Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2007-08-14
2007-08-14
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S238000, C250S2140LS, C348S302000, C348S229100
Reexamination Certificate
active
10452390
ABSTRACT:
An output compensating device capable of optimally compensating output signals of an image sensor composed of a number of light-sensor circuits, each of which represents a unit pixel and is capable of producing in a photoelectric converting element a sensor current proportional to a quantity of light falling thereon, converting the current into a voltage signal by a MOS type transistor with a logarithmic output characteristic in a weak inverse state, initializing itself by removing a charge accumulated in a parasitic capacitor of the photoelectric converting element by changing a drain voltage of the transistor to a value lower than a normal value for a specified time and outputting a pixel signal having a logarithmic characteristic at a large quantity of the sensor current and a pixel signal having a non-logarithmic characteristic at a small quantity of the sensor current. This device has a means for compensating each pixel signal from the image sensor for an offset value and outputting a resulting signal if said signal has an output characteristic within a logarithmic response region or a non-logarithmic region depending on the output condition and, if not, further compensating the offset-compensated signal for its gain and outputting a resulting signal, thus ensuring the optimal compensation of each pixel signal of the image sensor in accordance with its output state.
REFERENCES:
patent: 6191408 (2001-02-01), Shinotsuka et al.
patent: 6828539 (2004-12-01), Kuwabara
patent: 2000-175108 (2000-06-01), None
patent: 2000-329616 (2000-11-01), None
Furukawa Makoto
Kurita Jiro
Shinotsuka Sukeyuki
Takebe Katsuhiko
Allen Stephone B.
Fulbright & Jaworski L.L.P.
Honda Giken Kogyo Kabushiki Kaisha
Lee Patrick J.
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