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124 records (took 0.025 seconds)

    11.
    发明专利
    未知

    公开(公告)号：IT8567278D0

    公开(公告)日：1985-03-22

    申请号：IT6727885

    申请日：1985-03-22

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B37/08 ,  C03B37/029 ,  H05B6/02 ,  H05B6/62 ,  C03B

    Abstract: The method of surfacing the heater of a furnace for optical fibre drawing allows elimination of defects in the inner heater surface, which defects give rise to particle emission towards the preform. This is achieved by depositing a thin layer of a mixture of oxides compatible with the material composing the heater.

    14.
    发明专利
    未知

    公开(公告)号：DK428884A

    公开(公告)日：1985-03-16

    申请号：DK428884

    申请日：1984-09-07

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B37/018 ,  G02B6/00 ,  C03B

    Abstract: The process allows a uniform layer of glass particles, forming the preform, to be deposited on the internal wall of a supporting tube rotated around its axis. A suitable relationship is provided to determine the temperature distribution in the deposition zone. The apparatus makes use of different types of heat sources for generating inside the tube a temperature with the distribution required by the process.

    15.
    发明专利
    未知

    公开(公告)号：IT8468255D0

    公开(公告)日：1984-12-18

    申请号：IT6825584

    申请日：1984-12-18

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B37/014 ,  C03B8/02 ,  C03B19/12 ,  C03B37/016 ,  C03B37/027 ,  G02B6/00 ,  C03B

    Abstract: The apparatus allows the continuous production of optical fibres (15) starting from liquid-phase reactants. They are injected into a pressurized vertical vessel (3), comprising a second coaxial vessel (4), which can be vertically displaced for the variations of the refractive-index profile. The first vessel supplies material for the cladding, the second for the fibre core.Suitable furnaces (6,9,14) help the reaction and allow preform sintering and drawing.

    16.
    发明专利
    未知

    公开(公告)号：BR8306623A

    公开(公告)日：1984-07-31

    申请号：BR8306623

    申请日：1983-12-02

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B19/14 ,  C03B37/018 ,  C03B37/025 ,  G02B6/00 ,  G02B5/16

    Abstract: Process for eliminating the axial refractive-index depression in optical fibres, obtained by the MCVD process, consisting in generating a pressure of dopant when in vapour state, equal to the vapour pressure of the dopant itself, inside the preform, during the collapsing state.

    19.
    发明专利
    未知

    公开(公告)号：IT7968789D0

    公开(公告)日：1979-09-10

    申请号：IT6878979

    申请日：1979-09-10

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO ,  VERGNANO PAOLO

    IPC: C03B8/02 ,  C03B37/018 ,  C03B37/00 ,  C03B37/016 ,  G02B6/00 ,  G02B

    Abstract: The invention concerns a method of and an apparatus for the production of preforms to be drawn into optical fibres, used as light conductors in telecommunications. Main liquid reactants are sent with a liquid oxidant towards a cylindrical support to the attainment of a preform of the required size. Then by chemical and physical means residual water is eliminated and the preform is collapsed to form a cylindrical rod.

    20.
    发明专利
    未知

    公开(公告)号：DK158577B

    公开(公告)日：1990-06-11

    申请号：DK436084

    申请日：1984-09-12

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B37/018 ,  C03C13/04 ,  C07C13/04 ,  G02B6/00

    Abstract: The process of manufacturing optical fibers of extremely low loss in the medium infrared permits the fabrication of glass preforms having as basic materials metal-fluorides obtained from vapor-phase reactants.

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