KR101000701B1 - Manufacturing Method of Double Dome Tympanum for Earphone - Google Patents

Abstract

The present invention relates to a method for manufacturing a double dome diaphragm for earphones having a relatively thin boundary portion for generating a low range and a relatively thick center portion for generating a high range using vacuum molding, and comprising: Positioning the fabric for manufacturing the auxiliary diaphragm in the mold, and then forming the auxiliary diaphragm through vacuum forming; Applying and drying the adhesive on the molded auxiliary diaphragm; Cutting the outer side of the dried auxiliary diaphragm; A molding preparation step of seating the auxiliary diaphragm cut at the center portion of the second mold and placing a fabric for manufacturing the base diaphragm on the auxiliary diaphragm; A double dome diaphragm having a low-pass boundary consisting of a base diaphragm and a high-pass center formed by adhering the auxiliary diaphragm and the base diaphragm to be bonded to each other by heating the second mold to bond the fabric for manufacturing the auxiliary diaphragm and the base diaphragm. Molding; And cutting the outer edge of the molded double dome diaphragm.

Diaphragm, earphone, double dome vibration plate, vacuum forming

Description

Manufacturing Method of Double Dome Tympanum for Earphone

1 is a cross-sectional view showing the structure of a double dome diaphragm produced by the present invention,

2 is a flow chart of the manufacturing method of the double dome diaphragm according to the present invention;

3 is a cross-sectional view for explaining a molding process of the auxiliary diaphragm in the method of manufacturing a double dome diaphragm according to the present invention;

4 is a cross-sectional view illustrating a process of bonding a base diaphragm and an auxiliary diaphragm and forming a base diaphragm in a method of manufacturing a double dome diaphragm according to the present invention.

<Description of Symbols in Drawings>

10: double dome diaphragm 11: base diaphragm

12: auxiliary diaphragm 13: adhesive

14: high-pass center 15: low-pass boundary

16: metal edging

20, 20 ': first mold 21, 21': auxiliary diaphragm forming part

22, 22 ': intake air

30: 2nd metal mold | die 31: High-pass center part shaping part

32: low-pass boundary forming part 33: intake hole

The present invention relates to a method for manufacturing a double dome diaphragm (also referred to as a dual diaphragm) used in earphones, and more particularly, comprising a relatively thin boundary to generate a low range and a relatively thick center to generate a high range. The present invention relates to a method of manufacturing a double dome diaphragm for earphones using vacuum molding.

In order to reproduce the high range, the diaphragm should be thick or hard to prevent damage to the diaphragm due to the high range vibration. However, in order to reproduce the low range, the diaphragm must be thin or soft to prevent the loss of sound pressure by the diaphragm. Thus, in principle, sound generating devices such as speakers and earphones can only reproduce a specific frequency band by means of a diaphragm.

A double dome diaphragm consisting of a relatively thin boundary and a relatively thick center is proposed for reproducing sound in a wide band from high to low frequencies. Damage that may occur to the diaphragm during high range reproduction is prevented by a high intensity central part. The loss of sound pressure is reduced by the thin boundary at low range reproduction.

The double dome diaphragm is manufactured by bonding and forming an auxiliary midplane at the center of the base diaphragm. More specifically, a method of adhering the molded auxiliary diaphragm to the center of the double dome-shaped base diaphragm, or a method of laminating the formed auxiliary diaphragm to the center of the base diaphragm material and simultaneously molding and adhering (for example, registered in Korea) Patent 714501) or the like is used. In this case, molding and bonding are performed by placing the base diaphragm and / or the auxiliary center plate on a lower mold such as a metal material and then pressing the upper mold such as a silicon material.

It is possible to manufacture the double dome diaphragm for the speaker using the upper mold and the lower die. However, when manufacturing the double dome diaphragm for the earphone having a thickness of several μm, the double dome diaphragm for the earphone may be damaged by the pressure caused by the upper mold. The probability of manufacturing double dome diaphragm for earphone using upper mold and lower mold is high. In addition, the production time is long and the productivity is low because each process is performed using the upper and lower two molds.

The present invention has been made to overcome the above-mentioned problems, it is an object of the present invention to provide a method for manufacturing a double dome diaphragm for earphone having a thickness of several μm.

It is also an object of the present invention to provide a method for manufacturing a double dome diaphragm capable of shortening the production time and improving productivity using a small number of molds.

In order to achieve the above object, the present invention, in the manufacturing method of a double-dome diaphragm for earphone having a high-pass center portion thicker than the low-pass border portion and the low-pass border portion, the fabric for manufacturing the auxiliary diaphragm on the first mold After positioning, shaping the auxiliary diaphragm through vacuum forming; Applying and drying the adhesive on the molded auxiliary diaphragm; Cutting the outer side of the dried auxiliary diaphragm; Seating the auxiliary diaphragm cut at the center of the second mold, and positioning the fabric for manufacturing the base diaphragm on the auxiliary diaphragm; The second dome is heated to bond the fabric for manufacturing the auxiliary diaphragm and the base diaphragm, and the vacuum dome is a double dome having a low-pass boundary consisting of the base diaphragm and the high-pass center formed by adhering the auxiliary diaphragm and the base diaphragm. Shaping the diaphragm; And cutting the outer edge of the formed double dome diaphragm.

The forming preparation step may further include positioning a metal rim to correspond to the outer periphery of the double dome diaphragm, and forming the double dome diaphragm may further include adhering the fabric and the metal rim for manufacturing the base diaphragm. Can be.

It is preferable that a 1st metal mold upper surface consists of a curved surface of the form same as that of a 2nd metal mold upper surface, or reversed.

An intake hole communicating with the vacuum pump is provided on the upper surface of the first mold and the second mold, and the intake hole provided in the upper portion of the second mold is formed at a position corresponding to the boundary of the auxiliary diaphragm.

The thickness of the double dome diaphragm may be 5 to 20 μm.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is a cross-sectional view showing the structure of a double dome diaphragm produced by the present invention.

Referring to FIG. 1, the double dome diaphragm 10 for earphones manufactured by the present invention includes a base diaphragm 11 and an auxiliary diaphragm 12 bonded to a lower portion of a center of the base diaphragm 11. The central portion 14 of the double dome diaphragm 10 is formed by joining the base diaphragm 11 and the auxiliary diaphragm 12 to be made relatively thick with a thickness of about 10 to 20 μm, and serves as a diaphragm for a high range. The boundary portion 15 of the double dome diaphragm 10 is composed of only the base diaphragm 11 and is made relatively thin with a thickness of about 5 to 10 μm, and serves as a diaphragm for a low range. The double dome diaphragm 10 is further provided with a metal rim 16 connected to the electromagnet of the earphone to transmit the vibration of the electromagnet to the double dome diaphragm 10. The metal rim 16 can be omitted for production efficiency, defect reduction and cost reduction.

Hereinafter, a method for manufacturing the double dome diaphragm 10 for earphones configured as shown in FIG. 1 will be described with reference to the flowchart of FIG. 2.

Referring to FIG. 2, first, the auxiliary diaphragm 12 is molded by a vacuum molding method using the first molds 20 and 20 '(step S100).

Referring to FIG. 3, a convex auxiliary diaphragm forming part 21 having a shape corresponding to the shape of the auxiliary diaphragm 12 of the earphone double dome diaphragm 10 is formed on an upper surface of the first mold 20. One or more intake holes 22 are formed in the diaphragm forming part 21. The intake hole 22 communicates with a vacuum pump (not shown). The first mold 20 may be connected to a heating device (not shown) and heated.

Alternatively, referring to FIG. 4, a concave auxiliary diaphragm forming portion 21 ′ having a shape inverted to the shape of the auxiliary diaphragm 12 of the double dome diaphragm 10 for earphones is formed on an upper surface of the first mold 20 ′. One or more intake holes 22 'are formed in the auxiliary diaphragm forming portion 21'. The intake hole 22 'is in communication with a vacuum pump (not shown). At least one of the intake holes 22 'is preferably located at the lowest portion of the concave auxiliary diaphragm forming portion 21' so that the auxiliary diaphragm 12 is easily formed. The first mold 20 'may be connected to a heating device (not shown) and heated.

The fabric for forming the auxiliary diaphragm 12 is located on the first mold 20, 20 ′. The fabric has a thickness of 5 to 10 μm. While the first molds 20 and 20 'are heated, the vacuum pump connected to the intake holes 22 and 22' intakes and the auxiliary diaphragm 12 is shape | molded by the vacuum molding method. By heating, the original fabric is melted and brought into close contact with the first molds 20 and 20 '. When intake through the intake holes 22 and 22 'occurs, voids that may occur between the fabric and the first mold 20 and 20' are removed, and the fabric is removed from the first mold 20 by the atmospheric pressure applied on the fabric. 20 '). When the first molds 20 and 20 'are cooled, the auxiliary diaphragm 12 is cured and the auxiliary diaphragm 12 is formed in the shape of the upper surface of the first molds 20 and 20'. The molded auxiliary diaphragm 12 has a thickness of 5 to 10 μm. By using such a vacuum forming method, a thin diaphragm having a thickness of 5 to 10 μm can be produced without damage. In addition, the mold for pressurizing from the upper side is unnecessary, the molding time is reduced, and the productivity is improved.

The adhesive 13 is applied and dried on the molded auxiliary diaphragm 12 (step S200). The adhesive 13 uses a thermal adhesive which is fused by heat.

The outer periphery of the auxiliary diaphragm 12 to which the adhesive is applied is cut (step S300). The cut auxiliary diaphragm is aligned for the next step.

The auxiliary diaphragm 12 cut on the high-pass center part forming part 31 located in the center of the upper surface of the second mold 30 is seated, and the metal frame 16 is seated on the outermost surface of the second mold 30. And, the fabric for manufacturing the base diaphragm 11 is located thereon (S400 step). The fabric for manufacturing the base diaphragm 11 has a thickness of 5 to 10 μm.

Referring to FIG. 5, a high-pass center part forming part 31 for forming a high-pass center part of the double dome diaphragm 10 is formed at the center of the upper surface of the second mold 30, and the double-dome diaphragm 10 is formed at the upper boundary. The low-pass boundary forming part 32 for forming the low-pass boundary of the is formed. The high-pass center part forming part 31 of the 2nd metal mold | die 30 has the curved surface of the same form as the upper surface of the 1st metal mold | die 20. FIG. At least one intake hole 33 communicating with a vacuum pump (not shown) is formed at the boundary between the high-frequency central forming portion 31 and the low-frequency boundary forming portion 32. The second mold 30 may be connected to a heating device (not shown) and heated.

When the fabric for manufacturing the auxiliary diaphragm 12, the metal frame 16, and the base diaphragm 11 is positioned, the second mold 30 is heated and at the same time a vacuum pump connected to the intake hole 33 intakes and vacuums. The double dome diaphragm 10 is molded by the molding method (S500 step).

By heating, the fabric for producing the base diaphragm 11, the auxiliary diaphragm 12, and the adhesive 13 applied on the auxiliary diaphragm 12 are melted so that they are in close contact with the second mold 30. do.

When intake through the intake hole 33 occurs, the void and auxiliary diaphragm 12 and the base diaphragm 11 that may occur between the second mold 30 and the auxiliary diaphragm 12 on the high-pass center portion 31. The voids that may occur between the fabrics for fabrication) are removed, and the fabrics for fabricating the auxiliary diaphragm 12 and the base diaphragm 11 are applied by the atmospheric pressure applied onto the fabric for fabricating the base diaphragm 11. It adheres on the high-pass center part shaping part 31. The original fabric for manufacturing the close auxiliary diaphragm 12 and the base diaphragm 11 is bonded by an adhesive 13 that is fused by heat.

In addition, when intake through the intake hole 33 occurs, the voids that may occur between the fabric for manufacturing the second mold 30 and the base diaphragm 11 on the low-pass boundary forming part 32 are removed, The raw fabric for manufacturing the base diaphragm 11 is brought into close contact with the low-frequency boundary forming portion 32 by the atmospheric pressure applied onto the raw fabric for manufacturing the base diaphragm 11. [

In addition, the fabric for manufacturing the base diaphragm 11 is melted and bonded to the metal rim 16.

When the second mold 30 is cooled, the base diaphragm 11 and the auxiliary diaphragm 12 are cured to form the double dome diaphragm 10. The base diaphragm 11 and the auxiliary diaphragm 12 are adhere | attached and shape | molded by the adhesive agent 13 on the high-pass center part shaping part 31, and the high-pass center part 14 of the double dome diaphragm 10 is formed. The high band central portion 14 has a base diaphragm 11 and an auxiliary diaphragm 12 laminated to have a thickness of 10 to 20 μm. The base diaphragm 11 is molded on the low-pass boundary forming part 32 to form the low-pass boundary 15 of the double dome diaphragm 10. The low pass boundary portion 15 is composed of only the base diaphragm 11 and has a thickness of 5 to 10 μm. The outer edge of the low-pass boundary 15, the metal frame 16 is integrally connected.

Using this vacuum forming method, a thin diaphragm of 10 to 20 μm in thickness can be produced without damage. In addition, when forming using the upper and lower molds can not be molded at the same time the metal frame 16, but in the case of vacuum forming using only the lower mold according to the present invention can be formed at the same time including the metal frame (16). have. In addition, the mold for pressurizing from the upper side is unnecessary, the molding time is reduced, and the productivity is improved.

On the other hand, it is described that the metal diaphragm 16 is seated on the second mold 30 in step S400, and the metal diaphragm 16 is integrally formed in the step S500, but in order to increase production efficiency, reduce defects, and reduce costs. It is also possible to proceed to steps S400 and S500 without the metal diaphragm 16.

The outer edge of the double dome diaphragm 10 is completed is cut and the double dome diaphragm 10 is completed (step S600).

According to the present invention, a double dome diaphragm for an earphone having a relatively thick center portion for a high frequency and a relatively thin boundary portion for a low frequency and having a thickness of 5 to 20 μm can be manufactured without damage.

In addition, according to the present invention, a small number of molds of the first mold and the second mold are used. In addition, it is possible to shorten the production time and improve the productivity by using the vacuum molding method.

In addition, according to the present invention it can be molded to include a metal rim during the vacuum forming process.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be readily apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, and all such changes and modifications are It is obvious that it belongs to the scope of the appended claims.

Claims (6)

In the manufacturing method of a double-dome diaphragm for earphones having a low-pass border and a high-pass center portion thicker than the low-pass border, Placing the fabric for manufacturing the auxiliary diaphragm on a first mold, and then forming the auxiliary diaphragm through vacuum forming; Applying and drying an adhesive on the molded auxiliary diaphragm; Cutting the outer periphery of the dried auxiliary diaphragm; A molding preparation step of seating the cut auxiliary diaphragm at a central portion of a second mold and placing a fabric for manufacturing a base diaphragm on the auxiliary diaphragm; The second mold is heated to bond the fabric for manufacturing the auxiliary diaphragm and the base diaphragm, and the low band boundary portion formed of the base diaphragm and the auxiliary diaphragm and the base diaphragm are bonded by vacuum forming. Molding the double dome diaphragm having a center portion; And And cutting the outer edge of the molded double dome diaphragm. The method of claim 1, The forming preparation step further includes the step of positioning the metal rim to correspond to the outside of the double dome diaphragm, Forming the double dome diaphragm further comprises the step of adhering the fabric and the metal frame for manufacturing the base diaphragm diaphragm diaphragm manufacturing method for the earphone. The method of claim 1, The first mold upper surface is a double dome diaphragm manufacturing method for the earphone, characterized in that the curved surface of the same shape as the upper surface of the second mold center portion or inverted shape. The method of claim 1, The first mold and the second mold upper surface is provided with an intake hole communicating with the vacuum pump, characterized in that the earphone double dome diaphragm manufacturing method. The method of claim 4, wherein The intake hole provided in the upper portion of the second mold is formed in a position corresponding to the boundary of the auxiliary diaphragm diaphragm diaphragm manufacturing method for the earphone. The method of claim 1, Double dome diaphragm manufacturing method for the earphone, characterized in that the thickness of 5 to 20 ㎛.

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