Motor driver for auto-focus camera

Details Motor driver for auto-focus camera Motor driver for auto-focus camera

1985-01-18

1986-09-23

Adams, Russell E.

35419512, 354286, G03B 300

Patent

active

046132244

ABSTRACT:
A motor driver circuit for auto-focus camera comprising a voltage supply circuit, a duty ratio changing circuit for changing the duty ratio of pulse signal according to the voltage level of said voltage supply circuit and a control circuit for controlling the supply of driving current to the motor by virtue of the output signal from said duty ratio changing circuit.

REFERENCES:
patent: Re31219 (1983-04-01), Shenk
patent: 4284335 (1981-08-01), Takamae et al.
patent: 4319171 (1982-03-01), Motoori
patent: 4336987 (1982-06-01), Shenk
patent: 4348089 (1982-09-01), Shenk
patent: 4360258 (1982-11-01), Hashimoto
patent: 4422739 (1983-12-01), Watanabe et al.
patent: 4473286 (1984-09-01), Watanabe et al.
patent: 4496229 (1985-01-01), Ogasawara

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