Optical lenses and electronic equipment

Abstract

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

Description

Technical Field

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

[0002] In recent years, optical lens technology has continued to advance, and their applications have become increasingly widespread. For example, optical lenses play an irreplaceable role in a wide range of fields, including smartphones, security surveillance, assisted driving, intelligent detection, and virtual reality. At the same time, lens manufacturers in various fields are actively investing in and improving the performance and technology of optical lenses to enhance the quality and competitiveness of their products.

[0003] With the rapid development of intelligent vehicles, demand for interior vision lenses is increasing. These lenses require excellent performance in the following areas: First, the ambient temperature of these lenses can vary widely due to seasonal and climatic factors. To ensure clear images in both high and low temperatures, it is necessary to suppress the shift in the lens' optical back focus due to temperature fluctuations. Second, image quality is crucial for ensuring driving safety. Lenses with severe ghosting can easily cause system misjudgments, compromising driving safety. Therefore, drivers' interior vision lenses require excellent ghosting suppression capabilities. Furthermore, at night, the interior of a vehicle is often dark, and high relative illumination can enhance the brightness of the image. Furthermore, currently used interior vision lenses generally have a small field of view (FOV). However, interior vision lenses must monitor not only the driver but also all passengers, requiring a wide FOV and a compact size for easy installation. Furthermore, due to the generally dim interior environment, large-aperture lenses are required to improve overall brightness. Therefore, low temperature drift, low ghost image energy, high relative illumination, high resolution, wide angle, large aperture and miniaturization are the current development trends of automotive interior view lenses. Summary of the Invention

[0004] The present application provides an optical lens, which may include, in order from a first side to a second side along an optical axis: a first lens having negative optical power, whose first side surface is convex and whose second side surface is concave; a second lens having negative optical power, whose first side surface is concave and whose second side surface is convex; a third lens having positive optical power, whose first side surface is convex; and a fourth lens having positive optical power, whose first side surface is convex.

[0005] In one embodiment, the second side surface of the third lens is a convex surface.

[0006] In one embodiment, the second side surface of the third lens is a concave surface.

[0007] In one embodiment, the second side surface of the fourth lens is a convex surface.

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

[0009] In one embodiment, the optical lens further includes a stop disposed between the second lens and the third lens.

[0010] In one embodiment, the second side surface of the fourth lens has at least one inflection point.

[0011] In one embodiment, the fourth lens has an aspherical surface.

[0012] 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|≤6.

[0013] In one embodiment, a center thickness dn of a lens with a maximum center thickness in the optical lens and a center thickness dm of a lens with a minimum center thickness in the optical lens on the optical axis may satisfy: dn / dm≤7.

[0014] In one embodiment, the temperature deviation coefficient dn3 / dt of the third lens may satisfy: dn3 / dt≥-8×10 -6 .

[0015] In one embodiment, a central curvature radius L1S1 of the first side surface of the first lens and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: L1S1 / TTL≤1.5.

[0016] In one embodiment, a central curvature radius L2S1 of the first side surface of the second lens and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: |L2S1 / TTL|≤0.5.

[0017] 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|≤1.28.

[0018] In one embodiment, a central curvature radius L2S1 of the first side surface of the second lens and a central curvature radius L2S2 of the second side surface of the second lens may satisfy: 0.2≤L2S1 / L2S2≤5.

[0019] In one embodiment, a distance TTL from the center of the first side surface of the first lens to the imaging plane of the optical lens on the optical axis, a maximum field of view FOV of the optical lens, and an image height H corresponding to the maximum field of view of the optical lens may satisfy the following conditions: TTL / H / FOV≤0.06.

[0020] In one embodiment, a central curvature radius L1S1 of the first side surface of the first lens and a central curvature radius L1S2 of the second side surface of the first lens may satisfy: 2≤L1S1 / L1S2≤7.

[0021] In one embodiment, a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis and an image height H corresponding to the maximum field angle of the optical lens may satisfy the following: TTL / H≤6.

[0022] 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≥40.

[0023] In one embodiment, 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: FOV / H≥30.

[0024] In one embodiment, the total effective focal length F of the optical lens and the F number FNO of the optical lens may satisfy: F / FNO≥1.

[0025] In one embodiment, the opening angle arctan(1 / K(L1S2)) of the second side surface of the first lens at the maximum field angle may satisfy: arctan(1 / K(L1S2))≥50.

[0026] In one embodiment, a central curvature radius L1S2 of the second side surface of the first lens and a central curvature radius L2S1 of the first side surface of the second lens may satisfy: -50≤(L1S2-L2S1) / (L1S2+L2S1)≤1.

[0027] 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|≤35.

[0028] 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|≤7.

[0029] In one embodiment, the total effective focal length F of the optical lens and the central curvature radius L1S1 of the first side surface of the first lens may satisfy: |F / L1S1|≥0.05.

[0030] In one embodiment, the F number FNO of the optical lens satisfies: FNO≤1.8.

[0031] In one embodiment, a distance BFL from the center of the second side surface of the fourth lens to the imaging plane of the optical lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging plane of the optical lens on the optical axis may satisfy: BFL / TTL≥0.05.

[0032] In one embodiment, a distance T34 from the center of the second side surface of the third lens to the center of the first side surface of the fourth lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following conditions: T34 / TTL≤0.02.

[0033] In one embodiment, a central curvature radius L2S1 of the first side surface of the second lens and a central curvature radius L2S2 of the second side surface of the second lens satisfy: -10≤(L2S1+L2S2) / (L2S1-L2S2)≤-1.

[0034] In one embodiment, the maximum light clearance D of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the radian value θ corresponding to the maximum field of view of the optical lens may satisfy: D / H / θ≤3.

[0035] In one embodiment, a distance TTL from the center of the first side surface of the first lens to the imaging plane of the optical lens on the optical axis and a total effective focal length F of the optical lens may satisfy the following: TTL / F≤15.

[0036] In one embodiment, a distance T12 from the center of the second side surface of the first lens to the center of the first side surface of the second lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: T12 / TTL≤0.35.

[0037] Another aspect of the present application provides an optical lens, which may include, in order from a first side to a second side along an optical axis: a first lens having negative optical power; a second lens having negative optical power; a third lens having positive optical power; and a fourth lens having positive optical power. A distance TTL from a center of a first side surface of the first lens to an imaging plane of the optical lens on the optical axis and a total effective focal length F of the optical lens may satisfy the following: TTL / F ≤ 15.

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

[0039] In one embodiment, the first side surface of the second lens is concave, and the second side surface is convex.

[0040] In one embodiment, the first side surface of the third lens is a convex surface, and the second side surface is a convex surface.

[0041] In one embodiment, the first side surface of the third lens is convex, and the second side surface is concave.

[0042] In one embodiment, the first side surface of the fourth lens is a convex surface, and the second side surface is a convex surface.

[0043] In one embodiment, the first side surface of the fourth lens is convex, and the second side surface is concave.

[0044] In one embodiment, the optical lens further includes a stop disposed between the second lens and the third lens.

[0045] In one embodiment, the second side surface of the fourth lens has at least one inflection point.

[0046] In one embodiment, the fourth lens has an aspherical surface.

[0047] 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|≤6.

[0048] In one embodiment, a center thickness dn of a lens with a maximum center thickness in the optical lens and a center thickness dm of a lens with a minimum center thickness in the optical lens on the optical axis may satisfy: dn / dm≤7.

[0049] In one embodiment, the temperature deviation coefficient dn3 / dt of the third lens may satisfy: dn3 / dt≥-8×10 -6 .

[0050] In one embodiment, a central curvature radius L1S1 of the first side surface of the first lens and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: L1S1 / TTL≤1.5.

[0051] In one embodiment, a central curvature radius L2S1 of the first side surface of the second lens and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: |L2S1 / TTL|≤0.5.

[0052] 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|≤1.28.

[0053] In one embodiment, a central curvature radius L2S1 of the first side surface of the second lens and a central curvature radius L2S2 of the second side surface of the second lens may satisfy: 0.2≤L2S1 / L2S2≤5.

[0054] In one embodiment, a distance TTL from the center of the first side surface of the first lens to the imaging plane of the optical lens on the optical axis, a maximum field of view FOV of the optical lens, and an image height H corresponding to the maximum field of view of the optical lens may satisfy the following conditions: TTL / H / FOV≤0.06.

[0055] In one embodiment, a central curvature radius L1S1 of the first side surface of the first lens and a central curvature radius L1S2 of the second side surface of the first lens may satisfy: 2≤L1S1 / L1S2≤7.

[0056] In one embodiment, a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis and an image height H corresponding to the maximum field angle of the optical lens may satisfy the following: TTL / H≤6.

[0057] 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≥40.

[0058] In one embodiment, 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: FOV / H≥30.

[0059] In one embodiment, the total effective focal length F of the optical lens and the F number FNO of the optical lens may satisfy: F / FNO≥1.

[0060] In one embodiment, the opening angle arctan(1 / K(L1S2)) of the second side surface of the first lens at the maximum field angle may satisfy: arctan(1 / K(L1S2))≥50.

[0061] In one embodiment, a central curvature radius L1S2 of the second side surface of the first lens and a central curvature radius L2S1 of the first side surface of the second lens may satisfy: -50≤(L1S2-L2S1) / (L1S2+L2S1)≤1.

[0062] 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|≤35.

[0063] 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|≤7.

[0064] In one embodiment, the total effective focal length F of the optical lens and the central curvature radius L1S1 of the first side surface of the first lens may satisfy: |F / L1S1|≥0.05.

[0065] In one embodiment, the F number FNO of the optical lens satisfies: FNO≤1.8.

[0066] In one embodiment, a distance BFL from the center of the second side surface of the fourth lens to the imaging plane of the optical lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging plane of the optical lens on the optical axis may satisfy: BFL / TTL≥0.05.

[0067] In one embodiment, a distance T34 from the center of the second side surface of the third lens to the center of the first side surface of the fourth lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following conditions: T34 / TTL≤0.02.

[0068] In one embodiment, a central curvature radius L2S1 of the first side surface of the second lens and a central curvature radius L2S2 of the second side surface of the second lens satisfy: -10≤(L2S1+L2S2) / (L2S1-L2S2)≤-1.

[0069] In one embodiment, the maximum light clearance D of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the radian value θ corresponding to the maximum field of view of the optical lens may satisfy: D / H / θ≤3.

[0070] In one embodiment, a distance T12 from the center of the second side surface of the first lens to the center of the first side surface of the second lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis may satisfy: T12 / TTL≤0.35.

[0071] Another aspect of the present application provides an electronic device comprising the optical lens provided by the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0072] This application uses four lenses, and by optimizing the surface shape, size, material and optical focal length of each lens, the optical lens has at least one beneficial effect such as low temperature drift, low ghost image energy, high relative illumination, high resolution (million level), miniaturization, large field of view (FOV150) and large aperture (FNO1.45). BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of the embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0074] Figure 1 Schematic diagram showing the structure of an optical lens according to Example 1 of the present application;

[0075] Figure 2 Schematic diagram showing the structure of an optical lens according to Example 2 of the present application;

[0076] Figure 3 Schematic diagram showing the structure of an optical lens according to Example 3 of the present application;

[0077] Figure 4 Schematic diagram showing the structure of an optical lens according to Example 4 of the present application;

[0078] Figure 5 A schematic structural diagram of an optical lens according to Example 5 of the present application is shown; and

[0079] Figure 6 Schematic diagram showing the structure of an optical lens according to Example 6 of the present application. DETAILED DESCRIPTION

[0080] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to 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.

[0081] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0082] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0083] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the image side is called the image-side surface of the lens.

[0084] It should be understood that the optical lens provided in this application can be used for both imaging and projection. When the optical lens provided in this application is used as an imaging lens, the "first side" referred to herein may refer to the object side, and the "second side" may refer to the image side; when the optical lens provided in this application is used as a projection lens or a radar transmitting lens, the "first side" referred to herein may refer to the imaging side, and the "second side" may refer to the image source side.

[0085] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0086] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0087] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0088] The features, principles and other aspects of the present application are described in detail below.

[0089] 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, and the four lenses are sequentially arranged from a first side to a second side along an optical axis.

[0090] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the imaging surface. Optionally, the photosensitive element disposed on the imaging surface may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0091] In an exemplary embodiment, the first lens may have negative optical power. The first lens may have a convex-concave surface. This optical power and surface configuration of the first lens can diverge light, ensuring a smooth transition in light distribution while maximizing the amount of light entering the system at large angles, thereby improving illumination. This also helps reduce the optical path of rear light, thereby achieving a short TTL and increasing light throughput. Furthermore, the relatively convex S1 surface helps diverge light from ghost images reflected by the S1 surface, resulting in a larger light spot at the image plane and a lower energy level, effectively suppressing ghost images.

[0092] In an exemplary embodiment, the second lens may have negative optical power. The second lens may have a concave-convex surface. This optical power and surface configuration of the second lens further converges the light diverging from the first lens, allowing the light to smoothly enter the rear. The curvature radii on both sides of the second lens approach concentric circles, minimizing the optical path difference of the light passing through the two sides of the second lens and ensuring a smooth light transition, which helps reduce the attenuation of relative illumination of the lens and improves relative illumination. Furthermore, the large curvature radius of the first side surface causes the ghost image light reflected from the first side surface to diverge, ultimately resulting in a larger spot size and lower energy level on the image plane, effectively suppressing ghost images.

[0093] In an exemplary embodiment, the third lens may have positive optical power. The third lens may have a convex-convex surface or a convex-concave surface. This optical power and surface configuration of the third lens facilitates convergence of light, allowing divergent light to smoothly enter the rear; the positive optical power, when paired with a biconvex lens, allows for a smooth transition of light, improving the temperature stability and relative illumination of the system; the positive optical power, when paired with a corresponding temperature offset coefficient, offsets the thermal expansion of the lens barrel, reducing temperature drift; the positive optical power, when paired with a fourth lens having positive optical power, can compensate for the spherical aberration introduced by the first two groups of lenses, further correct the aberrations produced by the front lens group, and simultaneously converge the light beam again, thereby increasing the aperture of the lens and shortening the overall length of the lens, making the optical system more compact and having a relatively short overall lens length.

[0094] In an exemplary embodiment, the fourth lens may have positive optical power. The fourth lens may have a convex-convex surface type or a convex-concave surface type. This optical power and surface type setting of the fourth lens is conducive to the smooth entry of light into the image plane, thereby improving the resolution; preferably, the fourth lens may have an aspheric mirror surface, which can further improve the resolution; and the shape of the fourth lens is close to flat, which can further improve the resolution quality. The positive optical power of the fourth lens is combined with the positive optical power lens of the third lens to further reduce the field curvature and correct the off-axis point aberration of the system; adopting a focal length ratio similar to that of the third lens and the fourth lens can meet the requirement of maintaining stable imaging under high and low temperatures. In addition, the second side surface of the fourth lens has at least one inflection point, which helps to further improve the resolution.

[0095] In an exemplary embodiment, the optical lens according to the present application can satisfy the following conditions: |F3 / F| ≤ 6, where F3 is the effective focal length of the third lens element and F is the total effective focal length of the optical lens. More specifically, F3 and F can further satisfy the following conditions: |F3 / F| ≤ 3.5. This condition facilitates thermal compensation, as the positive focal power, combined with the corresponding temperature offset coefficient, offsets the thermal expansion of the lens barrel, resulting in improved image quality at both high and low temperatures.

[0096] In exemplary embodiments, the optical lens according to the present application may satisfy the following relationship: dn / dm ≤ 7, where dn is the center thickness of the lens with the largest center thickness along the optical axis, and dm is the center thickness of the lens with the smallest center thickness along the optical axis. More specifically, dn and dm may further satisfy the following relationship: dn / dm ≤ 5. This dn / dm ≤ 7 ensures uniform lens thickness, stabilizes the function of each lens, minimizes light variations at high and low temperatures, and improves temperature performance.

[0097] In an exemplary embodiment, the optical lens according to the present application may satisfy: dn3 / dt≥-8×10 -6, where dn3 / dt is the temperature deviation coefficient of the third lens. More specifically, dn3 / dt may further satisfy dn3 / dt≥-5×10 -6 dn3 / dt≥-8×10 -6 By reasonably selecting the temperature offset coefficient of the third lens material, the negative temperature offset coefficient is matched with the positive focal length of the third lens, which offsets the thermal expansion of the lens barrel, making the lens thermal compensation effect better.

[0098] In an exemplary embodiment, the optical lens according to the present application may satisfy the following relationship: L1S1 / TTL ≤ 1.5, where L1S1 is the central radius of curvature of the first side surface of the first lens element, and TTL is the distance on the optical axis from the center of the first side surface of the first lens element to the imaging plane of the optical lens element. More specifically, L1S1 and TTL may further satisfy L1S1 / TTL ≤ 1. Meeting L1S1 / TTL ≤ 1.5 helps diverge light from ghost images reflected by the first side surface S1 of the first lens element, ultimately resulting in a larger light spot and lower energy level on the image plane, which helps reduce ghost images reflected from the center between the first lens element and the filter.

[0099] In an exemplary embodiment, the optical lens according to the present application may satisfy the following condition: |L2S1 / TTL|≤0.5, where L2S1 is the central radius of curvature of the first side surface of the second lens element, and TTL is the distance from the center of the first side surface of the first lens element to the imaging plane of the optical lens element on the optical axis. More specifically, L2S1 and TTL may further satisfy |L2S1 / TTL|≤0.25. When |L2S1 / TTL|≤0.5 is satisfied, the radius of curvature of the first side surface of the second lens element is larger, causing ghost image light reflected from the first side surface to diverge, resulting in a larger light spot on the image plane and a lower energy level, which helps reduce ghost images reflected from the center between the second lens element and the filter.

[0100] In an exemplary embodiment, the optical lens according to the present application can satisfy the following conditions: |F3 / F4| ≤ 1.28, where F3 is the effective focal length of the third lens element, and F4 is the effective focal length of the fourth lens element. More specifically, F3 and F4 can further satisfy |F3 / F4| ≤ 1.27. When |F3 / F4| ≤ 1.28 is satisfied, the similar focal lengths of the third and fourth lenses facilitate smooth light transitions, improve chromatic aberration correction, enhance image quality, and effectively enhance lens thermal compensation.

[0101] In an exemplary embodiment, the optical lens according to the present application may satisfy the following: 0.2 ≤ L2S1 / L2S2 ≤ 5, where L2S1 is the central radius of curvature of the first side surface of the second lens element, and L2S2 is the central radius of curvature of the second side surface of the second lens element. More specifically, L2S1 and L2S2 may further satisfy 0.4 ≤ L2S1 / L2S2 ≤ 3. When 0.2 ≤ L2S1 / L2S2 ≤ 5 is satisfied, the curvature radii of the two surfaces of the second lens element are relatively close, and light passing through both surfaces facilitates a smooth transition of light, thereby improving the relative illumination of the lens.

[0102] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: TTL / H / FOV ≤ 0.06, where TTL is the distance on the optical axis from the center of the first side surface of the first lens element to the imaging plane of the optical lens, FOV is the maximum field of view of the optical lens, and H is the image height corresponding to the maximum field of view of the optical lens. More specifically, TTL, H, and FOV may further satisfy TTL / H / FOV ≤ 0.03. Meeting TTL / H / FOV ≤ 0.06 effectively limits the length of the lens, facilitating miniaturization, given the same imaging plane and image height.

[0103] In exemplary embodiments, the optical lens according to the present application may satisfy the following relationship: 2 ≤ L1S1 / L1S2 ≤ 7, where L1S1 is the central radius of curvature of the first side surface of the first lens element, and L1S2 is the central radius of curvature of the second side surface of the first lens element. More specifically, L1S1 and L1S2 may further satisfy 3 ≤ L1S1 / L1S2 ≤ 6. Meeting 2 ≤ L1S1 / L1S2 ≤ 7 facilitates collecting light at large angles, thereby increasing the field of view.

[0104] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: TTL / H ≤ 6, where TTL is the distance on the optical axis from the center of the first side surface of the first lens element to the imaging plane of the optical lens, and H is the image height corresponding to the maximum field of view of the optical lens. More specifically, TTL and H may further satisfy TTL / H ≤ 5. Meeting TTL / H ≤ 6 effectively reduces the overall optical length of the lens assembly, thereby meeting the requirements of miniaturized design.

[0105] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: (FOV × F) / H ≥ 40, where FOV is the maximum field of view 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 of the optical lens. More specifically, FOV, F, and H may further satisfy (FOV × F) / H ≥ 60. Satisfying (FOV × F) / H ≥ 40 allows the lens to simultaneously achieve both telephoto and wide field of view.

[0106] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: FOV / H ≥ 30, where FOV is the maximum field of view (FOV) of the optical lens and H is the image height corresponding to the maximum field of view (H) of the optical lens. More specifically, FOV and H may further satisfy FOV / H ≥ 35. Meeting FOV / H ≥ 30 facilitates achieving a wide field of view and wide angles.

[0107] In exemplary embodiments, the optical lens according to the present application may satisfy the following relationship: F / FNO ≥ 1, where F is the total effective focal length of the optical lens and FNO is the F-number of the optical lens. More specifically, F and FNO may further satisfy F / FNO ≥ 1.1. Meeting F / FNO ≥ 1 enables the lens to have a large aperture.

[0108] In an exemplary embodiment, the optical lens according to the present application may satisfy the following: arctan(1 / K(L1S2))≥50, where arctan(1 / K(L1S2)) is the aperture angle of the second side of the first lens element at the maximum field of view. More specifically, arctan(1 / K(L1S2)) may further satisfy arctan(1 / K(L1S2))≥60. When arctan(1 / K(L1S2))≥50 is satisfied, the aperture angle of the second side of the first lens element is larger, which facilitates rapid focusing of wide-angle peripheral light entering through the first lens element, thereby improving image quality.

[0109] In an exemplary embodiment, the optical lens according to the present application may satisfy the following: -50≤(L1S2-L2S1) / (L1S2+L2S1)≤1, where L1S2 is the central curvature radius of the second side surface of the first lens, and L2S1 is the central curvature radius of the first side surface of the second lens. More specifically, L1S2 and L2S1 may further satisfy -35≤(L1S2-L2S1) / (L1S2+L2S1)≤-10. Satisfying -50≤(L1S2-L2S1) / (L1S2+L2S1)≤1 can correct the aberrations of the optical system and ensure that when the light emitted from the first lens is incident on the first side surface of the second lens, the incident light is relatively smooth, thereby reducing the tolerance sensitivity of the optical system.

[0110] In exemplary embodiments, the optical lens according to the present application may satisfy the following condition: |F2 / F| ≤ 35, where F2 is the effective focal length of the second lens element and F is the total effective focal length of the optical lens. More specifically, F2 and F may further satisfy |F2 / F| ≤ 30. Meeting |F2 / F| ≤ 35 facilitates correcting aberrations and distortion in the optical imaging system while reducing its overall length and ensuring system miniaturization.

[0111] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: |F4 / F| ≤ 7, where F4 is the effective focal length of the fourth lens element, and F is the total effective focal length of the optical lens. More specifically, F4 and F may further satisfy |F4 / F| ≤ 6. When |F4 / F| ≤ 7 is satisfied, the short focal length of the fourth lens element, the final lens element, helps collect light and ensures sufficient light transmission.

[0112] In an exemplary embodiment, the optical lens according to the present application may satisfy the following condition: |F / L1S1| ≥ 0.05, where F is the total effective focal length of the optical lens, and L1S1 is the central radius of curvature of the first side surface of the first lens element. More specifically, F and L1S1 may further satisfy |F / L1S1| ≥ 0.1. Meeting |F / L1S1| ≥ 0.05 helps to moderate the change in the refraction angle of incident light, avoiding excessive aberrations caused by excessive refraction changes, facilitates the manufacture of the first lens element, and reduces tolerance sensitivity.

[0113] In an exemplary embodiment, the optical lens according to the present application may satisfy: FNO ≤ 1.8, where FNO is the F-number of the optical lens. More specifically, FNO may further satisfy FNO ≤ 1.6. Meeting FNO ≤ 1.8 allows for a wider aperture, allowing more light to enter the lens and improving overall image brightness.

[0114] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: BFL / TTL ≥ 0.05, where BFL is the distance on the optical axis from the center of the second side surface of the fourth lens element to the imaging plane of the optical lens, and TTL is the distance on the optical axis from the center of the first side surface of the first lens element to the imaging plane of the optical lens. More specifically, BFL and TTL may further satisfy BFL / TTL ≥ 0.06. Meeting BFL / TTL ≥ 0.05 not only achieves miniaturization but also reduces back focal length, facilitating module assembly.

[0115] In an exemplary embodiment, the optical lens according to the present application may satisfy the following relationship: T34 / TTL ≤ 0.02, where T34 is the distance on the optical axis from the center of the second side surface of the third lens element to the center of the first side surface of the fourth lens element, and TTL is the distance on the optical axis from the center of the first side surface of the first lens element to the imaging plane of the optical lens element. More specifically, T34 and TTL may further satisfy T34 / TTL ≤ 0.009. Meeting T34 / TTL ≤ 0.02 facilitates smooth light transition and improves relative illumination of the lens.

[0116] In an exemplary embodiment, the optical lens according to the present application may satisfy the following: -10≤(L2S1+L2S2) / (L2S1-L2S2)≤-1, wherein L2S1 is the central curvature radius of the first side surface of the second lens, and L2S2 is the central curvature radius of the second side surface of the second lens. More specifically, L2S1 and L2S2 may further satisfy the following: -9≤(L2S1+L2S2) / (L2S1-L2S2)≤-1.5. Satisfying -10≤(L2S1+L2S2) / (L2S1-L2S2)≤-1 allows the centering coefficient of the second lens to be reasonably set (facilitating clamping during processing), which is beneficial for processing, facilitates a smooth transition of peripheral light, and helps reduce lens sensitivity.

[0117] In an exemplary embodiment, the optical lens according to the present application may satisfy the following relationship: D / H / θ ≤ 3, where D is the maximum clear aperture of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, and θ is the arc value corresponding to the maximum field of view of the optical lens. More specifically, D, H, and θ may further satisfy D / H / θ ≤ 2. Meeting D / H / θ ≤ 3 allows for a smaller front port diameter, facilitating lens miniaturization.

[0118] In an exemplary embodiment, the optical lens according to the present application may satisfy the following relationship: TTL / F ≤ 15, where TTL is the distance from the center of the first side surface of the first lens element to the imaging plane of the optical lens on the optical axis, and F is the total effective focal length of the optical lens. More specifically, TTL and F may further satisfy TTL / F ≤ 13. Meeting TTL / F ≤ 15 effectively limits the length of the lens, enabling miniaturization.

[0119] In an exemplary embodiment, the optical lens according to the present application may satisfy the following relationship: T12 / TTL ≤ 0.35, where T12 is the distance on the optical axis from the center of the second side surface of the first lens to the center of the first side surface of the second lens, and TTL is the distance on the optical axis from the center of the first side surface of the first lens to the imaging plane of the optical lens. More specifically, T12 and TTL may further satisfy T12 / TTL ≤ 0.3. When T12 / TTL ≤ 0.35 is met, the distance between the first and second lenses is reduced, resulting in a smooth light transition near the aperture, which is beneficial for improving image quality.

[0120] In exemplary embodiments, the optical lens according to the present application may further include an aperture disposed between the second and third lenses. This aperture facilitates the effective convergence of light entering the optical system, thereby reducing the aperture of the optical system. In the embodiments of the present application, the aperture may be disposed near the second side surface of the second lens, near the first side surface of the third lens, or near the center between the second and third lenses. However, it should be noted that the aperture positions disclosed herein are merely exemplary and non-limiting; in alternative embodiments, the aperture may be disposed in other locations as needed.

[0121] In an exemplary embodiment, as needed, the optical lens of the present application may further include a filter disposed between the protective glass and the imaging surface to filter light with different wavelengths and prevent damage to the second side element (e.g., chip) of the optical lens.

[0122] In an exemplary embodiment, the first lens may be a spherical lens; the second lens may be a spherical lens; the third lens may be a spherical lens; and the fourth lens may be an aspherical lens. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on the resolution 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 changes continuously from the center of the lens to the periphery. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery, an aspherical lens has a better curvature radius characteristic and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens. The setting of the aspherical lens helps to correct system aberrations and improve resolution.

[0123] According to the above-mentioned embodiment of the present application, the optical lens has at least one beneficial effect of low temperature drift, low ghost energy, high relative illumination, high resolution (million-level), miniaturization, large field of view (FOV150), and large aperture (FNO1.45) by optimizing the surface shape, size, material, and optical power of each lens. Among them, the low temperature drift characteristic is achieved by rationally selecting the lens material of the third lens and matching the corresponding focal length; the high curvature radius values ​​of the first lens and the second lens are used to reduce the central reflection, so that the reflected light path diverges, and ultimately the light spot on the image plane is larger and the energy level is lower, which can suppress ghost images; by adopting the second lens as a meniscus lens convex to the second side, and the curvature radius values ​​of the two surfaces tend to be concentric circles, the optical path difference of the light on both sides of the lens is small, the energy attenuation is low, the light path transition is smooth, and the relative illumination is improved. In addition, the present application achieves high resolution and miniaturization by adopting a four-lens structure and increasing the use of aspheric surfaces; by adopting a meniscus shape as the first lens and combining it with a meniscus lens convex to the second side surface as the second lens, the first lens collects light at a large angle and the second lens converges the light to achieve a large field of view; and by rationally matching the lens materials and shapes, a large aperture effect is achieved.

[0124] In an exemplary embodiment, the first lens, the second lens, the third lens, and the fourth lens may all be glass lenses. An optical lens made of glass can suppress the offset of the back focus of the optical lens with temperature changes, thereby improving system stability. At the same time, the use of glass material can avoid problems such as lens imaging blur caused by high and low temperature changes in the use environment and affecting the normal use of the lens. Specifically, when focusing on temperature performance and resolution quality, the first lens to the fourth lens may all be glass aspherical lenses. In applications where temperature stability requirements are lower, the first lens to the fourth lens in the optical lens may 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.

[0125] However, those skilled in the art will appreciate that the number of lenses comprising the lens can be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while the embodiments are described using four lenses as an example, the optical lens is not limited to four lenses. If desired, the optical lens may also include other numbers of lenses. Specific embodiments of optical lenses applicable to the above embodiments are further described below with reference to the accompanying drawings.

[0126] Example 1

[0127] The following reference Figure 1 An optical lens according to Example 1 of the present application is described. Figure 1A schematic structural diagram of an optical lens according to Example 1 of the present application is shown.

[0128] like Figure 1 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0129] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is concave and whose second side surface S4 is convex. The third lens L3 is a convex-convex lens with positive optical power, whose first side surface S6 is convex and whose second side surface S7 is convex. The fourth lens L4 is a convex-convex lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is convex.

[0130] The optical lens may further include a stop STO, which may be disposed between the second lens element L2 and the third lens element L3 to improve imaging quality. For example, the stop STO may be disposed between the second lens element L2 and the third lens element L3 at a position close to the first side surface S6 of the third lens element L3.

[0131] Optionally, the optical lens may further include a protective glass L5 having a first side surface S10 and a second side surface S11. The protective glass L5 may be used to protect the image sensor chip IMA located at the imaging surface and / or the image source surface. Optionally, the optical lens may further include a filter (not shown), which may be used to correct color deviation. When the optical lens is used for imaging, light from the object passes through each surface S1 to S11 in sequence and is ultimately imaged on the imaging surface; when the optical lens is used for projection, light from the image source surface passes through each surface S11 to S1 in sequence and is ultimately projected onto the target object (not shown).

[0132] Table 1 shows the curvature radius R, thickness / distance d (it should be understood that the thickness / distance d in the row where S1 is located is the center thickness d1 of the first lens L1, the thickness / distance d in the row where S2 is located is the spacing distance d2 between the first lens L1 and the second lens L2, and so on), refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 1.

[0133]

[0134] Table 1

[0135] In Example 1, the first side surface S8 and the second side surface S9 of the fourth lens L4 may both be aspherical surfaces. The surface shape x of each aspherical lens may be defined by, but not limited to, the following aspherical surface formula:

[0136]

[0137] Where x is the distance vector from the vertex of the aspheric surface 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 radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient for the i-th order of the aspheric surface. Table 2 below lists the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspheric mirror surface S8 and S9 in Example 1.

[0138] Face number k A4 A6 A8 A10 A12 A14 A16 S8 -14.9979 2.4974E-02 -7.8103E-03 1.2226E-03 -3.2509E-05 -1.1786E-05 -3.7396E-06 6.2567E-07 S9 -202.5892 -6.5062E-03 7.3564E-03 -2.6844E-03 4.9054E-04 2.6630E-05 -2.3304E-05 2.4904E-06

[0139] Table 2

[0140] Example 2

[0141] The following reference Figure 2 The optical lens according to Example 2 of the present application is described. In this embodiment and the following embodiments, some descriptions similar to those in Example 1 will be omitted for the sake of brevity. Figure 2 A schematic structural diagram of an optical lens according to Example 2 of the present application is shown.

[0142] like Figure 2 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0143] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is concave and whose second side surface S4 is convex. The third lens L3 is a convex-convex lens with positive optical power, whose first side surface S6 is convex and whose second side surface S7 is convex. The fourth lens L4 is a convex-convex lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is convex.

[0144] The optical lens may further include a stop STO, which may be disposed between the second lens element L2 and the third lens element L3 to improve imaging quality. For example, the stop STO may be disposed between the second lens element L2 and the third lens element L3 at a position close to the first side surface S6 of the third lens element L3.

[0145] Optionally, the optical lens may further include a protective glass L5 having a first side surface S10 and a second side surface S11. The protective glass L5 may be used to protect the image sensor chip IMA located at the imaging surface and / or the image source surface. Optionally, the optical lens may further include a filter (not shown), which may be used to correct color deviation. When the optical lens is used for imaging, light from the object passes through each surface S1 to S11 in sequence and is ultimately imaged on the imaging surface; when the optical lens is used for projection, light from the image source surface passes through each surface S11 to S1 in sequence and is ultimately projected onto the target object (not shown).

[0146] 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 coefficient of each aspheric mirror surface that can be used in Example 2, wherein the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0147]

[0148]

[0149] Table 3

[0150] Face number k A4 A6 A8 A10 A12 A14 A16 S8 -14.4842 2.4484E-02 -7.8263E-03 1.2821E-03 -2.7711E-05 -1.5290E-05 -3.9834E-06 7.2171E-07 S9 -202.5892 -5.9410E-03 7.6061E-03 -2.6673E-03 4.8711E-04 2.6768E-05 -2.3224E-05 2.7081E-06

[0151] Table 4

[0152] Example 3

[0153] The following reference Figure 3 An optical lens according to Example 3 of the present application is described. Figure 3 A schematic structural diagram of an optical lens according to Example 3 of the present application is shown.

[0154] like Figure 3 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0155] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is concave and whose second side surface S4 is convex. The third lens L3 is a convex-concave lens with positive optical power, whose first side surface S6 is convex and whose second side surface S7 is concave. The fourth lens L4 is a convex-convex lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is convex.

[0156] The optical lens may further include a stop STO, which may be disposed between the second lens element L2 and the third lens element L3 to improve imaging quality. For example, the stop STO may be disposed between the second lens element L2 and the third lens element L3 at a position close to the first side surface S6 of the third lens element L3.

[0157] Optionally, the optical lens may further include a protective glass L5 having a first side surface S10 and a second side surface S11. The protective glass L5 may be used to protect the image sensor chip IMA located at the imaging surface and / or the image source surface. Optionally, the optical lens may further include a filter (not shown), which may be used to correct color deviation. When the optical lens is used for imaging, light from the object passes through each surface S1 to S11 in sequence and is ultimately imaged on the imaging surface; when the optical lens is used for projection, light from the image source surface passes through each surface S11 to S1 in sequence and is ultimately projected onto the target object (not shown).

[0158] 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 coefficient of each aspheric mirror surface that can be used in Example 3, wherein the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0159]

[0160]

[0161] Table 5

[0162] Face number k A4 A6 A8 A10 A12 A14 A16 S8 -12.9970 2.4353E-02 -8.0937E-03 1.2183E-03 -3.1325E-05 -1.5040E-05 -6.5956E-06 8.9818E-07 S9 -202.5892 -3.0375E-03 7.4186E-03 -2.7282E-03 4.4328E-04 2.7946E-05 -2.3788E-05 3.0992E-06

[0163] Table 6

[0164] Example 4

[0165] The following reference Figure 4 An optical lens according to Example 4 of the present application is described. Figure 4 A schematic structural diagram of an optical lens according to Example 4 of the present application is shown.

[0166] like Figure 4 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0167] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is concave and whose second side surface S4 is convex. The third lens L3 is a convex-concave lens with positive optical power, whose first side surface S6 is convex and whose second side surface S7 is concave. The fourth lens L4 is a convex-convex lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is convex.

[0168] The optical lens may further include a stop STO, which may be disposed between the second lens element L2 and the third lens element L3 to improve imaging quality. For example, the stop STO may be disposed between the second lens element L2 and the third lens element L3 at a position close to the first side surface S6 of the third lens element L3.

[0169] Optionally, the optical lens may further include a protective glass L5 having a first side surface S10 and a second side surface S11. The protective glass L5 may be used to protect the image sensor chip IMA located at the imaging surface and / or the image source surface. Optionally, the optical lens may further include a filter (not shown), which may be used to correct color deviation. When the optical lens is used for imaging, light from the object passes through each surface S1 to S11 in sequence and is ultimately imaged on the imaging surface; when the optical lens is used for projection, light from the image source surface passes through each surface S11 to S1 in sequence and is ultimately projected onto the target object (not shown).

[0170] 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 high-order coefficient of each aspheric mirror surface that can be used in Example 4, wherein the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0171]

[0172]

[0173] Table 7

[0174] Face number k A4 A6 A8 A10 A12 A14 A16 S8 -12.5635 2.3991E-02 -8.2833E-03 1.1714E-03 -3.6331E-05 -1.8396E-05 -6.6358E-06 9.9095E-07 S9 -202.5892 -3.9497E-03 7.6459E-03 -2.7389E-03 4.6208E-04 2.2975E-05 -2.4630E-05 2.9556E-06

[0175] Table 8

[0176] Example 5

[0177] The following reference Figure 5 An optical lens according to Example 5 of the present application is described. Figure 5 A structural schematic diagram of an optical lens according to Example 5 of the present application is shown.

[0178] like Figure 5As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0179] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is concave and whose second side surface S4 is convex. The third lens L3 is a convex-concave lens with positive optical power, whose first side surface S6 is convex and whose second side surface S7 is concave. The fourth lens L4 is a convex-concave lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is concave.

[0180] The optical lens may further include a stop STO, which may be disposed between the second lens element L2 and the third lens element L3 to improve imaging quality. For example, the stop STO may be disposed between the second lens element L2 and the third lens element L3 at a position close to the first side surface S6 of the third lens element L3.

[0181] Optionally, the optical lens may further include a protective glass L5 having a first side surface S10 and a second side surface S11. The protective glass L5 may be used to protect the image sensor chip IMA located at the imaging surface and / or the image source surface. Optionally, the optical lens may further include a filter (not shown), which may be used to correct color deviation. When the optical lens is used for imaging, light from the object passes through each surface S1 to S11 in sequence and is ultimately imaged on the imaging surface; when the optical lens is used for projection, light from the image source surface passes through each surface S11 to S1 in sequence and is ultimately projected onto the target object (not shown).

[0182] 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 coefficient of each aspheric mirror surface that can be used in Example 5, wherein the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0183]

[0184] Table 9

[0185] Face number k A4 A6 A8 A10 A12 A14 A16 S8 -25.8627 1.9546E-02 -7.4737E-03 1.0458E-03 1.7764E-04 -9.8238E-05 1.3710E-05 -3.1717E-07 S9 -148.0701 9.2026E-03 7.6711E-04 -3.6738E-04 2.0171E-05 3.9859E-05 -1.8177E-05 2.9203E-06

[0186] Table 10

[0187] Example 6

[0188] The following reference Figure 6 An optical lens according to Example 6 of the present application is described. Figure 6 A structural schematic diagram of an optical lens according to Example 6 of the present application is shown.

[0189] like Figure 6 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the first side to the second side along the optical axis.

[0190] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is concave and whose second side surface S4 is convex. The third lens L3 is a convex-concave lens with positive optical power, whose first side surface S6 is convex and whose second side surface S7 is concave. The fourth lens L4 is a convex-concave lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is concave.

[0191] The optical lens may further include a stop STO, which may be disposed between the second lens element L2 and the third lens element L3 to improve imaging quality. For example, the stop STO may be disposed between the second lens element L2 and the third lens element L3 at a position close to the first side surface S6 of the third lens element L3.

[0192] Optionally, the optical lens may further include a protective glass L5 having a first side surface S10 and a second side surface S11. The protective glass L5 may be used to protect the image sensor chip IMA located at the imaging surface and / or the image source surface. Optionally, the optical lens may further include a filter (not shown), which may be used to correct color deviation. When the optical lens is used for imaging, light from the object passes through each surface S1 to S11 in sequence and is ultimately imaged on the imaging surface; when the optical lens is used for projection, light from the image source surface passes through each surface S11 to S1 in sequence and is ultimately projected onto the target object (not shown).

[0193] 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 coefficient of each aspheric mirror surface that can be used in Example 6, wherein the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0194]

[0195] Table 11

[0196] Face number k A4 A6 A8 A10 A12 A14 A16 S8 -24.7070 1.9712E-02 -7.4748E-03 1.0402E-03 1.6068E-04 -1.0791E-04 1.2547E-05 -3.4446E-07 S9 -148.0701 1.2217E-02 9.4381E-04 -3.9745E-04 -1.7280E-06 3.3126E-05 -1.9329E-05 3.3446E-06

[0197] Table 12

[0198] In summary, Examples 1 to 6 respectively satisfy the relationships shown in Table 13 below. In Table 13, the units of D, H, L1S1, L1S2, L2S1, L2S2, F, dn, dm, BFL, TTL, TL, T12, T34, F1, F2, F3, and F4 are millimeters (mm), the units of FOV and arctan (1 / K (L1S2)) are degrees (°), and the unit of θ is radians.

[0199]

[0200]

[0201] Table 13

[0202] The present application also provides an electronic device, which may include an optical lens according to the above-described embodiment of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The electronic device may be a standalone electronic device such as a range detection camera, or an imaging module integrated into a range detection device. Furthermore, the electronic device may be a standalone imaging device such as an onboard camera, or an imaging module integrated into a driver assistance system.

[0203] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that: The optical lens comprises, in sequence from the first side to the second side along the optical axis: a first lens having negative optical power, wherein the first side surface is convex and the second side surface is concave; a second lens having negative optical power, wherein the first side surface is concave and the second side surface is convex; a third lens element having positive optical power, the first side of which is convex; and a fourth lens element having positive optical power and a convex first side surface; The number of lenses having optical power in the optical lens is four; A central curvature radius L2S1 of the first side surface of the second lens and a central curvature radius L2S2 of the second side surface of the second lens satisfy: -10≤(L2S1+L2S2) / (L2S1-L2S2)≤-1; A central curvature radius L1S1 of the first side surface of the first lens and a central curvature radius L1S2 of the second side surface of the first lens satisfy: 2≤L1S1 / L1S2≤7; A distance T34 from the center of the second side surface of the third lens to the center of the first side surface of the fourth lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following conditions: T34 / TTL≤0.

02.

2. The optical lens according to claim 1, wherein: The second side surface of the third lens is a convex surface.

3. The optical lens according to claim 1, wherein: The second side surface of the third lens is concave.

4. The optical lens according to claim 1, wherein: The second side surface of the fourth lens is a convex surface.

5. The optical lens according to claim 1, wherein: The second side surface of the fourth lens is concave.

6. The optical lens according to claim 1, wherein: The optical lens further includes a stop disposed between the second lens and the third lens.

7. The optical lens according to claim 1, wherein: The second side surface of the fourth lens has at least one inflection point.

8. The optical lens according to claim 1, wherein: The fourth lens has an aspherical surface.

9. The optical lens according to any one of claims 1 to 8, wherein: The effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy the following: 2.792≤|F3 / F|≤6.

10. The optical lens according to any one of claims 1 to 8, characterized in that: A center thickness dn of a lens with the largest center thickness in the optical lens on the optical axis and a center thickness dm of a lens with the smallest center thickness in the optical lens on the optical axis satisfy the following: 2.706≤dn / dm≤7.

11. The optical lens according to any one of claims 1 to 8, wherein: The temperature deviation coefficient dn3 / dt of the third lens satisfies: -4.12×10 -6 ≥dn3 / dt≥-8×10 -6 .

12. The optical lens according to any one of claims 1 to 8, wherein: A distance TTL from a center of the first side surface of the first lens to an imaging surface of the optical lens on the optical axis satisfies the following: 0.656≤L1S1 / TTL≤1.

5.

13. The optical lens according to any one of claims 1 to 8, characterized in that: A distance TTL from a center of the first side surface of the first lens to an imaging surface of the optical lens on the optical axis satisfies the following: 0.188≤|L2S1 / TTL|≤0.

5.

14. The optical lens according to any one of claims 1 to 8, characterized in that: The effective focal length F3 of the third lens and the effective focal length F4 of the fourth lens satisfy the following: 0.611≤|F3 / F4|≤1.

28.

15. The optical lens according to any one of claims 1 to 8, wherein: Satisfies: 0.2≤L2S1 / L2S2≤5.

16. The optical lens according to any one of claims 1 to 8, characterized in that: A distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis, a maximum field of view FOV of the optical lens, and an image height H corresponding to the maximum field of view of the optical lens satisfy the following conditions: 0.022≤TTL / H / FOV≤0.

06.

17. The optical lens according to any one of claims 1 to 8, characterized in that: A distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis and an image height H corresponding to the maximum field angle of the optical lens satisfy the following: 3.136≤TTL / H≤6.

18. The optical lens according to any one of claims 1 to 8, 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 the following conditions: 62.324≥(FOV×F) / H≥40.

19. The optical lens according to any one of claims 1 to 8, wherein: 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 the following: 36.323≥FOV / H≥30.

20. The optical lens according to any one of claims 1 to 8, wherein: The total effective focal length F of the optical lens and the F number FNO of the optical lens satisfy: 1.175≥F / FNO≥1.

21. The optical lens according to any one of claims 1 to 8, wherein: The opening angle arctan(1 / K(L1S2)) at the maximum field angle of the second side surface of the first lens satisfies: 65.341≥arctan(1 / K(L1S2))≥50.

22. The optical lens according to any one of claims 1 to 8, wherein: Satisfies: -50≤(L1S2-L2S1) / (L1S2+L2S1)≤1.

23. The optical lens according to any one of claims 1 to 8, wherein: The effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy the following: 5.6169≤|F2 / F|≤35.

24. The optical lens according to any one of claims 1 to 8, wherein: The effective focal length F4 of the fourth lens and the total effective focal length F of the optical lens satisfy the following: 2.3814≤|F4 / F|≤7.

25. The optical lens according to any one of claims 1 to 8, characterized in that: The total effective focal length F of the optical lens satisfies: 0.186≥|F / L1S1|≥0.

05.

26. The optical lens according to any one of claims 1 to 8, characterized in that: The F number FNO of the optical lens satisfies: 1.470≤FNO≤1.

8.

27. The optical lens according to any one of claims 1 to 8, wherein: A distance BFL from the center of the second side surface of the fourth lens to the imaging plane of the optical lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging plane of the optical lens on the optical axis satisfy: 0.260≥BFL / TTL≥0.

05.

28. The optical lens according to any one of claims 1 to 8, characterized in that: A distance T34 from the center of the second side surface of the third lens to the center of the first side surface of the fourth lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following conditions: 0.0059≤T34 / TTL≤0.

02.

29. The optical lens according to any one of claims 1 to 8, wherein: The maximum clear aperture D of the first side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the radian value θ corresponding to the maximum field angle of the optical lens satisfy the following conditions: 0.670≤D / H / θ≤3.

30. The optical lens according to any one of claims 1 to 8, wherein: A distance TTL from the center of the first side surface of the first lens to the imaging plane of the optical lens on the optical axis and a total effective focal length F of the optical lens satisfy the following conditions: 7.333≤TTL / F≤15.

31. The optical lens according to any one of claims 1 to 8, wherein: A distance T12 from the center of the second side surface of the first lens to the center of the first side surface of the second lens on the optical axis and a distance TTL from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following conditions: 0.218≤T12 / TTL≤0.

35.

32. An electronic device, characterized in that: The invention comprises an optical lens according to any one of claims 1 to 31 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

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