Optical position-measuring device

US9482517B2 · kind B2 · utility

Assignee

• DR. JOHANNES HEIDENHAIN GMBH · DE

Inventors

• Wolfgang Holzapfel · Obing, DE
• Jörg Drescher · Samerberg, DE
• Markus Meissner · Teupitz, DE

Key dates

• Filing date: Oct 7, 2014
• Grant date: Nov 1, 2016
• Expiry date: Oct 7, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G01J1/0403
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An optical position-measuring device includes a measuring standard as well as a scanning unit movable relative to it along at least one measuring direction, a scanning beam path being formed between the measuring standard and scanning unit and being used to generate displacement-dependent signals. A protective cap is disposed in a manner allowing movement along an axis perpendicular to the measuring-standard plane such that in at least one operating mode, the protective cap for the most part surrounds the scanning beam path between the scanning unit and measuring standard.