Patent ID: 7470012

Claim:
A liquid storage container comprising: a liquid reservoir adapted to store a liquid therein; a first spring member accommodated within the liquid reservoir and urging the liquid reservoir so as to maintain the interior of the liquid reservoir at a negative pressure; a casing having a wall and accommodating the liquid reservoir therein; a supply port formed on the wall of the casing and facilitating supplying the liquid in the liquid reservoir to the outside; a stress damping unit provided between the liquid reservoir and the wall of the casing, the stress damping unit damping stress applied to the liquid reservoir, wherein the stress damping unit is connected to the liquid reservoir in series in an expansion/contraction direction of the first spring member, wherein the stress damping unit includes a second spring member arranged within the air chamber in the expansion/contraction direction of the first spring member in series therewith, and the container further comprising: a shape-memory alloy wire expanding/contracting by electric energy and being arranged within the casing so as to constrain the second spring member in a direction in which the stress damping unit contracts; and an electric contact unit arranged outside the casing and connected to both ends of the shape-memory alloy wire.