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:
Nov. 12, 1996
Filed:
Aug. 01, 1994
Dieter Kr okel, Lindau, DE;
Andreas Schiff, Eriskirch, DE;
i f m electronic GmbH, , DE;
Abstract
A process and a device for increasing interference suppression, especially in optical proximity switches, with an optical transmitter emitting an optical pulse train (1), an optical receiver emitting a measuring signal (2) and a control and evaluation unit controlling the optical transmitter and evaluating measuring signal (2), in which the measuring signal (2) of the optical receiver includes a superposition of a constantly emitted interference background (4) and a measuring pulse (6) emitted when receiving an optical pulse (5), and in which the measuring signal (2) of the optical receiver is evaluated by the control and evaluation unit in a signal interval (8) during a measuring pulse (6) and in at least one background interval (9) outside measuring pulse (6). The increase of the interference suppression is assured in that the evaluation is interrupted by gaps (11, 12) before and after the signal intervals (8) or background intervals (9).