Optical camera lens

Abstract

The application provides an optical camera lens, which only has eight lenses, and sequentially comprises, from an object side to an image side, a first lens, the first lens having a negative focal power, the object side surface of the first lens being a concave surface; a second lens, the second lens having a negative focal power; a third lens, the third lens having a positive focal power; a fourth lens, the fourth lens having a focal power; a fifth lens, the fifth lens having a focal power; a sixth lens, the sixth lens having a focal power; a seventh lens, the seventh lens having a positive focal power, the image side surface of the seventh lens being a convex surface; and an eighth lens, the eighth lens having a negative focal power, the image side surface of the eighth lens being a concave surface; wherein the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy 1.4<|f7 / f8|<1.8. The application solves the problem of poor imaging quality of the optical camera lens in the prior art.

Description

Technical Field

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

[0002] In recent years, with the development of science and technology, people's requirements for optical camera lenses have become increasingly higher, and high-image-quality optical camera lenses are becoming more and more popular. However, in order to improve image quality, existing optical camera lenses use a large number of lenses. For optical camera lenses with eight lenses, the rear lenses, especially the last two lenses, directly affect the way light is incident on the image plane. At the same time, the last two lenses play a significant role in the aberration correction of the optical camera lens. Imperfect light refraction can easily lead to large aberrations and make it difficult to meet the requirements of large aperture and large image plane. Therefore, how to design the effective focal length of the rear lenses of optical camera lenses to improve image quality while ensuring large aperture and large image plane is an urgent problem to be solved. Summary of the Invention

[0003] The main objective of this invention is to provide an optical camera lens to solve the problem of poor imaging quality in existing optical camera lenses.

[0004] To achieve the above objectives, according to one aspect of the present invention, an optical camera lens is provided, the optical camera lens having only eight lenses, the eight lenses sequentially comprising, from the object side to the image side: a first lens having negative optical power, the object side of the first lens being concave; a second lens having negative optical power; a third lens having positive optical power; a fourth lens having optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having positive optical power, the image side of the seventh lens being convex; and an eighth lens having negative optical power, the image side of the eighth lens being concave; wherein, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy the condition: 1.4 < |f7 / f8| < 1.8.

[0005] According to another aspect of the present invention, an optical camera lens is provided, the optical camera lens having only eight lenses, the eight lenses sequentially comprising, from the object side to the image side: a first lens having negative optical power, the object side of the first lens being concave; a second lens having negative optical power; a third lens having positive optical power; a fourth lens having optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having positive optical power, the image side of the seventh lens being convex; and an eighth lens having negative optical power, the image side of the eighth lens being concave; wherein the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy the following condition: 3.8 < (|f7| + |f8|) / (|f7| - |f8|) < 5.6. This application controls the optical power of each lens, the surface shape and effective focal length of the first lens, the seventh lens and the eighth lens, and controls the deflection direction of the rear lens, especially the seventh lens and the eighth lens, so that the optical camera lens has sufficient field curvature correction capability, light convergence capability and back focus control capability, thereby ensuring a large image plane and high image quality imaging effect.

[0006] According to another aspect of the present invention, an optical camera lens is provided, the optical camera lens having only eight lenses, the eight lenses sequentially comprising, from object side to image side: a first lens having negative optical power, the object side of the first lens being concave; a second lens having negative optical power; a third lens having positive optical power; a fourth lens having optical power; a fifth lens having optical power; a sixth lens having optical power; a seventh lens having positive optical power, the image side of the seventh lens being convex; and an eighth lens having negative optical power, the image side of the eighth lens being concave; wherein, the radius of curvature R15 of the object side of the eighth lens, the radius of curvature R16 of the image side of the eighth lens, the distance T78 from the image side of the seventh lens to the object side of the eighth lens along the optical axis of the optical camera lens, and the center thickness CT8 of the eighth lens on the optical axis satisfy: 9.5 < (|R15| + |R16|) / (T78 + CT8) < 68.5. This application controls the deflection direction of the rear lens, especially the seventh and eighth lenses, by controlling the optical power of each lens, the surface shape, radius of curvature, thickness and spacing of the first, seventh and eighth lenses, so that the optical camera lens has sufficient field curvature correction capability, light convergence capability and back focus control capability, thereby ensuring a large image plane and high image quality imaging effect.

[0007] Furthermore, the radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, and the effective focal length f1 of the first lens satisfy the following condition: 0.2 < (|R1| + |R2|) / |f1| < 7.4.

[0008] Furthermore, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the center thickness CT3 of the third lens on the optical axis of the camera lens, and the center thickness CT4 of the fourth lens on the optical axis satisfy the following condition: 59.1 < |f3|*|f4| / (CT3*CT4) < 660.8.

[0009] Furthermore, the center thickness CT2 of the second lens on the optical axis of the optical camera lens and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 2.7 < (CT2 + CT1) / (CT2 - CT1) < 8.6.

[0010] Furthermore, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the radius of curvature R11 of the object side of the sixth lens, and the radius of curvature R12 of the image side of the sixth lens satisfy the following: 0.4 < (|f5| + |f6|) / (|R11| + |R12|) < 41.8.

[0011] Furthermore, the diagonal length of half the effective pixel area on the imaging plane of the optical camera lens, ImgH, and the entrance pupil diameter, EPD, satisfy the following relationship: 0.8 <ImgH / EPD<1.1。

[0012] Furthermore, the distance TD between the object-side surface of the first lens and the image-side surface of the eighth lens on the optical axis of the optical camera lens, and ImgH, half the diagonal length of the effective pixel area on the imaging plane of the optical camera lens, satisfy: 1.7 <TD / ImgH<2.1。

[0013] Furthermore, the fifth or sixth lens is made of glass.

[0014] Furthermore, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy the following condition: 3.8 < (|f7| + |f8|) / (|f7| - |f8|) < 5.6.

[0015] Furthermore, the dispersion coefficients V2 of the second lens, V5 of the fifth lens, and V1 of the first lens satisfy the following condition: 1.9 < (V2 + V5) / V1 < 4.9.

[0016] Furthermore, the dispersion coefficients V5, V4, and V8 of the fifth lens satisfy the following condition: 0.6 < (V5 + V8) / V4 < 4.6.

[0017] Furthermore, the radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens, and the center thickness CT3 of the third lens on the optical axis of the optical camera lens satisfy the following condition: 10.0 < (|R3+R4|) / CT3 < 49.6.

[0018] Furthermore, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the center thickness CT4 of the fourth lens on the optical axis of the camera lens, and the center thickness CT5 of the fifth lens on the optical axis satisfy the following condition: 10.1 < (|f4| + |f5|) / |CT4 - CT5| < 29.1.

[0019] Furthermore, the axial distance TTL between the object-side surface of the first lens and the imaging surface of the optical camera lens, the distance T67 between the image-side surface of the sixth lens and the object-side surface of the seventh lens along the optical axis of the optical camera lens, and the center thickness CT7 of the seventh lens on the optical axis satisfy the following condition: 4.3 <TTL / (T67+CT7)<8.8。

[0020] Furthermore, the radius of curvature R15 of the object side of the eighth lens, the radius of curvature R16 of the image side of the eighth lens, the distance T78 from the image side of the seventh lens to the object side of the eighth lens along the optical axis of the optical camera lens, and the center thickness CT8 of the eighth lens on the optical axis satisfy the following: 9.5 < (|R15| + |R16|) / (T78 + CT8) < 68.5.

[0021] Applying the technical solution of this invention, the optical camera lens has only eight lenses, which are sequentially arranged from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens has negative optical power, and its object side is concave. The second lens has negative optical power; the third lens has positive optical power; the fourth lens has optical power; the fifth lens has optical power; the sixth lens has optical power; the seventh lens has positive optical power, and its image side is convex. The eighth lens has negative optical power, and its image side is concave. The effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy the following condition: 1.4 < |f7 / f8| < 1.8.

[0022] This application controls the optical power of each lens, the surface shape of the first lens, the seventh lens, and the eighth lens, as well as the effective focal length. This allows the rear-end lenses, especially the seventh and eighth lenses, to control the light entering the image plane, thereby controlling the astigmatism of the optical camera lens and improving the imaging quality of the off-axis field of view. This enables the optical camera lens to have sufficient field curvature correction capability, light convergence capability, and back focus control capability, thus ensuring a large image plane and high image quality imaging effect. Attached Figure Description

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

[0024] Figure 1 A schematic diagram of the structure of the optical camera lens according to Embodiment 1 of the present invention is shown;

[0025] Figures 2 to 4 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of Embodiment 1 of the present invention are shown respectively.

[0026] Figure 5 A schematic diagram of the structure of the optical camera lens according to Embodiment 2 of the present invention is shown;

[0027] Figures 6 to 8 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of Embodiment 2 of the present invention are shown respectively;

[0028] Figure 9 A schematic diagram of the structure of the optical camera lens according to Embodiment 3 of the present invention is shown;

[0029] Figures 10 to 12 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of Embodiment 3 of the present invention are shown respectively;

[0030] Figure 13 A schematic diagram of the structure of the optical camera lens of Embodiment 4 of the present invention is shown;

[0031] Figures 14 to 16 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of Embodiment 4 of the present invention are shown respectively;

[0032] Figure 17 A schematic diagram of the structure of the optical camera lens of Embodiment 5 of the present invention is shown;

[0033] Figures 18 to 20 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of Embodiment 5 of the present invention are shown respectively;

[0034] Figure 21 A schematic diagram of the structure of the optical camera lens of Embodiment Six of the present invention is shown;

[0035] Figures 22 to 24 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of Embodiment Six of the present invention are shown respectively;

[0036] Figure 25 A schematic diagram of the structure of the optical camera lens of Embodiment 7 of the present invention is shown;

[0037] Figures 26 to 28The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of Embodiment Seven of the present invention are shown respectively.

[0038] The above figures include the following reference numerals:

[0039] E1, First lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; E2, Second lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; E3, Third lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; E4, Fourth lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens; E5, Fifth lens; S9, Object-side surface of the fifth lens; S10, Image-side surface of the fifth lens; E6, Sixth lens; S11, Object-side surface of the sixth lens; S12, Image-side surface of the sixth lens; E7, Seventh lens; S13, Object-side surface of the seventh lens; S14, Image-side surface of the seventh lens; E8, Eighth lens; S15, Object-side surface of the eighth lens; S16, Image-side surface of the eighth lens; IMG, Imaging plane. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0042] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0043] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0044] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object side is called the object-side surface of the lens, and the surface of each lens closest to the image side is called the image-side surface of the lens. The surface shape in the paraxial region can be determined according to the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the object-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0045] To address the problem of poor imaging quality in existing optical camera lenses, this invention provides an optical camera lens.

[0046] First Implementation Method

[0047] like Figures 1 to 28 As shown, the optical camera lens has only eight lenses, which are sequentially arranged from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens has negative optical power and its object side is concave; the second lens has negative optical power; the third lens has positive optical power; the fourth lens has optical power; the fifth lens has optical power; the sixth lens has optical power; the seventh lens has positive optical power and its image side is convex; the eighth lens has negative optical power and its image side is concave. The effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy the following condition: 1.4 < |f7 / f8| < 1.8.

[0048] This application controls the optical power of each lens, the surface shape of the first lens, the seventh lens, and the eighth lens, as well as the effective focal length. This allows the rear-end lenses, especially the seventh and eighth lenses, to control the light entering the image plane, thereby controlling the astigmatism of the optical camera lens and improving the imaging quality of the off-axis field of view. This enables the optical camera lens to have sufficient field curvature correction capability, light convergence capability, and back focus control capability, thus ensuring a large image plane and high image quality imaging effect.

[0049] In addition, the optical camera lens of this application is designed with a first lens having negative optical power, which can reduce the incident angle of light rays incident on the aperture and increase the lens aperture. It can also have good shooting quality in low ambient light and can also make the light smoothly transition to the rear lens, effectively reducing aberrations. The second lens is designed with negative optical power, which can further reduce the incident angle of large-angle light rays. Combined with the optical power design of each lens, the eight-element optical camera lens has the advantages of large aperture, large image plane and high image quality.

[0050] Preferably, 1.42 < |f7 / f8| < 1.78.

[0051] In this embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f1 of the first lens satisfy the following condition: 0.2 < (|R1| + |R2|) / |f1| < 7.4. If the value of (|R1| + |R2|) / |f1| is too large, the distribution of the radius of curvature of the object-side surface and the image-side surface of the first lens will have a large difference. If the value of (|R1| + |R2|) / |f1| is too small, the optical power will be insufficient. By limiting (|R1| + |R2|) / |f1| to a reasonable range, the system beam can be effectively controlled to have good light smoothness in the first lens, which can effectively reduce aberrations and correct the final image quality. Preferably, 0.25 < (|R1| + |R2|) / |f1| < 7.35.

[0052] In this embodiment, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the center thickness CT3 of the third lens on the optical axis of the optical camera lens, and the center thickness CT4 of the fourth lens on the optical axis satisfy the following condition: 59.1 < |f3|*|f4| / (CT3*CT4) < 660.8. If the value of |f3|*|f4| / (CT3*CT4) is too large, the focal lengths of the third and fourth lenses will be too large, and the light refraction ability will be weakened. If the value of |f3|*|f4| / (CT3*CT4) is too small, the thicknesses of the third and fourth lenses will be too large, resulting in an excessively large overall length of the optical camera lens. By limiting |f3|*|f4| / (CT3*CT4) within a reasonable range, a reasonable distribution of optical power and a smaller overall system length can be achieved, which is beneficial for the optical camera lens to achieve both high image quality and miniaturization. Preferably, 59.15 < |f3|*|f4| / (CT3*CT4) < 660.78.

[0053] In this embodiment, the center thickness CT2 of the second lens on the optical axis of the optical camera lens and the center thickness CT1 of the first lens on the optical axis satisfy: 2.7 < (CT2 + CT1) / (CT2 - CT1) < 8.6. By restricting (CT2 + CT1) / (CT2 - CT1) within a reasonable range, the center thicknesses of the first lens and the second lens can be controlled, and the imaging performance can be improved as much as possible on the premise of ensuring processability. Preferably, 2.75 < (CT2 + CT1) / (CT2 - CT1) < 8.58.

[0054] In this embodiment, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the curvature radius R11 of the object side surface of the sixth lens, and the curvature radius R12 of the image side surface of the sixth lens satisfy: 0.4 < (|f5| + |f6|) / (|R11| + |R12|) < 41.8. If the value of (|f5| + |f6|) / (|R11| + |R12|) is too large, the focal lengths of the fifth lens and the sixth lens are too large, which is not conducive to the refraction of light. If the value of (|f5| + |f6|) / (|R11| + |R12|) is too small, the curvature radius of the sixth lens is too large, which is not conducive to imaging. By restricting (|f5| + |f6|) / (|R11| + |R12|) within a reasonable range, the optical power can be reasonably distributed and the imaging quality can be ensured. Preferably, 0.42 < (|f5| + |f6|) / (|R11| + |R12|) < 41.75.

[0055] In this embodiment, half of the diagonal length ImgH of the effective pixel region on the imaging surface of the optical camera lens and the entrance pupil diameter EPD of the optical camera lens satisfy: 0.8 < ImgH / EPD < 1.1. If the value of ImgH / EPD is too large, the entrance pupil diameter is too small, and the light input amount is reduced, affecting the imaging time and quality. If the value of ImgH / EPD is too small, the imaging surface is not large enough. By restricting ImgH / EPD within a reasonable range, sufficient light input amount and a large image surface size can be ensured. Preferably, 0.85 < ImgH / EPD < 1.08.

[0056] In this embodiment, the distance TD from the object side surface of the first lens to the image side surface of the eighth lens on the optical axis of the optical camera lens and half of the diagonal length ImgH of the effective pixel region on the imaging surface of the optical camera lens satisfy: 1.7 < TD / ImgH < 2.1. If the value of TD / ImgH is too large, TD is too large, which will further lead to an overly large size of the optical camera lens. If the value of TD / ImgH is too small, the image surface is too large, and sufficient performance support cannot be guaranteed. By restricting TD / ImgH within a reasonable range, a smaller total length of the optical camera lens and a good image surface size can be ensured. Preferably, 1.71 < TD / ImgH < 2.05.

[0057] In this embodiment, the fifth or sixth lens is made of glass. The Abbe number of the glass can be used in combination with the resin lens to reduce chromatic aberration and enhance the performance of the optical camera lens.

[0058] In this embodiment, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy the following condition: 3.8 < (|f7|+|f8|) / (|f7|-|f8|) < 5.6. By limiting (|f7|+|f8|) / (|f7|-|f8|) within a reasonable range, the light entering the image plane can be controlled effectively using the rear lens, thereby controlling the astigmatism of the optical camera lens and improving the imaging quality of the off-axis field of view. Preferably, 3.805 < (|f7|+|f8|) / (|f7|-|f8|) < 5.545.

[0059] In this embodiment, the dispersion coefficients V2 and V5 of the second lens and the first lens satisfy the following relationship: 1.9 < (V2 + V5) / V1 < 4.9. By limiting (V2 + V5) / V1 to a reasonable range, chromatic aberration can be optimized by utilizing the mixture of large gradient dispersion coefficients possessed by repeating high and low refractive index materials. Preferably, 1.91 < (V2 + V5) / V1 < 4.85.

[0060] In this embodiment, the dispersion coefficients V5 of the fifth lens, V4 of the fourth lens, and V8 of the eighth lens satisfy the following condition: 0.6 < (V5 + V8) / V4 < 4.6. By limiting (V5 + V8) / V4 to a reasonable range, chromatic aberration can be optimized by utilizing the mixture of large gradient dispersion coefficients possessed by repeating high and low refractive index materials. Preferably, 0.64 < (V5 + V8) / V4 < 4.58.

[0061] In this embodiment, the radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens, and the center thickness CT3 of the third lens on the optical axis of the optical camera lens satisfy the following condition: 10.0 < (|R3+R4|) / CT3 < 49.6. By limiting (|R3+R4|) / CT3 within a reasonable range, the light beam of the optical camera lens can be effectively controlled to have good light smoothness in the second and third lenses, which can effectively reduce aberrations and correct the final image quality. Preferably, 10.05 < (|R3+R4|) / CT3 < 49.59.

[0062] In this embodiment, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the central thickness CT4 of the fourth lens on the optical axis of the optical imaging lens, and the central thickness CT5 of the fifth lens on the optical axis satisfy: 10.1 < (|f4| + |f5|) / |CT4 - CT5| < 29.1. By limiting (|f4| + |f5|) / |CT4 - CT5| within a reasonable range, the light beam of the optical imaging lens can be effectively controlled to have better light smoothness between the fourth lens and the fifth lens, the aberration can be effectively reduced, and the final imaging quality can be corrected. Preferably, 10.12 < (|f4| + |f5|) / |CT4 - CT5| < 29.05.

[0063] In this embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens, the distance T67 from the image side surface of the sixth lens to the object side surface of the seventh lens along the optical axis direction of the optical imaging lens, and the central thickness CT7 of the seventh lens on the optical axis satisfy: 4.3 < TTL / (T67 + CT7) < 8.8. If the value of TTL / (T67 + CT7) is too large, then TTL is too long. If the value of TTL / (T67 + CT7) is too small, then the central thickness of the seventh lens is too small, which is likely to cause difficulties in molding and processing. By limiting TTL / (T67 + CT7) within a reasonable range, it can be ensured that the optical imaging lens has a smaller total length and a more reasonable lens thickness ratio. Preferably, 4.35 < TTL / (T67 + CT7) < 8.78.

[0064] In this embodiment, the radius of curvature R15 of the object side surface of the eighth lens, the radius of curvature R16 of the image side surface of the eighth lens, the distance T78 from the image side surface of the seventh lens to the object side surface of the eighth lens along the optical axis direction of the optical imaging lens, and the central thickness CT8 of the eighth lens on the optical axis satisfy: 9.5 < (|R15| + |R16|) / (T78 + CT8) < 68.5. If the value of (|R15| + |R16|) / (T78 + CT8) is too large, the light deflection ability of the eighth lens is too low to correct the field curvature well. If the value of (|R15| + |R16|) / (T78 + CT8) is too small, the thickness of the eighth lens is too large, which will affect the back focal length and the length of the optical imaging lens. By limiting (|R15| + |R16|) / (T78 + CT8) within a reasonable range, the field curvature of the optical imaging lens can be optimized and the lens length can be ensured. Preferably, 9.52 < (|R15| + |R16|) / (T78 + CT8) < 68.45. It should be noted that the optical imaging lens of this application satisfies f / EPD < 2. Under this condition, the performance indicators of the optical imaging system are poor, the aberration is large, and the imaging quality is difficult to meet the requirements. However, through the design of this application, the characteristics of large aperture, large image surface, and high image quality can be achieved.

[0065] Second Implementation Method

[0066] like Figures 1 to 28 As shown, the optical camera lens has only eight lenses, which are sequentially arranged from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens has negative optical power and its object side is concave; the second lens has negative optical power; the third lens has positive optical power; the fourth lens has optical power; the fifth lens has optical power; the sixth lens has optical power; the seventh lens has positive optical power and its image side is convex; the eighth lens has negative optical power and its image side is concave. The effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy the following condition: 3.8 < (|f7| + |f8|) / (|f7| - |f8|) < 5.6.

[0067] This application controls the optical power of each lens, the surface shape and effective focal length of the first lens, the seventh lens and the eighth lens, and controls the deflection direction of the rear lens, especially the seventh lens and the eighth lens, so that the optical camera lens has sufficient field curvature correction capability, light convergence capability and back focus control capability, thereby ensuring a large image plane and high image quality imaging effect.

[0068] In addition, the optical camera lens of this application is designed with a first lens having negative optical power, which can reduce the incident angle of light rays incident on the aperture and increase the lens aperture. It can also have good shooting quality in low ambient light and can also make the light smoothly transition to the rear lens, effectively reducing aberrations. The second lens is designed with negative optical power, which can further reduce the incident angle of large-angle light rays. Combined with the optical power design of each lens, the eight-element optical camera lens has the advantages of large aperture, large image plane and high image quality.

[0069] Preferably, 3.805 < (|f7| + |f8|) / (|f7| - |f8|) < 5.545.

[0070] This embodiment may also include other conditional expressions from the first embodiment, which will not be elaborated here.

[0071] Third Implementation Method

[0072] like Figures 1 to 28As shown, the optical camera lens has only eight lenses, which are sequentially arranged from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens has negative optical power and its object side is concave; the second lens has negative optical power; the third lens has positive optical power; the fourth lens has optical power; the fifth lens has optical power; the sixth lens has optical power; the seventh lens has positive optical power and its image side is convex; the eighth lens has negative optical power and its image side is concave. Among them, the radius of curvature R15 of the object side of the eighth lens, the radius of curvature R16 of the image side of the eighth lens, the distance T78 from the image side of the seventh lens to the object side of the eighth lens along the optical axis of the optical camera lens, and the center thickness CT8 of the eighth lens on the optical axis satisfy the following: 9.5 < (|R15| + |R16|) / (T78 + CT8) < 68.5.

[0073] This application controls the deflection direction of the rear lens, especially the seventh and eighth lenses, by controlling the optical power of each lens, the surface shape, radius of curvature, thickness and spacing of the first, seventh and eighth lenses, so that the optical camera lens has sufficient field curvature correction capability, light convergence capability and back focus control capability, thereby ensuring a large image plane and high image quality imaging effect.

[0074] If the value of (|R15|+|R16|) / (T78+CT8) is too large, the refractive power of the eighth lens will be too low, and it will not be able to correct the field curvature well. If the value of (|R15|+|R16|) / (T78+CT8) is too small, the thickness of the eighth lens will be too large, which will affect the back focal length and the length of the optical camera lens. By limiting (|R15|+|R16|) / (T78+CT8) within a reasonable range, the field curvature of the optical camera lens can be optimized and the lens length can be guaranteed.

[0075] Furthermore, the optical camera lens of this application, by designing the first lens to have negative optical power, can reduce the incident angle of light rays incident on the aperture stop, increase the lens aperture, and maintain good shooting quality even in low ambient light. It can also ensure that light is smoothly transferred to the rear lens, effectively reducing aberrations. The second lens is designed to have negative optical power, which can further reduce the incident angle of large-angle light rays. By combining the design of the optical power of each lens with the control of the thickness and spacing of the rear lens, the eight-element optical camera lens has the advantages of large aperture, large image plane, high image quality, and miniaturization.

[0076] Preferably, 9.52 < (|R15| + |R16|) / (T78 + CT8) < 68.45.

[0077] This embodiment may also include other conditional expressions from the first embodiment, which will not be elaborated here.

[0078] Optionally, the aforementioned optical camera lens may also include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0079] The optical camera lens in this application can employ multiple lenses, such as the eight lenses mentioned above. By rationally allocating the optical power, surface shape, center thickness of each lens, and on-axis distance between lenses, the aperture of the optical camera lens can be effectively increased, the lens sensitivity reduced, and the lens's manufacturability improved. This makes the optical camera lens more suitable for manufacturing and processing, and applicable to portable electronic devices such as smartphones. The aforementioned optical camera lens also possesses advantages such as large aperture, wide field of view, ultra-thin design, and excellent image quality, meeting the miniaturization requirements of smart electronic products.

[0080] In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0081] However, those skilled in the art will understand that the number of lenses constituting the optical camera lens can be changed to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although an embodiment is described using eight lenses as an example, the optical camera lens is not limited to including eight lenses. If necessary, the optical camera lens may also include other numbers of lenses.

[0082] The following describes in further detail, with reference to the accompanying drawings, embodiments of the optical camera lens applicable to the above embodiments, including specific surface shapes and parameters.

[0083] Example 1

[0084] like Figures 1 to 4 As shown, an optical camera lens according to Embodiment 1 of this application is described. Figure 1 A schematic diagram of the optical camera lens of Embodiment 1 is shown.

[0085] like Figure 1 As shown, the optical camera lens includes, from the object side to the image side, the following elements in sequence: first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, and imaging plane IMG.

[0086] The first lens E1 has negative optical power, with its object-side surface S1 and image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 and image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens E8 has negative optical power. The object-side surface S15 of the eighth lens is concave, and the image-side surface S16 of the eighth lens is concave. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging plane IMG.

[0087] Table 1 shows the basic structural parameters of the optical camera lens in Embodiment 1, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0088]

[0089]

[0090] Table 1

[0091] In Embodiment 1, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0092]

[0093] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1-S16 in Example 1.

[0094]

[0095]

[0096] Table 2

[0097] Figure 2 The on-axis chromatic aberration curve of the optical camera lens of Embodiment 1 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical camera lens. Figure 3 The astigmatism curve of the optical camera lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4 The distortion curve of the optical camera lens of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0098] according to Figures 2 to 4 As can be seen, the optical camera lens given in Example 1 can achieve good imaging quality.

[0099] Example 2

[0100] like Figures 5 to 8 As shown, an optical camera lens according to Embodiment 2 of this application is described. Figure 5 A schematic diagram of the optical camera lens of Embodiment 2 is shown. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0101] like Figure 5 As shown, the optical camera lens includes, from the object side to the image side, the following elements in sequence: first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, and imaging plane IMG.

[0102] The first lens E1 has negative optical power, with its object-side surface S1 and image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 and image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens E8 has negative optical power. The object-side surface S15 of the eighth lens is concave, and the image-side surface S16 of the eighth lens is concave. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging plane IMG.

[0103] Table 3 shows the basic structural parameters of the optical camera lens in Embodiment 2, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0104] Face number Surface type radius of curvature thickness Refractive index Dispersion coefficient (Abbe number) Conic coefficient OBJ spherical endless endless STO spherical endless 0.52 S1 aspherical -25.96 0.28 1.66 16.51 0 S2 aspherical 86.66 0.28 0 S3 aspherical -3.57 0.58 1.62 21.56 0 S4 aspherical -4.12 0.04 0 S5 aspherical 6.07 0.77 1.54 56.00 0 S6 aspherical -13.53 0.04 0 S7 aspherical -14.13 1.60 1.54 56.00 0 S8 aspherical -4.13 0.04 0 S9 aspherical 3.29 0.59 1.75 12.00 0 S10 aspherical 2.47 1.18 -1 S11 aspherical -53.84 0.93 1.54 56.00 0 S12 aspherical -27.12 0.62 0 S13 aspherical 35.23 0.57 1.56 43.12 0 S14 aspherical -5.10 0.80 0 S15 aspherical -57.16 0.27 1.60 25.86 0 S16 aspherical 2.96 1.33 -1 IMG spherical endless

[0105] Table 3

[0106] Table 4 gives the higher-order coefficients that can be used for each aspherical lens S1-S16 in Example 2. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) in Example 1.

[0107]

[0108]

[0109] Table 4

[0110] Figure 6 The on-axis chromatic aberration curve of the optical camera lens of Embodiment 2 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical camera lens. Figure 7 The astigmatism curve of the optical camera lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8 The distortion curve of the optical camera lens of Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0111] according to Figures 6 to 8 It can be seen that the optical camera lens given in Example 2 can achieve good imaging quality.

[0112] Example 3

[0113] like Figures 9 to 12 As shown, an optical camera lens according to Embodiment 3 of this application is described. Figure 9 A schematic diagram of the optical camera lens of Embodiment 3 is shown. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0114] like Figure 9 As shown, the optical camera lens includes, from the object side to the image side, the following elements in sequence: first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, and imaging plane IMG.

[0115] The first lens E1 has negative optical power, with both its object-side surface S1 and image-side surface S2 being concave. The second lens E2 has negative optical power, with both its object-side surface S3 and image-side surface S4 being convex. The third lens E3 has positive optical power, with both its object-side surface S5 and image-side surface S6 being convex. The fourth lens E4 has positive optical power, with both its object-side surface S7 and image-side surface S8 being convex. The fifth lens E5 has negative optical power, with both its object-side surface S9 and image-side surface S10 being concave. The sixth lens E6 has negative optical power, with both its object-side surface S11 and image-side surface S12 being convex. The seventh lens E7 has positive optical power, with both its object-side surface S13 and image-side surface S14 being convex. The eighth lens E8 has negative optical power. The object-side surface S15 of the eighth lens is concave, and the image-side surface S16 of the eighth lens is concave. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging plane IMG.

[0116] Table 5 shows the basic structural parameters of the optical camera lens in Embodiment 3, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0117] Face number Surface type radius of curvature thickness Refractive index Dispersion coefficient (Abbe number) Conic coefficient OBJ spherical endless endless STO spherical endless 0.50 S1 aspherical -26.97 0.27 1.66 17.19 0 S2 aspherical 73.34 0.28 0 S3 aspherical -3.58 0.57 1.62 21.85 0 S4 aspherical -4.12 0.04 0 S5 aspherical 6.28 0.76 1.54 56.00 0 S6 aspherical -12.61 0.04 0 S7 aspherical -15.06 1.59 1.54 56.00 0 S8 aspherical -4.16 0.04 0 S9 aspherical 3.31 0.57 1.75 12.00 0 S10 aspherical 2.48 1.17 -1 S11 aspherical -59.35 0.93 1.54 56.00 0 S12 aspherical -61.00 0.61 0 S13 aspherical 22.33 0.59 1.56 44.19 0 S14 aspherical -4.94 0.80 0 S15 aspherical -60.56 0.27 1.59 26.47 0 S16 aspherical 2.96 1.34 -1 IMG spherical endless

[0118] Table 5

[0119] Table 6 gives the higher-order coefficients that can be used for each aspherical lens S1-S16 in Example 3. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) in Example 1.

[0120]

[0121]

[0122] Table 6

[0123] Figure 10 The on-axis chromatic aberration curve of the optical camera lens of Embodiment 3 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical camera lens. Figure 11 The astigmatism curve of the optical camera lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12 The distortion curve of the optical camera lens of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0124] according to Figures 10 to 12 It can be seen that the optical camera lens given in Example 3 can achieve good imaging quality.

[0125] Example 4

[0126] like Figures 13 to 16 As shown, an optical camera lens according to Embodiment 4 of this application is described. Figure 13 A schematic diagram of the optical camera lens of Embodiment 4 is shown. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0127] like Figure 13 As shown, the optical camera lens includes, from the object side to the image side, the following elements in sequence: first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, and imaging plane IMG.

[0128] The first lens E1 has negative optical power, its object-side surface S1 is concave, and its image-side surface S2 is convex. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has negative optical power, its object-side surface S7 is concave, and its image-side surface S8 is concave. The fifth lens E5 has positive optical power, its object-side surface S9 is concave, and its image-side surface S10 is convex. The sixth lens E6 has negative optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens E7 has positive optical power, its object-side surface S13 is concave, and its image-side surface S14 is convex. The eighth lens E8 has negative optical power. The object-side surface S15 of the eighth lens is convex, and the image-side surface S16 of the eighth lens is concave. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging plane IMG.

[0129] Table 7 shows the basic structural parameters of the optical camera lens in Embodiment 4, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0130] Face number Surface type radius of curvature thickness Refractive index Dispersion coefficient (Abbe number) Conic coefficient OBJ spherical endless endless STO spherical endless 0.10 S1 aspherical -3.64 0.35 1.61 23.17 0 S2 aspherical -4.75 0.09 0 S3 aspherical 11.18 0.44 1.54 56.00 0 S4 aspherical 9.20 0.11 0 S5 aspherical 6.99 0.41 1.58 30.11 0 S6 aspherical -7.87 0.06 0 S7 aspherical -8.64 0.20 1.65 17.64 0 S8 aspherical 17.13 0.05 0 S9 aspherical -56.03 1.74 1.54 56.00 0 S10 aspherical -3.53 0.04 -1 S11 aspherical 3.51 0.91 1.75 12.00 0 S12 aspherical 2.70 1.19 -1 S13 aspherical -29.54 1.08 1.54 56.00 0 S14 aspherical -4.13 1.52 0 S15 aspherical 15.18 0.37 1.60 24.08 0 S16 aspherical 2.92 1.33 -1 IMG spherical endless

[0131] Table 7

[0132] Table 8 gives the higher-order coefficients that can be used for each aspherical lens S1-S16 in Example 4. The surface shape of each aspherical lens can be defined by, but is not limited to, the formula (1) in Example 1.

[0133]

[0134]

[0135] Table 8

[0136] Figure 14 The on-axis chromatic aberration curve of the optical camera lens of Embodiment 4 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical camera lens. Figure 15 The astigmatism curve of the optical camera lens of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 16 The distortion curve of the optical camera lens of Embodiment 4 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0137] according to Figures 14 to 16 It can be seen that the optical camera lens given in Example 4 can achieve good imaging quality.

[0138] Example 5

[0139] like Figures 17 to 20 As shown, an optical camera lens according to Embodiment 5 of this application is described. Figure 17 A schematic diagram of the optical camera lens of Embodiment 5 is shown. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0140] like Figure 17 As shown, the optical camera lens includes, from the object side to the image side, the following elements in sequence: first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, and imaging plane IMG.

[0141] The first lens E1 has negative optical power, its object-side surface S1 is concave, and its image-side surface S2 is convex. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The sixth lens E6 has positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is convex. The seventh lens E7 has positive optical power, its object-side surface S13 is convex, and its image-side surface S14 is convex. The eighth lens E8 has negative optical power. The object-side surface S15 of the eighth lens is convex, and the image-side surface S16 of the eighth lens is concave. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging plane IMG.

[0142] Table 9 shows the basic structural parameters of the optical camera lens in Embodiment 5, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0143]

[0144]

[0145] Table 9

[0146] Table 10 gives the higher-order coefficients that can be used for each aspherical lens S1-S16 in Example 5. The surface shape of each aspherical lens can be defined by, but is not limited to, the formula (1) in Example 1.

[0147]

[0148]

[0149] Table 10

[0150] Figure 18 The on-axis chromatic aberration curve of the optical camera lens of Embodiment 5 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical camera lens. Figure 19 The astigmatism curve of the optical camera lens of Embodiment 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 20 The distortion curve of the optical camera lens of Embodiment 5 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0151] according to Figures 18 to 20 It can be seen that the optical camera lens given in Example 5 can achieve good imaging quality.

[0152] Example 6

[0153] like Figures 21 to 24 As shown, an optical camera lens according to Embodiment Six of this application is described. Figure 21 A schematic diagram of the optical camera lens of Embodiment Six is ​​shown. For the sake of brevity, descriptions similar to those in Embodiment One are omitted.

[0154] like Figure 21 As shown, the optical camera lens includes, from the object side to the image side, the following elements in sequence: first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, and imaging plane IMG.

[0155] The first lens E1 has negative optical power, with its object-side surface S1 and image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 and image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens E8 has negative optical power. The object-side surface S15 of the eighth lens is concave, and the image-side surface S16 of the eighth lens is concave. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging plane IMG.

[0156] Table 11 shows the basic structural parameters of the optical camera lens of Embodiment Six, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0157]

[0158]

[0159] Table 11

[0160] Table 12 gives the higher-order coefficients that can be used for each aspherical lens S1-S16 in Example 6. The surface shape of each aspherical lens can be defined by, but is not limited to, the formula (1) in Example 1.

[0161]

[0162]

[0163] Table 12

[0164] Figure 22 The on-axis chromatic aberration curve of the optical camera lens of Embodiment Six is ​​shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical camera lens. Figure 23 The astigmatism curve of the optical camera lens of Embodiment Six is ​​shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 24 The distortion curve of the optical camera lens of Embodiment Six is ​​shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0165] according to Figures 22 to 24It can be seen that the optical camera lens given in Example 6 can achieve good imaging quality.

[0166] Example 7

[0167] like Figures 25 to 28 As shown, an optical camera lens according to Embodiment Seven of this application is described. Figure 25 A schematic diagram of the optical camera lens of Embodiment Seven is shown. For the sake of brevity, descriptions similar to those in Embodiment One are omitted.

[0168] like Figure 25 As shown, the optical camera lens includes, from the object side to the image side, the following elements in sequence: first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, and imaging plane IMG.

[0169] The first lens E1 has negative optical power, with its object-side surface S1 and image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 and image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 and image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 and image-side surface S14 being convex. The eighth lens E8 has negative optical power. The object-side surface S15 of the eighth lens is concave, and the image-side surface S16 of the eighth lens is concave. Light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging plane IMG.

[0170] Table 13 shows the basic structural parameters of the optical camera lens of Embodiment 7, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0171]

[0172]

[0173] Table 13

[0174] Table 14 gives the higher-order coefficients that can be used for each aspherical lens S1-S16 in Example 7. The surface shape of each aspherical lens can be defined by, but is not limited to, the formula (1) in Example 1.

[0175]

[0176]

[0177] Table 14

[0178] Figure 26 The on-axis chromatic aberration curve of the optical camera lens of Embodiment 7 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical camera lens. Figure 27 The astigmatism curve of the optical camera lens of Embodiment 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 28 The distortion curve of the optical camera lens of Embodiment 7 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0179] according to Figures 26 to 28 It can be seen that the optical camera lens given in Example 7 can achieve good imaging quality.

[0180] In summary, Examples 1 to 7 satisfy the relationships shown in Table 15.

[0181] Conditional / Example 1 2 3 4 5 6 7 |f7 / f8| 1.61 1.71 1.55 1.44 1.54 1.69 1.71 (|R1|+|R2|) / |f1| 3.00 3.78 3.37 0.29 3.09 7.33 3.54 |f3|*|f4| / (CT3*CT4) 66.02 64.10 63.77 660.76 67.06 69.84 59.19 (CT2+CT1) / (CT2-CT1) 2.78 2.80 2.84 8.56 3.25 3.14 3.18 (|f5|+|f6|) / (|R11|+|R12|) 2.54 1.46 41.70 5.81 0.46 1.66 6.41 ImgH / EPD 1.04 0.90 1.04 1.05 1.04 1.04 1.04 TD / ImgH 1.74 2.01 1.74 1.74 1.74 1.73 1.74 (|f7|+|f8|) / (|f7|-|f8|) 4.29 3.82 4.61 5.54 4.68 3.91 3.81 (V2+V5) / V1 2.02 2.03 1.97 4.83 2.07 2.03 1.93 (V5+V8) / V4 0.67 0.68 0.69 4.54 0.68 0.71 0.66 (|R3+R4|) / CT3 10.30 10.06 10.07 49.58 10.64 11.17 9.97 (|f4|+|f5|) / |CT4-CT5| 29.03 28.81 28.08 10.14 24.86 24.81 28.17 TTL / (T67+CT7) 8.21 8.30 8.19 4.37 7.97 7.97 8.71 (|R15|+|R16|) / (T78+CT8) 68.41 56.41 59.38 9.56 54.69 40.22 50.16

[0182] Table 15

[0183] Table 16 shows the effective focal lengths f1 to f8 of each lens in the optical camera lenses of Examples 1 to 7.

[0184]

[0185]

[0186] Table 16

[0187] This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical camera lens described above.

[0188] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0189] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0190] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0191] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical camera lens, characterized in that, The optical camera lens has only eight lenses with optical power, and the eight lenses with optical power from the object side to the image side include, in sequence: A first lens, having negative optical power, wherein the object side of the first lens is concave; A second lens, the second lens having negative optical power; The third lens has positive optical power and its object side is convex. A fourth lens, wherein the fourth lens has positive optical power; The fifth lens has a negative optical power; A sixth lens, wherein the sixth lens has optical power; The seventh lens has positive optical power and its image-side surface is convex. The eighth lens has negative optical power and its image-side surface is concave. in, The effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy the following condition: 1.54 ≤ |f7 / f8| ≤ 1.71; the radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, and the effective focal length f1 of the first lens satisfy the following condition: 3.00 ≤ (|R1| + |R2|) / |f1| ≤ 7.

33.

2. The optical camera lens according to claim 1, characterized in that, The effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the center thickness CT3 of the third lens on the optical axis of the optical camera lens, and the center thickness CT4 of the fourth lens on the optical axis satisfy the following condition: 59.19≤|f3|*|f4| / (CT3*CT4)≤69.

84.

3. The optical camera lens according to claim 1, characterized in that, The center thickness CT2 of the second lens on the optical axis of the optical camera lens and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 2.78≤(CT2+CT1) / (CT2-CT1)≤3.

25.

4. The optical camera lens according to claim 1, characterized in that, The effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the radius of curvature R11 of the object side of the sixth lens, and the radius of curvature R12 of the image side of the sixth lens satisfy the following condition: 0.46≤(|f5|+|f6|) / (|R11|+|R12|)≤41.

70.

5. The optical camera lens according to claim 1, characterized in that, The diagonal length of half the effective pixel area on the imaging surface of the optical camera lens, ImgH, and the entrance pupil diameter, EPD, of the optical camera lens satisfy the following condition: 0.90≤ImgH / EPD≤1.

04.

6. The optical camera lens according to claim 1, characterized in that, The distance TD between the object-side surface of the first lens and the image-side surface of the eighth lens on the optical axis of the optical camera lens, and half the diagonal length ImgH of the effective pixel area on the imaging surface of the optical camera lens, satisfy the following condition: 1.73≤TD / ImgH≤2.

01.

7. The optical camera lens according to claim 1, characterized in that, The material of the fifth lens or the sixth lens is glass.

8. The optical camera lens according to claim 1, characterized in that, The effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy the following condition: 3.81≤(|f7|+|f8|) / (|f7|-|f8|)≤4.

68.

9. The optical camera lens according to claim 1, characterized in that, The dispersion coefficient V2 of the second lens, the dispersion coefficient V5 of the fifth lens, and the dispersion coefficient V1 of the first lens satisfy the following condition: 1.93≤(V2+V5) / V1≤2.

07.

10. The optical camera lens according to any one of claims 1 to 9, characterized in that, The dispersion coefficients V5, V4, and V8 of the fifth lens satisfy the following condition: 0.66 ≤ (V5 + V8) / V4 ≤ 0.

71.

11. The optical camera lens according to any one of claims 1 to 9, characterized in that, The radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens, and the center thickness CT3 of the third lens on the optical axis of the optical camera lens satisfy the following: 9.97≤(|R3+R4|) / CT3≤11.

17.

12. The optical camera lens according to any one of claims 1 to 9, characterized in that, The effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the center thickness CT4 of the fourth lens on the optical axis of the optical camera lens, and the center thickness CT5 of the fifth lens on the optical axis satisfy the following condition: 24.81 ≤ (|f4|+|f5|) / |CT4-CT5|≤29.

03.

13. The optical camera lens according to any one of claims 1 to 9, characterized in that, The following satisfy the following conditions: 7.97≤TTL / (T67+CT7)≤8.71: the axial distance TTL between the object side of the first lens and the imaging surface of the optical camera lens, the distance T67 between the image side of the sixth lens and the object side of the seventh lens along the optical axis of the optical camera lens, and the center thickness CT7 of the seventh lens on the optical axis.

14. The optical camera lens according to any one of claims 1 to 9, characterized in that, The radius of curvature R15 of the object side of the eighth lens, the radius of curvature R16 of the image side of the eighth lens, the distance T78 from the image side of the seventh lens to the object side of the eighth lens along the optical axis of the optical camera lens, and the center thickness CT8 of the eighth lens on the optical axis satisfy the following: 40.22≤(|R15|+|R16|) / (T78+CT8)≤68.41.

Images