| 摘要 |
<p>The present invention is an authentication device that has a prism body, an imaging unit, and a visible-light light source that illuminates a body part with visible light. The prism body is provided with the following: a body-part contact surface that makes contact with the aforementioned body part; a reflecting surface that shares an edge with the body-part contact surface and reflects, via total internal reflection, light from concavities in the body part and light from convexities on the body part; and an imaging surface that faces the body-part contact surface and shares an edge with the reflecting surface. The imaging surface is provided at an angle whereby light from the body-part concavities does not reach the imaging surface but light reflected by the reflecting surface via total internal reflection and light from the body-part convexities can pass through the imaging surface. The imaging unit images the light that passes through the imaging surface, namely the light from the body-part convexities and the light, reflected by the reflecting surface, from the body-part concavities and convexities.</p> |
