| 摘要 |
PROBLEM TO BE SOLVED: To accurately form a hole without changing characteristics, physical properties of a resin such as adhesive properties or the like of a lead protective tube with small thermal diffusion by charging a resin in the tube, and removing a part of the charging resin by a laser beam to form a hole for feeding a lead. SOLUTION: A chuck 3 externally engaged with a forward outer periphery of a chuck ring 2 is disposed in a barrel 1 of the mechanical pencil, and a tip member 4 is mounted forward of the barrel 1 by threading or the like. A lead protective tube 5 made of a metal material or the like is mounted at a tip end of the member 4, a resin such as a reaction curable resin, a thermoplastic resin or the like is charged in the tube 5 to form a lead holding member 7. The resin formed in the tube 5 is partly formed in a length for holding the entirety or the lead in the tube 5, the part of the charged resin is removed by a laser beam, thereby completing the member 7 having a cylindrical or the like hole. As a laser medium of the beam, a ruby laser or the like is used.
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