Light emitter and optical system for a distance measuring device

Details Light emitter and optical system for a distance measuring device Light emitter and optical system for a distance measuring device

1990-10-10

1992-04-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502016, 356 1, 354403, G01N 2186

Patent

active

051091615

ABSTRACT:
In an optical system arranged to detect a distance to an object to be photographed by projecting beams of light from a light emitting element which emits visible light or infrared rays or the like and by receiving reflected light from the object at a light receiving element, a light projecting lens system having a plurality of optical axes is arranged in front of the light emitting element to have a spherical or aspherical surface on the side of the object and a plurality of planes for forming the plurality of optical axes on the side of the light emitting element.

REFERENCES:
patent: 3434785 (1969-03-01), Weber
patent: 4371261 (1983-02-01), Tsuji
patent: 4575211 (1986-03-01), Matsumura et al.
patent: 4748469 (1988-05-01), Tamura
patent: 4897536 (1990-01-01), Miyoshi
patent: 5004902 (1991-04-01), Matsui et al.

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