WO2020037508A1 - 镜头系统、指纹识别装置和终端设备 - Google Patents

镜头系统、指纹识别装置和终端设备 Download PDF

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Publication number
WO2020037508A1
WO2020037508A1 PCT/CN2018/101594 CN2018101594W WO2020037508A1 WO 2020037508 A1 WO2020037508 A1 WO 2020037508A1 CN 2018101594 W CN2018101594 W CN 2018101594W WO 2020037508 A1 WO2020037508 A1 WO 2020037508A1
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WIPO (PCT)
Prior art keywords
lens
lens system
focal length
fingerprint
optical
Prior art date
Application number
PCT/CN2018/101594
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English (en)
French (fr)
Inventor
李林欣
龙卫
Original Assignee
深圳市汇顶科技股份有限公司
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 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to CN201880001315.4A priority Critical patent/CN109196521B/zh
Priority to EP18930531.1A priority patent/EP3825901B1/en
Priority to CN202011062504.8A priority patent/CN112036374B/zh
Priority to PCT/CN2018/101594 priority patent/WO2020037508A1/zh
Priority to CN201920739930.7U priority patent/CN209895353U/zh
Publication of WO2020037508A1 publication Critical patent/WO2020037508A1/zh
Priority to US17/134,138 priority patent/US11774708B2/en

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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
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/24—Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
    • 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 embodiments of the present application relate to the field of optical imaging, and more specifically, to a lens system, a fingerprint recognition device, and a terminal device.
  • under-screen fingerprint recognition technology has become a technical trend because it does not occupy physical locations on electronic devices.
  • the current under-screen fingerprint technology is based on the principle of light collimation.
  • the resolution of optical fingerprint modules is determined by light.
  • the distribution period and the aspect ratio of the collimation unit determine that if the size of the optical fingerprint module is limited, the resolution of the fingerprint recognition is low, which affects the accuracy and security of the fingerprint recognition.
  • the present application provides a lens system, a fingerprint recognition device, and a terminal device, which can collect a larger range of fingerprint information when the size of the fingerprint module is limited, can improve the resolution of the fingerprint recognition, and thus can improve Accuracy and security of fingerprint recognition.
  • a lens system including: a first lens, a second lens, and a third lens which are sequentially arranged from the object side to the image side, wherein the first lens is a meniscus shape with a concave object side A negative power lens, the second lens is a positive power lens with convex surfaces on both the object side and the image surface side, and the third lens is a lens with positive powers on both the object side and the image surface side;
  • the parameters of the lens system satisfy a first relationship, so that the field of view angle FOV of the lens system is greater than a first threshold, wherein the parameters of the lens system include at least two of the following: the first lens , The focal length of the second lens, the focal length of the third lens, the combined focal length of the first lens and the second lens, the combined focal length of the second lens and the third lens, the The focal length of the lens system.
  • the lens system of the embodiment of the present application satisfies the first relationship by arranging lenses with different optical powers and setting the parameters of the lens system, so that the lens system has a large FOV performance, thereby improving the optical fingerprint recognition using the lens system.
  • the fingerprint recognition performance of the module satisfies the first relationship by arranging lenses with different optical powers and setting the parameters of the lens system, so that the lens system has a large FOV performance, thereby improving the optical fingerprint recognition using the lens system.
  • the first relationship is: 1.0 ⁇ f 12 / f 3 ⁇ 2.7, where f 12 is a combined focal length of the first lens and the second lens, and f 3 is the The focal length of the third lens.
  • the first threshold value is 120 degrees.
  • the maximum image height Y ′, the focal length f, and the distance TTL from the lower surface of the display screen to the imaging surface of the lens system satisfy the second relationship, so that the lens system ’s
  • the focal length is less than a second threshold.
  • the second relationship is: 0.4 ⁇ Y '/ (f * TTL) ⁇ 0.5.
  • the lens system further includes:
  • a diaphragm is disposed between the second lens and the third lens.
  • At least one surface in the lens system is an aspheric surface.
  • the TV distortion of the lens system is less than 5%
  • the relative degree of the lens system is greater than 30%
  • the F number of the lens system is less than 1.5.
  • At least one of a radius of curvature, a thickness, a material, an effective diameter, and a conic coefficient of each surface in the lens system may be set, and / or an aspheric higher order of an aspheric lens in the lens system Term coefficients, for example, A2, A4, A6, A8, A10, A12, A14, A16, so that the parameters of the lens system satisfy the first relationship and the second relationship, so that the FOV of the lens system is greater than 120 degrees,
  • the TV distortion is less than 5%
  • the F number is less than 1.5
  • the contrast is greater than 30%.
  • a fingerprint recognition device including:
  • the lens system in the first aspect or any possible implementation manner of the first aspect is not limited
  • the fingerprint identification device further includes:
  • An image sensor is disposed below the lens system, and is configured to receive an optical signal transmitted by the lens system and process the optical signal to obtain fingerprint information included in the optical signal.
  • the fingerprint recognition device further includes: a bracket,
  • the lens system is interference-fitted in the bracket.
  • a terminal device including:
  • the lens system in the first aspect or any possible implementation manner of the first aspect is not limited
  • the terminal device further includes:
  • a screen assembly including a display screen, foam and copper foil, which is disposed above a lens system in the fingerprint identification device;
  • the areas corresponding to the foam and the copper foil above the lens system are opened to allow optical signals including fingerprint information to enter the lens system.
  • FIG. 1 is a schematic structural diagram of a terminal device applicable to an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of a lens system according to an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of an optical fingerprint recognition module according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a layout of a lens system according to an embodiment of the present application.
  • FIG. 5 is a comparison diagram of the lens system of the layout shown in FIG. 4.
  • FIG. 6 is an astigmatism diagram of the lens system of the layout shown in FIG. 4.
  • FIG. 7 is a TV distortion diagram of the lens system of the layout shown in FIG. 4.
  • FIG. 8 is an MTF diagram of the lens system of the layout shown in FIG. 4.
  • FIG. 9 is a schematic diagram of another layout of a lens system according to an embodiment of the present application.
  • FIG. 10 is a comparison diagram of the lens system of the layout shown in FIG. 9.
  • FIG. 11 is an astigmatism diagram of the lens system of the layout shown in FIG. 9.
  • FIG. 12 is a TV distortion diagram of the lens system of the layout shown in FIG. 9.
  • FIG. 13 is an MTF diagram of the lens system of the layout shown in FIG. 9.
  • FIG. 14 is a schematic diagram of another layout of a lens system according to an embodiment of the present application.
  • FIG. 15 is a comparison diagram of the lens system of the layout shown in FIG. 14.
  • FIG. 16 is an astigmatism diagram of the lens system of the layout shown in FIG. 14.
  • FIG. 17 is a TV distortion diagram of the lens system of the layout shown in FIG. 14.
  • FIG. 18 is an MTF diagram of the lens system of the layout shown in FIG. 14.
  • FIG. 19 is a schematic structural diagram of a fingerprint recognition device according to an embodiment of the present application.
  • FIG. 20 is a schematic block diagram of a terminal device according to an embodiment of the present application.
  • embodiments of the present application can be applied to optical fingerprint systems, including but not limited to optical fingerprint recognition systems and medical diagnostic products based on optical fingerprint imaging.
  • the embodiments of this application only use the optical fingerprint system as an example, but should not The embodiments of the application constitute any limitation, and the embodiments of the present application are also applicable to other systems using optical imaging technology.
  • biometric identification in addition to fingerprint identification, the technical solutions of the embodiments of the present application can also perform other biometric identification, such as biometric identification, which is not limited in the embodiments of the present application.
  • the optical fingerprint system provided in the embodiments of the present application can be applied to smart phones, tablet computers, and other mobile terminals with display screens or other terminal devices. More specifically, in the above terminal devices, fingerprint collection The device may be specifically an optical fingerprint device, which may be disposed in a partial area or the entire area below the display screen, thereby forming an under-display optical fingerprint system.
  • FIG. 1 is a schematic structural diagram of a terminal device applicable to the embodiment of the present application.
  • the terminal device 700 includes a display screen 720 and an optical fingerprint device 730.
  • the optical fingerprint device 730 is disposed below the display screen 720. Local area.
  • the optical fingerprint device 730 includes a sensing array having a plurality of optical sensing units, and a region where the sensing array is located is a fingerprint detection area 703 of the optical fingerprint device 730.
  • the fingerprint detection area 703 is located in the display area 702 of the display screen 720. Therefore, when the user needs to unlock the terminal device or perform other fingerprint verification, he only needs to press his finger In the fingerprint detection area 703 located on the display screen 720, fingerprint input can be realized. Since the fingerprint detection can be implemented in the screen, the terminal device 700 adopting the above structure does not need a special reserved space on the front side to set fingerprint keys (such as the Home key).
  • the display screen 720 may be a display screen with a self-emitting display unit, such as an organic light-emitting diode (OLED) display or a micro-LED display. Screen.
  • the optical fingerprint device 730 may use a display unit (ie, an OLED light source) of the OLED display 720 located in the fingerprint detection area 703 as an excitation light source for optical fingerprint detection.
  • the sensing array of the optical fingerprint device 730 is specifically a photodetector array, which includes a plurality of photodetectors distributed in an array, and the photodetectors can be used as the optical sensing unit described above.
  • the light emitted from the display unit of the fingerprint detection area 703 reflects on the fingerprint on the surface of the finger and forms reflected light, wherein the reflected light of the ridge and valley of the finger fingerprint is different
  • the reflected light is received from the display screen 720 and received by the photodetector array and converted into a corresponding electrical signal, that is, a fingerprint detection signal; based on the fingerprint detection signal, fingerprint image data can be obtained, and can be further processed. Fingerprint matching verification, so as to realize the optical fingerprint identification function in the terminal device 700.
  • the terminal device 700 further includes a transparent protective cover 710, which may be a glass cover or a sapphire cover, which is located above the display screen 720 and covers all The front of the terminal device 700 is described. Because, in the embodiment of the present application, the so-called finger pressing on the display screen 720 actually means pressing the cover plate 710 above the display screen 720 or the surface of the protective layer covering the cover plate 710.
  • the optical fingerprint device 730 includes a light detection portion 734 and an optical component 732.
  • the light detection portion 734 includes the sensing array and is electrically connected to the sensing array.
  • the read circuit and other auxiliary circuits can be fabricated on a chip by a semiconductor process; the optical component 732 can be disposed above the sensing array of the light detection portion 134, and can include a filter layer. (Filter), light guide layer, and other optical elements, the filter layer can be used to filter out ambient light penetrating the finger, and the light guide layer is mainly used to guide the reflected light reflected from the finger surface to the The sensing array performs optical detection.
  • the optical component 732 may be packaged in the same optical fingerprint chip as the light detection portion 134.
  • the light guide layer may be a lens layer made of a semiconductor silicon wafer, which has a plurality of lens units, and the reflected light reflected from a finger passes through the lens unit and is reflected by the optics below it.
  • the sensing unit receives, and accordingly, the sensing array can detect a fingerprint image of a finger.
  • each lens unit may correspond to one of the optical sensing units of the sensing array; alternatively, the lens unit and the optical sensing unit of the sensing array may be non-optical.
  • One-to-one correspondence to reduce the occurrence of moiré interference can correspond to multiple lens units, or the lens units can also be arranged in an irregular manner; lens units that use an irregular arrangement can pass Later software algorithms correct the reflected light detected by each sensing unit.
  • the display screen 720 may also be a non-self-emitting display screen, such as a backlit liquid crystal display screen; in this case, the optical detection device 730 cannot use the display screen 720
  • the display unit is used as an excitation light source. Therefore, it is necessary to integrate an excitation light source inside the optical detection device 730 or to set an excitation light source outside to implement optical fingerprint detection. The detection principle is consistent with the above description.
  • the inductive array in the optical fingerprint device may also be referred to as an image sensor (Sensor) or a photoelectric sensor, and may be made into a DIE after being processed by a semiconductor process, that is, the DIE includes an image sensor.
  • an image sensor Sensor
  • a photoelectric sensor a photoelectric sensor
  • optical fingerprint device in the embodiments of the present application may also be referred to as an optical fingerprint identification module, a fingerprint identification device, a fingerprint identification module, a fingerprint module, a fingerprint collection device, and the like.
  • FOV Field of View
  • the larger the FOV of the lens the larger the information that the lens can obtain, that is, the information that can be obtained by using the lens A larger amount.
  • the F number is used to characterize the amount of light entering the sensor array of the optical fingerprint device through the lens. The smaller the F number, the greater the amount of light entering the lens.
  • TV distortion is used to measure the degree of visual distortion of an image. It can be understood that the smaller the TV distortion, the better the imaging effect.
  • Relative contrast can refer to the ratio of the illuminance of different coordinate points on the imaging surface to the illuminance of the central point.
  • the smaller the relative contrast the more uneven the illumination of the imaging surface, which is prone to the problem of underexposure or overexposure in some locations.
  • the imaging quality that is, the greater the contrast, the higher the imaging quality.
  • FIG. 2 is a schematic structural diagram of a lens system according to an embodiment of the present application.
  • the lens system 10 includes: a first lens 11, a second lens 12, and a third lens which are sequentially arranged from the object side to the image side.
  • the first lens is a meniscus negative-power lens with a concave surface on the object side (that is, the side near the object side), and the second lens is the object side and the image surface side (that is, the side near the image side) One side) is a convex positive power lens, and the third lens is a lens having a convex positive power on both the object side and the image surface side.
  • the concave or convex surface on the object side refers to the unevenness of the surface of the lens along the optical axis direction.
  • the convex or concave surface on the image side refers to the light on the image side of the lens. The unevenness of the surface in the axial direction.
  • the first lens 11 may be a concave lens
  • the second lens 12 may be a convex lens
  • the third lens may be a convex lens
  • the first lens may be a concave lens, or may be a group of lenses, as long as the combined power of the group of lenses is negative, similarly, the first lens
  • the two lenses may also be a convex lens, or may be a group of lenses, as long as the combined power of the group of lenses is positive, similarly, the same is true for the third lens, and details are not described herein.
  • the first lens, the second lens, and the third lens may be made of resin materials or other plastic materials, which are not limited in the embodiments of the present application.
  • the parameters of the lens system are set to satisfy a first relationship, so that the FOV of the lens system is greater than a first threshold.
  • the parameters of the lens system may include at least two of the following: Focal length of a lens, focal length of the second lens, focal length of the third lens, combined focal length of the first lens and the second lens, combined focal length of the second lens and the third lens The focal length of the lens system.
  • the parameters of the lens system satisfying the first relationship may be that the ratio of the focal lengths of the first lens and the second lens is within a specific range, or the combined focal length of the first lens and the second lens and the focal length of the third lens
  • the ratio of the ratio is within a specific range, or the ratio of the focal length of the first lens to the combined focal length of the second lens and the third lens is within a specific range, etc., which is not limited in the embodiment of the present application.
  • the first relationship may be: 1.0 ⁇ f 12 / f 3 ⁇ 2.7, where f 12 is a combined focal length of the first lens and the second lens, and f 3 is A focal length of the third lens.
  • the ratio of the combined focal length of the first lens and the second lens to the focal length of the third lens can be set within a certain range, so that the lens system can have a large FOV characteristic.
  • the fingerprint recognition module using this lens system can collect fingerprint information of a larger area, which can further improve the accuracy and security of fingerprint recognition.
  • the first threshold value is 120 degrees.
  • the FOV of the lens system is greater than 120 degrees. In this way, when the lens size is the same, fingerprint information of a larger area can be collected, which is helpful to improve the fingerprint recognition. Resolution.
  • the F-number of the lens system is less than 1.6, which enables enough light to enter the lens system, which is beneficial for collecting weak fingerprint signals, and can also shorten exposure time and power consumption.
  • the TV distortion of the lens system is less than 5%, which is beneficial to avoid the influence of moiré on fingerprint imaging.
  • the relative degree of the lens system is greater than 30%, which is beneficial to improving the imaging quality.
  • the lens system of the embodiment of the present application satisfies the first relationship by arranging lenses of different optical powers and by setting the parameters of the lens system, so that the lens system has a large FOV, a small working F number, a small TV distortion, and a large degree of contrast.
  • the performance is beneficial to improve the fingerprint recognition performance of the fingerprint recognition module using the lens system.
  • the maximum image height Y ′, the focal length f, and the distance TTL that is, the total optical height
  • the distance TTL that is, the total optical height
  • the size of the TTL determines the focal length of the lens system, or the size of the lens system.
  • the lens system can be used at With a larger FOV, it also has a shorter focal length, so that the lens system can be better applied to terminal devices that require size.
  • the display screen here can be the display screen in the electronic equipment installed in the lens system, and the imaging surface can be understood as the surface of the image sensor.
  • the image sensor can correspond to the DIE in the optical fingerprint recognition module.
  • Optical signal detection part Optical signal detection part.
  • the second relationship may be: 0.4 ⁇ Y '/ (f * TTL) ⁇ 0.5.
  • the second threshold may be 5 millimeters, 3 millimeters, or the like, which is not limited in the embodiment of the present application, as long as it can meet the size requirements of the terminal device.
  • the lens system further includes:
  • a diaphragm is disposed between the second lens and the third lens.
  • the diaphragm can be used to adjust the size of the optical signal or imaging range.
  • the optical signal with fingerprint information can be imaged to the greatest extent in the optical fingerprint recognition module.
  • the surface of the image sensor enables the image sensor to obtain more fingerprint information, which can further improve the resolution of fingerprint recognition.
  • the lens system of the embodiment of the present application is a wide-angle short-focus lens.
  • the wide-angle design enables the lens system to collect fingerprint information of a larger area.
  • the short-focus design allows the lens system to occupy a smaller space, so the lens system. While achieving better fingerprint recognition performance, it can also meet the size requirements of the terminal equipment, enhancing the applicability of the lens system.
  • the curvature radius, thickness, material, effective diameter, and diameter of each structural component (for example, the first lens, the second lens, the diaphragm, and the third lens) in the lens system may be controlled.
  • Physical parameters such as conic coefficient, and / or aspheric higher-order coefficients of aspheric lenses in the lens system (for example, even-order terms in A2 to A16), so that the parameters of the lens system satisfy the above-mentioned first
  • the relationship and the second relationship further make the FOV of the lens system greater than 120 degrees, the TV distortion of the lens system is less than 5%, the relative degree of the lens system is greater than 30%, and the F number of the lens system is less than 1.5. It is described in detail in combination with specific embodiments.
  • the lens system in the embodiment of the present application can be applied to an optical fingerprint recognition module, and the lens system can cooperate with an image sensor in the optical fingerprint recognition module to realize fingerprint information of a larger area in a limited space.
  • the lens system can also be applied to other equipment or devices that have high requirements on optical imaging performance, which is not limited in the embodiments of the present application.
  • the optical fingerprint recognition module 200 may include: an infrared filter (IR filter) 201, an IR filter adhesive 202, a chip (DIE) 203, a DIE adhesive 204, A flexible printed circuit (FPC) 205, a reinforcing plate 206, a bracket 207, and a lens system 209.
  • IR filter infrared filter
  • DIE chip
  • FPC flexible printed circuit
  • the IR Filter is used to filter infrared light to prevent infrared light from affecting fingerprint imaging;
  • the IR filter bonding adhesive 202 is used for bonding the IR filter 201 and the DIE203;
  • DIE203 corresponding to the light detection section 734 in FIG. 1, is used to convert an optical signal into an electrical signal, and can be used in conjunction with the lens system 209 to convert the optical signal imaged by the lens system 209 into an electrical signal;
  • DIE adhesive 204 is used to fix DIE203 and Flexible Printed Circuit (FPC) 205.
  • FPC Flexible Printed Circuit
  • FPC205 for connecting the circuit in the electronic device installed in the DIE203 and the optical fingerprint recognition module
  • a bracket 207 is used to fix the lens system 209 and DIE203 to control the accuracy of defocus and eccentricity.
  • a display screen module is further disposed above the optical fingerprint identification module 200, and includes a display screen 320, foam 310, and copper foil 300.
  • the lens system 209 can be interference-fitted into the bracket 207 to make the lens system 209 and DIE203 fit together.
  • Each structural component of the optical fingerprint recognition module can be glued on Together, the optical fingerprint recognition module can be fixed in the middle frame 208 of the electronic device.
  • the foam 310 and aluminum foil 300 in the display module corresponding to the lens system 209 need to be opened to make the FOV of the lens system 209.
  • Optical signals in the range can pass.
  • the lens system each includes three groups of lenses and a diaphragm.
  • FIG. 4, FIG. 9, and FIG. 14 show three layouts of the lens systems of Embodiments 1 to 3, respectively.
  • the display screen 20, the first lens 21, the second lens 22, the diaphragm, the third lens 23, the IR filter, and the filter bonding are sequentially arranged from the object side to the image side. gum.
  • the first lens 21, the second lens 22, and the third lens 23 respectively correspond to the first lens 11, the second lens 12, and the third lens 13 described above, that is, the first lens 21 is a concave lens.
  • the second lens 22 is a convex lens
  • the third lens 23 is a convex lens.
  • the upper and lower surfaces of the display screen 20 are denoted as S1 and S2 in order from the object side to the image side
  • the two surfaces of the first lens 21 are denoted as S3 and S4
  • the The two surfaces are denoted as S5 and S6
  • the surface of the diaphragm is denoted as S7
  • the two surfaces of the third lens 23 are denoted as S8 and S9
  • the surface of the IR filter is denoted as S10 and S11, respectively.
  • the surface of the glue 26 is denoted as S12 and S13
  • the imaging surface is S14.
  • a curvature radius, a thickness, a material, an effective diameter, and a conic coefficient of each surface in the lens system, and / or an aspheric higher-order term coefficient of an aspheric lens in the lens system A2, A4, A6, A8, A10, A12, A14, A16, so that the parameters of the lens system satisfy the above-mentioned first and second relationships, so that the FOV of the lens system is greater than 120 degrees, and the TV distortion is less than 5%.
  • the F number is less than 1.5, and the relative degree is greater than 30%.
  • the first relationship is described as: 1.0 ⁇ f 12 / f 3 ⁇ 2.7
  • the second relationship is: 0.4 ⁇ Y '/ (f * TTL) ⁇ 0.5 as an example, but the present application is not limited thereto.
  • the curvature radius, thickness, material, effective diameter, and conic coefficient of each of the surfaces in S1 to S14 can be set using the corresponding parameters in Table 1.
  • the aspheric aspheric surface of S1 to S14 has a higher order.
  • the term coefficient uses the parameters shown in Table 2.
  • blanks corresponding to the parameters in Tables 1 to 6 in the embodiments of the present application indicate that there is no such parameter.
  • blanks at the material can represent air.
  • the parameters of S12 and S13 are not shown because S11 and S12 are the same.
  • Surface, S13 and S14 are the same surface, so the parameters of S12 and S13 are not shown.
  • FIG. 5 to FIG. 8 are the relative degree diagram, astigmatism diagram, TV distortion diagram, and optical transfer function (MTF) diagram of the lens system in this order.
  • the lens system has a FOV of 124 degrees, an operating F number of 1.223, a TV distortion of -2.028%, and a contrast ratio of 41.0%. Therefore, in the case where the parameters of the lens system satisfy the aforementioned first relationship and second relationship, the lens system has the performance of large FOV, small working F-number, small TV distortion, and high contrast.
  • Example 2 the curvature radius, thickness, material, effective diameter, and conic coefficient of each of the surfaces in S1 to S14 can be set using the corresponding parameters in Table 3.
  • the term coefficient uses the parameters shown in Table 4.
  • FIG. 10 to FIG. 13 are the relative degree diagram, astigmatism diagram, TV distortion diagram, and MTF diagram of the lens system in this order.
  • the FOV of the lens system is 123 degrees
  • the working F number is 1.247
  • the TV distortion is -2.21%
  • the contrast is 34.6%. Therefore, in the case where the parameters of the lens system satisfy the aforementioned first relationship and second relationship, the lens system has the performance of large FOV, small working F-number, small TV distortion, and high contrast.
  • the curvature radius, thickness, material, effective diameter, and conic coefficient of each of the surfaces in S1 to S14 can be set to use the corresponding parameters in Table 5.
  • the term coefficient uses the parameters shown in Table 6.
  • FIG. 15 to FIG. 18 are the relative degree diagram, astigmatism diagram, TV distortion diagram, and MTF diagram of the lens system in this order.
  • the FOV of the lens system is 120 degrees
  • the working F number is 1.240
  • the TV distortion is 1.755%
  • the contrast degree is 45.8%. Therefore, in the case where the parameters of the lens system satisfy the aforementioned first relationship and second relationship, the lens system has the performance of large FOV, small working F-number, small TV distortion, and high contrast.
  • the lens system of the embodiment of the present application provides a wide-angle short-focus lens.
  • Using the lens system can collect fingerprint information of a larger area, and the short-focus design enables the lens system to be better applied to the requirements of size On the terminal equipment, the applicability of the lens system is enhanced.
  • FIG. 19 is a schematic block diagram of a fingerprint recognition device according to an embodiment of the present application.
  • the fingerprint recognition device 400 may include a lens system 401, which may be the lens system 10 in the foregoing embodiment.
  • the fingerprint recognition device may include an image sensor 402 disposed below the lens system 401, for receiving the optical signal processed by the lens system and processing the optical signal to obtain the optical signal. Included fingerprint information.
  • the fingerprint identification device 400 corresponds to the optical fingerprint identification module 200 shown in FIG. 3, and the fingerprint identification device 400 may further include a structure in the optical fingerprint identification module 200, for example, an IR filter 201, The bracket 207 and the like are not described in detail here.
  • the terminal device 500 includes a fingerprint identification device 510.
  • the fingerprint identification device 510 may be the fingerprint identification device 400 in the foregoing embodiment, or shown in FIG.
  • the terminal device may further include a screen assembly 520, including a display screen, foam and copper foil, which is disposed above the lens system in the fingerprint identification device 510;
  • the areas corresponding to the foam and the copper foil above the lens system are opened to allow optical signals including fingerprint information to enter the lens system.
  • the terminal device 500 may be a mobile phone, a tablet computer, a notebook computer, a desktop computer, an in-vehicle electronic device, or a wearable smart device.
  • the wearable smart device includes a full-featured, large-sized, and smart device Mobile phones implement full or partial functions, such as smart watches or smart glasses, and only focus on certain types of application functions, and need to be used in conjunction with other devices such as smart phones, such as various types of smart bracelets and smart jewelry for physical sign monitoring. And other equipment.

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Abstract

一种镜头系统（10）、指纹识别装置（400）和终端设备（500），包括：从物方到像方依次设置的第一镜头（11）、第二镜头（12）和第三镜头（13），其中：所述第一镜头（11）为物体侧为凹面的弯月形负光焦度镜片，所述第二镜头（12）为物体侧与像面侧都是凸面的正光焦度镜片，所述第三镜头（13）为物体侧与像面侧都是凸面正光焦度的镜片，所述镜头系统（10）的参数满足第一关系，以使所述镜头系统（10）的视场角FOV大于第一阈值，其中，所述镜头系统（10）的参数包括以下中的至少两项：所述第一镜头（11）的焦距、所述第二镜头（12）的焦距、所述第三镜头（13）的焦距、所述第一镜头（11）和所述第二镜头（12）的组合焦距、所述第二镜头（12）和所述第三镜头（13）的组合焦距、所述镜头系统（10）的焦距。

Description

镜头系统、指纹识别装置和终端设备 技术领域
本申请实施例涉及光学成像领域，并且更具体地，涉及镜头系统、指纹识别装置和终端设备。
背景技术
随着指纹识别传感器的发展，屏下指纹识别技术由于不占用电子设备上的物理位置，成为一种技术趋势，目前的屏下指纹技术基于光准直原理，光学指纹模组的分辨率由光准直单元的分布周期和深宽比决定，若光学指纹模组的尺寸受限的话，指纹识别的解析力较低，影响指纹识别的准确率和安全性。
发明内容
本申请提供一种镜头系统、指纹识别装置和终端设备，能够在指纹模组的尺寸受限的情况下，实现对较大范围的指纹信息的采集，能够提升指纹识别的解析力，从而能够提升指纹识别的准确率和安全性。
第一方面，提供了一种镜头系统，包括：从物方到像方依次设置的第一镜头、第二镜头和第三镜头，其中，所述第一镜头为物体侧为凹面的弯月形负光焦度镜片，所述第二镜头为物体侧与像面侧都是凸面的正光焦度镜片，所述第三镜头为物体侧与像面侧都是凸面正光焦度的镜片；
并且，所述镜头系统的参数满足第一关系，以使所述镜头系统的视场角FOV大于第一阈值，其中，所述镜头系统的参数包括以下中的至少两项：所述第一镜头的焦距、所述第二镜头的焦距、所述第三镜头的焦距、所述第一镜头和所述第二镜头的组合焦距、所述第二镜头和所述第三镜头的组合焦距、所述镜头系统的焦距。
因此，本申请实施例的镜头系统通过布局不同光焦度的镜头，以及通过设置镜头系统的参数满足第一关系，使得镜头系统具有FOV大的性能，从而能够提升采用该镜头系统的光学指纹识别模组的指纹识别性能。
在一些可能的实现方式中，所述第一关系为：1.0<f 12/f 3<2.7，其中，f 12为所述第一镜头和所述第二镜头的组合焦距，f 3为所述第三镜头的焦距。
在一些可能的实现方式中，所述第一阈值为120度。
在一些可能的实现方式中，所述镜头系统的成像面上的最大像高Y'、焦距f和从显示屏的下表面到成像面的距离TTL满足第二关系，以使所述镜头系统的焦距小于第二阈值。
在一些可能的实现方式中，所述第二关系为：0.4<Y'/(f*TTL)<0.5。
在一些可能的实现方式中，所述镜头系统还包括：
光阑，设置于所述第二镜头和所述第三镜头之间。
在一些可能的实现方式中，所述镜头系统中的至少一个面为非球面。
在一些可能的实现方式中，所述镜头系统的TV畸变小于5％，所述镜头系统的相对照度大于30％，所述镜头系统的F数小于1.5。
可选地，可以通过设置该镜头系统中的每个面的曲率半径、厚度、材料、有效直径、圆锥系数中的至少一项，和/或该镜头系统中的非球面透镜的非球面高次项系数，例如，A2、A4、A6、A8、A10、A12、A14、A16，以使该镜头系统的参数满足该第一关系和该第二关系，从而使得该镜头系统的FOV大于120度，TV畸变小于5％，F数小于1.5，以及相对照度大于30％。
第二方面，提供了一种指纹识别装置，包括：
如第一方面或第一方面的任一可能的实现方式中的镜头系统。
在一种可能的实现方式中，所述指纹识别装置还包括：
图像传感器，设置于所述镜头系统的下方，用于接收经所述镜头系统传输后的光信号，并对所述光信号进行处理，以获取所述光信号中包括的指纹信息。
在一种可能的实现方式中，所述指纹识别装置还包括：支架，
其中，所述镜头系统过盈装配于所述支架中。
第三方面，提供了一种终端设备，包括：
如第一方面或第一方面的任一可能的实现方式中的镜头系统。
在一种可能的实现方式中，所述终端设备还包括：
屏幕组件，包括显示屏、泡棉和铜箔，设置于所述指纹识别装置中的镜头系统的上方；
其中，所述镜头系统上方对应的所述泡棉和所述铜箔的区域开孔，以使包括指纹信息的光信号进入所述镜头系统。
附图说明
图1是本申请实施例所适用的终端设备的结构示意图。
图2根据本申请实施例的镜头系统的结构示意图。
图3根据本申请实施例的光学指纹识别模组的结构示意图。
图4是根据本申请实施例的镜头系统的一种布局的示意图。
图5是图4所示的布局的镜头系统的相对照度图。
图6是图4所示的布局的镜头系统的像散图。
图7是图4所示的布局的镜头系统的TV畸变图。
图8是图4所示的布局的镜头系统的MTF图。
图9是根据本申请实施例的镜头系统的另一种布局的示意图。
图10是图9所示的布局的镜头系统的相对照度图。
图11是图9所示的布局的镜头系统的像散图。
图12是图9所示的布局的镜头系统的TV畸变图。
图13是图9所示的布局的镜头系统的MTF图。
图14是根据本申请实施例的镜头系统的再一种布局的示意图。
图15是图14所示的布局的镜头系统的相对照度图。
图16是图14所示的布局的镜头系统的像散图。
图17是图14所示的布局的镜头系统的TV畸变图。
图18是图14所示的布局的镜头系统的MTF图。
图19是根据本申请实施例的指纹识别装置的结构示意图。
图20是根据本申请实施例的终端设备的示意性框图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
应理解，本申请实施例可以应用于光学指纹系统，包括但不限于光学指纹识别系统和基于光学指纹成像的医疗诊断产品，本申请实施例仅以光学指纹系统为例进行说明，但不应对本申请实施例构成任何限定，本申请实施例同样适用于其他采用光学成像技术的系统等。
还应理解，本申请实施例的技术方案除了可以进行指纹识别外，还可以进行其他生物特征识别，例如，活体识别等，本申请实施例对此也不限定。
作为一种常见的应用场景，本申请实施例提供的光学指纹系统可以应用 在智能手机、平板电脑以及其他具有显示屏的移动终端或者其他终端设备；更具体地，在上述终端设备中，指纹采集装置可以具体为光学指纹装置，其可以设置在显示屏下方的局部区域或者全部区域，从而形成屏下(Under-display)光学指纹系统。
如图1所示为本申请实施例可以适用的终端设备的结构示意图，所述终端设备700包括显示屏720和光学指纹装置730，其中，所述光学指纹装置730设置在所述显示屏720下方的局部区域。所述光学指纹装置730包括具有多个光学感应单元的感应阵列，所述感应阵列所在区域为所述光学指纹装置730的指纹检测区域703。如图1所示，所述指纹检测区域703位于所述显示屏720的显示区域702之中，因此，使用者在需要对所述终端设备进行解锁或者其他指纹验证的时候，只需要将手指按压在位于所述显示屏720的指纹检测区域703，便可以实现指纹输入。由于指纹检测可以在屏内实现，因此采用上述结构的终端设备700无需其正面专门预留空间来设置指纹按键(比如Home键)。
作为一种优选的实施例中，所述显示屏720可以采用具有自发光显示单元的显示屏，比如有机发光二极管(Organic Light-Emitting Diode，OLED)显示屏或者微型发光二极管(Micro-LED)显示屏。以采用OLED显示屏为例，所述光学指纹装置730可以利用所述OLED显示屏720位于所述指纹检测区域703的显示单元(即OLED光源)来作为光学指纹检测的激励光源。并且，所述光学指纹装置730的感应阵列具体为光探测器(Photo detector)阵列，其包括多个呈阵列式分布的光探测器，所述光探测器可以作为如上所述的光学感应单元。当手指按压在所述指纹检测区域703时，所述指纹检测区域703的显示单元发出的光线在手指表面的指纹发生反射并形成反射光，其中所述手指指纹的脊和谷的反射光是不同的，反射光从所述显示屏720并被所述光探测器阵列所接收并转换为相应的电信号，即指纹检测信号；基于所述指纹检测信号便可以获得指纹图像数据，并且可以进一步进行指纹匹配验证，从而在所述终端设备700实现光学指纹识别功能。
应当理解的是，在具体实现上，所述终端设备700还包括透明保护盖板710，所述盖板710可以为玻璃盖板或者蓝宝石盖板，其位于所述显示屏720的上方并覆盖所述终端设备700的正面。因为，本申请实施例中，所谓的手指按压在所述显示屏720实际上是指按压在所述显示屏720上方的盖板710 或者覆盖所述盖板710的保护层表面。
作为一种可选的实现方式，如图1所示，所述光学指纹装置730包括光检测部分734和光学组件732，所述光检测部分734包括所述感应阵列以及与所述感应阵列电连接的读取电路及其他辅助电路，其可以在通过半导体工艺制作在一个芯片(Die)；所述光学组件732可以设置在所述光检测部分134的感应阵列的上方，其可以具体包括滤光层(Filter)、导光层以及其他光学元件，所述滤光层可以用于滤除穿透手指的环境光，而所述导光层主要用于从手指表面反射回来的反射光导引至所述感应阵列进行光学检测。
在具体实现上，所述光学组件732可以与所述光检测部分134封装在同一个光学指纹芯片。其中，所述导光层可以具体为在半导体硅片制作而成的透镜(Lens)层，其具有多个透镜单元，从手指反射回来的反射光经所述透镜单元，并被其下方的光学感应单元接收，据此，所述感应阵列可以检测出手指的指纹图像。
在所述光学指纹装置730中，每一个透镜单元可以分别对应所述感应阵列的其中一个光学感应单元；可替代地，所述透镜单元跟所述感应阵列的光学感应单元之间也可以采用非一一对应的关系来降低产生莫尔条纹干扰，比如一个光学感应单元可以对应于多个透镜单元，或者，所述透镜单元也可以采用不规则排列的方式；采用不规则排列的透镜单元可以通过后期软件算法来对每一个感应单元检测到的反射光线进行校正。
在其他替代实现方式中，所述显示屏720也可以采用非自发光的显示屏，比如采用背光的液晶显示屏；在这种情况下，所述光学检测装置730便无法采用所述显示屏720的显示单元作为激励光源，因此需要在所述光学检测装置730内部集成激励光源或者在其外部设置激励光源来实现光学指纹检测，其检测原理与上面描述内容是一致的。
应理解，在本申请实施例中，该光学指纹装置中的感应阵列也可以称为图像传感器(Sensor)，或光电传感器，经半导体工艺加工处理可以制作成一个DIE，即DIE包括图像传感器。
还应理解，本申请实施例中的光学指纹装置也可以称为光学指纹识别模组、指纹识别装置、指纹识别模组、指纹模组、指纹采集装置等。
为便于更好的理解本申请实施例，首先介绍一下镜头的性能指标。
视场角(Field Of View，FOV)，表征镜头的视野范围，在镜头尺寸相等 的情况下，镜头的FOV越大，表示该镜头能获得更大区域的信息，即采用该镜头能够获得的信息量更大。
F数，用于表征透过镜头进入光学指纹装置的感应阵列的光线量，F数越小，表示进入镜头的光线量越多。
TV畸变，用于度量图像的视觉畸变程度，可以理解，TV畸变越小，成像效果越好。
相对照度，可以指成像面上的不同坐标点的照度和中心点的照度之比，相对照度越小，成像面的照度越不均匀，容易产生某些位置曝光不足或中心过曝光的问题，影响成像质量，即相对照度越大，成像质量越高。
图2是根据本申请实施例的镜头系统的示意性结构图，如图2所示，该镜头系统10包括：从物方到像方依次设置的第一镜头11、第二镜头12和第三镜头13，其中，所述第一镜头11为负光焦度的镜片，所述第二镜头12为正光焦度的镜片，所述第三镜头13为正光焦度的镜片。
具体地，所述第一镜头为物体侧(即靠近物方的一侧)为凹面的弯月形负光焦度镜片，所述第二镜头为物体侧与像面侧(即靠近像方的一侧)都是凸面的正光焦度镜片，所述第三镜头为物体侧与像面侧都是凸面正光焦度的镜片。
应理解，这里的物体侧为凹面或凸面指的是该镜头的物体侧沿光轴方向的表面的凹凸情况，类似地，像面侧为凸面或凹面指的是该镜头的像面侧沿光轴方向的表面的凹凸情况。
即，该第一镜头11可以为凹透镜，该第二镜头12可以为凸透镜，该第三镜头可以为凸透镜。
应理解，在本申请实施例中，该第一镜头可以为一个凹透镜，或者也可以为一组透镜，只要该一组透镜的组合光焦度为负光焦度即可，同理，该第二镜头也可以为一个凸透镜，或者也可以为一组透镜，只要该一组透镜的组合光焦度为正光焦度即可，类似地，对于该第三镜头亦是如此，这里不做赘述。
可选地，在一些实施例中，所述第一镜头、所述第二镜头和所述第三镜头可以采用树脂材料，或者其他塑料材质，本申请实施例对此不作限定。
进一步地，设置所述镜头系统的参数满足第一关系，以使该镜头系统的FOV大于第一阈值，作为示例而非限定，该镜头系统的参数可以包括以下中 的至少两项：所述第一镜头的焦距、所述第二镜头的焦距、所述第三镜头的焦距、所述第一镜头和所述第二镜头的组合焦距、所述第二镜头和所述第三镜头的组合焦距、所述镜头系统的焦距。
例如，所述镜头系统的参数满足第一关系可以为该第一镜头和第二镜头的焦距的比值在特定的范围内，或该第一镜头和第二镜头的组合焦距与第三镜头的焦距的比值在特定的范围内，或者第一镜头的焦距与该第二镜头和第三镜头的组合焦距的比值在特定的范围内等，本申请实施例对此不作限定。
可选地，在一些实施例中，该第一关系可以为：1.0<f 12/f 3<2.7，其中，f 12为所述第一镜头和所述第二镜头的组合焦距，f 3为所述第三镜头的焦距。
也就是说，本申请实施例可以通过设置第一镜头和第二镜头的组合焦距和该第三镜头的焦距的比值在一定的范围内，从而能够使得该镜头系统具有FOV大的特性，这样，采用该镜头系统的指纹识别模组能够采集更大区域的指纹信息，进而能够提升指纹识别的准确度和安全性。
可选地，在一些实施例中，所述第一阈值为120度。
因此，通过设置镜头系统的参数满足该第一关系，从而使得该镜头系统的FOV大于120度，这样，在镜头尺寸相同的情况下，能够采集更大区域的指纹信息，有利于提升指纹识别的解析力。
可选地，在一些实施例中，该镜头系统的F数小于1.6，能够使得足够多的光线进入到镜头系统，有利于采集微弱的指纹信号，同时还可以缩短曝光时间，降低功耗。
可选地，在一些实施例中，该镜头系统的TV畸变小于5％，有利于规避莫尔条纹对指纹成像的影响。
可选地，在一些实施例中，该镜头系统的相对照度大于30％，有利于提升成像质量。
因此，本申请实施例的镜头系统通过布局不同光焦度的镜头，以及通过设置镜头系统的参数满足第一关系，从而使得镜头系统具有FOV大、工作F数小、TV畸变小和相对照度大的性能，有利于提升采用该镜头系统的指纹识别模组的指纹识别性能。
可选地，在一些实施例中，所述镜头系统的成像面上的最大像高Y'、焦距f和从显示屏的下表面到成像面的距离TTL(即光学总高)满足第二关系，以使所述镜头系统的焦距小于第二阈值。
应理解，TTL的大小决定了该镜头系统的焦距的大小，或者，该镜头系统的尺寸的大小，本申请实施例通过控制该Y'、f和TTL满足第二关系，能够使得该镜头系统在具有较大的FOV的同时，还具有较短的焦距，从而使得该镜头系统能够更好的应用于对尺寸有要求的终端设备上。
可以理解，这里的显示屏可以为该镜头系统所安装的电子设备中的显示屏，该成像面可以理解为图像传感器的表面，该图像传感器可以对应于光学指纹识别模组中的DIE，即进行光信号检测的部分。
可选地，在一些实施例中，所述第二关系可以为：0.4<Y'/(f*TTL)<0.5。
可选地，该第二阈值可以为5毫米，或3毫米等，本申请实施例对此不作限定，只要能够满足终端设备的尺寸要求即可。
可选地，在一些实施例中，所述镜头系统还包括：
光阑，设置于所述第二镜头和所述第三镜头之间。
具体地，光阑可以用于调节光信号或成像范围的大小，通过设置光阑对光信号或成像范围进行调整，可以使得带有指纹信息的光信号最大程度成像于光学指纹识别模组中的图像传感器的表面，使得该图像传感器能够获得更多的指纹信息，进一步可以提升指纹识别的解析力。
综上，本申请实施例的镜头系统是一种广角短焦镜头，广角设计使得该镜头系统能够采集更大区域的指纹信息，短焦设计使得该镜头系统占用更小的空间，从而该镜头系统在实现更优的指纹识别性能的同时，还可以满足终端设备对尺寸的要求，增强了该镜头系统的适用性。
可选地，在一些实施例中，可以通过控制该镜头系统中的各个结构件(例如，第一镜头、第二镜头、光阑和第三镜头)的曲率半径、厚度、材料、有效直径和圆锥系数等物理参数，和/或该镜头系统中的非球面透镜的非球面高次项系数(例如，A2～A16中的偶次项)，以使所述镜头系统的参数满足上述的第一关系和第二关系，进而使得该镜头系统的FOV大于120度，所述镜头系统的TV畸变小于5％，所述镜头系统的相对照度大于30％，所述镜头系统的F数小于1.5，下文结合具体实施例详细描述。
应理解，本申请实施例的镜头系统可以应用于光学指纹识别模组中，该镜头系统可以与该光学指纹识别模组中的图像传感器配合，实现在有限的空间内对较大区域的指纹信息的成像；或者，该镜头系统也可以应用在其他对光学成像性能要求较高的设备或装置中，本申请实施例对此不作限定。
图3是采用本申请实施例的镜头系统的光学指纹识别模组的结构示意图。如图3所示，该光学指纹识别模组200可以包括:红外滤光片(Infrared Filter，IR Filter)201、IR滤光片贴合胶202、芯片(DIE)203、DIE贴合胶204、柔性电路板(Flexible Printed Circuit，FPC)205、补强板206、支架207和镜头系统209。
其中，该IR Filter用于过滤红外光，以避免红外光影响指纹成像；
IR滤光片贴合胶202用于贴合该IR滤光片201和DIE203；
DIE203，对应于图1中的光检测部分734，用于将光信号转换为电信号，可以与镜头系统209配合使用，将经该镜头系统209成像的光信号转换为电信号；
DIE贴合胶204，用于固定DIE203与柔性电路板(Flexible Printed Circuit，FPC)205。
FPC205，用于连接该DIE203和该光学指纹识别模组所安装的电子设备中的电路；
支架207，用于固定该镜头系统209和DIE203，以控制离焦和偏心的精度。
该光学指纹识别模组200的上方还设置有显示屏模组，包括显示屏320、泡棉310和铜箔300。
在本申请实施例中，该镜头系统209可以过盈装配于该支架207中，以使该镜头系统209和DIE203贴合在一起，该光学指纹识别模组的各个结构件可以通过胶粘合在一起，进一步该光学指纹识别模组可以固定在电子设备的中框208中。
由于镜头系统209和显示屏320之间需要进行光信号的传递，因此，该镜头系统209所对应的显示屏模组中的泡棉310和铝箔300需要开孔，以使该镜头系统209的FOV范围内的光信号能够通过。
以下，结合实施例1至实施例3，具体说明根据本申请实施例的镜头系统的性能。
在实施例1至实施例3中，该镜头系统都包括三组透镜和光阑，图4、图9和图14分别示出了实施例1至实施例3的镜头系统的三种布局(layout)，在该三种布局中，从物方到像方依次设置有：显示屏20、第一镜头21、第二镜头22、光阑、第三镜头23、IR滤光片、滤光片贴合胶。
其中，该第一镜头21、第二镜头22和第三镜头23分别对应于上文所述的第一镜头11、第二镜头12和第三镜头13，即该第一镜头21为凹透镜，该第二镜头22为凸透镜，该第三镜头23为凸透镜。
为便于区分和描述，按照从物方到像方的顺序，将显示屏20的上下表面分别记为S1和S2，第一镜头21的两个表面分别记为S3和S4，第二镜头22的两个表面分别记为S5和S6，光阑的表面记为S7，第三镜头23的两个表面分别记为S8和S9，IR滤光片的表面分别记为S10和S11，滤光片贴合胶26的表面记为S12和S13，成像面为S14。
进一步地，通过设置该镜头系统中的每个面的曲率半径、厚度、材料、有效直径、圆锥系数中的至少一项，和/或该镜头系统中的非球面透镜的非球面高次项系数A2、A4、A6、A8、A10、A12、A14、A16，以使该镜头系统的参数满足上述第一关系和第二关系，从而使得该镜头系统的FOV大于120度，TV畸变小于5％，F数小于1.5，以及相对照度大于30％。
以下，以该第一关系为：1.0<f 12/f 3<2.7，该第二关系为：0.4<Y'/(f*TTL)<0.5为例进行说明，但本申请并不限于此。
在实施例1中，可以设置该S1～S14中的每个面的曲率半径、厚度、材料、有效直径、圆锥系数采用表1中对应的参数，S1～S14中的非球面的非球面高次项系数采用表2所示的参数。
表1
表面 表面类型 曲率半径 厚度 材料 有效直径 圆锥系数
S1 物面 无穷 1.5 BK7 4.040  
S2 球面 无穷 1.185   3.034  
S3 非球面 -18.229 0.218 APL5014CL 1.007 302.838
S4 非球面 0.337 0.462   0.489 -1.467
S5 非球面 0.562 0.393 APL5014CL 0.452 -0.599
S6 非球面 -1.698 0.104   0.384 -351.774
S7 光阑面 无穷 0.012   0.310  
S8 非球面 1.063 0.427 APL5014CL 0.342 -2.541
S9 非球面 -0.566 0.352   0.358 -7.073
S10 球面 无穷 0.21 D263TECO 0.475  
S11 球面 无穷 0.020 BK7 0.576  
S14 像面       0.587  
应理解，本申请实施例的表1至表6中参数对应的位置为空白表示无此参数，例如，材料处的空白可以表示空气，未示出S12和S13的参数是因为S11和S12为同一表面，S13和S14为同一表面，故S12和S13的参数未示出。
表2
表面 A2 A4 A6 A8 A10 A12 A14 A16
S3   0.186 -0.115 0.017 0.072 0.018 -0.141 0.084
S4   1.842 2.028 4.720 15.322 -39.819 80.660 806.794
S5   -0.467 -0.953 -17.523 20.146 41.789 612.681 -1558.96
S6   -1.775 14.465 0.202 -781.236 -1275.87 6.396e4 -2.171e5
S8   -0.412 13.089 -10.739 213.890 -4802.74 1.760e4 1.118e4
S9   -1.718 28.238 -27.843 -230.463 -2210.54 7.108e4 -2.641e5
基于表1和表2所示的参数，可以确定实施例1所示的镜头系统的参数如下：TTL＝3.38(即S2到S14的距离)，f 1＝-0.601758，f 2＝0.822380，f 3＝0.743935，f 12＝1.590600，f＝0.367239，f 12/f 3＝2.13809，Y'/(f*TTL)＝0.465995，即镜头系统的参数满足前述的第一关系和第二关系。在上述参数下，图5至图8依次为该镜头系统的相对照度图、像散图、TV畸变图和光学传递函数(Optical Transfer Function)的模值(MTF)图。
从图5至图8所示的仿真图可以得出，该镜头系统的FOV为124度，工作F数为1.223，TV畸变为-2.028％，相对照度为41.0％。因此，在镜头系统的参数满足前述的第一关系和第二关系的情况下，该镜头系统具有FOV大、工作F数小、TV畸变小和相对照度高的性能。
在实施例2中，可以设置该S1～S14中的每个面的曲率半径、厚度、材料、有效直径、圆锥系数采用表3中对应的参数，S1～S14中的非球面的非球面高次项系数采用表4所示的参数。
表3
表面 表面类型 曲率半径 厚度 材料 有效直径 圆锥系数
S1 物面 无穷 1.5 BK7 4.04  
S2 球面 无穷 1.191   3.043  
S3 非球面 -18.230 0.218 APL5015AL 1.029 300.767
S4 非球面 0.341 0.461   0.484 -1.481
S5 非球面 0.341 0.461 OKP-1 0.433 -0.588
S6 非球面 0.569 0.400     -421.586
S7 光阑面 无穷 0.036   0.282  
S8 非球面 1.743 0.370 APL5014CL 0.302 -2.127
S9 非球面 -0.571 0.355   0.364 -4.503
S10 球面 无穷 0.21 D263TECO 0.511  
S11 球面 无穷 0.02 BK7 0.613  
S14 像面       0.624  
表4
表面 A2 A4 A6 A8 A10 A12 A14 A16
S3   0.185 -0.116 0.015 0.072 0.019 -0.140 0.085
S4   1.736 2.063 5.227 19.324 -13.532 226.239 1463.033
S5   -0.458 -0.913 -17.906 12.240 -22.420 301.434 -2517.25
S6   -1.995 11.807 -13.286 -820.210 -1255.51 6.513e4 -2.086e5
S8   -0.660 -13.691 -101.157 1098.053 1.631e4 -727.929 -1.150e6
S9   -2.785 34.032 -77.283 -294.196 -1411.69 4248.241 1.322e5
基于表3和表4所示的参数，可以确定实施例1所示的镜头系统的参数如下：TTL＝3.36613(即S2到S14的距离)，f 1＝-0.608717，f 2＝0.727880，f 3＝0.832835，f 12＝1.105138，f＝0.39179，f 12/f 3＝1.327，Y'/(f*TTL)＝0.451，即镜头系统的参数满足前述的第一关系和第二关系。在上述参数下，图10至图13依次为该镜头系统的相对照度图、像散图、TV畸变图和MTF图。
从图10至图13所示的仿真图可以得出，该镜头系统的FOV为123度，工作F数为1.247，TV畸变为-2.102％，相对照度为34.6％。因此，在镜头系统的参数满足前述的第一关系和第二关系的情况下，该镜头系统具有FOV大、工作F数小、TV畸变小和相对照度高的性能。
在实施例3中，可以设置该S1～S14中的每个面的曲率半径、厚度、材料、有效直径、圆锥系数采用表5中对应的参数，S1～S14中的非球面的非球面高次项系数采用表6所示的参数。
表5
表面 表面类型 曲率半径 厚度 材料 有效直径 圆锥系数
S1 物面 无穷 1.5 BK7 4.00  
S2 球面 无穷 1.3   3.019  
S3 非球面 -19.863 0.210 APL5014CL 0.971 404.468
S4 非球面 0.327 0.408   0.507 -1.663
S5 非球面 0.571 0.361 APL5014CL 0.465 -0.639
S6 非球面 -1.531 0.097   0.370 -274.759
S7 光阑面 无穷 0.023   0.305  
S8 非球面 1.056 0.462 APL5014CL 0.355 2.010
S9 非球面 -0.529 0.356   0.347 -6.033
S10 球面 无穷 0.21 D263TECO 0.426  
S11 球面 无穷 0.02 BK7 0.528  
S14 像面       0.540  
表6
表面 A2 A4 A6 A8 A10 A12 A14 A16
S3   0.174 -0.096 0.013 0.049 3.276e-3 -0.140 0.110
S4   2.128 1.912 0.685 -2.957 -26.139 143.791 -678.914
S5   -0.783 0.812 -9.438 48.170 75.200 143.152 -385.979
S6   -1.196 14.044 23.499 -928.722 -350.306 6.612e4 -1.853e5
S8   0.073 9.744 -23.095 57.055 -323.067 600.961 2.541e4
S9   -2.117 24.670 35.827 -108.577 -991.275 932.978 1.799e5
基于表5和表6所示的参数，可以确定实施例3所示的镜头系统的参数如下：TTL＝3.44816(即S2到S14的距离)，f 1＝-0.584991，f 2＝0.808783，f 3＝0.717745，f 12＝1.861261，f＝0.373529，f 12/f 3＝2.593，Y'/(f*TTL)＝0.444，即镜头系统的参数满足前述的第一关系和第二关系。在上述参数下，图15至图18依次为该镜头系统的相对照度图、像散图、TV畸变图和MTF图。
从图15至图18所示的仿真图可以得出，该镜头系统的FOV为120度，工作F数为1.240，TV畸变为1.755％，相对照度为45.8％。因此，在镜头系统的参数满足前述的第一关系和第二关系的情况下，该镜头系统具有FOV 大、工作F数小、TV畸变小和相对照度高的性能。
综上，本申请实施例的镜头系统提供了一种广角短焦镜头，采用该镜头系统能够采集更大区域的指纹信息，并且短焦设计使得该镜头系统能够更好的应用于对尺寸有要求的终端设备上，增强了该镜头系统的适用性。
图19是根据本申请实施例的指纹识别装置的示意性框图，如图19所示，该指纹识别装置400可以包括镜头系统401，该镜头系统401可以为前述实施例中的镜头系统10。
可选地，该指纹识别装置可以包括图像传感器402，设置在该镜头系统401的下方，用于接收经该镜头系统处理后的光信号，并对该光信号进行处理，以获取该光信号中包括的指纹信息。
可选地，该指纹识别装置400对应于图3所示的光学指纹识别模组200，该指纹识别装置400还可以包括该光学指纹识别模组200中的结构，例如，IR滤光片201、支架207等，这里不作赘述。
本申请实施例还提供了一种终端设备，如图20所示，该终端设备500包括指纹识别装置510，该指纹识别装置510可以为前述实施例中的指纹识别装置400，或图3所示实施例中的光学指纹识别模组200。
可选地，该终端设备还可以包括屏幕组件520，包括显示屏、泡棉和铜箔，设置于所述指纹识别装置510中的镜头系统的上方；
其中，所述镜头系统上方对应的所述泡棉和所述铜箔的区域开孔，以使包括指纹信息的光信号进入所述镜头系统。
作为示例而非限定，所述终端设备500可以为手机、平板电脑、笔记本电脑、台式机电脑、车载电子设备或穿戴式智能设备等，该穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等设备。
应理解，本申请实施例中的具体的例子只是为了帮助本领域技术人员更好地理解本申请实施例，而非限制本申请实施例的范围，本领域技术人员可以在上述实施例的基础上进行各种改进和变形，而这些改进或者变形均落在本申请的保护范围内。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易 想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (13)

  1. 一种镜头系统，其特征在于，包括：从物方到像方依次设置的第一镜头、第二镜头和第三镜头，其中，所述第一镜头为物体侧为凹面的弯月形负光焦度镜片，所述第二镜头为物体侧与像面侧都是凸面的正光焦度镜片，所述第三镜头为物体侧与像面侧都是凸面正光焦度的镜片；
    并且，所述镜头系统的参数满足第一关系，以使所述镜头系统的视场角FOV大于第一阈值，其中，所述镜头系统的参数包括以下中的至少两项：所述第一镜头的焦距、所述第二镜头的焦距、所述第三镜头的焦距、所述第一镜头和所述第二镜头的组合焦距、所述第二镜头和所述第三镜头的组合焦距、所述镜头系统的焦距。
  2. 根据权利要求1所述的镜头系统，其特征在于，所述第一关系为：1.0<f 12/f 3<2.7，其中，f 12为所述第一镜头和所述第二镜头的组合焦距，f 3为所述第三镜头的焦距。
  3. 根据权利要求1或2所述的镜头系统，其特征在于，所述第一阈值为120度。
  4. 根据权利要求1至3中任一项所述的镜头系统，其特征在于，所述镜头系统的成像面上的最大像高Y'、焦距f和从显示屏的下表面到成像面的距离TTL满足第二关系，以使所述镜头系统的焦距小于第二阈值。
  5. 根据权利要求4所述的镜头系统，其特征在于，所述第二关系为：0.4<Y'/(f*TTL)<0.5。
  6. 根据权利要求1至5中任一项所述的镜头系统，其特征在于，所述镜头系统还包括：
    光阑，设置于所述第二镜头和所述第三镜头之间。
  7. 根据权利要求1至6中任一项所述的镜头系统，其特征在于，所述镜头系统中的至少一个面为非球面。
  8. 根据权利要求1至7中任一项所述的镜头系统，其特征在于，所述镜头系统的TV畸变小于5％，所述镜头系统的相对照度大于30％，所述镜头系统的F数小于1.5。
  9. 一种指纹识别装置，其特征在于，包括：
    如权利要求1至8中任一项所述的镜头系统。
  10. 根据权利要求9所述的指纹识别装置，其特征在于，所述指纹识别 装置还包括：
    图像传感器，设置于所述镜头系统的下方，用于接收经所述镜头系统传输后的光信号，并对所述光信号进行处理，以获取所述光信号中包括的指纹信息。
  11. 根据权利要求9或10所述的指纹识别装置，其特征在于，还包括：支架；
    其中，所述镜头系统过盈装配于所述支架中。
  12. 一种终端设备，其特征在于，包括：如权利要求9至11中任一项所述的指纹识别装置。
  13. 根据权利要求12所述的终端设备，其特征在于，所述终端设备还包括：
    屏幕组件，包括显示屏、泡棉和铜箔，设置于所述指纹识别装置中的镜头系统的上方；
    其中，所述镜头系统上方对应的所述泡棉和所述铜箔的区域开孔，以使包括指纹信息的光信号进入所述镜头系统。
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