CN214795386U - Optical imaging lens - Google Patents

Abstract

The application discloses an optical imaging lens, which sequentially comprises from an object side to an image side along an optical axis: a first lens having an optical power; a second lens having a positive optical power; a third lens having a positive optical power; a fourth lens having a negative optical power; a fifth lens having a positive optical power; a sixth lens having optical power; and a seventh lens having optical power. At least four lenses of the first lens to the fifth lens are made of plastic materials; the sixth lens is a spherical lens made of glass; and the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and the total effective focal length f of the optical imaging lens meet the following requirements: TTL/f is more than 2.0 and less than 4.0.

Description

Optical imaging lens

Technical Field

The application relates to the field of optical elements, in particular to an optical imaging lens.

Background

As video monitoring products gradually develop towards high-definition imaging, the video monitoring products have developed from the first 30 ten thousand pixels to nearly 300 ten thousand pixels, and the global video monitoring technology is facing a technological innovation. Meanwhile, a monitoring lens as a core component of video monitoring starts to enter a stage of high-speed development.

At present, security monitoring systems are widely used in monitoring of road traffic, industry, production, hospitals, airports, libraries and other public places, wherein an optical imaging lens plays an important role in the security monitoring system. How to implement an optical imaging lens with characteristics of lower cost, higher pixels and the like by reasonably matching key technical parameters such as focal power, material and the like of each lens in the optical imaging lens on the basis of the prior art becomes one of the problems to be solved by many lens designs at present.

SUMMERY OF THE UTILITY MODEL

The present application provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a first lens having an optical power; a second lens having a positive optical power; a third lens having a positive optical power; a fourth lens having a negative optical power; a fifth lens having a positive optical power; a sixth lens having optical power; and a seventh lens having optical power. At least four lenses of the first lens to the fifth lens are made of plastic materials; the sixth lens is a spherical lens made of glass; and the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and the total effective focal length f of the optical imaging lens can meet the following requirements: TTL/f is more than 2.0 and less than 4.0.

In one embodiment, at least one mirror surface of the object side surface of the first lens to the image side surface of the seventh lens is an aspherical mirror surface.

In one embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens satisfy: -3.6 < f1/f < -2.2.

In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f7 of the seventh lens may satisfy: f4/f7 is more than 0.4 and less than 1.7.

In one embodiment, the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens may satisfy: 0.2 < (f5+ f6)/f3 < 2.4.

In one embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens may satisfy: -0.7 < (R1+ R2)/(R3+ R4) < -0.3.

In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens may satisfy: 1.7 < R7/R8 < 2.8.

In one embodiment, the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R10 of the image-side surface of the fifth lens may satisfy: 0 < (R9+ R10)/(R9-R10) < 0.6.

In one embodiment, a combined focal length f67 of the sixth lens and the seventh lens, a radius of curvature R11 of an object-side surface of the sixth lens, and a radius of curvature R14 of an image-side surface of the seventh lens may satisfy: 1.0 < f67/(R11+ R14) < 4.5.

In one embodiment, a distance T12 between the first lens and the second lens on the optical axis, a distance SAG11 on the optical axis from an intersection point of the object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens, and a distance SAG12 on the optical axis from an intersection point of the image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens may satisfy: 0.8 < T12/(SAG11+ SAG12) < 1.4.

In one embodiment, the central thickness CT2 of the second lens on the optical axis, the distance SAG21 on the optical axis from the intersection point of the object-side surface of the second lens and the optical axis to the effective radius vertex of the object-side surface of the second lens, and the distance SAG22 on the optical axis from the intersection point of the image-side surface of the second lens and the optical axis to the effective radius vertex of the image-side surface of the second lens may satisfy: 2.9 < CT2/(SAG21-SAG22) < 6.0.

In one embodiment, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, and the edge thickness ET7 of the seventh lens may satisfy: 0.5 < (ET4+ ET5)/(ET6+ ET7) < 1.3.

In one embodiment, the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens may satisfy: f/EPD < 1.2.

In one embodiment, a sum Σ CT of center thicknesses of the first to seventh lenses on the optical axis and a sum Σ AT of separation distances of any adjacent two lenses of the first to seventh lenses on the optical axis may satisfy: 2.6 < ∑ CT/Σ AT < 4.2.

In one embodiment, the optical imaging lens further includes a diaphragm. The distance SL of the diaphragm to the imaging surface of the optical imaging lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the central thickness CT5 of the fifth lens on the optical axis, the central thickness CT6 of the sixth lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis may satisfy: 1.2 < SL/(CT3+ CT4+ CT5+ CT6+ CT7) < 1.7.

Another aspect of the present application provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a first lens having an optical power; a second lens having a positive optical power; a third lens having a positive optical power; a fourth lens having a negative optical power; a fifth lens having a positive optical power; a sixth lens having optical power; and a seventh lens having optical power. At least four lenses of the first lens to the fifth lens are made of plastic materials; the sixth lens is a spherical lens made of glass; and a combined focal length f67 of the sixth lens and the seventh lens, a radius of curvature R11 of an object-side surface of the sixth lens, and a radius of curvature R14 of an image-side surface of the seventh lens may satisfy: 1.0 < f67/(R11+ R14) < 4.5.

In one embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens satisfy: -3.6 < f1/f < -2.2.

In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f7 of the seventh lens may satisfy: f4/f7 is more than 0.4 and less than 1.7.

In one embodiment, the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens may satisfy: 0.2 < (f5+ f6)/f3 < 2.4.

In one embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens may satisfy: -0.7 < (R1+ R2)/(R3+ R4) < -0.3.

In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens may satisfy: 1.7 < R7/R8 < 2.8.

In one embodiment, the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R10 of the image-side surface of the fifth lens may satisfy: 0 < (R9+ R10)/(R9-R10) < 0.6.

In one embodiment, a distance T12 between the first lens and the second lens on the optical axis, a distance SAG11 on the optical axis from an intersection point of the object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens, and a distance SAG12 on the optical axis from an intersection point of the image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens may satisfy: 0.8 < T12/(SAG11+ SAG12) < 1.4.

In one embodiment, the central thickness CT2 of the second lens on the optical axis, the distance SAG21 on the optical axis from the intersection point of the object-side surface of the second lens and the optical axis to the effective radius vertex of the object-side surface of the second lens, and the distance SAG22 on the optical axis from the intersection point of the image-side surface of the second lens and the optical axis to the effective radius vertex of the image-side surface of the second lens may satisfy: 2.9 < CT2/(SAG21-SAG22) < 6.0.

In one embodiment, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, and the edge thickness ET7 of the seventh lens may satisfy: 0.5 < (ET4+ ET5)/(ET6+ ET7) < 1.3.

In one embodiment, the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens may satisfy: f/EPD < 1.2.

In one embodiment, a sum Σ CT of center thicknesses of the first to seventh lenses on the optical axis and a sum Σ AT of separation distances of any adjacent two lenses of the first to seventh lenses on the optical axis may satisfy: 2.6 < ∑ CT/Σ AT < 4.2.

In one embodiment, the optical imaging lens further includes a stop, and the distance SL on the optical axis from the stop to the imaging surface of the optical imaging lens, the central thickness CT3 on the optical axis of the third lens, the central thickness CT4 on the optical axis of the fourth lens, the central thickness CT5 on the optical axis of the fifth lens, the central thickness CT6 on the optical axis of the sixth lens, and the central thickness CT7 on the optical axis of the seventh lens may satisfy: 1.2 < SL/(CT3+ CT4+ CT5+ CT6+ CT7) < 1.7.

This application adopts seven lens, through material, focal power, face type, the center thickness of each lens of rational distribution and the epaxial interval between each lens etc for above-mentioned optical imaging lens has at least one beneficial effect such as big light ring, high definition, low cost and high imaging quality.

Drawings

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

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

fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 1;

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

fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 2;

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

fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 3;

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

fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 4;

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

fig. 10A to 10D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 5.

Detailed Description

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

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

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

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

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

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

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

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

An optical imaging lens according to an exemplary embodiment of the present application may include seven lenses having optical powers, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, respectively. The seven lenses are arranged along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the seventh lens may have a spacing distance therebetween.

In an exemplary embodiment, the first lens may have a positive power or a negative power; the second lens may have a positive optical power; the third lens may have a positive optical power; the fourth lens may have a negative optical power; the fifth lens may have a positive optical power; the sixth lens may have a positive optical power or a negative optical power; and the seventh lens may have a positive power or a negative power. Through the reasonable arrangement of the focal powers of the first lens to the seventh lens, the focal powers of the lenses are favorably and reasonably distributed, so that the sensitivity of the lenses is reduced as much as possible, and the production yield of the lens is improved.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: f/EPD < 1.2, where f is the total effective focal length of the optical imaging lens and EPD is the entrance pupil diameter of the optical imaging lens. More specifically, f and EPD may further satisfy: f/EPD < 1.1. The f/EPD is less than 1.2, which is beneficial to the lens to have the characteristics of large aperture and the like.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -3.6 < f1/f < -2.2, wherein f1 is the effective focal length of the first lens and f is the total effective focal length of the optical imaging lens. More specifically, f1 and f further satisfy: -3.6 < f1/f < -2.3. Satisfying-3.6 < f1/f < -2.2, being beneficial to reasonably distributing the focal power of each lens, not only avoiding the problems of sensitivity increase, yield reduction and the like caused by the excessive concentration of the focal power on the first lens, but also avoiding a series of problems of sensitivity increase and the like caused by the excessive concentration of the focal power on the rear lenses.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.4 < f4/f7 < 1.7, wherein f4 is the effective focal length of the fourth lens and f7 is the effective focal length of the seventh lens. Satisfying 0.4 < f4/f7 < 1.7 is beneficial to reasonably distributing the focal power of the fourth lens and the seventh lens. Meanwhile, f1/f is more than-3.6 and less than-2.2, which is beneficial to reducing the sensitivity of the lens, especially the temperature sensitivity of the lens and the like.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.2 < (f5+ f6)/f3 < 2.4, wherein f3 is the effective focal length of the third lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. Satisfy 0.2 < (f5+ f6)/f3 < 2.4, be favorable to improving the sensitivity of each lens, promote the lens yield.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -0.7 < (R1+ R2)/(R3+ R4) < -0.3, wherein R1 is the radius of curvature of the object-side surface of the first lens, R2 is the radius of curvature of the image-side surface of the first lens, R3 is the radius of curvature of the object-side surface of the second lens, and R4 is the radius of curvature of the image-side surface of the second lens. Satisfy-0.7 < (R1+ R2)/(R3+ R4) < -0.3, both can guarantee that first lens and second lens have reasonable focal power to avoid producing the problem that the lens image quality is too poor, can improve the first lens and second lens's preparation manufacturability.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.7 < R7/R8 < 2.8, wherein R7 is the radius of curvature of the object-side surface of the fourth lens and R8 is the radius of curvature of the image-side surface of the fourth lens. More specifically, R7 and R8 may further satisfy: 1.8 < R7/R8 < 2.8. The requirement that R7/R8 is more than 1.7 and less than 2.8 is met, the fourth lens has certain focal power, and meanwhile, the fourth lens has better manufacturability, so that the subsequent processing and assembly of the lens are facilitated.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0 < (R9+ R10)/(R9-R10) < 0.6, wherein R9 is a radius of curvature of an object-side surface of the fifth lens, and R10 is a radius of curvature of an image-side surface of the fifth lens. More specifically, R9 and R10 may further satisfy: 0.1 < (R9+ R10)/(R9-R10) < 0.5. Satisfy 0 < (R9+ R10)/(R9-R10) < 0.6, can guarantee the manufacturability of the fifth lens and reduce the sensitivity of the fifth lens while guaranteeing that the fifth lens has convergence ability to the light.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.0 < f67/(R11+ R14) < 4.5, where f67 is a combined focal length of the sixth lens and the seventh lens, R11 is a radius of curvature of an object-side surface of the sixth lens, and R14 is a radius of curvature of an image-side surface of the seventh lens. The requirement that f67/(R11+ R14) is more than 1.0 and less than 4.5 is met, so that the reasonable distribution of the focal power of the sixth lens and the seventh lens is facilitated, and the sensitivity of the whole lens is reduced.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.8 < T12/(SAG11+ SAG12) < 1.4, wherein T12 is a distance between the first lens and the second lens on the optical axis, SAG11 is a distance between an intersection point of the object side surface of the first lens and the optical axis and an effective radius vertex of the object side surface of the first lens on the optical axis, and SAG12 is a distance between an intersection point of the image side surface of the first lens and the optical axis and an effective radius vertex of the image side surface of the first lens on the optical axis. More specifically, T12, SAG11, and SAG12 may further satisfy: 0.8 < T12/(SAG11+ SAG12) < 1.3. The requirements of 0.8 < T12/(SAG11+ SAG12) < 1.4 are met, so that the lens has better image quality, and the overall manufacturability of the first lens can be improved as much as possible, thereby being beneficial to the mass production process of the subsequent lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 2.9 < CT2/(SAG21-SAG22) < 6.0, wherein CT2 is the central thickness of the second lens on the optical axis, SAG21 is the distance on the optical axis from the intersection point of the object side surface of the second lens and the optical axis to the effective radius vertex of the object side surface of the second lens, and SAG22 is the distance on the optical axis from the intersection point of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens. The requirements of 2.9 < CT2/(SAG21-SAG22) < 6.0 are met, the image quality of the lens can be improved, and meanwhile, the integral manufacturability of the second lens is favorably ensured.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.5 < (ET4+ ET5)/(ET6+ ET7) < 1.3, wherein ET4 is the edge thickness of the fourth lens, ET5 is the edge thickness of the fifth lens, ET6 is the edge thickness of the sixth lens, and ET7 is the edge thickness of the seventh lens. More specifically, ET4, ET5, ET6 and ET7 may further satisfy: 0.7 < (ET4+ ET5)/(ET6+ ET7) < 1.3. Satisfy 0.5 < (ET4+ ET5)/(ET6+ ET7) < 1.3, not only be favorable to improving the relative illuminance of the marginal field of view of the lens while improving the image quality of the lens, but also be favorable to reducing the sensitivity of the rear four lenses (fourth lens to seventh lens), still be favorable to guaranteeing that the rear four lenses have better manufacturability, in order to be favorable to the subsequent processing of lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: and 2.0 < TTL/f < 4.0, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis, and f is the total effective focal length of the optical imaging lens. More specifically, TTL and f further may satisfy: TTL/f is more than 3.5 and less than 3.9. The requirements that TTL/f is more than 2.0 and less than 4.0 are met, the total length TTL of the lens is favorably shortened, and the problems that the comprehensive performance of the lens is too poor and the like due to the fact that the ratio TTL/f is too small are favorably avoided.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 2.6 < ∑ CT/∑ AT < 4.2, where Σ CT is a sum of central thicknesses of the first lens to the seventh lens on the optical axis, and Σ AT is a sum of separation distances of any adjacent two lenses of the first lens to the seventh lens on the optical axis. More specifically, Σ CT and Σ AT further can satisfy: 2.8 < ∑ CT/Σ AT < 4.1. Satisfy 2.6 < ∑ CT/Σ AT < 4.2, be favorable to guaranteeing that optical imaging lens has better image quality, can also avoid the whole size of camera lens too big, and then be favorable to maintaining the miniaturized characteristics of camera lens.

In an exemplary embodiment, an optical imaging lens according to the present application further includes a stop disposed between the second lens and the third lens. In particular, the optical imaging lens according to the present application may satisfy: 1.2 < SL/(CT3+ CT4+ CT5+ CT6+ CT7) < 1.7, where SL is a distance on the optical axis from the diaphragm to the imaging surface of the optical imaging lens, CT3 is a center thickness of the third lens on the optical axis, CT4 is a center thickness of the fourth lens on the optical axis, CT5 is a center thickness of the fifth lens on the optical axis, CT6 is a center thickness of the sixth lens on the optical axis, and CT7 is a center thickness of the seventh lens on the optical axis. More specifically, SL, CT3, CT4, CT5, CT6, and CT7 may further satisfy: 1.3 < SL/(CT3+ CT4+ CT5+ CT6+ CT7) < 1.6. The requirements that SL/(CT3+ CT4+ CT5+ CT6+ CT7) < 1.2 are met, the overall performance of the lens can be improved, the problem that the overall size of the lens is increased due to the fact that the rear five lenses (the third lens to the seventh lens) are too thick can be solved, and meanwhile the problem that the manufacturability is reduced due to the fact that the rear five lenses are too thin can be solved.

In an exemplary embodiment, at least four lenses of the first to fifth lenses may be lenses of a plastic material. The lens made of plastic materials is beneficial to reducing the manufacturing cost of the lens. In an exemplary embodiment, the sixth lens may be a spherical lens made of glass, that is, the sixth lens may be a lens made of glass, and both the object-side surface and the image-side surface of the sixth lens may be aspheric. The arrangement of the sixth lens is beneficial to improving the imaging quality of the lens. The application provides an optical imaging lens is through adopting plastic lens and glass lens to mix the collocation, can improve the imaging quality of camera lens on reduction in production cost's basis, realizes high definition formation of image.

In an exemplary embodiment, an optical imaging lens according to the present application may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging surface. The application provides an optical imaging lens with characteristics of large aperture, low cost, large target surface, high imaging quality and the like. The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above seven lenses. By reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, incident light can be effectively converged, the optical total length of the imaging lens is reduced, the machinability of the imaging lens is improved, and the optical imaging lens is more beneficial to production and processing.

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

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

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

Example 1

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

As shown in fig. 1, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

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 concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

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

TABLE 1

In the present example, the total effective focal length f of the optical imaging lens is 8.61mm, the total length TTL of the optical imaging lens (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens) is 30.99mm, the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging lens is 4.55mm, and the maximum field angle FOV of the optical imaging lens is 64.1 °.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 to the fifth lens E5 and the seventh lens E7 are aspheric, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the coefficients A of the high-order terms which can be used for the aspherical mirror surfaces S1 to S10, S13 and S14 in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

TABLE 2

Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 1. Fig. 2C shows a distortion curve of the optical imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the optical imaging lens according to embodiment 1 can achieve good imaging quality.

Example 2

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

As shown in fig. 3, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

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 concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the optical imaging lens is 8.57mm, the total length TTL of the optical imaging lens is 31.00mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the optical imaging lens is 4.70mm, and the maximum field angle FOV of the optical imaging lens is 66.9 °.

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

TABLE 3

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-8.0101E-04

-4.0083E-05

-5.4368E-07

1.1431E-07

-3.4826E-09

4.2332E-11

2.9842E-14

-3.6731E-15

0.0000E+00

S2

-4.3555E-04

-1.0413E-04

7.8312E-07

1.8429E-07

-6.0260E-09

-1.3517E-11

2.7489E-12

0.0000E+00

0.0000E+00

S3

5.0874E-04

-2.9148E-05

-2.9529E-06

2.5356E-07

-1.5975E-08

4.0552E-10

-1.3888E-12

-1.2970E-14

0.0000E+00

S4

1.6988E-03

-1.3506E-04

7.2775E-06

-2.7970E-07

6.3225E-09

-5.2863E-11

-3.6349E-13

1.5454E-14

-2.5082E-16

S5

1.7980E-03

-2.3073E-04

1.5290E-05

-7.4818E-07

2.4830E-08

-4.6037E-10

3.5251E-12

0.0000E+00

0.0000E+00

S6

6.2051E-04

-7.3071E-05

4.8700E-06

-3.0195E-07

1.2095E-08

-2.4658E-10

1.9644E-12

0.0000E+00

0.0000E+00

S7

-3.2244E-03

1.4213E-04

-1.3263E-06

-3.4023E-07

2.3376E-08

-7.0679E-10

1.0597E-11

-6.4211E-14

0.0000E+00

S8

-5.4617E-03

3.3126E-04

-1.5143E-05

4.9114E-07

-1.2111E-08

2.3763E-10

-3.0998E-12

1.8084E-14

0.0000E+00

S9

-2.9621E-04

-1.4627E-05

4.7528E-06

-3.1743E-07

9.5336E-09

-1.2764E-10

4.9926E-13

1.8057E-15

0.0000E+00

S10

7.6085E-04

-5.3113E-06

3.9635E-07

-1.6451E-08

3.7523E-10

-2.8915E-12

-1.2554E-14

2.2279E-16

0.0000E+00

S13

-9.7923E-04

5.8732E-05

-2.8234E-06

1.1049E-07

-2.6450E-09

3.1937E-11

-1.4103E-13

0.0000E+00

0.0000E+00

S14

-2.2646E-03

1.1073E-04

-2.3735E-06

-9.4749E-08

1.3108E-08

-4.0683E-10

1.2493E-12

1.1336E-13

0.0000E+00

TABLE 4

Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 2. Fig. 4C shows a distortion curve of the optical imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, the optical imaging lens according to embodiment 2 can achieve good imaging quality.

Example 3

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

As shown in fig. 5, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

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 concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the optical imaging lens is 8.68mm, the total length TTL of the optical imaging lens is 31.00mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the optical imaging lens is 4.55mm, and the maximum field angle FOV of the optical imaging lens is 63.0 °.

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

Flour mark	Surface type	Radius of curvature	Thickness/distance	Refractive index	Abbe number	Material of	Focal length	Coefficient of cone
									OBJ	Spherical surface	All-round	All-round
S1	Aspherical surface	5.1547	1.7000	1.55	56.1	Plastic material	-24.77	-0.9944
									S2	Aspherical surface	3.2973	4.7677					-0.9845
S3	Aspherical surface	-10.9781	3.2491	1.57	37.3	Plastic material	26.18	0.3467
									S4	Aspherical surface	-7.0071	0.0599					-0.0007
STO	Spherical surface	All-round	0.5833
									S5	Aspherical surface	48.1656	3.0500	1.53	55.5	Glass	42.08	0.4111
S6	Aspherical surface	-41.3782	0.0300					38.9948
									S7	Aspherical surface	9.6685	1.9000	1.66	20.4	Plastic material	-17.07	0.1937
S8	Aspherical surface	4.8178	0.8081					-0.8895
									S9	Aspherical surface	17.2385	4.1385	1.55	56.1	Plastic material	10.52	-0.1157
S10	Aspherical surface	-7.8831	0.0600					0.0003
									S11	Spherical surface	11.8370	3.5010	1.74	44.9	Glass	12.83
S12	Spherical surface	-43.9571	0.0300
									S13	Aspherical surface	36.5496	1.6000	1.67	19.2	Plastic material	-11.90	0.0000
S14	Aspherical surface	6.4907	1.4673					0.0000
									S15	Spherical surface	All-round	0.7000	1.52	64.2	Glass
S16	Spherical surface	All-round	3.3552
									S17	Spherical surface	All-round

TABLE 5

TABLE 6

Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 6C shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the optical imaging lens according to embodiment 3 can achieve good imaging quality.

Example 4

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

As shown in fig. 7, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

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 concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the optical imaging lens is 8.41mm, the total length TTL of the optical imaging lens is 31.00mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the optical imaging lens is 4.21mm, and the maximum field angle FOV of the optical imaging lens is 57.8 °.

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

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-5.6889E-04

-1.4141E-05

-8.4432E-07

6.1166E-08

-1.3202E-09

1.1944E-11

3.8922E-15

-5.4098E-16

0.0000E+00

S2

-2.2903E-04

-6.2647E-05

3.8438E-06

-4.1939E-07

2.8712E-08

-9.1987E-10

1.1593E-11

0.0000E+00

0.0000E+00

S3

1.6050E-05

3.8858E-06

-2.2062E-06

3.8802E-08

-1.1680E-09

7.1747E-11

-3.6863E-12

8.8652E-14

0.0000E+00

S4

1.1484E-03

-4.5102E-05

1.4311E-06

-5.0907E-08

7.7757E-10

6.5921E-11

-4.2679E-12

1.1758E-13

-1.7092E-15

S5

9.3712E-04

-8.0882E-05

3.3767E-06

-1.5441E-07

6.1741E-09

-1.3077E-10

1.0482E-12

0.0000E+00

0.0000E+00

S6

5.6313E-04

8.2692E-07

-4.8206E-06

2.4558E-07

-4.4939E-09

2.0450E-11

1.5883E-13

0.0000E+00

0.0000E+00

S7

-3.0635E-03

1.6110E-04

-6.4001E-06

2.9822E-08

8.5549E-09

-3.4380E-10

5.4893E-12

-3.2574E-14

0.0000E+00

S8

-5.6444E-03

3.4570E-04

-1.6645E-05

5.9565E-07

-1.6591E-08

3.4941E-10

-4.5775E-12

2.6262E-14

0.0000E+00

S9

2.7076E-04

-4.2067E-05

4.7861E-06

-2.8556E-07

8.6098E-09

-1.1772E-10

4.7399E-13

1.6412E-15

0.0000E+00

S10

1.1996E-03

-2.7322E-05

8.5899E-07

-2.9068E-08

9.7938E-10

-1.5201E-11

4.2387E-14

6.3761E-16

0.0000E+00

S13

6.5285E-04

-9.5233E-05

6.8784E-06

-2.5070E-07

4.9084E-09

-5.2092E-11

2.8194E-13

0.0000E+00

0.0000E+00

S14

-1.1576E-04

-3.0949E-05

9.8102E-06

-7.4577E-07

4.6500E-08

-8.1675E-10

-6.2553E-11

2.5578E-12

0.0000E+00

TABLE 8

Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 4. Fig. 8C shows a distortion curve of the optical imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 8A to 8D, the optical imaging lens according to embodiment 4 can achieve good imaging quality.

Example 5

An optical imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic structural diagram of an optical imaging lens according to embodiment 5 of the present application.

As shown in fig. 9, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

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 concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the optical imaging lens is 8.54mm, the total length TTL of the optical imaging lens is 32.49mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the optical imaging lens is 5.00mm, and the maximum field angle FOV of the optical imaging lens is 70.4 °.

Table 9 shows a basic parameter table of the optical imaging lens of embodiment 5, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 10 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Watch 10

Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 5. Fig. 10C shows a distortion curve of the optical imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 10A to 10D, the optical imaging lens according to embodiment 5 can achieve good imaging quality.

In summary, examples 1 to 5 satisfy the relationships shown in table 11, respectively.

Conditions/examples	1	2	3	4	5
						f/EPD	0.96	1.05	1.05	0.94	0.95
TTL/f	3.60	3.62	3.57	3.68	3.80
						f1/f	-2.90	-2.85	-2.85	-3.47	-3.00
f4/f7	1.38	1.32	1.43	1.49	1.54
						(f5+f6)/f3	0.47	0.43	0.55	0.52	0.36
(R1+R2)/(R3+R4)	-0.46	-0.45	-0.47	-0.52	-0.50
						R7/R8	1.99	2.02	2.01	2.01	1.91
(R9+R10)/(R9-R10)	0.40	0.40	0.37	0.45	0.39
						∑CT/∑AT	3.27	3.08	3.02	2.85	3.15
SL/(CT3+CT4+CT5+CT6+CT7)	1.50	1.55	1.50	1.40	1.50
						f67/(R11+R14)	2.67	2.26	4.36	3.52	2.25
T12/(SAG11+SAG12)	0.97	0.97	1.11	1.21	0.95
						CT2/(SAG21-SAG22)	4.84	3.68	3.60	3.40	3.03
(ET4+ET5)/(ET6+ET7)	1.05	0.96	0.99	0.82	0.76

TABLE 11

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

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

Claims (27)

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

a first lens having an optical power;

a second lens having a positive optical power;

a third lens having a positive optical power;

a fourth lens having a negative optical power;

a fifth lens having a positive optical power;

a sixth lens having optical power; and

a seventh lens having optical power;

at least four lenses of the first lens to the fifth lens are plastic lenses;

the sixth lens is a spherical lens made of glass; and

the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and the total effective focal length f of the optical imaging lens meet the following requirements: TTL/f is more than 2.0 and less than 4.0.

2. The optical imaging lens of claim 1, wherein the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens satisfy: -3.6 < f1/f < -2.2.

3. The optical imaging lens of claim 1, wherein the effective focal length f4 of the fourth lens and the effective focal length f7 of the seventh lens satisfy: f4/f7 is more than 0.4 and less than 1.7.

4. The optical imaging lens of claim 1, wherein the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: 0.2 < (f5+ f6)/f3 < 2.4.

5. The optical imaging lens of claim 1, wherein the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens satisfy: -0.7 < (R1+ R2)/(R3+ R4) < -0.3.

6. The optical imaging lens of claim 1, wherein the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: 1.7 < R7/R8 < 2.8.

7. The optical imaging lens of claim 1, wherein the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R10 of the image-side surface of the fifth lens satisfy: 0 < (R9+ R10)/(R9-R10) < 0.6.

8. The optical imaging lens of claim 1, wherein a combined focal length f67 of the sixth lens and the seventh lens, a radius of curvature R11 of an object-side surface of the sixth lens, and a radius of curvature R14 of an image-side surface of the seventh lens satisfy: 1.0 < f67/(R11+ R14) < 4.5.

9. The optical imaging lens according to claim 1, wherein a distance T12 between the first lens and the second lens on the optical axis, a distance SAG11 between an intersection point of the object side surface of the first lens and the optical axis and an effective radius vertex of the object side surface of the first lens on the optical axis, and a distance SAG12 between an intersection point of the image side surface of the first lens and the optical axis and an effective radius vertex of the image side surface of the first lens on the optical axis satisfy: 0.8 < T12/(SAG11+ SAG12) < 1.4.

10. The optical imaging lens according to claim 1, wherein a center thickness CT2 of the second lens on the optical axis, a distance SAG21 of an effective radius vertex of an object side surface of the second lens from an intersection of the object side surface of the second lens and the optical axis to the optical axis, and a distance SAG22 of an effective radius vertex of an image side surface of the second lens from an intersection of the image side surface of the second lens and the optical axis to the optical axis satisfy: 2.9 < CT2/(SAG21-SAG22) < 6.0.

11. The optical imaging lens according to claim 1, characterized in that the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens and the edge thickness ET7 of the seventh lens satisfy: 0.5 < (ET4+ ET5)/(ET6+ ET7) < 1.3.

12. The optical imaging lens of any one of claims 1-11 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 < 1.2.

13. The optical imaging lens according to any one of claims 1 to 11, wherein a sum Σ CT of central thicknesses of the first to seventh lenses on the optical axis and a sum Σ AT of separation distances of any adjacent two lenses of the first to seventh lenses on the optical axis satisfy: 2.6 < ∑ CT/Σ AT < 4.2.

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

a distance SL on the optical axis of an imaging surface of the optical imaging lens from the stop, a center thickness CT3 on the optical axis of the third lens, a center thickness CT4 on the optical axis of the fourth lens, a center thickness CT5 on the optical axis of the fifth lens, a center thickness CT6 on the optical axis of the sixth lens, and a center thickness CT7 on the optical axis of the seventh lens satisfy: 1.2 < SL/(CT3+ CT4+ CT5+ CT6+ CT7) < 1.7.

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

a first lens having an optical power;

a second lens having a positive optical power;

a third lens having a positive optical power;

a fourth lens having a negative optical power;

a fifth lens having a positive optical power;

a sixth lens having optical power; and

a seventh lens having optical power;

at least four lenses of the first lens to the fifth lens are plastic lenses;

the sixth lens is a spherical lens made of glass; and

a combined focal length f67 of the sixth lens and the seventh lens, a radius of curvature R11 of an object-side surface of the sixth lens, and a radius of curvature R14 of an image-side surface of the seventh lens satisfy: 1.0 < f67/(R11+ R14) < 4.5.

16. The optical imaging lens of claim 15, wherein the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens satisfy: -3.6 < f1/f < -2.2.

17. The optical imaging lens of claim 15, wherein the effective focal length f4 of the fourth lens and the effective focal length f7 of the seventh lens satisfy: f4/f7 is more than 0.4 and less than 1.7.

18. The optical imaging lens of claim 15, wherein the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: 0.2 < (f5+ f6)/f3 < 2.4.

19. The optical imaging lens of claim 15, wherein the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens satisfy: -0.7 < (R1+ R2)/(R3+ R4) < -0.3.

20. The optical imaging lens of claim 15, wherein the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy: 1.7 < R7/R8 < 2.8.

21. The optical imaging lens of claim 15, wherein the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R10 of the image-side surface of the fifth lens satisfy: 0 < (R9+ R10)/(R9-R10) < 0.6.

22. The optical imaging lens of claim 15, wherein a distance T12 between the first lens and the second lens on the optical axis, a distance SAG11 between an intersection point of the object side surface of the first lens and the optical axis and an effective radius vertex of the object side surface of the first lens on the optical axis, and a distance SAG12 between an intersection point of the image side surface of the first lens and the optical axis and an effective radius vertex of the image side surface of the first lens on the optical axis satisfy: 0.8 < T12/(SAG11+ SAG12) < 1.4.

23. The optical imaging lens of claim 15, wherein the central thickness CT2 of the second lens on the optical axis, the distance SAG21 of the effective radius vertex of the object side surface of the second lens from the intersection of the object side surface of the second lens and the optical axis to the optical axis, and the distance SAG22 of the effective radius vertex of the image side surface of the second lens from the intersection of the image side surface of the second lens and the optical axis to the optical axis satisfy: 2.9 < CT2/(SAG21-SAG22) < 6.0.

24. The optical imaging lens according to claim 15, wherein the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens and the edge thickness ET7 of the seventh lens satisfy: 0.5 < (ET4+ ET5)/(ET6+ ET7) < 1.3.

25. The optical imaging lens of any one of claims 15-24 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 < 1.2.

26. The optical imaging lens according to any one of claims 15 to 24, wherein a sum Σ CT of central thicknesses of the first to seventh lenses on the optical axis and a sum Σ AT of separation distances of any adjacent two lenses of the first to seventh lenses on the optical axis satisfy: 2.6 < ∑ CT/Σ AT < 4.2.

27. The optical imaging lens of any one of claims 15 to 24, further comprising a diaphragm,

a distance SL on the optical axis of an imaging surface of the optical imaging lens from the stop, a center thickness CT3 on the optical axis of the third lens, a center thickness CT4 on the optical axis of the fourth lens, a center thickness CT5 on the optical axis of the fifth lens, a center thickness CT6 on the optical axis of the sixth lens, and a center thickness CT7 on the optical axis of the seventh lens satisfy: 1.2 < SL/(CT3+ CT4+ CT5+ CT6+ CT7) < 1.7.

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