Image pick-up apparatus and image pick-up system
AssigneeCanon Kabushiki Kaisha
InventorToshio Kameshima
Life of this patent
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Abstract
An image pick-up apparatus and an image pick-up system constructed to prevent occurrence of random noise in a photographed image due to a random noise component produced in a reference supply circuit. An image pick-up apparatus has an area sensor driven by matrix driving, and a reference supply circuit for supplying a reference voltage for driving of the area sensor, and the reference voltage is supplied through a low-pass filter (LPF) coupled to the reference supply circuit. Further, a cutoff frequency of the low-pass filter preferably is determined so that an effective value of noise of the reference voltage having passed through the low-pass filter becomes not more than one-tenth of an effective value of random noise produced in pixels of the area sensor.
Claims17
An image pick-up apparatus comprising an area sensor in which sensor elements are two-dimensionally arranged on a substrate, and a reference supply circuit, for supplying a plurality of reference voltages for driving of the area sensor, which comprises regulators for regulating each of the reference voltages, wherein the reference voltages are supplied through a low-pass filter (LPF) coupled to the reference supply circuit, and wherein a cutoff frequency of said low-pass filter is determined so that an effective value of noise of the reference voltage having passed through said low-pass filter becomes not more than one-tenth of an effective value of random noise produced in pixels of the area sensor.
Dependencies are inferred from the claim text.