HK71893A - Loudspeaker - Google Patents

Loudspeaker

Info

Publication number
HK71893A
HK71893A HK718/93A HK71893A HK71893A HK 71893 A HK71893 A HK 71893A HK 718/93 A HK718/93 A HK 718/93A HK 71893 A HK71893 A HK 71893A HK 71893 A HK71893 A HK 71893A
Authority
HK
Hong Kong
Prior art keywords
low frequency
unit
high frequency
frequency unit
drive
Prior art date
Application number
HK718/93A
Inventor
Lawrence Reginald Fincham
Original Assignee
Kef Audio Uk 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=HK71893(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kef Audio Uk Ltd filed Critical Kef Audio Uk Ltd
Publication of HK71893A publication Critical patent/HK71893A/en

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.
HK718/93A 1988-05-09 1993-07-22 Loudspeaker HK71893A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
HK71893A true HK71893A (en) 1993-07-30

Family

ID=10636585

Family Applications (1)

Application Number Title Priority Date Filing Date
HK718/93A HK71893A (en) 1988-05-09 1993-07-22 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)

Families Citing this family (22)

* 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
GB2471884A (en) 2009-07-17 2011-01-19 Gp Acoustics Loudspeaker driver surround with at least one stiffening tab
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

Family Cites Families (8)

* 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
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.
US4492826A (en) * 1982-08-10 1985-01-08 R&C Chiu International, Inc. Loudspeaker
JPS59164390U (en) * 1983-04-15 1984-11-05 株式会社　双信音響製作所 Coaxial composite speaker
GB8402229D0 (en) * 1984-01-27 1984-02-29 Tannoy Ltd Moving coil loudspeaker
MX161230A (en) * 1985-12-23 1990-08-24 Unique Mobility Inc IMPROVEMENTS IN LIGHTWEIGHT ELECTROMAGNETIC TRANSDUCER

Also Published As

Publication number Publication date
GB2236929B (en) 1992-11-04
GB2236929A (en) 1991-04-17
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

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Legal Events

Date Code Title Description
PF Patent in force
PE Patent expired

Effective date: 20090504