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    PROCESS FOR PRODUCTION OF GLASS PREFORM FOR OPTICAL FIBER
    21.
    发明专利
    PROCESS FOR PRODUCTION OF GLASS PREFORM FOR OPTICAL FIBER 未知

    公开(公告)号：CA2116701C

    公开(公告)日：2003-12-30

    申请号：CA2116701

    申请日：1994-03-01

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： ITO MASUMI ,  DANZUKA TOSHIO ,  OHGA YUICHI ,  HOSHINO SUMIO ,  TSUCHIYA ICHIRO

    IPC: C03B8/04 ,  C03B20/00 ,  C03B37/014 ,  G02B6/00 ,  C03B37/018 ,  G02B6/18

    Abstract: The present invention relates to an improved process for providing the production of a glass preform for an optical fiber which includes substantially no bubbles therein and also which has a substantially uniform shape. The process for the production of a glass preform which comprises at least silica for an optical fiber is comprised of producing a body comprising a rod on which fine glass particles are deposited, preferably by a vapour phase reaction and heating the body to vitrify the body under a reduced atmosphere or a vacuum so that the glass preform is produced. The process includes a first heating step of degassing the body at a first heating temperature, a second heating step of shrinking the body at a second heating temperature which is higher than the first heating temperature and which is lower than a third heating temperature, and a third heating step of vitrifying the shrunken body at the third temperature which corresponds to a vitrification temperature of the fine glass particles so as to produce the glass preform.

    23.
    发明专利
    未知

    公开(公告)号：DE19983682T1

    公开(公告)日：2001-11-08

    申请号：DE19983682

    申请日：1999-10-29

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： TARU TOSHIKI ,  TSUCHIYA ICHIRO ,  TSUNEISHI KATSUYUKI ,  NAGAYAMA KATSUYA ,  KUWAHARA KAZUYA

    IPC: C03B37/025 ,  C03B37/027 ,  C03B37/029 ,  G02B6/00

    Abstract: A fiber drawing method according to the present invention is a drawing method of optical fiber for drawing an optical fiber 14 from one end of a fiber preform 13 by softening with heat, wherein the fiber preform 13 is set in a semi-closed space 10, 20 opening in part at a lower end in a fiber drawing furnace, the fiber preform 13 is heated by a heater 15 disposed on the lower end side of this semi-closed space 10, 20, and fiber drawing is carried out with adjusting a quantity of heat dissipation from the upper portion 20 of this semi-closed space.

    26.
    发明专利
    未知

    公开(公告)号：DE69421594T2

    公开(公告)日：2000-05-04

    申请号：DE69421594

    申请日：1994-07-12

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： NAGAYAMA KATSUYA ,  KOBAYASHI KOHEI ,  OHTA HIROAKI ,  TSUCHIYA ICHIRO

    IPC: C03B37/027 ,  C03B37/029

    Abstract: An optical fiber drawing furnace according to the invention comprises a core chamber into which an optical fiber parent material is inserted through the upper end thereof and from which a drawn optical fiber is taken out through an opening provided at the lower end thereof, gas supply means for introducing an inert gas into the core chamber to produce an inert gas atmosphere in the core chamber, heating means provided around the outer periphery of the core chamber for heating the optical fiber parent material to heat and melt the lower portion of the optical fiber parent material for drawing the optical fiber, and an internal core pipe provided inside the core chamber and comprising a cylindrical-shaped portion communicating at the lower portion thereof with the opening of the core chamber and a funnel-shaped portion provided on the upper side of the cylindrical-shaped portion and shaped to gradually increase in diameter toward the top thereof and surround the lower part of a melted portion of the optical fiber parent material.

    27.
    发明专利
    未知

    公开(公告)号：DE69421594D1

    公开(公告)日：1999-12-16

    申请号：DE69421594

    申请日：1994-07-12

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： NAGAYAMA KATSUYA ,  KOBAYASHI KOHEI ,  OHTA HIROAKI ,  TSUCHIYA ICHIRO

    IPC: C03B37/027 ,  C03B37/029

    Abstract: An optical fiber drawing furnace according to the invention comprises a core chamber into which an optical fiber parent material is inserted through the upper end thereof and from which a drawn optical fiber is taken out through an opening provided at the lower end thereof, gas supply means for introducing an inert gas into the core chamber to produce an inert gas atmosphere in the core chamber, heating means provided around the outer periphery of the core chamber for heating the optical fiber parent material to heat and melt the lower portion of the optical fiber parent material for drawing the optical fiber, and an internal core pipe provided inside the core chamber and comprising a cylindrical-shaped portion communicating at the lower portion thereof with the opening of the core chamber and a funnel-shaped portion provided on the upper side of the cylindrical-shaped portion and shaped to gradually increase in diameter toward the top thereof and surround the lower part of a melted portion of the optical fiber parent material.

    Method and apparatus for coating optical fiber
    29.
    发明专利
    Method and apparatus for coating optical fiber 未知

    公开(公告)号：AU694063B2

    公开(公告)日：1998-07-09

    申请号：AU7145696

    申请日：1996-10-04

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： OKUNO KAORU ,  INOUE AKIRA ,  OISHI KAZUMASA ,  KOBAYASHI KOHEI ,  TSUCHIYA ICHIRO

    IPC: C03C25/18 ,  C03C25/02

    Abstract: PCT No. PCT/JP96/02889 Sec. 371 Date Jun. 6, 1997 Sec. 102(e) Date Jun. 6, 1997 PCT Filed Oct. 4, 1996 PCT Pub. No. WO97/12841 PCT Pub. Date Apr. 10, 1997The present invention relates to an optical fiber coating method and an apparatus therefor which can form high quality coating layer on an optical fiber (12) by preventing non-concentricity of a coating resin (14) applied on the optical fiber (12) and admixing of bubble. The optical fiber coating apparatus according to the present invention includes at least one pair of an illumination light introducing window (39) and an optical fiber monitoring window (40) formed facing each other with the resin pool between in a side wall portion of a die holder (17), opposing a resin pool (27), a light source (41) opposing to the illumination light introducing window (39) and projecting an illumination light toward the center portion of the resin pool (27), an image pick-up device (42) opposing the optical fiber monitoring window (40) for monitoring at least a contact portion between the optical fiber (12) and the coating resin (14) and in the vicinity thereof, and coating condition modifying means for modifying a coating condition of the coating resin (14) with respect to the optical fiber (12) on the basis of the result of observation of the image pick-up device (42).

    PROCESS FOR HEATING VITRIFICATION OF POROUS PREFORM FOR OPTICAL FIBER
    30.
    发明专利
    PROCESS FOR HEATING VITRIFICATION OF POROUS PREFORM FOR OPTICAL FIBER 未知

    公开(公告)号：CA2085198C

    公开(公告)日：1996-10-01

    申请号：CA2085198

    申请日：1992-12-11

    Applicant: SUMITOMO ELECTRIC INDUSTRIES

    Inventor： TSUCHIYA ICHIRO ,  DANZUKA TOSHIO ,  ITO MASUMI

    IPC: C03B37/014 ,  G02B6/00

    Abstract: A process for the vitrification of a porous glass preform for an optical fiber involves heating the preform under an increasing pattern of temperature in a vacuum furnace comprising a muffle tube. The increasing pattern is divided into two steps consisting of a first step and a subsequent second step. The first step has a pattern in which the heating temperature is increased under a reduced pressure atmosphere and a gas comprising at least an inert gas is supplied to the vacuum furnace under the reduced pressure atmosphere. The second step has a pattern in which the heating temperature is increased under a reduced pressure atmosphere in which a gas comprising a smaller amount of an inert gas than in the first step is supplied to the furnace or under a vacuum pressure atmosphere in which no gas is supplied to the furnace.

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