| 摘要 |
PURPOSE:To raise the durability of an indicator for computers by a method in which a wide space is formed inside of the lowest part of an ink-impregnable spongy molding and a small tube of a polymerized synthetic resin is positioned to the wide space. CONSTITUTION:Duracon treated with an isotope is used in a porous tube 4 for a pen point. An outer frame 6 is formed on the upper part of the tip 1, and a soft porous sponge 7 is fitted to the inside of the tip 1. A projection 5 is formed on the upside of the porous tube 4 for the pen point and fitted into the recession 3 of the tip 1. The tip 1 is dipped into a synthetic resin liquid by turning the tube 4 upwards and dried in the air to form a surface film 8. The contamination of the outer surface with ink liquid can thus be prevented, and the evaporation of the ink liquid can also be avoided. |
