Title:
REFLECTIVE GRATING RULER
Document Type and Number:
WIPO Patent Application WO/2021/196809
Kind Code:
A1
Abstract:
Disclosed is a reflective grating ruler, comprising a light source (1), a lens (2), a main grating ruler (3), an auxiliary grating ruler (4), and a receiving unit (5), wherein a first grating stripe (31) is provided on the main grating ruler (3), and a second grating stripe (41) corresponding to the first grating stripe (31) is provided on the auxiliary grating ruler (4); the receiving unit (5) and the auxiliary grating ruler (4) are arranged opposite each other, in parallel and in a manner of being spaced apart; the light source (1) is provided on the lens (2); the first grating stripe (31) comprises an RI code channel (311) and an incremental code channel (312); the RI code channel (311) successively comprises a first non-light-reflecting region (3111), an incremental code channel region (3112), a first reflective region (3113), an incremental code channel region (3114), a first non-reflective region (3115), an incremental code channel region (3116), a second reflective region (3117), and a second non-light-reflecting region (3118); and a receiving region (51) is provided at the position, corresponding to the RI code channel (311), on the receiving unit (5), and the receiving region (51) successively comprises a Z+ signal region, an A+ signal region, a B+ signal region, an A- signal region, a B- signal region, and a Z- signal region. Even though the distance from the main grating ruler (3) to the auxiliary grating ruler (4) is extended to a Fresnel focal plane, an RI signal is still strong and an RI trigger position is precise.
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Inventors:
WU MENGLIANG (CN)
LI LIQIANG (CN)
LI KANGHUI (CN)
WU HAIMING (CN)
LI LIQIANG (CN)
LI KANGHUI (CN)
WU HAIMING (CN)
Application Number:
PCT/CN2021/000029
Publication Date:
October 07, 2021
Filing Date:
February 23, 2021
Export Citation:
Assignee:
GUANG DONG RATIONAL PREC INSTRUMENT CO LTD (CN)
International Classes:
G01D5/38
Foreign References:
| CN202362000U | 2012-08-01 | |||
| CN108362208A | 2018-08-03 | |||
| CN102788602A | 2012-11-21 | |||
| CN109724519A | 2019-05-07 | |||
| CN105890634A | 2016-08-24 | |||
| CN105758435A | 2016-07-13 | |||
| DE102013203713A1 | 2014-02-13 |
Other References:
DING HONGCHANG: "The Principle and Realization of an Absolute Grating Linear Encoder Based on The Single-track", CHINESE DOCTORAL DISSERTATIONS FULL-TEXT DATABASE, UNIVERSITY OF CHINESE ACADEMY OF SCIENCES, CN, no. 2, 15 February 2017 (2017-02-15), CN, XP055853976, ISSN: 1674-022X
Attorney, Agent or Firm:
GUANGZHOU ESON PATENT & TRADEMARK AGENCY CO., LTD. (CN)
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