4-piece ultra-wide-angle lens and electronic device

Abstract

The application provides a 4-piece type ultra-wide-angle lens, which is composed of a first lens, a second lens, a diaphragm, a third lens and a fourth lens arranged in sequence from an object side to an image side along an optical axis direction, and meets the following relationship: f1'>0, f3'<0, f4'>0; -3

Description

Technical Field

[0001] This invention relates to the field of lens technology, and in particular to a 4-element ultra-wide-angle lens and electronic device. Background Technology

[0002] In the fields of machine vision, vehicle surround view, security monitoring, and industrial panoramic inspection, there is a widespread need for large field-of-view fixed-focus lenses. Ultra-wide-angle lenses with a field of view (FOV) of 110 degrees or more can achieve scene information acquisition over a large area. A single frame image can cover a wide monitoring or inspection area, reducing the number of camera deployments and lowering the hardware and construction costs of the entire vision system. They have irreplaceable application advantages in scenarios such as vehicle surround view, equipment panoramic monitoring, and warehouse full-area recognition. In some outdoor, low-light, and non-nighttime extreme application conditions, the pursuit is not for the ultimate large aperture light-gathering capability, but rather for lens optical distortion, relative illumination, imaging consistency, and cost control. Lenses with an aperture value of F-number ≥ 2.0 (e.g., F2.5, F4.6) can effectively reduce the difficulty of lens optical design, reduce the number of lens elements, and compress lens size and material costs while ensuring sufficient light intake. At the same time, it helps to suppress radial distortion caused by ultra-wide-angle lenses, improve relative illumination across the entire field of view, and ensure image edge imaging quality.

[0003] Existing ultra-wide-angle lenses with a field of view of 110 degrees or more mainly fall into two categories. One category consists of large-aperture ultra-wide-angle lenses designed for low-light performance, with aperture values ​​generally less than f / 2.0. To achieve this high light-gathering capability (f / 2.0), these lenses require multiple large-diameter aspherical lens elements. This results in a large number of elements, a large overall lens size, and high material costs. Furthermore, they are prone to severe barrel distortion at ultra-wide angles, leading to significant drops in relative illumination at the corners of the image and noticeable deterioration in edge image quality. For scenarios where extremely high light intake is not required, this represents overkill and wasted cost. The other category comprises conventional small-aperture ultra-wide-angle lenses. While they can achieve f / 2.0 or higher, their optical structures are mostly optimized for fields of view of 90 degrees or less. When the field of view expands to 110 degrees or more, the difficulty of optical aberration correction increases dramatically. Simply reducing the aperture cannot compensate for the distortion, field curvature, and chromatic aberration introduced by ultra-wide-angle lenses, easily resulting in problems such as blurred edges, color shift, and a sharp drop in relative illumination. Existing solutions for improving image quality in fields of view greater than 110 degrees often require increasing the number of lenses, which leads to a contradiction of increased overall lens length and higher costs. Summary of the Invention

[0004] The purpose of this invention is to provide a 4-element ultra-wide-angle lens to solve the problem that existing 4-element ultra-wide-angle lenses cannot simultaneously satisfy a field of view of more than 110 degrees and an aperture of more than 2.0.

[0005] This invention provides a 4-element ultra-wide-angle lens, comprising a first lens, a second lens, an aperture stop, a third lens, and a fourth lens arranged sequentially from the object side to the image side along the optical axis. The image side of the first lens in the optical axis region is concave. The 4-element ultra-wide-angle lens satisfies the following relationship:

[0006] f1'>0, f3'<0, f4'>0;

[0007] -3 <f1' / f3'<-1,-1.5<f3' / f4'<0,-1.5<f' / f1'<0,0<f' / f2'<1,-1<f' / f12'<0,-1<f123' / f4'<0;

[0008] 0.2 <IH / TTL<0.5;

[0009] Wherein, f' is the focal length of the four-element ultra-wide-angle lens, TTL is the distance between the object side and the image plane of the first lens, IH is the half-image height of the four-element ultra-wide-angle lens, the focal lengths of the first lens to the fourth lens are f1', f2', f3', f4', respectively, f12' is the combined focal length of the first lens and the second lens, and f123' is the combined focal length of the first lens, the second lens, and the third lens.

[0010] The aforementioned 4-element ultra-wide-angle lens, through the structure and parameter settings of the first, second, third, and fourth lenses, enables the product to have a field of view range of 110 to 130 degrees and an aperture range of greater than or equal to 2.0, while simultaneously meeting the requirements of a field of view of more than 110 degrees and an aperture value of more than 2.0.

[0011] Furthermore, the refractive index of both the first lens and the third lens is less than 1.6, and the Abbe number of both the first lens and the third lens is greater than 50.

[0012] Furthermore, the fourth lens has a refractive index greater than 1.60 and an Abbe number greater than 18.

[0013] Furthermore, the aperture value of the four-element ultra-wide-angle lens is greater than or equal to 2.0.

[0014] Furthermore, the aforementioned 4-element ultra-wide-angle lens also satisfies the following relationship:

[0015] 0.1 <SAG11 / SAG12<1;

[0016] 0.5 <SAG21 / SAG22<3;

[0017] 0.1 <SAG31 / SAG32<1;

[0018] 5 <SAG41 / SAG42<50;

[0019] Wherein, SAG11 is the sagitta of the object-side surface of the first lens, SAG12 is the sagitta of the image-side surface of the first lens, SAG21 is the sagitta of the object-side surface of the second lens, SAG22 is the sagitta of the image-side surface of the second lens, SAG31 is the sagitta of the object-side surface of the third lens, SAG32 is the sagitta of the image-side surface of the third lens, SAG41 is the sagitta of the object-side surface of the fourth lens, and SAG42 is the sagitta of the image-side surface of the fourth lens.

[0020] Furthermore, the aforementioned 4-element ultra-wide-angle lens also satisfies the following relationship:

[0021] 1.5 <Y11 / Y21<3;

[0022] 0.5 <Y31 / Y41<1.5;

[0023] Wherein, Y11 is the maximum effective radius of the side surface of the first lens, Y21 is the maximum effective radius of the side surface of the second lens, Y31 is the maximum effective radius of the side surface of the third lens, and Y41 is the maximum effective radius of the side surface of the fourth lens.

[0024] Furthermore, the aforementioned 4-element ultra-wide-angle lens also satisfies the following relationship:

[0025] -2 <R1 / R2<0;

[0026] 1 <R3 / R4<8;

[0027] -2 <R5 / R6<0;

[0028] -1 <R7 / R8<0;

[0029] Wherein, R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, R3 is the radius of curvature of the object side of the second lens, R4 is the radius of curvature of the image side of the second lens, R5 is the radius of curvature of the object side of the third lens, R6 is the radius of curvature of the image side of the third lens, R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens.

[0030] Furthermore, the aforementioned 4-element ultra-wide-angle lens also satisfies the following relationship:

[0031] 1.5 <T12 / T3<3.5;

[0032] 0.2 <T1 / T2<1;

[0033] 0.2 <T3 / T4<3;

[0034] 2 <T123 / T4<10;

[0035] Wherein, T1 is the center thickness of the first lens, T2 is the center thickness of the second lens, T3 is the center thickness of the third lens, T4 is the center thickness of the fourth lens, T12 is the combined center thickness of the first lens and the second lens, and T123 is the combined center thickness of the first lens, the second lens, and the third lens.

[0036] Furthermore, the aforementioned 4-element ultra-wide-angle lens also satisfies the following relationship:

[0037] 1 <A12 / A23<8;

[0038] 1 <A12 / A34<15;

[0039] Wherein, A12 is the air gap between the first lens and the second lens, A23 is the air gap between the second lens and the third lens, and A34 is the air gap between the third lens and the fourth lens.

[0040] The present invention also provides an electronic device comprising a four-element ultra-wide-angle lens as described in any of the preceding claims. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of a 4-element ultra-wide-angle lens according to the first embodiment of the present invention;

[0042] Figure 2 for Figure 1 A polychromatic light diffraction modulation transfer function curve of a 4-element ultra-wide-angle lens;

[0043] Figure 3 for Figure 1 A graph showing the field curvature and distortion function curves of a type of 4-element ultra-wide-angle lens;

[0044] Figure 4 This is a schematic diagram of the structure of a 4-element ultra-wide-angle lens according to the second embodiment of the present invention;

[0045] Figure 5 for Figure 4 A polychromatic light diffraction modulation transfer function curve of a 4-element ultra-wide-angle lens;

[0046] Figure 6 for Figure 4 A graph showing the field curvature and distortion function curves of a type of 4-element ultra-wide-angle lens;

[0047] Figure 7 This is a schematic diagram of the structure of a 4-element ultra-wide-angle lens according to the third embodiment of the present invention;

[0048] Figure 8 for Figure 7 A polychromatic light diffraction modulation transfer function curve of a 4-element ultra-wide-angle lens;

[0049] Figure 9 for Figure 7 A graph showing the field curvature and distortion function curves of a type of 4-element ultra-wide-angle lens;

[0050] Figure 10 This is a schematic diagram of the structure of a 4-element ultra-wide-angle lens according to the fourth embodiment of the present invention;

[0051] Figure 11 for Figure 10 A polychromatic light diffraction modulation transfer function curve of a 4-element ultra-wide-angle lens;

[0052] Figure 12 for Figure 10 The field curvature and distortion function curves of a 4-element ultra-wide-angle lens.

[0053] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0054] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0055] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0057] Please see Figures 1 to 3The first embodiment of the present invention provides a four-element ultra-wide-angle lens, which consists of a first lens 11, a second lens 12, an aperture stop, a third lens 13, and a fourth lens 14 arranged sequentially from the object side to the image side along the optical axis. The image side 112 of the optical axis region of the first lens 11 is concave. The four-element ultra-wide-angle lens satisfies the following relationship:

[0058] f1'>0, f3'<0, f4'>0;

[0059] -3 <f1' / f3'<-1,-1.5<f3' / f4'<0,-1.5<f' / f1'<0,0<f' / f2'<1,-1<f' / f12'<0,-1<f123' / f4'<0;

[0060] 0.2 <IH / TTL<0.5;

[0061] Wherein, f' is the focal length of the four-element ultra-wide-angle lens, TTL is the distance between the object side and the image plane of the first lens 11, IH is the half-image height of the four-element ultra-wide-angle lens, the focal lengths of the first lens 11 to the fourth lens 14 are f1', f2', f3', f4', respectively, f12' is the combined focal length of the first lens 11 and the second lens 12, and f123' is the combined focal length of the first lens, the second lens, and the third lens.

[0062] Specifically, in this embodiment, the system parameters and structural parameters of the four-element ultra-wide-angle lens satisfy Table 1, and the aspherical parameters satisfy Table 2.

[0063] Table 1

[0064]

[0065] Table 2

[0066]

[0067] The aforementioned 4-element ultra-wide-angle lens, through the structure and parameter settings of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14, enables the product to achieve a field of view of 120 degrees and an aperture value of 4.6, while simultaneously meeting the requirements of a field of view of over 110 degrees and an aperture value of over 2.0.

[0068] Please see Figures 4 to 6 The second embodiment of the present invention provides a four-element ultra-wide-angle lens, which consists of a first lens 11, a second lens 12, an aperture stop, a third lens 13, and a fourth lens 14 arranged sequentially from the object side to the image side and along the optical axis. The image side 112 of the optical axis region of the first lens 11 is concave.

[0069] Specifically, in this embodiment, the system parameters and structural parameters of the four-element ultra-wide-angle lens satisfy Table 3, and the aspherical parameters satisfy Table 4.

[0070] Table 3

[0071]

[0072] Table 4

[0073]

[0074] The aforementioned 4-element ultra-wide-angle lens, through the structure and parameter settings of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14, enables the product to achieve a field of view of 120 degrees and an aperture value of 2.5, while simultaneously meeting the requirements of a field of view of more than 110 degrees and an aperture value of more than 2.0.

[0075] Please see Figures 7 to 9 The third embodiment of the present invention provides a four-element ultra-wide-angle lens, which consists of a first lens 11, a second lens 12, an aperture stop, a third lens 13, and a fourth lens 14 arranged sequentially from the object side to the image side and along the optical axis. The image side 112 of the optical axis region of the first lens 11 is concave.

[0076] Specifically, in this embodiment, the system parameters and structural parameters of the four-element ultra-wide-angle lens meet the requirements of Table 5, and the aspherical parameters meet the requirements of Table 6.

[0077] Table 5

[0078]

[0079] Table 6

[0080]

[0081] The aforementioned 4-element ultra-wide-angle lens, through the structure and parameter settings of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14, enables the product to achieve a field of view of 130 degrees and an aperture value of 4.6, while simultaneously meeting the requirements of a field of view of over 110 degrees and an aperture value of over 2.0.

[0082] Please see Figures 10 to 12 The fourth embodiment of the present invention provides a four-element ultra-wide-angle lens, which consists of a first lens 11, a second lens 12, an aperture stop, a third lens 13, and a fourth lens 14 arranged sequentially from the object side to the image side and along the optical axis. The image side 112 of the optical axis region of the first lens 11 is concave.

[0083] Specifically, in this embodiment, the system parameters and structural parameters of the four-element ultra-wide-angle lens meet the requirements of Table 7, and the aspherical parameters meet the requirements of Table 8.

[0084] Table 7

[0085]

[0086] Table 8

[0087]

[0088] The aforementioned 4-element ultra-wide-angle lens, through the structure and parameter settings of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14, enables the product to achieve a field of view of 110 degrees and an aperture value of 4.6, simultaneously meeting the requirements of a field of view of more than 110 degrees and an aperture value of more than 2.0.

[0089] In one embodiment of the present invention, the refractive indices of the first lens and the third lens are both less than 1.6, and the Abbe numbers of the first lens 11 and the third lens 13 are greater than 50.

[0090] In one embodiment of the present invention, the fourth lens 14 has a refractive index greater than 1.60 and an Abbe number greater than 18.

[0091] In one embodiment of the present invention, the aperture value of the four-element ultra-wide-angle lens is greater than or equal to 2.0.

[0092] The aforementioned 4-element ultra-wide-angle lens also satisfies the following relationship:

[0093] 0.1 <SAG11 / SAG12<1;

[0094] 0.5 <SAG21 / SAG22<3;

[0095] 0.1 <SAG31 / SAG32<1;

[0096] 5 <SAG41 / SAG42<50;

[0097] Wherein, SAG11 is the sagitta of the object-side surface of the first lens 11, SAG12 is the sagitta of the image-side surface of the first lens 11, SAG21 is the sagitta of the object-side surface of the second lens 12, SAG22 is the sagitta of the image-side surface of the second lens 12, SAG31 is the sagitta of the object-side surface of the third lens 13, SAG32 is the sagitta of the image-side surface of the third lens 13, SAG41 is the sagitta of the object-side surface of the fourth lens 14, and SAG42 is the sagitta of the image-side surface of the fourth lens 14.

[0098] In one embodiment of the present invention, the four-element ultra-wide-angle lens also satisfies the following relationship:

[0099] 1.5 <Y11 / Y21<3;

[0100] 0.5 <Y31 / Y41<1.5;

[0101] Wherein, Y11 is the maximum effective radius of the object side of the first lens 11, Y21 is the maximum effective radius of the object side of the second lens 12, Y31 is the maximum effective radius of the object side of the third lens 13, and Y41 is the maximum effective radius of the object side of the fourth lens 14.

[0102] In one embodiment of the present invention, the four-element ultra-wide-angle lens also satisfies the following relationship:

[0103] -2 <R1 / R2<0;

[0104] 1 <R3 / R4<8;

[0105] -2 <R5 / R6<0;

[0106] -1 <R7 / R8<0;

[0107] Wherein, R1 is the radius of curvature of the object side of the first lens 11, R2 is the radius of curvature of the image side of the first lens 11, R3 is the radius of curvature of the object side of the second lens 12, R4 is the radius of curvature of the image side of the second lens 12, R5 is the radius of curvature of the object side of the third lens 13, R6 is the radius of curvature of the image side of the third lens 13, R7 is the radius of curvature of the object side of the fourth lens 14, and R8 is the radius of curvature of the image side of the fourth lens 14.

[0108] In one embodiment of the present invention, the four-element ultra-wide-angle lens also satisfies the following relationship:

[0109] 1.5 <T12 / T3<3.5;

[0110] 0.2 <T1 / T2<1;

[0111] 0.2 <T3 / T4<3;

[0112] 2 <T123 / T4<10;

[0113] Wherein, T1 is the center thickness of the first lens 11, T2 is the center thickness of the second lens 12, T3 is the center thickness of the third lens 13, T4 is the center thickness of the fourth lens 14, T12 is the combined center thickness of the first lens 11 and the second lens 12, and T123 is the combined center thickness of the first lens 11, the second lens 12, and the third lens 13.

[0114] In one embodiment of the present invention, the four-element ultra-wide-angle lens also satisfies the following relationship:

[0115] 1 <A12 / A23<8;

[0116] 1 <A12 / A34<15;

[0117] Wherein, A12 is the air gap between the first lens 11 and the second lens 12, A23 is the air gap between the second lens 12 and the third lens 13, and A34 is the air gap between the third lens 13 and the fourth lens 14.

[0118] This invention also provides an electronic device, including a 4-element ultra-wide-angle lens as described in any of the above embodiments.

[0119] The aforementioned 4-element ultra-wide-angle lens, through the structure and parameter settings of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14, enables the product's field of view to range from 110 degrees to 130 degrees and the aperture range to be greater than or equal to 2.0, while simultaneously meeting the requirements of a field of view of more than 110 degrees and an aperture value of more than 2.0.

[0120] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A 4-element ultra-wide-angle lens, characterized in that, The lens comprises a first lens, a second lens, an aperture stop, a third lens, and a fourth lens arranged sequentially from the object side to the image side along the optical axis. The image side of the first lens in the optical axis region is concave. The four-element ultra-wide-angle lens satisfies the following relationship: f1'>0, f3'<0, f4'>0; -3 <f1' / f3'<-1,-1.5<f3' / f4'<0,-1.5<f' / f1'<0,0<f' / f2'<1,-1<f' / f12'<0,-1<f123' / f4'<0; 0.2 <IH / TTL<0.5; Wherein, f' is the focal length of the four-element ultra-wide-angle lens, TTL is the distance between the object side and the image plane of the first lens, IH is the half-image height of the four-element ultra-wide-angle lens, the focal lengths of the first lens to the fourth lens are f1', f2', f3', and f4' respectively, f12' is the combined focal length of the first lens and the second lens, and f123' is the combined focal length of the first lens, the second lens, and the third lens.

2. The 4-element ultra-wide-angle lens according to claim 1, characterized in that, The refractive indices of both the first lens and the third lens are less than 1.6, and the Abbe numbers of both the first lens and the third lens are greater than 50.

3. A 4-element ultra-wide-angle lens according to claim 1, characterized in that, The fourth lens has a refractive index greater than 1.60 and an Abbe number greater than 18.

4. A 4-element ultra-wide-angle lens according to claim 1, characterized in that, The aperture value of the aforementioned 4-element ultra-wide-angle lens is greater than or equal to 2.

0.

5. A 4-element ultra-wide-angle lens according to claim 1, characterized in that, The aforementioned 4-element ultra-wide-angle lens also satisfies the following relationship: 0.1 <SAG11 / SAG12<1; 0.5 <SAG21 / SAG22<3; 0.1 <SAG31 / SAG32<1; 5 <SAG41 / SAG42<50; Wherein, SAG11 is the sagitta of the object-side surface of the first lens, SAG12 is the sagitta of the image-side surface of the first lens, SAG21 is the sagitta of the object-side surface of the second lens, SAG22 is the sagitta of the image-side surface of the second lens, SAG31 is the sagitta of the object-side surface of the third lens, SAG32 is the sagitta of the image-side surface of the third lens, SAG41 is the sagitta of the object-side surface of the fourth lens, and SAG42 is the sagitta of the image-side surface of the fourth lens.

6. A 4-element ultra-wide-angle lens according to claim 1, characterized in that, The aforementioned 4-element ultra-wide-angle lens also satisfies the following relationship: 1.5 <Y11 / Y21<3; 0.5 <Y31 / Y41<1.5; Wherein, Y11 is the maximum effective radius of the side surface of the first lens, Y21 is the maximum effective radius of the side surface of the second lens, Y31 is the maximum effective radius of the side surface of the third lens, and Y41 is the maximum effective radius of the side surface of the fourth lens.

7. A 4-element ultra-wide-angle lens according to claim 1, characterized in that, The aforementioned 4-element ultra-wide-angle lens also satisfies the following relationship: -2 <R1 / R2<0; 1 <R3 / R4<8; -2 <R5 / R6<0; -1 <R7 / R8<0; Wherein, R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, R3 is the radius of curvature of the object side of the second lens, R4 is the radius of curvature of the image side of the second lens, R5 is the radius of curvature of the object side of the third lens, R6 is the radius of curvature of the image side of the third lens, R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens.

8. A 4-element ultra-wide-angle lens according to claim 1, characterized in that, The aforementioned 4-element ultra-wide-angle lens also satisfies the following relationship: 1.5 <T12 / T3<3.5; 0.2 <T1 / T2<1; 0.2 <T3 / T4<3; 2 <T123 / T4<10; Wherein, T1 is the center thickness of the first lens, T2 is the center thickness of the second lens, T3 is the center thickness of the third lens, T4 is the center thickness of the fourth lens, T12 is the combined center thickness of the first lens and the second lens, and T123 is the combined center thickness of the first lens, the second lens, and the third lens.

9. A 4-element ultra-wide-angle lens according to claim 1, characterized in that, The aforementioned 4-element ultra-wide-angle lens also satisfies the following relationship: 1 <A12 / A23<8; 1 <A12 / A34<15; Wherein, A12 is the air gap between the first lens and the second lens, A23 is the air gap between the second lens and the third lens, and A34 is the air gap between the third lens and the fourth lens.

10. An electronic device, characterized in that, Including a 4-element ultra-wide-angle lens as described in any one of claims 1-9.

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