| 摘要 |
PURPOSE:To prevent a trace of a toner quantity detecting surface generating in an image by making the distance between a developer carrier and a developer quantity restricting surface different from the distance between a developing carrier and a detecting surface of a toner density detecting means. CONSTITUTION:The developer quantity restricting member 8 is provided near a sleeve 1 in a developer containing part 12, and on the same surface side as that of a restricting surface 8a, a translucent detecting surface member 13 is attached. Then the distance between the sleeve 1 and the developer quantity restricting member restricting surface 8a is made different from the distance between the sleeve 1 and the toner quantity detecting surface 13, and the toner quantity detecting surface 13 is brought closer to the sleeve 1. That is, the influence to the developer on the sleeve from the developer quantity restricting member 8 is made smaller by taking it away from the toner quantity detecting surface 13. Thus, even with developer quantity restricting member 8 and the toner quantity detecting window 13 of differing material and surface characteristics, by changing the distance from the sleeve 1, an image of good quality can be obtained stably over a long period of time without generating any unevenness in density of the image. |
