Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1998-07-14
2000-09-12
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
2502084, 348241, 348294, H04N 314, H04N 5335
Patent
active
061181153
ABSTRACT:
A photoelectric conversion apparatus is provided which can reduce FPNs as much as possible even if there is an unbalanced quantity between the capacitance values of a light signal capacitor CTS and a noise signal capacitor CTN, and can suppress FPNs as much as possible from being varied with irregular process precision degrees and operation conditions. The photoelectric conversion apparatus having a plurality of photoelectric conversion units, a noise signal holding unit for holding a noise signal read from each of the photoelectric conversion unit, a light signal holding unit for holding a light signal read from each of the photoelectric conversion unit a noise signal common output line, a light signal common output line, a reset unit for resetting the noise signal common output line and the light signal common output line, a reset voltage source connected to the reset unit, a read unit for reading the noise signal in the noise signal holding unit and the light signal in the light signal holding unit through a capacitance division by capacitances of the noise signal common output line and the light singal common output line, respectively, wherein the reset voltage source is provied with a variable voltage unit.
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Koide Yoshio
Kozuka Hiraku
Sugawa Shigetoshi
Allen Stephone B.
Canon Kabushiki Kaisha
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