CN210038312U - Lens system, fingerprint identification device and terminal equipment - Google Patents
Lens system, fingerprint identification device and terminal equipment Download PDFInfo
- Publication number
- CN210038312U CN210038312U CN201920611669.2U CN201920611669U CN210038312U CN 210038312 U CN210038312 U CN 210038312U CN 201920611669 U CN201920611669 U CN 201920611669U CN 210038312 U CN210038312 U CN 210038312U
- Authority
- CN
- China
- Prior art keywords
- lens
- lens system
- focal length
- fingerprint
- fingerprint identification
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005499 meniscus Effects 0.000 claims abstract description 4
- 230000003287 optical effect Effects 0.000 claims description 72
- 238000001514 detection method Methods 0.000 claims description 20
- 238000003384 imaging method Methods 0.000 claims description 19
- 238000005286 illumination Methods 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 239000011889 copper foil Substances 0.000 claims description 7
- 239000006260 foam Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 33
- 239000000463 material Substances 0.000 description 11
- 201000009310 astigmatism Diseases 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012634 optical imaging Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012502 diagnostic product Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000004984 smart glass Substances 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Landscapes
- Lenses (AREA)
Abstract
A lens system, a fingerprint identification device and a terminal device comprise: the zoom lens comprises a first lens, a second lens and a third lens which are sequentially arranged from an object side to an image side, wherein the first lens is a meniscus negative focal power lens with a concave object side, the second lens is a positive focal power lens with a convex object side and a convex image side, and the third lens is a positive focal power lens with a convex object side and a convex image side; and the parameters of the lens system satisfy a first relationship such that an angle of view FOV of the lens system is greater than a first threshold, wherein the parameters of the lens system include at least two of: the focal length of the first lens, the focal length of the second lens, the focal length of the third lens, the combined focal length of the first lens and the second lens, the combined focal length of the second lens and the third lens, and the focal length of the lens system.
Description
The application is a divisional application of the utility model with the application date of 2018, 8, 21 and the application number of 201821351993.7 and the name of 'lens system, fingerprint identification device and terminal equipment'.
Technical Field
The embodiments of the present application relate to the field of optical imaging, and more particularly, to a lens system, a fingerprint recognition apparatus, and a terminal device.
Background
Along with the development of fingerprint identification sensor, fingerprint identification technology becomes a technical trend under the screen because do not occupy the physical position on the electronic equipment, and present fingerprint technology is based on the light collimation principle under the screen, and the resolution ratio of optics fingerprint module is decided by the distribution cycle and the aspect ratio of light collimation unit, if the size of optics fingerprint module is limited, fingerprint identification's resolution is lower, influences fingerprint identification's accuracy and security.
SUMMERY OF THE UTILITY MODEL
The application provides a camera lens system, fingerprint identification device and terminal equipment can realize the collection to fingerprint information on a large scale under the limited circumstances of size of fingerprint module, can promote fingerprint identification's analytic power to can promote fingerprint identification's rate of accuracy and security.
In a first aspect, a lens system is provided, including: the zoom lens comprises a first lens, a second lens and a third lens which are sequentially arranged from an object side to an image side, wherein the first lens is a meniscus negative focal power lens with a concave object side, the second lens is a positive focal power lens with a convex object side and a convex image side, and the third lens is a positive focal power lens with a convex object side and a convex image side;
and the parameters of the lens system satisfy a first relationship such that an angle of view FOV of the lens system is greater than a first threshold, wherein the parameters of the lens system include at least two of: the focal length of the first lens, the focal length of the second lens, the focal length of the third lens, the combined focal length of the first lens and the second lens, the combined focal length of the second lens and the third lens, and the focal length of the lens system.
Therefore, the lens system of the embodiment of the application meets the first relation through the lens with different focal powers in the layout and the parameters of the lens system, so that the lens system has the performance of a large FOV, and the fingerprint identification performance of the optical fingerprint identification module adopting the lens system can be improved.
In some possible implementations, the first relationship is: 1.0<f12/f3<2.7 wherein f12Is the combined focal length, f, of the first lens and the second lens3Is the focal length of the third lens.
In some possible implementations, the first threshold is 120 degrees.
In some possible implementations, the maximum image height Y' on the imaging plane of the lens system, the focal length f, and the distance TTL (i.e., the total optical height) from the lower surface of the display screen to the imaging plane satisfy a second relationship such that the focal length of the lens system is less than a second threshold.
In some possible implementations, the second relationship is: 0.4< Y'/(f TTL) < 0.5.
In some possible implementations, the lens system further includes:
and the diaphragm is arranged between the second lens and the third lens.
In some possible implementations, at least one facet of the lens system is aspheric.
In some possible implementations, the TV distortion of the lens system is less than 5%, the relative illumination of the lens system is greater than 30%, and the F-number of the lens system is less than 1.5.
Alternatively, at least one of a radius of curvature, a thickness, a material, an effective diameter, a cone coefficient of each surface in the lens system, and/or an aspherical high-order term coefficient of an aspherical lens in the lens system, for example, a2, a4, a6, A8, a10, a12, a14, a16, may be set so that parameters of the lens system satisfy the first relationship and the second relationship, thereby making the FOV of the lens system greater than 120 degrees, the TV distortion less than 5%, the F-number less than 1.5, and the relative illuminance greater than 30%.
In a second aspect, a fingerprint identification device is provided, which includes:
such as the first aspect or a lens system in any possible implementation of the first aspect.
In a possible implementation manner, the fingerprint identification apparatus further includes:
and the image sensor is arranged below the lens system and used for receiving the optical signal transmitted by the lens system and processing the optical signal so as to acquire the fingerprint information included in the optical signal.
In a possible implementation manner, the fingerprint identification apparatus further includes: a support frame is arranged on the base plate,
wherein the lens system is interference fitted in the holder.
In a third aspect, a terminal device is provided, which includes:
such as the first aspect or a lens system in any possible implementation of the first aspect.
In a possible implementation manner, the terminal device further includes:
the screen assembly comprises a display screen, foam and copper foil and is arranged above a lens system in the fingerprint identification device;
and the area of the foam and the copper foil above the lens system is opened so as to enable an optical signal containing fingerprint information to enter the lens system.
Drawings
Fig. 1 is a schematic structural diagram of a terminal device to which the embodiment of the present application is applied.
Fig. 2 is a schematic structural diagram of a lens system according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of an optical fingerprint identification module according to an embodiment of the present application.
Fig. 4 is a schematic diagram of one layout of a lens system according to an embodiment of the present application.
Fig. 5 is a relative illuminance diagram of the lens system of the layout shown in fig. 4.
Fig. 6 is an astigmatism diagram of the lens system of the arrangement shown in fig. 4.
Fig. 7 is a TV distortion diagram of the lens system of the layout shown in fig. 4.
Fig. 8 is an MTF graph of the lens system of the layout shown in fig. 4.
Fig. 9 is a schematic diagram of another layout of a lens system according to an embodiment of the present application.
Fig. 10 is a relative illuminance diagram of the lens system of the layout shown in fig. 9.
Fig. 11 is an astigmatism diagram of the lens system of the layout shown in fig. 9.
Fig. 12 is a TV distortion diagram of the lens system of the layout shown in fig. 9.
Fig. 13 is an MTF chart of the lens system of the layout shown in fig. 9.
Fig. 14 is a schematic diagram of still another layout of a lens system according to an embodiment of the present application.
Fig. 15 is a relative illuminance diagram of the lens system of the layout shown in fig. 14.
Fig. 16 is an astigmatism diagram of the lens system of the layout shown in fig. 14.
Fig. 17 is a TV distortion diagram of the lens system of the layout shown in fig. 14.
Fig. 18 is an MTF chart of the lens system of the layout shown in fig. 14.
Fig. 19 is a schematic structural diagram of a fingerprint recognition device according to an embodiment of the present application.
Fig. 20 is a schematic block diagram of a terminal device according to an embodiment of the present application.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings.
It should be understood that the embodiments of the present application can be applied to optical fingerprint systems, including but not limited to optical fingerprint identification systems and medical diagnostic products based on optical fingerprint imaging, and the embodiments of the present application are only described by way of example, but should not be construed as limiting the embodiments of the present application, and the embodiments of the present application are also applicable to other systems using optical imaging technology, etc.
It should also be understood that, the technical solution of the embodiment of the present application may perform other biometric identification besides fingerprint identification, for example, living body identification, and the like, which is also not limited in the embodiment of the present application.
As a common application scenario, the optical fingerprint system provided by the embodiment of the application can be applied to smart phones, tablet computers and other mobile terminals or other terminal devices with display screens; more specifically, in the terminal device, the fingerprint acquisition device may be embodied as an optical fingerprint device, which may be disposed in a partial area or an entire area below the display screen, thereby forming an Under-screen (Under-display) optical fingerprint system.
Fig. 1 is a schematic structural diagram of a terminal device to which the embodiment of the present invention is applicable, where the terminal device 700 includes a display screen 720 and an optical fingerprint device 730, where the optical fingerprint device 730 is disposed in a local area below the display screen 720. The optical fingerprint device 730 comprises a sensing array having a plurality of optical sensing units, and the sensing array is located in a fingerprint detection area 703 of the optical fingerprint device 730. As shown in fig. 1, the fingerprint detection area 703 is located in the display area 702 of the display screen 720, so that when a user needs to unlock or otherwise verify the fingerprint of the terminal device, the user only needs to press a finger on the fingerprint detection area 703 located on the display screen 720, so as to implement fingerprint input. Since fingerprint detection can be implemented in the screen, the terminal device 700 with the above structure does not need a special reserved space on the front surface thereof to set a fingerprint key (such as a Home key).
In a preferred embodiment, the display screen 720 may be a display screen having a self-luminous display unit, such as an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. Taking an OLED display screen as an example, the optical fingerprint device 730 may use the display unit (i.e., OLED light source) of the OLED display screen 720 located in the fingerprint detection area 703 as an excitation light source for optical fingerprint detection. Also, the sensing array of the optical fingerprint device 730 is specifically a Photo detector (Photo detector) array, which includes a plurality of Photo detectors distributed in an array, and the Photo detectors can be used as the optical sensing units as described above. When a finger presses the fingerprint detection area 703, light emitted by the display unit of the fingerprint detection area 703 is reflected from the fingerprint on the surface of the finger to form reflected light, wherein the reflected light of the ridges and valleys of the fingerprint of the finger is different, and the reflected light is received by the photodetector array from the display screen 720 and converted into a corresponding electrical signal, i.e., a fingerprint detection signal; fingerprint image data can be obtained based on the fingerprint detection signal, and fingerprint matching verification can be further performed, so that an optical fingerprint identification function is realized in the terminal device 700.
It should be appreciated that in a specific implementation, the terminal device 700 further includes a transparent protective cover 710, and the cover 710 may be a glass cover or a sapphire cover, and is located above the display 720 and covers the front surface of the terminal device 700. Because, in the embodiment of the present application, the pressing of the finger on the display screen 720 actually means pressing the cover 710 above the display screen 720 or a surface of a protective layer covering the cover 710.
As an alternative implementation, as shown in fig. 1, the optical fingerprint device 730 includes a light detection portion 734 and an optical component 732, where the light detection portion 734 includes the sensing array and a reading circuit and other auxiliary circuits electrically connected to the sensing array, which can be fabricated on a chip (Die) by a semiconductor process; the optical component 732 may be disposed above the sensing array of the light detecting portion 134, and may specifically include a Filter layer (Filter) for filtering out ambient light penetrating through the finger, a light guide layer for guiding the reflected light reflected from the surface of the finger to the sensing array for optical detection, and other optical elements.
In a specific implementation, the optical component 732 and the light detecting portion 134 can be packaged in the same optical fingerprint chip. The light guide layer can be a Lens (Lens) layer made of a semiconductor silicon wafer, the Lens (Lens) layer is provided with a plurality of Lens units, reflected light reflected from a finger passes through the Lens units and is received by an optical sensing unit below the Lens units, and accordingly, the sensing array can detect a fingerprint image of the finger.
In the optical fingerprint device 730, each lens unit may correspond to one of the optical sensing units of the sensing array; alternatively, the lens units and the optical sensing units of the sensing array may also adopt a non-one-to-one correspondence relationship to reduce moire interference, for example, one optical sensing unit may correspond to a plurality of lens units, or the lens units may also adopt an irregular arrangement manner; the irregular arrangement of the lens units can correct the reflected light detected by each sensing unit through a later software algorithm.
In other alternative implementations, the display screen 720 may also be a non-self-luminous display screen, such as a liquid crystal display screen that uses a backlight; in this case, the optical detection device 730 cannot use the display unit of the display screen 720 as the excitation light source, so that it is necessary to integrate the excitation light source inside the optical detection device 730 or dispose the excitation light source outside the optical detection device 730 to realize the optical fingerprint detection, and the detection principle is consistent with the above description.
It should be understood that in the embodiments of the present application, the sensing array in the optical fingerprint device may also be referred to as an image Sensor (Sensor), or a photo Sensor, and may be fabricated as a DIE by a semiconductor process, i.e., the DIE includes the image Sensor.
It should still understand, optical fingerprint device in this application embodiment also can be called optical fingerprint identification module, fingerprint identification device, fingerprint identification module, fingerprint collection device etc..
In order to better understand the embodiments of the present application, the performance index of the lens is first introduced.
The Field Of View (FOV) represents the Field Of View Of a lens, and if the lens size is equal, the larger the FOV Of the lens is, the larger the information that the lens can obtain the larger area is, that is, the larger the amount Of information that can be obtained by using the lens is.
And the F number is used for representing the light quantity entering the sensing array of the optical fingerprint device through the lens, and the smaller the F number is, the more the light quantity entering the lens is.
The TV distortion is used for measuring the visual distortion degree of the image, and it can be understood that the smaller the TV distortion is, the better the imaging effect is.
The relative illumination may refer to a ratio of the illumination of different coordinate points on the imaging surface to the illumination of the central point, and the smaller the relative illumination is, the more uneven the illumination of the imaging surface is, which is likely to cause problems of underexposure or overexposure at certain positions, and affect the imaging quality, i.e., the larger the relative illumination is, the higher the imaging quality is.
Fig. 2 is a schematic structural diagram of a lens system according to an embodiment of the present application, and as shown in fig. 2, the lens system 10 includes: the image capturing device comprises a first lens 11, a second lens 12 and a third lens 13 which are arranged in sequence from an object side to an image side, wherein the first lens 11 is a lens with negative focal power, the second lens 12 is a lens with positive focal power, and the third lens 13 is a lens with positive focal power, wherein the object side and the image side of the third lens are convex surfaces.
Specifically, the first lens is a meniscus negative power lens whose object side (i.e., the side close to the object side) is a concave surface, the second lens is a positive power lens whose object side and image side (i.e., the side close to the image side) are both convex surfaces, and the third lens is a lens whose object side and image side are both convex surfaces and positive power.
It is to be understood that the object side being concave or convex here refers to the case of unevenness of the surface of the lens in the optical axis direction on the object side, and similarly, the image plane side being convex or concave refers to the case of unevenness of the surface of the lens in the optical axis direction on the image plane side.
That is, the first lens 11 may be a concave lens, the second lens 12 may be a convex lens, and the third lens may be a convex lens.
It should be understood that, in the embodiment of the present application, the first lens may be a concave lens, or may also be a group of lenses, as long as the combined focal power of the group of lenses is negative focal power, and similarly, the second lens may also be a convex lens, or may also be a group of lenses, as long as the combined focal power of the group of lenses is positive focal power, and similarly, the third lens is also the same, and details are not described here.
Optionally, in some embodiments, the first lens, the second lens, and the third lens may be made of a resin material or another plastic material, which is not limited in this application.
Further, the parameters of the lens system are set to satisfy a first relationship such that the FOV of the lens system is greater than a first threshold, which may include, by way of example and not limitation, at least two of: the focal length of the first lens, the focal length of the second lens, the focal length of the third lens, the combined focal length of the first lens and the second lens, the combined focal length of the second lens and the third lens, and the focal length of the lens system.
For example, the parameter of the lens system satisfying the first relationship may be that a ratio of focal lengths of the first lens and the second lens is within a specific range, or a ratio of a combined focal length of the first lens and the second lens to a focal length of the third lens is within a specific range, or a ratio of a focal length of the first lens to a combined focal length of the second lens and the third lens is within a specific range, and the like, which is not limited in this embodiment of the application.
Optionally, in some embodiments, the first relationship may be: 1.0<f12/f3<2.7 wherein f12Is the combined focal length, f, of the first lens and the second lens3Is the firstThe focal length of the three lenses.
That is to say, this application embodiment can be through the specific value that sets up the combination focus of first camera lens and second camera lens and the focus of this third camera lens at certain within range to can make this lens system have the big characteristic of FOV, like this, the fingerprint identification module that adopts this lens system can gather the fingerprint information of bigger region, and then can promote fingerprint identification's degree of accuracy and security.
Optionally, in some embodiments, the first threshold is 120 degrees.
Therefore, the parameters of the lens system are set to meet the first relation, so that the FOV of the lens system is larger than 120 degrees, and therefore, under the condition that the sizes of the lenses are the same, fingerprint information of a larger area can be collected, and the fingerprint identification resolving power is favorably improved.
Optionally, in some embodiments, the F number of the lens system is less than 1.6, so that enough light can enter the lens system, which is beneficial to acquiring a weak fingerprint signal, and meanwhile, the exposure time can be shortened, and the power consumption can be reduced.
Optionally, in some embodiments, the TV distortion of the lens system is less than 5%, which is beneficial to avoid the influence of moire fringes on fingerprint imaging.
Optionally, in some embodiments, the relative illumination of the lens system is greater than 30%, which is beneficial to improving the imaging quality.
Therefore, the lens system of the embodiment of the application meets the first relation through the lens with different focal powers, and the parameters of the lens system are set, so that the lens system has the performances of large FOV, small working F number, small TV distortion and large relative illumination, and the fingerprint identification performance of the fingerprint identification module adopting the lens system is favorably improved.
Optionally, in some embodiments, the maximum image height Y' on the imaging plane of the lens system, the focal length f, and the distance TTL from the lower surface of the display screen to the imaging plane satisfy a second relationship, so that the focal length of the lens system is less than a second threshold.
It should be understood that the size of TTL determines the size of the focal length of the lens system, or the size of the lens system, and in the embodiment of the present application, by controlling Y', f and TTL to satisfy the second relationship, the lens system can have a shorter focal length while having a larger FOV, so that the lens system can be better applied to a terminal device with a requirement on the size.
It is understood that the display screen herein may be a display screen in an electronic device to which the lens system is mounted, and the imaging plane may be a surface of an image sensor, and the image sensor may correspond to a DIE in an optical fingerprint recognition module, that is, a portion for performing optical signal detection.
Optionally, in some embodiments, the second relationship may be: 0.4< Y'/(f TTL) < 0.5.
Alternatively, the second threshold may be 1 mm, 5 mm, or 3 mm, and the like, which is not limited in this application embodiment as long as the size requirement of the terminal device can be met.
Optionally, in some embodiments, the lens system further includes:
and the diaphragm is arranged between the second lens and the third lens.
Specifically, the diaphragm can be used for adjusting the size of light signal or formation of image scope, adjusts light signal or formation of image scope through setting up the diaphragm, can make the light signal furthest that has fingerprint information image on the image sensor's in optics fingerprint identification module surface for this image sensor can obtain more fingerprint information, further can promote fingerprint identification's analytic power.
To sum up, the lens system of this application embodiment is a wide angle short focus lens, and the wide angle design makes this lens system can gather the fingerprint information of bigger region, and the short focus design makes this lens system occupy littleer space to this lens system can also satisfy the requirement of terminal equipment to the size when realizing more excellent fingerprint identification performance, has strengthened the suitability of this lens system.
Alternatively, in some embodiments, the parameters of the lens system may satisfy the first and second relationships by controlling physical parameters such as the radius of curvature, thickness, material, effective diameter, and conic coefficient of each structural member (e.g., the first lens, the second lens, the stop, and the third lens) in the lens system, and/or the aspheric high-order term coefficients (e.g., even-order terms in a 2-a 16) of the aspheric lens in the lens system, so that the FOV of the lens system is greater than 120 degrees, the TV distortion of the lens system is less than 5%, the relative illuminance of the lens system is greater than 30%, and the F-number of the lens system is less than 1.5, which will be described in detail below with reference to specific embodiments.
It should be understood that the lens system of the embodiment of the present application can be applied to an optical fingerprint identification module, and the lens system can be matched with an image sensor in the optical fingerprint identification module to realize imaging of fingerprint information of a larger area in a limited space; alternatively, the lens system may also be applied to other apparatuses or devices with higher requirements on optical imaging performance, which is not limited in the embodiments of the present application.
Fig. 3 is a schematic structural diagram of an optical fingerprint identification module using the lens system according to the embodiment of the present application. As shown in fig. 3, the optical fingerprint identification module 200 may include an Infrared Filter (IR Filter)201, an IR Filter bonding adhesive 202, a chip (DIE)203, a DIE bonding adhesive 204, a Flexible Printed Circuit (FPC) 205, a stiffener 206, a bracket 207, and a lens system 209.
The IR Filter is used for filtering infrared light so as to avoid the influence of the infrared light on fingerprint imaging;
the IR filter bonding adhesive 202 is used for bonding the IR filter 201 and the DIE 203;
a DIE203, corresponding to the light detecting portion 734 in fig. 1, for converting an optical signal into an electrical signal, which can be used in conjunction with the lens system 209 to convert an optical signal imaged through the lens system 209 into an electrical signal;
the DIE bonding adhesive 204 is used for fixing the DIE203 and a Flexible Printed Circuit (FPC) 205.
An FPC205 for connecting the DIE203 with circuitry in the electronic device on which the optical fingerprint identification module is mounted;
a mount 207 for fixing the lens system 209 and the DIE203 to control the accuracy of defocus and decentration.
This optics fingerprint identification module 200's top still is provided with the display screen module, including display screen 320, bubble cotton 310 and copper foil 300.
In the embodiment of the present application, the lens system 209 can be interference fit in the holder 207, so that the lens system 209 and the DIE203 are attached together, the various components of the optical fingerprint identification module can be adhered together by glue, and further the optical fingerprint identification module can be fixed in the middle frame 208 of the electronic device.
Since the optical signal needs to be transmitted between the lens system 209 and the display screen 320, the foam 310 and the aluminum foil 300 in the display screen module corresponding to the lens system 209 need to be opened to allow the optical signal within the FOV of the lens system 209 to pass through.
Hereinafter, the performance of the lens system according to the embodiment of the present application will be specifically described with reference to embodiments 1 to 3.
In embodiments 1 to 3, the lens systems each include three groups of lenses and diaphragms, and fig. 4, 9, and 14 respectively show three layouts (layout) of the lens systems of embodiments 1 to 3, in which, in order from the object side to the image side, there are provided: the display screen 20, the first lens 21, the second lens 22, the diaphragm, the third lens 23, the IR filter, and the filter attaching glue.
The first lens 21, the second lens 22 and the third lens 23 correspond to the first lens 11, the second lens 12 and the third lens 13, respectively, that is, the first lens 21 is a concave lens, the second lens 22 is a convex lens and the third lens 23 is a convex lens.
For convenience of distinction and description, in order from the object side to the image side, the upper and lower surfaces of the display screen 20 are respectively denoted as S1 and S2, the two surfaces of the first lens 21 are respectively denoted as S3 and S4, the two surfaces of the second lens 22 are respectively denoted as S5 and S6, the surface of the stop is denoted as S7, the two surfaces of the third lens 23 are respectively denoted as S8 and S9, the surfaces of the IR filter are respectively denoted as S10 and S11, the surfaces of the filter bonding paste 26 are respectively denoted as S12 and S13, and the imaging surface is denoted as S14.
Further, by setting at least one of a radius of curvature, a thickness, a material, an effective diameter, a conical coefficient of each surface in the lens system, and/or aspherical high-order term coefficients a2, a4, a6, A8, a10, a12, a14, a16 of an aspherical lens in the lens system, parameters of the lens system satisfy the above-described first relationship and second relationship, so that the FOV of the lens system is greater than 120 degrees, the TV distortion is less than 5%, the F-number is less than 1.5, and the relative illuminance is greater than 30%.
The first relationship is as follows: 1.0<f12/f3<2.7, the second relationship is: 0.4<Y'/(f*TTL)<0.5 is an example for explanation, but the present application is not limited thereto.
In embodiment 1, the curvature radius, thickness, material, effective diameter, and conic coefficient of each of the surfaces S1 to S14 may be set to the corresponding parameters in table 1, and the aspherical high-order coefficient of the aspherical surfaces S1 to S14 may be set to the parameters shown in table 2.
TABLE 1
It should be understood that the blank positions corresponding to the reference numbers in tables 1 to 6 of the embodiments of the present application indicate that there is no such parameter, for example, the blank spaces at the material may indicate air, and the parameters of S12 and S13 are not shown because S11 and S12 are the same surface and S13 and S14 are the same surface, so the parameters of S12 and S13 are not shown.
TABLE 2
| Surface of | A2 | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S3 | 0.186 | -0.115 | 0.017 | 0.072 | 0.018 | -0.141 | 0.084 | |
| S4 | 1.842 | 2.028 | 4.720 | 15.322 | -39.819 | 80.660 | 806.794 | |
| S5 | -0.467 | -0.953 | -17.523 | 20.146 | 41.789 | 612.681 | -1558.96 | |
| S6 | -1.775 | 14.465 | 0.202 | -781.236 | -1275.87 | 6.396e4 | -2.171e5 | |
| S8 | -0.412 | 13.089 | -10.739 | 213.890 | -4802.74 | 1.760e4 | 1.118e4 | |
| S9 | -1.718 | 28.238 | -27.843 | -230.463 | -2210.54 | 7.108e4 | -2.641e5 |
Based on the parameters shown in table 1 and table 2, the parameters of the lens system shown in embodiment 1 can be determined as follows: TTL ═ 3.38 (i.e., distance S2 to S14), f1＝-0.601758，f2＝0.822380，f3＝0.743935，f12＝1.590600，f＝0.367239，f12/f32.13809, Y'/(f TTL) 0.465995, i.e., the parameters of the lens system satisfy the first relationship and the second relationship. Under the above parameters, fig. 5 to 8 are a relative illuminance diagram, an astigmatism diagram, a TV distortion diagram, and a module value (MTF) diagram of an Optical Transfer Function (Optical Transfer Function) of the lens system in sequence.
As can be seen from the simulation graphs shown in fig. 5 to 8, the FOV of the lens system is 124 degrees, the working F number is 1.223, the TV distortion is-2.028%, and the relative illuminance is 41.0%. Therefore, in the case where the parameters of the lens system satisfy the aforementioned first and second relationships, the lens system has the performance of a large FOV, a small working F-number, a small TV distortion, and a high relative illuminance.
In embodiment 2, the curvature radius, thickness, material, effective diameter, and conic coefficient of each of the surfaces S1 to S14 may be set to the corresponding parameters in table 3, and the aspherical high-order coefficient of the aspherical surfaces S1 to S14 may be set to the parameters shown in table 4.
TABLE 3
| Surface of | Surface type | Radius of curvature | Thickness of | Material | Effective diameter | Coefficient of cone |
| S1 | Article surface | All-round | 1.5 | BK7 | 4.04 | |
| S2 | Spherical surface | All-round | 1.191 | 3.043 | ||
| S3 | Aspherical surface | -18.230 | 0.218 | APL5015AL | 1.029 | 300.767 |
| S4 | Aspherical surface | 0.341 | 0.461 | 0.484 | -1.481 | |
| S5 | Aspherical surface | 0.341 | 0.461 | OKP-1 | 0.433 | -0.588 |
| S6 | Aspherical surface | 0.569 | 0.400 | -421.586 | ||
| S7 | Diaphragm surface | All-round | 0.036 | 0.282 | ||
| S8 | Aspherical surface | 1.743 | 0.370 | APL5014CL | 0.302 | -2.127 |
| S9 | Aspherical surface | -0.571 | 0.355 | 0.364 | -4.503 | |
| S10 | Spherical surface | All-round | 0.21 | D263TECO | 0.511 | |
| S11 | Spherical surface | All-round | 0.02 | BK7 | 0.613 | |
| S14 | Image plane | 0.624 |
TABLE 4
| Surface of | A2 | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S3 | 0.185 | -0.116 | 0.015 | 0.072 | 0.019 | -0.140 | 0.085 | |
| S4 | 1.736 | 2.063 | 5.227 | 19.324 | -13.532 | 226.239 | 1463.033 | |
| S5 | -0.458 | -0.913 | -17.906 | 12.240 | -22.420 | 301.434 | -2517.25 | |
| S6 | -1.995 | 11.807 | -13.286 | -820.210 | -1255.51 | 6.513e4 | -2.086e5 | |
| S8 | -0.660 | -13.691 | -101.157 | 1098.053 | 1.631e4 | -727.929 | -1.150e6 | |
| S9 | -2.785 | 34.032 | -77.283 | -294.196 | -1411.69 | 4248.241 | 1.322e5 |
Based on the parameters shown in tables 3 and 4, the parameters of the lens system shown in embodiment 1 can be determined as follows: TTL (3.36613) (i.e., distance S2 to S14), f1＝-0.608717，f2＝0.727880，f3＝0.832835，f12＝1.105138，f＝0.39179，f12/f31.327, Y'/(f × TTL) ═ 0.451, that is, the parameters of the lens system satisfy the first relationship and the second relationship described above. Under the above parameters, fig. 10 to 13 are a relative illuminance diagram, an astigmatism diagram, a TV distortion diagram and an MTF diagram of the lens system in sequence.
As can be understood from the simulation graphs shown in fig. 10 to 13, the FOV of the lens system is 123 degrees, the working F number is 1.247, the TV distortion is-2.102%, and the relative illuminance is 34.6%. Therefore, in the case where the parameters of the lens system satisfy the aforementioned first and second relationships, the lens system has the performance of a large FOV, a small working F-number, a small TV distortion, and a high relative illuminance.
In embodiment 3, the curvature radius, thickness, material, effective diameter, and conic coefficient of each of the surfaces S1 to S14 may be set to the corresponding parameters in table 5, and the aspherical high-order coefficient of the aspherical surfaces S1 to S14 may be set to the parameters shown in table 6.
TABLE 5
| Surface of | Surface type | Radius of curvature | Thickness of | Material | Effective diameter | Coefficient of cone |
| S1 | Article surface | All-round | 1.5 | BK7 | 4.00 | |
| S2 | Spherical surface | All-round | 1.3 | 3.019 | ||
| S3 | Aspherical surface | -19.863 | 0.210 | APL5014CL | 0.971 | 404.468 |
| S4 | Aspherical surface | 0.327 | 0.408 | 0.507 | -1.663 | |
| S5 | Aspherical surface | 0.571 | 0.361 | APL5014CL | 0.465 | -0.639 |
| S6 | Aspherical surface | -1.531 | 0.097 | 0.370 | -274.759 | |
| S7 | Diaphragm surface | All-round | 0.023 | 0.305 | ||
| S8 | Aspherical surface | 1.056 | 0.462 | APL5014CL | 0.355 | 2.010 |
| S9 | Aspherical surface | -0.529 | 0.356 | 0.347 | -6.033 | |
| S10 | Spherical surface | All-round | 0.21 | D263TECO | 0.426 | |
| S11 | Spherical surface | All-round | 0.02 | BK7 | 0.528 | |
| S14 | Image plane | 0.540 |
TABLE 6
| Surface of | A2 | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S3 | 0.174 | -0.096 | 0.013 | 0.049 | 3.276e-3 | -0.140 | 0.110 | |
| S4 | 2.128 | 1.912 | 0.685 | -2.957 | -26.139 | 143.791 | -678.914 | |
| S5 | -0.783 | 0.812 | -9.438 | 48.170 | 75.200 | 143.152 | -385.979 | |
| S6 | -1.196 | 14.044 | 23.499 | -928.722 | -350.306 | 6.612e4 | -1.853e5 | |
| S8 | 0.073 | 9.744 | -23.095 | 57.055 | -323.067 | 600.961 | 2.541e4 | |
| S9 | -2.117 | 24.670 | 35.827 | -108.577 | -991.275 | 932.978 | 1.799e5 |
Based on the parameters shown in tables 5 and 6, the parameters of the lens system shown in embodiment 3 can be determined as follows: TTL (3.44816) (i.e., distance S2 to S14), f1＝-0.584991，f2＝0.808783，f3＝0.717745，f12＝1.861261，f＝0.373529，f12/f32.593, Y'/(f TTL) is 0.444, that is, the parameters of the lens system satisfy the first relationship and the second relationship. Under the above parameters, fig. 15 to 18 are a relative illuminance diagram, an astigmatism diagram, a TV distortion diagram and an MTF diagram of the lens system in sequence.
As can be understood from the simulation graphs shown in fig. 15 to 18, the FOV of the lens system is 120 degrees, the working F-number is 1.240, the TV distortion is 1.755%, and the relative illuminance is 45.8%. Therefore, in the case where the parameters of the lens system satisfy the aforementioned first and second relationships, the lens system has the performance of a large FOV, a small working F-number, a small TV distortion, and a high relative illuminance.
To sum up, the lens system of the embodiment of the application provides a wide-angle short-focus lens, and the lens system can acquire fingerprint information of a larger area, and the short-focus design enables the lens system to be better applied to terminal equipment with requirements on size, so that the applicability of the lens system is enhanced.
Fig. 19 is a schematic block diagram of a fingerprint recognition device according to an embodiment of the present application, and as shown in fig. 19, the fingerprint recognition device 400 may include a lens system 401, and the lens system 401 may be the lens system 10 in the foregoing embodiment.
Optionally, the fingerprint recognition apparatus may include an image sensor 402 disposed below the lens system 401 for receiving the optical signal processed by the lens system and processing the optical signal to obtain fingerprint information included in the optical signal.
Optionally, the fingerprint identification device 400 corresponds to the optical fingerprint identification module 200 shown in fig. 3, and the fingerprint identification device 400 may further include structures in the optical fingerprint identification module 200, such as the IR filter 201 and the bracket 207, which are not described herein again.
The embodiment of the present application further provides a terminal device, as shown in fig. 20, the terminal device 500 includes a fingerprint identification device 510, and the fingerprint identification device 510 may be the fingerprint identification device 400 in the foregoing embodiment or the optical fingerprint identification module 200 in the embodiment shown in fig. 3.
Optionally, the terminal device may further include a screen assembly 520, which includes a display screen, foam, and a copper foil, and is disposed above the lens system in the fingerprint identification device 510;
and the area of the foam and the copper foil above the lens system is opened so as to enable an optical signal containing fingerprint information to enter the lens system.
By way of example and not limitation, the terminal device 500 may be a mobile phone, a tablet computer, a notebook computer, a desktop computer, a vehicle-mounted electronic device, or a wearable smart device, and the wearable smart device includes a full-function, a large-size, and may implement a complete or partial function without depending on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application function, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets for physical sign monitoring, smart jewelry and other devices.
It should be understood that the specific examples in the embodiments of the present application are for the purpose of promoting a better understanding of the embodiments of the present application, and are not intended to limit the scope of the embodiments of the present application, and that various modifications and variations can be made by those skilled in the art based on the above embodiments and fall within the scope of the present application.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (13)
1. A lens system, comprising:
the lens comprises a first lens, a second lens and a third lens which are arranged in sequence from an object side to an image side, wherein the first lens is a meniscus negative power lens with a concave surface on the object side, and the image side of the first lens is a concave surface; the third lens is a lens with positive focal power, the object side and the image surface side of the lens are convex surfaces,
the diaphragm is arranged between any two lenses of the first lens, the second lens and the third lens and is used for adjusting an optical signal or an imaging range;
and the parameters of the lens system satisfy a first relationship such that an angle of view FOV of the lens system is greater than a first threshold, wherein the parameters of the lens system include at least two of: the focal length of the first lens, the focal length of the second lens, the focal length of the third lens, the combined focal length of the first lens and the second lens, the combined focal length of the second lens and the third lens, and the focal length of the lens system.
2. The lens system of claim 1, wherein the first relationship is: 1.0<f12/f3<2.7 wherein f12Is the combined focal length, f, of the first lens and the second lens3Is the focal length of the third lens.
3. A lens system as claimed in claim 1 or 2, characterized in that the first threshold is 120 degrees.
4. The lens system according to claim 1, wherein a maximum image height Y' on an imaging plane of the lens system, a focal length f, and a distance TTL from a lower surface of the display screen to the imaging plane satisfy a second relationship such that the focal length of the lens system is less than a second threshold.
5. The lens system of claim 4, wherein the second relationship is: 0.4< Y'/(f TTL) < 0.5.
6. The lens system according to claim 1, wherein the second lens is a positive power lens in which both an object side and an image plane side are convex.
7. The lens system of claim 6, wherein at least one facet in the lens system is aspheric.
8. The lens system as claimed in claim 7, wherein the TV distortion of the lens system is less than 5%, the relative illumination of the lens system is greater than 30%, and the F-number of the lens system is less than 1.5.
9. A fingerprint identification device for setting up in order to carry out fingerprint detection under the screen below the display screen, its characterized in that, fingerprint identification device includes:
a lens system as claimed in any one of claims 1 to 8;
and the image sensor is arranged below the lens system and used for receiving the optical signal transmitted by the lens system and processing the optical signal so as to acquire the fingerprint information included in the optical signal.
10. The fingerprint recognition device according to claim 9, further comprising:
a holder for fixing the lens system and the image sensor;
wherein the lens system is interference fitted in the holder.
11. The fingerprint recognition device according to claim 10, further comprising: and the infrared filter is arranged between the lens system and the image sensor and is used for filtering infrared light entering the image sensor.
12. A terminal device, comprising: the fingerprint recognition device according to claim 9.
13. The terminal device according to claim 12, wherein the terminal device further comprises:
the screen assembly comprises a display screen, foam and copper foil and is arranged above a lens system in the fingerprint identification device;
and the area of the foam and the copper foil above the lens system is opened so as to enable an optical signal containing fingerprint information to enter the lens system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920611669.2U CN210038312U (en) | 2018-08-21 | 2018-08-21 | Lens system, fingerprint identification device and terminal equipment |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920611669.2U CN210038312U (en) | 2018-08-21 | 2018-08-21 | Lens system, fingerprint identification device and terminal equipment |
| CN201821351993.7U CN208888461U (en) | 2018-08-21 | 2018-08-21 | Lens system, fingerprint identification device and terminal device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821351993.7U Division CN208888461U (en) | 2018-08-21 | 2018-08-21 | Lens system, fingerprint identification device and terminal device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210038312U true CN210038312U (en) | 2020-02-07 |
Family
ID=66509459
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920611669.2U Active CN210038312U (en) | 2018-08-21 | 2018-08-21 | Lens system, fingerprint identification device and terminal equipment |
| CN201821351993.7U Active CN208888461U (en) | 2018-08-21 | 2018-08-21 | Lens system, fingerprint identification device and terminal device |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821351993.7U Active CN208888461U (en) | 2018-08-21 | 2018-08-21 | Lens system, fingerprint identification device and terminal device |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN210038312U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11774708B2 (en) | 2018-08-21 | 2023-10-03 | Shenzhen GOODIX Technology Co., Ltd. | Lens system, fingerprint identification apparatus and terminal device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI679449B (en) | 2018-12-03 | 2019-12-11 | 大立光電股份有限公司 | Optical imaging lens assembly, image capturing unit and electronic device |
| TWI691733B (en) * | 2019-04-10 | 2020-04-21 | 大立光電股份有限公司 | Optical photographing lens assembly, fingerprint identification module and electronic device |
| TWI721686B (en) * | 2019-12-06 | 2021-03-11 | 聲遠精密光學股份有限公司 | Fingerprint identification module and optical imaging lens |
| WO2023035277A1 (en) * | 2021-09-13 | 2023-03-16 | 迪克创新科技有限公司 | Lens system, optical fingerprint recognition apparatus, and terminal device |
-
2018
- 2018-08-21 CN CN201920611669.2U patent/CN210038312U/en active Active
- 2018-08-21 CN CN201821351993.7U patent/CN208888461U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11774708B2 (en) | 2018-08-21 | 2023-10-03 | Shenzhen GOODIX Technology Co., Ltd. | Lens system, fingerprint identification apparatus and terminal device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN208888461U (en) | 2019-05-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109196521B (en) | Lens system, fingerprint identification device and terminal equipment | |
| CN109196519B (en) | Lens system, fingerprint identification device and terminal equipment | |
| CN210038312U (en) | Lens system, fingerprint identification device and terminal equipment | |
| CN110073265B (en) | Lens assembly and fingerprint identification module | |
| WO2020132974A1 (en) | Fingerprint recognition apparatus and electronic device | |
| TWI704386B (en) | Image capturing apparatus | |
| CN111213080B (en) | Lens, fingerprint identification device and electronic equipment | |
| CN109564338B (en) | Lens group, fingerprint identification device and electronic equipment | |
| CN110546649A (en) | Optical fingerprint identification device and system under screen, diffusion barrier and liquid crystal display | |
| US20200049955A1 (en) | Image capturing apparatus | |
| CN208569169U (en) | Lens system, fingerprint identification device and terminal device | |
| WO2020243936A1 (en) | Under-screen biometric feature identification apparatus and electronic device | |
| CN208953768U (en) | Lens group, fingerprint identification device and electronic equipment | |
| CN113777754B (en) | Lens system, optical fingerprint identification device and terminal equipment | |
| CN210295132U (en) | Fingerprint identification subassembly, display module and electronic equipment | |
| CN112799212A (en) | Lens system, optical sensing device and electronic equipment | |
| CN210038308U (en) | Lens, fingerprint identification device and electronic equipment | |
| WO2023035277A1 (en) | Lens system, optical fingerprint recognition apparatus, and terminal device | |
| CN219657940U (en) | Lens system, optical fingerprint device and electronic equipment | |
| CN214067796U (en) | Lens system, optical sensing device and electronic equipment | |
| CN118348662A (en) | Lens system, fingerprint identification device and terminal equipment | |
| CN112989873A (en) | Optical object grain recognition device and terminal equipment | |
| CN116500756A (en) | Lens system, optical fingerprint device and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| IP01 | Partial invalidation of patent right | ||
| IP01 | Partial invalidation of patent right |
Commission number: 5W123062 Conclusion of examination: On the basis of claims 1-8 submitted by the patentee on March 23, 2021, the patent right of utility model no. 201920611669.2 is maintained valid Decision date of declaring invalidation: 20210723 Decision number of declaring invalidation: 51090 Denomination of utility model: Lens system, fingerprint identification device and terminal equipment Granted publication date: 20200207 Patentee: SHENZHEN GOODIX TECHNOLOGY Co.,Ltd. |