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:
Dec. 09, 1986
Filed:
Feb. 27, 1984
Walter Schmitt, Traunreut, DE;
Dr. Johannes Heidenhain GmbH, Traunreut, DE;
Abstract
A digital electric length or angle measuring system includes a scanning unit for scanning a measuring scale and an evaluating circuit for evaluating scanning units generated by a plurality of scanning elements of the scanning unit. The scanning elements are connected to differential amplifiers included in the evaluating circuit. In order to balance faulty signal parameters of the scanning signals of the scanning elements, a balancing circuit is provided which includes bridge circuits. In each case, one diagonal of the bridge circuit is circuited in parallel to the scanning elements in the scanning unit and is connected to the inputs of the differential amplifier of the evaluating arrangement. Furthermore, each of the bridge circuits includes at least one balancing element such as a photosensor.