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:
Jul. 03, 1990
Filed:
Jul. 24, 1987
Olivier Parriaux, Lausanne, CH;
Francois Cochet, Neuchatel, FR;
Dr. Johannes Heidenhain GmbH, Traunreut, DE;
Abstract
The invention relates to an interferometric displacement measuring device in which the reference norm is a diffraction grid (G). Diffracted partial beam bundles (+m, -m) are fed into a coupler (TBJ) by means of coupling grids (+HG, -HG) via beam waveguides (+LWL, -LWL) and there brought into interference. The interfering partial beam bundles are transmitted from the outputs (+A, A, -A) via beam waveguides (+LWL, LWL, -LWL) to detectors (+D, D, -D) which convert them into electric signals out-of-phase with each other. The displacement of the diffraction grid (G) is a standard for measuring the changes in position of machine components which are movable relative to one another.