Large-aperture high-definition optical system and camera module applied by same

Abstract

The utility model provides a large-aperture high-definition optical system and a camera module using the same, mainly comprising six lenses, the object plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is negative; the object plane side of the second lens is a concave surface, the image plane side is a convex surface, and the focal power is negative; the object plane side and the image plane side of the third lens are convex surfaces, and the focal power of the third lens is positive; the object plane side and the image plane side of the fourth lens are convex surfaces, and the focal power of the fourth lens is positive; the object plane side of the fifth lens is a concave surface, and the focal power of the fifth lens is negative; the object plane side of the sixth lens is a convex surface, the focal power of the sixth lens is positive, the number of the lenses is reasonable, the structure is simple, the imaging quality of an optical system is improved through reasonable distribution of the focal power of the lenses and optimization of lens aberration, the characteristics of large aperture, high resolution, excellent temperature characteristic, small size and short total length are considered, and the lens has greater competitiveness in the vehicle-mounted or security protection field.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging, in particular to a large-aperture high-definition optical system and a camera module using the same. BACKGROUND

[0002] With the progress of science and technology and the development of social economy, camera lenses are widely used in vehicle-mounted or security fields, but camera lenses or optical systems often have the disadvantages of high cost, poor imaging quality, low pixels, narrow visual range, and small light quantity. CONTENT OF THE INVENTION

[0003] In order to overcome the disadvantages of small light quantity and low resolution of the existing optical lens, the present application provides a large-aperture, high-definition resolution, excellent temperature characteristic, high-pixel optical system and a camera module using the same, which has the characteristics of large aperture, high-definition resolution, excellent temperature characteristic, small size and short total length, and has greater competitiveness in vehicle-mounted or security fields.

[0004] A large-aperture high-definition optical system, which comprises, in order 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, and a sixth lens.

[0005] The object plane side of the first lens is convex, and the image plane side is concave, and the optical power thereof is negative.

[0006] The object plane side of the second lens is concave, and the image plane side is convex, and the optical power thereof is negative.

[0007] The object plane side and the image plane side of the third lens are both convex, and the optical power thereof is positive.

[0008] The object plane side and the image plane side of the fourth lens are both convex, and the optical power thereof is positive.

[0009] The object plane side of the fifth lens is concave, and the image plane side is convex or concave, and the optical power thereof is negative.

[0010] The object plane side of the sixth lens is convex, and the image plane side is convex or concave, and the optical power thereof is positive.

[0011] Preferably, each lens of the optical system satisfies the following conditions:

[0012] -5.50mm < f1 < -3.50mm;

[0013] -10.5mm < f2 < -9.0mm;

[0014] 3.7mm < f3 < 5.2mm;

[0015] 2.8mm < f4 < 3.9mm;

[0016] -4.7mm < f5 < -4.1mm;

[0017] 7.5mm < f6 < 15mm;

[0018] wherein, 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, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

[0019] Preferably, the radius of curvature R of the object side and image side of the second lens satisfies: R < 0.

[0020] Preferably, the optical system satisfies the following condition: TTL ≤ 15.1mm;

[0021] wherein, TTL is the on-axis distance from the object side of the first lens to the image plane.

[0022] Preferably, the material refractive index Nd1 and the material Abbe number constant Vd1 of the first lens satisfy: 1.53 < Nd1 < 1.73, 55.00 < Vd1 < 65.00;

[0023] the material refractive index Nd2 and the material Abbe number constant Vd2 of the second lens satisfy: 1.51 < Nd2 < 1.62, 50 < Vd2 < 57;

[0024] the material refractive index Nd3 and the material Abbe number constant Vd3 of the third lens satisfy: 1.9 < Nd3 < 2, 25.00 < Vd3 < 37.00;

[0025] the material refractive index Nd4 and the material Abbe number constant Vd4 of the fourth lens satisfy: 1.51 < Nd4 < 1.62, 50 < Vd4 < 57;

[0026] the material refractive index Nd5 and the material Abbe number constant Vd5 of the fifth lens satisfy: 1.62 < Nd5 < 1.69, 19 < Vd5 < 21;

[0027] the material refractive index Nd6 and the material Abbe number constant Vd6 of the sixth lens satisfy: 1.51 < Nd6 < 1.62, 50 < Vd6 < 57.

[0028] Preferably, the first lens and the third lens are spherical lenses, and the second lens, the fourth lens, the fifth lens and the sixth lens are aspherical lenses.

[0029] Preferably, the full field of view FOV of the optical system satisfies: 130° ≤ FOV.

[0030] Preferably, the fourth lens and the fifth lens constitute a cemented lens.

[0031] Preferably, the F number of the optical system is: 1.7 ≤ F number ≤ 1.9.

[0032] Preferably, the stop of the optical system is located between the third lens and the fourth lens.

[0033] In another aspect, the application also provides a camera lens, wherein the camera lens is internally installed with the optical system.

[0034] Compared with the prior art, the application has the following beneficial effects:

[0035] The utility model provides a big aperture, high definition's resolution, temperature characteristic is excellent, high pixel's optical system and its application's camera module, mainly by 6 lenses constitute, give consideration to big aperture, high definition's resolution, temperature characteristic is excellent, small volume short total length's characteristics, have greater competitiveness in vehicle-mounted or security field. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical scheme in the embodiment of the application, the drawings needed in the embodiment description will be briefly introduced as follows.

[0037] Figure 1 It is the structural schematic diagram of optical system or camera module of embodiment 1 of the application;

[0038] Figure 2 It is astigmatism and distortion curve diagram of optical system or camera module of embodiment 1 of the application;

[0039] Figure 3 It is MTF curve diagram of optical system or camera module of embodiment 1 of the application;

[0040] Figure 4 It is the structural schematic diagram of optical system or camera module of embodiment 2 of the application;

[0041] Figure 5 It is astigmatism and distortion curve diagram of optical system or camera module of embodiment 2 of the application;

[0042] Figure 6 It is MTF curve diagram of optical system or camera module of embodiment 2 of the application;

[0043] Figure 7 It is the structural schematic diagram of optical system or camera module of embodiment 3 of the application;

[0044] Figure 8 It is astigmatism and distortion curve diagram of optical system or camera module of embodiment 3 of the application;

[0045] Figure 9 It is MTF curve diagram of optical system or camera module of embodiment 3 of the application. DETAILED DESCRIPTION

[0046] As Figures 1-9 The optical system comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a diaphragm 7, a sixth lens 6 and an infrared filter 8.

[0047] The object side of the first lens is a convex surface, the image side is a concave surface, and the focal power is negative;

[0048] The object side of the second lens is a concave surface, the image side is a convex surface, and the focal power is negative;

[0049] The object side and the image side of the third lens are both convex surfaces, and the focal power is positive;

[0050] The object side and the image side of the fourth lens are both convex surfaces, and the focal power is positive;

[0051] The object side of the fifth lens is a concave surface, the image side is a convex or concave surface, and the focal power is negative;

[0052] The object side of the sixth lens is a convex surface, the image side is a convex or concave surface, and the focal power is positive;

[0053] The utility model provides a kind of optical system and the camera module of application thereof, it is mainly composed of 6 lenses, the object side of first lens is convex surface, the image side is concave surface, and the focal power is negative;The object side of second lens is concave surface, the image side is convex surface, and the focal power is negative;The object side and the image side of third lens are both convex surfaces, and the focal power is positive;The object side and the image side of fourth lens are both convex surfaces, and the focal power is positive;The object side of fifth lens is concave surface, the image side is convex or concave surface, and the focal power is negative;The object side of sixth lens is convex surface, the image side is convex or concave surface, and the focal power is positive, reasonable in number of lens, simple structure, by reasonable distribution lens focal power, optimization lens aberration, improve the imaging quality of optical system, give consideration to large aperture, the resolution of high definition, temperature characteristic is excellent, small volume short total length The characteristics of feature, in vehicle-mounted or security field has greater competitiveness.

[0054] Further, as a preferred embodiment of the utility model but not limited, each lens of the optical system meets the following conditions, wherein 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, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens:

[0055] (1) -5.50mm < f1 < -3.50 mm, by constraining the effective focal length of the first lens E1 in reasonable range, control the distortion of system, make imaging center have higher angular resolution;

[0056] (2) -10.5 mm < f2 < -9.0 mm, by restricting the effective focal length of the second lens E2 in a reasonable range, so that the configured optical system has excellent temperature characteristics, thereby improving the stability of the optical system imaging at high and low temperatures, and improving the imaging quality;

[0057] (3) 3.7 mm < f3 < 5.2 mm, by restricting the effective focal length of the third lens E3 in a reasonable range, the spherical aberration of the system is fine-tuned and controlled, thereby effectively improving the imaging quality of the system;

[0058] (4) 2.8 mm < f4 < 3.9 mm, by reasonably controlling the effective focal length of the fourth lens E4 in a reasonable range, the astigmatism and field curvature of the system are well corrected, and the imaging quality of the system is effectively improved;

[0059] (5) -4.7 mm < f5 < -4.1 mm, by restricting the effective focal length of the fifth lens E5 in a reasonable range, so that the configured optical system has excellent temperature characteristics, thereby improving the stability of the optical system imaging at high and low temperatures, and improving the imaging quality;

[0060] (6) 7.5 mm < f6 < 15 mm, by restricting the effective focal length of the sixth lens E6 in a reasonable range, the lens aberration is optimized, and the resolution performance is improved.

[0061] Preferably, the material refractive index Nd1 and the material Abbe number Vd1 of the first lens E1 satisfy: 1.53 < Nd1 < 1.73, 55.00 < Vd1 < 65.00, which can effectively reduce chromatic aberration, optimize lens aberration, and thereby effectively improve the imaging quality of the system;

[0062] Preferably, the material refractive index Nd2 and the material Abbe number Vd2 of the second lens E2 satisfy: 1.51 < Nd2 < 1.62, 50 < Vd2 < 57, which can ensure good optical performance, further ensure the viewing angle, improve the resolution of the lens, and adjust the distortion of the lens;

[0063] Preferably, the material refractive index Nd3 and the material Abbe number Vd3 of the third lens E3 satisfy: 1.9 < Nd3 < 2, 25.00 < Vd3 < 37.00, which can effectively reduce chromatic aberration, optimize lens aberration, and thereby effectively improve the imaging quality of the system;

[0064] Preferably, the material refractive index Nd4 and the material Abbe number Vd4 of the fourth lens E4 satisfy: 1.51 < Nd4 < 1.62, 50 < Vd4 < 57, which can ensure good optical performance, further ensure the viewing angle, improve the resolution of the lens, and reduce the distortion;

[0065] Preferably, the material refractive index Nd5 and the material Abbe number Vd5 of the fifth lens E5 satisfy: 1.62 < Nd5 < 1.69, 19 < Vd5 < 21, which can effectively reduce chromatic aberration, optimize lens aberration, and effectively improve the imaging quality of the system.

[0066] Preferably, the material refractive index Nd6 and the material Abbe number Vd6 of the sixth lens E6 satisfy: 1.51 < Nd6 < 1.62, 50 < Vd6 < 57, which can ensure good optical performance, further ensure the viewing angle, improve the resolution of the lens, and reduce distortion.

[0067] Further, as a preferred embodiment of the utility model but not limited, the curvature radius R of the second lens object plane and image plane side satisfies: R < 0, by controlling the R value of the second lens object plane and image plane side, the field curvature can be effectively corrected, and the imaging quality of the system is improved.

[0068] Further, as a preferred embodiment of the utility model but not limited, the total optical length TTL of the optical system satisfies: TTL < 15.1 mm, which can make the entire optical system integrated in a small range, and is beneficial to the miniaturization of the optical system.

[0069] Further, as a preferred embodiment of the utility model but not limited, the first lens and the third lens are spherical lenses, and the second lens, the fourth lens, the fifth lens, and the sixth lens are aspherical lenses, which can improve the performance at high and low temperatures and at room temperature.

[0070] Further, as a preferred embodiment of the utility model but not limited, the full field of view FOV of the optical system satisfies: 130° < FOV, which meets the application requirements of customers.

[0071] Further, as a preferred embodiment of the utility model but not limited, the fourth lens and the fifth lens constitute a cemented lens, which increases the difference between the refractive index and the Abbe number of the lens, and can effectively reduce chromatic aberration.

[0072] Further, as a preferred embodiment of the utility model but not limited, the F number and FOV of the optical system satisfy: 1.7 < F number < 1.9, and the large aperture configuration can increase the light amount of the optical system and improve the imaging quality.

[0073] Further, as a preferred embodiment of the utility model but not limited, the diaphragm of the optical system is located between the fourth lens and the fifth lens, which effectively improves the aberration of the system.

[0074] Specifically, as a preferred embodiment of the utility model but not limited, as shown in Figures 1-3As shown in the embodiment 1, the focal length f1 of the first lens 1 is -4.66 mm, the focal length f2 of the second lens 2 is -9.34 mm, the focal length f3 of the third lens 3 is 4.57 mm, the focal length f4 of the fourth lens 4 is 3.7 mm, the focal length f5 of the fifth lens 5 is -4.37 mm, the focal length f6 of the sixth lens 6 is 8.59 mm, the total optical length TTL is 15 mm, and the surface type, the radius of curvature, the thickness and the material parameters of each lens are shown in Table 1:

[0075] Table 1: Basic parameters of the optical system in embodiment 1

[0076]

[0077] In Table 1, along the optical axis from the object plane to the image plane, OBJ is the object plane; S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S5 and S6 correspond to the two surfaces of the third lens 3; S8 and S9 correspond to the two surfaces of the fourth lens 4; S9 and S10 correspond to the two surfaces of the fifth lens 5; S11 and S12 correspond to the two surfaces of the sixth lens 6; STO is the position of the stop; S13 and S14 correspond to the two surfaces of the filter; S15 and S16 correspond to the two surfaces of the chip protection glass; and IMA corresponds to the image plane.

[0078] Further, in Table 1, the object side surface and the image side surface of each of the second lens 2, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0079]

[0080] wherein 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 high-order term in the aspherical surface formula. Table 2 shows the conic coefficient and the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspherical surface that can be used in the embodiment 1.

[0081] Table 2: Aspherical surface related values of the lens surface in embodiment 1

[0082]

[0083] Figure 2 The astigmatism and distortion curves of the optical imaging lens in embodiment 1 are shown, wherein the astigmatism represents the meridional image surface curvature and the sagittal image surface curvature, and the distortion represents the distortion size value corresponding to different image heights; Figure 3The MTF curve of the optical imaging lens of embodiment 1 is shown, which represents the MTF values of different field of view meridian direction and sagittal direction at different spatial frequencies, which are obtained by Figure 2 and Figure 3 It can be seen that the optical imaging system given by embodiment 1 can achieve good imaging quality and has higher imaging quality.

[0084] Specifically, as a preferred embodiment of the utility model but not limited, as shown in the embodiment 2, the focal length f1 of the first lens 1 is -4.46 mm, the focal length f2 of the second lens 2 is -9.46 mm, the focal length f3 of the third lens 3 is 4.69 mm, the focal length f4 of the fourth lens 4 is 3.29 mm, the focal length f5 of the fifth lens 5 is -4.69 mm, the focal length f6 of the sixth lens 6 is 13.24 mm, the total length of the optical system TTL is 15 mm, and the surface type, curvature radius, thickness and material parameters of each lens are shown in table 3: Figures 4-6

[0085] Table 3: basic parameters of the optical system of embodiment 2

[0086]

[0087] In table 3, along the optical axis from the object plane to the image plane, OBJ is the object plane; S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S5 and S6 correspond to the two surfaces of the third lens 3; S8 and S9 correspond to the two surfaces of the fourth lens 4; S9 and S10 correspond to the two surfaces of the fifth lens 5; S11 and S12 correspond to the two surfaces of the sixth lens 6; STO is the position of the stop; S13 and S14 correspond to the two surfaces of the filter; S15 and S16 correspond to the two surfaces of the chip protection glass; and IMA corresponds to the image plane.

[0088] Further, in table 3, the object side surface and the image side surface of any one of the second lens 2, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are aspherical surfaces, and the surface type of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0089]

[0090] Wherein, x is the distance from the corresponding point on the aspherical surface to the plane tangent to the surface vertex, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the aspherical surface vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface formula. Table 4 gives the conic coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of the aspherical surfaces that can be used in embodiment 2. ​

[0091] Table 4: Aspherical related numerical values of the lens surface of Example 2

[0092]

[0093] Figure 5 The astigmatism and distortion curves of the optical imaging lens of Example 2 are shown, the astigmatism represents the meridional image surface bending and sagittal image surface bending, and the distortion represents the distortion size value corresponding to different image heights; Figure 6 The MTF curve of the optical imaging lens of Example 2 is shown, which represents the MTF values of the meridional direction and the sagittal direction of different fields of view under different spatial frequencies, which are obtained by Figure 5 and Figure 6 It can be seen that the optical imaging system given by Example 2 can achieve good imaging quality and has higher imaging quality.

[0094] Specifically, as a preferred embodiment of the utility model but not limited, as shown in Figures 7-9 In this embodiment 3, the focal length f1 of the first lens 1 is -4.44 mm, the focal length f2 of the second lens 2 is -9.30 mm, the focal length f3 of the third lens 3 is 4.57 mm, the focal length f4 of the fourth lens 4 is 3.23 mm, the focal length f5 of the fifth lens 5 is -4.50 mm, the focal length f6 of the sixth lens 6 is 12.97 mm, the total optical length TTL is 15 mm, and the surface type, curvature radius, thickness and material parameters of each lens are shown in Table 5:

[0095] Table 5: Basic parameters of the optical system of Example 3

[0096]

[0097] In Table 5 above, along the optical axis from the object plane to the image plane, OBJ is the object plane; S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S5 and S6 correspond to the two surfaces of the third lens 3; S8 and S9 correspond to the two surfaces of the fourth lens 4; S9 and S10 correspond to the two surfaces of the fifth lens 5; S11 and S12 correspond to the two surfaces of the sixth lens 6; STO is the position of the stop; S13 and S14 correspond to the two surfaces of the filter; S15 and S16 correspond to the two surfaces of the chip protection glass; IMA corresponds to the image plane.

[0098] Further, in Table 5, the object side surface and the image side surface of any one of the second lens 2, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are aspherical surfaces, and the surface type of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0099]

[0100] wherein x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the vertex of the aspheric surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high order term in the aspheric surface formula. Table 6 shows the conic coefficients and high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of the aspheric surfaces used in Example 3.

[0101] Table 6: Aspheric surface related values of the lens surface of Example 3

[0102]

[0103] Figure 8 The astigmatism and distortion curves of the optical imaging lens of Example 3 are shown, wherein the astigmatism represents the meridional image surface curvature and sagittal image surface curvature, and the distortion represents the distortion size values corresponding to different image heights; Figure 9 The MTF curves of the optical imaging lens of Example 3 are shown, which represent the meridional and sagittal direction MTF values of different fields of view at different spatial frequencies, and the MTF curves are shown in Figure 8. Figure 8 and Figure 9 It can be seen that the optical imaging system of Example 3 can achieve good imaging quality and has higher imaging quality.

[0104] Further, in Examples 1-3, the basic data are as follows:

[0105] Table 7: Basic data of Examples 1-3

[0106]

[0107] A camera module at least includes an optical lens, and the optical lens is installed with the optical system described above. The camera lens of the embodiment mainly consists of six lenses. The number of lenses is reasonable, the structure is simple, the lens power is reasonably distributed, the lens aberration is optimized, the imaging quality of the optical system is improved, the large aperture, high resolution, excellent temperature characteristics, small size and short total length are considered, and the camera lens has greater competitiveness in the vehicle-mounted or security field.

[0108] The above is one or more embodiments provided in combination with specific content, and it is not intended that the specific implementation of the utility model is limited to these descriptions. Any approximation, similarity or replacement of the method and structure of the utility model, or any technical deduction or replacement under the concept of the utility model, should be considered as the protection scope of the utility model.

Claims

1. A large-aperture high-definition optical system, comprising, in sequence 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, and a sixth lens, characterized in that: The object side of the first lens is convex, and the image side is concave; its optical power is negative. The object side of the second lens is concave, and the image side is convex, and its optical power is negative. The object side and image side of the third lens are both convex, and its optical power is positive. The fourth lens has convex surfaces on both the object plane and image plane sides, and its optical power is positive. The object side of the fifth lens is concave, and its optical power is negative. The object plane of the sixth lens is convex, and its optical power is positive. Each lens in this optical system satisfies the following condition: -5.50mm < f1 < -3.50mm; -10.5mm < f2 < -9.0mm; 3.7mm < f3 < 5.2mm; 2.8mm < f4 < 3.9mm; -4.7mm < f5 < -4.1mm; 7.5mm < f6 < 15mm; 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, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

2. The large-aperture high-definition optical system according to claim 1, characterized in that: The radii of curvature R of the object plane and image plane sides of the second lens both satisfy: R < 0.

3. The large-aperture high-definition optical system according to claim 1, characterized in that: The optical system meets the following condition: TTL ≤ 15.1mm; Where TTL is the on-axis distance from the object side of the first lens to the imaging plane.

4. The large-aperture high-definition optical system according to any one of claims 1-3, characterized in that: The refractive index Nd1 and Abbe number Vd1 of the material of the first lens satisfy: 1.53 < Nd1 < 1.73, 55.00 < Vd1 < 65.00; The refractive index Nd2 and Abbe number Vd2 of the material of the second lens satisfy: 1.51 < Nd2 < 1.62, 50 < Vd2 < 57; The refractive index Nd3 and Abbe number Vd3 of the material of the third lens satisfy the following conditions: 1.9 < Nd3 < 2, 25.00 < Vd3 < 37.00; The refractive index Nd4 and Abbe number constant Vd4 of the fourth lens satisfy the following conditions: 1.51 < Nd4 < 1.62, 50 < Vd4 < 57; The refractive index Nd5 and Abbe number Vd5 of the fifth lens satisfy the following conditions: 1.62 < Nd5 < 1.69, 19 < Vd5 < 21; The refractive index Nd6 and Abbe number Vd6 of the material of the sixth lens satisfy the following conditions: 1.51 < Nd6 < 1.62, 50 < Vd6 < 57.

5. The large-aperture high-definition optical system according to any one of claims 1-3, characterized in that: The first and third lenses are spherical lenses, while the second, fourth, fifth, and sixth lenses are aspherical lenses.

6. The large-aperture high-definition optical system according to any one of claims 1-3, characterized in that: The field of view (FOV) of this optical system satisfies: 130° ≤ FOV.

7. The large-aperture high-definition optical system according to any one of claims 1-3, characterized in that: The fourth lens and the fifth lens form a cemented lens.

8. The large-aperture high-definition optical system according to any one of claims 1-3, characterized in that: The F-number of this optical system is: 1.7 ≤ F-number ≤ 1.

9.

9. The large-aperture high-definition optical system according to any one of claims 1-3, characterized in that: The aperture of the optical system is located between the third lens and the fourth lens.

10. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with a large-aperture high-definition optical system as described in any one of claims 1-9.

Images