Focus detecting device

Details Focus detecting device Focus detecting device

1984-12-03

1988-01-05

Wan, Gene

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356 4, G01J 136, G01C 308

Patent

active

047178191

ABSTRACT:
A focus detecting device arranged to detect the focusing condition of an objective lens by projecting a light flux from a light source onto an object through the objective lens and by sensing the light flux after it is reflected from the object. The focus detecting device is provided with sensors which produce information necessary for detecting the focal point of the objective lens by sensing the light of the light source reflected by the object. Degradation of the device's detection accuracy due to the eccentrically mounted objective lens is prevented when these sensors are symmetrically arranged relative to a plane containing the optical axis of the objective lens.

REFERENCES:
patent: 4563576 (1986-01-01), Matsumura et al.

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