CN111308666A

CN111308666A - Optical imaging lens, imaging module and electronic device

Info

Publication number: CN111308666A
Application number: CN202010254739.0A
Authority: CN
Inventors: 邹海荣
Original assignee: OFilm Tech Co Ltd
Current assignee: Nanchang OFilm Precision Optical Products Co Ltd; OFilm Group Co Ltd
Priority date: 2020-04-02
Filing date: 2020-04-02
Publication date: 2020-06-19

Abstract

The application relates to an optical imaging lens, an imaging module and an electronic device. The optical imaging lens sequentially comprises diaphragms from an object side to an image side along an optical axis; the first lens element with positive refractive power has a convex object-side surface at a paraxial region; a second lens element with refractive power; a third lens element with refractive power having a concave object-side surface at a paraxial region; a fourth lens element with refractive power; a fifth lens element with positive refractive power having a convex image-side surface at a paraxial region; a sixth lens element with refractive power; and a seventh lens element with negative refractive power having a concave image-side surface at the paraxial region. When the optical imaging lens meets the specific relation, the optical imaging lens has the characteristics of wide visual angle, high image resolution and miniaturization.

Description

Optical imaging lens, imaging module and electronic device

Technical Field

The present invention relates to the field of optical imaging technologies, and in particular, to an optical imaging lens, an imaging module, and an electronic device.

Background

In recent years, with the development of imaging technology, people have higher and higher requirements on the shooting angle and the imaging quality of lenses, and meanwhile, the structural characteristics of lightness, thinness and miniaturization gradually become the development trend of the lenses.

The traditional optical imaging lens usually adopts more than six lenses to obtain higher resolving power, but the increase of the number of the lenses affects the miniaturization of the lens, conflicts with the light and thin design concept of portable electronic equipment of a mobile phone, and simultaneously increases the production cost of the lens; although the total length of the lens can be directly shortened by reducing the number of the lenses, the shooting angle and the image capturing capability of the lens cannot be ensured.

Disclosure of Invention

In view of the above, there is a need for an improved optical imaging lens, which is more difficult to achieve wide viewing angle, miniaturization, and high resolution.

An optical imaging lens comprises a diaphragm along an optical axis from an object side to an image side in sequence; the optical lens comprises a first lens element with positive refractive power, and a second lens element with positive refractive power, wherein the object-side surface of the first lens element is convex at the paraxial region; a second lens element with refractive power; a third lens element with refractive power; a fourth lens element with refractive power; the fifth lens element with positive refractive power has a convex image-side surface at a paraxial region; a sixth lens element with refractive power; the image side surface of the seventh lens element is concave at the paraxial region;

the optical imaging lens satisfies the following relational expression:

(SAG51+SAG52)/(SAG61+SAG62)≤1；

SAG51 represents a distance in the optical axis direction from the intersection point of the object side surface of the fifth lens and the optical axis to the maximum effective aperture of the object side surface of the fifth lens, SAG52 represents a distance in the optical axis direction from the intersection point of the image side surface of the fifth lens and the optical axis to the maximum effective aperture of the image side surface of the fifth lens, SAG61 represents a distance in the optical axis direction from the intersection point of the object side surface of the sixth lens and the optical axis to the maximum effective aperture of the object side surface of the sixth lens, and SAG62 represents a distance in the optical axis direction from the intersection point of the image side surface of the sixth lens and the optical axis to the maximum effective aperture of the image side surface of the sixth lens.

According to the optical imaging lens, the refractive power and the surface shape of each lens and the effective focal length of each lens are reasonably distributed by selecting a proper number of lenses, so that the imaging analysis capability of the lens can be enhanced and the aberration can be effectively corrected while the wide visual angle and the miniaturization of the optical imaging lens are ensured, and the scene details can be captured more accurately; meanwhile, the object side rise and the image side rise of the fifth lens and the object side rise and the image side rise of the sixth lens are controlled to meet the relationship, so that the wide visual angle of the lens is guaranteed, the distortion is effectively controlled, the processing sensitivity of the lens is reduced, and the production yield is improved.

In one embodiment, the optical imaging lens satisfies the following relation:

sigma ETA/TTL is less than or equal to 0.5; Σ ETA represents the sum of distances in the optical axis direction from the maximum effective aperture of the image side surface of the preceding lens to the maximum effective aperture of the object side surface of the subsequent lens in each of the adjacent lenses of the first lens to the seventh lens, and TTL represents the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens.

When the relation is satisfied, the air interval between the maximum effective calibers of the adjacent lenses in the optical imaging lens and the total lens length can be reasonably configured, so that the arrangement structure of the optical imaging lens is more compact, and the miniaturization of the lens is realized.

In one embodiment, the optical imaging lens satisfies the following relation:

3mm/deg is less than or equal to 100 ∑ CT/FOV is less than or equal to 5 mm/deg; wherein Σ CT represents the sum of thicknesses of the respective lenses of the first lens to the seventh lens on the optical axis, and FOV represents the field angle in the diagonal direction of the optical imaging lens.

When the above relation is satisfied, the thicknesses of the lenses on the optical axis and the field angles of the lenses in the diagonal direction in the optical imaging lens can be reasonably configured, so that the thicknesses of the lenses are effectively compressed while the wide viewing angle of the lens is ensured, and the miniaturization of the lens is realized.

In one embodiment, the optical imaging lens satisfies the following relation:

Y61-Y52 is more than or equal to 0 and less than or equal to 0.5 mm; wherein Y52 represents the maximum effective aperture of the image-side surface of the fifth lens, and Y61 represents the maximum effective aperture of the object-side surface of the sixth lens.

When the relation is met, the wide-angle and miniaturization of the optical imaging lens are favorably realized, and the arrangement of each lens in the lens is also favorably more compact, so that related components such as a spacer and the like can be avoided, the production cost of the lens is favorably reduced, the production overtime is shortened, and the production profit and the product delivery rate are ensured; in addition, the compact arrangement structure is also favorable for shortening the air interval from the maximum effective caliber position of the fifth lens to the maximum effective caliber position of the sixth lens, and the use of a spacer is avoided, so that the generation of stray light is greatly reduced, the generation probability of ghost images is reduced, and the imaging quality of the lens is improved.

In one embodiment, the optical imaging lens satisfies the following relation:

1 is more than or equal to (CT6+ CT7)/CT5 is less than or equal to 2; wherein CT5 denotes a thickness of the fifth lens on an optical axis, CT6 denotes a thickness of the sixth lens on an optical axis, and CT7 denotes a thickness of the seventh lens on an optical axis.

When the above relationship is satisfied, the thicknesses of the fifth, sixth, and seventh lenses on the optical axis can be appropriately arranged, so that the angle of view can be enlarged while aberration is effectively suppressed, and the imaging quality can be improved.

In one embodiment, the optical imaging lens satisfies the following relation:

(ET2+ ET3)/(CT2+ CT3) is less than or equal to 1.5; wherein ET2 represents a distance in an optical axis direction from a maximum effective aperture of an object-side surface of the second lens to a maximum effective aperture of an image-side surface thereof, ET3 represents a distance in the optical axis direction from a maximum effective aperture of an object-side surface of the third lens to a maximum effective aperture of an image-side surface thereof, CT2 represents a thickness of the second lens in the optical axis, and CT3 represents a thickness of the third lens in the optical axis.

When the relation is met, the wide-angle of the lens is facilitated, light can be stably transited, stray light among lenses is reduced, and the generation probability of ghost images is reduced; in addition, the central thickness and the thickness of the maximum effective caliber position of the second lens and the central thickness and the thickness of the maximum effective caliber position of the third lens are reasonably configured, so that the sensitivity of the lenses can be effectively reduced, the lenses are convenient to form and assemble, the production yield is improved, and the quality control cost is reduced.

In one embodiment, the optical imaging lens satisfies the following relation:

TTL/f is more than or equal to 1 and less than or equal to 1.5; wherein, TTL represents a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging lens, and f represents an effective focal length of the optical imaging lens.

When the relation is satisfied, the total length of the lens and the effective focal length of the lens can be reasonably configured, so that the miniaturization of the lens can be realized while the wide visual angle of the lens is ensured.

In one embodiment, the optical imaging lens satisfies the following relation:

TTL/ImgH is more than or equal to 1 and less than or equal to 2; wherein, TTL represents a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging lens, and ImgH represents a half of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens.

When the relation is met, the total length and the image height of the lens can be reasonably configured, so that the miniaturization of the lens is guaranteed, and meanwhile, the lens system meets the imaging requirement of high resolution.

In one embodiment, the optical imaging lens satisfies the following relation:

f5/f is more than or equal to 0.5 and less than or equal to 1.5; wherein f5 denotes an effective focal length of the fifth lens, and f denotes an effective focal length of the optical imaging lens.

When the above relation is satisfied, the refractive power of the fifth lens element can be reasonably distributed, so that the spherical aberration of the off-axis light rays at different aperture positions can be corrected, and the imaging quality can be improved.

In one embodiment, the optical imaging lens satisfies the following relation:

-2. ltoreq. f7/f < 0; wherein f7 denotes an effective focal length of the seventh lens, and f denotes an effective focal length of the optical imaging lens.

When the relationship is satisfied, the refractive power of the seventh lens element can be reasonably distributed, so that astigmatism can be balanced, imaging quality can be improved, the sensitivity of the lens elements can be reduced, the production yield of the lens can be improved, and quality control cost can be reduced.

The application also provides an imaging module.

An imaging module comprises the optical imaging lens and a photosensitive element, wherein the photosensitive element is arranged at the image side of the optical imaging lens.

Above-mentioned imaging module utilizes aforementioned optical imaging lens can shoot and obtain the image that the pixel is high, the visual angle is wide, and imaging module still has miniaturized, lightweight structural feature simultaneously, makes things convenient for the adaptation to like the limited device of size such as cell-phone, flat board and on-vehicle lens.

The application also provides an electronic device.

An electronic device comprises a shell and the imaging module, wherein the imaging module is installed on the shell.

Above-mentioned electronic device utilizes aforementioned imaging module can shoot and obtain the wide, the high image of pixel of visual angle to promote user's shooting experience.

Drawings

Fig. 1 is a schematic structural diagram showing an optical imaging lens according to embodiment 1 of the present application;

fig. 2 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical imaging lens of embodiment 1, respectively;

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

fig. 4 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical imaging lens of embodiment 2, respectively;

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

fig. 6 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical imaging lens of embodiment 3, respectively;

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

fig. 8 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical imaging lens of example 4, respectively;

fig. 9 is a schematic structural view showing an optical imaging lens according to embodiment 5 of the present application;

fig. 10 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical imaging lens of example 5, respectively;

fig. 11 is a schematic structural view showing an optical imaging lens according to embodiment 6 of the present application;

fig. 12 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical imaging lens of example 6, respectively;

fig. 13 is a schematic structural view showing an optical imaging lens according to embodiment 7 of the present application;

fig. 14 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical imaging lens of example 7;

fig. 15 shows a schematic structural diagram of an imaging module according to an embodiment of the present application.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "upper," "lower," "front," "rear," "circumferential," and the like are based on the orientation or positional relationship shown in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the present description, the expressions first, second, third and the like are used only for distinguishing one feature from another feature, and do not indicate 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. For ease of illustration, 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.

In this specification, a space on a side of the optical element where the object is located is referred to as an object side of the optical element, and correspondingly, a space on a side of the optical element where the object is located is referred to as an image side of the optical element. The surface of each lens closest to the object is called the object side surface, and the surface of each lens closest to the image plane is called the image side surface. And defines the positive direction with distance from the object side to the image side.

In addition, in the following description, if it appears that a lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least near the optical axis; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least at the position near the optical axis. Here, the paraxial region means a region near the optical axis.

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

Referring to fig. 1, fig. 3, fig. 5, fig. 7, fig. 9, fig. 11, and fig. 13, an optical imaging lens with wide viewing angle, high pixel and miniaturization is provided in the present embodiment. Specifically, the optical imaging lens includes seven lens elements with refractive power, namely a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The seven lens elements are arranged in sequence from an object side to an image side along an optical axis, and an imaging surface of the optical imaging lens is positioned at the image side of the seventh lens element.

The first lens has positive refractive power, and the object side surface of the first lens is convex at a position close to the optical axis, so that light rays can be incident into the optical imaging lens, and the light rays are converged to an imaging surface of the lens through refraction of other lenses in the optical imaging lens, so that the imaging quality is improved while the wide visual angle of the lens is ensured.

The second lens element with refractive power has a concave object-side surface, which is favorable for correcting aberration generated by the refraction of light rays through the first lens element, thereby further improving the imaging quality.

The third lens element with refractive power can balance chromatic aberration generated by the light after being refracted by the first lens element and the second lens element, thereby further improving the pixel image quality.

The fourth lens element with refractive power can further converge the light refracted by the third lens element, thereby ensuring the imaging quality.

The fifth lens element with positive refractive power has a convex image-side surface at the paraxial region thereof, thereby being beneficial to correcting spherical aberration of off-axis light rays at different aperture positions and improving imaging quality.

The sixth lens element with refractive power is made of high refractive material, and is favorable for regulating and controlling the refraction of light rays, thereby further improving the imaging quality.

The seventh lens element with negative refractive power has a concave image-side surface at the paraxial region thereof, thereby facilitating balance of astigmatism and image quality, and simultaneously facilitating reduction of lens sensitivity, production yield and production cost.

The optical imaging lens is also provided with a diaphragm, and the diaphragm is arranged at the object side of the optical imaging lens so as to better control the size of an incident beam and improve the imaging quality of the optical imaging lens. Specifically, the diaphragms include an aperture diaphragm and a field diaphragm. Preferably, the diaphragm is an aperture diaphragm. The aperture stop may be located on a surface of the lens (e.g., the object side and the image side) and in operative relationship with the lens, for example, by applying a light blocking coating to the surface of the lens to form the aperture stop at the surface; or the surface of the clamping lens is fixedly clamped by the clamping piece, and the structure of the clamping piece on the surface can limit the width of the imaging light beam of the on-axis object point, so that the aperture stop is formed on the surface.

Specifically, the optical imaging lens satisfies the following relation:

(SAG51+ SAG52)/(SAG61+ SAG62) is less than or equal to 1; SAG51 represents the distance from the intersection point of the object side surface of the fifth lens and the optical axis to the position of the maximum effective aperture of the object side surface of the fifth lens in the optical axis direction, SAG52 represents the distance from the intersection point of the image side surface of the fifth lens and the optical axis to the position of the maximum effective aperture of the image side surface of the fifth lens in the optical axis direction, SAG61 represents the distance from the intersection point of the object side surface of the sixth lens and the optical axis to the position of the maximum effective aperture of the object side surface of the sixth lens in the optical axis direction, and SAG62 represents the distance from the intersection point of the image side surface of the sixth lens and the optical axis to the position of the maximum effective aperture of the image side surface of. (SAG51+ SAG52)/(SAG61+ SAG62) may be 0.6, 0.64, 0.68, 0.72, 0.76, 0.8, 0.84, 0.88, 0.92, 0.96 or 1. Under the condition of satisfying the relational expression, the distortion is effectively controlled while the wide visual angle of the lens is ensured, the processing sensitivity of the lens is reduced, and the production yield is improved. And when (SAG51+ SAG52)/(SAG61+ SAG62) is more than 1, it is easy to cause the difference in the degree of curvature of the fifth lens and the sixth lens to be too large, which is disadvantageous in distortion control, and is also disadvantageous in molding and assembling of the lenses.

Further, the above relation satisfies: 0.64 is less than or equal to (SAG51+ SAG52)/(SAG61+ SAG62) is less than or equal to 0.93, so that the wide-angle characteristic and imaging distortion of the lens are well balanced, and the imaging quality is ensured.

When the optical imaging lens is used for imaging, light rays emitted or reflected by a shot object enter the optical imaging lens from the object side direction, sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, and finally converge on an imaging surface.

Above-mentioned optical imaging lens through select the lens of suitable quantity and the effective focal length of the refractive power of each lens of rational distribution, face type and each lens, can be in guaranteeing optical imaging lens strengthens the formation of image analytic ability and effectively revises the aberration of camera lens when wide-angle, the miniaturization, makes it catch scenery details more accurately, promotes the imaging quality.

In an exemplary embodiment, the optical imaging lens satisfies the following relation:

sigma ETA/TTL is less than or equal to 0.5; where Σ ETA represents the sum of distances in the optical axis direction from the maximum effective aperture of the image-side surface of the preceding lens to the maximum effective aperture of the object-side surface of the subsequent lens in each of the adjacent lenses of the first lens to the seventh lens, and TTL represents the distance on the optical axis from the object-side surface of the first lens to the image plane of the optical imaging lens. Σ ETA/TTL can be 0.12, 0.14, 0.16, 0.18, 0.19, 0.2, 0.21, 0.3, 0.4, or 0.5. Under the condition of satisfying the above relational expression, the air space between the maximum effective apertures of the adjacent lenses in the optical imaging lens and the total lens length can be reasonably configured, so that the arrangement structure of the optical imaging lens is more compact, and the miniaturization of the lens is realized. When Σ ETA/TTL is greater than 0.5, the lenses are far apart, which is likely to cause decentering, and also is not beneficial to shortening the total lens length.

Further, the above relation satisfies: sigma ETA/TTL is more than or equal to 0.14 and less than or equal to 0.22, so that the arrangement among the lenses is more compact while the imaging quality is ensured, and the miniaturization is ensured.

3mm/deg is less than or equal to 100 ∑ CT/FOV is less than or equal to 5 mm/deg; where Σ CT denotes the sum of thicknesses of the respective first to seventh lenses on the optical axis, and FOV denotes the field angle in the diagonal direction of the optical imaging lens. The 100 ∑ CT/FOV may be 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.2, 4.4, 4.6, or 4.8, in units of (mm/deg). Under the condition of satisfying the above relational expression, the thickness of each lens on the optical axis and the angle of field of the lens in the diagonal direction can be reasonably configured in the optical imaging lens, so that the thickness of each lens can be effectively compressed while the wide angle of field of the lens is ensured, and the miniaturization of the lens is realized. When the 100 sigma-delta CT/FOV is less than 3, the imaging quality of the edge viewing angle is difficult to ensure; when the 100 ∑ CT/FOV is larger than 5, the thickness of each lens is large, which is disadvantageous for miniaturization.

Further, the above relation satisfies: 3.61 is less than or equal to 100 sigma CT/FOV is less than or equal to 4.64, so that the field angle and the thickness of each lens are balanced better, and miniaturization is guaranteed.

Y61-Y52 is more than or equal to 0 and less than or equal to 0.5 mm; y52 represents the maximum effective aperture of the image-side surface of the fifth lens element, and Y61 represents the maximum effective aperture of the object-side surface of the sixth lens element. Y61-Y52 may be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 0.5 mm. Under the condition of meeting the relational expression, the wide-angle and miniaturization of the optical imaging lens are favorably realized, and the arrangement of all lenses in the lens is also favorably more compact, so that related components such as a spacer and the like can be avoided, the production cost of the lens is favorably reduced, the production overtime is shortened, and the production profit and the product delivery rate are ensured; in addition, the compact arrangement structure is also favorable for shortening the air interval from the maximum effective caliber position of the fifth lens to the maximum effective caliber position of the sixth lens, and the use of a spacer is avoided, so that the generation of stray light is greatly reduced, the generation probability of ghost images is reduced, and the imaging quality of the lens is improved. When Y61-Y52 is less than 0, light imaging at edge viewing angles is not facilitated, and imaging quality is easily reduced; when Y61-Y52 is larger than 0.5mm, the difference between the effective aperture of the fifth lens and the effective aperture of the sixth lens is larger, so that stray light is easily formed, and the imaging quality is reduced.

Further, the above relation satisfies: Y61-Y52 are more than or equal to 0.11mm and less than or equal to 0.35mm, so that the distance between the fifth lens and the sixth lens is more reasonably shortened, the generation of stray light is avoided, the miniaturization is ensured, and the production cost is reduced.

1 is more than or equal to (CT6+ CT7)/CT5 is less than or equal to 2; where CT5 denotes a thickness of the fifth lens on the optical axis, CT6 denotes a thickness of the sixth lens on the optical axis, and CT7 denotes a thickness of the seventh lens on the optical axis. (CT6+ CT7)/CT5 may be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, or 1.9. Under the condition that the relational expression is satisfied, the thicknesses of the fifth, sixth and seventh lenses on the optical axis can be reasonably arranged, so that the field angle can be enlarged, the aberration can be effectively inhibited, and the imaging quality can be improved. When (CT6+ CT7)/CT5 is lower than the lower limit or higher than the upper limit, it is difficult to balance between the wide angle of view and the aberration suppression.

Further, the above relation satisfies: 1 ≦ (CT6+ CT7)/CT5 ≦ 1.49 to more reasonably set the lens thickness, thereby better balancing the relationship between the lens wide angle of view characteristics and aberration suppression.

(ET2+ ET3)/(CT2+ CT3) is less than or equal to 1.5; wherein ET2 denotes a distance in the optical axis direction from the maximum effective aperture of the object-side surface of the second lens to the maximum effective aperture of the image-side surface thereof, ET3 denotes a distance in the optical axis direction from the maximum effective aperture of the object-side surface of the third lens to the maximum effective aperture of the image-side surface thereof, CT2 denotes a thickness of the second lens in the optical axis, and CT3 denotes a thickness of the third lens in the optical axis. (ET2+ ET3)/(CT2+ CT3) may be 1, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4 or 1.45. Under the condition of satisfying the relational expression, the wide angle of the lens is facilitated, and meanwhile, the light can be stably transited, so that the generation of stray light among lenses is reduced, and the generation probability of ghost images is reduced; in addition, the central thickness and the thickness of the maximum effective caliber position of the second lens and the central thickness and the thickness of the maximum effective caliber position of the third lens are reasonably configured, so that the sensitivity of the lenses can be effectively reduced, the lenses are convenient to form and assemble, the production yield is improved, and the quality control cost is reduced. And when (ET2+ ET3)/(CT2+ CT3) is greater than 1.5, the air space at the maximum effective aperture of the second lens and the third lens is too large, which easily causes the lenses to be over-bent, thus being not beneficial to the molding and assembly of the lenses, and also being not beneficial to the smooth transition of light rays, easily forming stray light and reducing the imaging quality.

Further, the above relation satisfies: 1.02 is less than or equal to (ET2+ ET3)/(CT2+ CT3) is less than or equal to 1.11 to set up the thickness and the center thickness of the maximum effective bore department of second lens and third lens more rationally, thereby guarantee the imaging quality, make things convenient for the shaping and the equipment of lens, improve production yield.

TTL/f is more than or equal to 1 and less than or equal to 1.5; wherein, TTL represents a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging lens, and f represents an effective focal length of the optical imaging lens. TTL/f can be 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, or 1.5. Under the condition of satisfying the above relational expression, the total length of the lens and the effective focal length of the lens can be reasonably configured, thereby being beneficial to realizing miniaturization while ensuring the wide visual angle of the lens. When TTL/f is less than 1, the effective focal length of the lens is too large, which is not beneficial to wide angle; and when TTL/f is more than 1.5, the total length of the lens is larger, which is not beneficial to miniaturization.

Further, the above relation satisfies: TTL/f is more than or equal to 1.3 and less than or equal to 1.39 so as to better balance the total length of the lens and the effective focal length of the lens, thereby realizing miniaturization while ensuring the wide visual angle of the lens.

TTL/ImgH is more than or equal to 1 and less than or equal to 2; wherein, TTL represents a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging lens, and ImgH represents a half of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens. TTL/ImgH can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2. Under the condition of meeting the relational expression, the total length and the image height of the lens can be reasonably configured, so that the miniaturization of the lens is ensured, and meanwhile, the lens system meets the imaging requirement of high resolution. When TTL/ImgH is less than 1, the image height is larger, and the resolution of the lens is easy to reduce; and when TTL/ImgH is more than 2, the total length of the lens is larger, which is not beneficial to miniaturization.

Further, the above relation satisfies: TTL/ImgH is more than or equal to 1.34 and less than or equal to 1.52, so that the total length and the image height of the lens are well balanced, and the wide-angle lens has high resolution performance.

In an exemplary embodiment, the optical imaging lens satisfies the following relation: f5/f is more than or equal to 0.5 and less than or equal to 1.5; where f5 denotes an effective focal length of the fifth lens, and f denotes an effective focal length of the optical imaging lens. f5/f may be 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4 or 1.5. Under the condition of satisfying the above relational expression, the refractive power of the fifth lens element can be reasonably distributed, thereby being beneficial to correcting the spherical aberration of the off-axis light rays at different aperture positions and improving the imaging quality. When f5/f is smaller than 0.5, the refractive power of the fifth lens element is too large, which is prone to over-correction and reduces the imaging quality; when f5/f is greater than 1.5, the refractive power of the fifth lens element is small, which is prone to insufficient correction and reduces the image quality.

Further, the above relation satisfies: f5/f is more than or equal to 0.71 and less than or equal to 1.19, so that the refractive power of the fifth lens element can be more reasonably selected, the spherical aberration of the off-axis field light can be better corrected, and the imaging quality can be improved.

In an exemplary embodiment, the optical imaging lens satisfies the following relation: -2. ltoreq. f7/f < 0; where f7 denotes an effective focal length of the seventh lens, and f denotes an effective focal length of the optical imaging lens. f7/f can be-1.8, -1.6, -1.4, -1.2, -1, -0.9, -0.8 or-0.6. Under the condition of satisfying the relation, the refractive power of the seventh lens element can be reasonably distributed, so that astigmatism can be balanced, imaging quality can be improved, the sensitivity of the lens elements can be reduced, the production yield of the lens can be improved, and quality control cost can be reduced. When f7/f is smaller than-2, the refractive power of the seventh lens element is smaller, which is not favorable for correcting the aberration of the lens and reducing the sensitivity of the lens; when f7/f is greater than or equal to 0, negative refractive power cannot be provided for the lens, which is not favorable for imaging.

Further, the above relation satisfies: f7/f is more than or equal to 1.49 and less than or equal to-0.82, so as to more reasonably select the refractive power of the seventh lens element, thereby better balancing astigmatism, improving the imaging quality, reducing the sensitivity of the lens element and improving the production yield of the lens element.

In an exemplary embodiment, an object-side surface and/or an image-side surface of at least one of the first lens to the seventh lens is aspheric. By the mode, the flexibility of lens design can be improved, aberration can be effectively corrected, and the imaging quality of the optical imaging lens is improved. It should be noted that the surfaces of the lenses in the optical imaging lens may also be any combination of spherical surfaces and aspherical surfaces, and are not necessarily all spherical surfaces or all aspherical surfaces.

In an exemplary embodiment, each lens in the optical imaging lens may be made of glass or plastic, the plastic lens can reduce the weight and production cost of the optical imaging lens, and the glass lens can provide the optical imaging lens with good temperature tolerance and excellent optical performance. Furthermore, when the lens is used for light and thin electronic devices such as mobile phones and flat panels, the material of each lens is preferably plastic, so as to reduce the weight of the device better. It should be noted that the material of each lens in the optical imaging lens may also be any combination of glass and plastic, and is not necessarily all glass or all plastic.

In an exemplary embodiment, the optical imaging lens further includes an infrared filter. The infrared filter is arranged at the image side of the sixth lens and used for filtering incident light, particularly isolating infrared light and preventing the infrared light from being absorbed by the photosensitive element, so that the influence of the infrared light on the color and the definition of a normal image is avoided, and the imaging quality of the optical imaging lens is improved.

In an exemplary embodiment, the optical imaging lens may further include a protective glass. The protective glass is arranged at the image side of the infrared filter, plays a role of protecting the photosensitive element, and can also prevent the photosensitive element from being polluted and dust falling, thereby further ensuring the imaging quality. It should be noted that, when the protective glass is applied to portable electronic devices such as mobile phones and tablet computers, in order to ensure the lightness and thinness of the device, the protective glass may not be set, and the application does not limit the device.

The optical imaging lens of the above-described embodiment of the present application may employ a plurality of lenses, for example, seven lenses as described above. Through reasonable distribution of focal length, refractive power, surface type, thickness of each lens, on-axis distance between each lens and the like, the total length of the optical imaging lens is small, the optical imaging lens is light in weight and has high imaging resolution, and meanwhile, the optical imaging lens further has a large aperture (FNO can be 1.88) and a large field angle, so that the application requirements of light-weight electronic equipment such as a mobile phone and a flat panel are better met. 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.

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 100 according to embodiment 1 of the present application is described below with reference to fig. 1 to 2.

Fig. 1 shows a schematic configuration diagram of an optical imaging lens 100 of embodiment 1. As shown in fig. 1, the optical imaging lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7, and an image plane S17.

The first lens element L1 with positive refractive power has an object-side surface S1 and an image-side surface S2 that are aspheric, wherein the object-side surface S1 is convex along an optical axis and convex along a circumference, and the image-side surface S2 is concave along the optical axis and concave along the circumference.

The second lens element L2 with positive refractive power has an object-side surface S3 and an image-side surface S4 that are aspheric, wherein the object-side surface S3 is convex along the optical axis and convex along the circumference, and the image-side surface S4 is concave along the optical axis and concave along the circumference.

The third lens element L3 with negative refractive power has an object-side surface S5 and an image-side surface S6 that are aspheric, wherein the object-side surface S5 is concave along the optical axis and concave along the circumference, and the image-side surface S6 is convex along the optical axis and convex along the circumference.

The fourth lens element L4 with negative refractive power has an object-side surface S7 and an image-side surface S8 that are aspheric, wherein the object-side surface S7 is concave along the optical axis and concave along the circumference, and the image-side surface S8 is convex along the optical axis and convex along the circumference.

The fifth lens element L5 with positive refractive power has an object-side surface S9 and an image-side surface S10 that are aspheric, wherein the object-side surface S9 is concave along the optical axis and concave along the circumference, and the image-side surface S10 is convex along the optical axis and convex along the circumference.

The sixth lens element L6 with negative refractive power has an object-side surface S11 and an image-side surface S12 that are aspheric, wherein the object-side surface S11 is concave along the optical axis and concave along the circumference, and the image-side surface S12 is concave along the optical axis and convex along the circumference.

The seventh lens element L7 with negative refractive power has an object-side surface S13 and an image-side surface S14 that are aspheric, wherein the object-side surface S13 is convex along an optical axis and convex along a circumference, and the image-side surface S14 is concave along the optical axis and convex along the circumference.

The object-side surface and the image-side surface of each of the first lens element L1 to the seventh lens element L7 are aspheric, which is advantageous for correcting aberrations and solving the problem of image surface distortion, and enables the lens elements to achieve excellent optical imaging effects even when the lens elements are small, thin, and flat, thereby enabling the optical imaging lens system 100 to have a compact size.

The first lens L1 to the sixth lens L7 are made of plastic, and the use of plastic lenses can reduce the weight of the optical imaging lens 100 and reduce the production cost.

The object side of the optical imaging lens 100 is further provided with a stop STO to limit the size of the incident light beam, and further improve the imaging quality of the optical imaging lens 100. The optical imaging lens 100 further includes a filter 110 disposed on the image side of the seventh lens L7 and having an object-side surface S15 and an image-side surface S16. Light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging plane S17. Further, the optical filter 110 is an infrared filter for filtering out infrared light from the external light incident on the optical imaging lens 100, so as to avoid color distortion. Specifically, the material of the filter 110 is glass.

Table 1 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of the lens of the optical imaging lens 100 of embodiment 1, wherein the unit of the radius of curvature, thickness, and effective focal length of the lens is millimeters (mm). In addition, taking the first lens element L1 as an example, the first numerical value in the "thickness" parameter sequence of the first lens element L1 is the thickness of the lens element on the optical axis, and the second numerical value is the distance between the image-side surface of the lens element and the object-side surface of the subsequent lens element in the image-side direction; the numerical value of the stop ST0 in the "thickness" parameter column is the distance on the optical axis from the stop ST0 to the vertex of the object-side surface of the subsequent lens (the vertex refers to the intersection point of the lens and the optical axis), and we default that the direction from the object-side surface of the first lens L1 to the image-side surface of the last lens is the positive direction of the optical axis, when the value is negative, it indicates that the stop ST0 is disposed on the right side of the vertex of the object-side surface of the lens in fig. 1, and when the thickness of the stop STO is positive, the stop is on the left side of the vertex of the object-.

TABLE 1

The aspherical surface shape in the lens is defined by the following 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); k is a conic coefficient; ai is the ith order coefficient of the aspheric surface. Table 2 below gives the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the aspherical surfaces S1 to S14 of the lens in example 1.

TABLE 2

The distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S17 of the optical imaging lens 100 is 5.47mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging lens 100 is 4 mm. As can be seen from the data in tables 1 and 2, the optical imaging lens 100 in embodiment 1 satisfies:

(SAG51+ SAG52)/(SAG61+ SAG62) ═ 0.641 where SAG51 denotes a distance in the optical axis direction from the intersection of the object-side surface S9 of the fifth lens L5 with the optical axis to the maximum effective aperture of the object-side surface S9 of the fifth lens L5, SAG52 denotes a distance in the optical axis direction from the intersection of the image-side surface S10 of the fifth lens L5 with the optical axis to the maximum effective aperture of the image-side surface S10 of the fifth lens L5, SAG61 denotes a distance in the optical axis direction from the intersection of the object-side surface S11 of the sixth lens L6 with the optical axis to the maximum effective aperture of the object-side surface S11 of the sixth lens L6, and SAG62 from the intersection of the image-side surface S12 of the sixth lens L6 with the optical axis to the maximum effective aperture of the image-side surface S12 of the sixth lens L6;

Σ ETA/TTL is 0.14, where Σ ETA represents the sum of distances in the optical axis direction from the image-side surface maximum effective aperture of the preceding lens to the object-side surface maximum effective aperture of the subsequent lens in each of the adjacent lenses of the first lens L1 to the seventh lens L7, and TTL represents the distance in the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface S17 of the optical imaging lens 100;

100 ∑ CT/FOV is 3.731mm/deg, where Σ CT denotes the sum of thicknesses of the respective lenses of the first lens L1 to the seventh lens L7 on the optical axis, and FOV denotes a diagonal angle of view of the optical imaging lens 100;

Y61-Y52 is 0.114mm, where Y52 denotes the maximum effective aperture of the image-side surface S10 of the fifth lens L5, and Y61 denotes the maximum effective aperture of the object-side surface S11 of the sixth lens L6;

(CT6+ CT7)/CT5 is 1.105, where CT5 denotes a thickness of the fifth lens L5 on the optical axis, CT6 denotes a thickness of the sixth lens L6 on the optical axis, and CT7 denotes a thickness of the seventh lens L7 on the optical axis;

(ET2+ ET3)/(CT2+ CT3) ═ 1.022, where ET2 denotes a distance in the optical axis direction from the maximum effective aperture of the object-side surface S3 of the second lens L2 to the maximum effective aperture of the image-side surface S4 thereof, ET3 denotes a distance in the optical axis direction from the maximum effective aperture of the object-side surface S5 of the third lens L3 to the maximum effective aperture of the image-side surface S6 thereof, CT2 denotes a thickness of the second lens L2 in the optical axis, and CT3 denotes a thickness of the third lens L3 in the optical axis;

TTL/f is 1.302, where TTL denotes an optical axis distance from the object-side surface S1 of the first lens L1 to the imaging surface S17 of the optical imaging lens 100, and f denotes an effective focal length of the optical imaging lens 100;

TTL/ImgH is 1.368, where TTL denotes an optical axis distance from the object side surface S1 of the first lens L1 to the imaging surface S17 of the optical imaging lens 100, and ImgH denotes a half of a diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging lens 100;

f5/f is 0.8, where f5 denotes an effective focal length of the fifth lens L5, and f denotes an effective focal length of the optical imaging lens 100;

f7/f is-1.138, where f7 denotes an effective focal length of the seventh lens L7, and f denotes an effective focal length of the optical imaging lens.

Fig. 2 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical imaging lens 100 of embodiment 1, respectively, and the reference wavelength of the optical imaging lens 100 is 555 nm. Wherein the longitudinal spherical aberration plots show the deviation of the convergence focus of light rays with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm after passing through the optical imaging lens 100; the astigmatism graph shows meridional image surface curvature and sagittal image surface curvature of the light with the wavelength of 555nm after passing through the optical imaging lens 100; the distortion graph shows the distortion of light with a wavelength of 555nm at different image heights after passing through the optical imaging lens 100. As can be seen from fig. 2, the optical imaging lens 100 according to embodiment 1 can achieve good imaging quality.

Example 2

An optical imaging lens 100 according to embodiment 2 of the present application is described below with reference to fig. 3 to 4. In this embodiment, a description 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 100 according to embodiment 2 of the present application.

As shown in fig. 3, the optical imaging lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7, and an image plane S17.

The fourth lens element L4 with negative refractive power has an object-side surface S7 and an image-side surface S8 that are aspheric, wherein the object-side surface S7 is concave along the optical axis and concave along the circumference, and the image-side surface S8 is concave along the optical axis and convex along the circumference.

The object-side surface and the image-side surface of the first lens L1 through the seventh lens L7 are each set to an aspherical surface. The first lens L1 to the sixth lens L7 are all made of plastic. The object side of the optical imaging lens 100 is further provided with a stop STO to limit the size of the incident light beam, and further improve the imaging quality of the optical imaging lens 100. The optical imaging lens 100 further includes an infrared filter 110 disposed on the image side of the seventh lens L7 and having an object-side surface S15 and an image-side surface S16.

Table 3 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical imaging lens 100 of embodiment 2, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 4 shows high-order term coefficients that can be used for the lens aspheres S1-S14 in example 2, in which the aspherical surface types can be defined by formula (1) given in example 1; table 5 shows the values of relevant parameters of the optical imaging lens 100 given in embodiment 2.

TABLE 3

TABLE 4

TABLE 5

Fig. 4 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical imaging lens 100 of embodiment 2, respectively, and the reference wavelength of the optical imaging lens 100 is 555 nm. Wherein the longitudinal spherical aberration plots show the deviation of the convergence focus of light rays with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm after passing through the optical imaging lens 100; the astigmatism graph shows meridional image surface curvature and sagittal image surface curvature of the light with the wavelength of 555nm after passing through the optical imaging lens 100; the distortion graph shows the distortion of light with a wavelength of 555nm at different image heights after passing through the optical imaging lens 100. As can be seen from fig. 4, the optical imaging lens 100 according to embodiment 2 can achieve good imaging quality.

Example 3

An optical imaging lens 100 according to embodiment 3 of the present application is described below with reference to fig. 5 to 6. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 5 shows a schematic structural diagram of an optical imaging lens 100 according to embodiment 3 of the present application.

As shown in fig. 5, the optical imaging lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7, and an image plane S17.

The second lens element L2 with negative refractive power has an object-side surface S3 and an image-side surface S4 that are aspheric, wherein the object-side surface S3 is convex along the optical axis and convex along the circumference, and the image-side surface S4 is concave along the optical axis and concave along the circumference.

Table 6 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical imaging lens 100 of example 3, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 7 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S14 in embodiment 3, wherein the aspherical surface type can be defined by formula (1) given in embodiment 1; table 8 shows the values of relevant parameters of the optical imaging lens 100 given in embodiment 3.

TABLE 6

TABLE 7

TABLE 8

Fig. 6 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical imaging lens 100 of embodiment 3, respectively, and the reference wavelength of the optical imaging lens 100 is 555 nm. Wherein the longitudinal spherical aberration plots show the deviation of the convergence focus of light rays with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm after passing through the optical imaging lens 100; the astigmatism graph shows meridional image surface curvature and sagittal image surface curvature of the light with the wavelength of 555nm after passing through the optical imaging lens 100; the distortion graph shows the distortion of light with a wavelength of 555nm at different image heights after passing through the optical imaging lens 100. As can be seen from fig. 6, the optical imaging lens 100 according to embodiment 3 can achieve good imaging quality.

Example 4

An optical imaging lens 100 according to embodiment 4 of the present application is described below with reference to fig. 7 to 8. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 7 shows a schematic structural diagram of an optical imaging lens 100 according to embodiment 4 of the present application.

As shown in fig. 7, the optical imaging lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7, and an image plane S17.

The third lens element L3 with negative refractive power has an object-side surface S5 and an image-side surface S6 that are aspheric, wherein the object-side surface S5 is convex along the optical axis and concave along the circumference, and the image-side surface S6 is concave along the optical axis and concave along the circumference.

Table 9 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical imaging lens 100 of example 4, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 10 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S14 in embodiment 4, wherein the aspherical surface types can be defined by formula (1) given in embodiment 1; table 11 shows the values of relevant parameters of the optical imaging lens 100 given in embodiment 4.

TABLE 9

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TABLE 11

Fig. 8 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical imaging lens 100 of example 4, respectively, and the reference wavelength of the optical imaging lens 100 is 555 nm. Wherein the longitudinal spherical aberration plots show the deviation of the convergence focus of light rays with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm after passing through the optical imaging lens 100; the astigmatism graph shows meridional image surface curvature and sagittal image surface curvature of the light with the wavelength of 555nm after passing through the optical imaging lens 100; the distortion graph shows the distortion of light with a wavelength of 555nm at different image heights after passing through the optical imaging lens 100. As can be seen from fig. 8, the optical imaging lens 100 according to embodiment 4 can achieve good imaging quality.

Example 5

An optical imaging lens 100 according to embodiment 5 of the present application is described below with reference to fig. 9 to 10. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 9 shows a schematic structural diagram of an optical imaging lens 100 according to embodiment 5 of the present application.

As shown in fig. 9, the optical imaging lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7, and an image plane S17.

The third lens element L3 with positive refractive power has an object-side surface S5 and an image-side surface S6 that are aspheric, wherein the object-side surface S5 is concave along the optical axis and concave along the circumference, and the image-side surface S6 is convex along the optical axis and convex along the circumference.

Table 12 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical imaging lens 100 of example 5, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 13 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S14 in example 5, wherein the aspherical surface type can be defined by formula (1) given in example 1; table 14 shows the values of relevant parameters of the optical imaging lens 100 given in embodiment 5.

TABLE 12

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TABLE 14

Fig. 10 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical imaging lens 100 of example 5, respectively, and the reference wavelength of the optical imaging lens 100 is 555 nm. Wherein the longitudinal spherical aberration plots show the deviation of the convergence focus of light rays with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm after passing through the optical imaging lens 100; the astigmatism graph shows meridional image surface curvature and sagittal image surface curvature of the light with the wavelength of 555nm after passing through the optical imaging lens 100; the distortion graph shows the distortion of light with a wavelength of 555nm at different image heights after passing through the optical imaging lens 100. As can be seen from fig. 10, the optical imaging lens 100 according to embodiment 5 can achieve good imaging quality.

Example 6

An optical imaging lens 100 according to embodiment 6 of the present application is described below with reference to fig. 11 to 12. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 11 shows a schematic structural diagram of an optical imaging lens 100 according to embodiment 6 of the present application.

As shown in fig. 11, the optical imaging lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7, and an image plane S17.

The second lens element L2 with positive refractive power has an object-side surface S3 and an image-side surface S4 that are aspheric, wherein the object-side surface S3 is convex along an optical axis and convex along a circumference, and the image-side surface S4 is convex along the optical axis and concave along the circumference.

The third lens element L3 with negative refractive power has an object-side surface S5 and an image-side surface S6 that are aspheric, wherein the object-side surface S5 is concave along the optical axis and concave along the circumference, and the image-side surface S6 is concave along the optical axis and convex along the circumference.

The fourth lens element L4 with positive refractive power has an object-side surface S7 and an image-side surface S8 that are aspheric, wherein the object-side surface S7 is concave along the optical axis and concave along the circumference, and the image-side surface S8 is convex along the optical axis and convex along the circumference.

Table 15 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical imaging lens 100 of example 6, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 16 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S14 in example 6, wherein the aspherical surface types can be defined by formula (1) given in example 1; table 17 shows the values of relevant parameters of the optical imaging lens 100 given in embodiment 6.

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TABLE 16

TABLE 17

Fig. 12 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical imaging lens 100 of example 6, the reference wavelength of the optical imaging lens 100 being 555 nm. Wherein the longitudinal spherical aberration plots show the deviation of the convergence focus of light rays with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm after passing through the optical imaging lens 100; the astigmatism graph shows meridional image surface curvature and sagittal image surface curvature of the light with the wavelength of 555nm after passing through the optical imaging lens 100; the distortion graph shows the distortion of light with a wavelength of 555nm at different image heights after passing through the optical imaging lens 100. As can be seen from fig. 12, the optical imaging lens 100 according to embodiment 6 can achieve good imaging quality.

Example 7

An optical imaging lens 100 of embodiment 7 of the present application is described below with reference to fig. 13 to 14. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 13 is a schematic structural view showing an optical imaging lens 100 according to embodiment 7 of the present application.

As shown in fig. 13, the optical imaging lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7, and an image plane S17.

The sixth lens element L6 with positive refractive power has an object-side surface S11 and an image-side surface S12 that are aspheric, wherein the object-side surface S11 is convex along an optical axis and concave along a circumference, and the image-side surface S12 is concave along the optical axis and convex along the circumference.

Table 18 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical imaging lens 100 of example 7, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 19 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S14 in example 7, wherein the aspherical surface types can be defined by formula (1) given in example 1; table 20 shows the values of relevant parameters of the optical imaging lens 100 given in embodiment 7.

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Fig. 14 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical imaging lens 100 of example 7, the reference wavelength of the optical imaging lens 100 being 555 nm. Wherein the longitudinal spherical aberration plots show the deviation of the convergence focus of light rays with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm after passing through the optical imaging lens 100; the astigmatism graph shows meridional image surface curvature and sagittal image surface curvature of the light with the wavelength of 555nm after passing through the optical imaging lens 100; the distortion graph shows the distortion of light with a wavelength of 555nm at different image heights after passing through the optical imaging lens 100. As can be seen from fig. 14, the optical imaging lens 100 according to embodiment 7 can achieve good imaging quality.

As shown in fig. 15, the present application further provides an imaging module 200, which includes the optical imaging lens 100 (shown in fig. 1) as described above; and a photosensitive element 210, the photosensitive element 210 being disposed on the image side of the optical imaging lens 100, the photosensitive surface of the photosensitive element 210 coinciding with the image plane S17. Specifically, the photosensitive element 210 may be a Complementary Metal Oxide Semiconductor (CMOS) image sensor or a Charge-coupled Device (CCD) image sensor.

The imaging module 200 can capture images with high pixels and wide viewing angles by using the optical imaging lens 100, and the imaging module 200 has the structural characteristics of miniaturization and light weight. The imaging module 200 can be applied to the fields of mobile phones, automobiles, monitoring, medical treatment and the like. The system can be used as a mobile phone camera, a vehicle-mounted camera, a monitoring camera or an endoscope and the like.

The present application further provides an electronic device, which includes a housing and the imaging module 200 as described above, wherein the imaging module 200 is mounted on the housing. Specifically, imaging module 200 sets up in the casing and exposes in order to acquire the image from the casing, and the casing can provide protection such as dustproof, waterproof falling of preventing for imaging module 200, offers the hole that corresponds with imaging module 200 on the casing to make light penetrate or wear out the casing from the hole.

Above-mentioned electronic device utilizes aforementioned imaging module 200 can shoot and obtain the wide, high image of pixel of visual angle to promote user's shooting experience.

In other embodiments, the use of "electronic device" may also include, but is not limited to, devices configured to receive or transmit communication signals via a wireline connection and/or via a wireless interface. Electronic devices arranged to communicate over a wireless interface may be referred to as "wireless communication terminals", "wireless terminals", or "mobile terminals". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communication System (PCS) terminals that may combine a cellular radiotelephone with data processing, facsimile and data communication capabilities; personal Digital Assistants (PDAs) that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An optical imaging lens, in order from an object side to an image side along an optical axis, comprising:

a diaphragm;

the optical lens comprises a first lens element with positive refractive power, and a second lens element with positive refractive power, wherein the object-side surface of the first lens element is convex at the paraxial region;

a second lens element with refractive power;

a third lens element with refractive power;

a fourth lens element with refractive power;

the fifth lens element with positive refractive power has a convex image-side surface at a paraxial region;

a sixth lens element with refractive power; and the number of the first and second groups,

the seventh lens element with negative refractive power has a concave image-side surface at the paraxial region;

the optical imaging lens satisfies the following relational expression:

(SAG51+SAG52)/(SAG61+SAG62)≤1；

2. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following relation:

∑ETA/TTL≤0.5；

Σ ETA represents the sum of distances in the optical axis direction from the maximum effective aperture of the image side surface of the preceding lens to the maximum effective aperture of the object side surface of the subsequent lens in each of the adjacent lenses of the first lens to the seventh lens, and TTL represents the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens.

3. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following relation:

3mm/deg≤100*∑CT/FOV≤5mm/deg；

wherein Σ CT represents the sum of thicknesses of the respective lenses of the first lens to the seventh lens on the optical axis, and FOV represents the field angle in the diagonal direction of the optical imaging lens.

4. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following relation:

0≤Y61-Y52≤0.5mm；

wherein Y52 represents the maximum effective aperture of the image-side surface of the fifth lens, and Y61 represents the maximum effective aperture of the object-side surface of the sixth lens.

5. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following relation:

1≤(CT6+CT7)/CT5≤2；

wherein CT5 denotes a thickness of the fifth lens on an optical axis, CT6 denotes a thickness of the sixth lens on an optical axis, and CT7 denotes a thickness of the seventh lens on an optical axis.

6. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following relation:

(ET2+ET3)/(CT2+CT3)≤1.5；

wherein ET2 represents a distance in an optical axis direction from a maximum effective aperture of an object-side surface of the second lens to a maximum effective aperture of an image-side surface thereof, ET3 represents a distance in the optical axis direction from a maximum effective aperture of an object-side surface of the third lens to a maximum effective aperture of an image-side surface thereof, CT2 represents a thickness of the second lens in the optical axis, and CT3 represents a thickness of the third lens in the optical axis.

7. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following relation:

1≤TTL/f≤1.5；

wherein, TTL represents a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging lens, and f represents an effective focal length of the optical imaging lens.

8. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following relation:

1≤TTL/ImgH≤2；

wherein, TTL represents a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging lens, and ImgH represents a half of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens.

9. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following relation:

0.5≤f5/f≤1.5；

wherein f5 denotes an effective focal length of the fifth lens, and f denotes an effective focal length of the optical imaging lens.

10. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following relation:

-2≤f7/f＜0；

wherein f7 denotes an effective focal length of the seventh lens, and f denotes an effective focal length of the optical imaging lens.

11. An imaging module comprising the optical imaging lens according to any one of claims 1 to 10 and a photosensitive element, wherein the photosensitive element is disposed on an image side of the optical imaging lens.

12. An electronic device comprising a housing and the imaging module of claim 11, wherein the imaging module is mounted on the housing.