| 摘要 |
PROBLEM TO BE SOLVED: To reduce a space occupied by an exposure part.SOLUTION: An image formation device of the present invention includes: a photoreceptor drum 12; and an LPH 14 for exposing the photoreceptor drum 12 and having a plurality of light-emitting chips arranged in a direction along a rotary shaft of the photoreceptor drum 12, a holder for holding the plurality of light-emitting chips, and a second rib 141b and a third rib 141c respectively provided at positions sandwiching the plurality of light-emitting chips in the holder. When the photoreceptor drum 12 is mounted inside a housing 90, the second rib 141b and the third rib 141c are brought into contact with the photoreceptor drum 12 to move the LPH 14 in a direction separating from the photoreceptor drum 12 along an optical axis of the LPH 14, and the LPH 14 and the photoreceptor drum 12 are positioned to each other by the contact. |
