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US 5,966,550 AGranted
Automatic focusing apparatus in a camera
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorsMasahiro Oono, Hisao Iwanade, Noboru Saitoh, Koji Sato, Sukenori Shiba, Tatsuya Yoshida, Nobuyuki Nagai
Life of this patent
Estimating the term…
Abstract
An automatic focusing apparatus of a camera includes a photographing lens having a focusing lens group and a focus control mechanism which moves the focusing lens group to a hyper-focal distance position when no effective object distance is obtained.
Claims15
An automatic focusing apparatus of a camera comprising:
- a photographing lens having a focusing lens group;
- a diaphragm having an aperture formed therein for restricting an amount of light passing through said photographing lens;
- an autofocus system for obtaining an object distance to an object to be photographed through said photographing lens;
- a photometering system that receives light from an object to be photographed and calculates an appropriate exposure setting including an appropriate diaphragm value corresponding to an aperture size;
- a hyper-focal distance control system that, when said autofocus system fails to obtain said object distance, sets a corrected diaphragm value having an aperture size smaller than that of said appropriate diaphragm value by a predetermined step value, and sets a hyper-focal distance position of said photographing lens based on said corrected diaphragm value;
- and
- a focus controller for moving said focusing lens group to said hyper-focal distance position when said autofocus system fails to obtain said object distance.
4 more elements
An automatic focusing apparatus of a camera comprising:
- a photographing lens having a focusing lens group;
- an autofocus system for obtaining an object distance to an object to be photographed through said photographing lens;
- a diaphragm having an aperture formed therein for restricting an amount of light passing through said photographing lens;
- a photometering system that receives light from an object to be photographed and calculates an appropriate exposure setting including an appropriate diaphragm value corresponding to an aperture size;
- a hyper-focal distance control system that sets a corrected diaphragm value having an aperture size smaller than said appropriate diaphragm value by a predetermined step value, and sets a hyper-focal distance position of said photographing lens based on said corrected diaphragm value;
- and
- a focus controller for moving said focusing lens group to said hyper-focal distance position.
4 more elements
Dependencies are inferred from the claim text.