CN112305837A

CN112305837A - Optical imaging lens and electronic device

Info

Publication number: CN112305837A
Application number: CN202011197501.5A
Authority: CN
Inventors: 马明; 张璐嫚
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-02-02

Abstract

The application discloses optical imaging lens and electronic equipment belongs to optical imaging technical field. The optical imaging lens comprises a shell, a first lens, a lens group and a photosensitive element, wherein the shell is provided with a light hole and an inner cavity, the light hole is communicated with the inner cavity, the first lens is arranged in the light hole, and the lens group and the photosensitive element are both arranged in the inner cavity; the lens group is positioned between the first lens and the photosensitive element, and the ambient light can be projected to the photosensitive element through the first lens and the lens group in sequence; the lens group comprises at least two lenses which are sequentially arranged on an optical axis of the optical imaging lens, and the optical imaging lens further comprises a driving mechanism which is in driving connection with at least part of the lenses of the lens group and drives the lenses to move on the optical axis relative to the photosensitive element. The problem that the existing optical imaging lens is difficult to give consideration to both shooting quality and structural lightness and thinness can be solved by the scheme.

Description

Optical imaging lens and electronic device

Technical Field

The application belongs to the technical field of optical imaging, and particularly relates to an optical imaging lens and an electronic device.

Background

With the development of technology, the performance of electronic devices (such as mobile phones, tablet computers, etc.) has been greatly developed, wherein the photographing and photographing functions of the electronic devices are becoming more powerful. An optical imaging lens of an electronic device generally includes a lens group and a photosensitive element, on which external light may pass through the lens group and be processed, and the photosensitive element converts an optical signal into an electrical signal to form an image.

At present, the design of the electronic device is more popular with users due to the slimness, and the installation space provided for the optical imaging lens inside the electronic device becomes narrow due to the slimness of the electronic device, and it is difficult to provide more lenses in the optical imaging lens, so that it is difficult to achieve the shooting functions or effects of multi-object-distance shooting (such as macro and telephoto shooting), low optical distortion, and the like.

Disclosure of Invention

The embodiment of the application aims to provide an electronic device, which can solve the problem that the existing optical imaging lens is difficult to consider both shooting quality and structural lightness and thinness.

In order to solve the technical problem, the present application is implemented as follows:

in a first aspect, an embodiment of the present application provides an optical imaging lens, including a housing, a first lens, a lens group, and a photosensitive element, where the housing has a light hole and an inner cavity, the light hole is communicated with the inner cavity, the first lens is disposed in the light hole, and both the lens group and the photosensitive element are disposed in the inner cavity;

the lens group is positioned between the first lens and the photosensitive element, and ambient light can be projected to the photosensitive element through the first lens and the lens group in sequence;

the lens group comprises at least two lenses which are sequentially arranged on an optical axis of the optical imaging lens, and the optical imaging lens further comprises a driving mechanism which is in driving connection with at least part of the lenses of the lens group and drives the lenses to move on the optical axis relative to the photosensitive element.

In a second aspect, an embodiment of the present application provides an electronic device, which includes the foregoing optical imaging lens.

In the optical imaging lens disclosed in the embodiment of the application, the first lens is arranged on the light hole, the first lens has a sealing protection effect on the inner cavity and has an adjusting effect on external light rays, and compared with the prior art, under the condition that the number of the lenses is the same, the number of the lenses arranged in the shell is less, so that better lightness and thinness can be obtained undoubtedly; meanwhile, the optical imaging lens disclosed by the embodiment of the application adopts a plurality of lenses, and the optical imaging lens has at least one beneficial effect of being light and thin, ultra-wide, good in imaging effect and the like by reasonably distributing the focal power, the surface type, the center thickness, the on-axis distance between the lenses and the like of each lens.

Drawings

Fig. 1 is a schematic structural diagram of a first optical imaging lens disclosed in an embodiment of the present application;

fig. 2 to 5 are schematic diagrams of an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of a first optical imaging lens disclosed in an embodiment of the present application, respectively;

fig. 6 is a schematic structural diagram of a second optical imaging lens disclosed in the embodiment of the present application;

fig. 7 to 10 are schematic diagrams of an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of a second optical imaging lens disclosed in an embodiment of the present application, respectively;

fig. 11 is a schematic structural diagram of a third optical imaging lens disclosed in the embodiment of the present application;

fig. 12 to 15 are schematic diagrams of an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve of a third optical imaging lens disclosed in the embodiment of the present application, respectively;

description of reference numerals:

e1-first lens, E2-second lens, E3-third lens, E4-fourth lens, E5-fifth lens, E6-sixth lens, E7-seventh lens, E8-eighth lens, E9-filter, S19-imaging plane.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

In the drawings, the thickness, size, and shape of the lens have been 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.

The technical solutions disclosed in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 15, an optical imaging lens includes a housing, a first lens E1, a lens assembly, and a photosensitive element.

The shell is a basic component of the optical imaging lens, provides a mounting and supporting base for other components, and plays a certain role in protection. In this embodiment, the first lens E1, the lens group and the photosensitive element are all disposed in the housing, specifically, the housing has a light hole and an inner cavity, the light hole communicates with the inner cavity, the first lens E1 is disposed in the light hole, and the lens group and the photosensitive element are all disposed in the inner cavity. It should be understood that the light-transmitting hole is used for allowing external ambient light to enter the inner cavity, so as to provide conditions for photosensitive imaging of the subsequent photosensitive element.

The first lens E1 and the lens group are optical components of the optical imaging lens, and the first lens E1 of the present embodiment is disposed in the light hole, so that when ambient light passes through the light hole, the ambient light is dimmed by the first lens E1 and then enters the inner cavity. The lens group of the embodiment is located between the first lens E1 and the photosensitive element, and the ambient light can be projected to the photosensitive element through the first lens E1 and the lens group in sequence, that is, the ambient light is incident into the inner cavity through the dimming processing of the first lens E1, and is projected to the lens group, and is projected to the photosensitive element through the dimming processing of the lens group again.

The photosensitive element is an imaging component of the optical imaging lens, and can convert ambient light entering the inner cavity into pictures, namely form images after being photosensitive. In order to facilitate imaging of ambient light on the photosensitive element, the first lens E1 and the lenses in the lens group are generally arranged in sequence on the optical axis of the optical imaging lens.

In traditional optical imaging lens, it is only provided with the lens group in the inner chamber, and is provided with the glass apron on the light trap, and the glass apron plays sealed guard action to the inner chamber in light trap department, and the permeable glass apron of ambient light and inject into the inner chamber, and undoubtedly, traditional optical imaging lens only can adjust luminance through lens group to ambient light and handle.

In the optical imaging lens in this embodiment, it replaces the glass apron through setting up first lens E1 on the light trap, first lens E1 plays sealed guard action to the inner chamber promptly at the light trap department, and can carry out the processing of adjusting luminance with the battery of lens in the inner chamber jointly to ambient light, when optical imaging lens set up the same number of lens, the battery of lens of this embodiment can set up less quantity, it occupies the installation space of inner chamber also littleer, so can design optical imaging lens's overall dimension littleer, and then realize the frivolousness of its structure.

As can be seen from the above description, in the optical imaging lens disclosed in the embodiment of the present application, the first lens E1 is disposed on the light-transmitting hole, and the first lens E1 has a sealing and protecting effect on the inner cavity and an adjusting effect on external light rays, compared to the prior art, under the condition that the number of lenses is the same, the number of lenses disposed in the housing is smaller, and better lightness and thinness can be obtained undoubtedly; meanwhile, the optical imaging lens disclosed by the embodiment of the application adopts a plurality of lenses, and the optical imaging lens has at least one beneficial effect of being light and thin, ultra-wide, good in imaging effect and the like by reasonably distributing the focal power, the surface type, the center thickness, the on-axis distance between the lenses and the like of each lens.

In the present embodiment, the number of lenses of the lens group is not limited, and if the lens group includes four, five, or six lenses, the optical imaging lens includes five, six, or seven lenses with the addition of the first lens E1. Generally, in an optical imaging lens, the larger the number of lenses included in the optical imaging lens, the stronger the dimming capability of the optical imaging lens on ambient light, and thus the better the imaging quality of the optical imaging lens.

In order to enable the lenses of the lens group to perform dimming processing on ambient light well, the plurality of lenses are generally arranged in sequence on the optical axis of the optical imaging lens, so that the ambient light entering the inner cavity through the first lens E1 can be dimmed by the light of the lens group in sequence.

Meanwhile, in order to improve the focusing capability of the optical imaging lens, the optical imaging lens of the embodiment may further include a driving mechanism, where the driving mechanism is drivingly connected to at least a part of the lenses of the lens group and drives the lenses to move on the optical axis relative to the photosensitive element. It is to be understood that at least part of the lenses are movable, i.e. in a lens group, at least one lens being movable by a drive mechanism. The part of the lens can have a continuous stroke and can stay at any position in the stroke, and also can stay at a plurality of preset positions. For example, at least some of the lenses movably disposed can stay at three different positions, so that the optical imaging lens has a state where the object distance is infinity, a state where the object distance is 350mm, and a state where the object distance is 100 mm; or, there are several movable lenses, and these several movable lenses are mutually fixedly connected and can be synchronously moved; alternatively, there may be a plurality of movable lenses, but each lens moves independently of the other.

Through the movement of the lens, the optical imaging lens of the embodiment can realize the automatic focusing function, and simultaneously, the focal power surface types of the lenses are matched, so that the whole structure is more compact. The embodiment is not limited to a specific type of driving mechanism, and the driving mechanism may be a linear motor, a rack and pinion assembly, a lead screw assembly, a hydraulic telescopic assembly, a pneumatic telescopic assembly, or the like.

In this embodiment, the lens group may include seven lenses, specifically, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8, and the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8 are arranged in order from the object side to the image side along the optical axis of the optical imaging lens. With such a configuration, the focal power, the surface shape, the center thickness, the on-axis distance between the lenses, and the like of each lens are reasonably allocated to the first lens E1 and the seven lenses of the lens group, so that the optical imaging lens has at least one of the advantages of being light and thin, having an ultra-wide angle, having a good imaging effect, and the like.

Of course, the present embodiment does not limit the type of the focal power of each of the first lens element E1 to the eighth lens element E8, and each of the first lens element E1 to the eighth lens element E8 may have a positive focal power or a negative focal power.

The focal power of the lens is related to the relation of the curvature radiuses of the object side surface and the image side surface of the lens, and the focal power of the lens can be effectively controlled by controlling and setting the ratio of the curvature radiuses of the object side surface and the image side surface of each lens. In an alternative, the object-side surface of the first lens E1 may be concave and the image-side surface may be convex, and a radius of curvature R1 of the object-side surface of the first lens E1 and a radius of curvature R2 of the image-side surface of the first lens E1 may satisfy-10 < R1/R2 < 5, more specifically, R1 and R2 may further satisfy-9.0. ltoreq. R11/R12. ltoreq.1.0, and further, R1 and R1 may satisfy-8.86. ltoreq. R11/R12. ltoreq.0.93. The curvature radius of the object side surface and the curvature radius of the image side surface of the first lens E1 are reasonably controlled, so that the chief ray angle of the optical imaging system is controlled in a reasonable range.

In order to make the optical imaging lens obtain a larger angle of view, both the first lens element E1 and the eighth lens element E8 of the present embodiment may have negative refractive power. Specifically, since the negative-power lens can diffuse the light after processing the light, the ambient light emitted through the first lens E1 is diffused, so that the ambient light with a larger viewing angle range outside the housing can enter the inner cavity, and the optical imaging lens has an ultra-wide angle performance; the ambient light is also diverged after being processed by the eighth lens E8, so that the ambient light with a larger viewing angle range can be received by the photosensitive element to realize imaging with a wide viewing angle.

In the present embodiment, the surface type of each lens is not limited, and for example, the surface of each lens may be a spherical surface, or a part of the lenses may be an aspherical surface. In another specific embodiment, the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8 may each be an aspheric lens. It should be noted that, the aspheric lens is characterized in that the curvature is continuously changed 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. With such a configuration, after the aspheric lens is adopted, the optical imaging lens of the embodiment can eliminate aberration occurring during imaging as much as possible, thereby improving imaging quality.

In an optional scheme, the maximum field angle FOV of the optical imaging lens of the present embodiment may satisfy: 75 < FOV < 85. By controlling the full field angle FOV of the lens, the imaging range of the system can be effectively controlled. More specifically, the FOV may further satisfy 78 DEG & ltoreq 82 DEG FOV.

In an optional scheme, one half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 of the optical imaging lens of the present embodiment may satisfy: ImgH > 7.2 mm. Under such setting, can make this optical imaging lens have the characteristics of high pixel, can effectively improve system's resolving power. More specifically, ImgH may further satisfy ImgH > 7.5 mm.

In an alternative scheme, a separation distance TTL between the object side surface of the first lens element E1 and the imaging surface S19 of the optical imaging lens on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface S19 of the optical imaging lens may satisfy: TTL/ImgH is less than 1.35. Under such a configuration, the optical total length of the lens can be effectively reduced while the optical imaging lens is ensured to have a larger imaging area, thereby realizing the ultra-thin characteristic and miniaturization of the lens. More specifically, TTL and ImgH can further satisfy 1.21 ≦ TTL/ImgH ≦ 1.31.

In an optional scheme, the effective focal length f2 of the second lens E2 of the present embodiment and the total effective focal length f of the optical imaging lens may satisfy: f2/f is more than 0.7 and less than 1.0. With this arrangement, the amount of spherical aberration contribution of the second lens element E2 can be effectively controlled, and the aberration of the optical imaging lens can be reduced. More specifically, f2 and f can further satisfy 0.8 < f2/f < 0.92.

In an optional scheme, half of the diagonal length ImgH of the effective pixel area on the imaging surface S19 of the optical imaging lens of the present embodiment, the entrance pupil diameter EPD of the optical imaging lens, and the total effective focal length f of the optical imaging lens may satisfy: 2.5mm < ImgH × EPD/f < 3.5 mm. Under such setting, through making this optical imaging lens's total effective focal length, entrance pupil diameter and image height match, can make optical imaging lens have big aperture characteristic and big image plane characteristic, and then make this optical imaging lens have the high resolution and can realize better purpose of background blurring. More specifically, ImgH, EPD and f may further satisfy 2.6mm < ImgH × EPD/f < 3.2 mm.

In an optional scheme, the total effective focal length f of the optical imaging lens of the embodiment may satisfy: f is more than 6.5 and less than 8.0 mm. The total effective focal length of the optical imaging lens is set in the range, so that the total effective focal length of the optical imaging lens can be better matched with other parameters of the optical imaging lens, and the overall performance of the optical imaging lens is improved. More specifically, f may further satisfy 6.8 < f < 7.6 mm.

In an alternative scheme, the distance T56 between the central thickness CT5 of the fifth lens E5 of the present embodiment on the optical axis and the optical axes of the fifth lens E5 and the sixth lens E6 may satisfy: 0.6 < CT5/T56 < 0.7. Under the arrangement, the field curvature contribution of each field of view of the optical imaging lens can be controlled within a reasonable range so as to balance the field curvature contribution generated by other lenses. More specifically, CT5 and T56 may further satisfy 0.61 < CT5/T56 < 0.68.

In an optional scheme, the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens of this embodiment may satisfy: f/EPD < 1.95. With the arrangement, the large aperture characteristic and the large image surface characteristic of the optical imaging lens can be better ensured. More specifically, f and EPD may further satisfy 1.1 < f/EPD < 1.7.

In an optional scheme, the focusing stroke L of the optical imaging lens of the present embodiment and the total effective focal length f of the optical imaging lens may satisfy: l is more than 0.13mm and less than 0.2mm, and L/f is more than 0.01 and less than 0.03. Under such setting, can ensure that this optical imaging lens realizes focusing fast, and then promote user's use experience.

In an optional scheme, a filter E9 may be disposed between the lens assembly and the photosensitive element, and the filter E9 can selectively absorb different wave bands of ambient light, so as to adapt to different styles of light and shadow effects during imaging. In general, the infrared light can be absorbed by the filter E9 to avoid the infrared light affecting the imaging effect.

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

Referring to fig. 1 to 3, the present embodiment discloses a first optical imaging lens.

As shown in fig. 1, the optical imaging lens includes, in order from an object side to an imaging side along an optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.

The first lens element E1 has negative power, and has a convex 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 negative power, and has a convex object-side surface S5 and a concave image-side surface S6; the fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8; the fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10; the sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12; the seventh lens element E7 has positive power, and has a concave object-side surface S13 and a convex image-side surface S14; the eighth lens element E8 has negative power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. The ambient light sequentially passes through the surfaces S1-S18 and is finally imaged on the imaging surface S19.

	TTL	EFL	EPND	IMH	D_obj	D2	D16
								Infinity	9.1075	7.8889	3.6	7.1	Infinity	0.2638	0.9353
Mod	9.1075	7.8921	3.6	7.2	385	0.11	1.0891

TABLE 1

TABLE 2

Table 1 and table 2 show the overall parameters of such an optical imaging lens and the surface type, radius of curvature, thickness, material, and conic coefficient of each lens, where the unit of the radius of curvature and the thickness are both millimeters (mm).

Each aspheric surface can be defined using 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 the conic coefficient (given in table 1); ai is the correction coefficient of the i-th order of the aspherical surface. Table 3 below gives the high-order coefficient coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 for each aspheric surface;

TABLE 3

As can be seen from tables 1 to 3, the first optical imaging lens satisfies the parameter ranges of the aforementioned alternatives.

Fig. 2 shows in sequence:

the first optical imaging lens has an axial chromatic aberration diagram, which shows the deviation of the convergent focus of the light rays with different wavelengths after passing through the lens;

the astigmatism curve diagram of the first optical imaging lens represents meridional field curvature and sagittal field curvature;

the distortion curve diagram of the first optical imaging lens represents distortion magnitude values corresponding to different angles of view;

fig. 3 is a schematic diagram showing a chromatic aberration of magnification curve of the first optical imaging lens, which represents the deviation of different image heights of light rays on an imaging surface after passing through the lens.

As can be seen from fig. 2 and 3, the first optical imaging lens can achieve good imaging quality with low dispersion.

Referring to fig. 4 to 6, the present embodiment discloses a second optical imaging lens.

As shown in fig. 4, the optical imaging lens includes, in order from an object side to an imaging side along an optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.

	TTL	EFL	EPND	IMH	D_obj	D2	D16
								Infinity	8.28	7.6881	3.6	5.8	Infinity	0.2610	0.8291
Mod	8.28	7.6935	3.6	5.9	350	0.1242	0.9659

TABLE 4

TABLE 5

Table 4 and table 5 show the overall parameters of such an optical imaging lens and the surface type, radius of curvature, thickness, material, and conic coefficient of each lens, where the unit of the radius of curvature and the thickness are both millimeters (mm).

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 the conic coefficient (given in table 1); ai is the correction coefficient of the i-th order of the aspherical surface. Table 6 below gives the high-order coefficient coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 for each aspheric surface;

TABLE 6

As can be seen from tables 4 to 6, the second optical imaging lens satisfies the parameter ranges of the aforementioned alternatives.

Fig. 5 shows in sequence:

the second optical imaging lens has a schematic diagram of axial chromatic aberration curves, which shows the deviation of the convergent focus of light rays with different wavelengths after passing through the lens;

the astigmatism curve diagram of the second optical imaging lens represents meridional field curvature and sagittal field curvature;

the second optical imaging lens has a distortion curve diagram, which represents the distortion magnitude values corresponding to different angles of view;

fig. 6 is a schematic diagram showing a chromatic aberration of magnification curve of a second optical imaging lens, which shows the deviation of different image heights of light rays on an imaging surface after passing through the lens.

As can be seen from fig. 5 and 6, the second optical imaging lens can achieve good imaging quality with low dispersion.

Referring to fig. 7 to 9, the present embodiment discloses a third optical imaging lens.

As shown in fig. 7, the optical imaging lens includes, in order from an object side to an imaging side along an optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.

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 concave image-side surface S4; the third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6; the fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8; the fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10; the sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12; the seventh lens element E7 has positive power, and has a concave object-side surface S13 and a convex image-side surface S14; the eighth lens element E8 has negative power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. The ambient light sequentially passes through the surfaces S1-S18 and is finally imaged on the imaging surface S19.

	TTL	EFL	EPND	IMH	D_obj	D2	D16
								Infinity	8.28	6.9719	3.6	5.7	Infinity	0.2321	0.8580
Mod	8.28	6.9722	3.6	5.78	350	0.10	0.9901

TABLE 7

TABLE 8

Table 7 and table 8 show the overall parameters of this type of optical imaging lens, and the surface type, radius of curvature, thickness, material, and conic coefficient of each lens, where the unit of the radius of curvature and thickness are both millimeters (mm).

flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-5.20E-05

3.12E-05

-8.1E-06

5.55E-07

-3.77E-08

9.82E-09

-1.41E-09

1.13E-10

-3.87E-12

S2

-1.09E-04

5.32E-05

-1.26E-05

7.96E-07

1.79E-08

-5.72E-09

1.04E-09

-1.06E-10

4.51E-12

S3

-5.54E-04

2.69E-03

-4.98E-03

5.70E-03

-4.03E-03

1.79E-03

-4.89E-04

7.53E-05

-5.07E-06

S4

-7.20E-03

9.93E-04

4.11E-03

-6.84E-03

5.88E-03

-3.02E-03

9.06E-04

-1.47E-04

9.78E-06

S5

-1.29E-02

1.84E-04

9.31E-03

-1.15E-02

8.74E-03

-4.24E-03

1.27E-03

-2.08E-04

1.43E-05

S6

-3.66E-03

4.83E-03

-3.25E-03

6.28E-03

-7.00E-03

4.52E-03

-1.69E-03

3.45E-04

-2.92E-05

S7

-1.08E-02

-1.95E-03

-4.90E-03

4.69E-03

-3.49E-03

1.85E-03

-7.08E-04

1.74E-04

-1.84E-05

S8

-8.28E-03

-1.72E-02

1.96E-02

-1.68E-02

8.76E-03

-2.72E-03

4.29E-04

-1.03E-05

-3.84E-06

S9

-2.53E-02

-3.82E-02

5.30E-02

-4.80E-02

2.86E-02

-1.10E-02

2.56E-03

-3.21E-04

1.59E-05

S10

-8.05E-03

-5.05E-02

5.96E-02

-4.59E-02

2.31E-02

-7.56E-03

1.56E-03

-1.84E-04

9.46E-06

S11

2.05E-02

-5.78E-02

5.86E-02

-3.73E-02

1.50E-02

-3.74E-03

5.53E-04

-4.49E-05

1.54E-06

S12

2.65E-03

-4.40E-02

3.82E-02

-1.86E-02

5.85E-03

-1.16E-03

1.38E-04

-9.02E-06

2.46E-07

S13

3.76E-02

-4.96E-02

2.40E-02

-8.55E-03

2.31E-03

-4.56E-04

5.92E-05

-4.42E-06

1.40E-07

S14

6.55E-02

-4.49E-02

1.46E-02

-3.12E-03

4.53E-04

-4.50E-05

2.98E-06

-1.20E-07

2.23E-09

S15

-6.66E-02

1.02E-02

-1.27E-03

2.24E-04

-3.07E-05

2.54E-06

-1.22E-07

3.19E-09

-3.52E-11

S16

-5.11E-02

1.18E-02

-1.98E-03

2.51E-04

-2.35E-05

1.52E-06

-6.32E-08

1.51E-09

-1.57E-11

TABLE 9

As can be seen from tables 7 to 9, the third type of optical imaging lens satisfies the parameter ranges of the aforementioned alternatives.

Fig. 8 shows in sequence:

the schematic diagram of the axial chromatic aberration curve of the third optical imaging lens represents the deviation of the convergent focus of the light rays with different wavelengths after passing through the lens;

an astigmatism curve diagram of the third optical imaging lens represents meridional image plane curvature and sagittal image plane curvature;

a distortion curve diagram of the third optical imaging lens, which represents distortion magnitude values corresponding to different angles of view;

fig. 9 shows a schematic diagram of a chromatic aberration of magnification curve of a third optical imaging lens, which represents the deviation of different image heights of light rays on an imaging surface after passing through the lens.

As can be seen from fig. 8 and 9, the third optical imaging lens can achieve good imaging quality with low dispersion.

Based on the optical imaging lens, the embodiment further discloses an electronic device including the optical imaging lens. The electronic device referred to in this embodiment may be a smart phone, a tablet computer, an electronic book reader, a wearable device, and the like, and the specific type of the electronic device is not limited in this embodiment.

In general, the housing of the optical imaging lens and the housing of the electronic device are separate members. Of course, the housing of the optical imaging lens may also be a housing of the electronic device, and at this time, the light-transmitting hole is formed in the housing; meanwhile, the optical imaging lens does not need to be provided with a shell in the arrangement mode, and the space utilization rate inside the electronic equipment can be improved.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An optical imaging lens is characterized by comprising a shell, a first lens, a lens group and a photosensitive element, wherein the shell is provided with a light hole and an inner cavity, the light hole is communicated with the inner cavity, the first lens is arranged in the light hole, and the lens group and the photosensitive element are both arranged in the inner cavity;

the lens group is positioned between the first lens and the photosensitive element, and ambient light can be projected to the photosensitive element through the first lens and the lens group in sequence; the lens group comprises at least two lenses which are sequentially arranged on an optical axis of the optical imaging lens, and the optical imaging lens further comprises a driving mechanism which is in driving connection with at least part of the lenses of the lens group and drives the lenses to move on the optical axis relative to the photosensitive element.

2. The optical imaging lens according to claim 1, wherein the lens group includes a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are arranged in order from an object side to an image side along an optical axis of the optical imaging lens.

3. The optical imaging lens of claim 2, wherein the first lens and the eighth lens each have a negative optical power.

4. The optical imaging lens according to claim 2, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are each an aspherical lens.

5. The optical imaging lens of claim 2, wherein the maximum field angle FOV of the optical imaging lens satisfies:

75°＜FOV＜85°。

6. the optical imaging lens according to claim 2, wherein ImgH, which is half the diagonal length of an effective pixel area on an imaging plane of the optical imaging lens, satisfies:

ImgH＞7.2mm。

7. the optical imaging lens of claim 2, wherein a separation 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 half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens satisfy:

TTL/ImgH＜1.35。

8. the optical imaging lens of claim 2, wherein the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens satisfy:

0.7＜f2/f＜1.0。

9. the optical imaging lens of claim 2, wherein the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens, the entrance pupil diameter EPD of the optical imaging lens, and the total effective focal length f of the optical imaging lens satisfy:

2.5mm＜ImgH×EPD/f＜3.5mm。

10. the optical imaging lens of claim 2, wherein the total effective focal length f of the optical imaging lens satisfies:

6.5＜f＜8.0mm。

11. the optical imaging lens of claim 2, wherein a center thickness CT5 of the fifth lens on the optical axis and a separation distance T56 of the fifth lens and the sixth lens on the optical axis satisfy:

0.6＜CT5/T56＜0.7。

12. the optical imaging lens of claim 2, wherein 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＜1.95。

13. the optical imaging lens of claim 2, wherein the focusing stroke L of the optical imaging lens and the total effective focal length f of the optical imaging lens satisfy:

l is more than 0.13mm and less than 0.2mm, and L/f is more than 0.01 and less than 0.03.

14. An electronic device characterized by comprising the optical imaging lens according to any one of claims 1 to 13.