The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 06, 1997
Filed:
May. 27, 1994
Alfons Spies, Seebruck, DE;
Josef Muller, Garching, DE;
Dr. Johannes Heidenhain GmbH, Traunreut, DE;
Abstract
A position measuring device having a sensor, the output signal Sd of which is a function of the distance between a graduation and a scanning unit. To render the distance-dependent signal independent of temperature changes, the sensor consists of a potentiometer circuit with an active branch and a complementary branch. Magneto-resistive elements which scan the graduation are disposed in the active branch. Resistive elements are disposed in the complementary branch which have the same temperature behavior as the magneto-resistive elements of the active branch, but are substantially insensitive to magnetic fields. The voltage across the active branch is taken as the distance-dependent measuring signal Sd and is used to control the amplitude of the position-dependent scanning signals generated by scanning the graduation.