JPH11150793A - Voice coil and speaker using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a speaker high in resistance to input and high in its quality by bending the extension parts of bobbin main bodies and holding a coil with the bobbin main bodies thereby improving the shape stability of a voice coil by resonance at the time of the operation of the speaker. SOLUTION: Bobbin main bodies 11A and 11B are provided with extension parts 11C and 11D extended downward. These main bodies 11A and 11B are obtained by respectively heat-press-forming a hard aluminum bobbin sheet to stabilize its shape and making it in a half shin and long form. These bobbin sheet parts are combined by a reinforced paper to make the thin and long bobbin main bodies, and a coil consisting of a magnet wire is coiled to fold- bend-work the parts 11C and 11D of the bobbin main bodies to wrap the coil to closely adhere to the outer peripheral part of the coil to constitute as a track-type voice coil. Consequently, the bobbin main bodies are arranged not only at the inner peripheral part of the coil but at the outer peripheral part and a lowest part in addition and especially concerning the lowest part, a remarkable effect is shown for a vibration proof countermeasure by resonance in a horizontal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice coil of a loudspeaker used for various audio equipment and a loudspeaker using the same.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. FIG. 5 is a perspective view of a bobbin as a main part of the voice coil, FIG. 6 is a perspective view of the voice coil, and FIG. 7 is a sectional view of the same. FIG. 8 is a sectional view of a speaker using the voice coil of FIG.

First, the configuration of the speaker will be described with reference to FIG. 8. Reference numeral 2 denotes a magnetic circuit provided with a magnetic gap, and 3 denotes a frame coupled to the magnetic circuit 2.
Reference numeral 1 denotes a voice coil fitted in a magnetic gap of the magnetic circuit 2, and reference numeral 4 denotes a diaphragm having an edge portion whose inside is connected to the voice coil 1 and whose outer periphery is connected to the frame 3.

Next, the voice coil 1 will be described in more detail with reference to FIGS.
A and 1B are formed by molding a rectangular sheet of hard aluminum, paper, TIL, Kapton, or the like.
An elongated voice coil 1 is formed by forming an elongated shape facing each other, winding the coil 1C with a winding jig, and attaching a reinforcing paper 1D above the coil 1C.

[0005]

However, the conventional voice coil 1 of this type has a problem that it is difficult to design a high input resistance and the quality is not stable due to a gap defect in a production process. .

The reason for this is that the linear portion of the voice coil 1 generates resonance in the horizontal direction due to the acting force due to the amplitude in the vertical direction, that is, the vertical direction when an input is applied. In this case, it is difficult to arrange the coil 1C in the magnetic gap without eccentricity at the center thereof due to the generation of resonance, and it is difficult in terms of the production method, and it is difficult to design a high input resistance. .

That is, the coil 1 is located at the center of the magnetic gap.
If C is not disposed and even a part of the coil is eccentric, the voice coil 1 has a large amplitude when a large input is applied, vibrates in the horizontal direction due to the occurrence of resonance, and the coil 1C comes into contact with the magnetic gap to cause a gap defect. Met.

[0008]

In order to solve the above-mentioned problems, a voice coil according to the present invention comprises a bobbin main body, an extended portion formed by extending at least a part of a lower portion of the bobbin main body, and a bobbin main body. The bobbin main body is bent by bending the extension of the bobbin main body and holding the coil between the bobbin main body and the bobbin main body being deformed by the bent extension of the bobbin main body. Can be suppressed, the input resistance can be improved, and a gap failure can be prevented.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a bobbin main body, an extension formed by extending at least a part of a lower part of the bobbin main body, and a bobbin main body. By bending the extended portion of the bobbin body and holding the coil between the bobbin body, deformation of the bobbin body during driving is suppressed, input resistance is improved, and quality is stabilized. Can be achieved.

According to a second aspect of the present invention, a resin having a damping property is injected between the bobbin main body according to the first aspect and the bent extension portion. The shape stability as a voice coil is further improved,
The input resistance and quality can be further improved.

According to a third aspect of the present invention, there is provided a magnetic circuit provided with at least a magnetic gap, a frame coupled to the magnetic circuit, and a magnetic circuit fitted in the magnetic gap of the magnetic circuit. It is composed of a voice coil and a diaphragm coupled to the voice coil and the frame, and can provide a speaker with high input resistance.

An embodiment of a voice coil according to the present invention will be described below with reference to FIGS. In the description, the same parts as those of the related art are denoted by the same reference numerals, and description thereof will be omitted.

(Embodiment 1) FIG. 1 is an exploded perspective view of a bobbin main body which is a main part of a voice coil according to an embodiment, FIG. 2 is a perspective view thereof, and FIG. 3 is a sectional view thereof. . 1
Reference numerals 1A and 11B denote bobbin bodies, which have extensions 11C and 11D extending downward. This bobbin body 11
Reference numerals A and 11B depict hard aluminum bobbin sheets, respectively, by hot press forming to stabilize the forming and make them semi-slim. These bobbin sheet parts are joined by reinforcing paper 13 to form an elongated bobbin main body 11, and a coil 12 is wound around a magnet wire to form a bobbin main body 11.
The extension portions 11C and 11D of the
Is wrapped in close contact with the outer peripheral portion of the coil 12 to constitute a track-type voice coil 14.

By doing so, the bobbin main body 11 is arranged not only at the inner peripheral portion but also at the outer peripheral portion and further at the lowermost portion of the coil 12, and especially at the lowermost portion, there is a great effect for countermeasures against vibration due to horizontal resonance. Therefore, the shape stability can be improved, the input resistance of the speaker can be increased, and the defective rate at the time of production of the speaker can be reduced.

(Embodiment 2) FIG. 4 is a sectional view of a voice coil according to another embodiment of the present invention. The difference between the present embodiment and the first embodiment is that the bobbin main body 11 is bent to reach the top end, and the vibration damping effect is provided between the inner peripheral portion and the outer peripheral portion of the bobbin main body 11. In this case, a track-type voice coil 16 is formed by injecting an acrylic or epoxy resin 15 having a large diameter.

By doing so, the shape stability of the bobbin main body 11 due to resonance during the operation of the speaker is improved, the input resistance of the speaker can be increased, and the defective rate during production can be reduced. It is possible.

(Embodiment 3) Using the voice coils 14 and 16 having the structure shown in the above-described Embodiments 1 and 2, the frame 3 coupled to the magnetic circuit 2 as shown in FIG. The voice coil 14 or 16 is coupled to the center of the diaphragm 4 to which the voice coil 14 is attached, and the voice coil 14 or 16 is fitted into the magnetic gap of the magnetic circuit 2 without eccentricity to form a speaker.

According to this configuration, the input stability of the speaker can be improved due to the shape stability of the voice coil 14 or 16 without causing a gap defect.

[0019]

As described above, the voice coil of the present invention is
Since the extension of the bobbin body is bent to hold the coil between the bobbin body, the shape stability of the voice coil due to resonance during the operation of the speaker is improved, the input resistance of the speaker is improved, and the quality is improved. It is possible to achieve stabilization.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bobbin main body which is a main part of a voice coil according to an embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a sectional view of the same.

FIG. 4 is a cross-sectional view of another embodiment.

FIG. 5 is a perspective view of a bobbin which is a main part of a conventional voice coil.

FIG. 6 is a perspective view of the same.

FIG. 7 is a sectional view of the same.

FIG. 8 is a sectional view of a conventional elongated speaker.

[Explanation of symbols]

 1, 14, 16 Voice coil 2 Magnetic circuit 3 Frame 4 Diaphragm 11A, 11B Bobbin main body 11C, 11D Extension 12 Coil 15 Resin

Claims (3)

[Claims] 1. A bobbin main body, an extension formed by extending at least a part of a lower portion of the bobbin main body, and a coil wound around a lower portion of the bobbin main body. A voice coil that bends and holds the coil between the bobbin body. 2. The voice coil according to claim 1, wherein a damping resin is injected between the bent extension and the bobbin body. 3. A magnetic circuit having at least a magnetic gap, a frame coupled to the magnetic circuit, the voice coil according to claim 1 fitted in the magnetic gap of the magnetic circuit, and the voice coil. And a diaphragm coupled to the frame.