WO2005009913A1 - Verfahren zur herstellung eines optischen bauteils aus quarzglas - Google Patents
Verfahren zur herstellung eines optischen bauteils aus quarzglas Download PDFInfo
- Publication number
- WO2005009913A1 WO2005009913A1 PCT/EP2004/008033 EP2004008033W WO2005009913A1 WO 2005009913 A1 WO2005009913 A1 WO 2005009913A1 EP 2004008033 W EP2004008033 W EP 2004008033W WO 2005009913 A1 WO2005009913 A1 WO 2005009913A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hollow cylinder
- core rod
- inner bore
- cylinder
- optical component
- Prior art date
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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
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
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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
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
- C03B37/01245—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down by drawing and collapsing
-
- 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
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/01251—Reshaping the ends
-
- 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
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/0126—Means for supporting, rotating, translating the rod, tube or preform
-
- 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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
- C03B37/02736—Means for supporting, rotating or feeding the tubes, rods, fibres or filaments to be drawn, e.g. fibre draw towers, preform alignment, butt-joining preforms or dummy parts during feeding
-
- 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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
- C03B37/02754—Solid fibres drawn from hollow preforms
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/12—Drawing solid optical fibre directly from a hollow preform
- C03B2205/14—Drawing solid optical fibre directly from a hollow preform comprising collapse of an outer tube onto an inner central solid preform rod
Definitions
- the present invention relates to a method for producing an optical component made of quartz glass by elongating a coaxial arrangement of a core rod and a hollow cylinder of a predetermined length, by feeding the arrangement in vertical orientation to a heating zone, softening it zone by zone starting with its lower end and from the softened area the component is pulled down, the hollow cylinder having an inner bore which is provided in the region of its lower end with a constriction on which the core rod rests.
- ODD process overclad during drawing. All process variants require an exactly coaxial guidance or fixation of the core rod in the hollow cylinder.
- No. 4,812,154 A1 proposes a method for producing a preform, in which a constriction is produced in the lower region of the casing tube with an inner diameter that is smaller than the outer diameter of the core rod.
- the jacket tube is aligned vertically and a nitrogen stream is passed through the jacket tube from the lower side.
- the lower end of the core rod is inserted into the casing tube against the gas flow, the gas flow centering the core rod in the casing pipe, which prevents contact with the inner wall.
- the core rod and jacket tube are fused together to form a preform.
- the center bore of the retaining ring results in a stop for the core rod, which is provided with a conical lower end, while the first inner jacket tube rests on the retaining ring.
- the jacket tubes and the core rod are then fused together, a vacuum being created and maintained in the inner bore of the outer jacket tube.
- the invention is based on the object of specifying a further method for producing high-quality optical components by elongating a coaxial arrangement of the core rod and hollow cylinder, in which the hollow cylinder is provided with a constriction for the purpose of fixing the core rod, which constriction can be produced inexpensively, and which with as much as possible low effort allows a reproducible fixation of the core rod in the hollow cylinder.
- this object is achieved according to the invention in that the constriction of the inner bore is produced in a first upper hollow cylinder, a) by the end face of the first, upper cylinder being fused with a second, lower hollow cylinder to form an axial cylinder assembly , b) a core rod is inserted into the lower hollow cylinder, and the axial cylinder assembly, beginning with its lower end, is fed to the heating zone, is softened zone by zone and elongated to form the optical component, c) where a onion which progresses in the cylinder composite to the first, upper hollow cylinder forms within which the inner bore at least partially collapses and thereby causes the narrowing of the inner bore, d) that the first hollow cylinder at a parting plane in the region of the constriction from the optical component removed separated, and e) is then elongated together with a core rod in a coaxial arrangement to produce an optical component.
- the quartz glass component is manufactured by inserting a core rod into the inner bore of the lower hollow cylinder.
- the coaxial arrangement of core rod and hollow cylinder is softened zone by zone and elongated to a solid rod, a preform or a fiber.
- an optical component is drawn from the lower hollow cylinder with the core rod inserted therein, and at the same time the constriction for holding the core rod for the subsequent elongation process is generated on the upper hollow cylinder.
- the upper hollow cylinder is melted onto the upper side of the lower hollow cylinder before the first elongation process.
- Its inner bore is at least partially collapsible. In the inner hole of the lower one
- a hollow rod is used, which can also protrude into the inner bore of the upper hollow cylinder.
- the composite of the first, upper hollow cylinder and the second, lower hollow cylinder is fed to a heating zone in a vertical orientation and, beginning with its lower end, is softened zone by zone and elongated to form the optical component.
- the onion moves gradually in the direction of the upper hollow cylinder.
- its inner bore also begins to collapse, that is, the inner diameter tapers downward, so that the constriction forms.
- the upper, first hollow cylinder is separated from the withdrawn optical component or the rest of the same. Its inner bore is now completely or partially collapsed in the area of the parting plane and thus exhibits the desired narrowing for the storage of a core rod in a subsequent, second elongation process.
- the first hollow cylinder thus produced which has an inner bore with a constriction, is elongated in a coaxial arrangement with a core rod to form an optical component.
- the core rod is previously inserted through the upper opening of the inner bore of the hollow cylinder.
- the core rod is a quartz glass rod with a radially homogeneous or with a radially inhomogeneous refractive index distribution.
- the core rod consists of a core glass with a higher refractive index, which is surrounded by a cladding glass with a lower refractive index.
- the core rod is formed in one piece, or it is composed of several short core rod pieces, which are arranged one above the other in the inner bore of the hollow cylinder.
- the cladding glass is an integral part of the core rod, or it is provided in whole or in part in the form of one or more cladding glass tubes which surround a quartz glass rod.
- the core rod consists of a coaxial arrangement of a quartz glass rod and one or more cladding glass tubes; the outer diameter of the core rod in this case means the outer diameter of the outer cladding glass tube.
- the core rod is guided within the inner bore of the lower hollow cylinder and axially by means of the constriction formed therein fixed.
- the upper end of the core rod ends in the area of the connection between the upper and lower hollow cylinder or above.
- the two hollow cylinders are formed in one piece or composed of several sections.
- the optical component is a solid rod, a preform for the production of optical fibers or an optical fiber.
- the first hollow cylinder is preferably used in the second elongation process as a second hollow cylinder in the sense of the invention.
- an upper hollow cylinder is welded to its upper end face, in the inner bore of which the constriction for holding a core rod is produced in the course of the second elongation process.
- This process can be repeated any number of times. It is a quasi-continuous drawing process that includes at least two elongation processes.
- the core rod is held in the lower hollow cylinder in any way. In later elongation processes, it rests on a narrowing of the inner bore of the hollow cylinder, which was created in a previous elongation process.
- the upper hollow cylinder is preferably used in the elongation process to hold the lower hollow cylinder.
- the upper hollow cylinder has the holding function that is usually assigned to a so-called “dummy cylinder” made of low-quality quartz glass, on which the holding device engages and which is used to avoid material losses due to incomplete elongation of the hollow cylinder and the core rod inserted therein such a dummy cylinder is not required here.
- the remaining opening in the inner bore simplifies the cleaning of the hollow cylinder before the next elongation process and enables gas flushing at the beginning of the elongation process.
- the parting plane is selected in the area of the onion so that the inner bore of the separated hollow cylinder has the desired constriction on the one hand, but is not yet completely collapsed on the other hand.
- the inside diameter of the constriction is smaller than the outside diameter of the core rod resting on it in the subsequent elongation process.
- inner bore In the case of a core rod or holding rod used in the inner bore, there is still an open annular gap between the inner wall of the inner bore and the core rod / holding rod.
- inner bore In the following explanations, the term “inner bore” is to be understood such that such an “annular-gap-shaped inner bore” is also intended to be included, even if an “annular gap” is not expressly mentioned.
- the elongation process comprises a drawing phase and a drawing end phase, a vacuum being generated in the inner bore during the drawing phase in relation to the pressure applied to the outside.
- a vacuum is at least temporarily generated and maintained in the inner bore compared to the outside pressure.
- the negative pressure in the inner bore accelerates the collapse and generates additional, inwardly acting forces when collapsing, so that random fluctuations in other process parameters, which can lead to an undefined collapse process, are compensated for.
- a negative pressure in the inner bore contributes to the better reproducibility of the process.
- the pressure in the inner bore is increased in the final drawing phase.
- the negative pressure during the drawing phase can cause the inner bore to close completely even in a higher area of the drawing bulb, in particular with a small inner diameter or with a narrow annular gap.
- the parting plane - with the proviso that the inner bore is still open - should be selected in an upper area of the onion, with the result that a large part of the onion would be lost as a material and that the narrowing of the inner bore would be unusable due to the slight taper or mechanically weak.
- the inner bore is widened, so that a complete collapse of the inner bore is delayed.
- the parting line can be moved - as long as the inner bore is still open - to the lowest possible area of the onion, which reduces the material loss for the subsequent elongation process through better "tip shaping" and results in a more stable support for the core rod ,
- the above-mentioned upper limit of 50 mbar above the ambient pressure (in the furnace) is determined by the risk of the hollow cylinder inflating at even higher pressures.
- the stamp protrudes from above into the inner bore and presses on the core rod so that it prevents the core rod (or core rod pieces) from floating. This means an upward movement of the core rod against the direction of pull.
- the floating can occur when the
- Core rod has a low residual weight and clearance upwards. The effect leads to a relative lack of core rod material in the onion and thus accompanied by a change in the core / shell ratio "of the removed component.
- the stamp has an outside diameter that is smaller than the outside diameter of the core rod, so that an annular gap is established in the region of the stamp for the inner wall of the inner bore, which is wider than the annular gap in the region of the core rod.
- the upper end of the core rod preferably extends into the inner bore of the upper hollow cylinder.
- the resulting offset between the ends of the two hollow cylinders and the core rod enables a lower overall height of the furnace in the above-mentioned quasi-continuous mode of operation.
- the upper hollow cylinder is separated from the optical component in a shortened form as a "half cylinder", so that the composite of "half cylinder” and the new upper cylinder welded to it is shorter than two hollow cylinders of the same length. It is not necessary for the core rod or the hollow cylinder to have the same length; the method according to the invention also enables the use of remnants of these components.
- the upper end of the core rod extends to half the length of the upper hollow cylinder.
- a core rod is used which is approximately the same length as the upper hollow cylinder, whereas the lower hollow cylinder is shortened by half its length.
- the length of the drawing furnace required to carry out the elongation process can be shortened by half the length of a hollow cylinder.
- the elongation process ends as soon as the onion has reached the upper end of the core rod and a sufficient narrowing of the inner bore has formed above the core rod.
- the half hollow cylinder piece thus produced has at its lower end the constriction of the Inner bore and is used in the subsequent elongation process as a lower hollow cylinder by intermittently fusing it with a complete, upper hollow cylinder and fitting it with a core rod that extends to half of the upper hollow cylinder. This process is repeated any number of times.
- the chamfer counteracts the formation of internal or external beads when welding the upper and lower hollow cylinders.
- An inner bead would hinder the insertion of the core rod or any other casing tube; an outer bead undesirably influences the gas flow in the drawing furnace. It is sufficient if one of the two hollow cylinders to be welded has a corresponding chamfer in the area of the joint.
- the radial dimensions of the first and second hollow cylinders are ideally the same size. Acceptable results are achieved if the inside diameter of the upper hollow cylinder and the lower hollow cylinder deviate by a maximum of +/- 2 mm and the outer diameters of the upper hollow cylinder and the lower hollow cylinder by a maximum of +/- 3 mm.
- the first hollow cylinder can be a quartz glass tube with an inner bore produced without tools in the melt flow.
- the inner bore of the first, upper hollow cylinder is machined to the final dimension.
- a quartz glass blank with an outer diameter of more than 100 mm and a length of more than 2 m can be completely integrated into one using known grinding methods and suitable commercial devices straight hollow cylinder with a precise circular cross-section and a small dimensional deviation, in the range of 1/10 mm.
- a hollow cylinder mechanically machined to the final dimension in the sense of this invention is also to be understood as a cylinder whose inner surface has been mechanically machined to the final dimension and which is subsequently cleaned by etching. Uniform etching processes do not cause any significant change in the geometric final shape of the hollow cylinder (such as a bend or an ovality in the cross section).
- FIG. 1 shows a schematic illustration in detail in a schematic representation: a method step for producing a constriction at the end of a quartz glass hollow cylinder by elongating an axial composite of upper and lower hollow cylinder in a first embodiment
- FIG. 2 a method step for producing a constriction at the end of a quartz glass hollow cylinder by elongating an axial composite of upper and lower hollow cylinders in a second embodiment
- Figure 3 a hollow cylinder suitable for producing the composite according to Figures 1 and 2 in a longitudinal section
- Figure 4 Views of the onion to show different variants of the collapsing process of the inner bore and the selection of a suitable parting plane.
- the hollow cylinders described in more detail below are used for the production of optical fibers, each of which has a core area which is surrounded by an inner cladding glass layer and an outer cladding glass layer.
- the core area consists of quartz glass, which is homogeneously doped with 5% by weight germanium dioxide.
- the two cladding glass layers consist of undoped quartz glass, the quartz glass for the outer of the cladding glass layers being provided by the respective hollow cylinder.
- a so-called core rod is first produced using the OVD process.
- soot particles are deposited in layers on a carrier rotating about its longitudinal axis by moving a separating burner back and forth, SiCI and GeCI being fed to the separating burner and hydrolyzed to SiO 2 and GeO 2 in a burner flame in the presence of oxygen.
- the ratio of SiCI 4 and GeCI is adjusted during the deposition of the inner layers so that a predetermined homogeneous GeO 2 concentration of 5 mol% results over this part of the wall thickness of the soot tube.
- the supply of GeCI 4 to the deposition burner is stopped and an inner cladding glass layer made of undoped SiO 2 is deposited.
- a soot tube After completion of the deposition process and removal of the carrier, a soot tube is obtained which is subjected to a dehydration treatment in order to remove the hydroxyl groups introduced due to the production process.
- the soot tube is placed in a dehydration furnace in a vertical orientation and first treated at a temperature in the range from 800 ° C. to about 1000 ° C. in a chlorine-containing atmosphere. The treatment lasts about eight hours. This gives a hydroxyl group concentration of less than 100 ppb by weight.
- the soot tube treated in this way is glazed in a glazing furnace at a temperature in the region of 1350 ° G and the inner bore is collapsed, so that a core rod with an outer diameter of 38 mm and the desired refractive index profile is obtained.
- the weight of the core rod is - depending on the length - up to 6 kg.
- the core glass of the core rod forms a core area with a diameter of approximately 8.5 ⁇ m.
- the core rods using the OVD process are produced using the known MCVD, VAD, FCVD (Furnace-CVD) or PCVD process.
- further cladding material is provided for the formation of the outer cladding glass layer in the form of a hollow cylinder, which in the Fiber drawing is collapsed onto the core rod in an ODD process.
- the hollow cylinder is produced analogously to the manufacture of the core rod described above using a conventional OVD process, but without the addition of a dopant. After the carrier has been removed, a soot tube is obtained which is subjected to the dehydration treatment described and then glazed.
- the outer wall of the hollow cylinder blank obtained in this way is ground to the desired outer dimension in several work steps by means of circumferential plunge or longitudinal grinding.
- the inner bore is drilled out by means of a drill and reworked by honing for the purpose of high-precision finishing in terms of shape and surface properties.
- a straight bore with an exactly circular cross-section is obtained which runs in the longitudinal axis direction.
- the quartz glass tube is briefly etched in a hydrofluoric acid bath, the HF concentration of which is between 5% and 30%, in order to reduce surface tensions and to remove damage caused by surface processing.
- the hollow cylinder blank obtained in this way has an outer diameter of 180 mm, an inner diameter of 42 mm and a length of 2500 mm.
- the dimensional deviation (t max - t m j n ) in the wall thickness is 0.5 mm. It is used - if necessary after cutting to length - as a hollow cylinder in the sense of this invention for the production of preforms for optical fibers or of optical fibers using an ODD process.
- a coaxial arrangement of the core rod and the hollow cylinder is fed in a vertical orientation to a heating zone and, starting with the lower end, zone-wise in a ring-shaped oven to a temperature of around 2050 ° C. and an optical fiber is drawn off from the softened area.
- the core rod rests on a constriction of the hollow cylinder. The production of a suitable constriction is explained in more detail below with reference to FIG. 1.
- Figure 1 shows a schematic representation of the production of a constriction of the inner bore 5 of a hollow cylinder 1. This is initially under formation of an axial composite 3 merged at the end face with a second, lower hollow cylinder 6 surrounding a core rod 4.
- Length, inner diameter and outer diameter of the upper and lower hollow cylinder 1, 6 are the same.
- the lower end of the axial cylinder assembly 3 produced in this way is fed to a ring furnace 11 in a vertical orientation, softened therein zone by zone and elongated to form a preform 8.
- the upper hollow cylinder 1 is clamped by means of a clamping jaw 12 of a holding device and thus simultaneously serves to hold the lower hollow cylinder 6.
- the elongation process is then ended and the upper hollow cylinder 1 is separated from the preform 8, in a parting plane which is indicated by the dotted line 10 and which also approximately corresponds to the welding point of the two hollow cylinders 1, 6.
- the inner bore 5 of the hollow cylinder 1 now has a constriction which is suitable for holding a core rod in a subsequent elongation process.
- the upper hollow cylinder 1 is accordingly equipped with a new core rod and fused with its upper, open end face to another hollow cylinder, which serves to hold the hollow cylinder 1 in the subsequent elongation process, and in which - as described above - during the elongation process to produce a Preform a narrowing of the inner bore is generated.
- FIG. 2 schematically shows a modification of the method described with reference to FIG. 1, the same reference numerals denoting identical or equivalent components or components, as are explained in more detail above with reference to FIG. 1 for the relevant reference numerals.
- the lower hollow cylinder 6 has an initial length of 125 cm
- the upper hollow cylinder 1 welded to it - just like the core rod 4 - has a length of 250 cm.
- the dashed line 8 characterizes the weld between the upper and lower hollow cylinders.
- the core rod 4 thus extends approximately 125 cm into the inner bore 5 of the upper hollow cylinder 1.
- the total length of the hollow cylinder assembly 3 is 125 cm shorter than in the procedure explained with reference to FIG. 1.
- the elongation process ends as soon as the onion 9 has reached the upper end of the core rod 4 and a sufficient narrowing of the inner bore 5 has formed in the upper hollow cylinder 1 above the core rod 4.
- the half hollow cylinder piece produced in this way has the narrowing of the inner bore at its lower end and becomes the lower one in the subsequent elongation process
- Hollow cylinder used by intermittently fusing it with a complete, upper hollow cylinder and equipping it with a core rod that extends up to half of the upper hollow cylinder. This process is repeated any number of times.
- the shorter overall length of the hollow cylinder assembly 3 enables a more compact design of the drawing furnace or the use of a dummy holding cylinder 2 which is connected to the upper end of the upper hollow cylinder 1 is welded, and act on the jaws 12 of a holding device which serves to hold both hollow cylinders 1, 6 in the furnace, as shown schematically in FIG.
- the intermittent welding of the two hollow cylinders works best if the outer diameter and the inner diameter are chamfered in at least one of the hollow cylinders, as is shown schematically in FIG.
- a linear chamfer 21 of the inside and outside diameter is produced, each of which has a width of 10 mm in the circumferential direction and in the longitudinal direction.
- a recess 22 with a depth of 2 mm is provided at the upper end, through which the quality of the removed part is not noticeably impaired.
- the chamfer counteracts the formation of internal or external beads when welding the upper and lower hollow cylinders at the end.
- the edge areas of the end faces of the two hollow cylinders facing the welding point are heated by means of a propane gas burner and softened for about 20 minutes, and then the softened ends are pressed against one another.
- FIG. 4 shows various views of the onion in the area of the weld between the upper and lower hollow cylinder before the separation.
- the hollow cylinder is designated here with the reference number 30.
- FIG. 4A shows the early closing of the inner bore 5 or the annular gap 32 during the elongation process in the event that a vacuum (absolute pressure ⁇ 1 mbar) is generated in the inner bore 5, 32 (drawing phase).
- an inner bore which is open at the bottom (despite the constriction) is aimed for in order to effectively clean the hollow cylinder before the subsequent elongation step.
- an open inner bore also allows gas purging before the elongation process begins.
- a parting plane which would result in an inner bore open at the bottom, would have to be set in the upper region of the onion 9, with the result that almost the entire onion mass would have to be discarded as a loss of material.
- FIG. 4B shows a variant for solving this problem by widening the annular gap 32 by increasing the pressure in the inner bore 5 or in the annular gap 32 to approximately ambient pressure (+ 10 mbar). As a result, the annular gap 32 extends far into the onion 9, so that even a parting plane 10 starting deep down on the onion 9 still results in an inner bore 5 which is open at the bottom.
- FIGS. 4C and 4D show a modification of the method shown schematically in FIG. 1 and FIGS. 4A and 4B, a holding rod 34 being used to prevent the core rod 4 from floating, particularly in the last phase of the elongation process.
- the holding rod 34 rests with its lower end on the core rod 4 via an intermediate plate 35, while its upper end rests against an abutment (not shown in FIG. 1).
- the outer diameter of the holding rod 34 is significantly smaller than the inner diameter of the inner bore 5, so that there is a wide annular gap 36 between the hollow cylinder inner wall and the holding rod 34.
- the annular gap 36 collapses late even under negative pressure and thereby extends far into the onion 9. Therefore, even in this case - without a change in pressure in the inner bore 5 - a parting plane 10 starting deep down on the onion 9 still results in an inner bore 5 which is open at the bottom.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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DE112004001053T DE112004001053B4 (de) | 2003-07-18 | 2004-07-18 | Verfahren zur Herstellung eines optischen Bauteils aus Quarzglas |
JP2006520761A JP4800940B2 (ja) | 2003-07-18 | 2004-07-18 | 石英ガラスから成る光学的な構成部分を製造するための方法 |
US10/565,099 US7854146B2 (en) | 2003-07-18 | 2004-07-18 | Method for production of an optical component from quartz glass |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE10333059A DE10333059A1 (de) | 2003-07-18 | 2003-07-18 | Verfahren zur Herstellung eines optischen Bauteils aus Quarzglas sowie Hohlzylinder aus Quarzglas zur Durchführung des Verfahrens |
DE10333059.3 | 2003-07-18 |
Publications (1)
Publication Number | Publication Date |
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WO2005009913A1 true WO2005009913A1 (de) | 2005-02-03 |
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ID=34071802
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2004/008033 WO2005009913A1 (de) | 2003-07-18 | 2004-07-18 | Verfahren zur herstellung eines optischen bauteils aus quarzglas |
PCT/EP2004/008032 WO2005009912A1 (de) | 2003-07-18 | 2004-07-18 | Verfahren zur herstellung eines optischen bauteils aus quarzglas sowie hohlzylinder aus quarzglas zur durchführung des verfahrens |
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PCT/EP2004/008032 WO2005009912A1 (de) | 2003-07-18 | 2004-07-18 | Verfahren zur herstellung eines optischen bauteils aus quarzglas sowie hohlzylinder aus quarzglas zur durchführung des verfahrens |
Country Status (5)
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US (2) | US7681416B2 (de) |
JP (2) | JP4603541B2 (de) |
CN (2) | CN100582038C (de) |
DE (3) | DE10333059A1 (de) |
WO (2) | WO2005009913A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102004014345B4 (de) * | 2004-03-22 | 2007-09-20 | Heraeus Tenevo Gmbh | Verfahren zur Herstellung eines optischen Bauteils |
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CN105198195B (zh) * | 2015-08-12 | 2018-02-27 | 安徽华欣药用玻璃制品有限公司 | 一种玻璃瓶内胆加工工艺 |
US10534134B2 (en) * | 2016-03-21 | 2020-01-14 | Kansas State University Research Foundation | Fluid-filled hollow optical fiber cell |
CN107337345B (zh) | 2016-05-03 | 2022-07-05 | 贺利氏石英北美有限责任公司 | 用于生产光学玻璃组件的伸长方法和预制件 |
EP3263533B1 (de) * | 2016-06-28 | 2019-05-08 | Heraeus Quarzglas GmbH & Co. KG | Seltenerdmetall-dotiertes quarzglas sowie verfahren für dessen herstellung |
CN106242262B (zh) * | 2016-07-14 | 2019-04-16 | 浙江富通光纤技术有限公司 | 掺杂光纤外包层的制备方法 |
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CN114634306A (zh) * | 2022-03-17 | 2022-06-17 | 深圳市比洋互联科技有限公司 | 一种四纤毛细管制备方法 |
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- 2004-07-18 WO PCT/EP2004/008032 patent/WO2005009912A1/de active Application Filing
- 2004-07-18 JP JP2006520760A patent/JP4603541B2/ja active Active
- 2004-07-18 DE DE112004001055T patent/DE112004001055B4/de not_active Expired - Fee Related
- 2004-07-18 CN CN200480020670A patent/CN100582038C/zh active Active
- 2004-07-18 US US10/565,134 patent/US7681416B2/en active Active
- 2004-07-18 JP JP2006520761A patent/JP4800940B2/ja not_active Expired - Fee Related
- 2004-07-18 DE DE112004001053T patent/DE112004001053B4/de not_active Expired - Fee Related
- 2004-07-18 US US10/565,099 patent/US7854146B2/en active Active
- 2004-07-18 CN CN200480020672A patent/CN100582039C/zh active Active
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US6584808B1 (en) * | 1997-08-19 | 2003-07-01 | Pirelli Cavi E Sistemi S.P.A. | Method of manufacturing an optical fiber preform by collapsing a tube onto a rod |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104203522A (zh) * | 2012-03-30 | 2014-12-10 | 赫罗伊斯石英玻璃股份有限两合公司 | 用于制造石英玻璃空心柱体的方法 |
EP3112323A1 (de) * | 2015-07-03 | 2017-01-04 | Heraeus Quarzglas GmbH & Co. KG | Verfahren zur herstellung eines substratrohres aus quarzglas |
US10322962B2 (en) | 2015-07-03 | 2019-06-18 | Heraeus Quarzglas Gmbh & Co. Kg | Method for producing a substrate tube of quartz glass |
US11649185B2 (en) | 2019-01-15 | 2023-05-16 | Heraeus Quartz North America Llc | Automated large outside diameter preform tipping process and resulting glass preforms |
Also Published As
Publication number | Publication date |
---|---|
US7854146B2 (en) | 2010-12-21 |
DE10333059A1 (de) | 2005-02-17 |
JP2006528125A (ja) | 2006-12-14 |
US20060207293A1 (en) | 2006-09-21 |
US7681416B2 (en) | 2010-03-23 |
DE112004001053D2 (de) | 2006-05-04 |
DE112004001053B4 (de) | 2007-07-19 |
JP4800940B2 (ja) | 2011-10-26 |
CN1823019A (zh) | 2006-08-23 |
DE112004001055D2 (de) | 2006-10-19 |
DE112004001055B4 (de) | 2007-12-20 |
JP2006528124A (ja) | 2006-12-14 |
WO2005009912A1 (de) | 2005-02-03 |
CN1823020A (zh) | 2006-08-23 |
US20060174659A1 (en) | 2006-08-10 |
JP4603541B2 (ja) | 2010-12-22 |
CN100582038C (zh) | 2010-01-20 |
CN100582039C (zh) | 2010-01-20 |
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