JP3163403B2 - clock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece for correcting time based on a received signal.

[0002]

2. Description of the Related Art At present, in Japan, a time code is superimposed on a long-wave standard radio wave and transmitted under the jurisdiction of the Ministry of Posts and Telecommunications. In this signal, one minute is defined as one frame, and the time data from the accumulated number of days since January 1 to the hour and minute is transmitted serially in binary code. Specifically, one bit is a rectangular pulse of 1 Hz, weighting of "1" and "0" is represented by setting the pulse width to 500 mS and 800 mS, respectively, and further, 200 mS as a position marker.
And a carrier of 40 kHz is used.

[0003] In a clock that performs time correction and the like in accordance with this signal, power is supplied to a receiving circuit for a fixed time from a fixed time every day to perform reception and time correction.

[0004]

However, in the above-mentioned apparatus, when a load such as a drive motor for a time hand or an alarm sounding circuit is driven while a signal is being received, the load is driven. There is a problem that noise or the like is generated and mixed into the received signal, so that the time cannot be accurately corrected.

[0005] It is an object of the present invention to provide a timepiece that can accurately receive and correct the time even when the load is driven.

[0006]

SUMMARY OF THE INVENTION The present invention, while receiving the receiving means the time information transmitted by the serial pulse train, by providing a control means for driving the load in a pulse non-generation timing in the pulse train Achieves the above objectives.

Preferably, the load is a drive motor for moving a time hand.

Further, the load may be used as an alarm generating means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to one embodiment shown in the drawings.

In FIG. 1, reference numeral 1 denotes a receiving circuit constituting a receiving means, which comprises an antenna, a tuning circuit, an amplifier, etc., and superimposes a time code (pulse train) on a long-wave standard radio wave under the jurisdiction of the Ministry of Posts and Telecommunications. Receive the signal. In this example, the time period during which power is supplied to the receiving circuit 1 is set to 0:59 to 1:06 every day for 7 minutes. This time zone is set by a cam (not shown) that rotates in conjunction with the hour hand 2a, minute hand 2b, and second hand 2c of the display device 2, and a switch and the like (not shown) opened and closed by the cam.
The display device 2 displays the current time with the hour hand 2a, minute hand 2b, and second hand 2c. Reference numeral 3 denotes an hour hand / minute hand drive circuit which operates the drive motor 4 to move the hour hand 2a and the minute hand 2b. It is assumed that the hour hand 2a and the minute hand 2b rotate in conjunction with each other by the train wheel. Reference numeral 5 denotes a second hand drive circuit which drives the drive motor 6 to move the second hand 2c. A detection circuit 7 shapes the waveform of the signal received by the reception circuit 1. A demodulation circuit 8 demodulates the signal whose waveform has been shaped by the detection circuit 7. 9
Is a control circuit, which is composed of a ROM and a RAM storing a program for operating the CPU and the control circuit 9 itself, and controls various operations. The control circuit 9 corrects the display time based on the signal on which the time code received by the receiving circuit 1 is superimposed. When the receiving circuit 1 receives the signal, the control circuit 9 generates no pulse in the time code. And a control means for driving the load at the timing. Reference numeral 10 denotes a time data storage circuit, which comprises a RAM, a 60-digit counter, etc., and stores a time code, that is, time data, which is received and digitally converted, for two frames as needed, and a one-second pulse output from the control circuit 9. To count the seconds digits. In addition,
The second counter is reset by a reset signal output when the control circuit 9 detects a pulse of 200 ms twice consecutively. An oscillation circuit 11 includes a crystal oscillator, a frequency divider, and the like, and outputs a reference clock signal. Reference numeral 12 denotes an hour / minute hand sensor, which is composed of a photo interrupter or the like, and detects holes provided in respective gears of the display device 2 which rotate in conjunction with the hour hand 2a and the minute hand 2b. In this example, the hour hand 2a and the minute hand 2b serve as 1
The holes described above are provided at positions detected when 2:00 is displayed, and the hour hand 2a and the minute hand 2b provide one hole.
When 2:00 is displayed, a detection signal is generated. Reference numeral 13 denotes a second hand sensor, which includes a photo interrupter or the like, and detects a hole provided in a gear that rotates in conjunction with the second hand 2c of the display device 2. In this example, the above-mentioned hole is provided at a position detected when the second hand 2c indicates 0 second.
A detection signal is generated when c indicates 0 seconds. Reference numeral 14 denotes a time counter, which comprises an hour / minute counter and a second counter, counts the hour / minute hand drive signal and the second hand drive signal output from the control circuit 9 and counts the display time of the display device 2. When the detection signal is generated from the hour / minute hand sensor 12, the hour / minute counter is reset. When the detection signal is generated from the second hand sensor 13, the second counter is reset. Reference numeral 15 denotes a sound signal circuit which constitutes an alarm generating means, which comprises a speaker or the like, and a cam (not shown) which rotates in conjunction with the hour hand 2a and the minute hand 2b of the display device 2, and an alarm switch which is opened and closed by the cam. At the time set by (not shown), an alarm is generated. 16 is a counter.

Next, the time correction operation when the power is turned on will be described with reference to FIGS. In this example, when the power is turned on, first, the display time of the display device 2 is set as a reference time, and the time hand is fast-forward-moved by the difference between the reference time and the received time data to correct the display time. Used.

First, an operation of setting the display time of the display device 2 to a reference time (12:00 in this example) will be described with reference to FIGS.

When a power-on signal is input from the terminal A to the control circuit 9, the control circuit 9 sets the reception end flag in the control circuit 9 to 0 (step 2a), activates the reception circuit 1, and sets the time code to the long-wave standard radio wave. Is started (step 2b).

Then, the second hand 3c is moved to 0 second (step 2c).

The operation of step 2c will be specifically described with reference to FIG.

The receiving circuit 1 outputs the received signal to a detection circuit 7, and the detection circuit 7 shapes the waveform of the input signal. The signal whose waveform is shaped by the detection circuit 7 is demodulated by the demodulation circuit 8 and 1 bit is converted into a 1 Hz rectangular pulse.
Weighting of “1” and “0” is performed with a pulse width of 500 m
A pulse with S, 800 mS and a position marker of 200 mS is output to the control circuit 9 (step 3a).

The control circuit 9 determines whether the pulse width of the input pulse is 200 ms, 500 ms, or 800 ms.
Is determined (steps 3b, 3c, 3d).

If the pulse width of the input pulse is not included in the above, that is, neither 200 mS nor 500 mS or 800 mS, the control circuit 9 determines that the reception has not been performed correctly and does not take in the data, but proceeds to step Return to 3a.

If the pulse width of the input pulse is 200 mS, the control circuit 9 determines that the pulse is a position marker and stores the position marker data in the time data storage circuit 10 (step 3e). At this time, when the position marker data is stored for the first time continuously, that is, 200 m
If the S pulse is detected twice for the first time in a row, the control circuit 9 determines that the next input pulse is the beginning of one frame of the time code, and stores the pulse in the time data storage circuit 10 until now. The set time data is cleared, the time data based on the time code to be received next is stored in the time data storage circuit 10, and a reset signal is output to the second counter of the time data storage circuit 10 to reset the second counter to 0. Seconds, then start counting seconds again. In this example, in order to obtain accurate time data, if time data for three frames has elapsed by one minute, the time data is stored and updated for two frames in the order received, and the latest frame data is stored. Is used as current time data. If the time of each successive frame has not elapsed by one minute, three time codes are received again.

After the end of step 3e, the control circuit 9 determines whether time codes for three frames have been received (step 3).
f) That is, it is determined whether four consecutive detections of a 200 mS pulse have occurred four times. If reception of three frames has not been correctly completed, that is, one minute has passed since the time of one continuous frame has elapsed. If the occurrence has not occurred twice consecutively, the counter 16 is cleared (step 3g).

After clearing the counter 16 (step 3g), the control circuit 9 outputs a fast-forward drive signal (in this example, a drive signal of 35.7 Hz) to the second hand drive circuit 5 to operate the drive motor 6. Then, the second hand 2c is moved by one pulse (step 3h). At this time, the time counter 14
Since the second counter inside counts the drive signal, the second hand 2
The display seconds of c are counted. In this example, the second hand 2c is set to move for one second with one pulse of the fast-forward drive signal. Then, 1 is added to the count value of the counter 16 (step 3i).

At this time, if the second hand 2c is not at the position for displaying 0 second (step 3j), that is, if no detection signal is generated from the second hand sensor 13, the control circuit 9
It is determined whether or not the count value is “28” (step 3
k) If not "28", return to step 3h and perform the same operation as above. In this example, steps 3h to 3k
Is almost equal to the time for outputting the drive signal in step 3h, so that the counter 16 counts "28" because the time within about 800 mS has elapsed since the detection of the pulse having the pulse width of 200 mS. become.

Before the counter 16 reaches "28", the second hand 2
When c indicates 0 second and the second hand sensor 13 generates a detection output (step 3j), the operation of the second hand 2c is stopped (step 3m), and the operation of step 2c is terminated. At this time, the second counter of the time counter 14 is reset.

Even if the counter 16 reaches "28", the second hand 2
If c does not indicate 0 seconds (step 3k), step 3
Returning to a, the width of the next input pulse is detected in the same manner as described above.

That is, when the time code of three frames is not correctly received and a pulse having a pulse width of 200 mS is input, 800 pulses are input until the next pulse is input.
Since there is a time of mS, the hand is fast-forwarded during this 800 ms, that is, until the count value of the counter 16 counts "28", or until the second hand 2c indicates 0 second. Therefore, noise or the like generated by hand movement occurs when a pulse including a time code is not input, and reception can be performed accurately.

When the pulse width of the input pulse is 500 ms (step 3c), the control circuit 9 stores "1" in the time data storage circuit 10 (step 3n), clears the counter 16 (step 3p), and sets the second hand. The fast-forward hand movement as described above is performed until 2c indicates 0 seconds or the counter 16 counts "16".

That is, when the time code for three frames is not correctly received and a pulse having a pulse width of 500 mS is input, 500 mS until the next pulse is input.
Since there is a time S, the fast-forward hand moves during this 500 ms, that is, until the counter 16 counts "16", or until the second hand 2c indicates 0 second. Therefore, noise or the like generated by hand movement occurs when no pulse is input, and reception can be performed accurately. Hereinafter, the same operation as described above is performed.

When the pulse width of the input pulse is 800 ms (step 3d), the control circuit 9 stores "0" in the time data storage circuit 10 (step 3q), clears the counter 16 (step 3r), and displays the data. The fast-forward hand movement as described above is performed until the device 2 displays the hour or the counter 16 counts "4".

That is, when the time code for three frames is not correctly received and a pulse having a pulse width of 800 mS is input, 200 m is required until the next pulse is input.
Since there is only the time S, the hand is fast-forwarded during this time, that is, until the count value of the counter 16 counts "4" or during that time until the display device 2 displays the hour. Therefore, noise or the like generated by hand movement occurs when no pulse is input, and reception can be performed accurately. Hereinafter, the same operation as described above is performed.

If the time code is correctly received for three frames before the second hand 2c indicates 0 second (step 3f), that is, a pulse having a pulse width of 200 ms is input to the control circuit 9 twice consecutively, and If the time data of each frame is updated every minute, the control circuit 9 outputs a reset signal to the time data storage circuit 10 to adjust the seconds and set the reception end flag to “1”. (Step 3s), the operation of the receiving circuit 1 is stopped (step 3s).
t), the second hand 2c is set to 0 second by fast-forwarding (step 3u).

When the second hand 2c indicates 0 seconds (step 2)
c) Then, the hour hand 2a and the minute hand 2b are moved to display 12:00 (step 2d).

The operation of step 2d will be specifically described with reference to FIG.

The control circuit 9 determines whether the reception end flag is "0" (step 4a). That is, 3
It is determined whether the time code for the frame has been received.

If the reception end flag is "0", that is, if the time codes for three frames have not been received, reception is performed in the same manner as described above (step 4b), and the pulse width of the input pulse is 200 mS. , 500 mS or 800 mS (steps 4c, 4c).
d, 4e), the same operation as described above is performed, and the counter 16
Outputs a fast-forward drive signal to the hour hand minute hand drive circuit 3 to operate the drive motor 4 until the predetermined value corresponding to the pulse width of the received input pulse is counted, and displays the hour hand 2a and the minute hand 2b at 12:00. Move the hand to the position. At this time, since the hour / minute counter of the time counter 14 counts the drive signal, the hour / minute counter counts the display time of the hour hand 2a and the minute hand 2b. Thereafter, the hour hand 2a and the minute hand 2b are moved in the same manner as described above. In this example, the hour hand 2a and the minute hand 2b are set to move one minute by one pulse of the fast-forward drive signal.

12:00 is displayed by the hour hand 2a and the minute hand 2b (step 2d). If the reception end flag is "0" (step 2e), the reception is continued until the time code for three frames is correctly received. Continue (step 2f). When the reception end flag is "1", step 2h described later is performed.

In step 2f, when the correct reception of the time codes for three frames is completed, the control circuit 9 sets the reception end flag to "1" and ends the operation of the reception circuit 1 (step 2g).

When the reception end flag becomes "1", the control circuit 9 reads out the latest time data from the two types of time data stored in the time data storage circuit 10 as the current time data, and The hour hand 2a is compared with the count value of the time counter 14 counting the time information.
A fast-forward drive pulse is output to the hour hand / minute hand drive circuit 3 so as to display the time read by the hour hand 2b and the minute hand 2b, and the drive motor 4 is driven to display the time read by the hour hand 2a and the minute hand 2b. A fast-forward drive pulse is output to the second hand drive circuit 5 so that the second hand 2c displays the count value of the second counter of the circuit 10, and the second hand 2c displays the count value of the second counter of the time data storage circuit 10 (step 2h).

When the timing is completed, the control circuit 9 moves the hour hand 2a, minute hand 2b and second hand 2c every second to display the current time on the display device 2 (step 2i).

Then, the display time of the display device 2 is 0:59.
When the time reaches １ ： 1: 06, power is supplied to the receiving circuit 1 by a cam (not shown) rotating in conjunction with the hour hand 2a, minute hand 2b and second hand 2c and a switch (not shown) opened and closed by the cam. Then, the operation after step 2a is executed.

Next, the operation when an alarm occurs will be described with reference to FIG.

When the alarm time comes and the alarm signal output from the display device 2 is input to the control circuit 9, the control circuit 9
Judge whether it is receiving.

During reception, the control circuit 9 detects the pulse width and stores the data in the same manner as described above, and then, when the pulse is not generated, that is, while the counter 16 performs a predetermined count, the sound signal circuit. 15 is operated to issue an alarm. In this example, the counter 16 counts a predetermined number of reference clock signals output from the oscillation circuit 11 and measures the non-generation time of the pulse. Specifically, the pulse width is 20
When a pulse of 0 mS is input, 28 counts are performed,
1 when a pulse with a pulse width of 500 ms is input
Six counts are performed, and when a pulse having a pulse width of 800 mS is input, four counts are performed.

That is, the operation of the alarm circuit 15 is performed when no pulse of the received time signal is generated in the same manner as described above, so that a pulse including a time code is not input as noise or the like generated by the alarm sound. Occasionally, reception can be performed accurately.

[0044]

According to the present invention, the receiving means receives time information transmitted by a serial pulse train .
In the meantime , by providing the control means for driving the load at the pulse non-generation timing in this pulse train, for example, the time hands are moved to the pulse non-generation timing,
Reception can be performed accurately while moving the time hands, and the time can be adjusted.

Since the alarm generation means is operated at the non-pulse generation timing, accurate reception can be performed while the alarm is being notified, and the time can be corrected.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of FIG. 1;

FIG. 3 is a flowchart for explaining the operation of FIG. 1;

FIG. 4 is a flowchart for explaining the operation of FIG. 1;

FIG. 5 is a flowchart for explaining the operation of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 receiving means 4 drive motor 6 drive motor 9 control means, correction means 15 alarm generation means

Claims (3)

(57) [Claims] 1. Receiving means for receiving time information transmitted by a serial pulse train, correcting means for correcting a display time based on the pulse train received by the receiving means, and receiving the pulse train by the receiving means While doing
A timepiece comprising: control means for driving a load at a pulse non-generation timing in the pulse train. 2. The timepiece according to claim 1, wherein the load is a drive motor that moves a time hand. 3. The timepiece according to claim 1, wherein the load is an alarm generating means.