| 摘要 |
PROBLEM TO BE SOLVED: To solve such the problem that it is impossible to enhance joining strength of a film-like member for a head tank while maintaining displacement characteristics of the film-like member.SOLUTION: A head tank 3 includes: a tank case 11 which forms a liquid storage unit 10 for storing liquid, and one surface of which includes an open recess 11a; and a flexible film-like member (hereinafter referred to as "film sheet") 12 which tightly seals the opening of the recess 11a of the tank case 11, and forms the wall surface of the liquid storage unit 10. In the tank case 11, joining parts 14 and 14 projecting inwardly from the outer peripheral part 13 are formed at the longitudinal center of the opposed side portions of the outer peripheral part 13 of the opening of the recess 11a. The joining parts 14 are formed to have a thin plate shape, and can be displaced according to displacement of the film sheet 12 in the state in which the joining parts are joined to the film sheet 12. |
