A high-pixel forward-looking intelligent driving optical system and an application camera module thereof

Abstract

The application provides a high-pixel forward-looking intelligent driving optical system and an applied camera module. The optical system is sequentially composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. Through reasonable distribution of the surface shape and the optical power of each lens, the volume of the optical system can be effectively reduced, the performance of a large target surface, a large aperture and high pixels is achieved, the optical system has the unique advantages of stable performance, high pixels, a large aperture, a large target surface, no thermalization and no ghost image, and the driving safety of the driver and passengers can be more effectively protected.

Description

Technical Field

[0001] This application relates to the field of optical imaging, and more particularly to a high-pixel forward-looking intelligent driving optical system and its application camera module. Background Technology

[0002] In recent years, with the continuous development of intelligent driving technology and its increasing application in automobiles, automotive lenses, as a core component of intelligent driving systems, are crucial 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 aperture, a large sensor area, and is free from pyrolysis and ghosting has become a sought-after goal. Summary of the Invention

[0003] To overcome the technical problems of high cost and mediocre imaging performance of existing automotive optical lenses, this application provides a high-pixel forward-looking intelligent driving optical system with unique advantages such as stable performance, high pixel count, large aperture, large target surface, no pyrolysis, and no ghosting, which can more effectively protect the driving safety of drivers and passengers.

[0004] A high-pixel forward-looking intelligent driving optical system is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in sequence along the optical axis from the object plane to the image plane.

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

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

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

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

[0009] The fifth lens has negative optical power and its object side is concave.

[0010] The fourth lens and the fifth lens constitute a bonded lens, and its optical power is positive.

[0011] The sixth lens has optical power and its image-side surface is concave.

[0012] The high-pixel forward-looking intelligent driving optical system described above satisfies the following condition: D1 / (Fno*Ymax)<1.53;

[0013] Where D1 is the maximum effective diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system.

[0014] The high-pixel forward-looking intelligent driving optical system described above satisfies the following conditions: Nd1>1.69, Vd1<55;

[0015] Where Nd1 is the refractive index of the first lens and Vd1 is the Abbe number of the first lens.

[0016] The high-pixel forward-looking intelligent driving optical system described above satisfies the following condition: R3 / R2 < -2.1;

[0017] Where R2 is the radius of curvature of the second surface of the first lens, and R3 is the radius of curvature of the first surface of the second lens.

[0018] The high-pixel forward-looking intelligent driving optical system described above satisfies the following condition: f45 / f3 > 1.12;

[0019] Where f45 is the effective focal length of the bonded lens, and f3 is the effective focal length of the third lens.

[0020] The high-pixel forward-looking intelligent driving optical system described above satisfies the following condition: -2.23 <f3 / f1<-1.04;0.62<Vd3 / Vd1<1.98;

[0021] Where f3 is the effective focal length of the third lens, f1 is the effective focal length of the first lens, Vd3 is the Abbe number of the third lens, and Vd1 is the Abbe number of the first lens.

[0022] The high-pixel forward-looking intelligent driving optical system described above satisfies the following condition: (dn / dt)³ < 1.6 * 10⁻⁶ -06 / ℃;

[0023] Where (dn / dt)3 is the temperature coefficient of the refractive index of the third lens.

[0024] The high-pixel forward-looking intelligent driving optical system described above satisfies the following condition: (dn / dt)⁴ < -3.6 * 10⁻⁶. -06 / ℃;

[0025] Where (dn / dt)4 is the temperature coefficient of the refractive index of the fourth lens.

[0026] The high-pixel forward-looking intelligent driving optical system described above satisfies the following condition: -1.23 <f4 / f5<-0.56;

[0027] 1.87 <Vd4 / Vd5<5.28;

[0028] Where f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, Vd4 is the Abbe number of the fourth lens, and Vd5 is the Abbe number of the fifth lens.

[0029] In the high-pixel forward-looking intelligent driving optical system described above, the aperture stop of the optical system is located between the second lens and the third lens or between the third lens and the fourth lens.

[0030] On the other hand, this application embodiment also provides a camera module, which includes at least an optical lens, and the aforementioned high-pixel forward-looking intelligent driving optical system is installed in the optical lens.

[0031] Compared with the prior art, the beneficial effects of this application are as follows:

[0032] The high-pixel forward-looking intelligent driving optical system and its application camera module of this invention are composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in sequence. By rationally allocating the surface shape and optical power of each lens, the size of the optical system can be effectively reduced, achieving a large target surface, a large aperture, and high pixel performance. It has unique advantages such as stable performance, high pixel count, large aperture, large target surface, no heat generation, and no ghosting, and can more effectively protect the driving safety of drivers and passengers. Attached Figure Description

[0033] 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.

[0034] Figure 1 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 1 of this application;

[0035] Figure 2 The field curvature and distortion curves of the optical system or camera module in Embodiment 1 of this application;

[0036] Figure 3 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 2 of this application;

[0037] Figure 4 The field curvature and distortion curves of the optical system or camera module in Embodiment 2 of this application;

[0038] Figure 5 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 3 of this application;

[0039] Figure 6 The field curvature and distortion curves of the optical system or camera module in Embodiment 3 of this application are shown. Detailed Implementation

[0040] like Figure 1-6As shown, this application provides a high-pixel forward-looking intelligent driving optical system, which is composed of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 in sequence along the optical axis from the object plane to the image plane.

[0041] The first lens E1 has negative optical power, its object side is convex, and its image side is concave.

[0042] The second lens E2 has optical power, its object side is concave, and its image side is convex.

[0043] The third lens E3 has positive optical power, its object side is convex, and its image side is flat.

[0044] The fourth lens E4 has positive optical power, its object side is convex, and its image-object side is convex.

[0045] The fifth lens E5 has negative optical power and its object side is concave.

[0046] The fourth lens E4 and the fifth lens E5 constitute a bonded lens with positive optical power;

[0047] The sixth lens E6 has optical power and its image-side surface is concave.

[0048] The aperture STO is located between the second lens E2 and the third lens E3, or between the third lens E3 and the fourth lens E4.

[0049] The high-pixel forward-looking intelligent driving optical system of this invention consists of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. By rationally allocating the surface shape and optical power of each lens, the size of the optical system can be effectively reduced, achieving a large target surface, a large aperture, and high pixel count. It has unique advantages such as stable performance, high pixel count, large aperture, large target surface, no heat generation, and no ghosting, and can more effectively protect the driving safety of drivers and passengers.

[0050] Furthermore, the optical system satisfies the following condition: D1 / (Fno*Ymax)<1.53; where D1 is the maximum effective diameter of the first lens E1, Fno is the system aperture, and Ymax is the maximum image circle radius of the system. By limiting the size of the maximum image circle and aperture of the optical imaging system, the effective optical diameter of the first lens is limited, thereby ensuring the miniaturization requirement of the system.

[0051] Furthermore, the optical system satisfies the following conditions: Nd1 > 1.69, Vd1 < 55; where Nd1 is the refractive index of the first lens E1, and Vd1 is the Abbe number of the first lens E1. By using materials with a high refractive index, it helps to further reduce the outer diameter of the component and meet the customer's requirement for small size.

[0052] Furthermore, the optical system satisfies the following conditions: R3 / R2 < -2.1; where R2 is the curvature radius of the second surface of the first lens E1, and R3 is the curvature radius of the first surface of the second lens E2. By controlling the ratio of the curvature radius of the second surface of the first lens E1 and the curvature radius of the first surface of the second lens E2 of the optical system, on the one hand, it is beneficial to control the incident light height of the light beam entering the optical system to reduce the high-order aberration of the optical system and the outer diameter of the lens; on the other hand, it can optimize and improve the ghost image energy to meet the customer's requirement for ghost image performance.

[0053] Furthermore, the optical system satisfies the following conditions: f45 / f3 > 1.12; where f45 is the effective focal length of the cemented lens, and f3 is the effective focal length of the third lens E3. By limiting the ratio of the effective focal lengths of the third lens E3 and the cemented lens, the deflection angle of the light in the optical system can be made small, effectively reducing the sensitivity of the component tolerance. At the same time, the use of the cemented lens can effectively reduce the position chromatic aberration and magnification chromatic aberration existing in the system, improving the system performance.

[0054] Furthermore, the optical system satisfies the following conditions: -2.23 < f3 / f1 < -1.04; 0.62 < Vd3 / Vd1 < 1.98; where f3 is the effective focal length of the third lens E3, f1 is the effective focal length of the first lens E1, Vd3 is the Abbe number of the third lens E3, and Vd1 is the Abbe number of the first lens E1. By limiting the ratio of the effective focal lengths of the third lens E3 and the first lens E1, the distortion of the system can be effectively corrected, improving the imaging quality of the peripheral field of view. At the same time, by reasonably matching the Abbe numbers of the materials, the chromatic aberration of the system can be further reduced, optimizing the imaging performance of the system.

[0055] Furthermore, the optical system satisfies the following conditions: (dn / dt)3 < 1.6*10 -06 / ℃, (dn / dt)4 < -3.6*10 -06 / ℃; where (dn / dt)3 is the refractive index temperature coefficient of the third lens E3, and (dn / dt)4 is the refractive index temperature coefficient of the fourth lens E4. By using materials with a low refractive index temperature coefficient, the temperature performance of the optical system can be effectively improved.

[0056] Furthermore, the optical system satisfies the following conditions: -1.23 < f4 / f5 < -0.56; 1.87 < Vd4 / Vd5 < 5.28; where f4 is the effective focal length of the fourth lens E4, f5 is the effective focal length of the fifth lens E5, Vd4 is the Abbe number of the fourth lens E4, and Vd5 is the Abbe number of the fifth lens E5. By limiting the ratio of the effective focal lengths of the fourth lens E4 and the fifth lens E5, the spherical aberration of the system can be effectively corrected, thereby ensuring the image quality of the field of view. At the same time, by reasonably matching the Abbe numbers of the materials, the chromatic aberration of the system can be further reduced, and the imaging quality of the system can be improved.

[0057] For the high-pixel forward-looking intelligent driving optical system as described above, the aperture STO of the optical system is located between the second lens E2 and the third lens E3 or between the third lens E3 and the fourth lens E4.

[0058] Example 1:

[0059] Specifically, as a preferred implementation manner of the present invention rather than a limitation, the following refers to Figures 1 to 2 Describe the optical imaging lens according to Embodiment 1 of the present application. Figure 1 FIG. shows a schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present application.

[0060] As Figure 1 shown, the optical imaging lens according to an exemplary embodiment of the present application sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0061] The first lens E1 has a negative optical power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has an optical power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has a positive optical power, its object side surface S6 is convex, and its image side surface S7 is flat. The fourth lens E4 has a positive optical power, its object side surface S8 is convex, and its image side surface S9 is convex. The fifth lens E5 has a negative optical power, its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has a positive optical power, its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0062] Table 1 shows the surface types, curvature radii, thicknesses, and materials of the lenses of the optical imaging lens of Example 1, where the units of the curvature radii and thicknesses are both millimeters (mm).

[0063] Table 1: Basic parameters of the optical system of Example 1

[0064]

[0065] In Table 1, the object-side surface and image-side surface of either the first lens E1 or the sixth lens E6 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0066]

[0067] 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.

[0068] Table 2: Aspherical correlation values ​​of the lens surface in Example 1

[0069]

[0070] Figure 2 The field curvature and distortion curves of the optical imaging lens of Example 1 are shown. (From...) Figure 2 It can be seen that the optical system given in Example 1 can achieve good imaging quality and realize high-performance design.

[0071] Example 2:

[0072] 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.

[0073] 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 fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0074] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has 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 S6 being convex and its image-side surface S7 being flat. 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 negative optical power, with its object-side surface S9 being concave and its image-side surface S10 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 concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0075] 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).

[0076] Table 3: Basic parameters of the optical system in Example 2

[0077]

[0078] In Table 3, the object-side surface and image-side surface of either the first lens E1 or the sixth lens E6 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0079]

[0080] 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.

[0081] Table 4: Aspherical correlation values ​​of the lens surface in Example 2

[0082]

[0083] Figure 4 The field curvature and distortion curves of the optical imaging lens of Example 2 are shown. (From...) Figure 4 It can be seen that the optical system given in Example 2 can achieve good imaging quality and realize high-performance design.

[0084] Example 3:

[0085] Specifically, as a preferred embodiment of the present invention and not a limitation thereof, the following references are made. 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.

[0086] 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 fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0087] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has 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 flat. 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 negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0088] 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).

[0089] Table 5: Basic parameters of the optical system in Example 3

[0090]

[0091] In Table 5, the object-side surface and image-side surface of either the first lens E1 or the sixth lens E6 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0092]

[0093] 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.

[0094] Table 6: Aspherical Correlation Values ​​of Lens Surface in Example 3

[0095]

[0096] In Examples 1-3, the basic data is as follows:

[0097] Table 7: Basic Data for Examples 1-3

[0098]

[0099] In Examples 1-3, each conditional expression satisfies the conditions in the table below:

[0100] Table 8: Conditional Expressions for Examples 1-3

[0101]

[0102] A camera module includes at least an optical lens, within which the aforementioned high-pixel forward-looking intelligent driving optical system is installed. The optical system is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. By rationally allocating the surface shape and optical power of each lens, the size of the optical system can be effectively reduced, achieving a large target surface, a large aperture, and high pixel count. It possesses unique advantages such as stable performance, high pixel count, large aperture, large target surface, no heat generation, and no ghosting, thus more effectively protecting the driving safety of drivers and passengers.

[0103] 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 forward-looking intelligent driving 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 first lens has negative optical power, its object side is convex, and its image side is concave. The second lens has negative optical power, its object side is concave, and its image side is convex. The third lens has positive optical power, its object side is convex, and its image side is flat. The fourth lens has positive optical power, and its object side is convex, and its image side is convex. The fifth lens has negative optical power, its object side is concave, and its image side is convex. The sixth lens has negative optical power, and its object side is concave, as is its image side. The fourth lens and the fifth lens constitute a bonded lens, and its optical power is positive. The aperture of the optical system is located between the second lens and the third lens; The optical system satisfies the following condition: D1 / (Fno*Ymax)=1.331; R3 / R2 = -2.866; f45 / f3 = 1.251; f3 / f1 = -1.137; f4 / f5 = -0.588; Wherein, D1 is the maximum effective diameter of the first lens, Fno is the system aperture, Ymax is the maximum image circle radius of the system, R2 is the second surface radius of curvature of the first lens, R3 is the first surface radius of curvature of the second lens, f45 is the effective focal length of the bonded lens, f3 is the effective focal length of the third lens, f1 is the effective focal length of the first lens, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

2. The high-pixel forward-looking intelligent driving optical system according to claim 1, characterized in that: The optical system satisfies the following conditions: Nd1 = 1.81, Vd1 = 40.97; Where Nd1 is the refractive index of the first lens and Vd1 is the Abbe number of the first lens.

3. The high-pixel forward-looking intelligent driving optical system according to claim 1, characterized in that: The optical system satisfies the following condition: Vd3 / Vd1 = 1.248; Where Vd3 is the Abbe number of the third lens and Vd1 is the Abbe number of the first lens.

4. The high-pixel forward-looking intelligent driving optical system according to claim 1, characterized in that: The optical system satisfies the following condition: (dn / dt)³ < 1.6*10 -06 / ℃; Where (dn / dt)3 is the temperature coefficient of the refractive index of the third lens.

5. The high-pixel forward-looking intelligent driving optical system according to claim 1, characterized in that: The optical system satisfies the following condition: (dn / dt)⁴ < -3.6*10 -06 / ℃; Where (dn / dt)4 is the temperature coefficient of the refractive index of the fourth lens.

6. The high-pixel forward-looking intelligent driving optical system according to claim 1, characterized in that: The optical system satisfies the following conditions: Vd4 / Vd5=4.319; Where Vd4 is the Abbe number of the fourth lens and Vd5 is the Abbe number of the fifth lens.

7. A camera module, comprising at least an optical lens, characterized in that, The optical lens is equipped with the high-pixel forward-looking intelligent driving optical system according to any one of claims 1-6.

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