Imaging lens

Abstract

The application provides an imaging lens. The imaging lens comprises a lens barrel and a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in the lens barrel, and further comprises a plurality of abutting members, wherein the plurality of abutting members at least comprises a third abutting member and a fourth abutting member, the refractive index of the third lens is less than 1.54; the combination focal length f34 of the third lens and the fourth lens, the object side inner diameter d4s of the fourth abutting member, the object side inner diameter d3s of the third abutting member, the refractive index N4 of the fourth lens and the refractive index N3 of the third lens satisfy: -13.0 < f34 / (d4s-d3s) / (N4 / N3) < -22.0; the curvature radius R5 of the object side surface of the third lens, the curvature radius R8 of the image side surface of the fourth lens and the maximum thickness CP3 of the third abutting member along the optical axis direction satisfy: 0.1 mm < |R5 / R8|*CP3 < 3.5 mm. The application solves the problems of poor stability and poor MTF performance of the imaging lens in the prior art.

Description

Technical Field

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

[0002] In recent years, with the rapid development of smart terminal products such as mobile phones and tablets, shooting functions have become an increasingly competitive field for manufacturers. As the shooting requirements of imaging lenses used in mobile phones continue to increase, the improvement of imaging lens performance has also put forward new requirements for the stability of imaging lens production.

[0003] Currently, the most commonly used imaging lenses on the market are still those composed of six elements. To achieve a large image size, traditional six-element lenses typically have a large curvature in the third, fourth, and fifth elements to refract light and improve image height. However, lenses with large curvature and thickness are difficult to manufacture, affecting the stability of the imaging lens and the final image performance. The assembly stability of the middle lens in a six-element imaging lens is crucial to ensuring overall performance stability. Furthermore, the middle lens is usually more sensitive, and its edges are prone to generating stray light, which can easily lead to poor MTF (Mean Transmission Frequency) performance in the final imaging lens.

[0004] In other words, existing imaging lenses suffer from poor stability and poor MTF performance. Summary of the Invention

[0005] The main objective of this invention is to provide an imaging lens to solve the problems of poor stability and poor MTF performance in existing imaging lenses.

[0006] To achieve the above object, the present invention provides an imaging lens, comprising a lens barrel, and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged in the lens barrel from the object side to the image side. The image side surface of the fourth lens has at least one inflection point, and the object side surface and the image side surface of the sixth lens each have at least one inflection point. The imaging lens further includes a plurality of abutting members, and the plurality of abutting members at least include a third abutting member and a fourth abutting member. The third abutting member is located on the image side of the third lens and is partially abutted against the third lens, and the fourth abutting member is located on the image side of the fourth lens and is partially abutted against the fourth lens; the refractive index of the third lens is less than 1.54; the combined focal length f34 of the third lens and the fourth lens, the object side inner diameter d4s of the fourth abutting member, the object side inner diameter d3s of the third abutting member, the refractive index N4 of the fourth lens, and the refractive index N3 of the third lens satisfy: -13.0 < f34 / (d4s - d3s) / (N4 / N3) < -22.0; the curvature radius R5 of the object side surface of the third lens, the curvature radius R8 of the image side surface of the fourth lens, and the maximum thickness CP3 of the third abutting member in the optical axis direction satisfy: 0.1mm < |R5 / R8| CP3 < 3.5mm.

[0007] The present invention also provides an imaging lens, comprising a lens barrel, and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged in the lens barrel from the object side to the image side. The image side surface of the fourth lens has at least one inflection point, and the object side surface and the image side surface of the sixth lens each have at least one inflection point. The imaging lens further includes a plurality of abutting members, and the plurality of abutting members at least include a third abutting member and a fourth abutting member. The third abutting member is located on the image side of the third lens and is partially abutted against the third lens, and the fourth abutting member is located on the image side of the fourth lens and is partially abutted against the fourth lens; the refractive index of the third lens is less than 1.54; the curvature radius of the object side surface of the fourth lens is greater than zero, and the curvature radius R6 of the image side surface of the third lens, the curvature radius R7 of the object side surface of the fourth lens, the object side inner diameter d4s of the fourth abutting member, and the object side inner diameter d3s of the third abutting member satisfy: -0.5 < (R6 + R7) / (d4s + d3s) < 2.0; the effective focal length f3 of the third lens, the central thickness CT3 of the third lens, the curvature radius R8 of the image side surface of the fourth lens, and the image side inner diameter d3m of the third abutting member satisfy: 68.0 < f3 / CT3 + R8 / d3m < 78.0.

[0008] The present invention also provides an imaging lens, comprising a lens barrel and, sequentially arranged from the object side to the image side, a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power. The image side of the fourth lens has at least one inflection point, and the object side and image side of the sixth lens each have at least one inflection point. The imaging lens further comprises a plurality of support members, including at least a third support member and a fourth support member. The third support member is located on the image side of the third lens and partially abuts against the third lens, and the fourth support member is located on the image side of the fourth lens and partially abuts against the fourth lens. The refractive index of the third lens is less than 1.54. The maximum thickness CP4 of the fourth support member along the optical axis, the maximum thickness CP3 of the third support member along the optical axis, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy the following: -3.5 < (CP4 / CP3) / (f3 / f4) < -2.5.

[0009] Furthermore, the radius of curvature of the object side of the fourth lens is greater than zero, and the radius of curvature R6 of the image side of the third lens, the radius of curvature R7 of the object side of the fourth lens, the inner diameter d4s of the object side of the fourth support member and the inner diameter d3s of the object side of the third support member satisfy the following: -0.5<(R6+R7) / (d4s+d3s)<2.0.

[0010] Furthermore, the effective focal length f3 of the third lens, the center thickness CT3 of the third lens, the radius of curvature R8 of the image-side surface of the fourth lens, and the image-side inner diameter d3m of the third support member satisfy the following condition: 68.0 <f3 / CT3+R8 / d3m<78.0。

[0011] Furthermore, the maximum thickness CP4 of the fourth support member along the optical axis, the maximum thickness CP3 of the third support member along the optical axis, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy the following condition: -3.5 < (CP4 / CP3) / (f3 / f4) < -2.5.

[0012] Furthermore, the plurality of supporting components also includes a sixth supporting component, which is located on the image side of the sixth lens and partially abuts against the sixth lens. The radius of curvature of the object side of the sixth lens is greater than zero. The radius of curvature R11 of the object side of the sixth lens, the radius of curvature R12 of the image side of the sixth lens, the maximum thickness CP6 of the sixth supporting component along the optical axis, and the center thickness CT6 of the sixth lens satisfy the following: 5.0mm < (R11 + R12) / (CP6 / CT6) < 8.0mm.

[0013] Furthermore, the combined focal length f34 of the third and fourth lenses, the effective focal length f of the imaging lens, and the object-side outer diameter D3s of the third support member and the image-side outer diameter D0m of the lens barrel satisfy the following relationship: -4.0 <f34 / f+D3s / D0m<-6.7。

[0014] Furthermore, the distance EP34 between the third and fourth support members along the optical axis, the center thickness CT4 of the fourth lens, and the Abbe number V4 of the fourth lens satisfy the following condition: 23.5 <EP34 / CT4 V4<27.5.

[0015] Furthermore, the radius of curvature R7 of the object-side surface of the fourth lens, the inner diameter d3m of the image-side surface of the third support member, the radius of curvature R8 of the image-side surface of the fourth lens, and the inner diameter d4m of the image-side surface of the fourth support member satisfy the following relationship: 3.5 <R7 / d3m / (R8 / d4m)<7.0。

[0016] Furthermore, the effective half-aperture DT51 of the object side of the fifth lens, the effective half-aperture DT32 of the image side of the third lens, the outer diameter D4s of the object side of the fourth support member, and the outer diameter D3m of the image side of the third support member satisfy the following condition: 1.0 < (DT51 - DT32) / (D4s - D3m) < 2.0.

[0017] Furthermore, the plurality of bearing members also includes a second bearing member, which is located on the image side of the second lens and partially abuts against the second lens. The center thickness CT3 of the third lens, the distance EP23 between the second bearing member and the third bearing member along the optical axis, the distance EP34 between the third bearing member and the fourth bearing member along the optical axis, and the center thickness CT4 of the fourth lens satisfy the following condition: 1.0 <CT3 / EP23 / (EP34 / CT4)<2.0。

[0018] Furthermore, the distance EP23 between the second and third support members along the optical axis, the center thickness CT3 of the third lens, and the Abbe number V3 of the third lens satisfy the following condition: 64.5. <EP23 / CT3 V3<70.0.

[0019] Furthermore, the imaging lens also includes a first auxiliary support member, which partially abuts against the fourth support member. The object-side outer diameter D4bs of the first auxiliary support member, the image-side outer diameter D4m of the fourth support member, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy the following: 2.9 < (D4bs - D4m) / T45 < 3.5.

[0020] Furthermore, the effective focal length f of the imaging lens, half of the maximum field of view (Semi-FOV) of the imaging lens, the maximum height L of the lens barrel, and the aperture number FNO of the imaging lens satisfy the following relationship: 1.5 <f tan(Semi - FOV) / L FNO < 2.2.

[0021] Furthermore, the distance Yc41 from the critical point near the optical axis of the object - side surface of the fourth lens to the optical axis, the distance Yc42 from the critical point near the optical axis of the image - side surface of the fourth lens to the optical axis, and the distance EP34 between the third support member and the fourth support member along the optical axis satisfy: 1.5 < (Yc41 + Yc42) / EP34 < 2.5.

[0022] Furthermore, the multiple support members further include a first support member and a fifth support member. The first support member is located on the image - side of the first lens and is partially in contact with the first lens. The fifth support member is located on the image - side of the fifth lens and is partially in contact with the fifth lens.

[0023] Applying the technical solution of the present invention, the imaging lens includes a lens barrel and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged in the lens barrel from the object - side to the image - side. The image - side surface of the fourth lens has at least one inflection point. The object - side surface and the image - side surface of the sixth lens each have at least one inflection point. The imaging lens further includes multiple support members. The multiple support members at least include a third support member and a fourth support member. The third support member is located on the image - side of the third lens and is partially in contact with the third lens. The fourth support member is located on the image - side of the fourth lens and is partially in contact with the fourth lens. The refractive index of the third lens is less than 1.54. The combined focal length f34 of the third lens and the fourth lens, the object - side inner diameter d4s of the fourth support member, the object - side inner diameter d3s of the third support member, the refractive index N4 of the fourth lens, and the refractive index N3 of the third lens satisfy: - 13.0 < f34 / (d4s - d3s) / (N4 / N3) < - 22.0. The curvature radius R5 of the object - side surface of the third lens, the curvature radius R8 of the image - side surface of the fourth lens, and the maximum thickness CP3 of the third support member along the optical axis satisfy: 0.1 mm < |R5 / R8| CP3 < 3.5 mm.

[0024] By strategically placing inflection points at appropriate locations on the lenses, especially in the fourth lens which is located in the middle section of the imaging lens, the imaging process of the entire lens is significantly improved. When the third lens uses a low-refractive-index material with a refractive index less than 1.54, further control over the relationship between the combined focal length and refractive index of the third and fourth lenses, the inner diameter of the third and fourth support components, and the relationship between the object-side and image-side curvature radii of the third and fourth lenses and the maximum thickness of the third support component allows for the selection of suitable fourth lens materials to work in conjunction with the third lens to refract light. This controls the focal length and curvature radii of the two lenses, thereby limiting the shape of the central region of both lenses and adjusting the path of light passing through the central region. Furthermore, proper control of the thickness, object-side inner diameter, and fourth support component's object-side inner diameter limits the maximum thickness of the two lens structures and blocks excess light from the edge field of view, thus improving the actual peak value of the imaging lens's edge field of view and ultimately increasing the overall MTF yield of the imaging lens. Attached Figure Description

[0025] 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:

[0026] Figure 1 A schematic diagram of the imaging lens of Example 1 of the present invention in a first state is shown;

[0027] Figure 2 A schematic diagram of the imaging lens of Example 1 of the present invention in a second state is shown;

[0028] Figures 3 to 6 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 1 of the present invention are shown respectively.

[0029] Figure 7 A schematic diagram of the imaging lens of Example 2 of the present invention in a first state is shown;

[0030] Figure 8 A schematic diagram of the imaging lens of Example 2 of the present invention in a second state is shown;

[0031] Figures 9 to 12 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 2 of the present invention are shown respectively.

[0032] Figure 13 A schematic diagram of the imaging lens of Example 3 of the present invention in a first state is shown;

[0033] Figure 14A schematic diagram of the imaging lens of Example 3 of the present invention in a second state is shown;

[0034] Figures 15 to 18 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 3 of the present invention are shown respectively.

[0035] Figure 19 A schematic diagram of the imaging lens of Example 4 of the present invention in a first state is shown;

[0036] Figure 20 A schematic diagram of the imaging lens of Example 4 of the present invention in a second state is shown;

[0037] Figures 21 to 24 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 4 of the present invention are shown respectively.

[0038] Figure 25 A dimensioned diagram of an imaging lens according to an alternative embodiment of the present invention is shown;

[0039] Figure 26 Another dimensioning diagram of the imaging lens of an alternative embodiment of the present invention is shown.

[0040] The above figures include the following reference numerals:

[0041] P0, Lens tube; 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 support member; P2, Second support member; P3, Third support member; P4, Fourth support member; P4b, First auxiliary support member; P5, Fifth support member; P6, Sixth support member. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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 database of optical software) to determine convexity or concavity. For the incident light side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the emitting light side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0048] To address the issues of poor stability and poor MTF performance in existing imaging lenses, this invention provides an imaging lens.

[0049] like Figures 1 to 26As shown, in an optional embodiment of the present application, the imaging lens includes a lens barrel and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged in the lens barrel from the object side to the image side. The image side surface of the fourth lens has at least one inflection point, and the object side surface and the image side surface of the sixth lens each have at least one inflection point. The imaging lens further includes a plurality of supporting members, and the plurality of supporting members at least include a third supporting member and a fourth supporting member. The third supporting member is located on the image side of the third lens and is partially in contact with the third lens. The fourth supporting member is located on the image side of the fourth lens and is partially in contact with the fourth lens; the refractive index of the third lens is less than 1.54; the combined focal length f34 of the third lens and the fourth lens, the object side inner diameter d4s of the fourth supporting member, the object side inner diameter d3s of the third supporting member, the refractive index N4 of the fourth lens, and the refractive index N3 of the third lens satisfy: -13.0 < f34 / (d4s - d3s) / (N4 / N3) < -22.0; the curvature radius R5 of the object side surface of the third lens, the curvature radius R8 of the image side surface of the fourth lens, and the maximum thickness CP3 of the third supporting member along the optical axis direction satisfy: 0.1mm < |R5 / R8| CP3 < 3.5mm.

[0050] By reasonably setting inflection points at reasonable positions of the lenses, especially when the fourth lens is a lens in the middle section of the imaging lens, it plays a crucial role in the imaging process of the entire imaging lens. When the third lens uses a low-refractive-index material with a refractive index less than 1.54, further by controlling the relationship between the combined focal length and refractive index of the third lens and the fourth lens, the inner diameter of the third supporting member, the inner diameter of the fourth supporting member, and the relationship between the curvature radius of the object side surface of the third lens, the curvature radius of the image side surface of the fourth lens, and the maximum thickness of the third supporting member, it is beneficial to select a suitable material for the fourth lens to cooperate with the third lens to refract light, control the focal length and curvature radius of the two lenses, and then limit the shape of the central region of the two lenses. At the same time, the traveling path of the light passing through the central region can be adjusted. Reasonably controlling the thickness, object side inner diameter of the third supporting member, and the object side inner diameter of the fourth supporting member can limit the maximum thickness of the structural regions of the two lenses and block the excess light in the marginal field of view, thereby improving the actual peak value of the marginal field of view of the imaging lens and finally improving the overall MTF yield of the imaging lens.

[0051] In this embodiment, the plurality of supporting members further include a first supporting member and a fifth supporting member. The first supporting member is located on the image side of the first lens and is partially in contact with the first lens. The fifth supporting member is located on the image side of the fifth lens and is partially in contact with the fifth lens.

[0052] In this embodiment, the radius of curvature of the object side surface of the fourth lens is greater than zero, and the following relationship is satisfied among the radius of curvature R6 of the image side surface of the third lens, the radius of curvature R7 of the object side surface of the fourth lens, the inner diameter d4s of the object side of the fourth bearing member, and the inner diameter d3s of the object side of the third bearing member: -0.5 < (R6 + R7) / (d4s + d3s) < 2.0. By controlling the inner diameter of the object side of the third bearing member and the inner diameter of the object side of the fourth bearing member, it is beneficial to control the imaging quality of the light passing through the fourth lens. Reasonably controlling the ratio of the radius of curvature of the third lens and the fourth lens to the inner diameter of the object side of the third bearing member and the inner diameter of the object side of the fourth bearing member can make the light angle of the field of view within a reasonable range and reduce its sensitivity.

[0053] In this embodiment, the plurality of bearing members further includes a sixth bearing member, and the sixth bearing member is located on the image side of the sixth lens and is partially in contact with the sixth lens. The radius of curvature of the object side surface of the sixth lens is greater than zero, and the following relationship is satisfied among the radius of curvature R11 of the object side surface of the sixth lens, the radius of curvature R12 of the image side surface of the sixth lens, the maximum thickness CP6 of the sixth bearing member along the optical axis direction, and the central thickness CT6 of the sixth lens: 5.0 mm < (R11 + R12) / (CP6 / CT6) < 8.0 mm. Reasonably setting the sum of the radii of curvature on both sides of the sixth lens and simultaneously controlling the ratio of the maximum thickness of the sixth bearing member along the optical axis direction to the central thickness of the sixth lens is beneficial to increasing the light incident amount of the sixth lens and the light angle of the edge field of view, and effectively controlling the light of the edge field of view by adjusting the thickness of the sixth bearing member to improve the imaging quality of the imaging lens.

[0054] In this embodiment, the following relationship is satisfied among the effective focal length f3 of the third lens, the central thickness CT3 of the third lens, the radius of curvature R8 of the image side surface of the fourth lens, and the inner diameter d3m of the image side of the third bearing member: 68.0 < f3 / CT3 + R8 / d3m < 78.0. By adjusting the effective focal length of the third lens and the central thickness of the third lens, the rationality of the structure can be ensured and the space of the lens in the lens barrel can be reduced. By reasonably setting the radius of curvature of the image side surface of the fourth lens and the inner diameter of the image side of the third bearing member, it is possible to ensure that while not blocking the effective light, the excess marginal light is blocked from entering the fourth lens to reduce stray light.

[0055] In this embodiment, the following relationship is satisfied among the combined focal length f34 of the third lens and the fourth lens, the effective focal length f of the imaging lens, the outer diameter D3s of the object side of the third bearing member, and the outer diameter D0m of the image side of the lens barrel: -4.0 < f34 / f + D3s / D0m < -6.7. Under the condition of controlling the combined focal length of the third lens and the fourth lens, adjusting the outer diameter of the object side of the third bearing member and the outer diameter of the image side of the lens barrel can effectively control the radial dimension of the imaging lens, improve the forming performance of the lens barrel, and meet the miniaturization of the imaging lens.

[0056] In this embodiment, the distance EP34 between the third bearing member and the fourth bearing member along the optical axis direction, the central thickness CT4 of the fourth lens, and the Abbe number V4 of the fourth lens satisfy: 23.5 < EP34 / CT4 V4 < 27.5. Controlling the distance between the third bearing member and the fourth bearing member restricts the thickness of the bearing area of the fourth lens. Combining the product of the ratio of the thickness of the bearing area of the fourth lens to the central thickness and the Abbe number of the fourth lens, and selecting a suitable material while controlling the thickness ratio between the bearing area and the center of the fourth lens is beneficial to the processing and forming of the fourth lens.

[0057] In this embodiment, the curvature radius R7 of the object side surface of the fourth lens, the image-side inner diameter d3m of the third bearing member, the curvature radius R8 of the image side surface of the fourth lens, and the image-side inner diameter d4m of the fourth bearing member satisfy: 3.5 < R7 / d3m / (R8 / d4m) < 7.0. Controlling the above conditional formula within the range of 3.5 to 7.0 can enable the third bearing member to block the excess light at the edge and then allow the imaging light to enter the fourth lens stably. Controlling the curvature radii of the two side surfaces of the fourth lens can control the light traveling route to a certain extent. Combining with the fourth bearing member can avoid the excess light from being reflected between the lenses to form ghost images and stray light.

[0058] In this embodiment, the effective semi-aperture DT51 of the object side surface of the fifth lens, the effective semi-aperture DT32 of the image side surface of the third lens, the object-side outer diameter D4s of the fourth bearing member, and the image-side outer diameter D3m of the third bearing member satisfy: 1.0 < (DT51 - DT32) / (D4s - D3m) < 2.0. By controlling the ratio of the difference between the effective semi-aperture of the object side surface of the fifth lens and the effective semi-aperture of the image side surface of the third lens to the difference between the object-side outer diameter of the fourth bearing member and the image-side inner diameter of the third bearing member, it is beneficial to control the radial step difference of the imaging lens and prevent the stability of the lens bearing members from being poor due to a large step difference during assembly.

[0059] In this embodiment, the plurality of bearing members further includes a second bearing member. The second bearing member is located on the image side of the second lens and is partially in contact with the second lens. The central thickness CT3 of the third lens, the distance EP23 between the second bearing member and the third bearing member along the optical axis direction, the distance EP34 between the third bearing member and the fourth bearing member along the optical axis direction, and the central thickness CT4 of the fourth lens satisfy: 1.0 < CT3 / EP23 / (EP34 / CT4) < 2.0. By controlling the ratio of the above conditional formula within the range of 1.0 to 2.0, it can ensure that the thickness ratio of the central thickness of the third lens to the maximum thickness of the bearing area and the thickness ratio of the central thickness of the fourth lens to the maximum thickness of the bearing area can be restricted within a reasonable range, which is beneficial to the processing and forming of the third lens and the fourth lens.

[0060] In this embodiment, the distance EP23 between the second and third support members along the optical axis, the center thickness CT3 of the third lens, and the Abbe number V3 of the third lens satisfy the following condition: 64.5. <EP23 / CT3 V3 < 70.0. Controlling the distance between the second and third support components constrains the maximum thickness of the support area of ​​the third lens. Combining the ratio of the thickness of the third lens to its center thickness with the product of the Abbe number of the third lens, and controlling the thickness ratio between the edge and center of the third lens, selecting a suitable material is beneficial for the processing and forming of the third lens.

[0061] In this embodiment, the imaging lens further includes a first auxiliary support member, which partially abuts against a fourth support member. The object-side outer diameter D4bs of the first auxiliary support member, the image-side outer diameter D4m of the fourth support member, and the air gap T45 between the fourth and fifth lenses on the optical axis satisfy the following condition: 2.9 < (D4bs - D4m) / T45 < 3.5. By setting the first auxiliary support member and constraining the object-side outer diameter of the first auxiliary support member and the image-side outer diameter of the fourth support member, the forming stability of the lens barrel is improved, and the imaging quality of the imaging lens is adjusted by adjusting the air gap between the fourth and fifth lenses on the optical axis, ensuring that the imaging of light meets the requirements of the optical system.

[0062] In this embodiment, the maximum thickness CP4 of the fourth support member along the optical axis, the maximum thickness CP3 of the third support member along the optical axis, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy the following condition: -3.5 < (CP4 / CP3) / (f3 / f4) < -2.5. By ensuring the effective focal lengths of the third and fourth lenses, and the maximum thicknesses of the third and fourth support members along the optical axis, the light intensity and light intake of the off-axis field of view can be controlled, ensuring the rationality of the structure and reducing the space of the lens in the lens barrel. This effectively reduces the size of the imaging lens and improves the stability of the imaging lens during use.

[0063] In this embodiment, the effective focal length f of the imaging lens, half of the maximum field of view (Semi-FOV) of the imaging lens, the maximum height L of the lens barrel, and the aperture number FNO of the imaging lens satisfy the following relationship: 1.5 <f tan(Semi-FOV) / L FNO < 2.2. Satisfying this condition allows for effective control of the maximum height of the lens barrel and the field of view of the imaging lens, effectively reducing the overall size of the imaging lens, ensuring the optical performance of the imaging lens, and making it easier to process and mold accessories, as well as facilitating stable assembly.

[0064] In this embodiment, the distance Yc41 from the critical point of the object-side curved surface of the fourth lens closest to the optical axis, the distance Yc42 from the critical point of the image-side curved surface of the fourth lens closest to the optical axis, and the spacing EP34 between the third and fourth support members along the optical axis satisfy the following condition: 1.5 < (Yc41 + Yc42) / EP34 < 2.5. By controlling the distances from the object-side curved surface of the fourth lens closest to the optical axis and the distances from the image-side curved surface of the fourth lens to the optical axis, and adjusting the spacing between the third and fourth support members along the optical axis, the thickness of the support area and the shape of both sides of the fourth lens are constrained, which helps to reduce the internal stray light generated after the light passes through the fourth lens.

[0065] In another optional embodiment of this application, the imaging lens includes a lens barrel and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially disposed in the lens barrel from the object side to the image side. The image side of the fourth lens has at least one inflection point, and the object side and image side of the sixth lens each have at least one inflection point. The imaging lens also includes a plurality of support members, including at least a third support member and a fourth support member. The third support member is located on the image side of the third lens and partially abuts against the third lens, and the fourth support member is located on the image side of the fourth lens and abuts against the fourth lens. The mirrors are in contact; the refractive index of the third lens is less than 1.54; the radius of curvature of the object-side surface of the fourth lens is greater than zero; the radius of curvature R6 of the image-side surface of the third lens, the radius of curvature R7 of the object-side surface of the fourth lens, the object-side inner diameter d4s of the fourth support member, and the object-side inner diameter d3s of the third support member satisfy: -0.5 < (R6 + R7) / (d4s + d3s) < 2.0; the effective focal length f3 of the third lens, the center thickness CT3 of the third lens, the radius of curvature R8 of the image-side surface of the fourth lens, and the image-side inner diameter d3m of the third support member satisfy: 68.0 <f3 / CT3+R8 / d3m<78.0。

[0066] By strategically placing curvature points at appropriate locations on the lenses, especially in the fourth lens which is located in the middle section of the imaging lens, the imaging process is significantly affected. With the third lens using a low-refractive-index material (less than 1.54), further control over the object-side inner diameters of the third and fourth support components helps control the image quality of light passing through the fourth lens. Reasonably controlling the ratio of the curvature radii of the third and fourth lenses to the object-side inner diameters of the third and fourth support components ensures the light angle within the field of view is within a reasonable range, reducing sensitivity. Adjusting the effective focal length and center thickness of the third lens ensures structural rationality and reduces the space occupied by the lenses within the lens barrel. By strategically setting the image-side curvature radius of the fourth lens and the image-side inner diameter of the third support component, excess edge light can be blocked from entering the fourth lens without obstructing effective light, thus reducing stray light.

[0067] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0068] In another optional embodiment of this application, the imaging lens includes a lens barrel and a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power, arranged sequentially from the object side to the image side in the lens barrel. The image side of the fourth lens has at least one inflection point, and the object side and image side of the sixth lens each have at least one inflection point. The imaging lens also includes a plurality of support members, including at least a third support member and a fourth support member. The third support member is located on the image side of the third lens and partially abuts against the third lens, and the fourth support member is located on the image side of the fourth lens and partially abuts against the fourth lens. The refractive index of the third lens is less than 1.54. The maximum thickness CP4 of the fourth support member along the optical axis, the maximum thickness CP3 of the third support member along the optical axis, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy the following: -3.5 < (CP4 / CP3) / (f3 / f4) < -2.5.

[0069] By setting inflection points at appropriate positions on the lenses, especially in the fourth lens which is the middle section of the imaging lens, the imaging process of the entire imaging lens is crucial. With the third lens using a low-refractive-index material with a refractive index of less than 1.54, by further controlling the effective focal length of the third and fourth lenses, as well as the maximum thickness of the third and fourth support members along the optical axis, the light intensity and amount of light entering the off-axis field of view can be controlled. This ensures the rationality of the structure and reduces the space of the lenses in the lens barrel, effectively reducing the size of the imaging lens and improving the stability of the imaging lens during use.

[0070] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0071] Optionally, the imaging lens may also include protective glass for protecting the photosensitive element located on the imaging surface.

[0072] The imaging lens in this application can employ multiple lenses, such as the six lenses described above. 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 the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. By using an aspherical lens, aberrations occurring during imaging 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 six lenses are described as an example in the embodiments, the imaging lens is not limited to including six lenses. If necessary, the imaging lens may also include other numbers of lenses.

[0074] Figure 25 and Figure 26 A schematic diagram of the structure of an imaging lens of this application is shown, wherein Figure 25 The winning bid specifies parameters such as D3m, D3s, d3m, d4s, d4m, D4s, D4m, D4bs, D0m, L, EP23, EP34, CP3, CP4, and CP6. Figure 26 The diagram shows parameters such as Yc41 and Yc42 to clearly and intuitively explain their meaning. For the sake of clarity regarding imaging lenses and specific surface shapes, these parameters will not be shown in the accompanying diagrams when explaining specific examples later.

[0075] 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.

[0076] It should be noted that in the following examples, there are first and second states. In the same example, the curvature radius, center thickness, and other parameters of the imaging lens from the first to the sixth lens, as well as the spacing between the lenses and the higher-order coefficients, are the same in both the first and second states. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first to sixth support members, and the shape of some lenses are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0077] It should be noted that any of the examples one through four below are applicable to all embodiments of this application.

[0078] Example 1

[0079] like Figures 1 to 6 As shown, the imaging lens of Example 1 is described. Figure 1 A schematic diagram of the imaging lens in Example 1 in its first state is shown. Figure 2 A schematic diagram of the imaging lens in Example 1 in the second state is shown.

[0080] like Figures 1 to 2 As shown, the imaging lens includes a lens barrel P0 and the following components arranged sequentially along the optical axis of the lens barrel P0 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 fourth lens E4, a fourth support P4, a first auxiliary support P4b, a fifth lens E5, a fifth support P5, a sixth lens E6, and a sixth support P6.

[0081] like Figure 1 As shown, in the first state of the imaging lens, the first support members P1 to the third support member P3 are all spacers, the fourth support member P4 is a spacer ring, the first auxiliary support member P4b is a spacer, and the sixth support member P6 is a pressure ring. The object-side and image-side of the first support member P1 abut against the image-side S2 of the first lens and the object-side S3 of the second lens, respectively, and the outer periphery of the first support member P1 abuts against the inner wall surface of the lens barrel P0. The object-side and image-side of the second support member P2 abut against the image-side S4 of the second lens and the object-side S5 of the third lens, respectively, and the outer periphery of the second support member P2 abuts against the inner wall surface of the lens barrel P0. The object-side and image-side of the third support member P3 abut against the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively, and the outer periphery of the third support member P3 abuts against the inner wall surface of the lens barrel P0. The object-side and image-side of the fourth support member P4 abut against the image-side S8 of the fourth lens and the object-side of the first auxiliary support member P4b, respectively. The image-side of the first auxiliary support member P4b partially abuts against the object-side S9 of the fifth lens. The outer peripheries of both the fourth support member P4 and the first auxiliary support member P4b abut against the inner wall surface of the lens barrel P0. The object-side and image-side of the fifth support member P5 abut against the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively. The outer periphery of the fifth support member P5 abuts against the inner wall surface of the lens barrel P0. The sixth support member P6 abuts against both the image-side S12 of the sixth lens and the inner wall surface of the lens barrel P0.

[0082] like Figure 2As shown, in the second state of the imaging lens, the first support member P1 to the third support member P3 are all spacers, the fourth support member P4 is a spacer ring, the first auxiliary support member P4b is a spacer, and the sixth support member P6 is a pressure ring. In this state, the bearing and contact method of each support member is the same as in the first state, and the relevant description in the first state can be referred to.

[0083] In summary, the parameters of the imaging lens in Example 1 under the first state 1-1 and the second state 1-2 are shown in Table 1. (Unit: mm)

[0084]

[0085] Table 1

[0086] In Example 1, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave.

[0087] In Example 1, the semi-FOV (half of the maximum field of view) of the imaging lens is 43.44°, the aperture value of the imaging lens is Fno 1.96, the effective focal length of the imaging lens is f 5.51mm, the effective focal length of the first lens is f1 5.68mm, the effective focal length of the second lens is f2 -23.45mm, the effective focal length of the third lens is f3 30.86mm, the effective focal length of the fourth lens is f4 -14.37mm, the effective focal length of the fifth lens is f5 5.03mm, the effective focal length of the sixth lens is f6 -4.50mm, and the combined focal length of the third and fourth lenses is f34 -27.86mm.

[0088] Table 2 shows the basic structural parameters of the imaging lens in Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0089]

[0090] Table 2

[0091] In Example 1, the object-side and image-side surfaces of the first lens E1 to the sixth lens E6 are all aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0092] Formula (1)

[0093] 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 3 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for the aspherical mirrors s1-s12 in Example 1.

[0094]

[0095] Table 3

[0096] Figure 3 The on-axis chromatic aberration curve of the imaging lens in Example 1 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the imaging lens. Figure 4 The astigmatism curve of the imaging lens in Example 1 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 5 The distortion curve of the imaging lens in Example 1 is shown, which represents the distortion magnitude corresponding to different field of view angles. Figure 6 The magnification chromatic aberration curve of the imaging lens in Example 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the imaging lens.

[0097] according to Figures 3 to 6 As can be seen, the imaging lens given in Example 1 can achieve good image quality.

[0098] Example 2

[0099] like Figures 7 to 12 As shown, the imaging lens of Example 2 is described. Figure 7 A schematic diagram of the imaging lens in Example 2 in its first state is shown. Figure 8 A schematic diagram of the imaging lens in Example 2 in the second state is shown.

[0100] like Figures 7 to 8 As shown, the imaging lens includes a lens barrel P0 and the following components arranged sequentially along the optical axis of the lens barrel P0 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 fourth lens E4, a fourth support P4, a first auxiliary support P4b, a fifth lens E5, a fifth support P5, a sixth lens E6, and a sixth support P6.

[0101] like Figure 7As shown, in the first state of the imaging lens, the first support members P1 to the third support member P3 are all spacers, the fourth support member P4 is a spacer ring, the first auxiliary support member P4b is a spacer, and the sixth support member P6 is a pressure ring. The object-side and image-side of the first support member P1 abut against the image-side S2 of the first lens and the object-side S3 of the second lens, respectively, and the outer periphery of the first support member P1 abuts against the inner wall surface of the lens barrel P0. The object-side and image-side of the second support member P2 abut against the image-side S4 of the second lens and the object-side S5 of the third lens, respectively, and the outer periphery of the second support member P2 abuts against the inner wall surface of the lens barrel P0. The object-side and image-side of the third support member P3 abut against the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively, and the outer periphery of the third support member P3 abuts against the inner wall surface of the lens barrel P0. The object-side and image-side of the fourth support member P4 abut against the image-side S8 of the fourth lens and the object-side of the first auxiliary support member P4b, respectively. The image-side of the first auxiliary support member P4b partially abuts against the object-side S9 of the fifth lens. The outer peripheries of both the fourth support member P4 and the first auxiliary support member P4b abut against the inner wall surface of the lens barrel P0. The object-side and image-side of the fifth support member P5 abut against the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively. The outer periphery of the fifth support member P5 abuts against the inner wall surface of the lens barrel P0. The sixth support member P6 abuts against both the image-side S12 of the sixth lens and the inner wall surface of the lens barrel P0.

[0102] like Figure 8 As shown, in the second state of the imaging lens, the first support member P1 to the third support member P3 are all spacers, the fourth support member P4 is a spacer ring, the first auxiliary support member P4b is a spacer, and the sixth support member P6 is a pressure ring. In this state, the bearing and contact method of each support member is the same as in the first state, and the relevant description in the first state can be referred to.

[0103] In summary, the parameters of the imaging lens in Example 2 under the first state 2-1 and the second state 2-2 are shown in Table 4. (Unit: mm)

[0104]

[0105] Table 4

[0106] In Example 2, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave.

[0107] In Example 2, the semi-FOV (half of the maximum field of view) of the imaging lens is 43.35°, the aperture value of the imaging lens is Fno 1.85, the effective focal length of the imaging lens is f 5.48mm, the effective focal length of the first lens is f1 5.92mm, the effective focal length of the second lens is f2 -40.32mm, the effective focal length of the third lens is f3 33.93mm, the effective focal length of the fourth lens is f4 -16.76mm, the effective focal length of the fifth lens is f5 5.61mm, the effective focal length of the sixth lens is f6 -4.69mm, and the combined focal length of the third and fourth lenses is f34 -34.41mm.

[0108] Table 5 shows the basic structural parameters of the imaging lens in Example 2, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0109]

[0110] Table 5

[0111] Table 6 shows the higher-order coefficients that can be used for each aspherical mirror in Example 2, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0112]

[0113] Table 6

[0114] Figure 9 The on-axis chromatic aberration curve of the imaging lens in Example 2 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the imaging lens. Figure 10 The astigmatism curve of the imaging lens in Example 2 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 11 The distortion curve of the imaging lens in Example 2 is shown, which represents the distortion magnitude corresponding to different field of view angles. Figure 12 The magnification chromatic aberration curve of the imaging lens in Example 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the imaging lens.

[0115] according to Figures 9 to 12 As can be seen, the imaging lens given in Example 2 can achieve good image quality.

[0116] Example 3

[0117] like Figures 13 to 18 As shown, the imaging lens of Example 3 is described. Figure 13 A schematic diagram of the imaging lens in Example 3 in its first state is shown. Figure 14 A schematic diagram of the imaging lens in Example 3 in the second state is shown.

[0118] like Figures 13 to 14As shown, the imaging lens includes a lens barrel P0 and the following components arranged sequentially along the optical axis of the lens barrel P0 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 fourth lens E4, a fourth support P4, a first auxiliary support P4b, a fifth lens E5, a fifth support P5, a sixth lens E6, and a sixth support P6.

[0119] like Figure 13 As shown, in the first state of the imaging lens, the first support members P1 to the third support member P3 are all spacers, the fourth support member P4 is a spacer ring, the first auxiliary support member P4b is a spacer, and the sixth support member P6 is a pressure ring. The object-side and image-side of the first support member P1 abut against the image-side S2 of the first lens and the object-side S3 of the second lens, respectively, and the outer periphery of the first support member P1 abuts against the inner wall surface of the lens barrel P0. The object-side and image-side of the second support member P2 abut against the image-side S4 of the second lens and the object-side S5 of the third lens, respectively, and the outer periphery of the second support member P2 abuts against the inner wall surface of the lens barrel P0. The object-side and image-side of the third support member P3 abut against the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively, and the outer periphery of the third support member P3 abuts against the inner wall surface of the lens barrel P0. The object-side and image-side of the fourth support member P4 abut against the image-side S8 of the fourth lens and the object-side of the first auxiliary support member P4b, respectively. The image-side of the first auxiliary support member P4b partially abuts against the object-side S9 of the fifth lens. The outer peripheries of both the fourth support member P4 and the first auxiliary support member P4b abut against the inner wall surface of the lens barrel P0. The object-side and image-side of the fifth support member P5 abut against the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively. The outer periphery of the fifth support member P5 abuts against the inner wall surface of the lens barrel P0. The sixth support member P6 abuts against both the image-side S12 of the sixth lens and the inner wall surface of the lens barrel P0.

[0120] like Figure 14 As shown, in the second state of the imaging lens, the first support member P1 to the third support member P3 are all spacers, the fourth support member P4 is a spacer ring, the first auxiliary support member P4b is a spacer, and the sixth support member P6 is a pressure ring. In this state, the bearing and contact method of each support member is the same as in the first state, and the relevant description in the first state can be referred to.

[0121] In summary, the parameters of the imaging lens in Example 3 under the first state 3-1 and the second state 3-2 are shown in Table 7. (Unit: mm)

[0122]

[0123] Table 7

[0124] In Example 3, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is concave, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave.

[0125] In Example 3, the semi-FOV (half of the maximum field of view) of the imaging lens is 43.28°, the aperture value of the imaging lens is Fno 1.88, the effective focal length of the imaging lens is f 5.54mm, the effective focal length of the first lens is f1 5.89mm, the effective focal length of the second lens is f2 -35.15mm, the effective focal length of the third lens is f3 33.93mm, the effective focal length of the fourth lens is f4 -17.45mm, the effective focal length of the fifth lens is f5 5.39mm, the effective focal length of the sixth lens is f6 -4.50mm, and the combined focal length of the third and fourth lenses is f34 -37.06mm.

[0126] Table 8 shows the basic structural parameters of the imaging lens in Example 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0127]

[0128] Table 8

[0129] Table 9 shows the higher-order coefficients that can be used for each aspherical mirror in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0130]

[0131] Table 9

[0132] Figure 15 The on-axis chromatic aberration curve of the imaging lens in Example 3 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the imaging lens. Figure 16 The astigmatism curve of the imaging lens in Example 3 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 17 The distortion curve of the imaging lens in Example 3 is shown, which represents the distortion magnitude corresponding to different field of view angles. Figure 18 The magnification chromatic aberration curve of the imaging lens in Example 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the imaging lens.

[0133] according to Figures 15 to 18As can be seen, the imaging lens given in Example 3 can achieve good image quality.

[0134] Example 4

[0135] like Figures 19 to 24 As shown, the imaging lens of Example 4 is described. Figure 19 A schematic diagram of the imaging lens in Example 4 in its first state is shown. Figure 20 A schematic diagram of the imaging lens in Example 4 in the second state is shown.

[0136] like Figures 19 to 20 As shown, the imaging lens includes a lens barrel P0 and the following components arranged sequentially along the optical axis of the lens barrel P0 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 fourth lens E4, a fourth support P4, a first auxiliary support P4b, a fifth lens E5, a fifth support P5, a sixth lens E6, and a sixth support P6.

[0137] like Figure 19 As shown, in the first state of the imaging lens, the first support members P1 to the third support member P3 are all spacers, the fourth support member P4 is a spacer ring, the first auxiliary support member P4b is a spacer, and the sixth support member P6 is a pressure ring. The object-side and image-side of the first support member P1 abut against the image-side S2 of the first lens and the object-side S3 of the second lens, respectively, and the outer periphery of the first support member P1 abuts against the inner wall surface of the lens barrel P0. The object-side and image-side of the second support member P2 abut against the image-side S4 of the second lens and the object-side S5 of the third lens, respectively, and the outer periphery of the second support member P2 abuts against the inner wall surface of the lens barrel P0. The object-side and image-side of the third support member P3 abut against the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively, and the outer periphery of the third support member P3 abuts against the inner wall surface of the lens barrel P0. The object-side and image-side of the fourth support member P4 abut against the image-side S8 of the fourth lens and the object-side of the first auxiliary support member P4b, respectively. The image-side of the first auxiliary support member P4b partially abuts against the object-side S9 of the fifth lens. The outer peripheries of both the fourth support member P4 and the first auxiliary support member P4b abut against the inner wall surface of the lens barrel P0. The object-side and image-side of the fifth support member P5 abut against the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively. The outer periphery of the fifth support member P5 abuts against the inner wall surface of the lens barrel P0. The sixth support member P6 abuts against both the image-side S12 of the sixth lens and the inner wall surface of the lens barrel P0.

[0138] like Figure 20As shown, in the second state of the imaging lens, the first support member P1 to the third support member P3 are all spacers, the fourth support member P4 is a spacer ring, the first auxiliary support member P4b is a spacer, and the sixth support member P6 is a pressure ring. In this state, the support and contact method of each support member is the same as in the first state, and the relevant description in the first state can be referred to. In summary, the parameters of the imaging lens in Example 4 under the first state 4-1 and the second state 4-2 are shown in Table 10. (Unit: mm)

[0139]

[0140] Table 10

[0141] In Example 4, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave.

[0142] In Example 4, the semi-FOV (half of the maximum field of view) of the imaging lens is 43.38°, the aperture value of the imaging lens is Fno 1.87, the effective focal length of the imaging lens is f 5.51mm, the effective focal length of the first lens is f1 6.01mm, the effective focal length of the second lens is f2 -36.16mm, the effective focal length of the third lens is f3 31.44mm, the effective focal length of the fourth lens is f4 -17.06mm, the effective focal length of the fifth lens is f5 5.36mm, the effective focal length of the sixth lens is f6 -4.50mm, and the combined focal length of the third and fourth lenses is f34 -38.95mm.

[0143] Table 11 shows the basic structural parameters of the imaging lens in Example 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0144]

[0145] Table 11

[0146] Table 12 shows the higher-order coefficients that can be used for each aspherical mirror in Example 4, wherein each aspherical surface type can be defined by formula (1) given in Example 1 above.

[0147]

[0148] Table 12

[0149] Figure 21The on-axis chromatic aberration curve of the imaging lens in Example 4 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the imaging lens. Figure 22 The astigmatism curve of the imaging lens in Example 4 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 23 The distortion curve of the imaging lens in Example 4 is shown, which represents the distortion magnitude corresponding to different field of view angles. Figure 24 The magnification chromatic aberration curve of the imaging lens in Example 4 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the imaging lens.

[0150] according to Figures 21 to 24 As can be seen, the imaging lens given in Example 4 can achieve good image quality.

[0151] In summary, Examples 1 to 4 satisfy the relationships shown in Table 13.

[0152]

[0153] Table 13

[0154] It should be noted that in Table 13, 1-1 represents the imaging lens in Example 1 in the first state, 1-2 represents the imaging lens in Example 1 in the second state, 2-1 represents the imaging lens in Example 2 in the first state, 2-2 represents the imaging lens in Example 2 in the second state, 3-1 represents the imaging lens in Example 3 in the first state, 3-2 represents the imaging lens in Example 3 in the second state, 4-1 represents the imaging lens in Example 4 in the first state, and 4-2 represents the imaging lens in Example 4 in the second state.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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, The lens includes a lens barrel and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side to the image side within the lens barrel. The imaging lens contains six lenses with optical power. The fourth lens has at least one inflection point on its image-side surface, and the sixth lens has at least one inflection point on both its object-side and image-side surfaces. The first lens has positive optical power, the second lens has negative optical power, the third lens has positive optical power, the fourth lens has negative optical power, the fifth lens has positive optical power, and the sixth lens has negative optical power. The imaging lens also includes a plurality of support members, the plurality of support members including at least a third support member and a fourth support member, the third support member being located on the image side of the third lens and abutting against a portion of the third lens, and the fourth support member being located on the image side of the fourth lens and abutting against a portion of the fourth lens; The refractive index of the third lens is less than 1.54; The combined focal length f34 of the third lens and the fourth lens, the object-side inner diameter d4s of the fourth support member, the object-side inner diameter d3s of the third support member, and the refractive index N4 of the fourth lens and the refractive index N3 of the third lens satisfy the following: -21.72≤f34 / (d4s-d3s) / (N4 / N3)≤-13.56; The radius of curvature R5 of the object side of the third lens, the radius of curvature R8 of the image side of the fourth lens, and the maximum thickness CP3 of the third support member along the optical axis satisfy the following condition: 0.23mm≤|R5 / R8|*CP3≤3.22mm.

2. The imaging lens according to claim 1, characterized in that, The radius of curvature of the object side of the fourth lens is greater than zero. The radius of curvature R6 of the image side of the third lens, the radius of curvature R7 of the object side of the fourth lens, the inner diameter d4s of the object side of the fourth support member and the inner diameter d3s of the object side of the third support member satisfy the following: -0.35≤(R6+R7) / (d4s+d3s)≤1.

92.

3. The imaging lens according to claim 2, characterized in that, The plurality of the supporting members further includes a sixth supporting member, which is located on the image side of the sixth lens and partially abuts against the sixth lens. The radius of curvature of the object side of the sixth lens is greater than zero. The radius of curvature R11 of the object side of the sixth lens, the radius of curvature R12 of the image side of the sixth lens, the maximum thickness CP6 of the sixth supporting member along the optical axis, and the center thickness CT6 of the sixth lens satisfy the following: 5.55mm≤(R11+R12) / (CP6 / CT6)≤7.83mm.

4. The imaging lens according to claim 1, characterized in that, The effective focal length f3 of the third lens, the center thickness CT3 of the third lens, the radius of curvature R8 of the image side surface of the fourth lens, and the inner diameter d3m of the image side surface of the third support member satisfy the following condition: 68.23≤f3 / CT3+R8 / d3m≤77.

81.

5. The imaging lens according to claim 1, characterized in that, The combined focal length f34 of the third lens and the fourth lens, the effective focal length f of the imaging lens, the object-side outer diameter D3s of the third support member, and the image-side outer diameter D0m of the lens barrel satisfy the following condition: -6.49≤f34 / f+D3s / D0m≤-4.

48.

6. The imaging lens according to claim 1, characterized in that, The distance EP34 between the third support member and the fourth support member along the optical axis, the center thickness CT4 of the fourth lens, and the Abbe number V4 of the fourth lens satisfy the following condition: 24.00≤EP34 / CT4*V4≤27.

23.

7. The imaging lens according to claim 1, characterized in that, The radius of curvature R7 of the object side of the fourth lens, the inner diameter d3m of the image side of the third support member, the radius of curvature R8 of the image side of the fourth lens, and the inner diameter d4m of the image side of the fourth support member satisfy the following condition: 3.89≤R7 / d3m / (R8 / d4m)≤6.

65.

8. The imaging lens according to claim 1, characterized in that, The effective half-aperture DT51 of the object side of the fifth lens, the effective half-aperture DT32 of the image side of the third lens, the outer diameter D4s of the object side of the fourth support member, and the outer diameter D3m of the image side of the third support member satisfy the following condition: 1.43≤(DT51-DT32) / (D4s-D3m)≤1.

68.

9. The imaging lens according to claim 1, characterized in that, The plurality of the support members further includes a second support member, which is located on the image side of the second lens and partially abuts against the second lens. The center thickness CT3 of the third lens, the distance EP23 between the second support member and the third support member along the optical axis, the distance EP34 between the third support member and the fourth support member along the optical axis, and the center thickness CT4 of the fourth lens satisfy the following condition: 1.46≤CT3 / EP23 / (EP34 / CT4)≤1.

67.

10. The imaging lens according to claim 1, characterized in that, The imaging lens further includes a first auxiliary support member, which partially abuts against the fourth support member. The object-side outer diameter D4bs of the first auxiliary support member, the image-side outer diameter D4m of the fourth support member, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy the following: 3.05≤(D4bs-D4m) / T45≤3.

44.

11. The imaging lens according to claim 1, characterized in that, The maximum thickness CP4 of the fourth support member along the optical axis, the maximum thickness CP3 of the third support member along the optical axis, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy the following condition: -3.39≤(CP4 / CP3) / (f3 / f4)≤-2.

68.

12. The imaging lens according to claim 1, characterized in that, The effective focal length f of the imaging lens, half of the maximum field of view (Semi-FOV) of the imaging lens, the maximum height L of the lens barrel, and the aperture number FNO of the imaging lens satisfy the following condition: 1.70≤f*tan(Semi-FOV) / L*FNO≤1.

81.

13. The imaging lens according to any one of claims 1 to 12, characterized in that, The distance Yc41 from the critical point of the object-side curved surface of the fourth lens near the optical axis and the distance Yc42 from the critical point of the image-side curved surface of the fourth lens near the optical axis to the optical axis, and the interval EP34 between the third support member and the fourth support member along the optical axis direction satisfy the following condition: 1.69≤(Yc41+Yc42) / EP34≤2.

31.

14. The imaging lens according to claim 1, characterized in that, The plurality of the supporting members further includes a first supporting member and a fifth supporting member, wherein the first supporting member is located on the image side of the first lens and abuts against a portion of the first lens, and the fifth supporting member is located on the image side of the fifth lens and abuts against a portion of the fifth lens.

Images