JP3296751B2 - Speaker manufacturing method and speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a speaker in which a repulsion type magnetic circuit is disposed inside a voice coil and a speaker, and more particularly, it is possible to accurately set a clearance between the voice coil and the repulsion type magnetic circuit. The present invention relates to a speaker manufacturing method and a speaker.

[0002]

2. Description of the Related Art We have previously proposed a multi-point drive type speaker having a repulsion magnetic circuit RM. The form of the speaker having the repulsion magnetic circuit RM and the form of the multi-point drive type speaker having the repulsion magnetic circuit RM are roughly classified into those having a magnetic gap and those having no magnetic gap.

First, the outline of the structure of a speaker having a magnetic gap in a repulsion magnetic circuit RM will be described. As shown in FIG. 14, a soft magnetic material such as iron is provided at a certain interval on the outer periphery of a center plate RM3. A ring RM4 is disposed, a magnetic gap is formed between the center plate RM3 and the ring RM41, a magnetic flux is obtained in the magnetic gap, and a voice coil 3 similar to a conventional speaker generally used is provided in the magnetic gap. The diaphragm 2 (cone) is arranged and the movement of the voice coil 3 is
It is a structure to transmit to.

[0004] Next, an outline of a speaker structure having no magnetic gap in the repulsion magnetic circuit RM will be described. As shown in FIG. 15, a voice coil 3 arranged with a certain clearance on the outer periphery of a center plate RM3 is provided. Diaphragm 2
Is mounted by means such as bonding, and the diaphragm 2 (cone) is directly driven. We call the structure a direct drive speaker, but the multipoint drive speaker we proposed is a speaker having the direct drive structure.

When assembling the repulsion magnetic circuit RM, two magnets RM1 and R2 not magnetized are mounted on the center plate RM3.
M2 is mounted and then magnetized, or two unmagnetized magnets RM1 and RM2 are mounted on the center plate RM3 in the same manner as a conventional general speaker, and the magnetic circuit in the non-magnetized state is mounted on a speaker frame. It has already been described in the previous proposal that it is difficult to assemble such a device by attaching vibration system components such as a diaphragm and a voice coil, and magnetizing the speaker after the speaker assembly is completed.

Therefore, we have proposed a method of manufacturing a speaker having the repulsive magnetic circuit RM by using magnets RM1 and RM
In this state, the center plate RM3 is mounted in a state where the magnets 2 are magnetized, the assembly of the repulsion magnetic circuit is completed, and the assembling method of mounting the repulsion magnetic circuit on the speaker frame 1 is proposed.
Further, the inner peripheral portion 31 (reference numeral 31) of the voice coil 3 has a certain clearance at the outer peripheral portion of the center plate RM3.
Has been proposed together with a jig for disposing the jig JS (see FIG. 18) for disposing the jig JS (see FIG. 18) which is generally called a spacer.

The main points of the assembling method are a center plate RM3 which is a magnetic circuit component, and a guide pole portion 11 in which a voice coil 3 which is a driving component is provided on the frame 1.
Is to be assembled and mounted on the basis of For example, FIG.
5. As shown in FIG. 16, a magnet holder 13 having a guide pole 11 made of a non-magnetic material, for example, aluminum or the like is manufactured, and the holder 13 is a portion of the speaker frame 1 generally called a basket portion. Is attached to the bottom portion 12 by caulking or screwing.

Since the outer diameter of the guide pole portion 11 of the holder 13 is finished to a predetermined dimensional accuracy, an assembling jig J1 as shown in FIG. 16 is used, and a voice is provided on the outer peripheral portion of the jig J1. After the coil 3 is inserted and installed, it is inserted into the guide pole portion 11, and a diaphragm and a damper are adhered to the outer peripheral portion of the voice coil 3 to assemble the vibration system components. The jig J1 is withdrawn, and the assembled repulsion magnetic circuit RM after the jig J1 is withdrawn is inserted into the guide pole portion 11 of the magnet holder 13 to complete a speaker.

Since the dimensions of each part of the center plate RM3 of the repulsion magnetic circuit RM after the completion of the assembly are finished to predetermined dimensions, the outer peripheral portion of the center plate RM3 and the voice coil 3 after the repulsion magnetic circuit RM is inserted and mounted. It is possible to obtain a predetermined clearance l between the inner diameter portion and the inner portion as shown in the local enlarged sectional view of FIG. In the case of the speaker having the above-described structure having a magnetic gap, a ring assembling jig similar to the assembling jig J1 is inserted into the guide pole portion 11, and the ring RM4 is attached to the magnet holder 13 by a means such as bonding, and thereafter, Is carried out in the same manner as in the above assembling method to complete the speaker.

The conditions under which the assembling method is established include the inner diameter, outer diameter, and concentricity of the assembling jig J1, the outer diameter of the guide pole portion 11, and the repulsive magnetic circuit R.
The clearance between the inner diameter portion 31 of the voice coil 3 and the outer diameter of the center plate RM3 is provided on condition that the inner diameter, outer diameter, and concentricity of the center plate RM3, which is an M component, are finished within predetermined dimensional tolerances. Is set to 0.2 mm to 0.25 mm as in a general speaker, the dimensional tolerance is 0 to -0.05 mm, preferably 0 to -0.
It must be set to 02 mm.

At present, mass production processing of each part within the dimensional tolerance can be easily performed because it is possible to apply a processing technique that has been proven. When the magnet holder 13 and the speaker frame 1 are integrally molded by means of injection molding or the like as shown in FIG. 17, the outer diameter of the pole guide 11 is about ± 0.1 to 0.2 mm. A difference occurs. Therefore, post-processing is performed in order to be within the above-mentioned dimensional tolerance. However, since the post-processing can obtain the accuracy within the dimensional tolerance only by adding a relatively simple cutting process using a lathe, the cost is significantly increased. Without doing
It is possible to obtain the integrally molded article.

A method of reducing costs by the effect of reducing the number of parts by integral molding is well known. However, in the multi-point drive type speaker, as a condition for keeping the clearance between the center plate RM3 and the voice coil 3 constant, in addition to the dimensional accuracy of the outer diameter of the pole in the guide pole part 11, the interval ( Less than,
Write pitch. ) Dimensional accuracy is a necessary condition.

However, when the frame 1 and the guide pole portion 11 are integrally formed as described above, the diameter of the pole is ± 0.1 to
It is well known that a dimensional difference of about 0.2 mm occurs, and that a similar dimensional error also occurs in the pitch dimension of the guide pole section 11.
When the frame 1 and the frame 1 are integrally formed, it is extremely difficult to obtain the dimensional tolerance as described above.

Therefore, even if cutting is performed to keep the pole outer diameter and the pitch dimension of the guide pole portion 11 after integral molding within the dimensional tolerance, the cutting by a conventional lathe from a structural point of view. Cannot be performed, and cutting by a milling machine is required. Generally, milling machine processing is more expensive than lathe processing, and since it is a multi-point drive type, the number of guide poles 11 is large, so that the number of cutting points increases, and naturally, the number of cutting steps increases and the cost increases. It becomes a factor of up.

Further, when the diameter of the guide pole portion 11 is reduced, the strength of the pole portion 11 cannot be stopped by the cutting resistance, and when cutting is performed at a generally used processing speed, so-called chatter is generated. Since it is impossible to obtain the dimensional accuracy, a situation where the processing speed is extremely slowed down or a situation where it is impossible to obtain a predetermined accuracy even if the processing speed is slowed down also occurs. In particular, it is well known that this phenomenon easily occurs in an integrally molded product made of resin.

However, it is clear that the greater the number of the guide poles 11, the more the effect of integral molding is obtained. In addition, assembling of the multi-point drive type speaker after molding without performing post-processing such as cutting. Is more preferable if possible, as a method for achieving the object,
The center plate RM3 of the repulsion magnetic circuit RM is applied by applying the speaker assembling method having the conventional general magnetic circuit.
A method of assembling based on the outer circumference of the device can be easily considered.

An outline of a typical assembling method of the conventional example will be described. As shown in FIG. 18, a jig JS generally called a spacer is inserted into an outer peripheral portion of a pole of a yoke Y which is a magnetic circuit component. The inner peripheral portion of the voice coil bobbin 32 is inserted and mounted on the outer peripheral portion of the jig JS, and the inner and outer peripheral portions of the spacer JS have a thickness of 0.2 mm to 0.2 mm.
A coil having a thickness of 5 mm is arranged at a predetermined position on the outer periphery of the yoke with a certain clearance (0.2 mm to 0.25 mm).

Therefore, an example of assembling a multi-point drive type speaker having a repulsion magnetic circuit RM by applying the above-described assembling method of the prior art will be described with reference to FIGS. The multi-point drive type speaker has an elongated shape in which the aspect ratio of the diaphragm 2 is about 6: 1 as shown in FIG. 1, and the diaphragm 2 is composed of three voice coils 3 and three sets of repulsive magnetic circuits. This is an elongated multipoint drive type (direct drive type) speaker driven by RM.

First, as shown in FIG. 19, the assembled repulsion magnetic circuit RM is fixedly attached to the guide pole portion 11 integrally formed with the frame 1 by a method such as bonding or screwing with a screw b. The repulsion magnetic circuit R
Insert the inner periphery of the spacer JS with the coil mounted on the outer periphery of the center plate RM3 of the M into the outer periphery of the center plate RM3, and place the voice coil 3 at a certain clearance (0.2 m).
m to 0.25 mm).

Through the above-described assembling process, the voice coil 3 is set with reference to the outer peripheral portion of the center plate RM3.
After a predetermined clearance is ensured, the adhesive h is further applied to a predetermined position on the outer peripheral portion of the frame 1 to mount the voice coil 3 provided on the diaphragm 2 as shown in FIG. While the insertion hole 21 is inserted into the outer peripheral portion of the voice coil 3, the sticking portion 41 provided on the outer peripheral portion of the edge 4 is arranged on the adhesive h application portion on the outer peripheral portion of the frame 1, and the pressure is fixed (pressing and fixing Further, a method of applying an adhesive h to a contact portion between the outer peripheral portion of the voice coil 3 and the diaphragm hole 21 and curing the adhesive h, and performing a wiring operation to complete a speaker. There is.

However, the method is based on the repulsion magnetic circuit RM
This is a basic assembling method similar to a conventional general speaker having no, and therefore has the conventional disadvantage as it is. That is, this is a disadvantage that the position of the voice coil 3 installed on the spacer JS is easily shifted. Spacer JS
It is well known that the ability to hold the position of the voice coil 3 mounted on the main body is mainly maintained by both frictional forces.

A conventional speaker having a general magnetic circuit, or a speaker using a repulsion magnetic path RM having a magnetic gap proposed by us, drives the voice coil 3 in the magnetic gap, and moves the voice coil. To the diaphragm 2 via a voice coil bobbin 32 (hereinafter, referred to as a bobbin 32), the voice coil 3 has a structure in which a coil wire is wound around the lower end of the bobbin 32 as shown in FIG. 18 or FIG. Has become. Therefore, since the outer peripheral portion of the spacer JS is inserted into the inner peripheral portion of the bobbin 32, the holding force in installing the voice coil 3 is naturally due to the frictional force with the outer peripheral portion of the spacer JS and the inner peripheral portion of the bobbin 32. is there.

Moreover, the inner peripheral portion of the bobbin 32 and the spacer J
Since the contact area with the outer peripheral portion of S is large, the frictional force increases,
When the coil 3 is installed by inserting the bobbin 32 into the spacer JS, it has a structural advantage that it is hard to be shifted from a regular position. However, this structure is basically a structure in which, when an external force exceeding the frictional force necessary for holding the bobbin 32 is applied to the bobbin 32, the position where the voice coil 3 is installed can be shifted from a predetermined regular position. Is well known.

In particular, the external force is often generated when the diaphragm 2 (cone) is mounted, and the cone neck 21 is attached to the bobbin 32.
When inserted into the outer peripheral portion, the neck portion 21 comes into contact with the bobbin 32, and a force is applied to push down the bobbin 32, and the pushing force is too strong.
It is also well known that the amount of friction exceeds the frictional force that can be held at a given time, and that the position at which the spacer JS of the voice coil 3 is shifted below the normal position is generated.

However, the repulsion magnetic circuit R we proposed
The multi-point drive type speaker having M is more preferably a bobbin-less structure. Even if the bobbin 32 is provided, it is sufficient that the bobbin 32 has a very short length.
As shown in FIG. 2, the contact portion between the substantial inner portion 31 of the voice coil (the reference numeral 31 is shown in FIG. 13) and the outer peripheral portion of the spacer JS is a contact portion of only the winding portion of the voice coil 3, and the contact area is small. It is clear that the number is much reduced as compared with the conventional example.

Therefore, when the inner diameter portion 31 of the voice coil 3 for the multi-point drive type speaker having the repulsion magnetic circuit RM is inserted into the outer peripheral portion of the spacer JS and installed at a regular predetermined position, the spacer JS is It is expected that the frictional force required to hold the voice coil 3 is also reduced, and the position of the voice coil 3 is naturally moved by a small external force.
Moreover, it turned out that the external force required to move was weaker than we expected.

Further, as shown in FIG. 21, a multi-point drive type speaker diaphragm 2 has a plurality of holes 21 for mounting a plurality of voice coils 3.
It is almost impossible to insert the plurality of holes 21 without contacting the outer periphery of the voice coil 3 when the diaphragm 2 is mounted, and it is inevitable that any one of the holes 21 contacts or catches. In this case, a force for pushing down the voice coil 3 is applied, and the voice coil 3 is moved by a small amount of external force as described above. Therefore, it has been found that the positional displacement of the voice coil 3 easily occurs.

As is well known, a multi-point drive type speaker is based on the premise that the positions of the plurality of voice coils 3 mounted on the diaphragm 2 are accurately arranged with respect to the magnetic circuit. Therefore, in the above-described assembling method, the position of the voice coil 3 moves from the normal position, that is, the normal position of the outer peripheral portion of the center plate RM3 in the direction of the arrow shown in the locally enlarged sectional view of FIG. The positions of the plurality of voice coils 3 are varied, and if mass production is carried out, naturally a speaker with reduced performance or a defective speaker will be produced.

In the conventional method using the general spacer JS, the voice coil 3 is fixed to the center plate RM3 by the spacer JS for a certain period of time when the adhesive h for bonding the edge 4 and the voice coil 3 hardens and reaches the required strength. Must be accurately installed on the outer periphery of the
Moreover, since the holding force of the spacer JS is extremely weak and the voice coil 3 moves with a small amount of external force, it is preferable that the voice coil 3 be kept stationary as much as possible and left until the adhesive h is cured.

Also, since the speaker is a multi-point drive type speaker, the number of spacers JS used must be multiplied as a matter of course.
At the same time as the cost of the spacer JS increases, the spacer JS used for the repulsion magnetic circuit RM is
As shown in FIG. 22, since the spacer JS1 is installed on the top of the spacer 1, the thinner portion JS1 is larger than the generally used spacer JS. It has drawbacks and requires a space for storage during manufacturing.

Therefore, in a multi-point drive type loudspeaker having a repulsion magnetic circuit RM, the frame 1 and the guide pole portion 11 are integrally molded, and the molded product is used as it is without any additional processing. Similarly to the above, mass production is performed by an assembling method in which the spacer JS is inserted into the outer peripheral portion of the center plate RM3, which is a magnetic circuit component constituting the repulsion magnetic circuit RM, and the voice coil 3 is arranged based on the outer peripheral portion of the center plate RM3. In this case, it is extremely difficult to obtain a stable production yield rate.

Further, when the voice coil 3 is installed on the repulsive magnetic circuit RM by using the spacer JS as described above, the outer diameter of the top of the upper magnet RM1 and the inner diameter of the spacer are reduced due to the structural characteristics of the repulsive magnetic circuit RM. In addition, there is a gap of about 1 mm or more, and it is difficult to obtain a secure installation sensation with a sense of closeness similar to that of a speaker having a conventional general magnetic circuit.

[0033]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a voice coil in which a voice coil is mounted on the outer periphery of a circular hole for mounting the voice coil on the outer periphery of the voice coil and an outer periphery of a center plate of the repulsive magnetic circuit. In a speaker manufacturing method and a speaker in which a predetermined clearance is provided between the voice coil and the speaker, the displacement of the voice coil is prevented, and the clearance between the inner circumference of the voice coil and the outer circumference of the center plate of the repulsion type magnetic circuit is precisely adjusted. That is.

[0034]

The speaker to which the manufacturing method of the present invention is applied has the following (a) to (e). (A) A frame (1) having a pole portion (11) (b) A diaphragm (2) having a circular hole (21) for mounting a voice coil into which the pole portion (11) is inserted (c) A circular shape for mounting a voice coil A voice coil (3) whose outer peripheral side is fixed to the hole (21) (d) An edge interposed between the peripheral portion of the diaphragm (2) and the frame (1) to hold the diaphragm (2) at a neutral position. (4) (e) A center plate (RM3) made of a soft magnetic material is fixed to both sides of the center plate (RM3) with the same poles facing each other with the center plate (RM3) interposed therebetween.
Pair magnet (RM1, RM2) and center hole (RM4)
The center plate (RM3) is provided inside the voice coil (3) with a predetermined clearance provided between the voice coil (3) and the center plate (RM3) while passing through the pole portion (11) in the center hole (RM4). Repulsive magnetic circuit (RM)

According to the speaker manufacturing method of the present invention, the following steps are sequentially provided. -Assemble the diaphragm (2), the voice coil (3), and the edge (4) to the frame (1). -A cylindrical spacer (JS) having a thickness equal to the width of the clearance is inserted into the inner peripheral side of the voice coil mounting circular hole (21). -Insert the repulsion type magnetic circuit (RM) into the inner peripheral side of the cylindrical spacer (JS) while loosely fitting the pole portion (11) in the center hole (RM4). -Repulsive magnetic circuit (R) via cylindrical spacer (JS)
The repulsion type magnetic circuit (RM) is moved to a stable position in the radial direction of the pole part (11) by the springback force from the edge (4) transmitted to the pole part (M). -The repulsion type magnetic circuit (RM) is fixed to the pole part (11). -Pull out the cylindrical spacer (JS) from the pole part (11).

The repulsion type magnetic circuit (RM) has a center hole (RM).
Since it is loosely fitted to the pole part (11) in 4),
It can be appropriately displaced in the radiation direction of the pole part (11). Then, the spring portion force of the edge (4) is applied to the pole portion (11) so that the radially inward force from the edge (4) transmitted through the cylindrical spacer (JS) is substantially uniform in the circumferential direction. ) In the radial direction,
Then, it is fixed to the pole part (11). Therefore,
When the cylindrical spacer (JS) is removed, a clearance having a substantially uniform width is formed in the circumferential direction between the center plate (RM3) of the repulsive magnetic circuit (RM) and the inner periphery of the voice coil (3). .

The speaker of the present invention has the following (a) to (e). (A) A frame (1) having a pole portion (11) (b) A diaphragm (2) having a circular hole (21) for mounting a voice coil into which the pole portion (11) is inserted (c) A circular shape for mounting a voice coil A voice coil (3) whose outer peripheral side is fixed to the hole (21) (d) An edge interposed between the peripheral portion of the diaphragm (2) and the frame (1) to hold the diaphragm (2) at a neutral position. (4) (e) A center plate (RM3) made of a soft magnetic material is fixed to both sides of the center plate (RM3) with the same poles facing each other with the center plate (RM3) interposed therebetween.
Pair magnet (RM1, RM2) and pole (11)
And a center hole (RM4) which is loosely fitted in the center hole (RM4).
In (2), a predetermined clearance is provided between the voice coil (3) and the center plate (RM3) while passing through the pole portion (11), and the repulsion type magnetic circuit (RM) (RM) is disposed inside the voice coil (3). f) Adhesive injected into the clearance (1) between the pole part (11) and the center hole (RM4) of the repulsion type magnetic circuit (RM) to fix the repulsion type magnetic circuit (RM) to the pole part (11) (H)

The center hole (RM) of the repulsion type magnetic circuit (RM)
4) is loosely fitted to the pole portion (11), that is, has a diameter that is appropriately larger than the pole portion (11), so that the repulsive magnetic circuit (RM) is radiated to the pole portion (11) in the radial direction. Move it appropriately and adjust the clearance between the center plate (RM3) and the voice coil (3),
The repulsion type magnetic circuit (RM) can be fixed to the pole part (11). Therefore, the center plate (R
The amount of clearance between M3) and the voice coil (3) can be optimized.

Another speaker according to the present invention has a center hole (RM) instead of the adhesive (h) or in addition to the adhesive (h).
4) The head has a diameter larger than the diameter of 4), and is screwed into the pole part (11), and the upper end surface of the repulsion type magnetic circuit (RM) is pressed by the head, whereby the repulsion type magnetic circuit is connected to the pole part (11). It has a screw (b) for fixing (RM).

A repulsive magnetic circuit (R
In the fixing of M), the joint use of the adhesive and the screw (b) not only strengthens the fixing, but also allows the cylindrical spacer (J) before the adhesive (h) is solidified to exhibit a sufficient fixing force.
Problems can be avoided in the extraction of S) and the processing of the next step. Further, even if the screw (b) is loosened, the adhesive (h) is applied to the pole (11) and the center hole (RM) of the repulsive magnetic circuit (RM).
4), the displacement of the repulsive magnetic circuit (RM) with respect to the pole part (11) can be avoided.

According to the speaker of the present invention, the frame (1) has a plurality of pole portions (11), and the frame (1) and the pole portion (11) are integrally formed.

In a loudspeaker having a plurality of pole portions (11), that is, in a multi-point drive type speaker, the integral molding of the frame (1) and the pole portion (11) depends on the position of each pole portion (11) in the frame (1). Increase accuracy.

According to the loudspeaker of the present invention, the frame (1) and the pole portion (11) are integrally formed of resin.

[0044]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS This embodiment will be described with reference to FIGS. 1 to 13. The reference numerals of the common parts are the same as those of the conventional example. The outline of the speaker in the present embodiment will be described with reference to FIG. 1. The maximum outer dimension of the speaker is 49.6 m in width.
m, a length of 228 mm and a depth of about 20 mm (including a magnetic circuit), and three sets of voice coils 3 comprising a flat and elongated diaphragm 2 having an aspect ratio of about 6: 1. And a thin and slender multi-point drive type speaker driven by the repulsion magnetic circuit RM.

The external dimensions of the diaphragm 2 are 29.4 m in width.
m, length 183 mm, thickness 3 mm, the ends of the long sides are connected by a curve having a radius of 14.7 mm, and have a generally track-like shape when viewed from the front. The material of the diaphragm 2 is pulp. 2, a hole 21 for mounting the voice coil 3 is provided on the center line of the diaphragm 2 as shown in FIG. 2, the diameter of the hole is 17 mm, and the position is one at the center of the diaphragm 2. A total of three places are provided at a position 60 mm from the hole at the center distribution, and a bonding margin 2 having a width of about 4 mm for mounting the edge 4 on the outer peripheral side of the back surface of the diaphragm 2 as shown in the figure.
2 is provided.

The edge 4 is a roll 4r arranged on the outer periphery.
An edge 4 (hereinafter, referred to as a conductive edge 4) on which a conductor is mounted along the same. The woven fabric used as the base material of the conductive edge 4 is a 30-count single-twisted cotton yarn for both the warp and the weft, and is woven at a weaving density of 60 yarns / inch both vertically and horizontally.
A cotton cloth weighing 100 g to 110 g / m 2 is obtained, and the cotton cloth is impregnated with a resin solution having a phenol concentration of 24%.
R, SBR, etc. are coated with a mixed solution, and the rubber-coated cotton cloth is dried with hot air, and then the rubber-coated cotton cloth is cut into a width of about 80 mm with a slitter. To obtain a rubber-coated edge substrate.

A bronze wire (hereinafter, referred to as a flat braided wire) formed by winding a copper wire foil around a fiber as a conductive material at a predetermined position on the base material in an arbitrary number and in a flat knit shape. 13 mm from the center line of the woven fabric B (pitch: about 26 m) with a yarn called Conex # 40.
The sewing was sewed in parallel to the position assigned to m). The flat braided tinsel wire 5 is a tin alloy copper wire having a bus diameter of 0.1 mm and a width of 0.32 m.
m is processed into a 0.027 mm thick foil, and is wrapped in a single layer at a rate of 22 ± 2 times / cm around 200 denier para-aramid fiber, and the braided wire is further braided into seven sets. It is woven into a flat knit at a pitch of 27.45 ± 0.82 mm / time.

The conductor with the conductor sewn was set so that the center line of the substrate was aligned with the center line of the molding die, and a pressure of approximately 600 kg (axial output) was applied to the molding die heated to approximately 200 ° C. When hot pressing is performed for 5 seconds, the phenol resin or the like impregnated in the base material 5 is hardened and a predetermined roll 4
The flat knitted tinsel wire 5 formed in the r-shape and sewn is naturally shaped along the roll 4r, and the roll 4r molded product with the flat knitted tinsel wire 5 is transferred to a trimming process. The unnecessary portions of the inner and outer portions are cut away, and FIG.
The conductive edge 4 as shown in FIG.

The outer diameter of the conductive edge 4 obtained through the trimming process has a length of 202 mm, a width of 48 mm, and a track shape in which the long side and the width are connected by an arc having a radius of 24 mm. The edge 4, facing inward,
And a margin portion 41 having a width of about 3 mm for bonding to the frame 1 is provided at each of the arc portion and the straight portion, and further, a roll portion 4r having a width of 6 mm and a cross-sectional radius of 3 mm is formed inward, and further, A bonding margin 42 having a width of 3 mm for adhering to the diaphragm 2 is provided in the arc portion with a bonding margin 42 having a width of 4 mm in the linear part.

As described above, two flat braided tinsel wires 5 are sewn in parallel at a predetermined interval (about 26 mm).
As shown in the figure, the flat braided tinsel wire 5 is mounted one by one on the surface of each of the inner straight pasting portions 42 in a straight line. Through the end of the arc pasting portion 42 and the roll portion 4r to reach the outer arc pasting portion 41, and one outer arc pasting portion 4
Only the ends 5a and 5b of the flat braided tinsel wire 5 extending to about 1 extend to a length of about 6 mm, and the flat braided tinsel wire 5 becomes a wiring material for supplying an input signal to the voice coil 3. .

The conductive edge 4 is mounted on the diaphragm 2. The mounting method is the same as the conventional mounting method of the vibration plate 2 and the edge 4. An adhesive h is applied to the edge 4 bonding margin 22 of the vibration plate 2, and both bonding margins are bonded by a method such as hot pressing. And attach it. Since the flat braided tinsel wire 5 is sewn to the inner straight bonding portion 42 of the conductive edge 4 as described above, the voice coil is consequently placed along the straight bonding portion 22 of the diaphragm 2. In this state, two wiring members for supplying an input signal to 3 are mounted in parallel.

In the case of the present embodiment, since the pasting portion 22 of the conductive edge 4 is provided on the back side of the diaphragm 2, the pasting portion 42 of the conductive edge 4 is naturally adhered to the back side of the diaphragm 2. At the time of the bonding, the opposite surface on which the flat knitting tinsel wire 5 is sewn is bonded, so that as shown in FIGS. Wiring members for supplying input signals to the two voice coils 3 are distributed to the pasting portion 22 and are mounted along the straight pasting portion 22.

The diaphragm 2 with the conductive edge 4 is set on a jig J2 for assembling the voice coil 3 as shown in FIGS. 3 and 4, and the voice coil 3 is mounted. The outline of the jig J2 will be described. A total of three pole portions J21 for installing the voice coil 3 are arranged at the center point of the center line in the length direction of the jig J2 and at positions separated by 60 mm (tolerance ± 0.02 mm) from the center point. ing. The diameter of the pole portion J21 is 16.21 mm (tolerance: 0, -0.02 mm) and the height is approximately 4 mm, and a stepped portion J22 is provided on the outer periphery of the jig so that the conductive edge 4 of the diaphragm 2 can be accommodated. It is provided.

The voice coil 3 inner diameter portion 31 is inserted into the outer peripheral portion of each of the pole portions J21 for installing the voice coil 3 and ends of the respective voice coil 3 wires (winding start and winding end portions) as shown in FIG. Is set in a predetermined direction. The voice coil 3 used in the present embodiment has a core material of aluminum, and the aluminum wire is generally covered with copper.
A wire called CAW having a conductor diameter of 0.12 mm is used, and a coil inner diameter of 16.23 mm (tolerance 0, +
0.05 mm) Three bobbin-less type voice coils 3 having a winding width of about 3.6 mm, a number of windings of 144, and a number of winding layers of 6 and commonly called air core coils were used.

A hole 21 for mounting the voice coil 3 of the diaphragm 2 is inserted into an outer peripheral portion of the voice coil 3 as shown in FIG. Crawling on the back surface of the diaphragm 2 and leading to a predetermined position of the flat knitting tinsel wire 5 arranged at the pasting portion 22 (edge pasting portion 42) of the diaphragm 2 as shown in FIG. Is soldered to perform connection wiring, and about 0.16 g of an acrylic adhesive h is uniformly applied to the outer peripheral portion of the voice coil 3.

Hole 21 for attaching voice coil 3 of diaphragm 2
The diaphragm 2 and the voice are provided through the adhesive h pool and the hole 21 for mounting the voice coil 3 because the adhesive h pool is formed around the outside and has a slope of about 45 degrees toward the outside. The coil 3 is bonded, but the voice coil 3 coil and the diaphragm 2 are mounted on the assembly jig J2.
There is no displacement between the voice coil 3 and the diaphragm 2 as in the assembly method using the conventional spacer JS.

Further, an adhesive h is applied to the crawling portion of the voice coil wire and the solder portion s, and after the adhesive h applied to the outer peripheral portion of the voice coil 3 hardens and reaches the required strength,
When the diaphragm 2 is removed from the assembling jig J2, the voice coil 3 and the diaphragm 2 are bonded and bonded, and the wiring with the voice coil 3 and the wiring material for input signal supply (the flat knitting wire 5) is completed. The completed voice coil 3 and the diaphragm 2 with the conductive edge 4 are completed.

The voice coil 3 and the diaphragm 2 with the conductive edge 4 are adhered to the frame 1. The frame 1 of the present embodiment is made of ABS resin containing glass fiber and has an outer diameter of 228 mm in length and a width of 49 mm. As shown in FIG. 1, FIG. 5, FIG. 6, etc., at the bottom of the basket portion 12 of the frame 1 at a center of the frame 1 and at a total of three places 60 mm in the length direction from the center. 5mm diameter
(Tolerance: 0, -0.1 mm) A guide pole portion 11 having a height of 14 mm is provided by integral molding, and a 3 mm screw hole (6 m depth) is provided at the center of the top of the guide pole portion 11.
m) is provided.

Further, as shown in the drawing, two holes 15 for attaching input terminal lugs are provided at one flange 14 for attaching the frame 1 provided on the short side of the frame 1. The hole 15 is a square hole 15 having a side of 2.5 mm.
And penetrates from the front surface to the rear surface of the flange portion 14,
The front side of the flange 14 has a diameter of 8 mm and a depth of 1 mm.
A counterbore portion of mm is provided concentrically with the square hole 15, and the pitch size of the hole 15 is the same as the sewing pitch size (26 mm) of the flat braided tinsel wire 5 attached to the conductive edge 4.

The method of bonding the diaphragm 2 according to the present embodiment uses a rubber-based adhesive h on the bonding portion of the edge 4 of the frame 1.
(FIG. 5 shaded portion) is applied, the solvent of the adhesive h is volatilized, and the edge pasting portion 41 is hot-pressed with hot-press dies D1 and D2 (FIG. 8) to remove the adhesive h. FIG. 5 shows a state immediately before being set on the lower mold D2 of the frame 1 to which the adhesive has been applied, by a method of heat reactivation and bonding to the frame 1. Naturally, the lower mold D2 is not heated.

Further, as shown in FIG. 6, a frame on which the adhesive h has been applied is placed on the lower mold D2.
After inserting the hole of the voice coil positioning jig J1 having a structure basically similar to that of the conventional assembly jig described with reference to FIG. The voice coil inner diameter portion 31 of the diaphragm 2 is inserted into the outer peripheral portion of the voice coil positioning jig J1 as shown in FIG. The coil positioning jig basically has a cylindrical shape having a hole having a diameter of 5.05 mm (tolerance 0, +0.03 mm) at the center and an outer diameter of 16.21 mm (tolerance 0, -0.03 mm).
02 mm) brass.

When the diaphragm 2 is inserted, the diaphragm 2 is turned upside down as shown in FIG. 7, the coil wiring portion is arranged on the back side of the diaphragm 2, and the edge 4 is in the up-roll state, and Insert the end of the flat braided tinsel wire arranged on the outside in the direction of the hole for attaching the input terminal lug. When inserted in this state, the sticking portion 4 provided on the outer peripheral portion of the edge 4
1 comes in contact with the adhesive h coating portion.

In the case of the present embodiment, as shown in FIG. 8, the upper die D1 is lowered to press the edge pasting portion 41 provided on the frame 1, and the upper die D1 is heated by the heat of the upper die D1.
The applied adhesive is thermally reactivated from the surface of the first adhesive sheet 1 and a predetermined pressure is applied to the adhesive margin portion 41.
Was adhered to a predetermined position of the frame 11 in an extremely stable state. The temperature of the upper mold D1 is about 200 ° C. and the pressure is about 60.
0 kg (shaft output), press time is about 6 seconds.

At the time of the pressing, the voice coil 3
The flat braided tinsel wire 5 having the conductive edge 4 adhered to the frame 1 and reaching the sticking portion 41 while being accurately arranged at a predetermined position
9 is adhered to the frame 1. After hot-pressing, the coil positioning jig J1 is pulled out as shown in FIG. The frame 1 in which the voice coil 3, the diaphragm 2, and the conductive edge 4 are mounted with the portion 11 disposed is obtained.

When the frame 1 in the above state is taken out of the lower mold D2, the flat knitted tinsel wire ends 5a and 5b for connection with the input terminal lugs 6 are provided with the input terminal lug 6 mounting holes as shown in FIG. 15 counterbore parts are arranged so as to cover about half. Since the copper foil is exposed on both the front surface and the back surface of the end portion of the flat braided tinsel wire according to the present embodiment, the input terminal lug 6 attached to the frame 1 is divided into four equal parts as shown in the local enlarged view of FIG. The flat knitting wire end 5
a and 5b are soldered, and the terminal lug 6 and the flat knit tinsel wire end 5
The connection wiring of a and 5b is completed, and, of course, the connection wiring to the voice coil 3 is also completed.

The terminal lug 6 used in this embodiment is an input terminal lug 6 frequently used in a conventional general speaker, and is commonly called a Faston terminal lug 6 and has a plate thickness of 0.5 mm. It is made by pressing brass and applying nickel plating, etc., at a predetermined position of the lug as shown in the figure, 2.5 mm
A square cylindrical caulked portion having a length of about 3.5 mm and a wall thickness of about 0.5 mm on one side is provided, one of which is shown as a lug 6a on the positive side and the other as a lug on the negative side. Lug 6
b.

The caulking method also employs a terminal lug 6 on a conventional terminal board.
The crimping portion 61 is inserted from the back surface of the frame 1 into the mounting square hole 15 as shown in FIG. Are bent so that each side is divided into four equal parts in the outward direction as shown in the figure, and the input terminal lugs 6 are attached to the frame 1 by caulking.

When the input terminal lug 6 is mounted, a frame (hereinafter, referred to as a frame 1 with a vibration system) in which the connection wiring between the voice coil 3 and the input terminal lug 3 is completed as shown in FIG. 9 is obtained. Pole section 1 of frame 1 with vibration system
1, three repulsion magnetizing circuits RM are attached, and fixedly attached to the outer peripheral portion of the center plate RM3 of the repulsive magnetic circuit RM and the inner diameter portion 31 of the voice coil 3 with a predetermined clearance l. The speaker is completed as a multi-point drive type speaker, and the details will be described below.

The magnets RM1 and RM2 in the repulsion magnetic circuit RM of this embodiment have an outer diameter of 15 mm (tolerance ±
0.2mm), inner diameter 5.1mm (tolerance + 0.2mm,
0), 6 mm thick ring, maximum energy product 38
A neodymium magnet made of Me is used, and the center plate RM3, which is a magnetic circuit component, is made of a commonly used iron plate, and has an outer diameter of 15.83 by press working or the like.
mm (tolerance 0, -0.05mm), inner diameter 5.1mm
(Tolerance: +0.05 mm, 0), 2 mm thick ring-shaped, and galvanized in the same manner as conventional general magnetic circuit components.

The method of assembling the repulsion magnetic circuit according to the present embodiment is as follows. First, as shown in FIG. 10, the inner diameter of the first unmagnetized magnet (hereinafter, referred to as the lower magnet RM2) is formed as follows. Insert the magnetic circuit assembly jig JM into the guide pole JM1 (5 mm in diameter) of the assembly jig JM.
By rotating M1, an acrylic adhesive h is uniformly applied on the upper surface of the lower magnet RM2 by a predetermined amount. After the adhesive h is applied, the inner diameter of the center plate RM3 is inserted into the guide pole portion JM1 of the jig, and the upper surface of the lower magnet RM2 and the lower surface of the center plate RM3 are bonded by pressing.

After the center plate RM3 is bonded, the lower magnet RM2 is removed from the assembly jig, transferred into a magnetizing coil, and magnetized in the thickness direction of the lower magnet RM2 with the center plate RM3 attached. Therefore, the center plate RM depends on the direction of the current applied to the magnetized coil.
Although it is possible to select the magnetic pole of the three bonding surfaces, in the case of the present embodiment, the N pole is used. The lower magnet RM2 with the center plate RM3 and magnetized is again inserted into the guide pole portion JM1 of the assembling jig JM, and the assembling jig JM is rotated, so that the acrylic adhesive h is attached to the upper surface of the center plate RM3. Is applied in a predetermined amount.

Further, a second magnet (hereinafter, referred to as an upper magnet RM1) facing the center plate RM3 is magnetized in the thickness direction in the same manner as described above, and the inner diameter of the magnetized upper magnet RM1 is removed. Is inserted into the guide pole JM1 of the jig JM on which the lower magnet RM2 with the center plate RM3 (which has been magnetized) is installed. At the time of insertion, the lower magnet RM2 installed on the assembly jig is repelled. Magnetic pole surface, in the case of this embodiment,
With the N pole facing the center plate RM3, guide pole J
Insert into M1.

At the time of the insertion, the magnetism of the lower magnet RM2 naturally influences and repels each other, so that the force of repelling the upper magnet RM1 upward or the concentricity of the magnetic pole surfaces of the upper and lower magnets RM1 and RM2 are reduced. If it exceeds the allowable range, a force is generated to move the upper magnet RM1 in the front, rear, left and right directions, that is, in the direction in which the core is shifted. However, as long as the pole JM1 is inserted into the guide pole JM1 of the assembling jig JM, the concentricity of the upper and lower magnets RM1 and RM2 is ensured. Only a rebound force is generated.

If the thickness (plate thickness dimension) of the center plate RM3 is set to an appropriate size immediately before magnetic saturation due to the magnetism provided by the upper and lower magnets RM1 and RM2, the upper magnet RM1 is moved to the guide pole JM1. When the upper magnet RM1 is pushed down in the direction of the center plate RM3 from the upper end thereof, the repulsive force gradually increases as it is pushed down. A magnet RM1 above a predetermined position immediately before contacting the plate RM3, and a center plate RM3;
Mutually generate an attraction force.

The lower surface of the upper magnet RM1 is
And the upper surface of the center plate RM3 is in close contact, and the adhesive is applied to the upper surface of the center plate RM3 as described above.
After a lapse of a predetermined time, the adhesive hardens, and the upper and lower magnets RM1 and RM2 are bonded with the center plate RM3 interposed therebetween. Therefore, when the magnetic circuit RM having been bonded is removed from the assembling jig JM, the same polar surfaces are opposed to each other and the center plate RM3 is sandwiched. As shown in the figure, a hole RM4 having an inner diameter of about 5 mm extends from the upper surface to the lower surface of the magnetic circuit. A set of penetrating repulsion magnetic circuits RM is completed.

The repulsion magnetic circuit RM is mounted on the frame 1 with the vibration system. A predetermined portion is provided on the outer peripheral portion of the center plate RM3 in the repulsion magnetic circuit RM and on the inner diameter portion 31 of the voice coil 3 mounted on the diaphragm. In order to set the clearance l, in the case of the present embodiment, a jig (hereinafter, referred to as an improved spacer JS) as shown in FIGS.

The improved spacer JS has an inner diameter of 15.85 mm.
(Tolerance 0, +0.04 mm), outer diameter 16.21 mm (tolerance 0, -0.04 mm), and a cylindrical spacer JS1 having a height of about 11 mm.
The difference from S is that a flange JS2 is provided on the outer periphery of the upper end of the cylindrical spacer JS1 (FIG. 13).
reference). In the case of the present embodiment, although the flange portion JS2 and the spacer portion JS1 are integrated with a brass cut product,
Only the flange part JS2 uses a cut product, and the spacer part JS1
May be obtained by curling a paper, film, metal foil, or the like having a predetermined thickness on the inner diameter of the flange JS2, or a strip of paper without the flange JS2, Alternatively, it has been found that a sheet-shaped material such as a film, which is appropriately curled, sufficiently satisfies the purpose.

The outer circumference of the spacer JS1 is inserted into the inner diameter 31 of the voice coil 3 as shown in FIGS.
By inserting, the space for the thickness (about 0.18 mm) of the spacer portion JS1 is secured from the voice coil inner diameter portion 31. In the case of the present embodiment, a predetermined amount of an acrylic adhesive is applied to the upper surface of the upper magnet RM1 of the repulsion magnetic circuit RM assembled at that time as shown in FIG. 10, and the adhesive of the upper magnet RM1 is The coating surface faces the frame bottom 12 side, and the hole RM4 of the repulsion magnetic circuit RM is inserted into the guide pole portion 11 of the frame 1 arranged at the center of the voice coil 3.

When inserted, first, the hole RM4 is
Of the center plate RM3 when the lower magnet RM2 is lowered to a predetermined position.
The spacer JS starts to come into contact with the inner diameter portion and is inserted while being in contact with the inner diameter portion of the spacer JS. The clearance dimension provided between the outer peripheral portion of the center plate RM3 and the inner diameter portion of the improved spacer JS is such that the repulsion magnetic circuit hole RM4 is Guide pole part 1
1 is set smaller than the provided clearance dimension, so that the outer peripheral portion of the center plate RM3 is naturally inserted along the inner peripheral portion of the improved spacer JS as a matter of course.

Further, when inserted, the adhesive-coated surface of the upper magnet RM1 of the repulsion magnetic circuit RM (which becomes the bottom surface of the lower magnet RM2 at the time of insertion) comes into contact with the bottom portion 12 of the frame basket portion and is pressed. However, if it is kept in this state, the voice coil 3 is inserted while being moved in a direction deviated to the voice coil 3 by a clearance set in the hole RM4 penetrating the repulsion magnetic circuit RM and the guide pole portion 11 as a matter of course. Then, the edge roll portion 4r via the diaphragm 2
May be deformed.

When the repulsion magnetic circuit RM is fixed in this state, and the improved spacer JS is removed from the inner portion 31 of the voice coil, naturally, the roll portion 4r of the conductive edge 4 is in a normal state. And return to diaphragm 2
, The voice coil 3 also returns to the original position by the amount moved in the biased direction, and as a result, the clearance l between the voice coil 3 and the center plate RM3 does not become uniform. That is, one clearance 1 is wide and the other clearance 1 is narrow, or a part of the voice coil inner diameter part 31 contacts a part of the outer peripheral part of the center plate RM3.

Therefore, in the case of the present embodiment, when the insertion of the repulsive magnetic circuit RM is completed, the improved spacer JS or the repulsive magnetic circuit RM is repeatedly rotated about the guide pole portion 11 so that the edge roll is formed. By using the flexibility (spring back) of the above, the repulsion magnetic circuit RM is minutely moved to return to the normal shape originally possessed by the edge roll portion, and the voice coil inner diameter portion 31 and the outside of the center plate RM3. While the clearance 1 with the diameter portion is made uniform, the clearance set in the hole RM4 of the repulsion magnetic circuit RM and the guide pole portion 11 is intentionally made nonuniform.

That is, the hole RM4 penetrating through the repulsion magnetic circuit RM and the clearance set in the guide pole portion 11 absorb the tolerances of parts and the variations in assembly, and the like. The clearance 1 between the inner diameter portion 31 of the voice coil and the outer diameter portion of the center plate RM3 was made uniform within a desired range. Further, in the case of the present embodiment, a predetermined amount of an acrylic adhesive is applied to the outer periphery of the top of the guide pole 11 at this time, and the adhesive is applied to the clearance 1 between the guide pole 11 and the inner surface of the hole RM4 of the repulsion magnetic circuit RM. h, and the repulsion magnetic circuit RM is immediately fixed.

As described above, a screw hole as shown in FIG. 13 is provided at the top of the guide pole 11 as described above.
As shown in FIG. 1, screw b is fastened to the hole. The fixing screw b is a 3 mm × 5 mm stainless steel binding screw. After fixing each magnetic circuit, the improved spacer JS
Is removed, the spacer portion JS1 provided with the voice coil inner diameter portion 31 as a reference is removed, and the center plate RM3 of the repulsion magnetic circuit RM is removed.
, A voice coil 3 having a certain clearance l can be arranged on the outer peripheral portion, and an elongated shape in which one diaphragm 2 is driven by three repulsive magnetic circuits RM and three voice coils 3. A multi-point drive type speaker is completed.

In the case of this embodiment, in the method of fixing the repulsion magnetic circuit RM, since the adhesive h and the screw b are used in combination as described above, several or at least one improved spacer JS is repeatedly used. It is possible to use. In other words, since the fastening force of the fixing screw b is so strong that it does not depend on the adhesive ability of the adhesive h, the screw b is fastened to a general normal use condition after the screw b is fastened. Immediately thereafter, even if the improved spacer JS is extracted and moved to the next step to perform an operation such as output inspection, there is no problem, so that the repulsion magnetic circuit RM can be fixed with a very small number of the spacers JS. .

On the other hand, when the adhesive h hardens, the screws b
Together with the fastening force of the adhesive h, the adhesive force of the adhesive h is also exerted, the ability to fix the repulsion magnetic circuit RM is further strengthened, and an extremely strong and shocking external force is applied to the multi-point drive type speaker, for example, when we generally use Even when an external force or the like is applied by a similar drop test performed on a normal speaker, the repulsion magnetic circuit RM moves to avoid a situation in which the outer peripheral portion of the center plate RM3 contacts the inner diameter portion 31 of the voice coil. Can be easily performed, and a reliable fixing method can be provided.

Further, in the method of fixing the repulsion magnetic circuit RM only with the adhesive, it is necessary to keep the spacer JS installed while the adhesive h is cured as in the conventional example.
In this fixing method, the magnetic circuit bonding portion 1 of the frame 1 is also used.
2 is coated with a predetermined amount of adhesive h, and is inexpensive sheet-like spacer JS, for example, a sheet or the like having a predetermined thickness is cut into strips and further curled (hereinafter referred to as a sheet). (Referred to as a spacer)).
1 and further, after installing the repulsion magnetic circuit RM, leave it gently until the adhesive is cured, and then remove the sheet spacer after the adhesive is cured.

The sheet spacer, particularly a sheet spacer made of paper or the like, is extremely inexpensive and easy to obtain, so that even when worn out and replaced with a new one, there is no effect in terms of cost at all. Therefore, depending on the purpose of use of the speaker, a fixing method using a combination of a screw and an adhesive,
Even if a fixing method is freely selected and designed, such as a fixing method using only screws or a fixing method using only an adhesive, the manufacturing method has no fundamental influence and it does not matter at all.

This manufacturing method, particularly the frame 1 with a vibration system
By installing an improved spacer JS or the like on the inner diameter portion 31 of the voice coil and mounting the completed and completed repulsion magnetic circuit RM on the frame 1 with reference to the inner diameter portion 31 of the voice coil, a voice like the conventional example is obtained. It is possible to easily manufacture a multi-point drive type speaker in which the displacement of the coil 3 is completely eliminated and the clearance 1 between the center plate RM3 and the voice coil inner diameter portion 31 is constant.

In addition, the basket portion, which has not been possible with a multipoint drive type speaker using the repulsion magnetic circuit RM,
And frame 1 in which guide pole portion 11 is an integrally molded product
In addition, even if mass production is carried out, there is no trouble as in the conventional example, and an extremely large cost reduction can be achieved due to the effect of reducing the number of parts and the need for additional processing.

Further, according to this manufacturing method, the number of jigs and tools for using the inner diameter portion 31 of the voice coil 3 as a reference, that is, the number of spacers JS used is extremely small, or an extremely inexpensive paper sheet is used. Substitutions are possible. Therefore, if the speaker is a multi-point drive type speaker, the number of spacers JS naturally increases and the cost of the jig increases, but the disadvantage can be solved.

[Brief description of the drawings]

FIG. 1 is a front view and a cross-sectional view of a multi-point drive type speaker having an elongated shape and a repulsion magnetic circuit according to the present invention.

FIG. 2 is a perspective view showing a diaphragm and conductive edges of a multi-point drive type speaker having an elongated and repulsive magnetic circuit according to the present invention, as viewed from the back side.

FIG. 3 is a perspective view showing a process of attaching a voice coil to a conductive edge with a diaphragm of the speaker of the present invention.

FIG. 4 is a perspective view showing a process of attaching a voice coil to a conductive edge with a diaphragm of a multipoint drive type speaker according to the present invention, and a completed state of a vibration system.

FIG. 5 is a perspective view showing a state in which an adhesive is applied to a frame of the multi-point drive type speaker according to the present invention and immediately before installation of a lower mold.

FIG. 6 is a perspective view showing a state in which the frame of the multipoint drive type speaker according to the present invention is installed in a lower mold, and a jig for assembling a vibration system is inserted into a frame guide pole portion.

FIG. 7 is a perspective view showing a state in which the inner portion of the voice coil in the vibration system of the multi-point drive type speaker according to the present invention is inserted into the outer peripheral portion of the assembling jig, and the edge application portion is brought into contact with the adhesive application portion of the frame. It is.

FIG. 8 is a perspective view showing a state in which the multi-point drive type speaker according to the present invention is hot-pressed and bonded to an edge application portion and an adhesive application portion of a frame by an upper mold in a vibration system.

FIG. 9 is a perspective view showing a state in which a vibration system component and a frame of the multi-point drive type speaker according to the present invention are bonded to each other, a jig for assembling the vibration system is removed, and an input terminal lug is mounted on the frame with the vibration system. It is a figure and a local enlarged view.

FIG. 10 is a perspective view showing a process of inserting an improved spacer into an inner portion of a voice coil of a frame with an input terminal, and further inserting a repulsion magnetic circuit after completion of assembly, in a vibration system of a multi-point drive type speaker according to the present invention. is there.

FIG. 11 shows a process of mounting an improved spacer on an inner diameter portion of a voice coil of a frame with an input terminal, a vibration system of a multi-point drive type speaker of the present invention, inserting a repulsion magnetic circuit after assembly, and fixing a screw. FIG.

FIG. 12 shows a vibration system of a multi-point drive type speaker according to the present invention, in which an improved spacer is mounted on the inner diameter portion of a voice coil of a frame with an input terminal, a repulsion magnetic circuit after assembly is inserted, screws are fixed, and then an improved spacer is mounted. It is a perspective view which shows the completion state of extracting.

FIG. 13 is a diagram showing a process of mounting a repulsion magnetic circuit on a vibration system and a frame with an input terminal of the multi-point drive type speaker according to the present invention, as viewed from a cross section BB ′ of FIG.

FIG. 14 is a cross-sectional view and a partially enlarged cross-sectional view of a speaker (single-point drive) having a conventional repulsive magnetic circuit and having a magnetic gap in the magnetic circuit.

FIG. 15 is a sectional view and a partially enlarged sectional view of a direct drive type speaker (single-point drive) having a conventional repulsion magnetic circuit and having no magnetic gap in the magnetic circuit.

FIG. 16 is a cross-sectional view showing an assembling process of a direct-drive speaker (single-point drive) having a conventional repulsion magnetic circuit and having no magnetic gap in the magnetic circuit.

FIG. 17 is a cross-sectional view and a partially enlarged view showing a state in which a frame and a guide pole portion of a direct drive type speaker (single point drive) having a conventional repulsion magnetic circuit and having no magnetic gap in the magnetic circuit are integrally formed. It is sectional drawing.

18A and 18B are a cross-sectional view and a local enlarged cross-sectional view illustrating a conventional speaker having a magnetic circuit having a general magnetic gap, in which a spacer is disposed on a yoke and a voice coil bobbin inner diameter part during assembly.

FIG. 19 is an explanatory view applying a conventional general assembling method.
FIG. 6 is a perspective view showing a process of assembling the multi-point drive type speaker having the repulsion magnetic circuit of FIG.

FIG. 20 is an explanatory diagram applying a conventional general assembling method.
FIG. 7 is a perspective view showing a process of assembling the multi-point drive type speaker having the repulsion magnetic circuit of the present invention, in which a spacer in which a voice coil is inserted is arranged at the top of the repulsion magnetic circuit attached to the guide pole portion.

FIG. 21 is an explanatory view applying a conventional general assembling method.
FIG. 9 is a perspective view showing a process of assembling the multi-point drive type speaker having the repulsion magnetic circuit, showing a state in which a spacer in which a voice coil is inserted is arranged on the top of the repulsion magnetic circuit, and then the diaphragm is mounted on the frame.

FIG. 22 is an explanatory diagram applying a conventional general assembling method.
FIG. 7 is a process diagram of assembling the multi-point drive type speaker having the repulsion magnetic circuit of FIG.

[Explanation of symbols]

1 Frame 11 Frame Guide Pole (Pole) 12 Frame Basket Bottom 13 Frame Magnet Holder 14 Frame Flange 15 Frame Input Terminal Lug Mounting Hole 2 Diaphragm 21 Diaphragm Hole, Neck (Circular Hole for Voice Coil Mounting) 3 Voice coil 31 Voice coil inner diameter part 32 Voice coil bobbin 4 Conductive edge 41 Conductive edge pasting part (frame side) 42 Conductive edge pasting part (diaphragm side) 4r Conductive edge roll part 5 Flat knitting wire 5a Flat knitting wire End (positive side) 5b Flat knitted tinsel wire end (minus side) 6 Input terminal lug 61 Input terminal lug caulking section 6a Input terminal lug (positive side) 6b Input terminal lug (negative side) b Screw J1 Vibration Frame Jig J2 Diaphragm Voice coil assembly J21 Diaphragm Voice coil assembly jig pole J22 Diaphragm Voice coil assembly jig step JM Repulsion magnetic circuit assembly jig JM1 Repulsion magnetic circuit assembly jig pole JS spacer (cylindrical spacer) JS1 Spacer thin portion (spacer) JS2 Spacer flange RM Repulsion magnetic circuit RM1 Magnet on repulsion magnetic circuit (magnet) RM2 Magnet under repulsion magnetic circuit (magnet) RM3 Repulsion magnetic circuit center plate (center plate) RM4 Repulsion magnetic circuit hole (center hole) Y Yoke h Adhesive l Clearance s Solder

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ identification symbol FI H04R 9/04 102 H04R 9/04 102 31/00 31/00 B (58) Fields investigated (Int.Cl. ⁷ , DB name) ) H04R 9/06 H04R 9/02 102 H04R 9/04 102 H04R 31/00

Claims (6)

(57) [Claims] 1. A frame (1) having a pole part (11), (b) a diaphragm (2) having a circular hole (21) for attaching a voice coil into which the pole part (11) is inserted, (C) The circular hole (2)
Voice coils (3), (d) whose outer peripheral side is fixed to 1)
An edge (4) interposed between the periphery of the diaphragm (2) and the frame (1) to hold the diaphragm (2) in a neutral position; and (e) a center plate (RM3) made of a soft magnetic material. ) And the center plate (RM3) with the same poles facing each other with the center plate (RM3) interposed therebetween.
A pair of magnets (RM1, RM1,
2) and a center hole (RM4).
A repulsive magnetic circuit disposed inside the voice coil (3) with a predetermined clearance provided between the voice coil (3) and the center plate (RM3) while passing through the pole portion (11). (RM), wherein the diaphragm (2), the voice coil (3), and the edge (4) are assembled to the frame (1), and are equal to the width of the clearance. A thick cylindrical spacer (JS) is inserted into the inner peripheral side of the voice coil mounting circular hole (21), and the repulsion type magnetic circuit (RM) is inserted into the center hole (RM4) at the pole portion (11). Is inserted into the inner peripheral side of the cylindrical spacer (JS) while being loosely fitted to the edge (4) transmitted to the repulsive magnetic circuit (RM) via the cylindrical spacer (JS). Moving the repulsion type magnetic circuit (RM) to a stable position in the radiation direction of the pole part (11) by the springback force of the above; fixing the repulsion type magnetic circuit (RM) to the pole part (11); A method for manufacturing a speaker, comprising removing a cylindrical spacer (JS) from the pole part (11). 2. A frame (1) having a pole portion (11), (b) a diaphragm (2) having a circular hole (21) for attaching a voice coil into which the pole portion (11) is inserted, (C) The circular hole (2)
Voice coils (3), (d) whose outer peripheral side is fixed to 1)
An edge (4) interposed between the peripheral portion of the diaphragm (2) and the frame (1) to hold the diaphragm (2) in a neutral position; (e) a center plate (R) made of a soft magnetic material;
M3) and a pair of magnets (RM1, RM2) fixed to both sides of the center plate (RM3) and the pole portion (11) with the same poles facing each other with the center plate (RM3) interposed therebetween. And a center hole (RM4) for loose fitting.
1) a predetermined clearance is provided between the center plate (RM3) and the voice coil (3) while passing through the center plate (RM3), and a repulsive magnetic circuit (RM) disposed inside the voice coil (3); (F) The pole part (11)
And the pole portion (1) is injected into a clearance (1) between the repulsion type magnetic circuit (RM) and a center hole (RM4) of the repulsion type magnetic circuit (RM).
1) An adhesive (h) for fixing the repulsion type magnetic circuit (RM) to (1). 3. In place of the adhesive (h) according to claim 2,
(F) a head having a diameter larger than the diameter of the center hole (RM4) is screwed into the pole portion (11), and the upper end surface of the repulsion type magnetic circuit (RM) is pressed by the head to thereby press the head; A speaker comprising a screw (b) for fixing the repulsion type magnetic circuit (RM) to a pole part (11). And (g) a head having a diameter larger than the diameter of the center hole (RM4), and screwed to the pole portion (11) to form an upper end surface of the repulsion type magnetic circuit (RM) by the head. The speaker according to claim 2, further comprising a screw (b) for pressing and thereby fixing the repulsion type magnetic circuit (RM) to the pole portion (11). 5. The frame (1) is connected to the pole portion (1).
The speaker according to any one of claims 1 to 4, having a plurality of 1), wherein the frame (1) and the pole portion (11) are integrally formed. 6. The loudspeaker according to claim 5, wherein said frame (1) and said pole portion (11) are integrally formed of resin.