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US 2006/0123851 A1Published application
Method of producing a glass preform
AssigneeNippon Electric Glass Co., Ltd.
InventorsFumio Sato, Akihiko Sakamoto
Life of this patent
Estimating the term…
Abstract
In a glass preform (10) to be subjected to fiber-drawing, use is made of a cylindrical glass tube (21) whose one end in an axial direction is sealed. A plurality of glass capillaries (22) extend in the glass tube in the axial direction. The glass capillaries are fused to one another into an integral structure. The glass capillaries have air holes periodically arranged on a plane perpendicular to the axial direction, respectively.
Claims17
1-10. (canceled)
A method of producing a glass preform, comprising the steps of:
- preparing a cylindrical glass tube whose one end in an axial direction is sealed;
- disposing a plurality of glass capillaries in the glass tube;
- and
- heating the glass tube with its interior kept in a reduced-pressure condition.
1 more element
(canceled)
Dependencies are inferred from the claim text.