| 摘要 |
An image forming device (1) includes an exposure device (an exposure unit (YM) and an exposure unit (CB)) configured to emit exposure light and an air flow generator (an air blowing fan (38)) configured to generate an air flow. The exposure device includes a heat source (a polygon motor (58) and/or a driver IC (59)) that generates heat and a heat sink (72) configured to dissipate the heat. The heat sink (72) includes a plurality of fins (74) located inside the air flow. The plurality of fins (74) extend in a direction parallel to a direction where the air flow flows and are arrayed in a direction orthogonal to the direction where the air flow flows. The plurality of fins (74) are formed so as to increase in height from an upstream side toward a downstream side in the direction where the air flow flows. |
