Optischer Kodierer mit anpassbarer Auflösung

Details

Veröffentlichungs-Nr.

EP2607858

Aktenzeichen

EP12198964

Anmeldetag

21. Dezember 2012

Veröffentlichung

15. März 2017

Erteilung

15. März 2017

Rechtsraum

EP

IPC

G01D5/245G01D5/347

Abstract

A flexible optical displacement encoder configuration uses a source grating (115) to illuminate a scale with structured light such that light from the scale is modulated with a beat frequency envelope which may have a relatively coarse pitch that matches a desired detector pitch. An imaging configuration (180) provides spatial filtering to remove the high spatial frequencies from the modulation envelope to provide a clean signal in the detected fringe pattern. This combination of elements allows an incremental scale track pattern with a relatively finer pitch (e.g., 4, 5, 8 microns) to provide fringes with a coarser pitch (e.g., 20 microns) at a detector. Various scale resolutions can use a corresponding source grating such that all combinations can produce detector fringes that match the same economical detector component.

Anmelder

Firma

Mitutoyo Corporation

Land

🇯🇵 Japan

Fachgebiete