GB2236929A - Loudspeaker - Google Patents

Loudspeaker

Info

Publication number
GB2236929A
GB2236929A GB9023490A GB9023490A GB2236929A GB 2236929 A GB2236929 A GB 2236929A GB 9023490 A GB9023490 A GB 9023490A GB 9023490 A GB9023490 A GB 9023490A GB 2236929 A GB2236929 A GB 2236929A
Authority
GB
United Kingdom
Prior art keywords
low frequency
unit
high frequency
frequency unit
drive
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
GB9023490A
Other versions
GB2236929B (en
GB9023490D0 (en
Inventor
Lawrence Reginald Fincham
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.)
KEF Electronics Ltd
Original Assignee
KEF Electronics Ltd
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10636585&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=GB2236929(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by KEF Electronics Ltd filed Critical KEF Electronics Ltd
Publication of GB9023490D0 publication Critical patent/GB9023490D0/en
Publication of GB2236929A publication Critical patent/GB2236929A/en
Application granted granted Critical
Publication of GB2236929B publication Critical patent/GB2236929B/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • 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
    • H04R9/025—Magnetic circuit

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Liquid Crystal (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

A compound loudspeaker drive unit is disclosed comprising a low frequency unit having an outwardly and forwardly flaring conical diaphragm (21) and a high frequency drive unit (27) located in or adjacent to the neck of the low frequency conical diaphragm such that the acoustic centres of the two units are substantially coincident and, for a cross-over frequency range in which both drive units contribute significant sound output, the directivity of sound radiation from the high frequency unit (27) as acoustically loaded by the low frequency conical diaphragm (21) is substantially the same as that of the low frequency unit. A magnet structure (28,29,30) for the high frequency unit utilises a magnet (29) formed of neodymium iron boron which enables the high frequency unit (27) to be positioned within a drive coil (23,24) for the low frequency diaphragm while providing a required high value of magnetic flux.
GB9023490A 1988-05-09 1990-10-29 Loudspeaker Expired - Lifetime GB2236929B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888810943A GB8810943D0 (en) 1988-05-09 1988-05-09 Loudspeaker
PCT/GB1989/000476 WO1989011201A1 (en) 1988-05-09 1989-05-05 Loudspeaker

Publications (3)

Publication Number Publication Date
GB9023490D0 GB9023490D0 (en) 1991-01-09
GB2236929A true GB2236929A (en) 1991-04-17
GB2236929B GB2236929B (en) 1992-11-04

Family

ID=10636585

Family Applications (2)

Application Number Title Priority Date Filing Date
GB888810943A Pending GB8810943D0 (en) 1988-05-09 1988-05-09 Loudspeaker
GB9023490A Expired - Lifetime GB2236929B (en) 1988-05-09 1990-10-29 Loudspeaker

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB888810943A Pending GB8810943D0 (en) 1988-05-09 1988-05-09 Loudspeaker

Country Status (12)

Country Link
EP (1) EP0341926B2 (en)
JP (1) JP2766862B2 (en)
KR (1) KR0171567B1 (en)
AT (1) ATE115352T1 (en)
AU (1) AU3558189A (en)
CA (1) CA1339519C (en)
DE (1) DE68919746T3 (en)
ES (1) ES2065988T3 (en)
GB (2) GB8810943D0 (en)
HK (1) HK71893A (en)
NZ (1) NZ229054A (en)
WO (1) WO1989011201A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011007151A2 (en) 2009-07-17 2011-01-20 Gp Acoustics (Uk) Limited Improvements in or relating to surrounds for audio drivers

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0574387A1 (en) * 1990-10-09 1993-12-22 Stage Ac-Company B.V. Electrodynamic loudspeaker with cooling arrangement
WO1992007449A1 (en) * 1990-10-17 1992-04-30 Canon Research Centre Europe Ltd Sound output device
IT1258008B (en) * 1992-01-14 1996-02-20 COMPOUND ELECTROACOUSTIC TRANSDUCER FOR THE REPRODUCTION OF MEDIUM-HIGH FREQUENCIES
DE4225156A1 (en) * 1992-07-30 1994-02-03 Nokia Deutschland Gmbh Magnet system for electro-acoustic transducers
DE4234069A1 (en) * 1992-10-09 1994-04-14 Nokia Deutschland Gmbh Cone speaker in lightweight design
DE29512102U1 (en) * 1995-07-27 1995-10-05 Nokia (Deutschland) Gmbh, 75175 Pforzheim Magnet system
GB2359213B (en) * 1999-10-29 2004-05-19 Kef Audio High frequency transducer
CA2352732A1 (en) * 2000-07-11 2002-01-11 Philip Jeffrey Anthony Compound loudspeaker drive unit having a magnet system
GB2364847B (en) * 2000-07-11 2004-10-13 Kef Audio Compound loudspeaker having a magnet system
GB2368484B (en) * 2000-10-25 2004-06-16 B & W Loudspeakers Distributed mode panel type loudspeakers
CN1311712C (en) * 2000-12-26 2007-04-18 安德斯·萨格伦 Concentric co-planar multiband electro-acoustic converter
ITVI20030041A1 (en) * 2003-03-03 2004-09-04 Alessandro Riccobono COLUMN SOUND DIFFUSER.
AU2008352372B2 (en) * 2008-03-05 2013-12-19 Genelec Oy Nested compound loudspeaker drive unit
DE102008049560B3 (en) * 2008-09-30 2010-07-01 Kuhnke Automotive Gmbh & Co. Kg Electrical oscillating exciter has circular coil arrangement which is engaged into circular gap of magnet arrangement such that coil arrangement and magnet arrangement are movable relative to each other in axial direction
RU2012106653A (en) * 2009-07-24 2013-08-27 Конинклейке Филипс Электроникс Н.В. AUDIO PLAYBACK SYSTEM
GB2474853B (en) 2009-10-27 2014-01-01 Gp Acoustics Uk Ltd Loudspeakers
FR2955446B1 (en) * 2010-01-15 2015-06-05 Phl Audio ELECTRODYNAMIC TRANSDUCER WITH DOME AND FLOATING SUSPENSION
FR2955444B1 (en) * 2010-01-15 2012-08-03 Phl Audio COAXIAL SPEAKER SYSTEM WITH COMPRESSION CHAMBER
FR2955445B1 (en) * 2010-01-15 2013-06-07 Phl Audio ELECTRODYNAMIC TRANSDUCER WITH DOME AND INTERNAL SUSPENSION
FR2955447B1 (en) * 2010-01-15 2012-08-03 Phl Audio ELECTRODYNAMIC TRANSDUCER COMPRISING ACOUSTIC WAVE GUIDE PROVIDING THERMAL DISSIPATION
CN110830891B (en) * 2018-08-07 2021-05-07 深圳市宝业恒实业股份有限公司 High-power frequency-division-self full-frequency loudspeaker

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB665815A (en) * 1945-01-02 1952-01-30 Marconi Wireless Telegraph Co Improvements in sound reproducing devices
FR1001734A (en) * 1946-08-13 1952-02-27 Subalpine Apparecchiature Elet Wide band loudspeaker with dual vibrating system
US4492826A (en) * 1982-08-10 1985-01-08 R&C Chiu International, Inc. Loudspeaker
GB2153628A (en) * 1984-01-27 1985-08-21 Tannoy Ltd Moving coil loudspeaker

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5353543A (en) * 1976-10-27 1978-05-16 Nippon Kokan Kk Welding process for tubes
DE2833202A1 (en) * 1978-07-27 1980-02-14 Schering Ag Aryloxy-alkylsulphonyl-amino-indane derivs. - useful as herbicides, analgesics, antiphlogistics, antipyretics, diuretics, etc.
JPS59164390U (en) * 1983-04-15 1984-11-05 株式会社　双信音響製作所 Coaxial composite speaker
MX161230A (en) * 1985-12-23 1990-08-24 Unique Mobility Inc IMPROVEMENTS IN LIGHTWEIGHT ELECTROMAGNETIC TRANSDUCER

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB665815A (en) * 1945-01-02 1952-01-30 Marconi Wireless Telegraph Co Improvements in sound reproducing devices
FR1001734A (en) * 1946-08-13 1952-02-27 Subalpine Apparecchiature Elet Wide band loudspeaker with dual vibrating system
US4492826A (en) * 1982-08-10 1985-01-08 R&C Chiu International, Inc. Loudspeaker
GB2153628A (en) * 1984-01-27 1985-08-21 Tannoy Ltd Moving coil loudspeaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011007151A2 (en) 2009-07-17 2011-01-20 Gp Acoustics (Uk) Limited Improvements in or relating to surrounds for audio drivers
US9271082B2 (en) 2009-07-17 2016-02-23 Gp Acoustics (Uk) Limited Surrounds for audio drivers

Also Published As

Publication number Publication date
GB2236929B (en) 1992-11-04
KR0171567B1 (en) 1999-03-30
EP0341926A1 (en) 1989-11-15
GB8810943D0 (en) 1988-06-15
DE68919746D1 (en) 1995-01-19
EP0341926B2 (en) 2001-02-07
AU3558189A (en) 1989-11-29
NZ229054A (en) 1992-03-26
KR900702744A (en) 1990-12-08
ATE115352T1 (en) 1994-12-15
JP2766862B2 (en) 1998-06-18
ES2065988T3 (en) 1995-03-01
DE68919746T3 (en) 2001-06-13
GB9023490D0 (en) 1991-01-09
JPH03504310A (en) 1991-09-19
EP0341926B1 (en) 1994-12-07
CA1339519C (en) 1997-10-28
DE68919746T2 (en) 1995-04-20
WO1989011201A1 (en) 1989-11-16
HK71893A (en) 1993-07-30

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Expiry date: 20090504