| 摘要 |
An image reading device 1 includes: a diffuser 5 for resting a finger 6 on its upper surface and for diffusing light entering from its lower surface; a light source 11 for irradiating the finger 6 rested on the diffuser 5 with light from the lower surface of the diffuser 5 at a predetermined angle of irradiation; a mirror 13 for receiving the light reflected from the finger 6 on the diffuser 5 which has been emitted from the light source 11; a CCD 12 for, by receiving the light reflected with the mirror 13, capturing an image of the finger 6 on the diffuser 5 in a horizontal scanning direction from the lower surface of the diffuser 5, and then outputting an image signal; and a motor 25 for moving, in a vertical scanning direction, a reading unit 3 which includes at least the light source 11, the mirror 13, and the CCD 12. The upper surface of the diffuser 5 on which the finger 6 is rested is set to be a diffusion surface, and the lower surface of the diffuser 5 through which the light from the light source 11 enters is set as a non-diffusion surface. |
