Optical photographic lens

Abstract

The embodiment of the utility model discloses an optical photographic 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 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 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 curvature radius R5 of the object side face of the third lens and the curvature radius R6 of the image side face of the third lens meet the condition that R6 / R5 is larger than 1.5 and smaller than 2.0. And the effective focal length f3 of the third lens and the inner diameter d3s of the object side surface of the third spacing element meet the condition that f3 / d3s is greater than 3.2 and less than 4.2.

Description

Technical Field

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

[0002] Small infrared lenses are widely used in feature recognition electronic terminal equipment, with the characteristics of non-contact, light, and all-weather operation. This type of lens has high requirements for the detailed recognition of the object being photographed.

[0003] Therefore, in order to meet the demand for detail recognition of the object being photographed, it is necessary to design an optical photography 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 photographic lens is provided, which includes a lens barrel with a accommodating space, and a lens group and at least one spacer element accommodated in the lens barrel, wherein the lens group includes: a first lens with optical focal length, a second lens with optical focal length, a third lens with optical focal length, a fourth lens with optical focal length, a fifth lens with optical focal length, and a sixth lens with optical focal length, 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 third spacer element located between the third lens and the fourth lens and directly in contact with the image side of the third lens; wherein the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 1.5<R6 / R5<2.0; and the effective focal length f3 of the third lens and the inner diameter d3s of the object side surface of the third spacer element satisfy: 3.2<f3 / d3s<4.2.

[0005] 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 curvature radius R10 of the image side surface of the fifth lens, the refractive index N5 of the fifth lens, and the inner diameter d5s of the object side surface of the fifth spacer element satisfy: -75.0<R10*N5 / d5s<-18.0.

[0006] In one or more embodiments, at least one spacer element also 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, and the spacing EP01 between the front end surface of the lens barrel and the first spacer element, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 3.5<(EP01+CT2) / CT1<5.0.

[0007] In one or more embodiments, at least one spacer element also 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, and 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 interval EP12 between the first spacer element and the second spacer element, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 0.9<EP12 / CT2<1.1; 1.4<CT2 / CT1≤2.3.

[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 the effective focal length f2 of the second lens, the refractive index N2 of the second lens, and the inner diameter d2s of the object side of the second spacer element satisfy: 5.5<f2*N2 / d2s<6.5.

[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, and the combined focal length f12 of the first lens and the second lens, the outer diameter D2m of the image side surface of the second spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy: 7.0<f12 / (D2m-d2m)<17.5.

[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 air gap T23 between the second lens and the third lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, and the interval EP23 between the second spacer element and the third spacer element satisfy: 1.5<(T23+CT3+T34) / EP23<2.0.

[0011] 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 interval EP45 between the fourth spacer element and the fifth spacer element, the maximum thickness CP5 of the fifth spacer element, and the center thickness CT5 of the fifth lens on the optical axis satisfy: 1.5<(EP45+CP5) / CT5<2.5.

[0012] 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 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, and the air spacer T56 on the optical axis between the fifth lens and the sixth lens and the spacer EP56 between the fifth spacer element and the sixth spacer element satisfy: 0.9<T56 / EP56<2.1.

[0013] In one or more embodiments, at least one spacer element also 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, and the curvature radius R1 of the object side surface of the first lens, the inner diameter d1s of the object side surface of the first spacer element, and the inner diameter d1m of the image side surface of the first spacer element satisfy: 31.0<R1 / (d1s-d1m)<33.5.

[0014] In one or more embodiments, at least one spacer element also 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, and 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 interval EP12 between the first spacer element and the second spacer element and the interval EP01 between the front end surface of the lens barrel and the first spacer element satisfy: 0.5<EP12 / EP01<1.0.

[0015] 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 the curvature radius R7 of the object side surface of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the outer diameter D4m of the image side surface of the fourth spacer element satisfy: 1.5<D4s / R7+D4m / R8≤2.5.

[0016] 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 curvature radius R9 of the object side surface of the fifth lens, the refractive index N5 of the fifth lens, and the outer diameter D5s of the object side surface of the fifth spacer element satisfy: 0.4<R9*N5 / D5s<0.6.

[0017] 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 and the inner diameter d5m of the image side surface of the fifth spacer element satisfy: -3.5<f6 / d5m<-0.9.

[0018] In one or more embodiments, the maximum height L of the lens barrel along the optical axis and the sum ΣCT of the center thicknesses of all lenses in the lens group on the optical axis satisfy: 1.6<L / ΣCT<1.8.

[0019] In one or more embodiments, an outer diameter D3s of the object side surface of the third spacer element, a curvature radius R5 of the object side surface of the third lens, a curvature radius R6 of the image side surface of the third lens, and an outer diameter D3m of the image side surface of the third spacer element satisfy: 1.7<D3s / R5+D3m / R6<2.9.

[0020] 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 the combined focal length f45 of the fourth lens and the fifth lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: 2.0<f45 / (D4s-d4s)<6.5.

[0021] 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 combined focal length f56 of the fifth lens and the sixth lens and the outer diameter D5m of the image side surface of the fifth spacer element satisfy: 0.8<f56 / D5m<2.4.

[0022] 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 f5 of the fifth lens, the radius of curvature R10 of the image side surface of the fifth lens, and the inner diameter d5s of the object side surface of the fifth spacer element satisfy: 1.1<f5 / R10+f5 / d5s<3.0.

[0023] In one or more embodiments, the first lens has negative optical power, the second lens has positive optical power, the third lens has positive optical power, the fourth lens has negative optical power, the fifth lens has positive optical power, and the sixth lens has negative optical power.

[0024] The optical photography lens provided in the present application adopts a six-piece lens group. By reasonably controlling the number of lenses with optical power in the lens group and the distribution of optical power of each lens, the lens has small field curvature and low dispersion, and improves RI (relative illumination). However, it also makes the third lens more sensitive and the structural part is prone to stray light. By satisfying 1.5<R6 / R5<2.0 and 3.0<f3 / d3s<4.2, it is beneficial to improve the field curvature 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, ensuring high imaging resolution and increasing the ability of terminal electronic devices to identify details; at the same time, it is also beneficial to reduce the sensitivity of the third lens while improving RI, improve the stray light in the third lens structure area, and thus improve the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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:

[0026] Figure 1 A schematic diagram showing the structure and some parameters of an optical photographic lens according to an embodiment of the present application is shown;

[0027] Figure 2 A schematic structural diagram of an optical photographic lens according to Embodiment 1 of the present application is shown;

[0028] Figure 3 A schematic structural diagram of an optical photographic lens according to Embodiment 2 of the present application is shown;

[0029] FIG. 4A to FIG. 4C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical photographic lens according to Example 1 and Example 2 of the present application are respectively shown;

[0030] Figure 5 A schematic structural diagram of an optical photographic lens according to Embodiment 3 of the present application is shown;

[0031] Figure 6 A schematic structural diagram of an optical photographic lens according to Embodiment 4 of the present application is shown;

[0032] 7A to 7C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical photographic lens according to Example 3 and Example 4 of the present application are respectively shown;

[0033] Figure 8 A schematic structural diagram of an optical photographic lens according to Embodiment 5 of the present application is shown;

[0034] Fig. 9 A schematic structural diagram of an optical photographic lens according to Embodiment 6 of the present application is shown;

[0035] FIG. 10A to FIG. 10C The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical photographic lens according to Example 5 and Example 6 of the present application are respectively shown;

[0036] Fig.11A and Fig. 11B The defocus curve and relative illumination curve of the sample 1 of the optical photographic lens are shown respectively;

[0037] Fig. 12A and Fig. 12B The defocus curve and relative illumination curve of the sample 2 of the optical photographic lens are shown respectively;

[0038] Fig.13 shows a defocus curve of Sample 3 of the optical photographic lens;

[0039] Fig.14A , Fig. 14B and Fig. 14C Schematic diagrams showing the positions of stray light when the sample 2 of the optical photographic lens is greater than the upper limits of the numerical ranges of 1.5<R6 / R5<2.0 and 3.0<f3 / d3s<4.2 respectively; and

[0040] Fig.15 A schematic diagram of stray light when the optical photographic lens sample 1 satisfies the numerical ranges of 1.5<R6 / R5<2.0 and 3.0<f3 / d3s<4.2 is shown. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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 photographic 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 interval T12 between the first lens and the second lens on the optical axis, etc., are not shown in the figure. Figure 1It is shown in Figure 1 Only some parameters of the lens barrel and the spacer element of an optical photographic lens of the present application are shown as examples to facilitate a better understanding of the present invention. Figure 1 As shown, EP01 represents the spacing between the front end face of the lens barrel close to the object side and the object side face of the first spacing element along the optical axis; EP12 represents the spacing between the image side face of the first spacing element and the object side face of the second spacing element along the optical axis; EP23 represents the spacing between the image side face of the second spacing element and the object side face of the third spacing element along the optical axis; EP45 represents the spacing between the image side face of the fourth spacing element and the object side face of the fifth spacing element along the optical axis; CP5 represents the maximum thickness of the fifth spacing element along the optical axis; D0s represents the outer diameter of the front end face of the lens barrel close to the object side closest to the object side; D1s represents the outer diameter of the object side face of the first spacing element; d1s represents the inner diameter of the object side face of the first spacing element; D1m represents the outer diameter of the image side face of the first spacing element; d1m represents the inner diameter of the image side face of the first spacing element; D2s represents the outer diameter of the object side face of the second spacing element; d2s represents the inner diameter of the object side face of the second spacing element; D2m represents the outer diameter of the image side face of the second spacing element; d2m represents the inner diameter of the image side face of the second spacing element, and so on.

[0049] The features, principles and other aspects of the present application are described in detail below.

[0050] refer to Figure 2 and Figure 3 As shown, the first aspect of the present application provides such an optical photography 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 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. Any two adjacent lenses from the first lens to the sixth lens may have a spacing distance between them.

[0051] In an exemplary embodiment, the first lens may have negative power. The second lens may have positive power. The third lens may have positive power. The fourth lens may have negative power. The fifth lens may have positive power. The sixth lens may have negative power.

[0052] 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.

[0053] According to an exemplary embodiment of the present application, the optical photographic lens includes at least one spacer element, for example, 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. Exemplarily, the 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 photographic lens, and improve the assembly stability of the optical photographic lens.

[0054] 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.

[0055] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 1.5<R6 / R5<2.0; 3.2<f3 / d3s<4.2, wherein R5 is the radius of curvature of the object side of the third lens, R6 is the radius of curvature of the image side of the third lens, f3 is the effective focal length of the third lens, and d3s is the inner diameter of the object side of the third spacer element. By controlling the optical photography lens to satisfy the conditional formulas 1.5<R6 / R5<2.0 and 3.0<f3 / d3s<4.2, it is beneficial to improve the field curvature and chromatic aberration correction of the optical structure, realize the design of small field curvature, low astigmatism and small chromatic aberration of the lens, ensure high imaging resolution, increase the ability of terminal electronic devices to recognize details, and enable the lens to have small field curvature, low dispersion and high RI while reducing the sensitivity of the third lens, improving the stray light in the third lens structure area, thereby improving the imaging quality.

[0056] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: -75.0<R10*N5 / d5s<-18.0, wherein R10 is the radius of curvature of the image side surface of the fifth lens, N5 is the refractive index of the fifth lens, and d5s is the inner diameter of the object side surface of the fifth spacer element. By satisfying the above conditional formula, by controlling the relationship between the radius of curvature of the image side surface of the fifth lens and the refractive index of the fifth lens and the inner diameter of the object side surface of the fifth spacer element, the fifth lens can converge the internal field of view light, improve the internal field of view performance, and diverge the external field of view light to achieve the purpose of designing the image height; at the same time, it is beneficial to shield the stray light generated by the edge of the effective diameter of the fifth lens and improve the imaging quality.

[0057] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 3.5<(EP01+CT2) / CT1<5.0, wherein EP01 is the interval between the front end face of the lens barrel and the first spacing element, CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis. By satisfying the above conditional formula, the purpose of controlling the relative position of the front end of the lens barrel and the optical system is achieved by controlling the interval between the front end face of the lens barrel and the first spacing element and the center thickness of the first and second lenses on the optical axis, and the total height of the lens barrel is indirectly controlled within a reasonable range, which not only avoids the convexity of the optical lens due to the small total height of the lens barrel, but also avoids the problem of the overall lens being too large due to the high total height of the lens barrel.

[0058] In an exemplary embodiment, the optical photography lens according to the present application can satisfy the following conditional formula: 0.9<EP12 / CT2<1.1; 1.4<CT2 / CT1≤2.3, wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and EP12 is the interval between the first spacing element and the second spacing element. By satisfying the above conditional formula, on the one hand, by controlling the ratio of the center thickness of the second lens to the center thickness of the first lens, the divergence angle of the light in the front lens group is controlled to meet the design requirements of the rear lens group; on the other hand, by simultaneously controlling the ratio of the spacing distance between the first spacing element and the second spacing element to the center thickness of the second lens, the relationship between the center and edge thickness of the second lens is controlled to make the overall shape of the second lens transition smooth, avoid excessive thickness ratio fluctuations, and increase molding stability.

[0059] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 5.5<f2*N2 / d2s<6.5, wherein f2 is the effective focal length of the second lens, N2 is the refractive index of the second lens, and d2s is the inner diameter of the object side surface of the second spacer element. By satisfying the above conditional formula, the purpose of controlling the divergence range of the edge light is achieved by controlling the relationship between the effective focal length of the second lens and the refractive index of the second lens and the inner diameter of the object side surface of the second spacer element, and while meeting the design requirements of the rear lens group, the RI of the edge field of view is improved to avoid the generation of dark corners.

[0060] In an exemplary embodiment, the optical photography lens according to the present application can satisfy the following conditional formula: 7.0<f12 / (D2m-d2m)<17.5, wherein f12 is the combined focal length of the first lens and the second lens, D2m is the outer diameter of the image side surface of the second spacing element, and d2m is the inner diameter of the image side surface of the second spacing element. By satisfying the above conditional formula, the outer diameter of the front lens group can be controlled by controlling the ratio of the combined focal length of the first and second lenses to the difference between the outer and inner diameters of the second spacing element, thereby preventing the front end from being too large and exceeding the external specifications; at the same time, the main light rays incident on and emitted from the second lens can be within a reasonable angle range, thereby effectively reducing the risk of stray light.

[0061] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 1.5<(T23+CT3+T34) / EP23<2.0, wherein T23 is the air spacing between the second lens and the third lens on the optical axis, T34 is the air spacing between the third lens and the fourth lens on the optical axis, CT3 is the center thickness of the third lens on the optical axis, and EP23 is the spacing between the second spacing element and the third spacing element. The above conditional formula is satisfied, and by controlling the ratio of the sum of the center thickness and air spacing of the second and third lenses to the spacing between the second and third spacing elements, the relationship between the center and edge thickness of the third lens is controlled, so that the overall shape of the third lens has a smooth transition, avoiding excessive thickness ratio fluctuations, and increasing molding stability.

[0062] In an exemplary embodiment, the optical photographic lens according to the present application may satisfy the following conditional formula: 1.5<(EP45+CP5) / CT5<2.5, wherein EP45 is the spacing between the fourth spacing element and the fifth spacing element, CP5 is the maximum thickness of the fifth spacing element, and CT5 is the center thickness of the fifth lens on the optical axis. By satisfying the above conditional formula, the position of the assembly surface of the sixth lens is controlled by controlling the relationship between the spacing distance between the fourth and fifth spacing elements and the maximum thickness of the fifth spacing element and the center thickness of the fifth lens. Specifically, in order to ensure the manufacturability of the fifth lens, the ratio of the spacing distance between the fourth and fifth spacing elements to the center thickness of the fifth lens needs to be close, and at this time, the assembly distance between the fifth lens and the sixth lens needs to be controlled by the fifth spacing element. Therefore, satisfying this conditional formula can ensure the manufacturability and assembly feasibility of the fifth and sixth lenses.

[0063] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 0.9<T56 / EP56<2.1, wherein T56 is the air spacing between the fifth lens and the sixth lens on the optical axis, and EP56 is the spacing between the fifth spacing element and the sixth spacing element. By satisfying the above conditional formula, the purpose of controlling the edge thickness of the sixth lens is achieved by controlling the ratio of the air spacing between the fifth and sixth lenses to the spacing distance between the fifth and sixth spacing elements, thereby avoiding the design space of the compression ring being squeezed due to the excessive edge thickness, and the weld mark problem caused by the excessive thickness ratio between the edge and the center of the sixth lens, and at the same time, the performance stability risk caused by the excessive thickness ratio between the edge and the center of the sixth lens can be avoided.

[0064] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 31.0<R1 / (d1s-d1m)<33.5, wherein R1 is the radius of curvature of the object side surface of the first lens, d1s is the inner diameter of the object side surface of the first spacing element, and d1m is the inner diameter of the image side surface of the first spacing element. By satisfying the above conditional formula, the shape of the inner diameter chamfer of the first spacing element is controlled by controlling the ratio of the radius of curvature of the object side surface of the first lens to the aperture difference between the object side surface and the image side surface of the first spacing element, thereby avoiding stray light generated by reflection of the object side surface of the first lens to the inner diameter surface of the first spacing element.

[0065] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 0.5<EP12 / EP01<1.0, wherein EP12 is the interval between the first spacing element and the second spacing element, and EP01 is the interval between the front end face of the lens barrel and the first spacing element. The above conditional formula 0.5<EP12 / EP01<1.0 is satisfied, and by controlling the ratio of the spacing distance between the first and second spacing elements to the spacing distance between the front end face of the lens barrel and the first spacing element, on the basis of satisfying the conditional formula 3.5<(EP01+CT2) / CT1<5.0, the edge assembly thickness of the first and second lenses is controlled as a whole, so that the thickness transition of the front lens group is more uniform, and the molding stability is increased.

[0066] In an exemplary embodiment, the optical photography lens according to the present application can satisfy the following conditional formula: 1.5<D4s / R7+D4m / R8≤2.5, 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 outer diameter of the object side surface of the fourth spacer element, and D4m is the outer diameter of the image side surface of the fourth spacer element. By satisfying the above conditional formula, by controlling the relationship between the radius of curvature of the object side surface and the image side surface of the fourth lens and the outer diameter of the object side surface and the image side surface of the fourth spacer element, the purpose of limiting the outer diameter of the fourth and fifth lenses can be achieved while meeting the requirements of the rear-end lens group design, thereby indirectly limiting the size of the lens waist, which is conducive to miniaturization of the lens; at the same time, while controlling the overall shape of the fourth lens, the light transmittance of the optical system can be guaranteed by adjusting the direction of the light, thereby achieving the purpose of controlling the stray light generated by the fourth lens when incident in different wavelength bands.

[0067] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 0.4<R9*N5 / D5s<0.6, wherein R9 is the radius of curvature of the object side surface of the fifth lens, N5 is the refractive index of the fifth lens, and D5s is the outer diameter of the object side surface of the fifth spacer element. By satisfying the above conditional formula, the purpose of controlling the shape and outer diameter of the fifth lens is achieved by controlling the relationship between the radius of curvature of the object side surface of the fifth lens, the refractive index of the fifth lens, and the outer diameter of the object side surface of the fifth spacer element, thereby preventing the shape of the fifth lens from being too distorted and affecting the molding stability.

[0068] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: -3.5<f6 / d5m<-0.9, wherein f6 is the effective focal length of the sixth lens, and d5m is the inner diameter of the image side surface of the fifth spacing element. By satisfying the above conditional formula, the purpose of controlling the range of the edge light of the sixth lens is achieved by controlling the ratio of the effective focal length of the sixth lens to the inner diameter of the image side surface of the fifth spacing element, and the generation of stray light is avoided while ensuring the optical parameters, thereby ensuring the image quality of the image surface.

[0069] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 1.6<L / ∑CT<1.8, wherein L is the maximum height of the lens barrel along the optical axis, and ∑CT is the sum of the center thicknesses of all lenses in the lens group on the optical axis. The above conditional formula is satisfied, and by controlling the ratio of the maximum height of the lens barrel to the sum of the center thicknesses of all lenses on the optical axis, the position of the rear end face of the lens barrel is limited on the basis of limiting the front end face of the lens barrel by satisfying the conditional formula 3.5<(EP01+CT2) / CT1<5.0, thereby controlling the total length of the lens barrel to accommodate the assembly of the rear end components.

[0070] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 1.7<D3s / R5+D3m / R6<2.9, wherein D3s is the outer diameter of the object side surface of the third spacer element, D3m is the outer diameter of the image side surface of the third spacer element, R5 is the radius of curvature of the object side surface of the third lens, and R6 is the radius of curvature of the image side surface of the third lens. By satisfying the above conditional formula, the purpose of limiting the shape and outer diameter of the third lens is achieved by controlling the relationship between the outer diameters of the object side surface and the image side surface of the third spacer element and the radius of curvature of the object side surface and the image side surface of the third lens; in addition, by simultaneously satisfying the conditional formulas 1.7<D3s / R5+D3m / R6<2.9 and 7.0<f12 / (D2m-d2m)<17.5, the function of controlling the aperture of the front lens can be achieved together to avoid the front end size of the lens being too large.

[0071] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 2.0<f45 / (D4s-d4s)<6.5, wherein 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 spacing element, and d4s is the inner diameter of the object side surface of the fourth spacing element. By satisfying the above conditional formula, the purpose of controlling the outer diameters of the fourth and fifth lenses is achieved by controlling the ratio of the combined focal length of the fourth lens and the fifth lens to the difference between the outer diameter and the inner diameter of the object side surface of the fourth spacing element; in addition, by simultaneously satisfying the conditional formulas 2.0<f45 / (D4s-d4s)<6.5 and 1.5<D4s / R7+D4m / R8≤2.5, the size of the lens waist and the rear end is jointly limited, so that the size change of the inner diameter of the rear end of the lens barrel is more uniform, ensuring the stability of the lens assembly, and contributing to the miniaturization of the lens.

[0072] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 0.8<f56 / D5m<2.4, wherein f56 is the combined focal length of the fifth lens and the sixth lens, and D5m is the outer diameter of the image side surface of the fifth spacing element. By satisfying the above conditional formula, the purpose of controlling the outer diameter of the sixth lens is achieved by controlling the ratio of the combined focal length of the fifth lens and the sixth lens to the outer diameter of the image side surface of the fifth spacing element, and the purpose of indirectly controlling the diameter of the rear port of the lens is achieved, which is helpful to achieve miniaturization of the lens; at the same time, the purpose of controlling the gradient transition of the outer diameters of the fifth lens and the sixth lens in the lens barrel is achieved, and the stability of the lens assembly is improved.

[0073] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 1.1<f5 / R10+f5 / d5s<3.0, wherein f5 is the effective focal length of the fifth lens, R10 is the radius of curvature of the image side surface of the fifth lens, and d5s is the inner diameter of the object side surface of the fifth spacer element. By satisfying the above conditional formula, by controlling the relationship between the effective focal length of the fifth lens and the radius of curvature of the image side surface of the fifth lens and the inner diameter of the object side surface of the fifth spacer element, the overall shape of the fifth lens is controlled, and while satisfying the design requirements of the external field of view RI, the range of the marginal light is controlled to avoid the generation of stray light.

[0074] The second aspect of the present application provides such an optical photography 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, namely, 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, the fourth lens and the sixth lens may have negative optical power, and the second lens, the third lens and the fifth lens may have positive 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.

[0075] In an exemplary embodiment, the optical photography lens according to the present application can satisfy the following conditional formula: 0.9<EP12 / CT2<1.1; 1.4<CT2 / CT1≤2.3, wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and EP12 is the interval between the first spacing element and the second spacing element. By satisfying the above conditional formula, on the one hand, by controlling the ratio of the center thickness of the second lens to the center thickness of the first lens, the divergence angle of the light in the front lens group is controlled to meet the design requirements of the rear lens group; on the other hand, by simultaneously controlling the ratio of the spacing distance between the first spacing element and the second spacing element to the center thickness of the second lens, the relationship between the center and edge thickness of the second lens is controlled to make the overall shape of the second lens transition smooth, avoid excessive thickness ratio fluctuations, and increase molding stability.

[0076] The third aspect of the present application provides such an optical photography 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 focal lengths, 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. Any two adjacent lenses from the first lens to the sixth lens may have a spacing distance between them. For example, at least one spacer element may include a fifth spacer element located between the fifth lens and the sixth lens, and the fifth spacer element may contact the non-optical area of ​​the image side of the fifth lens, and illustratively, it may abut against the non-optical area of ​​the image side of the fifth lens.

[0077] In an exemplary embodiment, the optical photography lens according to the present application may satisfy the following conditional formula: 1.1<f5 / R10+f5 / d5s<3.0, wherein f5 is the effective focal length of the fifth lens, R10 is the radius of curvature of the image side surface of the fifth lens, and d5s is the inner diameter of the object side surface of the fifth spacer element. By satisfying the above conditional formula, by controlling the relationship between the effective focal length of the fifth lens and the radius of curvature of the image side surface of the fifth lens and the inner diameter of the object side surface of the fifth spacer element, the overall shape of the fifth lens is controlled, and while satisfying the design requirements of the external field of view RI, the range of the marginal light is controlled to avoid the generation of stray light.

[0078] 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 photographic lens may also include any number of spacer elements. The spacer element helps the optical photographic 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.

[0079] In some embodiments, the optical photography lens according to the present application may further include a filter and / or protective glass disposed between the sixth lens and the imaging plane, for filtering light with different wavelengths, correcting color deviation, and protecting the photosensitive element located on the imaging plane.

[0080] In some embodiments, the optical photography 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 lens and is conducive to reducing the aperture of the lens.

[0081] According to the optical photographic 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 axial 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 photographic lens more conducive to production and processing.

[0082] 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.

[0083] Embodiments 1 to 6 of the optical photographic lens applicable to the above exemplary embodiment will be further described below with reference to the accompanying drawings.

[0084] Example 1

[0085] The following reference Figure 2 An optical photographic lens according to Embodiment 1 of the present application is described.

[0086] like Figure 2 As shown, the optical photographic lens comprises a lens barrel, a lens group and at least one spacer element accommodated in the lens barrel.

[0087] 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.

[0088] The at least one spacer element includes: 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. 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 photography lens.

[0089] Exemplarily, each spacer element may include at least one spacer, for example, any one of the first spacer element P1 to the fourth spacer element P4 may include a spacer; or each spacer element may also include a spacer ring, for example, the fifth spacer element P5 or the sixth spacer element P6 may include a spacer ring.

[0090] 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 convex. The third lens E3 has negative focal power, and its object side surface S5 is concave, 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 convex. 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 photography 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). Light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0091] Table 1 shows the basic parameters of the optical photography lens of Example 1, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0092]

[0093] Table 1

[0094] 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:

[0095]

[0096] 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 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0097]

[0098]

[0099] Table 2-1

[0100] Face number A18 A20 A22 A24 A26 A28 A30 S1 -3.2699E-05 7.1438E-05 -7.4976E-06 5.3483E-05 2.4589E-05 1.7932E-05 1.3880E-05 S2 4.8139E-05 -2.6809E-05 2.2676E-06 5.0794E-05 1.2556E-05 2.0679E-05 4.2594E-05 S3 8.3677E-05 -5.8718E-05 -8.9276E-05 -6.6224E-05 -3.3664E-05 3.2273E-06 1.0251E-05 S4 5.7888E-04 2.1757E-04 5.1761E-05 -5.4135E-06 5.8824E-06 -1.4791E-05 -3.6348E-06 S5 3.9418E-05 -1.3644E-04 2.6332E-05 1.2212E-05 2.7115E-05 -1.7088E-05 4.8288E-06 S6 -8.4967E-04 -6.4036E-04 -2.0611E-04 -1.1449E-04 7.0335E-06 1.4415E-05 3.0308E-05 S7 2.3448E-04 -1.3353E-04 -1.2304E-04 -1.6576E-04 -2.8552E-05 2.2243E-05 4.0616E-05 S8 -2.1045E-04 1.0003E-04 1.9744E-04 2.4585E-05 -5.6792E-05 -3.7747E-05 -2.0057E-05 S9 1.4215E-03 1.1394E-03 -3.0865E-04 -5.0634E-04 -1.8113E-04 2.6278E-05 -4.1036E-06 S10 9.5096E-04 -5.4953E-04 2.9496E-04 9.7208E-05 -1.2588E-05 -1.1354E-04 -1.0723E-04 S11 1.8032E-04 -2.3614E-04 1.3403E-04 7.9587E-05 1.3456E-05 -5.1883E-06 -2.7579E-06 S12 7.8489E-04 -1.9422E-03 2.6110E-04 9.9182E-06 2.2791E-05 -1.8676E-05 1.5700E-05

[0101] Table 2-2

[0102] Figure 4A The axial chromatic aberration curve of the optical photography lens of Example 1 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 4B The astigmatism curve of the optical photographic lens of Example 1 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 4C The chromatic aberration curve of the optical photographic lens of Example 1 is shown, which indicates 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 photography lens provided in Example 1 can achieve good imaging quality.

[0103] Example 2

[0104] The following reference Figure 3 The optical photographic 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.

[0105] like Figure 3As shown, the optical photography 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.

[0106] The parameters such as the radius of curvature, center thickness, and spacing distances between lenses and high-order coefficients of the optical photographic 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 photographic 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 photographic lens of embodiment 2 of the present application is as follows: FIG. 4A to FIG. 4C shown.

[0107] Example 3

[0108] The following reference Figure 5 An optical photographic lens according to Example 3 of the present application is described.

[0109] like Figure 5 As shown, the optical photography 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.

[0110] 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 convex. The third lens E3 has negative focal power, and its object side surface S5 is concave, 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 convex. 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 photography lens also includes a filter (not shown) arranged between the sixth lens E6 and the imaging surface S15.

[0111] Table 3 shows the basic parameters of the optical photography lens of Example 3, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0112]

[0113]

[0114] Table 3

[0115] 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 .

[0116] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.6170E-02 -2.1241E-03 -3.5802E-04 5.2073E-05 -2.3309E-05 3.5099E-06 -6.8582E-07 S2 -7.7642E-02 -6.2565E-04 -9.4797E-04 4.9943E-04 1.8637E-05 3.4840E-05 -2.2734E-05 S3 -9.2707E-02 1.7114E-03 4.1590E-05 8.1269E-04 1.2446E-04 8.8510E-06 -6.1600E-05 S4 -1.4388E-01 7.0718E-03 1.2640E-03 1.1756E-03 7.4200E-05 -7.0329E-05 -1.2665E-04 S5 -2.3306E-01 5.6188E-03 5.2028E-03 2.4815E-03 -3.8868E-05 -3.3847E-04 -2.7137E-04 S6 -2.6599E-01 2.4027E-03 3.7097E-03 1.6213E-03 -2.0480E-04 -8.5022E-05 -1.0005E-04 S7 -1.6972E-01 1.6766E-02 -2.3404E-03 -2.9890E-04 -1.3817E-03 -3.6781E-04 -6.7136E-05 S8 -3.4259E-01 9.2713E-02 -7.1229E-03 1.8390E-03 -1.2398E-03 -5.3514E-04 -2.7547E-06 S9 -2.8363E-01 -1.1088E-01 3.4395E-02 -5.7567E-03 2.8551E-03 2.1319E-04 1.8255E-04 S10 1.0996E-02 -1.8596E-01 5.8514E-02 -2.3669E-02 6.2459E-03 -1.3467E-04 2.3709E-04 S11 -1.0922E+00 3.1240E-01 -9.2670E-02 2.5297E-02 -9.7801E-03 3.3313E-03 -5.2671E-04 S12 -2.4205E+00 4.2898E-01 -1.0141E-01 3.8551E-02 -1.8789E-02 5.0801E-03 -2.2455E-03

[0117] Table 4-1

[0118] Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.7033E-06 -1.4070E-06 -1.5271E-06 -1.1857E-06 -1.1220E-06 -5.7658E-07 -3.4728E-07 S2 -2.4303E-05 -1.3713E-05 -4.8652E-06 -3.8412E-07 4.6424E-07 4.4707E-07 -6.2720E-08 S3 -4.6630E-05 -1.6590E-05 1.6872E-06 6.7959E-06 5.4476E-06 2.9461E-06 9.5808E-07 S4 -7.0381E-05 -2.5767E-05 -4.7851E-06 7.3640E-07 1.6788E-06 8.6432E-07 3.6174E-07 S5 -9.3265E-05 -1.8384E-06 1.0200E-05 -1.0141E-06 -5.6577E-06 -3.8495E-06 -9.1241E-07 S6 -2.7785E-05 1.1987E-05 1.5241E-05 5.4732E-06 1.9284E-06 1.9528E-07 3.6411E-07 S7 8.9414E-06 2.9354E-05 4.0261E-05 1.9673E-05 8.3498E-06 2.5055E-06 1.7065E-06 S8 4.1105E-05 -2.9664E-05 4.9637E-05 -1.1364E-05 5.6918E-07 -1.1202E-05 -9.0653E-08 S9 -7.6471E-06 -2.7685E-04 -6.3898E-05 1.6611E-05 3.1550E-05 9.8893E-06 8.1372E-06 S10 3.0996E-04 -2.8255E-04 2.3605E-04 7.6206E-05 4.9365E-05 3.3088E-05 -1.3050E-05 S11 8.0710E-04 -5.4413E-04 -7.0721E-05 1.6122E-04 7.1861E-05 -2.1619E-05 -2.4256E-05 S12 1.8202E-03 -4.6635E-04 -1.6613E-05 -2.1162E-04 5.5433E-05 3.1684E-05 2.6400E-05

[0119] Table 4-2

[0120] Fig. 7A The axial chromatic aberration curve of the optical photography lens of Example 3 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 7B The astigmatism curve of the optical photographic lens of Example 3 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 7C The chromatic aberration curve of the optical photography lens of Example 3 is shown, which indicates 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 photography lens provided in Example 3 can achieve good imaging quality.

[0121] Example 4

[0122] The following reference Figure 6 An optical photographic lens according to Example 4 of the present application is described.

[0123] like Figure 6 As shown, the optical photography lens comprises a lens barrel, a lens group and at least one spacer element contained in the lens barrel P0. 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.

[0124] The parameters such as the curvature radius, center thickness, and spacing distances between lenses and high-order coefficients of the optical photographic 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 photographic 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 photographic lens of embodiment 4 of the present application is as follows: 7A to 7C shown.

[0125] Example 5

[0126] The following reference Figure 8 An optical photographic lens according to Example 5 of the present application is described.

[0127] like Figure 8 As shown, the optical photography 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.

[0128] 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 convex. The third lens E3 has negative focal power, and its object side surface S5 is concave, 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 convex. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave.

[0129] Table 5 shows the basic parameters of the optical photography lens of Example 5, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0130]

[0131]

[0132] Table 5

[0133] 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 .

[0134] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.5417E-02 -3.8899E-03 -6.8641E-04 2.2279E-04 -1.1259E-04 7.3286E-05 -3.6089E-05 S2 -9.3484E-02 -1.3568E-04 -5.9978E-04 7.0731E-04 3.5319E-05 3.9969E-05 3.9672E-05 S3 -1.1851E-01 4.1660E-03 1.0634E-03 1.2371E-03 -7.6491E-05 -1.6070E-05 1.6308E-05 S4 -1.8929E-01 1.4324E-02 2.0850E-03 -6.9600E-04 -1.3647E-03 -2.6313E-04 2.2374E-04 S5 -2.6920E-01 1.3838E-02 9.0196E-03 -8.1225E-04 -2.2171E-03 2.0920E-04 1.0940E-03 S6 -3.0450E-01 3.4383E-03 9.9730E-03 3.6170E-04 -1.7208E-03 2.2370E-04 1.4713E-03 S7 -1.5740E-01 1.5253E-02 6.4750E-04 -5.5526E-04 -2.6348E-03 -1.9896E-04 9.2690E-04 S8 -3.7144E-01 8.2210E-02 -8.0940E-03 2.3769E-03 -2.0205E-04 -5.3172E-04 9.4962E-04 S9 -1.9490E-01 -7.9306E-02 2.8576E-02 -1.6461E-02 6.0951E-03 -1.5657E-03 6.6811E-04 S10 8.8462E-02 -1.8091E-01 6.0146E-02 -2.0694E-02 4.4572E-03 -5.3416E-03 2.5802E-03 S11 -1.5548E+00 1.2015E-01 1.2544E-01 1.9433E-02 -2.2508E-02 -6.3924E-03 1.6255E-02 S12 -2.5055E+00 3.2746E-01 -3.4778E-02 1.6603E-02 -5.9699E-03 9.2611E-03 5.1330E-03

[0135] Table 6-1

[0136] Face number A18 A20 A22 A24 A26 A28 A30 S1 3.7826E-05 -1.1450E-05 2.3337E-05 -6.0550E-06 1.0842E-05 -6.3894E-06 9.0878E-06 S2 5.4523E-05 3.3072E-05 1.7229E-05 2.7450E-06 -5.0891E-06 -3.1354E-06 -7.7124E-06 S3 4.1073E-05 -3.3703E-05 -3.5631E-05 -2.8140E-05 6.0722E-06 7.5998E-06 9.1946E-06 S4 1.8954E-04 5.3532E-06 -7.0382E-05 -4.7651E-05 -5.6513E-06 1.6616E-05 1.4374E-05 S5 3.6872E-04 -2.3164E-04 -1.6573E-04 -2.2639E-05 4.9358E-05 1.6696E-05 2.1760E-05 S6 3.1030E-05 -3.9983E-04 -2.6221E-04 -1.2686E-04 -9.3600E-05 -5.8299E-05 -2.4038E-05 S7 -3.2981E-04 5.9499E-06 5.5937E-04 3.7120E-04 1.0955E-04 1.0037E-06 2.3139E-05 S8 -3.7295E-04 6.4427E-04 3.7571E-04 -1.3677E-04 -3.0039E-04 -1.7738E-04 -5.2172E-05 S9 -9.1087E-04 3.8942E-04 -5.2680E-04 -1.8561E-04 7.4215E-04 7.2578E-04 2.2793E-04 S10 1.0267E-03 1.7642E-04 8.0466E-05 1.4921E-03 1.0717E-03 -3.3288E-05 -2.1582E-04 S11 3.0684E-03 -8.1636E-03 -3.8226E-03 5.4077E-03 7.2656E-03 3.8370E-03 9.2034E-04 S12 -5.8875E-03 -1.8287E-03 3.0045E-03 4.4042E-03 1.5486E-03 1.7295E-04 -1.4708E-04

[0137] Table 6-2

[0138] Fig. 10A The axial chromatic aberration curve of the optical photography lens of Example 5 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig. 10B The astigmatism curve of the optical photographic lens of Example 5 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig. 10C The chromatic aberration curve of the optical photographic 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 photography lens provided in Example 5 can achieve good imaging quality.

[0139] Example 6

[0140] The following reference Fig. 9 An optical photographic lens according to Example 6 of the present application is described.

[0141] like Fig. 9As shown, the optical photography 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.

[0142] The parameters such as the curvature radius, center thickness, and spacing distances between lenses and high-order coefficients of the optical photographic 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 photographic 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 photographic lens of embodiment 6 of the present application is as follows: FIG. 10A to FIG. 10C shown.

[0143] Table 7 below shows some parameters of the optical photography 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).

[0144] Parameter value / example 1 2 3 4 5 6 f1 -78.11 -78.11 -37.46 -37.46 -32.00 -32.00 f2 8.94 8.94 8.04 8.04 7.72 7.72 f3 9.30 9.30 9.90 9.90 7.32 7.32 f4 -94.80 -94.80 -12.92 -12.92 -7.51 -7.51 f5 2.64 2.64 4.57 4.57 2.77 2.77 f6 -3.86 -3.86 -5.93 -5.93 -6.92 -6.92 f12 10.93 10.93 11.21 11.21 11.26 11.26 f45 2.82 2.82 7.38 7.38 4.77 4.77 f56 4.07 4.07 9.75 9.75 3.33 3.33

[0145] Table 7

[0146] The following Table 8 shows some basic parameters of the lens barrel and spacer elements of the optical photographic lens of Examples 1 to 6, such as d1s, d1m, D1s, d2s, d2m, D2m, EP01, EP23, EP45, EP56, CP5 and L.

[0147] The units of the basic parameters listed in Table 8 are all millimeters (mm).

[0148]

[0149]

[0150] Table 8 In summary, in Examples 1 to 6, the optical photography lenses respectively meet the conditions in Table 9 below.

[0151]

[0152]

[0153] Table 9

[0154] FIG. 11A to FIG. 13 The defocus curves and relative illumination curves of Sample 1 and Sample 2 of the optical photographic lens, and the defocus curve of Sample 3 are shown respectively.

[0155] According to the sample 1 of the optical photographic lens, R6 / R5=1.81, f3 / d3s=3.54. Fig.11A and Fig. 11B From the above, when the optical photographic lens satisfies the numerical ranges of 1.5<R6 / R5<2.0 and 3.0<f3 / d3s<4.2, the focus offset of the defocus curve of the optical photographic lens is very small and has a high relative illumination.

[0156] According to the sample 2 of the optical photographic lens, R6 / R5=2.17, f3 / d3s=5.65. Fig. 12A and Fig. 12B From the above, it can be seen that when the optical photographic lens exceeds the upper limit of the numerical range of the conditional formulas 1.5<R6 / R5<2.0 and 3.0<f3 / d3s<4.2, the optical photographic lens has focus shift; in addition, when the inner diameter d3s of the object side of the third spacer element is too small, excessive light blocking will affect the illumination, and the relative illumination RI will decrease.

[0157] According to sample 3 of the optical photographic lens, R6 / R5=1.42, f3 / d3s=2.67. Fig.13 From the above, when the optical photographic lens is below the lower limit of the numerical range of the conditional formula 1.5<R6 / R5<2.0 and 3.0<f3 / d3s<4.2, the inner diameter d3s of the object side of the third spacer element is too large, which will lead to a worse effect of blocking excess light, and the optical photographic lens also has a more serious focus offset.

[0158] FIG. 14A to FIG. 14C FIG. 2 shows a schematic diagram of stray light according to sample 2 of an optical photography lens. In order to meet the requirements of high resolution and good imaging quality for lenses used in terminal electronic devices, the lens needs to have small field curvature and low dispersion, and high relative illumination. However, while meeting these requirements, the third lens is also more sensitive, and the structure is prone to stray light, such as Fig.14A and Fig. 14B When the upper limit of the value range of 1.5<R6 / R5<2.0 and 3.0<f3 / d3s<4.2 is exceeded, such as Fig. 14C As shown, a ghost image appears in the upper part of the image, thus affecting the image quality.

[0159] Fig.15The schematic diagram of stray light according to the optical photographic lens sample 1 is shown. When the optical photographic lens satisfies the numerical ranges of 1.5<R6 / R5<2.0 and 3.0<f3 / d3s<4.2, the effect of eliminating stray light is better.

[0160] Through the above experimental comparisons of different samples of optical photographic lenses, it can be found that when the optical photographic lens meets the numerical ranges of 1.5<R6 / R5<2.0 and 3.0<f3 / d3s<4.2, the effect of intercepting stray light is better; when it exceeds this numerical range, stray light is likely to appear or the relative illumination will be affected.

[0161] The following Table 10 shows the experimental comparison results of Sample 1, Sample 2 and Sample 3 of the optical photographic lens.

[0162]

[0163] Table 10

[0164] Therefore, by making the optical photography lens satisfy the numerical range of the conditional formula 1.5<R6 / R5<2.0 and 3.0<f3 / d3s<4.2, 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 third lens and improving the stray light in the third lens structure area.

[0165] 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 photographic 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 having optical power, a second lens having optical power, a third lens having optical power, a fourth lens having optical power, a fifth lens having optical power and a sixth lens having 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 third spacer element located between the third lens and the fourth lens and in direct contact with the image side of the third lens; Wherein, a curvature radius R5 of the object side surface of the third lens and a curvature radius R6 of the image side surface of the third lens satisfy: 1.5<R6 / R5<2.0; and The effective focal length f3 of the third lens and the inner diameter d3s of the object side surface of the third spacing element satisfy: 3.2<f3 / d3s<4.

2.

2. The optical photographic 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, A curvature radius R10 of the image-side surface of the fifth lens, a refractive index N5 of the fifth lens, and an inner diameter d5s of the object-side surface of the fifth spacer element satisfy: -75.0<R10*N5 / d5s<-18.

0.

3. The optical photographic lens according to claim 1, wherein: The at least one spacer element further comprises 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 interval EP01 between the front end surface of the lens barrel and the first spacer element, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 3.5<(EP01+CT2) / CT1<5.

0.

4. The optical photographic lens according to claim 1, wherein: The at least one spacer element further comprises 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, and 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 interval EP12 between the first spacing element and the second spacing element, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 0.9<EP12 / CT2<1.1; 1.4<CT2 / CT1≤2.

3.

5. The optical photographic 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 effective focal length f2 of the second lens, the refractive index N2 of the second lens, and the inner diameter d2s of the object-side surface of the second spacer element satisfy: 5.5<f2*N2 / d2s<6.

5.

6. The optical photographic 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, the outer diameter D2m of the image side surface of the second spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy: 7.0<f12 / (D2m-d2m)<17.

5.

7. The optical photographic 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 air gap T23 between the second lens and the third lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, and the gap EP23 between the second spacer element and the third spacer element satisfy: 1.5<(T23+CT3+T34) / EP23<2.

0.

8. The optical photographic 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, The interval EP45 between the fourth spacing element and the fifth spacing element, the maximum thickness CP5 of the fifth spacing element, and the center thickness CT5 of the fifth lens on the optical axis satisfy: 1.5<(EP45+CP5) / CT5<2.

5.

9. The optical photographic lens according to claim 1, wherein: The at least one spacing element further includes 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, and a sixth spacing element located on the image side of the sixth lens and in direct contact with the image side of the sixth lens, An air interval T56 between the fifth lens and the sixth lens on the optical axis and an interval EP56 between the fifth spacing element and the sixth spacing element satisfy: 0.9<T56 / EP56<2.

1.

10. The optical photographic lens according to claim 1, wherein: The at least one spacer element further comprises 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 curvature radius R1 of the object-side surface of the first lens, the inner diameter d1s of the object-side surface of the first spacer element, and the inner diameter d1m of the image-side surface of the first spacer element satisfy: 31.0<R1 / (d1s-d1m)<33.

5.

11. The optical photographic lens according to claim 1, wherein: The at least one spacer element further comprises 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, and 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 interval EP12 between the first spacing element and the second spacing element and the interval EP01 between the front end surface of the lens barrel and the first spacing element satisfy the following: 0.5<EP12 / EP01<1.

0.

12. The optical photographic 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, 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, an outer diameter D4s of the object side surface of the fourth spacing element, and an outer diameter D4m of the image side surface of the fourth spacing element satisfy: 1.5<D4s / R7+D4m / R8≤2.

5.

13. The optical photographic 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, A curvature radius R9 of the object-side surface of the fifth lens, a refractive index N5 of the fifth lens, and an outer diameter D5s of the object-side surface of the fifth spacer element satisfy: 0.4<R9*N5 / D5s<0.

6.

14. The optical photographic 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 and the inner diameter d5m of the image-side surface of the fifth spacing element satisfy: -3.5<f6 / d5m<-0.

9.

15. The optical photographic lens according to claim 1 or 3, wherein: The maximum height L of the lens barrel along the optical axis and the sum ΣCT of the center thicknesses of all lenses in the lens group on the optical axis satisfy: 1.6<L / ΣCT<1.

8.

16. The optical photographic lens according to claim 1 or 6, wherein: The outer diameter D3s of the object side surface of the third spacing element, the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens and the outer diameter D3m of the image side surface of the third spacing element satisfy: 1.7<D3s / R5+D3m / R6<2.

9.

17. The optical photographic 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, The combined focal length f45 of the fourth lens and the fifth lens, the outer diameter D4s of the object side surface of the fourth spacing element, and the inner diameter d4s of the object side surface of the fourth spacing element satisfy: 2.0<f45 / (D4s-d4s)<6.

5.

18. The optical photographic 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, A combined focal length f56 of the fifth lens and the sixth lens and an outer diameter D5m of the image-side surface of the fifth spacer element satisfy the following: 0.8<f56 / D5m<2.

4.

19. The optical photographic 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 curvature radius R10 of the image-side surface of the fifth lens, and the inner diameter d5s of the object-side surface of the fifth spacing element satisfy: 1.1<f5 / R10+f5 / d5s<3.

0.

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

Images