Focus detection device

Details Focus detection device Focus detection device

1997-01-08

1999-02-23

Adams, Russell E.

Photography

With exposure objective focusing means, focusing aid, or...

Having auxiliary illumination

396109, 396114, G03B 1300, G03B 1502

Patent

active

058753605

ABSTRACT:
A focus detection device that is capable of performing focus detection in several focus detection areas within a photographic image plane using, for example, a phase difference method and that uses an auxiliary illumination light with at least one of the areas also includes infrared light cut filters that block the transmission of light above predetermined wavelengths. In particular, the maximum wavelength of the light transmitted by the infrared cut filter for one of the focus detection areas is different than the maximum wavelength of the light transmitted by the infrared cut filter for another one of the focus detection areas.

REFERENCES:
patent: 4901102 (1990-02-01), Karasaki et al.
patent: 4935613 (1990-06-01), Ishiguro et al.

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