| 摘要 |
<p>A user enters his personal number on a keyboard (14) and places his finger within a window in a disc (16) on a prism (111). A photo-sensor (13a, 13b) senses the presence of the finger. The pattern illuminated by a lamp (112) is scanned by a camera (113) and processed to check the fingerprint against stored records. When the finger is removed, a motor (17) rotates the disc (16) 360 DEG to cause a first cleaning pad, which is moistened by a spray device (21), followed by a second cleaning pad, both on the underside of the disc (16), to wipe over the surface of the prism (111). </p> |
