Patent ID: 8172380

Claim:
A liquid discharge apparatus comprising a discharge head that discharges a first liquid supplied via a liquid supply tube from a liquid tank, wherein the liquid tank has a first liquid reservoir chamber that stores the first liquid and a second liquid reservoir chamber that stores a second liquid whose solvent is the same as that of the first liquid and whose concentration is lower than that of the first liquid, the liquid tank is partitioned by a partition wall that partitions an inside into the first liquid reservoir chamber and the second liquid reservoir chamber, and at least a part of the partition wall comprises a permeable film which has liquid permeability and which allows a solvent for the second liquid stored in the second liquid reservoir chamber to pass therethrough and enter the inside of the first liquid reservoir chamber via the part of the partition wall, wherein the concentration of the second liquid is set to a concentration in which the solvent for the second liquid permeates the inside of the first liquid reservoir chamber via the partition wall due to a concentration difference between the first liquid and the second liquid.