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:
Apr. 20, 1984
Hugh C Webber, Detroit, MI (US);
David V Tinder, Dearborn, MI (US);
United Technologies Automotive, Inc., Dearborn, MI (US);
Abstract
An improved method and apparatus are provided for making vibration sensors, particularly of the type used in automotive applications wherein a piezoelectric element is affixed to a flexing plate which is mounted on a support stem in 'umbrella' fashion. A desired resonant vibrating frequency of the sensor is obtained by progressively working a neck portion of the support stem, as by peening, to effectively decrease the vibrating radius of the plate and thus increase its resonant frequency toward and to a desired resonant frequency. The plate's frequency is monitored and the working of the stem neck portion is terminated when a desired resonant frequency is attained. An inclined support shoulder on the stem below the neck portion facilitates the aforementioned manufacture. An undercut positioned in the stem neck portion near its transition into the support shoulder further facilitates the manufacture.