Optical imaging lens

Abstract

The invention provides an optical imaging lens. The optical imaging lens comprises a plurality of lenses, a plurality of separators and a lens barrel, the distance TD from the object side surface of the first lens to the image side surface of the seventh lens on the optical axis and the half Semi-FOV of the maximum field angle of the optical imaging lens meet the following conditions:-4mmlt; tD / tan (Semi-FOV) lt; 2 mm; the effective focal length f3 of the third lens and the effective focal length f1 of the first lens meet the following conditions: 1lt; f3 / f1lt; 4; the air gap T34 of the third lens and the fourth lens on the optical axis and the center thickness CP1 of the first separator satisfy: 25lt; t34 / CP1lt, T34 / CP1lt; 40); the outer diameter D1m of the image side surface of the first isolation piece, the inner diameter d1m of the image side surface of the first isolation piece, the curvature radius R2 of the image side surface of the first lens and the curvature radius R6 of the image side surface of the third lens meet the following conditions:-8lt; (D1m-d1m) / (R2-R6) lt; 15). The problem of serious stray light of an optical imaging lens in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging devices, and more particularly, to an optical imaging lens. Background Art

[0002] With the development and progress of science and technology, current consumer electronic products such as mobile phones, VR, AR head-mounted devices, and drones are generally equipped with optical imaging lenses for taking photos and videos, spatial recognition and positioning, etc. With product upgrades and the development of new functions, the imaging requirements for optical imaging lenses are getting higher and higher. There is a need not only for a smaller size to adapt to increasingly miniaturized electronic products, but also for a super wide angle to expand the field of view and improve the user experience. However, in order to meet the requirements of miniaturization and super wide angle, the front lens of the existing seven-piece optical imaging lens has a relatively large aperture. However, when the chief ray passes through the front lens, internal stray light is likely to be generated on the lens surface, and some light rays enter the structural part of the lens, thus forming stray light that affects the imaging quality. Therefore, how to design the shape of the front lens of the optical imaging lens and the inner and outer diameter sizes of the support member to reduce stray light while ensuring miniaturization and super wide angle is an urgent problem to be solved. Summary of the Invention

[0003] The main object of the present invention is to provide an optical imaging lens to solve the problem of serious stray light at the front end of the optical imaging lens in the prior art.

[0004] To achieve the above object, according to one aspect of the present invention, an optical imaging lens is provided, comprising: a plurality of lenses, which sequentially include a first lens to a seventh lens from the object side to the image side of the optical imaging lens; a plurality of spacers, among which the first spacer is located on the object side of the fourth lens and at least partially contacts the object side surface of the fourth lens, the second spacer is located on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the third spacer is located on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; a barrel, in which the plurality of lenses and the plurality of spacers are accommodated; wherein, the distance TD on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens and half of the maximum field of view angle Semi-FOV of the optical imaging lens satisfy: -4 mm < TD / tan(Semi-FOV) < -2 mm; the effective focal length f3 of the third lens and the effective focal length f1 of the first lens satisfy: 1 < f3 / f1 < 4; the air gap T34 on the optical axis between the third lens and the fourth lens and the central thickness CP1 of the first spacer satisfy: 25 < T34 / CP1 < 40; the outer diameter D1m of the image side surface of the first spacer, the inner diameter d1m of the image side surface of the first spacer, the curvature radius R2 of the image side surface of the first lens, and the curvature radius R6 of the image side surface of the third lens satisfy: -8 < (D1m - d1m) / (R2 - R6) < 15.

[0005] According to another aspect of the present invention, an optical imaging lens is provided, including: a plurality of lenses, which sequentially include a first lens to a seventh lens from the object side to the image side of the optical imaging lens; a plurality of spacers, among which the first spacer is located on the object side of the fourth lens and at least partially contacts the object side surface of the fourth lens, the second spacer is located on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the third spacer is located on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; a lens barrel, in which the plurality of lenses and the plurality of spacers are accommodated; wherein, the air gap T34 between the third lens and the fourth lens on the optical axis and the central thickness CP1 of the first spacer satisfy: 25 < T34 / CP1 < 40; the axial distance EP01 from the object side end face of the lens barrel to the object side surface of the first spacer, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -4 < EP01 / (f1 + f2 + f3) < 1. The present application provides a seven-piece optical imaging lens. On the premise of 25 < T34 / CP1 < 40, the lenses of the optical imaging lens have good processability and are characterized by miniaturization. However, when the chief ray of the optical imaging lens passes through the front lens, light will be reflected on the lens surface, and part of the light will enter the structural part of the lens, thus forming stray light that affects the imaging quality. And the present application can control the light refraction direction, ensure the chief ray path, reduce the light incident on the structural part of the lens, and thus reduce the generation of stray light by restricting the effective focal lengths of the first lens, the second lens, and the third lens and the distance between the first spacer and the object side end face of the lens barrel.

[0006] Further, the focal length of the first lens is negative, and the focal length of the third lens is negative.

[0007] Further, the axial distance EP01 from the object side end face of the lens barrel to the object side surface of the first spacer, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -4 < EP01 / (f1 + f2 + f3) < 1.

[0008] Further, the plurality of spacers further includes a first auxiliary spacer, which is located between the image side surface of the first lens and the object side surface of the first spacer. The outer diameter D1bs of the object side surface of the first auxiliary spacer, the effective focal length f2 of the second lens, the outer diameter D1bm of the image side surface of the first auxiliary spacer, and the effective focal length f3 of the third lens satisfy: 0 < D1bs / f2 - D1bm / f3 < 2.

[0009] Further, the material of the fourth lens is glass. Among the plurality of spacers, the second auxiliary spacer is located on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens. The following relationship is satisfied among the outer diameter D2bm of the image side surface of the second auxiliary spacer, the inner diameter d2bs of the object side surface of the second auxiliary spacer, the effective focal length f4 of the fourth lens, and the effective focal length f5 of the fifth lens: 1 < (D2bm - d2bs) / (f4 - f5) < 11.

[0010] Further, among the plurality of spacers, there is a first auxiliary spacer located between the image side surface of the first lens and the object side surface of the first spacer; and / or among the plurality of spacers, there is a second auxiliary spacer located on the image side of the fourth lens and at least partially contacting the image side surface of the fourth lens.

[0011] Further, the following relationship is satisfied between the Abbe number V5 of the fifth lens and the Abbe number V6 of the sixth lens: 2.5 < V5 / V6 < 3; the following relationship is satisfied among the outer diameter D2s of the object side surface of the second spacer, the inner diameter d2m of the image side surface of the second spacer, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens: -55 < (D2s - d2m) / (f5 + f6) < 30.

[0012] Further, the following relationship is satisfied among the axial distance EP23 from the image side surface of the second spacer to the object side surface of the third spacer along the optical axis direction, the curvature radius R11 of the object side surface of the sixth lens, the curvature radius R12 of the image side surface of the sixth lens, and the refractive index N6 of the sixth lens: 1 < EP23 / (R11 - R12) * N6 < 2.

[0013] Further, the following relationship is satisfied among the inner diameter d2s of the object side surface of the second spacer, the curvature radius R11 of the object side surface of the sixth lens, the inner diameter d3s of the object side surface of the third spacer, and the curvature radius R12 of the image side surface of the sixth lens: -6 < d2s / R11 + d3s / R12 < -4.

[0014] Further, the following relationship is satisfied among the outer diameter D3m of the image side surface of the third spacer, the inner diameter d3s of the object side surface of the third spacer, the center thickness CT7 of the seventh lens, and the center thickness CT6 of the sixth lens: 1 < (D3m - d3s) / (CT7 - CT6) < 3.

[0015] Further, among the plurality of spacers, there is also a third auxiliary spacer located between the image side surface of the third spacer and the object side surface of the seventh lens. The following relationship is satisfied among the center thickness CP3b of the third auxiliary spacer, the axial distance T67 from the image side surface of the sixth lens to the object side surface of the seventh lens, the axial distance EP23 from the image side surface of the second spacer to the object side surface of the third spacer along the optical axis direction of the optical imaging lens, and the center thickness CT6 of the sixth lens: 4 < CP3b / T67 - EP23 / CT6 < 11.

[0016] Further, the sum of the central thicknesses ∑CP of all the spacers among the multiple spacers and the effective focal length f of the optical imaging lens satisfy: 0.5 < ∑CP / f < 3.

[0017] Further, the outer diameter D0s of the object-side end face of the lens barrel and the distance TD on the optical axis of the optical imaging lens from the object side face of the first lens to the image side face of the seventh lens satisfy: 0.9 < D0s / TD < 1.2; the inner diameter d0s of the object-side end face of the lens barrel, the inner diameter d0m of the image-side end face of the lens barrel, the distance TD on the optical axis of the optical imaging lens from the object side face of the first lens to the image side face of the seventh lens, and the height L of the lens barrel satisfy: 2 < (d0s - d0m) / (TD - L) < 4.

[0018] Further, the inner wall surface of the lens barrel has an annular protruding structure extending towards the optical axis of the optical imaging lens. The shortest distance from the annular protruding structure to the optical axis is less than the shortest distance from the object-side end face of the lens barrel to the optical axis, and the shortest distance from the annular protruding structure to the optical axis is less than the shortest distance from the image-side end face of the lens barrel to the optical axis.

[0019] Further, the object side face of the annular protruding structure is at least partially in contact with the image side face of the second lens, and the image side face of the annular protruding structure is at least partially in contact with the object side face of the first spacer.

[0020] Further, the object side face of the annular protruding structure is at least partially in contact with the image side face of the fourth lens, and the image side face of the annular protruding structure is at least partially in contact with the object side face of the fifth lens.

[0021] Applying the technical solution of the present invention, the optical imaging lens includes a plurality of lenses, a plurality of spacers, and a lens barrel. The plurality of lenses sequentially include a first lens to a seventh lens from the object side to the image side of the optical imaging lens; among the plurality of spacers, the first spacer is located on the object side of the fourth lens and at least partially contacts the object side surface of the fourth lens, the second spacer is located on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the third spacer is located on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the plurality of lenses and the plurality of spacers are accommodated in the lens barrel; wherein, the distance TD on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens and half of the maximum field of view angle Semi-FOV of the optical imaging lens satisfy: -4 mm < TD / tan(Semi-FOV) < -2 mm; the effective focal length f3 of the third lens and the effective focal length f1 of the first lens satisfy: 1 < f3 / f1 < 4; the air gap T34 on the optical axis between the third lens and the fourth lens and the central thickness CP1 of the first spacer satisfy: 25 < T34 / CP1 < 40; the outer diameter D1m of the image side surface of the first spacer, the inner diameter d1m of the image side surface of the first spacer, the curvature radius R2 of the image side surface of the first lens, and the curvature radius R6 of the image side surface of the third lens satisfy: -8 < (D1m - d1m) / (R2 - R6) < 15.

[0022] This application provides a miniaturized and ultra-wide-angle seven-element optical imaging lens. On the premise of -4 mm < TD / tan(Semi-FOV) < -2 mm, 1 < f3 / f1 < 4, and 25 < T34 / CP1 < 40, the front lens of the optical imaging lens has a relatively large aperture and a good lens shape. However, when the chief ray of the optical imaging lens passes through the front lens, light will be reflected on the lens surface, and some light will enter the structural part of the lens, thereby forming stray light that affects the imaging quality. In this application, by restricting the curvature radii of the first lens and the third lens and the inner and outer diameter dimensions of the first spacer, the deflection angle of light is controlled, and at the same time, the path of the marginal light is restricted, thereby reducing the generation of stray light. At the same time, the first spacer is used to intercept the stray light, further eliminating the stray light and improving the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0024] Figure 1 It shows a partial parameter schematic diagram of the optical imaging lens of an optional embodiment of the present invention;

[0025] Figure 2Shows another partial parameter schematic diagram of the optical imaging lens according to an alternative embodiment of the present invention;

[0026] Figure 3 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present invention;

[0027] Figure 4 and Figure 5 Show the axial chromatic aberration curve and the astigmatism curve of Embodiment 1 of the present invention respectively;

[0028] Figure 6 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 2 of the present invention;

[0029] Figure 7 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 3 of the present invention;

[0030] Figure 8 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 4 of the present invention;

[0031] Figure 9 and Figure 10 Show the axial chromatic aberration curve and the astigmatism curve of Embodiment 4 of the present invention respectively;

[0032] Figure 11 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 5 of the present invention;

[0033] Figure 12 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 6 of the present invention;

[0034] Figure 13 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 7 of the present invention;

[0035] Figure 14 and Figure 15 Show the axial chromatic aberration curve and the astigmatism curve of Embodiment 7 of the present invention respectively;

[0036] Figure 16 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 8 of the present invention;

[0037] Figure 17 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 9 of the present invention;

[0038] Figure 18 Shows the stray light energy diagram of the optical imaging lens according to an alternative embodiment of the present invention when (D1m - d1m) / (R2 - R6) = -1.0379;

[0039] Figure 19Shows the stray light energy diagram of an optical imaging lens in the prior art when (D1m - d1m) / (R2 - R6) = 20;

[0040] Figure 20 Shows the stray light energy diagram of an optical imaging lens in the prior art when (D1m - d1m) / (R2 - R6) = -10.

[0041] Among them, the above-mentioned drawings include the following reference numerals:

[0042] 10. Annular protruding structure; P0. Lens barrel; E1. First lens; S1. Object side of the first lens; S2. Image side of the first lens; E2. Second lens; S3. Object side of the second lens; S4. Image side of the second lens; E3. Third lens; S5. Object side of the third lens; S6. Image side of the third lens; E4. Fourth lens; S7. Object side of the fourth lens; S8. Image side of the fourth lens; E5. Fifth lens; S9. Object side of the fifth lens; S10. Image side of the fifth lens; E6. Sixth lens; S11. Object side of the sixth lens; S12. Image side of the sixth lens; E7. Seventh lens; S13. Object side of the seventh lens; S14. Image side of the seventh lens; P1. First spacer; P1b. First auxiliary spacer; P2. Second spacer; P2b. Second auxiliary spacer; P3. Third spacer; P3b. Third auxiliary spacer. Detailed implementation manners

[0043] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0044] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0045] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are generally in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction of the component itself; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contour of each component itself, but the above orientation terms do not limit the present invention.

[0046] It should be noted that in this specification, the expressions such as the first, the second, the third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0047] In the accompanying drawings, for ease of illustration, the thickness, dimensions, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the accompanying drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not drawn to an exact scale.

[0048] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in the field, and the positive or negative of the R value (R refers to the radius of curvature of the paraxial region, usually the R value on the lens database in optical software) is used to judge the convexity or concavity. For the object side, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; for the image side, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex.

[0049] To solve the problem of severe stray light at the front end of an optical imaging lens in the prior art, the present invention provides an optical imaging lens.

[0050] First Embodiment

[0051] As Figures 1 to 18 shown, the optical imaging lens includes a plurality of lenses, a plurality of spacers, and a lens barrel. The plurality of lenses sequentially include a first lens to a seventh lens from the object side to the image side of the optical imaging lens; among the plurality of spacers, the first spacer is located on the object side of the fourth lens and at least partially contacts the object side surface of the fourth lens, the second spacer is located on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the third spacer is located on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; the plurality of lenses and the plurality of spacers are accommodated in the lens barrel; wherein, the distance TD on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens and half of the maximum field of view angle Semi-FOV of the optical imaging lens satisfy: -4mm < TD / tan(Semi-FOV) < -2mm; the effective focal length f3 of the third lens and the effective focal length f1 of the first lens satisfy: 1 < f3 / f1 < 4; the air gap T34 on the optical axis between the third lens and the fourth lens and the central thickness CP1 of the first spacer satisfy: 25 < T34 / CP1 < 40; the outer diameter D1m of the image side surface of the first spacer, the inner diameter d1m of the image side surface of the first spacer, the radius of curvature R2 of the image side surface of the first lens, and the radius of curvature R6 of the image side surface of the third lens satisfy: -8 < (D1m - d1m) / (R2 - R6) < 15.

[0052] The present application provides a seven - element optical imaging lens with miniaturization and ultra - wide angle. On the premise that - 4mm < TD / tan(Semi - FOV) < - 2mm, 1 < f3 / f1 < 4, and 25 < T34 / CP1 < 40, the front lens of the optical imaging lens has a relatively large aperture and a good lens shape. However, when the chief ray of the optical imaging lens passes through the front lens, light will be reflected on the lens surface, and some light will enter the structural part of the lens, thus forming stray light that affects the imaging quality. In this application, by restricting the curvature radii of the first lens and the third lens and the inner and outer diameter sizes of the first spacer, the deflection angle of light is controlled, and at the same time, the path of marginal rays is restricted, thereby reducing the generation of stray light. Meanwhile, the first spacer is used to intercept the stray light, further eliminating the stray light and improving the imaging quality.

[0053] Table 1 below shows a comparison of the stray light conditions between the optical imaging lenses of several alternative embodiments and the optical imaging lenses in the prior art.

[0054]

[0055] Table 1

[0056] As shown in Table 1, on the premise that TD / tan(Semi - FOV) = - 3.1361, f3 / f1 = 2.3665, and T34 / CP1 = 29.6021, for the optical imaging lens in the prior art as shown in Figure 19 when (D1m - d1m) / (R2 - R6) = 20, the stray light energy is strong. Figure 20 For the optical imaging lens in the prior art as shown in Figure 18 when (D1m - d1m) / (R2 - R6) = - 10, it also has strong stray light energy. In contrast, for the optical imaging lens of the present application as shown in Figure 18 when (D1m - d1m) / (R2 - R6) = - 1.0379, that is, when - 8 < (D1m - d1m) / (R2 - R6) < 15, the stray light energy is significantly reduced. Therefore, the optical imaging lens of the present application has a good stray light elimination effect.

[0057] In addition, the third lens of the present application has a reasonable edge - thickness ratio, which ensures the processing and forming of the third lens and is also conducive to controlling the total length of the optical imaging lens.

[0058] Preferably, - 3.5mm < TD / tan(Semi - FOV) < - 2.5mm.

[0059] Preferably, 1.1 < f3 / f1 < 3.9.

[0060] Preferably, 27 < T34 / CP1 < 38.

[0061] Preferably, -7.95 < (D1m - d1s) / (R2 - R6) < 14.98.

[0062] In this embodiment, the focal length of the first lens is negative, and the focal length of the third lens is negative, which is beneficial to increasing the field of view angle and eliminating stray light.

[0063] In this embodiment, the on-axis distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first spacer, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -4 < EP01 / (f1 + f2 + f3) < 1. By restricting EP01 / (f1 + f2 + f3) within a reasonable range, the effective aperture of the lens can be restricted, the refraction direction of light can be controlled, the main optical path can be guaranteed, and the light incident on the structural part of the lens can be reduced, thereby reducing the generation of stray light. Preferably, -3.5 < EP01 / (f1 + f2 + f3) < 0.5.

[0064] In this embodiment, among the multiple spacers, there is also a first auxiliary spacer, which is located between the image-side surface of the first lens and the object-side surface of the first spacer. The outer diameter D1bs of the object-side surface of the first auxiliary spacer, the effective focal length f2 of the second lens, the outer diameter D1bm of the image-side surface of the first auxiliary spacer, and the effective focal length f3 of the third lens satisfy: 0 < D1bs / f2 - D1bm / f3 < 2. By restricting D1bs / f2 - D1bm / f3 within a reasonable range, it is beneficial to ensure the assembly of the optical imaging lens group through the first auxiliary spacer, and at the same time, it is beneficial to restrict the effective aperture of the lens and the processing and forming of the fourth lens. Preferably, 0.2 < D1bs / f2 - D1bm / f3 < 0.5.

[0065] In this embodiment, the material of the fourth lens is glass. Among the multiple spacers, the second auxiliary spacer is located on the image side of the fourth lens and is at least partially in contact with the image-side surface of the fourth lens. The outer diameter D2bm of the image-side surface of the second auxiliary spacer, the inner diameter d2bs of the object-side surface of the second auxiliary spacer, the effective focal length f4 of the fourth lens, and the effective focal length f5 of the fifth lens satisfy: 1 < (D2bm - d2bs) / (f4 - f5) < 11. Setting the fourth lens as a glass material is beneficial to improving the temperature drift. By restricting (D2bm - d2bs) / (f4 - f5) within a reasonable range, the inner and outer diameters of the second auxiliary spacer are controlled, the main optical path is guaranteed, the stray light generated by the fourth lens is reduced, and at the same time, it is beneficial to the processing and forming of the fourth lens. Preferably, 1.1 < (D2bm - d2bs) / (f4 - f5) < 10.5.

[0066] In this embodiment, among the multiple spacers, a first auxiliary spacer is included, and the first auxiliary spacer is located between the image side of the first lens and the object side of the first spacer; alternatively, among the multiple spacers, a second auxiliary spacer located on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens is included. Of course, both the first auxiliary spacer and the second auxiliary spacer can be included in the multiple spacers. The first auxiliary spacer and the second auxiliary spacer can provide support for the fourth lens. At least one of them can ensure that the optical imaging lens architecture is 4 + 3 or 3 + 4, that is, the assembly form of the first four lenses + the last three lenses or the first three lenses + the last four lenses. The different front and rear lens groups are assembled from the object side and the image side of the lens barrel respectively, and a suitable architecture can be selected according to the sensitivity of the optical imaging lens.

[0067] In this embodiment, the Abbe number V5 of the fifth lens and the Abbe number V6 of the sixth lens satisfy: 2.5 < V5 / V6 < 3; the outer diameter D2s of the object side of the second spacer, the inner diameter d2m of the image side of the second spacer, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: -55 < (D2s - d2m) / (f5 + f6) < 30. By limiting V5 / V6 and (D2s - d2m) / (f5 + f6) within a reasonable range, it is beneficial to eliminate chromatic aberration, control the inner and outer diameter dimensions of the second spacer at the same time, effectively reduce stray light, and ensure the rear-end size of the optical imaging lens. Preferably, 2.65 < V5 / V6 < 2.95; -53 < (D2s - d2m) / (f5 + f6) < 29.

[0068] In this embodiment, the distance EP23 along the optical axis direction from the image side of the second spacer to the object side of the third spacer, the curvature radius R11 of the object side of the sixth lens, the curvature radius R12 of the image side of the sixth lens, and the refractive index N6 of the sixth lens satisfy: 1 < EP23 / (R11 - R12)*N6 < 2. By limiting EP23 / (R11 - R12)*N6 within a reasonable range, it is beneficial to control the edge thickness and effective diameter of the sixth lens, control the deflection angle of the light ray in the sixth lens at the same time, and ensure the transmission path of the chief ray. Preferably, 1.2 < EP23 / (R11 - R12)*N6 < 1.8.

[0069] In this embodiment, the following relationship is satisfied among the inner diameter d2s of the object side surface of the second spacer, the curvature radius R11 of the object side surface of the sixth lens, the inner diameter d3s of the object side surface of the third spacer, and the curvature radius R12 of the image side surface of the sixth lens: -6 < d2s / R11 + d3s / R12 < -4. By restricting d2s / R11 + d3s / R12 within a reasonable range, the path of the chief ray can be ensured, the optical aperture of the sixth lens can be restricted, and the surface shape of the sixth lens can be ensured, which is beneficial to the processing and forming of the sixth lens. Preferably, -5.5 < d2s / R11 + d3s / R12 < -4.5.

[0070] In this embodiment, the following relationship is satisfied among the outer diameter D3m of the image side surface of the third spacer, the inner diameter d3s of the object side surface of the third spacer, the central thickness CT7 of the seventh lens, and the central thickness CT6 of the sixth lens: 1 < (D3m - d3s) / (CT7 - CT6) < 3. By restricting (D3m - d3s) / (CT7 - CT6) within a reasonable range, the path of the chief ray and the assembly stability of the optical imaging lens are ensured, and at the same time, the influence of stray light on imaging is avoided. At the same time, the relationship between the apertures and central thicknesses of the sixth lens and the seventh lens is restricted, which is beneficial to the processing and forming of the sixth lens. Preferably, 1.5 < (D3m - d3s) / (CT7 - CT6) < 2.8.

[0071] In this embodiment, among the multiple spacers, there is also a third auxiliary spacer located between the image side surface of the third spacer and the object side surface of the seventh lens. The following relationship is satisfied among the central thickness CP3b of the third auxiliary spacer, the on-axis distance T67 from the image side surface of the sixth lens to the object side surface of the seventh lens, the distance EP23 along the optical axis direction of the optical imaging lens from the image side surface of the second spacer to the object side surface of the third spacer, and the central thickness CT6 of the sixth lens: 4 < CP3b / T67 - EP23 / CT6 < 11. By restricting CP3b / T67 - EP23 / CT6 within a reasonable range, the edge thickness ratio of the sixth lens is restricted, which is beneficial to the processing and forming of the sixth lens, avoiding the joint line from affecting the appearance and even causing the generation of stray light. At the same time, the thickness of the spacer is restricted within a reasonable range to ensure the processing and forming of the spacer and the assembly of the optical imaging lens. Preferably, 4.3 < CP3b / T67 - EP23 / CT6 < 10.9.

[0072] In this embodiment, the following relationship is satisfied between the sum ∑CP of the central thicknesses of all the spacers among the multiple spacers and the effective focal length f of the optical imaging lens: 0.5 < ∑CP / f < 3. By restricting ∑CP / f within a reasonable range, both the processing, forming, and assembly of the optical imaging lens are ensured, and to a certain extent, the total length of the optical imaging lens is restricted. Preferably, 0.7 < ∑CP / f < 2.8.

[0073] In this embodiment, the following relationships are satisfied between the outer diameter D0s of the object-side end face of the lens barrel, and the distance TD on the optical axis of the object side face of the first lens to the image side face of the seventh lens in the optical imaging lens: 0.9 < D0s / TD < 1.2; the following relationships are satisfied between the inner diameter d0s of the object-side end face of the lens barrel, the inner diameter d0m of the image-side end face of the lens barrel, the distance TD on the optical axis of the object side face of the first lens to the image side face of the seventh lens, and the height L of the lens barrel: 2 < (d0s - d0m) / (TD - L) < 4. By limiting D0s / TD and (d0s - d0m) / (TD - L) within a reasonable range, the total length and aperture of the entire optical imaging lens are restricted, and at the same time, the shape of the optical imaging lens is controlled, which is beneficial to module assembly. Preferably, 0.95 < D0s / TD < 1.15; 2.4 < (d0s - d0m) / (TD - L) < 3.9.

[0074] In this embodiment, the inner wall surface of the lens barrel has an annular protruding structure 10 extending towards the optical axis of the optical imaging lens. The shortest distance from the annular protruding structure 10 to the optical axis is less than the shortest distance from the object-side end face of the lens barrel to the optical axis, and the shortest distance from the annular protruding structure 10 to the optical axis is less than the shortest distance from the image-side end face of the lens barrel to the optical axis. Since the annular protruding structure 10 is closer to the optical axis than the object-side end face and the image-side end face of the lens barrel, during the assembly process of the optical imaging lens of the present application, it is divided into two lens groups, front and back, and the two lens groups are assembled from the object side and the image side respectively. At the same time, the effective diameters of the first lens to the fourth lens gradually decrease, and the effective diameters of the fourth lens to the seventh lens gradually increase. Considering the processing and forming limitations of the fourth lens, especially when the fourth lens is made of glass material and the limitation on the outer diameter of the fourth lens, the fourth lens is the first lens to be assembled, and the annular protruding structure 10 can provide a support for the fourth lens.

[0075] Optionally, at least part of the object side face of the annular protruding structure 10 is in contact with the image side face of the second lens, and at least part of the image side face of the annular protruding structure 10 is in contact with the object side face of the first spacer. Such a setting can assemble the fourth lens from the image side of the annular protruding structure 10 and support it on the annular protruding structure 10 through the first spacer to ensure the assembly stability.

[0076] Optionally, at least part of the object side face of the annular protruding structure 10 is in contact with the image side face of the fourth lens, and at least part of the image side face of the annular protruding structure 10 is in contact with the object side face of the fifth lens. Such a setting can assemble the fourth lens from the object side of the annular protruding structure 10 and assemble the fifth lens from the image side of the annular protruding structure 10.

[0077] Second Embodiment

[0078] As Figures 1 to 18As shown in the figure, the optical imaging lens includes a plurality of lenses, a plurality of spacers, and a lens barrel. The plurality of lenses sequentially include a first lens to a seventh lens from the object side to the image side of the optical imaging lens. Among the plurality of spacers, the first spacer is located on the object side of the fourth lens and at least partially contacts the object side surface of the fourth lens. The second spacer is located on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens. The third spacer is located on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens. The plurality of lenses and the plurality of spacers are accommodated in the lens barrel. Among them, the air gap T34 between the third lens and the fourth lens on the optical axis and the central thickness CP1 of the first spacer satisfy: 25 < T34 / CP1 < 40; the axial distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -4 < EP01 / (f1 + f2 + f3) < 1.

[0079] This application provides a seven-piece optical imaging lens. On the premise of 25 < T34 / CP1 < 40, the front lens of the optical imaging lens has good lens processability and miniaturization characteristics. However, when the chief ray of the optical imaging lens passes through the front lens, the lens surface will reflect light, and part of the light will be incident on the structural part of the lens, thus forming stray light and affecting the imaging quality. And this application can control the refraction direction of light, ensure the path of the chief ray, reduce the light incident on the structural part of the lens, and thus reduce the generation of stray light by restricting the effective focal lengths of the first lens, the second lens, and the third lens and the distance between the first spacer and the object side end surface of the lens barrel.

[0080] This application can also ensure the processing and forming of the third lens by restricting the range of T34 / CP1 to make the third lens have a reasonable edge thickness ratio.

[0081] Preferably, -3.5mm < TD / tan(Semi-FOV) < -2.5mm.

[0082] Preferably, 1.1 < f3 / f1 < 3.9.

[0083] Preferably, 27 < T34 / CP1 < 38.

[0084] Preferably, -3.5 < EP01 / (f1 + f2 + f3) < 0.5.

[0085] This embodiment may also include other conditional expressions in the first embodiment, which will not be elaborated here one by one.

[0086] Optionally, the above optical 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 optical imaging lens in the present application may employ multiple lenses, such as the seven lenses described above. By reasonably allocating the effective focal lengths, surface shapes, central thicknesses of the respective lenses, and the on-axis distances between the respective lenses, etc., the aperture of the optical imaging lens can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, making the optical imaging lens more conducive to production and applicable to portable electronic devices such as smartphones.

[0087] However, those skilled in the art should understand that without departing from the technical solutions claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although the example of seven lenses is described in the embodiments, the optical imaging lens is not limited to including seven lenses. If needed, the optical imaging lens may further include other numbers of lenses.

[0088] Figure 1 The structural schematic diagram of an optical imaging lens of the present application is shown. Figure 1 Parameters such as d0s, d3s, D1m, etc. are also marked therein to clearly and intuitively understand the meaning of the parameters. For the convenience of showing the structure of the optical imaging lens and the specific surface shape, these parameters will no longer be shown in the drawings when specific embodiments are described subsequently.

[0089] Among them, Dis refers to the outer diameter of the object side surface of the i-th spacer, dis refers to the inner diameter of the object side surface of the i-th spacer, Dim refers to the outer diameter of the image side surface of the i-th spacer, dim refers to the inner diameter of the image side surface of the i-th spacer, CPi refers to the maximum thickness of the i-th spacer, that is, the maximum distance from the object side surface to the image side surface of the i-th spacer along the optical axis direction, and EPij refers to the distance along the optical axis direction between the image side surface of the i-th spacer and the object side surface of the j-th spacer, where i and j are positive integers both greater than or equal to 1. And 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 from the object side end face of the lens barrel P0 to the image side end face of the lens barrel P0 along the optical axis direction.

[0090] The following further describes with reference to the drawings examples of the specific surface shapes and parameters of the optical imaging lens applicable to the above embodiments.

[0091] It should be noted that any one of the following Embodiment 1 to Embodiment 9 is applicable to all embodiments of the present application.

[0092] Embodiment 1

[0093] As Figures 3 to 5As shown, an optical imaging lens according to Embodiment 1 of the present application is described.

[0094] As Figure 3 shown, the optical imaging lens sequentially includes a first lens E1, a second lens E2, a third lens E3, a first spacer P1, a fourth lens E4, a fifth lens E5, a second spacer P2, a sixth lens E6, a third spacer P3, a third auxiliary spacer P3b, and a seventh lens E7 from the object side to the image side. Among them, the second lens and the third lens are cemented to form a cemented lens. The third lens does not abut against the lens barrel. The object side surface of the first auxiliary spacer P1b abuts against the image side surface of the second lens, and the image side surface of the first auxiliary spacer P1b abuts against the object side surface of the first spacer to improve the assembly stability at a large step difference while ensuring the interception effect on stray light.

[0095] As Figure 3 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, the image side surface of the fourth lens is S8, the object side surface of the fifth lens is S9, the image side surface of the fifth lens is S10, the object side surface of the sixth lens is S11, the image side surface of the sixth lens is S12, the object side surface of the seventh lens is S13, and the image side surface of the seventh lens is S14. Since the second lens and the third lens are cemented to form a cemented lens, the image side surface S4 of the second lens and the object side surface S5 of the third lens are the same surface, but the surface shapes of the image side surface of the second lens and the object side surface of the third lens are opposite.

[0096] Table 2 shows the basic structural parameter table of the optical imaging lens of Embodiment 1, where the units of the radius of curvature, thickness / distance, effective focal length, and effective radius are all millimeters (mm).

[0097]

[0098]

[0099] Table 2

[0100] In Table 2, the object side surface S15 of the filter, the image side surface S16 of the filter, and the imaging surface S17 are also given.

[0101] In this embodiment, the first lens and the fourth lens are spherical lenses, and the object side surfaces and image side surfaces of the remaining lenses are all aspherical. The surface shapes of the respective aspherical lenses can be defined by, but are not limited to, the following aspherical formula:

[0102]

[0103] Wherein, x is the sagitta, which is the distance from the vertex of the aspheric surface to the position along the optical axis at a height of h; c is the paraxial curvature of the aspheric 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 correction coefficient of the i-th order of the aspheric surface. Table 3 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 for each aspheric mirror surface in this embodiment.

[0104]

[0105]

[0106] Table 3

[0107] Figure 4 shows the axial chromatic aberration curve of the optical imaging lens in the first embodiment, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the optical imaging lens. Figure 5 shows the astigmatism curve of the optical imaging lens in the first embodiment, which represents the meridional image plane curvature and the sagittal image plane curvature.

[0108] According to Figures 4 to 5 it can be seen that the optical imaging lens given in the first embodiment can achieve good imaging quality.

[0109] The second embodiment

[0110] The difference from the first embodiment is that the parameters of the lens barrel P0 and the spacer are different.

[0111] As Figure 6 shown, the optical imaging lens of the second embodiment of the present application is described. For the sake of brevity, some descriptions similar to those in the first embodiment will be omitted.

[0112] The curvature radii, central thicknesses and other parameters of the first lens to the seventh lens of the optical imaging lens in the second embodiment and the distances between the lenses are the same as those shown in Table 2 and Table 3, but at least some of the parameters such as the thickness of the lens barrel P0, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer and the distance between the spacers are different. Therefore, the imaging quality of the optical imaging lens of this embodiment is as Figures 4 to 5 shown.

[0113] As Figure 6 shown, the second lens and the third lens are glued together to form a glued lens. The second lens does not abut against the lens barrel, and the outer ring surface of the third lens abuts against the lens barrel. The object side surface of the first auxiliary spacer P1b abuts against the image side surface of the first lens, and the image side surface of the first auxiliary spacer P1b abuts against the object side surface of the third lens, improving the assembly stability at large step differences and ensuring the interception effect on stray light.

[0114] Example 3

[0115] The difference from Example 1 is that the parameters of the lens barrel P0 and the spacer are different.

[0116] As Figure 7 shown, the optical imaging lens of Example 3 of the present application is described. For the sake of brevity, some descriptions similar to those in Example 1 will be omitted.

[0117] The curvature radii, central thicknesses and other parameters of the first lens to the seventh lens of the optical imaging lens in Example 3 and the distances between the lenses are the same as those in Example 1, as shown in Table 2 and Table 3. However, at least some of the parameters such as the thickness of the lens barrel P0, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer and the distance between the spacers are different. Therefore, the imaging quality of the optical imaging lens of this embodiment is as Figures 4 to 5 shown.

[0118] As Figure 7 shown, the second lens and the third lens are cemented to form a cemented lens. The third lens does not abut against the lens barrel, and there is no first auxiliary spacer P1b. In addition, a second auxiliary spacer P2b is provided between the fourth lens and the fifth lens. The object side of the second auxiliary spacer abuts against the image side of the fourth lens, and the image side of the second auxiliary spacer P2b abuts against the object side of the fifth lens, improving the assembly stability at the large step difference and ensuring the interception effect on stray light.

[0119] Example 4

[0120] As Figures 8 to 10 shown, the optical imaging lens of Example 4 of the present application is described. For the sake of brevity, some descriptions similar to those in Example 1 will be omitted.

[0121] As Figure 8 shown, the optical imaging lens sequentially includes a first lens E1, a second lens E2, a third lens E3, a first spacer P1, a fourth lens E4, a fifth lens E5, a second spacer P2, a sixth lens E6, a third spacer P3, a third auxiliary spacer P3b, and a seventh lens E7 from the object side to the image side. Among them, the second lens and the third lens are cemented to form a cemented lens. The third lens does not abut against the lens barrel. The object side of the first auxiliary spacer P1b abuts against the image side of the second lens, and the image side of the first auxiliary spacer P1b abuts against the object side of the first spacer, so as to improve the assembly stability at the large step difference and ensure the interception effect on stray light.

[0122] As Figure 8As shown, the object side of the first lens is S1, the image side of the first lens is S2, the object side of the second lens is S3, the image side of the second lens is S4, the object side of the third lens is S5, the image side of the third lens is S6, the object side of the fourth lens is S7, the image side of the fourth lens is S8, the object side of the fifth lens is S9, the image side of the fifth lens is S10, the object side of the sixth lens is S11, the image side of the sixth lens is S12, the object side of the seventh lens is S13, and the image side of the seventh lens is S14. Since the second lens and the third lens are cemented to form a cemented lens, the image side S4 of the second lens and the object side S5 of the third lens are the same surface, but the surface profiles of the image side of the second lens and the object side of the third lens are opposite.

[0123] Table 4 shows the basic structural parameter table of the optical imaging lens of Embodiment 4, where the units of the radius of curvature, thickness / distance, effective focal length, and effective radius are all millimeters (mm).

[0124]

[0125]

[0126] Table 4

[0127] In Table 4, the object side S15 of the filter, the image side S16 of the filter, and the imaging surface S17 are also given.

[0128] Table 5 gives the higher-order term coefficients of the aspherical mirror surfaces that can be used in this embodiment. The surface profiles of the aspherical lenses can be defined by, but are not limited to, formula (1) in Embodiment 1.

[0129] Face number A4 A6 A8 A10 A12 A14 A16 S3 -6.6074E-02 5.1707E-01 -1.8319E+00 4.2912E+00 -6.9751E+00 8.0889E+00 -6.8046E+00 S4 / S5 1.5272E+00 -1.8751E+01 1.4623E+02 -7.4710E+02 2.6203E+03 -6.5137E+03 1.1711E+04 S6 1.9094E-01 -1.7866E+00 1.6750E+01 -9.5192E+01 3.3850E+02 -7.3316E+02 8.3600E+02 S9 -1.3013E-02 6.8445E-02 -2.9110E-01 8.0277E-01 -1.4918E+00 1.9338E+00 -1.7893E+00 S10 -4.2272E-03 -6.8481E-01 2.8556E+00 -6.7167E+00 1.0443E+01 -1.1259E+01 8.6306E+00 S11 3.6523E-01 -1.4417E+00 5.2840E+00 -1.2607E+01 2.0406E+01 -2.3306E+01 1.9239E+01 S12 1.8768E-01 -7.3103E-01 2.3643E+00 -4.6660E+00 6.1859E+00 -5.8040E+00 3.9540E+00 S13 -9.0497E-02 -1.0472E-01 4.2890E-01 -6.8456E-01 6.7756E-01 -4.5865E-01 2.2103E-01 S14 6.2836E-03 -1.0893E-01 2.5338E-01 -3.4680E-01 3.1927E-01 -2.0581E-01 9.4943E-02 Face number A18 A20 A22 A24 A26 A28 A30 S3 4.1833E+00 -1.8765E+00 6.0667E-01 -1.3753E-01 2.0734E-02 -1.8658E-03 7.5816E-05 S4 / S5 -1.5379E+04 1.4748E+04 -1.0210E+04 4.9657E+03 -1.6090E+03 3.1172E+02 -2.7308E+01 S6 -1.4151E+02 -5.8127E+02 -4.0258E+02 2.6877E+03 -3.4624E+03 1.9831E+03 -4.4426E+02 S9 1.1963E+00 -5.7891E-01 2.0067E-01 -4.8532E-02 7.7685E-03 -7.3875E-04 3.1557E-05 S10 -4.7634E+00 1.8964E+00 -5.3897E-01 1.0648E-01 -1.3862E-02 1.0664E-03 -3.6588E-05 S11 -1.1622E+01 5.1468E+00 -1.6537E+00 3.7555E-01 -5.7199E-02 5.2460E-03 -2.1915E-04 S12 -1.9771E+00 7.2527E-01 -1.9285E-01 3.6158E-02 -4.5314E-03 3.4062E-04 -1.1613E-05 S13 -7.7183E-02 1.9598E-02 -3.5834E-03 4.5972E-04 -3.9270E-05 2.0056E-06 -4.6333E-08 S14 -3.1665E-02 7.6353E-03 -1.3162E-03 1.5793E-04 -1.2515E-05 5.8817E-07 -1.2406E-08

[0130] Table 5

[0131] Figure 9 shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 4, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the optical imaging lens. Figure 10 shows the astigmatism curve of the optical imaging lens of Embodiment 4, which represents the meridional image plane curvature and the sagittal image plane curvature.

[0132] According to Figures 9 to 10 it can be seen that the optical imaging lens given in Embodiment 4 can achieve good imaging quality.

[0133] Embodiment 5

[0134] The difference from Embodiment 4 is that the parameters of the lens barrel P0 and the spacer are different.

[0135] As Figure 11As shown, an optical imaging lens according to Embodiment 5 of the present application is described. For the sake of brevity, some descriptions similar to those in Embodiment 4 will be omitted.

[0136] For Embodiment 5, the curvature radii, central thicknesses, and other parameters of the first lens to the seventh lens of the optical imaging lens, as well as the distances between the lenses, are the same as those in Embodiment 4, as shown in Tables 4 and 5. However, at least some of the parameters such as the barrel P0, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the distance between the spacers are different. Therefore, the imaging quality of the optical imaging lens in this embodiment is as Figures 9 to 10 shown.

[0137] As Figure 11 shown, the second lens and the third lens are cemented to form a cemented lens. The third lens does not abut against the barrel and there is no first auxiliary spacer P1b. Additionally, a second auxiliary spacer P2b is provided between the fourth lens and the fifth lens. The object side of the second auxiliary spacer abuts against the image side of the fourth lens, and the image side of the second auxiliary spacer P2b abuts against the object side of the fifth lens, improving the assembly stability at large step differences while ensuring the interception effect on stray light.

[0138] Embodiment 6

[0139] The difference from Embodiment 4 is that the parameters of the barrel P0 and the spacer are different.

[0140] As Figure 12 shown, an optical imaging lens according to Embodiment 6 of the present application is described. For the sake of brevity, some descriptions similar to those in Embodiment 4 will be omitted.

[0141] For Embodiment 6, the curvature radii, central thicknesses, and other parameters of the first lens to the seventh lens of the optical imaging lens, as well as the distances between the lenses, are the same as those in Embodiment 4, as shown in Tables 4 and 5. However, at least some of the parameters such as the barrel P0, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the distance between the spacers are different. Therefore, the imaging quality of the optical imaging lens in this embodiment is as Figures 9 to 10 shown.

[0142] As Figure 12 shown, the second lens and the third lens are cemented to form a cemented lens. The third lens does not abut against the barrel and there is no first auxiliary spacer P1b. Additionally, a second auxiliary spacer P2b is provided between the fourth lens and the fifth lens. The object side of the second auxiliary spacer abuts against the image side of the fourth lens, and the image side of the second auxiliary spacer P2b abuts against the object side of the fifth lens, improving the assembly stability at large step differences while ensuring the interception effect on stray light.

[0143] Embodiment 7

[0144] AsFigures 13 to 15 As shown, an optical imaging lens according to Embodiment 7 of the present application is described. For the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted.

[0145] As Figure 13 shown, the optical imaging lens sequentially includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a first spacer P1, a fourth lens E4, a fifth lens E5, a second spacer P2, a sixth lens E6, a third spacer P3, a third auxiliary spacer P3b, and a seventh lens E7. Among them, the second lens and the third lens are cemented to form a cemented lens. The third lens does not abut against the lens barrel. The object side surface of the first auxiliary spacer P1b abuts against the image side surface of the second lens, and the image side surface of the first auxiliary spacer P1b abuts against the object side surface of the first spacer, so as to improve the assembly stability at the large step difference and at the same time ensure the interception effect on stray light.

[0146] As Figure 13 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, the image side surface of the fourth lens is S8, the object side surface of the fifth lens is S9, the image side surface of the fifth lens is S10, the object side surface of the sixth lens is S11, the image side surface of the sixth lens is S12, the object side surface of the seventh lens is S13, and the image side surface of the seventh lens is S14. Since the second lens and the third lens are cemented to form a cemented lens, the image side surface S4 of the second lens and the object side surface S5 of the third lens are the same surface, but the surface shapes of the image side surface of the second lens and the object side surface of the third lens are opposite.

[0147] Table 6 shows the basic structural parameter table of the optical imaging lens of Embodiment 7, where the units of the radius of curvature, thickness / distance, effective focal length, and effective radius are all millimeters (mm).

[0148]

[0149] Table 6

[0150] In Table 6, the object side surface S15 of the filter, the image side surface S16 of the filter, and the imaging surface S17 are also given.

[0151] Table 7 gives the high-order term coefficients of the aspherical mirror surfaces that can be used in this embodiment. The surface shapes of the aspherical lenses can be defined by, but not limited to, Formula (1) in Embodiment 1.

[0152]

[0153]

[0154] Table 7

[0155] Figure 14 shows the axial chromatic aberration curve of the optical imaging lens of Embodiment VII, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the optical imaging lens. Figure 15 shows the astigmatism curve of the optical imaging lens of Embodiment VII, which represents the meridional image plane curvature and the sagittal image plane curvature.

[0156] According to Figures 14 to 15 it can be seen that the optical imaging lens given in Embodiment VII can achieve good imaging quality.

[0157] Embodiment VIII

[0158] The difference from Embodiment VII is that the parameters of the lens barrel P0 and the spacer are different.

[0159] As Figure 16 shown, the optical imaging lens of Embodiment VIII of the present application is described. For the sake of brevity, some descriptions similar to those of Embodiment VII will be omitted.

[0160] The curvature radii, central thicknesses and other parameters of the first lens to the seventh lens of the optical imaging lens in Embodiment VIII and Embodiment VII, as well as the spacing distances between the lenses, are the same, as shown in Table 6 and Table 7, but at least some of the parameters such as the thickness of the lens barrel P0, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer and the distance between the spacers are different. Therefore, the imaging quality of the optical imaging lens of this embodiment is as Figures 14 to 15 shown.

[0161] As Figure 16 shown, the second lens and the third lens are cemented to form a cemented lens, the third lens does not abut against the lens barrel, and there is no first auxiliary spacer P1b. In addition, a second auxiliary spacer P2b is provided between the fourth lens and the fifth lens. The object side surface of the second auxiliary spacer abuts against the image side surface of the fourth lens, and the image side surface of the second auxiliary spacer P2b abuts against the object side surface of the fifth lens, improving the assembly stability at the large step difference while ensuring the interception effect on stray light.

[0162] Embodiment IX

[0163] The difference from Embodiment VII is that the parameters of the lens barrel P0 and the spacer are different.

[0164] As Figure 17 shown, the optical imaging lens of Embodiment IX of the present application is described. For the sake of brevity, some descriptions similar to those of Embodiment VII will be omitted.

[0165] In Embodiment 9, the curvature radii, central thicknesses, and other parameters of the first lens to the seventh lens of the optical imaging lens are the same as those in Embodiment 7, and the distances between the lenses are also the same, as shown in Table 6 and Table 7. However, at least some of the parameters such as the barrel P0, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the distance between the spacers are different. Therefore, the imaging quality of the optical imaging lens in this embodiment is as Figures 14 to 15 shown.

[0166] As Figure 17 shown, the second lens and the third lens are cemented to form a cemented lens. The third lens does not abut against the barrel, and there is no first auxiliary spacer P1b. In addition, a second auxiliary spacer P2b is provided between the fourth lens and the fifth lens. The object side of the second auxiliary spacer abuts against the image side of the fourth lens, and the image side of the second auxiliary spacer P2b abuts against the object side of the fifth lens, improving the assembly stability at the large step difference while ensuring the interception effect on stray light.

[0167] In summary, Embodiments 1 to 9 respectively satisfy the relationships shown in Table 8.

[0168] Conditional formula / Example 1 2 3 4 5 6 7 8 9 TD / tan(Semi - FOV) -3.1361 -3.1361 -3.1361 -3.3847 -3.3847 -3.3847 -2.7589 -2.7589 -2.7589 f3 / f1 2.3665 2.3665 2.3665 1.2926 1.2926 1.2926 3.8019 3.8019 3.8019 (D1m - d1m) / (R2 - R6) -1.2351 -1.6303 -1.0379 -7.8143 -6.6374 -6.6374 14.9264 11.0026 11.0026 T34 / CP1 29.6021 29.6021 29.6021 31.6883 31.6883 31.6883 36.6381 36.6381 36.6381 EP01 / (f1 + f2 + f3) -0.5188 -0.5176 -0.5176 -3.1175 -3.1175 -3.1175 0.1994 0.1994 0.1994 D1bs / f2 - D1bm / f3 0.8965 1.1957 / 1.2822 / / 0.3174 / / (D2bm - d2bs) / (f4 - f5) / / 10.1361 / 1.7129 1.7793 / 1.1710 / (D2s - d2m) / (f5 + f6) 6.7436 6.7436 6.6903 28.8442 28.8275 28.8275 -50.9677 -42.9032 -42.9032 EP23 / (R11 - R12)*N6 1.5821 1.5784 1.5784 1.5823 1.5823 1.5823 1.3504 1.3504 1.3564 d2s / R11 + d3s / R12 -5.1457 -5.1035 -5.1046 -5.0607 -5.0621 -4.9563 -4.7452 -4.7687 -4.7019 (D3m - d3s) / (CT7 - CT6) 2.2655 2.3893 2.3918 2.2752 2.2740 2.5788 1.9208 1.8698 2.0145 CP3b / T67 - EP23 / CT6 4.5196 4.5383 4.5383 7.6269 7.6192 7.6269 10.7681 10.7756 10.7280 ∑CP / f 1.0522 0.9992 1.5509 1.2796 1.8995 1.8775 1.9982 2.6406 2.6351 D0s / TD 1.0054 1.0054 1.0054 0.9623 0.9623 0.9623 1.1206 1.1206 1.1206 (d0s - d0m) / (TD - L) 2.6903 2.6910 2.6910 2.7385 2.7385 2.7385 3.8092 3.8092 3.8092 V5 / V6 2.8924 2.8924 2.8924 2.8924 2.8924 2.8924 2.9158 2.9158 2.9158

[0169] Table 8

[0170] Table 9 gives some parameters of the optical imaging lenses of Embodiments 1 to 9.

[0171]

[0172]

[0173] Table 9

[0174] Table 10 gives some optical parameters of the first lens to the seventh lens of the optical imaging lenses of Embodiments 1 to 9, where EPD is the entrance pupil diameter of the optical imaging lens.

[0175] Basic data / Example 1 2 3 4 5 6 7 8 9 Semi - FOV 107.50 107.50 107.50 108.04 108.04 108.04 104.00 104.00 104.00 EPD 1.11 1.11 1.11 1.00 1.00 1.00 0.75 0.75 0.75 TD 9.95 9.95 9.95 10.39 10.39 10.39 11.07 11.07 11.07 f 1.60 1.60 1.60 1.46 1.46 1.46 1.10 1.10 1.10 f1 -3.83 -3.83 -3.83 -3.89 -3.89 -3.89 -5.31 -5.31 -5.31 f2 8.88 8.88 8.88 8.21 8.21 8.21 35.77 35.77 35.77 f3 -9.06 -9.06 -9.06 -5.02 -5.02 -5.02 -20.17 -20.17 -20.17 f4 3.51 3.51 3.51 3.79 3.79 3.79 3.96 3.96 3.96 f5 3.41 3.41 3.41 3.22 3.22 3.22 2.96 2.96 2.96 f6 -3.18 -3.18 -3.18 -3.16 -3.16 -3.16 -2.99 -2.99 -2.99 f7 3.71 3.71 3.71 3.37 3.37 3.37 2.88 2.88 2.88

[0176] Table 10

[0177] The present application also provides an imaging device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0178] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0179] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also 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.

[0180] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0181] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that, it includes: a plurality of lenses, which successively include a first lens to a seventh lens from the object side to the image side of the optical imaging lens; a plurality of spacers, among which the first spacer is located on the object side of the fourth lens and at least partially contacts the object side surface of the fourth lens, the second spacer is located on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens, and the third spacer is located on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens; a lens barrel, in which the plurality of lenses and the plurality of spacers are accommodated; wherein, the distance TD on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens and half of the maximum field of view angle Semi - FOV of the optical imaging lens satisfy: -4mm < TD / tan(Semi - FOV) < -2mm; the effective focal length f3 of the third lens and the effective focal length f1 of the first lens satisfy: 1 < f3 / f1 < 4; the air gap T34 on the optical axis between the third lens and the fourth lens and the central thickness CP1 of the first spacer satisfy: 25 < T34 / CP1 < 40; the outer diameter D1m of the image side surface of the first spacer, the inner diameter d1m of the image side surface of the first spacer, the curvature radius R2 of the image side surface of the first lens, and the curvature radius R6 of the image side surface of the third lens satisfy: -8 < (D1m - d1m) / (R2 - R6) < 15.

2. The optical imaging lens according to claim 1, characterized in that, the focal length of the first lens is negative, and the focal length of the third lens is negative.

3. The optical imaging lens according to claim 1, characterized in that, the axial distance EP01 from the object side end face of the lens barrel to the object side surface of the first spacer, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -4 < EP01 / (f1 + f2 + f3) < 1.

4. The optical imaging lens according to claim 1, characterized in that, among the plurality of spacers, there is also a first auxiliary spacer, which is located between the image side surface of the first lens and the object side surface of the first spacer, and the outer diameter D1bs of the object side surface of the first auxiliary spacer, the effective focal length f2 of the second lens, the outer diameter D1bm of the image side surface of the first auxiliary spacer, and the effective focal length f3 of the third lens satisfy: 0 < D1bs / f2 - D1bm / f3 < 2.

5. The optical imaging lens according to claim 1, characterized in that, The material of the fourth lens is glass. Among the multiple spacers, the second auxiliary spacer is located on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens. The following relationship is satisfied among the outer diameter D2bm of the image side surface of the second auxiliary spacer, the inner diameter d2bs of the object side surface of the second auxiliary spacer, the effective focal length f4 of the fourth lens, and the effective focal length f5 of the fifth lens: 1 < (D2bm - d2bs) / (f4 - f5) < 11.

6. The optical imaging lens according to claim 1, wherein, among the multiple spacers, there is a first auxiliary spacer located between the image side surface of the first lens and the object side surface of the first spacer; and / or among the multiple spacers, there is a second auxiliary spacer located on the image side of the fourth lens and at least partially contacting the image side surface of the fourth lens.

7. The optical imaging lens according to claim 1, wherein, the following relationship is satisfied between the Abbe number V5 of the fifth lens and the Abbe number V6 of the sixth lens: 2.5 < V5 / V6 < 3; the following relationship is satisfied among the outer diameter D2s of the object side surface of the second spacer, the inner diameter d2m of the image side surface of the second spacer, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens: -55 < (D2s - d2m) / (f5 + f6) < 30.

8. The optical imaging lens according to claim 1, wherein, the following relationship is satisfied among the distance EP23 along the optical axis direction from the image side surface of the second spacer to the object side surface of the third spacer, the curvature radius R11 of the object side surface of the sixth lens, the curvature radius R12 of the image side surface of the sixth lens, and the refractive index N6 of the sixth lens: 1 < EP23 / (R11 - R12) * N6 < 2.

9. The optical imaging lens according to claim 1, wherein, the following relationship is satisfied among the inner diameter d2s of the object side surface of the second spacer, the curvature radius R11 of the object side surface of the sixth lens, the inner diameter d3s of the object side surface of the third spacer, and the curvature radius R12 of the image side surface of the sixth lens: -6 < d2s / R11 + d3s / R12 < -4.

10. The optical imaging lens according to claim 1, wherein, the following relationship is satisfied among the outer diameter D3m of the image side surface of the third spacer, the inner diameter d3s of the object side surface of the third spacer, the central thickness CT7 of the seventh lens, and the central thickness CT6 of the sixth lens: 1 < (D3m - d3s) / (CT7 - CT6) < 3.

Images