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:
Mar. 14, 1989
Filed:
Aug. 27, 1987
Meinolph Kaufmann, Baden, CH;
Karl Kloti, Fislisbach, CH;
Jurgen Nehring, Wettingen, CH;
Hanspeter Schad, Rieden, CH;
BBC Brown Boveri AG, Baden, CH;
Abstract
An optoelectronic displacement sensor for the absolute measurement of displacement in the sub-micrometer range is described, which is constructed, according to an exemplary embodiment, with a light-emitting diode (L) as light source and two photodiodes (D1, D2), which are arranged in a difference circuit and which are opposite to one another, as radiation sensors. The sensing of displacement takes place by means of a diaphragm (2), which is displaceable between light source and radiation sensors and which influences the illumination received by of the photodiodes (D1, D2). For the homogenization of the illumination, special means are provided, which, according to an exemplary embodiment, consist of a correction filter (6) disposed in the beam path.