LENS INTERCHANGEABLE DIGITAL CAMERA SYSTEM
PROBLEM TO BE SOLVED: To achieve accurate AF operation even if there are time lag or variation resulting from communication or the like between a camera body and an interchangeable lens unit, and a difference in a storage time of each range-finding point of a multi AF sensor. SOLUTION: In the multi...
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| creator | TANI NAOAKI |
| description | PROBLEM TO BE SOLVED: To achieve accurate AF operation even if there are time lag or variation resulting from communication or the like between a camera body and an interchangeable lens unit, and a difference in a storage time of each range-finding point of a multi AF sensor. SOLUTION: In the multi AF sensor 15 of the camera body 10, defocus amounts at a plurality of range-finding points in an image plane are detected by a phase difference detection system, a storage synchronization pulse signal synchronizing with a storage period corresponding to the plurality of range-finding points is fed to an interchangeable lens unit 20 side from a camera microcomputer 11 of the camera body through a synchronizing pulse communication path 31, and also a selected point time correction value for the storage synchronization pulse signal is fed according to the storage time at the selected range-finding point out of the plurality of range-finding points to the interchangeable lens unit 20 side from the camera microcomputer 11 through a data communication path 30, then the position of a focus lens 22 corresponding to the storage period of the selected range-finding point by using the defocus amount and the selected point time correction value fed from the camera body, is calculated by a lens microcomputer 21 on the interchangeable lens unit side, and is transmitted to the camera body. COPYRIGHT: (C)2010,JPO&INPIT |
| format | Patent |
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SOLUTION: In the multi AF sensor 15 of the camera body 10, defocus amounts at a plurality of range-finding points in an image plane are detected by a phase difference detection system, a storage synchronization pulse signal synchronizing with a storage period corresponding to the plurality of range-finding points is fed to an interchangeable lens unit 20 side from a camera microcomputer 11 of the camera body through a synchronizing pulse communication path 31, and also a selected point time correction value for the storage synchronization pulse signal is fed according to the storage time at the selected range-finding point out of the plurality of range-finding points to the interchangeable lens unit 20 side from the camera microcomputer 11 through a data communication path 30, then the position of a focus lens 22 corresponding to the storage period of the selected range-finding point by using the defocus amount and the selected point time correction value fed from the camera body, is calculated by a lens microcomputer 21 on the interchangeable lens unit side, and is transmitted to the camera body. COPYRIGHT: (C)2010,JPO&INPIT</description><language>eng</language><subject>ACCESSORIES THEREFOR ; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES ; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM ; CINEMATOGRAPHY ; ELECTRIC COMMUNICATION TECHNIQUE ; ELECTRICITY ; ELECTROGRAPHY ; HOLOGRAPHY ; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS ; OPTICS ; PHOTOGRAPHY ; PHYSICS ; PICTORIAL COMMUNICATION, e.g. TELEVISION</subject><creationdate>2009</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20091217&DB=EPODOC&CC=JP&NR=2009294471A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25562,76317</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20091217&DB=EPODOC&CC=JP&NR=2009294471A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>TANI NAOAKI</creatorcontrib><title>LENS INTERCHANGEABLE DIGITAL CAMERA SYSTEM</title><description>PROBLEM TO BE SOLVED: To achieve accurate AF operation even if there are time lag or variation resulting from communication or the like between a camera body and an interchangeable lens unit, and a difference in a storage time of each range-finding point of a multi AF sensor. SOLUTION: In the multi AF sensor 15 of the camera body 10, defocus amounts at a plurality of range-finding points in an image plane are detected by a phase difference detection system, a storage synchronization pulse signal synchronizing with a storage period corresponding to the plurality of range-finding points is fed to an interchangeable lens unit 20 side from a camera microcomputer 11 of the camera body through a synchronizing pulse communication path 31, and also a selected point time correction value for the storage synchronization pulse signal is fed according to the storage time at the selected range-finding point out of the plurality of range-finding points to the interchangeable lens unit 20 side from the camera microcomputer 11 through a data communication path 30, then the position of a focus lens 22 corresponding to the storage period of the selected range-finding point by using the defocus amount and the selected point time correction value fed from the camera body, is calculated by a lens microcomputer 21 on the interchangeable lens unit side, and is transmitted to the camera body. COPYRIGHT: (C)2010,JPO&INPIT</description><subject>ACCESSORIES THEREFOR</subject><subject>APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES</subject><subject>APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM</subject><subject>CINEMATOGRAPHY</subject><subject>ELECTRIC COMMUNICATION TECHNIQUE</subject><subject>ELECTRICITY</subject><subject>ELECTROGRAPHY</subject><subject>HOLOGRAPHY</subject><subject>OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS</subject><subject>OPTICS</subject><subject>PHOTOGRAPHY</subject><subject>PHYSICS</subject><subject>PICTORIAL COMMUNICATION, e.g. TELEVISION</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2009</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZNDycfULVvD0C3ENcvZw9HN3dXTycVVw8XT3DHH0UXB29HUNclQIjgwOcfXlYWBNS8wpTuWF0twMSm6uIc4euqkF-fGpxQWJyal5qSXxXgFGBgaWRpYmJuaGjsZEKQIAj70lCw</recordid><startdate>20091217</startdate><enddate>20091217</enddate><creator>TANI NAOAKI</creator><scope>EVB</scope></search><sort><creationdate>20091217</creationdate><title>LENS INTERCHANGEABLE DIGITAL CAMERA SYSTEM</title><author>TANI NAOAKI</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_JP2009294471A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2009</creationdate><topic>ACCESSORIES THEREFOR</topic><topic>APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES</topic><topic>APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM</topic><topic>CINEMATOGRAPHY</topic><topic>ELECTRIC COMMUNICATION TECHNIQUE</topic><topic>ELECTRICITY</topic><topic>ELECTROGRAPHY</topic><topic>HOLOGRAPHY</topic><topic>OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS</topic><topic>OPTICS</topic><topic>PHOTOGRAPHY</topic><topic>PHYSICS</topic><topic>PICTORIAL COMMUNICATION, e.g. TELEVISION</topic><toplevel>online_resources</toplevel><creatorcontrib>TANI NAOAKI</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>TANI NAOAKI</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>LENS INTERCHANGEABLE DIGITAL CAMERA SYSTEM</title><date>2009-12-17</date><risdate>2009</risdate><abstract>PROBLEM TO BE SOLVED: To achieve accurate AF operation even if there are time lag or variation resulting from communication or the like between a camera body and an interchangeable lens unit, and a difference in a storage time of each range-finding point of a multi AF sensor. SOLUTION: In the multi AF sensor 15 of the camera body 10, defocus amounts at a plurality of range-finding points in an image plane are detected by a phase difference detection system, a storage synchronization pulse signal synchronizing with a storage period corresponding to the plurality of range-finding points is fed to an interchangeable lens unit 20 side from a camera microcomputer 11 of the camera body through a synchronizing pulse communication path 31, and also a selected point time correction value for the storage synchronization pulse signal is fed according to the storage time at the selected range-finding point out of the plurality of range-finding points to the interchangeable lens unit 20 side from the camera microcomputer 11 through a data communication path 30, then the position of a focus lens 22 corresponding to the storage period of the selected range-finding point by using the defocus amount and the selected point time correction value fed from the camera body, is calculated by a lens microcomputer 21 on the interchangeable lens unit side, and is transmitted to the camera body. COPYRIGHT: (C)2010,JPO&INPIT</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CINEMATOGRAPHY ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ELECTROGRAPHY HOLOGRAPHY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHOTOGRAPHY PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION |
| title | LENS INTERCHANGEABLE DIGITAL CAMERA SYSTEM |
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