JPH0351789A - Alarm apparatus of electronic time-piece - Google Patents

Abstract

PURPOSE:To prevent the wasteful consumption of the power of a power supply and to extend the life of a time-piece by providing a detector detecting the voltage of the power supply and detecting the voltage of the power supply at the time of the driving of a soundless alarm. CONSTITUTION:In an electronic time-piece, when a signal A is outputted from an alarm control circuit 4, the output of a selection circuit 2 is set to phi=Hphi2=L when the output signal B of an alarm change-over circuit 3 is an H-level and a sound emitting alarm driving control circuit 6 is selected to drive a sound emitting alarm. When the output signal B of the alarm change- over circuit 3 is an L-level, the output of the selection circuit 2 is set to phi1=Lphi2=H and the sound emitting alarm driving control circuit 6 is selected to drive the sound emitting alarm. When the output signal B of the alarm change-over circuit 3 is an L-level, a soundless alarm driving control circuit 5 is selected to drive a soundless alarm but, when the value obtained by dividing the voltage of a power supply becomes lower than the output of a constant voltage circuit 1-1, a voltage comparator 1-2 outputs an H-level and the driving of the soundless alarm is stopped while the sound emitting alarm is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an alarm device for an electronic watch with an alarm function.

[Summary of the invention]

The present invention is an electronic watch with an alarm that has two alarm functions: a sound alarm and a silent alarm.The present invention detects the power supply voltage when the silent alarm is activated, and according to the detection result, prohibits the activation of the silent alarm and switches to the active alarm. This prevents wasteful consumption of power from the power source.

[Conventional technology]

Conventionally, the majority of alarms in electronic watches with an alarm function have been audible alarms that use an oscillating sound from a piezoelectric buzzer, etc., while silent alarms use a motor, as shown in Figure 2, and are centered around the shaft of the drive motor 13. The vibrating part 12 vibrates due to the eccentric movement of the rotary body 11 which is fixed with a shift in position, and the vibration is sensed by the human body. [Problem to be solved by the invention] However, the silent alarm using the above motor , which requires more power than that required to drive a sound alarm such as a piezoelectric buzzer.

Therefore, when driving with a power source with limited power capacity, there is a situation where the power is insufficient to drive a silent alarm, but there is sufficient power remaining to drive a sound alarm.

In this case, if the silent alarm is activated, the closed circuit voltage of the power supply will suddenly decrease, causing the clock system to stop, resulting in a shortened service life.

[Means to solve the problem]

In order to solve the above problems, in the present invention, electric a
By providing a voltage detector and detecting the power supply voltage when driving a silent alarm, wasteful consumption of electric power is prevented and the life of the electronic watch with an alarm function is extended.

[Effect]

In the alarm device configured as above, when the alarm drive time is reached when the silent alarm function is selected, the closed circuit voltage of the power supply voltage is detected, and if the closed circuit voltage is equal to or higher than the set voltage value that drives the silent alarm, For example, if driving is permitted and the detected voltage falls even slightly below the set voltage, driving of the silent alarm can be immediately stopped and switched to a sounding alarm, which consumes far less power than the silent alarm.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. 1st
In the figure, the selection circuit 2 is connected to the alarm control circuit 4, the alarm switching circuit 3, and the voltage detection circuit 1, and the output of the selection circuit 2 is connected to the sound alarm drive control circuit 6 and the silent alarm drive control circuit 5. The outputs of the sound alarm drive control circuit 6 and the silent alarm drive control circuit 5 are
Via the drive driver 9, the audible alarm unit 7
is input to the silence alarm unit 8. The operation of the selection circuit 2 is shown in FIGS. 3 and 4. In FIG. 3, when the alarm setting time and the current time match, the alarm control circuit 4 outputs the signal A. When the output signal B of the alarm switching circuit 3 is at H level, the output of the selection circuit 2 is φ1-Hφ2-L, and the sound alarm drive control circuit 6
When the output signal B of the zero-order alarm switching circuit 3 is at L level, the output of the selection circuit 2 is φl=L and φ2=H, and the silent alarm drive control circuit 5 is selected. However, if the value obtained by dividing the power supply voltage becomes lower than the output of the constant voltage circuit 1-1, the voltage comparator 1-2 outputs an H level and receives it. Then, with φ1=H7φ2=L, the silent alarm drive is stopped and the sound alarm is selected.

〔Effect of the invention〕

As explained above, the present invention detects the closed circuit voltage of the power supply voltage when the alarm drive time is reached when the silent alarm function is selected, and if the detected voltage is equal to or higher than the set voltage value that drives the silent alarm , if the detected voltage is even slightly below the set voltage, the silent alarm is immediately stopped and switched to the audible alarm, which consumes far less power than the silent alarm, so the power capacity is limited. If the device is powered by a power source with a high power supply, the life of the power source can be extended.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the alarm device of the present invention, Fig. 2 is a sectional view of a conventional vibrating silent alarm, Fig. 3 is a selection circuit diagram of the alarm device of the invention, and Fig. 4 is a selection circuit of the invention. FIG. 5 is another selection circuit diagram of the alarm device of the present invention. Voltage detection circuit selection circuit Alarm switching circuit Alarm control circuit Silent alarm drive control circuit Sound alarm drive control circuit...Sound alarm section...Silent alarm section...Drive driver bart...Constant voltage circuit-2...・Voltage comparator

Claims (1)

[Claims] (1) At least an oscillation circuit, a frequency dividing circuit that divides the output of the oscillation circuit, means for generating several types of timing pulses from the output of the frequency dividing circuit, means for counting time, and storing time. An electronic timepiece having means for controlling and driving an alarm, comprising two alarm output means for a sound alarm and a silent alarm, an alarm switching circuit for switching between the sound alarm and the silent alarm, and the alarm switching circuit. a voltage detection circuit that detects a power supply voltage when the silent alarm is driven; and an output of the voltage detection circuit to stop driving the silent alarm;
a selection circuit that selects whether to drive the sound alarm or drive the silent alarm;
An alarm device for an electronic watch comprising a sound alarm control circuit and a silent alarm control circuit that control driving of the sound alarm and the silent alarm.