Automatic multi-point distance measuring device

Optics: measuring and testing – Range or remote distance finding – With photodetection


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2502016, 354403, 359668, 359741, G01C 300, G01C 500, G03B 300




A distance measuring device has a light source for emitting a plurality of light beams in a plurality of directions, and a light receiving lens having a plurality of optical axes for receiving the plurality of light beams reflected from objects in said plurality of directions. Light receiving apparatus is provided for receiving the reflected light beams passing through said light receiving lens and providing an output corresponding to distances to the object. The light receiving lens has (1) a central portion with a thickness (D), a focal length f.sub.a, and a refractive index .phi..sub.A, and (2) a second portion adjacent said central portion. Surfaces of said central and second portions closest to said light receiving apparatus comprising one spherical surface having a refractive power .phi..sub.R. the central and second portions being disposed to satisfy the following conditions:

patent: 4371261 (1983-02-01), Tsuji
patent: 4631397 (1986-12-01), Ohsato et al.
patent: 4748469 (1988-05-01), Tamura
patent: 4843227 (1989-06-01), Matsui et al.


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