Optical lens

Abstract

The embodiment of the utility model discloses an optical lens, and the lens comprises a seven-piece lens group which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from the object side to the image side along an optical axis; a spacer group including a first spacer between the first lens and the second lens and in direct contact with an image side surface of the first lens; and a lens barrel in which the seven-piece lens group and the spacer group are accommodated; wherein the outer diameter D1s of the object side surface of the first spacer, the effective focal length f1 of the first lens and the curvature radius R2 of the image side surface of the first lens meet the following conditions: f1 is less than 0; r2 < 0; -2.5 < D1s / R2 + D1s / f1 <-1.8.

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, with the rapid development and continuous updating and iteration of mobile electronic devices, as well as the improvement of users' requirements for the imaging quality of built-in optical lenses of electronic devices, the continuous iteration and upgrading of optical imaging lenses has also been driven. With the continuous increase in the memory of electronic devices such as mobile phones and the high requirements of users for imaging quality, the imaging quality of optical lenses, such as high definition and high picture cleanliness (the less stray light and ghosting, the higher the picture cleanliness), has gradually become one of the important factors for users to choose electronic products. However, the requirements of high pixels and large image surfaces have led to an increasing number of lens pieces, more and more mechanisms and components for support and installation, and more and more components that can generate stray light. For example, the unreasonable design of the front and rear end dimensions of the lens barrel and the unreasonable matching of the lenses will easily generate stray light, which is contrary to the requirements of high pixels and high definition. In addition, in order to meet the design requirements, the first lens is negative and its image side is convex, but this design will cause the first lens structure to be more likely to generate stray light and ghosting, affecting the imaging quality.

[0003] Therefore, a more reasonable optical lens needs to be designed to meet the requirements for high pixels, high definition and picture cleanliness. Utility Model Content

[0004] An embodiment of the present application provides an optical lens, which includes: a seven-piece lens group, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the object side to the image side along the optical axis; a spacer group, including a first spacer, the first spacer is located between the first lens and the second lens and is in direct contact with the image side surface of the first lens; and a lens barrel, in which the seven-piece lens group and the spacer group are accommodated; wherein the outer diameter D1s of the object side surface of the first spacer, the effective focal length f1 of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: f1<0; R2<0; -2.5<D1s / R2+D1s / f1<-1.8.

[0005] In one or more embodiments, the object side surface of the first lens has an inflection point; the interval EP01 between the front end face of the lens barrel and the first spacer along the optical axis, the on-axis distance SAG12 from the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens, and the on-axis distance SAG21 from the intersection of the object side surface of the second lens and the optical axis to the effective radius vertex of the object side surface of the second lens satisfy: 1.0<EP01 / (SAG12+SAG21)<1.5.

[0006] In one or more embodiments, the outer diameter D1s of the object side surface of the first spacer, the inner diameter d1s of the object side surface of the first spacer, the maximum effective radius DT11 of the object side surface of the first lens, and the maximum effective radius DT12 of the image side surface of the first lens satisfy: 3.4<(D1s-d1s) / (DT11-DT12)<5.1.

[0007] In one or more embodiments, the spacer group also includes a second spacer located between the second lens and the third lens and in direct contact with the image side surface of the second lens. The effective focal length f2 of the second lens, the refractive index N2 of the second lens, and the interval EP12 between the first spacer and the second spacer along the optical axis satisfy: 68.0<f2*N2 / EP12<80.0.

[0008] In one or more embodiments, the spacer group also includes a second spacer located between the second lens and the third lens and in direct contact with the image side surface of the second lens, and the maximum thickness CP1 of the first spacer, the maximum thickness CP2 of the second spacer, the center thickness CT2 of the second lens on the optical axis, and the air spacing T23 between the second lens and the third lens on the optical axis satisfy: 27.0<CT2 / CP1+T23 / CP2<43.5.

[0009] In one or more embodiments, the spacer group also includes a second spacer located between the second lens and the third lens and in direct contact with the image side surface of the second lens, and the combined focal length f23 of the second lens and the third lens, the outer diameter D2s of the object side surface of the second spacer, and the inner diameter d2s of the object side surface of the second spacer satisfy: 1.0<f23 / (D2s-d2s)<2.5.

[0010] In one or more embodiments, the spacer group also includes a third spacer located between the third lens and the fourth lens and in direct contact with the image side surface of the third lens, and the outer diameter D3s of the object side surface of the third spacer, the inner diameter d3s of the object side surface of the third spacer, the effective focal length f3 of the third lens, and the curvature radius R7 of the object side surface of the fourth lens satisfy: 7.0≤R7 / d3s+f3 / D3s≤10.0.

[0011] In one or more embodiments, the spacer group also includes a third spacer located between the third lens and the fourth lens and in direct contact with the image side surface of the third lens, and a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image side surface of the fourth lens. The center thickness CT4 of the fourth lens on the optical axis, the air gap T45 between the fourth lens and the fifth lens on the optical axis, and the gap EP34 between the third spacer and the fourth spacer along the optical axis satisfy: 1.0<(CT4+T45) / EP34<1.8.

[0012] In one or more embodiments, the spacer group also includes a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image side surface of the fourth lens. The effective focal length f4 of the fourth lens, the refractive index N4 of the fourth lens, and the outer diameter D4s of the object side surface of the fourth spacer satisfy: 0.5<f4*N4 / D4s<1.0.

[0013] In one or more embodiments, the spacer group also includes a third spacer located between the third lens and the fourth lens and in direct contact with the image side surface of the third lens, and a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image side surface of the fourth lens. The inner diameter d4s of the object side surface of the fourth spacer, the inner diameter d3m of the image side surface of the third spacer, the maximum effective radius DT32 of the image side surface of the third lens, and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: 1.0<(d4s / d3m) / (DT42 / DT32)<1.5.

[0014] In one or more embodiments, the spacer group also includes a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image side surface of the fourth lens, and a fifth spacer located between the fifth lens and the sixth lens and in direct contact with the image side surface of the fifth lens. The outer diameter D5s of the object side surface of the fifth spacer, the outer diameter D4m of the image side surface of the fourth spacer, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 0.1<(D5s-D4m) / T56<5.6.

[0015] In one or more embodiments, the spacer group also includes a sixth spacer located between the sixth lens and the seventh lens and in direct contact with the image side surface of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, and the maximum thickness CP6 of the sixth spacer satisfy: 9.5<CT6 / T67+CT6 / CP6<11.0.

[0016] In one or more embodiments, the spacer group also includes a sixth spacer located between the sixth lens and the seventh lens and in direct contact with the image side surface of the sixth lens, and the effective focal length f7 of the seventh lens, the inner diameter d6m of the image side surface of the sixth spacer, and the inner diameter d6s of the object side surface of the sixth spacer satisfy: -2.0<f7 / (d6m-d6s)<-1.5.

[0017] In one or more embodiments, the spacer group also includes a fifth spacer located between the fifth lens and the sixth lens and in direct contact with the image side surface of the fifth lens, and a sixth spacer located between the sixth lens and the seventh lens and in direct contact with the image side surface of the sixth lens. The curvature radius R9 of the object side surface of the fifth lens, the curvature radius R11 of the object side surface of the sixth lens, the inner diameter d5s of the object side surface of the fifth spacer, and the inner diameter d6s of the object side surface of the sixth spacer satisfy: 1.3<(R9*d5s) / (R11*d6s)<1.5.

[0018] In one or more embodiments, half of the maximum field of view Semi-FOV of the optical lens, the total effective focal length f of the optical lens, and the inner diameter d0s of the front end surface of the lens barrel closest to the object side satisfy: 0.4<TAN(Semi-FOV)*f / d0s<0.6.

[0019] In one or more embodiments, the second lens has positive optical power, its object side surface is convex, and its image side surface is concave; the third lens has positive optical power, its image side surface is convex; the fourth lens has positive optical power, its object side surface is convex, and its image side surface is convex; the fifth lens has negative optical power, its object side surface is convex, and its image side surface is concave; the sixth lens has positive optical power, its object side surface is concave, and its image side surface is convex; and the seventh lens has negative optical power, its object side surface is convex, and its image side surface is concave.

[0020] The embodiment of the present application provides an optical lens, including seven lenses for imaging and a spacer group, wherein the first lens has a negative optical focal length and its image side surface is a convex surface. By optimizing the design of the optical system structure and making the optical lens satisfy the conditional formula -2.5<D1s / R2+D1s / f1<-1.8, the outer diameter of the first spacer and the curvature radius and the effective focal length of the first lens are controlled, so that the optical system's ability to converge light can be improved while adjusting the field curvature, the imaging clarity can be improved, the matching degree between the lens edge field of view CRA (chief light angle) and the chip CRA can be improved, and the risk of color cast can be reduced; in addition, the problems of defocus, chromatic aberration and distortion caused by air spacing can be effectively eliminated, and at the same time, it is beneficial to improve the optical performance, reduce stray light spots, and improve the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Figure 1A and Figure 1B A schematic diagram showing the structure and some parameters of an optical lens according to an embodiment of the present application is shown;

[0023] Figure 2A schematic structural diagram of an optical lens according to Embodiment 1 of the present application is shown;

[0024] Figure 3 A schematic structural diagram of an optical lens according to Embodiment 2 of the present application is shown;

[0025] 4A to 4D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical lens according to Example 1 and Example 2 of the present application are respectively shown;

[0026] Figure 5 A schematic structural diagram of an optical lens according to Embodiment 3 of the present application is shown;

[0027] Figure 6 A schematic structural diagram of an optical lens according to Embodiment 4 of the present application is shown;

[0028] FIG. 7A to FIG. 7D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical lenses according to Example 3 and Example 4 of the present application are respectively shown;

[0029] Figure 8 A schematic structural diagram of an optical lens according to Embodiment 5 of the present application is shown;

[0030] Fig. 9 A schematic structural diagram of an optical lens according to Embodiment 6 of the present application is shown;

[0031] FIG. 10A to FIG. 10D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical lenses according to Example 5 and Example 6 of the present application are respectively shown;

[0032] Fig.11A and 11B A schematic diagram showing the effect of eliminating stray light according to the optical lenses of Sample 2 and Sample 1 of the present application; and

[0033] Fig. 12A and 12B A schematic diagram showing the effect of eliminating stray light by the optical lenses of Sample 3 and Sample 1 of the present application is shown. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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 thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. For example, the lens groups, lens barrel structures and spacers in the embodiments of the present application can be combined arbitrarily, and are not limited to the lens groups in one embodiment can only be combined with the lens barrel structure, spacers, etc. of the embodiment.

[0041] The features, principles and other aspects of the present application are described in detail below.

[0042] Figure 1A and Figure 1B Schematic diagram of the structure arrangement of the optical lens and some parameters according to an exemplary embodiment of the present application. Figure 1A and Figure 1B , CP1 represents the maximum thickness of the fifth spacer, CP6 represents the maximum thickness of the sixth spacer, d0s represents the inner diameter of the object side end face of the lens barrel, EP01 represents the distance between the front end face of the lens barrel (the end face closest to the object side) and the first spacer along the optical axis, EP12 represents the distance between the first spacer and the second spacer along the optical axis, EP34 represents the distance between the third spacer and the fourth spacer along the optical axis, SAG12 represents the on-axis distance from the intersection of the image side face of the first lens and the optical axis to the vertex of the effective radius of the image side face of the first lens, and SAG21 represents the object side face of the second lens. The axial distance between the intersection of the surface and the optical axis and the vertex of the effective radius of the object side of the second lens, DT32 represents the maximum effective radius of the image side of the third lens, DT42 represents the maximum effective radius of the image side of the fourth lens, D1s represents the outer diameter of the object side of the first spacer, d1s represents the inner diameter of the object side of the first spacer, D2s represents the outer diameter of the object side of the second spacer, d2s represents the inner diameter of the object side of the second spacer, D4m represents the outer diameter of the image side of the fourth spacer, d6m represents the inner diameter of the image side of the sixth spacer, and so on.

[0043] refer to Figures 2 to 3 , Figures 5 and 6 as well as Figures 8 to 9In a first aspect of the present application, an optical lens is provided. The optical lens may include a seven-piece lens group for imaging. The seven-piece lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side along the optical axis. Among the first lens to the seventh lens, any two adjacent lenses may have an air gap between them. As an example, the first lens, the fifth lens, and the seventh lens may have negative optical power, and the second lens, the third lens, the fourth lens, and the sixth lens may have positive optical power.

[0044] In an exemplary embodiment, the object side surface of the first lens may be a concave surface, and the image side surface may be a convex surface. The object side surface of the second lens may be a convex surface, and the image side surface may be a concave surface. The object side surface of the third lens may be a concave surface or a convex surface, and the image side surface may be a convex surface. Both the object side surface and the image side surface of the fourth lens may be convex surfaces. The object side surface of the fifth lens may be a convex surface, and the image side surface may be a concave surface. The object side surface of the sixth lens may be a concave surface, and the image side surface may be a convex surface. The object side surface of the seventh lens may be a convex surface, and the image side surface may be a concave surface.

[0045] In an exemplary embodiment, the optical lens may further include a spacer group, and the spacer group may include one or more of a first spacer, a second spacer, a third spacer, a fourth spacer, a fifth spacer, and a sixth spacer. The first spacer may be located between the first lens and the second lens and at least partially contact the image side of the first lens. The second spacer may be located between the second lens and the third lens and at least partially contact the image side of the second lens. The third spacer may be located between the third lens and the fourth lens and at least partially contact the image side of the third lens. The fourth spacer may be located between the fourth lens and the fifth lens and at least partially contact the image side of the fourth lens. The fifth spacer may be located between the fifth lens and the sixth lens and at least partially contact the image side of the fifth lens. The sixth spacer may be located between the sixth lens and the seventh lens and at least partially contact the image side of the sixth lens. Exemplarily, the spacer 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, it is beneficial to block stray light, reduce interference with image quality, improve the imaging quality of the optical lens, and improve the assembly stability of the optical lens.

[0046] In an exemplary embodiment, the optical lens may further include a lens barrel having an accommodation space, and the seven-piece lens group and the spacer group may be accommodated in the lens barrel.

[0047] In an exemplary embodiment, the spacer group includes a first spacer located between the first lens and the second lens and in direct contact with the image side surface of the first lens, and the outer diameter D1s of the object side surface of the first spacer, the effective focal length f1 of the first lens, and the curvature radius R2 of the image side surface of the first lens can satisfy: f1<0; R2<0; -2.5<D1s / R2+D1s / f1<-1.8. By setting the first lens to have negative optical power, its image side surface is convex, and by satisfying -2.5<D1s / R2+D1s / f1<-1.8, the curvature radius of the first lens and the effective focal length of the first lens are controlled, the optical system can be improved in focusing light while adjusting the field curvature, improve the imaging clarity, and improve the matching degree between the lens edge field of view CRA and the chip CRA, and reduce the risk of color cast; in addition, satisfying this conditional expression can also effectively eliminate the problems of defocus, chromatic aberration and distortion caused by air spacing, and at the same time, it is beneficial to improve optical performance, reduce stray light spots, and improve imaging quality.

[0048] In an exemplary embodiment, the object side surface of the first lens has an inflection point, and the interval EP01 between the front end surface of the lens barrel and the first spacer along the optical axis, the on-axis distance SAG12 from the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens, and the on-axis distance SAG21 from the intersection of the object side surface of the second lens and the optical axis to the effective radius vertex of the object side surface of the second lens satisfy: 1.0<EP01 / (SAG12+SAG21)<1.5. By satisfying this conditional expression, the smoothness and formability of the effective surface of the first lens (the aspherical surface for transmitting effective light) can be improved, ensuring that the first lens does not have a large curved surface shape, improving the stability of the lens during assembly, reducing assembly deformation, and improving imaging quality.

[0049] In an exemplary embodiment, the outer diameter D1s of the object side surface of the first spacer, the inner diameter d1s of the object side surface of the first spacer, the maximum effective radius DT11 of the object side surface of the first lens, and the maximum effective radius DT12 of the image side surface of the first lens satisfy: 3.4<(D1s-d1s) / (DT11-DT12)<5.1. By satisfying this conditional expression, the refraction angle of the system light in the first lens and the maximum incident angle of the system light can be effectively controlled, which is beneficial to improving the external field illumination and the size of the imaging surface. At the same time, by controlling the inner and outer diameters of the first spacer, it is beneficial to improve the assembly stability of the lens, improve the stray light state, and improve the imaging quality and reliability of the lens.

[0050] In an exemplary embodiment, the spacer group also includes a second spacer located between the second lens and the third lens and in direct contact with the image side surface of the second lens. The effective focal length f2 of the second lens, the refractive index N2 of the second lens, and the interval EP12 between the first spacer and the second spacer along the optical axis satisfy: 68.0<f2*N2 / EP12<80.0. Satisfying this conditional expression can reduce the dispersion phenomenon of the second lens and improve the pixel of the imaging lens; at the same time, by satisfying this conditional expression, the edge thickness of the second lens and the effective focal length of the second lens can be controlled, which is conducive to balancing the rear focal length of the optical system, and a relatively stable imaging focal plane position can be achieved in the optical system, increasing the stability of the lens during use.

[0051] In an exemplary embodiment, the spacer group further includes a second spacer located between the second lens and the third lens and in direct contact with the image side surface of the second lens, and the maximum thickness CP1 of the first spacer, the maximum thickness CP2 of the second spacer, the center thickness CT2 of the second lens on the optical axis, and the air interval T23 between the second lens and the third lens on the optical axis satisfy: 27.0<CT2 / CP1+T23 / CP2<43.5. By satisfying this conditional expression, the center thickness of the second lens can be within a relatively reasonable range, and the maximum thickness of the second lens of the optical lens and the spacer at least partially in contact with the image side surface of the lens can be controlled to avoid assembly interference, and at the same time, it is more convenient to adjust the field curvature later.

[0052] In an exemplary embodiment, the spacer group further includes a second spacer located between the second lens and the third lens and in direct contact with the image side surface of the second lens, and the combined focal length f23 of the second lens and the third lens, the outer diameter D2s of the object side surface of the second spacer, and the inner diameter d2s of the object side surface of the second spacer satisfy: 1.0<f23 / (D2s-d2s)<2.5. By satisfying this conditional expression, it is helpful to improve the assembly stability of the front lens, improve the low yield problem caused by the matching amount, and help to reasonably distribute the optical power. By controlling the inner and outer diameters of the second spacer, the stray light state can be improved, and the imaging quality of the optical system can be improved.

[0053] In an exemplary embodiment, the spacer group also includes a third spacer located between the third lens and the fourth lens and in direct contact with the image side surface of the third lens. The outer diameter D3s of the object side surface of the third spacer, the inner diameter d3s of the object side surface of the third spacer, the effective focal length f3 of the third lens, and the curvature radius R7 of the object side surface of the fourth lens satisfy: 7.0≤R7 / d3s+f3 / D3s≤10.0. By satisfying this conditional expression, the light blocking efficiency of the third spacer can be effectively improved. Further, by controlling the inner and outer diameters of the third spacer to be within this range, the baking deformation and assembly eccentricity of the third spacer can be greatly reduced, and the generation of light leakage and stray light caused by spacer deformation and assembly eccentricity can be reduced. In addition, by satisfying this conditional expression, the smoothness and formability of the effective surface of the fourth lens can be improved, and the imaging quality can be improved.

[0054] In an exemplary embodiment, the spacer group further includes a third spacer located between the third lens and the fourth lens and in direct contact with the image side surface of the third lens, and a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image side surface of the fourth lens, and the center thickness CT4 of the fourth lens on the optical axis, the air interval T45 between the fourth lens and the fifth lens on the optical axis, and the interval EP34 between the third spacer and the fourth spacer along the optical axis satisfy: 1.0<(CT4+T45) / EP34<1.8. By satisfying this conditional expression, the center thickness and edge thickness of the fourth lens can be within a relatively reasonable range, reducing the risk of weld marks of the fourth lens during molding, thereby reducing the risk of stray light caused by weld marks, improving the cleanliness of lens imaging, reducing the demolding force when the plastic lens is demolded after molding, reducing the surface shape deviation from the design curve caused by lens demolding deformation, and improving the quality of the lens MTF (modulation transfer function).

[0055] In an exemplary embodiment, the spacer group also includes a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image side surface of the fourth lens. The effective focal length f4 of the fourth lens, the refractive index N4 of the fourth lens, and the outer diameter D4s of the object side surface of the fourth spacer satisfy: 0.5<f4*N4 / D4s<1.0. By satisfying this conditional expression, the smoothness and formability of the effective surface of the fourth lens (the aspherical surface for transmitting effective light) can be improved, ensuring that the fourth lens does not have a large curved surface shape, improving the stability of the lens during assembly, and reducing assembly deformation; at the same time, the amount of light passing through the fourth lens and the fifth lens is controlled to avoid the generation of stray light, thereby improving the imaging quality.

[0056] In an exemplary embodiment, the spacer group further includes a third spacer located between the third lens and the fourth lens and in direct contact with the image side surface of the third lens, and a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image side surface of the fourth lens, and the inner diameter d4s of the object side surface of the fourth spacer, the inner diameter d3m of the image side surface of the third spacer, the maximum effective radius DT32 of the image side surface of the third lens, and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: 1.0<(d4s / d3m) / (DT42 / DT32)<1.5. By satisfying this conditional expression, the smoothness and formability of the effective surfaces (aspherical surfaces for transmitting effective light) of the third and fourth lenses can be improved, ensuring that the third and fourth lenses do not have a large curved surface shape, improving the stability of the lens during assembly, reducing assembly deformation, and improving imaging quality; at the same time, the inner diameters of the third and fourth spacers can be controlled, which is conducive to improving the light blocking efficiency of the third and fourth spacers and reducing the risk of stray light.

[0057] In an exemplary embodiment, the spacer group also includes a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image side surface of the fourth lens, and a fifth spacer located between the fifth lens and the sixth lens and in direct contact with the image side surface of the fifth lens. The outer diameter D5s of the object side surface of the fifth spacer, the outer diameter D4m of the image side surface of the fourth spacer, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 0.1<(D5s-D4m) / T56<5.6. By satisfying this conditional expression, the outer diameter of the image side surface of the fourth spacer and the outer diameter of the object side surface of the fifth spacer are controlled to obtain a relatively stable aperture step difference. After the fourth spacer and the fifth spacer are assembled, a stable gap can be obtained to avoid the generation of excess stray light. In addition, the air gap between the fifth lens and the sixth lens on the optical axis can also be controlled to make the structure more reasonable, effectively avoid assembly interference, and improve imaging quality.

[0058] In an exemplary embodiment, the spacer group also includes a sixth spacer located between the sixth lens and the seventh lens and in direct contact with the image side surface of the sixth lens. The center thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, and the maximum thickness CP6 of the sixth spacer satisfy: 9.5<CT6 / T67+CT6 / CP6<11.0. By satisfying this conditional expression, the maximum thickness of the sixth spacer and the air gap at the location are controlled within the above range, which can ensure that the spacer will not be significantly deformed after assembly, and will not be significantly deformed during the high-temperature baking process, thereby improving the light blocking efficiency and reducing the risk of stray light; in addition, by controlling the center thickness of the sixth lens on the optical axis, the risk of the weld mark of the sixth lens can be effectively reduced, the weld mark stray light can be avoided, and the imaging quality can be improved.

[0059] In an exemplary embodiment, the spacer group further includes a sixth spacer located between the sixth lens and the seventh lens and in direct contact with the image side surface of the sixth lens, and the effective focal length f7 of the seventh lens, the inner diameter d6m of the image side surface of the sixth spacer, and the inner diameter d6s of the object side surface of the sixth spacer satisfy: -2.0<f7 / (d6m-d6s)<-1.5. By satisfying this conditional expression, the effective focal length of the seventh lens is controlled within a reasonable range, and the smoothness and formability of the effective surface of the seventh lens (the aspheric surface for transmitting effective light) can be improved; in addition, by controlling the object side and image side inner diameters of the sixth spacer, the cross-shaped stray light and the dragged stray light reflected by the inner diameter surface of the spacer can be reduced, thereby improving the imaging quality.

[0060] In an exemplary embodiment, the spacer group further includes a fifth spacer located between the fifth lens and the sixth lens and in direct contact with the image side surface of the fifth lens, and a sixth spacer located between the sixth lens and the seventh lens and in direct contact with the image side surface of the sixth lens. The curvature radius R9 of the object side surface of the fifth lens, the curvature radius R11 of the object side surface of the sixth lens, the inner diameter d5s of the object side surface of the fifth spacer, and the inner diameter d6s of the object side surface of the sixth spacer satisfy: 1.3<(R9*d5s) / (R11*d6s)<1.5. When this conditional expression is satisfied, by controlling the curvature radius of the object side surfaces of the fifth lens and the sixth lens, the processability of the fifth lens and the sixth lens can be improved, the surface deviation, distortion and appearance problems caused by molding can be reduced, and the production yield of the lens can be improved; in addition, by controlling the inner diameter of the object side surfaces of the fifth spacer and the sixth spacer, the stray light generated by the fifth lens and the sixth lens can be effectively blocked, the stray light can be avoided, and the imaging quality can be improved.

[0061] In an exemplary embodiment, half of the maximum field of view angle Semi-FOV of the optical lens, the total effective focal length f of the optical lens, and the inner diameter d0s of the front end surface of the lens barrel closest to the object side meet the following conditions: 0.4<TAN(Semi-FOV)*f / d0s<0.6. Meeting this conditional expression is beneficial to preventing the lens barrel from blocking incident light and generating stray light while forming a large viewing angle of the lens.

[0062] It should be understood that the present application does not specifically limit the number of spacers, and any number of spacers may be included between any two lenses, and the entire optical lens may also include any number of spacers. The spacers help the optical lens intercept excess refractive and reflective light paths and reduce stray light and ghosting. Adding auxiliary support between the spacer 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.

[0063] According to the second aspect of the present application, an optical lens is also provided, which includes a seven-piece lens group for imaging, and the seven-piece lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side along the optical axis. Among the first lens to the seventh lens, there may be an air gap between any two adjacent lenses. As an example, the first lens, the fifth lens, and the seventh lens may have negative optical power, and the second lens, the third lens, the fourth lens, and the sixth lens may have positive optical power.

[0064] In an exemplary embodiment, the object side surface of the first lens may be a concave surface, and the image side surface may be a convex surface. The object side surface of the second lens may be a convex surface, and the image side surface may be a concave surface. The object side surface of the third lens may be a concave surface or a convex surface, and the image side surface may be a convex surface. Both the object side surface and the image side surface of the fourth lens may be convex surfaces. The object side surface of the fifth lens may be a convex surface, and the image side surface may be a concave surface. The object side surface of the sixth lens may be a concave surface, and the image side surface may be a convex surface. The object side surface of the seventh lens may be a convex surface, and the image side surface may be a concave surface.

[0065] In an exemplary embodiment, the optical lens may further include a spacer group, which may include a third spacer located between the third lens and the fourth lens and in direct contact with the image side surface of the third lens, and a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image side surface of the fourth lens.

[0066] In an exemplary embodiment, the spacer group may also include one or more of a first spacer, a second spacer, a fifth spacer, and a sixth spacer. The first spacer may be located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens. The second spacer may be located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens. The fifth spacer may be located between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens. The sixth spacer may be located between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens. Exemplarily, the spacer 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, it is beneficial to block stray light, reduce interference with image quality, improve the imaging quality of the optical lens, and improve the assembly stability of the optical lens.

[0067] In an exemplary embodiment, the optical lens may further include a lens barrel having an accommodation space, and the seven-piece lens group and the spacer group may be accommodated in the lens barrel.

[0068] In an exemplary embodiment, the center thickness CT4 of the fourth lens on the optical axis, the air interval T45 between the fourth lens and the fifth lens on the optical axis, and the interval EP34 between the third spacer and the fourth spacer along the optical axis satisfy: 1.0<(CT4+T45) / EP34<1.8. By satisfying this conditional expression, the center thickness and edge thickness of the fourth lens can be within a relatively reasonable range, reducing the risk of weld marks during molding of the fourth lens, thereby reducing the risk of stray light caused by weld marks, improving the cleanliness of lens imaging, reducing the demolding force when the plastic lens is demolded after molding, reducing the deviation of the surface shape from the design curve caused by lens demolding deformation, and improving the quality of the lens MTF (modulation transfer function).

[0069] According to the third aspect of the present application, an optical lens is also provided, which includes a seven-piece lens group for imaging, and the seven-piece lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side along the optical axis. Among the first lens to the seventh lens, there may be an air gap between any two adjacent lenses. As an example, the first lens, the fifth lens, and the seventh lens may have negative optical power, and the second lens, the third lens, the fourth lens, and the sixth lens may have positive optical power.

[0070] In an exemplary embodiment, the object side surface of the first lens may be a concave surface, and the image side surface may be a convex surface. The object side surface of the second lens may be a convex surface, and the image side surface may be a concave surface. The object side surface of the third lens may be a concave surface or a convex surface, and the image side surface may be a convex surface. Both the object side surface and the image side surface of the fourth lens may be convex surfaces. The object side surface of the fifth lens may be a convex surface, and the image side surface may be a concave surface. The object side surface of the sixth lens may be a concave surface, and the image side surface may be a convex surface. The object side surface of the seventh lens may be a convex surface, and the image side surface may be a concave surface.

[0071] In example embodiments, the optical lens may further include a spacer group, and the spacer group may include a sixth spacer located between the sixth lens and the seventh lens and at least partially in contact with the image-side surface of the sixth lens.

[0072] In an exemplary embodiment, the spacer group may also include one or more of a first spacer, a second spacer, a third spacer, a fourth spacer, and a fifth spacer. The first spacer may be located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens. The second spacer may be located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens. The third spacer may be located between the third lens and the fourth lens and directly in contact with the image side surface of the third lens. The fourth spacer may be located between the fourth lens and the fifth lens and directly in contact with the image side surface of the fourth lens. The fifth spacer may be located between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens. Exemplarily, the spacer 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, it is beneficial to block stray light, reduce interference with image quality, improve the imaging quality of the optical lens, and improve the assembly stability of the optical lens.

[0073] In an exemplary embodiment, the optical lens may further include a lens barrel having an accommodation space, and the seven-piece lens group and the spacer group may be accommodated in the lens barrel.

[0074] In an exemplary embodiment, the effective focal length f7 of the seventh lens, the inner diameter d6m of the image side surface of the sixth spacer, and the inner diameter d6s of the object side surface of the sixth spacer satisfy: -2.0<f7 / (d6m-d6s)<-1.5. By satisfying this conditional expression, the effective focal length of the seventh lens is controlled within a reasonable range, and the smoothness and formability of the effective surface of the seventh lens (the aspheric surface for transmitting effective light) can be improved; in addition, by controlling the inner diameters of the object side and the image side of the sixth spacer, the cross-shaped stray light and the dragging stray light reflected by the inner diameter surface of the spacer can be reduced, thereby improving the imaging quality.

[0075] In some embodiments, the optical lens according to the present application may further include a filter and / or protective glass disposed between the seventh lens and the imaging surface, for filtering light with different wavelengths, correcting color deviation, and protecting the photosensitive element located on the imaging surface.

[0076] In some embodiments, the optical lens according to the present application may further include an aperture disposed between the third lens and the fourth 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.

[0077] According to the optical lens of the above embodiment of the present application, it can use multiple lenses, such as the seven-lens group 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.

[0078] In an embodiment of the present application, at least one of the mirror surfaces of each lens in the first lens to the seventh 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 that occurs 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 seventh lens are aspherical mirror surfaces.

[0079] 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.

[0080] Example 1

[0081] The following reference Figure 2 An optical lens according to Example 1 of the present application is described. Figure 2 A schematic structural diagram of the optical lens of Example 1 is shown.

[0082] like Figure 2 As shown, the optical lens comprises a lens barrel P0 and a seven-piece lens group and a spacer group placed in the lens barrel P0. The seven-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7.

[0083] The aperture stop STO may be disposed between the third lens E3 and the fourth lens E4.

[0084] The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5 and a sixth spacer P6. The spacers can block the excess light in the imaging process from entering the next lens, and at the same time make the lens and the lens barrel better supported, thereby enhancing the structural stability of the optical lens.

[0085] The first lens E1 has negative focal power, and its object side surface S1 is concave, and its image side surface S2 is convex. 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 concave, and its image side surface S6 is convex. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter has an object side surface S15 (not shown) and an image side surface S16 (not shown). Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0086] Table 1 shows the basic parameters of the optical lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0087]

[0088] Table 1

[0089] In Example 1, the object-side surface and the image-side surface of the first lens E1 to the seventh lens E7 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0090]

[0091] Among them, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, 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 aspherical surface.

[0092] 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 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0093]

[0094]

[0095] Table 2-1

[0096]

[0097] Table 2-2

[0098] 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 distortion curve of the optical lens of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4D 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. 4A to 4D It can be seen that the optical lens provided in Example 1 can achieve good imaging quality.

[0099] Example 2

[0100] The following reference Figure 3 Describe the optical lens according to Example 2 of the present application. Figure 3 FIG. 2 is a schematic diagram showing the structure of an optical lens of Embodiment 2. In this embodiment, for the sake of brevity, some descriptions similar to those of Embodiment 1 will be omitted.

[0101] like Figure 3 As shown, the optical lens comprises a lens barrel P0 and a seven-piece lens group and a spacer group placed in the lens barrel P0. The seven-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7.

[0102] The parameters such as the radius of curvature, center thickness, etc. of each lens of the optical lens of this embodiment and embodiment 1, as well as the spacing distance between lenses and high-order coefficients are the same, as shown in Table 1, Table 2-1 and Table 2-2. In addition, the number of lens barrels and spacers 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 spacer are different, for example, at least one of the parameters such as the lens barrel size, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the spacing distance between the spacers 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: 4A to 4D shown.

[0103] Example 3

[0104] The following reference Figure 5 Describe the optical lens according to Example 3 of the present application. Figure 5 A schematic structural diagram of the optical lens of Example 3 is shown.

[0105] like Figure 5 As shown, the optical lens comprises a lens barrel P0 and a seven-piece lens group and a spacer group placed in the lens barrel P0. The seven-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7.

[0106] The aperture stop STO may be disposed between the third lens E3 and the fourth lens E4.

[0107] The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5 and a sixth spacer P6. The spacers can block excess light from entering the next lens during the imaging process, while allowing the lens to better support the lens barrel, thereby enhancing the structural stability of the optical lens.

[0108] The first lens E1 has negative focal power, and its object side surface S1 is concave, and its image side surface S2 is convex. 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 convex. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter has an object side surface S15 (not shown) and an image side surface S16 (not shown). Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0109] Table 3 shows the basic parameter table of the optical lens of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0110]

[0111]

[0112] Table 3

[0113] In this embodiment, the object-side surface and the image-side surface of the first lens E1 to the seventh lens E7 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the formula (1) given in the aforementioned embodiment 1.

[0114] Tables 4-1 and 4-2 below 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, 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0115]

[0116] Table 4-1

[0117]

[0118]

[0119] Table 4-2

[0120] 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 distortion curve of the optical lens of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.7D 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. FIG. 7A to FIG. 7D It can be seen that the optical lens provided in Example 3 can achieve good imaging quality.

[0121] Example 4

[0122] The following reference Figure 6 Describe the optical lens according to Example 4 of the present application. Figure 6 FIG. 4 is a schematic diagram showing the structure of an optical lens according to Embodiment 4. In this embodiment, for the sake of brevity, some descriptions similar to those in Embodiment 3 are omitted.

[0123] like Figure 6 As shown, the optical lens comprises a lens barrel P0 and a seven-piece lens group and a spacer group placed in the lens barrel P0. The seven-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7.

[0124] The parameters such as the radius of curvature, center thickness, etc. of each lens of the optical lens of this embodiment and embodiment 3, as well as the spacing distance between lenses and high-order coefficients are the same, as shown in Table 3, Table 4-1 and Table 5-2. In addition, the number of lens barrels and spacers included in the optical lens 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 spacer are different, for example, at least one of the parameters such as the lens barrel size, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the spacing distance between the spacers 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: FIG. 7A to FIG. 7D shown.

[0125] Example 5

[0126] The following reference Figure 8 Describe the optical lens according to Example 5 of the present application. Figure 8 A schematic structural diagram of the optical lens of Example 5 is shown.

[0127] like Figure 8 As shown, the optical lens comprises a lens barrel P0 and a seven-piece lens group and a spacer group placed in the lens barrel P0. The seven-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7.

[0128] The aperture stop STO may be disposed between the third lens E3 and the fourth lens E4.

[0129] The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5 and a sixth spacer P6. The spacers can block excess light from entering the next lens during the imaging process, while allowing the lens to better support the lens barrel, thereby enhancing the structural stability of the optical lens.

[0130] The first lens E1 has negative focal power, and its object side surface S1 is concave, and its image side surface S2 is convex. 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 convex. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter has an object side surface S15 (not shown) and an image side surface S16 (not shown). Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17 .

[0131] Table 5 shows the basic parameter table of the optical lens of Example 5, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0132]

[0133] Table 5

[0134] In this embodiment, the object-side surface and the image-side surface of the first lens E1 to the seventh lens E7 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the formula (1) given in the aforementioned embodiment 1.

[0135] Tables 6-1 and 6-2 below 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, 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0136]

[0137]

[0138] Table 6-1

[0139] Face number A18 A20 A22 A24 A26 A28 A30 S1 -2.6219E-03 1.1883E-03 -6.6386E-04 2.8847E-04 -1.5465E-04 6.6053E-05 -2.5945E-05 S2 -3.6626E-05 3.2344E-04 1.8172E-04 3.6732E-05 1.2152E-05 -2.5924E-05 -1.9028E-06 S3 -2.8618E-04 -5.5298E-05 4.5447E-05 2.4329E-05 -3.3667E-06 -9.6158E-06 5.7149E-06 S4 3.3231E-05 4.7017E-06 -3.8535E-06 1.0092E-05 -5.0165E-06 0.0000E+00 0.0000E+00 S5 3.5097E-06 -6.3190E-06 -2.3223E-06 1.3880E-06 0.0000E+00 0.0000E+00 0.0000E+00 S6 -3.6816E-06 -2.9079E-06 -2.7034E-07 -1.6253E-07 0.0000E+00 0.0000E+00 0.0000E+00 S7 1.7708E-05 -4.5627E-07 8.9933E-07 -4.7717E-06 1.3588E-06 0.0000E+00 0.0000E+00 S8 9.5616E-05 6.2228E-05 7.6267E-06 1.9694E-06 -7.2031E-06 0.0000E+00 0.0000E+00 S9 9.9267E-05 4.4208E-05 2.5515E-06 -3.7902E-06 0.0000E+00 0.0000E+00 0.0000E+00 S10 -1.0537E-05 -4.5662E-05 -1.1220E-05 1.3098E-05 2.3531E-06 0.0000E+00 0.0000E+00 S11 -3.1426E-04 3.3638E-04 9.8616E-05 2.5614E-05 -3.4243E-05 0.0000E+00 0.0000E+00 S12 -7.2175E-04 -7.2619E-04 -4.5416E-05 3.8926E-04 2.2564E-04 -4.3561E-06 -8.1529E-05 S13 -2.9065E-04 -3.4424E-04 3.7954E-04 2.5251E-04 -3.1936E-04 8.0188E-05 0.0000E+00 S14 9.5128E-03 -5.8413E-03 1.4059E-03 -1.4668E-03 6.9307E-04 -3.1632E-05 3.0193E-04

[0140] Table 6-2

[0141] Fig. 10AThe 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 distortion curve of the optical lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig. 10D 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. 10D It can be seen that the optical lens provided in Example 5 can achieve good imaging quality.

[0142] Example 6

[0143] The following reference Fig. 9 Describe the optical lens according to Example 6 of the present application. Fig. 9 FIG. 6 is a schematic diagram showing the structure of an optical lens according to Embodiment 6. In this embodiment, for the sake of brevity, some descriptions similar to those in Embodiment 5 are omitted.

[0144] like Fig. 9 As shown, the optical lens comprises a lens barrel P0 and a seven-piece lens group and a spacer group placed in the lens barrel P0. The seven-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7.

[0145] The parameters such as the radius of curvature, center thickness, etc. of each lens of the optical lens of this embodiment and embodiment 5, as well as the spacing distance between lenses and high-order coefficients are the same, as shown in Table 5, Table 6-1 and Table 6-2. In addition, the number of lens barrels and spacers included in the optical lens 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 spacer are different, for example, at least one of the parameters such as the lens barrel size, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the spacing distance between the spacers 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. 10D shown.

[0146] Table 7 below shows some parameters of the optical lenses of Examples 1 to 6, including the effective focal length of each lens, the combined focal length of the lenses, half of the maximum field of view of the optical lens Semi-FOV, the maximum effective radius of some lenses, etc. Among them, the units of each focal length value, maximum effective radius and spacing distance are all millimeters (mm).

[0147] Parameter value / example 1 2 3 4 5 6 f(mm) 2.12 2.12 2.12 2.12 2.12 2.12 f1(mm) -4.54 -4.54 -4.56 -4.56 -4.54 -4.54 f2(mm) 14.23 14.23 14.99 14.99 16.22 16.22 f3(mm) 9.86 9.86 13.04 13.04 9.09 9.09 f4(mm) 2.40 2.40 2.26 2.26 2.39 2.39 f5(mm) -5.31 -5.31 -5.27 -5.27 -5.22 -5.22 f6(mm) 2.55 2.55 2.61 2.61 2.56 2.56 f7(mm) -3.41 -3.41 -3.46 -3.46 -3.46 -3.46 Semi-FOV(°) 61.9 61.9 61.6 61.6 62.1 62.1 DT11(mm) 2.29 2.29 2.27 2.27 2.29 2.29 DT12(mm) 1.55 1.55 1.51 1.51 1.54 1.54 DT32(mm) 0.78 0.78 0.74 0.74 0.77 0.77 DT42(mm) 1.01 1.01 0.99 0.99 0.99 0.99 f23(mm) 6.17 6.17 7.29 7.29 6.16 6.16 SAG12(mm) 0.62 0.62 0.63 0.63 0.62 0.62 SAG21(mm) 0.46 0.46 0.47 0.47 0.47 0.47

[0148] Table 7

[0149] Table 8 below shows some basic parameters of the lens barrel and spacers of the optical lenses of Examples 1 to 6, such as the maximum thickness of the spacers, the interval between the spacers, etc. The units of the basic parameters listed in the table are all millimeters (mm).

[0150]

[0151]

[0152] Table 8

[0153] In summary, in Examples 1 to 6, the optical lenses respectively meet the conditions in Table 9 below.

[0154] Conditional / Example 1 2 3 4 5 6 D1s / R2+D1s / f1 -1.92 -2.28 -2.00 -2.32 -2.02 -2.29 EP01 / (SAG12+SAG21) 1.08 1.24 1.17 1.02 1.14 1.18 (D1s-d1s) / (DT11-DT12) 3.45 4.86 3.77 5.04 3.65 4.99 f2*N2 / EP12 69.54 70.82 68.59 68.98 79.60 75.91 CT2 / CP1+T23 / CP1 43.46 37.53 33.84 31.23 27.68 29.66 f23 / (D2s-d2s) 2.45 1.37 2.40 1.52 2.24 1.31 R7 / d3s+f3 / D3s 9.97 9.21 7.99 7.00 8.49 8.73 (CT4+T45) / EP34 1.35 1.61 1.36 1.37 1.26 1.53 f4*N4 / D4s 0.77 0.57 0.72 0.53 0.76 0.57 (d4s / d3m) / (DT42 / DT32) 1.25 1.19 1.14 1.14 1.13 1.16 (D5s-D4m) / T56 5.34 0.22 4.31 0.11 5.55 0.22 CT6 / T67+CT6 / CP6 9.71 9.89 10.14 10.09 10.90 10.83 f7 / (d6m-d6s) -1.92 -1.66 -1.95 -1.95 -1.95 -1.95 (R9*d5s) / (R11*d6s) -1.48 -1.41 -1.42 -1.46 -1.46 -1.46 TAN(Semi-FOV)*f / d0s 0.54 0.49 0.52 0.55 0.53 0.51

[0155] Table 9

[0156] Table 10 below shows a comparative analysis of stray light effects of optical lens samples 1, 2, and 3. Fig.11A and Fig. 11B ,as well as Fig. 12A and Fig. 12B As shown, through experimental comparison of optical lenses, it can be found that if the numerical range of the conditional formula -2.5<D1s / R2+D1s / f1<-1.8 is exceeded, the optical performance of the optical lens is unqualified, for example Fig.11A Sample 2 and Fig. 12A Sample 3 shown; and by optimizing the optical system structure and making the optical lens satisfy the conditional formula f1<0; R2<0; and the numerical range of -2.5<D1s / R2+D1s / f1<-1.8, for example Fig. 11B and Fig. 12B The sample 1 shown has a better effect of eliminating stray light than the samples 2 and 3 which are outside the numerical range of the conditional expression.

[0157]

[0158] Table 10

[0159] 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: include: A seven-piece lens group, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the object side to the image side along the optical axis; A spacer set, comprising a first spacer, wherein the first spacer is located between the first lens and the second lens and directly contacts the image side surface of the first lens; as well as a lens barrel in which the seven-piece lens group and the spacer group are accommodated; Among them, the outer diameter D1s of the object side surface of the first spacer, the effective focal length f1 of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: f1<0; R2<0; -2.5<D1s / R2+D1s / f1<-1.

8.

2. The optical lens according to claim 1, wherein: The object side surface of the first lens has an inflection point; the interval EP01 between the front end surface of the lens barrel and the first spacer along the optical axis, the on-axis distance SAG12 from the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens, and the on-axis distance SAG21 from the intersection of the object side surface of the second lens and the optical axis to the effective radius vertex of the object side surface of the second lens satisfy: 1.0<EP01 / (SAG12+SAG21)<1.

5.

3. The optical lens according to claim 1, wherein: An outer diameter D1s of the object side surface of the first spacer, an inner diameter d1s of the object side surface of the first spacer, a maximum effective radius DT11 of the object side surface of the first lens, and a maximum effective radius DT12 of the image side surface of the first lens satisfy: 3.4<(D1s-d1s) / (DT11-DT12)<5.

1.

4. The optical lens according to claim 1, wherein: The spacer set further includes a second spacer located between the second lens and the third lens and in direct contact with the image side surface of the second lens. The effective focal length f2 of the second lens, the refractive index N2 of the second lens, and the interval EP12 between the first spacer and the second spacer along the optical axis satisfy: 68.0<f2*N2 / EP12<80.

0.

5. The optical lens according to claim 1, wherein: The spacer set further includes a second spacer located between the second lens and the third lens and in direct contact with the image side surface of the second lens. The maximum thickness CP1 of the first spacer, the maximum thickness CP2 of the second spacer, the center thickness CT2 of the second lens on the optical axis, and the air interval T23 between the second lens and the third lens on the optical axis satisfy: 27.0<CT2 / CP1+T23 / CP2<43.

5.

6. The optical lens according to claim 1, wherein: The spacer set further includes a second spacer located between the second lens and the third lens and in direct contact with the image side surface of the second lens. The combined focal length f23 of the second lens and the third lens, the outer diameter D2s of the object-side surface of the second spacer, and the inner diameter d2s of the object-side surface of the second spacer satisfy: 1.0<f23 / (D2s-d2s)<2.

5.

7. The optical lens according to claim 1, wherein: The spacer group further includes a third spacer located between the third lens and the fourth lens and in direct contact with the image side surface of the third lens. An outer diameter D3s of the object side surface of the third spacer, an inner diameter d3s of the object side surface of the third spacer, an effective focal length f3 of the third lens, and a curvature radius R7 of the object side surface of the fourth lens satisfy: 7.0≤R7 / d3s+f3 / D3s≤10.

0.

8. The optical lens according to claim 1, wherein: The spacer group further includes a third spacer located between the third lens and the fourth lens and in direct contact with the image side surface of the third lens, and a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image side surface of the fourth lens. A center thickness CT4 of the fourth lens on the optical axis, an air interval T45 between the fourth lens and the fifth lens on the optical axis, and an interval EP34 between the third spacer and the fourth spacer along the optical axis satisfy: 1.0<(CT4+T45) / EP34<1.

8.

9. The optical lens according to claim 1, wherein: The spacer group further includes a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image side surface of the fourth lens. An effective focal length f4 of the fourth lens, a refractive index N4 of the fourth lens, and an outer diameter D4s of the object-side surface of the fourth spacer satisfy: 0.5<f4*N4 / D4s<1.

0.

10. The optical lens according to claim 1, wherein: The spacer group further includes a third spacer located between the third lens and the fourth lens and in direct contact with the image side surface of the third lens, and a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image side surface of the fourth lens. The inner diameter d4s of the object side surface of the fourth spacer, the inner diameter d3m of the image side surface of the third spacer, the maximum effective radius DT32 of the image side surface of the third lens, and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: 1.0<(d4s / d3m) / (DT42 / DT32)<1.

5.

11. The optical lens according to claim 1, wherein: The spacer group further includes a fourth spacer located between the fourth lens and the fifth lens and in direct contact with the image side surface of the fourth lens, and a fifth spacer located between the fifth lens and the sixth lens and in direct contact with the image side surface of the fifth lens. An outer diameter D5s of the object side surface of the fifth spacer, an outer diameter D4m of the image side surface of the fourth spacer, and an air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 0.1<(D5s-D4m) / T56<5.

6.

12. The optical lens according to claim 1, wherein: The spacer group further includes a sixth spacer located between the sixth lens and the seventh lens and in direct contact with the image side surface of the sixth lens. A center thickness CT6 of the sixth lens on the optical axis, an air interval T67 between the sixth lens and the seventh lens on the optical axis, and a maximum thickness CP6 of the sixth spacer satisfy: 9.5<CT6 / T67+CT6 / CP6<11.

0.

13. The optical lens according to claim 2, wherein: The spacer group further includes a sixth spacer located between the sixth lens and the seventh lens and in direct contact with the image side surface of the sixth lens. The effective focal length f7 of the seventh lens, the inner diameter d6m of the image-side surface of the sixth spacer, and the inner diameter d6s of the object-side surface of the sixth spacer satisfy: -2.0<f7 / (d6m-d6s)<-1.

5.

14. The optical lens according to claim 2, wherein: The spacer group further includes a fifth spacer located between the fifth lens and the sixth lens and in direct contact with the image side surface of the fifth lens, and a sixth spacer located between the sixth lens and the seventh lens and in direct contact with the image side surface of the sixth lens. The curvature radius R9 of the object side surface of the fifth lens, the curvature radius R11 of the object side surface of the sixth lens, the inner diameter d5s of the object side surface of the fifth spacer, and the inner diameter d6s of the object side surface of the sixth spacer satisfy: 1.3<(R9*d5s) / (R11*d6s)<1.

5.

15. The optical lens according to any one of claims 1 to 14, wherein: Half of the maximum field of view Semi-FOV of the optical lens, the total effective focal length f of the optical lens, and the inner diameter d0s of the front end surface of the lens barrel closest to the object side satisfy: 0.4<TAN(Semi-FOV)*f / d0s<0.

6.

16. The optical lens according to claim 1, wherein: The second lens has positive refractive power, its object side surface is convex, and its image side surface is concave; The third lens has positive refractive power, and its image side surface is convex; The fourth lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The fifth lens has negative optical power, its object side surface is convex, and its image side surface is concave; The sixth lens has positive refractive power, its object side surface is concave, and its image side surface is convex; and The seventh lens element has negative optical power, an object-side surface is convex, and an image-side surface is concave.

Images