Infrared filter cover plate for autofocus camera

Details Infrared filter cover plate for autofocus camera Infrared filter cover plate for autofocus camera

1989-02-24

1990-05-01

Adams, Russell E.

354482, G03B 300

Patent

active

049222805

ABSTRACT:
A filter plate for an infrared range finder in a camera, which has a flat front surface and transmits infrared but absorbs visible radiation. Thereby, the range finder is protected from dirt and scratches and noise from visible radiation is reduced. It is possible to form lenses for the range finder on the back surface of the filter plate.

REFERENCES:
patent: 3813679 (1974-05-01), Hasegawa et al.
patent: 3820129 (1974-06-01), Hosoe et al.
patent: 4274735 (1981-06-01), Tamura et al.
patent: 4358186 (1982-11-01), Johnson et al.
patent: 4533241 (1985-08-01), Masunaga et al.
patent: 4549801 (1985-10-01), Winter

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