Patent ID: 7562952

Claim:
An ink tank having an ink accommodating chamber in which ink is accommodated, and an ink supply port through which the ink in the ink accommodating chamber is supplied to a print head, the ink tank comprising: an ink remaining amount detecting module including; a support substrate having a site which transmits light; nonvolatile information storage means provided on the support substrate and to and from which information can be written and read; a sealing structure provided on the support substrate so as to cover the information storage means and the site transmitting light, the sealing structure transmitting light and being shaped like a prism; and information transmitting means provided on the support substrate to receive external information on the ink remaining amount, write the information to the information storage means, and transmit the information written to the information storage means, to an external device; a housing member constituting an outer wall of the ink accommodating chamber and the ink supply port; wherein the ink remaining amount detecting module is mounted in the housing member so that the sealing structure provided on the support substrate is exposed to the ink accommodating chamber and that another surface on the support substrate is exposed to an outer surface of the housing member.