Optical lens

Abstract

The application discloses an optical lens, which comprises, in sequence from an object side to an imaging surface along an optical axis, a first lens with negative focal length, the image side of which is a concave surface; a second lens with negative focal length, the object side of which is a convex surface and the image side of which is a concave surface; a third lens with positive focal length, the object side of which is a convex surface and the image side of which is a convex surface; a fourth lens with positive focal length, the object side of which is a concave surface and the image side of which is a convex surface; a fifth lens with positive focal length, the object side of which is a convex surface near the optical axis and the image side of which is a concave surface near the optical axis; a sixth lens with positive focal length, the object side of which is a concave surface and the image side of which is a convex surface; and a seventh lens with negative focal length, the object side of which is a convex surface near the optical axis and the image side of which is a concave surface near the optical axis. The optical lens provided by the application has the advantages of a large field of view, a large target surface and high pixels.

Description

Technical Field

[0001] This invention relates to the field of imaging lens technology, and in particular to an optical lens. Background Technology

[0002] As drones continue to upgrade and evolve, consumers are demanding increasingly higher performance from them. Ultra-high resolution, lightweight design, and wide-angle shooting have become the main development trends for drones. To pursue high-quality imaging, most mainstream drones currently use all-glass lenses, with the number of lenses increasing from 5-6 to 7-8. However, the difficulty in reducing the weight of glass lenses has created a bottleneck for all-glass lens technology. Therefore, how to better achieve a wide field of view, large image area, thinness, and high resolution remains a pressing issue. Summary of the Invention

[0003] Therefore, the purpose of this invention is to provide an optical lens that has at least the advantages of a large field of view, a large image area, and high pixel count.

[0004] This invention provides an optical lens comprising, along the optical axis from the object side to the imaging plane, the following components in sequence: a first lens with negative optical power, the image side of which is concave; a second lens with negative optical power, the object side of which is convex and the image side of which is concave; a third lens with positive optical power, the object side of which is convex and the image side of which is convex; a fourth lens with positive optical power, the object side of which is concave and the image side of which is convex; a fifth lens with positive optical power, the object side of which is convex near the optical axis and the image side of which is concave near the optical axis; a sixth lens with positive optical power, the object side of which is concave and the image side of which is convex; and a seventh lens with negative optical power, the object side of which is convex near the optical axis and the image side of which is concave near the optical axis.

[0005] In some embodiments, the object-side surface of the first lens is convex.

[0006] In some embodiments, the object-side surface of the first lens is concave near the optical axis.

[0007] In some embodiments, the maximum field of view (FOV) of the optical lens satisfies: 125° <FOV<140°。

[0008] In some embodiments, the total optical length (TTL) of the optical lens satisfies: 9mm. <TTL<12.5mm。

[0009] In some embodiments, the effective focal length f of the optical lens satisfies: 2.5mm. <f<4.5mm。

[0010] In some embodiments, the image height IH corresponding to the maximum field of view of the optical lens satisfies: 11mm <IH<14mm。

[0011] In some embodiments, the total optical length (TTL) of the optical lens and the effective focal length (f) of the optical lens satisfy: 2.5 <TTL / f<4.0。

[0012] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the image height IH corresponding to the maximum field of view of the optical lens satisfy: 30° < (f × FOV) / IH < 45°.

[0013] In some embodiments, the total optical length TTL of the optical lens and the image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.6 <TTL / IH<1.2。

[0014] In some embodiments, the image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 3.0 <IH / f<4.0。

[0015] In some embodiments, the optical back focal length (BFL) of the optical lens and the effective focal length (f) of the optical lens satisfy: 0.45 <BFL / f<0.6。

[0016] In some embodiments, the effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -3.0 <f1 / f<-0.5。

[0017] In some embodiments, the effective focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -25 <f2 / f<-5。

[0018] In some embodiments, the effective focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.5 <f3 / f<7.0。

[0019] In some embodiments, the effective focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 3.5 <f4 / f<8.0。

[0020] In some embodiments, the effective focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 3.5 <f5 / f<20。

[0021] In some embodiments, the effective focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.3 <f6 / f<1.0。

[0022] In some embodiments, the effective focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -1.0 <f7 / f<-0.3。

[0023] In some embodiments, the maximum effective aperture DM1 of the first lens and the maximum effective aperture DM7 of the seventh lens satisfy: 0.5 < DM1 / DM7 < 0.95.

[0024] In some embodiments, the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: 1.0 < R7 / R8 < 5.0; the curvature radius R7 of the object side of the fourth lens and the effective focal length f of the optical lens satisfy: -8.0 < R7 / f < -2.0.

[0025] In some embodiments, the curvature radius R13 of the object side of the seventh lens and the effective focal length f of the optical lens satisfy: 0.5 < R13 / f < 2.5; the curvature radius R14 of the image side of the seventh lens and the effective focal length f of the optical lens satisfy: 0.1 < R14 / f < 0.6.

[0026] In some embodiments, the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 1.0 < R3 / R4 < 2.0.

[0027] In some embodiments, the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: -1.0 < R5 / R6 < -0.1.

[0028] In some embodiments, the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: 0.5 < R9 / R10 < 1.0.

[0029] In some embodiments, the curvature radius R11 of the object side of the sixth lens and the curvature radius R12 of the image side of the sixth lens satisfy: 8 < R11 / R12 < 12.

[0030] In some embodiments, a stop is disposed between the third lens and the fourth lens.

[0031] In some embodiments, an optical filter is disposed between the seventh lens and the imaging surface.

[0032] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all plastic lenses.

[0033] In some embodiments, at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens has an aspheric lens surface.

[0034] Compared to existing technologies, the optical lens provided by this invention uses seven lenses with optical power. Through specific surface shape settings and reasonable optical power distribution, especially the first and second lenses which use negative optical power, the optical lens can effectively converge a wide range of light, improve the field of view of the optical lens, and at the same time match a 1 / 1.3-inch large target chip to achieve high-definition imaging, thereby better meeting the needs of drones for high image quality, large target area and wide-angle shooting. Attached Figure Description

[0035] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0036] Figure 1 This is a schematic diagram of the structure of the optical lens according to the first embodiment of the present invention.

[0037] Figure 2 This is a field curvature curve diagram of the optical lens according to the first embodiment of the present invention.

[0038] Figure 3 This is an axial chromatic aberration curve of the optical lens in the first embodiment of the present invention.

[0039] Figure 4 This is a chromatic aberration curve of the optical lens in the first embodiment of the present invention.

[0040] Figure 5 This is a schematic diagram of the structure of the optical lens according to the second embodiment of the present invention.

[0041] Figure 6 This is a field curvature curve diagram of the optical lens according to the second embodiment of the present invention.

[0042] Figure 7 This is an axial chromatic aberration curve of the optical lens in the second embodiment of the present invention.

[0043] Figure 8 This is a chromatic aberration curve of the optical lens in the second embodiment of the present invention.

[0044] Figure 9 This is a schematic diagram of the structure of the optical lens according to the third embodiment of the present invention.

[0045] Figure 10 This is a field curvature curve diagram of the optical lens according to the third embodiment of the present invention.

[0046] Figure 11 This is an axial chromatic aberration curve of the optical lens in the third embodiment of the present invention.

[0047] Figure 12 This is a chromatic aberration curve of the optical lens in the third embodiment of the present invention. Detailed Implementation

[0048] To better understand the invention, various aspects of the invention will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of the invention and are not intended to limit the scope of the invention 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.

[0049] 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 the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0050] 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 drawn strictly to scale.

[0051] 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 plane is called the image-side surface of the lens.

[0052] 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 the invention, the word "may" is used to mean "one or more embodiments of the invention." And the term "exemplary" is intended to refer to an example or illustration.

[0053] 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 invention pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0054] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0055] The present invention proposes an optical lens, which comprises, along the optical axis from the object side to the imaging plane, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, and the optical centers of each lens are located on the same straight line.

[0056] In some embodiments, the first lens is configured to have negative optical power, and the object side is convex or concave near the optical axis and the image side is concave. This can acquire as much large-angle incident light as possible, expand the field of view of the optical lens, and at the same time reduce the tendency of light deflection, reduce the difficulty of aberration correction in the subsequent optical system, and improve the imaging quality of the optical lens.

[0057] In some embodiments, the second lens is configured to have negative optical power, with the object side being convex and the image side being concave. This can further diverge the light passing through the first lens to expand the field of view of the optical lens, while also slowing down the light turning trend to make it transition smoothly. It can also balance some of the aberrations generated by the first lens, reduce the sensitivity of the optical system, and improve the imaging quality of the optical lens.

[0058] In some embodiments, the third lens is configured to have positive optical power, and the object side and image side are convex. This can concentrate the light rays passing through the second lens and reduce the light ray height, thereby reducing the aperture of the optical lens. At the same time, it can correct off-axis aberrations and reduce distortion at the edge of the field of view, thus improving the imaging quality of the optical lens.

[0059] In some embodiments, the fourth lens is configured to have positive optical power, with the object side being concave and the image side being convex. This can further converge light rays and make the light path transition smoothly. At the same time, it can balance various aberrations generated by the front optical system and improve the imaging quality of the optical lens.

[0060] In some embodiments, the fifth lens is configured to have positive optical power, with its object side being convex near the optical axis and its image side being concave near the optical axis, which can converge and adjust the light rays exiting from the fourth lens to moderate the turning trend and convergence degree of the light rays, and at the same time increase the final imaging range of the light rays on the imaging surface.

[0061] In some embodiments, the sixth lens is configured to have positive optical power, with its object side being concave and its image side being convex, which can converge the light rays passing through the fifth lens to adjust the direction of light rays in the central field of view and the edge field of view, improve the relative illuminance of the final light rays on the imaging surface, and at the same time correct various aberrations introduced by the front optical system, so as to improve the imaging quality of the optical lens.

[0062] In some embodiments, the seventh lens is configured to have negative optical power, with its object side being convex near the optical axis and its image side being concave near the optical axis, which can effectively suppress the incident angle of the edge field of view to the imaging surface, and transmit more light rays to the imaging surface effectively, so that the light rays can form a clear image on the imaging surface.

[0063] In some embodiments, the aperture stop may be disposed between the third lens and the fourth lens, to converge the range of light rays exiting from the front optical system, reduce the aperture of the rear optical system, and at the same time balance the structure and focal length distribution of the front lens group and the rear lens group.

[0064] In some embodiments, the optical lens may further include a filter, which is disposed between the seventh lens and the imaging surface, to filter out interfering light and prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0065] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.5<TTL / f<4.0. Meeting the above range can effectively limit the length and volume of the optical lens, which is beneficial to realizing the miniaturization and light weight of the optical lens.

[0066] In some embodiments, the effective focal length f of the optical lens, the maximum field of view angle FOV of the optical lens, and the image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 30°<(f×FOV) / IH<45°. Meeting the above range can reasonably limit the relationship among the focal length, the field of view angle and the image height of the optical lens, which is beneficial to realizing the balance between the large field of view angle and large target surface imaging of the optical lens.

[0067] In some embodiments, the total optical length TTL of the optical lens and the image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.6<TTL / IH<1.2. Meeting the above range can reasonably limit the ratio of the total optical length to the image height of the optical lens, enable large target surface imaging while shortening the total optical length, achieve a balance between miniaturization of the optical lens and large target surface imaging, and improve market competitiveness.

[0068] In some embodiments, the image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 3.0<IH / f<4.0. Meeting the above range can endow the optical lens with the characteristic of a large image plane, and better achieve the high-definition imaging quality of the optical lens.

[0069] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.45<BFL / f<0.6. Meeting the above range can make the optical lens have a relatively large back focal length, which is beneficial to the assembly of the module, reduces the interference between the optical lens and the chip, and improves the production yield.

[0070] In some embodiments, the effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -3.0<f1 / f<-0.5. Meeting the above range, the first lens is configured to have a relatively large negative refractive power, which can well converge the light entering the first lens into the optical system, realize a large field of view while facilitating the reduction of the difficulty of aberration correction, and ensure the imaging quality of the optical lens.

[0071] In some embodiments, the effective focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -25<f2 / f<-5; the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 1.0<R3 / R4<2.0. Meeting the above range can reasonably configure the focal length and surface profile of the second lens, so that it can share the negative optical power at the front end of the optical lens, thereby helping to avoid an excessive light deflection trend caused by excessively concentrated optical power of the first lens, and reducing the difficulty of aberration correction.

[0072] In some embodiments, the effective focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.5<f3 / f<7.0; the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: -1.0<R5 / R6<-0.1. Meeting the above range can reasonably configure the focal length and surface profile of the third lens, facilitate the convergence of light, reduce the difficulty of distortion correction for the marginal field of view, ensure that the optical lens has small distortion while achieving a large field of view angle, and improve the overall imaging quality.

[0073] In some embodiments, the effective focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 3.5<f4 / f<8.0. Meeting the above range can reasonably set the focal length of the fourth lens, facilitate the smooth transition of light, and at the same time correct various aberrations of the optical lens, so as to improve the imaging quality of the optical lens.

[0074] In some embodiments, the effective focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 3.5<f5 / f<20; the radius of curvature R9 of the object side of the fifth lens and the radius of curvature R10 of the image side of the fifth lens satisfy: 0.5<R9 / R10<1.0. Meeting the above range can reasonably set the focal length and surface shape of the fifth lens, which is beneficial to slowing down the convergence degree of incident light, and is also beneficial to realizing large target surface imaging of the optical lens, so as to achieve a balance between large target surface imaging and high pixels.

[0075] In some embodiments, the effective focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.3<f6 / f<1.0; the radius of curvature R11 of the object side of the sixth lens and the radius of curvature R12 of the image side of the sixth lens satisfy: 8<R11 / R12<12. Meeting the above range can endow the sixth lens with relatively large positive refractive power and reasonably set the surface shape of the sixth lens, which is beneficial to improving the aberration of the marginal field of view, and enhancing the overall imaging quality of the optical lens.

[0076] In some embodiments, the effective focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -1.0<f7 / f<-0.3. Meeting the above range can make the seventh lens have relatively large negative refractive power, which is beneficial to increasing the incident angle of light reaching the imaging plane, further enlarging the imaging area of the optical lens, and realizing large target surface imaging of the optical lens.

[0077] In some embodiments, the maximum effective aperture DM1 of the first lens and the maximum effective aperture DM7 of the seventh lens satisfy: 0.5<DM1 / DM7<0.95. Meeting the above range can reasonably set the aperture relationship between the first and last lenses in the optical lens, ensure that as much light as possible enters the optical system, and at the same time expand the range of light reaching the imaging plane, so as to better achieve the balance between a large field of view and a large image plane of the optical lens.

[0078] In some embodiments, the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: 1.0<R7 / R8<5.0; the curvature radius R7 of the object side of the fourth lens and the effective focal length f of the optical lens satisfy: -8.0<R7 / f<-2.0. Satisfying the above ranges can reasonably control the surface profile of the fourth lens, so that the spherical aberration contribution of the fourth lens is within a reasonable range, which is beneficial for the optical lens to have high on-axis imaging resolution, thereby facilitating the realization of high-definition imaging of the optical lens.

[0079] In some embodiments, the curvature radius R13 of the object side of the seventh lens and the effective focal length f of the optical lens satisfy: 0.5<R13 / f<2.5; the curvature radius R14 of the image side of the seventh lens and the effective focal length f of the optical lens satisfy: 0.1<R14 / f<0.6. Satisfying the above ranges can reasonably set the shape of the seventh lens, which is beneficial to increase the divergence degree of light rays, enlarge the imaging area of light rays on the imaging surface, realize large target surface imaging of the optical lens, and improve the imaging quality of the optical lens.

[0080] As an embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens may all be made of all-plastic lenses, or may adopt a hybrid glass-plastic collocation, both of which can achieve good imaging effects. In the present application, in order to further reduce the volume and weight of the lens and lower the cost of the lens, all lenses are made of plastic lenses. Meanwhile, at least one of the object side or the image side of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is aspherical. The aspherical lens is characterized in that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens which has a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics, and has the advantages of improving distortion aberration and astigmatic aberration. Preferably, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens all adopt plastic aspherical lenses. In the present application, the adoption of seven plastic aspherical lenses can better match a 1 / 1.3-inch large target surface chip to achieve high-definition imaging, and at the same time realize the balance of small total length, high pixel, light weight and large field of view of the optical lens.

[0081] The present invention will be further described below with reference to a plurality of embodiments. In each embodiment, the thickness, curvature radius and material selection part of each lens in the optical lens are different, and the specific differences can be referred to the parameter tables of the respective embodiments. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the following embodiments. Any other changes, substitutions, combinations or simplifications made without departing from the innovative points of the present invention shall be regarded as equivalent replacement modes, all of which are included within the protection scope of the present invention.

[0082] In various embodiments of the present invention, when an aspherical lens is used, the surface shape of the aspherical lens satisfies the following equation:

[0083]

[0084] Where z is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis, c is the paraxial curvature of the surface, k is the quadratic surface coefficient, and A 2i For the aspherical surface shape coefficient of the 2ith order.

[0085] First Embodiment

[0086] Please see Figure 1 The diagram shown is a structural schematic of the optical lens 100 provided in the first embodiment of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging surface S17, the following components in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0087] The first lens L1 is a plastic aspherical lens with negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens L2 is a plastic aspherical lens with negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens L3 is a plastic aspherical lens with positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens L4 is a plastic aspherical lens with positive optical power, its object-side surface S7 is concave, and its image-side surface S8 is convex. The fifth lens L5 is a plastic aspherical lens with positive optical power. The object-side surface S9 of the fifth lens is convex near the optical axis, and the image-side surface S10 of the fifth lens is concave near the optical axis. The sixth lens L6 is a plastic aspherical lens with positive optical power. The object-side surface S11 of the sixth lens is concave, and the image-side surface S12 of the sixth lens is convex. The seventh lens L7 is a plastic aspherical lens with negative optical power. The object-side surface S13 of the seventh lens is convex near the optical axis, and the image-side surface S14 of the seventh lens is concave near the optical axis. The object-side surface S15 and the image-side surface S16 of the filter G1 are both planar.

[0088] Specifically, the design parameters of each lens of the optical lens 100 provided in this embodiment are shown in Table 1.

[0089] Table 1

[0090]

[0091] The surface shape coefficients of each aspherical surface of the optical lens 100 in this embodiment are shown in Table 2.

[0092] Table 2

[0093]

[0094]

[0095] Please refer to Figure 2 , Figure 3 as well as Figure 4 The figures shown are the field curvature curve, axial chromatic aberration curve, and transverse chromatic aberration curve of the optical lens 100, respectively. Figure 2 As can be seen, the field curvature is controlled within ±0.15mm, indicating that the field curvature of the optical lens 100 is well corrected; from Figure 3 As can be seen, the axial chromatic aberration offset is controlled within ±0.015mm, indicating that the axial chromatic aberration of optical lens 100 is well corrected; from Figure 4 As can be seen, the transverse chromatic aberration between the shortest and longest wavelengths within the entire field of view is controlled within ±4μm, indicating that the transverse chromatic aberration of the optical lens 100 is well corrected; from Figure 2 , Figure 3 as well as Figure 4 It can be seen that the aberrations of the optical lens 100 are well balanced, resulting in good optical imaging quality.

[0096] Second Embodiment

[0097] Please see Figure 5 The figure shown is a schematic diagram of the structure of the optical lens 200 provided in the second embodiment of the present invention. The optical lens 200 in this embodiment is roughly the same as that in the first embodiment, except that the curvature radius of each lens surface, the thickness of each lens, the aspherical coefficient of each lens and other parameters are different.

[0098] Specifically, the design parameters of each lens of the optical lens 200 provided in this embodiment are shown in Table 3.

[0099] Table 3

[0100]

[0101] The surface coefficients of each aspherical surface of the optical lens 200 in this embodiment are shown in Table 4.

[0102] Table 4

[0103] Face number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> S1 -5.3728E+01 1.8853E-02 -3.8274E-03 3.4139E-04 S2 4.6362E-01 1.3727E-02 -6.4799E-04 -1.7933E-03 S3 3.0026E+00 -2.6412E-03 1.4794E-03 -2.1182E-04 S4 3.0050E+00 8.2057E-03 3.2958E-03 1.3953E-03 S5 0.0000E+00 9.2324E-03 4.1143E-03 -1.7073E-04 S6 0.0000E+00 -7.8765E-03 3.0888E-04 4.6258E-03 S7 0.0000E+00 -2.2235E-02 -1.0328E-02 -4.8259E-03 S8 6.9607E+00 -7.0262E-02 3.4821E-02 -3.2508E-02 S9 0.0000E+00 -8.8057E-02 3.4436E-02 -2.0467E-02 S10 0.0000E+00 -4.9681E-02 9.0094E-03 -4.2279E-03 S11 0.0000E+00 5.8881E-03 -2.7431E-03 3.2779E-04 S12 -4.1018E+00 -1.7179E-02 4.8522E-03 -9.9688E-04 S13 -1.4955E+00 -3.1182E-02 5.6941E-04 1.3455E-04 S14 -4.8027E+00 -1.3820E-02 1.3509E-03 -1.0053E-04 Face number <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S1 -2.3562E-05 1.0028E-06 9.4474E-08 -8.1023E-09 S2 5.0048E-04 -8.1254E-05 1.2595E-05 -9.7223E-07 S3 -2.4111E-05 1.7534E-06 -4.4203E-06 -3.2106E-06 S4 -1.5005E-03 -4.9361E-04 1.9537E-05 -3.2466E-05 S5 1.2467E-03 4.3503E-04 -2.9032E-04 3.4970E-04 S6 1.1311E-03 7.1478E-04 -6.5788E-05 1.5540E-03 S7 6.2226E-03 -4.1131E-03 -5.7903E-03 4.3915E-03 S8 8.8071E-03 1.5710E-03 -1.5947E-03 -2.5086E-05 S9 6.1893E-03 -6.9914E-04 -1.0676E-04 1.7482E-05 S10 1.1348E-03 -1.4221E-04 -2.2137E-06 1.7321E-06 S11 -1.0944E-04 1.6609E-05 5.4957E-07 -1.5082E-07 S12 1.1719E-04 -1.1624E-05 8.5628E-07 -1.5993E-08 S13 -6.1484E-05 2.6503E-06 4.1156E-09 2.2964E-08 S14 4.1328E-06 -9.9478E-08 1.5381E-09 -1.3180E-11

[0104] Please refer to Figure 6 , Figure 7 as well as Figure 8The figures shown are the field curvature curve, axial chromatic aberration curve, and transverse chromatic aberration curve of the optical lens 200, respectively. Figure 6 As can be seen, the field curvature is controlled within ±0.05mm, indicating that the field curvature of the 200mm optical lens is well corrected; from Figure 7 As can be seen, the axial chromatic aberration offset is controlled within ±0.01mm, indicating that the axial chromatic aberration of the optical lens 200 is well corrected; from Figure 8 As can be seen, the transverse chromatic aberration between the shortest and longest wavelengths within the entire field of view is controlled within ±4μm, indicating that the transverse chromatic aberration of the optical lens 200 is well corrected; from Figure 6 , Figure 7 as well as Figure 8 It can be seen that the aberrations of the optical lens 200 are well balanced, resulting in good optical imaging quality.

[0105] Third Embodiment

[0106] Please see Figure 9 The figure shows a schematic diagram of the structure of the optical lens 300 provided in the third embodiment of the present invention. The optical lens 300 in this embodiment is generally the same as that in the first embodiment, except that the object side surface S1 of the first lens is concave near the optical axis, and the curvature radius, thickness, aspherical coefficient and other parameters of each lens surface are different.

[0107] Specifically, the design parameters of each lens of the optical lens 300 provided in this embodiment are shown in Table 5.

[0108] Table 5

[0109]

[0110] The surface coefficients of each aspherical surface of the optical lens 300 in this embodiment are shown in Table 6.

[0111] Table 6

[0112]

[0113]

[0114] Please refer to Figure 10 , Figure 11 as well as Figure 12 The figures shown are the field curvature curve, axial chromatic aberration curve, and transverse chromatic aberration curve of the optical lens 300, respectively. Figure 10 As can be seen, the field curvature is controlled within ±0.05mm, indicating that the field curvature of the 300mm optical lens is well corrected; from Figure 11As can be seen, the axial chromatic aberration offset is controlled within ±0.02mm, indicating that the axial chromatic aberration of the 300mm optical lens is well corrected; from Figure 12 As can be seen, the transverse chromatic aberration between the shortest and longest wavelengths within the entire field of view is controlled within ±4μm, indicating that the transverse chromatic aberration of the 300mm optical lens is well corrected; from Figure 10 , Figure 11 as well as Figure 12 It can be seen that the aberrations of the 300mm optical lens are well balanced, resulting in good optical imaging quality.

[0115] Please refer to Table 7, which shows the optical characteristics of the optical lenses provided in the three embodiments above, including the maximum field of view (FOV), total optical length (TTL), image height (IH) corresponding to the maximum field of view, effective focal length (f), aperture value (FNO), and related values ​​corresponding to each of the aforementioned conditional expressions.

[0116] Table 7

[0117] First Embodiment Second Embodiment Third Embodiment FOV (°) 134.000 134.000 134.000 TTL(mm) 11.463 9.901 10.259 f(mm) 3.503 3.781 3.738 IH(mm) 12.400 12.400 12.400 FNO 2.494 2.490 2.494 TTL / f 3.272 2.619 2.745 (f×FOV) / IH(°) 37.855 40.859 40.395 TTL / IH 0.924 0.798 0.827 f1 / f -2.280 -2.110 -1.006 f2 / f -8.508 -6.390 -19.225 R3 / R4 1.434 1.425 1.160 f3 / f 5.478 1.410 0.842 R5 / R6 -0.453 -0.330 -0.166 f4 / f 4.607 4.127 6.039 f5 / f 4.657 6.887 14.968 R9 / R10 0.610 0.813 0.889 f6 / f 0.795 0.669 0.725 R11 / R12 10.940 12.672 13.389 f7 / f -0.832 -0.704 -0.796 DM1 / DM7 0.837 0.601 0.624 R7 / R8 2.994 2.368 1.893 R7 / f -5.113 -3.195 -3.130 R13 / f 1.731 1.242 1.114 R14 / f 0.393 0.316 0.334 IH / f 3.540 3.280 3.317 BFL / f 0.531 0.492 0.498

[0118] In summary, the optical lens in this embodiment of the invention employs seven plastic aspherical lenses with optical power. By rationally allocating the optical power of each lens, rationally matching the surface shape of each lens, and rationally setting the thickness of each lens and the spacing between each lens, a balance of large field of view (FOV>130°), large image area (IH>12mm), miniaturization (TTL<11.5mm), lightweight, and high pixel count can be achieved, thereby meeting the usage requirements of drones.

[0119] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0120] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An optical lens comprising a total of seven lenses having optical power, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: A first lens having negative optical power, wherein the image-side surface of the first lens is concave; A second lens with negative optical power, wherein the object side of the second lens is convex and the image side of the second lens is concave; A third lens with positive optical power, wherein the object-side surface of the third lens is convex and the image-side surface of the third lens is convex; A fourth lens with positive optical power, wherein the object-side surface of the fourth lens is concave and the image-side surface of the fourth lens is convex; A fifth lens with positive optical power, wherein the object-side surface of the fifth lens is convex near the optical axis and the image-side surface of the fifth lens is concave near the optical axis; A sixth lens with positive optical power, wherein the object-side surface of the sixth lens is concave and the image-side surface of the sixth lens is convex; A seventh lens with negative optical power, wherein the object-side surface of the seventh lens is convex near the optical axis and the image-side surface of the seventh lens is concave near the optical axis; Wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.5 <TTL / f<4.0; The radius of curvature R7 of the object-side surface of the fourth lens satisfies -8.0 with respect to the effective focal length f of the optical lens. <R7 / f<-2.0。 2. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the image height IH corresponding to the maximum field of view of the optical lens satisfy the following condition: 30° < (f × FOV) / IH < 45°.

3. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.6 <TTL / IH<1.2。 4. The optical lens according to claim 1, characterized in that, The effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -3.0 <f1 / f<-0.5。 5. The optical lens according to claim 1, characterized in that, The effective focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -25 <f2 / f<-5。 6. The optical lens according to claim 1, characterized in that, The effective focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.5 <f3 / f<7.0。 7. The optical lens according to claim 1, characterized in that, The effective focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 3.5 <f4 / f<8.0。 8. The optical lens according to claim 1, characterized in that, The effective focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 3.5 <f5 / f<20。 9. The optical lens according to claim 1, characterized in that, The effective focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.3 <f6 / f<1.0。 10. The optical lens according to claim 1, wherein a ratio of an effective focal length f7 of the seventh lens to an effective focal length f of the optical lens satisfies: -1.0<f7 / f<-0.

3.

11. The optical lens according to claim 1, wherein a ratio of a maximum effective clear aperture DM1 of the first lens to a maximum effective clear aperture DM7 of the seventh lens satisfies: 0.5<DM1 / DM7<0.

95.

12. The optical lens according to claim 1, wherein a ratio of a curvature radius R7 of an object-side surface of the fourth lens to a curvature radius R8 of an image-side surface of the fourth lens satisfies: 1.0<R7 / R8<5.

0.

13. The optical lens according to claim 1, wherein a ratio of a curvature radius R13 of an object-side surface of the seventh lens to the effective focal length f of the optical lens satisfies: 0.5<R13 / f<2.5; and a ratio of a curvature radius R14 of an image-side surface of the seventh lens to the effective focal length f of the optical lens satisfies: 0.1<R14 / f<0.6.

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