CN218675460U

CN218675460U - Optical lens group

Info

Publication number: CN218675460U
Application number: CN202221011352.3U
Authority: CN
Inventors: 姚志飞; 张晓彬; 闻人建科; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2023-03-21
Anticipated expiration: 2032-04-28

Abstract

The application discloses an optical lens assembly, include in order from the object side to picture side along the optical axis: a first lens with refractive power; a second lens element with refractive power having a convex object-side surface and a concave image-side surface; a third lens element with refractive power having one of an object-side surface and an image-side surface with positive curvature and the other with negative curvature; a fourth lens element with positive refractive power; a fifth lens element with positive refractive power; wherein, optical lens group satisfies: 0.9 and is formed by (f)/TTL <1.1 and sigma AT/BFL <0.3; wherein, TTL is a distance on the optical axis from the object side surface of the first lens element to the image plane, f is a total effective focal length of the optical lens group, Σ AT is a sum of distances on the optical axis from each adjacent two lens elements of the first lens element to the fifth lens element, and BFL is a distance on the optical axis from the image side surface of the fifth lens element to the image plane.

Description

Optical lens group

Technical Field

The present application relates to the field of optical elements, and in particular, to an optical lens assembly.

Background

In recent years, various demands such as high performance, miniaturization, and lightness and thinness have been put on optical lenses mounted on mobile phones, and telephoto lenses are increasingly used in mobile phone camera systems because they can photograph objects or scenes at a relatively long distance or even at a very long distance. Then, the telephoto lens and the matching element thereof have a larger volume, which often results in the over-thickness of the mobile phone when being applied to the mobile phone camera system, the use experience of the mobile phone is not good and the carrying is inconvenient, so how to make the telephoto lens satisfy the requirements of lightness, thinness and high performance at the same time is a problem that needs to be solved urgently at present.

SUMMERY OF THE UTILITY MODEL

The present application provides an optical lens assembly, in order from an object side to an image side along an optical axis comprising: a first lens with refractive power; a second lens element with refractive power having a convex object-side surface and a concave image-side surface; a third lens element with refractive power having a positive curvature on one of the object-side surface and the image-side surface and a negative curvature on the other; a fourth lens element with positive refractive power; a fifth lens element with positive refractive power; wherein, the optical lens group satisfies: 0.9 and once more than once f/TTL <1.1 and sigma AT/BFL <0.3; wherein, TTL is a distance on the optical axis from the object side surface of the first lens element to the imaging surface, f is a total effective focal length of the optical lens group, Σ AT is a sum of distances on the optical axis from each adjacent two lens elements of the first lens element to the fifth lens element, and BFL is a distance on the optical axis from the image side surface of the fifth lens element to the imaging surface.

In one embodiment of the present application, the optical lens group satisfies: 0.7< (ImgH + EPD)/BFL <1, wherein ImgH is half of the diagonal length of the effective pixel area on the imaging plane, BFL is the distance from the image side surface of the fifth lens to the imaging plane on the optical axis, and EPD is the entrance pupil diameter of the optical lens group.

In one embodiment of the present application, the optical lens group satisfies: 0.5 and +/-BFL tan (Semi-FOV)/ImgH is less than 0.8, wherein BFL is the distance from the image side surface of the fifth lens to the imaging surface on the optical axis, imgH is half of the diagonal length of the effective pixel area on the imaging surface, and Semi-FOV is the maximum half field angle of the optical lens group.

In one embodiment of the present application, the optical lens group satisfies: 0.5 +/-f star tan (Semi-FOV)/EPD <0.8, wherein f is the total effective focal length of the optical lens group, the Semi-FOV is the maximum half field angle of the optical lens group, and EPD is the entrance pupil diameter of the optical lens group.

In one embodiment of the present application, the optical lens set includes a diaphragm located between the first lens and the second lens, and satisfies: 2 & ltSD/EPD + SD/ImgH & lt 3 & gt, wherein EPD is the diameter of an entrance pupil of the optical lens group, imgH is half of the diagonal length of an effective pixel area on an imaging surface, and SD is the distance between the diaphragm and the image side surface of the fifth lens on the optical axis.

In one embodiment of the present application, the optical lens group satisfies: 0.8< (f 1-f 3)/f <1, wherein f is the total effective focal length of the optical lens group, f1 is the effective focal length of the first lens, and f3 is the effective focal length of the third lens.

In one embodiment of the present application, the optical lens group satisfies: 0.3-plus ct1/Σ CT <0.5, where CT1 is the central thickness of the first lens on the optical axis, and Σ CT is the sum of the central thicknesses of the respective lenses of the first lens to the fifth lens on the optical axis.

In one embodiment of the present application, the optical lens group satisfies: 0.5-plus CTmax/Σ AT <1.5, where CTmax is the maximum value among the center thicknesses of each of the first to fifth lenses on the optical axis, and Σ AT is the sum of the distances on the optical axis of each adjacent two of the first to fifth lenses.

In one embodiment of the present application, the optical lens group satisfies: 0.4< (T12 + T45)/(T23 + T34) <1.5, wherein T12 is a distance on an optical axis of the first lens and the second lens, T23 is a distance on an optical axis of the second lens and the third lens, T34 is a distance on an optical axis of the third lens and the fourth lens, and T45 is a distance on an optical axis of the fourth lens and the fifth lens.

In one embodiment of the present application, the optical lens group satisfies: 0.6< -Tr1r7/TD <0.9, wherein Tr1r7 is a distance on an optical axis from an object side surface of the first lens to an object side surface of the fourth lens, and TD is a distance on an optical axis from the object side surface of the first lens to an image side surface of the fifth lens.

In one embodiment of the present application, the optical lens group comprises a diaphragm located between the first lens and the second lens, and satisfies: 0.9 and sR/DT51<1.3, wherein SR is the effective radius of the diaphragm and DT51 is the effective radius of the object side surface of the fifth lens.

In one embodiment of the present application, the optical lens group satisfies: 0.2 plus ETmax/Σ ET <0.4, where Σ ET is the sum of the edge thicknesses of the respective lenses of the first to fifth lens pieces, and ETmax is the maximum value among the edge thicknesses of the respective lenses of the first to fifth lens pieces.

In one embodiment of the present application, the optical lens group satisfies:

0.8< (SAG 11+ SAG 12)/(SAG 11-SAG 12) <1.3, wherein SAG11 is the distance on the optical axis from the intersection point of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens; SAG12 is the distance on the optical axis from the intersection point of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens.

In one embodiment of the present application, the optical lens group satisfies: 0.3< -SAG 51/SAG52<0.9, wherein SAG51 is the distance on the optical axis from the intersection 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; the SAG52 is the distance 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 on the optical axis.

In one embodiment of the present application, the optical lens group satisfies: 0.5< (SAG 21+ SAG 22)/ET 2<1.2, wherein SAG21 is the distance from the intersection point of the object side surface and the optical axis of the second lens to the effective radius vertex of the object side surface of the second lens on the optical axis; 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, and ET2 is the edge thickness of the second lens.

In one embodiment of the present application, the first lens is made of glass, and any one of the second lens to the fifth lens is made of plastic.

The utility model provides an optical lens group has adopted multi-disc (for example, five) lenses, through the relation between the total effective focal length of reasonable control optical lens group and the system total length of optical lens group, can make optical lens group satisfy the long focal characteristic, can regard as the lectotype of periscope formula module camera lens to can make optical lens group realize system miniaturization and frivolousization under the prerequisite that satisfies imaging quality through effective restriction system total length. In addition, the ratio of the sum of the distances on the optical axis between any two adjacent lenses in the optical lens group from the first lens to the fifth lens to the distance on the optical axis from the image side surface of the fifth lens to the imaging surface is further controlled, so that the size of the tail end of the imaging system close to the imaging surface can be reasonably controlled, stray light caused by the tail end is effectively avoided, and the aberration of the optical system is effectively balanced.

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 is a schematic structural diagram of an optical lens group according to embodiment 1 of the present application;

fig. 2A to 2C respectively show an astigmatism curve, a distortion curve and a chromatic aberration of magnification curve of an optical lens assembly according to embodiment 1 of the present application;

FIG. 3 is a schematic view of an optical lens assembly according to embodiment 2 of the present application;

fig. 4A to 4C respectively show an astigmatism curve, a distortion curve and a chromatic aberration of magnification curve of an optical lens assembly according to embodiment 2 of the present application;

FIG. 5 is a schematic view of an optical lens assembly according to embodiment 3 of the present application;

fig. 6A to 6C respectively show an astigmatism curve, a distortion curve and a chromatic aberration of magnification curve of an optical lens assembly according to embodiment 3 of the present application;

FIG. 7 is a schematic view of an optical lens set according to embodiment 4 of the present application;

fig. 8A to 8C respectively show an astigmatism curve, a distortion curve and a chromatic aberration of magnification curve of an optical lens assembly according to embodiment 4 of the present application;

FIG. 9 is a schematic view of an optical lens assembly according to embodiment 5 of the present application;

10A to 10C respectively show an astigmatism curve, a distortion curve and a chromatic aberration of magnification curve of an optical lens set according to the embodiment 5 of the present application;

FIG. 11 is a schematic diagram of an optical lens assembly of embodiment 6 of the present application;

fig. 12A to 12C show an astigmatism curve, a distortion curve and a chromatic aberration of magnification curve, respectively, of an optical lens group according to embodiment 6 of the present application.

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, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

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 the list of listed features, that 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 accompanying drawings in conjunction with embodiments.

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

The optical lens assembly according to the present exemplary embodiment of the present application can include, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element with refractive power respectively.

In an exemplary embodiment, the first lens element can have positive refractive power, the object-side surface can be convex, and the image-side surface can be convex or concave, the second lens element can have positive or negative refractive power, the object-side surface can be convex, and the image-side surface can be concave, thereby forming a meniscus shape with the object side convex; the third lens element can have negative refractive power with a positive curvature on one of the object-side surface and the image-side surface and a negative curvature on the other, e.g., the object-side surface and the image-side surface of the third lens element can be concave and concave, respectively; the fourth lens element with positive refractive power has a convex object-side surface and a convex or concave image-side surface; the fifth lens element with positive refractive power has a concave object-side surface and a convex image-side surface, and thus has a meniscus shape convex toward the image side. The image pickup effect can be effectively improved by reasonably distributing the surface type and the refractive power of each lens of the optical lens group. In addition, the surface type of each lens can be reasonably controlled, and the resolving power of the optical lens group and the aberration of the optical lens group can be effectively improved by adjusting the path of the light in the optical system.

In an exemplary embodiment, the optical lens group further includes a prism, and the prism may be disposed on an object side surface of the first lens along the optical axis. The prism may have two optical axes that are orthogonal, an incident optical axis that is perpendicular to the incident surface of the prism and an exit optical axis that is perpendicular to the exit surface of the prism. The light from the object can sequentially pass through the incident surface of the prism along the incident optical axis, is reflected and deflected by 90 degrees by the reflecting surface of the prism, and then is emitted in the direction vertical to the emergent surface. The emergent optical axis of the prism and the optical axis of the optical lens group are positioned on the same straight line, and the light emitted from the emergent surface of the prism can sequentially pass through the second lens, the third lens, the fourth lens and the fifth lens and is finally projected onto the imaging surface. The optical axes are fused together to form the main optical axis of the periscopic telephoto lens.

In an exemplary embodiment, the optical lens set satisfies: 0.9 is formed by (f/TTL) less than 1.1 and (N5-N4)/(N3-N4) less than 2.5; wherein, TTL is a distance on the optical axis from the object side surface of the first lens element to the image plane, f is a total effective focal length of the optical lens assembly, N3 is a refractive index of the third lens element, N4 is a refractive index of the fourth lens element, and N5 is a refractive index of the fifth lens element. By reasonably controlling the ratio of the total effective focal length of the optical lens group to the distance from the object side surface of the first lens to the imaging surface on the optical axis, the lens group can meet the long-focus characteristic and has higher shooting performance, so that the shooting experience of a user can be improved, and the lens group can be used as a type selection of a periscopic module lens; in addition, the thickness of the shooting equipment (such as a mobile phone) can be reduced by reducing the size of the lens group on the optical axis when the condition formula range is met, so that the shooting equipment is light and thin, and the hand feeling and the carrying convenience of the shooting equipment are improved; in addition, the refractive indexes of the third lens, the fourth lens and the fifth lens are reasonably controlled, so that light rays can be reasonably converged, chromatic aberration is reduced, and shooting performance is further improved.

In an exemplary embodiment, the optical lens group satisfies: 0.7< (ImgH + EPD)/BFL <1, wherein ImgH is half of the diagonal length of the effective pixel area on the imaging plane, BFL is the distance from the image side surface of the fifth lens to the imaging plane on the optical axis, and EPD is the entrance pupil diameter of the optical lens group. Satisfying above-mentioned conditional expression scope, can making every visual field chief ray incident angle of optical system match the CRA of chip better, simultaneously through effectively restricting EPD and BFL's size, reduce the parasitic light risk that BFL too big brought, reduce the design degree of difficulty.

In an exemplary embodiment, the optical lens group satisfies: 0.5< -BFL tan (Semi-FOV)/Imgh <0.8, wherein BFL is the distance from the image side surface of the fifth lens to the imaging surface on the optical axis, imgh is half of the diagonal length of the effective pixel area on the imaging surface, and Semi-FOV is the maximum half field angle of the optical lens group. By reasonably controlling the sizes of the BFL and the Semi-FOV, the veiling glare risk caused by overlarge BFL can be reduced, and photos shot in the view field can be clear enough, so that better shooting experience is brought to users.

In an exemplary embodiment, the optical lens group satisfies: 0.5 +/-f star tan (Semi-FOV)/EPD <0.8, wherein f is the total effective focal length of the optical lens group, the Semi-FOV is the maximum half field angle of the optical lens group, and EPD is the entrance pupil diameter of the optical lens group. By reasonably distributing the relation among the total effective focal length, the maximum half field angle and the entrance pupil diameter of the optical lens group, the parasitic light risk caused by a large field of view can be reduced, and the aperture value of the optical system is effectively controlled, so that the shooting effect is better.

In an exemplary embodiment, the optical lens set comprises a diaphragm located between a first lens and a second lens, and satisfies: 2 & ltSD/EPD + SD/ImgH & lt 3 & gt, wherein EPD is the diameter of an entrance pupil of the optical lens group, imgH is half of the diagonal length of an effective pixel area on an imaging surface, and SD is the distance between a diaphragm and the image side surface of the fifth lens on an optical axis. Through reasonably distributing the diameter of the entrance pupil, the distance from the diaphragm to the image side surface of the fifth lens on the axis and the half of the diagonal length of the effective pixel area on the imaging surface, the optical system has better shooting effect under a certain diameter of the entrance pupil.

In an exemplary embodiment, the optical lens set satisfies: 0.8< (f 1-f 3)/f <1, wherein f is the total effective focal length of the optical lens group, f1 is the effective focal length of the first lens, and f3 is the effective focal length of the third lens. Through the total effective focal length of the optical lens group, the effective focal length of the first lens and the effective focal length of the third lens which are reasonably distributed, the sensitivity of the optical system is favorably reduced, and light rays can have better convergence and divergence so as to balance the aberration of the optical system.

In an exemplary embodiment, the optical lens set satisfies: 0.3-plus ct1/Σ CT <0.5, where CT1 is the central thickness of the first lens on the optical axis, and Σ CT is the sum of the central thicknesses of the respective first to fifth lenses on the optical axis. By effectively controlling the ratio of the central thickness of the first lens on the optical axis to the sum of the central thicknesses of the first lens to the fifth lens on the optical axis, light can obtain better convergence on the first lens, and the sensitivity of the first lens can be reduced, so that the difficulty of processing and assembling the lenses is reduced.

In an exemplary embodiment, the optical lens set satisfies: 0.5< -CTmax/AT <1.5 >, wherein CTmax is the maximum value of the central thicknesses of the respective first to fifth lenses on the optical axis, and Σ AT is the sum of the distances on the optical axis of the respective adjacent two lenses of the first to fifth lenses. By reasonably limiting the ratio of the maximum value of the central thicknesses of the first lens to the fifth lens on the optical axis to the sum of the distances between any two adjacent lenses of the first lens to the fifth lens on the optical axis, the optical lens group has higher convergence performance on light rays, and thus the aberration and sensitivity of the optical system can be balanced.

In an exemplary embodiment, the optical lens set satisfies: 0.4< (T12 + T45)/(T23 + T34) <1.5, where T12 is a distance between the first lens and the second lens on the optical axis, T23 is a distance between the second lens and the third lens on the optical axis, T34 is a distance between the third lens and the fourth lens on the optical axis, and T45 is a distance between the fourth lens and the fifth lens on the optical axis. Through rationally limiting the distance of the first lens and the second lens on the optical axis, the distance of the second lens and the third lens on the optical axis, the distance of the third lens and the fourth lens on the optical axis and the distance of the fourth lens and the fifth lens on the optical axis, the lens is favorable for avoiding unnecessary parasitic light risks caused by overlarge distance between the lenses, and the aberration caused by each lens can be well balanced, thereby obtaining better shooting effect.

In an exemplary embodiment, the optical lens set satisfies: 0.6< -Tr1r7/TD <0.9, wherein Tr1r7 is the distance on the optical axis from the object side surface of the first lens to the object side surface of the fourth lens, and TD is the distance on the optical axis from the object side surface of the first lens to the image side surface of the fifth lens. The optical lens group has the characteristic of miniaturization by reasonably controlling the ratio of the axial distance from the object side surface of the first lens to the object side surface of the fourth lens to the axial distance from the object side surface of the first lens to the image side surface of the fifth lens, and sensitivity improvement and parasitic light risk of an optical system caused by overlarge thickness of the fourth lens or overlarge distance between the lenses can be effectively avoided.

In an exemplary embodiment, the optical lens group satisfies: Σ AT/BFL <0.3, where Σ AT is the sum of distances on the optical axis of each adjacent two of the first to fifth lenses, and BFL is the distance on the optical axis from the image side surface of the fifth lens to the image plane. Through effectively restricting the ratio of the sum of the distance on the optical axis between any two adjacent lenses in the first lens to the fifth lens and the distance on the optical axis from the image side surface of the fifth lens to the imaging surface, not only can the problem that the size of the lens group close to the tail end (for example, the tail end of the lens barrel) is unreasonable and brings the stray light risk caused by the too small BFL be avoided, thereby being beneficial to balancing the aberration of the optical system, but also the total length of the system can be controlled, and the miniaturization and the lightness and thinness of the optical group are further improved.

In an exemplary embodiment, the optical lens group comprises a diaphragm located between a first lens and a second lens, and satisfies: 0.9 and sR/DT51<1.3, wherein SR is the effective radius of the diaphragm and DT51 is the effective radius of the object side surface of the fifth lens. Effective radius through the effective radius of restriction diaphragm and the effective radius of the object side of fifth lens, be favorable to the better convergence of light, lens cone tail end size can be controlled in reasonable scope simultaneously, satisfies the module end demand.

In an exemplary embodiment, the optical lens group satisfies: 0.2 instead of ETmax/Σ ET <0.4, where Σ ET is the sum of the edge thicknesses of the respective first to fifth lens pieces, and ETmax is the maximum value among the edge thicknesses of the respective first to fifth lens pieces. The ratio of the maximum value of the edge thicknesses of the first lens to the fifth lens to the sum of the edge thicknesses of the first lens to the fifth lens is reasonably controlled, so that the increase of processing difficulty caused by overlarge edge thickness of the lens is favorably avoided.

In an exemplary embodiment, the optical lens set satisfies: 0.8< (SAG 11+ SAG 12)/(SAG 11-SAG 12) <1.3, wherein SAG11 is the distance on the optical axis from the intersection point of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens; the SAG12 is a distance 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. Through the axial distance between the effective radius summit of the intersection point of the object side surface of the reasonable control first lens and the optical axis to the object side surface of the first lens and the axial distance between the effective radius summit of the intersection point of the image side surface of the first lens and the optical axis to the image side surface of the first lens, the convergence of light rays is facilitated, and the processing difficulty is reduced.

In an exemplary embodiment, the optical lens group satisfies: 0.3 instead of SAG51/SAG52<0.9, wherein SAG51 is the 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; SAG52 is the 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. Through the reasonable control of the axial distance between the intersection point of the object side surface and the optical axis of the fifth lens and the effective radius vertex of the object side surface of the fifth lens and the axial distance between the intersection point of the image side surface and the optical axis of the fifth lens and the effective radius vertex of the image side surface of the fifth lens, the aberration of an optical system is favorably balanced, the sensitivity of the fifth lens is reduced, and the processing difficulty is reduced.

In an exemplary embodiment, the optical lens set satisfies: 0.5< (SAG 21+ SAG 22)/ET 2<1.2, wherein SAG21 is the distance 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 on the optical axis; 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, and ET2 is the edge thickness of the second lens. Through the effective on-axis distance between the object side of the effective restriction second lens and the effective radius summit of the nodical object side of optical axis to the second lens, the image side of second lens and the nodical on-axis distance between the effective radius summit of the image side of optical axis to the second lens and the edge thickness of second lens, be favorable to the second lens convergent light, thereby effectively reduce the bore of lens at the back and reduce the height of lens cone, satisfy module end demand, still balanced system's aberration in addition, promote the ability that optical system caught light, promote the shooting effect.

In an exemplary embodiment, the first lens is made of glass, and any one of the second lens to the fifth lens is made of plastic. The first lens is made of glass materials, so that the first lens has higher Abbe number and higher refractive index, and the size of the optical lens group can be reduced; any one of the second lens to the fifth lens is made of a plastic material, so that the cost of the optical lens group is saved, and the processing difficulty of the lenses is reduced while high imaging quality is obtained.

In an exemplary embodiment, the optical lens group 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 image plane.

The optical lens set according to the above embodiments of the present application may employ a plurality of lenses, such as the above five lenses. By reasonably distributing the refractive power, the surface shape, the center thickness of each lens, the on-axis distance between each lens and the like of each lens, the low-order aberration of the optical lens group can be effectively balanced and controlled, meanwhile, the tolerance sensitivity can be reduced, and the miniaturization of the optical lens group is kept.

In an embodiment of the present application, at least one of the mirror surfaces of each of the first to fifth lenses is an aspherical mirror surface. The aspheric lens has the characteristics 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 lens center to the lens periphery, an aspherical lens has a better curvature radius characteristic, 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, the object-side surface and the image-side surface of each of the first lens to the fifth lens are aspheric mirror surfaces.

However, it is understood by those skilled in the art that the number of lenses constituting the optical lens group may be varied to obtain the respective results and advantages described in the present description without departing from the technical solutions claimed in the present application. For example, although five lenses are exemplified in the embodiment, the optical lens group is not limited to include five lenses. The optical lens set can also include other numbers of lenses if desired.

Specific examples of optical lens sets that can be applied to the above embodiments are further described below with reference to the accompanying drawings.

Example 1

An optical lens set according to embodiment 1 of the present application is described below with reference to fig. 1 to 2C. As shown in fig. 1, the optical lens assembly, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an image plane S13.

The first lens element E1 with positive refractive power has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 with positive refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with negative refractive power has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 with positive refractive power has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 with positive refractive power has a concave object-side surface S9 and a convex image-side surface S10. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

Table 1 shows a basic parameter table of the optical lens group of example 1, wherein the unit of the radius of curvature, the thickness/distance focal length, and the effective radius are all millimeters (mm).

TABLE 1

In this embodiment, the total effective focal length f of the optical lens assembly is 18.40mm, the on-axis distance TTL between the object-side surface S1 of the first lens element E1 and the imaging surface S13 is 18.72mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S13 is 3.47mm, and the maximum half field angle Semi-FOV of the optical lens assembly is 10.08 °. In addition, in the embodiment, the refractive indexes of the third lens and the fifth lens are respectively controlled to be larger than the refractive indexes of the first lens, the second lens and the fourth lens, so that the third lens and the fifth lens have higher refractive indexes, the total length of the optical lens assembly on the optical axis can be limited, and the light rays can be reasonably converged and the chromatic aberration can be reduced.

In the present embodiment, the aspheric surface type x included in the object-side surface and the image-side surface of the lenses of the first lens E1 to the fifth lens E5 can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =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 aspheric surface. Table 2 below gives the coefficients A4, A6, A8, a10 and a11 of high-order terms that can be used for the aspherical mirror S7 in example 1.

Flour mark	A4	A6	A8	A10
					S7	8.7328E-05	-8.0647E-05	-3.4070E-05	-1.3156E-06

TABLE 2

Fig. 2A shows the astigmatism curves of the optical lens group of example 1, which represent meridional field curvature and sagittal field curvature. Fig. 2B shows a distortion curve of the optical lens assembly of example 1, which represents the distortion magnitude corresponding to different image heights. Fig. 2C shows a chromatic aberration of magnification curve of the optical lens assembly of example 1, which represents the deviation of different image heights of light rays passing through the optical lens assembly on the image plane. As can be seen from fig. 2A to 2C, the optical lens assembly of embodiment 1 can achieve good imaging quality.

Example 2

An optical lens set according to embodiment 2 of the present application is described below with reference to fig. 3 to 4C. As shown in fig. 3, the optical lens assembly, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an image plane S13.

Table 3 shows a basic parameter table of the optical lens group of example 2, wherein the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

TABLE 3

In this embodiment, the total effective focal length f of the optical lens assembly is 19.36mm, the axial distance TTL between the object-side surface S1 of the first lens element E1 and the image plane S13 is 19.26mm, the half of the diagonal length ImgH of the effective pixel area on the image plane S13 is 3.47mm, and the maximum half field angle Semi-FOV of the optical lens assembly is 9.86 °. The refractive indexes of the third lens and the fifth lens are respectively controlled to be larger than the refractive indexes of the first lens, the second lens and the fourth lens, so that the third lens and the fifth lens have higher refractive indexes, the total length of the optical lens group on an optical axis can be limited, light rays can be converged reasonably, and chromatic aberration can be reduced.

Table 4 shows the high-order term coefficients A4, A6, A8, a10, a11, and a12 of the respective mirror surfaces usable for the aspherical surfaces S7 to S10 in embodiment 2, wherein the respective aspherical surface types can be defined by the formula (1) given in embodiment 1 above.

Flour mark

A4

A6

A8

A10

A11

A12

S7

-8.7238E-04

-6.3695E-04

2.6713E-04

-2.4668E-05

0.0000E+00

S8

6.0455E-04

-5.3345E-04

1.9482E-04

7.7895E-06

-5.3821E-06

2.5748E-07

S9

5.7688E-04

-1.6141E-04

2.7833E-06

-2.1491E-06

-1.6595E-06

0.0000E+00

S10

4.9443E-05

7.7557E-06

-2.8035E-05

-3.1061E-06

1.1323E-07

0.0000E+00

TABLE 4

Fig. 4A shows the astigmatism curves of the optical lens group of example 2, which represent meridional field curvature and sagittal field curvature. Fig. 4B shows a distortion curve of the optical lens assembly of example 2, which represents the distortion magnitude corresponding to different image heights. Fig. 4C shows a chromatic aberration of magnification curve of the optical lens assembly of example 2, which represents the deviation of different image heights of light rays passing through the optical lens assembly on the image plane. As can be seen from fig. 4A to 4C, the optical lens assembly of embodiment 2 can achieve good imaging quality.

Example 3

An optical lens set according to embodiment 3 of the present application is described below with reference to fig. 5 to 6C. As shown in fig. 5, the optical lens assembly, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an image plane S13.

The first lens element E1 with positive refractive power has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 with positive refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with negative refractive power has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 with positive refractive power has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 with positive refractive power has a concave object-side surface S9 and a convex image-side surface S10. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

Table 5 shows a basic parameter table for the optical lens set of example 3, wherein the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 5

In this embodiment, the total effective focal length f of the optical lens assembly is 19.13mm, the distance TTL between the object-side surface S1 of the first lens element E1 and the imaging surface S13 on the optical axis is 19.13mm, a half ImgH of the diagonal length of the effective pixel area on the imaging surface S13 is 3.47mm, and the maximum half field angle Semi-FOV of the optical lens assembly is 9.94 °. The refractive indexes of the third lens and the fifth lens are respectively controlled to be larger than the refractive indexes of the first lens, the second lens and the fourth lens, so that the third lens and the fifth lens have higher refractive indexes, the total length of the optical lens group on the optical axis can be limited, light rays can be converged reasonably, and chromatic aberration can be reduced.

Table 6 shows the high-order coefficient coefficients A4, A6, A8, a10, and a11 that can be used for the aspherical mirrors S7 and S8 in example 3.

Flour mark	A4	A6	A8	A10	A11
						S7	-1.9322E-03	-2.3392E-04	-4.2181E-05	8.1749E-06	-9.4232E-07
S8	-1.1810E-03	-3.4930E-04	1.4113E-05	-4.7625E-06	3.3447E-07

TABLE 6

FIG. 6A shows the astigmatism curves of the optical lens assembly of example 3, which represent meridional field curvature and sagittal field curvature. Fig. 6B shows a distortion curve of the optical lens assembly of example 3, which represents the distortion magnitude corresponding to different image heights. Fig. 6C shows a chromatic aberration of magnification curve of the optical lens assembly of example 3, which represents the deviation of different image heights of light rays passing through the optical lens assembly on the image plane. As can be seen from fig. 6A to 6C, the optical lens assembly of embodiment 3 can achieve good imaging quality.

Example 4

An optical lens set according to embodiment 4 of the present application is described below with reference to fig. 7 to 8C. As shown in fig. 7, the optical lens assembly, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an image plane S13.

The first lens element E1 with positive refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with negative refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with negative refractive power has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 with positive refractive power has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 with positive refractive power has a concave object-side surface S9 and a convex image-side surface S10. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 7 shows a basic parameter table of the optical lens group of example 4, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

TABLE 7

In this embodiment, the total effective focal length f of the optical lens assembly is 17.50mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the image plane S13 is 19.00mm, the half ImgH of the diagonal length of the effective pixel area on the image plane S13 is 3.67mm, and the maximum half field angle Semi-FOV of the optical lens assembly is 11.80 °. The refractive indexes of the third lens and the fifth lens are respectively controlled to be larger than the refractive indexes of the first lens, the second lens and the fourth lens, so that the third lens and the fifth lens have higher refractive indexes, the total length of the optical lens group on an optical axis can be limited, light rays can be converged reasonably, and chromatic aberration can be reduced.

Tables 8 and 9 show the high-order term coefficients A4, A6, A8, a10, a11, a12, a13, a14, a15, a16, a17, a18, and a19 of the respective mirror surfaces that can be used for the aspherical surfaces S1 to S10 in example 4, wherein the respective aspherical surface types can be defined by the formula (1) given in example 1 above.

Flour mark

A4

A6

A8

A10

A11

A12

A13

S1

0.0000E+00

S2

0.0000E+00

S3

-1.2509E-04

7.1678E-04

-5.1620E-04

9.8696E-05

6.0653E-05

-4.4978E-05

1.2808E-05

S4

-3.9926E-03

1.1612E-02

-1.0570E-02

3.5170E-03

1.4184E-03

-1.9903E-03

9.5327E-04

S5

-2.7159E-02

8.3560E-02

-1.1627E-01

9.9887E-02

-5.6527E-02

2.1425E-02

-5.2532E-03

S6

-4.6769E-02

1.2046E-01

-1.6120E-01

1.3576E-01

-7.5099E-02

2.7788E-02

-6.7281E-03

S7

-3.4242E-02

4.6192E-02

-2.3956E-02

-3.7055E-02

1.0070E-01

-1.2576E-01

1.0317E-01

S8

-2.1323E-02

4.8760E-03

6.5270E-02

-1.8755E-01

2.8997E-01

-2.9862E-01

2.1615E-01

S9

-7.2155E-03

-9.8585E-03

5.6360E-02

-1.1660E-01

1.4580E-01

-1.2273E-01

7.2027E-02

S10

-8.1114E-04

-9.8461E-03

2.9761E-02

-5.1478E-02

5.8862E-02

-4.6500E-02

2.5836E-02

TABLE 8

Flour mark

A14

A15

A16

A17

A18

A19

S1

0.0000E+00

S2

0.0000E+00

S3

-1.7959E-06

1.0246E-07

0.0000E+00

S4

-2.3359E-04

2.4070E-05

0.0000E+00

S5

7.4792E-04

-4.6151E-05

0.0000E+00

S6

9.7315E-04

-6.3968E-05

0.0000E+00

S7

-5.9126E-02

2.3774E-02

-6.5638E-03

1.1834E-03

-1.2532E-04

5.9041E-06

S8

-1.1138E-01

4.0580E-02

-1.0202E-02

1.6817E-03

-1.6340E-04

7.0871E-06

S9

-2.9570E-02

8.3237E-03

-1.5300E-03

1.6534E-04

-7.9638E-06

0.0000E+00

S10

-1.0069E-02

2.6923E-03

-4.6995E-04

4.8190E-05

-2.2001E-06

0.0000E+00

TABLE 9

Fig. 8A shows an astigmatism curve representing meridional and sagittal image planes curvature of the optical lens group of example 4. Fig. 8B shows a distortion curve of the optical lens assembly of example 4, which represents the distortion magnitude corresponding to different image heights. Fig. 8C shows the chromatic aberration of magnification curve of the optical lens assembly of example 4, which shows the deviation of different image heights on the image plane after the optical lens assembly. As can be seen from fig. 8A to 8C, the optical lens assembly of embodiment 4 can achieve good imaging quality.

Example 5

An optical lens set according to embodiment 5 of the present application is described below with reference to fig. 9 to 10C. As shown in fig. 9, the optical lens assembly, in order from an object side to an image side along an optical axis, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an image plane S13.

Table 10 shows a basic parameter table for the optical lens set of example 5, wherein the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

Watch 10

In this embodiment, the total effective focal length f of the optical lens assembly is 19.23mm, the distance TTL between the object-side surface S1 of the first lens element E1 and the imaging surface S13 on the optical axis is 19.13mm, a half ImgH of the diagonal length of the effective pixel area on the imaging surface S13 is 3.47mm, and the maximum half field angle Semi-FOV of the optical lens assembly is 9.96 °.

Table 11 shows the high-order term coefficients A4, A6, A8, a10, a11, and a12 of each mirror surface usable for the aspherical surfaces S7 and S8 in example 5, wherein each aspherical surface type can be defined by the formula (1) given in example 1 above.

Flour mark	A4	A6	A8	A10	A11
						S7	1.3661E-04	-8.2402E-05	-1.8771E-05	-2.6465E-07	-2.5274E-07
S8	-3.3230E-04	-1.5048E-04	-1.4713E-05	-1.5094E-06	-1.7874E-07

TABLE 11

Fig. 10A shows the astigmatism curves of the optical lens group of example 5, which represent meridional field curvature and sagittal field curvature. Fig. 10B shows a distortion curve of the optical lens assembly of example 5, which represents the distortion magnitude corresponding to different image heights. Fig. 10C shows a chromatic aberration of magnification curve of the optical lens assembly of example 5, which represents the deviation of different image heights of light rays passing through the optical lens assembly on the image plane. As can be seen from fig. 10A to 10C, the optical lens assembly of embodiment 5 can achieve good imaging quality.

Example 6

An optical lens set according to embodiment 6 of the present application is described below with reference to fig. 11 to 12C. As shown in fig. 11, the optical lens assembly, in order from an object side to an image side along an optical axis, includes: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an image plane S13.

Table 12 shows a basic parameter table for the optical lens set of example 6, wherein the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all millimeters (mm).

TABLE 12

In this embodiment, the total effective focal length f of the optical lens assembly is 18.92mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the image plane S13 is 18.82mm, the half ImgH of the diagonal length of the effective pixel area on the image plane S13 is 3.47mm, and the maximum half field angle Semi-FOV of the optical lens assembly is 10.31 °. The refractive indexes of the third lens and the fifth lens are respectively controlled to be larger than the refractive indexes of the first lens, the second lens and the fourth lens, so that the third lens and the fifth lens have higher refractive indexes, the total length of the optical lens group on an optical axis can be limited, light rays can be converged reasonably, and chromatic aberration can be reduced.

Table 13 shows the high-order term coefficients A4, A6, A8, a10, a11, and a12 of each mirror surface usable for the aspherical surfaces S7 and S8 in example 6, wherein each aspherical surface type can be defined by the formula (1) given in example 1 above.

Flour mark

A4

A6

A8

A10

A11

A12

S7

-4.3161E-04

-4.6081E-04

9.7552E-05

-1.6048E-05

0.0000E+00

S8

2.6895E-04

-3.0084E-04

-4.2312E-05

4.9785E-05

-1.4909E-05

1.3465E-06

Watch 13

Figure 12A shows the astigmatism curves for the optical lens group of example 6 representing meridional and sagittal image planes curvature. Fig. 12B shows a distortion curve of the optical lens assembly of example 6, which represents the distortion magnitude corresponding to different image heights. Fig. 12C shows a chromatic aberration of magnification curve of the optical lens assembly of example 6, which shows the deviation of different image heights of light passing through the optical lens assembly on the image plane. As can be seen from fig. 12A to 12C, the optical lens assembly of embodiment 6 can achieve good imaging quality.

In summary, examples 1 to 6 each satisfy the relationship shown in table 14.

Conditions/examples	1	2	3	4	5	6
							f/TTL	0.98	1.01	1.00	0.92	1.01	1.01
(N5-N4)/(N3-N4)	2.25	1.17	2.17	1.00	1.50	1.38
							∑AT/BFL	0.26	0.25	0.23	0.17	0.22	0.12
(ImgH+EPD)/BFL	0.80	0.81	0.85	0.78	0.81	0.74
							BFL*tan(Semi-FOV)/ImgH	0.58	0.56	0.53	0.63	0.56	0.63
f*tan(Semi-FOV)/EPD	0.59	0.60	0.61	0.74	0.61	0.63
							SD/EPD+SD/ImgH	2.33	2.60	2.61	2.55	2.52	2.39
(f1-f3)/f	0.91	0.96	0.95	0.95	0.88	0.94
							CT1/∑CT	0.46	0.31	0.44	0.39	0.40	0.31
CTmax/∑AT	0.74	0.60	1.11	1.29	0.88	1.23
							(T12+T45)/(T23+T34)	0.72	1.27	0.50	0.57	0.44	0.61
Tr1r7/TD	0.82	0.69	0.80	0.71	0.80	0.72
							SR/DT51	0.99	1.09	1.21	1.23	1.02	1.12
ETmax/∑ET	0.35	0.22	0.37	0.32	0.33	0.34
							(SAG11+SAG12)/(SAG11-SAG12)	0.87	0.84	0.87	1.29	0.85	0.85
SAG51/SAG52	0.70	0.80	0.66	0.35	0.72	0.76
							(SAG21+SAG22)/ET2	1.10	1.18	0.69	0.67	0.84	0.55

TABLE 14

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 protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the scope of the present application. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

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

a first lens with refractive power;

a second lens element with refractive power having a convex object-side surface and a concave image-side surface;

a third lens element with refractive power having a positive curvature on one of the object-side surface and the image-side surface and a negative curvature on the other;

a fourth lens element with positive refractive power;

a fifth lens element with positive refractive power; wherein the content of the first and second substances,

the optical lens group satisfies:

f/TTL is more than 0.9 and less than 1.1, and sigma AT/BFL is less than 0.3;

wherein, TTL is a distance on the optical axis from the object side surface of the first lens element to the imaging surface, f is a total effective focal length of the optical lens group, Σ AT is a sum of distances on the optical axis from each adjacent two lens elements of the first lens element to the fifth lens element, and BFL is a distance on the optical axis from the image side surface of the fifth lens element to the imaging surface.

2. The optical lens group of claim 1, wherein the optical lens group satisfies:

0.7＜(ImgH+EPD)/BFL＜1，

wherein ImgH is a half of a diagonal length of an effective pixel area on an imaging surface, BFL is a distance from an image side surface of the fifth lens to the imaging surface on an optical axis, and EPD is an entrance pupil diameter of the optical lens group.

3. The optical lens group of claim 1, wherein the optical lens group satisfies:

0.5＜BFL*tan(Semi-FOV)/ImgH＜0.8，

the BFL is a distance from an image side surface of the fifth lens to an imaging surface on an optical axis, the ImgH is a half of a diagonal length of an effective pixel area on the imaging surface, and the Semi-FOV is a maximum half field angle of the optical lens group.

4. The set of optical lenses of claim 1, wherein the set of optical lenses satisfies:

0.5＜f*tan(Semi-FOV)/EPD＜0.8，

wherein f is the total effective focal length of the optical lens set, the Semi-FOV is the maximum half field angle of the optical lens set, and the EPD is the entrance pupil diameter of the optical lens set.

5. The optical lens group of claim 1, comprising a diaphragm between the first and second lens elements, and wherein:

2＜SD/EPD+SD/ImgH＜3，

the EPD is the diameter of the entrance pupil of the optical lens group, imgH is half of the diagonal length of the effective pixel area on the imaging plane, and SD is the distance between the diaphragm and the image side surface of the fifth lens on the optical axis.

6. The optical lens group of claim 1, wherein the optical lens group satisfies:

0.8＜(f1-f3)/f＜1，

wherein f is the total effective focal length of the optical lens set, f1 is the effective focal length of the first lens, and f3 is the effective focal length of the third lens.

7. The set of optical lenses of claim 1, wherein the set of optical lenses satisfies:

0.3＜CT1/∑CT＜0.5

wherein CT1 is a central thickness of the first lens on the optical axis, and Σ CT is a sum of central thicknesses of the first lens to the fifth lens on the optical axis.

8. The set of optical lenses of claim 1, wherein the set of optical lenses satisfies:

0.5＜CTmax/∑AT＜1.5，

wherein CTmax is a maximum value of center thicknesses of the first lens to the fifth lens on the optical axis, and Σ AT is a sum of distances on the optical axis of each adjacent two of the first lens to the fifth lens.

9. The optical lens group of claim 1, wherein the optical lens group satisfies:

0.4＜(T12+T45)/(T23+T34)＜1.5，

wherein T12 is a distance on an optical axis between the first lens and the second lens, T23 is a distance on an optical axis between the second lens and the third lens, T34 is a distance on an optical axis between the third lens and the fourth lens, and T45 is a distance on an optical axis between the fourth lens and the fifth lens.

10. The set of optical lenses of claim 1, wherein the set of optical lenses satisfies:

0.6＜Trlr7/TD＜0.9，

wherein Trlr7 is an axial distance between an object-side surface of the first lens and an object-side surface of the fourth lens, and TD is an axial distance between the object-side surface of the first lens and an image-side surface of the fifth lens.

11. The optical lens group of claim 1, comprising a diaphragm between the first and second lens elements, and wherein:

0.9＜SR/DT51＜1.3，

wherein SR is an effective radius of the diaphragm, and DT51 is an effective radius of an object-side surface of the fifth mirror.

12. The optical lens group of claim 1, wherein the optical lens group satisfies:

0.2＜ETmax/∑ET＜0.4，

where Σ ET is the sum of the edge thicknesses of each of the first to fifth lens pieces, and ETmax is the maximum value among the edge thicknesses of each of the first to fifth lens pieces.

13. The optical lens group of claim 1, wherein the optical lens group satisfies:

0.8＜(SAG11+SAG12)/(SAG11-SAG12)＜1.3，

SAG11 is the distance from the intersection point of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens on the optical axis; SAG12 is the distance on the optical axis from the intersection point of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens.

14. The optical lens group of claim 1, wherein the optical lens group satisfies:

0.3＜SAG51/SAG52＜0.9，

SAG51 is the distance 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 on the optical axis; SAG52 is the distance 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 on the optical axis.

15. The set of optical lenses of claim 1, wherein the set of optical lenses satisfies:

0.5＜(SAG21+SAG22)/ET2＜1.2，

SAG21 is the distance 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 on the optical axis; 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, and ET2 is the edge thickness of the second lens.

16. The optical lens assembly of claim 1, wherein the first lens element is made of glass, and any one of the second lens element to the fifth lens element is made of plastic.