Light-projecting system for automatic focus detection

Details Light-projecting system for automatic focus detection Light-projecting system for automatic focus detection

1995-09-12

1998-12-15

Adams, Russell E.

Photography

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

Having auxiliary illumination

396106, G03B 1300, G03B 1503

Patent

active

058505784

ABSTRACT:
A light-projecting system for illuminating a central portion of a screen and a pair of peripheral portions on either side of the central portion in order to perform focus detection for each of the central portion and the pair of peripheral portions, comprises a first pattern for forming first illumination light for illuminating the central portion of the screen, and a second pattern common to the pair of peripheral portions, for forming second illumination light and third illumination light, different in light intensity distribution from the first illumination light, for illuminating the pair of peripheral portions separately, thereby providing the light-projecting system for automatic focus detection, permitting high-accuracy focus detection by expanding the illumination range.

REFERENCES:
patent: 4801963 (1989-01-01), Koyama et al.
patent: 4958180 (1990-09-01), Matsui et al.
patent: 4963911 (1990-10-01), Matsui et al.
patent: 5150146 (1992-09-01), Ueda et al.
patent: 5305047 (1994-04-01), Hayakawa et al.

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