| 摘要 |
PROBLEM TO BE SOLVED: To provide a laser exposure device for plate-making wherein an exposure can be performed in such a manner that by using a large number of semiconductor laser beams and optical fibers, a large number of laser beams are overlapped by a precise pitch in order under a linked chain form for the exposure. SOLUTION: Regarding a set of optical fiber passing-supporting sections 7a, 7a and so forth of a diagonal arrangement, which are formed on a tip end side bracket 7 at the end section closer to an optical lens system of the optical fiber, a pitch P1 to be shifted in the surface longitudinal direction of a roll to be made into a plate is 1/2 to approximate 3/5 of the beam diameter of the laser beam entering the optical lens system 4. Also, a pitch P2 to be shifted in the circumferential direction of the roll to be made into the plate is separated by a proper dimension in a manner to keep the bracket strength. Also, a pitch P3 to be shifted in the surface longitudinal direction of the roll to be made into the plate of the diagonal arrangement line of the set of the optical fiber passing-supporting section is a value obtained by multiplying the pitch P1 by the number of the optical fiber passing-supporting sections of the set.
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