TW201545564A - Loudspeaker vibration membrane and electric discharge treatment molding method thereof - Google Patents

Abstract

The present invention provides a loudspeaker vibration membrane and the electric discharge treatment molding method thereof. The method comprises the following steps: (a) to provide a fiber fabric material; (b) to immerse the fiber fabric material in a liquid resin and bake it; (c) to perform a hot-pressing forming process to the fiber fabric material. In a dry state before or after forming the loudspeaker vibration membrane, which includes one or more steps before or after immersing the fiber fabric material in the resin, after mounting an adhesive layer and forming the loudspeaker vibration membrane, the surface of the membrane is treated with electric discharge treatment for one or more times to increase its surface roughness and surface energy, thereby increasing the adhesion strength between the loudspeaker vibration membrane and loudspeaker components during their adhering process.

Description

Horn vibrating piece and discharge processing molding method thereof

The present invention relates to a horn part and a process thereof, and more particularly to a horn vibrating piece and a discharge processing molding method thereof.

Different kinds of speakers can be seen everywhere in daily life, which is mainly an electroacoustic transducer that converts electrical energy into sound energy through some physical effect. Speakers for different applications can be divided into many different types, such as piezoelectric speakers, electromagnetic speakers, capacitive speakers, electric speakers, and the like. For various speakers used in car speakers, outdoor electronic devices, handheld electronic devices (mobile phones, tablet computers), there are various needs in various application fields, including moisture resistance (water repellency), heat resistance, Flame-retardant/flame retardant, etc., to avoid the speaker in these electronic devices or equipment, because physical factors such as humidity, temperature and the like cause malfunction of the horn parts, and even cause dangerous factors that may occur.

Referring to the first and second figures, respectively, a side view of the structure inside the conventional technical horn and a perspective view of a conventional vibrating piece are shown. The internal structure of the horn includes a housing 30, a core 31, a voice coil 32, and a horn vibrating piece 33 (for example, a spring wave). The magnet core 31 is disposed in the outer casing 30, and the outer surface of the voice coil 32 is wound with a coil to connect an external power source, and is connected to the magnet core 31. When an electric current passes, electromagnetic induction is generated to vibrate up and down, and the horn vibrating piece 33 is connected to the outer casing 30, and With a central through hole 34 for connecting the voice coil 32, the horn vibrating piece 33 must have a light weight, a certain hardness and elasticity to fix the voice coil 32, vibrate with the voice coil 32 and provide a damping buffer.

Taking the elastic wave shown in the second figure as an example, the material of the horn vibrating piece of the prior art is usually a cloth impregnated with a resin, usually a circular body, and the cross section is formed into a wave-like shape by heat embossing. The manufacturing method of the conventional vibrating piece generally has a resin impregnation step, a baking step, an imprint step, and a forming and cutting step. The resin impregnation step impregnates the fabric with the resin, so that the cloth absorbs the resin and has a certain hardness. The baking step dries the resin-absorbent fabric to remove moisture from the fabric. The embossing step heats the resin-absorbent cloth to form a desired shape in a cross-section by imprinting, for example, a wave shape. The forming and cutting step is cut into a plurality of horn vibrating pieces, and the excess cloth is removed to further form a central through hole. However, in the conventional field of manufacturing, for example, a car horn vibrating piece, conventionally, the requirements for moisture resistance (water repellency), heat resistance, flame retardancy/flame retardancy, and the like are not high, and those skilled in the art have not attempted to The technical application of molecular materials is in the improvement of the horn vibrating piece, for example, the surface thereof is pretreated to enhance the surface property modification. In the case of polymer materials, surface properties of some special materials, such as chemical composition, hydrophilicity, roughness, electrical conductivity, crosslink density, etc., are often the focus of consideration. These special properties can be exploited by surface modification techniques. The polymer material is treated to make the surface of the polymer material conform to the desired surface properties.

However, in today's automotive industry, electronic equipment parts standards are getting higher and higher, the physical environment tolerance performance of the speaker parts is increasingly demanding, this combination of high-tech to give the speaker vibrating plate specific performance research There is indeed a need for its development.

Accordingly, an object of the present invention is to provide a discharge processing molding method for a horn vibrating piece, the steps comprising: (a) providing a fiber cloth; (b) impregnating the fiber cloth with a liquid resin and drying; (c) providing a layer of glue on the surface of the fiber cloth and drying; (d) the fiber The cloth material is subjected to hot press forming to form at least one disc-shaped horn vibrating piece; wherein any dry state before or after the horn vibrating piece is formed, including before or after the fiber cloth impregnating resin step, is set In any one or more steps after the glue layer and after forming the horn vibrating piece, the surface is subjected to one or more discharge treatments to improve the surface roughness and surface energy.

Preferably, the discharge treatment is performed on an annular position of the horn vibrating piece adjacent to the outer edge, and the discharge treatment is performed on an annular position of the horn vibrating piece adjacent to the inner inner edge.

Preferably, the method further comprises immersing the fiber cloth material with a functional auxiliary agent after performing the electric discharge treatment, the functional auxiliary agent comprising a water repellent agent and a flame retardant.

Preferably, the discharge treatment comprises a plasma discharge treatment and a corona discharge treatment.

Preferably, the above method further comprises cutting the fiber cloth into a plurality of horn vibrating pieces after hot press forming.

Another object of the present invention is to provide a horn vibrating piece formed by the above molding method, wherein the horn vibrating piece comprises a cloth body which is disc-like and is woven by a plurality of warp yarns and weft yarns. The surface of the cloth body is combined with a resin layer and a rubber layer, and the surface of the cloth body is subjected to electrical discharge treatment to form a rough polar surface on the surface.

Preferably, the surface of the cloth body is subjected to a discharge treatment adjacent to an annular position at the inner inner edge to form a first rough polarity region; or an electric discharge treatment is performed at an annular position adjacent to the outer edge of the cloth body surface to form A second rough polarity zone.

Preferably, the rough surface of the surface of the cloth body is further combined with a resistance layer, The tolerant layer is a water layer or a flame retardant layer.

Through the technical means of the present invention, the horn vibrating piece after the discharge treatment can increase the bonding strength between the adhesive and the horn vibrating piece and its subsequent target position due to the improvement of the surface roughness and the surface energy. It can effectively increase the combination of water repellent, flame retardant and horn vibrating piece, improve the water repellency, flame retardant/flame retardant of horn vibrating piece, in order to meet the requirements or standards of car horn parts and internal parts of electronic devices.

100‧‧‧Fiber cloth

1‧‧‧Liquid resin

11‧‧‧ warp yarn

12‧‧‧ Weft

200‧‧‧ horn vibrating piece

20‧‧‧ cloth body

201‧‧‧ first surface

202‧‧‧ second surface

21‧‧‧ warp yarn

22‧‧‧ Weft

23‧‧‧ resin layer

231, 232‧‧‧ rough polar faces

233‧‧‧First rough polar zone

234‧‧‧Second rough polar zone

24‧‧‧ glue layer

25‧‧‧Resistant layer

30‧‧‧Shell

31‧‧‧Magnetic heart

32‧‧‧ voice coil

33‧‧‧ horn vibrating piece

34‧‧‧Center through hole

4‧‧‧Binder

S1~S6‧‧‧Steps

Θ‧‧‧contact angle

The first figure shows a cross-sectional view of the internal structure of a conventional technical horn.

The second figure shows a perspective view of a conventional horn vibrating piece (elastic wave).

The third figure shows a block diagram of the manufacturing process of the horn vibrating piece of the present invention.

The fourth figure shows a schematic diagram of the manufacturing process of the horn vibrating piece of the present invention.

The fifth figure shows a partial schematic view of the fiber cloth.

The sixth and sixth B diagrams respectively show the surface tension of the horn vibrating piece before and after the discharge treatment.

Figures 7A and 7B respectively show different cross-sectional views of the horn vibrating piece.

Figs. 8A and 8B respectively show the horn vibrating piece after partial discharge treatment and its subsequent position with the horn part.

Please refer to the third and fourth figures, which respectively show the manufacturing flow block diagram and schematic diagram of the horn vibrating piece. As shown in the figure, a fiber cloth is first provided (step S1). Referring to the fifth drawing, which shows a partial schematic view of the fiber cloth 100, the fiber cloth 100 is mainly composed of a warp yarn 11 and a weft yarn 12, and the fiber component used for the warp yarn 11 and the weft yarn 12 may be agglomerated. Ester fiber, cotton fiber, acrylic fiber, silk fiber, polyethylene naphthalate (PEN), benzomethine fiber (Aramid), bamboo fiber, etc., but not limited thereto.

Here, the surface of the fiber cloth 100 can be selectively subjected to discharge treatment (step S6) to increase the surface energy (surface tension) of the surface of the fiber cloth. The above discharge treatment may be a plasma discharge treatment or a corona discharge treatment.

The plasma treatment system can have different functional groups on the surface according to different gas plasmas (such as argon, oxygen, nitrogen and fluorine-containing gases). For example, oxygen plasma treatment can improve the surface energy of the fiber cloth. Conversely, a fluorine-containing gas plasma can reduce the surface energy of the fiber cloth and can be applied as appropriate. Alternatively, the fiber web can be crosslinked by passing an inert gas plasma such as argon.

Similarly, Corona is also an "shock" treatment that provides a higher adhesion to the surface of the fiber cloth. Corona is produced by using high-voltage and high-frequency waves to generate electric shocks for grounding and induced air nozzles. No current flows between them until the voltage is as high as 9000~/5000 volts/cm2. After that, the electric shock molecules are ejected from the air nozzle, and the high-energy free electrons are accelerated to the positive electrode. Corona corona treatment is the action produced by this dense and high-energy ejecting ions. These ions then destroy the molecular structure by electric shock and penetration into the surface of the fiber cloth, thereby oxidizing and polarizing the surface molecules to be treated, and eroding the surface by ion shock so as to increase the adhesion of the surface of the fiber cloth.

Referring to the sixth A diagram and the sixth B diagram, respectively, the surface tension diagrams of the horn vibrating piece before and after the discharge treatment are shown. As shown, when the droplets are on a solid surface, a film or liquid bead is formed, which represents the affinity of the liquid to the solid, and can also be called Wetting behavior. When the degree of wetting of the liquid on the solid surface is the surface tension between the liquid and the solid, the surface energy and the contact angle, wherein the surface tension unit is made of N/m = kg / sec ² = J / m ² ; CGS The system is dynes / cm = g / sec ² = ergs (ears) / cm ² .

Contact Angle (θ) and Surface Energy are indicators for measuring the affinity and hydrophobicity of the material itself. The contact angle (θ) refers to the angle between the solid surface and the liquid surface. The theoretical test value of the contact angle is 0 to 180 degrees. When θ < 0 degrees, the surface is completely wet. When θ > 180 degrees, the surface is not completely wet. When θ = 1, the liquid/solid attraction is greater than the attraction between the liquids. The size of the contact angle is related to the hydrophobicity of the surface. The greater the contact angle between the substance and the water droplet, the higher the hydrophobicity; the smaller the contact angle of the substance with the water droplet, the higher the hydrophilicity. When the surface energy is larger, the liquid (droplet) ability of the surface energy can be adsorbed, and the liquid adsorption area is larger, resulting in a smaller surface contact angle.

The contact angle and surface energy can inhibit the hydrophilic or hydrophobic ability of the material. As shown in Figure 6A, the contact angle before discharge treatment is large (low surface tension / low surface energy), while the sixth B map passes. After the discharge treatment, the fiber surface is modified to have a larger contact angle (high surface tension / high surface energy), and in the case of a horn vibrating piece, the surface energy is preferably between 20-60 dynes and the contact angle. The system is between 0-90 degrees, which can effectively enhance the combination of the surface of the fiber cloth with the resin, the layer material or other functional additives.

Next, the fiber cloth is impregnated with the liquid resin (step S2), the fiber cloth is absorbing the resin to have a certain hardness, and then the fiber cloth impregnated with the resin is dried. The resin material may be selected from one or a combination of a phenol resin, an epoxy resin, a polyester resin, or other polymer resin materials having thermosetting properties, and is not limited thereto. In the dry state, the surface of the fiber cloth can be selectively subjected to discharge treatment (step S6), the manner and principle of which are the same as above, and the description thereof will not be repeated here.

Providing a glue layer on the fiber cloth (step S3), which can be applied by screen printing or other means, and the glue layer material can be rubber, silicone or other polymer glue material, and then The fiber cloth material after coating the rubber layer material is dried. In the dry state, the surface of the fiber cloth can be selectively subjected to discharge treatment (step S6), the manner and principle of which are the same as above, and the description thereof will not be repeated here.

The stamping is heated at a temperature of 200 to 230 degrees (step S4). So far, a plurality of uncut horn vibrating pieces 200 have been formed on the entire cloth. The warp yarn 21, the weft yarn 22, and the thermosetting resin layer 23 and the rubber layer 24 of the horn vibrating piece 200 have been completely molded into a unitary structure (e.g., Fig. 8A).

Then, the formed fiber cloth material can be cut (step S5), or a central through hole (not shown) can be formed for each horn vibrating piece in this step, and the excess fabric is cut to obtain the final horn vibration. sheet. After the finished product is completed, the surface of the fiber cloth can be selectively subjected to discharge treatment (step S6), the manner and principle of which are the same as described above, and the description thereof will not be repeated here.

The horn vibrating piece process of the embodiment may be subjected to one or several discharge treatments, and the discharge treatment step may be set in any dry state before or after the horn vibrating piece is formed, including before or after the fiber cloth impregnating resin step, In any one or more steps after the glue layer and after forming the horn vibrating piece, the surface is subjected to one or more discharge treatments to improve the surface roughness and surface energy. The advantage of multiple discharge treatment is that the chemical additives and polymer resin materials to be added for different steps can be used to help the fiber cloth to adsorb the materials, which is more than the initial discharge treatment. The effect of the secondary discharge treatment is better, but it is more time consuming and costly.

The purpose and advantages of discharge treatment are numerous, and the most important application in this is to help The horn vibrating piece is engaged with other horn parts. As shown in Figures 7A and 7B, the horn vibrating piece after the partial discharge treatment and its subsequent position with the horn member are respectively shown. The horn vibrating piece after the discharge treatment is increased in surface roughness and surface energy, including integral discharge treatment or partial discharge treatment for the subsequent critical position to increase the adhesive 4 and the horn vibrating piece 200 and its subsequent mark The strength between the two. The partial discharge treatment can be achieved by providing a mask or other means, or a plurality of times or a higher intensity discharge treatment can be applied to the region where the discharge treatment is to be performed, and the same purpose can be achieved.

For example, as shown in FIG. 7A, the discharge treatment is performed on the surface of the cloth body adjacent to the center inner edge at the annular position in the above manner to form a first rough polarity region 233, or a ring adjacent to the outer edge of the cloth body surface. The position is subjected to a discharge treatment to form a second rough polarity region 234, either alternatively or simultaneously. These two positions are respectively the inner edge of the center hole of the horn vibrating piece and the punctual point of the voice coil, and the urging point of the outer edge of the horn vibrating piece and the iron frame, mainly the horn vibrating piece is the most important when vibrating with the voice coil. The key force position is also the part that is most prone to cracking, fatigue, looseness, and deformation. Therefore, the adhesion strength with the two positions is increased by the discharge treatment, which is a creative concept that has never been mentioned in the technical field. .

In addition, the inventors have confirmed the results of many experiments, the discharge treatment is also better for resin adsorption, adhesive layer materials or other functional additives, so it can adjust the discharge treatment in the overall process according to different needs and purposes. The order and number of times.

For example, when the horn vibrating piece needs to further add functional additives (such as water repellent, flame retardant, etc.) to increase its water repellency, flame retardancy/flame retardancy, etc., before adding functional additives. The discharge treatment can effectively increase the combination of the water-repellent agent, the flame retardant and the horn vibrating piece, and improve the water repellency, flame retardancy/flame retardancy of the horn vibrating piece to conform to the car horn parts and electronic devices. Requirements or standards for internal parts.

Referring to Figure 8A, there is shown a cross-sectional view of the horn vibrating piece. As shown in the figure, the horn vibrating piece 200 manufactured through the above process includes a cloth body 20 which is woven by a plurality of warp yarns 21 and weft yarns 22 (refer to FIG. 5), and the cloth body 20 has a first The surface 201 and the second surface 202, the first surface 201 and the second surface 202 of the cloth body 20 are combined with a resin layer 23 and a glue layer 24. Since the fiber composition of the cloth body 20 is a polymer material, the surface thereof is originally a non-polar functional group, the surface energy is low, and the hydrophobicity is high, and the surface (the first surface 201 and/or the second surface 202) is subjected to discharge treatment. Roughening the surface (the first surface 201 and/or the second surface 202) and forming a rough polar surface 231, 232, respectively, which, in addition to the increase in surface roughness, can cause a large amount of polar groups on the surface after discharge treatment. The rough polar faces 231, 232 are more easily combined with a resin, a glue layer material, a functional auxiliary, an adhesive, etc., in order to achieve the purpose of helping the material to adsorb or increase the subsequent effect.

Referring to Figure 8B, a cross-sectional view of the horn vibrating piece is shown. As shown in the figure, similarly to FIG. A, in order to make the horn vibrating piece 200 resistant to physical/environmental factors under specific conditions, it is also possible to further soak the functional auxiliaries after the resin impregnation and the adhesive layer are disposed (water immersion a lubricant, a flame retardant, etc., to form a tolerant layer 25 (which may be a water-repellent layer or a flame-retardant layer) on the surface of the horn vibrating piece 200, so that the horn vibrating piece 200 can resist physical/environmental factors under specific conditions, thereby avoiding Damage to the horn parts caused by these factors. In particular, since the fiber cloth which has been subjected to the discharge treatment has an increased surface roughness and a large number of polar groups, it can also assist in the adsorption of functional additives and increase the water-repellent/flammable effect. In the horn vibrating piece 200 shown in the figure, the step of immersing the functional additive is after the step of immersing the liquid resin, but the functional additive may be added to the liquid resin at the same time. As far as the effect is concerned, the effect of separate processing is slightly better, but due to the complexity of the process, the characteristics and cost of the visible horn vibrating piece products are considered, and it is more appropriate to consider which method to use. This is merely an illustration and is not limited to this.

It can be seen from the above embodiments that the horn vibrating piece and the electric discharge processing molding method thereof provided by the present invention have industrial use value, but the above description is only a description of the preferred embodiment of the present invention. Other modifications may be made by the above description, but such modifications are still within the spirit of the invention and the scope of the invention as defined below.

S1~S6‧‧‧Steps

Claims (10)

A discharge processing molding method for a horn vibrating piece, the steps comprising: (a) providing a fiber cloth; (b) impregnating the fiber cloth with a liquid resin and drying; (c) setting the surface of the fiber cloth a layer of glue and drying; (d) hot pressing the fiber cloth to form at least one disk-shaped horn vibrating piece; wherein any dry state before or after the horn vibrating piece is formed, The fiber cloth is subjected to one or more discharge treatments before or after the resin impregnation step, after the adhesive layer is disposed, and after the horn vibrating piece is formed, to improve the surface roughness and surface thereof. can. The method of claim 1, wherein the discharge treatment is performed for an annular position of the horn vibrating piece adjacent the outer edge. The method of claim 1, wherein the discharge treatment is performed for an annular position of the horn vibrating piece adjacent to a central inner edge. The method of claim 1, further comprising immersing the fiber cloth in a functional auxiliary after performing the electric discharge treatment, the functional auxiliary comprising a water repellent and a flame retardant. The method of claim 1, wherein the discharge treatment comprises a plasma discharge treatment and a corona discharge treatment. The method of claim 1, further comprising cutting the fiber cloth into a plurality of horn vibrating pieces after hot press forming. A horn vibrating piece is formed by the molding method according to claim 1, wherein the horn vibrating piece comprises a cloth body which is disc-like and is composed of a plurality of warp yarns and weft The yarn is woven, and the surface of the cloth body is combined with a resin layer and a rubber layer, and the surface of the cloth body is subjected to a discharge treatment to form a rough polar surface on the surface. The horn vibrating piece according to claim 7, wherein the surface of the cloth body is subjected to a discharge treatment at an annular position near the center inner edge to form a first rough polarity region. The horn vibrating piece according to claim 7, wherein the surface of the cloth body is subjected to a discharge treatment at an annular position adjacent to the outer edge to form a second rough polarity region. The horn vibrating piece according to claim 7, wherein the rough surface of the cloth body surface is further combined with a resistance layer which is a water-repellent layer or a flame-retardant layer.