Optical fiber compound insulator and photosensor internal insulator

摘要

PURPOSE:To reduce influence of thermal stress due to a difference in a coefficient of thermal expansion while preventing disconnection of a juncture spot due to external force by partitioning an insulator fixing optical fibers while filling up a throughhole inside a pocelain insulator with an insulating flexible substance provided in the almost orthogonal direction to an axis of the optical fibers. CONSTITUTION:Optical fibers 12 are inserted through a tubular insulating flexible substance 32 consisting of thermocontracting ethylene propylene rubber or the like and an insulating seal agent 33 is filled up inside this insulating flexible substance 32. Plate-shaped insulating flexible substances 34 to 36 are fitted in inside a throughhole 11 of a porcelain insulator 1 mutually separated inside the throughhole 11 and arranged in parallel, and these insulating flexible substances 34 to 36 are almost orthogonal to the axis of the optical fibers 12. Accordingly, thermal stress of an insulator 37 is dispersed every plural sections respectively so as to lighten local stress. Thereby, an optical sensor 13, the optical fibers 12 and the porcelain insulator 1 are prevented from damage so as to stabilize a function.