KR101676850B1 - Damper for a speaker having an excellent durability and the manufacturing process thereof - Google Patents
Damper for a speaker having an excellent durability and the manufacturing process thereof Download PDFInfo
- Publication number
- KR101676850B1 KR101676850B1 KR1020150057263A KR20150057263A KR101676850B1 KR 101676850 B1 KR101676850 B1 KR 101676850B1 KR 1020150057263 A KR1020150057263 A KR 1020150057263A KR 20150057263 A KR20150057263 A KR 20150057263A KR 101676850 B1 KR101676850 B1 KR 101676850B1
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- South Korea
- Prior art keywords
- damper
- present
- speaker
- polyurethane resin
- resin
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/041—Centering
- H04R9/043—Inner suspension or damper, e.g. spider
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/16—Mounting or tensioning of diaphragms or cones
- H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
Abstract
The present invention relates to a speaker damper having excellent moldability and shape stability without using a harmful phenol resin, and excellent in durability and environmental friendliness that does not cause dropout or cracking of a used resin even at a large amplitude of bass, and a manufacturing method thereof The speaker dampers having excellent durability of the present invention are prepared by mixing a polyurethane resin, a curing agent, toluene and dimethylformamide (DMF) at a predetermined ratio to prepare a dilution liquid and adding a silicone oil thereto To obtain a mixed solution, impregnating the mixed solution with fibers, drying it, and shaping it in the form of a damper, thereby imparting shape stability.
The dampers for speakers having excellent durability and the method of manufacturing the same having the above-described structure according to the present invention are excellent in moldability and shape stability, while using a curing resin in which a curing agent and a diluent are added to a polyurethane having specific physical properties, The present invention also provides an eco-friendly invention for solving the problem of the above-described conventional damper by providing the durability of such a degree that the resin does not come off or crack even with a large amplitude of bass. The damper can be applied to various sound devices.
Description
The present invention relates to a speaker damper having excellent durability and a method of manufacturing the same. More specifically, the present invention relates to a speaker damper having excellent durability and a manufacturing method thereof. More specifically, the present invention relates to a speaker damper having excellent moldability and shape stability, The present invention relates to a damper for a speaker which is environment-friendly and excellent in durability, and a method of manufacturing the same.
In general, a speaker converts electrical energy into mechanical energy by a voice coil existing between the gaps by the Fleming's left-hand rule that a current flows through a magnetic field in the case where the conductor is in a magnetic field, And generates sound waves in the air to radiate sound waves. That is, when a current signal including a plurality of frequencies is applied to the voice coil, the voice coil generates mechanical energy according to the magnitude of the current and frequency, and the diaphragm or cone paper attached to the voice coil shakes, Thereby generating a sound pressure that can be generated.
The magnetic circuit of such a speaker uses a magnet and an upper plate in a yoke made of ferrous metal and forms an inner bobbin 1 inside the
The speaker thus configured is provided with an input signal to the voice coil in a state in which the magnetic flux is perpendicularly coupled to the voice coil existing in the cavity using a magnetic circuit generated between the lower plate made of ferrous metal and the magnet and the upper plate As the voice coil moves up and down, the diaphragm or cone paper restrained in the frame is vibrated to generate a negative pressure.
As described above, the damper used to support the bobbin itself in the structure of the speaker and prevent the diaphragm from flowing to the left and right is generally made of woven fabric using fibers, pretreated with phenol resin In particular, in the conventional manufacturing method, the impregnation (impregnation) of the fiber into the dilution liquid in which phenol resin and methanol are mixed at a certain ratio is carried out, Treated at a temperature of 70 to 90 DEG C for 10 to 20 minutes through a dryer, molded by pressing with a die, and cut to form an inner diameter and an outer diameter.
However, in the conventional general speaker, when the voice coil is moved up and down to generate a negative pressure by vibrating the diaphragm or the cone paper through the voice coil, the flexible lead wire is swung up and down together by the up and down movement of the voice coil, A sufficient vibration amplitude can not be controlled when the upper and lower vibration widths of the bass sound are high. As a result, a normal sound is not generated due to such contact, and the user is discomforted. In addition, in severe cases, there has been a problem of deteriorating the sound quality of a speaker. In addition, when the amplitude is increased by impregnation and molding with a conventional hard phenol resin, the resin is detached or cracked, which causes a serious problem in terms of durability.
For example, Korean Patent Application No. 2006-0132536 discloses a damper structure in which a plurality of dampers are arranged on an imaginary circle corresponding to an outer periphery of a damper to be formed, (B) a step of fixing one end of the fiber to the first support shaft of the support shaft and fixing the end of the fiber to the first support shaft of the support shaft , Fixing the fiber to the second support shaft of the support shaft so that the fiber is in contact with the outer surface of one side of the support tube, fixing the fiber to the third support shaft of the support shaft adjacent to the second support shaft The other side of the fiber is fixed to a fourth support shaft of the support shaft adjacent to the first support shaft so that the fiber is in contact with the other outer surface of the support tube, The fibers between the first support shaft and the second support shaft and the fibers between the third support shaft and the fourth support shaft are separated from each other by the bisector of the first support shaft and the fourth support shaft, (C) repeating the process of step (B) until one end and the other end of the fiber are fixed to all the support shafts; (D) And a step of shaping the fibers formed into a predetermined shape into a desired shape with a binder by a process of step (C) is performed, "discloses a method for manufacturing a damper for a speaker, and Korean Patent Application No. 2009-0074050 Quot; has a trumpet-shaped frame, a permanent magnet fixedly disposed at the lower portion of the frame, and a bottom plate fixedly formed at the center of the permanent magnet, A vibrating plate installed inside the frame and vibrating in a space formed between the permanent magnet and the bottom plate and fixed to the center of the lower end of the vibrating plate and having a voice coil wound thereon A post which is fixedly installed at a center of an upper surface of the bottom plate so as to provide an elastic restoring force to the diaphragm and the bobbin side in a speaker including a bobbin, And a leaf spring fixed to the inner circumferential surface of the bobbin to provide a predetermined elastic restoring force to the bobbin and the diaphragm coupled to the bobbin. Wherein the leaf spring of the damper is formed in a disc shape having the same diameter as the inner circumferential surface of the bobbin and the body is formed such that a plurality of arc-shaped elastic holes are concentrically formed in the arc- Korean Patent Laid-Open Publication No. 2009-0101621 discloses "frame; A magnetic circuit unit coupled to the frame and generating a magnetic force; A voice coil which vibrates when the power is applied, the voice coil having an outer peripheral side coupled to the frame and an inner peripheral side coupled to the voice coil to reproduce sound while being vibrated by the voice coil, the outer peripheral side being coupled to the frame Wherein the damper is formed by laminating at least two sheets of cotton cloth impregnated with a thermosetting resin with an adhesive to form a laminated body, Quot; speaker "
However, in the above-mentioned conventional inventions, improvement of the sound quality and durability is improved by improving the structural form of the damper, but there is still a problem that the improvement effect is not satisfactory along with an increase in cost due to the structural change.
Therefore, the inventors of the present invention have made intensive studies in order to improve the problem of the above-described damper from the viewpoint of the material aspect, not the structural aspect, thereby completing the present invention.
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned technical problems in the prior art, and it is a main object of the present invention to solve the above-mentioned conventional technical problems, And is excellent in shape stability and is also environment-friendly and excellent in durability without causing dropout or cracking of a resin used even at a large amplitude of bass.
Another object of the present invention is to provide a method of manufacturing a speaker damper having excellent durability.
The present invention may also be directed to accomplish these and other objects, which can be easily derived by those skilled in the art from the overall description of the present specification, in addition to the above-mentioned and obvious objects.
It is an object of the present invention to overcome the above-mentioned problems, and as a result, it has been found that phenol resins are replaced with specific types of curable resins, and curing agents and diluents are added in a certain ratio to improve moldability and form stability of the resin It is possible to solve the above-mentioned conventional problems.
According to an aspect of the present invention, there is provided a damper for speaker having excellent durability;
A diluent is prepared by mixing a polyurethane resin, a hardener, toluene and dimethylformamide (DMF) at a predetermined ratio to prepare a mixed solution by adding a silicone oil thereto, and the mixed solution is impregnated with fibers And then dried and molded in the form of a damper to give shape stability.
According to another aspect of the present invention, the polyurethane resin has a modulus of 100% to 300%.
According to another embodiment of the present invention, the curing agent is an amine or a polyamide. Preferably hexamethylenetetramine can be used.
According to another aspect of the present invention, there is provided a method of manufacturing a speaker damper having excellent durability.
A diluent is prepared by mixing a polyurethane resin, a hardener, toluene and dimethylformamide (DMF) at a certain ratio, and a silicone oil which imparts flexibility to the diluent is added to the diluent and mixed Preparing a mixed solution;
Impregnating the mixed solution with fibers;
Drying the impregnated fiber through a dryer;
Molding the dried fiber into a mold having a shape of upper and lower dampers, and pressing the molded fiber by pressing; And
And cutting the formed fibers to form inner and outer diameters.
According to another aspect of the present invention, the ratio of the polyurethane resin to the curing agent is 1: 0.1-0.5.
According to another embodiment of the present invention, the mixing ratio of toluene and dimethylformamide (DMF) used as a diluent to the polyurethane resin is 1: 3: 3 by weight of polyurethane resin: toluene: DMF .
According to still another aspect of the present invention, the silicone oil imparting flexibility is added in an amount of 0.5 to 2% by weight based on the total diluted solution.
The dampers for speakers having excellent durability and the method of manufacturing the same having the above-described structure according to the present invention are excellent in moldability and shape stability, while using a curing resin in which a curing agent and a diluent are added to a polyurethane having specific physical properties, The present invention also provides an eco-friendly invention for solving the problem of the above-described conventional damper by providing the durability of such a degree that the resin does not come off or crack even with a large amplitude of bass. The damper can be applied to various sound devices.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a flowchart of a manufacturing process of a speaker damper according to a preferred embodiment of the present invention,
FIG. 2 is a cross-sectional view showing a configuration of a conventional general speaker,
Fig. 3 is a plan view showing a kind of corrugation type dampers used in a conventional speaker, Fig. 3a is a plan view of a product that is thermally formed as a whole, and Fig. 3b is a plan view to be.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it is needless to say that the scope of the present invention is not limited thereto.
In this specification, the present embodiments are provided to provide a complete disclosure of the present invention and to fully disclose the scope of the invention to a person having ordinary skill in the art to which the present invention belongs. It is only defined by the claims. Accordingly, in some embodiments, well known components, well known operations, and well-known techniques are not specifically described to avoid an undesirable interpretation of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular forms include plural forms unless otherwise specified in the specification. Also, components and acts referred to as " comprising (or comprising) " do not exclude the presence or addition of one or more other components and operations.
According to a preferred embodiment of the present invention, the speaker dampers having excellent durability of the present invention are formed of a polyurethane resin, a curing agent, toluene and dimethylformamide (DMF) in a predetermined ratio, preferably 1: 0.1 To 0.5: 3: 3 to prepare a diluted solution, adding a silicone oil to the diluted solution, preferably 0.5 to 2% by weight based on the entire diluted solution, to prepare a mixed solution. The mixed solution is impregnated with fibers , Followed by drying and molding in the form of a damper.
According to another preferred embodiment of the present invention, it is particularly preferable that the polyurethane resin used for producing the damper of the present invention has a modulus of 100 to 300%. The modulus is generally used as a modulus of elasticity (Young's modulus) against tensile. When the modulus is less than 100%, flexibility is low, which may cause problems in the formability as a damper. When the modulus exceeds 300% The rigidity is lowered and the durability is lowered, which is not preferable.
As described above, the polyurethane resin to be used in accordance with the present invention is a polymer compound bonded by a urethane bond formed by a bond of a hydroxyl group and an isocyanic acid group. As the isocyanic acid group, tolylene diisocyanate (2,4- and 2,6- As a compound having a hydroxyl group, a polyester type having a polyether type such as polyoxypropylene glycol or polyoxypropylene-polyoxyethylene glycol and a polyester type mainly having a condensate of adipic acid and ethylene glycol . However, the use of reaction products of a urethane prepolymer and trimethylol propane, which are preferably but not limited to the reaction products of components comprising polyisocyanate and butanediol or pentanediol, It is suitable as a polyurethane resin composition having characteristic characteristics of the invention. The thus obtained polyurethane resin according to the present invention is excellent in impact resistance, abrasion resistance, rigidity, and the like, and is heat-insulating, and in particular, the modulus can be between 100 and 300%.
The polyisocyanate used in the present invention means at least two -N = C = O functional groups and / or two or more -N = C = S (isothiocyanate) groups such as diisocyanate or tri As well as isocyanates, including dimers and trimers or isomers of isocyanates, as well as isocyanates. Suitable isocyanates may form covalent bonds with reactive groups such as hydroxyl, thiol or amine functionalities. Isocyanates useful in the present invention can be branched or unbranched.
According to another preferred embodiment of the present invention, the curing agent may be an amine or a polyamide, more preferably hexamethylenetetramine may be used.
Hereinafter, a method for manufacturing a damper for speaker having excellent durability according to the present invention constructed as described above will be described in detail.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart showing a manufacturing process of a speaker damper according to a preferred embodiment of the present invention.
As described above, in the manufacturing process of the conventional speaker damper, the fabric is woven (plain weave) using fibers, the fabric is subjected to impregnation treatment for shape stability using a phenol resin after pretreatment, The shape of the damper was manufactured through molding. Specifically, in the conventional manufacturing method, fibers are impregnated into a dilute solution obtained by mixing phenol resin and methanol at a ratio of 1: 2 to 4, and dried at a temperature of 70 to 90 ° C for 10 to 20 minutes through a dryer, Molding by pressing by a mold, and cutting to form an inner diameter and an outer diameter. Therefore, there is a problem in environmental pollution due to the use of phenol and durability of the damper. Therefore, in the present invention, a substance which can impart moldability and shape stability equal to or higher than that of a phenol resin while excluding the use of a phenol resin is searched , And the use of polyurethane resin was established, and a specific manufacturing process using this was established.
As shown in FIG. 1, a method for manufacturing a damper for a speaker according to the present invention for achieving the above object comprises the steps of:
A silicone oil which imparts flexibility to a dilution solution obtained by mixing a polyurethane resin having a modulus of 100 to 300% with a curing agent, toluene and DMF in a ratio of 1: 0.1 to 0.5: 3: 3 is added to the whole diluted solution in an amount of 0.5 to 2% Impregnating the fibers with the impregnating solution;
Compressing the fibers to recover the fibers impregnated in the impregnation solution and compressing the fibers with a compactor;
Drying the impregnated fiber through a drier at a temperature of 100 to 150 DEG C for 60 seconds to 120 seconds;
A step of damper forming the dried fibers by pressing them into a metal mold of a vertical damper shape;
And a step of performing a cutting process for forming an inner diameter and an outer diameter when the molding is completed.
More specifically, the ratio of the curing agent to the polyurethane resin having a modulus of 100 to 300% is preferably 1: 0.1 to 0.5, more preferably 1: 0.5. If the proportion of the curing agent is more than 0.5, the formability becomes undesirable. The ratio of toluene to DMF used as a diluent is 1: 3: 3 relative to the total resin, but about 10% by weight of the silicone-based penetrating agent may be added to the total diluent for uniform infiltration of the impregnation solution into the fibers. If the ratio of toluene to DMF is less than the above ratio, the impregnation of the polyurethane into the fiber is not smooth and the moldability of the damper becomes poor. On the other hand, if the ratio exceeds the above range, So that the moldability of the damper is also poor, which is not preferable.
The dipping, squeezing, drying, pressing, and cutting processes of the present invention can be performed by conventional equipment, and the upper mold 180 To 220 deg. C and a lower mold temperature of 70 to 90 deg. C, a press pressure of 3 to 4 kg / cm2 and a press forming time of 10 to 15 seconds.
Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but it goes without saying that the scope of the present invention is not limited by these Examples and Comparative Examples.
Example 1
A diluent was prepared by mixing a polyurethane resin having a modulus of about 200% and an amine curing agent, toluene, and DMF in a weight ratio of 1: 0.5: 3: 3 to prepare a silicone resin. By weight, and about 10% by weight of a silicone-based penetrating agent was added to the total diluting agent in order to uniformly infiltrate the impregnation solution into the fiber to prepare a mixed solution. The mixed solution was impregnated with the fiber and compressed by a press. At this time, the roller pressure of the press was set to 2 to 4 kg /
The crimped fibers were dried in a drier at a temperature of about 120 DEG C for 90 seconds. After drying, press molding was performed for about 10 seconds at a temperature of about 200 ° C for a top mold and about 90 ° C for a bottom mold at a press pressure of 3 kg /
Example 2
A damper was produced in the same manner as in Example 1 except that a polyurethane resin having a modulus of about 100% was used.
Example 3
A damper was produced in the same manner as in Example 1 except that a polyurethane resin having a modulus of about 300% was used.
Comparative Example 1
A damper was produced in the same manner as in Example 1 except that a polyurethane resin having a modulus of about 50% was used.
Comparative Example 2
A damper was produced in the same manner as in Example 1 except that a polyurethane resin having a modulus of about 400% was used.
Comparative Example 3
A damper was produced in the same manner as in Example 1 except that a polyurethane resin, an amine curing agent, toluene, and DMF were used in a weight ratio of 1: 0.5: 2: 2.
Comparative Example 4
A damper was produced in the same manner as in Example 1 except that a polyurethane resin, an amine curing agent, toluene, and DMF were used in a weight ratio of 1: 0.5: 4: 4.
The speaker damper manufactured in accordance with the embodiment of the present invention can adjust the amplitude sufficiently even if the amplitude of the upper and lower vibration is increased in the middle and lower sound quality, Not only showed excellent durability as compared with the damper but also excellent moldability and shape stability of the damper. On the other hand, the dampers manufactured in accordance with Comparative Examples 1, 3, and 4 have a problem in that the dampers manufactured in accordance with the Comparative Example 2 have poor durability due to poor moldability, Was significantly inferior to the damper.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.
1 ---
3 --- Edge 4 --- Magnet
5 --- Damper 6 --- Frame
7 --- Voice coil
Claims (7)
Impregnating the mixed solution with fibers;
Drying the impregnated fiber through a dryer;
Molding the dried fiber into a mold having a shape of upper and lower dampers, and pressing the molded fiber by pressing; And
And cutting the formed fiber to form an inner diameter and an outer diameter of the fiber.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150057263A KR101676850B1 (en) | 2015-04-23 | 2015-04-23 | Damper for a speaker having an excellent durability and the manufacturing process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020150057263A KR101676850B1 (en) | 2015-04-23 | 2015-04-23 | Damper for a speaker having an excellent durability and the manufacturing process thereof |
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| KR20160127205A KR20160127205A (en) | 2016-11-03 |
| KR101676850B1 true KR101676850B1 (en) | 2016-11-18 |
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| KR1020150057263A KR101676850B1 (en) | 2015-04-23 | 2015-04-23 | Damper for a speaker having an excellent durability and the manufacturing process thereof |
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| CN110876110B (en) * | 2018-08-29 | 2022-02-01 | 大原博 | Apparatus and method for manufacturing vibrating piece of loudspeaker with shaped cut |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003289594A (en) | 2002-01-24 | 2003-10-10 | Matsushita Electric Ind Co Ltd | Diaphragm for speaker, and polyamide-imide resin and polyimide resin to be used therefor |
| US20050161138A1 (en) | 2004-01-27 | 2005-07-28 | Naoki Yukawa | Tire noise reducing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE602004009533T2 (en) * | 2004-03-16 | 2008-07-24 | Sumitomo Rubber Industries Ltd., Kobe | Tire with silencer |
| HUP0600808A3 (en) | 2006-10-27 | 2008-09-29 | Richter Gedeon Nyrt | New benzamide derivatives as bradykinin antagonists, process for their preparation and pharmaceutical compositions containing them |
| KR20060132536A (en) | 2006-12-08 | 2006-12-21 | 최양원 | Restorative food for atopic skin diseases |
| KR20090101621A (en) | 2008-03-24 | 2009-09-29 | 에스텍 주식회사 | Speaker |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003289594A (en) | 2002-01-24 | 2003-10-10 | Matsushita Electric Ind Co Ltd | Diaphragm for speaker, and polyamide-imide resin and polyimide resin to be used therefor |
| US20050161138A1 (en) | 2004-01-27 | 2005-07-28 | Naoki Yukawa | Tire noise reducing system |
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