Title:
ULTRASONIC SENSOR
Document Type and Number:
Japanese Patent JP3880047
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To inexpensively provide an ultrasonic sensor in which dispersion of an initial characteristic is reduced, which is neither easily affected by a temperature difference, nor deteriorated by an environment.
SOLUTION: A base and a cylindrical part of a case is integrally formed of piezoelectric ceramics. A crossed finger electrode and a spiral electrode are formed on the base. The piezoelectric ceramics between the electrodes are polarized, and set to be driving sources.
Inventors:
Toyama Katsuhito
Application Number:
JP2002210828A
Publication Date:
February 14, 2007
Filing Date:
July 19, 2002
Export Citation:
Assignee:
NEC TOKIN CORPORATION
International Classes:
G01V1/00; H04R17/00; G01S7/521; (IPC1-7): H04R17/00; G01S7/521; G01V1/00
Domestic Patent References:
| JP6133386A | ||||
| JP63131711A |