EP0967831A2 - Mobil coil device and method for its implementation - Google Patents

Abstract

The first radial zone of the centering diaphragm (10) lies open towards the upper end of the coil former. Soldering points are embedded in the adhered seam (26). An Independent claim is included for the corresponding method of construction.

Description

Technical field

The invention is concerned with the training and manufacture of Voice coil arrangements, with a particular focus on the Weight reduction of such arrangements lies.

State of the art

Voice coil arrangements in the sense of this application essentially comprise one Voice coil former with voice coil, a centering membrane and strands. The is in As a rule, tubular voice coil carriers are connected to the voice coil. The centering diaphragm is arranged at an axial distance from the voice coil and likewise connected to the voice coil former by means of an adhesive seam. The centering membrane, which extends radially to the longitudinal extent of the voice coil bobbin depends on Training either an accordion or wavy contour. The two Voice coil wires of the voice coil are each connected to one of the solder points both strands conductively connected.

For the formation of voice coil arrangements, which in many cases as a prefabricated part used for loudspeaker production have in the prior art in developed two main manufacturing processes.

According to the first known method, the voice coil is first placed on the carrier wrapped and baked and then the inside diameter of the neck of the Membrane connected to the outer diameter of the voice coil former. If the Voice coil wires before connecting the membrane to the voice coil former were not soldered to the strands, they are now soldered to the strands connected. Then a bead of adhesive is applied to the neck of the membrane the centering membrane was pushed over the voice coil and with the Glued outside diameter of the neck of the membrane. If the solder points are not already there sliding the centering membrane onto the underside, they are now glued to the underside of the membrane.

According to the further known method, the voice coil with the Voice coil former and the voice coil wires over the soldering points with the strands connected.

Then the solder points are glued to the voice coil former. Then will the centering membrane from the end of the voice coil bobbin, which is not with the Connected membrane, pushed onto the voice coil former and by means of a Adhesive seam, which is between the adhesive points for the soldering points and the voice coil is attached to the voice coil former.

Compared to the first procedure, this procedure has the disadvantage that relatively much adhesive for attaching the centering membrane to the voice coil former necessary is. This is due to the fact that the centering membrane in the second Procedure must have a relatively large inner diameter in order to Sliding the centering membrane over the voice coil will damage the Exclude voice coil. Another reason for the high use of adhesive is that with this procedure, the soldering points are already attached to the voice coil former and thus the adhesive nozzle - should guide it around the voice coil former without obstruction at least the vertical distance between the soldering point and the centering membrane must adhere to the centering membrane from above the soldering points or to ensure from above the strands bent to the side.

Sliding the centering membrane from the end of the voice coil former, which later connected to the membrane, is ruled out in this procedure. Though a small inner diameter of the centering membrane would then be possible, however this cause the centering membrane between the soldering points and the end of the Voice coil former, which is later connected to the membrane, arranged must become. A lower pushing down of the centering membrane with less Inside diameter over the soldering points and their fixation on the voice coil former is at Such a process modification is not possible because of the smaller inner diameter would destroy or remove the fixation of the soldering points on the voice coil former. Finally, the second method also has the same as the first method Disadvantage that the additional fixation of the solder points on the voice coil former whose shock must be made completely adhesive-tight to prevent penetration of Adhesive, which is necessary for fixing the solder points, to the inside of the Exclude voice coil former. This additional seal works weight increasing.

To complete the voice coil arrangement is then according to the second Method of the voice coil former still connected to the membrane, although the The voice coil former and membrane are only connected at one time can, in which the voice coil former and the centering membrane already in one Speaker basket is mounted.

While the first procedure requires a lot of manual work and therefore opposite the further method is relatively labor intensive, have voice coil arrangements according to the further process the additional disadvantage that because of the need the fixation of the soldering points on the voice coil former such voice coil former compared to voice coil bobbins, which are in voice coil arrangements after the first Process used, with otherwise identical conditions a 4-5 mm larger Have overall height. Apart from the fact that the greater height of the voice coil bobbin is also associated with an increase in weight, this additional height also acts as additional spring, which has a negative impact on the force applied to the membrane. The latter manifests itself in particular in a deteriorated height reproduction. Independently of the latter aspects have voice coil arrangements which operate according to both known methods are produced, the general disadvantage of that to their training a total of three adhesive seams are necessary, namely for the connection of membrane and Centering membrane with the voice coil former as well as for fixing the Solder points on the membrane or the voice coil former. Therefore, the invention is the Task based on a weight-reduced voice coil arrangement and a automatable process for their manufacture.

Presentation of the invention

This object is achieved in terms of the device with the features of claim 1. Advantageous further developments of the invention can be found in claims 2-6.
A method for manufacturing an arrangement according to any one of claims 1-6 is specified in claim 7. Another manufacturing process can be found in claim 8. Advantageous refinements for both methods are specified in claims 8-10. If, according to claim 1, the first area of the respective contour of the centering membrane opens in the direction of the upper end of the voice coil bobbin and the respective soldering points are arranged in the adhesive seam arranged between the voice coil bobbin and the said area, the otherwise customary additional fixings for the soldering points are eliminated, thereby reducing the adhesive weight is saved. In addition, the space which arises between the first area of the centering membrane and the voice coil support when the centering membrane is connected to the voice coil support also acts as an adhesive joint and prevents the adhesive introduced into it from continuing to run in the direction of the voice coil.

According to claim 3, the inner diameter of the neck of the membrane is substantially equal to the outer diameter of the voice coil former and the neck of the membrane dips at least partially in between the first area and the voice coil bobbin existing adhesive seam is a very compact voice coil arrangement with minimal Height created. In addition, the partial or full use of the Adhesive seam between the first area of the centering membrane and the Voice coil holder for fastening the membrane to reduce weight.

This compactness of the arrangement is also given if, according to claim 4, the neck of the Membrane is smaller / equal to the inner diameter of the voice coil former and the neck is inserted and connected in the voice coil former.

A particularly compact arrangement is given according to claim 5 when the adhesive seam between the first area of the centering membrane and the voice coil former and the Neck of the membrane have substantially the same axial distance from the voice coil.

Since according to this invention, the centering membrane over the voice coil on the Voice coil holder is pushed on, it is necessary that the centering membrane in the A relatively large comparison to the outer diameter of the voice coil former Has an inside diameter so as not to damage the voice coil when pushed on. This requires - as already stated in the prior art - a relatively large one Glue insert. This should take into account the embedding of the solder points in the adhesive seam or the use of the adhesive seam for fastening the membrane (claim 3) after the According to the invention, the use of adhesive, which is already low, can be reduced even further Claim 6 the first area of the respective contour of the centering membrane on its Voice coil former next end to be provided with a sealing lip, which in the Voice coil carrier connected condition is substantially perpendicular to this. At this point it should be pointed out that between the centering membrane and the Sealing lip not necessary must be the same material. The sealing lip in the Have a reduced thickness compared to the rest of the centering membrane. This the Flexibility of the sealing lip increasing measures cause damage to the Voice coil can be prevented when pushing on the centering membrane, although the Inner diameter of the centering membrane provided with the sealing lip essentially corresponds to the outer diameter of the voice coil former. In addition, the flexible sealing lip prevents deformation and out-of-roundness of the centering membrane, if this is connected to the voice coil former. If you assume that the centering membrane itself has sufficient flexibility and therefore none There is a risk that the voice coil at the same diameter ratio Postponing the centering membrane would damage if the Centering membrane has reached its end position on the voice coil former, close to Fit voice coil former. But since between the voice coil and the Centering membrane, the coil wires or strands are carried out, causes this Circumference of a slight deformation of the centering membrane, which negatively affects the Resilience of the speaker affects. But is the centering membrane with a sealing lip provided, the deformation caused, for example, by the coil wires plays out only in the sealing lip, which maintains the roundness of the centering membrane remains. For the sake of completeness, it should be pointed out that the sealing lip does not open this invention is limited but also used in voice coil assemblies can be described, which have been described in the prior art.

A complete automatability of a method for producing a voice coil arrangement according to one of claims 1-5 is given according to claim 7 if - afterwards the voice coil with the voice coil former and the voice coil wires The centering membrane from the lower end is connected to the strands via the soldering points the voice coil former from the voice coil onto the voice coil former is pushed open, then the adhesive seam between the first area of the centering membrane and the voice coil former is formed and then the membrane with the Voice coil former is connected. In this case, the slide open Centering membrane because of their realistically large thickness as a height stop for the centering membrane. In addition, this procedure does not require a complex process Thread the voice coil wires or strands, as these are pushed on by the Fix the centering membrane from the lower end of the voice coil former.

If the centering membrane has reached its end position on the voice coil former, lie the solder points between the first area of the respective contour of the centering membrane and the voice coil bobbin so that to make a permanent connection of Centering membrane, solder points and voice coil former only one adhesive seam in the Gap between the voice coil bobbin and the first area must be formed. In other words, in that the solder points in the space between the Voice coil carrier and the first region of the centering membrane can be arranged the adhesive seam between the centering membrane and the voice coil former also for fastening the solder points are used.

The same advantageous procedure is also in accordance with the combination of features Claim 8 given, in which only before pushing on the centering membrane Adhesive seam or adhesive points are formed on the voice coil former, which for Later attachment of the centering membrane and the soldering points on the voice coil former to serve.

In this context, it is very advantageous if the adhesive seam is already in front of the Fixing and tightening the strands is formed, because in this case a special one good attachment of the solder points to the voice coil former can be achieved.

If necessary, the voice coil wires and those connected to them Strands fixed according to claim 9 above the upper end of the voice coil former and / or be taut. Is the centering membrane with the voice coil former still not firmly connected, this causes a close concern. Likewise, with a Tightening connected slight sideways movement of the strands into the solder points Pull the adhesive seam, with which unavoidable tolerances in the distance from the solder points to Voice coil can be compensated and in any case it is ensured that the There are solder points in the adhesive seam. Just for the sake of completeness that with a tensile effect on the coil wires or strands that close to the winding Areas of the coil wires on the voice coil former must be fixed in order to Tightening to avoid loosening of turns of the voice coil.

A particularly advantageous procedure is given according to claim 10 if - Before the adhesive seam has hardened - the strands are essentially arched over the surface of the centering membrane facing away from the voice coil. This arcuate guiding of the strands causes the strands to relate to their later course after the adhesive seam has hardened in the area of the connection of the voice coil former, Solder points and centering membrane are given a preferred direction. In addition, the The fact that the first area of the centering membrane is towards the upper end of the Voice coil former opens, bringing about the preferred direction without sharp Transitions.

Brief presentation of the figures

Fig. 1 a

eine Zentriermembran;

Fig. 1 b

einen Schwingspulenträger;

Fig. 2 a

einen Schwingspulenträger mit Zentriermembran;

Fig. 2 b

eine Membran;

Fig. 3

einen Ausschnitt einer Zentriermembran; und

Fig. 4

eine Schwingspulenanordnung.

Show it:

Fig. 1 a

a centering membrane;

Fig. 1 b

a voice coil former;

Fig. 2a

a voice coil former with centering membrane;

Fig. 2 b

a membrane;

Fig. 3

a section of a centering membrane; and

Fig. 4

a voice coil assembly.

Ways of Carrying Out the Invention

The invention will now be explained in more detail with reference to the figures.

In Fig. 1a, a centering membrane 10 is shown in a sectional view. It is clear this representation can be seen that the centering membrane 10 is an accordion-shaped Has contour and has an opening 11 centrally. The opening 11 immediately bordering area of the centering membrane 10 is the one in this application is designated as the first region 12. Since in the present case the contour of the centering membrane 10 is accordion-shaped, the first region 12 has with respect to the center line an oblique course.

des Schwingspulenträgers 13 ist die Schwingspule 18 am Schwingspulenträger 13 befestigt.In Fig. 1b, a voice coil bobbin 13 is shown, which is tubular. This voice coil bobbin 13 is arranged on a working mandrel 14 which fills a space 15 encased by the voice coil bobbin 13 and exits the voice coil bobbin 13 at the upper end 16 thereof. Near the bottom 16

of the voice coil bobbin 13, the voice coil 18 is attached to the voice coil bobbin 13.

The two voice coil wires 19, which are connected to the voice coil 18, are on the outer jacket 20 of the voice coil bobbin 13 in the direction of the upper end 16 of the Voice coil former 13 is guided along and in each case by means of a soldering point 21 with the likewise on the outer jacket 20 of the voice coil bobbin 13 along strands 22 conductively connected. The contact of the coil wires 19, the soldering points 21 and the strands 22 on the outer jacket 20 of the voice coil bobbin 13 was achieved in that the strands 22 in notches 23 arranged at the upper end of the working dome 14 and were pulled tight. The notches 23 are only mentioned as examples. Rather, it can Tightening and fixing the strands 22 also in another familiar to the person skilled in the art Way. It is particularly advantageous if the stranded wire is on the voice coil former attached notches.

If the centering membrane 10 shown in FIG. 1 a is now in the direction of arrow P1 at the lower end 16 When pushed onto a voice coil bobbin 13 according to FIG. 1b, conditions are established which are shown in FIG. 2a. For better representation, the voice coil bobbin 13 has been rotated by 90 ° in the clockwise direction compared to FIG. 1b in FIG. 2a. 2a that the inner edge 24 of the centering membrane 10 bears on the outer jacket 20 of the voice coil bobbin 13 up to a small distance A and that the first region 12 of the centering membrane 10 opens in the direction of the upper end 16 of the voice coil bobbin 13 . This small distance from the edge 24 is necessary in order to avoid damage to the voice coil 18 when the centering membrane 10 is pushed onto the voice coil former 13 from the lower end 16 'thereof. In this context, it should not be left unmentioned that the centering membrane 10 can also be pushed onto the voice coil former 13 from the upper end 16 thereof, since the soldering points 21 are relatively relative to the distance relationships between the centering membrane 10 and the voice coil former 13 when pushed in this direction can be easily overcome. If the centering membrane 10 is to lie largely without distance on the voice coil support 13 to reduce the use of adhesive and nevertheless damage to the voice coil 18 or the soldering points 21 is to be excluded when the centering membrane 10 is pushed on, the centering membrane 10 is at its edge 24 as shown in FIG. 3 to provide a sealing lip 12 'which, when connected to the voice coil bobbin 13, extends at right angles to the latter. This sealing lip 12 ', which in the present case is integrally connected to the rest of the centering membrane 10, but has a significantly reduced thickness, has the effect that the space 25 formed between the first region 12 and the voice coil bobbin 13 downward (as shown in FIG. 2a) is closed and therefore cannot be penetrated by the introduced adhesive.
Since FIG. 2a, like all the other figures, shows the situation only schematically, in FIG. 2a the illustration of the tight fit of the coil wires 19 and strands 22 on the voice coil former 13 caused by the pulling of the strands 23 has been omitted in FIG. 2a. The visible soldering point 21 lies between the first area 12 of the centering membrane 10 and the outer jacket 20 of the voice coil bobbin 13. The gluing between the voice coil bobbin 13, the centering membrane 10 and the soldering point 21 was realized such that in the space 25 between the first area 12 and an adhesive seam 26 was formed on the outer jacket 20 of the voice coil bobbin 13.

For the sake of completeness, it should be pointed out that the adhesive seam 26 at least partly in another - not shown - embodiment even before Sliding the centering membrane 10 onto the voice coil bobbin 13 or fixing and tightening the strands 22 on the voice coil bobbin 13 can be formed. In In this case, the centering membrane 10 is then pushed into the adhesive seam 26. This previous application of the adhesive seam 26 has the advantage that complete gluing the soldering points 21 is ensured.

The centering membrane 10 has its end position shown in FIG. 2a on the voice coil former 13 taken and the adhesive seam 26 is formed, the strands 22 should Notches 23 taken or in another - not shown - embodiment the respective clamping and fixing arrangement in the direction of arrow P2 in an arc over the Top 27 of the centering membrane 10 are guided. Then the adhesive seam 26 hardens, the strands 22 already have a certain preferred direction with respect to their later ones Attachment points on the speaker basket (everything not shown in Fig. 2a).

2b shows a membrane 28 which has a neck 29. Is the Inner diameter greater than / equal to the outer diameter of the voice coil former 13 and the membrane 28 is lowered onto the voice coil bobbin 13 in the direction of the arrow P3, conditions arise, which are shown schematically in FIG. 4.

4 that the neck 29 of the membrane 28 to into the adhesive seam 26 between the voice coil bobbin 13 and the centering membrane 10 dipped and also connected to the voice coil bobbin 13 via the adhesive seam 26 is. If necessary, further ones lying outside the adhesive seam 26 can be used Connection areas between the neck 29 of the membrane 28 and the voice coil bobbin 13 be present (not shown). Is the strand 22 - as already in connection with Fig. 2a indicated - guided in an arc over the surface 27 of the centering membrane 10 and then hardens the adhesive seam 26, the strand has a preferred direction without sharp-edged transitions are required. The latter is also moving towards the upper end of the voice coil bobbin opening areas 12 of the centering membrane 10 supports.

For the sake of completeness, it should be added that, for example, at Voice coil carriers 13 made of a conductive material for the two soldering points 21 Avoiding short circuits should be isolated from each other. However, they will Strands with a preferred direction shown in Fig. 4 and leads the award of Preferred direction that neither over the centering membrane nor over the Voice coil bobbin 13 there may be a short circuit between the two soldering points, so the adhesive seam 26 can also be used as insulation.

Claims (10)

Voice coil arrangement with a voice coil bobbin 13, which has an upper end 16 and a lower end 16 ', with a voice coil 18 which has two voice coil wires 19 and which is attached to the voice coil support 13, with a centering membrane 10 arranged at an axial distance from the voice coil 18, which has an accordion or wave-shaped contour, which is connected to the voice coil former 13 by means of an adhesive seam 26 transversely to the longitudinal extent thereof, the adhesive seam 26 between the voice coil former 13 and a first, the Voice coil former 13 lies directly opposite region 12 of the respective contour of the centering membrane 10, and with two stranded wires 22, which are each connected to the two coil wires 19 via a soldering point 21,
characterized by that the first area 12 of the respective contour of the centering membrane 10 opens in the direction of the upper end 16 of the voice coil bobbin 13 and that the respective soldering points 21 are at least partially embedded in the adhesive seam 26. Voice coil assembly according to claim 1,
characterized, that a membrane 28 is provided, which is provided with a neck 29, and that the neck 29 of the membrane 28 is connected to the upper end 16 of the voice coil bobbin 13. Voice coil assembly according to claim 2,
characterized, that the inner diameter of the neck 29 is substantially equal to the outer diameter of the voice coil bobbin 13 and that the neck 29 of the membrane 28 is at least partially immersed in the adhesive seam 26 present between the first region 12 and the voice coil bobbin 13. Voice coil assembly according to claim 2,
characterized, that the outer diameter of the neck 29 is less than / equal to the inner diameter of the voice coil bobbin 13 and that the neck 29 is inserted and connected in the inner diameter of the voice coil bobbin 13. Voice coil assembly according to claim 4,
characterized, that the neck 29 and the adhesive seam 26 have substantially the same axial distance from the voice coil 18. Voice coil arrangement according to one of Claims 1 to 5,
characterized, that the first region 12 of the respective contour of the centering membrane 10 is provided on its edge 24 closest to the voice coil bobbin 13 with a sealing lip 12 'which, when connected to the voice coil bobbin 13, extends essentially at right angles to the latter. Method of manufacturing according to one of claims 1-6,
characterized, that in a first step the voice coil 18 is connected to the voice coil former 13 and the coil wires 19 are connected to the strands 22 via the soldering points 21, that in a second step the centering membrane 10 is then pushed over the voice coil 18 onto the voice coil carrier 13 from the lower end 16 'of the voice coil carrier 13, that afterwards in a third step the adhesive seam 26 between the voice coil bobbin 13th and the first region 12 of the contour of the centering membrane 10 is formed and that in a last step the membrane 28 is connected to the voice coil bobbin 13. Method for producing an arrangement according to one of claims 1-6,
characterized, that in a first step the voice coil 18 is connected to the voice coil former 13 and the coil wires 19 are connected to the strands 22 via the soldering points 21, that before or after execution of step one, an adhesive seam 26 is attached to the voice coil former 13 in a second step, that then in a third step from the lower end 16 'of the voice coil bobbin 13 from the centering membrane 10 is pushed over the voice coil 18 on the voice coil bobbin 13, and that in a last step the membrane 28 is connected to the voice coil bobbin 13. Method according to claim 7 or 8,
characterized, that before or after pushing the centering membrane 10 onto the voice coil bobbin 13, the strands 22 above the upper end 16 of the voice coil bobbin 13 are fixed and pulled tight, so that the coil wires 19, the soldering points 21 and the wires 22 lie closely against the voice coil bobbin 13, Method according to claim 7 or 8,
characterized, that after execution of the last step and before the adhesive seam 26 has hardened, the strands 22 are guided in an essentially arcuate manner over the surface 27 of the centering membrane 10 facing away from the voice coil 18.

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