Patent · US Expired

Optical position measuring device

US6175414A · kind A · utility

16Cited by

7References

11Claims

0Family size

Assignee

DR. JOHANNES HEIDENHAIN GMBH · DE

Inventors

Wolfgang Holzapfel · Obing, DE
Volker Hofer · Traunreut, DE
Walter Huber · Traunstein, DE

Key dates

Filing date	Nov 18, 1999
Grant date	Jan 16, 2001
Priority date	—
Expiry date	Nov 18, 2019

Classification

Technology area (CPC G)Physics
CPC primaryG01D5/366
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

An optical position measuring device is described for determining the relative position of two objects that are movable in a measuring direction with respect to each other. The position measuring device includes a scale having a scale reference mark structure, which is composed of n blocks arranged in the measuring direction with partial areas of varying optical characteristics. A scanning unit is also included, with a scanning reference pulse structure as well as a plurality of detector elements. Output signals are generated by the detector elements, which at a defined relative position of the two objects, have a maximum or a minimum value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.