Optical imaging device suitable for forming images of...

Details Optical imaging device suitable for forming images of... Optical imaging device suitable for forming images of...

2004-11-10

2009-12-01

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

Document pattern analysis or verification

C356S445000

Reexamination Certificate

active

07626687

ABSTRACT:
An optical imaging device for forming optical images of fingerprints of a finger, the device comprising: an optical plate having a portion at one end of a main face that is provided for illuminating the finger through the plate, the reflected light beam propagating with multiple reflections inside the plate to the other end thereof, which end presents an inclined end face; a focusing lens facing the end face with the lens having its axis situated in the midplane of the plate; and a mirror for directing the light beam leaving the end face onto the axis of the lens.

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Seigo Igaki et al. “Holographic Fingerprint Sensor” Fujitsu-Scientific and Technical Journal, Fujitsu Limited. Kawasaki, JP vol. 25, No. 4, Dec. 21, 1989, pp. 287-296, XP000103957, figures 11, 17.
D. Maltoni et al.: “Handbook of Fingerprint Recognition” Jun. 2003, Springer New York, USA XP002320999, 2.4 Live-scan Fingerprint Sensing p. 59-p. 64.
Eguchi S. et al. “Holographic Fingerprint Sensor” Proceedings of the Spie, Spie, Bellingham, VA, US, vol. 1051, Jan. 17, 1989, pp. 129-134, XP000671921 Figures 1, 5.

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