WO2000046786A2 - Casque d'ecoute - Google Patents

Casque d'ecoute Download PDF

Info

Publication number
WO2000046786A2
WO2000046786A2 PCT/GB2000/000331 GB0000331W WO0046786A2 WO 2000046786 A2 WO2000046786 A2 WO 2000046786A2 GB 0000331 W GB0000331 W GB 0000331W WO 0046786 A2 WO0046786 A2 WO 0046786A2
Authority
WO
WIPO (PCT)
Prior art keywords
panel
headphones
ear
acoustic
headphones according
Prior art date
Application number
PCT/GB2000/000331
Other languages
English (en)
Other versions
WO2000046786A3 (fr
Inventor
Henry Azima
Martin Colloms
Denis Morecroft
Original Assignee
New Transducers 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 New Transducers Limited filed Critical New Transducers Limited
Priority to AU24462/00A priority Critical patent/AU2446200A/en
Priority to JP2000597787A priority patent/JP2002536899A/ja
Priority to EP00902717A priority patent/EP1147680A2/fr
Publication of WO2000046786A2 publication Critical patent/WO2000046786A2/fr
Publication of WO2000046786A3 publication Critical patent/WO2000046786A3/fr

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
    • H04R7/045—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication

Definitions

  • the invention relates to headphones. More particularly the invention relates to headphones comprising bending wave panel -form loudspeakers e.g. distributed mode acoustic radiators of the general kind described in International patent application O97/09842.
  • Conventional headphones employ coherent generally pistonic sound sources. These have significant proximity effects and generally show highly critical placement of the transducer with respect to the entrance of the ear canal . It is difficult to predict and control the actual frequency response on the ear.
  • Known planar headphone designs of the ribbon and electrostatic types tend to be cumbersome and costly.
  • headphones comprising a sound source m the form of a resonant panel, and transducer means for launching bending waves into the panel to produce an acoustic output.
  • the sound source may be m the form of a distributed mode 5 acoustic radiator.
  • the headphones comprise a pair of distributed mode acoustic radiators.
  • the or each distributed mode acoustic radiator may comprise a rigid lightweight panel having a cellular core sandwiched between opposed skins.
  • the transducer means for launching bending waves into the radiator may be m the form of an electrodynamic inertial device.
  • a thin panel designed to give good distributed mode operation over a wide frequency range is employed, mounted on a resilient suspension which together with the defined lowest bending mode facilitates a near field, audible frequency range of typically 30Hz to
  • the distributed mode acoustic panel may be made of a card based reinforced construction driven by a suitable mechanically matched low cost piezo transducer. Similar construction materials may be used for the headband allowing for an ultra lightweight build.
  • the invention is diagrammatically illustrated, by way of example, in the accompanying drawings in which: -
  • Figure 1 is a perspective view of a headphones device
  • Figure 2 is a cross-section through part of the headphones device of Figure 1 ;
  • Figure 3 is a cross-section, similar to that of Figure 2, through an alternative embodiment of headphones device;
  • Figure 4 is a cross-section, similar to that of Figure 2, through another embodiment of headphones device;
  • Figure 5 is a cross-section, similar to that of Figure 2, through another embodiment of headphones device;
  • Figure 6 is a cross-section, similar to that of Figure 2, through yet another embodiment of headphones device;
  • Figure 7 is a plan view of another embodiment of headphones device.
  • Figure 8 is a diagram showing possible locations for vibration exciters on a bending wave panel, and
  • Figure 9 is a graph of the measured frequency response of a preferred headphones device.
  • a headphones device (hereinafter “headphones") (1) comprise a generally inverted U-shaped resilient padded member (2) which forms a headband with ear speakers (3) supported on the free ends of the limbs of the headband, in a generally conventional arrangement.
  • lead wires (4) connect the ear speakers to the output of an audio amplifier, not shown.
  • each ear speaker comprises a resonant acoustic radiator comprising a stiff lightweight panel diaphragm (5) and a vibration exciter (6) fixed to the diaphragm for launching bending waves into the diaphragm to cause the panel to resonate to provide an acoustic output.
  • International application O97/09842 describes our preferred distributed mode resonant bending wave acoustic radiators .
  • each earphone of the pair may be a freely supported resonating panel of physical parameters chosen for modal frequency interleaving with a suitably small exciter located to drive the panel at a predetermined off centre location to couple satisfactorily to the modal distribution.
  • the usual headband serves to locate the headphone assembly on the head and a cable is also present to supply audio signals to each channel exciter, generally a two channel signal, e.g. for stereo.
  • each channel exciter generally a two channel signal, e.g. for stereo.
  • the panel is typically 50mm by 70mm or 50mm by 56mm but may be smaller or larger according to the design constraints, such as price, size, quality and bandwidth and the panel is located more or less centrally on the ear.
  • the panel (5) is supported m a casing or housing (7), e.g. of moulded plastic by means of a resilient peripheral suspension (8) to define a cavity (9) which is filled with acoustic damping material (10) .
  • the casing is formed with a bulge or extension (11) to accommodate the exciter (6) .
  • the panel (5) may optimally be covered by an acoustically transparent cover or grill. To improve user comfort, a cushion (12) may surround the panel (5) .
  • the casing or housing (7) is shown as closed-backed, but optionally may be open-backed. In Figure 3, there is shown an embodiment of ear speaker 3 m which the housing or casing (7) of the embodiment of Figures 1 and 2 is replaced by our open frame
  • each ear speaker (3) comprises a housing cr casing (17) for supporting a resonant panel (5) and exciter (6) which is generally similar to that of Figure 2 but which is extended on its inner side (15) to enclose the panel (5) and to define an outlet (16) intended to be aligned with the user's ear canal.
  • the headphones of Figure 5 comprises an ear speaker (3) having a housing (27) carrying a frame (14) supporting a panel (5) on a resilient suspension (8) with vibration exciter mounted on the panel to drive bending waves into the panel to produce an acoustic output, much as described above.
  • the housing (27) forms a duct (18) with the outer face of the panel (5) which terminates m an outlet (19) venting to ambient atmosphere.
  • the duct has the purpose of loading the panel with the acoustic output from the whole outer face of the panel (5) so that the acoustic output from the inner face of the panel to the user's ear is enhanced.
  • the ear speaker (3) has a housing (37) which is relatively large and which is intended for sealing to the user's ear by means of a cushion (12) to form a closed system.
  • pairs of ear speakers (3) e.g. of the kinds described above are mounted on each end of the headband (2) via support member (20) which is adjustable m attitude relative to the headband.
  • Each ear speaker (3) m the pair is mounted on hinge member (21) which m turn is mounted on the member (20) so that the earpieces may be adjusted m disposition and attitude relative to the user's ear to optimise perceived sound quality.
  • the ear speakers can be slid along the support members (20) to vary the attitude of the ear speakers.
  • the members (21) are slidable on the member (20 ) .
  • Figure 8 is a diagram showing possible locations for a vibration exciter (6) on a panel (5) , generally as taught m WO97/09842. Near centre locations as indicated by A are the most efficient, but a near edge position indicated at C and as taught in W099/37121 show good perceived sound quality.
  • the panel may be excited such that predominately bending waves traverse the panel with little or no out of plane contribution, passing smoothly by the ear canal, and thus providing an equivalent to the desired velocity drive for the sound field at the ear.
  • the sound field is largely diffuse in nature, due to the complex, near random modal resonances present over the area of the panel, the acoustic coupling of the panel to the ear largely avoids the usual cavity and boundary resonance effects which result from the placement of a conventional coherent pistonic type of speaker element used m headphones.
  • Coherent source driven standing wave modes cannot develop m the region between the headphone and the ear of the new type compared with conventional technology.
  • Many panel materials and constructions may be used while the small size of the panel and convenient mounting/boundary conditions, achieved using a compliant polymer foam suspension, over full or part perimeter.
  • Good results have been obtained with monolithic and composite panel constructions and due to the boundary conditions operative for a relatively small panel, metal can be used for example aluminium alloy from 0.15mm to 0.8mm thick, or copper tin, zinc amongst others.
  • Carbon fibre resin bonded monoliths are also useful 0.8mm down to 0.1mm in additional to various polymers, polycarbonate polystyrene and the like. Efficiency demands are not high and a wide variety of exciters may be used from 9mm pole diameter up to 19mm, depending on the required bandwidth and loudness .
  • Figure 9 is a graph of frequency response of a preferred exemplary ear speaker with a panel made from aluminium sheet and with an exciter in the position C of
  • the invention thus provides novel headphones which avoid the problems of pistonic devices without the cost penalties of electrostatic headphones.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Headphones And Earphones (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

L'invention concerne un casque (1) comprenant un serre-tête (2) muni d'écouteurs (3). Ces écouteurs comprennent chacun une source sonore se présentant sous forme d'une plaque (5) rigide légère et un excitateur (6) de vibrations permettant de projeter des ondes de flexion sur la plaque afin de produire une sortie acoustique.
PCT/GB2000/000331 1999-02-05 2000-02-07 Casque d'ecoute WO2000046786A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU24462/00A AU2446200A (en) 1999-02-05 2000-02-07 A headphone
JP2000597787A JP2002536899A (ja) 1999-02-05 2000-02-07 ヘッドフォン
EP00902717A EP1147680A2 (fr) 1999-02-05 2000-02-07 Casque d'ecoute

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9902442.4A GB9902442D0 (en) 1999-02-05 1999-02-05 A headphone
GB9902442.4 1999-02-05

Publications (2)

Publication Number Publication Date
WO2000046786A2 true WO2000046786A2 (fr) 2000-08-10
WO2000046786A3 WO2000046786A3 (fr) 2001-01-11

Family

ID=10847068

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2000/000331 WO2000046786A2 (fr) 1999-02-05 2000-02-07 Casque d'ecoute

Country Status (7)

Country Link
EP (1) EP1147680A2 (fr)
JP (1) JP2002536899A (fr)
CN (1) CN1337140A (fr)
AU (1) AU2446200A (fr)
GB (1) GB9902442D0 (fr)
TW (1) TW468357B (fr)
WO (1) WO2000046786A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013222231A1 (de) * 2013-10-31 2015-04-30 Sennheiser Electronic Gmbh & Co. Kg Hörer
US9648412B2 (en) * 2015-02-06 2017-05-09 Skullcandy, Inc. Speakers and headphones related to vibrations in an audio system, and methods for operating same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0321617D0 (en) * 2003-09-10 2003-10-15 New Transducers Ltd Audio apparatus
JP6079893B2 (ja) * 2013-09-27 2017-02-15 株式会社村田製作所 ヘッドフォン
CN103763648B (zh) * 2013-12-27 2017-06-09 圆展科技股份有限公司 耳机装置
WO2016181531A1 (fr) 2015-05-13 2016-11-17 Ｏｍｏｔｅｎａｓｙ合同会社 Casque

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4278852A (en) * 1977-08-31 1981-07-14 AKG Akustische u. Kino-Gertate Gesellschaft m.b.H. Earphone construction
US4338489A (en) * 1979-02-12 1982-07-06 Akg Akustische U. Kino-Gerate Gesellschaft M.B.H. Headphone construction
US4389542A (en) * 1979-08-23 1983-06-21 Akg Akustische U. Kino-Gerate Orthodynamic headphone
WO1997009842A2 (fr) * 1995-09-02 1997-03-13 New Transducers Limited Dispositif acoustique
DE19612481A1 (de) * 1996-03-29 1997-10-02 Sennheiser Electronic Elektrostatischer Wandler

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4278852A (en) * 1977-08-31 1981-07-14 AKG Akustische u. Kino-Gertate Gesellschaft m.b.H. Earphone construction
US4338489A (en) * 1979-02-12 1982-07-06 Akg Akustische U. Kino-Gerate Gesellschaft M.B.H. Headphone construction
US4389542A (en) * 1979-08-23 1983-06-21 Akg Akustische U. Kino-Gerate Orthodynamic headphone
WO1997009842A2 (fr) * 1995-09-02 1997-03-13 New Transducers Limited Dispositif acoustique
DE19612481A1 (de) * 1996-03-29 1997-10-02 Sennheiser Electronic Elektrostatischer Wandler

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013222231A1 (de) * 2013-10-31 2015-04-30 Sennheiser Electronic Gmbh & Co. Kg Hörer
WO2015063257A1 (fr) 2013-10-31 2015-05-07 Sennheiser Electronic Gmbh & Co. Kg Casque audio
US9900683B2 (en) 2013-10-31 2018-02-20 Sennheiser Electronic Gmbh & Co. Kg Headphones
US9648412B2 (en) * 2015-02-06 2017-05-09 Skullcandy, Inc. Speakers and headphones related to vibrations in an audio system, and methods for operating same
US20170245042A1 (en) * 2015-02-06 2017-08-24 Skullcandy, Inc. Speakers and headphones related to vibrations in an audio system, and methods for operating same
US10206027B2 (en) 2015-02-06 2019-02-12 Skullcandy, Inc. Speakers and headphones related to vibrations in an audio system, and methods for operating same

Also Published As

Publication number Publication date
JP2002536899A (ja) 2002-10-29
CN1337140A (zh) 2002-02-20
WO2000046786A3 (fr) 2001-01-11
GB9902442D0 (en) 1999-03-24
EP1147680A2 (fr) 2001-10-24
AU2446200A (en) 2000-08-25
TW468357B (en) 2001-12-11

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