Fingerprint-image-forming optical device

Details Fingerprint-image-forming optical device Fingerprint-image-forming optical device

2004-10-13

2009-08-25

Ahmed, Samir A. (Department: 2624)

Image analysis

Applications

Personnel identification

C385S116000, C385S120000

Reexamination Certificate

active

07580550

ABSTRACT:
The invention relates to an optical device which is used to form a fingerprint image. The inventive device comprises an optical plate having a first main face on which a finger is placed, a first side face comprising a converging mirror, and a second side face which is disposed opposite the first side face and which forms an output face, a focusing lens being disposed opposite said output face. According to the invention, the first main face forms an angle greater than 90° with output face, such that: the incidence of light rays on the first main face, inside the optical plate, is increased; the stray radiation at the output face is reduced; and a thinner plate can be used.

REFERENCES:
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patent: 6255641 (2001-07-01), Johnson
patent: 6324020 (2001-11-01), Teng et al.
patent: 6956608 (2005-10-01), Shapiro et al.
patent: 0 348 182 (1989-12-01), None
patent: WO 01/88835 (2001-11-01), None
Hebert R.T., “Off-Axis Optical Elements in Integrated, Injection-Molded Assemblies,” Proceedings of the SPIE, vol. 2600, pp. 129-134, (Oct. 1995).
International Search Report PCT/FR2004/002609; report dated Mar. 29, 2005.

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