GB1410822A - Electroacoustic arrangements - Google Patents
Electroacoustic arrangementsInfo
- Publication number
- GB1410822A GB1410822A GB4592172A GB4592172A GB1410822A GB 1410822 A GB1410822 A GB 1410822A GB 4592172 A GB4592172 A GB 4592172A GB 4592172 A GB4592172 A GB 4592172A GB 1410822 A GB1410822 A GB 1410822A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- sheet
- microphone
- source
- voltage
- 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
- -1 polyethylene Polymers 0.000 abstract 3
- 238000010438 heat treatment Methods 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 2
- 239000004033 plastic Substances 0.000 abstract 2
- 229920003023 plastic Polymers 0.000 abstract 2
- 101100188552 Arabidopsis thaliana OCT3 gene Proteins 0.000 abstract 1
- 239000004677 Nylon Substances 0.000 abstract 1
- 239000004698 Polyethylene Substances 0.000 abstract 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 abstract 1
- 230000005684 electric field Effects 0.000 abstract 1
- 239000003822 epoxy resin Substances 0.000 abstract 1
- 229920001778 nylon Polymers 0.000 abstract 1
- 229920000647 polyepoxide Polymers 0.000 abstract 1
- 229920000573 polyethylene Polymers 0.000 abstract 1
- 229920000139 polyethylene terephthalate Polymers 0.000 abstract 1
- 239000005020 polyethylene terephthalate Substances 0.000 abstract 1
- 229920000642 polymer Polymers 0.000 abstract 1
- 229920002620 polyvinyl fluoride Polymers 0.000 abstract 1
- 239000005033 polyvinylidene chloride Substances 0.000 abstract 1
Classifications
-
- 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
- H01G7/021—Electrets, i.e. having a permanently-polarised dielectric having an organic dielectric
- H01G7/023—Electrets, i.e. having a permanently-polarised dielectric having an organic dielectric of macromolecular compounds
-
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/01—Electrostatic transducers characterised by the use of electrets
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
1410822 Piezoelectric transducers; microphone circuits MARCONI CO Ltd 3 Oct 1973 [5 Oct 1972] 45921/72 Heading H4J A microphone or other electro-acoustic transducer comprises a sheet 1 (Fig. 1) of polymer or plastics material which is permanently polarized and has electrodes 2, 3 on its opposite faces 4, 5. The sheet a preferably of polyvinylidene chloride, polyethylene, polyethylene terephthalate, polyvinyl fluoride, polytrifluorochlorethylene or nylon. Electrode 2 has a conductive arm 6 while electrode 3 has a conductive arm 8 extending in the opposite directions. Wires (13, 14), Fig. 2 (not shown), are secured to the arms 6, 8 by conductive epoxy resin or by mechanical means. Sheet 1 is polarized by heating it, together with the electrodes 2, 6 and arms 3, 8, to 100‹ C. and applying a voltage of 500V (equivalent to an electric field of 150 kV cm<-1> between faces 4, 5 for one hour whilst heating is maintained. The sheet is then cooled to room temperature while maintaining the applied voltage. The sheet 1 is held taut between two clamping discs (10, 11) Fig. 3 (not shown) of plastics material. One disc (10) has a central circular aperture (15) to expose electrode 2 to acoustic waves. It is thought that the transducer relies upon the piezoelectric effect. The microphone 16 (Fig. 4) is connected between ground and the gate electrode 18 of a F.E.T. 19. Drain electrode 20 is grounded while source electrode 22 is connected via resistor 23 (68 K#) to the negative terminal of a voltage source 24. Bias for the gate electrode 18 is derived via a resistor 25 (10<12> Q) from the negative terminal of source 24. The output is taken from terminals 26, 27.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4592172A GB1410822A (en) | 1972-10-05 | 1972-10-05 | Electroacoustic arrangements |
| DE19722261600 DE2261600A1 (en) | 1972-10-05 | 1972-12-15 | SOUND FREQUENCY DETECTOR |
| NL7313654A NL7313654A (en) | 1972-10-05 | 1973-10-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4592172A GB1410822A (en) | 1972-10-05 | 1972-10-05 | Electroacoustic arrangements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1410822A true GB1410822A (en) | 1975-10-22 |
Family
ID=10439108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4592172A Expired GB1410822A (en) | 1972-10-05 | 1972-10-05 | Electroacoustic arrangements |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE2261600A1 (en) |
| GB (1) | GB1410822A (en) |
| NL (1) | NL7313654A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2500635A1 (en) * | 1981-02-25 | 1982-08-27 | United Kingdom Government | IMPROVEMENTS ON UNDERWATER ACOUSTIC DEVICES |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5562494A (en) * | 1978-11-05 | 1980-05-10 | Ngk Spark Plug Co | Pieozoelectric converter for electric string instrument |
| US4280018A (en) * | 1979-05-14 | 1981-07-21 | Strobotronix, Inc. | Integrated piezoelectric sound transducer and preamplifier |
| DE2942641A1 (en) * | 1979-10-22 | 1981-04-30 | Deutsche Itt Industries Gmbh, 7800 Freiburg | Integrated device for insertion into telephone receiver - is substitute carbon microphone and has P-enrichment FET |
| GB2176369B (en) * | 1985-05-09 | 1988-10-05 | Plessey Co Plc | Improvements in and relating to microphones |
-
1972
- 1972-10-05 GB GB4592172A patent/GB1410822A/en not_active Expired
- 1972-12-15 DE DE19722261600 patent/DE2261600A1/en active Pending
-
1973
- 1973-10-04 NL NL7313654A patent/NL7313654A/xx unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2500635A1 (en) * | 1981-02-25 | 1982-08-27 | United Kingdom Government | IMPROVEMENTS ON UNDERWATER ACOUSTIC DEVICES |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7313654A (en) | 1974-04-09 |
| DE2261600A1 (en) | 1974-04-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |