Global Patent Index - EP 1238568 A1

EP 1238568 A1 2002-09-11 - METHOD FOR MAKING A SURFACE MECHANICAL WAVE ABSORBING MATERIAL AND RESULTING ELECTRO-ACOUSTIC TRANSDUCER

Title (en)

METHOD FOR MAKING A SURFACE MECHANICAL WAVE ABSORBING MATERIAL AND RESULTING ELECTRO-ACOUSTIC TRANSDUCER

Title (de)

VERFAHREN ZUR HERSTELLUNG EINES ABSORBIERENDEN MATERIALES VON MECHANISCHEN OBERFLÄCHENWELLEN,ABSORBIERENDES MATERIAL UND ELEKTROAKUSTISCHER WANDLER DARAUS HERGESTELLTER

Title (fr)

PROCEDE DE FABRICATION D'UN MATERIAU ABSORBANT D'ONDES MECANIQUES DE SURFACE, MATERIAU ABSORBANT ET TRANSDUCTEUR ELECTROACOUSTIQUE AINSI OBTENU

Publication

EP 1238568 A1 (FR)

Application

EP 00988951 A

Priority

  • FR 0003578 W
  • FR 9915877 A

Abstract (en)

[origin: WO0145462A1] The invention concerns a method for making a material absorbing surface mechanical wave generated by local waves capable of producing interference phenomena relative to the pressure wave with propagation direction orthogonal to said surface. The method consists in forming a support (S) delimiting the surface from a continuous structure, said support having a specific rigidity in a direction substantially orthogonal to said support (S). An sound-absorbing coat (R) is then formed on at least one surface of the support (S), said coat comprising a plurality of obstacles to the propagation of the surface mechanical wave and the local waves, which are thus absorbed. The invention is useful for making diaphragms for electro-acoustic transducers and high quality electro-acoustic transducers.

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

H04R 7/12

IPC 8 full level (invention and additional information)

H04R 7/12 (2006.01)

CPC (invention and additional information)

H04R 7/122 (2013.01)

Citation (search report)

See references of WO 0145462A1

Designated contracting state (EPC)

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

EPO simple patent family

WO 0145462 A1 20010621; EP 1238568 A1 20020911; FR 2802759 A1 20010622; FR 2802759 B1 20020215; US 2003075382 A1 20030424

INPADOC legal status


2004-01-14 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20030708

2003-02-05 [RTI1] TITLE (CORRECTION)

- Free text: METHOD FOR MAKING A MATERIAL ABSORBING SURFACE MECHANICAL WAVES, MATERIAL ABSORBING SURFACE MECHANICAL WAVES AND ELECTRO-

2002-09-11 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020605

2002-09-11 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

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