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ABSOLUTE POSITION DETECTION TYPE PHOTOELECTRIC ENCODER | PHOTOELEKTRISCHER CODIERER VOM ABSOLUTPOSITIONSDETEKTIONSTYP | ENCODEUR PHOTOÉLECTRIQUE DE TYPE À DÉTECTION DE POSITION ABSOLUE

Patentnummer:EP3141874B1
IPC Hauptklasse:G01D0005347
Anmelder:Mitutoyo Corporation (0)
20-1, Sakado 1-chome, ; Takatsu-ku, ; Kawasaki, Kanagawa 213-0012, JP
Erfinder:
Anmeldung:08.09.16
Offenlegung:14.09.15
Patenterteilung:26.12.18

Abstract / Hauptanspruch
There is provided an absolute position detection type photoelectric encoder which improves robustness to dirt while maintaining high resolution. A two-level code pattern according to a pseudo random code sequence is provided on a scale along a length measurement direction. Each code of the two-level code pattern indicates a code "1" or a code "0", and includes two bits. Each of the two bits is L or H. The code "1" is represented by an A pattern which is a combination of L and H, and the code "0" is represented by a B pattern which is a combination of L and L or a C pattern which is a combination of H and H. When the codes "0" are continued, the B pattern and the C pattern are alternately used.

EP3141874B1


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