JPS6410794B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic timepiece having an electro-optical display device and a hand that rotates above the electro-optic display device and displays the time by being driven by a step motor.

Conventionally, in the electronic timepiece described above, the pointer may overlap directly above the liquid crystal display section serving as an electro-optical display device. In this case, when information other than time information, such as calendar information, stopwatch time, and alarm time, is displayed on the liquid crystal display section, the displayed information overlaps with the hand, making it difficult to read.

The present invention has been made based on the above-mentioned circumstances, and an object thereof is to provide an electronic timepiece in which information displayed on an electro-optical display device can be easily read.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows a schematic circuit configuration diagram of the present invention. In the figure, 1 is an oscillator (OSC), and the reference oscillation signal output from this oscillator 1 is input to a frequency divider circuit (DIV) 2, where it is The divided 100Hz signal for stopwatch is output to AND gate 3, and the 16Hz signal for fast forward is output to AND gate 4, once every second.
The 1P/S signal is output to the sexagesimal counter 5, respectively.
The sexagesimal counter 5 counts the input 1P/S signal, and when 60 is counted, the minute signal is sent to the time counter 6.
and output to AND gate 7, respectively. The minute signal output from the AND gate 7 is sent to the AND gate 9 and the drive circuit (DRIVER) via the OR circuit 8.
10 respectively. This drive circuit 10 drives a step motor in accordance with an inputted minute signal to rotate a wheel train 11, and rotationally move a pointer 12 consisting of a minute hand and an hour hand attached to this wheel train 11.

On the other hand, _S1 is a mode changeover switch, and the operation signal of this switch _S1 is input to the T-type flip-flop 13. This T-type flip-flop 13 inverts its output state each time the operation signal is input, and its Q side output is output from AND gates 3, 4, 9.
In addition to being input to the AND gates 14 and 15, the one-shot circuit 16, and the down terminal of the up-down counter 17. Further, the side output of the T-type flip-flop 13 is used as an up terminal of an AND gate 7 and an up-down counter 17, and is also input to a one-shot circuit 18 and an AND gate 19, respectively. When the one-shot circuits 16 and 18 each have a signal input, they output one-shot signals to the S-side input terminal of the RS type flip-flop 21 and the reset input terminal R of the up-down counter 17, respectively, via the OR circuit 20. The Q output of the RS type flip-flop 21 makes the AND gate 4 openable, and the output of the AND gate 4 is inputted to the AND gate 9 and the drive circuit 10 via the OR circuit 8, respectively. Further, the output of the AND gate 9 is inputted to the up-down counter 17 as a counting signal. The up-down counter 17 has an initial value of "12:
Each time the 16Hz signal is input, the contents are lowered from ``00'' to the initial value ``00:
Each time a 16Hz signal is input from "00", the contents are uploaded and output to the matching circuit 22. Further, the time counter 6 counts the input minute signals to update the current time data, and outputs this current time data to the matching circuit 22 and the AND gate 19. The matching circuit 22 compares the input current time data and the counted time data of the up-down counter 17, and outputs a matching signal when both time data match.
It is output to the R side input terminal of the RS type flip-flop 21. Further, the current time data output from the AND gate 19 is input to the liquid crystal display section 24 via the OR circuit 23, and is digitally displayed on the liquid crystal display section 24.

Further, _S2 is a start/stop switch, and the operation signal of this start/stop switch _S2 is sent to the T terminal of the T-type flip-flop. The Q-side output of this T-type flip-flop 25 is input to AND gates 3 and 14, respectively, and the 100Hz signal output from AND gate 3 is sent to a stop watch (ST) counter 26 as a counting signal. is input. On the other hand, the operation signal of the reset switch _S3 is input to the AND gate 14,
The output of the AND gate 14 is input to the R input terminal of the stopwatch counter 26. The stopwatch counter 26 counts the input 100Hz signal and sends the measured time data to the AND gate 15.
Enter. The time data output from the AND gate 15 is passed through an OR circuit 23 to a liquid crystal display section 24.
will be sent and displayed.

FIG. 2 shows a plan view of the electronic wristwatch with the above-mentioned electronic circuit built in. Around the surface of the octagonal dial 27, time indicators are provided at equal intervals, and in the center there are Clock 12a, minute hand 12
The base end of the pointer 12 consisting of b is attached.
A rectangular liquid crystal display section 24 is provided by cutting out a part of the dial plate 27.
The pointer 12 is configured to rotate above. Furthermore, one side of the dial 27 is provided with a crown 28 for manually setting the time, the start/stop switch S ₂ and the reset switch S ₃ , and the opposite side is provided with the crown 28 for manually setting the time. A mode changeover switch _S1 is provided.

Next, the operation of the electronic timepiece with the above configuration will be explained. Now, a “1” signal is output from the Q output terminal of the T-type flip-flop 13, and the RS
It is assumed that the type flip-flop 21 is in a reset state. In this state, the minute signal output from the sexagesimal counter 5 is input to the drive circuit 10 via the AND gate 7 and the OR circuit 8, and the step motor is driven to rotate the pointer 12 via the wheel train 11. On the other hand, the minute signal is counted by the clock counter 6, and the current time data is displayed on the liquid crystal display section 24 via the AND gate 19 and the OR circuit 23. By the way, as shown in FIG. 2A, when the current time is 7:27, the hour hand 12a is displayed on the liquid crystal display section 24.
and the minute hand 12b are positioned. At this time, when the mode changeover switch _S1 is operated to display the time data measured as a stopwatch on the liquid crystal display section 24, a "1" signal is output from the Q output side of the T-type flip-flop 13, and the AND gates 4 and 9 , 15 become openable, and the up/down counter 17 is designated to be down. At the same time, a one shot signal is output from the one shot circuit 16, which sets the RS type flip-flop 21 via the OR circuit 20 and resets the up/down counter 17 to set the initial value to "12:
00". Also, at the same time, and gate 1
9, the output of the current time data is stopped, and as a result, the content "00:00" of the ST counter 26 is displayed on the liquid crystal display section 24. Since the Q side output of the RS type flip-flop 21 enables the AND gate 4 to open, the 16Hz output from the frequency divider circuit 2
The signal passes through an AND gate 4, an OR circuit 8, a drive circuit 10, and a wheel train 11 to rapidly advance the pointer 12.
On the other hand, the 16Hz signal is input to the up-down counter 17 via the AND gate 9, and each time the 16Hz signal is input, the content is the initial value of time data "12:00".
will be counted down from When the time on the up-down counter 17 matches the current time on the time counter 6, that is, when the hand 12 points to 12 o'clock as shown in FIG. 2B, a match signal is output from the match circuit 22. RS type flip-flop 2
1 is reset. As a result, the rapid forward movement of the pointer 12 is stopped, and the pointer 12 stops at the 12 o'clock position.

Next, when timing is to be performed using a stop watch, the start/stop switch _S2 is operated.
Then, a "1" signal is output from the Q output terminal of the T-type flip-flop 25, and the AND gate 3 is kept open. Then, a 100Hz signal is input to the stopwatch counter 26 via the AND gate 3, and time measurement in units of (1/100) seconds is started. 23 and is displayed on the liquid crystal display section 24. Next, when you operate the start stop watch S ₂ again to finish timing, the T
The output state of the type flip-flop 25 is reversed and Q
The output terminal becomes "0" state, and as a result, the output of the 100Hz signal via the AND gate 3 is stopped, and the timekeeping operation of the stopwatch counter 26 is also stopped.
The time data that has been measured continues to be displayed on the liquid crystal display section 24. If you want to erase the time data displayed on the liquid crystal display section 24, operate the reset switch _S3 . This operation signal resets the stopwatch counter 26 via the AND gate 14, and as a result, the time data displayed on the liquid crystal display section 24 is erased. The clock data of No. 24 is also erased. Note that while the watch is being used as a stopwatch, the minute signal is always input to the time counter 6 and the current time is continuously updated.

After the use as a stopwatch is finished,
When the mode changeover switch _S1 is operated, a "1" signal is output from the output terminal of the T-type flip-flop 13, and the AND gates 17 and 19 are enabled to open. is displayed on the liquid crystal display section 24. At the same time, the "1" signal designates the up-down counter 17 to be in the up state and is further input to the one-shot circuit 18. Then, a one-shot signal is output from the one-shot circuit 18, which sets the RS type flip-flop 21 via the OR circuit 20, resets the up-down counter 17, and changes its contents to "00:00".
shall be. Since the set output of the RS type flip-flop 21 is input to the AND gate 4,
The 16Hz signal passed through AND gate 4, OR circuit 8, and AND gate 9 is sent to up-down counter 17.
is counted. On the other hand, this 16Hz signal drives a step motor to rotate the pointer 12. When the matching circuit 22 detects a match between the contents of the up-down counter 17 and the contents of the time counter 6, that is, when the hand 12 is fast-forwarded to the position indicating the current time as shown in FIG. 2C,
A match signal is output from the match circuit 22 and resets the RS flip-flop 21, and as a result, the output of the 16Hz signal via the AND gate 4 is stopped.
The rapid forward movement of the pointer 12 stops.

In the above embodiment, the liquid crystal display unit 24 is configured to display time data when used as a stopwatch, but the display is not limited to this, and may display alarm time, time when used as a timer, time in another country, It may also be configured to display other information such as month and date.

Further, in the above embodiment, a cut window is provided at the lower part of the dial plate 27 and the liquid crystal display device 24 is arranged. However, the present invention is not limited to this. The liquid crystal display device 24 is not limited to digital display, and may be analog display.

Further, in the above embodiment, the pointer 12 is moved to the 12 o'clock position, but if, for example, liquid crystal display devices are provided at the upper and lower portions of the dial 27, the pointer 12 may be moved to the 9:15 position. Place the pointer 1 in a position that does not prevent the LCD display from being seen.
All you have to do is move 2.

Further, although the dial plate 27 is provided with the liquid crystal display device 24, it is not limited to a liquid crystal display, and other electro-optical display devices such as an ECD may be provided.

Further, in the above embodiment, both the hour hand 12a and the minute hand 12b were rotated clockwise for fast forwarding, but the hour hand 12a and the minute hand 12b may be fast forwarded separately, or the hour hand 12a and the minute hand 12b are rotated counterclockwise. You can let me.

As explained in detail above, according to this invention,
Pointer driving means 10 to 12 for rotating the pointer by rotation of a step motor to display the time, an optical display device 24 disposed within the rotation area of the pointer, and means 6 and 26 for obtaining a plurality of different data. , switching means for switching and displaying the plurality of different data on the optical display device by operating a switch _S1 ;
S ₁ , 13, 19, 15, 23, when a predetermined data among the plurality of data is switched and displayed on the optical display device by this switching means, a fast forward pulse is supplied to the pulse motor to move the pointer. Pointer moving means 1 that moves and stops at a predetermined position that does not overlap with the optical display device
6, 20, 21, 4, 8, 9, 17, supplying a fast forward pulse to the pulse motor when the predetermined data is switched and displayed on the optical display device by the switching means. pointer return means 18, 2 for returning the pointer to the current time position;
0, 21, 4, 8, 17, 22, 6, and when a switch is used to switch and display predetermined data on the optical display device, the pointer is automatically moved to a position where it does not overlap with the optical display device. In addition, when the switch is operated to display other data, the hands automatically return to the current time position, so in normal cases, the time data from the hands and the data on the optical display device will not match. Two pieces of data can be read at the same time, and since the pointer moves when the optical display device switches to display the specified data, it is possible to reliably prevent the pointer from interfering with the visibility of the data, making it easier to read the data, and also to make it easier to read the data. Data reading errors and pointer reading errors due to forgetting to save and restore can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a schematic circuit diagram of an electronic timepiece showing one embodiment of the present invention, and FIGS. 2A, B, and C are display state diagrams showing changes in the hands of the embodiment. 6...Time counter, 12...Pointer, 17...
Up-down counter, 22... Matching circuit, 24
...Liquid crystal display section, 26...Stop watch counter, 27...Dial board, _S1 ...Mode changeover switch, _S2 ...Start/stop switch.

Claims (1)

[Scope of Claims] 1. A pointer drive means that rotates the pointer by rotation of a step motor to display the time, an optical display device disposed within the rotation area of the pointer, and means for obtaining a plurality of different data. a switching means for switching and displaying the plurality of different data on the optical display device by operating a switch; and a switching means for switching and displaying predetermined data among the plurality of data on the optical display device by the switching means. pointer moving means for supplying a fast-forward pulse to the pulse motor to move and stop the pointer to a predetermined position that does not overlap with the optical display device; 1. An electronic timepiece comprising: pointer return means for returning the pointer to the current time position by supplying a fast-forward pulse to the pulse motor when the display is changed from predetermined data to other data.