CN1195462A

CN1195462A - Packaging

Info

Publication number: CN1195462A
Application number: CN96196709.9A
Authority: CN
Inventors: 亨利·阿兹玛; 马丁·科洛姆斯; 尼尔·哈里斯
Original assignee: New Transducers Ltd
Current assignee: NVF Tech Ltd
Priority date: 1995-09-02
Filing date: 1996-09-02
Publication date: 1998-10-07
Also published as: EA000860B1; ES2131954T3; DK0847672T3; EP0847672B1; EA199800259A1; DE69601732D1; RO119054B1; AU6880696A; DE69601732T2; JPH11512250A; CA2230704A1; EP0847672A2; WO1997009855A2; ATE177581T1; HK1008651A1; AU702873B2

Abstract

Packaging (111) comprising a board component (140), characterised in that the board is a distributed mode acoustic radiator (2) having a transducer (9) mounted wholly and exclusively on the radiator to vibrate the radiator to cause it to resonate.

Description

Packing

The present invention relates to a kind of packing, relate in particular to the packing that loud speaker is housed.

Proposed a kind of panel-form loudspeakers in GB-A-2262861, it comprises:

A resonance multi-mode transmitter components, it is a unit sandwich plate of being made and had the spacer core of horizontal honeycomb by two kinds of skin-materials, wherein plate is such, its bending strength (B) on all directions with respect to the plate quality (μ) of per unit surface area cube ratio be at least 10;

An erecting device, it is supported this plate or is connected to a support body frame on this plate in a kind of free undamped mode;

And an electromechanical drive unit that is coupled on this plate, it is used for responding the electricity input of speaker operation frequency band with excitation multi-mode resonance in expelling plate.

The element that embodiments of the invention use its characteristic, structure and configuration can be usually and/or distinguishingly obtain by our instruction of PCT application number (our case number for P.5711) of pending trial of fulfiling same period therewith.Such element thereby: have the ability to keep and propagate the vibrational energy of importing by bending wave in the operating area that extends to the element edge in (but needn't) laterally usually along thickness; With or make without the anisotropy of bending strength, have and in described zone, distribute and be of value to the mode of resonance vibrating mass of sound with the surrounding air coupling; And in described zone, have predetermined optimum position or place, this position or place are used for transducer apparatus, its effective active or moving parts particularly, this part for the acoustic vibration activity in the described zone and corresponding to such vibration activity sound content signal, normally the signal of telecommunication is effective.In the international application no of the pending trial of the same period therewith (our reel number for P.5711), looking forward to such element as or " passive " acoustic device at no transducer apparatus in application, such as being used for reverberation or being used for the sound filtration or being used for to a spatial sound " adjustment " acoustic device (voicing); And be used for having " active " acoustic device of transducer apparatus, such as sound source or loud speaker quite on a large scale are provided when providing the input signal that is converted into described sound, or be used for such as when being exposed to the microphone that to be converted under the sound of other signal.

The invention particularly relates to the packing that is equipped with as the acoustic device of forms such as loud speaker.Term " packing " means content is housed, and no matter whether this content is this property.

Above element be called the distributed acoustic reflector here and be intended as above-mentioned PCT application and/or other is in this feature that provides especially.

Packing according to the present invention comprises: comprise a plate spare, it is characterized by this plate is a distributed acoustic reflector, and a transducer fully also is installed on it exclusively, and this transducer makes described reflector vibration and makes its resonance.Described plate is one to accompany the plate of porous core between the top layer.Described plate comprises the foam plastics core that is clipped in the drawing board interlayer.Described transducer is a flexural piezoelectric device.

Described plate has formed the one side of a box.This box has a lid, and a device links to each other with described lid, starts described transducer along with the relative motion of described lid and described box.

Described packing also comprises a signal generator, amplifier and battery.

Mode is with reference to the accompanying drawings to the present invention's graphic extension in addition, wherein by way of example:

Fig. 1 is the international application no of common pending trial that shows our same period therewith ... the sketch of illustrated and claimed distributed mode speaker in (our case number be P.5711);

Fig. 2 a is the partial section along Figure 1A-the A line is got;

Fig. 2 b is the cutaway view that the distributed reflector shown in Fig. 2 a amplifies, and has shown the two kinds of structures that can replace;

Fig. 3 is the stereogram according to the packing of the embodiment of the invention;

Fig. 4 is the stereogram of a transducer.

With reference to the Fig. 1 in the accompanying drawing, shown the illustrated and panel-form loudspeakers 81 that requires in our international application no (our case number for P.5711) of common pending trial of same period therewith, it comprises the rectangular frame 1 that has resilient suspension 3, and described suspension centers in it and supporting a distributed acoustic expelling plate 2 week.Such as transducer 9 with reference to detailed description in our international application no (our case number be P.56831415) of pending trial of same period therewith, intactly and exclusively be installed on the plate 2 or preset bearing that wherein limits by x and y, the calculating that illustrates in our international application no (our case number be P.5711) of pending trial of the position in its orientation by same period therewith, in plate, make plate resonance launch output with the emission bending wave.

Transducer 9 is driven by a signal amplifier 10 such as audio frequency amplifier that is connected on the transducer by conductor 28.The load of amplifier and power demand can be standards fully, are similar to common tapered loud speaker, and its sensitivity level is 86-88dB/watt under the condition of indoor loading.The amplifier load impedance is roughly 6ohms, and Power Processing is 20-80watts.Wherein plate core and/or top layer are made of metal, and they can be for transducer plays radiator, the heat of the motor coil of transducer is left and therefore improve Power Processing.

Fig. 2 a and 2b are the local typical cutaway views of the loud speaker 81 of Fig. 1.Fig. 2 a has shown that framework 1, surround 3 and plate 2 cemented joint 20 by separately links together.The suitable frame material comprises the light weight framework, for example by the frame frame of making such as the extrusion metal or the plastics of aluminium alloy.Suitable surround material comprises the elastomeric material such as foam rubber and foamed plastics.The viscose glue of suitable joint 20 comprises viscose glues such as epoxy, polypropylene and cyanogen propylene.

Fig. 2 b has illustrated that on the ratio of amplifying plate 2 is rigidity weight templates that have such as the made core 22 of rigidity plastics foam 97, this rigidity plastics foam for example is the latticed matrix 98 that interlinkage polyvinyl chloride or metal forming, plastics or analog are made, its cell extends transverse to board plane, and by being enclosed such as the top layer 21 of the made opposition of paper, card, plastics or metal forming or thin plate.When its mesexine is made of plastics, can strengthen to improve their modulus in a kind of mode of knowing by using such as carbon, glass, kevlar (RTM) or similar fiber.

Top layer layer material and the reinforce that can look forward to comprises paper, bonding ply of paper, melamine glue and such as polyester film, kapton, polyvinyl chloride, phenol, polyester or relevant plastics, fibre reinforced plastics etc. and sheet metal or paper tinsel, comprises that again carbon, glass, kevlar (RTM), Nomex (RTM) are the fiber of various twisting thread (lays) such as aromatic polyamide and textile-like.Investigation to the Vectra level of liquid crystal polymer thermoplastic shows that they are useful for injection moulding such as the ultra-thin property top layer below the diameter 30cm or the top layer of smaller szie.This material self has formed the crystal structure of an orientation on the direction of spraying, this orientation is the preferential direction that high-frequency energy is propagated into well panel area from drive point.

Additional this and injection moulding other thermoplastic makes injection mold have location and alignment feature such as groove or ring, in order to the transducer element of accurate location such as motor coil and magnet suspension.Some additional more weak core material it is calculated that and help increasing such as local skin depth in 150% zone that reaches transducer diameter or the annular, strengthen that piece zone and help vibrational energy is coupled in the plate.The high-frequency response will be improved with softer foamed material by this device.

The core material that can look forward to had both comprised foamed plastic or foamed plastics or paper pulp material, even if suitable low-density aerosol metal, comprise the latticed of manufacturing or corrugated aluminium alloy sheet or paper tinsel again, or Kevlar (RTM), Nomex (RTM), common or bonding paper, and various synthetic plastic films.Some suitable core materials have been showed the spontaneous top layer that it is useful effectively and/or have been had natural enough intensity to be used to not have the top layer interlayer of laminate patch in its manufacture process.Known a kind of high performance its trade mark of latticed core material is called ' Rohacell ', and it can be used as expelling plate and does not have the top layer.From the aspect of reality, its objective is the comprehensive fineness and the intensity that obtain to be suitable for special purposes, particularly comprise the optimal components of core and top layer layer and the conduction between them.

Some optimization formulas that are used for plate use metal and metal alloy top layer, maybe can be for being the carbon fiber reinforce.All these, and the design of alloy aerosol or wire netting trellis core, actual radio shielding feature all will be arranged, this feature is important in some EMC use.Common plate or cone loudspeaker do not have intrinsic EMC screening ability.

In addition, the preferred dynamic transducer of piezoelectricity has insignificant electromagnetic emission or stray field.Common loud speaker has a big magnetic field, if not adopt special compensation countermeasure will reach 1 meter distance.

The position that need to keep shielding in application can or can be used a kind of conductivity foam when the mounting edge or similar connector for electrical connector of conduction portion manufacturing of suitable DML plate.

Suspension 3 can damping sheet 2 the edge in case the too much border movement of this plate.Can add or replace and adopt other damping,, can be connected to the position of choosing in the plate and come the too much motion of damping to be beneficial to even resonance on the plate such as wiring.This wiring can be that pitch base material is made, and as employed in common loudspeaker housing, perhaps can be made by elasticity or rigidity polymerization light sheet material.Some materials, particularly paper and card and some cores can self-dampings, if desired, and can non-rigid assembling viscose glue increases damping in the mechanism of plate by using elasticity assembling viscose glue.

Effectively describedly select damping to comprise special application to the light sheet material of plate and permanent connected device.Edge and angle are significant especially to low frequency modes main and its plate dispensed in small quantity.Being fixed with along the limit of damping device is beneficial to and produces the plate that its described light sheet material installs framework fully, although its angle may be often relatively free, such as for required low frequency operation.Attachment can be with viscose glue or self adhesive material.The damping form that other is useful aspect meticulousr effect and/or intermediate frequency and high frequency, can or be secured to the material of being scheduled in the above zone of light sheet material on the effectively central local location by suitable material especially.

It is two-way resembling top illustrated sound plate.The acoustic energy that sends does not from behind have very strong relation with the acoustic energy that sends previously on phase place.The result helps: acoustical power adds up in this room comprehensively, the propagation of equifrequent acoustic energy, reduced reflection and standing wave effect and helped that high-quality ground reproduces place and environment in the acoustical reproduction record.

Although the emission of sending from the sound plate mainly is unoriented, the percentage axle of the information relevant with phase place increases outward.Because the focus after the improvement of imaginary stereo image, the orientation of loud speaker are the same with picture, on the height when usually the people is upright, thereby provide the axle exterior orientation of favourable appropriateness, the stereoeffect of the best is provided for the audience who is seated usually.Equally, a triangle left side/right geometric figure with respect to the audience provides another angle component.The good stereo acquisition that comes to this.

Compare with common loudspeaker reproduction, the present invention also has the advantage at a group audience.The inherent propagation characteristic of sound plate audio emission has given its volume of not observing the square distance law of reciprocity of identical point source.Because the intensity that reduces with distance is much smaller than the intensity of being predicted by inverse square law, the result is for off-center and the bad hearer in position, and the plate loud speaker is compared its intensity field with common loud speaker and promoted a better stereophonic effect.This is because off-centered hearer can't suffer dual problem owing near the loud speaker approaching; At first near the loudness of loud speaker increases greatly, and the loudness of loud speaker far away then is corresponding to be reduced.

Panel-form loudspeakers flat, light weight also has advantage, and it is visually attractive, has good sound quality and only needs a transducer and the gamut sound that sends from each plate film does not have overlapping.

Fig. 3 shows the packing of loudspeaker techniques shown in a kind of Fig. 1 and 2 of having.As shown in Figure 3, this is packaged as box 111 shapes, and has a lid 139.At least a portion of this box or this box is made by the mixture that comprises the foam plastics core that is clipped in the drawing board interlayer, and forms as shown in Figure 2 a plate.Therefore, this box comprises the described distributed acoustic reflector with reference to Fig. 1 and 2.

Here, the back plate 140 of box is used to form the loud speaker 81 of a distributed emission type.Yet any plate such as the fruit structure that constitute each face of box are fit to can be used for loud speaker.Another lay down location of transducer 9 is shown in broken lines.

PZT (piezoelectric transducer) 9 is fixed on the inner face of plate 140 behind the box, and the acoustic generator/amplifier/battery unit 112 of plate 140 inner faces drives behind the box by also being fixed on.This unit 112 is by the switch control integrally formed with the articulated section.Described lid 139 is fixed on the box by this articulated section.Therefore, described acoustic generator starts when covering when starting.

In said structure, because the edge of each plate 2 forms the angle of box, so do not need the sort of framework 1 shown in Fig. 1 and 2 or suspension 3.

It should be understood that this not necessarily must be illustrated shape.For example, its shape can with content require corresponding.Like this, this packing can be made the shape of encapsulation CD etc., and is used for the sound equipment audiovisual of CD content or other relevant information is provided.Another example is that this packing can form a music box.An example again, this packing can be used for the sould illustration about content.

Fig. 4 shows a kind of transducer 9 that is used for distributed board 2, and it is the crystalline flexural piezoelectric device 27 that is installed in as on the disks such as brass 118, and is bonded to by for example binding agent 20 on the face of plate 2.At work, acoustical signal is added on the transducer 9 through lead 28, makes 27 bendings of piezoelectricity disk, and causes plate 2 local deformations, thereby launch bending wave in plate.

Claims

1. a packing comprises a plate spare, it is characterized in that, this plate is a distributed acoustic reflector, and a transducer fully also is installed on it exclusively, and this transducer makes described reflector vibration and makes its resonance.

2. according to the described packing of claim 1, it is characterized in that described plate is one to accompany the plate of porous core between the top layer.

3. according to claim 1 or 2 described packings, it is characterized in that described plate comprises the foam plastics core that is clipped in the drawing board interlayer.

4. according to claim 1 or 2 described packings, it is characterized in that described transducer is a flexural piezoelectric device.

5. according to the described packing of claim 4, it is characterized in that described bending apparatus is a crystal.

6. according to the described packing of above-mentioned arbitrary claim, it is characterized in that described plate has formed the one side of a box.

7. according to the described packing of claim 6, it is characterized in that described box has a lid, a device links to each other with described lid, starts described transducer along with the relative motion of described lid and described box.

8. according to the described packing of claim 7, it is characterized in that described packing also comprises a signal generator, amplifier and battery.