Patent ID: 7290869

Claim:
An ink cartridge comprising: a rigid plastic plate; an obverse surface-side ink chamber formed on an obverse surface of the rigid plastic plate; and a reverse surface-side ink chamber formed on a reverse surface of the rigid plastic plate, wherein the obverse surface-side ink chamber is formed by an obverse surface-side recess formed on the obverse surface of the rigid plastic plate and a three-dimensionally molded obverse surface-side flexible plastic film sealing the obverse surface-side recess, and the reverse surface-side ink chamber is formed by a reverse surface-side recess formed on the reverse surface of the rigid plastic plate and a three-dimensionally molded reverse surface-side flexible plastic film sealing the reverse surface-side recess, the obverse surface-side ink chamber and the reverse surface-side ink chamber being formed at positions where at least portions thereof overlap each other with the rigid plastic plate interposed therebetween.