TWI601432B - Composite diaphragm structure and its manufacturing method - Google Patents

Description

Composite diaphragm structure and manufacturing method thereof

The invention relates to a manufacturing method for a loudspeaker diaphragm, in particular to a method for manufacturing a composite diaphragm structure, which utilizes the characteristics that the hot melt adhesive and the thermosetting glue are easily fused to each other, so that the powdery reinforcing material can be tightly closed. Glue and evenly adhere to a diaphragm material.

With the development of smart phones, it has also driven the development of micro-speakers. In order to enable the speaker to output sound with superior acoustic characteristics, a variety of diaphragm materials have been continuously developed. Among them, some speakers use a composite diaphragm design.

The conventional composite diaphragm is prepared by uniformly mixing a reinforcing material such as alumina, cerium oxide or carbon nanotubes to an adhesive (for example, a thermosetting resin such as an epoxy resin), and then applying it to a vibration. The surface of the film raw material is then baked in a hot air oven, and the reinforcing material and the thermosetting resin are solidified on the original material of the diaphragm, and finally cooled and cooled. However, most of this type of reinforcing material is a nano powder belonging to porous particles, and its adhesion to an adhesive is often very poor. Therefore, when the diaphragm made of this type of reinforcing material is subjected to severe vibration or environmental factors, the reinforcing material is easily detached from the diaphragm material, thereby affecting the physical properties of the composite diaphragm and the output sound quality of the speaker.

In view of this, the main object of the present invention is to provide a composite diaphragm structure and The manufacturing method thereof allows the reinforcing material and the adhesive to be sufficiently fused, and is not easily detached from the diaphragm material.

In order to achieve the above object, the present invention provides a composite diaphragm structure manufacturing The method comprises the steps of: (a) mixing a reinforcing material in a powder form with a hot melt adhesive, coating the hot melt adhesive with the reinforcing material to form a first mixture; and (b) forming the first mixture with a heat The solid phase is mixed to form a second mixture; (c) coating the second mixture to a diaphragm material, followed by heating; (d) cooling the second mixture and the diaphragm material to cure the second mixture In the diaphragm material, a composite diaphragm structure is formed.

Thereby, when the second mixture is baked at a high temperature, the heat of the reinforcing material is coated inside. The melt melts and fuses with the thermosetting glue, and the thermosetting adhesive also solidifies with high temperature baking, so that the reinforcing material can be uniformly cured on the diaphragm raw material without being easily peeled off from the diaphragm raw material, and At the same time, the rigidity and strength of the composite diaphragm structure are enhanced, and the acoustic characteristics of the sound outputted by the speaker are optimized.

A composite diaphragm junction can be manufactured by the aforementioned manufacturing method of the present invention. The structure comprises a diaphragm material, and the surface of the diaphragm material is at least partially coated with a mixture of hot melt adhesive, thermosetting glue and powdery reinforcing material, and the predetermined effect of the invention can be achieved.

S1-S4‧‧‧ steps

1 is a flow chart of a method for manufacturing a composite diaphragm according to a preferred embodiment of the present invention.

In order to better understand the features of the present invention, the present invention provides a preferred embodiment and is described below in conjunction with the drawings. Please refer to FIG. The main method for manufacturing the composite diaphragm structure of the present invention The steps are as follows: First, step S1 is performed, a reinforcing material in a powder form is mixed with a hot melt glue in a gel form, and the temperature of the hot melt adhesive is maintained during the mixing process, so that the hot melt adhesive can be uniformly packaged. The strong material is covered to form a first mixture. Wherein the reinforcing material may be selected from the group consisting of alumina, cerium oxide, zirconium oxide, titanium dioxide, calcium phosphate, aluminum hydroxide, zinc oxide, cerium carbide, fullerene, carbon nanotubes and graphene, or a mixture thereof. And it is a nano powder, and the material of the hot melt adhesive can be selected from the group consisting of cellulose ester, vinyl polymer, polyvinyl alcohol, polyvinyl chloride, polyacrylate, poly-α-cyanoacrylate, polyvinyl acetal, Any of polyamine, ethylene acetate copolymer or styrene-butadiene copolymer.

Next, step S2 is performed to uniformly homogenize the first mixture with the gelatinous thermosetting glue. Mixing to form a second mixture. The thermosetting adhesive material may be selected from the group consisting of epoxy resin, phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, organic germanium resin, furan resin, unsaturated polyester, acrylic resin, polyimine, polybenzimidazole, phenolic - any of polyvinyl acetal, phenolic-polyamide, phenolic-epoxy or epoxy-polyamine.

Next, step S3 is performed to uniformly apply the second mixture to a planar shape. In the diaphragm material, in the present embodiment, the second mixture is applied to the surface of the diaphragm raw material by using curtain coating, and since the technique of the curtain coating is not the focus of the present case, it is here. Will not be detailed. The coated diaphragm stock and the second mixture are then transferred to a baking oven for baking. After the baking is completed, step S4 is performed to cool and cool the diaphragm raw material and the second mixture, and then the second mixture is solidified on the surface of the diaphragm raw material to form a composite diaphragm structure.

In the step S3, when the diaphragm raw material and the second mixture are transferred to the baking box for high temperature baking, since the reinforcing material has been previously coated in the hot melt adhesive in step S1, And the hot melt adhesive and the thermosetting adhesive have the same material properties, so when the diaphragm raw material and the second mixture are transferred to the baking box and baked at a high temperature, the hot melt adhesive is first melted and fused with the thermosetting glue. Moreover, the thermosetting glue is also solidified due to the high-temperature baking relationship, so that the reinforcing material can be uniformly solidified on the diaphragm raw material with the thermosetting glue, so that it is not easy to fall off from the diaphragm raw material. After curing, the strength and rigidity of the composite diaphragm structure formed by the diaphragm and the second mixture as a whole can be enhanced, and the acoustic characteristics of the sound outputted by the speaker can be optimized.

Finally, it must be noted that the constituent elements disclosed in the foregoing embodiments of the present invention are merely illustrative and are not intended to limit the scope of the present invention, and other structural changes that are easily conceivable, or alternatives to other equivalent elements. Changes should also be covered by the scope of the patent application for this case.

S1-S4‧‧‧ steps

Claims (6)

A method for manufacturing a composite diaphragm structure, comprising the steps of: (a) mixing a reinforcing material in a powder form with a hot melt adhesive, and coating the reinforcing material with the hot melt adhesive to form a first mixture; b) mixing the first mixture with a thermosetting gum to form a second mixture; (c) coating the second mixture to a diaphragm stock, followed by heating; (d) cooling the second mixture And the diaphragm material, the second mixture is cured and bonded to the diaphragm material. The method for producing a composite diaphragm structure according to claim 1, wherein the reinforcing material is a nano powder. The method for manufacturing a composite diaphragm structure according to claim 2, wherein the reinforcing material is made of alumina, ceria, zirconia, titania, calcium phosphate, aluminum hydroxide, zinc oxide, lanthanum carbide, fullerene, Any one of a carbon nanotube and a graphene, or a mixture selected from the above materials. The method for producing a composite diaphragm structure according to claim 1, wherein in the step (c), the second mixture is applied to the surface of the diaphragm material by a curtain coating method. A composite diaphragm structure comprising a diaphragm material, and the surface of the diaphragm material is at least partially coated with hot melt adhesive, thermosetting glue and powder reinforcement by the method of claim 1 A mixture of materials formed by mixing. The composite diaphragm structure according to claim 5, wherein the reinforcing material is a nano powder.