CN109564338B - Lens group, fingerprint identification device and electronic equipment - Google Patents

Lens group, fingerprint identification device and electronic equipment Download PDF

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Publication number
CN109564338B
CN109564338B CN201880002082.XA CN201880002082A CN109564338B CN 109564338 B CN109564338 B CN 109564338B CN 201880002082 A CN201880002082 A CN 201880002082A CN 109564338 B CN109564338 B CN 109564338B
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lens
lens group
fingerprint
optical
group
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CN109564338A (en
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葛丛
李林欣
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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    • 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
    • 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

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Lenses (AREA)
  • Image Input (AREA)

Abstract

The embodiment of the application provides a lens group, a fingerprint identification device and an electronic device, which comprise a first lens and a second lens which are sequentially arranged from an object side to an image side, wherein the first lens comprises a first lens with negative focal power, the first lens is an S-shaped meniscus lens with a convex object side, and at least one of two surfaces of the first lens is an aspheric surface; the second lens comprises a second lens with positive focal power, the second lens is a biconvex lens, and at least one of two surfaces of the second lens is an aspheric surface; wherein the parameters of the lens groups satisfy a first relationship such that the field angle FOV of the lens groups is greater than a first threshold.

Description

Lens group, fingerprint identification device and electronic equipment
Technical Field
The embodiments of the present application relate to the field of optical imaging, and more particularly, to a lens group, a fingerprint recognition device, and an electronic apparatus.
Background
With the rapid development of the mobile phone industry, the fingerprint identification technology is more and more emphasized by people, and the practicability of the under-screen fingerprint identification technology becomes a requirement of the public. The technology for identifying the fingerprints under the optical screen is characterized in that an optical fingerprint sensor collects reflected light formed by reflecting light rays emitted by a light source on a finger, and the reflected light carries fingerprint information of the finger, so that the identification of the fingerprints under the screen is realized. The fingerprint identification device can guide the optical signal returned by the finger through the lens system, and the reflected light reaches the optical fingerprint sensor after passing through the lens system. In order to obtain more fingerprint information, the field of view of the lens system needs to be enlarged as much as possible to acquire a larger area of fingerprint image, but this results in a longer lens system, which occupies a small longitudinal space of the electronic device to some extent. Therefore, how to obtain a proper field size without increasing the length of the lens system becomes an urgent problem to be solved.
Disclosure of Invention
The embodiment of the application provides a lens group, fingerprint identification device and electronic equipment, can obtain suitable visual field size under the condition that does not increase lens system length to realize the collection of the fingerprint information in the great fingerprint collection region.
In a first aspect, there is provided a lens group comprising: the camera comprises a first lens and a second lens which are sequentially arranged from an object space to an image space. The first lens comprises a first lens with negative focal power, the first lens is an S-shaped meniscus lens with a convex object side, and at least one of two surfaces of the first lens is an aspheric surface; the second lens comprises a second lens with positive focal power, the second lens is a biconvex lens, and at least one of two surfaces of the second lens is an aspheric surface;
wherein the parameters of the lens group satisfy a first relationship such that the field angle FOV of the lens group is greater than a first threshold value and the length of the lens group is less than a second threshold value.
Wherein the parameters of the lens group include at least two of: a focal length f of the lens group, a focal length f of the first lens element1Focal length f of the second lens2A radius of curvature R1 of an object-side surface of the first lens, a radius of curvature R2 of an image-side surface of the first lens, a radius of curvature R3 of an object-side surface of the second lens, and a radius of curvature R4 of an image-side surface of the second lens.
Therefore, the lens group of the embodiment of the application has a larger FOV by arranging the lenses with different focal powers, each lens comprises at least one aspheric surface, and the parameters of the lens group meet the first relation, so that the lens group has a larger FOV, the collection of fingerprint information in a larger fingerprint collection area is realized, and the fingerprint identification performance of the optical fingerprint identification device adopting the lens group is improved.
In one possible implementation, the first relationship includes: 2.5<f1/R1<4 and 0.5<f1/R2<2.0。
In one possible implementation manner, the first relationship further includes: 2.5<f1/R1<4 and 0.5<f1/R2<2.0。
In one possible implementation manner, the first relationship further includes: -1<f/f1<0、0<f/f2<1、-8<f1/f2<-4。
In one possible implementation manner, the first relationship further includes: 0.2< R1/R2<0.5, -1< R1/R3< -0.4, -2 < R1/R4<4, -3< R2/R3< -1, -5 < R2/R4<12, -8< R3/R4< -3.
In one possible implementation, the first threshold is 100 degrees.
In one possible implementation, the second threshold is 2.6 millimeters.
In one possible implementation, the thickness CT1 of the first lens along the optical axis and the thickness CT2 of the second lens along the optical axis satisfy: 0.5< CT1/CT2< 1.5.
In one possible implementation manner, a distance TTL from the lower surface of the display screen to the imaging surface and a focal length f of the lens group satisfy: 0.1< f/TTL < 0.2.
In one possible implementation manner, the maximum image height Y' on the imaging surface of the lens group, the distance TTL from the lower surface of the display screen to the imaging surface, and the focal length f of the lens group satisfy: 0.45< Y'/(f TTL) < 0.6.
In a possible implementation, the refractive index n of the material of the first lens is1> 1.54, the Abbe number v of the material of the first lens1＞55.50。
In one possible implementationRefractive index n of the material of the second lens2> 1.54, the Abbe number v of the material of the second lens2＞55.98。
In one possible implementation, the lens group further includes: and the diaphragm is arranged between the first lens and the second lens.
In one possible implementation, the TV distortion of the lens group is less than 5%, the relative illuminance of the lens group is greater than 30%, and the F-number of the lens group is less than 1.6.
In a second aspect, there is provided a fingerprint identification device comprising a lens system including one lens group as in the first aspect or any one of the possible implementations of the first aspect, or including two of the lens groups arranged side by side in a radial direction.
In a possible implementation manner, the fingerprint identification apparatus further includes an optical fingerprint sensor, which is disposed below the lens system and is configured to receive the optical signal transmitted by the lens system and process the optical signal to obtain fingerprint information carried in the optical signal.
In one possible implementation, the fingerprint identification device further comprises a bracket, wherein the lens system is interference-fitted in the bracket.
In a third aspect, an electronic device is provided, which includes the fingerprint identification apparatus as in the second aspect or any possible implementation manner of the second aspect.
In a possible implementation manner, the electronic device further includes a screen assembly, where the screen assembly includes a display screen, foam, and a copper foil, and is disposed above the lens system in the fingerprint identification device. And the area of the foam and the copper foil above the lens system is opened so as to enable an optical signal containing fingerprint information to enter the lens system.
Drawings
Fig. 1 is a schematic plan view of an electronic device to which the present application may be applied.
Fig. 2 is a schematic partial cross-sectional view of the electronic device shown in fig. 1 along a-a'.
Fig. 3 is a schematic structural diagram of a lens group according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of an optical fingerprint identification module according to an embodiment of the present application.
Fig. 5 is a schematic diagram of a layout of lens groups according to an embodiment of the present application.
Fig. 6 is a diagram of relative illuminance of lens groups of the layout shown in fig. 5.
Fig. 7(a) and 7(b) are an astigmatism diagram and a distortion diagram, respectively, of the lens group of the layout shown in fig. 5.
Fig. 8 is an MTF graph of the lens groups of the layout shown in fig. 5.
Fig. 9 is a schematic view of another layout of lens groups according to an embodiment of the present application.
Fig. 10 is a diagram of relative illuminance of lens groups of the layout shown in fig. 9.
Fig. 11(a) and 11(b) are an astigmatism diagram and a distortion diagram, respectively, of the lens group of the layout shown in fig. 9.
Fig. 12 is an MTF graph of the lens groups of the layout shown in fig. 9.
Fig. 13 is a schematic view of another layout of lens groups according to an embodiment of the present application.
Fig. 14 is a diagram of relative illuminance of lens groups of the layout shown in fig. 13.
Fig. 15(a) and 15(b) are an astigmatism diagram and a distortion diagram, respectively, of the lens group of the layout shown in fig. 13.
Fig. 16 is an MTF graph of the lens groups of the layout shown in fig. 13.
Fig. 17 is a schematic structural diagram of a fingerprint recognition device according to an embodiment of the present application.
Fig. 18 is a schematic position diagram of two lens groups included in the fingerprint recognition device.
FIG. 19 is a schematic block diagram of an electronic device according to an embodiment of the present application.
Fig. 20 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
As electronic devices step into the full-screen era, the fingerprint collecting area on the front side of the electronic devices is squeezed by the full-screen, and therefore, Under-screen (or Under-screen) fingerprint identification technology is receiving more and more attention. The technology of fingerprint identification under the screen is that a fingerprint identification device such as an optical fingerprint identification device is installed below the display screen, so that fingerprint identification operation is performed in the display area of the display screen, and a fingerprint acquisition area does not need to be arranged in the area of the front face of the electronic equipment except the display area.
Optical underscreen fingerprint identification technology uses light returned from the top surface of the device display screen for fingerprint sensing and other sensing operations. The returning light carries information about an object (e.g., a finger) in contact with the top surface, and by collecting and detecting the returning light, a specific optical fingerprint sensor located below the display screen is implemented. The design of the optical fingerprint sensor may be such that the desired optical imaging is achieved by appropriately configuring the optical elements used to collect and detect the returned light.
It should be understood that the technical solutions of the embodiments of the present application may be applied to various electronic devices, such as portable or mobile computing devices, such as smart phones, notebook computers, tablet computers, and game devices, and other electronic devices, such as electronic databases, automobiles, and Automated Teller Machines (ATMs), but the embodiments of the present application are not limited thereto.
Fig. 1 and fig. 2 are schematic diagrams illustrating an electronic device 100 to which the fingerprint identification device according to the embodiment of the present application may be applied, where fig. 1 is a schematic diagram illustrating a front side of the electronic device 100, and fig. 2 is a schematic diagram illustrating a partial cross-sectional structure of the electronic device 100 shown in fig. 1 along a-a'.
As shown in fig. 1 and 2, the electronic device 100 includes a display 120 and an optical fingerprint identification device (hereinafter, also referred to as fingerprint identification device) 130, wherein the optical fingerprint identification device 130 has one or more sensing arrays disposed at least in a partial region below the display 120, so that a fingerprint collection region (or sensing region) 103 of the optical fingerprint identification device 130 is at least partially located in a display region 102 of the display 120.
It should be understood that the area of the fingerprint collection area 103 may be different from the area of the sensing array of the optical fingerprint identification device 130, for example, by the design of optical path such as lens imaging, reflective folded optical path design or other optical path design such as light convergence or reflection, the area of the fingerprint collection area 103 of the optical fingerprint identification device 130 may be larger than the area of the sensing array of the optical fingerprint identification device 130. In other alternative implementations, the fingerprint capture area 103 of the optical fingerprint recognition device 130 may be designed to correspond to the area of the sensing array of the optical fingerprint recognition device 130 if optical path guidance is performed, for example, by light collimation.
As shown in fig. 1, the fingerprint collection area 103 is located in the display area 102 of the display screen 120, so that when a user needs to unlock or otherwise verify a fingerprint of the electronic device, the user only needs to press a finger on the fingerprint collection area 103 of the display screen 120, so as to realize fingerprint input. Since fingerprint detection can be implemented in the screen, the electronic device 100 adopting the above structure does not need to reserve a special space on the front surface thereof to set a fingerprint key (such as a Home key), so that a full-screen scheme can be adopted, that is, the display area 102 of the display screen 120 can be substantially extended to the front surface of the whole electronic device 100.
In one embodiment, the display screen 120 may be a self-luminous display screen that uses self-luminous display units as display pixels, such as an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. Taking an OLED display screen as an example, the optical fingerprint identification device 130 may use an OLED display unit (i.e., an OLED light source) of the OLED display screen 120 located in the fingerprint identification area 103 as an excitation light source for optical fingerprint detection.
In other embodiments, the optical fingerprint identification device 130 may also use an internal light source or an external light source to provide an optical signal for fingerprint detection. In this case, the optical fingerprint recognition device 130 may be adapted to a non-self-luminous display screen, such as a liquid crystal display screen or other passive luminous display screen. Taking an application to a liquid crystal display having a backlight module and a liquid crystal panel as an example, to support the underscreen fingerprint detection of the liquid crystal display, the optical fingerprint system of the electronic device 100 may further include an excitation light source for optical fingerprint detection, where the excitation light source may specifically be an infrared light source or a light source of non-visible light with a specific wavelength, and may be disposed below the backlight module of the liquid crystal display or in an edge area below a protective cover of the electronic device 100, and the optical fingerprint identification device 130 may be disposed below the edge area of the liquid crystal panel or the protective cover and guided through a light path so that the fingerprint detection light may reach the optical fingerprint identification device 130; alternatively, the optical fingerprint recognition device 130 may be disposed below the backlight module, and the backlight module may be perforated or otherwise optically designed to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint recognition device 130.
Moreover, the sensing array of the optical fingerprint identification apparatus 130 is specifically a Photo detector (Photo detector) array, which includes a plurality of Photo detectors distributed in an array, and the Photo detectors may be used as the optical sensing units as described above. When a finger touches, presses or approaches (for convenience of description, this application refers to as touching) the fingerprint identification area 103, light emitted by the display unit of the fingerprint identification area 103 reflects on the fingerprint on the surface of the finger and forms reflected light, wherein the reflected light of the ridges and the valleys of the fingerprint of the finger is different, and the reflected light is received from the display screen 120 and is converted into a corresponding electrical signal, i.e., a fingerprint detection signal. Fingerprint image data can be obtained based on the fingerprint detection signal, and fingerprint matching verification can be further performed, so that an optical fingerprint identification function is realized in the electronic device 100.
It should be understood that in a specific implementation, the electronic device 100 further includes a transparent protective cover plate 110, and the cover plate 110 may be a transparent cover plate, such as a glass cover plate or a sapphire cover plate, which is located above the display screen 120 and covers the front surface of the electronic device 100. Therefore, in the embodiment of the present application, the fact that the user touches, presses or approaches the display screen 120 means that the user actually touches, presses or approaches the cover plate 110 above the display screen 120 or a protective layer surface covering the cover plate 110. In addition, the electronic device 100 may further include a touch sensor, which may be specifically a touch panel, and may be disposed on the surface of the display screen 120, or may be partially or wholly integrated into the display screen 120, that is, the display screen 120 is specifically a touch display screen.
As an alternative implementation, as shown in fig. 2, the optical fingerprint identification apparatus 130 includes an optical detection unit 134 and an optical component 132, where the optical detection unit 134 includes the sensing array and a reading circuit and other auxiliary circuits electrically connected to the sensing array, which can be fabricated on a chip (Die) by a semiconductor process; that is, the optical detection unit 134 may be fabricated on an optical imaging chip or an image sensing chip (hereinafter also referred to as an optical fingerprint sensor or an optical fingerprint sensor chip). The optical component 132 may be disposed above the sensing array of the optical detection unit 134, and may specifically include an optical Filter (or called Filter, Filter), an optical path guiding structure, and other optical elements, where the optical Filter may be used to Filter the ambient light penetrating through the finger, and the optical path guiding structure is mainly used to perform optical path guiding such as collimating, modulating, or converging on the downward-propagating light to guide the reflected light reflected from the surface of the finger to the sensing array for optical detection.
In a specific implementation, the optical component 132 and the optical detection unit 134 may be packaged in the same optical fingerprint chip, or the optical component 132 may be disposed outside the chip on which the optical detection unit 134 is located, for example, the optical component 132 is attached above the chip, or some components of the optical component 132 are integrated in the chip. The optical path guiding structure of the optical component 132 has various implementation schemes, for example, the optical path guiding structure may be an optical path modulator or an optical path collimator fabricated on a semiconductor silicon wafer or other substrate, and the optical path guiding structure has a plurality of optical path modulating units or collimating units, and the optical path modulating units or collimating units may be a micro-pore array. Alternatively, the light guide layer may be an optical Lens (Lens) layer having one or more Lens units, such as a Lens group (hereinafter also referred to as a Lens group) composed of one or more aspheric lenses. The reflected light reflected from the finger is collimated or converged by the micropore array or the lens unit and received by the optical sensing unit below the micropore array or the lens unit, so that the sensing array can detect the fingerprint image of the finger.
A Circuit board 140, such as a Flexible Printed Circuit (FPC), may be disposed below the optical fingerprint identification device 130, and the optical fingerprint identification device 130 may be soldered to the Circuit board 140 through a solder pad, for example, and may be electrically interconnected with other peripheral circuits or other components of the electronic device 100 and transmit signals through the Circuit board 140. For example, the optical fingerprint identification device 130 may receive a control signal of a processing unit of the electronic apparatus 100 through the circuit board 140, and may also output the fingerprint detection signal to the processing unit or the control unit of the electronic apparatus 100 through the circuit board 140.
The embodiment of the application adopts the lens group to collect the optical signal reflected by the finger above the display screen, and guides the optical signal to the optical fingerprint sensor below the lens group, and the optical signal carries the fingerprint information of the finger, thereby realizing optical fingerprint identification.
For better understanding, first, the parameter index designed in the embodiment of the present application to be used for evaluating the performance of the lens group will be briefly described.
Field angle (Field Of View, FOV): the field of view range used for representing the lens is that, in the case of equal lens size, the greater the FOV of the lens is, the larger the information that the lens can obtain the larger area is, that is, the larger the amount of information that can be obtained by using the lens is.
Aperture or F-number (Fno): the reciprocal of the relative aperture of the lens is used for representing the light quantity which enters the sensing array of the optical fingerprint device through the lens. The smaller the F number, the more the amount of light entering the lens.
Distortion of TV: for measuring the degree of visual distortion of the image. It can be appreciated that the smaller the TV distortion, the better the imaging.
Relative Illuminance (RI): the ratio of the illumination of different coordinate points on an imaging surface to the illumination of a central point is indicated, the smaller the relative illumination is, the more uneven the illumination of the imaging surface is, and the problem of underexposure or central overexposure of certain positions is easily caused, so that the imaging quality is influenced; the greater the relative illuminance, the higher the imaging quality.
Fig. 3 is a schematic structural view of a lens group according to an embodiment of the present application, and as shown in fig. 3, the lens group 30 includes: a first lens 31 and a second lens 32 arranged in order from the object side to the image side.
The first lens 31 includes a negative-power first lens, which is an S-shaped meniscus lens with a convex object side, and at least one of two surfaces of the first lens is aspheric; the second lens 32 includes a second lens with positive refractive power, the second lens is a biconvex lens, and at least one of two surfaces of the second lens is an aspheric surface.
It should be understood that, in the embodiment of the present application, the first lens may be a single lens, i.e., a first lens, or may also be a group of lenses as long as the combined focal power of the group of lenses is a negative focal power; similarly, the second lens may also be a single lens, i.e. a second lens, or may also be a group of lenses, as long as the combined focal power of the group of lenses is a positive focal power. The first lens is taken as a first lens, and the second lens is taken as a second lens. The first lens and the second lens may be made of resin material or other plastic material, for example, but not limited thereto.
Further, the parameters of the lens group satisfy a first relationship such that the FOV of the field of view of the lens group is larger than a first threshold, anThe length of the lens group is smaller than the second threshold value. Wherein, the parameters of the lens group include at least two of the following: focal length f of the lens assembly and focal length f of the first lens element1Focal length f of the second lens2A radius of curvature R1 of the object-side surface of the first lens element, a radius of curvature R2 of the image-side surface of the first lens element, a radius of curvature R3 of the object-side surface of the second lens element, and a radius of curvature R4 of the image-side surface of the second lens element.
In this embodiment, the lens group has a larger FOV by arranging the lenses with different focal powers, each lens including at least one aspheric surface, and setting the parameters of the lens group to satisfy the first relationship under the condition that the length of the lens group is constant, so as to realize the acquisition of fingerprint information in a larger fingerprint acquisition area, and improve the fingerprint identification performance of the optical fingerprint identification device adopting the lens group. Or, in case of obtaining the same size FOV, the length of the lens group is reduced, thereby reducing the longitudinal space occupied by the lens group when it is assembled in the electronic device.
The first relationship satisfied by the parameters of the lens group may include at least one of the following parameter relationships: f. of1Relationships with R1 and R2, respectively, e.g. f1In a predetermined range of values,/R21the/R2 is within a preset numerical range; f. of2Relationships with R3 and R4, respectively, e.g. f2In a predetermined range of values,/R32the/R4 is within a preset numerical range; f. f. of1And f2In relation to each other, e.g. f/f1Within a predetermined range of values, f/f2Within a predetermined range of values, f1/f2Within a preset numerical range; the relationships among R1, R2, R3 and R4, for example, R1/R2 are within a preset numerical range, R1/R3 are within a preset numerical range, R1/R4 are within a preset numerical range, R2/R3 are within a preset numerical range, R2/R4 are within a preset numerical range, R3/R4 are within a preset numerical range, and the like.
By simulating the lens group and combining empirical values, the first relationship between the above parameters can be obtained, with the object that the FOV of the lens group is larger than a first threshold, which may be, for example, 100 degrees, and the length of the lens group is smaller than a second threshold, which may be, for example, 2.6 mm.
For example, the first relationship includes: 2.5<f1/R1<4 and/or 0.5<f1/R2<2.0。
For another example, the first relationship includes: 0.2<f2/R3<0.5 and/or-2<f2/R4<-1。
For another example, the first relationship includes at least one of: -1<f/f1<0、0<f/f2<1、-8<f1/f2<-4。
For another example, the first relationship includes at least one of: 0.2< R1/R2<0.5, -1< R1/R3< -0.4, -2 < R1/R4<4, -3< R2/R3< -1, -5 < R2/R4<12, -8< R3/R4< -3.
It should be understood that the lens group can satisfy all of the above parameter relationships, and can also satisfy some of the parameter relationships, only by ensuring that the FOV is greater than the first threshold. For example, when 2.5 is satisfied<f1/R1<4 and 0.5<f1/R2<2.0, the lens group can achieve the requirement that the FOV is larger than 100 degrees, and effectively reduce the length (distance from the lower surface of the screen to the image surface) of the lens group, for example, the length of the lens group is smaller than 2.6mm, thereby reducing the longitudinal space occupied by the lens group when the lens group is assembled in the electronic device; further, when 0.2 is satisfied<f2/R3<0.5 and/or-2<f2/R4<At-1, the aberration of the lens group can be effectively controlled, and the imaging quality of the lens group can be effectively improved; further, when-1 is satisfied<f/f1<0、0<f/f2<1、-8<f1/f2<4, the depth of field of the lens group can be reduced, thereby improving the imaging quality for a specific surface, for example, the imaging quality for the upper surface of the screen; further, when 0.2 is satisfied<R1/R2<0.5、-1<R1/R3<-0.4、2<R1/R4<4、-3<R2/R3<-1、5<R2/R4<12、-8<R3/R4<3, the sensitivity of the lens group, i.e., the degree of influence of the manufacturing error on the imaging effect, can be reduced,thereby improving the yield of the lens group in the manufacturing process.
Based on the above, by setting the parameters in the lens group, the lens group has the performances of large FOV, small working F number, small TV distortion and large relative illumination, which is beneficial to improving the fingerprint identification performance of the fingerprint identification module adopting the lens group.
Optionally, in some embodiments, the thickness CT1 of the first lens element along the optical axis direction and the thickness CT2 of the second lens element along the optical axis direction also satisfy a predetermined relationship, for example, 0.5< CT1/CT2<1.5, thereby the structure of the lens assembly is more robust, thereby improving the service life of the lens assembly.
Optionally, in some embodiments, a distance (TTL) from the lower surface of the display screen to the imaging surface and the focal length f of the lens group satisfy a preset relationship, for example, satisfy 0.1< f/TTL < 0.2. When the imaging requirement of the lens group is satisfied, the miniaturization of the lens group is maintained, and the degree of freedom of the lens group in the electronic equipment is improved.
Optionally, in some embodiments, the maximum image height Y 'on the imaging surface of the lens group, the distance TTL from the lower surface of the display screen to the imaging surface, and the focal length f of the lens group also satisfy a preset relationship, for example, satisfy 0.45< Y'/(f × TTL) < 0.6. Because the size of TTL has decided the size of the focus f of this lens assembly, perhaps the size of this lens assembly, consequently satisfies between Y', f and the TTL three and predetermines the relation through controlling, can make this lens assembly have short focal length and great FOV simultaneously, furthest utilizes the effective photosensitive area of optics fingerprint sensor, the area of response array promptly to promote imaging resolution.
Optionally, in some embodiments, the refractive index and the abbe number of the material of the first lens also satisfy a predetermined relationship, such as the direct power n of the material of the first lens1> 1.54, the Abbe number v of the material of the first lens1Is greater than 55.50. Such a configuration may provide a suitable phase difference balance in view of satisfying dispersion requirements and reducing production costs.
OptionallyIn some embodiments, the refractive index and the Abbe number of the material of the second lens also satisfy a predetermined relationship, e.g., the refractive index n of the material of the second lens2> 1.54, the Abbe number v of the material of the second lens2Is greater than 55.98. Such a configuration may provide a suitable phase difference balance in view of satisfying dispersion requirements and reducing production costs.
In the embodiment of the present application, when the parameters of the lens group satisfy the first relationship, in addition to making the FOV greater than the first threshold, the parameters of the lens group, such as F number, TV distortion, relative illumination, etc., can be made to be in a suitable range. For example, the F number of the lens group is less than 1.5, so that enough light can enter the lens group, weak fingerprint signals can be collected, the exposure time can be shortened, and the power consumption can be reduced. For another example, the TV distortion of the lens group is less than 5%, which is beneficial to avoiding the influence of moire fringes on fingerprint imaging. For another example, the relative illumination of the lens group is greater than 30%, which is beneficial to improving the imaging quality.
Optionally, in some embodiments, the lens group further includes a diaphragm (or may also be referred to as an aperture stop) disposed between the first lens and the second lens.
This diaphragm can be used for adjusting the size of light signal or formation of image scope, adjusts light signal or formation of image scope through setting up the diaphragm, makes the light signal who carries fingerprint information can image on optics fingerprint sensor to the at utmost for this optics fingerprint sensor can obtain more fingerprint information, further promotes fingerprint identification's analytic power.
Alternatively, in some embodiments, the parameters of the lens group can satisfy the first relationship by controlling physical parameters such as curvature radius, thickness, material, effective diameter and cone coefficient of each structural member (e.g. the first lens, the second lens, the diaphragm) in the lens group, and/or aspheric high-order term coefficients (e.g. even-order terms in a 2-a 16) of the aspheric lens in the lens group, so that the FOV of the lens group is greater than 100 degrees, the TV distortion of the lens group is less than 5%, the relative illumination of the lens group is greater than 30%, and the F-number of the lens group is less than 1.5, which will be described in detail below with reference to specific embodiments.
It should be understood that the lens group of the embodiment of the present application can be applied to an optical fingerprint identification device, and the lens group can cooperate with an optical fingerprint sensor in the optical fingerprint identification device to realize imaging of fingerprint information of a large fingerprint collection area in a limited space; alternatively, the lens group can be applied to other devices or apparatuses with high requirements on optical imaging performance, and is not limited herein.
Fig. 4 is a schematic structural diagram of an optical fingerprint identification device using the lens group according to the embodiment of the present application. As shown in fig. 4, the optical fingerprint recognition apparatus 400 may include: an Infrared Filter (IR Filter)401, an IR Filter bonding adhesive 402, a chip (DIE)403, a DIE bonding adhesive 404, a Flexible Printed Circuit (FPC) 405, a reinforcing plate 406, a bracket 407, and a lens group 409.
The IR Filter is used for filtering infrared light so as to avoid the influence of the infrared light on fingerprint imaging;
the IR filter bonding adhesive 402 is used for bonding the IR filter 401 and the DIE 403;
a DIE403, which may be an optical imaging chip or the like, which may specifically correspond to the light detecting portion 134 in fig. 1, for converting an optical signal into an electrical signal to acquire a fingerprint image of a finger above the optical fingerprint recognition device; the DIE403 can cooperate with the lens group 409 to convert the optical signal imaged by the lens group 409 into an electrical signal;
the DIE bonding adhesive 404 is used for fixing the DIE403 and the FPC 405.
An FPC405 for connecting the DIE403 and a circuit in the electronic device to which the optical fingerprint recognition apparatus is mounted;
and a holder 407 for fixing the lens group 409 and the DIE403 to control the accuracy of defocus and eccentricity.
A screen assembly is also disposed above the optical fingerprint recognition device 400, and the screen assembly includes a display screen 410, foam 411 and a copper foil 412.
In the embodiment of the present application, the lens group 409 may be interference-fitted in the holder 407, so that the lens group 409 and the DIE403 are attached together, the various structural members of the optical fingerprint identification device may be adhered together by glue, and further, the optical fingerprint identification device may be fixed in the middle frame 408 of the electronic device.
Since the lens group 409 and the display screen 410 need to transmit optical signals, the foam 411 and the aluminum foil 412 in the screen assembly corresponding to the lens group 409 need to be perforated to allow the optical signals in the FOV range of the lens group 409 to pass through.
Hereinafter, the performance of the lens group according to the embodiment of the present application is specifically described in conjunction with embodiment 1, embodiment 2 and embodiment 3.
Example 1
The lens group includes two lenses (a first lens and a second lens) and a diaphragm, and fig. 5 shows a layout (layout) of the lens group in which: the device comprises a display screen, a first lens, a diaphragm, a second lens, an IR filter and filter attaching glue. The first lens is a concave lens, and the second lens is a convex lens.
For convenience of distinction and description, in order from the object side to the image side, the upper and lower surfaces of the display screen are respectively denoted as S1 and S2, the two surfaces of the first lens are respectively denoted as S3 and S4, the surface of the stop is denoted as S5, the two surfaces of the second lens are respectively denoted as S6 and S7, the surfaces of the IR filter are respectively denoted as S8 and S9, the surfaces of the filter bonding paste are denoted as S10 and S11, and the imaging plane is denoted as S12.
Further, by setting at least one of a radius of curvature, a thickness, a material, an effective diameter, a conic coefficient of each face of the lens group, and/or aspherical high-order term coefficients a2, a4, a6, A8, a10, a12, a14, a16 of aspherical lenses of the lens group, parameters of the lens group satisfy the above-mentioned first relationship, so that the FOV of the lens group is more than 100 degrees, the TV distortion is less than 5%, the F-number is less than 1.5, and the relative illuminance is more than 30%.
In embodiment 1, the first relationship and the other preset relationships that the parameters of the lens group satisfy include: 2.5<f1/R1<4，0.5<f1/R2<2.0，2.5<f1/R1<4，0.5<f1/R2<2.0，-1<f/f1<0，0<f/f2<1，-8<f1/f2<-4，0.2<R1/R2<0.5，-1<R1/R3<-0.4，2<R1/R4<4，-3<R2/R3<-1，5<R2/R4<12，-8<R3/R4<-3，0.1<f/TTL<0.2，0.45<Y’/(f*TTL)<0.6，n1＞1.54，v1＞55.50，n2＞1.54，v2＞55.98。
For example, in embodiment 1, the curvature radius, thickness, material, effective diameter, and conic coefficient of each of the surfaces S1 to S12 may be set to the corresponding parameters in table 1, and the aspherical high-order coefficient of the aspherical surfaces S1 to S12 may be set to the parameters shown in table 2.
TABLE 1
Surface of Surface type Radius of curvature Thickness of Material Effective diameter Coefficient of cone
S1 Article surface All-round 1.500 BK7 2.800
S2 Spherical surface All-round 0.730 1.888
S3 Aspherical surface -0.917 0.369 APL5014CL 0.780 -0.793
S4 Aspherical surface -3.314 0.209 0.334 -449.4978
S5 Diaphragm surface All-round 0.029 0.198
S6 Aspherical surface 1.105 0.383 APL5014CL 0.230 -12.050
S7 Aspherical surface -0.318 0.428 0.300 -0.152
S8 Spherical surface All-round 0.21 D263TECO 0.714
S9 Spherical surface All-round 0.020 BK7 0.714
S12 Image plane 0.619
In example 1, S9 and S10 can be regarded as the same surface, and S11 and S12 can be regarded as the same surface, that is, S10 and S9 correspond to the same parameters, and S12 and S11 correspond to the same parameters, so that the parameters corresponding to S10 and S11 are not shown.
TABLE 2
Surface of A2 A4 A6 A8 A10 A12 A14 A16
S3 2.376 -2.650 -15.248 103.052 -268.292 335.261 -162.505
S4 -6.043 827.466 -3.145e4 6.779e5 -8.129e5 5.054e7 -1.253e8
S6 1.219 -135.446 -1042.138 5.727e4 -4.766e4 -6.025e4 -9.217e7
S7 6.410 81.283 -996.731 9.470e4 -1.712e6 1.317e7 -3.648e7
Based on the parameters shown in tables 1 and 2, the parameters of the lens group shown in embodiment 1 can be determined as follows: TTL is 2.37666mm (i.e. distance S2 to S12), f1＝-2.4486，f20.49849, f 0.444242mm, R1-0.917, R2-3.314, R3-1.105, R4-0.318, and Y' 0.61. Wherein f is1/R1＝2.670229，f1/R2＝0.738865，f2(ii) R3 ═ 0.451122 and f2/R4＝-1.56758，f/f1＝-0.181427，f/f2＝0.891175，f1/f2＝-4.91203，R1/R2＝0.276705、R1/R3＝-0.82986、R1/R4＝2.883648、R2/R3＝-2.9991、R2/R4＝10.42138、R3/R4＝-3.47484，f/TTL＝0.186919，n1＝n2＝1.5445，Y’/(f*TTL)＝0.577754，CT1/CT2＝0.963446，v1＝v255.9867. It can be seen that the parameters of the lens group all satisfy the first relationship and the other predetermined relationships. Under the above parameters, fig. 6 to 8 are a relative illuminance diagram, an astigmatism diagram, a TV distortion diagram and a Modulation Transfer Function (MFT) diagram of the lens group in sequence.
As can be understood from the simulation graphs shown in fig. 6 to 8, the FOV of the lens group is 105 degrees, the working F-number is 1.47156, the TV distortion is 0.3268%, and the relative illuminance is 30%. Therefore, in the case where the parameters of the lens group satisfy the aforementioned first relationship, the lens group has the performance of a large FOV, a small working F-number, a small TV distortion, and a high relative illuminance.
Example 2
The lens group includes two lenses (a first lens and a second lens) and a diaphragm, and fig. 9 shows a layout (layout) of the lens group in which: the device comprises a display screen, a first lens, a diaphragm, a second lens, an IR filter and filter attaching glue. The first lens is a concave lens, and the second lens is a convex lens.
For convenience of distinction and description, in order from the object side to the image side, the upper and lower surfaces of the display screen are respectively denoted as S1 and S2, the two surfaces of the first lens are respectively denoted as S3 and S4, the surface of the stop is denoted as S5, the two surfaces of the second lens are respectively denoted as S6 and S7, the surfaces of the IR filter are respectively denoted as S8 and S9, the surfaces of the filter bonding paste are denoted as S10 and S11, and the imaging plane is denoted as S12.
Further, by setting at least one of a radius of curvature, a thickness, a material, an effective diameter, a conic coefficient of each face of the lens group, and/or aspherical high-order term coefficients a2, a4, a6, A8, a10, a12, a14, a16 of aspherical lenses of the lens group, parameters of the lens group satisfy the above-mentioned first relationship, so that the FOV of the lens group is more than 100 degrees, the TV distortion is less than 5%, the F-number is less than 1.5, and the relative illuminance is more than 30%.
In embodiment 2, the first relationship and the other preset relationships that the parameters of the lens group satisfy include: 2.5<f1/R1<4，0.5<f1/R2<2.0，2.5<f1/R1<4，0.5<f1/R2<2.0，-1<f/f1<0，0<f/f2<1，-8<f1/f2<-4，0.2<R1/R2<0.5，-1<R1/R3<-0.4，2<R1/R4<4，-3<R2/R3<-1，5<R2/R4<12，-8<R3/R4<-3，0.1<f/TTL<0.2，0.45<Y’/(f*TTL)<0.6，n1＞1.54，v1＞55.50，n2＞1.54，v2＞55.98。
For example, in embodiment 2, the curvature radius, thickness, material, effective diameter, and conic coefficient of each of the surfaces S1 to S12 may be set to the corresponding parameters in table 3, and the aspherical high-order coefficient of the aspherical surfaces S1 to S12 may be set to the parameters shown in table 4.
TABLE 3
Surface of Surface type Radius of curvature Thickness of Material Effective diameter Coefficient of cone
S1 Article surface All-round 1.5 BK7 2.800
S2 Spherical surface All-round 1.030 2.054
S3 Aspherical surface -0.765 0.352 APL5015AL 0.741 -2.086
S4 Aspherical surface -1.646 0.198 0.328 -473.887
S5 Diaphragm surface All-round 0.014 0.189
S6 Aspherical surface 1.081 0.345 APL5014CL 0.234 2.872
S7 Aspherical surface -0.288 0.372 0.303 -0.287
S8 Spherical surface All-round 0.21 D263TECO 0.450
S9 Spherical surface All-round 0.02 BK7 0.553
S12 Image plane 0.537
In example 2, S9 and S10 can be regarded as the same surface, and S11 and S12 can be regarded as the same surface, that is, S10 and S9 correspond to the same parameters, and S12 and S11 correspond to the same parameters, so that the parameters corresponding to S10 and S11 are not shown.
TABLE 4
Surface of A2 A4 A6 A8 A10 A12 A14 A16
S3 2.993 -4.078 -28.910 222.140 -677.996 -1008.13 -586.197
S4 -11.368 1363.600 -5.817e4 1.460e6 -2.077e7 1.540e8 -4.570e8
S6 -3.335 -2.755 -1654.813 1.039e5 -1.132e6 -6.601e6 1.429e8
S7 9.852 -178.693 -1557.330 2.091e5 -4.405e6 3.892e7 -1.223e8
Based on the parameters shown in tables 3 and 4, the parameters of the lens group shown in embodiment 2 can be determined as follows: TTL is 2.3775mm (i.e. distance S2 to S12), f1＝-3.3167，f20.47697, f 0.447816mm, R1-0.765, R2-1.646, R3-1.081, R4-0.288, and Y' 0.58. Wherein f is1/R1＝3.042844，f1/R2＝1.104462，f2(ii) R3 ═ 0.224562 and f2/R4＝-1.70346，f/f1＝-0.135019，f/f2＝0.938877，f1/f2＝-6.953687，R1/R2＝0.36297、R1/R3＝-0.51318、R1/R4＝3.89286、R2/R3＝-1.41384、R2/R4＝10.725、R3/R4＝-7.58571，f/TTL＝0.188356，n1＝n2＝1.5445，Y’/(f*TTL)＝0.544763，CT1/CT2＝0.89425，v1＝v255.9867. It can be seen that the parameters of the lens group all satisfy the first relationship and the other predetermined relationships. Under the above parameters, fig. 10 to 12 are a relative illuminance diagram, an astigmatism diagram, a TV distortion diagram and an MFT diagram of the lens group in sequence.
As can be understood from the simulation graphs shown in fig. 10 to 12, the FOV of the lens group is 110 degrees, the working F-number is 1.46254, the TV distortion is 0.0603%, and the relative illuminance is 30%. Therefore, in the case where the parameters of the lens group satisfy the aforementioned first relationship, the lens group has the performance of a large FOV, a small working F-number, a small TV distortion, and a high relative illuminance.
Example 3
The lens group includes two lenses (first and second lenses) and a diaphragm, and fig. 13 shows a layout (layout) of the lens group in which: the device comprises a display screen, a first lens, a diaphragm, a second lens, an IR filter and filter attaching glue. The first lens is a concave lens, and the second lens is a convex lens.
For convenience of distinction and description, in order from the object side to the image side, the upper and lower surfaces of the display screen are respectively denoted as S1 and S2, the two surfaces of the first lens are respectively denoted as S3 and S4, the surface of the stop is denoted as S5, the two surfaces of the second lens are respectively denoted as S6 and S7, the surfaces of the IR filter are respectively denoted as S8 and S9, the surfaces of the filter bonding paste are denoted as S10 and S11, and the imaging plane is denoted as S12.
Further, by setting at least one of a radius of curvature, a thickness, a material, an effective diameter, a conic coefficient of each face of the lens group, and/or aspherical high-order term coefficients a2, a4, a6, A8, a10, a12, a14, a16 of aspherical lenses of the lens group, parameters of the lens group satisfy the above-mentioned first relationship, so that the FOV of the lens group is more than 100 degrees, the TV distortion is less than 5%, the F-number is less than 1.5, and the relative illuminance is more than 30%.
In embodiment 3, the first relationship and the other preset relationships that the parameters of the lens group satisfy include: 2.5<f1/R1<4，0.5<f1/R2<2.0，2.5<f1/R1<4，0.5<f1/R2<2.0，-1<f/f1<0，0<f/f2<1，-8<f1/f2<-4，0.2<R1/R2<0.5，-1<R1/R3<-0.4，2<R1/R4<4，-3<R2/R3<-1，5<R2/R4<12，-8<R3/R4<-3，0.1<f/TTL<0.2，0.45<Y’/(f*TTL)<0.6，n1＞1.54，v1＞55.50，n2＞1.54，v2＞55.98。
For example, in embodiment 3, the curvature radius, thickness, material, effective diameter, and conic coefficient of each of the surfaces S1 to S12 may be set to the corresponding parameters in table 5, and the aspherical high-order coefficient of the aspherical surfaces S1 to S12 may be set to the parameters shown in table 6.
TABLE 5
Figure BDA0001872135550000161
Figure BDA0001872135550000171
In example 3, S9 and S10 can be regarded as the same surface, and S11 and S12 can be regarded as the same surface, that is, S10 and S9 correspond to the same parameters, and S12 and S11 correspond to the same parameters, so that the parameters corresponding to S10 and S11 are not shown.
TABLE 6
Surface of A2 A4 A6 A8 A10 A12 A14 A16
S3 2.976 -3.625 -28.550 223.179 -676.039 1030.329 -651.376
S4 -5.917 1323.094 -5.719e4 1.414e6 -1.970e7 1.444e8 -4.283e8
S6 4.050 -182.362 -5319.101 1.587e5 3.753e5 1.918e7 -6.707e8
S7 6.008 -117.483 -1813.586 2.030e5 -4.438e6 3.874e7 -1.129e8
Based on the parameters shown in tables 5 and 6, the parameters of the lens group shown in embodiment 3 can be determined as follows: TTL 2.54mm (i.e., distance S2 to S12), f1＝-3.0433mm，f20.4557mm, f 0.397686mm, R1-1.090, R2-3.003, R3-2.124, R4-0.280 and Y' 0.501. Wherein f is1/R1＝3.97817，f1/R2＝1.848906，f2(ii) R3 ═ 0.421554 and f2/R4＝-1.58229，f/f1＝-0.130676，f/f2＝0.872693，f1/f2＝-6.678297，R1/R2＝0.46474、R1/R3＝-0.70768、R1/R4＝2.65625、R2/R3＝-1.52266、R2/R4＝5.715278、R3/R4＝-3.75347，f/TTL＝0.156569，n1＝n2＝1.5445，Y’/(f*TTL)＝0.495979，CT1/CT2＝1.02029，v1＝v255.9867. It can be seen that the parameters of the lens group all satisfy the first relationship and the other predetermined relationships. Under the above parameters, fig. 14 to 16 are a relative illuminance diagram, an astigmatism diagram, a TV distortion diagram and an MFT diagram of the lens group in sequence.
As can be understood from the simulation graphs shown in fig. 14 to 16, the FOV of the lens group is 105 degrees, the working F-number is 1.41653, the TV distortion is 1.32%, and the relative illuminance is 30%. Therefore, in the case where the parameters of the lens group satisfy the aforementioned first relationship, the lens group has the performance of a large FOV, a small working F-number, a small TV distortion, and a high relative illuminance.
It should be understood that the positions corresponding to the parameters in tables 1 to 6 are blank, which means that there is no such parameter or the value of the parameter is 0. For example, a blank in a column of material may represent air; for another example, a blank in the aspherical high-order term coefficient a2 indicates that the coefficient is 0.
To sum up, the lens group of this application embodiment provides a wide angle short burnt lens group, adopts this lens group can gather the fingerprint information of bigger region to short burnt design makes on being applied to the limited electronic equipment in vertical space that this lens group can be better, has strengthened the suitability of this lens group.
Fig. 17 is a schematic block diagram of a fingerprint recognition device according to an embodiment of the present application, and as shown in fig. 17, the fingerprint recognition device 1700 includes a lens system 1710, and the lens system 1710 may include one lens group or two lens groups to further enlarge the area of a fingerprint collection area. Wherein each lens group can be, for example, the lens group 30 in the foregoing embodiments.
When the fingerprint recognition device 1700 includes two lens groups, the two lens groups are arranged side by side in the radial direction, for example, in the manner shown in fig. 18, so as to further expand the field of view and reduce the total length of the lens system, thereby reducing the longitudinal space of the fingerprint recognition device 1700 when assembled.
The fingerprint identification device in the embodiment of the application uses the lens group, and two lens groups are arranged in the fingerprint identification device side by side, so that the contradiction between the expansion of the area of a fingerprint acquisition region and the reduction of the length of a lens system is effectively solved. Make the total length of lens system can be less than 2.6mm to can realize 4 x 7 mm's field of view scope, this fingerprint identification device's fingerprint collection region can reach 4 x 7mm promptly, thereby can acquire more fingerprint information that the user pointed, improve the reliability of fingerprint detection, and promote the user and carry out the experience when fingerprint detection.
Optionally, the fingerprint recognition apparatus 1700 may include an optical fingerprint sensor 1720, such as the DIE403 shown in fig. 4, disposed below the lens system 1710, and configured to receive the optical signal transmitted through the lens system 1710 and process the optical signal to obtain fingerprint information included in the optical signal.
Optionally, the fingerprint recognition device 1700 may include an optical fingerprint sensor, and the optical fingerprint sensor 1720 may include two sensing arrays, each sensing array corresponds to one lens group, each lens group corresponds to one sub-area in the fingerprint collection area, and each lens group is configured to guide the optical signal in the corresponding sub-area to the corresponding sensing array below the lens group. Alternatively, the fingerprint recognition device 1700 may include two optical fingerprint sensors respectively corresponding to the two lens groups, wherein each lens group is configured to guide the optical signal in the sub-area corresponding to the lens group to its corresponding optical fingerprint sensor and to be collected by the sensing array on the optical fingerprint sensor.
Optionally, the fingerprint recognition device 1700 may correspond to the optical fingerprint recognition device 400 shown in fig. 4, and the fingerprint recognition device 1700 may further include structures in the optical fingerprint recognition device 400, such as the IR filter 301, the bracket 407, and the like, which are not described in detail herein.
It should be understood that fig. 18 is only a schematic illustration. In a specific implementation, the two lens groups arranged side by side may be disposed below the same display screen, as shown in fig. 20, the two lens groups are disposed in an imaging area of the display screen to form a fingerprint collecting area on the display screen, and the two imaging areas may have a certain overlapping area. On the other hand, the optical fingerprint sensors (or referred to as optical fingerprint sensor chips, optical imaging chips, image sensing chips, etc.) under the two lens groups may be respectively and correspondingly provided with two sensing arrays, and a filter or an IR filter is covered above the two sensing arrays. Based on the structure, the fingerprint acquisition ranges of the two sensing arrays can respectively correspond to the two imaging areas of the lens group, the two sensing arrays respectively detect a part (called sub-image) of the fingerprint image pressed on the fingerprint acquisition area of the display screen, and the image acquired by the overlapping area can be used for splicing the sub-images acquired by the two imaging areas to acquire a fingerprint image with a large area.
It should be understood that the embodiment of the present application is described by taking the fingerprint identification device including one or two lens groups as an example, but the present application may also include more lens groups, which is not limited herein.
The embodiment of the present application further provides an electronic device, as shown in fig. 19, where the electronic device 1900 includes a fingerprint identification device 1910, and the fingerprint identification device 1910 may be the fingerprint identification device 1700 in the foregoing embodiment or the optical fingerprint identification device 400 in the embodiment shown in fig. 4.
Optionally, the electronic device may further include a screen assembly 1920 including a display screen, foam, and copper foil, disposed over the lens system in the fingerprint recognition device 1910; the area of the foam and the area of the copper foil above the lens system are opened, so that optical signals containing fingerprint information can enter the lens system.
By way of example and not limitation, the electronic device 1900 may be a terminal device, a mobile phone, a tablet computer, a notebook computer, a desktop computer, an in-vehicle electronic device, or a wearable smart device that includes full functionality, a large size, and may implement all or part of the functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application function, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets for physical sign monitoring, smart jewelry and other devices.
It should be understood that the specific examples in the embodiments of the present application are for the purpose of promoting a better understanding of the embodiments of the present application, and are not intended to limit the scope of the embodiments of the present application, and that various modifications and variations can be made by those skilled in the art based on the above embodiments and fall within the scope of the present application.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (19)

1. A lens group comprising a first lens and a second lens arranged in order from an object side to an image side, wherein:
the first lens comprises a first lens with negative focal power, a paraxial region of the first lens on an object side is a concave surface, a paraxial region of the first lens on an image side is a convex surface, and at least one surface of two surfaces of the first lens is an aspheric surface;
the second lens comprises a second lens with positive focal power, the second lens is a biconvex lens, and at least one of two surfaces of the second lens is an aspheric surface;
wherein the parameters of the lens group satisfy a first relationship such that the FOV of the field of view of the lens group is greater than a first threshold, and the length of the lens group is less than a second threshold, the maximum image height Y on the imaging surface of the lens group’TTL (transistor-transistor logic), TTL (distance between lower surface of display screen and imaging surface) and focal length of lens groupfSatisfies 0.45<Y’/(f*TTL)<0.6；
Wherein the parameters of the lens group include at least two of: focal length of the lens groupfFocal length of the first lensf 1 Focal length of the second lensf 2 A radius of curvature R1 of an object-side surface of the first lens, a radius of curvature R2 of an image-side surface of the first lens, a radius of curvature R3 of an object-side surface of the second lens, and a radius of curvature R4 of an image-side surface of the second lens.
2. The lens group of claim 1, wherein the first relationship comprises: 2.5<f 1 /R1<4 and/or 0.5<f 1 /R2<2.0。
3. The lens group according to claim 1 or 2, wherein said first relationship further comprises: 0.2<f 2 /R3<0.5 and/or-2<f 2 /R4<-1。
4. The lens group of claim 1 or 2, wherein the first relationship further comprises at least one of: -1< f/f 1 <0、0< f/f 2 <1、-8< f 1 /f 2 <-4。
5. The lens group of claim 1 or 2, wherein the first relationship further comprises at least one of: 0.2< R1/R2<0.5, -1< R1/R3< -0.4, -2 < R1/R4<4, -3< R2/R3< -1, -5 < R2/R4<12, -8< R3/R4< -3.
6. The lens group of claim 1 or 2, wherein the first threshold is 100 degrees.
7. The lens group of claim 1 or 2, wherein the second threshold is 2.6 mm.
8. The lens group according to claim 1 or 2, wherein a thickness CT1 of the first lens in the optical axis direction and a thickness CT2 of the second lens in the optical axis direction satisfy: 0.5< CT1/CT2< 1.5.
9. The lens group of claim 1 or 2, wherein TTL is a distance from the lower surface of the display to the image plane and the focal length of the lens groupfSatisfies the following conditions: 0.1<f/TTL<0.2。
10. The lens group of claim 1 or 2, wherein the refractive index of the material of the first lensn 1 > 1.54, the Abbe number of the material of the first lensv 1 ＞55.50。
11. The lens group of claim 1 or 2, wherein the refractive index of the material of the second lensn 2 > 1.54, the Abbe number of the material of the second lensv 2 ＞55.98。
12. The lens group according to claim 1 or 2, further comprising:
and the diaphragm is arranged between the first lens and the second lens.
13. The lens group according to claim 1 or 2, characterized in that the TV distortion of said lens group is less than 5%, and/or the relative illuminance of said lens group is more than 30%, and/or the F-number of said lens group is less than 1.5.
14. A fingerprint recognition apparatus comprising a lens system including one lens group as claimed in any one of claims 1 to 13, or two of said lens groups arranged side by side in a radial direction.
15. The fingerprint recognition device of claim 14, further comprising:
and the optical fingerprint sensor is arranged below the lens system and used for receiving the optical signal transmitted by the lens system and processing the optical signal so as to acquire fingerprint information carried in the optical signal.
16. The fingerprint recognition device of claim 15, wherein the optical fingerprint sensor has a fingerprint acquisition area greater than 4mm x 7 mm.
17. The fingerprint recognition device according to claim 14 or 15, wherein the fingerprint recognition device further comprises: a support;
wherein the lens system is interference fitted in the holder.
18. An electronic device, comprising: the fingerprint recognition device according to any one of claims 14 to 17.
19. The electronic device of claim 18, further comprising:
the screen assembly comprises a display screen, foam and copper foil and is arranged above a lens system in the fingerprint identification device;
and the area of the foam and the copper foil above the lens system is opened so as to enable an optical signal containing fingerprint information to enter the lens system.
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