Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-06-25
1989-04-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, G01D 534
Patent
active
048209180
ABSTRACT:
An optical encoder comprising: an optical scale having a light-transmitting portion and a non-transmitting portion the non-transmitting portion being composed of a slanted face an incident angle of incoming light to which is set larger than the critical angle, the both portions being alternately formed on a protruding mark area formed on a part of a translucent member; light projecting device for illuminating the optical scale; and photoelectric converting device for converting the light, modulated by the optical scale, into electrical signal.
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Igaki Masahiko
Maekawa Tomohiro
Rachi Masahiro
Canon Kabushiki Kaisha
Nelms David C.
Oen William L.
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