Pattern projection device for focus detection

Details Pattern projection device for focus detection Pattern projection device for focus detection

1997-05-28

1999-08-24

Perkey, W. B.

Photography

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

Having auxiliary illumination

G03B 1336, G01C 308

Patent

active

059435151

ABSTRACT:
There is disclosed a pattern projection device for a camera having a plurality of right, left, upper, and lower focus detection regions in the view field region, which device has an optical unit for splitting a pattern having a predetermined shape into a plurality of patterns in each of the vertical and horizontal directions so as to project the pattern onto the plurality of focus detection regions.

REFERENCES:
patent: 4943824 (1990-07-01), Nabeshima et al.
patent: 5274429 (1993-12-01), Misawa et al.
patent: 5485235 (1996-01-01), Meyers

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