Optical device for biometric capture by contact and system...

Details Optical device for biometric capture by contact and system... Optical device for biometric capture by contact and system...

2005-06-22

2009-08-18

Valentin, Juan D (Department: 2877)

Optics: measuring and testing

Document pattern analysis or verification

Reexamination Certificate

active

07576843

ABSTRACT:
An optical device for biometric sensing by contact, comprising: an optical element (2) having a face (3) constituting a surface for apposition of a body part from which a biometric characteristic is to be sensed; a radiation source (6) for illuminating the face (3) of the optical element; and sensor means (9) for picking up the radiation coming from the face (3); the face (3) is coated in a thin layer defining a pattern and made of a material such that in association with the material constituting the optical element, the layer is transparent in the presence of radiation emitted by the radiation source (6) when a body part is placed on the face (3) and is significantly less transparent in the presence of external parasitic radiation (13) that is inclined relative to the face (3); whereby the image received by the sensor means can be distinguished depending on whether it is real or latent.

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