| 摘要 |
<p>ABSTRACT
A finger (2) whose print is to be checked is pressed on to an internally-reflecting face (12) of a prism (1), into which light from a source (3) is directed through a second face (11) so as to be reflected out through a third face (13) to a scanning camera (4). Various forms of guide are described for ensuring that the finger is aligned with its length parallel to the corner (14) at the intersection of the faces (11, 13) through which the light enters and leaves. This improves the image by avoiding blurring of the end portions thereof. </p> |
