Invention Grant
- Patent Title: Shadow-cast encoder apparatus with scale and readhead producing a fringe pattern on the detector with a specific harmonic distortion
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Application No.: US16490955Application Date: 2018-03-06
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Publication No.: US11353342B2Publication Date: 2022-06-07
- Inventor: Alexander David McKendrick
- Applicant: RENISHAW PLC
- Applicant Address: GB Wotton-under-Edge
- Assignee: RENISHAW PLC
- Current Assignee: RENISHAW PLC
- Current Assignee Address: GB Wotton-under-Edge
- Agency: Oliff PLC
- Priority: EP17275030 20170307
- International Application: PCT/GB2018/050557 WO 20180306
- International Announcement: WO2018/162886 WO 20180913
- Main IPC: G01D5/347
- IPC: G01D5/347
Abstract:
A shadow-cast encoder apparatus includes a scale and a readhead. The readhead includes at least one electromagnetic radiation source for illuminating the scale in order to produce a shadow-cast fringe pattern at a detector configured to detect the shadow-cast fringe pattern. The encoder apparatus can be configured so as to suppress the total harmonic distortion of the fringe pattern, e.g. such that the total harmonic distortion of the fringe pattern is not more than 6%.
Public/Granted literature
- US20200011712A1 ENCODER APPARATUS Public/Granted day:2020-01-09
Information query
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