An ultra-wide-angle high-definition optical system and a camera module using the same

Abstract

This invention provides an ultra-wide-angle high-definition optical system and its camera module, mainly composed of six lenses. The first lens has a convex object plane and a concave image plane, with negative optical power. The second lens has a convex object plane and a concave image plane, with negative optical power. The third lens has positive optical power. The fourth lens has either a convex or concave object plane and a convex image plane, with positive optical power. The fifth lens has optical power, and the sixth lens has optical power. 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 also incorporates ultra-wide-angle, high-illuminance, and excellent temperature characteristics, giving it significant market potential.

Description

Technical Field

[0001] This application relates to the field of optical imaging, and more particularly to an ultra-wide-angle high-definition optical system and a camera module for its application. Background Technology

[0002] In recent years, automotive driver assistance systems have developed rapidly, and automotive optical lenses, as the eyes of cars to acquire external information, have played an irreplaceable role. In order to meet higher imaging quality requirements and a wider field of view, lenses need to be properly matched. However, many lenses on the market at present have disadvantages such as small field of view, poor sharpness, large performance degradation at high and low temperatures, and low relative illumination. Summary of the Invention

[0003] To overcome the shortcomings of existing lenses, such as small field of view, poor clarity, large performance degradation at high and low temperatures, and low relative illumination, this application provides an ultra-wide-angle, high-definition, high-performance, high-illuminance optical system and its application camera module, which has great potential in the field of intelligent driving in vehicles.

[0004] An ultra-wide-angle high-definition optical system, consisting of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially along the optical axis from the object plane to the image plane:

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

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

[0007] The third lens has positive optical power;

[0008] The fourth lens has a convex or concave object plane and a convex image plane, and its optical power is positive.

[0009] The fifth lens has optical power;

[0010] The sixth lens has optical power;

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

[0012] -7.0mm < f1 < -6.1mm;

[0013] -5.3 mm < f2 < -2.9 mm;

[0014] 4.5mm < f3 < 10.5mm;

[0015] 3.0mm < f4 < 8.5mm;

[0016] -4.5mm < f5 < 3.5mm;

[0017] -3.7mm < f6 < 5.7mm;

[0018] 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.

[0019] Preferably, each lens of the optical system satisfies the following conditions:

[0020] Nd1 > 1.8, Vd1 < 43;

[0021] Nd2 < 1.55, Vd2 > 55;

[0022] Nd3 > 1.62, Vd3 < 30;

[0023] Nd4 > 1.45, Vd4 < 85;

[0024] Nd5 > 1.53, Vd5 < 56;

[0025] Nd6 > 1.53, Vd6 < 56;

[0026] Wherein, Nd1 is the refractive index of the first lens, and Vd1 is the Abbe number of the first lens; Nd2 is the refractive index of the second lens, and Vd2 is the Abbe number of the second lens; Nd3 is the refractive index of the third lens, and Vd3 is the Abbe number of the third lens; Nd4 is the refractive index of the fourth lens, and Vd4 is the Abbe number of the fourth lens; Nd5 is the refractive index of the fifth lens, and Vd5 is the Abbe number of the fifth lens; Nd6 is the refractive index of the sixth lens, and Vd6 is the Abbe number of the sixth lens.

[0027] Preferably, the relative illuminance of the maximum field of view of the optical system satisfies: RI ≥ 45%.

[0028] Preferably, the radius of curvature R1 of the object surface side of the first lens satisfies: R1 < 13mm.

[0029] Preferably, the radius of curvature R1 of the object surface side of the third lens satisfies: -11mm < R1 < 17mm.

[0030] Preferably, the total optical length (TTL) of the optical system satisfies: TTL ≤ 19 mm.

[0031] Preferably, the third and fourth lenses are made of glass or plastic.

[0032] Preferably, the horizontal field angle (FOV) of the optical system satisfies: FOV≥200°, and the maximum image circle satisfies: MIC≥5.76mm.

[0033] Preferably, the aperture is positioned between the third lens and the fourth lens.

[0034] Preferably, the fifth lens and the sixth lens are bonded together to form a combined lens.

[0035] On the other hand, this application embodiment also provides a camera module, which includes at least an optical lens, and the above-mentioned vehicle-mounted ultra-wide-angle high-definition optical system is installed in the optical lens.

[0036] Compared with the prior art, the beneficial effects of this application are as follows:

[0037] This invention provides an ultra-wide-angle high-definition optical system and its camera module, mainly composed of six lenses. The first lens has a convex object plane and a concave image plane, with negative optical power. The second lens has a convex object plane and a concave image plane, with negative optical power. The third lens has positive optical power. The fourth lens has either a convex or concave object plane and a convex image plane, with positive optical power. The fifth lens has optical power, and the sixth lens has optical power. 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 also incorporates ultra-wide-angle, high-illuminance, and excellent temperature characteristics, giving it significant market potential. Attached Figure Description

[0038] 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.

[0039] Figure 1 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 1 of this application;

[0040] Figure 2 This is a graph showing the astigmatism and distortion of the optical system or camera module in Embodiment 1 of this application;

[0041] Figure 3 This is the MTF curve of the optical system or camera module of Embodiment 1 of this application;

[0042] Figure 4 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 2 of this application;

[0043] Figure 5 This is a graph showing the astigmatism and distortion of the optical system or camera module in Embodiment 2 of this application;

[0044] Figure 6 This is the MTF curve of the optical system or camera module in Embodiment 2 of this application;

[0045] Figure 7 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 3 of this application;

[0046] Figure 8 This is a graph showing the astigmatism and distortion of the optical system or camera module in Embodiment 3 of this application;

[0047] Figure 9 This is the MTF curve of the optical system or camera module in Embodiment 3 of this application. Detailed Implementation

[0048] like Figure 1-9 As shown, this application provides an ultra-wide-angle high-definition optical system, which is composed of a first lens 1, a second lens 2, a third lens 3, an aperture 7, a fourth lens 4, a fifth lens 5, a sixth lens 6, and an infrared filter 8 in sequence along the optical axis from the object plane to the image plane 8.

[0049] The object plane side of the first lens is convex, and the image plane side is concave, and its optical power is negative.

[0050] The object side of the second lens is convex, and the image side is concave; its optical power is negative.

[0051] The third lens has positive optical power;

[0052] The fourth lens has a convex or concave object plane and a convex image plane, and its optical power is positive.

[0053] The fifth lens has optical power;

[0054] The sixth lens has optical power;

[0055] This invention provides an ultra-wide-angle high-definition optical system and its application camera module, mainly composed of six lenses. The first lens has a convex object plane and a concave image plane, with negative optical power. The second lens has a convex object plane and a concave image plane, with negative optical power. The third lens has positive optical power. The fourth lens has either a convex or concave object plane and a convex image plane, with positive optical power. The fifth lens has optical power, and the sixth lens has optical power. 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 also incorporates ultra-wide-angle, high-illuminance, and excellent temperature characteristics, giving it significant market potential.

[0056] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, each lens of the optical system satisfies the following condition, 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:

[0057] -7.0mm < f1 < -6.1mm, this design allows the first lens 1 to have a large negative optical power, which is beneficial to reducing astigmatism and field curvature of the optical system;

[0058] -5.3 mm < f2 < -2.9 mm. By constraining the ratio of the optical power of the second lens 2 to the effective focal length of the optical imaging system within a reasonable range, the spherical aberration of the system can be finely adjusted and controlled, thereby effectively improving the imaging quality of the system.

[0059] With 4.5mm < f3 < 10.5mm, by constraining the ratio of the optical power of the third lens 3 to the effective focal length of the optical imaging system within a reasonable range, the optical system has the advantages of ultra-wide angle, large aperture, small size, and excellent temperature characteristics.

[0060] With 3.0mm < f4 < 8.5mm, by constraining the ratio of the optical power of the fourth lens 4 to the effective focal length of the optical imaging system within a reasonable range, the spherical aberration of the system can be finely adjusted and controlled, thereby effectively improving the imaging quality of the system.

[0061] -4.5mm < f5 < 3.5mm. By constraining the ratio of the optical power of the fifth lens 5 to the effective focal length of the optical imaging system within a reasonable range, the optical system has the advantages of ultra-wide angle, large aperture, small size and excellent temperature characteristics.

[0062] -3.7mm < f6 < 5.7mm. By constraining the ratio of the optical power of the sixth lens to the effective focal length of the optical imaging system within a reasonable range, the configured vehicle surround-view optical system has the advantages of ultra-wide angle, small aperture, high illumination and excellent temperature characteristics. It has a compact structure, is easy to process and install, and the large aperture configuration can increase the amount of light entering the optical system and achieve higher imaging quality.

[0063] Furthermore, the refractive index Nd1 and Abbe number Vd1 of the first lens 1 satisfy: Nd1 > 1.8, Vd1 < 43. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.

[0064] Furthermore, the refractive index Nd2 and Abbe number Vd2 of the second lens 2 satisfy: Nd2 < 1.55, Vd2 > 55. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.

[0065] Furthermore, the refractive index Nd3 and Abbe number Vd3 of the third lens 3 satisfy: Nd3 > 1.62, Vd3 < 30. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.

[0066] Furthermore, the refractive index Nd4 and Abbe number Vd4 of the fourth lens 4 satisfy: Nd4 > 1.45, Vd4 < 85. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.

[0067] Furthermore, the refractive index Nd5 and Abbe number Vd5 of the fifth lens 5 satisfy: Nd5 > 1.53, Vd5 < 56. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.

[0068] Furthermore, the refractive index Nd6 and Abbe number Vd6 of the sixth lens 6 satisfy the following conditions: Nd6 > 1.53, Vd6 < 56. This design can effectively reduce chromatic aberration, optimize lens aberration, and thus effectively improve the imaging quality of the system.

[0069] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the relative illuminance of the maximum field of view of the optical system satisfies: RI ≥ 45%. By controlling the relative illuminance, the brightness of the edge field of view of the lens can be improved.

[0070] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the radius of curvature R1 of the object surface side of the first lens satisfies: R1 < 13mm. By controlling the object surface side of the first lens 1, the total deflection angle of the object surface side of the first lens 1 at the edge field of view can be reasonably controlled within a reasonable range.

[0071] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the third and fourth lenses are glass or plastic lenses, which can effectively improve the focus shift at high and low temperatures.

[0072] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the total optical length TTL of the optical system satisfies: TTL ≤ 19 mm. This design can reduce the total optical length and effectively miniaturize the lens.

[0073] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the horizontal field angle (FOV) of the optical system satisfies: FOV≥200°, and the maximum image circle satisfies: MIC≥5.76mm, which is beneficial for expanding the field of view and meeting the user's needs;

[0074] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the fifth lens and the sixth lens are bonded together to form a combined lens. This design increases the difference between the refractive index and the Abbe number of the lens, which can effectively reduce chromatic aberration.

[0075] Specifically, this is a preferred embodiment of the invention and not a limitation thereof, such as Figure 1-3As shown, in this embodiment 1, the focal length of the first lens 1 is f1 = -6.24mm, the focal length of the second lens 2 is f2 = -3.35mm, the focal length of the third lens 3 is f3 = 5.81mm, the focal length of the fourth lens 4 is f4 = 3.81mm, the focal length of the fifth lens 5 is f5 = -2.89mm, the focal length of the sixth lens 6 is f6 = 3.72mm, and the total optical length TTL is 18.6mm. The surface type, radius of curvature, thickness, and material parameters of each lens are shown in Table 1.

[0076] Table 1: Basic parameters of the optical system in Example 1

[0077]

[0078] In Table 1 above, along the optical axis from the object plane to the image plane 9, 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; S10 and S11 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 location of the aperture stop 7; S13 and S14 correspond to the two surfaces of the filter 8; IMA corresponds to the image plane 9.

[0079] Furthermore, in Table 1, the object-side surface and image-side surface of any one of the second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0080]

[0081] 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 term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical surface in Example 1.

[0082] Table 2: Aspherical correlation values ​​of the lens surface in Example 1

[0083]

[0084] Figure 2 The astigmatism and distortion curves of the optical imaging lens of Example 1 are shown. Astigmatism represents the curvature of the meridional image plane and the curvature of the sagittal image plane, and distortion represents the distortion magnitude value corresponding to different image heights. Figure 3The 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 at different spatial frequencies. Figure 2 and Figure 3 It can be seen that the optical imaging system given in Example 1 can achieve good imaging quality and has higher imaging quality.

[0085] Specifically, this is a preferred embodiment of the invention and not a limitation thereof, such as Figure 4-6 As shown, in this embodiment 2, the focal length of the first lens 1 is f1 = -6.78 mm, the focal length of the second lens 2 is f2 = -4.66 mm, the focal length of the third lens 3 is f3 = 5 mm, the focal length of the fourth lens 4 is f4 = 6.36 mm, the focal length of the fifth lens 5 is f5 = -2.97 mm, the focal length of the sixth lens 6 is f6 = 3.22 mm, and the total optical length TTL = 19 mm. The surface type, radius of curvature, thickness, and material parameters of each lens are shown in Table 3.

[0086] Table 3: Basic parameters of the optical system in Example 2

[0087]

[0088] In Table 3 above, along the optical axis from the object plane to the image plane 9, 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; S10 and S11 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 location of the aperture stop 7; S13 and S14 correspond to the two surfaces of the filter 8; IMA corresponds to the image plane 9.

[0089] Furthermore, in Table 3, the object-side surface and image-side surface of any one of the second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0090]

[0091] 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, A16, A18, and A20 that can be used for each aspherical surface in Example 2.

[0092] Table 4: Aspherical correlation values ​​of the lens surface in Example 2

[0093]

[0094] Figure 5 The astigmatism and distortion curves of the optical imaging lens in Example 2 are shown. Astigmatism represents the curvature of the meridional image plane and the curvature of the sagittal image plane, and distortion represents the magnitude of distortion at different image heights. 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 at different spatial frequencies. Figure 5 and Figure 6 It can be seen that the optical imaging system given in Example 2 can achieve good imaging quality and has higher imaging quality.

[0095] Specifically, this is a preferred embodiment of the invention and not a limitation thereof, such as Figure 7-9 As shown, in this embodiment 3, the focal length of the first lens 1 is f1 = -6.36mm, the focal length of the second lens 2 is f2 = -3.34mm, the focal length of the third lens 3 is f3 = 8.71mm, the focal length of the fourth lens 4 is f4 = 5.09mm, the focal length of the fifth lens 5 is f5 = 2.51mm, and the focal length of the sixth lens 6 is f6 = -3.63mm. The total optical length TTL is 18.5mm. The surface type, radius of curvature, thickness, and material parameters of each lens are shown in Table 5.

[0096] Table 5: Basic parameters of the optical system in Example 3

[0097]

[0098] In Table 5 above, along the optical axis from the object plane to the image plane 9, 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; S10 and S11 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 location of the aperture stop 7; S13 and S14 correspond to the two surfaces of the filter 8; IMA corresponds to the image plane 9.

[0099] Furthermore, in Table 5, the object-side surface and image-side surface of any one of the second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0100]

[0101] 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 term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of each aspherical surface that can be used in Example 3.

[0102] Table 6: Aspherical Correlation Values ​​of Lens Surface in Example 3

[0103]

[0104] Figure 8 The astigmatism and distortion curves of the optical imaging lens in Example 3 are shown. Astigmatism represents the curvature of the meridional image plane and the curvature of the sagittal image plane, and distortion represents the magnitude of distortion at different image heights. 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 at different spatial frequencies. Figure 8 and Figure 9 It can be seen that the optical imaging system given in Example 3 can achieve good imaging quality and has higher imaging quality.

[0105] Furthermore, in Examples 1-3, the basic data is as follows:

[0106] Table 7: Basic Data for Examples 1-3

[0107]

[0108] A camera module includes at least an optical lens, in which the aforementioned ultra-wide-angle high-definition optical system is installed. The vehicle-mounted lens of the present invention has the characteristics of ultra-wide-angle and high-definition resolution and excellent temperature characteristics, making it more competitive among lenses of the same type.

[0109] 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. An ultra-wide-angle high-definition 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, 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 either convex or concave, and the image side is concave; its optical power is negative. The third lens has positive optical power and the image plane side is convex. The fourth lens has a convex or concave object plane and a convex image plane, and its optical power is positive. The fifth lens has optical power; The sixth lens has optical power and its image plane side is convex. The fifth and sixth lenses are bonded together to form a composite lens, and the optical powers of the fifth and sixth lenses are opposite. The horizontal field of view (FOV) of this optical system satisfies: FOV ≥ 200°, and the maximum image circle satisfies: MIC ≥ 5.76 mm; Each lens in this optical system satisfies the following condition: -6.78mm≤f1<-6.1mm; -5.3 mm < f2 ≤ -3.35 mm; 4.5mm < f3 < 10.5mm; 3.81mm≤f4≤6.36mm; -4.5mm < f5 < 3.5mm; -3.7mm < f6 < 5.7mm; Nd1 > 1.8, Vd1 < 43; Nd2 < 1.55, Vd2 > 55; Nd3 > 1.62, Vd3 < 30; Nd4 > 1.45, Vd4 < 85; Nd5 > 1.53, Vd5 < 56; Nd6 > 1.53, Vd6 < 56; 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, f6 is the focal length of the sixth lens, Nd1 is the refractive index of the first lens, Vd1 is the Abbe number of the first lens; Nd2 is the refractive index of the second lens, Vd2 is the Abbe number of the second lens; Nd3 is the refractive index of the third lens, Vd3 is the Abbe number of the third lens; Nd4 is the refractive index of the fourth lens, Vd4 is the Abbe number of the fourth lens; Nd5 is the refractive index of the fifth lens, Vd5 is the Abbe number of the fifth lens; Nd6 is the refractive index of the sixth lens, Vd6 is the Abbe number of the sixth lens.

2. The ultra-wide-angle high-definition optical system according to claim 1, characterized in that: The relative illuminance of the maximum field of view of this optical system satisfies: RI ≥ 45%.

3. The ultra-wide-angle high-definition optical system according to claim 1, characterized in that: The radius of curvature R1 on the object side of the first lens satisfies: R1 < 13mm.

4. The ultra-wide-angle high-definition optical system according to claim 1, characterized in that: The radius of curvature R1 on the object side of the third lens satisfies: -11mm < R1 < 17mm.

5. The ultra-wide-angle high-definition optical system according to claim 1, characterized in that: The total optical length (TTL) of the optical system satisfies: TTL ≤ 19 mm.

6. The ultra-wide-angle high-definition optical system according to claim 1, characterized in that: The third and fourth lenses are made of glass or plastic.

7. The ultra-wide-angle high-definition optical system according to claim 1, characterized in that: The aperture is positioned between the third lens and the fourth lens.

8. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with the ultra-wide-angle high-definition optical system according to any one of claims 1-7.

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