| 摘要 |
PURPOSE:To improve diffusion effect of light and detect the remaining quantity of developer well without interfering the movement of the developer by letting part of the receiving tray near the developing roller enter in concave form between light emitting element and photo detector by making use of light diffusing material. CONSTITUTION:A receiving plate 31c which forms the developer receiving tray 31 near developing roller 22 is formed of styrene resin or the like of milky white color of high light diffusivity and a pair of containing parts 35, 36 for accommodating the containing chambers 39a, 39b which contain light emitting element and photo detector are provided on an element unit 34 provided to a substrate 38. With this constitution, the recess 37 which the containing parts 35, 36 of the receiving plate 31c forms enters between the light emitting element and photo detector, thereby improving light diffusion effect. At the same time, the developer does not stagnate in the recess 37 and therefore its movement is not hampered and the optical detection of the remaining quantity of the developer may be well accomplished. |
