| 摘要 |
PROBLEM TO BE SOLVED: To obtain an image having excellent image quality by enhancing supporting rigidity, reducing the resonance frequency of an oscillation frequency band area to be evaded and reducing the vibration of a reflection mirror without causing a remarkable change in a conventional fixed structure. SOLUTION: As for a write-in unit provided with an optical unit 2 having a laser light source part 4 and a polygon motor 5, the reflection mirror reflecting a laser beam 7 radiated by the optical unit 2 to a photoreceptive drum 8 and a frame 1 to hold the optical unit, at least one guide 9 out of a pair of the guides 9 holding both ends of the reflection mirror 3 is installed by having an angle to a direction orthogonal with the longitudinal direction of the reflection surface of the reflection mirror 3. |
