JPS5916868Y2 - Calendar display electronic clock - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a calendar display electronic timepiece having the function of counting and displaying the month of February up to 29.

Conventionally, there are calendar display electronic clocks used in general-purpose wall clocks, automobile clocks, etc. that have the function of counting and displaying February up to the 29th. In order to count up to the 29th of February in a normal year, the date must be corrected three times every four years, and errors such as changing the month or moving the day too far occur during this correction. It had the disadvantage of being easy.

The present invention was developed to eliminate these drawbacks, and improves operability by reliably correcting the day when counting up to 29 days in February that is not a leap year. This invention provides a calendar display electronic clock.

Embodiments of the present invention will be described below with reference to the drawings.

The figure is a basic block diagram showing an embodiment of a calendar display electronic timepiece according to the present invention.

In the figure, 1 is an oscillation circuit that generates a time reference signal using a crystal oscillator 2 and an inverter 3, and 4 is a frequency divider that divides the time reference signal from the oscillation circuit 1 in multiple stages and outputs a second signal and a fast forward signal, respectively. 5 is a second counter, 6 is a minute counter, 7 is an hour counter, 8 is a day counter, 9 is a month counter, and 10 is a selection switch which will be described later. A display selection circuit which switches between displaying the hour and 7 minutes and displaying the 9th of the month in accordance with the operation; 11 is a coder that decodes the clock signal of 9 minutes and 9th of September switched by the display selection circuit 10; 12 is a fluorescent light; It is a 4-digit digital display consisting of display elements such as display tubes.

SL is a right digit correction switch for correcting the display contents of the right digit of the digital display 12 by fast forwarding, S2 is a left digit correction switch for correcting the display contents of the left digit of the digital display 12 by fast forwarding. This is a selection switch for switching the clock signal from each counter for hour 9 minutes May 5 to display hour 5 minutes and month 5. When off, the 1 signal is inverted to O signal by inverter 13. This O signal is outputted to the display selection circuit 10 through the timer circuit 14, and the O signal is used to select the o'clock 9 minute signal.When on, the O signal is inverted to a 1 signal by the inverter 13, and this inverted 1 signal is output. is outputted to the display selection circuit 10 so that the signal for the 9th day of the month can be selected using one signal.

Note that the timer circuit 14 automatically returns to normal mode after a preset time when the selection switch S3 is turned on.

This is to return to minute display, but is not necessarily necessary.

15 to 17 are inverters, 18 to 23 are AND gates,
24 to 27 are exclusive or gates, 28 is a memory for storing predetermined information for February 29th, and 29 is a memory for comparing the stored contents of the memory 28 with the counted contents of each counter 8 and 9 of the exit angle. A coincidence circuit that outputs a signal L when a match occurs; 30 is a flip-flop that is triggered by the 1 output signal from the coincidence circuit 29 to take out a Q output signal; a flip-flop 31 is an inverter that inverts the output signal of the coincidence circuit 29; An OR gate inputs two signals related to the operation of the right digit and left digit correction switches S1 and S2, and 33 is a monomulti which is triggered by the output signal 1 of the OR gate 32 to generate a pulse with a predetermined pulse width. vibrator, 35
, 36 is an AND gate that opens and closes based on the Q output signal of the flip-flop 30, and 37 is a right digit correction switch S1.
A mono multivibrator 38 serves as a pulse generation circuit that generates one pulse by triggering the signal L caused by the turning on of the mono multivibrator 37. A delay circuit for delaying a time longer than the pulse width; 39 is an AND gate that outputs each output signal of the mono multivibrator 37 delayed by the coincidence circuit 29 and the delay circuit 38; 49 is an AND gate for each ant gate.
The output signal of this OR gate 40 is supplied to the day counter 8 through an exclusive shifter gate 26.

Next, the operation of the above embodiment will be explained.

Here, it is assumed that the flip-flop 30 has been reset in advance.

Normally, when the right digit, left digit correction switches S1, S2, and selection switch S3 are turned off as shown in the figure, the time reference signal from the oscillation circuit 1 is divided in multiple stages by the frequency divider 4 to generate a second signal. Obtain this second signal in seconds and minutes.

Time is measured by hour, day, and month counters 5 to 9.

At this time, the 0 signal associated with the off-off of the selection switch S3 is supplied to the display selection circuit 10, and the display selection circuit 10 sequentially sends the clock signals from the hour counter 7 and the minute counter 6 to the digital display 12 through the coder 11. output,
This causes the digital display 12 to display normal hours and minutes.

Next, when the right digit correction switch S1 is turned on when the hours and minutes are displayed, the inverter 15 outputs a signal of 1 to the AND gate 18.

As a result, the AND gate 18 outputs the 1 signal caused by the turning off of the selection switch S3 to the inverter 13.17.
The fast-forward signal sent from the frequency divider 4 is passed through the analog gate 20 to which the inverted 1 signal is supplied, and is supplied to the minute counter 6 through the exclusive OR gate 24.

Therefore, the minute counter 6 sequentially counts the fast forward signals that arrive when the right digit correction switch S1 is turned on, and outputs the count output signal to the digital display 12 via the display selection circuit 10 and the coder 11. By using the correction switch S1, minute correction can be made by fast forwarding.

At this time, the 1 signal caused by turning on the right digit correction switch S1 is also input to the mono multivibrators 33 and 37 via the AND gate 22 and OR gate 32, but the counting contents other than minute correction are not affected in any way. .

, and, unlike the right digit correction switch S1, when the left digit correction switch S2 is turned on, the left digit correction switch S2
When the inverter 18 turns on, the inverter 18 outputs a signal of 1 to the AND gate 19.

As a result, the AND gate 19 receives a fast-forward signal sent from the frequency divider 4 through the AND gate 20, which is supplied with a 1 signal obtained by inverting the 1 signal caused by turning off the selection switch S3 by the inverter 13.17. is passed through and sequentially supplied to the hour counter 7 through the exclusive OR gate 25, and the hour is corrected by fast forwarding using the left digit correction switch S2 in the same manner as the minute correction.

At this time, the 1 signal caused by turning on the left digit correction switch S2 is also input to the AND gate 23 and the OR gate 32, but the AND gate 21 is closed by the O signal caused by turning off the selection switch S3. Therefore, the counting contents other than the time adjustment are not affected in any way.

Further, when the selection switch S3 is turned on, a signal associated with this turning on is supplied to the display selection circuit 10, and the display selection circuit 10 receives the count output signals of the day counter 8 and the month counter 9 through the coder 11. output to the digital display 12, whereby the digital display 1
2 switches from the normal hour and nine minute display to a month seven day display, that is, a calendar display.

When in this calendar display state, right digit correction switch S
When 1 is turned on, the inverter 15 outputs a 1 signal to the AND gate 22 as the switch S1 is turned on.

Therefore, the AND gate 22 passes the fast-forward signal from the frequency divider 4 sent through the AND gate 21 to which the 1 signal associated with the ON of the selection switch S3 is supplied, and the AND gate 35 passes the fast-forward signal from the flip-flop 30. Since the Q output signal 1 is in the open state, the fast forward signal is sequentially supplied to the day counter 8 through the AND gate 35, the OR gate 40, and the exclusive OR gate 26.

As a result, the date can be corrected by fast forwarding while the right digit correction switch S0 is on.

At this time, the 1 signal associated with turning on the right digit correction switch S1 is also manually input to the mono multivibrators 33 and 37 via the AND gate 18 and the OR gate 32, but the counting contents other than the date correction are not affected in any way. .

When the left digit correction switch S2, which is different from the right digit correction switch S1, is turned on, the inverter 16 outputs a signal of 1 to the AND gate 23 as the left digit correction switch S2 is turned on. 23 passes the fast-forward signal selected from the frequency divider 4 through the AND gate 21 to which the 1 signal associated with the turning on of the selection switch S3 is supplied, and the AND gate 36 passes the fast-forward signal selected from the frequency divider 4.
Since it is in the open state with the Q output signal l from 0, the fast forward signal is sequentially supplied to the month counter 9 through the AND gate 36 and the exclusive OR gate 27.

Thereby, the month can be corrected by fast forwarding while the left digit correction switch S2 is on.

At this time, the l signal accompanying the turning on of the left digit correction switch S2 is also input to the AND gate 19, ORAGE'-) 32, but since the AND gate 20 is in the closed state, the counting contents other than the month correction are It will not be affected in any way.

On the other hand, when February 29th arrives during the counting operation, the coincidence circuit 29
compares the information for February 29th previously stored in the memory 28 with the count contents of the day and month counters 8 and 9, and outputs a signal of 1 that matches the information to the flip-flop 30, inverter 31 . At the same time, the flip-flop 30 is triggered by the signal 1 and the Q output signal is output to the AND gate 39.
to O and close the AND gates 35 and 36.

At this time, the selection switch S3 is turned on, and the display selection circuit 10 is switched from the normal hour and 7 minute display to the month and 5 day display by the 1 signal accompanying the switch S3 being turned on, and then the right digit correction switch S□ is turned on. When the switch S is turned on, a signal of 1 is output from the inverter 15 to the mono multivibrator 37, and this mono multivibrator 37 is triggered by the signal of 1 and outputs one pulse to the relay circuit 38. do.

As a result, when the pulse is delayed for a predetermined time by the delay circuit 38 and inputted to the AND gate 39, the pulse passes through the AND gate 39 and the OR gate 40, which are in an open state in response to a signal from the matching circuit 29, and is then input to the AND gate 39. The data is supplied to the day counter 8 through the OR gate 26, and the day counter 8 counts one pulse signal and changes the count from 29 to 1, thereby correcting the display from February 29th to March 1st. be done.

During the correction on this day, the mono multivibrator 33 is triggered by the 1 signal inputted through the OR gate 32 when the right digit correction switch S1 is turned on, generates a pulse, and supplies it to the AND gate 34. Since the output signal 1 from the matching circuit 29 is closed by the output signal O which is inverted by the inverter 31, the flip-flop 3
0 is not reset and holds the Q output signal at O.

Therefore, Antogame 1-35 and 36 are in a closed state,
The fast-forward signal from the frequency divider 4 is never input to the day counter 8.

After completing the correction on this day, when the right digit correction switch S1 is turned on again, the O signal is generated from the matching circuit 29, and the AND gate 39 is closed, while the AND gate 34 is turned on by the inverter 31. Since the output signal 1 opens the mono multivibrator 33, the switch S1
A pulse is generated by being triggered by the 1 signal associated with the turning on of the flip-flop 30, and this pulse is used as a reset signal to reset the flip-flop 30 through the AND gate 34, thereby returning the flip-flop 30 to its original state. .

According to this embodiment, when correcting the date on the 29th, the pulse output from the mono multivibrator 37 when the right digit correction switch S1 is turned on is set for the time set by the delay circuit 38, that is, the mono multivibrator 3
Since the input to the day counter 8 is delayed by a time longer than the pulse width of the pulse output from 3, after the output of the mono multivibrator 33 disappears, the date of the 29th is corrected and the output of the coincidence circuit 29 is becomes O.

Therefore, the flip-flop 3 is activated by the pulse of the mono-multivibrator 33 output when the switch S1 is turned on.
0 is reset and the AND gate 35 is in the open state (there is no possibility that the date will pass too much).
You can be sure to make the corrections on the same day.

Also, even if the right digit correction switch S1 is turned on by mistake and the left digit correction switch S2 is turned on, the AND gate 34
During the period when the output of 9 is at "l", it is in a closed state, so the month does not change.

As explained above, the present invention has a minute counter, an hour counter, a day counter, and a month counter. In a calendar display electronic watch that displays the date and also corrects the display with a fast forward signal by operating the correction switch 5, a coincidence device that detects when the count reaches February 29th and generates an output signal. a selection switch that switches between hour and nine minute display and month nine day display, a pulse generation circuit that generates one pulse signal when the date adjustment switch is operated, and a pulse generation circuit that generates one pulse signal only when there is an output signal from the coincidence circuit. a gate circuit that controls opening and closing so that a signal is supplied to the day counter; and a gate circuit that controls opening and closing so that the fast forward signal is not supplied to the day counter when there is an output signal of the coincidence circuit, and When the 5th day of the month is displayed by the switch, when the displayed content becomes February 29th, when the date correction switch is operated, the fast forward function is stopped and the pulse signal is output to the month counter. When counting the days of February that are not in a leap year up to 29 and making corrections on that day, you will not accidentally change the month or move the day too far, improving the operability of electronic watches. There is an effect.

[Brief explanation of the drawing]

The figure is a basic block diagram showing an embodiment of a calendar display electronic timepiece according to the present invention. 1... Oscillation circuit, 4... Frequency divider, 5...
...Second counter, 6...Minute counter, 7
...Takudera counter, 8...day counter,
9... Month counter, 10... Display selection circuit, 11... Coder, 12...
Digital display, 13°15~17.31...
・Inverter, 14... Timer circuit, 18~
23.34~36.39...and gate, 2
4～27・・・Exclusive or gate, 28
...Memory, 29 ...Concordance circuit, 30
...Flip-flop, 32.40...
・OR gate, 33, 37... Mono multivibrator, 38... Delay circuit, Sl...
...Right digit correction switch, S2...Left digit correction switch, S3...Selection switch.

Claims (1)

[Scope of utility model registration request] It has a minute counter, an hour counter, a day counter, and a month counter, and by driving each counter with a signal obtained by dividing the time reference signal, it displays the 9th minute of the hour or the 9th day of the month, and by operating the correction switch. A calendar display electronic watch that corrects the display using a fast-forward signal includes a matching circuit that detects when the count reaches February 29th and generates an output signal, an hour 1 minute display, and a month 9 day display. a selection switch for switching the date, a pulse generation circuit that generates one pulse signal when the date correction switch is operated, and a pulse generation circuit that opens and closes so that the pulse signal is supplied to the day counter only when there is an output signal from the coincidence circuit. and a gate circuit that controls opening/closing so that the fast-forward signal is not supplied to the day counter when there is an output signal of the matching circuit, and when the selection switch is in the state where the 5th day of the month is displayed. A calendar display electronic timepiece characterized in that when the display content reaches February 29th, the fast forward function is stopped and the pulse signal is output to a day counter when the date correction switch is operated.