Optical lens

Abstract

The utility model discloses an optical lens. The optical lens sequentially comprises a first lens with negative focal power from an object side to an image side along an optical axis, a second lens with negative focal power, a third lens with positive focal power and a fourth lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface and the image side surface of the third lens are concave surfaces; the object side surface and the image side surface of the fourth lens are convex surfaces; the fifth lens has positive focal power, and the object side surface and the image side surface of the fifth lens are convex surfaces; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a convex surface; the object side surface of the ninth lens is a concave surface, and the image side surface of the ninth lens is a convex surface; and the object side surface of the tenth lens is a convex surface, and the image side surface of the tenth lens is a convex surface.

Description

Technical Field

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

[0002] With the development of technology, the design of fisheye lenses has become more and more advanced. The current fisheye lenses can capture more realistic images. At present, fisheye lenses have become one of the essential products for almost all lens manufacturers. At the same time, due to the popularization and development of panoramic imaging technology, the application of fisheye lenses in the fields of VR, AR, panoramic shooting, etc. has become more and more extensive.

[0003] However, most of the current fisheye lenses on the market still have the following problems:

[0004] 1. The fisheye lenses on the market often have a large head and cannot meet the requirements of miniaturization;

[0005] 2. For the fisheye lenses that can meet the imaging quality, their apertures are often very small and cannot adapt to the darker environments at night or on rainy and cloudy days;

[0006] Therefore, in order to meet the requirements of fisheye lenses, there is an urgent need in the market for an ultra-wide-angle lens that can achieve a large field of view, a large aperture, high resolution, and infrared confocal. Utility Model Content

[0007] On the one hand, this application provides an optical lens, which sequentially includes, along the optical axis from the object side to the image side: a first lens with a negative focal power, whose object side is convex and image side is concave; a second lens with a negative focal power, whose object side is convex and image side is concave; a third lens with a negative focal power, whose object side is concave and image side is concave; a fourth lens with a positive focal power, whose object side is convex and image side is convex; a fifth lens with a positive focal power, whose object side is convex and image side is convex; a sixth lens with a positive focal power, whose object side is convex and image side is concave; a seventh lens with a positive focal power, whose object side is concave and image side is convex; an eighth lens with a positive focal power, whose object side is convex and image side is convex; a ninth lens with a negative focal power, whose object side is concave and image side is convex; and a tenth lens with a positive focal power, whose object side is convex and image side is convex.

[0008] In one embodiment, the effective focal length F1 of the first lens and the effective focal length F of the optical lens satisfy: -6.2 ≤ F1 / F ≤ -5.6.

[0009] In one embodiment, the effective focal length F2 of the second lens and the effective focal length F of the optical lens satisfy: -3.6 ≤ F2 / F ≤ -2.7.

[0010] In one embodiment, the effective focal length F3 of the third lens and the effective focal length F of the optical lens satisfy: -3.2 ≤ F3 / F ≤ -2.6.

[0011] In one embodiment, the effective focal length F4 of the fourth lens and the effective focal length F of the optical lens satisfy: 2.0 ≤ F4 / F ≤ 2.8.

[0012] In one embodiment, the combined focal length F34 of the third lens and the fourth lens and the effective focal length F of the optical lens satisfy: -17.8 ≤ F34 / F ≤ -14.0.

[0013] In one embodiment, the refractive index Nd3 of the third lens and the refractive index Nd4 of the fourth lens satisfy: 0.1 ≤ |Nd3 - Nd4| ≤ 0.3.

[0014] In one embodiment, the Abbe number Vd3 of the third lens and the Abbe number Vd4 of the fourth lens satisfy: 20 ≤ |Vd3 - Vd4| ≤ 30.

[0015] In one embodiment, the effective focal length F5 of the fifth lens and the effective focal length F of the optical lens satisfy: 6.0 ≤ F5 / F ≤ 6.8.

[0016] In one embodiment, the effective focal length F6 of the sixth lens and the effective focal length F of the optical lens satisfy: 22.0 ≤ F6 / F ≤ 28.4.

[0017] In one embodiment, the effective focal length F7 of the seventh lens and the effective focal length F of the optical lens satisfy: 8.6 ≤ F7 / F ≤ 9.9.

[0018] In one embodiment, the effective focal length F8 of the eighth lens and the effective focal length F of the optical lens satisfy: 2.2 ≤ F8 / F ≤ 2.6.

[0019] In one embodiment, the effective focal length F9 of the ninth lens and the effective focal length F of the optical lens satisfy: -3.2 ≤ F9 / F ≤ -2.7.

[0020] In one embodiment, the combined focal length F89 of the eighth lens and the ninth lens and the effective focal length F of the optical lens satisfy: 8.9 ≤ F89 / F ≤ 12.1.

[0021] In one embodiment, the refractive index Nd8 of the eighth lens and the refractive index Nd9 of the ninth lens satisfy: 0.2 ≤ |Nd8 - Nd9| ≤ 0.4.

[0022] In one embodiment, the Abbe number Vd8 of the eighth lens and the Abbe number Vd9 of the ninth lens satisfy: 45 ≤ |Vd8 - Vd9| ≤ 55.

[0023] In one embodiment, the effective focal length F10 of the tenth lens and the effective focal length F of the optical lens satisfy: 5.4 ≤ F10 / F ≤ 6.0.

[0024] In one embodiment, the combined focal length Fa of the first lens to the sixth lens and the effective focal length F of the optical lens satisfy: -19.2 ≤ Fa / F ≤ -5.4.

[0025] In one embodiment, the combined focal length Fb of the seventh lens to the tenth lens and the effective focal length F of the optical lens satisfy: 2.4 ≤ Fb / F ≤ 3.1.

[0026] In one embodiment, the combined focal length Fa of the first lens to the sixth lens and the combined focal length Fb of the seventh lens to the tenth lens satisfy: -6.8 ≤ Fa / Fb ≤ -2.0.

[0027] In one embodiment, the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0.2 ≤ CT3 / CT4 ≤ 0.7.

[0028] In one embodiment, the central thickness CT8 of the eighth lens on the optical axis and the central thickness CT9 of the ninth lens on the optical axis satisfy: 2.0 ≤ CT8 / CT9 ≤ 3.3.

[0029] In one embodiment, the effective semi-aperture D1 of the first lens and the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0.6 ≤ D1 / TTL ≤ 0.8.

[0030] In one embodiment, the optical lens further includes a diaphragm disposed between the sixth lens and the seventh lens; the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, the interval distance T6 between the sixth lens and the diaphragm on the optical axis, and the central thickness CT6 of the sixth lens on the optical axis satisfy: 15.0 ≤ TTL / (T6 + CT6) ≤ 21.6.

[0031] In one embodiment, the distance TTL 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 effective focal length F of the optical lens satisfy: 12.7 ≤ TTL / F ≤ 14.4.

[0032] In one embodiment, the distance BFL from the center of the image side surface of the tenth lens to the imaging surface of the optical lens on the optical axis and the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0.1 ≤ BFL / TTL ≤ 0.3.

[0033] On the other hand, the present application provides an electronic device. The electronic device includes an optical lens provided according to the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0034] The optical lens provided by the present application is a ten-piece ultra-wide-angle lens. By reasonably setting the optical power of each lens and the surface shape of some lenses, it is beneficial to realize the performance of the lens in the infrared state, so that the optical lens provided by the present application has at least one beneficial effect such as a large field of view, a large aperture, high resolution, infrared confocal, and no defocusing during high and low temperature processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In combination with the accompanying drawings, through the following detailed description of the embodiments, other features, objectives, and advantages of the present utility application will become more obvious. In the drawings:

[0036] Figure 1 is a schematic structural diagram of the optical lens according to Embodiment 1 of the present application;

[0037] Figure 2 is a schematic structural diagram of the optical lens according to Embodiment 2 of the present application;

[0038] Figure 3 is a schematic structural diagram of the optical lens according to Embodiment 3 of the present application; and

[0039] Figure 4 is a schematic structural diagram of the optical lens according to Embodiment 4 of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0041] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0042] In the accompanying drawings, for the sake of convenience of illustration, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only for illustration and are not drawn strictly to scale.

[0043] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging side is called the image side surface of the lens.

[0044] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including having", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features, rather than an individual element in the list. In addition, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0045] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formalized sense unless expressly so defined herein.

[0046] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0047] The features, principles and other aspects of the present application are described in detail below.

[0048] In an exemplary embodiment, the optical lens includes, for example, ten lenses having optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens. These ten lenses are arranged in sequence along the optical axis from the object side to the image side, and there may be a spacing distance between any two adjacent lenses among the first lens to the tenth lens.

[0049] In an exemplary embodiment, the third lens and the fourth lens may be glued together to form a cemented lens. More specifically, the third lens has a negative optical power, the fourth lens has a positive optical power, and the third lens and the fourth lens form a doublet lens having a negative optical power, which is beneficial to correcting chromatic aberration.

[0050] In an exemplary embodiment, the eighth lens and the ninth lens may be glued together to form a cemented lens. The eighth lens has a positive optical power, and the ninth lens has a negative optical power. The eighth lens and the ninth lens form a doublet lens with a positive optical power, which can well further correct chromatic aberration and effectively reduce the influence brought by tolerances.

[0051] In an exemplary embodiment, the optical lens may further include a diaphragm for restricting the light beam to further improve the imaging quality of the optical lens. Exemplarily, the diaphragm may be disposed between the sixth lens and the seventh lens. The diaphragm is beneficial to converging the light rays entering the optical lens, shortening the total length of the optical system, reducing the maximum clear aperture of the optical lens, facilitating miniaturization and reducing the assembly sensitivity of the system. However, it should be noted that the position of the diaphragm disclosed herein is only an example and not a limitation; in an alternative embodiment, the diaphragm may also be disposed at other positions according to actual needs.

[0052] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the image side of the tenth lens. Optionally, the photosensitive element disposed on the image side of the tenth lens may be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS).

[0053] In an exemplary embodiment, the first lens has a negative optical power, its object side is convex, and its image side is concave. This setting of the first lens is beneficial to collecting light rays in a large field of view, reducing the incident angle of the light rays entering the rear-end lens, and at the same time being beneficial to reducing the large aberration caused by the large field angle.

[0054] In an exemplary embodiment, the second lens has a negative optical power, its object side is convex, and its image side is concave. This setting of the second lens is beneficial to sharing the negative optical power of the first lens and can deflect the incident light rays at a large angle again, which is beneficial to the ray tracing of the rear-end light rays.

[0055] In an exemplary embodiment, the third lens has a negative optical power, its object side is concave, and its image side is concave. This setting of the third lens can achieve the deflection of the incident light rays to achieve the effect of balancing the incident angle. At the same time, this shape can increase the clear aperture and adjust the light ray trend, so as to improve the peripheral brightness.

[0056] In an exemplary embodiment, the fourth lens has a positive optical power, its object side is convex, and its image side is convex. This setting of the fourth lens can effectively compensate for the negative optical power of the third lens, making it more conducive to the correction of chromatic aberration.

[0057] In an exemplary embodiment, the fifth lens has a positive focal power, and both its object side and image side are convex. This setting of the fifth lens is conducive to the smooth transition of light in the system, making it more beneficial for light ray tracing. At the same time, it can compensate for the negative focal power of the first lens and the second lens, reduce the sensitivity to tolerances, and improve the resolution.

[0058] In an exemplary embodiment, the sixth lens has a positive focal power, its object side is convex, and its image side is concave. This setting of the sixth lens can effectively suppress the incident light entering the rear group, which is beneficial for light ray tracing. At the same time, it is also conducive to the correction of field curvature.

[0059] In an exemplary embodiment, the seventh lens has a positive focal power, its object side is concave, and its image side is convex. This setting of the seventh lens can compensate for the front group of lenses (i.e., the first lens to the sixth lens), which is beneficial for the correction of aberrations. At the same time, it can also adjust the light ray trend, thereby reducing the sensitivity to tolerances.

[0060] In an exemplary embodiment, the eighth lens has a positive focal power, and both its object side and image side are convex. This setting of the eighth lens is beneficial for more light in the edge field of view to enter the rear-end lens, thereby increasing the illuminance of the lens. At the same time, it is also beneficial for the optimization of aberrations.

[0061] In an exemplary embodiment, the ninth lens has a negative focal power, its object side is concave, and its image side is convex. This setting of the ninth lens is beneficial for the light rays emerging from the eighth lens to enter the rear-end lens more smoothly. At the same time, it can well compensate for the eighth lens to achieve aberration compensation.

[0062] In an exemplary embodiment, the tenth lens has a positive focal power, its object side is convex, and its image side is convex. This setting of the tenth lens is beneficial for reducing the angle of the chief ray to match the CRA curve of the chip. At the same time, this lens is also beneficial for correcting the negative focal power of the first lens, the second lens, and the third lens, which is beneficial for the correction of aberrations in the edge field of view, can better meet the imaging quality requirements, is also beneficial for balancing the focal power of the cemented lens, and is beneficial for realizing the performance of the lens in the infrared state.

[0063] In an exemplary embodiment, the optical lens according to the present application can satisfy: -6.2 ≤ F1 / F ≤ -5.6, where F1 is the effective focal length of the first lens and F is the effective focal length of the optical lens. Satisfying -6.2 ≤ F1 / F ≤ -5.6, reasonably setting the effective focal length of the first lens is beneficial for collecting light in a large field of view while ensuring the processability of the first lens, and is beneficial for controlling aberrations at a large field of view to meet the imaging requirements of a large field of view lens.

[0064] In an exemplary embodiment, the optical lens according to the present application can satisfy: -3.6 ≤ F2 / F ≤ -2.7, where F2 is the effective focal length of the second lens and F is the effective focal length of the optical lens. Satisfying -3.6 ≤ F2 / F ≤ -2.7 and reasonably setting the effective focal length of the second lens is beneficial for sharing the negative optical power of the first lens and refracting the light rays with a relatively large incident angle after passing through the first lens again, which is beneficial for the light rays to enter the rear lens group more smoothly.

[0065] In an exemplary embodiment, the optical lens according to the present application can satisfy: -3.2 ≤ F3 / F ≤ -2.6, where F3 is the effective focal length of the third lens and F is the effective focal length of the optical lens. Satisfying -3.2 ≤ F3 / F ≤ -2.6 and reasonably setting the effective focal length of the third lens is beneficial for the expansion of the light beam, so as to obtain a wider light passing field of view, thereby improving the relative illumination of the marginal field of view.

[0066] In an exemplary embodiment, the optical lens according to the present application can satisfy: 2.0 ≤ F4 / F ≤ 2.8, where F4 is the effective focal length of the fourth lens and F is the effective focal length of the optical lens. Satisfying 2.0 ≤ F4 / F ≤ 2.8 and reasonably setting the effective focal length of the fourth lens can effectively compensate for the negative optical power of the third lens, which is more conducive to the correction of chromatic aberration and can also make the light rays after passing through the third lens continue to propagate in the current direction.

[0067] In an exemplary embodiment, the optical lens according to the present application can satisfy: -17.8 ≤ F34 / F ≤ -14.0, where F34 is the combined focal length of the third lens and the fourth lens and F is the effective focal length of the optical lens. The third lens and the fourth lens can be glued together to form a cemented lens and satisfy -17.8 ≤ F34 / F ≤ -14.0. By gluing two glass lenses with one negative and one positive optical power, the compensation of each other's optical power can be realized to eliminate the aberration generated by each other.

[0068] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.1 ≤ |Nd3 - Nd4| ≤ 0.3, where Nd3 is the refractive index of the third lens and Nd4 is the refractive index of the fourth lens. The third lens and the fourth lens can be glued together to form a cemented lens and satisfy 0.1 ≤ |Nd3 - Nd4| ≤ 0.3. By optimizing the combination of the refractive indices of the third lens and the fourth lens, the chromatic aberration of the optical system can be effectively corrected, thereby improving the resolution ability of the system.

[0069] In an exemplary embodiment, the optical lens according to the present application may satisfy: 20≤|Vd3-Vd4|≤30, wherein Vd3 is the Abbe number of the third lens, and Vd4 is the Abbe number of the fourth lens. The third lens and the fourth lens may be cemented to form a cemented lens, and satisfy 20≤|Vd3-Vd4|≤30. By optimizing the Abbe numbers of the third lens and the fourth lens, the chromatic aberration of the optical system may be effectively corrected, thereby improving the resolution of the system.

[0070] In an exemplary embodiment, the optical lens according to the present application may satisfy: 6.0≤F5 / F≤6.8, where F5 is the effective focal length of the fifth lens, and F is the effective focal length of the optical lens. Satisfying 6.0≤F5 / F≤6.8 and reasonably setting the effective focal length of the fifth lens is conducive to compensating for the negative focal power of the first lens and the second lens, and at the same time, it can also reduce the sensitivity of tolerance, thereby improving the imaging quality. On the other hand, the lens is also conducive to the smooth transition of light in the system, making it more conducive to tracking.

[0071] In an exemplary embodiment, the optical lens according to the present application may satisfy: 22.0≤F6 / F≤28.4, where F6 is the effective focal length of the sixth lens, and F is the effective focal length of the optical lens. Satisfying 22.0≤F6 / F≤28.4 and reasonably setting the effective focal length of the sixth lens is not only conducive to the correction of the field curvature of the optical system, but also can reduce the incident light entering the rear group, which is more conducive to the tracing of light.

[0072] In an exemplary embodiment, the optical lens according to the present application may satisfy: 8.6≤F7 / F≤9.9, where F7 is the effective focal length of the seventh lens, and F is the effective focal length of the optical lens. Satisfying 8.6≤F7 / F≤9.9 and reasonably setting the effective focal length of the seventh lens is conducive to compensating for the negative focal power in the front lens group (i.e., the first lens to the sixth lens), thereby achieving aberration correction, while also reducing the sensitivity of tolerance.

[0073] In an exemplary embodiment, the optical lens according to the present application may satisfy: 2.2≤F8 / F≤2.6, where F8 is the effective focal length of the eighth lens, and F is the effective focal length of the optical lens. Satisfying 2.2≤F8 / F≤2.6 enables the eighth lens to have an appropriate positive focal power, which is conducive to more light from the edge field of view entering the rear lens, making the light path entering the system from the front smoother, optimizing aberrations, and improving resolution.

[0074] In an exemplary embodiment, the optical lens according to the present application may satisfy: -3.2 ≤ F9 / F ≤ -2.7, where F9 is the effective focal length of the ninth lens and F is the effective focal length of the optical lens. Satisfying -3.2 ≤ F9 / F ≤ -2.7 enables the ninth lens to have an appropriate negative optical power, which is beneficial for the light rays after the eighth lens to enter the rear lens more smoothly, and has a good compensation effect on the eighth lens. At the same time, it can correct aberrations.

[0075] In an exemplary embodiment, the optical lens according to the present application may satisfy: 8.9 ≤ F89 / F ≤ 12.1, where F89 is the combined focal length of the eighth lens and the ninth lens, and F is the effective focal length of the optical lens. The eighth lens and the ninth lens can be glued together to form a cemented lens and satisfy 8.9 ≤ F89 / F ≤ 12.1. By matching two lenses with positive and negative optical powers, the aberrations generated by each other can be offset. Moreover, when the eighth lens and the ninth lens are arranged as a positive-negative cemented lens and paired with a glass material, not only can the compensation of each other's optical powers be achieved, but also the chromatic aberration can be further corrected, and the sensitivity to tolerances can be reduced.

[0076] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.2 ≤ |Nd8 - Nd9| ≤ 0.4, where Nd8 is the refractive index of the eighth lens and Nd9 is the refractive index of the ninth lens. The eighth lens and the ninth lens can be glued together to form a cemented lens and satisfy 0.2 ≤ |Nd8 - Nd9| ≤ 0.4. By optimizing the combination of the refractive indices of the eighth lens and the ninth lens, the chromatic aberration of the optical system can be effectively corrected, thereby improving the resolution ability of the system.

[0077] In an exemplary embodiment, the optical lens according to the present application may satisfy: 45 ≤ |Vd8 - Vd9| ≤ 55, where Vd8 is the Abbe number of the eighth lens and Vd9 is the Abbe number of the ninth lens. The eighth lens and the ninth lens can be glued together to form a cemented lens and satisfy 45 ≤ |Vd8 - Vd9| ≤ 55. By optimizing the combination of the Abbe numbers of the eighth lens and the ninth lens, the chromatic aberration of the optical system can be effectively corrected, thereby improving the resolution ability of the system.

[0078] In an exemplary embodiment, the optical lens according to the present application may satisfy: 5.4 ≤ F10 / F ≤ 6.0, where F10 is the effective focal length of the tenth lens and F is the effective focal length of the optical lens. Satisfying 5.4 ≤ F10 / F ≤ 6.0 is beneficial for reducing the main ray angle to match the chip CRA curve. At the same time, this lens is also beneficial for correcting the negative optical powers of the first lens, the second lens, and the third lens, beneficial for correcting the off-axis field aberrations, and can better meet the imaging quality requirements; it is also beneficial for balancing the optical powers of the cemented lenses, and at the same time beneficial for realizing the performance of the lens in the infrared state and achieving infrared confocal.

[0079] In an exemplary embodiment, the optical lens according to the present application can satisfy: -19.2 ≤ Fa / F ≤ -5.4, where Fa is the combined focal length of the first lens to the sixth lens, and F is the effective focal length of the optical lens. Reasonably controlling the combined focal length of the first lens to the sixth lens is beneficial to gently converge the front light rays to near the optical axis, having a good effect on correcting large-angle distortion, and can also better converge the off-axis wide-beam aberration and field curvature, playing a positive role in improving the edge image quality.

[0080] In an exemplary embodiment, the optical lens according to the present application can satisfy: 2.4 ≤ Fb / F ≤ 3.1, where Fb is the combined focal length of the seventh lens to the tenth lens, and F is the effective focal length of the optical lens. Reasonably controlling the combined focal length of the seventh lens to the tenth lens is beneficial to correcting the field curvature generated by the first lens to the sixth lens located in front of the aperture, and reducing the influence of the field curvature on the resolution.

[0081] In an exemplary embodiment, the optical lens according to the present application can satisfy: -6.8 ≤ Fa / Fb ≤ -2.0, where Fa is the combined focal length of the first lens to the sixth lens, and Fb is the combined focal length of the seventh lens to the tenth lens. Reasonably controlling the ratio of the combined focal length of the first lens to the sixth lens to the combined focal length of the seventh lens to the tenth lens is beneficial to gently converge the front light rays to near the optical axis, having a good effect on correcting large-angle distortion, and at the same time can better converge the off-axis wide-beam aberration and field curvature, playing a positive role in improving the edge image quality. In addition, it is also beneficial to correct the field curvature generated by the first lens to the sixth lens located in front of the aperture, and reduce the influence of the field curvature on the resolution.

[0082] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.2 ≤ CT3 / CT4 ≤ 0.7, where CT3 is the central thickness of the third lens on the optical axis, and CT4 is the central thickness of the fourth lens on the optical axis. Satisfying 0.2 ≤ CT3 / CT4 ≤ 0.7, by controlling the central thicknesses of the third lens and the fourth lens, it is not only beneficial to reduce the sensitivity of the lens thickness, but also beneficial to correcting the field curvature and distortion of the optical system, so that the imaging quality of the optical system is improved.

[0083] In an exemplary embodiment, the optical lens according to the present application can satisfy: 2.0 ≤ CT8 / CT9 ≤ 3.3, where CT8 is the central thickness of the eighth lens on the optical axis, and CT9 is the central thickness of the ninth lens on the optical axis. Satisfying 2.0 ≤ CT8 / CT9 ≤ 3.3, by controlling the central thicknesses of the eighth lens and the ninth lens, it is not only beneficial to reduce the sensitivity of the lens thickness, but also beneficial to correcting the field curvature and distortion of the optical system, so that the imaging quality of the optical system is improved.

[0084] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.6 ≤ D1 / TTL ≤ 0.8, where D1 is the effective semi-aperture of the first lens, and TTL is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis. Satisfying 0.6 ≤ D1 / TTL ≤ 0.8, by controlling the head aperture and the total length of the lens, the optical system can be made more compact.

[0085] In an exemplary embodiment, the optical lens according to the present application can satisfy: 15.0 ≤ TTL / (T6 + CT6) ≤ 21.6, where TTL is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis, T6 is the distance between the sixth lens and the aperture on the optical axis, and CT6 is the central thickness of the sixth lens on the optical axis. Satisfying 15.0 ≤ TTL / (T6 + CT6) ≤ 21.6, by reasonably controlling the distance between the sixth lens and the aperture and the central thickness of the sixth lens, the incident light near the aperture can be effectively controlled, making it more conducive to ray tracing. At the same time, it is also convenient for the correction of field curvature, further improving the imaging quality.

[0086] In an exemplary embodiment, the optical lens according to the present application can satisfy: 12.7 ≤ TTL / F ≤ 14.4, where TTL is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis, and F is the effective focal length of the optical lens. Satisfying 12.7 ≤ TTL / F ≤ 14.4, by reasonably controlling the ratio of the total length TTL of the optical system to F, it is beneficial to shorten the total length of the lens and avoid problems such as poor comprehensive performance of the lens due to too small a TTL / F ratio, so as to improve the compatibility of the lens use.

[0087] In an exemplary embodiment, the optical lens according to the present application can satisfy: 0.1 ≤ BFL / TTL ≤ 0.3, where BFL is the distance from the center of the image side of the tenth lens to the imaging surface of the optical lens on the optical axis, and TTL is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis. Satisfying 0.1 ≤ BFL / TTL ≤ 0.3, by controlling the ratio of the optical back focal length to the optical total length, it is possible to avoid interference between the lens and the chip due to insufficient back focal length, affecting the imaging quality of the overall lens.

[0088] In an exemplary embodiment, the optical lens of the present application can use glass materials. Exemplarily, the first lens to the tenth lens can all use glass lenses. Using 10 glass lenses is beneficial to improving the reliability of the optical system, balancing the high and low temperature performance of the optical lens, and achieving high imaging quality in the range of -40°C to +80°C.

[0089] Optionally, in an exemplary embodiment, as needed, the optical lens of the present application may further include a filter and / or a protective glass disposed between the tenth lens and the imaging surface to filter light rays with different wavelengths and prevent damage to the image-side elements (e.g., chips) of the optical lens.

[0090] In an exemplary embodiment, the first lens to the tenth lens may be spherical lenses or aspherical lenses. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on reflecting the imaging quality, the number of aspherical lenses can be increased, and even all lenses can be aspherical lenses. The characteristic of an aspherical lens is that the curvature continuously changes from the center to the periphery of the lens. Different from a spherical lens with a constant curvature from the center to the periphery, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality of the lens. Optionally, the object side and the image side of the first lens to the tenth lens are both spherical mirror surfaces.

[0091] In an exemplary embodiment, the imaging target surface of the optical lens according to the present application can reach 1 / 1.8", enabling the resolution of the optical system to be as high as over 8MP to meet high-standard imaging requirements.

[0092] In an exemplary embodiment, the aperture number Fno of the optical lens according to the present application is 2.03. While enabling the optical lens to have a large aperture characteristic, it can also improve the light flux, thereby achieving a better night vision effect.

[0093] In an exemplary embodiment, the CRA (chief ray angle) of the optical lens according to the present application can satisfy: CRA ≤ 13.2°, which can be adapted to multiple large target surface image sensors, and has a wide application prospect and high market competitiveness.

[0094] In an exemplary embodiment, the field of view FOV of the optical lens according to the present application can reach 180°, which can meet the applications of the optical system in different scenarios to enhance market competitiveness.

[0095] In an exemplary embodiment, the optical lens according to the present application can meet the imaging performance of the lens in the infrared state and achieve infrared confocal.

[0096] The optical lens according to the above-described embodiment of the present application may employ multiple lenses, such as the ten lenses described above. By reasonably allocating optical parameters such as the optical power, surface shape, central thickness of each lens, and the on-axis spacing between each lens, it is possible to achieve at least one of a large field of view (FOV = 180°), a large aperture (Fno = 2.03), high resolution, infrared confocal, and no defocusing during high and low temperature processes (clear imaging at -40°C to +80°C).

[0097] The optical lens according to the above-described embodiment of the present application may employ multiple lenses, such as the ten lenses described above. However, those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of lenses constituting the lens can be changed to obtain the various results and advantages described in this specification. For example, although the ten-lens example is described in the embodiment, the optical lens is not limited to including ten lenses. If necessary, the optical lens may also include other numbers of lenses. The following further describes specific embodiments of the optical lens applicable to the above-described embodiment with reference to the accompanying drawings.

[0098] Example 1

[0099] The following refers to Figure 1 describes the optical lens according to Embodiment 1 of the present application. Figure 1 shows a schematic structural diagram of the optical lens according to Embodiment 1 of the present application.

[0100] As Figure 1 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10 along the optical axis from the object side to the image side. Among them, the third lens L3 and the fourth lens L4 form a cemented lens, and the eighth lens L8 and the ninth lens L9 form a cemented lens.

[0101] The first lens L1 has a negative optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface.

[0102] The second lens L2 has a negative optical power, its object side surface S3 is a convex surface, and its image side surface S4 is a concave surface.

[0103] The third lens L3 has a negative optical power, its object side surface S5 is a concave surface, and its image side surface S6 is a concave surface.

[0104] The fourth lens L4 has a positive optical power, its object side surface S6 is a convex surface, and its image side surface S7 is a convex surface.

[0105] The fifth lens L5 has a positive optical power, its object side surface S8 is a convex surface, and its image side surface S9 is a convex surface.

[0106] The sixth lens L6 has a positive optical power. Its object side S11 is convex, and its image side S12 is concave.

[0107] The seventh lens L7 has a positive optical power. Its object side S14 is concave, and its image side S15 is convex.

[0108] The eighth lens L8 has a positive optical power. Its object side S16 is convex, and its image side S17 is convex.

[0109] The ninth lens L9 has a negative optical power. Its object side S17 is concave, and its image side S18 is convex.

[0110] The tenth lens L10 has a positive optical power. Its object side S19 is convex, and its image side S20 is convex.

[0111] The optical lens may further include a stop STO, and the stop STO may be disposed between the sixth lens L6 and the seventh lens L7.

[0112] Optionally, the optical lens may further include a filter CG having an object side S21 and an image side S22 and / or a protective glass (not shown) having an object side and an image side. The filter CG and / or the protective glass can be used to correct color deviation, and the filter CG and / or the protective glass can also be used to protect the image sensing chip located at the imaging surface IMA. The light from the object sequentially passes through the surfaces S1 to S22 and finally forms an image on the imaging surface IMA.

[0113] Table 1 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens of the optical lens of Example 1, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0114]

[0115] Table 1

[0116] Example 2

[0117] The following refers to 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 those in Embodiment 1 will be omitted. Figure 2 The structural schematic diagram of the optical lens according to Embodiment 2 of the present application is shown.

[0118] As Figure 2As shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10 along the optical axis from the object side to the image side. Among them, the third lens L3 and the fourth lens L4 form a cemented lens, and the eighth lens L8 and the ninth lens L9 form a cemented lens.

[0119] The first lens L1 has a negative optical power. Its object side surface S1 is convex, and its image side surface S2 is concave.

[0120] The second lens L2 has a negative optical power. Its object side surface S3 is convex, and its image side surface S4 is concave.

[0121] The third lens L3 has a negative optical power. Its object side surface S5 is concave, and its image side surface S6 is concave.

[0122] The fourth lens L4 has a positive optical power. Its object side surface S6 is convex, and its image side surface S7 is convex.

[0123] The fifth lens L5 has a positive optical power. Its object side surface S8 is convex, and its image side surface S9 is convex.

[0124] The sixth lens L6 has a positive optical power. Its object side surface S11 is convex, and its image side surface S12 is concave.

[0125] The seventh lens L7 has a positive optical power. Its object side surface S14 is concave, and its image side surface S15 is convex.

[0126] The eighth lens L8 has a positive optical power. Its object side surface S16 is convex, and its image side surface S17 is convex.

[0127] The ninth lens L9 has a negative optical power. Its object side surface S17 is concave, and its image side surface S18 is convex.

[0128] The tenth lens L10 has a positive optical power. Its object side surface S19 is convex, and its image side surface S20 is convex.

[0129] The optical lens may further include a diaphragm STO, and the diaphragm STO may be disposed between the sixth lens L6 and the seventh lens L7.

[0130] Optionally, the optical lens may further include a filter CG having an object side surface S21 and an image side surface S22 and / or a protective glass (not shown) having an object side and an image side. The filter CG and / or the protective glass can be used to correct color deviation, and the filter CG and / or the protective glass can also be used to protect the image sensing chip located at the imaging surface IMA. The light from the object sequentially passes through the surfaces S1 to S22 and finally forms an image on the imaging surface IMA.

[0131] Table 2 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens of the optical lens of Example 2, where the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0132]

[0133]

[0134] Table 2

[0135] Example 3

[0136] The following refers to Figure 3 an optical lens according to Embodiment 3 of the present application is described. Figure 3 Fig. shows a schematic structural diagram of the optical lens according to Embodiment 3 of the present application.

[0137] As Figure 3 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10 along the optical axis from the object side to the image side. Among them, the third lens L3 and the fourth lens L4 form a cemented lens, and the eighth lens L8 and the ninth lens L9 form a cemented lens.

[0138] The first lens L1 has a negative optical power, its object side S1 is a convex surface, and its image side S2 is a concave surface.

[0139] The second lens L2 has a negative optical power, its object side S3 is a convex surface, and its image side S4 is a concave surface.

[0140] The third lens L3 has a negative optical power, its object side S5 is a concave surface, and its image side S6 is a concave surface.

[0141] The fourth lens L4 has a positive optical power, its object side S6 is a convex surface, and its image side S7 is a convex surface.

[0142] The fifth lens L5 has a positive optical power, its object side S8 is a convex surface, and its image side S9 is a convex surface.

[0143] The sixth lens L6 has a positive optical power, its object side S11 is a convex surface, and its image side S12 is a concave surface.

[0144] The seventh lens L7 has a positive optical power, its object side S14 is a concave surface, and its image side S15 is a convex surface.

[0145] The eighth lens L8 has a positive optical power, its object side S16 is a convex surface, and its image side S17 is a convex surface.

[0146] The ninth lens L9 has a negative optical power, its object side S17 is concave, and its image side S18 is convex.

[0147] The tenth lens L10 has a positive optical power, its object side S19 is convex, and its image side S20 is convex.

[0148] The optical lens may further include a diaphragm STO, and the diaphragm STO may be disposed between the sixth lens L6 and the seventh lens L7.

[0149] Optionally, the optical lens may further include a filter CG having an object side S21 and an image side S22 and / or a protective glass (not shown) having an object side and an image side. The filter CG and / or the protective glass can be used to correct color deviation, and the filter CG and / or the protective glass can also be used to protect the image sensing chip located at the imaging surface IMA. The light from the object sequentially passes through the surfaces S1 to S22 and finally forms an image on the imaging surface IMA.

[0150] Table 3 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens of the optical lens of Example 3, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0151]

[0152]

[0153] Table 3

[0154] Example 4

[0155] The following refers to Figure 4 describes an optical lens according to Embodiment 4 of the present application. Figure 4 shows a schematic structural diagram of an optical lens according to Embodiment 4 of the present application.

[0156] As Figure 4 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10 along the optical axis from the object side to the image side. Among them, the third lens L3 and the fourth lens L4 form a cemented lens, and the eighth lens L8 and the ninth lens L9 form a cemented lens.

[0157] The first lens L1 has a negative optical power, its object side S1 is convex, and its image side S2 is concave.

[0158] The second lens L2 has a negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0159] The third lens L3 has a negative optical power, its object side S5 is concave, and its image side S6 is concave.

[0160] The fourth lens L4 has a positive optical power, its object side S6 is convex, and its image side S7 is convex.

[0161] The fifth lens L5 has a positive optical power, its object side S8 is convex, and its image side S9 is convex.

[0162] The sixth lens L6 has a positive optical power, its object side S11 is convex, and its image side S12 is concave.

[0163] The seventh lens L7 has a positive optical power, its object side S14 is concave, and its image side S15 is convex.

[0164] The eighth lens L8 has a positive optical power, its object side S16 is convex, and its image side S17 is convex.

[0165] The ninth lens L9 has a negative optical power, its object side S17 is concave, and its image side S18 is convex.

[0166] The tenth lens L10 has a positive optical power, its object side S19 is convex, and its image side S20 is convex.

[0167] The optical lens may further include a diaphragm STO, and the diaphragm STO may be disposed between the sixth lens L6 and the seventh lens L7.

[0168] Optionally, the optical lens may further include a filter CG having an object side S21 and an image side S22 and / or a protective glass (not shown) having an object side and an image side. The filter CG and / or the protective glass can be used to correct color deviation, and the filter CG and / or the protective glass can also be used to protect the image sensing chip located at the imaging surface IMA. The light from the object sequentially passes through the surfaces S1 to S22 and finally forms an image on the imaging surface IMA.

[0169] Table 4 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens of the optical lens of Embodiment 4, where the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0170]

[0171] Table 4

[0172] In summary, Embodiments 1 to 4 respectively satisfy the relationships shown in Table 5 below.

[0173]

[0174]

[0175] Table 5

[0176] The present application also provides an electronic device, which may include an optical lens according to the above embodiments of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0177] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principle. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. An optical lens, characterized in that, The optical lens sequentially includes, from the object side to the image side along the optical axis: A first lens with a negative focal power, having a convex object side surface and a concave image side surface; A second lens with a negative focal power, having a convex object side surface and a concave image side surface; A third lens with a negative focal power, having a concave object side surface and a concave image side surface; A fourth lens with a positive focal power, having a convex object side surface and a convex image side surface; A fifth lens with a positive focal power, having a convex object side surface and a convex image side surface; A sixth lens with a positive focal power, having a convex object side surface and a concave image side surface; A seventh lens with a positive focal power, having a concave object side surface and a convex image side surface; An eighth lens with a positive focal power, having a convex object side surface and a convex image side surface; A ninth lens with a negative focal power, having a concave object side surface and a convex image side surface; and A tenth lens with a positive focal power, having a convex object side surface and a convex image side surface.

2. The optical lens according to claim 1, wherein the optical lens satisfies any one of the following conditional expressions: -6.2 ≤ F1 / F ≤ -5.6, -3.6 ≤ F2 / F ≤ -2.7, -3.2 ≤ F3 / F ≤ -2.6, 2.0 ≤ F4 / F ≤ 2.8, 6.0 ≤ F5 / F ≤ 6.8, 22.0 ≤ F6 / F ≤ 28.4, 8.6 ≤ F7 / F ≤ 9.9, 2.2 ≤ F8 / F ≤ 2.6, -3.2 ≤ F9 / F ≤ -2.7, 5.4 ≤ F10 / F ≤ 6.0, wherein, F1 is the effective focal length of the first lens, F is the effective focal length of the optical lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, F9 is the effective focal length of the ninth lens, and F10 is the effective focal length of the tenth lens.

3. The optical lens according to claim 1, wherein The combined focal length F34 of the third lens and the fourth lens and the effective focal length F of the optical lens satisfy: -17.8 ≤ F34 / F ≤ -14.

0.

4. The optical lens according to claim 1, wherein the optical lens satisfies any one of the following conditional expressions: 0.1 ≤ |Nd3 - Nd4| ≤ 0.3, 20 ≤ |Vd3 - Vd4| ≤ 30, wherein, Nd3 is the refractive index of the third lens, Nd4 is the refractive index of the fourth lens, Vd3 is the Abbe number of the third lens, and Vd4 is the Abbe number of the fourth lens.

5. The optical lens according to claim 1, wherein The combined focal length F89 of the eighth lens and the ninth lens and the effective focal length F of the optical lens satisfy: 8.9 ≤ F89 / F ≤ 12.

1.

6. The optical lens according to claim 1, wherein the optical lens satisfies any one of the following conditional expressions: 0.2 ≤ |Nd8 - Nd9| ≤ 0.4, 45 ≤ |Vd8 - Vd9| ≤ 55, Wherein, Nd8 is the refractive index of the eighth lens, Nd9 is the refractive index of the ninth lens, Vd8 is the Abbe number of the eighth lens, and Vd9 is the Abbe number of the ninth lens.

7. The optical lens according to any one of claims 1-6, characterized in that the optical lens satisfies any one of the following conditional expressions: -19.2 ≤ Fa / F ≤ -5.4, 2.4 ≤ Fb / F ≤ 3.1, 6.8 ≤ Fa / Fb ≤ -2.0, wherein, Fa is the combined focal length of the first lens to the sixth lens, F is the effective focal length of the optical lens, and Fb is the combined focal length of the seventh lens to the tenth lens.

8. The optical lens according to any one of claims 1-6, characterized in that the optical lens satisfies any one of the following conditional expressions: 0.2 ≤ CT3 / CT4 ≤ 0.7, 2.0 ≤ CT8 / CT9 ≤ 3.3, 0.6 ≤ D1 / TTL ≤ 0.8, wherein, CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, CT8 is the central thickness of the eighth lens on the optical axis, CT9 is the central thickness of the ninth lens on the optical axis, D1 is the effective semi-aperture of the first lens, and TTL is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis.

9. The optical lens according to any one of claims 1-6, characterized in that the optical lens further includes a diaphragm disposed between the sixth lens and the seventh lens; the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis, the interval distance T6 between the sixth lens and the diaphragm on the optical axis, and the central thickness CT6 of the sixth lens on the optical axis satisfy: 15.0 ≤ TTL / (T6 + CT6) ≤ 21.

6.

10. The optical lens according to any one of claims 1-6, characterized in that the optical lens satisfies any one of the following conditional expressions: 12.7 ≤ TTL / F ≤ 14.4, 0.1 ≤ BFL / TTL ≤ 0.3, wherein, TTL is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis, F is the effective focal length of the optical lens, and BFL is the distance from the center of the image side of the tenth lens to the imaging surface of the optical lens on the optical axis.

Images