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GB430025A - Piezoelectric loud speakers - Google Patents

Piezoelectric loud speakers

Info

Publication number
GB430025A
GB430025A GB34945/33A GB3494533A GB430025A GB 430025 A GB430025 A GB 430025A GB 34945/33 A GB34945/33 A GB 34945/33A GB 3494533 A GB3494533 A GB 3494533A GB 430025 A GB430025 A GB 430025A
Authority
GB
United Kingdom
Prior art keywords
loud
boonton
diaphragm
speaker
faces
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
GB34945/33A
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.)
BOONTON RES CORP
Original Assignee
BOONTON RES 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 BOONTON RES CORP filed Critical BOONTON RES CORP
Publication of GB430025A publication Critical patent/GB430025A/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
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

430,025. Loud-speakers. BOONTON RESEARCH CORPORATION, Boonton, New Jersey, U.S.A. Dec. 12, 1933, No. 34945. Convention date, June 14. [Class 40 (iv)] [See also Group XL] Electro - acoustic apparatus, more particularly a loud-speaker, comprises a piezo-electrically active crystal diaphragm 1, Fig. 1, clamped between gaskets 5, 6 across the throat of a horn 2 provided with a bullet-shaped insert 8. The protective cover 10 also houses the transformer 9 within a sealing compound 11 together with sound absorbing material 12. The diaphragm, Fig. 4, comprises four square crystal units secured together along contiguous edges, each unit consisting of a pair of superposed plates cut from Rochelle Salt with their flat faces normal to the electrical axis. The plates are assembled with an electrode between their adjacent faces and electrodes at their outer faces, the four units being connected in parallel as shown. The loud-speaker preferably has a resonant frequency above 7000 cycles and circuit arrangements are described for controlling the frequency response characteristic. Specification 409,040 is disclaimed.
GB34945/33A 1933-06-14 1933-12-12 Piezoelectric loud speakers Expired GB430025A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US675834A US2102668A (en) 1933-06-14 1933-06-14 Piezoelectric loudspeaker

Publications (1)

Publication Number Publication Date
GB430025A true GB430025A (en) 1935-06-12

Family

ID=24712144

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34945/33A Expired GB430025A (en) 1933-06-14 1933-12-12 Piezoelectric loud speakers

Country Status (2)

Country Link
US (1) US2102668A (en)
GB (1) GB430025A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145905A (en) * 1983-08-31 1985-04-03 Kobishi Electric Co Ltd Audible warning device
US4963855A (en) * 1990-02-21 1990-10-16 Kobishi Electric Co., Inc. Ltd. Warning sound generating device
GB2322502A (en) * 1997-02-22 1998-08-26 Fulleon Synchrobell Ltd Piezoelectric sounder

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453521A (en) * 1942-05-30 1948-11-09 Rca Corp Superimposed duplex loud-speaker
US2546313A (en) * 1946-12-26 1951-03-27 Brush Dev Co Testing instrument for acoustic devices
US2544765A (en) * 1948-08-23 1951-03-13 Edison Inc Thomas A Acoustic coupling device
US2575142A (en) * 1949-08-19 1951-11-13 Sorkin Louis Microphone attachment for accordions
US3113287A (en) * 1956-03-29 1963-12-03 Raytheon Co Electroacoustical transducer mounted on boat hull
US3019661A (en) * 1956-04-26 1962-02-06 Gulton Ind Inc Ultrasonic transducer and impedance matching device therefor
US3663841A (en) * 1970-04-22 1972-05-16 Electro Mechanical Design Ltd Ultrasonic transducers
US4310065A (en) * 1979-05-11 1982-01-12 Chromalloy Electronics Corporation Radial horn
US4713799A (en) * 1984-10-15 1987-12-15 Deere & Company Ultrasonic horn with sidelobe suppressing centerpiece
GB2187914B (en) * 1986-03-11 1989-11-15 Turbosound Group Ltd Adaptor for coupling plural compression drivers
US4882562A (en) * 1986-03-11 1989-11-21 Turbosound Limited Adaptor for coupling plural compression drivers to a common horn
US4845776A (en) * 1987-05-11 1989-07-04 Electro Acustica S.A. Piezoelectric transducer and transformer circuit
US5268537A (en) * 1992-06-29 1993-12-07 Exxon Production Research Company Broadband resonant wave downhole seismic source
US6211601B1 (en) * 1998-03-04 2001-04-03 The United States Of America As Represented By The Secretary Of The Navy Multi-tuned acoustic cylindrical projector
US9443506B2 (en) * 2013-10-10 2016-09-13 Theodore W. Denney, III High frequency energy converter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145905A (en) * 1983-08-31 1985-04-03 Kobishi Electric Co Ltd Audible warning device
US4963855A (en) * 1990-02-21 1990-10-16 Kobishi Electric Co., Inc. Ltd. Warning sound generating device
GB2322502A (en) * 1997-02-22 1998-08-26 Fulleon Synchrobell Ltd Piezoelectric sounder
GB2322502B (en) * 1997-02-22 2001-03-07 Fulleon Synchrobell Ltd Piezoelectric sounder

Also Published As

Publication number Publication date
US2102668A (en) 1937-12-21

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