CN214011614U

CN214011614U - Optical imaging lens and fingerprint identification device

Info

Publication number: CN214011614U
Application number: CN202120257948.0U
Authority: CN
Inventors: 谢丽; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-08-20
Anticipated expiration: 2031-01-29

Abstract

The application discloses an optical imaging lens and a fingerprint identification device comprising the same. The optical imaging lens sequentially comprises from an object side to an image side along an optical axis: a first lens having a negative refractive power, an object side surface of which is a concave surface; a second lens having a positive refractive power, the object-side surface of which is convex; and a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface. The total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following conditions: f/EPD is less than 1.65; the combined focal length f23 of the second lens and the third lens and the total effective focal length f of the optical imaging lens satisfy that: f23/f is more than 1.6 and less than 2.4; and at least one mirror surface of the object side surface of the first lens to the image side surface of the third lens is an aspherical mirror surface.

Description

Optical imaging lens and fingerprint identification device

Technical Field

The present disclosure relates to the field of optical elements, and in particular, to an optical imaging lens and a fingerprint recognition device having the optical imaging lens.

Background

Currently, with the development of the fingerprint identification technology under the screen, manufacturers of portable electronic products such as smart phones gradually begin to research how to apply the fingerprint identification technology under the screen to portable electronic products such as smart phones so as to improve the competitiveness of their products. Because the mobile phone screen such as an organic light-emitting diode (OLED) screen has better light transmittance, a fingerprint identification device under the screen can be installed below the OLED screen, and the fingerprint identification device under the screen can receive reflected light which is emitted by the OLED screen and is formed after being reflected by a finger to detect a fingerprint.

However, considering that the off-screen fingerprint recognition device needs to be matched with a corresponding optical imaging lens, the conventional optical imaging lens is easy to cause poor imaging quality when being loaded with the off-screen fingerprint recognition device due to factors such as large volume, small field angle, small aperture and the like, and further the working effect of the recognition device is easy to be influenced.

SUMMERY OF THE UTILITY MODEL

An aspect of the present application provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a first lens having a negative refractive power, an object side surface of which is a concave surface; a second lens having a positive refractive power, the object-side surface of which is convex; and a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface. The total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens can satisfy the following conditions: f/EPD is less than 1.65; and the combined focal length f23 of the second lens and the third lens and the total effective focal length f of the optical imaging lens can satisfy: f23/f is more than 1.6 and less than 2.4. At least one mirror surface of the object side surface of the first lens to the image side surface of the third lens is an aspherical mirror surface.

In one embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the total effective focal length f of the optical imaging lens may satisfy: 0.7 < (f1+ f2)/f < 1.9.

In one embodiment, the maximum field angle FOV of the optical imaging lens may satisfy: 120 < FOV < 140.

In one embodiment, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens, and the central thickness CT2 of the second lens on the optical axis satisfy: 1.8 < ImgH/CT2 < 4.0.

In one embodiment, the distance TTL between the object side surface of the first lens element and the imaging surface of the optical imaging lens on the optical axis and the central thickness CT3 of the third lens element on the optical axis satisfy: TTL/CT3 is more than 7.0 and less than 10.0.

In one embodiment, the effective half aperture DT11 of the object side surface of the first lens, the effective half aperture DT21 of the object side surface of the second lens, and the effective half aperture DT22 of the image side surface of the second lens may satisfy: 1.4 < DT11/(DT21+ DT22) < 2.1.

In one embodiment, the effective half aperture DT31 of the object side surface of the third lens and the effective half aperture DT21 of the object side surface of the second lens satisfy: 1.3 < DT21/DT31 < 2.6.

In one embodiment, the abbe number V1 of the first lens may satisfy: 50 < V1 < 70.

In one embodiment, the effective focal length f3 of the third lens, the radius of curvature R6 of the image-side surface of the third lens, and the radius of curvature R5 of the object-side surface of the third lens may satisfy: 0.1 < f3/(R5+ R6) < 1.1.

In one embodiment, a distance SAG11 on the optical axis from the intersection point of the object-side surface of the first lens and the optical axis to the effective radius vertex of the object-side surface of the first lens, a distance SAG12 on the optical axis from the intersection point of the image-side surface of the first lens and the optical axis to the effective radius vertex of the image-side surface of the first lens, and a distance T12 between the first lens and the second lens on the optical axis may satisfy: 1.2 < (SAG11+ SAG12)/T12 < 1.9.

In one embodiment, the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis may satisfy: 1.9 < ET1/CT1 < 2.5.

In one embodiment, the optical imaging lens further includes a stop, and a distance SL from the stop to an imaging surface of the optical imaging lens on the optical axis and a distance TTL from an object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis may satisfy: TTL/SL is more than 2.0 and less than 2.5.

In one embodiment, a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens on the optical axis and a distance BFL between an image side surface of the third lens element and the imaging surface of the optical imaging lens on the optical axis may satisfy: TTL/BFL is more than 2.7 and less than 3.4.

Another aspect of the present application further provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a first lens having a negative refractive power, an object side surface of which is a concave surface; a second lens having a positive refractive power, the object-side surface of which is convex; and a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface. The total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens can satisfy the following conditions: f/EPD is less than 1.65; and the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens can satisfy: 0.7 < (f1+ f2)/f < 1.9. At least one mirror surface of the object side surface of the first lens to the image side surface of the third lens is an aspherical mirror surface.

In one embodiment, the combined focal length f23 of the second lens and the third lens and the total effective focal length f of the optical imaging lens can satisfy: f23/f is more than 1.6 and less than 2.4.

The application also provides a fingerprint identification device. The fingerprint identification device includes: the optical imaging lens further includes a glass screen located at the object side; and an image sensor for converting an optical signal incident to the image sensor via the optical imaging lens into an electrical signal.

This application has adopted three lens, through the focal power of rational distribution each lens, face type, the center thickness of each lens and the epaxial interval between each lens etc for above-mentioned optical imaging lens has at least one beneficial effect such as big field of vision, miniaturization, big diaphragm and high imaging quality.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 shows a schematic structural view of an optical imaging lens according to embodiment 1 of the present application;

fig. 2A and 2B show an astigmatism curve and a distortion curve, respectively, of the optical imaging lens of embodiment 1;

fig. 3 is a schematic structural view showing an optical imaging lens according to embodiment 2 of the present application;

fig. 4A and 4B show an astigmatism curve and a distortion curve, respectively, of the optical imaging lens of embodiment 2;

fig. 5 is a schematic structural view showing an optical imaging lens according to embodiment 3 of the present application;

fig. 6A and 6B show an astigmatism curve and a distortion curve, respectively, of an optical imaging lens of embodiment 3;

fig. 7 is a schematic structural view showing an optical imaging lens according to embodiment 4 of the present application; and

fig. 8A and 8B show an astigmatism curve and a distortion curve, respectively, of an optical imaging lens of embodiment 4.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The features, principles, and other aspects of the present application are described in detail below.

An optical imaging lens according to an exemplary embodiment of the present application may include, for example, three lenses having optical powers, a first lens, a second lens, and a third lens. The three lenses are arranged along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the third lens can have a spacing distance therebetween.

In an exemplary embodiment, the first lens may have a negative optical power, and the object side surface thereof may be concave; the second lens can have positive focal power, and the object side surface of the second lens can be a convex surface; and the third lens has positive focal power, and the object side surface of the third lens can be a convex surface, and the image side surface of the third lens can be a convex surface.

In an exemplary embodiment, the aberration of the whole optical imaging lens can be effectively reduced by reasonably distributing the optical powers of the first lens, the second lens and the third lens, and the sensitivity of the optical imaging lens is reduced. The object side of the first lens is set to be a concave surface, the object side of the second lens is set to be a convex surface, and the third lens is set to be a convex surface type, so that the whole arrangement of the lens is facilitated, and the lens is more practical.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: f/EPD < 1.65, where f is the total effective focal length of the optical imaging lens and EPD is the entrance pupil diameter of the optical imaging lens. The f/EPD is less than 1.65, the light flux of the lens can be effectively increased, the relative illumination is improved, the identification precision of the lens is improved, and the imaging quality of the lens in a dark environment can be well improved.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 120 < FOV < 140, where FOV is the maximum field angle of the optical imaging lens. More specifically, the FOV may further satisfy: 125 < FOV < 131. The optical lens meets the condition that FOV is more than 120 degrees and less than 140 degrees, is beneficial to reducing the F number of the lens, can enable the lens to have a larger imaging range, and improves the identification range of the lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.7 < (f1+ f2)/f < 1.9, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f is the total effective focal length of the optical imaging lens. More specifically, f1, f2, and f further satisfy: 0.8 < (f1+ f2)/f < 1.9. Satisfy 0.7 < (f1+ f2)/f < 1.9, be favorable to promoting the imaging quality of camera lens, be favorable to reducing the sensitivity of camera lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.1 < f3/(R5+ R6) < 1.1, where f3 is an effective focal length of the third lens, R6 is a radius of curvature of an image-side surface of the third lens, and R5 is a radius of curvature of an object-side surface of the third lens. The requirements that f3/(R5+ R6) < 1.1 are met, the size of the lens can be effectively reduced, the focal power of the third lens can be reasonably distributed, the focal power is prevented from being excessively concentrated on the third lens, the aberration of other lenses can be corrected, and the third lens can keep better process processability.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.8 < ImgH/CT2 < 4.0, wherein ImgH is half of the diagonal length of the effective pixel region on the imaging plane of the optical imaging lens, and CT2 is the center thickness of the second lens on the optical axis. The requirements that ImgH/CT2 is more than 1.8 and less than 4.0 are met, the optical imaging lens is favorable for realizing the ultra-thinness and high pixel, and therefore the optical imaging lens can be better suitable for more and more ultra-thin electronic products in the market.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 7.0 < TTL/CT3 < 10.0, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis. More specifically, TTL and CT3 further satisfy: 7.1 < TTL/CT3 < 9.7. The lens meets the requirements that TTL/CT3 is more than 7.0 and less than 10.0, the longitudinal spherical aberration of the lens and the ghost image at the center of an image surface can be improved, the stability of the lens structure can be enhanced, the chromatic aberration and distortion of the lens can be effectively balanced, and the difficulty in the aspect of processing technology caused by the fact that the lens is too thin can be avoided.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.4 < DT11/(DT21+ DT22) < 2.1, where DT11 is the effective half aperture of the object side surface of the first lens, DT21 is the effective half aperture of the object side surface of the second lens, and DT22 is the effective half aperture of the image side surface of the second lens. More specifically, DT11, DT21 and DT22 may further satisfy: 1.4 < DT11/(DT21+ DT22) < 2.0. The requirements of 1.4 < DT11/(DT21+ DT22) < 2.1 are met, the light flux of the lens can be effectively increased, the relative illumination of the whole field of view of the lens, particularly the edge field of view of the lens, is improved, and the lens still has good imaging quality in a dark environment.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.3 < DT21/DT31 < 2.6, wherein DT31 is the effective half aperture of the object side surface of the third lens and DT21 is the effective half aperture of the object side surface of the second lens. The requirements that DT21/DT31 is more than 1.3 and less than 2.6 are met, the light transmission quantity of the lens can be effectively increased, the relative illumination of the whole visual field, particularly the marginal visual field, of the lens is improved, and the lens still has good imaging quality in a dark environment.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 50 < V1 < 70, wherein V1 is the Abbe number of the first lens. More specifically, V1 further satisfies: 55 < V1 < 58. V1 is more than 50 and less than 70, which is beneficial to effectively eliminating chromatic aberration of the optical imaging lens and improving the image plane definition.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.6 < f23/f < 2.4, wherein f23 is the combined focal length of the second lens and the third lens, and f is the total effective focal length of the optical imaging lens. Satisfying 1.6 < f23/f < 2.4, the focal power of the lens can be more distributed on the second lens and the third lens, the aberration correction capability of the lens can be well improved, and the size of the lens can be effectively reduced.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.2 < (SAG11+ SAG12)/T12 < 1.9, wherein SAG11 is 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 effective radius vertex of the object side surface of the first lens, SAG12 is the distance on the optical axis from the intersection point of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens, and T12 is the spacing distance on the optical axis between the first lens and the second lens. More specifically, SAG11, SAG12, and T12 may further satisfy: 1.3 < (SAG11+ SAG12)/T12 < 1.8. Satisfy 1.2 < (SAG11+ SAG12)/T12 < 1.9, be favorable to adjusting optical imaging lens's chief ray angle, can effectively improve optical imaging lens's relative luminance, promote image plane definition.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.9 < ET1/CT1 < 2.5, wherein ET1 is the edge thickness of the first lens and CT1 is the central thickness of the first lens on the optical axis. More specifically, ET1 and CT1 further satisfy: 2.0 < ET1/CT1 < 2.5. The thickness sensitivity of the lens can be reduced and the curvature of field of the lens can be corrected by meeting the requirement that ET1/CT1 is more than 1.9 and less than 2.5.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: and 2.7 < TTL/BFL < 3.4, wherein TTL is the distance from the object side surface of the first lens element to the imaging surface of the optical imaging lens on the optical axis, and BFL is the distance from the image side surface of the third lens element to the imaging surface of the optical imaging lens on the optical axis. The requirements that TTL/BFL is more than 2.7 and less than 3.4 are met, and the ultrathin optical imaging lens and the high pixel are facilitated to be realized.

In an exemplary embodiment, an optical imaging lens according to the present application further includes a stop disposed between the second lens and the third lens. The optical imaging lens according to the present application can satisfy: 2.0 < TTL/SL < 2.5, wherein SL is the distance between the diaphragm and the imaging surface of the optical imaging lens on the optical axis, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis. More specifically, TTL and SL may further satisfy: TTL/SL is more than 2.0 and less than 2.3. The TTL/SL is more than 2.0 and less than 2.5, the imaging effect of a large image plane is favorably realized, and the optical performance of the lens is further improved.

In an exemplary embodiment, an optical imaging lens according to the present application further includes a glass screen disposed between the object side and the first lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on the imaging surface.

The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above three lenses. By reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, incident light can be effectively converged, the optical total length of the imaging lens is reduced, the machinability of the imaging lens is improved, and the optical imaging lens is more beneficial to production and processing. The present application proposes an optical imaging lens having characteristics such as miniaturization, a large angle of view, a large aperture, and high imaging quality. The optical imaging lens according to the application can be used for an under-screen fingerprint identification device. The under-screen fingerprint identification device provided with the optical imaging lens has the advantages of high identification precision, wide identification range and the like.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the third lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object-side surface and the image-side surface of each of the first lens, the second lens, and the third lens is an aspheric mirror surface. Optionally, the object-side surface and the image-side surface of each of the first lens, the second lens, and the third lens are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses constituting an optical imaging lens may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although three lenses are exemplified in the embodiment, the optical imaging lens is not limited to including three lenses. The optical imaging lens may also include other numbers of lenses, if desired.

Specific examples of an optical imaging lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1 to 2B. Fig. 1 shows a schematic structural diagram of an optical imaging lens according to embodiment 1 of the present application.

As shown in fig. 1, the optical imaging lens includes, in order from an object side to an image side: a glass screen E0, a first lens E1, a second lens E2, a stop STO, a third lens E3, a filter E4 and an image plane S9.

Glass screen E0 has an object side S01 and an image side S02. The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. Filter E4 has an object side S7 and an image side S8. The light from the object sequentially passes through the respective surfaces S01 to S8 and is finally imaged on the imaging surface S9.

Table 1 shows a basic parameter table of the optical imaging lens of embodiment 1, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 1

In this example, the total effective focal length f of the optical imaging lens is 0.39mm, the total length TTL of the optical imaging lens (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S9 of the optical imaging lens) is 2.62mm, the half ImgH of the diagonal length of the effective pixel region on the imaging surface S9 of the optical imaging lens is 0.92mm, and the maximum field angle FOV of the optical imaging lens is 127.7 °.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the third lens E3 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order term coefficients A that can be used for the aspherical mirror surfaces S1 to S6 in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.0639E-01

3.3110E+00

-1.4517E+01

3.0257E+01

-3.7197E+01

2.8168E+01

-1.2887E+01

3.2611E+00

-3.4934E-01

S2

4.0473E+00

-1.2053E+02

2.2551E+03

-2.1855E+04

1.2513E+05

-4.4012E+05

9.3326E+05

-1.0984E+06

5.5181E+05

S3

-1.1893E+00

9.7269E+00

-4.0899E+01

-1.0318E+03

1.4778E+04

-9.1681E+04

3.0550E+05

-5.2616E+05

3.6752E+05

S4

-2.6403E-01

2.9424E+01

-2.8791E+03

1.2434E+05

-2.9234E+06

4.0140E+07

-3.2037E+08

1.3741E+09

-2.4363E+09

S5

-5.7280E+00

6.2746E+02

-3.5345E+04

1.1602E+06

-2.3304E+07

2.9047E+08

-2.1927E+09

9.1812E+09

-1.6354E+10

S6

2.0851E+00

-9.5817E+01

3.2974E+03

-6.4781E+04

7.8140E+05

-5.8826E+06

2.7058E+07

-6.9915E+07

7.8105E+07

TABLE 2

Fig. 2A shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 1. Fig. 2B shows a distortion curve of the optical imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 2A and 2B, the optical imaging lens according to embodiment 1 can achieve good imaging quality.

Example 2

An optical imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3 to 4B. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical imaging lens according to embodiment 2 of the present application.

As shown in fig. 3, the optical imaging lens includes, in order from an object side to an image side: a glass screen E0, a first lens E1, a second lens E2, a stop STO, a third lens E3, a filter E4 and an image plane S9.

Glass screen E0 has an object side S01 and an image side S02. The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. Filter E4 has an object side S7 and an image side S8. The light from the object sequentially passes through the respective surfaces S01 to S8 and is finally imaged on the imaging surface S9.

In this example, the total effective focal length f of the optical imaging lens is 0.36mm, the total length TTL of the optical imaging lens is 2.63mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S9 of the optical imaging lens is 0.85mm, and the maximum field angle FOV of the optical imaging lens is 127.8 °.

Table 3 shows a basic parameter table of the optical imaging lens of embodiment 2, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 4 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 3

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

9.2203E-02

1.2834E-01

2.8772E-01

-1.0903E+00

1.2391E+00

-7.1347E-01

2.2629E-01

-3.7668E-02

2.5721E-03

S2

-3.0462E+00

7.9661E+01

-9.2194E+02

6.7131E+03

-3.0482E+04

8.6259E+04

-1.4881E+05

1.4339E+05

-5.9205E+04

S3

-2.5648E-01

1.4499E+01

-4.6212E+02

6.3906E+03

-5.7129E+04

3.1368E+05

-9.8718E+05

1.6255E+06

-1.0850E+06

S4

3.0390E+00

-4.8819E+02

2.8698E+04

-9.0772E+05

1.6804E+07

-1.8720E+08

1.2334E+09

-4.4185E+09

6.6210E+09

S5

0.0000E+00

S6

2.1744E+01

-1.2819E+03

4.1301E+04

-7.8355E+05

9.2221E+06

-6.8171E+07

3.0836E+08

-7.8128E+08

8.5079E+08

TABLE 4

Fig. 4A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 2. Fig. 4B shows a distortion curve of the optical imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 4A and 4B, the optical imaging lens according to embodiment 2 can achieve good imaging quality.

Example 3

An optical imaging lens according to embodiment 3 of the present application is described below with reference to fig. 5 to 6B. Fig. 5 shows a schematic structural diagram of an optical imaging lens according to embodiment 3 of the present application.

As shown in fig. 5, the optical imaging lens includes, in order from an object side to an image side: a glass screen E0, a first lens E1, a second lens E2, a stop STO, a third lens E3, a filter E4 and an image plane S9.

Glass screen E0 has an object side S01 and an image side S02. The first lens element E1 has negative power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. Filter E4 has an object side S7 and an image side S8. The light from the object sequentially passes through the respective surfaces S01 to S8 and is finally imaged on the imaging surface S9.

In this example, the total effective focal length f of the optical imaging lens is 0.33mm, the total length TTL of the optical imaging lens is 2.85mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S9 of the optical imaging lens is 1.00mm, and the maximum field angle FOV of the optical imaging lens is 125.8 °.

Table 5 shows a basic parameter table of the optical imaging lens of embodiment 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 6 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 5

TABLE 6

Fig. 6A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 6B shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 6A and 6B, the optical imaging lens according to embodiment 3 can achieve good imaging quality.

Example 4

An optical imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8B. Fig. 7 shows a schematic structural diagram of an optical imaging lens according to embodiment 4 of the present application.

As shown in fig. 7, the optical imaging lens includes, in order from an object side to an image side: a glass screen E0, a first lens E1, a second lens E2, a stop STO, a third lens E3, a filter E4 and an image plane S9.

In this example, the total effective focal length f of the optical imaging lens is 0.36mm, the total length TTL of the optical imaging lens is 2.82mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S9 of the optical imaging lens is 0.95mm, and the maximum field angle FOV of the optical imaging lens is 130.0 °.

Table 7 shows a basic parameter table of the optical imaging lens of embodiment 4, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-2.0879E-02

1.5927E+00

-4.9966E+00

9.5612E+00

-1.4043E+01

1.6865E+01

-1.6077E+01

1.1452E+01

-5.7453E+00

S2

-6.3109E+00

1.7988E+02

4.6161E+02

-1.0211E+05

2.2201E+06

-2.5716E+07

1.8998E+08

-9.5487E+08

3.3503E+09

S3

1.2322E+00

-5.0247E+01

4.3077E+02

2.7771E+03

-1.2192E+05

1.6247E+06

-1.3156E+07

7.2988E+07

-2.8729E+08

S4

2.9934E+01

-4.3923E+03

3.5968E+05

-1.8561E+07

6.3840E+08

-1.5098E+10

2.4823E+11

-2.8054E+12

2.0750E+13

S5

-3.1303E+01

1.0678E+04

-2.1782E+06

2.8068E+08

-2.4102E+10

1.4312E+12

-6.0179E+13

1.8146E+15

-3.9306E+16

S6

3.2456E+01

-3.9320E+03

2.7744E+05

-1.2479E+07

3.8154E+08

-8.2476E+09

1.2889E+11

-1.4702E+12

1.2218E+13

TABLE 8

Fig. 8A shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 4. Fig. 8B shows a distortion curve of the optical imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 8A and 8B, the optical imaging lens according to embodiment 4 can achieve good imaging quality.

In summary, examples 1 to 4 satisfy the relationships shown in table 9, respectively.

Conditions/examples	1	2	3	4
					f/EPD	1.63	1.58	1.55	1.58
(f1+f2)/f	1.46	1.83	0.87	1.69
					f3/(R5+R6)	0.65	0.40	0.94	0.21
ImgH/CT2	1.96	3.32	3.85	2.06
					TTL/CT3	7.23	7.61	7.49	9.58
DT11/(DT21+DT22)	1.49	1.90	1.92	1.54
					DT21/DT31	1.83	1.90	1.37	2.49
TTL/SL	2.09	2.10	2.18	2.12
					TTL/BFL	3.07	3.05	3.30	2.82
f23/f	1.74	1.75	2.20	1.81
					(SAG11+SAG12)/T12	1.74	1.50	1.42	1.50
ET1/CT1	2.27	2.06	2.40	2.20

TABLE 9

The application also provides a fingerprint identification device which comprises the optical imaging lens described above. And the image sensor in the fingerprint recognition device may be used to convert an optical signal incident to the image sensor via the optical imaging lens into an electrical signal.

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. The optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

a first lens having a negative refractive power, an object side surface of which is a concave surface;

a second lens having a positive refractive power, the object-side surface of which is convex; and

a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;

the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD is less than 1.65;

the combined focal length f23 of the second lens and the third lens and the total effective focal length f of the optical imaging lens satisfy that: f23/f is more than 1.6 and less than 2.4; and

at least one mirror surface of the object side surface of the first lens to the image side surface of the third lens is an aspherical mirror surface.

2. The optical imaging lens of claim 1, wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the total effective focal length f of the optical imaging lens satisfy: 0.7 < (f1+ f2)/f < 1.9.

3. The optical imaging lens of claim 1, wherein the half ImgH of the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens and the central thickness CT2 of the second lens on the optical axis satisfy: 1.8 < ImgH/CT2 < 4.0.

4. The optical imaging lens of claim 1, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens on the optical axis and a central thickness CT3 of the third lens element on the optical axis satisfy: TTL/CT3 is more than 7.0 and less than 10.0.

5. The optical imaging lens according to claim 1, wherein the effective half aperture DT11 of the object side surface of the first lens, the effective half aperture DT21 of the object side surface of the second lens, and the effective half aperture DT22 of the image side surface of the second lens satisfy: 1.4 < DT11/(DT21+ DT22) < 2.1.

6. The optical imaging lens of claim 1, wherein the effective half aperture DT31 of the object side surface of the third lens and the effective half aperture DT21 of the object side surface of the second lens satisfy: 1.3 < DT21/DT31 < 2.6.

7. The optical imaging lens according to claim 1, wherein abbe number V1 of the first lens satisfies: 50 < V1 < 70.

8. The optical imaging lens of claim 1, wherein the effective focal length f3 of the third lens, the radius of curvature R6 of the image side surface of the third lens, and the radius of curvature R5 of the object side surface of the third lens satisfy: 0.1 < f3/(R5+ R6) < 1.1.

9. The optical imaging lens according to claim 1, wherein a distance SAG11 on the optical axis from an intersection point of an object-side surface of the first lens and the optical axis to an effective radius vertex of an object-side surface of the first lens, a distance SAG12 on the optical axis from an intersection point of an image-side surface of the first lens and the optical axis to an effective radius vertex of an image-side surface of the first lens, and a distance T12 between the first lens and the second lens on the optical axis satisfy: 1.2 < (SAG11+ SAG12)/T12 < 1.9.

10. The optical imaging lens of claim 1, wherein the edge thickness ET1 of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy: 1.9 < ET1/CT1 < 2.5.

11. The optical imaging lens according to any one of claims 1 to 10, characterized in that the optical imaging lens further comprises a diaphragm,

the distance SL from the diaphragm to the imaging surface of the optical imaging lens on the optical axis and the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis satisfy the following conditions: TTL/SL is more than 2.0 and less than 2.5.

12. The optical imaging lens of any one of claims 1 to 10, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens on the optical axis and a distance BFL between an image side surface of the third lens element and the imaging surface of the optical imaging lens on the optical axis satisfy: TTL/BFL is more than 2.7 and less than 3.4.

13. The optical imaging lens according to any one of claims 1 to 10, wherein a maximum field angle FOV of the optical imaging lens satisfies: 120 < FOV < 140.

14. The optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens satisfy: 0.7 < (f1+ f2)/f < 1.9; and

15. The optical imaging lens of claim 14, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens on the optical axis and a central thickness CT3 of the third lens element on the optical axis satisfy: TTL/CT3 is more than 7.0 and less than 10.0.

16. The optical imaging lens of claim 14, wherein the half ImgH of the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens and the central thickness CT2 of the second lens on the optical axis satisfy: 1.8 < ImgH/CT2 < 4.0.

17. The optical imaging lens according to claim 14, wherein the effective half aperture DT11 of the object side surface of the first lens, the effective half aperture DT21 of the object side surface of the second lens, and the effective half aperture DT22 of the image side surface of the second lens satisfy: 1.4 < DT11/(DT21+ DT22) < 2.1.

18. The optical imaging lens of claim 14, wherein the effective half aperture DT31 of the object side surface of the third lens and the effective half aperture DT21 of the object side surface of the second lens satisfy: 1.3 < DT21/DT31 < 2.6.

19. The optical imaging lens according to claim 14, wherein abbe number V1 of the first lens satisfies: 50 < V1 < 70.

20. The optical imaging lens of claim 19, wherein the combined focal length f23 of the second and third lenses and the total effective focal length f of the optical imaging lens satisfy: f23/f is more than 1.6 and less than 2.4.

21. The optical imaging lens of claim 14, wherein a distance SAG11 on the optical axis from an intersection point of an object-side surface of the first lens and the optical axis to an effective radius vertex of an object-side surface of the first lens, a distance SAG12 on the optical axis from an intersection point of an image-side surface of the first lens and the optical axis to an effective radius vertex of an image-side surface of the first lens, and a distance T12 between the first lens and the second lens on the optical axis satisfy: 1.2 < (SAG11+ SAG12)/T12 < 1.9.

22. The optical imaging lens of claim 14, wherein the edge thickness ET1 of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy: 1.9 < ET1/CT1 < 2.5.

23. The optical imaging lens of any one of claims 14 to 22, characterized in that the optical imaging lens further comprises a diaphragm,

24. An optical imaging lens barrel according to any one of claims 14 to 22, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens on the optical axis and a distance BFL between an image side surface of the third lens element and the imaging surface of the optical imaging lens on the optical axis satisfy: TTL/BFL is more than 2.7 and less than 3.4.

25. The optical imaging lens as claimed in any one of claims 14 to 22, wherein the maximum field angle FOV of the optical imaging lens satisfies: 120 < FOV < 140.

26. The optical imaging lens of claim 25, wherein the effective focal length f3 of the third lens, the radius of curvature R6 of the image side surface of the third lens, and the radius of curvature R5 of the object side surface of the third lens satisfy: 0.1 < f3/(R5+ R6) < 1.1.

27. A fingerprint recognition apparatus, comprising:

the optical imaging lens according to any one of claims 1 to 26, wherein the optical imaging lens further comprises a glass screen on the object side; and

an image sensor for converting an optical signal incident to the image sensor via the optical imaging lens into an electrical signal.