| 摘要 |
[PROBLEMS] To provide a compact linear light irradiation device capable of improving light convergence efficiency and causing almost no irradiation irregularities. [MEANS FOR SOLVING THE PROBLEMS] The linear light irradiation device includes: a plurality of light emission sections (2) having a light emitter (21) and columnar lens in pair and emitting a linear light LL converged into a linear shape; and a holding body (3). The light emitter (21) has light output ends (4a) of optical fibers (4) arranged closely and in one string. The columnar lens is arranged in front of the light emitter (21) and extends along the direction P of the aforementioned string. The holding body (3) is arranged to oppose to a work W as a light irradiation object, has observation holes (3a, 3b) as through holes for observing the work W, and holds the light emission sections (2) so that the optic axial planes of the linear lights LL emitted from the light emission sections (2) intersect one another on a predetermined line.
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