Apparatus for detecting the in-focusing conditions

Details Apparatus for detecting the in-focusing conditions Apparatus for detecting the in-focusing conditions

1979-11-09

1981-09-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250227, G02B 514

Patent

active

042899591

ABSTRACT:
An apparatus for detecting the in-focusing conditions is disclosed. The apparatus comprises a light guide member having light incident end arranged along a plane which is placed at an angle of inclination against a predetermined focal plane of an optical system; a light receiver arranged near a light outlet end of the light guide member and consisting of a plurality of charge transfer elements arranged to receive light from the outlet end as a picture element array; means for deriving illuminance signals from the picture element array of the light receiver; and means for treating the illuminance signals to detect the in-focused position of the optical system.

REFERENCES:
patent: 4060725 (1977-11-01), Hoshika

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