BALL POINT PEN, WRITING LEAD, AND PRODUCTION METHOD OF BALL POINT PEN OR WRITING LEAD

摘要

PROBLEM TO BE SOLVED: To provide a ball point pen in which a covering member for covering a tip end part of a pen point chip is not detached carelessly, and a writing lead.;SOLUTION: A ball point pen has a pen point chip 2 to which a writing ball 7 is rotatably attached, and a resin covering member 15 for covering at least, a ball exposed part is attached to a pen point part 4 which is a tip end part of the pen point chip 2, in a cross section in which the pen point chip 2 is cut in a direction vertical to a center axis M, an area where the covering member 15 surrounds whole periphery of the pen point chip 2 is an area where, an outer diameter of the covering member 15 becomes smaller toward a tip end generally.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2018,JPO&INPIT