发明授权
US08755094B2 Method of measuring irradiation position shift and focus shift in optical scanning apparatus
失效
测量光学扫描装置中的照射位置偏移和聚焦偏移的方法
- 专利标题: Method of measuring irradiation position shift and focus shift in optical scanning apparatus
- 专利标题(中): 测量光学扫描装置中的照射位置偏移和聚焦偏移的方法
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申请号: US13454289申请日: 2012-04-24
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公开(公告)号: US08755094B2公开(公告)日: 2014-06-17
- 发明人: Yasuaki Otoguro
- 申请人: Yasuaki Otoguro
- 申请人地址: JP Tokyo
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 当前专利权人地址: JP Tokyo
- 代理机构: Fitzpatrick, Cella, Harper & Scinto
- 优先权: JP2011-104737 20110509
- 主分类号: H04N1/04
- IPC分类号: H04N1/04 ; H04N1/23 ; G06K15/10 ; H04N1/60 ; G03F3/08 ; G02B13/16 ; G01B9/00 ; B41J27/00 ; G01D5/36
摘要:
A pupil splitting lens that splits a pupil of a light beam from a deflector into a plurality of light beams in a main scanning direction of the deflector and a pupil splitting lens that splits the light beam into a plurality of light beams in a sub-scanning direction are disposed relative to a light detection element. The light detection element detects image forming positions of the four light beams formed as a result of the splitting by the plurality of pupil splitting lenses. A CPU determines the amount of focus shift and the amount of image forming position shift from these four image forming positions.