Invention Grant
US08106992B2 Automatic focusing system using a magnification or reduction optical system
失效
使用放大或缩小光学系统的自动聚焦系统
- Patent Title: Automatic focusing system using a magnification or reduction optical system
- Patent Title (中): 使用放大或缩小光学系统的自动聚焦系统
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Application No.: US12019447Application Date: 2008-01-24
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Publication No.: US08106992B2Publication Date: 2012-01-31
- Inventor: Atsushi Kanayama
- Applicant: Atsushi Kanayama
- Applicant Address: JP Saitama-Shi
- Assignee: Fujinon Corporation
- Current Assignee: Fujinon Corporation
- Current Assignee Address: JP Saitama-Shi
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JPP2007-065658 20070314
- Main IPC: H04N5/225
- IPC: H04N5/225 ; H04N5/228

Abstract:
A taking lens 10 of an automatic focusing system of an optical path length difference type is configured so that AF object light is branched from a main optical path that guides object light to a video imaging device 26 of a camera main body 14, and object images are formed on AF imaging devices 22A and 22B. A ⅔ type CCD is used as the video imaging device 26, and a ⅓ type CCD, that is easily available and cheap, is used as the AF imaging devices 22A and 22B. In view of that sizes of the AF imaging devices 22A and 22B are smaller than that of the video imaging device 26, the object images formed on the AF imaging devices 22A and 22B are reduced by a reduction optical system 17.
Public/Granted literature
- US20080225159A1 AUTOMATIC FOCUSING SYSTEM Public/Granted day:2008-09-18
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