Optical rotation angle measuring system

US10634523B2 · kind B2 · utility

Assignee

• Arges GmbH · DE

Inventors

• Markus Guggenmos · Schwandorf, DE
• Martin Hartmann · Windisch, CH
• Bernhard Kiesbauer · Pleystein, DE
• Christiaan H. F. Velzel · Deurne, NL
• Sven Pekelder · Eindhoven, NL
• Rinze Frederik van der Kluit · Eindhoven, NL

Key dates

• Filing date: May 3, 2017
• Grant date: Apr 28, 2020
• Expiry date: May 3, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/38
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The present invention is directed to an optical system for measuring the rotation angle of rotatable object having a rotation shaft (2), which system comprises a reflective diffraction element (6) mounted on said shaft and a module that includes a radiation source (8) emitting a monochromatic beam (bo) towards this element and a radiation-sensitive detection structure (14, 16), the diffraction element is configured to project diffraction order images (18) of its pattern onto associated sections (50(1)-54(2)) of an annular grating structure forming part of the detection structure and the surface size of the diffraction element is smaller than 20% of the surface size of the annular grating structure.