| 摘要 |
PROBLEM TO BE SOLVED: To improve heat exchange efficiency of laser light.SOLUTION: A light converging member 241 includes: a lens 2411; a reflection member 2412; and a holding member 2413. The lens 2411 includes: an incidence surface F1 of laser light to be irradiated from a light source 242; and an emerging surface F2 of the laser light. When a paper P is pushed against the lens 2411 by a pressing roller 243, an area A0 where the lens 2411 is pushed by the pressing roller 243 covers an area A1 corresponding to a whole of the emerging surface F2, and thus the area A1 is completely included in the area A0. Accordingly, the laser light passing through the lens 2411 and emerging from the emerging surface F2 hits any of the pressing roller 243 or the paper P pushed by the pressing roller 243, and does not leak to anything other than the pressing roller 243 or the paper P. The reflection member 2412 causes reflection light of the laser light emerging from the emerging surface F2 and reflected from the paper P to be reflected again toward the emerging surface F2 until the reflection light attenuates.SELECTED DRAWING: Figure 3 |
