| 摘要 |
PROBLEM TO BE SOLVED: To reduce color shift by arranging temperature detection means at a proper position in an optical scanner.SOLUTION: An image formation device comprises: a photosensitive drum 50Y; a photosensitive drum 50Bk; a light source 807; a rotary polygon mirror 42; optical lenses 60a, 60c; an optical box 105; a thermistor 70 which is arranged in the optical box 105 on the side opposite to a light source unit 61 with respect to the rotary polygon mirror 42 in the scanning direction of the optical beam deflected by the rotary polygon mirror 42, arranged between the optical lens 60c and the optical lens 60a in the optical axis direction of the optical lens 60c and the optical lens 60a, and detects the temperature in the optical box 105; and an ASIC 804 which controls the light source unit 61 on the basis of the detection result of the thermistor 70.SELECTED DRAWING: Figure 10 |
