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Abstract

An optical fingerprint acquisition apparatus using a prism, which can improve the quality of a fingerprint image acquired by an image sensor, is provided. The optical fingerprint acquisition apparatus using the prism includes a pentagon prism including an input face 11 which receives a beam, a first support face 12 which is extended from one end of the input face 11, a contact face 13 which is obliquely extended from one end of the first support face 12 at a first tilt angle a1 and is horizontal to the input face 11, a second support face 14 which is extended from one end of the contact face 13, and an output face 15 which is vertically extended from one end of the second support face 14 and extended from another end of the input face 11, wherein, when the beam illuminated to the input face 11 is illuminated to the contact face 13 with which a finger F contacts, the beam is scattered in ridges F1 of fingerprint and is reflected in valleys F2 of fingerprint and thereby illuminated to the output face 15, a light source 20, an imaging lens 30, and an image sensing unit 60 including a lens unit 40 which is provided to receive the beam illuminated to the imaging lens 30 so as to correct a distortion of the beam and prevent an undesired beam, and a sensor unit 50 which includes an image sensor 53 to receive the illuminated beam and thereby acquire a fingerprint image at a second tilt angle a2.

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First Claim