JP3837093B2 - Alarm clock with radio wave correction function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an alarm clock with a radio wave correction function that can automatically set an accurate time by receiving a standard time radio wave.
[0002]
[Prior art]
As a prior art, as a first example, Japanese Patent Laid-Open No. 7-159558 discloses that when alarm time notification is not performed on the day and the alarm time data is before the corrected time data, A time data receiving device that sounds an alarm sound different from a normal one is disclosed. This is to avoid the alarm time notification of the day from being performed due to the correction operation of the time data.
[0003]
As a second example, Japanese Patent Laying-Open No. 2000-199792 discloses a timepiece device that stops measurement without adjusting the time if the time correction width is not within the allowable error range. In this example, every time the positioning device measures according to the user's operation, the difference between the correction time based on the received time data and the current time is obtained to determine whether it is within the accuracy range (allowable error range). is doing.
[0004]
As a third example, Japanese Patent Application Laid-Open No. 2000-235093 discloses reception of all data for updating all the holding times of the clock, and reception of some data such as second correction for setting the second display to zero in the minute. A radio-controlled timepiece configured to do both is disclosed.
[0005]
[Problems to be solved by the invention]
In the first example, although it is possible to prevent the alarm sound from being stopped due to the time correction, it is not possible to prevent the alarm from sounding at an unexpected time when erroneous data is received. In the second example, the measurement is started by the user's operation. However, most of the alarm clocks automatically adjust the time. When the time is adjusted every time, a predetermined time for reception and correction is used. It is necessary and consumes a lot of power. Further, in the third example, since the reception frequency is changed between reception of all data and partial reception of data, a period counter for counting the reception interval is necessary.
[0006]
Therefore, in the present invention, the accuracy as a radio-controlled clock is maintained, and when used as an alarm clock, the alarm operation is performed while maintaining the accuracy as an internal electronic clock by eliminating the anxiety about malfunction of radio wave reception, and at the same time achieves power saving. To do.
[0007]
[Means for Solving the Problems]
The alarm clock with radio wave correction function of the present invention has a receiving circuit capable of receiving a standard time radio wave, an alarm set switch for setting on / off of an alarm, and an internal electronic clock, and a time for displaying the time of the internal electronic clock A display unit, and a control circuit for controlling them; the control circuit can be controlled to correct the time of the internal electronic timepiece by receiving the standard time radio wave ; When the time of the internal electronic timepiece becomes the reception time of the standard time radio wave and the alarm set switch is on after the standard time radio wave is received by the receiving circuit, the received time and the internal time comparing the time of the electronic timepiece, if the difference is greater than a predetermined value is characterized by controlling so as not to perform time correction of the internal electronic timepiece
[0008]
The alarm clock with radio wave correction function of the present invention has a receiving circuit capable of receiving a standard time radio wave, an alarm set switch for setting on / off of an alarm, and an internal electronic clock, and displays the time of the internal electronic clock. And a control circuit for controlling them. The control circuit can be controlled to correct the time of the internal electronic timepiece by receiving the standard time radio wave, and the control circuit If the alarm set switch is on when the time of the internal electronic clock becomes the reception time of the standard time radio wave, only 0 second of the standard time radio wave is detected by the reception circuit. Control is performed to receive and correct the time of the internal electronic timepiece.
[0009]
The alarm clock with radio wave correction function of the present invention has a receiving circuit capable of receiving a standard time radio wave, an alarm set switch for setting on / off of an alarm, and an internal electronic clock, and displays the time of the internal electronic clock. And a control circuit for controlling them. The control circuit can be controlled to correct the time of the internal electronic timepiece by receiving the standard time radio wave, and the control circuit If the alarm set switch is on after the time of the internal electronic timepiece is the reception time of the standard time radio wave and the standard time radio wave is received by the reception circuit, the received time and The time of the internal electronic timepiece is compared, and if the difference is less than or equal to the first predetermined value, or the change time assumed by the shift to daylight saving time is included If is less than the second predetermined value, it is characterized by controlling so as to perform time correction of the internal electronic clock.
[0012]
With this configuration, it is possible to maintain accuracy as a radio-controlled clock, and when used as an alarm clock, there is no fear of malfunction of radio wave reception, and correct alarm operation is performed while maintaining accuracy as an internal electronic clock. be able to. Further, since the operation time of the receiving circuit can be shortened, power saving can be achieved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
[0014]
As shown in a block diagram in FIG. 1, the alarm timepiece with radio wave correction function of the present invention transmits a standard time radio wave transmitted from a transmitting station (not shown) via a receiving antenna (not shown) at a predetermined reception time. Received by the receiving circuit 2. The control circuit 1 controls operations of the receiving circuit 2, the sound reporting device 3, and the time display unit 4. The alarm set switch 5 is externally attached to the alarm output terminal of the IC which is the control circuit 1, and sets the alarm on / off.
[0015]
The control circuit 1 is provided with an internal electronic timepiece (not shown), and this internal electronic timepiece always advances based on a signal from a transmission circuit such as a crystal. This crystal transmission circuit generally realizes a monthly difference of about ± 20 seconds. Even if the time is adjusted once a week, the amount of correction is about several seconds. The correction of the time by the standard time radio wave is normally performed every 24 hours, and am / pm is discriminated by an internal electronic clock, for example, at 2 am. If the standard time radio wave cannot be received correctly at 2 am, it is performed at 4 am, 2 pm, or 4 pm.
[0016]
The receiving circuit 2 receives the standard time radio wave and converts it into an electric signal, and the sound reporting device 3 notifies the alarm time by a sound such as a bell sound, an electronic sound or a melody. The time display unit 4 displays an internal electronic timepiece. The time display unit 4 may be a digital display using liquid crystal or an analog display that moves the hands. The alarm time is set by alarm time setting means (not shown). When the alarm set switch 5 is in the ON state, a sound is emitted from the time signal device 3 when the set alarm time matches the time of the internal electronic timepiece.
[0017]
An example of the operation of the alarm timepiece with radio wave correction function of the present invention will be described with reference to FIG. It is determined whether the time of the internal electronic clock has reached a predetermined automatic reception time (S1). If the time has reached, it is determined whether the alarm set switch 5 is on or off (S2), If it is in the off state, that is, if the alarm is not set, the receiving circuit 2 is set in the operating state, the standard time radio wave is received, and the time of the internal electronic timepiece is corrected based on the received time data (S3). If the alarm set switch 5 is in the on state, that is, the alarm is being set, the receiving circuit 2 is set to the inoperative state and automatic reception of the standard time radio wave is not started, and the internal electronic timepiece continues to advance.
[0018]
If operated in this way, the next morning alarm time is set, and if the alarm set switch 5 is turned on, the time is not automatically adjusted, so the internal electronic clock at the time when the alarm time is set Since the alarm sound is generated with the accuracy of the time, it can be used with confidence.
[0019]
Another operation example will be described with reference to FIG. First, it is determined whether or not the time of the internal electronic timepiece has reached a predetermined automatic reception time (S11). If the time has reached the time, the receiving circuit 2 is set in an operating state to receive a standard time radio wave (S12). ), It is determined whether the alarm set switch 5 is on or off (S13). If it is off, the time of the internal electronic timepiece is corrected based on the received time data (S14). On the other hand, if it is in the ON state, the received time data is compared with the time of the internal electronic timepiece, and it is determined whether the difference is equal to or smaller than a predetermined value (S15). The predetermined value is a value in a range where there is no problem even if the time is practically shifted, for example, 1 minute or 5 minutes. If the difference between the received time data and the time of the internal electronic timepiece is equal to or smaller than a predetermined value, the time of the internal electronic timepiece is corrected based on the received time data (S14). On the other hand, if the difference is greater than or equal to a predetermined value, the internal electronic timepiece continues to advance without correcting the time of the internal electronic timepiece.
[0020]
If operated in this way, when the standard time radio wave is received, the internal electronic clock is detected when the difference between the time of the internal electronic clock and the received time data is equal to or less than a predetermined value when the alarm set switch 5 is on. Since the time of the clock is corrected, even if the standard time radio wave is erroneously received, the correction is not more than a predetermined value, so that an alarm sound is generated within a practically acceptable range. If the difference is not more than a predetermined value and not an erroneous reception, the time of the internal electronic timepiece is corrected correctly, so that an alarm sound can be generated at an accurate time. When the difference is greater than or equal to a predetermined value, the time of the internal electronic timepiece is not corrected, and an alarm sound is generated with the accuracy of the time of the internal electronic timepiece when the alarm time is set.
[0021]
When the operation is performed based on the above-described FIG. 3, there may be inconvenience when the daylight saving time is currently being executed in various places. In other words, the daylight saving time is a method in which the time is advanced by one hour between April and October. For example, in the UK, the time is 1 hour earlier at 1 AM on the last Sunday in March, and 1 hour later at 1 AM on the last Sunday in October. In the United States, it is 1 hour ahead at 1 AM on the first Sunday in April, and 1 hour behind at 2 AM on the last Sunday in October. During this time, the time data of the standard time radio wave also changes, and an identification flag is set in the transmitted signal. Each consists of a summer time identification bit and a notice bit indicating a change schedule. Two extended bits are also prepared for Japanese standard time radio waves, and it seems that the method will be the same as in Europe and the United States.
[0022]
In the case of the radio wave correction clock, it is corrected correctly at the first correction after the change from the normal time to the summer time and after the change from the summer time to the normal time. However, on the day of transition between daylight saving time and normal time, if the operation is performed based on the flow chart in FIG. If the difference from the received time data is less than or equal to the predetermined value, it is erroneously determined that the difference is greater than the predetermined value, and the time of the internal electronic clock of the radio wave correction clock is shifted by an earlier or later time. Will happen.
[0023]
FIG. 7 shows a flowchart used in such a case, and an example of the operation will be described below. First, it is determined whether or not the time of the internal electronic timepiece has reached a predetermined automatic reception time (S31). If the time has reached the time, the reception circuit 2 is set in an operating state to receive a standard time radio wave (S32). ), It is determined whether the alarm set switch 5 is on or off (S33). If it is off, the time of the internal electronic timepiece is corrected based on the received time data (S34). On the other hand, if it is in the ON state, the received time data is compared with the time of the internal electronic clock, and it is determined whether or not the difference is not more than a predetermined value including the change time due to the shift of summer time, which is normally ± 1 hour. (S35). Specifically, when the predetermined value is 1 minute, it is determined whether the difference is ± 1 minute, or −59 to −61 minutes, or +59 to +61 minutes. If it is less than or equal to any of these predetermined values, the time of the internal electronic timepiece is corrected based on the received time data (S34). On the other hand, if the difference is greater than or equal to a predetermined value, the internal electronic timepiece continues to advance without correcting the time of the internal electronic timepiece.
[0024]
By operating in this way, when the standard time radio wave is received, the difference between the time of the internal electronic clock and the received time data when the alarm set switch 5 is in the ON state is the change time due to the shift of daylight saving time. In addition, since the time of the internal electronic timepiece is corrected when it is equal to or less than the predetermined value, the time of the internal electronic timepiece is corrected correctly without determining that it is an erroneous reception on the day of daylight saving time transition. On the other hand, since the time of the internal electronic timepiece is not corrected for other erroneous receptions, an alarm sound is generated with the accuracy of the time of the internal electronic timepiece when the alarm time is set.
[0025]
Still another operation example will be described with reference to FIG. As in the case of FIG. 2, it is determined whether or not the time of the internal electronic timepiece has reached a predetermined automatic reception time (S21). If the time has reached that time, the alarm set switch 5 is turned on or off. (S22), if it is in the OFF state, the receiving circuit 2 is set in the operating state, the standard time radio wave is received (S23), and the time of the internal electronic timepiece is corrected based on the received time data (S23). S24). On the other hand, if it is in the on state, the receiving circuit 2 is set in the operating state as before, and the reception of the standard time radio wave is started, but the reception is stopped when 0 second is detected (S25), and the second of the internal electronic timepiece is detected. Only the time is corrected (S26). For example, if the second of the internal electronic clock is 30 seconds or less (may be set to an appropriate second such as 20 seconds or less), the time of the second is corrected, such as correcting to 0 seconds. is there.
[0026]
This operation will be described in more detail. Since the standard time radio wave is set to 1 bit for 1 second and time data is transmitted in 60 seconds, in order to capture this time data, it is usually what time in seconds. First, it is necessary to detect 0 second at the start of reception. Therefore, if the reception of the standard time radio wave is terminated when 0 seconds are detected as described above, the operation time of the receiving circuit 2 is shortened and the current consumption is reduced. In addition, if the internal electronic timepiece is stepped using a normal crystal oscillator circuit, the monthly difference is about ± 20 seconds as described above, so even if reception and correction are performed about once a week, Since the correction amount is about several seconds, there is no practical problem if the error in the range of 30 seconds or less (or even 20 seconds or less) is corrected to 0 seconds as described above. Keep in mind you can use an alarm clock.
[0027]
FIG. 5 is a block diagram showing another embodiment of the present invention, and is an example in which the receiving circuit 2 is not operated when the alarm set switch 5 is in an ON state by an electric circuit as in the operation of FIG. . That is, a switch 6 for turning on and off the receiving circuit 2 is provided, and the switch 6 and the alarm set switch 5 are interlocked. In addition, although the switch 6 and the switch 7 which will be described later are a push type, the invention is not limited to this, and any type having a similar function such as a lever type, a slide type, or a rotary type may be used.
[0028]
As shown in FIG. 5, when the alarm set switch 5 is in the OFF state, the reception circuit switch 6 is ON, and when the time of the internal electronic clock reaches a predetermined automatic reception time, the reception in the ON state is performed. The circuit 2 operates to receive the standard time radio wave and correct the time of the internal electronic timepiece based on the received time data. On the contrary, when the alarm set switch 5 is on, the reception circuit switch 6 is off, and the reception circuit 2 in the off state operates even when the time of the internal electronic clock reaches a predetermined automatic reception time. Without being corrected, the time of the internal electronic clock is not corrected and continues to advance. With this configuration, the operation shown in FIG. 2 can be realized only by operating the switch without requiring complicated software.
[0029]
FIG. 6 is a block diagram showing still another embodiment of the present invention. A switch 7 interlocking with the alarm set switch 5 is provided on the signal line from the electric circuit 2 to the control circuit 1, and the alarm set switch 5 is provided by the electric circuit. In this example, the signal received by the receiving circuit 2 is not transmitted to the control circuit 1 when is on. When the alarm set switch 5 is in the on state, the switch 7 is turned off, the time data received by the receiving circuit 2 is not supplied to the control circuit 1, and the time of the internal electronic timepiece is not corrected and continues to advance. On the contrary, when the alarm set switch 5 is in the off state as shown in FIG. 6, the switch 7 is turned on, the time data received by the receiving circuit 2 is supplied to the control circuit 1, and the time of the internal electronic timepiece is set to a predetermined value. When the automatic reception time is reached, the time of the internal electronic timepiece is corrected based on the received time data. With this configuration, the operation shown in FIG. 2 can be realized only by operating the switch without requiring complicated software.
[0030]
【The invention's effect】
As described above, in the present invention, when the time of the internal electronic timepiece becomes the reception time of the standard time radio wave, the reception operation of the standard time radio wave by the receiving circuit and the internal electronic timepiece Since it can be controlled to change the time adjustment operation, it can maintain accuracy as a radio-controlled clock, and when used as an alarm clock, it eliminates anxiety about malfunction of radio wave reception and maintains accuracy as an internal electronic clock. The action can be performed. At the same time, power saving can be achieved.
[Brief description of the drawings]
FIG. 1 is a block 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 another operation of FIG. 1;
FIG. 4 is a flowchart for explaining still another operation of FIG. 1;
FIG. 5 is a block diagram showing another embodiment of the present invention.
FIG. 6 is a block diagram showing still another embodiment of the present invention.
FIG. 7 is a flowchart illustrating still another operation of FIG.
[Explanation of symbols]
1 Control circuit 2 Reception circuit 4 Time display 5 Alarm set switch

Claims (3)

A receiver circuit capable of receiving standard time radio waves;
An alarm set switch to set the alarm on / off ;
A time display unit having an internal electronic clock and displaying the time of the internal electronic clock;
And a control circuit that controls them,
The control circuit includes:
It is controllable to correct the time of the internal electronic timepiece by receiving the standard time radio wave,
When the alarm set switch is in an on state after the time of the internal electronic timepiece becomes the reception time of the standard time radio wave and the standard time radio wave is received by the reception circuit, the control circuit receives the reception An alarm clock with a radio wave correction function , wherein the time of the internal electronic timepiece is compared and the time of the internal electronic timepiece is controlled not to be corrected when the difference is equal to or greater than a predetermined value . A receiver circuit capable of receiving standard time radio waves;
An alarm set switch to set the alarm on / off;
A time display unit having an internal electronic clock and displaying the time of the internal electronic clock;
And a control circuit that controls them,
The control circuit includes:
It is controllable to correct the time of the internal electronic timepiece by receiving the standard time radio wave,
When the time of the internal electronic timepiece has reached the reception time of the standard time radio wave and the alarm set switch is in an on state, the control circuit is configured to receive only 0 second of the standard time radio wave by the reception circuit. An alarm clock with a radio wave correction function, wherein the alarm clock is controlled to detect and receive and to correct the time of the internal electronic clock. A receiver circuit capable of receiving standard time radio waves;
An alarm set switch to set the alarm on / off;
A time display unit having an internal electronic clock and displaying the time of the internal electronic clock;
And a control circuit that controls them,
The control circuit includes:
It is controllable to correct the time of the internal electronic timepiece by receiving the standard time radio wave,
When the alarm set switch is in an on state after the time of the internal electronic timepiece becomes the reception time of the standard time radio wave and the standard time radio wave is received by the reception circuit, the control circuit receives the reception And the time of the internal electronic timepiece is compared, and if the difference is less than or equal to the first predetermined value, or the difference including the change time expected due to the shift to daylight saving time is less than or equal to the second predetermined value In this case, the alarm clock with a radio wave correction function is controlled to correct the time of the internal electronic clock.

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