Invention Grant
- Patent Title: Encoder, optical module and servo system including plural light receiving elements having respective shapes with respect to a point light source
- Patent Title (中): 编码器，光学模块和伺服系统包括相对于点光源具有各自形状的多个光接收元件
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Application No.: US13368340Application Date: 2012-02-08
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Publication No.: US08674287B2Publication Date: 2014-03-18
- Inventor: Yasushi Yoshida , Shirou Yoshidomi , Yasuhiro Matsutani , Jiro Muraoka
- Applicant: Yasushi Yoshida , Shirou Yoshidomi , Yasuhiro Matsutani , Jiro Muraoka
- Applicant Address: JP Kitakyushu-Shi
- Assignee: Kabushiki Kaisha Yaskawa Denki
- Current Assignee: Kabushiki Kaisha Yaskawa Denki
- Current Assignee Address: JP Kitakyushu-Shi
- Agency: Ditthavong Mori & Steiner, P.C.
- Priority: JP2011-027255 20110210
- Main IPC: G01D5/34
- IPC: G01D5/34
Abstract:
An encoder includes a slit array along a first measurement axis, and an optical module capable of relatively moving with respect to the slit array. The optical module comprises a point light source that irradiates the part of the slit array, and a light receiving array comprising a plurality of light receiving elements along a second measurement axis and arranged in positions offset with respect to the point light source. The light receiving elements is receiving light irradiated from the point light source and reflected from the reflection slit. The plurality of light receiving elements comprises respective shapes such that the light receiving element nearer to the point light source comprises a shorter length in a width direction and end parts on an opposite side of the light receiving element with respect to the point light source are arranged side by side in positions along the second measurement axis.
Public/Granted literature
- US20120205527A1 ENCODER, OPTICAL MODULE AND SERVO SYSTEM Public/Granted day:2012-08-16
Information query
IPC分类:
