CN214795385U - 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 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 a negative optical power. The third lens is a spherical lens made of glass; at least three lenses of the fourth lens to the seventh lens are plastic lenses; 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 entrance pupil diameter EPD of the optical imaging lens meet the following requirements: TTL/EPD is more than 3.0 and less than 5.0.

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 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 a negative optical power. The third lens is a spherical lens made of glass; at least three lenses of the fourth lens to the seventh lens are plastic lenses; 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 entrance pupil diameter EPD of the optical imaging lens can satisfy the following conditions: TTL/EPD is more than 3.0 and less than 5.0.

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, the radius of curvature R1 of the object-side surface of the first lens, and the radius of curvature R2 of the image-side surface of the first lens may satisfy: -2.0 < f1/(R1+ R2) < -1.2.

In one embodiment, the effective focal length f5 of the fifth lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens may satisfy: 1.0 < f5/(f3+ f4) < 2.1.

In one embodiment, the total effective focal length f of the optical imaging lens, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens may satisfy: -1.4 < f/(f6+ f7) < -0.7.

In one embodiment, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens may satisfy: 0.9 < (R5+ R6)/(R3+ R4) < 2.7.

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: 1.5 < (R7+ R8)/(R7-R8) < 2.2.

In one embodiment, a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T34 on the optical axis of the third lens and the fourth lens, and a separation distance T56 on the optical axis of the fifth lens and the sixth lens may satisfy: 0.8 < T12/(T34+ T56) < 1.5.

In one embodiment, the combined focal length f67 of the sixth and seventh lenses and the combined focal length f345 of the third, fourth, and fifth lenses may satisfy: f67/f345 is more than 1.2 and less than 1.8.

In one embodiment, a distance SAG42 on the optical axis from the intersection point of the image-side surface of the fourth lens and the optical axis to the effective radius vertex of the image-side surface of the fourth lens, a distance SAG51 on the optical axis from the intersection point of the object-side surface of the fifth lens and the optical axis to the effective radius vertex of the object-side surface of the fifth lens, and a distance SAG52 on the optical axis from the intersection point of the image-side surface of the fifth lens and the optical axis to the effective radius vertex of the image-side surface of the fifth lens may satisfy: 1.6 < SAG42/(SAG51+ SAG52) < 2.4.

In one embodiment, a distance SAG71 on the optical axis from the intersection point of the object-side surface of the seventh lens and the optical axis to the effective radius vertex of the object-side surface of the seventh lens and a distance SAG72 on the optical axis from the intersection point of the image-side surface of the seventh lens and the optical axis to the effective radius vertex of the image-side surface of the seventh lens may satisfy: 1.5 < SAG72/SAG71 < 2.7.

In one embodiment, the edge thickness ET1 of the first lens, the edge thickness ET3 of the third lens, and the edge thickness ET5 of the fifth lens may satisfy: 1.0 < ET1/(ET3+ ET5) < 1.5.

In one embodiment, the edge thickness ET4 of the fourth lens, the edge thickness ET6 of the sixth lens, and the edge thickness ET7 of the seventh lens may satisfy: 0.8 < ET4/(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, the optical imaging lens further includes a stop, and a distance SL from the stop to an imaging surface of the optical imaging lens on the optical axis and a distance TTL from an object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis may satisfy: TTL/SL is more than 1.6 and less than 2.1.

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 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 a negative optical power. The third lens is a spherical lens made of glass; at least three lenses of the fourth lens to the seventh lens are plastic lenses; and the effective focal length f1 of the first lens, the radius of curvature R1 of the object-side surface of the first lens, and the radius of curvature R2 of the image-side surface of the first lens may satisfy: -2.0 < f1/(R1+ R2) < -1.2.

In one embodiment, the effective focal length f5 of the fifth lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens may satisfy: 1.0 < f5/(f3+ f4) < 2.1.

In one embodiment, the total effective focal length f of the optical imaging lens, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens may satisfy: -1.4 < f/(f6+ f7) < -0.7.

In one embodiment, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens may satisfy: 0.9 < (R5+ R6)/(R3+ R4) < 2.7.

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: 1.5 < (R7+ R8)/(R7-R8) < 2.2.

In one embodiment, a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T34 on the optical axis of the third lens and the fourth lens, and a separation distance T56 on the optical axis of the fifth lens and the sixth lens may satisfy: 0.8 < T12/(T34+ T56) < 1.5.

In one embodiment, the combined focal length f67 of the sixth and seventh lenses and the combined focal length f345 of the third, fourth, and fifth lenses may satisfy: f67/f345 is more than 1.2 and less than 1.8.

In one embodiment, a distance SAG42 on the optical axis from the intersection point of the image-side surface of the fourth lens and the optical axis to the effective radius vertex of the image-side surface of the fourth lens, a distance SAG51 on the optical axis from the intersection point of the object-side surface of the fifth lens and the optical axis to the effective radius vertex of the object-side surface of the fifth lens, and a distance SAG52 on the optical axis from the intersection point of the image-side surface of the fifth lens and the optical axis to the effective radius vertex of the image-side surface of the fifth lens may satisfy: 1.6 < SAG42/(SAG51+ SAG52) < 2.4.

In one embodiment, a distance SAG71 on the optical axis from the intersection point of the object-side surface of the seventh lens and the optical axis to the effective radius vertex of the object-side surface of the seventh lens and a distance SAG72 on the optical axis from the intersection point of the image-side surface of the seventh lens and the optical axis to the effective radius vertex of the image-side surface of the seventh lens may satisfy: 1.5 < SAG72/SAG71 < 2.7.

In one embodiment, the edge thickness ET1 of the first lens, the edge thickness ET3 of the third lens, and the edge thickness ET5 of the fifth lens may satisfy: 1.0 < ET1/(ET3+ ET5) < 1.5.

In one embodiment, the edge thickness ET4 of the fourth lens, the edge thickness ET6 of the sixth lens, and the edge thickness ET7 of the seventh lens may satisfy: 0.8 < ET4/(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, the optical imaging lens further includes a stop, and a distance SL from the stop to an imaging surface of the optical imaging lens on the optical axis and a distance TTL from an object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis may satisfy: TTL/SL is more than 1.6 and less than 2.1.

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 system 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 or a negative 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 negative optical power. Through the reasonable arrangement of the focal power of the first lens to the seventh lens, the aberration correction capability of the lens can be improved, and the sensitivity of the lens can be reduced. In particular, the seventh lens element is set to have a negative power, which is advantageous for increasing the image height on the imaging plane, so that the lens barrel has a large image plane characteristic.

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 < 1.0. Satisfy f/EPD < 1.2, both can increase the light flux of camera lens effectively, improve the relative illuminance of camera lens, can promote the imaging quality of camera lens under darker environment well again, improve the practicality of camera lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -2.0 < f1/(R1+ R2) < -1.2, wherein f1 is the effective focal length of the first lens, R1 is the radius of curvature of the object-side surface of the first lens, and R2 is the radius of curvature of the image-side surface of the first lens. More specifically, f1, R1, and R2 may further satisfy: -2.0 < f1/(R1+ R2) < -1.4. Satisfies f1 (R1+ R2) of-2.0 and f1 (R1+ R2) of-1.2, and can make the lens have high aberration correction capability and good manufacturability.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.0 < f5/(f3+ f4) < 2.1, where f5 is the effective focal length of the fifth lens, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens. More specifically, f5, f3, and f4 may further satisfy: 1.1 < f5/(f3+ f4) < 2.1. The optical imaging lens meets the requirements that f5/(f3+ f4) < 2.1 is more than 1.0, the focal power of each lens can be more reasonably distributed, the focal power is prevented from being excessively concentrated on the fifth lens, the imaging quality of the lens is improved, the sensitivity of the lens is reduced, and the optical imaging lens has a good imaging effect at high and low temperatures.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -1.4 < f/(f6+ f7) < -0.7, wherein f is the total effective focal length of the optical imaging lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. Satisfy-1.4 < f/(f6+ f7) < -0.7, can effectively reduce the aberration of the whole lens, reduce the sensitivity of the lens, simultaneously can avoid the inclination of the object side surfaces of the sixth lens and the seventh lens from being too large by controlling the focal power of the sixth lens and the seventh lens, and ensure that the sixth lens and the seventh lens have better processing manufacturability.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.9 < (R5+ R6)/(R3+ R4) < 2.7, wherein R3 is a radius of curvature of an object-side surface of the second lens, R4 is a radius of curvature of an image-side surface of the second lens, R5 is a radius of curvature of an object-side surface of the third lens, and R6 is a radius of curvature of an image-side surface of the third lens. More specifically, R5, R6, R3 and R4 may further satisfy: 1.0 < (R5+ R6)/(R3+ R4) < 2.6. Satisfy 0.9 < (R5+ R6)/(R3+ R4) < 2.7, can also avoid the camera lens that the aperture is too big causes and image quality is relatively poor and sensitivity is higher scheduling problem when guaranteeing that second lens and third lens have good processibility.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.5 < (R7+ R8)/(R7-R8) < 2.2, 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: 1.6 < (R7+ R8)/(R7-R8) < 2.2. Satisfy 1.5 < (R7+ R8)/(R7-R8) < 2.2, can avoid the problem such as the processing technology difficulty that causes because the fourth lens is too thin, through the structure size of rationally adjusting the fourth lens, be favorable to reducing the camera lens size, keep the good machinability of camera lens, can also reduce the distortion influence volume of camera lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.8 < T12/(T34+ T56) < 1.5, where T12 is a distance of separation of the first lens and the second lens on the optical axis, T34 is a distance of separation of the third lens and the fourth lens on the optical axis, and T56 is a distance of separation of the fifth lens and the sixth lens on the optical axis. More specifically, T12, T34, and T56 may further satisfy: 0.9 < T12/(T34+ T56) < 1.4. The requirement that T12/(T34+ T56) is more than 0.8 and less than 1.5 is met, so that the method is not only beneficial to debugging the gap sensitivity among the lenses, but also beneficial to avoiding the problem of overlong total length of the lens caused by overlarge gap among the lenses.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.2 < f67/f345 < 1.8, where f67 is the combined focal length of the sixth lens and the seventh lens, and f345 is the combined focal length of the third lens, the fourth lens, and the fifth lens. Satisfying 1.2 < f67/f345 < 1.8, not only being beneficial to reasonably distributing the focal power of each lens, avoiding the focal power from being excessively concentrated on the first lenses (such as the first lens to the fourth lens), but also being beneficial to debugging the temperature sensitivity of the lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.6 < SAG42/(SAG51+ SAG52) < 2.4, wherein SAG42 is a distance on the optical axis from the intersection point of the image-side surface of the fourth lens and the optical axis to the effective radius vertex of the image-side surface of the fourth lens, SAG51 is a distance on the optical axis from the intersection point of the object-side surface of the fifth lens and the optical axis to the effective radius vertex of the object-side surface of the fifth lens, and SAG52 is a distance on the optical axis from the intersection point of the image-side surface of the fifth lens and the optical axis to the effective radius vertex of the image-side surface of the fifth lens. More specifically, SAG42, SAG51, and SAG52 may further satisfy: 1.7 < SAG42/(SAG51+ SAG52) < 2.4. The requirements of 1.6 < SAG42/(SAG51+ SAG52) < 2.4 are met, the sensitivity of the fourth lens and the sensitivity of the fifth lens are reduced, the manufacturability of the fourth lens and the fifth lens is improved, and the possibility of mass production of the optical imaging lens is realized.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.5 < SAG72/SAG71 < 2.7, wherein SAG71 is a distance on the optical axis from the intersection point of the object side surface of the seventh lens and the optical axis to the effective radius vertex of the object side surface of the seventh lens, and SAG72 is a distance on the optical axis from the intersection point of the image side surface of the seventh lens and the optical axis to the effective radius vertex of the image side surface of the seventh lens. More specifically, SAG72 and SAG71 further may satisfy: 1.6 < SAG72/SAG71 < 2.6. The requirement that SAG72/SAG71 is more than 1.5 and less than 2.7 is met, and the manufacturability of the seventh lens is improved as much as possible on the premise of ensuring the basic performance of the lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.0 < ET1/(ET3+ ET5) < 1.5, wherein ET1 is the edge thickness of the first lens, ET3 is the edge thickness of the third lens, and ET5 is the edge thickness of the fifth lens. More specifically, ET1, ET3, and ET5 may further satisfy: 1.0 < ET1/(ET3+ ET5) < 1.4. The requirements that ET1/(ET3+ ET5) < 1.0 are met, the chromatic aberration generated by the whole lens can be better balanced by the first lens, the third lens and the fifth lens, the distortion of the lens is effectively controlled, the difficulty in the processing process caused by the fact that the fifth lens is too thin can be effectively avoided, the sensitivity of the lens can be reduced, and the yield of the whole lens is improved.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.8 < ET4/(ET6+ ET7) < 1.3, wherein ET4 is the edge thickness of the fourth lens, ET6 is the edge thickness of the sixth lens, and ET7 is the edge thickness of the seventh lens. More specifically, ET4, ET6, and ET7 may further satisfy: 0.9 < ET4/(ET6+ ET7) < 1.3. The requirements that ET4/(ET6+ ET7) is more than 0.8 and less than 1.3 are met, so that the illuminance of the edge is favorably improved, and the reasonable processing manufacturability of the fourth lens, the sixth lens and the seventh lens is favorably ensured.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: and the TTL/EPD is less than 5.0, wherein the 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 the EPD is the entrance pupil diameter of the optical imaging lens. More specifically, TTL and EPD may further satisfy: TTL/EPD is more than 3.5 and less than 4.2. The lens meets the requirements that TTL/EPD is more than 3.0 and less than 5.0, the total length TTL of the lens is favorably controlled within a proper range, and the problems that the light passing amount of the lens is insufficient and the like due to the fact that the diameter EPD of the entrance pupil is too small are avoided.

In an exemplary embodiment, an optical imaging lens according to the present application further includes a stop disposed between the third lens and the fourth lens. In particular, the optical imaging lens according to the present application may satisfy: 1.6 < TTL/SL < 2.1, wherein SL is the distance between the diaphragm and the imaging surface of the optical imaging lens on the optical axis, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis. More specifically, TTL and SL may further satisfy: TTL/SL is more than 1.7 and less than 2.0. The requirements that TTL/SL is more than 1.6 and less than 2.1 are met, the central thickness and the spacing distance of each lens in the lens can be reasonably distributed, the integral chromatic aberration and distortion of the lens can be effectively balanced while the optical imaging lens ensures good performance, and the difficulty in the aspect of processing technology caused by the fact that each lens is too thin can be avoided.

In an exemplary embodiment, the third lens may be a spherical lens made of glass, that is, the third lens may be a lens made of glass, and both the object-side surface and the image-side surface of the third lens may be spherical mirror surfaces. In the exemplary embodiment, at least three lenses of the fourth lens to the seventh lens are made of plastic. This application adopts the manufacturing cost of plastics material's lens to be favorable to reducing the camera lens. Particularly, the optical imaging lens provided by the application can improve the imaging quality of the lens and realize high-definition imaging on the basis of reducing the production cost by adopting the plastic lens and the glass lens to be mixed and matched.

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 lens, the second lens, and the fourth to seventh lenses is an aspherical mirror surface, that is, at least one of the object-side and image-side surfaces of the first lens and the second lens and the object-side and image-side surfaces of the fourth to seventh lenses 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 fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspherical mirror surface. Optionally, each of the first, second, fourth, fifth, sixth, 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 third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface 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).

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	7.5332	2.0000	1.55	56.1	Plastic material	-17.71	0.0000
									S2	Aspherical surface	3.8374	4.0973					-1.0000
S3	Aspherical surface	-8.2206	3.5000	1.64	23.5	Plastic material	42.10	0.0000
									S4	Aspherical surface	-7.3582	0.0300					0.0000
S5	Spherical surface	13.1354	3.6364	1.69	54.6	Glass	15.49
									S6	Spherical surface	-52.6550	0.5668
STO	Spherical surface	All-round	0.6742
									S7	Aspherical surface	13.2894	1.5000	1.66	20.4	Plastic material	-8.86	0.0000
S8	Aspherical surface	3.9017	0.3341					-1.0000
									S9	Aspherical surface	6.6196	3.8001	1.54	55.7	Plastic material	9.22	0.0000
S10	Aspherical surface	-15.6738	2.3089					0.0000
									S11	Aspherical surface	26.8382	2.8036	1.55	56.1	Plastic material	11.45	0.0000
S12	Aspherical surface	-7.8451	0.0300					0.0000
									S13	Aspherical surface	5.1095	1.1728	1.66	20.4	Plastic material	-18.39	0.0000
S14	Aspherical surface	3.2744	1.0057					-1.6775
									S15	Spherical surface	All-round	0.7000	1.52	64.2	Glass
S16	Spherical surface	All-round	2.8400
									S17	Spherical surface	All-round

TABLE 1

In the present example, the total effective focal length f of the optical imaging lens is 8.17mm, 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 31.00mm, 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 66.3 °.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1, the second lens E2, the fourth lens E4 to the seventh lens E7 are aspheric, and the surface type 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 S4, S7 to 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 third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface 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 8.09mm, the total length TTL of the optical imaging lens is 32.58mm, 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 65.8 °.

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

TABLE 3

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.5811E-03

3.0398E-06

-1.6441E-06

2.2407E-07

-1.3741E-08

4.8338E-10

-1.0032E-11

1.1404E-13

-5.4938E-16

S2

-1.3527E-03

-1.8296E-05

1.7162E-06

2.2025E-08

-1.1365E-08

1.0841E-09

-5.9746E-11

1.9875E-12

-3.6800E-14

S3

5.7306E-04

-5.5992E-06

-1.2174E-06

1.2870E-07

-1.1291E-08

5.9798E-10

-1.8756E-11

3.1120E-13

-2.6208E-15

S4

5.1155E-04

5.2210E-07

-6.9862E-07

6.5456E-08

-4.0184E-09

1.4603E-10

-2.5619E-12

-2.0907E-16

6.8862E-16

S7

-3.0533E-03

2.3651E-04

-1.9755E-05

1.2371E-06

-5.5279E-08

1.7121E-09

-3.4773E-11

4.1543E-13

-2.2080E-15

S8

-7.0160E-03

6.7251E-04

-5.8838E-05

4.1336E-06

-2.2538E-07

8.6275E-09

-1.9964E-10

2.0623E-12

8.7712E-15

S9

-3.2145E-03

2.4154E-04

-1.2061E-05

3.7366E-07

-2.2500E-08

1.4359E-09

-3.9109E-11

-2.6229E-14

2.3658E-14

S10

9.9724E-04

-4.5384E-05

4.6115E-06

-5.6758E-07

4.5763E-08

-2.2982E-09

6.9812E-11

-1.1795E-12

8.4808E-15

S11

3.2475E-03

-2.2521E-04

2.5559E-05

-2.7036E-06

2.1399E-07

-1.1398E-08

3.7700E-10

-6.5772E-12

2.9460E-14

S12

5.3619E-03

-3.0496E-04

6.4774E-06

1.6445E-06

-2.3144E-07

1.5098E-08

-5.4398E-10

1.0101E-11

-6.8916E-14

S13

-7.9010E-03

5.5107E-04

-7.7580E-05

7.0897E-06

-4.6993E-07

2.1762E-08

-6.9332E-10

1.4172E-11

-1.4670E-13

S14

-1.1920E-02

1.7516E-03

-2.5277E-04

2.7265E-05

-2.1189E-06

1.1425E-07

-4.0194E-09

8.2519E-11

-7.4627E-13

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 third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface 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 8.10mm, 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 66.0 °.

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	7.6327	2.0000	1.55	56.1	Plastic material	-17.19	0.0000
									S2	Aspherical surface	3.8202	3.9917					-1.0000
S3	Aspherical surface	-7.6822	3.2901	1.64	23.5	Plastic material	64.77	0.0000
									S4	Aspherical surface	-7.5742	0.0300					0.0000
S5	Spherical surface	13.8773	3.6065	1.69	54.6	Glass	14.17
									S6	Spherical surface	-30.2345	0.9005
STO	Spherical surface	All-round	0.8700
									S7	Aspherical surface	12.5836	1.5000	1.66	20.4	Plastic material	-9.12	0.0000
S8	Aspherical surface	3.8995	0.3322					-1.0000
									S9	Aspherical surface	6.4904	3.8387	1.54	55.7	Plastic material	8.91	0.0000
S10	Aspherical surface	-14.3863	1.9105					0.0000
									S11	Aspherical surface	60.8858	3.0684	1.53	55.5	Glass	11.84	0.0000
S12	Aspherical surface	-6.9528	0.0300					0.0000
									S13	Aspherical surface	4.8291	1.1400	1.66	20.4	Plastic material	-18.12	0.0000
S14	Aspherical surface	3.1232	1.0059					-1.6507
									S15	Spherical surface	All-round	0.7000	1.52	64.2	Glass
S16	Spherical surface	All-round	2.7855
									S17	Spherical surface	All-round

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.5430E-03

-7.2827E-06

2.0745E-07

4.3316E-08

-3.3318E-09

1.2507E-10

-2.7558E-12

3.3690E-14

-1.7649E-16

S2

-1.2625E-03

-1.8554E-05

9.6023E-07

1.3552E-07

-2.0889E-08

1.6163E-09

-8.0118E-11

2.5143E-12

-4.5160E-14

S3

6.9616E-04

-1.0621E-05

-9.9402E-07

1.1044E-07

-1.0168E-08

5.5086E-10

-1.6881E-11

2.2354E-13

4.3979E-17

S4

6.0120E-04

-1.8055E-06

-7.9588E-07

8.5573E-08

-5.6508E-09

2.1991E-10

-4.1961E-12

4.5697E-15

1.1406E-15

S7

-3.0133E-03

2.3088E-04

-2.0255E-05

1.3448E-06

-6.3118E-08

2.0244E-09

-4.1955E-11

5.0421E-13

-2.6611E-15

S8

-7.2431E-03

7.0061E-04

-6.3132E-05

4.5363E-06

-2.4723E-07

9.3617E-09

-2.1480E-10

2.2057E-12

9.9346E-15

S9

-3.4272E-03

2.7163E-04

-1.4678E-05

4.3447E-07

-1.4210E-08

6.3044E-10

-3.6719E-12

-1.1154E-12

5.1671E-14

S10

1.2400E-03

-5.3223E-05

5.1012E-06

-6.3990E-07

5.1793E-08

-2.5930E-09

7.8206E-11

-1.3063E-12

9.2626E-15

S11

3.7930E-03

-2.6124E-04

2.7717E-05

-2.8149E-06

2.1820E-07

-1.1511E-08

3.7935E-10

-6.6251E-12

3.0180E-14

S12

6.3583E-03

-5.5502E-04

5.6698E-05

-5.2304E-06

4.0174E-07

-2.3250E-08

9.1068E-10

-2.0950E-11

2.0565E-13

S13

-7.7880E-03

3.9442E-04

-4.2203E-05

1.8389E-06

5.8242E-08

-1.3331E-08

7.7365E-10

-2.0706E-11

2.1280E-13

S14

-1.2372E-02

1.8391E-03

-2.6919E-04

2.9365E-05

-2.2882E-06

1.2274E-07

-4.2738E-09

8.6598E-11

-7.7254E-13

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 third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface 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 8.09mm, the total length TTL of the optical imaging lens is 33.33mm, 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 60.7 °.

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.

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	7.3669	2.0000	1.55	56.1	Plastic material	-17.92	0.0000
									S2	Aspherical surface	3.8000	4.6503					-1.0000
S3	Aspherical surface	-7.8152	3.4046	1.64	23.5	Plastic material	59.70	0.0000
									S4	Aspherical surface	-7.6017	0.6608					0.0000
S5	Spherical surface	14.4698	3.8161	1.69	54.6	Glass	15.01
									S6	Spherical surface	-33.2660	1.3619
STO	Spherical surface	All-round	0.6040
									S7	Aspherical surface	13.2041	1.5000	1.66	20.4	Plastic material	-9.03	0.0000
S8	Aspherical surface	3.9438	0.4489					-1.0000
									S9	Aspherical surface	6.5756	3.8395	1.54	55.7	Plastic material	9.28	0.0000
S10	Aspherical surface	-16.3637	2.2941					0.0000
									S11	Aspherical surface	35.0032	3.0500	1.53	55.5	Glass	11.66	0.0000
S12	Aspherical surface	-7.3657	0.0300					0.0000
									S13	Aspherical surface	4.7834	1.1400	1.66	20.4	Plastic material	-19.37	0.0000
S14	Aspherical surface	3.1567	1.0270					-1.6117
									S15	Spherical surface	All-round	0.7000	1.52	64.2	Glass
S16	Spherical surface	All-round	2.8065
									S17	Spherical surface	All-round

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.5478E-03

1.5881E-05

-4.3900E-06

4.8763E-07

-2.8383E-08

9.7341E-10

-1.9768E-11

2.1982E-13

-1.0341E-15

S2

-1.2365E-03

-2.4428E-05

2.2033E-06

-4.8670E-08

-5.4715E-09

8.1766E-10

-5.3554E-11

1.9350E-12

-3.7107E-14

S3

6.1422E-04

-5.9144E-06

-1.2640E-06

1.3088E-07

-1.0860E-08

5.5006E-10

-1.7049E-11

3.0598E-13

-3.4629E-15

S4

5.4280E-04

-1.7817E-07

-6.1002E-07

5.6232E-08

-3.3831E-09

1.2180E-10

-2.1980E-12

5.2251E-15

4.2728E-16

S7

-2.9892E-03

2.3448E-04

-1.9255E-05

1.1680E-06

-5.0907E-08

1.5655E-09

-3.2112E-11

3.9148E-13

-2.1299E-15

S8

-6.9558E-03

6.6133E-04

-5.6387E-05

3.8061E-06

-1.9902E-07

7.3448E-09

-1.6467E-10

1.6552E-12

6.6332E-15

S9

-3.2200E-03

2.2279E-04

-9.7109E-06

2.0646E-07

-1.1156E-08

7.5348E-10

-1.2888E-11

-6.1076E-13

3.2418E-14

S10

7.4983E-04

-3.5385E-05

4.1467E-06

-4.8182E-07

3.6363E-08

-1.7609E-09

5.2984E-11

-9.0366E-13

6.6212E-15

S11

2.9977E-03

-2.0379E-04

2.2947E-05

-2.3467E-06

1.7812E-07

-9.1036E-09

2.9025E-10

-4.9005E-12

2.1215E-14

S12

5.3370E-03

-3.3780E-04

1.6985E-05

-1.1795E-07

-5.1091E-08

3.5964E-09

-9.7069E-11

5.3305E-13

1.3784E-14

S13

-7.7082E-03

4.7809E-04

-6.2948E-05

5.2735E-06

-3.3746E-07

1.7050E-08

-6.7622E-10

1.8087E-11

-2.3513E-13

S14

-1.1638E-02

1.6452E-03

-2.3063E-04

2.4052E-05

-1.8027E-06

9.4164E-08

-3.2283E-09

6.4871E-11

-5.7511E-13

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 third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface 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 8.04mm, the total length TTL of the optical imaging lens is 34.63mm, 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 60.7 °.

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.5157E-03

1.0055E-06

-5.8263E-07

1.0712E-07

-6.7570E-09

2.3237E-10

-4.6498E-12

5.0730E-14

-2.3443E-16

S2

-1.3215E-03

-1.8435E-05

2.8455E-06

-1.3053E-07

-1.3266E-09

7.3302E-10

-5.4865E-11

2.0397E-12

-3.9033E-14

S3

5.0919E-04

-5.0221E-06

-7.9633E-07

8.1896E-08

-7.1036E-09

3.7689E-10

-1.2418E-11

2.4450E-13

-3.0661E-15

S4

3.7714E-04

9.7641E-07

-4.5901E-07

4.0836E-08

-2.4294E-09

8.6873E-11

-1.6189E-12

7.8364E-15

1.9388E-16

S7

-3.2153E-03

2.1452E-04

-1.5637E-05

8.9506E-07

-3.8557E-08

1.2092E-09

-2.5660E-11

3.2384E-13

-1.8109E-15

S8

-6.6737E-03

5.8592E-04

-4.7678E-05

3.2011E-06

-1.6951E-07

6.3437E-09

-1.4385E-10

1.4846E-12

4.0916E-15

S9

-2.7473E-03

1.8759E-04

-8.4436E-06

2.5594E-07

-1.6631E-08

1.0101E-09

-2.7845E-11

2.2453E-13

2.9067E-15

S10

8.2967E-04

-2.8436E-05

2.7628E-06

-3.6684E-07

2.9210E-08

-1.4650E-09

4.5673E-11

-8.0645E-13

6.0904E-15

S11

3.1410E-03

-2.0146E-04

2.1230E-05

-2.1532E-06

1.6318E-07

-8.3444E-09

2.6713E-10

-4.5756E-12

2.2433E-14

S12

5.7223E-03

-4.3655E-04

4.0815E-05

-3.9724E-06

3.4742E-07

-2.2716E-08

9.7506E-10

-2.3849E-11

2.4441E-13

S13

-6.9295E-03

3.4871E-04

-3.3575E-05

2.6567E-07

2.2004E-07

-2.3284E-08

1.1549E-09

-2.9135E-11

2.8970E-13

S14

-1.1198E-02

1.5624E-03

-2.1381E-04

2.1031E-05

-1.4511E-06

6.8082E-08

-2.0317E-09

3.3924E-11

-2.3138E-13

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	0.95	0.95	0.95	0.95	0.95
TTL/EPD	3.60	3.82	3.64	3.92	4.10
						f1/(R1+R2)	-1.56	-1.56	-1.50	-1.61	-1.49
f5/(f3+f4)	1.39	1.67	1.76	1.55	1.95
						f/(f6+f7)	-1.18	-1.15	-1.29	-1.05	-0.85
(R5+R6)/(R3+R4)	2.54	1.14	1.07	1.22	1.15
						(R7+R8)/(R7-R8)	1.83	1.89	1.90	1.85	2.07
T12/(T34+T56)	1.15	1.13	1.08	1.09	1.00
						TTL/SL	1.81	1.89	1.80	1.91	1.94
f67/f345	1.32	1.49	1.70	1.35	1.41
						SAG42/(SAG51+SAG52)	1.80	1.94	1.93	2.01	1.93
SAG72/SAG71	2.52	2.12	2.46	2.03	1.68
						ET1/(ET3+ET5)	1.18	1.10	1.28	1.19	1.20
ET4/(ET6+ET7)	1.14	1.13	1.13	1.15	1.12

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 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 a negative optical power;

the third lens is a spherical lens made of glass;

at least three lenses of the fourth lens to the seventh lens are plastic lenses; 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 entrance pupil diameter EPD of the optical imaging lens meet the following requirements: TTL/EPD is more than 3.0 and less than 5.0.

2. The optical imaging lens of claim 1, wherein the effective focal length f1 of the first lens, the radius of curvature R1 of the object side surface of the first lens, and the radius of curvature R2 of the image side surface of the first lens satisfy: -2.0 < f1/(R1+ R2) < -1.2.

3. The optical imaging lens of claim 1, wherein the effective focal length f5 of the fifth lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy: 1.0 < f5/(f3+ f4) < 2.1.

4. The optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -1.4 < f/(f6+ f7) < -0.7.

5. The optical imaging lens of claim 1, wherein the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens satisfy: 0.9 < (R5+ R6)/(R3+ R4) < 2.7.

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: 1.5 < (R7+ R8)/(R7-R8) < 2.2.

7. The optical imaging lens according to claim 1, wherein a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T34 on the optical axis of the third lens and the fourth lens, and a separation distance T56 on the optical axis of the fifth lens and the sixth lens satisfy: 0.8 < T12/(T34+ T56) < 1.5.

8. The optical imaging lens of claim 1, wherein a combined focal length f67 of the sixth lens and the seventh lens and a combined focal length f345 of the third lens, the fourth lens and the fifth lens satisfy: f67/f345 is more than 1.2 and less than 1.8.

9. The optical imaging lens of claim 1, wherein a distance SAG42 on the optical axis from an intersection point of an image-side surface of the fourth lens and the optical axis to an effective radius vertex of an image-side surface of the fourth lens, a distance SAG51 on the optical axis from an intersection point of an object-side surface of the fifth lens and the optical axis to an effective radius vertex of an object-side surface of the fifth lens, and a distance SAG52 on the optical axis from an intersection point of an image-side surface of the fifth lens and the optical axis to an effective radius vertex of an image-side surface of the fifth lens satisfy: 1.6 < SAG42/(SAG51+ SAG52) < 2.4.

10. The optical imaging lens of claim 1, wherein a distance SAG71 on the optical axis from an intersection point of an object-side surface of the seventh lens and the optical axis to an effective radius vertex of the object-side surface of the seventh lens to a distance SAG72 on the optical axis from an intersection point of an image-side surface of the seventh lens and the optical axis to an effective radius vertex of the image-side surface of the seventh lens satisfies: 1.5 < SAG72/SAG71 < 2.7.

11. The optical imaging lens according to claim 1, wherein the edge thickness ET1 of the first lens, the edge thickness ET3 of the third lens and the edge thickness ET5 of the fifth lens satisfy: 1.0 < ET1/(ET3+ ET5) < 1.5.

12. The optical imaging lens according to claim 1, characterized in that the edge thickness ET4 of the fourth lens, the edge thickness ET6 of the sixth lens and the edge thickness ET7 of the seventh lens satisfy: 0.8 < ET4/(ET6+ ET7) < 1.3.

13. The optical imaging lens of any one of claims 1-12 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.

14. The optical imaging lens according to any one of claims 1 to 12, characterized in that the optical imaging lens further comprises a diaphragm,

the distance SL from the diaphragm to the imaging surface of the optical imaging lens on the optical axis and the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis satisfy the following conditions: TTL/SL is more than 1.6 and less than 2.1.

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 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 a negative optical power;

the third lens is a spherical lens made of glass;

at least three lenses of the fourth lens to the seventh lens are plastic lenses; and

an effective focal length f1 of the first lens, a radius of curvature R1 of an object-side surface of the first lens, and a radius of curvature R2 of an image-side surface of the first lens satisfy: -2.0 < f1/(R1+ R2) < -1.2.

16. The optical imaging lens of claim 15, wherein the effective focal length f5 of the fifth lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy: 1.0 < f5/(f3+ f4) < 2.1.

17. The optical imaging lens of claim 15, wherein the total effective focal length f of the optical imaging lens, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -1.4 < f/(f6+ f7) < -0.7.

18. The optical imaging lens of claim 15, wherein the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, the radius of curvature R5 of the object-side surface of the third lens, and the radius of curvature R6 of the image-side surface of the third lens satisfy: 0.9 < (R5+ R6)/(R3+ R4) < 2.7.

19. 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: 1.5 < (R7+ R8)/(R7-R8) < 2.2.

20. The optical imaging lens according to claim 15, wherein a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T34 on the optical axis of the third lens and the fourth lens, and a separation distance T56 on the optical axis of the fifth lens and the sixth lens satisfy: 0.8 < T12/(T34+ T56) < 1.5.

21. The optical imaging lens of claim 15, wherein a combined focal length f67 of the sixth lens and the seventh lens and a combined focal length f345 of the third lens, the fourth lens and the fifth lens satisfy: f67/f345 is more than 1.2 and less than 1.8.

22. The optical imaging lens of claim 15, wherein a distance SAG42 on the optical axis from an intersection point of an image-side surface of the fourth lens and the optical axis to an effective radius vertex of an image-side surface of the fourth lens, a distance SAG51 on the optical axis from an intersection point of an object-side surface of the fifth lens and the optical axis to an effective radius vertex of an object-side surface of the fifth lens, and a distance SAG52 on the optical axis from an intersection point of an image-side surface of the fifth lens and the optical axis to an effective radius vertex of an image-side surface of the fifth lens satisfy: 1.6 < SAG42/(SAG51+ SAG52) < 2.4.

23. The optical imaging lens of claim 15, wherein a distance SAG71 on the optical axis from an intersection point of an object-side surface of the seventh lens and the optical axis to an effective radius vertex of the object-side surface of the seventh lens to a distance SAG72 on the optical axis from an intersection point of an image-side surface of the seventh lens and the optical axis to an effective radius vertex of the image-side surface of the seventh lens satisfies: 1.5 < SAG72/SAG71 < 2.7.

24. The optical imaging lens according to claim 15, wherein the edge thickness ET1 of the first lens, the edge thickness ET3 of the third lens and the edge thickness ET5 of the fifth lens satisfy: 1.0 < ET1/(ET3+ ET5) < 1.5.

25. The optical imaging lens according to claim 15, wherein the edge thickness ET4 of the fourth lens, the edge thickness ET6 of the sixth lens and the edge thickness ET7 of the seventh lens satisfy: 0.8 < ET4/(ET6+ ET7) < 1.3.

26. The optical imaging lens of any one of claims 15-25 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.

27. The optical imaging lens of any one of claims 15 to 25, further comprising a diaphragm,

the distance SL from the diaphragm to the imaging surface of the optical imaging lens on the optical axis and the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis satisfy the following conditions: TTL/SL is more than 1.6 and less than 2.1.

Images