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. 08, 1977
Filed:
Dec. 16, 1974
Claude Pelletier, Annecy, FR;
Roger Velte, Annecy-le-Vieux, FR;
Abstract
A device for measuring spatial displacement comprises two similar elementary capacitors of a differential capacitor and which share a common movable armature and the two capacitors are used to produce respective pulses whose lengths are compared to produce a third pulse whose length is proportional to the displacement of the armature. In a preferred embodiment, the capacitors are switched in alternation into an oscillating circuit and serve to determine the frequency of oscillation thereof and the time taken for a fixed number of oscillations to be produced with each capacitor switched in is measured to produce the first and second pulses. An adder/subtractor counter is provided which provides a fourth pulse whose length is equal to twice that of the first pulse and the fourth pulse is compared with a pulse whose length equals the sum of the first and second pulses to produce the third pulse.