Fingerprint imaging device with fake finger detection
First Claim
Patent Images
1. An imaging device comprising:
- an optical plate made of an optically transparent material and forming a surface to receive a finger;
a first light source positioned to illuminate the finger receiving surface;
an imaging system positioned to receive light collected from the finger receiving surface and to form an image of a fingerprint pattern of a finger on the finger receiving surface; and
a second light source to direct a light beam to the finger receiving surface to determine whether an object on the finger receiving surface is real or fake.
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Accused Products
Abstract
A fingerprint imaging device includes an optical plate having a finger receiving surface for creating an image of a fingerprint pattern. The fingerprint pattern is illuminated with light from an illuminating tool to create imaging light rays. The imaging light rays from the fingerprint pattern are received by an imaging lens that projects an image of the fingerprint pattern to an image sensor. Another light source is provided to project a light beam onto finger receiving surface. This light source is used to determine whether an object on the finger receiving surface is real or fake.
96 Citations
27 Claims
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1. An imaging device comprising:
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an optical plate made of an optically transparent material and forming a surface to receive a finger;
a first light source positioned to illuminate the finger receiving surface;
an imaging system positioned to receive light collected from the finger receiving surface and to form an image of a fingerprint pattern of a finger on the finger receiving surface; and
a second light source to direct a light beam to the finger receiving surface to determine whether an object on the finger receiving surface is real or fake. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19)
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17. An imaging device comprising:
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an optical plate made of an optically transparent material and forming a surface for receiving a finger;
a first light source positioned to illuminate the finger receiving surface;
a second light source to direct a light beam toward the finger receiving surface to form an image of limited area at or near the finger receiving surface; and
an imaging system positioned to receive light from the finger receiving surface and to form an image of a fingerprint pattern of a finger on the finger receiving surface, the imaging system configured and operable to locate the position of the image formed by the second light source along an axis of the finger receiving surface and to compare that position to a predetermined reference value to determine whether an object on the finger receiving surface is real or fake.
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20. An imaging device comprising:
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an optical plate made of an optically transparent material and forming a surface for receiving a finger;
a light source to direct light to the finger receiving surface to form an image of limited size at or near the finger receiving surface to determine whether an object on the finger receiving surface is real or fake; and
an imaging system positioned to receive light collected from the finger receiving surface to locate the position of the image formed by the light source along an axis of the finger receiving surface and to compare that position to a predetermined reference value to determine whether an object on the finger receiving surface is real or fake. - View Dependent Claims (21)
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22. An imaging device comprising:
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an optical plate made of an optically transparent material and forming a surface for receiving a finger;
a first light source positioned to illuminate the finger receiving surface;
a second light source to direct a light beam toward the finger receiving surface to form an image of limited area at or near the finger receiving surface; and
an imaging system positioned to receive light from the finger receiving surface and to form an image of a fingerprint pattern of a finger on the finger receiving surface, the imaging system including means for locating the position of the image formed by the second light source along an axis of the finger receiving surface and comparing that position to a predetermined reference value to determine whether an object on the finger receiving surface is real or fake. - View Dependent Claims (25, 26, 27)
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23. A method of imaging a fingerprint, the method comprising:
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receiving an object at a finger receiving surface of an optical plate made of an optically transparent material;
illuminating the finger receiving surface with a light source to form an image of limited size at or near the finger receiving surface;
collecting light from the finger receiving surface; and
receiving the collected light at an imaging system to locate the position of the image along an axis of the finger receiving surface and to compare it to a predetermined reference value to determine whether the object on the finger receiving surface is a real or fake.
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24. A method of imaging a fingerprint, the method of comprising:
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receiving an object at a finger receiving surface of an optical plate made of an optically transparent material;
illuminating the finger receiving surface with a first light source to form an image of limited size at or near the finger receiving surface;
collecting light from the finger receiving surface;
receiving the collected light at an imaging system to locate the position of the image along an axis of the finger receiving surface and to compare it to a predetermined reference value to determine whether the object on the finger receiving surface is a real or fake;
if the object on the finger receiving surface is determined to be real, turning off the first light source and turning on a second light source to illuminate the finger receiving surface;
collecting light from the finger receiving surface; and
receiving the collected light at an imaging system to form an image of a fingerprint pattern of a finger based on the received light.
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Specification