In-focus state detection device

Details In-focus state detection device In-focus state detection device

1984-10-29

1986-06-17

Perkey, William B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, G03B 300, G01J 120

Patent

active

045952710

ABSTRACT:
An in-focus state detection device having a light source for emitting a near-infrared light for detecting an in-focus state of an object lens by sensing the light of the light source reflected by an object by a sensor through the object lens is disclosed. The in-focus state of the object lens to a visible light is exactly detected by correcting a relation between the light of the light source transmitted through the object lens and the sensor in accordance with a change in chromatic aberration information of the object lens to the light of the light source.

REFERENCES:
patent: 4357085 (1982-11-01), Niwa et al.
patent: 4473287 (1984-09-01), Fukuhara et al.
patent: 4483602 (1984-11-01), Aoki et al.
patent: 4504135 (1985-03-01), Kawabata

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