CN113917655A - Optical lens, fingerprint identification module and electronic equipment - Google Patents
Optical lens, fingerprint identification module and electronic equipment Download PDFInfo
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- CN113917655A CN113917655A CN202111112276.5A CN202111112276A CN113917655A CN 113917655 A CN113917655 A CN 113917655A CN 202111112276 A CN202111112276 A CN 202111112276A CN 113917655 A CN113917655 A CN 113917655A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 168
- 238000003384 imaging method Methods 0.000 claims description 27
- 238000001914 filtration Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 6
- 230000014509 gene expression Effects 0.000 description 5
- 201000009310 astigmatism Diseases 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
Abstract
The invention provides an optical lens, a fingerprint identification module and electronic equipment, wherein the optical lens comprises a plurality of lenses, and the plurality of lenses comprise: a first lens, an object side surface and an image side surface of which are concave along an optical axis of the optical lens; a second lens, an object side surface of which is convex along the optical axis; and a third lens whose object side surface and image side surface are convex along the optical axis, wherein the first lens to the third lens are sequentially arranged in a direction from an object side of the optical lens to an image plane of the optical lens.
Description
Technical Field
The application relates to the field of optics, especially, relate to an optical lens, fingerprint identification module and electronic equipment.
Background
With the development of full-screen, fingerprint identification has become the basic configuration of the display screen of the mobile phone. However, the volume of the optical lens in the current market is large, and is limited by the number of lenses constituting the optical system, the processing size of the lenses, and the like, so that the pursuit of miniaturization of the fingerprint lens in the mobile phone cannot be met, and the volume of the fingerprint lens and the size of the sensor circulating in the current market still occupy space due to overlarge size. In order to better match the internal space of the mobile phone, a miniaturized optical lens is urgently needed to meet the requirement of the mobile phone market on the optical fingerprint lens.
The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that forms no part of the prior art nor is it prior art that may be taught to one of ordinary skill in the art.
Disclosure of Invention
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
In order to solve the problem that the volume of a fingerprint lens circulated in the market occupies too large space, the invention provides an optical lens, a fingerprint identification module and electronic equipment, which can realize the compact structure and miniaturization of the optical lens under the condition of ensuring the imaging performance.
A first aspect of the present invention provides an optical lens, wherein the optical lens includes a plurality of lenses including: a first lens, an object side surface and an image side surface of which are concave along an optical axis of the optical lens; a second lens, an object side surface of which is convex along the optical axis; and a third lens whose object side surface and image side surface are convex along the optical axis, wherein the first lens to the third lens are sequentially arranged in a direction from an object side of the optical lens to an image plane of the optical lens.
In the first aspect, the first lens has a negative refractive power.
In the first aspect, the second lens has a positive refractive power.
In the first aspect, the third lens has a positive refractive power.
In the first aspect, the optical lens further includes a stop disposed between the first lens and the second lens.
In the first aspect, 5< TTL/f < 8, where TTL is a distance on the optical axis from an intersection point of an object side surface of the first lens element and the optical axis to the imaging plane, and f is a total focal length of the optical lens.
In a first aspect, 120 ° < fov <140 °, where fov is the angle of view of the optical lens.
In the first aspect, -1 < f1/f 2< 0, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.
In the first aspect, -2 < f1/f 3< -1, where f1 is the focal length of the first lens and f3 is the focal length of the third lens.
In the first aspect, 0< f1+ f 2< 0.9, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.
In the first aspect, -0.8 < f1+ f 3< 0, where f1 is the focal length of the first lens and f3 is the focal length of the third lens.
In the first aspect, 1.5< ND1<1.7, 1.5< ND2<1.7, 1.5< ND3<1.7, wherein ND1, ND2, and ND3 are refractive indices of the first lens, the second lens, and the third lens, respectively.
In the first aspect, 50< VD1<70, 50< VD2<70, 50< VD3<70, wherein VD1, VD2, and VD3 are abbe numbers of the first lens, the second lens, and the third lens, respectively.
In the first aspect, the plurality of lenses is three lenses.
In the first aspect, 1.3 < BFL/f < 1.4, where BFL is a distance on the optical axis from an intersection of the image side surface of the third lens element and the optical axis to an image plane, and f is a total focal length of the optical lens.
In the first aspect, 3.9 < IMGH/f < 4, where IMGH is a diagonal length of an effective imaging area of an imaging plane of the optical lens, and f is a total focal length of the optical lens.
In the first aspect, 1.2< F-number < 1.6.
A second aspect of the present invention provides a fingerprint identification module, wherein the fingerprint identification module comprises an image sensor and the optical lens as described above, and the image sensor is disposed on the image side of the optical lens.
In the second aspect, the fingerprint identification module further comprises an infrared filter, and the infrared filter is arranged above the image sensor and used for filtering infrared light entering the image sensor.
A third aspect of the present invention provides an electronic device, where the electronic device includes a display screen and the fingerprint identification module as described above, and the display screen is disposed on an object side of the optical lens.
According to the optical lens, the fingerprint identification module and the electronic equipment, the optical lens can be compact in structure and miniaturized under the condition that the imaging performance is guaranteed.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a diagram illustrating a first example of an electronic apparatus having an optical lens.
Fig. 2 shows an astigmatism curve of the optical lens shown in fig. 1.
Fig. 3 shows distortion curves of the optical lens shown in fig. 1.
Fig. 4 presents MTF curves of the optical lens shown in fig. 1.
Fig. 5 is a diagram illustrating a second example of an electronic apparatus having an optical lens.
Fig. 6 shows astigmatism curves of the optical lens shown in fig. 5.
Fig. 7 shows distortion curves of the optical lens shown in fig. 5.
Fig. 8 presents MTF curves of the optical lens shown in fig. 5.
Icon: 100-a display screen; 110-a first lens; 120-a second lens; 130-a third lens; 140-a filter; 150-an image sensor; 210-a first lens; 220-a second lens; 230-a third lens; 240-a filter; 250-an image sensor; STO-stop.
Detailed Description
The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, devices, and/or systems described herein. However, various alternatives, modifications, and equivalents of the methods, apparatus, and/or systems described herein will be apparent to those skilled in the art in view of the disclosure of the present application. For example, the order of operations described herein is merely an example, which is not limited to the order set forth herein, but rather, variations may be made in addition to operations which must occur in a particular order, which will be apparent upon understanding the disclosure of the present application. Moreover, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.
The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and/or systems described herein that will be apparent after understanding the disclosure of the present application.
Biometric technology has been widely applied to various terminal devices or electronic apparatuses. Biometric identification techniques include, but are not limited to, fingerprint identification, palm print identification, vein identification, iris identification, face identification, biometric identification, anti-counterfeiting identification, and the like. Among them, fingerprint recognition generally includes optical fingerprint recognition, capacitive fingerprint recognition, and ultrasonic fingerprint recognition. With the rise of the full screen technology, the fingerprint identification module can be arranged in a local area or a whole area below the display screen, so that Under-screen (Under-display) optical fingerprint identification is formed; or, can also be with inside partly or the whole display screen that integrates to electronic equipment of optical fingerprint identification module to form the optical fingerprint identification In-screen (In-display). The Display screen may be an Organic Light Emitting Diode (OLED) Display screen or a Liquid Crystal Display (LCD) screen, or the like. Fingerprint identification methods generally include the steps of fingerprint image acquisition, preprocessing, feature extraction, feature matching, and the like. Part or all of the steps can be realized by a traditional Computer Vision (CV) algorithm, and also can be realized by an Artificial Intelligence (AI) -based deep learning algorithm. The fingerprint identification technology can be applied to portable or mobile terminals such as smart phones, tablet computers and game equipment, and other electronic equipment such as smart door locks, automobiles and bank automatic teller machines, and is used for fingerprint unlocking, fingerprint payment, fingerprint attendance, identity authentication and the like.
A first aspect of the present disclosure provides an optical lens that can achieve miniaturization while ensuring imaging performance.
In the embodiment of the present application, the first lens is a lens closest to an object (or an object), and the third lens is a lens closest to an imaging plane (or an image sensor). Further, in the present application, the radius of curvature of the lens, the effective radius and the thickness, the distance (TTL) from the object side surface of the first lens to the imaging plane, the diagonal length (IMGH) of the effective imaging area of the imaging plane, and the focal length are all expressed in millimeters (mm).
Further, the thickness of the lenses, the distance between the lenses, and TTL are distances measured based on the optical axes of the lenses. Further, in the description of the shape of the lens, the expression that one surface of the lens is convex along the optical axis means that the paraxial region of the corresponding surface is convex, and the expression that one surface of the lens is concave along the optical axis means that the paraxial region of the corresponding surface is concave. Therefore, even when one surface of the lens is described as convex, the edge portion of the one surface of the lens may be concave. Also, even when one surface of the lens is described as concave, an edge portion of the one surface of the lens may be convex.
The optical lens includes three lenses. For example, the optical lens includes a first lens, a second lens, and a third lens that are sequentially arranged from an object side of the optical lens.
The object side surface of the first lens is concave along the optical axis and the image side surface of the first lens is concave along the optical axis. For example, the first lens has a negative refractive power.
The first lens may have an aspheric surface, such as an even-order aspheric surface. For example, both surfaces of the first lens are aspherical. The first lens may be formed using a material having high light transmittance and excellent workability. For example, the first lens is formed using plastic. The refractive index of the first lens is greater than 1.5 and less than 1.7.
The object side surface of the second lens is convex along the optical axis. For example, the second lens has a positive refractive power.
The second lens may have an aspheric surface, such as an even-order aspheric surface. For example, both surfaces of the second lens are aspherical. The second lens may be formed using a material having high light transmittance and excellent workability. For example, the second lens is formed using plastic. The refractive index of the second lens is greater than 1.5 and less than 1.7.
An object side surface of the third lens is convex along the optical axis, and an image side surface of the third lens is convex along the optical axis. For example, the third lens has a positive refractive power.
The third lens may have an aspherical surface. For example, both surfaces of the third lens are aspherical. The third lens may be formed using a material having high light transmittance and excellent workability. For example, the third lens is formed using plastic. The refractive index of the third lens is greater than 1.5 and less than 1.7.
Any aspherical surface of the first lens to the third lens can be expressed by the following equation:
wherein Z is a rise of a distance from an aspheric vertex at a position having a height r in the optical axis direction of the aspheric surface, c represents a vertex curvature of the aspheric surface, k is a conic coefficient, and a2, a3, a4, a5, and a6 are high-order aspheric coefficients.
The optical lens may have a positive refractive power. That is, the combined focal length of the optical lens including the first lens, the second lens, and the third lens has a positive value. In some embodiments, the optical lens may also include a filter and/or a diaphragm.
The filter may be disposed on an image side of the third lens, and the filter may be disposed between the third lens and an image sensor as described below. The filter blocks part of the wavelength of light so that a clear image can be realized. For example, the filter is an infrared filter for blocking light of an infrared wavelength.
The diaphragm is arranged to control the amount of light incident on the lens. According to various embodiments, a diaphragm may be disposed between two adjacent lenses. For example, the diaphragm may be disposed between the first lens and the second lens.
The second aspect of the present disclosure further relates to a fingerprint identification module, wherein the fingerprint identification module includes the optical lens and the image sensor of the first aspect, and the image sensor is disposed on the image side of the optical lens. The image sensor may form an imaging plane. For example, the surface of the photosensitive pixel array of the image sensor may form an imaging plane.
The fingerprint identification module further comprises an infrared filter, the infrared filter is arranged above the image sensor and used for filtering infrared light entering the image sensor
The third aspect of the present disclosure further relates to an electronic device, wherein the electronic device includes a display screen and the fingerprint identification module as described above, and the display screen is disposed on the object side of the optical lens. Here, the electronic device may be a portable or mobile terminal such as a mobile phone, a tablet computer, a game device, and the like. In electronic equipment, the fingerprint identification module sets up in the below of display screen for receive the light beam that carries fingerprint information, optical lens in the fingerprint identification module is used for leading the light beam of incidenting to image sensor, image sensor converts the light beam into fingerprint signal and based on fingerprint signal obtains the fingerprint image. In an embodiment, the display screen may provide a light source for the finger that illuminates the finger and reflects a light beam carrying the light signal.
In this optical lens, fingerprint identification module, the electronic equipment that this disclosure relates to, can satisfy following conditional expression:
in some embodiments, 5< TTL/f < 8.
In some embodiments, 120 ° < fov <140 °.
In some embodiments, -1 < f1/f 2< 0.
In some embodiments, -2 < f1/f 3< -1.
In some embodiments, 0< f1+ f 2< 0.9.
In some embodiments, -0.8 < f1+ f 3< 0.
In some embodiments, 1.5< ND1<1.7, 1.5< ND2<1.7, 1.5< ND3< 1.7.
In some embodiments, 50< VD1<70, 50< VD2<70, 50< VD3< 70.
In some embodiments, 1.2< F-number < 1.6.
In some embodiments, 1.3 < BFL/f < 1.4.
In some embodiments, 3.9 < IMGH/f < 4.
In the above expression, TTL is a distance on an optical axis from an intersection point of an object side surface of a first lens and an optical axis to an imaging plane, F is a total focal length of the optical lens, fov is a field angle of the optical lens, IMGH is a diagonal length of an effective imaging area of an imaging plane of the optical lens, where the effective imaging area is an area of a photosensitive pixel of a sensor, BFL is a distance from an intersection point of an image side surface of a third lens and the optical axis to the imaging plane, F1 is a focal length of the first lens, F2 is a focal length of the second lens, F3 is a focal length of the third lens, ND1, ND2, and ND3 are refractive indices of the first lens, the second lens, and the third lens, respectively, VD1, VD2, and VD3 are abbe numbers of the first lens, the second lens, and the third lens, respectively, an F number is a reciprocal of a relative aperture of the optical lens, and a relative aperture diameter is an entrance pupil/focal length, that is, F-number is the focal length/entrance pupil diameter, and the F-number indicates the magnitude of the amount of light entering the optical lens.
Here, according to 5< TTL/f < 8, the optical lens can be further miniaturized while ensuring imaging performance. Further, according to 120 ° < fov <140 °, an ultra wide angle of the optical lens can be realized.
Next, an electronic device according to several examples will be described.
First, an electronic apparatus according to a first example will be described with reference to fig. 1. Electronic equipment includes display screen 100 and fingerprint identification module, and display screen 100 sets up the object side at the fingerprint identification module. Wherein, fingerprint identification module includes optical lens and image sensor 150, and image sensor 150 sets up the image side at optical lens. The fingerprint identification module further comprises an infrared filter, wherein the infrared filter is arranged above the image sensor 150 and used for filtering infrared light entering the image sensor 150.
The optical lens according to the first example includes a first lens 110, a second lens 120, and a third lens 130.
The first lens 110 has a negative refractive power. As shown in fig. 1, the object side surface of the first lens 110 is concave along the optical axis, and the image side surface of the first lens 110 is concave along the optical axis. The object side surface of the second lens 120 is convex along the optical axis, and the image side surface of the second lens 120 is convex along the optical axis. The object side surface of the third lens 130 is convex along the optical axis, and the image side surface of the third lens 130 is convex along the optical axis.
The optical lens further includes a filter 140 and a stop STO. The filter 140 is disposed between the third lens 130 and the image sensor 150, and STO is disposed between the first lens 110 and the second lens 120.
The optical lens may be configured to realize a bright optical system. For example, the F-number of the optical lens is 1.46. The optical lens may have a super wide angle field of view (fov), the optical lens having an overall field of view of 136 °.
In the optical lens according to the first example, the focal length f1 of the first lens is-0.70 mm, the focal length f2 of the second lens is 1.07mm, the focal length f3 of the third lens is 0.63mm, the total focal length (effective focal length) f of the optical lens is 0.368mm, the distance TTL on the optical axis from the intersection point of the object side surface of the first lens and the optical axis to the imaging plane is 1.95mm, BFL is 0.50mm, and IMGH is 1.46 mm.
TABLE 1
Here, the conic coefficient is a higher-order term coefficient of the above formula.
Where OBJ represents an object side or an object, S01 and S02 represent, for example, the upper and lower surfaces of a display screen, respectively, S1 and S2 represent the object side surface and the image side surface of a first lens, respectively, STO represents a stop, S3 and S4 represent the object side surface and the image side surface of a second lens, respectively, S5 and S6 represent the object side surface and the image side surface of a third lens, respectively, S7 and S8 represent the object side surface and the image side surface of a filter, respectively, and S9 represents an imaging plane.
Fig. 2 presents astigmatism curves of the optical lens of the first example; fig. 3 presents distortion curves of the optical lens of the first example; fig. 4 presents MTF curves at different spatial frequencies for different image heights of the optical lens of the first example. Table 1 presents characteristics of lenses of the optical lens according to the first example.
An electronic apparatus according to a second example will be described with reference to fig. 5. Electronic equipment includes display screen 100 and fingerprint identification module, and display screen 100 sets up the object side at the fingerprint identification module. Wherein, fingerprint identification module includes optical lens and image sensor 250, and image sensor 250 sets up the image side at optical lens. The fingerprint identification module further comprises an infrared filter, wherein the infrared filter is arranged above the image sensor 250 and used for filtering infrared light entering the image sensor 250.
The optical lens according to the second example includes a first lens 210, a second lens 220, and a third lens 230.
The first lens 210 has a positive refractive power. As shown in fig. 5, the object side surface of the first lens 210 is concave along the optical axis, and the image side surface of the first lens 210 is concave along the optical axis. The object side surface of the second lens 220 is convex along the optical axis, and the image side surface of the second lens 220 is concave along the optical axis. The object side surface of the third lens 230 is convex along the optical axis, and the image side surface of the third lens 230 is convex along the optical axis.
The optical lens further includes a filter 240 and a stop STO. The filter 240 is disposed between the third lens 230 and the image sensor 250, and STO is disposed between the first lens 210 and the second lens 220.
The optical lens may be configured to realize a bright optical system. For example, the F-number of the optical lens is 1.38. The optical lens may have a super wide angle field of view (fov), the entire field of view of the optical lens being 133.8 °.
In the optical lens according to the second example, the focal length f1 of the first lens is-0.79 mm, the focal length f2 of the second lens is 1.31mm, the focal length f3 of the third lens is 0.477mm, the total focal length (effective focal length) f of the optical lens is 0.373mm, the distance on the optical axis from the intersection point of the object side surface of the first lens and the optical axis to the imaging plane TTL is 1.95mm, BFL is 0.49mm, and IMGH is 1.46 mm.
TABLE 2
Here, the effective radius is a clear aperture (radius through which light actually passes) of a corresponding surface of the optical lens, and the conic coefficient is a coefficient of a higher order term of the above formula.
Where OBJ represents an object side or an object, S01 and S02 represent, for example, the upper and lower surfaces of a display screen, respectively, S1 and S2 represent the object side surface and the image side surface of a first lens, respectively, STO represents a stop, S3 and S4 represent the object side surface and the image side surface of a second lens, respectively, S5 and S6 represent the object side surface and the image side surface of a third lens, respectively, S7 and S8 represent the object side surface and the image side surface of a filter, respectively, and S9 represents an imaging plane.
Fig. 6 presents astigmatism curves of the optical lens of the second example; fig. 7 presents distortion curves of the optical lens of the second example; fig. 8 presents MTF curves at different spatial frequencies for different image heights of the optical lens of the second example. Table 2 presents characteristics of lenses of the optical lens according to the second example.
Table 3 presents values of conditional expressions of the optical lenses according to the first to second examples.
TABLE 3
| Conditional formula/embodiment formula | 1 | 2 |
| TTL/f | 5.3 | 5.22 |
| FOV | 136° | 133.8° |
| f1/f2 | -0.65 | -0.60 |
| f1/f3 | -1.11 | -1.66 |
| f1+f2 | 0.37 | 0.52 |
| f1+f3 | -0.07 | -0.313 |
| ND1、VD1 | 1.54、55.9 | 1.54、55.9 |
| ND2、VD2 | 1.54、55.9 | 1.54、55.9 |
| ND3、VD3 | 1.64、55.9 | 1.64、55.9 |
| F number | 1.46 | 1.38 |
| BFL/f | 1.358 | 1.314 |
| IMGH/f | 3.97 | 3.91 |
According to the above examples, miniaturization of the optical lens can be achieved with ensuring imaging performance.
While the present disclosure includes particular examples, it will be apparent from an understanding of the present disclosure that various changes in form and detail may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only and not for purposes of limitation. The description of features or aspects in each example will be considered applicable to similar features or aspects in other examples. Suitable results may be obtained if the described techniques were performed in a different order and/or if components in the described systems, architectures, devices, or circuits were combined in a different manner and/or were replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is defined not by the detailed description but by the claims and their equivalents, and all changes within the scope of the claims and their equivalents are to be construed as being included in the present disclosure.
Claims (20)
1. An optical lens, comprising a plurality of lenses, the plurality of lenses comprising:
a first lens, an object side surface and an image side surface of which are concave along an optical axis of the optical lens;
a second lens, an object side surface of which is convex along the optical axis; and
a third lens whose object side surface and image side surface are convex along the optical axis,
the first lens to the third lens are sequentially arranged along the direction from the object space of the optical lens to the imaging surface of the optical lens.
2. An optical lens as claimed in claim 1, characterized in that the first lens has a negative refractive power.
3. An optical lens as claimed in claim 1, characterized in that the second lens has a positive refractive power.
4. An optical lens as claimed in claim 1, characterized in that the third lens has a positive refractive power.
5. An optical lens according to claim 1, characterized in that the optical lens further comprises a diaphragm disposed between the first lens and the second lens.
6. An optical lens barrel according to any one of claims 1 to 5, wherein 5< TTL/f < 8, where TTL is a distance on the optical axis from an intersection point of the object side surface of the first lens and the optical axis to the image plane, and f is a total focal length of the optical lens.
7. An optical lens according to any of claims 1 to 5, characterized in that 120 ° < fov <140 °, where fov is the angle of field of the optical lens.
8. An optical lens according to any one of claims 1 to 5, characterized in that-1 < f1/f 2< 0, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.
9. An optical lens according to any one of claims 1 to 5, characterized in that-2 < f1/f 3< -1, where f1 is the focal length of the first lens and f3 is the focal length of the third lens.
10. An optical lens according to any one of claims 1 to 5, characterized in that 0< f1+ f 2< 0.9, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.
11. An optical lens according to any of claims 1 to 5, characterized in that-0.8 < f1+ f 3< 0, where f1 is the focal length of the first lens and f3 is the focal length of the third lens.
12. The optical lens according to any one of claims 1 to 5,
1.5< ND1<1.7, 1.5< ND2<1.7, 1.5< ND3<1.7, wherein ND1, ND2 and ND3 are refractive indices of the first lens, the second lens and the third lens, respectively.
13. The optical lens according to any one of claims 1 to 5,
50< VD1<70, 50< VD2<70, 50< VD3<70, wherein VD1, VD2 and VD3 are the Abbe numbers of the first lens, the second lens and the third lens, respectively.
14. An optical lens according to any one of claims 1 to 5, characterized in that the plurality of lenses is three lenses.
15. An optical lens according to any one of claims 1 to 5, wherein 1.3 < BFL/f < 1.4, wherein BFL is a distance on the optical axis from an intersection point of an image side surface of the third lens and the optical axis to an imaging plane, and f is an overall focal length of the optical lens.
16. An optical lens according to any one of claims 1 to 5, wherein 3.9 < IMGH/f < 4, where IMGH is the diagonal length of the effective imaging area of the imaging plane of the optical lens, and f is the total focal length of the optical lens.
17. An optical lens according to any one of claims 1 to 5, characterized in that 1.2< F-number < 1.6.
18. A fingerprint recognition module comprising an optical lens according to any one of claims 1 to 17 and an image sensor, the image sensor being disposed on an image side of the optical lens.
19. The fingerprint recognition module of claim 18, further comprising an infrared filter disposed above the image sensor for filtering infrared light entering the image sensor.
20. An electronic device, comprising a display screen and the fingerprint recognition module according to claim 18 or 19, wherein the display screen is disposed on the object side of the optical lens.
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