WO2002051759A2 - Verfahren und vorrichtung zur herstellung eines hohlzylinders aus quarzglas und danach hergestellte produkte - Google Patents
Verfahren und vorrichtung zur herstellung eines hohlzylinders aus quarzglas und danach hergestellte produkte Download PDFInfo
- Publication number
- WO2002051759A2 WO2002051759A2 PCT/EP2001/014997 EP0114997W WO02051759A2 WO 2002051759 A2 WO2002051759 A2 WO 2002051759A2 EP 0114997 W EP0114997 W EP 0114997W WO 02051759 A2 WO02051759 A2 WO 02051759A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- inner bore
- suspension
- blank
- carrier
- quartz glass
- Prior art date
Links
Classifications
-
- 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]
- C03B37/01486—Means for supporting, rotating or translating the preforms being formed, e.g. lathes
- C03B37/01493—Deposition substrates, e.g. targets, mandrels, start rods or tubes
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/14—Other methods of shaping glass by gas- or vapour- phase reaction processes
- C03B19/1484—Means for supporting, rotating or translating the article being formed
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/14—Other methods of shaping glass by gas- or vapour- phase reaction processes
- C03B19/1484—Means for supporting, rotating or translating the article being formed
- C03B19/1492—Deposition substrates, e.g. targets
-
- 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]
- C03B37/01486—Means for supporting, rotating or translating the preforms being formed, e.g. lathes
Definitions
- the invention relates to a method for producing a hollow cylinder made of quartz glass, comprising depositing SiO 2 particles on an elongate support rotating about its longitudinal axis, forming a porous blank with a cylindrical inner bore, and vitrifying the blank hanging in a furnace in a vertical orientation using a suspension that engages a constriction provided in the upper area of the inner bore of the blank.
- the invention further relates to a quartz glass tube and an optical component made of quartz glass, comprising a light-guiding structure which is formed by a coaxial succession of quartz glass layers of different refractive indices.
- the invention relates to a device for carrying out the method, with a substantially cylindrical support rotatable about its longitudinal axis, on the cylinder surface of which SiO 2 particles are deposited to form a porous blank having an inner bore, and with a suspension engaging in the inner bore for holding the blank in a vertical orientation during a glazing step.
- Preforms for optical fibers are often produced via an intermediate product in the form of a porous blank made of silicon dioxide carbon black (hereinafter also referred to as “blank” or “soot cylinder”).
- the further processing of the soot cylinder comprises a glazing step in which the soot cylinder is heated in a hanging manner in a glazing furnace and is thereby glazed to form a dense quartz glass tube.
- a variety of measures have been proposed for holding the soot cylinder during the glazing step.
- the holder In the method known from US-A 4,252,251, the holder consists of a platinum wire which extends through a radial through-hole in the upper region of the soot body and on which the soot body is suspended.
- DE-A1 29 06 070 proposes a holder in which a quartz glass tube is inserted from above into the cylindrical inner bore and has bump-like thickenings at its lower end intended for insertion into the soot cylinder. To anchor the quartz glass tube in the inner bore, the thickenings are rotated by 90 ° so that they dig into the soft soot material.
- a holder in which a sleeve is stably embedded over part of its length in one end of the soot body during the deposition of the SiO 2 particles.
- the carrier extends through the sleeve, wherein it is geometrically fixed by means of spacers which are clamped in the gap between the sleeve and the carrier.
- the sleeve and carrier consist, for example, of aluminum oxide, graphite or quartz glass.
- a method and a device of the type mentioned at the outset are known from EP-A 701 975.
- a method for sintering a soot cylinder with a cylindrical IB is proposed, in which it is fed to a heating zone standing in a vertical orientation on a holding foot and is sintered therein in regions. It extends through the inner bore of the soot cylinder Support tube made of porous graphite, onto which the soot cylinder shrinks during glazing.
- a special feature of the known method is that the soot cylinder hangs itself up during sintering.
- Attaching the support ring in the inner bore of the soot cylinder can lead to undesirable abrasion. Contamination from the graphite of the support tube can get into the soot cylinder, in particular through the direct contact between the support ring and the inner bore of the soot cylinder.
- optical preforms After the known soot cylinders have been vitrified, they are used to produce optical preforms. As is known, these have a light-guiding structure which is formed by a coaxial succession of quartz glass layers of different refractive indices. Optical fibers are drawn from the preforms. Their optical attenuation is significantly influenced by the impurity content of the quartz glass of the preforms, in particular impurities in the light-guiding area.
- the invention is based on the object of improving the methods mentioned at the outset such that even heavy blanks can be held safely and largely without the risk of contamination of the inner bore during glazing without complicated holding devices, and a suitable holding device for this purpose. Furthermore, the invention is based on the object of specifying a hollow cylinder made of quartz glass with a high-purity inner bore and of providing an optical component made of quartz glass which is distinguished by a low impurity content.
- this object is achieved according to the invention based on the method mentioned at the outset in that the constriction is produced by shaping the inner bore when the Si0 2 particles are separated, and that for the glazing, a suspension that is supported on the constriction and otherwise projects contact-free into the inner bore is used.
- the inner bore is narrowed during the deposition process by the design of the inner bore. Subsequent processing of the porous blank for fastening a holding element and the abrasion that is always associated therewith is avoided. Because a narrowing of the inner bore is produced when it is formed, it is also not necessary to embed a holding element - as explained above with regard to the prior art. This is justified in the following.
- the constriction created when the inner bore is formed serves as an abutment for a suspension when the blank is glazed. This is only inserted into the inner bore for glazing.
- the suspension projects into the inner bore in such a way that the constriction previously generated during the deposition process is supported on the suspension. This ensures a secure hold of the blank without a holding element being embedded in or attached to the blank.
- the suspension projects into the inner bore without contact during glazing. This results in a tool-free shaped inner bore after glazing.
- This tool-free molding results in an inner wall of high quality with a smooth, damage-free inner surface that forms, which is also characterized by a low level of contamination.
- the constriction is preferably produced by the fact that when the SiO 2 particles are deposited, a carrier is used which, seen over its length, has a reduction in its outer diameter in a tapered area, the deposition of the SiO 2 particles also comprising a deposition in the tapered area.
- the reduction in the outside diameter in the tapered area causes
- the reduction in the outside diameter is a gradual tapering of the outside diameter of the carrier or a gradual reduction.
- the reduction in the outer diameter is rotationally symmetrical, symmetrical or asymmetrical with respect to the longitudinal axis of the carrier. It can consist, for example, of a one-sided flattening of the carrier jacket surface. It is only essential that undercuts are avoided, which would make it difficult to pull out the carrier after the deposition process.
- One or more tapered areas are provided. The Si0 2 particles are also deposited in the tapered area, so that the blank that is formed covers at least one reduction in the carrier outer diameter.
- a reduction in the outer diameter, which comprises a circumferential shoulder, is particularly suitable.
- the narrowing of the inner bore has a corresponding radially circumferential shoulder.
- the suspension projects into the inner bore from above, so that it engages under the constriction. Because the suspension engages in the inner bore from above, a holding device within the inner bore, such as the “support tube” used in the generic method, is largely unnecessary.
- the inner bore has a stepwise diameter narrowing
- the suspension - similar to a spool of thread - comprising a holding foot, the outer diameter of which is smaller than the inner diameter of the inner bore but larger than the inner diameter in Area of the narrowing of the diameter, and which is connected to a rod-shaped holder, the outer diameter of which is smaller than the inner diameter in the area of the narrowing of the diameter.
- a further improvement of the method according to the invention is achieved in that at least part of the suspension consists of quartz glass. Those parts of the suspension in the immediate vicinity of the blank are advantageously made of quartz glass.
- the object specified above is achieved according to the invention in that after the glazing it has a cylindrical inner bore shaped without tools.
- the cylindrical inner bore of the hollow cylinder receives its shape during glazing using the method described above.
- the inner bore is obtained by tool-free shaping.
- a tool-free shaping means that during glazing, contact of the wall with a component located inside the inner bore - such as a holding rod - is avoided, so that a high-quality inner wall with a smooth, damage-free inner surface is formed, which is also characterized by a low level of contamination.
- the hollow cylinder obtained in this way is suitable for producing so-called “substrate tubes”. These are used to produce optical preforms by internally depositing core material on the inner wall of the substrate tube (“MCVD method” or “PCVD method”).
- the hollow cylinder is also suitable in the form of a so-called "jacket tube” for overlaying core rods for the purpose of applying additional jacket material.
- the task specified above becomes solved according to the invention in that at least part of the quartz glass layers is produced from a hollow cylinder according to the invention.
- the optical component is a so-called core rod, an optical preform or an optical fiber. Since at least some of the quartz glass layers of the optical component are produced from the quartz glass tube according to the invention, it is characterized by a low impurity content.
- the optical fibers drawn from a preform according to the invention or obtained using a core rod according to the invention therefore show little optical attenuation.
- the above-mentioned object is achieved according to the invention starting from the device mentioned at the outset in that the carrier has a first, larger outside diameter over a first part length and a second, smaller outside diameter over a second part length, and in that the suspension has an elongated handle , which is connected to a thickening, wherein the diameter of the enveloping circle around the outer cross section of the handle - seen in the longitudinal direction - is smaller than the second outer diameter, and wherein the diameter of the enveloping circle around the outer cross section of the thickening - seen in the longitudinal direction - smaller than the first outer diameter and larger than the second outer diameter.
- the device according to the invention results only from the coordinated shaping of two separate components, namely on the one hand the carrier on which Si0 2 particles are deposited to form a blank, and on the other hand the suspension which engages in the inner bore of the blank during glazing.
- the outer shape of the carrier gives the blank an inner bore which has a larger diameter over a first partial length and a smaller diameter over a second partial length, the transition between the larger and the smaller diameter being referred to as "narrowing", as described above with reference to the invention This narrowing, in turn, serves as an abutment for the suspension.
- the suspension has a handle which, due to the partial length of the inner bore, also has a handle fits through the smaller diameter, and which is connected with a thickening, which fits through the part length of the inner bore with the larger, but not through that part length of the inner bore with the smaller diameter.
- the blank can be held in a vertical orientation by means of the suspension, the thickening of the suspension engaging under the constriction of the inner bore.
- the carrier has a circumferential shoulder between the first part length and the second part length, and the suspension between the handle and the thickening.
- Such a heel is particularly easy to manufacture and it ensures reproducible mounting of the blank when glazing in a vertical orientation.
- Figure 1 shows the process step of depositing a porous blank
- Figure 2 shows the process step of glazing the blank.
- Figure 1 shows schematically the step of depositing a porous blank 1 using a step-shaped carrier tube 3.
- the blank 1 is here by means of the known flame hydrolysis method by external deposition of Si0 2 particles on the carrier tube 3 rotating about its longitudinal axis 2 by means of one or more along the surface of the forming blank 1 moving separating burner (not shown in FIG. 1).
- the carrier tube 3 has the first, larger length section 4 and a second, shorter length section 5.
- the outer diameter in the length section 4 of 60 mm is reduced in a circumferential step 6 to an outer diameter of 54 mm in the length section 5 of the carrier tube 3.
- the carrier tube 3 is removed by placing it in Direction of the length section 4 is pulled out of the blank 1.
- the blank 1 produced in this way has an inner bore 7 which essentially has an inner diameter of 60 mm, but which is reduced by 6 mm over a length of 10 cm in the region of the length section 5b (see FIG. 2).
- the circumferential shoulder generated by the step 6 in the inner bore of the blank 1 is designated in FIG. 2 by the reference number 6b.
- the process step of glazing the blank 1 is shown schematically.
- the blank 1 obtained after the deposition process described above and having a step-shaped inner bore 7 is heated in zones in a vertical orientation - starting with the upper end - in a glazing furnace.
- the blank 1 is held by means of a suspension 8, which consists of a rod 9 made of quartz glass, which is welded centrally to a circular quartz glass plate 10.
- the outer diameter of the quartz glass plate 10 is approximately 59 mm; that of the quartz glass rod 9 about 30 mm.
- the suspension 8 is inserted from below into the blank 1 and pulled up to the stop at paragraph 6b.
- the quartz glass rod 9 has a length of 50 cm, so that it extends through the entire length section 5b and protrudes from the upper end 11 of the blank 1. Since the quartz glass plate 10 engages under the shoulder 6b, the blank 1 can be held securely by means of the suspension 8.
- the step 6b produced during the shaping of the inner bore 7 serves as an abutment for the suspension 8 when the blank 1 is glazed.
- a quartz glass hollow cylinder is obtained from the blank 1 by glazing.
- part of the suspension 8 (quartz glass plate 10 and part of the quartz glass rod 9) is fused to the blank 1, so that a firm and intimate connection between the blank 1 and the suspension 8 is ensured. Since the suspension 8 has no mechanical contact with the cylindrical surface of the inner bore 7, a tool-free shaped inner wall with a high surface quality is obtained after the glazing.
- a transition region is provided in a further exemplary embodiment, in which the outer diameter of the carrier tube 3 tapers from the longitudinal section 4 from an outer diameter of 60 mm to the longitudinal section 5 with an outer diameter of 54 mm rejuvenated.
- the blank formed by means of this carrier accordingly has an inner cone.
- a holding element is inserted from below, which has an outer cone corresponding to the inner cone.
- the quartz glass hollow cylinder produced in this way is suitable for use as a "jacket tube” for covering a core rod with quartz glass jacket material, or it is further processed into a so-called “substrate tube” for use in the production of optical preforms for optical fibers according to the so-called MCVD process ,
- the preforms and optical fibers produced using the hollow cylinder according to the invention are notable for low optical attenuation.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002552864A JP4236090B2 (ja) | 2000-12-22 | 2001-12-18 | 石英ガラスから中空円筒を製造する方法、及びその製造方法を行うための装置 |
US10/451,453 US7387000B2 (en) | 2000-12-22 | 2001-12-18 | Method of producing a hollow glass cylinder with suspension during sintering |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10064730A DE10064730B4 (de) | 2000-12-22 | 2000-12-22 | Verfahren zur Herstellung eines Hohlzylinders aus Quarzglas |
DE10064730.8 | 2000-12-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002051759A2 true WO2002051759A2 (de) | 2002-07-04 |
WO2002051759A3 WO2002051759A3 (de) | 2003-01-30 |
Family
ID=7668777
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/014997 WO2002051759A2 (de) | 2000-12-22 | 2001-12-18 | Verfahren und vorrichtung zur herstellung eines hohlzylinders aus quarzglas und danach hergestellte produkte |
Country Status (5)
Country | Link |
---|---|
US (1) | US7387000B2 (de) |
JP (1) | JP4236090B2 (de) |
CN (1) | CN1212987C (de) |
DE (1) | DE10064730B4 (de) |
WO (1) | WO2002051759A2 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004014345B4 (de) * | 2004-03-22 | 2007-09-20 | Heraeus Tenevo Gmbh | Verfahren zur Herstellung eines optischen Bauteils |
DE102007029506B4 (de) * | 2007-06-25 | 2009-04-02 | Heraeus Quarzglas Gmbh & Co. Kg | Verfahren zur Herstellung eines Zylinders aus Quarzglas unter Einsatz einer Haltevorrichtung sowie geeignete Haltevorrichtung zur Durchführung des Verfahrens |
DE102008029756B3 (de) * | 2008-06-25 | 2009-04-30 | Heraeus Quarzglas Gmbh & Co. Kg | Verfahren zur Herstellung eines Zylinders aus Quarzglas sowie Haltevorrichtung zur Durchführung des Verfahrens |
JP5173660B2 (ja) * | 2008-08-04 | 2013-04-03 | 株式会社フジクラ | 光ファイバ用母材の製造方法 |
EP3702333A1 (de) * | 2019-03-01 | 2020-09-02 | Heraeus Quarzglas GmbH & Co. KG | Verfahren und vorrichtung zur herstellung eines glasbauteils |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3620704A (en) * | 1969-12-18 | 1971-11-16 | Texas Instruments Inc | Method and apparatus for forming and drawing fused metal-oxide tubes |
US4157906A (en) * | 1978-02-21 | 1979-06-12 | Corning Glass Works | Method of drawing glass optical waveguides |
US4362545A (en) * | 1980-07-03 | 1982-12-07 | Corning Glass Works | Support member for an optical waveguide preform |
EP0252486A2 (de) * | 1986-07-10 | 1988-01-13 | Kabelmetal Electro GmbH | Verfahren zur Herstellung von Lichtwellenleitern |
EP0701975A2 (de) * | 1994-09-15 | 1996-03-20 | Heraeus Quarzglas GmbH | Verfahren zum Sintern von Hohlzylindern aus Siliciumdioxid - Soot und Haltevorrichtung für derartige Hohlzylinder |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3806570A (en) * | 1972-03-30 | 1974-04-23 | Corning Glass Works | Method for producing high quality fused silica |
US4251251A (en) * | 1979-05-31 | 1981-02-17 | Corning Glass Works | Method of making optical devices |
JPS62256733A (ja) * | 1986-04-30 | 1987-11-09 | Hitachi Cable Ltd | 合成石英管の製造方法 |
US5149349A (en) * | 1991-07-11 | 1992-09-22 | Corning Incorporated | Method of making polarization retaining fiber with an elliptical core, with collapsed apertures |
JPH0648757A (ja) * | 1992-07-27 | 1994-02-22 | Furukawa Electric Co Ltd:The | 光ファイバ用母材の製造方法 |
JP3406107B2 (ja) * | 1995-01-31 | 2003-05-12 | 信越石英株式会社 | 石英ガラスの製造方法 |
DE19649935C2 (de) * | 1996-12-02 | 1999-09-16 | Heraeus Quarzglas | Verfahren zur Herstellung von Quarzglaskörpern |
-
2000
- 2000-12-22 DE DE10064730A patent/DE10064730B4/de not_active Expired - Fee Related
-
2001
- 2001-12-18 CN CN01821190.9A patent/CN1212987C/zh not_active Expired - Fee Related
- 2001-12-18 JP JP2002552864A patent/JP4236090B2/ja not_active Expired - Fee Related
- 2001-12-18 WO PCT/EP2001/014997 patent/WO2002051759A2/de active Application Filing
- 2001-12-18 US US10/451,453 patent/US7387000B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3620704A (en) * | 1969-12-18 | 1971-11-16 | Texas Instruments Inc | Method and apparatus for forming and drawing fused metal-oxide tubes |
US4157906A (en) * | 1978-02-21 | 1979-06-12 | Corning Glass Works | Method of drawing glass optical waveguides |
US4362545A (en) * | 1980-07-03 | 1982-12-07 | Corning Glass Works | Support member for an optical waveguide preform |
EP0252486A2 (de) * | 1986-07-10 | 1988-01-13 | Kabelmetal Electro GmbH | Verfahren zur Herstellung von Lichtwellenleitern |
EP0701975A2 (de) * | 1994-09-15 | 1996-03-20 | Heraeus Quarzglas GmbH | Verfahren zum Sintern von Hohlzylindern aus Siliciumdioxid - Soot und Haltevorrichtung für derartige Hohlzylinder |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 12, no. 139, 27. April 1988 (1988-04-27) & JP 62 256733 A (HITACHI CABLE LTD), 9. November 1987 (1987-11-09) * |
PATENT ABSTRACTS OF JAPAN vol. 18, no. 276, 26. Mai 1994 (1994-05-26) & JP 06 048757 A (FURUKAWA ELECTRIC CO LTD), 22. Februar 1994 (1994-02-22) * |
Also Published As
Publication number | Publication date |
---|---|
DE10064730B4 (de) | 2004-07-29 |
JP4236090B2 (ja) | 2009-03-11 |
DE10064730A1 (de) | 2002-07-11 |
US7387000B2 (en) | 2008-06-17 |
CN1483005A (zh) | 2004-03-17 |
JP2004516221A (ja) | 2004-06-03 |
WO2002051759A3 (de) | 2003-01-30 |
CN1212987C (zh) | 2005-08-03 |
US20040065121A1 (en) | 2004-04-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2906070C2 (de) | Verfahren zum Herstellen von optischen Wellenleitern | |
DE102006059779B4 (de) | Verfahren für die Herstellung eines Hohlzylinders aus synthetischem Quarzglas, nach dem Verfahren erhaltener dickwandiger Hohlzylinder und Verfahren zur Herstellung einer Vorform für optische Fasern | |
DE2850969C2 (de) | ||
WO2010003856A1 (de) | Biegeunempfindliche optische faser, quarzglasrohr als halbzeug für seine herstellung sowie verfahren zur herstellung der faser | |
DE19649935A1 (de) | Verfahren zur Herstellung von Quarzglaskörpern | |
DE10152328B4 (de) | Verfahren zur Herstellung eines Rohres aus Quarzglas, rohrförmiges Halbzeug aus porösem Quarzglas u. Verwendung desselben | |
WO2005009912A1 (de) | Verfahren zur herstellung eines optischen bauteils aus quarzglas sowie hohlzylinder aus quarzglas zur durchführung des verfahrens | |
WO2001090010A1 (de) | Verfahren für die herstellung einer optischen faser und vorform für eine optische faser | |
DE2625010B2 (de) | Verfahren zur Herstellung eines Vorformlings für optische Fasern | |
WO2005121037A1 (de) | Verfahren zur herstellung eines optischen bauteils aus quarzglas | |
WO2005095294A2 (de) | Verfahren zur herstellung eines optischen bauteils | |
DE60314377T2 (de) | Verfahren zur herstellung von lichtleitfaser und lichtleitfaser | |
DE102004039645B3 (de) | Verfahren zur Herstellung eines optischen Bauteils aus Quarzglas sowie zur Durchführung des Verfahrens geeignetes Vorprodukt | |
EP0623563B1 (de) | Vorrichtung und Verfahren zum Erhitzen eines langgestreckten Glaskörpers | |
WO2002051759A2 (de) | Verfahren und vorrichtung zur herstellung eines hohlzylinders aus quarzglas und danach hergestellte produkte | |
DE10303290B3 (de) | Verfahren zur Herstellung eines Hohlzylinders aus synthetischem Quarzglas unter Einsatz einer Haltevorrichtung sowie geeignete Haltevorrichtung zur Durchführung des Verfahrens | |
DE19736949C1 (de) | Verfahren zur Herstellung eines Quarzglaskörpers | |
EP2545009B1 (de) | Verfahren sowie rohrförmiges halbzeug zur herstellung einer optischen faser | |
WO2001040126A1 (de) | Quarzglas-vorform für eine lichtleitfaser und verfahren zu ihrer herstellung | |
DE102007029506B4 (de) | Verfahren zur Herstellung eines Zylinders aus Quarzglas unter Einsatz einer Haltevorrichtung sowie geeignete Haltevorrichtung zur Durchführung des Verfahrens | |
DE102008029756B3 (de) | Verfahren zur Herstellung eines Zylinders aus Quarzglas sowie Haltevorrichtung zur Durchführung des Verfahrens | |
DE10012227C1 (de) | Verfahren zur Herstellung eines Quarzglaskörpers | |
DE19958289C1 (de) | Verfahren zur Herstellung eines Quarzglasstabs und Verwendung desselben zur Herstellung einer Vorform | |
EP0163071B1 (de) | Verfahren zum Herstellen einer Vorform zum Ziehen von Lichtleitfasern | |
EP0163072B1 (de) | Verfahren zum Herstellen einer Vorform zum Ziehen von Lichtleitfasern |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): CN JP SG US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
AK | Designated states |
Kind code of ref document: A3 Designated state(s): CN JP SG US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A3 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2002552864 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 018211909 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10451453 Country of ref document: US |
|
122 | Ep: pct application non-entry in european phase |