JP2001177895A - Speaker and suspension structure for the speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a speaker withstanding a high input by preventing an irrational force from being exerted to a conductive member (flat knitting tinsel wire) mounted on a corrugation in a conductive suspension structure. SOLUTION: The corrugation (large corrugation part 11L) having a cross sectional length longer than a cross sectional length of a cross section of the flat knitting tinsel wire 2 of a corrugation 11 provided to a conductive edge 1E is formed at a prescribed position of the conductive edge 1E through integral forming and the flat knitting tinsel wire 2 is mounted in a state along the recessed and projected shape of the large corrugation part 11L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a speaker suspension structure and a speaker employing the suspension structure.

[0002]

2. Description of the Related Art In order to reduce the number of wiring steps for a speaker,
Conventionally, various types of conductive suspensions in which a conductor is mounted along the corrugations of corrugations formed in the suspension portion have been proposed. However, these conductive suspensions are generally not practical.

At present, a flat braided tinsel wire is adopted as a material which can withstand practical use, and the flat braided tinsel wire is attached by sewing to a base cloth made of woven cloth or the like, and the flat braided tinsel wire is mounted. A conductive suspension obtained by hot-pressing the base fabric is known (Japanese Patent No. 2671140). It is well known that the conductive suspension of this patent No. 2671140 has already been mass-produced and fully put into practical use.

[0004] Further, by applying such conductive suspension technology, there has also been proposed a conductive edge which is mounted on the outer peripheral portion of a diaphragm of a speaker and has a conductive material mounted on a corrugation or the like of a suspension portion which is generally called an edge. (Japanese Utility Model Laid-Open No. 4-36399). In addition, a repulsion planar speaker using this conductive edge has already been proposed (Japanese Patent Laid-Open No. 6-284499).

A repulsion flat speaker using such a conductive edge, particularly a repulsion flat speaker for a large input, whose performance has been improved from the former 40 W specification to the 80 W specification which is doubled as a main conventional example. 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), the sandwich structure has a core material 3C made of hard urethane foam 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.
(See FIG. 5 and FIG. 6). It is 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-formed and the outer peripheral portion is trimmed to have a predetermined outer size.

[0007] At the center of such skin materials 3S1 and 3S2, a concave portion 3SD having a depth of 2.2 mm and a diameter of 36 mm is provided. FIG. 4 (a) shows the core material 3
This shows a state before C is sandwiched between the skin materials 3S1 and 3S2.

The bottoms of the recesses 3SD of the skin members 3S1 and 3S2 are flat, and the rising portions 12 are inclined at 30 degrees from the outer periphery of the recesses 3SD.
Is provided. Core material 3 with skin materials 3S1 and 3S2
When C is sandwiched and bonded, a cross-sectional shape as shown in FIG. 4B is obtained.

Further, in order to mount the recess 3SD on the voice coil 4, as shown in FIG.
A hole Mo of φ34.3 mm is made by punching with a press, 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. 4D). (Refer to the enlarged view of X1). In this way, the diaphragm 3
Is formed.

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

The voice coil 4 uses a coil wire having a conductor diameter of 0.28 mm coated with an insulating layer and further coated with a heat-resistant varnish (varnish so-called SV varnish). 30mm, winding width about 12
mm, six-layer winding, and a coil having a so-called para-winding structure in which two coil wires are wound in parallel at the same time. Each coil has a DC resistance of about 3.2Ω. The difference between this voice coil 4 and a general speaker voice coil is as follows.
The point is that a bobbin-less structure is used for the purpose of improving magnetic efficiency and reducing the weight of the vibration system.

When attaching the diaphragm 3 to the voice coil 4, as shown in FIG. 5, an assembling jig J is used to insert the voice coil 4 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. 5, the voice coil 4 is positioned on the center line of the diaphragm 3 in the thickness direction.
At the position where the center lines in the winding width direction are overlapped, the upper end and the lower end of the voice coil 4 are
1, 3S2 are arranged at equal distances from the surface.

A connection portion between the voice coil 4 and the diaphragm 3 will be described with reference to an enlarged sectional view of a local portion X2 in FIG.
A flat portion H1 of the skin materials 3S1 and 3S2 is in contact with a substantially central portion in the vertical direction of the voice coil outer peripheral portion 41. The voice coil outer peripheral portion 41, the flat portion H <b> 1 of the diaphragm 3 and the oblique rising portion 12 form a groove V in the voice coil outer peripheral portion 41 over the entire circumference.

The grooves V are, of course, flat portions H
Since it is divided into upper and lower parts by 1, it is also configured on the back side of the diaphragm 3. That is, as can be seen from the enlarged cross-sectional view of the local portion X2 in FIG. 5, the groove portion V is provided at two upper and lower portions.
Acrylic adhesive G (approximately 0.38 g) is uniformly applied near the upper end of the voice coil outer peripheral portion 41, and the coil cap 5 is attached.

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

Further, as shown in the sectional view (represented by K), one end of the cylindrical portion 5a is bent toward the inner diameter side, and the other end is bent outward. I have. As described above, the flange portion is provided at both ends of the cylindrical portion 5a, and one flange (hereinafter, referred to as an inner flange 5b).
Has an inner diameter of 31.5 mm, and the other flange (hereinafter, referred to as an outer flange 5c) has an outer diameter of 44.1 mm. In order to prevent generation of back electromotive force when the voice coil 4 is operated, a slit SL is provided in which the inner flange 5b, the outer flange 5c and the cylindrical portion 5a of the coil cap 5 are linearly cut.

When the cylindrical portion 5a of the coil cap 5 is inserted into the outer peripheral portion 41 of the voice coil and pressed 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. , The inner flange 5b, the voice coil outer peripheral portion 41, the inner wall of the cylindrical portion 5a of the coil cap 5, and the groove V shown in the local enlarged view X2 of FIG. Further, the bottom portion of the outer flange 5c and the flat surface portion 3S of the skin material 3S1.
The adhesive G wraps around the contact portion of F, and the adhesive G protrudes uniformly on the oblique portion provided on the outer flange 5c and the surface of the skin material 3S1. FIG. 6A shows this state.

When a predetermined time has elapsed in this state, the adhesive G
Is hardened, and the voice coil 4, the coil cap 5, and the skin material 3S1 (diaphragm 3) are adhered and fixed to each other. After the diaphragm 3 is attached to the voice coil 4 in this manner, the diaphragm 3 is once extracted from the assembly jig J, turned over, and set again on the assembly jig J.

Then, the adhesive G is applied to each part on the back side similarly to the front side.
Is uniformly 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. 6B, the voice coil 4, the coil cap 5, and the diaphragm 3 are bonded. Be combined. 6B is referred to as a vibration system component 40. The enlarged view of the local portion X3 in FIG. 6B shows a 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 repulsion planar speaker having a repulsion magnetic circuit RM as shown in FIG. 7 is obtained. That is, two magnets RM1 and RM2 magnetized perpendicularly to the thickness direction of a disc shape or a ring shape (ring shape in the example of FIG. 7) are used, and these two magnets RM1 and RM2 have the same polarity ( In this case, N
The poles RM3 are arranged so as to face each other and repel each other, and a plate RM3 made of a soft magnetic material is sandwiched between the poles (see an enlarged view of a local portion X4 in FIG. 7). Then, a repelling magnetic circuit is formed to induce the repelling magnetism into the plate RM3 and to flow the magnetism toward the outer peripheral portion of the plate RM3 to generate a constant magnetic flux outside the plate RM3. Further, the plate RM3
The voice coil 4 described above is arranged with a certain clearance around the outer periphery of the voice coil.

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

The conductive edge 1E has the shape of a hollow disk, and has a sectional shape as shown in FIGS. A flat portion H2 having an inner diameter of 94 mm and about 4 mm from the inner diameter toward the center of the hollow portion is provided, and the flat portion H2 is a bonding portion with the outer peripheral portion of the diaphragm 3. Explaining the outline of the cross-sectional shape with reference to FIG. 4D, a corrugation 11 having a concentric corrugated shape is formed following a pasting portion (flat portion H2) to the diaphragm 3. The pitch of the corrugations 11 is 6 mm, and the height and depth of the corrugations 11 are 2.
At 25 mm, the top and bottom of corrugation 11
They are connected with a radius of about 2 mm.

The manufacturing process of such a conductive edge 1E will be described with reference to FIGS. First, the edge base material constituting the conductive edge 1E is, for example, 1 warp and weft together.
6th, using a single twist polyester and cotton blend yarn,
Weave density vertical 55 lines / inch, woven with transverse 50 / inch, to obtain a cotton fabric having a weight 100g~110g / ^{M 2.} This cotton cloth is 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 is coated on one of the surfaces to form a rubber coat. Furthermore, after giving warm air drying to the woven fabric on which the rubber coat was formed,
It is cut to a predetermined width by a slitter to obtain a rubber-coated edge base fabric B that is generally used frequently.

Such a rubber-coated edge base cloth B includes:
Two flat braided tinsel wires 2 for supplying power to the voice coil 4 are mounted on the rubber coat surface Ba side. The flat knitted tinsel wire 2 is sewn to the rubber-coated edge base cloth B with a thread 2w called Conex # 40 as shown in an enlarged view of a local portion X5 in FIG. 8A.

The two flat knitted tinsel wires 2 are shown in FIG.
From the center line Q0, the distance d (d = 1
5 mm), and lines Q1 and Q2 parallel to the center line Q0
(The pitch of the lines Q1 and Q2 is about 30 mm). The flat braided tinsel wire 2 is made of a cadmium (Cd) alloy copper wire having a bus diameter of 0.1 mm and a width of 0.3 mm and a thickness of 0.024.
mm foil, and wrapped in a single layer at about 40 ± 4 turns / cm around 40-count two-ply stranded meta-aramid fiber. It is woven.

The rubber-coated edge fabric B to which the flat knitting wire 2 is sewn is hot-pressed. The temperature of the hot-pressing mold 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 a general edge molding method. After the hot-press molding step, the phenol resin or the like impregnated in the rubber-coated edge base fabric B hardens, and a corrugation 11 having a predetermined shape is formed at a predetermined position of the rubber-coated edge base fabric B.
Is molded. After molding, flat knitting wire 2 from the molding die
Take out the molded product of the rubber-coated edge base cloth B with
As shown in FIG. 8B, the two flat braided tinsel wires 2 are in a state along the corrugated irregularities of the corrugation 11.

The rubber coated edge base cloth B having the two flat braided tinsel wires 2 mounted at predetermined positions as shown in FIG. 8B is transferred to a trimming step. Then, unnecessary portions of the inner portion and the outer portion are cut off by cutting at an inner broken line portion Z1 and an outer broken line portion Z2 in FIG.
The conductive edge 1E is completed as shown in FIG.
At this time, a trimming die for trimming is prepared in advance, and the rubber-coated edge base fabric B having two flat knitted tinsel wires 2 shown in FIG. Unnecessary portions are cut out by placing the mold in a mold and performing a press process to obtain a desired conductive edge 1E as shown in FIG. 9B.

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

The flat braided tinsel wire 2 extending to the inner peripheral side (the voice coil 4 side) of the conductive edge 1E is applied to the surface skin material 3S1 of the diaphragm 3 via the rubber-coated edge base cloth B. The extension end of the flat knitting tinsel wire 2 is attached to a predetermined position near the voice coil outer peripheral portion 41. The extension end of the flat braided tinsel wire 2 extended to the voice coil outer peripheral portion 41 side is wire-connected to the end (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 of the flat braided tinsel wire 2 on the outer peripheral side of the conductive edge 1E is connected to the diaphragm 3 mounted on the voice coil 4.
As shown in FIG. 7, after being attached to a predetermined position of the speaker frame F, a power supply terminal lug (not shown)
It is connected and wired. That is, after the outer peripheral portion of the conductive edge 1E is attached to the flange portion of the speaker frame F by adhesion, when the power supply terminal lug is attached to the flange portion of the speaker frame F with screws or the like, the power supply terminal lug is used. The connection wiring is formed by pressing a part of the terminal lug against the end of the flat knitting wire 2.

The loudspeaker in such a state is the voice coil outer peripheral portion 4 projecting from the diaphragm 3.
1, That is, the coil cap 5 is attached to the outer peripheral portion 41 of the voice coil exposed to the atmosphere having poor thermal conductivity. As a result, the heat radiation efficiency of the voice coil 4 is significantly improved, and the input resistance performance (40 W) of the conventional speaker is improved.
, 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 even if a signal of twice or more (80 W or more) is input. The repulsion flat speaker operates normally without any disconnection or the like.

However, such a repulsive flat speaker has an 8
When an input signal of 0 W is continuously applied, the voice coil 4 itself maintains a normal state sufficient to drive the speaker at the time when about 32 to 40 hours have elapsed, but the flat knitting thread attached to the conductive edge 1E is not used. It was confirmed that cracks occurred in the copper foil of the kinshi wire constituting the wire 2, and the flat knit kinshi wire 2 was eventually broken, resulting in an inoperable state.

The conductive wire used to supply power to the voice coil 4 and the like for driving the diaphragm 3 and the like of the speaker is required to have extremely high bending resistance because the conductive wire itself is subjected to amplitude motion. As a conductive wire material for a speaker, which has the best track record at present, a tinsel wire is knitted (or twisted) in an arbitrary number of cords (hereinafter referred to as a cord-knitting wire 2S; It is well known that an example of a speaker using the Kinshi wire 2S is shown in FIG. 10). When tension is repeatedly applied to such a braided tinsel wire 2S, when the braided tinsel wire 2S falls into a so-called "stretching" phenomenon, the copper foil of the tinsel wire forming the braided tinsel wire 2S is cracked in a very short time. It is also well-known that the occurrence of the phenomenon eventually leads to a disconnection state.

The means for preventing the tension phenomenon of the braided tinsel wire 2S will be described below by taking as an example a general speaker using the braided tinsel wire 2S that does not use the conductive suspension (conductive edge IE) described above.

As shown in FIGS. 10 (a) and 10 (b), the length of the cord braiding wire 2S arranged on the back side of the diaphragm 3 is
The size is set to be equal to or greater than the limit amplitude movement (hereinafter, referred to as full stroke) of vibration system components (hereinafter, referred to as vibration system) such as diaphragm 3, edge E, voice coil 4, and damper D, and is appropriately formed. Has been given. Note that FIG.
In the perspective view of (b), the diaphragm 3 and the edge E are omitted so that the arrangement of the braided tinsel wire 2S can be easily understood.

Of course, the full stroke dimension is
It is regulated by the full stroke dimension of the damper D or the edge E, and in a vibration system full stroke state, a state where a strong tension is applied to the damper D or the edge E (hereinafter referred to as a tension state). Such a full stroke state occurs when an excessive input or an input in a state close to the input is applied to the voice coil 4, and in such a state, the end of the voice coil 4 housed in the magnetic circuit is generated. The collision easily occurs with the yoke Y, and when the collision occurs, an extremely loud noise is generated and the voice coil 4 may be broken.

Therefore, as a measure against the conventional full stroke, the full stroke dimension of the damper D is changed to the edge E.
Is set to be smaller than the full stroke size. According to this setting, when the vibration system falls into a full stroke state, the damper D is stretched, a stopper function is generated in the damper D, the collision between the voice coil 4 and the yoke Y is prevented, and the cord braid wire 2S Is prevented. That is, the full stroke size of the damper D is the actual vibration system full stroke size.

On the other hand, an example of a conventional speaker using a conductive damper 1D which is a kind of a conductive suspension will be described with reference to FIGS. 11 (a) and 11 (b).

As shown in the cross-sectional view of FIG. 11 (a) and the perspective view of FIG. 11 (b), the flat knitted tinsel wire 2 is sewn along the corrugation to form the conductive damper 1D. When the conductive damper 1D is in a state where the conductive damper 1D is stretched, or in a state close to the stretch, occurs frequently, the flat knitting yarn wire 2 mounted on the corrugation becomes a state in which the conductive damper 1D is stretched. It is self-evident that this is a fundamentally undesirable phenomenon for the Kinshi Line. In addition, the diaphragm 3 and the edge E are omitted from the perspective view of FIG. 11B so that the arrangement of the flat knitted tinsel wire 2 can be easily understood.

Therefore, in the speaker using the conductive damper 1D, the outer diameter of the conductive damper 1D is made as large as possible to increase the full stroke size, thereby expanding the movable range of the conductive damper 1D. The design is such that the full stroke dimension is smaller than the full stroke dimension of the conductive damper 1D. With this design, the edge E is made to stretch at the time of the full stroke of the vibration system, so that the edge E has a stopper function to prevent the collision between the voice coil 4 and the yoke Y, and the flat knitting yarn It serves the purpose of preventing the line 2 from being stretched. That is, the full stroke dimension of the edge E is the actual vibration system full stroke dimension.

As described above, most of the loudspeakers (for example, loudspeakers for low-range sound, full-range sound, etc.) which use the conventional braided tinsel wire 2S and the conductive damper 1D and which have a large amplitude of the vibration system are provided by the damper D ( Or conductive damper 1
The vibration system is supported by two suspensions D) and edge E. In order to prevent the braided tinsel wire 2S or the flat braided tinsel wire 2 from being stretched in the full stroke state, the braided tinsel wire 2S or the flat braided tinsel wire 2S or the flat braided tinsel wire 2D is stretched by stretching either the damper D (or the conductive damper 1D) or the edge E. Since a structure (a speaker structure having a fail-safe function) capable of preventing the knitting wire 2 from being stretched can be designed, speakers having such a structure are actually mass-produced.

[0042]

To summarize the above, in order to prevent the string braided wire 2S or the flat braided wire 2 from being stretched due to the full stroke of the vibration system in the loudspeaker, a damper D (or Conductive damper 1
By providing a fail-safe function of exerting a stopper function when one of the edge D) and the edge E is stretched, the stretch of the braided kinnish wire 2S or the flat knitted kinshi wire 2 which causes disconnection is prevented.

Therefore, at the time of full stroke, when either the damper D (or the conductive damper 1D) or the edge E is stretched, the stretched state exerts a stopper function. As shown in FIG. 7, the repulsion planar speaker does not use the damper D (or the conductive damper 1D) and has a structure in which the vibration system is supported only by the conductive edge 1E. That is, the loudspeaker has a single suspension (hereinafter, referred to as a single suspension) and has a structure in which the flat braided tinsel wire 2 is attached along the surface of the corrugation 11.

That is, in such a single-suspension repulsive planar speaker, the full stroke dimension of the vibration system is substantially the full stroke dimension of the conductive edge 1E, and the conductive edge 1
When E is stretched, the flat knitted tinsel wire 2 is naturally stretched as well. In particular, the withstand power is 2 from the previous 40W specification.
It can be easily inferred that, in a large-input repulsion planar speaker whose performance has been improved to the double specification of 80 W, the amplitude of the vibrating system becomes large, and it is easy to fall into a state of tension or close to tension.

In order to cope with the tension phenomenon of the flat braided tinsel wire 2 attached to the conductive edge 1E as a single suspension, a method of expanding the movable range of the conductive edge 1E as much as possible is as follows.
Although a technique such as enlarging the width dimension and the depth dimension of the corrugation 11 which constitutes the above is immediately conceivable as a feasible and simple method, these techniques have the following problems.

That is, when the movable range of the conductive edge 1E is widened, the lower end portion of the voice coil 4 naturally collides with the bottom surface of the speaker frame F (hereinafter, colliding with the bottom surface is referred to as bottom contact). If the depth dimension of the speaker frame F is increased to prevent the bottom contact, the conductive edge 1E will be in a full stroke state, so that the conductive edge 1E will be stretched, thereby causing the flat braided tinsel wire 2 to be stretched. Fall into a vicious circle.

That is, in a speaker having a single suspension structure, a method of expanding the movable range of the conductive edge 1E as much as possible is that the outer diameter of the conductive edge 1E and the depth of the speaker frame F have a sufficient margin for input signals. This is only possible at the point of holding, and in order to completely clear the 80W input specification, the outer diameter of the conductive edge 1E and the depth of the speaker frame F, which are much larger than the current state, are required. This means that it will be a speaker with extremely large external dimensions compared to a speaker with similar performance, which has the disadvantages that it is unrealistic and increases the cost, and at the same time limits the design method become.

As another method, a component having a stopper function, for example, a stopper S1 made of a cushion material such as felt or urethane is provided at the bottom of the speaker frame F as shown in FIG. In addition, it absorbs and radiates abnormal sound generated when the voice coil 4 hits the bottom, and effectively reduces the impact at the time of hitting the bottom, preventing the voice coil 4 from being broken and preventing the conductive edge 1E from being stretched. Although a method is conceivable, this method has the following disadvantages.

That is, when the vibration system makes a full stroke toward the bottom side of the speaker frame F as described above, the conductive edge 1E does not cause a tension phenomenon due to the presence of the stopper S1. Kinshi Line 2 does not stretch too. However, since the vibration system performs an amplitude motion, it naturally moves in the opposite direction. Therefore, if the stopper S1 is not installed not only on the bottom of the speaker frame F but also on the side opposite to the bottom of the speaker frame F, the conductive edge 1E will be generated when the vibration system makes a full stroke in the opposite direction.
, And the flat knitting wire 2 is also similarly stretched.

In consideration of the fact that the vibration system also makes a full stroke in the opposite direction, a stopper S1 is provided at the bottom of the speaker frame F as shown in FIG. It is also conceivable to provide S2. However, since two stoppers are required after all, the speaker structure is further complicated. In particular, in order to provide the stopper S2 on the side opposite to the speaker frame F, a dedicated part S3 for attaching the stopper S2 is required in addition to the stopper S2, so that the assembling work of the speaker is further complicated and naturally. However, it is clear that cost increase factors such as an increase in parts cost and an increase in the number of assembling steps are increased.

Therefore, the present invention is intended to improve the durability of the flat knitted tinsel wire 2 attached to the conductive edge 1E, particularly the problems that occur when the above-described repulsion planar speaker is improved in performance, To provide a reliable speaker suspension structure and a speaker capable of maintaining basic performance without disconnection for at least 96 to 100 hours in a state where an input signal of 80 W is continuously applied as specific performance. It is intended for.

[0052]

In order to achieve the above object, a speaker suspension structure according to the present invention is provided with a corrugation having a concentric wave shape, and in a direction crossing the corrugation and the corrugation waveform. In a speaker suspension structure having a hollow disk-shaped conductive suspension in which a flat braided tint wire for supplying power to a voice coil is mounted along the irregularities of the speaker, a corrugated flat braided tinsel wire formed on the conductive suspension A large corrugation portion having a cross-sectional length longer than the cross-sectional length of the cross section in the mounting direction is formed at a predetermined position of the conductive suspension by integral molding, and the flat braided tinsel wire is mounted along the corrugations of the large corrugation portion. I have to.

The loudspeaker of the present invention uses two magnets, which are magnetized perpendicularly to the thickness direction of a disk or a ring, and repels the two magnets with the same polarity facing each other. And a plate made of a soft magnetic material is sandwiched by the same polar surface, and a repulsive magnet is induced in the plate by facing the same pole, and the magnet flows toward the outer peripheral portion of the plate. A magnetic circuit that generates a constant magnetic flux on the outer side of the plate as a repulsive magnetic circuit, and furthermore, a voice coil is arranged on the outer peripheral portion of the plate with a certain clearance to the plate, and the outer peripheral portion of the voice coil is arranged. Corrugation between the outer periphery of the diaphragm and the speaker frame in a concentric wave shape A hollow disk-shaped conductive suspension formed with a flat knitting wire for supplying power to the voice coil is provided in a direction crossing the corrugation and along the corrugations of the corrugation. A large corrugation portion having a cross-sectional length longer than the cross-sectional length of the corrugation flat knitting wire formed in the mounting direction is integrally formed at a predetermined position of the conductive suspension, and the flat knitting wire is formed of the large corrugation portion. It is worn along the corrugations.

As described above, the present invention reexamines the structure of the conductive suspension itself, which also functions as a speaker suspension, and places a large corrugation portion having a cross-sectional length longer than that of the corrugation formed on the conductive suspension at a predetermined position. The flat knitting wire is attached along the large corrugation section.

Thus, in the full stroke state of the conductive suspension, even when the original small corrugation portion having a short cross-sectional length is in a state of being stretched, the large corrugation portion having a long cross-sectional length can maintain a shape with a margin. It becomes possible. In other words, by mounting the flat braided wire along the surface of the large corrugation portion, it is possible to almost eliminate the state in which the tinsel wire constituting the flat knitted wire is stretched.

Further, by adopting such a suspension structure for the repulsive flat speaker, the durability of the flat braided tinsel wire 2 attached to the conductive edge can be greatly improved. Basic performance can be maintained without disconnection for at least 96 to 100 hours while signals are continuously applied, and a reliable speaker (repulsive flat speaker) can be realized.

[0057]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. The conductive edge structure shown in this embodiment and the speaker using the same (repulsion plane speaker) are basically the conventional conductive edge described in FIGS. 4 to 9 and the repulsion plane speaker using the same. Hereinafter, the common parts are the same as those in the related art, and the reference numerals of the common parts are the same as those in FIGS.

Conductive edge 1E shown in this embodiment
Is substantially the same as the conventional example (FIGS. 4 to 9), such as the material of the conductive edge 1E and the plain knitting yarn 2, or the molding method thereof, except for the method of mounting the plain weave yarn 2 on the conductive edge 1E.

FIG. 1 shows a conductive edge 1 to which the present invention is applied.
FIG. 10 is a view for explaining E, but it is manufactured basically in the same procedure as that described with reference to FIGS. As shown in FIG. 1 (a), a flat knitting tinsel thread 2 (17-piece set) similar to the conventional one is sewn to the same rubber-coated edge base fabric B in parallel at the same position as the conventional one. Further, the rubber-coated edge base fabric B to which the flat knitted tinsel wire 2 is sewn is hot-pressed as in the conventional example, and the corrugation 11 is formed by the hot-pressing. The two flat knitted tinsel wires 2 attached at predetermined positions and along the corrugations 11 are transferred to the trimming process, and the inner broken line portion Z is set.
By cutting at 1 and the outer broken line portion Z2, unnecessary portions at the inner portion and the outer portion are cut off to complete the conductive edge 1E as shown in FIG. 1 (b).

As described above, although it is basically the same as the conventional example, the method of mounting the flat braided tinsel wire 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 away to complete the conductive edge 1E of the present invention. X7
As shown in an enlarged perspective view (FIG. 2 (b)), the height and depth of corrugations at the place where the flat knit tinsel wire 2 is mounted are increased.

That is, the distance d from the line Q0 is symmetrical on both sides of the line Q0 passing through the center of the conductive edge 1E.
Lines Q1 and Q parallel to line Q0 with (d = about 15 mm)
Corrugations larger than the conventional corrugations 11 (referred to as large corrugations 11L) are partially provided on the line 2 (the pitch of the lines Q1 and Q2 is about 30 mm). Note that the width W of the large corrugation portion 11L is about 7 mm.

In order to make it easy to understand the difference between the large corrugation section 11L and the conventional corrugation section 11 (hereinafter referred to as a small corrugation section 11) installed at another position, the large corrugation section 11L and the small corrugation section 1L are provided.
FIG. 2 (c) shows the cross-sectional shape of FIG. 1 in an overlapping manner, and will be described with reference to FIG. 2 (c).

In FIG. 2C, a solid corrugation portion 11L is shown by a solid line, a conventional corrugation portion 11 is shown by a broken line, and a small corrugation portion 11 in the present invention. The conductive edge 1E of the present invention has a hollow disk shape as in the conventional example, and the inner diameter of the hollow portion is 9%.
A flat portion H2 of about 4 mm is provided at 4 mm from the inner diameter toward the center of the hollow portion, and the flat portion H2 is a portion where the diaphragm 3 sticks to the outer peripheral portion. This tension portion is provided in the large corrugation portion 11L to which the flat knitting wire 2 is attached and the small corrugation portion 11 in which the flat knitting wire 2 is not attached.

Then, following the pasting portion (flat portion H2), a small corrugation portion 1 having a concentric wavy shape is formed.
1 and a large corrugation portion 11L is formed partially (on the lines Q1 and Q2). The pitch of the small corrugations 11 is 6 mm as in the conventional example, and the height and depth of the irregularities of the small corrugations 11 are 2.25 mm above and below the center line L0.
Are joined at a radius of about 2 mm. On the other hand, the pitch of the large corrugations 11L is 6 mm, the height and depth of the irregularities of the large corrugations 11L are distributed 3.2 mm above and below the center line L0, and the top and bottom of the large corrugations 11L are about 1.8 mm. Are connected by a radius.

After going through such a manufacturing process, the conductive edge 1E to which the flat braided tinsel wire 2 is attached by sewing along the large corrugation portion 11L is naturally obtained.
The conductive edge 1E is joined to the diaphragm 3 in the same manner as in the conventional example, and the end of the flat braided tinsel wire 2 extending to the voice coil 4 side and the voice coil 4 are wire-connected by soldering. Similarly, the diaphragm 3 attached to the voice coil 4 is bonded to a predetermined position of the speaker frame F. Then, through a predetermined process, such as the input terminal lugs and the connection wiring of the two ends of the flat braided tinsel wire 2 arranged on the flange portion of the speaker frame F, a rebound flat speaker as shown in FIG. 3 is completed.

The basic structure of FIG. 3 is the same as that of FIG. 7, and the same components are denoted by the same reference characters. Note that FIG.
Is a diagram for explaining the operation of the vibration system (conductive suspension structure) when the repulsion planar speaker of the present invention performs a sounding operation (operation in the full stroke state of the conductive edge 1E), which will be described below.

When the conductive edge 1E is in the full stroke state in the vertical direction, the vibration system is in the state T1 and the state T1 shown in FIG.
It looks like 2. As described above, when the conductive edge 1E enters the full stroke state in the vertical direction, the local X in FIG.
As shown in the enlarged sectional view of FIG. 8 (see the upper part of FIG. 3) and the enlarged sectional view of the local part X9 in FIG. 3 (see the lower part of FIG. 3),
The small corrugation portion 11 having a short sectional length is in a stretched state, that is, an oblique linear state (broken line portion) shown in each enlarged view of FIG.
Can maintain a form with a margin. Thereby, the flat braided tinsel wire 2 on which the flat braided tinsel wire 2 is mounted along the surface of the large corrugation portion 11L hardly becomes in a state of being stretched.

As described above, despite the fact that the speaker suspension structure is a single suspension, even if the conductive edge 1E falls into a full stroke state, the small corrugation portion 11 necessarily exerts the stopper function, and the large corrugation portion. The tension state of the flat knitting tinsel wire 2 mounted on the 11L can be prevented. That is, the conductive edge 1E itself has a structure in which a fail-safe function is added. Even if the input signal of 80 W is continuously applied to the repulsion flat speaker of the structure of the present invention continuously for 100 hours, the conductive edge 1E is attached to the conductive edge 1E. The flat knitted kinshi wire 2 maintained the basic performance without breaking and became able to secure desired performance.

Also, needless to say, the conductive suspension structure of the present invention (conductive suspension structure employing conductive edge 1E described in the above embodiment).
Can also be applied to the structure of a speaker having a conductive damper 1D which is a conventional representative conductive suspension as shown in FIG. That is, when the conductive suspension structure of the present invention is applied, in the state of the conductive damper 1D at the time of full stroke in FIG. 11, the conductive damper 1D itself has a stopper function without causing the flat braided tinsel wire 2 mounted on the corrugation to stretch. Things become possible.

As a result, as in a speaker having the conductive damper 1D as shown in FIG. 11, it is necessary to take measures to prevent disconnection of the flat braided tinsel wire 2 attached to the conductive damper 1D by the stopper function by the edge E being stretched. Has the advantage of greatly expanding the degree of freedom in design.

The large corrugation portion 11L may be provided not in the entire radial direction of the corrugation 11 but in a part in the radial direction. That is, in the above-described embodiment, the corrugation 11 has two peaks, but the large corrugation portion may be provided only on one peak. Further, the large corrugation unit 11L is provided with a corrugation 11
It is preferable to provide by integral molding with
You may make it integrate by crimping etc. In the case where the corrugation 11 is not formed into a waveform, but is formed into a linear cross section, a large corrugation portion having a long cross-sectional length is formed by forming only the large corrugation portion 11L into a waveform.

[0073]

According to the conductive suspension structure of the present invention, a single conductive edge is provided with corrugations having a plurality of large and small cross-sectional lengths. Therefore, in the full stroke state of the conductive edge, a small corrugation portion having a short cross-sectional length falls into a stretched state, but a large corrugation portion having a long cross-sectional length can maintain a form with a margin. In other words, by attaching the flat braided wire which is a conductor along the surface of the large corrugation portion, it is possible to almost eliminate the state in which the tinsel wire forming the flat knitted wire is stretched.

Therefore, despite the fact that the suspension structure of the speaker is a single suspension, the small corrugation part inevitably exhibits a stopper function even if it falls into a full stroke state, and the flat knitting yarn mounted on the large corrugation part. Stretching of the wire can be prevented.

Further, by adopting such a suspension structure for the speaker, the durability of the flat braided tinsel wire attached to the conductive edge can be greatly improved.
As a specific performance, the basic performance can be maintained without disconnection for at least 96 to 100 hours in a state where an input signal of 80 W is continuously applied, and a reliable speaker (repulsive flat speaker) can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a suspension structure for a speaker and a conductive edge used in the speaker according to the present invention. FIG. FIG. 3B is a perspective view showing a state where trimming is performed after molding.

FIG. 2 is a perspective view of a conductive edge shown in FIG. 1;
Is a perspective view showing the completed state after trimming,
(B) is a locally enlarged perspective view showing a large corrugation part,
(C) is an enlarged sectional view of a conductive edge.

3A and 3B are a cross-sectional view of the repulsion planar speaker using the conductive edge shown in FIG. 1 and an enlarged cross-sectional view showing a full stroke.

FIG. 4 is a diagram showing a manufacturing process of a diaphragm of a repulsion flat speaker using a conductive edge in a conventional example, and a sectional view showing the diaphragm structure and a partially enlarged sectional view of the diaphragm.

FIG. 5 is a view showing a process of assembling the vibration system components of the repulsion planar speaker using the conductive edge shown in FIG. 4, and a sectional view showing an assembled state and a partially enlarged sectional view.

6A and 6B are diagrams showing a state immediately before and after assembly of a vibration system component of the repulsion flat speaker using the conductive edge shown in FIG. 4, and FIG. 6A shows a state of completion in a jig. And (b) are a sectional view and a partially enlarged sectional view showing an assembled state after being taken out of the jig.

7A and 7B are a cross-sectional view and a partially enlarged cross-sectional view of the repulsion flat speaker using the conductive edge shown in FIG.

8A and 8B are perspective views showing a process of manufacturing the conductive edge shown in FIG. 4, wherein FIG. 8A is a perspective view showing a state in which a flat knitting tinsel wire is sewn on a rubber-coated edge base cloth, and FIG. It is a perspective view which shows the state which carried out the hot-pressure molding of the base cloth which the kinshi wire sewn.

FIGS. 9A and 9B are perspective views showing a process of manufacturing the conductive edge shown in FIG. 4, wherein FIG. 9A is a perspective view showing a state immediately after the trimming after the hot pressing, and FIG. 9B is a perspective view showing the trimming after the hot pressing. FIG. 3 is a perspective view showing a completed application state and a partially enlarged perspective view showing a state in which a flat knitting tinsel wire is attached to a corrugation portion.

FIG. 10 is a diagram showing a general speaker using a cord braided wire without a conventional conductive suspension, and (a).
Is a sectional view thereof, and (b) is a perspective view thereof.

11A and 11B are views showing a general speaker using a conductive damper which is a conventional conductive suspension, wherein FIG. 11A is a cross-sectional view and FIG. 11B is a perspective view.

12 is a cross-sectional view showing a state in which a stopper for preventing full stroke is provided in the conventional repulsion planar speaker using a conductive edge shown in FIG. 4, in which (a) is a diagram in which one stopper is provided, and (b) is a diagram. It is a figure provided with two stoppers.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Corrugation (small corrugation part) 11L Large corrugation part 1E Conductive edge (conductive suspension) 1D Conductive damper (conductive suspension) 2 Plain knitting line 2w Plain knitting line sewing thread 3 Diaphragm 3C Diaphragm core material 3S1, 3S2 Skin Material 3SD Skin material concave portion 3SF Skin material flat portion 4 Voice coil 41 Voice coil outer peripheral portion 5 Coil cap D Damper E Edge F Speaker frame G Adhesive RM Repulsion magnetic circuit RM1 Magnet (for repulsion magnetic circuit) RM2 Magnet (for repulsion magnetic circuit) ) RM3 plate (for repulsive magnetic circuit) W Large corrugation width Y Yoke

Claims (2)

[Claims] A corrugation having a concentric wave shape is formed, and a flat braided tinsel wire for supplying power to a voice coil is mounted in a direction crossing the corrugation and along the corrugations of the corrugation. A suspension structure for a speaker having a hollow disk-shaped conductive suspension, comprising: a corrugation (hereinafter referred to as a large corrugation) having a cross-sectional length longer than a cross-sectional length of the corrugation formed on the conductive suspension in a mounting direction cross-section of the flat braided tinsel wire. A suspension structure for a loudspeaker, characterized in that a flat knitting wire is formed along a corrugation of the large corrugation portion by integrally forming the conductive suspension at a predetermined position of the conductive suspension. 2. A disk-shaped or ring-shaped two magnets which are magnetized vertically in the thickness direction, and are arranged so that the two magnets face each other with the same polarity and repel each other, and A plate made of a soft magnetic material is sandwiched between the same polar surfaces, and a repulsive magnetism is induced in the plate by facing the same polar members, and the magnetism flows toward the outer peripheral portion of the plate to cause the outer portion of the plate to flow. A magnetic circuit for generating a constant magnetic flux, and furthermore, a voice coil is arranged on the outer peripheral portion of the plate with a certain clearance with respect to the plate, and a diaphragm having a flat plate shape is provided on the outer peripheral portion of the voice coil. In the mounted speaker, a corrugation having a concentric wave shape is formed between the outer periphery of the diaphragm and the speaker frame. A hollow disk-shaped conductive suspension provided with a flat braided tinsel wire for power supply to the voice coil is provided in a direction crossing and along the corrugations of the corrugation, and the corrugation formed on the conductive suspension is provided. A corrugation (hereinafter, referred to as a large corrugation portion) having a cross-sectional length longer than the cross-sectional length of the flat knitting wire in the mounting direction of the flat knitting wire is formed at a predetermined position of the conductive suspension by integral molding. A loudspeaker, which is mounted along a corrugation corrugation.