| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ball-point pen tip, which is excellent in ink followability regardless of a kind and viscosity of an ink. <P>SOLUTION: In a ball holding chamber at a ball-point pen tip, a ball is rotatably held and, at the center of the bottom wall of the ball holding chamber, provided are: an ink flowing hole communicating with an inner hole at the rear end part of the tip; and ink flowing grooves each having a near U-shaped cross section and radially extending from the ink flowing hole but not arriving to the inner hole of the rear end part of the tip. An ink flowing groove has a connecting surface connecting the wall surface farthest from the ink flowing hole and, at the same time, an inequality: α>β is satisfied, wherein α is a tilt angle of the connecting surface, and β is a tilt angle of the bottom wall surface. Alternatively, the connecting surface is set to be a circular arcuate surface. <P>COPYRIGHT: (C)2007,JPO&INPIT |
