Day and night confocal wide-angle lens

Abstract

The application provides a day-and-night confocal wide-angle lens, which comprises, from an object side to an image side and in sequence along an optical axis direction, a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens and a filter; the day-and-night confocal wide-angle lens satisfies the following relationship: f1'<0, f2'>0, f3'>0, f4'<0, f5'>0, f6'<0; 0.15

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wide-angle lenses, in particular to a day and night confocal wide-angle lens. BACKGROUND

[0002] The day and night confocal imaging device refers to an imaging system that can clearly image in the day and at night. In the day, the working spectrum of the imaging system is the visible spectrum, and at night, the working spectrum is the near-infrared spectrum. Generally, due to the change of refractive index with wavelength, the image plane positions of the visible light band and the near-infrared band are inconsistent, resulting in imaging blur, poor imaging quality and other problems. Therefore, the day and night confocal imaging device requires an optical lens that can clearly image in the visible spectrum and the near-infrared spectrum.

[0003] The existing day and night confocal lens has poor day and night confocal effect and too small field of view, which cannot meet higher requirements. SUMMARY

[0004] The purpose of the present application is to provide a day and night confocal wide-angle lens to solve the problem of too small field of view of the existing day and night confocal lens.

[0005] The present application provides a day and night confocal wide-angle lens, comprising a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens and a filter arranged in order along the optical axis from the object side to the image side. The object side surface of the optical axis region of the first lens is a convex surface, and the image side surface is a concave surface. The object side surface of the optical axis region of the second lens is a concave surface, and the image side surface is a convex surface. The object side surface of the optical axis region of the third lens is a convex surface, and the image side surface is a convex surface. The object side surface of the optical axis region of the fourth lens is a concave surface, and the image side surface is a concave surface. The object side surface of the optical axis region of the fifth lens is a convex surface, and the image side surface is a convex surface. The day and night confocal wide-angle lens satisfies the following relationship:

[0006] f1'<0, f2'>0, f3'>0, f4'<0, f5'>0, f6'<0;

[0007] 0.15<IH / TTL<0.3;

[0008] -1.3<f1' / f3'<-1.2, -1.6<f1' / f5'<-1.8, 0<f' / f12'<0.1, 0.2<f' / f3456'<0.6, 20<f12' / f3456'<140;

[0009] Wherein, f' is the focal length of the day and night confocal wide-angle lens, TTL is the distance between the object side of the first lens and the image plane, IH is the half image height of the day and night confocal wide-angle lens, the focal lengths of the first lens to the sixth lens are f1', f2', f3', f4', f5', f6' respectively, f12' is the combined focal length of the first lens and the second lens, and f3456' is the combined focal length of the third lens, the fourth lens, the fifth lens and the sixth lens.

[0010] The day and night confocal wide-angle lens has a field of view angle of 160 to 180 through the structure and parameter setting of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, greatly improving the field of view angle of the product.

[0011] Further, the refractive index of the first lens is greater than 1.50, and the Abbe number is greater than 40.

[0012] Further, the refractive index of the second lens, the fourth lens and the sixth lens is greater than 1.60, and the Abbe number is greater than 25.

[0013] Further, the refractive index of the fifth lens is greater than 1.50, and the Abbe number is greater than 40.

[0014] Further, the day and night confocal wide-angle lens has an aperture number greater than or equal to 1.8.

[0015] Further, the day and night confocal wide-angle lens also satisfies the following relationship:

[0016] 1.2<SAG11 / SAG22<2.5, 1.5<SAG52 / SAG62<2.6;

[0017] Wherein, SAG11 is the axial distance between the intersection of the object side of the first lens and the optical axis and the effective radius vertex of the object side of the first lens, SAG22 is the axial distance between the intersection of the object side of the second lens and the optical axis and the effective radius vertex of the image side of the second lens, SAG52 is the axial distance between the intersection of the image side of the fifth lens and the optical axis and the effective radius vertex of the image side of the fifth lens, and SAG62 is the axial distance between the intersection of the image side of the sixth lens and the optical axis and the effective radius vertex of the object image of the sixth lens.

[0018] Further, the second lens to the sixth lens are all even aspheric plastic lenses, which satisfy the following relationship:

[0019] 0.05≤AT4 / T5≤0.1;

[0020] 1.4<T12 / T3456<1.8;

[0021] 0.5 < T12 / TTL < 0.6;

[0022] 0.7 ≤ T1 / T5 ≤ 1.5;

[0023] wherein AT4 is an air gap between the fourth lens and the fifth lens, T1 is a center thickness of the first lens, T5 is a center thickness of the fifth lens, T12 is a combined center thickness of the first lens and the second lens, T3456 is a combined center thickness of the third lens, the fourth lens, the fifth lens and the sixth lens.

[0024] Further, the day-night confocal wide-angle lens satisfies the following relationship:

[0025] 5.0 < R1 / R2 < 7.0;

[0026] 0.65 < |R3 / R4| < 1.5;

[0027] 1.2 < |R1+R2 / R1-R2| < 1.5;

[0028] 0.3 < |R3+R4 / R3-R4| < 0.7;

[0029] wherein R1 is a radius of curvature of a object side surface of the first lens, R2 is a radius of curvature of an image side surface of the first lens, R3 is a radius of curvature of a object side surface of the second lens, R4 is a radius of curvature of an image side surface of the second lens.

[0030] Further, the day-night confocal wide-angle lens has a day-night confocal, visible light band and infrared band center defocus amount less than or equal to 10 um.

[0031] The application also provides an electronic device, comprising a device body, and further comprising the day-night confocal wide-angle lens according to any one of the above embodiments, which is arranged on one side of the device body. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 Fig. 1 is a structural schematic diagram of a day-night confocal wide-angle lens according to a first embodiment of the application;

[0033] Figure 2 Fig. 2 is a polychromatic diffraction modulation transfer function curve of the day-night confocal wide-angle lens in Fig. 1 under visible light characteristics; Figure 1

[0034] Figure 3 Fig. 3 is a polychromatic diffraction modulation transfer function curve of the day-night confocal wide-angle lens in Fig. 1 under infrared light characteristics; Figure 1

[0035] Figure 4 ​​For Figure 1 The field curvature and distortion of the day and night confocal wide-angle lens in the visible light characteristics in the schematic view;

[0036] Figure 5 For Figure 1 The field curvature and distortion of the day and night confocal wide-angle lens in the infrared light characteristics in the schematic view;

[0037] Figure 6 For Figure 1 The polychromatic diffraction through-focus MTF curve of the day and night confocal wide-angle lens in the visible light characteristics in the schematic view;

[0038] Figure 7 For Figure 1 The polychromatic diffraction through-focus MTF curve of the day and night confocal wide-angle lens in the infrared light characteristics in the schematic view;

[0039] Figure 8 The structure schematic view of the day and night confocal wide-angle lens in the third embodiment of the application;

[0040] Figure 9 For Figure 8 The polychromatic diffraction MTF curve of the day and night confocal wide-angle lens in the visible light characteristics in the schematic view;

[0041] Figure 10 For Figure 8 The polychromatic diffraction MTF curve of the day and night confocal wide-angle lens in the infrared light characteristics in the schematic view;

[0042] Figure 11 For Figure 8 The field curvature and distortion of the day and night confocal wide-angle lens in the visible light characteristics in the schematic view;

[0043] Figure 12 For Figure 8 The field curvature and distortion of the day and night confocal wide-angle lens in the infrared light characteristics in the schematic view;

[0044] Figure 13 For Figure 8 The polychromatic diffraction through-focus MTF curve of the day and night confocal wide-angle lens in the visible light characteristics in the schematic view;

[0045] Figure 14 For Figure 8 The polychromatic diffraction through-focus MTF curve of the day and night confocal wide-angle lens in the infrared light characteristics in the schematic view;

[0046] Figure 15 The structure schematic view of the day and night confocal wide-angle lens in the third embodiment of the application;

[0047] Figure 16 For Figure 15The diffraction modulation transfer function curves of the day and night confocal wide-angle lens under visible light characteristics;

[0048] Figure 17 for Figure 15 The diffraction modulation transfer function curve of the day and night confocal wide-angle lens under infrared light characteristics;

[0049] Figure 18 for Figure 15 A schematic diagram of field curvature and distortion of a day / night confocal wide-angle lens under visible light characteristics;

[0050] Figure 19 for Figure 15 A schematic diagram of field curvature and distortion of a day / night confocal wide-angle lens under infrared light characteristics;

[0051] Figure 20 for Figure 15 The multicolor diffraction defocus modulation transfer function curve of the day and night confocal wide-angle lens under visible light characteristics;

[0052] Figure 21 for Figure 15 The multicolor diffraction defocus modulation transfer function curve of the day and night confocal wide-angle lens under infrared light characteristics;

[0053] Figure 22 This is a schematic diagram of the structure of the day and night confocal wide-angle lens in the fourth embodiment of the present invention;

[0054] Figure 23 for Figure 22 The diffraction modulation transfer function curves of the day and night confocal wide-angle lens under visible light characteristics;

[0055] Figure 24 for Figure 22 The diffraction modulation transfer function curve of the day and night confocal wide-angle lens under infrared light characteristics;

[0056] Figure 25 for Figure 22 A schematic diagram of field curvature and distortion of a day / night confocal wide-angle lens under visible light characteristics;

[0057] Figure 26 for Figure 22 A schematic diagram of field curvature and distortion of a day / night confocal wide-angle lens under infrared light characteristics;

[0058] Figure 27 for Figure 22 The multicolor diffraction defocus modulation transfer function curve of the day and night confocal wide-angle lens under visible light characteristics;

[0059] Figure 28 for Figure 22Figure 2 is a graph of the polychromatic on-axis modulation transfer function curves as a function of spatial frequency for various wavelengths for the day and night confocal wide-angle lens of Figure 1 ;

[0060] The following detailed description will further describe the present application with reference to the above mentioned drawings. DETAILED DESCRIPTION

[0061] For the purposes of this disclosure, reference will be made to the accompanying drawings which form a part of the disclosure. The drawings are not necessarily to scale of one another and are intended for purposes of illustration only and form no definition of the scope of the application. The drawings illustrate one embodiment of the application and there can be many variations to that embodiment. It is intended that all such variations fall within the scope of the application.

[0062] It should be noted that when an element or layer is referred to as being "on" another element or substrate, it can be directly on the other element or substrate or intervening layers can also be present. Where an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening layers can also be present. The term "vertical", "horizontal", "left", "right", and the like as used herein are used for illustration only and do not necessarily correspond to actual relative positions.

[0063] 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 application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0064] Embodiment One

[0065] Referring to Figures 1 to 7 The day and night confocal wide-angle lens according to the first embodiment of the present application comprises, in order from the object side to the image side along the optical axis, a first lens 11, a second lens 12, a diaphragm 18, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, and a filter 17. The object side surface of the first lens 11 in the optical axis region is convex, and the image side surface is concave. The object side surface of the second lens 12 in the optical axis region is concave, and the image side surface is convex. The object side surface of the third lens 13 in the optical axis region is convex, and the image side surface is convex. The object side surface of the fourth lens 14 in the optical axis region is concave, and the image side surface is concave. The object side surface of the fifth lens 15 in the optical axis region is convex, and the image side surface is convex. In this embodiment, the structure parameters of the day and night confocal wide-angle lens satisfy Table 1, and the aspheric surface parameters satisfy Table 2 and Table 3.

[0066] Table 1

[0067]

[0068] Table 2

[0069]

[0070] Table 3

[0071]

[0072]

[0073] The day and night confocal wide-angle lens described above, through the structure and parameter setting of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15 and the sixth lens 16, the field of view angle of the product can reach 165.45°, greatly improving the field of view angle of the product.

[0074] Example two

[0075] Please refer to Figures 8 to 14 The day and night confocal wide-angle lens provided by the second embodiment of the application comprises a first lens 21, a second lens 22, a diaphragm 28, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26 and a filter 27 arranged in sequence from the object side to the image side along the optical axis direction, the object side surface of the optical axis area of the first lens 21 is a convex surface, and the image side surface is a concave surface, the object side surface of the optical axis area of the second lens 22 is a concave surface, and the image side surface is a convex surface, the object side surface of the optical axis area of the third lens 23 is a convex surface, and the image side surface is a convex surface, the object side surface of the optical axis area of the fourth lens 24 is a concave surface, and the image side surface is a concave surface, the object side surface of the optical axis area of the fifth lens 25 is a convex surface, and the image side surface is a convex surface, and specifically, in the embodiment, the structure parameters of the day and night confocal wide-angle lens satisfy Table 4, and the aspheric surface parameters satisfy Table 5 and Table 6.

[0076] Table 4

[0077]

[0078]

[0079] Table 5

[0080]

[0081] Table 6

[0082]

[0083] The day and night confocal wide-angle lens has the field of view angle of the product reaching 165.41° by the structure and parameters of the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25 and the sixth lens 26, and greatly improves the field of view angle of the product.

[0084] Embodiment three

[0085] Please refer to Figures 15 to 21 The third embodiment of the present application provides a kind of day and night confocal wide-angle lens, including first lens 31, second lens 32, diaphragm 38, third lens 33, fourth lens 34, fifth lens 35, sixth lens 36 and filter 37 sequentially arranged from object side to image side and along the direction of optical axis, the object side surface of the optical axis area of the first lens 31 is convex, and the image side surface is concave, the object side surface of the optical axis area of the second lens 32 is concave, and the image side surface is convex, the object side surface of the optical axis area of the third lens 33 is convex, and the image side surface is convex;The object side surface of the optical axis area of the fourth lens 34 is concave, and the image side surface is concave;The object side surface of the optical axis area of the fifth lens 35 is convex, and the image side surface is convex;Specifically, in the present embodiment, the structure parameters of the day and night confocal wide-angle lens satisfy Table 7, asphericity parameter satisfies Table 8 and Table 9.

[0086] Table 7

[0087]

[0088] Figure 8

[0089]

[0090]

[0091] Figure 9

[0092]

[0093] The day and night confocal wide-angle lens has the field of view angle of the product reaching 165.41° by the structure and parameters of the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25 and the sixth lens 26, and greatly improves the field of view angle of the product.

[0094] Embodiment four

[0095] Please refer to Figures 22 to 28The first embodiment of the present application provides a day and night confocal wide-angle lens, which comprises, in order from the object side to the image side and along the optical axis direction, a first lens 41, a second lens 42, a diaphragm 48, a third lens 43, a fourth lens 44, a fifth lens 45, a sixth lens 46 and a filter 47, the object side surface of the optical axis region of the first lens 41 is a convex surface, and the image side surface is a concave surface, the object side surface of the optical axis region of the second lens 42 is a concave surface, and the image side surface is a convex surface, the object side surface of the optical axis region of the third lens 43 is a convex surface, and the image side surface is a convex surface, the object side surface of the optical axis region of the fourth lens 44 is a concave surface, and the image side surface is a concave surface, and the object side surface of the optical axis region of the fifth lens 45 is a convex surface, and the image side surface is a convex surface, specifically, in the embodiment, the structure parameters of the day and night confocal wide-angle lens satisfy Table 10, and the aspheric surface parameters satisfy Table 11 and Table 12.

[0096] Table 10

[0097]

[0098]

[0099] Table 11

[0100]

[0101] Table 12

[0102]

[0103]

[0104] The day and night confocal wide-angle lens can achieve a field of view angle of 180° through the structure and parameters of the first lens 41, the second lens 42, the third lens 43, the fourth lens 44, the fifth lens 45 and the sixth lens 46, and greatly improves the field of view angle of the product.

[0105] In some embodiments of the present application, the two-piece micro lens also satisfies the following relationship:

[0106] f1'<0, f2'>0, f3'>0, f4'<0, f5'>0, f6'<0;

[0107] 0.15<IH / TTL<0.3;

[0108] -1.3<f1' / f3'<-1.2, -1.6<f1' / f5'<-1.8, 0<f' / f12'<0.1, 0.2<f' / f3456'<0.6, 20<f12' / f3456'<140;

[0109] Wherein, f' is the focal length of the day and night confocal wide-angle lens, TTL is the distance between the object side of the first lens and the image plane, IH is the half image height of the day and night confocal wide-angle lens, the focal lengths of the first lens to the sixth lens are f1', f2', f3', f4', f5', f6' respectively, f12' is the combined focal length of the first lens and the second lens, and f3456' is the combined focal length of the third lens, the fourth lens, the fifth lens and the sixth lens.

[0110] The day and night confocal wide-angle lens has a field of view angle of 160 to 180 through the structure and parameter setting of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, and greatly improves the field of view angle of the product.

[0111] In an embodiment of the present application, the first lens has a refractive index greater than 1.50 and an Abbe number greater than 40.

[0112] In an embodiment of the present application, the second lens, the fourth lens and the sixth lens each have a refractive index greater than 1.60 and an Abbe number greater than 25.

[0113] In an embodiment of the present application, the fifth lens has a refractive index greater than 1.50 and an Abbe number greater than 40.

[0114] In an embodiment of the present application, the day and night confocal wide-angle lens has an aperture number greater than or equal to 1.8.

[0115] In an embodiment of the present application, the day and night confocal wide-angle lens also satisfies the following relationship:

[0116] 1.2 < SAG11 / SAG22 < 2.5, 1.5 < SAG52 / SAG62 < 2.6;

[0117] Wherein, SAG11 is the axial distance between the intersection of the object side of the first lens and the optical axis and the effective radius vertex of the object side of the first lens, SAG22 is the axial distance between the intersection of the image side of the second lens and the optical axis and the effective radius vertex of the image side of the second lens, SAG52 is the axial distance between the intersection of the image side of the fifth lens and the optical axis and the effective radius vertex of the image side of the fifth lens, and SAG62 is the axial distance between the intersection of the image side of the sixth lens and the optical axis and the effective radius vertex of the image side of the sixth lens.

[0118] In an embodiment of the present application, the second lens to the sixth lens are all even-order aspheric plastic lenses, which satisfy the following relationship:

[0119] 0.05 ≤ AT4 / T5 ≤ 0.1.

[0120] 1.4 < T12 / T3456 < 1.8;

[0121] 0.5 < T12 / TTL < 0.6;

[0122] 0.7 ≤ T1 / T5 ≤ 1.5;

[0123] wherein AT4 is an air gap of the fourth lens and the fifth lens, T1 is a center thickness of the first lens, T5 is a center thickness of the fifth lens, T12 is a combined center thickness of the first lens and the second lens, and T3456 is a combined center thickness of the third lens, the fourth lens, the fifth lens and the sixth lens.

[0124] In an embodiment of the present application, the day-night confocal wide-angle lens further satisfies the following relationship:

[0125] 5.0 < R1 / R2 < 7.0;

[0126] 0.65 < |R3 / R4| < 1.5;

[0127] 1.2 < |R1+R2 / R1-R2| < 1.5;

[0128] 0.3 < |R3+R4 / R3-R4| < 0.7;

[0129] wherein R1 is a radius of curvature of a lens object side of the first lens, R2 is a radius of curvature of a lens image side of the first lens, R3 is a radius of curvature of a lens object side of the second lens, and R4 is a radius of curvature of a lens image side of the second lens.

[0130] In an embodiment of the present application, the day-night confocal wide-angle lens has a day-night confocal, visible waveband and infrared waveband center defocus amount less than or equal to 10 um.

[0131] In an embodiment of the present application, an electronic device is also provided, comprising a device body, and further comprising the day-night confocal wide-angle lens according to any one of the above embodiments, which is arranged on one side of the device body.

[0132] The electronic device has the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens arranged in the sub-device body, and the structure and parameters of the lenses are set, so that the field of view angle of the electronic device can reach 160 to 180, greatly improving the field of view angle of the product.

[0133] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A day-and-night confocal wide-angle lens, characterized in that, The lens comprises a first lens, a second lens, an aperture stop, a third lens, a fourth lens, a fifth lens, a sixth lens, and a filter, arranged sequentially from the object side to the image side along the optical axis. The object side of the first lens in the optical axis region is convex, and the image side is concave. The object side of the second lens in the optical axis region is concave, and the image side is convex. The object side and image side of the third lens in the optical axis region are both convex. The object side and image side of the fourth lens in the optical axis region are both concave. The object side and image side of the fifth lens in the optical axis region are both convex. The day / night confocal wide-angle lens satisfies the following relationship: f1'<0, f2'>0, f3'>0, f4'<0, f5'>0, f6'<0; 0.15 <IH / TTL<0.3; -1.3 <f1' / f3'<-1.2,-1.6<f1' / f5'<-1.8,0<f' / f12'<0.1,0.2<f' / f3456'<0.6,20<f12' / f3456'<140; Wherein, f' is the focal length of the day-night confocal 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 day-night confocal wide-angle lens, the focal lengths of the first lens to the sixth lens are f1', f2', f3', f4', f5', and f6' respectively, f12' is the combined focal length of the first lens and the second lens, and f3456' is the combined focal length of the third lens, the fourth lens, the fifth lens, and the sixth lens. The first lens has a refractive index greater than 1.50 and an Abbe number greater than 40, and the second lens, the fourth lens, and the sixth lens all have a refractive index greater than 1.60 and an Abbe number greater than 25.

2. The day-night confocal wide-angle lens according to claim 1, characterized in that, The fifth lens has a refractive index greater than 1.50 and an Abbe number greater than 40.

3. The day-night confocal wide-angle lens according to claim 1, characterized in that, The aperture number of the day and night confocal wide-angle lens is greater than or equal to 1.

8.

4. The day-night confocal wide-angle lens according to claim 1, characterized in that, The day and night confocal wide-angle lens also satisfies the following relationship: 1.2 <SAG11 / SAG22<2.5,1.5<SAG52 / SAG62<2.6; Wherein, SAG11 is the axial distance between the intersection of the object side and the optical axis of the first lens and the vertex of the effective radius of the object side of the first lens; SAG22 is the axial distance between the intersection of the image side and the optical axis of the second lens and the vertex of the effective radius of the image side of the second lens; SAG52 is the axial distance between the intersection of the image side and the optical axis of the fifth lens and the vertex of the effective radius of the image side of the fifth lens; and SAG62 is the axial distance between the intersection of the image side and the optical axis of the sixth lens and the vertex of the effective radius of the image side of the sixth lens.

5. The day-night confocal wide-angle lens according to claim 1, characterized in that, The second to the sixth lenses are all even-order aspherical plastic lenses, which satisfy the following relationship: 0.05≤AT4 / T5≤0.1; 1.4 <T12 / T3456<1.8; 0.5 <T12 / TTL<0.6; 0.7≤T1 / T5≤1.5; Wherein, AT4 is the air gap between the fourth and fifth lenses, T1 is the center thickness of the first lens, T5 is the center thickness of the fifth lens, T12 is the combined center thickness of the first and second lenses, and T3456 is the combined center thickness of the third, fourth, fifth, and sixth lenses.

6. The day-night confocal wide-angle lens according to claim 1, characterized in that, The day and night confocal wide-angle lens also satisfies the following relationship: 5.0 <R1 / R2<7.0; 0.65 < |R3 / R4| < 1.5; 1.2 < |R1+R2 / R1-R2| < 1.5; 0.3 < |R3+R4 / R3-R4| < 0.7; 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, and R4 is the radius of curvature of the image side of the second lens.

7. The day-night confocal wide-angle lens according to claim 1, characterized in that, The day and night confocal wide-angle lens has a center defocus amount of less than or equal to 10µm in both the day and night confocal, visible light band, and infrared band.

8. An electronic device, comprising a device body, characterized in that, It also includes a day-night confocal wide-angle lens as described in any one of claims 1-7, the day-night confocal wide-angle lens being disposed on one side of the device body.

Images