| 摘要 |
PROBLEM TO BE SOLVED: To prevent the fluctuation of the light quantity of an element caused by generated heat from a light emitting element and the positional deviation of the light emitting element caused by the thermal deformation of an exposing element by providing a supporting member which is a hollow member with a heat radiating member inside. SOLUTION: The supporting member 20 is arranged on the inside of a photoreceptor drum 10 so that its center axis is aligned with the center axis of the drum 10 in a state where it holds an exposure optical system 12 of every color provided with a fin F1 being the heat radiating member which is aligned with the optical system 12 inside the member 20. Therefore, image exposure is performed by the optical system 12 perpendicularly to the center shaft of the drum 10. The optical system 12 provided with the fin F1 is attached to the member 20 for which a pipe-like hollow member is used and housed inside the base substance of the drum 10. A lead wire WA from an LED of every color, which is led out from the base plate of the optical system 12 and connected to a connector C attached to the lower part of a metallic casing, is disposed inside the member 20 through an insertion hole H1. |
