GB2056817A - A loudspeaker membrane - Google Patents
A loudspeaker membrane Download PDFInfo
- Publication number
- GB2056817A GB2056817A GB8028947A GB8028947A GB2056817A GB 2056817 A GB2056817 A GB 2056817A GB 8028947 A GB8028947 A GB 8028947A GB 8028947 A GB8028947 A GB 8028947A GB 2056817 A GB2056817 A GB 2056817A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sound emitting
- component
- emitting component
- border
- rubber
- 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.)
- Granted
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 17
- 229920002994 synthetic fiber Polymers 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000001125 extrusion Methods 0.000 claims description 12
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000002657 fibrous material Substances 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 230000006978 adaptation Effects 0.000 claims description 2
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 230000032683 aging Effects 0.000 claims description 2
- 238000009472 formulation Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 239000001993 wax Substances 0.000 claims description 2
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
-
- 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
- H04R7/16—Mounting or tensioning of diaphragms or cones
- H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
- H04R7/20—Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
Abstract
The sound emitting 1 and border 2 components of a loudspeaker membrane are joined, 3, by extruding the border component material under high pressure directly onto a marginal surface of the sound emitting component. Said material (rubber or a synthetic material) flows around the end portions of the fibrous sound emitting component. <IMAGE>
Description
SPECIFICATION
A loudspeaker membrane
The present invention relates to a loudspeaker membrane.
A loudspeaker membrane may comprise a sound emitting component which consists of fibrous material, preferably cardboard, and an adjoining border component which is provided with a corrugation and which consists of rubber or synthetic material (for example, plastics material) to be clamped in or to the chassis frame of the loudspeaker. In accordance with existing techniques, the two components are joined to one another by gluing, for which purpose it is necessary to roughen the respective surface of the inner peripheral portion of the border component, namely, in the region in which adhesion is required. Then the adhesive is applied with care and, in particular, uniformly.
Apart from the relatively high time outlay required for these manipulative procedures, a particular disadvantage lies in the restrictions on the mixture or formulation prescribed for the material of the border component due to the need for adaptation to or compatibility with the adhesive. Thus, it is not possible to use any materials which are disadvantageous as regards adhesion (such, for example, as waxes and oils) which would decisively improve the resistance to ageing of said border component.
A further disadvantage of the aforementioned prior art manufacturing method consists in the non-uniform application of the adhesive which frequently occurs in practice and which can serve to influence negatively the oscillation (vibrational) qualities or properties of the membranes.
The principal object of the invention is to eliminate the aformentioned disadvantages.
Accordingly, the present invention consists in getting away from the use of adhesives and in producing an intimate and direct connection in the transition zone between the sound emitting component and the border component by extruding the rubber or synthetic material of said border component under high pressure onto the edge or marginal surface of the sound emitting component. The extrusion pressure may fall within the range 400 bar to 600 bar.
The present invention will be briefly explained with reference to the accompanying diagrammatic drawing which illustrates one embodiment of a loudspeaker made in accordance with and itself according to the invention, by way of example.
The loudspeaker membrane illustrated in cross-section consists of a so-called border component 2 and a sound emitting component 1. An intimate joint achieved by a high extrusion pressure applied to the material of the border component 2 is effected in the junction zone 3 between the two components.
Test results have indicated that the joint achieved by the flowing of the rubber of synthetic material, which is in a plastic state at the extrusion stage, between or around those end portions of the fibres of the material of the sound emitting component which project from the surfaces of said component can not only reproduce or simulate but even surpass the prior art adhesive joint in terms of stability. A precisely executed or custom-made tool ensures that the sound emitting component is both held in slip-free fashion and is sealed (except for the predetermined marginal portion thereof) from the mould cavity in which the so-called border component is to be formed, said sealing avoiding an overflow of the rubber or synthetic material.
An advantageous extrusion pressure for the material of the border component in order to achieve the optimum joint thereof with the sound emitting component has been found to be approximately 400 to 600 bar.
1. Loudspeaker membrane comprising a sound emitting component of fibrous material and a conjoined border component which is provided with a corrugation and which consists of rubber or synthetic material, to be clamped in or to the chassis frame of the loudspeaker, wherein an intimate and direct connection exists in the junction zone between said fibrous material of the sound emitting component and the rubber or synthetic material of the border component, said intimate and direct connection having been achieved by the extrusion of the rubber or synthetic material at high pressure into a marginal surface of the sound emitting component.
2. A method of manufacturing a loudspeaker membrane which comprises a sound emitting component and a conjoined border component, the sound emitting component consisting of a fibrous material and the border component consisting of rubber or synthetic material and having a corrugation therein, said method comprising the following steps, namely, holding the sound emitting component in slip-free fashion and in such a manner as to ensure that only a predetermined marginal portion of the sound emitting component is exposed in a mould in which the border component is to be formed, and then extruding said rubber or synthetic material in a plastic condition under high pressure into said mould in order simultaneously to form the border component and to join the border component to the sound emitting component directly without the use of an ashesive.
3. A method as claimed in claim 2, wherein the extrusion pressure falls within the range from 400 bar to 600 bar.
4. Loudspeaker member constructed and
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (6)
1. Loudspeaker membrane comprising a sound emitting component of fibrous material and a conjoined border component which is provided with a corrugation and which consists of rubber or synthetic material, to be clamped in or to the chassis frame of the loudspeaker, wherein an intimate and direct connection exists in the junction zone between said fibrous material of the sound emitting component and the rubber or synthetic material of the border component, said intimate and direct connection having been achieved by the extrusion of the rubber or synthetic material at high pressure into a marginal surface of the sound emitting component.
2. A method of manufacturing a loudspeaker membrane which comprises a sound emitting component and a conjoined border component, the sound emitting component consisting of a fibrous material and the border component consisting of rubber or synthetic material and having a corrugation therein, said method comprising the following steps, namely, holding the sound emitting component in slip-free fashion and in such a manner as to ensure that only a predetermined marginal portion of the sound emitting component is exposed in a mould in which the border component is to be formed, and then extruding said rubber or synthetic material in a plastic condition under high pressure into said mould in order simultaneously to form the border component and to join the border component to the sound emitting component directly without the use of an ashesive.
3. A method as claimed in claim 2, wherein the extrusion pressure falls within the range from 400 bar to 600 bar.
4. Loudspeaker member constructed and arranged substantially as hereinbefore described with reference to and as illustrated in the accompanying diagrammatic drawing.
5. A method of manufacture of a loudspeaker membrane substantially as hereinbefore described with reference to the accompanying drawing.
6. Any features of novelty, taken singly or in combination, of the embodiment of the invention hereinbefore described with reference to the accompanying diagrammatic drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19797925593U DE7925593U1 (en) | 1979-09-10 | 1979-09-10 | SPEAKER MEMBRANE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2056817A true GB2056817A (en) | 1981-03-18 |
| GB2056817B GB2056817B (en) | 1983-11-23 |
Family
ID=6707238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8028947A Expired GB2056817B (en) | 1979-09-10 | 1980-09-08 | Loudspeaker membrane |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE7925593U1 (en) |
| FR (1) | FR2465386A1 (en) |
| GB (1) | GB2056817B (en) |
| IT (1) | IT1209348B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2522912A1 (en) * | 1982-03-03 | 1983-09-09 | Audax | Poly:norbornene support membranes for low density speaker diaphragms - filled and oil extended for optimum mechanical properties |
| US5115474A (en) * | 1988-04-30 | 1992-05-19 | Pioneer Electronic Corporation | Speaker system |
| EP0492914A2 (en) * | 1990-12-20 | 1992-07-01 | Leach, Patrick Arthur | Loudspeaker cone and surround assembly |
| EP0552040A1 (en) * | 1992-01-15 | 1993-07-21 | Patrick Arthur Leach | Method and apparatus for making a loudspeaker cone and surround assembly |
| EP0632674A1 (en) * | 1993-06-28 | 1995-01-04 | Sony Corporation | Diaphragm for use with an electro-acoustic transducer and method of producing the same |
| GB2327902A (en) * | 1997-10-14 | 1999-02-10 | Kurt Mueller | A speaker cone and method of manufacture thereof |
| WO2000007409A1 (en) * | 1998-07-29 | 2000-02-10 | New Transducers Limited | Loudspeaker drive unit having a resonant panel-form member |
-
1979
- 1979-09-10 DE DE19797925593U patent/DE7925593U1/en not_active Expired
-
1980
- 1980-09-08 GB GB8028947A patent/GB2056817B/en not_active Expired
- 1980-09-09 FR FR8019466A patent/FR2465386A1/en active Granted
- 1980-09-09 IT IT8024556A patent/IT1209348B/en active
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2522912A1 (en) * | 1982-03-03 | 1983-09-09 | Audax | Poly:norbornene support membranes for low density speaker diaphragms - filled and oil extended for optimum mechanical properties |
| US5115474A (en) * | 1988-04-30 | 1992-05-19 | Pioneer Electronic Corporation | Speaker system |
| EP0492914A2 (en) * | 1990-12-20 | 1992-07-01 | Leach, Patrick Arthur | Loudspeaker cone and surround assembly |
| EP0492914A3 (en) * | 1990-12-20 | 1992-10-21 | Leach, Patrick Arthur | Loudspeaker cone and surround assembly |
| GB2273678B (en) * | 1992-01-15 | 1995-05-03 | Patrick Arthur Leach | Method and apparatus for making a loudspeaker cone and surround assembly |
| WO1993014608A1 (en) * | 1992-01-15 | 1993-07-22 | Patrick Arthur Leach | Method and apparatus for making a loudspeaker cone and surround assembly |
| GB2273678A (en) * | 1992-01-15 | 1994-06-29 | Patrick Arthur Leach | Method and apparatus for making a loudspeaker cone and surround assembly |
| EP0552040A1 (en) * | 1992-01-15 | 1993-07-21 | Patrick Arthur Leach | Method and apparatus for making a loudspeaker cone and surround assembly |
| US6171534B1 (en) | 1992-01-15 | 2001-01-09 | Patrick Arthur Leach | Method of making a speaker cone and surround assembly |
| EP0632674A1 (en) * | 1993-06-28 | 1995-01-04 | Sony Corporation | Diaphragm for use with an electro-acoustic transducer and method of producing the same |
| US5521886A (en) * | 1993-06-28 | 1996-05-28 | Sony Corporation | Diaphragm for use with an electro-acoustic transducer and method of producing the same |
| GB2327902A (en) * | 1997-10-14 | 1999-02-10 | Kurt Mueller | A speaker cone and method of manufacture thereof |
| GB2328177A (en) * | 1997-10-14 | 1999-02-17 | Kurt Mueller | Injection moulding an elastomeric surround to a speaker cone |
| GB2328177B (en) * | 1997-10-14 | 2000-01-12 | Kurt Mueller | Speaker cone |
| GB2327902B (en) * | 1997-10-14 | 2000-01-12 | Kurt Mueller | Speaker cone |
| WO2000007409A1 (en) * | 1998-07-29 | 2000-02-10 | New Transducers Limited | Loudspeaker drive unit having a resonant panel-form member |
| US6610237B2 (en) | 1998-07-29 | 2003-08-26 | New Transducers Limited | Method of making a loudspeaker drive unit having a resiliently suspended panel-form member |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2056817B (en) | 1983-11-23 |
| FR2465386B3 (en) | 1982-06-18 |
| DE7925593U1 (en) | 1980-02-28 |
| IT1209348B (en) | 1989-07-16 |
| FR2465386A1 (en) | 1981-03-20 |
| IT8024556A0 (en) | 1980-09-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |