Lens group for optical imaging lens

Abstract

The present application provides a lens set for optical imaging lens, wherein the lens set comprises 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 arranged in order from object side to image side along the optical axis, wherein the first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, the fifth lens has negative refractive power, the sixth lens has positive refractive power, the seventh lens has positive refractive power, the eighth lens has negative refractive power, and the object side surface of the eighth lens is concave and the image side surface is convex.

Description

Technical Field

[0001] This invention relates to optical elements, and more particularly to a lens assembly for an optical imaging lens. Background Technology

[0002] Today, people's lives have entered a rapidly developing digital age. As a witness to this era, mobile phone camera module technology has become increasingly mature. Its photo effects in terms of color, exposure, background blur and other aspects are comparable to those of SLR cameras. In terms of image quality, in recent years, various solutions have been adopted to improve the contrast of the picture - such as large aperture design to improve the diffraction limit, and higher pixel chip design to better restore the details of the picture.

[0003] However, limited by the single-pixel size of the chip, high-pixel chips mean a larger chip sensor size is required, and the limited thickness of the mobile phone module to allow for a larger image sensor becomes the core bottleneck. All of this places higher demands on the design of mobile phone lenses: high-end lens designs with larger image sensors and higher resolution, and shorter lens ratios (Ratio = TTL / Image Height). Today's mobile phone lenses are showing a continuous trend of improvement, requiring more lens elements to be involved in the design, leading to the emergence of 6P, 7P, and even 8P lenses. Therefore, developing an optical lens that simultaneously achieves miniaturization and high image quality has become a major challenge. Summary of the Invention

[0004] A key advantage of this invention is that it provides a lens group for an optical imaging lens, wherein the lens group comprises eight lenses and the lens group can effectively control the aperture size of the optical system, which is beneficial to increasing the amount of light entering the lens and thus improving the image quality.

[0005] Another advantage of the present invention is that it provides a lens group for an optical imaging lens, wherein the lens group enables the object-side end of the optical system to have sufficient converging capability to adjust the beam focusing position, thereby shortening the overall length of the system.

[0006] Another advantage of the present invention is that it provides a lens group for an optical imaging lens, wherein the lens group helps to adjust the refractive power of the lens group near the image side to balance the refractive power configuration of the lens group and improve image quality and image brightness.

[0007] Another advantage of the present invention is that it provides a lens group for an optical imaging lens, wherein the lens group has a compact structure, which is beneficial to reducing the overall length of the optical system.

[0008] Another advantage of the present invention is that it provides a lens group for an optical imaging lens, wherein the lens group helps to compress the overall length of the optical system and control the volume of the lens group.

[0009] Another advantage of the present invention is that it provides a lens group for an optical imaging lens, wherein the lens group meets the requirements of a larger aperture while reducing the overall length of the lens group of the optical system.

[0010] Another advantage of the present invention is that it provides a lens group for an optical imaging lens, wherein the lens group ensures that the optical system lens group has a short overall length and a large imaging area.

[0011] Another advantage of the present invention is that it provides a lens group for an optical imaging lens, wherein the lens group can help to expand the field of view of the optical system.

[0012] Another advantage of the present invention is that it provides a lens group for an optical imaging lens, wherein the lens group helps to reduce the volume of the optical system lens group and expand the field of view.

[0013] Another advantage of the present invention is that it provides a lens group for an optical imaging lens, wherein the lens group helps to balance the back focal length and aperture size of the lens group in the optical system, so that the optical system can shorten the back focal length while maintaining image brightness.

[0014] Another advantage of the present invention is that it provides a lens group for an optical imaging lens, wherein the lens group balances the total length of the system with the incident angle of light incident on the imaging plane.

[0015] According to one aspect of the present invention, a lens assembly for an optical imaging lens of the present invention, capable of achieving the aforementioned and other objects and advantages, comprises:

[0016] A first lens, wherein the first lens has positive optical power;

[0017] A second lens, wherein the second lens has negative optical power;

[0018] A third lens, wherein the third lens has positive optical power;

[0019] A fourth lens, wherein the fourth lens has positive optical power;

[0020] A fifth lens, wherein the fifth lens has negative optical power;

[0021] A sixth lens, wherein the sixth lens has positive optical power;

[0022] A seventh lens, wherein the seventh lens has positive optical power; and

[0023] An eighth lens, wherein the eighth lens has negative optical power, wherein the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and the eighth lens are arranged sequentially from the object side to the image side along the optical axis.

[0024] According to one embodiment of the present invention, the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TTL, and satisfies the following condition: 9.4 <TTL<10.5。

[0025] According to one embodiment of the present invention, the maximum imaging height is ImgH, which can satisfy the following condition: TTL / ImgH<1.3.

[0026] According to one embodiment of the present invention, the optical system of the lens group has a focal length of f, an entrance pupil diameter of EPD, and satisfies the following condition: 1.8 <f / EPD<2.05。

[0027] According to one embodiment of the present invention, the optical system of the lens group has a focal length of f, the focal length of the first lens is f1, and the following condition is satisfied: 0.9 <f / f1<0.94。

[0028] According to one embodiment of the present invention, the focal length of the optical system of the lens group is f, the focal length of the eighth lens is f8, and the following condition is satisfied: 1.2 < |f / f8| < 1.4.

[0029] According to an embodiment of the present invention, the focal length of the optical system of the lens group is f, the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the eighth lens is Td, and the following conditions are satisfied: 1 <Td / f<1.1。

[0030] According to one embodiment of the present invention, the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TTL, the entrance pupil diameter of the optical system is EPD, and the following condition is satisfied: 2.1 <TTL / EPD<2.4。

[0031] According to one embodiment of the present invention, the optical system of the lens group has a focal length of f, a maximum imaging height of ImgH, and satisfies the following condition: 0.9 <ImgH / f<1。

[0032] According to one embodiment of the present invention, the distance from the image-side surface of the eighth lens of the lens group to the imaging plane on the optical axis is BL, the entrance pupil diameter of the optical system is EPD, and the following condition is satisfied: 0.2 <BL / EPD<0.3。

[0033] According to one embodiment of the present invention, the maximum effective radius of the object-side surface of the first lens of the lens group is Y11, the maximum effective radius of the image-side surface of the eighth lens is Y82, and the following condition is satisfied: 0.3 <Y11 / Y82<0.35。

[0034] According to another aspect of the present invention, the present invention further provides an optical imaging lens, comprising:

[0035] One aperture; and

[0036] A lens group, wherein the aperture is located on the incident light side of the lens group, the lens group comprising:

[0037] A first lens, wherein the first lens has positive optical power;

[0038] A second lens, wherein the second lens has negative optical power;

[0039] A third lens, wherein the third lens has positive optical power;

[0040] A fourth lens, wherein the fourth lens has positive optical power;

[0041] A fifth lens, wherein the fifth lens has negative optical power;

[0042] A sixth lens, wherein the sixth lens has positive optical power;

[0043] A seventh lens, wherein the seventh lens has positive optical power; and

[0044] An eighth lens, wherein the eighth lens has negative optical power, wherein the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and the eighth lens are arranged sequentially from the object side to the image side along the optical axis.

[0045] The further objects and advantages of the invention will become fully apparent from the following description and accompanying drawings.

[0046] These and other objects, features and advantages of the present invention will become fully apparent from the following detailed description and accompanying drawings. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the lens group of an optical imaging lens according to a first preferred embodiment of the present invention.

[0048] Figure 2 This is a distortion diagram of the lens group according to the first preferred embodiment of the invention described above.

[0049] Figure 3This is a schematic diagram of the chromatic aberration of the lens group according to the first preferred embodiment of the present invention.

[0050] Figure 4 This is a schematic diagram of the astigmatism curve of the lens group according to the first preferred embodiment of the present invention.

[0051] Figure 5 This is a schematic diagram of the lens group of an optical imaging lens according to a second preferred embodiment of the present invention.

[0052] Figure 6 This is a distortion diagram of the lens group according to the second preferred embodiment of the invention described above.

[0053] Figure 7 This is a schematic diagram of the chromatic aberration of the lens group according to the second preferred embodiment of the present invention.

[0054] Figure 8 This is a schematic diagram of the astigmatism curve of the lens group according to the second preferred embodiment of the present invention.

[0055] Figure 9 This is a schematic diagram of the lens group of an optical imaging lens according to a third preferred embodiment of the present invention.

[0056] Figure 10 This is a distortion diagram of the lens group according to the third preferred embodiment of the invention described above.

[0057] Figure 11 This is a schematic diagram of the chromatic aberration of the lens group according to the third preferred embodiment of the present invention.

[0058] Figure 12 This is a schematic diagram of the astigmatism curve of the lens group according to the third preferred embodiment of the present invention.

[0059] Figure 13 This is a schematic diagram of the lens group of an optical imaging lens according to a fourth preferred embodiment of the present invention.

[0060] Figure 14 This is a distortion diagram of the lens group according to the fourth preferred embodiment of the invention described above.

[0061] Figure 15 This is a schematic diagram of the chromatic aberration of the lens group according to the fourth preferred embodiment of the present invention.

[0062] Figure 16 This is a schematic diagram of the astigmatism curve of the lens group according to the fourth preferred embodiment of the present invention.

[0063] Figure 17 This is a schematic diagram of the lens group of an optical imaging lens according to a fifth preferred embodiment of the present invention.

[0064] Figure 18 This is a distortion diagram of the lens group according to the fifth preferred embodiment of the invention described above.

[0065] Figure 19 This is a schematic diagram of the chromatic aberration of the lens group according to the fifth preferred embodiment of the present invention.

[0066] Figure 20 This is a schematic diagram of the astigmatism curve of the lens group according to the fifth preferred embodiment of the present invention.

[0067] Figure 21 This is a schematic diagram of the lens group of an optical imaging lens according to a fourth preferred embodiment of the present invention.

[0068] Figure 22 This is a distortion diagram of the lens group according to the fourth preferred embodiment of the invention described above.

[0069] Figure 23 This is a schematic diagram of the chromatic aberration of the lens group according to the fourth preferred embodiment of the present invention.

[0070] Figure 24 This is a schematic diagram of the astigmatism curve of the lens group according to the fourth preferred embodiment of the present invention. Detailed Implementation

[0071] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0072] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0073] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0074] Referring to the accompanying drawings of this invention Figures 1 to 24 As shown, a lens group for an optical imaging lens according to the present invention will be described in the following description. In the present invention, the lens group includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, a seventh lens 70, and an eighth lens 80, wherein the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, the seventh lens 70, and the eighth lens are arranged sequentially along the same optical axis.

[0075] Let the focal length of the optical system of the lens group be f; the entrance pupil diameter of the optical system be EPD; the aperture value be Fno; the half field of view be HFOV; the focal length of the first lens 10 be f1; the focal length of the eighth lens 80 be f8; the distance on the optical axis from the object-side surface S11 of the first lens 10 to the image-side surface S82 of the eighth lens 80 be Td; the distance on the optical axis from the image-side surface S82 of the eighth lens 80 to the imaging plane S0 be BL; the total length of the optical system of the lens group be TTL; the half-image plane height of the lens group be ImgH; the maximum effective radius Y11 of the object-side surface S11 of the first lens 10; the maximum effective radius Y82 of the image-side surface S82 of the eighth lens 80; and the distance on the optical axis from the aperture 100 to the image-side surface S2 of the eighth lens 80 be Sd.

[0076] The structures of the aperture and each lens of the lens group for the optical imaging lens satisfy the following conditional expressions: 7.9 < f < 9; 1.8 < Fno < 2.05; 41° < HFOV < 46°. The lens group satisfies the following condition: 1.8 < f / EPD < 2.05, so that the lens group can effectively control the aperture size of the optical system, which is beneficial to increasing the light input amount and then improving the imaging quality. In the present invention, the lens group of the optical imaging lens satisfies the following conditional expression, where 0.9 < f / f1 < 0.94, so as to enable the object side end of the optical system to have sufficient converging ability to adjust the beam focusing position and then shorten the overall length of the system. In the present invention, the lens group of the optical imaging lens satisfies the following conditional expression, where 1.2 < |f / f8| < 1.4, which helps to adjust the refractive power of the lens group close to the image side to balance the refractive power configuration of the lens group and improve the imaging quality and imaging brightness. In the present invention, the lens group of the optical imaging lens satisfies the following conditional expression, where 1 < Td / f < 1.1, so that the system can have a more compact structure to shorten the overall length of the optical system. In the present invention, the lens group of the optical imaging lens satisfies the following conditional expression, where 9.4 < TTL < 10.5, which helps to compress the overall length of the optical system and control the volume of the lens group. In the present invention, the lens group of the optical imaging lens satisfies the following conditional expression, where 2.1 < TTL / EPD < 2.4, so as to meet the requirement of a larger aperture while shortening the overall length of the lens group of the optical system. In the present invention, the lens group of the optical imaging lens satisfies the following conditional expression, where TTL / ImgH < 1.3, so as to ensure that the lens group of the optical system has a short overall length and a large imaging area. In the present invention, the lens group of the optical imaging lens satisfies the following conditional expression, where 0.9 < ImgH / f < 1, which helps to expand the viewing angle of the optical system. In the present invention, the lens group of the optical imaging lens satisfies the following conditional expression, where 0.2 < BL / EPD < 0.3, which helps to balance the back focal length and the aperture size of the lens group in the optical system, so that the optical system can take into account the imaging brightness while shortening the back focal length. In the present invention, the lens group of the optical imaging lens satisfies the following conditional expression, where 0.3 < Y11 / Y82 < 0.35, which helps to compress the volume of the lens group of the optical system and expand the viewing angle. In the present invention, the lens group of the optical imaging lens satisfies the following conditional expression, where 0.85 < Sd / Td < 0.95, so as to balance the overall length of the system and the incident angle of light on the imaging surface. It is worth mentioning that in the present invention, when the overall length of the optical system is short, the image surface of the optical imaging lens is large enough, and the range of the semi-image height Imgh corresponding to the optical imaging lens is 7.3 < Imgh < 8.2.

[0077] In the accompanying drawings of the specification of the present invention Figures 1 to 4Tables 1 and 2 show a lens group for an optical imaging lens according to a first preferred embodiment of the present invention. Figure 1 As shown, the first lens 10 has positive optical power, and the object-side surface S11 of the first lens 10 facing the object side is convex, while the image-side surface S12 of the first lens 10 facing the image side is concave; the second lens 20 has negative optical power, and the object-side surface S21 of the second lens 20 facing the object side is convex, while the image-side surface S22 of the second lens 20 facing the image side is concave; the third lens 30 has positive optical power, and the object-side surface S31 of the third lens 30 facing the paraxial side of the object side is convex, while the image-side surface S32 of the third lens 30 facing the image side is concave; the fourth lens 40 has positive optical power, and the object-side surface S41 of the fourth lens 40 facing the object side is concave, while the image-side surface S42 of the fourth lens 40 facing the image side is concave. The fifth lens 50 has negative optical power, and the object-side surface S51 of the fifth lens 50 facing the object side is convex, while the image-side surface S52 of the fifth lens 50 facing the image side is concave; the sixth lens 60 has positive optical power, and the object-side surface S61 of the sixth lens 60 facing the object side is concave, while the image-side surface S62 of the sixth lens 60 facing the image side is convex; the seventh lens 70 has positive optical power, and the object-side surface S71 of the seventh lens 70 facing the object side is convex, while the image-side surface S72 of the seventh lens 70 facing the image side is concave; the eighth lens 80 has negative optical power, and the object-side surface S81 of the eighth lens 80 facing the object side is concave, while the image-side surface S82 of the eighth lens 80 facing the image side is convex.

[0078] The optical imaging lens further includes an aperture 100 and at least one filter 200, wherein the aperture 100 is located at the front end of the light-incident side of the first lens 10, and the at least one filter 200 is located at the rear end of the light-outcident side of the eighth lens 80. Light enters the lens group of the optical imaging lens through the aperture 100, and is then guided by the lens group to the filter 200, where it forms an image with an imaging surface S0. Correspondingly, a photosensitive chip is located on the imaging surface S0 of the optical imaging lens. The filter has a light-incident side surface S201 and a light-outcident side surface 202.

[0079] Table 1 shows the surface type, radius of curvature, thickness / distance, material, focal length, normalized radius, and conic coefficient of each lens in a specific example of a first preferred embodiment of the present invention.

[0080] Table 1

[0081]

[0082]

[0083] The surface shape structure relationship of each lens in the lens group of the optical imaging lens of the present invention is shown in the following formula:

[0084] Table 2 shows parameters of an optional embodiment of the surface profile structure of each surface of each lens in the first preferred embodiment of the present invention.

[0085] Table 2

[0086]

[0087] As an example, in this preferred embodiment of the invention, the optical system of the lens group has a focal length f of 8.14, an aperture value Fno of 1.95, and a half field of view (HFOV) of 44.23. In this preferred embodiment of the invention, f / f1 is 0.92, |f / f8| is 1.32, Td / f is 1.03, TTL is 9.50, ImgH is 8.14, TTL / EPD is 2.27, TTL / ImgH is 1.16, ImgH / f is 1.00, BL / EPD is 0.27, Y11 / Y82 is 0.31, and Sd / Td is 0.90.

[0088] Figures 2 to 4 This is an optical performance graph of a specific example of the lens group according to the first preferred embodiment of the present invention, wherein... Figure 2 The diagram shown is a distortion curve of a specific embodiment of the lens group according to the first preferred embodiment of the present invention; Figure 3 It adopts the on-axis chromatic aberration curve of this specific embodiment of the lens group according to the first preferred embodiment of the present invention; Figure 4 This refers to the astigmatism curve of a specific embodiment of the lens group according to the first preferred embodiment of the present invention. Figures 2 to 4 It is understood that the optical imaging lens of this specific example employing the lens group according to the first preferred embodiment of the present invention has better optical performance.

[0089] Referring to the accompanying drawings of this invention Figures 5 to 8 As shown, a lens group for an optical imaging lens according to a second preferred embodiment of the present invention is described below. The lens group includes a first lens 10A, a second lens 20A, a third lens 30A, a fourth lens 40A, a fifth lens 50A, a sixth lens 60A, a seventh lens 70A, and an eighth lens 80A, wherein the first lens 10A, the second lens 20A, the third lens 30A, the fourth lens 40A, the fifth lens 50A, the sixth lens 60A, the seventh lens 70A, and the eighth lens are arranged sequentially along the same optical axis.

[0090] Similar to the first preferred embodiment described above, the first lens 10A has positive optical power, and the object-side surface S11A of the first lens 10A facing the object side is convex, while the image-side surface S12A of the first lens 10A facing the image side is concave; the second lens 20A has negative optical power, and the object-side surface S21A of the second lens 20A facing the object side is convex, while the image-side surface S22A of the second lens 20A facing the image side is concave; the third lens 30A has positive optical power, and the object-side surface S31A of the third lens 30A facing the object side paraxially is convex, while the image-side surface S32A of the third lens 30A facing the image side is concave; the fourth lens 40A has positive optical power, and the object-side surface S41A of the fourth lens 40A facing the object side is concave, while the image-side surface S12A of the fourth lens 40A facing the image side is concave. The fifth lens 50A has negative optical power, and its object-side surface S51A facing the object side is convex, while its image-side surface S52A facing the image side is concave. The sixth lens 60A has positive optical power, and its object-side surface S61A facing the object side is concave, while its image-side surface S62A facing the image side is convex. The seventh lens 70A has positive optical power, and its object-side surface S71A facing the object side is convex, while its image-side surface S72A facing the image side is concave. The eighth lens 80A has negative optical power, and its object-side surface S81A facing the object side is concave, while its image-side surface S82A facing the image side is convex.

[0091] Table 3 shows the surface type, radius of curvature, thickness / distance, material, focal length, normalized radius, and conic coefficient of each lens in a specific example of a second preferred embodiment of the present invention.

[0092] Table 3

[0093]

[0094]

[0095] Table 4 shows parameters of an optional embodiment of the surface profile structure of each lens in the second preferred embodiment of the present invention.

[0096] Table 4

[0097]

[0098] As an example, in this preferred embodiment of the invention, the optical system of the lens group has a focal length f of 8.2, an aperture value Fno of 1.95, and a half field of view (HFOV) of 44.23. In this preferred embodiment of the invention, f / f1 is 0.92, |f / f8| is 1.38, Td / f is 1.02, TTL is 9.50, ImgH is 8.17116, TTL / EPD is 2.26, TTL / ImgH is 1.16, ImgH / f is 1.00, BL / EPD is 0.27, Y11 / Y82 is 0.32, and Sd / Td is 0.90.

[0099] Figures 6 to 8 This is an optical performance graph of a specific example of the lens group according to the second preferred embodiment of the present invention, wherein... Figure 6 The diagram shown is a distortion curve of a specific embodiment of the lens group according to the second preferred embodiment of the present invention; Figure 7 It adopts the on-axis chromatic aberration curve of the lens group according to the second preferred embodiment of the present invention; Figure 8 This refers to the astigmatism curve of a specific embodiment of the lens group according to the second preferred embodiment of the present invention. Figures 6 to 8 It is understood that the optical imaging lens of this specific example employing the lens group according to the second preferred embodiment of the present invention has better optical performance.

[0100] Referring to the accompanying drawings of this invention Figures 9 to 12 As shown, a lens group for an optical imaging lens according to a third preferred embodiment of the present invention is described below. The lens group includes a first lens 10B, a second lens 20B, a third lens 30B, a fourth lens 40B, a fifth lens 50B, a sixth lens 60B, a seventh lens 70B, and an eighth lens 80B, wherein the first lens 10B, the second lens 20B, the third lens 30B, the fourth lens 40B, the fifth lens 50B, the sixth lens 60B, the seventh lens 70B, and the eighth lens are arranged sequentially along the same optical axis.

[0101] It is worth mentioning that the surface structure of each lens in the lens group of the preferred embodiment of the present invention is the same as that in the above preferred embodiment, and will not be described again here. The difference lies in the specific parameters of each lens.

[0102] Table 5 shows the surface type, radius of curvature, thickness / distance, material, focal length, normalized radius, and conic coefficient of each lens in a specific example of a third preferred embodiment of the present invention.

[0103] Table 5

[0104]

[0105]

[0106] Table 6 shows parameters of an optional embodiment of the surface profile structure of each lens in the third preferred embodiment of the present invention.

[0107] Table 6

[0108]

[0109]

[0110] As an example, in this preferred embodiment of the invention, the optical system of the lens group has a focal length f of 8.195, an aperture value Fno of 2.05, and a half field of view (HFOV) of 44.23. In this preferred embodiment of the invention, f / f1 is 0.93, |f / f8| is 1.27, Td / f is 1.02, TTL is 9.50, ImgH is 8.195, TTL / EPD is 2.38, TTL / ImgH is 1.16, ImgH / f is 1.00, BL / EPD is 0.29, Y11 / Y82 is 0.30, and Sd / Td is 0.91.

[0111] Figures 10 to 12 This is an optical performance graph of a specific example of the lens group according to the third preferred embodiment of the present invention, wherein... Figure 10 The figure shown is a distortion curve diagram of a specific embodiment of the lens group according to the third preferred embodiment of the present invention; Figure 11 It adopts the on-axis chromatic aberration curve of the lens group according to the third preferred embodiment of the present invention; Figure 12 This refers to the astigmatism curve of a specific embodiment of the lens group according to the third preferred embodiment of the present invention. Figures 10 to 12 It is understood that the optical imaging lens of this specific example employing the lens group according to the third preferred embodiment of the present invention has better optical performance.

[0112] Referring to the accompanying drawings of this invention Figures 13 to 16 As shown, a lens group for an optical imaging lens according to a fourth preferred embodiment of the present invention is described below. The lens group includes a first lens 10C, a second lens 20C, a third lens 30C, a fourth lens 40C, a fifth lens 50C, a sixth lens 60C, a seventh lens 70C, and an eighth lens 80C, wherein the first lens 10C, the second lens 20C, the third lens 30C, the fourth lens 40C, the fifth lens 50C, the sixth lens 60C, the seventh lens 70C, and the eighth lens are arranged sequentially along the same optical axis.

[0113] It is worth mentioning that the surface structure of each lens in the lens group of the preferred embodiment of the present invention is the same as that in the above preferred embodiment, and will not be described again here. The difference lies in the specific parameters of each lens.

[0114] Table 7 shows the surface type, radius of curvature, thickness / distance, material, focal length, normalized radius, and conic coefficient of each lens in a specific example of a fourth preferred embodiment of the present invention.

[0115] Table 7

[0116]

[0117]

[0118] Table 8 shows parameters of an optional embodiment of the surface profile structure of each lens in the fourth preferred embodiment of the present invention.

[0119] Table 8

[0120]

[0121]

[0122] As an example, in this preferred embodiment of the invention, the optical system of the lens group has a focal length f of 8.95, an aperture value Fno of 1.95, and a half field of view (HFOV) of 41.55. In this preferred embodiment of the invention, f / f1 is 0.92, |f / f8| is 1.32, Td / f is 1.03, TTL is 10.47, ImgH is 8.1445, TTL / EPD is 2.28, TTL / ImgH is 1.28, ImgH / f is 0.91, BL / EPD is 0.27, Y11 / Y82 is 0.30, and Sd / Td is 0.90.

[0123] Figures 14 to 16 This is an optical performance graph of a specific example of the lens group according to the fourth preferred embodiment of the present invention, wherein... Figure 15 The figure shown is a distortion curve diagram of a specific embodiment of the lens group according to the fourth preferred embodiment of the present invention; Figure 16 It adopts the on-axis chromatic aberration curve of the lens group according to the fourth preferred embodiment of the present invention; Figure 17 This refers to the astigmatism curve of a specific embodiment of the lens group according to the fourth preferred embodiment of the present invention. Figures 14 to 16 It is understood that the optical imaging lens of this specific example employing the lens group according to the fourth preferred embodiment of the present invention has better optical performance.

[0124] Referring to the accompanying drawings of this invention Figures 17 to 20 As shown, a lens group for an optical imaging lens according to a fifth preferred embodiment of the present invention is described below. The lens group includes a first lens 10D, a second lens 20D, a third lens 30D, a fourth lens 40D, a fifth lens 50D, a sixth lens 60D, a seventh lens 70D, and an eighth lens 80D, wherein the first lens 10D, the second lens 20D, the third lens 30D, the fourth lens 40D, the fifth lens 50D, the sixth lens 60D, the seventh lens 70D, and the eighth lens are arranged sequentially along the same optical axis.

[0125] It is worth mentioning that the surface structure of each lens in the lens group of the preferred embodiment of the present invention is the same as that in the above preferred embodiment, and will not be described again here. The difference lies in the specific parameters of each lens.

[0126] Table 9 shows the surface type, radius of curvature, thickness / distance, material, focal length, normalized radius, and conic coefficient of each lens in a specific example of a fifth preferred embodiment of the present invention.

[0127] Table 9

[0128]

[0129]

[0130] Table 10 shows parameters of an optional embodiment of the surface profile structure of each surface of each lens in the fifth preferred embodiment of the present invention.

[0131] Table 10

[0132]

[0133]

[0134] As an example, in this preferred embodiment of the invention, the optical system of the lens group has a focal length f of 7.97, an aperture value Fno of 1.95, and a half field of view (HFOV) of 45.13. In this preferred embodiment of the invention, f / f1 is 0.90, |f / f8| is 1.27, Td / f is 1.05, TTL is 9.45, ImgH is 7.3324, TTL / EPD is 2.28, TTL / ImgH is 1.28, ImgH / f is 0.91, BL / EPD is 0.27, Y11 / Y82 is 0.30, and Sd / Td is 0.90.

[0135] Figures 18 to 20 This is an optical performance graph of a specific example of the lens group according to the fifth preferred embodiment of the present invention, wherein... Figure 18 The diagram shown is a distortion curve of a specific embodiment of the lens group according to the fifth preferred embodiment of the present invention; Figure 19 It adopts the on-axis chromatic aberration curve of the lens group according to the fifth preferred embodiment of the present invention; Figure 20 This refers to the astigmatism curve of this specific embodiment of the lens group according to the fifth preferred embodiment of the present invention. Figures 18 to 20 It is understood that the optical imaging lens of this specific example employing the lens group according to the fifth preferred embodiment of the present invention has better optical performance.

[0136] Referring to the accompanying drawings of this invention Figures 21 to 24 As shown, a lens group for an optical imaging lens according to a sixth preferred embodiment of the present invention is described below. The lens group includes a first lens 10E, a second lens 20E, a third lens 30E, a fourth lens 40E, a fifth lens 50E, a sixth lens 60E, a seventh lens 70E, and an eighth lens 80E, wherein the first lens 10E, the second lens 20E, the third lens 30E, the fourth lens 40E, the fifth lens 50E, the sixth lens 60E, the seventh lens 70E, and the eighth lens are arranged sequentially along the same optical axis.

[0137] It is worth mentioning that the surface structure of each lens in the lens group of the preferred embodiment of the present invention is the same as that in the above preferred embodiment, and will not be described again here. The difference lies in the specific parameters of each lens.

[0138] Table 11 shows the surface type, radius of curvature, thickness / distance, material, focal length, normalized radius, and conic coefficient of each lens in a specific example of a sixth preferred embodiment of the present invention.

[0139] Table 11

[0140]

[0141]

[0142] Table 12 shows parameters of an optional embodiment of the surface profile structure of each surface of each lens in the sixth preferred embodiment of the present invention.

[0143] Table 12

[0144]

[0145]

[0146] As an example, in this preferred embodiment of the invention, the optical system of the lens group has a focal length f of 8.13, an aperture value Fno of 1.8, and a half field of view (HFOV) of 44.23. In this preferred embodiment of the invention, f / f1 is 0.92, |f / f8| is 1.40, Td / f is 1.06, TTL is 9.64, ImgH is 8.13, TTL / EPD is 2.13, TTL / ImgH is 1.18, ImgH / f is 1.00, BL / EPD is 0.23, Y11 / Y82 is 0.33, and Sd / Td is 0.88.

[0147] Figures 22 to 24 This is an optical performance graph of a specific example of the lens group according to the sixth preferred embodiment of the present invention, wherein... Figure 22 The figure shown is a distortion curve diagram of a specific embodiment of the lens group according to the sixth preferred embodiment of the present invention; Figure 23 It adopts the on-axis chromatic aberration curve of the lens group according to the sixth preferred embodiment of the present invention; Figure 24 This refers to the astigmatism curve of this specific embodiment of the lens group according to the sixth preferred embodiment of the present invention. Figures 22 to 24 It is understood that the optical imaging lens of this specific example employing the lens group according to the sixth preferred embodiment of the present invention has better optical performance.

[0148] It is worth noting that those skilled in the art will understand that the specific parameters in Tables 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 of this invention are merely illustrative of one specific implementation of the invention and are not intended to limit the invention.

[0149] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A lens group for an optical imaging lens, characterized in that, The lens set comprises: a first lens, wherein the first lens has positive refractive power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; a second lens, wherein the second lens has negative refractive power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave; a third lens, wherein the third lens has positive refractive power, the object side surface of the third lens is convex, and the image side surface of the third lens is concave; a fourth lens, wherein the fourth lens has positive refractive power, the object side surface of the fourth lens is concave, and the image side surface of the fourth lens is convex; a fifth lens, wherein the fifth lens has negative refractive power, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave; a sixth lens, wherein the sixth lens has positive refractive power, the object side surface of the sixth lens is concave, and the image side surface of the sixth lens is convex; a seventh lens, wherein the seventh lens has positive refractive power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave; and an eighth lens, wherein the eighth lens has negative refractive power, the object side surface of the eighth lens is concave, and the image side surface of the eighth lens is convex, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are arranged in order along the optical axis direction from the object side to the image side, wherein the distance between the object side surface of the first lens and the imaging surface on the optical axis is TTL, and the following condition is satisfied: 9.4 < TTL < 10.5; the focal lengths of the sixth lens, the second lens, and the fifth lens are f6, f2, and f5 respectively, the optical system focal length of the lens set is f, and the following conditions are satisfied: -0.12 < f / f6 < 0.057, and 0.46 < |f / f2 + f / f5| < 0.52; wherein the number of lenses with refractive power in the lens set is eight, which are the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens respectively.

2. The lens set according to claim 1, wherein the maximum imaging height is ImgH, and the following condition is satisfied: TTL / ImgH < 1.3; the range of ImgH formed by the lens set is 7.3 < ImgH < 8.

2.

3. The lens set according to claim 1 or 2, wherein the optical system focal length of the lens set is f, the optical system entrance pupil diameter is EPD, and the following condition is satisfied: 1.8 < f / EPD < 2.

05.

4. The lens set according to claim 1 or 2, wherein the optical system focal length of the lens set is f, the focal length of the first lens is f1, and the following condition is satisfied: 0.9 < f / f1 < 0.

94.

5. The lens set according to claim 1 or 2, wherein the optical system focal length of the lens set is f, the focal length of the eighth lens is f8, and the following condition is satisfied: 1.2 < |f / f8| < 1.

4.

6. The lens set according to claim 1 or 2, wherein an optical system focal length of the lens set is f, a distance on an optical axis from an object side surface of the first lens to an image side surface of the eighth lens in the optical system is Td, and the following condition is satisfied: 1 < Td / f < 1.

1.

7. The lens set according to claim 1 or 2, wherein a distance on an optical axis from the object side surface of the first lens to an imaging surface is TTL, an optical system entrance pupil diameter is EPD, and the following condition is satisfied: 2.1 < TTL / EPD < 2.

4.

8. The lens set according to claim 1 or 2, wherein an optical system focal length of the lens set is f, a maximum imaging height is ImgH, and the following condition is satisfied: 0.9 < ImgH / f < 1.

9. The lens set according to claim 1 or 2, wherein a distance on an optical axis from an image side surface of the eighth lens to an imaging surface of the lens set is BL, an optical system entrance pupil diameter is EPD, and the following condition is satisfied: 0.2 < BL / EPD < 0.

3.

10. The lens set according to claim 1 or 2, wherein a maximum effective radius of the object side surface of the first lens of the lens set is Yl l, a maximum effective radius of the image side surface of the eighth lens is Y82, and the following condition is satisfied: 0.3 < Yl l / Y82 < 0.

35.

11. An optical imaging lens characterized in that, including: an aperture; and a lens set, wherein the aperture is located on an entrance light side of the lens set, the lens set including: a first lens, wherein the first lens has positive refractive power, an object side surface of the first lens is convex, and an image side surface of the first lens is concave; a second lens, wherein the second lens has negative refractive power, an object side surface of the second lens is convex, and an image side surface of the second lens is concave; a third lens, wherein the third lens has positive refractive power, an object side surface of the third lens is convex, and an image side surface of the third lens is concave; a fourth lens, wherein the fourth lens has positive refractive power, an object side surface of the fourth lens is concave, and an image side surface of the fourth lens is convex; a fifth lens, wherein the fifth lens has negative refractive power, an object side surface of the fifth lens is convex, and an image side surface of the fifth lens is concave; a sixth lens, wherein the sixth lens has positive refractive power, an object side surface of the sixth lens is concave, and an image side surface of the sixth lens is convex; a seventh lens, wherein the seventh lens has positive refractive power, an object side surface of the seventh lens is convex, and an image side surface of the seventh lens is concave; and an eighth lens, wherein the eighth lens has negative refractive power, an object side surface of the eighth lens is concave, and an image side surface of the eighth lens is convex, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are arranged in order from an object side to an image side along an optical axis direction, wherein a distance on an optical axis from the object side surface of the first lens to an imaging surface is TTL, and the following condition is satisfied: 9.4 < TTL < 10.5; Focal lengths of the sixth lens, the second lens and the fifth lens are f6, f2 and f5 respectively, an optical system focal length of the lens group is f, and conditions of -0.12<f / f6<0.057 and 0.46<|f / f2+f / f5|<0.52 are met. Wherein, the number of lenses with optical power in the lens group is eight, which are the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens respectively.

Images