JPS5815187A - Multi-function electronic clock - Google Patents

Abstract

PURPOSE:To stabilize start of oscillation, by inhibiting heavy load driving for a constant interval of time when starting the oscillation, and preventing a supply voltage drop. CONSTITUTION:When a circuit 7 for detecting turn-on of an electric power supply, or oscillation stop of an oscillating circuit 1 detects each state, timing circuits 8, 9 are reset, and a driving signal 5 to a heavy load device 6 such as a lighting equipment, a sound generating device, etc. is obstructed. Subsequently, until a constant interval of time passes after reset of the timing circuits 8, 9 have been released, it is continuously obstructed to supply the driving signal 5 to the heavy load device 6, by which a drop of supply voltage can be prevented. Accordingly, start of the oscillating circuit 1 is executed stably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic timepiece having a heavy load device, and more particularly to a heavy load controller at the time of starting oscillation of an oscillation circuit that generates a signal serving as a time standard for the electronic timepiece.

An object of the present invention is to obtain a heavy load single control system for reliably starting oscillation of an oscillation circuit.

Conventionally, in an electronic timepiece having a heavy load device, heavy load control has not been performed at the time of starting oscillation by turning on the power or the like. Therefore, the heavy load device may start driving before the oscillation stabilizes. Recently, electronic watches have become smaller and thinner, and along with this, batteries used as power sources have also become smaller and thinner, and this trend has become particularly strong in electronic wristwatches. Such a battery has a high internal impedance, and when a large current such as that used to drive a heavy load device is passed through the battery, a voltage drop occurs. Therefore, if a heavy load device starts driving and a power supply voltage drop occurs before the oscillation is stabilized, the oscillation may become unstable or stop. At particularly low temperatures, this risk increases because the battery's internal impedance increases.

The present invention eliminates such problems and provides a method for starting stable oscillation, and will be described in detail below with reference to the drawings.

FIG. 1 shows an example of the configuration of an electronic circuit of an electronic timepiece according to the present invention.

In Figure 1, numeral 2 is an oscillation circuit that generates a time standard signal, and numeral 2 is a frequency divider circuit that divides the time standard signal into 1
A time counter group 3 generates a signal (02) with a second period, and measures time using a signal with a one second period. Reference numeral 4 denotes a function control circuit, which controls various functions of the electronic watch, including heavy load devices such as lighting devices and sound generators, and also generates drive signals 5 for each heavy load device. 6 is a heavy load device, which operates when the input is logic "1". Reference numeral 7 denotes a puff/on detection circuit for detecting power-on or an oscillation stop detection circuit for detecting the stop of oscillation, which outputs rOJ when detecting a failed state. 8 and! are D type-7 Lip, 7 Hyp 8 (hereinafter referred to as 1F), respectively.
/ IF), a master type Hibiki latch 9, and a 1-second periodic signal (ob) obtained from the frequency divider circuit 2.
2 is a timing ψ chart of the circuit shown in FIG. 1.

In Fig. 2, OL is 1 obtained from frequency divider circuit '2.
Second period signal, i is the output of the detection circuit 7, 7/? of 8? ,
This is a reset signal for 9 latches, and 9 sets are applied to each of them at logic "0". Each is the output of 1/v of 8, and the other is the output of the latch of 9. When the reset signal i is rOJ, the bottom is also "0", and after i becomes "1", the timer circuit consisting of 8.9 is used for at least t seconds (t<1) , M is rOJ'
During the period in which the determined 0M is rOJ, the heavy load drive signal 5 is 1'0 and is inhibited by the page II) gate 11, so Afi of the heavy load device 6 becomes rOJ and the heavy load is not driven.

As described above, according to the present invention, heavy load driving can be prohibited for a certain period of time at the start of oscillation to prevent power supply voltage drop.
It becomes possible to start stable oscillation. Furthermore, even if the heavy load driving prohibition time is changed depending on the characteristics of the oscillation circuit, this can be easily applied by making slight changes to the tights circuit. Furthermore, the timer circuit used is not limited to this embodiment, and various tie circuits may be used to implement the present invention.
It is possible to use two circuits.

[Brief explanation of drawings]

Figure 1: Example of the electronic circuit configuration of an electronic watch according to the present invention Figure 2: Tizing and charging of the circuit shown in Figure 1 Applicant: Suwa Seikosha Co., Ltd. Agent Patent Attorney Mogami duties

Claims (1)

[Claims] Among the heavy loads of lighting equipment and sound generation equipment,
What is claimed is: 1. A multi-function electronic timepiece comprising: a heavy load driving prohibition circuit that prohibits driving of the heavy load for a certain period of time when an oscillation circuit that generates a time standard signal starts oscillating;