Patent ID: 8840220

Claim:
An ink jet printing apparatus comprising: an ink tank having at least a first light emitting element and a second light emitting element; a carriage to which said ink tank is detachably attached; a light receiving part configured to receive light emitted from the first light emitting element; a determining unit configured to determine whether or not an attachment position of said ink tank is correct, on the basis of a light reception state of said light receiving part, at a time when only light emission from the first light emitting element is controlled; and an informing unit configured to provide information relating to a state of said ink tank based on light emitted from the second light emitting element, at a time when only light emission from the second light emitting element is controlled, wherein a peak sensitivity wavelength range of said light receiving part is within a range of not less than 760 nm and not more than 1100 nm, and wherein a peak emission wavelength of the first light emitting element is not less than 760 nm, and a peak emission wavelength of the second light emitting element is within a range of not less than 400 nm and not more than 760 nm.