# US 5,351,105 A · Auto focus camera > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,351,105 A - Document ID: US5351105A - Status: Granted - Kind: A - Application number: 08/065,454 - Filed: 1993-05-21 - Granted: 1994-09-27 - Earliest claimed: 1989-07-05 - Assignees: Asahi Kogaku Kogyo Kabushiki Kaisha - Inventors: Isamu Hirai - Web page: https://patentgrep.com/patent/US5351105A ## CPC - G02B 7/28: Systems for automatic generation of focusing signals - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An autofocus camera having a plurality of object distance measuring zones and a photographing lens system. A distribution pattern of objects is deflected in the object distance measuring zones in accordance with object distances of the objects. An axial position of at least a part of the photographing lens system is adjusted in the optical axis direction to detect the position of the focal plane so that the focal plane can be varied. The adjusting of the axial position of at least a part of the lens system and the varying of the focal plane are driven in accordance with the distribution pattern of the objects so that the focal point of the photographing lens meets the objects. ## Claims ### Claim 1 An autofocus camera comprising a plurality of object distance measuring zones, and a detector that detects a distribution pattern of objects in said plurality of object distance measuring zones, said detector further comprising means for detecting said distribution pattern of objects in said plurality of object distance measuring zones and means for simultaneously setting a focus on objects in at least two of said plurality of object distance measuring zones, by adjusting a field of curvature to bring said plurality of object distance measuring zones into focus. ### Claim 2 (depends on 1) An auto focus camera according to claim 1, wherein said plurality of object distance measuring zones have at least three zones consisting of a center zone, and right and left zones or upper or lower zones located on the opposite sides of the center zone. ### Claim 3 (depends on 2) An auto focus camera according to claim 2, wherein the distribution pattern of the objects is detected in accordance with the object distances of the objects in the right and left zones or in the upper and lower, in comparison with a reference object distance which is the object distance of the object in the center zone. ### Claim 4 (depends on 1) An auto focus camera according to claim 1, wherein said plurality of object distance measuring zones have at least three zones consisting of a center zone, and upper and lower zones located on opposite sides of said center zone. ### Claim 5 (depends on 4) An auto focus camera according to claim 4, wherein said distribution pattern of said objects is detected in accordance with object distances of said objects in said upper and lower zones in comparison with a reference object distance which is said object distance of said object in said center zone. ### Claim 6 An autofocus camera comprising a plurality of object distance measuring zones, and a detector that detects a distribution pattern of objects in said plurality of object distance measuring zones, wherein said distribution pattern of objects in said plurality of object distance measuring zones is detected by said detector and is used for simultaneously setting a focus on objects in at least two of said plurality of object distance measuring zones, by adjusting a focal plane of said camera to bring said plurality of object distance measuring zones into focus, wherein said adjusting of said focal plane comprises means for adjusting an angle of an optical axis of a lens associated with said camera with respect to a film plane associated with said camera. ### Claim 7 A camera, comprising: a plurality of object distance measuring zones; means for varying an orientation of a field curvature; and means for detecting a distribution pattern of objects in said plurality of object distance measuring zones, said detecting means controlling said field curvature varying means to set an in-focus condition with respect to objects in at least two of said plurality of object distance measuring zones. ### Claim 8 (depends on 7) The camera of claim 7, wherein said plurality of object distance measuring zones comprise at least three object distance measuring zones. ### Claim 9 (depends on 7) The camera of claim 7, wherein said field curvature varying means comprises means for adjusting a relationship between an optical axis of a lens associated with said camera and a film plane associated with said camera. ### Claim 10 A camera, comprising: a plurality of object distance measuring zones; means for varying a focal plane of said camera; and means for detecting a distribution pattern of objects in said plurality of object distance measuring zones, said detecting means controlling said focal plane varying means to set an in-focus condition with respect to objects in at least two of said plurality of object distance measuring zones, wherein said focal plane varying means comprises means for adjusting an angle of an optical axis of a lens associated with said camera with respect to a film plane associated with said camera. ### Claim 11 An image forming apparatus, comprising: a variable position focal plane; a plurality of object distance measuring zones; and a detector that detects a distribution pattern of objects in said plurality of object distance measuring zones so as to control a varying of an orientation of said variable position focal plane with respect to a field curvature and obtain an in-focus condition with respect to objects in at least two of said plurality of object distance measuring zones. ### Claim 12 (depends on 11) The image forming apparatus of claim 11, wherein said imaging apparatus comprises a camera. ### Claim 13 (depends on 12) The image forming apparatus of claim 12, wherein said camera comprises an autofocus camera. ### Claim 14 An image forming apparatus, comprising: a variable position focal plane; a plurality of object distance measuring zones; and a detector that detects a distribution pattern of objects in said plurality of object distance measuring zones so as to control a varying of said variable position focal plane and obtain an in-focus condition with respect to objects in at least two of said plurality of object distance measuring zones, wherein said variable position focal plane comprises means for adjusting an angle of an optical axis of a lens associated with said image forming apparatus with respect to a film plane associated with said image forming apparatus.