| 摘要 |
PROBLEM TO BE SOLVED: To provide an ink tank capable of detecting a quantity of residual ink in a stable operation at low cost. SOLUTION: A prism 20 of the ink tank reflects an incident light from the outside to the outside when a liquid is not in a liquid chamber and does not reflect the light when the liquid is in the liquid chamber. The prism 20 has an optical characteristic in the equal level of that of a rectangular solid, having a thickness of 1.7 mm and a square shaped cross section of which one side is 40 mm, in which the all-light ray transmission factor measured by a regulation of JIS K7136 is not less than 80%, and the haze value is not less than 75% and not greater than 85%. COPYRIGHT: (C)2005,JPO&NCIPI |
