| 摘要 |
<P>PROBLEM TO BE SOLVED: To expand a range for detecting the amount of adhesion of a body for preventing light existing on an object to be irradiated for regularly reflecting light from being reflected regularly with improved sensitivity as compared with before. <P>SOLUTION: A P sensor 30 receives, with a light-receiving element 32, regular reflection light when incident light from a light-emitting element 31 is regularly reflected on the surface of a photoreceptor drum, and detects the amount of toner adhesion on the photoreceptor drum. The P sensor is composed so that the angle between the center line of an incident light path immediately before the incident light from the light-emitting element reaches the surface of the photoreceptor drum, and the center line of a regular reflection light path immediately after reflection by the photoreceptor drum becomes 25°or smaller. Thus, the area of the photoreceptor drum surface section that does not contribute to the regular reflection light received by the light-receiving element can be brought fully closer to the area of the photoreceptor drum surface section that the toner adhering on the photoreceptor drum surface actually occupies. Accordingly, even a large amount of toner adhesion can be detected with sufficient sensitivity. <P>COPYRIGHT: (C)2009,JPO&INPIT |
