Optical imaging lens

Abstract

The utility model discloses an optical imaging lens, the optical imaging lens comprises a lens barrel, and a lens group and a spacing element group which are arranged in the lens barrel, and the lens group comprises a first lens, a second lens, a third lens and a fourth lens in sequence from an object side to an image side along an optical axis; the spacer element group includes: a first spacer element disposed on an image side of the first lens and at least partially in contact with an image side surface of the first lens; the curvature radius R2 of the image side surface of the first lens and the inner diameter d1s of the object side surface of the first spacing element meet the following condition: 6.5 < R2 / d1s < 13.5; the effective focal length f1 of the first lens, the refractive index N1 of the first lens and the distance EP01 from the end face of the object side of the lens barrel to the object side face of the first spacing element in the optical axis direction meet the condition that f1 * N1 / EP01 is larger than 5.1 and smaller than 5.53.

Description

Technical Field

[0001] This application relates to the field of optical elements, and specifically, to an optical imaging lens. Background Art

[0002] In recent years, with the rapid development of smart phones, people have higher and higher requirements for mobile phone camera lenses. Telephoto and ultra-thinness have become hot topics for mobile phone manufacturers to compete in publicity.

[0003] A telephoto lens can enhance the focusing ability of light by changing the number and form of lens groups in the lens. On mobile phones, telephoto lenses usually adopt a periscope telephoto structure. By adding a reflecting mirror between the lens and the sensor, the optical path is bent, so as to achieve more powerful optical zoom without increasing the thickness of the mobile phone.

[0004] Currently, periscope telephoto lenses still have some deficiencies. For example, in low-light or complex light environments, periscope telephoto lenses may not be able to be turned on or the imaging quality may decline, and the module volume of periscope telephoto lenses is relatively large. Summary of the Utility Model

[0005] In the first aspect of this application, there is provided such an optical imaging lens, which includes: a lens barrel, and a lens group and a spacer element group disposed in the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, and a fourth lens. The spacer element group includes: a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens. The radius of curvature R2 of the image side surface of the first lens and the inner diameter d1s of the object side surface of the first spacer element satisfy: 6.5 < R2 / d1s < 13.5. The effective focal length f1 of the first lens, the refractive index N1 of the first lens, and the distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element along the optical axis direction satisfy: 5.1 < f1×N1 / EP01 < 5.53.

[0006] In one embodiment, the optical imaging lens satisfies: 2.28 < (CT1 + CP1) / T12 < 4.04, where CT1 is the central thickness of the first lens on the optical axis, CP1 is the maximum thickness of the first spacer element along the optical axis direction, and T12 is the air gap between the first lens and the second lens on the optical axis.

[0007] In one embodiment, the spacer element group further includes: a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; the optical imaging lens satisfies: 5.3 < (EP01 + EP12) / CT2 < 7.4, where EP01 is the distance along the optical axis from the object side end surface of the lens barrel to the object side surface of the first spacer element, EP12 is the distance along the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element, and CT2 is the central thickness of the second lens on the optical axis.

[0008] In one embodiment, the spacer element group further includes: a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; the optical imaging lens satisfies: 2.27 < T23 / EP12 < 2.9, where T23 is the air gap between the second lens and the third lens on the optical axis, and EP12 is the distance along the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element.

[0009] In one embodiment, the optical imaging lens satisfies: 1.3 < d0s / d0m < 1.52, where d0s is the inner diameter of the object side end surface of the lens barrel, and d0m is the inner diameter of the image side end surface of the lens barrel.

[0010] In one embodiment, the spacer element group further includes: a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; the optical imaging lens satisfies: 22.17 < f3×N3 / (CT3 + CP3) < 42.04, where f3 is the effective focal length of the third lens, N3 is the refractive index of the third lens, CT3 is the central thickness of the third lens on the optical axis, and CP3 is the maximum thickness of the third spacer element along the optical axis.

[0011] In one embodiment, the optical imaging lens satisfies: 0.37 < (T12 + T23 + T34) / L < 0.44, where T12 is the air gap between the first lens and the second lens on the optical axis, T23 is the air gap between the second lens and the third lens on the optical axis, T34 is the air gap between the third lens and the fourth lens on the optical axis, and L is the maximum height of the lens barrel along the optical axis.

[0012] In one embodiment, the optical imaging lens satisfies: 0.35 < R1×SAG11 / D1s < 0.42, where R1 is the radius of curvature of the object side surface of the first lens, SAG11 is the axial distance between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, and D1s is the outer diameter of the object side surface of the first spacer element.

[0013] In one embodiment, the optical imaging lens satisfies: 9.47 < R2 / R1 < 18.64, where R1 is the radius of curvature of the object side surface of the first lens, and R2 is the radius of curvature of the image side surface of the first lens.

[0014] In one embodiment, the spacer element group further includes: a second spacer element and a third spacer element, where the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens, and the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the optical imaging lens satisfies: -2.65 < f23 / (D2s + D3s) < -1.1, where f23 is the combined focal length of the second lens and the third lens, D2s is the outer diameter of the object side surface of the second spacer element, and D3s is the outer diameter of the object side surface of the third spacer element.

[0015] In one embodiment, the spacer element group further includes: a second spacer element disposed on the image side of the second lens and at least partially contacting the image side surface of the second lens; the optical imaging lens satisfies: 1.7 < f12 / (d1m + d2s) < 2.1, where f12 is the combined focal length of the first lens and the second lens, d1m is the inner diameter of the image side surface of the first spacer element, and d2s is the inner diameter of the object side surface of the second spacer element.

[0016] In one embodiment, the spacer element group further includes: a second spacer element disposed on the image side of the second lens and at least partially contacting the image side surface of the second lens; the optical imaging lens satisfies: 1.9 < (R3 × R4) / (D2m × d2m) < 3.2, where R3 is the radius of curvature of the object side surface of the second lens, R4 is the radius of curvature of the image side surface of the second lens, D2m is the outer diameter of the image side surface of the second spacer element, and d2m is the inner diameter of the image side surface of the second spacer element.

[0017] In one embodiment, the spacer element group further includes: a second spacer element and a third spacer element, where the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens, and the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the optical imaging lens satisfies: -23.8 < f2 × N2 / EP23 < -6.57, where f2 is the effective focal length of the second lens, N2 is the refractive index of the second lens, and EP23 is the distance along the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element.

[0018] In one embodiment, the spacer element group further includes: a third spacer element disposed on the image side of the third lens and at least partially contacting the image side surface of the third lens; the optical imaging lens satisfies: -7.9 < f4 / D3m < -2.24, where f4 is the effective focal length of the fourth lens, and D3m is the outer diameter of the image side surface of the third spacer element.

[0019] In a second aspect of the present application, there is provided an optical imaging lens, which includes a lens barrel, a lens group and a spacer element group disposed in the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens and a fourth lens. The spacer element group includes a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens. The optical imaging lens satisfies: -7.9 < f4 / D3m < -2.24, where f4 is the effective focal length of the fourth lens, and D3m is the outer diameter of the image side surface of the third spacer element.

[0020] In a third aspect of the present application, there is provided an optical imaging lens, which includes a lens barrel, a lens group and a spacer element group disposed in the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens and a fourth lens. The spacer element group includes a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens. The optical imaging lens satisfies: -23.8 < f2×N2 / EP23 < -6.57, where f2 is the effective focal length of the second lens, N2 is the refractive index of the second lens, and EP23 is the distance along the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element.

[0021] The present application provides a four-piece optical imaging lens, which satisfies 6.5 < R2 / d1s < 13.5 and 5.1 < f1×N1 / EP01 < 5.53. By reasonably controlling the effective focal length, refractive index and surface shape of the image side surface of the first lens, it is beneficial to reduce the risk of welding marks on the first lens, thereby reducing the risk of appearance problems at the welded joints, and is beneficial to effectively control the light incident amount of the first lens and improve the imaging quality of the lens in low-light environments; at the same time, by reasonably setting the inner diameter of the first spacer element, it is beneficial to block certain non-effective light rays, reduce the risk of stray light, and improve the imaging quality of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0023] Figure 1A It shows a structural layout diagram of an optical imaging lens according to the present application and a schematic diagram of some parameters;

[0024] Figure 1B It shows another structural schematic diagram of the optical imaging lens according to the present application;

[0025] Figure 2A and Figure 2B respectively show the relative illumination diagram and MTF diagram of the optical imaging lens according to the present application when R2 / d1s = 13.48 mm and f1×N1 / EP01 = 5.13 mm;

[0026] Figure 2C and Figure 2D respectively show the relative illumination diagram and MTF diagram of the optical imaging lens according to the present application when R2 / d1s = 6.24 mm and f1×N1 / EP01 = 4.79 mm;

[0027] Figure 2E and Figure 2F respectively show the relative illumination diagram and MTF diagram of the optical imaging lens according to the present application when R2 / d1s = 13.86 mm and f1×N1 / EP01 = 5.71 mm;

[0028] Figure 3A shows the structural schematic diagram of the optical imaging lens according to Embodiment 1 of the present application;

[0029] Figure 3B shows the structural schematic diagram of the optical imaging lens according to Embodiment 2 of the present application;

[0030] Figures 4A to 4D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 1 and Embodiment 2 of the present application;

[0031] Figure 5A shows the structural schematic diagram of the optical imaging lens according to Embodiment 3 of the present application;

[0032] Figure 5B shows the structural schematic diagram of the optical imaging lens according to Embodiment 4 of the present application;

[0033] Figures 6A to 6D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 3 and Embodiment 4 of the present application;

[0034] Figure 7A shows the structural schematic diagram of the optical imaging lens according to Embodiment 5 of the present application;

[0035] Figure 7B shows the structural schematic diagram of the optical imaging lens according to Embodiment 6 of the present application; and

[0036] Figures 8A to 8D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 5 and Embodiment 6 of the present application;

[0037] Figure 9A Shows a schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application;

[0038] Figure 9B Shows a schematic structural diagram of an optical imaging lens according to Embodiment 8 of the present application;

[0039] Figures 10A to 10D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Embodiment 7 and Embodiment 8 of the present application. Detailed implementation manners

[0040] To better understand the present application, more detailed descriptions of various aspects of the present application will be made 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 do not 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.

[0041] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0042] In the drawings, for the sake of clarity, the thickness, size, and shape of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only for illustration and are not drawn to an exact scale.

[0043] In this document, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens close to the object to be photographed is called the object side surface of the lens, and the surface of each lens close to the imaging surface is called the image side surface of the lens.

[0044] 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. Further, 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 individual elements in the list. Further, 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.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used herein 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 formal sense unless expressly so defined herein.

[0046] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application 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. For example, the lens group, lens barrel and spacer element in each embodiment of the present application can be arbitrarily combined, and it is not limited that the lens group in one embodiment can only be combined with the lens barrel, spacer element, etc. of this embodiment.

[0047] The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0048] An optical imaging lens according to an exemplary embodiment of the present application includes a lens barrel, and a lens group and a spacer element group disposed in the lens barrel. The lens group may include four lenses having optical power, namely a first lens, a second lens, a third lens and a fourth lens. These four lenses are arranged in sequence along the optical axis from the object side to the image side. There may be a spacing distance between any two adjacent lenses among the first lens to the fourth lens.

[0049] In the exemplary embodiment, the first lens may have a positive optical power, the second lens may have a negative optical power, the third lens may have a positive optical power, and the fourth lens may have a negative optical power.

[0050] In an exemplary embodiment, the spacer element group of the optical imaging lens may include at least one of a first spacer element, a second spacer element, and a third spacer element. The first spacer element is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens. The second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. The third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens.

[0051] It should be understood that the present application does not specifically limit the number of spacer elements. Any number of spacer elements may be included between any two lenses, and the entire optical imaging lens may also include any number of spacer elements. The spacer elements help the optical imaging lens intercept redundant refracted and reflected light paths, reducing the generation of stray light and ghost images. The spacer elements also help increase the auxiliary support between the lens and the lens barrel, which is beneficial to improving problems such as poor assembly stability and low performance yield caused by large step differences between lenses.

[0052] Figure 1A A schematic structural diagram of an optical imaging lens and a schematic diagram of partial parameters according to the present application are shown. Figure 1B Another schematic structural diagram of the optical imaging lens according to the present application is shown. For clarity, Figure 1A only the reference numerals of partial parameters of the lens barrel and the spacer elements are shown in the figure. For the reference numerals of the lens barrel, lenses, and spacer elements, please refer to Figure 1B . As Figure 1A and Figure 1B shown, an imaging system according to the present application may include a lens barrel P0, a lens group, and a spacer element group. The lens group sequentially includes, along the optical axis, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The spacer element group includes a first spacer element P1, a second spacer element P2, and a third spacer element P3. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens. The second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. The third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens.

[0053] As Figure 1AAs shown, EP01 is the distance from the object side end face of the lens barrel to the object side face of the first spacing element along the optical axis direction, EP12 is the distance from the image side face of the first spacing element to the object side face of the second spacing element along the optical axis direction, EP23 is the distance from the image side face of the second spacing element to the object side face of the third spacing element along the optical axis direction, CP1 is the maximum thickness of the first spacing element along the optical axis direction, CP3 is the maximum thickness of the third spacing element along the optical axis direction, L is the maximum height of the lens barrel along the optical axis direction (i.e., the distance from the object side face of the lens barrel to the image side face of the lens barrel on the optical axis), d1s is the object side face of the first spacing element The inner diameter of the side surface, d2s is the inner diameter of the object side surface of the second spacing element, D3s is the outer diameter of the object side surface of the third spacing element, D2s is the outer diameter of the object side surface of the second spacing element, D1s is the outer diameter of the object side surface of the first spacing element, d0s is the inner diameter of the object side end surface of the lens barrel, d2m is the inner diameter of the image side surface of the second spacing element, d3m represents the inner diameter of the image side surface of the third spacing element, d1m is the inner diameter of the image side surface of the first spacing element, d0m is the inner diameter of the image side end surface of the lens barrel, D3m is the outer diameter of the image side surface of the third spacing element, and D2m is the outer diameter of the image side surface of the second spacing element.

[0054] Those skilled in the art should understand that some parameters of lenses commonly used in the art (such as the center thickness CT1 of the first lens on the optical axis) are not specified in the present invention. Figure 1A It is shown in Figure 1A Only some parameters of a lens barrel and a spacer element of an optical imaging lens of the present application are exemplified to facilitate a better understanding of the present invention.

[0055] according to Figure 1B It can be seen from another structural schematic diagram of the optical imaging lens of the present application that the optical imaging lens further includes a reflective element F disposed on the object side of the first lens, and the reflective element F may have an incident surface S01, a reflective surface S02, and an exit surface S03. The reflective element F is used to change the propagation direction of the light. Exemplarily, the reflective element F may be a prism. The light from the object passes through the incident surface S01 to the reflective surface S02, and then is reflected by the reflective surface S02 to the exit surface S03. The light emitted from the exit surface S03 passes through the first lens E1, the second lens E2, the third lens E3, and the fourth lens E4 in sequence and is finally projected onto the imaging surface (not shown).

[0056] The optical imaging lens according to the present application may be provided with or without a reflective element F as required. By adding a reflective element between the lens group and the sensor, the optical path can be bent, thereby achieving a more powerful optical zoom without increasing the thickness of the mobile phone.

[0057] In an exemplary embodiment, at least one trimmed lens may be included in the lens group. The outer peripheral surface of the trimmed lens may have a trimmed portion and an untrimmed portion, and the outer diameter of the trimmed portion of the lens is smaller than the outer diameter of the untrimmed portion of the lens. When the outer peripheral surface of the lens has a trimmed portion, the outer diameter of the lens generally refers to the outer diameter of the untrimmed portion of the lens, and the outer diameter of the spacer element generally refers to the maximum outer diameter of the untrimmed portion.

[0058] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 6.5 < R2 / d1s < 13.5, where R2 is the radius of curvature of the image side surface of the first lens, and d1s is the inner diameter of the object side surface of the first spacer element. Satisfying 6.5 < R2 / d1s < 13.5 can effectively control the surface shape of the first lens, ensure that the surface shape curve of the image side surface of the first lens is gentle, the sol wavefront curve is relatively gentle during injection molding, there is no phenomenon of convergence and wrapping, and the risk of weld lines is reduced, thereby reducing the risk of appearance problems at the weld lines.

[0059] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 5.1 < f1×N1 / EP01 < 5.53, where f1 is the effective focal length of the first lens, N1 is the refractive index of the first lens, and EP01 is the distance from the object side end face of the lens barrel to the object side surface of the first spacer element along the optical axis. Satisfying 5.1 < f1×N1 / EP01 < 5.53 can effectively control the light incident amount of the first lens and ensure the imaging quality of the system.

[0060] The optical imaging lens according to an exemplary embodiment of the present application includes: a lens barrel, and a lens group and a spacer element group disposed in the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, and a fourth lens. The spacer element group includes: a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens. The optical imaging lens satisfies 6.5 < R2 / d1s < 13.5 and 5.1 < f1×N1 / EP01 < 5.53. By reasonably controlling the effective focal length, refractive index, and surface shape of the image side surface of the first lens, it is beneficial to reduce the risk of weld lines of the first lens, thereby reducing the risk of appearance problems at the weld lines, and is beneficial to effectively controlling the light incident amount of the first lens and improving the imaging quality of the lens in low-light environments; at the same time, by reasonably setting the inner diameter of the first spacer element, it is beneficial to block certain non-effective light rays, reduce the risk of stray light, and improve the imaging quality of the optical imaging lens.

[0061] The optical imaging lens of the present application satisfies 6.5 < R2 / d1s < 13.5 and 5.1 < f1×N1 / EP01 < 5.53, which is beneficial to effectively control the light input amount of the first lens and improve the imaging quality of the lens in low-light environments. At the same time, by reasonably setting the inner diameter of the first spacer element, it is beneficial to block certain non-effective light rays, reduce the risk of stray light, and improve the imaging quality of the optical imaging lens. The following will further illustrate the role of the technical solution of the present application in improving relative illuminance and imaging quality in combination with Figures 2A to 2F , further illustrate the role of the technical solution of the present application in improving relative illuminance and imaging quality.

[0062] Figure 2A and Figure 2B respectively show the relative illuminance diagram and MTF diagram of the optical imaging lens according to the present application when R2 / d1s = 13.48 mm and f1×N1 / EP01 = 5.13 mm. Figure 2C and Figure 2D respectively show the relative illuminance diagram and MTF diagram of the optical imaging lens according to the present application when R2 / d1s = 6.24 mm and f1×N1 / EP01 = 4.79 mm. Figure 2E and Figure 2F respectively show the relative illuminance diagram and MTF diagram of the optical imaging lens according to the present application when R2 / d1s = 13.86 mm and f1×N1 / EP01 = 5.71 mm. Figure 2A , Figure 2C and Figure 2E represent the relative illuminance values on the imaging surfaces corresponding to different fields of view. The horizontal axis represents the field of view (unit: mm), and the vertical axis represents the relative illuminance (unit: %).

[0063] MTF is a quantitative evaluation index for the optical performance of the lens, used to describe the intensity of light transmitted at different spatial frequencies. Figure 2B , Figure 2D and Figure 2F show the MTF values corresponding to different image heights at a spatial frequency of 98 lp / mm. The horizontal axis represents the image height (unit: mm), and the vertical axis represents the MTF value. In Figure 2B , Figure 2D and Figure 2F , sagittal represents the sagittal direction, and tangential represents the meridional direction.

[0064] From Figure 2A it can be seen that when the optical imaging lens satisfies R2 / d1s = 13.48 mm and f1×N1 / EP01 = 5.13 mm, that is, when it satisfies 6.5 < R2 / d1s < 13.5 and 5.1 < f1×N1 / EP01 < 5.53 of the present application, the relative illuminance at the maximum field of view is higher than 50%. Figure 2BThe MTF in the sagittal direction at the maximum image height at a spatial frequency of 98 lp / mm is greater than 0.7, the MTF in the meridional direction is greater than 0.6, and the consistency of the MTF curves in the sagittal and meridional directions is relatively good.

[0065] From Figure 2C it can be seen that when the optical imaging lens satisfies R2 / d1s = 6.24 mm and f1×N1 / EP01 = 4.79 mm, that is, when it does not satisfy 6.5 < R2 / d1s < 13.5 and 5.1 < f1×N1 / EP01 < 5.53 of this application, the relative illuminance at the maximum field of view is lower than 50%. Figure 2D The MTF in the sagittal direction at the maximum image height at a spatial frequency of 98 lp / mm is less than 0.7, the MTF in the meridional direction is less than 0.6, and the consistency of the MTF curves in the sagittal and meridional directions is relatively poor.

[0066] From Figure 2E it can be seen that when the optical imaging lens satisfies R2 / d1s = 13.86 mm and f1×N1 / EP01 = 5.71 mm, that is, when it does not satisfy 6.5 < R2 / d1s < 13.5 and 5.1 < f1×N1 / EP01 < 5.53 of this application, the relative illuminance at the maximum field of view is lower than 50%; Figure 2F The MTF in the sagittal direction at the maximum image height at a spatial frequency of 98 lp / mm is less than 0.3, the MTF in the meridional direction is less than 0.5, and the consistency of the MTF curves in the sagittal and meridional directions is relatively poor.

[0067] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 2.28 < (CT1 + CP1) / T12 < 4.04, where CT1 is the central thickness of the first lens on the optical axis, CP1 is the maximum thickness of the first spacer element along the optical axis direction, and T12 is the air gap between the first lens and the second lens on the optical axis. By controlling the ratio of the sum of the central thickness CT1 of the first lens and the thickness CP1 of the first spacer element to the air gap T12 between the first lens and the second lens, it is beneficial to reasonably restrict the thickness of the first spacer element on the premise of ensuring that the central thickness of the first lens meets the requirements of the molding process, so that the light is effectively diverged after passing through the first lens, and at the same time, the first lens bears the corresponding third-order distortion aberration amount, so that the system can reasonably control the distortion.

[0068] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 5.3 < (EP01 + EP12) / CT2 < 7.4, where EP01 is the distance from the object-side end face of the EP01 barrel to the object-side surface of the first spacer element along the optical axis, EP12 is the distance from the image-side surface of the first spacer element to the object-side surface of the second spacer element along the optical axis, and CT2 is the central thickness of the second lens on the optical axis. By restricting the distance EP12 from the image-side surface of the first spacer element to the object-side surface of the second spacer element along the optical axis, it helps to restrict the edge thickness of the second lens to satisfy 5.3 < (EP01 + EP12) / CT2 < 7.4. When the distance EP01 from the object-side end face of the barrel to the object-side surface of the first spacer element along the optical axis is fixed, it helps to control the ratio of the edge thickness to the central thickness of the second lens, enabling the second lens to have good processability and reducing the difficulty of processing and assembly.

[0069] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 2.27 < T23 / EP12 < 2.9, where T23 is the air gap between the second lens and the third lens on the optical axis, and EP12 is the distance from the image-side surface of the first spacer element to the object-side surface of the second spacer element along the optical axis. By reasonably controlling the gap T23 between the second lens and the third lens to avoid too small a lens gap and reduce the assembly difficulty, and by controlling the gap EP12 between the first spacer element and the second spacer element along the optical axis, it helps to control the edge thickness of the second lens and reduce the difficulty of forming the second lens. By controlling the ratio of T23 to EP12 to satisfy 2.27 < T23 / EP12 < 2.9, it is beneficial to maintain the assembly stability of the first three lenses (i.e., the first lens to the third lens) while reducing the assembly difficulty.

[0070] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.3 < d0s / d0m < 1.52, where d0s is the inner diameter of the object-side end face of the barrel, and d0m is the inner diameter of the image-side end face of the barrel. The inner diameter d0s of the object-side surface of the barrel and its inner diameter d0m of the image-side end face determine the degree of light path occlusion by the barrel. Satisfying 1.3 < d0s / d0m < 1.52 can effectively control the amount of incident light of the optical imaging lens and ensure the angular range in which the light beam in the object space can be imaged on the chip image plane after passing through the optical imaging lens.

[0071] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 22.17 < f3×N3 / (CT3+CP3) < 42.04, where f3 is the effective focal length of the third lens, N3 is the refractive index of the third lens, CT3 is the central thickness of the third lens on the optical axis, and CP3 is the maximum thickness of the third spacer element along the optical axis direction. Satisfying 22.17 < f3×N3 / (CT3+CP3) < 42.04 and controlling the maximum thickness CP3 of the third spacer element, the refractive index N3 of the third lens, and the effective focal length f3 of the third lens helps to improve the assembly stability of the lens. Controlling the central thickness CT3 of the third lens on the optical axis and the maximum thickness CP3 of the third spacer element helps the third spacer element achieve the effect of stray light improvement, thereby enhancing the imaging quality of the lens.

[0072] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.37 < (T12+T23+T34) / L < 0.44, where T12 is the air gap between the first lens and the second lens on the optical axis, T23 is the air gap between the second lens and the third lens on the optical axis, T34 is the air gap between the third lens and the fourth lens on the optical axis, and L is the maximum height of the lens barrel along the optical axis direction. Satisfying 0.37 < (T12+T23+T34) / L < 0.44 and reasonably allocating the ratio of the sum of the air gaps between the first lens, the second lens, the third lens, and the fourth lens on the optical axis to the height L of the lens barrel meets the processability of the lenses, can effectively reduce the size of the optical imaging lens, and avoid the excessive volume of the lens group of the optical imaging lens.

[0073] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.35 < R1×SAG11 / D1s < 0.42, where R1 is the radius of curvature of the object side surface of the first lens, SAG11 is the axial distance between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, and D1s is the outer diameter of the object side surface of the first spacer element. By controlling the ratio of the axial distance SAG11 between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens to the outer diameter D1s of the object side surface of the first spacer element, the first lens has a greater refractive power for off-axis fields, which is beneficial to shortening the overall length of the lens and also beneficial to improving the resolution of the system.

[0074] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 9.47 < R2 / R1 < 18.64, where R1 is the radius of curvature of the object side surface of the first lens and R2 is the radius of curvature of the image side surface of the first lens. By controlling the radii of curvature of the object side surface and the image side surface of the first lens to satisfy 9.47 < R2 / R1 < 18.64, it helps to reduce the generation of spherical aberration and astigmatism.

[0075] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: -2.65 < f23 / (D2s + D3s) < -1.1, where f23 is the combined focal length of the second lens and the third lens, D2s is the outer diameter of the object side surface of the second spacer element, and D3s is the outer diameter of the object side surface of the third spacer element. Satisfying -2.65 < f23 / (D2s + D3s) < -1.1 and controlling the ratio of the combined focal length f23 of the second lens and the third lens to the sum of the outer diameter D2s of the object side surface of the second spacer element and the outer diameter D3s of the object side surface of the third spacer element within a certain range is beneficial for the second lens to have a larger imaging surface and makes the spatial distribution of the second lens in the optical imaging lens more reasonable.

[0076] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 1.7 < f12 / (d1m + d2s) < 2.1, where f12 is the combined focal length of the first lens and the second lens, d1m is the inner diameter of the image side surface of the first spacer element, and d2s is the inner diameter of the object side surface of the second spacer element. The inner diameter d1m of the image side surface of the first spacer element and the inner diameter d2s of the object side surface of the second spacer element respectively determine the light output of the first lens and the light input of the second lens. Controlling the combined focal length f12 of the first lens and the second lens, the inner diameter d1m of the image side surface of the first spacer element, and the inner diameter d2s of the object side surface of the second spacer element to satisfy 1.7 < f12 / (d1m + d2s) < 2.1 can increase the light flux of the system, enhance the imaging effect in a dark environment; at the same time, it can reduce the aberration of the edge field of view.

[0077] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 1.9 < (R3 × R4) / (D2m × d2m) < 3.2, where R3 is the curvature radius of the object side surface of the second lens, R4 is the curvature radius of the image side surface of the second lens, D2m is the outer diameter of the image side surface of the second spacer element, and d2m is the inner diameter of the image side surface of the second spacer element. The curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens determine the overall contour of the second lens. The inner diameter d2m of the image side surface of the second spacer element and the outer diameter D2m of the image side surface of the second spacer element determine the contact area between the second spacer element and the object side surface of the third lens. Controlling the curvature radius R3 of the object side surface of the second lens, the curvature radius R4 of the image side surface of the second lens, the inner diameter d2m of the image side surface of the second spacer element, and the outer diameter D2m of the image side surface of the second spacer element to satisfy 1.9 < (R3 × R4) / (D2m × d2m) < 3.2 ensures better assembly stability of the second lens.

[0078] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: -23.8 < f2×N2 / EP23 < -6.57, where f2 is the effective focal length of the second lens, N2 is the refractive index of the second lens, and EP23 is the distance along the optical axis from the image side of the second spacer element to the object side of the third spacer element. The object side of the second lens is convex, which helps more light to enter the optical imaging lens. The second lens with positive optical power can make the incident light enter the optical imaging lens more completely, reduce energy loss, and improve the imaging quality of the optical imaging lens; controlling the distance EP23 along the optical axis between the image side of the second spacer element and the image side of the third spacer element helps to control the edge thickness of the third lens and reduce the difficulty of forming the third lens; controlling the effective focal length f2 of the second lens, the refractive index N2 of the second lens, and the distance EP23 along the optical axis between the image side of the second spacer element and the image side of the third spacer element to satisfy -23.8 < f2×N2 / EP23 < -6.57 can control the curvature of the image side of the second lens, effectively reduce axial chromatic aberration, ensure good imaging quality, and reasonably control the values of f2, N2, and EP23 can better ensure the imaging quality of the second lens and reduce the internal stray light of the second lens.

[0079] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: -7.9 < f4 / D3m < -2.24, where f4 is the effective focal length of the fourth lens and D3m is the outer diameter of the image side of the third spacer element. Satisfying -7.9 < f4 / D3m < -2.24 is beneficial to meet the assembly requirements of the third spacer element and improve the stray light situation. Affected by the thickness of the spacer element, the more complex the structure of the spacer element, the more complex the stray light state. By controlling the ratio of the effective focal length of the third lens to the outer diameter of the image side of the third spacer element within a reasonable value range, it is beneficial to improve the reflected stray light of the third spacer element, thereby improving the imaging quality of the system.

[0080] The optical imaging lens according to an exemplary embodiment of the present application includes: a lens barrel, and a lens group and a spacer element group disposed within the lens barrel. Among them, the lens group includes, in sequence from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, and a fourth lens. The spacer element group includes: a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side of the third lens. The optical imaging lens satisfies: -7.9 < f4 / D3m < -2.24, where f4 is the effective focal length of the fourth lens and D3m is the outer diameter of the image side of the third spacer element. By controlling the ratio of the effective focal length of the third lens to the outer diameter of the image side of the third spacer element within a reasonable value range in the present application, it is beneficial to meet the assembly requirements of the third lens and the third spacer element, improve the assembly stability, and improve the imaging quality of the system.

[0081] An optical imaging lens according to an exemplary embodiment of the present application includes: a lens barrel, and a lens group and a spacer element group disposed within the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, and a fourth lens. The spacer element group includes: a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens. This optical imaging lens satisfies: -23.8 < f2×N2 / EP23 < -6.57, where f2 is the effective focal length of the second lens, N2 is the refractive index of the second lens, and EP23 is the distance along the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element. The object side surface of the second lens is convex, which helps more light to enter the optical imaging lens. The second lens with a positive optical power can make the incident light enter the optical imaging lens more completely, reduce energy loss, and improve the imaging quality of the optical imaging lens; controlling the distance EP23 along the optical axis between the image side surface of the second spacer element and the image side surface of the third spacer element helps to control the edge thickness of the third lens and reduce the difficulty of forming the third lens; controlling the effective focal length f2 of the second lens, the refractive index N2 of the second lens, and the distance EP23 along the optical axis between the image side surface of the second spacer element and the image side surface of the third spacer element to satisfy -23.8 < f2×N2 / EP23 < -6.57 can control the curvature of the image side surface of the second lens, effectively reduce axial chromatic aberration, ensure good imaging quality, and reasonably control the values of f2, N2, and EP23 can better guarantee the imaging quality of the second lens and reduce the internal stray light of the second lens.

[0082] In an embodiment of the present application, at least one of the lens surfaces of each lens is an aspherical lens surface, that is, at least one of the lens surfaces from the object side surface of the first lens to the image side surface of the fourth lens is an aspherical lens surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate as much aberration as possible during imaging, thereby improving the imaging quality. Optionally, the object side surfaces and image side surfaces of all the lenses from the first lens to the fourth lens are aspherical lens surfaces.

[0083] In an exemplary embodiment, the above optical 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.

[0084] The optical imaging lens according to an exemplary embodiment of the present application has a telephoto characteristic. In an application, the optical imaging lens according to an exemplary embodiment of the present application can be applied to the design of a periscope lens, and its length direction is arranged along the vertical or horizontal direction of the electronic device, so as to achieve the purpose of reducing the thickness of the electronic device body.

[0085] The optical imaging lens according to the above embodiment of the present application can adopt multiple lenses, such as the four lenses mentioned above. By reasonably setting each lens of the optical imaging lens, the telephoto characteristic of the lens is realized, so that a good telephoto shooting effect can be achieved. The four-piece imaging lens provided by the present application can better meet specific photography requirements, and at the same time brings requirements in terms of volume, weight, and cost. However, those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although four lenses are described as an example in the embodiment, the optical imaging lens is not limited to including four lenses. If necessary, the optical imaging lens may further include other numbers of lenses.

[0086] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the drawings. Specifically, refer to Figures 3A to 4D Describe the optical imaging lens 1001 of Embodiment 1 and the optical imaging lens 1002 of Embodiment 2 according to the present application; refer to Figures 5A to 6D Describe the optical imaging lens 2001 of Embodiment 3 and the optical imaging lens 2002 of Embodiment 4 according to the present application; refer to Figures 7A to 8D Describe the optical imaging lens 3001 of Embodiment 5 and the optical imaging lens 3002 of Embodiment 6 according to the present application; refer to Figures 9A to 10D Describe the optical imaging lens 4001 of Embodiment 7 and the optical imaging lens 4002 of Embodiment 8 according to the present application.

[0087] Example 1

[0088] Figure 3A A schematic structural diagram of the optical imaging lens 1001 according to Embodiment 1 of the present application is shown. As Figure 3A shown, the optical imaging lens 1001 includes a lens barrel P0, a lens group, and a spacer element group.

[0089] As Figure 3AAs shown, the lens group of the optical imaging lens 1001 sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8.

[0090] The optical imaging lens 1001 further includes a filter (not shown) for correcting color deviation, and the filter has an object side surface S9 and an image side surface S10. The optical imaging lens 1001 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens. Light from an object sequentially passes through the surfaces S1 to S10 and finally forms an image on an imaging surface S11 (not shown).

[0091] Table 1 shows the basic parameter table of the lens group of the optical imaging lens 1001 in Embodiment 1, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0092]

[0093] Table 1

[0094] In Embodiment 1, 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 profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0095]

[0096] where x is the distance sag from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis direction; 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 correction coefficient of the i-th order of the aspherical surface. Tables 2-1 and 2-2 give the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 that can be used for the aspherical surfaces S1-S8 in Embodiment 1.

[0097] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.31E-02 -7.74E-03 -2.34E-03 -6.33E-04 -1.71E-04 -4.31E-05 -1.18E-05 S2 -1.95E-02 -3.91E-03 -6.04E-04 -1.49E-04 -3.28E-05 -4.07E-06 -1.63E-06 S3 3.86E-02 4.83E-03 2.53E-03 -5.58E-04 -2.39E-04 -1.46E-04 -5.72E-05 S4 5.38E-02 6.21E-03 2.24E-03 4.46E-04 1.20E-04 3.13E-05 5.37E-06 S5 8.15E-02 2.53E-03 7.95E-04 1.08E-04 5.95E-06 6.44E-06 -2.39E-06 S6 5.11E-02 4.38E-03 -1.14E-03 6.75E-04 -1.57E-04 7.50E-05 -2.09E-05 S7 -3.17E-01 7.35E-03 -6.86E-03 8.03E-04 -4.45E-04 1.18E-04 -4.03E-05 S8 -4.15E-01 2.09E-02 -6.72E-03 9.39E-04 -3.26E-04 6.72E-05 -2.43E-05

[0098] Table 2-1

[0099]

[0100]

[0101] Table 2-2

[0102] Table 3 shows some basic parameters of the optical imaging lens 1001 of Embodiment 1, where f12 is the combined focal length of the first lens and the second lens, f23 is the combined focal length of the second lens and the third lens, and SAG11 is the axial distance between the intersection of the object side of the first lens and the optical axis and the vertex of the effective radius of the object side of the first lens. The units of f12, f23, and SAG11 in Table 3 are millimeters (mm).

[0103] Parameter f12 f23 SAG11 Value 10.55 -18.25 0.92

[0104] Table 3

[0105] As Figure 3A shown, the optical imaging lens 1001 further includes at least 3 spacer elements, Figure 3A and the first spacer element P1, the second spacer element P2, and the third spacer element P3 are shown therein. The first spacer element P1 is disposed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens. Table 4 shows the basic parameter table of the spacer elements of the optical imaging lens 1001, and the units of the parameters in Table 4 are all millimeters (mm). The above spacer elements can block external redundant light from entering, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging lens 1001.

[0106] Parameter d1s d1m D1s d2s d2m D2s D2m D3s D3m Value 3.493 3.493 5.800 2.443 2.443 4.880 4.880 4.720 4.720 Parameter d0s d0m EP01 EP12 EP23 CP1 CP3 L / Value 6.014 4.551 1.459 0.539 0.671 0.018 0.022 5.423 /

[0107] Table 4

[0108] Example 2

[0109] Figure 3B shows a schematic structural diagram of the optical imaging lens 1002 according to Embodiment 2 of the present application. In this embodiment, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted.

[0110] As Figure 3BAs shown in the figure, the optical imaging lens 1002 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens 1002 is exactly the same as that of the optical imaging lens 1001 in Embodiment 1 and will not be described in detail here. The optical imaging lens 1002 further includes a filter (not shown) for correcting color deviation, and the filter has an object side S9 and an image side S10. The optical imaging lens 1002 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens. Light from an object sequentially passes through each surface S1 to S10 and finally forms an image on an imaging surface S11 (not shown). The basic parameters of the optical imaging lens 1002 are shown in Tables 1 to 3 in detail.

[0111] As Figure 3B shown, the optical imaging lens 1002 further includes at least three spacer elements Figure 3B and the first spacer element P1, the second spacer element P2, and the third spacer element P3 are shown in the figure. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens. Table 5 shows the basic parameter table of the spacer elements of the optical imaging lens 1002, and the unit of each parameter in Table 5 is millimeter (mm). The above spacer elements can block external redundant light from entering, enable the lens and the lens barrel to better bear against each other, and enhance the structural stability of the optical imaging lens 1002.

[0112]

[0113]

[0114] Table 5

[0115] Figure 4A shows the axial chromatic aberration curves of the optical imaging lens 1001 in Embodiment 1 and the optical imaging lens 1002 in Embodiment 2, which represent the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 4B shows the astigmatism curves of the optical imaging lens 1001 in Embodiment 1 and the optical imaging lens 1002 in Embodiment 2, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 4C shows the distortion curves of the optical imaging lens 1001 in Embodiment 1 and the optical imaging lens 1002 in Embodiment 2, which represent the distortion magnitude values corresponding to different image heights. Figure 4D shows the lateral chromatic aberration curves of the optical imaging lens 1001 in Embodiment 1 and the optical imaging lens 1002 in Embodiment 2, which represent the deviation of different image heights of light rays on the imaging surface after passing through the lens. According to Figures 4A to 4DIt can be seen that the optical imaging lens 1001 of Embodiment 1 and the optical imaging lens 1002 of Embodiment 2 can achieve good imaging quality.

[0116] Example 3

[0117] Figure 5A The structural schematic diagram of the optical imaging lens 2001 according to Embodiment 3 of the present application is shown. As Figure 5A shown, the optical imaging lens 2001 includes a lens barrel P0, a lens group, and a spacer element group.

[0118] As Figure 5A shown, the lens group of the optical imaging lens 2001 includes, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8.

[0119] The optical imaging lens 2001 further includes a filter (not shown) for correcting color deviation, and the filter has an object side surface S9 and an image side surface S10. The optical imaging lens 2001 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens. Light from an object sequentially passes through the surfaces S1 to S10 and finally forms an image on an imaging surface S11 (not shown).

[0120] Table 6 shows the basic parameter table of the lens group of the optical imaging lens 2001 of Embodiment 3, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm). Tables 7-1 and 7-2 show the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 3, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0121]

[0122] Table 6

[0123]

[0124]

[0125] Table 7-1

[0126] Face number A18 A20 A22 A24 A26 A28 A30 S1 4.80E-07 7.58E-07 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S2 -6.29E-05 -2.19E-05 -4.35E-06 -4.00E-07 0.00E+00 0.00E+00 0.00E+00 S3 -4.27E-05 -1.06E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S4 3.58E-06 4.30E-08 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S5 6.84E-07 -3.90E-07 4.91E-08 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S6 5.77E-06 7.60E-07 -5.67E-07 1.28E-07 0.00E+00 0.00E+00 0.00E+00 S7 2.03E-05 -4.33E-06 2.42E-06 2.11E-06 0.00E+00 0.00E+00 0.00E+00 S8 6.61E-06 -3.29E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0127] Table 7-2

[0128] Table 8 shows some basic parameters of the optical imaging lens 2001 of Embodiment 3. Among them, f12 is the combined focal length of the first lens and the second lens, f23 is the combined focal length of the second lens and the third lens, and SAG11 is the axial distance between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens. The units of f12, f23, and SAG11 in Table 8 are millimeters (mm).

[0129] Parameter f12 f23 SAG11 Value 11.12 -10.57 0.95

[0130] Table 8

[0131] As Figure 5A shown, the optical imaging lens 2001 further includes at least 3 spacer elements, Figure 5A as shown in which are the first spacer element P1, the second spacer element P2, and the third spacer element P3. The first spacer element P1 is placed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is placed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is placed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens. Table 9 shows the basic parameter table of the spacer elements of the optical imaging lens 2001. The units of the parameters in Table 9 are all millimeters (mm). The above spacer elements can block external redundant light from entering, enable the lens and the lens barrel to bear against each other better, and enhance the structural stability of the optical imaging lens 2001.

[0132] Parameter d1s d1m D1s d2s d2m D2s D2m D3s D3m Value 3.435 3.435 5.742 2.385 2.385 4.822 4.822 4.662 4.662 Parameter d0s d0m EP01 EP12 EP23 CP1 CP3 L / Value 5.956 4.528 1.459 0.680 0.513 0.018 0.022 5.449 /

[0133] Table 9

[0134] Example 4

[0135] Figure 5B shows a schematic structural diagram of the optical imaging lens 2002 according to Embodiment 4 of the present application. In this embodiment, for the sake of simplicity, some descriptions similar to those in Embodiment 3 will be omitted.

[0136] As Figure 5B shown, the optical imaging lens 2002 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens 2002 is exactly the same as that of the optical imaging lens 2001 in Embodiment 3 and will not be elaborated here. The optical imaging lens 2002 further includes a filter (not shown) for correcting color deviation, and the filter has an object side surface S9 and an image side surface S10. The optical imaging lens 2002 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens. Light from the object sequentially passes through each surface S1 to S10 and finally forms an image on the imaging surface S11 (not shown). The basic parameters of the optical imaging lens 2002 are shown in detail in Tables 6 to 8.

[0137] As Figure 5B shown, the optical imaging lens 2002 further includes at least three spacer elements. Figure 5B The first spacer element P1, the second spacer element P2, and the third spacer element P3 are shown in [Figure]. The first spacer element P1 is disposed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens. Table 10 shows the basic parameter table of the spacer elements of the optical imaging lens 2002. The unit of each parameter in Table 10 is millimeter (mm). The above spacer elements can block external redundant light from entering, enable the lens and the lens barrel to better abut, and enhance the structural stability of the optical imaging lens 2002.

[0138] Parameter d1s d1m D1s d2s d2m D2s D2m D3s D3m Value 3.435 3.435 5.742 2.991 3.033 4.502 4.387 4.662 4.662 Parameter d0s d0m EP01 EP12 EP23 CP1 CP3 L / Value 5.956 4.528 1.459 0.680 1.305 0.018 0.022 5.449 /

[0139] Table 10

[0140] Figure 6A shows the axial chromatic aberration curves of the optical imaging lens 2001 of Example 3 and the optical imaging lens 2002 of Example 4, which represent the deviation of the focus points of light rays with different wavelengths after passing through the lens. Figure 6B shows the astigmatism curves of the optical imaging lens 2001 of Example 3 and the optical imaging lens 2002 of Example 4, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 6C shows the distortion curves of the optical imaging lens 2001 of Example 3 and the optical imaging lens 2002 of Example 4, which represent the distortion magnitude values corresponding to different image heights. Figure 6D shows the longitudinal chromatic aberration curves of the optical imaging lens 2001 of Example 3 and the optical imaging lens 2002 of Example 4, which represent the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 6A to 6D it can be known that the optical imaging lens 2001 of Example 3 and the optical imaging lens 2002 of Example 4 can achieve good imaging quality.

[0141] Example 5

[0142] Figure 7A shows a schematic structural diagram of an optical imaging lens 3001 according to Embodiment 5 of the present application. As Figure 7A shown, the optical imaging lens 3001 includes a lens barrel P0, a lens group, and a spacer element group.

[0143] As Figure 7AAs shown, the lens group of the optical imaging lens 3001 sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8.

[0144] The optical imaging lens 3001 further includes a filter (not shown) for correcting color deviation, and the filter has an object side surface S9 and an image side surface S10. The optical imaging lens 3001 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens. Light from an object sequentially passes through the surfaces S1 to S10 and finally forms an image on an imaging surface S11 (not shown).

[0145] Table 11 shows the basic parameter table of the lens group of the optical imaging lens 3001 in Embodiment 5, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm). Tables 12-1 and 12-2 show the higher-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 5, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0146]

[0147]

[0148] Table 11

[0149] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.55E-02 -1.47E-02 -4.15E-03 -9.62E-04 -2.02E-04 -3.09E-05 -4.27E-06 S2 -3.44E-02 -1.24E-02 -1.24E-04 -1.69E-04 3.20E-06 5.04E-06 -1.98E-06 S3 4.87E-02 -4.49E-03 2.97E-03 -5.14E-04 9.16E-05 -1.45E-05 -5.79E-06 S4 5.44E-02 2.12E-03 2.16E-03 8.11E-05 5.84E-05 1.26E-05 2.23E-06 S5 3.99E-02 -7.73E-04 1.32E-03 5.63E-05 3.19E-05 -2.02E-06 -2.80E-07 S6 2.99E-02 2.10E-03 1.65E-04 9.58E-04 -1.77E-04 1.21E-04 -3.69E-05 S7 -3.19E-01 3.80E-02 -7.34E-03 2.64E-03 -6.14E-04 2.52E-04 -7.71E-05 S8 -2.94E-01 3.63E-02 -5.42E-03 1.34E-03 -2.77E-04 -4.33E-05 -3.17E-05

[0150] Table 12-1

[0151] Face number A18 A20 A22 A24 A26 A28 A30 S1 8.77E-07 -7.63E-07 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S2 1.69E-07 -5.28E-07 3.71E-07 -4.33E-08 0.00E+00 0.00E+00 0.00E+00 S3 -2.30E-06 -1.03E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S4 2.22E-07 -2.93E-07 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S5 1.05E-06 -1.03E-06 2.02E-07 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S6 1.91E-05 -7.12E-06 1.90E-06 -1.85E-07 0.00E+00 0.00E+00 0.00E+00 S7 3.55E-05 -1.57E-05 4.93E-06 -1.22E-06 0.00E+00 0.00E+00 0.00E+00 S8 -3.64E-05 2.38E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0152] Table 12-2

[0153] Table 13 shows some basic parameters of the optical imaging lens 3001 in Embodiment 5, where f12 is the combined focal length of the first lens and the second lens, f23 is the combined focal length of the second lens and the third lens, and SAG11 is the axial distance between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens. The units of f12, f23, and SAG11 in Table 13 are millimeters (mm).

[0154] Parameter f12 f23 SAG11 Value 12.35 -24.75 0.81

[0155] Table 13

[0156] As Figure 7A shown, the optical imaging lens 3001 further includes at least 3 spacer elements. Figure 7AThe first spacer element P1, the second spacer element P2, and the third spacer element P3 are shown. The first spacer element P1 is placed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is placed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is placed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens. Table 14 shows the basic parameter table of the spacer elements of the optical imaging lens 3001. The unit of each parameter in Table 14 is millimeter (mm). The above spacer elements can block the excess external light from entering, enable the lens and the lens barrel to lean against each other better, and enhance the structural stability of the optical imaging lens 3001.

[0157] Parameter d1s d1m D1s d2s d2m D2s D2m D3s D3m Value 3.596 3.596 5.903 3.152 3.218 4.537 4.182 4.825 4.825 Parameter d0s d0m EP01 EP12 EP23 CP1 CP3 L / Value 6.117 4.046 1.459 0.568 0.671 0.018 0.022 5.797 /

[0158] Table 14

[0159] Example 6

[0160] Figure 7B The structural schematic diagram of the optical imaging lens 3002 according to Embodiment 6 of the present application is shown. In this embodiment, for the sake of simplicity, some descriptions similar to those in Embodiment 5 will be omitted.

[0161] As Figure 7B shown, the optical imaging lens 3002 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens 3002 is exactly the same as that of the optical imaging lens 3001 in Embodiment 5 and will not be elaborated here. The optical imaging lens 3002 further includes a filter (not shown) for correcting color deviation, and the filter has an object side surface S9 and an image side surface S10. The optical imaging lens 3002 further includes a stop STO (not shown) disposed between the first lens and the second lens. The light from the object sequentially passes through the surfaces S1 to S10 and finally forms an image on the imaging surface S11 (not shown). The basic parameters of the optical imaging lens 3002 are shown in detail in Tables 11 to 13.

[0162] As Figure 7B shown, the optical imaging lens 3002 further includes at least 3 spacer elements Figure 7BThe first spacer element P1, the second spacer element P2, and the third spacer element P3 are shown. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens. Table 15 shows the basic parameter table of the spacer elements of the optical imaging lens 3002, and the unit of each parameter in Table 15 is millimeter (mm). The above spacer elements can block excess external light from entering, enable the lens and the lens barrel to bear against each other better, and enhance the structural stability of the optical imaging lens 3002.

[0163] Parameter d1s d1m D1s d2s d2m D2s D2m D3s D3m Value 4.135 3.353 5.372 2.615 2.615 4.983 4.983 4.825 4.825 Parameter d0s d0m EP01 EP12 EP23 CP1 CP3 L / Value 6.117 4.046 1.459 0.568 0.671 0.685 0.022 5.797 /

[0164] Table 15

[0165] Figure 8A Shows the axial chromatic aberration curves of the optical imaging lens 3001 of Example 5 and the optical imaging lens 3002 of Example 6, which represent the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 8B Shows the astigmatism curves of the optical imaging lens 3001 of Example 5 and the optical imaging lens 3002 of Example 6, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 8C Shows the distortion curves of the optical imaging lens 3001 of Example 5 and the optical imaging lens 3002 of Example 6, which represent the distortion magnitude values corresponding to different image heights. Figure 8D Shows the longitudinal chromatic aberration curves of the optical imaging lens 3001 of Example 5 and the optical imaging lens 3002 of Example 6, which represent the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 8A to 8D It can be seen that the optical imaging lens 3001 of Example 5 and the optical imaging lens 3002 of Example 6 can achieve good imaging quality.

[0166] Example 7

[0167] Figure 9A Shows a schematic structural diagram of an optical imaging lens 4001 according to Embodiment 7 of the present application. As Figure 9A shown, the optical imaging lens 4001 includes a lens barrel P0, a lens group, and a spacer element group.

[0168] As Figure 9AAs shown, the lens group of the optical imaging lens 4001 sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8.

[0169] The optical imaging lens 4001 further includes a filter (not shown) for correcting color deviation, and the filter has an object side surface S9 and an image side surface S10. The optical imaging lens 4001 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens. Light from an object sequentially passes through the surfaces S1 to S10 and finally forms an image on an imaging surface S11 (not shown).

[0170] Table 16 shows the basic parameter table of the lens group of the optical imaging lens 4001 of Embodiment 7, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm). Tables 17-1 and 17-2 show the high-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 7, where each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.

[0171]

[0172] Table 16

[0173] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.63E-02 -1.66E-02 -5.82E-03 -1.62E-03 -4.20E-04 -7.87E-05 -1.67E-05 S2 -2.68E-02 -1.56E-02 -9.65E-04 -2.63E-05 -2.57E-05 1.49E-05 -6.92E-06 S3 5.86E-02 -1.31E-02 1.24E-03 -2.60E-04 -4.90E-05 -1.22E-05 -8.59E-06 S4 7.25E-02 -9.26E-04 1.72E-03 2.72E-04 5.63E-05 3.11E-05 1.16E-06 S5 5.30E-02 4.58E-03 1.47E-03 8.93E-05 1.38E-04 1.13E-05 2.08E-05 S6 3.23E-02 1.23E-02 -5.97E-04 1.14E-03 3.28E-04 3.21E-04 7.32E-05 S7 -3.66E-01 3.25E-02 -1.06E-02 1.45E-03 -9.78E-05 3.36E-04 5.43E-05 S8 -3.74E-01 3.30E-02 -1.08E-02 1.89E-03 -4.54E-04 1.13E-04 -4.34E-05

[0174] Table 17-1

[0175] Face number A18 A20 A22 A24 A26 A28 A30 S1 -6.70E-08 -2.61E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S2 2.31E-06 -3.64E-06 1.79E-06 -1.30E-07 0.00E+00 0.00E+00 0.00E+00 S3 5.50E-06 -5.15E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S4 9.59E-06 -4.60E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S5 1.29E-06 -4.43E-06 -3.29E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S6 8.33E-05 -1.34E-05 3.61E-06 -1.46E-05 0.00E+00 0.00E+00 0.00E+00 S7 1.04E-04 -9.08E-06 1.67E-05 -3.78E-06 0.00E+00 0.00E+00 0.00E+00 S8 2.89E-06 -2.08E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0176] Table 17-2

[0177] Table 18 shows some basic parameters of the optical imaging lens 4001 of Embodiment 7, where f12 is the combined focal length of the first lens and the second lens, f23 is the combined focal length of the second lens and the third lens, and SAG11 is the axial distance between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens. The units of f12, f23, and SAG11 in Table 18 are millimeters (mm).

[0178] Parameter f12 f23 SAG11 Value 10.43 -21.63 0.87

[0179] Table 18

[0180] As Figure 9A shown, the optical imaging lens 4001 further includes at least 3 spacer elements, Figure 9AThe first spacer element P1, the second spacer element P2, and the third spacer element P3 are shown. The first spacer element P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer element P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer element P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens. Table 19 shows the basic parameter table of the spacer elements of the optical imaging lens 4001, and the unit of each parameter in Table 19 is millimeter (mm). The above spacer elements can block the entry of excessive external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging lens 4001.

[0181] Parameter d1s d1m D1s d2s d2m D2s D2m D3s D3m Value 3.569 3.569 5.876 2.487 2.487 4.956 4.956 4.796 4.796 Parameter d0s d0m EP01 EP12 EP23 CP1 CP3 L / Value 6.090 4.591 1.459 0.539 0.421 0.018 0.022 5.423 /

[0182] Table 19

[0183] Example 8

[0184] Figure 9B The structural schematic diagram of the optical imaging lens 4002 according to Embodiment 8 of the present application is shown. In this embodiment, for the sake of simplicity, some descriptions similar to those in Embodiment 7 will be omitted.

[0185] As Figure 9B shown, the optical imaging lens 4002 includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens 4002 is exactly the same as the lens group of the optical imaging lens 4001 in Embodiment 7 and will not be described in detail. The optical imaging lens 4002 further includes a filter (not shown) for correcting color deviation, and the filter has an object side surface S9 and an image side surface S10. The optical imaging lens 4002 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens. The light from the object sequentially passes through the surfaces S1 to S10 and finally forms an image on the imaging surface S11 (not shown). The basic parameters of the optical imaging lens 4002 are shown in detail in Tables 16 to 18.

[0186] As Figure 9B shown, the optical imaging lens 4002 further includes at least 3 spacer elements, Figure 9BThe first spacer element P1, the second spacer element P2, and the third spacer element P3 are shown. The first spacer element P1 is placed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is placed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is placed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens. Table 20 shows the basic parameter table of the spacer elements of the optical imaging lens 4002, and the unit of each parameter in Table 20 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging lens 4002.

[0187] Parameter d1s d1m D1s d2s d2m D2s D2m D3s D3m Value 3.569 3.569 5.876 2.487 2.487 4.956 4.956 4.796 4.796 Parameter d0s d0m EP01 EP12 EP23 CP1 CP3 L / Value 6.090 4.591 1.459 0.598 0.421 0.018 0.022 5.423 /

[0188] Table 20

[0189] Figure 10A The axial chromatic aberration curves of the optical imaging lens 4001 of Example 7 and the optical imaging lens 4002 of Example 8 are shown, which represent the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 10B The astigmatism curves of the optical imaging lens 4001 of Example 7 and the optical imaging lens 4002 of Example 8 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 10C The distortion curves of the optical imaging lens 4001 of Example 7 and the optical imaging lens 4002 of Example 8 are shown, which represent the distortion magnitude values corresponding to different image heights. Figure 10D The longitudinal chromatic aberration curves of the optical imaging lens 4001 of Example 7 and the optical imaging lens 4002 of Example 8 are shown, which represent the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 10A to 10D it can be known that the optical imaging lens 4001 of Example 7 and the optical imaging lens 4002 of Example 8 can achieve good imaging quality.

[0190] In summary, the optical imaging lenses of Examples 1 to 8 satisfy the relationships shown in Table 21.

[0191] Conditional / Example 1 2 3 4 5 6 7 8 f1×N1 / EP01 5.13 5.13 5.12 5.12 5.52 5.52 5.20 5.20 (CT1 + CP1) / T12 2.29 2.29 2.35 2.35 2.76 4.03 2.83 2.83 (EP01 + EP12) / CT2 7.02 7.23 5.31 5.31 7.24 7.24 7.14 7.35 T23 / EP12 2.88 2.59 2.28 2.28 2.73 2.73 2.87 2.59 d0s / d0m 1.32 1.32 1.32 1.32 1.51 1.51 1.33 1.33 f3×N3 / (CT3 + CP3) 25.08 25.08 42.03 42.03 22.18 22.18 35.01 35.01 (T12 + T23 + T34) / L 0.43 0.43 0.42 0.42 0.38 0.38 0.41 0.41 R1×SAG11 / D1s 0.40 0.40 0.41 0.41 0.36 0.40 0.36 0.36 R2 / d1s 13.48 13.48 12.29 12.29 8.34 7.26 6.52 6.52 R2 / R1 18.63 18.63 16.80 16.80 11.35 11.35 9.48 9.48 f23 / (D2s+D3s) -1.90 -1.90 -1.11 -1.15 -2.64 -2.52 -2.22 -2.22 f12 / (d1m+d2s) 1.78 1.78 1.91 1.73 1.83 2.07 1.72 1.72 (R3×R4) / (D2m×d2m) 3.18 3.18 2.22 1.92 2.99 3.08 2.81 2.81 f2×N2 / EP23 -13.84 -13.84 -16.74 -6.58 -15.03 -15.03 -23.76 -23.76 f4 / D3m -3.40 -3.40 -7.86 -7.86 -2.31 -2.31 -2.25 -2.25

[0192] Table 21

[0193] The present application also provides an imaging device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). 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 optical imaging lens described above.

[0194] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. An optical imaging lens, characterized in that: include: A lens barrel and a lens group and a spacer element group placed in the lens barrel, wherein: The lens group includes, in order from the object side to the image side along the optical axis: a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, and a fourth lens with negative focal power; The spacer element group includes: a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens; The number of lenses having optical power in the optical imaging lens is four; The curvature radius R2 of the image side surface of the first lens and the inner diameter d1s of the object side surface of the first spacer element satisfy: 6.5<R2 / d1s<13.5; The effective focal length f1 of the first lens, the refractive index N1 of the first lens, and the distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element along the optical axis direction satisfy: 5.1<f1×N1 / EP01<5.

53.

2. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies: 2.28<(CT1+CP1) / T12<4.04, wherein CT1 is the center thickness of the first lens on the optical axis, CP1 is the maximum thickness of the first spacing element along the optical axis, and T12 is the air spacing between the first lens and the second lens on the optical axis.

3. The optical imaging lens according to claim 1, wherein: The spacer element group further includes: a second spacer element disposed on the image side of the second lens and in at least partial contact with the image side surface of the second lens; The optical imaging lens satisfies: 5.3<(EP01+EP12) / CT2<7.4, wherein EP01 is the distance from the object side end face of the lens barrel to the object side face of the first spacing element along the optical axis, EP12 is the distance from the image side face of the first spacing element to the object side face of the second spacing element along the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

4. The optical imaging lens according to claim 1, wherein: The spacer element group further includes: a second spacer element disposed on the image side of the second lens and in at least partial contact with the image side surface of the second lens; The optical imaging lens satisfies: 2.27<T23 / EP12<2.9, wherein T23 is the air spacing between the second lens and the third lens on the optical axis, and EP12 is the distance from the image side surface of the first spacing element to the object side surface of the second spacing element along the optical axis.

5. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies: 1.3<d0s / d0m<1.52, wherein d0s is the inner diameter of the object side end surface of the lens barrel, and d0m is the inner diameter of the image side end surface of the lens barrel.

6. The optical imaging lens according to claim 1, wherein: The spacer element group further includes: a third spacer element disposed on the image side of the third lens and in at least partial contact with the image side surface of the third lens; The optical imaging lens satisfies: 22.17<f3×N3 / (CT3+CP3)<42.04, wherein f3 is the effective focal length of the third lens, N3 is the refractive index of the third lens, CT3 is the center thickness of the third lens on the optical axis, and CP3 is the maximum thickness of the third spacer element along the optical axis.

7. The optical imaging lens according to any one of claims 1 to 6, characterized in that: The optical imaging lens satisfies: 0.37<(T12+T23+T34) / L<0.44, wherein T12 is the air interval between the first lens and the second lens on the optical axis, T23 is the air interval between the second lens and the third lens on the optical axis, T34 is the air interval between the third lens and the fourth lens on the optical axis, and L is the maximum height of the lens barrel along the optical axis.

8. The optical imaging lens according to any one of claims 1 to 6, characterized in that: The optical imaging lens satisfies: 0.35<R1×SAG11 / D1s<0.42, wherein R1 is the curvature radius of the object side surface of the first lens, SAG11 is the axial distance between the intersection of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens, and D1s is the outer diameter of the object side surface of the first spacer element.

9. The optical imaging lens according to any one of claims 1 to 6, characterized in that: The optical imaging lens satisfies: 9.47<R2 / R1<18.64, wherein R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the image side surface of the first lens.

10. The optical imaging lens according to claim 1, wherein: The spacer element group further includes: a second spacer element and a third spacer element, wherein the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens, and the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; The optical imaging lens satisfies: -2.65<f23 / (D2s+D3s)<-1.1, wherein f23 is the combined focal length of the second lens and the third lens, D2s is the outer diameter of the object side surface of the second spacing element, and D3s is the outer diameter of the object side surface of the third spacing element.

11. The optical imaging lens according to claim 1, wherein: The spacer element group further includes: a second spacer element disposed on the image side of the second lens and in at least partial contact with the image side surface of the second lens; The optical imaging lens satisfies: 1.7<f12 / (d1m+d2s)<2.1, wherein f12 is the combined focal length of the first lens and the second lens, d1m is the inner diameter of the image side surface of the first spacing element, and d2s is the inner diameter of the object side surface of the second spacing element.

12. The optical imaging lens according to claim 1, wherein: The spacer element group further includes: a second spacer element disposed on the image side of the second lens and in at least partial contact with the image side surface of the second lens; The optical imaging lens satisfies: 1.9<(R3×R4) / (D2m×d2m)<3.2, wherein R3 is the radius of curvature of the object side surface of the second lens, R4 is the radius of curvature of the image side surface of the second lens, D2m is the outer diameter of the image side surface of the second spacing element, and d2m is the inner diameter of the image side surface of the second spacing element.

13. The optical imaging lens according to claim 1, wherein: The spacer element group further includes: a second spacer element and a third spacer element, wherein the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens, and the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; The optical imaging lens satisfies: -23.8<f2×N2 / EP23<-6.57, wherein f2 is the effective focal length of the second lens, N2 is the refractive index of the second lens, and EP23 is the distance from the image side surface of the second spacing element to the object side surface of the third spacing element along the optical axis.

14. The optical imaging lens according to any one of claims 1 to 5, characterized in that: The spacer element group further includes: a third spacer element disposed on the image side of the third lens and in at least partial contact with the image side surface of the third lens; The optical imaging lens satisfies: -7.9<f4 / D3m<-2.24, wherein f4 is the effective focal length of the fourth lens, and D3m is the outer diameter of the image side surface of the third spacing element.

15. The optical imaging lens according to claim 1, wherein: The object side surface of the first lens is convex, and the image side surface is concave; The object side surface of the second lens is convex, and the image side surface is concave; The image side surface of the third lens is a convex surface.

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