| 摘要 |
PCT No. PCT/JP97/04264 Sec. 371 Date Jul. 8, 1999 Sec. 102(e) Date Jul. 8, 1999 PCT Filed Nov. 21, 1997 PCT Pub. No. WO98/30401 PCT Pub. Date Jul. 16, 1998A ball-point pen having a point assembly, in which the inside and outside diameters of a press formed portion (3) for preventing a ball (1) from slipping out, a sealing face (8), the projected amount of the ball, the diameter of a ball seat (16), the longitudinal backlash and the like are formed in optimized dimensions, sealing face (8) is configured so as to have a radius of curvature approximately equal to that of ball (1), and ball seat (16) having a radius of curvature approximately equal to that of ball (1) is formed in the rear of ball (1), while a multiple number of channels (4) for leading ink (13) to the pen point are provided inside the point assembly.
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