JP3443032B2 - Flat 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 flat speaker provided with a repulsive magnetic circuit, and more particularly to a wiring structure of a thin and slender flat multipoint driving speaker.

[0002]

2. Description of the Related Art The present inventor has previously developed a speaker that can be made thin and has excellent conversion capability. In this speaker, a plurality of repulsive magnetic circuits are arranged at predetermined intervals with respect to a flat plate type diaphragm, and the diaphragm is driven at multiple points by voice coils arranged so as to correspond to the respective repulsive magnetic circuits. It is a planar multi-point drive type speaker (Japanese Patent Laid-Open No. 10-3274).
No. 91).

[0003]

The wiring structure and wiring technique of this flat multi-point drive type speaker will be specifically described based on the flat multi-point drive type speaker produced on the premise of actual production. The speaker shown in FIGS. 3 to 13 is substantially the same as that shown in Japanese Patent Application Laid-Open No. 10-327491, but since actual production is taken into consideration, there are differences in details. As shown in FIG.
This speaker has a structure in which three repulsive magnetic circuits RM are arranged at predetermined intervals with respect to an elongated diaphragm 3 to drive three points.

In each repulsive magnetic circuit RM, as shown in FIG. 11, two magnets RM1 and RM2 are arranged so that the same poles (N poles) face each other, and both magnets R are arranged.
A center plate RM3 is arranged so as to be sandwiched between M1 and RM2. Magnet RM
1, RM2 has a ring shape with an outer diameter of 15 mm, an inner diameter of 5.1 mm, and a thickness of 6 mm, and has a maximum energy product of 35 M
e neodymium magnet. Center plate RM
Reference numeral 3 denotes an iron perforated plate having an outer diameter of 15.83 mm, an inner diameter of 5.1 mm and a thickness of 2 mm, which is galvanized similarly to conventional general magnetic circuit components.

The edge 2 which is one of the vibration system parts of the speaker is generally called a cloth edge. The woven fabric which is the base fabric of the edge 2 is a 30-count single twisted cotton yarn for both warp and weft, and the weaving density is 60 for both warp and weft.
The raw material is a cotton cloth having a weight of 100 g to 110 g / m @ 2 and woven at a book / inch. This cotton cloth has a phenol concentration of 24
% Resin solution is impregnated, and a solution mixed with synthetic rubber such as NBR and SBR is further coated. The rubber-coated cotton cloth is dried with warm air, and then the rubber-coated cotton cloth is slitted by about 80 mm.
A rubber-coated base fabric is obtained by cutting into width.

At a predetermined position of this rubber-coated base cloth, a flat knitted tinsel wire 1h is formed by knitting an arbitrary number of conductive wires, which are commonly called tinsel wires made by winding a copper wire foil around a fiber as an input lead wire, in a flat net shape. Conex # 40, a type of aramid fiber
Two threads are sewn in parallel to each other at a position separated by 13 mm (pitch about 26 mm) from the center line of the woven cloth.

This flat knitted tinsel wire 1h has a busbar diameter of 0.1 mm.
This tin alloy copper wire was processed into a foil with a width of 0.32 mm and a thickness of 0.027 mm, and was wrapped around a 200-denier para-aramid fiber at 22 ± 2 turns / cm in a single layer to form a tinsel wire,
Furthermore, the braid pitch is 27.45 ± by making the tinsel wire into a set of 7 pieces.
It is knitted in a flat net shape at 0.82 mm / turn.

Next, the center line of the base cloth sewn with the flat knitted tinsel wire 1h is set in accordance with a predetermined position of the molding die.
Then, in a molding die heated to about 200 ° C., when the pressure is about 600 Kg (axial output) and the pressing time is about 5 seconds, hot pressing is performed to cure the phenol resin impregnated into the base cloth, A predetermined roll shape is formed at a predetermined position of the cloth, and the sewn flat knitted tinsel thread 1h is also formed along the roll 21. When the roll-molded product with the flat knitted tinsel wire 1h is transferred to the trimming process and unnecessary portions of the inner shape portion and the outer shape portion are cut off, the edge 2 ( Below, "conductive edge 2E"
Say. ) Is completed.

The conductive edge 2E obtained through the trimming process has a length of 202 mm and a width of 48 mm, and has a track shape in which a long side and a width are connected by an arc having a radius of 24 mm. The conductive edge 2E further has a bonding margin (hereinafter referred to as "outer bonding margin 22") having a width of about 3 mm in order to bond the conductive edge 2E to the frame 7 from the outermost portion toward the inner side. It is provided in each of the arc portion and the straight portion. A roll 21 having a width of 6 mm and a cross-sectional radius of 3 mm is formed inward from the outer bonding margin portion 22 in the straight portion. The roll 21 provided in the arc portion is set larger than the roll 21 provided in the straight portion by an arbitrary dimension. That is, the edge 2 described here has a width dimension and a section radius that are gradually larger than those of the straight portion, and has the maximum width in the vicinity of the apex of the arc.

Further, a sticking margin portion having a width of 4 mm (hereinafter referred to as "inner sticking margin portion 23") for adhering to the vibrating plate 3 toward the inside of the roll 21 is provided in the arc portion and the straight portion. Has been. As mentioned above, the flat knitted thread line 1
Since h is sewn in parallel at a predetermined interval (about 26 mm) in parallel, as shown in FIGS. 8 and 9, the flat knitting tinsel cord 1h is the surface of the straight portion of each inner sticking margin portion 23. In addition, one is attached in a straight line. Each of the flat knitted tinsel cords 1h is attached so as to reach the arc portion of the outer attachment margin portion 22 from the straight portion of the inner attachment margin portion 23, the end of the arc portion and the roll 21. Then, the end portion (1
Only ha and 1hb) are in a state of extending with a length of about 6 mm. Therefore, the flat knitted tinsel wire 1h serves as an input lead wire to the voice coil 4.

The vibrating plate 3 is made of pulp as a main raw material. The diaphragm 3 has a width of 29.4 m.
The external dimensions are m, length 183.4 mm, and thickness (depth) 3 mm. The ends of the long sides are connected by an arc with a radius of 14.7 mm, and the shape of the track is a stadium or the like when viewed from the front. . Further, as shown in FIG. 8, the diaphragm 3 is provided with a mounting hole 31 for the voice coil 4 on the center line thereof. The diameter of the mounting hole 31 is 17 mm, and the mounting positions are 1 at the center of the diaphragm 3 and 60 mm on both sides by the center distribution from the mounting hole 31. Further, a bonding margin portion 32 having a width of about 4 mm for mounting the edge 2 is provided on the outer peripheral portion on the back surface side of the diaphragm 3.

The method of attaching the conductive edge 2E to the diaphragm 3 is the same as the conventional method of attaching the diaphragm and the edge. That is, as a mounting method, an adhesive h (hatched portion shown in FIG. 8) is applied to the bonding margin portion 32 of the diaphragm 3, and the bonding margin portions 23 and 32 of the edge 2 and the diaphragm 3 are subjected to a heat press or the like. This is a method in which the conductive edge 2E is attached at a predetermined position by adhesion by a method. Since the flat knitted tinsel cord 1h is sewn on the straight portion of the inner side margin portion 23 of the conductive edge 2E as described above, the state along the straight side portion of the margin portion 32 of the diaphragm 3 is consequently obtained. Then, input conductive wire to the voice coil 4 (flat knitting thread wire 1
This is a wiring structure in which two h) are mounted in parallel (hereinafter referred to as "A wiring structure").

The method of mounting the voice coil 4 on the diaphragm 3 having the conductive edge 2E is as follows. The voice coil 4 is mounted in the mounting hole 31 of the voice coil 4, and each voice coil 4 is mounted.
The wire end portions (start of winding and end of winding) of the diaphragm 3 are laid on the back surface of the diaphragm 3, and the bonding margin portion 32 (edge 2) of the diaphragm 3 is
Of the flat knitting tinsel wire 1h attached to the inner side bonding margin portion 23) of the flat knitting wire portion 23h, and soldering each end portion to the parallel connection wiring (see FIG. 9).

The voice coil 4 and the diaphragm 3 are attached by adhesion. Specifically, around the mounting hole 31 of the voice coil 4, an adhesive agent collecting portion 33 having a slope portion of about 45 degrees is provided toward the outside, and each adhesive agent collecting portion 33 is formed as shown in FIG. Then, the adhesive h is applied. When the adhesive h hardens and reaches the required strength, the voice coil 4
And the diaphragm 3 is adhesively bonded. The diaphragm 3 with the voice coil 4 thus obtained is bonded to the frame 7 at the outer bonding margin portion 22 of the edge 2 of the diaphragm 3, as shown in FIG.

The frame 7 is obtained by injection-molding ABS resin containing glass fiber, and has a length of 228 mm and a width of 4 mm.
It has external dimensions of 9.6 mm and a depth (depth) of 15 mm. The bottom of the frame 7 has a diameter of 5 mm and a height of 1 at a center and a total of 3 locations distributed in the length direction from the center.
A 4 mm pole portion 71 is integrally molded. Two flanges 72 for mounting the input terminal lug 6 as shown in FIG. 11 are provided in one flange portion 72 for mounting the frame provided on the short side of the frame 7.

The two holes are square holes 73 each having a side of 2.5 mm and penetrated from the front surface to the back surface of the flange portion 72, and the diameter of the front surface of the flange portion 72 is 8 mm.
A counterbore portion 74 having a depth of 1 mm is provided coaxially with the square hole 73. The distance between the two square holes 73 is the same as the pitch dimension (26 mm) of the flat knitting tinsel wire 1h attached to the edge 2, and the square hole 73 has an input terminal lug 6 (commonly called a faston terminal lug). A 0.5 mm brass plate is pressed and a nickel-plated lug is attached by caulking. As shown in FIG. 11, one of the input terminal lugs 6 becomes a plus side lug 6a and the other becomes a minus side lug 6b.

As shown in a partially enlarged view of FIG. 11 (B),
The end portion of the flat knitted tinsel wire 1h attached to the edge 2 and a part of the input terminal lug 6 (the crimp portion 61) are connected and wired by soldering. Further, as shown in FIG. 11, three repulsive magnetic circuits RM are attached by screws b to the pole portion 71 of the frame 7 arranged in the center portion on the inner peripheral side of the voice coil 4. With such a configuration, a thin and slender planar multi-point drive type speaker in which one diaphragm 3 is driven by three voice coils 4 in the repulsive magnetic circuit RM is formed.

The thin and slender planar multi-point drive type speaker has an extremely narrow slender shape with a narrow width and is suitable for a limited installation space with a narrow depth. For example, even if the speakers are installed on the left and right sides of the screen of a flat-screen television using a plasma display or the like, specifically, the installation space of a limited shape (extremely thin shape) provided on both ends of the plasma display, This planar multi-point drive type speaker can be mounted, and the function can be sufficiently exhibited.

As a result of studying application of such a thin and slender speaker to a speaker in another field, in particular, a vehicle-mounted speaker, the characteristics and advantages of the speaker which is ultra-thin slender, thin and lightweight are obtained. It was found that there are many installation sites that can be utilized and it can be applied sufficiently. However, it was also found at the same time that there were problems that had to be solved, especially with respect to the wiring structure.

To explain this problem, the above-mentioned thin and slender planar multi-point drive speaker is designed on the premise of a flat panel television or the like which is a general household electric appliance, and a rated input of 10 W is required. It meets the demand. However, a speaker used for a vehicle is generally required to have a rated input of about 20W. When the rated input is doubled, various measures are required, and in particular, improvement of input resistance performance of the voice coil 4 and the flat knitted tinsel wire 1h which is the input conductor, and further improvement of amplitude resistance performance are essential requirements.

Then, various reliability tests were carried out. As a result, the voice coil 4 is basically advantageous for a large input because it has a wiring structure in which the three voice coils 4 are connected in parallel as described above. It was found that there is no problem with the current voice coil 4 even if a 20 W rated input test is actually performed. But,
The flat knitted thread 1h in the 20W rated input test is 20W
When it did not reach the value, the wire was broken, and it became clear that the 7-piece flat knitted thread wire 1h used in the speaker lacked strength.

As a countermeasure against such insufficient strength, a set of 13 flat knitted tinsel cords 1h was tried for a rated input of 20W. That is, the flat knitted tinsel wire 1h was changed to a set of 13 pieces, and a speaker having the same wiring structure as described above was manufactured as a prototype and rated 2
When a continuous input test of 0 W was tried, the test could be cleared. However, when the frequency characteristics of the speaker were measured, it was found that the sound pressure level was lower than that in the case of using the set of 7 flat braided tinsel wires 1h in almost the entire frequency band.

The cause of the decrease in the sound pressure level is the flat knitted tinsel wire 1.
The number of sets of Kinshi wire has increased from 7 to 13, and the width of 1.5 mm has increased to 3 from the increased number of sets.
It was determined that this was due to the increase in mm. That is, 7
Since the width of the tinsel thread doubled from that of the main set extends to the straight portion of the inner sticking margin portion 23 of the edge 2, the width of the sticking margin portion 23 is naturally widened so that it can be bonded to the diaphragm 3. It was judged that the weight of the diaphragm 3 was significantly increased by increasing the amount of the adhesive h.

In particular, the number of sets of the flat knitted tinsel wire 1h is approximately doubled. This is because the amount of copper foil having a large specific gravity is doubled, so that the weight added to the diaphragm 3 is significantly increased. found. However, on the other hand, as a result of examination based on experiments to guarantee a rated input of 20 W and past experience,
In order to secure a current capacity of 20W, it is essential to adopt at least 13 sets or more of flat braided tinsel wires 1h or 14 or more sets of string-shaped tinsel wires that have been commonly used in the past. I understood.

Therefore, as a measure against the sound pressure level reduction by the A wiring structure using the set of 13 flat knitted tinsel wires 1h as described above, the driving force of the vibration system, that is, the driving force of the magnetic circuit is improved. Is taken up as an important measure. As a method of improving the driving force, a magnet RM1,
It is easy to increase the size of RM2. The magnet RM
As a general method for increasing the sizes of 1 and RM2, there are a size increase in the thickness direction and a size increase in the radial direction.

However, increasing the sizes of the magnets RM1 and RM2 causes not only an increase in weight but also an increase in cost, which is not preferable for a vehicle-mounted speaker aiming at weight reduction. In particular, the neodymium magnets RM1 and RM2 have high performance, but have the drawback that the unit price per weight (gram) is expensive. Moreover, in the multi-point drive type speaker structure as described above, a total of six magnets are required at three locations, and it is clear that a slight increase in size of the magnets RM1 and RM2 leads to a significant increase in the cost of the speaker. Is.

Further, increasing the size of the magnets RM1 and RM2 in the thickness direction is counter to thinning, and increasing the size of the magnets RM1 and RM2 in the radial direction is not suitable when the size in the width direction is increased and the elongated shape is prioritized. It will be. Therefore, both methods can be said to be unsuitable for vehicle-mounted speakers that place importance on the space factor.

Further, as a wiring structure generally used in a conventional speaker, a string-shaped (set of 14) tinsel wire is arranged in a space on the back surface of the diaphragm, and the tinsel wire is used as a voice coil and an input terminal. There is a method of wiring between the two, and it is possible to adopt this wiring structure. However, in this wiring method, the wiring work is complicated because the wiring structure is complicated,
As a result, the assembly efficiency deteriorates, and the number of wiring steps increases, resulting in an increase in cost.

Moreover, this is a wiring structure in which the tinsel wire must be jumped and arranged between the voice coil 4 or the diaphragm 3 and the input terminal. Because the jumping part of this string-shaped brocade thread resonates at the time of large amplitude,
It is well known that the jumping phenomenon occurs and the diaphragm 3 comes into contact with the diaphragm 3 to generate an abnormal sound. The only countermeasure against the abnormal sound due to the jumping of the tinsel wire is to increase the space on the back side of the diaphragm 3, and the dimension in the thickness direction of the speaker is inevitably increased. One of the advantages of the type speaker is that the thin shape, which is one of the advantages, is greatly impaired.

In addition to the tinsel wires, various kinds of wires were used as input lead wires and various examinations were made on whether or not it could be adopted as the wiring structure of the planar multi-point drive type speaker. However, a wire material suitable for an input lead wire connected to the voice coil 4 that moves in amplitude from the input terminal fixed to the speaker frame 7,
That is, a wire rod that can be bent like a string and has excellent bending resistance is currently a string-shaped tinsel wire or a flat knitted tinsel wire 1.
There is no substitute for h.

From the above, it is not appropriate to increase the size of the magnets RM1 and RM2 or adopt a string-shaped tinsel wire as a countermeasure against the sound pressure level reduction. As an appropriate measure, wiring that does not increase the added weight to the diaphragm 3 without deteriorating the characteristics of the thin and slender speaker, and using a heavy-weight 13 or more flat knitted thread wire 1h It turned out that it had to be structured. Therefore, when not sticking to the conventional "A wiring structure", the following wiring structure was examined as another wiring structure.

That is, as shown in FIG. 12, a method is conceivable in which the advantage of the conductive edge 2E, which is advantageous for a thin and elongated shape, is easy to mount the flat knitting tinsel cord 1h, and has a proven track record in reliability, can be considered. Specifically, multiple (3)
The flat knitted tinsel wire 1h is parallel to the roll 21 of the edge 2
Of the voice coil 4 provided on the vibration plate 3 is mounted in the vicinity of a traversable position. . Then, the end portion of the flat knitted tinsel wire 1h extending to the outer bonding margin portion 22 of the edge 2 is provided with a wiring member 5 (5a, 5b) different from the flat knitted tinsel wire 1h as shown in FIG.
Wires are connected by a copper wire or the like having a diameter of 1 mm.
(5a, 5b) end and input terminal lug 6 of the speaker
A wiring structure (hereinafter, referred to as “B wiring structure”) that connects the (plus side lug 6a and the minus side lug 6b) is conceivable.

In this B wiring structure, unlike the A wiring structure in which the flat knitting tinsel wire 1h which is the input conductor is mounted on the entire surface of the bonding margin portion (straight portion) 32 of the diaphragm 3, This is a wiring structure that is attached only locally to the attachment margin portion (straight portion) 32 of the diaphragm 3. Therefore, the amount of copper foil of the flat knitted tinsel wire 1h added to the diaphragm 3 is significantly reduced, which is extremely effective in reducing the added weight to the diaphragm 3 and actually reduces the sound pressure level. The problem has been successfully resolved. However, when performing a continuous input test with a rating of 20W,
It was found that disconnection or pseudo disconnection occurred at the time when the specified value was not reached, and there was a problem in amplitude resistance performance.

In the continuous input test, the structure of the conductive edge 2E using 13 sets of the flat knitted tinsel wires 1h was not observed in the A wiring structure, but the flat knitted tinsel wires 1h were not broken, and the B wiring structure was As a result of investigating the cause of occurrence of wire breakage or pseudo wire breakage, it was confirmed that it was due to the width dimension of the roll 21 of the edge 2.

This will be described below. In the A wiring structure, the arc portion of the roll 21 of the edge 2 (hereinafter, referred to as "arc roll 21c") is diagonally crossed with the form B.
In the wiring structure, the flat knitted tinsel cords 1h are attached in a form of crossing the straight roll 21s at right angles. Comparing the lengths of the flat knitted tinsel wire 1h, the length of the flat knitted tinsel wire 1h mounted on the arc roll 21c is necessarily longer than the length of the flat knitted tinsel wire 1h mounted on the linear roll 21s. Has become. Further, as described above, the arc roll 21c
Since the width dimension of is larger than the width dimension of the linear roll 21s, the margin for large amplitude becomes larger due to the larger dimension difference, and the A wiring structure is more advantageous than the B wiring structure. Can be said.

Therefore, when an input signal in the vicinity of the amplitude limit of the speaker is applied, the linear roll 21s reaches the stroke limit, but the arc roll 21c still maintains a margin. When the above stroke limit is reached,
A so-called "edge tension" phenomenon is generated, and a strong tension is applied to the flat knitting tinsel cord 1h mounted on the straight roll 21s. The tinsel cords that compose the flat knitted tinsel cord 1h and the like are flexible and extremely tough in bending resistance, but are weak in tensile strength, and thus are flattened on the linear roll 21s in which tension is generated. It is considered that the breaking of the tinsel wire 1h is a natural phenomenon.

Further, since the B wiring structure can reduce the added weight to the diaphragm 3 as compared with the A wiring structure, the sound pressure level is improved as compared with the A wiring structure, but the sound pressure level is improved. This means that the amplitude of the diaphragm 3 is further increased, and the “edge tension” phenomenon is generated more strongly. Therefore, it is a matter of course that the flat knitting tinsel wire 1h mounted on the roll 21s portion is promoted to be broken or pseudo broken.

Therefore, the flat knitted thread wire 1h having the B wiring structure
In order to prevent the wire from breaking, it is necessary to increase the width dimension of the linear roll 21s in order to prevent the tension from being applied to the tinsel wire, that is, to increase the width to reduce the "edge tension" phenomenon. In order to reduce the "edge tension" phenomenon, an appropriate margin ratio must be expected, and the margin ratio leads to an increase in the width dimension of the linear roll 21s. The linear roll 21s has a width direction 2 of the speaker.
Since it exists at the location, the increase in the width dimension is doubled, and a slight increase immediately affects the elongated shape, which is not suitable for the speaker characterized by the elongated shape.

By the way, as shown in the figure, considering the compliance of the roll 21 of the edge 2 having a track shape when viewed from the front, the linear roll 21s is the arc roll 2
It is well known that it has higher compliance, that is, it is softer, because it does not receive a form factor than 1c. In order to adjust the compliance, it is a conventional means to increase the compliance of the arc roll 21c by widening the width of the arc roll 21c having low compliance (hard) and to make the compliance of the entire edge 2 uniform. It has been done from the past.

However, in the conventional A wiring structure, since the flat knitted tinsel wire 1h is arranged on the arc roll 21c wider than the linear roll 21s, even if an excessive input signal is applied to the speaker, The linear roll 21s first causes the "edge tension" phenomenon. Therefore, a margin is left in the tinsel wire attached to the arc roll 21c, and this A wiring structure has a so-called fail-safe wiring structure that protects the tinsel wire from tension. It can be said that the wiring structure is extremely sophisticated.

On the other hand, looking at the B wiring structure, it is unsuitable for adopting a wiring structure having a fail-safe function in which tension is not applied to the tinsel wire at the time of excessive input. For example, in order to secure a predetermined stroke and to protect the flat knitted tinsel cord 1h mounted on the linear roll 21s from being applied with tension, the width of the arc roll 21c must be narrower than the width of the straight roll 21s. When the width of 21c is narrowed, the compliance of the circular arc roll 21c portion becomes lower (harder), and the linear roll 21s and the circular arc roll 21c
It is expected that the price of the vibration will change extremely and the diaphragm 3 will not uniformly oscillate.

Therefore, in order to prevent tension from being applied to the flat knitted tinsel cord 1h mounted on the linear roll 21s even if an excessive input is applied, it is necessary to secure an edge stroke equal to or larger than the predicted excessive input. Become. However, in order to do so, the only way to widen the width of the linear roll 21s is from the current state. When the linear roll 21s is widened, the elongated shape is adversely affected as described above, and the wider the width is, the farther from the elongated shape. As a result, the slender shape becomes a speaker shape that does not fit the required space at all.

An object of the present invention is to reduce the sound pressure without damaging the thin and elongated shape as much as possible and to use a heavy input conductor having a large input capacity, that is, a 13-piece flat braided tinsel wire or the like. Moreover, it is an object of the present invention to provide a flat speaker having a fail-safe function that withstands a larger amplitude than that of a conventional speaker and protects an input conductor from tension even when an excessive input signal is applied to the speaker. .

[0044]

In order to achieve the above-mentioned object, the flat type speaker according to claim 1 is arranged such that two magnets are arranged such that the same poles face each other and a magnetic material is provided between both magnets. It has a repulsive magnetic circuit configured to sandwich a center plate consisting of and to form a magnetic field due to repulsive magnetic flux on the outer periphery of the center plate. A vibration plate having a substantially flat plate shape is joined to the portion, and a roll portion longer than the length of the cross section of the roll of the edge provided on the outer peripheral portion of the vibration plate is formed on the conductor wiring sheet, and input is made along the roll portion. A wire is attached to form a molded body with a conductor, and the molded body with a conductor is mounted on the diaphragm.

The flat speaker according to claim 2 is
Two magnets are arranged so that the same poles face each other, and a center plate made of a magnetic material is sandwiched between both magnets to form a magnetic field by a repulsive magnetic flux on the outer periphery of the center plate. It has a magnetic circuit and arranges the voice coil in the magnetic field around the center plate, and a substantially flat diaphragm is joined to the outer periphery of the voice coil, and a cross section of an edge roll provided on the outer periphery of the diaphragm. Roll part that is longer than the length of
It has a roll part provided across the roll of the edge so as to bridge it, and an input wire attached so as to follow the roll part, and both ends are provided with a molded body with a conductor attached to the diaphragm and the edge. ing.

Since the flat speaker according to claim 1 or 2 has the above-mentioned shape, the movable range (stroke) of the roll of the molded body with conductor is always greater than the movable range (stroke) of the edge roll portion of the speaker. become longer. Therefore, even if a heavy input conductor having a large input capacity, that is, a 13-piece flat braided tinsel wire, etc. is used, the sound pressure is not lowered, and the sound pressure is not reduced more than the conventional speaker. The flat speaker has a fail-safe function of withstanding a large amplitude and protecting the input wire from tension even if an excessive input signal is applied to the speaker.

According to a third aspect of the present invention, the flat type speaker according to the first or second aspect is provided with a plurality of repulsive magnetic circuits arranged at predetermined intervals,
The diaphragm is driven at multiple points by each voice coil arranged corresponding to each repulsive magnetic circuit, and the molded body with a conductor is cut off between the input lines to form a space. Therefore, the elongated shape of the speaker can be realized, and the weight of the adhesive that attaches the input line to the diaphragm can be reduced.

The invention according to claim 4 is the same as claim 1,
In the flat-type speaker according to 2 or 3, the input wire has a plurality of flat knitted tinsel wires attached thereto, and the conductor wiring sheet has a base material portion corresponding to the outer periphery of the flat knitted tinsel wire cut off in an arbitrary shape. I am trying to do it. As a result, the wire is flexible, has excellent resistance to bending, is hard to break, and has a cut hole through which the flat knitting tinsel wire projects, so that the soldering process is easy and the mounting is strong.

The invention described in claim 5 is the same as claim 1,
In the flat-type speaker described in item 2, 3 or 4, the attachment margin portion provided on the outer side portion of the molded body with conductor is attached to the attachment margin portion provided on the outer side portion of the edge.
As a result, the molded body with the conductor is integrated with the vibration system component.

[0050]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a speaker wiring structure according to the present invention will be described with reference to FIGS. The speaker according to the present embodiment employs the same components as those of the above-described planar multipoint drive type speaker.
Therefore, the frame 7, the magnetic circuit parts Magnets RM1 and RM2 and the center plate RM3, which form the speaker, the diaphragm 3 of the vibration system parts, the edge 2 and the voice coil 4 are the same as those described above. And the detailed description thereof will be omitted.

The most different point of the speaker of this embodiment from the planar multi-point drive type speaker described above is that it has the molded body with conductor 1. First, this molded body with conductor 1
How to get. First, a general commercially available phenol resin stock solution is diluted with methanol to obtain a phenol resin solution having a specific gravity of 0.93. Next, a woven fabric called CO # 1200 is depped into the solution and impregnated or coated with a phenol resin. The woven fabric is made of what is generally called Conex fiber, and is made by weaving the double twisted Conex fiber of count 30 at 38 fibers per inch in both length and width.

Further, the woven fabric after the depping was removed from the resin tackiness by volatilizing a methanol solvent, cut into a width of about 150 mm with a slitter and wound into a roll.
Completed as a base fabric B for molding. Then, as shown in FIG. 1, 60 mm (pitch 120 mm) on both sides from the center line in the width direction of the molding base fabric B to be a conductor wiring sheet,
Moreover, the square holes BH are provided at predetermined intervals in the length direction (roll winding direction). As the input conducting wire, a set of 13 flat knitting tinsel wires 1h similar to the one shown above is used, and the flat knitting tinsel wires 1h are also 60 mm on both sides from the center line of the woven fabric.
Three pieces are sewn in parallel at the positions divided into (pitch 120 mm).

The thread for sewing is Conex # 40, as in the case shown above.
Since h is wider than the set of 7 flat knitted thread lines 1h, when the flat knitted thread line 1h is sewn on the base cloth with only one sewing thread like the 7 set of flat knitted thread lines 1h The width end of the knitted tinsel wire 1h floats, and when the amplitude occurs, the end and the base fabric B come into contact with each other to generate an abnormal sound. Therefore, as shown in FIGS. 1 and 2, one flat knitted tinsel wire 1h is sewn by using two threads to improve the adhesion of the width end of the flat knitted tinsel wire 1h to cause abnormalities. It prevents the generation of sound.

As described above, the flat knitting tinsel cord 1h is arranged and sewn at the same intervals as the square holes BH provided in the base fabric B.
Therefore, at the time of sewing, as shown in the figure, a part of the flat knitting tinsel wire 1h is arranged so as to cross the square hole BH provided in the base fabric B, and the square hole BH is bisected by the flat knitting tinsel wire 1h. And another hole BH1
The base fabric B on which the flat knitted tinsel wire has been sewn is obtained.

The base fabric B with the flat knitted tinsel wire attached is set in a lower die D1 for hot press forming for hot press forming. As shown in FIG. 2, the lower die D1 is provided with a base fabric B having a flat knitting tinsel wire attached thereto.
A guide pin DP for positioning the base cloth is provided at a position corresponding to another hole BH1 which is divided into two parts of the flat knitted tinsel wire 1h. Therefore, when disposing the base cloth B in the lower mold D1, as shown in FIG. 3 (A), another hole BH1 is formed in the guide pin DP.
Insert and install.

The temperature of the molding die is the upper and lower dies D1 and D2.
Both are set to about 200 ° C, the upper mold D2 is lowered to sandwich the base cloth B with the knitted flat braided thread installed on the lower mold D1, and the pressure is about 600 Kg (axial output), press Hot pressing is performed in about 5 seconds. Then, as shown in FIG. 4, the phenolic resin impregnated in the base fabric B is cured, and the base fabric B is
Approximately 150 mm long at a predetermined position in a straight line with a width of 11 m
A roll 11 having m and a radius of 5.5 mm is molded.

After molding, from the lower mold D1, a flat knitted thread line 1h
When the attached base fabric molded product is taken out, the sewn flat knitted tinsel wire 1h is also necessarily formed along the roll portion 11. Then, the conductor-attached molded product B ′ in which the flat knitted tinsel cords 1h (three) are mounted at predetermined positions is released from the molding die. In the case of the present embodiment, after taking out, a rubber adhesive is sprayed on the surface (rear surface) opposite to the surface on which the flat knitted tinsel wire 1h is mounted, and the solvent is volatilized to the back surface of the base material. After providing the adhesive layer, the process proceeds to the trimming process.

In the trimming step, unnecessary portions of the inner side portion and the outer side portion shown by broken lines in FIG. 4 are cut off. In the case of the present embodiment, the flat knitting tinsel wire is used by using a trimming die. The molded product B ′ that has been mounted for 1 h (adhesive-coated) is placed in a punching die and press processing is performed to cut an extra portion, thereby forming a molded body with a conductor 1 having a desired shape as shown in FIG. obtain.

Molded body with conductor 1 obtained through the trimming process
The outer shape of is the shape as shown in FIGS. That is, the molded body with conductor 1 has a long side of 132 mm and a short side of 48 m.
Since each of the attached flat knitting tinsel cords 1h is cut off in a rectangular shape of m, it has a shape of a letter "Sun" when viewed from the front. The conductor-attached molded body 1 is provided on the long side portion.
A bonding margin portion (hereinafter, referred to as “outer bonding margin portion 12”) for adhering to the frame 7 and the like is configured, and the short side portion is configured by the roll portion 11 and the connecting portion.

A roll portion 11 formed further inward from the outer bonding margin portion 12 that horizontally extends 4 mm inward from the outermost portion of the long side portion is arranged.
The shape after trimming is, as shown in FIGS. 4 and 5,
The roll parts 11 are arranged at a total of six places in the vicinity of the upper and lower ends of each outer sticking margin part 12 and in the center part.
The horizontally extending portion extending inward from 1 is a bonding margin portion (hereinafter referred to as “inner bonding margin portion 13”) for bonding to the diaphragm 3. The inner sticking margin portion 13 also serves as a connecting portion with the roll portion 11 provided in each outer sticking margin portion (long side portion) 12. It should be noted that each inner sticking margin portion 13
The base cloth width of the (connecting portion) and the roll portion 11 is 5 mm, and the flat knitted thread line 1
The h is attached.

When trimming is performed, the square hole BH
Ends 1ha, 1h of the flat knitted thread wire 1h arranged above
As shown in FIGS. 4 and 5, b is cut into a predetermined size and shape. A notch 14 is formed around the end of the flat knitted tinsel wire 1h on the outer side of the outer bonding margin 12 which is covered by the respective flat knitted tinsel wire ends 1ha and 1hb. Then, only the end portion of the flat knitted tinsel thread 1h extends from the inner center of the cutout portion 14 in a tongue shape with a length of about 2 mm, as shown in FIGS. 6 (A) and 6 (B). It becomes a state.

Molded body with conductor 1 completed as described above
Is attached to the diaphragm 3 to which the edge 2 is attached.
Each material and each dimension of the diaphragm 3 and the edge 2 are the same as those described above, but the diaphragm 3 is in a state in which the mounting hole 31 of the voice coil 4 is not intentionally opened, that is, in FIG. As shown, the diaphragm 3 in which the voice coil mounting portion is in a planar state (hereinafter, referred to as “coil mounting planned portion 31x”) is used. On the other hand, as the edge 2, the edge 2 to which the flat knitted tinsel wire 1h is not attached is used.

The conductor-attached molded body 1 is mounted on the rear surface side of the edged diaphragm 3. As shown in FIG. 5, the back surface of the molded body with conductor 1 faces the diaphragm 3 side, and the outer bonding margin portion 12 of the molded body with conductor 1 has the outer bonding margin portion 22 of the edge 2.
Are arranged so as to overlap with the straight line portion of the above, and further, the inside attachment margin portions 13 at three places are arranged so as to cross the coil attachment planned portion 31x.

In the case of this embodiment, a die for hot pressing (not shown) is prepared, and the diaphragm 3 with an edge and the molded body with a conductor 1 are placed in the die. Then, the adhesive layer provided on the back surface of the molded body with conductor 1 is thermally reactivated by being sandwiched by the mold and hot-pressed, so that the outer bonding margin portion 1 of the molded body with conductor 1
2 is attached to the straight portion of the outer attachment margin portion 22 of the edge 2, and the inner attachment margin portion 13 of the molded body with conductor 1 is attached to a part of the back surface of the diaphragm 3 and the coil attachment planned portion 31x.

After taking out the diaphragm 3 on which the molded body with conductor 1 is mounted from the mold, the coil mounting portion 31x of the diaphragm 3 is planned.
When a hole is cut by a punching press, as shown in FIG. 5, the inner attachment margin portion 13 adhered to the planned coil attachment portion 31x and the attached flat knitting tinsel wire 1h are simultaneously cut. For this reason, each of the flat knitting tinsel wires 1 h extending in parallel to the inner side bonding margin portion 13 of the three wires is provided with the mounting hole 31 for the voice coil 4.
It is cut to the same size as the diameter of. In this way, the end portion of the flat knitted tinsel thread 1h thus cut is arranged at the same position as the outer circumference of the mounting hole 31. In the present embodiment,
Holes are formed in the coil mounting planned portion 31x of the conductor-formed molded body 1. However, the molded body with a conductor 1 having a shape as shown in the lower diagram of FIG. 5B may be manufactured without drilling.

The method for mounting the voice coil 4 on the diaphragm 3 on which the molded body with conductor 1 is mounted is the same as the method described above. At this time, the wire end portions (the winding start portion and the winding end portion) of the respective voice coils 4 are guided to the end portions 1hc and 1hd of the flat knitted tinsel wire 1h extending to the outer peripheral portion of the voice coil 4, and the respective end portions thereof are guided. Is soldering.

The voice coil 4 and the diaphragm 3 are mounted by the same bonding method as that described above, and each adhesive reservoir provided on the outer peripheral portion of the mounting hole 31 of the voice coil 4 is attached. About 0.16 g of a commonly used acrylic adhesive h is applied to the portion 33 for the purpose. In the case of the present embodiment, when applying the adhesive, the adhesive h is applied so as to cover the soldered portion between the wire end of the voice coil 4 and the end of the flat knitted tinsel wire 1h.

When the adhesive h hardens and reaches the required strength,
The voice coil 4 and the diaphragm 3 are adhesively bonded. Further, the wire end portion of the voice coil 4 and the soldering portion of the end portion of the flat knitted tinsel wire 1h are protectively coated with the adhesive h, and at the same time, the reinforcing effect of the inner bonding margin portion 13 of the molded body with conductor 1 is achieved. As a result, the input lead wire and the wire end portion of the voice coil 4 are extremely firmly fixed to each other. Next, the diaphragm 3 to which the molded body with conductor 1 is attached as described above is attached to the frame 7 by adhesion. The steps from the mounting step to the completion are the same as those shown above.

As described above, the wiring structure of the flat panel speaker according to the present embodiment has a conventional structure (Japanese Patent Laid-Open No. 10-327).
Similarly to the invention described in Japanese Patent No. 491), the flat knitted tinsel wire 1h serves as an input lead wire to the voice coil 4. As shown in the local sectional view of FIG. 7, a flat knitting tinsel wire 1h is attached along the roll portion 11 of the molded body with a conductor 1 formed to be much larger than the roll 21 of the edge 2 as shown in the local sectional view of FIG. There is a point. This difference eliminates the above-mentioned drawbacks and produces a great advantage.

In the above-mentioned embodiment, the molded body with a conductor 1 is arranged on the back side of the diaphragm 3 with an edge, but it is not limited to the back side and may be arranged on the front side. . In addition, the roll portion 11 of the molded body with conductor 1 has
As shown in the enlarged view of FIG. 1, the vibration plate 3 with an edge has an arc shape on the side opposite to the roll 21.
The shape may form an arc in the same direction. That is, FIG.
If it demonstrates using the enlarged view of the said, the roll part 11 of the molded body 1 with a conductor may be made into the shape which forms a convex arc upward.

The roll portion 11 of the molded body with conductor 1 is
It may be mounted so as to draw a curve from the voice coil 4 toward the linear roll 21s of the diaphragm 3 with an edge. That is, the arc may be formed in the plane of the diaphragm 3 with an edge without forming an arc in the vertical direction of the diaphragm 3 with an edge.

Further, the wiring structure of the flat panel type speaker according to the present invention may be applied to a single point driving type speaker in addition to the multipoint driving type speaker. Further, when applied to a multi-point drive type speaker, it may be applied to a speaker having two drive sources or four or more drive sources other than the three-point drive shown in the above embodiment. Further, the attachment margin portion 12 on the outside of the molded body with conductor 1 does not have to be attached to the attachment margin portion 22 on the outside of the edge 2.

[0073]

According to the flat speaker according to the present invention,
Since a molded body with a conductor is used to attach it to the diaphragm, it is easy to create a wiring structure in which the weight added to the diaphragm does not increase even if a heavy-weight set of 13 or more flat knitted tinsel wires is used. Becomes Moreover, since the width of the conventional thin and slender speaker is not increased, and even if the width of the speaker is increased, only the minimum increase in size is required, so that the power can be increased without lowering the sound pressure. Is possible.

Since the cross-sectional length dimension of the roll portion of the conductor-formed molded body is larger than the cross-sectional length dimension of the edge roll,
If the roll movable range (stroke) of the molded body with conductor is always larger than the roll movable range (stroke) of the speaker edge, and the input signal near the amplitude limit of the speaker is applied, the edge roll strokes. Even when the limit is reached, it is possible to leave a margin for the roll portion of the conductor-attached molded body.

Further, the width dimensions of each arc roll and the linear roll can be freely set for compliance adjustment, and the linear roll is "edge tensioned" temporarily.
Even if the phenomenon occurs, the flat knitted tinsel wire mounted on the conductor-attached molded body is not subjected to a strong tension, and it is possible to maintain a state in which there is no effect. There will be nothing.

Further, even when an excessive input exceeding the design value of the speaker is applied, even if the "edge tension" phenomenon of the linear roll occurs, the flat knitted tinsel wire of the conductor-attached molded body has a margin. In addition, it is possible to reliably obtain a fail-safe function of preventing an abnormal sound (bottom hit sound) generated when the bottom of the voice coil hits the bottom of the frame with an excessive stroke.

Further, a molded body with a conductor or an edge,
Since a member that bridges the diaphragm is attached, it is possible to increase the power without compromising the thin shape.
Further, when the outer sticking margin portion of the molded body with a conductor extending to the end portion of the flat knitted tinsel wire is attached to the straight portion of the outer sticking portion of the edge, the molded body with a conductor is integrated with the vibration system component. This is effective in reducing the number of assembly steps when the attached molded body is mounted on the speaker.

[Brief description of drawings]

FIG. 1 is a perspective view showing a molding process of a molded body with a conductor used for a wiring structure of a flat speaker of the present invention, showing states before and after sewing a flat knitting tinsel wire to a conductor wiring sheet (base cloth). It is a figure, (A) is a figure before sewing and (B) is a figure showing after sewing.

FIG. 2 is a view showing a state in which the conductor wiring sheet having been sewn with the flat knitted tinsel wire shown in FIG. 1 is once turned upside down, and then installed in a lower mold for molding, which shows a state immediately before installation in the mold. It is a perspective view.

3A and 3B are perspective views showing a state immediately before and press-molding the flat knitted tinsel wire sewn conductor wiring sheet arranged in the lower molding die shown in FIG. 2 with the upper die, and FIG. It is a figure which shows the state just before, and (B) is a shaping | molding state.

FIG. 4 is a diagram for explaining a situation where trimming is performed on the conductor-attached molded product produced in FIG. 3, and is a perspective view showing a state of being removed from the lower mold and a state of being trimmed.

5 is a perspective view showing a process of mounting the back surface of the molded body with a conductor manufactured in FIG. 4 on the back surface of the diaphragm with an edge and the completion of the mounting.

6A and 6B are perspective views of the molded body with a conductor and the diaphragm to which an edge has been attached, which are produced in FIG. 5, viewed from the front and back, respectively, and FIG. B) is a view seen from the front side.

FIG. 7 is a perspective view of the speaker showing a state in which the molded body with a conductor, the edge and the voice coil-mounted diaphragm manufactured in FIG. 6 are mounted on a frame, and a local portion showing a mounted state of the molded body with a conductor. It is an enlarged sectional view and a partially enlarged perspective view.

FIG. 8 is a perspective view showing an example of an A wiring structure used in a planar multi-point drive type loudspeaker which the applicant is studying for actual production, and is a perspective view showing before and after mounting of a conductive edge and a diaphragm. It is a figure which shows before attachment and (B) shows after attachment.

9 is a perspective view showing a state where the voice coil is bonded to the diaphragm with a conductive edge for the A wiring structure shown in FIG. 8 as seen from the front side and the back side, and FIG. 9A is a view seen from the back side. so,
(B) is the figure seen from the front side.

10A and 10B are perspective views showing a state before and after a conductive edge for A wiring structure and a diaphragm with a voice coil shown in FIG. 9 are bonded to a frame, FIG. 10A being before mounting and FIG. FIG.

FIG. 11 is a planer multi-point drive speaker in which a repulsive magnetic circuit, an input terminal lug, and the like are attached to a frame with a vibration system component (conductive edge, voice coil, diaphragm) for the A wiring structure shown in FIG. FIG. FIG. 6A is a diagram showing a state before the repulsive magnetic circuit is incorporated, and FIG.

12A and 12B are a perspective view and a partially enlarged view for explaining the problems when the conventional B wiring structure is adopted as the wiring structure of the planar multi-point drive speaker, and FIG. 12A is a view seen from the back side. (B) is the figure seen from the front side.

13A and 13B are a perspective view and a partially enlarged perspective view of a planar multi-point driving speaker when the B wiring structure of FIG. 12 is adopted. FIG. 13A shows a state before a wiring material is incorporated, and FIG. It is a figure which shows the state after that.

[Explanation of symbols]

1 Molded body with conductor 11 Roll part of molded body with conductor 12 Outside bonding area of molded body with conductor 13 Inner part of the molded body with conductor (joint part) 1h flat knitting thread line 1ha flat knitting thread end 1hb Flat knitted thread end 1hc Flat knitted thread end 1h Flat knitted thread end 2 edges 21 Edge Roll 22 Edge outside bonding area 23 Edge edge pasting margin 2E conductive edge 3 diaphragm 31 Vibration plate Voice coil mounting hole 31x Diaphragm coil mounting part 31x 32 Vibration plate edge attachment margin 4 voice coils 5 wiring material 5a Wiring material (plus side) 5b Wiring material (minus side) 6 input terminal lugs 61 Input terminal lug, caulking part 6a Input terminal lug (plus side) 6b Input terminal lug (minus side) 7 frames 71 frame pole 72 Frame flange B Conductor wiring sheet (base fabric) BH Square hole for conductor wiring sheet BH1 Separate hole for conductor wiring sheet D1 lower mold for molding D2 Upper mold for molding DP mold guide pin RM repulsive magnetic circuit RM1 magnet (top) RM2 magnet (top) RM3 center plate b screw h adhesive s solder

Continuation of the front page (56) Reference JP-A-10-327496 (JP, A) JP-A-10-327491 (JP, A) JP-A-9-322288 (JP, A) JP-A-2-101897 (JP , A) Actual development Sho 51-83335 (JP, U) Actual development Sho 58-66792 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04R 9/06 H04R 7/04 H04R 9/00 H04R 9/02 102 H04R 31/00

Claims (5)

(57) [Claims] 1. Two magnets are arranged so that the same poles face each other, a center plate made of a magnetic material is sandwiched between the two magnets, and a magnetic field due to repulsive magnetic flux is formed on the outer circumference of the center plate. A planar speaker having a repulsive magnetic circuit configured as described above, wherein a voice coil is arranged in a magnetic field on the outer periphery of the center plate, and a substantially flat diaphragm is joined to the outer peripheral portion of the voice coil. To form a conductor-attached molded body by forming a roll portion that is longer than the cross-sectional length of the roll of the edge provided on the outer peripheral portion of the vibration plate on the wiring sheet and attach an input wire along the roll portion, A flat speaker in which the molded body with a conductor is mounted on the diaphragm. 2. The two magnets are arranged so that the same poles face each other, a center plate made of a magnetic material is sandwiched between the two magnets, and a magnetic field due to repulsive magnetic flux is formed on the outer circumference of the center plate. A planar speaker having a repulsive magnetic circuit configured as described above, in which a voice coil is arranged in the magnetic field around the outer periphery of the center plate, and a substantially flat diaphragm is joined to the outer periphery of the voice coil, A roll part longer than the length of the cross section of the edge roll provided on the outer peripheral part of the plate, and a roll part provided across the roll of the edge so as to bridge the roll, and mounted along the roll part. A flat-type speaker having an input wire, and a molded body with a conductor attached at both ends to the diaphragm and the edge. 3. A multi-point drive is provided with a plurality of said repulsive magnetic circuits arranged at a predetermined interval, and said diaphragms are each said voice coil arranged corresponding to each repulsive magnetic circuit. The flat speaker according to claim 1 or 2, wherein the conductor-attached molded body is formed by cutting off between the input lines. 4. The input wire comprises a plurality of flat knitted tinsel wires attached, and the conductor wiring sheet has a base material portion corresponding to an outer peripheral portion of the flat knitted tinsel wire cut off in an arbitrary shape. The flat speaker according to claim 1, 2 or 3, wherein the flat speaker is provided. 5. The bonding margin portion provided on the outer side portion of the molded body with a conductor is mounted on the bonding margin portion provided on the outer side portion of the edge. The flat speaker according to 3 or 4.