JP3060732B2 - Edge for speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edge for supporting a diaphragm of a loudspeaker used for various kinds of audio equipment inside a frame, and a method of manufacturing the same.

[0002]

2. Description of the Related Art As shown in FIGS. 3 and 4, a diaphragm of a loudspeaker comprises a diaphragm main body 10 which emits sound and a flexible edge 11 for supporting the diaphragm main body 10.
A fixed edge in which the outer periphery of the diaphragm main body 10 is thinned to increase flexibility as shown in the cross section in FIG. 3 and another flexible material different from the diaphragm main body 10 as shown in the cross section in FIG. And free edges made from Of these, the fixed edge of FIG. 3 is poor in flexibility and strength but has a simple structure, so it is mainly used for inexpensive speakers, and the free edge is mainly used for high input and high fidelity speakers. Due to the trend toward higher-grade audio equipment in recent years,
Free edges also tend to be used for general speakers.

[0003] The free edge is made of an edge made of a lightweight material such as a polyether or polyester foam urethane sheet alone, and a fibrous base material such as a woven or non-woven fabric of stretched polyethylene terephthalate (stretched PET) fiber. There are edges that are formed by impregnating a molding material resin or hot-pressing a laminated material coated with a rubber material.Both of them are flexible, lightweight, and suppress the split resonance of the diaphragm and the resonance of the edge itself. It is required that the mechanical internal loss (tan δ) necessary for improving the frequency characteristics is large, that the wettability with the excipient resin is good, and the like.

[0004]

In the conventional free edge having such a structure, the edge made of the urethane foam sheet alone is relatively inexpensive, but the foam has a substantial surface area due to foaming, so that the moisture resistance, Poor weather resistance,
An edge formed by impregnating a stretched PET fiber cloth with a shaping material resin such as phenol resin and hot-pressing does not have a large tan δ and has poor wettability with the shaping material resin such as phenol resin. However, there is a problem to be solved that durability is poor.

Accordingly, the present invention solves the above-mentioned disadvantages of the prior art, improves the followability and durability of the diaphragm during vibration,
It is another object of the present invention to provide a speaker having excellent quality by obtaining an edge having a sufficient TANδ and improving the frequency characteristics of the speaker.

[0006]

The loudspeaker edge according to the present invention for achieving the above object will be described with reference to FIGS. 1 and 2 showing the cross section and detailed configuration of the edge of the embodiment. A speaker edge 1 adhered to an outer peripheral portion of a diaphragm main body 5 and supporting the diaphragm main body so as to be capable of vibrating, the conjugate having a polyester resin 3 inside, and a polyamide resin 4 covering the exterior. Gate fiber 2
A woven or non-woven fabric made of is impregnated with 10 to 15% by weight of a phenol resin as a shaping material, and heated to an edge shape.
It is characterized by being obtained by pressing.

[0007]

The outer edge of the present invention is made of a polyamide resin as shown in FIG. 2, and as shown in Table 1, the value of tan .delta. And the wettability index is increased by about 10%. Therefore, as shown in the frequency characteristic indicated by the solid line in FIG. 5, the large dip in the middle sound range is improved and flattened as compared with the characteristic of the conventional example indicated by the dotted line.

Further, the polyester inside the conjugate fiber 2 has a low elasticity and is excellent in dimensional stability.

[0009]

[Table 1]

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Conjugate fiber 2 used in the present invention
Uses PET resin as the polyester-based resin 3 and nylon 66 as the polyamide-based resin 4, and the respective molten polymers are fused and simultaneously spun.

Next, the polyester has a second transition temperature of 60.
Below 80 ° C. and the secondary transition temperature of polyamide-3
Heat stretching was carried out at a temperature between 45 and 60 ° C. higher than 0 to 45 ° C. In this stretching step, 3 parts of the polyester were difficult to deform because the polymer arrangement was frozen, and 4 parts of the polyamide were When the polymer is frozen, an eccentric sheath-type bicomponent fiber as shown in FIG. 2 is formed. In such a conjugate fiber, the molecular group in the polyamide or polyester is oriented in the stretching direction, and a fibril-like crystal having a suggestion of a wildfire is generated. For this reason, this fiber is characterized by a very high strength.

A woven fabric substrate made of this eccentric core-sheath type bicomponent fiber having an apparent thickness of 50 microns is used.
The resin is impregnated with 10 to 15% by weight of a phenol resin as a molding material resin, at a molding temperature of 260 to 290 ° C. and a pressure of 1 kg / cm.
^The sheet was heated and pressed under 10 for 10 to 12 seconds to obtain a speaker edge 1.

As a conventional example for comparison, an oriented PET fiber woven fabric was used as a woven fabric substrate, an edge was obtained in the same process as in the example, a 16 cm speaker was assembled together with the edge of the example, and the frequency characteristics were measured. FIG. In the characteristic table of the same figure, a solid line is an example and a dotted line is a conventional example.

Although the speaker edge according to the present invention has been described in detail based on the examples which are considered to be representative, the embodiment of the edge according to the present invention is applicable to two kinds of resin components forming a conjugate fiber. In the present invention, the present invention is not limited to the structure of the above-described embodiment. However, as long as it has the effects described below, it can be implemented with appropriate modification.

[0015]

The speaker edge according to the present invention has the following effects. (1) First, as is clear from Table 1, the conjugate fiber of the example is surrounded by a polyamide resin having excellent heat resistance on the outside as shown in FIG. According to the triple, as shown in FIG. 5, anti-phase vibration (edge resonance) with the diaphragm in the midrange is prevented, the frequency characteristics are flattened, and a reproduced sound of excellent quality is obtained. In addition, since the wettability index of the individual is improved by about 10%, the molded edge base material is mechanically stable and has excellent adhesiveness to resin, so that a long life as a speaker can be obtained. .
The deterioration rate is 1/2 or less, and therefore, a product having a long life and stable performance can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a speaker edge according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view illustrating a configuration of a main part of the embodiment.

FIG. 3 is a cross-sectional view of a conventional example edge.

FIG. 4 is a cross-sectional view of another conventional example edge.

FIG. 5 is a frequency characteristic diagram comparing a speaker using an example edge with a speaker using a conventional edge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Edge for speaker 2 Conjugate fiber 3 Polyester resin 4 Polyamide resin 5 Cone type diaphragm

Claims (1)

(57) [Claims] 1. A woven or non-woven fabric comprising a conjugate fiber (2) coated with a polyester resin (3) inside and a polyamide resin (4) in an outer layer, and a phenol resin as a shaping material. An edge (1) for a loudspeaker, which is obtained by impregnating an edge by heating and pressing to an edge shape.