Camera focus detection system using holographic beam splitter

Details Camera focus detection system using holographic beam splitter Camera focus detection system using holographic beam splitter

1991-10-07

1993-05-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

359 15, 354407, G01J 120

Patent

active

052123758

ABSTRACT:
An imaging system having a focus detecting device performs focus detection by detecting an output signal indicative of intensity distribution of light derived from a light-receiving element, in which at least one holographic optical element is arranged on the object side of a primary imaging plane to form an image on the light-receiving element. Thus, the imaging system has significant advantages in practical use that the arrangement is simple and the camera body is made compact.

REFERENCES:
patent: 4255032 (1981-03-01), Matsumoto et al.
patent: 4294529 (1981-10-01), Sato et al.
patent: 4945529 (1990-07-01), Ono et al.
patent: 4950879 (1990-08-01), Ishid et al.
patent: 5016954 (1991-05-01), Onayama et al.

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