Title: Circuit for eliminating current noises from d.c. motor

Abstract: A circuit for eliminating a.c. noise current which is produced as a result of the interruption of electrical contact between a brush and a commutator of a d.c. motor and comprises a capacitor which applies the noise current to a transistor, which in turn inverts the waveform of the current and applies it in an inverted phase to a power source for the motor, thereby cancelling the a.c. noise.

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Inventors: Satoh, Ken (Tokyo, JA)

Application Number: 580777
Filing Date: 1975-05-27
Publication_date: 1977-09-13
Assignee: Olympus Optical Company, Ltd. (Tokyo, JA)
Primary Class(es): 388/832 307/90, 318/460
Other Classes:
US Patent Ref:

1490031	Apr, 1924	Schmidt	307/90.
3214668	Oct, 1965	Brinster	318/345.
3336517	Aug, 1967	Cain	318/345.
3564370	Feb, 1971	Catherin	318/629.
3737748	Jun, 1973	Teders	318/345.

Other Refs:
Primary Examiner: Dobeck, B.
Assistant Examiner:
Attorney: Ostrolenk, Faber, Gerb & Soffen