CN109564338A

CN109564338A - Lens group, fingerprint identification device and electronic equipment

Info

Publication number: CN109564338A
Application number: CN201880002082.XA
Authority: CN
Inventors: 葛丛; 李林欣
Original assignee: Shenzhen Huiding Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd; Goodix Technology Hong Kong Co Ltd
Priority date: 2018-11-08
Filing date: 2018-11-08
Publication date: 2019-04-02
Anticipated expiration: 2038-11-08
Also published as: WO2020093312A1; CN109564338B; CN112230403B; CN112230403A

Abstract

The embodiment of the present application provides a kind of lens group, fingerprint identification device and electronic equipment, including the first camera lens and the second camera lens set gradually from the object side to the image side, first camera lens includes the first lens of negative power, first lens are the S-shaped bent moon eyeglass that object side is convex surface, and it is aspherical for having at least one face in two faces of first lens；Second camera lens includes the second lens of positive light coke, and second lens are biconvex eyeglass, and it is aspherical for having at least one face in two faces of second lens；Wherein, the parameter of the lens group meets the first relationship, so that the field angle FOV of the lens group is greater than first threshold.

Description

Lens group, fingerprint identification device and electronic equipment

Technical field

The invention relates to optical imaging fields, and more particularly, to lens group, fingerprint identification device and electricity Sub- equipment.

Background technique

With the high speed development of mobile phone industry, fingerprint identification technology is increasingly paid attention to by people, shields lower fingerprint recognition skill The functionization of art has become needed for masses.Fingerprint identification technology is to acquire light source by optical fingerprint sensor to issue under optical panel The reflected light that is reflected to form in finger of light, the finger print information of finger is carried in reflected light, to realize the lower fingerprint of screen Identification.Wherein, can be guided by the optical signal that lens system returns to finger in fingerprint identification device, reflected light need through Optical fingerprint sensor is reached after crossing lens system.In order to obtain more finger print informations, need to expand lens system as far as possible Visual field to acquire greater area of fingerprint image, but it is longer to will lead to designed lens system in this way, to a certain degree On occupy electronic equipment inherently small longitudinal space.Therefore, how to be obtained in the case where not increasing lens system length Suitable visual field size, becomes urgent problem to be solved.

Summary of the invention

The embodiment of the present application provides a kind of lens group, fingerprint identification device and electronic equipment, can not increase camera lens Suitable visual field size is obtained in the case where system length, to realize adopting for the finger print information in biggish fingerprint collecting region Collection.

In a first aspect, providing a kind of lens group, comprising: including the first camera lens set gradually from the object side to the image side and Two camera lenses.First camera lens includes the first lens of negative power, and first lens are the S-shaped meniscus lens that object side is convex surface Piece, it is aspherical for having at least one face in two faces of first lens；Second camera lens includes the second of positive light coke Lens, second lens are biconvex eyeglass, and it is aspherical for having at least one face in two faces of second lens；

Wherein, the parameter of the lens group meets the first relationship, so that the field angle FOV of the lens group is greater than the first threshold Value, and the length of the lens group is made to be less than second threshold.

Wherein, the parameter of the lens group includes at least two in following: the focal length f of the lens group, described first The focal length f of lens₁, second lens focal length f₂, first lens the radius of curvature R 1, described towards object side one side First lens towards image side radius of curvature R 2, second lens towards object side while radius of curvature R 3 and institute State the radius of curvature R 4 towards image side one side of the second lens.

Therefore, the lens group of the embodiment of the present application passes through the camera lens for being laid out different focal powers, and includes extremely in each camera lens Few one is aspherical, and the parameter by the way that lens group is arranged meets the first relationship, so that the lens group has biggish FOV, To realize the acquisition of the finger print information in larger fingerprint collecting region, the optical fingerprint identification device for using the lens group is promoted Fingerprint recognition performance.

In one possible implementation, first relationship includes: 2.5 < f₁/ R1 < 4 and 0.5 < f₁/R2<2.0。

In one possible implementation, first relationship further include: 2.5 < f₁/ R1 < 4 and 0.5 < f₁/R2<2.0。

In one possible implementation, first relationship further include: -1 < f/f₁<0、0<f/f₂<1、-8<f₁/f₂ <-4。

In one possible implementation, first relationship further include: 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 degree.

In one possible implementation, the second threshold is 2.6 millimeters.

In one possible implementation, first lens are along the thickness CT1 of optical axis and second lens along light Meet between the thickness CT2 of axis: 0.5 < CT1/CT2 < 1.5.

In one possible implementation, distance TTL and the lens group of the lower surface of display screen to imaging surface Meet between focal length f: 0.1 < f/TTL < 0.2.

In one possible implementation, the following table of the maximum image height Y ' on the imaging surface of the lens group, display screen Face to imaging surface distance TTL and the lens group focal length f between meet: 0.45 < Y '/(f*TTL) < 0.6.

In one possible implementation, the refractive index n of the material of first lens₁> 1.54, described first thoroughly The abbe number v of the material of mirror₁> 55.50.

In one possible implementation, the refractive index n of the material of second lens₂> 1.54, described second thoroughly The abbe number v of the material of mirror₂> 55.98.

In one possible implementation, the lens group further include: diaphragm is set to first camera lens and described Between second camera lens.

In one possible implementation, the TV of the lens group distorts less than 5%, the relative illumination of the lens group Greater than 30%, the F number of the lens group is less than 1.6.

Second aspect, provides a kind of fingerprint identification device, including lens system, and the lens system includes one such as the Lens group in any possible implementation of one side or first aspect, or including two institutes radially arranged side by side State lens group.

In one possible implementation, the fingerprint identification device further includes optical fingerprint sensor, which refers to Line sensor is set to the lower section of the lens system, for receiving the optical signal after lens system transmission, and to institute It states optical signal to be handled, to obtain the finger print information carried in the optical signal.

In one possible implementation, the fingerprint identification device further includes bracket, wherein the lens system mistake It is full of and is assemblied in the bracket.

The third aspect provides a kind of electronic equipment, any possible realization including such as second aspect or second aspect Fingerprint identification device in mode.

In one possible implementation, the electronic equipment further includes screen assembly, which includes display Screen, foam and copper foil, are set to the top of the lens system in the fingerprint identification device.Wherein, above the lens system The regional opening of the corresponding foam and the copper foil, so that the optical signal including finger print information enters the lens system.

Detailed description of the invention

Fig. 1 is the floor map for the electronic equipment that the application can be applicable in.

Fig. 2 is partial cutaway schematic view of the electronic equipment shown in FIG. 1 along A-A '.

Fig. 3 is according to the structural schematic diagram of the lens group of the embodiment of the present application.

Fig. 4 identifies the structural schematic diagram of mould group according to the optical finger print of the embodiment of the present application.

Fig. 5 is the schematic diagram according to a kind of layout of the lens group of the embodiment of the present application.

Fig. 6 is the relative illumination figure of the lens group of layout shown in fig. 5.

Fig. 7 (a) and Fig. 7 (b) is the astigmatism figure and distortion figure for the lens group being laid out shown in Fig. 5 respectively.

Fig. 8 is the MTF figure of the lens group of layout shown in fig. 5.

Fig. 9 is the schematic diagram according to another layout of the lens group of the embodiment of the present application.

Figure 10 is the relative illumination figure of the lens group of layout shown in Fig. 9.

Figure 11 (a) and Figure 11 (b) is the astigmatism figure and distortion figure for the lens group being laid out shown in Fig. 9 respectively.

Figure 12 is the MTF figure of the lens group of layout shown in Fig. 9.

Figure 13 is the schematic diagram according to another layout of the lens group of the embodiment of the present application.

Figure 14 is the relative illumination figure of the lens group of layout shown in Figure 13.

Figure 15 (a) and Figure 15 (b) is the astigmatism figure and distortion figure of the lens group of layout shown in Figure 13 respectively.

Figure 16 is the MTF figure of the lens group of layout shown in Figure 13.

Figure 17 is the structural schematic diagram according to the fingerprint identification device of the embodiment of the present application.

Figure 18 is the position view for two lens groups for including in fingerprint identification device.

Figure 19 is the schematic block diagram according to the electronic equipment of the embodiment of the present application.

Figure 20 is the structural schematic diagram according to the electronic equipment of the embodiment of the present application.

Specific embodiment

Below in conjunction with attached drawing, technical solutions in the embodiments of the present application is described.

As electronic equipment steps into comprehensive screen epoch, the extruding that electronic equipment front fingerprint collecting region is shielded comprehensively, Therefore shield under (Under-display or Under-screen) fingerprint identification technology more and more attention has been paid to.Shield lower fingerprint to know Other technology, which refers to, is mounted on fingerprint identification device such as optical fingerprint identification device below display screen, to realize in display screen Display area in carry out fingerprint recognition operation, do not need in electronic equipment front in addition to display area region setting fingerprint adopt Collect region.

Fingerprint identification technology carries out fingerprint induction and its using the light returned from the top surface of device display screen under optical panel His inductive operation.The light of the return carries the information of the object (such as finger) contacted with the top surface, by acquiring and detecting this The light of return realizes the particular optical fingerprint sensor being located at below display screen.The design of optical fingerprint sensor can be logical It crosses and is configured to acquire and detect the optical element of the light returned properly to realize desired optical imagery.

It should be understood that the technical solution of the embodiment of the present application can be applied to various electronic equipments, such as smart phone, notes The portable or mobiles such as this computer, tablet computer, game station calculate equipment and electronic databank, automobile, bank's automatic cabinet Other electronic equipments such as member's machine (Automated Teller Machine, ATM), but the embodiment of the present application does not limit this.

Figures 1 and 2 show that a kind of electronic equipment 100 that the fingerprint identification device of the embodiment of the present application can be applicable in is shown It is intended to, wherein Fig. 1 is the front schematic view of electronic equipment 100, and Fig. 2 is that electronic equipment 100 shown in FIG. 1 is cutd open along the part of A-A ' Face structural schematic diagram.

As shown in Figure 1 and shown in Fig. 2, which includes display screen 120 and optical fingerprint identification device (back Also referred to as fingerprint identification device) 130, wherein the optical fingerprint identification device 130 has one or more induction arrays, The induction arrays are arranged at the regional area of 120 lower section of display screen, so that optical finger print identification dress The fingerprint collecting region (or induction region) 103 for setting 130 is at least partially disposed at the display area 102 of the display screen 120.

It should be appreciated that the area in the fingerprint collecting region 103 can be with the induction of the optical fingerprint identification device 130 The area of array is different, such as example, by the light path design, reflective folding light path design or other light of lens imaging The light path designs such as convergence or reflection, can make the area in the fingerprint collecting region 103 of the optical fingerprint identification device 130 Greater than the area of 130 induction arrays of optical fingerprint identification device.In other substitution implementations, if using such as light Line collimating fashion carry out optical path guidance, the fingerprint collecting region 103 of the optical fingerprint identification device 130 can also be designed to The area of the induction arrays of the optical fingerprint identification device 130 is consistent.

As shown in Figure 1, the fingerprint collecting region 103 is located among the display area 102 of the display screen 120, therefore, User is when needing to be unlocked the electronic equipment or other fingerprint authentications, it is only necessary to press finger in place In the fingerprint collecting region 103 of the display screen 120, it can realize that fingerprint inputs.Since fingerprint detection can be in screen in fact It is existing, therefore fingerprint key (such as Home is arranged without the special reserved space in its front for electronic equipment 100 using the above structure Key), so as to which using screen scheme comprehensively, i.e., the display area 102 of the described display screen 120 can extend substantially to entire electronics The front of equipment 100.

In as one embodiment, the display screen 120 can be self light emitting display panel, use spontaneous light display unit As display pixel, for example, Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) display screen or Micro-led (Micro-LED) display screen.For using OLED display screen, the optical fingerprint identification device 130 It can use OLED display unit (i.e. OLED light source) work that the OLED display screen 120 is located at the fingerprint identification region 103 For the excitation light source of optical finger print detection.

In other embodiments, the optical fingerprint identification device 130 can also use built-in light source or external light source To provide the optical signal for carrying out fingerprint detection.In this case, the optical fingerprint identification device 130 can be adapted for Non-spontaneous smooth display screen, such as liquid crystal display or other passive light emitting displays.To apply with backlight module and For the liquid crystal display of liquid crystal display panel, fingerprint detection under the screen to support liquid crystal display, the optics of the electronic equipment 100 System of fingerprints can also include for optical finger print detection excitation light source, the excitation light source can be specially infrared light supply or The light source of person's specific wavelength non-visible light can be set below the backlight module of the liquid crystal display or be arranged in institute The fringe region below the cover sheet of electronic equipment 100 is stated, and liquid crystal surface can be set in the optical fingerprint identification device 130 It is guided below the fringe region of plate or cover sheet and by optical path so that fingerprint detection light can reach the optics refers to Line identification device 130；Alternatively, the optical fingerprint identification device 130 also can be set below the backlight module, and described Backlight module is by carrying out aperture or other optical designs to film layers such as diffusion sheet, blast piece, reflector plates to allow fingerprint to examine Light is surveyed to pass through liquid crystal display panel and backlight module and reach the optical fingerprint identification device 130.

Also, the induction arrays of the optical fingerprint identification device 130 are specially optical detector (Photo detector) Array comprising multiple optical detectors in array distribution, the optical detector can be used as optical sensor as described above Unit.When finger touch, press or close to (for ease of description, the application is referred to as touching) in the fingerprint identification region When 103, the light that the display unit of the fingerprint identification region 103 issues occurs to reflect and formed anti-in the fingerprint of finger surface Light is penetrated, wherein the reflected light of the wrinkle ridge of the finger print and line paddy is different, reflected light is from the display screen 120 and by institute It states photodetector array and is received and converted to corresponding electric signal, i.e. fingerprint detection signal.Based on the fingerprint detection signal Fingerprint image data can be obtained, and can be verified with further progress fingerprint matching, thus real in the electronic equipment 100 Existing optical finger print identification function.

It should be understood that the electronic equipment 100 further includes transparency protected cover board 110, the lid in specific implementation Plate 110 can be specially transparent cover plate, such as glass cover-plate or sapphire cover board, be located at the top of the display screen 120 And cover the front of the electronic equipment 100.Therefore, in the embodiment of the present application, so-called finger is touched, presses or is approached The display screen 120 actually refer to finger touch, pressing or close to above the display screen 120 cover board 110 or Cover the protective layer of the cover board 110.In addition, the electronic equipment 100 can also include touch sensor, the touch Sensor can be specially touch panel, can be set on 120 surface of display screen, can also partially or wholly integrate To inside the display screen 120, i.e., the described display screen 120 is specially touching display screen.

As a kind of optional implementation, as shown in Fig. 2, the optical fingerprint identification device 130 includes optical detection Unit 134 and optical module 132, the optical detection unit 134 are electric including the induction arrays and with the induction arrays Property connection reading circuit and other auxiliary circuits, a chip (Die) can be produced on by semiconductor technology；That is institute Optical imagery chip or image sensor chip (back also referred to as optical finger print biography can be produced on by stating optical detection unit 134 Sensor or optical fingerprint sensor chip).The induction in the optical detection unit 134 can be set in the optical module 132 The top of array, can specifically include optical filter (or filter plate, optical filter (Filter)), optical path guide structure with And other optical elements, the optical filter can be used for filtering out the environment light for penetrating finger, and the optical path guide structure is main It will be reflected from finger surface for the optical paths guidance such as the light propagated downwards being collimated, being modulated or being converged with realizing Reflected light be directed to the induction arrays and carry out optical detection.

In specific implementation, the optical module 132 can be encapsulated in the same optics with the optical detection unit 134 The chip exterior where the optical detection unit 134 can also be arranged in the optical module 132 by fingerprint chip, such as The optical module 132 is fitted in above the chip, or the subelement of the optical module 132 is integrated in above-mentioned Among chip.Wherein, there are many implementations for the optical path guide structure of the optical module 132, for example can be specially half The optical path modulation device or beam path alignment device that conductor silicon wafer or other substrates are made, with multiple light path modulation units Perhaps the collimation unit light path modulation unit or collimation unit can be specially microwell array.Alternatively, the optical waveguide layer It can be optical lens (Lens) layer, there is one or more lens units, such as one or more non-spherical lens compositions Lens group (hereinafter also referred to as lens group).From the reflected reflected light of finger through the microwell array or the lens list It after member carries out beam path alignment or convergence, and is received by optical sensor unit below, accordingly, the induction arrays can be with Detect the fingerprint image of finger.

The lower section of the optical fingerprint identification device 130 is also provided with circuit board 140, such as flexible circuit board (Flexible Printed Circuit, FPC), the optical fingerprint identification device 130 can for example be arrived by pad solder The circuit board 140, and realized and other of other peripheral circuits or the electronic equipment 100 by the circuit board 140 The electrical interconnection and signal transmission of element.For example, the optical fingerprint identification device 130 can be connect by the circuit board 140 The control signal of the processing unit of the electronic equipment 100 is received, and can also be examined the fingerprint by the circuit board 140 Signal is surveyed to export to the processing unit of the electronic equipment 100 or control unit etc..

The embodiment of the present application is acquired using optical signal of the lens group to the finger reflection above display screen, and will The optical signal guides the optical fingerprint sensor to lens group, and the finger print information of the finger is carried in the optical signal, thus Realize optical finger print identification.

For convenient for better understanding, simply introduce first designed in the embodiment of the present application can be used for evaluating the lens group The parameter index of energy.

Field angle (Field Of View, FOV): the field range for characterizing camera lens, in the equal situation of Lens Under, the FOV of camera lens is bigger, indicates that the camera lens can obtain the information in bigger region, i.e., the information content that can be obtained using the camera lens It is bigger.

F-number or F number (f-number, Fno): i.e. the inverse of camera lens relative aperture enters for characterizing through camera lens The amount light of the induction arrays of optical finger print device.F number is smaller, and the amount light for indicating entry into camera lens is more.

TV distortion: for measuring the visual distortion degree of image.It is appreciated that TV distortion is smaller, imaging effect is better.

Relative illumination (Relative Illumination, RI): refer to illumination and the center of the different coordinate points on imaging surface The ratio between the illumination of point, relative illumination is smaller, and the illumination of imaging surface is more uneven, is easy to produce certain positions under-exposures or center The problem of overexposure, influences image quality；Relative illumination is bigger, and image quality is higher.

Fig. 3 is according to the schematic diagram of the lens group of the embodiment of the present application, as shown in figure 3, the lens group 30 includes: The first camera lens 31 and the second camera lens 32 set gradually from the object side to the image side.

Wherein, first lens of first camera lens 31 including negative power, first lens be object side be convex surface S-shaped it is curved Month eyeglass, it is aspherical for having at least one face in two faces of first lens；Second camera lens 32 includes the of positive light coke Two lens, second lens are biconvex eyeglass, and it is aspherical for having at least one face in two faces of second lens.

It should be understood that in the embodiment of the present application, which can be a lens i.e. the first lens, or can also be with For one group of lens, as long as the combination focal power of this group of lens is negative power；Similarly, which may be one Lens i.e. the second lens, or may be one group of lens, as long as the combination focal power of this group of lens is positive light coke.Under Face is the first lens with the first camera lens and the second camera lens is to be described for the second lens.First eyeglass and this Two eyeglasses can for example use resin material or other plastic materials, be not construed as limiting here.

Further, the parameter of the lens group meets the first relationship, so that the field angle FOV of the lens group is greater than the first threshold Value, and the length of the lens group is made to be less than second threshold.Wherein, the parameter of the lens group includes at least two in following: The focal length f of the focal length f of the lens group, first lens₁, second lens focal length f₂, first lens towards object side one side Radius of curvature R 1, first lens towards image side radius of curvature R 2, second lens towards object side while The radius of curvature R 4 towards image side one side of radius of curvature R 3 and second lens.

In the embodiment, which includes at least one in each camera lens by being laid out the camera lens of different focal powers It is aspherical, and the first relationship of satisfaction of the parameter by the way that lens group is arranged, so that in the case where the length of the lens group is certain, The light for using the lens group is promoted with biggish FOV to realize the acquisition of the finger print information in biggish fingerprint collecting region Learn the fingerprint recognition performance of fingerprint identification device.In other words, in the case where obtaining the FOV of same size, reduce the lens group Length, thus occupied longitudinal space when reducing the lens assembling assigned in electronic equipment.

The first relationship that the parameter of the lens group is met may include at least one of the following parameters relationship: f₁Respectively Relationship between R1 and R2, for example, f₁/ R2 is in preset numberical range, f₁/ R2 is in preset numberical range；f₂Respectively Relationship between R3 and R4, for example, f₂/ R3 is in preset numberical range, f₂/ R4 is in preset numberical range；f,f₁With f₂Between relationship, for example, f/f₁In preset numberical range, f/f₂In preset numberical range, f₁/f₂In preset number It is worth in range；Relationship between R1, R2, R3 and R4, for example, R1/R2, in preset numberical range, R1/R3 is in preset number It is worth in range, R1/R4 is in preset numberical range, and R2/R3 is in preset numberical range, and R2/R4 is in preset numerical value model In enclosing, R3/R4 is in preset numberical range etc..

It is less than second threshold as target using the length that the FOV of lens group is greater than first threshold and the lens group, this first Threshold value for example can be 100 degree, which can be for example 2.6mm, by emulating to lens group, and combine experience It is worth, first relationship that should meet between available above-mentioned parameter.

For example, first relationship includes: 2.5 < f₁/ R1 < 4 and/or 0.5 < f₁/R2<2.0。

In another example first relationship includes: 0.2 < f₂/ R3 < 0.5 and/or -2 < f₂/R4<-1。

In another example first relationship includes at least one of the following: -1 < f/f₁<0、0<f/f₂<1、-8<f₁/f₂<-4。

In another example first relationship includes at least one of the following: 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 above-mentioned whole parameters relationships, partial parameters relationship also can satisfy, it is only necessary to Guarantee that FOV is greater than first threshold.For example, when meeting 2.5 < f₁/ R1 < 4 and 0.5 < f₁When/R2 < 2.0, which can reach It is greater than 100 degree of demand to FOV, and the length (distance of screen lower surface to image planes) of the lens group is effectively reduced, such as should The length of lens group is less than 2.6mm, thus occupied longitudinal space when reducing the lens assembling assigned in electronic equipment；Further Ground, as 0.2 < f of satisfaction₂/ R3 < 0.5 and/or -2 < f₂When/R4 < -1, the available effective control of the aberration of the lens group is effectively mentioned Rise the image quality of lens group；Further, as -1 < f/f of satisfaction₁<0、0<f/f₂<1、-8<f₁/f₂When < -4, this can be reduced The depth of field of lens group, lift pins are to the image quality in certain surface whereby, such as the image quality of screen upper surface；Into one Step ground, when meet 0.2 < R1/R2 < 0.5, -1 < R1/R3 < -0.4,2 < R1/R4 < 4, -3 < R2/R3 < -1,5 < R2/R4 < 12, -8 < When R3/R4 < -3, the susceptibility of the lens group can be reduced, i.e. foozle, should to improve to imaging effect effect Yields in lens group manufacturing process.

Based on this as can be seen that by the parameters in setting lens group, can make the lens group have FOV it is big, Small and big relative illumination performance that work F number is small, TV distorts, is conducive to the finger for promoting the fingerprint recognition mould group using the lens group Line recognition performance.

Optionally, in some embodiments, first lens are along the thickness CT1 of optical axis direction and second lens along optical axis Also meet preset relationship between the thickness CT2 in direction, such as meet 0.5 < CT1/CT2 < 1.5, whereby when the lens group knot Structure is firmer, to promote the service life of the lens group.

Optionally, in some embodiments, the lower surface of display screen to imaging surface distance (Total TraceLength, TTL) meet preset relation between the focal length f of the lens group, such as meet 0.1 < f/TTL < 0.2.Meet lens group at When as demand, the miniaturization of the lens group is maintained, the freedom degree that the lens group is assembled in the electronic device is promoted.

Optionally, in some embodiments, the maximum image height Y ' on the imaging surface of the lens group, display screen lower surface arrive Also meet preset relation between the distance TTL of imaging surface and the focal length f of the lens group, for example, meet 0.45 < Y '/(f*TTL) < 0.6.Since the size of TTL determines the size of the focal length f of the lens group, the size of the size of the lens group in other words, therefore By meeting preset relation between control Y', f and TTL three, enable to the lens group with shorter focal length and larger FOV While, maximally utilise effective photosensitive area of optical fingerprint sensor, the i.e. area of induction arrays, thus promoted at As resolution ratio.

Optionally, in some embodiments, the refractive index of the material of first lens and abbe number also meet default pass System, for example, first lens material direct projection rate n₁> 1.54, the abbe number v of the material of first lens₁> 55.50.Out In meet dispersion requirement and reduce production cost the considerations of, such configuration can provide suitable difference balance.

Optionally, in some embodiments, the refractive index of the material of second lens and abbe number also meet default pass System, for example, second lens material refractive index n₂> 1.54, the abbe number v of the material of second lens₂> 55.98.Out In meet dispersion requirement and reduce production cost the considerations of, such configuration can provide suitable difference balance.

In the embodiment of the present application, when the parameter of the lens group meets the first relationship, in addition to FOV can be made to be greater than the first threshold Value can also be such that the parameter such as F number, TV distortion, relative illumination of the lens group is in suitable range.For example, the mirror The F number of head group enables to enough light to enter lens group, is conducive to acquire faint fingerprint signal, together less than 1.5 When can also shorten the time for exposure, reduce power consumption.In another example the TV of the lens group distorts less than 5%, be conducive to evade More's item Influence of the line to fingerprint imaging.In another example the relative illumination of the lens group is greater than 30%, be conducive to promote image quality.

Optionally, in some embodiments, which further includes diaphragm (or being referred to as aperture), which sets It is placed between first camera lens and second camera lens.

The diaphragm can be used for adjusting the size of optical signal or areas imaging, by setting diaphragm to optical signal or imaging model It encloses and is adjusted, so that the optical signal for carrying finger print information is farthest imaged in optical fingerprint sensor, so that the light More finger print informations can be obtained by learning fingerprint sensor, further promote the parsing power of fingerprint recognition.

Optionally, in some embodiments, can by control each structural member in the lens group (such as first thoroughly Mirror, the second lens, diaphragm) the physical parameters such as radius of curvature, thickness, material, effective diameter and circular cone coefficient, and/or, the mirror The aspherical high-order coefficient (such as even order terms in A2~A16 etc.) of non-spherical lens in head group, makes the ginseng of the lens group Number meets the first above-mentioned relationship, so that the FOV of the lens group is greater than 100 degree, the TV of the lens group distorts less than 5%, The relative illumination of the lens group is greater than 30%, and the F number of the lens group is described in detail less than 1.5 below in conjunction with specific embodiment.

It should be understood that the lens group of the embodiment of the present application can be applied in optical fingerprint identification device, which can be with Cooperate with the optical fingerprint sensor in the optical fingerprint identification device, realizes in a limited space to larger fingerprint collecting area The imaging of the finger print information in domain；Alternatively, the lens group can also be applied at other to the higher equipment of optical imagery performance requirement Or in device, it is not construed as limiting here.

Fig. 4 is the structural schematic diagram using the optical fingerprint identification device of the lens group of the embodiment of the present application.Such as Fig. 4 institute Show, which may include: 401, IR infrared fileter (Infrared Filter, IR Filter) Optical filter joint adhesive 402, chip (DIE) 403, DIE joint adhesive 404, flexible circuit board (Flexible Printed Circuit, FPC) 405, stiffening plate 406, bracket 407 and lens group 409.

Wherein, which is used for filtering infrared light, influences fingerprint imaging to avoid infrared light；

IR optical filter joint adhesive 402 is for being bonded the IR optical filter 401 and DIE403；

DIE 403 can be optical imagery chip etc., can correspond specifically to the light detecting portion 134 in Fig. 1, use In converting optical signals to electric signal to get the fingerprint image of finger above optical fingerprint identification device；DIE 403 It can be used cooperatively with lens group 409, the optical signal being imaged through the lens group 409 is converted into electric signal；

DIE joint adhesive 404, for fixing DIE 403 and FPC 405.

FPC405, for connecting the circuit in the electronic equipment that the DIE403 and the optical fingerprint identification device are installed；

Bracket 407, for fixing the lens group 409 and DIE 403, to control defocus and eccentric precision.

The top of the optical fingerprint identification device 400 is additionally provided with screen assembly, the screen assembly include display screen 410, Foam 411 and copper foil 412.

In the embodiment of the present application, which can be with elastic conjunction in the bracket 407, so that the lens group 409 It fits together with DIE 403, each structural member of the optical fingerprint identification device can be combined by gluing, further The optical fingerprint identification device can be fixed in the center 408 of electronic equipment.

Due to needing to carry out the transmitting of optical signal between lens group 409 and display screen 410, the lens group 409 pair Foam 411 and aluminium foil 412 in the screen assembly answered need aperture, so that the optical signal energy within the scope of the FOV of the lens group 409 Enough pass through.

Hereinafter, 1, embodiment 2 and embodiment 3 in conjunction with the embodiments, illustrate according to the lens group of the embodiment of the present application Performance.

Embodiment 1

Lens group includes that two lens (the first lens and the second lens) and diaphragm, Fig. 5 show the layout of the lens group (layout), wherein be disposed with from the object side to the image side: display screen, the first lens, diaphragm, the second lens, IR optical filter, Optical filter joint adhesive.First lens are concavees lens, which is convex lens.

For according to sequence from the object side to the image side, the upper and lower surface of display screen is denoted as S1 respectively convenient for distinguishing and describing And S2, two surfaces of the first camera lens are denoted as S3 and S4 respectively, the surface of diaphragm is denoted as S5, two surfaces difference of the second camera lens It is denoted as S6 and S7, the surface of IR optical filter is denoted as S8 and S9 respectively, and the surface of optical filter joint adhesive is denoted as S10 and S11, imaging surface For S12.

Further, pass through the radius of curvature in each face being arranged in the lens group, thickness, material, effective diameter, circular cone In coefficient at least one of, and/or, aspherical high-order coefficient A2, A4 of the non-spherical lens in the lens group, A6, A8, A10, A12, A14, A16, so that the parameter of the lens group meets above-mentioned first relationship, so that the FOV of the lens group is greater than 100 degree, TV distortion less than 5%, F number less than 1.5 and relative illumination be greater than 30%.

In embodiment 1, the first relationship and other preset relations that the parameter of the lens group meets 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 radius of curvature in each face in the S1~S12, thickness, material, effectively can be set Diameter, circular cone coefficient use corresponding parameter in table 1, and the aspherical aspherical high-order coefficient in S1~S12 uses 2 institute of table The parameter shown.

Table 1

Surface	Surface type	Radius of curvature	Thickness	Material	Effective diameter	Circular cone coefficient
							S1	Object plane	It is infinite	1.500	BK7	2.800
S2	Spherical surface	It is infinite	0.730		1.888
							S3	It is aspherical	-0.917	0.369	APL5014CL	0.780	-0.793
S4	It is aspherical	-3.314	0.209		0.334	-449.4978
							S5	Diaphragm face	It is infinite	0.029		0.198
S6	It is aspherical	1.105	0.383	APL5014CL	0.230	-12.050
							S7	It is aspherical	-0.318	0.428		0.300	-0.152
S8	Spherical surface	It is infinite	0.21	D263TECO	0.714
							S9	Spherical surface	It is infinite	0.020	BK7	0.714
S12	Image planes				0.619

It should be noted that S9 and S10 may be considered same surface, and S11 and S12 can consider in the embodiment 1 It is same surface, i.e. S10 and S9 correspond to same parameter, and the parameter of S12 and S11 correspond to same parameter, therefore S10 and S11 pairs The parameter answered is not shown.

Table 2

Surface

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 parameter shown in Tables 1 and 2, it can determine that the parameter of lens group shown in embodiment 1 is as follows: TTL= 2.37666mm (i.e. the distance of S2 to S12), f₁=-2.4486, f₂=0.49849, f=0.444242mm, R1=-0.917, R2 =-3.314, R3=1.105, R4=-0.318, Y '=0.61.Wherein, f₁/ R1=2.670229, f₁/ R2=0.738865, f₂/ 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=v₂=55.9867.As can be seen that the parameter of the lens group is all satisfied aforementioned One relationship and other aforementioned preset relations.Under the above parameters, Fig. 6 to Fig. 8 is followed successively by relative illumination figure, the astigmatism of the lens group Figure, TV distortion figure and modulation transfer function (Modulation Transfer Function, MFT) figure.

From Fig. 6 to analogous diagram shown in Fig. 8, it can be concluded that, the FOV of the lens group is 105 degree, and work F number is 1.47156, TV distortion is 0.3268%, relative illumination 30%.Therefore, the case where the parameter of lens group meets the first relationship above-mentioned Under, small and high relative illumination performance that the lens group is big with FOV, work F number is small, TV distorts.

Embodiment 2

Lens group includes that two lens (the first lens and the second lens) and diaphragm, Fig. 9 show the layout of the lens group (layout), wherein be disposed with from the object side to the image side: display screen, the first lens, diaphragm, the second lens, IR optical filter, Optical filter joint adhesive.First lens are concavees lens, which is convex lens.

In example 2, the first relationship and other preset relations that the parameter of the lens group meets 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 example 2, the radius of curvature in each face in the S1~S12, thickness, material, effectively can be set Diameter, circular cone coefficient use corresponding parameter in table 3, and the aspherical aspherical high-order coefficient in S1~S12 uses 4 institute of table The parameter shown.

Table 3

Surface	Surface type	Radius of curvature	Thickness	Material	Effective diameter	Circular cone coefficient
							S1	Object plane	It is infinite	1.5	BK7	2.800
S2	Spherical surface	It is infinite	1.030		2.054
							S3	It is aspherical	-0.765	0.352	APL5015AL	0.741	-2.086
S4	It is aspherical	-1.646	0.198		0.328	-473.887
							S5	Diaphragm face	It is infinite	0.014		0.189
S6	It is aspherical	1.081	0.345	APL5014CL	0.234	2.872
							S7	It is aspherical	-0.288	0.372		0.303	-0.287
S8	Spherical surface	It is infinite	0.21	D263TECO	0.450
							S9	Spherical surface	It is infinite	0.02	BK7	0.553
S12	Image planes				0.537

It should be noted that S9 and S10 may be considered same surface, and S11 and S12 can consider in the embodiment 2 It is same surface, i.e. S10 and S9 correspond to same parameter, and the parameter of S12 and S11 correspond to same parameter, therefore S10 and S11 pairs The parameter answered is not shown.

Table 4

Surface

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 parameter shown in table 3 and table 4, it can determine that the parameter of lens group shown in embodiment 2 is as follows: TTL= 2.3775mm (i.e. the distance of S2 to S12), f₁=-3.3167, f₂=0.47697, f=0.447816mm, R1=-0.765, R2 =-1.646, R3=1.081, R4=-0.288, Y '=0.58.Wherein, f₁/ R1=3.042844, f₁/ R2=1.104462, f₂/ 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=v₂=55.9867.As can be seen that the parameter of the lens group be all satisfied the first relationship above-mentioned and Other aforementioned preset relations.Under the above parameters, Figure 10 to Figure 12 is followed successively by relative illumination figure, astigmatism figure, the TV of the lens group Distortion figure and MFT figure.

Analogous diagram shown in from Figure 10 to Figure 12 it can be concluded that, the FOV of the lens group is 110 degree, and the F number that works is 1.46254, TV distortion are 0.0603%, relative illumination 30%.Therefore, meet the first relationship above-mentioned in the parameter of lens group In the case where, small and high relative illumination performance that the lens group is big with FOV, work F number is small, TV distorts.

Embodiment 3

Lens group includes that two lens (the first lens and the second lens) and diaphragm, Figure 13 show the layout of the lens group (layout), wherein be disposed with from the object side to the image side: display screen, the first lens, diaphragm, the second lens, IR optical filter, Optical filter joint adhesive.First lens are concavees lens, which is convex lens.

In embodiment 3, the first relationship and other preset relations that the parameter of the lens group meets 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 radius of curvature in each face in the S1~S12, thickness, material, effectively can be set Diameter, circular cone coefficient use corresponding parameter in table 5, and the aspherical aspherical high-order coefficient in S1~S12 uses 6 institute of table The parameter shown.

Table 5

It should be noted that S9 and S10 may be considered same surface, and S11 and S12 can consider in the embodiment 3 It is same surface, i.e. S10 and S9 correspond to same parameter, and the parameter of S12 and S11 correspond to same parameter, therefore S10 and S11 pairs The parameter answered is not shown.

Table 6

Surface

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 parameter shown in table 5 and table 6, it can determine that the parameter of lens group shown in embodiment 3 is as follows: TTL= 2.54mm (i.e. the distance of S2 to S12), f₁=-3.0433mm, f₂=0.4557mm, f=0.397686mm, R1=-1.090, R2 =-3.003, R3=2.124, R4=-0.280, Y '=0.501.Wherein, f₁/ R1=3.97817, f₁/ R2=1.848906, f₂/ 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=v₂=55.9867.As can be seen that the parameter of the lens group be all satisfied it is above-mentioned First relationship and other aforementioned preset relations.Under the above parameters, Figure 14 to Figure 16 be followed successively by the lens group relative illumination figure, Astigmatism figure, TV distortion figure and MFT figure.

Analogous diagram shown in from Figure 14 to Figure 16 it can be concluded that, the FOV of the lens group is 105 degree, and the F number that works is 1.41653, TV distortion are 1.32%, relative illumination 30%.Therefore, meet the first relationship above-mentioned in the parameter of lens group In the case of, small and high relative illumination performance that the lens group is big with FOV, work F number is small, TV distorts.

It should be understood that position corresponding to parameter of the table 1 into table 6 is blank, then it represents that the value without this parameter or the parameter It is 0.For example, the blank space in one column of material can indicate air；In another example blank indicates to be somebody's turn to do at aspherical high-order coefficient A2 Coefficient is 0.

To sum up, the lens group of the embodiment of the present application provides a kind of wide-angle short-focus lens group, can be adopted using the lens group Collect the finger print information in bigger region, and short focus design enables the lens group to be preferably applied to the limited electricity of longitudinal space In sub- equipment, the applicability of the lens group is enhanced.

Figure 17 is according to the schematic block diagram of the fingerprint identification device of the embodiment of the present application, and as shown in figure 17, which knows Other device 1700 includes lens system 1710, which may include a lens group, or including two camera lenses Group is with the area in further expansion fingerprint collecting region.Wherein, each lens group can be for example the camera lens in previous embodiment Group 30.

When in the fingerprint identification device 1700 including two lens groups, the two lens groups are radially set side by side It sets, such as can be arranged according to mode shown in Figure 18, further to expand field range, and reduce the total of lens system Length, thus when reducing assembly occupied fingerprint identification device 1700 longitudinal space.

Fingerprint identification device in the embodiment of the present application is due to having used above-mentioned lens group, and by filling in fingerprint recognition The lens group of interior setting two side by side is set, expansion fingerprint collecting region area is efficiently solved and reduction lens system is long Contradiction between degree.Allow the total length of lens system to be less than 2.6mm, and the field range of 4 × 7mm may be implemented, That is the fingerprint collecting region of the fingerprint identification device can achieve 4 × 7mm, so as to obtain more fingerprints of user's finger Information, improves the reliability of fingerprint detection, and promotes experience when user carries out fingerprint detection.

Optionally, which may include DIE shown in such as Fig. 4 of optical fingerprint sensor 1720 403, the lower section of the lens system 1710 is set, for receiving the optical signal after the lens system 1710 transmission, and it is right The optical signal is handled, to obtain the finger print information for including in the optical signal.

Optionally, which may include an optical fingerprint sensor, the optical fingerprint sensor 1720 may include two induction arrays, and the corresponding lens group of each induction arrays, each lens group corresponds to fingerprint collecting area A sub-regions in domain, each lens group are used for the optical signal in its corresponding subregion, guidance to lens group lower section Corresponding induction arrays.Alternatively, may include two optical fingerprint sensors in the fingerprint identification device 1700, two light It learns fingerprint sensor and corresponds respectively to two lens group, wherein each lens group is used for subregion corresponding to the lens group Interior optical signal is guided to its corresponding optical fingerprint sensor, and is acquired by the induction arrays on the optical fingerprint sensor.

Optionally, which can correspond to optical fingerprint identification device 400 shown in Fig. 4, this refers to Line identification device 1700 can also include the structure in optical fingerprint identification device 400, such as IR optical filter 301, bracket 407 Deng not repeating here.

It should be understood that Figure 18 is only a schematical diagram.In the concrete realization, above-mentioned two camera lens arranged side by side Group can be set below the same display screen, as shown in figure 20, imaging region of above-mentioned two lens group in the display screen It is formed in the fingerprint collecting region of display screen, and two imaging regions can have certain crossover region.On the other hand, above-mentioned two Optical fingerprint sensor (or optical fingerprint sensor chip, optical imagery chip, image sensor chip below a lens group Deng) can respectively corresponding setting, there are two induction arrays, and filter plate or IR optical filtering are covered with above this two induction arrays Piece.Based on above structure, the fingerprint collecting range of described two induction arrays can correspond respectively to two of above-mentioned lens group Imaging region, described two induction arrays detect pressing in the fingerprint image in the fingerprint collecting region of the display screen respectively A part of (referred to as subgraph), and the crossover region acquired image can be collected to two imaging regions for carrying out Subgraph carries out splicing to get the fingerprint image of larger area.

It should be understood that the embodiment of the present application is only described so that fingerprint identification device includes one or two lens group as an example, It is also possible to include more lens groups, here without limitation.

The embodiment of the present application also provides a kind of electronic equipment, and as shown in figure 19, which knows including fingerprint Other device 1910, the fingerprint identification device 1910 can be real shown in the fingerprint identification device 1700 or Fig. 4 in previous embodiment Apply the optical fingerprint identification device 400 in example.

Optionally, which can also include screen assembly 1920, including display screen, foam and copper foil, be set to The top of lens system in the fingerprint identification device 1910；Wherein, above the lens system the corresponding foam and The regional opening of the copper foil, so that the optical signal including finger print information is able to enter the lens system.

Non-limiting as example, the electronic equipment 1900 can be terminal device, mobile phone, tablet computer, notebook Computer, desktop computer, vehicle electronic device or wearable intelligent equipment etc., the wearable intelligent equipment include that function is complete, ruler It is very little it is big, smart phone can not depended on realize complete or partial function, such as: smartwatch or intelligent glasses etc., and only It is absorbed in certain a kind of application function, needs to be used cooperatively with other equipment such as smart phone, such as the intelligence of all kinds of carry out sign monitorings The equipment such as energy bracelet, intelligent jewellery.

It should be understood that the specific example in the embodiment of the present application is intended merely to that those skilled in the art is helped to more fully understand The embodiment of the present application, rather than the range of the embodiment of the present application is limited, those skilled in the art can be on the basis of above-described embodiment It is upper to carry out various improvement and deformations, and these are improved or deformation is all fallen in the protection scope of the application.

The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any Those familiar with the art within the technical scope of the present application, can easily think of the change or the replacement, and should all contain Lid is within the scope of protection of this application.Therefore, the protection scope of the application should be based on the protection scope of the described claims.

Claims

1. a kind of lens group, which is characterized in that including the first camera lens and the second camera lens set gradually from the object side to the image side, In:

First camera lens includes the first lens of negative power, and first lens are the S-shaped bent moon eyeglass that object side is convex surface, It is aspherical for having at least one face in two faces of first lens；

Second camera lens includes the second lens of positive light coke, and second lens are biconvex eyeglass, second lens Two faces in have at least one face be it is aspherical；

Wherein, the parameter of the lens group meets the first relationship, so that the field angle FOV of the lens group is greater than first threshold, And the length of the lens group is made to be less than second threshold,

Wherein, the parameter of the lens group includes at least two in following: the focal length f of the lens group, first lens Focal length f₁, second lens focal length f₂, first lens towards object side one side radius of curvature R 1, described first Lens towards image side radius of curvature R 2, second lens towards object side while radius of curvature R 3 and described The radius of curvature R 4 towards image side one side of two lens.

2. lens group according to claim 1, which is characterized in that first relationship includes: 2.5 < f₁/ R1 < 4 and/or 0.5<f₁/R2<2.0。

3. lens group according to claim 1 or 2, which is characterized in that first relationship further include: 0.2 < f₂/R3<0.5 And/or -2 < f₂/R4<-1。

4. lens group according to any one of claim 1 to 3, which is characterized in that first relationship further includes following At least one of: -1 < f/f₁<0、0<f/f₂<1、-8<f₁/f₂<-4。

5. lens group according to any one of claim 1 to 4, which is characterized in that first relationship further includes following 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. lens group according to any one of claim 1 to 5, which is characterized in that the first threshold is 100 degree.

7. lens group according to any one of claim 1 to 6, which is characterized in that the second threshold is 2.6 millimeters.

8. lens group according to any one of claim 1 to 7, which is characterized in that first lens are along optical axis direction Thickness CT1 and second lens meet between the thickness CT2 of optical axis direction: 0.5 < CT1/CT2 < 1.5.

9. lens group according to any one of claim 1 to 8, which is characterized in that the lower surface of display screen to imaging surface Distance TTL and the lens group focal length f between meet: 0.1 < f/TTL < 0.2.

10. lens group according to any one of claim 1 to 9, which is characterized in that on the imaging surface of the lens group Maximum image height Y ', display screen lower surface to imaging surface distance TTL and the lens group focal length f between meet: 0.45 < Y’/(f*TTL)<0.6。

11. lens group according to any one of claim 1 to 10, which is characterized in that the material of first lens Refractive index n₁> 1.54, the abbe number v of the material of first lens₁> 55.50.

12. lens group according to any one of claim 1 to 11, which is characterized in that the material of second lens Refractive index n₂> 1.54, the abbe number v of the material of second lens₂> 55.98.

13. lens group according to any one of claim 1 to 12, which is characterized in that the lens group further include:

Diaphragm is set between first camera lens and second camera lens.

14. lens group according to any one of claim 1 to 13, which is characterized in that the TV distortion of the lens group is small In 5% and/or the lens group relative illumination be greater than 30% and/or the lens group F number less than 1.5.

15. a kind of fingerprint identification device, which is characterized in that including lens system, the lens system includes that a such as right is wanted Lens group described in asking any one of 1 to 14, or including two lens groups radially arranged side by side.

16. fingerprint identification device according to claim 15, which is characterized in that the fingerprint identification device further include:

Optical fingerprint sensor is set to the lower section of the lens system, for receiving the light after lens system transmission Signal, and the optical signal is handled, to obtain the finger print information carried in the optical signal.

17. fingerprint identification device according to claim 15 or 16, which is characterized in that the finger of the optical fingerprint sensor The area of line pickup area is greater than 4mm × 7mm.

18. fingerprint identification device described in any one of 5 to 17 according to claim 1, which is characterized in that the fingerprint recognition dress It sets further include: bracket；

Wherein, the lens system elastic conjunction is in the bracket.

19. a kind of electronic equipment characterized by comprising the fingerprint recognition dress as described in any one of claim 15 to 18 It sets.

20. electronic equipment according to claim 19, which is characterized in that the electronic equipment further include:

Screen assembly, including display screen, foam and copper foil, are set to the top of the lens system in the fingerprint identification device；

Wherein, the regional opening of the lens system the top corresponding foam and the copper foil, so as to include finger print information Optical signal enter the lens system.