GB1312508A - Capacitive transducers - Google Patents
Capacitive transducersInfo
- Publication number
- GB1312508A GB1312508A GB2807270A GB2807270A GB1312508A GB 1312508 A GB1312508 A GB 1312508A GB 2807270 A GB2807270 A GB 2807270A GB 2807270 A GB2807270 A GB 2807270A GB 1312508 A GB1312508 A GB 1312508A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- plate
- backplate
- june
- insulating layer
- 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
Classifications
-
- 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
- H04R19/005—Electrostatic transducers using semiconductor materials
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
1312508 Capacitor transducers MARCONI CO Ltd 10 June 1970 [23 June 1969] 28072/70 Heading H4J A capacitor transducer comprises a backplate 1 (Fig. 1) forming one electrode, a movable second electrode 3 and an insulating layer 4 between electrode 3 and the electrode of backplate 1. The electrode 3 is supported by a flexible non-metallic foil 2 on the side of the electrode 3 remote from the back-plate 1. Electrode 3 may be a film of evaporated aluminium. The back-plate 1 preferably presents a rough metal surface. The electrode of the back-plate 1 as shown in Fig. 1 is in the form of a plateau defined by an encircling groove. The insulating layer 4 is on the back-plate 1 or on the electrode 3. It is preferably formed by oxidation of the metal and may constitute an electret. It preferably contacts the other electrode. Foil 2 may be of polyethylene terephthalate. The electrode 3 may be provided only in the central area of the structure. The back-plate 1 (Fig. 3) may be recessed and at least the surface is metallic. The non-metallic foil 2 may contact the electrode 3 over the whole surface of electrode 3 or only at the periphery and this peripheral region may be provided with holes to increase flexibility.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU5681169 | 1969-06-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1312508A true GB1312508A (en) | 1973-04-04 |
Family
ID=3742327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2807270A Expired GB1312508A (en) | 1969-06-23 | 1970-06-10 | Capacitive transducers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1312508A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1985002748A1 (en) * | 1983-12-05 | 1985-06-20 | Polaroid Corporation | High energy ultrasonic transducer |
| GB2155731A (en) * | 1983-11-01 | 1985-09-25 | John David Gregson | Ultrasonic transducers |
| EP1292171A3 (en) * | 2001-09-05 | 2008-10-29 | Nippon Hoso Kyokai | Chip microphone and method of making same |
-
1970
- 1970-06-10 GB GB2807270A patent/GB1312508A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2155731A (en) * | 1983-11-01 | 1985-09-25 | John David Gregson | Ultrasonic transducers |
| WO1985002748A1 (en) * | 1983-12-05 | 1985-06-20 | Polaroid Corporation | High energy ultrasonic transducer |
| EP1292171A3 (en) * | 2001-09-05 | 2008-10-29 | Nippon Hoso Kyokai | Chip microphone and method of making same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |