Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2011-06-21
2011-06-21
Le, Que T (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S205000
Reexamination Certificate
active
07964838
ABSTRACT:
The present invention discloses a photosensitive circuit comprising a photosensitivity unit, a capacitance and a switch unit. The photosensitivity unit is capable of receiving a received light, and the capacitance is capable of storing a photoelectric current corresponding to the received light. The switch unit is used to respectively provide the positive voltage of the capacitance to a comparison unit at a first time period, and the negative voltage of the capacitance to a comparison unit at a second time period. The comparison unit outputs a detection value according to the positive voltage and the negative voltage of the capacitance, the detection value is related to the distance between an object and the photosensitive circuit. The present invention further disclose a photosensitive chip to drive a luminescent unit to provide a detective light. The photosensitive chip comprises a sampling clock generator, the ambient light sensor unit, a proximity sensor unit and a driving clock generator.
REFERENCES:
patent: RE31446 (1983-11-01), Kawasaki
patent: 4870267 (1989-09-01), Beeckel
Huang Cheng Chieh
Kuo Jinn-Ann
Bacon & Thomas PLLC
Capella Microsystems (Taiwan), Ltd.
Le Que T
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