Global Patent Index - EP 0973149 A3

EP 0973149 A3 2000-12-27 - Ultrasonic transducers

Title (en)

Ultrasonic transducers

Title (de)

Ultraschallwandlern

Title (fr)

Transducteurs ultrasonores

Publication

EP 0973149 A3 (EN)

Application

EP 99305633 A

Priority

  • US 11627198 A
  • US 30020099 A

Abstract (en)

[origin: EP0973149A2] Sonic transducers utilize resonant cavities of varying depths to achieve wide operational bandwidth. The transducers (29) may include a conductive membrane (38) spaced apart from one or more backplate electrodes (32a,32b). In one approach, spacing is achieved using a dielectric spacer (34) having a series of depressions (36) arranged in a pattern, the depressions forming cavities each resonant at a predetermined frequency. In another approach, the conductive membrane (62) is piezoelectrically active, and the transducer is simultaneously driven in both piezoelectric and electrostatic modes. <IMAGE>

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

G10K 9/12; G01H 11/06; B06B 1/02

IPC 8 full level (invention and additional information)

H04R 17/10 (2006.01); B06B 1/02 (2006.01); B06B 1/06 (2006.01); H04R 17/00 (2006.01)

CPC (invention and additional information)

B06B 1/0688 (2013.01); B06B 1/0292 (2013.01); B06B 1/0614 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 0973149 A2 20000119; EP 0973149 A3 20001227; JP 2000050392 A 20000218; JP 4294798 B2 20090715

INPADOC legal status


2003-08-27 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20030205

2002-09-11 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020725

2001-09-12 [AKX] PAYMENT OF DESIGNATION FEES

- Free text: BE DE FR GB NL

2001-08-22 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010626

2000-12-27 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A3

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2000-12-27 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI

2000-12-27 [RIC1] CLASSIFICATION (CORRECTION)

- Free text: 7G 10K 9/12 A, 7G 01H 11/06 B, 7B 06B 1/02 B

2000-02-02 [RIN1] INVENTOR (CORRECTION)

- Inventor name: POMPEI, FRANK JOSEPH

2000-01-19 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): BE DE FR GB NL

2000-01-19 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI