Automatic focusing control system

Details Automatic focusing control system Automatic focusing control system

1986-11-07

1988-10-11

Perkey, W. B.

3541951, G03B 300

Patent

active

047775050

ABSTRACT:
An automatic focusing control system includes a focus detecting light detector, a rangefinder, a lens driver, a manual range setting unit, a mode setting unit, and a control unit. When a manual mode is selected by the mode setting unit, the control unit applies a lens driving signal from the manual range setting unit to the lens driver unit to drive a lens. When an automatic mode is selected by the mode setting unit, the control unit operates the lens driver unit to drive the lens based on a measured distance at the time distance measurement is possible, applies the lens driving signal from the manual range setting unit to the lens driver unit at the time distance measurement is impossible, and operates the lens driver unit to drive the lens based on the measured distance at the time distance measurement becomes possible from a condition in which distance measurement is impossible.

REFERENCES:
patent: 4156563 (1979-05-01), Kato et al.
patent: 4247187 (1981-01-01), Tamura
patent: 4523827 (1985-06-01), Masunaga et al.
patent: 4538892 (1985-09-01), Sakai et al.
patent: 4572643 (1986-02-01), Akashi
patent: 4573784 (1986-03-01), Suzukji

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