GB2418559A - Dynamic loudspeaker - Google Patents
Dynamic loudspeaker Download PDFInfo
- Publication number
- GB2418559A GB2418559A GB0421498A GB0421498A GB2418559A GB 2418559 A GB2418559 A GB 2418559A GB 0421498 A GB0421498 A GB 0421498A GB 0421498 A GB0421498 A GB 0421498A GB 2418559 A GB2418559 A GB 2418559A
- Authority
- GB
- United Kingdom
- Prior art keywords
- loudspeaker
- motor
- diaphragm
- linking member
- dynamic
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
- H04R9/063—Loudspeakers using a plurality of acoustic drivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
- H04R2209/026—Transducers having separately controllable opposing diaphragms, e.g. for ring-tone and voice
-
- 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
- H04R7/24—Tensioning by means acting directly on free portions of diaphragm or cone
-
- 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
- H04R7/26—Damping by means acting directly on free portion of diaphragm or cone
Abstract
A dynamic loudspeaker comprises two spaced apart motor units 7,8 each incorporating a centre pole 12 operating in opposite phase resulting in cancellation of 3<rd> order non-linearities, and the two motors 7,8 being linked together by a member 6 connecting both centre poles 12 of each motor unit 7,8. The interconnecting member 6 may be formed of brass, copper or any other heat conducting material, and it may be used to coney heat between the two motors 7, 8. The diaphragm may be a clamshell construction formed from carbon fibre elements 13, 17.
Description
24 1 8559
Title of the Invention
Dynamic Loudspeaker
Field of the Invention
This invention relates to a dynamic loudspeaker system.
Background of the Invention
The dynamic drive unit used by all dynamic loudspeaker systems is fabricated from a single motor with an external basket structure that obstructs the active component. Such a dynamic driver also suffers from structural problems relating to an open structure typically a cone used as the moving part that compresses and lo rarities the air to generate sound. Compared to the invention the conventional dynamic driver sees performance drawbacks in terms of physical size, moving mass and numerous other performance criteria. Furthermore, with a view to eliminating resonance, the tendency is to offer loudspeakers with extremely stiff enclosures.
Summary of the Invention
According to the present invention there is provided a dynamic loudspeaker comprising: (i) two spaced apart motor units each incorporating a centre pole operating in opposite phase resulting in cancellation of 3rd order non- linearities; and (ii) the two motor units being linked together by a member connecting both centre poles of each motor unit, whereby the connected motor units act as the main structural component of the loudspeaker.
Advantages of the Invention The invention not only provides a two motor unit loudspeaker but also eliminates the presence of structure that ordinarily would obstruct the conventional diaphragm(s), and provides improved thermal dynamic properties, reduced size compared with power output, and improved audio performance, as the invention eliminates the conventional use of a second surround, thus reducing the levels of distortion attributable to this component by half, and eliminates the need for a conventional external basket structure and hence eliminates any distortions relating to this obstructing structural component.
Furthermore, the invention enables lower frequencies to be generated with a given volume of air than single driver or multiple driver conventional Isobaric solutions, as the assembly of the composite two motor unit dynamic drive eliminates the need for any obstructing assemblies on both sides of the dynamic part of the lo system typical the diaphragm structure.
Finally, the effect of the connected motor units as the main structural component results in the enclosure not being subjected to vibrations, and hence enclosure stiffening of prior art loudspeakers to counter this effect is eliminated.
Preferred or Optional Features The linking member is metallic.
The linking member is solid.
The linking member is cylindrical.
The linking member is brass, copper or other heat conducting material whereby, in use, heat is conveyed by the linking member from the higher so temperature motor to the lower temperature motor.
A diaphragm is provided having a high degree of stiffness compared with conventional diaphragms, whether conical or not, resulting in a super stiff diaphragm with attendant advantages resulting in near pistonic operation compared with conventional open cone designs, as the super stiff dynamic composite membrane structure defeats the passage of energy from within the enclosure escaping out to the listener The diaphragm is a carbon fibre composite.
The super stiff diaphragm is a closed structure as opposed to an open structure like a cone.
The diaphragm is positioned and aligned by one single surround at the largest diameter of the structure and two spider type supporting structures attached to each motor unit. The circular enclosure system provides the locating structure for the diaphragm surround locating system.
lo A clamshell composite driver is provided for generating accurate, low distortion, high level sound energy from a much smaller enclosure than would be possible with a single dynamic driver or with a two driver system mounted to create Isobaric loading The attachment of the motor units (first to second) is via an internal linking Is structure attached to the centre pole of the (second) motor unit.
A single voice coil former or similar structure is used to mount both voice coils which effectively links both motor coils together and provides a central internal structural member to the dynamic part that will guarantee maximum thermal similarities between both motor units and at the same time conduct away unwanted heat to the metal adjacent internal metal structure.
Drawings A dynamic loudspeaker in accordance with the invention is shown diagrammatically, by way of example only, in the accompanying drawing, which illustrates basically a two motor, basketless, composite loudspeaker driver system.
The loudspeaker illustrated comprises a first motor unit 8 and a second motor unit 7 each having a centre pole 12, which centre poles are linked together by a metallic, heat conducting tube 6 Each motor unit 8,7 includes an Nd.Fe.B motor 11.
The motor unit 8 is mounted in an end wall 14 of a composite enclosure structure 5 which includes sidewalls 15. A suspension unit in the form of a rubber surround 2 is attached to terminal edges 16 of the sidewalls 15 and to a bonded joint 4 at one edge of a clamshell diaphragm structure comprising sides 13 and 17, with the other edges of the sides 13 and 17 bonded at 18 to opposite ends of the tube 6. Cambric suspension elements 9 extend between the bonds 18 and each motor unit 8,7. A lo single voice coil is indicated at 1, while 3 indicates a back plate of each motor unit 8,7.
Claims (12)
1. A dynamic loudspeaker comprising: (i) two spaced apart motor units each incorporating a centre pole operating in opposite phase resulting in cancellation of 3r order non linearities; and (ii) the two motor units being linked together by a member connecting both centre poles of each motor unit, whereby the connected motor units act as the main structural component of the loudspeaker.
lo
2. A loudspeaker as claimed in Claim 1, wherein the linking member is metallic.
3. A loudspeaker as claimed in Claim 1 or Claim 2, wherein the linking member is solid.
4. A loudspeaker as claimed in any preceding claim, wherein the linking member is cylindrical.
5. A loudspeaker as claimed in any preceding claim, wherein the linking member is brass, copper or other heat conducting material whereby, in use, heat is so conveyed by the linking member from the higher temperature motor to the lower temperature motor.
6. A loudspeaker as claimed in any preceding claim, comprising a diaphragm with a high degree of stiffness compared with conventional diaphragms, whether conical or not, resulting in a super stiff diaphragm.
7. A loudspeaker as claimed In Claim 6, wherein the diaphragm is a carbon fibre composite.
8. A loudspeaker as claimed in Claim 6 or Claim 7, wherein the super stiff diaphragm is a closed structure as opposed to an open structure like a cone.
9. A loudspeaker as claimed in any preceding claim, wherein the diaphragm is positioned and aligned by one single surround at the largest diameter of the lo structure and two spider type supporting structures attached to each motor unit.
10. A loudspeaker as claimed in any preceding claim, wherein a clamshell composite driver is provided for generating accurate, low distortion, high level sound energy from a much smaller enclosure than would be possible with a single dynamic driver or with a two driver system mounted to create Isobaric loading.
11. A loudspeaker as claimed in any preceding claim, wherein the attachment of so the motor units (first to second) is via an internal linking structure attached to the centre pole of the (second) motor unit.
12. A loudspeaker as claimed in any preceding claim, wherein a single voice coil former or similar structure is used to mount both voice coils which effectively links both motor coils together and provides a central internal structural member to the dynamic part that will guarantee maximum thermal s,milarities between both motor units and at the same time conduct away unwanted heat to the metal adjacent internal metal structure s 13 A dynamic loudspeaker substantially as herein before described with reference to the accompanying drawings
12. A loudspeaker as claimed in any preceding claim, wherein a single voice coil former or similar structure is used to mount both voice coils which effectively links both motor coils together and provides a central internal structural member to the dynamic part that will guarantee maximum thermal similarities between both motor units and at the same time conduct away unwanted heat to the metal adjacent internal metal structure.
13. A dynamic loudspeaker substantially as herein before described with reference to the accompanying drawings.
Amendments to the claims have been filed as follows
1. A dynamic loudspeaker comprising: (i) two spaced apart motor units each incorporating a centre pole operating in opposite phase resulting in cancellation of 3rd order non linearities; and (ii) the two motor units being linked together by a member connecting both centre poles of each motor unit, whereby the connected motor units act as the main structural component of the loudspeaker; (iii) one motor unit being mounted in an end wall of a composite enclosure lo structure.
it; 2. A loudspeaker as claimed in Claim 1, wherein the linking member is metallic. -e . e
.. 3. A loudspeaker as claimed in Claim 1 or Claim 2, wherein the linking member :.
iS solid.
e. e e e .- 4. A loudspeaker as claimed in any preceding claim, wherein the linking member is cylindrical.
ho 5. A loudspeaker as claimed in any preceding claim, wherein the linking member is brass, copper or other heat conducting material whereby, in use, heat is conveyed by the linking member from the higher temperature motor to the lower temperature motor.
6. A loudspeaker as claimed in any preceding claim, comprising a diaphragm with a high degree of stiffness compared with conventional diaphragms, whether conical or not, resulting in a super stiff diaphragm. A. I he Ace ' .
7 A loudspeaker as claimed In Claim 6, wherein the diaphragm Is a carbon fibre composite.
8 A loudspeaker as claimed in Clam 6 or Claim 7, wherein the super stiff diaphragm is a closed structure as opposed to an open structure like a cone.
9 A loudspeaker as claimed In any preceding claim, wherein the diaphragm is positioned and aligned by one single surround at the largest diameter of the lo structure and two spider type supporting structures attached to each motor unit A loudspeaker as claimed in any preceding claim, wherein a clamshell composite driver is provided for generating accurate, low distortion, high level sound energy from a much smaller enclosure than would be possible with a single dynamic driver or with a two driver system mounted to create Isobaric loading.
11 A loudspeaker as claimed in any preceding claim, wherein the attachment of go the motor units (first to second) is via an internal linking structure attached to the centre pole of the (second) motor unit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0421498A GB2418559B (en) | 2004-09-28 | 2004-09-28 | Dynamic loudspeaker |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0421498A GB2418559B (en) | 2004-09-28 | 2004-09-28 | Dynamic loudspeaker |
Publications (3)
Publication Number | Publication Date |
---|---|
GB0421498D0 GB0421498D0 (en) | 2004-10-27 |
GB2418559A true GB2418559A (en) | 2006-03-29 |
GB2418559B GB2418559B (en) | 2007-12-19 |
Family
ID=33397354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0421498A Expired - Fee Related GB2418559B (en) | 2004-09-28 | 2004-09-28 | Dynamic loudspeaker |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2418559B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014045483A (en) * | 2012-08-24 | 2014-03-13 | Yih Jenq Cheng | Loudspeaker driver with dual electromagnetism assembly |
JP2015056770A (en) * | 2013-09-11 | 2015-03-23 | イー ジェン チェン | Loudspeaker driver with dual electromagnet assemblies |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1102175A (en) * | 1954-04-01 | 1955-10-18 | Loudspeaker with two opposing motors | |
US3201529A (en) * | 1962-11-16 | 1965-08-17 | Philip C Surh | Dynamic speaker |
GB1286687A (en) * | 1968-12-19 | 1972-08-23 | Josef Wihelm Manger | Electro-dynamic transducers |
JPS5531385A (en) * | 1978-08-28 | 1980-03-05 | Mitsutachi Ogasawara | Ripple loudspeaker |
US5119431A (en) * | 1987-12-28 | 1992-06-02 | Hamby William H | Efficiency loudspeaker |
-
2004
- 2004-09-28 GB GB0421498A patent/GB2418559B/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1102175A (en) * | 1954-04-01 | 1955-10-18 | Loudspeaker with two opposing motors | |
US3201529A (en) * | 1962-11-16 | 1965-08-17 | Philip C Surh | Dynamic speaker |
GB1286687A (en) * | 1968-12-19 | 1972-08-23 | Josef Wihelm Manger | Electro-dynamic transducers |
JPS5531385A (en) * | 1978-08-28 | 1980-03-05 | Mitsutachi Ogasawara | Ripple loudspeaker |
US5119431A (en) * | 1987-12-28 | 1992-06-02 | Hamby William H | Efficiency loudspeaker |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014045483A (en) * | 2012-08-24 | 2014-03-13 | Yih Jenq Cheng | Loudspeaker driver with dual electromagnetism assembly |
EP2701401A3 (en) * | 2012-08-24 | 2015-08-26 | Cheng Yih Jenq | Loudspeaker driver with dual electromagnet assemblies |
US9191746B2 (en) | 2012-08-24 | 2015-11-17 | Cheng Yih Jenq | Loudspeaker driver with dual electromagnet assemblies |
JP2015056770A (en) * | 2013-09-11 | 2015-03-23 | イー ジェン チェン | Loudspeaker driver with dual electromagnet assemblies |
Also Published As
Publication number | Publication date |
---|---|
GB2418559B (en) | 2007-12-19 |
GB0421498D0 (en) | 2004-10-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20130928 |