WO2007059694A1 - Dispositif de reconnaissance d'empreintes digitales a grande surface - Google Patents

Dispositif de reconnaissance d'empreintes digitales a grande surface Download PDF

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Publication number
WO2007059694A1
WO2007059694A1 PCT/CN2006/003051 CN2006003051W WO2007059694A1 WO 2007059694 A1 WO2007059694 A1 WO 2007059694A1 CN 2006003051 W CN2006003051 W CN 2006003051W WO 2007059694 A1 WO2007059694 A1 WO 2007059694A1
Authority
WO
WIPO (PCT)
Prior art keywords
prism
waist
lens
light
light source
Prior art date
Application number
PCT/CN2006/003051
Other languages
English (en)
Chinese (zh)
Inventor
Quanzhong Che
Original Assignee
Zksoftware Inc.
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
Priority claimed from CN 200520142157 external-priority patent/CN2867455Y/zh
Priority claimed from CN 200520142156 external-priority patent/CN2867454Y/zh
Application filed by Zksoftware Inc. filed Critical Zksoftware Inc.
Publication of WO2007059694A1 publication Critical patent/WO2007059694A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms

Definitions

  • the prism section of the fingerprint collector for collecting fingerprints is a right-angled isosceles triangle, with the bottom surface of the triangle as the fingerprint collection surface, the light source on one side is the incident surface, and the other side is equipped with the lens and the photoelectric surface.
  • the detector is the exit surface. Due to the height of the right triangle and the overall thickness of the collector, the image acquisition surface is usually small, the fingerprint image for comparison recognition is small, and the full fingerprint of the large finger cannot be collected. In many cases, the fingerprint recognition is required. Not available in precision equipment. For example, in the field of identification such as public security, customs, and ID cards, it is necessary to collect large-scale fingerprint images. Therefore, the existing fingerprint collector equipped with a right-angled triangular prism is large and cumbersome, is inconvenient to be used, and has a small image area for fingerprint collection, and the application field is subject to many restrictions. Summary of the invention
  • a large-format fingerprint collector including a light source, a prism, a lens, and a photodetector
  • the prism section is an isosceles triangle having a vertex angle greater than 90 degrees
  • a prism side The oblique waist is equipped with a light source, and the other side of the prism is equipped with a lens and a photodetector on the side of the inclined waist.
  • a light source is arranged on one side of the long waist side of the prism, and a single mirror is arranged on one side of the short waist side of the prism, and an angle between the right side of the lower end of the primary mirror and the primary mirror is greater than 90 degree secondary mirror, outer side of the light source on the long waist side of the prism
  • the lens is equipped with a photodetector on the outside of the lens.
  • the light source is composed of a light guide plate located on one side of the inclined waist surface of the prism and a light emitting diode located at the outer end of the light guide plate.
  • the angle between the long and short waist surfaces of the prism is 112.5 degrees
  • the angle between the long waist surface of the prism and the bottom surface is 22.5 degrees
  • the angle between the short waist surface of the prism and the bottom surface is 45 degrees.
  • the present invention has the following beneficial effects: By changing a right-angled isosceles triangular prism to an isosceles triangular prism with a vertex angle greater than 90 degrees, the thickness of the prism, that is, the height of the triangle can be greatly reduced; The area of the set surface is greatly increased, that is, the length of the bottom side of the triangle is increased, thereby reducing the volume and increasing the collection area. By reducing the angle of the side of the isosceles triangle, the length of the prism and the thickness of the relatively narrow prism can be greatly increased without increasing the thickness of the prism, thereby creating conditions for increasing the fingerprint image acquisition area;
  • the margin space on the prism tip side can be fully utilized, which is advantageous for reducing
  • the size of the whole machine does not affect the fingerprint collection surface and Fingerprint image effect; After increasing the fingerprint collection surface, it will obviously increase the recognition rate accordingly.
  • the utility model has the advantages of large fingerprint collecting surface, small volume, light weight, low distortion rate and small distortion.
  • the large-format fingerprint collector of the invention has the advantages of thin prism, small volume, light weight, large collecting surface, small distortion, low distortion rate, high recognition rate, convenient assembly and reliable performance, and is most suitable for public security. Advantages of the identification field in customs, ID cards, etc. DRAWINGS
  • FIG. 1 is a schematic structural view of a first embodiment of a large-format fingerprint collector of the present invention
  • FIG. 2 is a schematic structural view of a second embodiment of the large-format fingerprint collector of the present invention
  • FIG. 3 is a second aspect of the large-format fingerprint collector of the present invention
  • FIG. 4 is a schematic structural view of a third embodiment of the large-format fingerprint collector of the present invention. detailed description
  • the large-format fingerprint collector is composed of a light source, a prism 1, a lens 2, and a photodetector 3.
  • the angle between the long and short waist faces of the prism 1 is 112.5 degrees
  • the angle between the long waist surface of the prism 1 and the bottom surface is 22.5 degrees
  • the angle between the short waist surface of the prism 1 and the bottom surface is 45 degrees.
  • the prism is optically called a half-angle.
  • the prism designed to make the optical path ideal, the clearest and most complete image, can reduce the thickness of the prism, ensure the large area of the reflected fingerprint image, minimize the distortion rate and optimize the image quality.
  • the prism 1 is equipped with a light source on one side of the long waist, and the lens 2 and the photodetector 3 are provided on the short side of the prism 1.
  • the light source is composed of a light guide plate 4 located on one side of the inclined waist surface of the prism 1 and a light emitting diode 5 located at the outer end of the light guide plate 4.
  • the light guide plate 4 is preferably a plexiglass plate, and the light source generated by the light emitting diode is red light or green light.
  • the light guide plate 4 is located on one side of the prism, and the surface of the light guide plate is covered with a transparent uniform light film.
  • the thickness of the uniform light film is 0.10 mm, which is more favorable for illuminating the convexity of the fingerprint, improving the sharpness and contrast of the fingerprint image, and facilitating detection. Precision.
  • the prism 1 has a height of 8 to 14 mm, a bottom width of 18 to 26 mm, and a length of 24 to 36 mm. This design ensures a large image acquisition surface and can capture a full fingerprint image, thereby better reducing the volume and increasing the size. The advantage of fingerprint collection area.
  • the bottom surface of the prism 1 is coated with a transparent elastic resin film 6 made of silicone resin.
  • the transparent elastic resin film 6 can be made of silicone resin or acrylic resin, and its light transmittance and refractive index are similar to those of the glass, and will not be affected.
  • the imaging of the prism is designed such that the surface of the resin film of the prism becomes a fingerprint collecting surface. When the incident light is irradiated onto the ridge of the fingerprint, the convex stripe is pressed by the elastic resin film, and the resin film and the convex protrusion of the finger are raised.
  • the weave can be infiltrated, and the incident light can be well absorbed at the ridges.
  • the concave strip of the fingerprint is not in contact with the resin film, it is isolated by a layer of air, and the incident light will form a complete internal reflection here, and then enter the exit surface and then be directed to the outside of the prism, thereby improving the recognition rate of the fingerprint image. , reduce the distortion rate.
  • the light path is: the light source generated by the light-emitting diode 5 is incident on the light guide plate 4, the light of the light guide plate 4 is transmitted through the long waist surface of the prism 1 toward the transparent elastic resin film 6, and the reflected light obtained by the transparent elastic resin film 6 is transmitted through the prism 1.
  • the short waist surface is directed toward the lens 2, and the light transmitted through the lens 2 is projected onto the photodetector 3, thereby completing the acquisition of the fingerprint image.
  • the position of the light source is interchanged with the position of the lens 2 and the photodetector 3, that is, the short waist of the prism 1
  • the light source is provided on one side of the surface, and the lens 2 and the photodetector 3 are disposed on the long waist side of the prism 1; 2)
  • the light guide plate 4 of the light source is located on the side of the prism, and the illumination surface is designed as a convex light guide surface and covered
  • the transparent uniform light film 7 shown in FIG. 3 is designed to more fully illuminate the convexity of the fingerprint, improve the sharpness and contrast of the fingerprint image, and is advantageous for improving the detection precision.
  • the light guide plate 4 has a bump width of 0.1 to 0.2 mm and a height of 0.05 0.1 mm. This design can better illuminate the fingerprint and improve the detection accuracy.
  • the light path is: The light generated by the light-emitting diode 5 is incident on the light guide plate 4. The radiation light of the light guide plate 4 is transmitted through the short waist surface of the prism 1 toward the transparent elastic resin film 6, and the reflected light obtained by the transparent elastic resin film 6 is transmitted through the prism. The long waist surface of 1 is directed toward the lens 2, and the light transmitted through the lens 2 is projected onto the photodetector 3, thereby completing the acquisition of the fingerprint image.
  • the prism 1 is equipped with a light source on the long waist side, but the prism 1 has a short waist surface.
  • the side is equipped with a mirror 8, and the right side of the lower end of the mirror 8 is provided with a secondary mirror 9 with an angle of 100-130 degrees.
  • the prism 1 is fitted with a lens 2 at the lower end of the long waist, and the lens 2 is provided outside.
  • the photodetector 3 is mounted, the upper end of the primary mirror 8 is inclined to the short side, and the right end of the secondary mirror 9 is inclined downward.
  • the mirror surface of the primary mirror 8 is at an angle of 5 to 8 degrees from the exit surface of the prism 1. This design allows for very sharp, distorted images.
  • the angle between the lens 2 plane and the surface of the photodetector CM053 is 5 to 8 degrees, so that the fingerprint image can be corrected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Image Input (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

Dispositif de reconnaissance d'empreintes digitales à grande surface comprenant une source lumineuse (5), un prisme (1), une lentille (2) et un détecteur photoélectrique (3). La section en coupe du prisme (1) ne forme pas un triangle isocèle et l'angle au sommet fait plus de 90°. La source lumineuse (5) est disposée sur un des côtés du prisme(1) alors que la lentille (2) et le détecteur photoélectrique (3) sont disposés sur l'autre côté de ce même prisme. En variante, on trouve un premier miroir (8) disposé sur le côté court du prisme (1), un second miroir (9) sur le fond droit du premier miroir (9), l'angle entre ces miroirs étant supérieur à 90°, cependant que la source lumineuse (5), la lentille (2) et le détecteur photoélectrique (3) se trouvent sur le côté long du prisme (1).
PCT/CN2006/003051 2005-11-24 2006-11-14 Dispositif de reconnaissance d'empreintes digitales a grande surface WO2007059694A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200520142156.X 2005-11-24
CN 200520142157 CN2867455Y (zh) 2005-11-24 2005-11-24 大幅面指纹采集器
CN200520142157.4 2005-11-24
CN 200520142156 CN2867454Y (zh) 2005-11-24 2005-11-24 不等边棱镜指纹采集器

Publications (1)

Publication Number Publication Date
WO2007059694A1 true WO2007059694A1 (fr) 2007-05-31

Family

ID=38066914

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2006/003051 WO2007059694A1 (fr) 2005-11-24 2006-11-14 Dispositif de reconnaissance d'empreintes digitales a grande surface

Country Status (1)

Country Link
WO (1) WO2007059694A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5109427A (en) * 1989-11-13 1992-04-28 Goldstar Co., Ltd. Fingerprint recognition device using a hologram
JPH10293844A (ja) * 1997-04-17 1998-11-04 Sony Corp 指紋照合装置の参照枠設定方法
US6429927B1 (en) * 1999-12-23 2002-08-06 Activcard Ireland, Limited Imaging device, especially for optical fingerprinting
CN1369077A (zh) * 1999-08-04 2002-09-11 赛寇根公司 用于在光学图像捕获系统中减少梯形失真并提高图像清晰度的方法和装置
US6891962B1 (en) * 1998-09-14 2005-05-10 Mitsubishi Denki Kabushiki Kaisha Fingerprint sensor and fingerprint recognition system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5109427A (en) * 1989-11-13 1992-04-28 Goldstar Co., Ltd. Fingerprint recognition device using a hologram
JPH10293844A (ja) * 1997-04-17 1998-11-04 Sony Corp 指紋照合装置の参照枠設定方法
US6891962B1 (en) * 1998-09-14 2005-05-10 Mitsubishi Denki Kabushiki Kaisha Fingerprint sensor and fingerprint recognition system
CN1369077A (zh) * 1999-08-04 2002-09-11 赛寇根公司 用于在光学图像捕获系统中减少梯形失真并提高图像清晰度的方法和装置
US6429927B1 (en) * 1999-12-23 2002-08-06 Activcard Ireland, Limited Imaging device, especially for optical fingerprinting

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