GB966603A - Improvements in or relating to loudspeaker diaphragms and methods for the manufacture thereof - Google Patents
Improvements in or relating to loudspeaker diaphragms and methods for the manufacture thereofInfo
- Publication number
- GB966603A GB966603A GB545561A GB545561A GB966603A GB 966603 A GB966603 A GB 966603A GB 545561 A GB545561 A GB 545561A GB 545561 A GB545561 A GB 545561A GB 966603 A GB966603 A GB 966603A
- Authority
- GB
- United Kingdom
- Prior art keywords
- weight
- parts
- lacquer
- diaphragm
- resin
- 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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
A method of making a loudspeaker diaphragm comprises the steps of impregnating a textile fabric with a stiffening agent forming the fabric to the required shape and then coating it with a thermosetting softening-agent-free lacquer. In one example the lacquer was made by preparing a 35% by weight solution in a mixture of methyl glycol acetate, toluene and ethyl acetate of the following mixture: 7 parts by weight of an ethoxyline resin and 3 parts by weight of an urea formaldehyde resin. In another example the lacquer was made by dissolving 10 parts by weight of polyvinylformal and 4 parts by weight of a cresolformaldehyde novolak in 86 parts by weight of xylene cresol 1:1. Specification 709,397 is referred to.ALSO:In a loudspeaker diaphragm (see Division H4) made of textile material both the sound radiating part and the peripheral supporting edge are impregnated with a thermosetting resin and after the resin has been set, the sound radiating part only is further coated with a synthetic thermosetting lacquer. A textile material, e.g. cotton, nylon, polyester fibre &c., having equal warp and weft is impregnated with a thermosetting resin, e.g. phenol-formaldehyde novolak and hexamethylene tetramine in an ethanol-water mixture. When the fabric is dry it is transferred to a mould where it is heated under pressure for a short time, i.e. 10 seconds, so as to produce for example a non-deformable conical diaphragm. The periphery of this diaphragm may be grooved and may be further impregnated with a plastic substance. In order to make the sound radiating part of the diaphragm impervious to air and resistant to insects, it is coated, by immersing, spraying or brushing with a lacquer and is then heated at about 200 DEG C. for 2-15 minutes. The lacquer should be of the type used for coating wires and examples are given, i.e. ethoxyline and urea formaldehyde resins in a solution of methyl glycol acetate, toluene and ethyl acetate, or by dissolving ten parts by weight of polyvinylformal and four parts by weight of a cresolformaldehyde novolak in 86 parts by weight of xylene cresol 1 : 1. Specification 709,397 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL248534 | 1960-02-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB966603A true GB966603A (en) | 1964-08-12 |
Family
ID=19752186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB545561A Expired GB966603A (en) | 1960-02-17 | 1961-02-14 | Improvements in or relating to loudspeaker diaphragms and methods for the manufacture thereof |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH392627A (en) |
| DE (1) | DE1154516B (en) |
| ES (1) | ES264871A1 (en) |
| GB (1) | GB966603A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8301653A (en) * | 1983-05-10 | 1984-12-03 | Philips Nv | ELECTRO-ACOUSTIC CONVERTER WITH AN AIR-PERMISSIBLE MEMBRANE. |
| GB2538809B (en) * | 2015-05-29 | 2021-08-25 | B & W Group Ltd | Loudspeaker diaphragm |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE691930C (en) * | 1933-08-11 | 1940-06-08 | Telefunken Gmbh | Seamless small diaphragm, dynamically driven on the outer edge, of conical or dome shape for funnel loudspeakers |
| US2302178A (en) * | 1940-11-12 | 1942-11-17 | Joseph B Brennan | Acoustic diaphragm |
| US2408038A (en) * | 1941-12-10 | 1946-09-24 | Joseph B Brennan | Article made of fibrous material |
| DE806861C (en) * | 1948-11-23 | 1951-06-18 | Gottlob Widmann & Soehne K G E | Membrane for loudspeakers and moving coil microphones |
| US2873813A (en) * | 1955-07-27 | 1959-02-17 | Hawley Products Co | Acoustic diaphragm and method of construction |
-
1961
- 1961-02-14 CH CH173961A patent/CH392627A/en unknown
- 1961-02-14 DE DEN19608A patent/DE1154516B/en active Pending
- 1961-02-14 GB GB545561A patent/GB966603A/en not_active Expired
- 1961-02-14 ES ES0264871A patent/ES264871A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1154516B (en) | 1963-09-19 |
| ES264871A1 (en) | 1961-07-16 |
| CH392627A (en) | 1965-05-31 |
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