Ultra-wide-angle high-definition optical system and camera module applying same

Abstract

The invention provides an ultra-wide-angle high-definition optical system and a camera module applying the same, the ultra-wide-angle high-definition optical system is mainly composed of six lenses, the object plane side of the first lens is a convex surface, the image plane side of the first lens is a concave surface, and the focal power of the first lens is negative; the object plane side of the second lens is a convex surface, the image plane side is a concave surface, and the focal power is negative; the third lens has positive focal power; the object plane side of the fourth lens is convex or concave, the image plane side of the fourth lens is convex, and the focal power of the fourth lens is positive; the fifth lens has focal power; the sixth lens has focal power. The lens is reasonable in number and simple in structure, the imaging quality of an optical system is improved by reasonably distributing the focal power of the lenses and optimizing the aberration of the lens, the characteristics of ultra-wide angle, high illumination and excellent temperature characteristic are considered, and the wide-angle lens has huge potential in the market.

Description

Technical Field

[0001] The present application relates to the field of optical imaging, and in particular to an ultra-wide-angle high-definition optical system and a camera module using the same. Background Art

[0002] In recent years, the automotive assisted driving system has developed rapidly, and the on-board optical lens plays an irreplaceable role as the eyes of the car to obtain external information. In order to meet higher imaging quality requirements and a larger visual range, it is necessary to reasonably match the lenses. However, many lenses on the market currently have shortcomings such as small field of view, poor clarity, large performance degradation under high and low temperatures, and low relative illumination. Summary of the invention

[0003] In order to overcome the shortcomings of existing lenses such as small field of view, poor clarity, large performance attenuation at high and low temperatures, and low relative illumination, the present application provides an optical system with ultra-wide angle, high-definition resolution, stable performance at high and low temperatures, high illumination, and a camera module applied thereto, which has great potential in the field of in-vehicle intelligent driving.

[0004] An ultra-wide-angle high-definition optical system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in sequence from the object plane to the image plane along the optical axis: The object side of the first lens is convex, the image side is concave, and its optical power is negative; The object side of the second lens is convex, the image side is concave, and its optical power is negative; The third lens has positive optical power; The object side of the fourth lens is convex or concave, the image side is convex, and its optical power is positive; The fifth lens has optical power; The sixth lens has optical power; Preferably, each lens of the optical system satisfies the following conditions: -7.0mm<f1<-6.1mm; -5.3 mm<f2<-2.9 mm; 4.5mm<f3<10.5mm; 3.0mm<f4<8.5mm; -4.5mm<f5<3.5mm; -3.7mm<f6<5.7mm; Among them, 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.

[0005] Preferably, each lens of the optical system satisfies the following conditions: 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; Among them, 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.

[0006] Preferably, the relative illumination of the maximum field of view of the optical system satisfies: RI ≥ 45%.

[0007] Preferably, the curvature radius R1 of the object surface side of the first lens satisfies: R1 < 13 mm.

[0008] Preferably, the curvature radius R1 of the object surface side of the third lens satisfies: -11 mm < R1 < 17 mm.

[0009] Preferably, the total optical length TTL of the optical system satisfies: TTL ≤ 19 mm.

[0010] Preferably, the third lens and the fourth lens are glass or plastic lenses.

[0011] Preferably, the horizontal field angle FOV of the optical system satisfies: FOV≥200°, and the maximum image circle satisfies: MIC≥5.76mm.

[0012] Preferably, the aperture is arranged between the third lens and the fourth lens.

[0013] Preferably, the fifth lens and the sixth lens are bonded together to form a combined lens.

[0014] On the other hand, an embodiment of the present application also provides a camera module, which includes at least an optical lens, in which the above-mentioned vehicle-mounted lens ultra-wide-angle high-definition optical system is installed.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an ultra-wide-angle high-definition optical system and a camera module used therein, which is mainly composed of 6 lenses. The object side of the first lens is convex, the image side is concave, and its focal power is negative; the object side of the second lens is convex, the image side is concave, and its focal power is negative; the third lens has positive focal power; the object side of the fourth lens is convex or concave, the image side is convex, and its focal power is positive; the fifth lens has focal power; and the sixth lens has focal power. The number of lenses is reasonable, the structure is simple, and the imaging quality of the optical system is improved by reasonably allocating the focal power of the lenses, optimizing the lens aberration, and taking into account the characteristics of ultra-wide angle, high illumination, and excellent temperature characteristics, which has great potential in the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for describing the embodiments are briefly introduced below.

[0017] Figure 1 It is a structural schematic diagram of the optical system or camera module of Example 1 of the present application; Figure 2 is an astigmatism and distortion curve diagram of the optical system or camera module of Example 1 of the present application; Figure 3 is an MTF curve diagram of the optical system or camera module of Example 1 of the present application; Figure 4 It is a structural schematic diagram of an optical system or a camera module according to Embodiment 2 of the present application; Figure 5 is an astigmatism and distortion curve diagram of the optical system or camera module of Example 2 of the present application; Figure 6 is an MTF curve diagram of the optical system or camera module of Example 2 of the present application; Figure 7 It is a structural schematic diagram of an optical system or a camera module according to Embodiment 3 of the present application; Figure 8 is an astigmatism and distortion curve diagram of the optical system or camera module of Example 3 of the present application; Fig. 9 It is an MTF curve diagram of the optical system or camera module of Example 3 of the present application. DETAILED DESCRIPTION

[0018] like Figure 1-9 As shown, the present 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.

[0019] The object side of the first lens is convex, the image side is concave, and its optical power is negative; The object side of the second lens is convex, the image side is concave, and its optical power is negative; The third lens has positive optical power; The object side of the fourth lens is convex or concave, the image side is convex, and its optical power is positive; The fifth lens has optical power; The sixth lens has optical power; The present invention provides an ultra-wide-angle high-definition optical system and a camera module used therein, which is mainly composed of 6 lenses. The object side of the first lens is convex, the image side is concave, and its focal power is negative; the object side of the second lens is convex, the image side is concave, and its focal power is negative; the third lens has positive focal power; the object side of the fourth lens is convex or concave, the image side is convex, and its focal power is positive; the fifth lens has focal power; and the sixth lens has focal power. The number of lenses is reasonable, the structure is simple, and the imaging quality of the optical system is improved by reasonably allocating the focal power of the lenses, optimizing the lens aberration, and taking into account the characteristics of ultra-wide angle, high illumination, and excellent temperature characteristics, which has great potential in the market.

[0020] Further, as a preferred embodiment of the present invention but not limiting, each lens of the optical system satisfies 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: -7.0mm<f1<-6.1mm. This design can make the first lens 1 have a large negative focal length, which is beneficial to reducing the astigmatism and field curvature of the optical system; -5.3 mm<f2<-2.9 mm, by constraining the ratio of the focal 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 is fine-tuned and controlled, thereby effectively improving the imaging quality of the system; 4.5mm<f3<10.5mm, by constraining the ratio of the focal 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; 3.0mm<f4<8.5mm, by constraining the ratio of the focal 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 is fine-tuned and controlled, thereby effectively improving the imaging quality of the system; -4.5mm<f5<3.5mm, by constraining the ratio of the fifth lens 5 focal length 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; -3.7mm<f6<5.7mm, by constraining the ratio of the sixth lens 6 focal length to the effective focal length of the optical imaging system within a reasonable range, the configured vehicle-mounted surround view optical system has the advantages of ultra-wide angle, small aperture, high illumination and excellent temperature characteristics, compact structure, easy processing and installation, and at the same time, the configuration of a large aperture can increase the amount of light entering the optical system and higher imaging quality.

[0021] Furthermore, the refractive index Nd1 and the 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. Furthermore, the refractive index Nd2 and the 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. Furthermore, the refractive index Nd3 and the 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. Furthermore, the refractive index Nd4 and the 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. Furthermore, the refractive index Nd5 and the 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. Furthermore, the refractive index Nd6 and the Abbe number Vd6 of the sixth lens 6 satisfy: 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. Further, as a preferred embodiment of the present invention but not limiting, the relative illumination of the maximum field of view of the optical system satisfies: RI ≥ 45%. By controlling the relative illumination, the brightness of the field of view at the edge of the lens can be improved; Further, as a preferred embodiment of the present invention but not limitation, the curvature radius R1 of the object side of the first lens satisfies: R1 < 13 mm. By controlling the object side of the first lens 1, the total deflection angle of the object side of the first lens 1 at the edge field of view can be reasonably controlled within a reasonable range.

[0022] Further, as a preferred embodiment of the present invention but not limiting, the third and fourth lenses are glass or plastic lenses, which can effectively improve the focus offset under high and low temperature conditions.

[0023] Further, as a preferred embodiment of the present invention but not a limitation, 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.

[0024] Further, as a preferred embodiment of the present invention but not a limitation, the horizontal field angle FOV of the optical system satisfies: FOV≥200°, and the maximum image circle satisfies: MIC≥5.76mm, which is conducive to expanding the field of view and meeting the needs of users; Further, as a preferred embodiment of the present invention but not limitation, 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.

[0025] Specifically, as a preferred embodiment of the present invention but not limiting, Figure 1-3 As shown, in this embodiment 1, the focal length f1 of the first lens 1 is -6.24mm, the focal length f2 of the second lens 2 is -3.35mm, the focal length f3 of the third lens 3 is 5.81mm, the focal length f4 of the fourth lens 4 is 3.81mm, the focal length f5 of the fifth lens 5 is -2.89mm, the focal length f6 of the sixth lens 6 is 3.72mm, the total optical length TTL is 18.6mm, and the surface type, curvature radius, thickness and material parameters of each lens are shown in Table 1: Table 1: Basic parameters of the optical system of Example 1

[0026] In the above Table 1, 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 position of the aperture 7; S13 and S14 correspond to the two surfaces of the filter 8; IMA corresponds to the image plane 9.

[0027] Further, in Table 1, the object side and image side of any one of the second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical formula:

[0028] 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 cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula. Table 2 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspherical surface that can be used in Example 1.

[0029] Table 2: Aspheric surface related values ​​of the lens surface of Example 1

[0030] Figure 2 The astigmatism and distortion curves of the optical imaging lens of Example 1 are shown, where astigmatism represents the meridional image curvature and the sagittal image curvature, and distortion represents the distortion magnitude values ​​corresponding to different image heights; Figure 3 The MTF curve of the optical imaging lens of Example 1 is shown, which represents the MTF values ​​in the meridian direction and sagittal direction of different fields of view at different spatial frequencies. Figure 2 and Figure 3 It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality and has higher imaging quality.

[0031] Specifically, as a preferred embodiment of the present invention but not limiting, Figure 4-6 As shown, in this embodiment 2, the focal length of the first lens 1 is f1=-6.78mm, the focal length of the second lens 2 is f2=-4.66mm, the focal length of the third lens 3 is f3=5mm, the focal length of the fourth lens 4 is f4=6.36mm, the focal length of the fifth lens 5 is f5=-2.97mm, the focal length of the sixth lens 6 is f6=3.22mm, the total optical length TTL=19mm, and the surface type, curvature radius, thickness and material parameters of each lens are shown in Table 3: Table 3: Basic parameters of the optical system of Example 2

[0032] In the above Table 3, 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 position of the aperture 7; S13 and S14 correspond to the two surfaces of the filter 8; IMA corresponds to the image plane 9.

[0033] Further, in Table 3, the object side surface and the 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 surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0034] 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 cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula. Table 4 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspherical surface that can be used in Example 2.

[0035] Table 4: Aspheric surface related values ​​of lens surface in Example 2

[0036] Figure 5 The astigmatism and distortion curves of the optical imaging lens of Example 2 are shown, where astigmatism represents the meridional image curvature and the sagittal image curvature, and distortion represents the distortion magnitude values ​​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 ​​in the meridian direction and sagittal direction of different fields of view at different spatial frequencies. Figure 5 and Figure 6 It can be seen that the optical imaging system provided in Example 2 can achieve good imaging quality and has higher imaging quality.

[0037] Specifically, as a preferred embodiment of the present invention but not limiting, Figure 7-9 As shown, in this embodiment 3, the focal length f1 of the first lens 1 is -6.36 mm, the focal length f2 of the second lens 2 is -3.34 mm, the focal length f3 of the third lens 3 is 8.71 mm, the focal length f4 of the fourth lens 4 is 5.09 mm, the focal length f5 of the fifth lens 5 is 2.51 mm, the focal length f6 of the sixth lens 6 is -3.63 mm, the total optical length TTL is 18.5 mm, and the surface type, curvature radius, thickness and material parameters of each lens are shown in Table 5: Table 5: Basic parameters of the optical system of Example 3

[0038] In the above Table 5, 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 position of the aperture 7; S13 and S14 correspond to the two surfaces of the filter 8; IMA corresponds to the image plane 9.

[0039] Further, in Table 5, the object side and image side of any one of the second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical formula:

[0040] 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 cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface shape formula. Table 6 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspheric surface that can be used in Example 3.

[0041] Table 6: Aspheric surface related values ​​of lens surface in Example 3

[0042] Figure 8 The astigmatism and distortion curves of the optical imaging lens of Example 3 are shown, where astigmatism represents the meridional image curvature and the sagittal image curvature, and distortion represents the distortion magnitude values ​​corresponding to different image heights; Fig. 9 The MTF curve of the optical imaging lens of Example 3 is shown, which represents the MTF values ​​in the meridian direction and sagittal direction of different fields of view at different spatial frequencies. Figure 8 and Fig. 9 It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality and has higher imaging quality.

[0043] Further, in Examples 1-3, the basic data are as follows: Table 7: Basic data of Examples 1-3

[0044] A camera module at least includes an optical lens, in which the ultra-wide-angle high-definition optical system is installed. The vehicle-mounted lens of the present invention has the characteristics of ultra-wide-angle, high-definition resolution, and excellent temperature characteristics, and has stronger competitiveness among lenses of the same type.

[0045] As described above, one or more implementation methods are provided in combination with specific contents, and the specific implementation of the present invention is not limited to these descriptions. Any similarity or similarity with the method, structure, etc. of the present invention, or any technical deduction or replacement based on the concept of the present invention, shall be regarded as the protection scope of the present invention.

Claims

1. An ultra-wide-angle high-definition optical system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in sequence from the object plane to the image plane along the optical axis, characterized in that: The object side of the first lens is convex, the image side is concave, and its optical power is negative; The object side of the second lens is convex, the image side is concave, and its optical power is negative; The third lens has positive power; The object side of the fourth lens is convex or concave, the image side is convex, and its optical power is positive; The fifth lens has optical power; The sixth lens has optical power; The fifth lens and the sixth lens are bonded together to form a combined lens; Each lens of the optical system meets the following conditions: -7.0mm<f1<-6.1mm; -5.3 mm<f2<-2.9 mm; 4.5mm<f3<10.5mm; 3.0mm<f4<8.5mm; -4.5mm<f5<3.5mm; -3.7mm<f6<5.7mm; Among them, 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 ultra-wide-angle high-definition optical system according to claim 1, characterized in that: Each lens of the optical system meets the following conditions: 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; Among them, 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.

3. The ultra-wide-angle high-definition optical system according to claim 1, characterized in that: The relative illumination of the maximum field of view of the optical system meets the requirement: RI ≥ 45%.

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

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

6. 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.

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

8. The ultra-wide-angle high-definition optical system according to claim 1, characterized in that: The horizontal field angle FOV of the optical system satisfies: FOV ≥ 200°, and the maximum image circle satisfies: MIC ≥ 5.76 mm.

9. The ultra-wide-angle high-definition optical system according to claim 1, characterized in that: The aperture is arranged 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 the ultra-wide-angle high-definition optical system described in any one of claims 1 to 9.

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