JPH06265650A - Timepiece - Google Patents

Abstract

PURPOSE:To provide a time piece which effectively receives a time signal and corrects a time by controlling a reception time of receiving means for receiving a time signal of a predetermined time in response to a lapse time from the previous time of correcting a time of a time display unit. CONSTITUTION:At the time of delivering from a factory, a timepiece in a controller 7 is corrected to start counting, and an integrating counter 6 starts counting. A battery 9 is turned ON, a display time of a time display unit 4 is brought into coincidence with a counted time of the timepiece in the controller 7, and then the controller 7 so sets a reception starting time and a reception finishing time to a next receiving predetermined time signal in response to the counted value of the counter 6 and an accuracy of a crystal oscillator in the controller 7 as to be proportional to a read counted value, stores in a RAM in the controller 7, and operates a receiver 3 when it becomes a set time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece that receives a time signal and adjusts the time.

[0002]

2. Description of the Related Art A conventional clock that receives a time signal from a radio broadcast to adjust the time, for example, once a month at the end of the month.
In the timepiece that receives the hourly signal at 3:00 and corrects the time, the reception time range of the hourly signal is fixed so that the time measured by the internal clock becomes 23:00 ± 30 seconds.

[0003]

However, in the above-mentioned one, since the reception time range of the time signal is fixed, for example, when the time signal is inaccurate and the time signal cannot be received continuously due to noise or the like, The error of the internal clock accumulates, and the measured time deviates from the actual time by 30 seconds or more.
There is a problem that the time signal cannot be received within the reception time.

An object of the present invention is to reliably receive a time signal and perform timing.

[0005]

The present invention provides a receiving means for receiving a time signal of a desired time, a time display section for displaying the time adjusted by the input of the time signal, and a previous time display section of the time display section. The above object is achieved by providing a clocking means for clocking an elapsed time from the timing of and a control means for controlling the receiving time of the receiving means according to the value of the clocking means.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on an embodiment shown in the drawings.

In FIG. 1, reference numeral 1 is a receiving means, which is composed of an antenna 2 and a receiving circuit 3, and receives and outputs a time signal signal of NHK first broadcast, for example. In addition, AM 2: 0 on the 5th of every month
It is set to receive a time signal of 0. A time display unit 4 displays the current time with the hands 5, and is timed at 2:00 by the time signal output from the receiving circuit 3. Reference numeral 6 denotes an integrating counter which constitutes a time measuring means, and measures the elapsed time from the previous time adjustment of the time display section 4. Reference numeral 7 is a control circuit which constitutes a control means, and includes a CPU, a ROM, a RAM,
It consists of a crystal oscillator and frequency divider, has an internal clock with calendar information, and controls various operations. Reference numerals 8 and 9 denote batteries. The battery 8 is attached in the manufacturing process of the timepiece, and supplies power to the integration counter 6 and the control circuit 7. The battery 9 is inserted by the user when the watch is used, and includes a receiving circuit 3, a time display unit 4, an integrating counter 6, and a control circuit 7.
Supply power to. Reference numeral 10 is a voltage detection circuit that detects the charging of the battery 9. Reference numerals 11 and 12 are diodes.

Next, the operation when the battery 9 is inserted will be described with reference to FIG.

At the time of factory shipment, control is performed by inputting a time timing signal output from a time setting circuit (not shown) in the production line to the terminal A of the timepiece in which the battery 8 is inserted. The internal clock of the circuit 7 is clocked, the internal clock starts counting the current time, and the integration counter 6 is reset to "0" to start counting. At this time, since the control circuit 7 does not output the drive signal to the time display unit 4, the time display unit 4 does not display the current time.

As described above, since the internal battery 8 is turned on at the time of factory shipment and the internal clock is set to the current time, a troublesome time setting operation is not necessary when the user purchases this clock.

When the user purchases this watch and inserts the battery 9 (step 2a), the voltage detection circuit 10 generates a detection output to the control circuit 7.

The control circuit 7 outputs a fast-forward drive signal for the hands 5 in response to the detection output from the voltage detection circuit 10 to make the display time of the time display section 4 coincide with the time measured by the internal clock of the control circuit 7. (Step 2b). After the display time of the time display unit 4 and the clocked time of the internal clock of the control circuit 7 match, normal hand movement is performed.

After the time coincidence is detected, the control circuit 7 reads the count value of the integration counter 6 (elapsed time after the time adjustment at the time of factory shipment) (step 2c),
Depending on the read count value and the accuracy of the crystal oscillator in the control circuit 7, in proportion to the read count value,
The reception start time and reception end time for the next time signal to be received are set, and the set reception start time and reception end time are stored in the RAM in the control circuit 7 (step 2d).

As an example of setting the reception start time and the reception end time, for example, when the accuracy of the internal clock by the crystal oscillator in the control circuit 7 is about ± 20 seconds per month, the count value of the integrating counter 6 is x. If it is (Sunday), the reception start time and reception end time are “AM 2: 00-20 seconds × x / 3”.
0 ”,“ AM 2: 00 + 20 seconds × x / 30 ”, and if the count value of the integration counter 6 is one month (x = 30 days), the reception start time and the reception end time are“ AM 2: 00-
20 seconds ”and“ AM 2: 00 + 20 seconds. ”As the count value of the integrating counter 6 becomes 2 months, 3 months ..., the reception start time and reception end time are“ AM2:
00 ± 40 seconds ”,“ AM2: 00 ± 60 seconds ”, ...

When the internal clock of the control circuit 7 measures 5 days and the measured time reaches the reception start time stored in the RAM of the control circuit 7 (step 2e), the control circuit 7 causes the reception circuit 3 to operate. It is operated (step 2f).

When the receiving circuit 3 receives the time signal of 2:00 AM (step 2g), the internal clock of the control circuit 7 is set to A.
The time is corrected to M2: 00 (step 2h), the integration counter 6 is cleared (step 2i), and the display time of the time display unit 4 is corrected to 2:00 (step 2j).

When the correction of the display time of the time display section 4 is completed, the operation of the receiving circuit 3 is stopped (step 2k) and the operation is completed.

If the receiving circuit 3 does not receive the time signal by the reception end time (steps 2g, 2m), the operation of the receiving circuit 3 is stopped as described above. In this case, the count of the integration counter 6 is not reset and continues.

Next, the operation during normal hand movement will be described with reference to FIG.

The internal clock of the control circuit 7 is AM 2: 0 on the 5th.
One hour before 0, that is, when it becomes AM 1:00 (step 3a), the control circuit 7 reads the count value of the integration counter 6 (step 3b), and the count value read in the same manner as above and the crystal oscillator in the control circuit 7 are read. Depending on the accuracy of
The reception start time and reception end time for the next time signal signal to be received are set, and the set reception start time and reception end time are stored in the RAM in the control circuit 7 (step 3c). When the time measured by the internal clock of the control circuit 7 reaches the reception start time stored in the RAM of the control circuit 7 (step 3d), the control circuit 7 operates the reception circuit 3 (step 3e).

Thereafter, the same operation as described above is performed.

As described above, the reception time for receiving the time signal is changed in proportion to the accuracy of the crystal oscillator in the control circuit 7 and the count value of the integrating counter 6, so that the time signal can be reliably received. The clock can be timed accurately.

For example, when the time signal is not received, the count value of the integration counter 6 becomes large and the reception time becomes long, so that the accumulated error can be covered and the time signal is surely received. be able to.

In the above description, the reception start time and the reception end time are extended by 20 seconds each time the count value of the integration counter 6 passes one month. However, the accuracy of the crystal oscillator in the control circuit 7 is increased. It can be changed as appropriate. For example, when the precision of the crystal oscillator in the control circuit 7 is about ± 30 seconds per month, when the integration counter 6 is counting one month, the reception start time is “AM 2: 00-30 seconds” and the reception end time is Is set to “AM2: 00 + 30 seconds”, and thereafter, as the count value of the integration counter 6 becomes 2 months, 3 months ..., the reception start time and the reception end time are “AM2: 0”.
It is desirable to set such as 0 ± 60 seconds, AM2: 00 ± 90 seconds, ....

Further, in the above, the hourly signal of 2:00 am on the 5th of every month is received, but not limited to the above, the scheduled reception time, the reception interval, etc. can be changed as appropriate.

Further, in the above, the count value of the integration counter is read out one hour before the time signal signal to be received is generated, but this is not limited to the above, and can be changed as appropriate.

[0027]

According to the present invention, the reception time of the receiving means for receiving the time signal of the desired time is controlled according to the time elapsed from the last time adjustment of the time display section, so that the time signal is surely transmitted. Can be received and can be timed reliably. Therefore, accurate time display can be performed.

[Brief description of 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.

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

[Explanation of symbols]

 1 Receiving means 4 Time display section 6 Clocking means 7 Control means

Claims (1)

[Claims] 1. A receiving means for receiving a time signal of a desired time, a time display section for displaying the time, which is timed by the input of the time signal, and a time elapsed from the last time of the time display section. A timepiece comprising: a clocking means for clocking; and a control means for controlling the reception time of the receiving means according to the value of the clocking means.