Motor drive circuit for camera

Details Motor drive circuit for camera Motor drive circuit for camera

1982-04-28

1983-11-15

Perkey, William B.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307297, 323281, 318139, 318302, G03B 118, G05F 158, H02P 700

Patent

active

044152493

ABSTRACT:
A motor drive circuit for a camera which circuit is adapted to control a motor which is incorporated in a camera body, a film winder, a lens cylinder body or the like. The function of such a motor is to carry out film winding and rewinding, shutter charging and actuation of a taking lens for focusing or other photographic operations. The motor drive circuit is provided with a battery for supplying electric power to the motor and is arranged to control a motor driving current which is supplied to the motor and a control current which is not supplied to the motor but is used to control the motor driving current, so as to raise the efficiency of the use of the battery, i.e., to bring about longevity of the battery.

REFERENCES:
patent: 3828240 (1974-08-01), Keller et al.
patent: 3909835 (1975-09-01), Ito et al.
patent: 4085359 (1978-04-01), Ahmed
patent: 4319179 (1982-03-01), Jett, Jr.

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