| 摘要 |
PROBLEM TO BE SOLVED: To prevent attachment of foreign materials without consuming electric power.SOLUTION: An imaging unit 19 comprises an image pickup device 18, the device being a heat source. A black box 17 is disposed between the imaging unit 19 and a photographic lens 13. A heat sheet 35 is tightly attached to the black box 17, the heat sheet 35 transferring the heat generated in the image pickup device 18 to the black box 17. A plurality of fins 26 projecting toward inside are formed on the inner wall of the black box 17, the plurality of fins 26 generating heat convection inside the black box 17 by discharging heat. The heat convection becomes a convection current flowing in the counterclockwise direction and blows against the imaging unit 19. Thus, without consuming electric power, foreign materials and the like floating inside the black box 17 can be prevented from being attached to a transparent substrate 33 disposed in front of the image pickup device 18. |
