Optical imaging lens

Abstract

The present invention provides an optical imaging lens. The optical imaging lens includes a first group, a reflective element, a second group, a third group, and a fourth group. The first group includes a first lens; the second group includes a second lens; the third group includes a first lens barrel and a third lens, a fourth lens, and a fifth lens sequentially arranged in the first lens barrel in a direction away from the second group; the fourth group includes a second lens barrel and a sixth lens, a seventh lens, and an eighth lens sequentially arranged in the second lens barrel in a direction away from the third group. The lens satisfies the following conditions: 6.19 ≤ R12 / (D6s-d6s) ≤ 8.80; and 1.34 ≤ R13 / D6m ≤ 5.41. The present invention solves the problem in prior art of eight-element, multi-group optical imaging lenses that, due to system chromatic aberration correction, produces excess stray light on the image-side lens surface.

Description

Technical Field

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

[0002] With the increasing demand for optical imaging lenses used in portable electronic devices, various types of optical imaging lenses are emerging. Eight-element multi-group optical imaging lenses are widely used in various electronic devices due to their high integration and ability to meet users' various shooting needs.

[0003] Stray light, or non-imaging light, refers to light that does not follow the designed path within an optical imaging lens. This light can cause halos and ghosting during image formation, severely reducing image clarity and contrast. In existing eight-element, multi-group optical imaging lenses, to correct for systematic chromatic aberration, the radius of curvature of the image-side lens is often larger, resulting in a flatter center relative to the edges. Light passing through these edges is prone to internally reflected stray light, affecting image quality and, consequently, image clarity and contrast.

[0004] That is, the existing eight-element multi-group optical imaging lens has the problem of correcting system chromatic aberration, which causes excess stray light to be generated on the image-side lens surface. Summary of the Invention

[0005] The main purpose of the present invention is to provide an optical imaging lens to solve the problem of the existing eight-element multi-group optical imaging lens having chromatic aberration correction system, which causes excess stray light to be generated on the image-side lens surface.

[0006] To achieve the above-mentioned object, according to one aspect of the present invention, an optical imaging lens is provided, comprising a first group, a reflective element, a second group, a third group, and a fourth group. The optical imaging lens further comprises a first optical axis and a second optical axis, the first optical axis being perpendicular to the second optical axis. The first group is arranged along the first optical axis, the second group, the third group, and the fourth group are all arranged along the second optical axis, and the second group, the third group, and the fourth group are arranged sequentially in a direction away from the reflective element. The reflective element is configured to receive light passing through the first group and reflect the light toward the second group. The first group comprises a first lens; the second group comprises a second lens; and the third group comprises a first lens barrel and a third lens sequentially arranged in the first lens barrel in a direction away from the second group. , the fourth lens and the fifth lens; the fourth group includes the second lens barrel and the sixth lens, the seventh lens and the eighth lens sequentially arranged in the second lens barrel along the direction away from the third group, and the number of lenses of the optical imaging lens is eight; the fourth group also includes a sixth spacer placed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens; the curvature radius R12 of the image side surface of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacer and the inner diameter d6s of the object side surface of the sixth spacer satisfy: 6.19≤R12 / (D6s-d6s)≤8.80; the curvature radius R13 of the object side surface of the seventh lens and the outer diameter D6m of the image side surface of the sixth spacer satisfy: 1.34≤R13 / D6m≤5.41.

[0007] According to another aspect of the present invention, an optical imaging lens is provided, comprising a first group, a reflective element, a second group, a third group, and a fourth group. The optical imaging lens further comprises a first optical axis and a second optical axis, the first optical axis being perpendicular to the second optical axis, the first group being arranged along the first optical axis, the second group, the third group, and the fourth group being arranged along the second optical axis, and the second group, the third group, and the fourth group being arranged in sequence in a direction away from the reflective element, the reflective element being configured to receive light passing through the first group and reflect the light to the second group; the first group comprising a first lens; the second group comprising a second lens; the third group comprising a first lens barrel and a third lens, a fourth lens, and a fifth lens arranged in sequence in the first lens barrel in a direction away from the second group; the fourth group comprising a second lens barrel and The optical imaging lens comprises eight lenses, namely, a sixth lens, a seventh lens, and an eighth lens, arranged in sequence in the second lens barrel away from the third lens group. The fourth lens group further comprises a sixth spacer disposed between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens, and a seventh spacer disposed between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens. The curvature radius R12 of the image-side surface of the sixth lens, the outer diameter D6s of the object-side surface of the sixth spacer, and the inner diameter d6s of the object-side surface of the sixth spacer satisfy the following relationship: 6.19 ≤ R12 / (D6s - d6s) ≤ 8.80. The spacing distance EP67 from the image-side surface of the sixth spacer to the object-side surface of the seventh spacer on the second optical axis satisfies the following relationship: 10.70 ≤ R13 / EP67 ≤ 45.19.

[0008] Furthermore, the object-side surface of the first lens is a convex surface, and the curvature radius R1 of the object-side surface of the first lens, the refractive index N1 of the first lens, and the center thickness CT1 of the first lens on the first optical axis satisfy: .

[0009] Furthermore, the image side surface of the first lens is concave, the object side surface of the second lens is concave, and the curvature radius R2 of the image side surface of the first lens and the curvature radius R3 of the object side surface of the second lens satisfy: -1.45≤R2 / R3≤-1.01.

[0010] Furthermore, the third group further includes a third spacer disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and a fourth spacer disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens.

[0011] Furthermore, the image-side surface of the second lens is convex, the object-side surface of the third lens is convex, and the curvature radius R4 of the image-side surface of the second lens and the curvature radius R5 of the object-side surface of the third lens satisfy: -3.69≤R4 / R5≤-0.85.

[0012] Furthermore, the third group also includes a third spacer placed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and the center thickness CT2 of the second lens on the second optical axis and the center thickness CT3 of the third lens on the second optical axis satisfy: 1.66≤CT3 / CT2≤2.18; the effective focal length f3 of the third lens, the center thickness CT3 of the third lens on the second optical axis, and the spacing distance EP303 from the object side surface of the first lens barrel to the object side surface of the third spacer on the second optical axis satisfy: 3.03≤f3 / (EP303+CT3)≤4.51.

[0013] Furthermore, the image-side surface of the third lens is convex, the object-side surface of the fourth lens is convex, and the curvature radius R6 of the image-side surface of the third lens and the curvature radius R7 of the object-side surface of the fourth lens satisfy: 1.09≤|R6-R7| / |R6+R7|≤3.37.

[0014] Furthermore, the third group also includes a third spacer placed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and the curvature radius R6 of the image side surface of the third lens, the outer diameter D3s of the object side surface of the third spacer, and the inner diameter d3s of the object side surface of the third spacer satisfy: -12.43≤R6 / (D3s-d3s)≤-2.93.

[0015] Furthermore, the spacing distance EP303 from the object side surface of the first lens barrel to the object side surface of the third spacer on the second optical axis, the spacing distance EP34 from the image side surface of the third spacer to the object side surface of the fourth spacer on the second optical axis, and the air spacing T34 between the third lens and the fourth lens on the second optical axis satisfy the following: 14.51≤(EP303+EP34) / T34≤35.11.

[0016] Furthermore, the third group also includes a fourth spacer placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens. The image side surface of the fourth lens is concave, and the curvature radius R8 of the image side surface of the fourth lens and the center thickness CT4 of the fourth lens on the second optical axis satisfy: 4.08≤R8 / CT4≤7.00; the curvature radius R8 of the image side surface of the fourth lens, the outer diameter D4s of the object side surface of the fourth spacer, and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 1.60≤R8 / (D4s-d4s)≤2.68.

[0017] Furthermore, the fifth lens element has positive power, and the image-side surface of the fifth lens is convex; the sixth lens element has negative power, and the object-side surface of the sixth lens is concave; the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy the following relationship: -1.23≤f6 / f5≤-0.89; and the curvature radius R11 of the object-side surface of the sixth lens and the curvature radius R10 of the image-side surface of the fifth lens satisfy the following relationship: 0.99≤R11 / R10≤1.48.

[0018] Furthermore, a distance EP406 between the object side surface of the second lens barrel and the object side surface of the sixth spacer on the second optical axis and a center thickness CT6 of the sixth lens on the second optical axis satisfy the following relationship: 1.89≤EP406 / CT6≤2.98.

[0019] Furthermore, the fourth group also includes a seventh spacer placed between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens, and the spacing distance EP67 from the image side surface of the sixth spacer to the object side surface of the seventh spacer on the second optical axis, the center thickness CT7 of the seventh lens on the second optical axis and the effective focal length f7 of the seventh lens satisfy the following: 7.18≤f7 / (EP67+CT7)≤10.20.

[0020] Furthermore, the eighth lens has negative power, and the effective focal length f1 of the first lens and the effective focal length f8 of the eighth lens satisfy: -3.22≤f1 / f8≤-1.36.

[0021] Furthermore, the fourth group is movably arranged relative to the third group on the second optical axis.

[0022] Applying the technical solution of the present invention, the optical imaging lens of the present application includes a first group, a reflective element, a second group, a third group, and a fourth group. To correct system chromatic aberration, the curvature radius of the image-side surface of the sixth lens and the curvature radius of the object-side surface of the seventh lens are relatively large, making the center position of these two surfaces flat relative to the edge position. When light passes through the edge areas of the image-side surface of the sixth lens and the object-side surface of the seventh lens, internally reflected stray light is easily generated, thereby affecting image quality. By rationally matching the outer and inner diameters of the sixth spacer to the curvature radius of the image-side surface of the sixth lens and the curvature radius of the object-side surface of the seventh lens, the present application can reduce the generation of internally reflected stray light and improve image clarity and contrast. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0025] Figure 2 A schematic diagram showing the dimensions of an optical imaging lens according to an optional embodiment of the present invention is shown;

[0026] Figure 3 FIG2 shows a schematic structural diagram of the optical imaging lens according to the first embodiment of the present invention when the object distance is infinite;

[0027] Figure 4 FIG2 shows a schematic diagram of the optical structure of the optical imaging lens according to the first embodiment of the present invention when the object distance is infinite;

[0028] Figure 5 shows the axial chromatic aberration curve of the optical imaging lens of Example 1 of the present invention when the object distance is infinite;

[0029] Figure 6 shows the astigmatism curve of the optical imaging lens of Example 1 of the present invention when the object distance is infinite;

[0030] Figure 7 shows the distortion curve of the optical imaging lens according to the first embodiment of the present invention when the object distance is infinite;

[0031] Figure 8 shows a magnification chromatic aberration curve of the optical imaging lens of Example 1 of the present invention when the object distance is infinite;

[0032] Figure 9 FIG2 shows a schematic structural diagram of the optical imaging lens according to the first embodiment of the present invention when the object distance is 300 mm;

[0033] Figure 10 Schematic diagram of the optical structure of the optical imaging lens of the first embodiment of the present invention when the object distance is 300 mm;

[0034] Figure 11 shows the axial chromatic aberration curve of the optical imaging lens of Example 1 of the present invention when the object distance is 300 mm;

[0035] Figure 12 shows the astigmatism curve of the optical imaging lens according to the first embodiment of the present invention when the object distance is 300 mm;

[0036] Figure 13 shows the distortion curve of the optical imaging lens of Example 1 of the present invention when the object distance is 300 mm;

[0037] Figure 14 shows a magnification chromatic aberration curve of the optical imaging lens of Example 1 of the present invention when the object distance is 300 mm;

[0038] Figure 15 FIG2 shows a schematic structural diagram of the optical imaging lens according to the second embodiment of the present invention when the object distance is infinite;

[0039] Figure 16 FIG2 shows a schematic diagram of the optical structure of the optical imaging lens of the second embodiment of the present invention when the object distance is infinite;

[0040] Figure 17 shows an axial chromatic aberration curve of the optical imaging lens of Example 2 of the present invention when the object distance is infinite;

[0041] Figure 18 shows the astigmatism curve of the optical imaging lens of Example 2 of the present invention when the object distance is infinite;

[0042] Figure 19 shows the distortion curve of the optical imaging lens of Example 2 of the present invention when the object distance is infinite;

[0043] Figure 20 shows a magnification chromatic aberration curve of the optical imaging lens of Example 2 of the present invention when the object distance is infinite;

[0044] Figure 21 FIG2 shows a schematic structural diagram of the optical imaging lens of the second embodiment of the present invention when the object distance is 300 mm;

[0045] Figure 22 FIG2 shows a schematic diagram of the optical structure of the optical imaging lens according to the second embodiment of the present invention when the object distance is 300 mm;

[0046] Figure 23 shows the axial chromatic aberration curve of the optical imaging lens of Example 2 of the present invention when the object distance is 300 mm;

[0047] Figure 24 shows the astigmatism curve of the optical imaging lens of Example 2 of the present invention when the object distance is 300 mm;

[0048] Figure 25 shows the distortion curve of the optical imaging lens of Example 2 of the present invention when the object distance is 300 mm;

[0049] Figure 26 shows a magnification chromatic aberration curve of the optical imaging lens of Example 2 of the present invention when the object distance is 300 mm;

[0050] Figure 27 FIG2 shows a schematic structural diagram of the optical imaging lens of the third embodiment of the present invention when the object distance is infinite;

[0051] Figure 28 FIG2 shows a schematic diagram of the optical structure of the optical imaging lens of the third embodiment of the present invention when the object distance is infinite;

[0052] Figure 29 shows the axial chromatic aberration curve of the optical imaging lens of Example 3 of the present invention when the object distance is infinite;

[0053] Figure 30 shows the astigmatism curve of the optical imaging lens of Example 3 of the present invention when the object distance is infinite;

[0054] Figure 31 shows the distortion curve of the optical imaging lens of Example 3 of the present invention when the object distance is infinite;

[0055] Figure 32 shows a magnification chromatic aberration curve of the optical imaging lens of Example 3 of the present invention when the object distance is infinite;

[0056] Figure 33 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 3 of the present invention when the object distance is 300 mm;

[0057] Figure 34 FIG2 shows a schematic diagram of the optical structure of the optical imaging lens of Example 3 of the present invention when the object distance is 300 mm;

[0058] Figure 35 shows the axial chromatic aberration curve of the optical imaging lens of Example 3 of the present invention when the object distance is 300 mm;

[0059] Figure 36 shows the astigmatism curve of the optical imaging lens of Example 3 of the present invention when the object distance is 300 mm;

[0060] Figure 37 shows the distortion curve of the optical imaging lens of Example 3 of the present invention when the object distance is 300 mm;

[0061] Figure 38 shows a magnification chromatic aberration curve of the optical imaging lens of Example 3 of the present invention when the object distance is 300 mm;

[0062] Figure 39 FIG2 shows a schematic structural diagram of the optical imaging lens according to the fourth embodiment of the present invention when the object distance is infinite;

[0063] Figure 40 FIG2 shows a schematic diagram of the optical structure of the optical imaging lens according to the fourth embodiment of the present invention when the object distance is infinite;

[0064] Figure 41 shows an axial chromatic aberration curve of the optical imaging lens of Example 4 of the present invention when the object distance is infinite;

[0065] Figure 42shows the astigmatism curve of the optical imaging lens of Example 4 of the present invention when the object distance is infinite;

[0066] Figure 43 shows the distortion curve of the optical imaging lens of Example 4 of the present invention when the object distance is infinite;

[0067] Figure 44 shows a magnification chromatic aberration curve of the optical imaging lens of Example 4 of the present invention when the object distance is infinite;

[0068] Figure 45 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 4 of the present invention when the object distance is 300 mm;

[0069] Figure 46 FIG2 shows a schematic diagram of the optical structure of the optical imaging lens according to the fourth embodiment of the present invention when the object distance is 300 mm;

[0070] Figure 47 shows the axial chromatic aberration curve of the optical imaging lens of Example 4 of the present invention when the object distance is 300 mm;

[0071] Figure 48 shows the astigmatism curve of the optical imaging lens of Example 4 of the present invention when the object distance is 300 mm;

[0072] Figure 49 shows the distortion curve of the optical imaging lens of Example 4 of the present invention when the object distance is 300 mm;

[0073] Figure 50 shows a magnification chromatic aberration curve of the optical imaging lens of Example 4 of the present invention when the object distance is 300 mm;

[0074] Figure 51 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 5 of the present invention when the object distance is infinite;

[0075] Figure 52 FIG2 shows a schematic diagram of the optical structure of the optical imaging lens of Example 5 of the present invention when the object distance is infinite;

[0076] Figure 53 shows an axial chromatic aberration curve of the optical imaging lens of Example 5 of the present invention when the object distance is infinite;

[0077] Figure 54 shows the astigmatism curve of the optical imaging lens of Example 5 of the present invention when the object distance is infinite;

[0078] Figure 55 shows the distortion curve of the optical imaging lens of Example 5 of the present invention when the object distance is infinite;

[0079] Figure 56 shows a magnification chromatic aberration curve of the optical imaging lens of Example 5 of the present invention when the object distance is infinite;

[0080] Figure 57 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 5 of the present invention when the object distance is 300 mm;

[0081] Figure 58 FIG2 shows a schematic diagram of the optical structure of the optical imaging lens of Example 5 of the present invention when the object distance is 300 mm;

[0082] Figure 59 shows the axial chromatic aberration curve of the optical imaging lens of Example 5 of the present invention when the object distance is 300 mm;

[0083] Figure 60 shows the astigmatism curve of the optical imaging lens of Example 5 of the present invention when the object distance is 300 mm;

[0084] Figure 61 shows the distortion curve of the optical imaging lens of Example 5 of the present invention when the object distance is 300 mm;

[0085] Figure 62 shows a magnification chromatic aberration curve of the optical imaging lens of Example 5 of the present invention when the object distance is 300 mm;

[0086] Figure 63 FIG2 shows a schematic structural diagram of the optical imaging lens according to the sixth embodiment of the present invention when the object distance is infinite;

[0087] Figure 64 FIG2 shows a schematic diagram of the optical structure of the optical imaging lens of Example 6 of the present invention when the object distance is infinite;

[0088] Figure 65 shows an axial chromatic aberration curve of the optical imaging lens of Example 6 of the present invention when the object distance is infinite;

[0089] Figure 66 shows the astigmatism curve of the optical imaging lens of Example 6 of the present invention when the object distance is infinite;

[0090] Figure 67 shows the distortion curve of the optical imaging lens of Example 6 of the present invention when the object distance is infinite;

[0091] Figure 68 shows a magnification chromatic aberration curve of the optical imaging lens of Example 6 of the present invention when the object distance is infinite;

[0092] Figure 69FIG2 shows a schematic structural diagram of the optical imaging lens of Example 6 of the present invention when the object distance is 300 mm;

[0093] Figure 70 FIG2 shows a schematic diagram of the optical structure of the optical imaging lens of Example 6 of the present invention when the object distance is 300 mm;

[0094] Figure 71 shows the axial chromatic aberration curve of the optical imaging lens of Example 6 of the present invention when the object distance is 300 mm;

[0095] Figure 72 shows the astigmatism curve of the optical imaging lens of Example 6 of the present invention when the object distance is 300 mm;

[0096] Figure 73 shows the distortion curve of the optical imaging lens of Example 6 of the present invention when the object distance is 300 mm;

[0097] Figure 74 shows a magnification chromatic aberration curve of the optical imaging lens of Example 6 of the present invention when the object distance is 300 mm;

[0098] Figure 75 The optical path diagram of the optical imaging lens of Example 1 of the present invention is shown when R12 / (D6s-d6s)=8.01 and R13 / D6m=4.66 are satisfied;

[0099] Figure 76 A stray light energy diagram is shown when the optical imaging lens of Example 1 of the present invention satisfies R12 / (D6s-d6s)=8.01 and R13 / D6m=4.66;

[0100] Figure 77 The optical path diagram of the optical imaging lens of Comparative Example 1 is shown when R12 / (D6s-d6s)=8.01 and R13 / D6m=0.56;

[0101] Figure 78 A stray light energy diagram is shown when the optical imaging lens of Comparative Example 1 satisfies R12 / (D6s-d6s)=8.01 and R13 / D6m=0.56;

[0102] Figure 79 The optical path diagram of the optical imaging lens of Comparative Example 2 is shown when R12 / (D6s-d6s)=8.01 and R13 / D6m=6.20 is satisfied;

[0103] Figure 80 A stray light energy diagram is shown when the optical imaging lens of Comparative Example 2 satisfies R12 / (D6s-d6s)=8.01 and R13 / D6m=6.20.

[0104] The above drawings include the following reference numerals:

[0105] STO, aperture; 10, first optical axis; 20, second optical axis; M, reflective element; D1, first group; D2, second group; D3, third group; D4, fourth group; E1, first lens; E2, second lens; P30, first lens barrel; E3, third lens; P3, third spacer; E4, fourth lens; P4, fourth spacer; E5, fifth lens; P40, second lens barrel; E6, sixth lens; P6, sixth spacer; E7, seventh lens; P7, seventh spacer; E8, eighth lens; E9, protective glass; S1, object side surface of first lens; S2, image side surface of first lens Surface; S3, object-side surface of the second lens; S4, image-side surface of the second lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; S13, object-side surface of the seventh lens; S14, image-side surface of the seventh lens; S15, object-side surface of the eighth lens; S16, image-side surface of the eighth lens; S17, object-side surface of the protective glass; S18, image-side surface of the protective glass; S19, imaging surface. DETAILED DESCRIPTION

[0106] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0107] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0108] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0109] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0110] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0111] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it indicates that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it indicates that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to the judgment method commonly used by those skilled in the art, using the positive or negative R value (R refers to the radius of curvature of the paraxial region, typically the R value in the lens database in optical software) to determine whether it is convex or concave. For the object side, a positive R value indicates a convex surface, and a negative R value indicates a concave surface. For the image side, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0112] In this application, the object side refers to the side of the lens where the object to be imaged (not shown in the figure) is located. The image side refers to the side of the lens where the image of the object to be imaged (not shown in the figure) is located. Hereinafter, the object side of a lens refers to the surface of the lens close to the object side, and the image side of a lens refers to the surface of the lens close to the image side. The object side of a spacer refers to the surface of the spacer close to the object side, and the image side of a spacer refers to the surface of the spacer close to the image side.

[0113] In order to solve the problem of excessive stray light generated on the image-side lens surface due to chromatic aberration correction in the prior art eight-element multi-group optical imaging lens, the present invention provides an optical imaging lens.

[0114] like Figures 1 to 74As shown, in an optional embodiment of the present application, the optical imaging lens includes a first group, a reflective element, a second group, a third group, and a fourth group. The optical imaging lens also includes a first optical axis and a second optical axis. The first optical axis is perpendicular to the second optical axis. The first group is arranged along the first optical axis, and the second group, the third group, and the fourth group are all arranged along the second optical axis. The second group, the third group, and the fourth group are arranged in sequence in a direction away from the reflective element. The reflective element is used to receive light passing through the first group and reflect the light to the second group. The first group includes a first lens; the second group includes a second lens; the third group includes a first barrel and a third lens, a fourth lens, and the like, which are sequentially arranged in the first barrel in a direction away from the second group. lens and a fifth lens; the fourth group includes a second lens barrel and a sixth lens, a seventh lens, and an eighth lens arranged in sequence in the second lens barrel along a direction away from the third group, and the optical imaging lens comprises eight lenses; the fourth group also includes a sixth spacer placed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens; the curvature radius R12 of the image side surface of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacer, and the inner diameter d6s of the object side surface of the sixth spacer satisfy the following relationship: 6.19≤R12 / (D6s-d6s)≤8.80; the curvature radius R13 of the object side surface of the seventh lens and the outer diameter D6m of the image side surface of the sixth spacer satisfy the following relationship: 1.34≤R13 / D6m≤5.41.

[0115] The optical imaging lens of the present application includes a first group, a reflective element, a second group, a third group and a fourth group. In order to correct the chromatic aberration of the system, the curvature radius of the image side of the sixth lens and the curvature radius of the object side of the seventh lens are large, so that the center position of the two surfaces is flat relative to the edge position. When the light passes through the edge area of ​​the image side of the sixth lens and the object side of the seventh lens, internal reflection stray light is easily generated, thereby affecting the imaging quality. The present application reasonably matches the outer diameter and inner diameter of the sixth spacer to the curvature radius of the image side of the sixth lens and the curvature radius of the object side of the seventh lens, which can reduce the generation of internal reflection stray light and improve the clarity and contrast of the imaging. It should be noted that the above-mentioned reflective element has a reflective surface for changing the propagation direction of light, and its working principle is based on the law of reflection. Optionally, the reflective element can be a plane reflector or a reflective prism, which can be set according to actual conditions.

[0116] refer to Figure 1As shown in , the first lens is arranged along the first optical axis and is located on the light incident side of the reflective element, and the intersection of the first optical axis and the second optical axis is on the reflective element; the second lens to the eighth lens are arranged in sequence along the second optical axis from the side where the reflective element is located to the direction away from the reflective element, and the second lens to the eighth lens are all located on the light exit side of the reflective element. Light transmitted from the side of the first lens away from the reflective element passes through the first lens and is incident on the reflective element. After being reflected by the reflective element, the light is transmitted in the direction of the second lens, and then passes through the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens in sequence, and finally forms an image on the imaging surface.

[0117] It should be noted that the above-mentioned first lens is arranged along the first optical axis, which can be understood as the optical axis of the first lens coincides with the first optical axis; similarly, the second lens to the eighth lens are arranged along the second optical axis, which can be understood as the optical axes of the second lens to the eighth lens coincide with the second optical axis.

[0118] In addition, refer to Table 1 below. Figures 75 to 80 As shown, Figure 75 The optical path diagram of the optical imaging lens of Example 1 of the present invention is shown when R12 / (D6s-d6s)=8.01 and R13 / D6m=4.66 are satisfied; Figure 76 A stray light energy diagram is shown when the optical imaging lens of Example 1 of the present invention satisfies R12 / (D6s-d6s)=8.01 and R13 / D6m=4.66; Figure 77 The optical path diagram of the optical imaging lens of Comparative Example 1 is shown when R12 / (D6s-d6s)=8.01 and R13 / D6m=0.56; Figure 78 A stray light energy diagram is shown when the optical imaging lens of Comparative Example 1 satisfies R12 / (D6s-d6s)=8.01 and R13 / D6m=0.56; Figure 79 The optical path diagram of the optical imaging lens of Comparative Example 2 is shown when R12 / (D6s-d6s)=8.01 and R13 / D6m=6.20 is satisfied; Figure 80 A stray light energy diagram is shown when the optical imaging lens of Comparative Example 2 satisfies R12 / (D6s-d6s)=8.01 and R13 / D6m=6.20.

[0119] Depend on Figures 75 to 80It can be seen that when R12 / (D6s-d6s)=8.01 and R13 / D6m=4.66, stray light is effectively intercepted by the sixth spacer, and the stray light energy is low, resulting in better performance. When R12 / (D6s-d6s)=8.01 and R13 / D6m=0.56, internally reflected stray light between the sixth spacer and the rear seventh lens is more, and the stray light energy is high, resulting in poorer performance. When R12 / (D6s-d6s)=8.01 and R13 / D6m=6.20, internally reflected stray light between the edge of the sixth spacer and the rear seventh lens is more, and the stray light energy is high, resulting in poorer performance. It can be seen that when 6.19≤R12 / (D6s-d6s)≤8.80 is satisfied and R13 / D6m is controlled within the range of 1.34 to 5.41, the sixth spacer can effectively intercept edge stray light, reduce the generation of internal reflection stray light, and the overall performance is better.

[0120] Table 1

[0121]

[0122] In this embodiment, the third group also includes a third spacer positioned between the third and fourth lenses and in contact with the image side surface of the third lens, and a fourth spacer positioned between the fourth and fifth lenses and in contact with the image side surface of the fourth lens. The fourth group also includes a seventh spacer positioned between the seventh and eighth lenses and in contact with the image side surface of the seventh lens. Within the entire optical imaging lens, the third group is responsible for correcting chromatic aberration and subsequent lens elements. It coordinates compatibility with other components to ensure that the overall optical imaging lens meets design requirements. By properly controlling the dimensions of the first lens barrel, the third spacer, and the fourth spacer, stray light can be reduced.

[0123] In this embodiment, the object-side surface of the first lens is a convex surface, and the curvature radius R1 of the object-side surface of the first lens, the refractive index N1 of the first lens, and the center thickness CT1 of the first lens on the first optical axis satisfy: Constraining this conditional expression balances the center thickness of the first lens on the first optical axis and the radius of curvature of the object-side surface of the first lens, ensuring the compatibility of the radius of curvature and center thickness, avoiding performance degradation of the first lens due to process limitations, and ensuring that the first lens meets optical requirements while maintaining reasonable structural strength. At the same time, controlling the value of this conditional expression within a wide range can reduce field curvature and improve imaging quality.

[0124] In this embodiment, the image-side surface of the first lens is concave, and the object-side surface of the second lens is concave. The radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens satisfy the following relationship: -1.45 ≤ R2 / R3 ≤ -1.01. By constraining the ratio of the radius of curvature of the image-side surface of the first lens to the radius of curvature of the object-side surface of the second lens to a relatively small range, the smoothness of the surfaces of the first and second lenses is ensured, facilitating manufacturing and reducing processing difficulty and cost. Furthermore, the smooth surface shape facilitates optical image stabilization and reduces the risk of performance degradation.

[0125] In this embodiment, the image side surface of the second lens is convex, the object side surface of the third lens is convex, and the curvature radius R4 of the image side surface of the second lens and the curvature radius R5 of the object side surface of the third lens satisfy the following relationship: -3.69≤R4 / R5≤-0.85. By controlling the ratio of the curvature radius of the image side surface of the second lens to the curvature radius of the object side surface of the third lens within a relatively small range, excessive deflection of light is avoided, which facilitates the rational allocation of the optical power of the second and third lenses and avoids the situation where a single lens bears too much aberration correction task. At the same time, the third lens has positive optical power and the fourth lens has negative optical power. The combination of one positive and one negative optical power causes the light passing through the third and fourth lenses to alternate between divergence and convergence, which is beneficial for correcting spherical aberration, coma, and astigmatism.

[0126] In this embodiment, the center thickness CT2 of the second lens on the second optical axis and the center thickness CT3 of the third lens on the second optical axis satisfy the following: 1.66≤CT3 / CT2≤2.18; the effective focal length f3 of the third lens, the center thickness CT3 of the third lens on the second optical axis, and the spacing distance EP303 from the object side surface of the first lens barrel to the object side surface of the third spacer on the second optical axis satisfy the following: 3.03≤f3 / (EP303+CT3)≤4.51. The ratio of the center thickness of the third lens on the second optical axis to the center thickness of the second lens on the second optical axis is within a reasonable range, which can ensure that the center thickness of the third lens is sufficient to perform aberration correction, provide a larger optical power adjustment space, help correct field curvature or astigmatism, and avoid the situation where the third lens is too thick, resulting in an optical imaging lens that is too large in size. By controlling the effective focal length of the third lens, the center thickness of the third lens on the second optical axis, and the distance between the object side surface of the first lens barrel and the object side surface of the third spacer on the second optical axis, it is helpful to ensure the rationality of the center thickness and edge thickness of the third lens, ensure the processing feasibility of the third lens, and at the same time, help to ensure the stability of the contact between the third lens and the first lens barrel.

[0127] In this embodiment, the image-side surface of the third lens is convex, and the object-side surface of the fourth lens is convex. The radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy the following relationship: 1.09 ≤ |R6-R7| / |R6+R7| ≤ 3.37. By controlling the difference in the radius of curvature of two adjacent surfaces, the aberrations and structural design of the optical imaging lens are optimized. The shape of the image-side surface of the third lens and the object-side surface of the fourth lens, which resembles a glued surface, helps balance aberrations and avoids the risk of higher-order aberrations caused by excessive surface curvature.

[0128] In this embodiment, the radius of curvature R6 of the image-side surface of the third lens, the outer diameter D3s of the object-side surface of the third spacer, and the inner diameter d3s of the object-side surface of the third spacer satisfy the following relationship: -12.43 ≤ R6 / (D3s - d3s) ≤ -2.93. By controlling this conditional expression, the outer and inner diameters of the object-side surface of the third spacer are constrained, allowing the third spacer to interact with the edge of the third lens to intercept stray light. Furthermore, by limiting the radius of curvature of the image-side surface of the third lens, the refraction angle of light passing through the third lens is maintained within a reasonable range, ensuring smooth light transmission.

[0129] In this embodiment, the distance EP303 between the object side surface of the first lens barrel and the object side surface of the third spacer on the second optical axis, the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer on the second optical axis, and the air gap T34 between the third lens and the fourth lens on the second optical axis satisfy the following relationship: 14.51≤(EP303+EP34) / T34≤35.11. By controlling this relationship, the center thickness of the third lens on the second optical axis and the thickness of the structure on the object side end of the first lens barrel can be indirectly controlled, ensuring the rationality of the thickness and indirectly reducing the processing costs of the third lens, the first lens, the third spacer, and the fourth spacer.

[0130] In this embodiment, the image-side surface of the fourth lens is concave. The relationship between the radius of curvature R8 of the image-side surface of the fourth lens and the center thickness CT4 of the fourth lens on the second optical axis satisfies the following: 4.08 ≤ R8 / CT4 ≤ 7.00. The relationship between the radius of curvature R8 of the image-side surface of the fourth lens, the outer diameter D4s of the object-side surface of the fourth spacer, and the inner diameter d4s of the object-side surface of the fourth spacer satisfies the following: 1.60 ≤ R8 / (D4s - d4s) ≤ 2.68. Limiting the ratio of R8 to CT4 avoids extreme designs, such as extremely thin or thick lenses, and helps reduce the manufacturing difficulty and cost of the fourth lens, ensuring the compatibility between the radius of curvature of the fourth lens and the center thickness, thereby avoiding performance degradation due to process limitations. Furthermore, by constraining the outer and inner diameters of the object-side surface of the fourth spacer, the fourth spacer can intercept stray light generated by the edge of the fourth lens, thereby reducing the possibility of stray light generation.

[0131] In this embodiment, the fifth lens element has positive focal power and a convex image-side surface; the sixth lens element has negative focal power and a concave object-side surface; the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy the following relationship: -1.23 ≤ f6 / f5 ≤ -0.89; and the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R10 of the image-side surface of the fifth lens satisfy the following relationship: 0.99 ≤ R11 / R10 ≤ 1.48. Controlling the ratio of f6 / f5 to within a relatively small range facilitates the proper distribution of the focal power of the sixth and fifth lenses, avoids significant light deflection when passing through the fifth and sixth lenses, and improves the stability of the optical imaging lens. Controlling the ratio of the radius of curvature of the object-side surface of the sixth lens to the radius of curvature of the image-side surface of the fifth lens facilitates the control of excessive surface variations between the two surfaces, thereby improving the processability of the lens and reducing manufacturing costs.

[0132] In this embodiment, the distance EP406 between the object side surface of the second lens barrel and the object side surface of the sixth spacer on the second optical axis and the center thickness CT6 of the sixth lens on the second optical axis satisfy the following relationship: 1.89 ≤ EP406 / CT6 ≤ 2.98. As the first lens in the fourth lens group, the sixth lens maintains a suitable thickness at the object side of the second lens barrel and a suitable edge thickness of the sixth lens by controlling the above relationship. Excessive or insufficient thicknesses can affect processing.

[0133] In this embodiment, the distance EP67 between the image-side surface of the sixth spacer and the object-side surface of the seventh spacer on the second optical axis, the center thickness CT7 of the seventh lens on the second optical axis, and the effective focal length f7 of the seventh lens satisfy the following equation: 7.18≤f7 / (EP67+CT7)≤10.20. This constraint helps ensure the positive focal power of the seventh lens and its light-contracting effect, thereby reducing the diameter of the eighth lens and, when the eighth lens is a trimmed lens, reducing the trimming ratio and molding difficulty. Controlling this conditional expression also facilitates a smooth transition at the edge of the seventh lens, facilitating injection molding and, consequently, improving production yield.

[0134] In this embodiment, the eighth lens has negative power, and the effective focal length f1 of the first lens and the effective focal length f8 of the eighth lens satisfy the following relationship: -3.22 ≤ f1 / f8 ≤ -1.36. The negative power of the eighth lens helps diverge light, resulting in a larger field of view and a larger chief ray angle, which in turn improves chip matching. Controlling the ratio of the effective focal length of the first lens to the effective focal length of the eighth lens helps balance field curvature and distortion, improving image quality.

[0135] In this embodiment, the fourth group is movably arranged relative to the third group on the second optical axis. By adjusting the position of the fourth group on the second optical axis, the object distance of the optical imaging lens is adjusted, enabling the optical imaging lens to simultaneously meet the requirements for high-quality long-range and macro photography, while also ensuring the image stabilization function of the optical imaging lens. By slightly tilting, image shift caused by hand tremors during shooting is compensated, and image quality loss due to relative movement is minimized. Specifically, in this application, the optical imaging lens can simultaneously meet the requirements for shooting at object distances of infinity and 300mm.

[0136] In this embodiment, the first lens has positive power; the third lens has positive power; the fourth lens has negative power; and the seventh lens has positive power. The object-side surface of the third lens is convex; the object-side surface of the fifth lens is convex; the image-side surface of the sixth lens is concave; and the object-side surface of the seventh lens is convex. The power and surface shape of each lens facilitates the regulation of light distribution, offsetting positive and negative aberrations for both front and rear aberrations and ensuring image quality.

[0137] In addition, in another optional embodiment of the present application, an optical imaging lens is provided, comprising a first group, a reflective element, a second group, a third group, and a fourth group. The optical imaging lens further comprises a first optical axis and a second optical axis, the first optical axis being perpendicular to the second optical axis, the first group being arranged along the first optical axis, the second group, the third group, and the fourth group being arranged along the second optical axis, and the second group, the third group, and the fourth group being arranged in sequence in a direction away from the reflective element, the reflective element being used to receive light passing through the first group and reflect the light to the second group; the first group comprises a first lens; the second group comprises a second lens; the third group comprises a first lens barrel and a third lens, a fourth lens, and a fifth lens arranged in sequence in the first lens barrel in a direction away from the second group; the fourth group comprises a The optical imaging lens comprises eight lenses, comprising two lens barrels and a sixth lens, a seventh lens, and an eighth lens, which are sequentially arranged in the second lens barrel in a direction away from the third lens group. The fourth lens group further comprises a sixth spacer disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer disposed between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens. The curvature radius R12 of the image side surface of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacer, and the inner diameter d6s of the object side surface of the sixth spacer satisfy the following conditions: 6.19≤R12 / (D6s-d6s)≤8.80. The spacing distance EP67 from the image side surface of the sixth spacer to the object side surface of the seventh spacer on the second optical axis satisfies the following conditions: 10.70≤R13 / EP67≤45.19.

[0138] The optical imaging lens of the present application includes a first group, a reflective element, a second group, a third group, and a fourth group. To correct system chromatic aberration, the curvature radii of the image-side surface of the sixth lens and the object-side surface of the seventh lens are relatively large, making the center positions of the two surfaces flat relative to the edges. When light passes through the edge regions of the image-side surface of the sixth lens and the object-side surface of the seventh lens, internally reflected stray light is easily generated, thereby affecting imaging quality. By rationally matching the outer and inner diameters of the object-side surface of the sixth spacer and the distance between the sixth and seventh spacers, the present application optimizes the surface shape of the image-side surface of the sixth spacer, reduces stray light between the sixth and seventh spacers, and facilitates improved imaging quality.

[0139] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0140] Optionally, the optical imaging lens in the embodiments of the present application can be simulated using software and / or tools such as ZEMAX and CODEV. During the simulation using such software and / or tools, the surface profile of each lens can be appropriately adjusted based on the surface profiles inherent in the software and / or tools used.

[0141] Optionally, the optical imaging lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0142] The optical imaging lens in this application may utilize multiple lenses, such as the eight lenses described above. In this application, at least one of the lens surfaces is an aspheric surface. Aspheric lenses are characterized by a continuously varying curvature from the center to the periphery. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspheric lenses have a better curvature radius characteristic, with the advantages of improving distortion and astigmatism. The use of aspheric lenses can minimize aberrations that occur during imaging, thereby improving image quality.

[0143] In an exemplary embodiment, at least one of the eight lenses may include a trimmed lens. The outer circumference of the trimmed lens may have a trimmed portion and an untrimmed portion, with the outer diameter of the trimmed portion being smaller than the outer diameter of the untrimmed portion. When the outer circumference of a lens has a trimmed portion, the outer diameter of the lens generally refers to the maximum outer diameter of the untrimmed portion of the lens.

[0144] In an exemplary embodiment, the plurality of spacers may include at least one trimmed spacer. The outer circumference of the trimmed spacer may include a trimmed portion and a non-trimmed portion, and the outer diameter of the trimmed portion of the spacer is smaller than the outer diameter of the non-trimmed portion of the spacer. The outer diameter of the spacer generally refers to the maximum outer diameter of the untrimmed portion of the spacer.

[0145] However, those skilled in the art will appreciate that the number of lenses comprising the optical imaging lens can be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while eight lenses are described in the embodiments, the optical imaging lens is not limited to eight lenses. If desired, the optical imaging lens may include other numbers of lenses.

[0146] Figure 1 A schematic structural diagram of an optical imaging lens according to an optional embodiment of the present invention is shown. Figure 2 A schematic diagram showing the dimensions of an optical imaging lens according to an optional embodiment of the present invention is shown. Figure 2 Parameters such as D3s, D4s, d4s, d3s, d6s, D6m, D6s, EP303, EP34, EP406, and E67 are labeled to provide a clear and intuitive understanding of their meaning. To facilitate the description of optical imaging lenses and specific lens surface shapes, these parameters will not be reflected in the accompanying drawings when describing specific embodiments.

[0147] The following further describes examples of specific surface shapes and parameters of the optical imaging lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0148] It should be noted that any one of the following embodiments 1 to 6 is applicable to all implementation methods of the present application.

[0149] Example 1

[0150] like Figures 3 to 14 As shown, the optical imaging lens of embodiment 1 is described. Figure 3 FIG1 shows a schematic structural diagram of the optical imaging lens of Example 1 when the object distance is infinite. Figure 4 A schematic diagram of the optical structure of the optical imaging lens of Example 1 when the object distance is infinite is shown. Figure 9 FIG1 shows a schematic structural diagram of the optical imaging lens of Example 1 when the object distance is 300 mm. Figure 10 The optical structure diagram of the optical imaging lens of the first embodiment is shown when the object distance is 300 mm. Figure 4 and Figure 10 In the figure, the reflective element M is not shown, but in actual application, the reflective element M exists.

[0151] like Figure 3 、 Figure 4 、 Figure 9 and Figure 10 As shown, the optical imaging lens includes a reflective element M, a first group D1 arranged along a first optical axis 10, and a second group D2, a third group D3, and a fourth group D4 arranged along a second optical axis 20. The first optical axis 10 is perpendicular to the second optical axis 20 and intersects at the reflective element M. The second group D2, the third group D3, and the fourth group D4 are arranged in sequence away from the reflective element M. The reflective element M is located between the first group D1 and the second group D2, and is configured to receive light passing through the first group D1 and reflect the light toward the second group D2.

[0152] Specifically, the first lens group D1 is composed of the first lens E1. The second lens group D2 is composed of the second lens E2. The third lens group D3 is composed of the first lens barrel P30 and the third lens E3, the third spacer P3, the fourth lens E4, the fourth spacer P4, and the fifth lens E5, which are sequentially arranged in the first lens barrel P30 in a direction away from the second lens group D2. The fourth lens group D4 is composed of the second lens barrel P40 and the sixth lens E6, the sixth spacer P6, the seventh lens E7, the seventh spacer P7, and the eighth lens E8, which are sequentially arranged in the second lens barrel P40 in a direction away from the third lens group D3.

[0153] In this embodiment, a stop STO is provided between the second lens element E2 and the third lens element E3. A protective glass E9 and an imaging surface S19 are provided on the image side of the eighth lens element E8. The protective glass E9 has an object-side surface S17 and an image-side surface S18.

[0154] In this embodiment, the image side of the fourth spacer P4 is further provided with a fourth auxiliary spacer. The object-side surface and image-side surface of the third spacer P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface of the fourth auxiliary spacer, respectively, and the image-side surface of the fourth auxiliary spacer is in contact with the object-side surface S9 of the fifth lens. The object-side surface and image-side surface of the sixth spacer P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The object-side surface and image-side surface of the seventh spacer P7 are in contact with the image-side surface S14 of the seventh lens and the object-side surface S15 of the eighth lens, respectively.

[0155] In summary, the structural parameters of the optical imaging lens of Example 1 are shown in Table 2.

[0156] Table 2

[0157]

[0158] 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 concave, and the image-side surface S4 of the second lens is convex. 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 concave, and the image-side surface S12 of the sixth lens is concave. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is convex. The object-side surface S15 of the eighth lens is convex, and the image-side surface S16 of the eighth lens is concave.

[0159] In the first embodiment, the effective focal length f of the optical imaging lens is 19.52 mm when the object distance is infinite, and the effective focal length f of the optical imaging lens is 17.47 mm when the object distance is 300 mm.

[0160] In Example 1, the effective focal length f1 of the first lens is 47.14 mm, the effective focal length f2 of the second lens is 3108.57 mm, the effective focal length f3 of the third lens is 8.64 mm, the effective focal length f4 of the fourth lens is -8.87 mm, the effective focal length f5 of the fifth lens is 11.84 mm, the effective focal length f6 of the sixth lens is -11.34 mm, the effective focal length f7 of the seventh lens is 18.02 mm, and the effective focal length f8 of the eighth lens is -15.63 mm.

[0161] Table 3 shows the basic structural parameters of the optical imaging lens of Example 1. The units for the radius of curvature and thickness / distance are all in millimeters. In the table below, OBJ (not shown) is the object distance. STO is the aperture stop.

[0162] Table 3

[0163]

[0164] In Example 1, the object-side surface and the image-side surface of the first lens E1 to the eighth lens E8 are all aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0165] Formula (1).

[0166] Where x is the distance vector from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R, i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above; k is the conic coefficient; and Ai is the correction coefficient for the i-th order of the aspheric surface. Table 4 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspheric mirror surface S1-S16 in Example 1.

[0167] Table 4

[0168]

[0169] Figure 5 The axial chromatic aberration curve of the optical imaging lens of Example 1 when the object distance is infinite is shown, which indicates that the focusing point of light of different wavelengths deviates after passing through the imaging lens. Figure 6 The astigmatism curve of the optical imaging lens of Example 1 when the object distance is infinite is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 7 The distortion curve of the optical imaging lens of Example 1 when the object distance is infinite is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 8 The chromatic aberration curve of the optical imaging lens of Example 1 when the object distance is infinite is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0170] Figure 11 The axial chromatic aberration curve of the optical imaging lens of Example 1 when the object distance is 300 mm is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 12 The astigmatism curve of the optical imaging lens of Example 1 when the object distance is 300 mm is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 13 The distortion curve of the optical imaging lens of Example 1 when the object distance is 300 mm is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 14 The chromatic aberration curve of the optical imaging lens of Example 1 when the object distance is 300 mm is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0171] In summary, the optical imaging lens provided in Example 1 can achieve good imaging quality.

[0172] Example 2

[0173] like Figures 15 to 26 As shown, the optical imaging lens of the second embodiment is described. Figure 15FIG2 shows a schematic structural diagram of the optical imaging lens of Example 2 when the object distance is infinite. Figure 16 A schematic diagram of the optical structure of the optical imaging lens of Example 2 when the object distance is infinite is shown. Figure 21 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 2 when the object distance is 300 mm. Figure 22 The optical structure diagram of the optical imaging lens of the second embodiment is shown when the object distance is 300mm. Figure 16 and Figure 22 In the figure, the reflective element M is not shown, but in actual application, the reflective element M exists.

[0174] like Figure 15 、 Figure 16 、 Figure 21 and Figure 22 As shown, the optical imaging lens includes a reflective element M, a first group D1 arranged along a first optical axis 10, and a second group D2, a third group D3, and a fourth group D4 arranged along a second optical axis 20. The first optical axis 10 is perpendicular to the second optical axis 20 and intersects at the reflective element M. The second group D2, the third group D3, and the fourth group D4 are arranged in sequence away from the reflective element M. The reflective element M is located between the first group D1 and the second group D2, and is configured to receive light passing through the first group D1 and reflect the light toward the second group D2.

[0175] Specifically, the first lens group D1 is composed of the first lens E1. The second lens group D2 is composed of the second lens E2. The third lens group D3 is composed of the first lens barrel P30 and the third lens E3, the third spacer P3, the fourth lens E4, the fourth spacer P4, and the fifth lens E5, which are sequentially arranged in the first lens barrel P30 in a direction away from the second lens group D2. The fourth lens group D4 is composed of the second lens barrel P40 and the sixth lens E6, the sixth spacer P6, the seventh lens E7, the seventh spacer P7, and the eighth lens E8, which are sequentially arranged in the second lens barrel P40 in a direction away from the third lens group D3.

[0176] In this embodiment, a stop STO is provided between the second lens element E2 and the third lens element E3. A protective glass E9 and an imaging surface S19 are provided on the image side of the eighth lens element E8. The protective glass E9 has an object-side surface S17 and an image-side surface S18.

[0177] In this embodiment, the object-side surface and image-side surface of the third spacer P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the sixth spacer P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The object-side surface and image-side surface of the seventh spacer P7 are in contact with the image-side surface S14 of the seventh lens and the object-side surface S15 of the eighth lens, respectively.

[0178] In summary, the structural parameters of the optical imaging lens of Example 2 are shown in Table 5.

[0179] Table 5

[0180]

[0181] 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 concave, and the image-side surface S4 of the second lens is convex. 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 concave, and the image-side surface S12 of the sixth lens is concave. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is convex. The object-side surface S15 of the eighth lens is convex, and the image-side surface S16 of the eighth lens is concave.

[0182] In the second embodiment, the effective focal length f of the optical imaging lens is 19.52 mm when the object distance is infinite, and the effective focal length f of the optical imaging lens is 17.49 mm when the object distance is 300 mm.

[0183] In Example 2, the effective focal length f1 of the first lens is 47.16 mm, the effective focal length f2 of the second lens is 92805.93 mm, the effective focal length f3 of the third lens is 8.56 mm, the effective focal length f4 of the fourth lens is -8.95 mm, the effective focal length f5 of the fifth lens is 12.06 mm, the effective focal length f6 of the sixth lens is -11.47 mm, the effective focal length f7 of the seventh lens is 18.57 mm, and the effective focal length f8 of the eighth lens is -15.60 mm.

[0184] Table 6 shows the basic structural parameters of the optical imaging lens of Example 2, where the units of curvature radius and thickness / distance are all in millimeters. In the following table, OBJ (not shown) is the object distance. STO is the aperture stop.

[0185] Table 6

[0186]

[0187] Table 7 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces S1-S16 in Example 2.

[0188] Table 7

[0189]

[0190] Figure 17 The axial chromatic aberration curve of the optical imaging lens of Example 2 when the object distance is infinite is shown, which indicates that the focusing point of light of different wavelengths deviates after passing through the imaging lens. Figure 18 The astigmatism curve of the optical imaging lens of Example 2 when the object distance is infinite is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 19 The distortion curve of the optical imaging lens of Example 2 when the object distance is infinite is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Figure 20 The chromatic aberration curve of the optical imaging lens of Example 2 when the object distance is infinite is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0191] Figure 23 The axial chromatic aberration curve of the optical imaging lens of Example 2 when the object distance is 300 mm is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 24 The astigmatism curve of the optical imaging lens of Example 2 when the object distance is 300 mm is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 25 The distortion curve of the optical imaging lens of Example 2 when the object distance is 300 mm is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 26 The chromatic aberration curve of the optical imaging lens of Example 2 when the object distance is 300 mm is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0192] In summary, the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0193] Example 3

[0194] like Figures 27 to 38 As shown, the optical imaging lens of embodiment 3 is described. Figure 27 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 3 when the object distance is infinite. Figure 28 A schematic diagram of the optical structure of the optical imaging lens of Example 3 when the object distance is infinite is shown. Figure 33 FIG. 1 shows a schematic structural diagram of the optical imaging lens of Example 3 when the object distance is 300 mm. Figure 34 The optical structure diagram of the optical imaging lens of the third embodiment is shown when the object distance is 300mm. Figure 28 and Figure 34 In the figure, the reflective element M is not shown, but in actual application, the reflective element M exists.

[0195] like Figure 27 、 Figure 28 、 Figure 33 and Figure 34 As shown, the optical imaging lens includes a reflective element M, a first group D1 arranged along a first optical axis 10, and a second group D2, a third group D3, and a fourth group D4 arranged along a second optical axis 20. The first optical axis 10 is perpendicular to the second optical axis 20 and intersects at the reflective element M. The second group D2, the third group D3, and the fourth group D4 are arranged in sequence away from the reflective element M. The reflective element M is located between the first group D1 and the second group D2, and is configured to receive light passing through the first group D1 and reflect the light toward the second group D2.

[0196] Specifically, the first lens group D1 is composed of the first lens E1. The second lens group D2 is composed of the second lens E2. The third lens group D3 is composed of the first lens barrel P30 and the third lens E3, the third spacer P3, the fourth lens E4, the fourth spacer P4, and the fifth lens E5, which are sequentially arranged in the first lens barrel P30 in a direction away from the second lens group D2. The fourth lens group D4 is composed of the second lens barrel P40 and the sixth lens E6, the sixth spacer P6, the seventh lens E7, the seventh spacer P7, and the eighth lens E8, which are sequentially arranged in the second lens barrel P40 in a direction away from the third lens group D3.

[0197] In this embodiment, a stop STO is provided between the second lens element E2 and the third lens element E3. A protective glass E9 and an imaging surface S19 are provided on the image side of the eighth lens element E8. The protective glass E9 has an object-side surface S17 and an image-side surface S18.

[0198] In this embodiment, the image side of the fourth spacer P4 is further provided with a fourth auxiliary spacer. The object-side surface and image-side surface of the third spacer P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface of the fourth auxiliary spacer, respectively, and the image-side surface of the fourth auxiliary spacer is in contact with the object-side surface S9 of the fifth lens. The object-side surface and image-side surface of the sixth spacer P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The object-side surface and image-side surface of the seventh spacer P7 are in contact with the image-side surface S14 of the seventh lens and the object-side surface S15 of the eighth lens, respectively.

[0199] In summary, the structural parameters of the optical imaging lens of Example 3 are shown in Table 8.

[0200] Table 8

[0201]

[0202] 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 concave, and the image-side surface S4 of the second lens is convex. 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 concave, and the image-side surface S12 of the sixth lens is concave. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is convex. The object-side surface S15 of the eighth lens is convex, and the image-side surface S16 of the eighth lens is concave.

[0203] In the third embodiment, the effective focal length f of the optical imaging lens is 19.52 mm when the object distance is infinite, and the effective focal length f of the optical imaging lens is 17.47 mm when the object distance is 300 mm.

[0204] In Example 3, the effective focal length f1 of the first lens is 47.12 mm, the effective focal length f2 of the second lens is 1861.54 mm, the effective focal length f3 of the third lens is 8.61 mm, the effective focal length f4 of the fourth lens is -9.01 mm, the effective focal length f5 of the fifth lens is 11.89 mm, the effective focal length f6 of the sixth lens is -11.06 mm, the effective focal length f7 of the seventh lens is 18.02 mm, and the effective focal length f8 of the eighth lens is -15.40 mm.

[0205] Table 9 shows the basic structural parameters of the optical imaging lens of Example 3. The units for the radius of curvature and thickness / distance are all in millimeters. In the table below, OBJ (not shown) is the object distance. STO is the aperture stop.

[0206] Table 9

[0207]

[0208] Table 10 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces S1-S16 in Example 3.

[0209] Table 10

[0210]

[0211] Figure 29 The axial chromatic aberration curve of the optical imaging lens of Example 3 when the object distance is infinite is shown, which indicates that the focusing point of light of different wavelengths deviates after passing through the imaging lens. Figure 30 The astigmatism curve of the optical imaging lens of Example 3 when the object distance is infinite is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 31 The distortion curve of the optical imaging lens of Example 3 when the object distance is infinite is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 32 The chromatic aberration curve of the optical imaging lens of Example 3 when the object distance is infinite is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0212] Figure 35 The axial chromatic aberration curve of the optical imaging lens of Example 3 when the object distance is 300 mm is shown, which indicates that the focusing point of light of different wavelengths deviates after passing through the imaging lens. Figure 36 The astigmatism curve of the optical imaging lens of Example 3 when the object distance is 300 mm is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 37 The distortion curve of the optical imaging lens of Example 3 when the object distance is 300 mm is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 38 The chromatic aberration curve of the optical imaging lens of Example 3 when the object distance is 300 mm is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0213] In summary, the optical imaging lens provided in Example 3 can achieve good imaging quality.

[0214] Example 4

[0215] like Figures 39 to 50 As shown, the optical imaging lens of Example 4 is described. Figure 39 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 4 when the object distance is infinite. Figure 40 A schematic diagram of the optical structure of the optical imaging lens of Example 4 when the object distance is infinite is shown. Figure 45 FIG. 4 shows a schematic structural diagram of the optical imaging lens of Example 4 when the object distance is 300 mm. Figure 46 The optical structure diagram of the optical imaging lens of the fourth embodiment is shown when the object distance is 300mm. Figure 40 and Figure 46 In the figure, the reflective element M is not shown, but in actual application, the reflective element M exists.

[0216] like Figure 39 、 Figure 40 、 Figure 45 and Figure 46 As shown, the optical imaging lens includes a reflective element M, a first group D1 arranged along a first optical axis 10, and a second group D2, a third group D3, and a fourth group D4 arranged along a second optical axis 20. The first optical axis 10 is perpendicular to the second optical axis 20 and intersects at the reflective element M. The second group D2, the third group D3, and the fourth group D4 are arranged in sequence away from the reflective element M. The reflective element M is located between the first group D1 and the second group D2, and is configured to receive light passing through the first group D1 and reflect the light toward the second group D2.

[0217] Specifically, the first lens group D1 is composed of the first lens E1. The second lens group D2 is composed of the second lens E2. The third lens group D3 is composed of the first lens barrel P30 and the third lens E3, the third spacer P3, the fourth lens E4, the fourth spacer P4, and the fifth lens E5, which are sequentially arranged in the first lens barrel P30 in a direction away from the second lens group D2. The fourth lens group D4 is composed of the second lens barrel P40 and the sixth lens E6, the sixth spacer P6, the seventh lens E7, the seventh spacer P7, and the eighth lens E8, which are sequentially arranged in the second lens barrel P40 in a direction away from the third lens group D3.

[0218] In this embodiment, a stop STO is provided between the second lens element E2 and the third lens element E3. A protective glass E9 and an imaging surface S19 are provided on the image side of the eighth lens element E8. The protective glass E9 has an object-side surface S17 and an image-side surface S18.

[0219] In this embodiment, the image side of the fourth spacer P4 is further provided with a fourth auxiliary spacer. The object-side surface and image-side surface of the third spacer P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface of the fourth auxiliary spacer, respectively, and the image-side surface of the fourth auxiliary spacer is in contact with the object-side surface S9 of the fifth lens. The object-side surface and image-side surface of the sixth spacer P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The object-side surface and image-side surface of the seventh spacer P7 are in contact with the image-side surface S14 of the seventh lens and the object-side surface S15 of the eighth lens, respectively.

[0220] In summary, the structural parameters of the optical imaging lens of Example 4 are shown in Table 11.

[0221] Table 11

[0222]

[0223] 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 concave, and the image-side surface S4 of the second lens is convex. 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 concave, and the image-side surface S12 of the sixth lens is concave. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is convex. The object-side surface S15 of the eighth lens is convex, and the image-side surface S16 of the eighth lens is concave.

[0224] In the fourth embodiment, the effective focal length f of the optical imaging lens is 19.52 mm when the object distance is infinite, and the effective focal length f of the optical imaging lens is 17.46 mm when the object distance is 300 mm.

[0225] In Example 4, the effective focal length f1 of the first lens is 46.70 mm, the effective focal length f2 of the second lens is 1290.02 mm, the effective focal length f3 of the third lens is 8.68 mm, the effective focal length f4 of the fourth lens is -9.13 mm, the effective focal length f5 of the fifth lens is 12.11 mm, the effective focal length f6 of the sixth lens is -11.47 mm, the effective focal length f7 of the seventh lens is 18.93 mm, and the effective focal length f8 of the eighth lens is -15.64 mm.

[0226] Table 12 shows the basic structural parameters of the optical imaging lens of Example 4. The units for the radius of curvature and thickness / distance are all in millimeters. In the table below, OBJ (not shown) is the object distance. STO is the aperture stop.

[0227] Table 12

[0228]

[0229] Table 13 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces S1-S16 in Example 4.

[0230] Table 13

[0231]

[0232] Figure 41 The axial chromatic aberration curve of the optical imaging lens of Example 4 when the object distance is infinite is shown, which indicates that the focusing point of light of different wavelengths deviates after passing through the imaging lens. Figure 42The astigmatism curve of the optical imaging lens of Example 4 when the object distance is infinite is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 43 The distortion curve of the optical imaging lens of Example 4 when the object distance is infinite is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 44 The chromatic aberration curve of the optical imaging lens of Example 4 when the object distance is infinite is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0233] Figure 47 The axial chromatic aberration curve of the optical imaging lens of Example 4 when the object distance is 300 mm is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 48 The astigmatism curve of the optical imaging lens of Example 4 when the object distance is 300 mm is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 49 The distortion curve of the optical imaging lens of Example 4 when the object distance is 300 mm is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 50 The chromatic aberration curve of the optical imaging lens of Example 4 when the object distance is 300 mm is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0234] In summary, the optical imaging lens provided in Example 4 can achieve good imaging quality.

[0235] Example 5

[0236] like Figures 51 to 62 As shown, the optical imaging lens of Example 5 is described. Figure 51 FIG. 4 shows a schematic structural diagram of the optical imaging lens of Example 5 when the object distance is infinite. Figure 52 A schematic diagram of the optical structure of the optical imaging lens of Example 5 when the object distance is infinite is shown. Figure 57 FIG. 4 shows a schematic structural diagram of the optical imaging lens of Example 5 when the object distance is 300 mm. Figure 58 The optical structure diagram of the optical imaging lens of Example 5 is shown when the object distance is 300mm. Figure 52 and Figure 58 In the figure, the reflective element M is not shown, but in actual application, the reflective element M exists.

[0237] like Figure 51 、 Figure 52 、 Figure 57 and Figure 58As shown, the optical imaging lens includes a reflective element M, a first group D1 arranged along a first optical axis 10, and a second group D2, a third group D3, and a fourth group D4 arranged along a second optical axis 20. The first optical axis 10 is perpendicular to the second optical axis 20 and intersects at the reflective element M. The second group D2, the third group D3, and the fourth group D4 are arranged in sequence away from the reflective element M. The reflective element M is located between the first group D1 and the second group D2, and is configured to receive light passing through the first group D1 and reflect the light toward the second group D2.

[0238] Specifically, the first lens group D1 is composed of the first lens E1. The second lens group D2 is composed of the second lens E2. The third lens group D3 is composed of the first lens barrel P30 and the third lens E3, the third spacer P3, the fourth lens E4, the fourth spacer P4, and the fifth lens E5, which are sequentially arranged in the first lens barrel P30 in a direction away from the second lens group D2. The fourth lens group D4 is composed of the second lens barrel P40 and the sixth lens E6, the sixth spacer P6, the seventh lens E7, the seventh spacer P7, and the eighth lens E8, which are sequentially arranged in the second lens barrel P40 in a direction away from the third lens group D3.

[0239] In this embodiment, a stop STO is provided between the second lens element E2 and the third lens element E3. A protective glass E9 and an imaging surface S19 are provided on the image side of the eighth lens element E8. The protective glass E9 has an object-side surface S17 and an image-side surface S18.

[0240] In this embodiment, the object-side surface and image-side surface of the third spacer P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the sixth spacer P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The object-side surface and image-side surface of the seventh spacer P7 are in contact with the image-side surface S14 of the seventh lens and the object-side surface S15 of the eighth lens, respectively.

[0241] In summary, the structural parameters of the optical imaging lens of Example 5 are shown in Table 14.

[0242] Table 14

[0243]

[0244] In Example 5, 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 concave, and the image-side surface S4 of the second lens is convex. 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 concave, and the image-side surface S12 of the sixth lens is concave. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is convex. The object-side surface S15 of the eighth lens is convex, and the image-side surface S16 of the eighth lens is concave.

[0245] In the fifth embodiment, the effective focal length f of the optical imaging lens is 22.10 mm when the object distance is infinite, and the effective focal length f of the optical imaging lens is 19.77 mm when the object distance is 300 mm.

[0246] In Example 5, the effective focal length f1 of the first lens is 54.70 mm, the effective focal length f2 of the second lens is -406.46 mm, the effective focal length f3 of the third lens is 10.22 mm, the effective focal length f4 of the fourth lens is -9.04 mm, the effective focal length f5 of the fifth lens is 11.38 mm, the effective focal length f6 of the sixth lens is -10.13 mm, the effective focal length f7 of the seventh lens is 20.07 mm, and the effective focal length f8 of the eighth lens is -40.27 mm.

[0247] Table 15 shows the basic structural parameters of the optical imaging lens of Example 5. The units for the radius of curvature and thickness / distance are all in millimeters. In the table below, OBJ (not shown) is the object distance. STO is the aperture stop.

[0248] Table 15

[0249]

[0250] Table 16 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces S1-S16 in Example 5.

[0251] Table 16

[0252]

[0253] Figure 53 The axial chromatic aberration curve of the optical imaging lens of Example 5 when the object distance is infinite is shown, which indicates that the focusing point of light of different wavelengths deviates after passing through the imaging lens. Figure 54The astigmatism curve of the optical imaging lens of Example 5 when the object distance is infinite is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 55 The distortion curve of the optical imaging lens of Example 5 when the object distance is infinite is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 56 The chromatic aberration curve of the optical imaging lens of Example 5 when the object distance is infinite is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0254] Figure 59 The axial chromatic aberration curve of the optical imaging lens of Example 5 when the object distance is 300 mm is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 60 The astigmatism curve of the optical imaging lens of Example 5 when the object distance is 300 mm is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 61 The distortion curve of the optical imaging lens of Example 5 when the object distance is 300 mm is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 62 The chromatic aberration curve of the optical imaging lens of Example 5 when the object distance is 300 mm is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0255] In summary, the optical imaging lens provided in Example 5 can achieve good imaging quality.

[0256] Example 6

[0257] like Figures 63 to 74 As shown, the optical imaging lens of Example 6 is described. Figure 63 FIG1 shows a schematic structural diagram of the optical imaging lens of Example 6 when the object distance is infinite. Figure 64 A schematic diagram of the optical structure of the optical imaging lens of Example 6 when the object distance is infinite is shown. Figure 69 FIG. 4 shows a schematic structural diagram of the optical imaging lens of Example 6 when the object distance is 300 mm. Figure 70 The optical structure diagram of the optical imaging lens of Example 6 is shown when the object distance is 300 mm. Figure 64 and Figure 70 In the figure, the reflective element M is not shown, but in actual application, the reflective element M exists.

[0258] like Figure 63 、 Figure 64 、 Figure 69 and Figure 70As shown, the optical imaging lens includes a reflective element M, a first group D1 arranged along a first optical axis 10, and a second group D2, a third group D3, and a fourth group D4 arranged along a second optical axis 20. The first optical axis 10 is perpendicular to the second optical axis 20 and intersects at the reflective element M. The second group D2, the third group D3, and the fourth group D4 are arranged in sequence away from the reflective element M. The reflective element M is located between the first group D1 and the second group D2, and is configured to receive light passing through the first group D1 and reflect the light toward the second group D2.

[0259] Specifically, the first lens group D1 is composed of the first lens E1. The second lens group D2 is composed of the second lens E2. The third lens group D3 is composed of the first lens barrel P30 and the third lens E3, the third spacer P3, the fourth lens E4, the fourth spacer P4, and the fifth lens E5, which are sequentially arranged in the first lens barrel P30 in a direction away from the second lens group D2. The fourth lens group D4 is composed of the second lens barrel P40 and the sixth lens E6, the sixth spacer P6, the seventh lens E7, the seventh spacer P7, and the eighth lens E8, which are sequentially arranged in the second lens barrel P40 in a direction away from the third lens group D3.

[0260] In this embodiment, a stop STO is provided between the second lens element E2 and the third lens element E3. A protective glass E9 and an imaging surface S19 are provided on the image side of the eighth lens element E8. The protective glass E9 has an object-side surface S17 and an image-side surface S18.

[0261] In this embodiment, the object-side surface and image-side surface of the third spacer P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the sixth spacer P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The object-side surface and image-side surface of the seventh spacer P7 are in contact with the image-side surface S14 of the seventh lens and the object-side surface S15 of the eighth lens, respectively.

[0262] In summary, the structural parameters of the optical imaging lens of Example 6 are shown in Table 17.

[0263] Table 17

[0264]

[0265] In Example 6, 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 concave, and the image-side surface S4 of the second lens is convex. 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 concave, and the image-side surface S12 of the sixth lens is concave. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is convex. The object-side surface S15 of the eighth lens is convex, and the image-side surface S16 of the eighth lens is concave.

[0266] In the sixth embodiment, the effective focal length f of the optical imaging lens is 19.51 mm when the object distance is infinite, and the effective focal length f of the optical imaging lens is 17.43 mm when the object distance is 300 mm.

[0267] In Example 6, the effective focal length f1 of the first lens is 44.53 mm, the effective focal length f2 of the second lens is 746.74 mm, the effective focal length f3 of the third lens is 9.56 mm, the effective focal length f4 of the fourth lens is -8.00 mm, the effective focal length f5 of the fifth lens is 9.71 mm, the effective focal length f6 of the sixth lens is -11.92 mm, the effective focal length f7 of the seventh lens is 16.20 mm, and the effective focal length f8 of the eighth lens is -13.83 mm.

[0268] Table 18 shows the basic structural parameters of the optical imaging lens of Example 6. The units for the radius of curvature and thickness / distance are all in millimeters. In the table below, OBJ (not shown) is the object distance. STO is the aperture stop.

[0269] Table 18

[0270]

[0271] Table 19 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces S1-S16 in Example 6.

[0272] Table 19

[0273]

[0274] Figure 65 The axial chromatic aberration curve of the optical imaging lens of Example 6 when the object distance is infinite is shown, which indicates that the focusing point of light of different wavelengths deviates after passing through the imaging lens. Figure 66The astigmatism curve of the optical imaging lens of Example 6 when the object distance is infinite is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 67 The distortion curve of the optical imaging lens of Example 6 when the object distance is infinite is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 68 The chromatic aberration curve of the optical imaging lens of Example 6 when the object distance is infinite is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0275] Figure 71 The axial chromatic aberration curve of the optical imaging lens of Example 6 when the object distance is 300 mm is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 72 The astigmatism curve of the optical imaging lens of Example 6 when the object distance is 300 mm is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 73 The distortion curve of the optical imaging lens of Example 6 when the object distance is 300 mm is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 74 The chromatic aberration curve of the optical imaging lens of Example 6 when the object distance is 300 mm is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0276] In summary, the optical imaging lens provided in Example 6 can achieve good imaging quality.

[0277] In summary, Examples 1 to 6 respectively satisfy the relationships shown in Table 20.

[0278] Table 20

[0279]

[0280] Table 21 shows the effective focal length and other parameters of each lens of the optical imaging lens of Examples 1 to 6. In the following table, ImgH(infinity) is half the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens when the object distance is infinite; HFOV(infinity) is half the maximum field of view angle of the optical imaging lens when the object distance is infinite; Fno(infinity) is the F-number of the optical imaging lens when the object distance is infinite; f(infinity) is the effective focal length of the optical imaging lens when the object distance is infinite; ImgH(300mm) is half the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens when the object distance is 300mm; HFOV(300mm) is half the maximum field of view angle of the optical imaging lens when the object distance is 300mm; Fno(300mm) is the F-number of the optical imaging lens when the object distance is 300mm; and f(300mm) is the effective focal length of the optical imaging lens when the object distance is 300mm. In the table below, parameters not marked with (infinity) and (300mm) are not affected by the object distance.

[0281] Table 21

[0282]

[0283] This application also provides an imaging device, whose electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0284] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0285] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0286] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0287] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An optical imaging lens, characterized in that: The optical imaging lens comprises a first group, a reflective element, a second group, a third group, and a fourth group. The optical imaging lens further comprises a first optical axis and a second optical axis. The first optical axis is perpendicular to the second optical axis. The first group is arranged along the first optical axis. The second group, the third group, and the fourth group are all arranged along the second optical axis. The second group, the third group, and the fourth group are arranged in sequence in a direction away from the reflective element. The reflective element is configured to receive light passing through the first group and reflect the light toward the second group. The first group includes a first lens; the second group includes a second lens; the third group includes a first lens barrel and a third lens, a fourth lens, and a fifth lens sequentially disposed in the first lens barrel in a direction away from the second group; the fourth group includes a second lens barrel and a sixth lens, a seventh lens, and an eighth lens sequentially disposed in the second lens barrel in a direction away from the third group, and the optical imaging lens comprises eight lenses; The fourth group further includes a sixth spacer disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens; The curvature radius R12 of the image side surface of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacer, and the inner diameter d6s of the object side surface of the sixth spacer satisfy the following relationship: 6.19≤R12 / (D6s-d6s)≤8.80; the curvature radius R13 of the object side surface of the seventh lens and the outer diameter D6m of the image side surface of the sixth spacer satisfy the following relationship: 1.34≤R13 / D6m≤5.

41.

2. The optical imaging lens according to claim 1, wherein: The object-side surface of the first lens is a convex surface, and the curvature radius R1 of the object-side surface of the first lens, the refractive index N1 of the first lens, and the center thickness CT1 of the first lens on the first optical axis satisfy: .

3. The optical imaging lens according to claim 1, wherein: The image side surface of the first lens is concave, the object side surface of the second lens is concave, and the curvature radius R2 of the image side surface of the first lens and the curvature radius R3 of the object side surface of the second lens satisfy: -1.45≤R2 / R3≤-1.

01.

4. The optical imaging lens according to claim 1, wherein: The third group further includes a third spacer disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and a fourth spacer disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens.

5. The optical imaging lens according to claim 1 or 3, wherein: The image side surface of the second lens is convex, the object side surface of the third lens is convex, and the curvature radius R4 of the image side surface of the second lens and the curvature radius R5 of the object side surface of the third lens satisfy: -3.69≤R4 / R5≤-0.

85.

6. The optical imaging lens according to claim 3, wherein: The third group further includes a third spacer disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens. The center thickness CT2 of the second lens on the second optical axis and the center thickness CT3 of the third lens on the second optical axis satisfy the following: 1.66≤CT3 / CT2≤2.18; the effective focal length f3 of the third lens, the center thickness CT3 of the third lens on the second optical axis, and the spacing distance EP303 from the object side surface of the first lens barrel to the object side surface of the third spacer on the second optical axis satisfy the following: 3.03≤f3 / (EP303+CT3)≤4.

51.

7. The optical imaging lens according to claim 1, wherein: The image side surface of the third lens is convex, the object side surface of the fourth lens is convex, and the curvature radius R6 of the image side surface of the third lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: 1.09≤|R6-R7| / |R6+R7|≤3.

37.

8. The optical imaging lens according to claim 1, wherein: The third group further includes a third spacer disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens. A curvature radius R6 of the image-side surface of the third lens, an outer diameter D3s of the object-side surface of the third spacer, and an inner diameter d3s of the object-side surface of the third spacer satisfy the following: -12.43≤R6 / (D3s-d3s)≤-2.

93.

9. The optical imaging lens according to claim 4, wherein: The distance EP303 between the object side surface of the first lens barrel and the object side surface of the third spacer on the second optical axis, the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer on the second optical axis, and the air gap T34 between the third lens and the fourth lens on the second optical axis satisfy the following: 14.51≤(EP303+EP34) / T34≤35.

11.

10. The optical imaging lens according to claim 1, wherein: The third group further includes a fourth spacer disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, wherein the image side surface of the fourth lens is a concave surface. The curvature radius R8 of the image side surface of the fourth lens and the center thickness CT4 of the fourth lens on the second optical axis satisfy the following relationship: 4.08≤R8 / CT4≤7.00; the curvature radius R8 of the image side surface of the fourth lens, the outer diameter D4s of the object side surface of the fourth spacer and the inner diameter d4s of the object side surface of the fourth spacer satisfy the following relationship: 1.60≤R8 / (D4s-d4s)≤2.

68.

11. The optical imaging lens according to claim 1, wherein: The fifth lens has positive refractive power, and the image side surface of the fifth lens is convex; the sixth lens has negative refractive power, and the object side surface of the sixth lens is concave; The effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy the following relationship: -1.23≤f6 / f5≤-0.89; the curvature radius R11 of the object-side surface of the sixth lens and the curvature radius R10 of the image-side surface of the fifth lens satisfy the following relationship: 0.99≤R11 / R10≤1.

48.

12. The optical imaging lens according to claim 1, wherein: A distance EP406 between the object side surface of the second lens barrel and the object side surface of the sixth spacer on the second optical axis and a center thickness CT6 of the sixth lens on the second optical axis satisfy the following: 1.89≤EP406 / CT6≤2.

98.

13. The optical imaging lens according to claim 1, wherein: The fourth group further includes a seventh spacer disposed between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens. The spacing distance EP67 from the image side surface of the sixth spacer to the object side surface of the seventh spacer on the second optical axis, the center thickness CT7 of the seventh lens on the second optical axis and the effective focal length f7 of the seventh lens satisfy: 7.18≤f7 / (EP67+CT7)≤10.

20.

14. The optical imaging lens according to claim 1, wherein: The eighth lens has negative optical power, and the effective focal length f1 of the first lens and the effective focal length f8 of the eighth lens satisfy the following relationship: -3.22≤f1 / f8≤-1.

36.

15. The optical imaging lens according to any one of claims 6 to 14, wherein: The fourth group is movably disposed relative to the third group on the second optical axis.

Images