发明申请
US20140306099A1 OPTICAL SCALE, METHOD FOR MANUFACTURING OPTICAL SCALE, AND OPTICAL ENCODER
有权
光学尺度,制造光学尺度的方法和光学编码器
- 专利标题: OPTICAL SCALE, METHOD FOR MANUFACTURING OPTICAL SCALE, AND OPTICAL ENCODER
- 专利标题(中): 光学尺度,制造光学尺度的方法和光学编码器
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申请号: US14355149申请日: 2012-10-31
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公开(公告)号: US20140306099A1公开(公告)日: 2014-10-16
- 发明人: Toshiaki Oguchi , Kunihiko Sasano , Sumio Sugita
- 申请人: Toshiaki Oguchi , Kunihiko Sasano , Sumio Sugita
- 申请人地址: JP Shinagawa-ku, Tokyo
- 专利权人: NSK LTD.
- 当前专利权人: NSK LTD.
- 当前专利权人地址: JP Shinagawa-ku, Tokyo
- 优先权: JP2011-239795 20111031; JP2011-239797 20111031; JP2011-239800 20111031; JP2012-190487 20120830
- 国际申请: PCT/JP2012/078169 WO 20121031
- 主分类号: G01D5/347
- IPC分类号: G01D5/347
摘要:
An optical scale, a method for manufacturing an optical scale, and an optical encoder less affected by fluctuations in the amount of detected light and with an improved resolution are provided. The optical scale includes a plurality of wires provided thereon so that the plurality of wires do not intersect each other and each of the tangential directions of the respective wires changes continuously. The optical encoder includes the optical scale, a light source, an optical sensor, and a computing unit. The optical sensor includes a first polarizing layer that splits incident light that is light source light from the light source passed through or reflected on the optical scale and being incident on the first polarizing layer to a first polarization direction, a second polarizing layer that splits the incident light to a second polarization direction, a first photoreceiver that receives first polarized light split by the first polarizing layer, and a second photoreceiver that receives second polarized light split by the second polarizing layer.