US3856995A - Pressure gradient piezoelectric microphone - Google Patents

Pressure gradient piezoelectric microphone Download PDF

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Publication number
US3856995A
US3856995A US00359300A US35930073A US3856995A US 3856995 A US3856995 A US 3856995A US 00359300 A US00359300 A US 00359300A US 35930073 A US35930073 A US 35930073A US 3856995 A US3856995 A US 3856995A
Authority
US
United States
Prior art keywords
disc
pressure gradient
piezoelectric
cylinder
transducer
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 - Lifetime
Application number
US00359300A
Other languages
English (en)
Inventor
W Cragg
S Bradley
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.)
STC PLC
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US3856995A publication Critical patent/US3856995A/en
Assigned to STC PLC reassignment STC PLC ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL STANDARD ELECTRIC CORPORATION, A DE CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/02—Microphones

Definitions

  • FIG. 1 is a sectioned side view of a first construction of a pressure gradient microphone
  • the composite disc 10, 13 together with electrodes II and 12 and lead wires 8a and 8b, constitute the piezoelectric disc transducer element of the microphone.
  • the polarized disc 14 is bonded face to face with the disc 10 so that the adjacent electrodes, one on each disc, are conductively joined.
  • the disc 14 may be bonded to the disc 10 so that the respective polarities are opposite (FIG. 5) in which case two lead wires 8a and 81) for external connection are taken one from each of the two outer electrodes.
  • a pressure gradient microphone comprising:

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
US00359300A 1970-10-22 1973-05-11 Pressure gradient piezoelectric microphone Expired - Lifetime US3856995A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB50130/70A GB1278009A (en) 1970-10-22 1970-10-22 Microphone

Publications (1)

Publication Number Publication Date
US3856995A true US3856995A (en) 1974-12-24

Family

ID=10454774

Family Applications (1)

Application Number Title Priority Date Filing Date
US00359300A Expired - Lifetime US3856995A (en) 1970-10-22 1973-05-11 Pressure gradient piezoelectric microphone

Country Status (6)

Country Link
US (1) US3856995A (fr)
AU (1) AU3470771A (fr)
DE (1) DE2152025A1 (fr)
FR (1) FR2111759B1 (fr)
GB (1) GB1278009A (fr)
IL (1) IL38042A0 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995124A (en) * 1974-09-25 1976-11-30 Saad Zaghloul Mohamed Gabr Noise cancelling microphone
US4020448A (en) * 1973-09-17 1977-04-26 James Patrick Corbett Oscillating crystal transducer systems
US4413198A (en) * 1981-12-30 1983-11-01 Motorola, Inc. Piezoelectric transducer apparatus
US6272360B1 (en) * 1997-07-03 2001-08-07 Pan Communications, Inc. Remotely installed transmitter and a hands-free two-way voice terminal device using same
US20030046554A1 (en) * 2001-08-31 2003-03-06 Leydier Robert A. Voice activated smart card
US20100295419A1 (en) * 2009-05-19 2010-11-25 Yasuhisa Fujii Electric power device, electric power generation method, and production method of electric power device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2536622B1 (fr) * 1982-11-19 1986-03-07 Thomson Csf Hydrophone de vitesse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463762A (en) * 1941-11-14 1949-03-08 Automatic Elect Lab Electroacoustical transducer
US2967957A (en) * 1957-09-17 1961-01-10 Massa Frank Electroacoustic transducer
CA748567A (en) * 1966-12-13 D. Ibbotson Thomas Electro-acoustic transducers
US3662124A (en) * 1967-06-05 1972-05-09 Willco Horgerate Medizinische Directional microphone for hearing aid

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA748567A (en) * 1966-12-13 D. Ibbotson Thomas Electro-acoustic transducers
US2463762A (en) * 1941-11-14 1949-03-08 Automatic Elect Lab Electroacoustical transducer
US2967957A (en) * 1957-09-17 1961-01-10 Massa Frank Electroacoustic transducer
US3662124A (en) * 1967-06-05 1972-05-09 Willco Horgerate Medizinische Directional microphone for hearing aid

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020448A (en) * 1973-09-17 1977-04-26 James Patrick Corbett Oscillating crystal transducer systems
US3995124A (en) * 1974-09-25 1976-11-30 Saad Zaghloul Mohamed Gabr Noise cancelling microphone
US4413198A (en) * 1981-12-30 1983-11-01 Motorola, Inc. Piezoelectric transducer apparatus
US6272360B1 (en) * 1997-07-03 2001-08-07 Pan Communications, Inc. Remotely installed transmitter and a hands-free two-way voice terminal device using same
US20030046554A1 (en) * 2001-08-31 2003-03-06 Leydier Robert A. Voice activated smart card
US8266451B2 (en) * 2001-08-31 2012-09-11 Gemalto Sa Voice activated smart card
US20100295419A1 (en) * 2009-05-19 2010-11-25 Yasuhisa Fujii Electric power device, electric power generation method, and production method of electric power device
US8736146B2 (en) * 2009-05-19 2014-05-27 Empire Technology Development Llc Electric power device, electric power generation method, and production method of electric power device

Also Published As

Publication number Publication date
AU3470771A (en) 1973-05-03
GB1278009A (en) 1972-06-14
FR2111759A1 (fr) 1972-06-09
IL38042A0 (en) 1972-03-28
FR2111759B1 (fr) 1976-12-03
DE2152025A1 (de) 1972-04-27

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Legal Events

Date Code Title Description
AS Assignment

Owner name: STC PLC, 10 MALTRAVERS STREET, LONDON, WC2R 3HA, E

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL STANDARD ELECTRIC CORPORATION, A DE CORP.;REEL/FRAME:004761/0721

Effective date: 19870423

Owner name: STC PLC,ENGLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:INTERNATIONAL STANDARD ELECTRIC CORPORATION, A DE CORP.;REEL/FRAME:004761/0721

Effective date: 19870423