JPS59135998A - Edge for speaker - Google Patents

Abstract

PURPOSE:To decrease change in lapse of times and to increase fixation by forming a base cloth with a hydrophobic fiber and impregnating a filling resin layer into a minute hole. CONSTITUTION:The base cloth 18 is formed by knitting weft 20 and warp 19 made of polyester fiber 17, a phenol resin or rubber system resin is impregnated and formed by the thermal forming. Thus, since a part of the rubber system resin layer 22 or the thermosetting resin layer 21 is impregnated into a hollow part 17a or a minute hole 17b of the fiber 17, the filling resin layer 22 and the forming thermosetting resin layer 21 are fixed strongly to the base cloth 18.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a speaker edge applied to general audio equipment.

Conventional Structure and Problems The speaker has a cloth edge 2 attached to the end of a cone diaphragm 1, as shown in FIGS. 1 and 2. 3
is a plate with a pole piece, 4 is a ring-shaped magnet,
5 is the top plate, 6 is the peel-off coil, 71-i damper, and 8 is the dust cap.

9 is a frame, and 10 is a gasket. This cloth edge 2 is made by knitting warp yarns 11 and weft yarns 12, which are cotton fibers, to form a base cloth 13, as shown in Fig. M3, and a rubber resin 14 such as SBR, urethane rubber, acrylic rubber, etc. The fabric edge 2 for a speaker is obtained by impregnating it with a thermosetting resin 15, such as a phenolic resin, and then subjecting it to heating and pressure molding.

However, the cotton-based cloth edges have poor moisture resistance and are easily deformed in high-temperature and humid atmospheres, and their heat resistance and weather resistance are not good either, so they are used for outdoor speakers, car speakers, etc. In this case, flexibility may be lost due to deterioration, and cracks may occur in the edges 2 due to decreased strength. In particular, due to the high input power of speakers in recent years,
Due to the above factors, many abnormal speaker noises occurred.

In order to prevent these drawbacks, instead of the above cotton fiber,
A proposal has been made to construct the base fabric 13 from hydrophobic fibers that are less affected by organic solvents and moisture, such as polyester fibers 16, as shown in FIG. Another drawback was that it was very difficult to impregnate with molding resin.

Purpose of the Invention The purpose of the present invention is to provide an edge for a speaker that has excellent weather resistance and moisture resistance, has little change over time, and is capable of firmly fixing a sealing resin layer and a molding resin layer to a base fabric. .

Structure of the Invention The speaker edge of the present invention comprises a base fabric formed by knitting hydrophobic fibers having a large number of micropores extending inwardly on the fiber surface, and a base fabric laminated on one side of the base fabric. a molding resin layer in which a portion of the hydrophobic fiber is infiltrated into the micropores of the hydrophobic fiber;
The sealing resin layer is laminated on the other side of the base fabric and a part of the resin layer penetrates into the micropores of the hydrophobic fibers. In this way, since the base fabric is formed from hydrophobic fibers, it has excellent weather resistance and moisture resistance, and has little deterioration over time. In addition, since micropores are provided in the hydrophobic fibers and a portion of the filler resin layer and the molding resin layer are penetrated into the micropores, these resin layers can be firmly fixed to the base fabric.

DESCRIPTION OF EMBODIMENTS A major embodiment of the present invention will be described with reference to FIGS. 5 and 6. This speaker edge uses polyester fiber 17f shown in Figure 5 instead of the conventional cotton fiber! r: is used to form the base fabric 18 shown in FIG.

This polyester fiber 17 has a hollow portion 17a f extending in the longitudinal direction of the fiber at the center of the fiber.

Micropores 17b having a diameter of 0.01 to 3 μm are uniformly distributed on the fiber surface, and some of the micropores 17b penetrate from the fiber surface to the hollow portion 17a. Such fibers 17 are currently sold as "Welky" by Kadai (c). That is, the speaker edge of this example is
As shown in FIG. 6, the entire base fabric 18 is formed by knitting warp 19 and 2° weft made of the polyester fibers 17, impregnated with phenol resin and rubber resin, and formed by thermoforming. When formed in this manner, since the fibers 17 are provided with micropores 17b, the phenolic resin for molding and the rubber resin for sealing easily permeate through the micropores 17b into the hollow portion 17a due to capillary action. A thermosetting resin layer 21 is laminated on one side of the base fabric 18, a part of which penetrates into the hollow part 17a through the micropores 17b, and a part of the thermosetting resin layer 21 penetrates into the hollow part 17a through the micropores 17b on the other side of the base fabric 18. The rubber-based resin layer 22 that has entered the portion 17a is laminated. In addition, the phenol resin impregnation rate with respect to the base fabric 18 is 2 to 20% by weight.

The rubber resin impregnation rate is 5 to 50% by weight. Further, the molding process is performed at 160 to 200°C for 5 to 10 seconds. Since the edge 23 thus obtained has a base fabric 18 made of polyester fiber 17, which is a hydrophobic fiber, it has excellent moisture resistance and good weather resistance. It has the effect of having performance with little change over time and little deformation. In addition, the rubber resin layer 2
2 or a part of the thermosetting resin layer 21 is the hollow part 17 of the fiber 17.
a and the micropores 17b, both tooth fat layers 21.
22 can be firmly fixed to the base fabric 18.

Example Using the polyester fiber 17 described above, a base fabric with a yarn thickness equivalent to 60 yarn count (2 twists) and a number of stitches of 90 vertically x 92 horizontally was formed, and acrylic and urethane copolymer was added to this. After incorporating 30% by weight of the combined rubber-based resin, 10% of the phenolic resin was added.
Edge cloth is removed by weight impregnation treatment (9.180℃
The edge of this experimental example was obtained by molding with 5 SeC. The results of a comparison between this and conventional products are as follows.

(1) Moisture resistance - After leaving it in an atmosphere of 55°C for 500 hours, check the condition of the edges. The cone was made of polyglobylene resin, which does not easily deform under humidity, and an edge was attached to it for comparison.

〔exterior〕

[FO change] (2) Weather resistance test: After irradiation with ultraviolet rays for 150 hours, the fo change and tear strength (in the vertical direction) were measured.

[fo change]

[Tear strength] There was almost no deformation in both cases, but the edge with cotton as the base fabric showed significant deterioration.

(3) Heat resistance test: Changes in physical strength (tear strength) were measured after being left in a temperature bath at 85° C. for 100 hours.

(Margin below) The product of the present invention has less strength deterioration in terms of heat resistance than the edge made of cotton base fabric.

Effect of the invention According to the speaker edge of this invention, it is weather resistant.

It has excellent moisture resistance, little change over time, and has the effect of firmly adhering the sealing resin layer and molding resin layer to the base fabric.

[Brief explanation of the drawing]

Fig. 1 is a new view of the speaker, Fig. 2 is a sectional view of a conventional speaker edge, Fig. 3 is an enlarged sectional view thereof, Fig. 4 is a perspective view of the polyester fiber used in the proposed example, and Fig. 5 The figure is a perspective view of a polyester fiber used in one embodiment of the present invention, and FIG. 6 is an enlarged sectional view of the main part of this embodiment. 17... Polyester fiber, 17a... Hollow part, 17
b... Micropores, 18... Base fabric, 21... Thermosetting resin layer for molding, 22 Rubber resin layer for top soil, 23... Edge Figure 1 115 Figure 2 Figure 3 Figure 6

Claims (2)

[Claims] (1) A base fabric formed by knitting hydrophobic fibers with many fine pores extending inward on the fiber surface, and a part of the fine hydrophobic fibers formed by laminating on one side of this base fabric. A speaker edge fully equipped with a molding resin layer that has penetrated into the holes, and a sealing resin layer that has been laminated on the other side of the base fabric and that has partially penetrated into the micropores of the hydrophobic fibers. (2) The hydrophobic fiber has a hollow part extending in the longitudinal direction of the fiber and communicating with the micropores in the center thereof, and a part of the molding resin layer and the sealing resin layer are formed in the hollow part. A speaker edge according to claim (1), in which each of the speaker edges is intruded.