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GB2334849A - The double diaphragm loudspeaker - Google Patents

The double diaphragm loudspeaker Download PDF

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Publication number
GB2334849A
GB2334849A GB9804275A GB9804275A GB2334849A GB 2334849 A GB2334849 A GB 2334849A GB 9804275 A GB9804275 A GB 9804275A GB 9804275 A GB9804275 A GB 9804275A GB 2334849 A GB2334849 A GB 2334849A
Authority
GB
United Kingdom
Prior art keywords
coil
moving
diaphragm
diaphragms
double diaphragm
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
Application number
GB9804275A
Other versions
GB2334849B (en
GB9804275D0 (en
Inventor
Simon James Norfolk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB9804275A priority Critical patent/GB2334849B/en
Publication of GB9804275D0 publication Critical patent/GB9804275D0/en
Publication of GB2334849A publication Critical patent/GB2334849A/en
Application granted granted Critical
Publication of GB2334849B publication Critical patent/GB2334849B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

This loudspeaker comprises a single moving coil motor unit 3,4 driving mutually opposed diaphragms 5. Both diaphragms are attached to a single voice coil and so as one diaphragm moves inwards the other moves outwards. Preferably the diaphragms 5, their suspensions 6 and their surrounds 7 should be identical.

Description

THE DOUBLE DIAPHRAGM This invention relates to a new loudspeaker moving coil transducer.
Electromagnatic drivers, at present, consist of sinale cone shaped diaphragm 1 which vibrates due to forces acting on it from alternating current in an inductor and forces acting on it from magnetic flux.
The double diaphragm has a different magnetic circuit and therefore a different motor coil assembly 2.
Suspending a collection of magnets ,which form a cylindrical pole 3 that outwardly radiates a south magnetic field , in between the inductive coil , and then suspending this in a larger hollow cylinder 4 magnet system ,similarly made with a collection of small magnets ,that radiates a North magnetic field inwards, enables another 5 cone shaped diaphragm to be run from the motor coil assembly but in the other direction.
Most problems presented to the loudspeaker builder, using the normal single diaphragm, relates to a means of either using the back sound wave produced in the form of baffles, folded horns and labyrinth vented enclosures, or to a means of controlling spring 6 resonances with closed box or reflex enclosures. The double diaphragm introduces new theory to each of these problems.
The front wave of one diaphragm becomes the back wave of the other diaphragm, and vice-versa.
The double diaphragm gives a higher electro-acoustic energy conversion efficiency.
The double diaphragm is more omnidirectional than the standard single.

Claims (4)

  1. CLAIMS 1.A moving-coil electro-acoustic transducer ,that drives two acoustically radiating diaphragms, which radiate acoustic waves in opposite directions.
  2. 2. The diaphragms ,as claimed in 1, are driven from the same moving-coil.
  3. 3.As one diaphragm ,as claimed in 1, is pushed away from the moving-coil, the other diaphragm is pulled towards the moving-coil , and vica-versa.
  4. 4.The moving-coil , as claimed in 1, is made to move by magnetic force from a combination of any possible magnetic force producing elements or fields.
GB9804275A 1998-02-27 1998-02-27 The double diaphragm Expired - Fee Related GB2334849B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9804275A GB2334849B (en) 1998-02-27 1998-02-27 The double diaphragm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9804275A GB2334849B (en) 1998-02-27 1998-02-27 The double diaphragm

Publications (3)

Publication Number Publication Date
GB9804275D0 GB9804275D0 (en) 1998-04-22
GB2334849A true GB2334849A (en) 1999-09-01
GB2334849B GB2334849B (en) 2001-02-28

Family

ID=10827761

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9804275A Expired - Fee Related GB2334849B (en) 1998-02-27 1998-02-27 The double diaphragm

Country Status (1)

Country Link
GB (1) GB2334849B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB445935A (en) * 1934-10-17 1936-04-17 Alfred Sidney Evans An improved sound reproducing device
US4595801A (en) * 1983-10-27 1986-06-17 Ronald Coffin Coupled dual cone velocity driver speaker
EP0804048A2 (en) * 1996-04-26 1997-10-29 NOKIA TECHNOLOGY GmbH Loudspeaker
US5701358A (en) * 1994-07-05 1997-12-23 Larsen; John T. Isobaric loudspeaker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB445935A (en) * 1934-10-17 1936-04-17 Alfred Sidney Evans An improved sound reproducing device
US4595801A (en) * 1983-10-27 1986-06-17 Ronald Coffin Coupled dual cone velocity driver speaker
US5701358A (en) * 1994-07-05 1997-12-23 Larsen; John T. Isobaric loudspeaker
EP0804048A2 (en) * 1996-04-26 1997-10-29 NOKIA TECHNOLOGY GmbH Loudspeaker

Also Published As

Publication number Publication date
GB2334849B (en) 2001-02-28
GB9804275D0 (en) 1998-04-22

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20020227