Invention Application
- Patent Title: Projection-type rotary encoder
- Patent Title (中): 投影式旋转编码器
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Application No.: US10790785Application Date: 2004-03-03
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Publication No.: US20040183701A1Publication Date: 2004-09-23
- Inventor: Muneo Mitamura , Yoshinori Ito , Sadaharu Kanamori
- Applicant: Harmonic Drive Systems Inc.
- Applicant Address: null
- Assignee: Harmonic Drive Systems Inc.
- Current Assignee: Harmonic Drive Systems Inc.
- Current Assignee Address: null
- Priority: JPJP2003-059983 20030306
- Main IPC: H03M001/22
- IPC: H03M001/22 ; G01D005/34
Abstract:
A projection-type rotary encoder is provided which has a light source, an object grating plate in which a substantially fan-shaped object grating for transmitting light is arranged at constant angular intervals in the circumferential direction, a rotary scale plate in which a substantially fan-shaped scale grating for transmitting light is arranged at constant angular intervals in the circumferential direction, and a photodiode grating plate in which a substantially fan-shaped photodiode photosensitive surface grating is arranged at constant angular intervals in the circumferential direction. A scale grating 32A is formed in the rotary scale plate with a shape and size that correspond to a light image of the object grating 31A incident on the surface thereof. A photodiode photosensitive surface grating 33A is formed in the photodiode grating plate with a shape and size that correspond to a light image of the scale grating 32A incident on the surface thereof.
Information query
