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:
Feb. 20, 1996
Filed:
Jul. 15, 1994
Hermann Meyer, Weissbach, DE;
Sebastian Brandl, Altenmarkt, DE;
Johannes Heidenhain GmbH, Traunreut, DE;
Abstract
A position measuring system with compensation for variable distance between the light source and the index disk. The index disk has a plurality of index lines separated by masked areas. The light source emits beams of light that impinge upon the plane of the index disk at an angle and yet are parallel to the direction of the index lines. The masked areas on the index disk along with the light source positioned at an angle with respect to the axis of the index disk allow the detectors located downstream of the index disk to be maximally illuminated when the index disk is located at its maximum permissible distance from the light source and the detectors are minimally illuminated when the index disk is located at its minimum permissible distance from the light source.