Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1986-11-10
1989-05-09
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
354167, 354403, 354404, 250216, G01C 310, G03B 300, G03B 1320
Patent
active
048283835
ABSTRACT:
A range-finding optical system comprising a light emitting element, a light projecting lens located in front of the light emitting element and serving to project the light emitted from the light emitting element onto an object, a light receiving element, a light receiving lens located in front of the light receiving element and serving to converge the light, which is emitted from the light emitting element and reflected by the object, onto the light receiving element, a member for interconnecting the light projecting lens and light receiving lens and for defining the distance therebetween, and a member for interconnecting the light emitting element and light receiving element and for defining the distance therebetween, the range-finding optical system being arranged that the displacement of the focus point of the photographic lens system to be caused by temperature variation is easily compensated by means of the difference between the coefficient of thermal linear expansion of the member for interconnecting the light projecting lens and light receiving lens and the coefficient of thermal linear expansion of the member for interconnecting the light emitting element and light receiving element without additionally adopting a particular member.
REFERENCES:
patent: 4313654 (1982-02-01), Matsui et al.
patent: 4419574 (1983-12-01), Kawabata et al.
patent: 4650309 (1987-03-01), Ishida et al.
patent: 4688919 (1987-08-01), Ogawa et al.
Kunishige Keiji
Tsuchida Hirofumi
Buczinski Stephen C.
Olympus Optical Co,. Ltd.
Wallace Linda J.
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