GB409040A - Improvements in or relating to piezo electric microphones or speakers - Google Patents
Improvements in or relating to piezo electric microphones or speakersInfo
- Publication number
- GB409040A GB409040A GB3075832A GB3075832A GB409040A GB 409040 A GB409040 A GB 409040A GB 3075832 A GB3075832 A GB 3075832A GB 3075832 A GB3075832 A GB 3075832A GB 409040 A GB409040 A GB 409040A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cemented
- piezo
- plates
- plate
- bodies
- 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
- 238000010276 construction Methods 0.000 abstract 4
- 239000011888 foil Substances 0.000 abstract 4
- 239000013078 crystal Substances 0.000 abstract 2
- 239000004568 cement Substances 0.000 abstract 1
- 238000013016 damping Methods 0.000 abstract 1
- 229920001971 elastomer Polymers 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 235000019271 petrolatum Nutrition 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
- 230000005855 radiation Effects 0.000 abstract 1
- 230000000717 retained effect Effects 0.000 abstract 1
- 229920006395 saturated elastomer Polymers 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)
- Transducers For Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
409,040. Loud-speakers; microphones. STEVENS, A. H., 5, Quality Court, Chancery Lane, London.-(Brush Development Co. ; Cleveland, Ohio, U.S.A.) Nov. 1, 1932, No. 30758. [Class 40 (iv).] A piezo-electric apparatus, more particularly a loud-speaker or a microphone, comprises a plate-like piezo-electric body adapted by flexing to convert electrical impulses into mechanical impulses and vice versa and having a flexible surface capable of direct radiation into orabsorption from a fluid of acoustic vibrations substantially non-selectively over a frequency range of upwards of one octave. Fig. 2 shows a construction of microphone, which may also be used as a loud-speaker, comprising a support 1 recessed on one side to provide a shoulder 3 against which the edge of the piezo-electric disc 2 is cemented at 4. The space behind the disc is filled with oil or petroleum jelly saturated felt 4<a> for damping purposes and a small aperture 1<a> extends through the web portion of the support so as to equalize the pressure on the two sides of the crystal diaphragm under changing barometric conditions. The disc 2 is composed of twelve pairs of sector-shaped plates 5, 5<1>, the plates of each pair being cut as shown from a plate 11, Fig. 4, previously cut as shown from the Rochelle salt crystal, Fig. 3, the electrical axis and transverse and longitidunal crystalline axes being shown at a-a, b-b and c-c respectively. One of the plates 5, 51 is then turned over and superposed and cemented to the other plate and, after the twelve pairs have been assembled, metal foil sheets 6, 7 are cemented to the opposite faces of the disc. According to a modified construction, two crystalline plates 11, Fig. 4, are employed, each plate having sector-shaped foils A, B, C, D cemented to its outer and inner faces as shown in Fig. 6, the two foiled plates being in turn cemented together with the bottom of one plate arranged adjacent the top of the other. The resultant structure is then turned down to the circular form shown in Fig. 6 and the sector-shaped foils connected in series, parallel or series-parallel. Fig. 11 shows a further modified form of piezo-electric body 22 consisting of a pair of rectangular plates 14, 15 each cut from a plate 11 as shown at 14<1> in Fig. 4 and having foil electrodes 16, 17 and 18, 19 cemented to their opposite faces, the two foiled plates being then cemented together. Two such bodies 22 may be mounted as shown in Fig. 14 in parallel spaced relation in a frame 23 of insulating-material, the bodies being held against rubber covered lugs 23<a> in the frame by thin paper sheets 24 cemented to the faces of the bodies and to the top and bottom faces of the frame. Fig. 15 shows a construction employing a plurality of such bodies 26 mounted with spacing blocks 27 on rods 29 on a base 28 and enclosed by a foraminous case 30, the four upper bodies being connected in parallel with each other and the four lower bodies being similarly connected while the two groups are connected in series. According to a further construction, Fig. 17, a piezo-electric body 32, constructed similarly to that shown in Fig. 11, is retained on shoulders 33<a> in a shielding case 33 by strips 34 secured to the case by screws 35, the back of the body being damped by felt 36 whilst according to a still further modification, Fig. 19, a single piezo-electric plate 37 has its end edges secured by cement 39 in a case 38. If desired, the piezo-electric body may be associated with a horn and diaphragm chamber.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3075832A GB409040A (en) | 1932-11-01 | 1932-11-01 | Improvements in or relating to piezo electric microphones or speakers |
DEB159462D DE680487C (en) | 1932-11-01 | 1933-02-02 | Piezoelectric sound device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3075832A GB409040A (en) | 1932-11-01 | 1932-11-01 | Improvements in or relating to piezo electric microphones or speakers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB409040A true GB409040A (en) | 1934-04-26 |
Family
ID=10312671
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3075832A Expired GB409040A (en) | 1932-11-01 | 1932-11-01 | Improvements in or relating to piezo electric microphones or speakers |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE680487C (en) |
GB (1) | GB409040A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3268855A (en) * | 1963-03-19 | 1966-08-23 | Electro Voice | Ultrasonic microphone |
DE3415088C1 (en) * | 1984-04-21 | 1985-09-12 | Eugen Beyer, Elektrotechnische Fabrik GmbH & Co, 7100 Heilbronn | Capacitor microphone |
WO1988003739A1 (en) * | 1986-11-07 | 1988-05-19 | Plessey Australia Pty. Limited | A composite sonar transducer for operation as a low frequency underwater acoustic source |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE946820C (en) * | 1940-04-20 | 1956-08-09 | Aeg | Electromechanical, in particular electroacoustic, conversion device made of piezoelectric elements |
-
1932
- 1932-11-01 GB GB3075832A patent/GB409040A/en not_active Expired
-
1933
- 1933-02-02 DE DEB159462D patent/DE680487C/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3268855A (en) * | 1963-03-19 | 1966-08-23 | Electro Voice | Ultrasonic microphone |
DE3415088C1 (en) * | 1984-04-21 | 1985-09-12 | Eugen Beyer, Elektrotechnische Fabrik GmbH & Co, 7100 Heilbronn | Capacitor microphone |
WO1988003739A1 (en) * | 1986-11-07 | 1988-05-19 | Plessey Australia Pty. Limited | A composite sonar transducer for operation as a low frequency underwater acoustic source |
US4878207A (en) * | 1986-11-07 | 1989-10-31 | Plessey Australia Pty. Ltd. | Composite sonar transducer for operation as a low frequency underwater acoustic source |
Also Published As
Publication number | Publication date |
---|---|
DE680487C (en) | 1939-08-30 |
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