Contactless type of fingerprint image obtaining apparatus using mirror
View Patent ↗Provided is a contactless fingerprint image obtaining apparatus using a mirror. The contactless fingerprint image obtaining apparatus obtains the entire region of a fingerprint using the mirror in a contactless manner. The entire region of the fingerprint includes a fingerprint region of the front direction coinciding with the optical axis of a single shooting unit, and fingerprint regions of left/right lateral sides that do not coincide with the optical axis. Accordingly, unwillingness of a user, distortion caused by contact of the user, quality reduction, which are the limitations of a related art contact type fingerprint image obtaining apparatus are solved. Simultaneously, a wide region of a fingerprint image including the lateral sides of a fingerprint that cannot be directly obtained by a related art contactless fingerprint image obtaining apparatus using only a single camera can be economically obtained.
1. A contactless fingerprint image obtaining apparatus using a mirror, the apparatus comprising:
a finger support supporting a single finger of a user to prevent the finger from shaking;
a pair of mirrors installed at a slope angle above both lateral sides of the single finger supported by the finger support, one of the mirrors illuminating a region of a fingerprint of the single finger on a left side, the other of the mirrors illuminating a region of the fingerprint of the single finger on a right side;
a single camera fixedly installed apart from the finger by a predetermined distance below the finger supported by the finger support, the single camera being disposed at a position obtaining directly from the single finger an image of a front region of the fingerprint coinciding with an optical axis of the camera and simultaneously obtaining from the mirrors images of left and right lateral sides of the fingerprint that do not coincide with the optical axis;
a lighting unit installed between the finger supported by the finger support and the camera, and illuminating light on the fingerprint region of the user, the lighting unit including a plurality of short wavelength band emission layers circularly arranged around the single finger of the user to illuminate the fingerprint region;
a scattering unit allowing light illuminated by the lighting unit to be uniformly spread and distributed over the finger; and
an operating switch installed in front of the finger supported by the finger support, and on/off-operated by a pressing operation of the finger to on/off-control operations of the camera and the lighting unit.
2. A contactless fingerprint image obtaining apparatus using a mirror, the apparatus comprising:
a finger support supporting a single finger of a user to prevent the finger from shaking;
a pair of mirrors installed at a slope angle above both lateral sides of the single finger supported by the finger support, one of the mirrors illuminating a region of a fingerprint of the single finger on a left side, the other of the mirrors illuminating a region of the fingerprint of the single finger on a right side;
a single camera installed to be movable to left and right, apart from the finger by a predetermined distance below the finger supported by the finger support, the single camera, while moving to left and right, obtaining directly from the single finger an image of a front region of the fingerprint coinciding with an optical axis of the camera and obtaining from the mirrors images of left and right lateral sides of the fingerprint that do not coincide with the optical axis;
a camera moving unit moving the camera to left and right;
a lighting unit installed between the finger supported by the finger support and the camera, and illuminating light on the fingerprint region of the user, the lighting unit including a plurality of short wavelength band emission layers circularly arranged around the single finger of the user to illuminate the fingerprint region;
a scattering unit located above the lighting unit and allowing light illuminated by the lighting unit to be uniformly spread and distributed over the finger; and
an operating switch installed in front of the finger supported by the finger support, and on/off-operated by a pressing operation of the finger to on/off control operations of the camera, the camera moving unit, and the lighting unit.
3. A contactless fingerprint image obtaining apparatus using a mirror, the apparatus comprising:
a finger support supporting a single finger of a user to prevent the finger from shaking;
a pair of mirrors installed at a slope angle above both lateral sides of the single finger supported by the finger support, one of the mirrors illuminating a region of a fingerprint of the single finger on a left side, the other of the mirrors illuminating a region of the fingerprint of the single finger on a right side;
a pair of cameras installed to be movable to left and right, apart from the finger by a predetermined distance below the finger supported by the finger support, one camera being disposed at a position obtaining directly from the single finger an image of a front region of the fingerprint coinciding with an optical axis of the camera and simultaneously obtaining from the mirrors an image of a left lateral side of the fingerprint that do not coincide with the optical axis, and the other camera being disposed at a position obtaining directly from the single finger an image of the front region of the fingerprint coinciding with the optical axis of the camera and simultaneously obtaining from the mirrors an image of a right lateral side of the fingerprint that do not coincide with the optical axis;
a lighting unit installed between the finger supported by the finger support and the pair of cameras, and illuminating light on the fingerprint region of the user, the lighting unit including a plurality of short wavelength band emission layers circularly arranged around the single finger of the user to illuminate the fingerprint region;
a scattering unit located above the lighting unit and allowing light illuminated by the lighting unit to be uniformly spread and distributed over the finger; and
an operating switch installed in front of the finger supported by the finger support, and on/off-operated by a pressing operation of the finger to on/off-control operations of the cameras and the lighting unit.
4. The apparatus of claim 1 , wherein the finger support comes in contact with a front side of the single finger opposite to a back side of the single finger on which a nail of the user is disposed.
5. The apparatus of claim 1 , wherein the scattering unit includes a lower surface facing the lighting unit to receive light illuminated by the lighting unit and an upper surface opposite to the lower surface, the upper surface facing the finger to spread and distribute the light over the finger.
6. The apparatus of claim 2 , wherein the camera moving unit comprises one of a linear motion (LM) guide, a ball screw, and an automatic linear stage.
7. The apparatus of claim 2 , wherein the finger support comes in contact with a front side of the single finger opposite to a back side of the single finger on which a nail of the user is disposed.
8. The apparatus of claim 2 , wherein the scattering unit includes a lower surface facing the lighting unit to receive light illuminated by the lighting unit and an upper surface opposite to the lower surface, the upper surface facing the finger to spread and distribute the light over the finger.
9. The apparatus of claim 3 , wherein the finger support comes in contact with a front side of the single finger opposite to a back side of the single finger on which a nail of the user is disposed.
10. The apparatus of claim 3 , wherein the scattering unit includes a lower surface facing the lighting unit to receive light illuminated by the lighting unit and an upper surface opposite to the lower surface, the upper surface facing the finger to spread and distribute the light over the finger.