Large aperture glass-plastic ring view vehicle-mounted optical system and application camera module thereof

Abstract

The utility model provides a kind of big aperture glass plastic ring view vehicle-mounted optical system and its application's camera module, it is mainly constituted by 7 lenses, the first lens has negative optical power, its object side is convex, its image side is concave;The second lens has negative optical power, its image side is concave;The third lens has negative optical power, its image side is concave;The fourth lens has optical power, its object side is convex;The fifth lens has positive optical power, its object side is convex, its image side is convex;The sixth lens, the seventh lens constitute adhesive lens;It has simple structure, with high resolving power, big aperture and the like advantages, improve the degree of picture illumination uniformity and imaging definition, and the TTL of lens is short, can be photographed field of view range is wider, reduce the production cost of big aperture glass plastic ring view vehicle-mounted lens.

Description

Technical Field

[0001] This application relates to the field of optical imaging, and in particular to a large-aperture glass-plastic surround-view vehicle optical system and its application camera module. Background Technology

[0002] In recent years, intelligent driving technology has been developing rapidly, and in-vehicle applications have emerged in large numbers. As a core component of intelligent driving systems, in-vehicle lenses are crucial to the safety of vehicles using such systems. In practical applications, in-vehicle lenses need to maintain good imaging performance not only in good lighting conditions but also in low-light conditions, such as at night or indoors. Based on these requirements, this application designs a large-aperture glass-plastic surround-view lens that can achieve high resolution while maintaining the advantage of a large aperture. Utility Model Content

[0003] This application aims to provide a large-aperture glass-plastic surround-view vehicle optical system, which has the design advantages of large aperture, high pixel count, and high resolution. It is compact, miniaturized, easy to process and install, and further improves the imaging effect of the equipment used with the system.

[0004] A large-aperture glass-plastic surround-view vehicle optical system comprises, along the optical axis from the object plane to the image plane, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; 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, and its image-side surface is concave. The third lens has negative optical power and its image-side surface is concave. The fourth lens has optical power, and its object-side surface is convex. The fifth lens has positive optical power, and its object side is convex, and its image side is convex. The sixth lens and the seventh lens constitute an adhesive lens.

[0005] The large-aperture glass-plastic surround-view automotive optical system described above satisfies the following relationship: The optical system satisfies the following relationship: -10.0mm <f1<-5.0mm; -7.0mm <f2<-2.5mm; |f3| > 4.0mm; -6.0mm <f4<10.0mm; 2.5mm < |f5| < 6.0mm; 1.5mm < |f6| < 5.0mm; 1.5mm < |f7| < 5.0mm; 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, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.

[0006] For the large-aperture glass-plastic panoramic vehicle-mounted optical system as described above, the optical system satisfies the following relationships: -10.0 < f1 / f < -1.0; -8.0 < f2 / f < -0.5; |f3| / f > 1.0; 0.5 < |f4 / f| < 8.0; 0.5 < |f5 / f| < 5; 0.5 < |f6| / f < 3.0; |f7 / f| > 1.0; Among them, f is the focal length of the entire optical system, 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, and f7 is the focal length of the seventh lens.

[0007] For the large-aperture glass-plastic panoramic vehicle-mounted optical system as described above, the optical system satisfies the following relationship: Aperture 1.5 ≤ Fno ≤ 1.8.

[0008] For the large-aperture glass-plastic panoramic vehicle-mounted optical system as described above, the optical system satisfies the following relationship: Full field of view FOV ∈ [190°, 210°].

[0009] For the large-aperture glass-plastic panoramic vehicle-mounted optical system as described above, the optical system satisfies the following relationship: D1 / (Fno * Ymax) < 3.6; 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.

[0010] For the large-aperture glass-plastic panoramic vehicle-mounted optical system as described above, the optical system satisfies the following relationship: 0.5 < R4 / f < 4.0; where R4 is the image-side curvature of the second lens and f is the total focal length of the optical system.

[0011] For the large-aperture glass-plastic panoramic vehicle-mounted optical system as described above, the optical system satisfies the following relationship: Nd5 < 1.70; where Nd5 is the refractive index of the material of the fifth lens.

[0012] For the large-aperture glass-plastic panoramic vehicle-mounted optical system as described above, the optical system satisfies the following relationship: 2.0 < H / f < 4.5; where H is the image height of the optical system and f is the total focal length of the optical system.

[0013] The large-aperture glass-plastic surround-view automotive optical system described above satisfies the following relationship: TTL / f < 10.5; where f is the total focal length of the optical system and TTL is the total optical length of the optical system.

[0014] As described above, in the large-aperture glass-plastic surround-view automotive optical system, the first and fifth lenses are spherical lenses, and the aperture stop is located between the fourth and fifth lenses.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: This utility model provides a large aperture glass-plastic surround-view vehicle optical system and its application camera module, which is mainly composed of 7 lenses. It has a simple structure and has the advantages of high resolution and large aperture, which improves the uniformity of illumination and image clarity. In addition, the lens has a short TTL, which allows for a wider field of view and reduces the production cost of the large aperture glass-plastic surround-view vehicle lens. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 1 of this application; Figure 2 The field curvature curve and distortion curve of the optical system or camera module in Embodiment 1 of this application; Figure 3 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 2 of this application; Figure 4 The field curvature curve and distortion curve of the optical system or camera module in Embodiment 2 of this application; Figure 5 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 3 of this application; 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

[0018] like Figure 1-6As shown in the figure, the present application provides a large-aperture glass-plastic panoramic vehicle-mounted optical system, which is composed of a first lens, a second lens, a third lens, a fourth lens, an aperture stop, a fifth lens, a sixth lens, and a seventh lens in sequence along the optical axis from the object plane to the image plane; the first lens has a negative focal power, its object side is convex, and its image side is concave; the second lens has a negative focal power, and its image side is concave; the third lens has a concave image side; the fourth lens has a focal power, and its object side is convex; the fifth lens has a positive focal power, its object side is convex, and its image side is convex; the sixth lens and the seventh lens form a cemented lens.

[0019] The utility model provides a large-aperture glass-plastic panoramic vehicle-mounted optical system, which is mainly composed of 7 lenses. It has a simple structure and has the advantages of high resolution, large aperture, etc. It improves the uniformity of the picture illumination and the imaging clarity, and the TTL of the lens is short, the shooting field of view is wider, and the production cost of the large-aperture glass-plastic panoramic vehicle-mounted lens is reduced.

[0020] Furthermore, the optical system satisfies the following relationships: -10.0mm < f1 < -5.0mm; -7.0mm < f2 < -2.5mm; |f3| > 4.0mm; -6.0mm < f4 < 10.0mm; 2.5mm < |f5| < 6.0mm; 1.5mm < |f6| < 5.0mm; 1.5mm < |f7| < 5.0mm; 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, and f7 is the focal length of the seventh lens. By reasonably controlling the focal lengths of each lens of the optical system, while the optical system satisfies a large field angle, it can limit the effective diameter of the components, control the size of the overall optical system, and adjust the light incident angle, which is beneficial to correcting the system aberration.

[0021] Furthermore, the optical system satisfies the following relationships: -10.0 < f1 / f < -1.0; -8.0 < f2 / f < -0.5; |f3| / f > 1.0; 0.5 < |f4 / f| < 8.0; 0.5 < |f5 / f| < 5; 0.5 < |f6| / f < 3.0; |f7 / f| > 1.0; where f is the focal length of the entire optical system, 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, and f7 is the focal length of the seventh lens. The limitation of the ratio of the effective focal lengths of each lens to the focal length of the optical system enables the optical system to obtain a reasonable light deflection angle, effectively reduces the sensitivity of component tolerances, and improves the system aberration.

[0022] Further, the optical system satisfies the following relationship: the system aperture 1.5 ≤ Fno ≤ 1.8, effectively meeting the actual requirements of the large aperture of the optical system.

[0023] Further, the optical system satisfies the following relationship: FOV ∈ [190°, 200°], where FOV is the maximum field angle of the optical system. The design of the large field angle of the optical system effectively meets the actual requirements of the large field of view of the optical system.

[0024] Further, the optical system satisfies the following relationship: D1 / (Fno * Ymax) < 3.6, 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. The limitation of the maximum image circle and aperture size of the optical imaging system can achieve the purpose of limiting the optical effective diameter of the first lens and ensure the miniaturization requirements of the optical system.

[0025] Further, the optical system satisfies the following relationship: 0.5 < R4 / f < 4.0; where R4 is the image-side curvature of the second lens and f is the total focal length of the optical system. Without changing the focal length, by controlling the object-side curvature of the second lens, the light incident in front of the lens can be effectively controlled to enter the third lens, significantly correcting the aberration generated by the front group of lenses, achieving better resolution ability and high resolution.

[0026] Further, the optical system satisfies the following relationship: Nd5 < 1.70; where Nd5 is the refractive index of the material of the fifth lens. The reasonable selection of the refractive index of the lens material 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.

[0027] Further, the optical system satisfies the following relationship: 2.0 < H / f < 4.5; 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.

[0028] Further, the optical system satisfies the following relationship: TTL / f < 10.5; where TTL is the total optical length of the optical system and f is the total focal length of the optical system. The limitation of the ratio of the total optical length to the focal length of the optical system can effectively limit the length of the lens under the condition of a fixed focal length.

[0029] Embodiment 1 The following refers to Figures 1 to 2 Describe the optical imaging lens according to Embodiment 1 of the present application. [[ID=X]] Figure 1 Fig. shows a schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present application.

[0030] 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 fourth lens E4, a STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an imaging plane S17.

[0031] The first lens has negative optical power, with a convex object-side surface and a concave image-side surface; the second lens has negative optical power, with a concave object-side surface and a concave image-side surface; the third lens has positive optical power, with a convex object-side surface and a concave image-side surface; the fourth lens has positive optical power, with a convex object-side surface and a concave image-side surface; the fifth lens has negative optical power, with a convex object-side surface and a convex image-side surface; the sixth lens has positive optical power, with a convex object-side surface and a convex image-side surface; and the seventh lens has negative optical power, with a concave object-side surface and a convex image-side surface. Lenses six and seven form a bonding lens. Filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0032] 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).

[0033] Table 1

[0034] In Table 1, the object-side and image-side surfaces of the second lens E2, the third lens E3, the fourth lens E4, the sixth lens E6, and the seventh lens E7 are all aspherical. The surface shape of these aspherical lenses can be defined using, but is not limited to, the following aspherical formulas:

[0035] 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.

[0036] Table 2

[0037] 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.

[0038] Example 2 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.

[0039] 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 STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an imaging plane S17.

[0040] The first lens has negative optical power, with a convex object-side surface and a concave image-side surface; the second lens has negative optical power, with a convex object-side surface and a concave image-side surface; the third lens has negative optical power, with a convex object-side surface and a concave image-side surface; the fourth lens has positive optical power, with a convex object-side surface and a concave image-side surface; the fifth lens has negative optical power, with a convex object-side surface and a convex image-side surface; the sixth lens has positive optical power, with a convex object-side surface and a convex image-side surface; and the seventh lens has negative optical power, with a concave object-side surface and a convex image-side surface. Lenses six and seven form a bonded lens. Filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0041] 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).

[0042] Table 3

[0043] In Table 3, the object-side and image-side surfaces of the first lens E1, the second lens E2, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are all aspherical. The surface shape of these aspherical lenses can be defined using, but is not limited to, the following aspherical formulas:

[0044] 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.

[0045] Table 4

[0046] 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.

[0047] Example 3 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.

[0048] 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 STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an imaging plane S17.

[0049] 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 negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has negative 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 convex 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 seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0050] 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).

[0051] Table 5

[0052] In Table 5, the object-side and image-side surfaces of the first lens E1, the second lens E2, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are all aspherical. The surface shape of these aspherical lenses can be defined using, but is not limited to, the following aspherical formulas:

[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 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.

[0054] Table 6

[0055] In Examples 1-3, the basic data is as follows: Table 7

[0056] In Examples 1-3, each conditional expression satisfies the conditions in the table below: Table 8

[0057] This utility model provides a large aperture glass-plastic surround view vehicle optical system, which is mainly composed of 7 lenses. It has a simple structure and has the advantages of high resolution and large aperture, which improves the uniformity of illumination and image clarity. In addition, the lens has a short TTL, which allows for a wider field of view and reduces the production cost of the large aperture glass-plastic surround view vehicle lens.

[0058] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of this utility model is limited to these descriptions. Any methods or structures that are similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the protection scope of this utility model.

Images