U.S. patent application number 10/685841 was filed with the patent office on 2005-04-21 for induction antenna loop for low-level digital tablets.
Invention is credited to Lin, Shun Bin, Uen, Tzong Wei.
Application Number | 20050083237 10/685841 |
Document ID | / |
Family ID | 34423216 |
Filed Date | 2005-04-21 |
United States Patent
Application |
20050083237 |
Kind Code |
A1 |
Uen, Tzong Wei ; et
al. |
April 21, 2005 |
INDUCTION ANTENNA LOOP FOR LOW-LEVEL DIGITAL TABLETS
Abstract
The present invention provides an antenna loop and its layout
for low-level digital tablets. The antenna loop for low-level
digital tablets in the present invention consists of enameled wire;
the layout comprises a single antenna loop consisting of enameled
wire. Each antenna loop comprises a plurality of close circles.
Furthermore, the circles of odd ordinal numbers comprise odd
sections, for instance, the third circle comprises three sections;
the circles of even ordinal numbers comprise even sections, for
instance, the fourth circle comprises four sections; each section
comprises induction areas of substantially the same size.
Furthermore, the final section is an open section so that through
which the second terminal of the enameled wire loop can stretch out
and electrically couple with the ground wire.
Inventors: |
Uen, Tzong Wei; (Miao-Li
City, TW) ; Lin, Shun Bin; (Zhang-Hua Hsien,
TW) |
Correspondence
Address: |
RUBEN C. DELEON
WINSTEAD SECHROST & MINICK P.C.
P.O. BOX 50784
DALLAS
TX
75201
US
|
Family ID: |
34423216 |
Appl. No.: |
10/685841 |
Filed: |
October 15, 2003 |
Current U.S.
Class: |
343/742 ;
343/867 |
Current CPC
Class: |
G06F 3/046 20130101;
H01Q 7/00 20130101 |
Class at
Publication: |
343/742 ;
343/867 |
International
Class: |
H01Q 011/12 |
Claims
What is claimed is:
1. An induction antenna loop for low-level digital tablet, said
induction antenna loop comprising: an electromagnetic-induction
area; and an antenna loop having a plurality of circles in the form
of multi-circularly arrangements, said circles connect to each
other orderly to make the starting terminals of said plurality of
circles on the same side of said electromagnetic-induction area,
and said plurality of circles divide said electromagnetic area into
a plurality of sections that serve as a plurality of
electromagnetic-induction addresses.
2. The induction antenna loop for low-level digital tablet of claim
1, wherein said antenna loop is located in said
electromagnetic-induction area along each axis.
3. The induction antenna loop for low-level digital tablet of claim
1, wherein the material of said antenna loop is an enameled
wire.
4. The induction antenna loop for low-level digital tablet of claim
1, wherein the first terminal of said antenna loop is electrically
coupled with an antenna switch.
5. The induction antenna loop for low-level digital tablet of claim
1, wherein the second terminal of said antenna loop is electrically
connected with a ground wire.
6. The induction antenna loop for low-level digital tablet of claim
1, wherein said circles of odd ordinal number comprise odd said
sections, and said circles of even ordinal number comprise even
said sections.
7. The induction antenna loop for low-level digital tablet of claim
1, wherein said plurality of sections comprise induction areas of
substantially the same size.
8. The induction antenna loop for low-level digital tablet of claim
1, wherein all but the final one of said plurality of sections are
close sections, and the final one of said plurality of sections is
an open area so that through which said antenna loop can stretch
out and electrically couple with said ground wire.
9. An induction antenna loop for low-level digital tablets
comprising: an electromagnetic-induction area; and an antenna loop
consisting of enameled wire, said antenna loop comprises a
plurality of circles in the form of multi-circular arrangements,
and said circles connect to each other orderly so that the starting
terminals of said plurality of circles are located on the same side
of said electromagnetic-induction area, and said plurality of
circles divide said electromagnetic area into a plurality of
sections that serve as a plurality of electromagnetic-induction
addresses, further, said circles of odd ordinal number comprises
odd said sections and said circles of even ordinal number comprises
even said sections.
10. The induction antenna loop for low-level digital tablet of
claim 9, wherein said antenna loop is located in the
electromagnetic area along each axis.
11. The induction antenna loop for low-level digital tablet of
claim 9, wherein the first terminal of said antenna loop is
electrically coupled with an antenna switch
12. The induction antenna loop for low-level digital tablet of
claim 9, wherein the second terminal of said antenna loop is
electrically connected with said ground wire.
13. The induction antenna loop for low-level digital tablet of
claim 9, wherein said plurality of sections comprise induction
areas of substantially the same size.
14. The induction antenna loop for low-level digital tablet of
claim 9, wherein all but the final one of said plurality of
sections are close sections, and the final one of said plurality of
sections is an open area so that through which said antenna loop
can stretch out and electrically couple with said ground wire.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates generally to the antenna loops
in digital tablets, and more particularly, to a layout for antenna
loops in digital tablets.
[0003] 2. Description of the Prior Art
[0004] Usually, a handwriting recognition system is a device with
electromagnetic-induction. Conventional electromagnetic-induction
devices comprise, an electromagnetic pen and a tablet. There is an
oscillating circuit that consists of LC in the electromagnetic pen.
If the pen point is touched, the amount of inductance will be
changed, which results in a variation of oscillating frequency. The
amount of inductance is increased when touching the pen point and
increasing pressure so the variation of oscillating frequency is
also increased. Therefore, the variation of the pressure on the pen
point can be detected by way of the variation of oscillating
frequency. There are two switches on the sidewall of the
electromagnetic pen, the emitted frequency of the electromagnetic
pen can be changed with the capacitance variation of the LC device
that is produced by pushing down or setting free the switches.
Furthermore, the tablet comprises a detector, an amplifier and an
analog-digital converter. In the conventional tablet, there is a
detected loop in the center region of the tablet, with antenna
loops located on the double faces of the detecting loop, wherein
the antenna loops are equidistantly arranged in order by using an
array. The main purpose of the detecting loop is only applied to
receive the electromagnetic wave that is emitted by the
electromagnetic pen. When the electromagnetic pen emits the
electromagnetic wave, the antenna loops receive the electromagnetic
wave, and then the tablet can obtain correlative information by the
electromagnetic induction.
[0005] In general, antenna loops and layout thereof in the
conventional electromagnetic-induction device arranges antennas as
check network that are distributed with equidistance in the
X-direction and Y-direction of two-dimensional Cartesian
coordinates to induce the electromagnetic pen and calculate the
absolute position thereof. Referring to FIG. 1, it shows a layout
for antenna loops distributed in the X-direction of two-dimensional
Cartesian coordinates, wherein one terminal of each of the antenna
loops 110A is connected to each switch (X1 to X6), whereby the
reduced signal of each of the antenna loops 110A can be detected by
controlling the switches X1 to X6). Because of the inverse
proportion of the magnetic fields intensity to the square of
distance, the electromagnetic pen that emits an electromagnetic
wave is at a distance from the tablet, resulting in a weak induced
signal received by antenna loops. On the contrary, the induced
signal that is received by antenna loops has an increased number of
intensity when the electromagnetic pen approaches the tablet.
Therefore, the CPU of the tablet scans one by one and in turn each
of the antenna loops to analyze intensity of induced signals that
are received by each antenna loops, so as to detect the position
where the cordless pen is located and calculate the coordinates
thereof.
[0006] However, there is an increasing number of antenna loops in
the tablet having a much larger area so a great amount of antenna
switches are necessary. In a conventional method, it is necessary
to notice that the distance between two adjacent logical sections
in the same physical antenna loop must be adequate. If the distance
is too small, it is possible to make a misjudgment in deciding the
position of the electromagnetic pen. On the other hand, nowadays,
digital products are developed toward the aspect of high speeds for
processing information, which is a result of electromagnetic
interference. Generally, there are various digital products around
the specific place for using the digital tablet. In terms of the
digital tablets with bigger areas that are commercially required,
the amount of switches and antenna loops in the digitizer tablets
of the prior art is increased accordingly. Therefore, the method
that increases amount of n-shaped sections in the same antenna loop
is provided to decrease a great amount of antenna switches. Here
the method increases length of the antenna loop so as to generate
electromagnetic noise, that is, it is easy to be interfer with the
electromagnetic noise, and that affects the calculation of the
position of the pen that is located on the digital tablet.
Furthermore, conventional layouts of antenna loops set limitations
on scaling down the area of handwriting tablets, which results in
difficulty in manufacturing panels with small boundary regions.
Conventional layouts of antenna loops are formed on Printed Circuit
Boards (PCB) through various semiconductor manufacturing processes
(such as lithography and etch), for products with low need for high
delicacy for layouts of antenna loops, such as children scribbling
panels, audible books, . . . etc, although conventional layouts of
antenna loops formed by the printed circuit boards process are
advantageous in position detection, the cost is too high. In
accordance with the above description, a new layout for
multi-antenna loops in the digital tablet is therefore necessary,
so as to solve the problems mentioned from the foregoing
description.
SUMMARY OF THE INVENTION
[0007] In accordance with the present invention, a new layout for
antenna loops in digital tablets is provided, which substantially
overcomes the drawbacks of above problems mentioned from the
conventional systems.
[0008] It is an object of the present invention to provide a layout
for antenna loops in low-level digital tablets. The present
invention is an induction antenna loop formed by an enameled wire
loop instead of conventional PCB, and an electromagnetic induction
interface is formed by circular arrangements of the enameled wire
loop. The enameled wire process of antenna loops used in the
present invention needs not delicate equipment, which reduces the
cost and complexity of the manufacturing process. Furthermore,
another object of the present invention is to provide an antenna
loop used for low-level digital tablets. The present invention can
form the layout of an antenna loop with single enameled wire loop,
wherein the single enameled wire loop is used to form a coordinate
with a plurality of sections. This method is served to replace the
conventional multi-antenna layout and reduce the number of
switches. Therefore, the present invention corresponds to economic
effect and utilization in industry.
[0009] Accordingly, it is an object of the present invention to
provide a layout for antenna loops in low-level digital tablets.
The material used in the present invention is enameled wire, and
the layout comprises: locating single antenna loop formed by
enameled wire along each axis, wherein the first terminals of each
single antenna loop located along each axis are electrically
coupled with an antenna switch, and the second terminals are
electrically connected with a ground wire. Each of the antenna
loops has a plurality of sections formed by circularly arranging
the enameled wire; the enameled wire circles connect to each other
orderly so that all the starting-terminals of each circle assemble
in the starting-area of the whole enameled wire loop, wherein the
starting-area of the whole enameled loop is an area into which the
first terminal of the enameled wire loop electrically coupled with
the antenna switch stretch. Furthermore, the circles of odd ordinal
numbers comprise odd sections, for instance, the third circle
comprises three sections; the circles of even ordinal numbers
comprise even sections, for instance, the fourth circle comprises
four sections. The final section is an open section so that through
which the second terminal of the enameled wire loop can stretch out
and electrically couple with the ground wire.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is a schematic diagram illustrating the prior art in
the layout for antennas loop in digital tablets; and
[0011] FIG. 2 is a schematic diagram illustrating the layout for an
antenna loop for low-level digital tablet constructed in accordance
with one preferred embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0012] The present invention is related to a layout for antenna
loops in low-level digital tablets. Preferred embodiments of the
present invention will now be described in greater detail.
Nevertheless, it should be recognized that the present invention
can be practiced in a wide range of other embodiments besides those
explicitly described, and the scope of the present invention is
expressly not limited except as specified in the accompanying
claims.
[0013] Reference is now made to FIG. 2, in one embodiment of the
present invention, an electromagnetic-induction area 200 comprising
a single antenna loop 210 located along each axis is provide; the
single antenna loop 210 consists of enameled wire, and comprises a
first terminal 210A electrically coupled with an antenna switch
220, and a second terminal 210B electrically connected with a
ground wire 230. Each antenna loop 210 comprises a plurality of
circles 240 formed by circularly arranging the enameled wire loop,
and the circles 240 connect to each other orderly so that all the
starting-terminals of each circle 240 assemble in the starting-area
200A of the whole enameled wire loop on the same side of the
electromagnetic-induction area 200, wherein the starting-area 200A
of the whole enameled loop is an area into which the first terminal
210A of the enameled wire loop electrically coupled with antenna
switch 220 stretch. The plurality of circles 240 divide the whole
electromagnetic-induction area 200 into a plurality of sections 250
that serve as a plurality of electromagnetic-induction addresses.
The circles 240A, 240C and 240E of odd ordinal numbers comprise odd
sections, for instance, the third circle 240C comprises three
sections 250A, 250B and 250C; the circles 240B, 240D and 240F of
even ordinal numbers comprise even sections, for instance, the
fourth circle 240D comprises four sections 250A, 250B, 250C and
250D; the induction areas of each section 250A-E are of
substantially the same sizes. Furthermore, sections 250A-E are
close area, but the final section 250F is an open area so that
through which the second terminal 210B of the enameled wire loop
can stretch out and electrically couple with the ground wire 230.
Furthermore, the profile of the plurality of circles 240 from the
single antenna loop 210 can be formed with various shapes, such as
circle-shaped, elliptic-shaped, square-shaped, rectangle-shaped . .
. etc.
[0014] As mentioned above, the present invention is an induction
antenna loop formed by an enameled wire loop instead of
conventional PCB, and an electromagnetic induction interface is
formed by circularly arranging the enameled wire loop. The enameled
wire process of the antenna loop used in the present invention
needs not delicate equipment, which reduce the cost and complexity
of the manufacturing process. Furthermore, another object of the
present invention is to provide an antenna loop for low-level
digital tablets. The present invention can form the layout of an
antenna loop with single enameled wire loop, wherein the single
enameled wire loop is used to form a coordinate with a plurality of
sections. This method is served to replace the conventional
multi-antenna layout and reduce the number of switches. Therefore,
the present invention corresponds to economic effect and
utilization in industry.
[0015] Of course, it is possible to apply the present invention to
the antenna loops in the digital tablets, and to any apparatus with
layout of antenna loops.
[0016] Obviously, many modifications and variations of the present
invention are possible in light of the above teachings. It is
therefore to be understood that within the scope of the appended
claims, the present invention may be practiced otherwise than as
specifically described herein. Although specific embodiments have
been illustrated and described, it will be obvious to those skilled
in the art that various modifications may be made without departing
from what is intended to be limited solely by the appended
claims.
* * * * *