| 摘要 |
<p>A pen point capable of withstanding a high pen pressure, having a copying capability equivalent to that of a ball-point pen, capable of preventing a pen core from being recessed or eliminating the possibility that the bending strength of the pen core becomes insufficient, capable of accurately setting the centering dimension of the pen core at all times, and capable of increasing a productivity, comprising a plastic pen core (2) having an ink capillary passage in axial direction and having a diameter of 1.5 mm or less and a metal holder (3), wherein the plastic pen core (2) forms a small diameter drum part (2d) from a writing part (2b) through a shoulder part with height difference (2c), a length (L) between the shoulder part with height difference (2c) and the tip of the writing part (2b) in axial direction is set to 0.5 ≤ L / D ≤ 1.2, where (D) is a core diameter, the metal holder (3) forms a contact ring part (3c) at a tip part (3b) having a fitting hole (3a) open thereto, and a drum part (2d) is inserted into the fitting hole (3a) in a combined state that the shoulder part with height difference (2c) comes in contact with a contact ring part (3c).</p> |
