An all-glass automotive optical system and its application in camera modules

Abstract

This invention provides an all-glass automotive optical system and its camera module, which mainly consists of six lenses. By rationally matching the lens shape and optical power, the distortion of the lens in a small field of view is increased to meet the special algorithm requirements of the automotive system. While improving the resolution of the entire lens group, the aperture and length of the lens are also effectively controlled. It has the advantages of high pixel and high resolution design, effectively meeting the design requirements of high resolution and miniaturization of optical systems. The structure is compact, easy to process and install, and further improves the imaging effect of the equipment used in the system.

Description

Technical Field

[0001] This application relates to the field of optical imaging, and in particular to an all-glass automotive optical system and its application camera module. Background Technology

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

[0003] This application aims to provide an all-glass vehicle optical system with the advantages of high pixel count and high resolution design, compact structure, easy processing and installation, and further improves the imaging effect of the equipment used with the system.

[0004] An all-glass vehicle-mounted optical system, consisting of a first lens, a second lens, a third lens, an aperture stop, 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 positive optical power, its object side is concave, and its image side is convex.

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

[0008] The second lens and the third lens constitute an adhesive lens;

[0009] The fourth lens has a convex surface on its object side.

[0010] The fifth lens has a convex image-side surface.

[0011] The fourth lens and the fifth lens constitute an adhesive lens;

[0012] The sixth lens has positive optical power and its object-side surface is convex.

[0013] As described above, the all-glass vehicle optical system has a field of view (FOV) ∈ [100°, 200°] and a total length (TTL) ≤ 30 mm.

[0014] The all-glass vehicle-mounted optical system as described above, the optical system satisfies the following relationship: D1 / (Fno*Ymax) < 1.0; 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.

[0015] The all-glass vehicle-mounted optical system as described above, the optical system satisfies the following relationship: -12.5mm < f1 < -10.0mm; 5.0mm < f2 < 10.0mm; -25.0mm < f3 < -15.0mm; -20.0mm < f4 < 10.0mm; -20.0mm < f5 < 7.0mm; 19.0mm < f6 < 55.0mm; where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

[0016] The all-glass vehicle-mounted optical system as described above, the optical system satisfies the following relationship: -5.0 < f1 / f < -1.0; 1.0 < f2 / f < 3.0; -4.0 < f3 / f < -2.0; -3.0 < f4 / f < 2.0; -3.0 < f5 / f < 1.0; 2.0 < f6 / f < 8.0; where f is the focal length of the entire optical system, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

[0017] The all-glass vehicle-mounted optical system as described above, the optical system satisfies the following relationship: -5.0 < R3 / f < -0.01; where R3 is the object-side curvature of the second lens and f is the total focal length of the optical system.

[0018] The all-glass vehicle-mounted optical system as described above, the optical system satisfies the following relationship: 0.1 < R1 / f < 1.2; where R1 is the object-side curvature of the first lens and f is the total focal length of the optical system.

[0019] The all-glass vehicle-mounted optical system as described above, the optical system satisfies the following relationship: Nd3 < 1.95; where Nd3 is the refractive index of the third lens material.

[0020] The all-glass vehicle-mounted optical system as described above, the optical system satisfies the following relationship: H / f < 1.5; where H is the image height of the optical system and f is the total focal length of the optical system.

[0021] The all-glass vehicle-mounted optical system as described above, the optical system satisfies the following relationship: TTL / f < 4.5;

[0022] Where f is the total focal length of the optical system, and TTL is the total optical length of the optical system.

[0023] As described above, in the all-glass vehicle optical system, the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens are spherical lenses, and the aperture stop is located between the third lens and the fourth lens.

[0024] On the other hand, this application embodiment also provides a camera module, which includes at least an optical lens, and the above-mentioned all-glass vehicle optical system is installed in the optical lens.

[0025] Compared with the prior art, the beneficial effects of this application are as follows:

[0026] This invention provides an all-glass automotive optical system and its camera module, which mainly consists of six lenses. By rationally matching the lens shape and optical power, the distortion of the lens in a small field of view is increased to meet the special algorithm requirements of the automotive system. While improving the resolution of the entire lens group, the aperture and length of the lens are also effectively controlled. It has the advantages of high pixel and high resolution design, effectively meeting the design requirements of high resolution and miniaturization of optical systems. The structure is compact, easy to process and install, and further improves the imaging effect of the equipment used in the system. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 1 of this application;

[0029] Figure 2 The field curvature curve and distortion curve of the optical system or camera module in Embodiment 1 of this application;

[0030] Figure 3 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 2 of this application;

[0031] Figure 4 The field curvature curve and distortion curve of the optical system or camera module in Embodiment 2 of this application;

[0032] Figure 5 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 3 of this application;

[0033] Figure 6 These are the field curvature curves and distortion curves of the optical system or camera module in Embodiment 3 of this application. Detailed Implementation

[0034] like Figure 1-6 As shown, this application provides an all-glass automotive optical system, which consists of a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, and a sixth lens sequentially along the optical axis from the object plane to the image plane. The first lens has negative optical power, with a convex object-side surface and a concave image-side surface. The second lens has positive optical power, with a concave object-side surface and a convex image-side surface. The third lens has negative optical power, with a concave object-side surface and a convex image-side surface. The second and third lenses form a bonded lens. The fourth lens has a convex object-side surface. The fifth lens has a convex image-side surface. The fourth and fifth lenses form a bonded lens. The sixth lens has positive optical power and a convex object-side surface.

[0035] The optical system of this invention mainly consists of six lenses. By rationally matching the lens shape and optical power, the distortion of the lens in a small field of view is increased to meet the special algorithm requirements of the vehicle system. While improving the resolution of the entire lens group, the aperture and length of the lens are also effectively controlled. It has the advantages of high pixel and high resolution design, effectively meeting the design requirements of high resolution and miniaturization of the optical system. The structure is compact, easy to process and install, and further improves the imaging effect of the equipment used in the system.

[0036] Furthermore, the optical system satisfies the following relationship: FOV∈[100°, 200°], where FOV is the maximum field of view of the optical system. The design of the large field of view of the optical system effectively meets the actual needs of the optical system.

[0037] Furthermore, the optical system satisfies the following relationship: D1 / (Fno*Ymax)<1.0, where D1 is the maximum effective optical diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system. Limiting the maximum image circle and aperture size of the optical imaging system achieves the purpose of limiting the effective optical diameter of the first lens, thereby ensuring the miniaturization of the optical system.

[0038] Furthermore, the optical system satisfies the following relationships: (1) -12.5 mm < f1 < -10.0 mm; (2) 5.0 mm < f2 < 10.0 mm; (3) -25.0 mm < f3 < -15.0 mm; (4) -20.0 mm < f4 < 10.0 mm; (5) -20.0 mm < f5 < 7.0 mm; (6) 19.0 mm < f6 < 55.0 mm; where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. Reasonable control of the effective focal lengths of each lens in the optical system enables the optical system to satisfy a large field angle while restricting the effective diameter of the components, controlling the size of the overall optical system, and adjusting the light incident angle, which is beneficial to correcting the system aberration.

[0039] Furthermore, the optical system satisfies the following relationships: (1) -5.0 < f1 / f < -1.0; (2) 0.1 < f2 / f < 3.0; (3) -4.0 < f3 / f < -1.0; (4) -3.0 < f4 / f < 2.0; (5) -3.0 < f5 / f < 1.0; (6) 2.0 < f6 / f < 8.0; where f is the focal length of the entire optical system, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. The limitation of the ratio of the effective focal lengths of each lens to the effective focal length of the optical system enables the optical system to obtain a reasonable light deflection angle, effectively reducing the sensitivity of the component tolerances and improving the system aberration.

[0040] Furthermore, the optical system satisfies the following relationships: -5.0 < R3 / f < -0.01; 0.1 < R1 / f < 1.2; where R3 is the object-side curvature of the second lens and R1 is the object-side curvature of the first lens, and f is the total focal length of the optical system. By controlling the curvatures of the object sides of the first lens and the second lens, the distortion of the entire optical imaging lens within a small angle range can be significantly increased to meet the special distortion requirements of the vehicle-mounted imaging system.

[0041] Furthermore, the optical system satisfies the following relationship: Nd3 < 1.95; where Nd3 is the refractive index of the third lens material; reasonable selection of the lens material refractive index helps to make the light more gentle, effectively reducing the primary aberration and various higher-order aberrations generated by the optical system, which is beneficial to achieving high resolution.

[0042] Furthermore, the optical system satisfies the following relationship: H / f < 1.5; where H is the image height of the optical system and f is the total focal length of the optical system. By controlling the focal length and image height of the optical system within a certain range, it is beneficial to improve the resolution of the entire optical imaging system and achieve high resolution.

[0043] Furthermore, the optical system satisfies the following relationship: TTL / f < 4.5; where TTL is the total optical length of the optical system, and f is the total focal length of the optical system. Limiting the ratio of the total optical length to the effective focal length of the optical system effectively restricts the length of the lens under the condition of a fixed focal length.

[0044] Example 1

[0045] The following is for reference Figures 1 to 2 Describes an optical imaging lens according to Embodiment 1 of this application. Figure 1 A schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application is shown.

[0046] like Figure 1 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, and an imaging plane S14.

[0047] 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 positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S4 being concave and its image-side surface S5 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S8 being convex and its image-side surface S9 being convex. The sixth lens E6 has positive optical power, with its object-side surface S10 being convex and its image-side surface S11 being concave. The filter E7 has an object-side surface S12 and an image-side surface S13. Light from the object passes sequentially through surfaces S1 to S13 and is finally imaged onto the imaging surface S14.

[0048] Table 1 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 1, wherein the units for radius of curvature and thickness are millimeters (mm).

[0049] Table 1

[0050]

[0051] In Table 1, the object-side surface and image-side surface of the first lens E1 and the sixth lens E6 are both aspherical. The surface shape of their aspherical lenses can be defined using, but is not limited to, the following aspherical formula:

[0052]

[0053] 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.

[0054] Table 2

[0055]

[0056] Figure 2 The field curvature and distortion curves of the optical imaging lens of Example 1 are shown. The optical imaging lens given in Example 1 can achieve good imaging quality.

[0057] Example 2

[0058] The following is for reference 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.

[0059] like Figure 3 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, and an imaging plane S14.

[0060] 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 positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S4 being concave and its image-side surface S5 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S8 being concave and its image-side surface S9 being convex. The sixth lens E6 has positive optical power, with its object-side surface S10 being convex and its image-side surface S11 being concave. The filter E7 has an object-side surface S12 and an image-side surface S13. Light from the object passes sequentially through surfaces S1 to S13 and is finally imaged onto the imaging surface S14.

[0061] 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).

[0062] Table 3

[0063]

[0064] In Table 3, the object-side surface and image-side surface of the first lens E1 and the sixth lens E6 are both aspherical. The surface shape of their aspherical lenses can be defined using, but is not limited to, the following aspherical formula:

[0065]

[0066] 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 coefficients A4, A6, A8, A10, A12, A14, and A16 for each aspherical surface that can be used in the second embodiment.

[0067] Table 4

[0068]

[0069] Figure 4 The field curvature and distortion curves of the optical imaging lens of Example 2 are shown. The optical imaging lens given in Example 2 can achieve good imaging quality.

[0070] Example 3

[0071] The following is for reference 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.

[0072] like Figure 5 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, and an imaging plane S14.

[0073] 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 positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S4 being concave and its image-side surface S5 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S8 being convex and its image-side surface S9 being convex. The sixth lens E6 has positive optical power, with its object-side surface S10 being convex and its image-side surface S11 being convex. The filter E7 has an object-side surface S12 and an image-side surface S13. Light from the object passes sequentially through surfaces S1 to S13 and is finally imaged onto the imaging surface S14.

[0074] 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).

[0075] Table 5

[0076]

[0077] In Table 5, the object-side surface and image-side surface of the first lens E1 and the sixth lens E6 are both aspherical. The surface shape of their aspherical lenses can be defined using, but is not limited to, the following aspherical formula:

[0078]

[0079] 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, and A16 that can be used for each aspherical surface in the third embodiment.

[0080] Table 6

[0081]

[0082] In Examples 1-3, the basic data is as follows:

[0083] Table 7

[0084]

[0085] In Examples 1-3, each conditional expression satisfies the conditions in the table below:

[0086] Table 8

[0087]

[0088] A camera module includes at least an optical lens, within which the aforementioned all-glass automotive optical system is installed. This increases the lens's distortion within a small field of view to meet the specific algorithm requirements of the automotive system. Furthermore, while improving the overall resolution of the lens assembly, it effectively controls the lens aperture and length, offering advantages such as high pixel count and high resolution. Its compact structure facilitates manufacturing and installation, further enhancing the imaging performance of the system.

[0089] 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 all-glass vehicle-mounted 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, an aperture stop, 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 positive optical power, its object side is concave, and its image side is convex. The third lens has negative optical power, its object side is concave, and its image side is convex. The second lens and the third lens constitute an adhesive lens; The fourth lens has a convex surface on its object side. The fifth lens has a convex image-side surface. The fourth lens and the fifth lens constitute an adhesive lens, one of which has positive optical power and the other has negative optical power; The sixth lens has positive optical power and its object-side surface is convex. The optical system satisfies the following relationship: -12.5mm < f1 < -10.0mm; 5.0mm < f2 < 10.0mm; -25.0mm < f3 < -15.0mm; -20.0mm < f4 < 10.0mm; -20.0mm < f5 < 7.0mm; 19.0mm < f6 < 55.0mm; Where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

2. The all-glass vehicle-mounted optical system according to claim 1, characterized in that: The optical system satisfies the following relationship: -5.0 < f1 / f < -1.0; 1.0 < f² / f < 3.0; -4.0 < f3 / f < -2.0; -3.0 < f4 / f < 2.0; -3.0 < f5 / f < 1.0; 2.0 < f6 / f < 8.0; Where f is the focal length of the entire optical system, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

3. The all-glass vehicle-mounted optical system according to claim 1, characterized in that: The optical system has a full field of view (FOV) of [100°, 200°] and a total length (TTL) of ≤30 mm.

4. The all-glass vehicle-mounted optical system according to claim 1, characterized in that: The optical system satisfies the following relationship: D1 / (Fno*Ymax) <1.0; 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.

5. The all-glass automotive optical system according to claim 1, characterized in that: The optical system satisfies the following relationship: -5.0 <R3 / f<-0.01; 0.1 <R1 / f<1.2; Wherein, R3 is the object curvature of the second lens, R1 is the object curvature of the first lens, and f is the total focal length of the optical system.

6. The all-glass automotive optical system according to claim 1, characterized in that: The optical system satisfies the following relationship: Nd3 < 1.95; Wherein, Nd3 is the refractive index of the third lens material.

7. The all-glass automotive optical system according to claim 1, characterized in that: The optical system satisfies the following relationship: H / f < 1.5; Where H is the image height of the optical system and f is the total focal length of the optical system.

8. The all-glass automotive optical system according to claim 1, characterized in that: The optical system satisfies the following relationship: TTL / f < 4.5; Where f is the total focal length of the optical system, and TTL is the total optical length of the optical system.

9. The all-glass vehicle-mounted optical system according to claim 1, characterized in that: The first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens are spherical lenses.

10. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with the all-glass vehicle optical system as described in any one of claims 1-9.

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