JPS6110225Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electronic alarm clock, and more particularly to an improvement in an electronic alarm clock that can prohibit the sounding of an alarm even when a set alarm time arrives.

Equipped with an electronic circuit with low power consumption and a sound generation mechanism,
Electronic alarm watches powered by small batteries have already been put into practical use, and recently, electronic alarm watches that use liquid crystal display devices for their display sections have also been put into practical use. These alarm clocks are more complicated to use than ordinary clocks, so various ways of controlling them from the outside have been devised. One of the operational improvements is an alarm disable mechanism. This is a mechanism that prohibits the alarm from sounding even when a set time has arrived, and is configured so that the alarm can be prohibited or canceled by arbitrary external operations. This mechanism is useful, for example, in the following ways. That is, if you want the alarm to sound at a fixed time every day on weekdays, but not on holidays, you can disable the alarm the day before the holiday and the alarm will not sound on holidays.
Next, if the alarm prohibition is canceled at an appropriate time on a holiday, the alarm will sound again from the next day. The alarm prohibition mechanism thus provides a convenient way to use an alarm clock and is highly effective.

Although the alarm inhibiting mechanism is a convenient mechanism as described above, conventional electronic alarm clocks equipped with the alarm inhibiting mechanism have the following drawbacks. That is, in the past, the alarm prohibition mechanism was unrelated to the alarm time setting mechanism, so if the alarm time was set to a new time in the alarm prohibition state, the alarm prohibition state was maintained as is. This is accompanied by the following inconveniences in use. That is, when setting the alarm time to a new time, in most cases the user intends for the alarm to sound at the set time. Therefore, in this case, the user must set the alarm time and check whether or not the alarm prohibition has been canceled, and if the alarm prohibition has been disabled, the user must cancel the alarm prohibition. If you forget to cancel the alarm prohibition, the alarm will not sound. Conventional watches had the following drawbacks.

Therefore, the present invention is an attempt to solve the above-mentioned conventional drawbacks, and is designed to automatically cancel the alarm prohibition when the alarm time setting operation is performed.

The present invention will be described in detail below with reference to Examples.

FIG. 1 is a circuit block diagram of an electronic alarm clock according to the present invention, in which 1 is an electronic circuit section, 2 is a display section using liquid crystal, light emitting diode, etc., 3 is a sounding section, and 4 is an external operation section. In the electronic circuit section 1, 5 is a clock circuit section, which is a known circuit consisting of a crystal oscillation circuit, a frequency dividing circuit, a counting circuit, a display drive circuit, an alarm time storage circuit, an alarm time detection circuit, etc. is omitted here.
Reference numeral 6 denotes an operation circuit which inputs a switch signal generated by the external operation section 4 and outputs an external operation signal to a predetermined circuit. 7 is an alarm prohibition circuit, and 8 is a sound generation section drive circuit. The external operation section 4 includes, for example, three switches 9, 10, 11 and push buttons (not shown) for opening and closing these switches.

FIG. 2 is a circuit diagram showing a part of FIG. 1 in detail. 21 is a NAND gate included in the operation circuit 6; 22 is a T gate included in the alarm prohibition circuit 7;
23 is an AND gate included in the sound generation section drive circuit 8, and 24 is a transistor also included in the sound generation section drive circuit 8. The NAND gate 21 receives a switch signal generated by the switch 11 as one input, and receives a signal line 31 connected to a predetermined signal output of the operating circuit 6 as the other input. The output of NAND gate 21 is connected to the T input (T) of T-type flip-flop 22.
The set input (S) of the T-type flip-flop 22 is connected to a predetermined signal output of the operating circuit 4 by a signal line 32. The AND gate 23 has three input terminals, the first input receives the output (Q) of the T-type flip-flop 22, and the second input receives the sound frequency signal from the clock circuit 5 via the signal line 33. , the third input is connected to the clock circuit 5 by a signal line 34.
Input the pronunciation command signal from. AND gate 23
The output of is connected to the base of transistor 24. The emitter of the transistor 24 is connected to ground, and the collector is connected to a positive power supply potential (+V) via the sound generating section 3.

Next, the operation of the circuit shown in FIG. 2 will be explained. Signal line 3
1 receives a signal generated in response to the operation of switch 9 or 10. Signal line 31 is HIGH
At this time, the NAND gate 21 is opened, and in response to the opening/closing operation of the switch 11, a trigger signal is sent from the NAND gate 21 to the T input of the T-type flip-flop 22, and in response to this trigger signal, the output of the T-type flip-flop is Q repeats HIGH and LOW alternately. The Q output of T-type flip-flop 22 is
When the signal line 34 is HIGH, the alarm prohibition is canceled. When the signal line 34 becomes HIGH at the same time as the alarm time is detected, the sound frequency signal sent from the signal line 33 passes through the AND gate 23, and this signal causes the transistor to be activated. 24 is turned on and off periodically,
The sound generating unit 3 generates sound. T-type flip-flop 22
When the output Q of is LOW, the alarm is prohibited and the AND gate 23 is closed, so even if the signal line 34 becomes HIGH, the output of the AND gate 23 is
Since the signal remains at LOW, the sound generating section 3 does not produce sound.
In this manner, by arbitrarily operating the switch 11, one of the two states of alarm prohibition and alarm prohibition cancellation can be selected. switch 9
Alternatively, when the alarm time is set by operating 10, a pulse is sent to the signal line 32, and the output Q of the T-type flip-flop 22 is set to HIGH. This operation is independent of whether the output Q of the T flip-flop was previously HIGH or LOW. Therefore, when a new alarm time is set, the alarm prohibition release state is automatically set in accordance with the operation.

As explained above, according to the present invention, in an electronic alarm clock equipped with an alarm prohibition mechanism, when the alarm time is set, the alarm prohibition state is automatically set. When setting the time, there is no need to check whether the alarm is disabled or disabled. Further, the present invention does not impair the conventional alarm inhibiting mechanism in any way. Thus, the present invention improves the usage of electronic alarm clocks, and the present invention makes electronic alarm clocks more convenient.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of an electronic alarm clock according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a part of FIG. 1 in detail. 1...Electronic circuit section, 2...Display section, 3...Sound generation section, 4...External operation section, 7...Alarm prohibition circuit, 22...T-type flip-flop.

Claims (1)

[Scope of utility model registration request] An electronic alarm clock comprising an electronic circuit section, a display section connected to the electronic circuit section, a sounding section, and an external operation section that outputs a setting signal to the electronic circuit section when setting an alarm time. The unit includes an alarm prohibition circuit for inhibiting or canceling the prohibition of sound generation by the sound generation unit, and the alarm prohibition circuit includes a flip-flop that inputs the setting signal output from the external operation unit to set the output, and a flip-flop that sets the output by inputting the setting signal output from the external operation unit. 1. An electronic alarm clock comprising means for canceling the prohibition of sounding by the sounding section by an output when the sounding section is set.