Ink tank, for ink jet printer, has porous member that is capable of absorbing ink, and which contacts corner portion between reflective faces of right prism

摘要

Air, corresponding in quantity to the ink sucked from foam (6) and into an ink outlet hole, is introduced into a main ink chamber (5) from vent ports. A right prism (52) for detecting ink end is exposed inside an ink reservoir (22) through an opening (202b) of the ink tank (1), and has reflective faces (52a,52b) between which is a corner portion that is contacted by a porous member (40) capable of absorbing ink. An independent claim is also included for an ink jet printer.