Position-measuring device and system having such a position-measuring device

US9389065B2 · kind B2 · utility

Assignee

• DR. JOHANNES HEIDENHAIN GMBH · DE

Inventors

• Wolfgang Holzapfel · Obing, DE
• Joerg Drescher · Riedering, DE
• Markus Meissner · Teupitz, DE
• Ralph Joerger · Traunstein, DE
• Bernhard Musch · Otterfing, DE
• Thomas Kaelberer · Schrobenhausen, DE

Key dates

• Filing date: Mar 18, 2013
• Grant date: Jul 12, 2016
• Expiry date: May 21, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D2205/90
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A position-measuring device, as well as a system having such a position-measuring device, is used for determining the position of a first object relative to a second object, the first and the second object being movable relative to one another along at least two measuring directions. The position-measuring device has an optical unit that is linked to one of the two objects and includes at least one light source, a detector system, as well as further optical elements in a defined configuration. In addition, the position-measuring device includes a measuring standard-reflector unit, which is provided on the other object, and has at least two differently formed regions in one track that are optically scannable by the optical unit for position sensing. The different formation of the regions makes switching among the various measuring directions possible during position sensing, and positional signals can be generated by the optical unit relative to the relative movement of the two objects for each measuring direction.