JP3499485B2 - Speaker suspension and speaker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker suspension and a speaker using the suspension.

[0002]

2. Description of the Related Art In order to reduce the number of speaker wiring steps,
Conventionally, various conductive suspensions have been proposed in which a conductor is attached so as to follow the corrugated corrugation corrugations formed in the suspension portion. However, these conductive suspensions are generally impractical.

At present, as a material that can be put to practical use, a flat knitted tinsel wire is adopted, and the flat knitted tinsel wire is sewn to a base cloth made of a woven fabric or the like. A conductive suspension formed by hot pressing a cloth is known (Japanese Patent No. 2671140). It is well known that the conductive suspension disclosed in Japanese Patent No. 2671140 has already been mass-produced and put into practical use.

Further, by applying the technique of such a conductive suspension, a conductive edge mounted on the outer peripheral portion of the diaphragm of the speaker and having a conductor attached to the corrugation of the suspension portion generally called an edge is also proposed. It is also well known that (Actual Kaihei 4-36399). Moreover, a repulsive flat speaker using this conductive edge has already been proposed (Japanese Patent Laid-Open No. 6-284499).

As a main conventional example, a repulsive flat speaker using such a conductive edge, in particular, a repulsive flat speaker for large input whose performance is doubled from the previous 40 W specification to 80 W specification is mainly used. This will be described below.

The basic structure of the diaphragm 3 of the speaker is shown in FIG.
As shown in (a) and (b), it has a sandwich structure in which a core material 3C made of rigid urethane foam is sandwiched between skin materials 3S1 and 3S2 from above and below. Skin material 3S1,
3S2 is a voice coil outer peripheral portion 41 of the voice coil 4.
Directly bonded (see FIGS. 7 and 8) to a very important thermal circuit component. Therefore, in order to improve the heat conduction efficiency, the skin materials 3S1 and 3S2 have a thickness of 0.2 mm.
The aluminum plate is press-molded, and the outer peripheral portion is trimmed to have a predetermined outer dimension.

At the central portions of such skin materials 3S1 and 3S2, a recess 3SD having a depth of 2.2 mm and a diameter of 36 mm is provided. Note that FIG. 6A shows the core material 3
It shows a state before C is sandwiched between skin materials 3S1 and 3S2.

The bottom of the recess 3SD of each of the skin materials 3S1 and 3S2 is a flat surface, and a rising portion 12 that is inclined by 30 degrees from the outer periphery of each recess 3SD is provided. Core material 3C with skin materials 3S1 and 3S2
When sandwiched and bonded, a cross-sectional shape as shown in FIG.

Further, in order to mount the concave portion 3SD on the voice coil 4, as shown in FIG. 6 (c),
By punching with a press, a hole Mo having a diameter of 34.3 mm is bored, and the unnecessary portion U is cut off. As a result, a flat portion H1 having a width of 0.85 mm is formed on the outer peripheral side of the hole Mo (for details, see the local portion of FIG. 6D). (See the enlarged view of X1). In this way, the diaphragm 3
Is formed.

Further, as shown in FIG. 6D, a conductive edge 1E, which will be described later, is attached to the outer peripheral portion of the diaphragm 3. Then, the voice coil 4 is attached to the diaphragm 3 in the procedure as shown in FIG.

The voice coil 4 is made of a coil wire material having a conductor diameter of 0.28 mm, which is coated with an insulating layer and then coated with heat resistant varnish (commonly called SV varnish). 30mm, winding width about 12
The coil has a so-called para-winding structure in which two coil wire materials are wound in parallel at the same time, and each coil has a DC resistance of about 3.2Ω. The difference between this voice coil 4 and a general voice coil for speakers is
A bobbinless structure is used for the purpose of improving magnetic efficiency and reducing the weight of the vibration system.

When the diaphragm 3 is attached to the voice coil 4, as shown in FIG. 7, an assembly jig J is used, and after the voice coil 4 is inserted into the coil installation portion J1 of the jig J,
By inserting the voice coil mounting hole Mo of the diaphragm 3 into the voice coil outer peripheral portion 41, the diaphragm 3 and the voice coil 4 are set at regular positions. That is, as shown in FIG. 7, the voice coil 4 is placed on the center line of the diaphragm 3 in the thickness direction.
The upper and lower ends of the voice coil 4 at the position where the center lines in the winding width direction of the sheet are overlapped with each other
They are arranged at equal distances from the surfaces of 1,3S2.

The connecting portion between the voice coil 4 and the diaphragm 3 will be described with reference to the enlarged sectional view of the local portion X2 in FIG.
The flat portion H1 of the skin materials 3S1 and 3S2 is in contact with the substantially central portion in the vertical direction of the voice coil outer peripheral portion 41. Then, the voice coil outer peripheral portion 41, the flat portion H1 of the diaphragm 3 and the obliquely rising portion 12 form a groove V in the voice coil outer peripheral portion 41 over the entire circumference.

As a matter of course, the groove portion V has a flat portion H1.
Since it is divided into upper and lower parts, it is also formed on the back surface side of the diaphragm 3. That is, as can be seen from the enlarged cross-sectional view of the local portion X2 in FIG. 7, the groove V is provided at the upper and lower portions, and in such an assembled state, the groove V and the voice coil outer peripheral portion 41 are provided near the upper end. Acrylic adhesive G (about 0.38 g) is uniformly applied, and the coil cap 5 is attached.

The coil cap 5 has a plate thickness of 0.2 mm.
Is an aluminum plate press-formed into a substantially cylindrical shape with a flange. The inner diameter of the tubular portion 5a is a dimension (34.3 mm) that can be inserted into the voice coil outer peripheral portion 41, and the height of the tubular portion 5a is approximately. It is 4 mm.

Further, as shown in the sectional view (represented by K), one end of the tubular portion 5a is bent to the inner diameter side, and the other end is bent to the outside. There is. Thus, the cylindrical portion 5a has flange portions at both ends, one flange (hereinafter, referred to as an inner flange 5b) has an inner diameter of 31.5 mm, and the other flange (hereinafter,
The outer diameter of the outer flange 5c) is 44.1 mm. A slit SL is provided by linearly cutting the inner flange 5b, the outer flange 5c, and the tubular portion 5a of the coil cap 5 for the purpose of preventing the counter electromotive force from being generated when the voice coil 4 is in operation.

When the cylindrical portion 5a of the coil cap 5 is inserted into the voice coil outer peripheral portion 41 and pushed down until the outer flange 5c contacts the flat surface portion 3SF of the diaphragm 3 (skin material 3S), the voice coil 4 is pressed. 7, the inner flange 5b, the voice coil outer peripheral portion 41, the inner wall of the tubular portion 5a of the coil cap 5, and the groove V shown in the enlarged partial view X2 of FIG. 7 are filled with the adhesive G. Further, the bottom surface portion of the outer flange 5c and the surface flat portion 3S of the skin material 3S1.
The adhesive G wraps around the contact portion of F, and the adhesive G evenly protrudes on the surface of the skin material 3S1 and the slant portion provided on the outer flange 5c. FIG. 8 (a) shows the situation.

In this state, the adhesive G
Is cured and the voice coil 4, the coil cap 5, and the skin material 3S1 (vibration plate 3) are adhered and fixed to each other. Then, after the diaphragm 3 is attached to the voice coil 4 in this manner, it is once removed from the assembly jig J, turned over, and set again in the assembly jig J.

After that, the adhesive G is applied to each part on the back side as well as the front side.
Is evenly applied, the coil cap 5 is attached, the adhesive G is cured, and then the assembly is removed from the assembly jig J. As shown in FIG. 8B, the voice coil 4, the coil cap 5, and the diaphragm 3 are bonded. Be combined. The state of FIG. 8B will be referred to as a vibration system component 40. The enlarged view of the local portion X3 in FIG. 8B shows in detail the state in which the voice coil 4, the coil cap 5, and the diaphragm 3 are adhesively bonded.

By using such a vibration system component 40, a repulsive flat speaker having a repulsive magnetic circuit RM as shown in FIG. 9 is obtained. That is, two magnets RM1 and RM2 magnetized perpendicularly to the thickness direction of a disc shape or a ring shape (a ring shape in the example of FIG. 9) are used, and the same poles of these two magnets RM1 and RM2 ( In this case, N
The electrodes are arranged so as to face each other and repel each other, and the plate RM3 made of a soft magnetic material is sandwiched between the same polar surfaces (see an enlarged view of the local portion X4 in FIG. 9). Then, the repulsive magnetic field is induced in the plate RM3, and the magnetic field is formed in the outer peripheral portion of the plate RM3 by causing the magnetic field to flow in the outer peripheral direction of the plate RM3. Furthermore, the plate RM3
The voice coil 4 described above is arranged with a certain clearance on the outer peripheral portion of the.

Next, the above-mentioned conductive edge 1E will be described.

This conductive edge 1E has a hollow disk shape, and its cross-sectional shape is as shown in FIGS. A flat portion H2 having an inner diameter of 94 mm and extending from the inner diameter toward the center of the hollow portion by about 4 mm is provided, and the flat portion H2 is a bonding margin portion with the outer peripheral portion of the diaphragm 3. The outline of the cross-sectional shape will be described with reference to FIG.
A corrugation 11 having a concentric corrugated shape is formed subsequent to the bonding margin portion (flat portion H2).
The pitch of the corrugations 11 is 6 mm, and the height and depth of the corrugations 11 are 2.2 from the center line L0.
At 5 mm, the top and bottom of corrugation 11 are tied with a radius of about 2 mm.

A manufacturing process of such a conductive edge 1E will be described with reference to FIGS. The edge base material that constitutes the conductive edge 1E is, for example, a warp yarn and a weft yarn, for example, using a 16-count, single-stranded polyester and cotton mixed yarn, with a weaving density of 55 yarns / inch in the warp and 50 yarns / inch in the weft. Weaving, a cotton cloth with a weight of 100 g to 110 g / M ² is obtained. This cotton cloth was impregnated with a resin solution having a phenol concentration of 24%, and a solution obtained by mixing a synthetic rubber such as NBR or SBR was coated on one side to form a rubber coat, and the woven fabric coated with the rubber coat was formed. After being dried with warm air, the rubber-coated woven cloth is cut into a predetermined width with a slitter to obtain a rubber-coated edge base cloth B which is generally used.

Such a rubber-coated edge base fabric B has
Two flat knitted tinsel cords 2 for supplying power to the voice coil 4 are mounted on the rubber coated surface Ba side. This flat knitted tinsel thread 2 is sewn to the rubber coated edge base cloth B with a thread 2w called Conex # 40 as shown in the enlarged view of the local portion X5 in FIG. 10 (a).

The two flat knitted tinsel wires 2 are shown in FIG.
As can be seen from (a), the distance d (d
= About 15 mm), a line Q1, parallel to the center line Q0
It is sewn on Q2 (pitch of lines Q1 and Q2 is about 30 mm). The flat braided tinsel wire 2 is a cadmium (Cd) alloy copper wire having a bus diameter of 0.1 mm, a width of 0.3 mm, and a thickness of 0.
It is processed into a 02 mm foil, and it is made into a tinsel wire by winding it in one layer around 40 ± 2 turns of meta-aramid fiber with about 40 ± 4 turns / cm. It is a knit.

The rubber-coated edge base fabric B sewn with the flat knitted tinsel wire 2 is thermocompression-molded. The temperature of the mold for thermocompression molding is about 200 ° C., the pressure is about 600 Kg (axial output), and the pressing time is Is about 5 seconds, which is no different from the general edge molding method. After the hot-pressing step, the phenol resin or the like impregnated in the rubber-coated edge base cloth B is cured, and the corrugation 11 having a predetermined shape is molded at a predetermined position of the rubber-coated edge base cloth B. After molding, when the molded product of the rubber-coated edge base fabric B with the flat knitting tinsel wire 2 is taken out from the molding die, as shown in FIG. 10 (b), the two flat knitting tinsel wires 2 have corrugation 11 corrugations. It will be in a state along the unevenness of.

The rubber coated edge base cloth B having the two flat knitting tinsel cords 2 as shown in FIG. 10 (b) mounted at predetermined positions is transferred to the trimming step. And first, FIG.
By cutting along the broken line portion Z1 on the inner side and the broken line portion Z2 on the outer side of (a), unnecessary portions of the inner side portion and the outer side portion are cut off to complete the conductive edge 1E as shown in FIG. 11 (b). At this time, a punching die for trimming was prepared in advance, and the rubber-coated edge base fabric B with the two flat knitting tinsel cords 2 shown in FIG. Then, an unnecessary portion is cut off by performing a press work to obtain a desired conductive edge 1E as shown in FIG. 11 (b).

By joining such a conductive edge 1E to the outer peripheral portion of the vibration plate 3, as described above, the vibration system component 40 including the voice coil 4 and the like is formed.
The sectional shape is shown in FIGS. 6 to 9.

Further, the flat knitted tinsel wire 2 extended to the inner peripheral side (voice coil 4 side) of the conductive edge 1E is provided on the surface of the surface skin material 3S1 of the diaphragm 3 via the rubber coated edge base cloth B. The extended front end portion of the flat knitted tinsel wire 2 that is bonded is arranged at a predetermined position near the outer peripheral portion 41 of the voice coil. Then, the extending front end portion of the flat knitted tinsel wire 2 extended to the voice coil outer peripheral portion 41 side is wire-bonded to the end portion (not shown) of the power supply line of the voice coil 4 by soldering. , The soldered portion is covered with a reinforcing adhesive.

On the other hand, the end portion of the flat knitted tinsel wire 2 on the outer peripheral side of the conductive edge 1E has the diaphragm 3 mounted on the voice coil 4.
After being mounted at a predetermined position of the speaker frame F as shown in FIG. 9, it is connected and wired with a power supply terminal lug (not shown). That is, when the outer peripheral portion of the conductive edge 1E is attached to the flange portion of the speaker frame F by adhesion and then the power supply terminal lug is attached to the flange portion of the speaker frame F with a screw or the like, the power supply Connection wiring is formed by pressing a part of the terminal lug against the end of the flat knitted tinsel wire 2.

The speaker in such a state has a voice coil outer peripheral portion 4 protruding from the diaphragm 3.
1, that is, the coil cap 5 is attached to the voice coil outer peripheral portion 41 exposed in the atmosphere having poor thermal conductivity. As a result, the heat dissipation efficiency of the voice coil 4 is remarkably improved, and the input withstand performance (40
Even if a signal more than twice (80 W or more) compared to W) is input, the temperature rise of the voice coil 4 can be suppressed within the heat resistant temperature (about 250 ° C. to 270 ° C.) of the voice coil 4, and This is a repulsive flat speaker that operates normally without any breaks in the coil wire.

[0032]

However, when an input signal of 80 W is continuously applied to such a repulsive flat speaker,
After about 32 to 40 hours have passed, the voice coil 4 itself maintains a normal state sufficient to drive the speaker, but the flat knitted tinsel cord 2 attached to the conductive edge 1E thereof.
It has been confirmed that cracks may occur in the copper foil of the tinsel wire constituting the above, and the flat knitting tinsel wire 2 may eventually be broken, resulting in an inoperable state.

Further, as a result of analyzing and investigating the speaker continuously applied for a long time, it was confirmed that cracks were generated at several places of the copper foil constituting the flat knitted tinsel wire 2 that was mounted, and then the speaker having the cracks was further heated to 80 W. It was confirmed that the pseudo disconnection occurred within a few hours to 12 hours after continuously applying the input signal. It can be easily imagined from experience that the wire will break after a few hours when it becomes a pseudo wire break, and further improvements have been demanded.

Observing the above-mentioned conventional repulsive flat speaker, first, the flat knitted tinsel wire 2 was attached to the rubber coated surface Ba of the rubber coated edge base fabric B. That is, as described in FIG. 10, the rubber coated edge base fabric B
A rubber coat is applied to one of the surfaces, and the flat knitted tinsel cord 2 is attached to the rubber-coated surface (rubber-coated surface Ba) side. Therefore, when the crack occurrence point of the copper foil forming the flat knitting tinsel wire 2 attached to the conductive edge 1E is investigated, as shown in FIG. The surface of the braided thread 2 was discolored to be dark black (this discolored portion is indicated by T).

Further, as shown in FIG. 12 (b), the thread 2w sewing the flat knitting tinsel wire 2 is cut, and the attached plain knitting tinsel wire 2 is removed from the corrugation 11 to make it fine. As a result of observation, as shown in the enlarged view of the local X7,
A place where the rubber coat is deleted on the rubber coat surface Ba (hereinafter referred to as a coat deletion part RG) was found.

As a result of proceeding with the verification, this coat deletion portion RG
It was confirmed that the copper foil cracks on the flat knitted tinsel wire 2 coincided with each other, and further, the portion T of the flat knitted tinsel wire 2 which was discolored in black was wiped with a cloth soaked with a solvent such as toluene. It was confirmed that the discolored portion T returned to a normal surface state and black stains adhered to the cloth side.

From the above phenomenon, when the diaphragm 3 continuously moves with a large amplitude, the corrugation 11 forming the conductive edge 1E is also deformed following, and as a matter of course, the flat knitted tinsel wire 2 also moves. Therefore, a frictional force is generated at the contact portion between the flat knitted tinsel cord 2 and the rubber coated surface Ba of the corrugation 11 during the movement. Generally, it is known that rubber has a large frictional force, and it is speculated that the frictional force is a factor causing cracks in the copper foil.

Since the copper foil itself constituting the flat knitted tinsel wire 2 is very thin, it is flexible against bending and has a structure in which the copper foil is wound around the core yarn, so that the plain weave tinsel wire 2 is extremely excellent. It is well known that the conductive wire has excellent bending resistance. This flat knitted tinsel wire 2 further has high bending resistance because the copper foil moves when the plain weave tinsel wire 2 is flexed to disperse the deformation force applied to the copper foil. Is listed as.

The above-mentioned movability of the copper foil is limited by the friction of the mounting surface, that is, the friction with the rubber coated surface Ba, and a crack is generated in the copper foil so that the breaking point of the crack scrapes off the rubber coated surface Ba. It is not clear whether the foil itself scraped off the rubber coated surface Ba from the beginning, but in any case, the scraped off fine rubber residue was the surface of the flat knitted tinsel wire 2,
That is, it was concluded that they were attached to the surface of the copper foil.

In order to deal with such a problem, FIG.
A conductive edge 1E as shown in (1) was created. In this conductive edge 1E, a flat knitted tinsel wire 2 is attached to the back side of a base fabric for an edge (which is represented by B1) which is not subjected to rubber coating, and its surface (the surface on which the flat knitted tinsel wire 2 is attached) A surface of the opposite side B11 is coated with a dumping agent DP as a braking agent for controlling vibration.

This conductive edge 1E is an edge base cloth B1.
By omitting the rubber coat, the weight corresponding to the rubber coat at the conductive edge 1E is not added. Therefore,
Even if the dumping agent DP is applied, the applied weight of the dumping agent DP and the weight of the rubber coat are substantially offset, so that the vibration system component 4
Since the weight does not increase at 0, the sound pressure level is not lowered, and the compliance component of the rubber coat is subtracted, so the desired minimum resonance frequency is maintained,
Although it seemed to meet the design performance, the following drawbacks were found.

Explaining below, when the dumping agent DP is applied to the entire surface of the corrugation 11 not coated with rubber (the surface B11 opposite to the surface on which the flat knitting tinsel wire 2 is mounted), the dumping agent DP is applied to the edge base cloth. Although it oozes out to the opposite side through the eyes of the woven cloth of B1, naturally, the oozing dumping agent DP adheres to the flat knitting tinsel cord 2 attached to the back side of the edge base cloth B1. Particularly, in the corrugation valley portion Va on the side where the dumping agent DP is applied, the applied dumping agent DP is accumulated in the valley portion Va due to its own weight, so that the local X8 of FIG. 13 is finally obtained.
As shown in the enlarged cross-sectional view of FIG. 2, the back surface of the valley portion Va, that is, the mountain portion Mt of the surface on which the flat knitting tinsel wire 2 is mounted oozes out and the dumping agent DP covers the flat knitting tinsel wire 2. There are also places that fall into this state.

The reason why the flat knitted tinsel wire 2 is a conductive wire having extremely excellent bending resistance is that the copper foil itself is flexible against bending, and the copper foil wound around the core yarn is movable. As described above, the deformation force applied to the copper foil is dispersed. However, as shown in FIG. 13, when the dumping agent DP oozing out from the texture of the edge base fabric B1 adheres to the flat knitting tinsel wire 2, it naturally adheres to the copper foil forming the flat knitting tinsel wire 2. , Copper foil is the edge base fabric B1
The copper foil (flat knitted tinsel wire 2) is impaired in its flexibility and movability.

As a result, the flat knitted tinsel wire 2 attached to the corrugation 11 may be broken at an early stage, resulting in a speaker with degraded performance. Specifically, for example, when it is assumed that there is a speaker capable of maintaining the basic performance without disconnection for at least 100 hours in the state where the input signal of 80 W is continuously applied, the specification as shown in FIG. It is feared that the flat knitted tinsel wire 2 will be broken before 100 hours have passed.

As a countermeasure for preventing the dumping agent D from adhering to the flat knitted tinsel cord 2, the dumping agent DP is removed from the texture of the woven cloth.
Is applied by a method of applying the dumping agent DP several times with a coating amount that does not bleed out (application method generally called overcoating), the dumping agent DP is dried, and the texture of the edge base fabric B1 is applied. It is also conceivable to apply an amount of the dumping agent DP suitable for braking the conductive edge 1E after sealing (stopping) the.

However, as a matter of course, this method inevitably increases the number of times the dumping agent DP is applied.
Moreover, each time the dump agent DP is applied, the dump agent D
Since the drying time of P is also required, the number of steps in the coating process is significantly increased, and as a result, the manufacturing cost is increased, which is not a realistic manufacturing method.

Therefore, the present invention intends to further improve the performance and reliability of the conventional repulsive flat speaker by devising the method of attaching the flat knitted tinsel wire to be attached to the conductive edge and the method of applying the dumping agent. 8 possible as concrete results
With an input signal of 0 W continuously applied, at least 15
It is an object of the present invention to provide a speaker suspension structure and a speaker capable of maintaining basic performance without being disconnected for 0 hours or more.

[0048]

In order to achieve the above-mentioned object, the speaker conductive suspension structure of the present invention is formed with corrugations having a concentric corrugated shape, and the corrugations are formed in a direction transverse to and across the corrugations. In a speaker suspension having a hollow disk-shaped conductive suspension in which a flat knitting thread wire for power supply to a voice coil is mounted along a waveform unevenness, the conductive suspension is intended for air leakage or damping adjustment. Has a surface coated with a coating material having a large friction coefficient on one of the surfaces, and the surface opposite to the surface coated with the coating material, that is, the surface not coated with the coating material. I am trying to attach the flat knitting thread to the.

Then, it is preferable to apply a braking agent for controlling the vibration of the corrugation to the surface of the coating material coated with the coating material.

Further, it is preferable to apply a predetermined amount of this braking agent only to the corrugated corrugated concave portions.

Further, the speaker of the present invention uses two magnets which are magnetized perpendicularly to the thickness direction of a disk or ring shape, and the two magnets of the same pole face each other to repel each other. , And a plate made of a soft magnetic material is sandwiched between the homopolar surfaces, the repulsive magnetism is induced in the plate by the facing of the homopolar members, and the magnetism is directed in the outer peripheral direction of the plate. It has a magnetic circuit that allows it to flow and generate a constant magnetic flux on the outer side of the plate. Furthermore, a voice coil is arranged on the outer peripheral part of the plate with a certain clearance to the plate, and a flat plate shape is formed on the outer peripheral part of this voice coil The following suspension is adopted as the speaker suspension in the speaker in which the diaphragm having the above is mounted.

That is, a corrugation having a concentric corrugated shape is formed, and a flat knitting tinsel wire for supplying power to the voice coil is mounted in a direction traversing the corrugation and along the corrugation corrugations. In a speaker suspension having a hollow disk-shaped conductive edge, the conductive suspension has a coated surface made of a material with a large friction coefficient for the purpose of adjusting air leakage or damping on either surface. Then, the surface opposite to the surface coated with this coating agent,
That is, the flat knitting tinsel wire is attached to the surface not coated with the coating material.

Then, a braking agent for controlling the vibration of the corrugation is applied to the surface of the coating agent coated with the coating agent, or a predetermined amount of this braking agent is applied only to the corrugated corrugated recesses. I am trying to do it.

[0054]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention.
5 will be explained, but before explaining the gist of the present invention,
First, a repulsive flat speaker to which the present invention is applied will be described. This repulsive flat speaker uses a so-called single suspension conductive edge in which a flat knitting tinsel wire is attached to a corrugation. This conductive edge
Unlike the type described in the conventional example (FIGS. 6 to 13), the method of mounting the flat knitting tinsel wire is characteristic. First, the conductive edge of the repulsive flat speaker to which the present invention is applied will be described, and then the gist of the present invention will be described.

Conductive edge 1E shown in this embodiment
Since many parts are the same as the repulsive flat speaker using the conventional conductive edge 1E described in FIGS. 6 to 13 (hereinafter simply referred to as a conventional example), common parts are denoted by reference numerals in FIGS.
It is the same as FIG. The conductive edge 1E shown in this embodiment is the plain weave tinsel wire 2 to the conductive edge 1E.
Other than how to attach the conductive edge 1E and the flat knitted tinsel wire 2
Most of the conventional examples (Fig. 6-
12).

FIG. 1 shows a conductive edge 1 to which the present invention is applied.
It is a figure explaining about E, but it is basically manufactured by the same procedure as described in FIG. 10 and FIG. 11 which are conventional examples. As shown in FIG. 1 (a), a rubber-coated edge base cloth B similar to the conventional one is attached to a plain knitting tinsel wire 2 (17
Sew this set in parallel with the same position as before. Further, the flat knitted tinsel thread 2 is sewn on the rubber coated edge base fabric B.
Is hot-pressed as in the conventional example.

Corrugation 11 by the hot press molding
After being molded, the two flat knitted tinsel cords 2 attached at predetermined positions and along the corrugations 11 are transferred to the trimming step and cut at the inner broken line portion Z1 and the outer broken line portion Z2. By this cutting, unnecessary portions of the inner side portion and the outer side portion are cut off to complete the conductive edge 1E as shown in FIG. 1 (b).

Thus, although it is basically the same as the conventional example, the way of mounting the flat knitting tinsel cord 2 is different, and this will be described below.

FIG. 2A shows the same state as FIG. 1B, that is, the unnecessary portion is cut off to complete the conductive edge 1E. The local portion X9 of FIG. 2A is enlarged. As shown in the perspective view (FIG. 2B), the height and depth of the irregularities of the corrugation 11 at the position where the flat knitting tinsel wire 2 is mounted are increased.

That is, the line Q0 passing through the center of the conductive edge 1E is used as the center, and the line Q0 is spaced apart from the line Q0 at symmetrical positions on both sides thereof.
Lines Q1 and Q parallel to line Q0 with (d = about 15 mm)
A corrugation larger than the conventional corrugation 11 (referred to as a large corrugation portion 11L) is partially provided on 2 (pitch of lines Q1 and Q2 is about 30 mm). The width W of the large corrugated portion 11L is about 7 mm.

In order to make it easy to understand the difference between the large corrugation portion 11L and the conventional corrugation 11 installed at another position (this is referred to as the small corrugation portion 11), the large corrugation portion 11L and the small corrugation portion 1 can be easily understood.
The cross-sectional shape of No. 1 is shown in an overlapping manner in FIG. 2C, which will be described with reference to FIG.

The solid line in FIG. 2 (c) indicates the large corrugation portion 11L, and the broken line indicates the conventional corrugation portion 11 which is the small corrugation portion 1 in the present invention.
It becomes 1. The conductive edge 1E of the present invention also has a hollow disk shape like the conventional example, and the inner diameter of the hollow portion is 9
A flat portion H2 having a diameter of 4 mm and extending from the inner diameter toward the center of the hollow portion and having a length of about 4 mm is provided. The flat portion H2 is a bonding margin portion with the outer peripheral portion of the diaphragm 3. The tension margin portion is similarly provided in the large corrugation portion 11L to which the flat knitting tinsel wire 2 is attached and the small corrugation portion 11 to which the flat knitting tinsel wire 2 is not attached.

Then, the small corrugation portion 1 having a concentric corrugated shape is provided subsequent to the pasting portion (flat portion H2).
1 is formed, and the large corrugation portion 11L is partially (on the lines Q1 and Q2) formed. The pitch of the small corrugation portions 11 is 6 mm, the height and depth of the irregularities of the small corrugation portions 11 are 2.25 mm above and below the center line L0, and the top and bottom portions of the small corrugation portions 11 are the same. Are connected with a radius of about 2 mm. On the other hand, the pitch of the large corrugation portion 11L is 6 m.
m, the height and depth of the unevenness of the large corrugated portion 11L are divided into 3.2 mm above and below the center line L0,
The top and bottom of the large corrugated portion 11L have approximately 1.
It is tied with a radius of 8 mm.

After passing through such a manufacturing process, as a matter of course, the flat knitted tinsel cord 2 becomes a conductive edge 1E attached by sewing along the large corrugated portion 11L. This conductive edge 1E is joined to the diaphragm 3 as in the conventional example, and the end portion of the flat knitted tinsel wire 2 extending to the voice coil 4 side and the voice coil 4 are wire-bonded by soldering. Similarly, the diaphragm 3 already attached to the voice coil 4 is bonded to a predetermined position of the speaker frame F. Then, the repulsion flat panel speaker as shown in FIG. 3 is completed through a predetermined process such as the connection wiring of the end portion of the flat knitted tinsel wire 2 arranged on the flange portion of the speaker frame F for the input terminal lug.

The basic structure of FIG. 3 is the same as that of FIG. 7, and the same parts are designated by the same reference numerals. Note that FIG.
FIG. 4 is a diagram for explaining the operation of the vibration system (conductive suspension structure) (operation in the full stroke state of the conductive edge 1E) when the repulsive flat speaker of the present invention makes a ringing operation, which will be described below.

When the conductive edge 1E is in the full stroke state in the vertical direction, the vibrating system becomes the state T1 and the state T in FIG.
It becomes like 2. As described above, when the conductive edge 1E is in the full stroke state in the vertical direction, the local X in FIG.
As shown in the enlarged cross-sectional view of 10 (see the upper portion of FIG. 3) and the enlarged cross-sectional view of the local portion X11 in FIG. 3 (see the lower portion of FIG. 3), a state in which the small corrugation portion 11 having a short sectional length is stretched, that is, A large corrugation portion 11 having a long cross-sectional length, which falls into the oblique straight line state (broken line portion) shown in each enlarged view of FIG.
It becomes possible for L to keep a form with a margin. As a result, the flat knitted tinsel cord 2 to which the flat knitted tinsel cord 2 is attached is hardly stretched along the surface of the large corrugated portion 11L.

As described above, even if the suspension structure of the speaker is a single suspension, even if the conductive edge 1E falls into a full stroke state, the small corrugation portion 11 inevitably exhibits the stopper function and the large corrugation portion. It is possible to prevent the flat knitted tinsel cord 2 mounted on 11L from being stretched. That is, the conductive edge 1E itself has a structure in which a fail-safe function is added, and even if the repulsive flat speaker of the structure of the present invention is actually continuously applied with an input signal of 80 W for 100 hours, it is attached to the conductive edge 1E. The flat knitted tinsel wire 2 can maintain the basic performance without breaking and can secure desired performance.

By the way, the repulsive flat speaker adopting the conductive edge 1E of the present invention as described with reference to FIGS. 1 to 3 has a higher performance than the conventional repulsive flat speaker (see FIGS. 6 to 12). Although it can be made excellent, it can be made even more excellent by adding the following improvements thereto. This will be explained below.

That is, as already described in the section of the problem to be solved by the above-mentioned invention, the repulsive flat speaker of FIGS. 1 to 3 to which the input signal is continuously applied for 100 hours is analyzed and investigated. From the above, it was confirmed that even in the repulsive flat panel speaker of FIG. Then, when an input signal of 80 W is further continuously applied to the cracked speaker,
It was confirmed that the pseudo wire breakage occurred within 12 hours after several hours. Such a phenomenon is as described with reference to FIG. In addition, in the case of the conductive edge 1E shown in FIGS. 1 to 3, the coat removing portion R shown in FIG. 12 is provided in the contact portion between the large corrugation portion 11L and the flat knitting tinsel wire 2.
G (not shown here) occurred.

The present invention is intended to solve such a problem as well. Here, the conductive edge 1E described in this embodiment (the conductive edge having the large corrugation portion 11L and the small corrugation portion 11 and the plain weave tinsel wire 2 attached to the large corrugation portion 11L) will be described as an example. . However, it goes without saying that the method described below can also be applied to a conventional conductive edge (for example, the conductive edge 1E described in FIGS. 6 to 12) that does not have the large corrugated portion 11L.

As a means for solving the problems caused by such cracking, it was judged effective to reduce the coefficient of friction so that the copper foil could move more easily. When 2 is attached to the rubber-coated edge base fabric B, as shown in FIG. 4, it is attached by sewing to the surface (non-coated surface Bb) opposite to the surface on which the rubber coating RC is applied. The non-coated surface Bb has a much lower friction coefficient than the surface of the rubber coated RC (rubber coated surface Ba). The detailed structure is shown in the enlarged cross-sectional view of the local portion X12 in FIG.

That is, the two flat knitted tinsel cords 2 are not mounted on the rubber-coated surface Ba side of the large corrugated portion 11L, but on the surface (uncoated surface Bb) opposite to the surface Ba coated with the rubber coat RC. ) Is installed. Therefore, in the manufacturing process of the conductive edge 1E, when the hot press molding is performed and the small corrugation portion 11 and the large corrugation portion 11L are molded, the two flat knitting tinsel cords 2 are opposite to those shown in FIG. It is attached in a state along the large corrugation portion 11L on the side (non-coated surface Bb) side.

Further, when the conductive edge 1E has a large amplitude, as a means for reducing the excessive deformation and the frictional force extending to the flat knitting tinsel wire 2, the corrugation 11 (in this case,
Small corrugation unit 11 and large corrugation unit 11
It is assumed that the dumping agent DP is applied to the entire rubber-coated surface Ba (made of L). The dumping agent DP used here is a water-soluble emulsion type that has been generally used conventionally.

It is well known that when the edge of the speaker (conductive edge 1E) has a large amplitude, a local deformation such as a dimple shape occurs on the edge, or the edge resonates at a specific frequency to perform a deformation operation. As a method of preventing such local deformation and resonance, that is, abrupt strain deformation operation of the edge, a damping agent generally called a dumping agent DP is applied to the edge corrugation 11.
It is also well known that damping (damping) the strain deformation operation is a conventional conventional means.

Therefore, when the dumping agent DP is applied to the rubber-coated surface Ba of the conductive edge 1E, it is possible to prevent a sudden strain deformation operation of the corrugation 11 of the conductive edge 1E at a large amplitude. Further, the effect extends to the flat knitted tinsel wire 2 attached to the corrugation 11 (large corrugation portion 11L), and naturally, also to the copper foil forming the flat knitted tinsel wire 2. That is, the effect of suppressing abrupt and excessive deformation of the copper foil is obtained, and the occurrence of cracks is prevented. Moreover, since the effect of suppressing excessive deformation is also involved in the effect of weakening the frictional force between the copper foil and the contact portion of the corrugation 11, the effect can be expected to be doubled in the prevention of cracks.

By the first method as described with reference to FIG. 4, the effect of preventing the occurrence of cracks in the copper foil forming the flat knitting tinsel wire 2 can be obtained, but the corrugation 11 (the small corrugation portion 11 and the large corrugation portion 11 are large). Since the dumping agent DP is applied to the entire surface of the corrugation portion 11L, there is a problem that the braking effect becomes too large and the weight of the dumping agent D increases.

A second method for further improving this will be described with reference to FIG. The basic configuration of FIG. 5 is the same as that of FIG. That is, the flat knitted tinsel wire 2 is connected to the large corrugation portion 1
It is not attached to the rubber coated surface Ba side of 1L, but is attached to the surface (non-coated surface Bb) opposite to the surface provided with the rubber coated surface Ba. Therefore, when the small corrugation portion 11 and the large corrugation portion 11L are formed by hot-press molding, the two flat knitted tinsel wires 2 are on the side opposite to that shown in FIG. 1 (non-coated surface Bb). It is attached along the large corrugation portion 11L.

As described above, the basic structure is the same as that of FIG. 4, but in the case of FIG. 5, the method of applying the dumping agent DP is different. This point will be described below.

As shown in the enlarged cross-sectional view of the local portion X13 of FIG. 5, the corrugation 1 on the opposite side of the conductive edge 1E on which the flat knitted tinsel wire 2 is mounted, that is, on the rubber coated surface Ba side.
The dumping agent DP is applied only to the respective valley portions Va of 1 (small corrugation portion 11 and large corrugation portion 11L). As the dumping agent DP, as in FIG. 4, a water-soluble emulsion type that has been generally used conventionally is used.

By attaching such a conductive edge 1E to the vibration system component 40, and assembling and mounting the vibrometer component 40 having the conductive edge 1E attached to the speaker frame F together with the repulsion magnetic circuit RM and the like, as shown in FIG. A repulsive flat speaker similar to that shown in can be manufactured.

As described above, the flat knitted tinsel cord 2 is formed even when the input signal is continuously applied to the repulsive flat speaker of FIGS. 1 to 5 produced by the first method or the second method, for a long time. No cracks were found on the copper foil. Specifically, in the repulsive flat speaker having the conductive edge 1E of the present invention produced by the first method or the second method,
Even if the input signal of 0 W is continuously applied for 150 hours or more, the flat knitted tinsel wire 2 attached to the conductive edge 1E can achieve the intended purpose while maintaining the basic performance such as sound pressure. It has become possible. Further, the state of the flat knitted tinsel wire 2 attached to the conductive edge 1E was examined, and it was found that no crack was found in the copper foil forming the flat knitted tinsel wire 2.

Further, in this embodiment, the dumping agent DP
Since it is applied to the rubber coated surface Ba, the dump agent DP does not bleed to the opposite surface, that is, the flat knitting thread line 2 side. The adverse effect on the line 2 can be prevented.

In the above-described embodiment, the corrugation 11 of the conductive edge 1E is the small corrugation portion 11.
The conductive edge 1E having the large corrugated portion 11L has been described as an example. However, as described above, this can be applied to other conductive suspensions as long as the conductive suspension is formed by sewing the flat knitting tinsel wire to the corrugation. Is. For example, the present invention can be applied to a conductive edge having a conductive suspension as shown in FIGS. 6 to 12 described in the section of the related art or a conductive suspension serving as a conductive damper not connected to the diaphragm 3.

[0084]

As described above, according to the present invention,
By attaching the flat knitted tinsel wire to the surface of the corrugation that is not coated with rubber, that is, the non-coated surface, the friction coefficient at the contact part between the copper foil and the corrugation forming the tinsel wire of the flat knitted tinsel wire is improved. It can be made small, and by doing so, it is possible to prevent cracks from occurring in the copper foil portion.

A braking agent (dump agent) is applied to the surface of the corrugation opposite to the surface on which the flat knitted tinsel wire is mounted, that is, the surface on which the rubber coat is applied. In this way, by applying the dumping agent to the corrugation, it is possible to prevent the rapid strain deformation operation of the edge, prevent the rapid strain deformation operation of the corrugation of the conductive edge at the time of a large amplitude, and its effect is corrugation. The flat knitted tinsel wire 2 attached to the flat knitted tinsel wire and the copper foil forming the flat knitted tinsel wire are also covered. In other words, suddenly for copper foil,
In addition, it is possible to prevent excessive deformation and prevent cracks from occurring.

Moreover, since the dumping agent is applied on the surface coated with a coating such as a rubber coat, the dumping agent is on the back side of the corrugation (the surface on which the flat knitting tinsel wire is mounted).
It does not exude to the side, so that the dumping agent (braking agent) can be prevented from adhering to the flat knitting tinsel wire. As a result, the flexibility and movability of the copper foil (flat knitting tinsel wire) are not hindered as in the conventional case, which is extremely effective in preventing the occurrence of copper foil cracks.

Further, the dumping agent is applied in a predetermined amount only to the valley portion of the corrugation on the side opposite to the side on which the flat knitting tinsel wire is mounted, that is, on the side on which the rubber coat or the like is applied. . As a result, the application work is much easier than the application to the entire surface of the corrugation, and it is possible to give the conductive suspension a proper braking effect. As a result, the desired resonance frequency can be maintained without causing an extreme decrease in compliance, and the weight increase due to the application of a braking agent can be within the allowable range. The drawback of pressure drop can be eliminated.

By adopting such a suspension in the repulsive flat speaker, the durability of the flat knitted tinsel wire mounted on the conductive suspension can be greatly improved. As a specific performance, it is possible to maintain the basic performance without disconnection for at least 150 hours in a state where an input signal of 80 W is continuously applied, and it is possible to realize a reliable speaker (repulsive flat speaker).

[Brief description of drawings]

FIG. 1 is a perspective view of a speaker suspension and a conductive edge used in a speaker of the present invention, in which FIG. 3B is a perspective view showing a state where trimming processing is performed after molding.

2 is a perspective view of the conductive edge shown in FIG. 1, (a)
Is a perspective view showing the completed state after trimming processing,
(B) is a local enlarged perspective view showing a large corrugated portion,
(C) is an enlarged sectional view of a conductive edge.

FIG. 3 is a cross-sectional view of a repulsive flat speaker using the conductive edge shown in FIG. 1 and an edge enlarged cross-sectional view showing a full stroke.

4A and 4B are a cross-sectional view and a partially enlarged cross-sectional view showing a structure of a conductive edge according to a first technique of an embodiment of the present invention.

5A and 5B are a cross-sectional view and a partially enlarged cross-sectional view showing a structure of a conductive edge according to a second technique of an embodiment of the present invention.

6A and 6B are views showing a manufacturing process of a diaphragm of a repulsive flat speaker using a conductive edge in a conventional example, a sectional view showing the diaphragm structure and a partially enlarged sectional view.

7A and 7B are a view showing an assembling process of a vibration system component of a repulsive flat speaker using the conductive edge shown in FIG. 6, a sectional view showing an assembled state, and a partially enlarged sectional view.

8A and 8B are diagrams showing a state immediately before and after assembling a vibration system component of the repulsive flat speaker using the conductive edge shown in FIG. 6, and FIG. 8A shows a completed state in a jig.
(B) is a sectional view and a partially enlarged sectional view showing a completed assembly state after being taken out from the jig.

9A and 9B are a cross-sectional view and a partially enlarged cross-sectional view of a repulsive flat speaker using the conductive edge shown in FIG.

10 is a perspective view showing a manufacturing process of the conductive edge shown in FIG. 6, (a) is a perspective view showing a state in which a plain knitting tinsel wire is sewn to a rubber coated edge base fabric, and (b) is a flat knitting fabric. FIG. 3 is a perspective view showing a state in which the base fabric on which the tinsel thread has been sewn is thermocompression molded.

11 is a perspective view showing a manufacturing process of the conductive edge shown in FIG. 6, (a) is a perspective view showing a state immediately before trimming after thermocompression molding, and (b) shows trimming after thermocompression molding. It is a perspective view showing a completed state and a locally enlarged perspective view showing a state in which a flat knitting tinsel wire is attached to a corrugated portion.

FIG. 12 is a view showing a flat knitting tinsel wire disconnection portion in a conventional conductive edge, (a) is a cross-sectional view thereof, and (b) is an enlarged perspective view showing a flat knitting tinsel wire mounting portion and a rubber coat removing portion. It is a local enlarged perspective view showing.

FIG. 13 is a view for explaining a device for solving the problem of the conductive edge in the conventional example, in which (a) is a cross-sectional view showing a structure of the conductive edge and a partially enlarged cross-sectional view. Is.

[Explanation of symbols]

11 Corrugation (small corrugation section) 11L large corrugation department 1E conductive edge (conductive suspension) 1D conductive damper (conductive suspension) 2 flat knitting wire 2w flat knitting thread line sewing thread 3 diaphragm 3C diaphragm core material 3S1,3S2 skin material 3SD skin material recess 3SF skin material flat part 4 voice coils 41 Voice coil periphery 5 coil cap D damper E edge F speaker frame G adhesive RM repulsive magnetic circuit RM1 magnet (for repulsive magnetic circuit) RM2 magnet (for repulsive magnetic circuit) RM3 plate (for repulsive magnetic circuit) W large corrugation width Y York DP dump agent (braking agent) RC rubber coat Ba rubber coated surface Valley of Va Corrugation

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04R 9/02 103 H04R 9/04 103

Claims (4)

(57) [Claims] 1. A corrugation having a concentric corrugation is formed, and a flat knitting tinsel wire for supplying power to a voice coil is mounted in a direction traversing the corrugation and along the corrugations of the corrugation. In a speaker suspension having a hollow disk-shaped conductive suspension, the conductive suspension is coated with a coating material made of a material having a large friction coefficient for the purpose of adjusting air leakage or damping. The speaker suspension characterized in that the flat knitted tinsel wire is mounted on the surface opposite to the surface coated with the coating material, that is, on the surface not coated with the coating material. 2. The speaker suspension according to claim 1, wherein a braking agent for controlling the vibration of the corrugation is applied to the coating agent-coated surface to which the coating agent is applied. 3. The speaker suspension according to claim 2, wherein a predetermined amount of the braking agent is applied only to the corrugated corrugated recesses. 4. A disk-shaped or ring-shaped two magnets magnetized perpendicularly to the thickness direction are used, and the two magnets are arranged so that the same poles of the two magnets face each other and repel each other, and A plate made of a soft magnetic material is sandwiched between the homopolar surfaces, and a repulsive magnetism is induced in the plate by the facing of the homopolar members, and the magnetism is caused to flow in the outer peripheral part of the plate to cause the outer part of the plate. Has a magnetic circuit for generating a constant magnetic flux, and further, a voice coil is arranged on the outer peripheral portion of the plate with a constant clearance with respect to the plate, and a diaphragm having a flat plate shape is formed on the outer peripheral portion of the voice coil. The mounted speaker has the speaker suspension according to any one of claims 1 to 3 between the outer periphery of the diaphragm and the speaker frame. Speaker, characterized in that the.