JPS60127483A - Electronic watch - Google Patents

Abstract

PURPOSE:To enable normal operation even under intensive light, by changing over the voltage of a battery and low voltage generated in a low voltage generating circuit by a light sensor circuit. CONSTITUTION:When a light sensor circuit 2 senses no light, the output ''0'' thereof sets the output of an inverter 3 to ''1'' to bring MOSFET4 to a continuity state and low voltage generated by a low voltage generating circuit 6 is supplied to a low voltage operation circuit 7 but MOSFET5 is under a discontinuity state and the voltage of a battery is not supplied to the circuit 7. On the other hand, when the circuit 2 senses light, the output thereof comes to ''1'' while FET5 is brought to a continuity state and the voltage of the battert is supplied to the circuit 7 but the output of the inverter 3 comes to ''0'' and FET4 is brought to a discontinuity state and low voltage generated by the circuit 6 is not supplied to the circuit 7. Therefore, the consumption of a current is usually low and normal operation can be performed even under intensive light.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a 4J,!, which has a low voltage generation circuit for supplying a voltage lower than the battery voltage to some circuits in a portable electronic watch. This is related to obi-ji.

In order to extend the life of the battery, the mobile "FK+" watch adopts a method of suppressing the current consumption of the electronic port f11.In particular, in order to reduce the current consumption of the electronic circuit, , low′
– Oscillator circuits and some frequency divider circuits that operate even under pressure (
Hereinafter, there is a portable electronic watch that has a low voltage generation circuit for supplying a voltage lower than the battery voltage to a low voltage operation circuit. However, when this low voltage generation circuit is irradiated with light, a voltage drop phenomenon occurs, and the generated low voltage becomes a voltage lower than the voltage at which the low voltage operation circuit can operate, and this low voltage operation circuit stops operating, causing electronic The clock no longer works properly. Therefore, although an electronic circuit normally operates normally when incorporated into a watch body, it has a drawback that it does not operate normally when used in a bright place.

SUMMARY OF THE INVENTION In order to solve such drawbacks, the present invention aims to provide a low current consumption portable electronic watch that operates normally even in extremely bright places, and includes a light sensing circuit, a low voltage generation circuit, and a light sensing circuit. This portable electronic timepiece is characterized by having a circuit that detects light and switches the low voltage supplied to the low voltage operation circuit to battery voltage.

FIG. 1 shows one embodiment of the present invention, in which 1 is an electronic circuit for a watch, 2 is a photodetection circuit, 3 is an inverter, and 4 and 5 are MOSFETs.
S-Fl! iT, 6 is a low voltage generation circuit, 7 is a low voltage operation circuit, 8 is a battery voltage operation circuit, and 9 is a battery. When the light detection circuit 2 does not sense light, its output is 0 (LOW
), and when light is detected, the output is 1 (HIGH)
becomes. When the photodetector circuit 2 does not detect 0, its output 0 becomes the input to the inverter 3, and the output of the inverter 3 becomes 1, and the MOS-FET 4 becomes 4-wire, and the low voltage operation circuit 2 generates a signal. The resulting low voltage is supplied to the low voltage operation circuit 7. At this time, )i O5OFET5
Since is in a non-conducting state, the battery voltage is not supplied to the low voltage operation circuit 7. Conversely, when the photodetector circuit 2 senses light, its output becomes 1, and MOS -FET
5 becomes conductive, and the low voltage operation circuit 7 is supplied with battery voltage. At this time, the output of the inverter 3 becomes 0, the MOS-FET 4 becomes non-conductive, and the low voltage operation circuit 7 is not supplied with the low voltage generated by the low voltage operation circuit B. Photodetection circuit 2. low voltage generation circuit 6,
The battery voltage operating planes V+S 8 are each supplied with battery voltage from the battery 9 and operate.

Since the portable electronic watch of the present invention supplies a voltage lower than the battery voltage to the low-voltage operation circuit, when it is incorporated into a normal watch body, it operates normally with low current consumption, and when it senses light. Since the low voltage is switched to the battery voltage and supplied to the low voltage operating circuit, it can operate normally even under strong light.

Therefore, it is possible to provide a portable electronic watch that normally consumes low current and operates normally even under strong light.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the portable electronic timepiece of the present invention. 1...... Watch electronic circuit 2... Photo detection circuit 6... Inverter 4, . 5-...M OS-FET6...
...Low voltage generation circuit 7...Low voltage operating circuit 8...Battery voltage operating circuit 9...
...Battery Applicant Suwa Seiko Co., Ltd. Agent Patent Attorney ノυ上「■ 【□

Claims (1)

[Claims] 1. A portable electronic timepiece characterized by comprising a source sensing circuit, a low voltage generating circuit, and a circuit for switching between a battery voltage and a low voltage generated by the low voltage generating circuit using the light sensing circuit.