Optical imaging lens

Abstract

The application provides an optical imaging lens, which comprises five lenses, the last lens is a fifth lens, the diameter of the fifth lens is larger than that of the other four lenses; at least one spacer, the spacer is in contact with the lens, wherein the spacer between the first lens and the second lens and directly in contact with the image side of the first lens is a first spacer, the spacer between the second lens and the third lens and directly in contact with the image side of the second lens is a second spacer, the radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens and the interval EP12 between the first spacer and the second spacer satisfy the following relationship: 6.5<(R3-R4) / EP12<11.0; a lens barrel, the lens and the spacer are all contained in the lens barrel, and the lens is in contact with the inner wall surface of the lens barrel. The application solves the problem of low yield of the optical imaging lens in the prior art.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to an optical imaging lens. Background Technology

[0002] In recent years, as the mobile phone industry has continued to develop towards miniaturization, high pixel count, and multi-functionality, the functions of optical imaging lenses in mobile phones have become increasingly complex to meet the ever-growing needs of users. This has led to increasingly stringent constraints on mobile phones, resulting in significant problems with optical imaging lenses. The increased number of lenses used in optical imaging lenses makes image quality difficult to control. Furthermore, the weight and surface shape of each lens, in order to meet the functional requirements of the optical imaging lens, pose considerable challenges to manufacturing and assembly, significantly reducing the yield rate. Additionally, spacers are typically introduced to stabilize the lenses and ensure assembly stability. However, the introduction of spacers introduces more stray light, greatly reducing image quality and placing an additional burden on the optical imaging lens in eliminating stray light, making the fit between the lens, spacers, and lens barrel more difficult. Moreover, due to the limitations of the lens barrel, especially for small-head optical imaging lenses, the mechanical components are constrained by the lens barrel structure, causing most of the important dimensions of the optical imaging lens to be at their limits, resulting in severe stray light. How to improve these problems has become one of the key issues for the industry's development.

[0003] In other words, existing optical imaging lenses suffer from low yield rates. Summary of the Invention

[0004] The main objective of this invention is to provide an optical imaging lens to solve the problem of low yield in existing optical imaging lenses.

[0005] To achieve the above objectives, according to one aspect of the present invention, an optical imaging lens is provided, comprising: five lenses, the last lens being a fifth lens, the diameter of the fifth lens being larger than the diameters of the other four lenses; at least one spacer in contact with the lenses, wherein the spacer located between the first lens and the second lens and in direct contact with the image-side surface of the first lens is a first spacer, and the spacer located between the second lens and the third lens and in direct contact with the image-side surface of the second lens is a second spacer, wherein the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, and the spacing EP12 between the first spacer and the second spacer satisfy: 6.5 < (R3 - R4) / EP12 < 11.0; a lens barrel, wherein the lenses and the spacers are all housed within the lens barrel, and the lenses are all in contact with the inner wall surface of the lens barrel.

[0006] Furthermore, the optical imaging lens also includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and is in direct contact with the image side of the fourth lens. The inner surface of the fourth spacer is stepped.

[0007] Furthermore, the center thickness CT1 of the first lens on the optical axis of the optical imaging lens, the effective focal length f1 of the first lens, and the maximum thickness CP1 of the first spacer satisfy the following condition: 13.0 < f1 / (CP1+CT1) < 20.0.

[0008] Furthermore, the outer diameter D1m of the image side of the first spacer, the outer diameter D1s of the object side of the first spacer, the radius of curvature R1 of the object side of the first lens, and the radius of curvature R2 of the image side of the first lens satisfy the following condition: 2.0 < (D1m + D1s) / (R2 - R1) < 3.5.

[0009] Furthermore, the following conditions must be met between the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, the maximum thickness CP2 of the second spacer, the inner diameter d2s of the object side of the second spacer, and the outer diameter D2s of the object side of the second spacer: 4.0 < (D2s - d2s) / (CT2 - CP2) < 7.5.

[0010] Furthermore, the outer diameter D2m of the image side of the second spacer, the outer diameter D2s of the object side of the second spacer, and the effective focal length f2 of the second lens satisfy the following condition: 1.0 < |f2 / (D2s+D2m)| < 2.0.

[0011] Furthermore, the following conditions must be met: the center thickness CT1 of the first lens on the optical axis of the optical imaging lens, the inner diameter d1s of the object side of the first spacer, the inner diameter d1m of the image side of the first spacer, and the distance EP01 between the object side of the front end face of the lens barrel and the first spacer: 2.0 < (EP01 - CT1) / (d1s - d1m) < 6.5.

[0012] Furthermore, the optical imaging lens also includes a third spacer, which is disposed between the third lens and the fourth lens and directly contacts the image side of the third lens. The spacing EP23 between the second spacer and the third spacer, the center thickness CT3 of the third lens on the optical axis of the optical imaging lens, and the effective focal length f3 of the third lens satisfy the following condition: 5.0 < f3 / (EP23+CT3) < 8.0.

[0013] Furthermore, the optical imaging lens also includes a third spacer, which is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The radius of curvature R5 of the object side of the third lens, the inner diameter d3s of the object side of the third spacer, and the inner diameter d3m of the image side of the third spacer satisfy the following: 1.0 < R5 / (d3s+d3m) < 3.0.

[0014] Furthermore, the optical imaging lens also includes a third spacer, which is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The outer diameter D3m of the image side of the third spacer, the outer diameter D3s of the object side of the third spacer, and the radius of curvature R6 of the image side of the third lens satisfy the following condition: -2.5 < (D3s + D3m) / R6 < -1.0.

[0015] Furthermore, the optical imaging lens also includes a third spacer and a fourth spacer. The third spacer is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The fourth spacer is disposed between the fourth lens and the fifth lens and is in direct contact with the image side of the fourth lens. The maximum thickness CP3 of the third spacer, the maximum thickness CP4 of the fourth spacer, and the effective focal length f5 of the fifth lens satisfy the following condition: -4.5 < f5 / (CP3+CP4) < -2.5.

[0016] Furthermore, the optical imaging lens also includes a third spacer and a fourth spacer. The third spacer is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The fourth spacer is disposed between the fourth lens and the fifth lens and is in direct contact with the image side of the fourth lens. The radius of curvature R7 of the object side of the fourth lens, the distance EP34 between the third spacer and the fourth spacer, and the center thickness CT4 of the fourth lens on the optical axis of the optical imaging lens satisfy the following condition: -5.0 < R7 / (CT4+EP34) < -3.5.

[0017] Furthermore, the optical imaging lens also includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and is in direct contact with the image side of the fourth lens. The radius of curvature R10 of the image side of the fifth lens, the outer diameter D4s of the object side of the fourth spacer, and the inner diameter d4s of the object side of the fourth spacer satisfy the following: 2.0 < R10 / (D4s-d4s) < 3.0.

[0018] Furthermore, the optical imaging lens also includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens. The maximum thickness CP4 of the fourth spacer, the radius of curvature R9 of the object side of the fifth lens, the radius of curvature R8 of the image side of the fourth lens, and the air gap T45 between the fourth lens and the fifth lens on the optical axis of the optical imaging lens satisfy the following: 3.5 < (R8 + R9) / (CP4 + T45) < 5.0.

[0019] According to another aspect of the present invention, an optical imaging lens is provided, comprising: five lenses, the last lens being a fifth lens, the diameter of the fifth lens being larger than the diameter of the other four lenses; at least one spacer in contact with the lenses, wherein the spacer located between the first lens and the second lens and in direct contact with the image side of the first lens is the first spacer, and the center thickness CT1 of the first lens on the optical axis, the effective focal length f1 of the first lens, and the maximum thickness CP1 of the first spacer satisfy the following: 13.0 < f1 / (CP1+CT1) < 20.0; a lens barrel, in which the lenses and the spacer are all housed, and the lenses are all in contact with the inner wall surface of the lens barrel.

[0020] Furthermore, the optical imaging lens also includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and is in direct contact with the image side of the fourth lens. The inner surface of the fourth spacer is stepped.

[0021] Furthermore, the outer diameter D1m of the image side of the first spacer, the outer diameter D1s of the object side of the first spacer, the radius of curvature R1 of the object side of the first lens, and the radius of curvature R2 of the image side of the first lens satisfy the following condition: 2.0 < (D1m + D1s) / (R2 - R1) < 3.5.

[0022] Furthermore, the optical imaging lens also includes a second spacer, which is disposed between the second lens and the third lens and directly contacts the image side of the second lens. The center thickness CT2 of the second lens on the optical axis of the optical imaging lens, the maximum thickness CP2 of the second spacer, the inner diameter d2s of the object side of the second spacer, and the outer diameter D2s of the object side of the second spacer satisfy the following: 4.0 < (D2s-d2s) / (CT2-CP2) < 7.5.

[0023] Furthermore, the optical imaging lens also includes a second spacer, which is disposed between the second lens and the third lens and is in direct contact with the image side of the second lens. The outer diameter D2m of the image side of the second spacer, the outer diameter D2s of the object side of the second spacer, and the effective focal length f2 of the second lens satisfy the following condition: 1.0 < |f2 / (D2s+D2m)| < 2.0.

[0024] Furthermore, the following conditions must be met: the center thickness CT1 of the first lens on the optical axis of the optical imaging lens, the inner diameter d1s of the object side of the first spacer, the inner diameter d1m of the image side of the first spacer, and the distance EP01 between the object side of the front end face of the lens barrel and the first spacer: 2.0 < (EP01 - CT1) / (d1s - d1m) < 6.5.

[0025] Furthermore, the optical imaging lens also includes a second spacer and a third spacer. The second spacer is disposed between the second lens and the third lens and is in direct contact with the image side of the second lens. The third spacer is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The spacing EP23 between the second spacer and the third spacer, the center thickness CT3 of the third lens on the optical axis of the optical imaging lens, and the effective focal length f3 of the third lens satisfy the following condition: 5.0 < f3 / (EP23+CT3) < 8.0.

[0026] Furthermore, the optical imaging lens also includes a third spacer, which is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The radius of curvature R5 of the object side of the third lens, the inner diameter d3s of the object side of the third spacer, and the inner diameter d3m of the image side of the third spacer satisfy the following: 1.0 < R5 / (d3s+d3m) < 3.0.

[0027] Furthermore, the optical imaging lens also includes a third spacer, which is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The outer diameter D3m of the image side of the third spacer, the outer diameter D3s of the object side of the third spacer, and the radius of curvature R6 of the image side of the third lens satisfy the following condition: -2.5 < (D3s + D3m) / R6 < -1.0.

[0028] Furthermore, the optical imaging lens also includes a third spacer and a fourth spacer. The third spacer is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The fourth spacer is disposed between the fourth lens and the fifth lens and is in direct contact with the image side of the fourth lens. The maximum thickness CP3 of the third spacer, the maximum thickness CP4 of the fourth spacer, and the effective focal length f5 of the fifth lens satisfy the following condition: -4.5 < f5 / (CP3+CP4) < -2.5.

[0029] Furthermore, the optical imaging lens also includes a third spacer and a fourth spacer. The third spacer is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The fourth spacer is disposed between the fourth lens and the fifth lens and is in direct contact with the image side of the fourth lens. The radius of curvature R7 of the object side of the fourth lens, the distance EP34 between the third spacer and the fourth spacer, and the center thickness CT4 of the fourth lens on the optical axis of the optical imaging lens satisfy the following condition: -5.0 < R7 / (CT4+EP34) < -3.5.

[0030] Furthermore, the optical imaging lens also includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and in direct contact with the image-side surface of the fourth lens. The radius of curvature R10 of the image-side surface of the fifth lens and the radius of curvature R10 of the object-side surface of the fourth spacer are...

[0031] Furthermore, the optical imaging lens also includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens. The maximum thickness CP4 of the fourth spacer, the radius of curvature R9 of the object side of the fifth lens, the radius of curvature R8 of the image side of the fourth lens, and the air gap T45 between the fourth lens and the fifth lens on the optical axis of the optical imaging lens satisfy the following: 3.5 < (R8 + R9) / (CP4 + T45) < 5.0.

[0032] Furthermore, the first lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; the second lens has negative optical power, its object-side surface is convex, and its image-side surface is concave; the third lens has positive optical power, its object-side surface is convex, and its image-side surface is convex; the fourth lens has positive optical power, its object-side surface is concave, and its image-side surface is convex; and the fifth lens has negative optical power, its object-side surface is convex, and its image-side surface is concave.

[0033] According to the technical solution of this invention, the optical imaging lens includes a lens barrel, five lenses, and at least one spacer. The last lens is the fifth lens, and the diameter of the fifth lens is larger than the diameter of the other four lenses. The spacer contacts the lenses. The spacer located between the first lens and the second lens and in direct contact with the image side of the first lens is the first spacer, and the spacer located between the second lens and the third lens and in direct contact with the image side of the second lens is the second spacer. The radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens, and the distance EP12 between the first spacer and the second spacer satisfy: 6.5 < (R3-R4) / EP12 < 11.0. The lenses and spacers are both housed in the lens barrel, and the lenses are all in contact with the inner wall surface of the lens barrel.

[0034] By placing at least one spacer between two adjacent lenses, the reflection of light between them can be reduced, which helps to reduce stray light generation and ensure the imaging quality of the optical imaging lens. Simultaneously, assembling at least one spacer between two adjacent lenses allows for adjustment of the distance between them, ensuring the imaging quality of the optical imaging lens. Furthermore, the spacer ensures stable lens support, guaranteeing the stability of the lens assembly and effectively increasing the stability of the optical imaging lens assembly. Due to the limitations of the lens barrel structure, especially for small-head optical imaging lenses, the outer diameter of the mechanism cannot be too large due to the constraints of the lens barrel structure. Therefore, most important dimensions of small-head optical imaging lenses are at their limits, and stray light is relatively severe. Setting the diameter of the fifth lens to the maximum allows as much light as possible to be transmitted to the imaging surface, improving the illumination of the optical imaging lens. Additionally, the large difference between the fifth lens and the front lens necessitates the addition of a spacer to ensure assembly stability. The introduction of the spacer also intercepts stray light reflected from the spacer itself and the imaging surface. By controlling (R3-R4) / EP12 within a reasonable range, the edge thickness of the mechanism can be kept within a reasonable range, ensuring the stability of the molding process. In addition, it helps to control the dimensions of the first and second spacers, preventing the first and second lenses from coming into contact and breaking during reliability tests, thus avoiding abnormal phenomena and improving the yield of optical imaging lenses. Attached Figure Description

[0035] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0036] Figure 1 A schematic diagram of the structure of an optical imaging lens according to an optional embodiment of the present invention is shown;

[0037] Figure 2 This diagram illustrates the stray light path of an optical imaging lens according to an optional embodiment of the present invention.

[0038] Figure 3 A schematic diagram of the structure of the optical imaging lens of Example 1 of the present invention in a first state is shown.

[0039] Figure 4 A schematic diagram of the structure of the optical imaging lens of Example 1 of the present invention in a second state is shown.

[0040] Figures 5 to 8 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 1 of the present invention are shown respectively.

[0041] Figure 9A schematic diagram of the structure of the optical imaging lens of Example 2 of the present invention in a first state is shown;

[0042] Figure 10 A schematic diagram of the structure of the optical imaging lens of Example 2 of the present invention in a second state is shown;

[0043] Figures 11 to 14 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 2 of the present invention are shown respectively.

[0044] Figure 15 A schematic diagram of the structure of the optical imaging lens of Example 3 of the present invention in a first state is shown;

[0045] Figure 16 A schematic diagram of the structure of the optical imaging lens of Example 3 of the present invention in the second state is shown;

[0046] Figures 17 to 20 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 3 of the present invention are shown respectively.

[0047] Figure 21 A schematic diagram of the structure of the optical imaging lens of Example 4 of the present invention in a first state is shown;

[0048] Figure 22 A schematic diagram of the structure of the optical imaging lens of Example 4 of the present invention in a second state is shown;

[0049] Figures 23 to 26 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 4 of the present invention are shown respectively.

[0050] The above figures include the following reference numerals:

[0051] 10. Lens tube; E1, First lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; P1, First spacer; E2, Second lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; P2, Second spacer; E3, Third lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; P3, Third spacer; P3b, Third auxiliary spacer; E4, Fourth lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens; P4, Fourth spacer; P4b, Fourth auxiliary spacer; E5, Fifth lens; S9, Object-side surface of the fifth lens; S10, Image-side surface of the fifth lens. Detailed Implementation

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0053] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0054] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0055] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0056] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0057] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens data in optical software) to determine convexity or concavity. For the object side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0058] To address the low yield rate of existing optical imaging lenses, this invention provides an optical imaging lens. Specifically, this invention provides a 5P small-head optical imaging lens. By controlling the relationships between the effective focal length, lens thickness, lens radius of curvature, and inter-lens gaps, the thickness of the spacers between lenses, the inner and outer diameters of the spacers, and the relevant dimensions of the lens barrel, the problems of stray light, out-of-tolerance optical parameters, and poor product reliability in optical imaging lenses can be effectively solved. Example

[0059] like Figures 1 to 26 As shown, the optical imaging lens includes a lens barrel 10, five lenses, and at least one spacer. The last lens is the fifth lens, and the diameter of the fifth lens is larger than the diameter of the other four lenses. The spacers are in contact with the lenses. The spacer located between the first and second lenses and in direct contact with the image side of the first lens is the first spacer, and the spacer located between the second and third lenses and in direct contact with the image side of the second lens is the second spacer. The radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens, and the distance EP12 between the first and second spacers satisfy the following: 6.5 < (R3-R4) / EP12 < 11.0. The lenses and spacers are both housed within the lens barrel 10, and the lenses are all in contact with the inner wall surface of the lens barrel 10.

[0060] By placing at least one spacer between two adjacent lenses, the reflection of light between them can be reduced, which helps to reduce stray light generation and ensure the imaging quality of the optical imaging lens. Simultaneously, assembling at least one spacer between two adjacent lenses allows for adjustment of the distance between them, ensuring the imaging quality of the optical imaging lens. Furthermore, the spacer ensures stable lens support, guaranteeing the stability of the lens assembly and effectively increasing the stability of the optical imaging lens assembly. Due to the limitations of the lens barrel structure, especially for small-head optical imaging lenses, the outer diameter of the mechanism cannot be too large due to the limitations of the lens barrel structure. Therefore, most important dimensions of small-head optical imaging lenses are at their limits, and stray light is relatively severe. Setting the diameter of the fifth lens to the maximum allows as much light as possible to be transmitted to the imaging surface, improving the illumination of the optical imaging lens. Additionally, the large difference between the fifth lens and the front lens necessitates the addition of a spacer to ensure assembly stability. The introduction of the spacer also intercepts stray light reflected from the spacer itself and the imaging surface. Assembling the lenses and spacers within the lens barrel 10 ensures the fixed position of each lens, preventing misalignment or tilting and guaranteeing the stability of the optical imaging lens. Simultaneously, the lens barrel 10 protects the lens assembly, preventing collisions with other structural components and further ensuring the stability of the optical imaging lens. Maintaining (R3-R4) / EP12 within a reasonable range keeps the edge thickness of the mechanism within a suitable range, ensuring molding stability. Furthermore, it helps control the dimensions of the first and second spacers, preventing the first and second lenses from contacting each other and breaking during reliability testing, thus avoiding abnormal phenomena and improving the yield rate of the optical imaging lens.

[0061] Preferably, the radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens, and the interval EP12 between the first spacer and the second spacer satisfy the following: 6.84≤(R3-R4) / EP12≤10.98.

[0062] It should be noted that the spacer can intercept stray light paths, which helps to reduce stray light caused by reflection from the spacer. When stray light cannot be improved, an ink coating structure can be added to the spacer to improve stray light and provide a margin that meets the requirements.

[0063] It should be noted that spacers can be relatively thin light-blocking components or relatively thick spacers, serving a supporting and limiting function. Of course, the thickness of multiple spacers located between two lenses can be the same or different, depending on the specific requirements of the design. Similarly, the thickness of spacers located between different lenses can also be the same or different, depending on the specific design requirements.

[0064] The optical imaging lens provided in this application allows for different assembly methods for the lens, spacer elements, and lens barrel 10 depending on the product's operating environment. For example, a lens snap-fit ​​structure increases the stability of the offset, making it suitable for electronic devices with stringent shake parameters. Properly controlling the lens edge thickness can improve lens quality, and combining spacers of different thicknesses enhances the appearance of the optical imaging lens and avoids stray light, thus meeting market demands.

[0065] In this embodiment, the optical imaging lens also includes a fourth spacer. The fourth spacer is disposed between the fourth lens and the fifth lens and directly contacts the image side of the fourth lens. The inner surface of the fourth spacer is stepped. By adding a stepped microstructure to the inner diameter surface of the fourth spacer, the problem of light concentration can be effectively solved, reducing the risk of stray light from primary reflection when light directly hits the inner diameter surface of the fourth spacer. This weakens the stray light energy, resulting in less noticeable stray light in actual shooting. It eliminates the need for a stray light interceptor in front of the fourth spacer, thus reducing production costs. Furthermore, under the limit of the total weight of the optical imaging lens, adjusting the weight of the metal spacer is the most effective way to reduce weight. However, this results in a thinner wall thickness between the inner diameter slope of the spacer and the object side of the fourth spacer, making spacer molding difficult. Adding a stepped microstructure to the inner surface of the fourth spacer increases the wall thickness of the object side of the fourth spacer near the inner surface, ensuring that the strength meets requirements after molding, enhancing assembly stability, and improving the yield of the optical imaging lens.

[0066] In this embodiment, the center thickness CT1 of the first lens on the optical axis of the optical imaging lens, the effective focal length f1 of the first lens, and the maximum thickness CP1 of the first spacer satisfy the following condition: 13.0 < f1 / (CP1+CT1) < 20.0. By limiting f1 / (CP1+CT1) within a reasonable range, the thickness of the first lens can be prevented from exceeding the threshold. Simultaneously, limiting the effective focal length of the first lens effectively restricts light deflection, preventing excessive curvature in the optical and mechanical parts of the first and second lenses, which could lead to forming problems. This improves the assembly stability of the first and second lenses, limits the assembly deformation of the optical imaging lens, and ensures the strength of the optical imaging lens. Furthermore, the first and second lenses can share each other's edge thickness, ensuring the formability of both lenses and providing a margin for mitigating severe stray light problems later on, thus improving the yield of the optical imaging lens. Preferably, 13.45 ≤ f1 / (CP1+CT1) ≤ 19.47.

[0067] In this embodiment, the outer diameter D1m of the image side of the first spacer, the outer diameter D1s of the object side of the first spacer, the radius of curvature R1 of the object side of the first lens, and the radius of curvature R2 of the image side of the first lens satisfy the following condition: 2.0 < (D1m + D1s) / (R2 - R1) < 3.5. By controlling (D1m + D1s) / (R2 - R1) within a reasonable range and comprehensively considering the machinability of the mold, the uniformity of the contour shape of the first lens can be ensured, avoiding problems such as the first lens being too long and prone to breakage, or the edges being too thin and prone to chipping. Simultaneously, it avoids problems affecting the molding process of the first lens, such as surface shape, strength, and injection molding flowability, thus reducing the processing cost of the first lens. Furthermore, it avoids the first lens being too heavy, which would increase material costs, and prevents the first lens from having an excessively thick-to-thin ratio, which could lead to weld lines, facilitating the processing and molding of the first lens and mitigating the risk of weld lines in advance. Furthermore, by limiting the outer diameter of the image side and object side of the first spacer, difficulties in molding the first spacer can be avoided, ensuring the bearing stability of the first spacer. Preferably, 2.69≤(D1m+D1s) / (R2-R1)≤3.02.

[0068] In this embodiment, the central thickness CT2 of the second lens on the optical axis of the imaging lens, the maximum thickness CP2 of the second spacer, the inner diameter d2s of the object side of the second spacer, and the outer diameter D2s of the object side of the second spacer satisfy the following: 4.0 < (D2s - d2s) / (CT2 - CP2) < 7.5. By controlling (D2s - d2s) / (CT2 - CP2) within a reasonable range, the incident light rays from the second lens to the third lens can converge, allowing for a larger margin in the air gap between the second and third lenses on the optical axis. This is beneficial for improving the stability of the assembly of the second lens with its adjacent lenses. Furthermore, for a center-aperture lens, the second spacer is attached to the edge of the principal ray in the incident light rays, and controlling the thickness range of the second spacer can effectively block stray light without affecting the principal ray. Preferably, 4.42 ≤ (D2s - d2s) / (CT2 - CP2) ≤ 7.07.

[0069] In this embodiment, the outer diameter D2m of the image side of the second spacer, the outer diameter D2s of the object side of the second spacer, and the effective focal length f2 of the second lens satisfy the following condition: 1.0 < |f2 / (D2s+D2m)| < 2.0. By limiting |f2 / (D2s+D2m)| within a reasonable range, the contour of the image side of the second lens can be affected, which helps to improve the internal reflection stray light of the second and third lenses and improve the imaging quality of the optical imaging lens. In addition, by limiting the effective focal length of the second lens, the degree of deflection of light entering subsequent lenses can be limited, the shape of the lens can be improved, and the processing yield can be increased. Preferably, 1.41 ≤ |f2 / (D2s+D2m)| ≤ 1.71.

[0070] In this embodiment, the following parameters are satisfied: the center thickness CT1 of the first lens on the optical axis of the optical imaging lens; the inner diameter d1s of the object-side surface of the first spacer; the inner diameter d1m of the image-side surface of the first spacer; and the distance EP01 between the object-side surface of the front end face of the lens barrel and the first spacer: 2.0 < (EP01 - CT1) / (d1s - d1m) < 6.5. The structure between the first and fifth lenses forms a lens group. Assembling the lens group within the lens barrel 10 fixes the position of each lens, preventing lens misalignment or tilting, and ensuring the stability of the optical imaging lens during operation. Simultaneously, the lens barrel 10 protects the lens group, preventing collisions with the lenses from other structures, effectively ensuring the stability of the optical imaging lens during operation. By controlling (EP01-CT1) / (d1s-d1m) within a reasonable range, sufficient overall lens thickness can be maintained at the head of the lens barrel 10. This strengthens the bearing strength of the first lens's top surface. With the exit hole position fixed, the flared position can be freely adjusted to ensure sufficient overall lens thickness at the light-transmitting hole position. This helps to mitigate the feathering and other stray light caused by insufficient overall lens thickness during injection molding, resulting in a bright white exit hole. While ensuring the thickness-to-diameter ratio and diameter-to-thickness ratio of the first lens, maintaining the overall thickness and strength of the lens at the head of the lens barrel 10 prevents the light source from directly penetrating the lens barrel 10, avoiding unavoidable stray light. Furthermore, if the thickness-to-thickness ratio of the first lens exceeds a threshold, controlling (EP01-CT1) / (d1s-d1m) within a reasonable range reduces stray light caused by weld lines, improving the imaging quality of the optical imaging lens. Preferably, 2.49 ≤ (EP01-CT1) / (d1s-d1m) ≤ 6.30.

[0071] In this embodiment, the optical imaging lens further includes a third spacer, which is disposed between the third lens and the fourth lens and directly contacts the image-side surface of the third lens. The spacing EP23 between the second and third spacers, the center thickness CT3 of the third lens on the optical axis of the optical imaging lens, and the effective focal length f3 of the third lens satisfy the following condition: 5.0 < f3 / (EP23+CT3) < 8.0. By controlling f3 / (EP23+CT3) within a reasonable range, the shape of the third lens can be restricted, ensuring the rationality of the direction of incident light when passing through the third lens, effectively blocking stray light, and allowing the second lens to bear the corresponding third-order distortion aberration, enabling the optical imaging lens to reasonably control distortion and improve the imaging quality of the optical imaging lens. In addition, it can improve the structural uniformity of the second and third spacers and the overall structural strength, improving the yield of the optical imaging lens. Preferably, 5.44 ≤ f3 / (EP23+CT3) ≤ 7.70.

[0072] In this embodiment, the optical imaging lens further includes a third spacer, which is disposed between the third lens and the fourth lens and in direct contact with the image-side surface of the third lens. The radius of curvature R5 of the object-side surface of the third lens, the inner diameter d3s of the object-side surface of the third spacer, and the inner diameter d3m of the image-side surface of the third spacer satisfy the following condition: 1.0 < R5 / (d3s+d3m) < 3.0. By controlling R5 / (d3s+d3m) within a reasonable range, it is helpful to control the radial dimension of the third spacer, and to intercept stray light on the image-side surface of the third lens before the third spacer without affecting the principal parameters, thereby improving the imaging quality of the optical imaging lens. Preferably, 1.32 ≤ R5 / (d3s+d3m) ≤ 2.60.

[0073] It should be noted that when a large step-gap structure requires the addition of metal spacers, the weight of the metal spacers can be controlled by adjusting their size, keeping the total weight of the optical imaging lens within the required range. Since stray light from the metal spacers can only be optimized by modifying the structure of their inner diameter surfaces, the metal spacers can be used to intercept stray light during the weight reduction process of the optical imaging lens, helping to reduce stray light caused by reflections from the metal spacers. In other words, in this embodiment, when the second and third lenses form a large step-gap structure, controlling R5 / (d3s+d3m) within a reasonable range helps to control the size of the third spacer and thus its weight, in order to meet the weight reduction requirements of the optical imaging lens and simultaneously reduce stray light reflected from the third spacer.

[0074] In this embodiment, the optical imaging lens further includes a third spacer. The third spacer is disposed between the third lens and the fourth lens and directly contacts the image-side surface of the third lens. The outer diameter D3m of the image-side surface of the third spacer, the outer diameter D3s of the object-side surface of the third spacer, and the radius of curvature R6 of the image-side surface of the third lens satisfy the following condition: -2.5 < (D3s + D3m) / R6 < -1.0. By controlling (D3s + D3m) / R6 within a reasonable range, the difference in outer diameter between the first, second, and third lenses can be kept small, preventing large step differences at this point, which is more conducive to performance stability. It also helps to control the uniformity of step differences between lenses, preventing large step differences from accumulating between two lenses. This avoids the situation where a large step difference structure would require the use of metal spacers, causing the optical imaging lens to exceed weight tolerances and fail to meet customer requirements. In addition, it ensures that the maximum step difference size between lenses is limited to a reasonable range, which can effectively ensure assembly stability and thus ensure the stability of the optical imaging lens's performance yield. Preferably, -2.04≤(D3s+D3m) / R6≤-1.06.

[0075] In this embodiment, the optical imaging lens further includes a third spacer and a fourth spacer. The third spacer is disposed between the third and fourth lenses and directly contacts the image-side surface of the third lens. The fourth spacer is disposed between the fourth and fifth lenses and directly contacts the image-side surface of the fourth lens. The maximum thickness CP3 of the third spacer, the maximum thickness CP4 of the fourth spacer, and the effective focal length f5 of the fifth lens satisfy the following condition: -4.5 < f5 / (CP3+CP4) < -2.5. By controlling f5 / (CP3+CP4) within a reasonable range, the change in air gap along the optical axis between the third and fourth lenses and between the fourth and fifth lenses during assembly can be reduced by controlling the maximum thickness of the third and fourth spacers. This improves the problem of peak drop in the external field of view during assembly and enhances the performance of the optical imaging lens. Furthermore, by limiting the effective focal length of the fifth lens, light deflection can be limited, reducing stray light problems caused by the third and fourth spacers. Preferably, -4.09 ≤ f5 / (CP3+CP4) ≤ -2.69.

[0076] In this embodiment, the optical imaging lens further includes a third spacer and a fourth spacer. The third spacer is disposed between the third lens and the fourth lens and directly contacts the image-side surface of the third lens. The fourth spacer is disposed between the fourth lens and the fifth lens and directly contacts the image-side surface of the fourth lens. The radius of curvature R7 of the object-side surface of the fourth lens, the distance EP34 between the third and fourth spacers, and the center thickness CT4 of the fourth lens on the optical axis of the optical imaging lens satisfy the following condition: -5.0 < R7 / (CT4+EP34) < -3.5. By controlling R7 / (CT4+EP34) within a reasonable range, it is beneficial to ensure the molding of the fourth lens and the improvement of stray light. Considering the machinability of the mold, the uniformity of the contour shape of the fourth lens is ensured, avoiding the problem that the fourth lens is prone to breakage due to being too thin at the center or prone to chipping due to being too thin at the edges. In addition, it can avoid molding process problems such as affecting the surface shape, strength, and injection flow of the fourth lens, reduce the processing cost of the fourth lens, improve the compactness of the optical imaging lens structure, and also help correct off-axis aberrations and improve the overall image quality of the optical imaging lens. Preferably, -4.79≤R7 / (CT4+EP34)≤-3.78.

[0077] In this embodiment, the optical imaging lens further includes a fourth spacer. The fourth spacer is disposed between the fourth lens and the fifth lens and directly contacts the image-side surface of the fourth lens. The radius of curvature R10 of the image-side surface of the fifth lens, the outer diameter D4s of the object-side surface of the fourth spacer, and the inner diameter d4s of the object-side surface of the fourth spacer satisfy the following condition: 2.0 < R10 / (D4s-d4s) < 3.0. For optical imaging lenses with a small head and a large image plane, the outer diameters of the lenses before and after the fourth spacer are generally significantly different. Appropriately setting the type of the fourth spacer can ensure the stability of the assembly. By controlling R10 / (D4s-d4s) within a reasonable range, the minimum inner diameter of the fourth spacer can be constrained, reducing stray light generated at the inner diameter of the fourth spacer. This effectively controls the relative illumination at the edge of the field of view, reduces the sensitivity of the gap between the fourth and fifth lenses, and allows the optical imaging lens to still achieve clear imaging in low-light environments, ensuring good image quality. Simultaneously, the fourth lens bears the corresponding third-order distortion aberration, enabling the optical imaging lens to reasonably control distortion and ensuring that the roundness of the inner diameter of the lens barrel 10 is within the design requirements of the lens, thereby improving the assembly stability of the optical imaging lens. Preferably, 2.14≤R10 / (D4s-d4s)≤2.62.

[0078] Preferably, the fourth spacer is a metal spacer.

[0079] In this embodiment, the optical imaging lens further includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and directly contacts the image-side surface of the fourth lens. The maximum thickness CP4 of the fourth spacer, the radius of curvature R9 of the object-side surface of the fifth lens, the radius of curvature R8 of the image-side surface of the fourth lens, and the air gap T45 between the fourth and fifth lenses on the optical axis of the optical imaging lens satisfy the following condition: 3.5 < (R8 + R9) / (CP4 + T45) < 5.0. By controlling (R8 + R9) / (CP4 + T45) within a reasonable range, it is beneficial to control the center thickness of the fifth lens, while avoiding excessive weight due to the large volume and weight of the fifth lens and the thickness ratio exceeding the threshold, thus avoiding increased material costs. In addition, it can avoid the problem of weld lines in the fifth lens caused by an excessively thick thickness ratio, improve the processing and forming of the fifth lens, and avoid the risk of weld lines in advance. Furthermore, by controlling the arrangement of the fourth and fifth lenses, the greater the distance between them, the easier it is to select and match the fourth spacer, resulting in greater potential for improving stray light quality and ultimately enhancing the overall stray light quality of the optical imaging lens. Preferably, 3.76 ≤ (R8 + R9) / (CP4 + T45) ≤ 4.56. Example

[0080] like Figures 1 to 26As shown, the optical imaging lens includes a lens barrel 10, five lenses, and at least one spacer. The last lens is the fifth lens, and the diameter of the fifth lens is larger than the diameter of the other four lenses. The spacer contacts the lenses. The spacer located between the first lens and the second lens and in direct contact with the image side of the first lens is the first spacer. The center thickness CT1 of the first lens on the optical axis, the effective focal length f1 of the first lens, and the maximum thickness CP1 of the first spacer satisfy the following: 13.0 < f1 / (CP1+CT1) < 20.0. The lenses and spacers are both housed within the lens barrel 10, and the lenses are all in contact with the inner wall surface of the lens barrel 10.

[0081] By placing at least one spacer between two adjacent lenses, the reflection of light between them can be reduced, which helps to reduce stray light generation and ensure the imaging quality of the optical imaging lens. Simultaneously, assembling at least one spacer between two adjacent lenses facilitates the adjustment of the distance between them, ensuring the imaging quality of the optical imaging lens. Furthermore, the spacer ensures stable lens support, guaranteeing the stability of the lens assembly and effectively increasing the stability of the optical imaging lens assembly. Due to the structural limitations of the lens barrel 10, especially for small-head optical imaging lenses, the outer diameter of the mechanism cannot be too large due to the structural constraints of the lens barrel 10. Therefore, most important dimensions of small-head optical imaging lenses are at their limits, and stray light is relatively severe. Utilizing the diverging effect of the last lens of the optical imaging lens on light from the front optical system enables the optical imaging lens to have a large image plane, while also facilitating the correction of aberrations between edge and center rays, achieving high resolution, and improving the imaging quality of the optical imaging lens. Assembling the lenses and spacers within the lens barrel 10 fixes the position of each lens, preventing lens misalignment and tilting, and ensuring the stability of the optical imaging lens operation. Meanwhile, the lens barrel 10 protects the lens group, preventing collisions with other structural components and effectively ensuring the stability of the optical imaging lens. By limiting f1 / (CP1+CT1) within a reasonable range, the thickness of the first lens can be prevented from exceeding the threshold. Limiting the effective focal length of the first lens effectively restricts light deflection, preventing excessive curvature in the optical and mechanical parts of the first and second lenses, which could lead to forming problems. This improves the assembly stability of the first and second lenses, limits the assembly deformation of the optical imaging lens, and ensures its strength. Furthermore, the first and second lenses can share each other's edge thickness, ensuring their formability and providing a margin for mitigating severe stray light problems later, thus improving the yield rate of the optical imaging lens.

[0082] Preferably, the center thickness CT1 of the first lens on the optical axis, the effective focal length f1 of the first lens, and the maximum thickness CP1 of the first spacer satisfy the following: 13.45≤f1 / (CP1+CT1)≤19.47.

[0083] It should be noted that the spacer can intercept stray light paths, which helps to reduce stray light caused by reflection from the spacer. When stray light cannot be improved, an ink coating structure can be added to the spacer to improve stray light and provide a margin that meets the requirements.

[0084] It should be noted that spacers can be relatively thin light-blocking components or relatively thick spacers, serving a supporting and limiting function. Of course, the thickness of multiple spacers located between two lenses can be the same or different, depending on the specific requirements of the design. Similarly, the thickness of spacers located between different lenses can also be the same or different, depending on the specific design requirements.

[0085] The optical imaging lens provided in this application allows for different assembly methods for the lens, spacer elements, and lens barrel 10 depending on the product's operating environment. For example, a lens snap-fit ​​structure increases the stability of the offset, making it suitable for electronic devices with stringent shake parameters. Properly controlling the lens edge thickness can improve lens quality, and combining spacers of different thicknesses enhances the appearance of the optical imaging lens and avoids stray light, thus meeting market demands.

[0086] In this embodiment, the optical imaging lens also includes a fourth lens and a fourth spacer. The inner surface of the fourth spacer is stepped. The fourth spacer is located between the fourth and fifth lenses and is in direct contact with the image-side surface of the fourth lens. By adding a stepped microstructure to the inner diameter surface of the fourth spacer, the problem of light concentration can be effectively solved, reducing the risk of stray light from primary reflection when light directly hits the inner diameter surface of the fourth spacer. This weakens the stray light energy, resulting in less noticeable stray light in actual shooting. It eliminates the need for a stray light interceptor in front of the fourth spacer, thus reducing production costs. Furthermore, under the limit of the total weight of the optical imaging lens, adjusting the weight of the metal spacer is the most effective way to reduce weight. However, this results in a thinner wall thickness on the inner diameter slope of the spacer and the object-side surface of the fourth spacer, making spacer molding difficult. By adding a stepped microstructure to the inner surface of the fourth spacer, the wall thickness of the object-side surface near the inner surface of the fourth spacer can be increased, ensuring that the strength meets requirements after molding, enhancing assembly stability, and improving the yield of the optical imaging lens.

[0087] In this embodiment, the outer diameter D1m of the image side of the first spacer, the outer diameter D1s of the object side of the first spacer, the radius of curvature R1 of the object side of the first lens, and the radius of curvature R2 of the image side of the first lens satisfy the following condition: 2.0 < (D1m + D1s) / (R2 - R1) < 3.5. By controlling (D1m + D1s) / (R2 - R1) within a reasonable range and comprehensively considering the machinability of the mold, the uniformity of the contour shape of the first lens can be ensured, avoiding the problems of easy breakage due to excessively long mechanism parts and easy chipping of thin edges. At the same time, it can avoid problems affecting the molding process such as the surface shape, strength, and injection flow of the first lens, reducing the processing cost of the first lens. In addition, it can also avoid the increase in material cost due to excessive weight of the first lens, prevent the problem of weld lines caused by excessive thickness ratio of the first lens, facilitate the processing and molding of the first lens, and avoid the risk of weld lines in advance. Furthermore, by limiting the outer diameter of the image side and object side of the first spacer, difficulties in molding the first spacer can be avoided, ensuring the bearing stability of the first spacer. Preferably, 2.69≤(D1m+D1s) / (R2-R1)≤3.02.

[0088] In this embodiment, the central thickness CT2 of the second lens on the optical axis of the imaging lens, the maximum thickness CP2 of the second spacer, the inner diameter d2s of the object side of the second spacer, and the outer diameter D2s of the object side of the second spacer satisfy the following: 4.0 < (D2s - d2s) / (CT2 - CP2) < 7.5. By controlling (D2s - d2s) / (CT2 - CP2) within a reasonable range, the incident light rays from the second lens to the third lens can converge, allowing for a larger margin in the air gap between the second and third lenses on the optical axis. This is beneficial for improving the stability of the assembly of the second lens with its adjacent lenses. Furthermore, for a center-aperture lens, the second spacer is attached to the edge of the principal ray in the incident light rays, and controlling the thickness range of the second spacer can effectively block stray light without affecting the principal ray. Preferably, 4.42 ≤ (D2s - d2s) / (CT2 - CP2) ≤ 7.07.

[0089] In this embodiment, the outer diameter D2m of the image side of the second spacer, the outer diameter D2s of the object side of the second spacer, and the effective focal length f2 of the second lens satisfy the following condition: 1.0 < |f2 / (D2s+D2m)| < 2.0. By limiting |f2 / (D2s+D2m)| within a reasonable range, the contour of the image side of the second lens can be affected, which helps to improve the internal reflection stray light of the second and third lenses and improve the imaging quality of the optical imaging lens. In addition, by limiting the effective focal length of the second lens, the degree of deflection of light entering subsequent lenses can be limited, the shape of the lens can be improved, and the processing yield can be increased. Preferably, 1.41 ≤ |f2 / (D2s+D2m)| ≤ 1.71.

[0090] In this embodiment, the following parameters are satisfied: the center thickness CT1 of the first lens on the optical axis of the optical imaging lens; the inner diameter d1s of the object-side surface of the first spacer; the inner diameter d1m of the image-side surface of the first spacer; and the distance EP01 between the object-side surface of the front end face of the lens barrel and the first spacer: 2.0 < (EP01 - CT1) / (d1s - d1m) < 6.5. The structure between the first and fifth lenses forms a lens group. Assembling the lens group within the lens barrel 10 fixes the position of each lens, preventing lens misalignment or tilting, and ensuring the stability of the optical imaging lens during operation. Simultaneously, the lens barrel 10 protects the lens group, preventing collisions with the lenses from other structures, effectively ensuring the stability of the optical imaging lens during operation. By controlling (EP01-CT1) / (d1s-d1m) within a reasonable range, sufficient overall lens thickness can be maintained at the head of the lens barrel 10. This strengthens the bearing strength of the first lens's top surface. With the exit hole position fixed, the flared position can be freely adjusted to ensure sufficient overall lens thickness at the light-transmitting hole position. This helps to mitigate the feathering and other stray light caused by insufficient overall lens thickness during injection molding, which results in a bright, white exit hole. While ensuring the thickness-to-diameter ratio and diameter-to-thickness ratio of the first lens, maintaining the overall thickness and strength of the lens at the head of the lens barrel 10 prevents the light source from directly penetrating the lens barrel 10, avoiding unavoidable stray light. Furthermore, if the thickness-to-thickness ratio of the first lens exceeds a threshold, controlling (EP01-CT1) / (d1s-d1m) within a reasonable range reduces stray light caused by weld lines, improving the imaging quality of the optical imaging lens. Preferably, 2.49 ≤ (EP01-CT1) / (d1s-d1m) ≤ 6.30.

[0091] In this embodiment, the optical imaging lens further includes a third spacer, which is disposed between the third lens and the fourth lens and directly contacts the image-side surface of the third lens. The spacing EP23 between the second and third spacers, the center thickness CT3 of the third lens on the optical axis of the optical imaging lens, and the effective focal length f3 of the third lens satisfy the following condition: 5.0 < f3 / (EP23+CT3) < 8.0. By controlling f3 / (EP23+CT3) within a reasonable range, the shape of the third lens can be restricted, ensuring the rationality of the direction of incident light when passing through the third lens, effectively blocking stray light, and allowing the second lens to bear the corresponding third-order distortion aberration, enabling the optical imaging lens to reasonably control distortion and improve the imaging quality of the optical imaging lens. In addition, improving the structural uniformity and overall structural strength of the second and third spacers improves the yield of the optical imaging lens. Preferably, 5.44 ≤ f3 / (EP23+CT3) ≤ 7.70.

[0092] In this embodiment, the optical imaging lens further includes a third spacer, which is disposed between the third lens and the fourth lens and in direct contact with the image-side surface of the third lens. The radius of curvature R5 of the object-side surface of the third lens, the inner diameter d3s of the object-side surface of the third spacer, and the inner diameter d3m of the image-side surface of the third spacer satisfy the following condition: 1.0 < R5 / (d3s+d3m) < 3.0. By controlling R5 / (d3s+d3m) within a reasonable range, it is helpful to control the radial dimension of the third spacer, and to intercept stray light on the image-side surface of the third lens before the third spacer without affecting the principal parameters, thereby improving the imaging quality of the optical imaging lens. Preferably, 1.32 ≤ R5 / (d3s+d3m) ≤ 2.60.

[0093] It should be noted that when a large step-gap structure requires the addition of metal spacers, the weight of the metal spacers can be controlled by adjusting their size, keeping the total weight of the optical imaging lens within the required range. Since stray light from the metal spacers can only be optimized by modifying the structure of their inner diameter surfaces, the metal spacers can be used to intercept stray light during the weight reduction process of the optical imaging lens, helping to reduce stray light caused by reflections from the metal spacers. In other words, in this embodiment, when the second and third lenses form a large step-gap structure, controlling R5 / (d3s+d3m) within a reasonable range helps to control the size of the third spacer and thus its weight, in order to meet the weight reduction requirements of the optical imaging lens and simultaneously reduce stray light reflected by the third spacer.

[0094] In this embodiment, the optical imaging lens further includes a third spacer. The third spacer is disposed between the third lens and the fourth lens and directly contacts the image-side surface of the third lens. The outer diameter D3m of the image-side surface of the third spacer, the outer diameter D3s of the object-side surface of the third spacer, and the radius of curvature R6 of the image-side surface of the third lens satisfy the following condition: -2.5 < (D3s + D3m) / R6 < -1.0. By controlling (D3s + D3m) / R6 within a reasonable range, the difference in outer diameter between the first, second, and third lenses can be kept small, preventing large step differences at this point, which is more conducive to performance stability. It also helps to control the uniformity of step differences between lenses, preventing large step differences from accumulating between two lenses. This avoids the situation where a large step difference structure would require the use of metal spacers, causing the optical imaging lens to exceed weight tolerances and fail to meet customer requirements. In addition, it ensures that the maximum step difference size between lenses is limited to a reasonable range, which can effectively guarantee assembly stability and thus ensure the stability of the optical imaging lens's performance yield. Preferably, -2.04≤(D3s+D3m) / R6≤-1.06.

[0095] In this embodiment, the optical imaging lens further includes a third spacer and a fourth spacer. The third spacer is disposed between the third and fourth lenses and directly contacts the image-side surface of the third lens. The fourth spacer is disposed between the fourth and fifth lenses and directly contacts the image-side surface of the fourth lens. The maximum thickness CP3 of the third spacer, the maximum thickness CP4 of the fourth spacer, and the effective focal length f5 of the fifth lens satisfy the following condition: -4.5 < f5 / (CP3+CP4) < -2.5. By controlling f5 / (CP3+CP4) within a reasonable range, the change in air gap along the optical axis between the third and fourth lenses and between the fourth and fifth lenses during assembly can be reduced by controlling the maximum thickness of the third and fourth spacers. This improves the problem of peak drop in the external field of view during assembly and enhances the performance of the optical imaging lens. Furthermore, by limiting the effective focal length of the fifth lens, light deflection can be limited, reducing stray light problems caused by the third and fourth spacers. Preferably, -4.09 ≤ f5 / (CP3+CP4) ≤ -2.69.

[0096] In this embodiment, the optical imaging lens further includes a third spacer and a fourth spacer. The third spacer is disposed between the third and fourth lenses and directly contacts the image-side surface of the third lens. The fourth spacer is disposed between the fourth and fifth lenses and directly contacts the image-side surface of the fourth lens. The radius of curvature R7 of the object-side surface of the fourth lens, the distance EP34 between the third and fourth spacers, and the center thickness CT4 of the fourth lens on the optical axis of the optical imaging lens satisfy the following condition: -5.0 < R7 / (CT4+EP34) < -3.5. By controlling R7 / (CT4+EP34) within a reasonable range, it is beneficial to ensure the molding of the fourth lens and the improvement of stray light. Considering the machinability of the mold, the uniformity of the contour shape of the fourth lens is ensured, avoiding the problems of the fourth lens being too thin at the center and prone to breakage, or too thin at the edges and prone to chipping. In addition, it can avoid molding process problems such as affecting the surface shape, strength, and injection flow of the fourth lens, reduce the processing cost of the fourth lens, improve the compactness of the optical imaging lens structure, and also help correct off-axis aberrations and improve the overall image quality of the entire optical imaging lens. Preferably, -4.79≤R7 / (CT4+EP34)≤-3.78.

[0097] In this embodiment, the optical imaging lens further includes a fourth spacer. The fourth spacer is disposed between the fourth lens and the fifth lens and directly contacts the image-side surface of the fourth lens. The radius of curvature R10 of the image-side surface of the fifth lens, the outer diameter D4s of the object-side surface of the fourth spacer, and the inner diameter d4s of the object-side surface of the fourth spacer satisfy the following condition: 2.0 < R10 / (D4s-d4s) < 3.0. For optical imaging lenses with a small head and a large image plane, the outer diameters of the lenses before and after the fourth spacer are generally significantly different. Appropriately setting the type of the fourth spacer can ensure the stability of the assembly. By controlling R10 / (D4s-d4s) within a reasonable range, the minimum inner diameter of the fourth spacer can be constrained, reducing stray light generated at the inner diameter of the fourth spacer. This effectively controls the relative illumination at the edge of the field of view, reduces the sensitivity of the gap between the fourth and fifth lenses, and allows the optical imaging lens to still achieve clear imaging in low-light environments, ensuring good image quality. Simultaneously, the fourth lens bears the corresponding third-order distortion aberration, enabling the optical imaging lens to reasonably control distortion and ensuring that the roundness of the inner diameter of the lens barrel 10 is within the design requirements of the lens, thereby improving the assembly stability of the optical imaging lens. Preferably, 2.14≤R10 / (D4s-d4s)≤2.62.

[0098] Preferably, the fourth spacer is a metal spacer.

[0099] In this embodiment, the optical imaging lens further includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and in direct contact with the image-side surface of the fourth lens. The maximum thickness CP4 of the fourth spacer, the radius of curvature R9 of the object-side surface of the fifth lens, the radius of curvature R8 of the image-side surface of the fourth lens, and the air gap T45 between the fourth and fifth lenses on the optical axis of the optical imaging lens satisfy the following condition: 3.5 < (R8 + R9) / (CP4 + T45) < 5.0. By controlling (R8 + R9) / (CP4 + T45) within a reasonable range, it is beneficial to control the center thickness of the fifth lens, while avoiding excessive weight due to the large volume and weight of the fifth lens and the thickness ratio exceeding the threshold, thus avoiding increased material costs. In addition, it can avoid the problem of weld lines in the fifth lens caused by an excessively thick thickness ratio, improve the processing and forming of the fifth lens, and avoid the risk of weld lines in advance. Furthermore, by controlling the arrangement of the fourth and fifth lenses, the greater the distance between them, the easier it is to select and match the fourth spacer, resulting in greater potential for improving stray light quality and ultimately enhancing the overall stray light quality of the optical imaging lens. Preferably, 3.76 ≤ (R8 + R9) / (CP4 + T45) ≤ 4.56.

[0100] Optionally, the aforementioned optical imaging lens may also include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0101] The optical imaging lens in this application can employ multiple lenses, such as the five lenses mentioned above. By rationally allocating the optical power, surface shape, center thickness of each lens, and on-axis distance between each lens, the aperture of the optical imaging lens can be effectively increased, the sensitivity of the lens can be reduced, and the manufacturability of the lens can be improved, making the optical imaging lens more conducive to production and processing and suitable for portable electronic devices such as smartphones.

[0102] In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0103] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although five lenses are described as an example in the embodiments, the optical imaging lens is not limited to including five lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0104] Figure 1 A schematic diagram of the structure of an optical imaging lens of this application is shown, wherein Figure 1 The diagram clearly shows parameters such as D2S and D3m to provide a clear and intuitive understanding of their meaning. To better illustrate the optical imaging lens structure and specific surface features, these parameters will not be shown in the accompanying diagrams when explaining specific examples.

[0105] Figure 2 The diagram shows the stray light trend in an optical imaging lens of this application. Figure 2 The stray light is reflected from the image side of the first lens to the object side of the first lens. Then, some of the stray light is reflected to the first spacer P1, where it is absorbed. The remaining stray light is then reflected by the first spacer P1 to the third spacer P3, where it is absorbed. Of course... Figure 2 The paper only shows one optical path for stray light absorption, but the optical paths for stray light absorption will also be different for different structures. The structural design in this application can reduce the generation of stray light.

[0106] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical imaging lenses applicable to the above embodiments.

[0107] It should be noted that in the following example, there are both a first state and a second state. In the same example, the first, second, third, fourth, and fifth lenses of the optical imaging lens have the same radius of curvature, center thickness, inter-lens spacing, and higher-order coefficients in both the first and second states. However, the parameters of the lens barrel 10, the thickness of the spacers, the inner and outer diameters of the spacers, the distance between the spacers, and the shape of some lenses are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0108] It should be noted that any of the examples one through four below are applicable to all embodiments of this application.

[0109] Example 1

[0110] like Figures 3 to 8 As shown, an optical imaging lens of Example 1 of this application is described. Figure 3 A schematic diagram of the optical imaging lens in Example 1 in its first state is shown. Figure 4 A schematic diagram of the optical imaging lens of Example 1 in the second state is shown.

[0111] like Figure 3 and Figure 4 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, and a fifth lens E5.

[0112] exist Figure 3 In this configuration, both the first lens E1 and the second lens E2 rest against the first spacer P1, and are spaced apart from each other at other locations. Both the second lens E2 and the third lens E3 rest against the second spacer P2, and are spaced apart from each other at other locations. A third auxiliary spacer P3b is also provided between the third spacer P3 and the fourth lens E4. There are two spacers between the third lens E3 and the fourth lens E4 to achieve a primary step difference, and two spacers between the fourth lens E4 and the fifth lens E5 to achieve a secondary step difference. This design achieves a large step difference while ensuring stable support for each component.

[0113] exist Figure 4In this configuration, both the first lens E1 and the second lens E2 abut against the first spacer P1, with other positions showing a gap between them. Both the second lens E2 and the third lens E3 abut against the second spacer P2, with other positions showing a gap between them. The third lens E3 and the fourth lens E4 engage to form an engagement structure, with the third spacer P3 positioned inside the engagement structure. Outside the third spacer P3, the third lens E3 abuts against the fourth lens E4. Two spacers exist between the fourth lens E4 and the fifth lens E5 to achieve a single-step adjustment, which also facilitates stable support of each component.

[0114] The first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has positive optical power, its object-side surface S7 is concave, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. Light from the object passes sequentially through surfaces S1 to S10 and is finally imaged on the imaging plane.

[0115] Table 1 shows the basic structural parameters of the optical imaging lens in Example 1, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0116]

[0117] In Example 1, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the fifth lens E5, are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0118] Formula (1);

[0119] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R, and the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical mirrors S1-S10 in Example 1.

[0120]

[0121] Figure 5 The on-axis chromatic aberration curve of an optical imaging lens in Example 1 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 6 The magnification chromatic aberration curve of the optical imaging lens in Example 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens. Figure 7 The astigmatism curve of the optical imaging lens in Example 1 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 8 The distortion curve of the optical imaging lens in Example 1 is shown, which represents the distortion magnitude corresponding to different field of view angles.

[0122] according to Figures 5 to 8 As can be seen, the optical imaging lens given in Example 1 can achieve good image quality.

[0123] Example 2

[0124] like Figures 9 to 14 As shown, an optical imaging lens of Example 2 of this application is described. Figure 9 A schematic diagram of the optical imaging lens in Example 2 in its first state is shown. Figure 10 A schematic diagram of the optical imaging lens in Example 2 in the second state is shown.

[0125] like Figure 9 and Figure 10 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, and a fifth lens E5.

[0126] exist Figure 9 In this configuration, both the first lens E1 and the second lens E2 rest against the first spacer P1, and are spaced apart from each other at other locations. Both the second lens E2 and the third lens E3 rest against the second spacer P2, and are spaced apart from each other at other locations. A third auxiliary spacer P3b is also provided between the third spacer P3 and the fourth lens E4. There are two spacers between the third lens E3 and the fourth lens E4 to achieve a primary step difference, and two spacers between the fourth lens E4 and the fifth lens E5 to achieve a secondary step difference. This design achieves a large step difference while ensuring stable support for each component.

[0127] exist Figure 10In this configuration, both the first lens E1 and the second lens E2 rest against the first spacer P1, and are spaced apart from each other at other locations. Both the second lens E2 and the third lens E3 rest against the second spacer P2, and are spaced apart from each other at other locations. Both the third lens E3 and the fourth lens E4 rest against the third spacer P3, and are spaced apart from each other at other locations. Two spacers are placed between the fourth lens E4 and the fifth lens E5 to achieve a single-step adjustment, which also facilitates stable support for each component.

[0128] The first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has positive optical power, its object-side surface S7 is concave, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. Light from the object passes sequentially through surfaces S1 to S10 and is finally imaged on the imaging plane.

[0129] Table 3 shows the basic structural parameters of the optical imaging lens in Example 2, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0130]

[0131] Table 4 shows the higher-order coefficients that can be used for each aspherical mirror in Example 2, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0132]

[0133] Figure 11 The on-axis chromatic aberration curve of the optical imaging lens in Example 2 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 12 The magnification chromatic aberration curve of the optical imaging lens in Example 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens. Figure 13 The astigmatism curve of the optical imaging lens in Example 2 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 14 The distortion curve of the optical imaging lens in Example 2 is shown, which represents the distortion magnitude corresponding to different field of view angles.

[0134] according to Figures 11 to 14As can be seen, the optical imaging lens given in Example 2 can achieve good imaging quality.

[0135] Example 3

[0136] like Figures 15 to 20 As shown, an optical imaging lens of Example 3 of this application is described. Figure 15 A schematic diagram of the optical imaging lens in Example 3 in its first state is shown. Figure 16 A schematic diagram of the optical imaging lens in Example 3 in the second state is shown.

[0137] like Figure 15 and Figure 16 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, and a fifth lens E5.

[0138] exist Figure 15 In this configuration, both the first lens E1 and the second lens E2 rest against the first spacer P1, and are spaced apart from each other at other locations. Both the second lens E2 and the third lens E3 rest against the second spacer P2, and are spaced apart from each other at other locations. A third auxiliary spacer P3b is also provided between the third spacer P3 and the fourth lens E4. There are two spacers between the third lens E3 and the fourth lens E4 to achieve a primary step difference, and two spacers between the fourth lens E4 and the fifth lens E5 to achieve a secondary step difference. This design achieves a large step difference while ensuring stable support for each component.

[0139] exist Figure 16 In this configuration, both the first lens E1 and the second lens E2 rest against the first spacer P1, and are spaced apart from each other at other locations. Both the second lens E2 and the third lens E3 rest against the second spacer P2, and are spaced apart from each other at other locations. Both the third lens E3 and the fourth lens E4 rest against the third spacer P3, and are spaced apart from each other at other locations. Two spacers are placed between the fourth lens E4 and the fifth lens E5 to achieve a single-step adjustment, which also facilitates stable support for each component.

[0140] The first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has positive optical power, its object-side surface S7 is concave, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. Light from the object passes sequentially through surfaces S1 to S10 and is finally imaged on the imaging plane.

[0141] Table 5 shows the basic structural parameters of the optical imaging lens in Example 3, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0142]

[0143] Table 6 shows the higher-order coefficients that can be used for each aspherical mirror in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0144]

[0145] Figure 17 The on-axis chromatic aberration curve of the optical imaging lens in Example 3 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 18 The magnification chromatic aberration curve of the optical imaging lens in Example 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens. Figure 19 The astigmatism curve of the optical imaging lens in Example 3 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 20 The distortion curve of the optical imaging lens in Example 3 is shown, which represents the distortion magnitude corresponding to different field of view angles.

[0146] according to Figures 17 to 20 As can be seen, the optical imaging lens given in Example 3 can achieve good imaging quality.

[0147] Example 4

[0148] like Figures 21 to 26 As shown, an optical imaging lens of Example 4 of this application is described. Figure 21 A schematic diagram of the optical imaging lens in Example 4 in its first state is shown. Figure 22 A schematic diagram of the optical imaging lens in Example 4 in the second state is shown.

[0149] like Figure 21 and Figure 22 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, and a fifth lens E5.

[0150] exist Figure 21 In this configuration, both the first lens E1 and the second lens E2 rest against the first spacer P1, and are spaced apart from each other at other locations. Both the second lens E2 and the third lens E3 rest against the second spacer P2, and are spaced apart from each other at other locations. A third auxiliary spacer P3b is also provided between the third spacer P3 and the fourth lens E4. The presence of two spacers between the third lens E3 and the fourth lens E4 achieves a primary step difference, while two spacers between the fourth lens E4 and the fifth lens E5 achieve a secondary step difference. This configuration allows for a large step difference while ensuring stable support for each component.

[0151] exist Figure 22 In this configuration, both the first lens E1 and the second lens E2 rest against the first spacer P1, and are spaced apart from each other at other locations. Both the second lens E2 and the third lens E3 rest against the second spacer P2, and are spaced apart from each other at other locations. Both the third lens E3 and the fourth lens E4 rest against the third spacer P3, and are spaced apart from each other at other locations. Two spacers are placed between the fourth lens E4 and the fifth lens E5 to achieve a single-step adjustment, which also facilitates stable support for each component.

[0152] The first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has positive optical power, its object-side surface S7 is concave, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. Light from the object passes sequentially through surfaces S1 to S10 and is finally imaged on the imaging plane.

[0153] Table 7 shows the basic structural parameters of the optical imaging lens in Example 4, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0154]

[0155] Table 8 shows the higher-order coefficients that can be used for each aspherical mirror in Example 4, wherein each aspherical surface type can be defined by formula (1) given in Example 1 above.

[0156]

[0157] Figure 23 The on-axis chromatic aberration curve of the optical imaging lens in Example 4 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 24 The magnification chromatic aberration curve of the optical imaging lens in Example 4 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens. Figure 25 The astigmatism curves of the optical imaging lens in Example 4 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 26 The distortion curve of the optical imaging lens in Example 4 is shown, which represents the distortion magnitude corresponding to different field of view angles.

[0158] according to Figures 23 to 26 As can be seen, the optical imaging lens given in Example 4 can achieve good imaging quality.

[0159] In summary, Examples 1 to 4 satisfy the relationships shown in Table 9.

[0160]

[0161] Table 10 provides some parameters of the optical imaging lenses for Examples 1 to 4.

[0162]

[0163] It should be noted that in Tables 9 and 10, 1-1 represents the optical imaging lens in Example 1 in the first state, 1-2 represents the optical imaging lens in Example 1 in the second state, 2-1 represents the optical imaging lens in Example 2 in the first state, 2-2 represents the optical imaging lens in Example 2 in the second state, 3-1 represents the optical imaging lens in Example 3 in the first state, 3-2 represents the optical imaging lens in Example 3 in the second state, 4-1 represents the optical imaging lens in Example 4 in the first state, and 4-2 represents the optical imaging lens in Example 4 in the second state.

[0164] Table 11 shows the effective focal lengths of the lenses in Examples 1 through 4.

[0165]

[0166] This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0167] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0168] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0169] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0170] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical imaging lens, characterized in that, The optical imaging lens consists of five lenses with optical power, and includes: The system comprises five lenses, with the last lens being the fifth lens. The diameter of the fifth lens is larger than that of the other four lenses. The first lens has positive optical power, with a convex object-side surface and a concave image-side surface. The second lens has negative optical power, with a convex object-side surface and a concave image-side surface. The third lens has positive optical power, with a convex object-side surface and a convex image-side surface. The fourth lens has positive optical power, with a concave object-side surface and a convex image-side surface. The fifth lens has negative optical power, with a convex object-side surface and a concave image-side surface. At least one spacer is provided, the spacer being in contact with the lens, wherein the spacer located between the first lens and the second lens and in direct contact with the image-side surface of the first lens is the first spacer, and the spacer located between the second lens and the third lens and in direct contact with the image-side surface of the second lens is the second spacer, wherein the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, and the spacing EP12 between the first spacer and the second spacer satisfy the following: 6.84≤(R3-R4) / EP12<11.0; The optical imaging lens further includes a third spacer and a fourth spacer. The third spacer is disposed between the third lens and the fourth lens and is in direct contact with the image-side surface of the third lens. The fourth spacer is disposed between the fourth lens and the fifth lens and is in direct contact with the image-side surface of the fourth lens. The radius of curvature R7 of the object-side surface of the fourth lens, the distance EP34 between the third spacer and the fourth spacer, and the center thickness CT4 of the fourth lens on the optical axis of the optical imaging lens satisfy the following condition: -4.79≤R7 / (CT4+EP34)≤-3.

78. The lens and the spacer are both housed within the lens barrel, and the lens is in contact with the inner wall surface of the lens barrel.

2. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and is in direct contact with the image side of the fourth lens. The inner surface of the fourth spacer is stepped.

3. The optical imaging lens according to claim 1, characterized in that, The center thickness CT1 of the first lens on the optical axis of the optical imaging lens, the effective focal length f1 of the first lens, and the maximum thickness CP1 of the first spacer satisfy the following: 13.45≤f1 / (CP1+CT1)≤19.

47.

4. The optical imaging lens according to claim 1, characterized in that, The outer diameter D1m of the image side of the first spacer, the outer diameter D1s of the object side of the first spacer, the radius of curvature R1 of the object side of the first lens, and the radius of curvature R2 of the image side of the first lens satisfy the following: 2.69≤(D1m+D1s) / (R2-R1)≤3.

02.

5. The optical imaging lens according to claim 1, characterized in that, The central thickness CT2 of the second lens on the optical axis of the optical imaging lens, the maximum thickness CP2 of the second spacer, the inner diameter d2s of the object side of the second spacer, and the outer diameter D2s of the object side of the second spacer satisfy the following: 4.42≤(D2s-d2s) / (CT2-CP2)≤7.

07.

6. The optical imaging lens according to claim 1, characterized in that, The outer diameter D2m of the image side of the second spacer, the outer diameter D2s of the object side of the second spacer, and the effective focal length f2 of the second lens satisfy the following condition: 1.41≤|f2 / (D2s+D2m)|≤1.

71.

7. The optical imaging lens according to claim 1, characterized in that, The following conditions must be met for the first lens to satisfy the following: center thickness CT1 on the optical axis of the optical imaging lens, inner diameter d1s of the object side of the first spacer, inner diameter d1m of the image side of the first spacer, and the distance EP01 between the object side of the front end face of the lens barrel and the first spacer: 2.49≤(EP01-CT1) / (d1s-d1m)≤6.

30.

8. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further includes a third spacer, which is disposed between the third lens and the fourth lens and directly contacts the image side of the third lens. The spacing EP23 between the second spacer and the third spacer, the center thickness CT3 of the third lens on the optical axis of the optical imaging lens, and the effective focal length f3 of the third lens satisfy the following: 5.44≤f3 / (EP23+CT3)≤7.

70.

9. The optical imaging lens according to any one of claims 1 to 8, characterized in that, The optical imaging lens further includes a third spacer, which is disposed between the third lens and the fourth lens and in direct contact with the image side of the third lens. The radius of curvature R5 of the object side of the third lens, the inner diameter d3s of the object side of the third spacer, and the inner diameter d3m of the image side of the third spacer satisfy the following: 1.32≤R5 / (d3s+d3m)≤2.

60.

10. The optical imaging lens according to any one of claims 1 to 8, characterized in that, The optical imaging lens further includes a third spacer, which is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The outer diameter D3m of the image side of the third spacer, the outer diameter D3s of the object side of the third spacer, and the radius of curvature R6 of the image side of the third lens satisfy the following condition: -2.04≤(D3s+D3m) / R6≤-1.

06.

11. The optical imaging lens according to any one of claims 1 to 8, characterized in that, The optical imaging lens further includes a third spacer and a fourth spacer. The third spacer is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The fourth spacer is disposed between the fourth lens and the fifth lens and is in direct contact with the image side of the fourth lens. The maximum thickness CP3 of the third spacer, the maximum thickness CP4 of the fourth spacer, and the effective focal length f5 of the fifth lens satisfy the following condition: -4.09≤f5 / (CP3+CP4)≤-2.

69.

12. The optical imaging lens according to any one of claims 1 to 8, characterized in that, The optical imaging lens further includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens. The radius of curvature R10 of the image side of the fifth lens, the outer diameter D4s of the object side of the fourth spacer, and the inner diameter d4s of the object side of the fourth spacer satisfy the following: 2.14≤R10 / (D4s-d4s)≤2.

62.

13. The optical imaging lens according to any one of claims 1 to 8, characterized in that, The optical imaging lens further includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and in direct contact with the image-side surface of the fourth lens. The maximum thickness CP4 of the fourth spacer, the radius of curvature R9 of the object-side surface of the fifth lens, the radius of curvature R8 of the image-side surface of the fourth lens, and the air gap T45 between the fourth lens and the fifth lens on the optical axis of the optical imaging lens satisfy the following: 3.76≤(R8+R9) / (CP4+T45)≤4.

56.

14. An optical imaging lens, characterized in that, The optical imaging lens consists of five lenses with optical power, and includes: The system comprises five lenses, with the last lens being the fifth lens. The diameter of the fifth lens is larger than that of the other four lenses. The first lens has positive optical power, with a convex object-side surface and a concave image-side surface. The second lens has negative optical power, with a convex object-side surface and a concave image-side surface. The third lens has positive optical power, with a convex object-side surface and a convex image-side surface. The fourth lens has positive optical power, with a concave object-side surface and a convex image-side surface. The fifth lens has negative optical power, with a convex object-side surface and a concave image-side surface. At least one spacer is provided, the spacer being in contact with the lens, wherein the spacer located between the first lens and the second lens and in direct contact with the image side of the first lens is the first spacer, and the center thickness CT1 of the first lens on the optical axis, the effective focal length f1 of the first lens, and the maximum thickness CP1 of the first spacer satisfy the following: 13.45≤f1 / (CP1+CT1)≤19.

47. The optical imaging lens further includes a third spacer and a fourth spacer. The third spacer is disposed between the third lens and the fourth lens and is in direct contact with the image-side surface of the third lens. The fourth spacer is disposed between the fourth lens and the fifth lens and is in direct contact with the image-side surface of the fourth lens. The radius of curvature R7 of the object-side surface of the fourth lens, the distance EP34 between the third spacer and the fourth spacer, and the center thickness CT4 of the fourth lens on the optical axis of the optical imaging lens satisfy the following: -4.79≤R7 / (CT4+EP34)≤-3.78; The lens and the spacer are both housed within the lens barrel, and the lens is in contact with the inner wall surface of the lens barrel.

15. The optical imaging lens according to claim 14, characterized in that, The optical imaging lens further includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and is in direct contact with the image side of the fourth lens. The inner surface of the fourth spacer is stepped.

16. The optical imaging lens according to claim 14, characterized in that, The outer diameter D1m of the image side of the first spacer, the outer diameter D1s of the object side of the first spacer, the radius of curvature R1 of the object side of the first lens, and the radius of curvature R2 of the image side of the first lens satisfy the following: 2.69≤(D1m+D1s) / (R2-R1)≤3.

02.

17. The optical imaging lens according to claim 14, characterized in that, The optical imaging lens further includes a second spacer, which is disposed between the second lens and the third lens and directly contacts the image side of the second lens. The center thickness CT2 of the second lens on the optical axis of the optical imaging lens, the maximum thickness CP2 of the second spacer, the inner diameter d2s of the object side of the second spacer, and the outer diameter D2s of the object side of the second spacer satisfy the following: 4.42≤(D2s-d2s) / (CT2-CP2)≤7.

07.

18. The optical imaging lens according to claim 14, characterized in that, The optical imaging lens further includes a second spacer, which is disposed between the second lens and the third lens and is in direct contact with the image side of the second lens. The outer diameter D2m of the image side of the second spacer, the outer diameter D2s of the object side of the second spacer, and the effective focal length f2 of the second lens satisfy the following: 1.41≤|f2 / (D2s+D2m)|≤1.

71.

19. The optical imaging lens according to claim 14, characterized in that, The following conditions must be met for the first lens to satisfy the following: center thickness CT1 on the optical axis of the optical imaging lens, inner diameter d1s of the object side of the first spacer, inner diameter d1m of the image side of the first spacer, and the distance EP01 between the object side of the front end face of the lens barrel and the first spacer: 2.49≤(EP01-CT1) / (d1s-d1m)≤6.

30.

20. The optical imaging lens according to claim 14, characterized in that, The optical imaging lens further includes a second spacer and a third spacer. The second spacer is disposed between the second lens and the third lens and is in direct contact with the image side of the second lens. The third spacer is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The spacing EP23 between the second spacer and the third spacer, the center thickness CT3 of the third lens on the optical axis of the optical imaging lens, and the effective focal length f3 of the third lens satisfy the following condition: 5.44≤f3 / (EP23+CT3)≤7.

70.

21. The optical imaging lens according to any one of claims 14 to 20, characterized in that, The optical imaging lens further includes a third spacer, which is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The radius of curvature R5 of the object side of the third lens, the inner diameter d3s of the object side of the third spacer, and the inner diameter d3m of the image side of the third spacer satisfy the following: 1.32≤R5 / (d3s+d3m)≤2.

60.

22. The optical imaging lens according to any one of claims 14 to 20, characterized in that, The optical imaging lens further includes a third spacer, which is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The outer diameter D3m of the image side of the third spacer, the outer diameter D3s of the object side of the third spacer, and the radius of curvature R6 of the image side of the third lens satisfy the following condition: -2.04≤(D3s+D3m) / R6≤-1.

06.

23. The optical imaging lens according to any one of claims 14 to 20, characterized in that, The optical imaging lens further includes a third spacer and a fourth spacer. The third spacer is disposed between the third lens and the fourth lens and is in direct contact with the image side of the third lens. The fourth spacer is disposed between the fourth lens and the fifth lens and is in direct contact with the image side of the fourth lens. The maximum thickness CP3 of the third spacer, the maximum thickness CP4 of the fourth spacer, and the effective focal length f5 of the fifth lens satisfy the following condition: -4.09≤f5 / (CP3+CP4)≤-2.

69.

24. The optical imaging lens according to any one of claims 14 to 20, characterized in that, The optical imaging lens further includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and in direct contact with the image side of the fourth lens. The radius of curvature R10 of the image side of the fifth lens, the outer diameter D4s of the object side of the fourth spacer, and the inner diameter d4s of the object side of the fourth spacer satisfy the following: 2.14≤R10 / (D4s-d4s)≤2.

62.

25. The optical imaging lens according to any one of claims 14 to 20, characterized in that, The optical imaging lens further includes a fourth spacer, which is disposed between the fourth lens and the fifth lens and in direct contact with the image-side surface of the fourth lens. The maximum thickness CP4 of the fourth spacer, the radius of curvature R9 of the object-side surface of the fifth lens, the radius of curvature R8 of the image-side surface of the fourth lens, and the air gap T45 between the fourth lens and the fifth lens on the optical axis of the optical imaging lens satisfy the following: 3.76≤(R8+R9) / (CP4+T45)≤4.56.

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