| 摘要 |
PROBLEM TO BE SOLVED: To provide a retractable ball-point pen which makes a ball hard to fall due to a shock when falling or being knocked or the like, and is capable of obtaining a stable amount of ink outflow.SOLUTION: The retractable ball-point pen includes an attachment member, ink for the ball-point pen contains thermochromic microcapsule pigments whose particle size is 0.1-30 μm, and at the back of the ball, there is provided a coil spring that presses the ball to an inner wall of a chip end. A clearance of the ball in a longitudinal direction is 30-80 μm, ink consumption per 100 m is 200-800 mg, and holding force of the ball at the chip end is larger than pressurizing force of the coil spring that energizes a ball-point pen refill to a rear end side of a shaft cylinder. |
