Optical apparatus

Details Optical apparatus Optical apparatus

2005-05-27

2009-06-16

Perkey, W. B. (Department: 2862)

Photography

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

Having indicator

Reexamination Certificate

active

07548688

ABSTRACT:
An optical apparatus having a viewfinder optical system includes a Fresnel lens capable of converging light onto a focusing screen and a plurality of microprism groups disposed in positions corresponding to focusing areas. Beams of light are projected onto each microprism group.

REFERENCES:
patent: 5579079 (1996-11-01), Yamada
patent: 5802408 (1998-09-01), Suda
patent: 6920284 (2005-07-01), Haraguchi et al.
patent: 2005/0002663 (2005-01-01), Haraguchi
patent: 2005/0238344 (2005-10-01), Matsuda
patent: 1-277225 (1989-11-01), None
patent: 4-278931 (1992-10-01), None
patent: 5-333259 (1993-12-01), None
patent: 10-048733 (1998-02-01), None
patent: 2004-085808 (2004-03-01), None

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