An optical lens and camera module

Abstract

This application relates to the field of camera technology, providing an optical lens and a camera module. The optical lens includes a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group arranged from the object side to the image side. The first, third, and fifth lens groups have positive optical power, while the second and fourth lens groups have negative optical power. The second lens group is movable along the optical axis of the optical lens to achieve zoom between the wide-angle and telephoto ends. The fourth lens group includes one lens and is movable along the optical axis of the optical lens to enable focusing and imaging between infinity and near-focus. This optical lens achieves a focusing range between 1 meter near-focus and infinity, balancing miniaturization, lightweight design, and high image quality.

Description

Technical Field

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

[0002] With the continuous development of drone technology, drone photography has become a new favorite in the field of photography. In drone photography, the choice of optical lens is particularly important. Typically, the most basic and commonly used lenses on drones are those with a standard focal length between 35mm and 100mm. Lenses within this focal length range offer a relatively moderate angle of view and field of vision, capable of presenting a fairly realistic human visual effect, and are widely used for shooting landscapes, portraits, and general aerial photography.

[0003] As filmmakers demand higher image quality, they often equip drones with prime lenses. However, prime lenses typically have a sensor size within Micro Four Thirds (M4 / 3), limiting their field of view. In contrast, zoom lenses allow drones to achieve optical zoom at specific working distances, giving filmmakers more creative freedom. However, full-frame zoom lenses are generally quite large and unsuitable for drones.

[0004] Therefore, how to balance miniaturization, light weight, and high image quality in the focusing process between infinity and 1 meter close focus of optical lenses has become an important issue in the industry. Summary of the Invention

[0005] The embodiments of this application provide an optical lens and camera module that can effectively balance miniaturization, lightweight design, and high image quality between infinity and near-focus.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, embodiments of this application provide an optical lens. The optical lens includes a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group arranged from the object side to the image side. The first lens group, the third lens group, and the fifth lens group have positive optical power, while the second lens group and the fourth lens group have negative optical power. The second lens group is movable along the optical axis of the optical lens to enable zooming between a wide-angle end and a telephoto end. The fourth lens group includes one lens and is movable along the optical axis of the optical lens to enable focusing and imaging between infinity and near-focus.

[0008] By rationally allocating the optical power of each lens group, aberrations can be effectively balanced, and resolving power can be improved. Furthermore, with the same air gap between the third and fifth lens groups, compared to moving multiple lenses, moving a fourth lens group with a single lens having negative optical power can not only compensate for image plane movement during the zooming process of the second lens group, but also adapt to image plane displacement caused by changes in object distance, thereby improving image quality. Moreover, it relatively reduces the number and weight of lenses, and also reduces the power required to drive the fourth lens group, further facilitating the miniaturization, lightweighting, and fast focusing of the optical lens. In addition, reducing the number of fourth lens groups increases their movable range, enabling the optical lens to achieve clear imaging over a wide range of object distances.

[0009] In some embodiments, the optical lens includes a plurality of lenses; the second lens group includes at least two lenses with negative optical power and one lens with positive optical power; the first lens group includes at least one lens with negative optical power and one lens with positive optical power; the third lens group includes at least one lens with negative optical power and two lenses with positive optical power; and the fifth lens group includes at least one lens with negative optical power and one lens with positive optical power.

[0010] The above configuration enables the second lens group to have a strong negative optical power, thereby achieving a smaller telephoto ratio. In addition, the second lens group contains at least one lens with positive optical power, which can effectively correct and compensate for various aberrations. At the same time, it allows the optical powers of each lens group to be well balanced, thereby improving the imaging quality of the optical lens.

[0011] In some embodiments, the second lens group includes one cemented lens, which is mainly composed of two lenses.

[0012] The above settings not only reduce the tolerance sensitivity of the optical lens, thus improving image quality, but also facilitate the assembly of the optical lens.

[0013] In some embodiments, the first lens group includes a cemented lens.

[0014] The above settings not only further reduce the tolerance sensitivity of the optical lens, thus improving image quality, but also facilitate the assembly of the optical lens.

[0015] In some embodiments, the third lens group includes a cemented lens.

[0016] The above settings not only further reduce the tolerance sensitivity of the optical lens, thus improving image quality, but also facilitate the assembly of the optical lens.

[0017] In some embodiments, the number of lenses is 11 to 15.

[0018] The above settings help to achieve both optical performance and miniaturization in optical lenses.

[0019] In some embodiments, at least one of the lenses in the optical lens is an aspherical lens.

[0020] The above settings not only effectively correct aberrations and improve resolution, but also facilitate the miniaturization of optical lenses.

[0021] In some embodiments, when the optical lens is at infinity, the effective focal length ft, aperture Fnot, and maximum half-image height H of the optical lens at the telephoto end satisfy the following relationship: 0.85≤(ft / Fnot) / H≤1.15.

[0022] By reasonably selecting the above parameters, when the ratio (ft / Fnot) / H satisfies the above relationship, the optical lens can effectively suppress the relative size of the front end of the optical lens, which is close to the object side, while achieving an appropriate zoom ratio, thus contributing to the miniaturization and lightness of the optical lens.

[0023] In some embodiments, the optical length OAL1 of the first lens group and the combined focal length f1 of the first lens group satisfy the relationship: 0.08≤OAL1 / f1≤0.13.

[0024] By reasonably selecting the above parameters, when the ratio OAL1 / f1 satisfies the above relationship, the optical lens can not only effectively suppress the length of the lens and ensure the compact size requirement of the lens, but also achieve a good balance of aberrations, thereby improving the image quality.

[0025] In some embodiments, the displacement S2 of the second lens group G2 on the optical axis when zooming between the wide-angle end and the telephoto end and the focal length f2 of the second lens group satisfy the relationship: 0.55≤|S2 / f2|≤0.65.

[0026] By reasonably selecting the above parameters, when the ratio S2 / f2 satisfies the above relationship, the optical lens can control the zoom displacement S2 of the second lens group G2 within an appropriate range while achieving an appropriate zoom ratio, thus achieving the goal of balancing the zoom ratio and miniaturization of the optical lens.

[0027] In some embodiments, when the optical lens is at infinity, the effective focal length ft of the optical lens at the telephoto end and the focal length f3 of the third lens group satisfy the following relationship: 0.11≤f3 / ft≤0.15.

[0028] By reasonably selecting the above parameters, when the ratio f3 / ft satisfies the above relationship, the optical power of the third lens group G3 can be kept within a suitable range to better correct various aberrations such as spherical aberration and image plane curvature, while also being conducive to the compactness of optical lenses.

[0029] In some embodiments, the focal length f2 of the second lens group and the focal length f4 of the fourth lens group satisfy the relationship: 0.65≤f4 / f2≤0.95.

[0030] By reasonably selecting the above parameters, when the ratio f4 / f2 satisfies the above relationship, the optical lens can better correct various aberrations such as spherical aberration and image plane curvature, and at the same time, it is also conducive to the compactness of the lens.

[0031] In some embodiments, when the optical lens is at infinity, the effective focal length ft of the optical lens at the telephoto end and the optical length OAL5 of the fifth lens group satisfy the following relationship: 0.16≤OAL5 / ft≤0.24.

[0032] By reasonably selecting the above parameters, when the ratio OAL5 / ft satisfies the above relationship, the optical lens can better correct aberrations such as spherical aberration, coma, and field curvature, thereby improving the image quality, while ensuring that the length of the fifth lens group G5 is within a suitable range.

[0033] Secondly, embodiments of this application provide a camera module, including a photosensitive element and the optical lens described in the first aspect, wherein the photosensitive element is disposed on the image side of the optical lens.

[0034] The camera module in this embodiment has the same structure and technical effect as the optical lens in the first aspect, and will not be described again here. Attached Figure Description

[0035] Figure 1 A schematic diagram of the structure of the optical lens provided in Embodiment 1 of this application when it is simultaneously at the wide-angle end at infinity;

[0036] Figure 2 A schematic diagram of the structure of the optical lens provided in Embodiment 1 of this application when it is simultaneously at the telephoto end at infinity;

[0037] Figure 3 An axial aberration diagram of the optical lens provided in Embodiment 1 of this application when it is simultaneously at the wide-angle end at infinity;

[0038] Figure 4 A field curvature diagram of an optical lens at infinity and simultaneously at the wide-angle end, as provided in Embodiment 1 of this application;

[0039] Figure 5 The distortion diagram of the optical lens provided in Embodiment 1 of this application when it is simultaneously at the wide-angle end at infinity;

[0040] Figure 6 An axial aberration diagram of the optical lens provided in Embodiment 1 of this application when it is simultaneously at the telephoto end at infinity;

[0041] Figure 7 A field curvature diagram of an optical lens provided in Embodiment 1 of this application when it is simultaneously at the telephoto end at infinity;

[0042] Figure 8 The distortion diagram of the optical lens provided in Embodiment 1 of this application when it is simultaneously at the telephoto end at infinity;

[0043] Figure 9 A schematic diagram of the structure of the optical lens provided in Embodiment 2 of this application when it is simultaneously at the wide-angle end at infinity;

[0044] Figure 10 This is a schematic diagram of the structure of the optical lens provided in Embodiment 2 of this application when it is simultaneously at the telephoto end at infinity.

[0045] Figure 11 An axial aberration diagram of the optical lens provided in Embodiment 2 of this application when it is simultaneously at the wide-angle end at infinity;

[0046] Figure 12 The field curvature diagram of the optical lens provided in Embodiment 2 of this application when it is simultaneously at the wide-angle end at infinity;

[0047] Figure 13 The distortion diagram of the optical lens provided in Embodiment 2 of this application when it is simultaneously at the wide-angle end at infinity;

[0048] Figure 14 An axial aberration diagram of the optical lens provided in Embodiment 2 of this application when it is simultaneously at the telephoto end at infinity;

[0049] Figure 15 The field curvature diagram of the optical lens provided in Embodiment 2 of this application when it is simultaneously at the telephoto end at infinity;

[0050] Figure 16 The distortion diagram of the optical lens provided in Embodiment 2 of this application when it is simultaneously at the telephoto end at infinity.

[0051] The following are the labeling elements in the figure:

[0052] Lens group 1 G1; Lens group 2 G2; Lens 1 L1; Lens 2 L2; Lens group 3 G3; Lens group 4 G4; Lens group 5 G5; Lens 1 L1; Lens 2 L2; Lens 3 L3; Lens 4 L4; Lens 5 L5; Lens 6 L6; Lens 7 L7; Lens 8 L8; Lens 9 L9; Lens 10 L10; Lens 11 L11; Lens 12 L12; Lens 13 L13; Lens 14 L14; Lens 15 L15; Stop; Protective film CG. Detailed Implementation

[0053] For ease of understanding, the English abbreviations and related technical terms used in the embodiments of this application will be explained and described below.

[0054] Focal power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam; it characterizes the ability of an optical lens to deflect light.

[0055] A lens or lens group with positive optical power, having a positive focal length, and having the effect of converging light.

[0056] A lens or lens group with negative optical power has a negative focal length and has the effect of diverging light.

[0057] Focal length, also known as focal length, is a measure of how well light converges or diverges in an optical lens. It refers to the perpendicular distance from the optical center of a lens or lens group to the focal plane when a distant object is focused into a clear image. For prime lenses, the position of their optical center remains constant; for telephoto lenses, changes in the optical center result in changes in the focal length.

[0058] The effective focal length (EFL) of a lens refers to the distance from the center of the lens to the focal point.

[0059] The combined focal length is the combination of the focal lengths of the individual lenses in a lens group.

[0060] The object side is defined by the lens; the side where the object is located is called the object side, and the surface of the lens closest to the object side is called the object side surface.

[0061] The image side is the side on which the image of the object is located, with the lens as the boundary. The surface of the lens closest to the image side is called the image side surface.

[0062] An aperture diaphragm is a device used to control the amount of light passing through the lens and entering the sensor inside the camera body; it is usually located inside the lens.

[0063] The imaging plane is located on the image side of all lenses in an optical lens, and is the surface on which light rays pass through each lens in the optical lens in sequence to form an image.

[0064] The optical axis is a vertical axis that passes through the center of a lens. The lens optical axis is the axis that passes through the centers of each lens in the lens.

[0065] The focal point is the point where parallel light rays converge after being refracted by a lens or lens group.

[0066] The Abbe number, also known as the dispersion coefficient, is the ratio of the difference in refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0067] Aberrations: Optical lenses have the properties of an ideal optical system at the optical axis, where near-axis rays emitted from a point on an object intersect the image plane at a point (i.e., the optical axis image point). However, in reality, rays passing through different apertures of the lens rarely intersect perfectly at a single point, but rather deviate from the position of the near-axis image point. These differences are collectively referred to as aberrations.

[0068] Field curvature, also known as "image field curvature," occurs when a lens exhibits field curvature. The intersection of the entire beam does not coincide with the ideal image point. Although a clear image point can be obtained at each specific point, the entire image plane is a curved surface.

[0069] Distortion, also known as image distortion, refers to the degree of distortion in the image formed by an optical lens relative to the object itself. Distortion is caused by the spherical aberration of the aperture. The height of the intersection point between the principal ray and the Gaussian image plane after passing through the optical lens in different fields of view is not equal to the ideal image height; the difference between the two is the distortion.

[0070] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0071] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0072] like Figure 1 As shown in the figure, this application embodiment provides a camera module. The camera module includes an optical lens and a photosensitive element, with the photosensitive element located on the image side of the optical lens.

[0073] The working principle of a camera module is as follows: the light reflected from the subject passes through the optical lens to generate an optical image, which is then projected onto the photosensitive surface of the photosensitive element. The photosensitive element converts the optical image into an electrical signal, i.e., an analog image signal, and transmits it to the processor.

[0074] Among them, the photosensitive element (also known as the image sensor) Figure 1 The image on the far right (IMAGE) is a semiconductor chip containing hundreds of thousands to millions of photodiodes on its surface. When illuminated, these photodiodes generate electrical charges. The photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device. A CCD is made of a highly sensitive semiconductor material that converts light into electrical charges. A charge-coupled device consists of many photosensitive units, typically measured in megapixels. When light illuminates the surface of the photosensitive element, each photosensitive unit reflects a charge onto the component. The signals generated by all the photosensitive units are added together to form a complete image.

[0075] like Figure 1 As shown, a protective film (CG) is usually provided on the photosensitive element. This serves to support and protect the photosensitive element.

[0076] Optical lenses primarily utilize the refraction principle of lenses to create images. Light from a scene passes through the optical lens, forming a clear image on the focal plane, which is then recorded by a photosensitive element located on the focal plane. These optical lenses can be, but are not limited to, industrial lenses.

[0077] like Figure 1 and Figure 2 As shown in the figure, an embodiment of this application provides an optical lens. The optical lens includes a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, and a fifth lens group G5 arranged along the object side to the image side. The first lens group G1, the third lens group G3, and the fifth lens group G5 have positive optical power, and the second lens group G2 and the fourth lens group G4 have negative optical power.

[0078] The aforementioned second lens group G2, also known as the zoom group, can move along the optical axis of the optical lens to enable the optical lens to zoom between the wide-angle end and the telephoto end.

[0079] The aforementioned fourth lens group G4, also known as the focusing group, primarily compensates for image plane shift caused by changes in object distance or the movement of the second lens group G2 by moving along the optical axis of the lens. This allows the optical lens to focus and form an image between infinity and near focus, resulting in a clear image. During the movement of the second lens group G2 and / or the fourth lens group G4, the first lens group G1, the third lens group G3, and the fifth lens group G5 remain stationary relative to the image sensor.

[0080] By rationally allocating the optical power of each lens group, aberrations can be effectively balanced, and resolving power can be improved. Using the aforementioned zoom focusing method, the optical lens can not only zoom between the wide-angle and telephoto ends (i.e., change the focal length to adjust magnification), but also, with the same air gap between the third and fifth lens groups, compared to the movement of multiple lenses, the movement of a fourth lens group with a single lens having negative optical power can not only compensate for the image plane movement during the zoom movement of the second lens group, but also adapt to image plane displacement caused by changes in object distance, thereby improving image quality. Furthermore, it relatively reduces the number and weight of lenses, and also reduces the power required to drive the movement of the fourth lens group G4, further facilitating the miniaturization, lightweighting, and fast focusing of the optical lens. In addition, the reduced number of fourth lens groups increases the range of motion of the fourth lens group G4, enabling the optical lens to achieve clear imaging over a wide range of object distances.

[0081] It should be noted that, compared to the fourth lens group which has positive optical power and is used for focusing, the fourth lens group with negative optical power is more likely to compress the overall length of the lens optics and achieve a smaller telephoto ratio.

[0082] like Figure 1 and Figure 2 The structure of an optical lens according to Embodiment 1 of this application is shown. This optical lens includes a total of 15 lenses arranged from the object side to the image side: a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, and a fifth lens group G5, and an aperture stop (STOP). The aperture stop (STOP) is located between the second lens group G2 and the third lens group G3. The first lens group G1, the third lens group G3, and the fifth lens group G5 have positive optical power; the second lens group G2 and the fourth lens group G4 have negative optical power.

[0083] The first lens group G1 includes a first lens L1 and a second lens L2, which are cemented together to form a cemented lens.

[0084] The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The fifth lens L5 and the sixth lens L6 are cemented together to form a cemented lens.

[0085] The third lens group G3 includes the seventh lens L7, the eighth lens L8, and the ninth lens L9; the eighth lens L8 and the ninth lens L9 are cemented together to form a cemented lens.

[0086] The fourth lens group G4 includes the tenth lens L10.

[0087] The fifth lens group G5 includes the eleventh lens L11; the twelfth lens L12; the thirteenth lens L13; the fourteenth lens L14 and the fifteenth lens L15; the twelfth lens L12 and the thirteenth lens L13 are cemented together to form a cemented lens.

[0088] The second lens group G2 can move along the optical axis of the optical lens to enable the optical lens to zoom between the wide-angle end and the telephoto end; the fourth lens group G4 can move along the optical axis of the optical lens to compensate for the image plane displacement caused by the change in object distance or the movement of the second lens group G2, so that the optical lens can focus and image between infinity and near focus. At the same time, the first lens group G1, the third lens group G3 and the fifth lens group G5 remain stationary relative to the photosensitive element.

[0089] Tables 1a to 1g respectively provide the specific parameter values ​​of each lens of the optical lens in an optional embodiment of Embodiment 1 of this application.

[0090] Table 1a

[0091] Face number Surface type R value thickness Refractive index Abbe number Page 1 spherical 32.34 1.20 2.00 25.43 Page 2 spherical 20.60 5.22 1.74 49.22 Page 3 spherical flat D3 Page 4 aspherical 45.40 1.80 1.85 40.10 Page 5 aspherical 19.21 1.59 Page 6 spherical 69.99 2.04 1.85 23.78 Page 7 spherical -164.71 1.78 8 spherical -20.07 0.76 1.88 39.22 9 spherical 26.24 1.83 1.92 20.88 10 spherical flat D10 Stop spherical flat 0.26 12 aspherical 23.35 2.86 1.59 61.25 Page 13 aspherical -61.89 0.26 Page 14 spherical 15.90 1.26 1.92 20.88 15 spherical 11.69 4.61 1.50 81.61 Page 16 spherical -21.76 D16 Page 17 spherical -187.35 0.76 1.88 39.22 18 spherical 16.15 D18 19 spherical 42.91 3.72 1.70 30.05 20 spherical -18.53 4.53 Page 21 spherical -17.85 0.79 1.88 39.22 22 spherical 53.98 2.51 1.70 30.05 Page 23 spherical -59.41 3.28 24 spherical -12.57 0.78 1.88 39.22 25 spherical -62.60 0.15 Page 26 spherical 50.73 5.11 1.50 81.61 Page 27 spherical -50.73 15.64 28 spherical flat 0.85 1.52 64.20 29 spherical flat 0.5 IMAGE spherical flat -

[0092] It should be noted that in Table 1a, "Surface Number" refers to the number of each surface arranged sequentially from the object side to the image side. The radius R value is the lens corresponding to the surface number, that is, the radius of curvature of the object side or image side of the lens corresponding to each surface number at the optical axis. "Infinite" in the "Radius of Curvature" parameter series means that the object side or image side of the lens is a plane. The first value in the "Thickness / Spacing" parameter series for each lens is the thickness of the lens on the optical axis, and the second value is the distance on the optical axis from the image side of the lens to the object side of the next lens. The value of the stop in the "Thickness" parameter series is the distance on the optical axis from the center of the stop to the object side of the next lens. The value of the second to last surface number in the surface number series, for example, "Surface 28" in this embodiment, corresponds to the thickness of the protective film CG in the optical lens. "IMAGE" corresponds to the imaging plane of the optical lens, which in this embodiment refers to the image plane of the lens. Figure 1 The rightmost imaging plane of the optical lens shown.

[0093] When the optical lens zooms between the wide-angle and telephoto ends, and focuses between infinity and near focus, the values ​​“D3”, “D10”, “D16”, and “D18” in Table 1a represent the changes in thickness. Specifically, the parameters “D3”, “D10”, “D16”, and “D18” are referenced in Table 1b.

[0094] Table 1b

[0095] Wide-angle end Observation Depth Wide-angle end Observation Depth D0 (object distance) Infinity Infinity Near the focal point (1m) Near the focal point (1m) D3(mm) 0.49 12.35 0.49 12.35 D10 (mm) 12.65 0.79 12.65 0.79 D16 (mm) 0.50 0.30 0.71 1.01 D18 (mm) 7.32 7.52 7.11 6.81

[0096] In this embodiment, the lenses at the 3rd and 7th positions along the object side to the image side, i.e., as shown in this embodiment... Figure 1 The third lens L3 and the seventh lens L7 in the diagram are aspherical lenses. That is, both the object-side surface and the image-side surface of the third lens L3 and the seventh lens L7 are aspherical, as shown in "Surface 4", "Surface 5", "Surface 12" and "Surface 13" in Figure 1a. Using aspherical surfaces in these positions can effectively reduce the aberrations of optical lenses, especially spherical aberration.

[0097] The aspherical surface shape of the above aspherical lens satisfies the following conditions:

[0098]

[0099] Where c is the curvature corresponding to the radius of curvature R, y is the radial coordinate (its unit is the same as the lens length unit), k is the conic coefficient (when k is less than -1, the surface curve is a hyperbola; when k is equal to -1, it is a parabola; when k is between -1 and 0, it is an ellipse; when k is equal to 0, it is a circle; and when k is greater than 0, it is an oval), and A4, A6, A8, A10, A12, A14, and A16 are higher-order aspheric coefficients. The definition of aspheric surface shape will not be elaborated further below.

[0100] In the embodiment, “Surface 4”, “Surface 5”, “Surface 12” and “Surface 13” in Table 1a are aspherical surfaces, and Table 1c below shows the conic coefficient and higher-order aspherical coefficient of the aspherical lens in this embodiment.

[0101] Table 1c

[0102] Face number k A4 A6 A8 Page 4 -17.75 -1.28E-07 5.49E-07 -3.51E-09 Page 5 -15.24 2.14E-04 -3.02E-06 4.97E-08 12 2.66 -8.08E-05 -5.54E-07 2.14E-09 Page 13 -3.15 1.39E-05 -3.39E-07 3.95E-09 Face number A10 A12 A14 A16 Page 7 1.60E-11 2.36E-14 0 0 8 -4.87E-10 2.36E-12 0 0 12 -2.05E-10 -4.06E-13 0 0 Page 13 -2.23E-10 -5.55E-14 0 0

[0103] The optical parameters of the optical lens in this embodiment are shown in Table 1d below.

[0104] Table 1d

[0105]

[0106] The parameters of the optical lens in Example 1 satisfy the relationship shown in Table 1e.

[0107] Table 1e

[0108] Relationship (ft / Fnot) / H OAL1 / f1 |S2 / f2| numerical values 1.008 0.120 0.612 Relationship f3 / ft f4 / f2 OAL5 / ft numerical values 0.139 0.862 0.213

[0109] Note: The following annotations explain the relationships between the optical lenses in the various embodiments:

[0110] S is the maximum displacement of the first lens group G1 along the optical axis of the optical lens between infinity and near-focus.

[0111] ft is the effective focal length of the optical lens at the telephoto end at infinity;

[0112] Fnot is the aperture value of the optical lens at the telephoto end at infinity;

[0113] H is the half-image height of the optical lens;

[0114] TTL stands for Total Optical Length of the Lens.

[0115] OAL1 is the optical length of the first lens group G1;

[0116] OAL5 is the optical length of the fifth lens group G5;

[0117] f1 is the combined focal length of the first lens group G1;

[0118] f2 is the combined focal length of the second lens group G2;

[0119] f3 is the combined focal length of the third lens group G3;

[0120] f4 is the combined focal length of the fourth lens group G4;

[0121] S2 is the displacement on the optical axis of the second lens group G2 when zooming between the wide-angle end and the telephoto end.

[0122] The positive and negative values ​​of the optical power of each lens in the optical lens of Example 1 are shown in Table 1f.

[0123] Table 1f

[0124]

[0125] It should be noted that the "+" and "-" in Table 1f represent the positive and negative optical power of each lens in the optical lens of Example 1. "+" indicates that the lens has positive optical power; "-" indicates that the lens has negative optical power.

[0126] The concavity or convexity of the object side or image side of each lens in the optical lens of Embodiment 1 at the optical axis is shown in Table 1g.

[0127] Table 1g

[0128]

[0129] It should be noted that in Table 1g, “++”, “+-”, “-+”, “--”, and “∞+” represent the concavity or convexity of the object-side or image-side of each lens at the optical axis. Specifically, “++” indicates that both the object-side and image-side of the lens are convex towards the object at the optical axis; “+-” indicates that the object-side of the lens is convex towards the object at the optical axis, while the image-side is concave towards the object at the optical axis, i.e., a biconvex structure; “-+” indicates that the object-side of the lens is concave towards the object at the optical axis, while the image-side is convex towards the object at the optical axis, i.e., a biconcave structure; “--” indicates that both the object-side and image-side of the lens are concave towards the object at the optical axis; and “∞+” indicates that the object-side of the lens is flat at the optical axis, while the image-side is convex towards the object at the optical axis.

[0130] Of course, in addition to the concave and convex shapes mentioned above, the lenses in an optical lens can also include any one or more of "∞-", "-∞", "∞+", and "+∞". Among them, "∞-" represents a lens whose object-side surface is flat at the optical axis and whose image-side surface is concave towards the object at the optical axis; "-∞" represents a lens whose object-side surface is concave towards the object at the optical axis and whose image-side surface is flat at the optical axis; "+∞" represents a lens whose object-side surface is convex towards the object at the optical axis and whose image-side surface is flat at the optical axis; no specific limitation is made here.

[0131] Figure 1 This diagram shows the structure of the optical lens in Embodiment 1 when it is simultaneously at the wide-angle end at infinity. Figure 2 The diagram shows the structure of the optical lens of Example 1 at infinity and simultaneously at the telephoto end, and Tables 1a to 1g show that the main parameters of the optical lens in Example 1 satisfy the relationship in Table 1e, as well as the concavity and convexity of each lens at the optical axis. Simulations were used to obtain the axial aberration diagram, field curvature diagram, and distortion diagram of the image formed by the optical lens of Example 1 at infinity and simultaneously at the wide-angle end, as shown below. Figures 3-5 As shown, simulation diagrams of axial aberration, field curvature, and distortion when the optical lens is simultaneously at the telephoto end at infinity are displayed. Figures 6-8 As shown.

[0132] The axial aberration diagram above represents the axial aberration of an optical lens as the aperture changes. The three curves correspond to the axial aberrations obtained under three different wavelengths of light: 0.486 μm, 0.587 μm, and 0.656 μm. The horizontal axis represents the axial aberration value, and the vertical axis represents the normalized aperture. In the field of optical imaging, the aberration value at 0.707 μm aperture is typically used to reflect the image quality of the photographed object.

[0133] The field curvature diagram above shows the field curvature value of an optical lens as the field of view changes. The horizontal axis represents the magnitude of the field curvature, and the vertical axis represents the normalized field height. The solid line represents the meridional direction, and the dashed line represents the sagittal direction. In the field of optical imaging, the field curvature value within the 0.8–0.9 field of view is typically used to determine the resolving power of an optical lens.

[0134] The distortion graph above represents the percentage distortion of the optical lens as the field of view changes, where the horizontal axis represents the percentage distortion and the vertical axis represents the normalized field of view height.

[0135] The above descriptions of the axial aberration map, field curvature map, and distortion map are the same as those in other embodiments, and will not be repeated below.

[0136] As can be seen from the above figures, all aberrations in Example 1 were well corrected, and the system exhibited excellent optical performance.

[0137] Figure 9 This diagram shows the structure of the optical lens in Embodiment 2 when it is simultaneously at the wide-angle end at infinity. Figure 10 A structural diagram of the optical lens of Embodiment 2 when it is simultaneously at the telephoto end at infinity is shown. The main difference between the optical lens of Embodiment 2 and the optical lens of Embodiment 1 is that the optical lens includes 14 lenses, wherein the fifth lens group G5 in the second lens group G2 has one fewer lens than in Embodiment 1, and the fifth lens group G5 does not include cemented lenses; at the same time, the parameters and conditions satisfied by each lens in the optical lens are different, as are the concavity and convexity of the object side or image side of each lens at the optical axis.

[0138] like Figure 9 and Figure 10 As shown, the optical lens comprises 14 lenses arranged from the object side to the image side: a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, and a fifth lens group G5, as well as an aperture stop (STOP). The aperture stop is located between the second lens group G2 and the third lens group G3. The first lens group G1, the third lens group G3, and the fifth lens group G5 have positive optical power; the second lens group G2 and the fourth lens group G4 have negative optical power.

[0139] The first lens group G1 includes a first lens L1 and a second lens L2, which are cemented together to form a cemented lens.

[0140] The second lens group G2 includes a third lens L3, a fourth lens L4, and a fifth lens L5. The fifth lens L5 and the sixth lens L6 are cemented together to form a cemented lens.

[0141] The third lens group G3 includes the seventh lens L7, the eighth lens L8, and the ninth lens L9; the eighth lens L8 and the ninth lens L9 are cemented together to form a cemented lens.

[0142] The fourth lens group G4 includes the tenth lens L10.

[0143] The fifth lens group G5 includes the eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, and the fourteenth lens L14.

[0144] The zoom and focus movement of the optical lens in this embodiment is the same as that of the optical lens in the previous embodiment, and will not be described again here.

[0145] Tables 2a to 2g respectively provide the specific parameter values ​​of each lens of the optical lens in an optional embodiment of Embodiment 2 of this application.

[0146] Table 2a

[0147] Face number Surface type R value thickness Refractive index Abbe number Page 1 spherical 31.45 1.20 2.00 25.43 Page 2 spherical 21.56 5.69 1.74 49.22 Page 3 spherical -624.41 D3 Page 4 aspherical 79.64 1.80 1.85 40.10 Page 5 aspherical 27.64 1.43 Page 6 spherical 98.46 1.97 1.85 23.78 Page 7 spherical -98.46 1.75 8 spherical -21.31 0.78 1.88 39.22 9 spherical 34.72 1.72 1.92 20.88 10 spherical 388.32 D10 Aperture spherical flat 0.15 12 aspherical 22.46 2.64 1.59 61.25 Page 13 aspherical -75.20 0.14 Page 14 spherical 15.27 1.27 1.92 20.88 15 spherical 11.17 4.72 1.50 81.61 Page 16 spherical -19.97 D16 Page 17 spherical flat 0.77 1.88 39.22 18 spherical 14.52 D18 19 spherical 44.31 3.31 1.70 30.05 20 spherical -17.49 2.41 Page 21 spherical 17.49 0.79 1.88 39.22 22 spherical 122.53 6.54 Page 23 spherical -11.17 0.77 1.88 39.22 24 spherical -27.70 0.43 25 spherical 55.11 4.52 1.50 81.61 Page 26 spherical -55.11 17.24 Page 27 spherical flat 0.85 1.52 64.20 28 spherical flat 0.5 IMAGE spherical flat -

[0148] In this embodiment, the optical lens zooms between the wide-angle end and the telephoto end, and when focusing between infinity and near focus, the values ​​“D3”, “D10”, “D16”, and “D18” in Table 2a represent the changes in thickness. Specifically, the parameters “D3”, “D10”, “D16”, and “D18” are referenced in Table 2b.

[0149] Table 2b

[0150] Wide-angle end Observation Depth Wide-angle end Observation Depth D0 (object distance) Infinity Infinity Near the focal point (1m) Near the focal point (1m) D3(mm) 0.49 13.87 0.49 13.87 D10 (mm) 13.92 0.54 13.92 0.54 D16 (mm) 0.36 0.34 0.55 0.97 D18 (mm) 6.85 6.87 6.66 6.24

[0151] In this embodiment, the lenses at the 3rd and 7th positions along the object side to the image side, i.e., as in this embodiment... Figure 9 The third lens L3 and the seventh lens L7 in this embodiment are aspherical lenses. That is, both the object-side surface and the image-side surface of the third lens L3 and the seventh lens L7 are aspherical, as shown in "Surface 4", "Surface 5", "Surface 12", and "Surface 13" in Figure 2a. Using aspherical surfaces in these positions can effectively reduce lens aberrations, especially spherical aberration. Table 2c below shows the conic coefficients and higher-order aspherical coefficients of the aspherical lenses in this embodiment.

[0152] Table 2c

[0153] Face number k A4 A6 A8 Page 4 14.83 2.04E-05 1.62E-07 -4.57E-10 Page 5 -17.76 1.16E-04 -6.35E-07 5.88E-09 12 -1.33 -5.31E-05 -7.59E-07 -6.80E-09 Page 13 17.14 1.76E-05 -8.42E-07 -5.28E-09 Face number A10 A12 A14 A16 Page 7 3.13E-12 2.25E-14 0 0 8 -1.77E-11 6.65E-14 0 0 12 4.08E-11 -2.59E-12 0 0 Page 13 -1.86E-10 -3.47E-13 0 0

[0154] The optical parameters of the optical lens in Example 2 are shown in Table 2d below.

[0155] Table 2d

[0156]

[0157] The parameters of the optical lens in Example 2 satisfy the relationship shown in Table 2e.

[0158] Table 2e

[0159] Relationship (ft / Fnot) / H OAL1 / f1 |S2 / f2| numerical values 0.965 0.111 0.598 Relationship f3 / ft f4 / f2 OAL5 / ft numerical values 0.133 0.730 0.188

[0160] The positive and negative values ​​of the optical power of each lens in the optical lens of Example 2 are shown in Table 2f.

[0161] Table 2f

[0162]

[0163] It should be noted that the "+" and "-" in Table 2f represent the positive and negative optical power of each lens in the optical lens of Example 1. "+" indicates that the lens has positive optical power; "-" indicates that the lens has negative optical power.

[0164] The concavity or convexity of the object side or image side of each lens in the optical lens of Example 2 at the optical axis is shown in Table 2g.

[0165] Table 2g

[0166]

[0167] Combination Figure 9 and Figure 10 The given schematic diagram of the optical lens in Embodiment 2, and the main parameters of the optical lens in Embodiment 2 given in Tables 2a to 2g satisfy the relationship in Table 2e, as well as the concavity and convexity of each lens at the optical axis.

[0168] As can be seen from the above figures, the various aberrations in Example 2 were well corrected, and the device exhibited excellent optical performance.

[0169] It should be noted that, in addition to the 14 or 15 lenses mentioned above, the number of lenses in the optical lens can be selected by the user according to optical requirements, and can also be 11, 12, or 14, without specific limitation. Similarly, the number and placement of aspherical lenses in the optical lens, besides the two embodiments described above, can also be appropriately adjusted according to optical requirements, without specific limitation.

[0170] This is usually achieved by changing the number of lenses in the fifth lens group G5. This has less impact on the optical imaging quality of the optical lens and is more conducive to achieving both the performance and miniaturization of the optical lens.

[0171] In the two embodiments described above, the effective focal length ft, aperture Fnot, and maximum half-image height H of the optical lens when both are at the telephoto end at infinity satisfy the following relationship: 0.85≤(ft / Fnot) / H≤1.15.

[0172] The ratio (ft / Fnot) / H defines the relative size of the entrance pupil diameter. If the ratio (ft / Fnot) / H is too small, the optical lens cannot achieve a sufficient zoom ratio, meaning the zoom ratio of the zoom lens does not meet optical requirements. If the ratio (ft / Fnot) / H is too large, the entrance pupil diameter of the optical lens becomes larger, and the maximum aperture of the first lens group G1 becomes larger, resulting in an increase in the overall weight of the first lens group G1, which is detrimental to the miniaturization and weight reduction of the lens.

[0173] The optical lens mentioned above is a zoom lens. The zoom ratio, also known as the zoom magnification, refers to the ratio of the longest focal length to the shortest focal length of the zoom lens.

[0174] When the ratio (ft / Fnot) / H satisfies the above relationship, the optical lens can effectively suppress the relative size of the front end of the optical lens, which is closer to the object side, while achieving an appropriate zoom ratio, thus facilitating the miniaturization and lightening of the optical lens.

[0175] In the two embodiments described above, the optical length OAL1 of the first lens group and the combined focal length f1 of the first lens group G1 satisfy the following relationship: 0.08≤OAL1 / f1≤0.13.

[0176] If the ratio OAL1 / f1 is too small, the optical power of the first lens group G1 becomes smaller relative to the length OAL1 of the first lens G1, which weakens the ability of the first lens group G1 to refract light. This is not conducive to balancing with the optical power of the lens group closer to the image side of the optical lens, that is, the aberrations of the optical lens cannot be well balanced, resulting in poor resolution. If the ratio OAL1 / f1 is too large, the length OAL1 of the first lens G1 will become longer relative to the focal length, which will make it more difficult to compress the size of the optical lens, thus hindering the miniaturization of the optical lens.

[0177] When the ratio OAL1 / f1 satisfies the above relationship, the optical lens can not only effectively suppress the length of the lens and ensure the compact size requirement of the lens, but also achieve a good balance of aberrations, thereby improving the image quality.

[0178] In the two embodiments described above, the displacement S2 of the second lens group G2 on the optical axis when zooming between the wide-angle end and the telephoto end, and the combined focal length f2 of the second lens group G2, satisfy the relationship: 0.55≤|S2 / f2|≤0.65.

[0179] If the ratio S2 / f2 is too small, the zoom displacement S2 of the second lens group G2 will decrease, making it impossible for the optical lens to obtain a suitable zoom ratio; if the ratio S2 / f2 is too large, the zoom displacement S2 of the second lens group G2 will increase, and the length of the optical lens will increase accordingly, which is not conducive to the compactness and miniaturization of the optical lens.

[0180] When the ratio S2 / f2 satisfies the above relationship, the optical lens can achieve an appropriate zoom ratio while controlling the zoom displacement S2 of the second lens group G2 within an appropriate range, thus achieving both the zoom ratio and miniaturization of the optical lens.

[0181] In the two embodiments described above, the combined focal length f2 of the second lens group G2 and the combined focal length f4 of the fourth lens group G4 satisfy the relationship: 0.65≤f4 / f2≤0.95.

[0182] If the ratio f4 / f2 is too small, the optical power of the fourth lens group G4 will be enhanced compared to the second lens group G2, making it difficult to correct aberrations such as spherical aberration and image plane curvature. If the ratio f4 / f2 is too large, the optical power of the fourth lens group G4 will be weakened compared to the second lens group G2, and the aperture of the lens in the fourth lens group G4, namely the tenth lens L10, will become larger, thus increasing the weight. At the same time, as the focusing group, the maximum focusing displacement of the fourth lens group G4 will also increase, which is also not conducive to compressing the length of the optical lens.

[0183] When the ratio f4 / f2 satisfies the above relationship, the optical lens can better correct various aberrations such as spherical aberration and image plane curvature, and it is also conducive to the compactness of the lens.

[0184] In the two embodiments described above, when the optical lens is at infinity, the effective focal length ft of the optical lens at the telephoto end and the combined focal length f3 of the third lens group G3 satisfy the following relationship: 0.11≤f3 / ft≤0.15.

[0185] If the ratio f3 / ft is too small, the optical power of the third lens group G3 will be enhanced, making it difficult to correct aberrations such as spherical aberration and image plane curvature. If the ratio f3 / ft is too large, the optical power of the third lens group G3 will be weakened, the air gap between the third lens group G3 and the fourth lens group G4 will increase, and the overall length of the optical lens will also increase accordingly, which is not conducive to achieving a compact size.

[0186] When the ratio f3 / ft satisfies the above relationship, the optical power of the third lens group G3 can be kept within a suitable range to better correct various aberrations such as spherical aberration and image plane curvature, while also being conducive to the compactness of optical lenses.

[0187] In the two embodiments described above, when the optical lens is at infinity, the effective focal length ft of the optical lens at the telephoto end and the optical length OAL5 of the fifth lens group G5 satisfy the following relationship: 0.16≤OAL5 / ft≤0.24.

[0188] If the ratio OAL5 / ft is too small, the optical length of the fifth lens group G5 will decrease, making it more difficult to correct aberrations such as spherical aberration, coma, and field curvature. If the ratio OAL5 / ft is too large, the length of the fifth lens group G5 will increase relative to the effective focal length ft of the optical lens at the telephoto end, which is not conducive to the compactness and miniaturization of the optical lens.

[0189] When the ratio OAL5 / ft satisfies the above relationship, the optical lens can better correct aberrations such as spherical aberration, coma, and field curvature, thereby improving image quality, while ensuring that the length of the fifth lens group G5 is within a suitable range.

[0190] In summary, the optical lens in this embodiment has a focusing range between 1 meter near-focus and infinity, achieving full-frame display while simultaneously achieving miniaturization, lightweight design, and high image quality. The aforementioned optical lens and camera module can be mounted on an aerial drone for video recording, achieving both full-frame display and a lightweight drone.

[0191] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An optical lens, characterized in that, It consists of 14 lenses arranged from the object side to the image side: a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group. The first lens group, the third lens group, and the fifth lens group have positive optical power, while the second lens group and the fourth lens group have negative optical power. The first lens group consists of a first lens and a second lens arranged from the object side to the image side; The third, fourth, fifth, and sixth lenses, arranged from the object side to the image side, constitute the second lens group; The seventh, eighth, and ninth lenses, arranged from the object side to the image side, constitute the third lens group; The tenth lens constitutes the fourth lens group; The eleventh, twelfth, thirteenth, and fourteenth lenses arranged from the object side to the image side constitute the fifth lens group; the first, third, fifth, eighth, tenth, twelfth, and thirteenth lenses all have negative optical power, while the second, fourth, sixth, seventh, ninth, eleventh, and fourteenth lenses all have positive optical power; The second lens group can move along the optical axis of the optical lens to enable the optical lens to zoom between the wide-angle end and the telephoto end; The fourth lens group can move along the optical axis of the optical lens so that the optical lens can focus and image between infinity and near focus. When the optical lens is at infinity, the effective focal length ft, aperture Fnot, and maximum half-image height H of the optical lens at the telephoto end satisfy the following relationship: 0.85 ≤ (ft / Fnot) / H ≤ 1.

15.

2. An optical lens, characterized in that, It consists of 15 lenses arranged from the object side to the image side: a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group. The first lens group, the third lens group, and the fifth lens group have positive optical power, while the second lens group and the fourth lens group have negative optical power. The first lens group consists of a first lens and a second lens arranged from the object side to the image side; The third, fourth, fifth, and sixth lenses, arranged from the object side to the image side, constitute the second lens group; The seventh, eighth, and ninth lenses, arranged from the object side to the image side, constitute the third lens group; The tenth lens constitutes the fourth lens group; The eleventh, twelfth, thirteenth, fourteenth, and fifteenth lenses, arranged from the object side to the image side, constitute the fifth lens group; the first, third, fifth, eighth, tenth, twelfth, and fourteenth lenses all have negative optical power, while the second, fourth, sixth, seventh, ninth, eleventh, thirteenth, and fifteenth lenses all have positive optical power; The second lens group can move along the optical axis of the optical lens to enable the optical lens to zoom between the wide-angle end and the telephoto end; The fourth lens group can move along the optical axis of the optical lens so that the optical lens can focus and image between infinity and near focus. When the optical lens is at infinity, the effective focal length ft, aperture Fnot, and maximum half-image height H of the optical lens at the telephoto end satisfy the following relationship: 0.85 ≤ (ft / Fnot) / H ≤ 1.

15.

3. The optical lens according to claim 1 or 2, characterized in that, The optical length OAL1 of the first lens group and the combined focal length f1 of the first lens group satisfy the following relationship: 0.08 ≤ OAL1 / f1 ≤ 0.

13.

4. The optical lens according to claim 1 or 2, characterized in that, The displacement S2 of the second lens group G2 on the optical axis when zooming between the wide-angle end and the telephoto end, and the combined focal length f2 of the second lens group satisfy the following relationship: 0.55 ≤ |S2 / f2| ≤ 0.

65.

5. The optical lens according to claim 1 or 2, characterized in that, When the optical lens is at infinity, the effective focal length ft of the optical lens at the telephoto end and the combined focal length f3 of the third lens group satisfy the following relationship: 0.11≤f3 / ft≤0.

15.

6. The optical lens according to claim 1 or 2, characterized in that, The combined focal length f2 of the second lens group and the combined focal length f4 of the fourth lens group satisfy the following relationship: 0.65≤f4 / f2≤0.

95.

7. The optical lens according to claim 1 or 2, characterized in that, When the optical lens is at infinity, the effective focal length ft of the optical lens at the telephoto end satisfies the following relationship with the optical length OAL5 of the fifth lens group: 0.16≤OAL5 / ft≤0.

24.

8. A camera module, characterized in that, include: The optical lens according to any one of claims 3 to 7; A photosensitive element is disposed on the image side of the optical lens.

Images