Rear view optical lens, camera device and driving tool having the same

Abstract

The utility model provides a rear-view optical lens, a camera device and a driving tool having the same, comprising: a first lens, a second lens, a third lens, a fourth lens and a fifth lens are arranged in sequence from the object side to the image side along the optical axis; the central area of ​​the object side surface of the second lens is convex to the object side, the extension area extending outside the central area of ​​the object side surface of the second lens is concave relative to the central area of ​​the object side surface of the second lens, the extension area extending outside the central area of ​​the image side surface of the second lens is convex to the image side, the central area of ​​the image side surface of the second lens is concave relative to the extension area, and the second lens has a negative optical power; the object side surface of the third lens is a convex structure or a concave structure, the image side surface of the third lens is a convex structure, and the third lens has a positive optical power; the rear-view optical lens has a maximum field of view angle of more than 160 degrees, and has high image quality, a large field of view angle, a small size and low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lenses, and in particular to a rear-view optical lens, a camera device and a driving tool having the same. Background Art

[0002] With the rapid development and widespread use of the automobile industry, users' driving experience is constantly improving, and the requirements for enhanced driving safety and automobile safety are also constantly increasing. Under the trend of integration of smart devices and unmanned driving technology, vehicle-mounted auxiliary vision systems have developed rapidly in the field of automotive electronics. In order to avoid visual blind spots during driving, ultra-rearview lenses have become the first choice for vehicle-mounted cameras. However, vehicle-mounted rearview systems also require high performance indicators to match new technology. Poor picture quality, narrow field of view, large size, high cost, and difficulty in meeting reliability are technical problems that urgently need to be solved.

[0003] The disclosure of the above background technology content is only used to assist in understanding the utility model concept and technical solution of the utility model. It does not necessarily belong to the prior art of this patent application, nor does it necessarily provide technical guidance. In the absence of clear evidence that the above content has been disclosed before the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Utility Model Content

[0004] In order to solve the technical problems of poor image quality, narrow field of view, large size, high cost and difficulty in satisfying reliability of rearview optical lenses, the utility model proposes a rearview optical lens, a camera device and a driving tool having the same, which has a maximum field of view angle of more than 160° and has the characteristics of high image quality, large field of view angle, small size and low cost.

[0005] In order to achieve the above object, the technical solution of the utility model is as follows:

[0006] The utility model provides a rear-view optical lens, comprising: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens are sequentially arranged along the optical axis from the object side to the image side;

[0007] The object side surface of the first lens is a convex surface structure, the image side surface of the first lens is a concave surface structure, and the first lens has a negative optical power;

[0008] The central area of ​​the object side surface of the second lens is convex toward the object side, and the extension area extending outside the central area of ​​the object side surface of the second lens is concave relative to the central area of ​​the object side surface of the second lens.

[0009] An extension region extending outward from the central region of the image side surface of the second lens is convex toward the image side, the central region of the image side surface of the second lens is concave relative to the extension region, and the second lens has negative optical power;

[0010] The object side surface of the third lens is a convex surface structure or a concave surface structure, the image side surface of the third lens is a convex surface structure, and the third lens has a positive optical power;

[0011] The object side surface of the fourth lens is a convex surface structure, the image side surface of the fourth lens is a concave surface structure, and the fourth lens has a negative optical power;

[0012] The object side surface and the image side surface of the fifth lens are both convex structures, and the fifth lens has positive optical power;

[0013] Wherein, the fourth lens and the fifth lens form a cemented lens.

[0014] The utility model provides a rear-view optical lens, the maximum viewing angle of which exceeds 160°, and has the characteristics of high image quality, large viewing angle, small size, low cost and the like.

[0015] As a preferred technical solution, the first lens is a glass spherical lens, the second lens, the third lens, the fourth lens and the fifth lens are all plastic aspherical lenses, and an aperture is provided between the third lens and the fourth lens.

[0016] As a preferred technical solution, the rearview optical lens satisfies the following conditional formula:

[0017] -4.5≤f1 / f≤-3.1;

[0018] -3.9≤f2 / f≤-2.9;

[0019] 2.5≤f3 / f≤3.5;

[0020] -2.2≤f4 / f≤-1.2;

[0021] 1.1≤f5 / f≤1.8;

[0022] Among them, 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 f is the effective focal length of the optical system.

[0023] As a preferred technical solution, the rearview optical lens satisfies the following conditional formula:

[0024] 1.71≤Nd1≤1.88;

[0025] 1.45≤Nd2≤1.71;

[0026] 1.55≤Nd3≤1.68;

[0027] 1.55≤Nd4≤1.68;

[0028] 1.45≤Nd5≤1.71;

[0029] Wherein, Nd1 is the refractive index of the first lens, Nd2 is the refractive index of the second lens, Nd3 is the refractive index of the third lens, Nd4 is the refractive index of the fourth lens, and Nd5 is the refractive index of the fifth lens.

[0030] As a preferred technical solution, the rearview optical lens satisfies the following conditional formula:

[0031] 28≤Vd1≤55;

[0032] 41≤Vd2≤62;

[0033] 18.5≤Vd3≤27.8;

[0034] 18.5≤Vd4≤27.8;

[0035] 41≤Vd5≤62;

[0036] Wherein, Vd1 is the Abbe number of the first lens, Vd2 is the Abbe number of the second lens, Vd3 is the Abbe number of the third lens, Vd4 is the Abbe number of the fourth lens, and Vd5 is the Abbe number of the fifth lens.

[0037] As a preferred technical solution, the rearview optical lens satisfies the following conditional formula:

[0038] 46≤(FOV×f) / h≤54;

[0039] Wherein, FOV is the maximum field of view of the rearview optical lens, and h is the image height corresponding to the maximum field of view.

[0040] As a preferred technical solution, the rearview optical lens satisfies the following conditional formula:

[0041] 2.15≤BFL / f≤2.51;

[0042] Wherein, BFL is the distance from the center of the image side surface of the fifth lens to the imaging surface of the optical system on the optical axis.

[0043] As a preferred technical solution, the rearview optical lens satisfies the following conditional formula:

[0044] 0.21≤BFL / TTL≤0.27;

[0045] Wherein, TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical system on the optical axis.

[0046] On the other hand, the utility model provides a camera device, comprising: an electronic photosensitive element and any one of the rear-view optical lenses described above.

[0047] On the other hand, the utility model provides a driving tool, comprising: the camera device as described above, and the driving tool is a vehicle, a ship, an airplane or a drone.

[0048] The utility model provides a rear-view optical lens, a camera device and a driving tool having the same, which have the following beneficial effects:

[0049] 1) Through the structure of the rear-view optical lens, its maximum field of view angle exceeds 160°, with the characteristics of high image quality, large field of view angle, small size and low cost;

[0050] 2) The first lens is a glass spherical lens, and the second lens, the third lens, the fourth lens and the fifth lens are plastic aspherical lenses. The utility model uses one glass spherical lens and four plastic aspherical lenses, which reduces the cost of the lens;

[0051] 3) The effective focal length of the first lens is f1, the effective focal length of the second lens is f2, the effective focal length of the third lens is f3, the effective focal length of the fourth lens is f4, the effective focal length of the fifth lens is f5, and the effective focal length of the optical system is f, wherein: -4.5≤f1 / f≤-3.1, -3.9≤f2 / f≤-2.9, 2.5≤f3 / f≤3.5, -2.2≤f4 / f≤-1.2, 1.1≤f5 / f≤1.8, the focal length combination realizes a field of view of the rearview optical lens exceeding 160°, and at the same time makes the rearview optical lens have the characteristics of high image quality, large field of view, small size, low cost, etc.;

[0052] 4) The refractive index of the first lens is Nd1, the refractive index of the second lens is Nd2, the refractive index of the third lens is Nd3, the refractive index of the fourth lens is Nd4, and the refractive index of the fifth lens is Nd5, wherein: 1.71≤Nd1≤1.88, 1.45≤Nd2≤1.71, 1.55≤Nd3≤1.68, 1.55≤Nd4≤1.68, 1.45≤Nd5≤1.71, the function of correcting aberrations of the optical lens is realized, the clarity and quality of the image can be significantly improved, and the image quality is improved;

[0053] 5) The Abbe number of the first lens is Vd1, the Abbe number of the second lens is Vd2, the Abbe number of the third lens is Vd3, the Abbe number of the fourth lens is Vd4, and the Abbe number of the fifth lens is Vd5, wherein: 28≤Vd1≤55; 41≤Vd2≤62; 18.5≤Vd3≤27.8; 18.5≤Vd4≤27.8; 41≤Vd5≤62; the function of correcting chromatic aberration of the optical lens is realized, which can significantly improve the color accuracy and clarity of the image and improve the image quality;

[0054] 6) The rearview optical lens satisfies the following condition: 46≤(FOV×f) / h≤54, and the maximum field of view angle exceeds 160°, so that the maximum field of view angle is larger at the same image height, which brings a wider field of view, reduces blind spots, and improves safety and monitoring effects;

[0055] 7) The rear-view optical lens satisfies the following condition: 2.15≤BFL / f≤2.51, so that the rear focal length of the optical lens matches the high-pixel chip and has good assembly performance;

[0056] 8) The rear-view optical lens satisfies the following condition: 0.21≤BFL / TTL≤0.27; the back focus of the lens is constant due to structural reasons, and the smaller the ratio of the back focus of the lens to the total length of the lens is, the more miniaturization it can reflect, thereby realizing the miniaturization of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 A schematic diagram of the structure of a rear-view optical lens provided in Embodiment 1 of the present utility model;

[0058] Figure 2-Figure 8 A schematic diagram of a light fan light curve of a rearview optical lens provided in Embodiment 1 of the utility model;

[0059] Fig. 9 A schematic diagram of field curvature and distortion curves of the rear-view optical lens provided in the first embodiment of the utility model;

[0060] Fig.10 A schematic diagram of a vertical axis aberration curve of a rearview optical lens provided in Embodiment 1 of the utility model;

[0061] Fig.11 A schematic diagram of the MTF curve of the rear-view optical lens provided in the first embodiment of the utility model;

[0062] Fig.12 A schematic diagram of the structure of a rear-view optical lens provided in Embodiment 2 of the present utility model;

[0063] Figure 13-19 A schematic diagram of a light fan light curve of a rearview optical lens provided in Embodiment 2 of the utility model;

[0064] Fig. 20 A schematic diagram of field curvature and distortion curves of a rearview optical lens provided in Embodiment 2 of the present utility model;

[0065] Fig.21 A schematic diagram of a vertical axis aberration curve of a rearview optical lens provided in Embodiment 2 of the present utility model;

[0066] Fig. 22 A schematic diagram of the MTF curve of the rear-view optical lens provided in the second embodiment of the utility model;

[0067] Fig.23 A schematic diagram of the structure of a rear-view optical lens provided in Embodiment 3 of the present utility model;

[0068] Figure 24-30 A schematic diagram of a light fan light curve of a rearview optical lens provided in Embodiment 3 of the present utility model;

[0069] Fig.31 A schematic diagram of the field curvature and distortion curves of the rearview optical lens provided in the third embodiment of the utility model;

[0070] Fig.32 A schematic diagram of a vertical axis aberration curve of a rearview optical lens provided in Embodiment 2 of the present utility model;

[0071] Fig.33 A schematic diagram of the MTF curve of the rear-view optical lens provided in the third embodiment of the present utility model;

[0072] Among them, L1 is the first lens; L2 is the second lens; L3 is the third lens; L4 is the fourth lens; L5 is the fifth lens; L6 is the filter; L7 is the protective glass; and L8 is the image plane. DETAILED DESCRIPTION

[0073] The preferred embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0074] Embodiment 1

[0075] like Figure 1 As shown, the utility model provides an optical lens, comprising: a first lens L1, a second lens L2, a third lens L3, an aperture, a fourth lens L4, a fifth lens L5, a filter L6, a protective glass L7 and an image plane L8 are sequentially arranged along the optical axis from the object side to the image side;

[0076] The object-side surface of the first lens L1 is convex, the image-side surface of the first lens L1 is concave, and the first lens L1 has negative optical power; the central area of ​​the object-side surface of the second lens L2 is convex toward the object side, the extension area extending outward from the central area of ​​the object-side surface of the second lens L2 is concave relative to the central area of ​​the object-side surface of the second lens L2, the extension area extending outward from the central area of ​​the image-side surface of the second lens L2 is convex toward the image side, and the central area of ​​the image-side surface of the second lens L2 is concave relative to the extension area The second lens L2 has a negative optical power; the object side surface of the third lens L3 is a concave surface structure, the image side surface of the third lens L3 is a convex surface structure, and the third lens L3 has a positive optical power; the object side surface of the fourth lens L4 is a convex surface structure, the image side surface of the fourth lens L4 is a concave surface structure, and the fourth lens L4 has a negative optical power; the object side surface and the image side surface of the fifth lens L5 are both convex structures, and the fifth lens L5 has a positive optical power; wherein the fourth lens L4 and the fifth lens L5 form a cemented lens.

[0077] Through the structure of the above-mentioned rearview optical lens, its maximum field of view angle exceeds 160°, and it has the characteristics of high image quality, large field of view angle, small size and low cost.

[0078] Parameters of the optical lens provided in Example 1 are as shown in Table 1 below, wherein f1 is the effective focal length of the first lens L1, f2 is the effective focal length of the second lens L2, f3 is the effective focal length of the third lens L3, f4 is the effective focal length of the fourth lens L4, and f5 is the effective focal length of the fifth lens L5;

[0079] Table 1 Parameters of the rearview optical lens provided in Example 1

[0080]

[0081] From Table 1, we can see that the rearview optical lens provided in Example 1 satisfies the following conditional formula: -4.5≤f1 / f≤-3.1; -3.9≤f2 / f≤-2.9; 2.5≤f3 / f≤3.5; -2.2≤f4 / f≤-1.2; 1.1≤f5 / f≤1.8; the focal length is matched to achieve a field of view angle of the rearview optical lens exceeding 160°, and at the same time, the rearview optical lens has the characteristics of high image quality, large field of view angle, small size, low cost, etc. The design values ​​of the optical lens provided in Example 1 are as shown in Table 2:

[0082] Table 2 Design values ​​of rearview optical lens provided in Example 1

[0083]

[0084]

[0085] From Table 2, we can observe that the rearview optical lens provided in Example 1 satisfies the following conditional formula: 1.71≤Nd1≤1.88; 1.45≤Nd2≤1.71; 1.55≤Nd3≤1.68; 1.55≤Nd4≤1.68; 1.45≤Nd5≤1.71; wherein Nd1 is the refractive index of the first lens L1, Nd2 is the refractive index of the second lens L2, Nd3 is the refractive index of the third lens L3, Nd4 is the refractive index of the fourth lens L4, and Nd5 is the refractive index of the fifth lens L5, thus realizing the function of correcting aberrations of the optical lens, significantly improving the clarity and quality of the image, and improving the image quality;

[0086] From Table 2, we observe that the rearview optical lens provided in Example 1 satisfies the following conditional formulas: 28≤Vd1≤55; 41≤Vd2≤62; 18.5≤Vd3≤27.8; 18.5≤Vd4≤27.8; 41≤Vd5≤62; wherein Vd1 is the Abbe number of the first lens L1, Vd2 is the Abbe number of the second lens L2, Vd3 is the Abbe number of the third lens L3, Vd4 is the Abbe number of the fourth lens L4, and Vd5 is the Abbe number of the fifth lens L5, which realizes the function of correcting chromatic aberration of the optical lens, can significantly improve the color accuracy and clarity of the image, and improve the image quality;

[0087] The surface numbers in Table 2 are numbered according to the order of the surfaces of each lens, where "S1" represents the object side of the first lens, "S2" represents the back surface of the first lens, and so on; the radius of curvature represents the curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, where "PL" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and a blank represents that the current position is air and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to the light, and a blank represents that the current position is air; the k value represents the numerical value of the best fitting cone coefficient of the aspheric surface;

[0088] The aspheric cone coefficient can be defined by the following aspheric formula, but is not limited to the following representation method:

[0089]

[0090] Wherein, z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitted spherical surface, which is the inverse of the radius of curvature; k is the fitted cone coefficient; AI is the coefficient of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspheric polynomial; the design values ​​of the aspheric coefficients in the rearview optical lens provided in Example 1 are as shown in Table 3 below:

[0091] Table 3 Design values ​​of aspheric coefficients in rearview optical lenses

[0092] Surface number S3 S4 S5 S6 S8 S9 S10 A 0.014 0.067 -0.011 0.037 0.076 0.249 -0.070 B -2.533E-003 -4.932E-03 -2.510E-04 -9.017E-03 -0.068 -0.325 0.057 C 1.766E-004 1.481E-04 -2.414E-04 2.792E-03 0.048 0.142 -0.029 D -7.490E-006 1.135E-04 -2.889E-05 -4.222E-04 -0.031 -0.03 9.115E-03 E -6.453E-008 -3.590E-05 1.062E-05 3.987E-05 0.012 -9.962E-04 -5.944E-04 F 0 0 0 0 0 0 0 G 0 0 0 0 0 0 0

[0093] The optical information table of the rearview optical lens provided in Example 1 is as shown in Table 4 below, wherein FOV is the maximum field of view angle of the optical lens, h is the image height corresponding to the maximum field of view angle, f is the effective focal length of the optical system, BFL is the distance from the center of the image side surface of the fifth lens L5 to the imaging surface of the optical system on the optical axis, TTL is the distance from the center of the object side surface of the first lens L1 to the imaging surface of the optical system on the optical axis, and D is the maximum optical effective aperture of the first lens L1;

[0094] Table 4 Optical information table of the optical lens provided in Example 1

[0095]

[0096]

[0097] From Table 4, we can see that the rearview optical lens provided in Example 1 satisfies the following conditional formula: 46≤(FOV×f) / h≤54, achieving a larger maximum field of view angle at the same image height, bringing a wider field of view, reducing blind spots, and improving safety and monitoring effects;

[0098] From Table 4, we observe that the optical lens provided in Example 1 satisfies the following conditional formula: 2.15≤BFL / f≤2.51, so that the back focal length of the optical lens matches the high-pixel chip and has good assembly performance;

[0099] From Table 4, we observe that the optical lens provided in Example 1 satisfies the following conditional formula: 0.21≤BFL / TTL≤0.27, thus achieving miniaturization of the optical lens;

[0100] From Table 4, we can see that the maximum optical effective aperture of the first lens L1 of the optical lens provided in Example 1 is 10.58, achieving a small aperture of the optical lens.

[0101] Figure 2-Figure 8This is a schematic diagram of the light fan curve of the rearview optical lens provided in Example 1, in which the horizontal axis is the normalized beam aperture and the vertical axis is the vertical axis aberration. Ideally, each curve should completely coincide with the horizontal axis, and all light rays in the field of view are focused on the same point on the image plane; the vertical axis in the image can also be expressed as the maximum dispersion range of the light beam on the ideal image plane. The light fan ray diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the magnitude of the vertical axis chromatic aberration. Figure 2 The maximum scaling ratio is ±40μm. Figure 2-Figure 8 It can be seen that the rearview optical lens is close to the horizontal axis at each wavelength in each field of view, indicating that the vertical axis aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously scattered, indicating that the rearview optical lens also has good correction of chromatic aberration, ensuring the imaging requirements of the rearview optical lens for full-band clear images.

[0102] Fig. 9 The figure shows the field curvature and distortion curve of the rearview optical lens provided in the first embodiment. In the left coordinate system of the figure, the horizontal coordinate represents the field curvature of the large field of view vehicle-mounted rearview optical lens, in units of mm; the vertical coordinate represents the normalized image height, with 0 representing the optical axis; in the right coordinate system, the horizontal coordinate represents the distortion (F-Tan), in units of %; the vertical coordinate represents the normalized image height. Fig. 9 It can be seen that the field curvature of different wavelengths is within ±0.1mm, indicating that the field curvature of the rearview optical lens is effectively controlled. At the same time, the distortion (F-Tan) curves of each wavelength coincide, indicating that the distortion of the rearview optical lens at each wavelength is well controlled, and a good linear relationship is obtained between the image height and the field of view angle.

[0103] Fig.10 The vertical axis aberration curve diagram of the rearview optical lens provided in Example 1 is shown. The vertical direction represents the normalization of the aperture, 0 represents the optical axis, and the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). Different linear curves in the figure represent different wavelengths of system imaging, which are represented by Fig.12 It can be seen that the vertical axis aberration of different wavelengths is controlled within the range of ±0.1mm, indicating that the spherical aberration of the rearview optical lens at each wavelength is well controlled.

[0104] Fig.11 The MTF curve diagram of the rearview optical lens provided in the first embodiment is shown, wherein the MTF can represent the comprehensive imaging quality of the vehicle-mounted OMS optical lens. The higher the MTF value, the clearer the image. Fig.11 As shown in the figure, the horizontal coordinate represents the spatial frequency, the unit is lp / mm; the vertical coordinate represents the normalized MTF (OTF coefficient), without unit; T represents meridian, S represents arc loss; different lines represent different fields of view. Fig.11It can be seen that the rearview optical lens has good imaging quality within the field of view.

[0105] Embodiment 2

[0106] like Fig.12 As shown, the utility model provides an optical lens, comprising: a first lens L1, a second lens L2, a third lens L3, an aperture, a fourth lens L4, a fifth lens L5, a filter L6, a protective glass L7 and an image plane L8 are sequentially arranged along the optical axis from the object side to the image side.

[0107] The object-side surface of the first lens L1 is convex, the image-side surface of the first lens L1 is concave, and the first lens L1 has negative optical power; the central area of ​​the object-side surface of the second lens L2 is convex toward the object side, the extension area extending outward from the central area of ​​the object-side surface of the second lens L2 is concave relative to the central area of ​​the object-side surface of the second lens L2, the extension area extending outward from the central area of ​​the image-side surface of the second lens L2 is convex toward the image side, and the central area of ​​the image-side surface of the second lens L2 is concave relative to the extension area structure, the second lens L2 has negative power; the object side surface of the third lens L3 is convex, the image side surface of the third lens L3 is convex, and the third lens L3 has positive power; the object side surface of the fourth lens L4 is convex, the image side surface of the fourth lens L4 is concave, and the fourth lens L4 has negative power; the object side surface and the image side surface of the fifth lens L5 are both convex, and the fifth lens L5 has positive power; wherein the fourth lens L4 and the fifth lens L5 form a cemented lens;

[0108] Through the structure of the above-mentioned rearview optical lens, its maximum field of view angle exceeds 160°, and it has the characteristics of high image quality, large field of view angle, small size and low cost.

[0109] The parameters of the optical lens provided in the second embodiment are shown in Table 5 below, wherein the specific definitions of the parameters refer to the first embodiment and are not repeated here;

[0110] Table 5 Parameters of the optical lens provided in Example 2

[0111]

[0112] From Table 5, we can observe that the rearview optical lens provided in Example 1 satisfies the following conditional formulas: -4.5≤f1 / f≤-3.1; -3.9≤f2 / f≤-2.9; 2.5≤f3 / f≤3.5; -2.2≤f4 / f≤-1.2; 1.1≤f5 / f≤1.8; The focal length is matched to achieve a field of view of the rearview optical lens of more than 160°, and at the same time, the rearview optical lens has the characteristics of high image quality, large field of view, small size, low cost, etc.

[0113] The design values ​​of the rearview optical lens provided in Example 2 are shown in Table 6 below:

[0114] Table 6 Design values ​​of rearview optical lens provided in Example 2

[0115]

[0116]

[0117] From Table 6, we can observe that the rearview optical lens provided in Example 2 satisfies the following conditional formula: 1.71≤Nd1≤1.88; 1.45≤Nd2≤1.71; 1.55≤Nd3≤1.68; 1.55≤Nd4≤1.68; 1.45≤Nd5≤1.71; wherein Nd1 is the refractive index of the first lens L1, Nd2 is the refractive index of the second lens L2, Nd3 is the refractive index of the third lens L3, Nd4 is the refractive index of the fourth lens L4, and Nd5 is the refractive index of the fifth lens L5, which realizes the function of correcting aberrations of the optical lens, can significantly improve the clarity and quality of the image, and improve the image quality;

[0118] From Table 6, we observe that the rearview optical lens provided in Example 2 satisfies the following conditional formula: 28≤Vd1≤55; 41≤Vd2≤62; 18.5≤Vd3≤27.8; 18.5≤Vd4≤27.8; 41≤Vd5≤62; wherein Vd1 is the Abbe number of the first lens L1, Vd2 is the Abbe number of the second lens L2, Vd3 is the Abbe number of the third lens L3, Vd4 is the Abbe number of the fourth lens L4, and Vd5 is the Abbe number of the fifth lens L5; wherein, the specific definition of the parameters can be referred to in Example 1, which will not be repeated here, and the function of correcting chromatic aberration of the optical lens is realized, which can significantly improve the color accuracy and clarity of the image, and improve the image quality;

[0119] For the specific definitions in Table 6, please refer to Example 1 and will not be repeated here;

[0120] Please refer to the first embodiment for the definition of the aspheric cone coefficient, which will not be repeated here; the design values ​​of the aspheric coefficients in the rearview optical lens provided in the second embodiment are as shown in Table 7:

[0121] Table 7 Design values ​​of aspheric coefficients in optical lenses

[0122]

[0123]

[0124] The optical information table of the optical lens provided in the second embodiment is shown in Table 8 below, wherein the specific definitions of the parameters refer to the first embodiment and will not be repeated here;

[0125] Table 8 Optical information table of the optical lens provided in Example 2

[0126] D 10.92 FOV 177.91 f 1.28 TTL 13.16 BFL 3.17 h 4.80 (FOV×f) / h 47.44 BFL / f 2.48 BFL / TTL 0.24

[0127] From Table 8, we observe that the rearview optical lens provided in Example 2 satisfies the following conditional formula: 46≤(FOV×f) / h≤54, achieving a larger maximum field of view angle at the same image height, bringing a wider field of view, reducing blind spots, and improving safety and monitoring effects;

[0128] From Table 8, we observe that the rear-view optical lens provided in Example 2 satisfies the following conditional formula: 2.15≤BFL / f≤2.51, so that the rear focal length of the rear-view optical lens matches the high-pixel chip and has good assembly performance;

[0129] From Table 8, we observe that the rearview optical lens provided in Example 2 satisfies the following conditional formula: 0.21≤BFL / TTL≤0.27, thereby achieving miniaturization of the rearview optical lens;

[0130] From Table 8, we can see that the maximum optical effective aperture of the first lens L1 of the rearview optical lens provided in Example 2 is 10.92, which realizes the small aperture of the rearview optical lens.

[0131] Figure 13-Figure 19 The schematic diagram of the light fan curve of the optical lens provided in the second embodiment is shown. For the specific definition, please refer to the first embodiment and will not be repeated here. Figure 13-Figure 19 It can be seen that the rearview optical lens is close to the horizontal axis at each wavelength in each field of view, indicating that the vertical axis aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously scattered, indicating that the rearview optical lens also has good correction for chromatic aberration, ensuring the imaging requirements of the rearview optical lens for clear images in the full band.

[0132] Fig. 20 The following is a schematic diagram of the field curvature and distortion curve of the rear-view optical lens provided in the second embodiment. For specific definitions, please refer to the first embodiment and will not be repeated here. Fig. 20 It can be seen that the field curvature of different wavelengths is within ±0.1mm, indicating that the field curvature of the rearview optical lens is effectively controlled. At the same time, the distortion (F-Tan) curves of each wavelength coincide, indicating that the distortion of the rearview optical lens at each wavelength is well controlled, and a good linear relationship is obtained between the image height and the field of view angle.

[0133] Fig.21The vertical axis aberration curve diagram of the rear view optical lens provided in the second embodiment is shown in FIG. 1 . For the specific definition, please refer to the first embodiment and will not be described in detail here. Fig.21 It can be seen that the vertical axis aberration of different wavelengths is controlled within the range of ±0.05mm, indicating that the spherical aberration of the rearview optical lens at each wavelength is well controlled.

[0134] Fig. 22 This is a schematic diagram of the MTF curve of the optical lens provided in Example 2. For specific definitions, please refer to Example 1 and will not be repeated here. Fig. 22 It can be seen that the rearview optical lens has good imaging quality within the field of view.

[0135] Embodiment 3

[0136] like Fig.23 As shown, this embodiment provides an optical lens, comprising: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture, a fifth lens L5, a filter L6, a protective glass L7 and an image plane L8 are sequentially arranged along the optical axis from the object side to the image side;

[0137] The object-side surface of the first lens L1 is convex, the image-side surface of the first lens L1 is concave, and the first lens L1 has negative power; the central area of ​​the object-side surface of the second lens L2 is convex toward the object side, the extension area extending outward from the central area of ​​the object-side surface of the second lens L2 is concave relative to the central area of ​​the object-side surface of the second lens L2, the extension area extending outward from the central area of ​​the image-side surface of the second lens L2 is convex toward the image side, and the central area of ​​the image-side surface of the second lens L2 is concave relative to the extension area The second lens L2 has a negative optical power; the object side surface of the third lens L3 is a convex surface structure, the image side surface of the third lens L3 is a convex surface structure, and the third lens L3 has a positive optical power; the object side surface of the fourth lens L4 is a convex surface structure, the image side surface of the fourth lens L4 is a concave surface structure, and the fourth lens L4 has a negative optical power; the object side surface and the image side surface of the fifth lens L5 are both convex structures, and the fifth lens L5 has a positive optical power; wherein the fourth lens L4 and the fifth lens L5 form a cemented lens.

[0138] Through the structure of the above-mentioned rearview optical lens, its maximum field of view angle exceeds 160°, and it has the characteristics of high image quality, large field of view angle, small size and low cost.

[0139] The parameters of the rearview optical lens provided in the third embodiment are shown in Table 9 below, wherein the specific definitions of the parameters refer to the first embodiment and will not be repeated here;

[0140] Table 9 Parameters of the rearview optical lens provided in Example 3

[0141]

[0142] From Table 9, we can see that the rearview optical lens provided in Example 3 satisfies the following conditional formulas: -4.5≤f1 / f≤-3.1; -3.9≤f2 / f≤-2.9; 2.5≤f3 / f≤3.5; -2.2≤f4 / f≤-1.2; 1.1≤f5 / f≤1.8;

[0143] The focal length combination enables the rearview optical lens to have a field of view of more than 160°, and at the same time, the rearview optical lens has the characteristics of high image quality, large field of view, small size and low cost;

[0144] The design values ​​of the rearview optical lens provided in Example 3 are shown in Table 10 below:

[0145] Table 10 Design values ​​of rearview optical lens provided in Example 3

[0146]

[0147]

[0148] From Table 10, we observe that the rearview optical lens provided in Example 3 satisfies the following conditional formula: 1.71≤Nd1≤1.88; 1.45≤Nd2≤1.71; 1.55≤Nd3≤1.68; 1.55≤Nd4≤1.68; 1.45≤Nd5≤1.71; wherein, Nd1 is the refractive index of the first lens L1, Nd2 is the refractive index of the second lens L2, Nd3 is the refractive index of the third lens L3, Nd4 is the refractive index of the fourth lens L4, and Nd5 is the refractive index of the fifth lens L5, thus realizing the function of correcting aberrations of the optical lens, significantly improving the clarity and quality of the image, and improving the image quality.

[0149] From Table 10, we observe that the rearview optical lens provided in Example 3 satisfies the following conditional formulas: 28≤Vd1≤55; 41≤Vd2≤62; 18.5≤Vd3≤27.8; 18.5≤Vd4≤27.8; 41≤Vd5≤62; wherein Vd1 is the Abbe number of the first lens L1, Vd2 is the Abbe number of the second lens L2, Vd3 is the Abbe number of the third lens L3, Vd4 is the Abbe number of the fourth lens L4, and Vd5 is the Abbe number of the fifth lens L5, which realizes the function of correcting chromatic aberration of the optical lens, can significantly improve the color accuracy and clarity of the image, and improve the image quality;

[0150] For the specific definitions in Table 10, please refer to Example 1 and will not be repeated here;

[0151] Please refer to Example 1 for the definition of the aspheric cone coefficient, which will not be repeated here; the design values ​​of the aspheric coefficients in the optical lens provided in Example 3 are as shown in Table 11:

[0152] Table 11 Design values ​​of aspheric coefficients in optical lenses

[0153]

[0154]

[0155] The optical information table of the optical lens provided in the third embodiment is as shown in Table 12 below, wherein the specific definitions refer to the first embodiment and will not be repeated here;

[0156] Table 12 Optical information table of the optical lens provided in Example 3

[0157] D 9.82 FOV 177.55 F 1.33 TTL 13.16 BFL 3.15 H 4.80 (FOV×f) / h 49.2 BFL / f 2.36 BFL / TTL 0.24

[0158] From Table 12, we observe that the optical lens provided in Example 3 satisfies the following conditional formula: 46≤(FOV×f) / h≤54, achieving a larger maximum field of view angle at the same image height, bringing a wider field of view, reducing blind spots, and improving safety and monitoring effects;

[0159] From Table 12, we observe that the rear-view optical lens provided in Example 3 satisfies the following conditional formula: 2.15≤BFL / f≤2.51, so that the rear focal length of the optical lens matches the high-pixel chip and has good assembly performance;

[0160] From Table 12, we observe that the rearview optical lens provided in Example 3 satisfies the following conditional formula: 0.21≤BFL / TTL≤0.27, thereby achieving miniaturization of the rearview optical lens;

[0161] From Table 12, we can see that the maximum optical effective aperture of the first lens L1 of the optical lens provided in Example 3 is 9.82, achieving a small aperture of the optical lens.

[0162] Figure 24-Figure 30 The schematic diagram of the light fan curve of the rearview optical lens provided in the third embodiment is shown. For the specific definition, please refer to the first embodiment and will not be repeated here. Figure 24-Figure 30 It can be seen that the rearview optical lens is close to the horizontal axis at each wavelength in each field of view, indicating that the vertical axis aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously scattered, indicating that the rearview optical lens also has good correction for chromatic aberration, ensuring the imaging requirements of the rearview optical lens for clear images in the full band.

[0163] Fig.31The field curvature and distortion curves of the optical lens provided in the third embodiment are schematic diagrams. For specific definitions, please refer to the first embodiment and will not be repeated here. Fig.31 It can be seen that the field curvature of different wavelengths is within ±0.1mm, indicating that the field curvature of the rearview optical lens is effectively controlled. At the same time, the distortion (F-Tan) curves of each wavelength coincide, indicating that the distortion of the rearview optical lens at each wavelength is well controlled, and a good linear relationship is obtained between the image height and the field of view angle.

[0164] Fig.32 This is a schematic diagram of the vertical axis aberration curve of the optical lens provided in Example 3. For specific definitions, please refer to Example 1 and will not be repeated here. Fig.32 It can be seen that the vertical axis aberration of different wavelengths is controlled within the range of ±0.05mm, indicating that the spherical aberration of the rearview optical lens at each wavelength is well controlled.

[0165] Fig.33 This is a schematic diagram of the MTF curve of the optical lens provided in Example 3. For specific definitions, please refer to Example 1 and will not be repeated here. Fig.33 It can be seen that the rearview optical lens has good imaging quality within the field of view.

[0166] It can be understood that the utility model is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the utility model. In addition, under the teachings of the utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed herein, and all various changes or equivalent substitutions falling within the scope of the claims of the present application are included. In addition, under the teachings of the utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope protected by the utility model.

Claims

1. A rear-view optical lens, characterized in that: include: A first lens, a second lens, a third lens, a fourth lens, and a fifth lens are sequentially arranged along the optical axis from the object side to the image side; The object side surface of the first lens is a convex surface structure, the image side surface of the first lens is a concave surface structure, and the first lens has a negative optical power; The central area of ​​the object side surface of the second lens is convex toward the object side, and the extension area extending outside the central area of ​​the object side surface of the second lens is concave relative to the central area of ​​the object side surface of the second lens. An extension region extending outward from the central region of the image side surface of the second lens is convex toward the image side, the central region of the image side surface of the second lens is concave relative to the extension region, and the second lens has negative optical power; The object side surface of the third lens is a convex surface structure or a concave surface structure, the image side surface of the third lens is a convex surface structure, and the third lens has a positive optical power; The object side surface of the fourth lens is a convex surface structure, the image side surface of the fourth lens is a concave surface structure, and the fourth lens has a negative optical power; The object side surface and the image side surface of the fifth lens are both convex structures, and the fifth lens has positive optical power; Wherein, the fourth lens and the fifth lens form a cemented lens.

2. The rearview optical lens according to claim 1, characterized in that: The first lens is a glass spherical lens, the second lens, the third lens, the fourth lens and the fifth lens are all plastic aspherical lenses, and a stop is provided between the third lens and the fourth lens.

3. The rearview optical lens according to claim 1, characterized in that: The rearview optical lens satisfies the following conditional formula: -4.5≤f1 / f≤-3.1; -3.9≤f2 / f≤-2.9; 2.5≤f3 / f≤3.5; -2.2≤f4 / f≤-1.2; 1.1≤f5 / f≤1.8; Among them, 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 f is the effective focal length of the optical system.

4. The rearview optical lens according to claim 1, characterized in that: The rearview optical lens satisfies the following conditional formula: 1.71≤Nd1≤1.88; 1.45≤Nd2≤1.71; 1.55≤Nd3≤1.68; 1.55≤Nd4≤1.68; 1.45≤Nd5≤1.71; Wherein, Nd1 is the refractive index of the first lens, Nd2 is the refractive index of the second lens, Nd3 is the refractive index of the third lens, Nd4 is the refractive index of the fourth lens, and Nd5 is the refractive index of the fifth lens.

5. The rearview optical lens according to claim 1, characterized in that: The rearview optical lens satisfies the following conditional formula: 28≤Vd1≤55; 41≤Vd2≤62; 18.5≤Vd3≤27.8; 18.5≤Vd4≤27.8; 41≤Vd5≤62; Wherein, Vd1 is the Abbe number of the first lens, Vd2 is the Abbe number of the second lens, Vd3 is the Abbe number of the third lens, Vd4 is the Abbe number of the fourth lens, and Vd5 is the Abbe number of the fifth lens.

6. The rearview optical lens according to claim 3, characterized in that: The rearview optical lens satisfies the following conditional formula: 46≤(FOV×f) / h≤54; Wherein, FOV is the maximum field of view of the rearview optical lens, and h is the image height corresponding to the maximum field of view.

7. The rearview optical lens according to claim 3, characterized in that: The rearview optical lens satisfies the following conditional formula: 2.15≤BFL / f≤2.51; Wherein, BFL is the distance from the center of the image side surface of the fifth lens to the imaging surface of the optical system on the optical axis.

8. The rearview optical lens according to claim 7, characterized in that: The rearview optical lens satisfies the following conditional formula: 0.21≤BFL / TTL≤0.27; Wherein, TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical system on the optical axis.

9. A camera device, characterized in that: include: An electronic photosensitive element and a rearview optical lens as claimed in any one of claims 1 to 8.

10. A driving tool, characterized in that: include: According to the camera device as described in claim 9, the driving tool is a vehicle, a ship, an airplane or a drone.

Images