Title: Device for maintaining the oscillation of a balance for a timepiece

Abstract: The device comprises a balance having two magnets attached thereto, a coil combining pick-up and driving functions, two complementary transistors, an RC circuit formed of a speed-up first condenser and a first resistor, a biasing second resistor, a coupling second condenser a third resistor and a third condenser. This device is capable of operating over a wide temperature range, is less influenced by the deviation generally seen in the commercially available transistors, is simplified in construction, is inexpensive to manufacture and is adapted for mass production.

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Inventors: Ishizuka, Tsutomu (Noda, JA)
Ichikawa, Seiji (Aizuwakamatsu, JA)

Application Number: 558857
Filing Date: 1975-03-17
Publication_date: 1977-03-15
Assignee: Rhythm Watch Co. Ltd. ()
Primary Class(es): 368/158 331/116M, 368/163, 968/479, 968/DIG1
Other Classes:
US Patent Ref:

3238431	Mar, 1966	Raval	58/28.
3365635	Jan, 1968	Shelley	58/23.
3646750	Mar, 1972	Reich	58/28.
3718870	Feb, 1973	Keller	58/23.
3759028	Sep, 1973	Tsuruishi	58/28.

Other Refs: 1,931,507

Jan, 1970	DT

Primary Examiner: Weldon, Ulysses
Assistant Examiner:
Attorney: McGlew and Tuttle