Temperature compensated electronic timepiece

Details Temperature compensated electronic timepiece Temperature compensated electronic timepiece

1975-12-29

1976-12-28

Weldon, Ulysses

Oscillators

Relaxation oscillators

58 23A, 331176, G04C 300

Patent

active

039993701

ABSTRACT:
An electronic timepiece has an oscillator whose frequency varies with temperature and whose output is fed through an adder to a time-count unit-signal former that divides this output and feeds it through a counter to a time display. A plurality of transistors are biased so as to switch between conductive and nonconductive states at different respective temperatures, this biasing being effected by means of one resistor or a string of series-connected resistors connected across a constant-voltage source. The transistors are connected to a converter which translates their changes of state into a coded digital signal which is combined with signals from the unit-signal former and fed to the adder to vary the oscillator output frequency in such a manner as to compensate for frequency variations caused by temperature change.

REFERENCES:
patent: 2811647 (1957-10-01), Nilssen
patent: 3388344 (1968-06-01), West
patent: 3526853 (1970-09-01), Vittoz
patent: 3531739 (1970-09-01), Groves
patent: 3690546 (1972-09-01), Uehara
patent: 3713033 (1973-01-01), Frerking
patent: 3719838 (1973-03-01), Peduto et al.
patent: 3800523 (1974-04-01), Yamazaki

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