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    Elongation method and preform for producing an optical glass component
    3.
    发明授权
    Elongation method and preform for producing an optical glass component 有权

    公开(公告)号：US11618708B2

    公开(公告)日：2023-04-04

    申请号：US15497316

    申请日：2017-04-26

    申请人： HERAEUS QUARTZ NORTH AMERICA LLC

    发明人： Qiulin Ma ,  Kai Huei Chang ,  Evan P. Green

    IPC分类号： C03B37/025 ,  C03B37/012

    摘要： Method of producing glass components and preforms for use in the method. The preform includes a primary rod having a constant outside diameter and a square bottom and a sacrificial tip having a first end attached to the bottom of the primary rod, a second end opposite the first end, and a hollow interior region extending from the first end to the second end. The sacrificial tip is circular in cross section and the first end of the sacrificial tip has an outside diameter equal to the outside diameter of the primary rod. When the preform is heated in a furnace, the sacrificial tip melts and collapses into a drawing bulb which either draws the primary rod directly into the glass fiber or results in a tapered (i.e. tipped) preform for subsequent fiber draw. Material waste as well as the drip time is reduced and the cladding-to-core ratio, crucial for waveguide properties, is maintained for the whole preform compared to a square cut preform without the sacrificial tip.

    ELONGATION METHOD AND PREFORM FOR PRODUCING AN OPTICAL GLASS COMPONENT
    4.
    发明申请
    ELONGATION METHOD AND PREFORM FOR PRODUCING AN OPTICAL GLASS COMPONENT 有权

    公开(公告)号：US20210130221A1

    公开(公告)日：2021-05-06

    申请号：US17152518

    申请日：2021-01-19

    申请人： HERAEUS QUARTZ NORTH AMERICA LLC

    发明人： Qiulin Ma ,  Kai Huei Chang ,  Evan P. Green

    IPC分类号： C03B37/025 ,  C03B37/012

    摘要： Method of producing glass components and preforms for use in the method. The preform includes a primary rod having a constant outside diameter and a flat bottom portion, wherein the primary rod comprises a core rod surrounded by at least one outer cladding layer; and a cylindrical sacrificial tip having a first end attached to the flat bottom portion of the primary rod, a second end opposite the first end, and a hollow interior region extending fully from the first end to the second end, wherein the sacrificial tip is circular in cross section and the first end of the sacrificial tip has a constant inside diameter and outside diameter along its entire length from the first end to the second end, and wherein the constant outside diameter is equal to the outside diameter of the primary rod. When the preform is heated in a furnace, the sacrificial tip melts and collapses into a drawing bulb which either draws the primary rod directly into the glass fiber or results in a tapered (i.e. tipped) preform for subsequent fiber draw. Material waste as well as the drip time is reduced and the cladding-to-core ratio, crucial for waveguide properties, is maintained for the whole preform compared to a square cut preform without the sacrificial tip.

    Elongation method and preform for producing an optical glass component
    5.
    发明授权
    Elongation method and preform for producing an optical glass component 有权

    公开(公告)号：US11840472B2

    公开(公告)日：2023-12-12

    申请号：US17152518

    申请日：2021-01-19

    申请人： HERAEUS QUARTZ NORTH AMERICA LLC

    发明人： Qiulin Ma ,  Kai Huei Chang ,  Evan P. Green

    IPC分类号： C03B37/025 ,  C03B37/012

    CPC分类号： C03B37/025 ,  C03B37/01205 ,  C03B37/01225 ,  C03B2205/13 ,  Y02P40/57

    摘要： Method of producing glass components and preforms for use in the method. The preform includes a primary rod having a constant outside diameter and a flat bottom portion, wherein the primary rod comprises a core rod surrounded by at least one outer cladding layer; and a cylindrical sacrificial tip having a first end attached to the flat bottom portion of the primary rod, a second end opposite the first end, and a hollow interior region extending fully from the first end to the second end, wherein the sacrificial tip is circular in cross section and the first end of the sacrificial tip has a constant inside diameter and outside diameter along its entire length from the first end to the second end, and wherein the constant outside diameter is equal to the outside diameter of the primary rod. When the preform is heated in a furnace, the sacrificial tip melts and collapses into a drawing bulb which either draws the primary rod directly into the glass fiber or results in a tapered (i.e. tipped) preform for subsequent fiber draw. Material waste as well as the drip time is reduced and the cladding-to-core ratio, crucial for waveguide properties, is maintained for the whole preform compared to a square cut preform without the sacrificial tip.

    Method for preform or tube drawing based on its viscosity
    6.
    发明授权
    Method for preform or tube drawing based on its viscosity 有权

    公开(公告)号：US11454580B2

    公开(公告)日：2022-09-27

    申请号：US15517045

    申请日：2014-10-14

    申请人： HERAEUS QUARTZ NORTH AMERICA LLC

    发明人： Georges Levon Fattal ,  James E. Beavers, Jr. ,  Kai Huei Chang ,  Evan P. Green ,  Qiulin Ma

    IPC分类号： G01N11/06 ,  G01N11/02 ,  C03B37/012 ,  G01N11/00 ,  C03B23/047 ,  G01N11/08 ,  G01N11/04

    摘要： Methods for preform and tube draw based on controlling forming zone viscosity determined by calculating a holding force exerted by the glass component in the forming zone on the strand being drawn below. The holding force may be calculated by determining a gravitational force applied to the strand and a pulling force applied to the strand by a pulling device, where the holding force is equal to the opposite of the algebraic sum of the gravitational and pulling forces. The holding force may also be calculated by measuring a stress-induced birefringence in the strand at a point between the forming zone and the pulling device, determining an amount of force applied to the strand at the point corresponding to the birefringence, and calculating the holding force by correcting the amount of force for a gravitational effect of the weight of the strand between the forming zone and the point.