Focusing detecting device with coaxial source and detector

Details Focusing detecting device with coaxial source and detector Focusing detecting device with coaxial source and detector

1982-11-16

1985-08-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01J 120

Patent

active

045380627

ABSTRACT:
The focusing detecting device determines whether or not the optical image of an object to be photographed is in a focusing state in which the image is clearly formed on a predetermined image forming surface through a photographing or image forming optical system. The device can be used with a dark optical system.

REFERENCES:
patent: 3918071 (1975-11-01), Albrecht
patent: 3969575 (1976-07-01), Gerritsen et al.
patent: 4152586 (1979-05-01), Elliott et al.
patent: 4357533 (1982-11-01), Winslow

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