JPH0693799B2 - Vibrating component and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating component used in electroacoustic transducers such as speaker diaphragms and dust caps made of synthetic resin, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Vibratory parts such as speaker diaphragms and dust caps are, as is well known, fixed to or located in the vicinity of a voice coil, and are driven by the voice coil to emit sound waves. Since it is not a rigid body, it is difficult to perform piston motion except in the extremely low frequency band, and normally it becomes a high-order divided vibration mode and the frequency characteristics deteriorate, so the piston motion band is expanded to the high frequency band as much as possible and it occurs. In order to suppress the divided vibration, it is required that the rigidity is large and the vibration energy absorption capacity is large.
In addition, the heat resistance of the voice coil must be high because it is affected by the heat generated by the voice coil.

In recent years, materials satisfying these conditions have been used.
Those using engineering plastics such as polyetherimide (PEI) and polyethersulfone (PES) are often used.

[0004]

It is known that such a conventional vibrating component using a resin has a high elastic modulus (Young's modulus E), but it is not yet sufficient and the heat deformation temperature is high. Therefore, it is necessary to mold at an extremely high temperature.

Therefore, an object of the present invention is to solve the above-mentioned drawbacks of the conventional example and to provide a vibrating component excellent in elastic modulus, moldability, heat resistance and the like.

[0006]

A vibrating component and a method of manufacturing the same according to the present invention for achieving the above object are characterized in that a polyether nitrile resin is used in the vibrating component. It is characterized in that the ether nitrile resin is a crystallized polyether nitrile resin, and in the manufacturing method, after the vibrating part material using the polyether nitrile resin is molded into the shape of the vibrating part, the temperature is 200 ° C.
It is characterized in that it is crystallized in the temperature range of ˜260 ° C.

[0007]

By using the polyether nitrile resin for the vibrating component, the elastic modulus (Young's modulus E), heat resistance, solvent resistance, etc. are improved. Further, the crystallization of the polyether nitrile resin improves the elastic modulus and heat resistance, and as shown in FIG. 1, the crystallization rate is highest in the temperature range of 200 ° C to 260 ° C. It can be efficiently crystallized by holding at. Further, the polyether nitrile resin has the Young's modulus characteristics as shown in FIG. 2, and in the uncrystallized state, the Young's modulus sharply decreases in the temperature range above the heat deformation temperature.

Polyether nitrile resin is a crystalline wholly aromatic polyether having the structure of Chemical formula 1, and since it has a phenylene group in the main chain, it has excellent mechanical strength and heat resistance, and also has a moldability by an ether bond. It is a resin that has good properties and good adhesiveness due to nitrile groups.

[0009]

[Figure 1]

[0010]

[Fig. 2]

[0011]

[Chemical 1]

[0012]

EXAMPLE Example 1 will be described in detail as an example in which a dome-shaped speaker diaphragm is manufactured as a vibrating component according to the present invention. Polyether nitrile resin film (size 100 mm x 10
0 mm, thickness 40 μm) is placed on the concave mold of the dome-shaped (φ25) heating mold heated to 270 ° C. to 300 ° C.,
When the softening of the polyether nitrile resin film starts after 5 to 6 seconds, the molded diaphragm is taken out by pressing at a pressing pressure of 15 kg / cm ² for ² to 3 seconds. This diaphragm is 24
Using a mold having the same shape as the above-mentioned heat-molding mold heated to 0 ± 20 ° C., pressing was performed at a pressing pressure of 1 kg / cm ² for about 90 seconds to crystallize the polyether nitrile, and then the vibration plate was taken out, Cooling.

In Example 2, an example in which a dust cap is manufactured as a vibrating component according to the present application will be described in detail. The same polyether nitrile film as in Example 1 was placed on the concave mold of a dome-shaped (φ60) molding die heated to 270 to 300 ° C., left for 5 to 6 seconds to preheat until softened, and then 1
Press-mold at a pressure of 5 kg / cm ² for 2-3 seconds and take out the dome-shaped dust cap. Next, it is sandwiched between molds having the same shape as the above-mentioned mold heated to 240 ± 20 ° C., and heated and pressed at a pressure of 1 kg / cm ² for about 90 seconds for crystallization, and the dust cap is taken out and cooled.

The vibrating component and the method for manufacturing the same according to the present invention have been described above in detail with reference to typical examples.
The embodiment of the present invention is not limited to the above-mentioned embodiments, and for example, polyether nitrile and other materials are mixed or combined, or additives such as a rigidity-imparting material are added. The present invention can be appropriately modified and implemented as long as it has the constituent requirements described in the above range, exhibits the action of the present invention, and has the effects described below.

[0015]

[Effect] For comparison with the physical properties of the diaphragm obtained in Example 1, PEI (polyether imide), PES (polyether sulfone), PEEK (polyether ether ketone)
Table 1 shows the physical properties of each diaphragm.

[0016]

[Table 1] As is clear from Table 1, the vibrating component according to the present application has sufficient heat resistance as an electroacoustic transducer, excellent elastic modulus, and solvent resistance, and those using crystallized polyether nitrile are Further, since the Young's modulus E, the specific elastic modulus E / ρ, and the heat deformation temperature are all improved, the acoustic characteristics are extremely excellent, and the characteristics are suitable for use in a harsh environment, and the characteristics can be maintained for a long time.

Next, as is clear from FIG. 1, the crystallization rate of polyether nitrile is the highest at around 240 ° C.,
Therefore, according to the manufacturing method of the present application, it is possible to efficiently manufacture a vibrating component using the excellent crystallized polyether nitrile resin.

Further, as is clear from FIG. 2, since the uncrystallized polyether nitrile resin has the smallest elastic modulus in the temperature range above the heat distortion temperature at which molding is possible, molding can be performed most easily.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a crystallization rate of a polyether nitrile resin.

FIG. 2 is an explanatory diagram of Young's modulus characteristics of polyether nitrile resin.

Claims (3)

[Claims] 1. A vibrating component used in an electroacoustic transducer, wherein a polyether nitrile resin is used. 2. The vibrating component according to claim 1, wherein the polyether nitrile resin is a crystallized polyether nitrile resin. 3. A vibrating component material using the polyether nitrile resin is molded into a shape of a vibrating component, and then 200
A method of manufacturing a vibrating component, characterized in that the vibrating component material is crystallized in a temperature range of ° C to 260 ° C.