| 摘要 |
PURPOSE:To accurately detect a toner concentration without using a complex means and to stably obtain an image having excellent gradation properties and high quality at low cost by providing a spacific toner concentration detecting means. CONSTITUTION:A signal (e) is outputted so that the sticking quantities of plural toner sticking pattern images are sequentially increased in the rotational direction of the arrow of a photosensitive body 18. These patterns are irradiated with a light emitting signal (b) outputted from a toner concentration detecting means 113, and a light emitting element 111 carries out the irradiation of these patterns in the same direction as a shaving direction when the basic tube of the photosensitive body is produced, as well. At such a time, a light emitting angle theta0, is larger than a light receiving angle theta1 respect to a normal 115, so that the light receiving element 110 detects scattered/reflected light by the toner sticking pattern. A scattered/reflected light quantity (a) detected by the light receiving element 110 is sent to a toner concentraiton detecting means 113 and outputted to a control part 112. |
