| 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 flow hole but not arriving to the inner hole of the rear end part of the tip. A joining part angle between the outermost wall surface from the ink flowing hole of the ink flowing groove and the bottom wall surface is set at least at 150° and not more than 180°, or the bottom wall surface of the ink flowing groove is a circular arcuate surface. <P>COPYRIGHT: (C)2007,JPO&INPIT |
