CN208569169U - Lens system, fingerprint identification device and terminal device - Google Patents
Lens system, fingerprint identification device and terminal device Download PDFInfo
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- CN208569169U CN208569169U CN201821359091.8U CN201821359091U CN208569169U CN 208569169 U CN208569169 U CN 208569169U CN 201821359091 U CN201821359091 U CN 201821359091U CN 208569169 U CN208569169 U CN 208569169U
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Abstract
A kind of lens system, fingerprint identification device and terminal device, it include: the first camera lens and the second camera lens set gradually from the object side to the image side, wherein: first camera lens is the S-shaped bent moon eyeglass of negative power, second camera lens is the biconvex eyeglass of positive light coke, the focal length of first camera lens and second camera lens meets the first relationship, so that the field angle FOV of the lens system is greater than first threshold.
Description
Technical field
The invention relates to optical imaging fields, and more particularly, to lens system, fingerprint identification device and
Terminal device.
Background technique
With the development of fingerprint Identification sensor, shield lower fingerprint identification technology due to the physical bit that is not take up on electronic equipment
It sets, becomes a kind of technological trend, fingerprint technique is based on light and collimates principle under current screen, and the resolution ratio of optical finger print mould group is by light
The distribution period and depth-to-width ratio of collimation unit determine, if optical finger print mould group it is size-constrained if, the solution of usual fingerprint recognition
It is lower to analyse power, influences the accuracy rate and safety of fingerprint recognition.
Utility model content
The application provides a kind of lens system, fingerprint identification device and terminal device, can fingerprint mould group size by
In the case where limit, realizes the acquisition to large range of finger print information, the parsing power of fingerprint recognition is able to ascend, so as to mention
Rise the accuracy rate and safety of fingerprint recognition.
In a first aspect, providing a kind of lens system, comprising: the first camera lens set gradually from the object side to the image side and second
Camera lens, in which:
First camera lens is the S-shaped bent moon eyeglass of negative power, and second camera lens is the biconvex mirror of positive light coke
The focal length of piece, first camera lens and second camera lens meets the first relationship, so that the field angle FOV of the lens system is big
In first threshold.
Therefore, the lens system of the embodiment of the present application passes through the camera lens for being laid out different focal powers, and passes through setting camera lens
The parameter of system meets the first relationship, so that the characteristic that lens system has FOV big, uses the lens system so as to be promoted
Optical finger print identification mould group fingerprint recognition performance.
In some possible implementations, first relationship are as follows: -2.6 < f1/f2< -1.6, wherein f1It is described
The focal length of one camera lens, f2For the focal length of second camera lens.
In some possible implementations, the first threshold is 100 degree.
In some possible implementations, maximum image height Y', focal length f on the imaging surface of the lens system and from aobvious
The distance TTL of the lower surface of display screen to imaging surface meets the second relationship, so that the focal length of the lens system is less than second threshold.
In some possible implementations, second relationship are as follows: 0.2 < Y'/(f*TTL) < 0.6.
In some possible implementations, the lens system further include:
Diaphragm is set between first camera lens and second camera lens.
In some possible implementations, at least one face in the lens system is aspherical.
In some possible implementations, the TV of the lens system distorts less than 5%, the lens system it is opposite
Illumination is greater than 60%, and the F number of the lens system is less than 1.6.
In some optional implementations, radius of curvature, the thickness in each face being arranged in the lens system can be passed through
Degree, material, effective diameter, in circular cone coefficient at least one of and/or the non-spherical lens in the lens system aspherical height
Secondary term coefficient, for example, A2, A4, A6, A8, A10, A12, A14, A16, so that the parameter of the lens system meets first relationship
With second relationship, so that the FOV of the lens system is greater than 100 °, TV distortion is less than 5%, F number less than 1.6, Yi Jixiang
60% is greater than to illumination.
Second aspect provides a kind of fingerprint identification device, comprising:
Such as the lens system in any possible implementation of first aspect or first aspect.
In one possible implementation, the fingerprint identification device further include:
Imaging 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 for including in the optical signal.
In one possible implementation, the fingerprint identification device further include: bracket,
Wherein, the lens system elastic conjunction is in the bracket.
The third aspect provides a kind of terminal device, comprising:
Such as the lens system in any possible implementation of first aspect or first aspect.
In one possible implementation, the terminal device further include:
Screen assembly, including display screen, foam and copper foil, are set to the upper of the lens system in the fingerprint identification device
Side；
Wherein, the regional opening of the lens system the top corresponding foam and the copper foil, so as to include fingerprint
The optical signal of information enters the lens system.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the terminal device that the embodiment of the present application is applicable in.
Fig. 2 is according to the structural schematic diagram of the lens system of the embodiment of the present application.
Fig. 3 identifies the structural schematic diagram of mould group according to the optical finger print of the embodiment of the present application.
Fig. 4 is the schematic diagram according to a kind of layout of the lens system of the embodiment of the present application.
Fig. 5 is the relative illumination figure of the lens system of layout shown in Fig. 4.
Fig. 6 is the astigmatism figure of the lens system of layout shown in Fig. 4.
Fig. 7 is the TV distortion figure of the lens system of layout shown in Fig. 4.
Fig. 8 is the MTF figure of the lens system of layout shown in Fig. 4.
Fig. 9 is the schematic diagram according to another layout of the lens system of the embodiment of the present application.
Figure 10 is the relative illumination figure of the lens system of layout shown in Fig. 9.
Figure 11 is the astigmatism figure of the lens system of layout shown in Fig. 9.
Figure 12 is the TV distortion figure of the lens system of layout shown in Fig. 9.
Figure 13 is the MTF figure of the lens system of layout shown in Fig. 9.
Figure 14 is the structural schematic diagram according to the fingerprint identification device of the embodiment of the present application.
Figure 15 is the schematic block diagram according to the terminal device of the embodiment of the present application.
Specific embodiment
Below in conjunction with attached drawing, the technical solution in the application is described.
It should be understood that the embodiment of the present application can be applied to optical fingerprint systems, including but not limited to optical finger print identification system
System and the medical diagnostic products being imaged based on optical finger print, the embodiment of the present application are only illustrated by taking optical fingerprint systems as an example,
But any restriction should not be constituted to the embodiment of the present application, the embodiment of the present application is equally applicable to other using optical image technology
System etc..
It should also be understood that the technical solution of the embodiment of the present application other than it can carry out fingerprint recognition, can also carry out other
Living things feature recognition, for example, vivo identification etc., the embodiment of the present application does not also limit this.
As a kind of common application scenarios, optical fingerprint systems provided by the embodiments of the present application can be applied in intelligent hand
Machine, tablet computer and other with the mobile terminal of display screen or other terminal devices；More specifically, being set in above-mentioned terminal
In standby, fingerprint acquisition device can be specially optical finger print device, can be set regional area below display screen or
Whole region, to form (Under-display) optical fingerprint systems under screen.
The structural schematic diagram for the terminal device that can be applicable in for the embodiment of the present application as shown in Figure 1, the terminal device 700
Including display screen 720 and optical finger print device 730, wherein the optical finger print device 730 is arranged under the display screen 720
The regional area of side.The optical finger print device 730 includes the induction arrays with multiple optical sensor units, the induction battle array
Arrange the fingerprint detection region 703 that region is the optical finger print device 730.As shown in Figure 1, the fingerprint detection region
703 are located among the display area 702 of the display screen 720, and therefore, user is needing to be unlocked the terminal device
Or when other fingerprint authentications, it is only necessary to finger is pressed in the fingerprint detection region 703 for being located at the display screen 720,
It can realize that fingerprint inputs.Since fingerprint detection can be realized in screen, 700 nothing of terminal device using the above structure
Need the special reserved space in its front that fingerprint key (such as Home key) is set.
In embodiment as one preferred, the display screen 720 can be using the display with spontaneous light display unit
Screen, such as Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) display screen or miniature luminous two
Pole pipe (Micro-LED) display screen.For using OLED display screen, the optical finger print device 730 can use described
OLED display screen 720 is located at the display unit (i.e. OLED light source) in the fingerprint detection region 703 as optical finger print detection
Excitation light source.Also, the induction arrays of the optical finger print device 730 are specially optical detector (Photo detector) battle array
Column comprising multiple optical detectors in array distribution, the optical detector can be used as optical sensor list as described above
Member.When the light that finger pressing is at the fingerprint detection region 703, and the display unit in the fingerprint detection region 703 issues
Occur to reflect and formed reflected light in the fingerprint of finger surface, wherein the ridge of the finger print and the reflected light of paddy are different
, reflected light from the display screen 720 and is received and converted to corresponding electric signal, i.e. fingerprint by the photodetector array
Detect signal；Fingerprint image data can be obtained based on the fingerprint detection signal, and can be with further progress fingerprint
With verifying, to realize optical finger print identification function in the terminal device 700.
It should be understood that the terminal device 700 further includes transparency protected cover board 710, the lid in specific implementation
Plate 710 can be glass cover-plate or sapphire cover board, be located at the top of the display screen 720 and cover the terminal device
700 front.Because in the embodiment of the present application, so-called finger pressing actually refers to pressing in institute in the display screen 720
State the cover board 710 of 720 top of display screen or the protective layer of the covering cover board 710.
As a kind of optional implementation, as shown in Figure 1, the optical finger print device 730 includes light detecting portion 734
With optical module 732, the light detecting portion 734 includes the induction arrays and the reading being electrically connected with the induction arrays
Circuit and other auxiliary circuits can be produced on a chip (Die) by semiconductor technology；The optical module 732
It can be set in the top of the induction arrays of the light detecting portion 134, filter layer (Filter), leaded light can be specifically included
Layer and other optical elements, the filter layer can be used for filtering out the environment light for penetrating finger, and the optical waveguide layer is mainly used
Optical detection is carried out in being directed to the induction arrays from the reflected reflected light of finger surface.
In specific implementation, the optical module 732 can be encapsulated in the same optics with the light detecting portion 134 and refer to
Line chip.Wherein, the optical waveguide layer can be specially lens (Lens) layer being made in semi-conductor silicon chip, with multiple
Lens unit from the reflected reflected light of finger through the lens unit, and is received by optical sensor unit below, according to
This, the induction arrays can detecte out the fingerprint image of finger.
In the optical finger print device 730, each lens unit can respectively correspond the induction arrays wherein
One optical sensor unit；Alternatively, the lens unit is with can also be between the optical sensor unit of the induction arrays
Reduced using non-one-to-one relationship generate Moire fringe interference, such as an optical sensor unit can correspond to it is multiple
Lens unit, alternatively, the lens unit can also be by the way of irregular alignment；Using the lens unit of irregular alignment
It can be corrected by later period software algorithm come the reflection light detected to each sensing unit.
In other substitution implementations, the display screen 720 can also use the display screen of non-spontaneous light, for example use
The liquid crystal display of backlight；In this case, the optical detection apparatus 730 just can not be using the aobvious of the display screen 720
Show unit as excitation light source, it is therefore desirable to be internally integrated excitation light source in the optical detection apparatus 730 or outside it
Setting motivates light source to realize that optical finger print detects, and testing principle is consistent with content is described above.
It should be understood that in the embodiment of the present application, the induction arrays in the optical finger print device are referred to as image sensing
Device (Sensor) or photoelectric sensor can be fabricated to a DIE through semiconductor technology working process, i.e. DIE includes that image passes
Sensor.
It should also be understood that the optical finger print device in the embodiment of the present application is referred to as optical finger print identification mould group, fingerprint
Identification device, fingerprint recognition mould group, fingerprint mould group, fingerprint acquisition device etc..
To introduce the performance indicator of camera lens first convenient for better understanding the embodiment of the present application.
Field angle (Field Of View, FOV), characterizes the field range of camera lens, in the case where Lens are equal,
The FOV of camera lens is bigger, indicates that the camera lens can obtain the information in bigger region, i.e., the letter that can be obtained using the big camera lens of the FOV
Breath amount is bigger.
F number, for characterize penetrate camera lens enter optical finger print device induction arrays amount light, F number is smaller, indicate into
The amount light for entering camera lens is more.
TV distortion, for measuring the visual distortion degree of image, it will be understood that TV distortion is smaller, and imaging effect is better.
Relative illumination can refer to the ratio between illumination and illumination of central point of the different coordinate points on imaging surface, relative illumination
The problem of smaller, the illumination of imaging surface is more uneven, is easy to produce under-exposed certain positions or center overexposure, influences to be imaged
Quality, i.e. relative illumination are bigger, and image quality is higher.
Fig. 2 is according to the schematic diagram of the lens system of the embodiment of the present application, as shown in Fig. 2, the lens system 10
It include: the first camera lens 11 and the second camera lens 12 set gradually from the object side to the image side, wherein first camera lens 11 is negative light focus
The S-shaped bent moon eyeglass of degree, second camera lens 12 are the biconvex eyeglass of positive light coke.
Specifically, first camera lens is the S-shaped bent moon eyeglass of negative power, and second camera lens is the double of positive light coke
Convex surface eyeglass, that is, first camera lens 11 can be concavees lens, which can be convex lens.
It it should be understood that in the embodiment of the present application, which can be a concavees lens, or may be one group saturating
Mirror, as long as the combination focal power of one group of lens is negative power, similarly, which may be a convex lens
Mirror, or may be one group of lens, as long as the combination focal power of one group of lens is positive light coke.
Optionally, in some embodiments, first camera lens and second camera lens can use resin material, or
Other plastic materials, the embodiment of the present application are not construed as limiting this.
Further, the focal length of first camera lens and second camera lens meets the first relationship, so that the camera lens system
The field angle FOV of system is greater than first threshold.
It should be understood that here, the focal length of first camera lens and the second camera lens meets the first relationship, can for first camera lens and
The ratio of the focal length of second camera lens is in a specific range or the ratio of the combined focal length of first camera lens and the lens system
In a specific range, or may be second camera lens and the lens system combined focal length ratio in specific range
Interior etc., the embodiment of the present application is not construed as limiting this.
That is, the embodiment of the present application can pass through the first camera lens of setting, the focal length and the lens system of the second camera lens
Combined focal length at least two meet certain relationship so that the lens system has the big characteristic of FOV, this
Sample can acquire the finger print information in bigger region using the fingerprint recognition mould group of the lens system, and then be able to ascend fingerprint knowledge
Other accuracy and safety.
Optionally, in some embodiments, which can be -2.6 < f1/f2< -1.6, wherein f1It is described
The focal length of one camera lens, f2For the focal length of second camera lens.
That is, the ratio by the way that first camera lens and the second camera lens is arranged is in a specific range, this can be made
The FOV of lens system is larger.
Optionally, in some embodiments, the first threshold is 100 degree.
Therefore, meet first relationship by the way that the parameter of lens system is arranged, so that the FOV of the lens system is greater than
100 degree, in this way, the finger print information in bigger region can be acquired in the identical situation of Lens, be conducive to promote fingerprint knowledge
Other parsing power.
Optionally, in some embodiments, the F number of the lens system enables to enough light to enter less than 1.6
To lens system, be conducive to acquire faint fingerprint signal, while the time for exposure can also be shortened, reduce power consumption.
Optionally, in some embodiments, the TV of the lens system distorts less than 5%, is conducive to evade Moire fringe pair
The influence of fingerprint imaging.
Optionally, in some embodiments, the relative illumination of the lens system is greater than 60%, is conducive to be promoted into image quality
Amount.
Therefore, the lens system of the embodiment of the present application passes through the camera lens for being laid out different focal powers, and passes through setting camera lens
The parameter of system meets the first relationship, so that lens system has, FOV is big, work F number is small, the small and relative illumination of TV distortion
Big performance is conducive to the fingerprint recognition performance for promoting the fingerprint recognition mould group using the lens system.
Optionally, in some embodiments, maximum image height Y', the focal length f on the imaging surface of the lens system and from aobvious
The distance TTL (i.e. optics is always high) of the lower surface of display screen to imaging surface meets the second relationship, so that the focal length of the lens system
Less than second threshold.
It should be understood that the size of TTL determines the size of the focal length of the lens system, alternatively, the size of the lens system
Size, the embodiment of the present application meet the second relationship by controlling Y', f and the TTL, enable to the lens system with larger
FOV while, also there is shorter focal length, so that the lens system can preferably be applied to require size
On terminal device.
It is appreciated that the display screen in the electronic equipment that display screen here can be installed for the lens system, this at
Image planes can be imaging sensor surface, the imaging sensor can correspond to optical finger print identification mould group in DIE, i.e., into
The part of traveling optical signal detection.
Optionally, which can be 5 millimeters or 3 millimeters etc., and the embodiment of the present application is not construed as limiting this, as long as
It can satisfy the size requirement of terminal device.
Optionally, in some embodiments, second relationship are as follows: 0.2 < Y'/(f*TTL) < 0.6.
Optionally, in some embodiments, the lens system further include:
Diaphragm is set between first camera lens and second camera lens.
Specifically, diaphragm can be used for adjusting the size of optical signal or areas imaging, by setting diaphragm to optical signal or
Areas imaging is adjusted, and the optical signal with finger print information can be made utmostly to image in optical finger print identification mould group
Imaging sensor surface, enable the imaging sensor to obtain more finger print informations, fingerprint may further be promoted
The parsing power of identification.
To sum up, the lens system of the embodiment of the present application is a kind of wide-angle short-focus lens, and wide-angle designs so that the lens system
The finger print information in bigger region can be acquired, short focus designs so that the lens system occupies smaller space, thus the camera lens system
System can also meet requirement of the terminal device to size, enhance the camera lens while realizing more preferably fingerprint recognition performance
The applicability of system.
It optionally, in some embodiments, can be by controlling each structural member in the lens system (for example, first
Lens, the second lens, diaphragm) the physical parameters such as radius of curvature, thickness, material, effective diameter and circular cone coefficient, and/or should
The aspherical high-order coefficient (for example, even order terms in A2~A16) of non-spherical lens in lens system, so that the camera lens
The parameter of system meets above-mentioned the first relationship and the second relationship, so that the FOV of the lens system is greater than 100 degree, it is described
The TV of lens system distorts less than 5%, and the relative illumination of the lens system is greater than 60%, and the F number of the lens system is less than
1.6, it is described in detail below in conjunction with specific embodiment.
It should be understood that the lens system of the embodiment of the present application can be applied in optical finger print identification mould group, the lens system
It can identify that the imaging sensor in mould group cooperates, and realizes the fingerprint in a limited space to large area with the optical finger print
The imaging of information；Alternatively, the lens system can also be applied at other to the higher device of optical imagery performance requirement
In, the embodiment of the present application is not construed as limiting this.
Fig. 3 is the structural schematic diagram using the optical finger print identification mould group of the lens system of the embodiment of the present application.Such as Fig. 3 institute
Show, which identifies that mould group 200 may include: 201, IR infrared fileter (Infrared Filter, IR Filter)
Optical filter joint adhesive 202, chip (DIE) 203, DIE joint adhesive 204, flexible circuit board (Flexible Printed
Circuit, FPC) 205, stiffening plate 206, bracket 207 and lens system 209.
Wherein, which is used for filtering infrared light, influences fingerprint imaging to avoid infrared light；
IR optical filter joint adhesive 202 is for being bonded the IR optical filter 201 and DIE203；
DIE203, can be with camera lens for converting optical signals to electric signal corresponding to the light detecting portion 734 in Fig. 1
System 209 is used cooperatively, and the optical signal being imaged through the lens system 209 is converted to electric signal；
DIE joint adhesive 204, for fixing DIE203 and flexible circuit board (Flexible Printed Circuit, FPC)
205。
FPC205, for connecting the circuit in the electronic equipment that the DIE203 is installed with optical finger print identification mould group；
Bracket 207, for fixing the lens system 209 and DIE203, to control defocus and eccentric precision.
The top of optical finger print identification mould group 200 is additionally provided with display screen module, including display screen 320,310 and of foam
Copper foil 300.
In the embodiment of the present application, which can be with elastic conjunction in the bracket 207, so that the camera lens system
209 and DIE203 of system fits together, and each structural member of optical finger print identification mould group can be combined by gluing, into
One step optical finger print identification mould group can be fixed in the center 208 of electronic equipment.
Due to needing to carry out the transmitting of optical signal between lens system 209 and display screen 320, the lens system 209
Foam 310 and aluminium foil 300 in corresponding display screen module need aperture, so that within the scope of the FOV of the lens system 209
Optical signal can pass through.
Hereinafter, in conjunction with the embodiments 1 and embodiment 2, illustrate the performance of the lens system according to the embodiment of the present application.
In embodiment 1 and embodiment 2, which all includes two groups of lens and diaphragm, and Fig. 4 and Fig. 9 are shown respectively
Two kinds of layouts (layout) of the lens system of embodiment 1 and embodiment 2, in this two kinds layouts, from the object side to the image side according to
It is secondary to be provided with display screen 20, the first camera lens 21, diaphragm, the second camera lens 22, IR optical filter, optical filter joint adhesive.
Wherein, first camera lens 21, the second camera lens 22 correspond respectively to the first camera lens 11 described above, the second camera lens
12, i.e. first camera lens 21 is concavees lens, which is convex lens.
According to sequence from the object side to the image side, the upper and lower surface of display screen 20 to be denoted as respectively convenient for distinguishing and describing
S1 and S2, two surfaces of the first camera lens 21 are denoted as S3 and S4 respectively, and the surface of diaphragm is denoted as S5, two tables of the second camera lens 22
Face is denoted as S6 and S7 respectively, and the surface of IR optical filter is denoted as S8 and S9 respectively, the surface of optical filter joint adhesive 26 be denoted as S10 and
S11, imaging surface S12.
Further, pass through the radius of curvature in each face being arranged in the lens system, thickness, material, effective diameter, circle
Bore in coefficient at least one of and/or aspherical high-order coefficient A2, A4 of the non-spherical lens in the lens system, A6,
A8, A10, A12, A14, A16, so that the parameter of the lens system meets above-mentioned first relationship and the second relationship, so that should
The FOV of lens system is greater than 100 degree, and TV distortion is less than 5%, F number less than 1.6 and relative illumination is greater than 60%.
Hereinafter, with first relationship are as follows: -2.6 < f1/f2< -1.6, second relationship are as follows: 0.2 < Y'/(f*TTL) < 0.6 be
Example is illustrated, but the application is not limited to this.
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 | 1.5 | BK7 | 3.5 | |
| S2 | Spherical surface | It is infinite | 1.535 | 2.616 | ||
| S3 | It is aspherical | 2.392 | 0.409 | APL5014CL | 0.721 | 7.713 |
| S4 | It is aspherical | 0.702 | 0.257 | 0.283 | -14.748 | |
| S5 | Diaphragm face | It is infinite | 0 | 0.197 | ||
| S6 | It is aspherical | 0.757 | 0.505 | OKP1 | 0.251 | 3.202 |
| S7 | It is aspherical | -6.110 | 0.463 | 0.287 | -4.11E39 | |
| S8 | Spherical surface | It is infinite | 0.021 | D263TECO | 0.395 | |
| S9 | Spherical surface | It is infinite | 0.020 | BK7 | 0.488 | |
| S12 | Image planes | 0.497 |
It should be understood that the table 1 of the embodiment of the present application corresponding position of parameter into table 6 indicates for blank without this parameter, for example,
Blank at material can indicate air.
It should be noted that in the embodiment 1 and embodiment 2, S9 and S10 may be considered same surface, S11 and
S12 may be considered same surface, i.e. S10 and S9 correspond to same parameter, and the parameter of S12 and S11 correspond to same parameter, therefore
The corresponding parameter of S10 and S11 is not shown.
Table 2
| Surface | A2 | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S3 | -0.79 | 3.23 | -11.043 | 25.473 | -23.280 | -33.485 | 99.840 | -69.249 |
| S4 | -0.326 | 2.010 | 913.950 | -4.803e4 | 1.326e6 | -1.962e7 | 1.494e8 | -4.519e8 |
| S6 | 4.122 | -1.303 | 194.141 | -1.067e4 | 2.906e5 | -4.070e6 | 2.874e7 | -7.583e7 |
| S7 | -1.167 | 1.589 | -19.044 | 41.413 | 7948.506 | -5.395e4 | -2.939e4 | 4.602e5 |
Based on parameter shown in Tables 1 and 2, it can determine that the parameter of lens system shown in embodiment 1 is as follows: TTL=
3.4 (i.e. the distances of S2 to S12), f1=-0.88445, f2=0.822380, f3=0.48554, f=0.40994, f1/f2=-
1.822, Y'/(f*TTL)=0.424, the i.e. parameter of lens system meet the first relationship and the second relationship above-mentioned.In above-mentioned ginseng
Under several, Fig. 5 to Fig. 8 is followed successively by relative illumination figure, astigmatism figure, TV distortion figure and the optical transfer function of the lens system
Modulus value (MTF) figure of (Optical Transfer Function).
From Fig. 5 to analogous diagram shown in Fig. 8, it can be concluded that, the FOV of the lens system is 106 degree, and work F number is
1.5869, TV distortion are -3.036%, relative illumination 78.2%.Therefore, meet above-mentioned first in the parameter of lens system
Small and high relative illumination property that in the case where relationship and the second relationship, the lens system is big with FOV, work F number is small, TV distorts
Energy.
For another example in example 2, the radius of curvature in each face in the S1~S12 can be set, thickness, material, have
Effect diameter, circular cone coefficient use corresponding parameter in table 3, and the aspherical aspherical high-order coefficient in S1~S14 uses table 4
Shown in parameter.
Table 3
| Surface | Surface type | Radius of curvature | Thickness | Material | Effective diameter | Circular cone coefficient |
| S1 | Object plane | It is infinite | 1.5 | BK7 | 3.5 | |
| S2 | Spherical surface | It is infinite | 1.646 | 2.647 | ||
| S3 | It is aspherical | 2.526 | 0.380 | APL5014CL | 0.721 | 9.226 |
| S4 | It is aspherical | 0.702 | 0.311 | 0.304 | -6.892 | |
| S5 | Diaphragm face | It is infinite | 0 | 0.202 | ||
| S6 | It is aspherical | 0.704 | 0.495 | APL5014CL | 0.253 | 2.957 |
| S7 | It is aspherical | -0.845 | 0.452 | 0.291 | -8.793e39 | |
| S8 | Spherical surface | It is infinite | 0.21 | D263TECO | 0.409 | |
| S9 | Spherical surface | It is infinite | 0.02 | BK7 | 0.496 | |
| S12 | Image planes | 0.505 |
Table 4
| Surface | A2 | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S3 | -0.790 | 3.249 | -10.931 | 25.502 | -23.135 | -33.495 | 99.102 | -69.443 |
| S4 | -0.441 | 2.639 | 882.874 | -4.818e4 | 1.328e6 | -1.965e7 | 1.495e8 | -4.557e8 |
| S6 | 0.063 | -1.423 | 191.242 | -1.075e4 | 2.901e5 | -4.064e6 | 2.878e7 | -7.651e7 |
| S7 | -1.369 | 1.718 | -21.031 | 35.880 | 8124.488 | -5.133e4 | -1.185e4 | 4.905e5 |
Based on parameter shown in table 3 and table 4, it can determine that the parameter of lens system shown in embodiment 1 is as follows: TTL=
3.4 (i.e. the distances of S2 to S12), f1=-1.007, f2=0.415, f=0.311, f1/f2=-2.427, Y'/(f*TTL)=
0.468, i.e. the parameter of lens system meets the first relationship and the second relationship above-mentioned.Under the above parameters, Figure 10 to Figure 13 according to
It is secondary to scheme for the relative illumination figure of the lens system, astigmatism figure, TV distortion figure and MTF.
Analogous diagram shown in from Figure 10 to Figure 13 it can be concluded that, the FOV of the lens system is 109 degree, and the F number that works is
1.518, TV distortion are -4.17%, relative illumination 62.5%.Therefore, meet above-mentioned first in the parameter of lens system to close
Small and high relative illumination property that in the case where system and the second relationship, the lens system is big with FOV, work F number is small, TV distorts
Energy.
To sum up, the lens system of the embodiment of the present application provides a kind of wide-angle short-focus lens, can using the lens system
The finger print information in bigger region is acquired, and short focus design enables the lens system to be preferably applied to require size
Terminal device on, enhance the applicability of the lens system.
Figure 14 is according to the schematic block diagram of the fingerprint identification device of the embodiment of the present application, and as shown in figure 14, which knows
Other device 400 may include lens system 401, which can be the lens system 10 in previous embodiment.
Optionally, which may include imaging sensor 402, and the lower section of the lens system 401 is arranged in,
For receiving the optical signal after lens system transmission, and the optical signal is handled, includes to obtain in the optical signal
Finger print information.
It should be understood that the fingerprint identification device 400, which corresponds to optical finger print shown in Fig. 3, identifies mould group 200, the fingerprint recognition
Device 400 can also include the structure in optical finger print identification mould group 200, for example, IR optical filter 201, bracket 207 etc., this
In do not repeat.
The embodiment of the present application also provides a kind of terminal devices, and as shown in figure 15, which includes fingerprint recognition
Device 510, the fingerprint identification device 510 can be the fingerprint identification device 400 or embodiment illustrated in fig. 3 in previous embodiment
In optical finger print identify mould group 200.
Optionally, which can also include screen assembly 520, including display screen, foam and copper foil, be set to institute
State the top of the lens system in fingerprint identification device 510；
Wherein, the regional opening of the lens system the top corresponding foam and the copper foil, so as to include fingerprint
The optical signal of information enters the lens system.
Non-limiting as example, the terminal device 500 can be mobile phone, tablet computer, laptop, desktop computer
Computer, vehicle electronic device or wearable intelligent equipment etc., the wearable intelligent equipment include that function is complete, size is big, can disobey
Smart phone is relied to realize complete or partial function, such as: smartwatch or intelligent glasses etc., and only it is absorbed in certain one kind
Application function needs to be used cooperatively with other equipment such as smart phone, and such as Intelligent bracelet of all kinds of carry out sign monitorings, intelligence is first
The equipment such as decorations.
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 (14)
1. a kind of lens system characterized by comprising the first camera lens and the second camera lens set gradually from the object side to the image side,
Wherein:
First camera lens is the S-shaped bent moon eyeglass of negative power, and second camera lens is the biconvex eyeglass of positive light coke, institute
The focal length for stating the first camera lens and second camera lens meets the first relationship, so that the field angle FOV of the lens system is greater than the
One threshold value.
2. lens system according to claim 1, which is characterized in that first relationship are as follows:
- 2.6 < f1/f2< -1.6, wherein f1For the focal length of first camera lens, f2For the focal length of second camera lens.
3. lens system according to claim 1, which is characterized in that the first threshold is 100 degree.
4. lens system according to any one of claim 1 to 3, which is characterized in that the imaging surface of the lens system
On maximum image height Y', focal length f and the distance TTL of lower surface from display screen to imaging surface meet the second relationship so that described
The focal length of lens system is less than second threshold.
5. lens system according to claim 4, which is characterized in that second relationship are as follows: 0.2 < Y'/(f*TTL) <
0.6。
6. lens system according to any one of claim 1 to 3, which is characterized in that the lens system further include:
Diaphragm is set between first camera lens and second camera lens.
7. lens system according to any one of claim 1 to 3, which is characterized in that in the lens system at least
One face is aspherical.
8. lens system according to any one of claim 1 to 3, which is characterized in that the TV of the lens system distorts
Less than 5%, the relative illumination of the lens system is greater than 60%, and the F number of the lens system is less than 1.6.
9. lens system according to any one of claim 1 to 3, which is characterized in that by the way that the lens system is arranged
In the radius of curvature in each face, thickness, material, effective diameter, in circular cone coefficient at least one of and/or the camera lens system
The aspherical high-order coefficient of non-spherical lens in system, for example, so that the parameter of the lens system meets first relationship.
10. a kind of fingerprint identification device characterized by comprising
Lens system as claimed in any one of claims 1-9 wherein.
11. fingerprint identification device according to claim 10, which is characterized in that the fingerprint identification device further include:
Imaging sensor is set to the lower section of the lens system, for receiving the optical signal after lens system transmission,
And the optical signal is handled, to obtain the finger print information for including in the optical signal.
12. fingerprint identification device described in 0 or 11 according to claim 1, which is characterized in that further include: bracket；
Wherein, the lens system elastic conjunction is in the bracket.
13. a kind of terminal device characterized by comprising the fingerprint recognition dress as described in any one of claim 10 to 12
It sets.
14. terminal device according to claim 13, which is characterized in that the terminal device 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821359091.8U CN208569169U (en) | 2018-08-21 | 2018-08-21 | Lens system, fingerprint identification device and terminal device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821359091.8U CN208569169U (en) | 2018-08-21 | 2018-08-21 | Lens system, fingerprint identification device and terminal device |
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| Publication Number | Publication Date |
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| CN208569169U true CN208569169U (en) | 2019-03-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11106009B2 (en) | 2018-12-03 | 2021-08-31 | Largan Precision Co., Ltd. | Optical imaging lens assembly, image capturing unit and electronic device |
| US11366290B2 (en) | 2018-08-21 | 2022-06-21 | Shenzhen GOODIX Technology Co., Ltd. | Lens system, fingerprint identification apparatus and terminal device |
-
2018
- 2018-08-21 CN CN201821359091.8U patent/CN208569169U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11366290B2 (en) | 2018-08-21 | 2022-06-21 | Shenzhen GOODIX Technology Co., Ltd. | Lens system, fingerprint identification apparatus and terminal device |
| US11106009B2 (en) | 2018-12-03 | 2021-08-31 | Largan Precision Co., Ltd. | Optical imaging lens assembly, image capturing unit and electronic device |
| US11668906B2 (en) | 2018-12-03 | 2023-06-06 | Largan Precision Co., Ltd. | Optical imaging lens assembly, image capturing unit and electronic device |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| IP01 | Partial invalidation of patent right |
Commission number: 5W123462 Conclusion of examination: On the basis of the claims 1-11 submitted by the patentee on May 31, 2021, when the claims 1-4, 6 and 7 of the utility model patent No. 201821359091.8 are declared to refer to the claims 1-4 and 6 The technical solution of claim 10, the technical solution when claim 7 cited from claim 1-4, and 6 is invalid, and the technical solution when claim 5 and claim 7 are cited from claim 5, claim 8, 9, right On the basis of the technical solution when claim 7 cited in claim 10 refers to claim 5, the technical solution when claim 10 refers to claims 8 and 9, and claim 11, the patent right continues to be valid Decision date of declaring invalidation: 20211108 Decision number of declaring invalidation: 52536 Denomination of utility model: Lens system, fingerprint identification device and terminal equipment Granted publication date: 20190301 Patentee: SHENZHEN GOODIX TECHNOLOGY Co.,Ltd. |
|
| IP01 | Partial invalidation of patent right |