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. 17, 1990
Filed:
Jul. 21, 1989
Wolfgang Jacob-Grinschgl, Munich, DE;
Udo Muller, Unterschleissheim, DE;
Kontron Holding AG, Zurich, CH;
Abstract
A co-ordinate measuring system determines the position of a coil member relative to a grid member defined by a set of equidistant, parallel conductors associated with a co-ordinate axis of the system. The system includes a switching circuit that is constructed and arranged to produce a measuring signal in the form of a train of induced pulses in one of the members when a time variable current is applied to the other of the members. According to the present invention, a low pass filter at the front end of an evaluation circuit is responsive to the measuring signal for reducing frequency components therein due to operation of the switching circuit, and producing an output signal that is the first derivative of the envelope of the time variable magnetic flux. The second zero-axis crossing of the derivative of the output signal yields a representation of the co-ordinate of the coil relative to the grid member.