JPH0313756Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to an alarm clock.

[Prior art] Conventional analog alarm clocks generate an alarm sound when the alarm switch is closed, and if the alarm is not turned off, the alarm will continue to sound for several tens of minutes while the alarm switch is closed. Let go. Since the current consumption at this time becomes a big problem, devices equipped with a so-called auto-stop function have been devised. This uses a counter to measure the duration of the alarm sound, and automatically stops the alarm sound after a certain period of time has elapsed.

[Problems that the invention aims to solve] Simply adding an auto-stop function will not work.
I didn't realize that I had forgotten to turn off the alarm, and when the alarm switch was activated again, the alarm would start sounding again.

Therefore, the present invention is designed to prompt the alarm switch to stop ringing by notifying the user that the alarm switch has forgotten to turn off when it becomes inactive, thereby preventing current consumption.

[Means for solving the problem] The present invention is provided with a notification control circuit that generates a notification sound when the alarm switch becomes inoperable after the alarm sound is automatically stopped by the control circuit. be.

[Example] In FIG. 1, 1 and 2 are counters for auto-stop, 3 is a one-shot circuit, 4 to 8 are flip-flop circuits, 9 to 13 are gate circuits, and the output of the gate circuit 13 is an alarm sound generator ( (not shown) are connected. 14 is an inverter;
15 is an alarm switch, and 16 is a silence switch.

Next, the operation will be explained with reference to the time chart shown in FIG. When either switch 15 or 16 is open, the output of flip-flop circuit 5 is held at "1" and the output of gate circuit 12 is held at "0". Further, the output Q of the flip-flop circuit 8 is also held at "0", and the output of the gate circuit 13 is held at "0", so that no alarm sound is generated.

Then, when switches 15 and 16 are closed, terminal a
is inverted to "1" as shown in FIG. 2a, and the output Q of the flip-flop circuit 4 is inverted to "1" as shown in FIG. 2c by the fall of the clock pulse from terminal b. After one clock delay, the output of the flip-flop circuit 5 becomes "0" as shown in Figure 2d.
to be reversed. Therefore, the output of the gate circuit 12 is inverted to "1" as shown in FIG.
The output of is inverted to "1" as shown in FIG. 2, p, and an alarm sound is generated.

On the other hand, one pulse is generated from the gate circuit 9 as shown in FIG. 2e, and the counters 1 and 2 are reset.
Start counting the duration of the alarm sound. If the sound is left as it is without stopping the ringing, after a few minutes the counter 2 will generate an output as shown in FIG. 2i, and the one-shot circuit 3 will generate one pulse as shown in FIG. 2j. The flip-flop circuit 6 is triggered by the rising edge of this pulse, and its output Q becomes the second flip-flop circuit.
It is inverted to "1" as shown in figure k. Therefore, the output of the gate circuit 12 is inverted to "0" and the alarm sound stops sounding. In other words, the alarm sound is automatically stopped.

By the way, the flip-flop circuit 7 is triggered by the fall of the pulse from the one-shot circuit 3, and its output Q is inverted to "1" as shown in FIG. When more time passes in this state and the alarm switch 15 is opened, the output Q of the flip-flop circuit 4 is inverted to "0", and then the output of the flip-flop circuit 5 is inverted to "1". Therefore, one pulse is generated from the gate circuit 10 as shown in FIG. 2f. The flip-flop circuit 8 is triggered by the falling edge of this pulse, and its output Q
is inverted to "1" as shown in Fig. 2 o. Thereafter, when the counter 1 generates an output as shown in FIG. 2h, the flip-flop circuit 8 is reset and its output Q is inverted to "0". Therefore, one pulse is generated from the flip-flop circuit 8 as shown in FIG. 2, and an alarm sound is generated thereby.

If the alarm sound is not turned off in this manner, when the alarm switch 15 is opened, the alarm sound is generated for a short period of time to notify that the alarm sound has not been turned off.

By the way, if the alarm sound is stopped by the switch 16 before the alarm sound is automatically stopped by the output from the counter 2, the output of the flip-flop circuit 5 is reversed to "1" and the alarm sound is stopped. do. Further, a pulse is generated from the gate circuit 10 in the same manner as above, but at this time, the output of the flip-flop circuit 7 is held at "0", so
The output of the flip-flop circuit 8 is also held at "0". Therefore, in this case, no pulse is generated from the flip-flop circuit 8.

If the alarm is stopped after the automatic stop is performed by the output of the counter 2, but before the alarm switch is opened, the flip-flop circuit 8 generates one pulse in the same way as above, and the alarm sounds. Occurs for a short period of time. The sound at this time becomes a confirmation sound for the operation to stop the sound, and it can be confirmed that the sound has been stopped reliably, giving the user a sense of security.

[Effects of the invention] According to the invention, if the alarm sound is not stopped automatically and the alarm sound is automatically stopped, the alarm sound is generated for a certain period of time when the alarm switch becomes inactive. Therefore, it is possible to warn that the user has forgotten to turn off the alarm, and to prompt the operator to turn off the alarm, thereby suppressing wasteful current consumption.

In addition, even if you perform a mute operation after the alarm sound is automatically stopped and before the alarm switch is deactivated, the alarm sound will be generated for a certain period of time, allowing you to confirm that the alarm has been muted. It can give the user a sense of security.

[Brief explanation of the drawing]

FIG. 1 is a logic circuit diagram showing an embodiment of the present invention, and FIG. 2 is a time chart for explaining the operation. 1, 2...Frequency divider, 4-8...Flip-flop circuit, 9-13...Gate circuit, 15...Alarm switch, 16...Sound stop switch.

Claims (1)

[Scope of utility model registration request] An alarm switch that operates at a set time, an alarm device that generates an alarm sound by the operation of the alarm switch, a clock circuit that clocks the time when the alarm sound is generated by the alarm device, and a time that is set in advance by this clock circuit. A control circuit that causes the alarm device to stop generating an alarm sound based on the output when the alarm switch is timed; and a control circuit that makes a notification sound for a certain period of time when the alarm switch becomes inoperable after the control circuit stops generating the alarm sound. An alarm clock consisting of an alarm control circuit that generates an alarm.