U.S. patent number 3,928,959 [Application Number 05/432,721] was granted by the patent office on 1975-12-30 for electronic timepiece.
This patent grant is currently assigned to Kabushiki Kaisha Seikosha. Invention is credited to Okito Naito.
United States Patent |
3,928,959 |
Naito |
December 30, 1975 |
**Please see images for:
( Certificate of Correction ) ** |
Electronic timepiece
Abstract
An electronic timepiece having a digital display for displaying
time in response to timekeeping signals applied thereto is
provided. A time correcting circuit including a manually operated
switch is coupled to an electronic divider circuit which supplies
the timekeeping signals to the display to correct the count therein
corresponding to at least one displayed digit of time. When the
switch is displaced momentarily a first correction signal is
provided which corrects the displayed digit by indexing the digit
by one and when the switch is displaced for a sustained period of
time a second correction signal is applied to the electronic
divider circuit to thereby correct the same digit by repetitively
indexing said digit.
Inventors: |
Naito; Okito (Suwa,
JA) |
Assignee: |
Kabushiki Kaisha Seikosha
(Tokyo, JA)
|
Family
ID: |
11624068 |
Appl.
No.: |
05/432,721 |
Filed: |
January 11, 1974 |
Foreign Application Priority Data
|
|
|
|
|
Jan 12, 1973 [JA] |
|
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48-5911 |
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Current U.S.
Class: |
368/188;
968/916 |
Current CPC
Class: |
G04G
5/043 (20130101) |
Current International
Class: |
G04G
5/00 (20060101); G04G 5/04 (20060101); G04C
003/00 () |
Field of
Search: |
;58/23R,5R,85.5 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Hix; L. T.
Assistant Examiner: Weldon; U.
Attorney, Agent or Firm: Blum, Moscovitz, Friedman &
Kaplan
Claims
What is claimed is:
1. An electronic timepiece having a multi-digital display and
comprising oscillator means for generating a relatively high
frequency time standard signal; an electronic divider means having
a plurality of stages coupled to said oscillator means and adapted
to supply low frequency signals to said digital display that are
representative of present time in response to said high frequency
time standard signal, an intermediate stage of said divider means
producing an intermediate frequency correction signal, correction
circuit means for receiving said intermediate frequency correction
signal from said intermediate stage of said electronic divider
means, means for producing an index correction signal including one
manually operated correction switch coupled to said correction
circuit means, said correction means applying said index correction
signal to a second divider stage associated with at least one
displayed digit of time to be corrected to index the count of said
stage by one when said switch is maintained in an operative
position for less than a predetermined interval, and to apply said
intermediate frequency correction signal to said second divider
stage when said switch is maintained in said position in excess of
said interval to repetitively index said digit.
2. An electronic timepiece having a digital display as claimed in
claim 1, wherein said manually operated switch is a two position
switch.
3. An electronic timepiece as claimed in claim 1, said index
correction signal producing means including at least one further
correction switch coupled to a third stage of said electronic
divider means for correcting the count of said third stage and
hence the one digit associated therewith by indexing said stage by
one.
4. An electronic timepiece as claimed in claim 1, wherein said
correcting circuit means includes a multi-stage flip-flop for
providing an interval signal which determines said interval in
response to a time coincident application of said intermediate
frequency correction signal and said switching signal, and gating
circuit means having applied thereto said interval signal, said
intermediate frequency correction signal and said switching signal,
said gating means being adapted to provide to said digit to be
corrected said intermediate frequency correcting signal in response
to the time coincident application of said interval determining
signal and said intermediate frequency correction signal and being
further adapted to provide said index correction signal being
applied in the absence of said interval signal at the input of said
gating circuit means.
5. An electronic timepiece as claimed in claim 4, wherein said
gating circuit means includes a flip-flop for providing a first and
second complementary output signal in response to the time
coincidental application of said switching signal and said interval
signal, output gate means for supplying said digit correction
signal to said digit to be corrected, the correction signals
applied thereto being inverted thereby, and first and second gating
means adapted to receive said first and second complementary output
signals respectively as a first input, said first gating means
being adapted to receive as a second input said intermediate
frequency correction signal and upon coincidence in the state of
said signals applied thereto applies said intermediate frequency
correction signal to said output gate means and said gating means
having as its other input said switching signal and upon
coincidence in state passing said index correcting signal to said
output gating means.
Description
BACKGROUND OF THE INVENTION
This invention relates generally to small-sized electronic
timepieces having digital displays and especially to an electronic
wristwatch having a correction circuit which is adapted to provide
two manners of correcting a single digit utilizing a single
switch.
Correction circuits in electronic timepieces wherein each digit is
displayed such as hours, minutes and seconds and wherein each digit
can be independently corrected are well known. In such timepieces
each digit is indexed by one to thereby change the time by
separately correcting hour, minute or second digits.
Still another type of correction mechanism in digital display
electronic timepieces, known as a quick-feed, is to provide a high
frequency signal to the divider circuit and advance each digit at a
multiple of its normal advancement rate. Another correction method
involves the correction of all digits except seconds, the seconds
digits being set to zero by a correction switch and restarted when
the switch is released at a reference time. Each of the above
mentioned methods of correction, while providing certain advantages
is less than completely satisfactory. For example, in an electronic
timepiece wherein each digit is independently corrected by indexing
same by one, if a minute is incorrect it might be necessary to
index the minute digit 59 times to obtain a corrected value.
Similarly when the quick-feed operation is utilized errors in
setting frequently occur due to the speed of indexing. Accordingly,
it is desired to provide an electronic timepiece having a digital
display which eliminates the above-mentioned disadvantages.
SUMMARY OF THE INVENTION
Generally speaking, in accordance with the invention, an electronic
wristwatch having an oscillator for producing a high frequency time
standard signal, an electronic divider circuit for receiving the
high frequency time standard signal and providing low frequency
timing signals, a digital display for displaying time in response
to such low frequency timing signals is provided. At least one
manually operated correcting switch associated with at least one
digit of time displayed is coupled through a correcting circuit to
an electronic divider circuit stage corresponding to the digit to
be corrected. The correcting circuit is further adapted to receive
the output signal of a divider stage of a higher frequency than the
frequency of the divider stage to be corrected. Displacement of
said correction switch indexes said corresponding divider stage to
correct the digit corresponding thereto by one. Sustained
displacement of the correcting switch for a certain period of time
effects a quick-feed correction of the digit by applying the high
frequency signal applied to the correcting circuit to the divider
stage corresponding to the digit to be corrected.
Accordingly, it is an object of this invention to provide an
improved digital display wristwatch wherein a single correction
switch provides two diverse type correcting operations of a single
digit.
Another object of this invention is to provide an improved digital
display electronic timepiece wherein the same swtich is used to
correct the time displayed by indexing same and/or quick-feeding
signals thereto.
Still another object of this invention is to provide an improved
electronic wristwatch having a digital display wherein correction
of a digit is effected in a highly practical manner.
Still other objects and advantages of the invention will in part be
obvious and will in part be apparent from the specification.
The invention accordingly comprises the features of construction,
combination of elements and arrangement of parts which will be
exemplified in the construction hereinafter set forth, and the
scope of the invention will be indicated in the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a circuit diagram of an electronic wristwatch including
the improved correction switch and circuit corresponding thereto
constructed in accordance with the instant invention;
FIG. 2 is a timing diagram of the correction signal applied by the
correcting circuit depicted in FIG. 1;
FIG. 3 is a circuit diagram of one embodiment of the correction
circuit depicted in FIG. 1; and
FIG. 4 is a timing diagram of the signals produced by the control
circuit depicted in FIG. 3.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to FIG. 1, an electronic timepiece having a
conventional digital display 2 for displaying numerals
representative of hours, minutes and seconds is depicted. Each
digit of the display may, by way of example, take the form of a
seven bar display. An oscillating circuit 1, which includes a
quartz crystal vibrator, is coupled to an electronic divider
circuit 3 for applying high frequency time standard signals
thereto. The electronic divider circuit 3 consists of a multi-stage
divider chain capable of counting seconds, minutes and hours and
producing, as an output, timing signals representative of present
time as reflected by the count in the respective divider stages.
The electronic divider circuit includes suitable decoder and
driving circuits so that the timing signals are capable of driving
display 2. The output of the electronic dividing and driving
circuit 3 is applied to digital display 2 which provides a digital
display of time.
A correcting circuit 7 consisting of a logic switching circuit
depicted in FIG. 3 is capable of being actuated by manually
operated switch 5 coupled thereto and is coupled to the divider
stage which counts minutes. The correcting circuit is further
coupled to another stage of the dividing and driving circuit 3 to
receive a signal having a higher frequency, 8 Hz, than the minute
signal. Manually operated correction switches 4, 5 and 6, provided
for the correction of hours, minutes and seconds respectively, are
two position switches which are spring biased to be open in normal
operation. The common terminal of hour correction switch 4 and
second correction switch 6 are coupled to the respective divider
stages for counting such digits. Minute correction switch 5 is
coupled through correction circuit 7 which couples said minute
correcting switch 5 to the minute divider in the manner hereinabove
described. Correction of hours, minutes and seconds may be achieved
by indexing the count of the associated divider stages by one upon
a closing of the manually operated switches 4, 5 and 6. Further, if
switch 5 is maintained in a closed position for more than 2
seconds, the correcting circuit applies the 8 Hz signal from the
higher frequency stage to the minute divider stage in order to
rapidly advance same. Thus, the correcting circuit 7 is changed
over to apply an 8 Hz signal and the minute digit is more rapidly
indexed until the correct digit is displayed, at which time the
switch 5 would be opened to thereby terminate correction of the
digit. It is appreciated that when the minutes display is incorrect
by a few minutes it is only necessary to index same by rapidly
deflecting switch 5 to thereby effect correction. Alternatively,
when the minutes display is incorrect by more than just a few
digits, the increased frequency will more rapidly make the
necessary correction, it being a desirable expedient to stop the
high speed indexing of the minute digit in advance of the correct
digit and complete the exact correction of the digit by returning
to the indexing by one mode of operation. The signals applied to
the minute digit counter are depicted in FIG. 2.
Depicted in FIG. 3 is an electronic circuit which is adapted to
control a time correcting input such as would be utilized in
correcting circuit 7 depicted in FIG. 1. A four stage flip-flop
which is adapted to divide a signal by 24, supplies an output
signal thereof to a D-type flip-flop which has a memory cycle of 2
seconds, which in turn applies output signals to AND gates 10a and
10b which have common outputs to a NOR gate to provide a gating
circuit. A microswitch input for minutes correction is applied to
the reset terminal of the four stage flip-flop and is further
supplied to the reset terminal of the D-flip-flop as well as to one
input of AND gate 10b. Similarly the 8 Hz output besides being
applied as the input to the four stage flip-flop is further applied
to AND gate 10a and is gated by the D-type flip-flop. The
wave-forms of the circuit are illustrated in FIG. 4.
It is understood that although the preferred embodiment illustrated
herein shows an apparatus for correcting minutes, it is possible to
use such correcting apparatus for seconds, hours, days, dates,
etc.
It will thus be seen that the objects set forth above, among those
made apparent from the preceding description, are efficiently
attained and, since certain changes may be made in the above
construction without departing from the spirit and scope of the
invention, it is intended that all matter contained in the above
description or shown in the accompanying drawings shall be
interpreted as illustrative and not in a limiting sense.
It is also to be understood that the following claims are intended
to cover all of the generic and specific features of the invention
herein described, and all statements of the scope of the invention
which, as a matter of language, might be said to fall
therebetween.
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