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:
Sep. 01, 1992
Filed:
Oct. 29, 1990
Applicant:
Inventors:
Rudolf Thurn, Kemnath, DE;
Hans-Joachim Burger, Kummersbruck, DE;
Assignee:
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
310326 ; 310334 ; 310335 ; 310345 ;
Abstract
In an ultrasonic sandwich transducer having an astigmatic sonic lobe, a small rectangular piezoceramic plate is operated on the fourth planar vibrational mode. To prevent the creation of secondary lobes that lead to spurious signals, damping elements are applied to the longitudinal ends of the ultrasonic sandwich transducer. These types of ultrasonic sandwich transducers find application, in ultrasonic proximity switches.