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:
Jan. 07, 1986
Filed:
May. 24, 1985
Robert L Bell, Chatsworth, CA (US);
Bell Microcomponents, Inc., Newbury Park, CA (US);
Abstract
A capacitive pressure transducer is comprised of a deflectable diaphragm and a substantially planar reference plate, both preferably molded of ceramic. The diaphragm includes a sensor electrode ring disposed about a central region thereof and a concentric reference electrode ring substantially encompassing the sensor electrode, with a guard ring between the electrodes to electrically isolate the reference electrode from the sensor electrode. The reference plate is disposed in facing relation to the deformable flat surface of the diaphragm and includes a sensor electrode ring disposed and in opposition to the sensor electrode on the diaphragm to form a sensing capacitor therewith. Spacer means disposed in the central region between the diaphragm and the reference plate intercouple the two elements and maintain a substantially fixed dimension in the central region therebetween while permitting deformation of the diaphragm in response to pressure variations. The spacer means is conductive and facilitates electrical connection to the sensor electrode on the reference plate. A cover is disposed about the reference plate and coupled to the periphery of the diaphragm, and includes a reference electrode ring in facing relation to the reference electrode on the diaphragm to form a reference capacitor therewith.