Optical lens and electronic equipment

Abstract

The invention provides an optical lens and electronic equipment. The optical lens comprises a first lens with negative focal power; the second lens has positive focal power or negative focal power, and the second side surface of the second lens is a concave surface; the third lens has positive focal power, and the second side surface of the third lens is a convex surface; the fourth lens has positive focal power, and at least one of the first side surface and the second side surface of the fourth lens is a convex surface; the distance d7 between the axis of the third lens and the axis of the fourth lens and the total optical length TTL of the optical lens meet the condition that d7 / TTL is larger than or equal to 0.07 and smaller than or equal to 0.3; the distance d2 between the axis of the first lens and the axis of the second lens and TTL meet the condition that d2 / TTL is smaller than or equal to 0.05. And the optical back focus BFL and TTL of the optical lens meet the condition that BFL / TTL is greater than or equal to 0.3 and less than or equal to 0.55. According to the invention, the problem that high resolution, small telecentricity and long back focus of an optical lens in the prior art are difficult to consider at the same time is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to an optical lens and an electronic device. Background Art

[0002] With the continuous development of science and technology, the demand for optical lenses in daily life is increasing, and optical lenses are also applied to more and more scenarios. For example, in the field of intelligent driving, especially in car projection, in order to meet the diverse and personalized driving experience of users, cars are usually equipped with projectors to achieve virtual display. As an important component of the projector, optical lenses play a key role in car display technology.

[0003] With the continuous advancement of DMD chip and LCOS chip technology, the requirements for optical lenses are also increasing. The current automotive optical lenses are also developing in the direction of small size, high resolution and small telecentricity to meet the growing demand for in-vehicle displays. At present, optical lenses used in automobiles for projection are facing a series of technical challenges. First, with the improvement of the resolution of DMD chips and LCOS chips, the requirements for the resolution of optical lenses are also increasing, but the resolution of current optical lenses is not high and cannot match the chips. Secondly, the telecentricity of current optical lenses is not small enough, resulting in a waste of light efficiency. In addition, the back focus of current optical lenses is not long enough, making it difficult to leave enough space for debugging and installation of other devices.

[0004] That is to say, the optical lens in the prior art has the problem that it is difficult to achieve high resolution, small telecentricity and long back focus at the same time. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical lens and an electronic device to solve the problem that the optical lens in the prior art has difficulty in taking high resolution, small telecentricity and long back focus into consideration at the same time. Furthermore, the present application can also meet , telecentricity ≤2° and distortion ≤5%.

[0006] In order to achieve the above-mentioned object, the present invention provides an optical lens, which comprises, from the first side to the second side, in sequence: a first lens with negative optical power; a second lens with positive optical power or negative optical power, the second side surface of the second lens is a concave surface; a third lens with positive optical power, the second side surface of the third lens is a convex surface; a fourth lens with positive optical power, at least one of the first side surface and the second side surface of the fourth lens is a convex surface; the axial spacing d7 between the third lens and the fourth lens and the optical total length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface satisfies: 0.07≤d7 / TTL≤0.3; the axial spacing d2 between the first lens and the second lens and TTL satisfies: d2 / TTL≤0.05; the optical back focus of the optical lens, that is, the center distance BFL from the center of the second side of the fourth lens of the optical lens to the imaging surface and TTL satisfies: 0.55≥BFL / TTL≥0.3.

[0007] According to another aspect of the present invention, an electronic device is provided, comprising the above-mentioned optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0008] By applying the technical solution of the present invention, the first lens has negative optical power, which is beneficial to properly diffuse the light, reduce the system sensitivity, and reduce the front port diameter of the optical lens, reducing the volume, which is beneficial to miniaturization and cost reduction.

[0009] The second lens has positive or negative focal power, and the second side surface of the second lens is concave. When the second lens has positive focal power and the first side surface of the second lens is convex, it can converge the large field of view light of the first lens, lengthen the back focus, and make the light transition smoothly. When the second lens has negative focal power and the first side surface of the second lens is convex, flat or concave, the negative focal power is conducive to proper diffusion of light, reducing system sensitivity, and reducing the front port diameter of the optical lens, reducing the volume, and facilitating miniaturization and cost reduction.

[0010] The third lens has positive focal length, which is beneficial to the convergence of light and allows the divergent light to enter the rear smoothly. The second side of the third lens is a convex surface. When the first side of the third lens is a convex surface, the shape of the third lens is double convex and the lens shape is flat, which is beneficial to reduce the sensitivity of the system, further make the light trend transition smoothly, and cooperate with the fourth lens to correct the telecentricity. When the first side of the third lens is a plane, it further makes the light trend transition smoothly, corrects the aberration of the front group lens, and cooperates with the fourth lens to correct the telecentricity. When the first side of the third lens is a concave surface, it further makes the light trend transition smoothly, corrects the aberration of the front group lens, and cooperates with the fourth lens to correct the telecentricity.

[0011] The fourth lens has positive focal power, which is beneficial to converge light to the imaging surface. By planning at least one of the first side surface and the second side surface of the fourth lens to be a convex surface, it is beneficial to improve the resolution and achieve a small CRA.

[0012] By constraining 0.07≤d7 / TTL≤0.3, it is helpful to reasonably allocate the air space between the third lens and the fourth lens, so that the light of the rear group transitions smoothly, improve the resolution of the edge light, and achieve long back focus and small telecentricity to match the lighting system. By constraining d2 / TTL≤0.05, it is helpful to control the air space between the first lens and the second lens, so that the light transitions to the imaging surface more compactly to achieve miniaturization. By constraining 0.55≥BFL / TTL≥0.3, it is helpful to meet the special requirements of the back focal length, and it can also reserve space for the installation and focusing of other optical components to avoid interference between mechanisms.

[0013] The present application adopts four lenses, and by optimizing the optical focal length and surface shape of each lens and constraining the above-mentioned conditional formula, the optical lens of the present invention has at least one beneficial effect of high resolution, small telecentricity, long back focus, miniaturization, and small front port diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0015] Figure 1 A schematic structural diagram of an optical lens according to Example 1 of the present invention is shown;

[0016] Figure 2 A schematic structural diagram of an optical lens according to Example 2 of the present invention is shown;

[0017] Figure 3 A schematic diagram showing the structure of an optical lens according to Example 3 of the present invention is shown;

[0018] Figure 4 A schematic diagram showing the structure of an optical lens according to Example 4 of the present invention is shown;

[0019] Figure 5 A schematic diagram showing the structure of an optical lens according to Example 5 of the present invention is shown;

[0020] Figure 6 A schematic diagram showing the structure of an optical lens according to Example 6 of the present invention is shown;

[0021] Figure 7 A schematic diagram showing the structure of an optical lens according to Example 7 of the present invention is shown;

[0022] Figure 8A schematic diagram showing the structure of an optical lens according to Example 8 of the present invention is shown;

[0023] Fig. 9 A schematic diagram showing the structure of an optical lens according to Example 9 of the present invention is shown;

[0024] Fig.10 A schematic diagram showing the structure of an optical lens according to Example 10 of the present invention is shown;

[0025] Fig.11 A schematic diagram showing the structure of an optical lens according to Example 11 of the present invention is shown;

[0026] Fig.12 A schematic structural diagram of an optical lens according to Example 12 of the present invention is shown;

[0027] Fig.13 A schematic diagram showing the structure of an optical lens according to Example 13 of the present invention is shown;

[0028] Fig.14 A schematic structural diagram of an optical lens according to Example 14 of the present invention is shown;

[0029] Fig.15 A schematic diagram showing the structure of an optical lens according to Example 15 of the present invention is shown;

[0030] Fig.16 A schematic diagram showing the structure of an optical lens according to Example 16 of the present invention is shown;

[0031] Fig.17 A schematic diagram showing the structure of an optical lens according to Example 17 of the present invention is shown;

[0032] Fig.18 A schematic diagram showing the structure of an optical lens according to Example 18 of the present invention is shown;

[0033] Fig.19 A schematic diagram showing the structure of an optical lens according to Example 19 of the present invention is shown;

[0034] Fig. 20 A schematic diagram showing the structure of an optical lens according to Example 20 of the present invention is shown;

[0035] Fig.21 A schematic structural diagram of an optical lens according to Example 21 of the present invention is shown;

[0036] Fig. 22 A schematic structural diagram of an optical lens according to Example 22 of the present invention is shown;

[0037] Fig.23 A schematic structural diagram of an optical lens according to Example 23 of the present invention is shown;

[0038] Fig.24A schematic structural diagram of an optical lens according to Example 24 of the present invention is shown;

[0039] Fig.25 A schematic structural diagram of an optical lens according to Example 25 of the present invention is shown;

[0040] Fig.26 A schematic structural diagram of an optical lens according to Example 26 of the present invention is shown;

[0041] Fig. 27 A schematic structural diagram of an optical lens according to Example 27 of the present invention is shown;

[0042] Fig.28 A schematic structural diagram of an optical lens according to Example 28 of the present invention is shown;

[0043] Fig.29 The MTF curve diagram of the optical lens of Example 1 of the present invention is shown;

[0044] Fig.30 The MTF curve graph of the optical lens of Example 17 of the present invention is shown.

[0045] The above drawings include the following reference numerals:

[0046] L1, first lens; S1, first side surface of the first lens; S2, second side surface of the first lens; L2, second lens; S3, first side surface of the second lens; S4, second side surface of the second lens; STO, aperture; L3, third lens; S5, first side surface of the third lens; S6, second side surface of the third lens; L4, fourth lens; S7, first side surface of the fourth lens; S8, second side surface of the fourth lens; IMA, imaging surface. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0048] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0049] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0050] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0051] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0052] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens close to the first side is called the first side of the lens, and the surface of each lens close to the second side is called the second side of the lens. The judgment of the surface shape in the paraxial region can be based on the judgment method of the general knowledgeable person in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial region, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the concave and convex. For the first side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the second side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0053] It should be noted that the left side of the optical lens is the first side, and the right side of the optical lens is the second side. In an exemplary embodiment, the optical lens provided in the present application can be used as a vehicle-mounted lens. For a vehicle-mounted lens, the left side is the object side, and the right side is the image side; the first side is the object side, and the second side is the image side. Light from the object side can be imaged on the image side. When the optical lens of the present application is applied to a projection lens or a radar transmitting lens, the left side is the imaging side, and the right side is the image source side. In an exemplary embodiment, the optical lens provided in the present application can be used as, for example, a projection lens or a laser radar transmitting end lens. At this time, the image side of the optical lens can be the image source side, and the object side can be the imaging side. Light from the image source side can be imaged on the imaging side, and the imaging surface of the optical lens is the image source surface.

[0054] In order to solve the problem that the optical lens in the prior art has high resolution, small telecentricity and long back focus, the present invention provides an optical lens and an electronic device. Furthermore, the present application can also meet the requirements of , telecentricity ≤2° and distortion ≤5%.

[0055] like Figures 1 to 30As shown, the optical lens comprises, from the first side to the second side, in sequence: a first lens with negative optical power; a second lens with positive optical power or negative optical power, the second side surface of the second lens is a concave surface; a third lens with positive optical power, the second side surface of the third lens is a convex surface; a fourth lens with positive optical power, at least one of the first side surface and the second side surface of the fourth lens is a convex surface; the axial spacing d7 between the third lens and the fourth lens and the optical total length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface satisfies: 0.07≤d7 / TTL≤0.3; the axial spacing d2 between the first lens and the second lens and TTL satisfies: d2 / TTL≤0.05; the optical back focus of the optical lens, that is, the center distance BFL from the center of the second side of the fourth lens of the optical lens to the imaging surface and TTL satisfies: 0.55≥BFL / TTL≥0.3.

[0056] The first lens has negative optical power, which is beneficial to properly diffuse the light, reduce system sensitivity, reduce the front port diameter of the optical lens, reduce the volume, and is beneficial to miniaturization and cost reduction.

[0057] The second lens has positive or negative focal power, and the second side surface of the second lens is concave. When the second lens has positive focal power and the first side surface of the second lens is convex, it can converge the large field of view light of the first lens, lengthen the back focus, and make the light transition smoothly. When the second lens has negative focal power and the first side surface of the second lens is convex, flat or concave, the negative focal power is conducive to proper diffusion of light, reducing system sensitivity, and reducing the front port diameter of the optical lens, reducing the volume, and facilitating miniaturization and cost reduction.

[0058] The third lens has positive focal length, which is beneficial to the convergence of light and allows the divergent light to enter the rear smoothly. The second side of the third lens is a convex surface. When the first side of the third lens is a convex surface, the shape of the third lens is double convex and the lens shape is flat, which is beneficial to reduce the sensitivity of the system, further make the light trend transition smoothly, and cooperate with the fourth lens to correct the telecentricity. When the first side of the third lens is a plane, it further makes the light trend transition smoothly, corrects the aberration of the front group lens, and cooperates with the fourth lens to correct the telecentricity. When the first side of the third lens is a concave surface, it further makes the light trend transition smoothly, corrects the aberration of the front group lens, and cooperates with the fourth lens to correct the telecentricity.

[0059] The fourth lens has positive focal power, which is beneficial to converge light to the imaging surface. By planning at least one of the first side surface and the second side surface of the fourth lens to be a convex surface, it is beneficial to improve the resolution and achieve a small CRA.

[0060] By constraining 0.07≤d7 / TTL≤0.3, it is helpful to reasonably distribute the air space between the third lens and the fourth lens, so that the light of the rear group transitions smoothly, improves the resolution of the edge light, and achieves a long back focus and a small telecentricity to match the lighting system. By constraining d2 / TTL≤0.05, it is helpful to control the air space between the first lens and the second lens, so that the light transitions to the imaging surface more compactly to achieve miniaturization. By constraining 0.55≥BFL / TTL≥0.3, it is helpful to meet the special requirements of the back focal length, and it can also reserve space for the installation and focusing of other optical elements to avoid interference between mechanisms. Preferably, 0.072≤d7 / TTL≤0.25. Preferably, d2 / TTL≤0.042. Preferably, 0.5≥BFL / TTL≥0.32.

[0061] The present application adopts four lenses, and by optimizing the optical power and surface shape of each lens and constraining the above conditional formula, the optical lens of the present invention has at least one beneficial effect of high resolution, small telecentricity, long back focus, miniaturization, and small front port diameter. In addition, when the optical lens of the present application adopts all-glass material, the resolution of the optical lens is little affected by high and low temperature conditions.

[0062] In this embodiment, the first side of the first lens is concave, and the second side is concave. The double concave shape allows the first lens to collect as much light as possible from a large field of view into the rear optical system, and fix the direction of the light at a large angle at the edge. Alternatively, the first side of the first lens is convex, and the second side is concave. The first side is designed to be convex, which is conducive to the sliding of water droplets and dust in practical applications, reducing the impact on imaging. Alternatively, the first side of the first lens is concave, and the second side is a plane. In this way, the first lens can collect as much light as possible from a large field of view into the rear optical system, and fix the direction of the light at a large angle at the edge. Alternatively, the first side of the first lens is a plane, and the second side is a concave. In this way, the light from a large field of view can be collected as much as possible to enter the rear optical system, and the direction of the light from a large angle at the edge can be fixed. The first lens preferably uses a high refractive index material, which is conducive to reducing the front port diameter and improving the imaging quality. Alternatively, the first side of the first lens is concave, and the second side is convex. This is conducive to achieving divergence after collecting light from a large field of view, which is conducive to reducing the front port diameter and improving the imaging quality.

[0063] In this embodiment, the second lens has positive focal power, and the first side surface of the second lens is convex. The second lens is set to have a positive focal power that can converge the large field of view light of the first lens, lengthen the back focus, and make the light transition smoothly. Alternatively, the second lens has a negative focal power, and the first side surface of the second lens is convex. Alternatively, the second lens has a negative focal power, and the first side surface of the second lens is a plane. Alternatively, the second lens has a negative focal power, and the first side surface of the second lens is a concave surface. Negative focal power is conducive to proper diffusion of light, reducing system sensitivity, and can reduce the front port diameter of the lens, reduce the volume, and is conducive to miniaturization and cost reduction.

[0064] In this embodiment, the first side surface of the third lens is a convex surface. The shape of the third lens is biconvex and the lens shape is gentle, which is conducive to reducing the sensitivity of the system, further making the light trend transition smoothly, and cooperating with the fourth lens to correct the telecentricity. Alternatively, the first side surface of the third lens is a plane. Alternatively, the first side surface of the third lens is a concave surface. This arrangement can make the divergent light enter the rear smoothly, further make the light trend transition smoothly, correct the front group aberration, and cooperate with the fourth lens to correct the telecentricity.

[0065] In this embodiment, the first side surface of the fourth lens is convex, and the second side surface is convex. Alternatively, the first side surface of the fourth lens is convex, and the second side surface is concave. Alternatively, the first side surface of the fourth lens is concave, and the second side surface is convex. By rationally planning the surface shape of the fourth lens and matching it with positive focal power, it is beneficial to converge light to the image plane, improve resolution, and achieve a small CRA.

[0066] In this embodiment, the optical lens also includes an aperture, which is located between the first lens and the second lens or between the second lens and the third lens. By rationally planning the position of the aperture, it is beneficial to effectively converge the light entering the optical system, reduce the lens aperture at the rear end of the optical system, and reduce the assembly sensitivity of the system.

[0067] In this embodiment, at least one of the third lens and the fourth lens is an aspherical lens. Reasonable arrangement of the aspherical lens is beneficial to correcting field curvature and improving resolution.

[0068] In this embodiment, the focal length value F3 of the third lens and the focal length value F of the entire optical lens group satisfy: 0.6≤F3 / F≤1.8. Meeting this conditional expression is conducive to collecting the front group of light, facilitating smooth transition of light, facilitating lengthening of the back focus, and having enough space to match the lighting system. Preferably, 0.8≤F3 / F≤1.65.

[0069] In this embodiment, the center thickness d1 of the first lens, the axial spacing d2 between the first lens and the second lens, the center thickness d3 of the second lens and the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface, satisfy the following conditions: 0.01≤(d1+d2+d3) / TTL≤0.3. This conditional expression is constrained to ensure that the first lens and the second lens are compact in structure, reduce the edge light turning optical path, eliminate the edge light aberration, and improve the edge resolution. Preferably, 0.02≤(d1+d2+d3) / TTL≤0.285.

[0070] In this embodiment, the center radius of curvature R6 of the second side surface of the third lens and the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface satisfy: 0≥R6 / TTL≥-0.5. The second side surface of the third lens is a convex surface, and the curvature needs to be appropriately curved to balance the spherical aberration of the front group and to suppress the light entering the fourth lens, so as to achieve a long back focus. Preferably, 0≥R6 / TTL≥-0.3.

[0071] In this embodiment, the maximum effective aperture D of the first side surface of the first lens and the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface, satisfy the following: 0.4 ≥ D / TTL ≥ 0.02. Satisfying this conditional expression is conducive to ensuring the small aperture of the front end and is conducive to miniaturization of the size. Preferably, 0.3 ≥ D / TTL ≥ 0.05.

[0072] In this embodiment, the central curvature radius R4 of the second side surface of the second lens satisfies the following relationship with the focal length F of the entire optical lens set: 0.2≤R4 / F≤6.5. Satisfying this conditional expression helps the light rays to diverge toward the image plane and balances the aberration of the second side surface of the second lens. Preferably, 0.25≤R4 / F≤6.

[0073] In this embodiment, the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface, and the focal length value F of the entire group of the optical lens satisfy the following relationship: 2≤TTL / F≤5. When this condition is satisfied, miniaturization can be achieved. If TTL / F is too small, the system sensitivity will be high. When TTL / F is large, it is beneficial to the resolution and system sensitivity, but the overall size is large. Therefore, a range of cost, miniaturization, system resolution and sensitivity protection is considered. Preferably, 3≤TTL / F≤4.

[0074] In this embodiment, the optical lens satisfies at least one of the following conditions:

[0075] The maximum field of view FOV of the optical lens, the focal length value F of the entire set of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy the following conditions: 70≥(FOV×F) / H≥45; satisfying 70≥(FOV×F) / H≥45 can satisfy both telephoto and large field of view. Preferably, 65≥(FOV×F) / H≥50. The maximum field of view FOV is associated with the image height H, which is the field of view corresponding to the image height.

[0076] The maximum effective aperture D of the first side surface of the first lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following conditions: 0.005≤D / H / FOV≤0.1. When 0.005≤D / H / FOV≤0.1 is satisfied, the optical lens can be provided with the characteristics of a large target surface and a small aperture under the condition of a fixed focal length. Preferably, 0.01≤D / H / FOV≤0.08. The maximum field of view FOV is associated with the image height H, which is the field of view angle corresponding to the image height.

[0077] In this embodiment, the central curvature radius R3 of the first side surface of the second lens when it is convex or concave and the central curvature radius R4 of the second side surface of the second lens satisfy: 0.55≤|R3 / R4|≤2.5. Meeting this conditional expression is conducive to a smooth transition of light trends and reduces system sensitivity. Preferably, 0.60≤|R3 / R4|≤2. It should be noted here that R3 is the central curvature radius of the first side surface of the second lens when it is convex or concave, excluding planes.

[0078] In this embodiment, the focal length value F of the entire optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: 1≤F / H≤3. Satisfying this conditional expression is conducive to controlling the focal length and image height within a certain range, which is conducive to improving the resolution. Preferably, 1.5≤F / H≤2.3.

[0079] In this embodiment, the optical lens satisfies at least one of the following conditions:

[0080] The focal length value F of the entire optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F / ENPD≤3.0; satisfying F / ENPD≤3.0 is conducive to increasing the amount of light passing. Preferably, F / ENPD≤2.6.

[0081] The aperture diameter DST of the optical lens and the focal length F of the entire optical lens group satisfy: 0.2≤DST / F≤0.8; 0.2≤DST / F≤0.8 is satisfied, so that the larger the ratio of the aperture diameter to the effective focal length, the larger the aperture of the optical lens. Preferably, 0.3≤DST / F≤0.55.

[0082] The central curvature radius R7 of the first side surface of the fourth lens and the central curvature radius R8 of the second side surface of the fourth lens satisfy: 0.1≤|R7 / R8|≤5; satisfying 0.1≤|R7 / R8|≤5 is conducive to the fourth lens collecting more light and increasing the light transmission capacity of the system. Preferably, 0.2≤|R7 / R8|≤4.5.

[0083] The image height H corresponding to the maximum field of view of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: H / ENPD≤1.7. When H / ENPD≤1.7 is satisfied, the width of the light beam incident on the optical lens can be increased, so that the brightness of the optical lens at the image plane is improved to avoid dark corners and improve relative illumination. Preferably, H / ENPD≤1.53.

[0084] In this embodiment, the maximum effective aperture D of the first side surface of the first lens, the image height H corresponding to the maximum field angle of the optical lens, and the focal length F of the entire optical lens group satisfy: D / H / F≤0.18. When this conditional expression is satisfied, the optical lens can be provided with the characteristics of a large target surface and a small aperture under the condition of a fixed focal length. Preferably, 0.02≤D / H / F≤0.12.

[0085] In this embodiment, the optical back focus of the optical lens, that is, the distance BFL from the center of the second side of the fourth lens of the optical lens to the center of the imaging surface and the distance TL from the center of the first side of the first lens to the center of the second side of the fourth lens, satisfies: 1≥BFL / TL≥0.3. Satisfying this conditional formula ensures the back focus length while achieving miniaturization, which is beneficial to the assembly of the module. Preferably, 0.9≥BFL / TL≥0.4.

[0086] Optionally, the optical lens may further include a color filter for correcting color deviation and a protective glass for protecting a photosensitive element located on the imaging surface.

[0087] The optical lens in the present application may use multiple lenses, such as the four lenses mentioned above. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on imaging quality, the number of aspherical lenses can be increased. The characteristics of aspherical lenses are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike spherical lenses with constant curvature from the center of the lens to the periphery of the lens, aspherical lenses have better curvature radius characteristics, and have the advantages of improving distortion aberrations and improving astigmatism aberrations. After using aspherical lenses, the aberrations that occur during imaging can be eliminated as much as possible, thereby improving imaging quality.

[0088] In an exemplary embodiment, the present solution does not limit the plastic and glass of the lens. If the focus is on temperature performance, the first lens, the second lens, the third lens, and the fourth lens can all be glass lenses. An optical lens made of glass can suppress the deviation of the back focus of the optical lens with temperature changes to improve the stability of the system. At the same time, the use of glass material can avoid the lens imaging blur caused by high and low temperature changes in the use environment, which affects the normal use of the optical lens. For example, the temperature range of the optical lens with an all-glass design is wider, and stable optical performance can be maintained in the range of -40°C to 105°C. Specifically, when focusing on resolution quality and reliability, the first lens to the fourth lens can all be glass aspherical lenses. Of course, in applications where temperature stability requirements are lower, the first lens to the fourth lens in the optical lens can also be made of plastic. Using plastic to make optical lenses can effectively reduce production costs. Of course, the first lens to the fourth lens in the optical lens can also be made of a combination of plastic and glass.

[0089] The present application also provides an electronic device, comprising the above-mentioned optical lens and an imaging element that converts an optical image formed by the optical lens into an electrical signal. The imaging element may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The electronic device may be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The electronic device is equipped with the above-described optical lens.

[0090] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical lens can be changed to obtain the various results and advantages described in this specification. For example, although four lenses are described as an example in the embodiments, the optical lens is not limited to including four lenses. If necessary, the optical lens may also include other numbers of lenses.

[0091] The following further describes examples of specific surface shapes and parameters of the optical lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0092] It should be noted that any one of the following examples 1 to 28 is applicable to all embodiments of the present application.

[0093] Example 1

[0094] like Figure 1 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 1. Figure 1 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0095] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is convex, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0096] In this example, the total effective focal length F of the optical lens is 13.488 mm, the maximum field of view FOV of the optical lens is 32.415°, and the total optical length TTL of the optical lens is 49.997 mm.

[0097] Table 1 shows a basic structural parameter table of the optical lens of Example 1, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0098] Table 1

[0099]

[0100] In Example 1, the surface shape of each aspheric lens can be defined by but not limited to the following aspheric formula:

[0101] Formula (1)

[0102] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; A, B, C, and D are all high-order coefficients. Table 2 below shows the cone coefficient k and the high-order coefficients A, B, C, and D that can be used for the aspheric lens surfaces S5 and S6 in Example 1.

[0103] Table 2

[0104]

[0105] Fig.29 The MTF curve of the optical lens of this example is shown. It can be seen from the figure that the MTF curve is relatively flat, the imaging consistency from the central field of view to the edge field of view is good, and the curves at different spatial frequencies are higher, and the performance is better. Of course, the architectures in other examples of this application can also achieve similar performance.

[0106] Example 2

[0107] like Figure 2 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 2. Figure 2 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0108] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is convex, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0109] In this example, the total effective focal length F of the optical lens is 13.498 mm, the maximum field of view FOV of the optical lens is 32.393°, and the total optical length TTL of the optical lens is 50.030 mm.

[0110] Table 3 shows the basic structural parameters of the optical lens of Example 2, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0111] Table 3

[0112]

[0113] Table 4 below shows the cone coefficient k and the higher-order coefficients A, B, C, and D that can be used for the aspheric lens surfaces S5 and S6 in Example 2.

[0114] Table 4

[0115]

[0116] Example 3

[0117] like Figure 3 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 3. Figure 3 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0118] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0119] In this example, the total effective focal length F of the optical lens is 13.493 mm, the maximum field of view FOV of the optical lens is 32.493°, and the total optical length TTL of the optical lens is 50.012 mm.

[0120] Table 5 shows a basic structural parameter table of the optical lens of Example 3, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0121] Table 5

[0122]

[0123] Table 6 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, and E that can be used for the aspheric lens surfaces S5 and S6 in Example 3.

[0124] Table 6

[0125]

[0126] Example 4

[0127] like Figure 4 As shown in FIG. 4 , it is a schematic diagram of the optical lens structure of Example 4. Figure 4 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0128] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0129] In this example, the total effective focal length F of the optical lens is 13.487 mm, the maximum field of view FOV of the optical lens is 32.508°, and the total optical length TTL of the optical lens is 50.000 mm.

[0130] Table 7 shows the basic structural parameter table of the optical lens of Example 4, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0131] Table 7

[0132]

[0133] Table 8 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, and E that can be used for the aspheric lens surfaces S5 and S6 in Example 4.

[0134] Table 8

[0135]

[0136] Example 5

[0137] like Figure 5 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 5. Figure 5 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0138] The first lens L1 has negative power, the first side surface S1 of the first lens is a plane, and the second side surface S2 of the first lens is a concave surface. The second lens L2 has positive power, the first side surface S3 of the second lens is a convex surface, and the second side surface S4 of the second lens is a concave surface. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is a convex surface. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is a convex surface, and the second side surface S8 of the fourth lens is a convex surface.

[0139] In this example, the total effective focal length F of the optical lens is 13.607 mm, the maximum field of view FOV of the optical lens is 32.227°, and the total optical length TTL of the optical lens is 49.472 mm.

[0140] Table 9 shows the basic structural parameter table of the optical lens of Example 5, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0141] Table 9

[0142]

[0143] Table 10 below shows the cone coefficient k and the higher-order coefficients A, B, C, and D that can be used for the aspherical lens surfaces S5-S8 in Example 5.

[0144] Table 10

[0145]

[0146] Example 6

[0147] like Figure 6 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 6. Figure 6 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0148] The first lens L1 has negative power, the first side surface S1 of the first lens is a plane, and the second side surface S2 of the first lens is a concave surface. The second lens L2 has positive power, the first side surface S3 of the second lens is a convex surface, and the second side surface S4 of the second lens is a concave surface. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is a convex surface. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is a convex surface, and the second side surface S8 of the fourth lens is a convex surface.

[0149] In this example, the total effective focal length F of the optical lens is 13.624 mm, the maximum field of view FOV of the optical lens is 32.186°, and the total optical length TTL of the optical lens is 49.391 mm.

[0150] Table 11 shows the basic structural parameter table of the optical lens of Example 6, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0151] Table 11

[0152]

[0153] Table 12 below shows the cone coefficient k and the higher-order coefficients A, B, C, and D that can be used for the aspherical lens surfaces S5-S8 in Example 6.

[0154] Table 12

[0155]

[0156] Example 7

[0157] like Figure 7 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 7. Figure 7As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0158] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0159] In this example, the total effective focal length F of the optical lens is 13.509 mm, the maximum field of view FOV of the optical lens is 32.286°, and the total optical length TTL of the optical lens is 50.014 mm.

[0160] Table 13 shows the basic structural parameter table of the optical lens of Example 7, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0161] Table 13

[0162]

[0163] Table 14 below shows the cone coefficient k and the higher-order coefficients A, B, C, and D that can be used for the aspherical lens surfaces S5-S8 in Example 7.

[0164] Table 14

[0165]

[0166] Example 8

[0167] like Figure 8 As shown in FIG. 8 , it is a schematic diagram of the optical lens structure of Example 8. Figure 8 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0168] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0169] In this example, the total effective focal length F of the optical lens is 13.529 mm, the maximum field of view FOV of the optical lens is 32.248°, and the total optical length TTL of the optical lens is 49.998 mm. Table 15 shows the basic structural parameter table of the optical lens of Example 8, where the units of the radius of curvature Radius and the thickness / distance are both millimeters (mm).

[0170] Table 15

[0171]

[0172] Table 16 below shows the cone coefficient k and the higher-order coefficients A, B, C, and D that can be used for the aspherical lens surfaces S5-S8 in Example 8.

[0173] Table 16

[0174]

[0175] Example 9

[0176] like Fig. 9 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 9. Fig. 9 As shown, the optical lens includes, from the first side to the second side, a first lens L1, an aperture STO, a second lens L2, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0177] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0178] In this example, the total effective focal length F of the optical lens is 13.553 mm, the maximum field of view FOV of the optical lens is 32.966°, and the total optical length TTL of the optical lens is 50.126 mm. Table 17 shows the basic structural parameter table of the optical lens of Example 9, where the units of the radius of curvature Radius and the thickness / distance are both millimeters (mm).

[0179] Table 17

[0180]

[0181] Table 18 below shows the cone coefficient k and the higher-order coefficients A, B, C, and D that can be used for the aspherical lens surfaces S5 and S6 in Example 9.

[0182] Table 18

[0183]

[0184] Example 10

[0185] like Fig.10 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 10. Fig.10 As shown, the optical lens includes, from the first side to the second side, a first lens L1, an aperture STO, a second lens L2, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0186] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0187] In this example, the total effective focal length F of the optical lens is 13.517 mm, the maximum field of view FOV of the optical lens is 33.030°, and the total optical length TTL of the optical lens is 49.908 mm.

[0188] Table 19 shows the basic structural parameter table of the optical lens of Example 10, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0189] Table 19

[0190]

[0191] Table 20 below shows the cone coefficient k and the higher-order coefficients A, B, C, and D that can be used for the aspherical lens surfaces S5 and S6 in Example 10.

[0192] Table 20

[0193]

[0194] Example 11

[0195] like Fig.11 As shown in FIG. 11 , it is a schematic diagram of the optical lens structure of Example 11. Fig.11 As shown, the optical lens includes, from the first side to the second side, a first lens L1, an aperture STO, a second lens L2, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0196] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0197] In this example, the total effective focal length F of the optical lens is 13.429 mm, the maximum field of view FOV of the optical lens is 33.114°, and the total optical length TTL of the optical lens is 50.038 mm.

[0198] Table 21 shows the basic structural parameter table of the optical lens of Example 11, wherein the units of the radius of curvature Radius and the thickness / distance are both millimeters (mm).

[0199] Table 21

[0200]

[0201] Table 22 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, E, and F that can be used for the aspheric lens surfaces S5-S8 in Example 11.

[0202] Table 22

[0203]

[0204] Example 12

[0205] like Fig.12 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 12. Fig.12As shown, the optical lens includes, from the first side to the second side, a first lens L1, an aperture STO, a second lens L2, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0206] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is concave. The second lens L2 has positive power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0207] In this example, the total effective focal length F of the optical lens is 13.418 mm, the maximum field of view FOV of the optical lens is 33.171°, and the total optical length TTL of the optical lens is 50.021 mm.

[0208] Table 23 shows the basic structural parameter table of the optical lens of Example 12, wherein the units of the radius of curvature Radius and the thickness / distance are both millimeters (mm).

[0209] Table 23

[0210]

[0211] Table 24 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, E, and F that can be used for the aspheric lens surfaces S5-S8 in Example 12.

[0212] Table 24

[0213]

[0214] Example 13

[0215] like Fig.13 As shown in FIG. 13 , it is a schematic diagram of the optical lens structure of Example 13. Fig.13 As shown, the optical lens includes, from the first side to the second side, a first lens L1, an aperture STO, a second lens L2, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0216] The first lens L1 has negative power, the first side surface S1 of the first lens is a plane, and the second side surface S2 of the first lens is a concave surface. The second lens L2 has positive power, the first side surface S3 of the second lens is a convex surface, and the second side surface S4 of the second lens is a concave surface. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is a convex surface. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is a convex surface, and the second side surface S8 of the fourth lens is a convex surface.

[0217] In this example, the total effective focal length F of the optical lens is 13.430 mm, the maximum field of view FOV of the optical lens is 33.159°, and the total optical length TTL of the optical lens is 50.171 mm. Table 25 shows the basic structural parameter table of the optical lens of Example 13, where the units of the radius of curvature Radius and the thickness / distance are both millimeters (mm).

[0218] Table 25

[0219]

[0220] Table 26 below shows the cone coefficient k and the higher-order coefficients A, B, C, and D that can be used for the aspheric lens surfaces S5-S8 in Example 13.

[0221] Table 26

[0222]

[0223] Example 14

[0224] like Fig.14 As shown in FIG. 14 , it is a schematic diagram of the optical lens structure of Example 14. Fig.14 As shown, the optical lens includes, from the first side to the second side, a first lens L1, an aperture STO, a second lens L2, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0225] The first lens L1 has negative power, the first side surface S1 of the first lens is a plane, and the second side surface S2 of the first lens is a concave surface. The second lens L2 has positive power, the first side surface S3 of the second lens is a convex surface, and the second side surface S4 of the second lens is a concave surface. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is a convex surface. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is a convex surface, and the second side surface S8 of the fourth lens is a convex surface.

[0226] In this example, the total effective focal length F of the optical lens is 13.437 mm, the maximum field of view FOV of the optical lens is 33.137°, and the total optical length TTL of the optical lens is 50.162 mm.

[0227] Table 27 shows the basic structural parameter table of the optical lens of Example 14, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0228] Table 27

[0229]

[0230] Table 28 below shows the cone coefficient k and the higher-order coefficients A, B, C, and D that can be used for the aspheric lens surfaces S5-S8 in Example 14.

[0231] Table 28

[0232]

[0233] Example 15

[0234] like Fig.15 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 15. Fig.15 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0235] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has negative power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0236] In this example, the total effective focal length F of the optical lens is 13.345 mm, the maximum field of view FOV of the optical lens is 32.305°, and the total optical length TTL of the optical lens is 48.080 mm.

[0237] Table 29 shows the basic structural parameter table of the optical lens of Example 15, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0238] Table 29

[0239]

[0240] Table 30 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, E, F, and G that can be used for the aspheric lens surfaces S5-S8 in Example 15.

[0241] Table 30

[0242]

[0243] Example 16

[0244] like Fig.16 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 16. Fig.16 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0245] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has negative power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0246] In this example, the total effective focal length F of the optical lens is 13.359 mm, the maximum field of view FOV of the optical lens is 32.291°, and the total optical length TTL of the optical lens is 48.555 mm. Table 31 shows the basic structural parameter table of the optical lens of Example 16, where the units of the radius of curvature Radius and the thickness / distance are both millimeters (mm).

[0247] Table 31

[0248]

[0249] Table 32 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, E, F, and G that can be used for the aspheric lens surfaces S5-S8 in Example 16.

[0250] Table 32

[0251]

[0252] Example 17

[0253] like Fig.17 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 17. Fig.17As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0254] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has negative power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0255] In this example, the total effective focal length F of the optical lens is 13.511 mm, the maximum field of view FOV of the optical lens is 32.139°, and the total optical length TTL of the optical lens is 44.935 mm. Table 33 shows the basic structural parameter table of the optical lens of Example 17, where the units of the radius of curvature Radius and the thickness / distance are both millimeters (mm).

[0256] Table 33

[0257]

[0258] Table 34 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, E, F, and G that can be used for the aspheric lens surfaces S5-S8 in Example 17.

[0259] Table 34

[0260]

[0261] Fig.30 The MTF curve of the optical lens of this example is shown. It can be seen from the figure that the MTF curve is relatively flat, the imaging consistency from the central field of view to the edge field of view is good, and the curves at different spatial frequencies are higher, and the performance is better. Of course, the architectures in other examples of this application can also achieve similar performance.

[0262] Example 18

[0263] like Fig.18 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 18. Fig.18 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0264] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has negative power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0265] In this example, the total effective focal length F of the optical lens is 13.536 mm, the maximum field of view FOV of the optical lens is 32.088°, and the total optical length TTL of the optical lens is 44.946 mm. Table 35 shows the basic structural parameter table of the optical lens of Example 18, where the units of the radius of curvature Radius and the thickness / distance are both millimeters (mm).

[0266] Table 35

[0267]

[0268] Table 36 below shows the cone coefficient k and the higher-order coefficients A, B, C, and D that can be used for the aspheric lens surfaces S5-S8 in Example 18.

[0269] Table 36

[0270]

[0271] Example 19

[0272] like Fig.19 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 19. Fig.19 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0273] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has negative power, the first side surface S3 of the second lens is a plane, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0274] In this example, the total effective focal length F of the optical lens is 13.994 mm, the maximum field of view FOV of the optical lens is 31.043°, and the total optical length TTL of the optical lens is 50.033 mm.

[0275] Table 37 shows the basic structural parameter table of the optical lens of Example 19, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0276] Table 37

[0277]

[0278] Table 38 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, and E that can be used for the aspheric lens surfaces S5 and S6 in Example 19.

[0279] Table 38

[0280]

[0281] Example 20

[0282] like Fig. 20 As shown in FIG. 2 , it is a schematic diagram of the optical lens structure of Example 20. Fig. 20 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0283] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has negative power, the first side surface S3 of the second lens is a plane, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is a plane, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0284] In this example, the total effective focal length F of the optical lens is 14.040 mm, the maximum field of view FOV of the optical lens is 30.949°, and the total optical length TTL of the optical lens is 49.958 mm.

[0285] Table 39 shows the basic structural parameter table of the optical lens of Example 20, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0286] Table 39

[0287]

[0288] Table 40 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, and E that can be used for the aspheric lens surfaces S5 and S6 in Example 20.

[0289] Table 40

[0290]

[0291] Example 21

[0292] like Fig.21 As shown in FIG. 21 , it is a schematic diagram of the optical lens structure of Example 21. Fig.21 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0293] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is a plane. The second lens L2 has negative power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is convex, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is concave, and the second side surface S8 of the fourth lens is convex.

[0294] In this example, the total effective focal length F of the optical lens is 13.789 mm, the maximum field of view FOV of the optical lens is 32.654°, and the total optical length TTL of the optical lens is 49.968 mm.

[0295] Table 41 shows the basic structural parameter table of the optical lens of Example 21, in which the units of curvature radius Radius and thickness / distance are both millimeters (mm).

[0296] Table 41

[0297]

[0298] Table 42 below shows the cone coefficient k and the higher-order coefficients A, B, and C that can be used for the aspheric lens surfaces S5-S8 in Example Twenty-One.

[0299] Table 42

[0300]

[0301] Example 22

[0302] like Fig. 22 As shown in FIG. 22, it is a schematic diagram of the optical lens structure of Example 22. Fig. 22 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0303] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is a plane. The second lens L2 has negative power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is convex, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is concave, and the second side surface S8 of the fourth lens is convex.

[0304] In this example, the total effective focal length F of the optical lens is 13.826 mm, the maximum field of view FOV of the optical lens is 32.627°, and the total optical length TTL of the optical lens is 50.039 mm.

[0305] Table 43 shows the basic structural parameter table of the optical lens of Example 22, in which the units of curvature radius Radius and thickness / distance are both millimeters (mm).

[0306] Table 43

[0307]

[0308] Table 44 below shows the cone coefficient k and the higher-order coefficients A, B, and C that can be used for the aspheric lens surfaces S5-S8 in Example Twenty-Two.

[0309] Table 44

[0310]

[0311] Example 23

[0312] like Fig.23 As shown in FIG. 23 , it is a schematic diagram of the optical lens structure of Example 23. Fig.23 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0313] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is a plane. The second lens L2 has negative power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0314] In this example, the total effective focal length F of the optical lens is 13.956 mm, the maximum field of view FOV of the optical lens is 32.629°, and the total optical length TTL of the optical lens is 50.004 mm.

[0315] Table 45 shows the basic structural parameter table of the optical lens of Example 23, in which the units of curvature radius Radius and thickness / distance are both millimeters (mm).

[0316] Table 45

[0317]

[0318] Table 46 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, and E that can be used for the aspheric lens surfaces S5-S8 in Example Twenty-Three.

[0319] Table 46

[0320]

[0321] Example 24

[0322] like Fig.24 As shown in FIG. 24 , it is a schematic diagram of the optical lens structure of Example 24. Fig.24 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0323] The first lens L1 has negative power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is a plane. The second lens L2 has negative power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0324] In this example, the total effective focal length F of the optical lens is 13.943 mm, the maximum field of view FOV of the optical lens is 32.655°, and the total optical length TTL of the optical lens is 49.978 mm.

[0325] Table 47 shows the basic structural parameter table of the optical lens of Example 24, in which the units of curvature radius Radius and thickness / distance are both millimeters (mm).

[0326] Table 47

[0327]

[0328] Table 48 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, and E that can be used for the aspheric lens surfaces S5-S8 in Example 24.

[0329] Table 48

[0330]

[0331] Example 25

[0332] like Fig.25 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 25. Fig.25 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0333] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has negative power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0334] In this example, the total effective focal length F of the optical lens is 15.121 mm, the maximum field of view FOV of the optical lens is 28.296°, and the total optical length TTL of the optical lens is 50.658 mm. Table 49 shows the basic structural parameter table of the optical lens of Example 25, where the units of the radius of curvature Radius and the thickness / distance are both millimeters (mm).

[0335] Table 49

[0336]

[0337] The following Table 50 shows the cone coefficient k and the higher-order coefficients A, B, and C that can be used for the aspherical lens surface S6 in Example 25.

[0338] Table 50

[0339]

[0340] Example 26

[0341] like Fig.26 As shown in FIG. 26 , it is a schematic diagram of the optical lens structure of Example 26. Fig.26 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0342] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has negative power, the first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0343] In this example, the total effective focal length F of the optical lens is 15.157 mm, the maximum field of view FOV of the optical lens is 28.282°, and the total optical length TTL of the optical lens is 50.583 mm.

[0344] Table 51 shows the basic structural parameter table of the optical lens of Example 26, in which the units of curvature radius Radius and thickness / distance are both millimeters (mm).

[0345] Table 51

[0346]

[0347] The following Table 52 shows the cone coefficient k and the coefficients A of the higher-order terms that can be used for the aspherical lens surface S6 in Example Twenty-Six.

[0348] Table 52

[0349]

[0350] Example 27

[0351] like Fig. 27 As shown in FIG. 27 , it is a schematic diagram of the optical lens structure of Example 27. Fig. 27As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0352] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has negative power, the first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0353] In this example, the total effective focal length F of the optical lens is 13.725 mm, the maximum field of view FOV of the optical lens is 31.769°, and the total optical length TTL of the optical lens is 50.017 mm. Table 53 shows the basic structural parameter table of the optical lens of Example 27, where the units of the radius of curvature Radius and the thickness / distance are both millimeters (mm).

[0354] Table 53

[0355]

[0356] Table 54 below shows the cone coefficient k and the higher-order coefficients A, B, C, D, and E that can be used for the aspheric lens surface S6 in Example Twenty-Nine.

[0357] Table 54

[0358]

[0359] Example 28

[0360] like Fig.28 As shown in FIG. 1 , it is a schematic diagram of the optical lens structure of Example 28. Fig.28 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4 and an imaging surface IMA.

[0361] The first lens L1 has negative power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has negative power, the first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex.

[0362] In this example, the total effective focal length F of the optical lens is 13.737 mm, the maximum field of view FOV of the optical lens is 31.712°, and the total optical length TTL of the optical lens is 50.015 mm. Table 55 shows the basic structural parameter table of the optical lens of Example 28, where the units of the radius of curvature Radius and the thickness / distance are both millimeters (mm).

[0363] Table 55

[0364]

[0365] The following Table 56 shows the cone coefficient k and the higher-order coefficients A, B, C, D, and E that can be used for the aspherical lens surface S6 in Example Twenty-Eight.

[0366] Table 56

[0367]

[0368] In summary, Examples 1 to 28 satisfy the relationships shown in Table 57, Table 58, and Table 59, respectively.

[0369] Table 57

[0370]

[0371] Table 58

[0372]

[0373] Table 59

[0374]

[0375] Tables 60, 61, and 62 give the effective focal length F of the optical lenses of Examples 1 to 28, the effective focal length F1 to F4 of each lens, etc. (unit: millimeter).

[0376] Table 60

[0377]

[0378] Table 61

[0379]

[0380] Table 62

[0381]

[0382] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0383] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0384] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0385] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical lens, characterized in that: From the first side to the second side, it includes: a first lens having negative optical power; a second lens having positive or negative optical power, wherein the second side surface of the second lens is a concave surface; a third lens having positive optical power, wherein the second side surface of the third lens is a convex surface; a fourth lens having positive optical power, wherein at least one of the first side surface and the second side surface of the fourth lens is a convex surface; The on-axis spacing d7 between the third lens and the fourth lens and the total optical length of the optical lens, that is, the center distance TTL from the first side center of the first lens of the optical lens to the imaging surface satisfies: 0.07≤d7 / TTL≤0.3; the on-axis spacing d2 between the first lens and the second lens and TTL satisfies: d2 / TTL≤0.05; the optical back focus of the optical lens, that is, the center distance BFL from the second side center of the fourth lens of the optical lens to the imaging surface and TTL satisfies: 0.55≥BFL / TTL≥0.

3.

2. The optical lens according to claim 1, characterized in that: The first side surface of the first lens is concave, and the second side surface is concave; or the first side surface of the first lens is convex, and the second side surface is concave; or the first side surface of the first lens is concave, and the second side surface is a plane; or the first side surface of the first lens is a plane, and the second side surface is concave; or the first side surface of the first lens is concave, and the second side surface is convex.

3. The optical lens according to claim 1, characterized in that: The second lens has positive optical power, and the first side surface of the second lens is a convex surface; or the second lens has negative optical power, and the first side surface of the second lens is a convex surface, a plane surface, or a concave surface.

4. The optical lens according to claim 1, characterized in that: The first side surface of the third lens is a convex surface, a flat surface, or a concave surface.

5. The optical lens according to claim 1, characterized in that: The first side surface of the fourth lens is convex, and the second side surface is convex; or the first side surface of the fourth lens is convex, and the second side surface is concave; or the first side surface of the fourth lens is concave, and the second side surface is convex.

6. The optical lens according to any one of claims 1 to 5, characterized in that: The focal length value F3 of the third lens and the focal length value F of the entire set of optical lenses satisfy the following: 0.6≤F3 / F≤1.

8.

7. The optical lens according to any one of claims 1 to 5, characterized in that: The center thickness d1 of the first lens, the axial spacing d2 between the first lens and the second lens, the center thickness d3 of the second lens and the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface satisfy the following relationship: 0.01≤(d1+d2+d3) / TTL≤0.

3.

8. The optical lens according to any one of claims 1 to 5, characterized in that: The central curvature radius R6 of the second side surface of the third lens and the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface, satisfy the following: 0≥R6 / TTL≥-0.

5.

9. The optical lens according to any one of claims 1 to 5, characterized in that: The maximum effective light aperture D of the first side surface of the first lens and the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface, satisfy the following: 0.4≥D / TTL≥0.

02.

10. The optical lens according to any one of claims 1 to 5, characterized in that: The central curvature radius R4 of the second side surface of the second lens satisfies the following relationship with the entire focal length F of the optical lens: 0.2≤R4 / F≤6.

5.

11. The optical lens according to any one of claims 1 to 5, characterized in that: The total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface and the entire focal length value F of the optical lens satisfy the following relationship: 2≤TTL / F≤5.

12. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies at least one of the following conditions: The maximum field of view FOV of the optical lens, the focal length value F of the entire group of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following: 70≥(FOV×F) / H≥45; The maximum effective light aperture D of the first side surface of the first lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following relationship: 0.005≤D / H / FOV≤0.

1.

13. The optical lens according to any one of claims 1 to 5, characterized in that: When the first side surface of the second lens is convex or concave, a central curvature radius R3 and a central curvature radius R4 of the second side surface of the second lens satisfy the following relationship: 0.55≤|R3 / R4|≤2.

5.

14. The optical lens according to any one of claims 1 to 5, characterized in that: The whole set focal length value F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy the following: 1≤F / H≤3.

15. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies at least one of the following conditions: The focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: F / ENPD≤3.0; The aperture diameter DST of the optical lens and the focal length value F of the entire optical lens group satisfy the following: 0.2≤DST / F≤0.8; A central curvature radius R7 of the first side surface of the fourth lens and a central curvature radius R8 of the second side surface of the fourth lens satisfy: 0.1≤|R7 / R8|≤5; The image height H corresponding to the maximum field angle of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: H / ENPD≤1.

7.

16. The optical lens according to any one of claims 1 to 5, characterized in that: The maximum effective light aperture D of the first side surface of the first lens, the image height H corresponding to the maximum field angle of the optical lens, and the entire focal length value F of the optical lens satisfy the following relationship: D / H / F≤0.

18.

17. The optical lens according to any one of claims 1 to 5, characterized in that: The optical back focus of the optical lens, that is, the distance BFL from the center of the second side of the fourth lens of the optical lens to the center of the imaging plane and the distance TL from the center of the first side of the first lens to the center of the second side of the fourth lens satisfy the following: 1≥BFL / TL≥0.

3.

18. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens satisfies at least one of the following conditions: The axial interval d7 between the third lens and the fourth lens and the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface, satisfy the following: 0.072≤d7 / TTL≤0.25; The on-axis interval d2 between the first lens and the second lens satisfies TTL: d2 / TTL≤0.042; The optical back focus of the optical lens, that is, the distance BFL from the center of the second side of the fourth lens of the optical lens to the center of the imaging surface and TTL satisfy the following: 0.5≥BFL / TTL≥0.32; The focal length value F3 of the third lens and the focal length value F of the entire optical lens group satisfy: 0.8≤F3 / F≤1.65; The center thickness d1 of the first lens, the axial interval d2 between the first lens and the second lens, the center thickness d3 of the second lens and the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens of the optical lens to the imaging surface satisfy the following: 0.02≤(d1+d2+d3) / TTL≤0.285; The central curvature radius R6 of the second side surface of the third lens and the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface, satisfy the following conditions: 0≥R6 / TTL≥-0.3; The maximum effective aperture D of the first side surface of the first lens and the total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface, satisfy the following: 0.3≥D / TTL≥0.05; The central curvature radius R4 of the second side surface of the second lens satisfies the following relationship with the focal length F of the entire optical lens set: 0.25≤R4 / F≤6; The total optical length of the optical lens, that is, the distance TTL from the center of the first side of the first lens of the optical lens to the center of the imaging surface and the whole group focal length value F of the optical lens satisfy the following: 3≤TTL / F≤4; The maximum field of view FOV of the optical lens, the focal length value F of the entire group of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following: 65≥(FOV×F) / H≥50; The maximum effective aperture D of the first side surface of the first lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy the following: 0.01≤D / H / FOV≤0.08; A central curvature radius R3 of the first side surface of the second lens and a central curvature radius R4 of the second side surface of the second lens satisfy: 0.60≤|R3 / R4|≤2; The focal length value F of the entire set of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy the following: 1.5≤F / H≤2.3; The whole set focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F / ENPD≤2.6; The aperture diameter DST of the optical lens and the focal length value F of the entire optical lens group satisfy the following: 0.3≤DST / F≤0.55; A central curvature radius R7 of the first side surface of the fourth lens and a central curvature radius R8 of the second side surface of the fourth lens satisfy: 0.2≤|R7 / R8|≤4.5; The image height H corresponding to the maximum field angle of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: H / ENPD≤1.53; The maximum effective aperture D of the first side surface of the first lens, the image height H corresponding to the maximum field angle of the optical lens, and the entire focal length value F of the optical lens satisfy the following: 0.02≤D / H / F≤0.12; The optical back focus of the optical lens, that is, the distance BFL from the center of the second side of the fourth lens of the optical lens to the center of the imaging plane and the distance TL from the center of the first side of the first lens to the center of the second side of the fourth lens satisfy the following: 0.9≥BFL / TL≥0.

4.

19. An electronic device, characterized in that: The invention comprises the optical lens according to any one of claims 1 to 18 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

Images