JPH0437640B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of assembling a flat speaker having a flat diaphragm.

[Conventional technology]

Conventionally, the following method is known as a general method for assembling a cone speaker.

That is, as shown in FIG. 1A, first, a magnetic circuit 51 is assembled to the lower end of a frame 50 having an inverted conical cylindrical shape. Next, as shown in FIG. 1B, an annular corrugation damper 52 is fixed to the inner peripheral wall of the frame 50 using an adhesive or the like. Subsequently,
As shown in FIG. 1C, the bobbin 54 wound with the voice coil 53 is inserted into the center hole 52A of the damper 52 using the insertion jig 55, and the voice coil 53 is inserted into the magnetic gap of the magnetic circuit 51. is inserted so that the bobbin 54 and the magnetic circuit 51 are positioned relative to each other. Then, the bobbin 54 is fixed to the inner peripheral wall of the damper 52 using an adhesive or the like. Next, a diaphragm 57 formed by joining an elastic edge 56 to its outer circumferential portion is inserted so that its proximal inner circumferential portion 57A is inserted onto the bobbin 54.
In addition, the edge 56 is installed and fixed to the outer peripheral edge of the frame 50. If the diaphragm 57 is assembled in this way, the diaphragm 57 shown in FIG.
The jig 55 is removed from the bobbin 54 as shown in FIG. Finally, a center cap 58 is attached to the upper end opening 54A side of the bohin 54,
This opening 54A is closed by a cap 58 as shown in FIG. 1E.

This assembly method can also be applied to the assembly of a flat speaker equipped with a flat diaphragm, but when this flat speaker is applied,
As shown in FIG. 2, an opening 61 for bobbin insertion is formed in the diaphragm 60, and the opening 61 is formed separately from the diaphragm 60 to prevent dust from entering the inside of the speaker. It is necessary to install a center cap 62 that serves as a dust cap.

In particular, in the case of a large flat-plate type speaker, the diameter of the opening 61 must be large enough to allow insertion of the large-diameter bobbin 63, which occupies a considerably large area of the diaphragm 60. must be opened. As a result, not only the effective area of the diaphragm 60 is naturally narrowed, but also the piston vibration band is narrowed by assembling the cap 62 made of a material different from that of the diaphragm 60 into the opening 61. This is not preferable because it impairs the characteristics of flat speakers, which have widely excellent acoustic characteristics.

Therefore, as shown in FIG.
3, the diaphragm 60, and the edge 65 are assembled and fixed in advance to the frame 66. Then, as shown in FIG. 3B, the damper 67
is assembled and fixed between the bobbin 63 and the frame 66, and finally a magnetic circuit 68 is attached to the lower end of the frame 66 so that the bobbin 63 is inserted into the magnetic gap of the circuit 68. I'm taking it.

[Problem to be solved by the invention]

By the way, when the above-mentioned speaker is assembled by such a method, it is not necessary to form the above-mentioned opening 61 in the diaphragm 60, so the characteristics of the speaker cannot be maintained. However, in the method of assembling the bobbin 63 to the frame 66 and then to the magnetic circuit 68, the relative positioning of the magnetic gap between the bobbin and the magnetic circuit cannot be performed with high precision. Therefore, the accuracy of assembling parts such as the bobbin 63 and the diaphragm 60 is strict, and many high-precision jigs are used, which naturally increases the number of assembly steps and makes the assembly expensive.

Therefore, the present invention was proposed in view of the conventional situation, and an object of the present invention is to enable a speaker to be assembled easily and with high precision without deteriorating the acoustic characteristics of the speaker. do.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a first step of inserting a bobbin wound with a voice coil into a magnetic gap of a magnetic circuit to which a frame is assembled using an insertion jig; Attach a support jig to the locking part provided on the frame, and
a second step of supporting a flange provided on the bobbin with the support jig to restrict movement of the bobbin in the radial direction; and a second step of restricting movement of the bobbin in the radial direction; After fixing the bobbin to the damper attached to the frame, a third step of removing the insertion jig from the bobbin, fixing the flat diaphragm to the frame, and fixing the diaphragm and the bobbin. a fourth step of attaching the diaphragm to the bobbin via a connecting member that connects the diaphragm to the bobbin; and after the diaphragm is fixed to the frame and the bobbin, removing the support jig from the frame and supporting the bobbin; and a fifth step of releasing the flat speaker.

[Effect]

The method for assembling a flat plate speaker according to the present invention positions the bobbin at a predetermined position within a magnetic gap of a magnetic circuit by supporting a flange provided on the bobbin with a support jig attached to a frame. The diaphragm is held in this held state, and the diaphragm is fixed to the frame and bobbin.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described based on the drawings.

Fig. 4 is a partially cross-sectional exploded side view of a flat speaker to which the present invention is applied, Fig. 5 is an enlarged cross-sectional view of the magnetic circuit portion, and Fig. 6 is an enlarged external view of the frame portion. FIG.

A magnetic circuit 1 used in this speaker includes a yoke 3 with a center pole 2 erected thereon, an annular magnet 4 installed on the yoke 3 so as to insert the center pole 2 therein, and a ring-shaped magnet 4 installed on the yoke 3 so as to insert the center pole 2 thereinto. It consists of a sub-plate 5A placed above and a top plate 5B placed opposite to this sub-plate 5A to form a magnetic gap G.

In addition, a frame 6 that directs a diaphragm 15, which will be described later, is also provided.
connects an annular lower frame 7 assembled and fixed onto the top plate 5B, an annular upper frame 8 having a diameter larger than the diameter of the lower frame 7, and these frames 7 and 8. It is made up of a plurality of connecting frames 9, four in this embodiment, and the whole is formed into an inverted conical cylinder shape. According to the frame 6, the aperture ratio of the rear surface of the drive plate 15 is increased, the air resistance on the rear surface can be kept small, and the characteristics of the speaker can be stabilized.

Furthermore, arc-shaped reinforcing frames 10 are arranged between each of the connecting frames 9, respectively. Each of these reinforcing frames 10 is provided with a locking portion 11 formed as a concave notch for positioning and attaching two supporting jigs 23, 23 formed in the shape of a square rod, which will be described later, to a predetermined position. There is.

Further, the bobbin 12 has a voice coil 13 wound around the outer periphery of one end thereof. As shown in FIG. 7, a flange portion 14 is fitted onto the outer periphery of the other end of the bobbin 12 so as to protrude from the bobbin 12 in a direction perpendicular to the axial center. The flange portion 14 is made of, for example, aluminum, synthetic resin, or the like to be thin and lightweight.

The diaphragm 15 includes a core material 16 formed as a honeycomb structure, and skin layers 17 and 18 laminated and fixed to the upper and lower open end surfaces of the core material 16.

Furthermore, a plurality of bobbin connecting pipes 19, four in this embodiment, are fixed to the diaphragm 15 with an adhesive or the like so that the entire bobbin connecting pipe 19 forms an inverted truncated cone shape. Each of the bobbin connecting pipes 19 is assembled and fixed to the bobbin 12 via a ring member 20. That is, each of the bobbin connecting pipes 19 and the ring member 20 that connects these pipes 19 constitute a connecting member that connects the diaphragm 15 and the bobbin 12.

Although not shown, the diaphragm 15 and the bobbin 12 may be connected by an integral cylindrical connection member having an inverted truncated cone shape.

Next, the steps for assembling the speaker will be explained step by step.

First, as shown in FIG. 8, an annular corrugation damper 21 is fixed at a predetermined position in the frame 6 to which the magnetic circuit 1 is assembled and fixed, using an adhesive or the like.

Next, the bobbin 12 is inserted with the insertion jig 22 through the damper 21 and the center hole 21A, which is formed between the top plate 5B and the sub-plate 5A as shown in FIG. Insert it into the magnetic gap G. At this time, as shown in FIG. 10, each reinforcing frame 1 constituting the frame 6
Two supporting jigs 23 are attached and supported in a manner substantially parallel to each other between the locking portions 11 formed at 0, and these two supporting jigs 23 are used to connect the bobbin 12 and the flange. Opposing projecting portions 14A, 14A projecting in the diametrical direction of the portion 14 (seventh
(see figure) is received and supported, and held so that the center of the bobbin 12 coincides with the axis of the center pole 2.

At this time, the bobbin 12 moves in the radial direction, so that the distance l between the lower end outer circumference of the bobbin 12 and the inner circumference of the top plate 5B does not become uneven as shown in FIG. Each of the above supporting jigs 23
The locking portions 11 are arranged so as to sandwich the bobbin 12.
It is positioned accordingly. Therefore, on one side edge of each of the above-mentioned supporting jigs 23, which becomes the bobbin holding part,
By forming an arc-shaped recess that matches the outer peripheral shape of the bobbin 12, the bobbin 12 can be supported more stably.

Then, the bobbin 12 and the damper 21 are fixed together using an adhesive or the like. Incidentally, since the work of bonding the bobbin 12 and the damper 21 can be performed through the opening between the frame 6 and each connecting frame 9, the presence of the flange 14 does not impede the work.

After the bobbin 12 is assembled in this way, as shown in FIG.
Even if the bobbin 1 is removed from the bobbin 12, the bobbin 1
2 is positioned at a predetermined position by each of the supporting jigs 23, so that the accuracy of assembling the bobbin 12 to the magnetic circuit 1 can be maintained.

Next, an elastic edge 24 is fixed to the outer periphery of the diaphragm 15. And the diaphragm 15
is assembled into the frame 6 by placing the edge 24 on the upper frame 24 as shown in FIG. 12, and fitting the ring member 20 constituting the connecting member into the bobbin 12. In addition, the above Edge 2
The ring member 20 and the bobbin 1 are fixed to the upper frame 8 of the frame 6 with adhesive or the like.
2 is also fixed with adhesive or the like.

Finally, each of the supporting jigs 23 is removed from the frame 6, and the support for the bobbin 12 is released.

As described above, the present invention is similar to the conventional method shown in FIG.
2 and the diaphragm 15 can be assembled to the frame 6 one after another from above, making it easy to assemble the speaker. Furthermore, since the bobbin 12 can be held in a predetermined position by the supporting jigs 23 until the assembly is completed,
When assembling the diaphragm 15, there is no need to use a special jig, and the number of jigs can be reduced, resulting in lower costs.

Further, since it is not necessary to form a bobbin insertion hole in the diaphragm 15 as in the conventional case, the acoustic characteristics of the speaker will not deteriorate.

Furthermore, by providing the flange 14 on the bobbin 12, the heat dissipation effect of the voice coil 13 can be improved, and the mechanical strength of the bobbin 12 can also be improved.

As shown in FIG. 13, a ring member 26 having a plurality of protrusions 25 protruding at predetermined intervals in the circumferential direction is fitted onto the outer periphery of the bobbin 12. A part of the protrusion 25 may be supported by a support jig 23 attached to the frame 6 to position and support the bobbin 12.

Further, as shown in FIG. 14, a plurality of cut and raised pieces 27 are formed at the upper end of the bobbin 12 so as to protrude in the outer diameter direction of the bobbin 12, and a part of each of these cut and raised pieces 27 is attached to the frame 12. The bobbin 12 may be positioned and supported by a support jig 23 attached to the bobbin 12.

In addition, as shown in FIG.
8 may be formed. Furthermore, instead of the tape body T, a wire is attached to the bobbin 12.
It may be wrapped around the outer periphery of the material.

Further, as shown in FIG. 16, an annular stepped portion 29 is formed in the middle of the bobbin 12 in the axial direction.
The bobbin 12 may have a configuration in which a large diameter portion 12A and a small diameter portion 12B are combined. In this case, the annular stepped portion 29 serves as a support for each support jig 23 attached to the frame 6. The large diameter portion 12A and the small diameter portion 12B may be formed integrally, or may be formed separately and fitted together to form one bobbin 12.

〔Effect of the invention〕

As described above, according to the present invention, the speaker can be assembled without forming an opening in the diaphragm, so that the acoustic characteristics of the speaker do not deteriorate. Therefore, it is possible to provide a speaker that can fully exhibit its acoustic characteristics. This is particularly effective for large flat speakers.

Further, according to the present invention, the support jig allows
Since the assembly precision between the bobbin and the magnetic circuit can be maintained until the end of speaker assembly, it is possible to provide a speaker with high assembly precision.

Furthermore, according to the present invention, after the magnetic circuit is fixed to the frame, the bobbin, diaphragm, etc. can be assembled to the predetermined positions of the frame, reducing the number of assembly steps and simplifying the speaker assembly process. becomes.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining an example of a conventional speaker assembly method in the order of steps, and FIG. 1A is a partially sectional side view showing a state in which a frame and a magnetic circuit are assembled;
FIG. 1B is a partially sectional side view showing a state in which a bobbin is assembled to the magnetic circuit, FIG. 1C is a partially sectional side view showing a state in which a diaphragm is assembled to the frame;
FIG. 1D is a partially sectional side view showing the bobbin with the bobbin insertion jig removed, and FIG. 1E is a partially sectional side view showing the assembled state. FIG. 2 is an enlarged sectional view of a main part of a flat speaker assembled by the method shown in FIG. FIG. 3 is a diagram explaining the process order of another conventional speaker assembly method, FIG. 3A is a partially sectional side view showing the state in which the diaphragm is assembled to the frame, and FIG. 3B is a diagram illustrating the above-mentioned frame. FIG. 3 is a partially cross-sectional side view showing a state in which the magnetic circuit is assembled. Fig. 4 is a partially cross-sectional exploded side view of a flat speaker to which the present invention is applied, Fig. 5 is an enlarged sectional view showing the magnetic circuit portion, and Fig. 6 is an enlarged perspective view showing the frame portion. , FIG. 7 is an enlarged plan view of the bobbin, FIG. 8 is a partially sectional side view showing how the bobbin is assembled into the magnetic circuit, FIG. 9 is an enlarged sectional view showing the part where the bobbin is inserted into the magnetic circuit, and FIG. 1
Fig. 0 is a partially sectional side view showing a state in which the bobbin is held by a support jig, Fig. 11 is a partially sectional side view showing a state in which the diaphragm is assembled to the frame, and Fig. 1
FIG. 2 is a partially sectional side view showing the assembled state. FIG. 13 is a perspective view of main parts showing another example of a hobbin, FIG. 14 is a perspective view of main parts showing still another example of a bobbin, FIG. 15 is a perspective view of main parts showing still another example of a bobbin, FIG. 16 is a perspective view of main parts showing still another example of the bobbin. DESCRIPTION OF SYMBOLS 1... Magnetic circuit, 6... Frame, 12... Bobbin, 13... Voice coil, 14, 28... Flange, 15... Vibration plate, 19... Bobbin connection pipe constituting a connection member, 20 ...Ring member constituting the connecting member, 22...Insertion jig, 23...
Support jig, 25...protrusion, 27...cut and raised piece,
29...Annular stepped portion.

Claims (1)

[Claims] 1. A bobbin 12 around which a voice coil 13 is wound.
a first step of inserting the frame 6 into the magnetic gap of the magnetic circuit 1 to which the frame 6 is assembled using the insertion jig 22; At the same time, the flange 1 provided on the bobbin 12 by this supporting jig 23 is attached.
a second step of supporting the bobbin 12 and restricting movement of the bobbin 12 in the radial direction; a third step of removing the insertion jig 22 from the bobbin 12; fixing the flat diaphragm 15 to the frame 6 and connecting the diaphragm 15 and the bobbin 12; a fourth step of attaching the diaphragm 15 to the bobbin 12 via members 19 and 20;
2, a fifth step of removing the support jig 23 from the frame 6 and releasing the support of the bobbin 12.