公开(公告)号：NO922952A

公开(公告)日：1993-01-27

申请号：NO922952

申请日：1992-07-24

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： OHGA YUICHI ,  DANZUKA TOSHIO ,  SAITO MASAHIDE ,  AMEMIYA KOUJI ,  YOKOTA HIROSHI

IPC: C03B29/04 ,  C03B37/012 ,  C03B37/15 ,  C03B37/04

CPC classification number: C03B37/01237

公开(公告)号：CA2070753A1

公开(公告)日：1992-12-13

申请号：CA2070753

申请日：1992-06-09

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： AIKAWA HARUHIKO ,  ISHIGURO YOICHI ,  DANZUKA TOSHIO

IPC: C03C25/42 ,  C03C25/10 ,  C03C25/22 ,  C23C16/54 ,  G02B6/44 ,  C03C25/02

Abstract: A mass production method and apparatus of hermetic coating optical fiber where a bare fiber drawn from a preform is hermetically coated by CVD method in a reactor vessel, wherein a liquid flushes solid particles or by-products sticking to the reactor inner wall. The liquid may be supplied continuously or intermittently, to flush carbon particles generated during carbon coating process. The invention enables to produce a long hermetic coating optical fiber without choking the reactor, and improves a yield rate and productivity.

公开(公告)号：NO920724A

公开(公告)日：1992-08-26

申请号：NO920724

申请日：1992-02-24

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： ITO MASUMI ,  KANAMORI HIROO ,  DANZUKA TOSHIO ,  YOKOTA HIROSHI

IPC: C03B37/012 ,  C03B37/014 ,  G02B6/00 ,  C03C17/02

CPC classification number: C03B37/01248 ,  C03B37/01211 ,  C03B37/01257 ,  C03B2201/31 ,  C03B2201/42

公开(公告)号：FI920784A

公开(公告)日：1992-08-26

申请号：FI920784

申请日：1992-02-24

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： ITO MASUMI ,  KANAMORI HIROO ,  DANZUKA TOSHIO ,  YOKOTA HIROSHI

IPC: C03B37/012 ,  C03B37/014 ,  G02B6/00

Abstract: A glass preform for use in the fabrication of an optical fiber having a low transmission loss is produced by inserting a glass rod as a core material in a glass tube as a cladding material having a lower refractive index than that of the core material, and heating the so formed composite of the glass rod and the glass tube from the outside after filling a mixed gas containing a halogen-containing gas and oxygen gas in a space between the glass rod and the glass tube to fuse them together to produce the glass preform. Formation of bubbles in the glass preform is thereby suppressed.

公开(公告)号：AU1074892A

公开(公告)日：1992-08-13

申请号：AU1074892

申请日：1992-02-05

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： DANZUKA TOSHIO ,  ITO MASUMI ,  SAITO TATSUHIKO ,  TSUCHIYA ICHIRO

IPC: C03B37/012 ,  C03B37/014 ,  G02B6/00 ,  C03B37/018

Abstract: A glass preform for use in the fabrication of an optical fiber having a reduced transmission loss is produced by synthesizing a soot preform by a vapor synthesis method and consolidating the soot preform in an electric furnace to obtain a glass preform, wherein an intermediate body consisting of a core portion and an inner part of a cladding portion is consolidated under atmospheric pressure and an outer part of the cladding portion which surrounds a periphery of the intermediated body is consolidated under reduced pressure or in vacuo.

公开(公告)号：AU609621B2

公开(公告)日：1991-05-02

申请号：AU3708089

申请日：1989-06-27

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： ITO MASUMI ,  YOKOTA HIROSHI ,  DANZUKA TOSHIO ,  TAKAGI MASAHIRO

IPC: C03B8/04 ,  C03B37/014 ,  G02B6/00 ,  C03B37/012

Abstract: A glass preform for use in the fabrication of an optical fiber having little bubbles is produced by a method comprising depositing glass soot on a periphery of a starting glass rod to from a porous glass preform, heating and sintering the porous glass preform in a helium atmosphere to consolidate the porous glass preform and then heating the sintered glass in an atmosphere containing an inert gas except helium having partial pressure of the inert gas of not lower than 0.8 atm. to otbain a transparent glass preform.

公开(公告)号：CA1261685A

公开(公告)日：1989-09-26

申请号：CA477551

申请日：1985-03-26

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： DANZUKA TOSHIO ,  YOKOTA HIROSHI ,  ISHIGURO YOICHI

IPC: G02B6/00 ,  C03B37/014 ,  C03B37/018

Abstract: The invention provides a method for producing a glass preform for an optical fiber comprising jetting a raw material for glass containing SiC14 from a first nozzle of a multi-nozzle burner and a hydrogen-containing silicon compound with larger reaction heat than SiC14 from a second nozzle surrounding the first nozzle, flame hydrolyzing the glass raw material to synthesize fine glass particles, depositing the glass particles on a starting member to form a porous soot preform having a controlled bulk density distribution and heating and sintering the soot preform to form a transparent glass preform. The method allows large glass preforms to be stably produced without cracking.

公开(公告)号：AU4393785A

公开(公告)日：1986-01-16

申请号：AU4393785

申请日：1985-06-21

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： DANZUKA TOSHIO ,  YOKOTA HIROSHI ,  ISHIGURO YOICHI

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

Abstract: A method for producing a glass preform for an optical fiber by means at least two burners, comprising jetting a glass raw material containing SiCl4 from the first center burner and a hydrogen-containing silicon compound with larger reaction heat than SiCl4 from at least one second burner, flame hydrolyzing the glas raw material to synthesizing fine glass particles, depositing the fine glass particles on a starting member to form a porous soot preform and heating and sintering the soot preform to obtain a transparent glass preform, by which a large preform is stably produced and a bulk density of the preform is easily controlled.

公开(公告)号：CA2099942C

公开(公告)日：2004-10-26

申请号：CA2099942

申请日：1993-07-06

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： HOSHINO SUMIO ,  DANZUKA TOSHIO ,  OHGA YUICHI ,  ITO MASUMI ,  MUKAI KATSUZO

IPC: C03B37/027 ,  C03B20/00 ,  C03B37/012 ,  C03B37/014 ,  C03B37/018 ,  G02B6/00 ,  C03B37/023

Abstract: A glass preform for an optical fiber is effectively drawn by connecting dummy rods to both ends of the glass preform and connecting the dummy rods to fitting members.

公开(公告)号：CA2096872C

公开(公告)日：2003-11-18

申请号：CA2096872

申请日：1993-05-25

Applicant: SUMITOMO ELECTRIC INDUSTRIES

Inventor： AIKAWA HARUHIKO ,  NAGAYAMA KATSUYA ,  DANZUKA TOSHIO

IPC: C03C25/42 ,  C03C25/10 ,  C03C25/22 ,  C23C16/54 ,  G02B6/44 ,  C03C25/02 ,  G02B6/02 ,  C03B37/027 ,  C23C14/56

Abstract: The present invention is directed to an apparatus for the production of a hermetically coated optical fiber in which a glass preform for an optical fiber is melt drawn in a melt drawing furnace to produce a bare optical fiber which is passed to a reactor where a feed gas is supplied. The bare optical fiber is coated with a thin carbon coating made from the feed gas using a chemical vapour deposition (CVD) method wherein the reactor comprises an upper portion to which the feed gas is supplied, a middle portion in which the CVD method is substantially carried out and a lower portion from which an exhaust gas is withdrawn, and a cross sectional area of the middle portion perpendicular to a longitudinal direction of the optical fiber is larger than that of the upper portion.