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WO2000069214A2 - Excitateur de vibrations - Google Patents

Excitateur de vibrations Download PDF

Info

Publication number
WO2000069214A2
WO2000069214A2 PCT/GB2000/001545 GB0001545W WO0069214A2 WO 2000069214 A2 WO2000069214 A2 WO 2000069214A2 GB 0001545 W GB0001545 W GB 0001545W WO 0069214 A2 WO0069214 A2 WO 0069214A2
Authority
WO
WIPO (PCT)
Prior art keywords
panel
exciter
vibration exciter
adhesive
bending
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.)
Ceased
Application number
PCT/GB2000/001545
Other languages
English (en)
Other versions
WO2000069214A3 (fr
Inventor
Charles Bream
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.)
NVF Tech Ltd
Original Assignee
New Transducers 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
Priority claimed from GBGB9910450.7A external-priority patent/GB9910450D0/en
Priority claimed from GBGB9911039.7A external-priority patent/GB9911039D0/en
Application filed by New Transducers Ltd filed Critical New Transducers Ltd
Priority to AU44196/00A priority Critical patent/AU4419600A/en
Publication of WO2000069214A2 publication Critical patent/WO2000069214A2/fr
Publication of WO2000069214A3 publication Critical patent/WO2000069214A3/fr
Anticipated expiration legal-status Critical
Ceased 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
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/006—Interconnection of transducer parts
    • 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 invention relates to vibration exciters, more particularly for use in applying bending wave energy to panel-form structures to form loudspeakers, e.g. cf the kind described in WO97/09842.
  • WO97/09859 teaches the direct connection cf a voice coil cf an electrodynarnic vibration exciter to a bending- wave panel using adhesive means, and a range cf adhesives may be used to achieve such bonding.
  • Three frequently used types are; cvanoacrylates (so-called Super Glue), two-part epoxies and doubled-sided adhesive pads. These all exhibit limitations mclu ⁇ m ⁇ :- 1. m production, wet adhesives are difficult to apply, particularly to castellated exciters;
  • gap-filling adhesives such as two-part epoxies, require relatively large bond-line thicknesses to achieve maximum bond strength
  • double-sided adhesive pads add (often unwanted) compliance at the exciter-panel interface
  • the exciter needs to be grounded if a double-sided adhesive pad is used with a castellated exciter coupler in view of the limited bond strength due to small bond area.
  • the invention is a method of making a loudspeaker comprising attaching a vibration exciter to a bending-wave panel by bringing the vibration exciter and the panel into contact over an area, and applying ultrasound energy to the contact area.
  • the attacnment may be by ultrasonic welding.
  • the vibration exciter may nave a thermoplastic component, and the oen ⁇ mg-wave panel may have a thermoplastic component, and the respective thermoplastic components may be welded together.
  • the vibration exciter may be electrodynamic and its said thermoplastic component may be a mounting foot attached to a voice coil.
  • the mounting foot may be formed with a mounting face having at least one sharp projection in which the ultrasonic energy is concentrated during welding.
  • the method may comprise engaging the at least one foot and pressing the at least one foot into contact with the panel during application of the ultrasound energy.
  • the bending-wave panel thermoplastic component may be a face skin on the panel.
  • the method may comprise arranging a thermally responsive adhesive to be present at the contact area and between the panel and the exciter and applying ultrasound energy to the adhesive to actuate the adhesive to bond the exciter and panel together.
  • the adhesive may be applied to the contact area n the form of a film.
  • the ultrasound energy may be applied to a face of the panel opposite to that to which the vibration exciter is attached.
  • Figure 2 is a partial perspective view of a clamping tool for applying the vibration exciter to the panel during welding
  • Figure 3 is a schematic generally similar to that of Figure 1 of another embodiment.
  • FIGS 1 and 2 of the drawings there is shown a method of making a loudspeaker consisting of a bending wave panel 1 and an electrodynamic vibration exciter 2 having a voice coil assembly (not shown) having an array of thermoplastic mounting feet 4 by which the voice coil assembly is fixed to the panel 1.
  • Each foot 4 is formed witn a sharp point or pro ection 5 projecting downwardly towards tne panel face so that welding energy, applied to the face of the panel opposite to that to whicn the exciter 2 is to be attached via the horn tip 6 of an ultrasonic welder (not shown) , is concentrated in the area of the projections 5 during welding.
  • the tip 6 is moveable towards and away from the under face of the panel as indicated by arrow B.
  • the basic principle of ultrasonic welding is to locally melt the two components to oe bonde ⁇ at the oond site.
  • vibrational energy is applied remotely from the weld-line or positions and the energy is transferred through the component to the interface, where the resulting frictional energy is converted to heat in the energy director.
  • the material will be heated to above its melt temperature and the components will weld/fuse together, under moderate pressure.
  • the feet 4 are formed with grooves 7 which can be engaged in the notches 8 in respective forked clamping members 9 which are movable as indicated by arrows A both towards and away from the panel 1 and laterally across the panel to locate the exciter accurately in position, after which the members 9 can clamp the exciter by its feet 4 to the panel to allow welding to take place. The members 9 can then be withdrawn laterally away from the exciter.
  • the whole exciter 2 may be pressed downwards to bring its mounting foot or feet into contact with the panel surface.
  • voice coil limit stops (not shown) in the exciter to prevent excessive voice coil movement.
  • the main requirements for a successful weld are:- 1. Both components (exciter coupler and panel faceskin) are made from the same or compatible thermoplastic material e.g. plastics; 2. Suitable design and position of the energy directors, and 3. Supply of the correct amount of energy in terms of both frequency and power.
  • the panel skin is of a plastics material
  • the part of the exciter it will normally be necessary for the part of the exciter to be mounted to the resonant panel to be of a similar plastics material. Since we would normally wish to fix the voice coil of an electrodynamic exciter to the panel and since the voice coil may be of metal, the end of the voice coil to be mounted on the panel is secured to a foot in the form of a moulded plastics ring, which may, if desired, be castellated.
  • Typical processing parameters are l-2 W supplied at 20 kHz or 35kHz, producing tip amplitudes of 50-60 ⁇ m. Generally the higher frequencies are used for delicate components such as electrical switches.
  • the power can be delivered to either the panel or directly to the exciter foot.
  • the panel faceskin may be textured in the vicinity of the weld to improve the weld.
  • 25mm NEC (polycarbonate coupler) and 25mm Peerless (glass reinforced polycarbonate coupler) exciters are compatible with "Trauma-Lite" TM panel materials (woven glass reinforced polycarbonate faceskins) .
  • Figure 3 shows a method of making a loudspeaker by mounting an inertial vibration exciter 2 on a bending wave panel 1 using ultrasonic energy which is generally similar to that of Figures 1 and 2, but in this case the joining method involves activating a thermally responsive film 11 of adhesive, which may be thermosetting or thermoplastic.
  • the feet 4 are pressed against the panel, or rather against the adhesive film 11 on the panel, e.g. by a clamping tool 9, and ultrasonic energy is applied to the panel via the horn tip 6 to activate the adhesive to join the components 1 and 2 together.
  • Ultrasonic welding or bonding of exciters to panels overcomes many of the problems associated with conventional adhesive mountings, including: -
  • the invention thus provides a novel and useful method of making bending-wave panel loudspeakers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

L'invention a pour objet un procédé de fabrication d'un haut-parleur. Ce procédé consiste à fixer un excitateur de vibrations à un panneau d'ondes de flexion en amenant l'excitateur de vibrations et le panneau en contact sur une zone, et en appliquant une énergie ultrasonique sur la zone de contact.
PCT/GB2000/001545 1999-05-06 2000-05-04 Excitateur de vibrations Ceased WO2000069214A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU44196/00A AU4419600A (en) 1999-05-06 2000-05-04 Vibration exciter

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB9910450.7A GB9910450D0 (en) 1999-05-06 1999-05-06 Vibration exciter
GB9910450.7 1999-05-06
GB9911039.7 1999-05-12
GBGB9911039.7A GB9911039D0 (en) 1999-05-12 1999-05-12 Vibration exciter

Publications (2)

Publication Number Publication Date
WO2000069214A2 true WO2000069214A2 (fr) 2000-11-16
WO2000069214A3 WO2000069214A3 (fr) 2001-01-04

Family

ID=26315516

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2000/001545 Ceased WO2000069214A2 (fr) 1999-05-06 2000-05-04 Excitateur de vibrations

Country Status (3)

Country Link
AU (1) AU4419600A (fr)
TW (1) TW474110B (fr)
WO (1) WO2000069214A2 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT338351B (de) * 1975-04-29 1977-08-25 Philips Nv Elektroakustischer wandler, verfahren zur herstellung eines solchen wandlers und vorrichtung zur durchfuhrung solcher verfahren
US4071111A (en) * 1976-04-28 1978-01-31 Acoustic Fiber Sound Systems, Inc. Weatherproof loudspeaker assembly and method of making same
JPS59149496A (ja) * 1983-02-16 1984-08-27 Onkyo Corp 動電型スピ−カの組立体
DE4142455A1 (de) * 1991-12-20 1993-06-24 Hoechst Ceram Tec Ag Verfahren zur herstellung piezoelektrischer tongeber
AT400911B (de) * 1993-03-04 1996-04-25 Koninkl Philips Electronics Nv Elektroakustischer wandler mit einer trennwand und einer maskenwand
ATE205040T1 (de) * 1994-06-01 2001-09-15 Harman Audio Electronic Sys Lautsprecher
DE19529848C1 (de) * 1995-08-12 1997-01-23 Bosch Gmbh Robert Verfahren zur Befestigung des Zentrierteils eines Konuslautsprechers
UA51671C2 (uk) * 1995-09-02 2002-12-16 Нью Транзд'Юсез Лімітед Акустичний пристрій

Also Published As

Publication number Publication date
WO2000069214A3 (fr) 2001-01-04
AU4419600A (en) 2000-11-21
TW474110B (en) 2002-01-21

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