CAMERA WITH AUTOFOCUS SYSTEM
First Claim
1. A camera comprising:
- a contrast detector that successively detects contrast data of an object image that is formed on a light-receiving surface of an image sensor;
a focus detector that detects a focused situation on the basis of the contrast data; and
a focus adjuster that focuses the object by driving a photographing optical system, said focus adjuster driving said photographing optical system so as to shift the image-formed surface forward and backward to the light-receiving surface when the object is out of focus, said focus detector detecting standard contrast data corresponding to a position before shifting the image-formed surface, forward contrast data corresponding to a forward position, and backward contrast data corresponding to a backward position, said focus adjuster shifting the image-formed surface toward a direction of increase of the contrast data that is obtained from the standard contrast data, the forward contrast data, and the backward contrast data.
1 Assignment
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Accused Products
Abstract
A camera has a contrast detector that successively detects contrast data of an object image that is formed on a light-receiving surface of an image sensor, and a focus detector that detects a focused situation on the basis of the contrast data. The camera has, further, a focus adjuster that focuses the object by driving a photographing optical system. When the object is out of focus, the focus adjuster drives the photographing optical system so as to shift the image-formed surface forward and backward. Then, the focus detector detects standard contrast data corresponding to a position before shifting the image-formed surface, forward contrast data corresponding to the forward position, and backward contrast data corresponding to the backward position. The focus adjuster shifts the image-formed surface toward a direction of increase of the contrast data that is obtained from the standard contrast data, the forward contrast data, and the backward contrast data.
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Citations
8 Claims
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1. A camera comprising:
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a contrast detector that successively detects contrast data of an object image that is formed on a light-receiving surface of an image sensor;
a focus detector that detects a focused situation on the basis of the contrast data; and
a focus adjuster that focuses the object by driving a photographing optical system, said focus adjuster driving said photographing optical system so as to shift the image-formed surface forward and backward to the light-receiving surface when the object is out of focus, said focus detector detecting standard contrast data corresponding to a position before shifting the image-formed surface, forward contrast data corresponding to a forward position, and backward contrast data corresponding to a backward position, said focus adjuster shifting the image-formed surface toward a direction of increase of the contrast data that is obtained from the standard contrast data, the forward contrast data, and the backward contrast data. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for focusing an object comprising:
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a focus detector that detects a focused situation on the basis of successively detected contrast data; and
a focus adjuster that focuses the object by driving a photographing optical system, said focus adjuster driving said photographing optical system so as to shift the image-formed surface forward and backward to the light-receiving surface when the object is out of focus, said focus detector detecting standard contrast data corresponding to a position before shifting the image-formed surface, forward contrast data corresponding to a forward position, and backward contrast data corresponding to a backward position, said focus adjuster shifting the image-formed surface toward a direction of increase of the contrast data that is obtained from the standard contrast data, the forward contrast data, and the backward contrast data.
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7. A computer program product comprising:
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a focus detector that detects a focused situation on the basis of successively detected contrast data; and
a focus adjuster that focuses the object by driving a photographing optical system, said focus adjuster driving said photographing optical system so as to shift the image-formed surface forward and backward to the light-receiving surface when the object is out of focus, said focus detector detecting standard contrast data corresponding to a position before shifting the image-formed surface, forward contrast data corresponding to a forward position, and backward contrast data corresponding to a backward position, said focus adjuster shifting the image-formed surface toward a direction of increase of the contrast data that is obtained from the standard contrast data, the forward contrast data, and the backward contrast data.
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8. A method for focusing an object comprising:
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detecting a focused situation on the basis of successively detected contrast data;
driving said photographing optical system so as to shift the image-formed surface forward and backward to the light-receiving surface when the object is out of focus;
detecting standard contrast data corresponding to a position before shifting the image-formed surface, forward contrast data corresponding to a forward position, and backward contrast data corresponding to a backward position; and
shifting the image-formed surface toward a direction of increase of the contrast data that is obtained from the standard contrast data, the forward contrast data, and the backward contrast data.
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Specification