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1. 发明专利

JPH09169527A PRODUCTION OF GLASS FILM WITH SUBSTRATE 失效
公开(公告)号：JPH09169527A
公开(公告)日：1997-06-30
申请号：JP33320195
申请日：1995-12-21
申请人： FURUKAWA ELECTRIC CO LTD
发明人： SUZUKI YOSHIHISA , TAKEWAKI HIROKAZU , YOSHIDA KAZUAKI , IIDA YOSHITAKA
IPC分类号： C03B19/01 , C03C17/04 , C04B41/86
摘要： PROBLEM TO BE SOLVED: To provide a producing method of a glass film with substrate, which is capable of preventing the fusion between a heat resisting base and a substrate, the deformation or crack of the substrate and the glass film and uniformly forming the glass film. SOLUTION: In the method for producing the glass film with substrate by forming a glass particulates layer 3 on the substrate 2, placing the substrate on a layer composed of a granular refractory 9 and transparently vitrifying the glass particulates layer 3 by heating, the particle diameter A of the granular refractory 9 is 0.1mm

2. 发明专利

JPH0692682A OPTICAL WAVE GUIDE OF FLUORIDE GLASS 失效
公开(公告)号：JPH0692682A
公开(公告)日：1994-04-05
申请号：JP24028792
申请日：1992-09-09
申请人： FURUKAWA ELECTRIC CO LTD
发明人： FURUGUCHI MAKOTO , IIDA YOSHITAKA , OGURA KUNIO
IPC分类号： C03B19/02 , C03B19/04 , C03B37/012 , C03C3/32 , C03C13/04 , G02B6/00 , G02B6/02 , G02B6/12 , G02B6/16
摘要： PURPOSE:To obtain a definite high gain in broader wavelength area than that in the present circumstances by containing a specific amount of chlorine in a core part, in a optical wave guide of fluoride glass consisting of a ZBLAN- based fluoride glass and containing praseodymium (Pr) at least in the core part. CONSTITUTION:Fluorine as a constituent anion of a ZBLAN-based fluoride glass doped with Pr, concretely PrF is substituted with chlorine so as to contain 2-15mol% in a core part to prepare the objective optical wave guide. Thereby, wavelength area of signal light whose gain value is >=90% of the maximum gain value becomes broader than the wavelength range of 1300-1310mum in the present circumstances. For example, the ZBLAN-based fluoride glass containing Pr, concretely PrF3 and PbF2 is produced as follows. The chlorine concentration is controlled by substituting a part of BaF2 in the raw material with BaCl2. The substituted material is melted to prepare a rod for the core part. A pipe for clad is separately prepared by using ZBLAN-based fluoride glass doped with Hf, specifically HfF3 and the core part is inserted into the pipe for clad.

3. 发明专利

JPH0656473A OPTICAL WAVEGUIDE CONSISTING OF FLUOROGLASS 失效
公开(公告)号：JPH0656473A
公开(公告)日：1994-03-01
申请号：JP20648092
申请日：1992-08-03
申请人： FURUKAWA ELECTRIC CO LTD
发明人： FURUGUCHI MAKOTO , IIDA YOSHITAKA , OGURA KUNIO
IPC分类号： C03B19/02 , C03B37/012 , C03C3/32 , C03C13/04 , G02B6/00 , H01S3/06 , H01S3/07 , H01S3/17
摘要： PURPOSE:To provide a preformed material for optical waveguides drawable over a long distance, composed of Pr plus PbF2-doped ZBLAN-based fluoroglass as core, HfF4-doped ZBLAN-based fluoroglass as clad, and plain ZBLAN-based fluoroglass as the outermost layer. CONSTITUTION:ZBLAN(ZrF4-BaF2-LaF2-AlF3-NaF)-based fluoroglass doped with ca.2000ppm of Pr and ca.8mol% of PbF2 is melted and cast in a mold to make a core rod ca.8mm in outer diameter, which is then drawn in an inert gas into a core rod ca.3mm in outer diameter. A second batch of ZBLAN-based fluoroglass doped with ca.40mol% of HfF4 is melted and cast in a mold and then put to drilling to make a pipe for clad inner layer ca.15mm and ca.3.5mm in outer and inner diameters, respectively. The doped rode, is then threaded into this pipe and heated to ca.300 deg.C in an inert gas to form into a monolithic form. Similarly, a plain ZBLAN-based fluoroglass pipe is then threaded with the resultant core-clad rod.

4. 发明专利

JPH038735A PREPARATION OF FLUORIDE GLASS OPTICAL FIBER PREFORM 失效
公开(公告)号：JPH038735A
公开(公告)日：1991-01-16
申请号：JP14062689
申请日：1989-06-02
申请人： FURUKAWA ELECTRIC CO LTD
发明人： IIDA YOSHITAKA , SHIBATA TOSHIAKI , MIYAKOSHI MOTOHARU
IPC分类号： G02B6/00 , C03B37/012
摘要： PURPOSE:To prepare the subject base material capable of suppressing the optical loss thereof caused by the interfacial irregularity and heterogeneous crystalliza tion between the core and clad of the optical fiber by pouring melted fluoride glass into an upstanding fluoride glass tube and cooling and solidifying the glass in a specific condition. CONSTITUTION:Melted fluoride glass for the core of an optical fiber is poured into a fluoride glass tube for the clad of the optical fiber and simultaneously maintained so as not to contact with the inner wall of the fluoride glass tube until the melted fluoride glass for the core reaches the dropping point thereof in the glass tube for the clad. The core melted fluoride glass which has reached the dropping point is cooled and solidified to provide the preform. The prepara tion method prevents that the fluoride glass tube for the clad is irregularly and heterogeneously again heated by the melted fluoride glass for the core so as to cause the irregularity, crystallization, etc., at an interface between the two kinds of the fluoride glass, thereby permitting to prepare the fluoride glass optical fiber preform having an excellent transmission characteristic in a good yield.

5. 发明专利

JPH1017331A APPARATUS FOR PRODUCING OPTICAL WAVEGUIDE FILM 失效
公开(公告)号：JPH1017331A
公开(公告)日：1998-01-20
申请号：JP17052096
申请日：1996-07-01
申请人： FURUKAWA ELECTRIC CO LTD
发明人： IIDA YOSHITAKA
IPC分类号： G02B6/13 , C03B8/04 , C03B19/14 , C03B20/00
摘要： PROBLEM TO BE SOLVED: To provide an apparatus for producing an optical waveguide film which makes a film thickness uniform without impairing the deposition efficiency of the glass particulates deposited on a substrate and forms less air bubbles and scattering. SOLUTION: This apparatus for production is constituted so as to have a glass particulate synthesizing burner 3 which deposits the glass particulates 5 onto the substrate 2 by blowing the glass particulates 5 together with an oxyhydrogen frame to the substrate 2 from above and a discharge pipe 4 which expels the excess glass particulates failing to adhere on the substrate 2 from the parts near the substrate 2. In such a case, the air velocity of the discharge flow of the discharge pipe 4 is slower in the central part than in the outer peripheral part.

6. 发明专利

JPH06305753A PRODUCTION OF MULTICOMPONENT GLASS MOLDED ARTICLE FOR OPTICAL FIBER 失效
公开(公告)号：JPH06305753A
公开(公告)日：1994-11-01
申请号：JP11931893
申请日：1993-04-23
申请人： FURUKAWA ELECTRIC CO LTD
发明人： OGURA KUNIO , IIDA YOSHITAKA
IPC分类号： C03B19/02 , C03B37/012 , C03B37/014 , C03B20/00
摘要： PURPOSE:To efficiently produce the glass molded articles for optical fibers having high quality at a high yield by pouring a molten multicomponent glass raw material into a specific casting mold provided with a graphite film on a molding surface, thereby producing the glass molded articles. CONSTITUTION:The tubular casting mold 1 made of quartz glass is first heated to a high temp. of about >=1000 deg.C by a heater 2 and is held for a specified period of time; thereafter, gaseous acetylene is poured into the casting mold 1 to induce a thermal decomposition reaction on the inside surface (molding surface) of the casting mold and to synthesize a graphite film 3 of about >=50Angstrom thickness. A bottom cap 4 is then assembled to the casting mold 1 and the molten fluoride glass raw material 6 is poured from the crucible 5 into the casting mold 1 and is cooled. The bar-shaped fluoride glass molded articles 7 are then removed out of the casting mold 1. The bar-shaped fluoride glass molded articles 7 obtd. in such a manner have extremely smooth outer peripheral surfaces and, therefore, there is no need for surface treatments, such as mechanical polishing and chemical polishing.

7. 发明专利

JPH0632634A METHOD FOR DRAWING PREFORM FOR PHOTOWAVEGUIDE OF FLUORIDE GLASS 失效
公开(公告)号：JPH0632634A
公开(公告)日：1994-02-08
申请号：JP19097192
申请日：1992-07-17
申请人： FURUKAWA ELECTRIC CO LTD
发明人： IIDA YOSHITAKA , FURUGUCHI MAKOTO , OGURA KUNIO
IPC分类号： C03B37/027 , C03B37/012 , C03C3/32 , C03C13/04 , G02B6/00 , H01S3/06 , H01S3/07 , H01S3/17
摘要： PURPOSE:To draw preform into a given outer diameter without causing devitrification and to make mass production possible. CONSTITUTION:Preform 6 for photowaveguide of fluoride glass of ZrF4-BaF4- LaF3-AlF3-NaF system is set in the center of a transparent container 4 made of quartz glass. The preform 6 for photowaveguide of fluoride glass is heated to about 300 deg.C by using a burner 1 as a mobile heating source while sending an inert gas (nitrogen gas) from an inlet 8 to an outlet 9 by regulating a flow rate with a mass flow controller 3 and rotating the preform at a given number of revolutions and drawn. The drawing is carried out by confirming the outer diameter and a drawing point by an outer diameter measuring device 2.

8. 发明专利

JPH05322461A HEAT TRANSFER PIPE FOR COOLING UNIT 失效
公开(公告)号：JPH05322461A
公开(公告)日：1993-12-07
申请号：JP15142992
申请日：1992-05-19
申请人： FURUKAWA ELECTRIC CO LTD
发明人： SOTANI JIYUNJI , IIDA YOSHITAKA , MABUCHI MINORU , OKUYAMA TETSUO
IPC分类号： F28D15/02 , F28D15/04
摘要： PURPOSE:To provide an effective boiling and improve a thermal conductivity by a method wherein there are provided an outer pipe and an inner pipe shorter than the outer pipe and positioned in an evaporating part of the outer pipe and a capillary pipe member is inserted into a lower end portion of a flowing clearance between both pipes. CONSTITUTION:A cooling unit 3 is comprised of a several copper pipes having a specified length arranged in parallel while being raised upright, an upper header pipe 31 and a lower header pipe communicating with an upper end and a lower end of each of the pipes 30 to each other. In this case, each of the pipes 30 is comprised of an outer pipe 30a and an inner pipe 30b arranged within the outer pipe 30a through a narrow flowing clearance 30c and having a length not reaching at its upper end to the upper header pipe 31. The inner pipe 30b is fixed by abutting some projections 30d substantially equally spaced apart circumferentially at its lower end against the outer pipe 30a. A capillary pipe member 30d comprised of metallic mesh is inserted into the lower end of the flowing clearance 30c, this part is functioned as a boiling cavity and working liquid is boiled up.

9. 发明专利

JPS6360121A PRODUCTION OF DOPED QUARTZ 失效
公开(公告)号：JPS6360121A
公开(公告)日：1988-03-16
申请号：JP20223086
申请日：1986-08-28
申请人： FURUKAWA ELECTRIC CO LTD
发明人： SHIBUYA SEIJI , IIDA YOSHITAKA
IPC分类号： G02B6/00 , C03B8/00 , C03B8/04 , C03B20/00 , C03B37/014
摘要： PURPOSE:To sufficiently add dopant to a porous base material and to produce quartz contg. a high-concn. dopant by repeating an introducing stage of a prescribed raw material, a solidifying stage and an oxidizing stage and adding the dopant to the porous base material. CONSTITUTION:Inert gas is fed to the inside of the core pipe 4 of an electric furnace 1 and heated with a heater 5. A vessel 9 incorporated with a porous base material 6 and a doped raw material 8 is inserted via a supporting rod 7 from the upper part thereof and descended in a rotary state. The doped raw material 8 is heated at m.p. or more and evaporated and the inside of the core pipe 4 is regulated to the doped atmosphere and the doped raw material is introduced into respective pores of the porous base material 6. The doped raw material 8 is solidified by pulling up the porous base material 6 and quickly transferring it to the low-temp. region in the core pipe 4. The vessel 9 is once taken out to the outside of the core pipe 4. Then oxygen is fed to the inside of the core pipe 4 to hold this in the oxidizing atmosphere and the doped raw material 8 incorporated in the base material 6 is oxidized in the temp., range of m.p. or below of the doped raw material 8. After repeating these processes as necessary, the porous base material 6 is transparently vitrified by regulating the inside of the pipe 4 to the inert gas atmosphere and holding it at transparently vitrify ing temp.

10. 发明专利

JPS58125628A PREPARATION OF OPTICAL FIBER PREFORM 失效
公开(公告)号：JPS58125628A
公开(公告)日：1983-07-26
申请号：JP696782
申请日：1982-01-20
申请人： FURUKAWA ELECTRIC CO LTD
发明人： SHIBUYA SEIJI , SATOU TSUGIO , KOMATSU WATARU , TAGUCHI EIICHI , IIDA YOSHITAKA
IPC分类号： C03B37/018 , C03B37/014 , G02B6/00
摘要： PURPOSE:To obtain an optical fiber preform containing a large amount of OH groups and having excellent radiation resistance, by converting the glass soot to clear glass in an atmosphere containing steam. CONSTITUTION:Although the voids of the soot 1 contain water, it is necessary to put additional water in the void for the preparation of an optical fiber preform containing a large amount of OH groups. In order to satisfy the above requirement, the partial pressure of water in the He gas atmosphere in a heating furnace 2 is increased, and the soot 1 is converted to clear optical fiber preform by heating in the above furnace 2. This can be achieved by introducing He gas containing steam through the gas inlet 4 at the bottom of the core tube 3 of the furnace. The water-content of the void of the soot 1 is increased by the process, and the water is diffused into the glass by the high temperature treatment in the furnace 2 and enters into the network structure of the glass in the form of OH group. The conversion to clear glass can be carried out also by using pure steam in place of He as the atmosphere in the furnace 2.

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