| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ball-point pen which has a ball as a writing member rotating smoothly and supplies an appropriate amount of ink to the surface to be written, and gives a comfortable touch of writing. <P>SOLUTION: This ball-point pen tip is characterized in that the irregular surface condition of the ball is represented in a histogram and the ball which is designed in the way that the sum of the frequencies of a higher level than the level indicating a value of highest frequency falls within the range of 70 to 40% of the total measurement points, is used. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
