| 摘要 |
PROBLEM TO BE SOLVED: To provide a scan line adjustment device capable of reducing the unintended inclination of a long-sized lens unit, without increasing the number of tilt adjustment times of a scan line and to provide an optical scanner and an image forming apparatus.SOLUTION: The scan line adjustment device includes a long-sized lens unit 50 whose attitude with respect to scanned light is changed to change the tilt of the scan line on a light irradiation target irradiated with the light, a support base 66 which supports the long-sized lens unit 50, an adjuster 58 which comes into contact with the long-sized lens unit 50, a driving motor 56 which displaces the adjuster 58, and a first leaf spring 61 and a second leaf spring 62 which energize the long-sized lens unit 50 and adjusts the displacement amount of the adjuster 58 by the driving motor 56, to adjust the attitude of the tilt variation member. A thermal expansion member 70 made of a material whose linear expansion coefficient is larger than that of the adjuster 58 is provided between the long-sized lens unit 50 and the adjuster 58. |
