Apparatus for imaging fingerprint using transparent optical means having elastic material layer
First Claim
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1. Apparatus for optically imaging a fingerprint, comprising:
- a transparent optical means;
an elastic layer being provided on a surface of said transparent optical means, said elastic layer being of sufficient elasticity to substantially eliminate any hollow between a finger ridge and a surface of said elastic layer on which the finger is pressed;
a light source which directs light towards said elastic layer through said transparent optical means, said light source being arranged such that light emitted therefrom is totally internally reflected at said surface of said elastic layer which are not in contact with the finger ridges; and
a light detector which receives light rays totally internally reflected from the said surface of said elastic layer.
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Abstract
In order to obtain a clear surface pattern of an object such as a fingerprint impression and the like, a surface of an optical element against which the object is impressed is made of an elastic and/or viscous material. Thus, a surface pattern with high contrast is available even if the surface to be imaged is dry.
40 Citations
4 Claims
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1. Apparatus for optically imaging a fingerprint, comprising:
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a transparent optical means; an elastic layer being provided on a surface of said transparent optical means, said elastic layer being of sufficient elasticity to substantially eliminate any hollow between a finger ridge and a surface of said elastic layer on which the finger is pressed; a light source which directs light towards said elastic layer through said transparent optical means, said light source being arranged such that light emitted therefrom is totally internally reflected at said surface of said elastic layer which are not in contact with the finger ridges; and a light detector which receives light rays totally internally reflected from the said surface of said elastic layer. - View Dependent Claims (2)
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3. Apparatus for optically imaging a fingerprint, comprising:
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a transparent optical means; an elastic layer being provided on a surface of said transparent optical means, said elastic layer being of sufficient elasticity to substantially eliminate any hollow between a finger ridge and a surface of said elastic layer on which the finger is pressed; a light source which directs light towards said elastic layer through said transparent optical means, said light source being arranged such that light emitted therefrom is totally internally reflected at said surface of said elastic layer which are not in contact with the finger ridges; and a light detector which receives light scattered at the finger ridges. - View Dependent Claims (4)
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Specification
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Current AssigneeNEC Corporation
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Original AssigneeNEC Corporation
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InventorsOhta, Naoya
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Primary Examiner(s)McGraw, Vincent P.
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Application NumberUS07/576,200Time in Patent Office568 DaysField of Search356/71, 382/4US Class Current356/71CPC Class CodesA61B 5/1172 using fingerprintingG06V 40/1324 by using geometrical optics...
