Camera lens

Abstract

The invention discloses a pick-up lens, which comprises a lens barrel, a lens group and at least one spacing element, the lens group and the spacing element are assembled in the lens barrel, the number of lenses with focal power in the lens group is four, and the lens group comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from an object side to an image side along an optical axis; the first lens has negative focal power, and the image side surface is a concave surface; the second lens, the third lens and the fourth lens all have positive focal power, and the image side surface of the third lens and the object side surface of the fourth lens are convex surfaces; the at least one spacing element comprises a third spacing element which is arranged between the third lens and the fourth lens and is in direct contact with the image side surface of the third lens. Half semi-fov of the maximum field angle of the camera lens, the maximum height L of the lens barrel in the optical axis direction and the outer diameter D0s of the object side end face of the lens barrel satisfy 1.25 lt. Wherein, tan (semi-fov) * L / D0slt; 1.70, 1.70; the center thicknesses CT3 and CT4 of the third lens and the fourth lens on the optical axis satisfy 0.75 lt; cT3 / CT4lt; 1.10, 1.10; the effective focal length f3 of the third lens and the outer diameter D3s and the inner diameter d3s of the object side surface of the third spacing element satisfy 1.60 lt; f3 / D3slt; 2.90 and 0.45 lt, 2.90 and 0.45 lt; d3s / D3slt; and 0.85%.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more specifically, to a camera lens. Background Art

[0002] With the continuous enrichment of the types of technology products, the application scenarios of camera lenses have also been continuously broadened. When a camera lens is applied to a wearable device, in order to improve the user experience and meet the requirement of "invisible" wearing as much as possible, it is necessary for the camera lens to have as small a volume and mass as possible while ensuring performance requirements. In addition, for the currently commonly used four-lens-group lens, when the optical power of the third lens and the thickness of the third and fourth lenses meet the design requirements, stress problems often occur, reducing stability and affecting the lens quality. Summary of the Invention

[0003] The present application provides a camera lens, which may include a lens barrel and a lens group and at least one spacer element assembled in the lens barrel. The number of lenses with optical power in the lens group is four, including a first lens, a second lens, a third lens, and a fourth lens arranged in sequence from the object side to the image side along the optical axis; the first lens has a negative optical power, and its image side is concave; the second lens has a positive optical power; the third lens has a positive optical power, and its image side is convex; the fourth lens has a positive optical power, and its object side is convex; 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 camera lens can satisfy the conditions 1.25 < tan(semi-fov) × L / D0s < 1.70, 0.75 < CT3 / CT4 < 1.10, 1.60 < f3 / D3s < 2.90, and 0.45 < d3s / D3s < 0.85, where semi-fov is half of the maximum field of view angle of the camera lens, L is the maximum height of the lens barrel along the optical axis direction, D0s is the outer diameter of the object-side end face of the lens barrel, CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, f3 is the effective focal length of the third lens, D3s is the outer diameter of the object side of the third spacer element, and d3s is the inner diameter of the object side of the third spacer element.

[0004] In one embodiment, the inner diameter d3m of the image side of the third spacer element and the axial distance SAG41 from the intersection of the object side of the fourth lens and the optical axis to the vertex of the effective radius of the object side of the fourth lens may satisfy: 4.10 < d3m / SAG41 < 8.72.

[0005] In one embodiment, at least one spacer element further 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; the distance EP23 on the optical axis from the image side of the second spacer element to the object side of the third spacer element and the axial distance SAG32 from the intersection of the image side of the third lens and the optical axis to the vertex of the effective radius of the image side of the third lens satisfy: -1.90 < EP23 / SAG32 < -1.0; the effective focal length f3 of the third lens and the effective focal length f of the imaging lens satisfy: 6.60 < f3 / f < 9.25.

[0006] In one embodiment, at least one spacer element further 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; the effective focal length f3 of the third lens, the air gap T34 on the optical axis between the third lens and the fourth lens, and the distance EP23 on the optical axis from the image side of the second spacer element to the object side of the third spacer element satisfy: 9.40 < f3 / (T34 + EP23) < 13.30.

[0007] In one embodiment, at least one spacer element further includes a third auxiliary spacer element located between the third spacer element and the fourth lens and in direct contact with the image side of the third spacer element; the radius of curvature R6 of the image side of the third lens and the radius of curvature R7 of the object side of the fourth lens satisfy: -8.95 < R6 / R7 < -4.95; the maximum thickness CP3 of the third spacer element, the maximum thickness CP3b of the third auxiliary spacer element, and the air gap T34 on the optical axis between the third lens and the fourth lens satisfy: 4.50 < (CP3 + CP3b) / T34 < 9.10.

[0008] In one embodiment, at least one spacer element may further include 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 distance EP01 on the optical axis from the object-side end face of the lens barrel to the object side of the first spacer element, the central thickness CT1 of the first lens on the optical axis, and the radius of curvature R2 of the image side of the first lens satisfy: 0.15 < (EP01 - CT1) / R2 < 1.10.

[0009] In one embodiment, at least one spacer element may further include 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 outer diameter D1m of the image side of the first spacer element and the inner diameter d1m of the image side of the first spacer element satisfy: 2.0 < D1m / d1m < 2.8.

[0010] In one embodiment, at least one spacer element may further include 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; among the first spacer element, the second spacer element, and the third spacer element, the spacer element with the largest outer diameter is the first spacer element; the center thickness CT2 of the second lens on the optical axis and the outer diameter D1m of the image side of the first spacer element may satisfy: 0.02 < CT2 / D1m < 0.10.

[0011] In one embodiment, at least one spacer element may further include 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 and the outer diameter D2s of the object side of the second spacer element may satisfy: 1.35 < f2 / D2s < 5.40.

[0012] In one embodiment, the effective focal length f2 of the second lens and the radius of curvature R4 of the image side of the second lens may satisfy: 。

[0013] In one embodiment, at least one spacer element may further include 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 absolute value of the effective focal length of the second lens is greater than the sum of the absolute values of the effective focal lengths of the first lens and the fourth lens; the absolute value of the effective focal length of the third lens is greater than the sum of the absolute values of the effective focal lengths of the first lens and the fourth lens; the radius of curvature R6 of the image side of the third lens and the inner diameter d2m of the image side of the second spacer element may satisfy: -6.25 < R6 / d2m < -3.50; the effective focal length f2 of the second lens and the inner diameter d1m of the image side of the first spacer element may satisfy: 2.28 < f2 / d1m < 10.97.

[0014] The camera lens according to an embodiment of the present application includes a lens barrel and first to fourth lenses assembled therein and arranged in sequence from the object side to the image side along the optical axis. The first lens has a negative optical power and its image side is concave, the second lens has a positive optical power, the third lens has a positive optical power and its image side is convex, and the fourth lens has a positive optical power and its object side is convex; there is a third spacer element directly contacting the image side of the third lens between the third lens and the fourth lens; the number of lenses with optical power in the camera lens is four; half of the maximum field of view angle semi-fov, the maximum height L of the lens barrel along the optical axis, and the outer diameter D0s of the object-side end face of the lens barrel of the camera lens satisfy the conditional formula 1.25 < tan(semi-fov) × L / D0s < 1.70, the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy the conditional formula 0.75 < CT3 / CT4 < 1.10, the effective focal length f3 of the third lens and the outer diameter D3s of the object side of the third spacer element satisfy the conditional formula 1.60 < f3 / D3s < 2.90, and the inner diameter d3s of the object side of the third spacer element and the outer diameter D3s satisfy the conditional formula 0.45 < d3s / D3s < 0.85. The camera lens according to an embodiment of the present application is a wide-angle small-sized lens, the medium thicknesses of the third lens and the fourth lens are evenly matched, and at the same time, the stray light between the third lens and the fourth lens can be effectively blocked and absorbed by the object side of the third spacer element. However, the contact between the third lens and the third spacer element is unstable in the non-effective diameter region. By further restricting the conditional formula 0.45 < d3s / D3s < 0.85, the ratio of the inner diameter to the outer diameter of the object side of the third spacer element is controlled within a reasonable range, and the width of the object side of the third spacer element is restricted, so that the stress of the contact element between the third lens and the fourth lens is significantly reduced and more evenly distributed, effectively improving the performance stability after the lens is assembled. Brief Description of the Drawings

[0015] In conjunction with the drawings, through the following detailed description of non-limiting embodiments, other features, objects, and advantages of the present application will become more apparent. In the drawings: Figure 1 The structure and related parameter schematic diagram of the camera lens according to an exemplary embodiment of the present application are shown; Figure 2 The structural schematic diagram of the camera lens according to Embodiment 1 of the present application is shown; Figure 3 The structural schematic diagram of the camera lens according to Embodiment 2 of the present application is shown; Figure 4 The structural schematic diagram of the camera lens according to Embodiment 3 of the present application is shown; Figures 5 to 8Respectively shown are the axial chromatic aberration curve, astigmatism curve, lateral chromatic aberration curve, and relative illumination curve of the camera lens according to Embodiment 1, Embodiment 2, and Embodiment 3 of the present application; Figure 9 Shown is a schematic structural diagram of the camera lens according to Embodiment 4 of the present application; Figure 10 Shown is a schematic structural diagram of the camera lens according to Embodiment 5 of the present application; Figure 11 Shown is a schematic structural diagram of the camera lens according to Embodiment 6 of the present application; Figures 12 to 15 Respectively shown are the axial chromatic aberration curve, astigmatism curve, lateral chromatic aberration curve, and relative illumination curve of the camera lens according to Embodiment 4, Embodiment 5, and Embodiment 6 of the present application; Figure 16 Shown is a schematic structural diagram of the camera lens according to Embodiment 7 of the present application; Figure 17 Shown is a schematic structural diagram of the camera lens according to Embodiment 8 of the present application; Figure 18 Shown is a schematic structural diagram of the camera lens according to Embodiment 9 of the present application; Figures 19 to 22 Respectively shown are the axial chromatic aberration curve, astigmatism curve, lateral chromatic aberration curve, and relative illumination curve of the camera lens according to Embodiment 7, Embodiment 8, and Embodiment 9 of the present application; Figure 23 Shown is a stress analysis diagram of the camera lens according to Embodiment 1 of the present application under the conditions of satisfying the conditional formula tan(semi - fov)×L / D0s = 1.65, CT3 / CT4 = 0.78, f3 / D3s = 2.54, and d3s / D3s = 0.31; Figure 24 Shown is a stress analysis diagram of the camera lens according to Embodiment 1 of the present application under the conditions of satisfying the conditional formula tan(semi - fov)×L / D0s = 1.65, CT3 / CT4 = 0.78, f3 / D3s = 2.54, and d3s / D3s = 0.92; Figure 25 Shown is a stress analysis diagram of the camera lens according to Embodiment 1 of the present application under the conditions of satisfying the conditional formula tan(semi - fov)×L / D0s = 1.65, CT3 / CT4 = 0.78, f3 / D3s = 2.54, and d3s / D3s = 0.48. Detailed implementation manners

[0016] 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.

[0017] 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.

[0018] 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.

[0019] In this article, the paraxial area refers to the area 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 area; 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 area. The judgment of the surface type in the paraxial area can be judged according to the general method in this field, for example, the positive and negative R value (R refers to the radius of curvature of the paraxial area) is used to judge the concave and convex. In this article, the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0020] The solutions described in the embodiments of the present application can be simulated by software / tools such as ZEMAX and CODE V. The solutions described in some embodiments can be simulated by CODE V. In the process of simulation using the above software / tools, the surface shape of the lens can be appropriately adjusted according to the surface shape model provided by the software / tool used.

[0021] It should also be understood that the terms "comprise", "comprising", "have", "including" and / or "containing", when used in this specification, denote the presence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than an individual element in the list. In addition, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.

[0022] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formalized sense unless expressly so defined herein.

[0023] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but should not be construed as a limitation on the patent 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 modifications and improvements can be made, and these all belong to the protection scope of the present application. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0024] The features, principles and other aspects of the present application will be described in detail below.

[0025] A camera lens according to an exemplary embodiment of the present application may include a lens group and at least one spacer element. The lens group may be, for example, a four-piece lens group, including a first lens, a second lens, a third lens and a fourth lens. In an exemplary embodiment, the first lens to the fourth lens may be arranged in order from the object side to the image side along the optical axis.

[0026] In an exemplary embodiment, the first lens may have a negative optical power, and its image side may be concave. The second lens may have a positive optical power. The third lens may have a positive optical power, and its image side may be convex. The fourth lens may have a positive optical power, and its object side may be convex.

[0027] In an exemplary embodiment, the camera lens may further include a lens barrel, and the lens group and at least one spacer element may be assembled in the lens barrel.

[0028] In an exemplary embodiment, the number of lenses with optical power in the camera lens may be four.

[0029] In an exemplary embodiment, at least one spacer element in the camera lens may include a third spacer element located between the third lens and the fourth lens and in direct contact with the image side surface of the third lens.

[0030] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula 1.25 < tan(semi-fov) × L / D0s < 1.70, where semi-fov is half of the maximum field of view angle of the camera lens; L is the maximum height of the lens barrel along the optical axis, and the maximum height of the lens barrel along the optical axis may refer to the maximum dimension or height of the lens barrel in the direction along the optical axis or parallel to the optical axis; D0s is the outer diameter of the object-side end face of the lens barrel, and the object-side end face of the lens barrel may refer to the end face or surface of the lens barrel closest to the object side and perpendicular or nearly perpendicular to the optical axis.

[0031] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula 0.75 < CT3 / CT4 < 1.10, where CT3 is the central thickness of the third lens on the optical axis and CT4 is the central thickness of the fourth lens on the optical axis.

[0032] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula 1.60 < f3 / D3s < 2.90, where f3 is the effective focal length of the third lens and D3s is the outer diameter of the object-side surface of the third spacer element.

[0033] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula 0.45 < d3s / D3s < 0.85, where d3s is the inner diameter of the object-side surface of the third spacer element and D3s is the outer diameter of the object-side surface of the third spacer element.

[0034] The camera lens according to an embodiment of the present application includes a lens barrel and first to fourth lenses assembled therein and arranged in sequence from the object side to the image side along the optical axis. The first lens has a negative optical power and a concave image side surface, the second lens has a positive optical power, the third lens has a positive optical power and a convex image side surface, and the fourth lens has a positive optical power and a convex object side surface. There is a third spacer element in direct contact with the image side surface of the third lens between the third lens and the fourth lens. The number of lenses with optical power in the camera lens is four. The half of the maximum field of view angle semi-fov, the maximum height L of the lens barrel along the optical axis, and the outer diameter D0s of the object side end surface of the lens barrel of the camera lens satisfy the conditional formula 1.25 < tan(semi-fov) × L / D0s < 1.70. The central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy the conditional formula 0.75 < CT3 / CT4 < 1.10. The effective focal length f3 of the third lens and the outer diameter D3s of the object side surface of the third spacer element satisfy the conditional formula 1.60 < f3 / D3s < 2.90. Moreover, the inner diameter d3s of the object side surface of the third spacer element and the outer diameter D3s satisfy the conditional formula 0.45 < d3s / D3s < 0.85. The camera lens according to an embodiment of the present application is a wide-angle and small-sized lens. The medium thickness combination of the third lens and the fourth lens is uniform. At the same time, the stray light between the third lens and the fourth lens can be effectively blocked and absorbed by the object side surface of the third spacer element. However, the bearing of the third lens in the non-effective diameter area and the bearing position of the third spacer element will be unstable. By further restricting the conditional formula 0.45 < d3s / D3s < 0.85, the ratio of the inner diameter to the outer diameter of the object side surface of the third spacer element is controlled within a reasonable range, restricting the width of the object side surface of the third spacer element, so that the stress of the bearing element between the third lens and the fourth lens is significantly reduced and more evenly distributed, effectively improving the performance stability after the lens is assembled.

[0035] See the appendix Figures 23 to 25 , wherein, Figure 23 Fig. shows the stress analysis diagram of the camera lens according to an exemplary embodiment (such as Embodiment 1) of the present application when the conditional formulas tan(semi-fov) × L / D0s = 1.65, CT3 / CT4 = 0.78, f3 / D3s = 2.54, and d3s / D3s = 0.31 are satisfied. It can be seen that when the lens satisfying the above conditions is assembled, there is a large assembly pressure on the third lens, and there is a large risk of deformation, affecting the optical performance of the lens; Figure 24The figure shows the stress analysis diagram of the camera lens under the conditions that satisfy the conditional expressions tan(semi - fov)×L / D0s = 1.65, CT3 / CT4 = 0.78, f3 / D3s = 2.54, and d3s / D3s = 0.92. It can be seen that when assembling the lens that meets the above conditions, the stress of the bearing elements (such as the third spacer element and the third auxiliary spacer element) between the third lens and the fourth lens is relatively large, and there is a greater risk of deformation (and the deformation of the third auxiliary spacer element is likely to newly generate stray light); Figure 25 The figure shows the stress analysis diagram of the camera lens under the conditions that satisfy the conditional expressions tan(semi - fov)×L / D0s = 1.65, CT3 / CT4 = 0.78, f3 / D3s = 2.54, and d3s / D3s = 0.48. Compared with Figure 23 and Figure 24 the two stress conditions of the lens shown in Figure 25 after improving the structure of the third spacer element and its bearing position, the stress condition of the lens shown in

[0036] has been significantly improved. Among them, the stress of the bearing elements (such as the third spacer element and the third auxiliary spacer element) between the third lens and the fourth lens is significantly reduced. At the same time, the stress of the third lens also decreases, greatly reducing the performance impact after the lens is assembled. Therefore, according to the embodiment of the present application, the camera lens controls the half of the maximum field of view semi - fov of the camera lens, the maximum height L of the lens barrel along the optical axis, and the outer diameter D0s of the object - side end face of the lens barrel to satisfy the conditional expression 1.25 < tan(semi - fov)×L / D0s < 1.70, the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy the conditional expression 0.75 < CT3 / CT4 < 1.10, the effective focal length f3 of the third lens and the outer diameter D3s of the object - side surface of the third spacer element satisfy the conditional expression 1.60 < f3 / D3s < 2.90, and at the same time controls the inner diameter d3s of the object - side surface of the third spacer element and the outer diameter D3s of the object - side surface of the third spacer element to satisfy the conditional expression 0.45 < d3s / D3s < 0.85. It can have the characteristics of wide - angle miniaturization, uniform thickness matching between the third and fourth lenses, and the stray light between the third and fourth lenses can be effectively blocked and absorbed by the object - side surface of the third spacer element. At the same time, the width of the object - side surface of the third spacer element is reasonably restricted, so that the stress of the bearing elements between the third lens and the fourth lens is significantly reduced and more evenly distributed, effectively improving the performance stability after the lens is assembled.

[0037] In an exemplary embodiment, at least one spacer element in the imaging lens may further include a second spacer element located between the second lens and the third lens and in direct contact with the image side surface of the second lens.

[0038] In an exemplary embodiment, at least one spacer element in the imaging lens may further include a third auxiliary spacer element located between the third spacer element and the fourth lens and in direct contact with the image side surface of the third spacer element.

[0039] In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional formula 4.10 < d3m / SAG41 < 8.72, where d3m is the inner diameter of the image side surface of the third spacer element, and SAG41 is the axial distance from the intersection of the object side surface of the fourth lens and the optical axis to the vertex of the effective radius of the object side surface of the fourth lens. By constraining the inner diameter of the image side surface of the third spacer element and the sag of the object side surface of the fourth lens to satisfy 4.10 < d3m / SAG41 < 8.72, the light path between the third lens and the fourth lens, especially near the effective diameter position, is constrained, reducing the risk of stray light at the edge of the effective diameter of the lens while ensuring the lens processing performance of the fourth lens.

[0040] In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional formulas -1.90 < EP23 / SAG32 < -1.0 and 6.60 < f3 / f < 9.25, where EP23 is the axial distance on the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element, SAG32 is the axial distance from the intersection of the image side surface of the third lens and the optical axis to the vertex of the effective radius of the image side surface of the third lens, f3 is the effective focal length of the third lens, and f is the effective focal length of the imaging lens. By controlling the imaging lens to satisfy the conditional formulas -1.90 < EP23 / SAG32 < -1.0 and 6.60 < f3 / f < 9.25, the edge thickness of the third lens can be reasonably constrained, which is beneficial to ensuring the processing performance of the third lens. At the same time, the light path between the third lens and the fourth lens can be reasonably constrained, which is beneficial to reducing the stray light between the lenses and improving the imaging quality.

[0041] In an exemplary embodiment, the camera lens of the present application can satisfy the conditional expression 9.40 < f3 / (T34 + EP23) < 13.30, where f3 is the effective focal length of the third lens; T34 is the air gap between the third lens and the fourth lens on the optical axis, that is, the distance on the optical axis from the image side of the third lens to the object side of the fourth lens; EP23 is the distance on the optical axis from the image side of the second spacer element to the object side of the third spacer element. By controlling the camera lens to satisfy the conditional expression 9.40 < f3 / (T34 + EP23) < 13.30 and reasonably controlling the effective focal length of the third lens, it is beneficial to restrict the traveling direction of light rays in the third lens; by reasonably controlling the air gap between the third and fourth lenses and the distance between the second spacer element and the third spacer element, the center thickness and edge thickness of the third lens can be indirectly restricted, which is beneficial to ensuring that the lens has a suitable thickness ratio for molding.

[0042] In an exemplary embodiment, the camera lens of the present application can satisfy the conditional expressions -8.95 < R6 / R7 < -4.95 and 4.50 < (CP3 + CP3b) / T34 < 9.10, where R6 is the radius of curvature of the image side of the third lens; R7 is the radius of curvature of the object side of the fourth lens; CP3 is the maximum thickness of the third spacer element, CP3b is the maximum thickness of the third auxiliary spacer element, and the maximum thickness of the spacer element can refer to the maximum dimension or thickness of the spacer element in the direction along or parallel to the optical axis; T34 is the air gap between the third lens and the fourth lens on the optical axis, that is, the distance on the optical axis from the image side of the third lens to the object side of the fourth lens. By controlling the camera lens to satisfy the conditional expressions -8.95 < R6 / R7 < -4.95 and 4.50 < (CP3 + CP3b) / T34 < 9.10 and reasonably controlling the radius of curvature of the image side of the third lens and the radius of curvature of the object side of the fourth lens, the surface shapes of the third lens and the fourth lens can be effectively controlled, which is further beneficial to the traveling direction of light rays in the lens and ensures the final imaging quality; by reasonably controlling the maximum thicknesses of the third spacer element, the third auxiliary spacer element, and the air gap between the third and fourth lenses, the edge thickness to center thickness ratio of the lens can be indirectly ensured, which is beneficial to the molding of the third spacer element, the third auxiliary spacer element, and the third lens.

[0043] In an exemplary embodiment, the camera lens of the present application can satisfy the conditional expression 0.15 < (EP01 - CT1) / R2 < 1.10, where EP01 is the distance on the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element. The object-side end face of the lens barrel can refer to the end face or surface of the lens barrel closest to the object side that is perpendicular or nearly perpendicular to the optical axis; CT1 is the central thickness of the first lens on the optical axis; and R2 is the radius of curvature of the image-side surface of the first lens. By controlling the camera lens to satisfy the conditional expression 0.15 < (EP01 - CT1) / R2 < 1.10, reasonably controlling the central thickness of the first lens on the optical axis and the radius of curvature of the image-side surface of the first lens, it is possible to ensure that the first lens has a suitable sagittal height-to-thickness ratio, which is beneficial to the processing and forming of the first lens; reasonably controlling the distance between the front end (object side end) of the lens barrel and the first spacer element can, on the one hand, ensure that the most convex part of the object-side surface of the first lens does not exceed the front end face of the lens barrel, and on the other hand, ensure a suitable space for dispensing and fixing.

[0044] In an exemplary embodiment, the camera lens of the present application can satisfy the conditional expression 2.0 < D1m / d1m < 2.8, where D1m is the outer diameter of the image-side surface of the first spacer element, and d1m is the inner diameter of the image-side surface of the first spacer element. By controlling the camera lens to satisfy the conditional expression 2.0 < D1m / d1m < 2.8, reasonably controlling the ratio of the outer diameter to the inner diameter of the image-side surface of the first spacer element can indirectly restrict the outer diameter of the first lens and ensure that the first lens has a sufficiently long bearing position to meet the assembly stability of the lens.

[0045] In an exemplary embodiment, at least one spacer element includes a first spacer element located between the first lens and the second lens and in direct contact with the image-side surface 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 surface of the second lens, and a third spacer element located between the third lens and the fourth lens and in direct contact with the image-side surface of the third lens; and among the first spacer element, the second spacer element, and the third spacer element, the spacer element with the largest outer diameter is the first spacer element; the central thickness CT2 of the second lens on the optical axis and the outer diameter D1m of the image-side surface of the first spacer element satisfy: 0.02 < CT2 / D1m < 0.10. By controlling the camera lens to satisfy this conditional expression, the central thickness and outer diameter of the second lens can be reasonably restricted, and the processability of the lens can be ensured.

[0046] In an exemplary embodiment, at least one spacer element further includes a second spacer element located between the second lens and the third lens and in direct contact with the image side surface of the second lens, and the imaging lens of the present application can satisfy the conditional formula 1.35 < f2 / D2s < 5.40, where f2 is the effective focal length of the second lens, and D2s is the outer diameter of the object side surface of the second spacer element. By controlling the imaging lens to satisfy the conditional formula 1.35 < f2 / D2s < 5.40 and reasonably restricting the ratio of the effective focal length of the second lens to the outer diameter of the object side surface of the second spacer element within this range, it helps to control the path of light in the second lens, and while ensuring the support of the second spacer element for the second lens, it can restrict the outer diameter of the second lens to ensure the processability of the second lens.

[0047] In an exemplary embodiment, the imaging lens of the present application can satisfy the conditional formula , where f2 is the effective focal length of the second lens, and R4 is the radius of curvature of the image side surface of the second lens. By controlling the imaging lens to satisfy the conditional formula , reasonably restricting the effective focal length of the second lens and the radius of curvature near the optical axis of the image side surface of the second lens helps to control the path of light in the second lens and is also beneficial to ensuring the processability of the second lens.

[0048] In an exemplary embodiment, at least one spacer element further includes a first spacer element located between the first lens and the second lens and in direct contact with the image side surface 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 surface of the second lens; the absolute value of the effective focal length of the second lens is greater than the sum of the absolute values of the effective focal lengths of the first lens and the fourth lens; the absolute value of the effective focal length of the third lens is greater than the sum of the absolute values of the effective focal lengths of the first lens and the fourth lens; and the imaging lens of the present application can satisfy the conditional formulas: -6.25 < R6 / d2m < -3.50 and 2.28 < f2 / d1m < 10.97, where R6 is the radius of curvature of the image side surface of the third lens, d2m is the inner diameter of the image side surface of the second spacer element, f2 is the effective focal length of the second lens, and d1m is the inner diameter of the image side surface of the first spacer element. By controlling the imaging lens to satisfy the conditional formulas -6.25 < R6 / d2m < -3.50 and 2.28 < f2 / d1m < 10.97, it is beneficial to control the inner diameter relationship between the second lens, the third lens and their spacer elements on the object side, beneficial to controlling the path of light when passing through the lens, and can reduce the overall sensitivity of the lens.

[0049] In an exemplary embodiment, the object side of the first lens may be convex or concave, and the image side may be concave. The object side of the second lens may be convex or concave, and the image side may be convex or concave. The object side of the third lens may be convex or concave, and the image side may be convex. The object side of the fourth lens may be convex, and the image side may be convex or concave.

[0050] In an exemplary embodiment, the imaging lens of the present application may include at least one aperture stop. The aperture stop may constrain the light path and control the light intensity. The aperture stop may be disposed at an appropriate position of the imaging lens. For example, the aperture stop may be disposed between the second lens and the third lens. It should be noted that the position of the above aperture stop is only an example rather than a limitation. In other exemplary embodiments, the aperture stop may also be disposed at other appropriate positions according to needs.

[0051] In an exemplary embodiment, one or more aspherical surfaces may be included in the object side and the image side of the first lens, the second lens, the third lens, and the fourth lens. The aspherical surface has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. By using an aspherical surface, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0052] In an exemplary embodiment, optionally, the above imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0053] On the one hand, the camera lens according to an embodiment of the present application includes a lens barrel and first to fourth lenses assembled therein and arranged in sequence from the object side to the image side along the optical axis. The first lens has a negative optical power and the image side is concave, the second lens has a positive optical power, the third lens has a positive optical power and the image side is convex, and the fourth lens has a positive optical power and its object side is convex; there is a third spacer element directly contacting the image side of the third lens between the third lens and the fourth lens; the number of lenses with optical power in the camera lens is four; half of the maximum field of view angle semi-fov, the maximum height L of the lens barrel along the optical axis, and the outer diameter D0s of the object-side end face of the lens barrel of the camera lens satisfy the conditional formula 1.25 < tan(semi-fov) × L / D0s < 1.70, the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy the conditional formula 0.75 < CT3 / CT4 < 1.10, the effective focal length f3 of the third lens and the outer diameter D3s of the object side of the third spacer element satisfy the conditional formula 1.60 < f3 / D3s < 2.90, and the inner diameter d3s of the object side of the third spacer element and the outer diameter D3s satisfy the conditional formula 0.45 < d3s / D3s < 0.85. The camera lens according to an embodiment of the present application is a wide-angle small-sized lens. The middle thickness matching of the third lens and the fourth lens is uniform. At the same time, the stray light between the third lens and the fourth lens can be effectively blocked and absorbed by the object side of the third spacer element. However, the abutment is unstable at the position where the third lens abuts against the third spacer element in the non-effective diameter region. By further restricting the conditional formula 0.45 < d3s / D3s < 0.85, the ratio of the inner diameter to the outer diameter of the object side of the third spacer element is controlled within a reasonable range, and the width of the object side of the third spacer element is restricted, so that the stress of the abutment element between the third lens and the fourth lens is significantly reduced and more evenly distributed, effectively improving the performance stability after the lens is assembled.

[0054] On the other hand, the imaging lens according to an embodiment of the present application includes a lens barrel and first to fourth lenses assembled therein and arranged in sequence from the object side to the image side along the optical axis. The first lens has a negative optical power and its image side is concave. The second lens has a positive optical power. The third lens has a positive optical power and its image side is convex. The fourth lens has a positive optical power and its object side is convex. The number of lenses with optical power in the imaging lens is four. Half of the maximum field of view of the imaging lens, semi-fov, the maximum height L of the lens barrel along the optical axis, and the outer diameter D0s of the object-side end face of the lens barrel satisfy the conditional formula 1.25 < tan(semi-fov) × L / D0s < 1.70. There is a third spacer element in direct contact with the image side of the third lens between the third lens and the fourth lens. There is a first spacer element in direct contact with the image side of the first lens between the first lens and the second lens. The reflectivity of the first spacer element in the visible light range is less than 3%, and the outer diameter D1m and the inner diameter d1m of the image side of the first spacer element can satisfy the conditional formula 2.0 < D1m / d1m < 2.8. By reasonably controlling the ratio of the outer diameter to the inner diameter of the image side of the first spacer element, the imaging lens according to an embodiment of the present application can indirectly restrict the outer diameter of the first lens, ensuring that the first lens has a sufficiently long bearing position to meet the assembly stability of the lens.

[0055] On the other hand, the imaging lens according to an embodiment of the present application includes a lens barrel and first to fourth lenses assembled therein and arranged in sequence from the object side to the image side along the optical axis. The first lens has a negative optical power and its image side is concave. The second lens has a positive optical power. The third lens has a positive optical power and its image side is convex. The fourth lens has a positive optical power and its object side is convex. The number of lenses with optical power in the imaging lens is four. There is a third spacer element in direct contact with the image side of the third lens between the third lens and the fourth lens. There is a second spacer element in direct contact with the image side of the second lens between the second lens and the third lens. Half of the maximum field of view of the imaging lens, semi-fov, the maximum height L of the lens barrel along the optical axis, and the outer diameter D0s of the object-side end face of the lens barrel satisfy the conditional formula 1.25 < tan(semi-fov) × L / D0s < 1.70. The effective focal length f2 of the second lens and the outer diameter D2s of the object side of the second spacer element can satisfy the conditional formula 1.35 < f2 / D2s < 5.40. By reasonably restricting the effective focal length of the second lens and the outer diameter of the object side of the second spacer element, the imaging lens according to an embodiment of the present application helps to control the light path in the second lens, and can restrict the outer diameter of the second lens while ensuring the support of the second spacer element for the second lens, ensuring the processability of the second lens.

[0056] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the imaging lens can be changed, and the number of spacer elements can also be changed to obtain the various results and advantages described in this specification. This application does not make specific limitations in this regard. For example, although four lenses are described as an example in the embodiment, the imaging lens is not limited to including four lenses. If necessary, the imaging lens may also include other numbers of lenses. Again, for example, according to needs, the imaging lens may also include other numbers of spacer elements different from those described in the above embodiment.

[0057] The following further describes specific embodiments of the imaging lens applicable to the above embodiments with reference to the drawings.

[0058] Embodiment 1

[0059] The following refers to Figure 2 Describe the imaging lens according to Embodiment 1 of this application.

[0060] As Figure 2 shown, in this embodiment, the imaging lens includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 that are accommodated in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis.

[0061] In this embodiment, the imaging lens further includes a plurality of spacer elements: a first spacer element P1, which is located between the first lens E1 and the second lens E2 and is in direct contact with the image side surface of the first lens E1; a second spacer element P2, which is located between the second lens E2 and the third lens E3 and is in direct contact with the image side surface of the second lens E2; a third spacer element P3, which is located between the third lens E3 and the fourth lens E4 and is in direct contact with the image side surface of the third lens E3; and a third auxiliary spacer element P3b, which is located between the third spacer element P3 and the fourth lens E4 and is in direct contact with the object side surface of the fourth lens E4.

[0062] In this embodiment, the first lens E1 has a negative optical power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a positive optical power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has a positive optical power, its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has a positive optical power, its object side surface S7 is convex, and its image side surface S8 is concave.

[0063] In this embodiment, the aperture STO may be located between the second lens E2 and the third lens E3. In this embodiment, the imaging lens may further include, for example, a filter (not shown in the figure) having an object side surface S9 and an image side surface S10 on the image side of the fourth lens E4, and an imaging surface S11 (not shown in the figure) on the image side of the filter. Light from an object may sequentially pass through the surfaces S1 to S10 and finally be imaged on the imaging surface S11.

[0064] Table 1 shows the basic parameters of the imaging lens of Embodiment 1, where the unit of the radius of curvature Y and the thickness / distance is millimeter (mm).

[0065] Table 1

[0066] In this embodiment, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces, and the surface profiles of the aspherical lenses can be defined by, but not limited to, the following aspherical formula: (1) where is the distance sagitta from the vertex of the aspherical surface when the height of the aspherical surface along the optical axis is h ; c is the paraxial curvature of the aspherical surface, c =1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i -th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order term coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 that can be used for the aspherical surfaces S1 to S8 in this embodiment.

[0067] Table 2

[0068] Referring to Table 7, the numerical values of multiple relevant parameters regarding the lens barrel and each spacer element in this embodiment are shown in the column of 'Embodiment 1' in Table 7. The specific descriptions of the multiple relevant parameters shown in Table 7 are as follows: d3s is the inner diameter of the object side surface of the third spacer element P3, D3s is the outer diameter of the object side surface of the third spacer element P3, L is the maximum height of the lens barrel P0, D0s is the outer diameter of the object side end surface of the lens barrel P0, CP3 is the maximum thickness of the third spacer element P3, EP23 is the distance on the optical axis from the image side surface of the second spacer element P2 to the object side surface of the third spacer element P3, EP01 is the distance on the optical axis from the object side end surface of the lens barrel P0 to the object side surface of the first spacer element P1, D1m is the outer diameter of the image side surface of the first spacer element P1, d1m is the inner diameter of the image side surface of the first spacer element P1, CTx is the central thickness on the optical axis of the x-th lens, Dym is the outer diameter of the image side surface of the y-th spacer element, D2s is the outer diameter of the object side surface of the second spacer element P2, Ra is the curvature radius of the object side surface of the a-th lens, and dbm is the inner diameter of the image side surface of the b-th spacer element. The unit of the numerical values of each of the above parameters shown in Table 7 is millimeter (mm). The schematic illustration of each of the above parameters in the structural diagram of the camera lens can be as Figure 1 shown.

[0069] Embodiment 2

[0070] The following refers to Figure 3 describe the camera lens according to Embodiment 2 of the present application.

[0071] As Figure 3 shown, in this embodiment, similar to Embodiment 1, the camera lens also includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 that are sequentially arranged along the optical axis from the object side to the image side and are accommodated in the lens barrel P0. The camera lens further includes a plurality of spacer elements: a first spacer element P1, which is located between the first lens E1 and the second lens E2 and is in direct contact with the image side surface of the first lens E1; a second spacer element P2, which is located between the second lens E2 and the third lens E3 and is in direct contact with the image side surface of the second lens E2; a third spacer element P3, which is located between the third lens E3 and the fourth lens E4 and is in direct contact with the image side surface of the third lens E3; and a third auxiliary spacer element P3b, which is located between the third spacer element P3 and the fourth lens E4 and is in direct contact with the object side surface of the fourth lens E4.

[0072] Moreover, the basic parameter table of the camera lens in this embodiment is the same as Table 1 in Embodiment 1, and the high-order term coefficient table of the aspherical mirror surface is the same as Table 2 in Embodiment 1.

[0073] The numerical values of the relevant parameters of the camera lens in this embodiment are shown in the column of 'Embodiment 2' in Table 7. Among them, the specific descriptions of the meanings represented by the parameters are the same as those in Embodiment 1 described above, and will not be elaborated here.

[0074] Embodiment 3

[0075] The following refers to Figure 4 Describe the camera lens according to Embodiment 3 of the present application.

[0076] As Figure 4 shown, in this embodiment, similar to Embodiment 1, the camera lens also includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 that are accommodated in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis. The camera lens further includes a plurality of spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image side surface of the third lens E3; and a third auxiliary spacer element P3b, located between the third spacer element P3 and the fourth lens E4 and in direct contact with the object side surface of the fourth lens E4.

[0077] Moreover, the basic parameter table of the camera lens in this embodiment is the same as Table 1 in Embodiment 1, and the high-order term coefficient table of the aspherical mirror surface is the same as Table 2 in Embodiment 1.

[0078] The numerical values of the relevant parameters of the camera lens in this embodiment are shown in the column of 'Embodiment 3' in Table 7. Among them, the specific descriptions of the meanings represented by the parameters are the same as those in Embodiment 1 described above, and will not be elaborated here.

[0079] Figure 5 Shows the axial chromatic aberration curves of the camera lenses of Embodiment 1, Embodiment 2, and Embodiment 3, which represent the deviation of the converging focal points of light rays of different wavelengths after passing through the lens. Figure 6 Shows the astigmatism curves of the camera lenses of Embodiment 1, Embodiment 2, and Embodiment 3, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7 Shows the lateral chromatic aberration curves of the camera lenses of Embodiment 1, Embodiment 2, and Embodiment 3, which represent the deviation of different image heights of light rays on the imaging plane after passing through the lens. Figure 8 Shows the relative illumination curves of Embodiment 1, Embodiment 2, and Embodiment 3, which represent the relative illumination values at different positions of the sensor or the image plane. According to Figures 5 to 8 it can be seen that the camera lenses given in Embodiment 1, Embodiment 2, and Embodiment 3 can achieve good imaging quality.

[0080] Example 4

[0081] The following is a reference to Figure 9 describe the camera lens according to Example 4 of the present application.

[0082] As Figure 9 shown, in this embodiment, the camera lens includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 that are accommodated in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis.

[0083] In this embodiment, the camera lens further includes a plurality of spacer elements: a first spacer element P1, which is located between the first lens E1 and the second lens E2 and is in direct contact with the image side surface of the first lens E1; a second spacer element P2, which is located between the second lens E2 and the third lens E3 and is in direct contact with the image side surface of the second lens E2; a third spacer element P3, which is located between the third lens E3 and the fourth lens E4 and is in direct contact with the image side surface of the third lens E3; and a third auxiliary spacer element P3b, which is located between the third spacer element P3 and the fourth lens E4 and is in direct contact with the object side surface of the fourth lens E4.

[0084] In this embodiment, the first lens E1 has a negative optical power, its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has a positive optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a positive optical power, its object side surface S7 is convex, and its image side surface S8 is convex.

[0085] In this embodiment, the aperture STO can be located between the second lens E2 and the third lens E3. In this embodiment, the camera lens may further include, for example, a filter (not shown in the figure) having an object side surface S9 and an image side surface S10 on the image side of the fourth lens E4 and an imaging surface S11 (not shown in the figure) on the image side of the filter. Light from an object can, for example, sequentially pass through the surfaces S1 to S10 and finally be imaged on the imaging surface S11.

[0086] Table 3 shows the basic parameters of the camera lens of Example 4, where the unit of the radius of curvature Y and the thickness / distance is millimeter (mm).

[0087] Table 3

[0088] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the fourth lens E4 are both aspherical surfaces, and the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. The following Table 4 gives the high-order coefficients of each aspherical mirror surface S1 to S8 that can be used in this embodiment. A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0089] Table 4

[0090] Referring to Table 7, the values of the relevant parameters of the camera lens of this embodiment are respectively shown in the 'Example 4' column of Table 7, wherein the specific description of the meaning represented by each parameter is the same as that in the above Example 1, and will not be repeated here.

[0091] Example 5

[0092] The following reference Figure 10 An imaging lens according to Embodiment 5 of the present application is described.

[0093] like Figure 10 As shown, in this embodiment, similar to Embodiment 4, the camera lens also includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4 which are accommodated in the lens barrel P0 and are arranged in sequence from the object side to the image side along the optical axis. The camera lens also includes a plurality of spacing elements: a first spacing element P1, which is located between the first lens E1 and the second lens E2 and is in direct contact with the image side surface of the first lens E1; a second spacing element P2, which is located between the second lens E2 and the third lens E3 and is in direct contact with the image side surface of the second lens E2; a third spacing element P3, which is located between the third lens E3 and the fourth lens E4 and is in direct contact with the image side surface of the third lens E3; and a third auxiliary spacing element P3b, which is located between the third spacing element P3 and the fourth lens E4 and is in direct contact with the object side surface of the fourth lens E4.

[0094] Furthermore, the basic parameter table of the imaging lens of this embodiment is the same as Table 3 in Embodiment 4, and the high-order coefficient table of the aspherical mirror surface is the same as Table 4 in Embodiment 4.

[0095] The numerical values of the relevant parameters of the camera lens of this embodiment are shown in the column of 'Embodiment 5' in Table 7. Among them, the specific descriptions of the meanings represented by the parameters are the same as those in Embodiment 1 described above, and will not be elaborated here.

[0096] Embodiment 6

[0097] The following refers to Figure 11 Describe the camera lens according to Embodiment 6 of the present application.

[0098] As Figure 11 shown, in this embodiment, similar to Embodiment 4, the camera lens also includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 that are sequentially arranged along the optical axis from the object side to the image side and accommodated in the lens barrel P0. The camera lens also includes a plurality of spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image side surface of the third lens E3; and a third auxiliary spacer element P3b, located between the third spacer element P3 and the fourth lens E4 and in direct contact with the object side surface of the fourth lens E4.

[0099] And, the basic parameter table of the camera lens of this embodiment is the same as Table 3 in Embodiment 4, and the high-order term coefficient table of the aspherical mirror surface is the same as Table 4 in Embodiment 4.

[0100] The numerical values of the relevant parameters of the camera lens of this embodiment are shown in the column of 'Embodiment 6' in Table 7. Among them, the specific descriptions of the meanings represented by the parameters are the same as those in Embodiment 1 described above, and will not be elaborated here.

[0101] Figure 12 Shows the axial chromatic aberration curves of the camera lenses of Embodiment 4, Embodiment 5, and Embodiment 6, which represent the deviation of the converging focal points of light rays of different wavelengths after passing through the lens. Figure 13 Shows the astigmatism curves of the camera lenses of Embodiment 4, Embodiment 5, and Embodiment 6, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 14 Shows the lateral chromatic aberration curves of the camera lenses of Embodiment 4, Embodiment 5, and Embodiment 6, which represent the deviation of different image heights of light rays on the imaging plane after passing through the lens. Figure 15 Shows the relative illumination curves of Embodiment 4, Embodiment 5, and Embodiment 6, which represent the relative illumination values at different positions of the sensor or the image plane. According to Figures 12 to 15 it can be seen that the camera lenses given in Embodiment 4, Embodiment 5, and Embodiment 6 can achieve good imaging quality.

[0102] Embodiment 7

[0103] The following refers to Figure 16 Describe the camera lens according to Embodiment 7 of the present application.

[0104] As Figure 16 shown, in this embodiment, the camera lens includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 that are accommodated in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis.

[0105] In this embodiment, the camera lens further includes a plurality of spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image side surface of the third lens E3; and a third auxiliary spacer element P3b, located between the third spacer element P3 and the fourth lens E4 and in direct contact with the object side surface of the fourth lens E4.

[0106] In this embodiment, the first lens E1 has a negative optical power, its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has a positive optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a positive optical power, its object side surface S7 is convex, and its image side surface S8 is concave.

[0107] In this embodiment, the aperture STO can be located between the second lens E2 and the third lens E3. In this embodiment, the camera lens may further include, for example, a filter (not shown in the figure) having an object side surface S9 and an image side surface S10 on the image side of the fourth lens E4 and an imaging surface S11 (not shown in the figure) on the image side of the filter. Light from an object can, for example, sequentially pass through the surfaces S1 to S10 and finally be imaged on the imaging surface S11.

[0108] Table 5 shows the basic parameters of the camera lens of Embodiment 7, where the unit of the radius of curvature Y and the thickness / distance is millimeter (mm).

[0109] Table 5

[0110] In this embodiment, the object side surface and the image side surface of any lens of the first lens E1 to the fourth lens E4 are both aspherical surfaces, and the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. The following Table 6 gives the high-order coefficients of each aspherical mirror surface S1 to S8 that can be used in this embodiment. A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0111] Table 6

[0112] Referring to Table 7, the values of the relevant parameters of the camera lens of this embodiment are respectively shown in the 'Embodiment 7' column of Table 7, wherein the specific description of the meaning represented by each parameter is the same as that in the above-mentioned Embodiment 1, and will not be repeated here.

[0113] Example 8

[0114] The following reference Figure 17 The imaging lens according to Embodiment 8 of the present application is described.

[0115] like Figure 17 As shown, in this embodiment, similar to Embodiment 7, the camera lens also includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4 which are accommodated in the lens barrel P0 and are arranged in sequence from the object side to the image side along the optical axis. The camera lens also includes a plurality of spacing elements: a first spacing element P1, which is located between the first lens E1 and the second lens E2 and is in direct contact with the image side surface of the first lens E1; a second spacing element P2, which is located between the second lens E2 and the third lens E3 and is in direct contact with the image side surface of the second lens E2; a third spacing element P3, which is located between the third lens E3 and the fourth lens E4 and is in direct contact with the image side surface of the third lens E3; and a third auxiliary spacing element P3b, which is located between the third spacing element P3 and the fourth lens E4 and is in direct contact with the object side surface of the fourth lens E4.

[0116] Furthermore, the basic parameter table of the imaging lens of this embodiment is the same as Table 5 in Embodiment 7, and the high-order coefficient table of the aspherical mirror surface is the same as Table 6 in Embodiment 7.

[0117] The numerical values of the relevant parameters of the camera lens in this embodiment are shown in the column of 'Embodiment 8' in Table 7. Among them, the specific descriptions of the meanings represented by the respective parameters are the same as those in Embodiment 1 described above, and will not be elaborated here.

[0118] Embodiment 9

[0119] The following refers to Figure 18 Describe a camera lens according to Embodiment 9 of the present application.

[0120] As Figure 18 shown, in this embodiment, similar to Embodiment 7, the camera lens also includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 that are accommodated in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis. The camera lens also includes a plurality of spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in direct contact with the image side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in direct contact with the image side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in direct contact with the image side surface of the third lens E3; and a third auxiliary spacer element P3b, located between the third spacer element P3 and the fourth lens E4 and in direct contact with the object side surface of the fourth lens E4.

[0121] And, the basic parameter table of the camera lens in this embodiment is the same as Table 5 in Embodiment 7, and the high-order term coefficient table of the aspherical mirror surface is the same as Table 6 in Embodiment 7.

[0122] The numerical values of the relevant parameters of the camera lens in this embodiment are shown in the column of 'Embodiment 9' in Table 7. Among them, the specific descriptions of the meanings represented by the respective parameters are the same as those in Embodiment 1 described above, and will not be elaborated here.

[0123] Figure 19 Shows the axial chromatic aberration curves of the camera lenses of Embodiment 7, Embodiment 8, and Embodiment 9, which represent the deviation of the convergence focal points of light rays of different wavelengths after passing through the lens. Figure 20 Shows the astigmatism curves of the camera lenses of Embodiment 7, Embodiment 8, and Embodiment 9, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 21 Shows the lateral chromatic aberration curves of the camera lenses of Embodiment 7, Embodiment 8, and Embodiment 9, which represent the deviation of different image heights of light rays on the imaging plane after passing through the lens. Figure 22 Shows the relative illumination curves of the camera lenses of Embodiment 7, Embodiment 8, and Embodiment 9, which represent the relative illumination values at different positions of the sensor or the image plane. According to Figures 19 to 22 it can be seen that the camera lenses given in Embodiment 7, Embodiment 8, and Embodiment 9 can achieve good imaging quality.

[0124] Table 7

[0125] In Examples 1 to 9, the effective focal length f of the camera lens, half of the maximum field of view semi-fov of the camera lens, the effective focal lengths f1-f4 of the respective lenses among the first lens to the fourth lens, the axial distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the effective radius vertex of the image side surface of the third lens, and the axial distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the effective radius vertex of the object side surface of the fourth lens are respectively as shown in Table 8 below.

[0126] Table 8

[0127] In addition, Examples 1 to 9 respectively satisfy the conditions shown in Table 9 below.

[0128] Table 9

[0129] This application also provides an imaging device, which is provided with an electronic photosensitive element for imaging. The electronic photosensitive element can be a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) element. The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the camera lens described above.

[0130] The above description is only the preferred embodiments of this application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of protection involved in this application is not limited to the technical solutions formed by the specific combination of the above technical features, and 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 this application. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. Camera lens, characterized in that, It includes a lens barrel, a lens group assembled in the lens barrel, and at least one spacer element. The number of lenses with optical power in the lens group is four, including a first lens, a second lens, a third lens, and a fourth lens arranged in sequence from the object side to the image side along the optical axis; The first lens has a negative optical power, and its image side is concave; the second lens has a positive optical power; the third lens has a positive optical power, and its image side is convex; the fourth lens has a positive optical power, and its object side is convex; 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 imaging lens satisfies: 1.25 < tan(semi-fov) × L / D0s < 1.70, 0.75 < CT3 / CT4 < 1.10, 1.60 < f3 / D3s < 2.90, and 0.45 < d3s / D3s < 0.85, wherein, semi-fov is half of the maximum field of view angle of the imaging lens, L is the maximum height of the lens barrel along the optical axis direction, D0s is the outer diameter of the object side end face of the lens barrel, CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, f3 is the effective focal length of the third lens, D3s is the outer diameter of the object side face of the third spacer element, and d3s is the inner diameter of the object side face of the third spacer element.

2. The camera lens according to claim 1, characterized in that, The inner diameter d3m of the image side face of the third spacer element and the axial distance SAG41 from the intersection of the object side face of the fourth lens and the optical axis to the vertex of the effective radius of the object side face of the fourth lens satisfy: 4.10 < d3m / SAG41 < 8.

72.

3. The camera lens according to claim 1, wherein The at least one spacer element further 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; The axial distance EP23 from the image side face of the second spacer element to the object side face of the third spacer element on the optical axis and the axial distance SAG32 from the intersection of the image side face of the third lens and the optical axis to the vertex of the effective radius of the image side face of the third lens satisfy: -1.90 < EP23 / SAG32 < -1.0; The effective focal length f3 of the third lens and the effective focal length f of the imaging lens satisfy: 6.60 < f3 / f < 9.

25.

4. The imaging lens according to claim 1, wherein The at least one spacer element further 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; The effective focal length f3 of the third lens, the air space T34 between the third lens and the fourth lens on the optical axis, and the axial distance EP23 from the image side face of the second spacer element to the object side face of the third spacer element on the optical axis satisfy: 9.40 < f3 / (T34 + EP23) < 13.

30.

5. The camera lens according to claim 1, characterized in that, The at least one spacer element further includes: a third auxiliary spacer element located between the third spacer element and the fourth lens and in direct contact with the image side of the third spacer element; The radius of curvature R6 of the image side surface of the third lens and the radius of curvature R7 of the object side surface of the fourth lens satisfy: -8.95 < R6 / R7 < -4.95; The maximum thickness CP3 of the third spacer element, the maximum thickness CP3b of the third auxiliary spacer element, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 4.50 < (CP3 + CP3b) / T34 < 9.

10.

6. The camera lens according to claim 1, wherein The at least one spacer element further includes: a first spacer element located between the first lens and the second lens and in direct contact with the image side surface of the first lens; The distance EP01 on the optical axis from the object side end surface of the lens barrel to the object side surface of the first spacer element, the central thickness CT1 of the first lens on the optical axis, and the radius of curvature R2 of the image side surface of the first lens satisfy: 0.15 < (EP01 - CT1) / R2 < 1.

10.

7. The camera lens according to claim 1, wherein The at least one spacer element further includes: a first spacer element located between the first lens and the second lens and in direct contact with the image side surface of the first lens; The outer diameter D1m and the inner diameter d1m of the image side surface of the first spacer element satisfy: 2.0 < D1m / d1m < 2.

8.

8. The camera lens according to claim 1, wherein The at least one spacer element further includes: a first spacer element located between the first lens and the second lens and in direct contact with the image side surface 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 surface of the second lens; Among the first spacer element, the second spacer element, and the third spacer element, the spacer element with the largest outer diameter is the first spacer element; The central thickness CT2 of the second lens on the optical axis and the outer diameter D1m of the image side surface of the first spacer element satisfy: 0.02 < CT2 / D1m < 0.

10.

9. The camera lens according to claim 1, wherein The at least one spacer element further includes: a second spacer element 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 and the outer diameter D2s of the object side surface of the second spacer element satisfy: 1.35 < f2 / D2s < 5.

40.

10. The camera lens according to claim 1, characterized in that, The effective focal length f2 of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: .

11. The camera lens according to claim 1, characterized in that, The at least one spacer element further includes: a first spacer element located between the first lens and the second lens and in direct contact with the image side surface 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 surface of the second lens; The absolute value of the effective focal length of the second lens is greater than the sum of the absolute values of the effective focal lengths of the first lens and the fourth lens; the absolute value of the effective focal length of the third lens is greater than the sum of the absolute values of the effective focal lengths of the first lens and the fourth lens; The radius of curvature R6 of the image side surface of the third lens and the inner diameter d2m of the image side surface of the second spacer element satisfy: -6.25 < R6 / d2m < -3.50; The effective focal length f2 of the second lens and the inner diameter d1m of the image side surface of the first spacer element satisfy: 2.28 < f2 / d1m < 10.97.

Images