Camera with automatic focusing apparatus

Details Camera with automatic focusing apparatus Camera with automatic focusing apparatus

1988-03-01

1989-04-18

Adams, Russell E.

354402, 3541951, G03B 300

Patent

active

048231576

ABSTRACT:
An automatic focusing apparatus for a camera wherein a distance measurement signal is stored as a digital value, pulses corresponding to a distance, which are generated upon rotational movement of a lens along an optical axis through a motor, are counted, and a stop pawl for stopping the lens is driven in accordance with the count value. A pulse width of the pulses of the pulse signal is detected, the pulses of the pulse signal are counted, and when the number of the counted pulses corresponds to the stored digital value, the stop pawl is driven after a delay time which is determined based on the detected pulse width of a pulse of the pulse signal.

REFERENCES:
patent: 4623233 (1986-11-01), Yamada et al.
patent: 4724455 (1988-02-01), Suzuki et al.
patent: 4733261 (1988-03-01), Gunshi et al.
patent: 4748466 (1988-05-01), Yamada et al.

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