| 摘要 |
PROBLEM TO BE SOLVED: To substantially uniformize the temperature distribution in a scanning lens even when the temperature of the scanning lens is raised by the heat from a driving motor of a rotating polygon mirror via an optical base. SOLUTION: A heat conductive member 7 is provided in a state that the conductive member is made to contact both of the opposite face 5b of a fitting part, which is the opposite side of the fitting face 5a of the optical base 2 of the scanning lens 5, and a rotating polygon mirror cover 4 which covers the rotating polygon mirror 3. The heat generated from the rotating polygon mirror 3 is conducted to the the fitting face 5a of the scanning lens 5 and to the opposite face 5b of the fitting part through both of the optical base 2 and the heat conductive member 7, and the temperature of the scanning lens is raised uniformly from two faces which are opposite to each other. Thus, the temperature distribution in the scanning lens 5 is uniformized, and the generation of an abnormal image, which occurs when an non-uniform temperature distribution arises between the fitting face 5a side of the fitting part and the the opposite face 5b side in the scanning lens 5, is prevented. COPYRIGHT: (C)2004,JPO&NCIPI |
