Imaging lens

Abstract

The application provides an imaging lens, comprising: a lens barrel; a lens group, the lens group being arranged in the lens barrel, wherein the refractive index of a second lens and the refractive index of a third lens are both greater than 1.63; a plurality of abutting members, the abutting members being arranged in the lens barrel and being in contact with lenses in the lens group, wherein the inner diameter of an object side surface of a second abutting member and the inner diameter of an image side surface of the second abutting member are both greater than 2.2 mm; the inner diameter d2s of the object side surface of the second abutting member, the inner diameter d1m of the image side surface of a first abutting member, the radius of curvature R3 of the object side surface of the second lens and the Abbe number V2 of the second lens satisfy: 0 mm ‑1 <(d2s / d1m) / (R3 / V2)<1.0 mm ‑1 ; the inner diameter d2m of the image side surface of the second abutting member, the inner diameter d3s of the object side surface of a third abutting member, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: -0.1<(d2m-d3s) / (R5+R6)<1.5. The application solves the problem that the lens located in the middle part of the imaging lens in the prior art is prone to stray light.

Description

Technical Field

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

[0002] In recent years, as virtual reality technology has moved from theory to reality, head-mounted portable devices have become increasingly common in our lives. Users' demands for these devices are also gradually increasing. In some cases, head-mounted devices need to perceive their surroundings for precise positioning, requiring the imaging lenses mounted on them to have a sufficiently large field of view and clear imaging. At the same time, head-mounted devices are developing towards thinner and lighter designs, and the imaging lenses mounted on them are also developing towards miniaturization. The conventional method is to reduce the number of lenses used, but this reduces the freedom of lens design, resulting in poor image quality. A particularly prominent issue is the difficulty in controlling the light path of the imaging lens, causing stray light to easily form at the edges of lenses located in the center of the lens, preventing the imaging lens from meeting the required imaging performance. Summary of the Invention

[0003] The main objective of this invention is to provide an imaging lens to solve the problem that stray light is easily generated by the lens located in the middle of the imaging lens in the prior art.

[0004] To achieve the above objectives, according to one aspect of the present invention, an imaging lens is provided, comprising: a lens barrel; a lens group disposed within the lens barrel, the lens group including, sequentially from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, and a fourth lens, wherein the refractive index of the second lens and the refractive index of the third lens are both greater than 1.63; and a plurality of support members disposed within the lens barrel and in contact with the lens portions within the lens group, wherein the plurality of support members include a first support member disposed on the image side of the first lens and in at least partial contact with the image side surface of the first lens, a second support member disposed on the image side of the second lens and in at least partial contact with the image side surface of the second lens, and a third support member disposed on the image side of the third lens and in at least partial contact with the image side surface of the third lens, wherein the inner diameters of the object side surface and the image side surface of the second support member are greater than 2.2 mm; the inner diameter d2s of the object side surface of the second support member, the inner diameter d1m of the image side surface of the first support member, the radius of curvature R3 of the object side surface of the second lens, and the Abbe number V2 of the second lens satisfy the following condition: 0 mm. -1 <(d2s / d1m) / (R3 / V2)<1.0mm -1 The inner diameter d2m of the image side of the second support member, the inner diameter d3s of the object side of the third support member, the radius of curvature R5 of the object side of the third lens, and the radius of curvature R6 of the image side of the third lens satisfy the following condition: -0.1 < (d2m - d3s) / (R5 + R6) < 1.5.

[0005] According to another aspect of the present invention, an imaging lens is provided, comprising a lens barrel, a lens group, and a plurality of support members. The lens group is disposed within the lens barrel and sequentially comprises a first lens, a second lens, a third lens, and a fourth lens along the optical axis from the object side to the image side, wherein the refractive index of the second lens and the refractive index of the third lens are both greater than 1.63. The support members are disposed within the lens barrel and contact the lens portions within the lens group, wherein the plurality of support members include a first support member disposed on the image side of the first lens and at least partially contacting the image side surface of the first lens, and a support member disposed on the second lens... The second support member, located on the image side of the third lens and at least partially in contact with the image side of the second lens, and the third support member, located on the image side of the third lens and at least partially in contact with the image side of the third lens, have an inner diameter greater than 2.2 mm for the object side and the image side of the second support member; the outer diameter D3m of the image side of the third support member, the inner diameter d3m of the image side of the third support member, the outer diameter D3s of the object side of the third support member, the inner diameter d3s of the object side of the third support member, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 3.2 mm. -1 <(D3m / d3m+D3s / d3s) / T34<5.2mm -1 Because the inner diameter of the second support member in this application is greater than 2.2 mm, the support area of ​​the second support member is relatively small for miniaturized imaging lenses, which can easily lead to poor stability of the imaging lens. This application controls the support area of ​​the object-side and image-side of the third support member by controlling the relationship between D3m, d3m, D3s, d3s, and T34, ensuring the length of the non-effective diameter portions of the second and third lenses, facilitating stable support between the lenses and the support member. Simultaneously, it ensures a uniform transition of the outer wall surface of the lens barrel at the positions of the second and third lenses, which is beneficial for the shaping of the lens barrel. Furthermore, the length of the lens barrel is matched with the incident light design within the lens group, ensuring the thickness of the third support member without obstructing the imaging light, thereby improving the stability of the imaging lens assembly.

[0006] Furthermore, the distance TD between the object-side surface of the first lens and the image-side surface of the fourth lens on the optical axis, and the outer diameter D0m of the image-side end face of the lens barrel and the outer diameter D0s of the object-side end face of the lens barrel satisfy the following relationship: 6.3 <TD / (D0m-D0s)<11.6。

[0007] Furthermore, the maximum thickness CP2 of the second support member, the air gap T23 between the second and third lenses on the optical axis, and the combined focal length f23 of the second and third lenses satisfy the following condition: 0 < (CP2 + T23) / f23 < 0.8.

[0008] Furthermore, the outer diameter D2m of the image side of the second support member, the outer diameter D2s of the object side of the second support member, the center thickness CT3 of the third lens, and the center thickness CT2 of the second lens satisfy the following relationship: 3.0 <D2m / D2s+CT3 / CT2<4.1。

[0009] Furthermore, the outer diameter D3m of the image-side surface of the third support member, the inner diameter d3m of the image-side surface of the third support member, the outer diameter D3s of the object-side surface of the third support member, the inner diameter d3s of the object-side surface of the third support member, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy the following: 3.2mm -1 <(D3m / d3m+D3s / d3s) / T34<5.2mm -1 .

[0010] Furthermore, the radius of curvature of the fourth lens is less than zero, and 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 support member, the inner diameter d3s of the image-side surface of the third support member, and the radius of curvature R7 of the object-side surface of the fourth lens satisfy the following relationship: -1.5 <R6 / d3s+d3m / R7<-0.5。

[0011] Furthermore, the inner diameter d2s of the object-side surface of the second support member, the inner diameter d1s of the object-side surface of the first support member, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens satisfy the following relationship: 0.8 <d2s / d1s+|R4 / R3|<1.8。

[0012] Furthermore, the inner diameter d3s of the side surface of the third support member, the center thickness CT3 of the third lens, and the refractive index N3 of the third lens satisfy the following relationship: 2.1 <d3s / (CT3 / N3)<4.3。

[0013] Furthermore, the effective focal length f3 of the third lens, the effective focal length f of the imaging lens, and the distance EP23 between the second and third support members in the optical axis direction satisfy the following condition: 0.5mm. -1 <f3 / f / EP23<3.3mm -1 .

[0014] Furthermore, the inner diameter d0m of the image-side end face of the lens barrel, the combined focal length f23 of the second and third lenses, and half of the maximum field of view (Semi-FOV) of the imaging lens satisfy the following condition: 4.2 <d0m / (f23 / tan(Semi-FOV)<5.5。

[0015] Furthermore, the effective focal length f1 of the first lens, the radius of curvature R1 of the object-side surface of the first lens, the maximum thickness CP1 of the first support member, and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following condition: -2.5 <f1 / R1+CP1 / T12<0.1。

[0016] Furthermore, the effective focal length f4 of the fourth lens, the inner diameter d0m of the image-side end face of the lens barrel, the inner diameter d3m of the image-side end face of the third support member, and the distance SAG41 from the intersection of the object-side surface of the fourth lens and the optical axis to the maximum effective half-aperture of the object-side surface of the fourth lens on the optical axis satisfy the following condition: 4.5 <f4 / (d0m / d3m) / SAG41<6.5。

[0017] Furthermore, the air gap T12 between the first lens and the second lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, and the maximum thickness CP1 of the first support member and the maximum thickness CP3 of the third support member satisfy the following condition: 1.0 < (T12 + T34) / (CP1 + CP3) < 40.5.

[0018] Furthermore, the distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the maximum effective half-aperture of the object side surface of the third lens on the optical axis, the distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the maximum effective half-aperture of the image side surface of the third lens on the optical axis, and the interval EP23 between the second support member and the third support member in the optical axis direction satisfy the following: 0 < (SAG31 - SAG32) / EP23 < 1.7.

[0019] Furthermore, the lens with positive optical power in the lens group is a positive lens, and the radius of curvature of the object side of the positive lens has the opposite sign to the radius of curvature of the image side of the positive lens.

[0020] Furthermore, the lens with negative optical power in the lens group is a negative lens, and the refractive index of a negative lens is less than 1.6.

[0021] According to the technical solution of this invention, the imaging lens includes a lens barrel, a lens group, and multiple support members. The lens group is disposed within the lens barrel and sequentially includes a first lens, a second lens, a third lens, and a fourth lens along the optical axis from the object side to the image side. The refractive indices of the second and third lenses are both greater than 1.63. The support members are disposed within the lens barrel and contact the lens portions within the lens group. The multiple support members include a first support member disposed on the image side of the first lens and at least partially in contact with its image side surface; a second support member disposed on the image side of the second lens and at least partially in contact with its image side surface; and a third support member disposed on the image side of the third lens and at least partially in contact with its image side surface. The inner diameters of the object side surface and the image side surface of the second support member are greater than 2.2 mm. The inner diameter d2s of the object side surface of the second support member, the inner diameter d1m of the image side surface of the first support member, the radius of curvature R3 of the object side surface of the second lens, and the Abbe number V2 of the second lens satisfy the following condition: 0 mm. -1 <(d2s / d1m) / (R3 / V2)<1.0mm-1 The inner diameter d2m of the image side of the second support member, the inner diameter d3s of the object side of the third support member, the radius of curvature R5 of the object side of the third lens, and the radius of curvature R6 of the image side of the third lens satisfy the following condition: -0.1 < (d2m - d3s) / (R5 + R6) < 1.5.

[0022] Because the second and third lenses in this application are made of high refractive index materials with a refractive index greater than 1.63, they have a large degree of light deflection. Consequently, some light rays, under the deflection effect of the second and third lenses, are incident on the edges of the lenses, forming more redundant light rays and thus stray light. This application addresses this by setting multiple support members between the lenses and controlling parameters such as the inner diameter of some of the support members, the radius of curvature of the second lens, and the Abbe number. This allows control over the light path entering the second lens, the deflection path of the light within the second lens, and the light path after entering the third lens. Controlling the inner diameter of the support members within the specified range ensures the integrity of the imaging light while blocking redundant edge light rays refracted by the second lens and reducing feather-like stray light generated on the second support members, thereby reducing stray light generation. Furthermore, this application also restricts the relationship between the third lens and the third support member, which can further block the edge light rays after refraction from entering the optically effective area of ​​the rear system, on the basis of the second support member blocking excess edge light and reducing feathery stray light, thereby reducing the influence of stray light on the imaging light and effectively improving the imaging quality of the imaging lens. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 A schematic diagram of the imaging lens of an optional embodiment of the present invention is shown;

[0025] Figure 2 A schematic diagram of the imaging lens of Embodiment 1 of the present invention is shown;

[0026] Figures 3 to 5 The on-axis chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of Embodiment 1 of the present invention are shown respectively.

[0027] Figure 6 A schematic diagram of the imaging lens of Embodiment 2 of the present invention is shown;

[0028] Figure 7 A schematic diagram of the imaging lens of Embodiment 3 of the present invention is shown;

[0029] Figure 8 A schematic diagram of the imaging lens of Embodiment 4 of the present invention is shown;

[0030] Figures 9 to 11 The on-axis chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of Embodiment 4 of the present invention are shown respectively.

[0031] Figure 12 A schematic diagram of the imaging lens of Embodiment 5 of the present invention is shown;

[0032] Figure 13 A schematic diagram of the imaging lens of Embodiment Six of the present invention is shown;

[0033] Figure 14 A schematic diagram of the imaging lens of Embodiment 7 of the present invention is shown;

[0034] Figures 15 to 17 The on-axis chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of Embodiment 7 of the present invention are shown respectively.

[0035] Figure 18 A schematic diagram of the imaging lens of Embodiment 8 of the present invention is shown;

[0036] Figure 19 A schematic diagram of the imaging lens of Embodiment 9 of the present invention is shown;

[0037] Figure 20 A schematic diagram of stray light in an imaging lens in an alternative embodiment of the present invention is shown;

[0038] Figure 21 A schematic diagram of stray light in an imaging lens according to the prior art of the present invention is shown.

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

[0040] P0, Lens tube; E1, First lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; P1, First support member; P1b, First auxiliary support member; E2, Second lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; P2, Second support member; P2b, Second auxiliary support member; E3, Third lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; P3, Third support member; P3b, Third auxiliary support member; E4, Fourth lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[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 one of ordinary skill in the art to which this application pertains.

[0043] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

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

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

[0046] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens data in optical software) to determine convexity or concavity. For the object side, a positive R value indicates a convex surface, and a negative R value indicates a concave surface; for the image side, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0047] To address the problem of stray light easily generated by lenses located in the center of imaging lenses in existing technologies, this invention provides an imaging lens.

[0048] First Implementation Method

[0049] like Figures 1 to 20As shown, the imaging lens includes a lens barrel, a lens group, and multiple support members. The lens group is disposed within the lens barrel and includes a first lens, a second lens, a third lens, and a fourth lens sequentially from the object side to the image side along the optical axis. The refractive indices of the second and third lenses are both greater than 1.63. The support members are disposed within the lens barrel and contact the lens portions within the lens group. The multiple support members include a first support member disposed on the image side of the first lens and at least partially in contact with its image side; a second support member disposed on the image side of the second lens and at least partially in contact with its image side; and a third support member disposed on the image side of the third lens and at least partially in contact with its image side. The inner diameters of the object side and image side of the second support member are greater than 2.2 mm. The inner diameter d2s of the object side of the second support member, the inner diameter d1m of the image side of the first support member, the radius of curvature R3 of the object side of the second lens, and the Abbe number V2 of the second lens satisfy the following condition: 0 mm. -1 <(d2s / d1m) / (R3 / V2)<1.0mm -1 The inner diameter d2m of the image side of the second support member, the inner diameter d3s of the object side of the third support member, the radius of curvature R5 of the object side of the third lens, and the radius of curvature R6 of the image side of the third lens satisfy the following condition: -0.1 < (d2m - d3s) / (R5 + R6) < 1.5.

[0050] Because the second and third lenses in this application are made of high refractive index materials with a refractive index greater than 1.63, they have a large degree of light deflection. Consequently, some light rays, under the deflection effect of the second and third lenses, are incident on the edges of the lenses, forming more redundant light rays and thus stray light. This application addresses this by setting multiple support members between the lenses and controlling parameters such as the inner diameter of some of the support members, the radius of curvature of the second lens, and the Abbe number. This allows control over the light path entering the second lens, the deflection path of the light within the second lens, and the light path after entering the third lens. Controlling the inner diameter of the support members within the specified range ensures the integrity of the imaging light while blocking redundant edge light rays refracted by the second lens and reducing feather-like stray light generated on the second support members, thereby reducing stray light generation. Furthermore, this application also restricts the relationship between the third lens and the third support member, which can further block the edge light rays after refraction from entering the optically effective area of ​​the rear system, on the basis of the second support member blocking excess edge light and reducing feathery stray light, thereby reducing the influence of stray light on the imaging light and effectively improving the imaging quality of the imaging lens.

[0051] also, Figure 20 This is a schematic diagram of stray light from the optical lens in this application. Figure 21 This is a schematic diagram of stray light from optical lenses in existing technology, or... Figure 21 It is the stray light figure when (d2m - d3s) / (R5 + R6) is not within -0.1 to 1.5 and (d2s / d1m) / (R3 / V2) is not within 0 to 1.0 mm -1 within. From Figure 20 the comparison between Figure 21 and -1 it can be seen that in this application, (d2m - d3s) / (R5 + R6) is restricted within the range of -0.1 to 1.5, and (d2s / d1m) / (R3 / V2) is restricted within the range of 0 to 1.0 mm Figure 20 and Figure 21 the light spots in represent stray light spots.

[0052] In this embodiment, the distance TD on the optical axis from the object side surface of the first lens to the image side surface of the fourth lens, the outer diameter D0m of the image side end surface of the lens barrel and the outer diameter D0s of the object side end surface of the lens barrel satisfy: 6.3 < TD / (D0m - D0s) < 11.6. By controlling TD / (D0m - D0s) within a reasonable range, the barrel length and the thickness of the lens barrel of the imaging lens are controlled within a reasonable range, so as to facilitate controlling the placement position of the color filter and is beneficial to increasing the freedom degree of the placement position of the color filter.

[0053] In this embodiment, the maximum thickness CP2 of the second bearing member, the air gap T23 on the optical axis between the second lens and the third lens, and the combined focal length f23 of the second lens and the third lens satisfy: 0 < (CP2 + T23) / f23 < 0.8. By controlling the relationship among CP2, T23 and f23, it is beneficial to controlling the thicknesses of the second lens, the third lens and the second bearing member, improving the strength of the lens, reducing the sensitivity, while ensuring the stable buckling of the lens, increasing the stability of the assembly of the imaging lens group. In addition, it can also control the deflection angle of light rays within the second lens and the third lens, reducing the generation of stray light.

[0054] In this embodiment, the outer diameter D2m of the image side surface of the second bearing member, the outer diameter D2s of the object side surface of the second bearing member, the central thickness CT3 of the third lens, and the central thickness CT2 of the second lens satisfy: 3.0 < D2m / D2s + CT3 / CT2 < 4.1. By controlling the relationship among D2m, D2s, CT3 and CT2, it is ensured that the second bearing member has sufficient bearing surfaces to ensure the bearing strength of the second bearing member, reducing the sensitivity of the second lens, while controlling the shapes of the second lens and the third lens to further reduce the lens sensitivity.

[0055] In this embodiment, the following relationships are satisfied among the outer diameter D3m of the image side surface of the third bearing member, the inner diameter d3m of the image side surface of the third bearing member, the outer diameter D3s of the object side surface of the third bearing member, the inner diameter d3s of the object side surface of the third bearing member, and the air gap T34 between the third lens and the fourth lens on the optical axis: 3.2 mm -1 <(D3m / d3m + D3s / d3s) / T34 < 5.2 mm -1 . By controlling the relationships among D3m, d3m, D3s, d3s, and T34, the bearing areas of the object side surface and the image side surface of the third bearing member can be controlled, the lengths of the non-effective diameter portions of the second lens and the third lens can be ensured, facilitating stable bearing between the lens and the bearing member. At the same time, the outer wall surface of the lens barrel transitions evenly at the positions of the second lens and the third lens, which is beneficial to the molding of the lens barrel. In addition, the length of the lens barrel matches the design of the incident light rays within the lens group, ensuring the thickness of the third bearing member without blocking the imaging light rays, so as to improve the stability of the assembly of the imaging lens group.

[0056] In this embodiment, the curvature radius of the fourth lens is less than zero, and the following relationship is satisfied among the curvature radius R6 of the image side surface of the third lens, the inner diameter d3s of the object side surface of the third bearing member, the inner diameter d3s of the image side surface of the third bearing member, and the curvature radius R7 of the object side surface of the fourth lens: -1.5 < R6 / d3s + d3m / R7 < -0.5. By controlling R6 / d3s + d3m / R7 within a reasonable range, the exit angle of the light rays when passing through the third lens and the incident angle when entering the fourth lens can be ensured to be within a reasonable range, restricting the trend of the light rays. The reasonable setting of the inner diameter of the third bearing member can block the excess light rays exiting from the edge of the third lens from entering the fourth lens, reducing the generation of stray light and improving the imaging quality.

[0057] In this embodiment, the following relationship is satisfied among the inner diameter d2s of the object side surface of the second bearing member, the inner diameter d1s of the object side surface of the first bearing member, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens: 0.8 < d2s / d1s + |R4 / R3| < 1.8. By controlling d2s / d1s + |R4 / R3| within a reasonable range, it is beneficial to control the curvature radii on both sides of the second lens, ensuring that the light rays diverge after passing through the second lens and uniformly enter the third lens, guaranteeing the imaging quality. At the same time, it can also reduce the excess marginal light rays entering the second lens and the third lens, further improving the imaging quality.

[0058] In this embodiment, the inner diameter d3s of the object side surface of the third supporting member, the central thickness CT3 of the third lens, and the refractive index N3 of the third lens satisfy: 2.1 < d3s / (CT3 / N3) < 4.3. By controlling d3s / (CT3 / N3) within a reasonable range, it is possible to ensure that the ratio of the edge thickness to the central thickness of the third lens is within a reasonable range, which is beneficial to the molding of the third lens.

[0059] In this embodiment, the effective focal length f3 of the third lens, the effective focal length f of the imaging lens, and the spacing distance EP23 between the second supporting member and the third supporting member in the optical axis direction satisfy: 0.5mm -1 < f3 / f / EP23 < 3.3mm -1 . By controlling f3 / f / EP23 within a reasonable range, it is beneficial to restrict the magnitude of the effective focal length of the third lens and the edge thickness of the third lens, thereby restricting the shape of the third lens, reducing the sensitivity of the third lens, and ensuring the imaging quality of the imaging lens.

[0060] In this embodiment, the inner diameter d0m of the image side end surface of the lens barrel, the combined focal length f23 of the second lens and the third lens, and half of the maximum field angle Semi-FOV of the imaging lens satisfy: 4.2 < d0m / (f23 / tan(Semi-FOV)) < 5.5. By controlling d0m / (f23 / tan(Semi-FOV)) within a reasonable range, the degree of light deflection at the second lens and the third lens can be controlled, and at the same time, the step difference between the second lens and the third lens can be controlled to control the size of the lens barrel, ensuring that the imaging lens has the advantage of a large field angle in the case of miniaturization.

[0061] In this embodiment, the effective focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, the maximum thickness CP1 of the first supporting member, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: -2.5 < f1 / R1 + CP1 / T12 < 0.1. By controlling f1 / R1 + CP1 / T12 within a reasonable range, the positions of the first lens and the second lens can be controlled, further restricting the installation positions of the two lenses in the lens barrel, improving the stability of the imaging lens assembly, reducing the field curvature variation of the outer field of view, and also controlling the air gap between the first lens and the second lens within a reasonable range to improve the phenomenon of peak drop and enhance the performance of the imaging lens.

[0062] In this embodiment, the effective focal length f4 of the fourth lens, the inner diameter d0m of the image-side end face of the lens barrel, the inner diameter d3m of the image-side end face of the third support member, and the distance SAG41 on the optical axis from the intersection of the object side face of the fourth lens and the optical axis to the maximum effective semi-aperture of the object side face of the fourth lens satisfy: 4.5 < f4 / (d0m / d3m) / SAG41 < 6.5. Controlling f4 / (d0m / d3m) / SAG41 within a reasonable range can control the surface shape of the object side face of the fourth lens, limit the deflection angle of the principal ray when passing through the fourth lens, and reduce the generation of stray light. At the same time, the inner diameter of the image-side end face of the lens barrel can be further used to optimize the stray light and improve the imaging quality.

[0063] In this embodiment, the air gap T12 between the first lens and the second lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, the maximum thickness CP1 of the first support member, and the maximum thickness CP3 of the third support member satisfy: 1.0 < (T12 + T34) / (CP1 + CP3) < 40.5. Controlling (T12 + T34) / (CP1 + CP3) within a reasonable range can control the thicknesses of the first support member and the third support member and the relative positions of the second lens and the fourth lens with respect to the first lens and the third lens, which is beneficial to configuring the distances between the lenses and the sizes of the lenses, further miniaturizing the height and volume of the imaging lens. At the same time, when the thicknesses of the first support member and the third support member are within a reasonable range, it is beneficial to the assembly of the imaging lens and improves the assembly stability. Preferably, 1.0 < (T12 + T34) / (CP1 + CP3) < 5.5

[0064] In this embodiment, the distance SAG31 on the optical axis from the intersection of the object side face of the third lens and the optical axis to the maximum effective semi-aperture of the object side face of the third lens, the distance SAG32 on the optical axis from the intersection of the image side face of the third lens and the optical axis to the maximum effective semi-aperture of the image side face of the third lens, and the interval distance EP23 between the second support member and the third support member in the optical axis direction satisfy: 0 < (SAG31 - SAG32) / EP23 < 1.7. By controlling the sag heights of the object side and the image side of the third lens and the edge thickness of the third lens, while ensuring that the ratio of the edge thickness to the center thickness of the third lens is within the design range, and at the same time limiting the sag heights on both sides to ensure that the lens will not be too curved or have a large-bellied lens situation, which is beneficial to the processing and forming of the third lens.

[0065] In this embodiment, the lens with positive optical power in the lens group is a positive lens, and the positive and negative signs of the curvature radius of the object side face of the positive lens and the curvature radius of the image side face of the positive lens are opposite. Setting one side of the lens with positive optical power as a convex surface is beneficial to refracting the light passing through the positive lens, so as to reduce the overall optical length of the imaging lens.

[0066] In this embodiment, the lens with negative optical power in the lens group is a negative lens, and the refractive index of the negative lens is less than 1.6. Controlling the refractive index of the negative lens is beneficial for reasonably diverging the converged light rays, thereby achieving a large field of view, but it will not refract the light rays into the optical structure area due to excessive refractive index, effectively reducing the generation of stray light.

[0067] Second Implementation Method

[0068] like Figures 1 to 20 As shown, the imaging lens includes a lens barrel, a lens group, and multiple support members. The lens group is disposed within the lens barrel and includes a first lens, a second lens, a third lens, and a fourth lens sequentially from the object side to the image side along the optical axis. The refractive indices of the second and third lenses are both greater than 1.63. The support members are disposed within the lens barrel and contact the lens portions within the lens group. The multiple support members include a first support member disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens, and a support member disposed on the image side of the second lens and in contact with the image side surface of the second lens. The second support member, which is at least partially in contact with the image-side surface of the lens, and the third support member, which is disposed on the image-side surface of the third lens and at least partially in contact with the image-side surface of the third lens, have an inner diameter greater than 2.2 mm for both the object-side surface and the image-side surface of the second support member; the outer diameter D3m of the image-side surface of the third support member, the inner diameter d3m of the image-side surface of the third support member, the outer diameter D3s of the object-side surface of the third support member, the inner diameter d3s of the object-side surface of the third support member, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy the following: 3.2 mm. -1 <(D3m / d3m+D3s / d3s) / T34<5.2mm -1 .

[0069] Because the inner diameter of the second support member in this application is greater than 2.2 mm, the support area of ​​the second support member is relatively small for miniaturized imaging lenses, which can easily lead to poor stability of the imaging lens. This application controls the support area of ​​the object-side and image-side of the third support member by controlling the relationship between D3m, d3m, D3s, d3s, and T34, ensuring the length of the non-effective diameter portions of the second and third lenses, facilitating stable support between the lenses and the support member. Simultaneously, it ensures a uniform transition of the outer wall surface of the lens barrel at the positions of the second and third lenses, which is beneficial for the shaping of the lens barrel. Furthermore, the length of the lens barrel is matched with the design of the incident light within the lens group, ensuring the thickness of the third support member without obstructing the imaging light, thereby improving the stability of the imaging lens assembly.

[0070] Optionally, the imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The imaging lens in this application may employ multiple lenses, such as the four lenses described above. By rationally allocating the effective focal length, surface shape, center thickness of each lens, and on-axis distance between each lens, the aperture of the imaging lens can be effectively increased, the sensitivity of the lens reduced, and the manufacturability of the lens improved, making the imaging lens more suitable for manufacturing and processing and applicable to portable electronic devices such as smartphones.

[0071] Preferably, the imaging lens in this application is suitable for infrared imaging.

[0072] In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0073] However, those skilled in the art will understand that the number of lenses constituting the imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although four lenses have been described as an example in the embodiments, the imaging lens is not limited to including four lenses. If necessary, the imaging lens may also include other numbers of lenses.

[0074] Figure 1 A schematic diagram of the structure of an imaging lens of this application is shown. Figure 1 The accompanying drawings also indicate parameters such as d0m, d1s, and D2m to provide a clear and intuitive understanding of their meaning. To facilitate the demonstration of the imaging lens structure and specific surface shape, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0075] Where Dis refers to the outer diameter of the object side surface of the i-th support member, dis refers to the inner diameter of the object side surface of the i-th support member, Dim refers to the outer diameter of the image side surface of the i-th support member, dim refers to the inner diameter of the image side surface of the i-th support member, CPi refers to the maximum thickness of the i-th support member, which is also the maximum distance along the optical axis from the object side surface to the image side surface of the i-th support member, and EPij refers to the distance along the optical axis between the image side surface of the i-th support member and the object side surface of the j-th support member, where i and j are positive integers greater than or equal to 1. d0s is the inner diameter of the object side end face of the lens barrel, and D0m is the outer diameter of the image side end face of the lens barrel. The maximum height L of the lens barrel P0 refers to the maximum distance along the optical axis from the object side end face to the image side end face of the lens barrel P0.

[0076] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of imaging lenses applicable to the above embodiments.

[0077] It should be noted that any one of the following embodiments, from Embodiment 1 to Embodiment 9, is applicable to all implementation methods of this application.

[0078] Example 1

[0079] like Figures 2 to 5 The image lens of Embodiment 1 of this application is shown in the figure.

[0080] like Figure 2 As shown, the imaging lens includes, in sequence from the object side to the image side, a first lens E1, a first support P1, a second lens E2, a second support P2, a third lens E3, a third support P3, a third auxiliary support P3b, and a fourth lens E4.

[0081] like Figure 2 As shown, the object-side surface of the first lens is S1, the image-side surface of the first lens is S2, the object-side surface of the second lens is S3, the image-side surface of the second lens is S4, the object-side surface of the third lens is S5, the image-side surface of the third lens is S6, the object-side surface of the fourth lens is S7, and the image-side surface of the fourth lens is S8.

[0082] Table 1 shows the basic structural parameters of the imaging lens in Embodiment 1, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0083] Face number face shape radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO aspherical 18.0528 0.3663 1.544 56.0 71.0800 S1 aspherical 2.3646 1.2674 1.9170 S2 spherical endless 0.1345 S3 aspherical 200.0000 0.5144 1.661 20.4 0.0000 S4 aspherical -3.6225 0.0729 1.2645 S5 aspherical 4.1141 1.1430 1.64 23.5 0.1278 S6 aspherical -2.2297 0.9973 0.7129 S7 aspherical -50.0000 0.6880 1.544 56.0 0.0000 S8 aspherical 4.1291 0.3000 -44.8047 S9 spherical endless 0.2100 1.517 64.2 S10 spherical endless 0.2743 S11 spherical endless

[0084] Table 1

[0085] Table 1 also shows the object side surface S9, the image side surface S10, and the imaging surface S11 of the filter.

[0086] In this embodiment, the object-side and image-side surfaces of the first to fourth lenses are both aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0087]

[0088] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror in this embodiment.

[0089] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.69E-01 -6.61E-02 -1.08E-02 3.96E-02 -3.59E-02 1.74E-02 -4.83E-03 7.42E-04 -4.96E-05 S2 2.75E-01 -2.50E-01 1.09E+00 -2.92E+00 4.53E+00 -4.20E+00 2.27E+00 -6.63E-01 8.07E-02 S3 -5.97E-02 2.40E-01 -1.34E+00 3.80E+00 -6.42E+00 6.29E+00 -3.29E+00 6.91E-01 1.04E-02 S4 -2.04E-02 -1.54E-01 7.84E-01 -2.22E+00 3.66E+00 -3.75E+00 2.34E+00 -8.18E-01 1.23E-01 S5 -2.21E-02 2.20E-02 -7.45E-03 -3.18E-02 5.14E-02 -3.64E-02 1.39E-02 -2.65E-03 1.92E-04 S6 1.79E-02 -8.56E-02 2.89E-01 -5.31E-01 6.08E-01 -4.38E-01 1.93E-01 -4.75E-02 5.02E-03 S7 -1.26E-01 -2.84E-01 5.92E-01 -8.54E-01 8.25E-01 -5.29E-01 2.29E-01 -6.08E-02 7.24E-03 S8 1.54E-01 -4.28E-01 5.87E-01 -5.42E-01 3.35E-01 -1.36E-01 3.46E-02 -4.98E-03 3.09E-04

[0090] Table 2

[0091] Figure 3 The on-axis chromatic aberration curve of the imaging lens in Embodiment 1 is shown, indicating the focal point deviation of light of different wavelengths after passing through the imaging lens. Figure 3 It can be seen that the imaging lens in this embodiment is applicable to infrared light, preferably to light in the 920nm to 960nm band. When imaging in the 920nm to 960nm band, the on-axis chromatic aberration of the imaging lens is small and the imaging quality is high. Figure 4 The astigmatism curve of the imaging lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 5 The magnification chromatic aberration curve of the 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 imaging lens.

[0092] according to Figures 3 to 5 As can be seen, the imaging lens given in Example 1 can achieve good imaging quality.

[0093] Example 2

[0094] The difference from Embodiment 1 is that the parameters of the lens barrel P0 and the support component are different.

[0095] like Figure 6 The image lens of Embodiment 2 of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0096] In Embodiment 2, the curvature radius, center thickness, and other parameters of the first to fourth lenses of the imaging lens are the same as those in Embodiment 1, as are the inter-lens spacing and higher-order image coefficients, as shown in Tables 1 and 2. However, the parameters such as the lens barrel P0, the thickness of the bearing member, the inner and outer diameters of the bearing member, the distance between the bearing members, and the edge thickness of the lenses are different. Therefore, the imaging quality of the imaging lens in this embodiment is as follows: Figures 3 to 5 As shown.

[0097] like Figure 6 As shown, this embodiment also includes a second auxiliary support member P2b.

[0098] Example 3

[0099] The difference from Embodiment 1 is that the parameters of the lens barrel P0 and the support component are different.

[0100] like Figure 7 The image lens of Embodiment 3 of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0101] In Embodiment 3, the curvature radius, center thickness, and other parameters of the first to fourth lenses of the imaging lens are the same as those in Embodiment 1, as are the inter-lens spacing and higher-order image coefficients, as shown in Tables 1 and 2. However, the parameters such as the lens barrel P0, the thickness of the bearing member, the inner and outer diameters of the bearing member, the distance between the bearing members, and the edge thickness of the lenses are different. Therefore, the imaging quality of the imaging lens in this embodiment is as follows: Figures 3 to 5 As shown.

[0102] like Figure 7 As shown, this embodiment also includes a first auxiliary support member P1b.

[0103] Example 4

[0104] The difference from Embodiment 1 is that the parameters of the lens barrel P0, the support member, and the lens are different.

[0105] like Figures 8 to 11 The image lens of Embodiment 4 of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0106] like Figure 8 As shown, the imaging lens includes, in sequence from the object side to the image side, a first lens E1, a first support P1, a second lens E2, a second support P2, a third lens E3, a third support P3, a third auxiliary support P3b, and a fourth lens E4.

[0107] Table 3 shows the basic structural parameters of the imaging lens in Embodiment 4, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0108] Face number face shape radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO aspherical 1.7134 0.3000 1.544 56.0 0.0919 S1 aspherical 0.9034 0.6182 -0.2215 S2 spherical endless 0.1775 S3 aspherical 49.1190 0.6594 1.661 20.4 22.0278 S4 aspherical -3.2150 0.0656 0.1680 S5 aspherical 2.5180 1.9000 1.64 23.5 0.4769 S6 aspherical -1.9936 0.6564 -0.2536 S7 aspherical -4.0869 0.3833 1.544 56.0 5.1422 S8 aspherical 6.2926 0.3000 8.4077 S9 spherical endless 0.2100 1.517 64.2 S10 spherical endless 0.3184 S11 spherical endless

[0109] Table 3

[0110] In this embodiment, the object-side surface and image-side surface of the first to fourth lenses are both aspherical, and the surface shape of each aspherical lens can be defined by, but is not limited to, the formula (1) in Embodiment 1.

[0111] Table 4 provides the higher-order coefficients that can be used for each aspherical mirror in this embodiment.

[0112]

[0113]

[0114] Table 4

[0115] Figure 9 The on-axis chromatic aberration curve of the imaging lens in Embodiment 4 is shown, indicating the focal point deviation of light of different wavelengths after passing through the imaging lens. Figure 9It can be seen that the imaging lens in this embodiment is applicable to infrared light, preferably to light in the 920nm to 960nm band. When imaging in the 920nm to 960nm band, the on-axis chromatic aberration of the imaging lens is small and the imaging quality is high. Figure 10 The astigmatism curve of the imaging lens of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 11 The magnification chromatic aberration curve of the imaging lens of Embodiment 4 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the imaging lens.

[0116] according to Figures 9 to 11 It can be seen that the imaging lens given in Example 4 can achieve good imaging quality.

[0117] Example 5

[0118] The difference from Embodiment 4 is that the parameters of the lens barrel P0 and the support component are different.

[0119] like Figure 12 The image lens of Embodiment 5 of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0120] In Embodiment 5 and Embodiment 4, the parameters such as the radius of curvature, center thickness, inter-lens spacing, and higher-order image coefficients of the imaging lens are the same, as shown in Tables 3 and 4. However, the parameters such as the lens barrel P0, the thickness of the bearing member, the inner and outer diameters of the bearing member, the distance between the bearing members, and the edge thickness of the lens are different. Therefore, the imaging quality of the imaging lens in this embodiment is as follows: Figures 9 to 11 As shown.

[0121] like Figure 12 As shown, in this embodiment, there is no third auxiliary support member P3b, but there is a second auxiliary support member P2b.

[0122] Example 6

[0123] The difference from Embodiment 4 is that the parameters of the lens barrel P0 and the support component are different.

[0124] like Figure 13 The image lens of Embodiment Six of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment One are omitted.

[0125] In Embodiment Six and Embodiment Four, the curvature radius, center thickness, and other parameters of the first to fourth lenses of the imaging lens, as well as the spacing between the lenses and the higher-order image coefficients, are the same, as shown in Tables 3 and 4. However, the parameters such as the lens barrel P0, the thickness of the bearing member, the inner diameter and outer diameter of the bearing member, the distance between the bearing members, and the edge thickness of the lenses are different. Therefore, the imaging quality of the imaging lens in this embodiment is as follows: Figures 9 to 11 As shown.

[0126] like Figure 13 As shown, there is no third auxiliary support P3b in this embodiment.

[0127] Example 7

[0128] The difference from Embodiment 1 is that the parameters of the lens barrel P0, the support member, and the lens are different.

[0129] like Figures 14 to 17 The image lens of Embodiment Seven of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment One are omitted.

[0130] like Figure 14 As shown, the imaging lens includes, in sequence from the object side to the image side, a first lens E1, a first support P1, a second lens E2, a second support P2, a third lens E3, a third support P3, and a fourth lens E4.

[0131] Table 5 shows the basic structural parameters of the imaging lens in Embodiment 7, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0132] Face number face shape radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO aspherical 1.8429 0.3000 1.544 56.0 0.1376 S1 aspherical 0.8960 0.6837 -0.2500 S2 spherical endless 0.2318 S3 aspherical 38.6825 0.7207 1.661 20.4 18.8739 S4 aspherical -3.1948 0.0612 -0.4455 S5 aspherical 2.4189 1.9000 1.64 23.5 0.3987 S6 aspherical -2.0847 0.6176 -0.2453 S7 aspherical -4.9178 0.3984 1.544 56.0 5.8801 S8 aspherical 6.3682 0.3000 9.6879 S9 spherical endless 0.2100 1.517 64.2 S10 spherical endless 0.3541 S11 spherical endless

[0133] Table 5

[0134] In this embodiment, the object-side surface and image-side surface of the first to fourth lenses are both aspherical, and the surface shape of each aspherical lens can be defined by, but is not limited to, the formula (1) in Embodiment 1.

[0135] Table 6 provides the higher-order coefficients that can be used for each aspherical mirror in this embodiment.

[0136]

[0137]

[0138] Table 6

[0139] Figure 15 The on-axis chromatic aberration curve of the imaging lens of Embodiment Seven is shown, which indicates the focal point deviation of light of different wavelengths after passing through the imaging lens. Figure 15It can be seen that the imaging lens in this embodiment is applicable to infrared light, preferably to light in the 920nm to 960nm band. When imaging in the 920nm to 960nm band, the on-axis chromatic aberration of the imaging lens is small and the imaging quality is high. Figure 16 The astigmatism curve of the imaging lens of Embodiment 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 17 The magnification chromatic aberration curve of the imaging lens of Embodiment 7 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the imaging lens.

[0140] according to Figures 15 to 17 It can be seen that the imaging lens given in Example 7 can achieve good imaging quality.

[0141] Example 8

[0142] The difference from Embodiment 7 is that the parameters of the lens barrel P0 and the support component are different.

[0143] like Figure 18 The image lens of Embodiment Eight of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment One are omitted.

[0144] In Embodiment 8 and Embodiment 7, the parameters such as the radius of curvature, center thickness, inter-lens spacing, and higher-order image coefficients of the imaging lens are the same, as shown in Tables 5 and 6. However, the parameters such as the lens barrel P0, the thickness of the bearing member, the inner and outer diameters of the bearing member, the distance between the bearing members, and the edge thickness of the lens are different. Therefore, the imaging quality of the imaging lens in this embodiment is as follows: Figures 15 to 17 As shown.

[0145] Example 9

[0146] The difference from Embodiment 7 is that the parameters of the lens barrel P0 and the support component are different.

[0147] like Figure 19 The image lens of Embodiment Nine of this application is described below. For the sake of brevity, descriptions similar to those in Embodiment One are omitted.

[0148] In Embodiment 9 and Embodiment 7, the parameters such as the radius of curvature, center thickness, inter-lens spacing, and higher-order image coefficients of the imaging lens are the same, as shown in Tables 5 and 6. However, the parameters such as the lens barrel P0, the thickness of the bearing member, the inner and outer diameters of the bearing member, the distance between the bearing members, and the edge thickness of the lens are different. Therefore, the imaging quality of the imaging lens in this embodiment is as follows: Figures 15 to 17 As shown.

[0149] In summary, Examples 1 to 9 satisfy the relationships shown in Table 7.

[0150]

[0151]

[0152] Table 7

[0153] Table 8 shows some parameters of the imaging lenses for Examples 1 to 9.

[0154] Structural parameters (mm) / Example 1 2 3 4 5 6 7 8 9 d1s 2.429 2.331 2.328 1.745 1.745 1.745 1.685 1.924 1.685 d1m 2.017 2.017 2.032 1.745 1.745 1.745 1.685 2.270 1.685 d2s 2.493 2.412 2.405 2.538 2.537 2.556 2.614 2.614 2.678 d2m 2.840 2.774 2.843 3.153 3.153 3.153 3.455 3.455 3.455 D2s 4.750 4.904 4.753 3.556 3.537 3.556 3.633 3.633 3.633 D2m 4.860 4.977 4.863 3.763 3.799 3.763 3.840 3.840 3.840 d3s 2.895 2.883 2.843 2.966 2.966 2.856 3.090 3.001 3.090 d3m 2.769 2.788 2.813 2.869 2.818 2.856 2.945 3.001 2.901 D3s 4.866 4.983 4.870 4.287 4.287 4.520 4.355 4.597 4.355 D3m 5.060 5.177 5.063 4.284 4.248 4.520 4.360 4.597 4.360 d0m 5.661 5.765 5.664 4.683 4.683 4.683 4.751 4.751 4.751 D0s 5.779 5.897 5.782 4.830 4.830 4.830 4.608 4.608 4.608 D0m 6.230 6.347 6.233 5.280 5.280 5.280 5.357 5.357 5.357 CP1 0.446 0.496 0.437 0.018 0.018 0.018 0.018 0.365 1.005 CP2 0.669 0.018 0.561 0.968 0.950 0.968 1.088 1.088 0.497 EP23 0.431 1.055 0.441 1.110 1.128 1.224 1.005 1.005 1.139 CP3 0.832 0.832 0.758 0.303 0.321 0.018 0.274 0.018 0.292

[0155] Table 8

[0156] Table 9 shows the effective focal lengths of the first to fourth lenses of the imaging lenses in Embodiments 1 to 9.

[0157]

[0158]

[0159] Table 9

[0160] 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 imaging lens described above.

[0161] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0162] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0163] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0164] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An imaging lens, characterized in that, include: Lens tube; A lens group is disposed within the lens barrel. The lens group consists of only four lenses with optical power. The lens group includes a first lens, a second lens, a third lens, and a fourth lens sequentially from the object side to the image side along the optical axis. The refractive indices of the second lens and the third lens are both greater than 1.

63. The first lens has negative optical power, with a convex object side and a concave image side. The second lens has positive optical power, with a convex object side and a convex image side. The third lens has positive optical power, with a convex object side and a convex image side. The fourth lens has negative optical power, with a concave object side and a concave image side. Multiple support members are disposed within the lens barrel and in contact with the lens portion within the lens group. The multiple support members include a first support member disposed on the image side of the first lens and in at least partial contact with the image side surface of the first lens, a second support member disposed on the image side of the second lens and in at least partial contact with the image side surface of the second lens, and a third support member disposed on the image side of the third lens and in at least partial contact with the image side surface of the third lens. The inner diameter of the object side surface and the image side surface of the second support member is greater than 2.2 mm. The inner diameter d2s of the object-side surface of the second support member, the inner diameter d1m of the image-side surface of the first support member, the radius of curvature R3 of the object-side surface of the second lens, and the Abbe number V2 of the second lens satisfy the following condition: 0.12 mm. -1 ≤(d2s / d1m) / (R3 / V2)≤0.84mm -1 ; The inner diameter d2m of the image side of the second support member, the inner diameter d3s of the object side of the third support member, the radius of curvature R5 of the object side of the third lens, and the radius of curvature R6 of the image side of the third lens satisfy the following: -0.06≤(d2m-d3s) / (R5+R6)≤1.36; The outer diameter D2m of the image side of the second support member, the outer diameter D2s of the object side of the second support member, the center thickness CT3 of the third lens, and the center thickness CT2 of the second lens satisfy the following condition: 3.24≤D2m / D2s+CT3 / CT2≤3.96; The effective focal length f1 of the first lens, the radius of curvature R1 of the object side surface of the first lens, the maximum thickness CP1 of the first support member, and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following: -2.37≤f1 / R1+CP1 / T12<0.

1.

2. The imaging lens according to claim 1, characterized in that, The distance TD between the object side of the first lens and the image side of the fourth lens on the optical axis, and the outer diameter D0m of the image side end face of the lens barrel and the outer diameter D0s of the object side end face of the lens barrel satisfy the following: 6.56≤TD / (D0m-D0s)≤11.

51.

3. The imaging lens according to claim 1, characterized in that, The maximum thickness CP2 of the second support member, the air gap T23 between the second lens and the third lens on the optical axis, and the combined focal length f23 of the second lens and the third lens satisfy the following condition: 0.05≤(CP2+T23) / f23≤0.

68.

4. The imaging lens according to claim 1, characterized in that, The outer diameter D3m of the image-side surface of the third support member, the inner diameter d3m of the image-side surface of the third support member, the outer diameter D3s of the object-side surface of the third support member, the inner diameter d3s of the object-side surface of the third support member, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy the following: 3.52mm. -1 ≤(D3m / d3m+D3s / d3s) / T34≤4.96mm -1 .

5. The imaging lens according to claim 1, characterized in that, The radius of curvature of the fourth lens is less than zero. The radius of curvature R6 of the image side of the third lens, the inner diameter d3s of the object side of the third support member, the inner diameter d3s of the image side of the third support member, and the radius of curvature R7 of the object side of the fourth lens satisfy the following: -1.4≤R6 / d3s+d3m / R7≤-0.

83.

6. The imaging lens according to claim 1, characterized in that, The inner diameter d2s of the object side of the second support member, the inner diameter d1s of the object side of the first support member, the radius of curvature R3 of the object side of the second lens, and the radius of curvature R4 of the image side of the second lens satisfy the following condition: 1.04≤d2s / d1s+|R4 / R3|≤1.

67.

7. The imaging lens according to claim 1, characterized in that, The inner diameter d3s of the object side of the third support member, the center thickness CT3 of the third lens, and the refractive index N3 of the third lens satisfy the following condition: 2.46≤d3s / (CT3 / N3)≤4.

15.

8. The imaging lens according to claim 1, characterized in that, The effective focal length f3 of the third lens, the effective focal length f of the imaging lens, and the spacing EP23 between the second support member and the third support member in the optical axis direction satisfy the following condition: 0.85mm. -1 ≤f3 / f / EP23≤2.97mm -1 .

9. The imaging lens according to claim 1, characterized in that, The inner diameter d0m of the image-side end face of the lens barrel, the combined focal length f23 of the second lens and the third lens, and half of the maximum field of view (Semi-FOV) of the imaging lens satisfy the following condition: 4.55≤d0m / (f23 / tan(Semi-FOV)≤5.

38.

10. The imaging lens according to claim 1, characterized in that, The effective focal length f4 of the fourth lens, the inner diameter d0m of the image-side end face of the lens barrel, the inner diameter d3m of the image-side end face of the third support member, and the distance SAG41 from the intersection of the object-side surface of the fourth lens and the optical axis to the maximum effective half-aperture of the object-side surface of the fourth lens on the optical axis satisfy the following condition: 4.78≤f4 / (d0m / d3m) / SAG41≤6.

22.

11. The imaging lens according to claim 1, characterized in that, The air gap T12 between the first lens and the second lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, and the maximum thickness CP1 of the first support member and the maximum thickness CP3 of the third support member satisfy the following: 1.18≤(T12+T34) / (CP1+CP3)≤40.

34.

12. The imaging lens according to any one of claims 1 to 11, characterized in that, The distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the maximum effective half-aperture of the object side surface of the third lens on the optical axis, the distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the maximum effective half-aperture of the image side surface of the third lens on the optical axis, and the interval EP23 between the second support member and the third support member in the optical axis direction satisfy the following: 0.59≤(SAG31-SAG32) / EP23≤1.

59.

13. The imaging lens according to any one of claims 1 to 11, characterized in that, The lens in the lens group that has positive optical power is a positive lens, and the radius of curvature of the object side of the positive lens has the opposite sign to the radius of curvature of the image side of the positive lens.

14. The imaging lens according to any one of claims 1 to 11, characterized in that, The lens in the lens group that has negative optical power is a negative lens, and the refractive index of the negative lens is less than 1.6.

Images