Patent ID: 8622530

Claim:
An ink tank mounted to a recording apparatus including a recording head configured to eject ink and a sub-tank arranged to reserve the ink supplied to the recording head, the ink tank comprising: an ink supply connection port connected to a main body of the recording apparatus configured to supply ink to the main body when the ink tank is mounted to the recording apparatus; a first ink reservoir configured to reserve the ink supplied to the sub-tank; a first ink delivery passage configured to supply the ink reserved in the first ink reservoir to the ink supply connection port; a one-way valve disposed in the first ink delivery passage, wherein the one-way valve enables the ink to move from the first ink reservoir to the ink supply connection port; a second ink reservoir configured to reserve the ink returned from the sub-tank; and a second ink delivery passage configured to supply the ink reserved in the second ink reservoir to the ink supply connection port, wherein the second ink delivery passage joins with the first ink delivery passage at a position between the one-way valve and the ink supply connection port, and wherein the one-way valve forces ink flow from the sub-tank to the second ink reservoir via the second ink delivery passage.