Quartz crystal electronic timepiece

Details Quartz crystal electronic timepiece Quartz crystal electronic timepiece

Filed on

1974-07-22

Date issued

1976-09-07

Examiner

Weldon, Ulysses

Other Related Categories

58 855, G04C 300

Type

Patent

Status

active

Patent number

039786498

Description

ABSTRACT:
An electronic timepiece having a quartz crystal oscillator circuit adapted to be tuned to a reference frequency or a reference frequency minus mHz, where m is an integer and a divider circuit adapted to produce a predetermined timekeeping signal is provided. The divider circuit includes a plurality of divider stages, the number of divider stages determining a division ratio to produce the predetermined low frequency signal in response to the high frequency reference signal. An adjustment circuit is coupled to the divider circuit, the adjustment circuit being adapted to adjust the division ratio of the plurality of divider stages to thereby generate the predetermined frequency when the oscillator circuit is tuned to the high frequency reference signal minus mHz.

REFERENCES:
patent: 3530663 (1970-09-01), Marti
patent: 3540207 (1970-11-01), Keeler
patent: 3541779 (1970-11-01), Langley
patent: 3629582 (1971-12-01), Koehler
patent: 3777471 (1973-12-01), Koehler et al.
patent: 3812669 (1974-05-01), Wiget
patent: 3812670 (1974-05-01), Nikaido et al.

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