Optical lens

Abstract

The present application discloses an optical lens, which includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in order from the object side to the image side along the optical axis. The first lens has positive optical power, and its object side surface is convex, and its image side surface is concave; the second lens and the third lens are cemented to form a first cemented lens; the fourth lens has positive optical power, and its object side surface and image side surface are both convex; and the fifth lens and the sixth lens are cemented to form a second cemented lens.

Description

Technical Field

[0001] The present application relates to an optical lens, and more specifically, the present application relates to an optical lens including six lenses. Background Art

[0002] In recent years, the market of advanced driver assistance systems (ADAS) has developed rapidly. As an important component of ADAS, automotive lenses have increasingly higher performance requirements, which are mainly reflected in the following aspects:

[0003] 1. The requirements for the resolution of vehicle-mounted lenses are getting higher and higher, especially for front-view lenses. From the original megapixels, they are now being popularized towards 2M, and even pursuing higher resolution clarity of 4M and 8M;

[0004] 2. As the resolution increases, the chip size increases, resulting in an increase in the size of the lens. However, for some lenses that are used in limited installation locations, it is particularly important to achieve miniaturization of the lens. For example, for a car-mounted front-view lens that needs to be installed on the inside of the windshield, a lens that is too large will interfere with the perspective effect of the windshield. The total length of the existing lens is about 45mm, which is not advantageous from the perspective of miniaturization. Therefore, a special lens design is required to meet the demand for small-size lenses.

[0005] 3. In special application environments such as vehicles driving at night, there is insufficient external light, and it is necessary to increase the aperture of the lens to increase the amount of light entering, thereby improving the night vision effect of the vehicle-mounted lens. Summary of the invention

[0006] The present application provides an optical lens that can be suitable for vehicle installation and can at least overcome or partially overcome at least one of the above-mentioned defects in the prior art.

[0007] On the one hand, the present application provides such an optical lens, which may include: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in order from the object side to the image side along the optical axis. The first lens may have positive optical power, and its object side surface may be convex, and its image side surface may be concave; the second lens and the third lens are cemented to form a first cemented lens; the fourth lens may have positive optical power, and its object side surface and image side surface may both be convex; and the fifth lens and the sixth lens are cemented to form a second cemented lens.

[0008] In one embodiment, the second lens in the first cemented lens may have negative optical power, and its object side surface and image side surface may both be concave; and the third lens in the first cemented lens may have positive optical power, and its object side surface and image side surface may both be convex.

[0009] In one embodiment, the fifth lens in the second cemented lens may have positive optical power, its object side surface may be convex, and its image side surface may be concave; and the sixth lens in the second cemented lens may have negative optical power, its object side surface may be convex, and its image side surface may be concave.

[0010] In one embodiment, the first lens may be an aspheric lens. Alternatively, the first lens may be an aspheric lens made of glass.

[0011] In one embodiment, the fourth lens may be an aspherical lens.

[0012] In one embodiment, a curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis may satisfy 0.6≤R1 / (R2+d1)≤1.1.

[0013] In one embodiment, the maximum field of view FOV of the optical lens, the maximum light clearance D of the object 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 can satisfy D / h / FOV≤0.08.

[0014] In one embodiment, the total optical length TTL of the optical lens and the entire focal length value f of the optical lens may satisfy TTL / f≤3.

[0015] In one embodiment, the optical lens may further include an aperture, which may be disposed between the object side and the second lens. Alternatively, the aperture may be disposed between the object side and the first lens. Alternatively, the aperture may be disposed between the first lens and the second lens.

[0016] On the other hand, the present application provides such an optical lens, which may include: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in order from the object side to the image side along the optical axis. Among them, the first lens may have positive focal power, and its object side surface may be convex, and the image side surface may be concave; the second lens may have negative focal power, and its object side surface and image side surface may be concave; the third lens may have positive focal power, and its object side surface and image side surface may be convex; the fourth lens may have positive focal power, and its object side surface and image side surface may be convex; the fifth lens may have positive focal power, and its object side surface may be convex, and the image side surface may be concave; and the sixth lens may have negative focal power, and its object side surface may be convex, and the image side surface may be concave, wherein the total optical length TTL of the optical lens and the whole group focal length value f of the optical lens may satisfy TTL / f≤3.

[0017] In one embodiment, the second lens and the third lens may be cemented together to form a first cemented lens.

[0018] In one implementation, the fifth lens and the sixth lens may be cemented together to form a second cemented lens.

[0019] In one embodiment, the first lens may be an aspheric lens. Alternatively, the first lens may be an aspheric lens made of glass.

[0020] In one embodiment, the fourth lens may be an aspherical lens.

[0021] In one embodiment, a curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis may satisfy 0.6≤R1 / (R2+d1)≤1.1.

[0022] In one embodiment, the maximum field of view FOV of the optical lens, the maximum light clearance D of the object 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 can satisfy D / h / FOV≤0.08.

[0023] In one embodiment, the optical lens may further include an aperture, which may be disposed between the object side and the second lens. Alternatively, the aperture may be disposed between the object side and the first lens. Alternatively, the aperture may be disposed between the first lens and the second lens.

[0024] The present application adopts, for example, six lenses, and optimizes the shape of the lenses, reasonably distributes the optical focal length of each lens, and glues them together to form a glued lens, so that the optical lens has at least one beneficial effect of miniaturization, large aperture, high pixel, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0026] Figure 1 A schematic diagram showing the structure of an optical lens according to Embodiment 1 of the present application;

[0027] Figure 2 A schematic diagram showing the structure of an optical lens according to Embodiment 2 of the present application;

[0028] Figure 3 A schematic diagram showing the structure of an optical lens according to Embodiment 3 of the present application; and

[0029] Figure 4 A schematic diagram showing the structure of an optical lens according to Example 4 of the present application. DETAILED DESCRIPTION

[0030] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only 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.

[0031] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens, and the first cemented lens may also be referred to as the second cemented lens.

[0032] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0033] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface closer to the object side of each lens is called the object side surface of the lens, and the surface closer to the image side of each lens is called the image side surface of the lens.

[0034] 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 exclude 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 listed 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.

[0035] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] The features, principles and other aspects of the present application are described in detail below.

[0038] The optical lens according to the exemplary embodiment of the present application includes, for example, six lenses with optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, which are arranged in sequence from the object side to the image side along the optical axis.

[0039] The optical lens according to the exemplary embodiment of the present application 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).

[0040] According to an embodiment of the present application, the first lens may have positive focal power, and its object side surface may be convex, and its image side surface may be concave. Designing the first lens as a meniscus lens convex to the object side and having a shape close to concentric circles is conducive to collecting as much light of a large field of view as possible, allowing more light to enter the rear optical system and increase the amount of light passing through. In some embodiments, the first lens may be a glass aspherical lens to improve the resolution and help avoid the limitations of spherical concentric circle lenses in processing and manufacturing. In practical applications, considering that the environment for outdoor installation and use of vehicle-mounted lenses may be relatively harsh, configuring the object side surface of the first lens as a convex surface is also conducive to the sliding of water droplets on the object side, thereby reducing the impact of bad weather such as rain and snow on the imaging quality of the lens.

[0041] In an exemplary embodiment, a curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface, and a center thickness d1 of the first lens on the optical axis may satisfy a conditional formula of 0.6≤R1 / (R2+d1)≤1.1, and R1, R2, and d1 may further satisfy 0.75≤R1 / (R2+d1)≤1.05, for example, 0.84≤R1 / (R2+d1)≤0.93.

[0042] The second lens element may have negative optical power, and both the object-side surface and the image-side surface thereof may be concave.

[0043] The third lens element may have positive refractive power, and both the object-side surface and the image-side surface thereof may be convex.

[0044] The fourth lens may have positive focal power, and its object side and image side may be convex. The fourth lens is arranged as a biconvex lens, which is conducive to the smooth transition of the front light to the rear optical system. As known to those skilled in the art, an aspherical lens has a better curvature radius characteristic, and thus has the advantages of improving distortion aberration and improving astigmatism aberration, and can improve the imaging quality. In use, at least one of the object side and image side of the fourth lens may be arranged as an aspherical mirror surface to further improve the resolution quality of the lens.

[0045] The fifth lens element may have positive refractive power, and its object-side surface may be convex, and its image-side surface may be concave.

[0046] The sixth lens element may have negative power, and its object-side surface may be convex, and its image-side surface may be concave.

[0047] As known to those skilled in the art, discrete lenses at the turning point of light are prone to sensitivity due to processing errors and / or assembly errors, and the use of cemented lenses can effectively reduce the sensitivity of the system. The use of cemented lenses can not only effectively reduce the sensitivity of the system and shorten the overall length of the system, but also share the correction of the overall chromatic aberration and aberration of the system, and improve the resolution of the optical lens. In addition, the use of cemented lenses can facilitate the assembly of the system and effectively reduce the tolerance sensitivity problems such as tilt / eccentricity of the lens unit caused by the assembly process.

[0048] In an exemplary embodiment, the second lens and the third lens can be combined into a first cemented lens by gluing the image side surface of the second lens to the object side surface of the third lens. The first cemented lens can be designed by using a material with a high refractive index and a low Abbe number in combination with a material with a low refractive index and a high Abbe number (relative to a lens with a high refractive index and a low Abbe number). Specifically, in an exemplary embodiment, the refractive index of the second lens is higher than that of the third lens, and the Abbe number of the second lens is lower than that of the third lens. The combination of high and low refractive indices of the lens is conducive to the rapid transition of the light in front and to increasing the aperture of the aperture, so that the lens meets the night vision requirements. In addition, the combination of high and low refractive indices of the lens is also conducive to eliminating the own chromatic aberration, reducing the tolerance sensitivity, and leaving some chromatic aberration to balance the chromatic aberration of the system. Moreover, the air gap is reduced by gluing, which is conducive to shortening the total length of the system.

[0049] In an exemplary embodiment, the image side surface of the fifth lens and the object side surface of the sixth lens may be glued together to form a second glued lens. The second glued lens may be glued in a manner that a lens with positive power is in front and a lens with negative power is in the back, thereby facilitating a smoother transition of light passing through the fourth lens to the sixth lens, shortening the total length of the optical system, and reducing the diameter of the rear end of the lens or the size of the rear end. In addition, the use of glued parts is also conducive to eliminating self-chromatic aberration, reducing tolerance sensitivity, and leaving some chromatic aberration to balance the chromatic aberration of the system.

[0050] In an exemplary embodiment, a stop for limiting the light beam may be provided, for example, between the object side and the second lens to further improve the imaging quality of the lens. When the stop is provided between the first lens and the second lens, the front end diameter and front end size of the lens may be effectively reduced, while also being conducive to achieving a large aperture. Further, the stop may be provided between the object side and the first lens, and such a provision is more conducive to reducing the front end lens diameter of the lens. It should be understood that the position of the stop is not limited to the above position, and may also be provided at any other position as required.

[0051] In an exemplary embodiment, the total optical length TTL of the optical lens (i.e., the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis) and the entire set focal length value f of the optical lens may satisfy TTL / f≤3. More specifically, TTL and f may further satisfy TTL / f≤2.5, for example, 2.12≤TTL / f≤2.25. Satisfying the conditional formula TTL / f≤3 may reflect the miniaturization characteristics of the lens.

[0052] In an exemplary embodiment, the maximum field of view FOV of the optical lens, the maximum aperture D of the object 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≤0.08. More specifically, D, h, and FOV may further satisfy D / h / FOV≤0.07, for example, 0.05≤D / h / FOV≤0.06. Satisfying the conditional formula D / h / FOV≤0.08 may reflect the small front aperture of the lens.

[0053] According to the optical lens of the above-mentioned embodiment of the present application, high resolution (up to 8M pixels) can be achieved through reasonable lens shape design and material matching. Reasonable matching of lens shape and optical focal length can help reduce the total optical length of the lens and realize lens miniaturization. The use of two sets of cemented lenses can be beneficial to lens assembly, reduce tolerance sensitivity, and effectively reduce system chromatic aberration while making the overall structure of the optical system more compact. In addition, the optical lens has the performance of a large aperture, which can effectively increase the amount of light entering and improve the brightness of the image plane, thereby having a better night vision effect to meet the use requirements of the vehicle-mounted lens at night or in other special scenes with insufficient light. The optical lens can take into account the characteristics of miniaturization, large aperture, high pixels, etc., and can better meet the requirements of the application of vehicle-mounted lenses in specific scenes.

[0054] However, it should be understood by those skilled in the art that, without departing from the technical solution claimed in the present 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 six lenses are described as an example in the embodiment, the optical lens is not limited to including six lenses. If necessary, the optical lens may also include other numbers of lenses.

[0055] Specific embodiments of the optical lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0056] Example 1

[0057] The following reference Figure 1 An optical lens according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical lens according to Example 1 of the present application is shown.

[0058] like Figure 1 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 in sequence from the object side to the image side along the optical axis.

[0059] The first lens L1 is a meniscus lens with positive refractive power, whose object-side surface S1 is convex, and whose image-side surface S2 is concave. Both the object-side surface S1 and the image-side surface S2 of the first lens L1 are aspherical surfaces.

[0060] The second lens L2 is a biconcave lens with negative refractive power, and both the object-side surface S4 and the image-side surface S5 of the second lens L2 are concave surfaces, and both the object-side surface S4 and the image-side surface S5 of the second lens L2 are spherical surfaces.

[0061] The third lens L3 is a biconvex lens with positive refractive power, and both the object-side surface S5 and the image-side surface S6 of the third lens L3 are convex surfaces, and both the object-side surface S5 and the image-side surface S6 of the third lens L3 are spherical surfaces.

[0062] The fourth lens L4 is a biconvex lens with positive refractive power, and both the object-side surface S7 and the image-side surface S8 thereof are convex surfaces, and both the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are aspherical surfaces.

[0063] The fifth lens L5 is a meniscus lens with positive refractive power, whose object-side surface S9 is convex, and whose image-side surface S10 is concave. Both the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are spherical surfaces.

[0064] The sixth lens L6 is a meniscus lens with negative refractive power, whose object-side surface S10 is convex, and whose image-side surface S11 is concave. Both the object-side surface S10 and the image-side surface S11 of the sixth lens L6 are spherical surfaces.

[0065] In this embodiment, the second lens L2 and the third lens L3 are cemented together to form a first cemented lens, and the fifth lens L5 and the sixth lens L6 are cemented together to form a second cemented lens.

[0066] Optionally, the optical lens may further include a filter and / or a protective glass L7 having an object side surface S12 and an image side surface S13. The filter may be used to correct color deviation. The protective glass may be used to protect the image sensor chip located on the imaging surface IMA. Light from the object sequentially passes through each surface S1 to S13 and is finally imaged on the imaging surface IMA.

[0067] In the optical lens of this embodiment, a stop STO may be disposed between the first lens L1 and the second lens L2 to improve imaging quality.

[0068] Table 1 shows the radius of curvature R, thickness T, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 1, wherein the units of the radius of curvature R and the thickness T are both millimeters (mm).

[0069] Face number Curvature radius R Thickness T Refractive index Nd Abbe number Vd S1 15.4959 4.9860 1.81 32.00 S2 13.3889 2.8819 STO endless 3.3938 S4 -23.8787 0.9000 1.85 32.30 S5 42.0103 4.7316 1.62 54.00 S6 -13.5653 0.1500 S7 23.1403 4.0529 1.59 61.20 S8 -21.6504 0.1500 S9 9.0342 3.7397 1.50 65.00 S10 28.6906 2.2803 1.64 35.70 S11 5.9845 3.5000 S12 endless 0.9500 1.52 64.17 S13 endless 3.4969 IMA endless

[0070] Table 1

[0071] This embodiment uses six lenses as an example. By reasonably allocating the optical power and surface shape of each lens, the center thickness of each lens, and the air space between each lens, the beneficial effects of miniaturization, large aperture, high pixel, etc. can be achieved. The surface shape Z of each aspherical surface is defined by the following formula:

[0072]

[0073] Wherein, Z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the conic coefficient conic; A, B, C, D, and E are all high-order coefficients. Table 2 below shows the conic coefficient k and high-order coefficients A, B, C, D, and E that can be used for the aspheric lens surfaces S1, S2, S7, and S8 in Example 1.

[0074]

[0075]

[0076] Table 2

[0077] Table 3 below shows the maximum clear aperture D of the object side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens of Example 1, the image height h corresponding to the maximum field angle of the optical lens, the maximum field angle FOV of the optical lens, the total optical length TTL of the optical lens (i.e., the on-axis distance from the center of the object side surface S1 of the first lens L1 to the imaging surface IMA), and the entire group focal length value f of the optical lens.

[0078] parameter D(mm) h(mm) FOV(°) TTL(mm) f(mm) Numeric 16.79 9.16 31.2 35.21 16.55

[0079] Table 3

[0080] In this embodiment, the curvature radius R1 of the object-side surface S1 of the first lens L1, the curvature radius R2 of the image-side surface S2 of the first lens L1, and the center thickness d1 of the first lens L1 on the optical axis satisfy R1 / (R2+d1)=0.843; the maximum field of view FOV of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 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=0.059; and the total optical length TTL of the optical lens and the entire focal length f of the optical lens satisfy TTL / f=2.128.

[0081] Example 2

[0082] The following reference Figure 2 The optical lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 2 A schematic structural diagram of an optical lens according to Embodiment 2 of the present application is shown.

[0083] like Figure 2As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 in sequence from the object side to the image side along the optical axis.

[0084] The first lens L1 is a meniscus lens with positive refractive power, whose object-side surface S1 is convex, and whose image-side surface S2 is concave. Both the object-side surface S1 and the image-side surface S2 of the first lens L1 are aspherical surfaces.

[0085] The second lens L2 is a biconcave lens with negative refractive power, and both the object-side surface S4 and the image-side surface S5 of the second lens L2 are concave surfaces, and both the object-side surface S4 and the image-side surface S5 of the second lens L2 are spherical surfaces.

[0086] The third lens L3 is a biconvex lens with positive refractive power, and both the object-side surface S5 and the image-side surface S6 of the third lens L3 are convex surfaces, and both the object-side surface S5 and the image-side surface S6 of the third lens L3 are spherical surfaces.

[0087] The fourth lens L4 is a biconvex lens with positive refractive power, and both the object-side surface S7 and the image-side surface S8 thereof are convex surfaces, and both the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are aspherical surfaces.

[0088] The fifth lens L5 is a meniscus lens with positive refractive power, whose object-side surface S9 is convex, and whose image-side surface S10 is concave. Both the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are spherical surfaces.

[0089] The sixth lens L6 is a meniscus lens with negative refractive power, whose object-side surface S10 is convex, and whose image-side surface S11 is concave. Both the object-side surface S10 and the image-side surface S11 of the sixth lens L6 are spherical surfaces.

[0090] In this embodiment, the second lens L2 and the third lens L3 are cemented together to form a first cemented lens, and the fifth lens L5 and the sixth lens L6 are cemented together to form a second cemented lens.

[0091] Optionally, the optical lens may further include a filter and / or a protective glass L7 having an object side surface S12 and an image side surface S13. The filter may be used to correct color deviation. The protective glass may be used to protect the image sensor chip located on the imaging surface IMA. Light from the object sequentially passes through each surface S1 to S13 and is finally imaged on the imaging surface IMA.

[0092] In the optical lens of this embodiment, a stop STO may be disposed between the first lens L1 and the second lens L2 to improve imaging quality.

[0093] Table 4 below shows the radius of curvature R, thickness T, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 2, wherein the units of the radius of curvature R and the thickness T are both millimeters (mm).

[0094]

[0095]

[0096] Table 4

[0097] Table 5 below shows the cone coefficient k and the higher-order coefficients A, B, C, D and E that can be used for the aspheric lens surfaces S1, S2, S7 and S8 in Example 2, where each aspheric surface shape can be defined by formula (1) given in Example 1 above.

[0098] Face number k A B C D E S1 -1.0289 -3.3392E-05 -1.1255E-06 -8.2248E-09 -6.1424E-11 6.6353-E13 S2 -0.5664 -3.8888E-04 -1.7530E-06 -2.4985E-08 1.3835E-10 1.9454E-12 S7 -8.1736 -3.3951E-05 -8.0724E-08 1.3923E-09 -1.5267E-11 4.2385E-14 S8 0.0452 3.5933E-05 1.5786E-08 1.7594E-09 -1.0932E-11 4.3212E-14

[0099] Table 5

[0100] Table 6 below shows the maximum clear aperture D of the object side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens of Example 2, the image height h corresponding to the maximum field angle of the optical lens, the maximum field angle FOV of the optical lens, the total optical length TTL of the optical lens, and the entire group focal length value f of the optical lens.

[0101] parameter D(mm) h(mm) FOV(°) TTL(mm) f(mm) Numeric 15.50 9.04 31.2 34.73 15.44

[0102] Table 6

[0103] In this embodiment, the curvature radius R1 of the object-side surface S1 of the first lens L1, the curvature radius R2 of the image-side surface S2 of the first lens L1, and the center thickness d1 of the first lens L1 on the optical axis satisfy R1 / (R2+d1)=0.929; the maximum field of view FOV of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 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=0.055; and the total optical length TTL of the optical lens and the entire focal length f of the optical lens satisfy TTL / f=2.249.

[0104] Example 3

[0105] 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.

[0106] like Figure 3 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 in sequence from the object side to the image side along the optical axis.

[0107] The first lens L1 is a meniscus lens with positive refractive power, whose object-side surface S1 is convex, and whose image-side surface S2 is concave. Both the object-side surface S1 and the image-side surface S2 of the first lens L1 are aspherical surfaces.

[0108] The second lens L2 is a biconcave lens with negative refractive power, and both the object-side surface S4 and the image-side surface S5 of the second lens L2 are concave surfaces, and both the object-side surface S4 and the image-side surface S5 of the second lens L2 are spherical surfaces.

[0109] The third lens L3 is a biconvex lens with positive refractive power, and both the object-side surface S5 and the image-side surface S6 of the third lens L3 are convex surfaces, and both the object-side surface S5 and the image-side surface S6 of the third lens L3 are spherical surfaces.

[0110] The fourth lens L4 is a biconvex lens with positive refractive power, and both the object-side surface S7 and the image-side surface S8 thereof are convex surfaces, and both the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are aspherical surfaces.

[0111] The fifth lens L5 is a meniscus lens with positive refractive power, whose object-side surface S9 is convex, and whose image-side surface S10 is concave. Both the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are spherical surfaces.

[0112] The sixth lens L6 is a meniscus lens with negative refractive power, whose object-side surface S10 is convex, and whose image-side surface S11 is concave. Both the object-side surface S10 and the image-side surface S11 of the sixth lens L6 are spherical surfaces.

[0113] In this embodiment, the second lens L2 and the third lens L3 are cemented together to form a first cemented lens, and the fifth lens L5 and the sixth lens L6 are cemented together to form a second cemented lens.

[0114] Optionally, the optical lens may further include a filter and / or a protective glass L7 having an object side surface S12 and an image side surface S13. The filter may be used to correct color deviation. The protective glass may be used to protect the image sensor chip located on the imaging surface IMA. Light from the object sequentially passes through each surface S1 to S13 and is finally imaged on the imaging surface IMA.

[0115] In the optical lens of this embodiment, a stop STO may be disposed between the first lens L1 and the second lens L2 to improve imaging quality.

[0116] Table 7 below shows the radius of curvature R, thickness T, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 3, wherein the units of the radius of curvature R and the thickness T are both millimeters (mm).

[0117] Face number Curvature radius R Thickness T Refractive index Nd Abbe number Vd S1 12.5436 3.7869 1.81 41.00 S2 9.9300 3.4294 STO endless 1.7586 S4 -39.7055 0.9500 1.85 23.00 S5 24.4760 5.0672 1.62 57.00 S6 -17.9424 0.1500 S7 25.3715 5.4673 1.59 55.00 S8 -15.5242 0.1500 S9 9.3452 5.2608 1.50 61.00 S10 55.3539 0.9500 1.63 35.70 S11 6.0617 3.5000 S12 endless 0.9500 1.52 64.17 S13 endless 3.6102 IMA endless

[0118] Table 7

[0119] Table 8 below shows the cone coefficient k and the higher-order coefficients A, B, C, D and E that can be used for the aspheric lens surfaces S1, S2, S7 and S8 in Example 3, where each aspheric surface shape can be defined by formula (1) given in Example 1 above.

[0120] Face number k A B C D E S1 -2.9421 -2.7746E-05 -9.5168E-07 -6.1404E-09 -8.5528E-11 6.4854E-13 S2 -3.3719 -2.4279E-05 -1.4894E-06 -1.8092E-08 -8.8118E-11 3.6200E-12 S7 -0.4170 -8.6229E-05 -8.9364E-08 1.6333E-09 -1.6762E-11 4.3791E-14 S8 0.0049 8.5305E-05 1.4644E-08 1.9477E-09 -1.2161E-11 5.1340E-14

[0121] Table 8

[0122] Table 9 below shows the maximum clear aperture D of the object side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens of Example 3, the image height h corresponding to the maximum field angle of the optical lens, the maximum field angle FOV of the optical lens, the total optical length TTL of the optical lens, and the entire group focal length value f of the optical lens.

[0123] parameter D(mm) h(mm) FOV(°) TTL(mm) f(mm) Numeric 16.20 9.04 31.2 35.03 16.31

[0124] Table 9

[0125] In this embodiment, the curvature radius R1 of the object-side surface S1 of the first lens L1, the curvature radius R2 of the image-side surface S2 of the first lens L1, and the center thickness d1 of the first lens L1 on the optical axis satisfy R1 / (R2+d1)=0.914; the maximum field of view FOV of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 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=0.057; and the total optical length TTL of the optical lens and the entire focal length f of the optical lens satisfy TTL / f=2.148.

[0126] Example 4

[0127] 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.

[0128] like Figure 4 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 in sequence from the object side to the image side along the optical axis.

[0129] The first lens L1 is a meniscus lens with positive refractive power, whose object-side surface S1 is convex, and whose image-side surface S2 is concave. Both the object-side surface S1 and the image-side surface S2 of the first lens L1 are aspherical surfaces.

[0130] The second lens L2 is a biconcave lens with negative refractive power, and both the object-side surface S4 and the image-side surface S5 of the second lens L2 are concave surfaces, and both the object-side surface S4 and the image-side surface S5 of the second lens L2 are spherical surfaces.

[0131] The third lens L3 is a biconvex lens with positive refractive power, and both the object-side surface S5 and the image-side surface S6 of the third lens L3 are convex surfaces, and both the object-side surface S5 and the image-side surface S6 of the third lens L3 are spherical surfaces.

[0132] The fourth lens L4 is a biconvex lens with positive refractive power, and both the object-side surface S7 and the image-side surface S8 thereof are convex surfaces, and both the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are aspherical surfaces.

[0133] The fifth lens L5 is a meniscus lens with positive refractive power, whose object-side surface S9 is convex, and whose image-side surface S10 is concave. Both the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are spherical surfaces.

[0134] The sixth lens L6 is a meniscus lens with negative refractive power, whose object-side surface S10 is convex, and whose image-side surface S11 is concave. Both the object-side surface S10 and the image-side surface S11 of the sixth lens L6 are spherical surfaces.

[0135] In this embodiment, the second lens L2 and the third lens L3 are cemented together to form a first cemented lens, and the fifth lens L5 and the sixth lens L6 are cemented together to form a second cemented lens.

[0136] Optionally, the optical lens may further include a filter and / or a protective glass L7 having an object side surface S12 and an image side surface S13. The filter may be used to correct color deviation. The protective glass may be used to protect the image sensor chip located on the imaging surface IMA. Light from the object sequentially passes through each surface S1 to S13 and is finally imaged on the imaging surface IMA.

[0137] In the optical lens of this embodiment, a stop STO may be disposed between the first lens L1 and the second lens L2 to improve imaging quality.

[0138] Table 10 below shows the radius of curvature R, thickness T, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 4, wherein the units of the radius of curvature R and the thickness T are both millimeters (mm).

[0139] Face number Curvature radius R Thickness T Refractive index Nd Abbe number Vd S1 12.4843 3.8120 1.81 41.00 S2 10.0405 3.3900 STO endless 1.6980 S4 -36.0351 0.9500 1.85 28.30 S5 24.7750 5.0900 1.62 55.50 S6 -17.7366 0.1500 S7 25.8358 5.6200 1.59 61.20 S8 -15.3185 0.1500 S9 9.1487 5.1600 1.50 64.00 S10 47.8223 0.9500 1.63 30.70 S11 6.0200 3.5000 S12 endless 0.9500 1.52 64.17 S13 endless 4.1000 IMA endless

[0140] Table 10

[0141] Table 11 below shows the cone coefficient k and the higher-order coefficients A, B, C, D and E that can be used for the aspheric lens surfaces S1, S2, S7 and S8 in Example 4, where each aspheric surface shape can be defined by formula (1) given in the above Example 1.

[0142] Face number k A B C D E S1 -4.8739 -4.3210E-05 -9.0268E-07 -3.8833E-09 -1.1919E-10 7.5380E-13 S2 -1.3323 -1.0460E-04 -1.4299E-06 -8.5481E-09 -3.3189E-10 5.3462E-12 S7 -0.6865 -5.8408E-05 -1.0418E-07 1.9624E-09 -1.9554E-11 5.3093E-14 S8 1.4328 1.1649E-05 -2.1344E-08 2.4572E-09 -1.8437E-11 7.5619E-14

[0143] Table 11

[0144] Table 12 below shows the maximum clear aperture D of the object side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens of Example 4, the image height h corresponding to the maximum field angle of the optical lens, the maximum field angle FOV of the optical lens, the total optical length TTL of the optical lens, and the entire group focal length value f of the optical lens.

[0145] parameter D(mm) h(mm) FOV(°) TTL(mm) f(mm) Numeric 16.14 8.97 31.2 35.50 16.31

[0146] Table 12

[0147] In this embodiment, the curvature radius R1 of the object-side surface S1 of the first lens L1, the curvature radius R2 of the image-side surface S2 of the first lens L1, and the center thickness d1 of the first lens L1 on the optical axis satisfy R1 / (R2+d1)=0.901; the maximum field of view FOV of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 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=0.058; and the total optical length TTL of the optical lens and the entire focal length f of the optical lens satisfy TTL / f=2.177.

[0148] In summary, Examples 1 to 4 respectively satisfy the relationship shown in Table 13 below.

[0149] Conditional formula\Example E1 E2 E3 E4 R1 / (R2+d1) 0.843 0.929 0.914 0.901 D / h / FOV 0.059 0.055 0.057 0.058 TTL / f 2.128 2.249 2.148 2.177

[0150] Table 13

[0151] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. 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 a specific combination of the above technical features, but 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, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. The optical lens includes the following components from the object side to the image side along the optical axis: The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are characterized in that: The first lens has positive refractive power, its object side surface is convex, and its image side surface is concave; The second lens and the third lens are cemented together to form a first cemented lens, wherein the second lens has negative optical power and the third lens has positive optical power; The fourth lens has positive refractive power, and both the object side surface and the image side surface thereof are convex; The fifth lens and the sixth lens are cemented together to form a second cemented lens, wherein the fifth lens has positive focal power and the sixth lens has negative focal power; The number of lenses having optical power in the optical lens is six; The optical lens satisfies 9.900≤D / h / FOV×180°≤14.40, wherein FOV is the maximum field of view of the optical lens, D is the maximum aperture of the object side of the first lens corresponding to the maximum field of view, and h is the image height corresponding to the maximum field of view; A curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis satisfy 0.6≤R1 / (R2+d1)≤1.

1.

2. The optical lens according to claim 1, wherein: The object side surface and the image side surface of the second lens in the first cemented lens are both concave surfaces; and The object side surface and the image side surface of the third lens in the first cemented lens are both convex surfaces.

3. The optical lens according to claim 1, wherein: The object side surface of the fifth lens in the second cemented lens is convex, and the image side surface is concave; and The object side surface of the sixth lens in the second cemented lens is convex, and the image side surface is concave.

4. The optical lens according to claim 1, characterized in that: The first lens is an aspherical lens.

5. The optical lens according to claim 1, characterized in that: The fourth lens is an aspherical lens.

6. The optical lens according to any one of claims 1 to 5, characterized in that: The total optical length TTL of the optical lens and the entire focal length value f of the optical lens satisfy TTL / f≤3.

7. The optical lens according to any one of claims 1 to 5, characterized in that: The optical lens further includes a stop, and the stop is arranged between the object side and the second lens.

8. The optical lens according to claim 7, characterized in that: The aperture stop is disposed between the object side and the first lens.

9. The optical lens according to claim 7, characterized in that: The aperture is disposed between the first lens and the second lens.

10. The optical lens according to any one of claims 1 to 5, characterized in that: The maximum field of view FOV of the optical lens, the maximum light clearance D of the object side surface of the first lens corresponding to the maximum field of view, and the image height h corresponding to the maximum field of view satisfy 9.900≤D / h / FOV×180°≤10.

620.

11. The optical lens according to any one of claims 1 to 5, characterized in that: A curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis satisfy 0.843≤R1 / (R2+d1)≤1.

1.

12. The optical lens according to any one of claims 1 to 5, characterized in that: A curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis satisfy 0.843≤R1 / (R2+d1)≤0.

929.

13. The optical lens according to any one of claims 1 to 5, characterized in that: The total optical length TTL of the optical lens and the entire focal length value f of the optical lens satisfy 2.128≤TTL / f≤3.

14. The optical lens according to any one of claims 1 to 5, characterized in that: The total optical length TTL of the optical lens and the entire focal length value f of the optical lens satisfy 2.128≤TTL / f≤2.

249.

15. An optical lens includes, in order from the object side to the image side along the optical axis: The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are characterized in that: The first lens has positive refractive power, its object side surface is convex, and its image side surface is concave; The second lens has negative optical power, and both the object side surface and the image side surface thereof are concave; The third lens has positive refractive power, and both the object side surface and the image side surface thereof are convex; The fourth lens has positive refractive power, and both the object side surface and the image side surface thereof are convex; The fifth lens has positive refractive power, its object side surface is convex, and its image side surface is concave; The sixth lens has negative optical power, its object side surface is convex, and its image side surface is concave; wherein the number of lenses having optical power in the optical lens is six; The total optical length TTL of the optical lens and the focal length f of the entire set of the optical lens satisfy TTL / f≤3; The optical lens satisfies 9.900≤D / h / FOV×180°≤14.40, wherein FOV is the maximum field of view of the optical lens, D is the maximum aperture of the object side of the first lens corresponding to the maximum field of view, and h is the image height corresponding to the maximum field of view; and A curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis satisfy 0.6≤R1 / (R2+d1)≤1.

1.

16. The optical lens according to claim 15, characterized in that: The second lens and the third lens are cemented together to form a first cemented lens.

17. The optical lens according to claim 15, characterized in that: The fifth lens and the sixth lens are cemented together to form a second cemented lens.

18. The optical lens according to claim 15, characterized in that: The first lens is an aspherical lens.

19. The optical lens according to claim 15, characterized in that: The fourth lens is an aspherical lens.

20. The optical lens according to any one of claims 15 to 19, characterized in that: The optical lens further includes an aperture stop, and the aperture stop is arranged between the object side and the second lens.

21. The optical lens according to claim 20, characterized in that: The aperture stop is disposed between the object side and the first lens.

22. The optical lens according to claim 20, characterized in that: The aperture is disposed between the first lens and the second lens.

23. The optical lens according to any one of claims 15 to 19, characterized in that: The maximum field of view FOV of the optical lens, the maximum light clearance D of the object side surface of the first lens corresponding to the maximum field of view, and the image height h corresponding to the maximum field of view satisfy 9.900≤D / h / FOV×180°≤10.

620.

24. The optical lens according to any one of claims 15 to 19, characterized in that: A curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis satisfy 0.843≤R1 / (R2+d1)≤1.

1.

25. The optical lens according to any one of claims 15 to 19, characterized in that: A curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and a center thickness d1 of the first lens on the optical axis satisfy 0.843≤R1 / (R2+d1)≤0.

929.

26. The optical lens according to any one of claims 15 to 19, characterized in that: The total optical length TTL of the optical lens and the entire focal length value f of the optical lens satisfy 2.128≤TTL / f≤3.

27. The optical lens according to any one of claims 15 to 19, characterized in that: The total optical length TTL of the optical lens and the entire focal length value f of the optical lens satisfy 2.128≤TTL / f≤2.249.

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