Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-01-03
2006-01-03
Porta, David (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S221000, C340S556000
Reexamination Certificate
active
06982408
ABSTRACT:
A photo-detecting method of the present invention includes the steps of projecting from a light emitting element a pulse-modulated light as pulse-modulated at a light-emitting element drive circuit toward an object; and counting a light-receiving signal, which is converted by the light-emitting element based on either reflected light reflected from the object or transmitted light transmitted through the object, plurality of times in synchronism with a modulation frequency of the pulse-modulated light projected toward the object, so as to detect the object, wherein the modulation frequency of the pulse-modulated light projected toward the object is changed while carrying out the step of counting the light-receiving signal plurality of times. With this method, it is possible to prevent faulty operation when disturbance light or noise enters the light-receiving element without the light-receiving signal.
REFERENCES:
patent: 5099113 (1992-03-01), Oi
patent: 5243182 (1993-09-01), Murata
patent: 6429635 (2002-08-01), Okubo
patent: 04-147085 (1992-05-01), None
patent: 06-187884 (1994-07-01), None
Birch & Stewart Kolasch & Birch, LLP
Ko Tony
Sharp Kabushiki Kaisha
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