WO2005078660A1 - Dispositif d’acquisition d’image d’empreinte digitale - Google Patents

Dispositif d’acquisition d’image d’empreinte digitale Download PDF

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Publication number
WO2005078660A1
WO2005078660A1 PCT/JP2005/002289 JP2005002289W WO2005078660A1 WO 2005078660 A1 WO2005078660 A1 WO 2005078660A1 JP 2005002289 W JP2005002289 W JP 2005002289W WO 2005078660 A1 WO2005078660 A1 WO 2005078660A1
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WO
WIPO (PCT)
Prior art keywords
light
fingerprint
input device
detection surface
image input
Prior art date
Application number
PCT/JP2005/002289
Other languages
English (en)
Japanese (ja)
Inventor
Masaaki Oda
Kazuyoshi Sugiyama
Seiji Hanada
Hidetaka Okamatsu
Original Assignee
Lite-On Japan 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 Lite-On Japan Ltd. filed Critical Lite-On Japan Ltd.
Publication of WO2005078660A1 publication Critical patent/WO2005078660A1/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 present invention relates to a fingerprint image input device used for fingerprint identification in personal authentication.
  • Such fingerprint image input devices mainly use a reduction optical system, but since the optical path length is required to be about 50 mm, it has been difficult to reduce the size and thickness.
  • the use of prism mirrors to reduce the thickness causes distortion and enlargement / reduction of fingerprint images, and fingerprint images from different fingerprint input devices cannot be recognized as the same fingerprint. Fingerprint authentication was difficult.
  • non-optical methods such as a capacitance method and an electric field method for directly detecting a fingerprint image on the surface of a semiconductor
  • the non-optical methods such as the capacitance method and the electric field method have a problem in that the sensor element is destroyed by static electricity because the human body directly contacts the semiconductor surface of the sensor unit.
  • a powerful optical fingerprint input device uses a reflected light system in which input light is reflected on a fingerprint surface and reflected light is received by a light receiving element, as shown in FIG.
  • a total reflection type in which light is confined in the light guide and irregularly reflected light generated when the fingerprint and the light guide adhere to each other is received by the light receiving element.
  • the reflected light method As shown in FIG. 5, light is applied from a light source Id to a light incident surface If in a light guide lc. Is irradiated, the light passes through the light guide lc and goes to the fingerprint detection surface le in the light guide lc. The light that has reached the fingerprint detection surface le in the light guide lc collides with the fingerprint surface and generates reflected light.
  • the reflected light generated on the fingerprint detection surface le in the light guide lc is condensed by the refractive index distribution type micro lens lb, and forms an image on the light receiving element la as an erect 1: 1 image.
  • the reflected light received by the light receiving element la is converted into an electric signal and output to an external device as an analog signal.
  • the contrast ratio is obtained by a contrast transfer function (MTF value), and is a value obtained by receiving an image of the unevenness of the fingerprint surface by the light receiving element and calculating the light intensity level by the following equation.
  • max and mm indicate the maximum and minimum values of the light amount.
  • the MTF value is a value indicating how much light of a certain portion of the subject can be collected at a corresponding position in the image by using the Modulation Transfer Function. This is to check the imaging performance of the lens by numerical values. The center force of the screen is also inspected for each aperture down to the periphery, and the higher the MTF value, the clearer the difference in the uneven surface with the better contrast ratio.
  • the problem to be solved is that, in an optical fingerprint image input device, in the reflected light method, reflected light generated on the inner and outer surfaces of the light guide deteriorates the contrast ratio of the fingerprint unevenness and lowers the quality of the fingerprint image.
  • reflected light generated on the inner and outer surfaces of the light guide deteriorates the contrast ratio of the fingerprint unevenness and lowers the quality of the fingerprint image.
  • a fingerprint image input device is a fingerprint image input device for fingerprint authentication, which has a fingerprint detection surface on which a fingerprint of a finger to be authenticated is placed, and detects incident light from a light source.
  • a fingerprint detection surface on which a fingerprint of a finger to be authenticated is placed
  • the light incident surface on which the light of the light source is incident is substantially orthogonal to the optical axis of the light source.
  • the angle of incidence of the incident light in the light guide with respect to the fingerprint detection surface is set to an angle at which reflected light and irregularly reflected light are generated.
  • ⁇ the critical angle of light
  • the light receiving angle of light from the fingerprint detection surface with respect to the fingerprint detection surface is ⁇ 90 °;
  • a background surface that enhances the contrast of the fingerprint image with a width equal to or larger than the light receiving area width is provided, and the color of the background color is black.
  • the light source since the light source is substantially orthogonal to the light incident surface of the light guide, the light source employs a total reflection light system, and the incident light in the light guide is used. Since the angle of incidence of light on the fingerprint detection surface is set to an angle at which reflected light and irregularly reflected light are generated, a reflected light method is employed. As a result, the contrast ratio of fingerprint unevenness that is strong against dry fingers can be increased. The advantages of the two-light system can be adopted. Further, the provision of the background surface makes the fingerprint image clearer.
  • FIG. 1 is a front sectional view showing a schematic configuration of a fingerprint image input device 3 according to the present invention.
  • FIG. 2 is a fingerprint image obtained with normal finger strength by the fingerprint image input device 3 of the present invention.
  • FIG. 3 is a fingerprint image obtained by drying a finger force using the fingerprint image input device 3 of the present invention.
  • FIG. 4 is a front sectional view showing a schematic configuration of a fingerprint image input device 6 in Embodiment 2 of the present invention.
  • FIG. 5 is a front sectional view showing a schematic configuration of a reflected light type fingerprint image input device 1 according to a conventional example.
  • FIG. 6 is a front sectional view showing a schematic configuration of a fingerprint image input device 2 of a total reflection light system according to the conventional example.
  • FIG. 7 is a fingerprint image obtained with normal finger strength by the total reflection light type fingerprint image input device according to the conventional example.
  • FIG. 8 Dry finger strength is also obtained by the total reflection light type fingerprint image input device according to the conventional example. This is a fingerprint image obtained.
  • the object of the present invention has been realized by combining the reflected light method and the total reflection light method.
  • FIG. 1 is a diagram showing a schematic configuration of a fingerprint image input device 3 according to the present invention.
  • a light source 3d is provided below a transparent light guide 3c, and a refractive index distribution is shown diagonally below.
  • the micro lens 3b and the light receiving element 3a are provided.
  • the light guide 3c is a light-transmitting substance such as a transparent resin glass such as a transparent acrylic resin, and is formed so as to be substantially orthogonal to the optical axis d of the light source 3d.
  • An incident surface 3f is provided. This is to prevent the influence of light reflected from the outer surface of the light guide 3c as in the total reflection light system.
  • a cured film of a crosslinkable resin is provided on the surface of the light guide 3c. This is to improve hardness, weatherability, heat resistance, and abrasion resistance.
  • the force is 0 °.
  • the incident angle ex is the inclination angle of the incident light a with respect to the orthogonal axis of the fingerprint detection surface 3e.
  • the refractive index of the light guide is nl
  • the refractive index of air is n2
  • the incident angle ⁇ of the light from the light source is set to 0 ° ⁇ ⁇ ⁇ ⁇ . This is set to an angle at which reflected light occurs even with a dry finger as in the reflected light method, due to the light that has reached the fingerprint 5a of the finger 5.
  • the critical angle of light in the light guide body is set to 0, and ⁇ 90 °, and a light exit surface 3 h is provided to be orthogonal to the reflected light b.
  • the background surface 3g has a length equal to or greater than the receivable area width of the refractive index distribution type microlens 3b described below, and is provided on a side symmetrical with the light exit surface 3h about the orthogonal axis of the fingerprint detection surface 3e. Being done.
  • the color of the background surface 3g is a single black color.
  • a refractive index distribution type micro lens 3b and a light receiving element 3a are provided ahead of the reflected light b. ing.
  • the light source 3d is, for example, a monochromatic light source such as a laser beam or an LED light, or a light source such as a fluorescent lamp, an incandescent lamp, a HID lamp, an ultraviolet ray, or an infrared ray.
  • a monochromatic light source such as a laser beam or an LED light
  • a light source such as a fluorescent lamp, an incandescent lamp, a HID lamp, an ultraviolet ray, or an infrared ray.
  • the finger 5 is swept in the direction of the arrow on the fingerprint detection surface 3e, so that the fingerprint 5a of the finger 5 or the fingerprint detection surface 3e in the light guide 3c.
  • the generated reflected light and irregularly reflected light are condensed by the refractive index distribution type microlens 3b, and form an image on the light receiving element 3a as an erect equal-magnification image.
  • the reflected light and the irregularly reflected light received by the light receiving element 3a are converted into electric signals and output to an external device as analog signals.
  • a good fingerprint image having a contrast ratio of 70% or more can be obtained with both the normal finger 5 and the dry finger 5.
  • the contrast ratio (MTF value) of both the fingerprint images in FIGS. 2 and 3 was 70%.
  • the form of the light guide 3c is changed, and the light source 3d and the light receiving element 3a are on the same side with respect to the orthogonal axis c of the fingerprint detection surface 3e.
  • the incident light a is incident on a light incident surface 3f substantially orthogonal to the optical axis d and then refracted by the incident light refracting surface 3i, and the incident angle a with respect to the orthogonal axis c is substantially 0 °, and the fingerprint is obtained. It reaches the detection surface 3e.
  • the background surface 3g has a width (length) equal to or larger than the light-receiving area width of the refractive index distribution type micro lens 3b, and the micro lens 3b and the light receiving element 3a around the orthogonal axis c of the fingerprint detection surface 3e. It is provided on the side symmetrical with the light exit surface 3h.
  • the color of the background surface 3g a single black color, a light amount level difference is generated in the uneven portion of the fingerprint image to be obtained. As a result, the contrast ratio of the fingerprint image is improved, and a clearer image can be obtained.
  • the light exit surface 3h is also provided so as to be orthogonal to the reflected light b.
  • the light source employs the total reflection light system and the incident angle employs the reflection light system, the contrast ratio of the fingerprint unevenness that is strong against a dry finger is increased. Therefore, it is useful as an optical fingerprint image input device. Further, the present invention can also be applied to the field of optically processing surface irregularities.

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  • 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 d’acquisition d’image d’empreinte digitale vérifiant une empreinte digitale (3) dans lequel, en association avec un guide de lumière (3c) d’un matériau transparent ayant une surface de détection d’empreinte digitale pour placer dessus l’empreinte digitale d’un doigt à vérifier et ayant un élément de réception de lumière (3a) qui reçoit au travers d’une micro-lentille (3b) une lumière incidente (a) provenant d’une source de lumière (3d) et réfléchie par la surface de détection d’empreinte digitale (3e) ci-dessus, une surface incidente à la lumière (3f), dans laquelle de la lumière, provenant de la source de lumière (3d), entre, est maintenue quasiment perpendiculaire à l’axe optique (d) de la source de lumière (3d) et l’angle d’incidence de la lumière incidente (a) par rapport à la surface de détection d’empreinte digitale (3e) dans le guide de lumière est réglé en tant qu’angle causant une lumière de réflexion et une lumière irrégulière, ce par quoi il est possible d’éliminer des problèmes avec une méthode de réflexion de lumière et une méthode de réflexion totale de lumière dans une méthode optique.
PCT/JP2005/002289 2004-02-16 2005-02-16 Dispositif d’acquisition d’image d’empreinte digitale WO2005078660A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004037893A JP2005228191A (ja) 2004-02-16 2004-02-16 指紋画像入力装置
JP2004-037893 2004-02-16

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WO (1) WO2005078660A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103348378A (zh) * 2011-01-27 2013-10-09 日本电气工程株式会社 图像读取设备
CN105184282A (zh) * 2015-10-14 2015-12-23 京东方科技集团股份有限公司 光学指纹检测装置及显示设备
CN109753852A (zh) * 2017-11-03 2019-05-14 华为技术有限公司 用于物体纹路的光学组件、显示组件及电子设备
CN111183429A (zh) * 2019-07-10 2020-05-19 深圳市汇顶科技股份有限公司 指纹识别的方法、装置和电子设备
WO2022016445A1 (fr) * 2020-07-23 2022-01-27 3M Innovative Properties Company Dispositif électronique pourvu d'un module de capteur optique

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108140125B (zh) * 2015-09-15 2021-11-02 上海箩箕技术有限公司 光学指纹成像系统和面阵传感器
KR102136553B1 (ko) 2016-11-30 2020-07-22 주식회사 엘지화학 디지털 디바이스의 제어 방법
KR20190088822A (ko) * 2018-01-19 2019-07-29 삼성전자주식회사 지문 인식을 위한 센서 및 전자 장치
CN110554454B (zh) * 2019-09-29 2020-07-31 厦门天马微电子有限公司 一种背光模组和显示装置

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JPH0581414A (ja) * 1991-09-20 1993-04-02 Toshiba Corp 指画像入力装置
JPH0589229A (ja) * 1991-09-26 1993-04-09 Toshiba Corp 指画像入力装置
JPH0944674A (ja) * 1995-07-31 1997-02-14 Sony Corp 画像読み取り装置
JPH11144032A (ja) * 1997-11-06 1999-05-28 Techno Imagica Kk 指紋読取装置
JPH11250231A (ja) * 1998-03-05 1999-09-17 Fujitsu Ltd 凹凸面接触パッドおよび凹凸パターン採取装置
JP2001283205A (ja) * 2000-04-03 2001-10-12 Seiko Instruments Inc 画像読取り装置およびその方法とその応用装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0581414A (ja) * 1991-09-20 1993-04-02 Toshiba Corp 指画像入力装置
JPH0589229A (ja) * 1991-09-26 1993-04-09 Toshiba Corp 指画像入力装置
JPH0944674A (ja) * 1995-07-31 1997-02-14 Sony Corp 画像読み取り装置
JPH11144032A (ja) * 1997-11-06 1999-05-28 Techno Imagica Kk 指紋読取装置
JPH11250231A (ja) * 1998-03-05 1999-09-17 Fujitsu Ltd 凹凸面接触パッドおよび凹凸パターン採取装置
JP2001283205A (ja) * 2000-04-03 2001-10-12 Seiko Instruments Inc 画像読取り装置およびその方法とその応用装置

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103348378A (zh) * 2011-01-27 2013-10-09 日本电气工程株式会社 图像读取设备
CN105184282A (zh) * 2015-10-14 2015-12-23 京东方科技集团股份有限公司 光学指纹检测装置及显示设备
WO2017063384A1 (fr) * 2015-10-14 2017-04-20 京东方科技集团股份有限公司 Dispositif de détection d'empreintes digitales optique et appareil d'affichage
US9996724B2 (en) 2015-10-14 2018-06-12 Boe Technology Group Co., Ltd. Optical fingerprint detection apparatus and display device
CN105184282B (zh) * 2015-10-14 2019-04-23 京东方科技集团股份有限公司 光学指纹检测装置及显示设备
CN109753852A (zh) * 2017-11-03 2019-05-14 华为技术有限公司 用于物体纹路的光学组件、显示组件及电子设备
CN111183429A (zh) * 2019-07-10 2020-05-19 深圳市汇顶科技股份有限公司 指纹识别的方法、装置和电子设备
WO2021003723A1 (fr) * 2019-07-10 2021-01-14 深圳市汇顶科技股份有限公司 Procédé et appareil de reconnaissance d'empreintes digitales, et dispositif électronique
WO2022016445A1 (fr) * 2020-07-23 2022-01-27 3M Innovative Properties Company Dispositif électronique pourvu d'un module de capteur optique
US11954939B2 (en) 2020-07-23 2024-04-09 3M Innovative Properties Company Electronic device with optical sensor module

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