Patent ID: 8136930

Claim:
An ink container detachably mountable to a mounting portion of an ink jet printer including an apparatus contact provided in the mounting portion and a light receptor configured to obtain light reception information used for discriminating properness of position of the ink container mounted in the mounting portion, said ink container comprising: a memory configured to store discrimination information of the ink container; a container contact electrically connectable to the apparatus contact provided in the mounting portion; a light emitting portion configured to emit light; a controller configured to control light emission of the light emitting portion, based on individual information corresponding to the ink container, supplied through the container contact from the apparatus contact, and the discrimination information stored in the memory; and a light guide member having a light incident portion into which the light emitted from the light emitting portion is entered and a light emergence portion, the light guide member configured to guide the light entered from the light incident portion to the light emergence portion so as to cause the light receptor to receive the light emerged from the light emergence portion.