Photography – With viewfinder
Patent
1998-05-28
2000-03-14
Lee, Eddie C.
Photography
With viewfinder
396379, 396385, 396386, G03B 1302, G03B 1308
Patent
active
060384093
ABSTRACT:
In a viewfinder optical system in a thin-type camera, the following are provided: first to fourth lenses for effecting image-forming operation; a first reflecting mirror for bending a principal optical axis 90 degrees in a heightwise direction of a camera; a second reflecting mirror for bending thin bent optical axis 90 degrees in a widthwise direction of the camera; a third reflecting mirror for bending this bent optical axis 90 degrees in an opposite direction to the heightwise direction of the camera; and a fourth reflecting mirror for bending this bent optical axis 90 degrees in a direction parallel with the principal optical axis. Despite the fact that the camera is made thin, its optical path length can be made long, and it is possible to form a viewfinder optical system having a high magnification of the viewfinder or a viewfinder optical system having a zooming structure.
REFERENCES:
patent: 4032938 (1977-06-01), Karikawa et al.
patent: 4037238 (1977-07-01), Leitz et al.
patent: 5119122 (1992-06-01), Kudo et al.
patent: 5182592 (1993-01-01), Betensky et al.
patent: 5216457 (1993-06-01), Yamaguchi et al.
patent: 5235460 (1993-08-01), Abe
patent: 5621568 (1997-04-01), Hasushita et al.
patent: 5687413 (1997-11-01), Kawamura
patent: 5694628 (1997-12-01), Nishitani
patent: 5701534 (1997-12-01), Taguchi et al.
Japanese Publication entitled "Encyclopedia Of Camera" published Dec. 15, 1977, p. 70, describing a "Porro-Mirror Viewfinder System", along with an English language translation.
Asahi Kogaku Kogyo Kabushiki Kaisha
Lee Eddie C.
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