Automatic camera focusing apparatus with movable position sensit

Details Automatic camera focusing apparatus with movable position sensit Automatic camera focusing apparatus with movable position sensit

1987-08-31

1989-05-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356 1, G01J 120

Patent

active

048291714

ABSTRACT:
An apparatus for automatically focusing a movable lens with respect to an object comprising means for projecting light on to the object, a movable light detector for receiving at an incident position light reflected from the object, a position generating circuit for generating a position signal indicating the position in the light detector of the incident position, a linking mechanism adapted to interlink the light detector and the lens to move the light detector such that when the lens is in focus with respect to the object the light reflected form the object is received at a predetermined position of the light detector and a positioning mechanism responsive to the position signal and adapted to move the lens to a position in focus with the object, the linking mechanism being responsive to the movement of the lens to the focus position to move the light detector to a position wherein the reflected light is received at the predetermined position of the light detector means.

REFERENCES:
patent: 4527892 (1985-07-01), Yamane et al.
patent: 4561746 (1985-12-01), Matsuda et al.
patent: 4566773 (1986-01-01), Kaneda
patent: 4623237 (1986-11-01), Kaneda et al.
patent: 4673274 (1987-06-01), Nagaoka et al.

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