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:
Apr. 23, 1985
Filed:
Mar. 09, 1983
Horst Burkhardt, Truchtlaching, DE;
Dr. Johannes Heidenhain GmbH, Traunreut, DE;
Abstract
A length measuring system of the type having a division on a scale which is scanned by a scanning unit in order to measure the relative position of a slide with respect to a bed of a machine is disclosed. In order to correct division errors and/or machine errors between a follower fastened to the slide and the scanning unit, there is arranged an electromechanical adjusting element between the follower and the slide. In a first preferred embodiment, this adjusting element takes the form of a piezoelectric element, which, in accordance with electric correction signals applied thereto, varies in length and thereby corrects the relative position of the scanning unit and the follower in accordance with the desired error correction course. Alternate embodiments employ magnetostrictive cores and electromagnetic coil arrangements to accomplish the desired error correction.