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Optical encoder | Optischer Kodierer | Encodeur optique

Patentnummer:EP2492648B1
IPC Hauptklasse:G01D0005347
Anmelder:
Erfinder:
Anmeldung:27.02.12
Offenlegung:28.02.11
Patenterteilung:12.12.18

Abstract / Hauptanspruch
An optical encoder includes a light source (1), a scale (2) 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 (9) which detects transmitting light or reflected light from the scale which are emitted from the light source, a signal processing means (101) including first initial-stage amplifier means that generates a position detection signal from the photo detector array, and a control means that uses an output signal from the first initial-stage amplifier means 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.

EP2492648B1


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