TV Camera with focus detecting means
AssigneeCanon Kabushiki Kaisha
InventorsToshio Sakane, Kazuya Hosoe, Takao Kinoshita, Tokuichi Tsunekawa, Takashi Kawabata
Life of this patent
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Abstract
In the disclosed TV camera, a focus detecting device detects the focus of the image optical system by evaluating the image of the object whose image is to be picked up, on the basis of the picture image signal obtained at a predetermined position in the image pick up surface of the image pick up device. At least a part of the image to be evaluated is formed at a position within the scanning area of the image pick up device but outside of the effective image pick up area for TV signals. The image is evaluated on the basis of the picture image signal obtained at this position to detect the focus.
Claims10
A television camera comprising:
- (A) an image pick-up device including an image pick-up surface with a main pick-up area and a subsidiary pick-up area;
- (B) an image forming optical system for forming an image of an object to be picked up on the main image pick-up area in the image pick-up surface of the image pick-up device;
- (C) a detecting optical system for forming at least one detection image of the object for focus detection on the subsidiary image pick-up area in the image pick-up surface of the image pick-up device but outside of the main image pick-up area;
- and
- (D) a circuit system for producing a signal related to focus of the image forming optical system on the basis of the image signal obtained from the subsidiary image pick-up area of the image pick-up device.
Dependencies are inferred from the claim text.