Camera lens

Abstract

The present application discloses a camera lens, which includes a lens barrel, 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 the first to fourth lenses 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 surface is concave; the second, third and fourth lenses all have positive optical powers, and the image side surfaces of the third lens and the object side surfaces of the fourth lens are both convex; at least one spacer element includes a third spacer element located between the third and fourth lenses and in direct contact with the image side surface of the third lens. Half of the maximum field angle semi-fov of the camera lens, the maximum height L of the lens barrel along the optical axis direction and the outer diameter D0s of the object side end surface of the lens barrel satisfy 1.25 < tan(semi-fov) × L / D0s < 1.70; the central thicknesses CT3 and CT4 of the third lens and the fourth lens on the optical axis satisfy 0.75 < CT3 / CT4 < 1.10; the effective focal length f3 of the third lens, the outer diameter D3s and the inner diameter d3s of the object side surface of the third spacer element satisfy 1.60 < f3 / D3s < 2.90 and 0.45 < d3s / D3s < 0.85.

Description

Technical Field

[0001] This application relates to the field of optical elements, and more particularly, 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] This 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 directly contacting the image side of the third lens. The camera lens can satisfy the conditional expressions 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 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 camera 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 between the third lens and the fourth lens on the optical axis, 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 between the third lens and the fourth lens on the optical axis 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 central 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] According to an embodiment of the present application, an imaging lens 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. 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 imaging lens is four. Half of the maximum field 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 imaging 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 imaging lens according to the embodiment of the present application is a wide-angle small-sized lens. The medium thickness of the third lens and the fourth lens is evenly matched. At the same time, 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, restricting the width of the object side of the third spacer element, significantly reducing the stress of the contact element between the third lens and the fourth lens and making the distribution more uniform, effectively improving the performance stability after the lens is assembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] With reference to 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:

[0016] Figure 1 The structure and related parameter schematic diagram of an imaging lens according to an exemplary embodiment of the present application are shown;

[0017] Figure 2 The structural schematic diagram of an imaging lens according to Embodiment 1 of the present application is shown;

[0018] Figure 3 The structural schematic diagram of an imaging lens according to Embodiment 2 of the present application is shown;

[0019] Figure 4 The structural schematic diagram of an imaging lens according to Embodiment 3 of the present application is shown;

[0020] Figures 5 to 8 The on-axis chromatic aberration curve, astigmatism curve, magnification chromatic aberration curve, and relative illuminance curve of the camera lens according to Embodiments 1, 2, and 3 of this application are shown respectively.

[0021] Figure 9 A schematic diagram of the camera lens according to Embodiment 4 of this application is shown;

[0022] Figure 10 A schematic diagram of the camera lens according to Embodiment 5 of this application is shown;

[0023] Figure 11 A schematic diagram of the camera lens according to Embodiment 6 of this application is shown;

[0024] Figures 12 to 15 The on-axis chromatic aberration curve, astigmatism curve, magnification chromatic aberration curve, and relative illuminance curve of the camera lens according to Embodiments 4, 5, and 6 of this application are shown respectively.

[0025] Figure 16 A schematic diagram of the camera lens according to Embodiment 7 of this application is shown;

[0026] Figure 17 A schematic diagram of the camera lens according to Embodiment 8 of this application is shown;

[0027] Figure 18 A schematic diagram of the camera lens according to Embodiment 9 of this application is shown;

[0028] Figures 19 to 22 The on-axis chromatic aberration curve, astigmatism curve, magnification chromatic aberration curve, and relative illuminance curve of the camera lens according to Embodiments 7, 8, and 9 of this application are shown respectively.

[0029] Figure 23 The diagram shows the stress analysis of the camera lens according to Embodiment 1 of this application under the conditions of tan(semi-fov)×L / D0s=1.65, CT3 / CT4=0.78, f3 / D3s=2.54 and d3s / D3s=0.31.

[0030] Figure 24 The diagram shows the stress analysis of the camera lens according to Embodiment 1 of this application under the conditions of tan(semi-fov)×L / D0s=1.65, CT3 / CT4=0.78, f3 / D3s=2.54 and d3s / D3s=0.92.

[0031] Figure 25The diagram shows the stress analysis of the camera lens according to Embodiment 1 of this application under the conditions of tan(semi-fov)×L / D0s=1.65, CT3 / CT4=0.78, f3 / D3s=2.54 and d3s / D3s=0.48. Detailed Implementation

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

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

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

[0035] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to methods commonly used in the art, such as using the sign of the R value (R refers to the radius of curvature of the paraxial region) to determine concavity or convexity. In this paper, the surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens. For the object-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0036] The solutions described in the embodiments of this application can be simulated using software / tools such as ZEMAX and CODE V. For some embodiments, CODE V is preferred for simulation. During the simulation process using software / tools such as those described above, the lens surface profile can be appropriately adjusted based on the surface profile model provided by the software / tool.

[0037] It should also be understood that the terms "comprising," "including," "having," "containing," 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. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0038] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

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

[0041] A camera lens according to an exemplary embodiment of this application may include a lens group and at least one spacer element. The lens group may be, for example, a four-element lens group, including a first lens, a second lens, a third lens, and a fourth lens. In an exemplary embodiment, the first to fourth lenses may be arranged sequentially along the optical axis from the object side to the image side.

[0042] In an exemplary embodiment, the first lens may have negative optical power, and its image-side surface may be concave. The second lens may have positive optical power. The third lens may have positive optical power, and its image-side surface may be convex. The fourth lens may have positive optical power, and its object-side surface may be convex.

[0043] In an exemplary embodiment, the camera lens may further include a lens barrel, a lens group, and at least one spacer element that can be fitted into the lens barrel.

[0044] In an exemplary embodiment, the number of lenses with optical power in the camera lens may be four.

[0045] 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.

[0046] 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 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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. 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 angle of the camera 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 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. Moreover, 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 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 of the third spacer element. However, there will be an unstable bearing situation at the bearing position of the third lens in the non-effective diameter area and the third spacer element. 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, restricting the width of the object side 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.

[0051] See attached Figures 23 to 25 , wherein, Figure 23 Fig. shows the stress analysis diagram of the camera lens according to an exemplary embodiment of the present application (such as Embodiment 1) when satisfying the conditional formulas tan(semi-fov) × L / D0s = 1.65, CT3 / CT4 = 0.78, f3 / D3s = 2.54, and d3s / D3s = 0.31. It can be seen that when assembling the lens that meets the above conditions, there is a large assembly pressure on the third lens, with a high risk of deformation, affecting the optical performance of the lens; Figure 24It shows a 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 It shows a 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. After improving the structure of the third spacer element and its bearing position, Figure 25 the stress condition of the lens shown in 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 camera lens of the embodiment of the present application, by controlling that the half of the maximum field of view angle 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 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 controlling that 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 satisfy the conditional expression 0.45 < d3s / D3s < 0.85, it is possible to have the characteristics of wide - angle miniaturization, uniform thickness matching between the third and fourth lenses, and stray light between the third and fourth lenses can be effectively blocked and absorbed by the object - side surface of the third spacer element, etc., while reasonably restricting the width of the object - side surface of the third spacer element, so that the stress of the bearing elements between the third lens and the fourth lens is significantly reduced and the distribution is more uniform, effectively improving the performance stability after the lens is assembled.

[0052] In an exemplary embodiment, at least one spacer element in the camera lens may further include a first spacer element located between the first lens and the second lens and directly contacting the image - side surface of the first lens. In an exemplary embodiment, the reflectivity of the first spacer element in the visible light range is less than 3%.

[0053] 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 directly contacting the image side surface of the second lens.

[0054] 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 directly contacting the image side surface of the third spacer element.

[0055] 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. While ensuring the lens processing performance of the fourth lens, the risk of stray light at the edge of the effective diameter of the lens is reduced.

[0056] 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.

[0057] In an exemplary embodiment, the camera lens of the present application can satisfy the conditional formula 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 formula 9.40 < f3 / (T34 + EP23) < 13.30 and reasonably controlling the effective focal length of the third lens, it is beneficial to restrict the path of light rays in the third lens; reasonably controlling the air gap between the third and fourth lenses and the distance between the second spacer element and the third spacer element can indirectly restrict the center thickness and edge thickness of the third lens, which is beneficial to ensuring that the lens has a suitable forming thickness ratio.

[0058] In an exemplary embodiment, the camera lens of the present application can satisfy the conditional formulas -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 the optical axis 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 formulas -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 path of light rays in the lens and ensures the final imaging quality; 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 can indirectly ensure the edge thickness to center thickness ratio of the lens, which is beneficial to the forming of the third spacer element, the third auxiliary spacer element and the third lens.

[0059] 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 an appropriate 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 an appropriate space for dispensing and fixing.

[0060] 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.

[0061] 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.

[0062] 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 directly contacting 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, 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 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 to the second lens, ensuring the processability of the second lens.

[0063] 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 curvature radius 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 curvature radius near the optical axis of the image side surface of the second lens helps to control the light path in the second lens, and is also beneficial to ensuring the processability of the second lens.

[0064] 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 directly contacting the image side surface of the first lens, and a second spacer element located between the second lens and the third lens and directly contacting 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 curvature radius 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 the spacer elements on their object sides, beneficial to controlling the light path when the light passes through the lenses, and can reduce the overall sensitivity of the lens.

[0065] In an exemplary embodiment, the object-side surface of the first lens can be convex or concave, and the image-side surface can be concave. The object-side surface of the second lens can be convex or concave, and the image-side surface can be convex or concave. The object-side surface of the third lens can be convex or concave, and the image-side surface can be convex. The object-side surface of the fourth lens can be convex, and the image-side surface can be convex or concave.

[0066] In an exemplary embodiment, the camera lens of this application may include at least one aperture stop. The aperture stop can constrain the optical path and control the light intensity. The aperture stop can be positioned at an appropriate location on the camera lens; for example, it can be positioned between the second lens and the third lens. It should be noted that the above-described aperture stop positions are merely examples and not limitations; in other exemplary embodiments, the aperture stop can also be positioned at other suitable locations as needed.

[0067] In an exemplary embodiment, the object-side and image-side surfaces of the first, second, third, and fourth lenses may include one or more aspherical mirrors. Aspherical mirrors have better radius of curvature characteristics, offering advantages in improving distortion aberrations and astigmatism. Using aspherical mirrors can eliminate aberrations that occur during imaging as much as possible, thereby improving image quality.

[0068] In an exemplary embodiment, the camera lens may optionally include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0069] On the one hand, the camera lens according to an embodiment of the present application includes a lens barrel and the 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 in direct contact with 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 angle of the camera 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 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 the embodiment of the present application is a wide-angle 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 of the third spacer element. However, the contact instability occurs at the contact position between the non-effective diameter region of the third lens and the third spacer element. 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 the distribution is more uniform, effectively improving the performance stability after the lens is assembled.

[0070] On the other 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 focal power and its image side is concave. The second lens has a positive focal power. The third lens has a positive focal power and its image side is convex. The fourth lens has a positive focal power and its object side is convex. The number of lenses with focal power in the camera lens is four. Half of the maximum field angle of the camera lens, semi-fov, the maximum height L of the lens barrel along the optical axis direction 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 directly contacting the image side of the third lens between the third lens and the fourth lens. There is a first spacer element directly contacting 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 camera 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.

[0071] On the other 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 focal power and its image side is concave. The second lens has a positive focal power. The third lens has a positive focal power and its image side is convex. The fourth lens has a positive focal power and its object side is convex. The number of lenses with focal power in the camera lens is four. There is a third spacer element directly contacting the image side of the third lens between the third lens and the fourth lens. There is a second spacer element directly contacting the image side of the second lens between the second lens and the third lens. Half of the maximum field angle of the camera lens, semi-fov, the maximum height L of the lens barrel along the optical axis direction 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 camera 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 to the second lens, ensuring the processability of the second lens.

[0072] 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 camera lens and the number of spacers can be changed to obtain the various results and advantages described in this specification, and this application does not specifically limit them. For example, although four lenses are described as an example in the embodiments, the camera lens is not limited to including four lenses. If necessary, the camera lens may also include other numbers of lenses. As another example, the camera lens may also include other numbers of spacers than those described in the above embodiments, as needed.

[0073] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the camera lens applicable to the above-described embodiments.

[0074] Example 1

[0075] The following is for reference Figure 2 The camera lens according to Embodiment 1 of this application is described.

[0076] like Figure 2 As 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 arranged sequentially along the optical axis from the object side to the image side, housed in the lens barrel P0.

[0077] 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 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 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 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 of the fourth lens E4.

[0078] In this embodiment, the first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave.

[0079] In this embodiment, the aperture stop STO may be located between the second lens E2 and the third lens E3. In this embodiment, the camera lens may also include, for example, a filter (not shown in the figure) located on the image side of the fourth lens E4, having an object side S9 and an image side S10, and an imaging surface S11 (not shown in the figure) located on the image side of the filter. Light from the object may, for example, pass through each surface S1 to S10 sequentially and finally be imaged on the imaging surface S11.

[0080] Table 1 shows the basic parameters of the camera lens in Example 1, where the radius of curvature Y and the thickness / distance are in millimeters (mm).

[0081] Table 1

[0082]

[0083] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces, and the surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0084] (1)

[0085] in, For an aspherical surface along the optical axis at a height of h When the position is such that the distance from the vertex of the non-spherical surface is the sag; c For the paraxial curvature of an aspherical surface, c =1 / R (i.e., paraxial curvature) c (The reciprocal of the radius of curvature R in Table 1 above). k The conic coefficient; Ai Is it an aspherical first i -th order correction coefficients. Table 2 below shows the higher-order coefficients that can be used for each aspherical mirror S1 to S8 in this embodiment. A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0086] Table 2

[0087]

[0088] Referring to Table 7, the values ​​of several relevant parameters concerning the lens barrel and each spacer element in this embodiment are shown in the 'Example 1' column of Table 7. The specific descriptions of the several relevant parameters shown in Table 7 are as follows:

[0089] 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 face 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 face 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 center thickness of the xth lens on the optical axis, Dym is the outer diameter of the image side surface of the yth spacer element, D2s is the outer diameter of the object side surface of the second spacer element P2, Ra is the radius of curvature of the object side surface of the ath lens, and dbm is the inner diameter of the image side surface of the bth spacer element. The units for all parameters shown in Table 7 are millimeters (mm). A schematic diagram of the camera lens structure for each parameter is shown below. Figure 1 As shown.

[0090] Example 2

[0091] The following is for reference Figure 3 Describes a camera lens according to Embodiment 2 of this application.

[0092] like Figure 3 As 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 arranged sequentially along the optical axis from the object side to the image side, housed within the lens barrel P0. The camera lens also includes multiple 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 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 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 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 of the fourth lens E4.

[0093] Furthermore, the basic parameter table of the camera lens in this embodiment is the same as Table 1 in Embodiment 1, and the table of higher-order coefficients of the aspherical mirror is the same as Table 2 in Embodiment 1.

[0094] The values ​​of various relevant parameters of the camera lens in this embodiment are shown in the 'Embodiment 2' column of Table 7. The specific descriptions of the meanings represented by each parameter are the same as those in Embodiment 1 above, and will not be repeated here.

[0095] Example 3

[0096] The following is for reference Figure 4 The camera lens according to Embodiment 3 of this application is described.

[0097] like Figure 4 As 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 arranged sequentially along the optical axis from the object side to the image side, housed within the lens barrel P0. The camera lens also includes multiple 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 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 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 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 of the fourth lens E4.

[0098] Furthermore, the basic parameter table of the camera lens in this embodiment is the same as Table 1 in Embodiment 1, and the table of higher-order coefficients of the aspherical mirror is the same as Table 2 in Embodiment 1.

[0099] The values ​​of various relevant parameters of the camera lens in this embodiment are shown in the 'Embodiment 3' column of Table 7. The specific descriptions of the meanings represented by each parameter are the same as those in Embodiment 1 above, and will not be repeated here.

[0100] Figure 5 The on-axis chromatic aberration curves of the camera lenses of Embodiments 1, 2 and 3 are shown, which represent the deviation of the convergence focal point of light of different wavelengths after passing through the lens. Figure 6 The astigmatism curves of the camera lenses of Embodiments 1, 2 and 3 are shown, which represent the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 7 The magnification chromatic aberration curves of the camera lenses of Embodiments 1, 2 and 3 are shown, which represent the deviation of different image heights on the imaging plane after light passes through the lens. Figure 8 The relative illumination curves for Examples 1, 2, and 3 are shown, representing the relative illumination values ​​at different locations on the sensor or image plane. According to... Figures 5 to 8 It can be seen that the camera lenses given in Embodiments 1, 2 and 3 can achieve good imaging quality.

[0101] Example 4

[0102] The following is for reference Figure 9 The camera lens according to Embodiment 4 of this application is described.

[0103] like Figure 9 As 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 arranged sequentially along the optical axis from the object side to the image side, housed in the lens barrel P0.

[0104] 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 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 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 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 of the fourth lens E4.

[0105] In this embodiment, the first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex.

[0106] In this embodiment, the aperture stop STO may be located between the second lens E2 and the third lens E3. In this embodiment, the camera lens may also include, for example, a filter (not shown in the figure) located on the image side of the fourth lens E4, having an object side S9 and an image side S10, and an imaging surface S11 (not shown in the figure) located on the image side of the filter. Light from the object may, for example, pass through each surface S1 to S10 sequentially and finally be imaged on the imaging surface S11.

[0107] Table 3 shows the basic parameters of the camera lens in Example 4, where the radius of curvature Y and the thickness / distance are in millimeters (mm).

[0108] Table 3

[0109]

[0110] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. The shape of each aspherical surface can be defined by formula (1) given in embodiment 1 above. Table 4 below gives the higher-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 4

[0112]

[0113] Referring to Table 7, the values ​​of various relevant parameters of the camera lens in this embodiment are shown in the 'Embodiment 4' column of Table 7. The specific description of the meaning of each parameter is the same as that in Embodiment 1 above, and will not be repeated here.

[0114] Example 5

[0115] The following is for reference Figure 10 The camera lens according to Embodiment 5 of this application is described.

[0116] 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 arranged sequentially along the optical axis from the object side to the image side, housed within the lens barrel P0. The camera lens also includes multiple 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 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 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 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 of the fourth lens E4.

[0117] Furthermore, the basic parameter table of the camera lens in this embodiment is the same as Table 3 in Embodiment 4, and the table of higher-order coefficients of the aspherical mirror is the same as Table 4 in Embodiment 4.

[0118] The values ​​of various relevant parameters of the camera lens in this embodiment are shown in the 'Embodiment 5' column of Table 7. The specific descriptions of the meanings represented by each parameter are the same as those in Embodiment 1 above, and will not be repeated here.

[0119] Example 6

[0120] The following is for reference Figure 11 The camera lens according to Embodiment 6 of this application is described.

[0121] like Figure 11 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 arranged sequentially along the optical axis from the object side to the image side, housed within the lens barrel P0. The camera lens also includes multiple 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 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 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 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 of the fourth lens E4.

[0122] Furthermore, the basic parameter table of the camera lens in this embodiment is the same as Table 3 in Embodiment 4, and the table of higher-order coefficients of the aspherical mirror is the same as Table 4 in Embodiment 4.

[0123] The values ​​of various relevant parameters of the camera lens in this embodiment are shown in the 'Embodiment 6' column of Table 7. The specific descriptions of the meanings represented by each parameter are the same as those in Embodiment 1 above, and will not be repeated here.

[0124] Figure 12 The on-axis chromatic aberration curves of the camera lenses of Embodiments 4, 5 and 6 are shown, which represent the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 13 The astigmatism curves of the camera lenses of Embodiments 4, 5 and 6 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 14 The magnification chromatic aberration curves of the camera lenses of Embodiments 4, 5 and 6 are shown, which represent the deviation of different image heights on the imaging plane after light passes through the lens. Figure 15The relative illumination curves for Examples 4, 5, and 6 are shown, representing the relative illumination values ​​at different locations on the sensor or image plane. According to... Figures 12 to 15 It can be seen that the camera lenses given in Examples 4, 5 and 6 can achieve good imaging quality.

[0125] Example 7

[0126] The following is for reference Figure 16 The camera lens according to Embodiment 7 of this application is described.

[0127] like Figure 16 As 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 arranged sequentially along the optical axis from the object side to the image side, housed in the lens barrel P0.

[0128] 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 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 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 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 of the fourth lens E4.

[0129] In this embodiment, the first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave.

[0130] In this embodiment, the aperture stop STO may be located between the second lens E2 and the third lens E3. In this embodiment, the camera lens may also include, for example, a filter (not shown in the figure) located on the image side of the fourth lens E4, having an object side S9 and an image side S10, and an imaging surface S11 (not shown in the figure) located on the image side of the filter. Light from the object may, for example, pass through each surface S1 to S10 sequentially and finally be imaged on the imaging surface S11.

[0131] Table 5 shows the basic parameters of the camera lens in Example 7, where the radius of curvature Y and the thickness / distance are in millimeters (mm).

[0132] Table 5

[0133]

[0134] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. The shape of each aspherical surface can be defined by formula (1) given in embodiment 1 above. Table 6 below gives the higher-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 .

[0135] Table 6

[0136]

[0137] Referring to Table 7, the values ​​of various relevant parameters of the camera lens in this embodiment are shown in the 'Embodiment 7' column of Table 7. The specific description of the meaning of each parameter is the same as that in Embodiment 1 above, and will not be repeated here.

[0138] Example 8

[0139] The following is for reference Figure 17 The camera lens according to Embodiment 8 of this application is described.

[0140] 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 arranged sequentially along the optical axis from the object side to the image side, housed within the lens barrel P0. The camera lens also includes multiple 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 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 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 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 of the fourth lens E4.

[0141] Furthermore, the basic parameter table of the camera lens in this embodiment is the same as Table 5 in Embodiment 7, and the table of higher-order coefficients of the aspherical mirror is the same as Table 6 in Embodiment 7.

[0142] The values ​​of various relevant parameters of the camera lens in this embodiment are shown in the 'Embodiment 8' column of Table 7. The specific descriptions of the meanings represented by each parameter are the same as those in Embodiment 1 above, and will not be repeated here.

[0143] Example 9

[0144] The following is for reference Figure 18 The camera lens according to Embodiment 9 of this application is described.

[0145] like Figure 18 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 arranged sequentially along the optical axis from the object side to the image side, housed within the lens barrel P0. The camera lens also includes multiple 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 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 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 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 of the fourth lens E4.

[0146] Furthermore, the basic parameter table of the camera lens in this embodiment is the same as Table 5 in Embodiment 7, and the table of higher-order coefficients of the aspherical mirror is the same as Table 6 in Embodiment 7.

[0147] The values ​​of various relevant parameters of the camera lens in this embodiment are shown in column 'Embodiment 9' of Table 7. The specific descriptions of the meanings represented by each parameter are the same as those in Embodiment 1 above, and will not be repeated here.

[0148] Figure 19 The on-axis chromatic aberration curves of the camera lenses of Embodiments 7, 8 and 9 are shown, which represent the deviation of the convergence focal point of light of different wavelengths after passing through the lens. Figure 20 The astigmatism curves of the camera lenses of Embodiments 7, 8 and 9 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 21 The magnification chromatic aberration curves of the camera lenses of Embodiments 7, 8 and 9 are shown, which represent the deviation of different image heights on the imaging plane after light passes through the lens. Figure 22The relative illumination curves for Examples 7, 8, and 9 are shown, representing the relative illumination values ​​at different locations on the sensor or image plane. According to... Figures 19 to 22 It can be seen that the camera lenses given in Examples 7, 8 and 9 can achieve good imaging quality.

[0149] Table 7

[0150]

[0151] In Examples 1 to 9, the effective focal length f of the camera lens, half of the maximum field of view of the camera lens (semi-fov), the effective focal lengths f1-f4 of each lens in the first to fourth lenses, the axial distance SAG32 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, and the axial distance SAG41 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 are shown in Table 8 below.

[0152] Table 8

[0153]

[0154] Furthermore, Examples 1 to 9 respectively satisfy the conditions shown in Table 9 below.

[0155] Table 9

[0156]

[0157] This application also provides an imaging device equipped 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) device. The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the camera lens described above.

[0158] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of protection involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the concept of this application. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A camera lens, characterized in that, It includes a lens barrel, 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; The at least one spacer element includes: a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and is in direct contact with the image side of the second lens; the third spacer element is located between the third lens and the fourth lens and is in direct contact with the image side of the third lens; The camera lens satisfies: 1.25 < tan(semi - fov) × L / D0s ≤ 1.647, 0.75 < CT3 / CT4 ≤ 1.065, 1.60 < f3 / D3s < 2.90, and 0.45 < d3s / D3s < 0.85, -6.25 < R6 / d2m ≤ -3.555, where, semi - fov is half of the maximum field 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 face of the third spacer element, d3s is the inner diameter of the object - side face of the third spacer element, R6 is the curvature radius of the image side of the third lens, and d2m is the inner diameter of the image side of the second spacer element.

2. The camera lens according to claim 1, characterized in that, 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 satisfy: 4.10 < d3m / SAG41 < 8.

72.

3. The camera lens according to claim 1, wherein, The axial distance EP23 from the image side of the second spacer element to the object side of the third spacer element on the optical axis 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 camera lens satisfy: 6.60 < f3 / f < 9.

25.

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

248.

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, 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 of the first lens; The distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first spacer element on the optical axis, the center 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, 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 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: 2.058≤D1m / d1m<2.

8.

8. 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 of the first lens; The first spacer element is the spacer element with the largest outer diameter among the first spacer element, the second spacer element, and the third spacer element. The center 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, characterized in that, The effective focal length f2 of the second lens and the outer diameter D2s of the object side 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 the following: .

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 of the first 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 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。

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