PURPOSE: To decrease the fracture of the fibers in the boundary part and to enable the bending of the forward end part at an acute angle by filling a flexible plastic in the boundary part between the end part and flexible part of a flexible optical fiber bundle having the end parts which are stuck to one body, and winding and reinforcing the outside circumference thereof with a linear member.
CONSTITUTION: An elution preventive covering 20 is applied in both end parts of a fiber bundle obtained by heating and melt sticking an optical fiber bundle with tripple optical fibers each consisting of core glass 2, convering glass 3 and acid soluble glass 4 and stretching said bundle, whereafter the bundle is dipped in eluting liquid to elute the glass 4 whereby a flexible part 28 is formed in the bundle except the covering parts 20 in the end parts. The many optical fibers 22 in the end part 24a are stuck in one body by the acid soluble glass 24. A flexible plastic filler 29 is filled in the boundary part 25a with the flexible part and a linear member 27a such as cotton or the like is wound on a part 25b of the part 25a to reinforce the same. A reinforcing pipe 26a is fitted onto the end part 24a. The fracture in the part 25a is thus decreased and the bending of the forward end part at an acute angle is made possible.
MARUYAMA TSUTOMU
KUMAKURA YOSHIYUKI
KUWAYAMA SHIGEO
| JPS5098343A | 1975-08-05 |