GAS PRESSURIZED TYPE WRITING IMPLEMENT

摘要

PROBLEM TO BE SOLVED: To provide a gas pressurized type ball pen capable of consuming ink to the last under a stabilized state by preventing a back flow in a tube body without using a float.

SOLUTION: The gas pressurized type writing implement in which a writing tip (10) is provided at the tip, and a tube body (12) containing ink (11) to be fed to the writing tip (10) is provided inside. A pressurized gas (13) is confined in a space on the anti-tip side of the tube body (12), is characterized in that an arithmetic mean surface roughness (Ra) of the inner surface of the tube body (12) is within the range of 0μmCOPYRIGHT: (C)2004,JPO