Patent ID: 8777342

Claim:
An ink container integrally formed with a head that discharges ink and rotatable in a rotation direction to take a first position where the ink is discharged from the head and a second position different from the first position where a position of the head for the first position is different from the position of the head for the second position, comprising: an ink reservoir that contains the ink to be discharged from the head; a first detecting sensor and a second detecting sensor to be connected to a detecting unit that determines whether the ink reservoir contains a predetermined amount of the ink based on a current flowing through the first detecting sensor and the second detecting sensor, the first detecting sensor and the second detecting sensor being provided to face directions different from each other such that whether the ink reservoir contains a first predetermined amount of the ink for the first position is determined based on whether the first detecting sensor contacts the ink when the ink container takes the first position, and whether the ink reservoir contains a second predetermined amount of the ink for the second position is determined based on whether the second detecting sensor contacts the ink when the ink container takes the second position; a first electrode and a second electrode provided at respective surfaces of the ink reservoir, wherein the respective surfaces at which the first and second electrodes are provided are adjacent to each other along the rotation direction of the ink container; and a valve unit, to release air in the ink reservoir, provided at a corner between the adjacent surfaces of the ink reservoir, wherein the valve unit is disposed between the first and second electrodes along the rotation direction of the ink container.