Electronic timepiece with illumination lamp battery voltage drop

Details Electronic timepiece with illumination lamp battery voltage drop Electronic timepiece with illumination lamp battery voltage drop

1980-04-18

1982-05-04

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With auxiliary illumination for display

368 73, 368156, 368204, 331116FE, 331176, G04B 1930, G04B 2302, G04F 500, H03B 530

Patent

active

043285708

ABSTRACT:
In an electronic timepiece having a quartz crystal controlled standard frequency oscillator and a device which temporarily imposes a heavy load on the battery when activated, means are provided for changing a value of a circuit constant in the oscillator circuit, such as capacitance or resistance, when the load device is activated. This change in circuit constant value serves to decrease the value of the minimum battery supply voltage below which the oscillator circuit ceases to function, thereby ensuring reliable operation of the oscillator circuit when the timepiece battery voltage drops due to current being supplied to the load device.

REFERENCES:
patent: 4064468 (1977-12-01), Kumata
patent: 4091611 (1978-05-01), Fukuichi
patent: 4131864 (1978-12-01), Kuzumoto et al.

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