| US 7,574,023 B2 | ||
| Fingerprint image pickup device | ||
| Emiko Sano, Tokyo (Japan); Masahiro Shikai, Tokyo (Japan); Akihide Shiratsuki, Tokyo (Japan); Toshiro Nakashima, Tokyo (Japan); and Takahiro Nakamura, Tokyo (Japan) | ||
| Assigned to Mitsubishi Denki Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Sep. 30, 2005, as Appl. No. 11/239,476. | ||
| Claims priority of application No. P2004-290574 (JP), filed on Oct. 01, 2004. | ||
| Prior Publication US 2006/0072796 A1, Apr. 06, 2006 | ||
| Int. Cl. G06K 9/00 (2006.01) | ||
| U.S. Cl. 382—124 [382/126; 356/71; 396/15] | 20 Claims |
| 1. A fingerprint image pickup device comprising:
a light source emitting light along an optical axis for transmission through a fingertip portion having a fingerprint to be
photographed;
an image pickup unit that picks up the light from the light source that is transmitted through the fingertip portion to acquire
a fingerprint image in which a convex part of the fingerprint is dark and a concave part of the fingerprint is bright;
an optical system forming an image of the light from the light source that is transmitted through the fingertip portion to
the image pickup unit; and
a fingertip holding section supporting the fingertip portion tilted at an oblique angle relative to the optical axis, with
a distal end of the fingertip portion farther away from the optical system than a proximal part of the fingertip portion.
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