Optical Lens and Electronic Device

Abstract

The present application discloses an optical lens and an electronic device including the optical lens. The optical lens sequentially includes, along the optical axis from a first side to a second side: a first lens having a positive optical power, the second side surface of which is convex; a second lens having a positive optical power, the first side surface of which is convex and the second side surface of which is concave; a third lens having a positive optical power, the first side surface of which is concave and the second side surface of which is convex; and a fourth lens having a positive optical power, the first side surface of which is convex.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more particularly, to an optical lens and an electronic device. Background Art

[0002] With the improvement of the imaging quality of optical lenses, optical lenses have been widely used in various fields. For example, optical lenses play an irreplaceable role in various fields such as intelligent detection, security monitoring, smart phones, and automotive assisted driving. At the same time, lens manufacturers in major fields have begun to spare no expense in investing a large amount of time and effort in the research and development of lens performance.

[0003] In recent years, with the rapid development of automotive assisted driving systems, optical lenses have been increasingly widely used in automobiles, and users' requirements for lens miniaturization have become more prominent. At present, in order to improve the imaging quality of lenses in the market, the method of increasing the number of lens elements is mostly adopted. However, the lens structure with a large number of elements will increase the volume and weight of the lens. In addition, the lens structure with a large number of elements will also bring the problem of increased cost, and at the same time, it will seriously affect the miniaturization of the lens.

[0004] In addition, for safety reasons, for lenses used in some harsh environments, how to enable the lens to still maintain good imaging performance when used in an environment with a large temperature difference; for lenses used in some fields with limited installation space, how to make the lens easy to be reasonably matched with other components has become the research and development direction of lens manufacturers in major fields at present. Summary of the Invention

[0005] The present application provides an optical lens, which sequentially includes, along the optical axis from the first side to the second side: a first lens with positive optical power, whose second side is convex; a second lens with positive optical power, whose first side is convex and second side is concave; a third lens with positive optical power, whose first side is concave and second side is convex; and a fourth lens with positive optical power, whose first side is convex.

[0006] In one embodiment, the first side of the first lens is convex.

[0007] In one embodiment, the first side of the first lens is concave.

[0008] In one embodiment, the second side of the fourth lens is concave.

[0009] In one embodiment, the second side of the fourth lens is convex.

[0010] In one embodiment, the total effective focal length F of the optical lens and the entrance pupil diameter EPND of the optical lens may satisfy: F / EPND ≤ 1.5.

[0011] In one embodiment, the total length TTL of the optical lens and the total effective focal length F of the optical lens may satisfy: TTL / F ≤ 4.5.

[0012] In one embodiment, the total length TTL of the optical lens, the maximum field of view FOV of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens may satisfy: TTL / H / FOV ≤ 0.3.

[0013] In one embodiment, the back focal length BFL of the optical lens and the distance TL on the optical axis from the center of the first side of the first lens to the center of the second side of the fourth lens may satisfy: BFL / TL ≥ 0.15.

[0014] In one embodiment, the maximum field of view FOV of the optical lens, the maximum clear aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens may satisfy: D / H / FOV ≤ 0.1.

[0015] In one embodiment, the maximum field of view FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens may satisfy: (FOV × F) / H ≤ 70.

[0016] In one embodiment, the back focal length BFL of the optical lens and the total length TTL of the optical lens may satisfy: BFL / TTL ≥ 0.1.

[0017] In one embodiment, the sagittal height sag4 at the maximum clear aperture of the first side of the second lens corresponding to the maximum field of view of the optical lens and the sagittal height sag5 at the maximum clear aperture of the second side of the second lens corresponding to the maximum field of view of the optical lens may satisfy: 0.5 ≤ sag4 / sag5 ≤ 2.5.

[0018] In one embodiment, the sagittal height sag6 at the maximum clear aperture of the first side of the third lens corresponding to the maximum field of view of the optical lens and the sagittal height sag7 at the maximum clear aperture of the second side of the third lens corresponding to the maximum field of view of the optical lens may satisfy: 0.2 ≤ sag6 / sag7 ≤ 2.2.

[0019] In one embodiment, the optical lens further includes a diaphragm disposed between the first side and the first lens. Wherein, the distance L on the optical axis from the center of the diaphragm to the second side of the optical lens, the maximum field of view angle FOV of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the total length TTL of the optical lens satisfy: FOV×H / L / TTL≤0.7.

[0020] In one embodiment, the maximum field of view angle FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view angle of the optical lens satisfy: 0.5≤|F×tan(FOV / 2) / (H / 2)|≤2.

[0021] In one embodiment, the image height H corresponding to the maximum field of view angle of the optical lens and the total length TTL of the optical lens satisfy: TTL / H≤7.

[0022] In one embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: F1 / F≥1.5.

[0023] In one embodiment, the effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy: F2 / F≥1.8.

[0024] In one embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: F3 / F≥1.8.

[0025] In one embodiment, the effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy: F4 / F≤1.95.

[0026] In one embodiment, the maximum aperture diameter D of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the total effective focal length F of the optical lens satisfy: D / H / F≤0.3.

[0027] In one embodiment, the effective focal length F3 of the third lens and the effective focal length F4 of the fourth lens satisfy: F3 / F4≥2.

[0028] In one embodiment, the optical lens further includes a diaphragm disposed between the first side and the first lens. Wherein, the distance d0 on the optical axis from the center of the diaphragm to the center of the first side of the first lens and the total length TTL of the optical lens satisfy: 0≤d0 / TTL≤0.3.

[0029] In one embodiment, the combined focal length F23 of the second lens and the third lens and the total effective focal length F of the optical lens satisfy: F23 / F≥1.8.

[0030] In one embodiment, the optical lens further includes a diaphragm disposed between the first side and the first lens. Wherein, the back focal length BFL of the optical lens and the distance SL on the optical axis from the center of the diaphragm to the center of the second side of the fourth lens satisfy: BFL / SL≥0.15.

[0031] In one embodiment, the maximum field of view FOV of the optical lens, the maximum clear aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: D / H / tan(FOV)≤5.5.

[0032] On the other hand, the present application provides an optical lens. The optical lens sequentially includes, along the optical axis, from the first side to the second side: a first lens with a positive optical power; a second lens with a positive optical power; a third lens with a positive optical power; and a fourth lens with a positive optical power. The total effective focal length F of the optical lens and the entrance pupil diameter EPND of the optical lens satisfy: F / EPND≤1.5.

[0033] In one embodiment, the first side of the first lens is convex, and the second side is convex.

[0034] In one embodiment, the first side of the first lens is concave, and the second side is convex.

[0035] In one embodiment, the first side of the second lens is convex, and the second side is concave.

[0036] In one embodiment, the first side of the third lens is concave, and the second side is convex.

[0037] In one embodiment, the first side of the fourth lens is convex, and the second side is concave.

[0038] In one embodiment, the first side of the fourth lens is convex, and the second side is convex.

[0039] In one embodiment, the total length TTL of the optical lens and the total effective focal length F of the optical lens satisfy: TTL / F≤4.5.

[0040] In one embodiment, the total length TTL of the optical lens, the maximum field of view FOV of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: TTL / H / FOV≤0.3.

[0041] In one embodiment, the back focal length BFL of the optical lens and the distance TL on the optical axis from the center of the first side of the first lens to the center of the second side of the fourth lens satisfy: BFL / TL≥0.15.

[0042] In one embodiment, the maximum field of view angle FOV of the optical lens, the maximum clear aperture D of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, and the image height H corresponding to the maximum field of view angle of the optical lens may satisfy: D / H / FOV ≤ 0.1.

[0043] In one embodiment, the maximum field of view angle FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view angle of the optical lens may satisfy: (FOV × F) / H ≤ 70.

[0044] In one embodiment, the back focal length BFL of the optical lens and the total length TTL of the optical lens may satisfy: BFL / TTL ≥ 0.1.

[0045] In one embodiment, the sagittal height sag4 at the maximum clear aperture of the first side of the second lens corresponding to the maximum field of view angle of the optical lens and the sagittal height sag5 at the maximum clear aperture of the second side of the second lens corresponding to the maximum field of view angle of the optical lens may satisfy: 0.5 ≤ sag4 / sag5 ≤ 2.5.

[0046] In one embodiment, the sagittal height sag6 at the maximum clear aperture of the first side of the third lens corresponding to the maximum field of view angle of the optical lens and the sagittal height sag7 at the maximum clear aperture of the second side of the third lens corresponding to the maximum field of view angle of the optical lens may satisfy: 0.2 ≤ sag6 / sag7 ≤ 2.2.

[0047] In one embodiment, the optical lens further includes a diaphragm disposed between the first side and the first lens. Wherein, the distance L from the center of the diaphragm to the second side of the optical lens on the optical axis, the maximum field of view angle FOV of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the total length TTL of the optical lens may satisfy: FOV × H / L / TTL ≤ 0.7.

[0048] In one embodiment, the maximum field of view angle FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view angle of the optical lens may satisfy: 0.5 ≤ |F × tan(FOV / 2) / (H / 2)| ≤ 2.

[0049] In one embodiment, the image height H corresponding to the maximum field of view angle of the optical lens and the total length TTL of the optical lens may satisfy: TTL / H ≤ 7.

[0050] In one embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens may satisfy: F1 / F ≥ 1.5.

[0051] In one embodiment, the effective focal length F2 of the second lens and the total effective focal length F of the optical lens may satisfy: F2 / F ≥ 1.8.

[0052] In one embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens may satisfy: F3 / F ≥ 1.8.

[0053] In one embodiment, the effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens may satisfy: F4 / F ≤ 1.95.

[0054] In one embodiment, the maximum clear aperture D of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the total effective focal length F of the optical lens may satisfy: D / H / F ≤ 0.3.

[0055] In one embodiment, the effective focal length F3 of the third lens and the effective focal length F4 of the fourth lens may satisfy: F3 / F4 ≥ 2.

[0056] In one embodiment, the optical lens further includes a diaphragm disposed between the first side and the first lens. Wherein, the distance d0 on the optical axis from the center of the diaphragm to the center of the first side of the first lens and the total length TTL of the optical lens may satisfy: 0 ≤ d0 / TTL ≤ 0.3.

[0057] In one embodiment, the combined focal length F23 of the second lens and the third lens and the total effective focal length F of the optical lens may satisfy: F23 / F ≥ 1.8.

[0058] In one embodiment, the optical lens further includes a diaphragm disposed between the first side and the first lens. Wherein, the back focal length BFL of the optical lens and the distance SL on the optical axis from the center of the diaphragm to the center of the second side of the fourth lens may satisfy: BFL / SL ≥ 0.15.

[0059] In one embodiment, the maximum field of view angle FOV of the optical lens, the maximum clear aperture D of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, and the image height H corresponding to the maximum field of view angle of the optical lens may satisfy: D / H / tan(FOV) ≤ 5.5.

[0060] On the other hand, the present application provides an electronic device. The electronic device includes an optical lens provided according to the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0061] The present application uses four lenses. By optimizing the shapes, optical powers, etc. of the respective lenses, the optical lens has at least one beneficial effect such as miniaturization, high resolution, small CRA, small FNO, long back focal length, large aperture, low cost, and high imaging quality. Description of the Drawings

[0062] In conjunction with the accompanying drawings, through the detailed description of the following embodiments, other features, objectives, and advantages of the present utility application will become more apparent. In the drawings:

[0063] Figure 1 FIG. [0000130] is a schematic structural diagram of an optical lens according to Embodiment 1 of the present application;

[0064] Figure 2 FIG. [0000131] is a schematic structural diagram of an optical lens according to Embodiment 2 of the present application;

[0065] Figure 3 FIG. [0000132] is a schematic structural diagram of an optical lens according to Embodiment 3 of the present application;

[0066] Figure 4 FIG. [0000133] is a schematic structural diagram of an optical lens according to Embodiment 4 of the present application;

[0067] Figure 5 FIG. [0000134] is a schematic structural diagram of an optical lens according to Embodiment 5 of the present application;

[0068] Figure 6 FIG. [0000135] is a schematic structural diagram of an optical lens according to Embodiment 6 of the present application;

[0069] Figure 7 FIG. [0000136] is a schematic structural diagram of an optical lens according to Embodiment 7 of the present application; and

[0070] Figure 8 FIG. [0000137] is a schematic structural diagram of an optical lens according to Embodiment 8 of the present application. Detailed Embodiments

[0071] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0072] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0073] In the drawings, for the sake of clarity, the thickness, dimensions, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are presented by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only for illustration and are not drawn to an exact scale.

[0074] In this text, 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 closest to the first side is called the first side surface of the lens, and the surface of each lens closest to the second side is called the second side surface of the lens. The surface of the optical lens closest to the second side is called the second side surface of the optical lens. Exemplarily, the first side can be the object side and the second side can be the image side; alternatively, the first side can be the imaging side and the second side can be the image source side.

[0075] It should also be understood that the terms "comprise", "comprising", "have", "include" and / or "including", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after the list of listed features, it modifies the entire list of listed features, rather than modifying the individual elements in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0076] Unless otherwise defined, all terms (including technical and scientific terms) used in this text have the same meaning as the ordinary understanding of those of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formalized sense unless expressly so defined herein.

[0077] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0078] The features, principles and other aspects of the present application will be described in detail below.

[0079] In an exemplary embodiment, the optical lens includes, for example, four lenses having optical power, namely, a first lens, a second lens, a third lens and a fourth lens. These four lenses are arranged in sequence along the optical axis from the first side to the second side.

[0080] In an exemplary embodiment, the optical lens provided by the present application can be used as, for example, a vehicle-mounted lens. At this time, the first side of the optical lens can be the object side and the second side can be the image side. The light rays from the object side can be imaged on the image side. The second side surface of the optical lens is the imaging surface of the optical lens.

[0081] In an exemplary embodiment, the optical lens provided by the present application can be used as, for example, a projection lens or a lidar transmitter lens. At this time, the second side of the optical lens can be the image source side, and the first side can be the imaging side. The light from the image source side can be imaged on the imaging side. The second side surface of the optical lens is the image source surface of the optical lens.

[0082] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the second side surface. Optionally, the photosensitive element disposed on the second side surface can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS).

[0083] In an exemplary embodiment, the first lens may have a positive optical power. The first lens may have a convex-convex surface type or a convex-concave surface type. Such a setting of the optical power and surface type of the first lens is beneficial for the first lens to collect more light and enter the rear optical system, which is beneficial for increasing the light flux of the optical lens. Preferably, the first lens may have a relatively large focal length, which is beneficial for the light to transition smoothly to the rear of the lens, and is beneficial for improving the resolution quality while achieving a small FNO.

[0084] In an exemplary embodiment, the second lens may have a positive optical power. The second lens may have a convex-concave surface type. Such a setting of the optical power and surface type of the second lens is beneficial for the second lens to have a relatively large focal length, which is beneficial for collecting light, making the light trend transition smoothly, and at the same time beneficial for allowing as much large-angle light as possible to enter the second lens to enhance the illuminance.

[0085] In an exemplary embodiment, the third lens may have a positive optical power. The third lens may have a concave-convex surface type. Such a setting of the optical power and surface type of the third lens is beneficial for the third lens to have a relatively large focal length, which is beneficial for further adjusting the incident light angle, smoothly transitioning the peripheral light, and is beneficial for reducing the sensitivity of the third lens and improving the imaging quality.

[0086] In an exemplary embodiment, the fourth lens may have a positive optical power. The fourth lens may have a convex-concave surface type or a convex-convex surface type. Such a setting of the optical power and surface type of the fourth lens is beneficial for the fourth lens to have a relatively small focal length, which is beneficial for converging the light incident on the fourth lens, can effectively reduce the CRA of the lens, etc., making the lens more suitable for use in low-light environments, and at the same time beneficial for improving the resolution ability of the lens.

[0087] In an exemplary embodiment, a diaphragm for restricting the light beam may be disposed between the first side and the first lens to further improve the imaging quality of the optical lens. Disposing the diaphragm between the first side and the first lens is conducive to effectively converging the light rays entering the optical lens, reducing the lens aperture; facilitating the subsequent addition of light path folding components in the optical path; and facilitating the cooperation of the optical lens provided in the present application with other lens groups. In the embodiment of the present application, the diaphragm may be disposed near the first side surface of the first lens. However, it should be noted that the position of the diaphragm disclosed here is only an example and not a limitation; in an alternative embodiment, the diaphragm may also be disposed at other positions according to actual needs.

[0088] In an exemplary embodiment, the total length TTL of the optical lens involved in the present application. Specifically, when a diaphragm is provided in the optical lens, if the diaphragm is located between the first side and the first lens, TTL is the distance from the center of the diaphragm to the second side surface of the optical lens on the optical axis, otherwise TTL is the distance from the center of the first side surface of the first lens to the second side surface of the optical lens on the optical axis. The back focal length BFL of the optical lens involved in the present application may be the distance from the center of the second side surface of the fourth lens to the second side surface of the optical lens on the optical axis.

[0089] In an exemplary embodiment, the optical lens according to the present application may satisfy: F / EPND ≤ 1.5, where F is the total effective focal length of the optical lens and EPND is the entrance pupil diameter of the optical lens. More specifically, F and EPND may further satisfy: F / EPND ≤ 1.3. Satisfying F / EPND ≤ 1.5 is conducive to making the lens have a smaller aperture value FNO to increase the light input.

[0090] In an exemplary embodiment, the optical lens according to the present application may satisfy: TTL / F ≤ 4.5, where TTL is the total length of the optical lens and F is the total effective focal length of the optical lens. More specifically, TTL and F may further satisfy: TTL / F ≤ 3. Satisfying TTL / F ≤ 4.5 can effectively limit the total length of the lens and achieve lens miniaturization.

[0091] In an exemplary embodiment, the optical lens according to the present application may satisfy: TTL / H / FOV ≤ 0.3, where TTL is the total length of the optical lens, FOV is the maximum field of view angle of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens. More specifically, TTL, H, and FOV may further satisfy: TTL / H / FOV ≤ 0.2. Satisfying TTL / H / FOV ≤ 0.3 is conducive to effectively limiting the length of the lens while the imaging surface and image height of the lens remain unchanged, and is conducive to achieving lens miniaturization.

[0092] In an exemplary embodiment, the optical lens according to the present application may satisfy: BFL / TL≥0.15, where BFL is the back focal length of the optical lens, and TL is the distance on the optical axis from the center of the first side of the first lens to the center of the second side of the fourth lens. More specifically, BFL and TL may further satisfy: BFL / TL≥0.18. Satisfying BFL / TL≥0.15 is beneficial to having a longer back focal length BFL of the lens on the basis of achieving miniaturization, which is beneficial to the assembly of the lens.

[0093] In an exemplary embodiment, the optical lens according to the present application may satisfy: D / H / FOV≤0.1, where FOV is the maximum field of view angle of the optical lens, D is the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens. More specifically, D, H, and FOV may further satisfy: D / H / FOV≤0.085. Satisfying D / H / FOV≤0.1 is beneficial to reducing the front aperture diameter and is beneficial to achieving miniaturization.

[0094] In an exemplary embodiment, the optical lens according to the present application may satisfy: (FOV×F) / H≤70, where FOV is the maximum field of view angle of the optical lens, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens. More specifically, FOV, F, and H may further satisfy: (FOV×F) / H≤65. Satisfying (FOV×F) / H≤70 is beneficial to achieving characteristics such as short focal length, small field of view angle, and small distortion.

[0095] In an exemplary embodiment, the optical lens according to the present application may satisfy: BFL / TTL≥0.1, where BFL is the back focal length of the optical lens, and TTL is the total length of the optical lens. More specifically, BFL and TTL may further satisfy: BFL / TTL≥0.15. Satisfying BFL / TTL≥0.1 is beneficial to having a longer back focal length BFL of the lens on the basis of achieving miniaturization, which is beneficial to the assembly of the lens.

[0096] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.5≤sag4 / sag5≤2.5, where sag4 is the sagitta at the maximum clear aperture of the first side of the second lens corresponding to the maximum field of view angle of the optical lens, and sag5 is the sagitta at the maximum clear aperture of the second side of the second lens corresponding to the maximum field of view angle of the optical lens. More specifically, sag4 and sag5 may further satisfy: 0.7≤sag4 / sag5≤2.2. Satisfying 0.5≤sag4 / sag5≤2.5 is beneficial to the smooth transition of light.

[0097] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.2 ≤ sag6 / sag7 ≤ 2.2, where sag6 is the sagitta at the maximum clear aperture of the first side of the third lens corresponding to the maximum field of view angle of the optical lens, and sag7 is the sagitta at the maximum clear aperture of the second side of the third lens corresponding to the maximum field of view angle of the optical lens. More specifically, sag6 and sag7 can further satisfy: 0.65 ≤ sag6 / sag7 ≤ 2. Satisfying 0.2 ≤ sag6 / sag7 ≤ 2.2 is beneficial for the smooth transition of light.

[0098] In an exemplary embodiment, the optical lens according to the present application can satisfy: FOV × H / L / TTL ≤ 0.7, where L is the distance from the aperture stop to the second side of the optical lens on the optical axis, FOV is the maximum field of view angle of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, and TTL is the total length of the optical lens. More specifically, FOV, H, L, and TTL can further satisfy: FOV × H / L / TTL ≤ 0.4. Satisfying FOV × H / L / TTL ≤ 0.7 is beneficial for the lens to have a smaller CRA while ensuring a certain field of view angle and imaging surface of the lens.

[0099] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.5 ≤ |F × tan(FOV / 2) / (H / 2)| ≤ 2, where FOV is the maximum field of view angle of the optical lens, F is the total effective focal length of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens. More specifically, F, FOV, and H can further satisfy: 0.8 ≤ |F × tan(FOV / 2) / (H / 2)| ≤ 1.5. Satisfying 0.5 ≤ |F × tan(FOV / 2) / (H / 2)| ≤ 2 is beneficial for achieving the characteristic of small distortion.

[0100] In an exemplary embodiment, the optical lens according to the present application can satisfy: TTL / H ≤ 7, where H is the image height corresponding to the maximum field of view angle of the optical lens, and TTL is the total length of the optical lens. More specifically, TTL and H can further satisfy: TTL / H ≤ 5. Satisfying TTL / H ≤ 7 can effectively limit the length of the lens and achieve miniaturization of the lens.

[0101] In an exemplary embodiment, the optical lens according to the present application can satisfy: F1 / F ≥ 1.5, where F1 is the effective focal length of the first lens, and F is the total effective focal length of the optical lens. More specifically, F1 and F can further satisfy: F1 / F ≥ 1.8. Satisfying F1 / F ≥ 1.5 is beneficial for the first lens to have a longer focal length, which helps the smooth transition of light and reduces the sensitivity of the first lens.

[0102] In an exemplary embodiment, the optical lens according to the present application can satisfy: F2 / F≥1.8, where F2 is the effective focal length of the second lens and F is the total effective focal length of the optical lens. More specifically, F2 and F can further satisfy: F2 / F≥2. Satisfying F2 / F≥1.8 is beneficial for the second lens to have a longer focal length, helps the light to transition smoothly, and reduces the sensitivity of the second lens.

[0103] In an exemplary embodiment, the optical lens according to the present application can satisfy: F3 / F≥1.8, where F3 is the effective focal length of the third lens and F is the total effective focal length of the optical lens. More specifically, F3 and F can further satisfy: F3 / F≥2. Satisfying F3 / F≥1.8 is beneficial for the third lens to have a longer focal length, helps the light to transition smoothly, and reduces the sensitivity of the third lens.

[0104] In an exemplary embodiment, the optical lens according to the present application can satisfy: F4 / F≤1.95, where F4 is the effective focal length of the fourth lens and F is the total effective focal length of the optical lens. More specifically, F4 and F can further satisfy: F4 / F≤1.7. Satisfying F4 / F≤1.95 is beneficial for the fourth lens to have a shorter focal length, helps to converge light, and achieve a small FNO.

[0105] In an exemplary embodiment, the optical lens according to the present application can satisfy: D / H / F≤0.3, where D is the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, and F is the total effective focal length of the optical lens. More specifically, D, H, and F can further satisfy: D / H / F≤0.2. Satisfying D / H / F≤0.3 is beneficial for the lens to have the characteristics of a large target surface and a small aperture under the condition that the total effective focal length of the lens remains unchanged.

[0106] In an exemplary embodiment, the optical lens according to the present application can satisfy: F3 / F4≥2, where F3 is the effective focal length of the third lens and F4 is the effective focal length of the fourth lens. More specifically, F3 and F4 can further satisfy: F3 / F4≥2.3. Satisfying F3 / F4≥2 helps the light to transition smoothly and is beneficial for improving the image quality.

[0107] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0≤d0 / TTL≤0.3, where d0 is the distance on the optical axis from the diaphragm to the center of the first side of the first lens, and TTL is the total length of the optical lens. More specifically, d0 and TTL can further satisfy: 0≤d0 / TTL≤0.15. Satisfying 0≤d0 / TTL≤0.3 is beneficial for the assembly of the diaphragm and each lens.

[0108] In an exemplary embodiment, the optical lens according to the present application may satisfy: F23 / F≥1.8, where F23 is the combined focal length of the second lens and the third lens, and F is the total effective focal length of the optical lens. More specifically, F23 and F may further satisfy: F23 / F≥2. Satisfying F23 / F≥1.8 is beneficial to reasonably control the light path between the second lens and the third lens, helps the light to transition smoothly, and reduces the sensitivity of the second lens and the third lens.

[0109] In an exemplary embodiment, the optical lens according to the present application may satisfy: BFL / SL≥0.15, where BFL is the back focal length of the optical lens, and SL is the distance on the optical axis from the aperture to the center of the second side of the fourth lens. More specifically, BFL and SL may further satisfy: BFL / SL≥0.18. Satisfying BFL / SL≥0.15 is beneficial to making the lens have a longer back focal length BFL on the basis of achieving miniaturization, which is beneficial to the assembly of the lens.

[0110] In an exemplary embodiment, the optical lens according to the present application may satisfy: D / H / tan(FOV)≤5.5, where FOV is the maximum field of view angle of the optical lens, D is the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens. More specifically, D, H, and FOV may further satisfy: D / H / tan(FOV)≤4.8. Satisfying D / H / tan(FOV)≤5.5 is beneficial to reducing the front aperture diameter and is beneficial to achieving miniaturization.

[0111] In an exemplary embodiment, if necessary, the optical lens of the present application may further include a filter and / or a protective glass disposed between the fourth lens and the imaging surface to filter light rays with different wavelengths and prevent damage to the image-side elements (such as chips) of the optical lens.

[0112] In an exemplary embodiment, the first lens to the fourth lens may be spherical lenses or aspherical lenses. Exemplarily, the first lens, the second lens, and the fourth lens may be spherical lenses; the third lens may be an aspherical lens. The third lens being an aspherical lens is beneficial to improving the lens resolution and reducing the CRA. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on the imaging quality, the number of aspherical lenses can be increased. In particular, in order to improve the resolution quality of the optical system, the first lens, the second lens, the third lens, and the fourth lens may all be aspherical lenses. The characteristic of an aspherical lens is that the curvature continuously changes from the center to the periphery of the lens. Different from a spherical lens with a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality of the lens. The setting of the aspherical lens helps to correct the system aberration and improve the resolution.

[0113] According to the above-described embodiment of the present application, through the reasonable setting of the shapes and optical powers of the respective lenses, in the case of only using 4 lenses, the optical lens achieves at least one beneficial effect such as high resolution, small CRA, long back focal length, miniaturization, large aperture, small FNO, low cost, and good imaging quality. The diaphragm of this optical lens is front-mounted, the back focal length is long, and the CRA is small, which is beneficial for mounting a large-sized light source or detector, beneficial for achieving high resolution, and beneficial for improving the assemblability of the lens; at the same time, it is also beneficial for significantly reducing the total length of this optical lens, achieving lens miniaturization, and facilitating assembly in a limited space in some special fields.

[0114] In an exemplary embodiment, the first lens, the second lens, the third lens, and the fourth lens may all be glass lenses. The optical lens made of glass can suppress the shift of the back focal length of the optical lens with temperature change to improve the system stability. At the same time, using glass material can avoid the blurring of the lens imaging caused by the high and low temperature changes in the use environment, which affects the normal use of the lens. For example, an optical lens with a full glass design has a wide temperature range and can maintain stable optical performance in the range of -40°C to 105°C. Specifically, when focusing on the resolution quality and reliability, the first lens to the fourth lens may all be glass aspherical lenses. Of course, in application scenarios with lower temperature stability requirements, the first lens to the fourth lens in the optical lens may also all be made of plastic. Making the optical lens with plastic can effectively reduce the manufacturing cost. Of course, the first lens to the fourth lens in the optical lens may also be made of a combination of plastic and glass.

[0115] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the 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. Specific embodiments of the optical lens applicable to the above embodiments are further described below with reference to the accompanying drawings.

[0116] Example 1

[0117] The following refers to Figure 1 An optical lens according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of the optical lens according to Embodiment 1 of the present application is shown.

[0118] As Figure 1 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 along the optical axis from the first side to the second side.

[0119] The first lens L1 is a biconvex lens with a positive optical power, its first side S2 is a convex surface, and its second side S3 is a convex surface. The second lens L2 is a convex-concave lens with a positive optical power, its first side S4 is a convex surface, and its second side S5 is a concave surface. The third lens L3 is a concave-convex lens with a positive optical power, its first side S6 is a concave surface, and its second side S7 is a convex surface. The fourth lens L4 is a biconvex lens with a positive optical power, its first side S8 is a convex surface, and its second side S9 is a convex surface.

[0120] The optical lens provided in this application can be used as, for example, a vehicle-mounted lens. At this time, light from an object sequentially passes through each surface S1 to S9 and finally forms an image on the imaging surface provided on the second side, where an image sensing chip IMA is provided at the imaging surface. It should be understood that the optical lens provided in this application can also be used as, for example, a projection lens or a lidar emission-end lens. At this time, light from the image source side sequentially passes through each surface S9 to S1 and finally projects onto a projection surface (not shown) provided on the first side, where an image sensing chip IMA is provided at the image source surface.

[0121] The optical lens may further include a diaphragm STO, and the diaphragm STO can be disposed between the first side and the first lens L1 to improve the imaging quality. For example, the diaphragm STO can be disposed at a position between the first side and the first lens L1 close to the first side S2 of the first lens L1.

[0122] Table 1 shows the radius of curvature R, thickness / distance d (it should be understood that the thickness / distance d in the row where STOP is located is the spacing distance d0 between the aperture STOP and the first lens L1, the thickness / distance d in the row where S2 is located is the central thickness d1 of the first lens L1, and so on), refractive index Nd, and Abbe number Vd of each lens of the optical lens of Embodiment 1.

[0123]

[0124] Table 1

[0125] In Embodiment 1, both the object side S6 and the image side S7 of the third lens L3 can be aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0126]

[0127] where x is the sagitta, the distance from the vertex of the aspherical surface at the position with height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the conic coefficient k and the high-order term coefficients A4, A6, A8, A10, and A12 that can be used for the aspherical surfaces S6 and S7 in Embodiment 1.

[0128] Surface number k A4 A6 A8 A10 A12 S6 -2.725E-01 -1.780E-03 1.878E-04 -4.601E-06 1.604E-07 -2.675E-09 S7 -1.752E-01 5.695E-04 2.570E-05 4.168E-06 -2.264E-07 5.949E-09

[0129] Table 2

[0130] Example 2

[0131] The following refers to Figure 2 describes the optical lens according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 2 shows a schematic structural diagram of the optical lens according to Embodiment 2 of the present application.

[0132] As Figure 2 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 along the optical axis from the first side to the second side.

[0133] The first lens L1 is a biconvex lens with a positive optical power. Its first side S2 is a convex surface, and its second side S3 is a convex surface. The second lens L2 is a convex-concave lens with a positive optical power. Its first side S4 is a convex surface, and its second side S5 is a concave surface. The third lens L3 is a concave-convex lens with a positive optical power. Its first side S6 is a concave surface, and its second side S7 is a convex surface. The fourth lens L4 is a biconvex lens with a positive optical power. Its first side S8 is a convex surface, and its second side S9 is a convex surface.

[0134] The optical lens provided in this application can be used as, for example, a vehicle-mounted lens. In this case, light from an object sequentially passes through each surface S1 to S9 and finally forms an image on an imaging surface provided on the second side. Among them, an image sensor chip IMA is provided at the imaging surface. It should be understood that the optical lens provided in this application can also be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, light from the image source side sequentially passes through each surface S9 to S1 and finally projects onto a projection surface (not shown) provided on the first side. Among them, an image sensor chip IMA is provided at the image source surface.

[0135] The optical lens may further include a diaphragm STO. The diaphragm STO can be disposed between the first side and the first lens L1 to improve the imaging quality. For example, the diaphragm STO can be disposed at a position between the first side and the first lens L1 close to the first side S2 of the first lens L1.

[0136] Table 3 shows the radius of curvature R, thickness / distance d, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 2. Table 4 shows the conic coefficient and high-order term coefficient that can be used for each aspherical mirror surface in Example 2. Among them, each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0137]

[0138] Table 3

[0139] Surface number k A4 A6 A8 A10 A12 S6 -3.759E-01 -1.773E-03 1.875E-04 -4.620E-06 1.606E-07 -2.813E-09 S7 -2.195E-01 5.602E-04 2.533E-05 4.169E-06 -2.273E-07 5.820E-09

[0140] Table 4

[0141] Example 3

[0142] The following refers to Figure 3 describes the optical lens according to Embodiment 3 of the present application. Figure 3 shows a schematic structural diagram of the optical lens according to Embodiment 3 of the present application.

[0143] As Figure 3 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 along the optical axis from the first side to the second side.

[0144] The first lens L1 is a biconvex lens with a positive optical power. Its first side S2 is a convex surface, and its second side S3 is a convex surface. The second lens L2 is a convex-concave lens with a positive optical power. Its first side S4 is a convex surface, and its second side S5 is a concave surface. The third lens L3 is a concave-convex lens with a positive optical power. Its first side S6 is a concave surface, and its second side S7 is a convex surface. The fourth lens L4 is a convex-concave lens with a positive optical power. Its first side S8 is a convex surface, and its second side S9 is a concave surface.

[0145] The optical lens provided in this application can be used as, for example, a vehicle-mounted lens. In this case, light from an object sequentially passes through each surface S1 to S9 and finally forms an image on the imaging surface provided on the second side. Among them, an image sensing chip IMA is provided at the imaging surface. It should be understood that the optical lens provided in this application can also be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, light from the image source side sequentially passes through each surface S9 to S1 and finally projects onto a projection surface (not shown) provided on the first side. Among them, an image sensing chip IMA is provided at the image source surface.

[0146] The optical lens may further include a diaphragm STO. The diaphragm STO can be disposed between the first side and the first lens L1 to improve the imaging quality. For example, the diaphragm STO can be disposed at a position between the first side and the first lens L1 close to the first side S2 of the first lens L1.

[0147] Table 5 shows the radius of curvature R, thickness / distance d, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 3. Table 6 shows the conic coefficient and high-order term coefficient that can be used for each aspherical mirror surface in Example 3. Among them, each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0148]

[0149] Table 5

[0150] Surface number k A4 A6 A8 A10 A12 S6 -1.788E+00 -7.999E-04 5.460E-05 4.990E-07 -8.772E-08 2.182E-09 S7 -3.698E-01 6.476E-04 -9.553E-06 3.798E-06 -1.821E-07 3.303E-09

[0151] Table 6

[0152] Example 4

[0153] The following refers to Figure 4 describes the optical lens according to Embodiment 4 of this application. Figure 4 shows a schematic structural diagram of the optical lens according to Embodiment 4 of this application.

[0154] As Figure 4 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 along the optical axis from the first side to the second side.

[0155] The first lens L1 is a biconvex lens with a positive focal power. Its first side S2 is a convex surface, and its second side S3 is a convex surface. The second lens L2 is a convex-concave lens with a positive focal power. Its first side S4 is a convex surface, and its second side S5 is a concave surface. The third lens L3 is a concave-convex lens with a positive focal power. Its first side S6 is a concave surface, and its second side S7 is a convex surface. The fourth lens L4 is a convex-concave lens with a positive focal power. Its first side S8 is a convex surface, and its second side S9 is a concave surface.

[0156] The optical lens provided in this application can be used as, for example, a vehicle-mounted lens. In this case, light from an object sequentially passes through each surface S1 to S9 and finally forms an image on an imaging surface provided on the second side, where an image sensing chip IMA is provided at the imaging surface. It should be understood that the optical lens provided in this application can also be used as, for example, a projection lens or a transmitting end lens of a lidar. In this case, light from the image source side sequentially passes through each surface S9 to S1 and finally projects onto a projection surface (not shown) provided on the first side, where an image sensing chip IMA is provided at the image source surface.

[0157] The optical lens may further include a diaphragm STO. The diaphragm STO can be disposed between the first side and the first lens L1 to improve the imaging quality. For example, the diaphragm STO can be disposed at a position between the first side and the first lens L1, close to the first side S2 of the first lens L1.

[0158] Table 7 shows the radius of curvature R, thickness / distance d, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 4. Table 8 shows the conic coefficient and higher-order term coefficients that can be used for each aspherical mirror surface in Example 4, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0159]

[0160] Table 7

[0161] Surface number k A4 A6 A8 A10 A12 S6 -1.548E+00 -7.930E-04 5.485E-05 4.911E-07 -8.811E-08 2.191E-09 S7 -3.329E-01 6.525E-04 -9.279E-06 3.788E-06 -1.822E-07 3.309E-09

[0162] Table 8

[0163] Example 5

[0164] The following refers to Figure 5 describes the optical lens according to Embodiment 5 of this application. Figure 5 shows a schematic structural diagram of the optical lens according to Embodiment 5 of this application.

[0165] As Figure 5 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 along the optical axis from the first side to the second side.

[0166] The first lens L1 is a concavo-convex lens with a positive optical power, its first side S2 is concave, and its second side S3 is convex. The second lens L2 is a convexo-concave lens with a positive optical power, its first side S4 is convex, and its second side S5 is concave. The third lens L3 is a concavo-convex lens with a positive optical power, its first side S6 is concave, and its second side S7 is convex. The fourth lens L4 is a biconvex lens with a positive optical power, its first side S8 is convex, and its second side S9 is convex.

[0167] The optical lens provided in this application can be used as, for example, a vehicle-mounted lens. In this case, light from an object sequentially passes through each surface S1 to S9 and finally forms an image on an imaging surface provided on the second side, where an image sensor chip IMA is provided. It should be understood that the optical lens provided in this application can also be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, light from the image source side sequentially passes through each surface S9 to S1 and finally projects onto a projection surface (not shown) provided on the first side, where an image sensor chip IMA is provided.

[0168] The optical lens may further include a diaphragm STO, and the diaphragm STO can be disposed between the first side and the first lens L1 to improve the imaging quality. For example, the diaphragm STO can be disposed at a position between the first side and the first lens L1 close to the first side S2 of the first lens L1.

[0169] Table 9 shows the radius of curvature R, thickness / distance d, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 5. Table 10 shows the conic coefficient and high-order term coefficient that can be used for each aspherical mirror surface in Example 5, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0170]

[0171] Table 9

[0172] Surface number k A4 A6 A8 A10 A12 S6 -8.036E-02 -1.464E-03 9.429E-05 -1.461E-06 2.534E-08 6.687E-10 S7 -2.098E-01 1.121E-04 -1.889E-05 4.050E-06 -1.524E-07 2.384E-09

[0173] Table 10

[0174] Example 6

[0175] The following refers to Figure 6 describes the optical lens according to Embodiment 6 of this application. Figure 6 shows a schematic structural diagram of the optical lens according to Embodiment 6 of this application.

[0176] As Figure 6 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 along the optical axis from the first side to the second side.

[0177] The first lens L1 is a concavo-convex lens with a positive optical power. Its first side S2 is concave, and its second side S3 is convex. The second lens L2 is a convexo-concave lens with a positive optical power. Its first side S4 is convex, and its second side S5 is concave. The third lens L3 is a concavo-convex lens with a positive optical power. Its first side S6 is concave, and its second side S7 is convex. The fourth lens L4 is a biconvex lens with a positive optical power. Its first side S8 is convex, and its second side S9 is convex.

[0178] The optical lens provided in this application can be used as, for example, a vehicle-mounted lens. In this case, the light from the object sequentially passes through each surface S1 to S9 and finally forms an image on the imaging surface provided on the second side, where an image sensor chip IMA is provided. It should be understood that the optical lens provided in this application can also be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, the light from the image source side sequentially passes through each surface S9 to S1 and finally projects onto a projection surface (not shown) provided on the first side, where an image sensor chip IMA is provided.

[0179] The optical lens may further include a diaphragm STO. The diaphragm STO can be disposed between the first side and the first lens L1 to improve the imaging quality. For example, the diaphragm STO can be disposed at a position between the first side and the first lens L1 close to the first side S2 of the first lens L1.

[0180] Table 11 shows the radius of curvature R, thickness / distance d, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 6. Table 12 shows the conic coefficient and high-order term coefficient that can be used for each aspherical mirror surface in Example 6, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0181]

[0182] Table 11

[0183] Surface number k A4 A6 A8 A10 A12 S6 -7.938E-02 -1.463E-03 9.420E-05 -1.463E-06 2.541E-08 6.756E-10 S7 -2.100E-01 1.116E-04 -1.891E-05 4.049E-06 -1.524E-07 2.385E-09

[0184] Table 12

[0185] Example 7

[0186] The following refers to Figure 7 describes the optical lens according to Embodiment 7 of the present application. Figure 7 shows a schematic structural diagram of the optical lens according to Embodiment 7 of the present application.

[0187] As Figure 7 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 along the optical axis from the first side to the second side.

[0188] The first lens L1 is a concavo-convex lens with a positive optical power. Its first side S2 is concave, and its second side S3 is convex. The second lens L2 is a convexo-concave lens with a positive optical power. Its first side S4 is convex, and its second side S5 is concave. The third lens L3 is a concavo-convex lens with a positive optical power. Its first side S6 is concave, and its second side S7 is convex. The fourth lens L4 is a convexo-concave lens with a positive optical power. Its first side S8 is convex, and its second side S9 is concave.

[0189] The optical lens provided in this application can be used as, for example, a vehicle-mounted lens. In this case, the light from the object sequentially passes through each surface S1 to S9 and finally forms an image on the imaging surface provided on the second side, where an image sensor chip IMA is provided at the imaging surface. It should be understood that the optical lens provided in this application can also be used as, for example, a projection lens or a laser radar transmitting-end lens. In this case, the light from the image source side sequentially passes through each surface S9 to S1 and finally projects onto a projection surface (not shown) provided on the first side, where an image sensor chip IMA is provided at the image source surface.

[0190] The optical lens may further include a diaphragm STO, and the diaphragm STO can be disposed between the first side and the first lens L1 to improve the imaging quality. For example, the diaphragm STO can be disposed at a position close to the first side S2 of the first lens L1 between the first side and the first lens L1.

[0191] Table 13 shows the radius of curvature R, thickness / distance d, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 7. Table 14 shows the conic coefficient and high-order term coefficient of each aspherical mirror surface that can be used in Example 7, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0192]

[0193] Table 13

[0194] Surface number k A4 A6 A8 A10 A12 S6 -1.528E+00 -9.264E-04 2.952E-05 1.484E-06 -6.690E-08 8.588E-10 S7 -1.448E-01 7.104E-04 -1.946E-05 4.477E-06 -1.776E-07 2.937E-09

[0195] Table 14

[0196] Example 8

[0197] The following refers to Figure 8 describes the optical lens according to Embodiment 8 of this application. Figure 8 shows a schematic structural diagram of the optical lens according to Embodiment 8 of this application.

[0198] As Figure 8 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 along the optical axis from the first side to the second side.

[0199] The first lens L1 is a concavo-convex lens with a positive optical power. Its first side S2 is concave, and its second side S3 is convex. The second lens L2 is a convex-concave lens with a positive optical power. Its first side S4 is convex, and its second side S5 is concave. The third lens L3 is a concavo-convex lens with a positive optical power. Its first side S6 is concave, and its second side S7 is convex. The fourth lens L4 is a convex-concave lens with a positive optical power. Its first side S8 is convex, and its second side S9 is concave.

[0200] The optical lens provided in this application can be used as, for example, a vehicle-mounted lens. In this case, the light from an object sequentially passes through each surface S1 to S9 and finally forms an image on the imaging surface provided on the second side. Among them, an image sensing chip IMA is provided at the imaging surface. It should be understood that the optical lens provided in this application can also be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, the light from the image source side sequentially passes through each surface S9 to S1 and finally projects onto a projection surface (not shown) provided on the first side. Among them, an image sensing chip IMA is provided at the image source surface.

[0201] The optical lens may further include a diaphragm STO. The diaphragm STO can be disposed between the first side and the first lens L1 to improve the imaging quality. For example, the diaphragm STO can be disposed at a position close to the first side S2 of the first lens L1 between the first side and the first lens L1.

[0202] Table 15 shows the radius of curvature R, thickness / distance d, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 8. Table 16 shows the conic coefficient and high-order term coefficient that can be used for each aspherical mirror surface in Example 8. Among them, each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0203]

[0204] Table 15

[0205] Surface number k A4 A6 A8 A10 A12 S6 -1.595E+00 -8.930E-04 2.752E-05 1.341E-06 -6.369E-08 8.719E-10 S7 -2.140E-01 7.690E-04 -2.581E-05 4.534E-06 -1.721E-07 2.653E-09

[0206] Table 16

[0207] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Tables 17-1 and 17-2 below. In Tables 17-1 and 17-2, the units of F, ENPD, TTL, H, BFL, SL, TL, d0, L, D, R4, R5, sag4, sag5, sag6, sag7, F1, F2, F3, F4, and F23 are millimeters (mm), and the unit of FOV is degrees (°).

[0208]

[0209]

[0210] Table 17-1

[0211]

[0212]

[0213] Table 17-2

[0214] The present application also provides an electronic device, which may include an optical lens according to the above embodiments of the present application and an imaging element for converting the optical image formed by the optical lens into an electrical signal. The electronic device may be an independent electronic device such as a distance detection camera, or an imaging module integrated on a distance detection device. In addition, the electronic device may also be an independent imaging device such as a vehicle-mounted camera, or an imaging module integrated on an assisted driving system.

[0215] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principle. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, a technical solution formed by mutually replacing the above features with technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. An optical lens, characterized in that, The optical lens sequentially includes, along the optical axis, from the first side to the second side: A first lens with positive optical power, whose second side is convex; A second lens with positive optical power, whose first side is convex and second side is concave; A third lens with positive optical power, whose first side is concave and second side is convex; and A fourth lens with positive optical power, whose first side is convex; Wherein, the number of lenses with optical power in the optical lens is four; The effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy: F4 / F ≤ 1.95; The effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: 7.286 ≥ F3 / F ≥ 1.

8.

2. The optical lens according to claim 1, wherein The first side of the first lens is convex.

3. The optical lens according to claim 1, wherein, The first side of the first lens is concave.

4. The optical lens according to claim 1, characterized in that, The second side of the fourth lens is concave.

5. The optical lens according to claim 1, characterized in that, The second side of the fourth lens is convex.

6. The optical lens according to any one of claims 1-5, characterized in that, The total length TTL of the optical lens and the total effective focal length F of the optical lens satisfy: 1.765 ≤ TTL / F ≤ 4.

5.

7. The optical lens according to any one of claims 1-5, characterized in that, The total length TTL of the optical lens, the maximum field of view FOV of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 0.149 ≤ TTL / H / FOV ≤ 0.

3.

8. The optical lens according to any one of claims 1-5, characterized in that, The back focal length BFL of the optical lens and the distance TL on the optical axis from the center of the first side of the first lens to the center of the second side of the fourth lens satisfy: 0.332 ≥ BFL / TL ≥ 0.

15.

9. The optical lens according to any one of claims 1-5, characterized in that, The maximum field of view FOV of the optical lens, the maximum clear aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: D / H / FOV × 1° ≤ 0.

1.

10. The optical lens according to any one of claims 1-5, characterized in that, The maximum field of view FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 52.693° ≤ (FOV × F) / H ≤ 70°.

11. The optical lens according to any one of claims 1-5, characterized in that, The back focal length BFL of the optical lens and the total length TTL of the optical lens satisfy: 0.234 ≥ BFL / TTL ≥ 0.

1.

12. The optical lens according to any one of claims 1-5, characterized in that, The sagittal height sag4 at the maximum clear aperture of the first side of the second lens corresponding to the maximum field of view of the optical lens and the sagittal height sag5 at the maximum clear aperture of the second side of the second lens corresponding to the maximum field of view of the optical lens satisfy: 0.5 ≤ sag4 / sag5 ≤ 2.

5.

13. The optical lens according to any one of claims 1-5, characterized in that, The sagittal height sag6 at the maximum clear aperture of the first side of the third lens corresponding to the maximum field of view of the optical lens and the sagittal height sag7 at the maximum clear aperture of the second side of the third lens corresponding to the maximum field of view of the optical lens satisfy: 0.2 ≤ sag6 / sag7 ≤ 2.

2.

14. The optical lens according to any one of claims 1-5, characterized in that, The optical lens further includes a diaphragm disposed between the first side and the first lens, wherein, The distance L from the center of the aperture to the second side of the optical lens on the optical axis, the maximum field of view angle FOV of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the total length TTL of the optical lens satisfy: FOV×H / L / TTL≤0.7° / mm.

15. The optical lens according to any one of claims 1-5, characterized in that, The maximum field of view FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 0.5 ≤ F×tan(FOV / 2) / (H / 2) ≤ 2.

16. The optical lens according to any one of claims 1-5, characterized in that, The image height H corresponding to the maximum field of view angle of the optical lens and the total length TTL of the optical lens satisfy: TTL / H≤7.

17. The optical lens according to any one of claims 1-5, characterized in that, The effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: 4.719≥F1 / F≥1.

5.

18. The optical lens according to any one of claims 1-5, characterized in that, The effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy: 9.696≥F2 / F≥1.

8.

19. The optical lens according to any one of claims 1-5, characterized in that, The maximum clear aperture D of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the total effective focal length F of the optical lens satisfy: D / H / F ≤ 0.3 mm -1 .

20. The optical lens according to any one of claims 1-5, characterized in that, The effective focal length F3 of the third lens and the effective focal length F4 of the fourth lens satisfy: 5.552≥F3 / F4≥2.

21. The optical lens according to any one of claims 1-5, characterized in that, The optical lens further includes an aperture disposed between the first side and the first lens, wherein, The distance d0 from the center of the aperture to the center of the first side of the first lens on the optical axis and the total length TTL of the optical lens satisfy: 0≤d0 / TTL≤0.

3.

22. The optical lens according to any one of claims 1-5, characterized in that, The combined focal length F23 of the second lens and the third lens and the total effective focal length F of the optical lens satisfy: 4.249≥F23 / F≥1.

8.

23. The optical lens according to any one of claims 1-5, characterized in that, The optical lens further includes an aperture disposed between the first side and the first lens, wherein, The back focal length BFL of the optical lens and the distance SL from the center of the aperture to the center of the second side of the fourth lens on the optical axis satisfy: 0.305≥BFL / SL≥0.

15.

24. The optical lens according to any one of claims 1-5, characterized in that, The maximum field of view angle FOV of the optical lens, the maximum clear aperture D of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, and the image height H corresponding to the maximum field of view angle of the optical lens satisfy: 4.189≤D / H / tan(FOV)≤5.

5.

25. Optical lens, characterized in that, The optical lens sequentially includes, along the optical axis, from the first side to the second side: A first lens with a positive optical power, whose second side is convex; A second lens with a positive optical power, whose first side is convex and second side is concave; A third lens with a positive optical power, whose first side is concave and second side is convex; and A fourth lens with a positive optical power, whose first side is convex; The total effective focal length F of the optical lens and the entrance pupil diameter EPND of the optical lens satisfy: 1.090≤F / EPND≤1.5; Wherein, the number of lenses with optical power in the optical lens is four; The effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy: F4 / F≤1.95; The effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: 7.286≥F3 / F≥1.

8.

26. The optical lens according to claim 25, characterized in that, The first side of the first lens is convex.

27. The optical lens according to claim 25, wherein, The first side of the first lens is concave.

28. The optical lens according to claim 25, wherein The second side of the fourth lens is concave.

29. The optical lens according to claim 25, wherein The second side of the fourth lens is convex.

30. The optical lens according to any one of claims 25-29, characterized in that, The total length TTL of the optical lens and the total effective focal length F of the optical lens satisfy: 1.765 ≤ TTL / F ≤ 3.

31. The optical lens according to any one of claims 25-29, characterized in that, The total length TTL of the optical lens, the maximum field of view FOV of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 0.149 ≤ TTL / H / FOV ≤ 0.

2.

32. The optical lens according to any one of claims 25-29, characterized in that, The back focal length BFL of the optical lens and the distance TL on the optical axis from the center of the first side of the first lens to the center of the second side of the fourth lens satisfy: 0.332 ≥ BFL / TL ≥ 0.

18.

33. The optical lens according to any one of claims 25-29, characterized in that, The maximum field of view FOV of the optical lens, the maximum aperture diameter D of the first side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 0.078 ≤ D / H / FOV×1° ≤ 0.

085.

34. The optical lens according to any one of claims 25-29, characterized in that, The maximum field of view FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 52.693° ≤ (FOV×F) / H ≤ 65°.

35. The optical lens according to any one of claims 25-29, characterized in that, The back focal length BFL of the optical lens and the total length TTL of the optical lens satisfy: 0.234 ≥ BFL / TTL ≥ 0.

15.

36. The optical lens according to any one of claims 25-29, characterized in that, The sagittal height sag4 at the maximum aperture diameter of the first side of the second lens corresponding to the maximum field of view of the optical lens and the sagittal height sag5 at the maximum aperture diameter of the second side of the second lens corresponding to the maximum field of view of the optical lens satisfy: 0.7 ≤ sag4 / sag5 ≤ 2.

2.

37. The optical lens according to any one of claims 25-29, characterized in that, The sagittal height sag6 at the maximum aperture diameter of the first side of the third lens corresponding to the maximum field of view of the optical lens and the sagittal height sag7 at the maximum aperture diameter of the second side of the third lens corresponding to the maximum field of view of the optical lens satisfy: 0.65 ≤ sag6 / sag7 ≤ 2.

38. The optical lens according to any one of claims 25-29, characterized in that, The optical lens further includes a diaphragm disposed between the first side and the first lens, wherein, The distance L on the optical axis from the center of the diaphragm to the second side of the optical lens, the maximum field of view FOV of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the total length TTL of the optical lens satisfy: 0.248° / mm ≤ FOV×H / L / TTL ≤ 0.4° / mm.

39. The optical lens according to any one of claims 25-29, characterized in that, The maximum field of view FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 0.8 ≤ F×tan(FOV / 2) / (H / 2) ≤ 1.

5.

40. The optical lens according to any one of claims 25-29, characterized in that, The image height H corresponding to the maximum field of view of the optical lens and the total length TTL of the optical lens satisfy: 3.782 ≤ TTL / H ≤ 5.

41. The optical lens according to any one of claims 25-29, characterized in that, The effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: 4.719 ≥ F1 / F ≥ 1.

8.

42. The optical lens according to any one of claims 25-29, characterized in that, The effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy: 9.696 ≥ F2 / F ≥ 2.

43. The optical lens according to any one of claims 25-29, characterized in that, The maximum clear aperture D of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the total effective focal length F of the optical lens satisfy: 0.156mm -1 ≤D / H / F≤0.2mm -1 .

44. The optical lens according to any one of claims 25-29, characterized in that, The effective focal length F3 of the third lens and the effective focal length F4 of the fourth lens satisfy: 5.552 ≥ F3 / F4 ≥ 2.

3.

45. The optical lens according to any one of claims 25-29, characterized in that, The optical lens further includes a diaphragm disposed between the first side and the first lens, wherein, The distance d0 on the optical axis from the center of the aperture to the center of the first side of the first lens and the total length TTL of the optical lens satisfy: 0 ≤ d0 / TTL ≤ 0.

15.

46. The optical lens according to any one of claims 25-29, characterized in that, The combined focal length F23 of the second lens and the third lens and the total effective focal length F of the optical lens satisfy: 4.249 ≥ F23 / F ≥ 2.

47. The optical lens according to any one of claims 25-29, characterized in that, The optical lens further includes an aperture disposed between the first side and the first lens, wherein The back focal length BFL of the optical lens and the distance SL on the optical axis from the center of the aperture to the center of the second side of the fourth lens satisfy: 0.305 ≥ BFL / SL ≥ 0.

203.

48. The optical lens according to any one of claims 25-29, characterized in that, The maximum field of view FOV of the optical lens, the maximum clear aperture D of the first side of the first lens corresponding to the maximum field of view of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 4.189 ≤ D / H / tan(FOV) ≤ 4.

8.

49. An electronic device, characterized in that, Comprising the optical lens according to any one of claims 1-48 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

Images