Distance measuring apparatus

Details Distance measuring apparatus Distance measuring apparatus

1996-07-19

1998-03-03

Hantis, K.

Optics: measuring and testing

By polarized light examination

With light attenuation

356 501, 340903, 250573, G01B 1114

Patent

active

057241414

ABSTRACT:
A distance measuring apparatus has: light receiving means for receiving light which is emitted from a light emitting element unit and reflected from an obstacle having a reflecting surface, a pair of members of high reflection performance being respectively disposed on portions of the reflecting surface; and a calculating circuit for calculating a distance from the obstacle on the basis of a time period between the emission and the reception of the light. According to the apparatus, in a measurement range of a short distance where light reflected from a reflecting surface positioned between the pair of members of high reflection performance is received, the maximum amount of light received by the light receiving means is set to be smaller than a sensitivity at which a snowfall is detected, and the minimum amount of light is reduced to a level at which an obstacle positioned at the short distance can be detected.

REFERENCES:
patent: 3587040 (1971-06-01), Fathauer
patent: 3604805 (1971-09-01), Scott
patent: 4699507 (1987-10-01), Etoh
patent: 4760272 (1988-07-01), Wang
patent: 4880307 (1989-11-01), Endo et al.
patent: 5283622 (1994-02-01), Ueno et al.

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