GB1565157A - Electret transducers - Google Patents

Electret transducers Download PDF

Info

Publication number
GB1565157A
GB1565157A GB51555/77A GB5155577A GB1565157A GB 1565157 A GB1565157 A GB 1565157A GB 51555/77 A GB51555/77 A GB 51555/77A GB 5155577 A GB5155577 A GB 5155577A GB 1565157 A GB1565157 A GB 1565157A
Authority
GB
United Kingdom
Prior art keywords
fet
case
backplate
electrode
terminal
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
GB51555/77A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Industrial Research Products Inc
Original Assignee
Industrial Research Products Inc
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 by Industrial Research Products Inc filed Critical Industrial Research Products Inc
Publication of GB1565157A publication Critical patent/GB1565157A/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
    • H04R19/01—Electrostatic transducers characterised by the use of electrets
    • H04R19/016—Electrostatic transducers characterised by the use of electrets for microphones
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H03F1/523—Circuit arrangements for protecting such amplifiers for amplifiers using field-effect devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/60—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
    • H04R25/604—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of acoustic or vibrational transducers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
GB51555/77A 1976-12-30 1977-12-12 Electret transducers Expired GB1565157A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/755,468 US4063050A (en) 1976-12-30 1976-12-30 Acoustic transducer with improved electret assembly

Publications (1)

Publication Number Publication Date
GB1565157A true GB1565157A (en) 1980-04-16

Family

ID=25039270

Family Applications (1)

Application Number Title Priority Date Filing Date
GB51555/77A Expired GB1565157A (en) 1976-12-30 1977-12-12 Electret transducers

Country Status (3)

Country Link
US (2) US4063050A (enExample)
DE (1) DE2758666B2 (enExample)
GB (1) GB1565157A (enExample)

Families Citing this family (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE398588B (sv) * 1977-03-23 1977-12-27 Ericsson Telefon Ab L M Temperaturstabil elektretmikrofon
NL7802688A (nl) * 1978-03-13 1979-09-17 Philips Nv Inrichting voor het omzetten van akoestische in elektrische trillingen en omgekeerd, voor- zien van tenminste een kondensator elektreet- element aangesloten op een elektronische schakeling.
DE2942641A1 (de) * 1979-10-22 1981-04-30 Deutsche Itt Industries Gmbh, 7800 Freiburg Telefon-sprechkapsel-innenschaltung als kohlemikrophonersatz
US4316062A (en) * 1979-12-28 1982-02-16 Beveridge Harold N Electrostatic electroacoustic transducer
US4418246A (en) * 1980-10-29 1983-11-29 Tibbetts Industries, Inc. Cell assembly for electret transducer
US4443666A (en) * 1980-11-24 1984-04-17 Gentex Corporation Electret microphone assembly
US4450930A (en) * 1982-09-03 1984-05-29 Industrial Research Products, Inc. Microphone with stepped response
SE452083C (sv) * 1983-02-25 1991-01-14 Rune Rosander Mikrofon
US4509193A (en) * 1983-07-11 1985-04-02 Industrial Research Products, Inc. Miniature acoustical transducer with filter/regulator power supply circuit
DE3418844A1 (de) * 1984-05-21 1985-11-21 Siemens AG, 1000 Berlin und 8000 München Kastenfoermige flachbaugruppe
US4764690A (en) * 1986-06-18 1988-08-16 Lectret S.A. Electret transducing
USRE33718E (en) * 1986-09-15 1991-10-15 Knowles Electronics, Inc. Acoustic transducer with improved electrode spacing
US4730283A (en) * 1986-09-15 1988-03-08 Industrial Research Products, Inc. Acoustic transducer with improved electrode spacing
US4815560A (en) * 1987-12-04 1989-03-28 Industrial Research Products, Inc. Microphone with frequency pre-emphasis
US4864454A (en) * 1988-04-21 1989-09-05 Analog Devices, Incorporated Means for reducing damage to JFETs from electrostatic discharge events
US5021682A (en) * 1989-05-11 1991-06-04 National Semiconductor Corporation Instantaneous power limiting circuit
US5083095A (en) * 1990-08-22 1992-01-21 Knowles Electronics, Inc. Plural source follower amplifier
US5196981A (en) * 1990-12-28 1993-03-23 National Semiconductor Corporation ESD protection scheme
US5097224A (en) * 1991-04-11 1992-03-17 Telex Communications, Inc. Self-biasing, low noise amplifier of extended dynamic range
NL9101563A (nl) * 1991-09-17 1993-04-16 Microtel Bv Elektroacoustische transducent van het elektreet type.
US5408534A (en) * 1992-03-05 1995-04-18 Knowles Electronics, Inc. Electret microphone assembly, and method of manufacturer
US5337011A (en) * 1992-12-14 1994-08-09 Knowles Electronics, Inc. Pre-amplifier
US5446413A (en) * 1994-05-20 1995-08-29 Knowles Electronics, Inc. Impedance circuit for a miniature hearing aid
US5548658A (en) * 1994-06-06 1996-08-20 Knowles Electronics, Inc. Acoustic Transducer
US5589799A (en) * 1994-09-29 1996-12-31 Tibbetts Industries, Inc. Low noise amplifier for microphone
US6023194A (en) * 1997-05-23 2000-02-08 Tibbetts Industries, Inc. Amplifier with reduced input capacitance
US6093144A (en) * 1997-12-16 2000-07-25 Symphonix Devices, Inc. Implantable microphone having improved sensitivity and frequency response
NL1009544C2 (nl) * 1998-07-02 2000-01-10 Microtronic Nederland Bv Stelsel bestaande uit een microfoon en een voorversterker.
US6251219B1 (en) 1998-09-17 2001-06-26 Intermedics Inc. Method and apparatus for use in assembling electronic devices
US6505665B1 (en) 1998-09-17 2003-01-14 Intermedics, Inc. Method and apparatus for use in assembling electronic devices
US6532293B1 (en) 2000-02-08 2003-03-11 Knowles Electronics Llc Acoustical transducer with reduced parasitic capacitance
US7065224B2 (en) 2001-09-28 2006-06-20 Sonionmicrotronic Nederland B.V. Microphone for a hearing aid or listening device with improved internal damping and foreign material protection
US7221766B2 (en) * 2002-04-15 2007-05-22 Knowles Electronics, Llc Microphone input buffer biasing circuit
US7092538B2 (en) * 2002-04-15 2006-08-15 Knowles Electronics, Llc Switched microphone buffer
US7688987B2 (en) * 2002-04-24 2010-03-30 Knowles Electronics, Llc Electret microphone buffer circuit with significantly enhanced power supply rejection
US7072482B2 (en) 2002-09-06 2006-07-04 Sonion Nederland B.V. Microphone with improved sound inlet port
US7184563B2 (en) * 2003-03-04 2007-02-27 Knowles Electronics Llc. Electret condenser microphone
DE602005010129D1 (de) * 2004-01-12 2008-11-20 Sonion As Verstärkerschaltung für kapazitive Umformer
DE102006055147B4 (de) * 2006-11-03 2011-01-27 Infineon Technologies Ag Schallwandlerstruktur und Verfahren zur Herstellung einer Schallwandlerstruktur
DK2166779T3 (da) * 2008-09-18 2019-08-26 Sonion Nederland Bv Apparat til udsendelse af lyd, der omfatter flere lydgivere og en fælles udgangskanal
EP2552128A1 (en) 2011-07-29 2013-01-30 Sonion Nederland B.V. A dual cartridge directional microphone
US20130186699A1 (en) * 2012-01-23 2013-07-25 Sri International High voltage converters for electrostatic applications
US9398389B2 (en) 2013-05-13 2016-07-19 Knowles Electronics, Llc Apparatus for securing components in an electret condenser microphone (ECM)
WO2017011461A1 (en) 2015-07-15 2017-01-19 Knowles Electronics, Llc Hybrid transducer
US9843292B2 (en) 2015-10-14 2017-12-12 Knowles Electronics, Llc Method and apparatus for maintaining DC bias
WO2017083679A1 (en) 2015-11-12 2017-05-18 Knowles Electronics, Llc Method and apparatus to increase audio band microphone sensitivity
KR20210013152A (ko) 2018-05-24 2021-02-03 더 리서치 파운데이션 포 더 스테이트 유니버시티 오브 뉴욕 정전 용량 센서

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2962665A (en) * 1958-02-24 1960-11-29 Taber Instr Corp Transistor amplifier with damage control
US3048659A (en) * 1959-03-30 1962-08-07 Motorola Inc Microphone preamplifier
US3512100A (en) * 1968-07-03 1970-05-12 Intern Research Products Inc Audio frequency amplification circuit
US3927383A (en) * 1972-04-21 1975-12-16 Rca Corp Low noise wide band transducer system

Also Published As

Publication number Publication date
DE2758666C3 (enExample) 1980-09-25
DE2758666B2 (de) 1980-01-24
DE2758666A1 (de) 1978-07-06
US4063050A (en) 1977-12-13
US4151480A (en) 1979-04-24

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19951212