the third page identifier 82c on
the first side 64a of the third page 62c has one less open-hole
location than the encoding for the second page identifier 82a on
the first side 64a of the second page 62b.
[0049] For brevity, the fourth through seventh page spreads for the
book 60 are not shown, as those skilled in the art will understand
from the encoding of the fourth through seventh page identifiers,
82d through 82g, shown in FIG. 5, that the encoding for each
successive page identifier decreases in a total number of open-hole
locations by at least one open-hole location and that the location
of the foil shifts inwardly one hole position for each page
68d-68g.
[0050] Referring to FIG. 4D and FIG. 5, an eighth page identifier
82h corresponds to the eighth page spread 68h. The eighth page
spread 68h is a two-page spread having the eighth page spread
identifier 82h encoded by fourteen hole locations, each of which is
a closed-hole location 76. Those skilled in the art will understand
that the eighth page spread 68h is a separator page that partitions
the encoding scheme of the present invention into a first sequence
of page identifiers comprising an overlayable arrangement of
open-hole and closed-hole locations in which each successive
arrangement of the first sequence decreases in a first total number
of open-hole locations by at least one open-hole location, as
discussed above, and a second sequence of page identifiers
comprising overlayable arrangements of open-hole and closed-hole
locations in which each successive arrangement of the second
sequence increases in a second total number of open-hole locations
by at least one open-hole location, as discussed below.
[0051] Referring to FIG. 4E and FIG. 5, a ninth page identifier 82i
corresponds to the ninth page spread 68i. The ninth page spread 68i
is a two-page spread. Accordingly, the ninth page identifier 82i is
encoded by fourteen hole locations. The first through seventh hole
locations, 72a through 72g, are located in the upper margin of the
second side 64b of the eighth page 62h, are in mirror image
registry with the hole locations, 72h though 72n, on the first side
64a of the eighth page 62h, and are all closed-hole locations 76.
The seventh hole location 72g is a closed-hole location 76 with a
foil 77. The eighth through fourteenth hole locations, 72h though
72n, are located in the upper margin of the first side 64a of the
ninth page 62i. The eighth hole location 72h is an open-hole
location 74. The ninth through fourteenth hole locations, 72i
through 72n, are closed-hole locations 76. The portion of the
encoding for the ninth page identifier 82i on the first side 62a of
the ninth page 62i has one more open-hole location 74 (at 72h) than
does the encoding for the eighth page identifier 82h on the first
side 64a of the eighth page 62h (FIG. 4D).
[0052] Referring to FIG. 4F and FIG. 5, a tenth page identifier 82j
corresponds to the tenth page spread 68j. The tenth page spread 68j
also is a two-page spread. Accordingly, the tenth page identifier
82j is encoded by fourteen hole locations. The first through
seventh hole locations, 72a through 72g, are located in the upper
margin of the second side 64b of the ninth page 62i, are in mirror
image registry with the hole locations, 72a though 72g, on the
first side 64a of the ninth page 62i (FIG. 4E), and have in reverse
order the same open-hole and closed-hole encoding as the first side
64a of the ninth page 62i. The sixth hole location 72f of the tenth
page identifier 82j is a closed hole-location 76 with a foil 77.
The eighth through fourteenth hole locations, 72h though 72n, are
located in the upper margin of the first side 64a of the tenth page
62j. The eighth and ninth hole location 72h, 72i are open-hole
locations 74. The tenth through fourteenth hole locations, 72j
through 72n, are closed-hole locations 76. The portion of the
encoding for the tenth page identifier 82j on the first side 62a of
the tenth page 62j has one more open-hole location 74 than the
encoding for the ninth page identifier 82i on the first side 64a of
the ninth page 62i (FIG. 4E).
[0053] For brevity, the eleventh through thirteenth page spreads
for the book 60 are not shown, as those skilled in the art will
understand from the encoding of the eighth through tenth page
identifiers, 82h through 82j, shown in FIG. 5, that the encoding
for each successive page identifier increases in a total number of
open-hole locations by at least one open-hole location. Also for
brevity, the fifteenth page identifier 82o (FIG. 4G) corresponding
to the fifteenth page spread 68o has in reverse order substantially
the same encoding as the first page identifier 82a and is not
further discussed.
[0054] With reference again to FIG. 5, the preferred embodiment of
the book 60 comprises a first (or front cover) page spread 68a
formed by the first side 64a of the first page 62a, a fifteenth (or
back cover) page spread 68o formed by the second side 64b of the
fourteenth page 62n, and a plurality of successive page spreads
68b-68n therebetween. Preferably, the plurality of page spreads
68b-68n are formed by a first (right or odd numbered) side of a
first corresponding page and a second (left or even numbered) side
64b of a second corresponding page, such as the first side 64a of
the second page 62b and the second side 64b of the first page 62a
forming the second page spread 68b shown in FIG. 2.
[0055] Stated another way, the book 60 additionally comprises a
first sequence 78 of page identifiers 82b-82h (see FIG. 5). Each
page identifier 82b-82h is associated with a first corresponding
page spread 68b-68h of the plurality of successive page spreads.
The first sequence 78 comprises overlayable arrangements of
open-hole and closed-hole locations 74(0), 76(F/C), respectively.
Each successive arrangement of the first sequence 78 decreases in a
first total number of open-hole locations by at least one open-hole
location 74. For example, as shown in FIG. 5, for the encoding of
the first sequence 78 of page identifiers 82b-82h for a
fourteen-page book, the first total number of open-hole locations
74 decreases by two open-hole locations 74 for successive
arrangements corresponding to the page identifiers 82b-82g
associated with the second through seventh page spreads 68b-68g and
by one open-hole location 74 for the succession from the seventh
page spread 68g to the eighth page spread 68h.
[0056] Those skilled in the art will understand from the encoding
scheme shown in FIG. 5 that each arrangement of the first sequence
of page identifiers has at least one closed-hole location on the
first side 64a of the first corresponding page of the first
corresponding page spread. The at least one closed-hole location
has a first optical reflectance detectably different than a second
optical reflectance of a first area adjacent the at least one
closed-hole location when provided with a foil 77 in the hole
location.
[0057] The book 60 additionally comprises a second sequence 80 of
page identifiers 82h-82n. Each page identifier 82h-82n is
associated with a second corresponding page spread 68h-68n of the
plurality of successive page spreads. The second sequence 80
comprises overlayable arrangements of open-hole and closed-hole
locations 74, 76, respectively. Each successive arrangement of the
second sequence 80 increases in a second total number of open-hole
locations by at least one open-hole location 74. For example, as
shown in FIG. 5, for the encoding of the second sequence 80 of page
identifiers 82h-82n for a fourteen-page book, the second total
number of open-hole locations 74 increases by one open-hole
location 74 for the succession from the eighth page spread 68h to
the ninth page spread 68i and by two open-hole locations 74 for
successive arrangements corresponding to the page identifiers
82i-82n associated with the ninth through fourteenth page spreads
68i-68n.
[0058] Those skilled in the art will understand from the encoding
scheme shown in FIGS. 4A-5 that each arrangement of the second
sequence 80 of page identifiers has at least one closed-hole
location on the second side 64b of the second corresponding page of
the second corresponding page spread. The at least one closed-hole
location has a third optical reflectance detectably different than
a fourth optical reflectance of a second area adjacent the at least
one closed-hole location. The artisan also will understand from the
discussion above that the difference in optical reflectance
detectability can by achieved by positioning of the foil 77 or
other reflective material at the corresponding one closed-hole
location (72g-72a in sequence 80). Accordingly, the first and third
optical reflectances can be substantially the same. Similarly, the
second and fourth optical reflectances can be substantially the
same without departing from the spirit and scope of the invention.
Still further, the artisan will understand from the discussion
below that the materials or surface treatments provided at the
closed-hole locations and in the adjacent areas can be any
combination of materials or surface treatments having the optical
reflectance properties required to obtain a desired signal to noise
ratio for the optical sensors, also discussed below.
[0059] In use, the electronic learning device 20 is activated using
the on/off switch 34, the cartridge 50 is coupled to the electronic
learning device 20, the book 60 is placed in the book well 32. The
integrated sensor system 100 operates as subsequently
described.
[0060] The signal oscillator circuit 132 generates a square wave
signal having a frequency of approximately 250 kHz at 3.3 V to the
column driver circuit 134. Corresponding pairs of the vertical
column conducting lines of the position sensor matrices 112, 114
are excited sequentially from one through sixteen with the square
wave signal. The horizontal row conducting lines of each of the
matrices 112, 114 are scanned sequentially from one through sixteen
during each excitation of one vertical column line. In this manner,
each cross-point of the sensor matrices 112, 114 is measured
individually. The row select circuit 152 directs the sequential
sensing of the sensor circuits 144, 146. The sensor circuits 144,
146 detect signals on the row lines of the sensor matrices 112, 114
and forward the detected signals to the synchronous detector,
multiplexer and filter 150. Thereafter, the detected signals are
converted to digital signals by the A/D converter 154 and forwarded
to the controller 42 for analysis.
[0061] The measured values of each cross-point are stored in a
memory 44 operatively coupled to the controller 42. When a finger
or hand is present over the sensor matrices 112, 114, the value of
signals received by the sensor circuits 144, 146 is reduced at the
location of the finger or hand over individual cross-points. By
comparing successive full scans of the sensor matrices 112, 114 for
the presence of a finger, the precise location of the finger can be
determined.
[0062] The optical emitter and detector circuits 136, 138, 140 and
142 are integrated with the circuitry controlling the successive
full scans of the sensor matrices 112 and 114 discussed above in
the following manner. Control and synchronization of the optical
emitter and detector circuits 136, 138, 140 and 142 with the
scanning circuits for the sensor matrices 112, 114 is accomplished
by the optical switch and gate 148 under the control of the
controller 42. The optical switch and gate 148 enables and disables
the row select circuit 152 to allow isolation and independent
control of the optical emitter and detector circuits 136, 138, 140
and 142 and the row select circuit 152. Preferably, but not
necessarily, the optical emitter and detector circuits 136, 138,
140 and 142 are activated after each full scan of the sensor
matrices 112 and 114.
[0063] Status of the emitter-detector pairs 122 corresponding to
first through fourteenth hole locations 72a through 72n of each
book 60 is communicated to the controller 42 and decoded by the
controller in accordance with a decoding table located in the
memory 44 to determine which page spread is visible to the user.
For example, the page identifiers for the page spreads for the
preferred embodiment of the book 60 discussed above and coded in
accordance with the encoding shown in FIGS. 4A-4G and FIG. 5 appear
to the emitter-detector pairs 122 as shown in FIG. 6A-6G when the
book 62 is in the book well 32 and are decoded by the controller 42
in accordance with the decoding table shown in FIG. 7. FIGS. 6A-6G
represent bottom plan views of the book 60, as seen by the optical
detectors 126a-126n associated with optical sensors 122a-122n,
respectively, and are nearly mirror images of FIGS. 4A-4G. The
major difference is that foils are visible to the detectors where
simple closed hole locations (C) are visible to the user (FIGS.
4A-4G).
[0064] From this disclosure, the artisan will recognize that in
addition to the above-described encoding of page identifiers, other
page identifiers associated with a supplemental book (not
illustrated) having, for example, additional page spreads, may be
encoded by arrangements of the open-hole locations 74 and
closed-hole locations 76 not used in the first through fifteenth
page spreads. For example, with reference to FIG. 7, part of a
third sequence 84 of page spreads and corresponding page
identifiers having open-hole 74 and closed-hole 76 status as shown
can be provided. The page identifiers associated with the third
sequence 84 can be detected with the optical sensor 120 in a manner
consistent with operation of the first and second sequences page
identifiers 78 and 80 described above. Other unique page
identifiers in addition to those associated with the first, second
and third sequences 78, 80 and 82 are possible. These separate
sequences can be used in separate books and data for books having
different sequences 78, 80, 84, etc. can be stored in the same
cartridge 50.
[0065] Once the electronic learning system 10 has determined which
page spread is viewable by the user, the electronic learning device
20 may initiate an interactive play or learning activity with the
user. For example, the electronic learning device 20 may prompt the
user to identify a particular graphic image by touching the graphic
image with his or her finger. The position sensor 110 allows the
electronic learning device 20 to recognize the user's response, and
respond in an appropriate manner, for example, with an audible
response. The user may proceed to turn the book 60 to another page
spread and continue the interactive play or learning experience.
Preferably, each individual page spread has graphic images relating
to a separate theme, and the queries and responses generated by the
electronic learning system 10 correspond to the individual page
spread visible to the user. Therefore, a large number of queries
and responses corresponding to the plurality of page spreads is
possible. Accordingly, the electronic learning system 10 is capable
of providing a wide range of play and learning scenarios. From this
disclosure, the artisan will recognize that multiple books 60 and
corresponding cartridges 50, each directed to a different theme or
character, could be provided to further expand the range of play
and learning activity possible with the electronic learning system
10.
[0066] The electronic learning system 10 preferably includes
multiple functional modes selectable using the position sensor 110.
For example, in a first functional mode, the electronic learning
system 10 may simple recite a story corresponding to written words
disposed on the page or pages of the page spread visible to the
user. From this disclosure, the artisan will recognize that other
functional modes, for example modes designed to teach words,
phonics, spelling and/or counting skills could be provided. The
displays 40 may be used to indicate in which functional mode the
electronic learning device 20 is operating. Further description of
the functional modes may be found in co-pending U.S. patent
application Ser. No. 10/448,583.
[0067] The electronic learning device 20 is preferably capable of
audibilizing sound passages without the cartridge 50 inserted into
the housing 22 or the book 60 inserted into the book well 32. In a
preferred embodiment, a plurality of indicia (not illustrated)
corresponding to the English alphabet are disposed on an upper
surface of the book well 32. With the electronic learning device 20
turned on, and the cartridge 50 and book 60 removed from the base
unit 20, the controller 42 can be configured to respond to a user
pressing on the book well 32 to select data corresponding to a
sound passage from the base unit memory 44 and to further
audibilize the sound passage via the speaker 38. The sound passage
might be the name of a letter of the alphabet which the user has
just pressed. Alternatively, the sound passage might be a musical
note, a series of musical notes, or one or more spoken words.
[0068] From this disclosure, the artisan will recognize that the
form of the open holes 74 and closed holes 76 is not limited to the
form illustrated in FIGS. 2, 4A-4G and 6. Open holes may or may not
have a closed perimeter as do the open holes 74 or be individual at
each hole location as are the open holes 74 in the first embodiment
book 60. With reference now to FIG. 9, a first alternative book 60'
is illustrated, showing an upper portion of the second page spread
68b. The inventive concepts illustrated in FIG. 9 are not limited
to the second page spread 68b, but apply to each of the plurality
of page spreads. In the first alternative book 60', as is most
readily apparent relative with the first page 62a, an elongated
open perimeter hole in the form of a cutout 75 elongated proximal a
free (upper) edge of the page 62a is made spanning all of the
adjacent locations of open holes 74 in the same page of the first
embodiment book 60 of FIG. 4B (that is hole locations 72b through
72g). Furthermore, the elongated hole could be provided in the form
of an elongated slot with a closed perimeter as is indicated in
phantom at 75' in FIG. 9. The artisan will recognize that the
elongated hole, cutout 75 or slot 75', is operationally equivalent
to the plurality of adjoining individual open holes 74 positioned
within the consecutive adjoining hole locations 72b through 72g, as
illustrated in FIG. 4B. That is, in operation, the emitter-detector
pairs 122 do not distinguish between a single open cutout 75 or
slot 75' spanning multiple adjacent open holes 74, for example hole
locations 72b-72g corresponding to page identifier 82b, and a
plurality of individual open holes 74 in those same hole locations
72b-72g.
[0069] FIG. 9 further illustrates use of elongated openings such as
elongated cutouts 75 spanning multiple adjacent open hole locations
74 where multiple pages are stacked on top of one another. A first
cutout 75 in second page 62b spans hole locations 72h-72l. A second
cutout 75 in third page 62 spans hole locations 72h-72k. A third
cutout 75 in fourth page 62d spans hole locations 72h-72j. In a
similar manner, a stair-step pattern is formed, with a cutout 75 in
seventh page 62g spanning only hole location 72h. Again, each of
these elongated cutouts could be replaced by elongated slots (not
depicted).
[0070] Finally, with reference now to FIG. 10, a second alternative
book 60'' is illustrated, showing an upper portion of the second
page spread 68b. As with FIG. 9, the inventive concepts illustrated
in FIG. 10 are not limited to the second page spread 68b, but apply
to each of the plurality of page spreads. In the second alternative
book 60'', an open hole location 74 is formed by an individual open
perimeter cutout 79 extending inwardly from a free edge (the top
edge) of a given page. In this second alternative book 60'' the
individual cutouts 79 have opposing straight walls extending to a
radiused innermost end.
[0071] The first and second alternate embodiment books 60' and 60''
of FIGS. 9 and 10 serve to illustrate the fundamental point that
the open hole locations 74 and closed hole locations 76 can assume
a variety of forms. An "open hole" simply indicates that for a
given page spread, there is an absence of the page at the open hole
location. Thus, when the book 60, 60', 60'' is in an operational
position (such as within the book well 32), no portion of the page
68 is positioned such that the emitter-detector pair 122 detects
page structure within its zone of detection. Similarly, a "closed
hole" indicates that when the book 60, 60', 60'' is in an
operational position (e.g. within the book well 32), a portion of
the relevant page of the book 60, 60', 60'' is positioned such that
the emitter-detector pair 122 detects the portion of the book/page
structure. Within these general constraints, the artisan will
recognize that many different arrangements of the open hole
locations 74 and closed hole locations 76 are possible. For
example, in addition to the alternative arrangements shown in FIGS.
9 and 10, the emitter-detectors pairs 122 and the corresponding
hole locations 72a-72n could be arranged proximate one of the other
free (i.e. non-hinged) edges, the side edges or bottom edge, of the
book 60, 60', 60'', or at some other position on the plurality of
pages, rather than proximate the top free edge. Furthermore, the
page identifier codes could be formed by a combination of multiple
alternative forms of the open hole locations and closed hole
locations, for example, a combination of the closed perimeter holes
74 of book 60, the open-perimeter cutouts 75 or closed-perimeter
slots 75' of the first alternative book 60' and/or the
open-perimeter cutouts 79 of the second alternative book 60''.
Operation of the electronic learning system 10 is similar
regardless of the exact form of the open hole locations 74 and
closed hole locations 76.
[0072] From the foregoing it can be seen that the present invention
is an electronic learning device capable of receiving a book having
a plurality of page spreads, each page spread having a unique page
identifier code. The electronic learning device includes an optical
page identification system capable of autonomously identifying each
page spread without requiring intervention by the user.
[0073] It will be appreciated by those skilled in the art that
changes could be made to the embodiments described above without
departing from the broad inventive concept thereof. It is
understood, therefore, that this invention is not limited to the
particular embodiments disclosed, but it is intended to cover
modifications within the spirit and scope of the present invention
as defined by the appended claims.
[0074] All references, patent applications, and patents mentioned
above are incorporated herein by reference in their entirety and
are not to be construed as an admission that any of the of the
cited documents constitutes prior art, or as an admission against
interest in any manner.
* * * * *