WO2003025844A1 - Optical fingerprint acquisition apparatus - Google Patents

Optical fingerprint acquisition apparatus Download PDF

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Publication number
WO2003025844A1
WO2003025844A1 PCT/KR2002/001719 KR0201719W WO03025844A1 WO 2003025844 A1 WO2003025844 A1 WO 2003025844A1 KR 0201719 W KR0201719 W KR 0201719W WO 03025844 A1 WO03025844 A1 WO 03025844A1
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WO
WIPO (PCT)
Prior art keywords
projecting
primarily
incident
fingerprint
light
Prior art date
Application number
PCT/KR2002/001719
Other languages
French (fr)
Inventor
Jong-Ik Lee
Sung-Hyu Shin
Dong-Won Lee
Original Assignee
Nitgen Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nitgen Co., Ltd. filed Critical Nitgen Co., Ltd.
Priority to JP2003529397A priority Critical patent/JP3782420B2/en
Publication of WO2003025844A1 publication Critical patent/WO2003025844A1/en

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Measuring for diagnostic purposes; Identification of persons
    • A61B5/103Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12Fingerprints or palmprints
    • G06V40/13Sensors therefor
    • G06V40/1324Sensors therefor by using geometrical optics, e.g. using prisms
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00Pattern recognition
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Measuring for diagnostic purposes; Identification of persons
    • A61B5/68Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6813Specially adapted to be attached to a specific body part
    • A61B5/6825Hand
    • A61B5/6826Finger

Definitions

  • the present invention relates to an optical finge ⁇ rint acquisition apparatus, and in particular, to an optical finge ⁇ rint acquisition apparatus capable of reducing an image distortion and a size of an optical system by deforming the shape of a prism.
  • a finge ⁇ rint acquisition apparatus is an apparatus for acquiring finge ⁇ rints applicable to a finge ⁇ rint recognizer, which is employed in personnel airlocks, safe locking devices, access control, diligence and laziness check, computer access control, etc., by comparing an acquired finge ⁇ rint with a user's pre-registered finge ⁇ rint.
  • the finge ⁇ rint acquisition apparatus is roughly classified into an optical type and a non-optical type.
  • An optical finge ⁇ rint acquisition apparatus is an apparatus for irradiating light onto a finge ⁇ rint laid on a prism for forming an image, and reading a finge ⁇ rint image formed on an image sensor after being reflected in accordance with the shape of the valleys or ridges of the finge ⁇ rint so as to be compared with a pre-stored finge ⁇ rint.
  • Fig. 1 shows a mechanism of an typical optical linge ⁇ rint acquisition apparatus.
  • the finge ⁇ rint acquisition apparatus in Fig. 1 represents a "scattering type" finge ⁇ rint acquisition apparatus, which comprises an image forming prism 1, a light source 3, .a condensing lens 4, and an image sensor 5.
  • the light is incident from the light source 3 to a finge ⁇ rint acquisition window 2 of the image forming prism 1 at a pe ⁇ endicular angle or an angle much less than a critical angle. Therefore, the light passes through the finge ⁇ rint acquisition window 2 without reaching the image sensor at the ridges of the finge ⁇ rint that do not reach the finge ⁇ rint acquisition window 2, while the incident light is reflected and scattered from the valleys of the finge ⁇ rint.
  • the scattered light is incident to the condensing lens 4 and detected by the image sensor 5. Accordingly, the amount of light incident from the valleys of a finge ⁇ rint to the image sensor 5 is discriminated from the amount of light incident from the ridges of a finge ⁇ rint to the image sensor 5. As a consequence, the image sensor 5 outputs electric signals of different levels in accordance with the pattern of the finge ⁇ rint.
  • An image processor (not shown in the drawing) defines and processes an output value of the image sensor 5 by a digital signal so as to recognize patterns of the finge ⁇ rint.
  • Japanese Laid-Open Patent Publication No. Hei 2-176984 discloses a method for changing an optical path in diverse manners inside of an image forming prism and a method for correcting an image projected from the image forming prism by using a correction lens and a correction prism.
  • a desirable solution to reduce image distortion while maintaining size of the optical system to be small is to unify the distance (length of the optical path) from any position of the finge ⁇ rint to the image sensor.
  • an object of the present invention to provide an optical finge ⁇ rint acquisition apparatus employing a prism and a reflecting mirror that can unify the distance (length of the optical path) from any position of a finge ⁇ rint to an image sensor to minimize the optical path difference without relying on a lens or a prism for image correction.
  • a finge ⁇ rint acquisition apparatus for acquiring a finge ⁇ rint image by means of light scattered from valleys and ridges of a finge ⁇ rint, the apparatus comprising a prism and a reflecting mirror.
  • the prism comprises: a finge ⁇ rint contacting surface to be touched by a finge ⁇ rint of a person; a totally reflecting surface facing the finge ⁇ rint contacting surface for totally and inwardly reflecting the light scattered from the finge ⁇ rint in contact with the finge ⁇ rint contacting surface; a primarily projecting/re-incident surface linking the finge ⁇ rint contacting surface to the totally reflecting surface for primarily projecting the light totally reflected from the totally reflecting surface so as to be re-incident from outside; and an ultimately projecting surface facing the primarily projecting/re-incident surface for ultimately projecting the light re- incident to the primarily projecting re-incident surface toward outside.
  • the reflecting mirror is installed outside adjacent to the primarily projecting/re-incident surface of the prism so as to correct the optical path difference by reflecting the light projected from the primarily projecting/re-incident surface so as to be re-incident to the primarily projecting/re-incident surface.
  • the prism is preferably shaped rectangular, and each surface thereof preferably has the following relation.
  • Fig. 1 is a diagram illustrating construction of a conventional finge ⁇ rint acquisition apparatus
  • Fig. 2 is a diagram illustrating construction of an optical finge ⁇ rint acquisition apparatus according to the present invention.
  • Fig. 2 shows a finge ⁇ rint acquisition apparatus, including a prism 20 for forming a finge ⁇ rint image by means of light scattered from valleys and ridges of a finge ⁇ rint, a condensing lens 30 and a light source 40, according to an embodiment of the present invention.
  • the prism 20 employed in the embodiment of the present invention is a rectangular prism, comprising: a finge ⁇ rint contacting surface 21 to be touched by a finge ⁇ rint 15 of a person; a totally reflecting surface 22 facing the finge ⁇ rint contacting surface 21 with an angle ⁇ for totally and inwardly reflecting the light scattered from the finge ⁇ rint in contact with the finge ⁇ rint contacting surface 21; a primarily projecting/re-incident surface 23 linking the finge ⁇ rint contacting surface 21 to the totally reflecting surface 22 with an angle ⁇ for primarily projecting the light totally reflected from the totally reflecting surface 22 so as to be re-incident from outside; and an ultimately projecting surface 24 facing the primarily projecting/re-incident surface 23 for ultimately projecting the light re-incident to the primarily projecting/re-incident surface 23 toward outside.
  • the light projected from the ultimately projecting surface 24 is focused on an image sensor (not shown in the drawing) by the condens
  • a reflecting mirror 25 is installed outside adjacent to the primarily projecting/re-incident surface 23 at an angle ⁇ .
  • the reflecting mirror 25 reflects the light projected from the primarily projecting/re-incident surface 23 so as to be re-incident to the prism 20 through the primarily projecting/re-incident surface 23.
  • the light source 40 irradiates light, which passes through the totally reflecting surface 22 of the prism and reaches a frnge ⁇ rint 15 in contact with the finge ⁇ rint contacting surface.
  • a detailed description of the operation of the light source 40 will be omitted here because it is the same as the conventional optical finge ⁇ rint acquisition apparatus.
  • the light scattered from the finge ⁇ rint 15 is first totally and inwardly reflected from the totally reflecting surface 22.
  • the totally reflecting surface 22 is not parallel with the finge ⁇ rint contacting surface 21 but is oblique to have an angle ⁇ therewith. Therefore, the light hit the totally reflecting surface 22 is totally reflected and orients the primarily projecting/re-incident surface 23.
  • the projected light is reflected from the reflecting mirror 25 installed oblique with respect to the primarily projecting/re-incident surface 23, and re-incident thereto.
  • the reflecting mirror 25 is installed with an angle ⁇ so that the light can orient the central portion of the ultimately projecting surface 24.
  • the light reflected from the reflecting mirror 25 and re-incident to the prism 20 is projected outside the ultimately projecting surface 24, and incident to an image sensor (not shown in the drawing) through the condensing lens 30.
  • the angle ⁇ must be defined so as to totally reflect the light scattered from any position of an effective finge ⁇ rint contacting area E of the finge ⁇ rint contacting surface 21 toward the primarily projecting/re-incident surface 23, while the angle ⁇ must be defined so as to reflect the light primarily projected from the primarily projecting/re-incident surface 23 toward the central portion of the ultimately projecting surface 24.
  • the angle ⁇ between the primarily projecting/re-incident surface 23 and the finge ⁇ rint contacting surface 21 It is also preferable to consider the angle ⁇ between the primarily projecting/re-incident surface 23 and the finge ⁇ rint contacting surface 21.
  • the light passing between inside and outside of the prism 20 through the primarily projecting/re-incident surface 23 is refracted due to the refractive index of different media.
  • it is preferable to determine the angle ⁇ by considering the variation of the optical path of the light projected outside the prism 20 through the primarily projecting/re-incident surface 23, reflected from the reflecting mirror 25, and re- incident to the prism 20 through the primarily projecting/re-incident surface 23.
  • the above relation is a natural consequence of forming the totally reflecting surface 22 to have an angle ⁇ with the finge ⁇ rint contacting surface 21.
  • This relation expresses a shape of the prism according to the present invention.
  • the optical finge ⁇ rint acquisition apparatus has advantages effects of increasing productivity, reducing the manufacturing cost and frequency of mis-operation by reducing distortion of a finge ⁇ rint image and minimizing the optical system without relying on a separate lens or a prism for image correction.

Abstract

Disclosed is an optical fingerprint acquisition apparatus capable of reducing an image distortion and a size of an optical system by deforming the shape of a prism. The prism according to the invention includes a fingerprint contacting surface to be touched by a fingerprint of a person, a totally reflecting surface facing the fingerprint contacting surface with an angle $i(θ) for totally and inwardly reflecting the light scattered from the fingerprint in 'Contact with the fingerprint contacting surface, a primarily projecting/re-incident surface linking the fingerprint contacting surface to the totally reflecting surface with an angle. for primarily projecting the light totally reflected from the totally reflecting surface so as to be re-incident from outside, and an ultimately projecting surface facing the primarily projecting/re-incident surface for ultimately projecting the light re-incident to the primarily projecting/re-incident surface toward outside.

Description

OPTICAL FINGERPRINT ACQUISITION APPARATUS
Technical Field
The present invention relates to an optical fingeφrint acquisition apparatus, and in particular, to an optical fingeφrint acquisition apparatus capable of reducing an image distortion and a size of an optical system by deforming the shape of a prism.
Background Art
A fingeφrint acquisition apparatus is an apparatus for acquiring fingeφrints applicable to a fingeφrint recognizer, which is employed in personnel airlocks, safe locking devices, access control, diligence and laziness check, computer access control, etc., by comparing an acquired fingeφrint with a user's pre-registered fingeφrint. The fingeφrint acquisition apparatus is roughly classified into an optical type and a non-optical type.
An optical fingeφrint acquisition apparatus is an apparatus for irradiating light onto a fingeφrint laid on a prism for forming an image, and reading a fingeφrint image formed on an image sensor after being reflected in accordance with the shape of the valleys or ridges of the fingeφrint so as to be compared with a pre-stored fingeφrint. Fig. 1 shows a mechanism of an typical optical lingeφrint acquisition apparatus.
The fingeφrint acquisition apparatus in Fig. 1 represents a "scattering type" fingeφrint acquisition apparatus, which comprises an image forming prism 1, a light source 3, .a condensing lens 4, and an image sensor 5. The light is incident from the light source 3 to a fingeφrint acquisition window 2 of the image forming prism 1 at a peφendicular angle or an angle much less than a critical angle. Therefore, the light passes through the fingeφrint acquisition window 2 without reaching the image sensor at the ridges of the fingeφrint that do not reach the fingeφrint acquisition window 2, while the incident light is reflected and scattered from the valleys of the fingeφrint. The scattered light is incident to the condensing lens 4 and detected by the image sensor 5. Accordingly, the amount of light incident from the valleys of a fingeφrint to the image sensor 5 is discriminated from the amount of light incident from the ridges of a fingeφrint to the image sensor 5. As a consequence, the image sensor 5 outputs electric signals of different levels in accordance with the pattern of the fingeφrint. An image processor (not shown in the drawing) defines and processes an output value of the image sensor 5 by a digital signal so as to recognize patterns of the fingeφrint.
Meanwhile, there has been a strong demand for reducing the size of a fingeφrint acquisition apparatus in conformity with the recent trend of rriiriimizing sizes of products. In particular, the demand is focused on reducing the size of each component as well as of an optical path. However, since it is impossible to reduce the size of human fingers and fingeφrints, there is a limit to reduce the size of each component. Moreover, reducing the length of an optical path to exceed a necessary extent results in serious deterioration of the quality of a fingeφrint image. Japanese Laid-Open Patent Publication No. Hei 4-24881 (January 28, 1992) discloses a method of changing the optical path to diverse directions within an image forming prism. Japanese Laid-Open Patent Publication No. Hei 2-176984 (July 10, 1990) discloses a method for changing an optical path in diverse manners inside of an image forming prism and a method for correcting an image projected from the image forming prism by using a correction lens and a correction prism.
Thus, ongoing researches are being made to seek a' method for correcting an image distortion in addition to a method for forming and projecting a fingeφrint image. The distance (optical path) between an image sensor and a fingeφrint is variable depending on a position of the fingeφrint on the prism of an optical fingeφrint acquisition apparatus. Therefore, the fingeφrint image is distorted from its actual image at a position where an ultimate image is formed and phased open. The distortion often appears in a ladder shape.
To minimize such an image distortion, distortion and astigmatism of an image are corrected by combining a condensing lens for condensing a fingeφrint image projected from a prism with a correction lens or a correction prism. In that case, however, the optical system becomes larger. In other words, size of the fingeφrint acquisition apparatus cannot be reduced because the condensing lens, image correction prism, path changing mirror, etc. are discretely installed. This ultimately results in an increase of the manufacturing cost and a decrease of the productivity.
A desirable solution to reduce image distortion while maintaining size of the optical system to be small is to unify the distance (length of the optical path) from any position of the fingeφrint to the image sensor.
Disclosure of the Invention
It is, therefore, an object of the present invention to provide an optical fingeφrint acquisition apparatus employing a prism and a reflecting mirror that can unify the distance (length of the optical path) from any position of a fingeφrint to an image sensor to minimize the optical path difference without relying on a lens or a prism for image correction.
To achieve the above and other objects of the present invention, there is provided a fingeφrint acquisition apparatus for acquiring a fingeφrint image by means of light scattered from valleys and ridges of a fingeφrint, the apparatus comprising a prism and a reflecting mirror.
The prism comprises: a fingeφrint contacting surface to be touched by a fingeφrint of a person; a totally reflecting surface facing the fingeφrint contacting surface for totally and inwardly reflecting the light scattered from the fingeφrint in contact with the fingeφrint contacting surface; a primarily projecting/re-incident surface linking the fingeφrint contacting surface to the totally reflecting surface for primarily projecting the light totally reflected from the totally reflecting surface so as to be re-incident from outside; and an ultimately projecting surface facing the primarily projecting/re-incident surface for ultimately projecting the light re- incident to the primarily projecting re-incident surface toward outside. The reflecting mirror is installed outside adjacent to the primarily projecting/re-incident surface of the prism so as to correct the optical path difference by reflecting the light projected from the primarily projecting/re-incident surface so as to be re-incident to the primarily projecting/re-incident surface.
The prism is preferably shaped rectangular, and each surface thereof preferably has the following relation.
(Length of the Ultimately Projecting Surface) < (Length of the Primarily Projecting/Re-Incident Surface) < (Length of the Fingeφrint Contacting Surface) < (Length of the Totally Reflecting Surface)
Brief Description of the Drawings
The other objects, features and advantages of the present invention will now become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a diagram illustrating construction of a conventional fingeφrint acquisition apparatus; and
Fig. 2 is a diagram illustrating construction of an optical fingeφrint acquisition apparatus according to the present invention.
Best Mode for Carrying Out the Invention A preferred embodiment of the present invention will be described herein below with reference to the accompanying drawing. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
Fig. 2 shows a fingeφrint acquisition apparatus, including a prism 20 for forming a fingeφrint image by means of light scattered from valleys and ridges of a fingeφrint, a condensing lens 30 and a light source 40, according to an embodiment of the present invention.
The prism 20 employed in the embodiment of the present invention is a rectangular prism, comprising: a fingeφrint contacting surface 21 to be touched by a fingeφrint 15 of a person; a totally reflecting surface 22 facing the fingeφrint contacting surface 21 with an angle θ for totally and inwardly reflecting the light scattered from the fingeφrint in contact with the fingeφrint contacting surface 21; a primarily projecting/re-incident surface 23 linking the fingeφrint contacting surface 21 to the totally reflecting surface 22 with an angle φ for primarily projecting the light totally reflected from the totally reflecting surface 22 so as to be re-incident from outside; and an ultimately projecting surface 24 facing the primarily projecting/re-incident surface 23 for ultimately projecting the light re-incident to the primarily projecting/re-incident surface 23 toward outside. The light projected from the ultimately projecting surface 24 is focused on an image sensor (not shown in the drawing) by the condensing lens 30 so as to be acquired as an image.
Meanwhile, a reflecting mirror 25 is installed outside adjacent to the primarily projecting/re-incident surface 23 at an angle δ. The reflecting mirror 25 reflects the light projected from the primarily projecting/re-incident surface 23 so as to be re-incident to the prism 20 through the primarily projecting/re-incident surface 23.
As shown in Fig. 2, the light source 40 irradiates light, which passes through the totally reflecting surface 22 of the prism and reaches a frngeφrint 15 in contact with the fingeφrint contacting surface. A detailed description of the operation of the light source 40 will be omitted here because it is the same as the conventional optical fingeφrint acquisition apparatus. Refeπing to Fig. 2, the light scattered from the fingeφrint 15 is first totally and inwardly reflected from the totally reflecting surface 22. As shown in Fig. 2, the totally reflecting surface 22 is not parallel with the fingeφrint contacting surface 21 but is oblique to have an angle θ therewith. Therefore, the light hit the totally reflecting surface 22 is totally reflected and orients the primarily projecting/re-incident surface 23.
The light totally reflected toward the primarily projecting/re-incident surface 23 penetrates the primarily projecting/re-incident surface 23, and is projected outside the prism 20. The projected light is reflected from the reflecting mirror 25 installed oblique with respect to the primarily projecting/re-incident surface 23, and re-incident thereto. Here, the reflecting mirror 25 is installed with an angle δ so that the light can orient the central portion of the ultimately projecting surface 24. The light reflected from the reflecting mirror 25 and re-incident to the prism 20 is projected outside the ultimately projecting surface 24, and incident to an image sensor (not shown in the drawing) through the condensing lens 30. As described above, the optical paths of the light scattered from each position "a," "b,1'
"c" of the fingeφrint 15 and condensed onto the condensing lens are almost the same. Comparing the position "a" with the position "c," the optical path of the light scattered from the position "c" is longer than that of the light scattered from the position "a" until the light is totally- reflected inside of the prism 20. However, the optical path of the light scattered from the position "a" is longer than that of the light scattered from the position "c" after the light is totally reflected from the totally reflecting surface 22. Accordingly, all the optical paths have almost the same lengths from any position of the fingeφrint 15, and distortion of the fingeφrint image can be reduced as a consequence.
Therefore, according to the present invention, it is critical how to determine the angle θ with the totally reflecting surface 22 as well as the angle δ with the reflecting mirror 25. The angle θ must be defined so as to totally reflect the light scattered from any position of an effective fingeφrint contacting area E of the fingeφrint contacting surface 21 toward the primarily projecting/re-incident surface 23, while the angle δ must be defined so as to reflect the light primarily projected from the primarily projecting/re-incident surface 23 toward the central portion of the ultimately projecting surface 24.
It is also preferable to consider the angle φ between the primarily projecting/re-incident surface 23 and the fingeφrint contacting surface 21. The light passing between inside and outside of the prism 20 through the primarily projecting/re-incident surface 23 is refracted due to the refractive index of different media. Thus, it is preferable to determine the angle φ by considering the variation of the optical path of the light projected outside the prism 20 through the primarily projecting/re-incident surface 23, reflected from the reflecting mirror 25, and re- incident to the prism 20 through the primarily projecting/re-incident surface 23. Also, it is possible to fill in the space between the primarily projecting/re-incident surface 23 and the reflecting mirror 25 with a light transmissible material, although Fig. 2 does not show any material filled therebetween.
Meanwhile, the following relation is established among each surface of the prism 20 in Fig. 2.
(Length of the Ultimately Projecting Surface 24) < (Length of the Primarily Projecting/Re- Incident Surface 23) < (Length of the Fingeφrint Contacting Surface 21) < (Length of the Totally Reflecting Surface 22)
The above relation is a natural consequence of forming the totally reflecting surface 22 to have an angle θ with the fingeφrint contacting surface 21. This relation expresses a shape of the prism according to the present invention.
The optical fingeφrint acquisition apparatus according to the present invention has advantages effects of increasing productivity, reducing the manufacturing cost and frequency of mis-operation by reducing distortion of a fingeφrint image and minimizing the optical system without relying on a separate lens or a prism for image correction.
While the invention has been shown and described with reference to a certain preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

What Is Claimed Is:
1 , An optical fmgerprint acquisition apparatus for acquiring a fingerprint image by light scattered from a fingerprint, the apparatus comprising: a prism including a fingerprint contacting surface to be touched by a finge rint of a person, a totally reflecting surface facing the fingerprint concacting surface with an angle Θ for totally and inwardly reflecting the light scattered from (he fingerprint in contact with the fingerprint contacting surface, a primarily projecting re-incident surface hnldng the fmgjerprjnt contacting surface to the totally reflecting surface with an angle for primarily projecting the light totally reflected from (he totally reflecting surface so as to be re-incident from outside, and an ultimately projecting surface facing the primarily projectingre-incident surface for ultimately projecting the light re-incident to the primarily projecting re-incideftt surface coward outside; and a reflecting mirror installed outside adjacent to the primarily projec ngre-incident Surface of the prism, at an angle S for reflecting the light projected from the primarily projectingte-incident surface so as to be re-incident to the prism through the primarily projecting/re-incident surface,
2 The optical fingerprint acquisition apparatus of claim 1, wherein the following relation is established among each surface of the prism. (Length of (he Ultimately Projecting Surface) < (Length σf the Primarily Projecting/Re-Incident Surface) < (Length of the Fingerprint Contacting Surface) < (Length of the Totally Reflecting Surface)
3, The optical fingerprint acquisition apparatus of claim 1 or 2, wherein the angle 0 is defined so as to totally reflect the light scattered at a predetermined angle from an effective fingerprint contacting area of the fingerprint contacting surface toward the primarily projecting/re-incident surface, the angle δ is defined so as to reflect the all the light primarily projected from the ■ primarily projecting/re-incident surface toward a central portion of the ultimately projecting surface, and the angle φ is defined so as to refract all the light primarily projected from the primarily projecting/re-incident surface and reflected from the reflecting πύrror toward the central portion of the ultimately projecting surface.
4. The optical fingerprint acquisition apparatus of claim 1 or 2, wherein a light transmissible material is filled in the space between the primarily projecting/re-incident surface of the prism and the reflecting mirror.
PCT/KR2002/001719 2001-09-17 2002-09-13 Optical fingerprint acquisition apparatus WO2003025844A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003529397A JP3782420B2 (en) 2001-09-17 2002-09-13 Optical fingerprint acquisition device

Applications Claiming Priority (2)

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KR10-2001-0057070A KR100432490B1 (en) 2001-09-17 2001-09-17 Optical fingerprint acquisition apparatus
KR2001/57070 2001-09-17

Publications (1)

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KR (1) KR100432490B1 (en)
CN (1) CN1258736C (en)
WO (1) WO2003025844A1 (en)

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US20030053228A1 (en) 2003-03-20
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US6826000B2 (en) 2004-11-30
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