An ultra-short large target surface high-pixel motion DV optical imaging lens

Abstract

The application relates to the technical field of optical imaging modules, in particular to an ultra-short large-target high-pixel motion DV optical imaging lens, which comprises, in sequence from the object side to the image side along the optical axis direction, a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a filter and an image plane. The disclosed optical imaging lens adopts an optical structure design of 1G1GM6P, realizes miniaturization of the lens, successfully adapts to a 1 / 1.5-inch chip and reaches a high resolution of 50 million pixels; meanwhile, through introduction of a non-thermal design, thermal temperature drift is effectively compensated, so that the system can still keep stable imaging in a wide temperature range of-40 DEG C to 85 DEG C; in addition, through reasonable matching of a non-spherical plastic lens and a non-spherical glass lens, purple edges and other aberrations are optimized, and the imaging quality is significantly improved under the premise of ensuring compact volume.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, specifically to an ultra-short, large-surface, high-pixel motion DV optical imaging lens. Background Technology

[0002] With the rapid rise of outdoor sports, short video creation, and extreme photography, the market has placed higher demands on optical systems that can achieve both compact body designs and high resolution, large sensor compatibility. Traditional sports DV imaging lenses are often limited by the inherent contradiction between the overall optical length and the sensor size and pixel count, making it difficult to simultaneously improve large sensor size, high pixel resolution, and edge image quality while maintaining an ultra-short lens length and small volume. Overcoming this technical bottleneck is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] The purpose of this invention is to provide an ultra-short, large-aperture, high-pixel motion DV optical imaging lens. By optimizing the optical structure, rationally allocating the optical power, and using high-precision aspherical and special material lenses, it takes into account the advantages of ultra-high resolution, large aperture, miniaturization, heat-free operation, and purple fringing optimization. It breaks through the limitation of the difficulty in balancing high performance and miniaturization, and meets the core needs of the current market for high-performance portable imaging devices.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] An ultra-short, large-target-area, high-pixel motion DV optical imaging lens, the optical imaging lens comprising a first lens, a second lens, a third lens, a fourth lens, an aperture stop, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a filter, and an image plane arranged sequentially from the object side to the image side along the optical axis.

[0006] The first lens is a meniscus lens with negative optical power, and the ratio of the focal length f1 of the first lens to the focal length f of the optical imaging lens satisfies the condition: -3.4 < f1 / f < -2.3.

[0007] The second lens is a meniscus lens with negative optical power. The ratio of the focal length f2 of the second lens to the focal length f of the optical imaging lens satisfies the condition: -3.5 < f2 / f < -2.4.

[0008] The third lens is a concave-convex lens with negative optical power, and the ratio of the focal length f3 of the third lens to the focal length f of the optical imaging lens satisfies the condition: -5.1 < f3 / f < -4.1.

[0009] The fourth lens is a concave-convex lens with positive optical power. The ratio of the focal length f4 of the fourth lens to the focal length f of the optical imaging lens satisfies the condition: 1.2 < f4 / f < 2.3.

[0010] The fifth lens is a biconvex lens with positive optical power, and the ratio of the focal length f5 of the fifth lens to the focal length f of the optical imaging lens satisfies the condition: 0.8 < f5 / f < 1.7.

[0011] The sixth lens is a biconcave lens with negative optical power. The ratio of the focal length f6 of the sixth lens to the focal length f of the optical imaging lens satisfies the condition: -4.8 < f6 / f < -3.7.

[0012] The seventh lens is a biconvex lens with positive optical power. The ratio of the focal length f7 of the seventh lens to the focal length f of the optical imaging lens satisfies the condition: 1.4 < f7 / f < 2.5.

[0013] The eighth lens is a biconcave lens with negative optical power. The ratio of the focal length f8 of the eighth lens to the focal length f of the optical imaging lens satisfies the condition: -2.5 < f8 / f < -1.5.

[0014] Preferably, the refractive index n1 of the first lens satisfies the condition: 1.49. <n1<1.59;

[0015] The refractive index n2 of the second lens satisfies the condition: 1.51 <n2<1.63;

[0016] The refractive index n3 of the third lens satisfies the condition: 1.58 <n3<1.69;

[0017] The refractive index n4 of the fourth lens satisfies the condition: 1.84 <n4<1.95;

[0018] The refractive index n5 of the fifth lens satisfies the condition: 1.51 <n5<1.63;

[0019] The refractive index n6 of the sixth lens satisfies the condition: 1.58 <n6<1.69;

[0020] The refractive index n7 of the seventh lens satisfies the condition: 1.51 <n7<1.63;

[0021] The refractive index n8 of the eighth lens satisfies the condition: 1.58 <n8<1.69。

[0022] Preferably, the total optical length (TTL) and back focal length (BFL) of the optical imaging lens satisfy the condition: 10 < TTL / BFL < 11.

[0023] Preferably, the focal length f of the optical imaging lens and the maximum holoimage height IH corresponding to the maximum field of view satisfy the condition: 3.1 < IH / f < 3.8.

[0024] Preferably, the first lens is a spherical glass lens, the fourth lens is an aspherical glass lens, and the second, third, fifth, sixth, seventh, and eighth lenses are all aspherical plastic lenses.

[0025] Preferably, the aperture value of the optical imaging lens is F / NO = 2.6.

[0026] Preferably, the focal length f of the optical imaging lens satisfies the condition: 2.84mm≤f≤3.14mm.

[0027] Preferably, the side of the first lens facing the object side is convex, and the side facing the image side is concave.

[0028] The second lens has a convex surface facing the object side and a concave surface facing the image side;

[0029] The third lens has a convex surface facing the object side and a concave surface facing the image side.

[0030] The fourth lens has a convex surface facing the object side and a concave surface facing the image side.

[0031] The fifth lens has a convex surface with a platform on the object side and a convex surface on the image side.

[0032] The object-side surface of the sixth lens is concave, the image-side surface is concave, and the absolute value of the radius of curvature of the object-side surface of the sixth lens is smaller than the absolute value of the radius of curvature of the image-side surface of the sixth lens.

[0033] The seventh lens has a convex surface on the object side and a convex surface on the image side, and the absolute value of the radius of curvature of the object side of the seventh lens is greater than the absolute value of the radius of curvature of the image side of the seventh lens.

[0034] The eighth lens has a concave surface on the object side and a concave surface on the image side, and the absolute value of the radius of curvature of the object side of the eighth lens is greater than the absolute value of the radius of curvature of the image side of the eighth lens.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] 1. The ultra-short, large-area, high-pixel motion DV optical imaging lens disclosed in this invention adopts an optical structure design of one glass lens, one aspherical glass lens, and six aspherical plastic lenses (referred to as 1G1GM6P). While achieving lens miniaturization, it successfully adapts to large-area (1 / 1.5-inch) chips and achieves a high resolution of 50 million pixels.

[0037] 2. The ultra-short, large-target-area, high-pixel motion DV optical imaging lens disclosed in this invention effectively compensates for thermal drift by introducing a thermal design, enabling the lens to maintain stable imaging within a wide temperature range of -40℃ to 85℃.

[0038] 3. The ultra-short, large-area, high-pixel motion DV optical imaging lens disclosed in this invention optimizes aberrations such as purple fringing through a reasonable combination of aspherical plastic lenses and glass aspherical lenses, and significantly improves imaging quality while ensuring a compact size. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the ultra-short, large-target-area, high-pixel motion DV optical imaging lens in the embodiment;

[0040] Figure 2 The MTF (Mean Transform) diagram of the ultra-short, large-target, high-pixel motion DV optical imaging mirror in the embodiment is shown at 20°C in visible light.

[0041] Figure 3 The image shows the defocusing curve of the ultra-short, large-target, high-pixel motion DV optical imaging mirror in the embodiment at 20°C in visible light.

[0042] Figure 4 The image shows the defocusing curve of the ultra-short, large-target, high-pixel motion DV optical imaging mirror in the embodiment at -40°C in visible light.

[0043] Figure 5 The image shows the defocusing curve of the ultra-short, large-target, high-pixel motion DV optical imaging mirror in the embodiment at 85°C in visible light.

[0044] Figure 6 The image shows the F-THETA distortion of the ultra-short, large-target, high-pixel motion DV optical imaging mirror in the embodiment.

[0045] Figure 7 The field curvature diagram of the ultra-short, large-target, high-pixel motion DV optical imaging mirror in the embodiment is shown in the visible light.

[0046] Figure 8 This is a standard dot matrix diagram of the ultra-short, large-target, high-pixel motion DV optical imaging mirror in the embodiment;

[0047] Figure 9 The image shows the transverse chromatic aberration of the ultra-short, large-target, high-pixel motion DV optical imaging mirror in the 435nm-656nm wavelength range in this embodiment. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Please see Figure 1 The present invention provides an ultra-short, large-target-area, high-pixel motion DV optical imaging lens, which includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, an aperture stop STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter IR, and an image plane IMA arranged sequentially from the object side to the image side along the optical axis.

[0050] In this embodiment, the aperture stop ST0 is positioned between the fourth lens E4 and the fifth lens E5. This position allows off-axis rays to enter the rear lens at a gentler angle, and combined with the alternation of positive and negative optical power at the rear, it significantly improves the uniformity of illumination and image quality consistency in the edge field of view.

[0051] In actual use, the first lens E1 is a spherical glass lens, the fourth lens E4 is an aspherical glass lens, and the second lens E2, the third lens E3, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8 are all aspherical plastic lenses. The combination of glass lenses and aspherical glass lenses provides good temperature stability and aberration correction capability, laying the foundation for pyrotechnic design. This allows the optical imaging lens to maintain focal plane stability in a wide temperature range of -40℃ to 85℃. The six aspherical plastic lenses, through flexible surface design, effectively compress the total optical length and achieve miniaturization while accurately correcting various aberrations such as spherical aberration, coma, astigmatism, and field curvature. This significantly suppresses purple fringing across the entire field of view and improves edge image quality and resolution.

[0052] In practical use, the first lens E1 is a meniscus lens with negative optical power, and the ratio of its focal length f1 to the focal length f of the optical imaging lens satisfies the condition: -3.4 < f1 / f < -2.3; the second lens E2 is a meniscus lens with negative optical power, and the ratio of its focal length f2 to the focal length f of the optical imaging lens satisfies the condition: -3.5 < f2 / f < -2.4; the third lens E3 is a concave-convex lens with negative optical power, and the ratio of its focal length f3 to the focal length f of the optical imaging lens satisfies the condition: -5.1 < f3 / f < -4.1; the fourth lens E4 is a concave-convex lens with positive optical power, and the ratio of its focal length f4 to the focal length f of the optical imaging lens satisfies the condition: 1.2 < f4 / f < 2.3; The fifth lens E5 is a biconvex lens with positive optical power. The ratio of the focal length f5 of the fifth lens E5 to the focal length f of the optical imaging lens satisfies the condition: 0.8 < f5 / f < 1.7; The sixth lens E6 is a biconcave lens with negative optical power. The ratio of the focal length f6 of the sixth lens E6 to the focal length f of the optical imaging lens satisfies the condition: -4.8 < f6 / f < -3.7; The seventh lens E7 is a biconvex lens with positive optical power. The ratio of the focal length f7 of the seventh lens E7 to the focal length f of the optical imaging lens satisfies the condition: 1.4 < f7 / f < 2.5; The eighth lens E8 is a biconcave lens with negative optical power. The ratio of the focal length f8 of the eighth lens E8 to the focal length f of the optical imaging lens satisfies the condition: -2.5 < f8 / f < -1.5. The optical imaging lens configured with these parameters, by rationally allocating and limiting the focal length of each lens, enables the system to shorten the total optical length and achieve miniaturization, while effectively balancing various aberrations such as spherical aberration, coma, astigmatism, and field curvature. At the same time, the above-mentioned reasonable combination of optical power provides sufficient image height support for large target surface sensors, ensuring high-resolution imaging at the 50-megapixel level.

[0053] In actual use, the refractive index n1 of the first lens E1 satisfies the condition: 1.49 < n1 < 1.59; the refractive index n2 of the second lens E2 satisfies the conditional formula: 1.51 < n2 < 1.63; the refractive index n3 of the third lens E3 satisfies the conditional formula: 1.58 < n3 < 1.69; the refractive index n4 of the fourth lens E4 satisfies the conditional formula: 1.84 < n4 < 1.95; the refractive index n5 of the fifth lens E5 satisfies the conditional formula: 1.51 < n5 < 1.63; the refractive index n6 of the sixth lens E6 satisfies the conditional formula: 1.58 < n6 < 1.69; the refractive index n7 of the seventh lens E7 satisfies the conditional formula: 1.51 < n7 < 1.63; the refractive index n8 of the eighth lens E8 satisfies the conditional formula: 1.58 < n8 < 1.69. For the optical imaging lens with this parameter configuration, by reasonably selecting the lens type, while shortening the overall optical length and achieving miniaturization of the lens, chromatic aberration and secondary spectrum are effectively corrected, and the imaging clarity of the full field of view is improved; among them, the high refractive index lens (the fourth lens E4) bears the main optical power to compress the volume, and the low refractive index lens assists in aberration balance and thermal stability, so as to achieve high resolution of 50 million pixels and wide temperature range adaptability under an ultra-short structure.

[0054] In actual use, the overall optical length TTL and the back focal length BFL of the optical imaging lens satisfy the conditional formula: 10 < TTL / BFL < 11. For the optical imaging lens with this parameter configuration, by compressing the back focal length to a very small proportion of the overall optical length, while ensuring the installation space for necessary components such as sensors and filters, the length of the rear optical path is minimized to the greatest extent, so that more axial dimensions are concentrated on the front lens group, realizing the ultra-short overall length design of the overall optical system; at the same time, this ratio ensures that the structural layout between each lens and the sensor is highly compact without redundant space, providing a direct quantitative guarantee for the miniaturization of the optical imaging lens.

[0055] In actual use, the focal length f of the optical imaging lens and the maximum image height IH corresponding to the maximum field of view angle satisfy the conditional formula: 3.1 < IH / f < 3.8. For the optical imaging lens with this parameter configuration, balancing the relationship between the focal length and the maximum image height of the optical imaging system is beneficial for the optical imaging lens to achieve a large target surface design.

[0056] In actual use, the aperture value F / NO of the optical imaging lens is 2.6.

[0057] In actual use, the focal length f of the optical imaging lens satisfies the conditional formula: 2.84 mm ≤ f ≤ 3.14 mm.

[0058] In actual use, the first lens E1 has a convex surface facing the object side and a concave surface facing the image side; the second lens E2 has a convex surface facing the object side and a concave surface facing the image side; the third lens E3 has a convex surface facing the object side and a concave surface facing the image side; the fourth lens E4 has a convex surface facing the object side and a concave surface facing the image side; the fifth lens E5 has a convex surface with a platform facing the object side and a convex surface facing the image side; the sixth lens E6 has a concave surface facing the object side and a concave surface facing the image side, and the sixth lens E6 faces the object side with a platform facing the object side and a concave surface facing the image side. The absolute value of the radius of curvature of the object-side surface of the seventh lens E7 is less than the absolute value of the radius of curvature of the object-side surface of the sixth lens E6; the object-side surface of the seventh lens E7 is convex, the image-side surface is convex, and the absolute value of the radius of curvature of the object-side surface of the seventh lens E7 is greater than the absolute value of the radius of curvature of the image-side surface of the seventh lens E7; the object-side surface of the eighth lens E8 is concave, the image-side surface is concave, and the absolute value of the radius of curvature of the object-side surface of the eighth lens E8 is greater than the absolute value of the radius of curvature of the image-side surface of the eighth lens E8.

[0059] The optical imaging lens disclosed in the above-described specific embodiments employs an optical structure design consisting of one glass lens, one aspherical glass lens, and six aspherical plastic lenses (referred to as 1G1GM6P). This design achieves lens miniaturization while successfully adapting to large-area (1 / 1.5-inch) chips and reaching a high resolution of 50 megapixels. Furthermore, by introducing a heat-free design, thermal drift is effectively compensated, enabling the lens to maintain stable imaging over a wide temperature range of -40℃ to 85℃. In addition, the reasonable combination of aspherical plastic lenses and glass aspherical lenses optimizes aberrations such as purple fringing, significantly improving image quality while maintaining a compact size.

[0060] In this embodiment, the parameters of each component in the optical imaging lens are shown in Table 1:

[0061] In Table 1, Surf represents the mirror number, Radius represents the radius of curvature, Thickness represents the thickness, Index represents the refractive index, ABB represents the Abbe coefficient, and INFINITY represents infinity. Mirror numbers 1 and 2 represent the two mirrors of the first lens E1 along the direction of ray incidence (i.e., the two mirrors near the object side and the two mirrors near the image side), respectively; mirror numbers 3 and 4 represent the two mirrors of the second lens E2 along the direction of ray incidence, respectively; mirror numbers 5 and 6 represent the two mirrors of the third lens E3 along the direction of ray incidence, respectively; mirror numbers 7 and 8 represent the two mirrors of the fourth lens E4 along the direction of ray incidence, respectively; and mirror numbers 10 and 11 represent the two mirrors of the fifth lens E5 along the direction of ray incidence, respectively. The mirrors, numbered 12 and 13, represent the two mirrors of the sixth lens E6 along the direction of light incidence, respectively; the mirrors, numbered 14 and 15, represent the two mirrors of the seventh lens E7 along the direction of light incidence, respectively; the mirrors, numbered 16 and 17, represent the two mirrors of the eighth lens E8 along the direction of light incidence, respectively; the parameter "0.1 (mm)" of the aperture stop STO indicates the distance between the aperture stop and the fifth lens E5; and the parameter "0.941184703" of the mirror number 19 is the distance between the filter (IR) and the imaging plane.

[0062] In this embodiment, the aspherical coefficients of each lens are shown in Table 2:

[0063] In Table 2, R1 represents the radius of curvature of the lens facing the object side, and R2 represents the radius of curvature of the lens facing the image side. A positive radius of curvature indicates that the lens is curved towards the object side, and a negative radius of curvature indicates that the lens is curved towards the image side.

[0064] In Table 2, the aspherical coefficients satisfy the following relationship:

[0065] In Table 2, R1 represents the radius of curvature of the lens facing the object side, and R2 represents the radius of curvature of the lens facing the image side. A positive radius of curvature indicates that the lens is curved towards the object side, and a negative radius of curvature indicates that the lens is curved towards the image side.

[0066] In Table 2, the aspherical coefficients satisfy the following relationship:

[0067] Where Z is the aspherical sagitta, c is the paraxial curvature of the aspherical surface, y is the lens aperture, k is the conic coefficient, a4 is the 4th order aspherical coefficient, a6 is the 6th order aspherical coefficient, a8 is the 8th order aspherical coefficient, and a...10 The aspheric coefficient of order 10, a 12 The aspheric coefficient of order 12, a 14 The aspheric coefficient of order 14, a 16 It is the 16th order aspheric coefficient.

[0068] The optical imaging lens, composed of components with parameters from Tables 1 and 2, has a focal length of 2.99mm, a maximum target area of ​​10.474mm, and an aperture of F / N0 of 2.6. Its performance is tested as follows:

[0069] refer to Figure 2 The modulation transfer function (MTF) graph represents the overall resolving power of an optical system. The horizontal axis represents spatial frequency (cycles per millimeter), and the vertical axis represents the MTF value. The MTF value is used to evaluate the image quality of a lens, ranging from 0 to 1. It is worth noting that the optical transfer function is a relatively accurate, intuitive, and common way to evaluate the image quality of an optical system. A higher and smoother curve indicates better image quality and a stronger ability to reproduce the true image. Figure 2 It can be seen that the MTF in the imaging region near the center of the visible light band is >0.7, indicating good imaging quality.

[0070] refer to Figure 3 The defocus curve shows that the lens has good MTF concentration, which makes focusing easy.

[0071] refer to Figure 4 and Figure 5 It can be seen that the defocus curves at both high and low temperatures meet the requirements of high resolution, and the focus change of the defocus curve is small, so there is no blurring in high and low temperature environments.

[0072] refer to Figure 6 F-THETA has low distortion, and the lower the distortion, the less the compression at the edges of the image.

[0073] refer to Figure 7 The field curvature value should be controlled between -0.1mm and 0.1mm. The smaller the field curvature value, the better the image quality of the lens.

[0074] refer to Figure 8 The diagram shows a standard dot matrix of optical lenses.

[0075] refer to Figure 9 , Transverse chromatic aberration diagram of optical lens wavelengths from 435nm to 656nm.

[0076] In summary, the patent disclosed in this application is an ultra-short, large-area, high-pixel motion DV optical imaging lens. Structurally, it adopts a 1G1GM6P design. By limiting the focal length of each lens and rationally selecting materials, the maximum half-image height of the optical system reaches 5.237mm, and the purple fringing chromatic aberration corresponding to the maximum half-image height is only about 7um, which can be matched with a 50-megapixel chip.

[0077] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0078] Where Z is the aspherical sagitta, c is the paraxial curvature of the aspherical surface, y is the lens aperture, k is the conic coefficient, a4 is the 4th order aspherical coefficient, a6 is the 6th order aspherical coefficient, a8 is the 8th order aspherical coefficient, and a... 10 The aspheric coefficient of order 10, a 12 The aspheric coefficient of order 12, a 14 The aspheric coefficient of order 14, a 16 It is the 16th order aspheric coefficient.

[0079] The optical imaging lens, composed of components with parameters from Tables 1 and 2, has a focal length of 2.99mm, a maximum target area of ​​10.474mm, and an aperture of F / N0 of 2.6. Its performance is tested as follows:

[0080] refer to Figure 2 The modulation transfer function (MTF) graph represents the overall resolving power of an optical system. The horizontal axis represents spatial frequency (cycles per millimeter), and the vertical axis represents the MTF value. The MTF value is used to evaluate the image quality of a lens, ranging from 0 to 1. It is worth noting that the optical transfer function is a relatively accurate, intuitive, and common way to evaluate the image quality of an optical system. A higher and smoother curve indicates better image quality and a stronger ability to reproduce the true image. Figure 2 It can be seen that the MTF in the imaging region near the center of the visible light band is >0.7, indicating good imaging quality.

[0081] refer to Figure 3 The defocus curve shows that the lens has good MTF concentration, which makes focusing easy.

[0082] refer to Figure 4 and Figure 5 It can be seen that the defocus curves at both high and low temperatures meet the requirements of high resolution, and the focus change of the defocus curve is small, so there is no blurring in high and low temperature environments.

[0083] refer to Figure 6 F-THETA has low distortion, and the lower the distortion, the less the compression at the edges of the image.

[0084] refer to Figure 7 The field curvature value should be controlled between -0.1mm and 0.1mm. The smaller the field curvature value, the better the image quality of the lens.

[0085] refer to Figure 8 The diagram shows a standard dot matrix of optical lenses.

[0086] refer to Figure 9 , Transverse chromatic aberration diagram of optical lens wavelengths from 435nm to 656nm.

[0087] In summary, the patent disclosed in this application is an ultra-short, large-area, high-pixel motion DV optical imaging lens. Structurally, it adopts a 1G1GM6P design. By limiting the focal length of each lens and rationally selecting materials, the maximum half-image height of the optical system reaches 5.237mm, and the purple fringing chromatic aberration corresponding to the maximum half-image height is only about 7um, which can be matched with a 50-megapixel chip.

[0088] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ultra-short, large-area, high-pixel motion DV optical imaging lens, characterized in that: The optical imaging lens includes a first lens, a second lens, a third lens, a fourth lens, an aperture stop, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a filter, and an image plane arranged sequentially from the object side to the image side along the optical axis. The first lens is a meniscus lens with negative optical power, and the ratio of the focal length f1 of the first lens to the focal length f of the optical imaging lens satisfies the condition: -3.4 < f1 / f < -2.

3. The second lens is a meniscus lens with negative optical power. The ratio of the focal length f2 of the second lens to the focal length f of the optical imaging lens satisfies the condition: -3.5 < f2 / f < -2.

4. The third lens is a concave-convex lens with negative optical power, and the ratio of the focal length f3 of the third lens to the focal length f of the optical imaging lens satisfies the condition: -5.1 < f3 / f < -4.

1. The fourth lens is a concave-convex lens with positive optical power. The ratio of the focal length f4 of the fourth lens to the focal length f of the optical imaging lens satisfies the condition: 1.2 < f4 / f < 2.

3. The fifth lens is a biconvex lens with positive optical power, and the ratio of the focal length f5 of the fifth lens to the focal length f of the optical imaging lens satisfies the condition: 0.8 < f5 / f < 1.

7. The sixth lens is a biconcave lens with negative optical power. The ratio of the focal length f6 of the sixth lens to the focal length f of the optical imaging lens satisfies the condition: -4.8 < f6 / f < -3.

7. The seventh lens is a biconvex lens with positive optical power. The ratio of the focal length f7 of the seventh lens to the focal length f of the optical imaging lens satisfies the condition: 1.4 < f7 / f < 2.

5. The eighth lens is a biconcave lens with negative optical power. The ratio of the focal length f8 of the eighth lens to the focal length f of the optical imaging lens satisfies the condition: -2.5 < f8 / f < -1.

5.

2. The ultra-short, large-target-area, high-pixel motion DV optical imaging lens according to claim 1, characterized in that: The refractive index n1 of the first lens satisfies the condition: 1.49 <n1<1.59; The refractive index n2 of the second lens satisfies the condition: 1.51 <n2<1.63; The refractive index n3 of the third lens satisfies the condition: 1.58 <n3<1.69; The refractive index n4 of the fourth lens satisfies the condition: 1.84 <n4<1.95; The refractive index n5 of the fifth lens satisfies the condition: 1.51 <n5<1.63; The refractive index n6 of the sixth lens satisfies the condition: 1.58 <n6<1.69; The refractive index n7 of the seventh lens satisfies the condition: 1.51 <n7<1.63; The refractive index n8 of the eighth lens satisfies the condition: 1.58 <n8<1.69。 3. The ultra-short, large-area, high-pixel motion DV optical imaging lens according to claim 1, characterized in that: The total optical length (TTL) and back focal length (BFL) of the optical imaging lens satisfy the condition: 10 < TTL / BFL < 11.

4. The ultra-short, large-target-area, high-pixel motion DV optical imaging lens according to claim 1, characterized in that: The focal length f of the optical imaging lens and the maximum holoimage height IH corresponding to the maximum field of view satisfy the condition: 3.1 < IH / f < 3.

8.

5. The ultra-short, large-target-area, high-pixel motion DV optical imaging lens according to claim 1, characterized in that: The first lens is a spherical glass lens, the fourth lens is an aspherical glass lens, and the second, third, fifth, sixth, seventh, and eighth lenses are all aspherical plastic lenses.

6. The ultra-short, large-target-area, high-pixel motion DV optical imaging lens according to claim 1, characterized in that: The aperture value of the optical imaging lens is F / NO = 2.

6.

7. The ultra-short, large-target-area, high-pixel motion DV optical imaging lens according to claim 1, characterized in that: The focal length f of the optical imaging lens satisfies the condition: 2.84mm≤f≤3.14mm.

8. The ultra-short, large-target-area, high-pixel motion DV optical imaging lens according to claim 1, characterized in that: The first lens has a convex surface facing the object side and a concave surface facing the image side; The second lens has a convex surface facing the object side and a concave surface facing the image side; The third lens has a convex surface facing the object side and a concave surface facing the image side. The fourth lens has a convex surface facing the object side and a concave surface facing the image side. The fifth lens has a convex surface with a platform on the object side and a convex surface on the image side. The object-side surface of the sixth lens is concave, the image-side surface is concave, and the absolute value of the radius of curvature of the object-side surface of the sixth lens is smaller than the absolute value of the radius of curvature of the image-side surface of the sixth lens. The seventh lens has a convex surface on the object side and a convex surface on the image side, and the absolute value of the radius of curvature of the object side of the seventh lens is greater than the absolute value of the radius of curvature of the image side of the seventh lens. The eighth lens has a concave surface on the object side and a concave surface on the image side, and the absolute value of the radius of curvature of the object side of the eighth lens is greater than the absolute value of the radius of curvature of the image side of the eighth lens.

Images