Patent EP0304092A1 successfully refreshed from Google Patents.
EP0304092A1
Expired / Lapsed
EP
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Apparatus for imaging surface pattern such as fingerprint
Assignee: NEC Corp
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Filing: 1988-08-22
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Granted: —
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Expires: 2008-08-22
Abstract
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.
Inventors
- 👤 Naoya C/O Nec Corporation Ohta
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 10:27
CPC Classifications
G; G06; G06V; G06V40/00; G06V40/10; G06V40/12; G06V40/13; G06V40/1324; A; A61; A61B; A61B5/00; A61B5/117; A61B5/1171; A61B5/1172
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
Apparatus for imaging surface pattern of an object, comprising: a transparent optical means having a surface against which the object to be examined is impressed, said surface being made of an elastic and/or viscous material; a light source which directs light towards said surface of said transparent optical means; and a light detector which receives light reflected from said surface of said transparent optical means.
Claim 2
Dependent Claim
65 words
Apparatus for imaging surface pattern of an object, comprising: a transparent optical means having a surface against which the object to be examined is impressed, said surface being made of an elastic and/or viscous material; a light source which directs light towards said surface of said transparent optical means; and a light detector which receives light reflected from said surface of said transparent optical means.
Claim 3
Dependent Claim
42 words
Apparatus as claimed in claim 1, wherein said light source is arranged such that light emitted therefrom is totally internally reflected at said surface of said optical means, and wherein said light detector is positioned to receive the totally internally reflected light.
Claim 4
Dependent Claim
12 words
Apparatus as claimed in claim 2, wherein said object is human appendage.
Claim 5
Dependent Claim
26 words
Apparatus as claimed in claim 2 or 3, wherein said transparent optical means has a partial cylindrical cross-section for providing a recess for receiving said object.
Claim 6
Dependent Claim
44 words
Apparatus as claimed in claim 1, wherein said light source is arranged such that light emitting therefrom is refracted at said surface of said optical means, and wherein said light detector is positioned to receive light scattered at said surface of said optical means.
Claim 7
Dependent Claim
12 words
Apparatus as claimed in claim 5, wherein said object is human appendage.
Claim 8
Dependent Claim
26 words
Apparatus as claimed in claim 5 or 6, wherein said transparent optical element has a partial cylindrical cross-section for providing a recess for receiving said object.
References Cited (Backward Citations)
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