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Optical encoder having a high resolution detection mode to detect a fine pitch pattern and a low resolution detection mode to detect a coarse pitch pattern
Optical encoder having a high resolution detection mode to detect a fine pitch pattern and a low resolution detection mode to detect a coarse pitch pattern
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机译:光学编码器具有用于检测精细间距图案的高分辨率检测模式和用于检测粗略间距图案的低分辨率检测模式
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摘要
An optical encoder includes a light source, a scale which is irradiated by the light source and has a fine pitch pattern and a coarse pitch pattern in one track, a photo detector array which detects transmitting light or reflected light from the scale which are emitted from the light source, a signal processing unit including a first initial-stage amplifier unit that generates a position detection signal from the photo detector array, and a control unit that uses an output signal from the first initial-stage amplifier unit to control a light amount variation of the light source. The optical encoder can operate in a high resolution detection mode that forms the photo detector array at a first pitch to detect the fine pitch pattern and a low resolution detection mode that forms the photo detector array at a second pitch to detect the coarse pitch pattern.
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