Patent
1988-09-07
1989-09-05
Adams, Russell E.
354402, G03B 300
Patent
active
048643459
ABSTRACT:
A distance measuring and light measuring optical system which permits an automatic exposure camera to have a minimized number of windows for various optical systems and to be minimized in size and production cost. The optical system comprises an exposure setting light measuring optical system, and a mirror interposed obliquely in an optical axis of the exposure setting light measuring optical system. The mirror has a dielectric multi-layer film coated thereon for selectively reflecting light of a predetermined wavelength for measurement of a distance but transmitting light of any other wavelength therethrough. Either a light receiving means of an automatic distance measuring means is disposed on an optical axis of light of the predetermined wavelength reflected by the mirror or else a light emitting means of the automatic distance measuring means is disposed such that light emitted therefrom may be reflected by the mirror in a direction coincident to the direction of the optical axis of the exposure setting light measuring optical system.
REFERENCES:
patent: 4461557 (1984-07-01), Kimura
patent: 4488799 (1984-12-01), Suzuki et al.
patent: 4557580 (1985-12-01), Suzuki
patent: 4561748 (1985-12-01), Omaki et al.
patent: 4697905 (1987-10-01), Fujibayashi et al.
patent: 4716284 (1987-12-01), Tanaka
Adams Russell E.
Minolta Camera Kabushiki Kaisha
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