Focus detecting device

Details Focus detecting device Focus detecting device

1984-10-17

1986-06-03

Perkey, William B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, G03B 300

Patent

active

045926379

ABSTRACT:
This specification discloses a focus detecting device for detecting the focus state of an objective lens by sensing the light from a light source reflected by an object by means of a sensor provided near a plane conjugate with respect to the predetermined imaging plane of the objective lens, wherein the sensor is inclined with respect to the conjugate plane to thereby increase the energy of the light received by the sensor during non-in-focus.

REFERENCES:
patent: 4277156 (1981-07-01), Fukushima et al.
patent: 4303319 (1981-12-01), Hell et al.
patent: 4304487 (1981-12-01), Odone et al.
patent: 4313654 (1982-02-01), Matsui
patent: 4458145 (1984-07-01), Voles
patent: 4494868 (1985-01-01), Lambeth

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