METHOD FOR PRODUCING OPTICAL FIBER, OPTICAL FIBER, AND ENDOSCOPE

摘要

Provided is a for manufacturing an optical fiber for an endoscope that is inserted into an insertion portion of the endoscope and guides light, wherein inside an upright fiber drawing furnace 30, inside a hollow clad tube 22 including a clad glass, a core glass in a fluidized state runs down by gravity, whereby the core glass and the clad are