发明授权
- 专利标题: Displacement pickup
- 专利标题(中): 位移拾取
-
申请号: US10692376申请日: 2003-10-22
-
公开(公告)号: US07034948B2公开(公告)日: 2006-04-25
- 发明人: Hideaki Tamiya , Kayoko Taniguchi , Akihiro Kuroda
- 申请人: Hideaki Tamiya , Kayoko Taniguchi , Akihiro Kuroda
- 申请人地址: JP Tokyo
- 专利权人: Sony Precision Technology
- 当前专利权人: Sony Precision Technology
- 当前专利权人地址: JP Tokyo
- 代理机构: Haverstock & Owens LLP
- 优先权: JPP2002-308931 20021023
- 主分类号: G01B9/02
- IPC分类号: G01B9/02
摘要:
A displacement pickup is provided which includes a displaceable scale (12) having defined therein a first area (12a) where positional information is recorded with a predetermined pitch and a second area (12b) where positional information is recorded with a predetermined pitch different from that in the first area (12a), a first reading system (10) to read the positional information recorded in the first area (12a), a first phase detector (14) to detect a first phase on the basis of the positional information read by the first reading system (10), a second reading system (11) to read the positional information recorded in the second area (12b), a second phase detector (15) to detect a second phase on the basis of the positional information read by the second reading system (11), a phase comparator (16) to make a comparison between the first and second phases, and an origin signal generator (17) to generate an origin signal according to the result of comparison from the phase comparator (16).
公开/授权文献
- US20040080755A1 Displacement pickup 公开/授权日:2004-04-29