WO2016119492A1 - 蜂窝结构的指纹掌纹图像采集器及终端设备 - Google Patents

蜂窝结构的指纹掌纹图像采集器及终端设备 Download PDF

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Publication number
WO2016119492A1
WO2016119492A1 PCT/CN2015/093029 CN2015093029W WO2016119492A1 WO 2016119492 A1 WO2016119492 A1 WO 2016119492A1 CN 2015093029 W CN2015093029 W CN 2015093029W WO 2016119492 A1 WO2016119492 A1 WO 2016119492A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
light
fingerprint
honeycomb
Prior art date
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PCT/CN2015/093029
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English (en)
French (fr)
Inventor
张明方
Original Assignee
深圳印象认知技术有限公司
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 深圳印象认知技术有限公司 filed Critical 深圳印象认知技术有限公司
Priority to RU2017130373A priority Critical patent/RU2668524C1/ru
Priority to KR1020177023597A priority patent/KR102069219B1/ko
Priority to JP2017540128A priority patent/JP2018512635A/ja
Priority to US15/539,938 priority patent/US10482304B2/en
Priority to EP15879690.4A priority patent/EP3252655A4/en
Publication of WO2016119492A1 publication Critical patent/WO2016119492A1/zh

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    • 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
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0087—Simple or compound lenses with index gradient
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
    • 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

Definitions

  • the present invention relates to the field of image acquisition technologies, and in particular, to a fingerprint palmprint image collector of a honeycomb structure and a terminal device having the image collector.
  • fingerprint palmprint image collectors are used in more and more fields, such as mobile phones, tablet computers, televisions and other electronic terminals, as well as various security systems.
  • electronic terminals become more and more ultra-thin, natural requirements are placed on the size and thickness of image collectors integrated on electronic terminals and the clarity of captured images.
  • An existing fingerprint palmprint image collector such as the thin optical fingerprint collector disclosed in 201120403301.0, generally includes an image acquisition prism, an imaging device, and an image processing component, wherein the imaging device further includes a lens component, and a photoelectric signal conversion circuit and Components such as digital processors.
  • the image acquisition prism is used as the collection component of the fingerprint light, it is necessary to have a long enough light path to meet the imaging requirements of the light.
  • the lens component is required to complete the imaging of the fingerprint light, thereby requiring a longer optical path to be satisfied.
  • the object of the present invention is to provide a fingerprint palmprint image collector and a terminal device with a honeycomb structure, which has a compact structure and a thin thickness, can improve the contrast of a fingerprint image and adaptability to dry and wet fingers, and has a low cost.
  • the present invention provides a fingerprint palmprint image collector of a honeycomb structure, which comprises a light guide plate and a light source for injecting at least part of light into the light guide plate, and one side of the light guide plate is provided with a honeycomb panel.
  • the honeycomb panel is densely covered with a plurality of mutually parallel through holes having a diameter of 0.5 ⁇ m to 50 ⁇ m, and the collected fingerprint or palm print size is equal to the size of the collected image, and the honeycomb panel is The thickness is more than 5 times the diameter of the through hole, and the center distance between the adjacent through holes is less than or equal to 50.8 ⁇ m, and the other side of the honeycomb plate is provided with a photosensitive member.
  • an angle between the axial line of the through hole and the horizontal plane of the honeycomb panel is greater than or equal to 30° and less than or equal to 90°.
  • the light source is disposed on a side surface and/or an upper surface and/or a lower surface of the light guide plate.
  • the plurality of through holes are arranged in an array or in a staggered arrangement.
  • a side of the honeycomb panel facing the light guide plate is provided with a diffuse reflection layer.
  • the diffuse reflection layer is composed of a convex structure disposed between each adjacent through hole.
  • the light guide plate and the honeycomb panel are spaced apart or connected together, and the honeycomb panel and the sense
  • the light components are spaced apart or connected together.
  • the light source is fixed on the light guide plate by a bracket, the bracket is provided with a light guiding groove, the light source is disposed in the light guiding groove, and the light guiding groove is disposed to enable the light emitted by the light source to pass through the light emitting device
  • the angle between the rear and the normal in the light guide plate is arcsin(n 0 /n 2 ) to arcsin(n 1 /n 2 ); wherein n 0 is the refractive index of the air; n 1 is the surface liquid of the object contacting the light guide plate The refractive index; n 2 is the refractive index of the light guide plate.
  • honeycomb panel is replaced by a fiber optic panel consisting of a plurality of closely spaced fibers that are parallel to each other, one end of the fiber facing the light guide plate and the other end facing the photosensitive member.
  • a terminal device includes a fingerprint palmprint image collector of the honeycomb structure.
  • the present invention has the following beneficial effects:
  • a fingerprint palmprint image collector composed of a light guide plate, a honeycomb panel, a light source and a photosensitive member, which has a compact structure and a reduced thickness, and when the finger or the palm is printed on the light guide plate, the light is destroyed on the light guide plate.
  • the total reflection propagates inside, and a part of the light will escape from the light guide plate to the surface of the finger or the surface of the palm to form scattered light.
  • the scattered light has multiple angles, and the through-holes are arranged through the parallel holes arranged on the honeycomb panel to ensure that only the through-holes are ensured.
  • a single direction of light parallel to the through hole which can better shield stray light in multiple directions, and the through hole is sized to allow only a single light or beam to enter the through hole and to image only in a small range.
  • the size of the collected fingerprint or palm print is equal to the size of the collected image, and the light parallel or nearly parallel to the through hole will be irradiated to the photosensitive component through the through hole to generate a digital image signal, and the fingerprint is Or palmprint acquisition, because of its gully-like structure, the use of parallel light sensitization helps to obtain high-contrast images; that is, fingerprints or palm prints
  • a single parallel light back direction the greater the intensity of the light intensity reflected fingerprint or palmprint ridge line will reflect the palm print or fingerprint than the gully, so that palm print images or fingerprint ridge line pattern will be more clearly;
  • the present invention provides a diffuse reflection layer on one side of the honeycomb panel close to the light guide plate, so that the design can further destroy the total reflection propagation of light in the light guide plate, effectively solving the problem of dry fingers, and improving the adaptability to dry and wet fingers;
  • the fingerprint palmprint image collector of the honeycomb structure of the present invention is integrated on the terminal device, so that the terminal device adds fingerprint and palm print collection functions, and the terminal device has fewer additional components and low cost.
  • Embodiment 1 is a schematic structural view of Embodiment 1 of a fingerprint palmprint image collector of a honeycomb structure of the present invention
  • Embodiment 2 is a schematic structural view of Embodiment 2 of an image collector of the present invention.
  • Embodiment 3 is a schematic structural view of Embodiment 3 of an image collector of the present invention.
  • Embodiment 4 is a schematic structural view of Embodiment 4 of an image collector of the present invention.
  • Figure 5 is a schematic structural view of Embodiment 5 of the image collector of the present invention.
  • Embodiment 6 is a schematic structural view of Embodiment 6 of the image collector of the present invention.
  • Embodiment 7 is a schematic structural diagram of Embodiment 1 of a terminal device according to the present invention.
  • FIG. 8 is a schematic structural diagram of Embodiment 2 of a terminal device according to the present invention.
  • FIG. 1 is a schematic structural diagram of Embodiment 1 of a fingerprint palmprint image collector of a honeycomb structure of the present invention, which includes:
  • Light guide plate 1 The light guide plate 1 is widely selected, for example, a glass plate and various transparent materials.
  • the light source 2 is used for injecting at least part of the light into the light guide plate 1.
  • the light source 2 can be selected from an LED lamp or other light-emitting elements, which are not limited herein.
  • the light source 2 is disposed on the side and/or the light guide plate.
  • the light source 2 is disposed on the left side of the light guide plate 1 in the embodiment, and is directly fixed to the light guide plate 1 by bonding or other fixing means.
  • Honeycomb panel 3 In this embodiment, the honeycomb panel 3 is spaced apart from the lower surface of the light guide plate 2.
  • the honeycomb panel 3 is densely covered with a plurality of mutually parallel through holes 4, and the through hole 4 is generally selected as a circular hole. Axis of hole 4
  • the angle between the line and the horizontal plane of the honeycomb panel is greater than or equal to 30° and less than or equal to 90°, and the angle of the embodiment is 90°.
  • the through hole 4 has a diameter of 0.5 ⁇ m to 50 ⁇ m, and preferably the through hole 4 has a diameter greater than 1 ⁇ m and less than or equal to 5.8 ⁇ m.
  • the diameters of the respective through holes 4 are selected to be equal, and a plurality of through holes having unequal diameters may be selected.
  • the through holes may be arranged in an array or in a staggered arrangement. All are within the scope of the invention.
  • the size of the through hole is set to allow only a single light or a light beam to enter the through hole, and is imaged only in a small range, such as 1 pixel point, of course, may be greater than one pixel point; and the collected fingerprint Or the size of the palm print portion is equal to the size of the collected fingerprint or palm print image, and all of the above are the scope of protection of the present invention.
  • the thickness of the honeycomb panel 3 is more than 5 times the diameter of the through hole 4, and the center spacing of the holes between the adjacent through holes 4 is less than or equal to 50.8 micrometers. In this embodiment, 50.8 micrometers is selected, and the dense through hole 4 is designed.
  • the image collector can meet the resolution requirements of 500 PPI. When the center-to-center spacing between adjacent vias 4 is 25.4 micrometers, the image collector can meet the resolution requirement of 1000 PPI. When the center-to-center spacing between adjacent vias 4 is selected to be 12.7 micrometers, the image is selected. The collector can meet the resolution requirements of 2000 PPI.
  • the photosensitive member 5 includes a CMOS or CCD image sensor, and the photosensitive member 5 of this embodiment is fixed to the lower surface of the honeycomb panel 3 by bonding or screwing.
  • the light guide plate 1 provides a finger or palm print.
  • the light emitted by the light source 2 is incident into the light guide plate 1. At least part of the light is transmitted in the light guide plate 1 in total reflection.
  • the palm of the hand is printed on the upper surface of the light guide plate 1, since the refractive index of the finger surface or the palm surface is different from that of the air, the surface of the finger or the palm has sweat, and its refractive index is similar to that of water, which will destroy the total reflection propagation of the light in the light guide plate 1.
  • a part of the light will illuminate the light guide plate 1 to illuminate the surface of the finger or the surface of the palm to form scattered light, and the scattered light has a plurality of angles, and the through holes 4 which are parallel and densely arranged on the honeycomb plate 3 ensure that only through and through The light of the single direction parallel to the hole 4 can better shield the stray light in multiple directions, and at the same time make the size of the through hole 4 only allow a single light or a light beam to enter the through hole, so that the collected detected fingerprint or palm print
  • the portion is imaged only at one pixel, and the size of the collected fingerprint or palmprint portion (ie, the size of the object) is equal to the size of the collected fingerprint or palmprint image (ie, the size of the image).
  • Equivalent to the fingerprint or the palm print is formed by a plurality of dense object points (the object point size is equal to one pixel point size), and the object points are transmitted through the parallel light of the respective through holes 4 to transmit the optical signal to the photosensitive member 5 Image sensor, for fingerprint or palmprint acquisition, because of its gully structure, the use of parallel light sensitization helps to obtain high-contrast images; that is, fingerprints or palmprints are reflected back in the unidirectional parallel light, fingerprints Or the light intensity reflected by the palm ridges is greater than that of the fingerprint or palm sulcus, and the contrast of the resulting fingerprint or palm print image is increased, so that the image of the fingerprint or palm line is clearer.
  • the invention utilizes the principle of parallel light imaging: ensuring that a sufficiently small object is collected, and an image of the same size as the object can be formed by irradiation with parallel light.
  • FIG. 2 is a schematic structural diagram of Embodiment 2 of the fingerprint palmprint image collector of the honeycomb structure of the present invention, and most of the structures are the same as those of the embodiment described in FIG. 1 except that the light source 2 is set to two.
  • the two sides of the bracket 6 are respectively disposed on the left and right ends of the lower surface of the light guide plate 1.
  • the light guide slots 7 are respectively disposed on the upper surfaces of the brackets 6.
  • the two light sources 2 are respectively placed in the two light guide slots 7, and the light guide slots are respectively disposed.
  • n 0 is the refractive index of the air
  • n 1 is the refractive index of the liquid on the surface of the object contacting the light guide plate 1
  • n 2 is the refractive index of the light guide plate
  • the advantage of this design is that when there is no finger or palm contacting the light guide plate 1, the light incident from the light source 2 into the light guide plate 1 can form a lateral total reflection propagation in the light guide plate 1 (see the total reflection of FIG. 2). The light path is indicated), and when the finger or the palm touches the light guide plate 1, the total reflection propagation of the light in the light guide plate 1 is broken, and scattered light is formed, and the scattered light passes through the dense through hole 4 to be imaged on the photosensitive member 5.
  • FIG. 3 is a schematic structural diagram of Embodiment 3 of the fingerprint palmprint image collector of the honeycomb structure of the present invention, and most of the structures are the same as those of the embodiment described above with reference to FIG. 1, except that the photosensitive components 5 are spaced apart from each other in the honeycomb.
  • the axis of the through hole 4 of the honeycomb panel 3 is inclined downward to the right, and the angle between the axis of the through hole and the horizontal plane is greater than or equal to 30°. In this embodiment, 45° is selected, and each through hole 4 is mutually parallel.
  • the finger or the palm of the hand is printed on the light guide plate 1, the total reflection of the light in the light guide plate 1 is destroyed, and a part of the light will escape from the light guide plate 1 to the surface of the finger or the surface of the palm to form various angles of scattering.
  • the light is only parallel or nearly parallel to the through hole 4, that is, the light is also inclined downward to the left, and the light having an inclination angle of 45° or close to 45° can be irradiated to the photosensitive member 5 through the through hole 4, thereby effectively reducing the outside. Interference from stray light.
  • the finger print or the palm print of the gully structure which uses this parallel light sensitization, helps to obtain a high contrast image.
  • FIG. 4 is a schematic structural view of a fourth embodiment of the fingerprint palmprint image collector of the honeycomb structure of the present invention, and the majority of the structure is the same as that of the embodiment described above with reference to FIG. 1, except that the light guide plate 1 is disposed on the honeycomb panel.
  • the diffuse reflection layer 8 is disposed to further destroy the total reflection propagation of light in the light guide plate 1 to form an upward diffuse reflection light. In this way, the light propagates on the one hand with total reflection along the light guide plate 1 and on the other hand forms a scatter illumination.
  • This method is similar to the implementation of a surface light source.
  • the diffuse light illuminates the surface of the finger or palm and a portion of the parallel light is reflected from the surface of the finger or the surface of the palm through the dense through hole 4.
  • diffuse illumination and parallel light imaging can be used to effectively solve the problem of dry fingers and obtain clear fingerprint images.
  • FIG. 5 is a schematic structural diagram of Embodiment 5 of the fingerprint palmprint image collector of the honeycomb structure of the present invention, and most of the structures are the same as those of the embodiment described above with reference to FIG. 4, except that the through holes on the honeycomb panel 3 are The four-axis line is inclined downward to the left, and the angle between the axis and the horizontal plane is greater than or equal to 30° and less than or equal to 90°. In this embodiment, 45° is selected, and the through holes 4 are parallel to each other.
  • the diffuse reflection layer 8 on the upper surface of the honeycomb panel 3 is composed of a convex structure 9 disposed between each adjacent through hole 4, and the arrangement of the convex structures 9 further destroys the light in the light guide plate 1.
  • the total reflection propagates to form an upward diffuse light.
  • the light is transmitted on the one hand along the entire surface of the light guide plate 1.
  • the diffuse light illuminates the surface of the finger, and a part of the parallel light is reflected from the surface of the finger through the dense parallel through hole 4 to form an image.
  • the honeycomb panel is disposed below the light guide panel.
  • the plurality of through holes on the honeycomb panel penetrate the upper surface and the lower surface of the honeycomb panel, and the axial lines of the plurality of through holes are parallel to each other, the diameter of the through holes is 0.5 micrometers to 50 micrometers, and the thickness of the honeycomb panels is the diameter of the through holes. More than 5 times.
  • the axial line of the through hole 4 is perpendicular to the horizontal plane of the honeycomb panel (ie, the upper surface or the lower surface of the honeycomb panel), or the axial line of the through hole 4 is inclined obliquely to the left or right with respect to the horizontal plane of the honeycomb panel, and the inclination angle thereof is greater than or Equal to 30° and less than or equal to 90°.
  • the center-to-center spacing between adjacent vias on the honeycomb panel is less than or equal to 50.8 microns.
  • the image collector of the dense through hole 4 thus designed can meet the resolution requirement of 500 PPI.
  • the image collector can meet the resolution requirement of 1000 PPI, and the image acquisition is performed when the center-to-center spacing between adjacent vias 4 is selected to be 12.7 micrometers.
  • the device can meet the resolution requirements of 2000PPI. Therefore, those skilled in the art can know the proportional relationship between the center pitch of the holes between the through holes and the resolution of the image collector, and the center distance of the holes between the through holes can be adjusted according to a predetermined resolution.
  • FIG. 6 is a schematic structural diagram of Embodiment 6 of the fingerprint palmprint image collector of the honeycomb structure of the present invention, and most of the structures thereof may be the same as those of any of the foregoing embodiments of FIG. 1 to FIG. 5, except that:
  • the honeycomb panel 3 is replaced by a fiber optic panel 10 which is formed by a plurality of closely spaced mutually parallel optical fibers having one end facing the light guide plate 1 and the other end facing the photosensitive member 5.
  • Each of the optical fibers independently transmits the respective image elements from one end to the other end to the photosensitive member 5, and the respective optical fibers do not interfere with each other.
  • These dense image elements are combined to form a fingerprint or palm print image on the photosensitive member.
  • the other structures of the embodiment are the same as those of the embodiment shown in FIG. 4, and the principle of collecting images is the same as that of the honeycomb panel in the above embodiment, and the technology for collecting images by using the fiber plate has been utilized, and details are not described herein. .
  • FIG. 7 is a schematic structural diagram of a first embodiment of the terminal device of the present invention.
  • the terminal device 11 is provided with an image collector 12 according to any of the above-mentioned FIG. 1 to FIG. 6, and the image collector 12 is disposed at the edge of the terminal device 11.
  • the terminal device 11 such as a mobile phone, can be set on its HOME button.
  • the terminal device 11 adds a fingerprint and palm print collection function, and the terminal device 11 additionally has fewer components and is low in cost.
  • FIG. 8 is a schematic structural diagram of Embodiment 2 of the terminal device of the present invention, which includes the image collector 12 of any of the above-mentioned FIG. 1 to FIG. 6, the image collector 12 is an independent device, and the terminal device 11 passes the wire and Interfaces are connected to each other.

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  • Optics & Photonics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
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  • Computer Vision & Pattern Recognition (AREA)
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Abstract

一种蜂窝结构的指纹掌纹图像采集器及终端设备，图像采集器包括导光板及用于将至少部分光线射入导光板内的光源，所述导光板的一面设置有蜂窝板，所述蜂窝板上密布有多个相互平行的通孔，所述通孔的直径为0.5微米-50微米，且被采集的指纹或掌纹大小与采集到的图像大小相等，所述蜂窝板的厚度是通孔直径的5倍以上，相邻通孔之间的孔中心间距小于或等于50.8微米，所述蜂窝板的另一面设置有感光组件，该图像采集器可集成于终端设备中。本发明蜂窝结构的指纹掌纹图像采集器的结构紧凑、厚度较薄、可提高指纹图像的对比度及对干湿手指的适应能力，集成于终端设备中，使终端设备具备指纹、掌纹图像采集功能且该终端设备额外增加的部件少且成本低。

Description

蜂窝结构的指纹掌纹图像采集器及终端设备
本申请要求于2015年1月29日提交中国专利局、申请号为201510046991.1、发明名称为“蜂窝结构的指纹掌纹图像采集器及终端设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及图像采集技术领域，具体涉及一种蜂窝结构的指纹掌纹图像采集器及具有该图像采集器的终端设备。
背景技术
目前指纹掌纹图像采集器在越来越多的领域得到应用，例如手机、平板电脑、电视机等各种电子终端，以及各种安防系统等。随着电子终端越来越趋于超薄化，自然对集成在电子终端上的图像采集器的体积、厚度及采集图像的清晰度等方面提出了较高要求。
现有的指纹掌纹图像采集器，例如201120403301.0公开的薄型光学指纹采集器，通常包括图像采集棱镜、成像装置及图像处理组件，其中，所述成像装置还包括透镜组件，以及光电信号转换电路和数字处理器等部件。由于采用图像采集棱镜作为指纹光线的采集部件，必须要有足够长的光路才能满足光线的成像需求，特别是，还需要通过所述透镜组件完成指纹光线的成像，由此更需要较长光路满足光线的成像需求。由于图像采集棱镜和透镜组件本身具有较大的体积和厚度，再加上光路长度等因素，使得图像采集器必须具有较大的体积和厚度才能实现指纹图像的采集。还由于图像采集棱镜和透镜组件等相关部件带来的高成本和结构的复杂度，使得现有的图像采集器难以满足各种电子终端对图像采集器小体积、低薄度、高清晰的要求。
因此，如何减小图像采集器的厚度并提高采集图像的清晰度，成为本技术领域人员亟待解决的技术难题。
发明内容
本发明的目的在于提供一种蜂窝结构的指纹掌纹图像采集器及终端设备，其结构紧凑、厚度较薄、可提高指纹图像的对比度及对干湿手指的适应能力，其成本较低。
为了达到上述目的，本发明提供一种蜂窝结构的指纹掌纹图像采集器，其中包括导光板及用于将至少部分光线射入导光板内的光源，所述导光板的一面设置有蜂窝板，所述蜂窝板上密布有多个相互平行的通孔，所述通孔的直径为0.5微米-50微米，且被采集的指纹或掌纹大小与采集到的图像大小相等，所述蜂窝板的厚度是通孔直径的5倍以上，相邻通孔之间的孔中心间距小于或等于50.8微米，所述蜂窝板的另一面设置有感光组件。
进一步地，所述通孔的轴心线与蜂窝板的水平面夹角为大于或等于30°且小于或等于90°。
进一步地，所述光源设置于导光板的侧面和/或上表面和/或下表面。
进一步地，多个所述通孔为阵列排列或错落排列。
进一步地，所述蜂窝板正对着导光板的一面设置有漫反射层。
进一步地，所述漫反射层由设置于各相邻所述通孔之间的凸起结构组成。
进一步地，所述导光板与蜂窝板之间为间隔设置或连接在一起，所述蜂窝板与感
光组件之间为间隔设置或连接在一起。
进一步地，所述光源通过支架固定于导光板上，所述支架上设置有导光槽，所述光源设置于导光槽内，所述导光槽设置为使光源发射的光线经过其射入导光板内后与 法线之间的夹角为arcsin(n0/n2)至arcsin(n1/n2)；其中，n0为空气折射率；n1为接触导光板的物体表面液体的折射率；n2为导光板折射率。
进一步地，所述蜂窝板由光纤板代替，所述光纤板由密集分布的多个相互平行的光纤组成，所述光纤的一端朝向导光板，另一端朝向感光组件。
一种终端设备，其中包括所述的蜂窝结构的指纹掌纹图像采集器。
采用上述方案后，本发明具有以下有益效果：
1、由导光板、蜂窝板、光源及感光组件组成的蜂窝结构的指纹掌纹图像采集器，其结构紧凑，厚度降低，其当手指或手掌捺印在导光板上后，将破坏光线在导光板内的全反射传播，一部分光线将逸出导光板照射到手指表面或手掌表面，形成散射光，散射光具有多个角度，通过蜂窝板上设置的相互平行的密布通孔，保证只能透过与通孔平行的单一方向的光线，这样可以比较好的屏蔽多个方向的杂散光，而通孔的大小设置为只允许单一光线或光束进入通孔，并且只在很小的范围内成像，如1个像素，且使得被采集的指纹或掌纹大小与采集到的图像大小相等，这些与通孔平行或近似平行的光线将穿过通孔照射到感光组件上产生数字图像信号，对指纹或掌纹采集而言，因为其沟壑状结构，采用平行光感光有助于获得高对比度的图像；即指纹或掌纹捺印后反射回来的单一方向的平行光中，指纹或掌纹脊线反射的光强度会比指纹或掌纹沟壑反射的光强度更大，这样指纹纹线或掌纹纹线的图像就会更清晰；
2、本发明通过在蜂窝板靠近导光板的一面设置漫反射层，这样设计可以进一步破坏导光板内的光的全反射传播，有效解决干手指问题，使其对干湿手指的适应能力提高；
3、将本发明蜂窝结构的指纹掌纹图像采集器集成在终端设备上，使终端设备增加了指纹、掌纹采集功能，该终端设备额外增加的部件少且成本低。
附图说明
构成本申请的一部分的说明书附图用来提供对本发明的进一步理解，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是本发明蜂窝结构的指纹掌纹图像采集器的实施例一结构示意图；
图2是本发明的图像采集器的实施例二结构示意图；
图3是本发明的图像采集器的实施例三结构示意图；
图4是本发明的图像采集器的实施例四结构示意图；
图5是本发明的图像采集器的实施例五结构示意图；
图6是本发明的图像采集器的实施例六结构示意图；
图7是本发明终端设备的实施例一结构示意图；
图8是本发明终端设备的实施例二结构示意图。
具体实施方式
下面结合说明书附图对本发明做进一步的描述。
如图1所示本发明蜂窝结构的指纹掌纹图像采集器的实施例一结构示意图，其包括：
导光板1：导光板1的选材很广泛，例如玻璃板及各种透明材料。
光源2：用于将至少部分光线射入导光板1内，该光源2可以选择用LED灯，或其它发光元件，此处不做限定，所述光源2设置于导光板的侧面和/或上表面和/或下表面，此实施例中光源2设置于导光板1的左侧面，其通过粘接方式或其它固定方式直接固定于导光板1上。
蜂窝板3：本实施例中蜂窝板3间隔设置于所述导光板2的下面，所述蜂窝板3上密布有多个相互平行的通孔4，该通孔4一般选择为圆孔，通孔4的轴心 线与蜂窝板的水平面夹角为大于或等于30°且小于或等于90°，本实施例的夹角为90°。所述通孔4的直径为0.5微米-50微米，优选通孔4的直径大于1微米且小于或等于5.8微米。本实施例中选择各通孔4的直径均相等，也可以选择为直径不相等的多个通孔。该些通孔可以为阵列式排列，也可以为错落式排列。均为本发明保护的范围。在本实施例中通孔的大小设置为只允许单一光线或光束进入通孔，并且只在很小的范围内成像，如1个像素点，当然也可以为大于一个像素点；而采集的指纹或掌纹部分的大小与采集到的指纹或掌纹图像的大小相等，以上均为本发明保护的范围。所述蜂窝板3的厚度是通孔4直径的5倍以上，相邻通孔4之间的孔中心间距为小于或等于50.8微米，此实施例选择50.8微米，这样设计的密布通孔4的图像采集器可以满足500PPI的分辨率要求。当选择相邻通孔4之间的孔中心间距为25.4微米时，该图像采集器可以满足1000PPI的分辨率要求，当选择相邻通孔4之间的孔中心间距为12.7微米时，该图像采集器可以满足2000PPI的分辨率要求。
感光组件5：感光组件5包括CMOS或CCD图像传感器，该实施例感光组件5通过粘接或螺接固定于蜂窝板3的下表面。
使用时，导光板1提供手指或手掌捺印，在手指或手掌未捺印时，光源2发射的光线射入导光板1内，其中有至少部分光线在导光板1内以全反射形式传输，当手指或手掌捺印在导光板1上表面时，由于手指表面或手掌表面的折射率和空气不同，手指或手掌表面有汗液，其折射率与水近似，将破坏光线在导光板1内的全反射传播，一部分光线将逸出导光板1照射到手指表面或手掌表面，形成散射光，散射光具有多个角度，而通过蜂窝板3上相互平行且密布的通孔4，保证只能透过与通孔4平行的单一方向的光线，这样可以比较好的屏蔽多个方向的杂散光，同时使通孔4的大小满足只允许单一光线或光束进入通孔，使采集到的被检测指纹或掌纹部分只在一个像素点上成像，且采集的指纹或掌纹部分大小(即物的大小)与采集到的指纹或掌纹图像大小(即像的大小)相等，其相当于将指纹或掌纹看成是由密布的多个物点(物点大小等于一个像素点大小)构成，这些物点通过各通孔4的平行光传输，将光学信号传输给感光组件5的图像传感器，对指纹或掌纹采集而言，因为其沟壑状结构，采用平行光感光有助于获得高对比度的图像；即指纹或掌纹捺印后反射回来的单一方向的平行光中，指纹或掌纹脊线反射的光强度会比指纹或掌纹沟壑反射的光强度更大，得到的指纹或掌纹图像的对比度提高，这样指纹纹线或掌纹纹线的图像就会更清晰。
本发明利用的是平行光成像原理：保证采集足够小的物，经平行光照射即可成与物大小一致的像。
如图2所示本发明蜂窝结构的指纹掌纹图像采集器的实施例二结构示意图，其大部分结构与上述图1所述实施例结构相同，不同之处在于：光源2设置为两个，其分别通过支架6固定于导光板1的下表面的左右两端，各支架6的上表面分别设置有导光槽7，两个光源2分别放置于两个导光槽7内，导光槽7设置为使其内放置的光源2发射的光线经过其射入导光板1内后与法线之间的夹角α为arcsin(n0/n2)至arcsin(n1/n2)；其中，n0为空气折射率；n1为接触导光板1的物体表面液体的折射率；n2为导光板折射率，该夹角范围是由折射定律推导得出，当n0＝1.0，n1＝1.33，n2＝1.5，此夹角α为41.8度至62.5度之间，此处选择α为45度。这样设计的好处是：在没有手指或手掌接触导光板1时，光源2射入导光板1内的该夹角范围的光线在导光板1内可形成横向全反射传播(见图2的全反射光路示意)，而当手指或手掌接触到导光板1时，光线在导光板1中的全反射传播被破坏，形成散射光，散射光穿过密布的通孔4，在感光组件5上成像。
如图3所示本发明蜂窝结构的指纹掌纹图像采集器的实施例三结构示意图，其大部分结构与上述图1所述实施例结构相同，不同之处在于：感光组件5间隔设置于蜂窝板3的下面，蜂窝板3上的通孔4轴心线向右下方倾斜，该通孔轴线倾与水平面的夹角为大于或等于30°，本实施例选择45°，各通孔4相互平行。
这样设计，当手指或手掌捺印在导光板1上时，破坏了光线在导光板1内的全反射传播，一部分光线将逸出导光板1照射到手指表面或手掌表面，形成各种角度的散射光，而只有与通孔4平行或近似平行，即光线同样为向左下方倾斜，倾斜角度为45°或接近45°的光线可以穿过通孔4照射到感光组件5上，有效减少了外界杂散光线的干扰。而这种沟壑状结构的手指指纹或手掌掌纹，采用该种平行光感光有助于获得高对比度的图像。
如图4所示本发明蜂窝结构的指纹掌纹图像采集器的实施例四结构示意图，其大部分结构与上述图1所述实施例结构相同，不同之处在于：导光板1设置在蜂窝板3的上表面，其中蜂窝板3的上表面粘接有漫反射层8，该漫反射层8可通过在透明胶内掺入漫反射颗粒而制成。漫反射层8的设置是为了进一步破坏导光板1内的光的全反射传播，形成向上的漫反射光线。这样，光线一方面沿导光板1全反射传播，一方面形成散射照明。这种方法类似于一种面光源的实现方法。 漫反射光线将照亮手指或手掌表面，并有一部分平行光线从手指表面或手掌表面反射穿过密布的通孔4成像。指纹或掌纹采集时，采用漫反射照明加平行光成像，能有效解决干手指的问题，并得到清晰指纹图像。
如图5所示本发明蜂窝结构的指纹掌纹图像采集器的实施例五结构示意图，其大部分结构与上述图4所述实施例结构相同，不同之处在于：蜂窝板3上的通孔4轴心线向左下方倾斜，该轴心线与水平面的夹角为大于或等于30°且小于或等于90°，本实施例选择45°，各通孔4相互平行。该蜂窝板3上表面的漫反射层8是由位于各相邻所述通孔4之间设置的凸起结构9组成，该些凸起结构9的设置，进一步破坏导光板1内的光的全反射传播，形成向上的漫反射光线。使光线一方面沿导光板1内全反射传播，另一方面漫反射光线将照亮手指表面，并有一部分平行光线从手指表面反射穿过密布的平行通孔4成像。
如图1-5中所示，蜂窝板设置于导光板的下方。蜂窝板上的多个通孔均贯穿蜂窝板的上表面和下表面，多个通孔的轴心线相互平行，通孔的直径为0.5微米-50微米，蜂窝板的厚度为通孔直径的5倍以上。通孔4的轴心线与蜂窝板的水平面(即蜂窝板的上表面或下表面)垂直，或者通孔4的轴心线相对于蜂窝板的水平面左倾斜或右倾斜，其倾斜角度大于或等于30°且小于或等于90°。
在具体实施的蜂窝板结构中，蜂窝板上相邻通孔之间的孔中心间距小于或等于50.8微米。相邻通孔4之间的孔中心间距选择50.8微米时，这样设计的密布通孔4的图像采集器可以满足500PPI的分辨率要求。当相邻通孔4之间的孔中心间距为25.4微米时，该图像采集器可以满足1000PPI的分辨率要求，当选择相邻通孔4之间的孔中心间距为12.7微米时，该图像采集器可以满足2000PPI的分辨率要求。由此，本领域技术人员在获知上述通孔之间的孔中心间距与图像采集器所具备的分辨率之间的比例关系，可根据预定分辨率来调节通孔之间的孔中心间距。
如图6所示本发明蜂窝结构的指纹掌纹图像采集器的实施例六结构示意图，其大部分结构可与上述图1-图5中任一所述实施例结构相同，不同之处在于：所述蜂窝板3由光纤板10代替，所述光纤板10由密集分布的多个相互平行的光纤粘接而成，所述光纤的一端朝向导光板1，另一端朝向感光组件5。每根光纤独立的将各自的像元素从一端传输到另一端至感光组件5上，各光纤之间互不干扰，这些密集的像元素成在感光组件上结合形成指纹或掌纹图像。
本实施例的其它结构采用与图4所述实施例结构相同，其采集图像的原理与上述实施例中的蜂窝板原理相同，且用光纤板采集图像的技术已有利用，此处不再赘述。
上述所述各蜂窝结构的指纹掌纹图像采集器可应用于各种终端设备中。在应用中，所述图像采集器可作为独立模块对指纹或掌纹进行采集。如图7所示本发明终端设备的实施例一结构示意图，该终端设备11上设置有如上述图1-图6任一所述图像采集器12，该图像采集器12设置于终端设备11的边缘位置上，该终端设备11如手机，可以在其HOME键上设置。该终端设备11增加了指纹、掌纹采集功能，该终端设备11额外增加的部件少且成本低。
如图8所示本发明终端设备的实施例二结构示意图，其包括上述图1-图6任一所述图像采集器12，该图像采集器12为独立器件，其与终端设备11通过导线和接口互相连接。
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本发明的其它实施方案。本申请旨在涵盖本发明的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本发明的一般性原理并包括未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本发明的真正范围和精神由下面的权利要求指出。
应当理解的是，本发明并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其范围进行各种修改和改变。本发明的范围仅由所附的权利要求来限制。

Claims (10)

  1. 一种蜂窝结构的指纹掌纹图像采集器，其特征在于，包括导光板及用于将至少部分光线射入导光板内的光源，所述导光板的一面设置有蜂窝板，所述蜂窝板上密布有多个相互平行的通孔，所述通孔的直径为0.5微米-50微米，且被采集的指纹或掌纹大小与采集到的图像大小相等，所述蜂窝板的厚度是通孔直径的5倍以上，相邻通孔之间的孔中心间距小于或等于50.8微米，所述蜂窝板的另一面设置有感光组件。
  2. 如权利要求1所述的蜂窝结构的指纹掌纹图像采集器，其特征在于，所述通孔的轴心线与蜂窝板的水平面夹角为大于或等于30°且小于或等于90°。
  3. 如权利要求2所述的蜂窝结构的指纹掌纹图像采集器，其特征在于，所述光源设置于导光板的侧面和/或上表面和/或下表面。
  4. 如权利要求1所述的蜂窝结构的指纹掌纹图像采集器，其特征在于，所述蜂窝板正对着导光板的一面设置有漫反射层。
  5. 如权利要求4所述的蜂窝结构的指纹掌纹图像采集器，其特征在于，所述漫反射层由设置于各相邻所述通孔之间的凸起结构组成。
  6. 如权利要求5所述的蜂窝结构的指纹掌纹图像采集器，其特征在于，所述导光板与蜂窝板之间为间隔设置或连接在一起，所述蜂窝板与感光组件之间为间隔设置或连接在一起。
  7. 如权利要求1所述的蜂窝结构的指纹掌纹图像采集器，其特征在于，所述光源通过支架固定于导光板上，所述支架上设置有导光槽，所述光源设置于导光槽内，所述导光槽设置为使光源发射的光线经过其射入导光板内后与法线之间的夹角为arcsin(n0/n2)至arcsin(n1/n2)；其中，n0为空气折射率；n1为接触导光板的物体表面液体的折射率；n2为导光板折射率。
  8. 如权利要求1-7之一所述的蜂窝结构的指纹掌纹图像采集器，其特征在于，所述蜂窝板由光纤板代替，所述光纤板由密集分布的多个相互平行的光纤组成，所述光纤的一端朝向导光板，另一端朝向感光组件。
  9. 一种终端设备，其特征在于，包括权利要求1-8之一所述的蜂窝结构的指纹掌纹图像采集器。
  10. 一种蜂窝结构的指纹掌纹图像采集器，其特征在于，包括导光板、蜂窝板和用于将至少部分光线射入导光板内的光源，所述蜂窝板设置于所述导光板的下方，所述蜂窝板的上表面和下表面之间设有多个相互平行的通孔，所述通孔的直径为0.5微米-50微米，所述蜂窝板的厚度是通孔直径的5倍以上，所述蜂窝板的下表面设置有感光组件。
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US15/539,938 US10482304B2 (en) 2015-01-29 2015-10-28 Fingerprint and palmprint image collector with honeycomb structure, and terminal device
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