JP3128994B2 - Speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used for various audio equipment.

[0002]

2. Description of the Related Art A conventional general speaker is constructed as shown in FIG. That is, the center pole 1
A frame 6 is coupled to a magnetic circuit 5 composed of a lower plate 2 having a ring shape, a ring-shaped magnet 3 and a ring-shaped upper plate 4.
An edge 9 connected to the outer peripheral portion of the diaphragm 8 together with the gasket 7 is bonded to the peripheral portion of the diaphragm 8 by bonding or the like.
A voice coil 10 is adhesively bonded to a central portion of the voice coil 10, and an intermediate portion of the voice coil 10 is held by a damper 11 and a lower portion of the voice coil 10 is fixed to a magnetic gap
And a dust cap 13 is attached to the upper surface of the center of the diaphragm 8 without eccentricity.

In such a conventional speaker, a diaphragm 8, an edge 9, a voice coil 10, a damper 11,
Coupling of vibration system components such as dust cap 13 (diaphragm 8
And edge 9, voice coil 10 and diaphragm 8, diaphragm 8
Dust cap 13, voice coil 10 and damper 1
1, between the edge 9 and the frame 6) , a rubber-based adhesive was used. However, since this rubber-based adhesive contains a large amount of an organic solvent, a certain amount of the solvent volatilizes, and the It takes a long time to have the strength, and there is a drawback that the organic solvent is volatilized and environmental pollution and mass productivity are lacking.

Further, a rubber-based adhesive is deteriorated by heat generation of the voice coil 10 in a large input speaker due to lack of heat resistance, and is used for bonding the voice coil 10 and the diaphragm 8 due to low hardness. Since the vibration of the voice coil 10 is attenuated and transmitted to the diaphragm 8, there is a disadvantage that a sufficient sound pressure cannot be obtained.

[0005] For this reason, epoxy adhesives and acrylic adhesives are used as adhesives having excellent heat resistance and high hardness. However, since these adhesives are usually of two-component type, they are difficult to mix. There have been many problems, such as a problem that the amount of application increases and the weight of the vibration system increases to lower the sound pressure, and that a relatively long time is required for curing.

Accordingly, a moisture-curable urethane-based hot melt adhesive as described in Utility Model Registration No. 186788 has recently been used in place of these adhesives. This moisture-curable urethane hot melt adhesive is
It is composed of a resin obtained by reacting a polyisocyanate having two or more isocyanate groups with a compound having two or more active hydrogen groups, for example, a polyol. This resin has a property of being crosslinked by moisture in the air. It is melted by heating before crosslinking and used as a hot melt adhesive. After being fixed as a hot melt adhesive, a crosslinking reaction is caused by moisture in the air to reach a final strength.

Therefore, the moisture-curable urethane hot-melt adhesive does not contain an organic solvent and can be solidified (initial bonding) in a short time like a one-component reaction type hot-melt adhesive. It could be solved.

[0008]

However, the conventional moisture-curable urethane hot-melt adhesive has a very high final strength after a cross-linking reaction due to moisture in the air. Due to the low adhesive strength,
In the speaker operation test in the final step of the speaker assembly line where the adhesive crosslinking reaction has not progressed sufficiently over time, especially in a speaker with a large input resistance, it cannot withstand the amplitude stress and breaks the adhesive. There was a problem that.

The present invention solves the above-mentioned conventional problems, and uses an adhesive capable of exhibiting a large fixing force in a short time even with a small amount of application, so that a high-performance speaker excellent in mass productivity and excellent in durability is provided. The purpose is to provide.

[0010]

In order to solve the above-mentioned problems, a speaker according to the present invention is used at least for coupling of vibration system components (connection of a voice coil and a diaphragm, a diaphragm and an edge, an edge and a frame, etc. ). Moisture-curable urethane hot-melt adhesive is used to impart tackiness when solidified by mixing certain additives, and this additive is compatible with the moisture-curable urethane hot-melt adhesive. Touches with an average molecular weight of 1,000 or more and 10,000 or less
It uses a urethane-based polymer that is a kinesizing agent .

[0011]

According to this constitution, in addition to the adhesive strength of the conventional moisture-curable urethane hot-melt adhesive when the molten adhesive is solidified, the initial adhesive strength is greatly improved because the adhesive is tacky when solidified. Can be. Therefore, the initial adhesive force can sufficiently cope with a speaker operation test performed about 15 minutes after bonding during speaker manufacture.
It is not necessary to newly provide a time for the adhesive to react by absorbing moisture in the air, and it is possible to provide a high-performance speaker with good mass productivity and excellent durability.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A speaker according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a half sectional view showing the structure of a speaker according to the present invention. In the present embodiment, a conventional joint is provided at two places, that is, a joint between a diaphragm 8 and an edge 9 and a joint between an edge 9 and a frame 6. A moisture-curable urethane-based hot-melt adhesive is prepared by adding 20 urethane-based polymers which have an average molecular weight of 3,000 or more and 10,000 or less and which are compatible with the above-mentioned adhesive and are tackiness-imparting agents.
The speaker was assembled using an adhesive having an improved adhesion when solidified by adding wt%.

Further, as a comparative example, the adhesive force of a speaker which was assembled by bonding the same parts with a conventional moisture-curable urethane hot melt adhesive which did not add anything and did not improve the adhesiveness during solidification. Were compared.

The adherend was measured for 180-degree peel adhesive strength using a galvanized steel sheet as the material of the frame 6 and an SBR rubber latex coating cloth as the material of the edge 9, and the measurement was performed 15 minutes after bonding. Twice after 24 hours. The results are shown in (Table 1).

[0016]

[Table 1]

As is clear from the above measurement results, the comparative example having no tackiness when the hot melt was solidified had a low strength 15 minutes after the solidification, but the tackiness was increased during the solidification. In the case of the example, the strength is found to be sufficiently high even after 15 minutes, which is more than twice the required strength.

[0018] Therefore, it can be used satisfactorily even in the bonded portion of the present embodiment where the amplitude stress of the diaphragm 8 is applied at the time of the operation inspection of the speaker performed on the assembly line 15 minutes after the bonding. Thus, it is possible to provide a high-performance speaker that can be fixed in a short time, has good mass productivity, and has excellent durability.

[0019]

As described above, the speaker according to the present invention has the following features.
Vibration-type components are bonded with a moisture-curable urethane-based hot-melt adhesive that is sticky when solidified, so it can be fixed for a short time with a small application amount, without solvent, and has excellent mass productivity and excellent durability. This is a great industrial value that can provide a high-performance speaker.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a configuration of a speaker according to an embodiment of the present invention.

FIG. 2 is a half sectional view showing a configuration of a conventional speaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Center pole 2 Lower plate 3 Magnet 4 Upper plate 5 Magnetic circuit 6 Frame 7 Gasket 8 Diaphragm 9 Edge 10 Voice coil 11 Damper 12 Magnetic gap 13 Dust cap

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04R 7/20 C09J 5/06 H04R 9/02 101

Claims (1)

(57) [Claims] A frame is coupled to a magnetic circuit having a magnetic gap, and a voice coil that fits into the magnetic gap is coupled to a central portion of the frame at a peripheral portion of the frame, and a diaphragm having an edge coupled to an outer peripheral portion is coupled to the frame. consisting of Te speaker of
Moisture-curable urethane-based hot melt for connecting vibration system components
The speaker using an adhesive, formed by using a moisture-curable urethane hot-melt adhesive obtained by blending urethane polymer is a tackiness imparting agent compatible with each other in the low molecular weight-average molecular weight of 1000 to 10,000 in the adhesive Speaker.