WO2009107938A2 - Magnesium diaphragm with built-in bobbin and method for same - Google Patents
Magnesium diaphragm with built-in bobbin and method for same Download PDFInfo
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- WO2009107938A2 WO2009107938A2 PCT/KR2009/000673 KR2009000673W WO2009107938A2 WO 2009107938 A2 WO2009107938 A2 WO 2009107938A2 KR 2009000673 W KR2009000673 W KR 2009000673W WO 2009107938 A2 WO2009107938 A2 WO 2009107938A2
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- bobbin
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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
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
- H04R7/127—Non-planar diaphragms or cones dome-shaped
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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
Definitions
- the present invention relates to a bobbin integrated magnesium diaphragm and a method for manufacturing the same, and more particularly, to a magnesium bobbin integrated diaphragm and a method for manufacturing the same, which can reduce a defect rate and reduce thickness.
- a bobbin integrated diaphragm has been used to eliminate the bonding process between the dome and the bobbin and to improve the quality of the diaphragm itself.
- Japanese Patent Laid-Open No. 2005-333322 discloses a bobbin integrated magnesium diaphragm 10 and a method of manufacturing the same as shown in FIG.
- a magnesium sheet having a thickness of 30 to 100 ⁇ m is produced by repeatedly rolling a heated magnesium substrate in a plurality of times after heating the magnesium substrate, and the dome 11 is formed by press molding the magnesium sheet.
- the thickness t in which the bobbin 12 is integrated produces a diaphragm 10 having a thickness of 30 to 100 ⁇ m.
- the magnesium sheet is thinned first, and then the bobbin-integrated magnesium diaphragm is press-molded by a batch process, it can be seen in FIG. 1 when press-molding to form a thin diaphragm of about 30 ⁇ m.
- the wrinkles 13 may be generated in the bobbin 12 in the pressure direction, or the wrinkles 14 may be generated in the dome 11.
- the dome 11 or the bobbin 12 may be broken.
- the wrinkles 13 and 14 generated in the dome 11 and the bobbin 12 are treated as defective because they may affect the sound quality of the diaphragm 10.
- the magnesium diaphragm is unlikely to be thinner, unlike the aluminum diaphragm, because the workability of magnesium itself is inferior to that of aluminum.
- mold failure is inevitable.
- FIG. 1 is a partial cutaway perspective view of a conventional bobbin-integrated magnesium diaphragm.
- FIGS. 2 to 6 are cross-sectional views sequentially showing a method of manufacturing a bobbin-integrated magnesium diaphragm according to a preferred embodiment of the present invention.
- the present invention has been made to solve the above problems, and an object of the present invention is to provide a method for manufacturing a bobbin-integrated magnesium diaphragm which can easily manufacture a thin bobbin-integrated magnesium diaphragm, and a bobbin-integrated magnesium diaphragm manufactured accordingly. .
- the present invention provides a die having a circular opening, and supporting a flat magnesium foil having a first thickness at a first pressure; Pressurizing the magnesium foil to form a hemispherical dome in the magnesium foil, and supporting the magnesium foil at a second pressure less than the first pressure by the die; Causing a punch to further introduce the hemispherical dome into the opening of the die to form a bobbin extending cylindrically from the surface of the magnesium foil to the edge of the hemispherical dome, and cutting off the edge of the bobbin from the magnesium foil And etching at least the hemispherical dome to a second thickness thinner than the first thickness.
- a method for manufacturing a one-piece bobbin magnesium diaphragm comprising the step.
- the first thickness may be 50 ⁇ m or more and 100 ⁇ m or less, and the second thickness may be 30 ⁇ m or more and less than 50 ⁇ m.
- the first pressure may be 120 to 300 kgf, and the second pressure may be 30 to 90 kgf.
- the present invention also includes a hemispherical dome provided in a hemispherical shape, comprising a hemispherical dome made of magnesium material, a bobbin integrally formed with the hemispherical dome by magnesium material, and extending cylindrically from an edge of the hemispherical dome.
- Silver has a first thickness
- the bobbin provides a bobbin-integrated magnesium diaphragm having a second thickness thicker than the first thickness.
- the first thickness may be 50 ⁇ m or more and 100 ⁇ m or less, and the second thickness may be 30 ⁇ m or more and less than 50 ⁇ m.
- magnesium foil W having a first thickness t1 is prepared.
- Magnesium foil (W) is provided in a flat sheet shape, it may be formed by warm molding.
- the 1st thickness t1 of such magnesium foil W is 50 micrometers or more and 100 micrometers or less. If the thickness is less than 50 ⁇ m, the failure rate during press molding using magnesium foil (W) may be high. In addition, since the bobbin is formed too thin as will be described later, the rigidity of the bobbin is reduced, so that unnecessary resonance occurs easily, the sound is distorted, and there is a difficulty in winding the coil. If the magnesium foil (W) exceeds 100 ⁇ m the weight of the diaphragm is heavy, the efficiency of converting the input signal into the output sound pressure is reduced and the sound sensitivity is lowered.
- the magnesium foil W having the first thickness t1 is supported on the die 31.
- the die 31 has an opening 32 through which the punch 33 can be inserted, and the planar shape of the opening 32 can be circular.
- the die 31 moves in the direction of the punch 33 in a state in which the magnesium foil W is supported.
- the punch 33 is located corresponding to the position of the opening 32, the punch 33 presses the magnesium foil (W) in accordance with the movement of the die 31, whereby the magnesium foil (W) It is molded into a dome 21 as shown in FIG. Therefore, it is preferable that the punch 33 is formed so that the press surface may correspond to the shape of the dome 21 to be formed.
- the die 31 supports the magnesium foil W at the first pressure P1, which may be 120 to 300 kgf.
- the dome 21 may be formed by moving the punch 33 toward the die 31 in a state in which the die 31 supports the magnesium foil W. As shown in FIG.
- the dome 21 may be formed by the shape of the pressing surface of the punch 33, in addition to the die 31 is provided with a mold corresponding to the shape of the pressing surface of the punch 33, and stably It is also possible to allow the dome 21 to be molded.
- the die 31 moves in the direction of the punch 33 while supporting the second pressure P2, whereby the dome 21 is pressed by the punch 33.
- the bobbin 22 extending from the dome 21 is molded as shown in FIG. 4 so as to be further drawn into the opening of the die 31.
- the second pressure P2 is a pressure smaller than the first pressure, and preferably 30 to 90 kgf.
- the second pressure P2 exceeds 90 kgf, cracks may be generated in the bobbin area, and in the case where the second pressure P2 is less than 30 kgf, wrinkles 13 may be generated in the bobbin area.
- the dome 21 may be formed by moving the punch 33 toward the die 31 in the state where the die 31 supports the magnesium foil W as described above.
- the bobbin 22 is shaped to extend in a cylindrical shape from the edge of the dome 21 as shown in FIG. 4.
- the bobbin-integrated diaphragm 20 is cut by cutting a portion connected to the magnesium foil W at the edge of the bobbin 22. Is separated from the magnesium foil (W).
- the diaphragm is thinly formed to realize high sensitivity.
- the diaphragm is less than 30 ⁇ m, the shape itself is difficult to maintain because of the inferior rigidity, and thus the sound quality may be degraded.
- it is 50 ⁇ m or more, it may be difficult to realize high sensitivity.
- Etching of the dome 21 is preferably performed in a pickling process. After forming the marking portion 40 on the surface of the bobbin 22 to secure the rigidity of the bobbin 22 portion, only the dome 21 is partially pickled. do. Accordingly, as shown in FIG. 7, the diaphragm 20 has a first thickness t1 of the bobbin 22 and a second thickness t2 of the dome 21, thereby thinning the dome 21 to serve as a diaphragm. That is, the bobbin 22 can be thickened, and the bobbin 22 can be thickened so that the rigidity can be maintained during coil winding, and the rigidity can be prevented from causing unnecessary resonance.
- the whole diaphragm can also be shape
- the magnesium alloy AZ31 was rolled to 50 ⁇ m, first warmed at 140 kgf to form a dome having a diameter of 20 mm, and second warm at 70 kgf to form a bobbin having a length of 6 mm. Thereafter, the whole diaphragm was immersed in 0.1-4% nitric acid solution for 20 seconds to have a thickness of 30 ⁇ m and washed with water.
- the magnesium alloy AZ31 was rolled to 50 ⁇ m, first warmed at 140 kgf to form a dome having a diameter of 20 mm, and second warm at 70 kgf to form a bobbin having a length of 6 mm. Subsequently, after masking the bobbin, the dome portion was immersed in 0.1-4% nitric acid solution for 10 seconds to have a thickness of 40 ⁇ m. After washing with water, masking was removed.
- the magnesium alloy AZ31 was rolled to 30 mu m, and then warm molded at 70 kgf to form a dome having a diameter of 20 mm and a bobbin having a length of 6 mm.
- Examples 1 and 2 according to the present invention does not generate wrinkles in the bobbin, it is possible to realize a high sensitivity.
- the bobbin stiffness may be higher than that of the comparative example even in the case of Example 1 in which the thickness of the bobbin is reduced to 30 ⁇ m because wrinkle defects do not occur in the bobbin.
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Abstract
The present invention relates to a thin magnesium diaphragm with a built-in bobbin and a method for manufacturing the same in a simple fashion. The magnesium diaphragm of the present invention includes a semi-spherical dome made of a magnesium material, and a bobbin made of a magnesium material, formed integrally with the semi-spherical dome and extended into a cylindrical shape from an edge of the semi-spherical dome. The semi-spherical dome has a first thickness, and the bobbin has a second thickness thicker than the first thickness.
Description
본 발명은 보빈 일체형 마그네슘 진동판 및 그 제조 방법에 관한 것으로, 보다 상세하게는 불량률을 줄이고 박형화가 가능한 마그네슘 보빈 일체형 진동판 및 그 제조방법에 관한 것이다. The present invention relates to a bobbin integrated magnesium diaphragm and a method for manufacturing the same, and more particularly, to a magnesium bobbin integrated diaphragm and a method for manufacturing the same, which can reduce a defect rate and reduce thickness.
종래 스피커를 구성하는 진동판으로서는 알루미늄이나 티타늄 등이 사용되어 왔으나, 최근에는 마그네슘으로 만들어진 진동판을 사용하고 있다. 마그네슘 진동판의 경우 비중이 낮아 감도 및 고주파 대역에서 출력음압이 우수해 그 사용이 늘고 있다. Conventionally, aluminum or titanium has been used as the diaphragm constituting the speaker, but recently, a diaphragm made of magnesium is used. Magnesium diaphragm has low specific gravity, and its use is increasing due to its excellent sensitivity and output sound pressure in high frequency band.
또한, 최근에는 돔과 보빈의 접합 공정을 없애고 진동판 자체의 품질을 향상시키기 위해 보빈 일체형 진동판을 사용하고 있다.In addition, recently, a bobbin integrated diaphragm has been used to eliminate the bonding process between the dome and the bobbin and to improve the quality of the diaphragm itself.
일본 특허 공개공보 특개2005-333322호에는 도 1에서 볼 수 있는 보빈 일체형 마그네슘 진동판(10) 및 그 제조방법이 개시되어 있다. 개시된 문헌에 따르면, 마그네슘 기판을 가열한 후 가열된 마그네슘 기판을 복수회에 걸쳐 단계적으로 반복 압연해 두께 30 내지 100㎛인 마그네슘 시트를 제조하고, 이 마그네슘 시트를 프레스 성형함에 따라 돔(11)과 보빈(12)이 일체로 된 두께(t)가 30 내지 100㎛의 진동판(10)을 제조하는 것이다. Japanese Patent Laid-Open No. 2005-333322 discloses a bobbin integrated magnesium diaphragm 10 and a method of manufacturing the same as shown in FIG. According to the disclosed literature, a magnesium sheet having a thickness of 30 to 100 µm is produced by repeatedly rolling a heated magnesium substrate in a plurality of times after heating the magnesium substrate, and the dome 11 is formed by press molding the magnesium sheet. The thickness t in which the bobbin 12 is integrated produces a diaphragm 10 having a thickness of 30 to 100 µm.
그런데, 이 경우에는 먼저 마그네슘 시트를 박형화한 후 이를 이용해 보빈 일체형 마그네슘 진동판을 일괄 공정에 의해 프레스 성형하는 것이기 때문에, 30 ㎛ 정도의 얇은 진동판을 형성하기 위해 프레스 성형할 경우에는, 도 1에서 볼 수 있듯이 보빈(12)에 압력 방향으로 주름(13)이 발생되거나, 돔(11)에도 주름(14)이 발생될 수 있다. 또, 돔(11)이나 보빈(12)이 깨질 수도 있다. 이렇게 돔(11) 및 보빈(12)에 발생된 주름(13)(14)은 진동판(10)의 음질에 영향을 줄 수 있기 때문에 불량으로 처리된다. However, in this case, since the magnesium sheet is thinned first, and then the bobbin-integrated magnesium diaphragm is press-molded by a batch process, it can be seen in FIG. 1 when press-molding to form a thin diaphragm of about 30 μm. As shown, the wrinkles 13 may be generated in the bobbin 12 in the pressure direction, or the wrinkles 14 may be generated in the dome 11. In addition, the dome 11 or the bobbin 12 may be broken. The wrinkles 13 and 14 generated in the dome 11 and the bobbin 12 are treated as defective because they may affect the sound quality of the diaphragm 10.
이처럼 마그네슘 진동판은 알루미늄 진동판과 달리 박형화하기 어려운 데, 이는 마그네슘 자체의 가공성이 알루미늄보다 떨어지기 때문이다. 이렇게 가공성이 떨어지는 마그네슘을 위 일본 특허 공개공보 특개2005-333322호의 기술과 같이 일괄 프레스 성형할 경우, 성형 불량은 피할 수 없게 된다.As such, the magnesium diaphragm is unlikely to be thinner, unlike the aluminum diaphragm, because the workability of magnesium itself is inferior to that of aluminum. In the case of collectively press-molding magnesium having such poor workability as described in Japanese Patent Laid-Open No. 2005-333322, mold failure is inevitable.
도 1은 종래의 보빈 일체형 마그네슘 진동판을 도시한 부분 절개 사시도이다. 1 is a partial cutaway perspective view of a conventional bobbin-integrated magnesium diaphragm.
도 2 내지 도 6은 본 발명의 바람직한 일 실시예에 따른 보빈 일체형 마그네슘 진동판의 제조방법을 순차적으로 도시한 단면도들이다.2 to 6 are cross-sectional views sequentially showing a method of manufacturing a bobbin-integrated magnesium diaphragm according to a preferred embodiment of the present invention.
도 7은 본 발명의 바람직한 일 실시예에 따른 보빈 일체형 마그네슘 진동판이다.7 is a bobbin integrated magnesium diaphragm according to a preferred embodiment of the present invention.
본 발명은 상기와 같은 문제점을 해결하기 위한 것으로, 박형의 보빈 일체형 마그네슘 진동판을 간단하게 제조할 수 있는 보빈 일체형 마그네슘 진동판의 제조 방법 및 이에 따라 제조된 보빈 일체형 마그네슘 진동판을 제공하는 데에 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for manufacturing a bobbin-integrated magnesium diaphragm which can easily manufacture a thin bobbin-integrated magnesium diaphragm, and a bobbin-integrated magnesium diaphragm manufactured accordingly. .
상기와 같은 목적을 달성하기 위하여, 본 발명은, 원형의 개구를 갖는 다이로 제1두께를 갖는 편평한 마그네슘박을 제1압력으로 지지하는 단계와, 상기 개구에 대응되도록 위치한 펀치가 상기 마그네슘박을 상기 다이의 개구로 유입시키도록 하는 것으로, 상기 마그네슘박을 가압해 상기 마그네슘박에 반구형 돔을 형성하는 단계와, 상기 다이로 상기 마그네슘박을 상기 제1압력보다 작은 제2압력으로 지지하고, 상기 펀치가 상기 반구형 돔을 상기 다이의 개구로 더욱 유입시키도록 해 상기 마그네슘박의 표면으로부터 상기 반구형 돔의 가장자리까지 원통상으로 연장된 보빈을 형성하는 단계와, 상기 보빈의 가장자리를 상기 마그네슘박으로부터 절단하는 단계와, 적어도 상기 반구형 돔을 에칭해 상기 제1두께보다 얇은 제2두께로 형성하는 단계를 포함하는 보빈 일체형 마그네슘 진동판의 제조방법을 제공한다.In order to achieve the above object, the present invention provides a die having a circular opening, and supporting a flat magnesium foil having a first thickness at a first pressure; Pressurizing the magnesium foil to form a hemispherical dome in the magnesium foil, and supporting the magnesium foil at a second pressure less than the first pressure by the die; Causing a punch to further introduce the hemispherical dome into the opening of the die to form a bobbin extending cylindrically from the surface of the magnesium foil to the edge of the hemispherical dome, and cutting off the edge of the bobbin from the magnesium foil And etching at least the hemispherical dome to a second thickness thinner than the first thickness. Provides a method for manufacturing a one-piece bobbin magnesium diaphragm, comprising the step.
상기 제1두께는 50㎛ 이상, 100㎛ 이하일 수 있고, 상기 제2두께는 30㎛이상, 50㎛미만일 수 있다.The first thickness may be 50 μm or more and 100 μm or less, and the second thickness may be 30 μm or more and less than 50 μm.
상기 제1압력은 120 내지 300 kgf일 수 있고, 상기 제2압력은 30 내지 90kgf일 수 있다.The first pressure may be 120 to 300 kgf, and the second pressure may be 30 to 90 kgf.
본 발명은 또한, 반구형으로 구비되고, 마그네슘재로 이루어진 반구형 돔과, 마그네슘재에 의해 상기 반구형 돔과 일체로 이루어지고, 상기 반구형 돔의 가장자리로부터 원통상으로 연장된 보빈을 포함하고, 상기 반구형 돔은 제1두께를 갖고, 상기 보빈은 상기 제1두께보다 두꺼운 제2두께를 갖는 보빈 일체형 마그네슘 진동판을 제공한다.The present invention also includes a hemispherical dome provided in a hemispherical shape, comprising a hemispherical dome made of magnesium material, a bobbin integrally formed with the hemispherical dome by magnesium material, and extending cylindrically from an edge of the hemispherical dome. Silver has a first thickness, and the bobbin provides a bobbin-integrated magnesium diaphragm having a second thickness thicker than the first thickness.
상기 제1두께는 50㎛ 이상, 100㎛ 이하이고, 상기 제2두께는 30㎛이상, 50㎛ 미만일 수 있다.The first thickness may be 50 μm or more and 100 μm or less, and the second thickness may be 30 μm or more and less than 50 μm.
상기와 상기와 같은 본 발명에 따르면, 반구형 돔과 보빈을 다른 압력으로 성형함으로써, 보빈 성형 시의 주름 발생률 혹은 깨짐 불량률을 현저히 줄 일 수 있다.According to the present invention as described above, by forming the hemispherical dome and the bobbin at different pressures, it is possible to significantly reduce the wrinkle occurrence rate or the failure failure rate at the time of bobbin molding.
또한, 보다 두꺼운 마그네슘박에 의해 진동판을 성형한 후, 이를 에칭하여 얇은 진동판을 얻음으로써, 감도가 뛰어난 진동판을 불량없이 얻을 수 있다.In addition, after forming the diaphragm by thicker magnesium foil and etching it to obtain a thin diaphragm, a diaphragm excellent in sensitivity can be obtained without defect.
그리고, 진동판의 돔의 두께만을 줄이고, 보빈은 보다 두꺼운 형태로 유지함으로써, 고감도와 보빈강성확보를 동시에 만족시킬 수 있다.Further, by only reducing the thickness of the dome of the diaphragm and maintaining the bobbin in a thicker form, it is possible to satisfy both high sensitivity and bobbin rigidity at the same time.
이하에서는 첨부된 도면을 참조로 본 발명의 바람직한 실시예에 대하여 더욱 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.
도 2 내지 도 6은 본 발명의 일 실시예에 따른 보빈 일체형 마그네슘 진동판의 제조방법을 순차적으로 도시한 것이다.2 to 6 sequentially illustrate a method of manufacturing a bobbin integrated magnesium diaphragm according to an embodiment of the present invention.
먼저, 제1두께(t1)를 갖는 마그네슘박(W)을 준비한다. 마그네슘박(W)은 편평한 시트상으로 구비되며, 온간 성형으로 형성될 수 있다. First, magnesium foil W having a first thickness t1 is prepared. Magnesium foil (W) is provided in a flat sheet shape, it may be formed by warm molding.
이러한 마그네슘박(W)의 제1두께(t1)는 50㎛이상, 100㎛이하인 것이 바람직하다. 50㎛미만의 두께일 경우, 마그네슘박(W)을 이용한 프레스 성형 시 불량률이 높아질 수 있다. 또한, 후술하는 바와 같이 보빈이 너무 얇게 형성되기 때문에 보빈의 강성이 떨어져 불필요한 공진이 생기기 쉬워 음이 일그러지고, 코일 권취 시 어려움이 있게 된다. 마그네슘박(W)이 100㎛를 초과할 경우 진동판의 무게가 무거워져 입력신호를 출력 음압으로 변환하는 능률이 저하되고 음향감도가 떨어진다.It is preferable that the 1st thickness t1 of such magnesium foil W is 50 micrometers or more and 100 micrometers or less. If the thickness is less than 50㎛, the failure rate during press molding using magnesium foil (W) may be high. In addition, since the bobbin is formed too thin as will be described later, the rigidity of the bobbin is reduced, so that unnecessary resonance occurs easily, the sound is distorted, and there is a difficulty in winding the coil. If the magnesium foil (W) exceeds 100㎛ the weight of the diaphragm is heavy, the efficiency of converting the input signal into the output sound pressure is reduced and the sound sensitivity is lowered.
상기와 같이 제1두께(t1)를 갖는 마그네슘박(W)을 다이(31)에 지지한다. 이 때, 다이(31)는 펀치(33)가 삽입될 수 있도록 개구(32)를 구비하고 있으며, 이 개구(32)의 평면 형상은 원형이 될 수 있다. As described above, the magnesium foil W having the first thickness t1 is supported on the die 31. At this time, the die 31 has an opening 32 through which the punch 33 can be inserted, and the planar shape of the opening 32 can be circular.
이렇게 다이(31)가 마그네슘박(W)을 지지한 상태에서 펀치(33)의 방향으로 이동한다. 상기 펀치(33)는 상기 개구(32)의 위치에 대응되게 위치하며, 다이(31)의 이동에 따라 펀치(33)가 마그네슘박(W)을 가압하고, 이에 따라, 마그네슘박(W)은 도 3과 같은 돔(21)으로 성형된다. 따라서, 펀치(33)는 그 가압면이 형성될 돔(21)의 형상에 대응되도록 형성되어 있는 것이 바람직하다. 이 때, 다이(31)는 제1압력(P1)으로 마그네슘박(W)을 지지하는 데, 이 제1압력(P1)은 120 내지 300kgf 일 수 있다. 제1압력(P1)이 300kgf를 초과하게 되면 마찰력의 증가에 따라 마그네슘박(W)의 두께가 얇아지는 네킹과 크랙이 발생할 수 있고, 120kgf 미만일 경우 돔(21)에 도 1에서 볼 수 있었던 주름(14)이 발생될 수 있다. 상기 다이(31)가 마그네슘박(W)을 지지한 상태에서 펀치(33)를 다이(31) 방향으로 이동시켜 돔(21)을 성형하여도 무방하다.In this way, the die 31 moves in the direction of the punch 33 in a state in which the magnesium foil W is supported. The punch 33 is located corresponding to the position of the opening 32, the punch 33 presses the magnesium foil (W) in accordance with the movement of the die 31, whereby the magnesium foil (W) It is molded into a dome 21 as shown in FIG. Therefore, it is preferable that the punch 33 is formed so that the press surface may correspond to the shape of the dome 21 to be formed. In this case, the die 31 supports the magnesium foil W at the first pressure P1, which may be 120 to 300 kgf. When the first pressure P1 exceeds 300 kgf, necking and cracks may be caused to decrease the thickness of the magnesium foil W as the frictional force increases, and when the first pressure P1 is less than 120 kgf, the wrinkles seen in FIG. (14) may be generated. The dome 21 may be formed by moving the punch 33 toward the die 31 in a state in which the die 31 supports the magnesium foil W. As shown in FIG.
한편, 상기 돔(21)은 펀치(33)의 가압면 형상에 의해 성형될 수 있는 데, 이 밖에도 다이(31)에 펀치(33)의 가압면 형상에 대응되는 금형을 더 구비시켜, 안정적으로 돔(21)이 성형될 수 있도록 할 수도 있다.On the other hand, the dome 21 may be formed by the shape of the pressing surface of the punch 33, in addition to the die 31 is provided with a mold corresponding to the shape of the pressing surface of the punch 33, and stably It is also possible to allow the dome 21 to be molded.
도 3과 같이 돔(21)을 성형한 후에 다이(31)는 제2압력(P2)으로 지지하면서 상기 펀치(33)의 방향으로 이동함으로써, 펀치(33)의 가압에 의해 상기 돔(21)이 다이(31)의 개구 내측으로 더욱 인입되도록 해 도 4와 같이 돔(21)으로부터 연장된 보빈(22)을 성형한다. 이 때, 제2압력(P2)은 제1압력보다 작은 압력이며, 30 내지 90kgf인 것이 바람직하다. 제2압력(P2)이 90kgf을 초과할 경우 보빈 부위에 크랙이 발생될 수 있고, 30kgf 미만일 경우 보빈 부위에 도 1에서 볼 수 있었던 주름(13)이 발생할 수 있다. 그리고, 이 경우에도 전술한 바와 같이 상기 다이(31)가 마그네슘박(W)을 지지한 상태에서 펀치(33)를 다이(31) 방향으로 이동시켜 돔(21)을 성형하여도 무방하다.After forming the dome 21 as shown in FIG. 3, the die 31 moves in the direction of the punch 33 while supporting the second pressure P2, whereby the dome 21 is pressed by the punch 33. The bobbin 22 extending from the dome 21 is molded as shown in FIG. 4 so as to be further drawn into the opening of the die 31. At this time, the second pressure P2 is a pressure smaller than the first pressure, and preferably 30 to 90 kgf. When the second pressure P2 exceeds 90 kgf, cracks may be generated in the bobbin area, and in the case where the second pressure P2 is less than 30 kgf, wrinkles 13 may be generated in the bobbin area. Also in this case, the dome 21 may be formed by moving the punch 33 toward the die 31 in the state where the die 31 supports the magnesium foil W as described above.
보빈(22)은 도 4에서 볼 수 있듯이 돔(21)의 가장자리로부터 원기둥 형상으로 연장되도록 성형된다. The bobbin 22 is shaped to extend in a cylindrical shape from the edge of the dome 21 as shown in FIG. 4.
도 4와 같은 돔(21)과 보빈(22)의 성형이 끝난 후에는 도 5에서 볼 수 있듯이, 보빈(22)의 가장자리의 마그네슘박(W)과 연결된 부분을 절단해 보빈 일체형 진동판(20)을 마그네슘박(W)으로부터 분리한다.After the molding of the dome 21 and the bobbin 22 as shown in FIG. 4 is completed, as shown in FIG. 5, the bobbin-integrated diaphragm 20 is cut by cutting a portion connected to the magnesium foil W at the edge of the bobbin 22. Is separated from the magnesium foil (W).
다음으로는 도 6에서 볼 수 있듯이, 적어도 돔(21) 부분을 에칭하여, 이 돔(21) 부분이 제1두께(t1)보다 얇은 제2두께(t2)가 되도록 한다. 이 때, 제2두께(t2)는 30㎛이상, 50㎛미만이 되도록 하는 것이 바람직하다. 전술한 바와 같이, 진동판은 고감도 실현을 위해 얇게 형성하는 것이 바람직한 데, 30㎛ 미만일 경우, 강성이 떨어지기 때문에 형상 자체가 유지되기 어렵고, 이에 따라 소리 품질이 떨어질 수 있다. 또한, 50㎛ 이상일 경우 고감도 실현이 어려워질 수 있다. Next, as shown in FIG. 6, at least part of the dome 21 is etched so that the part of the dome 21 becomes a second thickness t2 thinner than the first thickness t1. At this time, it is preferable that the second thickness t2 is 30 µm or more and less than 50 µm. As described above, it is preferable that the diaphragm is thinly formed to realize high sensitivity. When the diaphragm is less than 30 μm, the shape itself is difficult to maintain because of the inferior rigidity, and thus the sound quality may be degraded. In addition, when it is 50 μm or more, it may be difficult to realize high sensitivity.
돔(21)의 에칭은 산세 공정으로 진행하는 것이 바람직한 데, 보빈(22) 부분의 강성 확보를 위해 보빈(22)의 표면에 마그킹부(40)를 형성한 후, 돔(21)만을 부분 산세한다. 이에 따라 도 7에서 볼 수 있듯이, 진동판(20)은 보빈(22)이 제1두께(t1), 돔(21)이 제2두께(t2)를 가져, 돔(21)을 얇게 해 진동판으로서의 특성, 즉, 감도를 향상시킴과 동시에, 보빈(22)은 두껍게 함으로서 코일 권취 시 강성이 유지되고, 강성이 높아 불필요 공진이 발생하지 않도록 할 수 있다. Etching of the dome 21 is preferably performed in a pickling process. After forming the marking portion 40 on the surface of the bobbin 22 to secure the rigidity of the bobbin 22 portion, only the dome 21 is partially pickled. do. Accordingly, as shown in FIG. 7, the diaphragm 20 has a first thickness t1 of the bobbin 22 and a second thickness t2 of the dome 21, thereby thinning the dome 21 to serve as a diaphragm. That is, the bobbin 22 can be thickened, and the bobbin 22 can be thickened so that the rigidity can be maintained during coil winding, and the rigidity can be prevented from causing unnecessary resonance.
그러나, 본 발명은 반드시 이에 한정되는 것은 아니고, 진동판 전체를 에칭에 의해 얇게 성형할 수도 있다.However, this invention is not necessarily limited to this, The whole diaphragm can also be shape | molded thinly by etching.
<실시예1>Example 1
마그네슘합금 AZ31을 50㎛로 압연한 뒤, 140kgf로 1차 온간 성형해 직경 20mm인 돔을 성형하고, 70kgf로 2차 온간 성형해 길이 6mm인 보빈을 성형했다. 그 뒤, 전체 진동판을 0.1~4%질산용액에 20초 침지시켜 두께가 30㎛가 되도록 한 후 수세하였다.The magnesium alloy AZ31 was rolled to 50 µm, first warmed at 140 kgf to form a dome having a diameter of 20 mm, and second warm at 70 kgf to form a bobbin having a length of 6 mm. Thereafter, the whole diaphragm was immersed in 0.1-4% nitric acid solution for 20 seconds to have a thickness of 30 µm and washed with water.
<실시예2>Example 2
마그네슘합금 AZ31을 50㎛로 압연한 뒤, 140kgf로 1차 온간 성형해 직경 20mm인 돔을 성형하고, 70kgf로 2차 온간 성형해 길이 6mm인 보빈을 성형했다. 그 뒤, 보빈을 마스킹한 후 0.1~4%질산용액에 10초 침지시켜 돔 부분을 두께 40㎛가 되도록 하였다. 이 후 수세한 후, 마스킹을 제거하였다.The magnesium alloy AZ31 was rolled to 50 µm, first warmed at 140 kgf to form a dome having a diameter of 20 mm, and second warm at 70 kgf to form a bobbin having a length of 6 mm. Subsequently, after masking the bobbin, the dome portion was immersed in 0.1-4% nitric acid solution for 10 seconds to have a thickness of 40 μm. After washing with water, masking was removed.
<비교예>Comparative Example
마그네슘합금 AZ31을 30㎛로 압연한 뒤, 70kgf로 온간 성형해 직경 20mm인 돔 및 길이 6mm인 보빈을 성형했다. The magnesium alloy AZ31 was rolled to 30 mu m, and then warm molded at 70 kgf to form a dome having a diameter of 20 mm and a bobbin having a length of 6 mm.
[표 1]TABLE 1
위 표 1에서 볼 수 있듯이, 본 발명에 따른 실시예1,2는 보빈에 주름도 발생하지 않고, 고감도 실현이 가능하다. 또한, 본 발명에 따른 실시예1,2는 보빈에 주름 불량이 발생하지 않기 때문에 보빈의 두께를 30㎛로 얇게 한 실시예1의 경우에도 보빈 강성이 비교예에 비해 높게 될 수 있다. As can be seen in Table 1, Examples 1 and 2 according to the present invention does not generate wrinkles in the bobbin, it is possible to realize a high sensitivity. In addition, in Examples 1 and 2 according to the present invention, the bobbin stiffness may be higher than that of the comparative example even in the case of Example 1 in which the thickness of the bobbin is reduced to 30 μm because wrinkle defects do not occur in the bobbin.
비교예의 경우에는 보빈에 주름이 발생하여 보빈 강성도 떨어뜨리고, 감도도 저하시킨다. In the case of a comparative example, wrinkles generate | occur | produce in a bobbin, and bobbin rigidity also falls and a sensitivity also falls.
상기에서는 본 발명의 바람직한 실시예를 참조하여 설명하였지만, 해당 기술 분야의 숙련된 당업자는 하기의 특허 청구의 범위에 기재된 본 발명의 사상 및 영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경시킬 수 있음을 이해할 수 있을 것이다. Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.
Claims (8)
- 원형의 개구를 갖는 다이로 제1두께를 갖는 편평한 마그네슘박을 제1압력으로 지지하는 단계; Supporting a flat magnesium foil having a first thickness at a first pressure with a die having a circular opening;상기 개구에 대응되도록 위치한 펀치가 상기 마그네슘박을 상기 다이의 개구로 유입시키도록 하는 것으로, 상기 마그네슘박을 가압해 상기 마그네슘박에 반구형 돔을 형성하는 단계; Pressurizing the magnesium foil to form a hemispherical dome in the magnesium foil by causing a punch positioned to correspond to the opening to introduce the magnesium foil into the opening of the die;상기 다이로 상기 마그네슘박을 상기 제1압력보다 작은 제2압력으로 지지하고, 상기 펀치가 상기 반구형 돔을 상기 다이의 개구로 더욱 유입시키도록 해 상기 마그네슘박의 표면으로부터 상기 반구형 돔의 가장자리까지 원통상으로 연장된 보빈을 형성하는 단계;The die supports the magnesium foil at a second pressure less than the first pressure, and causes the punch to further introduce the hemispherical dome into the opening of the die, thereby reducing the magnesium foil from the surface of the magnesium foil to the edge of the hemispherical dome. Forming an extended bobbin;상기 보빈의 가장자리를 상기 마그네슘박으로부터 절단하는 단계; 및Cutting the edge of the bobbin from the magnesium foil; And적어도 상기 반구형 돔을 에칭해 상기 제1두께보다 얇은 제2두께로 형성하는 단계;를 포함하는 보빈 일체형 마그네슘 진동판의 제조방법.Etching at least the hemispherical dome to form a second thickness thinner than the first thickness.
- 제 1항에 있어서, The method of claim 1,상기 제1두께는 50㎛ 이상, 100㎛ 이하인 보빈 일체형 마그네슘 진동판의 제조방법.The first thickness is 50㎛ or more, 100㎛ or less manufacturing method of the bobbin integrated magnesium diaphragm.
- 제1항에 있어서,The method of claim 1,상기 제2두께는 30㎛이상, 50㎛미만인 보빈 일체형 마그네슘 진동판의 제조방법.The second thickness is more than 30㎛, less than 50㎛ manufacturing method of the bobbin integrated magnesium diaphragm.
- 제1항에 있어서,The method of claim 1,상기 제1압력은 120 내지 300 kgf인 보빈 일체형 마그네슘 진동판의 제조방법.The first pressure is 120 to 300 kgf bobbin integrated magnesium diaphragm manufacturing method.
- 제1항에 있어서,The method of claim 1,상기 제2압력은 30 내지 90 kgf인 보빈 일체형 마그네슘 진동판의 제조방법.The second pressure is 30 to 90 kgf bobbin integrated magnesium diaphragm manufacturing method.
- 반구형으로 구비되고, 마그네슘재로 이루어진 반구형 돔; 및Hemispherical dome provided in a hemispherical shape, made of magnesium material; And마그네슘재에 의해 상기 반구형 돔과 일체로 이루어지고, 상기 반구형 돔의 가장자리로부터 원통상으로 연장된 보빈;을 포함하고,A bobbin formed integrally with the hemispherical dome by a magnesium material and extending cylindrically from an edge of the hemispherical dome;상기 반구형 돔은 제1두께를 갖고, 상기 보빈은 상기 제1두께보다 두꺼운 제2두께를 갖는 보빈 일체형 마그네슘 진동판.And said hemispherical dome has a first thickness and said bobbin has a second thickness thicker than said first thickness.
- 제6항에 있어서,The method of claim 6,상기 제1두께는 50㎛ 이상, 100㎛ 이하인 보빈 일체형 마그네슘 진동판.The said first thickness is 50 micrometers or more and 100 micrometers or less bobbin integrated magnesium diaphragm.
- 제6항에 있어서,The method of claim 6,상기 제2두께는 30㎛이상, 50㎛미만인 보빈 일체형 마그네슘 진동판.The second thickness is more than 30㎛, less than 50㎛ bobbin integrated magnesium diaphragm.
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KR960012932U (en) * | 1994-09-13 | 1996-04-17 | ||
KR20040096084A (en) * | 2003-05-07 | 2004-11-16 | 현대자동차주식회사 | Method for forming Al-Mg-Si aluminum alloy sheet |
JP2004349871A (en) * | 2003-05-20 | 2004-12-09 | Pioneer Electronic Corp | Magnesium diaphragm and its manufacturing method, and speaker system using the diaphragm |
JP2005333322A (en) * | 2004-05-19 | 2005-12-02 | Pioneer Electronic Corp | Bobbin-integrated magnesium diaphragm, its manufacturing method, and speaker device using the same |
KR20080001718A (en) * | 2006-06-29 | 2008-01-04 | 김태원 | Method of press-working of decorated metal panel and formed metal panel method thereof |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH05131224A (en) * | 1991-11-08 | 1993-05-28 | Furukawa Alum Co Ltd | Hot molding method for suppressing growth of surface oxide film |
-
2008
- 2008-02-28 KR KR1020080018535A patent/KR20090093167A/en not_active Application Discontinuation
-
2009
- 2009-02-12 WO PCT/KR2009/000673 patent/WO2009107938A2/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR960012932U (en) * | 1994-09-13 | 1996-04-17 | ||
KR20040096084A (en) * | 2003-05-07 | 2004-11-16 | 현대자동차주식회사 | Method for forming Al-Mg-Si aluminum alloy sheet |
JP2004349871A (en) * | 2003-05-20 | 2004-12-09 | Pioneer Electronic Corp | Magnesium diaphragm and its manufacturing method, and speaker system using the diaphragm |
JP2005333322A (en) * | 2004-05-19 | 2005-12-02 | Pioneer Electronic Corp | Bobbin-integrated magnesium diaphragm, its manufacturing method, and speaker device using the same |
KR20080001718A (en) * | 2006-06-29 | 2008-01-04 | 김태원 | Method of press-working of decorated metal panel and formed metal panel method thereof |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2505953A (en) * | 2012-09-18 | 2014-03-19 | B & W Group Ltd | Stepped thickness change in dome-shaped diaphragms for loudspeakers or microphones |
US9609437B2 (en) | 2012-09-18 | 2017-03-28 | B & W Group Ltd | Diaphragms for loudspeaker drive units |
US9866967B2 (en) | 2012-09-18 | 2018-01-09 | B & W Group Ltd. | Diaphragms for lousdspeaker drive units |
GB2505953B (en) * | 2012-09-18 | 2019-05-08 | B & W Group Ltd | Stepped thickness change in dome-shaped diaphragms for loudspeaker drive units or microphones |
Also Published As
Publication number | Publication date |
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KR20090093167A (en) | 2009-09-02 |
WO2009107938A3 (en) | 2009-11-26 |
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