JPH06261392A - Vibration system for speaker - Google Patents

Abstract

PURPOSE:To improve a thermal resistant characteristic and an adhesive characteristic of the device at a low cost by using a dome diaphragm formed by polyester polycarbonate resin film. CONSTITUTION:A dome type diaphragm 1 with dome type speaker consisting of a dome diaphragm 1, voice coil 2, magnetic circuit 3, and frame 4 is obtained by forming the polyester polycarbonate resin film. The polyester polycabonate resin being the material is made of the copolymerization between the polyester resin and the polycarbonate resin. In short, the thermal deformation temperature of the polyester resin is low and the solvent resistant characteristic is superior but the adhesive characteristic is inferior. On the other hand, the thermal deformation temperature of the polycarbonate resin is high and the solvent resistant characteristic is inferior, but the adhesive characteristic is superior. When it becomes the copolymerization, the features of the both resins are combined and their faults are supplemented, resulting in improving the thermal resistant characteristic (thermal deformation temperature), solvent resistant characteristic, and adhesive characteristic. Thus, the formation is easy and the production is good, resulting in improving the reliability of the product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention improves performance by using an ordinary diaphragm used for a speaker, a diaphragm having a composite structure, or an improved material suitable for constituting a vibration system component such as a dust cap. The present invention relates to the above vibration system component.

[0002]

2. Description of the Related Art Conventionally, in the case of a diaphragm, for example, when the material forming the parts of the vibration system of the speaker is a diaphragm, even if the diaphragm is made of a single material, vibration of a composite structure composed of a skin and a core like a honeycomb flat plate Even with a plate, in order to make the frequency characteristic of the reproduction band wide and flat, high elasticity is provided to increase the split vibration frequency, and high internal loss is provided to suppress split resonance in the high range. Various materials have been used from the past, but few materials have achieved both of these properties in a well-balanced manner, and pulp that is relatively close to the required properties and can be mass-produced. A diaphragm using is used frequently.

However, a diaphragm made of pulp often lacks in elastic modulus. Particularly, in a diaphragm for a high-pitched speaker, a single metal or a surface-treated metal diaphragm is used. However, there is a drawback in that the frequency characteristics have a remarkable unevenness, which often gives an uncomfortable feeling to the listener.

To solve this drawback, a diaphragm using a resin film is used. Polyimide or the like is used when heat resistance is required and high elasticity is required, but it has poor moldability and has a small internal loss.
A diaphragm using a polyester resin film is often used when heat resistance of about 100 ° C. is sufficient.

Further, in the cone type speaker, the dust cap adhered to the base of the cone type diaphragm has an original dustproof function of preventing foreign matter from entering the magnetic gap and causing malfunction. , Prevent deformation of the diaphragm,
In addition, when the diaphragm vibrates abnormally, it has the effect of absorbing the vibration energy to suppress the abnormal vibration and improving the frequency characteristics, so high rigidity and high internal loss are required as with the diaphragm. And a material similar to the diaphragm is used.

[0006]

A diaphragm and a dust cap using a conventional polyester resin film having such a structure are inexpensive but have low heat resistance and lack adhesiveness, so that the price is low. There is a problem to be solved that it is difficult to improve the heat resistance and the adhesiveness under the restriction of 1 and obtain a highly reliable product.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art and uses a polyester polycarbonate resin film in place of the polyester resin, so that the dome diaphragm, the dust cap and the dome diaphragm which are inexpensive and have excellent heat resistance and adhesiveness are provided. It is an object to provide a vibration system component such as a honeycomb structure diaphragm.

[0008]

1 to 5 showing an embodiment of a vibration system component according to the present invention for achieving the above object.
The first invention is a shaped diaphragm obtained by molding a polyester polycarbonate resin film.

The second invention is a dust cap obtained by molding a polyester polycarbonate resin film.

A third aspect of the present invention is a honeycomb vibrating plate, characterized in that a film made of a polyester polycarbonate resin is used as a skin material.

[0011]

In the vibration system component having such a structure, the polyester polycarbonate resin as a material is a copolymer of polyester resin and polycarbonate resin. That is, as is well known, the polyester resin has a low heat distortion temperature and good solvent resistance, but poor adhesion.
On the other hand, the polycarbonate resin has a high heat distortion temperature and is not good in solvent resistance but good in adhesiveness. Therefore, in the case of a copolymer, the properties of both resins are added to complement the defects, and the heat resistance (heat distortion temperature), solvent resistance, and adhesiveness are improved.

The heat resistance of the polyester polycarbonate resin of the present invention is about 7 times that of the conventional polyester resin as shown in Table 1 in consideration of the heat resistance of the polycarbonate resin.
While it is 0 ° C, it is as high as about 135 ° C.

[0013]

[Table 1] Regarding the adhesiveness, the experimental result of observing the adhesive force to the canvas using the rubber-based adhesive most commonly used in the speaker assembly for the 1-inch wide sample shows that the conventional polyester resin is About 0.5 (K
gf), the polyester polycarbonate resin is 1.5 (Kgf), which is about 3 times.

[0014]

[Table 2] As for solvent resistance, as shown in Table 3, the polycarbonate resin was found to be 1
The polyester polycarbonate resin does not swell even after 10 minutes, while it swells completely in minutes.

[0015]

[Table 3] Among the physical properties of the material, Young's modulus (related to rigidity) and t
As shown in Table 4, an δ (internal loss) is larger than that of polycarbonate, which is one of the constituents, and particularly tan δ that contributes to flattening the frequency characteristics of the speaker is much larger than that of polyester, which is the other constituent. It shows a close value.

[0016]

[Table 4] Therefore, when it is incorporated into a speaker as a dome-shaped diaphragm or a flat plate diaphragm having a honeycomb structure as shown in FIGS. 1 to 3, the same characteristics as a speaker using a conventional polyester resin film, adhesiveness, heat resistance, and Since it has excellent solvent resistance, it is expected to have improved performance and reliability as compared with the conventional example.

As described above, since the lack of heat resistance and adhesiveness of the polyester resin is compensated for by the polycarbonate resin,
The material itself is less expensive than the conventionally used polyimide and the like, is easy to mold, and has excellent adhesiveness and solvent resistance, so that it has good productivity in the speaker manufacturing process. Further, the diaphragm has a Young's modulus and internal loss comparable to those of conventional polyester resins, and has good frequency characteristics. Therefore, it is possible to inexpensively provide a speaker having excellent reliability and performance without significantly increasing the component price.

[0018]

EXAMPLES Examples of the present invention will be described in detail. A polyester polycarbonate resin obtained by reacting bisphenol A and terephthalic acid with phosgene is rolled into a film having a required thickness corresponding to each part of the vibration system. A polyester polycarbonate resin film was used as the constituent material of the vibration system component.

In the dome-shaped diaphragm of the first invention, a polyester polycarbonate resin film having a thickness of 50 μm is heated by a heater at about 200 ° C., and then pressed at about 160 ° C. with a die having a diameter of 30 mm. A dome-shaped diaphragm was molded to obtain a dome-shaped speaker having a known structure including the dome-shaped diaphragm 1, the voice coil 2, the magnetic circuit 3 and the frame 4 as shown in the schematic structure of FIG. Further, a dome-shaped diaphragm having the same size was manufactured from a polyester film, and a speaker having the same structure was assembled to be a conventional example for comparison.

The dust cap of the second invention has a thickness of 100.
A μm polyester polycarbonate resin film was press-molded under the same conditions as the dome-shaped diaphragm to obtain a spherical dust cap 5 whose cross section is shown in FIG. The dust cap 5 is adhered to the vicinity of the base of the cone-shaped diaphragm 7 having a known structure by the peripheral portion 5a.

In the honeycomb diaphragm 6 of the third invention whose cross section is shown in FIG. 3, a polyester polycarbonate resin film having a thickness of 100 μm is cut into a size of 60 mm × 60 mm to form a skin material 6a having a cell size of 3 mm and a thickness of 2 mm. .8m
The objective plate-shaped honeycomb vibrating plate 6 was obtained by adhering both sides of the aluminum honeycomb core 6b of m. The honeycomb vibration plate 6
The voice coil 2 is adhered to the back surface of the above and combined with the magnetic circuit 3 and the frame 4 to form a flat speaker having a known structure whose schematic cross section is shown in FIG. Also, for the flat panel type speaker using the honeycomb diaphragm of the third aspect of the present invention, a honeycomb diaphragm having a skin material made of polyester was manufactured, and speakers having the same structure were assembled to form a conventional example for comparison.

The vibration system component of the speaker according to the present invention has been described above in detail with reference to an example considered to be typical. However, the embodiment of the vibration system component according to the present invention is limited to the structure of the above embodiment. However, for example, although not described in detail, the diaphragm of the first invention may have a cone shape as shown in FIG. 2 and so on. The present invention can be appropriately modified and carried out as long as it exhibits the action of the invention and has the effects described below.

[0023]

[Effect] The vibration system component for the speaker according to the present invention has the following effects.

As shown in Table 1, the polyester polycarbonate resin as the material (1) has a temperature of about 135 ° C., which is nearly 200% higher than that of the conventional polyester resin of about 70 ° C. Therefore, the molding is easier as compared with the polyimide resin film.

(2) Adhesiveness is improved as shown in Table 2 and solvent resistance is improved as much as polycarbonate resin as compared with polyester resin. Therefore, in combination with the effect of (1) above, the productivity is good and the reliability of the product is improved in the speaker manufacturing process.

(3) Regarding the rigidity and internal loss of the material, Table 4
As shown in, it has a value close to that of polyester resin.

(4) It is cheaper than the polyimide resin film. Therefore, the manufacturing cost can be kept low.

With the above advantages, there is an effect that a speaker having excellent reliability and performance can be provided at a low cost without significantly increasing the price of parts.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a dome-shaped speaker using a dome-shaped diaphragm according to the first invention.

FIG. 2 is a sectional view of a peripheral portion related to the dust cap according to the second invention.

FIG. 3 is a schematic cross-sectional view of a flat panel speaker using the honeycomb diaphragm according to the fourth invention.

[Explanation of symbols]

 1 Dome type diaphragm 2 Voice coil 3 Magnetic circuit 4 Frame 5 Dust cap 6 Honeycomb diaphragm 7 Cone type diaphragm

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location H04R 7/12 A 8421-5H 9/02 A 8421-5H // C08J 5/12 CFD 9267-4F

Claims (4)

[Claims] 1. A diaphragm obtained by molding a polyester polycarbonate resin film. 2. The diaphragm according to claim 1, wherein the diaphragm is a dome-shaped diaphragm. 3. A dust cap for a speaker, which is obtained by molding a polyester polycarbonate resin film. 4. A honeycomb vibrating plate comprising a polyester polycarbonate resin film obtained by rolling a polyester polycarbonate resin as a skin material.