Focus detecting device having at least three reimaging lenses

Details Focus detecting device having at least three reimaging lenses Focus detecting device having at least three reimaging lenses

1993-10-25

1995-06-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354408, G01J 120

Patent

active

054245281

ABSTRACT:
A focus detecting device includes a condenser lens, an aperture stop with a plurality of openings, a plurality of reimaging lenses, and light receiving element arrays. Focus detection is performed by detecting the phase difference between two output signals derived from the light receiving element arrays. The vertices of the reimaging lenses are situated on a line connecting the centers of the openings, and light beams are conducted through the reimaging lenses corresponding thereto to the light receiving element arrays. Thus, the focus detecting device is capable of extending the focus detecting area and improving the focusing accuracy.

REFERENCES:
patent: 4959677 (1990-09-01), Suda et al.
patent: 5245175 (1993-09-01), Inabata
patent: 5257062 (1993-10-01), Moriyama
patent: 5321248 (1994-06-01), Sensui

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