LINE ILLUMINATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To obtain a line illumination apparatus which reduces the loss of energy required for illumination and which eliminates an influence on an inspection even when an uneven part or the like exists on an object to be inspected. SOLUTION: This line illumination apparatus 10 is provided with a pair of illumination units 12a, 12b of the same structure. In the illumination unit 12a, a first light guide 16a which is composed of many optical fibers makes light radiated by a light source 14a on an optical connector 18a as slender rectangular light. Radiant light from the optical connector 18a is divided by three second light guides 20 (20a to 20c). The respective light guides 20 are formed in a thin sheet shape. Light radiation faces 22 of light guides 20a to 20f form nearly semicylindrical faces whigh surround the linear irradiation region of an object 28 to be inspected.