Optical lens

Abstract

The application provides an optical lens. The optical lens comprises a lens barrel, a lens set and a plurality of spacer elements accommodated in the lens barrel; the lens set comprises, in sequence from an object side to an image side along an optical axis direction, a first lens with negative refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power and a fifth lens with negative refractive power; the plurality of spacer elements comprises a first spacer element arranged on the image side of the first lens and in contact with the image side surface of the first lens, a second spacer element arranged on the image side of the second lens and in contact with the image side surface of the second lens, a second auxiliary spacer element arranged on the image side of the second spacer element and in contact with the image side surface of the second spacer element, a third spacer element arranged on the image side of the third lens and in contact with the image side surface of the third lens, and a fourth spacer element arranged on the image side of the fourth lens and in contact with the image side surface of the fourth lens; the optical lens satisfies 1.30 < L / (d0m-d0s) < 2.05; and 5.75 < f2 / (CP2+CP2b) < 9.40.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging lenses, and in particular to an optical lens. BACKGROUND

[0002] Currently, smart glasses with camera and photography functions are being accepted by more and more people due to their portability and interactivity, and the smart glasses lenses also have a more broad application prospect.

[0003] Among them, with the development of smart glasses towards lightweight and wide-angle, wide-angle lenses are also applied to smart glasses. However, in order to meet the miniaturization requirement, the size and spacing of the optical elements inside the wide-angle lens must be compressed, which leads to the problem that the lens is more sensitive to ambient light, and even there is a risk of glare and image blur under the influence of ambient light, which affects the final imaging effect. SUMMARY

[0004] One advantage of the present application is to provide an optical lens which can solve the problem that the wide-angle lens is more sensitive to ambient light after miniaturization.

[0005] The present application provides an optical lens, comprising a lens barrel, a lens group and a plurality of spacer elements contained in the lens barrel; the lens group comprises, in order from the object side to the image side along the optical axis direction: a first lens with negative refractive power, the object side surface of which is a convex surface and the image side surface of which is a concave surface; a second lens with positive refractive power, both the object side surface and the image side surface of which are convex surfaces; a third lens with negative refractive power, the object side surface of which is a convex surface and the image side surface of which is a concave surface; a fourth lens with positive refractive power, both the object side surface and the image side surface of which are convex surfaces; and a fifth lens with negative refractive power, both the object side surface and the image side surface of which are concave surfaces; the plurality of spacer elements comprises a first spacer element placed on the image side of the first lens and in contact with the image side surface of the first lens, a second spacer element placed on the image side of the second lens and in contact with the image side surface of the second lens, a second auxiliary spacer element placed on the image side of the second spacer element and in contact with the image side surface of the second spacer element, a third spacer element placed on the image side of the third lens and in contact with the image side surface of the third lens, and a fourth spacer element placed on the image side of the fourth lens and in contact with the image side surface of the fourth lens; the optical lens satisfies: 1.30 < L / (d0m-d0s) < 2.05; and 5.75 < f2 / (CP2+CP2b) < 9.40;

[0006] Wherein, L is the maximum height of the lens barrel, d0m is the inner diameter of the image side surface of the lens barrel, d0s is the inner diameter of the object side surface of the lens barrel, f2 is the effective focal length of the second lens, CP2 is the maximum thickness of the second spacer element, and CP2b is the maximum thickness of the second auxiliary spacer element.

[0007] In one of the embodiments, the optical lens satisfies: 1.30 < d0m / (f x tan(HFOV)) < 1.85;

[0008] wherein d0m is the inner diameter of the barrel image side, f is the effective focal length of the optical lens, and HFOV is half of the maximum field of view angle of the optical lens.

[0009] In one of the embodiments, the optical lens satisfies: 0.40 < EP12 / (d2s-d1s) < 1.20;

[0010] wherein EP12 is the distance from the image side of the first spacer element to the object side of the second spacer element along the optical axis, d2s is the inner diameter of the object side of the second spacer element, and d1s is the inner diameter of the object side of the first spacer element.

[0011] In one of the embodiments, the optical lens satisfies: 2.20 < EP23 / CT3 < 3.00;

[0012] wherein EP23 is the distance from the image side of the second spacer element to the object side of the third spacer element along the optical axis, and CT3 is the center thickness of the third lens.

[0013] In one of the embodiments, the optical lens satisfies: 2.25 < EP01 / CT1 < 3.70;

[0014] wherein EP01 is the distance from the object side of the barrel to the object side of the first spacer element along the optical axis, and CT1 is the center thickness of the first lens.

[0015] In one of the embodiments, the optical lens satisfies: 1.80 < (T12+CT2) / (CP1+EP12) < 2.65;

[0016] wherein T12 is the air gap of the first lens and the second lens along the optical axis, CT2 is the center thickness of the second lens, CP1 is the maximum thickness of the first spacer element, and EP12 is the distance from the image side of the first spacer element to the object side of the second spacer element along the optical axis.

[0017] In one of the embodiments, the optical lens satisfies: 1.05 < R1 / DT0s < 1.80;

[0018] wherein R1 is the radius of curvature of the object side of the first lens, and DT0s is the minimum inner diameter of the barrel.

[0019] In one of the embodiments, the optical lens satisfies: 1.20 < f / (d0s-d1s) < 2.30;

[0020] wherein f is an effective focal length of the optical lens, d0s is an inner diameter of the object side surface of the lens barrel, and d1s is an inner diameter of the object side surface of the first spacer element.

[0021] In one of the embodiments, the optical lens satisfies: 1.05 < (D2bs-d2bs) / (D2m-d2m) ≤ 1.95.

[0022] wherein D2bs is an outer diameter of the object side surface of the second auxiliary spacer element, d2bs is an inner diameter of the object side surface of the second auxiliary spacer element, D2m is an outer diameter of the image side surface of the second spacer element, and d2m is an inner diameter of the image side surface of the second spacer element.

[0023] In one of the embodiments, the optical lens satisfies: 0.45 < (R4+R5) / d2s < 1.35.

[0024] wherein R4 is a radius of curvature of the image side surface of the second lens, R5 is a radius of curvature of the object side surface of the third lens, and d2s is an inner diameter of the object side surface of the second spacer element.

[0025] In one of the embodiments, the optical lens satisfies: 1.20 < EP34 / (d4s-d3s) < 2.60.

[0026] wherein EP34 is a distance from the image side surface of the third spacer element to the object side surface of the fourth spacer element along the optical axis, d4s is an inner diameter of the object side surface of the fourth spacer element, and d3s is an inner diameter of the object side surface of the third spacer element.

[0027] In one of the embodiments, the optical lens satisfies: 2.85 ≤ (SAG32-SAG41) / CP3 < 8.35.

[0028] wherein SAG32 is an axial displacement between an intersection of the image side surface of the third lens and the optical axis and a vertex of an effective radius of the image side surface of the third lens, SAG41 is an axial displacement between an intersection of the object side surface of the fourth lens and the optical axis and a vertex of an effective radius of the image side surface of the fourth lens, and CP3 is a maximum thickness of the third spacer element.

[0029] In one of the embodiments, the optical lens satisfies: 2.60 ≤ f45 / Tr7r10 ≤ 3.75; and 2.70 < (D4s-d4s) / T45 < 6.50.

[0030] Wherein, Tr7r10 is the axial distance from the object side surface of the fourth lens to the image side surface of the fifth lens, f45 is the combined focal length of the fourth lens and the fifth lens, D4s is the outer diameter of the object side surface of the fourth spacer element, d4s is the inner diameter of the object side surface of the fourth spacer element, and T45 is the air interval of the fourth lens and the fifth lens on the optical axis.

[0031] In one of the embodiments, the optical lens satisfies: 3.85 < DP5 / (T45+CT5) < 5.75.

[0032] Wherein, DP5 is the maximum diameter of the fifth lens, T45 is the air interval of the fourth lens and the fifth lens on the optical axis, and CT5 is the center thickness of the fifth lens.

[0033] In one of the embodiments, the optical lens satisfies: 1.80 < ∑AT / ∑CP < 3.40.

[0034] Wherein, ∑AT is the sum of the air intervals of all adjacent lenses from the first lens to the fifth lens on the optical axis, expressed as ∑AT=T12+T23+T34+T45, and ∑CP is the sum of the maximum thicknesses of all spacer elements and auxiliary spacer elements.

[0035] In one of the embodiments, the optical lens satisfies: 0.60 < R10 / d0m×n5 ≤ 1.70.

[0036] Wherein, R10 is the radius of curvature of the image side surface of the fifth lens, d0m is the inner diameter of the barrel image side surface, and n5 is the refractive index of the fifth lens.

[0037] In summary, the optical lens of the present application can constrain the optical effective aperture size of the object side end of the barrel by satisfying the relationship 1.30 < L / (d0m-d0s) < 2.05, thereby reducing the overall size of the optical lens and meeting the design requirement of miniaturization. However, this constraint can cause the optical lens to be easily affected by reflected stray light generated by the flange position of the lens structure, thereby affecting the imaging quality. In this regard, the present application limits the maximum thicknesses of the second spacer element and the second auxiliary spacer element by the relationship 5.75 < f2 / (CP2+CP2b) < 9.40, effectively suppresses the reflected stray light generated on the inner diameter surface of the image side spacer element after the light passes through the second lens, and reduces the risk of internal stray light of the lens, thereby ensuring the imaging quality of the lens while meeting the miniaturization requirement of the optical lens. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a schematic diagram of the structural parameters of an optical lens according to an embodiment of the present application;

[0039] Figure 2 is a structural diagram of an optical lens according to Embodiment One of the present application;

[0040] Figure 3 is a structural diagram of an optical lens according to Embodiment Two of the present application;

[0041] Figure 4 is a structural diagram of an optical lens according to Embodiment Three of the present application;

[0042] Figure 5A shows an on-axis chromatic aberration curve diagram of the optical lens according to the above Embodiment One, the above Embodiment Two and the above Embodiment Three of the present application;

[0043] Figure 5B shows an astigmatism curve diagram of the optical lens according to the above Embodiment One, the above Embodiment Two and the above Embodiment Three of the present application;

[0044] Figure 5C shows a distortion curve diagram of the optical lens according to the above Embodiment One, the above Embodiment Two and the above Embodiment Three of the present application;

[0045] Figure 5D shows a lateral chromatic aberration curve diagram of the optical lens according to the above Embodiment One, the above Embodiment Two and the above Embodiment Three of the present application;

[0046] Figure 6 is a structural diagram of an optical lens according to Embodiment Four of the present application;

[0047] Figure 7 is a structural diagram of an optical lens according to Embodiment Five of the present application;

[0048] Figure 8 is a structural diagram of an optical lens according to Embodiment Six of the present application;

[0049] Figure 9A shows an on-axis chromatic aberration curve diagram of the optical lens according to the above Embodiment Four, the above Embodiment Five and the above Embodiment Six of the present application;

[0050] Figure 9B shows an astigmatism curve diagram of the optical lens according to the above Embodiment Four, the above Embodiment Five and the above Embodiment Six of the present application;

[0051] Figure 9C shows a distortion curve diagram of the optical lens according to the above Embodiment Four, the above Embodiment Five and the above Embodiment Six of the present application;

[0052] Figure 9DA schematic diagram of the magnification chromatic aberration curves of the optical lenses of Embodiments 4, 5, and 6 according to this application is shown.

[0053] Figure 10 This is a schematic diagram of the structure of an optical lens according to Embodiment Seven of this application;

[0054] Figure 11 This is a schematic diagram of the structure of an optical lens according to Embodiment 8 of this application;

[0055] Figure 12 This is a schematic diagram of the structure of an optical lens according to Embodiment Nine of this application;

[0056] Figure 13A A schematic diagram of the on-axis chromatic aberration curves of the optical lenses of Embodiments 7, 8, and 9 according to this application is shown.

[0057] Figure 13B A schematic diagram of the astigmatism curves of the optical lenses according to Embodiments 7, 8 and 9 of this application is shown.

[0058] Figure 13C A schematic diagram of the distortion curves of the optical lenses according to Embodiments 7, 8 and 9 of this application is shown.

[0059] Figure 13D A schematic diagram of the magnification chromatic aberration curves of the optical lenses of Embodiments 7, 8, and 9 according to this application is shown.

[0060] Figure 14A The stray light pattern of the optical lens is shown when L / (d0m-d0s)=1.40 and f2 / (CP2+CP2b)=6.62;

[0061] Figure 14B The stray light pattern of the optical lens is shown when L / (d0m-d0s)=1.40 and f2 / (CP2+CP2b)=8.81;

[0062] Figure 14C The stray light pattern of the optical lens is shown when L / (d0m-d0s)=1.40 and f2 / (CP2+CP2b)=4.02;

[0063] Figure 14D The stray light pattern of the optical lens is shown when L / (d0m-d0s)=1.40 and f2 / (CP2+CP2b)=12.50. Detailed Implementation

[0064] For a better understanding of the present application, various aspects of the present application will be described in greater detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are merely descriptive of exemplary embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like drawing reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0065] It is to be noted that the expressions first, second, third, and the like, in this specification are used merely to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be referred to as a second lens or a third lens without departing from the teachings of the present application.

[0066] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0067] In this specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The concave-convex judgment of the surface shape in the paraxial region can be made depending on the sign of the R value (R refers to the radius of curvature in the paraxial region). In this specification, the surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens. In terms of the object side surface, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave. In terms of the image side surface, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex.

[0068] It is also to be understood that the use of the terms "including", "including has", "has", "containing", and / or "containing has", when used in this specification, means that there are existence of the stated features, elements and / or components, but does not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of" appear after a list of listed features, it modifies the entire list of features and not the individual elements of the list. Furthermore, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the expression "exemplary" is intended to mean example or illustrative.

[0069] 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 overly literal or overly formal sense unless expressly so defined herein.

[0070] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The following embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0071] The present application provides an optical lens, comprising a lens barrel, a lens set and a plurality of spacer elements accommodated in the lens barrel; the lens set comprises, in order from the object side to the image side along the optical axis direction: a first lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; a second lens with positive refractive power, both the object side surface and the image side surface of which are convex; a third lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; a fourth lens with positive refractive power, both the object side surface and the image side surface of which are convex; and a fifth lens with negative refractive power, both the object side surface and the image side surface of which are concave; the plurality of spacer elements comprises a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens, a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens, a second auxiliary spacer element disposed on the image side of the second spacer element and in contact with the image side surface of the second spacer element, a third spacer element disposed on the image side of the third lens and in contact with the image side surface of the third lens, and a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens.

[0072] In particular, the optical lens satisfies:

[0073] 1.30 < L / (d0m - d0s) < 2.05; and

[0074] 5.75 < f2 / (CP2 + CP2b) < 9.40;

[0075] Wherein, L is the maximum height of the lens barrel, d0m is the image side inner diameter of the lens barrel, d0s is the object side inner diameter of the lens barrel, f2 is the effective focal length of the second lens, CP2 is the maximum thickness of the second spacer element, CP2b is the maximum thickness of the second auxiliary spacer element.

[0076] It is worth noting that in this application, by satisfying the relationship 1.30 < L / (d0m-d0s) <2.05, the optical effective clear aperture size of the object side end of the lens barrel can be constrained, thereby reducing the overall size of the optical lens and meeting the design requirement of miniaturization. However, this constraint can cause the optical lens to be easily affected by reflected stray light generated by the spacer element (i.e. the flange position of the lens structure), thereby affecting the imaging quality. In this regard, by the relationship 5.75 < f2 / (CP2+CP2b) <9.40, the maximum thickness of the second spacer element and the second auxiliary spacer element is limited, effectively suppressing the reflected stray light generated on the image side spacer element inner diameter surface of the second lens after the light passes through the second lens, reducing the risk of internal stray light of the lens, thereby ensuring the imaging quality of the lens under the premise of meeting the miniaturization requirement of the optical lens.

[0077] Exemplarily, Figure 14A The stray light spot diagram of the optical lens when satisfying L / (d0m-d0s)=1.40 and f2 / (CP2+CP2b)=6.62 is shown; Figure 14B The stray light spot diagram of the optical lens when satisfying L / (d0m-d0s)=1.40 and f2 / (CP2+CP2b)=8.81 is shown; Figure 14C The stray light spot diagram of the optical lens when satisfying L / (d0m-d0s)=1.40 and f2 / (CP2+CP2b)=4.02 is shown; Figure 14D The stray light spot diagram of the optical lens when satisfying L / (d0m-d0s)=1.40 and f2 / (CP2+CP2b)=12.50 is shown. As can be seen from the figure, Figure 14A and Figure 14B When 1.30 < L / (d0m-d0s) <2.05 and 5.75 < f2 / (CP2+CP2b) <9.40 are satisfied, the stray light path through the second lens is significantly reduced, and the imaging is clear; as shown in Figure 14C When 1.30 < L / (d0m-d0s) <2.05 and f2 / (CP2+CP2b) <5.75, f2 is a positive focal power that can converge light, and when the light passes through the second lens, the thickness of the second spacer element and the second auxiliary spacer element is too large, and the reflected stray light with strong energy is generated on the second spacer element inner diameter surface after the light passes through the second lens. In the actual shooting, the pinhole stray light at the edge of the light source is easily appeared on the image plane, which affects the imaging quality of the lens; as shown in Figure 14DAs shown, when 1.30 < L / (d0m-d0s) < 2.05, f2 / (CP2+CP2b) > 9.40, the second spacing element and the second auxiliary spacing element are relatively thin, the spacing element is prone to deformation and bending after assembly and baking, greatly increasing the risk of light leakage of the radial position of the lens structure, and ultimately producing a stray light spot with relatively strong energy.

[0078] Preferably, 1.32 ≤ L / (d0m-d0s) ≤ 2.04; and 5.76 ≤ f2 / (CP2+CP2b) ≤ 9.38.

[0079] According to some embodiments of the present application, the optical lens satisfies: 1.30 < d0m / (f x tan(HFOV)) < 1.85; wherein d0m is the barrel image side inner diameter, f is the effective focal length of the optical lens, and HFOV is half of the maximum field of view angle of the optical lens.

[0080] In this way, by limiting 1.30 < d0m / (f x tan(HFOV)) < 1.85, the relationship between the barrel image side inner diameter, the effective focal length of the optical system, and the half field of view angle can be effectively coordinated, ensuring that the lens size meets the chip imaging size requirements, and under the premise of strictly controlling the overall radial size of the lens and the total height of the lens, the optical performance of the lens for large field of view angle imaging is met.

[0081] Preferably, 1.33 ≤ d0m / (f x tan(HFOV)) ≤ 1.81.

[0082] According to some embodiments of the present application, the optical lens satisfies: 0.40 < EP12 / (d2s-d1s) ≤ 1.20; wherein EP12 is the distance from the image side of the first spacing element to the object side of the second spacing element along the optical axis, d2s is the object side inner diameter of the second spacing element, and d1s is the object side inner diameter of the first spacing element.

[0083] In this way, by limiting 0.40 < EP12 / (d2s-d1s) ≤ 1.20, the effective light incident range after the light passes through the first spacing element can be accurately controlled, and the converging effect of the light by the second lens is coordinated. This limitation constrains the thickness of the edge of the second lens on the one hand, and strengthens the interception efficiency of the stray light path at the effective diameter edge position of the second lens on the other hand; at the same time, by comprehensively regulating the ratio of the distance and the inner diameter difference of the spacing element, the light propagation path length through the second lens is optimized, causing the stray light path at the effective diameter edge position of the second lens to reflect multiple times at the second lens flange position, thereby achieving the purpose of eliminating stray light.

[0084] Preferably, 0.42 ≤ EP12 / (d2s-d1s) ≤ 1.20.

[0085] According to some embodiments of the present application, the optical lens satisfies: 2.20 < EP23 / CT3 < 3.00; wherein EP23 is the distance along the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element, and CT3 is the center thickness of the third lens.

[0086] In this way, the restriction of the above relationship can cooperatively constrain the edge thickness and the center thickness of the third lens by limiting the ratio of the axial distance from the image side surface of the second spacer element to the object side surface of the third spacer element to the center thickness of the third lens, thereby optimizing the structural shape design of the third lens. This not only helps to ensure the structural stability and forming process feasibility of the third lens, but also effectively reduces the risk of weld marks in the effective optical zone during the manufacturing process.

[0087] Preferably, 2.24 ≤ EP23 / CT3 ≤ 2.99.

[0088] According to some embodiments of the present application, the optical lens satisfies: 2.25 < EP01 / CT1 < 3.70; wherein EP01 is the distance along the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element, and CT1 is the center thickness of the first lens.

[0089] In this way, since the object side surface of the first lens is convex, by limiting 2.25 < EP01 / CT1 < 3.70, the ratio relationship of the edge thickness and the barrel front end wall thickness to the center thickness of the first lens can be constrained. This constraint not only ensures that the first lens has good forming process feasibility, but also prevents the object side convex surface of the first lens from excessively exceeding the object side end surface of the lens barrel, thereby facilitating the assembly of subsequent lens groups, effectively reducing the risk of lens bruising during the assembly process, and improving the production yield.

[0090] Preferably, 2.27 ≤ EP01 / CT1 ≤ 3.69.

[0091] According to some embodiments of the present application, the optical lens satisfies: 1.80 < (T12+CT2) / (CP1+EP12) ≤ 2.65;

[0092] wherein T12 is the air gap of the first lens and the second lens along the optical axis, CT2 is the center thickness of the second lens, CP1 is the maximum thickness of the first spacer element, and EP12 is the distance along the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element.

[0093] In this way, by limiting the range of the combination parameter (T12+CT2) / (CP1+EP12), on the one hand, the second lens edge can have a reasonable thickness, the manufacturing process feasibility can be ensured, the axial space distribution of the second lens area can be optimized, the lens further miniaturization creation can be controlled, and the assembly stability can be improved; on the other hand, it is beneficial to control the cooperation mode of the first lens and the second lens, and the uniformity and controllability of the spacing element and the lens spacing are reserved through the relationship limit, so that the imaging stability of the object side end of the lens can be improved, and the overall stray light performance of the optical lens can be improved.

[0094] Preferably, 1.82≤(T12+CT2) / (CP1+EP12)≤2.65.

[0095] According to some embodiments of the present application, the optical lens satisfies: 1.05

[0096] In this way, the ratio of the curvature of the object side surface of the first lens and the minimum inner diameter of the lens barrel can be limited through the above relationship; the constraint not only ensures the compactness of the structure size of the object side end of the lens to adapt to the space limitation requirement of the whole machine, but also improves the stray light, which is beneficial to realize the uniformity of the spacing element and the lens spacing, realize the imaging stability of the object side end of the lens, and improve the overall stray light quality of the optical imaging system.

[0097] Preferably, 1.08≤R1 / DT0s≤1.79.

[0098] According to some embodiments of the present application, the optical lens satisfies: 1.20

[0099] In this way, by limiting 1.20

[0100] Preferably, 1.21≤f / (d0s-d1s) ≤2.29.

[0101] According to some embodiments of the present application, the optical lens satisfies: 1.05 < (D2bs-d2bs) / (D2m-d2m) ≤ 1.95; wherein D2bs is the outer diameter of the object side surface of the second auxiliary spacer element, d2bs is the inner diameter of the object side surface of the second auxiliary spacer element, D2m is the outer diameter of the image side surface of the second spacer element, and d2m is the inner diameter of the image side surface of the second spacer element.

[0102] In this way, by limiting the relationship, the radial structural stability of the second spacer element can be optimized. Specifically, by limiting the size ratio of the end surface of the auxiliary spacer element to the second spacer element, the deflection deformation degree of the second spacer element during lens baking and standing is significantly inhibited, the risk of optical axis deviation and stray light escape caused by deflection is avoided, and the effective length of the second lens and the auxiliary spacer element is ensured, so that the mechanical stability of the lens is improved.

[0103] Preferably, 1.06 ≤ (D2bs-d2bs) / (D2m-d2m) ≤ 1.95.

[0104] According to some embodiments of the present application, the optical lens satisfies: 0.45 < (R4+R5) / d2s < 1.35; wherein R4 is the radius of curvature of the image side surface of the second lens, R5 is the radius of curvature of the object side surface of the third lens, and d2s is the inner diameter of the object side surface of the second spacer element.

[0105] In this way, since the image side surface of the second lens and the object side surface of the third lens are both convex, the optical coupling characteristics of the convex image side surface of the second lens and the convex object side surface of the third lens can be precisely controlled by limiting the relationship, so that the transmission path of the light in the air gap between the second lens and the third lens is limited, the light converges through the image side surface of the second lens and then appropriately diverges through the object side surface of the third lens, and the stray light path at the flange position of the second lens is effectively intercepted, so that the ghost image with large energy is avoided and the clarity of the lens imaging is ensured.

[0106] Preferably, 0.48 ≤ (R4+R5) / d2s ≤ 1.33.

[0107] According to some embodiments of the present application, the optical lens satisfies: 1.20 < EP34 / (d4s-d3s) < 2.60; wherein EP34 is the distance from the image side surface of the third spacer element to the object side surface of the fourth spacer element along the optical axis, d4s is the inner diameter of the object side surface of the fourth spacer element, and d3s is the inner diameter of the object side surface of the third spacer element.

[0108] In this way, by controlling the above relationship within a reasonable range, the matching relationship between the axial spacing and the inner diameter difference of the third spacer element and the fourth spacer element can be regulated, so that the performance stability of the lens before and after the high temperature and high humidity reliability test is ensured.

[0109] Preferably, 1.24≤EP34 / (d4s-d3s) ≤2.59.

[0110] According to some embodiments of the present application, the optical lens satisfies: 2.85≤(SAG32-SAG41) / CP3<8.35; wherein SAG32 is the axial displacement between the intersection of the third lens image side surface and the optical axis and the effective radius vertex of the third lens image side surface, SAG41 is the axial displacement between the intersection of the fourth lens object side surface and the optical axis and the effective radius vertex of the fourth lens image side surface, and CP3 is the maximum thickness of the third spacer element.

[0111] In this way, by restricting the range of the above relationship, the matching relationship between the axial spacing and the inner diameter difference of the third spacer element and the fourth spacer element can be regulated, so that the performance stability of the lens before and after the high temperature and high humidity reliability test is ensured.

[0112] Preferably, 2.85≤(SAG32-SAG41) / CP3≤8.34.

[0113] According to some embodiments of the present application, the optical lens satisfies: 2.60≤f45 / Tr7r10≤3.75; and 2.70<(D4s-d4s) / T45<6.50; wherein Tr7r10 is the axial distance from the fourth lens object side surface to the fifth lens image side surface, f45 is the combined focal length of the fourth lens and the fifth lens, D4s is the outer diameter of the fourth spacer element object side surface, d4s is the inner diameter of the fourth spacer element object side surface, and T45 is the air gap of the fourth lens and the fifth lens on the optical axis.

[0114] In this way, by limiting 2.60≤f45 / Tr7r10≤3.75, the lens can be miniaturized while ensuring that the exiting light of the lens meets the chip image height, but this optical layout is prone to cause relatively serious stray light at the effective diameter edge of the fourth lens image side surface and the flange position of the fifth lens; for this, by further limiting 2.70<(D4s-d4s) / T45<6.50 in the present application, the internal light path is cooperatively regulated by the structural size of the fourth spacer element and the air gap between the fourth lens and the fifth lens, so that the reflection path of the stray light is improved while part of the stray light path is intercepted, and the stray light is finally emitted outside the image plane, so as to ensure the imaging quality of the lens.

[0115] Preferably, 2.60≤f45 / Tr7r10≤3.75; and 2.74≤(D4s-d4s) / T45≤6.48.

[0116] According to some embodiments of the present application, the optical lens satisfies: 3.85 < DP5 / (T45+CT5) < 5.75; wherein, DP5 is the maximum diameter of the fifth lens, T45 is the air gap of the fourth lens and the fifth lens on the optical axis, and CT5 is the center thickness of the fifth lens.

[0117] In this way, in the present application, for the characteristics of the fifth lens as the last piece of lens of the lens group and the largest diameter, by limiting the above relationship, the structure appearance of the fifth lens can be controlled to balance the structural stability of the rear section of the lens and the miniaturization of the lens, thereby providing adaptive protection for the light and thin and reliability requirements of application scenarios such as optical glasses.

[0118] Preferably, 3.88≤DP5 / (T45+CT5) ≤5.73.

[0119] According to some embodiments of the present application, the optical lens satisfies: 1.80 < ∑AT / ∑CP < 3.40; wherein, ∑AT is the sum of the air gaps of all adjacent lenses from the first lens to the fifth lens on the optical axis, expressed as ∑AT=T12+T23+T34+T45, and ∑CP is the sum of the maximum thicknesses of all spacer elements and auxiliary spacer elements.

[0120] In this way, by limiting the sum of the air gap thickness and the sum of the spacer element thickness by the above relationship, the optical sensitivity of the lens when subjected to the axial fitting force can be minimized, thereby ensuring the performance stability of the lens before and after the reliability test; specifically, by limiting the above relationship, the sum of the air gap thickness and the sum of the spacer element thickness form a reasonable ratio, thereby making the distribution of the air gap on the optical axis relatively uniform, and the relatively uniform air gap can achieve the purpose of improving the axial direction lens thickness and air gap sensitivity.

[0121] Preferably, 1.82≤∑AT / ∑CP≤3.38.

[0122] According to some embodiments of the present application, the optical lens satisfies: 0.60 < R10 / d0m x n5 ≤ 1.70; wherein, R10 is the curvature radius of the image side surface of the fifth lens, d0m is the image side inner diameter of the lens barrel, and n5 is the refractive index of the fifth lens.

[0123] Thus, since the image side surface of the fifth lens is concave, the emergent light rays pass through the object side surface of the fifth lens is divergent, therefore, by limiting the curvature radius of the object side surface of the fifth lens, the refractive index of the material and the inner diameter of the barrel object side surface, the emergent angle of the emergent light rays can be limited, on the one hand, the risk of ghost image generated by the image side surface of the fifth lens can be reduced, on the other hand, the risk of reflection stray light generated by the inner side wall surface of the barrel close to the image side of the lens can also be reduced, so that the imaging of the lens is more clear and stable, and the imaging quality of the lens is ensured.

[0124] Preferably, 0.61≤R10 / d0m×n5≤1.70.

[0125] It should be noted that those skilled in the art should understand that the number of intermediate spacing elements constituting the optical lens can be changed without departing from the technical solutions claimed in the present application, to obtain the various results and advantages described in the present specification, which are not specifically limited by the present application. For example, the optical lens can also include other numbers of intermediate spacing elements different from those described in the above embodiments as needed.

[0126] Some specific but non-limiting examples of the above embodiments of the present application will be described in more detail below with reference to the accompanying drawings. For ease of description, in the following examples, OBJ represents the object plane of the optical lens (not shown in the drawings), STO represents the aperture (not shown in the drawings), S1 represents the object side surface of the first lens E1, S2 represents the image side surface of the first lens E1, S3 represents the object side surface of the second lens E2, S4 represents the image side surface of the second lens E2, S5 represents the object side surface of the third lens E3, S6 represents the image side surface of the third lens E3, S7 represents the object side surface of the fourth lens E4, S8 represents the image side surface of the fourth lens E4, S9 represents the object side surface of the fifth lens E5, S10 represents the image side surface of the fifth lens E5, S11 represents the object side surface of the optical filter or protective glass, S12 represents the image side surface of the optical filter or protective glass, S13 represents the imaging plane of the optical lens (S11, S12, S13 as shown in the drawings, and the remaining drawings are omitted). Figure 2

[0127] Example One

[0128] As Figure 2 ​As shown, in this embodiment, the optical lens comprises a lens barrel P0, and a lens group and a plurality of spacer elements accommodated in the lens barrel P0; the lens group comprises, in order from the object side to the image side along the optical axis direction, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5; the plurality of spacer elements comprises a first spacer element P1 arranged on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 arranged on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer element P3 arranged on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, and a fourth spacer element P4 arranged on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4.

[0129] In this embodiment, the plurality of spacer elements further comprises a second auxiliary spacer element P2b arranged between the second lens E2 and the third lens E3 and in contact with the image side surface of the second spacer element P2.

[0130] In this embodiment, the optical lens further comprises an aperture stop STO located on the object side of the first lens E1 along the optical axis direction.

[0131] In this embodiment, the first lens E1 has a negative refractive power, the object side surface S1 and the image side surface S2 of the first lens E1 are convex and concave respectively; the second lens E2 has a positive refractive power, the object side surface S3 and the image side surface S4 of the second lens E2 are both convex; the third lens E3 has a negative refractive power, the object side surface S5 and the image side surface S6 of the third lens E3 are convex and concave respectively; the fourth lens E4 has a positive refractive power, the object side surface S7 and the image side surface S8 of the fourth lens E4 are both convex; the fifth lens E5 has a negative refractive power, the object side surface S9 and the image side surface S10 of the fifth lens E5 are both concave.

[0132] In addition, Table 1 shows the basic optical parameters of the optical lens of Embodiment 1, wherein the units of the curvature radius and the thickness / distance are millimeters (mm).

[0133] Table 1: Basic optical parameter table of the optical lens of Embodiment 1

[0134]

[0135] In this embodiment, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces, and the aspherical surface of each aspherical surface is defined by the following aspherical surface formula: which can be defined by, but is not limited to, the following aspherical surface formula:

[0136] (Formula 1)

[0137] in, Let be the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical mirrors S1 to S10 in Example 1.

[0138] Table 2: Aspherical Higher-Order Coefficients of the Optical Lens in Example 1

[0139]

[0140] Example 2

[0141] like Figure 3 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, in sequence from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5; the plurality of spacer elements include a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer element P3 located on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, and a fourth spacer element P4 located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4.

[0142] In this embodiment, the plurality of spacers further includes a second auxiliary spacer element P2b disposed between the second lens E2 and the third lens E3 and in contact with the image side of the second spacer element P2.

[0143] In this embodiment, the optical lens also includes an aperture STO, which is located on the object side of the first lens E1 along the optical axis.

[0144] It is worth noting that, compared with the above-mentioned embodiment one, the optical lens of this embodiment two has the same optical parameters, i.e., the basic optical parameter table of the optical lens of this embodiment two is the same as Table 1, and the aspherical high-order term coefficient table is the same as Table 2. While the optical lens of this embodiment two and the optical lens of the above-mentioned embodiment one have different structure parameters, i.e., the difference between this embodiment two and the above-mentioned embodiment one lies in that the size values of part of the structure parameters in the optical lens are different. Specifically, the values of each relevant structure parameter in this embodiment two are shown in Table 8 below, respectively. It can be understood that the units of the values of each parameter shown in Table 8 are millimeters (mm), and the schematic of each parameter in the structure diagram of the optical lens is shown in Figure 1 .

[0145] Embodiment three

[0146] As shown in Figure 4 , in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a plurality of spacer elements contained in the lens barrel P0; the lens group includes, in order from the object side to the image side along the optical axis direction: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5; the spacer elements include a first spacer element P1 disposed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 disposed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer element P3 disposed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, and a fourth spacer element P4 disposed on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4.

[0147] In this embodiment, the plurality of spacer elements further include a second auxiliary spacer element P2b disposed between the second lens E2 and the third lens E3 and in contact with the image side surface of the second spacer element P2.

[0148] In this embodiment, the optical lens further includes an aperture STO, which is located on the object side of the first lens E1 along the optical axis direction.

[0149] It is worth noting that, compared with the above-mentioned embodiment one, the optical lens of this embodiment three has the same optical parameters, i.e., the basic optical parameter table of the optical lens of this embodiment three is the same as Table 1, and the aspherical high-order term coefficient table is the same as Table 2. While the optical lens of this embodiment three and the optical lens of the above-mentioned embodiment one have different structure parameters, i.e., the difference between this embodiment three and the above-mentioned embodiment one lies in that the size values of part of the structure parameters in the optical lens are different. Specifically, the values of each relevant structure parameter in this embodiment three are shown in Table 8 below, respectively. The on-axis chromatic aberration curves of the optical lenses in the embodiment one, the embodiment two, and the embodiment three are shown in Figure 5AAs shown, this represents the degree of deviation of the focal point after light of different wavelengths passes through the optical lens; the astigmatism curves of the optical lenses in Embodiments 1, 2, and 3 are shown below. Figure 5B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical lenses in Embodiments 1, 2, and 3 are as follows. Figure 5C As shown, it represents the type and size of lens distortion; the magnification chromatic aberration curves of the optical lenses in Embodiments 1, 2, and 3 are as follows. Figure 5D As shown, this represents the chromatic aberration performance of the lens. According to... Figure 5A Figure 5B , Figure 5C as well as Figure 5D It can be seen that the optical lenses in Embodiment 1, Embodiment 2 and Embodiment 3 can all achieve good imaging quality.

[0150] Example 4

[0151] like Figure 6 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, in sequence from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5; the plurality of spacer elements include a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer element P3 located on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, and a fourth spacer element P4 located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4.

[0152] In this embodiment, the plurality of spacers further includes a second auxiliary spacer element P2b disposed between the second lens E2 and the third lens E3 and in contact with the image side of the second spacer element P2.

[0153] In this embodiment, the optical lens further includes an aperture STO, which is located between the first lens E1 and the second lens E2 along the optical axis.

[0154] In this embodiment, the first lens E1 has negative optical power, and the object-side surface S1 and image-side surface S2 of the first lens E1 are convex and concave, respectively; the second lens E2 has positive optical power, and the object-side surface S3 and image-side surface S4 of the second lens E2 are both convex; the third lens E3 has negative optical power, and the object-side surface S5 and image-side surface S6 of the third lens E3 are both convex and concave, respectively; the fourth lens E4 has positive optical power, and the object-side surface S7 and image-side surface S8 of the fourth lens E4 are both convex; the fifth lens E5 has negative optical power, and the object-side surface S9 and image-side surface S10 of the fifth lens E5 are both concave.

[0155] In addition, Table 3 shows the basic optical parameters of the optical lens of Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0156] Table 3: Basic optical parameters of the optical lens in Example 4

[0157]

[0158] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces, and the surface shape of each aspherical surface can be defined by the aspherical surface formula (Formula 1) described above. Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S1 to S10 in Embodiment 4.

[0159] Table 4: Aspherical Higher-Order Coefficients of the Optical Lens in Example 4

[0160]

[0161] Example 5

[0162] like Figure 7 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, in sequence from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5; the plurality of spacer elements include a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer element P3 located on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, and a fourth spacer element P4 located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4.

[0163] In this embodiment, the plurality of spacers further includes a second auxiliary spacer element P2b disposed between the second lens E2 and the third lens E3 and in contact with the image side of the second spacer element P2.

[0164] In this embodiment, the optical lens further includes an aperture STO, which is located between the first lens E1 and the second lens E2 along the optical axis.

[0165] It is worth noting that, compared with Embodiment 4 above, the optical lens of Embodiment 5 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 5 is the same as Table 3, and the aspherical higher-order term coefficient table is the same as Table 4. However, the optical lens of Embodiment 5 has different structural parameters than the optical lens of Embodiment 4 above, that is, the difference between Embodiment 5 and Embodiment 4 above is that the dimensional values ​​of some structural parameters in the optical lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 5 are shown in Table 8 below.

[0166] Example 6

[0167] like Figure 8 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, in sequence from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5; the plurality of spacer elements include a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer element P3 located on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, and a fourth spacer element P4 located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4.

[0168] In this embodiment, the plurality of spacers further includes a second auxiliary spacer element P2b disposed between the second lens E2 and the third lens E3 and in contact with the image side of the second spacer element P2.

[0169] In this embodiment, the optical lens further includes an aperture STO, which is located between the first lens E1 and the second lens E2 along the optical axis.

[0170] It is worth noting that the optical lens of this embodiment six has the same optical parameters compared with the above-mentioned embodiment four, i.e. the basic optical parameter table of the optical lens of this embodiment six is the same as table 3, and the aspheric high order term coefficient table is the same as table 4. However, the optical lens of this embodiment six has different structure parameters compared with the optical lens of the above-mentioned embodiment four, i.e. the difference between this embodiment six and the above-mentioned embodiment four lies in that the size values of some structure parameters in the optical lens are different.

[0171] Specifically, the values of each relevant structure parameter in this embodiment six are shown in table 8 below. The on-axis chromatic aberration curves of the optical lens in embodiment four, embodiment five and embodiment six are shown in Figure 9A , which represent the convergence focus deviation of light rays with different wavelengths after passing through the optical lens; the astigmatism curves of the optical lens in embodiment four, embodiment five and embodiment six are shown in Figure 9B , which represent the meridional image surface curvature and sagittal image surface curvature; the distortion curves of the optical lens in embodiment four, embodiment five and embodiment six are shown in Figure 9C , which represent the distortion type and size of the lens; the rate of change curves of the optical lens in embodiment four, embodiment five and embodiment six are shown in Figure 9D , which represent the chromatic aberration performance of the lens. According to Figure 9A , Figure 9B , Figure 9C and Figure 9D , it can be known that the optical lens in embodiment four, embodiment five and embodiment six can all achieve good imaging quality.

[0172] Embodiment seven

[0173] As shown in Figure 10 , in this embodiment, the optical lens comprises a lens barrel P0 and a lens group and a plurality of spacer elements contained in the lens barrel P0; the lens group comprises, in order from the object side to the image side along the optical axis direction: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5; the plurality of spacer elements comprises a first spacer element P1 disposed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 disposed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer element P3 disposed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, and a fourth spacer element P4 disposed on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4.

[0174] In this embodiment, the plurality of spacer elements further comprises a second auxiliary spacer element P2b disposed between the second lens E2 and the third lens E3 and in contact with the image side surface of the second spacer element P2.

[0175] In this embodiment, the optical lens further comprises a stop STO, which is located between the first lens E1 and the second lens E2 along the optical axis direction.

[0176] In this embodiment, the first lens E1 has negative refractive power, the object side S1 and the image side S2 of the first lens E1 are convex and concave respectively; the second lens E2 has positive refractive power, the object side S3 and the image side S4 of the second lens E2 are both convex; the third lens E3 has negative refractive power, the object side S5 and the image side S6 of the third lens E3 are convex and concave respectively; the fourth lens E4 has positive refractive power, the object side S7 and the image side S8 of the fourth lens E4 are both convex; the fifth lens E5 has negative refractive power, the object side S9 and the image side S10 of the fifth lens E5 are both concave.

[0177] In addition, Table 5 shows the basic optical parameters of the optical lens of embodiment seven, wherein the units of the curvature radius, thickness / distance are all millimeters (mm).

[0178] Table 5: Basic optical parameter table of the optical lens of embodiment seven

[0179]

[0180] In this embodiment, the object side and the image side of any one of the first lens E1 to the fifth lens E5 are all aspheric surfaces, and the surface type of each aspheric surface can be defined by the above-mentioned aspheric surface formula (formula 1). Table 6 below gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 of the aspheric surfaces S1 to S10 which can be used in embodiment seven.

[0181] Table 6: Aspheric surface high-order term coefficient table of the optical lens of embodiment seven

[0182]

[0183] Embodiment eight

[0184] As Figure 11As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, in sequence from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5; the plurality of spacer elements include a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer element P3 located on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, and a fourth spacer element P4 located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4.

[0185] In this embodiment, the plurality of spacers further includes a second auxiliary spacer element P2b disposed between the second lens E2 and the third lens E3 and in contact with the image side of the second spacer element P2.

[0186] In this embodiment, the optical lens further includes an aperture STO, which is located between the first lens E1 and the second lens E2 along the optical axis.

[0187] It is worth noting that, compared with Embodiment Seven above, the optical lens of Embodiment Eight has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment Eight is the same as Table 5, and the aspherical higher-order term coefficient table is the same as Table 6. However, the optical lens of Embodiment Eight has different structural parameters from the optical lens of Embodiment Seven above, that is, the difference between Embodiment Eight and Embodiment Seven is that the dimensional values ​​of some structural parameters in the optical lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment Eight are shown in Table 8 below.

[0188] Example 9

[0189] like Figure 12 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, in sequence from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5; the plurality of spacer elements include a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer element P3 located on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, and a fourth spacer element P4 located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4.

[0190] In this embodiment, the plurality of spacer elements further comprises a second auxiliary spacer element P2b disposed between the second lens E2 and the third lens E3 and in contact with the image side surface of the second spacer element P2.

[0191] In this embodiment, the optical lens further comprises a stop STO located between the first lens E1 and the second lens E2 along the optical axis.

[0192] It is worth noting that, compared with the above-mentioned embodiment seven, the optical lens of this embodiment nine has the same optical parameters, i.e., the basic optical parameter table of the optical lens of this embodiment nine is the same as table 5, and the aspherical high-order term coefficient table is the same as table 6. While the optical lens of this embodiment nine and the optical lens of the above-mentioned embodiment seven have different structure parameters, i.e., the difference between this embodiment nine and the above-mentioned embodiment seven is that the size values of part of the structure parameters in the optical lens are different.

[0193] Specifically, the values of each related structure parameter in this embodiment nine are shown in table 8 below. The on-axis chromatic aberration curves of the optical lens in embodiment seven, embodiment eight and embodiment nine are shown in Figure 13A , which represent the convergence focus deviation of light rays of different wavelengths after passing through the optical lens; the astigmatism curves of the optical lens in embodiment seven, embodiment eight and embodiment nine are shown in Figure 13B , which represent the meridional image surface curvature and sagittal image surface curvature; the distortion curves of the optical lens in embodiment seven, embodiment eight and embodiment nine are shown in Figure 13C , which represent the distortion type and size of the lens; the rate of change curves of the optical lens in embodiment seven, embodiment eight and embodiment nine are shown in Figure 13D , which represent the chromatic aberration performance of the lens. According to Figure 13A , Figure 13B , Figure 13C and Figure 13D , it can be known that the optical lens in embodiment seven, embodiment eight and embodiment nine can all achieve good imaging quality.

[0194] In summary, in embodiment one to embodiment nine, the optical parameters of the optical lens are shown in table 7 below.

[0195] Table 7: Optical parameter table of optical lens

[0196]

[0197] In addition, the structure parameters of the optical lens in embodiment one to embodiment nine are shown in table 8 below. The unit of each structure parameter is millimeter (mm).

[0198] Table 8: Structure parameter table of optical lens

[0199]

[0200] In summary, the optical lenses in Embodiment 1 to Embodiment 9 satisfy the relationship shown in Table 9, as shown in Table 9.

[0201] Table 9: Relationship table of optical lenses

[0202]

[0203] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered as falling within the scope of the present disclosure.

[0204] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all fall within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An optical lens characterized in that: The optical lens includes a lens barrel, a lens group accommodated in the lens barrel, and a plurality of spacer elements. The optical lens satisfies: 1.30 < L / (d0m-d0s) < 2.05; and 5.75 < f2 / (CP2+CP2b) < 9.40; wherein L is a maximum height of the lens barrel, d0m is an inner diameter of an image-side surface of the lens barrel, d0s is an inner diameter of an object-side surface of the lens barrel, f2 is an effective focal length of the second lens, CP2 is a maximum thickness of the second spacer element, and CP2b is a maximum thickness of the second auxiliary spacer element. The optical lens satisfies: 1.30 < d0m / (f*tan(HFOV)) < 1.85; wherein d0m is the inner diameter of the image-side surface of the lens barrel, f is an effective focal length of the optical lens, and HFOV is half of a maximum field of view angle of the optical lens.

2. The optical lens of claim 1, wherein, The optical lens satisfies: 0.40 < EP12 / (d2s-d1s) ≤ 1.20; wherein EP12 is a distance along an optical axis direction from an image-side surface of the first spacer element to an object-side surface of the second spacer element, d2s is an inner diameter of the object-side surface of the second spacer element, and d1s is an inner diameter of the object-side surface of the first spacer element. The optical lens satisfies: 2.20 < EP23 / CT3 < 3.00; wherein EP23 is a distance along the optical axis direction from an image-side surface of the second spacer element to an object-side surface of the third spacer element, and CT3 is a center thickness of the third lens.

3. The optical lens of claim 1, wherein, The optical lens satisfies: 2.25 < EP01 / CT1 < 3.70; wherein EP01 is a distance along the optical axis direction from the object-side surface of the lens barrel to the object-side surface of the first spacer element, and CT1 is a center thickness of the first lens. The optical lens satisfies: 1.80 < (T12+CT2) / (CP1+EP12) ≤ 2.65; 4. The optical lens of claim 1, wherein, ​ ​ 5. The optical lens of claim 1, wherein, ​ ​ 6. The optical lens of claim 1, wherein, ​ Wherein, T12 is the air interval of the first lens and the second lens on the optical axis, CT2 is the center thickness of the second lens, CP1 is the maximum thickness of the first spacer element, EP12 is the distance from the image side surface of the first spacer element to the object side surface of the second spacer element along the optical axis direction.

7. The optical lens of claim 1, wherein, The optical lens satisfies: 1.05 < R1 / DT0s < 1.80; Wherein, R1 is the curvature radius of the object side surface of the first lens, DT0s is the minimum inner diameter of the lens barrel.

8. The optical lens of claim 1, wherein, The optical lens satisfies: 1.20 < f / (d0s-d1s) < 2.30; Wherein, f is the effective focal length of the optical lens, d0s is the object side surface inner diameter of the lens barrel, d1s is the object side surface inner diameter of the first spacer element.

9. The optical lens of claim 1, wherein, The optical lens satisfies: 1.05 < (D2bs-d2bs) / (D2m-d2m) ≤ 1.95; Wherein, D2bs is the object side surface outer diameter of the second auxiliary spacer element, d2bs is the object side surface inner diameter of the second auxiliary spacer element, D2m is the image side surface outer diameter of the second spacer element, d2m is the image side surface inner diameter of the second spacer element.

10. The optical lens of claim 1, wherein, The optical lens satisfies: 0.45 < (R4+R5) / d2s < 1.35; Wherein, R4 is the curvature radius of the image side surface of the second lens, R5 is the curvature radius of the object side surface of the third lens, d2s is the object side surface inner diameter of the second spacer element.

11. The optical lens of claim 1, wherein, The optical lens satisfies: 1.20 < EP34 / (d4s-d3s) < 2.60; Wherein, EP34 is the distance from the image side surface of the third spacer element to the object side surface of the fourth spacer element along the optical axis direction, d4s is the object side surface inner diameter of the fourth spacer element, d3s is the object side surface inner diameter of the third spacer element.

12. The optical lens of claim 1, wherein, The optical lens satisfies: 2.85 ≤ (SAG32-SAG41) / CP3 < 8.35; Wherein, SAG32 is the axial displacement between the intersection of the image side surface of the third lens and the optical axis and the effective radius vertex of the image side surface of the third lens, SAG41 is the axial displacement between the intersection of the object side surface of the fourth lens and the optical axis and the effective radius vertex of the image side surface of the fourth lens, CP3 is the maximum thickness of the third spacer element.

13. The optical lens of claim 1, wherein, The optical lens satisfies: 2.60 ≤ f45 / Tr7r10 ≤ 3.75; and 2.70 < (D4s-d4s) / T45 < 6.50; Wherein, Tr7r10 is the on-axis distance from the object side surface of the fourth lens to the image side surface of the fifth lens, f45 is the combined focal length of the fourth lens and the fifth lens, D4s is the object side surface outer diameter of the fourth spacer element, d4s is the object side surface inner diameter of the fourth spacer element, T45 is the air interval of the fourth lens and the fifth lens on the optical axis.

14. The optical lens of claim 1, wherein, The optical lens satisfies: 3.85 < DP5 / (T45+CT5) < 5.75; Wherein, DP5 is the maximum diameter of the fifth lens, T45 is the air interval of the fourth lens and the fifth lens on the optical axis, CT5 is the center thickness of the fifth lens.

15. The optical lens of claim 1, wherein, The optical lens satisfies: 1.80 < ∑AT / ∑CP < 3.40; Wherein, ∑AT is the sum of air gaps of all adjacent lenses from the first lens to the fifth lens on the optical axis, expressed as ∑AT=T12+T23+T34+T45, ∑CP is the sum of the maximum thicknesses of all spacer elements and auxiliary spacer elements in the spacer elements.

16. The optical lens of claim 1, wherein, The optical lens satisfies: 0.60 < R10 / d0m×n5 ≤ 1.70; Wherein, R10 is the curvature radius of the image side surface of the fifth lens, d0m is the inner diameter of the image side surface of the lens barrel, and n5 is the refractive index of the fifth lens.

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