[go: up one dir, main page]

GB1239658A - - Google Patents

Info

Publication number
GB1239658A
GB1239658A GB1239658DA GB1239658A GB 1239658 A GB1239658 A GB 1239658A GB 1239658D A GB1239658D A GB 1239658DA GB 1239658 A GB1239658 A GB 1239658A
Authority
GB
United Kingdom
Prior art keywords
plates
diaphragm
holes
coated
april
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Publication of GB1239658A publication Critical patent/GB1239658A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/02—Loudspeakers

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

1,239,658. Electrostatic loudspeakers. BOWERS & WILKINS ELECTRONICS Ltd. 16 April, 1970 [17 April, 1969], No. 19607/69. Heading H4J. An electrostatic loudspeaker element includes two perforated spaced apart plates 11, 12 of rigid insulating material each including a conductive surface 29, 16 on the side facing away from the other plate which surface is perforated with holes of larger diameter 21 than the holes in the respective plates and a diaphragm 15 of flexible insulating material coated with electrically resistive material secured between said plates. Plates 11, 12 are made either by a printed circuit technique or from a sheet of copper coated epoxy glass laminated. The conductive areas are produced by an etching process and the holes produced by drilling and counterboring or countersinking. The finished plates are encapsulated or varnished at 23 which produces a slight flaring at each hole leading to improved acoustic properties. The diaphragm 15 consists of polyvinyl or polyvinylidene chloride 0À0004 inch thick and is coated with resistive material on both sides to give a resistivity of 1 x 10<SP>7</SP> to 5 x 10<SP>8</SP> ohms/square inch. It is secured to an outer frame and shrunk before cementing to rear spacer member 13 when the outer frame is removed. After assembly the diaphragm is gripped between spacer members 13, 14 around each loudspeaker element and is electrically connected through contact 24. The array of loudspeaker elements may be curved to improve its directional characteristics.
GB1239658D 1969-04-17 1969-04-17 Expired GB1239658A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1960769 1969-04-17

Publications (1)

Publication Number Publication Date
GB1239658A true GB1239658A (en) 1971-07-21

Family

ID=10132176

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1239658D Expired GB1239658A (en) 1969-04-17 1969-04-17

Country Status (4)

Country Link
BE (1) BE749037A (en)
FR (1) FR2039244B1 (en)
GB (1) GB1239658A (en)
IE (1) IE33785B1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006317A (en) * 1975-02-14 1977-02-01 Freeman Miller L Electrostatic transducer and acoustic and electric signal integrator
US4289936A (en) * 1980-04-07 1981-09-15 Civitello John P Electrostatic transducers
US4429189A (en) 1981-11-20 1984-01-31 Bell Telephone Laboratories, Incorporated Electret transducer with a selectively metalized backplate
US4429190A (en) 1981-11-20 1984-01-31 Bell Telephone Laboratories, Incorporated Continuous strip electret transducer array
WO1984004865A1 (en) * 1983-05-23 1984-12-06 Harold Norman Beveridge Electrode for electrostatic transducer and methods of manufacture
WO2014176657A1 (en) * 2013-05-01 2014-11-06 Murray Ronald Harman Electrostatic loudspeaker, tools and methods for making same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2423945A1 (en) * 1978-03-31 1979-11-16 Guisto Marc Electrostatic transducer having membranes of metallised plastics film - for durable ultrasonic or transmission equipment
NL193083C (en) * 1994-06-08 1998-09-08 Cornelis Ruijtenberg Method for manufacturing a transducer from an electrostatic loudspeaker.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008013A (en) * 1954-07-20 1961-11-07 Ferranti Ltd Electrostatic loudspeakers
US2975243A (en) * 1958-01-17 1961-03-14 Philco Corp Transducers

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006317A (en) * 1975-02-14 1977-02-01 Freeman Miller L Electrostatic transducer and acoustic and electric signal integrator
US4289936A (en) * 1980-04-07 1981-09-15 Civitello John P Electrostatic transducers
US4429189A (en) 1981-11-20 1984-01-31 Bell Telephone Laboratories, Incorporated Electret transducer with a selectively metalized backplate
US4429190A (en) 1981-11-20 1984-01-31 Bell Telephone Laboratories, Incorporated Continuous strip electret transducer array
WO1984004865A1 (en) * 1983-05-23 1984-12-06 Harold Norman Beveridge Electrode for electrostatic transducer and methods of manufacture
US4533794A (en) * 1983-05-23 1985-08-06 Beveridge Harold N Electrode for electrostatic transducer
EP0147432A4 (en) * 1983-05-23 1986-06-05 Harold Norman Beveridge Electrode for electrostatic transducer and methods of manufacture.
WO2014176657A1 (en) * 2013-05-01 2014-11-06 Murray Ronald Harman Electrostatic loudspeaker, tools and methods for making same

Also Published As

Publication number Publication date
BE749037A (en) 1970-10-01
IE33785L (en) 1970-10-17
FR2039244A1 (en) 1971-01-15
FR2039244B1 (en) 1974-05-24
IE33785B1 (en) 1974-10-30

Similar Documents

Publication Publication Date Title
EP0107843B1 (en) Acceleration vibration detector
EP0549200B1 (en) Electret transducer array
US5430805A (en) Planar electromagnetic transducer
US4233477A (en) Flexible, shapeable, composite acoustic transducer
GB2122842A (en) An electroacoustic transducer and a method of manufacturing an electroacoustic transducer
US5789844A (en) Acoustic transducer
US3832499A (en) Electro-acoustic transducer
TW344903B (en) Wafer fabricated electroacoustic transducer
GB1239658A (en)
EP0147432A4 (en) Electrode for electrostatic transducer and methods of manufacture.
US4626729A (en) Electroacoustic piezoelectric transducers
JPS6055799A (en) Electret microphone
US2416887A (en) Piezoelectric device
US2797399A (en) Underwater transducer
CN112714388A (en) Directional microphones and electronics
CN216336594U (en) Sound production device
CN204795586U (en) Twin crystal piezoceramics piece, piezoceramics speaker, cell -phone, panel computer
CN206226720U (en) A kind of pair of backplane MEMS sound-producing device and electronic equipment
CN104796829B (en) Bimorph piezo electric potsherd and its application
JP2001186596A (en) Condenser microphone
CN210981597U (en) Double-induction pressure sensor
CN209676466U (en) Diaphragm with suspension and microspeaker using same
JPS58207798A (en) Transducer
JPS5976199U (en) condenser microphone
JPS5830395Y2 (en) piezoelectric polymer transducer

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee