JPS59211887A - Electronic timepiece - Google Patents

Abstract

PURPOSE:To attain to reduce power consumption during an unused period such as during a stock period, by fixing the oscillation inverter input of a crystal oscillation circuit to constant potential by external operation. CONSTITUTION:When an external operation member 11 is short-circuited, one signal of crystal vibrators 2 is fixed to one potential of a battery 5 and an integrated circuit 3 stops all operations including a crystal oscillator circuit to sufficiently conserve power consumption. Therefore, the reduction in power consumption during an unused period such as during a stock period is achived and the battery life of an electronic timepiece is elongated.

Description

[Detailed description of the invention] The present invention relates to an electronic watch with a power saving function.

Conventionally, as a means to save power consumption of electronic watches that are powered entirely by batteries, in electronic watches equipped with optical display elements, it is possible to reduce the power consumption by stopping the driving of the optical display elements. In electronic watches with a hand movement display structure,
Means for saving power consumption by stopping the logic operation of all integrated circuits except for the oscillation circuit and stopping the movement of the hands using a reset function is already known and implemented.

However, especially in the latter case, very low power consumption integrated circuits have been developed in recent years, and all integrated circuits except oscillator circuits, which can be saved by operating the power reset function, The power consumption is less significant than the power consumption due to the input current of the reset input terminal. Moreover, in electronic watches whose hand movements have long intervals of several tens of seconds or more, it is no longer meaningful to save driving power by stopping the hand movement by reset f7ffl (even at the time of market shipment, reset @ function is not recommended). Therefore, under the current situation, the battery life is short during the period when the end user obtains the ox, and the battery life during use is shortened. had a drawback that was significantly different from the life performance of the main bed. = The present invention
The purpose is to eliminate the above-mentioned drawbacks and to further save power consumption when not in use, such as during inventory periods, and to compensate for battery life.

Hereinafter, the practical aspects of the present invention will be explained with reference to the drawings. 11th
is a circuit block diagram showing one embodiment of the present invention;
In the figure, 1 is an external operating member, 2 is a crystal pendulum, and 3 is a crystal oscillation circuit. Frequency divider circuit. A collection circuit including a drive circuit, 4 a time display mechanism, and 5 a battery. In FIG. 1, during normal use, the external operating member 1 is in an open state, and the integrated circuit 3
( performs a logical operation and displays the time by the time display mechanism 4.

On the other hand, when saving power, which is the gist of the invention, the signal on one side of the crystal resonator 20 is fixed at the potential on one side of the battery 5 by short-circuiting the external operating member 1. As a result, the integrated circuit 3 stops all operations including the crystal oscillation circuit. Therefore, it is possible to save power consumption compared to the conventional method.

FIG. 2 is a diagram illustrating in detail the four-wire crystal circuit 31 included in the integrated circuit 3 in FIG. In Figure 2,
Reference numeral 311 represents an oscillation inverter, 311α represents an N-c IL ) transistor of the oscillation inverter 311, and 312 represents a feedback resistor. 7c32 is a frequency dividing circuit, and 33 is a driving circuit. Here, the implementation of invention X will be explained in detail with reference to FIG. In FIG. 2, when the external operating member 1 is short-circuited to save power consumption, the oscillation inverter 311ON=
The Ch transistor 311α becomes ON state, and the external operation member 1→feedback resistor 312→N-ch transistor 311
A current path C is created. However, the resistance value of the feedback resistor 312 is normally set to a very large value of several tens of megaohms! C,
The power consumption in this current path is very small compared to the power consumption of the crystal oscillation circuit 31 during normal operation. Therefore, the power saving effectiveness of the present invention is fully guaranteed.

In addition, according to this embodiment, an example has been given in which the input signal of the oscillation inverter 3110 is fixed at one potential of the battery 5, but the fixed potential is not limited to this. Furthermore, as an example of the crystal oscillation circuit 31, a simple inverter type oscillation circuit was mentioned, but this
Limited to! There's nothing to do.

As described above, according to the invention, all logic operations of the integrated circuit are stopped by fixing the input signal of the oscillation inverter of the crystal oscillation circuit to a constant potential using an external operating member. 'OL rice reset I) Aa
Compared to electronic watches that have a single clock, it is possible to further save power consumption when not in use, and it also has the effect of compensating for battery preloading when in use.

[Brief explanation of the drawing]

FIG. 1 shows a circuit block diagram showing one embodiment of the present invention. Figure 2 shows the crystal oscillation circuit rs in the integrated circuit in Figure 1.
A block diagram of the circuit described in full detail is shown. a+4°. External operating member 20. Crystal oscillator 3.8 Integrated circuit 4.9 Time display mechanism 5. 'r in the pond 31 * *Crystal launch circuit 311,. oscillation inverter

Claims (1)

[Claims] In an electronic watch that is powered by a battery and that supports a crystal oscillation circuit, a frequency dividing circuit, a drive circuit, and a time display mechanism driven by the drive circuit, the input signal of the oscillation inverter of the crystal oscillation circuit is kept at a constant potential. An electronic timepiece characterized by having an external operating member fixed therein.