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 is preferably 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.
Claims1
An image pick-up apparatus comprising:
- an area sensor in which detecting elements are two-dimensionally arranged on a substrate;
- a reference supply circuit, for supplying a reference voltage to the detecting elements, which comprises a regulator for regulating the reference voltage;
- and
- a low-pass filter arranged between the regulator and the detecting elements, wherein the reference voltage is supplied through the low-pass filter from the reference supply circuit,
- 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 the area sensor.
Dependencies are inferred from the claim text.