Imaging lens

Abstract

The utility model provides an imaging lens. The imaging lens comprises a lens barrel, a lens group and a spacing element group, the lens group and the spacing element group are arranged in the lens barrel, the lens barrel is provided with an object-side end face, an image-side end face and an inclined plane, the inclined plane is located at the object-side end of the lens barrel, and the edge, closest to an optical axis, of the inclined plane is located on the minimum aperture of the lens barrel; the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, and the maximum outer diameters of the first lens to the sixth lens are gradually increased from the object side to the image side; the spacing element group comprises a first spacing element and a second spacing element; the following conditions are satisfied: 2.40 lt; eP01 / CT1lt, EP01 / CT1lt; 2.95, 2.95; 0.40 lt, 0.40 lt; eP01 / d0slt, EP01 / d0slt 0.60, 0.60; 1.15 lt, 1.15 lt; (D1m-d1s) / d2slt, (D1m-d1s And 2.00. According to the utility model, the problem of poor image definition and contrast caused by light loss of an imaging lens in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical imaging equipment, and in particular to an imaging lens. Background Art

[0002] With the continuous advancement of technology, consumer electronics are rapidly developing towards intelligence and portability. Smartphones are a prime example of this trend, and improving the image quality of their imaging lenses has become a common focus for consumers and manufacturers. However, to meet user demands for thinner, lighter, and more portable devices, the overall design of smartphone imaging lenses faces a series of challenges.

[0003] First, the size and weight of the imaging lens are strictly limited, which directly impacts its optical performance. This also tends to restrict the front wall thickness and object-side inner diameter of the imaging lens, limiting the angle of incidence and the amount of light passing through. Second, the light entering the lens barrel is limited by the aperture diaphragm of the spacer element, whose size requires careful design. If the aperture is too large, light scattering may occur; if the aperture is too small, the amount of light entering the lens is reduced. Therefore, spacers that are too large or too small will affect image clarity, brightness, and contrast.

[0004] That is to say, the imaging lens in the prior art has the problem of light loss resulting in poor image clarity and contrast. Utility Model Content

[0005] The main purpose of the utility model is to provide an imaging lens to solve the problem of poor image clarity and contrast caused by light loss in imaging lenses in the prior art.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided an imaging lens, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens barrel has an object-side end face, an image-side end face and an inclined surface. The inclined surface is located at the object-side end of the lens barrel. One side of the inclined surface is connected to the object-side end face, and the other side of the inclined surface extends in a direction close to the optical axis of the lens barrel. The edge of the inclined surface closest to the optical axis is at the minimum aperture of the lens barrel; the lens group is composed of six lenses. The six lenses sequentially include a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side. The maximum outer diameters of the first lens to the sixth lens gradually increase from the object side to the image side. The object-side surface of the first lens is located on the image side of the connection position between the inclined surface and the object-side end face; the spacer element group includes a first spacer element disposed on the image side of the first lens and partially contacting the image-side surface of the first lens, and a second spacer element disposed on the image side of the second lens and partially contacting the image-side surface of the second lens; the distance EP01 along the optical axis direction from the object-side end face of the lens barrel to the object-side surface of the first spacer element and the center thickness CT1 of the first lens satisfy: 2.40 < EP01 / CT1 < 2.95; EP01 and the object-side inner diameter d0s of the lens barrel satisfy: 0.40 < EP01 / d0s < 0.60; the image-side outer diameter D1m of the first spacer element, the object-side inner diameter d1s of the first spacer element and the object-side inner diameter d2s of the second spacer element satisfy: 1.15 < (D1m - d1s) / d2s < 2.00.

[0007] According to another aspect of the present invention, an imaging lens is also provided, comprising a lens barrel and a lens group and a spacer element group arranged in the lens barrel, the lens barrel having an object-side end face, an image-side end face and an inclined surface, the inclined surface being located at the object-side end of the lens barrel, one side of the inclined surface being connected to the object-side end face, the other side of the inclined surface extending toward the direction close to the optical axis of the lens barrel, and the edge of the inclined surface closest to the optical axis being located at the minimum aperture of the lens barrel; the lens group being composed of six lenses, the six lenses comprising, in order from the object side to the image side, a first lens having negative focal power, a second lens having positive focal power, a third lens having negative focal power, a fourth lens having focal power, a fifth lens having positive focal power and a sixth lens having negative focal power, the object-side face of the first lens being concave, and the image-side face being concave; the object-side face of the second lens being convex The object side surface of the first lens is convex, and the image side surface is convex; the object side surface of the third lens is convex, and the image side surface is concave; the object side surface of the fourth lens is convex, and the image side surface is concave; the object side surface of the fifth lens is convex, and the image side surface is convex; the object side surface of the sixth lens is convex, and the image side surface is concave; the maximum outer diameters of the first to sixth lenses gradually increase from the object side to the image side, and the object side surface of the first lens is located on the image side of the connecting position of the inclined surface and the object side end surface; the spacer element group includes a first spacer element arranged on the image side of the first lens and in partial contact with the image side surface of the first lens, and a second spacer element arranged on the image side of the second lens and in partial contact with the image side surface of the second lens; the effective focal length f1 of the first lens, the effective focal length f of the imaging lens and the object side outer diameter D1s of the first spacer element satisfy: -0.40mm -1 <f1 / f / D1s<-0.20mm -1 The effective focal length f2 of the second lens, the spacing distance EP12 from the image side of the first spacer element to the object side of the second spacer element along the optical axis and the image side outer diameter D1m of the first spacer element satisfy: 0.40mm -1 <f2 / EP12 / D1m<0.65mm -1 .

[0008] According to another aspect of the present invention, an imaging lens is provided, comprising a lens barrel and a lens group and a spacer element group arranged in the lens barrel, wherein the lens barrel has an object-side end face, an image-side end face and an inclined surface, wherein the inclined surface is located at the object-side end of the lens barrel, one side of the inclined surface is connected to the object-side end face, and the other side of the inclined surface extends toward the direction close to the optical axis of the lens barrel, and the edge of the inclined surface closest to the optical axis is located at the minimum aperture of the lens barrel; the lens group is composed of six lenses, and the six lenses include, in order from the object side to the image side, a first lens with negative optical power, a second lens with positive optical power, a third lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive ... a fourth lens having a positive optical power, a fifth lens having a positive optical power, and a sixth lens having a negative optical power; the maximum outer diameters of the first to sixth lenses gradually increase from the object side to the image side, and the object side surface of the first lens is located on the image side of the connection position of the inclined surface and the object side end surface; the spacer element group includes a first spacer element disposed on the image side of the first lens and in partial contact with the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and in partial contact with the image side surface of the second lens; the effective focal length f of the imaging lens, the entrance pupil diameter EPD of the imaging lens, and the object side inner diameter d0s of the lens barrel satisfy the following relationship: 0.30 mm -1 ≤f / EPD / d0s≤0.35mm -1 The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the distance EP01 from the object side end face of the lens barrel to the object side face of the first spacer element along the optical axis satisfy: -0.90mm -1 2≤f1 / f2 / EP01≤-0.72mm -1 .

[0009] Furthermore, the distance EP01 from the object side end face of the lens barrel to the object side face of the first spacer element along the optical axis and the distance EP12 from the image side face of the first spacer element to the object side face of the second spacer element along the optical axis satisfy the following conditions: 2.20 <EP01 / EP12<2.85。

[0010] Furthermore, the object side inner diameter d1s of the first spacer element and the minimum aperture d0smin of the lens barrel satisfy the following relationship: 0.85 <d1s / d0smin<1.15。

[0011] Furthermore, the object side outer diameter D0s of the lens barrel and the minimum aperture d0smin of the lens barrel satisfy the following relationship: 2.50 <D0s / d0smin<4.65。

[0012] Furthermore, the entrance pupil diameter EPD of the imaging lens and the minimum aperture d0smin of the lens barrel satisfy the following relationship: 0.65 <EPD / d0smin<0.95。

[0013] Furthermore, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 2.10 < (CT1 + CT2) / T12 ≤ 2.40; the object-side outer diameter D2s of the second spacer element, the distance EP12 along the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element, and the central thickness CT2 of the second lens satisfy: 7.45 < D2s / (EP12 / CT2) < 10.15.

[0014] Furthermore, the maximum axial thickness Y of the object-side end of the lens barrel satisfies: 1.10 mm < Y < 1.50 mm.

[0015] Furthermore, the effective focal length f1 of the first lens, the effective focal length f of the imaging lens, and the object-side outer diameter D1s of the first spacer element satisfy: -0.40 mm -1 < f1 / f / D1s < -0.20 mm -1 .

[0016] Furthermore, the effective focal length f2 of the second lens, the distance EP12 along the optical axis from the image side surface of the first spacer element to the object side of the second spacer element, and the image-side outer diameter D1m of the first spacer element satisfy: 0.40 mm -1 < f2 / EP12 / D1m < 0.65 mm -1 .

[0017] Furthermore, the spacer element group further includes a third spacer element disposed on the image side of the third lens and partially abutting against the image side surface of the third lens. The image-side outer diameter D3m of the third spacer element and the image-side inner diameter d2m of the second spacer element satisfy: 2.20 < D3m / d2m < 3.10; the distance EP23 along the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element, the central thickness CT3 of the third lens, the curvature radius R5 of the object side surface of the third lens, and the curvature radius R6 of the image side surface of the third lens satisfy: 0.30 ≤ EP23 / CT3 / (R5 / R6) ≤ 0.60.

[0018] Furthermore, at least one of the object side and the image side of the third lens is provided with a spacer element, and the maximum axial thickness of this spacer element is greater than 0.35 mm and less than or equal to 0.6 mm.

[0019] Furthermore, the length of the outer peripheral surface of the second lens along the optical axis is greater than 0.25 mm and less than or equal to 0.4 mm.

[0020] Applying the technical solution of the present utility model, the imaging lens of this application consists of a lens barrel and six lenses and multiple spacer elements arranged in the lens barrel. By reasonably arranging the positions of the six lenses and multiple spacer elements and setting the imaging lens to satisfy 2.40 < EP01 / CT1 < 2.95 and 0.40 < EP01 / d0s < 0.60, in this case, the light incident into the lens barrel is restricted by the inner diameter of the spacer element, especially the inner diameter of the first spacer element with the smallest aperture, which will reduce the light input amount of the imaging lens. Therefore, this application restricts 1.15 < (D1m - d1s) / d2s < 2.00, reasonably restricting the ratio of the difference between the outer diameter of the image side and the inner diameter of the object side of the first spacer element to the inner diameter of the object side of the second spacer element, ensuring that the relative positions and aperture size relationships of the first spacer element and the second spacer element are within a reasonable range, thereby enabling the effective transmission of imaging light, while reducing the scattering and reflection of light between the first lens and the second lens, ensuring that the light reaches the imaging surface through the imaging lens to the greatest extent, avoiding the risk of distorted images such as dead angles on the imaging surface, increasing the light input amount, ensuring the illuminance, being beneficial to improving the imaging brightness, and being beneficial to enhancing the imaging clarity, contrast, and resolution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0022] Figure 1 The dimension marking diagram of the imaging lens of an optional embodiment of the present utility model is shown;

[0023] Figure 2 The schematic structural diagram of the imaging lens of Embodiment 1-1 of the present utility model is shown;

[0024] Figure 3 The schematic structural diagram of the imaging lens of Embodiment 1-2 of the present utility model is shown;

[0025] Figure 4 The schematic structural diagram of the imaging lens of Embodiment 1-3 of the present utility model is shown;

[0026] Figure 5 and Figure 6 respectively show the axial chromatic aberration curve and astigmatism curve of the imaging lens of Embodiment 1 of the present utility model;

[0027] Figure 7 The schematic structural diagram of the imaging lens of Embodiment 2-1 of the present utility model is shown;

[0028] Figure 82 shows a schematic structural diagram of an imaging lens according to embodiment 2-2 of the present invention;

[0029] Figure 9 Schematic diagram showing the structure of the imaging lens of Embodiment 2-3 of the present utility model;

[0030] Figure 10 and Figure 11 axial chromatic aberration curve and astigmatism curve of the imaging lens of Example 2 of the present utility model are respectively shown;

[0031] Figure 12 1 shows a schematic structural diagram of an imaging lens according to Example 3-1 of the present utility model;

[0032] Figure 13 Schematic diagram of the structure of the imaging lens of Example 3-2 of the present utility model is shown;

[0033] Figure 14 FIG3 shows a schematic structural diagram of an imaging lens according to Example 3-3 of the present utility model;

[0034] Figure 15 and Figure 16 axial chromatic aberration curve and astigmatism curve of the imaging lens of Example 3 of the present utility model are respectively shown;

[0035] Figure 17 An illumination simulation diagram is shown when the imaging lens of an optional embodiment of the present invention satisfies EP01 / CT1=2.92, EP01 / d0s=0.43, and (D1m-d1s) / d2s=0.48;

[0036] Figure 18 An illumination simulation diagram is shown when the imaging lens of an optional embodiment of the present invention satisfies EP01 / CT1=2.92, EP01 / d0s=0.43, and (D1m-d1s) / d2s=1.96;

[0037] Figure 19 An illumination simulation diagram is shown when the imaging lens of an optional embodiment of the present invention satisfies EP01 / CT1=2.92, EP01 / d0s=0.43, and (D1m-d1s) / d2s=2.45;

[0038] Figure 20 A dimension diagram of an imaging lens according to an optional embodiment of the present invention is shown.

[0039] The above drawings include the following reference numerals:

[0040] P0, lens barrel; E1, first lens; S1, object-side surface of the first lens; S2, image-side surface of the first lens; E2, second lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; E3, third lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; E4, fourth lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; E5, fifth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; E6, sixth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; P1, first spacer; P2, second spacer; P2b, second auxiliary spacer; P3, third spacer; P3b, third auxiliary spacer; P4, fourth spacer; P4b, fourth auxiliary spacer; P5, fifth spacer; 10, inclined plane. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] 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 ordinary technicians in the technical field to which this application belongs.

[0043] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0044] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0045] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0046] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in this field, and the concavity and convexity are judged by the positive and negative values of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database (lens data) in optical software). For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. In this application, the left side is the object side and the right side is the image side.

[0047] In order to solve the problem that the existing imaging lens has light loss, resulting in poor image clarity and contrast, the present utility model provides an imaging lens. A further technical problem to be solved by the present utility model is to meet the requirements of a compact and lightweight structure, but the light entering the lens barrel is restricted by the size of the object side of the lens barrel and the size of the front-end spacer element, thereby causing light loss and resulting in poor image clarity and contrast.

[0048] As Figures 1 to 20 shown, in an optional embodiment of the present application, the imaging lens includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens barrel has an object-side end face, an image-side end face, and an inclined face. The inclined face is located at the object side end of the lens barrel. One side of the inclined face is connected to the object-side end face, and the other side of the inclined face extends in the direction towards the optical axis of the lens barrel. The edge of the inclined face closest to the optical axis is at the minimum aperture of the lens barrel; the lens group is composed of six lenses. The six lenses sequentially include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens from the object side to the image side. The maximum outer diameters of the first lens to the sixth lens gradually increase from the object side to the image side. The object side surface of the first lens is located on the image side of the connection position between the inclined face and the object-side end face; the spacer element group includes a first spacer element disposed on the image side of the first lens and partially contacting the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and partially contacting the image side surface of the second lens; the distance EP01 along the optical axis direction from the object-side end face of the lens barrel to the object-side surface of the first spacer element and the central thickness CT1 of the first lens satisfy: 2.40 < EP01 / CT1 < 2.95; EP01 and the object-side inner diameter d0s of the lens barrel satisfy: 0.40 < EP01 / d0s < 0.6; the image-side outer diameter D1m of the first spacer element, the object-side inner diameter d1s of the first spacer element, and the object-side inner diameter d2s of the second spacer element satisfy: 1.15 < (D1m - d1s) / d2s < 2.00.

[0049] The imaging lens of the present application consists of a lens barrel and six lenses and multiple spacer elements arranged in the lens barrel. By reasonably arranging the positions of the six lenses and multiple spacer elements and setting the imaging lens to satisfy 2.40 < EP01 / CT1 < 2.95 and 0.40 < EP01 / d0s < 0.60, in this case, the light incident into the lens barrel is restricted by the inner diameter of the spacer element, especially the inner diameter of the first spacer element with the smallest aperture, which will reduce the light input amount of the imaging lens. Therefore, the present application constrains 1.15 < (D1m - d1s) / d2s < 2.00, reasonably constraining the ratio of the difference between the outer diameter of the image side of the first spacer element and the inner diameter of its object side to the inner diameter of the object side of the second spacer element, ensuring that the relative positions and aperture size relationships of the first spacer element and the second spacer element are within a reasonable range, so as to support the effective transmission of imaging light, while reducing the scattering and reflection of light between the first lens and the second lens, ensuring that the light reaches the imaging surface through the imaging lens to the greatest extent, avoiding the risk of distorted images such as dead angles on the imaging surface, increasing the light input amount, ensuring the illuminance, being beneficial to improving the imaging brightness, and being beneficial to enhancing the imaging clarity, contrast, and resolution.

[0050] It should be noted that the above inclined plane is an annular inclined plane, the inclined plane is arranged obliquely to the optical axis of the lens barrel and is inclined at an obtuse or acute angle to the optical axis of the lens barrel. The side of the inclined plane close to the optical axis is on the image side of the side of the inclined plane far from the optical axis.

[0051] It should also be noted that each lens consists of an optically effective part and an optical mechanism part. The optical mechanism part is located on the outer peripheral side of the optically effective part and is arranged circumferentially around the optically effective part, and the two are connected. The optically effective part is used for the passage of imaging light, while the optical mechanism part is not used for the passage of imaging light and is used to abut against the lens barrel or adjacent lenses or adjacent spacer elements. The object side and image side of the optically effective part are both optically effective surfaces. The optically effective surface of the object side of the first lens is on the image side of the position with the smallest aperture on the object side of the lens barrel.

[0052] In addition, on the premise that the imaging lens satisfies EP01 / CT1 = 2.92 and EP01 / d0s = 0.43, referring to Table 1 below and Figures 17 to 19 as shown, Figure 17 shows the illuminance simulation diagram when the imaging lens satisfies (D1m - d1s) / d2s = 0.48, Figure 18 shows the illuminance simulation diagram when the imaging lens satisfies (D1m - d1s) / d2s = 1.96, Figure 19 shows the illuminance simulation diagram when the imaging lens satisfies (D1m - d1s) / d2s = 2.45.

[0053] By Figures 17 to 19It can be seen that when (D1m - d1s) / d2s = 0.48, the inner aperture diameters of the first spacer element and the second spacer element increase, causing an increase in reflection and diffusion when light passes through the first lens and the second lens, resulting in an increase in light loss. At this time, a circular aperture with a bright center appears on the illuminance simulation diagram, but the diameter of the circular aperture is limited and the aperture uniformity is poor, and the illuminance simulation diagram shows a poor performance, resulting in vignetting distortion in the final image. When (D1m - d1s) / d2s = 2.45, the inner aperture diameters of the first spacer element and the second spacer element decrease, causing the incident light to be intercepted at the first lens, allowing only a very small number of light rays to reach the imaging surface through the lens, reducing the light transmission amount. A very small bright aperture appears on the illuminance simulation diagram, the aperture is small, and the illuminance simulation diagram shows a poor performance, resulting in serious distortion in the final image. When (D1m - d1s) / d2s = 1.96, the bright aperture presented on the illuminance simulation diagram is large enough, the light flux is sufficient, the aperture uniformity is good, the illuminance performance is the best, and it can ensure the clarity and contrast of the final imaging image.

[0054] It can be seen from this that when (D1m - d1s) / d2s is within the range of 1.15 to 2.0, the aperture presented by the illuminance simulation diagram of the imaging lens is the largest, the uniformity is the best, and the performance is the best. Therefore, in this application, by restricting 1.15 < (D1m - d1s) / d2s < 2.0, the ratio of the difference between the outer diameter of the image side surface and the inner diameter of the object side surface of the first spacer element to the inner diameter of the object side surface of the second spacer element is reasonably restricted, ensuring that the relative positions and the dimensional relationship of the apertures of the first spacer element and the second spacer element are within a reasonable range, so as to support effective light transmission, while reducing the scattering and reflection of light between the first lens and the second lens, ensuring that the light passes through the lens to the imaging surface to the greatest extent, avoiding the risk of forming dead angles and other distorted images on the imaging surface, and ensuring the clarity and contrast of the imaging.

[0055] Conditional expression (D1m-d1s) / d2s=0.48 (D1m-d1s) / d2s=1.96 (D1m-d1s) / d2s=2.45 Illumination simulation diagram Figure 17 Figure 18 Figure 19

[0056] Table 1

[0057] In this embodiment, the distance EP01 from the object side end face of the lens barrel to the object side surface of the first spacer element along the optical axis direction and the interval distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element along the optical axis direction satisfy: 2.20 < EP01 / EP12 < 2.85. Such a setting can control the propagation path of light in the optical system by restricting the edge thicknesses of the first lens and the second lens, thereby reducing aberrations and distortions such as spherical aberration, coma, and astigmatism, being beneficial to optimizing the clarity and quality of imaging, while minimizing the volume and weight of the optical system as much as possible, facilitating the molding of the lens barrel and the arrangement of each lens in the lens barrel.

[0058] In this embodiment, the following condition is satisfied between the object-side inner diameter d1s of the first spacer element and the minimum aperture diameter d0smin of the lens barrel: 0.85 < d1s / d0smin < 1.15. The object-side inner diameter of the first spacer element determines the aperture size of the light passing through the first spacer element, while the minimum aperture diameter of the lens barrel limits the minimum diameter through which the light can pass in the entire optical path. By defining the above conditional expression, it is possible to ensure the compact structure of the imaging lens while ensuring that the first spacer element does not affect the normal incidence of light, avoiding the risk of restricting the light flux due to the first spacer element, and thus ensuring a sufficient light passing rate; at the same time, it is possible to avoid the aberration and distortion introduced due to the excessive aperture of the first spacer element, which helps to maintain the clarity and accuracy of imaging.

[0059] In this embodiment, the following condition is satisfied between the object-side outer diameter D0s of the lens barrel and the minimum aperture diameter d0smin of the lens barrel: 2.50 < D0s / d0smin < 4.65. The object-side outer diameter of the lens barrel determines the external dimensions and shape of the lens barrel. By defining the above conditional expression, it is possible to ensure that the lens barrel has a sufficient wall thickness, thereby ensuring the structural strength and stability of the lens barrel; at the same time, it ensures that the lens barrel has a large heat capacity and a low thermal sensitivity, which helps to reduce the performance changes caused by temperature variations and improve the thermal stability of the system.

[0060] In this embodiment, the following condition is satisfied between the entrance pupil diameter EPD of the imaging lens and the minimum aperture diameter d0smin of the lens barrel: 0.65 < EPD / d0smin < 0.95. The entrance pupil diameter determines the maximum aperture of the light that the system can receive, while the minimum aperture diameter of the lens barrel limits the minimum diameter through which the light can pass through the lens barrel. By defining the above conditional expression, it is possible to ensure that the system receives sufficient light flux, while avoiding the situation of increased light loss caused by an overly large entrance pupil diameter, and avoiding the risk of wasted light energy due to an overly large entrance pupil diameter where the light cannot be fully utilized by the lens barrel.

[0061] In this embodiment, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 2.10 < (CT1 + CT2) / T12 ≤ 2.40. The object-side outer diameter D2s of the second spacer element, the distance EP12 along the optical axis from the image side of the first spacer element to the object side of the second spacer element, and the center thickness CT2 of the second lens satisfy: 7.45 < D2s / (EP12 / CT2) < 10.15. The constraint 2.10 < (CT1 + CT2) / T12 ≤ 2.40 controls the ratio of the sum of the center thicknesses of the first lens and the second lens to the air gap between them, which can optimize the optical performance of the lens group, reduce aberration and improve imaging quality, and also helps to control the total length of the optical system. In addition, appropriate lens thickness and gap ratio also contribute to improving the mechanical stability and thermal stability of the system, reducing performance fluctuations caused by external environmental changes; the constraint 7.45 < D2s / (EP12 / CT2) < 10.15 can further ensure that the size and position of the spacer element meet the requirements of the optical system, optimize the optical path design, reduce light loss and scattering in the spacer element, and improve the light transmittance and imaging quality of the system. In addition, it is beneficial to achieve a more compact optical design and reduce the volume and weight of the system on the premise of meeting the optical performance.

[0062] In this embodiment, the maximum axial thickness Y of the object-side end of the lens barrel satisfies: 1.10 mm < Y < 1.50 mm. By controlling the maximum thickness of the lens barrel near the object-side end, it is beneficial to ensure the structural strength of the lens barrel end face, ensure the rigidity and anti-deformation ability of the lens barrel, thereby improving the stability and durability of the entire system, and can also reduce the influence of temperature change on imaging quality. At the same time, in the actual molding manufacturing process, it can also ensure the feasibility and economy of the molding manufacturing process.

[0063] In this embodiment, the effective focal length f1 of the first lens, the effective focal length f of the imaging lens, and the object-side outer diameter D1s of the first spacer element satisfy: -0.40 mm -1 < f1 / f / D1s < -0.20 mm -1 . By setting the focal length ratio between the first lens and the entire imaging lens and controlling the size of the first spacer element within a reasonable range, it can ensure that light can pass through the lens system in the expected manner. At the same time, by restricting the relationship between the object-side outer diameter of the first spacer element and the focal length ratio, the outer diameter size of the first lens is further constrained, reducing the problem of imaging quality degradation caused by assembly errors.

[0064] In this embodiment, the following relationship is satisfied among the effective focal length f2 of the second lens, the distance EP12 along the optical axis from the image side surface of the first spacer element to the object side of the second spacer element, and the outer diameter D1m of the image side of the first spacer element: 0.40 mm -1 <f2 / EP12 / D1m<0.65 mm -1 . By setting the ratio of the relative position between the second lens and the first spacer element and the focal length within a reasonable range, it helps to restrict the outer diameter size of the second lens and the thickness of the mechanism part within a reasonable range, thereby increasing the assembly stability of the first lens and at the same time reducing the molding difficulty of the second lens.

[0065] In this embodiment, the spacer element group further includes a third spacer element disposed on the image side of the third lens and partially abutting against the image side surface of the third lens. The following relationship is satisfied between the outer diameter D3m of the image side of the third spacer element and the inner diameter d2m of the image side of the second spacer element: 2.20 < D3m / d2m < 3.10. The following relationship is satisfied among the distance EP23 along the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element, the central thickness CT3 of the third lens, the curvature radius R5 of the object side surface of the third lens, and the curvature radius R6 of the image side surface of the third lens: 0.30 ≤ EP23 / CT3 / (R5 / R6) ≤ 0.60. By restricting 2.20 < D3m / d2m < 3.10, a wider optical path channel can be obtained, which is beneficial to reducing the blocking and scattering of light, and at the same time can ensure the structural compactness of the imaging lens, avoiding vignetting or light loss caused by an overly narrow light path channel, and finally achieving the compactness inside the lens and a stable and reliable optical path design. By restricting 0.30 ≤ EP23 / CT3 / (R5 / R6) ≤ 0.60, three parameters including the spacer distance, the lens central thickness, and the curvature radius of the lens are controlled, which can optimize the optical power distribution of the imaging lens, reduce aberration, and at the same time ensure that the lens can maintain a stable positional relationship when受力, which has an important impact on the imaging quality and structural stability of the imaging lens.

[0066] In this embodiment, at least one spacer element is provided on at least one of the object side and the image side of the third lens, and the maximum axial thickness of the spacer element is greater than 0.35 mm and less than or equal to 0.6 mm. This enables the spacer element to provide stronger support for the third lens, reduces the lens molding difficulty, ensures the rationality of the structural arrangement, helps to reduce the situation of lens position deviation caused by lens vibration or external shock, thereby enhancing the overall structural stability of the lens; by controlling the thickness and position of the spacer element, the optical path of the imaging lens can be finely adjusted to ensure that light can propagate along a predetermined path, reduce aberration and distortion, and improve the imaging quality.

[0067] In this embodiment, the outer periphery of the second lens has a length along the optical axis greater than 0.25 mm and less than or equal to 0.4 mm. Providing a thicker lens edge provides improved deformation resistance, effectively reducing changes in lens shape in the face of external impact or vibration, and maintaining the stability of the second lens' optical performance. Since lens thickness is closely related to its optical performance, appropriately increasing the thickness of the lens edge helps reduce aberrations such as spherical aberration and coma caused by changes in lens shape, thereby improving image quality. Furthermore, a thicker second lens edge provides more flexible layout options for the design and arrangement of other optical components.

[0068] In addition, in another optional embodiment of the present application, an imaging lens is also provided, which includes a lens barrel and a lens group and a spacer element group arranged in the lens barrel, the lens barrel having an object side end face, an image side end face and an inclined surface, the inclined surface is located at the object side end of the lens barrel, one side of the inclined surface is connected to the object side end face, and the other side of the inclined surface extends toward the direction close to the optical axis of the lens barrel, and the edge of the inclined surface closest to the optical axis is at the minimum aperture of the lens barrel; the lens group is composed of six lenses, and the six lenses include, from the object side to the image side, a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with optical power, a fifth lens with positive focal power and a sixth lens with negative focal power, the object side face of the first lens is concave, and the image side face is concave; the second lens The object side surface is convex, and the image side surface is convex; the object side surface of the third lens is convex, and the image side surface is concave; the object side surface of the fourth lens is convex, and the image side surface is concave; the object side surface of the fifth lens is convex, and the image side surface is convex; the object side surface of the sixth lens is convex, and the image side surface is concave; the maximum outer diameters of the first to sixth lenses gradually increase from the object side to the image side, and the object side surface of the first lens is located on the image side of the connecting position of the inclined surface and the object side end surface; the spacer element group includes a first spacer element placed on the image side of the first lens and in partial contact with the image side surface of the first lens, and a second spacer element placed on the image side of the second lens and in partial contact with the image side surface of the second lens; the effective focal length f1 of the first lens, the effective focal length f of the imaging lens and the object side outer diameter D1s of the first spacer element satisfy: -0.40mm -1 <f1 / f / D1s<-0.20mm -1 The effective focal length f2 of the second lens, the spacing distance EP12 from the image side of the first spacer element to the object side of the second spacer element along the optical axis and the image side outer diameter D1m of the first spacer element satisfy: 0.40mm -1 <f2 / EP12 / D1m<0.65mm -1 .

[0069] The imaging lens of the present application is composed of a lens barrel, six lenses arranged in the lens barrel, and a plurality of spacer elements. By reasonably arranging the first lens with negative focal power, the second lens with positive focal power, the third lens with negative focal power, the fifth lens with positive focal power, the sixth lens with negative focal power, the positions of the plurality of spacer elements, and setting the imaging lens to meet the -0.40mm -1 <f1 / f / D1s<-0.20mm -1 and 0.40mm -1 <f2 / EP12 / D1m<0.65mm -1 Since the first and second lenses, as the lenses closest to the object side, are crucial to the imaging of the entire optical system, this arrangement can ensure that the focal length ratio between the first lens and the entire optical system and the size of the first spacer element are within a reasonable range, and the relative position and focal length ratio between the second lens and the first spacer element are within a reasonable range. At the same time, by limiting the relationship between the outer diameter of the first spacer element and the first and second lenses, and thereby constraining the outer diameter size of the first lens, the outer diameter size of the second lens, and the thickness of the mechanism part, the relative position and stability between the first and second lenses can be ensured, the degradation of imaging quality caused by assembly errors can be reduced, and the difficulty of molding the second lens can be reduced.

[0070] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0071] In addition, in another optional embodiment of the present application, an imaging lens is further provided, comprising a lens barrel and a lens group and a spacer element group arranged in the lens barrel, the lens barrel having an object-side end face, an image-side end face and an inclined surface, the inclined surface being located at the object-side end of the lens barrel, one side of the inclined surface being connected to the object-side end face, the other side of the inclined surface extending toward the direction close to the optical axis of the lens barrel, and the edge of the inclined surface closest to the optical axis being at the minimum aperture of the lens barrel; the lens group is composed of six lenses, and the six lenses include, in order from the object side to the image side, a first lens having negative optical power, a second lens having positive optical power, a third lens having negative optical power, a The invention relates to a lens having a fourth lens with a positive optical focal length, a fifth lens with a positive optical focal length, and a sixth lens with a negative optical focal length. The maximum outer diameters of the first to sixth lenses gradually increase from the object side to the image side. The object side surface of the first lens is located on the image side of the connection position of the inclined surface and the object side end surface. The spacer element group includes a first spacer element disposed on the image side of the first lens and in partial contact with the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and in partial contact with the image side surface of the second lens. The effective focal length f of the imaging lens, the entrance pupil diameter EPD of the imaging lens, and the object side inner diameter d0s of the lens barrel meet the following requirements: 0.30 mm. -1 ≤f / EPD / d0s≤0.35mm -1The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the distance EP01 from the object side end face of the lens barrel to the object side face of the first spacer element along the optical axis satisfy: -0.90mm -1 2≤f1 / f2 / EP01≤-0.72mm -1 .

[0072] The imaging lens of the present application is composed of a lens barrel, six lenses arranged in the lens barrel, and a plurality of spacer elements. By reasonably arranging the first lens with negative focal power, the second lens with positive focal power, the third lens with negative focal power, the fifth lens with positive focal power, the sixth lens with negative focal power, the positions of the plurality of spacer elements, and setting the imaging lens to meet the 0.30mm -1 ≤f / EPD / d0s≤0.35mm -1 、-0.90mm -1 2≤f1 / f2 / EP01≤-0.72mm -1 , which is conducive to constraining the relationship between the focal length, entrance pupil diameter and object side inner diameter of the entire optical system, and is conducive to ensuring that the system has sufficient luminous flux. At the same time, it avoids the situation where the light is intercepted by the lens barrel due to the limitation of the lens barrel due to the large entrance pupil diameter, thereby causing light loss. This arrangement is conducive to improving light utilization and reducing light energy loss; by setting the relative position and focal length ratio between the second lens and the first spacing element within a reasonable range, it is conducive to constraining the focal length of the first lens, the second lens and the distance from the object side end face of the lens barrel to the object side face of the first spacing element on the optical axis within a reasonable range, which is conducive to balancing the ratio of focal length and lens thickness, and is conducive to increasing the molding stability of the front-end lens, thereby increasing the assembly stability of the front-end lens.

[0073] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0074] Optionally, the imaging lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0075] The imaging lens in this application may utilize multiple lenses, such as the six lenses described above. In this application, at least one of the lens surfaces is an aspheric surface. Aspheric lenses are characterized by a continuously changing curvature from the center to the periphery of the lens. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspheric lenses have a better curvature radius characteristic, with the advantages of improving distortion and astigmatism. The use of aspheric lenses can minimize aberrations that occur during imaging, thereby improving image quality.

[0076] However, those skilled in the art will appreciate that the number of lenses comprising an imaging lens can be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while six lenses are described in the embodiments, the imaging lens is not limited to six lenses. If desired, the imaging lens may include other numbers of lenses.

[0077] Figure 1 and Figure 20 Schematic diagram of the structure of an imaging lens of the present application is shown. Figure 1 Parameters such as d1s, D1s, D1m, d2s, d2m, D2s, D3m, d0s, D0s, EP01, EP12, EP23, and d0smin are indicated in the figure. Figure 20 Y, dosmin, and bevel 10 are labeled to provide a clear and intuitive understanding of their meaning. To facilitate the description of imaging lenses and specific lens profiles, these parameters will not be included in the accompanying drawings when describing specific embodiments. The following further describes specific profiles and parameters applicable to the imaging lenses described in the above embodiments, with reference to the accompanying drawings.

[0078] It should be noted that in the following Example 1, there are three examples: Example 1-1, Example 1-2, and Example 1-3; in Example 2, there are three examples: Example 2-1, Example 2-2, and Example 2-3; and in Example 3, there are three examples: Example 3-1, Example 3-2, and Example 3-3. While the imaging lenses of the three examples in the same Example have the same parameters such as the radius of curvature, center thickness, and spacing between the first through sixth lenses, as well as the spacing between the lenses and the higher-order coefficients, they differ in parameters such as the thickness, inner diameter, and outer diameter of the lens barrel and the first through fifth spacers, as well as the shapes of some lenses. In other words, the main structures for imaging are the same, while the auxiliary structures for imaging are different.

[0079] It should be noted that any one of the following embodiments 1 to 3 is applicable to all embodiments of the present application.

[0080] Example 1

[0081] like Figures 2 to 6 As shown, the imaging lens of the first embodiment is described. Figure 2 1-1 shows a schematic structural diagram of the imaging lens of Example 1-1. Figure 3 Schematic diagram of the structure of the imaging lens of Example 1-2 is shown. Figure 4 Schematic diagrams of the structures of imaging lenses of Examples 1-3 are shown.

[0082] like Figures 2 to 4As shown, the imaging lens includes a lens barrel P0 and, arranged in order from the object side to the image side along the optical axis of the lens barrel P0, the following lenses: a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a second auxiliary spacer P2b, a third lens E3, a third spacer P3, a third auxiliary spacer P3b, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, and a sixth lens E6. An inclined surface 10 of the lens barrel P0 is located at the object side end of the lens barrel P0 and is arranged obliquely with respect to the optical axis.

[0083] like Figure 2 1-1. The figure shows the structure of the imaging lens of Example 1-1. In this example, the object-side surface S1 of the first lens element partially abuts the lens barrel P0. The object-side surface and image-side surface of the first spacer element P1 partially abut the image-side surface S2 of the first lens element and the object-side surface S3 of the second lens element, respectively. The object-side surface and image-side surface of the second spacer element P2 partially abut the image-side surface S4 of the second lens element, respectively. The image-side surface of the second auxiliary spacer element P2b partially abuts the object-side surface S5 of the third lens element. The object-side surface and image-side surface of the third spacer element P3 partially abut the image-side surface S6 of the third lens element and the object-side surface of the third auxiliary spacer element P3b, respectively. The image-side surface of the third auxiliary spacer element P3b partially abuts the object-side surface S7 of the fourth lens element. The object-side surface and image-side surface of the fourth spacer element P4 partially abut the image-side surface S8 of the fourth lens element and the object-side surface S9 of the fifth lens element, respectively. The object-side surface and the image-side surface of the fifth spacer P5 partially abut against the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively.

[0084] like Figure 3 FIG2 is a schematic structural diagram of the imaging lens of Example 1-2. In this example, the supporting and abutting manner of each spacer element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to and will not be repeated here.

[0085] like Figure 4 FIG2 is a schematic structural diagram of the imaging lens of Example 1-3. In this example, the supporting and abutting manner of each spacer element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to and will not be repeated here.

[0086] In summary, the structural parameters of the imaging lens of Example 1 in Examples 1-1, 1-2, and 1-3 are shown in Table 2. (Unit: mm)

[0087] Parameters / Example 1-1 1-2 1-3 d1s 2.310 2.328 2.318 D1s 7.102 5.683 5.682 D1m 7.102 5.683 5.682 d2s 2.850 2.850 2.850 d2m 2.850 2.850 2.850 D2s 7.355 7.355 6.041 D3m 7.469 7.799 6.346 d0s 5.030 5.030 5.068 D0s 9.023 9.033 6.827 EP01 2.127 2.072 2.207 EP12 0.924 0.924 0.924 EP23 1.228 1.228 1.168 d0smin 2.279 2.279 2.279

[0088] Table 2

[0089] In Example 1, the first lens E1 has negative focal power, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is concave. The second lens E2 has positive focal power, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is convex. The third lens E3 has negative focal power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The sixth lens E6 has negative focal power, the object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave.

[0090] In Example 1, the effective focal length f of the imaging lens is 3.11 mm, the effective focal length f1 of the first lens is -6.23 mm, the effective focal length f2 of the second lens is 3.28 mm, the effective focal length f3 of the third lens is -6.97 mm, the effective focal length f4 of the fourth lens is 38.45 mm, the effective focal length f5 of the fifth lens is 2.68 mm, the effective focal length f6 of the sixth lens is -4.07 mm, and the entrance pupil diameter EPD of the imaging lens is 1.95 mm.

[0091] Table 3 shows the basic structural parameters of the imaging lens of Example 1, wherein the units of curvature radius and thickness / distance are all millimeters (mm).

[0092]

[0093]

[0094] Table 3

[0095] In Example 1, the object-side surface and the image-side surface of the first lens E1 to the sixth lens E6 are all aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0096]

[0097] Where x is the distance vector from the vertex of the aspheric surface at a height h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R, i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; and Ai is the correction coefficient for the i-th order of the aspheric surface. Table 4 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspheric mirror surface s1-s12 in Example 1.

[0098]

[0099]

[0100] Table 4

[0101] Figure 5 The axial chromatic aberration curve of the imaging lens of Example 1 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 6 The astigmatism curve of the imaging lens of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature.

[0102] according to Figure 5 and Figure 6 It can be seen that the imaging lens provided in Example 1 can achieve good imaging quality.

[0103] Example 2

[0104] like Figures 7 to 11 As shown, the imaging lens of the second embodiment is described. Figure 7 shows a schematic structural diagram of Example 2-1, Figure 8 shows a schematic structural diagram of Example 2-2, Figure 9 A schematic structural diagram of Example 2-3 is shown.

[0105] like Figures 7 to 9 As shown, the imaging lens includes a lens barrel P0 and, arranged in order from the object side to the image side along the optical axis of the lens barrel P0, the following lenses: 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 fourth lens E4, a fifth lens E5, a fifth spacer element P5, and a sixth lens E6. An inclined surface 10 of the lens barrel P0 is located at the object side end of the lens barrel P0 and is inclined relative to the optical axis.

[0106] like Figure 7 2 is a schematic structural diagram of the imaging lens of Example 2-1. In this example, a third auxiliary spacer element P3b is further included, disposed between the third spacer element P3 and the fourth lens element E4. The object-side surface S1 of the first lens element partially abuts the lens barrel P0. The object-side surface and image-side surface of the first spacer element P1 partially abut the image-side surface S2 of the first lens element and the object-side surface S3 of the second lens element, respectively. The object-side surface and image-side surface of the second spacer element P2 partially abut the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object-side surface and image-side surface of the third spacer element P3 partially abut the image-side surface S6 of the third lens element and the object-side surface of the third auxiliary spacer element P3b, respectively. The image-side surface of the third auxiliary spacer element P3b partially abuts the object-side surface S7 of the fourth lens element. The object-side surface and image-side surface of the fifth spacer element P5 partially abut the image-side surface S10 of the fifth lens element and the object-side surface S11 of the sixth lens element, respectively.

[0107] like Figure 8Figure 2 shows a schematic structural diagram of the imaging lens of Example 2-2. This example differs from Example 2-1 in that the third auxiliary spacer element P3b is not provided. The abutment and supporting mechanism of the other spacer elements is the same as that of Example 2-1. Please refer to the relevant description of Example 2-1 and will not be repeated here.

[0108] like Figure 9 FIG2 is a schematic structural diagram of the imaging lens of Example 2-3. In this example, the supporting and abutting manner of each spacer element is the same as that of Example 2-1, and will not be described in detail here.

[0109] In summary, the structural parameters of the imaging lens of Example 2 in Example 2-1, Example 2-2, and Example 2-3 are shown in Table 5. (Unit: mm)

[0110]

[0111]

[0112] Table 5

[0113] In Example 2, the first lens E1 has negative focal power, with its object-side surface S1 being concave, and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex, and its image-side surface S4 being convex. The third lens E3 has negative focal power, with its object-side surface S5 being convex, and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex, and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being convex, and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being convex, and its image-side surface S12 being concave.

[0114] In Example 2, the effective focal length f of the imaging lens is 2.86 mm, the effective focal length f1 of the first lens is -5.20 mm, the effective focal length f2 of the second lens is 2.85 mm, the effective focal length f3 of the third lens is -5.83 mm, the effective focal length f4 of the fourth lens is -14.78 mm, the effective focal length f5 of the fifth lens is 2.21 mm, the effective focal length f6 of the sixth lens is -4.22 mm, and the entrance pupil diameter (EPD) of the imaging lens is 1.79 mm.

[0115] Table 6 shows the basic structural parameters of the imaging lens of Example 2, where the units of curvature radius and thickness / distance are all millimeters.

[0116]

[0117]

[0118] Table 6

[0119] Table 7 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspheric mirror surfaces s1-s12 in Example 2. The surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0120]

[0121] Table 7

[0122] Figure 10 The axial chromatic aberration curve of the imaging lens of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 11 The astigmatism curve of the imaging lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature.

[0123] according to Figure 10 and Figure 11 It can be seen that the imaging lens provided in the second embodiment can achieve good imaging quality.

[0124] Example 3

[0125] like Figures 12 to 16 As shown, the imaging lens of the third embodiment is described. Figure 12 FIG3 shows a schematic structural diagram of the imaging lens of Example 3-1. Figure 13 FIG3 shows a schematic structural diagram of the imaging lens of Example 3-2. Figure 14 A schematic structural diagram of the imaging lens of Example 3-3 is shown.

[0126] like Figures 12 to 14 As shown, the imaging lens includes a lens barrel P0 and, arranged in order from the object side to the image side along the optical axis of the lens barrel P0, the following lenses: a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a second auxiliary spacer P2b, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4, a fifth lens E5, a fifth spacer P5, and a sixth lens E6. An inclined surface 10 of the lens barrel P0 is located at the object side end of the lens barrel P0 and is inclined relative to the optical axis.

[0127] like Figure 12, which is a schematic structural diagram of the imaging lens of Example 3-1. In this example, the object-side surface S1 of the first lens element partially abuts the lens barrel P0. The object-side surface and image-side surface of the first spacer element P1 partially abut the image-side surface S2 of the first lens element and the object-side surface S3 of the second lens element, respectively. The object-side surface and image-side surface of the second spacer element P2 partially abut the image-side surface S4 of the second lens element, respectively. The image-side surface of the second auxiliary spacer element P2b partially abuts the object-side surface S5 of the third lens element. The object-side surface and image-side surface of the third spacer element P3 partially abut the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, respectively. The object-side surface and image-side surface of the fourth spacer element P4 partially abut the image-side surface S8 of the fourth lens element and the object-side surface of the fourth auxiliary spacer element P4b, respectively. The image-side surface of the fourth auxiliary spacer element P4b partially abuts the object-side surface S9 of the fifth lens element. The object-side surface and the image-side surface of the fifth spacer P5 partially abut against the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively.

[0128] like Figure 13 FIG3 is a schematic structural diagram of the imaging lens of Example 3-2. In this example, the supporting and abutting manner of each spacer element is the same as that of Example 3-1. Please refer to the relevant description of Example 3-1 and will not be repeated here.

[0129] like Figure 14 FIG3 is a schematic structural diagram of an imaging lens according to Example 3-3. In this example, the supporting and abutting manner of each spacer element is the same as that of Example 3-1. For reference, the relevant description in Example 3-1 can be made and will not be repeated here.

[0130] In summary, the structural parameters of the imaging lens of Example 3 under Example 3-1, Example 3-2, and Example 3-3 are shown in Table 8. (Unit: mm)

[0131] Parameters / Example 3-1 3-2 3-3 d1s 2.179 2.179 2.179 D1s 6.963 5.316 6.963 D1m 6.963 5.316 6.963 d2s 2.554 2.554 2.554 d2m 2.554 2.554 2.554 D2s 7.216 6.963 5.766 D3m 7.441 6.226 7.441 d0s 4.891 4.540 4.891 D0s 8.884 8.802 5.683 EP01 2.126 2.127 2.215 EP12 0.924 0.924 0.924 EP23 1.079 1.086 1.086 d0smin 2.140 1.910 2.140

[0132] Table 8

[0133] In Example 3, the first lens E1 has negative focal power, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is concave. The second lens E2 has positive focal power, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is convex. The third lens E3 has negative focal power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The sixth lens E6 has negative focal power, the object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave.

[0134] In Example 3, the effective focal length f of the imaging lens is 2.87 mm, the effective focal length f1 of the first lens is -5.64 mm, the effective focal length f2 of the second lens is 3.02 mm, the effective focal length f3 of the third lens is -5.94 mm, the effective focal length f4 of the fourth lens is 23.38 mm, the effective focal length f5 of the fifth lens is 2.50 mm, the effective focal length f6 of the sixth lens is -3.60 mm, and the entrance pupil diameter EPD of the imaging lens is 1.80 mm.

[0135] Table 9 shows the basic structural parameters of the imaging lens of Example 3, where the units of curvature radius and thickness / distance are all millimeters.

[0136]

[0137] Table 9

[0138] Table 7 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspheric mirror surfaces s1-s12 in Example 3. The surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0139]

[0140]

[0141] Table 10

[0142] Figure 15 The axial chromatic aberration curve of the imaging lens of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 16 The astigmatism curve of the imaging lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature.

[0143] according to Figure 15 and Figure 16It can be seen that the imaging lens provided in Example 3 can achieve good imaging quality.

[0144] In summary, Examples 1 to 3 respectively satisfy the relationships shown in Table 11.

[0145]

[0146]

[0147] Table 11

[0148] Table 12 shows the effective focal length f of the imaging lens of Examples 1 to 3, the entrance pupil diameter EPD of the imaging lens, and the effective focal length of each lens.

[0149] Data / Example Example 1 Example 2 Example 3 EPD(mm) 1.95 1.79 1.80 f(mm) 3.11 2.86 2.87 f1(mm) -6.23 -5.20 -5.64 f2(mm) 3.28 2.85 3.02 f3(mm) -6.97 -5.83 -5.94 f4(mm) 38.45 -14.78 23.38 f5(mm) 2.68 2.21 2.50 f6(mm) -4.07 -4.22 -3.60

[0150] Table 12

[0151] The present application also provides an imaging device, wherein the electronic photosensitive element thereof may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device may be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging lens described above.

[0152] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0153] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0154] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0155] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An imaging lens, characterized in that: comprising a lens barrel and a lens group and a spacer element group arranged in the lens barrel, The lens barrel has an object-side end surface, an image-side end surface, and an inclined surface, wherein the inclined surface is located at the object-side end of the lens barrel, one side of the inclined surface is connected to the object-side end surface, and the other side of the inclined surface extends toward the direction close to the optical axis of the lens barrel, and the edge of the inclined surface closest to the optical axis is located at the minimum aperture of the lens barrel; The lens group is composed of six lenses, and the six lenses include, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The maximum outer diameters of the first to sixth lenses gradually increase from the object side to the image side. The object side surface of the first lens is located on the image side of the connection position of the inclined surface and the object side end surface. The spacer element group includes a first spacer element disposed on the image side of the first lens and in partial contact with the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and in partial contact with the image side surface of the second lens; The distance EP01 from the object side end face of the lens barrel to the object side face of the first spacer element along the optical axis and the center thickness CT1 of the first lens satisfy the following conditions: 2.40 <EP01 / CT1<2.95; The distance between EP01 and the inner diameter d0s of the lens barrel on the object side satisfies: 0.40 <EP01 / d0s<0.60; An image-side outer diameter D1m of the first spacer element, an object-side inner diameter d1s of the first spacer element, and an object-side inner diameter d2s of the second spacer element satisfy the following relationship: 1.15<(D1m-d1s) / d2s<2.

00.

2. The imaging lens according to claim 1, wherein: The distance EP01 from the object side end face of the lens barrel to the object side face of the first spacer element along the optical axis and the distance EP12 from the image side face of the first spacer element to the object side face of the second spacer element along the optical axis satisfy the following conditions: 2.20 <EP01 / EP12<2.85。 3. The imaging lens according to claim 1, wherein: The object side inner diameter d1s of the first spacer element and the minimum aperture d0smin of the lens barrel satisfy the following relationship: 0.85 <d1s / d0smin<1.15。 4. The imaging lens according to claim 1, wherein: The object side outer diameter D0s of the lens barrel and the minimum aperture d0smin of the lens barrel satisfy the following conditions: 2.50 <D0s / d0smin<4.65。 5. The imaging lens according to claim 1, wherein: The entrance pupil diameter EPD of the imaging lens and the minimum aperture d0smin of the lens barrel satisfy the following conditions: 0.65 <EPD / d0smin<0.95。 6. The imaging lens according to claim 1, wherein: The center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following: 2.10<(CT1+CT2) / T12≤2.40; The object side outer diameter D2s of the second spacer element, the spacing distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element along the optical axis, and the center thickness CT2 of the second lens satisfy: 7.45 <D2s / (EP12 / CT2)<10.15。 7. The imaging lens according to claim 1, wherein: The maximum axial thickness Y of the object side end of the lens barrel satisfies: 1.10 mm <Y<1.50mm。 8. The imaging lens according to claim 1, wherein: The effective focal length f1 of the first lens, the effective focal length f of the imaging lens, and the object side outer diameter D1s of the first spacer element satisfy the following relationship: -0.40mm -1 <f1 / f / D1s<-0.20mm -1 。 9. The imaging lens according to claim 1, wherein: The effective focal length f2 of the second lens, the spacing distance EP12 from the image side of the first spacer element to the object side of the second spacer element along the optical axis, and the image side outer diameter D1m of the first spacer element satisfy: 0.40 mm -1 <f2 / EP12 / D1m<0.65mm -1 .

10. The imaging lens according to claim 1, wherein: The spacer element group further includes a third spacer element disposed on the image side of the third lens and partially in contact with the image side surface of the third lens. The image side outer diameter D3m of the third spacer element and the image side inner diameter d2m of the second spacer element satisfy: 2.20 <D3m / d2m<3.10; The spacing distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element along the optical axis, the center thickness CT3 of the third lens, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.30≤EP23 / CT3 / (R5 / R6)≤0.

60.

11. The imaging lens according to claim 1, wherein: A spacer element is provided on at least one of the object side and the image side of the third lens, and the maximum axial thickness of the spacer element is greater than 0.35 mm and less than or equal to 0.6 mm.

12. The imaging lens according to claim 1, wherein: The length of the outer peripheral surface of the second lens along the optical axis direction is greater than 0.25 mm and less than or equal to 0.4 mm.

Images