INK DEPLETION DETECTION-TYPE WRITING UTENSIL

摘要

PPROBLEM TO BE SOLVED: To provide an ink depletion detection-type writing utensil which is almost free from the possibilities of ink depletion inside an ink guide pipe due to ink freezing and can positively ensure the detection of ink depletion, especially when an aqueous ink is stored, in the writing utensil to supply the ink with which an ink occlusion element is impregnated inside a barrel, to a pen point as a writing part. PSOLUTION: This ink depletion detection-type writing utensil is of such a structure that the ink with which the ink occlusion element is impregnated inside the barrel, is supplied to the pen point as the writing part. The ink is supplied to the pen point through the ink guide pipe with an ink repellent layer formed of a resin with visibility, and that the ink depletion can be detected by visually recognizing the ink guide pipe for an ink depletion sign from the ink occlusion element through a visible part formed in the barrel. Thus the problem with the unintentional indication of the ink depletion sign due to the growth of air bubbles resulting from the ink freezing, can be solved by treating the ink guide pipe main body or the surroundings of the ink guide pipe so as to provide the former with a heat insulating effect. PCOPYRIGHT: (C)2007,JPO&INPIT