Konfiguration mit mehreren Wellenlänge für einen optischen Codierlesekopf

Details

Veröffentlichungs-Nr.

EP2653838

Aktenzeichen

EP13157415

Anmeldetag

1. März 2013

Veröffentlichung

19. Dezember 2018

Erteilung

19. Dezember 2018

Rechtsraum

EP

IPC

G01D5/38G01D5/26

Abstract

A readhead and scale arrangement 1000 comprises: a readhead 100 comprising a light source 180 configured to output diverging source light 150 comprising a plurality of individually detected wavelengths and at least a first optical signal receiver channel configured to provide a first set of position signals; and a scale track 86 extending along the measuring axis 82 direction on a scale member 81 comprising a scale grating 80, the scale track 86 configured to diffract the first diverging source light to provide first and second diffracted scale light portions of each of the individually detected wavelengths to the first optical signal receiver channel which provide interference fringes. The readhead 100 comprises an optical path difference element 365, arranged such that respective wavelengths undergo different phase shifts. Such an encoder is robust to scale track contamination and other signal degradation.

Anmelder

Firma

Mitutoyo Corporation

Land

🇯🇵 Japan

Fachgebiete