METHOD OF REFILLING INK, INK CARTRIDGE, AND METHOD OF MANUFACTURING THE INK CARTRIDGE

摘要

PROBLEM TO BE SOLVED: To solve such a problem that when an ink cartridge is being refilled with ink, a status of the filling of the ink cannot be checked.SOLUTION: A method of refilling ink is for refilling an ink cartridge 1 with ink. The ink cartridge 1 is provided with a prism unit 40 used to optically detect an amount of ink stored in the ink cartridge 1 and the ink is refilled from a position where the prism unit 40 is provided.