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:
Jul. 23, 1996
Filed:
Jun. 06, 1995
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A magnetic-flux change-generating device 2 causes amplitude modulation of alternating magnetic flux in accordance with displacement of a movable body, and an amplitude-compensating device (low-pass filter) 4 causes attenuation of amplitude of electromagnetic-induction voltage of a pickup coil 3 substantially proportionally to frequency. When frequency of the alternating magnetic flux (also termed 'carrier frequency') fluctuates, the amplitude of the electromagnetic-induction voltage fluctuates in proportion to the frequency, but because the amplitude of the electromagnetic-induction voltage is caused to be attenuated at an attenuation rate which is substantially proportional to the frequency, displacement can be detected accurately by this amplitude change, irrespective of change in the frequency of the alternating magnetic flux (i.e., the carrier frequency of the electromagnetic-induction voltage).