Title:
大きな外径のプリフォームの自動化された尖鋭化方法および得られたガラスプリフォーム
Document Type and Number:
Japanese Patent JP6861860
Kind Code:
B2
Abstract:
An automated large outside diameter preform tipping process. A zone of the preform is heated inside a furnace and softened. The preform tip is shaped and the process is controlled by the movement of the glass above and below the heating zone and by sensing the weight of the lower part of the preform, which in effect is a measure of the viscosity of the softened material. Once the correct viscosity is reached, the bottom holder is moved away from the top holder with a non-linear, accelerated velocity profile (derived from the FEM simulation of glass flow) which is precisely programmed and controlled so that the preform tip is optimally shaped (usually short and sharp tipped) with minimum waste and waveguide distortion when drawn into a fiber. The same concept of the non-linear, accelerated velocity profile can also be applied to other tipping processes such as horizontal preform tipping processes.
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Inventors:
Thiurmima
Kai Huei Chang
Kai Huei Chang
Application Number:
JP2020003759A
Publication Date:
April 21, 2021
Filing Date:
January 14, 2020
Export Citation:
Assignee:
Heraeus Quartz North America LLC
International Classes:
C03B37/10; C03B37/012; G02B6/02
Domestic Patent References:
| JP2018083751A | ||||
| JP2003277092A | ||||
| JP11011972A | ||||
| JP2006027924A | ||||
| JP8277138A | ||||
| JP2003048738A |
Attorney, Agent or Firm:
Einzel Felix-Reinhard
Morita Taku
Junichi Maekawa
Hiroyasu Ninomiya
Ueshima
Morita Taku
Junichi Maekawa
Hiroyasu Ninomiya
Ueshima