Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-12-24
1993-01-05
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250239, G01D 534
Patent
active
051773570
ABSTRACT:
An apparatus for detecting the passing state of a passing object to be detected by using a two-phase output signal has at least two light receiving elements (12a, 12b) and at least two light emitting elements (13a, 13b) which are disposed in such a manner that one light receiving element confronts one light emitting element and the other light receiving element confronts the other light emitting element, in order that even when the thickness of the object of detection is larger than the slit width thereof, light can pass through the maximum of the slit width to maximize quantities of light incident upon the light receiving elements (12a, 12b). In addition, light shielding pieces (22, 23) are provided at the front surfaces of a light receiving side transparent resin block (14) and a light emitting side transparent resin block (15) to prevent cross talk between not-confronting light receiving and emitting elements (12a, 13b) as well as between not-confronting light receiving and emitting elements (12b, 13a).
REFERENCES:
patent: 3814934 (1974-06-01), Mesh et al.
Kitanishi Shigenori
Yamaguchi Akifumi
Nelms David C.
Sharp Kabushiki Kaisha
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