Fotoelektrischer Kodierer

Details

Veröffentlichungs-Nr.

EP2629063

Aktenzeichen

EP13155387

Anmeldetag

15. Februar 2013

Veröffentlichung

24. Oktober 2018

Erteilung

24. Oktober 2018

Rechtsraum

EP

IPC

G01D5/34G01D5/347

Abstract

A photoelectric encoder includes an irradiation unit (10) configured to apply first and second irradiation light beams (L1a,L1b) having a first linear polarization direction, a scale (20) configured to produce first and second diffraction light beams having the first linear polarization direction by diffracting the first and second irradiation light beams, respectively, the scale having a glass plate whose front surface has a grating shape (21), a polarizing unit (30) configured to convert the first diffraction light beam into a third diffraction light beam (L2c) having a second linear polarization direction which is perpendicular to the first linear polarization direction, to produce first and second composite light beams by combining the second diffraction light beam and the third diffraction light beam, and to convert the first composite light beam into a circularly polarized third composite light beam, and a light receiver configured to receive the second composite light beam and the third composite light beam.

Anmelder

Firma

Mitutoyo Corporation

Land

🇯🇵 Japan

Fachgebiete