Title:
HEAT RESISTANT OPTICAL FIBER
Document Type and Number:
Japanese Patent JPH05297255
Kind Code:
A
Abstract:
PURPOSE:To provide a polyimide covered optical fiber, which is capable of long distance transmission and excels in heat resistance, fatigue characteristic, and resistance against hydrogen. CONSTITUTION:A covering layer 3 of soft silicone resin having a low tensile modulus of elasticity is put on an optical fiber 1 as surrounding it. The tensile modulus is below 50kgf/mm<2>, while the film thickness of the covering layer lies in the extent 4-50mum. Another covering layer 2 of polyimide resin as heat resistant resin is put on the silicone layer 3 in such a way as surrounding it. In side of the silicone layer 3, a charbon layer 4 is formed. This carbon layer serves for enhancing the fatigue characteristic and resistance against hydrogen, while the soft silicon resin relieves hardening contraction of polyimide resin.
Inventors:
YAMADA KIMIMICHI
KUROSAWA YOSHINORI
TOKUNAGA TOSHIHIDE
OKUBO TAKESHI
NAKAMURA MASASHI
TAKUMA TAKEYOSHI
KUROSAWA YOSHINORI
TOKUNAGA TOSHIHIDE
OKUBO TAKESHI
NAKAMURA MASASHI
TAKUMA TAKEYOSHI
Application Number:
JP7732592A
Publication Date:
November 12, 1993
Filing Date:
March 31, 1992
Export Citation:
Assignee:
HITACHI CABLE
International Classes:
G02B6/44; (IPC1-7): G02B6/44
Attorney, Agent or Firm:
Takashi Matsumoto