Photography – With viewfinder – With prism
Patent
1998-03-04
2000-05-02
Adams, Russell
Photography
With viewfinder
With prism
396271, 396296, 396373, G03B 1302
Patent
active
060582731
ABSTRACT:
A real-image type viewfinder comprises a viewfinder optical system including a positive objective lens system for obtaining an inverted finder-image, an erecting optical system for converting the inverted finder-image into an erected finder-image, and an ocular lens system for viewing the erected finder-image through the erecting optical system. A half mirror is provided at a suitable location along a viewfinder optical axis, defined by the viewfinder optical system. A photometry optical system is provided along an extension of an incident optical axis, defined by a principal ray of light rays being incident on the half mirror along an optical axis of the objective lens system. An optical information-pattern-forming system is provided along an extension of a reflective optical axis, defined by a principal ray of light rays reflected by the half mirror toward the ocular lens system.
REFERENCES:
patent: 4016576 (1977-04-01), Nomura
patent: 4231649 (1980-11-01), Kimura et al.
patent: 5218396 (1993-06-01), Morisawa
patent: 5223874 (1993-06-01), Kirigaya
patent: 5581318 (1996-12-01), Shiratori
patent: 5604554 (1997-02-01), Kirigaya
Adams Russell
Asahi Kogaku Kogyo Kabushiki Kaisha
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