Optical lens

Abstract

The embodiment of the utility model discloses an optical lens, which comprises a lens barrel with an accommodating space, and a lens group and at least one spacing element which are accommodated in the lens barrel, the lens group comprises a first lens with positive focal power, a second lens with focal power, a third lens with focal power, a fourth lens with focal power, a fifth lens with focal power and a sixth lens with focal power which are sequentially arranged from the object side to the image side along the optical axis; the at least one spacer element includes a first spacer element located between the first lens and the second lens and in direct contact with the image side of the first lens; the effective focal length f1 of the first lens and the outer diameter D1s of the object side face of the first spacing element meet the condition that f1 / D1s is larger than 23.0 and smaller than 167.0. The radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, the Abbe number V1 of the first lens, and the inner diameter d1s of the object side surface of the first spacer element satisfy: 25.0 < (R1 + R2) * V1 / d1s < 56.0.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and in particular, to an optical lens comprising multiple lenses. Background Art

[0002] Nowadays, optical lenses are widely used in feature recognition electronic terminal devices, with the characteristics of non-contact, lightweight, and all-weather operation. Such lenses have high requirements for the recognition of details of the objects being photographed, such as no vignetting system, high RI (relative illumination) value, and ensuring no dark corners at the edges.

[0003] Therefore, in order to meet the demand for detail recognition of the object being photographed, it is necessary to design an optical lens that can take into account both high resolution and high relative illumination. Utility Model Content

[0004] According to one aspect of the present application, an optical lens is provided, which includes a lens barrel with a containing space, and a lens group and at least one spacer element contained in the lens barrel, wherein the lens group includes: a first lens with positive optical power, a second lens with optical power, a third lens with optical power, a fourth lens with optical power, a fifth lens with optical power, and a sixth lens with optical power, which are arranged in sequence from the object side to the image side along the optical axis; the at least one spacer element includes a first spacer element located between the first lens and the second lens and directly in contact with the image side of the first lens; wherein the effective focal length f1 of the first lens and the outer diameter D1s of the object side surface of the first spacer element satisfy: 23.0<f1 / D1s<167.0; and the curvature radius R1 of the object side surface of the first lens, the curvature radius R2 of the image side surface of the first lens, the Abbe number V1 of the first lens, and the inner diameter d1s of the object side surface of the first spacer element satisfy: 25.0<(R1+R2)*V1 / d1s<56.0.

[0005] In one or more embodiments, the interval EP01 between the front end surface of the lens barrel and the first spacing element, the air interval T12 between the first lens and the second lens on the optical axis, and the center thickness CT1 of the first lens on the optical axis satisfy: 3.0<(EP01+T12) / CT1<4.5.

[0006] In one or more embodiments, the effective focal length f2 of the second lens, the curvature radius R3 of the object side surface of the second lens, and the inner diameter d1m of the image side surface of the first spacing element satisfy: 1.0 mm -1 <f2 / R3 / d1m<2.5mm -1 .

[0007] In one or more embodiments, at least one spacer element also includes a second spacer element located between the second lens and the third lens and in direct contact with the image side of the second lens, and the combined focal length f12 of the first lens and the second lens and the outer diameter D2m of the image side surface of the second spacer element satisfy: 1.5<f12 / D2m<3.0.

[0008] In one or more embodiments, at least one spacer element also includes a second spacer element located between the second lens and the third lens and in direct contact with the image side of the second lens, and a third spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third lens. The effective focal length f3 of the third lens, the air gap T34 between the third lens and the fourth lens on the optical axis, the gap EP23 between the second spacer element and the third spacer element, and the center thickness CT3 of the third lens on the optical axis satisfy: 1.8mm<f3*T34 / (EP23+CT3)<7.0mm.

[0009] In one or more embodiments, at least one spacer element also includes a second spacer element located between the second lens and the third lens and in direct contact with the image side of the second lens, a third spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third lens, and a fourth spacer element located between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens. The center thickness CT3 of the third lens on the optical axis, the interval EP23 between the second spacer element and the third spacer element, the center thickness CT4 of the fourth lens on the optical axis, and the interval EP34 between the third spacer element and the fourth spacer element satisfy: 1.0<CT3*EP23 / (CT4*EP34)<1.6.

[0010] In one or more embodiments, at least one spacer element also includes a second spacer element located between the second lens and the third lens and in direct contact with the image side of the second lens, and the inner diameter d2s of the object side of the second spacer element, the inner diameter d2m of the image side of the second spacer element, the refractive index N2 of the second lens, and the maximum thickness CP2 of the second spacer element satisfy: 3.0<(d2s-d2m)*N2 / CP2<3.5.

[0011] In one or more embodiments, at least one spacer element also includes a third spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third lens, and a fourth spacer element located between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens. The outer diameter D3s of the object side surface of the third spacer element, the air gap T34 between the third lens and the fourth lens on the optical axis, and the curvature radius R5 of the object side surface of the third lens satisfy: 0.0mm<D3s*T34 / R5<0.5mm.

[0012] In one or more embodiments, at least one spacer element also includes a fourth spacer element located between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens, and an inner diameter d4s of the object side surface of the fourth spacer element, a curvature radius R7 of the object side surface of the fourth lens, a curvature radius R8 of the image side surface of the fourth lens, and an inner diameter d4m of the image side surface of the fourth spacer element satisfy: 1.5<d4s / R7+d4m / R8<2.0.

[0013] In one or more embodiments, at least one spacer element also includes a fifth spacer element located between the fifth lens and the sixth lens and in direct contact with the image side of the fifth lens, the effective focal length f5 of the fifth lens, the maximum thickness CP5 of the fifth spacer element, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 29.0<f5 / (CP5+T45)<67.0.

[0014] In one or more embodiments, at least one spacer element also includes a fourth spacer element located between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and in direct contact with the image side of the fifth lens. The combined focal length f45 of the fourth lens and the fifth lens and the interval EP45 between the fourth spacer element and the fifth spacer element satisfy: 5.0<f45 / EP45<11.0.

[0015] In one or more embodiments, at least one spacer element also includes a fifth spacer element located between the fifth lens and the sixth lens and in direct contact with the image side of the fifth lens, and the effective focal length f6 of the sixth lens, the Abbe number V6 of the sixth lens, and the outer diameter D5m of the image side surface of the fifth spacer element satisfy: -43.0<f6*V6 / D5m<-27.0.

[0016] In one or more embodiments, the first lens has positive optical power, the second lens has positive optical power, the third lens has positive optical power, the fifth lens has positive optical power, and the sixth lens has negative optical power.

[0017] The optical lens provided in the present application adopts a six-piece lens group. By reasonably setting the number of lenses with optical power in the lens group and the combination design of high and low refractive index materials of each lens, the lens has small field curvature, low dispersion and high RI value. However, it also causes the first lens to be more sensitive, and the structural area is prone to stray light, which affects the imaging quality. By satisfying 23.0<f1 / D1s<167.0 and 25.0<(R1+R2)*V1 / d1s<56.0, it is beneficial to improve the field curvature, astigmatism and chromatic aberration correction of the optical structure, and realize the design of small field curvature, low astigmatism and small chromatic aberration of the lens. At the same time, the appropriate aperture ensures high imaging resolution and increases the ability of terminal electronic devices to identify details; it is also beneficial to ensure that there is no dark corner at the edge while achieving a high RI value, reduce the sensitivity of the first lens, make it have good processability performance, and improve the stray light in the first lens structure area, thereby improving the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 A schematic diagram showing the structure and some parameters of an optical lens according to an embodiment of the present application is shown;

[0020] Figure 2 A schematic structural diagram of an optical lens according to Embodiment 1 of the present application is shown;

[0021] Figure 3 A schematic structural diagram of an optical lens according to Embodiment 2 of the present application is shown;

[0022] FIG. 4A to FIG. 4C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical lens according to Example 1 and Example 2 of the present application are respectively shown;

[0023] Figure 5 A schematic structural diagram of an optical lens according to Embodiment 3 of the present application is shown;

[0024] Figure 6 A schematic structural diagram of an optical lens according to Embodiment 4 of the present application is shown;

[0025] 7A to 7C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical lens according to Example 3 and Example 4 of the present application are respectively shown;

[0026] Figure 8 A schematic structural diagram of an optical lens according to Embodiment 5 of the present application is shown;

[0027] Fig. 9A schematic structural diagram of an optical lens according to Embodiment 6 of the present application is shown;

[0028] FIG. 10A to FIG. 10C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical lens according to Example 5 and Example 6 of the present application are respectively shown;

[0029] Fig.11A and Fig. 11B The defocus curve and relative illumination curve of the optical lens sample 1 are shown respectively;

[0030] Fig. 12A and Fig. 12B The defocus curve and relative illumination curve of the sample 2 of the optical lens are shown respectively;

[0031] Fig.13A and Fig. 13B The defocus curve and relative illumination curve of the optical lens sample 3 are shown respectively. DETAILED DESCRIPTION

[0032] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0034] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0035] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0036] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do 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, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0037] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The following embodiments only express several implementation methods of the present application, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, which all belong to the protection scope of the present application. For example, the lens groups (i.e., the first lens to the sixth lens), the lens barrel structure and the spacing elements in the embodiments of the present application can be arbitrarily combined, and are not limited to the lens group in one embodiment can only be combined with the lens barrel structure, spacing elements, etc. of the embodiment.

[0039] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. Figure 1 The structure arrangement diagram of an optical lens according to the present application and a schematic diagram of some parameters are shown. It should be understood by those skilled in the art that some parameters commonly used in the art, such as the center thickness CT1 of the first lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, etc., are not shown in the figure. Figure 1 It is shown in Figure 1 Only some parameters of the lens barrel and the spacer element of an optical lens of the present application are shown as examples to facilitate a better understanding of the present invention. Figure 1As shown, EP01 represents the spacing between the front end surface of the lens barrel close to the object side and the object side surface of the first spacing element along the optical axis; EP23 represents the spacing between the image side surface of the second spacing element and the object side surface of the third spacing element along the optical axis; EP34 represents the spacing between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis; EP45 represents the spacing between the image side surface of the fourth spacing element and the object side surface of the fifth spacing element along the optical axis; CP2 represents the maximum thickness of the second spacing element along the optical axis; CP5 represents the maximum thickness of the fifth spacing element along the optical axis; D1s represents the outer diameter of the object side surface of the first spacing element; d1s represents the inner diameter of the object side surface of the first spacing element; D1m represents the outer diameter of the image side surface of the first spacing element; d1m represents the inner diameter of the image side surface of the first spacing element; D2s represents the outer diameter of the object side surface of the second spacing element; d2s represents the inner diameter of the object side surface of the second spacing element; D2m represents the outer diameter of the image side surface of the second spacing element; d2m represents the inner diameter of the image side surface of the second spacing element, and so on.

[0040] The features, principles and other aspects of the present application are described in detail below.

[0041] refer to Figure 2 and Figure 3 As shown, the first aspect of the present application provides such an optical lens, which may include a lens barrel, a lens group and at least one spacing element, wherein the lens group and the one or more spacing elements are all accommodated in the lens barrel. The lens group may include six lenses with optical power, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side along the optical axis. Any two adjacent lenses from the first lens to the sixth lens may have a spacing distance between them.

[0042] In an exemplary embodiment, the first lens may have positive power. The second lens may have positive power. The third lens may have positive power. The fourth lens may have positive power or negative power. The fifth lens may have positive power. The sixth lens may have negative power.

[0043] In an exemplary embodiment, the lens group may include at least one edged lens. The outer peripheral surface of the edged lens may have an edged portion and a non-edged portion, and the outer diameter of the edged portion of the lens is smaller than the outer diameter of the non-edged portion of the lens. When the outer peripheral surface of the lens has an edged portion, the outer diameter of the lens generally refers to the outer diameter of the non-edged portion of the lens.

[0044] It should be understood that the surface of each optical element (such as lens, spacer element) closest to the object is called the object side surface of the optical element, and the surface of each optical element closest to the imaging surface is called the image side surface of the optical element. The surface of the lens barrel closest to the object is called the object side end surface or the front end surface of the lens barrel, and the surface of the lens barrel closest to the imaging surface is called the image side end surface or the rear end surface of the lens barrel.

[0045] The optical lens according to an exemplary embodiment of the present application includes at least one spacer element, for example, it may include any one or more of the following spacer elements: a first spacer element located between the first lens and the second lens and in direct contact with the image side of the first lens, a second spacer element located between the second lens and the third lens and in direct contact with the image side of the second lens, a third spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third lens, a fourth spacer element located between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens, a fifth spacer element located between the fifth lens and the sixth lens and in direct contact with the image side of the fifth lens, and a sixth spacer element located on the image side of the sixth lens and in direct contact with the image side of the sixth lens, etc.

[0046] In an exemplary embodiment, at least one spacer element may further include an auxiliary spacer element or a secondary auxiliary spacer element, for example: a third auxiliary spacer element, located between the third lens and the fourth lens, the object side of the third auxiliary spacer element is in direct contact with the image side of the third spacer element; a third secondary auxiliary spacer element, located between the third lens and the fourth lens, the object side of the third secondary auxiliary element is in direct contact with the image side of the third auxiliary spacer element; a fifth auxiliary spacer element, located between the fifth lens and the sixth lens, the object side of the fifth auxiliary spacer element is in direct contact with the image side of the fifth spacer element. Exemplarily, the spacer element, the auxiliary spacer element or the secondary auxiliary spacer element may include a spacer, a light shielding sheet, a spacer ring or a pressure ring, etc. By reasonably setting the number, thickness, inner diameter and outer diameter of the spacer element, it is helpful to block stray light, improve the imaging quality of the optical lens, and improve the assembly stability of the optical lens.

[0047] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: 23.0<f1 / D1s<167.0; 25.0<(R1+R2)*V1 / d1s<56.0, wherein f1 is the effective focal length of the first lens, D1s is the outer diameter of the object side surface of the first spacer element, d1s is the inner diameter of the object side surface of the first spacer element, R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, and V1 is the Abbe number of the first lens. In order to offset the field curvature of the system and improve the imaging capability of the lens, the effective focal length of the first lens and the outer diameter of the object side of the first spacing element are controlled, thereby controlling the exit angle of the edge field light in the system, which is beneficial to improving the system RI value. However, this also makes the first lens more sensitive and has a higher risk of stray light. By controlling the optical lens within the range of 23.0<f1 / D1s<167.0 and 25.0<(R1+R2)*V1 / d1s<56.0, it is beneficial to reduce the stray light generated by the edge light entering the mechanism part of the lens, thereby effectively reducing the stray light energy and ensuring the imaging quality of the optical lens.

[0048] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: 3.0<(EP01+T12) / CT1<4.5, wherein T12 is the air interval between the first lens and the second lens on the optical axis, EP01 is the interval between the front end face of the lens barrel and the first spacing element, and CT1 is the center thickness of the first lens on the optical axis. By satisfying this conditional formula, by controlling the ratio of the sum of the air interval between the first lens and the second lens on the optical axis and the distance between the front end face of the lens barrel and the first spacing element to the center thickness of the first lens on the optical axis, the distance between the object side surface of the first lens and the front end face of the lens barrel on the optical axis can be ensured, thereby controlling the total length of the lens barrel, ensuring that there is no risk of protrusion of the object side surface of the first lens after the lens is assembled, and at the same time ensuring that there is sufficient bearing space between the first lens and the second lens, thereby improving the stability of system assembly.

[0049] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: 1.0 mm -1 <f2 / R3 / d1m<2.5mm -1 , where d1m is the inner diameter of the image side surface of the first spacing element, f2 is the effective focal length of the second lens, and R3 is the curvature radius of the object side surface of the second lens. By satisfying this conditional formula, by controlling the ratio of the effective focal length of the second lens to the curvature radius of the object side surface of the second lens and the inner diameter of the image side surface of the first spacing element, the non-imaging light can be effectively blocked from passing through, and the RI at the edge of the field of view can be increased while meeting the design requirements, thereby improving the overall imaging quality of the lens.

[0050] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: 1.5<f12 / D2m<3.0, wherein f12 is the combined focal length of the first lens and the second lens, and D2m is the outer diameter of the image side surface of the second spacing element. By satisfying this conditional formula, by controlling the ratio of the combined focal length of the first lens and the second lens to the outer diameter of the image side surface of the second spacing element, the outer diameter gradient change of the lens group composed of the first lens and the second lens and the rear lens group is controlled, and poor assembly stability caused by excessive outer diameter gradient is avoided, which is conducive to ensuring stable performance of the lens.

[0051] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: 1.8mm<f3*T34 / (EP23+CT3)<7.0mm, wherein f3 is the effective focal length of the third lens, T34 is the air spacing between the third lens and the fourth lens on the optical axis, EP23 is the spacing between the second spacing element and the third spacing element, and CT3 is the center thickness of the third lens on the optical axis. By satisfying this conditional formula, by controlling the ratio of the product of the effective focal length of the third lens and the air spacing between the third lens and the fourth lens on the optical axis to the sum of the spacing between the second spacing element and the third spacing element and the center thickness of the third lens, the maximum value of the thickness of the third lens can be controlled to ensure the overall uniformity of the lens thickness variation and avoid abnormal molding of a single component due to excessive thickness variation; at the same time, the influence of assembly instability caused by the step difference structure between the third lens and the fourth lens is reduced.

[0052] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: 1.0<CT3*EP23 / (CT4*EP34)<1.6, wherein CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, EP23 is the interval between the second spacing element and the third spacing element, and EP34 is the interval between the third spacing element and the fourth spacing element. By satisfying this conditional formula, by controlling the ratio of the product of the center thickness of the third lens and the interval between the second spacing element and the third spacing element, and the product of the center thickness of the fourth lens and the interval between the third spacing element and the fourth spacing element, the purpose of controlling the ratio of the edge thickness to the middle thickness of the third lens and the fourth lens is achieved, so that the overall thickness change of the third lens and the fourth lens is smoother, the molding risk is reduced, and the assembly stability of the third lens and the fourth lens is improved, thereby improving the assembly stability and imaging quality of the optical lens; at the same time, the field curvature sensitivity of the air gap here is made more reasonable, and the field curvature adjustment is made more controllable.

[0053] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: 3.0<(d2s-d2m)*N2 / CP2<3.5, wherein d2s is the inner diameter of the object side surface of the second spacer element, d2m is the inner diameter of the image side surface of the second spacer element, N2 is the refractive index of the second lens, and CP2 is the maximum thickness of the second spacer element. By satisfying this conditional formula, by controlling the ratio of the product of the inner diameter difference between the object side surface and the image side surface of the second spacer element and the refractive index of the first lens to the maximum thickness of the second spacer element, the main light rays incident on and emitted from the second lens can be within a reasonable angle range, and the risk of stray light can be effectively reduced, thereby improving the imaging quality of the lens.

[0054] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: 0.0mm<D3s*T34 / R5<0.5mm, wherein D3s is the outer diameter of the object side surface of the third spacer element, T34 is the air space between the third lens and the fourth lens on the optical axis, and R5 is the radius of curvature of the object side surface of the third lens. By satisfying this conditional formula, by controlling the ratio of the product of the air space between the third lens and the fourth lens and the outer diameter of the object side surface of the third spacer element to the radius of curvature of the object side surface of the third lens, the purpose of controlling the gradient transition of the inner diameter of the third lens and the fourth lens in the lens barrel is achieved, the stability of the assembly is improved, and the stability of the lens field curvature is ensured.

[0055] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: 1.5<d4s / R7+d4m / R8<2.0, wherein R7 is the radius of curvature of the object side surface of the fourth lens, R8 is the radius of curvature of the image side surface of the fourth lens, d4s is the inner diameter of the object side surface of the fourth spacing element, and d4m is the inner diameter of the image side surface of the fourth spacing element. When this conditional formula is satisfied, by controlling the sum of the ratio of the inner diameter of the object side surface of the fourth spacing element to the radius of curvature of the object side surface of the fourth lens and the ratio of the inner diameter of the image side surface of the fourth spacing element to the radius of curvature of the image side surface of the fourth lens, while controlling the overall shape of the fourth lens, by adjusting the direction of the light, the light flux of the optical system can be ensured, thereby achieving the purpose of controlling the stray light generated by the fourth lens when incident in different wavelength bands.

[0056] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: 29.0<f5 / (CP5+T45)<67.0, wherein f5 is the effective focal length of the fifth lens, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, and CP5 is the maximum thickness of the fifth spacing element. By satisfying this conditional formula, the purpose of controlling the thickness of the lens structure position when the fifth lens and the sixth lens are assembled is achieved by controlling the ratio of the effective focal length of the fifth lens to the sum of the air gap between the fourth lens and the fifth lens on the optical axis and the maximum thickness of the fifth spacing element. Since the image side of the fifth lens and the object side of the sixth lens are very small at the edge of the effective diameter, under the premise of ensuring the uniform thickness of the single component, the risk of interference between the fifth lens and the sixth lens due to assembly deformation is avoided by increasing the thickness of the assembly position, thereby reducing sensitivity.

[0057] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: 5.0<f45 / EP45<11.0, wherein f45 is the combined focal length of the fourth lens and the fifth lens, and EP45 is the interval between the fourth spacing element and the fifth spacing element. By satisfying this conditional formula, the thickness of the fifth lens at the assembly position is controlled by controlling the ratio of the combined focal length of the fourth lens and the fifth lens to the interval between the fourth spacing element and the fifth spacing element, and the overall thickness ratio of the fifth lens is controlled to ensure the stability of the lens after molding, reduce the risk of weld marks, and improve the yield of a single component.

[0058] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: -43.0<f6*V6 / D5m<-27.0, wherein f6 is the effective focal length of the sixth lens, V6 is the Abbe number of the sixth lens, and D5m is the outer diameter of the image side surface of the fifth spacing element. When the conditional formula is satisfied, the outer diameter difference between the fifth lens and the sixth lens is reduced by controlling the ratio of the product of the effective focal length of the sixth lens and the Abbe number to the outer diameter of the image side surface of the fifth spacing element, so that the change in the size of the inner diameter of the rear end of the lens barrel is more uniform, thereby ensuring the stability of the lens assembly and facilitating the miniaturization of the lens as a whole.

[0059] The second aspect of the present application provides such an optical lens, which may include a lens barrel, a lens group and at least one spacer element, wherein the lens group and the one or more spacer elements are all contained in the lens barrel. The lens group may include six lenses with optical power, which are respectively a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side along the optical axis. The first lens to the fifth lens may have positive optical power, and the sixth lens may have negative optical power. For example, at least one spacer element may include a first spacer element between the first lens and the second lens, and the first spacer element may contact the non-optical area of ​​the image side of the first lens, and illustratively, it may abut against the non-optical area of ​​the image side of the first lens.

[0060] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: 1.0 mm -1 <f2 / R3 / d1m<2.5mm -1 , where d1m is the inner diameter of the image side surface of the first spacer element, f2 is the effective focal length of the second lens, and R3 is the curvature radius of the object side surface of the second lens. By satisfying this conditional formula, by controlling the ratio of the inner diameter of the image side surface of the first spacer element to the curvature radius of the object side surface of the second lens and the effective focal length of the second lens, it is possible to effectively block the passage of non-imaging light, and on the premise of meeting the design requirements, improve the RI at the edge of the field of view and improve the overall imaging quality of the lens.

[0061] The third aspect of the present application provides such an optical lens, which may include a lens barrel, a lens group and at least one spacer element, wherein the lens group and the one or more spacer elements are all contained in the lens barrel. The lens group may include six lenses with optical power, which are respectively a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side along the optical axis. The first lens to the fifth lens may have positive optical power, and the sixth lens may have negative optical power. For example, at least one spacer element may include a second spacer element located between the second lens and the third lens, and the second spacer element may contact the non-optical area of ​​the image side of the second lens, and illustratively, it may abut against the non-optical area of ​​the image side of the second lens.

[0062] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditional formula: 3.0<(d2s-d2m)*N2 / CP2<3.5, wherein d2s is the inner diameter of the object side surface of the second spacer element, d2m is the inner diameter of the image side surface of the second spacer element, N2 is the refractive index of the second lens, and CP2 is the maximum thickness of the second spacer element. By satisfying this conditional formula, by controlling the ratio of the product of the inner diameter difference between the object side surface and the image side surface of the second spacer element and the refractive index of the first lens to the maximum thickness of the second spacer element, the main light rays incident on and emitted from the second lens can be within a reasonable angle range, and the risk of stray light can be effectively reduced, thereby improving the imaging quality of the lens.

[0063] It should be understood that the present application does not specifically limit the number of spacer elements, and any number of spacer elements may be included between any two lenses, and the entire optical lens may also include any number of spacer elements. The spacer element helps the optical lens intercept excess refractive and reflective light paths and reduce stray light and ghosting. Adding auxiliary support between the spacer element and the lens barrel is helpful to improve the problems of poor assembly stability and low performance yield caused by large step differences between lenses.

[0064] In some embodiments, the optical lens according to the present application may further include a filter and / or protective glass disposed between the sixth lens and the imaging surface, for filtering light with different wavelengths, correcting color deviation, and protecting the photosensitive element located on the imaging surface.

[0065] In some embodiments, the optical lens according to the present application may further include an aperture disposed between the object side and the first lens. The provision of the aperture is conducive to effectively converging the light entering the optical lens and is conducive to reducing the aperture of the lens.

[0066] According to the optical lens of the above embodiment of the present application, its lens group can use multiple lenses, such as the six lenses described above. By reasonably allocating the focal length, surface shape, center thickness of each lens, and the on-axis spacing between each lens, etc., the incident light can be effectively converged, the total optical length can be reduced, and the processability can be improved, making the optical lens more conducive to production and processing.

[0067] In an embodiment of the present application, at least one of the mirror surfaces of each lens in the first lens to the sixth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side surface and the image side surface of each lens in the first lens to the sixth lens are aspherical mirror surfaces.

[0068] Embodiments 1 to 6 of the optical lens applicable to the above exemplary embodiment will be further described below with reference to the accompanying drawings.

[0069] Example 1

[0070] The following reference Figure 2 An optical lens according to Example 1 of the present application is described.

[0071] like Figure 2 As shown, the optical lens comprises a lens barrel, a lens group and at least one spacer element accommodated in the lens barrel.

[0072] The lens group includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0073] The at least one spacer element includes: a first spacer element P1, a second spacer element P2, a third spacer element P3, a third auxiliary spacer element P3b, a third auxiliary spacer element P3c, a fourth spacer element P4 and a fifth spacer element P5. The spacer element can block stray light from entering the next lens during the imaging process, and at the same time make the lens and the lens barrel better supported, thereby enhancing the structural stability of the optical lens.

[0074] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The optical lens also includes a filter (not shown) arranged between the sixth lens E6 and the imaging surface S15. The filter has an object side surface S13 (not shown) and an image side surface S14 (not shown). The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0075] Table 1 shows the basic parameters of the optical lens of Example 1, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0076]

[0077] Table 1

[0078] In Example 1, the object side surface and the image side surface of any lens among the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0079]

[0080] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Tables 2-1 and 2-2 give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A22 , A 24 , A 26 , A 28 and A 30 .

[0081] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.2616E-02 -2.8861E-03 -6.7000E-04 5.9355E-05 -1.5401E-05 1.8251E-05 -5.1959E-06 S2 -1.7111E-01 -8.0816E-03 -5.4779E-04 6.9656E-04 2.1507E-04 6.9932E-05 3.2420E-05 S3 -1.7980E-01 -3.2468E-03 4.4996E-03 2.6773E-03 4.8765E-04 -7.4915E-05 -1.7870E-04 S4 -1.4136E-01 1.5108E-03 4.8060E-03 2.3405E-03 1.2186E-03 6.9983E-04 2.2519E-04 S5 -2.0356E-01 5.7804E-03 8.6646E-03 3.5662E-03 1.9931E-03 6.4625E-04 -3.8267E-04 S6 -3.3382E-01 1.8909E-02 9.7576E-03 4.4379E-03 2.9574E-03 1.2740E-03 -5.6765E-05 S7 -4.7585E-01 -9.7097E-02 -7.1871E-03 1.3925E-02 5.2128E-03 4.3069E-04 -1.7573E-03 S8 -6.7974E-01 -2.6233E-03 -2.9647E-02 1.5427E-02 1.5093E-02 2.4765E-03 4.2876E-04 S9 -9.8146E-01 2.5670E-02 6.1940E-02 -4.2042E-02 3.2041E-02 -5.1156E-04 -5.3103E-03 S10 -2.8246E-01 -1.4354E-01 6.3190E-02 -4.6720E-02 2.4279E-02 -8.1245E-03 9.7334E-03 S11 -1.0442E+00 3.6657E-01 -1.6556E-01 7.8167E-02 -2.3328E-02 -3.3708E-03 1.1144E-02 S12 -2.5645E+00 5.9305E-01 -1.9911E-01 5.9806E-02 -2.0774E-02 5.1434E-03 9.3143E-04

[0082] Table 2-1

[0083] Face number A18 A20 A22 A24 A26 A28 A30 S1 5.2799E-06 -5.0061E-06 7.8947E-08 -6.5430E-06 9.8500E-07 -3.1534E-07 2.6423E-06 S2 -1.7051E-06 -4.3579E-07 -1.3089E-05 -6.0304E-06 -7.6803E-06 1.1375E-06 -2.3741E-07 S3 -1.1859E-04 -4.4766E-05 2.5232E-05 4.3457E-05 4.0100E-05 1.8892E-05 8.5728E-06 S4 -5.1320E-05 -1.2078E-04 -9.2412E-05 -4.6917E-05 -2.0731E-05 -1.1969E-05 -8.0549E-06 S5 -5.6185E-04 -3.6089E-04 -8.9893E-05 3.8957E-05 6.9276E-05 3.9319E-05 1.5988E-05 S6 -4.3711E-04 -4.8568E-04 -3.7688E-04 -2.3503E-04 -1.2991E-04 -5.4350E-05 -1.8730E-05 S7 -2.4391E-04 3.1100E-04 -1.0421E-04 -3.6148E-05 1.1348E-04 1.3927E-04 4.4446E-05 S8 -3.1706E-03 3.6899E-04 -8.5545E-04 5.0410E-04 -9.8803E-04 -8.4748E-04 -5.1312E-04 S9 -5.0821E-03 4.1361E-03 -3.0993E-04 3.8514E-04 -6.3163E-04 -7.6873E-04 -6.5340E-04 S10 -4.0499E-03 -1.1726E-03 -6.7564E-04 1.6238E-03 8.2787E-04 4.7698E-04 2.9269E-04 S11 -4.0358E-03 -7.1616E-04 8.3170E-04 2.0957E-04 4.7176E-04 4.6148E-04 1.2977E-04 S12 2.9323E-03 -2.2281E-04 -1.6056E-03 -2.0003E-03 -1.2676E-03 -5.6754E-04 -1.2963E-04

[0084] Table 2-2

[0085] Figure 4A The axial chromatic aberration curve of the optical lens of Example 1 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 4B The astigmatism curve of the optical lens of Example 1 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 4C The magnification chromatic aberration curve of the optical lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 4A to FIG. 4C It can be seen that the optical lens provided in Example 1 can achieve good imaging quality.

[0086] Example 2

[0087] The following reference Figure 3 The optical lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.

[0088] like Figure 3 As shown, the optical lens comprises a lens barrel, a lens group and at least one spacer element contained in the lens barrel. The lens group comprises, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The at least one spacer element comprises: a first spacer element P1, a second spacer element P2, a third spacer element P3, a third auxiliary spacer element P3b, a third auxiliary spacer element P3c, a fourth spacer element P4, and a fifth spacer element P5.

[0089] The parameters such as the radius of curvature, center thickness, and spacing distances between lenses and high-order coefficients of the optical lens of this embodiment and embodiment 1 are the same, as shown in Table 1, Table 2-1, and Table 2-2. In addition, the number of spacing elements included in the optical lens of this embodiment and embodiment 1 is also the same, and the only difference is that the actual parameters of the lens barrel and each spacing element are different, for example, at least one of the parameters such as the lens barrel size, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, and the spacing distance between the spacing elements is different. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens of embodiment 2 of the present application is as follows: FIG. 4A to FIG. 4C shown.

[0090] Example 3

[0091] The following reference Figure 5 Describe the optical lens according to Example 3 of the present application.

[0092] like Figure 5 As shown, the optical lens comprises a lens barrel, a lens group and at least one spacer element contained in the lens barrel. The lens group comprises, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The spacer element comprises a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6.

[0093] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The optical lens also includes a filter (not shown) arranged between the sixth lens E6 and the imaging surface S15.

[0094] Table 3 shows the basic parameter table of the optical lens of Example 3, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0095]

[0096]

[0097] Table 3

[0098] In Example 3, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by the formula (1) given in the above Example 1. The following Tables 4-1 and 4-2 give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0099] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.0486E-02 -2.1338E-03 -2.2221E-04 -2.3722E-04 1.7939E-04 -1.0934E-04 8.1440E-05 S2 -1.4031E-01 -3.7496E-03 -1.6912E-03 6.9661E-04 1.3954E-04 1.2775E-04 1.8942E-05 S3 -1.5541E-01 -7.3624E-03 2.1096E-03 2.9298E-03 9.6628E-04 1.9645E-04 -5.5518E-05 S4 -1.2130E-01 -5.7286E-03 4.5210E-03 1.8208E-03 -5.9799E-05 -2.7732E-04 6.7911E-05 S5 -1.8585E-01 5.9579E-03 1.2206E-02 2.1197E-03 -1.9826E-03 -1.6835E-03 -3.4946E-04 S6 -3.4114E-01 1.6993E-02 2.0951E-02 6.8003E-03 2.4567E-04 -1.0348E-03 -1.0763E-03 S7 -3.4181E-01 -1.0918E-01 -7.7382E-03 1.2190E-02 2.9301E-03 2.2611E-03 -1.5309E-04 S8 -5.2561E-01 -3.1733E-02 -3.1629E-02 1.7011E-02 1.0012E-02 5.2006E-03 -6.3378E-04 S9 -6.6829E-01 3.9494E-02 3.3829E-02 -3.7324E-02 2.9716E-02 2.5180E-03 -6.8976E-03 S10 -3.7406E-01 -1.5683E-01 7.6353E-02 -5.8065E-02 2.6158E-02 -1.3114E-03 1.9521E-03 S11 -1.0719E+00 3.7821E-01 -1.6062E-01 5.4262E-02 -1.2658E-02 3.7344E-03 -1.2742E-03 S12 -2.6167E+00 6.1352E-01 -1.5862E-01 3.9596E-02 -1.5394E-02 6.9158E-03 -5.5753E-03

[0100] Table 4-1

[0101] Face number A18 A20 A22 A24 A26 A28 A30 S1 -4.6804E-05 3.5806E-05 -2.4264E-05 1.6919E-05 -1.0955E-05 1.2683E-05 -1.1653E-05 S2 2.6430E-05 -8.3471E-06 1.9798E-06 -1.6150E-05 -5.4196E-06 -1.3613E-05 6.7467E-07 S3 -6.1301E-05 -6.9192E-05 -4.2468E-05 -2.6720E-05 -2.1639E-07 4.6196E-06 7.1752E-06 S4 9.9115E-05 6.7676E-05 -1.0887E-05 -1.2494E-05 -2.0478E-05 -6.6441E-06 -3.8943E-06 S5 1.3941E-04 9.4194E-05 -5.2819E-05 -6.3365E-05 -2.8535E-05 4.5002E-06 4.8589E-06 S6 -3.3592E-04 -1.4382E-05 9.7693E-05 4.9009E-05 1.5822E-05 2.4624E-06 -3.0382E-06 S7 1.2451E-04 -1.3341E-04 1.4709E-05 -5.2279E-05 -8.9611E-06 -2.9577E-05 1.0610E-05 S8 -2.2740E-03 -2.5917E-04 -3.0585E-04 5.9367E-06 9.1020E-05 7.7017E-05 2.7777E-05 S9 -1.9956E-03 1.7654E-03 -2.6875E-04 -1.8672E-04 1.6623E-04 8.1962E-05 -3.2984E-05 S10 1.8818E-04 -2.5202E-04 2.9653E-06 -3.4786E-04 -7.0656E-05 -8.6058E-05 -3.7449E-05 S11 2.6660E-04 3.6428E-05 3.6245E-04 -2.2603E-04 1.0470E-04 7.3864E-05 1.3976E-04 S12 2.6312E-03 -8.4105E-04 2.8179E-04 1.5961E-04 5.3512E-04 -9.9388E-05 -1.0720E-05

[0102] Table 4-2

[0103] Fig. 7A The axial chromatic aberration curve of the optical lens of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 7B The astigmatism curve of the optical lens of Example 3 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 7C The magnification chromatic aberration curve of the optical lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 7A to 7C It can be seen that the optical lens provided in Example 3 can achieve good imaging quality.

[0104] Example 4

[0105] The following reference Figure 6 Describe the optical lens according to Example 4 of the present application.

[0106] like Figure 6 As shown, the optical lens comprises a lens barrel, a lens group and at least one spacer element contained in the lens barrel. The lens group comprises, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The spacer element comprises a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6.

[0107] The parameters such as the radius of curvature, center thickness, and spacing distances between lenses and high-order coefficients of the optical lenses of this embodiment and embodiment 3 are the same, as shown in Table 3, Table 4-1, and Table 4-2. In addition, the number of spacing elements included in the optical lenses of this embodiment and embodiment 3 is also the same, and the only difference is that the actual parameters of the lens barrel and each spacing element are different, for example, at least one of the parameters such as the lens barrel size, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, and the spacing distance between the spacing elements is different. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens of embodiment 4 of the present application is as follows: 7A to 7C shown.

[0108] Example 5

[0109] The following reference Figure 8 Describe the optical lens according to Example 5 of the present application.

[0110] like Figure 8 As shown, the optical lens comprises a lens barrel, a lens group and at least one spacer element contained in the lens barrel. The lens group comprises, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The spacer element comprises a first spacer element P1, a second spacer element P2, a third spacer element P3, a third auxiliary spacer element P3b, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, and a sixth spacer element P6.

[0111] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has negative focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The optical lens also includes a filter (not shown) arranged between the sixth lens E6 and the imaging surface S15.

[0112] Table 5 shows the basic parameter table of the optical lens of Example 5, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0113]

[0114]

[0115] Table 5

[0116] In Example 5, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by the formula (1) given in the above Example 1. The following Tables 6-1 and 6-2 give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0117] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.1935E-02 -2.0064E-03 -4.1161E-04 1.6364E-05 -1.0050E-05 1.1333E-05 -1.0007E-06 S2 -1.6203E-01 -6.7497E-03 -5.3886E-04 3.3003E-04 9.8566E-05 5.3101E-05 -3.2916E-06 S3 -1.5819E-01 -6.4365E-03 2.4639E-03 1.5736E-03 4.8635E-04 4.2920E-05 -6.2798E-05 S4 -1.2406E-01 -2.0196E-03 4.6324E-03 1.9846E-03 5.3333E-04 -3.8900E-05 -1.9606E-04 S5 -1.9404E-01 2.5067E-03 9.5292E-03 3.2548E-03 3.8046E-04 -5.3481E-04 -5.2203E-04 S6 -3.0359E-01 1.4110E-02 1.1679E-02 3.0217E-03 1.0345E-03 2.4849E-04 -1.6523E-04 S7 -2.7513E-01 -7.7238E-02 -1.0884E-02 5.0275E-03 8.3053E-04 1.0732E-03 1.0176E-05 S8 -3.8570E-01 -1.5013E-02 -2.9882E-02 2.0488E-03 9.2323E-05 2.7174E-03 1.3415E-03 S9 -5.2855E-01 1.5347E-02 4.0739E-02 -4.1296E-02 8.5881E-03 3.9268E-03 2.7029E-03 S10 -2.2811E-01 -1.2627E-01 7.5697E-02 -4.4734E-02 1.5080E-02 -5.8312E-03 3.0638E-03 S11 -9.2529E-01 3.0105E-01 -1.0377E-01 2.8077E-02 -7.4427E-03 1.5768E-03 5.6168E-04 S12 -2.0275E+00 4.6741E-01 -1.1200E-01 2.9761E-02 -1.2531E-02 6.0633E-03 -2.3093E-03

[0118] Table 6-1

[0119]

[0120]

[0121] Table 6-2

[0122] Fig. 10A The axial chromatic aberration curve of the optical lens of Example 5 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig. 10B The astigmatism curve of the optical lens of Example 5 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig. 10C The magnification chromatic aberration curve of the optical lens of Example 5 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 10A to FIG. 10C It can be seen that the optical lens provided in Example 5 can achieve good imaging quality.

[0123] Example 6

[0124] The following reference Fig. 9 Describe the optical lens according to Example 6 of the present application.

[0125] like Fig. 9As shown, the optical lens comprises a lens barrel, a lens group and at least one spacer element contained in the lens barrel. The lens group comprises, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The spacer element comprises a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6.

[0126] The parameters such as the radius of curvature, center thickness, and spacing distances between lenses and high-order coefficients of the optical lenses of this embodiment and embodiment 5 are the same, as shown in Table 5, Table 6-1, and Table 6-2. In addition, the number of spacing elements included in the optical lenses of this embodiment and embodiment 5 is also the same, and the only difference is that the actual parameters of the lens barrel and each spacing element are different, for example, at least one of the parameters such as the lens barrel size, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, and the spacing distance between the spacing elements is different. In other words, the main structure for imaging is the same, while the auxiliary structure for imaging is different. Therefore, the imaging quality of the optical lens of embodiment 6 of the present application is as follows: FIG. 10A to FIG. 10C shown.

[0127] Table 7 below shows some parameters of the optical lenses of Examples 1 to 6, such as the effective focal length of each lens, and the maximum effective radius of the object side or image side of some lenses, etc. The units of the focal length value, distance or effective radius value are all millimeters (mm).

[0128] Parameter value / example 1 2 3 4 5 6 f1 521.19 521.19 85.60 85.60 110.98 110.98 f2 5.35 5.35 8.56 8.56 7.67 7.67 f3 12.11 12.11 8.23 8.23 16.00 16.00 f4 105.43 105.43 49.45 49.45 -124.36 -124.36 f5 3.70 3.70 3.43 3.43 5.05 5.05 f6 -3.46 -3.46 -2.97 -2.97 -4.51 -4.51 f12 5.64 5.64 8.19 8.19 7.63 7.63 f45 3.84 3.84 4.42 4.42 5.37 5.37

[0129] Table 7

[0130] Table 8 below shows some basic parameters of the lens barrel and the spacer element of the optical lens of Examples 1 to 6, such as d1s, d1m, D1s, d2s, d2m, D2m, EP01, EP23, EP45, EP56, CP5 and L. The units of the basic parameters listed in Table 8 are all millimeters (mm).

[0131] Parameter value / example 1 2 3 4 5 6 d1s(mm) 2.419 2.419 1.970 2.014 1.982 1.999 d1m(mm) 2.375 2.375 1.926 1.970 1.938 1.955 D1s(mm) 3.125 3.125 2.538 3.665 2.550 3.808 d2s(mm) 2.207 2.212 2.159 2.226 2.137 2.128 d2m(mm) 2.163 2.168 2.115 2.182 2.093 2.084 D2m(mm) 3.336 3.336 2.813 3.923 4.185 4.327 D3s(mm) 4.490 4.490 3.786 3.763 4.060 4.274 d4s(mm) 2.575 2.660 2.964 2.964 2.850 2.850 d4m(mm) 2.550 2.635 2.920 2.920 2.806 2.806 D5m(mm) 5.036 5.036 4.540 4.540 5.302 5.302 CP2(mm) 0.022 0.022 0.022 0.022 0.022 0.022 CP5(mm) 0.022 0.022 0.022 0.022 0.022 0.022 EP01(mm) 0.671 0.671 0.592 0.641 0.739 0.797 EP23(mm) 0.490 0.480 0.573 0.419 0.473 0.473 EP34(mm) 0.762 0.742 0.475 0.475 0.543 0.563 EP45(mm) 0.554 0.677 0.445 0.445 0.506 0.506

[0132] Table 8 In summary, in Examples 1 to 6, the optical lenses respectively meet the conditions in Table 9 below.

[0133] Conditional / Example 1 2 3 4 5 6 f1 / D1s 166.76 166.76 33.73 23.36 43.52 29.14 (R1+R2)*V1 / d1s 55.14 55.14 27.27 26.67 37.93 37.62 (EP01+T12) / CT1 3.39 3.39 4.10 4.34 3.96 4.19 f2 / R3 / d1m 1.35 1.35 2.45 2.39 2.28 2.26 f12 / D2m 1.69 1.69 2.91 2.09 1.82 1.76 f3*T34 / (EP23+CT3) 3.87 3.91 2.01 2.34 6.73 6.73 CT3*EP23 / (CT4*EP34) 1.13 1.14 1.52 1.11 1.58 1.53 (d2s-d2m)*N2 / CP2 3.32 3.32 3.40 3.40 3.14 3.14 D3s*T34 / R5 0.35 0.35 0.24 0.24 0.38 0.40 d4s / R7+d4m / R8 1.91 1.97 1.83 1.83 1.80 1.80 f5 / (CP5+T45) 40.80 40.80 66.94 66.94 29.93 29.93 f45 / EP45 6.72 5.50 7.55 7.55 10.77 10.77 f6*V6 / D5m -31.03 -31.03 -27.76 -27.76 -42.87 -42.87

[0134] Table 9

[0135] FIG. 11A to FIG. 13B The defocus curves and relative illumination curves of Sample 1, Sample 2, and Sample 3 of the optical lens are shown respectively.

[0136] According to the sample 1 of the optical lens, f1 / D1s=23.36, (R1+R2)*V1 / d1s=26.67. Fig.11A and Fig. 11B From the above, when the optical lens meets the numerical ranges of 23.0<f1 / D1s<167.0 and 25.0<(R1+R2)*V1 / d1s<56.0, the focus shift of the defocus curve is very small and has a high relative illumination.

[0137] According to the sample 2 of the optical lens, f1 / D1s=18.2, (R1+R2)*V1 / d1s=21.4. Fig. 12A and Fig. 12B It can be seen that when the lower limit of the numerical range is below 23.0<f1 / D1s<167.0 and 25.0<(R1+R2)*V1 / d1s<56.0, the optical lens has focus shift and the relative illumination drops seriously.

[0138] According to sample 3 of the optical lens, f1 / D1s=179.2, (R1+R2)*V1 / d1s=57.4. Fig.13A and Fig. 13B It can be seen that when the upper limit of the numerical range of 23.0<f1 / D1s<167.0 and 25.0<(R1+R2)*V1 / d1s<56.0 is exceeded, the focus shift of the defocus curve of the optical lens is more serious and the relative illumination is also reduced.

[0139] The experimental comparison results of the optical lens samples 1, 2 and 3 are shown in Table 10. According to the comparison results in Table 10, when the optical lens satisfies the numerical ranges of 23.0<f1 / D1s<167.0 and 25.0<(R1+R2)*V1 / d1s<56.0, the focus shift of the defocus curve is generally good and has a higher RI value.

[0140]

[0141] Table 10

[0142] When the optical lens satisfies both the numerical ranges of 23.0<f1 / D1s<167.0 and 25.0<(R1+R2)*V1 / d1s<56.0, the stray light elimination effect is better. However, when the numerical range exceeds one of the conditions, stray light is likely to appear. FIG. 11A to FIG. 13BFrom the perspective of the optical system, by controlling the effective focal length of the first lens and the outer diameter of the object side of the first spacing element, and then controlling the exit angle of the edge field light in the system, it is beneficial to improve the RI value of the system, but this also makes the first lens more sensitive and has a higher risk of stray light; by controlling the optical lens within the range of 23.0<f1 / D1s<167.0 and 25.0<(R1+R2)*V1 / d1s<56.0, it is beneficial to reduce the stray light generated by the edge light entering the mechanism part of the lens, thereby effectively reducing the stray light energy and ensuring the imaging quality of the optical lens.

[0143] When the optical lens satisfies the numerical ranges of 23.0<f1 / D1s<167.0 and 25.0<(R1+R2)*V1 / d1s<56.0 at the same time, the effect of eliminating stray light is better, while stray light is likely to appear when the numerical range of one of the conditional expressions is exceeded.

[0144] In addition, different stray lights may appear for different incident angles, but in general, when the optical lens satisfies the numerical ranges of 23.0<f1 / D1s<167.0 and 25.0<(R1+R2)*V1 / d1s<56.0 at the same time, it is beneficial to improve the field curvature and chromatic aberration correction of the optical structure, so that the lens has small field curvature, low dispersion and high RI, while reducing the sensitivity of the first lens, improving the stray light in the first lens structure area, and making the optical lens have a better stray light elimination effect, thereby ensuring the imaging quality of the optical lens.

[0145] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. An optical lens, characterized in that: The invention comprises a lens barrel having a receiving space, and a lens group and at least one spacer element received in the lens barrel, wherein: The lens group comprises: a first lens with positive optical power, a second lens with optical power, a third lens with optical power, a fourth lens with optical power, a fifth lens with optical power and a sixth lens with optical power, which are arranged in sequence from the object side to the image side along the optical axis; The at least one spacer element includes a first spacer element located between the first lens and the second lens and in direct contact with the image side of the first lens; Wherein, the effective focal length f1 of the first lens and the outer diameter D1s of the object side surface of the first spacing element satisfy: 23.0<f1 / D1s<167.0; and A curvature radius R1 of the object side surface of the first lens, a curvature radius R2 of the image side surface of the first lens, an Abbe number V1 of the first lens, and an inner diameter d1s of the object side surface of the first spacer element satisfy: 25.0<(R1+R2)*V1 / d1s<56.

0.

2. The optical lens according to claim 1, wherein: The interval EP01 between the front end surface of the lens barrel and the first spacing element, the air interval T12 between the first lens and the second lens on the optical axis, and the center thickness CT1 of the first lens on the optical axis satisfy: 3.0<(EP01+T12) / CT1<4.

5.

3. The optical lens according to claim 1, wherein: The effective focal length f2 of the second lens, the curvature radius R3 of the object side surface of the second lens, and the inner diameter d1m of the image side surface of the first spacer element satisfy: 1.0 mm -1 <f2 / R3 / d1m<2.5mm -1 .

4. The optical lens according to claim 1, wherein: The at least one spacer element further comprises a second spacer element located between the second lens and the third lens and in direct contact with the image side of the second lens, The combined focal length f12 of the first lens and the second lens and the outer diameter D2m of the image side surface of the second spacer element satisfy: 1.5<f12 / D2m<3.

0.

5. The optical lens according to claim 1, wherein: The at least one spacing element further comprises a second spacing element located between the second lens and the third lens and in direct contact with the image side of the second lens, and a third spacing element located between the third lens and the fourth lens and in direct contact with the image side of the third lens, The effective focal length f3 of the third lens, the air gap T34 between the third lens and the fourth lens on the optical axis, the gap EP23 between the second spacing element and the third spacing element, and the center thickness CT3 of the third lens on the optical axis satisfy: 1.8mm<f3*T34 / (EP23+CT3)<7.0mm.

6. The optical lens according to claim 1, wherein: The at least one spacing element further includes a second spacing element located between the second lens and the third lens and in direct contact with the image side of the second lens, a third spacing element located between the third lens and the fourth lens and in direct contact with the image side of the third lens, and a fourth spacing element located between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens, The center thickness CT3 of the third lens on the optical axis, the interval EP23 between the second spacer element and the third spacer element, the center thickness CT4 of the fourth lens on the optical axis, and the interval EP34 between the third spacer element and the fourth spacer element satisfy: 1.0<CT3*EP23 / (CT4*EP34)<1.

6.

7. The optical lens according to claim 1, wherein: The at least one spacer element further comprises a second spacer element located between the second lens and the third lens and in direct contact with the image side of the second lens, An inner diameter d2s of the object side surface of the second spacer element, an inner diameter d2m of the image side surface of the second spacer element, a refractive index N2 of the second lens, and a maximum thickness CP2 of the second spacer element satisfy: 3.0<(d2s-d2m)*N2 / CP2<3.

5.

8. The optical lens according to claim 1, wherein: The at least one spacing element further includes a third spacing element located between the third lens and the fourth lens and in direct contact with the image side of the third lens, and a fourth spacing element located between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens, The outer diameter D3s of the object side surface of the third spacer element, the air gap T34 between the third lens and the fourth lens on the optical axis, and the curvature radius R5 of the object side surface of the third lens satisfy: 0.0mm<D3s*T34 / R5<0.5mm.

9. The optical lens according to claim 1, wherein: The at least one spacer element further comprises a fourth spacer element located between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens, An inner diameter d4s of the object side surface of the fourth spacing element, a curvature radius R7 of the object side surface of the fourth lens, a curvature radius R8 of the image side surface of the fourth lens, and an inner diameter d4m of the image side surface of the fourth spacing element satisfy: 1.5<d4s / R7+d4m / R8<2.

0.

10. The optical lens according to claim 1, wherein: The at least one spacer element further comprises a fifth spacer element located between the fifth lens and the sixth lens and in direct contact with the image side of the fifth lens, The effective focal length f5 of the fifth lens, the maximum thickness CP5 of the fifth spacing element, and the air spacing T45 between the fourth lens and the fifth lens on the optical axis satisfy: 29.0<f5 / (CP5+T45)<67.

0.

11. The optical lens according to claim 1, wherein: The at least one spacing element further includes a fourth spacing element located between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens, and a fifth spacing element located between the fifth lens and the sixth lens and in direct contact with the image side of the fifth lens, A combined focal length f45 of the fourth lens and the fifth lens and an interval EP45 between the fourth spacing element and the fifth spacing element satisfy: 5.0<f45 / EP45<11.

0.

12. The optical lens according to claim 1, wherein: The at least one spacer element further comprises a fifth spacer element located between the fifth lens and the sixth lens and in direct contact with the image side of the fifth lens, The effective focal length f6 of the sixth lens, the Abbe number V6 of the sixth lens, and the outer diameter D5m of the image-side surface of the fifth spacing element satisfy: -43.0<f6*V6 / D5m<-27.

0.

13. The optical lens according to claim 1, wherein: The first lens has positive optical power, the second lens has positive optical power, the third lens has positive optical power, the fifth lens has positive optical power, and the sixth lens has negative optical power.

Images