Codierer

Details

Veröffentlichungs-Nr.

EP2511666

Aktenzeichen

EP12163898

Anmeldetag

12. April 2012

Veröffentlichung

3. Juli 2019

Erteilung

3. Juli 2019

Rechtsraum

EP

IPC

G01D5/26G01D5/347

Abstract

An encoder includes a scale (20) that includes a pattern row, a detector array (16), and a signal processor (30). The pattern row has a plurality of different modulation periods in the moving direction, an amplitude of the energy distribution in the pattern having at least one modulation period being configured to change with a position of the scale in the moving direction. The signal processor acquirers an amplitude of an energy distribution of a corresponding modulation period based on an output signal from the detector array, and an amplitude signal obtained by normalizing a plurality of amplitudes obtained by the plurality of amplitude acquirers, the amplitude signal serving as a position signal representative of the position of the scale.

Anmelder

Firma

Canon Kabushiki Kaisha

Land

🇯🇵 Japan

Fachgebiete