the glass soot preform quickly shrinks.Since the lower end of the soot preform has a large surface area to be heated than the middle part, the former is more easily heated, that is, more easily shrinks than the latter. 6, it was found that a heating rate between the first heating step and the heating step for vitrification has some influence on the uniformity of theouter diameter of the vitrified preform, namely a difference of the outer diameter between the lower end and the middle part of the preform. In addition to the absence of bubbles in the preform, a uniform outer diameter of the vitrified preform is also important. direct drawing of molten glass from nozzles Cooling fins therefor C03B37/02- Manufacture of glass fibres or filaments by drawing or extruding, e.g.C03B37/01446- Thermal after-treatment of preforms, e.g.vapour phase deposition of bulk porous glass either by outside vapour deposition, or by outside vapour phase oxidation or by vapour axial deposition
C03B37/014- Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g.C03B37/012- Manufacture of preforms for drawing fibres or filaments.C03B37/01- Manufacture of glass fibres or filaments.
C03B37/00- Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags.C03B- MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES.Assignors: DANZUKA, TOSHIO, ITO, MASUMI, TSUCHIYA, ICHIRO Application granted granted Critical Publication of US5330548A publication Critical patent/US5330548A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links reassignment SUMITOMO ELECTRIC INDUSTRIES, LTD. Priority claimed from JP3179814A external-priority patent/JP2836302B2/en Priority claimed from JP8864092A external-priority patent/JP2985493B2/en Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Family has litigation Priority claimed from JP3-179814 external-priority First worldwide family litigation filed litigation Critical (A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License. Original Assignee Sumitomo Electric Industries Ltd Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US07/913,965 Inventor Toshio Danzuka Masumi Ito Ichiro Tsuchiya Current Assignee (The listed assignees may be inaccurate.
Glass preform pdf#
Google Patents Method for producing glass preform for optical fiberĭownload PDF Info Publication number US5330548A US5330548A US07/913,965 US91396592A US5330548A US 5330548 A US5330548 A US 5330548A US 91396592 A US91396592 A US 91396592A US 5330548 A US5330548 A US 5330548A Authority US United States Prior art keywords preform heating temperature glass vitrified Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US5330548A - Method for producing glass preform for optical fiber US5330548A - Method for producing glass preform for optical fiber
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