Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1989-12-22
1992-04-21
Evans, F. L.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250548, 250561, 250237G, G01B 1100, G01N 2147
Patent
active
051071304
ABSTRACT:
A sensor assembly is provided in which a balanced pair of sensors is provided by abutting two optical devices each having a light emitting diode of infrared emitting diode type (IRED) and a photosensitive transistor. By using only one IRED which is located between the photo-sensitive transistors, a substantially identical image of an object placed above the IRED is provided to simultaneously to each of the phototransistors. The sensors mounted on a printed circuit board are also aligned to windows on a surface of the sensor assembly automatically by providing projections, preferably cylindrical, on the inside walls of the sensory assembly and complementary recesses on the printed circuit board. Signals are transmitted to a multiplicity of printed circuit boards simultaneously by threading conductors through holes situated at predefined locations on each printed circuit board.
REFERENCES:
patent: 3557380 (1971-01-01), Matthews
patent: 3894216 (1975-07-01), Bottles
patent: 4731542 (1988-05-01), Doggett
patent: 4808832 (1989-02-01), Doggett
patent: 4843237 (1989-06-01), Michel
Evans F. L.
Synergy Computer Graphics Corporation
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