Optical imaging lens

Abstract

The present application discloses an optical imaging lens, which includes a lens barrel and five lenses and multiple spacer elements arranged in the lens barrel; the five lenses are a first lens with positive optical power, a second lens with optical power, a third lens with optical power, a fourth lens with positive optical power, and a fifth lens with negative optical power; the multiple spacer elements include a third spacer element and a fourth spacer element; the effective focal length f and the combined focal length f23 of the second lens and the third lens satisfy: -3.90 < f23 / f < -1.00; the inner diameter d3s of the object side surface of the third spacer element perpendicular to the optical axis plane and the spacing distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element in the optical axis direction satisfy: 1.45 < d3s / EP34 < 2.60. Using the optical imaging lens of the present application, stray light generation can be suppressed and the imaging picture quality can be improved.

Description

Technical Field

[0001] This application generally relates to the field of optical imaging equipment technology. More specifically, this application relates to an optical imaging lens. Background Technology

[0002] In the field of optical imaging for mobile devices such as smartphones, with the continuous growth of user demand for telephoto shooting, the design and application of super telephoto lenses have become a key aspect of improving device imaging performance. Among them, the super telephoto lens design using five plastic lenses is widely used in the industry due to its advantages such as small size and easy integration into thin and light devices. It can help mobile devices achieve clear imaging at greater distances and enrich shooting scenarios.

[0003] In the design of super telephoto lenses, in order to meet the telephoto characteristics of the lens module, the spacing between some adjacent lenses is designed to be relatively large in order to lengthen the system focal length. However, excessively large gaps can cause a series of problems: on the one hand, light is prone to multiple reflections within the gap, forming stray light, which can lead to phenomena such as light spots and hazy blur in the image, severely reducing image quality; on the other hand, longer lens spacing can also easily affect the stability of the lens structure.

[0004] In view of this, there is an urgent need to provide an optical imaging lens in order to suppress stray light generation and improve the stability of the lens structure. Summary of the Invention

[0005] In order to at least solve one or more of the technical problems mentioned above, this application provides an optical imaging lens in several aspects.

[0006] In a first aspect, the present application provides an optical imaging lens, comprising a lens barrel and a lens group and a plurality of spacer elements disposed in the lens barrel; the lens barrel includes an object-side end face, an image-side end face, an outer ring face and an inner ring face, and the inner ring face is stepped; the lens group consists of five lenses, and the five lenses are, in order from the object side to the image side, a first lens with a positive optical power, a second lens with an optical power, a third lens with an optical power, a fourth lens with a positive optical power, and a fifth lens with a negative optical power, wherein the signs of the optical power values of the second lens and the third lens are opposite; each of the first lens to the fifth lens has at least one object side facing the object side and one image side facing the imaging surface side, and there is an air gap between adjacent two lenses; the plurality of spacer elements include a third spacer element and a fourth spacer element; the third spacer element is disposed between the third lens and the fourth lens and is in contact with the image side of the third lens; the fourth spacer element is disposed between the fourth lens and the fifth lens and is in contact with the image side of the fourth lens; the effective focal length f of the optical imaging lens and the combined focal length f23 of the second lens and the third lens satisfy: -3.90 < f23 / f < -1.00; the inner diameter d3s of the object side of the third spacer element perpendicular to the plane of the optical axis and the spacing distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element in the optical axis direction satisfy: 1.45 < d3s / EP34 < 2.60.

[0007] In some embodiments, the spacing distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element in the optical axis direction, and the air spacing T34 between the third lens and the fourth lens on the optical axis satisfy: 0.85 < EP34 / T34 < 1.00.

[0008] In some embodiments, the plurality of spacer elements include a first auxiliary spacer element; the first auxiliary spacer element is disposed between the third spacer element and the fourth lens and is in contact with the image side of the third spacer element; the inner diameter d3bs of the object side of the first auxiliary spacer element perpendicular to the plane of the optical axis and the radius of curvature R6 of the image side of the third lens satisfy: 0.90 < R / d3bs < 1.70.

[0009] In some embodiments, the spacing distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element in the optical axis direction, and the maximum thickness CP3b of the first auxiliary spacer element in the optical axis direction satisfy: 1.30 < EP34 / CP3b < 2.45.

[0010] In some embodiments, the spacing EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis, the maximum thickness CP3b of the first auxiliary spacer along the optical axis, and the center thickness CT4 of the fourth lens along the optical axis satisfy the following: 0.90 < (EP34 - CT4) / CP3b < 2.10.

[0011] In some embodiments, the plurality of spacers includes a second spacer; the spacing EP23 between the image-side surface of the second spacer and the object-side surface of the third spacer along the optical axis, and the center thickness CT3 of the third lens along the optical axis, satisfy: 1.40 <EP23 / CT3<2.35。

[0012] In some embodiments, the plurality of spacers includes a first 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 spacing distance EP12 between the image side of the first spacer and the object side of the second spacer in the optical axis direction satisfy: 8.70 < |R3 + R4| / EP12 < 36.75.

[0013] In some embodiments, the combined focal length f45 of the fourth and fifth lenses, and the maximum horizontal distance L from the object-side end face to the image-side end face of the lens barrel along the optical axis satisfy: -7.05 <f45 / L<-1.55。

[0014] In some embodiments, the effective focal length f2 of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy the following relationship: -1.00 <f2 / R4<2.55。

[0015] In some embodiments, the inner diameter d3m of the plane perpendicular to the optical axis of the image side of the third spacer element, the outer diameter D3m of the plane perpendicular to the optical axis of the image side of the third spacer element, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy the following: 0.45 < (D3m - d3m) / T34 < 1.20.

[0016] In some embodiments, the radius of curvature R6 of the image-side surface of the third lens, the inner diameter d3s of the object-side surface of the third spacer element perpendicular to the optical axis, and the outer diameter D3s of the object-side surface of the third spacer element perpendicular to the optical axis satisfy the following relationship: 2.20 <R6 / (D3s-d3s)<4.95。

[0017] In some embodiments, the outer diameter D4s of the plane perpendicular to the optical axis of the object side of the fourth spacer element and the center thickness CT4 of the fourth lens on the optical axis satisfy the following: 9.65 <D4s / CT4<11.30。

[0018] In some embodiments, the inner diameter d1s of the object side surface of the first spacer element perpendicular to the optical axis, the inner diameter d0s of the object side end face of the lens barrel perpendicular to the optical axis, and the spacing distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer element in the direction along the optical axis satisfy the following: 1.05 < (d0s - d1s) / EP01 < 1.25.

[0019] In some embodiments, the plurality of spacers includes a second auxiliary spacer positioned between the first auxiliary spacer and the fourth lens, and in contact with the object-side surface of the fourth lens; the inner diameter d3m of the image-side surface of the third spacer perpendicular to the optical axis, the inner diameter d3em of the image-side surface of the second auxiliary spacer perpendicular to the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 2.50 <T34 / (d3m-d3em)<3.40。

[0020] In some embodiments, the spacing EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element along the optical axis, and the axial distance SAG32 between the intersection of the image-side surface of the third lens and the optical axis and the vertex of the effective radius of the image-side surface of the third lens, satisfy: 2.30 <EP23 / SAG32<6.20。

[0021] In some embodiments, the distance EP12 between the image-side surface of the first spacer element and the object-side surface of the second spacer element along the optical axis, and the center thickness CT2 of the second lens, satisfy: 0.85 <EP12 / CT2<2.05。

[0022] The optical imaging lens described above uses a five-lens combination with a specific optical power distribution to form a telephoto lens. The ratio of the combined focal length f23 of the second and third lenses to the effective focal length f of the optical imaging lens is limited to the range of -3.90 to -1.00. This design meets the telephoto characteristics of the lens. However, this design creates a large gap between the third and fourth lenses, increasing the risk of stray light returning between them. To address this, this application provides a third and a fourth spacer element between the third and fourth lenses, and between the fourth and fifth lenses, respectively. The ratio of the inner diameter d3s of the third spacer element to the spacing distance EP34 is constrained to the range of 1.45 to 2.60. This effectively reduces light reflection between the third and fourth lenses, thereby suppressing stray light and improving image quality. Attached Figure Description

[0023] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, and the same or corresponding reference numerals denote the same or corresponding parts, wherein: Figure 1 An exemplary dimensioning diagram of an optical imaging lens according to an embodiment of this application is shown; Figure 2 An exemplary structural diagram of an optical imaging lens according to an embodiment of this application is shown; Figure 3a and 3b The diagram shows a stray light path and a spot pattern that satisfy f23 / f=-3.88 and d3s / EP34=1.38 according to an embodiment of this application. Figure 4a and 4b The diagram shows a stray light path and a spot pattern that satisfy f23 / f=-3.88 and d3s / EP34=1.46 according to an embodiment of this application. Figure 5a and 5b The diagram shows a stray light path and spot pattern that satisfy f23 / f=-1.03 and d3s / EP34=2.99 according to an embodiment of this application. Figure 6a and 6b The diagram shows a stray light path and a spot pattern that satisfy f23 / f=-1.03 and d3s / EP34=2.55 according to an embodiment of this application. Figure 7 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-1 of this application is shown; Figure 8A schematic diagram of the structure of the optical imaging lens of Embodiments 1-2 of this application is shown; Figure 9 A schematic diagram of the structure of the optical imaging lens of Embodiments 1-3 of this application is shown; Figure 10 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 of this application is shown; Figure 11 The astigmatism curve of the optical imaging lens of Embodiment 1 of this application is shown; Figure 12 The distortion curve of the optical imaging lens of Embodiment 1 of this application is shown; Figure 13 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 of this application is shown; Figure 14 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-1 of this application is shown; Figure 15 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-2 of this application is shown; Figure 16 A schematic diagram of the structure of the optical imaging lens of Embodiments 2-3 of this application is shown; Figure 17 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 of this application is shown; Figure 18 The astigmatism curve of the optical imaging lens of Embodiment 2 of this application is shown; Figure 19 The distortion curve of the optical imaging lens of Embodiment 2 of this application is shown; Figure 20 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 of this application is shown; Figure 21 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-1 of this application is shown; Figure 22 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-2 of this application is shown; Figure 23 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-3 of this application is shown; Figure 24 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 of this application is shown; Figure 25 The astigmatism curve of the optical imaging lens of Embodiment 3 of this application is shown; Figure 26 The distortion curve of the optical imaging lens of Embodiment 3 of this application is shown; Figure 27The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 of this application is shown. Detailed Implementation

[0024] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] It should be understood that the terms "comprising" and "including" used in the specification and claims of this application indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0026] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0027] 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.

[0028] In this application, 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 application.

[0029] 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 feature.

[0030] In the accompanying drawings, for ease of illustration, the thickness, size, and shape of the lenses (hereinafter referred to as lens elements) have been slightly exaggerated. 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.

[0031] In this specification, 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 surface shape in the paraxial region can be determined according to the judgment method commonly known in the art, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of 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.

[0032] In this application, the object side refers to the side of the optical imaging lens facing the object being photographed (not shown in the figure), and the image side refers to the side of the optical imaging lens facing the imaging plane. In the following text, the object side of the lens refers to the surface of the lens facing the object being photographed (not shown in the figure), and the image side of the lens refers to the surface of the lens facing the imaging plane. In the structural schematic diagram shown in this application, the left side is the object side, and the right side is the image side.

[0033] For ease of understanding, let's first combine... Figure 1 and Figure 2 The lens, its object-side surface and image-side surface, and some dimensions of the optical imaging lens (hereinafter referred to as the optical system) of this application are described in detail to provide a clear and intuitive understanding of the meaning of these surfaces and dimensions. For ease of description, the surface shape of each lens in the optical imaging lens will be described in specific embodiments later, and these parameters will not be shown here.

[0034] like Figure 1 As shown, EP01 is the distance between the object-side end face of the lens barrel and the object-side face of the first spacer element along the optical axis; EP12 is the distance between the image-side face of the first spacer element and the object-side face of the second spacer element along the optical axis; EP23 is the distance between the image-side face of the second spacer element and the object-side face of the third spacer element along the optical axis; and EP34 is the distance between the image-side face of the third spacer element and the object-side face of the fourth spacer element along the optical axis.

[0035] d0s is the inner diameter of the object-side end face of the lens barrel in a plane perpendicular to the optical axis; d1s is the inner diameter of the object-side surface of the first spacer element in a plane perpendicular to the optical axis; d3s is the inner diameter of the object-side surface of the third spacer element in a plane perpendicular to the optical axis. D3s is the outer diameter of the object-side surface of the third spacer element perpendicular to the optical axis in the plane; D4s is the outer diameter of the object-side surface of the fourth spacer element perpendicular to the optical axis in the plane; d3bs is the inner diameter of the object-side surface of the first auxiliary spacer element perpendicular to the optical axis in the plane; d3em is the inner diameter of the image-side surface of the second auxiliary spacer element perpendicular to the optical axis in the plane; d3m is the inner diameter of the image-side surface of the third spacer element perpendicular to the optical axis in the plane; D3m is the outer diameter of the image-side surface of the third spacer element perpendicular to the optical axis in the plane. CP3b is the maximum thickness of the first auxiliary spacer element along the optical axis; SAG32 is the axial distance between the intersection of the image-side surface of the third lens and the optical axis and the vertex of the effective radius of the image-side surface of the third lens; L is the maximum horizontal distance along the optical axis from the object-side end face of the lens barrel to its image-side end face.

[0036] like Figure 2 As shown, E1 is the first lens, E2 is the second lens, E3 is the third lens, E4 is the fourth lens, and E5 is the fifth lens; S1 is the object-side surface of the first lens, S2 is the image-side surface of the first lens, S3 is the object-side surface of the second lens, S4 is the image-side surface of the second lens, S5 is the object-side surface of the third lens, S6 is the image-side surface of the third lens, S7 is the object-side surface of the fourth lens, S8 is the image-side surface of the fourth lens, S9 is the object-side surface of the fifth lens, S10 is the image-side surface of the fifth lens, S11 can be the object-side surface of a filter or protective glass, S12 can be the image-side surface of a filter or protective glass, and S13 is the imaging surface.

[0037] It should be noted that embodiments of this application may also include those without bonding. Figure 1 Other dimensions described will not be repeated here. Furthermore, the optical axis mentioned above and below specifically refers to the central axis of symmetry of the optical imaging lens, around which all lenses are arranged coaxially. The axial distance mentioned above and below refers to the direction of the optical axis of the optical imaging lens, the straight-line distance between two optical surfaces (or structural features).

[0038] Next, the optical imaging lens provided in this application will be described in detail. The optical imaging lens includes a lens barrel and a lens group and a plurality of spacer elements disposed in the lens barrel.

[0039] The microscope tube includes an object-side end face, an image-side end face, an outer ring surface, and an inner ring surface, with the inner ring surface being stepped.

[0040] The lens group consists of five lenses. The five lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a positive optical power, a second lens with a positive or negative optical power, a third lens with a positive or negative optical power, a fourth lens with a positive optical power, and a fifth lens with a negative optical power. Among them, the signs of the optical power values of the second lens and the third lens are opposite; each of the first lens to the fifth lens has at least one object side facing the object and one image side facing the imaging surface, and there is an air gap between adjacent two lenses.

[0041] The plurality of spacer elements include a third spacer element and a fourth spacer element. The third spacer element is disposed between the third lens and the fourth lens and is at least partially in contact with the image side of the third lens, and the fourth spacer element is disposed between the fourth lens and the fifth lens and is at least partially in contact with the image side of the fourth lens.

[0042] The effective focal length f of the optical imaging lens and the combined focal length f23 of the second lens and the third lens satisfy: -3.90 < f23 / f < -1.00; the inner diameter d3s of the object side of the third spacer element perpendicular to the plane of the optical axis and the spacing distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element in the direction along the optical axis satisfy: 1.45 < d3s / EP34 < 2.60.

[0043] In one example, Figure 3a and 3b to Figure 6a and 6b respectively show the stray light schematic diagrams of the optical imaging lens when the conditional formula d3s / EP34 takes values of 1.38, 1.46, 2.99, and 2.55 respectively under the condition that the conditional formula f23 / f of the optical imaging lens satisfies the range of -3.90 to -1.00.

[0044] Light rays Figure 3a and light spots Figure 3bIt shows that the value of f23 / f is -3.88 and the value of d3s / EP34 is 1.38. That is, when d3s / EP34 exceeds the lower limit of the range (1.45, 2.60), the interval distance between the image side of the third spacer element and the object side of the fourth spacer element in the optical axis direction increases correspondingly, and the space between the third lens and the fourth lens increases. At this time, after the light passes through the third spacer element, multiple internal reflections will occur on the surface of the fourth lens, generating stray light interference. Verified by optical simulation tests, the maximum energy value of the light spot formed by such stray light can reach 1.07E-07, and the light spot converges significantly on the opposite side of the light source, presenting an arc-shaped and foggy stray light phenomenon, seriously affecting the imaging clarity and picture purity. The quality risk level of the optical imaging lens in this state is relatively high, resulting in the performance of the optical imaging lens being judged as unqualified (NG).

[0045] Light Figure 4a and light spot Figure 4b It shows that the value of f23 / f is -3.88 and the value of d3s / EP34 is 1.46. That is, when d3s / EP34 is within the range (1.45, 2.60), during the propagation of light in the optical system, mutual reflections will occur on the spacer elements between the third lens and the fourth lens, forming weak stray light. Verified by optical simulation tests, the maximum energy value of the light spot formed by such stray light is 1.87E-08. The energy of this stray light is at a relatively low level, and the simulated light spot is almost invisible. The interference degree of the stray light in this state is within the acceptable range, and the stray light performance of the optical imaging lens is judged as qualified (OK).

[0046] Light Figure 5a and light spot Figure 5b It shows that the value of f23 / f is -1.03 and the value of d3s / EP34 is 2.99. That is, when d3s / EP34 exceeds the upper limit of the range (1.45, 2.60), the optical system will face serious stray light problems. Under these parameter conditions, the increase in the d3s size means that the aperture of the spacer element is relatively large, resulting in a significant decline in its performance as a light-blocking element and being unable to effectively block non-imaging light from entering the optical system. Due to the relatively large aperture of the spacer, when the light passes through the optical system, a single reflection will occur on the inner surface of the third spacer element, generating high-intensity stray light. Optical simulation tests show that the maximum energy of the light spot formed by such stray light can reach 5.93E-06, which is significantly higher compared to the stray light energy standard in the normal operating state of the optical system. The high-intensity stray light will cause an obvious fogging phenomenon in the imaging picture, resulting in a serious decline in image clarity and greatly affecting the user's shooting experience and imaging quality. The stray light generated in this state has exceeded the acceptable range, resulting in the performance of the optical imaging lens being judged as unqualified (NG).

[0047] Light Figure 6a and light spot Figure 6b It shows that when the value of f23 / f is -1.03 and the value of d3s / EP34 is 2.55, that is, when d3s / EP34 is within the range (1.45, 2.60), under this parameter condition, during the propagation of light in the optical system, mutual reflection will occur between the auxiliary spacer element and the lens, forming weak stray light. Through optical simulation test verification, the maximum energy value of the spot formed by such stray light is 3.67E-08. The energy of this stray light is at a relatively low level, and the interference degree of the stray light in this state is within an acceptable range. The stray light performance of the optical imaging lens is determined to be qualified (OK).

[0048] In some embodiments of the present application, the spacing distance EP34 between the image side of the aforementioned third spacer element and the object side of the fourth spacer element in the optical axis direction, and the air spacing T34 between the third lens and the fourth lens on the optical axis satisfy: 0.85 < EP34 / T34 < 1.00.

[0049] Strictly controlling the ratio of EP34 to T34 within the above range can effectively optimize the optical path structure of the optical system, enabling light of different wavelengths to converge better on the imaging plane during propagation. Specifically, within the wavelength range of 486 - 656 nm, this ratio relationship can control the axial chromatic aberration of the telephoto system composed of 5 lenses to be less than 40 μm. The effective control of axial chromatic aberration avoids problems such as imaging blurring and edge color fringes caused by differences in the focusing positions of different color lights, and significantly improves the imaging quality of the optical imaging lens.

[0050] In some embodiments of the present application, the aforementioned multiple spacer elements further include a first auxiliary spacer element, which is placed between the third spacer element and the fourth lens and at least partially contacts the image side of the third spacer element to optimize the optical performance and structural stability. Further, it can be defined that the inner diameter d3bs of the object side of the first auxiliary spacer element perpendicular to the plane of the optical axis and the radius of curvature R6 of the image side of the third lens satisfy: 0.90 < R6 / d3bs < 1.70.

[0051] This ratio constraint is based on ray tracing theory and optical simulation analysis to accurately control the propagation path of the light emitted by the third lens: by reasonably setting the ratio relationship between R6 and d3bs, the height of the light emitted by the third lens can be effectively reduced, and then the incident aperture of the light entering the fourth lens can be reduced. This optimization measure significantly improves the light incident uniformity of the fourth and fifth lenses, avoids aberration problems caused by excessive concentration of local light energy, and improves the overall clarity and color consistency of the imaging picture.

[0052] Furthermore, the combination of multiple spacer elements and specific dimensional ratios enhances the assembly stability of the lens group within the lens barrel, reduces the risk of positional shift during assembly, and improves the overall structural reliability of the optical imaging lens.

[0053] In some embodiments of this application, the spacing EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element along the optical axis, and the maximum thickness CP3b of the first auxiliary spacer element along the optical axis, satisfy: 1.30 <EP34 / CP3b<2.45。

[0054] This proportional relationship optimizes the stress distribution of the lens in the lens system, ensuring that the lens maintains a stable geometric shape and positional accuracy when subjected to external mechanical stress (such as assembly stress, vibration stress, etc.), avoiding problems such as lens deformation and displacement caused by stress concentration, and significantly improving the structural reliability and durability of the lens.

[0055] From an optical performance perspective, by precisely controlling the ratio of the lens edge distance (i.e., EP34) to the maximum thickness of the first auxiliary spacer element, the refraction and propagation angles of light between the lens groups can be effectively adjusted, reducing light reflection and scattering and suppressing the generation of stray light.

[0056] In some embodiments of this application, the spacing distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis, the maximum thickness CP3b of the first auxiliary spacer element along the optical axis, and the center thickness CT4 of the fourth lens on the optical axis satisfy the following: 0.90 < (EP34 - CT4) / CP3b < 2.10.

[0057] This proportional relationship effectively optimizes the overall lens layout by precisely controlling the difference between the center thickness of the fourth lens and the distance to the lens edge, as well as the ratio of this difference to the maximum thickness of the first auxiliary spacer element. Specifically, by reasonably constraining the ratio of (EP34-CT4) / CP3b, the spacing between the third and fourth lenses in the structural region is optimized, making the spatial arrangement between the third and fourth lenses more compact and helping to reduce the overall size of the lens.

[0058] In some embodiments of this application, the aforementioned plurality of spacers further includes a second spacer element disposed between the second lens and the third lens, and at least partially in contact with the image-side surface of the second lens. Further, the spacing distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element along the optical axis, and the center thickness CT3 of the third lens along the optical axis, satisfy: 1.40 <EP23 / CT3<2.35。

[0059] The ratio of the optical axis spacing distance EP23 between the image side of the second spacer element and the object side of the third spacer element and the center thickness CT3 of the third lens is constrained to be within the above range. At this time, the spacing distance EP23 is slightly larger than the center thickness CT3 of the third lens, which helps to improve the assembly stability of the third lens. It also reduces the optical axis spacing distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element, thereby reducing the risk of internal stray light between the third and fourth lenses.

[0060] In some embodiments of this application, the aforementioned plurality of spacers further includes a first spacer element, which is placed between the first lens and the second lens and is at least partially in contact with the image-side surface of the first lens; further, 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 distance EP12 between the image-side surface of the first spacer element and the object-side surface of the second spacer element along the optical axis satisfy: 8.70 < |R3 + R4| / EP12 < 36.75.

[0061] From a structural design perspective, by limiting the range of |R3 + R4| / EP12, sufficient and reasonable space can be ensured between the first and second lenses to accommodate the installation requirements of the first and second spacer elements. This not only meets the optical system's precision requirements for lens spacing but also guarantees the mechanical strength and assembly feasibility of the spacer elements, effectively avoiding component interference due to insufficient spacing or structural loosening caused by excessive spacing, thus enhancing the overall structural stability of the lens.

[0062] From an optical design perspective, this ratio, by precisely constraining the curvature radius parameter of the second lens, effectively ensures that the second lens maintains its positive optical power characteristics, allowing it to fully perform its core function of converging light. A reasonable |R3+R4| / EP12 ratio can optimize the refraction angle and converging efficiency of the second lens for incident light, reduce light divergence loss, and thus improve image quality.

[0063] In some embodiments of this application, the combined focal length f45 of the fourth and fifth lenses, and the maximum horizontal distance L from the object-side end face to the image-side end face of the lens barrel along the optical axis satisfy: -7.05 <f45 / L<-1.55。

[0064] By limiting the ratio of f45 to L within a specific range, it is possible to achieve reasonable control of the lens barrel axial dimension while ensuring the optical performance of the lens, thus meeting the miniaturization requirements of the optical system.

[0065] In some embodiments of this application, the effective focal length f2 of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy the following relationship: -1.00 <f2 / R4<2.55。

[0066] This proportional relationship limits the ratio of the effective focal length f2 of the second lens to the radius of curvature R4 of the image side surface of the second lens within the range of -1.00 to 2.55. In design scenarios where the absolute values ​​of both the effective focal length f2 and the radius of curvature R4 of the image side surface of the second lens are relatively large, the light divergence capability of the second lens can be controlled, providing key support for the realization of the overall telephoto characteristics of the optical imaging lens and increasing the effective focal length of the system.

[0067] In some embodiments of this application, the inner diameter d3m of the plane perpendicular to the optical axis of the image side of the third spacer element, the outer diameter D3m of the plane perpendicular to the optical axis of the image side of the third spacer element, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy the following: 0.45 < (D3m - d3m) / T34 < 1.20.

[0068] This proportional relationship, by limiting the ratio of the difference between the outer diameter D3m and the inner diameter d3m of the third spacer element (perpendicular to the optical axis plane) to the air gap T34 between the third and fourth lenses on the optical axis, within the range of 0.45 to 1.20, ensures the mechanical strength and support rigidity of the third spacer element as a key supporting component between the third and fourth lenses, based on the wall thickness determined by (D3m-d3m). This allows it to maintain a stable geometric shape when subjected to lens assembly stress, vibration, and impact, preventing the third or fourth lens from shifting or deforming due to insufficient support, thus ensuring the reliability of the lens's local structure. Furthermore, by utilizing the light interception and guidance effect of the inner diameter d3m of the third spacer element's image-side surface, combined with the synergistic matching of the outer diameter D3m and the air gap T34, the propagation angle and reflection path of light between the third and fourth lenses can be controlled. This reduces abnormal reflection and scattering of light on the surface of the third spacer element, thereby suppressing stray light generation. This improves structural stability while optimizing optical propagation effects, ensuring the lens's imaging quality.

[0069] In some embodiments of this application, the radius of curvature R6 of the image-side surface of the third lens, the inner diameter d3s of the object-side surface of the third spacer perpendicular to the optical axis, and the outer diameter D3s of the object-side surface of the third spacer perpendicular to the optical axis satisfy the following relationship: 2.20 <R6 / (D3s-d3s)<4.95。

[0070] The radius of curvature R6 of the image-side surface of the third lens determines the angle of refraction and the degree of convergence of light. The difference between the outer diameter D3s and the inner diameter d3s of the object-side surface of the third spacer element (D3s-d3s) constitutes a key dimension of the aperture-like structure in the optical system, directly controlling the incident aperture and angular range of light. By limiting this ratio within a reasonable range, the incident angle of light can be effectively constrained, avoiding aberrations caused by excessively large incident angles. This ensures that light of different wavelengths converges better on the imaging plane during propagation, significantly improving image quality.

[0071] In addition, a reasonable value for R6 / (D3s-d3s) can optimize the size matching relationship between the third lens and the third spacer element while ensuring optical performance, avoid the increase in lens axial length or space redundancy caused by excessive element size, and ensure the compactness of the optical system.

[0072] In some embodiments of this application, the outer diameter D4s of the plane perpendicular to the optical axis of the object side of the fourth spacer element and the center thickness CT4 of the fourth lens on the optical axis satisfy the following: 9.65 <D4s / CT4<11.30。

[0073] As a key component supporting the fourth and fifth lenses, the fourth spacer element's outer diameter D4s determines its compatibility and support strength with the lens barrel and its preceding and following optical elements, while the center thickness CT4 of the fourth lens affects the lens's mechanical rigidity. Properly controlling the D4s / CT4 ratio ensures that the fourth spacer element provides uniform and stable support to the fourth lens, preventing lens deformation and displacement caused by assembly stress or external vibrations. Furthermore, a proper match between the fourth spacer element's outer diameter D4s and the fourth lens's center thickness CT4 effectively controls the incident angle and light distribution at the fourth lens, reducing reflection and scattering on the surface of the fourth lens and the fourth spacer element, thereby optimizing the light propagation path.

[0074] In some embodiments of this application, at least one of the third and fourth lenses has an Abbe number of less than 25. The Abbe number is a core indicator for measuring the dispersion of optical materials; a smaller number indicates a stronger ability of the material to disperse light of different wavelengths. When the third or fourth lens uses a high-dispersion material with an Abbe number of less than 25, it forms complementary dispersion characteristics with other lenses in the lens group, allowing for targeted adjustment of the propagation path of light in specific wavelength bands. During light propagation, the high-dispersion lens can produce stronger refraction differences for long-wavelength or short-wavelength light, working synergistically with other lenses to effectively balance the convergence points of light of different wavelengths, reducing on-axis chromatic aberration and magnification chromatic aberration. This differentiated dispersion compensation design can reduce the impact of dispersion on image quality.

[0075] In some embodiments of this application, the inner diameter d1s of the object side surface of the first spacer element perpendicular to the optical axis, the inner diameter d0s of the object side end face of the lens barrel perpendicular to the optical axis, and the spacing distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer element in the direction along the optical axis satisfy the following: 1.05 < (d0s - d1s) / EP01 < 1.25.

[0076] The difference between the inner diameter d0s of the object-side end face of the lens barrel and the inner diameter d1s of the object-side end face of the first spacer element (d0s-d1s) essentially constitutes the light constraint structure at the front of the lens. Its dimensional variation affects the incident aperture and angular distribution of light. The EP01 spacing distance determines the propagation path length of light within this constraint structure. When the relationship between these three factors is within a reasonable range, edge truncation or excessive scattering of light due to excessive incident angles can be effectively avoided, while suppressing light energy loss caused by abrupt changes in aperture. By controlling the numerical range of this conditional expression, light can enter the lens group in a more uniform and stable state, ensuring uniform optical propagation within the lens barrel.

[0077] In some embodiments of this application, the aforementioned plurality of spacers further includes a second auxiliary spacer element, which is disposed between the first auxiliary spacer element and the fourth lens, and at least partially contacts the image-side surface of the first auxiliary spacer element. Further, the inner diameter d3m of the plane perpendicular to the optical axis of the image-side surface of the third spacer element, the inner diameter d3em of the plane perpendicular to the optical axis of the image-side surface of the second auxiliary spacer element, and the air gap T34 between the third and fourth lenses on the optical axis satisfy: 2.50 <T34 / (d3m-d3em)<3.40。

[0078] The difference in inner diameter (d3m-d3em) between the third spacer element and the second auxiliary spacer element determines the effective width of the annular support structure formed by their combination. This width directly affects the clamping force and stability of the third and fourth lenses. T34, as the air gap between the third and fourth lenses, has its size and the ratio of its inner diameter difference optimized to ensure that the spacer element forms a uniform and stable mechanical transmission path when subjected to mechanical loads such as lens assembly stress and external vibrations. When this ratio is within a reasonable range, lens shift or deformation due to insufficient support strength of the spacer element can be avoided, ensuring the stability of the lens under mechanical stress.

[0079] In some embodiments of this application, the spacing distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element along the optical axis, and the axial distance SAG32 between the intersection of the image-side surface of the third lens and the optical axis and the vertex of the effective radius of the image-side surface of the third lens, satisfy: 2.30 <EP23 / SAG32<6.20。

[0080] The ratio of EP23 to SAG32 directly affects the propagation characteristics of light between the second and third lenses and the spacer elements. The SAG32 parameter characterizes the curvature of the image-side surface of the third lens, reflecting the trend of the refraction angle of light on that lens surface; while EP23 determines the path length of light propagation between the second and third spacer elements. When the ratio of these two parameters is within a reasonable range, the uniformity of light propagation between the second and third lenses can be ensured, thereby improving image quality.

[0081] In some embodiments of this application, the spacing distance EP12 between the image-side surface of the first spacer element and the object-side surface of the second spacer element along the optical axis, and the center thickness CT2 of the second lens, satisfy the following: 0.85 <EP12 / CT2<2.05。

[0082] The ratio EP12 / CT2, by limiting the ratio of the distance EP12 between the first and second spacers to the center thickness CT2 of the second lens to between 0.85 and 2.05, allows for adjustment of the matching relationship between the spacer distance and the center thickness of the second lens, optimizing the local propagation space between the first and second spacers and the second lens. This optimization effectively avoids unnecessary reflection and scattering losses in the local propagation space between the first and second spacers and the second lens due to improper matching of CT2 and EP12. It ensures that the light incident from the first lens to the second lens can be stably transmitted to subsequent elements such as the third lens, thereby improving the lens imaging quality.

[0083] 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.

[0084] It should be noted that in the following Embodiment 1, there are three examples: Embodiment 1-1, Embodiment 1-2, and Embodiment 1-3; in Embodiment 2, there are three examples: Embodiment 2-1, Embodiment 2-2, and Embodiment 2-3; and in Embodiment 3, there are three examples: Embodiment 3-1, Embodiment 3-2, and Embodiment 3-3.

[0085] In the three examples within the same embodiment, the surface parameters (such as surface type, radius of curvature, thickness, material, and conic coefficient), higher-order coefficients of the aspherical surface (such as A4, A6, A8…A22), and optical parameters (such as effective focal length f, effective focal lengths f1 to f5 of the first to fifth lenses, combined focal length f23 of the second and third lenses, combined focal length f45 of the fourth and fifth lenses, axial distance TD between the object-side surface of the first lens and the image-side surface of the fifth lens, and axial distance SAG32 between the intersection of the image-side surface of the third lens and the optical axis and the vertex of the effective radius of the image-side surface of the third lens) of the optical imaging lens are the same, while the structural parameters of the lens barrel and spacer elements are different. Therefore, in different examples within the same embodiment, and in different examples within different embodiments, the values ​​of each conditional expression are not the same, but all fall within the range of values ​​satisfied by the aforementioned conditional expressions.

[0086] It should be noted that any one of the examples in Embodiments 1 to 3 described below is applicable to all implementations of this application.

[0087] Example 1 like Figures 7 to 13 As shown, the optical imaging lens of Embodiment 1 is described. Figure 7 A schematic diagram of the optical imaging lens of Embodiment 1-1 is shown. Figure 8 The diagram shows the structure of the optical imaging lens in Embodiments 1-2. Figure 9 A schematic diagram of the optical imaging lens of Embodiments 1-3 is shown.

[0088] like Figures 7 to 9 As shown, the optical imaging lens includes a lens barrel P0 and 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 first auxiliary spacer P3b, a second auxiliary spacer P3e, a fourth lens E4, a fourth spacer P4, and a fifth lens E5, which are arranged sequentially along the optical axis from the object side to the image side in the lens barrel P0.

[0089] like Figure 7As shown, in Embodiment 1-1, the first spacer element P1 is located between the first lens E1 and the second lens E2, and contacts the image-side surface S2 of the first lens. The second spacer element P2 is located between the second lens E2 and the third lens E3, and contacts the image-side surface S4 of the second lens. The third spacer element P3 is located between the third lens E3 and the first auxiliary spacer element P3b, and contacts the image-side surface S6 of the third lens. The first auxiliary spacer element P3b is located between the third spacer element P3 and the second auxiliary spacer element P3e. The second auxiliary spacer element P3e is located between the first auxiliary spacer element P3b and the fourth lens, and contacts the object-side surface S7 of the fourth lens. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, and contacts the image-side surface S8 of the fourth lens.

[0090] like Figure 8 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 1-2. The contact method of each spacer element in this embodiment is the same as in Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here. Figure 9 The diagram shown is a structural schematic of the optical imaging lens of Embodiments 1-3. The contact method of each spacer element in this embodiment is the same as that in Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0091] Table 1 below shows the basic structural parameters of the optical imaging lens of Embodiment 1 under Embodiments 1-1, 1-2, and 1-3, where the units for radius of curvature, thickness, and spacing are millimeters (mm). In Tables 1, 3, and 5, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture stop.

[0092] Table 1

[0093] As shown in Table 1, in Embodiment 1, the object-side and image-side surfaces of the first lens E1 are spherical, while the object-side and image-side surfaces of the second lens E2 to the fifth lens E5 are aspherical. Tables 2-1 and 2-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S3-S10 in Embodiment 1.

[0094] Table 2-1

[0095] Table 2-2

[0096] In Embodiment 1, the first lens E1 has positive optical power, the second lens E2 has positive optical power, the third lens E3 has negative optical power, the fourth lens E4 has positive optical power, and the fifth lens E5 has negative optical power. The optical parameters of the optical imaging lens in Embodiment 1 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 7 below (unit: mm), the structural parameters are shown in Table 8 below (unit: mm), and the values ​​of each conditional expression are shown in Table 9 below.

[0097] Figure 10 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 11 The astigmatism curve of the optical imaging lens of Embodiment 1 is shown, which represents the curvature of the meridional and sagittal image planes. Figure 12 The distortion curve of the optical imaging lens of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 13 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0098] Depend on Figures 10 to 13 As can be seen, the on-axis chromatic aberration, astigmatism, distortion, and magnification chromatic aberration are well controlled, and the optical imaging lens given in Example 1 can achieve good imaging quality.

[0099] Example 2 like Figures 14 to 20 As shown, the optical imaging lens of Embodiment 2 is described. Figure 14 A schematic diagram of the optical imaging lens of Embodiment 2-1 is shown. Figure 15 A schematic diagram of the optical imaging lens of Embodiment 2-2 is shown. Figure 16 A schematic diagram of the optical imaging lens of Embodiments 2-3 is shown.

[0100] like Figures 14 to 16 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a first auxiliary spacer element P3b, a fourth lens E4, a fourth spacer element P4 and a fifth lens E5 arranged sequentially along the optical axis from the object side to the image side in the lens barrel P0.

[0101] like Figure 14As shown, in Embodiment 2-1, the first spacer element P1 is located between the first lens E1 and the second lens E2, and contacts the image-side surface S2 of the first lens. The second spacer element P2 is located between the second lens E2 and the third lens E3, and contacts the image-side surface S4 of the second lens. The third spacer element P3 is located between the third lens E3 and the first auxiliary spacer element P3b, and contacts the image-side surface S6 of the third lens. The first auxiliary spacer element P3b is located between the third spacer element P3 and the fourth lens P4, and contacts the object-side surface S7 of the fourth lens. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, and contacts the image-side surface S8 of the fourth lens.

[0102] like Figure 15 The diagram shown is a structural schematic of the optical imaging lens in Embodiment 2-2. The contact method of each spacer element in this embodiment is the same as in Embodiment 2-1, and can be found in the relevant description in Embodiment 2-1; it will not be repeated here. Figure 16 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 2-3. The contact method of each spacer element in this embodiment is the same as that in Embodiment 2-1, and can be referred to the relevant description in Embodiment 2-1, which will not be repeated here.

[0103] Table 3 below shows the basic structural parameters of the optical imaging lens of Embodiment 2, where the units for radius of curvature, thickness, and spacing are all millimeters (mm).

[0104] Table 3

[0105] As shown in Table 3, in Embodiment 2, the object-side and image-side surfaces of the first lens are spherical, while the object-side and image-side surfaces of the second lens E2 to the fifth lens E5 are aspherical. Tables 4-1 and 4-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 that can be used for each aspherical mirror S3-S10 in Embodiment 2.

[0106] Table 4-1

[0107] Table 4-2

[0108] In Embodiment 2, the first lens E1 has positive optical power, the second lens E2 has positive optical power, the third lens E3 has negative optical power, the fourth lens E4 has positive optical power, and the fifth lens E5 has negative optical power. The optical parameters of the optical imaging lens in Embodiment 2 under Embodiments 2-1, 2-2, and 2-3 are shown in Table 7 below (unit: mm), the structural parameters are shown in Table 8 below (unit: mm), and the values ​​of each conditional expression are shown in Table 9 below.

[0109] Figure 17 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 18 The astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the curvature of the meridional and sagittal image planes. Figure 19 The distortion curve of the optical imaging lens of Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 20 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0110] Depend on Figures 17 to 20 As can be seen, the on-axis chromatic aberration, astigmatism, distortion, and magnification chromatic aberration are well controlled, and the optical imaging lens given in Example 2 can achieve good imaging quality.

[0111] Example 3 like Figures 21 to 27 As shown, the optical imaging lens of Embodiment 3 is described. Figure 21 A schematic diagram of the optical imaging lens of Embodiment 3-1 is shown. Figure 22 A schematic diagram of the optical imaging lens of Embodiment 3-2 is shown. Figure 23 A schematic diagram of the optical imaging lens of Embodiment 3-3 is shown.

[0112] like Figures 21 to 23 As shown, the optical imaging lens includes a lens barrel P0 and 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 first auxiliary spacer P3b, a second auxiliary spacer P3e, a fourth lens E4, a fourth spacer P4, and a fifth lens E5, which are arranged sequentially along the optical axis from the object side to the image side in the lens barrel P0.

[0113] like Figure 21As shown, in Embodiment 3-1, the first spacer element P1 is located between the first lens E1 and the second lens E2, and contacts the image-side surface S2 of the first lens. The second spacer element P2 is located between the second lens E2 and the third lens E3, and contacts the image-side surface S4 of the second lens. The third spacer element P3 is located between the third lens E3 and the first auxiliary spacer element P3b, and contacts the image-side surface S6 of the third lens. The first auxiliary spacer element P3b is located between the third spacer element P3 and the second auxiliary spacer element P3e. The second auxiliary spacer element P3e is located between the first auxiliary spacer element P3b and the fourth lens, and contacts the object-side surface S7 of the fourth lens. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, and contacts the image-side surface S8 of the fourth lens.

[0114] like Figure 22 The diagram shown is a structural schematic of the optical imaging lens in Embodiment 3-2. The contact method of each spacer element in this embodiment is the same as in Embodiment 3-1, and can be found in the relevant description in Embodiment 3-1; it will not be repeated here. Figure 23 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 3-3. The contact method of each spacer element in this embodiment is the same as that in Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0115] Table 5 below shows the basic structural parameters of the optical imaging lens of Embodiment 3, where the units for radius of curvature, thickness, and spacing are all millimeters (mm).

[0116] Table 5

[0117] As shown in Table 5, in Embodiment 3, the object-side and image-side surfaces of the first lens are spherical, while the object-side and image-side surfaces of the second lens E2 to the fifth lens E5 are aspherical. Tables 6-1 and 6-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S3-S10 in Embodiment 3.

[0118] Table 6-1

[0119] Table 6-2

[0120] In Embodiment 3, the first lens E1 has positive optical power, the second lens E2 has negative optical power, the third lens E3 has positive optical power, the fourth lens E4 has positive optical power, and the fifth lens E5 has negative optical power. The optical parameters of the optical imaging lens in Embodiment 3 under Embodiments 3-1, 3-2, and 3-3 are shown in Table 7 below (unit: mm), the structural parameters are shown in Table 8 below (unit: mm), and the values ​​of each conditional expression are shown in Table 9 below.

[0121] Figure 24 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 25 The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the curvature of the meridional and sagittal image planes. Figure 26 The distortion curve of the optical imaging lens of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 27 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0122] Depend on Figures 24 to 27 As can be seen, the on-axis chromatic aberration, astigmatism, distortion, and magnification chromatic aberration are well controlled, and the optical imaging lens given in Example 3 can achieve good imaging quality.

[0123] Table 7

[0124] Table 8

[0125] Table 9

[0126] It should be noted that the reason why the values ​​of Examples 2-1, 2-2, and 2-3 are empty (i.e., “ / ”) in the row containing the parameter d3em in Table 8 and the row containing the conditional expression T34 / (d3m-d3em) in Table 9 is that there is no second auxiliary spacer element P3e in the optical imaging lenses of Examples 2-1, 2-2, and 2-3. Therefore, the values ​​of the parameters and conditions related to this element are empty.

[0127] It should be noted that in Table 9, the value of the center thickness CT2 of the second lens is taken from the data in plane S3 of Tables 1, 3, or 5. The value of the center thickness CT3 of the third lens is taken from the data in plane S5 of Tables 1, 3, or 5. The value of the center thickness CT4 of the fourth lens is taken from the data in plane S7 of Tables 1, 3, or 5.

[0128] 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.

[0129] While numerous embodiments of this application have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will arise for those skilled in the art without departing from the spirit and intent of this application. It should be understood that various alternatives to the embodiments of this application described herein may be employed in the practice of this application. The appended claims are intended to define the scope of protection of this application and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. An optical imaging lens, comprising a lens barrel and a lens group and a plurality of spacer elements disposed in the lens barrel; The lens barrel includes an object-side end face, an image-side end face, an outer ring surface, and an inner ring surface, wherein the inner ring surface is stepped. The lens set is composed of five lenses, the five lenses are, in order from the object side to the image side, a first lens having positive refractive power, a second lens having refractive power, a third lens having refractive power, a fourth lens having positive refractive power, and a fifth lens having negative refractive power, wherein, The optical power values ​​of the second lens and the third lens have opposite signs; Each of the first to fifth lenses has at least one object-side surface facing the subject and one image-side surface facing the imaging plane, and there is an air gap between adjacent lenses; the plurality of spacers includes a third spacer and a fourth spacer; the third spacer is placed between the third and fourth lenses and contacts the image-side surface of the third lens; the fourth spacer is placed between the fourth and fifth lenses and contacts the image-side surface of the fourth lens; The first lens has a convex object-side surface, the second lens has a concave image-side surface, the third lens has a concave image-side surface, and the fourth lens has a convex image-side surface. The plurality of spacers further includes a first auxiliary spacer and a second auxiliary spacer; the first auxiliary spacer is disposed between the third spacer and the fourth lens and is in contact with the image side of the third spacer; the second auxiliary spacer is disposed between the first auxiliary spacer and the fourth lens and is in contact with the object side of the fourth lens. The effective focal length f of the optical imaging lens and the combined focal length f23 of the second lens and the third lens satisfy the following condition: -3.90 <f23 / f<-1.00; The inner diameter d3s of the object-side surface of the third spacer element perpendicular to the optical axis, and the spacing EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element along the optical axis satisfy: 1.45 <d3s / EP34<2.60; The image-side surface of the third spacer element and the object-side surface of the fourth spacer element are spaced EP34 along the optical axis, and the air gap T34 between the third lens and the fourth lens along the optical axis satisfies: 0.85 <EP34 / T34<1.00; The distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element along the optical axis, and the maximum thickness CP3b of the first auxiliary spacer element along the optical axis, satisfy the following: 1.30 <EP34 / CP3b<2.45; The inner diameter d3m of the image-side plane of the third spacer element perpendicular to the optical axis, the inner diameter d3em of the image-side plane of the second auxiliary spacer element perpendicular to the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 2.50 <T34 / (d3m-d3em)<3.40。 2. The optical imaging lens according to claim 1, characterized in that, The inner diameter d3bs of the plane perpendicular to the optical axis on the object side of the first auxiliary spacer element and the radius of curvature R6 of the image side of the third lens satisfy the following relationship: 0.90 <R6 / d3bs<1.70。 3. The optical imaging lens according to claim 2, characterized in that, The following conditions must be met: the distance EP34 between the image side of the third spacer and the object side of the fourth spacer along the optical axis, the maximum thickness CP3b of the first auxiliary spacer along the optical axis, and the center thickness CT4 of the fourth lens along the optical axis: 0.90 < (EP34 - CT4) / CP3b < 2.

10.

4. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements includes a second spacer element; The distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element along the optical axis, and the center thickness CT3 of the third lens along the optical axis, satisfy: 1.40 <EP23 / CT3<2.35。 5. The optical imaging lens according to claim 4, characterized in that, The plurality of spacer elements includes a first spacer element; 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 spacing distance EP12 between the image side of the first spacer element and the object side of the second spacer element along the optical axis satisfy: 8.70 < |R3 + R4| / EP12 < 36.

75.

6. The optical imaging lens according to claim 1, characterized in that, The combined focal length f45 of the fourth and fifth lenses, and the maximum horizontal distance L from the object-side end face to the image-side end face of the lens barrel along the optical axis satisfy the following condition: -7.

05. <f45 / L<-1.55。 7. The optical imaging lens according to claim 1, characterized in that, The effective focal length f2 of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy the following relationship: -1.00 <f2 / R4<2.55。 8. The optical imaging lens according to claim 1, characterized in that, The inner diameter d3m of the plane perpendicular to the optical axis of the image side of the third spacer element, the outer diameter D3m of the plane perpendicular to the optical axis of the image side of the third spacer element, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy the following condition: 0.45 < (D3m - d3m) / T34 < 1.

20.

9. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R6 of the image-side surface of the third lens, the inner diameter d3s of the object-side surface of the third spacer element perpendicular to the optical axis, and the outer diameter D3s of the object-side surface of the third spacer element perpendicular to the optical axis satisfy the following condition: 2.20 <R6 / (D3s-d3s)<4.95。 10. The optical imaging lens according to claim 1, characterized in that, The outer diameter D4s of the plane perpendicular to the optical axis of the object side of the fourth spacer element, and the center thickness CT4 of the fourth lens on the optical axis satisfy the following relationship: 9.65 <D4s / CT4<11.30。 11. The optical imaging lens according to claim 5, characterized in that, The inner diameter d1s of the object side surface of the first spacer element perpendicular to the optical axis, the inner diameter d0s of the object side end face of the lens barrel perpendicular to the optical axis, and the spacing distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer element along the optical axis direction satisfy: 1.05 < (d0s - d1s) / EP01 < 1.

25.

12. The optical imaging lens according to claim 4, characterized in that, The spacing EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element along the optical axis, and the axial distance SAG32 between the intersection of the image-side surface of the third lens and the optical axis and the vertex of the effective radius of the image-side surface of the third lens, satisfy the following condition: 2.30 <EP23 / SAG32<6.20。 13. The optical imaging lens according to claim 5, characterized in that, The distance EP12 between the image-side surface of the first spacer element and the object-side surface of the second spacer element along the optical axis, and the center thickness CT2 of the second lens, satisfy the following: 0.85 <EP12 / CT2。

Images