| 摘要 |
<p>A ball point pen (1) comprises a tip body (2), an ink tube (6), ink (7), an ink follower (8) and an elastic member (4). A ball point pen (1) comprises a tip body (2), an ink tube (6), ink (7), an ink follower (8) and an elastic member (4). (2) Comprises a front end edge portion, a ball seat provided inward at a front end, and a ball (3) rotatably held in the front end edge and the ball seat. (6) Forms the (2) at its front end. (7) Is reserved in (6). (8) Disposes at a rear end of (7) and advances with consumption of (7). (4) Urges (3) forward to bring (3) into contact with an inner surface of the front end edge portion of (2). The outflow value of (7) per writing distance of 100 m is measured such that the value is smaller or larger by 20 mg for a writing distance of 0 - 100 m and the measurement time is from start of writing to just before outflow of 80% of the amount of charged ink.</p> |
