Global Patent Index - EP 1039975 A1

EP 1039975 A1 2000-10-04 - PIEZOELECTRIC TRANSDUCER WITH A TEMPERATURE-SENSITIVE COMPONENT

Title (en)

PIEZOELECTRIC TRANSDUCER WITH A TEMPERATURE-SENSITIVE COMPONENT

Title (de)

PIEZOELEKTRISCHER SCHWINGER MIT TEMPERATURABHÄNGIGEM BAUELEMENT

Title (fr)

TRANSDUCTEUR PIEZOELECTRIQUE A COMPOSANT SENSIBLE A LA TEMPERATURE

Publication

EP 1039975 A1 (DE)

Application

EP 98962248 A

Priority

  • DE 9803300 W
  • DE 19756534 A
  • DE 19820208 A

Abstract (en)

[origin: WO9932236A1] The invention relates to a piezoelectric transducer of the type used for ultrasound propagation, for example in acoustic flow rate measuring devices or level detecting devices. The inventive piezoelectric transducer preferably consists of a piezoelectric ceramic (1) which has a first electrode (2) on a first surface and a second electrode (6) on a second surface opposite the first. An electrode-free edge area (3) on which a temperature-sensitive component (9) is mounted is provided on the first surface of the piezoelectric ceramic. Said component is conductively connected to at least one of the electrodes (2, 6). The inventive piezoelectric transducer enables temperature to be measured directly at the acoustic measuring point without any additional cabling.

IPC 1-7 (main, further and additional classification)

B06B 1/06; G01K 7/16

IPC 8 full level (invention and additional information)

B06B 1/06 (2006.01); G01F 1/66 (2006.01); G01F 23/296 (2006.01); H03H 9/17 (2006.01)

CPC (invention and additional information)

H03H 9/176 (2013.01); B06B 1/0651 (2013.01); G01F 1/662 (2013.01); G01F 23/2968 (2013.01)

Citation (search report)

See references of WO 9932236A1

Designated contracting state (EPC)

AT BE CH DE DK FI FR GB LI NL SE

EPO simple patent family

WO 9932236 A1 19990701; EP 1039975 A1 20001004

INPADOC legal status


2004-10-27 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20040421

2003-11-19 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DERANGEWAND

2002-02-20 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020108

2000-10-04 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000505

2000-10-04 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH DE DK FI FR GB LI NL SE