GB776498A - Improvements in or relating to electromechanical transducers - Google Patents

Improvements in or relating to electromechanical transducers

Info

Publication number
GB776498A
GB776498A GB17555/55A GB1755555A GB776498A GB 776498 A GB776498 A GB 776498A GB 17555/55 A GB17555/55 A GB 17555/55A GB 1755555 A GB1755555 A GB 1755555A GB 776498 A GB776498 A GB 776498A
Authority
GB
United Kingdom
Prior art keywords
june
terminals
pressure
discs
diaphragms
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
GB17555/55A
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.)
AT&T Corp
Original Assignee
Western Electric Co 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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB776498A publication Critical patent/GB776498A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
    • B06B1/0611—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements in a pile
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
    • H01G7/02—Electrets, i.e. having a permanently-polarised dielectric
    • H01G7/025—Electrets, i.e. having a permanently-polarised dielectric having an inorganic dielectric
    • H01G7/026—Electrets, i.e. having a permanently-polarised dielectric having an inorganic dielectric with ceramic dielectric
    • 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
    • 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
    • H04R17/005—Piezoelectric transducers; Electrostrictive transducers using a piezoelectric polymer
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/50—Piezoelectric or electrostrictive devices having a stacked or multilayer structure
    • H10N30/503—Piezoelectric or electrostrictive devices having a stacked or multilayer structure having a non-rectangular cross-section in a plane orthogonal to the stacking direction, e.g. polygonal or circular in top view
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/88—Mounts; Supports; Enclosures; Casings
    • H10N30/886—Additional mechanical prestressing means, e.g. springs

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Ceramic Engineering (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

776,498. Pieao-electric instruments. WESTERN ELECTRIC CO., Inc. June 17, 1955 [June 21, 1954], No. 17555/55. Class 40 (4). [Also in Group XL (b)] The transducing efficiency of a polarized ceramic element which includes a principal component of ferroelectric crystalline material characterized by a perovskite lattice structure is increased by applying pressure to the element in a direction normal to the direction of polarization. The pressure may be applied hydraulically to a stack of barium titanate discs 11 mounted between a pair of acoustically-sensitive diaphragms 27, 28 in a fluid-tight steel cylinder 24. A radial pressure of between 5000 and 10,000 lbs./sq. inch is maintained by means of a fluid introduced through the pipe 21. The discs are provided with silver electrodes which are connected alternately to an insulated terminal 22 and to the cylinder 24. To polarize the elements a voltage of about 25 v. per 0.001 inch thickness is applied across terminals 22, 23 as the unit is cooled to room temperature from a temperature just above the Curie point. Acoustic signals applied to the diaphragms 27, 28 produce an electrical output across the terminals 22, 23.
GB17555/55A 1954-06-21 1955-06-17 Improvements in or relating to electromechanical transducers Expired GB776498A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US776498XA 1954-06-21 1954-06-21

Publications (1)

Publication Number Publication Date
GB776498A true GB776498A (en) 1957-06-05

Family

ID=22139280

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17555/55A Expired GB776498A (en) 1954-06-21 1955-06-17 Improvements in or relating to electromechanical transducers

Country Status (3)

Country Link
DE (1) DE1058773B (en)
GB (1) GB776498A (en)
NL (2) NL103781C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2254223A (en) * 1991-03-08 1992-09-30 Bae Sema Ltd Flextensional sonar transducers
US7531947B2 (en) 2004-09-07 2009-05-12 Nippon Soken, Inc. Stacked piezoelectric element and production method thereof

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1051256A (en) * 1962-08-30
DE1291547B (en) * 1965-10-23 1969-03-27 Aerojet General Co Method for preloading ultrasonic transducers
US3396285A (en) * 1966-08-10 1968-08-06 Trustees Of The Ohio State Uni Electromechanical transducer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2254223A (en) * 1991-03-08 1992-09-30 Bae Sema Ltd Flextensional sonar transducers
GB2254223B (en) * 1991-03-08 1994-09-14 Bae Sema Ltd Flextensional sonar transducers
US7531947B2 (en) 2004-09-07 2009-05-12 Nippon Soken, Inc. Stacked piezoelectric element and production method thereof

Also Published As

Publication number Publication date
NL103781C (en)
NL195880A (en)
DE1058773B (en) 1959-06-04

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