JP2000299897A - Planar speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a planar speaker that causes no sound pressure reduction even when heavy input lead wires such as 13-set flat braid tinsel wires are employed, withstands a higher amplitude than that of a conventional speaker and has a fail safe function to protect the input lead wires from receiving a tension even when an excessively high level input signal is applied to the speaker while not losing a thin profile and thin and long shape to the utmost. SOLUTION: This planar speaker has a repulsion magnetic circuit RM, a voice coil 4 is placed in a magnetic field at an outer circumference of a center plate, a diaphragm 3 formed nearly to be a flat plate is connected to the outer circumferentical part of the voice coil 4, a roll part 11 longer than a length of a cross section of a roll 21 of an edge 2 provided at an outer circumferential part of the diaphragm 3 is formed in a conductor wiring sheet, and input wire 1h is mounted along the roll part 11 to configure a formed body 1 with conductor, which is mounted onto the diaphragm 3. Furthermore, the formed body 1 with conductor has the roll part 11 placed in crossing to bridge over the roll 21 of the edge 2 and the input wire 1h mounted along the roll part 11 and both ends are fitted to the diaphragm 3 and the edge 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar speaker provided with a repulsive magnetic circuit, and more particularly to a wiring structure of a thin and elongated planar multi-point drive type speaker.

[0002]

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

[0003]

The wiring structure and wiring technology of the planar multi-point drive type speaker will be specifically described based on a planar multi-point drive type speaker manufactured on the premise of actual production. Although the speakers shown in FIGS. 3 to 13 are substantially the same as those shown in Japanese Patent Application Laid-Open No. H10-327491, the actual production is taken into consideration, and therefore, there are differences in details. As shown in FIG.
This speaker has a configuration in which three repulsion magnetic circuits RM are arranged at predetermined intervals with respect to an elongated diaphragm 3 and driven at three points.

As shown in FIG. 11, each repulsion magnetic circuit RM has two magnets RM1 and RM2 arranged so that the same poles (N poles) are opposed to each other.
The configuration is such that 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, a thickness of 6 mm, and a maximum energy product of 35 M
e is a 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 a conventional general magnetic circuit component.

The edge 2, which is one of the vibration system components of the speaker, is generally called a cloth edge. The woven fabric used as the base fabric of the edge 2 is a single-twisted cotton yarn for both the warp and the weft, and the weaving density is 60 in both the vertical and horizontal directions.
The raw material is a cotton cloth woven at 100 g / inch and weighing 100 g to 110 g / m @ 2. This cotton cloth has a phenol concentration of 24.
% Resin solution, coated with a solution mixed with synthetic rubber such as NBR, SBR, etc., and dried with a hot air, and then the rubber-coated cotton cloth was slit with a slitter to about 80 mm.
A rubber-coated base fabric cut into a width is obtained.

[0006] At a predetermined position of the rubber-coated base cloth, a flat knitted tinsel wire 1h is formed by arbitrarily arranging an arbitrary number of conductive wires, each of which is formed by winding a copper wire foil around a fiber as an input lead wire, in a flat net shape. Conex # 40, a kind of aramid fiber
Two threads are sewn in parallel at positions distributed 13 mm (pitch: about 26 mm) from the center line of the woven fabric.

The flat braided tinsel wire 1h has a bus diameter of 0.1 mm.
Is processed into a foil of 0.32 mm in width and 0.027 mm in thickness, and wrapped in a single layer at a rate of 22 ± 2 times / cm around a 200-denier para-aramid fiber.
Furthermore, the braided pitch is 27.45 ±
It is woven in a flat mesh at 0.82 mm / time.

Next, the center line of the base cloth on which the flat knitted tinsel wire 1h is sewn is set to a predetermined position of a molding die.
Then, when a pressure of about 600 kg (shaft output) and a press time of about 5 seconds are applied to the molding die heated to about 200 ° C. by hot-pressing, the phenol resin or the like impregnated in the base cloth hardens, and A predetermined roll shape is formed at a predetermined position of the cloth, and the sewn flat knitted tinsel wire 1h is also formed along the roll 21. When the roll molded product with the flat knitting wire 1h is shifted to a trimming process, and unnecessary portions of the inner and outer portions are cut off, the edge 2 (see FIG. Hereinafter, “conductive edge 2E”
That. ) 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 long sides and widths are connected by an arc having a radius of 24 mm. The conductive edge 2 </ b> E further includes a pasting portion having a width of about 3 mm (hereinafter, referred to as “outside pasting portion 22”) in order to adhere the conductive edge 2 </ b> E to the frame 7 from the outermost portion toward the inside. 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 on the straight portion from the outer sticking portion 22 toward the inside. 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 cross-sectional radius gradually larger than those of the straight line portion, and has a maximum width near the arc apex.

Further, a sticking portion having a width of 4 mm (hereinafter, referred to as an "inside sticking portion 23") is provided in the arc portion and the straight portion so as to be bonded to the diaphragm 3 inward from the roll 21 portion. Have been. In addition, as described above, the flat knitting brocade wire 1
h are sewn in parallel at predetermined intervals (approximately 26 mm), and as shown in FIGS. 8 and 9, the flat knitted tinsel wire 1 h is laid on the surface of the linear portion of each inner pasting margin 23. In addition, each of them is mounted one by one in a straight line. Each of the flat knitting tinsel wires 1h is attached so as to reach the arc portion of the outer attaching portion 22 from the straight portion of the inner attaching portion 23 via the end of the arc portion and the roll 21. Then, the end (1
ha, 1hb) is in a state of extending with a length of about 6 mm. For this reason, the flat braided tinsel wire 1h becomes an input conductor to the voice coil 4.

The material of the diaphragm 3 is pulp as a main raw material. The diaphragm 3 has a width of 29.4 m.
m, length 183.4 mm, thickness (depth) 3 mm, with long ends connected by an arc with a radius of 14.7 mm to form a track such as a stadium when viewed from the front . As shown in FIG. 8, the diaphragm 3 is provided with a mounting hole 31 for the voice coil 4 on its center line. The diameter of the mounting hole 31 is 17 mm, and there are three mounting positions, one at the center of the diaphragm 3 and 60 mm on each side of the mounting hole 31 by center distribution. Further, on the outer peripheral portion on the rear surface side of the diaphragm 3, a pasting portion 32 having a width of about 4 mm for mounting the edge 2 is provided.

The method of mounting the conductive edge 2E on the diaphragm 3 is the same as the conventional method of mounting the diaphragm and the edge. That is, the mounting method is such that an adhesive h (hatched portion shown in FIG. 8) is applied to the pasting portion 32 of the diaphragm 3 and the pasting portions 23 and 32 of the edge 2 and the diaphragm 3 are heated and pressed. In this method, the conductive edge 2E is attached to a predetermined position. Since the flat braided tinsel wire 1h is sewn to the straight portion of the inner sticking portion 23 of the conductive edge 2E as described above, the state along the straight portion of the sticking portion 32 of the diaphragm 3 is consequently obtained. Then, the input conductive wire to the voice coil 4 (the flat knitting wire 1
h) is a wiring structure in which two 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.
Are wound on the back surface of the diaphragm 3 and the margin 32 of the diaphragm 3 (edge 2).
Of the flat braided tinsel wire 1h attached to the inner pasting margin 23) of the flat knitting wire 1h, and each end is soldered to perform parallel connection wiring (see FIG. 9).

The mounting of the voice coil 4 and the diaphragm 3 is by adhesion. Specifically, an adhesive reservoir 33 is provided around the mounting hole 31 of the voice coil 4 and has a slope of about 45 degrees toward the outside, and each adhesive reservoir 33 is provided as shown in FIG. Is applied with an adhesive h. 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 adhered to the frame 7 at the outside margin 22 of the edge 2 of the diaphragm 3 as shown in FIG.

The frame 7 is obtained by injection molding an ABS resin containing glass fiber, and has a length of 228 mm and a width of 4 mm.
It has an outer dimension 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 total of three places distributed in the length direction from the center and the center.
A 4 mm pole portion 71 is integrally formed. On one of the frame mounting flange portions 72 provided on the short side of the frame 7, two holes for mounting the input terminal lugs 6 as shown in FIG. 11 are provided.

These two holes are square holes 73 each having a side of 2.5 mm penetrating from the front surface of the flange portion 72 to the back surface, and the front surface side of the flange portion 72 has a diameter of 8 mm.
And a counterbore portion 74 having a depth of 1 mm and being provided concentrically with the square hole 73. The interval between the two square holes 73 is the same as the pitch dimension (26 mm) of the flat braided tinsel wire 1h attached to the edge 2, and the input terminal lugs 6 (commonly called faston terminal lugs) are provided in the square holes 73. A lug made of brass with a thickness of 0.5 mm and subjected to nickel plating by press working is attached by caulking. As shown in FIG. 11, one of the input terminal lugs 6 is a plus lug 6a, and the other is a minus lug 6b.

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

[0018] The thin and elongated flat multi-point drive type speaker is suitable for a limited installation space having a narrow width and an ultra-slim shape and a small depth. For example, even if the speaker installation location is located on the left and right of the screen of a thin television using a plasma display or the like, specifically, a limited (extremely elongated) installation space or the like provided at both ends of the plasma display, This planar multi-point drive type speaker can be mounted, and moreover, functions sufficiently.

As a result of studying the application of such a thin and slender speaker to speakers in other fields, in particular, an in-vehicle speaker and the like, the features and advantages of the ultra-slim and thin and light-weight speaker were found. It has been found that there are many installation locations that can be utilized, and that the application can be sufficiently performed. However, it was also found at the same time that there was a problem to be solved, particularly a problem with the wiring structure.

To explain this problem, the above-mentioned thin, slender, flat, multi-point drive type speaker is designed on the premise of a thin household television, which is a general home appliance, and requires a rated input of 10 W. The requirements are satisfied. However, a speaker used for a vehicle is generally required to have a rated input of about 20 W. When the rated input is doubled, various countermeasures are required, and in particular, it is essential to improve the input resistance of the voice coil 4 and the flat braided tinsel wire 1h as the input conductor, and further, to improve the amplitude resistance.

Then, when various reliability tests were conducted, it was found that the voice coil 4 has a wiring structure in which the three voice coils 4 are connected in parallel as described above, and is basically advantageous for a large input. It was found that there was no problem with the current voice coil 4 even if a rated input test of 20 W was actually performed. But,
The flat knitted tinsel wire 1h in the 20W rated input test is 20W
At which point the wire breakage occurred, and the lack of strength of the seven-piece flat braided tinsel wire 1h used in the speaker became apparent.

As a countermeasure against such insufficient strength, a set of 13 flat braided tinsel wires 1h was tested for a rated input of 20W. That is, the flat knitted tinsel wire 1h was changed to a set of thirteen, and a speaker having the same wiring structure as described above was trial-produced.
When a continuous input test of 0 W was attempted, the test could be cleared. However, when the frequency characteristics of the loudspeaker were measured, it was found that the sound pressure level was reduced in almost all frequency bands as compared with the case where the flat braided tinsel wire 1h was used.

The cause of the decrease in the sound pressure level is the flat knitting wire 1
h is increased from 7 to 13, and the number of sets of kinshi wires is increased.
mm. That is, 7
The width of the tinsel wire, which is twice as wide as that of the main set, extends over the straight portion of the inner sticking portion 23 of the edge 2, so that the sticking portion 23 naturally has a wider width and is bonded to the diaphragm 3. It was determined that the increase in the amount of the adhesive h significantly increased the weight added to the diaphragm 3.

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

Therefore, as a countermeasure against the decrease in sound pressure level by the A-wiring structure using the 13-piece flat braided tinsel wire 1h as described above, the driving side of the vibration system, that is, the driving force of the magnetic circuit is improved. Are taken up as important countermeasures. As a method for improving the driving force, magnet RM1,
It is easy to increase the size of RM2. The magnet RM
As a general method of increasing the size of the RM1 and RM2, there are a size increase in a thickness direction and a size increase in a radial direction.

However, an increase in the size of the magnets RM1 and RM2 causes an increase in weight as well as 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 disadvantage that the unit price per weight (gram) is expensive. Moreover, in the above-described multi-point drive type speaker structure, a total of six magnets are required at three locations, and it is apparent that a slight increase in the size of the magnets RM1 and RM2 leads to a significant increase in the cost of the speaker. It is.

Further, increasing the size of the magnets RM1 and RM2 in the thickness direction is contrary to the reduction in thickness, and increasing the size in the radial direction is not suitable when the size in the width direction is large and giving priority to an elongated shape. It will be. Therefore, any of these methods can be said to be an unsuitable countermeasure method for an in-vehicle speaker that attaches importance to a 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 connected to a voice coil and an input terminal. There is a method of wiring between them, and it is conceivable to adopt this wiring structure. However, the wiring method has a complicated wiring structure, which complicates wiring work.
It has the drawbacks that the assembly efficiency is deteriorated, the number of wiring steps is increased, and the cost is increased.

In addition, the wiring structure has to be arranged by jumping a tinsel wire between the voice coil 4 or the diaphragm 3 and the input terminal. The jumping part of this cord-shaped tinsel wire resonates at the time of large amplitude,
It is well-known that a jump phenomenon occurs and an abnormal sound is generated upon contact with the diaphragm 3. The only countermeasure against abnormal sound generation due to the jumping of the tinsel wire is to increase the space in the back side of the diaphragm 3 and inevitably increase the size of the speaker in the thickness direction. There is a disadvantage that the thin shape, which is one advantage of the type speaker, is greatly impaired.

In addition, various studies were made on whether various wire materials could be used as input lead wires other than the tinsel wire to adopt the wiring structure of the planar multi-point drive type speaker. However, a wire suitable for an input lead wire connected to the voice coil 4 that moves in amplitude from an input terminal fixed to the frame 7 of the speaker,
In other words, a wire material that is bendable and has excellent bending resistance, such as a string, is currently available in the form of a string-like bronze wire or a flat braided bronze wire.
There is no substitute for h.

From the above, it is not appropriate to increase the size of the magnets RM1 and RM2 or to adopt a cord-like tinsel wire as a measure against the decrease in the sound pressure level. As an appropriate countermeasure, a wiring that does not increase the weight added to the diaphragm 3 without impairing the characteristics of the thin and slender loudspeaker and that does not increase the weight of the flat braided tinsel wire 1h or the like having 13 or more heavy sets. It turned out that the structure had to be changed. Therefore, when the conventional "A wiring structure" is not restricted, 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 the thin and slender shape and easy to mount the flat braided tinsel wire 1h and has already been proven in reliability, can be considered. Specifically, multiple (three)
Roll 21h of the flat knitting wire 1h in parallel with the edge 2
(Hereinafter, referred to as a “straight roll 21 s”) and the diaphragm 3 and mounted near the position where the mounting hole 31 of the voice coil 4 provided on the diaphragm 3 can be traversed. . Then, the end portion of the flat braided tinsel wire 1h reaching the outer pasting portion 22 of the edge 2 is connected to the flat knitted tinsel wire 1h or the like as shown in FIG. 13 and another wiring material 5 (5a, 5b), for example.
Wiring is connected with a copper wire or the like having a diameter of 1 mm.
(5a, 5b) and the input terminal lug 6 of the speaker
(A plus-side lug 6a and a minus-side lug 6b) are conceivable.

In the B-wiring structure, unlike the A-wiring structure, the flat braided tinsel wire 1h, which is an input conductor, is mounted on the entire surface of the pasting portion (linear portion) 32 of the diaphragm 3; This is a wiring structure that can be attached only to the local portion of the sticking portion (linear portion) 32 of the diaphragm 3. Therefore, the amount of copper foil of the flat braided tinsel wire 1h added to the diaphragm 3 is greatly reduced, which is extremely effective in reducing the weight added to the diaphragm 3, and actually reduces the sound pressure level. The problem has been resolved brilliantly. However, when a continuous input test with a rating of 20 W is performed,
Disconnection or pseudo disconnection occurred at a point where the regulation was not reached, and it was found that there was a problem in the amplitude resistance performance.

In the continuous input test, although the structure of the conductive edge 2E using the set of 13 flat braided tinsel wires 1h was used, no disconnection of the flat braided tinsel wire 1h was recognized in the A wiring structure, and the B wiring structure was not used. As a result of investigating the cause of disconnection or pseudo disconnection in this case, it was confirmed that the disconnection was caused by the width dimension of the roll 21 of the edge 2.

This will be described below. In the A-wiring structure, B is formed so as to obliquely cross the arc portion of the roll 21 at the edge 2 (hereinafter, referred to as “arc roll 21c”).
In the wiring structure, the flat braided tinsel wire 1h is mounted so as to cross the straight roll 21s at a right angle. Comparing the length of the flat braided tinsel wire 1h, the length of the flat braided tinsel wire 1h attached to the arc roll 21c is necessarily longer than the length of the flat knitted tinsel wire 1h attached to the straight roll 21s. Has become. Further, as described above, the arc roll 21c is used.
Is larger than the width of the straight roll 21s, the larger the dimensional difference, the greater the margin for a large amplitude, and the situation where the A wiring structure is more advantageous than the B wiring structure. It can be said.

Therefore, when an input signal near 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 also applied to the flat knitted tinsel wire 1h mounted on the straight roll 21s. The tinsel wire constituting the flat knitting wire 1h or the like is flexible and extremely tough in bending resistance, but is weak in tensile strength, so that the flat knitting wire attached to the straight roll 21s where tension is generated. Disconnection of the Kinshi wire 1h is considered to be a natural phenomenon.

Although the B-wiring structure can reduce the additional 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. This means that the amplitude of the diaphragm 3 is further increased, and the "edge strut" phenomenon is generated more strongly. For this reason, it is obvious that the flat knitted tinsel wire 1h attached to the roll 21s is promoted to be broken or pseudo-broken.

Accordingly, the flat braided tinsel wire 1h having the B wiring structure is used.
In order to prevent the wire from breaking, it is necessary to increase the width of the straight roll 21s in order to prevent tension from being applied to the tinsel wire, that is, to increase the width to reduce the "edge strut" phenomenon. In order to reduce the "edge strut" phenomenon, an appropriate margin must be expected, and the margin leads to an increase in the width of the straight roll 21s. The straight roll 21s is disposed in the width direction 2 of the speaker.
Because of the presence of the loudspeaker at the location, the increase in the width dimension is doubled, and the slight increase immediately affects the elongated shape, which is not suitable for a 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 straight roll 21s is
It is well known that compliance is high, that is, it is soft because it does not receive a form factor than 1c. In order to adjust the compliance, it is common practice to increase the compliance of the arc roll 21c by increasing the width of the low (hard) arc roll 21c with low compliance, and to make the compliance of the entire edge 2 uniform, This has been done conventionally.

However, looking at the conventional A-wiring structure, since the flat braided tinsel wire 1h is arranged on the arc roll 21c wider than the straight roll 21s, even if an excessive input signal is applied to the speaker, The straight roll 21s causes the "edge strut" phenomenon first. For this reason, a margin is left in the tinsel wire attached to the arc roll 21c, and the A wiring structure is a wiring structure having a so-called fail-safe function that protects the tinsel wire from applying tension. It can be said that it is an extremely clever wiring structure.

On the other hand, the B wiring structure is not suitable 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 protect the flat braided tinsel wire 1h attached to the linear roll 21s from applying tension, the width of the circular roll 21c must be narrower than the width of the linear roll 21s. When the width of the arc roll 21c is reduced, the compliance of the arc roll 21c portion is further lowered (hardened), and the straight roll 21s and the arc roll 21c are reduced.
Is extremely changed, and the diaphragm 3 is not expected to have a uniform amplitude.

Therefore, in order to prevent the tension from being applied to the flat braided tinsel wire 1h mounted on the straight roll 21s even when an excessive input is applied, it is necessary to secure an edge stroke larger than the expected excessive input. Become. However, for that purpose, there is no other way but to widen the width of the linear roll 21 s from the current state. If the width of the linear roll 21 s is widened, the narrow shape is adversely affected as described above. This results in a speaker shape whose slender shape does not fit at all into the required space.

An object of the present invention is to reduce the sound pressure even if a heavy input conductor such as a flat braided braided 13-wire wire is used without impairing the thin and slender shape as much as possible. In addition, it is an object of the present invention to provide a flat speaker having a fail-safe function that withstands a larger amplitude than a conventional speaker and protects an input conductor from applying tension even when an excessive input signal is applied to the speaker. .

[0044]

According to a first aspect of the present invention, there is provided a flat speaker according to the first aspect of the present invention, wherein two magnet nets are arranged so that the same poles are opposed to each other, and a magnetic material is provided between both magnets. A repulsion magnetic circuit configured so as to form a magnetic field due to repulsive magnetic flux on the outer periphery of the center plate by holding a center plate made of A substantially flat diaphragm is joined to the portion, and a roll portion longer than the cross-sectional length of the edge roll provided on the outer peripheral portion of the diaphragm is formed on the conductor wiring sheet, and input is performed along the roll portion. Wires are attached to form a molded body with a conductor, and the molded body with a conductor is mounted on a diaphragm.

The flat speaker according to claim 2 is
Two magnet nets are arranged so that the same poles face each other, and a center plate made of a magnetic material is sandwiched between the two magnets to form a magnetic field due to repulsive magnetic flux on the outer periphery of the center plate. It has a magnetic circuit, a voice coil is arranged in a magnetic field around the center plate, and a substantially flat diaphragm is joined to the outer periphery of the voice coil. Roll part longer than the length of
It has a roll part provided so as to bridge the roll of the edge, and an input line attached along the roll part, and has a molded body with a conductor attached to the diaphragm and the edge at both ends. 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 must always be greater than the movable range (stroke) of the edge roll portion of the speaker. become longer. Therefore, the sound pressure is not reduced even if a heavy input conductor such as a 13-braid flat knitting wire is used, without reducing the thin and slender shape as much as possible. A flat speaker having a fail-safe function that withstands a large amplitude and protects an input lead wire from being tensioned even when an excessive input signal is applied to the speaker.

According to a third aspect of the present invention, there is provided the flat speaker according to the first or second aspect, further comprising a plurality of repulsion magnetic circuits arranged at predetermined intervals.
The diaphragm is driven at multiple points by respective voice coils arranged corresponding to the respective repulsion magnetic circuits, and the molded body with conductor is cut off between input lines so as to form a space. Therefore, the elongated shape of the speaker can be realized, and the weight of the adhesive for attaching the input line to the diaphragm can be reduced.

Further, the invention according to claim 4 is the same as the claim 1,
2. The flat speaker according to 2 or 3, wherein a plurality of flat braided tinsel wires are mounted as input wires, and the base material corresponding to the outer periphery of the flat braided tinsel wire is cut off in the conductor wiring sheet in an arbitrary shape. I am trying to be. Thereby, the wire is flexible, has excellent bending resistance, is hard to be disconnected, and has a cutout from which the flat braided tinsel wire projects, so that the soldering process becomes easy and the mounting becomes firm.

Further, the invention described in claim 5 is the same as that in claim 1,
In the flat speaker according to 2, 3, or 4, the sticking portion provided on the outer portion of the molded body with a conductor is attached to the sticking portion provided on the outer portion of the edge.
Thereby, the molded body with the conductor comes to be integrated with the vibration system component.

[0050]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker wiring structure according to the present invention will be described with reference to FIGS. The loudspeaker in the present embodiment employs the same components as those of the above-described planar multi-point drive type loudspeaker.
Therefore, the frame 7 constituting the speaker, the magnet nets RM1, RM2 and the center plate RM3 as the magnetic circuit components, and the diaphragm 3, the edge 2 and the voice coil 4 of the vibration system components are the same as those described above. And a detailed description thereof will be omitted.

The most different point of the loudspeaker of this embodiment from the planar multi-point drive type loudspeaker described above is that it has a molded body 1 with a conductor. First, this molded article with conductor 1
Will be described. First, a 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 dipped in the solution, and impregnated or coated with a phenol resin. The woven fabric is made of what is generally called connex fiber, and is obtained by weaving a 30-count double-twisted conex fiber at 38 fibers per inch both vertically and horizontally.

Further, the woven fabric after the dipping was removed by volatilizing the methanol solvent to remove the resin tackiness, then cut into a width of about 150 mm with a slitter and wound up in a roll.
It is 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 base fabric B for forming a conductor wiring sheet,
Moreover, square holes BH are provided at predetermined intervals in the length direction (roll winding direction). As the input conductor, the same set of 13 flat braided tinsel wires 1h as described above is used, and the flat braided tinsel wire 1h is also 60 mm on both sides from the center line of the woven fabric.
(Pitch: 120 mm) Three pieces are sewn in parallel at the positions distributed.

The thread to be sewn is Conex # 40 similarly to the above-mentioned thread, but a flat knitted bronze wire 1 of 13 sets is used.
Since h is wider than the flat braided tinsel wire 1h of the seven-piece set, the flat braided tinsel wire 1h is sewn to the base cloth with only one sewing thread like the flat braided tinsel wire 1h of the seven-piece set. The width end of the braided tinsel wire 1h floats, and at the time of amplitude, the end and the base fabric B come into contact with each other, generating an abnormal sound. For this reason, as shown in FIGS. 1 and 2, one flat braided tinsel wire 1h is sewn using two threads to improve the adhesion of the width end portion of the flat knitted tinsel wire 1h and abnormally. Prevents the generation of sound.

As described above, the flat knitting tinsel wire 1h is arranged and sewn at the same interval as the square hole BH provided in the base cloth B.
For this reason, at the time of sewing, as shown in the drawing, a part of the flat braided tinsel wire 1h is arranged so as to cross the square hole BH provided in the base cloth B, and the square hole BH is bisected by the flat knitted tinsel wire 1h. And another hole BH1
The base fabric B having the flat knitted kinshi line sewn thereon, in which the occurrence of occurs, is obtained.

The base fabric B to which the flat knitting tint wire has been attached is placed in a lower mold D1 for hot pressing for hot pressing. 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 the separate hole BH1 bisected by the flat knitting wire 1h. For this reason, when arranging the base cloth B in the lower mold D1, as shown in FIG.
Insert and install.

The temperature of the molding die is determined by the upper and lower dies D1 and D2.
Both are set at about 200 ° C., the upper mold D2 is lowered, the base cloth B with the braided flat tint wire attached to the lower mold D1 is clamped, and the pressure is further increased to about 600 kg (axial output). The hot press is performed in about 5 seconds. Then, as shown in FIG. 4, the phenol resin impregnated in the base cloth B is cured, and the base cloth B is cured.
A straight line with a length of about 150 mm and a width of 11 m
A roll 11 having a radius of 5.5 mm is formed.

After molding, flat knitted tinsel wire 1h from the lower mold D1.
When the base fabric molded product with the attached is taken out, the sewn flat knitted tinsel wire 1h is necessarily molded along the roll portion 11. Then, the molded product with conductor B ′ having the flat knitted tinsel wire 1h (three) attached at a predetermined position is removed from the molding die and taken out. In the case of the present embodiment, after removal, a rubber-based adhesive is further applied to the surface (back surface) opposite to the surface on which the flat knitted tinsel wire 1h is mounted, by spraying, and the solvent is volatilized. After providing the adhesive layer, the process proceeds to a trimming step.

In the trimming step, unnecessary portions of the inner portion and the outer portion shown by broken lines in FIG. 4 are cut off. In the case of the present embodiment, a flat knitting wire is used by using a trimming die. The molded product B ′ having been mounted for 1 h (adhesive applied) is set in a punching die and an excess portion is cut by press working to form a molded product 1 with a conductor having a desired shape as shown in FIG. obtain.

Molded product 1 with conductor obtained through trimming step
Has a shape as shown in FIG. 4 and FIG. That is, the molded body with conductor 1 has a long side of 132 mm and a short side of 48 m
m, and the periphery of each mounted flat braided tinsel wire 1h is cut off, so that it has a substantially "sun" shape when viewed from the front. Then, the molded body with conductor 1 is provided on the long side.
(Hereinafter, referred to as “outside pasting portion 12”), and the short side portion is constituted by the roll portion 11 and the connecting portion.

The roll portion 11 is further formed inwardly from the outer sticking portion 12 extending horizontally with a width of 4 mm from the outermost portion of the long side portion toward the inside.
After trimming, as shown in FIGS. 4 and 5,
Roll portions 11 are arranged at a total of six locations near the upper and lower ends and the center portion of each outer pasting portion 12.
The horizontal extension from the inside toward the inside 1 is a pasting portion for adhering to the diaphragm 3 (hereinafter, referred to as an “inside pasting portion 13”). The inner sticking part 13 also serves as a connecting part with the roll part 11 provided on each outer sticking part (long side part) 12. In addition, each inner pasting allowance part 13
The base cloth width of the (joining portion) and the roll portion 11 is 5 mm.
h is attached.

When the trimming process is performed, the square hole BH
Ends 1ha, 1h of flat knitted tinsel wire 1h arranged above
b is cut into a predetermined shape as shown in FIGS. As a result, a cutout portion 14 is formed around the end of the flat braided tinsel wire 1h on the outer side of the outer sticking portion 12 that is covered by the respective flat braided tinsel wire ends 1ha and 1hb. Then, as shown in FIGS. 6A and 6B, only the end of the flat braided tinsel wire 1h extends from the inner center of the notch portion 14 into a tongue shape with a length of about 2 mm. State.

The molded article with conductor 1 completed as described above
Is mounted on the diaphragm 3 on which the edge 2 is mounted.
Each material and each dimension and shape of the diaphragm 3 and the edge 2 are the same as those described above, but the diaphragm 3 is in a state where the mounting hole 31 of the voice coil 4 is not intentionally opened, that is, as shown in FIG. As shown in the figure, the diaphragm 3 in which the voice coil mounting portion is in a planar state (hereinafter, referred to as a "coil mounting scheduled portion 31x") is used. On the other hand, the edge 2 to which the flat braided tinsel wire 1h is not attached is used.

The mounting position of the molded body with conductor 1 is on the back side of the diaphragm 3 with the edge. As shown in FIG. 5, the back surface of the molded body with conductor 1 faces the diaphragm 3, and the outer pasting margin 12 of the molded body with conductor 1 is attached to the outer pasting margin 22 of the edge 2.
Are arranged so as to overlap with the straight line portion of, and furthermore, three inner pasting portions 13 are arranged so as to cross the coil mounting portion 31x.

In the case of this embodiment, a hot press mold (not shown) is prepared, and the vibrating plate 3 with the edge and the molded body 1 with a conductor are set in the mold. 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.
2 is attached to the straight portion of the outer pasting portion 22 of the edge 2, and the inner pasting 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 attaching portion 31 x.

After the diaphragm 3 on which the molded body with conductor 1 is mounted is removed from the mold, the coil mounting portion 31x of the diaphragm 3
When a hole is formed by cutting and cutting with a press, as shown in FIG. 5, the inner pasting margin portion 13 adhered to the coil mounting scheduled portion 31x and the mounted flat braided tinsel wire 1h are cut at the same time. For this reason, each of the three flat braided tinsel wires 1h extending in parallel to the inner pasting portion 13 is provided in the mounting hole 31 of the voice coil 4.
Cut to the same size as the diameter of Thus, the end of the cut flat braided tinsel wire 1h is arranged at the same position as the outer periphery of the mounting hole 31 as a result. In the present embodiment,
A hole is formed in the coil mounting portion 31x of the molded body with conductor 1. However, the formed body with conductor 1 having a shape as shown in the lower diagram of FIG.

The method of 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 ends (winding start and winding end portions) of the respective voice coils 4 are guided to the ends 1hc and 1hd of the flat braided tinsel wire 1h extending over the outer peripheral portion of the voice coil 4, and the respective ends. Is soldered.

The mounting of the voice coil 4 and the diaphragm 3 is performed by the same bonding method as described above, and the respective adhesive pools provided on the outer peripheral portion of the mounting hole 31 of the voice coil 4 are mounted. About 0.16 g of a commonly used acrylic adhesive h is applied to the portion 33. In the case of the present embodiment, 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 braided tinsel wire 1h when the adhesive is applied.

When the adhesive h hardens and reaches the required strength,
The voice coil 4 and the diaphragm 3 are adhesively bonded. Furthermore, the soldered portions of the wire ends of the voice coil 4 and the ends of the flat braided tinsel wire 1h are protectively coated with an adhesive h, and at the same time, the reinforcing effect of the inner pasting portion 13 of the molded body with conductor 1 is achieved. As a result, the input conductor and the end of the voice coil 4 are extremely firmly fixed. Next, the diaphragm 3 on which the molded body with conductor 1 is mounted as described above is mounted on the frame 7 by bonding. The steps from the mounting step to the completion are the same as those described above.

As described above, the wiring structure of the flat speaker according to the present embodiment is the same as that of the conventional example (JP-A-10-327).
Similarly to the invention described in JP-A-491), the flat braided tinsel wire 1h serves as an input conductor to the voice coil 4. The difference from the conventional example is that, as shown in the local cross-sectional view of FIG. 7, the flat knitted tinsel wire 1h is mounted along the roll portion 11 of the molded body with conductor 1 formed much larger than the roll 21 of the edge 2. It is in a point. This difference eliminates the above-mentioned drawbacks and produces great advantages.

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

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

Further, the wiring structure of the flat speaker according to the present invention may be applied to a single-point drive type speaker other than the multi-point drive type speaker. Further, when the present invention is applied to a multi-point drive type speaker, the present invention may be applied to a speaker having two drive sources or four or more drive sources in addition to the three-point drive described in the above embodiment. Also, the pasting portion 12 outside the molded body with conductor 1 does not need to be attached to the pasting portion 22 outside the edge 2.

[0073]

According to the flat speaker according to the present invention,
Since this is mounted on the diaphragm using a molded body with a conductor, it is easy to provide a wiring structure that does not increase the additional weight to the diaphragm even when a heavy braided tinsel wire of 13 or more sets is used. Becomes Moreover, since the width of the conventional thin and slender speaker does not increase, and even if the width is increased, only a minimum increase in the size is required. Is possible.

Since the cross-sectional length of the roll portion of the molded body with conductor is larger than the cross-sectional length of the edge roll,
When the movable range (stroke) of the roll of the molded body with the conductor is always larger than the movable range (stroke) of the roll at the edge of the speaker, and when an input signal near the amplitude limit of the speaker is applied, the roll of the edge becomes a stroke. Even if the limit is reached, the roll portion of the molded body with a conductor can still leave a margin.

Further, the width of each of the arc rolls and the straight rolls can be freely set for compliance adjustment, and if the straight rolls are "edge-stretched"
Even if this phenomenon occurs, strong tension is not applied to the flat braided tinsel wire attached to the molded body with conductor, and it is possible to maintain a state without any influence, and breakage or pseudo disconnection of the flat knitted tinsel wire will not occur. There will be none.

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

Further, a molded body with conductor or edge,
Since a member for bridging with the diaphragm is mounted, it is possible to cope with an increase in power without losing the thin shape.
Also, when the outer pasting portion of the molded body with conductor extending to the end of the flat knitting wire is attached to the straight portion of the outer margin portion of the edge, the molded body with conductor is integrated with the vibration system component. This is effective in reducing the number of assembling steps when attaching the molded body to the speaker.

[Brief description of the 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 according to the present invention, and showing states before and after sewing a flat knitted tinsel wire on 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 situation in which the conductor wiring sheet on which the flat knitting tint wire shown in FIG. 1 has been sewn is once turned upside down, and then installed in a lower mold, showing a state immediately before installation in the mold. It is a perspective view.

3A is a perspective view showing a state immediately before press-molding a flat knitted tinsel wire-sewn conductor wiring sheet arranged in a lower mold shown in FIG. 2 with an upper mold and a molding state; FIG. It is a figure which shows a state just before, and (B) shows a molding state.

FIG. 4 is a view for explaining a situation in which trimming is performed on the molded product with a conductor manufactured in FIG. 3, and is a perspective view showing a state in which the molded article with a conductor is removed from a lower mold and a state in which trimming is performed.

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

FIGS. 6A and 6B are perspective views of the molded body with a conductor and the diaphragm with an edge mounted thereon, each of which has a voice coil mounted thereon, as viewed from the front and back, respectively, and FIG. (B) is a diagram viewed from the front side.

FIG. 7 is a perspective view of a speaker showing a state in which the molded body with conductor, edges and a diaphragm with a voice coil mounted thereon manufactured in FIG. 6 are mounted on a frame, and a local part showing a mounted state of the molded body with conductor. FIG. 2 is a partially enlarged sectional view and a partially enlarged perspective view.

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

9 is a perspective view showing a state in which a voice coil is adhered to a diaphragm having a conductive edge for an A wiring structure shown in FIG. 8 and viewed 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.

10 is a perspective view showing a state before and after bonding a conductive edge for a wiring structure A and a diaphragm with a voice coil shown in FIG. 9 to a frame, wherein (A) shows a state before mounting and (B) shows a state after mounting. FIG.

FIG. 11 is a plan view of a multi-point drive speaker obtained by mounting a repulsion magnetic circuit, an input terminal lug, and the like on a frame having a vibration system component (conductive edge, voice coil, diaphragm) for an A-wiring structure shown in FIG. It is a perspective view of. (A) is a diagram showing a state before assembling a repulsion magnetic circuit, and (B) is a diagram after assembling.

12A and 12B are a perspective view and a partially enlarged view for explaining a problem when a conventional B wiring structure is adopted as a wiring structure of a planar multi-point drive speaker, and FIG. (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 drive speaker in a case where the B wiring structure of FIG. 12 is adopted, wherein FIG. 13A shows a state before wiring materials are incorporated, and FIG. It is a figure which shows the state after having left.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molded body with conductor 11 Roll part of molded body with conductor 12 Outside sticking part of molded body with conductor 13 Inner sticking part (joining part) of molded body with conductor 1h Flat knitting wire end 1hc Flat knitting wire end 1hd Flat knitting wire end 2 Edge 21 Edge roll 22 Edge outside sticking part 23 Edge inside sticking part 2E Conductive edge 3 Vibrating plate 31 Vibrating plate voice Coil mounting hole 31x Diaphragm coil mounting scheduled portion 31x32 Diaphragm edge pasting margin 4 Voice coil 5 Wiring material 5a Wiring material (positive side) 5b Wiring material (negative side) 6 Input terminal lug 61 Input terminal lug 6a Input terminal lug (positive side) 6b Input terminal lug (negative side) 7 Frame 71 Frame pole 72 Frame flange B Conductor Wire sheet (base cloth) BH Square hole in conductor wiring sheet BH1 Separate hole in conductor wiring sheet D1 Lower mold for molding D2 Upper mold for molding DP Mold guide pin RM Repulsion magnetic circuit RM1 Magnet (upper) ) RM2 Magnet (upper) RM3 Center plate b Screw h Adhesive s Solder

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akihiko Haga 1-954, Shiono, Shimmachi, Mamurokawa-cho, Mogami-gun, Yamagata F-term (reference) in Mogami Electric Co., Ltd. 5D012 AA02 BB03 BC02 CA10 DA02 DA03 FA02 GA01 HA03 5D016 AA04 AA13 EA01 FA01 FA02 GA01 HA06 JA03

Claims (5)

[Claims] 1. A two-magnet arrangement in which the same poles are opposed to each other, and a center plate made of a magnetic material is sandwiched between the two magnets to form a magnetic field due to a repulsive magnetic flux on the outer periphery of the center plate. A flat speaker having a repulsion magnetic circuit configured as described above, wherein a voice coil is arranged in a magnetic field around the center plate, and a substantially flat diaphragm is joined to an outer periphery of the voice coil. Forming a rolled part longer than the cross-sectional length of the edge roll provided on the outer peripheral part of the diaphragm on the wiring sheet and mounting an input wire along the rolled part to form a molded body with a conductor, A flat speaker comprising the conductor-mounted molded body mounted on the diaphragm. 2. Two magnets are arranged so that the same poles are opposed to each other, and a center plate made of a magnetic material is sandwiched between the two magnets to form a magnetic field due to repulsive magnetic flux on the outer periphery of the center plate. A flat speaker having a repulsion magnetic circuit configured as described above, in which a voice coil is disposed in a magnetic field around the center plate and a substantially flat diaphragm is joined to the outer periphery of the voice coil, A roll portion longer than the cross-sectional length of the edge roll provided on the outer peripheral portion of the plate, the roll portion being provided so as to bridge the edge roll, and mounted along the roll portion. A flat speaker comprising: an input wire; and a molded body with conductors, both ends of which are attached to the diaphragm and the edge. 3. A multi-point drive system comprising a plurality of said repulsion magnetic circuits arranged at a predetermined interval and wherein said diaphragm is provided at each of said voice coils arranged corresponding to each of said repulsion magnetic circuits. The flat speaker according to claim 1, wherein the molded body with a conductor is formed by cutting off between the input lines. 4. The input wire is provided with a plurality of flat knitted tinsel wires, and the conductor wiring sheet has a base portion corresponding to an outer peripheral portion of the flat knitted tinsel wire cut in an arbitrary shape. The flat speaker according to claim 1, 2 or 3, wherein the speaker is provided. 5. A bonding part provided on an outer part of the molded body with a conductor is attached to a bonding part provided on an outer part of the edge. The flat speaker according to 3 or 4.