KR100266536B1 - Speaker for vibration plate and method for manufacturing the same - Google Patents

Abstract

PURPOSE: A vibration plate for speaker and a manufacturing method thereof are provided to increase elasticity and improve the frequency characteristics using carbon UDPP(Uni Direction Pre-Preg). CONSTITUTION: The vibration plate for speaker includes a pair of carbon UDPPs(Uni Direction Pre-Preg)(1,2) and a honey comb structure(3) between the UDPPs(1,2). In the method of manufacturing the vibration plate, in step one, more than two sheets of carbon UDPP are arranged and tailored. In step two, The tailored carbon UDPP is divided into several parts in a radial direction and folded to make the adequate shape. In step three, the honey comb core(3) is tailored to make the adequate shape. In step four, the tailored honey comb core(3) is placed on the UDPP(1). In step five, the other UDPP(2) is placed on the other side of the honey comb core and heated to make the adequate shape.

Description

SPEAKER FOR VIBRATION PLATE AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to a diaphragm for a speaker and a method of manufacturing the same, and more particularly, to a diaphragm for a speaker and a method for manufacturing the same, using a carbon UDPP (Uni Direction Pre-Preg) as a material to increase elastic modulus and improve frequency characteristics.

In general, a speaker for the purpose of expanding and reproducing voice generates a sound by converting electrical force input through a coil into mechanical vibration in a magnetic field generated by a magnet. It is important as a factor in determining the nature.

The diaphragm for the speaker using a conventional carbon fiber was manufactured by impregnating a woven carbon fiber in a thermosetting resin and thermoforming it.

In addition, a sealant was applied to prevent air leakage through the holes present in the thermoformed molding.

By the way, in the conventional diaphragm for loudspeakers comprised in this way, there exists a working trouble in the process of shape | molding the carbon fiber of a woven fabric in the form of a diaphragm in the plane weaving state. For example, the necessity of preforming in order to prevent warping of warp or weft yarn, or the need for a sealing process for filling holes existing in the molded article after molding, etc. are required.

In addition, the physical properties of the diaphragm made in this way, but the carbon fiber material, there is a disadvantage that the high elastic modulus of the carbon fiber can not be saved 100% due to taking the form of a woven fabric.

And, in addition to the carbon fiber, what actually takes up most of the diaphragm material, such as pulp (polyp), polypropylene (Poly Proplyene), etc., these materials had a problem that can not sufficiently reproduce the high sound due to low elastic modulus.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to provide a diaphragm for a speaker and a method of manufacturing the same by using carbon UDPP as a material to increase the elastic modulus and improve the frequency characteristics.

1 is a plan view of the carbon UDPP used in the present invention

2 is a structural diagram made of a similar fabric by overlapping two carbon UDPP shown in FIG.

3 is a structural diagram cut into three parts to make a diaphragm body using the similar fabric shown in FIG.

4 is a structural diagram of the cut pieces shown in Figure 3 assembled in the shape of a diaphragm

5 is a cross-sectional view of the speaker diaphragm according to the first embodiment of the present invention.

6 is a cross-sectional view of a speaker diaphragm according to a second embodiment of the present invention.

7 is a cross-sectional view of a speaker diaphragm according to a third embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: Carbon UDPP 2: Carbon UDPP or other material

3: core 4: pulp

In the speaker diaphragm of the present invention for achieving the above object, in the speaker diaphragm, the diaphragm is laminated with at least two unit carbon UDPP formed by drying in a semi-cured state the carbon fibers in close contact with one another, The fiber arrangement direction of the laminated unit carbon UDPP is formed by laminating at right angles or at an arbitrary angle and then cutting radially.

Another speaker diaphragm of the present invention for achieving the above object is a speaker having a diaphragm having a honeycomb structure and a carbon fiber bonded to both surfaces of the core and in close contact with one direction, wherein the carbon fiber is a resin Carbon UDPP dried in a semi-cured state after impregnation.

In the method of manufacturing a diaphragm for a speaker of the present invention for achieving the above object, in the method for manufacturing a diaphragm for a speaker, two or more carbon UDPPs are laminated so that a fiber arrangement direction is perpendicular or at an arbitrary angle, and the stacked carbon UDPPs are laminated. Cutting the laminate, dividing the laminated carbon carbon UDPp radially into a predetermined shape, cutting the core of the honeycomb structure into a predetermined shape, placing the carbon UDPP on a mold, and placing the carbon UDPP The process of placing the core on the surface, and the process of thermoforming by placing the other carbon UDPP on the surface of the core that is not in contact with the carbon UDPP.

Another method of manufacturing a diaphragm for a speaker of the present invention for achieving the above object is a method of manufacturing a diaphragm for a speaker, the process of laminating two or more carbon UDPP so that the fiber arrangement direction to form a right angle or an arbitrary angle, and the laminated The carbon UDPP is radially divided into parts to be assembled into a predetermined diaphragm shape, and a surface skin material such as a pulp diaphragm, a woven fabric, and a nonwoven fabric is placed on a mold, and the carbon UDPP pieces are placed thereon and thermoformed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a plan view of the carbon UDPP used in the present invention, Figure 2 is a structural diagram made of a similar fabric by overlapping two carbon UDPP shown in Figure 1, Figure 3 using a similar fabric shown in Figure 2 Figure 3 is a structural diagram cut into three parts to make a diaphragm body, Figure 4 is a structural diagram of the cut pieces shown in Figure 3 assembled into a diaphragm shape, Figure 5 is a cross-sectional view of the speaker diaphragm according to the first embodiment of the present invention. .

In the present invention, as shown in FIG. 1, the carbon fiber is dense by using UDPP (Uni Direction Pre-Preg) dried in a semi-cured state after impregnating the resin in a state in which carbon fibers are closely aligned in one direction or in a straight line. The UDPP 1 is manufactured.

Figure 2 is a stack of a plurality of high-density carbon UDPP (1) prepared in Figure 1 in consideration of the weight and thickness of the diaphragm. At this time, in the overlapping method, the arrangement direction of the fibers may cross at right angles, or an arbitrary crossing angle may be set, and the number of overlapping sheets may also be set according to a desired standard.

The material thus made is not woven, but it can achieve much higher densities than the woven fabric because it does not cause bending, warping of the fibers for interfiber bonding, or the space generated when the weft crosses. In addition, the bonding force between fibers is secured by thermal strengthening of the binder (reinforcing agent) impregnated in the fiber, and thus forms a nonwoven fabric having higher physical properties than the woven fabric.

In order to mold the material in an overlapped state as in the above process, the diaphragm may be manufactured by rolling in a conical shape and thermoforming as it is. However, in order to balance the physical properties of each part of the diaphragm, it is preferable that each part is symmetrical with respect to the center point of the diaphragm, or arranged in a certain direction so that the direction of the diaphragm can be used. Is divided radially into several parts (shown in three parts in FIG. 3), and the material is cut to be assembled and molded as shown in FIG.

As described above, the cut materials are formed into a diaphragm shape and placed on a mold to be thermoformed.

In order to achieve a sufficiently strong adhesion between the materials which have been divided into several parts by molding the materials to the shape of the diaphragm, the divided materials may be formed without being overlapped by being molded in a partially overlapped state or compounded with a separate diaphragm material. There are ways to do it.

5 is a cross-sectional view of the completed diaphragm body, which is completed by cutting the inner and outer diameters to remove unnecessary parts from the molded article.

In order to adjust the external appearance of the molded article, the external appearance may be adjusted by using lacquer or paint on the surface of the diaphragm.

6 is a structural diagram of a loudspeaker diaphragm according to a second embodiment of the present invention, wherein a carbon UDPP (1) (2) is used as the skin material on the front or both sides of the diaphragm to form a honeycomb core 3 Shows a diaphragm having a composite structure bonded to both surfaces.

7 is a structural diagram of a loudspeaker diaphragm according to a third embodiment of the present invention, showing a composite diaphragm in which a carbon UDPP 1 is bonded to the pulp 4 by using a skin material on the front or both sides of the diaphragm. It is.

As described above, according to the diaphragm for the speaker of the present invention, by using carbon UDPP as the diaphragm body material or as part of the diaphragm body composite material, it is very excellent to have a much higher elastic modulus than conventional diaphragm materials It works.

In addition, according to the method of manufacturing a diaphragm for a speaker of the present invention, the laminated sheet formed by stacking two or more sheets of carbon UDPP may be cut and assembled into a diaphragm shape, or may be formed by adhering on a diaphragm of another material and bonded to obtain the following effects. have.

First, it is possible to increase the high-frequency playback band of the speaker, it is possible to manufacture a speaker with high fidelity. Second, since the stiffness and propagation speed are high, the sound quality with high clarity can be realized. Third, since the thickness and weight of the diaphragm are easily adjusted, material handling is easy. Fourth, the manufacturing process can be easily manufactured because it belongs to the simple side. Fifth, the appearance is unique and beautiful.

The physical property as a diaphragm material compared with other material is shown in the following table.

Diaphragm material Modulus of elasticity (N / m ² × 10 ⁹ ) Inelastic modulus (cm ² / s × 10 ¹⁰ ) Internal loss Pulp Diaphragm 4.0 to 4.5 4.5 to 5.0 0.04 PP system diaphragm 4.5 to 5.0 4.0 to 6.0 0.05 Carbon fiber diaphragm 7.0-25.0 4.6-17.0 0.015 Diaphragm of the present invention 45.0-55.0 34.0 to 42.0 0.015

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to various modifications, changes, additions, etc. within the spirit and scope of the present invention, these modifications and changes should be seen as belonging to the following claims something to do.

Claims (4)

In the diaphragm for a speaker, The diaphragm stacks two or more unit carbon UDPPs formed by drying the carbon fibers adhered and arranged in one direction in a semi-cured state, and the fiber array directions of the stacked unit carbon UDPPs cross each other at right angles or at arbitrary angles. The diaphragm for the speaker, characterized in that formed after cutting radially. In the speaker having a honeycomb structure and a diaphragm having carbon fibers bonded to both surfaces of the core and in close contact with one direction, The carbon fiber is a diaphragm for a speaker, characterized in that the carbon UDPP dried in a semi-cured state after being impregnated in the resin. In the diaphragm manufacturing method for a speaker, Stacking two or more carbon UDPPs so that the fiber arrangement direction is perpendicular or at an arbitrary angle, and cutting the stacked carbon UDPPs; Splitting the laminated carbon carbon UDPP radially and folding it into a predetermined shape; Cutting the core of the honeycomb structure into a predetermined shape; Placing the carbon UDPP on a mold, and placing the core on the carbon UDPP; Method of manufacturing a diaphragm for a speaker, characterized in that for performing the thermoforming by placing the other carbon UDPP on the surface of the core that is not in contact with the carbon UDPP. In the diaphragm manufacturing method for a speaker, Stacking two or more carbon UDPPs such that the fiber arrangement direction is perpendicular or at an arbitrary angle; Assembling the laminated carbon UDPP radially into equal parts to form a predetermined diaphragm; Method of manufacturing a diaphragm for a speaker, characterized in that the surface skin material such as pulp diaphragm, woven fabric, non-woven fabric, etc. on the mold, and the carbon UDPP pieces are placed thereon and thermoformed.

Images