LIGHT OUTPUT DECREASE PREVENTIVE STRUCTURE FOR OPTICAL FIBER

摘要

PROBLEM TO BE SOLVED: To provide a decrease preventive structure for light output which can prevent a decrease tendency of the light output resulting from the elliptical sectional shape of a light beam. SOLUTION: A direction wherein an optical fiber 9 held by an optical fiber holding member 11 is apt to shift in position is matched with an axial direction wherein the tolerance of the position shift is large.