JPS6034715B2 - electronic clock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time adjustment system for an electronic timepiece equipped with both a pointer type display device and an electro-optical display device.

Recently, electronic watches have been proposed that include both a pointer type display device and an electro-optical display device.

The problem when using a pointer type display device as the main time display in this type of watch is that it is difficult to extract accurate time information from the pointer type display device and process it in a circuit. . Therefore, even if an alarm device is added, an alarm cannot be issued at an accurate time, and even if an attempt is made to display the day and day of the week on an electro-optical display device, an error will occur in the time at which the day and day of the week are displayed. In order to eliminate such drawbacks, a method can be considered in which a circuit-like time counter that holds the same time measurement information as the time displayed on the pointer-type display device is provided, and the alarm alarm and the advance of the day and day of the week are controlled by this counter. .
When such a system is adopted, it is important to link the pointer type display device and the time held by the clock counter. In particular, if the time adjustments are not made in conjunction with each other, problems arise in that two types of adjustments have to be made, or that the interlocking state breaks down because only one is corrected. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a new method for interlocking correction of a pointer-type display device and a time counter. Another object of the present invention is to facilitate correction by displaying the contents of a correction signal on a pointer-type display device. For the above purpose, the electronic timepiece according to the present invention is provided with means for selecting a digit to be corrected in a time counter, and a pulse generation circuit that sends a correction pulse signal to the digit and a motor drive circuit, and a correction switch. When this is done, the pulse generation circuit sends a correction pulse signal to the selected digit, and at the same time sends a correction pulse signal to the motor drive circuit so that the displayed time on the time indicator type display device, which is the same as the time counter, is corrected. is being applied.

The selected digit is also displayed on the electro-optical display to indicate the content of the correction signal for correcting the pointer display. A detailed explanation will be given below based on the drawings.

The figure shows an example circuit of an electronic timepiece according to the present invention.

In FIG. 1, the reference signal outputted from the reference signal generation source 2 is frequency-divided by a frequency dividing circuit 4, and the frequency dividing circuit 4 outputs a 1 second signal. The second counter 6 inputs a 1 second signal and outputs a 1 minute signal, and the 1 minute signal is applied to the motor drive circuit 10' via an OR gate 8. The motor 12 is driven by a motor drive circuit and operates the pointer type display device 14. In this embodiment, the minute hand of the pointer type display device 14 is operated once every minute. The one minute signal is applied to the time counter 8 via the OR gate 16.

The time counter 18 consists of a 1-minute digit counter 20, a 10-minute digit counter 22, an hour digit counter 24, and a day/week digit counter 26, and the output is inputted to the next stage counter via OR gates 27, 29, and 31, respectively. has been done. seconds counter 6,
The timekeeping contents of the 1-minute digit counter 20, 10-minute digit counter 22, hour digit counter 24, and day/week digit counter 26 are converted into display segment signals by a decoder 28, and are sent to AND gates 30, 32, 34, 36, and 38, respectively. The liquid crystal drive circuit 40 drives an electro-optical display 42 consisting of a liquid crystal cell. Here, 1 minute digit counter 2
The 0 and 10 minute digit counter 22 and the hour digit counter 24 serve as counters for holding timekeeping information that is the same as the time displayed on the pointer type display device. Of course, the contents of the counter may be displayed only when necessary, such as when adjusting the time. The operation signal of the correction digit selection switch 44 is AND
It is input to the selector 48 via the gate 46.

A circuit composed of an AND gate 46 and a selector 48 is a correction digit selection circuit 49. The selector 48 is the switch 44
The digit to be corrected is selected in response to the operation signal. When the second digit is selected, the line 50 becomes the day, and when the minute digit, minute digit, hour digit, day/day digit is selected, lines 52 and 5 become the day.
4, 56, and 58 are days. AND gate 46
A 0 signal, which is the output of a down counter 60, which will be described later, is applied to the other input. The 0 signal is a signal that remains L while the second correction pulse signal 63 is being output.

Therefore, by the action of the AND gate 46, the operating signal of the correction digit selection switch 44 input during the correction pulse signal is invalidated. The pulse generation circuit 62 is a down counter 6
0, AND gate 6 4, 6 6, OR gate 6 8,
It consists of an inverter 70 and a differentiation circuit 72. When the correction switch 74 is operated, the operation signal is passed through the differentiation circuit 72 to A.
applied to the ND gate 64. Second modified pulse signal 6
Since the 0 signal is L while 3 is being output, the operation signal is invalidated and the output of the AND gate 64 maintains L. In the state where the predetermined correction signal has been outputted, the 0 signal is the day, so the operation signal is applied to the JAMIN terminal of the down counter 60 via the AND gate 64. The contents of the down counter 60 become equal to JAMDATA due to this signal, and the 0 signal becomes L. Then inverter 70
Since the output of the signal becomes "day", the AND gate 66 starts outputting the signal taken out from the frequency dividing circuit. The down counter 60 counts the output pulses of the AND gate 66, and when the number of output pulses becomes equal to the number set by JAMDATA, it sets a 0 signal and stops outputting pulses from the AND gate 66. The output of the AND gate 64 is the first modified pulse signal 61, and the output of the AND gate 66 is the second modified pulse signal 63. When the 1 minute digit is selected, the line 52 is the day, so the down counter 60 is JAM.
DATA is 1.

When the correction switch 74 is operated in this state, each of the AND gates 64 and 66 outputs one correction pulse signal for each operation. The output of AND gate 64 is A
The one-minute digit counter 20' is applied via the ND gate 76 and the OR gate 16, and the output of the AND gate 66 is applied to the motor drive circuit 10 via the OR gate 8. Therefore, the pointer type display device 14 and the time counter 8 are set to 1 at the same time.
Corrected minute by minute. Line 5 when the 1 minute digit is selected
Since 4 is a day, JAMDATA is 10.

Therefore, each time the correction switch 74 is operated, a correction pulse signal from the female is applied to the motor drive circuit 101.
One correction pulse is applied to the 0 minute digit counter 22 via an AND gate 78 and an OR gate 27. Therefore, the pointer type display device 14 and the time counter 8 are corrected by 1 minute. When the hour digit is selected, the line 56 is the day, so JAMDATA is 60.

Therefore, for each operation, a hexadecimal correction pulse is applied to the motor drive circuit 10, and a correction pulse of 1 is applied to the hour digit counter 24 via the state D gate 80 and the 0R gate 29. applied. Therefore, the pointer type display device 14 and the time counter 18 are corrected by one hour. When the day/week digit is selected and line 58 is the day, 52, 54, and 56 are all L
Therefore, JAMDATA is 0. Corrections are therefore made only to the time counter 8. JAMDATA also when the seconds digit is selected and line 50 is the day.
is 0. When the correction switch 74 is operated in this state, the output of the AND gate 64 is applied to the reset terminal of the second counter 6 via the AND gate 84. If the count content of the hour and second counter 6 is less than 3 degrees, the second counter 6 will only be reset, but if it is 30 or more, the second counter 6 will be set and at the same time a 1 minute signal will be output and a pointer type display. Device 14 and time counter 8 are incremented by a minute. In this embodiment, the pointer type display device 14 is shown without a second hand, but if it does have a second hand, it is effective to provide a second hand reset device and operate it in synchronization with the reset of the second counter.

In this case, the seconds return/zero device for the second hand may be mechanical or may be one that stores the position of the second hand and processes it electrically.
The periodic signal taken out from the frequency divider circuit 4 is applied to one input of the NAND gates 86, 88, 90, 92, and 94, and the day/week digit, hour digit, and 10 are applied to the other input, respectively.
Selection signals for minute digits, one minute digits, and second digits are applied, and the outputs are applied to one input of AND gates 38, 36, 34, 32, and 30, respectively. The periodic signal has a duty of 5
It is desirable that the frequency is about IHz at 0%. With this configuration, the display segment signal of the selected digit is periodically converted into a non-display signal by one of the AND gates 30, 32, 34, 36, and 38. Therefore, the display of the selected digit is in a flashing state. In this embodiment, by looking at the flashing digits, it is possible to confirm how the correction pulse signal for correcting the pointer-type display device 14 is selected. In other words, if you operate the correction switch 74 when the hour digit is flashing, six correction pulses will be given, and when the 10 minute digit is flashing, it will be 1 hour, and when the 1 minute digit is flashing, it will be 1 hour. One correction pulse is given each. This method of displaying the selected contents of the correction pulse is also effective when only the pointer-type display device is to be corrected. As for the display method, it is also effective to use a mark or the like, or to display the number of output pulses as a number. In this embodiment, a method has been described in which a predetermined number of correction pulse signals are output for each operation of the correction switch. A method that outputs is also effective.

For example, when the hour digit is selected, the first correction signal is given to the hour digit counter 24, and the motor drive circuit 1 is set to 6.
This is a method that provides a 0Hz correction signal. In the case of this method, it is necessary to set the correction signal given to the motor drive circuit so that it ends after a predetermined number of correction signals. As is clear from the above description, according to the present invention, it is possible to realize interlocking correction of the pointer type display device and the time counter.
In addition, the pointer type display device can be easily corrected, which is highly effective.

BRIEF DESCRIPTION OF THE DRAWINGS The drawing is a circuit diagram showing one embodiment of an electronic timepiece according to the present invention.

14... Pointer type display device, 12... Motor, 10
...Motor drive circuit, 18...Time counter, 24...
Hour digit counter, 20, 22...Minute digit counter, 42...
Electro-optical display device, 44... correction digit selection switch,
49... Correction digit selection circuit, 74... Correction switch, 62
. . . Pulse generation circuit, 61 . . . First modified pulse signal, 63 . . . Second modified pulse signal.

Claims (1)

[Scope of Claims] 1. In an electronic timepiece, a pointer type display device having at least an hour hand and a minute hand, a motor for operating the pointer type display device, a motor drive circuit for driving the motor, and at least an hour digit. The counter has a minute digit counter, a time counter that counts time in a circuit, an electro-optical display device that displays the contents of the time counter, and a correction digit selection switch that responds to an operation signal of the correction digit selection switch. a correction digit selection circuit for selecting a digit of the time counter to which the time should be corrected, a correction switch for correcting the selected digit, and outputting a correction pulse signal in response to an operation signal of the correction switch. and a pulse generation circuit that sends a first correction pulse signal to the counter of the selected digit in response to the operation signal of the correction switch, and sends a first correction pulse signal to the counter of the selected digit, and sends a second correction pulse signal to the motor drive circuit. The pulse generation circuit is configured to send a correction pulse signal, and the pulse generation circuit has a counter controlled by the selection circuit, and the counter determines the number of pulses of the second correction pulse signal by the pointer type display device. and the time counter are set to be corrected by the same amount of time. 2. The electronic timepiece according to claim 1, wherein the correction digit selection circuit is configured to invalidate a selection switch operation signal inputted while the correction pulse signal is being output. 3. The electronic timepiece according to claim 1, wherein the pulse generation circuit is configured to invalidate a correction switch operation signal inputted while outputting a correction pulse signal.