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
Light source lighting device including a constant-current supply that is connected to a light source and supplies a constant current of a substantially constant magnitude to the light source,
Article based on a composition containing a crosslinked blend of elastomers
Active metal fuel cells
Audio processing in a multi-participant conference
Home appreciation participation notes
Multi-mode 3-dimensional image display apparatus
Method to quantify siRNAs, miRNAs and polymorphic miRNAs
  Randomly Featured Patents
Knob
Method and apparatus for simultaneous output of digital audio and midi synthesized music
Central swivel joint for optimizing ground adaptation of front machinery of farm tractors
Magnetic shielding for reducing magnetic interference
System and a method of fabricating protective masks for vehicles
Instrumentation for properly seating an artificial intervertebral disc in an intervertebral space
Dieffenbachia hybrida Tahiti
Printer
Pillowed flexible cube-corner sheeting and methods of manufacture
Security marking system and method for minimizing pirating of data on data media including compact discs and digital versatile discs