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:
Oct. 30, 2001
Filed:
Nov. 26, 1999
Hannu H. Pulli, Westborough, MA (US);
Frank M. Domzalski, Wellesley, MA (US);
ITT Manufacturing Enterprises, Inc., Wilmington, DE (US);
Abstract
A piezoelectric switch comprising an end surface which when pressure is applied, causes a piezoelectric element to switch and generate an electrical signal. In addition, the piezoelectric element provides audible feedback to an operator activating the switch. The piezoelectric switch comprises a plastic housing having the piezoelectric element adhesively attached to an inside surface of a top portion of the housing. Two wires from the piezoelectric element connect to a printed circuit board which is placed adjacent to the piezoelectric element and wires from the printed circuit board extend through a cap for external connections. When the piezoelectric element switches, an output pulse having a predetermined pulse width is generated along with a signal which is fed back to trigger an oscillator connected to the piezoelectric element causing it to buzz, thereby providing audible feedback from the same piezoelectric element.