Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2006-04-25
2006-04-25
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
Reexamination Certificate
active
07034275
ABSTRACT:
A charge generated in response to the quantity of the incident light into the photodiodes PD is accumulated in an integrating capacitor of an integrating circuit10, and a voltage V10in response to the quantity of the accumulated charge is outputted. The voltage V10is inputted into a comparison circuit20and is compared with a prescribed threshold voltage therein. When the inputted voltage reaches the threshold voltage, a saturation signal F1showing the same is outputted. A certain quantity of charge whose polarity is inverse to that of the charge accumulated in the integrating capacitor of the integrating circuit10is injected into the integrating n capacitor by the charge injecting circuit30on the basis of the saturation signal. The number of times of the voltage V10, which is outputted from the integrating circuit10, reaching the threshold voltage is counted by the counting circuit40on the basis of the saturation signal outputted from the comparison circuit20, wherein a quantity of incident light is detected on the basis of the counted made by the counting circuit40and the output voltage value from the integrating circuit10.
REFERENCES:
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patent: 6590372 (2003-07-01), Wiles, Jr.
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patent: 2001-141562 (2001-05-01), None
Drinker Biddle & Reath LLP
Hamamatsu Photonics K.K.
Luu Thanh X.
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