Codierer und Vorrichtung damit

Details

Veröffentlichungs-Nr.

EP2581713

Aktenzeichen

EP12188101

Anmeldetag

11. Oktober 2012

Veröffentlichung

12. Dezember 2018

Erteilung

12. Dezember 2018

Rechtsraum

EP

IPC

G01D5/347

Abstract

The encoder includes a scale (10) including first and second periodic patterns (11, 12), and a detector (22) relatively movable with respect to the scale and whose detection state is switchable between a first detection state to read the first periodic pattern and output a first signal and a second detection state to read the second periodic pattern and output a second signal. A processor (40) performs a first process to detect a first absolute position by using the first and second signals and then performs a second process to calculate a relative movement amount by using a specific signal that is one of the first and second signals and detect a second absolute position by using the relative movement amount and the first absolute position. The specific signal is obtained from the detector set in a same detection state as that set last in the first process.

Anmelder

Firma

Canon Kabushiki Kaisha

Land

🇯🇵 Japan

Fachgebiete