Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Piezoelectric ultrasonic transducer










Image Number 7 for United States Patent #5761156.

The invention relates to a piezoelectric transducer particularly for use in transit time measurements. The object of the invention is to provide a piezoelectric transducer which ensures an in-phase two-dimensional pulse emission which, independent of the selection of a definite excitation frequency, substantially closely follows the electric excitation at a low time deformation of the pulse owing to transient and dying-out operations and which permits to obtain sufficiently high sound levels at low amplitudes of the excitation voltage. These objects are realized according to the invention in that the center of mass of the entire transducer system is remote from a sound emitting and sound receiving, respectively, surface (4) and in that at least one piezoelectric sheet (1) is provided which via one of its narrow sides (21) is connected to at least one rigid, geometrically and variably adaptable cover plate (3) of low mass, compared to the entire transducer and sheet mass, respectively, in such a manner that the entire surface (4) of the cover plate (3), at least in the sound emitting mode, is substantially and completely covered by the surface lines (5) of an emission angle (.alpha.) under which the piezoelectric sheet irradiates said cover plate (3), and only to said surface (4) the function of being a sound emitting and/or a sound receiving area is assigned.








 
 
  Recently Added Patents
Power management systems and designs
Coating composition, and a process for producing the same
Multilevel directory assistance apparatus and method
Image forming apparatus capable of timely starting different image formation mode
Multi-radio coexistence
Selection of system parameters based on non-acoustic sensor information
System and method of supplying an electrical system with direct current
  Randomly Featured Patents
Directional backlight, display apparatus, and stereoscopic display apparatus
Semi-trailer
Flip hinged lid
Radial impeller for a cooling system of a motor vehicle
Mobile antenna including quick-release mounting
Multi-chambered muffler
Process for the preparation of 2,4,6-trimethylphenol
Address input method and apparatus for navigation system
Titanium-aluminum-silicon-oxide molecular sieve compositions
Semiconductor integrated circuit having an improved voltage switching circuit