Ball pen tip and ball pen therewith

Abstract

A ballpoint pen tip and ballpoint pen using a ball with a diameter smaller than 0.3 mm, in which an amount of ball-sinking is made to be as small as possible and ball-dropping is made to occur hardly. Either in a ballpoint pen tip 10 comprising a holder 20 with inward protrusions 22 formed by a plurality of adjacent positions to an end of a fine metal tube, every one of which locates at an equal distance from an end of a fine metal tube and is adjacent to the end, being so pressed and deformed inwardly that the inward protrusions 22 may have an inscribed circle with a diameter of F (mm), and a ball 30 with a diameter (D) smaller than 0.3 mm supported by the inward protrusions 22; or in a ballpoint pen tip comprising a ball house 23 formed by an inner space of an end of a columnar material being curved, an ink-inducting hole 27 formed to penetrate from another end of the columnar material to an adjacent position to the ball house 23, an ink-flowing hole 28 with a diameter of F (mm) formed to penetrate between the ball house 23 and the ink-inducting hole 27, and the ball 30 with a diameter (D) smaller than 0.3 mm inserted into the ball house 23; a following relationship is fulfilled; 0.4 <= F / D <= 0.6.

Description

technical field [0001] The present invention relates to a ballpoint pen point using a ball with a small diameter of less than 0.3 mm, especially a ballpoint pen point having a ball with a ball diameter of 0.29 mm or less, the shape of the ballpoint pen point formed by using a thin metal tube, and a ballpoint pen provided with the ballpoint pen point, and , The present invention relates to the shape of a ballpoint pen tip formed by cutting a cylindrical material. Background technique [0002] There are currently various ballpoint pen nibs in which a thin metal tube is processed into a support. [0003] This kind of ball-point pen point is that many places near the front end of the thin metal tube are extruded and deformed inward to form an inward protrusion as a receiving seat for the ball. Then, the ball is inserted into the receiving seat, and the front end of the thin metal tube is squeezed and deformed inward to form a riveting portion. According to the receiving seat a...

AI Technical Summary

Problems solved by technology

[0007] Like this, use the ball-point pen tip of the small-diameter ball that ball diameter is less than 0.3mm, especially when the ball diameter is 0.29mm or less, as the diameter of the ball becomes smaller, the diameter of the ink guide hole connected to the ink flow hole also becomes smaller, and the ink flow rate becomes smaller. If the supply cannot keep up, there will be problems such as flying white (カスレ) or broken handwriting

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