CN102740199A

CN102740199A - Flat plate string vibration loudspeaker

Info

Publication number: CN102740199A
Application number: CN2011100847620A
Authority: CN
Inventors: 张侠辅; 张丽娜; 张旭
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-04-06
Filing date: 2011-04-06
Publication date: 2012-10-17

Abstract

The invention provides a flat plate string vibration loudspeaker which is composed of a plurality of magnetic bodies in parallel and uniformly-spaced arrangement and a conductive film running through the magnetic bodies. Each segment of the conductive film between the magnetic bodies is taken as a diaphragm which is a wave shaped film. All magnetic bodies and all diaphragms are fixed in a rectangular iron frame, and the whole loudspeaker is flat plate-shaped.

Description

Plate string-vibrating type loudspeaker

Technical field

Loud speaker belongs to a kind of electronic devices and components, and sounding usefulness is made at the terminal that is widely used in various electronic equipments and household electrical appliance.Plate string-vibrating type loudspeaker provides a kind of sound-reducing degree high sounding component for squeezing into the design of loud speaker high-end market at high pitch and middle register.

Background technology

Present most popular coil-moving speaker is German's invention in 1861, and its structure is the cone or the vibrating diaphragm that are in the circular coil in the magnetic field and are consolidated with it.Vibrated by the electromagnetic force effect, and vibrate the cone that promotes to be positioned at its place ahead with this and move together, recently decades; Replace the metal basin in addition of cone, plastic tub, wire mesh membrane etc.; But except material, outside shape and size were distinguished to some extent, their essential structure all was identical.In addition, other kind loud speaker also has piezoelectricity pottery magnetic speaker, because tonequality is very poor, seldom is used, and also has electrostatic loudspeaker, because cost is too high, also is not shown in market.Close to the string-vibrating type loudspeaker structure a strap and the ribbon speaker that magnetic field space is formed, but its range only limits to high pitch.The impossible strict conformance of the moving situation of each point on coil-moving speaker cone or the vibrating diaphragm; Thereby always there are three kinds of distortions inevitably in it; Be frequency distortion, phase distortion and amplitude distortion, string-vibrating type loudspeaker are expected to eliminate frequency distortion and these two kinds of distortions of phase distortion.

Summary of the invention

The basic structure of string-vibrating type loudspeaker; Be that a softness is had certain flexible strip-shaped conductive film; In a plurality of gaps that are full of magnetic field that polylith magnet steel framework forms; The strip-shaped conductive film is the tone currents carrier, again with the direct promotion air sounding in its surface, is a kind of dynamic speaker that voice coil loudspeaker voice coil and vibrating diaphragm are integrated.Because vibrating diaphragm is in the magnetic field fully, its free vibration is overcome by electromagnetic damping, owing to do not exist vibration to propagate into the process of another place by a place on the vibrating diaphragm, the vibration of vibrating diaphragm each point is synchronous, thereby distortion is very little.This loud speaker has the fidelity height, the advantage that transient response is good, and range is mainly in high segment and mid.It can be supporting with common woofer, forms high fidelity sound system.

Forerunner's work of string-vibrating type loudspeaker is " flexible vibrating membrane loudspeaker ", and this project is in the power of patenting in 1996, patent No. ZL94249167.X, string-vibrating type loudspeaker proposed one Chinese patent application, application number: 98108102 in 1998.9。Canadian patent application is proposed, application number 2236995 the same year.Again filed an application application number again to Patent Office of the People's Republic of China for supplemental content in 1999: 99114783.9。The pct international patent application has been proposed, application number the same year: PCT/CN99/00011, and obtain PCT international publication number: WO99/56499 in then.Filed an application to USPO in 2000, application number obtained United States Patent (USP) mandate, patent No. US6868166B1 in 09/677777,2005 year.The plate string-vibrating type loudspeaker that this paper proposes, its claims content is different with above-mentioned file.

String-vibrating type loudspeaker can be made many shapes, and they depend on the arrangement mode with magnet steel of choosing of magnet steel shape.Wherein more distinctive is dull and stereotyped moulding, and this paper specially proposes patent application with regard to plate string-vibrating type loudspeaker.It is suitable for the plate of flat liquid crystal display of computer supporting, also can be supporting with panel TV set, and its good anti-vibration can be used in the car in general auto loud hailer.As the radio station, the monitoring loudspeaker of TV station perhaps is placed in the tuning device, all suits.

Embodiment

The matrix of plate string-vibrating type loudspeaker is by a rectangle chase, and some magnets that are arranged in parallel that are fixed in the chase are formed.As shown in Figure 1.An effect of chase is the support as fixed magnets, and another effect is the magnetic field that masks loud speaker place in-plane, to reduce leakage field.Magnet is made up of 7 elements, and is as shown in Figure 2: the centre is the cuboid magnet steel of a bar shaped, and shown in (3) and (1) among Fig. 2 among Fig. 1, its magnetic direction is horizontal.Vertical along magnet steel, i.e. long side direction, each sticking square wood of a block length of two ends, or unit of plastic, like (2) among Fig. 2, two wooden end faces are identical with magnet steel face size size, make its close adhesion at magnet steel with the end face gluing that wood engages.Magnet steel and two wooden length overalls equal the inboard spacing of chase two opposite side.Be stained with the aluminium skin again in its two sides afterwards or other non iron thin plate is reinforced, shown in (3) among Fig. 2, at last on the plane at two magnetic poles places; The very little smooth film of one deck coefficient of friction of applying ointment or plaster, as scribble the film or the polytetrafluoroethylene film of graphite, shown in (4) among Fig. 2; Two ends have so just been made for wooden; The centre is a magnet steel, and the rectangular magnets of integument is arranged all around, shown in (2) among Fig. 1.With the mode of many such magnets according to parallel equidistant arrangement, adhere among the chase, just made the loud speaker matrix.The arrangement of magnet also must be that the adjacent pole mask of adjacent magnet steel has antipole property, promptly by adhesive each other but the orientation of drawing back a segment distance arrange, form space comparatively uniformly, a magnetic field therebetween.We the space between a pair of opposite magnetic pole in the gap that is full of magnetic field, shown in (4) among Fig. 1, in order to vibrating diaphragm is positioned over wherein.

A kind of manufacture method of strip-shaped conductive film is to be stained with copper cash in belt polyester film equal intervals, and perhaps copper-clad aluminum conductor can be only with wherein a kind of, also can two kinds uses simultaneously.These metal wires all are round wire, need earlier it to be rolled into lenticular wire, and are bonding with mylar tape again.In addition, also can use deposited copper polyimide film to obtain through the method for making printed circuit.The aluminized mylar of can also the use electric capacity of the dacron using.Belt is should differentiate electrically good, requires light and thin again.

The width of ready-made so banded film is less than two magnet steel adjacent pole interplanar distances; As directly be put in the gap that is full of magnetic field; Have bigger air-gap between two edges and magnetic pole strength,, must on its two edges, respectively add a movable magnetic limit and make the edge sealing bar for reduce this air-gap as far as possible.A kind of method is the mylar tape that on the strip-shaped conductive film, adds the same width of one deck, and this strata ester film only is connected together along center line and strip-shaped conductive symphysis, and tape of every betwixt then limit folder is shown in (1) among Fig. 3.Second method is the polyester film along each the sticking one deck doubling of strip-shaped conductive film edge, and with conduplication side inwards, opening edge is outside, sandwiches a tape inward from opening edge then when sticking, and this tape can be made with capstan, shown in (2) among Fig. 3.The third method be with tape after the center line doubling, on every edge of strip-shaped conductive film, each overlap a doubling tape, we claim that it is the magnetic overcoat, shown in (3) among Fig. 3.When the strip-shaped conductive film that accompanies tape or be with tape when this edge is put into the gap that is full of magnetic field; Tape receives magnetic attraction and stretches out to pole orientation; Up to the tape edge with till magnetic pole strength contacts, so dead the slit shutoff between strip-shaped conductive film edge and magnetic pole strength automatically.

The making of strip-shaped conductive film can also be used custom-designed inkle loom, and the metal lenticular wire is become strip with the polyster fibre blending; Metal lenticular wire wherein is parallel in the band as the part of warp, and belt will be done thinly as far as possible; Want gluing on the belt, with all yarn hole sealings.Two straps with such are superimposed together, and justified margin is stitched together two straps along center line with sewing machine, respectively sandwich a tape on the both sides of this bilayer zone at last, and belt has just been carried out.

After the strip-shaped conductive film is carried out, must be with those sections of preparing to put into magnetic field, the curved surface that the heating for fixing shape waviness rises and falls; Straight lines all on the curved surface is all vertical with metal wire, and is promptly vertical with the soft belt edge of conduction, makes and sees over along tape edges; Shape is like a sine curve; Shown in (1) among Fig. 4, tape or magnetic overcoat when preventing to heat on conductive diaphragm and the edge stick together, and must before heating, on their contact-making surface, smear one deck liquid fat.The belt remainder folds shown in (2) among Fig. 4, puts into ready-made loud speaker matrix to belt then.The method of putting is that preface is carried out piecemeal in order; Stick with glue first section straight portion that folds on rectangle chase sidewall; Again first waveform vibrating diaphragm is put into first space, in fact, the border in first space and the last space only is made up of a magnetic pole and chase inwall; But still have magnetic field to exist therebetween, still can be used as the gap of magnetizing and use.Plane, vibrating diaphragm place should belong to planes with matrix, makes that any straight line on the waveform vibrating diaphragm is all vertical with magnetic pole strength, and the waveform vibrating diaphragm should be positioned at the center, gap that is full of magnetic field.During installation, two tapes that are clipped in the conductive strips are pulled to magnetic pole by magnetic force, the gap shielding between conductive strips and magnetic pole; But must notice that the vibrating diaphragm two ends lean on the tape at wooden place to pull out with tweezers, its edge and wooden surface are fitted tightly, again with the two ends of waveform vibrating diaphragm; With filling in wood chip or the plastic sheet that has been coated with glue, it is anchored on the rectangle chase, between fixing point and chase; Should add insulating cell in advance, with anticreep or short circuit, the rigid insulation liner is put into behind gluing; Also can prop up the end of two adjacent magnets, play the effect of further reinforcing magnet.After this part is carried out, again second section straight portion sticked with glue on first magnet and chase side, and again second waveform vibrating diaphragm put into second gap that is full of magnetic field, so repeatedly, till the whole piece belt is put into matrix.

After belt is packed into, must among vibrating diaphragm edge and interlayer, smear small amount of engine oil or watch oil,, prevent to produce the friction noise in order to further to reduce friction and the friction of edge sealing bar and pole surface between edge sealing bar and belt.Also must cut out better netted sheetmetal or porous sheetmetal, they be shaped as rectangle, length is shorter slightly than magnet length; Width is wideer slightly than the gap between two magnets, and in wide size of coming out, chooses those positions near two ends; Two edges bend inwards and are a right angle; Be full of on two boundary faces in gap in magnetic field at each, i.e. the marginal position in vibrating diaphragm front and space, back, each blocks this netted sheetmetal of lastblock or porous sheetmetal; Make magnetic field in the gap as being in the iron cage, in the hope of reducing leakage field.

Last work is to be welded in strip-shaped conductive film two ends to two tone currents transmission lines, and loud speaker is packed in the flat, plastic shell.Respectively adsorbing the netted or cellular sheetmetal of one deck on the outer wall before and after the flat, plastic shell of loud speaker; Or when making plastic housing; Former and later two areas respectively add the netted or cellular sheetmetal of one deck in plastic housing in advance; The sheetmetal area is identical with rectangle chase area, with the leakage field of further former and later two directions of minimizing loud speaker.Like the loud speaker main body is not to put into the flat, plastic shell, but inserts audio amplifier, and then anti-leakage field net-shaped steel micromicro is as the audio amplifier front panel, and deposited iron sheet prevents leakage field on the audio amplifier wall, is about to audio amplifier and makes the audio amplifier with magnetic screen.

Description of drawings

Fig. 1 has drawn the framework arrangement mode of this speaker magnets, i.e. loud speaker matrix

Fig. 2 has drawn each rectangular 's of being arranged in parallel (abbreviation magnet) in the loud speaker matrix composition and manufacture method,

Be illustrated as the loose mail figure of all seven assemblies before being glued to together.

Fig. 3 drawn the diaphragm of loudspeaker not heating for fixing shape become wavy before, several kinds of design structure figure at its edge.

Fig. 4 has drawn the view of the variant functional section of strip-shaped conductive film of loud speaker.

Fig. 1: matrix; (1) chase, (2) magnet, (3) magnet steel, (4) are full of the gap in magnetic field.

Fig. 2: magnet; (1) magnet steel, (2) wood, (3) aluminium skin or other thin plate, (4) smooth film.

Fig. 3: marginal texture.

Fig. 4: strip-shaped conductive film; (1) waveform vibrating diaphragm, (2) straight portion.

Claims

1. we propose a kind of plate string-vibrating type loudspeaker, and its basic structure comprises a rectangle chase, and parallel some magnets that equidistantly are arranged in the chase, also have one through the strip-shaped conductive vibrating diaphragm between the magnet.Magnet is arranged by the orientation of mutual adhesive, and promptly the adjacent pole-face of adjacent magnet steel is a pair of opposite magnetic pole.Be spaced from each other a segment distance between magnet and the magnet, form a plurality of gaps that are full of magnetic field, magnet two ends and chase are fixed.A strip-shaped conductive film is successively in these gaps; Those sections that the strip-shaped conductive film passes in the gap that is full of magnetic field are called vibrating diaphragm; Vibrating diaphragm is heated and is shaped into the curved surface that waveform rises and falls, and when this root strip-shaped conductive film of tone currents process, its these vibrating diaphragms that are in the gap that is full of magnetic field will vibrate; Promote air with its surface simultaneously, send sound wave.

2. loud speaker as claimed in claim 1 is characterized in that, said magnet is made up of a rectangle magnet steel and the wooden unit or the unit of plastic that are fixed in these magnet steel two ends, and the other end of wooden unit or unit of plastic is fixed on the chase inwall.

3. loud speaker as claimed in claim 1 is characterized in that there is back-up coat the magnet two sides, and the magnet poles face has the very little overcoat of coefficient of friction.

4. loud speaker as claimed in claim 1 is characterized in that, on its two edges each additional movable magnetic limit; If said waveform conductive diaphragm edge sandwich then has a tape that can free in and out in interlayer, vibrating diaphragm is put into after the magnetic field, and tape is partly stretched out by poles attract, till magnetic pole strength is run at its edge.

5. loud speaker as claimed in claim 1 is characterized in that, on its two edges each additional movable magnetic limit; If said waveform conductive diaphragm single layer structure, but the magnetic overcoat of a free shift is then arranged on the edge of, vibrating diaphragm is put into after the magnetic field, and the magnetic overcoat is shifted to magnetic pole by poles attract, till magnetic pole strength is run at its edge.

6. loud speaker as claimed in claim 1 is characterized in that, is installed in the flat, plastic box like loud speaker, then described each be full of the gap in magnetic field before and after each card of border the netted or cellular sheetmetal of one deck is arranged, the sheetmetal area is identical with interval area.

7. loud speaker as claimed in claim 1; It is characterized in that; Be installed in the flat, plastic box like loud speaker; Respectively be added with the netted or cellular sheetmetal of one deck before and after then in the plastic housing of loud speaker, or respectively adsorb the netted or cellular sheetmetal of one deck before and after on the plastic housing outer wall, the sheetmetal area is identical with rectangle chase area.

8. loud speaker as claimed in claim 1 is characterized in that, scribbles liquid fat on conductive film two edges and the tape.