WO2000036875A2 - Haut-parleur - Google Patents

Haut-parleur Download PDF

Info

Publication number
WO2000036875A2
WO2000036875A2 PCT/GB1999/004142 GB9904142W WO0036875A2 WO 2000036875 A2 WO2000036875 A2 WO 2000036875A2 GB 9904142 W GB9904142 W GB 9904142W WO 0036875 A2 WO0036875 A2 WO 0036875A2
Authority
WO
WIPO (PCT)
Prior art keywords
loudspeaker according
portable loudspeaker
region
portable
enclosure
Prior art date
Application number
PCT/GB1999/004142
Other languages
English (en)
Other versions
WO2000036875A3 (fr
Inventor
Mervyn Stanley Curtis
Simon Andrew Longbottom
Justin Lee Mckay
Original Assignee
Wharfedale International Limited
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 Wharfedale International Limited filed Critical Wharfedale International Limited
Priority to EP99962288A priority Critical patent/EP1142447B1/fr
Priority to AU18669/00A priority patent/AU1866900A/en
Priority to AT99962288T priority patent/ATE260017T1/de
Priority to DE69914946T priority patent/DE69914946T2/de
Publication of WO2000036875A2 publication Critical patent/WO2000036875A2/fr
Publication of WO2000036875A3 publication Critical patent/WO2000036875A3/fr
Priority to HK02101508.1A priority patent/HK1040034B/zh

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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • 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
    • 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
    • H04R7/04—Plane diaphragms
    • H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion

Definitions

  • the present invention relates to a loudspeaker, particularly but not exclusively a portable loudspeaker for use with personal CD players (e.g. Sony DISCMAN CD players) , personal mini disc players, and personal stereo cassette players (e.g. Sony WALKMAN tape cassette players) .
  • personal CD players e.g. Sony DISCMAN CD players
  • personal mini disc players e.g. Sony DISCMAN CD players
  • personal stereo cassette players e.g. Sony WALKMAN tape cassette players
  • CD/mini disc/cassette players are defined as personal players.
  • Personal players are primarily intended to produce sound for one listener at a time. For this reason, personal players are supplied with headphones. Nevertheless, portable loudspeakers are available on the market and are intended for occasions when the personal players are used to reproduce sound for more than one person at a time. The portable loudspeakers must be compact and lightweight in order to meet user requirements .
  • an object of the present invention is to provide a portable loudspeaker which is more readily accepted by the user.
  • a portable loudspeaker for use with a personal player as hereinbefore defined, comprising a housing having an outer periphery in the shape of a storage device selected from the group consisting of a CD box, a tape cassette box, and a mini disc box.
  • CDs, mini discs and audio tape cassettes are traditionally sold in standard-sized storage boxes and, as a result, there is a tendency for the users of personal players to accept readily the size of such storage boxes. Indeed, accessories such as carrying cases for personal players are sometimes designed to accommodate the standard- sized storage boxes in addition to the personal player itself. Accordingly, the present applicant has appreciated that a loudspeaker with a housing of substantially the same dimensions as one of the standard-sized storage boxes (be it single or double or otherwise) is likely to be more readily accepted by users of personal players because its size is in keeping with existing apparatus carried by users .
  • the housing may comprise an open- op box enclosure and a lid, with the lid being movable from a first position covering the enclosure opening to a second position upstanding from the enclosure. With the lid in the second position, projecting away from the enclosure opening, the interior of the enclosure becomes accessible, possibly for storing an item.
  • the lid may be connected to the open-box enclosure with a hinge.
  • the sound generating unit of the portable loudspeaker is mounted on or in the lid of the portable loudspeaker.
  • the orientation of the sound- generating element may be altered by moving the position of the lid relative to the open-box enclosure. This may be useful if the sound generating element produces a directional output, or to take advantage of beneficial reflections of sound waves, e.g. from a flat surface such as a table.
  • a further sound-generating unit may also be mounted in or on one side of the open-top box enclosure.
  • the said one side may be movable relative to the other sides of the open-box enclosure.
  • the lid and the said one side may be orientated to face in the same direction, perhaps for stereo sound reproduction, whilst the other sides of the open-box enclosure may project outwards to stabilise the portable loudspeaker.
  • the outer periphery of the portable loudspeaker housing may be in the shape of a double CD, tape cassette or mini disc box, in which the said one side forms the second lid which faces the aforementioned lid when closed.
  • CD box particularly a double CD box
  • dimensions of a CD box are well suited to producing a portable loudspeaker embodying the present invention.
  • the sound-generating unit of the portable loudspeaker may comprise a flat panel acoustic radiator and a transducer positioned to excite bending waves in the acoustic radiator and thereby radiate sound energy by flexural vibrations.
  • the flat panel acoustic radiator may be a distributed mode acoustic radiator as disclosed in International patent application published under number WO97/09842 in the name New Transducers Limited, the whole content of which is incorporated herein by reference. With the distributed mode acoustic radiator, the transducer would be mounted in or on the panel at a preferred location to excite distributed modes of vibration in the panel.
  • the housing may house a battery for energising the sound generating element of the portable loudspeaker.
  • the housing may also house a radio receiver for receiving radio signal broadcasts and subsequently reproducing sound through the portable loudspeaker.
  • the radio receiver may include an aerial which is embedded in the housing.
  • a portable loudspeaker for use with a personal player as hereinbefore defined, comprising a housing comprising an open-top box enclosure and a lid, a sound generator mounted on or in the lid, and means coupled to the sound generator for receiving output signals from a personal player, wherein the lid is movable from a first position covering the open-top box enclosure to a second position upstanding from the open-top box enclosure.
  • the receiving means may include a socket for use in combination with a plug electrically connected to the personal player.
  • the receiving means may comprise: an infra-red receiver for use in combination with an infra-red transmitter coupled to the personal player.
  • the lid may be connected to the open-top box enclosure with a hinge.
  • a further sound generator element may be mounted in or on one side of the open-top box enclosure, perhaps facing the enclosure opening.
  • the said one side may be movable relative to the other sides of the enclosure, perhaps pivotally coupled thereto.
  • the outer periphery of the housing may resemble a standard storage device selected from the group consisting of a CD box, a tape cassette box, and a mini disc box.
  • a loudspeaker comprising an acoustic radiator and a transducer mounted on or in the acoustic radiator to excite bending waves in the acoustic radiator for producing an acoustic output, characterised in that the acoustic radiator comprises a first region and a second region surrounding the first region, the first region being stiffer than the second region and having the transducer mounted on or in it .
  • the first region may be regarded as a "stiff" island surrounded by the second region which may be regarded as a flexible diaphragm.
  • the first region may have a first uniform stiffness
  • the second region may have a second uniform stiffness - the first uniform stiffness being greater than the second.
  • the first and second uniform stiffnesses may be achieved by increasing the thickness of the acoustic radiator across the first region.
  • the first region may be at least 25% thicker than the second region.
  • the transition between the different thicknesses of the first and second regions may be tapered to avoid a sharp step.
  • the amplitude of displacements in the acoustic radiator may be greater (perhaps at least five times greater) at frequencies below 300Hz than those at frequencies above 300Hz.
  • Both the first and second regions may be sufficiently stiff to support the propagation of bending waves across the acoustic radiator, at least at high frequencies.
  • the second region may support a degree of pistonic movement in the loudspeaker, thus enabling sound to be produced both pistonically and vibrationally, especially at low frequencies. This may be significant at frequencies up to about 300Hz, where the pistonic contribution to the sound output may provide an important supplement to the vibrational component, especially in compact portable loudspeakers of the present invention.
  • the portable loudspeakers of either the first or second aspects of the present invention may include as the sound-generating unit a loudspeaker according to the third aspect of the present invention and any specific embodiments .
  • Figure 1 shows schematically a first embodiment of a portable loudspeaker embodying the present invention
  • Figure 2 shows schematically a second embodiment of a portable loudspeaker embodying the present invention
  • Figure 3 shows schematically a third embodiment of a portable loudspeaker embodying the present invention
  • Figure 4 shows lid detail of the portable loudspeaker of Figure 3 ;
  • Figure 5 shows a partial cross-sectional view along line XX of Figure 4.
  • Figure 6a and 6b shows laservibrometry results illustrating acoustic behaviour at 250 Hz of the portable loudspeaker of Figure 3.
  • Figure 1 shows a portable loudspeaker (10) resembling a double CD case, and comprising left- and right-hand lids (12,14) pivotally coupled about parallel axes AA and BB to side walling (16) .
  • the side walling (16) forms an open box like enclosure, with the left- and right-hand lids (12,14) acting as the top and bottom surfaces to complete the enclosure.
  • the portable loudspeaker (10) is illustrated in the "open” configuration to facilitate a description of the internal components; in the "closed” configuration (not shown) , the portable loudspeaker (10) is the same shape and size as a conventional double CD case, and thus has the outward appearance thereof.
  • the side walling (16) acts as a support stand for the portable loudspeaker (10) .
  • Rubber feet may be provided on the bottom surface of side walling (16) to improve grip on smooth surfaces .
  • Each lid (12,14) comprises a sound generating unit in the form of a distributed mode acoustic radiator (20) mounted in a frame (22) with a compliant foam surround (not shown) sandwiched therebetween to isolate the frame (22) from unwanted vibrations.
  • the acoustic radiator (20) comprises a stiff, lightweight panel (24) and an exciter (26) , positioned to excite distributed mode bending waves in the panel (24) .
  • the acoustic radiator (20) works in accordance with the teachings of the disclosure of WO97/09842, the whole contents of which are incorporated herein by reference, and accordingly further explanation is unnecessary.
  • the exciter (26) in the left-hand lid (12) is offset relative to the one in the right-hand lid (14) to avoid fouling when the portable loudspeaker (10) is in the closed configuration.
  • the side walling (16) acts as a spacer between the left- and right-hand lids (12,14), providing storage space for certain components.
  • An amplifier (30) including a volume control (32) is mounted towards one corner of the side walling (16) .
  • the amplifier (30) is coupled to input connector (34) for receiving an output setting from a personal player such as a personal cassette player (36) .
  • the input connector (34) could be replaced with a receiver for receiving infra-red output signals from a transmitter coupled to the personal player.
  • the amplifier (30) sends electrical signals to the exciters (26) via wiring (not shown) in order to generate sound.
  • a battery (40) supplying power for the amplifier (30) is located in the corner of the side walling (16) opposite the amplifier (30) ; by locating the amplifier (30) and battery (40) in opposing corners, space is left available to accommodate the exciters (26) when the loudspeaker (10) is in the closed configuration.
  • a 12 volt d.c. input socket may be provided so that power may be introduced from a mains supply (via a transformer) as an alternative to the battery (40) .
  • the amplifier (30) has incorporated with it a radio receiver (38) for receiving radio wave broadcasts to enable radio broadcasts to be heard using the portable loudspeaker (10) .
  • the radio receiver (38) has an aerial (39) embedded in side walling (16) .
  • An MP3 or mini-disc player may also be incorporated in the assembly, perhaps alongside the amplifier.
  • FIG. 2 shows a portable loudspeaker (50) resembling a single CD case, and comprising a lid (52) pivotally coupled about axis A'A 1 to open-top box enclosure (54) .
  • Open-top box enclosure (54) consists of sides (56) with an acoustic radiator (24, 26) coupled thereto.
  • the portable loudspeaker (50) is illustrated in the "open" configuration to show the internal components.
  • FIG. 1 A slimline battery arrangement (58) is illustrated, and the amplifier omitted for convenience.
  • a miniature digital amplifier could be used in place of the somewhat larger analogue amplifier illustrated in Figure 1.
  • a key difference between the Figure 1 and 2 embodiments is the fact that there is no independent side walling so that the lid (52) is hinged direct to the sides (56) defining with a base the open-top box enclosure (54) .
  • the acoustic radiator (24, 26) in the open-top box enclosure (56) is optional and if only one acoustic radiator is required in the portable loudspeaker (50), a standard panel (60) would be used as the base of the enclosure.
  • a stereo signal could still be reproduced by using a pair of such loudspeakers.
  • FIG. 3 shows a portable loudspeaker (70) resembling a double CD case.
  • Each lid (12,14) comprises a sound- generating unit comprising an acoustic radiator (72) which comprises a two-region panel (74) and an exciter (76), positioned to excite bending waves in the acoustic radiator for producing sound.
  • Each acoustic radiator is integrally formed with the respective lid, being moulded from polycarbonate. Thus, there is no compliant foam isolating the acoustic radiator from the rest of the lid.
  • FIG. 4 and 5 shows detail of lid (14) - including the position (78) for the corresponding transducer (equivalent to that of lid (12) when rotated through 180°) .
  • the position (78) may not be the optimised position for locating the transducer.
  • the two-region panel (74) comprises a first region (80) of thickness t 1; and a second region (82) of thickness t 2 .
  • the second region (82) surrounds the first region (80) which may thus be regarded as an "island".
  • the two-regional panel (74) is such that t ⁇ > t 2 , and in the present case t l t is 2.0mm and t 2 is 1.2mm. This means that the first region (80) is stiffer than the second region (84) .
  • a transducer (76) positioned on site (78) will produce bending waves across the panel (74) .
  • the first region (80) - being relatively stiff and lightweight - is particularly suited to propagating such bending waves.
  • Figures 6a and 6b are based on stills taken from laservibrometry experiments at an operating frequency of 250 Hz and give amplitude plots at two phases, 180° apart.
  • results are shown for the two-region panel (74) of Figure 4 with the amplitude readings taken along a line passing through an exciter.
  • results are plotted for an equivalent uniform (distributed mode) panel made from polycarbonate sheet 2mm thick.
  • the amplitude displacements are greatest for the two-region panel (74) where the transducer/exciter (76) is located; the maximum amplitude is perhaps seven times or more greater than that of conventional panel provided for comparison.
  • the increased, pistonic-type displacements at frequencies below about 300Hz provide an enhanced bass response .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Packaging For Recording Disks (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Telephone Set Structure (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Liquid Crystal (AREA)
  • Surgical Instruments (AREA)

Abstract

L'invention porte sur un haut-parleur portable (10) ressemblant à un étui double de CD et comportant des couvercles gauche et droit (12, 14) montés pivotants autour d'axes parallèles A et B sur des montants latéraux (16) qui forment une enceinte ouverte à l'air cubique dont les couvercles gauche et droit (12, 14) constituent la base et le sommet lorsqu'ils sont rabattus de part et d'autre des montants latéraux (16). Chacun des couvercles comporte un générateur de sons sous la forme d'un radiateur acoustique (20) en mode distribué. Cette forme d'étui double de CD le rend plus acceptable par les utilisateurs des lecteurs portables de CD. Des considérations similaires s'appliquent à des haut-parleurs portables en forme d'étui simple pour CD, de cassette de bande audio, et d'étui pour mini-disque.
PCT/GB1999/004142 1998-12-15 1999-12-14 Haut-parleur WO2000036875A2 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP99962288A EP1142447B1 (fr) 1998-12-15 1999-12-14 Haut-parleur
AU18669/00A AU1866900A (en) 1998-12-15 1999-12-14 Loudspeaker
AT99962288T ATE260017T1 (de) 1998-12-15 1999-12-14 Lautsprecher
DE69914946T DE69914946T2 (de) 1998-12-15 1999-12-14 Lautsprecher
HK02101508.1A HK1040034B (zh) 1998-12-15 2002-02-27 揚聲器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9827537.3 1998-12-15
GBGB9827537.3A GB9827537D0 (en) 1998-12-15 1998-12-15 Loudspeaker

Publications (2)

Publication Number Publication Date
WO2000036875A2 true WO2000036875A2 (fr) 2000-06-22
WO2000036875A3 WO2000036875A3 (fr) 2000-09-14

Family

ID=10844217

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/004142 WO2000036875A2 (fr) 1998-12-15 1999-12-14 Haut-parleur

Country Status (10)

Country Link
EP (1) EP1142447B1 (fr)
JP (1) JP2000184480A (fr)
KR (1) KR20000047385A (fr)
CN (1) CN1148994C (fr)
AT (1) ATE260017T1 (fr)
AU (1) AU1866900A (fr)
DE (1) DE69914946T2 (fr)
GB (1) GB9827537D0 (fr)
HK (1) HK1040034B (fr)
WO (1) WO2000036875A2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1322137A2 (fr) * 2001-11-06 2003-06-25 Hosiden Besson Limited Système de haut-paleur portable et applications du même
EP1392080A2 (fr) * 2002-08-17 2004-02-25 KH Technology Corporation Unité et ensemble de haut-parleur
US7245729B2 (en) 2001-04-05 2007-07-17 New Transducers Limited Loudspeaker
GB2463924A (en) * 2008-06-26 2010-04-07 Allan Read Wireless table-top conference system uses Balanced Mode loudspeaker
GB2525767A (en) * 2014-05-01 2015-11-04 Hugh Brogan Speaker device
GB2574591A (en) * 2018-06-07 2019-12-18 Amina Tech Limited Product with integrally formed vibrating panel loudspeaker

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3956306B2 (ja) * 2003-09-26 2007-08-08 ソニー株式会社 スピーカ装置
CN101719586B (zh) * 2009-12-29 2012-12-12 深圳市信维通信股份有限公司 通信设备及其喇叭和天线组件
WO2016085940A1 (fr) * 2014-11-25 2016-06-02 Roebke Kenneth Gustave Amplificateur de guitare portatif

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0412462A2 (fr) * 1989-08-08 1991-02-13 Haberkern, Ottmar Appareil de son et d'image avec un écran plat repliable
WO1997009856A2 (fr) * 1995-09-02 1997-03-13 New Transducers Limited Lecteur de disque compact portatif

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63244936A (ja) * 1987-03-30 1988-10-12 Matsushita Electric Ind Co Ltd 受信装置
JP3494746B2 (ja) * 1995-03-31 2004-02-09 シチズン時計株式会社 液晶表示装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0412462A2 (fr) * 1989-08-08 1991-02-13 Haberkern, Ottmar Appareil de son et d'image avec un écran plat repliable
WO1997009856A2 (fr) * 1995-09-02 1997-03-13 New Transducers Limited Lecteur de disque compact portatif

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 51 (E-712), 6 February 1989 (1989-02-06) & JP 63 244936 A (MATSUSHITA), 12 October 1988 (1988-10-12) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 2, 28 February 1997 (1997-02-28) & JP 08 275088 A (CITIZEN WATCH CO), 18 October 1996 (1996-10-18) *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7245729B2 (en) 2001-04-05 2007-07-17 New Transducers Limited Loudspeaker
EP1322137A2 (fr) * 2001-11-06 2003-06-25 Hosiden Besson Limited Système de haut-paleur portable et applications du même
EP1322137A3 (fr) * 2001-11-06 2008-08-27 Hosiden Besson Limited Système de haut-paleur portable et applications du même
EP1392080A2 (fr) * 2002-08-17 2004-02-25 KH Technology Corporation Unité et ensemble de haut-parleur
EP1392080A3 (fr) * 2002-08-17 2004-12-22 KH Technology Corporation Unité et ensemble de haut-parleur
GB2463924A (en) * 2008-06-26 2010-04-07 Allan Read Wireless table-top conference system uses Balanced Mode loudspeaker
GB2525767A (en) * 2014-05-01 2015-11-04 Hugh Brogan Speaker device
GB2525767B (en) * 2014-05-01 2017-01-11 Brogan Hugh Speaker device
GB2542714A (en) * 2014-05-01 2017-03-29 Brogan Hugh Speaker device
US10264337B2 (en) 2014-05-01 2019-04-16 Hugh Brogan Speaker device
GB2574591A (en) * 2018-06-07 2019-12-18 Amina Tech Limited Product with integrally formed vibrating panel loudspeaker
GB2574591B (en) * 2018-06-07 2020-10-28 Amina Tech Limited Product with integrally formed vibrating panel loudspeaker

Also Published As

Publication number Publication date
JP2000184480A (ja) 2000-06-30
HK1040034A1 (en) 2002-05-17
EP1142447B1 (fr) 2004-02-18
DE69914946D1 (de) 2004-03-25
WO2000036875A3 (fr) 2000-09-14
CN1329808A (zh) 2002-01-02
AU1866900A (en) 2000-07-03
EP1142447A2 (fr) 2001-10-10
DE69914946T2 (de) 2005-01-05
CN1148994C (zh) 2004-05-05
HK1040034B (zh) 2004-09-10
ATE260017T1 (de) 2004-03-15
GB9827537D0 (en) 1999-02-10
KR20000047385A (ko) 2000-07-25

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