发明授权
- 专利标题： Rotary disk eccentricity measurement method, rotary encoder, and image forming apparatus including the rotary encoder
- 专利标题（中）： 旋转盘偏心测量方法，旋转编码器和包括旋转编码器的成像设备
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申请号： US12611219申请日： 2009-11-03
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公开(公告)号： US08138468B2公开(公告)日： 2012-03-20
- 发明人: Kenji Maeda
- 申请人： Kenji Maeda
- 申请人地址： JP Tokyo
- 专利权人： Ricoh Company, Ltd.
- 当前专利权人： Ricoh Company, Ltd.
- 当前专利权人地址： JP Tokyo
- 代理机构： Cooper & Dunham LLP
- 优先权： JP2008-296818 20081120
- 主分类号： G01D5/34
- IPC分类号： G01D5/34
摘要：
An eccentricity measurement method of measuring the eccentricity of a rotary disk of a rotary encoder includes forming, on the rotary disk, at least one first straight-line pattern group in a different radial direction including a plurality of straight-line patterns that are equally spaced in the radial direction and extend in a normal line direction from a base point a predetermined distance away from a center of a radial scale of the rotary disk; placing the rotary disk on a table including at least one second straight-line pattern group including straight-line patterns; and measuring the amount and the direction of the eccentricity of the rotary disk in accordance with the position of the straight-line pattern of the first straight-line pattern group that coincides with the position of the straight line pattern of the second straight-line pattern group in the radial direction.
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