CN218240537U - Two-piece optical lens, fingerprint identification device comprising two-piece optical lens and electronic equipment comprising two-piece optical lens - Google Patents

Abstract

The application discloses two formula optical lens and contain its fingerprint identification device and electronic equipment relates to optical lens's technical field. A two-piece optical lens is used for fingerprint identification and is characterized by comprising a first super lens and a second super lens in sequence from an object side to an image side; wherein, the two-piece optical lens satisfies: the HFOV is more than or equal to 28 degrees and less than or equal to 61.9 degrees; f/D is less than or equal to 1.7, TTL is less than or equal to 3.7mm; TTL/ImgH is more than or equal to 1.1 and less than or equal to 2.5; the effective focal length of the two-piece optical lens is f, the entrance pupil diameter of the two-piece optical lens is D, the HFOV is the maximum half field angle of the two-piece optical lens, the TTL is the total system length of the two-piece optical lens, and the ImgH is the maximum imaging half height width. Through the parameter setting of two super lenses, this application just can only be through two super lenses in the super lens group, both satisfies the big angle of vision, effectively reduces the system length of camera lens again.

Description

Two-piece optical lens, fingerprint identification device comprising two-piece optical lens and electronic equipment comprising two-piece optical lens

Technical Field

The application relates to the technical field of optical lenses, in particular to a two-piece optical lens, a fingerprint identification device comprising the same and electronic equipment.

Background

With the popularization of smart cities, the unlocking mode according to personal characteristics such as human faces and fingerprints gradually replaces the traditional non-specific unlocking modes such as metal keys and magnetic cards, and is widely applied to the fields of mobile phones, door locks and the like. In a fingerprint identification system, an optical system is required to collect fingerprint textures, and the optical system needs to meet the requirements of a large field angle and a small TTL (Total Track Length) as far as possible. In the existing optical system, multiple aspheric lenses are generally adopted to meet the requirement of large field angle, but the TTL is relatively large due to the multiple aspheric lenses. This has the problem that both a large viewing angle and a small TTL cannot be satisfied.

Disclosure of Invention

In order to solve the above problem, that is, the problem that the existing fingerprint optical system cannot take into account both a large field angle and a small overall length of the system, the present application provides a two-piece optical lens, which includes:

the lens comprises a first super lens and a second super lens in sequence from the object side to the image side;

wherein, the two-piece optical lens satisfies:

28°≤HFOV≤61.9°；

f/D≤1.7；

TTL≤3.7mm；

1.1≤TTL/ImgH≤2.5；

wherein f is an effective focal length of the two-piece optical lens, D is an entrance pupil diameter of the two-piece optical lens, HFOV of the two-piece optical lens is a maximum half field angle, TTL is a total system length of the two-piece optical lens, and ImgH is a maximum imaging half height width.

Optionally, any one of the first and second superlenses satisfies the following equation:

0.05mm≤d _m ≤2mm；

1.4≤n _m ≤1.6；

wherein d is _m Is the thickness of any one of the first and second superlenses, n _m Is an effective refractive index of either one of the first superlens and the second superlens.

Optionally, a phase distribution of any one of the first superlens and the second superlens satisfies at least one of the following equations:

wherein r is a distance from the center of the first superlens or the second superlens to the nanostructure, λ is an operating wavelength,

for any phase associated with the wavelength, x and y are the superlens mirror coordinates, f _m Is the focal length of either the first superlens or the second superlens, a _i And b _i Are real number coefficients.

Optionally, the working wavelength band of the first superlens and the second superlens is a near infrared wavelength band or a visible wavelength band.

Optionally, the focal length of the first superlens is greater than or equal to 10mm, and less than or equal to 12mm.

Optionally, the focal length of the first superlens is equal to 11.14mm.

Optionally, the focal length of the second superlens is greater than or equal to 1.4mm, and less than or equal to 2.8mm.

Optionally, the focal length of the second superlens is equal to 1.4mm.

In a second aspect, the present application further provides a fingerprint identification device, including:

a two-piece optical lens and a photosensor as provided in any of the above embodiments; the photoelectric sensor is arranged on the image surfaces of the two-piece optical lens.

Optionally, the fingerprint identification device further comprises an optical filter;

the optical filter is arranged between the two-piece optical lens and the photoelectric sensor on an optical path.

Optionally, the fingerprint identification device further comprises a diaphragm;

the diaphragm is arranged on the object side of the two-piece optical lens.

In a third aspect, an embodiment of the present application further provides an electronic device, including:

the fingerprint identification module provided by any one of the above embodiments.

The beneficial effect of this application does:

1. the two super lenses are arranged in sequence, so that the large field angle can be provided, and the total length of the optical system can be effectively reduced, so that the overall space occupancy rate of the optical system is effectively reduced;

2. by adopting the two super lenses, a plurality of aspheric lenses are omitted, so that the TTL of the optical system is effectively reduced, and the super lenses are lower in volume production cost compared with the plurality of aspheric lenses;

3. By adopting the super lens or the combination of the super lenses, the whole structure of the system is simpler, the weight is lighter, the volume is smaller and more exquisite, and the imaging speed is faster.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

Fig. 1 shows a schematic structural diagram of a two-piece optical lens of the present application.

Fig. 2 shows one of the structural diagrams of the electronic device of the present application.

Fig. 3 shows an effect diagram i of one embodiment of the present application.

Fig. 4 shows an effect diagram two of one embodiment of the present application.

Fig. 5 shows a first effect of another embodiment of the present application.

Fig. 6 shows an effect diagram two of another embodiment of the present application.

Fig. 7 shows a schematic of the arrangement of the nanostructures of the present application.

Fig. 8 shows a schematic of the structure of the nanostructures of the present application.

In the drawings, reference numerals denote:

1. a first superlens; 2. a second superlens; 3. a nanostructure; 4. an optical filter; 5. an image plane; 6. fingerprint identification optical system.

Detailed Description

The present application will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments are shown. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Like reference numerals refer to like parts throughout. Also, in the drawings, the thickness, ratio and size of the components are exaggerated for clarity of illustration.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, "a," "an," "the," and "at least one" do not denote a limitation of quantity, but rather are intended to include both the singular and the plural, unless the context clearly indicates otherwise. For example, "a component" has the same meaning as "at least one component" unless the context clearly dictates otherwise. "at least one of" should not be construed as limited to the quantity "one". "or" means "and/or". The term "and/or" includes any and all combinations of one or more of the associated listed items.

Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms defined in commonly used dictionaries should be interpreted as having the same meaning as in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The meaning of "comprising" or "comprises" indicates a property, a quantity, a step, an operation, a component, a part, or a combination thereof, but does not exclude other properties, quantities, steps, operations, components, parts, or combinations thereof.

Embodiments are described herein with reference to cross-sectional views that are idealized embodiments. Thus, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, regions shown or described as flat may typically have rough and/or nonlinear features. Also, the acute angles shown may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the claims.

The optical lens in the prior art usually needs a combination of at least four aspheric lenses to achieve a maximum field angle of 151 °, a total system length of 5.05mm, and a relative aperture (Fno) of an aperture of 1.66. However, the alignment accuracy requirement is high when at least four aspheric lenses are assembled, and the yield of the existing assembly process is difficult to improve. Moreover, the total length of the system of 5mm or more is becoming more difficult to satisfy the demand for miniaturization of electronic devices. Especially, when the optical lens is used for fingerprint identification, the optical lens in the prior art has more lenses and a long system, which is not beneficial to the integration of a fingerprint identification device, such as an off-screen fingerprint identification device.

For the above reasons, the inventors have found that the superlens can solve the existing disadvantages, and therefore, the inventors propose a two-piece optical lens.

Hereinafter, exemplary embodiments according to the present application will be described with reference to the accompanying drawings.

Referring to fig. 1, the present application provides a two-piece optical lens, including:

a first and a second superlens 1 and 2 arranged in this order from the object side to the image side. The two-piece optical lens meets the following requirements:

28°≤HFOV≤61.9°；

f/D≤1.7；

TTL≤3.7mm；

1.1≤TTL/ImgH≤2.5；

wherein f is an effective focal length of the two-piece optical lens, D is an entrance pupil diameter of the two-piece optical lens, HFOV is a maximum half field angle of the two-piece optical lens, TTL is a total system length of the two-piece optical lens, and ImgH is a maximum imaging half height width.

Alternatively, in order to further compress the TTL of the two-piece optical lens while ensuring the imaging effect, either of the first and second superlenses 1 and 2 satisfies the following equation:

0.05mm≤d _m ≤2mm；

1.4≤n _m ≤1.6；

wherein d is _m Is the thickness of any one of the first and second superlenses 1, 2, n _m Is the effective refractive index of either the first superlens 1 or the second superlens 2.

According to an embodiment of the present application, optionally, the focal length of the first superlens 1 is greater than or equal to 10mm, and less than or equal to 12mm. Exemplarily, the focal length of the first superlens 1 is equal to 11.14mm. In further alternative embodiments, the focal length of the second superlens 2 is greater than or equal to 1.4mm, and less than or equal to 2.8mm. Exemplarily, the focal length of the second superlens 2 is equal to 1.4mm.

The superlens is a supersurface, which is a layer of sub-wavelength artificial nanostructure film, and the amplitude, phase and polarization of incident light can be modulated by the nanostructure units disposed thereon, wherein it should be noted that the nanostructure 3 can be understood as a sub-wavelength structure containing all media or plasmons and capable of causing phase jump, and the nanostructure units are structural units centered on each nanostructure 3 obtained by dividing the superlens. The nanostructures 3 are periodically arranged on the substrate in the superlens, wherein the nanostructures 3 in each period constitute a superstructure unit, wherein the superstructure unit is in a close-packable pattern, such as a regular quadrangle, a regular hexagon, etc., each period comprises a group of nanostructures 3, and the vertices and/or the center of the superstructure unit may be provided with nanostructures 3, for example. In the case where the superstructure unit is a regular hexagon, at least one nanostructure 3 is disposed at each vertex and center position of the regular hexagon. Alternatively, in the case where it is a square, each vertex and central position of the square is provided with at least one nanostructure 3. Ideally, the superstructure unit should be a hexagon with nano structures 3 arranged at the vertexes and the center, or a square with nano structures 3 arranged at the vertexes and the center, and it should be understood that the practical product may have the loss of the nano structures 3 at the edge of the superlens due to the limitation of the superlens shape, so that the superlens does not satisfy the complete hexagon/square. Specifically, as shown in fig. 7, the superstructure units are formed by regularly arranging the nanostructures 3, and a plurality of superstructure units are arranged in an array to form a super surface structure.

As shown in the left part of fig. 7, the superstructure unit comprises a central nanostructure 3 and 6 peripheral nanostructures 3 surrounding the central nanostructure at the same distance, and the peripheral nanostructures 3 are uniformly distributed along the periphery to form a regular hexagon, which can also be understood as a combination of regular triangles formed by a plurality of nanostructures 3.

As one example shown in the middle part of fig. 7, a superstructure unit comprises one central nanostructure 3 and 4 peripheral nanostructures 3 surrounding it at equal distances, making up a square.

The superstructure units and their close-packed/array may also be in the form of a circumferentially arranged sector, as shown in the right part of fig. 7, comprising two arc-shaped sides, or in the form of a sector of one arc-shaped side, as shown in the lower left corner region in the right part of fig. 7, with nanostructures 3 disposed at the intersection points of the sides and at the center of the sector.

In addition, for the sake of brevity and clarity, only the nanostructures 3 disposed at the centers of the superstructure units are drawn in the drawings of the embodiments, and it is understood that the nanostructures 3 may be disposed at the vertices/intersections of the outlines and/or at the center positions of the hexagons, squares, and sectors in the drawings.

It should be added that the nanostructure 3 may also adopt a polarization dependent structure or a polarization independent structure, for example, in one of the embodiments, the nanostructure 3 is a polarization dependent structure including a nanoelliptic cylinder and/or a nanofin, and the apex and/or the center of the superstructure unit is provided with the polarization independent structure. Or the nanostructure 3 is a polarization independent structure which comprises a nanometer cylinder or a nanometer square column, and the polarization independent structure is arranged at the vertex and/or the central position of the superstructure unit.

In one embodiment, the nanostructures 3 are nanopillar structures; optionally, the columnar structure includes one or more of a positive nanorod structure, a negative nanorod structure, a hollow nanorod structure, a negative hollow nanorod structure, or a topological nanorod structure. For example, taking a positive nano-pillar as an example for description, the nano-structure 3 material is transparent in a 400-700nm waveband, for example; alternatively, the material of the nanostructure 3 includes: silicon oxide, aluminum oxide, silicon nitride, titanium oxide, gallium nitride. By way of example, the present embodiment is described with the alumina-based nanostructures 3 as an example. It will be appreciated that the material of the nanostructures 3 may be chosen to be otherwise transparent in the operating band of the superlens. The cross section of the nano-pillar structure can be in one or more of a circle, an ellipse, a quadrangle, a pentagon, a hexagon and other polygonal shapes or topological shapes. In an example, the present embodiment is described by taking a positive nanorod with a circular cross section as an example, and referring to fig. 8.

The geometrical size of the nano-pillar array structure comprises the height H of the nano-pillars, the diameter D' of the cross section and the distance between the nano-pillars, and all the parameters are selected according to the requirement of fingerprint detection. In one embodiment, such as in the visible band, the height H of the nanopillar structures of the superlens is greater than or equal to 300nm and less than or equal to 2000nm; the minimum size (diameter, side length and/or minimum spacing between two adjacent nano-pillar structures and the like) of the nano-pillar structure is greater than or equal to 80nm; the maximum aspect ratio of the nano-pillar structures, i.e. the ratio of the height of the nano-pillar structures to the minimum diameter of the nano-pillar structures in the superlens, is less than or equal to 20. The cross section diameters D' of the nano-pillar structures at different positions are partially the same or different from each other; the structure periods of the nano-pillar structures at different positions are the same; the optical phase of the nanostructure 3 is related to the diameter D' of the cross section of the nanopillar; illustratively, the heights of the nano-pillar structures at different positions are all 900nm, the distance between the centers of the adjacent nano-pillar structures is 550nm, and the cross-sectional diameter D' of the nano-pillar is greater than or equal to 80nm and less than or equal to 470nm. It will be appreciated that the geometry and dimensions of the nano-pillar structures may be other choices that meet the detection requirements and processing conditions.

The shape of the super lens is round or square; optionally, the diameter size of the circular super lens is greater than or equal to 0.5mm and less than or equal to 3mm; the side length of the square super lens is greater than or equal to 0.5mm and less than or equal to 3mm. In the target waveband range, the mirror light phase of the superlens meets the positive lens distribution without chromatic aberration:

wherein λ is the wavelength of light wave, r is the distance from each nano-pillar structure to the center of the substrate, f _m Is the focal length of any one of the first and second superlenses 1 and 2. The wavelength lambda is any wavelength in a target waveband of the superlens; in one embodiment, a superlens with a target wavelength range of 400-700nm is used as an example, and the wavelength λ is any wavelength within a range of 400nm or more and 700nm or less.

In one embodiment, the phase distribution of any superlens for increasing the field angle satisfies at least one of the following equations:

wherein r is the distance from the center of the superlens to the nanostructure, λ is the working wavelength,

for any phase associated with a wavelength, x and y are the superlens mirror coordinates, f _m Is the focal length of any one of the first and second superlenses 1, 2, a _i And b _i Are real number coefficients.

In the present application, the first and second superlenses 1 and 2 are configured to correct aberrations, such as spherical aberration, chromatic aberration, distortion, and the like, by the phase distribution of the nanostructures 3 provided thereon. According to an embodiment of the present application, in an alternative embodiment, the first and second superlenses 1, 2 are capable of aberration correction, and the two superlenses are capable of wafer level packaging.

The application also provides a fingerprint identification device, which comprises the two-piece optical lens and the photoelectric sensor provided by the embodiment, wherein the photoelectric sensor is arranged on the image surface 5 of the two-piece optical lens. The photosensor may be a Complementary Metal Oxide Semiconductor (CMOS) or a Charge Coupled Device (CCD). The optical fingerprint identification principle is that light is emitted to a fingerprint by a light source, the fingerprint comprises ridges and valleys, when the light is irradiated to the valleys through glass, the light is totally reflected on an interface between the glass and air, so that the light can be collected to the CMOS sensor through an optical fingerprint identification lens, the light emitted to the ridges is not totally reflected, the light is absorbed by contact surfaces of the ridges and the glass or is emitted to other positions through diffuse reflection, and therefore fingerprint patterns are displayed on the CMOS sensor.

According to the embodiment of the present application, the fingerprint recognition device further includes an optical filter 4. The optical filter 4 is arranged between the two-piece optical lens and the photoelectric sensor on the optical path and is used for filtering stray light so as to improve the signal-to-noise ratio of the fingerprint identification device. According to an embodiment of the present application, the fingerprint identification apparatus further includes a diaphragm disposed at an object side of the two-piece optical lens, for preventing stray light interference. Preferably, the diaphragm may be a grid diaphragm for preventing crosstalk of light reflected by fingerprints at different positions.

On the optical path, the first superlens 1 in the two-piece optical lens is used to receive and modulate light reflected by a finger and passing through a diaphragm, wherein the diaphragm can effectively prevent crosstalk of light. The second super lens 2 and the first super lens 1 jointly modulate or one of the two is used for correcting the aberration of light, the light is projected to the optical filter 4 through the second super lens 2 and then converged on a single image surface 5 on the side, away from the first super lens 1, of the optical filter 4, and a plurality of sensors or a sensor array can be arranged on the image surface 5 to receive the light on the image surface 5.

According to the present embodiment, in an alternative embodiment, an optical system is provided, which includes a substrate with a near-infrared operating band, two opposite surfaces of the substrate are respectively provided with two different-structured nanostructures 3, and a superstructure unit formed by the two different-structured nanostructures 3, specifically, two different-structured nanostructures 3 are respectively provided on an incident light surface and an emergent light surface of the substrate.

As shown in fig. 2, the present application also provides an electronic device including the fingerprint identification apparatus provided in the foregoing embodiment. The detection light reflected by the fingerprint is modulated by the two-piece optical lens provided by the embodiment and then forms an image on the photosensitive surface of the photoelectric sensor, the photosensitive surface can sense the optical signal of the target waveband and converts the optical signal into an electric signal to output a fingerprint image for post processing, and the post processing mainly matches the fingerprint image with the fingerprint image stored in a system database through the existing image comparison technology to judge whether to unlock the fingerprint. In fig. 2, the fingerprint identification device provided in the embodiment of the present application may be disposed below the display screen.

When a user's fingerprint or other object with fingerprint information contacts the protection screen, a detection light source in the electronic device irradiates the protection screen, such as an OLED (organic light emitting semiconductor) pixel light source or an infrared light source, light with fingerprint information is transmitted to the sensor along the fingerprint identification optical system 6 through the two superlenses, and the fingerprint information is identified by the sensor, so that fingerprint unlocking or other operations are realized.

Example 1

In one specific embodiment, the parameters of the two-piece optical lens provided in the embodiment of the present application are as follows:

TABLE 1

Content providing method and apparatus	Parameter(s)
		Working wave band (WL)	VIS(525±10nm)
Equivalent Focal Length (EFL)	1.40mm
		Half field angle (omega)	61.9°
F number	1.44
		Back Focal Length (BFL)	0.97mm
Total system length (TTL)	3.67mm

Wherein, TTL refers to the distance from the stop to the single image plane.

For the optical system for fingerprint recognition, the parameters of each surface are as follows:

TABLE 2

The spherical surface in the above table represents a plane, and the spherical surface is a plane under the condition that the radius of the spherical surface is infinite. The optical system set based on the above parameters, for example, in one of the embodiments, has the effects as shown in fig. 3 and fig. 4, the left side of fig. 3 is the field curvature of the fingerprint recognition optical system 6, the right side of fig. 3 is the distortion of the fingerprint recognition optical system 6, and fig. 4 is the MTF (modulation transfer function) of the fingerprint recognition optical system 6. From fig. 3 and 4, it can be seen that the maximum curvature of field in the present application is not more than 2mm, the maximum distortion is 12%, and the resolution exceeds 35% at the spatial frequency of 50 lp/mm.

In another embodiment, the parameters of the two superlenses are set to: f. of ₁ ＝11.14mm，f ₂ =1.40mm, the effect diagrams are shown in fig. 5 and 6, where the left side of fig. 5 shows the field curvature of the optical fingerprint identification system 6, the right side of fig. 5 shows the distortion of the optical fingerprint identification system 6, and fig. 6 shows the MTF of the optical fingerprint identification system 6.

In summary, the two-piece optical lens provided in the embodiment of the present application, through the two superlenses sequentially arranged, not only provides a large field angle, but also effectively reduces the total length of the optical system, thereby effectively reducing the overall space occupancy rate of the optical system; the super lens replaces a plurality of aspheric lenses in the traditional process, so that the TTL of the optical system is effectively reduced, and the super lens is lower in mass production cost compared with the plurality of aspheric lenses.

It should be noted that the superlens provided by the embodiment of the present application can be processed by a semiconductor process, and has the advantages of light weight, thin thickness, simple structure and process, low cost, high consistency of mass production, and the like.

The above description is only a specific implementation of the embodiments of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the embodiments disclosed in the present application, and all the changes or substitutions should be covered by the scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims (12)

1. A two-piece optical lens for fingerprint identification, characterized by comprising a first super lens (1) and a second super lens (2) in sequence from an object side to an image side;

wherein, the two-piece optical lens satisfies:

28°≤HFOV≤61.9°；

f/D≤1.7；

TTL≤3.7mm；

1.1≤TTL/ImgH≤2.5；

wherein f is an effective focal length of the two-piece optical lens, D is an entrance pupil diameter of the two-piece optical lens, HFOV is a maximum half field angle of the two-piece optical lens, TTL is a total system length of the two-piece optical lens, and ImgH is a maximum imaging half height width.

2. Two-piece optical lens according to claim 1, characterized in that either of the first superlens (1) and the second superlens (2) satisfies the following equation:

0.05mm≤d _m ≤2mm；

1.4≤n _m ≤1.6；

wherein d is _m Is the thickness of any one of the first and second superlenses (1, 2), n _m Is the effective refractive index of any one of the first superlens (1) and the second superlens (2).

3. Two-piece optical lens according to claim 1, characterized in that the phase profile of any one of the first superlens (1) and the second superlens (2) satisfies at least one of the following formulae:

wherein r is the distance from the center of the first superlens (1) or the second superlens (2) to the nanostructure, and lambda is the working wavelength,

For any phase associated with the wavelength, x and y are the superlens mirror coordinates, f _m Is the focal length of either the first superlens (1) or the second superlens (2), a _i And b _i Are real number coefficients.

4. Two-piece optical lens according to any one of claims 1 to 3, characterised in that the operating band of the first superlens (1) and the second superlens (2) is the near infrared band or the visible band.

5. Two-piece optical lens according to any one of claims 1 to 3, characterised in that the focal length of the first superlens (1) is greater than or equal to 10mm and less than or equal to 12mm.

6. Two-piece optical lens according to claim 5, characterised in that the focal length of the first superlens (1) is equal to 11.14mm.

7. Two-piece optical lens according to any one of claims 1 to 3, characterised in that the focal length of the second superlens (2) is greater than or equal to 1.4mm and less than or equal to 2.8mm.

8. Two-piece optical lens according to claim 7, characterized in that the focal length of the second superlens (2) is equal to 1.4mm.

9. A fingerprint recognition device, comprising:

the two-piece optical lens of any one of claims 1-8; and

And the photoelectric sensor is arranged on the image surfaces of the two-piece optical lens.

10. The fingerprint recognition device according to claim 9, characterized in that the fingerprint recognition device further comprises an optical filter (4);

the optical filter (4) is arranged between the two-piece optical lens and the photoelectric sensor on an optical path.

11. The fingerprint recognition device according to claim 9 or 10, wherein the fingerprint recognition device further comprises an aperture;

the diaphragm is arranged on the object side of the two-piece optical lens.

12. An electronic device, comprising:

the fingerprint recognition device according to any one of claims 9 to 11.

Images