Low-distortion small-size high-pixel optical system and camera module using the same

Abstract

This invention provides a low-distortion, small-volume, high-pixel optical system and its application in a camera module, mainly composed of seven lenses. The first lens has negative optical power and its image-side surface is concave; the second lens has positive optical power and its object-side surface is convex, as is its image-side surface; the third lens has optical power; the fourth lens has optical power; the fifth lens has positive optical power and its image-side surface is convex; the sixth lens has positive optical power and its object-side surface is convex, as is its image-side surface; and the seventh lens has negative optical power and its object-side surface is concave. The system features a reasonable number of lenses and a simple structure. By rationally allocating the optical power of the lenses, lens aberrations are optimized, improving the imaging quality of the optical system. It offers advantages such as low distortion, small size, large aperture, and high pixel count. Furthermore, the large aperture configuration increases the amount of light entering the optical system and provides even higher imaging quality.

Description

Technical Field

[0001] This application relates to the field of optical imaging, and more particularly to a low-distortion, small-volume, high-pixel optical system and its application in the field of automotive front-view imaging. Background Technology

[0002] With the rapid development of camera lenses in the field of automotive front-view, people have higher and higher requirements for the image quality of lenses. They not only need to be small in size and have high resolution, but also need to have low distortion.

[0003] Currently, many lenses on the market produce images that are unclear, noisy, and have low resolution, failing to meet the requirements of low distortion and high definition. If a lens has a large aperture and a small size, while also achieving high pixel count, it will be highly competitive in the market. Summary of the Invention

[0004] To overcome the shortcomings of existing automotive front-view lenses, such as unclear images and low recognition, this invention provides an optical system for automotive front-view applications. This system has the advantages of low distortion, small size, large aperture, and high pixel count. At the same time, the large aperture configuration can increase the amount of light entering the optical system and achieve higher image quality.

[0005] A low-distortion, small-volume, high-pixel optical system is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence along the optical axis from the object plane to the image plane. The first lens has negative optical power and its image side is concave.

[0006] The second lens has positive optical power, and its object side is convex, as is its image side.

[0007] The third lens has optical power;

[0008] The fourth lens has optical power;

[0009] The fifth lens has positive optical power and its image-side surface is convex.

[0010] The sixth lens has positive optical power, and its object side is convex, and its image side is convex.

[0011] The seventh lens has negative optical power and its object side is concave.

[0012] Preferably, each lens of the optical system satisfies the following conditions:

[0013] -30.0mm <f1<0.0mm;

[0014] 5.0mm <f2<30.0mm;

[0015] -10.0mm <f3<15.0mm;

[0016] -10.0mm <f4<15.0mm;

[0017] -350.0mm <f34<-10.0mm;

[0018] 10.0mm <f5<30.0mm;

[0019] 5.0mm <f6<20.0mm;

[0020] -20.0mm <f7<-5.0mm;

[0021] Where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f34 is the combined focal length of the third and fourth lenses, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.

[0022] Preferably, each lens of the optical system satisfies the following conditions:

[0023] -5.0 <f1 / f<2.0;

[0024] 0.0 <f2 / f<5.0;

[0025] -3.0 <f3 / f<4.0;

[0026] -3.0 <f4 / f<6.0;

[0027] -40.0 <f34 / f<2.0;

[0028] 0.0 <f5 / f<8.0;

[0029] 0.0 <f6 / f<5.0;

[0030] -3.0 <f7 / f<5.0;

[0031] Where f is the focal length of the entire optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f34 is the combined focal length of the third and fourth lenses, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.

[0032] Preferably, the optical system satisfies the following condition: 1.60 <f / ENPD<2.00;

[0033] Where f is the effective focal length of the optical system, and ENPD is the entrance pupil diameter.

[0034] Preferably, the optical system satisfies the following condition: 0.80 <f / TTL*ImagH<3.00;

[0035] Where f is the effective focal length of the optical system, TTL is the on-axis distance from the object side of the first lens to the imaging plane, and ImagH is half the diagonal length of the effective pixel area on the imaging plane.

[0036] Preferably, the optical system satisfies the following condition: the refractive index Nd1 and Abbe constant Vd1 of the first lens material satisfy: 1.69. <Nd1<2.00,25<Vd1<57。

[0037] Preferably, the optical system satisfies the following condition: the refractive index Nd2 and Abbe number Vd2 of the second lens material satisfy: 1.50. <Nd2<2.00,17<Vd2<66。

[0038] Preferably, the optical system satisfies the following condition: the refractive index Nd3 and Abbe number Vd3 of the third lens material satisfy: 1.43. <Nd3<1.62,63<Vd3<95。

[0039] Preferably, the optical system satisfies the following condition: the refractive index Nd4 and Abbe number Vd4 of the fourth lens material satisfy: 1.50. <Nd4<2.00,17<Vd4<68。

[0040] Preferably, the optical system satisfies the following condition: the refractive index Nd5 and Abbe number Vd5 of the fifth lens material satisfy: 1.43. <Nd5<1.62,63<Vd5<95。

[0041] Preferably, the optical system satisfies the following conditions: the refractive index Nd6 and Abbe number Vd6 of the sixth lens material satisfy 1.50. <Nd6<2.00,17<Vd6<68。

[0042] Preferably, the optical system satisfies the following conditions: the refractive index Nd7 and Abbe number Vd7 of the seventh lens material satisfy: 1.50. <Nd7<2.00,17<Vd7<68。

[0043] On the other hand, this application embodiment also provides a camera module, which includes at least an optical lens, and the optical lens is equipped with the above-mentioned low distortion, small volume, high pixel optical system.

[0044] Compared with the prior art, the beneficial effects of this application are as follows:

[0045] This invention provides a low-distortion, small-volume, high-pixel optical system and its application in a camera module, mainly composed of seven lenses. The first lens has negative optical power and its image-side surface is concave; the second lens has positive optical power and its object-side surface is convex, as is its image-side surface; the third lens has optical power; the fourth lens has optical power; the fifth lens has positive optical power and its image-side surface is convex; the sixth lens has positive optical power and its object-side surface is convex, as is its image-side surface; and the seventh lens has negative optical power and its object-side surface is concave. The system features a reasonable number of lenses and a simple structure. By rationally allocating the optical power of the lenses, lens aberrations are optimized, improving the imaging quality of the optical system. It offers advantages such as low distortion, small size, large aperture, and high pixel count. Furthermore, the large aperture configuration increases the amount of light entering the optical system and provides even higher imaging quality. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0047] Figure 1 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 1 of this application;

[0048] Figure 2 This is a graph showing the astigmatism and distortion of the optical system or camera module in Embodiment 1 of this application;

[0049] Figure 3 This is the MTF curve of the optical system or camera module of Embodiment 1 of this application;

[0050] Figure 4 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 2 of this application;

[0051] Figure 5 This is a graph showing the astigmatism and distortion of the optical system or camera module in Embodiment 2 of this application;

[0052] Figure 6 This is the MTF curve of the optical system or camera module in Embodiment 2 of this application;

[0053] Figure 7 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 3 of this application;

[0054] Figure 8 This is a graph showing the astigmatism and distortion of the optical system or camera module in Embodiment 3 of this application;

[0055] Figure 9 This is the MTF curve of the optical system or camera module of Embodiment 3 of this application;

[0056] Figure 10It is a schematic structural diagram of the optical system or camera module in Embodiment 4 of the present application;

[0057] Figure 11 It is the astigmatism and distortion curve graph of the optical system or camera module in Embodiment 4 of the present application;

[0058] Figure 12 It is the MTF curve graph of the optical system or camera module in Embodiment 4 of the present application. Specific Embodiment

[0059] As Figure 1-12 shown, the present application provides a vehicle-mounted optical system, which mainly consists of seven lenses. Along the optical axis from the object plane to the image plane E9, it successively includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and a filter E8. The first lens has a negative focal power, and its image side is concave; the second lens has a positive focal power, its object side is convex, and its image side is convex; the third lens has a focal power; the fourth lens has a focal power; the fifth lens has a positive focal power, and its image side is convex; the sixth lens has a positive focal power, its object side is convex, and its image side is convex; the seventh lens has a negative focal power, and its object side is concave. The number of lens elements is reasonable and the structure is simple. By reasonably distributing the focal powers of the lenses, the lens aberrations are optimized, and the imaging quality of the optical system is improved. It has the advantages of low distortion, small volume, large aperture, and high pixel. At the same time, the configuration of the large aperture can increase the light input of the optical system and higher imaging quality.

[0060] Furthermore, as a preferred embodiment rather than a limitation of the present invention, each lens of the optical system satisfies the following conditions: -30.0mm < f1 < 0.0mm; 5.0mm < f2 < 30.0mm; -10.0mm < f3 < 15.0mm; -10.0mm < f4 < 15.0mm; -350.0mm < f34 < -10.0mm; 10.0mm < f5 < 30.0mm; 5.0mm < f6 < 20.0mm; -20.0mm < f7 < -5.0mm; where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f34 is the combined focal length of the third lens and the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens. By reasonably controlling the effective focal lengths of each lens of the optical system, the optical system can have the advantages of low distortion, small volume, large aperture, and high pixel. At the same time, the configuration of the large aperture can increase the light input of the optical system and higher imaging quality.

[0061] Further, as a preferred implementation manner rather than a limitation of the present invention, each lens of the optical system satisfies the following conditions: -5.0 < f1 / f < 2.0; 0.0 < f2 / f < 5.0; -3.0 < f3 / f < 4.0; -3.0 < f4 / f < 6.0; -40.0 < f34 / f < 2.0; 0.0 < f5 / f < 8.0; 0.0 < f6 / f < 5.0; -3.0 < f7 / f < 5.0; where f is the focal length of the entire optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f34 is the combined focal length of the third lens and the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens. By restricting the ratio of the focal lengths of each lens and the optical system within a reasonable range, not only the excellent image quality of the optical system is ensured, but also the good processability of the system is guaranteed, the system aberration is improved, and good imaging quality can be achieved.

[0062] Further, as a preferred implementation manner rather than a limitation of the present invention, the optical system satisfies the following condition: 1.60 < f / ENPD < 2.00; where f is the effective focal length of the optical system and ENPD is the entrance pupil diameter. By making the optical lens satisfy the above conditional formula, on the premise of meeting the high light transmittance, the small aperture of the optical lens can be ensured to achieve the miniaturization of the optical lens.

[0063] Further, as a preferred implementation manner rather than a limitation of the present invention, the optical system satisfies the following condition: 0.80 < f / TTL*ImagH < 3.00; where f is the effective focal length of the optical system, TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and ImagH is half of the diagonal length of the effective pixel area on the imaging surface. This relational expression reflects the constraint situation of the optical lens in terms of the field angle and the thin and light characteristics. When the above relational expression is satisfied, on the basis of meeting the wide-angle field of view of the optical lens, the market demand for the small head and thin and light characteristics of the optical lens can be met. When exceeding the upper limit of the relational expression, on the basis of ensuring that the field angle of the optical lens is wide, f / TTL*ImagH is further reduced, which will overly compress the thin and light characteristics of the optical lens and is not conducive to the improvement of the performance of the optical lens. When lower than the lower limit of the relational expression, the thin and light characteristics of the optical lens are insufficient, which is not conducive to the miniaturization design of the optical lens.

[0064] Further, as a preferred embodiment of the present invention rather than a limitation, the optical system satisfies the following conditions: The refractive index Nd1 and Abbe number Vd1 of the material of the first lens satisfy: 1.69 < Nd1 < 2.00, 25 < Vd1 < 57. The refractive index Nd2 and Abbe number Vd2 of the material of the second lens satisfy: 1.50 < Nd2 < 2.00, 17 < Vd2 < 66. The refractive index Nd3 and Abbe number Vd3 of the material of the third lens satisfy: 1.43 < Nd3 < 1.62, 63 < Vd3 < 95. The refractive index Nd4 and Abbe number Vd4 of the material of the fourth lens satisfy: 1.50 < Nd4 < 2.00, 17 < Vd4 < 68. The refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens satisfy: 1.43 < Nd5 < 1.62, 63 < Vd5 < 95. The refractive index Nd6 and Abbe number Vd6 of the material of the sixth lens satisfy: 1.50 < Nd6 < 2.00, 17 < Vd6 < 68. The refractive index Nd7 and Abbe number Vd7 of the material of the seventh lens satisfy: 1.50 < Nd7 < 2.00, 17 < Vd7 < 68. By defining the relationship between the refractive index and Abbe number of each lens, it is beneficial to reduce aberration and improve the image quality of the high-pixel optical system. Specific embodiments:

[0066] Embodiment 1:

[0067] The following refers to Figures 1 to 3 Describe the optical imaging lens according to Embodiment 1 of the present application. Figure 1 Fig. shows a schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present application.

[0068] As Figure 1 shown, the optical imaging lens according to an exemplary embodiment of the present application sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a second lens E2, STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an imaging surface S17.

[0069] The first lens E1 has a negative optical power, and its image side surface S2 is concave. The second lens E2 has a positive optical power, its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has an optical power. The fourth lens E4 has an optical power. The fifth lens E5 has a positive optical power, and its image side surface S10 is convex. The sixth lens E6 has a positive optical power, its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has a negative optical power, and its object side surface S13 is concave. The light from the object sequentially passes through each surface S 1 to S 16 and finally forms an image on the imaging surface S17.

[0070] Table 1 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 1, wherein the units for radius of curvature and thickness are millimeters (mm).

[0071] Table 1

[0072]

[0073] Figure 2 The astigmatism and distortion curves of the optical imaging lens of Example 1 are shown. Astigmatism represents the meridional image plane curvature and the sagittal image plane curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0074] Figure 3 The MTF curve of the optical imaging lens of Example 1 is shown, which represents the MTF values ​​in the meridional and sagittal directions of different fields of view.

[0075] The optical imaging lens given in Example 1 can achieve good imaging quality.

[0076] Example 2

[0077] The following is for reference Figures 4 to 6 Describes an optical imaging lens according to Embodiment 2 of this application. Figure 4 A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown.

[0078] like Figure 4 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an imaging plane S17.

[0079] The first lens E1 has negative optical power, and its image-side surface S2 is concave. The second lens E2 has positive optical power, and its object-side surface S3 and image-side surface S4 are convex. The third lens E3 has optical power. The fourth lens E4 has optical power. The fifth lens E5 has positive optical power, and its image-side surface S10 is convex. The sixth lens E6 has positive optical power, and its object-side surface S11 and image-side surface S12 are convex. The seventh lens E7 has negative optical power, and its object-side surface S13 is concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0080] Table 2 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 2, wherein the units for radius of curvature and thickness are millimeters (mm).

[0081] Table 2

[0082]

[0083] Figure 5 The astigmatism and distortion curves of the optical imaging lens of Example 2 are shown. Astigmatism represents the meridional image plane curvature and the sagittal image plane curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0084] Figure 6 The MTF curve of the optical imaging lens of Example 2 is shown, which represents the MTF values ​​in the meridional and sagittal directions of different fields of view.

[0085] The optical imaging lens given in Example 2 can achieve good imaging quality.

[0086] Example 3

[0087] The following is for reference Figures 7 to 9 Describes an optical imaging lens according to Embodiment 3 of this application. Figure 7 A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown.

[0088] like Figure 7 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an imaging plane S17.

[0089] The first lens E1 has negative optical power, and its image-side surface S2 is concave. The second lens E2 has positive optical power, and its object-side surface S3 and image-side surface S4 are convex. The third lens E3 has optical power. The fourth lens E4 has optical power. The fifth lens E5 has positive optical power, and its image-side surface S10 is convex. The sixth lens E6 has positive optical power, and its object-side surface S11 and image-side surface S12 are convex. The seventh lens E7 has negative optical power, and its object-side surface S13 is concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0090] Table 3 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 3, wherein the units for radius of curvature and thickness are millimeters (mm).

[0091] Table 3

[0092]

[0093] Figure 8 The astigmatism and distortion curves of the optical imaging lens of Example 3 are shown. Astigmatism represents the meridional image plane curvature and the sagittal image plane curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0094] Figure 9 The MTF curve of the optical imaging lens of Example 3 is shown, which represents the MTF values ​​in the meridional and sagittal directions of different fields of view.

[0095] The optical imaging lens given in Example 3 can achieve good imaging quality.

[0096] Example 4

[0097] The following is for reference Figures 10 to 12 The optical imaging lens according to Embodiment 4 of this application is described. Figure 10 A schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of this application is shown.

[0098] like Figure 10 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an imaging plane S17.

[0099] The first lens E1 has negative optical power, and its image-side surface S2 is concave. The second lens E2 has positive optical power, and its object-side surface S3 and image-side surface S4 are convex. The third lens E3 has optical power. The fourth lens E4 has optical power. The fifth lens E5 has positive optical power, and its image-side surface S10 is convex. The sixth lens E6 has positive optical power, and its object-side surface S11 and image-side surface S12 are convex. The seventh lens E7 has negative optical power, and its object-side surface S13 is concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0100] Table 4 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 4, wherein the units for radius of curvature and thickness are millimeters (mm).

[0101] Table 4

[0102]

[0103] Figure 11 The astigmatism and distortion curves of the optical imaging lens of Example 4 are shown. Astigmatism represents the meridional image plane curvature and the sagittal image plane curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0104] Figure 12 The MTF curve of the optical imaging lens of Example 4 is shown, which represents the MTF values ​​in the meridional and sagittal directions of different fields of view.

[0105] The optical imaging lens given in Example 4 can achieve good imaging quality.

[0106] A camera module includes at least an optical lens, in which the aforementioned vehicle-mounted optical system is installed. The vehicle-mounted forward-looking optical system of this application has the advantages of low distortion, small size, large aperture, and high pixel count. At the same time, the large aperture configuration can increase the amount of light entering the optical system and achieve higher image quality.

[0107] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of the present invention is limited to these descriptions. Any methods or structures that are similar to or identical to those of the present invention, or any technical deductions or substitutions made based on the concept of the present invention, should be considered within the scope of protection of the present invention.

Claims

1. A low-distortion, small-volume, high-pixel optical system, comprising, sequentially from the object plane to the image plane along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, characterized in that: The first lens has a negative optical power, and its image side is concave; The second lens has a positive optical power, its object side is convex, and its image side is convex; The third lens has an optical power; The fourth lens has an optical power; The fifth lens has a positive optical power, and its image side is convex; The third lens and the fourth lens form a cemented lens; The sixth lens has a positive optical power, its object side is convex, and its image side is convex; The seventh lens has a negative optical power, and its object side is concave; The optical system satisfies the following conditions: 1.60 < f / ENPD < 2.00; 0.80mm < f / TTL*ImagH < 3.00mm; 0.0 < f2 / f < 5.0; -3.0 < f3 / f < 4.0; -3.0 < f4 / f < 6.0; -40.0 < f3"4 / f < 2.0; 0.0 < f5 / f < 8.0; 0.0 < f6 / f < 5.0; Where, f is the focal length of the entire optical system, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f3"4 is the combined focal length of the third lens and the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, ENPD is the entrance pupil diameter, TTL is the axial distance from the object side of the first lens to the imaging surface, and ImagH is half of the diagonal length of the effective pixel area on the imaging surface.

2. The low-distortion, small-volume, high-pixel optical system according to claim 1, characterized in that: Each lens of the optical system satisfies the following conditions: -30.0mm < f1 < 0.0mm; 5.0mm < f2 < 30.0mm; -10.0mm < f3 < 15.0mm; -10.0mm < f4 < 15.0mm; -350.0mm < f3"4 < -10.0mm; 10.0mm < f5 < 30.0mm; 5.0mm < f6 < 20.0mm; -20.0mm < f7 < -5.0mm; Where, f1 is the focal length of the first lens, and f7 is the focal length of the seventh lens.

3. The low-distortion, small-volume, high-pixel optical system according to any one of claims 1-2, characterized in that: The optical system satisfies the following conditions: The refractive index Nd1 and Abbe number Vd1 of the material of the first lens satisfy: 1.69 < Nd1 < 2.00, 25 < Vd1 < 57; and / or The refractive index Nd2 and Abbe number Vd2 of the material of the second lens satisfy: 1.50 < Nd2 < 2.00, 17 < Vd2 < 66.

4. The low-distortion, small-volume, high-pixel optical system according to any one of claims 1-2, characterized in that: The optical system satisfies the following conditions: The refractive index Nd3 and Abbe number Vd3 of the material of the third lens satisfy: 1.43 < Nd3 < 1.62, 63 < Vd3 < 95.

5. The low-distortion, small-volume, high-pixel optical system according to any one of claims 1-2, characterized in that: The optical system satisfies the following conditions: The refractive index Nd4 and Abbe number Vd4 of the material of the fourth lens satisfy: 1.50 < Nd4 < 2.00, 17 < Vd4 < 68; and / or The optical system satisfies the following conditions: The refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens satisfy: 1.43 < Nd5 < 1.62, 63 < Vd5 < 95.

6. The low-distortion, small-volume, high-pixel optical system according to any one of claims 1-2, characterized in that: The refractive index Nd6 and Abbe number Vd6 of the material of the sixth lens satisfy: 1.50 < Nd6 < 2.00, 17 < Vd6 < 68.

7. The low-distortion, small-volume, high-pixel optical system according to any one of claims 1-2, characterized in that: The optical system satisfies the following conditions: the refractive index Nd7 and Abbe number Vd7 of the seventh lens material satisfy 1.

50. <Nd7<2.00,17<Vd7<68。 8. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with a low-distortion, small-volume, high-pixel optical system as described in any one of claims 1-7.

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