JPH08140189A - Speaker unit - Google Patents

Abstract

PURPOSE: To easily assemble a small-sized speaker unit. CONSTITUTION: A yoke 1, a magnet 2, and a plate 3 which constitute a magnetic circuit and a frame 4 are piled up, and an epoxy or acrylic adhesive 10 is charged into a U-shaped gap formed by the yoke 1, the magnet 2, the plate 3, the lower end part of the frame 4, and a flange 13. Peripheral side faces of the yoke 1, the magnet 2, and the plate 3 are stuck to the inside face of the flange 13 in the lower end part of the frame, thereby sticking respective members to one another. Thus, not only it is sufficient if the adhesive 10 is applied once but also the extent of application of the adhesive 10 is easily managed, and the small-sized speaker unit is easily assembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker unit which facilitates the assembly of a small speaker unit.

[0002]

2. Description of the Related Art A speaker unit is one electro-acoustic converter that converts an electric signal from an amplifier into an acoustic signal, and one structural example of its main part is as shown in FIGS.

That is, a ring-shaped magnet 2 is arranged on the yoke 1, and a ring-shaped plate 3 is also arranged on the magnet 2 to form a magnetic circuit. Abutting step portions 7 and 8 formed at the lower end portion 5 of the frame 4 are in contact with the upper portions of the magnet 2 and the plate 3, and the peripheral side surface of the magnet 2 is provided at the lower end portion 5 of the frame 4. The ring-shaped flange 6 is in contact.
A voice coil 9 is arranged in a magnetic gap formed between the yoke 1 and the plate 3.

When assembling the main part of such a speaker unit, for example, as shown in FIG. 5, after applying an appropriate amount of an adhesive on the yoke 1 to fix the magnet 2, the magnet 2 is fixed.
Similarly, an appropriate amount of adhesive is applied to the magnet 2 to fix the plate 3, and further an appropriate amount of adhesive is applied to the magnet 2 and the plate 3 and the peripheral side surface of the magnet 2 so that the lower end 5 of the frame 4 abuts. The steps 7 and 8 and the flange 6 are fixed.

[0005]

By the way, in the method of assembling the main part of the speaker unit described above, it is necessary to apply an adhesive each time the individual members are assembled, which not only increases the number of assembling steps but also requires a great deal of work. In the case of a small-sized micro speaker unit, the size of each member is extremely small, so that it is difficult to control the application amount of the adhesive, which is a problem, which requires skill.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a speaker unit capable of easily assembling a small speaker unit.

[0007]

In order to achieve the above object, the present invention provides a speaker unit in which a frame having a flange is arranged on a magnetic circuit composed of a yoke, a magnet and a plate, wherein the magnetic circuit is provided. The flange of the frame is arranged around the periphery excluding the bottom surface of the, and the yoke, the magnet, the plate and the frame are fixed to each other by injecting an adhesive into the gap between the magnetic circuit and the flange. It is characterized by

[0008]

In the speaker unit of the present invention, by stacking the yoke, the magnet and the plate forming the magnetic circuit, and the frame, the adhesive is injected into the gap formed between the magnetic circuit and the flange of the frame. yoke,
Since the magnet, the plate and the frame are fixed to each other, the adhesive can be applied only once, and the amount of adhesive applied can be easily controlled.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings described below, the same parts as those in FIGS.

FIGS. 1 and 2 show the essential parts of an embodiment of the speaker unit of the present invention.

As shown in these figures, the member structure of the main part of the speaker unit is substantially the same as the conventional one,
The shape of the lower end portion 5 of the frame 4 is different from the conventional one.

That is, the lower surface 1 of the lower end portion 5 of the frame 4
2 has a flat shape, and a flange 13 from the lower end 5
Is drooping. The height dimension of the flange 13 is substantially the same as the height dimension when the yoke 1, the magnet 2 and the plate 3 forming the magnetic circuit are stacked.

Further, a U-shaped gap is formed between the yoke 1, the magnet 2 and the plate 3 constituting the magnetic circuit and the lower end portion 5 of the frame 4 and the flange 13, and an epoxy or acrylic type gap is formed in the gap. When the adhesive 10 is filled, the yoke 1, the magnet 2, the plate 3, the lower end portion 5 of the frame 4 and the flange 13 are fixed to each other by the adhesive 10.

The main part of the speaker unit having such a structure is assembled as follows. That is, first, the magnet 2 is placed on the yoke 1 and the magnet 2
The plate 3 is placed on the plate 3, and the lower end portion 5 of the frame 4 is placed on the plate 3. In this state, a U-shaped gap is formed between the yoke 1, the magnet 2 and the plate 3 which form the magnetic circuit and the lower end portion 5 of the frame 4 and the flange 13. This gap is about 0.2 to 1.2 mm, which is sufficient to inject the epoxy-based or acrylic-based adhesive 10. Then, the adhesive 10 is injected into the gap from the lower side of the magnetic circuit to fill the U-shaped gap with the adhesive 10.

Thereafter, as the adhesive 10 is solidified, the peripheral side surfaces of the yoke 1, the magnet 2 and the plate 3 forming the magnetic circuit are fixed to the inner surface of the flange 13 of the lower end portion 5 of the frame 4, so that each member is separated. It will be fixed to each other.

As described above, in this embodiment, after the yoke 1, the magnet 2 and the plate 3 and the frame 4 which constitute the magnetic circuit are stacked, the yoke 1, the magnet 2 and the plate 3 and the lower end portion 5 of the frame 4 and The epoxy-based or acrylic-based adhesive 10 is injected into the U-shaped gap formed between the flange 13, and the peripheral side surfaces of the yoke 1, the magnet 2, and the plate 3 are connected to the flange 13 of the lower end 5 of the frame 4. Since the members are fixed to each other by fixing them to the inner surface, not only can the adhesive 10 be applied only once, but the amount of the adhesive 10 applied can be easily controlled and a small speaker unit can be applied. Will be easy to assemble.

In this embodiment, the case where the adhesive 10 is injected into the U-shaped gap formed between the magnetic circuit and the lower end 5 of the frame 4 and the flange 13 has been described. Not limited to this, an adhesive may be applied to the joint surface between the lower end 5 of the frame 4 and the plate 3. In this case, the lower end 5 of the frame 4 and the plate 3 may be applied.
Since the joint portion between and is also fixed, the reinforcing effect of the outer peripheral portion of the magnetic circuit can be enhanced.

[0018]

As described above, according to the speaker unit of the present invention, the yoke, the magnet, and the plate that form the magnetic circuit are stacked and then formed between the magnetic circuit and the flange of the frame. Since the yoke, magnet, plate, and frame are fixed to each other by injecting the adhesive into the gap, not only can the adhesive be applied once, but the amount of adhesive applied can be easily controlled. Therefore, it is possible to easily assemble a small speaker unit.

[Brief description of drawings]

FIG. 1 is a half-cut sectional view showing a main part according to an embodiment of a speaker unit of the present invention.

FIG. 2 is a bottom view showing the speaker unit of FIG.

FIG. 3 is a half-cut sectional view showing a main part of a conventional speaker unit.

FIG. 4 is a bottom view showing the speaker unit of FIG.

5 is a diagram showing a method of assembling the speaker unit of FIG.

[Explanation of symbols]

 1 yoke 2 magnet 3 plate 4 frame 5 lower end 9 voice coil 10 adhesive 13 flange

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunio Sanbebe 1105 Nikko, Kunohonji, Tendo City, Yamagata Prefecture Tohoku Pioneer Corporation

Claims (1)

[Claims] 1. A speaker unit in which a frame having a flange is provided on a magnetic circuit composed of a yoke, a magnet and a plate, wherein the flange of the frame is provided around the bottom of the magnetic circuit. A speaker unit, wherein the yoke, the magnet, the plate, and the frame are fixed to each other by injecting an adhesive agent into a gap between the magnetic circuit and the flange.