Ultra-wide lens and electronic device

Abstract

This application provides an ultra-wide-angle lens and an electronic device. The ultra-wide-angle lens includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially from the object side to the image side along the optical path; the first lens is a positive refractive power lens; the second lens is a negative refractive power lens; the third lens is a positive refractive power lens; and the fourth lens is a negative refractive power lens. The four lenses, through adjustments to their respective structural parameters and / or optical parameters, enable the lens to satisfy the following conditional relationships: TTL ≤ 2.9 mm; FOV ≥ 108°; where TTL is the total optical length; and FOV is the field of view.

Description

Technical Field

[0001] This application relates to the field of imaging technology, and more particularly to an ultra-wide-angle lens and electronic device. Background Technology

[0002] In recent years, with the continuous development of electronic devices, users' demands for camera lenses have become increasingly diversified and sophisticated. Ultra-wide-angle lenses can capture more scene information within a limited distance, making them particularly suitable for shooting wide-ranging landscapes, architecture, or group photos. Their unique imaging characteristics not only enhance the user's visual experience but also provide more creative possibilities for various application scenarios, attracting widespread attention and application.

[0003] However, in order to correct aberrations and ensure high-quality imaging, ultra-wide-angle lenses require multiple lenses to reduce common optical problems such as spherical aberration, coma, and chromatic aberration in order to achieve the required optical performance. But this also leads to a significant increase in size, resulting in a larger overall lens size that is difficult to adapt to space-constrained applications, such as laptop webcams, and is not conducive to the thinner and lighter design of electronic devices. Utility Model Content

[0004] The purpose of this application is to provide an ultra-wide-angle lens and an electronic device.

[0005] To address the aforementioned technical problems, this application provides the following technical solutions:

[0006] The first aspect of this application provides an ultra-wide-angle lens, comprising:

[0007] A first lens, a second lens, a third lens, and a fourth lens are arranged sequentially from the object side to the image side along the optical path;

[0008] The first lens is a positive refractive power lens; the second lens is a negative refractive power lens; the third lens is a positive refractive power lens; and the fourth lens is a negative refractive power lens.

[0009] The four lenses, through adjustments to their respective structural and / or optical parameters, ensure that the lens satisfies the following conditional relationship:

[0010] TTL≤2.9mm;

[0011] FOV ≥ 108°;

[0012] Where TTL is the total optical length; FOV is the field of view.

[0013] In some modified embodiments of the first aspect of this application

[0014] The object-side surface of the first lens is convex, and the image-side surface of the first lens is concave.

[0015] Both the object-side and image-side surfaces of the second lens are concave.

[0016] The object-side surface of the third lens is concave, and the image-side surface of the third lens is convex.

[0017] The object-side and image-side surfaces of the fourth lens are both concave.

[0018] In some embodiments, the following conditional relationship is satisfied:

[0019] 2.4 ≤ f1 / f ≤ 2.6;

[0020] -293≤f2 / f≤-88;

[0021] 0.6≤f³ / f≤0.8;

[0022] -1.2≤f4 / f≤-0.7;

[0023] Where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f is the total focal length of the lens.

[0024] In some embodiments, the following conditional relationship is satisfied:

[0025] 0.08≤T1 / TTL≤0.10;

[0026] 0.05≤T2 / TTL≤0.08;

[0027] 0.30≤T3 / TTL≤0.35;

[0028] 0.08≤T4 / TTL≤0.12;

[0029] Wherein, T1 is the on-axis thickness of the first lens, T2 is the on-axis thickness of the second lens, T3 is the on-axis thickness of the third lens, and T4 is the on-axis thickness of the fourth lens.

[0030] In some embodiments, the following conditional relationship is satisfied:

[0031] 1.50≤n1≤1.55;

[0032] 1.60≤n²≤1.65;

[0033] 1.50≤n3≤1.55;

[0034] 1.65≤n4≤1.70;

[0035] Wherein, n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, and n4 is the refractive index of the fourth lens.

[0036] In some embodiments, the following conditional relationship is satisfied:

[0037] -2.3≤(R1+R2) / (R1-R2)≤-1.5;

[0038] 34.0≤(R3+R4) / (R3-R4)≤67.0;

[0039] 1.3≤(R5+R6) / (R5-R6)≤1.4;

[0040] 2.2≤(R7+R8) / (R7-R8)≤2.7;

[0041] 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.

[0042] In some embodiments, the following conditional relationship is satisfied:

[0043] 45≤v1≤60;

[0044] 17≤v2≤30;

[0045] 45≤v3≤60;

[0046] 17≤v4≤30;

[0047] Wherein, v1 is the dispersion coefficient of the first lens, v2 is the dispersion coefficient of the second lens, v3 is the dispersion coefficient of the third lens, and v4 is the dispersion coefficient of the fourth lens.

[0048] In some embodiments, the following conditional relationship is satisfied:

[0049] Φ≤3.70mm; and / or,

[0050] Fno≤2.21; and / or,

[0051] IH ≥ 4.61;

[0052] Where Φ is the maximum effective diameter of each lens; Fno is the aperture number of the lens; and IH is the imaging height of the lens.

[0053] In some embodiments, all four lenses are aspherical lenses; and / or, all four lenses are made of plastic.

[0054] A second aspect of this application provides an electronic device, comprising:

[0055] Ultra-wide-angle lenses, including:

[0056] A first lens, a second lens, a third lens, and a fourth lens are arranged sequentially from the object side to the image side along the optical path;

[0057] The first lens is a positive refractive power lens; the second lens is a negative refractive power lens; the third lens is a positive refractive power lens; and the fourth lens is a negative refractive power lens.

[0058] The four lenses, through adjustments to their respective structural and / or optical parameters, ensure that the lens satisfies the following conditional relationship:

[0059] TTL≤2.9mm;

[0060] FOV ≥ 108°;

[0061] Where TTL is the total optical length; FOV is the field of view. Attached Figure Description

[0062] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0063] Figure 1 This is the optical path diagram of the ultra-wide-angle lens in Embodiment 1 of this application;

[0064] Figure 2 This is the axial chromatic difference curve of Embodiment 1 of the present invention under visible light;

[0065] Figure 3 This is a magnification color difference curve of Embodiment 1 of the present invention under visible light;

[0066] Figure 4 This is a schematic diagram of field curvature and distortion under visible light in Embodiment 1 of the present invention;

[0067] Figure 5 This is the optical path diagram of the ultra-wide-angle lens in Embodiment 2 of this application;

[0068] Figure 6 This is the axial chromatic difference curve of Embodiment 2 of the present invention under visible light;

[0069] Figure 7This is a magnification color difference curve of Embodiment 2 of the present invention under visible light;

[0070] Figure 8 This is a schematic diagram of field curvature and distortion under visible light according to an embodiment of the present invention;

[0071] Figure 9 This is the optical path diagram of the ultra-wide-angle lens in Embodiment 3 of this application;

[0072] Figure 10 This is the axial color difference curve of Embodiment 3 of the present invention under visible light;

[0073] Figure 11 This is a magnification color difference curve of Embodiment 3 of the present invention under visible light;

[0074] Figure 12 This is a schematic diagram of field curvature and distortion under visible light in Embodiment 3 of the present invention;

[0075] Explanation of icon numbers:

[0076] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Filter; 6. Image sensor. Detailed Implementation

[0077] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0078] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0079] like Figure 1 , Figure 5 and Figure 9 As shown, the first aspect of this application provides an ultra-wide-angle lens, comprising:

[0080] A first lens 1, a second lens 2, a third lens 3, and a fourth lens 4 are arranged sequentially from the object side to the image side along the optical path;

[0081] The first lens 1 is a positive refractive power lens; the second lens 2 is a negative refractive power lens; the third lens 3 is a positive refractive power lens; and the fourth lens 4 is a negative refractive power lens.

[0082] The four lenses, through adjustments to their respective structural and / or optical parameters, ensure that the lens satisfies the following conditional relationship:

[0083] TTL≤2.9mm;

[0084] FOV ≥ 108°;

[0085] Where TTL is the total optical length; FOV is the field of view.

[0086] Specifically, the first lens 1 is responsible for converging light rays, improving light intake efficiency, and balancing chromatic aberration to reduce the impact of chromatic aberration on image quality. The first lens 1 can be a biconvex lens, which has two outwardly curved surfaces that can more effectively converge incident light rays towards the center, capturing as much light as possible within a limited space and increasing the amount of light entering the lens.

[0087] The second lens 2, with its negative refractive power, works in conjunction with the first lens 1, which has a positive refractive power, to effectively correct spherical aberration and coma, maintaining good image quality. The second lens 2 can be a concave-convex lens (i.e., a meniscus lens with a concave object side and a convex image side) to better balance spherical aberration and coma, ensuring image quality. Furthermore, the negative refractive power lens, by adjusting the divergence of light, can guide more peripheral light rays into the lens, thereby expanding the shooting angle.

[0088] The third lens 3 is used to assist focusing and further correct coma and astigmatism. The third lens 3 can be a biconvex lens to improve the light-gathering ability and assist in completing the focusing process.

[0089] The fourth lens 4 works in conjunction with the first to third lenses 3 to correct chromatic aberration and distortion, ensuring image quality. The fourth lens 4 can be a concave-planar lens (i.e., the object-side surface of the fourth lens 4 is concave, and the image-side surface of the fourth lens 4 is flat). The negative refractive power lens, by adjusting the divergence of light, can guide more peripheral light rays into the lens, thereby expanding the shooting angle.

[0090] The four lenses can be partially or entirely made of spherical lenses to reduce production costs. Depending on the final imaging requirements, some or all of the lens surfaces can be coated to improve light transmittance and reduce reflection.

[0091] The total optical length and field of view can be controlled by adjusting the structural parameters of the four lenses. These structural parameters can include at least one of the following: the radius of curvature of each lens, the center thickness of each lens, and the air gap between adjacent lenses. The radius of curvature of the convex surface directly affects light convergence. A larger radius of curvature indicates a more "gentle" surface, allowing edge rays to enter more easily, thus expanding the field of view. A smaller radius of curvature indicates a more "steep" surface, increasing refractive power and allowing light to converge more quickly, thus shortening the total optical length. Similarly, a larger absolute value of the radius of curvature of the concave surface indicates a more "gentle" surface, preventing excessive stretching of the light path and compressing the total optical length. A smaller absolute value indicates a deeper surface, guiding more edge rays and contributing to an expanded field of view. A smaller center thickness means less space the lens occupies along the optical axis, further reducing the total optical length. Smaller air gaps between adjacent lenses result in a shorter overall system length and a smaller total optical length, improving system compactness. or,

[0092] The overall optical length and field of view can be controlled by adjusting the optical parameters of each of the four lenses. Optical parameters can include at least one of refractive index, dispersion coefficient, and focal length. The refractive index directly affects the lens's refractive power. A higher refractive index results in stronger refractive power, allowing for more efficient light focusing, which helps compress the overall optical length, reduce the number or size of lenses, and expand the field of view, allowing light to enter the lens at a wider angle. A higher dispersion coefficient results in lower dispersion, which helps suppress axial chromatic aberration. In ultra-wide-angle lenses, lenses with high dispersion coefficients help suppress axial chromatic aberration, ensuring color consistency across a wide field of view. A shorter system focal length results in a larger field of view, which is beneficial for achieving ultra-wide-angle imaging. Alternatively,

[0093] The total optical length and field of view can be controlled by adjusting the structural and optical parameters of each of the four lenses. By appropriately configuring these structural and / or optical parameters, an ultra-wide-angle lens design with a TTL ≤ 2.9mm and an FOV ≥ 108° can be achieved. The TTL can be 2.9mm, 2.8mm, or 2.7mm, etc., and the FOV can be 108°, 108.2°, 109°, or 110°, etc.

[0094] The lenses can be made of the same material; or, some lenses can be made of the same material and some different materials; or, all lenses can be made of different materials. Lens materials include glass and resin, among others. Glass lenses have a higher dispersion coefficient and a higher refractive index than resin lenses. Resin lenses are less expensive and facilitate lightweight design. Lens material combinations can be flexibly selected based on actual application requirements to achieve the optimal balance between high performance and low cost.

[0095] The ultra-wide-angle lens may also include a filter 5, an image sensor 6, and an aperture. The filter 5 and the image sensor 6 are sequentially arranged on the image side of the fourth lens 4. The filter 5 is used to filter out infrared light or adjust the spectral transmittance to improve the accuracy of color reproduction and image sharpness. The filter 5 can be an infrared cut-off filter 5, a bandpass filter 5, or a blue light enhancement filter 5, etc., which can be selected according to the specific application scenario. The image sensor 6 is used to receive the light signal modulated by the lens system and the filter 5, and convert it into an electrical signal for subsequent processing. The image sensor 6 can be of CMOS or CCD type to adapt to the design requirements of different resolutions and pixel sizes. The aperture can be set on the object side of the first lens 1 to control the amount of light entering the lens.

[0096] The ultra-wide-angle lens provided in the first aspect of this application improves the light intake efficiency and light utilization rate of the system by converging light through a first lens 1 and a third lens 3 and guiding it to subsequent lens assemblies. By adjusting the divergence of light through a second lens 2 and a fourth lens 4, more edge light rays can be guided into the lens, thereby expanding the field of view. The use of a lens configuration with alternating positive and negative refractive forces effectively expands the field of view while effectively suppressing various aberrations such as spherical aberration, coma, and distortion, significantly reducing various aberrations and ensuring high-quality images throughout the entire field of view. The four-element design reduces the number of lenses, simplifying system complexity and effectively reducing the number of optical components, thus lowering overall weight and manufacturing costs. By precisely controlling the optical and / or structural parameters of each lens, a TTL of ≤2.9mm is achieved while maintaining a field of view (FOV) ≥ 108°, enabling the ultra-wide-angle lens to be miniaturized and suitable for highly integrated portable electronic devices.

[0097] In some embodiments, the object-side surface of the first lens 1 is convex, and the image-side surface of the first lens 1 is concave.

[0098] Both the object-side surface and the image-side surface of the second lens 2 are concave.

[0099] The object-side surface of the third lens 3 is concave, and the image-side surface of the third lens 3 is convex.

[0100] The object-side surface and the image-side surface of the fourth lens 4 are both concave.

[0101] Specifically, the object side of the first lens 1 is convex, which can receive incident light at a larger angle, thus ensuring light intake efficiency and expanding the field of view. The image side of the first lens 1 is concave, which can alleviate the divergence of light in front of the second lens 2, thereby expanding the field of view while also controlling aberrations.

[0102] The second lens 2 is a biconcave negative lens, which has strong divergence capabilities and can guide edge rays outward, thereby further expanding the field of view. In addition, the second lens 2 can also provide reverse compensation for the spherical aberration and coma produced by the first lens 1, and its "stretching" effect helps to balance the excessive converging effect of the first lens 1.

[0103] The third lens 3 is a concave-convex lens. The object side of the concave surface of the third lens 3 faces forward, which helps to gently guide the light propagation path; the image side of the convex surface of the third lens 3 can enhance the converging effect and improve the overall image quality.

[0104] The fourth lens 4 is a biconcave lens used for final aberration correction and light incident angle optimization, ensuring that edge light rays hit the image sensor 6 at a near-vertical angle, thereby guaranteeing high-quality imaging.

[0105] In some embodiments, the following conditional relationship is satisfied:

[0106] 2.4 ≤ f1 / f ≤ 2.6;

[0107] -293≤f2 / f≤-88;

[0108] 0.6≤f³ / f≤0.8;

[0109] -1.2≤f4 / f≤-0.7;

[0110] Where f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 3, f4 is the focal length of the fourth lens 4, and f is the total focal length of the lens.

[0111] Specifically, adjusting the focal length of a lens includes at least one of the following: changing the radius of curvature of the object-side or image-side of the lens, changing the lens material, or adjusting the center thickness of the lens. The total focal length can be adjusted by adjusting the focal lengths of each lens and the air gap between adjacent lenses. Specifically, f1 / f can be 2.4, 2.5, or 2.6, etc.; f2 / f can be -293, -200, -120, or -88, etc.; f3 / f can be 0.6, 0.7, or 0.8, etc.; and f4 / f can be -1.2, -1.0, or -0.7, etc.

[0112] By ensuring that the focal lengths of each lens meet a preset ratio with the total focal length, more precise optical coordination among the four lenses can be achieved. At this focal length ratio, the first lens 1 and the third lens 3 enhance light-gathering ability and improve light-gathering efficiency, while also laying a solid foundation for subsequent aberration correction. The second lens 2 and the fourth lens 4, based on this focal length ratio requirement, can fully utilize their negative refractive power to effectively correct various aberrations such as spherical aberration, coma, chromatic aberration, and distortion, ensuring high-quality images across the entire field of view. For example, when shooting at large angles of view, distortion and color deviation at the edges of the image are significantly improved, and image sharpness and color reproduction are greatly enhanced. By strictly controlling the ratio of each lens's focal length to the total focal length, combined with optimization of structural and optical parameters, an extremely short total optical length (TTL≤2.9mm) is achieved while ensuring image quality.

[0113] In some embodiments, the following conditional relationship is satisfied:

[0114] 0.08≤T1 / TTL≤0.10;

[0115] 0.05≤T2 / TTL≤0.08;

[0116] 0.30≤T3 / TTL≤0.35;

[0117] 0.08≤T4 / TTL≤0.12;

[0118] Wherein, T1 is the on-axis thickness of the first lens 1, T2 is the on-axis thickness of the second lens 2, T3 is the on-axis thickness of the third lens 3, and T4 is the on-axis thickness of the fourth lens 4.

[0119] Specifically, to ensure the accuracy of the thickness on each lens axis, when the lens is made of glass, precision grinding and polishing processes can be used; when the lens is made of resin, injection molding can be used. Specifically, T1 / TTL can be 0.08, 0.09, or 0.10; T2 / TTL can be 0.05, 0.06, 0.07, or 0.08, etc.; T3 / TTL can be 0.30, 0.32, or 0.35, etc.; and T4 / TTL can be 0.08, 0.10, or 0.12, etc.

[0120] By adhering to the ratio of the thickness on each lens axis to the total optical length, and rationally allocating the thickness of each lens, the overall thickness of the lens can be effectively controlled, ensuring that the total optical length TTL is ≤2.9mm. This allows the lens to be better adapted to space-constrained portable electronic devices, promoting the development of electronic devices towards thinner and lighter designs.

[0121] In some embodiments, the following conditional relationship is satisfied:

[0122] 1.50≤n1≤1.55;

[0123] 1.60≤n²≤1.65;

[0124] 1.50≤n3≤1.55;

[0125] 1.65≤n4≤1.70;

[0126] Wherein, n1 is the refractive index of the first lens 1, n2 is the refractive index of the second lens 2, n3 is the refractive index of the third lens 3, and n4 is the refractive index of the fourth lens 4.

[0127] Specifically, the refractive index of a lens can be adjusted by changing the type of material, such as using optical glass or resin; alternatively, nano-sized titanium dioxide or zirconium oxide particles can be added to the base resin to increase its refractive index. Specifically, n1 can be 1.50, 1.53, or 1.55, etc.; n2 can be 1.60, 1.63, or 1.65, etc.; n3 can be 1.50, 1.53, or 1.55, etc.; and n4 can be 1.65, 1.67, or 1.70, etc.

[0128] By ensuring that each lens meets the preset refractive index condition, the optical matching degree between the lenses is significantly improved, which is beneficial for achieving an ultra-wide-angle optical system. The first lens 1 and the third lens 3 maintain good coordination during light convergence, reducing light refraction loss and improving light intake efficiency. The second lens 2 and the fourth lens 4 effectively correct various aberrations such as spherical aberration, coma, chromatic aberration, and distortion. When shooting with a field of view (FOV) ≥ 108°, the sharpness and color consistency at the image edges are greatly improved, ensuring image quality. By rationally selecting materials within the refractive index range and optimizing them in conjunction with other parameters, the total optical length is effectively controlled while ensuring optical performance. The total optical length (TTL) is ensured to be ≤ 2.9 mm.

[0129] In some embodiments, the following conditional relationship is satisfied:

[0130] -2.3≤(R1+R2) / (R1-R2)≤-1.5;

[0131] 34.0≤(R3+R4) / (R3-R4)≤67.0;

[0132] 1.3≤(R5+R6) / (R5-R6)≤1.4;

[0133] 2.2≤(R7+R8) / (R7-R8)≤2.7;

[0134] Wherein, R1 is the radius of curvature of the object-side surface of the first lens 1, R2 is the radius of curvature of the image-side surface of the first lens 1; R3 is the radius of curvature of the object-side surface of the second lens 2, R4 is the radius of curvature of the image-side surface of the second lens 2; R5 is the radius of curvature of the object-side surface of the third lens 3, R6 is the radius of curvature of the image-side surface of the third lens 3; R7 is the radius of curvature of the object-side surface of the fourth lens 4, and R8 is the radius of curvature of the image-side surface of the fourth lens 4.

[0135] Specifically, to ensure the radius of curvature meets design requirements, for optical glass lenses, a CNC edging machine can be used. Through a preset program, the movement trajectory of the grinding disc is precisely controlled, gradually bringing the lens surface curvature closer to the design value. For resin lenses, high-precision molds can be used during injection molding to ensure the accuracy of the radius of curvature. Specifically, (R1+R2) / (R1-R2) can be -2.3, -2.0, or -1.5, etc.; (R3+R4) / (R3-R4) can be 34.0, 50.0, or 67.0, etc.; (R5+R6) / (R5-R6) can be 1.3, 1.35, or 1.4, etc.; and (R7+R8) / (R7-R8) can be 2.2, 2.4, or 2.7, etc.

[0136] By ensuring that each lens meets a preset radius of curvature ratio, the light propagation path can be effectively optimized, improving the rationality of the system's refractive power distribution. This, in turn, corrects coma, distortion, and spherical aberration in the optical system while maintaining the field of view expansion capability, significantly improving aberration control performance. Furthermore, the preset radius of curvature ratio helps to compress the overall optical length, enabling the lens to achieve a thinner and lighter design while maintaining high performance, meeting the growing miniaturization demands of portable electronic devices for camera modules.

[0137] In some embodiments, the following conditional relationship is satisfied:

[0138] 45≤v1≤60;

[0139] 17≤v2≤30;

[0140] 45≤v3≤60;

[0141] 17≤v4≤30;

[0142] Wherein, v1 is the dispersion coefficient of the first lens 1, v2 is the dispersion coefficient of the second lens 2, v3 is the dispersion coefficient of the third lens 3, and v4 is the dispersion coefficient of the fourth lens 4.

[0143] Specifically, the dispersion coefficient is determined by the lens material itself. Lenses with different dispersion coefficients can be made from materials that produce the desired dispersion coefficients. For example, v1 can be 45, 52, or 60, etc.; v2 can be 17, 24, or 30, etc.; v3 can be 45, 52, or 60, etc.; and v4 can be 17, 23, or 30, etc.

[0144] By ensuring that each lens meets the preset dispersion coefficient conditions, the lens achieves excellent chromatic aberration correction. The low-dispersion materials of the first lens 1 and the third lens 3 effectively complement the high-dispersion materials of the second lens 2 and the fourth lens 4, focusing red, green, and blue light rays onto the same focal plane as much as possible, thus improving the accuracy of color reproduction and the clarity of image details. By reasonably controlling the dispersion characteristics of each lens, chromatic aberration in the edge field of view is also effectively suppressed. Under shooting conditions with a field of view ≥108°, artifacts such as red fringing, blue fringing, and purple fringing at the edge of the image are significantly improved, ensuring image quality.

[0145] In some embodiments, the following conditional relationship is satisfied:

[0146] Φ≤3.70mm; and / or,

[0147] Fno≤2.21; and / or,

[0148] IH ≥ 4.61;

[0149] Where Φ is the maximum effective diameter of each lens; Fno is the aperture number of the lens; and IH is the imaging height of the lens.

[0150] Specifically, Φ affects the overall size of the lens and the amount of light passing through. A larger Φ value allows the lens to receive a wider range of light, increasing the amount of light entering the lens and helping to improve image quality in low-light environments. A smaller Φ value facilitates the miniaturization of the lens structure, making it easier to integrate into space-constrained devices, such as ultra-thin mobile phones and small drone cameras. Φ can be 3.70mm, 3.50mm, or 3.30mm, etc.

[0151] Fno affects a lens's light-gathering ability and depth-of-field performance. A smaller Fno value means a larger aperture, allowing more light in, resulting in brighter, clearer images in low-light conditions. It also creates a shallower depth of field, which helps achieve an artistic effect of a prominent subject and a blurred background. Conversely, a larger Fno value means a smaller aperture, reducing the amount of light entering the lens. This is suitable for shooting in bright light and provides a deeper depth of field, improving the overall sharpness of the image. Fno values ​​can be 2.21, 2.19, or 2.17, etc.

[0152] IH (Input Height) affects the size of the image sensor 6 and the field of view that a lens can cover. A higher IH value allows the lens to support larger image sensor 6 sizes, accommodating larger, high-pixel sensors and thus capturing a wider range of image information, meeting the needs of wide-angle shooting, such as panoramic photography and security monitoring. Conversely, a lower IH value limits the lens's coverage area, making it suitable for applications with smaller image sensors 6. IH values ​​can be 4.61, 4.63, or 4.65, etc.

[0153] By comprehensively adjusting Φ, Fno, and IH, a lens system that combines miniaturization, large aperture, and wide field of view can be achieved while ensuring high performance. This system is widely applicable to portable optical imaging devices such as smartphones, action cameras, and drones.

[0154] In some embodiments, all four lenses are aspherical lenses; and / or, all four lenses are made of plastic.

[0155] Specifically, aspherical lenses effectively correct various aberrations, including spherical aberration, coma, and distortion, enabling the lens to deliver sharper, clearer image quality across the entire field of view. Aspherical lenses can more precisely control how light passes through the lens, significantly improving the quality of the final image, especially noticeable in large-aperture or wide-angle lenses. The design of aspherical lenses can reduce the number of lens elements required while maintaining or even improving optical performance. This helps to reduce lens size and lower production costs.

[0156] When using aspherical lenses, the conic coefficient k and higher-order aspherical coefficient A can be selected based on actual needs. A larger k value makes the surface more like an oblate spheroid or hyperboloid, suitable for designs requiring significant negative refractive power. A smaller k value makes the surface closer to a sphere or ellipsoid, suitable for scenarios requiring aberration correction without extreme curvature changes. A larger A value provides stronger higher-order corrections to the surface shape, suitable for correcting larger aberrations, such as at the edges of the field of view. A smaller A value results in a surface shape closer to an idealized lower-order model, suitable for applications with smaller aberrations or where a smooth transition is required.

[0157] Plastic materials have a low density, making them suitable for lightweight designs. Plastics can be mass-produced quickly through processes such as injection molding, and are easily manufactured into complex aspherical shapes. This translates to higher efficiency and lower costs in the production process. Various additives can be added to plastic lenses to modify their optical properties or other characteristics (such as increasing hardness or improving weather resistance) to meet specific application requirements.

[0158] Based on actual design requirements, the focal length of each lens can be proportional to the total focal length according to preset conditions; and / or, the on-axis thickness of each lens can be proportional to the total optical length according to preset conditions; and / or, the refractive index of each lens can be within a preset range; and / or, the radius of curvature of each lens can be proportional to a preset condition; and / or, the dispersion coefficient of each lens can be within a preset range; and / or, Φ can be within a preset range; and / or, Fno can be within a preset range; and / or, IH can be within a preset range. By coordinating the material and / or lens selection of each lens, lightweight, miniaturized, and highly integrated lens systems can be achieved while ensuring optical performance. Through synergistic optimization of the above parameters, various aberrations (such as spherical aberration, coma, chromatic aberration, distortion, etc.) can be effectively corrected, improving the imaging quality of the edge field of view, enhancing shooting capabilities in different environments, and achieving a TTL ≤ 2.9mm while ensuring a field of view (FOV) ≥ 108°.

[0159] A second aspect of this application provides an electronic device, comprising:

[0160] Ultra-wide-angle lenses, including:

[0161] A first lens 1, a second lens 2, a third lens 3, and a fourth lens 4 are arranged sequentially from the object side to the image side along the optical path;

[0162] The first lens 1 is a positive refractive power lens; the second lens 2 is a negative refractive power lens; the third lens 3 is a positive refractive power lens; and the fourth lens 4 is a negative refractive power lens.

[0163] The four lenses, through adjustments to their respective structural and / or optical parameters, ensure that the lens satisfies the following conditional relationship:

[0164] TTL≤2.9mm;

[0165] FOV ≥ 108°;

[0166] Where TTL is the total optical length; FOV is the field of view.

[0167] Specifically, the electronic device can be a smartphone, tablet, drone, action camera, surveillance camera, or AR / VR device, etc.

[0168] The electronic device provided in the second aspect of this application includes the ultra-wide-angle lens provided in the first aspect. This ultra-wide-angle lens converges light through a first lens 1 and a third lens 3 and guides it to subsequent lens assemblies, improving the system's light intake efficiency and light utilization. By adjusting the divergence of light through a second lens 2 and a fourth lens 4, more edge light rays can be guided into the lens, thereby expanding the field of view. The use of a lens configuration with alternating positive and negative refractive forces effectively expands the field of view while effectively suppressing various aberrations such as spherical aberration, coma, and distortion, significantly reducing various aberrations and ensuring high-quality images throughout the entire field of view. The four-element design reduces the number of lenses, simplifying system complexity and effectively reducing the number of optical components, thus lowering overall weight and manufacturing costs. By precisely controlling the optical and / or structural parameters of each lens, a TTL of ≤2.9mm is achieved while maintaining a field of view (FOV) ≥ 108°, enabling the miniaturization of this ultra-wide-angle lens.

[0169] The electronic device provided in the second aspect of this application, by integrating the ultra-wide-angle lens of the first aspect, achieves a field of view greater than or equal to 108° while maintaining a slim and lightweight design, thereby significantly expanding the shooting range and improving the edge imaging quality and overall sharpness of the image. The lens has a compact structure and a total optical length TTL ≤ 2.9mm, meeting the design requirements for miniaturization and portability of electronic devices.

[0170] The aspherical surfaces of each lens in Examples 1-3 can use the aspherical coefficients shown in the following formula. It should be understood that the present invention is not limited to the aspherical polynomial form expressed by this formula.

[0171]

[0172] The meanings of the symbols in Examples 1-3 are as follows:

[0173] S1 is the aperture; R1 is the object-side surface of the first lens 1; R2 is the image-side surface of the first lens 1; R3 is the object-side surface of the second lens 2; R4 is the image-side surface of the second lens 2; R5 is the object-side surface of the third lens 3; R6 is the image-side surface of the third lens 3; R7 is the object-side surface of the fourth lens 4; R8 is the image-side surface of the fourth lens 4; R9 is the object-side surface of the optical filter 5; R10 is the image-side surface of the optical filter 5.

[0174] d0 is the axial distance from the aperture to the object-side surface of the first lens 1. d1 is the axial thickness of the first lens 1. d2 is the axial distance from the image-side surface of the first lens 1 to the object-side surface of the second lens 2. d3 is the axial thickness of the second lens 2. d4 is the axial distance from the image-side surface of the second lens 2 to the object-side surface of the third lens 3. d5 is the axial thickness of the third lens 3. d6 is the axial distance from the image-side surface of the third lens 3 to the object-side surface of the fourth lens 4. d7 is the axial thickness of the fourth lens 4. d8 is the axial distance from the image-side surface of the fourth lens 4 to the object-side surface of the filter 5. d9 is the axial thickness of the filter 5. d10 is the axial distance from the image-side surface of the filter 5 to the image plane.

[0175] nd1 is the refractive index of the first lens 1 at the D-line wavelength. nd2 is the refractive index of the second lens 2 at the D-line wavelength. nd3 is the refractive index of the second lens 2 at the D-line wavelength. nd4 is the refractive index of the second lens 2 at the D-line wavelength. ndg is the refractive index of the filter 5 at the D-line wavelength.

[0176] K is the conic coefficient, and A4, A6, A8, A10, A12, A14, and A16 are all aspherical coefficients.

[0177] Example 1

[0178] like Figure 1 As shown, the total focal length f of the ultra-wide-angle lens in Example 1 is 1.637; the FOV is 108.20°; the TTL is 2.858mm; and the Fno is 2.207. Table 1 shows the relevant parameter design of each lens, aperture, and filter in Example 1.

[0179] Table 1 shows the design parameters of each lens, aperture, and filter in Example 1.

[0180]

[0181]

[0182] Table 2 shows the conic coefficients and aspherical coefficients of each lens in Example 1.

[0183]

[0184] Table 3 shows the values ​​for each conditional expression in Example 1. The optical lens of Example 1 satisfies all the parameters listed in the conditional expressions.

[0185] Table 3 shows the numerical values ​​of the conditional expressions corresponding to the optical lens in Example 1.

[0186]

[0187]

[0188] Figure 2 , Figure 3 The axial chromatic aberration and magnification chromatic aberration curves of light with wavelengths of 460nm, 546nm, and 650nm after passing through the ultra-wide-angle lens of Example 1 are shown in the figure. Figure 2 As can be seen, the defocus curves of light rays at various points on the aperture stop are relatively concentrated, indicating that the optical system has low sensitivity to assembly errors and environmental changes, and possesses good stability. From Figure 3 As can be seen, compared to the main wavelength of 546nm, the maximum magnification color difference of other wavelengths is less than 3um, demonstrating excellent color difference control capability, which helps to achieve high-precision color reproduction.

[0189] Figure 4 This is a schematic diagram showing the field curvature and distortion of light with wavelengths of 460nm, 546nm, and 650nm after passing through the ultra-wide-angle lens of Example 1. Figure 4 As can be seen, the system has small optical distortion, and the field curvatures of each wavelength basically coincide and are easy to correct, exhibiting excellent optical characteristics.

[0190] Example 2

[0191] like Figure 5 As shown, the total focal length f of the ultra-wide-angle lens in Example 2 is 1.651; the FOV is 108.04°; the TTL is 2.862mm; and the Fno is 2.202. Table 4 shows the relevant parameter designs for each lens, aperture, and filter in Example 2.

[0192] Table 4 shows the design parameters of each lens, aperture, and filter in Example 2.

[0193]

[0194] Table 5. Conic coefficients and aspherical coefficients of each lens in Example 2.

[0195]

[0196] Table 6 shows the values ​​for each conditional expression in Example 2. The optical lens of Example 2 satisfies all the parameters listed in the conditional expressions.

[0197] Table 6 shows the numerical values ​​of the conditions corresponding to the optical lens in Example 2.

[0198]

[0199]

[0200] Figure 6 , Figure 7 The axial chromatic aberration and magnification chromatic aberration curves of light with wavelengths of 460nm, 546nm, and 650nm after passing through the ultra-wide-angle lens of Example 1 are shown in the figure. Figure 6 As can be seen, the defocus curves of light rays at various points on the aperture stop are relatively concentrated, indicating that the optical system has low sensitivity to assembly errors and environmental changes, and possesses good stability. From Figure 7 As can be seen, compared to the main wavelength of 546nm, the maximum magnification color difference of other wavelengths is less than 3um, demonstrating excellent color difference control capability, which helps to achieve high-precision color reproduction.

[0201] Figure 8 This is a schematic diagram showing the field curvature and distortion of light with wavelengths of 460nm, 546nm, and 650nm after passing through the ultra-wide-angle lens of Example 1. Figure 8 As can be seen, the system has small optical distortion, and the field curvatures of each wavelength basically coincide and are easy to correct, exhibiting excellent optical characteristics.

[0202] Example 3

[0203] like Figure 9 As shown, the total focal length f of the ultra-wide-angle lens in Example 3 is 1.826; FOV is 109.36; TTL is 2.93mm; and Fno is 2.21. Table 7 shows the relevant parameter designs for each lens, aperture, and filter in Example 3.

[0204] Table 7 shows the design parameters of each lens, aperture, and filter in Example 3.

[0205]

[0206] Table 8 shows the conic coefficient and aspherical coefficient of each lens in Example 3.

[0207]

[0208] Table 9 shows the values ​​for each conditional expression in Example 3. The optical lens of Example 3 satisfies all the parameters listed in the conditional expressions.

[0209] Table 9 shows the numerical values ​​of the conditions corresponding to the optical lens in Example 3.

[0210] Conditional expression Example 1 2.4 ≤ f1 / f ≤ 2.6 2.568 -293≤f2 / f≤-88 -292.765 0.6 ≤ f³ / f ≤ 0.8 0.620 -1.2≤f⁴ / f≤-0.75 -0.759 0.08≤T1 / TTL≤0.10 0.082 0.05≤T2 / TTL≤0.08 0.061 0.30≤T3 / TTL≤0.35 0.301 0.08≤T4 / TTL≤0.12 0.084 -2.3≤(R1+R2) / (R1-R2)≤-1.5 -2.216 34.0≤(R3+R4) / (R3-R4)≤67.0 66.177 1.30≤(R5+R6) / (R5-R6)≤1.40; 1.342 2.2≤(R7+R8) / (R7-R8)≤2.7 2.247 1.50≤n1≤1.55； 1.537 1.60≤n2≤1.65； 1.633 1.50≤n3≤1.55； 1.537 1.65≤n4≤1.70； 1.656 2.8≤TTL≤2.95mm; 2.93 FOV≥108° 109.36° IH≥4.61mm 4.61 TTL / IH≤0.64 0.636

[0211] Figure 10 , Figure 11 The axial chromatic aberration and magnification chromatic aberration curves of light with wavelengths of 460nm, 546nm, and 650nm after passing through the ultra-wide-angle lens of Example 1 are shown in the figure. Figure 10 As can be seen, the defocus curves of light rays at various points on the aperture stop are relatively concentrated, indicating that the optical system has low sensitivity to assembly errors and environmental changes, and possesses good stability. From Figure 11As can be seen, compared to the main wavelength of 546nm, the maximum magnification color difference of other wavelengths is less than 3um, demonstrating excellent color difference control capability, which helps to achieve high-precision color reproduction.

[0212] Figure 12 This is a schematic diagram showing the field curvature and distortion of light with wavelengths of 460nm, 546nm, and 650nm after passing through the ultra-wide-angle lens of Example 1. Figure 12 As can be seen, the system has small optical distortion, and the field curvatures of each wavelength basically coincide and are easy to correct, exhibiting excellent optical characteristics.

[0213] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An ultra-wide-angle lens, characterized in that, include: A first lens, a second lens, a third lens, and a fourth lens are arranged sequentially from the object side to the image side along the optical path; The first lens is a positive refractive power lens; the second lens is a negative refractive power lens; the third lens is a positive refractive power lens; and the fourth lens is a negative refractive power lens. The four lenses, through adjustments to their respective structural and / or optical parameters, ensure that the lens satisfies the following conditional relationship: TTL≤2.9mm; FOV ≥ 108°; Where TTL is the total optical length; FOV is the field of view.

2. The ultra-wide-angle lens according to claim 1, characterized in that, The object-side surface of the first lens is convex, and the image-side surface of the first lens is concave. Both the object-side and image-side surfaces of the second lens are concave. The object-side surface of the third lens is concave, and the image-side surface of the third lens is convex. The object-side and image-side surfaces of the fourth lens are both concave.

3. The ultra-wide-angle lens according to claim 1, characterized in that, The following conditional relationship must be satisfied: 2.4 ≤ f1 / f ≤ 2.6; -293≤f2 / f≤-88; 0.6≤f³ / f≤0.8; -1.2≤f4 / f≤-0.7; Where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f is the total focal length of the lens.

4. The ultra-wide-angle lens according to claim 1, characterized in that, The following conditional relationship must be satisfied: 0.08≤T1 / TTL≤0.10; 0.05≤T2 / TTL≤0.08; 0.30≤T3 / TTL≤0.35; 0.08≤T4 / TTL≤0.12; Wherein, T1 is the on-axis thickness of the first lens, T2 is the on-axis thickness of the second lens, T3 is the on-axis thickness of the third lens, and T4 is the on-axis thickness of the fourth lens.

5. The ultra-wide-angle lens according to claim 1, characterized in that, The following conditional relationship must be satisfied: 1.50≤n1≤1.55； 1.60≤n2≤1.65； 1.50≤n3≤1.55； 1.65≤n4≤1.70； Wherein, n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, and n4 is the refractive index of the fourth lens.

6. The ultra-wide-angle lens according to claim 1, characterized in that, The following conditional relationship must be satisfied: -2.3≤(R1+R2) / (R1-R2)≤-1.5; 34.0≤(R3+R4) / (R3-R4)≤67.0; 1.3≤(R5+R6) / (R5-R6)≤1.4; 2.2≤(R7+R8) / (R7-R8)≤2.7; 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, 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.

7. The ultra-wide-angle lens according to claim 1, characterized in that, The following conditional relationship must be satisfied: 45≤v1≤60； 17≤v2≤30； 45≤v3≤60； 17≤v4≤30； Wherein, v1 is the dispersion coefficient of the first lens, v2 is the dispersion coefficient of the second lens, v3 is the dispersion coefficient of the third lens, and v4 is the dispersion coefficient of the fourth lens.

8. The ultra-wide-angle lens according to claim 1, characterized in that, The following conditional relationship must be satisfied: Φ≤3.70mm; and / or, Fno≤2.21; and / or, IH ≥ 4.61; Where Φ is the maximum effective diameter of each lens; Fno is the aperture number of the lens; and IH is the imaging height of the lens.

9. The ultra-wide-angle lens according to claim 1, characterized in that, All four lenses are aspherical lenses; and / or, all four lenses are made of plastic.

10. An electronic device, comprising: include: Ultra-wide-angle lenses, including: A first lens, a second lens, a third lens, and a fourth lens are arranged sequentially from the object side to the image side along the optical path; The first lens is a positive refractive power lens; the second lens is a negative refractive power lens; the third lens is a positive refractive power lens; and the fourth lens is a negative refractive power lens. The four lenses, through adjustments to their respective structural and / or optical parameters, ensure that the lens satisfies the following conditional relationship: TTL≤2.9mm; FOV ≥ 108°; Where TTL is the total optical length; FOV is the field of view.

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