JPH10174193A - Voice coil bobbin and speaker using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker suitably withstanding a high level input with respect to a voice coil bobbin used for various acoustic devices and the speaker using it. SOLUTION: The voice coil bobbin 11 is formed by connecting bobbin sheets 11a, 11b, 11c formed in a circular-arc shape in advance with a reinforcement paper sheet 12 on which an adhesiver is coated. Since the voice coil bobbin 11 is made up of the split bobbin sheets 11a, 11b, 11c, a restoration force (a force to be restored to an original sheet shape) is suppressed so as to prevent deformation in the voice coil bobbin and production of a noise sound due to a defective gap of the speaker is prevented and a high input resistance to the speaker is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIGS.
This will be described below. 6 is a side sectional view of a conventional speaker, FIG. 7 is a perspective view of a voice coil bobbin used in the speaker, FIG. 8 is a top view of the same, and FIG. 9 is a perspective view of another voice coil bobbin. FIG. 10 is a perspective view of a voice coil bobbin of a track-shaped elongated speaker which is another conventional speaker.

According to FIG. 1, reference numeral 1 denotes a magnetic circuit composed of upper and lower plates and a magnet, 2 denotes a frame mounted on the magnetic circuit 1, and 3 denotes an outer periphery of the frame 2.
And a diaphragm whose inner periphery is connected to the voice coil bobbin 4. 5 has an outer periphery connected to the frame 2,
The inner periphery is connected to the voice coil bobbin 4 to form the magnetic circuit 1
Is a damper which is supported so that a part of the voice coil bobbin 4 is fitted into the magnetic gap 1a.

A portion of the voice coil bobbin 4 fitted in the magnetic gap 1a has a voice coil 4
a is wound to form a speaker.

Next, the voice coil will be described with reference to FIGS. 7 and 8. When the voice coil bobbin 4 is made of hard aluminum,
Bobbin sheet 4c made of a rectangular shape such as paper or Kapton
Is formed by curling, and the voice coil 4 is wound with a winding jig.
a, and reinforcing paper 4b is placed on top of the voice coil bobbin 4.
To form a so-called voice coil (a voice coil bobbin 4 wound with a voice coil 4a) as a speaker component.

As shown in FIG. 9, a paper is spirally bonded to form a circular paper tube, and the paper tube is cut to obtain a voice coil bobbin 4g. A coil that winds a coil 4a to form a so-called voice coil has been used.

Further, as shown in FIG. 10, in the case of a voice coil bobbin 4e used for an elongated speaker, a voice coil bobbin 4e is obtained by curling a rectangular bobbin sheet, and the voice jig is wound by a winding jig. Coil 4a
And reinforcing paper 4f is stuck on the upper part of the voice coil 4a to form a track-type voice coil bobbin 4e.

[0008]

However, the conventional voice coil bobbins 4, 4g, and 4e of this type have 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. Had.

The reason for this is that after the voice coil bobbins 4 and 4e composed of bobbin sheets are completed, a restoring force is exerted by the springback that the bobbin sheets always try to return to the original sheet shape. , 4f
Therefore, the roundness of the voice coil bobbins 4 and 4e cannot be ensured even if they are fixed, and the shape stability performance is poor because the voice coil bobbins 4 and 4e have a curved shape. It is difficult to arrange them at the center, and it is difficult to design a high input resistance. That is, if the voice coil 4a is not disposed at the center of the magnetic gap 1a and a part of one circle is slightly eccentric, the voice coil bobbin 4 has a large amplitude when a large input is applied. There is a problem that the voice coil bobbin 4 comes into contact with the magnetic gap 1a due to the distortion and a gap defect is likely to occur. In addition, this phenomenon has a problem that not only the problem of high input resistance but also a gap defect in the production process of general loudspeakers tends to occur.

Next, in the case of the voice coil bobbin 4g shown in FIG. 9, since a large force is applied to the joint of the voice coil bobbin 4g when a large input is applied to the joint of the voice coil bobbin, a gap failure due to buckling is likely to occur. Had a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a voice coil bobbin which solves such a conventional problem, has a high input resistance and is very stable in quality.

[0012]

In order to solve the above-mentioned problems, a voice coil bobbin according to the present invention comprises a plurality of bobbin sheets curled and butted, and at least the butted portions are joined together by reinforcing paper. Yes, the restoring force due to the springback generated by the curling process is dispersed by making multiple bobbin sheets to prevent deformation of the voice coil bobbin, preventing abnormal noise due to gap failure and improving input resistance. It is possible.

[0013]

According to a first aspect of the present invention, a plurality of bobbin sheets are curled and butted, and at least the butted portions are joined with reinforcing paper. By dispersing the restoring force due to the spring back generated by the multiple bobbin sheets, deformation of the voice coil bobbin is prevented, abnormal noise due to speaker gap failure is prevented, and high input resistance is possible. Is what you do.

According to a second aspect of the present invention, the voice coil according to the first aspect has a configuration in which a plurality of bobbin sheets whose shapes are stabilized in advance are used. By using a plurality of bobbin sheets whose shapes are stabilized, the restoring force of the voice coil bobbin is further suppressed to prevent deformation, thereby contributing to higher input resistance of the speaker.

According to a third aspect of the present invention, an elongated track is formed by abutting a pair of bobbin sheets comprising a linear portion of the bobbin coil bobbin according to the first or second aspect and arc portions formed at both ends thereof. A voice coil bobbin of a shape is formed, which suppresses swelling during the formation of the linear portion to prevent deformation and waving when the voice coil is wound, and prevents abnormal sound due to a gap defect from occurring. This enables input resistance.

According to a fourth aspect of the present invention, there is provided a magnetic circuit having a magnetic gap, a frame mounted on the magnetic circuit, an outer periphery connected to the frame, and an inner periphery fitted to the magnetic gap. And a diaphragm coupled to the voice coil bobbin according to claim 1, further comprising a voice coil wound thereon, and capable of realizing high input resistance as a speaker. It is.

An embodiment of the voice coil bobbin according to the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a perspective view of an embodiment of a voice coil bobbin of the present invention, and FIG. 2 is a top view of the same.

According to FIG. 1, reference numerals 11a, 11b, and 11c denote bobbin sheets made of hard aluminum which are hot-pressed into an arc shape, are provided with slits, and are joined together by a reinforcing paper 12 coated with an adhesive. The voice coil bobbin 11 is formed. The voice coil 13 is wound around the voice coil bobbin 11, and is incorporated in a speaker (not shown).

In the above-mentioned voice coil bobbin 11, bobbin sheets 11a, 11b, 11 made of hard aluminum are used.
c was divided into three parts to suppress springback during processing into an arc shape, and further, the processing into this arc shape was stabilized by hot press forming in advance.
In addition to improving the roundness and shape stability of 1 and improving the input resistance of the speaker, it is also possible to reduce the gap failure at the time of assembling the speaker.

The number of bobbin sheets to be divided is appropriately selected according to the shape and material of the voice coil bobbin depending on the type of speaker, and depending on the shape, a plurality of bobbin sheets are abutted without the need for prior heat press molding. Suppress springback just by joining together,
The object of the present invention can be achieved, and it is needless to say that such an object is also included in the technical scope of the present invention.

Although the first embodiment does not particularly refer to a speaker, the input coil can withstand input by using the voice coil bobbin 11 of the present invention instead of the voice coil bobbin 4 of a general speaker described in the related art. It is possible to provide an improved speaker.

(Embodiment 2) FIG. 3 is a perspective view of a bobbin sheet which is a main part of a voice coil bobbin of an elongated (track) speaker according to another embodiment of the present invention, and FIG. FIG. 5 is a perspective view of a voice coil bobbin, and FIG.
FIG.

According to the drawing, 14a and 14b are linear portions a.
Is a bobbin sheet made of hard aluminum which is hot-pressed into a shape having arcuate portions b at both ends of the bobbin sheet.
Voice coil bobbin 1 with track shape
4 is formed. This voice coil bobbin 14
The voice coil 16 is wound around the loudspeaker and incorporated into a track-shaped elongated speaker (not shown).

Since the voice coil bobbin 14 is formed as described above, the swelling and deformation generated in the linear portion a due to the residual stress generated when the voice coil bobbin 14 is connected can be suppressed. It is possible to prevent deformation such as a waving phenomenon occurring in a.

As in the first embodiment, the number of divided bobbin sheets is appropriately selected according to the shape, material, etc. of the voice coil bobbin depending on the type of the speaker. It is also possible to achieve the object of the present invention by suppressing springback only by abutting and joining a plurality of bobbin sheets, and such a thing is also included in the technical scope of the present invention. Nor.

Although the second embodiment does not particularly refer to a speaker, the voice coil bobbin 14 of the present invention is used in place of the voice coil bobbin of a known slender (track type) speaker. It is possible to provide an elongated (track-type) speaker with improved characteristics.

[0028]

The voice coil bobbin according to the present invention comprises a plurality of bobbin sheets which are curled and butted, and at least the butted portions are joined together by reinforcing paper. The voice coil bobbin is restored by springback generated by curling. By dispersing the force by using a plurality of bobbin sheets, deformation of the voice coil bobbin is prevented, occurrence of abnormal sound due to gap failure is prevented, and high input resistance is enabled.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a voice coil bobbin of the present invention.

FIG. 2 is a top view of the same.

FIG. 3 is a perspective view of a bobbin sheet as a main part of a voice coil bobbin according to another embodiment of the present invention.

FIG. 4 is a perspective view of the same.

FIG. 5 is a top view of the same.

FIG. 6 is a side sectional view of a conventional speaker.

FIG. 7 is a perspective view of a conventional voice coil bobbin.

FIG. 8 is a top view of the same.

FIG. 9 is a perspective view of another voice coil bobbin.

FIG. 10 is a perspective view of another voice coil bobbin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Voice coil bobbin 11a, 11b, 11c Bobbin sheet 12 Reinforcement paper 13 Voice coil 14 Voice coil bobbin 14a, 14b Bobbin sheet 15 Reinforcement paper 16 Voice coil a Linear part b Arc part

Claims (4)

[Claims] 1. A voice coil bobbin in which a plurality of bobbin sheets are curled and butted, and at least the butted portions are joined by reinforcing paper. 2. The voice coil bobbin according to claim 1, wherein a plurality of bobbin sheets are processed in advance and stabilized in shape. 3. The voice coil bobbin according to claim 1, wherein a pair of bobbin sheets comprising a linear portion and arc portions formed at both ends of the linear portion are abutted to form an elongated track shape. 4. A magnetic circuit having a magnetic gap, a frame mounted on the magnetic circuit, an outer periphery coupled to the frame, and an inner periphery fitted to the magnetic gap,
3. The voice coil according to claim 1, further comprising a voice coil.
A speaker comprising a diaphragm coupled to the voice coil bobbin according to claim 3.