CN1319320A

CN1319320A - Loudspeaker

Info

Publication number: CN1319320A
Application number: CN99811160A
Authority: CN
Inventors: 亨利·阿齐马
Original assignee: New Transducers Ltd
Current assignee: NVF Tech Ltd
Priority date: 1998-10-13
Filing date: 1999-10-12
Publication date: 2001-10-24
Also published as: KR20010075442A; AU6213999A; GB9822246D0; GB0105807D0; CA2345749A1; ZA200101978B; WO2000022877A1; IL141966A0; GB2357215A; WO2000022877A8; BR9914147A; JP2002528019A; EP1121833A1; TW462206B

Abstract

A mid/high frequency loudspeaker drive unit comprising a stiff lightweight resonant panel form member, a housing in which the panel form member is mounted, a resilient suspension connected between the edges of the panel form member and the housing, the arrangement being such that the housing and the panel form member together define a sealed enclosure, and an electrodynamic exciter for applying bending wave energy to the panel form member to cause it to resonate to produce an acoustic output, the exciter comprising a magnet assembly rigidly fixed to the housing and defining an annular gap and a voice coil disposed in the annular gap and rigidly fixed to the panel form member near to the geometric centre thereof, the location of the voice coil in the annular gap being provided by the said resilient suspension.

Description

Loud speaker

The present invention relates to loud speaker, especially relate to the resonance panel-form loudspeakers, for example, the sort of described in the International Patent Application WO 97/09842, promptly so-called allocation model loud speaker.

In the past, be difficult to provide the loud speaker that covers middle and high frequency audiorange with high-quality.For independent middle pitch driver, very big in this scope directivity change, and be extended down to very difficulty of very high frequency.Generally, use two drivers, the frequency-selective network of dividing frequency scope between the two has increased cost and complexity.Transition frequency about 3 kilo hertzs, is that the human auditory is the most responsive for generally, has so just increased difficulty.

Of the present invention be contemplated that in the design one/high-pitched driver replaces previous two traditional drivers that use, and do not overlap in the critical zone, and directivity consistent, required width is arranged in its whole working ranges.

The allocation model loud speaker can be designed to work on some 8 overtone journey of audio band, although in the application such as for example high-fidelity, always this not best scheme.Can expect that it is suitable sometimes that the allocation model loud speaker uses with the infra-low frequency loud speaker of low frequency, these low frequencies for example about 100 to 200Hz are intersecting.

Therefore need a loud speaker or a minimum loudspeaker drive unit, might not work on 8 octaves, can work on 6 to 7 octaves, the material range of choice is wide, and can adopt various structures, and help on its whole working range, to make loud speaker the best.An example like this is, according to the high-fidelity middle pitch/high pitch driver element of distribution pattern principle work.By point of interface being designed to arrive away from critical 3kHz zone the scope of 1kHz, general 300-500Hz bring significant benefits can for the conventional loudspeakers system of boxlike, and, also can benefit from the good radiation characteristic relevant with distributed mode loudspeaker.

Requirement is high performance, the market of the miniature loudspeaker of continuous expansion having aspect multimedia and the computer peripheral equipment, and traditional television set, monitor and panel TV set also require better sound, compact structure more always.

Therefore, need so a kind of structure, it is very compact, has diversity and saving cost that a plurality of features are strengthened the property, used.

The invention provides the design of a kind of cost-benefit type, make configuration and the production technology that the manufacturer can optimization tool for all these application.

Basic conception of the present invention makes to produce to assemble to become easily, and has consistency around the simple structure of loud speaker " engine " or driver element.

According to invention, provide in one/the tweeter driver element, comprising: the plate shape element of the resonance of rigidity, lightweight; The shell of this plate shape element of dress in one; Outstanding the holding of elasticity that is connected between plate shape element and the shell, such layout makes shell and plate shape element constitute the housing of a sealing together; An electric vibrating exciter, crooked wave energy is applied to plate shape element, make its resonance and produce voice output, this exciter comprises the magnet assembly that is installed on the shell securely and has constituted an annular gap, with be arranged in the annular gap and be installed on the plate shape element a locational voice coil loudspeaker voice coil securely near its geometric center, the location of voice coil loudspeaker voice coil in the annular gap provided by outstanding the holding of described elasticity.

The bending stiffness of plate shape element can be between 0.15 Newton meter to 24 Newton meter and is preferably between 2 Newton meters and 9 Newton meters.

Can or use binding agent will vibrate that excitation device is bonded to plate shape element (title " plate " later on) and/or to housing with the method for injection molding.The voice coil loudspeaker voice coil of vibration excitation device can directly be bonded on the sounding board in the injection molded process of plate.In addition, the voice coil loudspeaker voice coil of excitation device also can be combined in the preformed perforate molded on the sounding board when assembling.Like this, just no longer need an independent voice coil loudspeaker voice coil carrier.

Plate can with outstanding hold co-molded.Suspension can be elastomeric material, for example plastics.

Plate can become a single piece body by injection molding, perhaps adopts foaming technique.This plate can be flat or crooked, and its thickness or cross section can change.

Housing can embedding conducting plug, and the signal of telecommunication is transported to vibration exciter effectively from the connector of shell rim.Like this, the assembling that just can automatically finish driver element be connected.

For example, based on reason attractive in appearance, driver element can wrap in other the molded item, to adapt with this application.For example, suitable decoration will make it be suitable for being surface mounted on the high-fidelity loudspeaker audio amplifier.Otherwise a suitable outer molded item will make loud speaker be converted to a multimedia speaker.Further, loud speaker can install to other structures such as television baffle box.

The present invention illustrates by the example in the accompanying drawing.Wherein:

Fig. 1 exposes its inner perspective view of situation in detail after one loudspeaker drive unit partly cuts;

Fig. 2 is the sectional side view of the loudspeaker drive unit of Fig. 1;

Fig. 3 is the frequency response curve of representative graph 1 and Fig. 2 driver element.

There is shown a loudspeaker drive unit 1, in being used as/high frequency driver, also can be as parts in the speaker system that also comprises a low frequency driver, in the case, in/high frequency and low frequency driver can be assembled in the common audio amplifier, perhaps is used for the single driver of the miniature loudspeaker of multimedia for example or computer or automobile.

Driver element 1 comprises the housing 2 that is roughly rectangle, housing 2 has the body 11 of a dish type, body 11 is surrounded by outward extending holding flange 3, forms porosely 12 on flange at regular intervals, so can housing be positioned on the audio amplifier of loud speaker for example by suitable securing member (not shown).Housing 2 can be made of plastic by the method for for example injection moulding, and the inner cross partitions flange 13 that forms, and to increase the rigidity of housing, also keeps the characteristic of its lightweight simultaneously.

Base portion 14 places of housing 2 are formed with shallow recess 4 inside, that be roughly circle.Recess 4 has a central through hole 16.Recess is suitable for fitly receiving the backboard 6 of a circle, and magnet assembly is fixedly mounted on the backboard with bolt 20.Exciter 5 comprises described magnet assembly and a voice coil loudspeaker voice coil and the cylindrical former assembly 8 that has constituted an annular gap 19.Assembly 8 is located in the annular gap, can move axially according to the signal of telecommunication that is applied on the voice coil loudspeaker voice coil.

Backboard 6 can take any mode easily to be fixed to housing.Therefore, backboard 6 can be fixed together with housing with the method for securing member or bonding or the method for one molding.

Near edge flange 3, the plate shape element 9 of resonance essentially rectangular, rigidity, lightweight holds 10 by the flexible foam that extends is outstanding around plate 9, and elasticity is installed on the housing 2.So housing and plate have constituted the chamber 15 of a sealing.Outstanding hold 10 and can be installed on plate 9 and the housing 2 by the method for bonding.Plate 9 is the distribution pattern plate according to the WO97/09842 instruction.The voice coil loudspeaker voice coil of excitation device 5/former assembly 8 is fixedly mounted in suitable activation point near the center on the plate 9 as instructing among the WO97/09842, in the bending wave lead-in plate, make plate resonance and the generation voice output.Voice coil and coil forming device assembly 8 have for example an annular installation elements or the pin 21 of plastics, are fixedly mounted in the end that assembly faces plate 9 mutually, are installed on the plate to help handle component, also can be by means of binding agent.Notice that what be of little use is, exciter 5 directly is connected on the housing 2, does not comprise outstanding holding between voice coil loudspeaker voice coil and magnet assembly, like this, only depends in voice coil loudspeaker voice coil fixed in the annular gap of magnet assembly that panel edges is outstanding holds 10 and realize.In this manner, exciter moving mass reduced, and improved its high frequency response.Magnet assembly can be thermally coupled to voice coil loudspeaker voice coil, and improving its power capacity, heat is from back side radiation that backboard 6 exposes.

Selectable, the local little mass objects 17 that is provided with for example restrains 12 from 2 and restrains, and is incorporated on the plate, and the resonance situation after the adjusting combination can suitably be repaired overall response in the best way.This technology has the special advantage of the low frequency ranges of extension assembly.Response by the coaxial perforate 18 extensible high frequencies of plate 9 and voice coil loudspeaker voice coil.Number voice absorbing material (not shown) can help reducing the amplitude of high-order standing wave and can further improving frequency response in chamber in chamber 15.

Above-mentioned driver element can have following specification:

Board size=210 * 148.5mm (A5 standard size)

Core=3mm polycarbonate honeycomb, the 3.5mm element diameter

The glass of top layer=100 micron braiding is strengthened the glass of polycarbonate superficial layer (0 °/90 ° top layer directions) percent 50 weight

Bending stiffness=5.6 Newton meters

Superficial density μ=0.7 kilogram/square metre

Zm=16 Newton-second/rice

Voice coil diameter=26mm

Voice coil loudspeaker voice coil places standard profile mode position (ratio is 4/9,3/7)

Big ferrite toroidal magnet improves BL and Power Processing.

As discussed, not outstanding holding between magnet and voice coil loudspeaker voice coil, plate is hanged by the foam around its edge and holds fix in position.Utilize the hole on the voice coil loudspeaker voice coil inner panel, can aim at and mounting panel accurately, help voice coil loudspeaker voice coil in the annular gap, to aim at.Also can near the housing upper board edge, society make alignment pin, prevent the plate sidesway.Fig. 3 shows the frequency response of this plate.

Can expect, driver element be made little change, response can be extended to ultrasonic wave range with high-quality piezoelectric actuator, this for being connected of the novel audio form of 50kHz or 100kHz, be useful.This performance has exceeded the scope of conventional piston technology.

The invention provides a kind of novel middle and high band loudspeaker driver element, solved in the known configurations with frequency overlapping problem and disperse relevant outstanding problem.

Claims

1. in one kind/and the tweeter driver element, comprising: the plate shape element of the resonance of rigidity, lightweight; The shell of this plate shape element of dress in one; Outstanding the holding of elasticity that is connected between plate shape element and the shell, such layout makes shell and plate shape element constitute the housing of a sealing together; An electric vibrating exciter, crooked wave energy is applied to plate shape element, make its resonance and produce voice output, this exciter comprises the magnet assembly that is installed on the shell securely and has constituted an annular gap, with be arranged in the annular gap and be installed on the plate shape element a locational voice coil loudspeaker voice coil securely near its geometric center, the location of voice coil loudspeaker voice coil in the annular gap provided by outstanding the holding of described elasticity.

2. loudspeaker drive unit as claimed in claim 1 is characterized in that, described housing comprises a dish type body that is centered on by holding flange.

3. loudspeaker drive unit as claimed in claim 2 is characterized in that, described dish type body comprises a through hole, and wherein, the magnet assembly of vibration exciter is fixedly mounted on the dish type body, and the part on its surface has been sealed the through hole in the body.

4. loudspeaker drive unit as claimed in claim 3 is characterized in that, comprises a recess that is arranged in the dish type body, and magnet assembly comprises a backboard that is installed in the dish type body, is formed with described through hole on the recess.

5. any one loudspeaker drive unit of claim as described above is characterized in that outstanding the holding of elasticity is foamed material.

6. any one loudspeaker drive unit of claim as described above is characterized in that plate shape element comprises the core that is clipped in the cellular material between the top layer, and its bending stiffness is 0.15 to 24 Newton meter.

7. loudspeaker drive unit as claimed in claim 6 is characterized in that, bending stiffness is 2 to 9 Newton meters.

8. each loudspeaker drive unit of claim as described above is characterized in that, comprise pass plate shape element, coaxial and radius is less than the perforate of voice coil loudspeaker voice coil with voice coil loudspeaker voice coil.

9. each loudspeaker drive unit of claim as described above is characterized in that, comprises that minimum one is installed on the plate shape element, is positioned to LF-response is produced damping, discrete mass.