KR20030077881A - A combination device of coupler for sintering - Google Patents
A combination device of coupler for sintering Download PDFInfo
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- KR20030077881A KR20030077881A KR1020020016848A KR20020016848A KR20030077881A KR 20030077881 A KR20030077881 A KR 20030077881A KR 1020020016848 A KR1020020016848 A KR 1020020016848A KR 20020016848 A KR20020016848 A KR 20020016848A KR 20030077881 A KR20030077881 A KR 20030077881A
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- coupler
- preform
- sintering
- rod
- coupling device
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01807—Reactant delivery systems, e.g. reactant deposition burners
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01846—Means for after-treatment or catching of worked reactant gases
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
본 발명은 소결용 커플러 결합장치에 관한 것으로, 보다 상세하게는 외부기상증착 공법으로 제조된 광섬유 모재를 소결로에서 소결하는 장치 중 커플러 장치에 관한 것이다.The present invention relates to a coupler coupling device for sintering, and more particularly to a coupler device of the apparatus for sintering the optical fiber base material prepared by the external vapor deposition method in the sintering furnace.
광섬유모재를 소결하는 공법으로서는 기상축 증착 공법(VAD; Vapor-phase Axial Deposition), 외부기상증착 공법(OVD; Outside Vapor Deposition) 등이 있는 바, 외부기상증착 공정은 현재 사용되는 광섬유 제조공정의 하나로서 증착율이 높고 모재를 크게 만들 수 있는 장점이 있으며, 토치로부터 분사된 연료인 H2, O2등이 연소하여 이들과 함께 생성 분출된 SiCl4, GeCl4등의 산화 및 가수분해에 의해 발생한 SiO2, GeO2등의 입자를 회전하는 실린더에 부착시키는 공정이다.The sintering method of the fiber base material includes Vapor-phase Axial Deposition (VAD) and Outside Vapor Deposition (OVD). As a result, the deposition rate is high and the base material can be made large, and SiO 2 generated by oxidation and hydrolysis of SiCl 4 , GeCl 4, etc., generated and ejected together with H 2 , O 2 , fuel injected from the torch, is combusted. 2 , GeO 2 and the like are attached to a rotating cylinder.
광섬유 모재를 생성하는 주입자인 SiO2는 원료물질 SiCl4가 CH4/O2연소생성물인 H2O와의 가수분해 반응을 거쳐 만들어 지거나, 1100℃ 이상에서 운반기체 O2와의 직접적인 산화반응으로 형성되는데 다음과 같은 반응이 일어난다.SiO 2 , an injector for producing an optical fiber base material, is formed through the hydrolysis reaction of the raw material SiCl 4 with H 2 O, a combustion product of CH 4 / O 2 , or by direct oxidation with a carrier gas O 2 above 1100 ° C. The following reactions occur:
SiCl4+ 2H2O →SiO2+ 4HCl (가수분해반응)SiCl 4 + 2H 2 O → SiO 2 + 4HCl (hydrolysis)
SiCl4+ 2O2→SiO2+ 2Cl2(산화반응)SiCl 4 + 2O 2 → SiO 2 + 2Cl 2 (oxidation reaction)
이 때 SiO2, GeO2등은 충돌, 응집 등의 과정을 거쳐 직경 0.2㎛ 정도의 입자가 되며 회전하는 모재에 부착된다.At this time, SiO 2 , GeO 2, and the like are particles having a diameter of about 0.2 μm through collision, agglomeration, and the like, and are attached to the rotating base material.
각 패스(pass)마다 화학가스 SiCl4, GeCl4등의 조성을 변화시켜 원하는 굴절율 분포를 갖도록 하며 원하는 증착두께가 되면 모봉을 입자 부착층으로부터 분리시켜 제거한 후 1400 ~ 1600℃의 온도를 유지하는 로(furnace)에서 건조 및 소결과정을 거쳐 모재상태로 제조한다.Change the composition of the chemical gases SiCl 4 , GeCl 4, etc. in each pass to have the desired refractive index distribution, and when the desired deposition thickness is reached, remove the woolen from the particle adhesion layer, and then maintain the temperature of 1400 ~ 1600 ℃. After the drying and sintering process in the furnace) to prepare a base material.
소결과정을 진행할 때는 증착입자 중 SiOH에 의한 흡수손실을 방지하기 위하여 Cl2및 He 가스를 흘려보내면서 소결하게 되는데 다음과 같은 반응이 일어나게 된다.In the sintering process, in order to prevent absorption loss due to SiOH among the deposited particles, sintering is carried out while flowing Cl 2 and He gas, and the following reaction occurs.
2H2O + 2Cl2→4HCl + O2 2H 2 O + 2Cl 2 → 4HCl + O 2
2SiOH + 2Cl2→2SiCl + 2HCl + O2 2SiOH + 2Cl 2 → 2SiCl + 2HCl + O 2
소결로 상부에 모터가 부착된 회전축은 프리폼과 연결된다. 이러한 회전축이 프리폼을 회전시키고 소결로를 통과시킴으로써 최종의 프리폼을 얻게 된다. 이러한 과정에서 프리폼과 회전축을 연결하는 방법은 소결된 프리폼의 품질에 매우 큰 영향을 미치게 되는데 회전축과 프리폼은 정렬이 되었다고 하더라도 프리폼과 연결 중 축정렬이 어긋나면 소결로와 먼저 접촉하게 되는 부분으로 프리폼이 변형을 일으키기 때문이다.The rotating shaft with the motor attached to the top of the sintering furnace is connected to the preform. This axis of rotation rotates the preform and passes through the sintering furnace to obtain the final preform. In this process, the method of connecting the preform and the rotating shaft has a great influence on the quality of the sintered preform. Even though the rotating shaft and the preform are aligned, the preform is the part that comes into contact with the sintering furnace if the shaft alignment is misaligned during the connection with the preform. This is because it causes deformation.
회전축과 프리폼을 연결하는 기존의 방법으로는 US Pat. 4,289,522, US Pat. 4,125,388 및 US Pat. 4,950,319 등에서 소개가 되어 있는데 종래의 방법은 회전축과 프리폼을 기계적으로 결합하는 방식으로서 연결부위에서 완벽한 수직을 맞추기가 어렵고, 프리폼로드에 핀홀을 뚫어 와이어(wire)로 결합하는 방식도 소결 중 프리폼의 하중에 의하여 깨어질 우려가 있어 프리폼 대형화가 불가능한 문제점이 있었다.The conventional method of connecting the rotating shaft and the preform is US Pat. 4,289,522, US Pat. 4,125,388 and US Pat. 4,950,319, etc. The conventional method is a method of mechanically coupling the rotating shaft and the preform, and it is difficult to achieve perfect vertical alignment at the connection part, and a method of connecting a pinhole to the preform rod by wire to connect the preform load during sintering There is a risk that it is broken by the preform can not be enlarged.
즉, 상기와 같은 종래기술은 프리폼과 회전축을 연결함에 있어서 정해진 치구 속에 프리폼로드를 끼우는 방식이거나 프리폼로드에 핀홀을 뚫는 등 기계적인 외력을 가하게 되어 소결장치에 장착하는 순간부터 수직도를 정확히 맞추기가 어려우며 프리폼로드에 핀홀을 뚫는 과정에서 발생한 크랙이 소결 중 전파되어 연결부위가 파괴되거나 파괴의 우려 때문에 소결하는 프리폼의 무게에 제한을 가져왔다. 따라서, 이는 원가절감이 강점으로 부각되는 외부기상 증착공법으로 대형프리폼을 제조하는 것이 곤란한 이유가 되어왔다.In other words, the prior art as described above is a method of fitting the preform rod into a predetermined jig when connecting the preform and the rotating shaft or by applying a mechanical external force such as drilling a pinhole on the preform rod to accurately adjust the verticality from the moment it is mounted on the sintering apparatus. It is difficult and the cracks generated during the drilling of the pinholes in the preform rod spread during the sintering, which leads to a limitation in the weight of the sintered preform due to the destruction of the connection or the fear of destruction. Therefore, this has been a reason why it is difficult to manufacture large preforms by an external vapor deposition method in which cost reduction is an important point.
본 발명은 상기와 같은 문제점을 해결하기 위하여 창작된 것으로서, 본 발명의 목적은 외부기상증착 공법으로 광섬유모재를 제조하기 위하여 필수적인 공정인 소결공정에서 기존의 방법과는 달리 프리폼로드에 기계적 외력을 가하지 않고, 대형 프리폼의 결합에도 문제가 없는 소결용 커플러 결합장치를 제공하는 것이다.The present invention was created to solve the above problems, and an object of the present invention is to apply a mechanical external force to the preform rod unlike the conventional method in the sintering process, which is an essential process for manufacturing the optical fiber base material by an external vapor deposition method. In addition, to provide a coupler coupling device for sintering that does not have any problem in the coupling of a large preform.
또한, 본 발명의 목적은 중력에 의하여 연직하방으로 정렬할 수 있을 뿐 아니라 정렬이상으로 발생할 수 있는 프리폼의 휨현상을 방지하고 종래의 방법의 단점인 허용하중 제한 문제를 해결할 수 있는 소결용 커플러 결합장치를 제공하는 것이다.In addition, the object of the present invention can be aligned vertically downward by gravity, as well as to prevent the bending of the preform that may occur due to the misalignment and sintering coupler coupling device that can solve the problem of limiting the allowable load which is a disadvantage of the conventional method To provide.
상기와 같은 본 발명의 목적은, 하부면이 개구된 중공의 형상이며, 측면으로 중심부를 관통하는 핀홀(32)이 형성된 커플러(30); 상기 커플러(30)의 상단부와 일체로 결합된 회전축로드(10); 및 일단은 핀(36)에 의하여 상기 핀홀(32)에 대응되어 결합되는 링(22)이 형성되어 있고, 타단은 프리폼(24)과 결합되는 프리폼로드(20);로 구성되는 것을 특징으로 하는 소결용 커플러 결합장치에 의하여달성된다.An object of the present invention as described above, the lower surface is a hollow shape, the coupler 30 is formed with a pinhole 32 penetrating the central portion to the side; A rotary shaft rod 10 integrally coupled with an upper end of the coupler 30; And a ring 22 having one end coupled to the pinhole 32 by a pin 36, and the other end having a preform rod 20 coupled with the preform 24. Achieved by a sinter coupler coupling device.
본 발명에서는 상기 프리폼로드(20)와 상기 회전축로드(10)를 상호 연결할 수 있는 특별한 형상의 석영 재질의 커플러(30)를 사용함으로써 종래의 문제점을 해결하고자 한다.In the present invention, to solve the conventional problems by using a coupler 30 of a quartz material of a special shape that can interconnect the preform rod 20 and the rotary shaft rod 10.
본 발명에서 제안하는 커플러(30)는 핀타입의 지지대와 커플러본체가 체결되는 방식의 부분적인 보강으로 허용하중을 크게 강화할 수 있어 대형프리폼의 제작에 효과적으로 적용할 수 있도록 하고자 한다.Coupler 30 proposed in the present invention is to reinforce the allowable load by a partial reinforcement of the method of fastening the pin-type support and the coupler body is to be effectively applied to the production of large preforms.
본 발명의 그 밖의 목적, 특정한 장점 및 신규한 특징들은 이하의 발명의 상세한 설명과 바람직한 실시예로부터 더욱 분명해질 것이다.Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description of the invention and the preferred embodiments.
도 1은 본 발명의 일 실시예에 따른 소결용 커플러 결합장치의 사시도이다.1 is a perspective view of a sintering coupler coupling device according to an embodiment of the present invention.
도 2는 도 1의 소결용 커플러 결합장치의 분해사시도이다.2 is an exploded perspective view of the coupler coupling device for sintering of FIG.
* 도면의 주요 부분에 대한 부호 설명* Explanation of symbols on the main parts of the drawing
10 : 회전축로드10: rotating shaft rod
20 : 프리폼로드20: preform rod
22 : 링22: ring
24 : 프리폼24: preform
30 : 커플러30: coupler
32 : 핀홀32: pinhole
34 : 개구부34 opening
36 : 핀36: pin
이하 본 발명에 따른 소결용 커플러 결합장치의 구성에 대하여 설명하기로 한다.Hereinafter, the configuration of the coupler coupling device for sintering according to the present invention will be described.
도 1은 본 발명의 일 실시예에 따른 소결용 커플러 결합장치의 사시도이다. 도 1에 도시된 바와 같이, 상기 소결용 커플러 결합장치는 회전축로드(10), 프리폼로드(20) 및 상기 회전축로드(10)와 상기 프리폼로드(20)를 연결하는 커플러(30)로 구성되어 있다.1 is a perspective view of a sintering coupler coupling device according to an embodiment of the present invention. As shown in FIG. 1, the sintering coupler coupling device includes a rotation shaft rod 10, a preform rod 20, and a coupler 30 connecting the rotation shaft rod 10 and the preform rod 20. have.
도 2는 도 1의 소결용 커플러 결합장치의 분해사시도이다. 도 2에 도시된 바와 같이, 상기 프리폼로드(20)의 일단은 오링(O-ring) 모양의 링(22)이 형성되어 있고, 타단은 프리폼(24)과 결합되어 있다. 상기 회전축로드(10)의 끝단부는 커플러(30)의 상단부와 결합되어 있다.2 is an exploded perspective view of the coupler coupling device for sintering of FIG. As shown in FIG. 2, one end of the preform rod 20 is formed with an O-ring-shaped ring 22, and the other end is coupled to the preform 24. The end of the rotary shaft rod 10 is coupled to the upper end of the coupler 30.
상기 커플러(30)는 상기 회전축로드(10)와 상기 프리폼로드(20) 연결하는 장치인 바, 하단부가 개구된 중공의 형상이며, 도 1에서는 원통형의 형상으로 도시하였다. 상기 커플러(30)의 측면부에는 중심부를 관통하는 핀홀(32)이 형성되어 있으며 상기 핀홀(32)과 상기 링(22)은 대응되어 결합되는 바, 결합수단은 원기둥 형상의 핀(36)으로 결합된다.The coupler 30 is a device for connecting the rotary shaft rod 10 and the preform rod 20, and has a hollow shape having a lower end thereof, and is illustrated in a cylindrical shape in FIG. 1. The side of the coupler 30 has a pinhole 32 penetrating through the center and the pinhole 32 and the ring 22 are correspondingly coupled, the coupling means is coupled to the cylindrical pin 36 do.
이하 상기와 같은 구성을 갖는 본 발명에 따른 소결용 커플러 결합장치의 결합 및 작용에 대하여 설명하기로 한다.Hereinafter, the coupling and action of the sinter coupler coupling device according to the present invention having the configuration as described above will be described.
본 발명에 따른 커플러 결합장치는 핀타입의 체결수단을 적용하였는 바, 이는 구조적인 특성상 프리폼(30)의 허용하중을 크게 증가시키더라도 중력에 의한 자동정렬이 가능하도록 하여 프리폼이 휘어지는 것을 방지하는 작용을 한다.Coupler coupling device according to the present invention was applied to the pin-type fastening means, which is a structural feature to prevent the preform is bent by enabling the automatic alignment by gravity even if the allowable load of the preform 30 is greatly increased Do it.
또한, 본 발명에 따른 소결용 커플러 장치에 의하면 상기 커플러(30)는 상기 회전축로드(10) 및 프리폼로드(20)와 동일한 재질을 사용하였는 바, 본 발명에서는 범용되는 석영재질을 사용함으로써 상호간에 기계적 강도 및 열팽창계수의 차이가 없도록 하여, 이는 정렬이상으로 발생할 수 있는 소결장치의 파손현상을 방지할 수 있는 역할을 한다.In addition, according to the sintering coupler device according to the present invention, the coupler 30 is the same material as the rotary shaft rod 10 and the preform rod 20, in the present invention by using a common quartz material mutually Since there is no difference in mechanical strength and coefficient of thermal expansion, this serves to prevent breakage of the sintering apparatus that may occur due to misalignment.
또한, 상기 회전축로드(10)와 상기 커플러(30)의 결합부위는 축방향에서 볼 때 플러스형(+)으로 체결되어 플러스형의 중심부의 설계에 따라 상기 프리폼로드(20)의 자동 축중심 정렬이 가능하다.In addition, the coupling portion of the rotary shaft rod 10 and the coupler 30 is fastened to the positive type (+) when viewed in the axial direction, the automatic shaft center alignment of the preform rod 20 according to the design of the center of the positive type This is possible.
그리고, 상기 링(22)과 상기 핀(36) 사이에는 약간의 틈이 있어서 이는 상기 프리폼로드(20)가 중력 방향으로 쉽게 정렬이 가능하도록 하며, 상기 링(22)의 상기 핀(36)과 접촉하는 부위는 유자형(U)으로 형성되어 있어 이 역시 상기 프리폼로드(20)가 중력방향으로 쉽게 정렬이 가능하도록 한다.In addition, there is a slight gap between the ring 22 and the pin 36 so that the preform rod 20 can be easily aligned in the direction of gravity, and with the pin 36 of the ring 22. The contact portion is formed in the U-shaped (U), which also allows the preform rod 20 to be easily aligned in the direction of gravity.
상기 언급한 바와 같은 본 발명에 따른 소결용 커플러 결합장치에 의하면, 종래의 축정렬 문제에서 발생하는 스트레인를 쉽게 해결할 수 있을 뿐만 아니라 프리폼로드에 핀홀을 뚫는 과정에서 발생하기 쉬운 기계적 강도저하 문제를 함께 해결할 수 있으며 결과적으로 소결된 프리폼이 소결과정에서 한쪽 방향으로 휘어지는 등의 불량소결을 방지할 수 있는 효과가 있다.According to the coupler coupling device for sintering according to the present invention as described above, not only can easily solve the strain caused by the conventional shaft alignment problem, but also solve the problem of mechanical strength degradation which is easy to occur in the process of drilling a pinhole in the preform rod. As a result, the sintered preform is effective in preventing bad sintering such as bending in one direction during the sintering process.
또한, 본 발명에 따른 소결용 커플러 결합장치는 구조적인 특성상 허용하중을 크게 증가시키는 것이 가능하여 결과적으로 대형 프리폼을 커플링 시키는 것이 가능할 뿐만 아니라 중력에 의한 자동정렬이 가능하여 효과적으로 소결작업을 수행할 수 있다.In addition, the coupler coupling device for sintering according to the present invention can significantly increase the allowable load due to its structural characteristics, and as a result, it is possible not only to couple large preforms, but also to automatically align by gravity to perform sintering work effectively. Can be.
비록 본 발명이 상기 언급된 바람직한 실시예와 관련하여 설명되어졌지만, 발명의 요지와 범위로부터 벗어남이 없이 다양한 수정이나 변형을 하는 것이 가능하다. 따라서 첨부된 특허청구범위는 본 발명의 요지에 속하는 이러한 수정이나 변형을 포함한다.Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims include such modifications and variations as fall within the spirit of the invention.
Claims (7)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020020016848A KR20030077881A (en) | 2002-03-27 | 2002-03-27 | A combination device of coupler for sintering |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020020016848A KR20030077881A (en) | 2002-03-27 | 2002-03-27 | A combination device of coupler for sintering |
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| KR20030077881A true KR20030077881A (en) | 2003-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0543255A (en) * | 1991-08-07 | 1993-02-23 | Sumitomo Electric Ind Ltd | Production of glass preform |
| JPH05193957A (en) * | 1991-06-19 | 1993-08-03 | Sumitomo Electric Ind Ltd | Device for supporting glass article |
| JPH06247735A (en) * | 1993-02-22 | 1994-09-06 | Sumitomo Electric Ind Ltd | Method for flame polishing glass preform |
| JPH06298540A (en) * | 1993-04-12 | 1994-10-25 | Fujikura Ltd | Production of optical fiber preform |
| JP2000007368A (en) * | 1998-06-23 | 2000-01-11 | Fujikura Ltd | Connection of rods and production of preform for optical fiber |
-
2002
- 2002-03-27 KR KR1020020016848A patent/KR20030077881A/en not_active Application Discontinuation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05193957A (en) * | 1991-06-19 | 1993-08-03 | Sumitomo Electric Ind Ltd | Device for supporting glass article |
| JPH0543255A (en) * | 1991-08-07 | 1993-02-23 | Sumitomo Electric Ind Ltd | Production of glass preform |
| JPH06247735A (en) * | 1993-02-22 | 1994-09-06 | Sumitomo Electric Ind Ltd | Method for flame polishing glass preform |
| JPH06298540A (en) * | 1993-04-12 | 1994-10-25 | Fujikura Ltd | Production of optical fiber preform |
| JP2000007368A (en) * | 1998-06-23 | 2000-01-11 | Fujikura Ltd | Connection of rods and production of preform for optical fiber |
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