| 摘要 |
PROBLEM TO BE SOLVED: To provide a direct liquid type writing implement capable of maintaining stable writing performance over a long period of time even though a pipe type ballpoint pen tip is adopted as a pen point.SOLUTION: A direct liquid type writing implement includes a pen point 2, an ink tank 4 that directly stores ink, and an ink holding member 3 that is arranged between the pen point 2 and the ink tank 4 and temporarily holds ink over-flown in association with increase in inner pressure within the ink tank 4. The ink tank 4 is detachably attached to the rear of the ink holding member 3. The pen point 2 is formed of a ballpoint pen tip in which a ball 24 is rotatably held by an inward tip edge 22 that is formed by press-deforming a tapered tip part of a metallic pipe 21 inward in a radial direction and a plurality of inward protrusions 23 that are formed by press-deforming side walls in the vicinity of the tip of the metallic pipe 21 inward in the radial direction. An antiwear coating layer 25 is provided on the inside of each protrusion 23 and/or on a surface of the ball 24.SELECTED DRAWING: Figure 1 |
