Focus detecting device including a diffusion surface disposed on

Details Focus detecting device including a diffusion surface disposed on Focus detecting device including a diffusion surface disposed on

1992-05-15

1994-02-22

Perkey, W. B.

G03B 1336

Patent

active

052892263

ABSTRACT:
A focus detecting device comprising a photographic lens system, photoelectric converting elements for converting light intensity distribution of a light bundle having passed through the photographic lens system into electric signals, and an optical element having diffusion surface disposed on a predetermined image surface located in an optical path between the photographic lens system and the photoelectric converting elements or in the vicinity of the predetermined image surface. This focus detecting device is capable of accurately detecting focused points freely from influences due to F-numbers and locations of exit pupils of the photographic lens systems, and can be composed so as to have a compact and simple composition.

REFERENCES:
patent: 3827064 (1974-07-01), Kiyohara et al.
patent: 4155004 (1979-05-01), Schulz
patent: 4826301 (1989-05-01), Ikemori
patent: 4990947 (1991-02-01), Komiya et al.
patent: 5070353 (1991-12-01), Komiya et al.

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