High-pixel large-target-surface front-view optical system and camera module applied by high-pixel large-target-surface front-view optical system

Abstract

According to the high-pixel large-target-surface front-view optical system and the camera module applying the same, the optical system is composed of seven lenses, through reasonable matching of shapes and focal power of all the lenses, the optical system has the design advantages of being stable in performance, high in pixel, large in target surface, free of thermalization and free of ghost images; the imaging range and distortion requirements of the foresight intelligent driving optical system are effectively met, and the imaging effect of equipment matched with the system is improved.

Description

Technical Field

[0001] This application relates to the field of optical imaging, and in particular to a high-pixel large target front-view optical system and its application in camera modules. Background Technology

[0002] In recent years, with the continuous development of intelligent driving technology and the emergence of numerous automotive applications, automotive lenses, as a core and critical component of intelligent driving systems, are directly related to the safety of vehicles using such systems. Therefore, customers have increasingly higher requirements for lens size, imaging performance, and cost. Providing a high-performance lens that is stable, has high resolution, a large sensor area, is free from pyrolysis, and eliminates ghosting has become a sought-after goal. Summary of the Invention

[0003] To overcome the problem of the generally poor imaging performance of existing vehicle-mounted lenses, this application provides a high-pixel large target front-view optical system with the advantages of high pixel count, high resolution, and ultra-wide-angle design.

[0004] A high-pixel large target front-view optical system, consisting 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;

[0005] The first lens has negative optical power, and its object side is concave, and its image side is concave;

[0006] The second lens has negative optical power, with its object side being concave and its image side being convex.

[0007] The third lens has positive optical power, and its object side is convex, while its image side is concave or flat.

[0008] The fourth lens has positive optical power, and its object side is convex, as is its image side;

[0009] The fifth lens has positive optical power, and its object side is convex, as is its image side;

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

[0011] The fifth lens and the sixth lens form a bonded lens, and its optical power is positive.

[0012] The seventh lens has positive optical power, with its object side being convex and its image side being concave.

[0013] Preferably, the optical system satisfies the following condition: D1 / (Fno*Ymax) < 0.144;

[0014] Where D1 is the maximum effective optical diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system.

[0015] Preferably, the optical system satisfies the following conditions:

[0016] -10.68mm < f1 < -8.72mm;

[0017] -150.37mm < f2 < -88.40mm;

[0018] 15.50mm < f3 < 25.00mm;

[0019] 20.05mm < f4 < 25.30mm;

[0020] 9.60mm < f5 < 13.40mm;

[0021] -16.80mm < f6 < -11.25mm;

[0022] 86.70 < f7 < 155.35 mm;

[0023] Where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0024] Preferably, the optical system satisfies the following conditions:

[0025] -5.0 < f1 / f < -1.0;

[0026] -18.0 < f2 / f < -11.2;

[0027] 1.7 < f3 / f < 3.4;

[0028] 2.0 < f4 / f < 3.1;

[0029] 1.2 < f5 / f < 1.9;

[0030] -2.1 < f6 / f < -0.8;

[0031] 10.7 < f7 / f < 19.3;

[0032] Where f is the focal length of the entire optical system, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0033] Preferably, the optical system satisfies the following condition: (dn / dt)² < -1.6 * 10⁻⁶ -06 / ℃; Nd2<1.65; Vd2>60.0; where (dn / dt)2 is the temperature coefficient of refractive index of the second lens, Nd2 is the refractive index of the second lens material, and Vd2 is the Abbe number of the second lens material.

[0034] Preferably, the optical system satisfies the following conditions: -1.13 < f5 / f6 < -0.65; 2.95 < Vd5 / Vd6 < 4.13; where f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, Vd5 is the Abbe number of the fifth lens, and Vd6 is the Abbe number of the sixth lens.

[0035] Preferably, the optical system satisfies the following condition: f56 / f4 < 2.450; where f56 is the effective focal length of the bonded lens and f4 is the effective focal length of the fourth lens.

[0036] Preferably, the optical system satisfies the following conditions: |R2 / R3|>1.00; |R12 / R13|>1.125; where R2 is the object-side radius of curvature of the first lens, R3 is the image-side radius of curvature of the second lens, R12 is the image-side radius of curvature of the sixth lens, and R13 is the object-side radius of curvature of the seventh lens.

[0037] Preferably, the optical system satisfies the following conditions: the field of view (FOV) of the optical system is ∈ [50°, 80°], and the total length of the optical system is 30mm ≤ TTL ≤ 40mm.

[0038] Preferably, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are spherical lenses, and the seventh lens is an aspherical lens.

[0039] Preferably, the aperture stop is located between the third lens and the fourth lens, or between the fourth lens and the fifth lens.

[0040] 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 high-pixel large target front-view optical system.

[0041] Compared with the prior art, the beneficial effects of this application are as follows:

[0042] This invention provides a high-pixel large target front-view optical system and its application camera module. The optical system consists of 7 lenses. Through the reasonable combination of the shape and optical power of each lens, it has the design advantages of stable performance, high pixel count, large target area, no heat generation, and no ghosting. It effectively meets the imaging range and distortion requirements of the front-view intelligent driving optical system and improves the imaging effect of the equipment paired with the system. Attached Figure Description

[0043] 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.

[0044] Figure 1 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 1 of this application;

[0045] Figure 2 The field curvature curve and distortion curve of the optical system or camera module in Embodiment 1 of this application;

[0046] Figure 3 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 2 of this application;

[0047] Figure 4 The field curvature curve and distortion curve of the optical system or camera module in Embodiment 2 of this application;

[0048] Figure 5 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 3 of this application;

[0049] Figure 6 These are the field curvature curves and distortion curves of the optical system or camera module in Embodiment 3 of this application. Detailed Implementation

[0050] like Figure 1-6 As shown, this application provides a high-pixel large target front-view optical system, which 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;

[0051] The first lens has negative optical power, and its object side is concave, and its image side is concave;

[0052] The second lens has negative optical power, with its object side being concave and its image side being convex.

[0053] The third lens has positive optical power, and its object side is convex, while its image side is concave or flat.

[0054] The fourth lens has positive optical power, and its object side is convex, as is its image side;

[0055] The fifth lens has positive optical power, and its object side is convex, as is its image side;

[0056] The sixth lens has negative optical power, and its object side is concave while its image side is convex.

[0057] The fifth lens and the sixth lens form a bonded lens, and its optical power is positive.

[0058] The seventh lens has positive optical power, with its object side being convex and its image side being concave.

[0059] The optical system of this application embodiment consists of 7 lenses. Through the reasonable combination of the shape and optical power of each lens, it has the design advantages of stable performance, high pixel count, large target surface, no heat generation, and no ghosting. It effectively meets the imaging range and distortion requirements of the forward-looking intelligent driving optical system and improves the imaging effect of the equipment paired with the system.

[0060] Furthermore, the optical system satisfies the following condition: D1 / (Fno*Ymax)<0.144; where D1 is the maximum effective optical diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system. By limiting the maximum image circle and aperture size of the optical imaging system, the purpose of limiting the effective optical diameter of the first lens is achieved.

[0061] Furthermore, the optical system satisfies the following condition:

[0062] -10.68mm < f1 < -8.72mm;

[0063] -150.37mm < f2 < -88.40mm;

[0064] 15.50mm < f3 < 25.00mm;

[0065] 20.05mm < f4 < 25.30mm;

[0066] 9.60mm < f5 < 13.40mm;

[0067] -16.80mm < f6 < -11.25mm;

[0068] 86.70 < f7 < 155.35 mm;

[0069] Wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. By rationally controlling the effective focal length of each lens in the optical system, the forward-looking intelligent driving optical system can meet the imaging range requirements while limiting the effective diameter of components, controlling the overall size of the optical system, and adjusting the incident angle of light, which is beneficial for correcting system aberrations.

[0070] Furthermore, the optical system satisfies the following conditions:

[0071] -5.0 < f1 / f < -1.0;

[0072] -18.0 < f2 / f < -11.2;

[0073] 1.7 < f3 / f < 3.4;

[0074] 2.0 < f4 / f < 3.1;

[0075] 1.2 < f5 / f < 1.9;

[0076] -2.1 < f6 / f < -0.8;

[0077] 10.7 < f7 / f < 19.3;

[0078] Where f represents the focal length of the entire optical system, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. By limiting the ratio of the effective focal length of each lens to the effective focal length of the optical system, the optical system obtains a reasonable light deflection angle, effectively reducing component tolerance sensitivity and improving system aberrations.

[0079] Furthermore, the optical system satisfies the following condition: (dn / dt)² < -1.6 * 10⁻⁶ -06 / ℃; where (dn / dt)2 is the refractive index temperature coefficient of the second lens. By reasonably setting the second lens to have a negative refractive index temperature coefficient, the temperature performance is effectively improved.

[0080] Furthermore, the optical system satisfies the following conditions: Nd2 < 1.65; Vd2 > 60.0; where Nd2 is the refractive index of the second lens material and Vd2 is the Abbe number of the second lens material. By appropriately selecting the refractive index and Abbe number of the lens material, the light can be made smoother, effectively reducing primary aberrations and various higher-order aberrations generated by the optical system.

[0081] Furthermore, the optical system satisfies the following conditions: -1.13 < f5 / f6 < -0.65; 2.95 < Vd5 / Vd6 < 4.13; where f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, Vd5 is the Abbe number of the fifth lens, and Vd6 is the Abbe number of the sixth lens. The limited effective focal length ratio of the fifth and sixth lenses effectively corrects the astigmatism of the system, thereby ensuring image quality at the edges of the field of view. Simultaneously, a reasonable combination of material Abbe numbers can further reduce axial and transverse chromatic aberration, improving the system's imaging quality.

[0082] Furthermore, the optical system satisfies the following condition: f56 / f4 < 2.450; where f56 is the effective focal length of the bonded lens and f4 is the effective focal length of the fourth lens. The fifth and sixth lenses constitute the bonded lens. By controlling the ratio of the effective focal lengths of the bonded lens and the fourth lens in the optical system, it is beneficial to control the incident light height of the light beam entering the optical system, thereby reducing the higher-order aberrations of the optical system and the outer diameter of the lenses.

[0083] Furthermore, the optical system satisfies the following conditions: |R2 / R3|>1.00; |R12 / R13|>1.125; where R2 is the object-side radius of curvature of the first lens, R3 is the image-side radius of curvature of the second lens, R12 is the image-side radius of curvature of the sixth lens, and R13 is the object-side radius of curvature of the seventh lens. By controlling the curvature radii of curvature of the first and second lenses, as well as the sixth and seventh lenses, the incident angle of the principal rays in each field of view of the optical imaging lens on the image plane can be reasonably controlled, meeting the requirements of the principal ray incident angle in the optical system design and effectively suppressing ghosting.

[0084] Preferably, the optical system meets the following conditions: the full field of view (FOV) of the optical system is [50°, 80°], and the total length of the optical system is 30mm ≤ TTL ≤ 40mm. Through the design of the large field of view of the optical system, the imaging range and distortion requirements of the forward-looking intelligent driving optical system are effectively met.

[0085] Furthermore, the first, second, third, fourth, fifth, and sixth lenses are spherical lenses, and the seventh lens is an aspherical lens. The aperture stop is located between the third and fourth lenses, or between the fourth and fifth lenses. The reasonable combination of lens shape and optical power effectively meets the design requirements of ultra-wide-angle and miniaturization of the optical system.

[0086] Example 1:

[0087] Specifically, as a preferred embodiment of the present invention and not a limitation thereof, the following references are made. Figures 1 to 2 Describes an optical imaging lens according to Embodiment 1 of this application. Figure 1 A schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application is shown.

[0088] like Figure 1 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 third lens E3, a fourth lens E4, a STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0089] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S10 being convex and its image-side surface S11 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17.

[0090] 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).

[0091] Table 1: Basic parameters of the optical system in Example 1

[0092] Face number Surface type Radius of curvature (mm) Thickness (mm) Material OBJ spherical endless endless S1 spherical -55.901 1.200 1.69,55.53 S2 spherical 7.262 4.100 S3 spherical -6.331 2.140 1.49,70.44 S4 spherical -7.767 0.100 S5 spherical 18.113 2.110 2.00,25.43 S6 spherical 68.921 3.600 S7 spherical 27.528 2.700 1.59,66.99 S8 spherical -22.313 0.100 STO flat endless 0.000 S10 spherical 13.374 4.540 1.62,63.36 S11 spherical -11.580 3.540 1.95,17.94 S12 spherical -77.726 5.620 S13 aspherical 27.082 3.110 1.69,31.18 S14 aspherical 35.564 1.200 S15 flat endless 1.000 1.52,64.20 S16 flat endless 1.640 S17 flat endless /

[0093] In Table 1, both the object-side surface S13 and the image-side surface S14 of the seventh lens E7 are aspherical surfaces, and their surface shapes can be defined using, but are not limited to, the following aspherical surface formulas:

[0094]

[0095] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 2 gives the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for each aspherical surface that can be used in the first embodiment.

[0096] Table 2: Aspherical correlation values ​​of the lens surface in Example 1

[0097]

[0098] Example 2:

[0099] Specifically, as a preferred embodiment of the present invention and not a limitation thereof, the following references are made. Figures 3 to 4 Describes an optical imaging lens according to Embodiment 2 of this application. Figure 3 A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown.

[0100] like Figure 3 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 third lens E3, a STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0101] The first lens has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S8 being convex and its image-side surface S9 being convex. The fifth lens E5 has positive optical power, with its object-side surface S10 being convex and its image-side surface S11 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17.

[0102] Table 3 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).

[0103] Table 3: Basic parameters of the optical system in Example 2

[0104] Face number Surface type Radius of curvature (mm) Thickness (mm) Material OBJ flat endless endless S1 spherical -102.016 1.101 1.70,55.53 S2 spherical 7.204 4.170 S3 spherical -6.878 3.457 1.49,70.44 S4 spherical -9.076 0.036 S5 spherical 16.330 2.656 1.91,35.25 S6 spherical 2275.332 2.202 STO spherical endless 1.104 S8 spherical 18.581 2.787 1.62,63.41 S9 spherical -62.780 0.030 S10 spherical 15.496 4.280 1.57,71.30 S11 spherical -10.529 3.707 1.95,17.94 S12 spherical -60.291 4.124 S13 aspherical 46.179 3.608 1.69,31.18 S14 aspherical 81.328 1.200 S15 flat endless 0.700 1.52,64.20 S16 flat endless 1.853 S17 flat endless /

[0105] In Table 3, the object-side surface S13 and image-side surface S14 of the seventh lens E7 are both aspherical surfaces, and their surface shapes can be defined using, but are not limited to, the following aspherical surface formulas:

[0106]

[0107] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 4 gives the conic coefficients and higher-order term coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical surface in the first embodiment.

[0108] Table 4: Aspherical correlation values ​​of the lens surface in Example 2

[0109]

[0110] Figure 4The field curvature curve and distortion curve of the optical imaging lens of Example 2 are shown. As can be seen from the figure, the optical imaging lens given in Example 2 can achieve good imaging quality.

[0111] Example 3:

[0112] Specifically, see the following references Figures 5 to 6 Describes an optical imaging lens according to Embodiment 3 of this application. Figure 5 A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown.

[0113] like Figure 5 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 third lens E3, a STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0114] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S8 being convex and its image-side surface S9 being convex. The fifth lens E5 has positive optical power, with its object-side surface S10 being convex and its image-side surface S11 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17.

[0115] Table 5 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).

[0116] Table 5: Basic parameters of the optical system in Example 3

[0117] Face number Surface type Radius of curvature (mm) Thickness (mm) Material OBJ flat endless endless S1 spherical -63.956 1.216 1.70,55.53 S2 spherical 7.125 3.920 S3 spherical -6.867 2.964 1.49,70.44 S4 spherical -9.160 0.086 S5 spherical 17.610 2.743 2.00,29.13 S6 spherical 131.895 2.547 STO flat endless -0.0015 S8 spherical 28.990 2.888 1.62,,63.41 S9 spherical -27.174 0.095 S10 spherical 14.218 4.723 1.62,63.41 S11 spherical -10.376 3.761 1.95,17.94 S12 spherical -69.078 5.067 S13 aspherical 35.151 3.083 1.69,31.18 S14 aspherical 74.845 1.500 S15 flat endless 0.800 1.52,64.20 S16 flat endless 1.620 S17 flat endless /

[0118] In Table 5, the object-side surface S13 and image-side surface S14 of the seventh lens E7 are both aspherical surfaces, and their surface shapes can be defined using, but are not limited to, the following aspherical surface formulas:

[0119]

[0120] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 6 gives the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for each aspherical surface that can be used in the first embodiment.

[0121] Table 6: Aspherical Correlation Values ​​of Lens Surface in Example 3

[0122]

[0123] Figure 6 The field curvature curve and distortion curve of the optical imaging lens of Example 3 are shown. As can be seen from the figure, the optical imaging lens given in Example 3 can achieve good imaging quality.

[0124] In Examples 1-3, the basic data is shown in Table 7:

[0125] Table 7 Basic Data for Examples 1-3

[0126] Basic data Example 1 Example 2 Example 3 f(mm) 7.91 7.93 7.94 f1(mm) -9.12 -9.58 -9.10 f2 (mm) -137.15 -120.09 -97.42 f3 (mm) 23.85 17.94 19.92 f4 (mm) 21.13 23.43 23.07 f5 (mm) 10.76 11.68 10.44 f6 (mm) -14.60 -13.83 -13.17 f7 (mm) 142.70 148.19 92.84 f56(mm) 31.96 55.58 37.10 TTL(mm) 36.70 37.01 37.01 Fno 1.60 1.60 1.60 FOV (°) 70.12 70.12 70.12

[0127] In Examples 1-3, the conditional expressions satisfy the following Table 8:

[0128] Table 8 Conditional expressions for Examples 1-3

[0129] Conditional expression Example 1 Example 2 Example 3 D1 10.97 11.62 11.45 Ymax 4.72 4.76 4.72 D1 / (Fno*Ymax) 0.098 0.104 0.102 R2 7.26 7.20 7.12 R3 -6.33 -6.88 -6.87 R12 -77.73 -60.29 -69.08 R13 27.08 46.18 35.15 Nd2 1.49 1.48 1.49 Vd2 70.44 70.44 70.44 Vd5 63.36 71.30 63.41 Vd6 17.94 17.94 17.94 f1 / f -1.153 -1.208 -1.146 f2 / f -17.335 -15.144 -12.270 f3 / f 3.015 2.262 2.509 f4 / f 2.671 2.955 2.906 f5 / f 1.360 1.473 1.315 f6 / f -1.845 -1.444 -1.659 f7 / f 18.040 18.687 11.695 |R2 / R3| 1.147 1.047 1.036 |R12 / R13| 2.870 1.306 1.965 Vd5 / Vd6 3.532 3.974 3.535 f56 / f4 1.513 2.372 1.608 f5 / f6 -0.737 -0.845 -0.793

[0130] A camera module includes at least an optical lens, within which a high-pixel, large-target front-view optical system is installed. The optical system consists of seven lenses. Through the reasonable combination of the shape and optical power of each lens, it has the design advantages of stable performance, high pixel count, large target area, no heat generation, and no ghosting. It effectively meets the imaging range and distortion requirements of the front-view intelligent driving optical system and improves the imaging effect of the equipment paired with the system.

[0131] 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 high-pixel, large-target front-view optical system, comprising, along the optical axis from the object plane to the image plane, 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 negative optical power, and its object side is concave, and its image side is concave; The second lens has negative optical power, with its object side being concave and its image side being convex. The third lens has positive optical power, and its object side is convex, while its image side is concave or flat. The fourth lens has positive optical power, and its object side is convex, as is its image side; The fifth lens has positive optical power, and its object side is convex, and its image side is convex. The sixth lens has negative optical power, and its object side is concave while its image side is convex. The fifth lens and the sixth lens form a bonded lens, and its optical power is positive. The seventh lens has positive optical power, and its object side is convex while its image side is concave. The optical system satisfies the following condition: D1 / (Fno*Ymax) < 0.144; Where D1 is the maximum effective optical diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system.

2. The high-pixel large target front-view optical system according to claim 1, characterized in that, The optical system satisfies the following conditions: -10.68mm < f1 < -8.72mm; -150.37mm < f2 < -88.40mm; 15.50mm < f3 < 25.00mm; 20.05mm < f4 < 25.30mm; 9.60mm < f5 < 13.40mm; -16.80mm < f6 < -11.25mm; 86.70 < f7 < 155.35 mm; Where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

3. The high-pixel large target front-view optical system according to claim 1, characterized in that, The optical system satisfies the following conditions: -5.0 < f1 / f < -1.0; -18.0 < f2 / f < -11.2; 1.7 < f3 / f < 3.4; 2.0 < f4 / f < 3.1; 1.2 < f5 / f < 1.9; -2.1 < f6 / f < -0.8; 10.7 < f7 / f < 19.3; Where f is the focal length of the entire optical system, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

4. The high-pixel large target frontal optical system according to any one of claims 1-3, characterized in that, The optical system satisfies the following conditions: (dn / dt)2<-1.6*10 -06 / ℃; Nd2 < 1.65; Vd2 > 60.0; Where (dn / dt)2 is the temperature coefficient of refractive index of the second lens, Nd2 is the refractive index of the second lens material, and Vd2 is the Abbe number of the second lens material.

5. The high-pixel large target frontal optical system according to any one of claims 1-3, characterized in that, The optical system satisfies the following conditions: -1.13 < f5 / f6 < -0.65; 2.95 < Vd5 / Vd6 < 4.13; Where f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, Vd5 is the Abbe number of the fifth lens, and Vd6 is the Abbe number of the sixth lens.

6. The high-pixel large target frontal optical system according to any one of claims 1-3, characterized in that, The optical system satisfies the following condition: f56 / f4 < 2.450; Where f56 is the effective focal length of the bonded lens, and f4 is the effective focal length of the fourth lens.

7. The high-pixel large target front-view optical system according to claim 1, characterized in that, The optical system satisfies the following conditions: |R2 / R3|>1.00; |R12 / R13|>1.125; Wherein, R2 is the radius of curvature of the object side of the first lens, R3 is the radius of curvature of the image side of the second lens, R12 is the radius of curvature of the image side of the sixth lens, and R13 is the radius of curvature of the object side of the seventh lens.

8. The high-pixel large target frontal optical system according to any one of claims 1-3, characterized in that, The optical system satisfies the following conditions: the full field of view (FOV) of the optical system is ∈ [50°, 80°], and the total length of the optical system is 30mm ≤ TTL ≤ 40mm.

9. The high-pixel large target frontal optical system according to any one of claims 1-3, characterized in that, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are spherical lenses, and the seventh lens is an aspherical lens; The aperture stop is located between the third and fourth lenses, or between the fourth and fifth lenses.

10. A camera module, comprising at least an optical lens, characterized in that, The optical lens is equipped with the high-pixel large target front-view optical system as described in any one of claims 1-9.

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