EP0194783A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Uneven-surface data detection apparatus
Assignee: Fujitsu Ltd
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Filing: 1986-02-28
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Granted: —
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Expires: 2006-02-28
Abstract
Abstract An uneven-surface data detection apparatus, e.g. for detecting fingerprints, comprising at least: a transparent plate (1) having an uneven-surface contact portion (1 a) against which an uneven surfaced (7) to be detected is pressed; a light source (2) for illuminating the uneven-surface contact portion (1a) through the transparent plate (1); an uneven-surface image-drawing-out optical element (31) for drawing out light (17), reflected from projection-facing portions of the uneven-surface contact portion, from the transparent plate - (1); and a detector (4) for detecting the light (17) drawn out from the transparent plate (1) by the optical element (31). Light (17) reflected by a projection (9)-facing portion of the uneven surface contact portion (1a) to be introduced into the detector (4) is diverged from a propagation direction of light reflected by a recess (5)-facing portion of the uneven surface contact portion (1a). The optical element (31) is arranged to guide the light reflected by the projection-facing portion into the detector (4).
Inventors
- 👤 Shin Eguchi
- 👤 Seigo Igaki
- 👤 Hironori Yahagi
- 👤 Fumio Yamagishi
- 👤 Hiroyuki Ikeda
- 👤 Takefumi Inagaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 08:02
CPC Classifications
G; G06; G06V; G06V40/00; G06V40/10; G06V40/12; G06V40/13; G06V40/1324; G06F; G06F18/00; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G06V40/40; G07; G07C; G07C9/00; G07C9/30; G07C9/32; G07C9/37; G02B6/35; G02B6/351; G02B6/3522
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
141 words
An uneven-surface data detection apparatus, comprising at least: a transparent plate having an uneven-surface contact portion against which an uneven surface to be detected having recesses and projections is to be pressed; a light source for illuminating said uneven-surface contact portion through said transparent plate; an uneven-surface image drawing out optical element for drawing out the light reflected on said uneven-surface contact portion from said transparent plate; and a detector for detecting the light drawn out from said transparent plate by said optical element, wherein light reflected by a projection-facing portion of said uneven surface contact portion to be introduced into said detector will be diverged from a propagation direction of light reflected by a recess-facing portion of said uneven surface contact portion, and said optical element is arranged to guide the light reflected by said projection-facing portion into said detector.
Claim 2
Dependent Claim
141 words
An uneven-surface data detection apparatus, comprising at least: a transparent plate having an uneven-surface contact portion against which an uneven surface to be detected having recesses and projections is to be pressed; a light source for illuminating said uneven-surface contact portion through said transparent plate; an uneven-surface image drawing out optical element for drawing out the light reflected on said uneven-surface contact portion from said transparent plate; and a detector for detecting the light drawn out from said transparent plate by said optical element, wherein light reflected by a projection-facing portion of said uneven surface contact portion to be introduced into said detector will be diverged from a propagation direction of light reflected by a recess-facing portion of said uneven surface contact portion, and said optical element is arranged to guide the light reflected by said projection-facing portion into said detector.
Claim 3
Dependent Claim
107 words
An apparatus according to claim 1, wherein when in use said uneven-surface contact portion is illuminated with light at an illumination angle smaller than a critical angle so as not to totally reflect the light; part of the light scattered by said projection is totally reflected at least once in said transparent plate so as to propagate through said transparent plate in a direction of said optical element; and light, which passes through said transparent plate, illuminates said recess and is scattered thereby, re-enters said transparent plate to be discharged outside therefrom at a lower surface thereof, thereby discriminating the scattered light from the totally reflected light
Claim 4
Dependent Claim
15 words
An apparatus according to claim 1 or 2, wherein said optical element is a hologram.
Claim 5
Dependent Claim
15 words
An apparatus according to claim 1 or 2, wherein said optical element is a prism.
Claim 6
Dependent Claim
24 words
An apparatus according to claim 1,2,3, or 4, wherein when in use said light source substantially vertically illuminates said uneven-surface contact portion from below.
Claim 7
Dependent Claim
65 words
An apparatus according to claim 1,2,3, or 4 wherein when in use said light source illuminates said uneven-surface contact portion through said transparent plate at an angle falling within a range of -38° to +33° with respect to the upper surface of said plate, assuming that a vertical direction is represented by 0° and a direction toward said optical element is represented by negative angles.
Claim 8
Dependent Claim
125 words
An apparatus according to claim 1, wherein a hologram is arranged on the lower surface of said transparent plate such that said uneven-surface contact portion may be illuminated with light at an illumination angle smaller than a critical angle so as not to totally reflect light; part of light scattered by said projection will be guided from the lower surface of said transparent plate so as not to be totally reflected but to be diffracted in a direction of said detector; and said hologram being arranged such that light which passes through said transparent plate, will illuminate said recess and be scattered thereby, to re-enter said transparent plate and be diffracted by the lower surface thereof in a direction other than that of said detector.
Claim 9
Independent Claim
26 words
An apparatus according to any preceding claim, wherein said light source is an LED which is arranged illuminate said uneven-surface contact portion through a Lippmann hologram.
Claim 10
Independent Claim
31 words
An apparatus according to any preceding claim, wherein a dust cover is arranged on at least one of the upper and lower surfaces of said transparent plate on an air layer.
Claim 11
Independent Claim
26 words
An apparatus according to any preceding claim, wherein an elastic member is arranged on the upper surface of said uneven-surface contact portion of said transparent plate.
Claim 12
Independent Claim
56 words
An apparatus according to any preceding claim, wherein said apparatus is coupled to data verification means of a personal verification system together with a data verification dictionary, and said apparatus comprises bio-detecting means for discriminating if an uneven surface to be detected is a living body, said bio-detecting means being coupled to said data verification means.
Claim 13
Dependent Claim
77 words
An apparatus according to claim 11, wherein said bio-detecting means comprises: first photodetecting means for detecting visible light at a short wavelength of 440 to 580 nm; second photodetecting means for detecting light at a wavelength longer than 630 nm; reference voltage generating means for generating a reference voltage in response to an output voltage from said second photodetecting means; and comparing means for comparing the reference voltage with an output voltage from said first photodetecting means.
Claim 14
Independent Claim
122 words
An apparatus according to any preceding claim, wherein said optical element is a hologram; and a cylindrical lens (CL1) for focusing a virtual image focused at a vertical focal point (Fh) and a cylindrical lens (CL2) for focusing a virtual image focused at a horizontal focal point - (Fv) are arranged at a position opposite to said hologram to be orthogonal to each other; and said cylindrical lens (CL1) nearer said hologram has an axis (c) parallel to an expansion direction of the virtual image at the horizontal focal point (Fh) due to aberration, and the cylindrical lens (CL2) has an axis (c) parallel to an expansion direction of the virtual image at the vertical focal point - (Fv) due to aberration.
Claim 15
Dependent Claim
66 words
An apparatus according to claim 13, wherein said hologram is produced by interference of plane waves, and a combination of said two cylindrical lenses (CL1, CL2) satisfies a relation: dz = ((Mi + 1) 2 /M1)f1 -((M2 + 1) 2 /M2)f2 where f1 and f2 are focal lengths of respective cylindri cat lenses, M1 is lateral magnification, M2 is longitudinal magnification, and dz is astigmatic difference.
Claim 16
Dependent Claim
40 words
An apparatus according to claim 13 or 14, wherein spatial filters each parallel to the axes (c) of said cylindrical lenses (CL1, CL2) are arranged at focal points of said cylindrical lenses (CL1, CL2) so as to eliminate image blurring.
Claim 17
Dependent Claim
52 words
1 6. An apparatus according to any preceding claim, wherein said optical system comprises a plurality of holograms provided on said transparent plate, and said holograms are arranged to be separated from said uneven-surface contact portion at equal distances, so that a plurality of identical uneven-surface data are obtained through said holograms.
Claim 18
Dependent Claim
55 words
An apparatus according to claim 1, wherein in use, the light illuminates said uneven-surface contact portion at an illumination angle larger than a critical angle to be totally reflected and is scattered at a projecting portion, and wherein scattered light, which propagates in a direction different from the illumination direction, is detected by said detector.
References Cited (Backward Citations)
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