JP3199336B2 - Support structure for speaker vibration system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a speaker vibration system in which the vibration system of a speaker unit has a damperless structure.

[0002]

2. Description of the Related Art Conventionally, for example, a speaker unit for a vehicle has been reduced in thickness due to limited installation locations and the like.

[0003] As a device for achieving such a reduction in thickness, for example, Japanese Patent Publication No. 55-42559 discloses a speaker unit having a vibration system with a damperless structure. That is, as shown in FIG. 1, a coil bobbin 4 around which a voice coil 3 is wound is disposed in a magnetic gap formed by a ring-shaped magnet 1 and a center pole 2. A diaphragm 5 is provided on the outer peripheral end of the coil bobbin 4.
Are connected to each other. On the inner peripheral surface of the end portion of the coil bobbin 4, a bearing 6 that contacts the outer peripheral surface of the center pole 2 is provided.

In such a configuration, when a voice current is supplied to the voice coil 3, the coil bobbin 4 moves up and down due to the action of the magnetic flux flowing in the magnetic gap formed by the magnet 1 and the center pole 2, thereby causing vibration. The plate 5 is vibrated. At this time, the bearing 6 provided on the inner peripheral surface of the end portion of the coil bobbin 4 comes into contact with the outer peripheral surface of the center pole 2 so that the coil bobbin 4 is
Therefore, the vertical movement of the coil bobbin 4 is performed in a stable state. For this reason, a damper for elastically supporting the coil bobbin 4 is not required, so that the speaker can be made thinner.

[0005]

As described above, in the above-mentioned conventional speaker unit, in order to stabilize the vertical movement of the coil bobbin 4, the bearing 6 provided on the inner peripheral surface at the end of the coil bobbin 4 is provided. Is configured to be in contact with the outer peripheral surface.

For this reason, since the bearing 6 comes into surface contact with the outer peripheral surface of the center pole 2, the contact area of the bearing 6 becomes large. Therefore, when the coil bobbin 4 moves up and down, a rubbing noise due to the contact of the bearing 6 is generated. This causes a problem that the sound quality is deteriorated.

[0007] The present invention has been made in view of such circumstances, and has as its object to provide a support structure for a speaker vibration system that can prevent deterioration of sound quality.

[0008]

According to a first aspect of the present invention, in a support structure for a speaker vibration system, an outer peripheral end of a resin film body fitted to a center pole of a yoke is folded outward. The folded portion is in contact with the inner surface of the coil bobbin.

[0009]

[0010]

According to the first aspect of the present invention, since the folded portion formed by folding the outer peripheral end outward on the outer peripheral surface of the resin film body contacts the inner surface of the coil bobbin, the vertical movement is stabilized. It is performed in a state, and the manufacturing method is easier as compared with a conventional voice coil.

[0011]

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 2 and 3 show a speaker unit according to an embodiment of the support structure of the speaker vibration system of the present invention. As shown in these figures, the center pole 1
The inner peripheral surface of the frame 12 is fixed to the outer peripheral edge of the yoke 11 having a zero. A polygonal resin film cap 20 having excellent heat resistance is fitted to the upper end of the center pole 10. A plurality of convex portions 21 are provided on the outer peripheral portion of the resin film cap 20. These projections 21 are in line contact with the inner peripheral surface of the coil bobbin 16 described later.

Further, the convex portion 2 of the resin film cap 20 is provided.
1 is disposed in a magnetic gap between the center pole 10 and a plate 14 described later. Thus, when the coil bobbin 16 moves up and down, the protrusion 21 abuts on the voice coil 15 via the coil bobbin 16, so that the coil bobbin 16 moves up and down in a stable state.

The resin film cap 20 may be made of, for example, polyimide (PI), polyetherimide (PEI), aramid, polyetheretherketone (PEEK), polycarbonate (PC), polyphenylene sulfide (PPS), A heat-resistant resin such as polyethersulfone (PES), polysulfone (PSF), and polyester (PET) is used.

A ring-shaped magnet 13 is fixed to the upper surface of the yoke 11. A ring-shaped plate 14 is fixed to the upper surface of the magnet 13. A coil bobbin 16 around which a voice coil 15 is wound is disposed in a magnetic gap between the plate 14 and the center pole 10. A cap 17 is fitted into the upper end opening of the coil bobbin 16. An inner peripheral end of a diaphragm 18 made of cone paper is fixed to an outer peripheral part of an upper end of the coil bobbin 16. The outer peripheral end of the diaphragm 18 is fixed to a support piece 19 a of the edge 19. Outer edge 1 of edge 19
9b is fixed to the outer peripheral portion 12a of the frame 12.

Next, a method of manufacturing the speaker unit having such a configuration will be described. First, as shown in FIG. 4, a magnetic circuit is assembled. That is, the inner peripheral surface of the frame 12 is fixed to the outer peripheral edge of the yoke 11 having the center pole 10, the ring-shaped magnet 13 is fixed to the upper surface of the yoke 11, and the ring-shaped plate 14 is fixed to the upper surface of the magnet 13. Stick.

After the assembly of the magnetic circuit is completed, an adhesive is applied to the upper end surface of the center pole 10 and a resin film cap 20 is fitted as shown in FIGS. After the fixing of the resin film cap 20 is completed, the coil bobbin 16 around which the voice coil 15 is wound is fitted to the center pole 10 of the yoke 11 via the voice gauge 30. After the fitting of the coil bobbin 16 is completed, the diaphragm 18 is attached as shown in FIG. That is, the outer peripheral end portion 19b of the integrally formed edge 19 is fixed to the outer peripheral portion 12a of the frame 12 via an adhesive. After the fixing of the edge 19, as shown in FIG. 8, an adhesive is applied to the outer peripheral portion of the upper end of the coil bobbin 16, and the inner peripheral end portion of the diaphragm 18 is fixed to this portion.

After the diaphragm 18 has been mounted, the lead wire of the voice coil 15 is soldered to the end of the tinsel wire exposed on the upper surface side of the diaphragm 18 as shown in FIG. As shown in FIG. 10, the lead wire is reinforced by applying an adhesive to a portion of the diaphragm 18 where the lead wire is attached. After reinforcing the lead wires, as shown in FIG.
The cap 17 is fixed to the upper end opening of the coil bobbin 16 with an adhesive.

The speaker unit having such a structure performs the following operation. First, when a voice current is supplied to the voice coil 15, the coil bobbin 16 moves up and down by the action of the magnetic flux flowing between the magnetic gaps, causing the diaphragm 18 to vibrate. At this time, the plurality of protrusions 21 of the resin film cap 20 fitted on the upper end surface of the center pole 10 come into line contact with the inner peripheral surface of the coil bobbin 16, and stabilize the vertical movement of the coil bobbin 16.

As described above, in this embodiment, the resin bobbin cap 20 having the plurality of projections 21 is fitted on the upper end surface of the center pole 10 and is brought into line contact with the inner peripheral surface of the coil bobbin 16 to thereby provide the coil bobbin. The up-and-down movement of 16 was stabilized. Therefore, since the plurality of protrusions 21 of the resin film cap 20 are in line contact with the inner peripheral surface of the coil bobbin 16, the contact area of the protrusions 21 is very small, and the rubbing when the coil bobbin 16 moves up and down is reduced. Since the sound is reduced, the problem that the sound quality is deteriorated is eliminated.

FIG. 12 shows the above resin film cap 2
13 shows another embodiment in which the configuration of 0 is changed.
That is, the outer peripheral portion 23 of the resin film cap 22 shown in FIG. A slight gap is formed between the outer peripheral edge 23 turned outward and the side 22 a of the resin film cap 22.

Next, a method of manufacturing the speaker unit having such a configuration will be described. First, as shown in FIG. 13, a magnetic circuit is assembled. That is, the inner peripheral surface of the frame 12 is fixed to the outer peripheral edge of the yoke 11 having the center pole 10, the ring-shaped magnet 13 is fixed to the upper surface of the yoke 11, and the ring-shaped plate 14 is fixed to the upper surface of the magnet 13. Stick.

After the completion of the assembly of the magnetic circuit, the voice coil 1 is connected via the voice gauge 30 as shown in FIG.
5 is fitted to the center pole 10 of the yoke 11. After the fitting of the coil bobbin 16 is completed, the diaphragm 18 is attached as shown in FIG. That is, the outer peripheral end portion 19b of the integrally formed edge 19 is fixed to the outer peripheral portion 12a of the frame 12 via an adhesive. After the fixing of the edge 19, as shown in FIG. 16, an adhesive is applied to the outer periphery of the upper end of the coil bobbin 16, and the inner peripheral end of the diaphragm 18 is fixed to this portion.

After the diaphragm 18 has been mounted, the lead wire of the voice coil 15 is connected to the diaphragm 18 as shown in FIG.
The solder wire is soldered to the end of the tinsel wire exposed on the upper surface side, and as shown in FIG. 18, the lead wire is reinforced by applying an adhesive to the portion of the diaphragm 18 where the lead wire is attached. After reinforcing the lead wires, as shown in FIG.
The voice gauge 30 is removed, an adhesive is applied to the upper end surface of the center pole 10, and the resin film cap 22 is fitted. After the fixing of the resin film cap 22 is completed, the cap 17 is fixed to the upper end opening of the coil bobbin 16 with an adhesive as shown in FIG.

The resin film cap 2 having such a configuration
In 2, the outer peripheral portion 23 comes into contact with the inner peripheral surface of the coil bobbin 16 to stabilize the vertical movement of the coil bobbin 16.
When the outer peripheral portion 23 comes into contact with the inner peripheral surface of the coil bobbin 16, a slight gap is formed between the outer peripheral portion 23 folded outward and the side portion 22a of the resin film cap 22. Because the outer peripheral portion 23 can bend toward the side 22a of the resin film cap 22,
Useless vibration in the horizontal direction of the coil bobbin 16 can be absorbed.

[0026]

As described above, according to the support structure of the speaker vibration system of the present invention, since the plurality of projections formed on the outer peripheral surface of the resin film body are in contact with the inner surface of the coil bobbin, the coil bobbin is positioned at the center. The contact area of the convex portion when moving in the axial direction of the pole is small, so that the rubbing noise when the coil bobbin moves is reduced, and the outer peripheral end of the resin film body is directed outward. Since the folded portion formed by being folded in contact with the inner surface of the coil bobbin, the vertical movement is performed in a stable state, so that it is possible to prevent the sound quality from deteriorating.
In addition, the manufacturing method can be facilitated as compared with a conventional voice coil.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a conventional speaker unit having a damperless structure.

FIG. 2 is a diagram showing a speaker unit according to an embodiment of the support structure of the speaker vibration system of the present invention.

FIG. 3 is a view showing the resin film cap of FIG. 2;

FIG. 4 is a diagram illustrating a method of manufacturing the speaker unit of FIG. 2;

FIG. 5 is a view illustrating a method of manufacturing the speaker unit of FIG. 2;

FIG. 6 is a diagram illustrating a method of manufacturing the speaker unit in FIG. 2;

FIG. 7 is a diagram illustrating a method of manufacturing the speaker unit in FIG. 2;

FIG. 8 is a diagram illustrating a method of manufacturing the speaker unit in FIG. 2;

FIG. 9 is a diagram illustrating a method of manufacturing the speaker unit in FIG. 2;

FIG. 10 is a diagram illustrating a method of manufacturing the speaker unit in FIG. 2;

FIG. 11 is a diagram illustrating a method of manufacturing the speaker unit in FIG. 2;

FIG. 12 is a view showing another embodiment in which the configuration of the resin film cap of FIG. 2 is changed.

13 is a diagram illustrating a method of manufacturing the speaker unit in FIG.

14 is a diagram illustrating a method of manufacturing the speaker unit in FIG.

15 is a diagram illustrating a method of manufacturing the speaker unit in FIG.

FIG. 16 is a diagram illustrating a method of manufacturing the speaker unit in FIG.

17 is a diagram illustrating a method of manufacturing the speaker unit in FIG.

FIG. 18 is a diagram illustrating the method of manufacturing the speaker unit in FIG.

19 is a diagram illustrating a method of manufacturing the speaker unit in FIG.

20 is a diagram illustrating a method of manufacturing the speaker unit in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Center pole 11 Yoke 12 Frame 13 Magnet 14 Plate 15 Voice coil 16 Coil bobbin 18 Vibration plate 19 Edge 20, 22 Resin film cap 21 Convex part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04R 9/02 102

Claims (1)

(57) [Claims] 1. An outer peripheral end of a resin film body fitted to a center pole of a yoke is outwardly folded,
A support structure for a speaker vibration system, wherein the folded portion is in contact with the inner surface of the coil bobbin.