Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1990-03-26
1991-08-13
Wallace, Linda J.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 4, 356 9, 356152, 36442401, 340904, 340942, G01C 310, G01C 100
Patent
active
050392174
ABSTRACT:
An apparatus for detecting the distance between one's car and the car ahead, together with the angle between the axes of the two cars. The apparatus has a pair of driving optical systems disposed at a predetermined distance from each other, each driving optical system comprising an optical system having a light projector which projects pulse light having a specific code toward the car which is ahead of the one's car and a light receiver which receives the reflected pulse light from the car ahead, the light projector and receiver being disposed in so close proximity to each other that the respective optical axes can be considered to be on substantially the same axis, and a driving system for adjusting the angle of projection of the light projector on the basis of a signal from the light receiver. The apparatus further has a central processing unit which measures the angle of projection of the pulse light from the light projector when the light receiver of each of the driving optical systems detects the reflected pulse light, thereby detecting the distance between the one's car and the car ahead, together with the angle between the axes of the two cars.
REFERENCES:
patent: 4786164 (1988-11-01), Kawata
patent: 4818887 (1989-04-01), Weishaupt et al.
patent: 4926170 (1990-05-01), Beggs et al.
Maekawa Hiroko
Ogawa Kenji
Suzuki Hiroyoshi
Mitsubishi Denki & Kabushiki Kaisha
Wallace Linda J.
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