| 摘要 |
<p>PURPOSE:To provide a light transmission type developer existence detector which easily prevents dust from sticking to a detecting element without costing so much and prevents detecting accuracy from being deteriorated while maintaining a merit that developer can be used up to the last. CONSTITUTION:In an image forming device constituted so that the optical axis S of light radiated from a light emitting element (not shown in the figure) to a light receiving element 16 and a carrying path for a recording material P are crossed, the light receiving element 16 is attached to the frame of an image forming device main body, and a dust sticking preventing cover 32 formed out of a transparent (light transmissible) material is attached so as to cover the element 16.</p> |
