| 摘要 |
A device incorporated in image forming equipment for sensing the density of a reference toner image formed on a photoconductive element by illuminating the toner image by light issuing from a light emitting element, and causing the light reflected from or transmitted through the toner image to reach a light-sensitive element whose output is representative of the amount of incident light. The device has a first and a second restricting arrangements for intercepting a part of the light issuing from the light emitting element and a part of the light directed toward the light-sensitive element, respectively. The first and second restricting arrangements each has a restriction close to the associated light emitting or light-sensitive element and a restriction remote from the same. In each restricting arrangement, the restriction close to the light emitting or light-sensitive element has a smaller diameter than the restriction remote from the same. |
