Patent
1993-01-12
1994-08-23
Adams, Russell E.
354165, G03B 1336
Patent
active
053411862
ABSTRACT:
The invention concerns an active autofocusing type rangefinder optical system that prevents a finder system and a light projection system from producing parallax and is capable of finding the distance of an object with high accuracy, in which an optical path-splitting means Bs is located somewhere in the optical path of the objective optical system thereof that is provided separately from a taking or photographic optical system, one of the optical path split by said splitting means being assigned to said finder optical system and the other to a range finding optical system, wherein a portion of the optical system located on the object side from said optical path-splitting means has a positive refracting power as a whole, a portion of the optical system extending from said optical path-splitting means to the intermediate image-forming surface of the finder optical system has a positive or negative refracting power as a whole, and a portion of the optical system located on the side of said range finding element from said optical path-splitting means.
REFERENCES:
patent: 2360822 (1944-10-01), Altman
patent: 4072969 (1978-02-01), Cheavin
patent: 4360256 (1982-11-01), Grassl
patent: 4534637 (1985-08-01), Suzuki et al.
patent: 4575211 (1986-03-01), Matsumura et al.
patent: 5270758 (1993-12-01), Morooka
Adams Russell E.
Olympus Optical Co,. Ltd.
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