Object sensing apparatus having filter member

Details Object sensing apparatus having filter member Object sensing apparatus having filter member

1998-07-15

2000-08-08

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

356 304, 356 401, G01B 1114, G01C 308

Patent

active

061009830

ABSTRACT:
An object sensing apparatus comprises a distance measuring device for measuring a distance to an object to be sensed, and a filter member having a surface disposed in confronting and spaced-apart relation to the distance measuring device. The distance measuring device has a light projecting element for projecting light toward the object and a light receiving element for receiving the light projected by the light projecting element and reflected by the object. The filter member is disposed at a preselected angle of inclination with respect to the distance measuring device. When the light projecting element projects light toward the object, light reflected or scattered by the surface of the filter member is directed in a direction away from the light receiving element.

REFERENCES:
patent: 3214596 (1965-10-01), Schwerdt, Jr. et al.
patent: 5220453 (1993-06-01), McKinley e t al.
patent: 5455669 (1995-10-01), Wetteborn
patent: 5602376 (1997-02-01), Coleman et al.
Patent Abstracts of Japan, vol. 11, No. 126 (P-569), Apr. 21, 1987, and Japanese Patent No. 61-269087, Nov. 28, 1986.

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