Optical lens

Abstract

This application discloses an optical lens that, along its optical axis from the object side to the image side, sequentially includes a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative 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 an eleventh lens with positive optical power; the object side and image side of the third lens are convex; the object side and image side of the fourth lens are concave; and the object side and image side of the fifth lens are both concave.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical devices, in particular to an eleven-piece optical lens. BACKGROUND

[0002] In recent years, with the continuous progress of science and technology, optical lenses are widely used in the field of security and defense, and higher requirements are put forward for optical lenses used in the field of security and defense. For example, optical lenses need to have high imaging quality.

[0003] However, while meeting the requirement of high imaging quality, the aperture of the existing optical lens is often small, which will affect the shooting effect of the optical lens in the dark environment at night or in rainy days, thereby limiting the application of the optical lens in the field of security and defense. SUMMARY

[0004] The present application provides an optical lens which can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0005] An aspect of the present application provides an optical lens which comprises, in order from the object side to the image side along the optical axis, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, a seventh lens having negative refractive power, an eighth lens having positive refractive power, a ninth lens having positive refractive power, a tenth lens having negative refractive power, and an eleventh lens having positive refractive power. The object side surface of the third lens is convex, and the image side surface is convex. The object side surface of the fourth lens is concave, and the image side surface is concave. The object side surface of the fifth lens is concave, and the image side surface is concave.

[0006] According to an example embodiment of the present application, the object side surface of the first lens is convex, and the image side surface is concave.

[0007] According to an example embodiment of the present application, the object side surface of the second lens is convex, and the image side surface is concave.

[0008] According to an example embodiment of the present application, the object side surface of the sixth lens is convex, and the image side surface is convex.

[0009] According to an example embodiment of the present application, the object side surface of the seventh lens is convex, and the image side surface is concave.

[0010] According to an example embodiment of the present application, the object side surface of the eighth lens is convex, and the image side surface is convex.

[0011] According to an example embodiment of the present application, the object side surface of the ninth lens is convex, and the image side surface is convex.

[0012] According to an example embodiment of the present application, the object side surface of the tenth lens is a concave surface, and the image side surface is a concave surface.

[0013] According to an example embodiment of the present application, the object side surface of the eleventh lens is a convex surface, and the image side surface is a concave surface.

[0014] According to an example embodiment of the present application, the effective focal length F1 of the first lens and the overall focal length F of the optical lens satisfy: 1.7≤F1 / F≤3.0.

[0015] According to an example embodiment of the present application, the effective focal length F2 of the second lens and the overall focal length F of the optical lens satisfy: -2.8≤F2 / F≤-2.0.

[0016] According to an example embodiment of the present application, the refractive index Nd1 of the first lens and the refractive index Nd2 of the second lens satisfy: 0.3≤|Nd1-Nd2|≤0.6; and the color dispersion coefficient Vd1 of the first lens and the color dispersion coefficient Vd2 of the second lens satisfy: 65≤|Vd1-Vd2|≤75.

[0017] According to an example embodiment of the present application, the effective focal length F3 of the third lens and the overall focal length F of the optical lens satisfy: 0.4≤F3 / F≤0.8.

[0018] According to an example embodiment of the present application, the effective focal length F4 of the fourth lens and the overall focal length F of the optical lens satisfy: -0.6≤F4 / F≤-0.3.

[0019] According to an example embodiment of the present application, the combined focal length F34 of the third lens and the fourth lens and the overall focal length F of the optical lens satisfy: -6.1≤F34 / F≤-3.6.

[0020] According to an example embodiment of the present application, the effective focal length F5 of the fifth lens and the overall focal length F of the optical lens satisfy: -1.1≤F5 / F≤-0.7.

[0021] According to an example embodiment of the present application, the effective focal length F6 of the sixth lens and the overall focal length F of the optical lens satisfy: 0.6≤F6 / F≤1.0.

[0022] According to an example embodiment of the present application, the combined focal length F56 of the fifth lens and the sixth lens and the overall focal length F of the optical lens satisfy: 1.7≤F56 / F≤4.5.

[0023] According to an exemplary embodiment of this application, the refractive index Nd5 of the fifth lens and the refractive index Nd6 of the sixth lens satisfy: 0.1≤|Nd5-Nd6|≤0.3; and the dispersion coefficient Vd5 of the fifth lens and the dispersion coefficient Vd6 of the sixth lens satisfy: 4.1≤|Vd5-Vd6|≤5.9.

[0024] According to an exemplary embodiment of this application, the effective focal length F7 of the seventh lens and the total focal length F of the optical lens satisfy: -1.2≤F7 / F≤-0.5.

[0025] According to an exemplary embodiment of this application, the effective focal length F8 of the eighth lens and the total focal length F of the optical lens satisfy: 0.3≤F8 / F≤0.7.

[0026] According to an exemplary embodiment of this application, the combined focal length F78 of the seventh lens and the eighth lens satisfies the following condition with respect to the total focal length F of the optical lens: 0.9 ≤ F78 / F ≤ 2.3.

[0027] According to an exemplary embodiment of this application, the refractive index Nd7 of the seventh lens and the refractive index Nd8 of the eighth lens satisfy: 0≤|Nd7-Nd8|≤0.2; and the dispersion coefficient Vd7 of the seventh lens and the dispersion coefficient Vd8 of the eighth lens satisfy: 5.5≤|Vd7-Vd8|≤6.0.

[0028] According to an exemplary embodiment of this application, the effective focal length F9 of the ninth lens and the total focal length F of the optical lens satisfy: 0.3≤F9 / F≤0.8.

[0029] According to an exemplary embodiment of this application, the effective focal length F10 of the tenth lens and the total focal length F of the optical lens satisfy: -0.5≤F10 / F≤-0.2.

[0030] According to an exemplary embodiment of this application, 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: -4.1≤F910 / F≤-1.1.

[0031] According to an exemplary embodiment of this application, the effective focal length F11 of the eleventh lens and the total focal length F of the optical lens satisfy: 1.5≤F11 / F≤1.9.

[0032] According to an exemplary embodiment of this application, the center thickness CT5 of the fifth lens on the optical axis and the center thickness CT6 of the sixth lens on the optical axis satisfy: 0.1≤CT5 / CT6≤0.3.

[0033] According to an example embodiment of the present application, the central thickness CT7 of the seventh lens on the optical axis and the central thickness CT8 of the eighth lens on the optical axis satisfy: 0.1≤CT7 / CT8≤0.3.

[0034] According to an example embodiment of the present application, the maximum light passing full aperture D1 of the first lens and the total optical length TTL of the optical lens satisfy: 0.1≤D1 / TTL≤0.5.

[0035] According to an example embodiment of the present application, the total focal length F of the optical lens and the total optical length TTL of the optical lens satisfy: 2.4≤TTL / F≤2.9.

[0036] According to an example embodiment of the present application, the back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0≤BFL / TTL≤0.3.

[0037] The present application adopts eleven lenses, and by reasonably allocating the focal power and surface shape of each lens, at least one of the following beneficial effects can be achieved: miniaturization, large aperture, large target, high resolution, and low distortion. BRIEF DESCRIPTION OF DRAWINGS

[0038] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting examples made with reference to the accompanying drawings. In the drawings:

[0039] Figure 1 A structure schematic diagram of an optical lens according to Embodiment 1 of the present application is shown;

[0040] Figure 2 A structure schematic diagram of an optical lens according to Embodiment 2 of the present application is shown;

[0041] Figure 3 A structure schematic diagram of an optical lens according to Embodiment 3 of the present application is shown; and

[0042] Figure 4 A structure schematic diagram of an optical lens according to Embodiment 4 of the present application is shown. DETAILED DESCRIPTION

[0043] In order to better understand the present application, various aspects of the present application are described in detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of example embodiments of the present application, and do not limit the scope of the present application in any way.

[0044] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0045] In this document, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the position of the convex surface is not specified, 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 specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging surface is referred to as the image side surface of the lens.

[0046] It should also be understood that the terms "comprise", "comprising", "have", "having", "include", "including", and / or "contain", "containing", when used in this specification, indicate the presence of the stated features, elements, and / or components but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. It should be noted that the expressions first, second, third, etc. in this specification are merely used to distinguish one feature from another feature, and do not represent any limitation on the features.

[0047] Unless otherwise defined, all terms used in this document have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined in this document.

[0048] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0049] The optical lens according to the exemplary embodiments of the present application can include 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, and the eleven lenses are arranged in order from the object side to the image side along the optical axis.

[0050] In the exemplary embodiments, the first lens can have a positive focal power. The first lens is designed as a positive lens, which is beneficial for collecting the object side light rays into the system, and at the same time, the first lens can fold the light rays entering the system, reducing the incident angle of the light rays entering the rear end lens, thereby compensating for the aberration caused by the edge field of view. In an example, the object side surface of the first lens can be convex, and the image side surface can be concave.

[0051] In an example embodiment, the second lens can have a negative optical power. The second lens is designed as a negative lens, which is beneficial to balance the positive optical power of the first lens and to deflect the light rays exiting from the second lens so that the light rays enter the rear-end lens more gently, which is beneficial to the propagation of the light rays in the rear-end lens. In an example, the object side surface of the second lens can be convex, and the image side surface can be concave.

[0052] In an example embodiment, the first lens and the second lens can be cemented to form a cemented lens. The first lens with a positive optical power is cemented with the second lens with a negative optical power, which is beneficial to correct chromatic aberration and effectively reduce tolerance sensitivity.

[0053] In an example embodiment, the third lens can have a positive optical power. The third lens is designed as a positive lens, which is beneficial to the convergence of the light rays and to make the light rays enter the rear system better, which is beneficial to the optimization of aberration. In an example, the object side surface of the third lens can be convex, and the image side surface can be convex.

[0054] In an example embodiment, the fourth lens can have a negative optical power. The fourth lens is designed as a negative lens, which is beneficial to diverge the light rays exiting from the third lens and to correct the chromatic aberration generated by the third lens. In an example, the object side surface of the fourth lens can be concave, and the image side surface can be concave.

[0055] In an example embodiment, the third lens and the fourth lens can be cemented to form a cemented lens. The third lens with a positive optical power is cemented with the fourth lens with a negative optical power, which is beneficial to the optimization of aberration and the correction of chromatic aberration.

[0056] In an example embodiment, the fifth lens can have a negative optical power. The fifth lens is designed as a negative lens, which is beneficial to increase the aperture of the optical lens, to realize a large aperture of the optical lens, and to correct the aberrations such as field curvature and spherical aberration generated by the first lens, the second lens, the third lens and the fourth lens. In an example, the object side surface of the fifth lens can be concave, and the image side surface can be concave.

[0057] In an example embodiment, the sixth lens can have a positive optical power. The sixth lens is designed as a positive lens, which is beneficial to correct the field curvature generated by the fifth lens and to correct the distortion generated by the third lens and the fourth lens. In an example, the object side surface of the sixth lens can be convex, and the image side surface can be convex.

[0058] In an example embodiment, the fifth lens and the sixth lens can be cemented to form a cemented lens. The fifth lens with a negative optical power is cemented with the sixth lens with a positive optical power, which is beneficial to the correction of chromatic aberration and the reduction of tolerance sensitivity.

[0059] In an example embodiment, the seventh lens can have a negative focal power. The seventh lens is designed as a negative lens, which is beneficial for collecting light rays exiting from the sixth lens into the system. In an example, the object side surface of the seventh lens can be convex, and the image side surface can be concave.

[0060] In an example embodiment, the eighth lens can have a positive focal power. The eighth lens is designed as a positive lens, which is beneficial for converging light rays, while also being able to correct aberrations such as spherical aberration. In an example, the object side surface of the eighth lens can be convex, and the image side surface can be convex.

[0061] In an example embodiment, the seventh lens and the eighth lens can be cemented to form a cemented lens. The seventh lens with a negative focal power and the eighth lens with a positive focal power are cemented, which is beneficial for optimizing aberrations and reducing tolerance sensitivity.

[0062] In an example embodiment, the ninth lens can have a positive focal power. The ninth lens is designed as a positive lens, which is beneficial for converging light rays exiting from the eighth lens, and further correcting aberrations such as additional spherical aberration and coma of the optical lens. In an example, the object side surface of the ninth lens can be convex, and the image side surface can be convex.

[0063] In an example embodiment, the tenth lens can have a negative focal power. The tenth lens is designed as a negative lens, which is beneficial for diverging light rays exiting from the ninth lens, so that the chief ray angle (CRA) of the optical lens is within a reasonable range, thereby realizing large target surface imaging of the optical lens. In an example, the object side surface of the tenth lens can be concave, and the image side surface can be concave.

[0064] In an example embodiment, the ninth lens and the tenth lens can be cemented to form a cemented lens. The ninth lens with a positive focal power and the tenth lens with a negative focal power are cemented, which is beneficial for correcting additional aberrations of the optical lens.

[0065] In an example embodiment, the eleventh lens can have a positive focal power. The eleventh lens is designed as a positive lens, which is beneficial for compensating for the excess negative focal power of the front end lenses, while also being beneficial for correcting distortion, thereby meeting the imaging requirement of low distortion. In an example, the object side surface of the eleventh lens can be convex, and the image side surface can be concave.

[0066] In an example embodiment, any one of the first lens to the eleventh lens can be a spherical lens.

[0067] In an example embodiment, the optical lens can further include a diaphragm disposed between the second lens and the third lens.

[0068] In the example embodiment, the effective focal length F1 of the first lens and the overall focal length F of the optical lens can satisfy: 1.7≤F1 / F≤3.0. Reasonably configuring the effective focal length of the first lens can effectively collect the object side light rays into the system while ensuring the processability of the first lens, and realize the deflection of the light rays, which is conducive to reducing the aberration of the edge field of view.

[0069] In the example embodiment, the effective focal length F2 of the second lens and the overall focal length F of the optical lens can satisfy: -2.8≤F2 / F≤-2.0. Reasonably configuring the effective focal length of the second lens can make the second lens have appropriate negative focal power, which is conducive to compensating for the excessive positive focal power of the first lens and is conducive to the propagation of light rays and reduces the difficulty of chromatic aberration correction.

[0070] In the example embodiment, the refractive index Nd1 of the first lens and the refractive index Nd2 of the second lens can satisfy: 0.3≤|Nd1-Nd2|≤0.6; and the dispersion coefficient Vd1 of the first lens and the dispersion coefficient Vd2 of the second lens can satisfy: 65≤|Vd1-Vd2|≤75. Reasonably configuring the materials of the first lens and the second lens and optimizing the dispersion coefficients of the first lens and the second lens can effectively correct the chromatic aberration of the optical lens, thereby improving the resolving power of the optical lens.

[0071] In the example embodiment, the effective focal length F3 of the third lens and the overall focal length F of the optical lens can satisfy: 0.4≤F3 / F≤0.8. Reasonably configuring the effective focal length of the third lens is conducive to the convergence of light rays, and at the same time, since the third lens is arranged behind the stop, it is more conducive to the optimization of aberration.

[0072] In the example embodiment, the effective focal length F4 of the fourth lens and the overall focal length F of the optical lens can satisfy: -0.6≤F4 / F≤-0.3. Reasonably configuring the effective focal length of the fourth lens can make the fourth lens have appropriate negative focal power, which is conducive to correcting the chromatic aberration generated by the third lens.

[0073] In the example embodiment, the combined focal length F34 of the third lens and the fourth lens and the overall focal length F of the optical lens can satisfy: -6.1≤F34 / F≤-3.6. Reasonably configuring the combined focal length of the third lens and the fourth lens is conducive to correcting the chromatic aberration generated by the third lens, and at the same time, it can also compensate for the additional aberration generated by the front end lens.

[0074] In exemplary embodiments, the effective focal length F5 of the fifth lens and the overall focal length F of the optical lens can satisfy: -1.1≤F5 / F≤-0.7. Reasonably configuring the effective focal length of the fifth lens is conducive to expanding the width of the light bundle, achieving a large aperture of the optical lens, and correcting the aberrations such as field curvature and spherical aberration generated by the first lens, the second lens, the third lens and the fourth lens.

[0075] In exemplary embodiments, the effective focal length F6 of the sixth lens and the overall focal length F of the optical lens can satisfy: 0.6≤F6 / F≤1.0. Reasonably configuring the effective focal length of the sixth lens can make the sixth lens have appropriate positive refractive power, which is conducive to correcting the aberrations such as spherical aberration and chromatic aberration generated by the fifth lens.

[0076] In exemplary embodiments, the combined focal length F56 of the fifth lens and the sixth lens and the overall focal length F of the optical lens can satisfy: 1.7≤F56 / F≤4.5. Reasonably configuring the combined focal length of the fifth lens and the sixth lens can effectively correct the chromatic aberration of the optical lens and reduce the tolerance sensitivity of the optical lens.

[0077] In exemplary embodiments, the refractive index Nd5 of the fifth lens and the refractive index Nd6 of the sixth lens can satisfy: 0.1≤|Nd5-Nd6|≤0.3; and the dispersion coefficient Vd5 of the fifth lens and the dispersion coefficient Vd6 of the sixth lens can satisfy: 4.1≤|Vd5-Vd6|≤5.9. Reasonably configuring the materials of the fifth lens and the sixth lens and optimizing the dispersion coefficients of the fifth lens and the sixth lens can effectively correct the chromatic aberration of the optical lens and reduce the tolerance sensitivity of the optical lens.

[0078] In exemplary embodiments, the effective focal length F7 of the seventh lens and the overall focal length F of the optical lens can satisfy: -1.2≤F7 / F≤-0.5. Reasonably configuring the effective focal length of the seventh lens is conducive to the tracing of light and can better collect the light emitted from the sixth lens into the rear system.

[0079] In exemplary embodiments, the effective focal length F8 of the eighth lens and the overall focal length F of the optical lens can satisfy: 0.3≤F8 / F≤0.7. Reasonably configuring the effective focal length of the eighth lens is conducive to the convergence of light and can well compensate for the axial chromatic aberration generated by the seventh lens and the additional aberration generated by the front lens.

[0080] In exemplary embodiments, the combined focal length F78 of the seventh lens and the eighth lens and the overall focal length F of the optical lens can satisfy: 0.9≤F78 / F≤2.3. Reasonably configuring the combined focal length of the seventh lens and the eighth lens can effectively correct the aberration of the optical lens and reduce the tolerance sensitivity of the optical lens.

[0081] In an example embodiment, the refractive index Nd7 of the seventh lens and the refractive index Nd8 of the eighth lens can satisfy: 0≤|Nd7-Nd8|≤0.2; and the dispersion coefficient Vd7 of the seventh lens and the dispersion coefficient Vd8 of the eighth lens can satisfy: 5.5≤|Vd7-Vd8|≤6.0. Reasonably configuring the materials of the seventh lens and the eighth lens and optimizing the dispersion coefficients of the seventh lens and the eighth lens are conducive to correcting the aberration of the optical lens and eliminating the aberration generated by the seventh lens and the eighth lens to each other.

[0082] In an example embodiment, the effective focal length F9 of the ninth lens and the overall focal length F of the optical lens can satisfy: 0.3≤F9 / F≤0.8. Reasonably configuring the effective focal length of the ninth lens is conducive to re-converging the light rays emitted from the eighth lens and correcting the additional spherical aberration, coma and other aberrations of the optical lens.

[0083] In an example embodiment, the effective focal length F10 of the tenth lens and the overall focal length F of the optical lens can satisfy: -0.5≤F10 / F≤-0.2. Reasonably configuring the effective focal length of the tenth lens is conducive to the divergence of the light rays, thereby effectively controlling the CRA value of the optical lens and realizing large target surface imaging of the optical lens.

[0084] In an example embodiment, the combined focal length F910 of the ninth lens and the tenth lens and the overall focal length F of the optical lens can satisfy: -4.1≤F910 / F≤-1.1. Reasonably configuring the combined focal length of the ninth lens and the tenth lens is conducive to correcting the additional aberration of the optical lens.

[0085] In an example embodiment, the effective focal length F11 of the eleventh lens and the overall focal length F of the optical lens can satisfy: 1.5≤F11 / F≤1.9. Reasonably configuring the effective focal length of the eleventh lens can make the eleventh lens have appropriate positive refractive power, compensate for the excessive negative refractive power at the front end, ensure the refractive power of the optical lens to be balanced, and be conducive to correcting the distortion and meeting the imaging requirement of low distortion.

[0086] In an example embodiment, the central thickness CT5 of the fifth lens on the optical axis and the central thickness CT6 of the sixth lens on the optical axis can satisfy: 0.1≤CT5 / CT6≤0.3. Reasonably configuring the ratio of the central thicknesses of the fifth lens and the sixth lens can reduce the sensitivity of the thickness in the processing process and correct the field curvature and other aberrations, thereby improving the imaging quality of the optical lens.

[0087] In an example embodiment, a central thickness CT7 of the seventh lens on the optical axis and a central thickness CT8 of the eighth lens on the optical axis can satisfy: 0.1≤CT7 / CT8≤0.3. Reasonably configuring the ratio of the central thicknesses of the seventh lens and the eighth lens can reduce the sensitivity of the thickness in the processing process, correct aberrations such as field curvature, and improve the imaging quality of the optical lens.

[0088] In an example embodiment, a maximum light passing full aperture D1 of the first lens and an optical total length TTL of the optical lens can satisfy: 0.1≤D1 / TTL≤0.5. Reasonably configuring the ratio of the maximum light passing full aperture of the first lens and the optical total length of the optical lens is conducive to the miniaturization of the optical lens.

[0089] In an example embodiment, a total focal length F of the optical lens and an optical total length TTL of the optical lens can satisfy: 2.4≤TTL / F≤2.9. Reasonably configuring the ratio of the total focal length of the optical lens and the optical total length of the optical lens can shorten the optical total length of the optical lens and avoid the problem of excessive poor comprehensive performance of the optical lens caused by too small TTL / F.

[0090] In an example embodiment, a back focal length BFL of the optical lens and an optical total length TTL of the optical lens can satisfy: 0≤BFL / TTL≤0.3. Reasonably configuring the ratio of the back focal length of the optical lens and the optical total length of the optical lens can make the optical lens have an appropriate back focal length, avoid the problem of incompatibility between the optical lens and the chip at the rear end caused by too small back focal length, and thus affect the imaging quality of the optical lens.

[0091] In an example embodiment, a chief ray angle CRA of the optical lens can satisfy: CRA≤11.3°. Reasonably configuring the chief ray angle of the optical lens can make the optical lens adapt to a variety of large target chips, ensure that the optical lens has a wider application prospect, and improve the market competitiveness of the optical lens.

[0092] In an example embodiment, an aperture number FNO of the optical lens can satisfy: FNO≤1.3. In an example, FNO≤1.1. Reasonably configuring the aperture number of the optical lens can make the optical lens have sufficient light quantity, and ensure that the optical lens achieves good night vision effect.

[0093] In an example embodiment, the imaging target surface of the optical lens can reach 1 / 1.8", thereby ensuring that the optical lens meets the imaging demand of a large target surface.

[0094] In an example embodiment, the distortion value of the optical lens is in the range of -6% to -2%, ensuring that the optical lens achieves low distortion.

[0095] The optical lens according to the above-mentioned embodiments of the present application can adopt multiple lenses, for example, eleven lenses as mentioned above, by reasonably allocating optical parameters such as the focal power of each lens, the surface shape, the central thickness of each lens, and the axial distance between each lens, at least one of miniaturization, large aperture, large target, high resolution, and low distortion of the optical lens can be achieved.

[0096] Those skilled in the art should understand that the total optical length TTL of the optical lens used in the above is the axial distance from the object side surface of the first lens to the imaging surface. The back focal length BFL of the optical lens is the axial distance from the image side surface of the eleventh lens to the imaging surface.

[0097] However, those skilled in the art should understand that the number of lenses constituting the optical lens can be changed without departing from the technical solutions claimed by the present application, to obtain various results and advantages described in the specification.

[0098] The specific embodiments applicable to the optical lens of the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0099] Example 1

[0100] The following refers to Figure 1 The optical lens according to Embodiment 1 of the present application is described.

[0101] 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, a tenth lens L10 and an eleventh lens L11 along the optical axis from the object side to the imaging surface IMG. The stop STO is arranged between the second lens L2 and the third lens L3. The first lens L1 and the second lens L2 are cemented and form a cemented lens. The third lens L3 and the fourth lens L4 are cemented and form a cemented lens. The fifth lens L5 and the sixth lens L6 are cemented and form a cemented lens. The seventh lens L7 and the eighth lens L8 are cemented and form a cemented lens. The ninth lens L9 and the tenth lens L10 are cemented and form a cemented lens.

[0102] The first lens L1 has positive focal power, the object side surface S1 is convex, and the image side surface is concave.

[0103] The second lens L2 has negative focal power, the object side surface S2 is convex, and the image side surface S3 is concave.

[0104] The third lens L3 has positive focal power, the object side surface S4 is convex, and the image side surface is convex.

[0105] The fourth lens L4 has negative focal power, the object side surface S5 is concave, and the image side surface S6 is concave.

[0106] The fifth lens L5 has negative refractive power, and its object side surface S7 is concave, and its image side surface is concave.

[0107] The sixth lens L6 has positive refractive power, and its object side surface S8 is convex, and its image side surface S9 is convex.

[0108] The seventh lens L7 has negative refractive power, and its object side surface S10 is convex, and its image side surface is concave.

[0109] The eighth lens L8 has positive refractive power, and its object side surface S11 is convex, and its image side surface S12 is convex.

[0110] The ninth lens L9 has positive refractive power, and its object side surface S13 is convex, and its image side surface is convex.

[0111] The tenth lens L10 has negative refractive power, and its object side surface S14 is concave, and its image side surface S15 is concave.

[0112] The eleventh lens L11 has positive refractive power, and its object side surface S16 is convex, and its image side surface S17 is concave.

[0113] A filter CG can also be arranged between the eleventh lens L11 and the imaging surface IMG. The filter CG has an object side surface S18 and an image side surface S19. Light from the object sequentially passes through the surfaces S1 to S19 and is finally imaged on the imaging surface IMG. It should be noted that the surfaces S1 to S19 are not shown in Figure 1 .

[0114] Table 1 shows a basic parameter table of the optical lens of Embodiment 1, wherein the units of the radius of curvature, the thickness / distance are millimeters (mm). The aperture number FNO of the optical lens is 1.1. The distortion value of the optical lens is -2.43%.

[0115]

[0116] Table 1

[0117] Example 2

[0118] Embodiment 2 of the present application is described below with reference to Figure 2 . An optical lens is provided.

[0119] As Figure 2As shown, the optical lens comprises, along the optical axis, in order from the object side to the image plane IMG, 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. A stop STO is disposed between the second lens L2 and the third lens L3. The first lens L1 and the second lens L2 are cemented and form a cemented lens. The third lens L3 and the fourth lens L4 are cemented and form a cemented lens. The fifth lens L5 and the sixth lens L6 are cemented and form a cemented lens. The seventh lens L7 and the eighth lens L8 are cemented and form a cemented lens. The ninth lens L9 and the tenth lens L10 are cemented and form a cemented lens.

[0120] The first lens L1 has positive refractive power, the object side surface S1 is a convex surface, and the image side surface is a concave surface.

[0121] The second lens L2 has negative refractive power, the object side surface S2 is a convex surface, and the image side surface S3 is a concave surface.

[0122] The third lens L3 has positive refractive power, the object side surface S4 is a convex surface, and the image side surface is a convex surface.

[0123] The fourth lens L4 has negative refractive power, the object side surface S5 is a concave surface, and the image side surface S6 is a concave surface.

[0124] The fifth lens L5 has negative refractive power, the object side surface S7 is a concave surface, and the image side surface is a concave surface.

[0125] The sixth lens L6 has positive refractive power, the object side surface S8 is a convex surface, and the image side surface S9 is a convex surface.

[0126] The seventh lens L7 has negative refractive power, the object side surface S10 is a convex surface, and the image side surface is a concave surface.

[0127] The eighth lens L8 has positive refractive power, the object side surface S11 is a convex surface, and the image side surface S12 is a convex surface.

[0128] The ninth lens L9 has positive refractive power, the object side surface S13 is a convex surface, and the image side surface is a convex surface.

[0129] The tenth lens L10 has negative refractive power, the object side surface S14 is a concave surface, and the image side surface S15 is a concave surface.

[0130] The eleventh lens L11 has positive refractive power, the object side surface S16 is a convex surface, and the image side surface S17 is a concave surface.

[0131] A filter CG can also be provided between the eleventh lens L11 and the imaging plane IMG. The filter CG has an object side surface S18 and an image side surface S19. Light from the object passes through the surfaces S1 to S19 in sequence and is finally imaged on the imaging plane IMG. It should be noted that the surfaces S1 to S19 are not shown in Figure 2 .

[0132] Table 2 shows a basic parameter table of the optical lens of Example 2, where the units of the radius of curvature, thickness / distance are millimeters (mm). The optical lens has an aperture number FNO of 1.1. The distortion value of the optical lens is -2.27%.

[0133]

[0134]

[0135] Table 2

[0136] Example 3

[0137] The optical lens according to Example 3 of the present application is described below with reference to Figure 3 .

[0138] As shown in Figure 3 , the optical lens comprises, along the optical axis from the object side to the imaging plane IMG, 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. A stop STO is provided between the second lens L2 and the third lens L3. The first lens L1 and the second lens L2 are cemented and form a cemented lens. The third lens L3 and the fourth lens L4 are cemented and form a cemented lens. The fifth lens L5 and the sixth lens L6 are cemented and form a cemented lens. The seventh lens L7 and the eighth lens L8 are cemented and form a cemented lens. The ninth lens L9 and the tenth lens L10 are cemented and form a cemented lens.

[0139] The first lens L1 has a positive refractive power, the object side surface S1 is a convex surface, and the image side surface is a concave surface.

[0140] The second lens L2 has a negative refractive power, the object side surface S2 is a convex surface, and the image side surface S3 is a concave surface.

[0141] The third lens L3 has a positive refractive power, the object side surface S4 is a convex surface, and the image side surface is a convex surface.

[0142] The fourth lens L4 has a negative refractive power, the object side surface S5 is a concave surface, and the image side surface S6 is a concave surface.

[0143] The fifth lens L5 has a negative refractive power, the object side surface S7 is a concave surface, and the image side surface is a concave surface.

[0144] The sixth lens L6 has positive refractive power, the object side surface S8 is a convex surface, and the image side surface S9 is a convex surface.

[0145] The seventh lens L7 has negative refractive power, the object side surface S10 is a convex surface, and the image side surface is a concave surface.

[0146] The eighth lens L8 has positive refractive power, the object side surface S11 is a convex surface, and the image side surface S12 is a convex surface.

[0147] The ninth lens L9 has positive refractive power, the object side surface S13 is a convex surface, and the image side surface is a convex surface.

[0148] The tenth lens L10 has negative refractive power, the object side surface S14 is a concave surface, and the image side surface S15 is a concave surface.

[0149] The eleventh lens L11 has positive refractive power, the object side surface S16 is a convex surface, and the image side surface S17 is a concave surface.

[0150] A filter CG can also be arranged between the eleventh lens L11 and the imaging plane IMG. The filter CG has an object side surface S18 and an image side surface S19. Light from the object sequentially passes through the surfaces S1 to S19 and is finally imaged on the imaging plane IMG. It should be noted that the surfaces S1 to S19 are not shown in Figure 3 .

[0151] Table 3 shows the basic parameter table of the optical lens of Embodiment 3, wherein the units of the radius of curvature, the thickness / distance are millimeters (mm). The aperture number FNO of the optical lens is 1.1. The distortion value of the optical lens is -2.56%.

[0152]

[0153] Table 3

[0154] Example 4

[0155] Embodiment 4 of the present application is described below with reference to Figure 4 . An optical lens according to Embodiment 4 of the present application is described below with reference to

[0156] As Figure 4As shown, the optical lens comprises, along the optical axis, in order from the object side to the image plane IMG, 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. A stop STO is disposed between the second lens L2 and the third lens L3. The first lens L1 and the second lens L2 are cemented and form a cemented lens. The third lens L3 and the fourth lens L4 are cemented and form a cemented lens. The fifth lens L5 and the sixth lens L6 are cemented and form a cemented lens. The seventh lens L7 and the eighth lens L8 are cemented and form a cemented lens. The ninth lens L9 and the tenth lens L10 are cemented and form a cemented lens.

[0157] The first lens L1 has positive refractive power, the object side surface S1 is a convex surface, and the image side surface is a concave surface.

[0158] The second lens L2 has negative refractive power, the object side surface S2 is a convex surface, and the image side surface S3 is a concave surface.

[0159] The third lens L3 has positive refractive power, the object side surface S4 is a convex surface, and the image side surface is a convex surface.

[0160] The fourth lens L4 has negative refractive power, the object side surface S5 is a concave surface, and the image side surface S6 is a concave surface.

[0161] The fifth lens L5 has negative refractive power, the object side surface S7 is a concave surface, and the image side surface is a concave surface.

[0162] The sixth lens L6 has positive refractive power, the object side surface S8 is a convex surface, and the image side surface S9 is a convex surface.

[0163] The seventh lens L7 has negative refractive power, the object side surface S10 is a convex surface, and the image side surface is a concave surface.

[0164] The eighth lens L8 has positive refractive power, the object side surface S11 is a convex surface, and the image side surface S12 is a convex surface.

[0165] The ninth lens L9 has positive refractive power, the object side surface S13 is a convex surface, and the image side surface is a convex surface.

[0166] The tenth lens L10 has negative refractive power, the object side surface S14 is a concave surface, and the image side surface S15 is a concave surface.

[0167] The eleventh lens L11 has positive refractive power, the object side surface S16 is a convex surface, and the image side surface S17 is a concave surface.

[0168] A filter CG can also be disposed between the eleventh lens L11 and the imaging plane IMG. The filter CG has an object side surface S18 and an image side surface S19. Light from the object passes through the surfaces S1 to S19 in sequence and is finally imaged on the imaging plane IMG. It should be noted that the surfaces S1 to S19 are not shown in Figure 4

[0169] Table 4 shows the basic parameter table of the optical lens of Example 4, wherein the units of the radius of curvature, the thickness / distance are all millimeters (mm). The F-number FNO of the optical lens is 1.1. The distortion value of the optical lens is -2.34%.

[0170]

[0171] Table 4

[0172] In summary, the conditional expressions in Examples 1 to 4 satisfy the relationships shown in Table 5.

[0173]

[0174]

[0175] Table 5

[0176] The present application also provides an imaging device, whose electronic photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS), which is equipped with the optical lens described above.

[0177] The above description is merely preferred embodiments of the present application and the technical principles used. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combinations of the technical features described above or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by the mutual replacement of the above features and the technical features disclosed in the present application (but not limited to) having similar functions.​

Claims

1. An optical lens characterized in that, In order from the object side to the image side along the optical axis, comprises: a first lens with positive refractive power; a second lens with negative refractive power; a third lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is convex; a fourth lens with negative refractive power, the object side surface of which is concave, and the image side surface of which is concave; a fifth lens with negative refractive power, the object side surface of which is concave, and the image side surface of which is concave; 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; a tenth lens with negative refractive power; and an eleventh lens with positive refractive power; wherein the optical lens has eleven lenses with refractive power; the effective focal length F11 of the eleventh lens and the overall focal length F of the optical lens satisfy: 1.5≤F11 / F≤1.

9.

2. The optical lens according to claim 1, wherein the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex; the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave; the object side surface of the eighth lens is convex, and the image 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 ninth lens is convex; the object side surface of the tenth lens is concave, and the image side surface of the tenth lens is concave; the object side surface of the eleventh lens is convex, and the image side surface of the eleventh lens is concave.

3. The optical lens of claim 1 or 2, wherein, the effective focal length F1 of the first lens and the overall focal length F of the optical lens satisfy: 1.7≤F1 / F≤3.

0.

4. The optical lens of claim 1 or 2, wherein, the effective focal length F2 of the second lens and the overall focal length F of the optical lens satisfy: -2.8≤F2 / F≤-2.

0.

5. The optical lens of claim 1 or 2, wherein, the refractive index Nd1 of the first lens and the refractive index Nd2 of the second lens satisfy: 0.3≤|Nd1-Nd2|≤0.6; and the dispersion coefficient Vd1 of the first lens and the dispersion coefficient Vd2 of the second lens satisfy: 65≤|Vd1-Vd2|≤75.

6. The optical lens of claim 1 or 2, wherein, the effective focal length F3 of the third lens and the overall focal length F of the optical lens satisfy: 0.4≤F3 / F≤0.

8.

7. The optical lens of claim 1 or 2, wherein, the effective focal length F4 of the fourth lens and the overall focal length F of the optical lens satisfy: -0.6≤F4 / F≤-0.

3.

8. The optical lens of claim 1 or 2, wherein, the combined focal length F34 of the third lens and the fourth lens and the overall focal length F of the optical lens satisfy: -6.1≤F34 / F≤-3.

6.

9. The optical lens of claim 1 or 2, wherein, the effective focal length F5 of the fifth lens and the overall focal length F of the optical lens satisfy: -1.1≤F5 / F≤-0.

7.

10. The optical lens of claim 1 or 2, wherein, the effective focal length F6 of the sixth lens and the overall focal length F of the optical lens satisfy: 0.6≤F6 / F≤1.

0.

11. The optical lens of claim 1 or 2, wherein, the combined focal length F56 of the fifth lens and the sixth lens and the overall focal length F of the optical lens satisfy: 1.7≤F56 / F≤4.

5.

12. The optical lens of claim 1 or 2, wherein, The refractive index Nd5 of the fifth lens and the refractive index Nd6 of the sixth lens satisfy: 0.1≤|Nd5-Nd6|≤0.3; and the dispersion coefficient Vd5 of the fifth lens and the dispersion coefficient Vd6 of the sixth lens satisfy: 4.1≤|Vd5-Vd6|≤5.

9.

13. The optical lens of claims 1 or 2, wherein, The effective focal length F7 of the seventh lens and the overall focal length F of the optical lens satisfy: -1.2≤F7 / F≤-0.

5.

14. The optical lens of claims 1 or 2, wherein, The effective focal length F8 of the eighth lens and the overall focal length F of the optical lens satisfy: 0.3≤F8 / F≤0.

7.

15. The optical lens of claims 1 or 2, wherein, The combined focal length F78 of the seventh lens and the eighth lens and the overall focal length F of the optical lens satisfy: 0.9≤F78 / F≤2.

3.

16. The optical lens of claims 1 or 2, wherein, The refractive index Nd7 of the seventh lens and the refractive index Nd8 of the eighth lens satisfy: 0≤|Nd7-Nd8|≤0.2; and the dispersion coefficient Vd7 of the seventh lens and the dispersion coefficient Vd8 of the eighth lens satisfy: 5.5≤|Vd7-Vd8|≤6.

0.

17. The optical lens of claims 1 or 2, wherein, The effective focal length F9 of the ninth lens and the overall focal length F of the optical lens satisfy: 0.3≤F9 / F≤0.

8.

18. The optical lens of claims 1 or 2, wherein, The effective focal length F10 of the tenth lens and the overall focal length F of the optical lens satisfy: -0.5≤F10 / F≤-0.

2.

19. The optical lens of claims 1 or 2, wherein, The combined focal length F910 of the ninth lens and the tenth lens and the overall focal length F of the optical lens satisfy: -4.1≤F910 / F≤-1.

1.

20. The optical lens of claims 1 or 2, wherein, The central thickness CT5 of the fifth lens on the optical axis and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.1≤CT5 / CT6≤0.

3.

21. The optical lens of claims 1 or 2, wherein, The central thickness CT7 of the seventh lens on the optical axis and the central thickness CT8 of the eighth lens on the optical axis satisfy: 0.1≤CT7 / CT8≤0.

3.

22. The optical lens of claims 1 or 2, wherein, The maximum light passing full aperture D1 of the first lens and the total optical length TTL of the optical lens satisfy: 0.1≤D1 / TTL≤0.

5.

23. The optical lens of claims 1 or 2, wherein, The overall focal length F of the optical lens and the total optical length TTL of the optical lens satisfy: 2.4≤TTL / F≤2.

9.

24. The optical lens of claims 1 or 2, wherein, The back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0≤BFL / TTL≤0.

3.

25. The optical lens of claims 1 or 2, wherein, The optical lens satisfies at least one of the following conditional expressions: 1.958≤F1 / F≤2.089; -2.571≤F2 / F≤-2.465; 0.645≤F3 / F≤0.663; -0.503≤F4 / F≤-0.487; -3.857≤F34 / F≤-3.704; -0.871≤F5 / F≤-0.844; 0.819≤F6 / F≤0.836; 4.236≤F56 / F≤4.396; -0.937≤F7 / F≤-0.921; 0.509≤F8 / F≤0.520; 1.084≤F78 / F≤1.126; 0.615≤F9 / F≤0.627; -0.344≤F10 / F≤-0.337; -1.306≤F910 / F≤-1.269; 1.716≤F11 / F≤1.769; 0.190≤CT5 / CT6≤0.199; 0.149≤CT7 / CT8≤0.172; 0.349≤D1 / TTL≤0.357; 2.557≤TTL / F≤2.569; 0≤BFL / TTL≤0.093; wherein, F1 is an effective focal length of the first lens, F is a total focal length of the optical lens, F2 is an effective focal length of the second lens, F3 is an effective focal length of the third lens, F4 is an effective focal length of the fourth lens, F34 is a combined focal length of the third lens and the fourth lens, F5 is an effective focal length of the fifth lens, F6 is an effective focal length of the sixth lens, F56 is a combined focal length of the fifth lens and the sixth lens, F7 is an effective focal length of the seventh lens, F8 is an effective focal length of the eighth lens, F78 is a combined focal length of the seventh lens and the eighth lens, F9 is an effective focal length of the ninth lens, F10 is an effective focal length of the tenth lens, F910 is a combined focal length of the ninth lens and the tenth lens, F11 is an effective focal length of the eleventh lens, CT5 is a central thickness of the fifth lens on the optical axis, CT6 is a central thickness of the sixth lens on the optical axis, CT7 is a central thickness of the seventh lens on the optical axis, CT8 is a central thickness of the eighth lens on the optical axis, D1 is a maximum light passing full aperture of the first lens, TTL is an optical total length of the optical lens, and BFL is a back focal length of the optical lens.

Images