GB430025A - Piezoelectric loud speakers - Google Patents
Piezoelectric loud speakersInfo
- 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
Links
- 239000013078 crystal Substances 0.000 abstract 2
- QFLWZFQWSBQYPS-AWRAUJHKSA-N (3S)-3-[[(2S)-2-[[(2S)-2-[5-[(3aS,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoylamino]-3-methylbutanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]-4-[1-bis(4-chlorophenoxy)phosphorylbutylamino]-4-oxobutanoic acid Chemical compound CCCC(NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](Cc1ccc(O)cc1)NC(=O)[C@@H](NC(=O)CCCCC1SC[C@@H]2NC(=O)N[C@H]12)C(C)C)P(=O)(Oc1ccc(Cl)cc1)Oc1ccc(Cl)cc1 QFLWZFQWSBQYPS-AWRAUJHKSA-N 0.000 abstract 1
- 239000011358 absorbing material Substances 0.000 abstract 1
- LJCNRYVRMXRIQR-OLXYHTOASA-L potassium sodium L-tartrate Chemical compound [Na+].[K+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O LJCNRYVRMXRIQR-OLXYHTOASA-L 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 235000011006 sodium potassium tartrate Nutrition 0.000 abstract 1
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.
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)
| 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)
| 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 |
| US4882562A (en) * | 1986-03-11 | 1989-11-21 | Turbosound Limited | Adaptor for coupling plural compression drivers to a common horn |
| GB2187914B (en) * | 1986-03-11 | 1989-11-15 | Turbosound Group Ltd | Adaptor for coupling plural compression drivers |
| 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 |
-
1933
- 1933-06-14 US US675834A patent/US2102668A/en not_active Expired - Lifetime
- 1933-12-12 GB GB34945/33A patent/GB430025A/en not_active Expired
Cited By (4)
| 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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