Real-image type viewfinder

Details Real-image type viewfinder Real-image type viewfinder

1998-03-04

2000-07-11

Adams, Russell

Photography

With viewfinder

396296, G03B 1302

Patent

active

060885459

ABSTRACT:
A viewfinder optical system for a real-image type viewfinder has a positive objective lens system for obtaining a finder-image, and an erecting optical system for converting the finder-image into an erected image. The erecting system includes a mirror for deflecting an optical axis of the objective lenses, and at least a part of the mirror is formed as a light-transmitting area. The viewfinder optical system further comprises an ocular lens for viewing the finder-image, and an optical system for optically producing an information pattern, such as a viewing-field-frame, to be superimposed on the finder-image. The projecting system includes a projecting lens which focuses and forms the frame-pattern on an image-forming plane, defined by the objective lens system, through the light-transmitting area of the mirror, so that the frame-pattern is superimposed on the finder-image.

REFERENCES:
patent: 4016576 (1977-04-01), Nomura
patent: 4231649 (1980-11-01), Kimura et al.
patent: 4560264 (1985-12-01), Kitazawa et al.
patent: 5218396 (1993-06-01), Morisawa
patent: 5223874 (1993-06-01), Kirigaya
patent: 5488446 (1996-01-01), Kirigaya et al.
patent: 5581318 (1996-12-01), Shirator
patent: 5604554 (1997-02-01), Kirigaya

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