Optical lens

Abstract

The application discloses an optical lens which comprises, in order from the object side to the image side along the optical axis, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with refractive power, a fourth lens with refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, a seventh lens with negative refractive power, an eighth lens with positive refractive power, a ninth lens with positive refractive power, and a tenth lens with negative refractive power.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical lens. Background Technology

[0002] For telephoto lenses, the main use case is observing object details, where the object-side field of view is relatively small, thus requiring a long focal length. In addition, to be compatible with more low-light environments, such as night scenes, dusk, and rainy days, telephoto lenses need to meet the requirement of a large aperture. To meet the needs of night observation, telephoto lenses need to meet the requirement of infrared confocal focus. And to meet the need to distinguish tiny details, telephoto lenses also need to meet the requirement of high image quality.

[0003] Existing telephoto lenses suffer from several problems: 1) difficulty in achieving large apertures; 2) challenges in chromatic aberration correction and infrared confocality; and 3) difficulty in balancing large aperture and high image quality. Therefore, the market urgently needs an optical lens that can achieve at least one of the following characteristics: long focal length, large aperture, infrared confocality, and high image quality. Summary of the Invention

[0004] This application provides an optical lens having a first lens with positive optical power; a second lens with negative optical power; a third lens with optical power; a fourth lens with optical power; a fifth lens with negative optical power; a sixth lens with positive optical power; a seventh lens with negative optical power; an eighth lens with positive optical power; a ninth lens with positive optical power; and a tenth lens with negative optical power.

[0005] In one embodiment, the object-side surface of the first lens is convex and the image-side surface is concave; the object-side surface of the second lens is concave and the image-side surface is convex; the object-side surface of the third lens is convex; the image-side surface of the fourth lens is convex; the object-side surface of the fifth lens is convex and the image-side surface is concave; the object-side surface of the sixth lens is convex and the image-side surface is convex; the object-side surface of the seventh lens is concave; the object-side surface of the eighth lens is convex; the object-side surface of the ninth lens is convex; and the image-side surface of the tenth lens is concave.

[0006] In one implementation, the maximum aperture Dmax of the optical lens and the total optical length TTL of the optical lens satisfy the following condition: 0.3≤Dmax / TTL≤0.6.

[0007] In one implementation, the total optical length TTL of the optical lens and the total focal length F of the optical lens satisfy: 1.6≤TTL / F≤2.3.

[0008] In one embodiment, the total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following condition: 1.1≤F / ENPD≤1.4.

[0009] In one implementation, the back focal length (BFL) of the optical lens and the total optical length (TTL) of the optical lens satisfy the following condition: 0.1 ≤ BFL / TTL ≤ 0.3.

[0010] In one embodiment, the focal length F1 of the first lens and the total focal length F of the optical lens satisfy: 2.0≤F1 / F≤4.3.

[0011] In one embodiment, the focal length F2 of the second lens and the total focal length F of the optical lens satisfy: -2.7≤F2 / F≤-1.6.

[0012] In one embodiment, the focal length F3 of the third lens and the total focal length F of the optical lens satisfy: -3.3≤F3 / F≤1.0.

[0013] In one embodiment, the focal length F4 of the fourth lens and the total focal length F of the optical lens satisfy: -2.3≤F4 / F≤1.2.

[0014] In one embodiment, the focal length F5 of the fifth lens and the total focal length F of the optical lens satisfy: -1.2≤F5 / F≤-0.6.

[0015] In one embodiment, the focal length F6 of the sixth lens and the total focal length F of the optical lens satisfy the condition: 0.4≤F6 / F≤0.7.

[0016] In one embodiment, the focal length F7 of the seventh lens and the total focal length F of the optical lens satisfy: -1.0≤F7 / F≤-0.3.

[0017] In one embodiment, the focal length F8 of the eighth lens and the total focal length F of the optical lens satisfy: 0.5≤F8 / F≤1.1.

[0018] In one embodiment, the focal length F9 of the ninth lens and the total focal length F of the optical lens satisfy: 0.2≤F9 / F≤1.1.

[0019] In one embodiment, the focal length F10 of the tenth lens and the total focal length F of the optical lens satisfy: -0.8≤F10 / F≤-0.1.

[0020] In one embodiment, the combined focal length F34 of the third and fourth lenses satisfies the condition that 0.8 ≤ F34 / F ≤ 1.3 with respect to the total focal length F of the optical lens.

[0021] In one embodiment, the combined focal length F910 of the ninth and tenth lenses satisfies the following condition with respect to the total focal length F of the optical lens: -2.9 ≤ F910 / F ≤ -0.8.

[0022] In one embodiment, the combined focal length F34 of the third and fourth lenses and the combined focal length F567 of the fifth, sixth and seventh lenses satisfy: -1.9≤F34 / F567≤-0.1.

[0023] In one embodiment, the combined focal length FⅠ of the first to seventh lenses and the total focal length F of the optical lens satisfy: 1.7≤FⅠ / F≤6.9.

[0024] In one embodiment, the combined focal length FⅡ of the eighth to tenth lenses and the total focal length F of the optical lens satisfy: 0.4≤FⅡ / F≤2.0.

[0025] In one implementation, the Abbe number VD6 of the sixth lens satisfies: 90 ≤ VD6 ≤ 100.

[0026] In one embodiment, the refractive index ND9 of the ninth lens satisfies: 1.7≤ND9≤2.2.

[0027] In one embodiment, the optical lens further includes an eleventh lens located between the tenth lens and the imaging plane of the optical lens, wherein the eleventh lens has positive optical power.

[0028] In one embodiment, the object-side surface of the eleventh lens is convex, and the image-side surface is concave.

[0029] In one embodiment, the focal length F11 of the eleventh lens and the total focal length F of the optical lens satisfy: 1.8≤F11 / F≤3.7.

[0030] In one embodiment, the combined focal length FⅡ' of the eighth to eleventh lenses and the total focal length F of the optical lens satisfy: 0.4≤FⅡ' / F≤2.0.

[0031] The optical lens provided in this application, through optimizing the shape of each lens, the optical power, and the reasonable setting of related parameters, enables the optical lens to have at least one beneficial effect such as long focal length, large aperture, infrared confocal, and high image quality. Attached Figure Description

[0032] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram illustrating the structure of an optical lens according to Embodiment 1 of this application;

[0034] Figure 2 To illustrate the structure of the optical lens according to Embodiment 2 of this application;

[0035] Figure 3To illustrate the structure of the optical lens according to Embodiment 3 of this application;

[0036] Figure 4 To illustrate the structural schematic diagram of the optical lens according to Embodiment 4 of this application; and

[0037] Figure 5 This is a schematic diagram illustrating the structure of an optical lens according to Embodiment 5 of this application. Detailed Implementation

[0038] To facilitate understanding of this application, a more complete description of the application will be provided below with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the 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.

[0039] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0040] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0041] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 subject 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.

[0042] It should also be understood that the terms "comprising," "including," "having," "containing," 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. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0043] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] The features, principles and other aspects of this application are described in detail below.

[0046] In an exemplary embodiment, the optical lens includes, for example, ten lenses with 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 sequentially along the optical axis from the object side to the image side.

[0047] In an exemplary embodiment, the optical lens includes, for example, eleven lenses with 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, a tenth lens, and an eleventh lens. These eleven lenses are arranged sequentially along the optical axis from the object side to the image side.

[0048] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the image side of the last lens. When the optical lens includes ten lenses with optical power, the last lens is the tenth lens; when the optical lens includes eleven lenses with optical power, the last lens is the eleventh lens. Optionally, the photosensitive element disposed on the image side of the last lens may be a photocoupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device.

[0049] In an exemplary embodiment, an aperture stop may be provided between the first lens and the second lens to limit the light beam and further improve the imaging quality of the optical lens. The aperture stop helps to concentrate the light entering the optical lens, reduce the aperture of the optical lens, and decrease the assembly sensitivity of the system. In this embodiment, the aperture stop may be located near the image side of the first lens. However, it should be noted that the location of the aperture stop disclosed herein is merely an example and not a limitation; in alternative embodiments, the aperture stop may be located at other positions as needed.

[0050] In an exemplary embodiment, the third and fourth lenses can form a cemented doublet, with the image-side of the third lens cemented together with the object-side of the fourth lens. The third lens has negative optical power, and the fourth lens has positive optical power, or vice versa. The third or fourth lens in the cemented doublet, having positive optical power, can be made of a material with a higher Abbe number, which helps reduce chromatic aberration and achieve high image quality; alternatively, materials with high aberrant dispersion can be selected, which helps correct chromatic aberration and achieve infrared defocus. The third or fourth lens has a large positive optical power and a large aperture, which helps correct on-axis chromatic aberration at large apertures, achieving large apertures; the combination of materials and optical power between the third and fourth lenses corrects their own aberrations, which helps reduce tolerance sensitivity.

[0051] In an exemplary embodiment, the fifth, sixth, and seventh lenses can form a cemented triplet lens, with the image-side of the fifth lens cemented to the object-side of the sixth lens, and the image-side of the sixth lens cemented to the object-side of the seventh lens. The fifth lens can have negative optical power, the sixth lens can have positive optical power, and the seventh lens can have negative optical power. The sixth lens with positive optical power can be made of a material with a higher Abbe number, which helps reduce chromatic aberration and achieve high image quality; it can also be made of a material with high anomalous dispersion, which helps correct chromatic aberration and achieve infrared defocus. The object-side of the fifth lens and the image-side of the seventh lens have similar curvatures, and the cemented triplet lens formed by the fifth, sixth, and seventh lenses has an overall meniscus shape with relatively low optical power, which helps reduce spherical aberration. The fifth, sixth, and seventh lenses, through the combination of materials and optical power, correct their own aberrations, which helps reduce tolerance sensitivity.

[0052] In an exemplary embodiment, the ninth and tenth lenses can form a cemented doublet, with the image-side surface of the ninth lens cemented together with the object-side surface of the tenth lens. The ninth lens can have positive optical power, and the tenth lens can have negative optical power. The cemented doublet formed by the ninth and tenth lenses is close to the image plane and far from the aperture stop, which is beneficial for correcting residual off-axis aberrations. The curvature of the object-side surface of the ninth lens and the image-side surface of the tenth lens are similar, and the cemented doublet formed by the ninth and tenth lenses has an overall meniscus shape with relatively low optical power, which is beneficial for reducing spherical aberration. The ninth and tenth lenses, through the combination of materials and optical power, correct their own aberrations, which is beneficial for reducing tolerance sensitivity.

[0053] In an exemplary embodiment, the first lens may have positive optical power and bear the main optical power of the system. The first lens can collect light, so that the outgoing light from the first lens is closer to the optical axis, reducing the aperture of the rear lens and facilitating miniaturization.

[0054] In an exemplary embodiment, the image-side surface of the first lens is convex, and the image-side surface is concave. The first lens has a convex-concave meniscus shape, which causes light rays to bend towards the image plane along their path. This helps to reduce the refraction angle of the light rays, lower the incident angle of the on-axis light rays, reduce the generation of spherical aberration, and thus help to achieve high image quality.

[0055] In an exemplary embodiment, the first lens may be made of a material with a large anomalous dispersion value, which is beneficial for achieving apochromatic aberration across a wide spectrum and achieving infrared confocality; the first lens may be made of a high refractive index material, which is beneficial for increasing the positive optical power of the first lens, reducing the surface curvature, reducing the generation of aberrations, and thus benefiting the achievement of high image quality.

[0056] In an exemplary embodiment, the second lens may have negative optical power. On the one hand, a second lens with negative optical power can introduce positive spherical aberration to balance the negative spherical aberration generated by the first and fourth lenses; on the other hand, a second lens with negative optical power can smooth out the angle of the emitted light rays, which is beneficial to increasing the light height of the third and fourth lenses, correcting axial chromatic aberration, and achieving high image quality.

[0057] In an exemplary embodiment, the object-side surface of the second lens is concave, and the image-side surface is convex. The concave object-side surface of the second lens bears the main negative optical power, which expands the light rays emitted from the object-side surface of the second lens and allows the light rays to smoothly enter the image-side surface of the second lens, reducing the generation of spherical aberration on the image-side surface of the second lens, and thus contributing to high image quality.

[0058] In an exemplary embodiment, the third lens may have negative optical power and its object side is convex, which is beneficial to reduce the incident angle of on-axis light rays, reduce the generation of spherical aberration, and thus help to achieve high image quality.

[0059] In an exemplary embodiment, the third lens may have negative optical power and a convex-concave meniscus shape that curves toward the image plane, which is beneficial for correcting its own spherical aberration, reducing the generation of spherical aberration, and thus helping to achieve high image quality.

[0060] In an exemplary embodiment, the third lens and the fourth lens can form a cemented doublet, with the image-side of the third lens cemented together with the object-side of the fourth lens. The third lens has negative optical power in the cemented doublet, and works with the fourth lens to correct apochromatic and spherical aberration, which is beneficial for achieving high image quality.

[0061] In an exemplary embodiment, the third lens may have positive optical power and its object side is convex, which helps to reduce the incident angle of on-axis light rays, reduce the generation of spherical aberration, and thus help to achieve high image quality.

[0062] In an exemplary embodiment, the third lens may have positive optical power, and both its object side and image side are convex, that is, the object side and image side share the optical power, reducing surface curvature and reducing the generation of aberrations, which is beneficial to achieving high image quality.

[0063] In an exemplary embodiment, the third lens may be made of a high Abbe number material, which can reduce chromatic aberration and help achieve high image quality.

[0064] In an exemplary embodiment, the third lens can be made of a material with anomalous dispersion, which is beneficial for achieving apochromatic aberration across a wide spectrum and for achieving infrared confocal focusing.

[0065] In an exemplary embodiment, the third lens and the fourth lens can form a cemented doublet, with the image-side of the third lens cemented together with the object-side of the fourth lens. The third lens has positive optical power in the cemented doublet, and works with the fourth lens to correct apochromatic and spherical aberration, which is beneficial for achieving high image quality.

[0066] In an exemplary embodiment, the fourth lens may have positive optical power and its object side is convex, which can reduce the incident angle of on-axis light rays, reduce the generation of spherical aberration, and help to achieve high image quality.

[0067] In an exemplary embodiment, the fourth lens may have positive optical power, and both its object side and image side are convex, that is, the object side and image side share the optical power, reducing surface curvature and reducing the generation of aberrations, which is beneficial to achieving high image quality.

[0068] In an exemplary embodiment, the fourth lens may be made of a high Abbe number material, which can reduce chromatic aberration and help achieve high image quality.

[0069] In an exemplary embodiment, the fourth lens can be made of a material with anomalous dispersion, which is beneficial for achieving apochromatic aberration across a wide spectrum and for achieving infrared confocal focusing.

[0070] In an exemplary embodiment, the third lens and the fourth lens can form a cemented doublet, with the image-side surface of the third lens cemented together with the object-side surface of the fourth lens. The fourth lens has positive optical power in the cemented doublet, and works in conjunction with the third lens to correct apochromatic and spherical aberration, which is beneficial for achieving high image quality.

[0071] In an exemplary embodiment, the fourth lens may have negative optical power, introducing positive spherical aberration to balance the negative spherical aberration generated by the first and third lenses, which is beneficial for achieving high image quality.

[0072] In an exemplary embodiment, the third lens and the fourth lens can form a cemented doublet, with the image-side surface of the third lens cemented together with the object-side surface of the fourth lens. The fourth lens has negative optical power in the cemented doublet, and works in conjunction with the third lens to correct apochromatic and spherical aberration, which is beneficial for achieving high image quality.

[0073] In an exemplary embodiment, the fifth lens may have negative optical power, with its object-side surface being convex and its image-side surface being concave. This configuration of the fifth lens can reduce the incident angle of on-axis rays, reduce spherical aberration, and facilitate the achievement of high image quality.

[0074] In an exemplary embodiment, the fifth, sixth, and seventh lenses can form a cemented triplet lens, with the image-side surface of the fifth lens cemented together with the object-side surface of the sixth lens, and the image-side surface of the sixth lens cemented together with the object-side surface of the seventh lens. The fifth lens has negative optical power in the cemented triplet lens, and in conjunction with the sixth and seventh lenses, it corrects apochromatic and spherical aberration, thus contributing to high image quality.

[0075] In an exemplary embodiment, the sixth lens may have positive optical power, and both its object side and image side are convex, sharing the optical power, reducing surface curvature, reducing aberrations, and thus contributing to high image quality.

[0076] In an exemplary embodiment, the object-side surface of the sixth lens is convex, which can reduce the incident angle of on-axis light rays, reduce the generation of spherical aberration, and help achieve high image quality.

[0077] In an exemplary embodiment, the sixth lens may be made of a material with a high Abbe number to reduce chromatic aberration and thus improve image quality.

[0078] In an exemplary embodiment, the sixth lens can be made of a material with anomalous dispersion, which is beneficial for achieving apochromatic aberration across a wide spectrum and for achieving infrared confocal focalization.

[0079] In an exemplary embodiment, the fifth, sixth, and seventh lenses can form a cemented triplet lens, with the image-side surface of the fifth lens cemented together with the object-side surface of the sixth lens, and the image-side surface of the sixth lens cemented together with the object-side surface of the seventh lens. The sixth lens has positive optical power in the cemented triplet lens, and works with the fifth and seventh lenses to correct apochromatic and spherical aberration, which is beneficial for achieving high image quality.

[0080] In an exemplary embodiment, the seventh lens may have negative optical power, and both its object side and image side are concave, sharing the optical power, reducing surface curvature, reducing aberrations, and thus contributing to high image quality.

[0081] In an exemplary embodiment, the image-side surface of the seventh lens may be concave, which can reduce the incident angle of on-axis light rays, reduce the generation of spherical aberration, and help achieve high image quality.

[0082] In an exemplary embodiment, the image-side surface of the seventh lens can be convex, generating positive spherical aberration, which is beneficial for correcting system aberrations and achieving high image quality.

[0083] In an exemplary embodiment, the seventh lens may be made of a high refractive index material to increase negative optical power and reduce surface curvature, which helps to reduce aberrations and achieve high image quality.

[0084] In an exemplary embodiment, the fifth, sixth, and seventh lenses can form a cemented triplet lens, with the image-side of the fifth lens cemented together with the object-side of the sixth lens, and the image-side of the sixth lens cemented together with the object-side of the seventh lens. The seventh lens has negative optical power in the cemented triplet lens, and works with the fifth and sixth lenses to correct apochromatic and spherical aberration, which is beneficial for achieving high image quality.

[0085] In an exemplary embodiment, the eighth lens may have positive optical power, and both its object side and image side are convex, sharing the optical power, reducing surface curvature, reducing aberrations, and thus contributing to high image quality.

[0086] In an exemplary embodiment, the image-side surface of the eighth lens may be concave, which reduces the incident angle of on-axis light rays, reduces the generation of spherical aberration, and is beneficial to achieving high image quality.

[0087] In an exemplary embodiment, the eighth lens may be made of a high refractive index material to increase positive optical power, reduce surface curvature, and reduce aberrations, which is beneficial for achieving high image quality.

[0088] In an exemplary embodiment, the ninth lens may have positive optical power, and both its object side and image side are convex, sharing the optical power, reducing surface curvature, reducing aberrations, and thus contributing to high image quality.

[0089] In an exemplary embodiment, the image-side surface of the ninth lens may be concave, which reduces the incident angle of on-axis rays, reduces the generation of spherical aberration, and is beneficial to achieving high image quality.

[0090] In an exemplary embodiment, the ninth lens may be made of a high refractive index material to increase positive optical power, reduce surface curvature, and reduce aberrations, which is beneficial for achieving high image quality.

[0091] In an exemplary embodiment, the ninth lens and the tenth lens can form a cemented lens, with the image-side surface of the ninth lens cemented together with the object-side surface of the tenth lens. The ninth lens has positive optical power in the cemented doublet and, in conjunction with the tenth lens, corrects off-axis chromatic aberration, which is beneficial for achieving high image quality.

[0092] In an exemplary embodiment, the tenth lens may have negative optical power, with both its object-side and image-side surfaces being concave, sharing the optical power, reducing surface curvature, reducing aberrations, and thus contributing to high image quality.

[0093] In an exemplary embodiment, the image-side surface of the tenth lens is concave, which can reduce the incident angle of on-axis light rays, reduce the generation of spherical aberration, and help achieve high image quality.

[0094] In an exemplary embodiment, the ninth lens and the tenth lens can form a cemented lens, with the image-side surface of the ninth lens cemented together with the object-side surface of the tenth lens. The tenth lens has negative optical power in the cemented doublet, and works in conjunction with the ninth lens to correct off-axis chromatic aberration, which is beneficial for achieving high image quality.

[0095] In an exemplary embodiment, the eleventh lens may have positive optical power and a convex-concave meniscus shape that curves toward the image plane. This shape can correct its own spherical aberration, reduce the generation of spherical aberration, and help achieve high image quality.

[0096] In an exemplary embodiment, the eleventh lens is a convex-concave meniscus shape, with different optical powers for on-axis and off-axis applications, correcting the residual field curvature off-axis, which is beneficial for achieving high image quality.

[0097] In an exemplary embodiment, the optical lens according to this application satisfies: 0.3 ≤ Dmax / TTL ≤ 0.6, where Dmax is the maximum aperture of the optical lens, and TTL is the total optical length of the optical lens (i.e., the axial distance from the object-side surface of the first lens to the imaging surface of the optical lens). Satisfying 0.3 ≤ Dmax / TTL ≤ 0.6, with a given total optical length, allows for a smaller maximum aperture by controlling the maximum aperture of the optical lens, which is beneficial for miniaturization.

[0098] In an exemplary embodiment, the optical lens according to this application satisfies: 1.6 ≤ TTL / F ≤ 2.3, where TTL is the total optical length of the optical lens and F is the total focal length of the optical lens. Satisfying 1.6 ≤ TTL / F ≤ 2.3, under a certain total focal length, by controlling the total optical length, the total optical length can be made smaller, which is beneficial for miniaturization.

[0099] In an exemplary embodiment, the optical lens according to this application satisfies: 1.1 ≤ F / ENPD ≤ 1.4, where F is the total focal length of the optical lens and ENPD is the entrance pupil diameter of the optical lens. Satisfying 1.1 ≤ F / ENPD ≤ 1.4, by controlling the size of the entrance pupil diameter, allows the optical lens to have a smaller aperture value, which is beneficial for achieving a large aperture.

[0100] In an exemplary embodiment, the optical lens according to this application satisfies: 0.1 ≤ BFL / TTL ≤ 0.3, where BFL is the back focal length of the optical lens (i.e., the on-axis distance from the image-side surface of the last lens in the optical lens to the imaging plane of the optical lens), and TTL is the total optical length of the optical lens. Satisfying 0.1 ≤ BFL / TTL ≤ 0.3, while achieving miniaturization, controlling the length of the optical back focal length is beneficial for the assembly of the optical lens.

[0101] In an exemplary embodiment, the optical lens according to this application satisfies: 2.0 ≤ F1 / F ≤ 4.3, where F1 is the focal length of the first lens and F is the total focal length of the optical lens. Satisfying 2.0 ≤ F1 / F ≤ 4.3, by reasonably allocating the focal length value of the first lens, light is collected, causing the emitted light from the first lens to move closer to the optical axis, reducing the aperture of the rear lens, which is beneficial for miniaturization.

[0102] In an exemplary embodiment, the optical lens according to this application satisfies: -2.7 ≤ F2 / F ≤ -1.6, where F2 is the focal length of the second lens and F is the total focal length of the optical lens. Satisfying -2.7 ≤ F2 / F ≤ -1.6 allows the second lens to generate positive spherical aberration by rationally allocating its focal length, thus balancing the negative spherical aberration generated by the first and fourth lenses, which is beneficial for achieving high image quality. Furthermore, by giving the second lens negative optical power, the angle of the emitted light rays can be smoothed, increasing the light height of the third and fourth lenses, which is beneficial for correcting axial chromatic aberration and achieving high image quality.

[0103] In an exemplary embodiment, the optical lens according to this application satisfies: -3.3 ≤ F3 / F ≤ 1.0, where F3 is the focal length of the third lens and F is the total focal length of the optical lens. Satisfying -3.3 ≤ F3 / F ≤ 1.0, by reasonably allocating the focal length value of the third lens, and cooperating with the fourth lens to achieve correction of apochromatic and spherical aberration, is beneficial to achieving high image quality.

[0104] In an exemplary embodiment, the optical lens according to this application satisfies: -2.3≤F4 / F≤1.2, where F4 is the focal length of the fourth lens and F is the total focal length of the optical lens. Satisfying -2.3≤F4 / F≤1.2, by reasonably allocating the focal length value of the fourth lens, and cooperating with the third lens to achieve correction of apochromatic and spherical aberration, is beneficial to achieving high image quality.

[0105] In an exemplary embodiment, the optical lens according to this application satisfies: -1.2 ≤ F5 / F ≤ -0.6, where F5 is the focal length of the fifth lens and F is the total focal length of the optical lens. Satisfying -1.2 ≤ F5 / F ≤ -0.6, by reasonably allocating the focal length value of the fifth lens, allows the fifth lens to have negative optical power within the cemented lens composed of the fifth, sixth, and seventh lenses. This, combined with the sixth and seventh lenses, enables the correction of apochromatic and spherical aberration, thus contributing to high image quality.

[0106] In an exemplary embodiment, the optical lens according to this application satisfies: 0.4 ≤ F6 / F ≤ 0.7, where F6 is the focal length of the sixth lens and F is the total focal length of the optical lens. By satisfying 0.4 ≤ F6 / F ≤ 0.7 and rationally allocating the focal length value of the sixth lens, the sixth lens achieves positive optical power within the cemented lens composed of the fifth, sixth, and seventh lenses. The sixth lens can be made of a material with anomalous dispersion, thus apochromaticly correcting the system and facilitating infrared confocalization.

[0107] In an exemplary embodiment, the optical lens according to this application satisfies: -1.0 ≤ F7 / F ≤ -0.3, where F7 is the focal length of the seventh lens and F is the total focal length of the optical lens. Satisfying -1.0 ≤ F7 / F ≤ -0.3, by reasonably allocating the focal length value of the seventh lens, the seventh lens has negative optical power within the cemented triplet lens composed of the fifth, sixth, and seventh lenses. This, combined with the fifth and sixth lenses, enables the correction of apochromatic and spherical aberration, thus contributing to high image quality.

[0108] In an exemplary embodiment, the optical lens according to this application satisfies: 0.5≤F8 / F≤1.1, where F8 is the focal length of the eighth lens and F is the total focal length of the optical lens. Satisfying 0.5≤F8 / F≤1.1, by reasonably allocating the focal length value of the eighth lens, selecting a high refractive index material, increasing the positive optical power, and reducing the surface curvature, helps to reduce the generation of aberrations and achieve high image quality.

[0109] In an exemplary embodiment, the optical lens according to this application satisfies: 0.2 ≤ F9 / F ≤ 1.1, where F9 is the focal length of the ninth lens and F is the total focal length of the optical lens. Satisfying 0.2 ≤ F9 / F ≤ 1.1, by reasonably allocating the focal length value of the ninth lens, ensures that the ninth lens has positive optical power in the cemented doublet formed by the ninth and tenth lenses. Combined with the tenth lens's correction of residual chromatic aberration, this contributes to achieving high image quality.

[0110] In an exemplary embodiment, the optical lens according to this application satisfies: -0.8 ≤ F10 / F ≤ -0.1, where F10 is the focal length of the tenth lens and F is the total focal length of the optical lens. Satisfying -0.8 ≤ F10 / F ≤ -0.1, by reasonably allocating the focal length value of the tenth lens, allows the tenth lens to have negative optical power within the cemented doublet formed by the ninth and tenth lenses. This, combined with the ninth lens, enables the correction of off-axis chromatic aberration, which is beneficial for achieving high image quality.

[0111] In an exemplary embodiment, the optical lens according to this application satisfies: 1.8 ≤ F11 / F ≤ 3.7, where F11 is the focal length of the eleventh lens and F is the total focal length of the optical lens. Satisfying 1.8 ≤ F11 / F ≤ 3.7, by reasonably allocating the focal length value of the eleventh lens, enables the eleventh lens to have positive optical power, generating negative spherical aberration, correcting the residual spherical aberration of the system, and thus contributing to high image quality.

[0112] In an exemplary embodiment, the optical lens according to this application satisfies: 0.8 ≤ F34 / F ≤ 1.3, where F34 is the combined focal length of the third and fourth lenses, and F is the total focal length of the optical lens. Satisfying 0.8 ≤ F34 / F ≤ 1.3, by reasonably allocating the combined focal length of the third and fourth lenses, corrects its own chromatic aberration while minimizing the absolute value of its optical power, reducing the generation of higher-order aberrations, and thus contributing to high image quality.

[0113] In an exemplary embodiment, the optical lens according to this application satisfies: -2.9 ≤ F910 / F ≤ -0.8, where F910 is the combined focal length of the ninth and tenth lenses, and F is the total focal length of the optical lens. Satisfying -2.9 ≤ F910 / F ≤ -0.8, by reasonably allocating the combined focal length of the ninth and tenth lenses, corrects its own chromatic aberration while minimizing the absolute value of its optical power, reducing the generation of higher-order aberrations, and thus contributing to high image quality.

[0114] In an exemplary embodiment, the optical lens according to this application satisfies: -1.9 ≤ F34 / F567 ≤ -0.1, where F34 is the combined focal length of the third and fourth lenses, and F567 is the combined focal length of the fifth, sixth, and seventh lenses. By satisfying -1.9 ≤ F34 / F567 ≤ -0.1 and reasonably allocating the combined focal lengths of the third and fourth lenses and the fifth, sixth, and seventh lenses, F34 is positive and F567 is negative. The spherical aberrations produced by these two elements are complementary, which is beneficial for achieving high image quality.

[0115] In an exemplary embodiment, the optical lens according to this application satisfies: 1.7 ≤ FⅠ / F ≤ 6.9, where FⅠ is the combined focal length of the first to seventh lenses, and F is the total focal length of the optical lens. Satisfying 1.7 ≤ FⅠ / F ≤ 6.9, by reasonably allocating the combined focal length of the first to seventh lenses, shares the optical power of the front group of the lens, balances system aberrations, and is beneficial to achieving high image quality.

[0116] In an exemplary embodiment, the optical lens according to this application includes ten lenses with 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. The optical lens satisfies the following condition: 0.4 ≤ FⅡ / F ≤ 2.0, where FⅡ is the combined focal length of the eighth to tenth lenses, and F is the total focal length of the optical lens. Satisfying 0.4 ≤ FⅡ / F ≤ 2.0, by reasonably distributing the combined focal length of the eighth to tenth lenses, shares the optical power of the rear group of the lens, balances system aberrations, and is beneficial to achieving high image quality.

[0117] In an exemplary embodiment, the optical lens includes eleven lenses with 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, a tenth lens, and an eleventh lens. The optical lens satisfies the following condition: 0.4 ≤ FⅡ' / F ≤ 2.0, where FⅡ' is the combined focal length of the eighth to eleventh lenses, and F is the total focal length of the optical lens. Satisfying 0.4 ≤ FⅡ' / F ≤ 2.0, by reasonably distributing the combined focal length of the eighth to eleventh lenses, shares the optical power of the rear group of the lens, balances system aberrations, and is beneficial for achieving high image quality.

[0118] In an exemplary embodiment, the optical lens according to this application satisfies: 90≤VD6≤100, where VD6 is the Abbe number of the sixth lens. Satisfying 90≤VD6≤100, by reasonably setting the Abbe number of the sixth lens, reduces the generation of chromatic aberration, lowers the difficulty of chromatic aberration correction in the system, and facilitates the realization of infrared confocal focusing.

[0119] In an exemplary embodiment, the optical lens according to this application satisfies: 1.7≤ND9≤2.2, where ND9 is the refractive index of the ninth lens. Satisfying 1.7≤ND9≤2.2, by reasonably setting the refractive index of the ninth lens, increases the positive optical power of the ninth lens, reduces the surface curvature, and reduces the generation of aberrations, which is beneficial to achieving high image quality.

[0120] In an exemplary embodiment, the aperture number Fno of the optical lens of this application can reach 1.2.

[0121] In an exemplary embodiment, the total focal length F of the optical lens of this application can reach 50mm.

[0122] The optical lens provided in this application, by reasonably controlling the refractive index and Abbe number of each lens, helps to reduce the defocusing amount of the infrared spectrum relative to the visible spectrum, thereby realizing the infrared confocal function of the lens.

[0123] In an exemplary embodiment, the optical lens of this application may, as needed, include a filter and / or protective glass disposed between the last lens and the imaging surface to filter light of different wavelengths and prevent damage to the image-side elements (e.g., chips) of the optical lens.

[0124] In exemplary embodiments, each lens of the optical lens can be a spherical lens or an aspherical lens. This application does not specifically limit the number of spherical and aspherical lenses; when image quality is paramount, the number of aspherical lenses can be increased, or even all lenses can be aspherical. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has better curvature radius characteristics, offering advantages in improving distortion and astigmatism. Using aspherical lenses can minimize aberrations that occur during imaging, thereby improving the image quality of the lens. Optionally, the object-side and image-side surfaces of each lens in the optical lens are spherical mirror surfaces.

[0125] The optical lens according to the above embodiments of this application achieves at least one beneficial effect such as long focal length, large aperture, infrared confocal focus, and high image quality by reasonably setting the shape of each lens, optical power, and related parameters.

[0126] However, those skilled in the art will understand that the number of lenses constituting the lens can be changed to obtain the various results and advantages described in this specification without departing from the technical solutions claimed in this application. For example, although ten or eleven lenses are described as examples in the embodiments, the optical lens is not limited to including ten or eleven lenses. If necessary, the optical lens may also include other numbers of lenses. Specific embodiments of the optical lens applicable to the above embodiments are further described below with reference to the accompanying drawings.

[0127] Example 1

[0128] The following is for reference Figure 1 An optical lens according to Embodiment 1 of this application is described. Figure 1 A schematic diagram of the structure of an optical lens according to Embodiment 1 of this application is shown.

[0129] like Figure 1 As shown, the optical lens includes, in sequence from the object side to the image side, 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, a tenth lens L10, and an eleventh lens L11.

[0130] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0131] The second lens L2 has negative optical power, with its object side S4 being concave and its image side S5 being convex.

[0132] The third lens L3 has negative optical power, with its object side S6 being convex and its image side S7 being concave.

[0133] The fourth lens L4 has positive optical power, and its object side S7 is convex, while its image side S8 is convex.

[0134] The fifth lens L5 has negative optical power, with its object side S9 being convex and its image side S10 being concave.

[0135] The sixth lens L6 has positive optical power, and its object side S10 is convex, and its image side S11 is convex.

[0136] The seventh lens L7 has negative optical power, and its object side S11 is concave, and its image side S12 is concave.

[0137] The eighth lens L8 has positive optical power, and its object side S13 is convex, and its image side S14 is convex.

[0138] The ninth lens L9 has positive optical power, and its object side S15 is convex, and its image side S16 is convex.

[0139] The tenth lens L10 has negative optical power, and its object side S16 is concave, as is its image side S17.

[0140] The eleventh lens L11 has positive optical power, with its object-side surface S18 being convex and its image-side surface S19 being concave.

[0141] The third lens L3 and the fourth lens L4 form a cemented doublet lens, the fifth lens L5, the sixth lens L6 and the seventh lens L7 form a cemented triplet lens, and the ninth lens L9 and the tenth lens L10 form a cemented doublet lens.

[0142] The optical lens also includes an aperture stop STO positioned between the first lens L1 and the second lens L2.

[0143] Optionally, the optical lens may also include a filter CG having an object-side surface S20 and an image-side surface S21, and / or a protective glass (not shown) having both an object-side surface and an image-side surface. The filter CG and / or the protective glass can be used to correct color aberrations, and can also be used to protect the image sensor chip located at the imaging surface IMA. Light from the object passes sequentially through surfaces S1 to S21 and is ultimately imaged onto the imaging surface IMA.

[0144] Table 1 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens in the optical lens of Example 1, wherein the units of radius of curvature and thickness / distance are millimeters (mm).

[0145]

[0146]

[0147] Table 1

[0148] Example 2

[0149] The following is for reference Figure 2 An optical lens according to Embodiment 2 of this application is described. In this embodiment and the following embodiments, for the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted. Figure 2 A schematic diagram of the structure of an optical lens according to Embodiment 2 of this application is shown.

[0150] like Figure 2 As shown, the optical lens includes, in sequence from the object side to the image side, 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, a tenth lens L10, and an eleventh lens L11.

[0151] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0152] The second lens L2 has negative optical power, with its object side S4 being concave and its image side S5 being convex.

[0153] The third lens L3 has negative optical power, with its object side S6 being convex and its image side S7 being concave.

[0154] The fourth lens L4 has positive optical power, and its object side S7 is convex, while its image side S8 is convex.

[0155] The fifth lens L5 has negative optical power, with its object side S9 being convex and its image side S10 being concave.

[0156] The sixth lens L6 has positive optical power, and its object side S10 is convex, and its image side S11 is convex.

[0157] The seventh lens L7 has negative optical power, and its object side S11 is concave, and its image side S12 is concave.

[0158] The eighth lens L8 has positive optical power, and its object side S13 is convex, and its image side S14 is convex.

[0159] The ninth lens L9 has positive optical power, and its object side S15 is convex, and its image side S16 is convex.

[0160] The tenth lens L10 has negative optical power, and its object side S16 is concave, as is its image side S17.

[0161] The eleventh lens L11 has positive optical power, with its object-side surface S18 being convex and its image-side surface S19 being concave.

[0162] The third lens L3 and the fourth lens L4 form a cemented doublet lens, the fifth lens L5, the sixth lens L6 and the seventh lens L7 form a cemented triplet lens, and the ninth lens L9 and the tenth lens L10 form a cemented doublet lens.

[0163] The optical lens also includes an aperture stop STO positioned between the first lens L1 and the second lens L2.

[0164] Optionally, the optical lens may also include a filter CG having an object-side surface S20 and an image-side surface S21, and / or a protective glass (not shown) having both an object-side surface and an image-side surface. The filter CG and / or the protective glass can be used to correct color aberrations, and can also be used to protect the image sensor chip located at the imaging surface IMA. Light from the object passes sequentially through surfaces S1 to S21 and is ultimately imaged onto the imaging surface IMA.

[0165] Table 2 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens in the optical lens of Example 2, wherein the units of radius of curvature and thickness / distance are millimeters (mm).

[0166]

[0167] Table 2

[0168] Example 3

[0169] The following is for reference Figure 3 An optical lens according to Embodiment 3 of this application is described. Figure 3 A schematic diagram of the structure of an optical lens according to Embodiment 3 of this application is shown.

[0170] like Figure 3 As shown, the optical lens includes, in sequence from the object side to the image side, 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, a tenth lens L10, and an eleventh lens L11.

[0171] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0172] The second lens L2 has negative optical power, with its object side S4 being concave and its image side S5 being convex.

[0173] The third lens L3 has negative optical power, with its object side S6 being convex and its image side S7 being concave.

[0174] The fourth lens L4 has positive optical power, and its object side S7 is convex, while its image side S8 is convex.

[0175] The fifth lens L5 has negative optical power, with its object side S9 being convex and its image side S10 being concave.

[0176] The sixth lens L6 has positive optical power, and its object side S10 is convex, and its image side S11 is convex.

[0177] The seventh lens L7 has negative optical power, and its object side S11 is concave, and its image side S12 is concave.

[0178] The eighth lens L8 has positive optical power, and its object side S13 is convex, and its image side S14 is convex.

[0179] The ninth lens L9 has positive optical power, and its object side S15 is convex, and its image side S16 is convex.

[0180] The tenth lens L10 has negative optical power, and its object side S16 is concave, as is its image side S17.

[0181] The eleventh lens L11 has positive optical power, with its object-side surface S18 being convex and its image-side surface S19 being concave.

[0182] The third lens L3 and the fourth lens L4 form a cemented doublet lens, the fifth lens L5, the sixth lens L6 and the seventh lens L7 form a cemented triplet lens, and the ninth lens L9 and the tenth lens L10 form a cemented doublet lens.

[0183] The optical lens also includes an aperture stop STO positioned between the first lens L1 and the second lens L2.

[0184] Optionally, the optical lens may also include a filter CG having an object-side surface S20 and an image-side surface S21, and / or a protective glass (not shown) having both an object-side surface and an image-side surface. The filter CG and / or the protective glass can be used to correct color aberrations, and can also be used to protect the image sensor chip located at the imaging surface IMA. Light from the object passes sequentially through surfaces S1 to S21 and is ultimately imaged onto the imaging surface IMA.

[0185] Table 3 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens in the optical lens of Example 3, wherein the units of radius of curvature and thickness / distance are millimeters (mm).

[0186]

[0187]

[0188] Table 3

[0189] Example 4

[0190] The following is for reference Figure 4 An optical lens according to Embodiment 4 of this application is described. Figure 4 A schematic diagram of the structure of an optical lens according to Embodiment 4 of this application is shown.

[0191] like Figure 4 As shown, the optical lens includes, in sequence from the object side to the image side, 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.

[0192] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0193] The second lens L2 has negative optical power, with its object side S4 being concave and its image side S5 being convex.

[0194] The third lens L3 has negative optical power, with its object side S6 being convex and its image side S7 being concave.

[0195] The fourth lens L4 has positive optical power, and its object side S7 is convex, while its image side S8 is convex.

[0196] The fifth lens L5 has negative optical power, with its object side S9 being convex and its image side S10 being concave.

[0197] The sixth lens L6 has positive optical power, and its object side S10 is convex, and its image side S11 is convex.

[0198] The seventh lens L7 has negative optical power, with its object side S11 being concave and its image side S12 being convex.

[0199] The eighth lens L8 has positive optical power, with its object side S13 being convex and its image side S14 being concave.

[0200] The ninth lens L9 has positive optical power, with its object side S15 being convex and its image side S16 being concave.

[0201] The tenth lens L10 has negative optical power, with its object side S16 being convex and its image side S17 being concave.

[0202] The third lens L3 and the fourth lens L4 form a cemented doublet lens, the fifth lens L5, the sixth lens L6 and the seventh lens L7 form a cemented triplet lens, and the ninth lens L9 and the tenth lens L10 form a cemented doublet lens.

[0203] The optical lens also includes an aperture stop STO positioned between the first lens L1 and the second lens L2.

[0204] Optionally, the optical lens may also include a filter CG having an object-side surface S18 and an image-side surface S19 and / or a protective glass (not shown) having both an object-side surface and an image-side surface. The filter CG and / or the protective glass can be used to correct color aberrations, and can also be used to protect the image sensor chip located at the imaging surface IMA. Light from the object passes sequentially through each surface S1 to S19 and is ultimately imaged onto the imaging surface IMA.

[0205] Table 4 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens in the optical lens of Example 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0206]

[0207]

[0208] Table 4

[0209] Example 5

[0210] The following is for reference Figure 5 An optical lens according to Embodiment 5 of this application is described. Figure 5 A schematic diagram of the structure of an optical lens according to Embodiment 5 of this application is shown.

[0211] like Figure 5 As shown, the optical lens includes, in sequence from the object side to the image side, 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.

[0212] The first lens L1 has positive optical power, with its object side S1 being convex and its image side S2 being concave.

[0213] The second lens L2 has negative optical power, with its object side S4 being concave and its image side S5 being convex.

[0214] The third lens L3 has positive optical power, and its object side S6 is convex, while its image side S7 is convex.

[0215] The fourth lens L4 has negative optical power, with its object side S7 being concave and its image side S8 being convex.

[0216] The fifth lens L5 has negative optical power, with its object side S9 being convex and its image side S10 being concave.

[0217] The sixth lens L6 has positive optical power, and its object side S10 is convex, and its image side S11 is convex.

[0218] The seventh lens L7 has negative optical power, with its object side S11 being concave and its image side S12 being convex.

[0219] The eighth lens L8 has positive optical power, and its object side S13 is convex, and its image side S14 is convex.

[0220] The ninth lens L9 has positive optical power, with its object side S15 being convex and its image side S16 being concave.

[0221] The tenth lens L10 has negative optical power, with its object side S16 being convex and its image side S17 being concave.

[0222] The third lens L3 and the fourth lens L4 form a cemented doublet lens, the fifth lens L5, the sixth lens L6 and the seventh lens L7 form a cemented triplet lens, and the ninth lens L9 and the tenth lens L10 form a cemented doublet lens.

[0223] The optical lens also includes an aperture stop STO positioned between the first lens L1 and the second lens L2.

[0224] Optionally, the optical lens may also include a filter CG having an object-side surface S18 and an image-side surface S19 and / or a protective glass (not shown) having both an object-side surface and an image-side surface. The filter CG and / or the protective glass can be used to correct color aberrations, and can also be used to protect the image sensor chip located at the imaging surface IMA. Light from the object passes sequentially through each surface S1 to S19 and is ultimately imaged onto the imaging surface IMA.

[0225] Table 5 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens in the optical lens of Example 5, wherein the units of radius of curvature and thickness / distance are millimeters (mm).

[0226]

[0227] Table 5

[0228] In summary, Examples 1 to 5 satisfy the relationships shown in Table 6 below.

[0229]

[0230]

[0231] Table 6

[0232] This application also provides an electronic device that may include an optical lens according to the above embodiments of this application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The electronic device may be a stand-alone electronic device, such as a rangefinder camera, or an imaging module integrated into a rangefinder device. Furthermore, the electronic device may also be a stand-alone imaging device, such as an in-vehicle camera, or an imaging module integrated into a driver assistance system, such as a vehicle-mounted camera.

[0233] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that, The optical lens comprises, along the optical axis from the object side to the image side, the following in sequence: A first lens with positive optical power; A second lens with negative optical power; A third lens with optical power; A fourth lens with optical power; A fifth lens with negative optical power; A sixth lens with positive optical power; A seventh lens with negative optical power; An eighth lens with positive optical power; A ninth lens with positive optical power; and A tenth lens with negative optical power; The optical lens contains ten lenses with optical power. The focal length F6 of the sixth lens and the total focal length F of the optical lens satisfy the following condition: 0.4 ≤ F6 / F ≤ 0.7; The combined focal length F34 of the third lens and the fourth lens satisfies the following condition with respect to the total focal length F of the optical lens: 0.8 ≤ F34 / F ≤ 1.

3.

2. The optical lens according to claim 1, characterized in that, The object-side surface of the first lens is convex, and the image-side surface is concave. The object-side surface of the second lens is concave, and the image-side surface is convex. The object-side surface of the third lens is convex. The image-side surface of the fourth lens is convex. The object-side surface of the fifth lens is convex, and the image-side surface is concave. The object-side surface of the sixth lens is convex, and the image-side surface is also convex. The object-side surface of the seventh lens is concave; The object-side surface of the eighth lens is convex. The object-side surface of the ninth lens is convex; and The image-side surface of the tenth lens is concave.

3. The optical lens according to claim 1, characterized in that, The maximum aperture Dmax of the optical lens and the total optical length TTL of the optical lens satisfy the following condition: 0.3≤Dmax / TTL≤0.

6.

4. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the total focal length F of the optical lens satisfy the following condition: 1.6≤TTL / F≤2.

3.

5. The optical lens according to claim 1, characterized in that, The total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following condition: 1.1≤F / ENPD≤1.

4.

6. The optical lens according to claim 1, characterized in that, The back focal length (BFL) of the optical lens and the total optical length (TTL) of the optical lens satisfy the following condition: 0.1 ≤ BFL / TTL ≤ 0.

3.

7. The optical lens according to any one of claims 1-6, characterized in that, The focal length F1 of the first lens and the total focal length F of the optical lens satisfy: 2.0≤F1 / F≤4.

3.

8. The optical lens according to any one of claims 1-6, characterized in that, The focal length F2 of the second lens and the total focal length F of the optical lens satisfy the condition: -2.7≤F2 / F≤-1.

6.

9. The optical lens according to any one of claims 1-6, characterized in that, The focal length F3 of the third lens and the total focal length F of the optical lens satisfy the condition: -3.3≤F3 / F≤1.

0.

10. The optical lens according to any one of claims 1-6, characterized in that, The focal length F4 of the fourth lens and the total focal length F of the optical lens satisfy the condition: -2.3≤F4 / F≤1.

2.

11. The optical lens according to any one of claims 1-6, characterized in that, The focal length F5 of the fifth lens and the total focal length F of the optical lens satisfy the following condition: -1.2≤F5 / F≤-0.

6.

12. The optical lens according to any one of claims 1-6, characterized in that, The focal length F7 of the seventh lens and the total focal length F of the optical lens satisfy the following condition: -1.0≤F7 / F≤-0.

3.

13. The optical lens according to any one of claims 1-6, characterized in that, The focal length F8 of the eighth lens and the total focal length F of the optical lens satisfy the following condition: 0.5≤F8 / F≤1.

1.

14. The optical lens according to any one of claims 1-6, characterized in that, The focal length F9 of the ninth lens and the total focal length F of the optical lens satisfy the following condition: 0.2≤F9 / F≤1.

1.

15. The optical lens according to any one of claims 1-6, characterized in that, The focal length F10 of the tenth lens and the total focal length F of the optical lens satisfy the following condition: -0.8≤F10 / F≤-0.

1.

16. The optical lens according to any one of claims 1-6, characterized in that, The combined focal length F910 of the ninth lens and the tenth lens satisfies the following condition with respect to the total focal length F of the optical lens: -2.9 ≤ F910 / F ≤ -0.

8.

17. The optical lens according to any one of claims 1-6, characterized in that, The combined focal length F34 of the third and fourth lenses and the combined focal length F567 of the fifth, sixth and seventh lenses satisfy the following condition: -1.9 ≤ F34 / F567 ≤ -0.

1.

18. The optical lens according to any one of claims 1-6, characterized in that, The combined focal length FⅠ of the first lens to the seventh lens and the total focal length F of the optical lens satisfy: 1.7≤FⅠ / F≤6.

9.

19. The optical lens according to any one of claims 1-6, characterized in that, The combined focal length FⅡ of the eighth lens to the tenth lens and the total focal length F of the optical lens satisfy: 0.4≤FⅡ / F≤2.

0.

20. The optical lens according to any one of claims 1-6, characterized in that, The Abbe number VD6 of the sixth lens satisfies: 90≤VD6≤100.

21. The optical lens according to any one of claims 1-6, characterized in that, The refractive index ND9 of the ninth lens satisfies: 1.7≤ND9≤2.

2.

22. The optical lens according to claim 1, characterized in that, The optical lens satisfies at least one of the following: 0.370≤Dmax / TTL≤0.462; 1.750≤TTL / F≤2.183; 1.240≤F / ENPD≤1.4; 0.121≤BFL / TTL≤0.134; 2.213≤F1 / F≤4.081; -2.581≤F² / F≤-1.732; -3.165≤F3 / F≤0.687; -1.963≤F4 / F≤0.856; -1.106≤F5 / F≤-0.707; 0.4≤F6 / F≤0.584; -0.873≤F7 / F≤-0.3; 0.643≤F8 / F≤0.950; 0.310≤F9 / F≤0.975; -0.411≤F10 / F≤-0.223; 0.980≤F34 / F≤1.162; -2.719≤F910 / F≤-0.918; -1.692≤F34 / F567≤-0.197; 1.867≤FⅠ / F≤6.780; 1.372≤FⅡ / F≤1.815; 90≤VD6≤94.5; 94.5≤VD6≤100; 1.83≤ND9≤1.95; Wherein, Dmax is the maximum aperture of the optical lens, TTL is the total optical length of the optical lens, F is the total focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, BFL is the back focal length of the optical lens, F1 is the focal length of the first lens, F2 is the focal length of the second lens, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F5 is the focal length of the fifth lens, F6 is the focal length of the sixth lens, F7 is the focal length of the seventh lens, F8 is the focal length of the eighth lens, and F9 is the focal length of the ninth lens. The focal lengths of the lenses are as follows: F10 is the focal length of the tenth lens; F34 is the combined focal length of the third and fourth lenses; F910 is the combined focal length of the ninth and tenth lenses; F34 is the combined focal length of the third and fourth lenses; F567 is the combined focal length of the fifth, sixth, and seventh lenses; FⅠ is the combined focal length of the first to seventh lenses; FⅡ is the combined focal length of the eighth to tenth lenses; VD6 is the Abbe number of the sixth lens; and ND9 is the refractive index of the ninth lens.

23. An optical lens, characterized in that, The optical lens comprises, along the optical axis from the object side to the image side, the following in sequence: A first lens with positive optical power; A second lens with negative optical power; A third lens with optical power; A fourth lens with optical power; A fifth lens with negative optical power; A sixth lens with positive optical power; A seventh lens with negative optical power; An eighth lens with positive optical power; A ninth lens with positive optical power; A tenth lens with negative optical power; and The eleventh lens with positive optical power; The optical lens contains eleven lenses with optical power. The focal length F6 of the sixth lens and the total focal length F of the optical lens satisfy the condition: 0.4≤F6 / F≤0.

7.

24. The optical lens according to claim 23, characterized in that, The object-side surface of the first lens is convex, and the image-side surface is concave. The object-side surface of the second lens is concave, and the image-side surface is convex. The object-side surface of the third lens is convex. The image-side surface of the fourth lens is convex. The object-side surface of the fifth lens is convex, and the image-side surface is concave. The object-side surface of the sixth lens is convex, and the image-side surface is also convex. The object-side surface of the seventh lens is concave; The object-side surface of the eighth lens is convex. The object-side surface of the ninth lens is convex. The image-side surface of the tenth lens is concave; and The object-side surface of the eleventh lens is convex, and the image-side surface is concave.

25. The optical lens according to claim 23, characterized in that, The maximum aperture Dmax of the optical lens and the total optical length TTL of the optical lens satisfy the following condition: 0.3≤Dmax / TTL≤0.

6.

26. The optical lens according to claim 23, characterized in that, The total optical length TTL of the optical lens and the total focal length F of the optical lens satisfy the following condition: 1.6≤TTL / F≤2.

3.

27. The optical lens according to claim 23, characterized in that, The total focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following condition: 1.1≤F / ENPD≤1.

4.

28. The optical lens according to claim 23, characterized in that, The back focal length (BFL) of the optical lens and the total optical length (TTL) of the optical lens satisfy the following condition: 0.1 ≤ BFL / TTL ≤ 0.

3.

29. The optical lens according to any one of claims 23-28, characterized in that, The focal length F1 of the first lens and the total focal length F of the optical lens satisfy: 2.0≤F1 / F≤4.

3.

30. The optical lens according to any one of claims 23-28, characterized in that, The focal length F2 of the second lens and the total focal length F of the optical lens satisfy the condition: -2.7≤F2 / F≤-1.

6.

31. The optical lens according to any one of claims 23-28, characterized in that, The focal length F3 of the third lens and the total focal length F of the optical lens satisfy the condition: -3.3≤F3 / F≤1.

0.

32. The optical lens according to any one of claims 23-28, characterized in that, The focal length F4 of the fourth lens and the total focal length F of the optical lens satisfy the condition: -2.3≤F4 / F≤1.

2.

33. The optical lens according to any one of claims 23-28, characterized in that, The focal length F5 of the fifth lens and the total focal length F of the optical lens satisfy the following condition: -1.2≤F5 / F≤-0.

6.

34. The optical lens according to any one of claims 23-28, characterized in that, The focal length F7 of the seventh lens and the total focal length F of the optical lens satisfy the following condition: -1.0≤F7 / F≤-0.

3.

35. The optical lens according to any one of claims 23-28, characterized in that, The focal length F8 of the eighth lens and the total focal length F of the optical lens satisfy the following condition: 0.5≤F8 / F≤1.

1.

36. The optical lens according to any one of claims 23-28, characterized in that, The focal length F9 of the ninth lens and the total focal length F of the optical lens satisfy the following condition: 0.2≤F9 / F≤1.

1.

37. The optical lens according to any one of claims 23-28, characterized in that, The focal length F10 of the tenth lens and the total focal length F of the optical lens satisfy the following condition: -0.8≤F10 / F≤-0.

1.

38. The optical lens according to any one of claims 23-28, characterized in that, The combined focal length F34 of the third lens and the fourth lens satisfies the following condition with respect to the total focal length F of the optical lens: 0.8 ≤ F34 / F ≤ 1.

3.

39. The optical lens according to any one of claims 23-28, characterized in that, The combined focal length F910 of the ninth lens and the tenth lens satisfies the following condition with respect to the total focal length F of the optical lens: -2.9 ≤ F910 / F ≤ -0.

8.

40. The optical lens according to any one of claims 23-28, characterized in that, The combined focal length F34 of the third and fourth lenses and the combined focal length F567 of the fifth, sixth and seventh lenses satisfy the following condition: -1.9 ≤ F34 / F567 ≤ -0.

1.

41. The optical lens according to any one of claims 23-28, characterized in that, The combined focal length FⅠ of the first lens to the seventh lens and the total focal length F of the optical lens satisfy: 1.7≤FⅠ / F≤6.

9.

42. The optical lens according to any one of claims 23-28, characterized in that, The combined focal length FⅡ of the eighth lens to the tenth lens and the total focal length F of the optical lens satisfy: 0.4≤FⅡ / F≤2.

0.

43. The optical lens according to any one of claims 23-28, characterized in that, The Abbe number VD6 of the sixth lens satisfies: 90≤VD6≤100.

44. The optical lens according to any one of claims 23-28, characterized in that, The refractive index ND9 of the ninth lens satisfies: 1.7≤ND9≤2.

2.

45. The optical lens according to claim 23, characterized in that, The focal length F11 of the eleventh lens and the total focal length F of the optical lens satisfy the following condition: 1.8≤F11 / F≤3.

7.

46. ​​The optical lens according to claim 23, characterized in that, The combined focal length FⅡ' of the eighth lens to the eleventh lens and the total focal length F of the optical lens satisfy: 0.4≤FⅡ' / F≤2.

0.

47. The optical lens according to claim 23, characterized in that, The optical lens satisfies at least one of the following: 0.370≤Dmax / TTL≤0.462; 1.750≤TTL / F≤2.183; 1.240≤F / ENPD≤1.4; 0.121≤BFL / TTL≤0.134; 2.213≤F1 / F≤4.081; -2.581≤F² / F≤-1.732; -3.165≤F3 / F≤0.687; -1.963≤F4 / F≤0.856; -1.106≤F5 / F≤-0.707; 0.4≤F6 / F≤0.584; -0.873≤F7 / F≤-0.3; 0.643≤F8 / F≤0.950; 0.310≤F9 / F≤0.975; -0.411≤F10 / F≤-0.223; 0.980≤F34 / F≤1.162; -2.719≤F910 / F≤-0.918; -1.692≤F34 / F567≤-0.197; 1.867≤FⅠ / F≤6.780; 90≤VD6≤94.5; 94.5≤VD6≤100; 1.83≤ND9≤1.95; Wherein, Dmax is the maximum aperture of the optical lens, TTL is the total optical length of the optical lens, F is the total focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, BFL is the back focal length of the optical lens, F1 is the focal length of the first lens, F2 is the focal length of the second lens, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F5 is the focal length of the fifth lens, F6 is the focal length of the sixth lens, F7 is the focal length of the seventh lens, and F8 is the focal length of the eighth lens. The focal lengths are: F9 is the focal length of the ninth lens, F10 is the focal length of the tenth lens, F34 is the combined focal length of the third and fourth lenses, F910 is the combined focal length of the ninth and tenth lenses, F34 is the combined focal length of the third and fourth lenses, F567 is the combined focal length of the fifth, sixth and seventh lenses, FⅠ is the combined focal length of the first to the seventh lenses, VD6 is the Abbe number of the sixth lens, and ND9 is the refractive index of the ninth lens.

48. The optical lens according to claim 23, characterized in that, The optical lens satisfies at least one of the following: 2.034≤F11 / F≤3.529; 0.529≤FⅡ' / F≤0.718; Wherein, F11 is the focal length of the eleventh lens, F is the total focal length of the optical lens, and FⅡ' is the combined focal length of the eighth to the eleventh lenses.

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