JPH05328489A - Speaker edge and its production - Google Patents

Abstract

PURPOSE:To ensure the effective water resistance performance at a speaker edge without increasing the edge weight by applying the thermal press molding to an expanded polyurethane sheet attached with the synthetic resin including a fluorine group at its end. CONSTITUTION:A continuous slice sheet is obtained by slicing a foamed polyurethane resin of a polyester group and then soaked in the emulsion aqueous solution of the acrylic resin 5 including a fluorine group at its end. In this process, the slice sheet is compressed in the aqueous solution so that the air is discharged out of the bubbles 3. Thus most of bubbles 3 are filled with the emulsion. Then the emulsion is pressed out with compression of the sheet so that a drying process is accelerated. The sheet undergoes the press molding after the heating and drying processes. Thus a roll-shaped edge 2 is obtained as a molded product. Then the edge 2 is bonded at the outer fringe part of a diaphragm 1. In such a way, a speaker diaphragm is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker edge used in various audio equipment and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a waterproof urethane urethane type edge used in a vehicle-mounted door mount speaker or the like has been constructed as shown in FIGS. 4, 5 and 6, 7. That is, as shown in FIGS. 4 and 5, the edge 2 formed by hot press molding is applied or dipping a solution of synthetic resin in a post-process, and a skin layer 6 of synthetic resin is attached to the surface of the edge, or FIG. As shown in FIG. 7, the infiltration of water is prevented by adopting a structure in which the synthetic resin film 7 is provided on the surface when hot press molding is performed.

[0003]

However, in the above-mentioned conventional structure, when the skin layer 6 of synthetic resin for preventing the infiltration of water is adhered or the synthetic resin film 7 is provided, the edge becomes heavy and the sound pressure of the speaker is increased. However, there was a problem that Further, in each of the methods, there is a problem that the waterproof property is lost if the surface is scratched due to a handling accident or the like because the resin layer for preventing water from entering is only on the surface. Further, in the above-mentioned conventional structure, there is a problem that the manufacturing process of the edge is increased to two processes and the manufacturing cost is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above conventional problems and provide a speaker edge capable of exhibiting excellent waterproof performance and a manufacturing method thereof.

[0005]

In order to solve the above-mentioned problems, the present invention is to form an edge by hot press molding a urethane foam sheet having a synthetic resin having a fluorine group attached to its end.

Further, in order to uniformly attach the synthetic resin having a fluorine group at the terminal to the entire urethane foam, a foam sheet obtained by slicing a urethane bread foam is used as an emulsion of a synthetic resin having a fluorine group at the terminal. Impregnate the liquid,
A sheet obtained by filling most of the bubbles of urethane foam with an emulsion liquid and then drying is hot-press molded to form a speaker edge.

[0007]

[Function] Synthetic resin having a fluorine group at the terminal has water repellency, and since it adheres to the urethane foam in a very small amount, the waterproof performance as an edge can be satisfied, so the weight of the edge does not increase. .. In addition, since the entire urethane foam formed by the edge has a waterproof property, the waterproof property will not be lost due to scratches in handling.

Further, since the synthetic resin having a fluorine group at the terminal is collectively attached at the stage of the urethane foam sheet before the molding of the edge, the number of manufacturing steps is not two, and the manufacturing cost is not increased.

[0009]

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

FIG. 1 is a perspective view showing the structure of a speaker edge according to the present invention, and FIG. 2 is an enlarged cross-sectional view of the main part thereof. In FIGS. 1 and 2, a continuous sliced sheet having a thickness of 7 mm is obtained from the bread foam 4 (density: 0.030 g / cm ³ ) of the polyester polyurethane resin for the edge 2. An emulsion of acrylic resin 5 having a fluorine group at the end (Dickguard F-4 manufactured by Dainippon Ink and Chemicals, Inc.
It is impregnated with a 5 times diluted aqueous solution of (00). At this time, the sheet is compressed in the liquid so that the air in the bubbles 3 escapes so that most of the bubbles 3 of the urethane foam are filled with the emulsion liquid. The sheet is then compressed to squeeze the emulsion liquor to speed up the liquor drying. After the sheet is dried by heating, it is press-molded for 30 seconds in a press die heated to 200 ° C. to obtain a roll-shaped edge 2 having a thickness of 0.8 mm as shown in FIG. This is attached to the outer peripheral edge of the diaphragm 1 to form a speaker diaphragm.

With respect to the speaker edge configured as described above, a cylinder 8 is arranged on the back surface of the edge 2 via a packing 9 as shown in FIG. 3, and water 10 is placed in the cylinder 8 at a minimum water depth of 30 mm. A waterproof test was conducted in which the water was stored and left for 96 hours, but no water leakage occurred. Furthermore, after rubbing the edge surface 5 times with a 400 grit sandpaper at a pressure of 500 g / cm for a part of the edge 2,
A similar waterproof test was conducted, but no water leak occurred.

[0012]

As described above, since the speaker edge according to the present invention is formed by hot press molding a urethane foam sheet having a synthetic resin having a fluorine group at the end attached to the inner wall of the bubble, the weight of the edge is increased. The waterproof performance can be effectively obtained without increasing the number of edges and the number of manufacturing steps of the edge, which is of great industrial value.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a main portion showing a configuration of a speaker edge according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the main part.

FIG. 3 is an explanatory view showing a waterproof test of the same edge.

FIG. 4 is a partially cutaway perspective view of a main part of a conventional speaker edge.

FIG. 5 is an enlarged cross-sectional view of the relevant part.

FIG. 6 is a partially cutaway perspective view of a main part of another conventional speaker edge.

FIG. 7 is an enlarged sectional view of the main part.

[Explanation of symbols]

 1 Vibration Plate 2 Edge 3 Bubble 4 Pan Foam 5 Acrylic Resin

Claims (2)

[Claims] 1. A speaker edge formed by hot pressing a urethane foam material having a synthetic resin having a fluorine group attached to its end. 2. A sheet obtained by slicing a bread foam of urethane foam into an emulsion liquid of a synthetic resin having a fluorine group at the terminal to impregnate it, and most of the bubbles of the urethane foam are filled with the emulsion liquid. A method for manufacturing a speaker edge, in which a sheet obtained by post-drying is hot-press molded.