Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-08-09
1990-11-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502016, 356 1, G01J 120, G01V 904, G01C 300
Patent
active
049703846
ABSTRACT:
An optical sensor discriminating the presence of an object or detecting distance to an object which includes a light projecting element for projecting light to a detection area, a light receiving element for receiving light reflected from an object present in the detection area and an anamorphic light receiving lens for expanding a condensed light spot received on the light receiving element in a direction perpendicular to a direction of movement of the light spot on the light receiving element. The light receiving element outputs a detection signal which discriminates the presence of the object in the detection area. The light receiving element can be rectangular in shape and comprise two or more triangular shaped photodiodes which output detection signals that can be processed to determine a distance between the object and the light receiving element. A movable prism can also be provided to compensate for movement of the object other than towards or away from the light receiving element to avoid erroneous distance measurement which might otherwise occur.
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Hirono Atsuyuki
Ito Takayasu
Kambe Yoshiaki
Nagaoka Akira
Okuda Yoshihiko
Matsushita Electric & Works Ltd.
Messinger Michael
Nelms David C.
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