A zoom lens

Abstract

The application discloses a zoom lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group in sequence from the object side to the image side along the optical axis, wherein the first lens group is a fixed group with positive refractive power; the second lens group is a zoom group with negative refractive power; the third lens group is a fixed group with positive refractive power, comprising an eighth lens and a ninth lens arranged in sequence from the object side to the image side along the optical axis; the fourth lens group is a focus group with positive refractive power; and the fifth lens group is a fixed group with positive refractive power, comprising a thirteenth lens and a fourteenth lens arranged in sequence from the object side to the image side along the optical axis.

Description

Technical Field

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

[0002] In recent years, optical lens technology has developed rapidly, and optical lenses are being widely used in an increasing number of fields. Currently, with the continuous upgrading and development of internet technology, video lenses are widely used in video conferencing, online teaching, and online video shooting, and have received increasing attention from the public. Video zoom lenses can continuously adjust the lens's focal length and field of view, and can more realistically reproduce the details of objects in different scenarios, meeting users' shooting requirements in different situations.

[0003] With the development of technology, users have placed higher demands on the imaging quality and applicable scenarios of lenses. High imaging quality, high magnification, wide field of view, and low distortion are the current development trends of zoom lenses. However, zoom lenses on the market today still have many shortcomings, such as: the lens configuration of existing video zoom lenses often makes it difficult to effectively correct system aberrations, resulting in poor image quality; existing video zoom lenses pursue high pixel count and a wide angle at the wide end, but this often results in excessively large lens size and optical length, making it difficult to meet miniaturization requirements; existing video zoom lenses generally cannot simultaneously meet the three characteristics of high imaging quality, high magnification, and a wide field of view at the wide end; and, while ensuring a wide field of view at the wide end, existing video zoom lenses often fail to meet the requirement of low optical distortion, resulting in obvious distortion in the captured image and affecting post-processing.

[0004] Therefore, given the current state of zoom lens development, zoom lenses with a large field of view (wide-angle end), large zoom ratio, low distortion, and high resolution are among the current market demands. Summary of the Invention

[0005] This application provides a zoom lens that may sequentially include a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group along the optical axis from the object side to the image side. The first lens group is a fixed group with positive optical power; the second lens group is a zoom group with negative optical power; the third lens group, a fixed group with positive optical power, includes an eighth lens and a ninth lens arranged sequentially along the optical axis from the object side to the image side; the fourth lens group is a focusing group with positive optical power; and the fifth lens group, a fixed group with positive optical power, includes a thirteenth lens and a fourteenth lens arranged sequentially along the optical axis from the object side to the image side.

[0006] In one embodiment, the first lens group includes a first lens, a second lens, and a third lens arranged sequentially from the object side to the image side along the optical axis, wherein the first lens has negative optical power; the second lens has positive optical power; and the third lens has positive optical power.

[0007] In one embodiment, the object-side surface of the first lens is convex and the image-side surface is concave; the object-side surface of the second lens is convex and the image-side surface is convex; and the object-side surface of the third lens is convex and the image-side surface is concave.

[0008] In one embodiment, the first lens and the second lens are cemented together to form a first cemented lens.

[0009] In one embodiment, the second lens group includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side to the image side along the optical axis, wherein the fourth lens has negative optical power; the fifth lens has negative optical power; the sixth lens has negative optical power; and the seventh lens has positive optical power.

[0010] In one embodiment, the sixth lens and the seventh lens are cemented together to form a second cemented lens.

[0011] In one embodiment, the eighth lens has positive optical power; and the ninth lens has negative optical power.

[0012] In one embodiment, the fourth lens group includes a tenth lens, an eleventh lens, and a twelfth lens arranged sequentially from the object side to the image side along the optical axis, wherein the tenth lens has positive optical power; the eleventh lens has positive optical power; and the twelfth lens has negative optical power.

[0013] In one embodiment, the object-side surface of the eleventh lens is convex, and the image-side surface is convex; and the object-side surface of the twelfth lens is concave, and the image-side surface is concave.

[0014] In one embodiment, the eleventh lens and the twelfth lens are cemented together to form a third cemented lens.

[0015] In one embodiment, the thirteenth lens has negative optical power; and the fourteenth lens has positive optical power.

[0016] In one embodiment, the object-side surface of the thirteenth lens is concave, and the image-side surface is convex; and the object-side surface of the fourteenth lens is concave.

[0017] In one embodiment, the radius of curvature R2 of the cemented surface of the first cemented lens and the effective focal length FG1 of the first lens group can satisfy: R2 / FG1≤0.67.

[0018] In one embodiment, the center thickness d of the first cemented lens on the optical axis is... 1胶合 The total optical length dG1 of the first lens group satisfies: 0.63 ≤ d 1胶合 / dG1≤0.68.

[0019] In one embodiment, the effective focal length FG1 of the first lens group and the focal length Fw of the zoom lens at the wide-angle end can satisfy: 12.93≤FG1 / Fw≤13.94.

[0020] In one embodiment, the effective focal length FG2 of the second lens group and the focal length Fw of the zoom lens at the wide-angle end can satisfy: -2.49≤FG2 / Fw≤-1.90.

[0021] In one embodiment, the effective focal length FG3 of the third lens group and the focal length Fw of the zoom lens at the wide-angle end can satisfy: 7.23≤FG3 / Fw≤7.74.

[0022] In one embodiment, the effective focal length FG4 of the fourth lens group and the focal length Fw of the zoom lens at the wide-angle end can satisfy: 6.02≤FG4 / Fw≤6.77.

[0023] In one embodiment, the effective focal length FG5 of the fifth lens group and the focal length Fw of the zoom lens at the wide-angle end can satisfy: 6.27≤FG5 / Fw≤7.40.

[0024] In one embodiment, the distance d12t between the first lens group and the second lens group on the optical axis when the zoom lens is at the telephoto end, the distance d12w between the first lens group and the second lens group on the optical axis when the zoom lens is at the wide-angle end, and the total optical length TTL of the zoom lens can satisfy: 0.3≤(d12t-d12w) / TTL≤0.36.

[0025] In one embodiment, the distance d45t between the fourth lens group and the fifth lens group on the optical axis when the zoom lens is at the telephoto end, the distance d45w between the fourth lens group and the fifth lens group on the optical axis when the zoom lens is at the wide-angle end, and the total optical length TTL of the zoom lens can satisfy: 0.05≤(d45t-d45w) / TTL≤0.14.

[0026] In one embodiment, the distance d12t between the first lens group and the second lens group on the optical axis when the zoom lens is at the telephoto end, the distance d12w between the first lens group and the second lens group on the optical axis when the zoom lens is at the wide-angle end, the distance d45t between the fourth lens group and the fifth lens group on the optical axis when the zoom lens is at the telephoto end, and the distance d45w between the fourth lens group and the fifth lens group on the optical axis when the zoom lens is at the wide-angle end can satisfy: 2.06≤(d12t-d12w) / (d45t-d45w)≤5.77.

[0027] In one embodiment, the Abbe number Vd6 of the sixth lens and the Abbe number Vd7 of the seventh lens can satisfy: Vd6-Vd7≥50.

[0028] In one embodiment, the Abbe number Vd11 of the eleventh lens and the Abbe number Vd12 of the twelfth lens can satisfy: Vd11-Vd12≥29.

[0029] In one embodiment, the effective focal length F11 of the eleventh lens and the effective focal length F12 of the twelfth lens can satisfy: 1.50≤|F11 / F12|≤1.88.

[0030] In one embodiment, the focal length Ft of the zoom lens at the telephoto end and the focal length Fw of the zoom lens at the wide-angle end can satisfy: Ft / Fw≥10.

[0031] In one embodiment, the radius of curvature R25 of the image-side surface of the fourteenth lens and the effective focal length F14 of the fourteenth lens can satisfy: 4.42≤|R25 / F14|≤11.80.

[0032] In one embodiment, the radius of curvature R6 of the object side of the fourth lens and the radius of curvature R7 of the image side of the fourth lens can satisfy: 1.17≤(R6+R7) / (R6-R7)≤1.40.

[0033] In one embodiment, the effective focal length F4 of the fourth lens and the effective focal length FG2 of the second lens group can satisfy: 0.99≤F4 / FG2≤1.10.

[0034] In one embodiment, the radius of curvature R22 of the object side of the thirteenth lens and the radius of curvature R23 of the image side of the thirteenth lens can satisfy: 1.40≤|(R22+R23) / (R22-R23)|≤2.46.

[0035] In one embodiment, the effective focal length F13 of the thirteenth lens and the effective focal length FG5 of the fifth lens group can satisfy: -1.07≤F13 / FG5≤-0.65.

[0036] The zoom lens according to an embodiment of this application includes a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group arranged sequentially along the optical axis from the object side to the image side. The first lens group is a fixed group with positive optical power; the second lens group is a zoom group with negative optical power; the third lens group, a fixed group with positive optical power, includes an eighth and a ninth lens arranged sequentially along the optical axis from the object side to the image side; the fourth lens group is a focusing group with positive optical power; and the fifth lens group, a fixed group with positive optical power, includes a thirteenth and a fourteenth lens arranged sequentially along the optical axis from the object side to the image side. This arrangement of the zoom lens achieves at least one of the following advantages: a wide field of view (FOV_w ≥ 76°), a large zoom ratio (10x or higher), low distortion (absolute distortion DIS ≤ 4.2%), compatibility with a 1 / 2.5" sized chip, high resolution, miniaturization, high image quality, and low cost. Attached Figure Description

[0037] Other features, objects, and advantages of this application will become more apparent from the following detailed description of the embodiments, taken in conjunction with the accompanying drawings. In the drawings:

[0038] Figure 1 This is a schematic diagram of the zoom lens according to Embodiment 1 of this application;

[0039] Figure 2 This is a distortion curve diagram of the zoom lens at the wide-angle end according to Embodiment 1 of this application;

[0040] Figure 3 This is a distortion curve diagram of the zoom lens at the telephoto end according to Embodiment 1 of this application;

[0041] Figure 4 This is a schematic diagram of the zoom lens according to Embodiment 2 of this application;

[0042] Figure 5 This is a distortion curve diagram of the zoom lens at the wide-angle end according to Embodiment 2 of this application;

[0043] Figure 6 This is a distortion curve diagram of the zoom lens at the telephoto end according to Embodiment 2 of this application;

[0044] Figure 7 This is a schematic diagram of the zoom lens according to Embodiment 3 of this application;

[0045] Figure 8This is a distortion curve diagram of the zoom lens at the wide-angle end according to Embodiment 3 of this application;

[0046] Figure 9 This is a distortion curve diagram of the zoom lens at the telephoto end according to Embodiment 3 of this application;

[0047] Figure 10 This is a schematic diagram of the zoom lens according to Embodiment 4 of this application;

[0048] Figure 11 This is a distortion curve diagram of the zoom lens at the wide-angle end according to Embodiment 4 of this application; and

[0049] Figure 12 This is a distortion curve diagram of the zoom lens at the telephoto end according to Embodiment 4 of this application. Detailed Implementation

[0050] To facilitate understanding of this application, a more complete description of the application will be provided below with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0051] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0052] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0053] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging side is called the image-side surface of the lens.

[0054] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0055] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0056] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0057] The features, principles and other aspects of this application are described in detail below.

[0058] In an exemplary embodiment, the zoom lens may include a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group, wherein the first lens group is a fixed group with positive optical power; the second lens group is a zoom group with negative optical power; the third lens group, a fixed group with positive optical power, may include an eighth and a ninth lens arranged sequentially along the optical axis from the object side to the image side; the fourth lens group is a focusing group with positive optical power; and the fifth lens group, a fixed group with positive optical power, may include a thirteenth and a fourteenth lens arranged sequentially along the optical axis from the object side to the image side. The first to fifth lens groups are arranged sequentially along the optical axis from the object side to the image side.

[0059] In an exemplary embodiment, the first lens group may include at least two positive lenses and one negative lens. The first lens group has positive optical power and a fixed position relative to the image plane, which is beneficial for increasing the field of view and achieving a large field of view (FOV_w ≥ 76°) at the wide-angle end.

[0060] In an exemplary embodiment, the second lens group may include at least one positive lens and three negative lenses. The second lens group has negative optical power and is movable along the optical axis from the object side to the image side, enabling continuous zooming of the zoom lens from the wide-angle end to the telephoto end.

[0061] In an exemplary embodiment, the third lens group may include at least one positive lens and one negative lens. The third lens group has positive optical power and a fixed position relative to the image plane, which helps to suppress the trajectory of subsequent outgoing light rays, allowing the light rays to transition smoothly to the rear optical system and reducing the generation of aberrations.

[0062] In an exemplary embodiment, the fourth lens group may include at least two positive lenses and one negative lens. The fourth lens group has positive optical power and can move nonlinearly along the optical axis corresponding to the second lens group for focusing, providing image plane compensation, and enabling image plane correction to ensure the stability of the image quality of the optical system during zooming.

[0063] In an exemplary embodiment, the fifth lens group may include at least one positive lens and one negative lens. The fifth lens group has positive optical power and a fixed position relative to the image plane, which helps to suppress the incident light and match the initial light with the imaging chip CRA.

[0064] In an exemplary embodiment, the first lens group may include a first lens, a second lens, and a third lens arranged sequentially along the optical axis from the object side to the image side. The first lens may have negative optical power, with its object side being convex and its image side being concave; the second lens may have positive optical power, with both its object and image sides being convex; and the third lens may have positive optical power, with its object side being convex and its image side being concave. As the first fixed group of the optical system, the first lens group uses three lenses with negative, positive, and positive optical powers respectively. The appropriate combination of the shapes of these three lenses helps to collect incident light rays and compress the angle of the incident light rays, while further compressing the angle of the outgoing light rays. This is beneficial for reducing the aperture of subsequent lenses and facilitates aberration correction by the subsequent optical system, thereby improving the imaging quality of the optical system.

[0065] In an exemplary embodiment, the first lens group may include a first lens, a second lens, and a third lens arranged sequentially along the optical axis from the object side to the image side, wherein the first lens having negative optical power and the second lens having positive optical power can be cemented together to form a first cemented lens, which helps to correct chromatic aberration in the optical system.

[0066] In an exemplary embodiment, the second lens group may include a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object side to the image side. The fourth lens may have negative optical power; the fifth lens may have negative optical power; the sixth lens may have negative optical power; and the seventh lens may have positive optical power. As a zoom group of the optical system, the second lens group, using four lenses with negative, negative, negative, and positive optical powers respectively, facilitates the collection of light rays emitted from the first lens group of the optical system, allowing the light to transition smoothly to the rear of the optical system.

[0067] In an exemplary embodiment, the second lens group may include a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object side to the image side, each having negative, negative, negative, and positive optical powers, respectively. The fifth lens may be an aspherical lens. As an aspherical lens, the fifth lens can effectively correct field curvature and spherical aberration generated in front of the optical system, while also correcting optical distortion.

[0068] In an exemplary embodiment, the second lens group may include a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object side to the image side, each having negative, negative, negative, and positive optical powers, respectively. The sixth and seventh lenses may be cemented together to form a second cemented lens. Cementing the sixth and seventh lenses together helps correct chromatic aberration in the optical system and improves color reproduction.

[0069] In an exemplary embodiment, the third lens group may include an eighth lens and a ninth lens arranged sequentially along the optical axis from the object side to the image side. The eighth lens may have positive optical power, and the ninth lens may have negative optical power, with its image-side surface being concave. As the second fixed group of the optical system, the third lens group, employing a combination of two lenses with positive and negative optical powers respectively, facilitates the adjustment of the light angle, allowing the light to smoothly transition to the rear optical system. Simultaneously, the concave image-side surface of the ninth lens, combined with the positive and negative optical power, helps correct spherical aberration introduced by the front optical system, thereby improving the resolving power of the optical system.

[0070] In an exemplary embodiment, the fourth lens group may include a tenth lens, an eleventh lens, and a twelfth lens arranged sequentially along the optical axis from the object side to the image side, wherein the tenth lens may have positive optical power; the eleventh lens may have positive optical power; and the twelfth lens may have negative optical power. As the focusing group of the optical system, the fourth lens group, employing three lenses with positive, positive, and negative optical powers respectively, can help improve focusing efficiency.

[0071] In an exemplary embodiment, the fourth lens group may include a tenth lens, an eleventh lens, and a twelfth lens, arranged sequentially along the optical axis from the object side to the image side, each having positive, positive, and negative optical powers, respectively. The eleventh and twelfth lenses can be cemented together to form a third cemented lens. The object side and image side of the eleventh lens can both be convex; the object side and image side of the twelfth lens can both be concave. Cementing the eleventh and twelfth lenses facilitates chromatic aberration correction; simultaneously, the combination of the convex-convex eleventh lens and the concave-concave twelfth lens effectively controls the light path, meeting the image size requirements.

[0072] In an exemplary embodiment, the fifth lens group may include a thirteenth lens and a fourteenth lens arranged sequentially along the optical axis from the object side to the image side. The thirteenth lens may have negative optical power, its object side may be concave, and its image side may be convex; the thirteenth lens may be an aspherical lens. The fourteenth lens may have positive optical power, and its object side may be concave. As the third fixed group of the optical system, the fifth lens group uses a combination of two lenses with positive and negative optical powers respectively. The thirteenth lens is an aspherical lens, which can effectively correct various aberrations generated by the optical system, such as astigmatism, coma, and spherical aberration, greatly improving the imaging performance of the optical system. It can also effectively correct optical distortion, ensuring that the absolute value of the distortion (DIS) of the zoom lens throughout its range is ≤4.2%, reducing the degree of image distortion and effectively restoring the realism of the photographed object. The fourteenth lens has positive optical power and a concave object side, which can effectively control the trajectory of the outgoing light rays, allowing the light to enter the imaging plane at a suitable angle, thus improving the imaging quality of the optical system.

[0073] In an exemplary embodiment, the zoom lens according to this application may further include an aperture stop, which may be located, for example, between the second lens group and the third lens group. Specifically, the aperture stop may be located, for example, between the seventh lens and the eighth lens. It should be noted that the location of the aperture stop disclosed herein is merely an example and not a limitation; in alternative embodiments, the aperture stop may be set in other locations as needed.

[0074] In an exemplary embodiment, the zoom lens may further include a photosensitive element disposed on the imaging surface. Optionally, the photosensitive element disposed on the imaging surface may be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS).

[0075] In an exemplary embodiment, the fifth lens in the second lens group and the thirteenth lens in the fifth lens group can be plastic aspherical lenses; the eighth lens in the third lens group can be a glass aspherical lens; and the remaining lenses in the first to fifth lens groups can be glass spherical lenses. By using a hybrid glass-plastic combination for the lenses included in the zoom lens, it is beneficial to reduce costs. At the same time, it can overcome the difficulty of focus drift caused by the large coefficient of thermal expansion of plastic aspherical lenses in high and low temperature environments, which is conducive to achieving non-defocusing within a temperature range of -40℃ to 80℃, thus meeting the requirements for lens use in high and low temperature environments.

[0076] In an exemplary embodiment, the first and second lenses in the first lens group can be cemented together to form a cemented doublet lens. This facilitates control of light trajectory, allowing large-angle incident light rays to converge into the optical system, effectively expanding the field of view of the optical system and ensuring that the field of view at the wide-angle end meets FOV_w ≥ 76°. Simultaneously, it effectively corrects system chromatic aberration, improves purple fringing, and significantly enhances image quality. The sixth and seventh lenses in the second lens group can be cemented together to form a cemented doublet lens, which facilitates chromatic aberration correction and controls the light deflection angle during zooming, ensuring image quality at each focal length. The eleventh and twelfth lenses in the fourth lens group can be cemented together to form a cemented doublet lens, which facilitates control of light trajectory, ensuring a smooth light transition and that the final outgoing light meets the image size requirements. It also helps correct chromatic aberration and improves image quality.

[0077] According to an exemplary embodiment of this application, the zoom lens consists of five lens groups, namely the first to fifth, with optical powers of positive, negative, positive, positive, and positive, and an aperture stop. The first, third, and fifth lens groups are fixed groups, the second lens group is a zoom group, and the fourth lens group is a focus group. By moving the zoom group and the focus group, the system zoom ratio can reach 10X or higher.

[0078] A zoom lens according to an exemplary embodiment of this application includes a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group arranged sequentially along the optical axis from the object side to the image side. The first lens group is a fixed group with positive optical power; the second lens group is a zoom group with negative optical power; the third lens group is a fixed group with positive optical power, including an eighth and a ninth lens arranged sequentially along the optical axis from the object side to the image side; the fourth lens group is a focusing group with positive optical power; and the fifth lens group is a fixed group with positive optical power, including a thirteenth and a fourteenth lens arranged sequentially along the optical axis from the object side to the image side. By setting up the zoom lens in this way, the zoom lens can achieve at least one of the following beneficial effects: wide field of view (FOV_w≥76°), large zoom ratio (10x and above), low distortion (absolute value of DIS distortion ≤4.2% throughout the zoom range), compatibility with 1 / 2.5" size chips, high resolution, miniaturization, high image quality, and low cost.

[0079] In an exemplary embodiment, the zoom lens according to this application satisfies: R2 / FG1 ≤ 0.67, where R2 is the radius of curvature of the cementing surface of the cemented doublet formed by the first lens and the second lens in the first lens group, and FG1 is the effective focal length of the first lens group. By controlling the ratio of the radius of curvature of the cementing surface of the cemented doublet formed by the first lens and the second lens in the first lens group to the effective focal length of the first lens group within this range, it is beneficial to converge large-angle incident light rays into the optical system, effectively expanding the field of view of the optical system, so that the field of view at the wide-angle end satisfies FOV_w ≥ 76°. At the same time, it is also beneficial to limit the aperture of the first lens and the second lens, making the optical system more miniaturized.

[0080] In an exemplary embodiment, the zoom lens according to this application satisfies: 0.63 ≤ d 1胶合 / dG1≤0.68, where d 1胶合 dG1 is the center thickness of the cemented doublet formed by the first and second lenses in the first lens group along the optical axis, and dG1 is the total optical length of the first lens group (the distance along the optical axis from the object side of the first lens to the image side of the third lens). By controlling the ratio of the center thickness of the cemented doublet formed by the first and second lenses in the first lens group to the total optical length of the first lens group within this range, the cemented doublet in the first lens group has a reasonable thickness value, which is beneficial for collecting light rays incident at large angles and ensuring a smooth transition of light rays to the rear optical system.

[0081] In an exemplary embodiment, the zoom lens according to this application satisfies: 12.93 ≤ FG1 / Fw ≤ 13.94, where FG1 is the effective focal length of the first lens group and Fw is the focal length of the zoom lens at the wide-angle end. By controlling the ratio of the effective focal length of the first lens group to the focal length of the zoom lens at the wide-angle end within this range, it is beneficial for the optical system to correct aberrations, improve the imaging quality of the optical system, and effectively balance optical distortion.

[0082] In an exemplary embodiment, the zoom lens according to this application satisfies: -2.49 ≤ FG2 / Fw ≤ -1.90, where FG2 is the effective focal length of the second lens group and Fw is the focal length of the zoom lens at the wide-angle end. By controlling the ratio of the effective focal length of the second lens group to the focal length of the zoom lens at the wide-angle end within this range, it is beneficial to achieve reasonable aberration distribution and high image quality.

[0083] In an exemplary embodiment, the zoom lens according to this application satisfies: 7.23 ≤ FG3 / Fw ≤ 7.74, where FG3 is the effective focal length of the third lens group and Fw is the focal length of the zoom lens at the wide-angle end. By controlling the ratio of the effective focal length of the third lens group to the focal length of the zoom lens at the wide-angle end within this range, it is beneficial for the third lens group to collect the outgoing light from the second lens group, resulting in a smoother light transition, effectively reducing aberrations, and improving optical imaging quality.

[0084] In an exemplary embodiment, the zoom lens according to this application satisfies: 6.02 ≤ FG4 / Fw ≤ 6.77, where FG4 is the effective focal length of the fourth lens group, and Fw is the focal length of the zoom lens at the wide-angle end. By controlling the ratio of the effective focal length of the fourth lens group to the focal length of the zoom lens at the wide-angle end within this range, it is beneficial to achieve reasonable aberration distribution and high image quality.

[0085] In an exemplary embodiment, the zoom lens according to this application satisfies: 6.27 ≤ FG5 / Fw ≤ 7.40, where FG5 is the effective focal length of the fifth lens group and Fw is the focal length of the zoom lens at the wide-angle end. By controlling the ratio of the effective focal length of the fifth lens group to the focal length of the zoom lens at the wide-angle end within this range, various aberrations such as astigmatism, coma, and spherical aberration generated by the optical system can be effectively corrected, greatly improving the imaging performance of the optical system. Simultaneously, optical distortion can be effectively corrected, ensuring that the absolute value of the total distortion (DIS) of the zoom lens is ≤ 4.2%, reducing the degree of image distortion and effectively restoring the realism of the photographed object.

[0086] In an exemplary embodiment, the zoom lens according to this application satisfies: 0.3 ≤ (d12t - d12w) / TTL ≤ 0.36, where d12t is the distance on the optical axis between the first lens group and the second lens group when the zoom lens is at the telephoto end, d12w is the distance on the optical axis between the first lens group and the second lens group when the zoom lens is at the wide-angle end, and TTL is the total optical length of the zoom lens (the distance on the optical axis from the object side of the first lens in the first lens group to the image plane of the lens). By reasonably controlling the travel distance of the second lens group from the wide-angle end to the telephoto end, it is beneficial to improve zoom efficiency, make the zoom response faster, and improve zoom sensitivity.

[0087] In an exemplary embodiment, the zoom lens according to this application satisfies: 0.05 ≤ (d45t - d45w) / TTL ≤ 0.14, where d45t is the distance on the optical axis between the fourth and fifth lens groups when the zoom lens is at the telephoto end, d45w is the distance on the optical axis between the fourth and fifth lens groups when the zoom lens is at the wide-angle end, and TTL is the total optical length of the zoom lens. By reasonably controlling the travel distance of the fourth lens group from the wide-angle end to the telephoto end, it is beneficial to improve focusing efficiency, make the focusing response faster, and improve focusing sensitivity.

[0088] In an exemplary embodiment, the zoom lens according to this application satisfies: 2.06 ≤ (d12t - d12w) / (d45t - d45w) ≤ 5.77, where d12t is the distance on the optical axis between the first and second lens groups when the zoom lens is at the telephoto end, d12w is the distance on the optical axis between the first and second lens groups when the zoom lens is at the wide-angle end, d45t is the distance on the optical axis between the fourth and fifth lens groups when the zoom lens is at the telephoto end, and d45w is the distance on the optical axis between the fourth and fifth lens groups when the zoom lens is at the wide-angle end. By reasonably controlling the travel distance of the second and fourth lens groups from the wide-angle end to the telephoto end, the imaging system can effectively have a large zoom ratio.

[0089] In an exemplary embodiment, the zoom lens according to this application satisfies: Vd6-Vd7≥50, where Vd6 is the Abbe number of the sixth lens and Vd7 is the Abbe number of the seventh lens. By reasonably adjusting the difference in the Abbe numbers of the two cemented lenses, the sixth and seventh lenses, within this range, chromatic aberration of the system can be effectively corrected, color reproduction can be improved, and thus image quality can be enhanced.

[0090] In an exemplary embodiment, the zoom lens according to this application can satisfy: Vd11-Vd12≥29, where Vd11 is the Abbe number of the eleventh lens and Vd12 is the Abbe number of the twelfth lens. By reasonably adjusting the difference between the Abbe numbers of the two cemented lenses, the eleventh and twelfth lenses, within this range, the chromatic aberration of the system can be effectively corrected, the color reproduction can be improved, and thus the image quality can be improved.

[0091] In an exemplary embodiment, the zoom lens according to this application satisfies the following condition: 1.50 ≤ |F11 / F12| ≤ 1.88, where F11 is the effective focal length of the eleventh lens and F12 is the effective focal length of the twelfth lens. By reasonably adjusting the absolute value of the ratio of the effective focal lengths of the two cemented lenses, the eleventh and twelfth lenses, to this range, the absolute values ​​of the focal lengths of the positive and negative lenses are made similar, which helps to smooth the transition of light, is beneficial to correcting chromatic aberration, and improves image quality.

[0092] In an exemplary embodiment, the zoom lens according to this application satisfies the following condition: Ft / Fw ≥ 10, where Ft is the focal length of the zoom lens at the telephoto end and Fw is the focal length of the zoom lens at the wide-angle end. By reasonably controlling the ratio of the focal length at the telephoto end to the focal length at the wide-angle end within this range, the system zoom ratio reaches 10x or more, which is beneficial for achieving a large zoom ratio and increasing the applicability of the zoom lens.

[0093] In an exemplary embodiment, the zoom lens according to this application satisfies: 4.42 ≤ |R25 / F14| ≤ 11.80, where R25 is the radius of curvature of the image-side surface of the fourteenth lens, and F14 is the effective focal length of the fourteenth lens. By controlling the absolute value of the ratio of the radius of curvature of the image-side surface of the fourteenth lens to the effective focal length of the lens within this range, the trajectory of the outgoing light can be effectively controlled, the outgoing light passing through the fourteenth lens can be reduced, and the light can be incident on the imaging surface at a suitable angle, which is beneficial to improving the imaging quality of the optical system.

[0094] In an exemplary embodiment, the zoom lens according to this application satisfies the condition: 1.17 ≤ (R6 + R7) / (R6 - R7) ≤ 1.40, where R6 is the radius of curvature of the object-side surface of the fourth lens, and R7 is the radius of curvature of the image-side surface of the fourth lens. By reasonably controlling the radius of curvature of the object-side and image-side surfaces of the fourth lens to satisfy the condition 1.17 ≤ (R6 + R7) / (R6 - R7) ≤ 1.40, it is beneficial to better correct distortion, making the absolute value of distortion DIS ≤ 4.2% throughout the entire range, reducing the degree of image deformation, and effectively restoring the authenticity of the photographed object.

[0095] In an exemplary embodiment, the zoom lens according to this application satisfies the following condition: 0.99 ≤ F4 / FG2 ≤ 1.10, where F4 is the effective focal length of the fourth lens and FG2 is the effective focal length of the second lens group. By reasonably controlling the ratio of the effective focal length of the fourth lens to that of the second lens group within this range, the fourth lens introduces positive distortion, which helps to better balance the distortion of the optical system, ensuring that the absolute value of the total distortion (DIS) is ≤ 4.2%, reducing the degree of image distortion, and effectively restoring the realism of the photographed object.

[0096] In an exemplary embodiment, the zoom lens according to this application satisfies: 1.40 ≤ |(R22+R23) / (R22-R23)| ≤ 2.46, where R22 is the radius of curvature of the object-side surface of the thirteenth lens, and R23 is the radius of curvature of the image-side surface of the thirteenth lens. By reasonably controlling the radius of curvature of the object-side and image-side surfaces of the thirteenth lens to satisfy the condition 1.40 ≤ |(R22+R23) / (R22-R23)| ≤ 2.46, the light path can be effectively controlled, and various aberrations such as astigmatism, coma, and spherical aberration generated by the optical system can be better corrected, greatly improving the imaging performance of the optical system.

[0097] In an exemplary embodiment, the zoom lens according to this application satisfies the following condition: -1.07 ≤ F13 / FG5 ≤ -0.65, where F13 is the effective focal length of the thirteenth lens and FG5 is the effective focal length of the fifth lens group. By reasonably controlling the ratio of the effective focal length of the thirteenth lens to that of the fifth lens group within this range, it is beneficial to better correct distortion, ensuring that the absolute value of the total distortion (DIS) is ≤4.2%, reducing the degree of image distortion, and effectively restoring the authenticity of the photographed object.

[0098] In an exemplary embodiment, the zoom lens of this application may, as needed, further include a filter and / or protective glass disposed between the fifth lens group and the imaging plane (between the fourteenth lens and the imaging plane). The filter can filter light with a specific wavelength, and the protective glass can prevent damage to the image-side elements (e.g., chips) of the zoom lens.

[0099] The zoom lens according to the embodiments of this application may include five lens groups arranged sequentially from the object side to the image side along the optical axis. By reasonably setting the first to fifth lens groups to have positive, negative, positive, positive, and positive optical powers in sequence, and setting the first, third, and fifth lens groups as fixed groups, the second lens group as a zoom group, and the fourth lens group as a focusing group, the second lens group zoom group can move along the optical axis from the object side to the image side, and the fourth lens group focusing group can make a non-linear movement along the optical axis corresponding to the second lens group. At the same time, by reasonably setting the number of lenses, optical powers, and parameters such as surface shape, radius of curvature, refractive index, and Abbe number included in each lens group, the zoom lens can achieve at least one of the following beneficial effects: wide-angle end with a large field of view (FOV_w≥76°), large zoom ratio (10x or more), low distortion (absolute value of DIS distortion ≤4.2%), adaptation to 1 / 2.5" size chips, high resolution, miniaturization, high imaging quality, and low cost.

[0100] However, those skilled in the art will understand that the structure and number of lens groups constituting the lens can be changed without departing from the technical solutions claimed in this application to obtain the various results and advantages described in this specification. For example, although the embodiment is described using five lens groups with a total of fourteen lenses as an example, the zoom lens is not limited to including these five lens groups / fourteen lenses. If desired, the zoom lens may also include other numbers of lens groups or lenses. Specific embodiments of zoom lenses applicable to the above embodiments are further described below with reference to the accompanying drawings.

[0101] Example 1

[0102] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 1 of this application. The following refers to... Figure 1 A zoom lens according to Embodiment 1 of this application is described.

[0103] like Figure 1 As shown, the zoom lens includes, in sequence along the optical axis from the object side to the image side, a first lens group G1, a second lens group G2, an aperture stop STO, a third lens group G3, a fourth lens group G4, and a fifth lens group G5, as well as an imaging surface IMG located at the image side.

[0104] In this embodiment, the first lens group G1 has positive optical power and is a fixed group, including a first lens L1, a second lens L2, and a third lens L3 arranged sequentially from the object side to the image side along the optical axis. The first lens L1 has negative optical power, with its object side S1 being convex and its image side S2 being concave. The second lens L2 has positive optical power, with its object side S2 being convex and its image side S3 being convex. The third lens L3 has positive optical power, with its object side S4 being convex and its image side S5 being concave. Furthermore, the first lens L1 and the second lens L2 are cemented together to form a cemented doublet lens.

[0105] In this embodiment, the second lens group G2 has negative optical power and is a zoom group. Moving it along the optical axis from the object side to the image side allows the zoom lens to achieve magnification from the wide-angle end to the telephoto end. It includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged sequentially along the optical axis from the object side to the image side. The fourth lens L4 has negative optical power, with its object side S6 being convex and its image side S7 being concave; the fifth lens L5 has negative optical power, with its object side S8 being convex and its image side S9 being concave; the sixth lens L6 has negative optical power, with its object side S10 being concave and its image side S11 being concave; and the seventh lens L7 has positive optical power, with its object side S11 being convex and its image side S12 being convex. Furthermore, the sixth lens L6 and the seventh lens L7 are cemented together to form a cemented doublet lens.

[0106] In this embodiment, the third lens group G3 has positive optical power and is a fixed group, including an eighth lens L8 and a ninth lens L9 arranged sequentially from the object side to the image side along the optical axis. The eighth lens L8 has positive optical power, and its object side S14 is convex and its image side S15 is convex. The ninth lens L9 has negative optical power, and its object side S16 is concave and its image side S17 is concave.

[0107] In this embodiment, the fourth lens group G4 has positive optical power and serves as a focusing group. It moves non-linearly along the optical axis corresponding to the second lens group G2, enabling focusing and image plane compensation. This allows for image plane correction, ensuring the stability of the zoom lens's image quality during zooming. The system includes a tenth lens L10, an eleventh lens L11, and a twelfth lens L12 arranged sequentially from the object side to the image side along the optical axis. The tenth lens L10 has positive optical power, with its object side S18 and image side S19 being convex. The eleventh lens L11 has positive optical power, with its object side S20 and image side S21 being convex. The twelfth lens L12 has negative optical power, with its object side S21 and image side S22 being concave. Furthermore, the eleventh lens L11 and the twelfth lens L12 are cemented together to form a cemented doublet lens.

[0108] In this embodiment, the fifth lens group G5 has positive optical power and is a fixed group, including a thirteenth lens L13 and a fourteenth lens L14 arranged sequentially from the object side to the image side along the optical axis. The thirteenth lens L13 has negative optical power, its object side S23 is concave, and its image side S24 is convex. The fourteenth lens L14 has positive optical power, its object side S25 is convex, and its image side S26 is convex.

[0109] In this embodiment, the aperture stop STO of the zoom lens is positioned between the seventh lens L7 and the eighth lens L8.

[0110] In this embodiment, the filter and / or protective glass located between the fifth lens group G5 and the imaging surface IMG has an object-side surface S27 and an image-side surface S28. Light from the object passes sequentially through each surface S1 to S28 and is finally imaged on the imaging surface, wherein an image sensor chip IMA may be disposed at the imaging surface.

[0111] Table 1 shows the radius of curvature R, thickness / distance, refractive index N, and Abbe number Vd of each lens in the zoom lens of Example 1.

[0112]

[0113]

[0114] Table 1

[0115] In Example 1, the object-side surface S8 and image-side surface S9 of the fifth lens L5, the object-side surface S14 and image-side surface S15 of the eighth lens L8, and the object-side surface S23 and image-side surface S24 of the thirteenth lens L13 are all aspherical surfaces. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0116]

[0117] Where x 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 aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the conic coefficient k and higher-order coefficients A4, A6, A8, A14, S15, S23, and S24 that can be used for the aspherical mirrors S8, S9, S14, S15, S23, and S24 in Example 1. 10 A 12 A 14 and A 16 .

[0118] Number / Coefficient k A4 A6 A8 A10 A12 A14 A16 S8 10.06 -4.53E-04 6.28E-06 -1.35E-07 1.69E-09 -1.11E-11 0.00E+00 0.00E+00 S9 -13.07 -7.86E-05 -2.21E-06 3.48E-08 -4.21E-10 1.27E-12 0.00E+00 0.00E+00 S14 0.96 -8.43E-05 6.05E-08 -2.22E-08 3.92E-10 -9.31E-13 0.00E+00 0.00E+00 S15 -0.84 7.32E-05 -2.27E-09 -7.39E-09 1.04E-10 2.55E-12 0.00E+00 0.00E+00 S23 -2.52 4.55E-03 -1.74E-04 3.29E-06 4.70E-09 -6.72E-10 0.00E+00 0.00E+00 S24 30.00 4.81E-03 -9.25E-05 -5.61E-07 6.66E-08 2.46E-10 0.00E+00 0.00E+00

[0119] Table 2

[0120] In Example 1, by changing the positions of the second lens group G2 and the fourth lens group G4 on the optical axis, the total effective focal length of the zoom lens can change with the distance from the subject, thereby achieving continuous zoom. The distance D1 corresponding to row S5 in Table 1 can be a variable, representing the air gap between the first and second lens groups on the optical axis when the zoom lens is at the wide-angle and telephoto ends; the distance D2 corresponding to row S12 in Table 1 can also be a variable, representing the air gap between the second lens group and the aperture stop on the optical axis when the zoom lens is at the wide-angle and telephoto ends; the distance D3 corresponding to row S17 in Table 1 can also be a variable, representing the air gap between the third and fourth lens groups on the optical axis when the zoom lens is at the wide-angle and telephoto ends; the distance D4 corresponding to row S22 in Table 1 can also be a variable, representing the air gap between the fourth and fifth lens groups on the optical axis when the zoom lens is at the wide-angle and telephoto ends. In this embodiment, the zoom lens achieves zoom by moving the second lens group G2 and the fourth lens group G4. The values ​​(in mm) of the above variables D1, D2, D3 and D4 when the lens is at the wide-angle end and the telephoto end are respectively shown in Table 3 below.

[0121] Face number distance Wide-angle end Observation Depth S5 D1 0.871 38.007 S12 D2 37.377 0.241 S17 D3 9.959 2.869 S22 D4 1.914 9.004

[0122] Table 3

[0123] Figure 2 The distortion curve of the zoom lens in Example 1 at the wide-angle end is shown; Figure 3 The distortion curve of the zoom lens in Embodiment 1 at the telephoto end is shown. According to... Figure 2 and Figure 3 It can be seen that the zoom lens given in Example 1 can achieve a low distortion effect.

[0124] Example 2

[0125] Figure 4 A schematic diagram of the zoom lens at the wide-angle end according to Embodiment 2 of this application is shown below. Figure 4 This application describes a zoom lens according to Embodiment 2. For the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted in this embodiment and the following embodiments.

[0126] like Figure 4 As shown, the zoom lens in this embodiment has a structural configuration that is basically the same as that of the zoom lens in Embodiment 1. That is, along the optical axis from the object side to the image side, it sequentially includes a first lens group G1, a second lens group G2, an aperture stop STO, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and an imaging plane IMG located at the image side. Furthermore, the optical power and operation mode of the first lens group G1 to the fifth lens group G5 are the same as those of the zoom lens described in Embodiment 1. The number of lenses, optical power, surface features, and cementing features of each lens group are also basically the same as those of the zoom lens described in Embodiment 1. However, only the following lenses have different surface features from the corresponding lenses described in Embodiment 1:

[0127] In this embodiment, the object-side surface S10 of the sixth lens L6 is concave and the image-side surface S11 is convex; the object-side surface S11 of the seventh lens L7 is concave and the image-side surface S12 is convex; and the object-side surface S25 of the fourteenth lens L14 is convex and the image-side surface S26 is concave.

[0128] Table 4 shows the radius of curvature R, thickness / distance, refractive index N, and Abbe number Vd of each lens in the zoom lens of Example 2.

[0129]

[0130]

[0131] Table 4

[0132] In Example 2, the object-side surface S8 and image-side surface S9 of the fifth lens L5, the object-side surface S14 and image-side surface S15 of the eighth lens L8, and the object-side surface S23 and image-side surface S24 of the thirteenth lens L13 are all aspherical surfaces. Table 5 shows the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 of each aspherical mirror surface S8, S9, S14, S15, S23, and S24 that can be used in Example 2. 10 A 12 A 14 and A 16 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0133] Number / Coefficient k A4 A6 A8 A10 A12 A14 A16 S8 -50 -7.31E-04 1.42E-05 -3.72E-07 6.43E-09 -5.62E-11 0.00E+00 0.00E+00 S9 -33.65 -3.33E-04 -1.96E-06 8.32E-08 -1.38E-09 4.59E-12 0.00E+00 0.00E+00 S14 1.38 -8.23E-05 5.47E-07 -3.41E-08 6.20E-10 -3.47E-12 0.00E+00 0.00E+00 S15 2.60 1.02E-04 1.14E-06 -3.53E-08 7.90E-10 -4.54E-12 0.00E+00 0.00E+00 S23 1.10 4.19E-03 -1.34E-04 3.24E-06 -3.85E-08 7.00E-17 0.00E+00 0.00E+00 S24 50 4.22E-03 -7.98E-05 1.11E-06 1.50E-08 -3.76E-17 0.00E+00 0.00E+00

[0134] Table 5

[0135] In Example 2, by changing the positions of the second lens group G2 and the fourth lens group G4 on the optical axis, the total effective focal length of the zoom lens can change with the distance from the subject, thereby achieving continuous zoom. The distances D1 corresponding to row S5, D2 corresponding to row S12, D3 corresponding to row S17, and D4 corresponding to row S22 in Table 4 have the same meaning as D1 to D4 described in Example 1. In this example, by moving the second lens group G2 and the fourth lens group G4, the zoom lens achieves magnification. The values ​​(in mm) of the variables D1, D2, D3, and D4 when the lens is at the wide-angle end and the telephoto end are shown in Table 6 below.

[0136] Face number distance Wide-angle end Observation Depth S5 D1 0.800 34.277 S12 D2 34.019 0.736 S17 D3 15.721 3.132 S22 D4 2.010 14.599

[0137] Table 6

[0138] Figure 5 The distortion curve of the zoom lens in Example 2 at the wide-angle end is shown; Figure 6 The distortion curve of the zoom lens in Embodiment 2 at the telephoto end is shown. According to... Figure 5 and Figure 6 It can be seen that the zoom lens given in Example 2 can achieve a low distortion effect.

[0139] Example 3

[0140] Figure 7 A schematic diagram of the zoom lens at the wide-angle end according to Embodiment 3 of this application is shown below. Figure 7 Description of a zoom lens according to Embodiment 3 of this application.

[0141] like Figure 7 As shown, the zoom lens in this embodiment has a structural configuration that is basically the same as that of the zoom lens in Embodiment 1. That is, along the optical axis from the object side to the image side, it sequentially includes a first lens group G1, a second lens group G2, an aperture stop STO, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and an imaging plane IMG located at the image side. Furthermore, the optical power and operation mode of the first lens group G1 to the fifth lens group G5 are the same as those of the zoom lens described in Embodiment 1. The number of lenses, optical power, surface features, and cementing features of each lens group are also basically the same as those of the zoom lens described in Embodiment 1. However, only the following lenses have different surface features from the corresponding lenses described in Embodiment 1:

[0142] In this embodiment, the object-side surface S10 of the sixth lens L6 is concave and the image-side surface S11 is convex; the object-side surface S11 of the seventh lens L7 is concave and the image-side surface S12 is convex; the object-side surface S16 of the ninth lens L9 is convex and the image-side surface S17 is concave; and the object-side surface S25 of the fourteenth lens L14 is convex and the image-side surface S26 is concave.

[0143] Table 7 shows the radius of curvature R, thickness / distance, refractive index N, and Abbe number Vd of each lens in the zoom lens of Example 3.

[0144]

[0145]

[0146] Table 7

[0147] In Example 3, the object-side surface S8 and image-side surface S9 of the fifth lens L5, the object-side surface S14 and image-side surface S15 of the eighth lens L8, and the object-side surface S23 and image-side surface S24 of the thirteenth lens L13 are all aspherical surfaces. Table 8 shows the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 of each aspherical mirror surface S8, S9, S14, S15, S23, and S24 that can be used in Example 3. 10 A 12 A 14 and A 16 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0148] Number / Coefficient k A4 A6 A8 A10 A12 A14 A16 S8 50.00 -7.25E-04 1.35E-05 -3.66E-07 6.49E-09 -5.74E-11 0.00E+00 0.00E+00 S9 -35.56 -3.23E-04 -2.60E-06 9.34E-08 -1.45E-09 4.67E-12 0.00E+00 0.00E+00 S14 0.99 -1.00E-04 4.13E-07 -3.43E-08 6.32E-10 -4.34E-12 0.00E+00 0.00E+00 S15 2.90 8.68E-05 8.79E-07 -3.69E-08 8.20E-10 -5.82E-12 0.00E+00 0.00E+00 S23 -1.05 4.24E-03 -1.51E-04 3.88E-06 -4.86E-08 6.99E-17 0.00E+00 0.00E+00 S24 50 4.41E-03 -9.11E-05 1.40E-06 1.65E-08 -3.79E-17 0.00E+00 0.00E+00

[0149] Table 8

[0150] In Example 3, by changing the positions of the second lens group G2 and the fourth lens group G4 on the optical axis, the total effective focal length of the zoom lens can change with the distance from the subject, thereby achieving continuous zoom. The distances D1 corresponding to row S5, D2 corresponding to row S12, D3 corresponding to row S17, and D4 corresponding to row S22 in Table 7 have the same meaning as D1 to D4 described in Example 1. In this example, by moving the second lens group G2 and the fourth lens group G4, the zoom lens achieves magnification. The values ​​(in mm) of the variables D1, D2, D3, and D4 when the lens is at the wide-angle end and the telephoto end are shown in Table 9 below.

[0151] Face number distance Wide-angle end Observation Depth S5 D1 0.800 34.826 S12 D2 34.545 0.736 S17 D3 16.169 3.041 S22 D4 2.071 15.199

[0152] Table 9

[0153] Figure 8The distortion curve of the zoom lens in Example 3 at the wide-angle end is shown; Figure 9 The distortion curve of the zoom lens in Example 3 at the telephoto end is shown. According to... Figure 8 and Figure 9 It can be seen that the zoom lens given in Example 3 can achieve a low distortion effect.

[0154] Example 4

[0155] Figure 10 A schematic diagram of the zoom lens at the wide-angle end according to Embodiment 4 of this application is shown below. Figure 10 The zoom lens according to Embodiment 4 of this application is described.

[0156] like Figure 10 As shown, the zoom lens in this embodiment has a structural configuration that is basically the same as that of the zoom lens in Embodiment 1. That is, along the optical axis from the object side to the image side, it sequentially includes a first lens group G1, a second lens group G2, an aperture stop STO, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and an imaging plane IMG located at the image side. Furthermore, the optical power and operation mode of the first lens group G1 to the fifth lens group G5 are the same as those of the zoom lens described in Embodiment 1. The number of lenses, optical power, surface features, and cementing features of each lens group are also basically the same as those of the zoom lens described in Embodiment 1. However, only the following lenses have different surface features from the corresponding lenses described in Embodiment 1:

[0157] In this embodiment, the object-side surface S10 of the sixth lens L6 is concave and the image-side surface S11 is convex; the object-side surface S11 of the seventh lens L7 is concave and the image-side surface S12 is convex; and the object-side surface S25 of the fourteenth lens L14 is convex and the image-side surface S26 is concave.

[0158] Table 10 shows the radius of curvature R, thickness / distance, refractive index N, and Abbe number Vd of each lens in the zoom lens of Example 4.

[0159]

[0160]

[0161] Table 10

[0162] In Example 4, the object-side surface S8 and image-side surface S9 of the fifth lens L5, the object-side surface S14 and image-side surface S15 of the eighth lens L8, and the object-side surface S23 and image-side surface S24 of the thirteenth lens L13 are all aspherical surfaces. Table 11 shows the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 of each aspherical mirror surface S8, S9, S14, S15, S23, and S24 that can be used in Example 4.10 A 12 A 14 and A 16 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0163] Number / Coefficient k A4 A6 A8 A10 A12 A14 A16 S8 -26.63 -7.48E-04 1.47E-05 -3.89E-07 6.75E-09 -5.86E-11 0.00E+00 0.00E+00 S9 -32.57 -3.38E-04 -1.81E-06 7.90E-08 -1.31E-09 4.19E-12 0.00E+00 0.00E+00 S14 1.18 -9.05E-05 4.76E-07 -3.41E-08 6.36E-10 -4.15E-12 0.00E+00 0.00E+00 S15 2.74 9.53E-05 9.70E-07 -3.55E-08 7.96E-10 -5.33E-12 0.00E+00 0.00E+00 S23 0.86 4.19E-03 -1.38E-04 3.43E-06 -4.10E-08 7.00E-17 0.00E+00 0.00E+00 S24 50 4.22E-03 -8.38E-05 1.21E-06 1.60E-08 -3.76E-17 0.00E+00 0.00E+00

[0164] Table 11

[0165] In Example 4, by changing the positions of the second lens group G2 and the fourth lens group G4 on the optical axis, the total effective focal length of the zoom lens can change with the distance from the subject, thereby achieving continuous zoom. The distances D1 corresponding to row S5, D2 corresponding to row S12, D3 corresponding to row S17, and D4 corresponding to row S22 in Table 10 have the same meaning as D1 to D4 described in Example 1. In this example, by moving the second lens group G2 and the fourth lens group G4, the zoom lens achieves magnification. The values ​​(in mm) of the variables D1, D2, D3, and D4 when the lens is at the wide-angle end and the telephoto end are shown in Table 12 below.

[0166]

[0167]

[0168] Table 12

[0169] Figure 11 The distortion curve of the zoom lens in Example 4 at the wide-angle end is shown; Figure 12 The distortion curve of the zoom lens in Example 4 at the telephoto end is shown. According to... Figure 11 and Figure 12 It can be seen that the zoom lens given in Example 4 can achieve a low distortion effect.

[0170] In Examples 1 to 4, the aperture number FNO_w of the zoom lens at the wide-angle end, the aperture number FNO_t of the zoom lens at the telephoto end, the field of view FOV_w of the zoom lens at the wide-angle end, the distortion DIS_w of the zoom lens at the wide-angle end, the distortion DIS_t of the zoom lens at the telephoto end, the effective focal length Fw of the zoom lens at the wide-angle end, and the effective focal length Ft of the zoom lens at the telephoto end are shown in Table 13.

[0171] Example / Parameters FNO_w FNO_t FOV_w DIS_w DIS_t Fw(mm) Ft(mm) 1 1.887 2.64 76.57° -4.08％ 3.16％ 4.75 51.3 2 1.888 2.6 78.238° -4.16％ 0.70％ 4.6 48.94 3 1.887 2.61 78.256° -4.15％ 0.66％ 4.6 48.69 4 1.887 2.6 78.238° -4.16％ 0.68％ 4.6 48.95

[0172] Table 13

[0173] Examples 1 to 4 satisfy the relationships shown in Table 14 below.

[0174]

[0175]

[0176] Table 14

[0177] This application also provides an electronic device that may include a zoom lens according to the above embodiments of this application and an imaging element for converting the optical image formed by the zoom lens into an electrical signal.

[0178] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A zoom lens, characterized in that, Along the optical axis from the object side to the image side, the lens group consists of a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group, in sequence. The first lens group is a fixed group with positive optical power, including a first lens with negative optical power, a second lens with positive optical power and a third lens with positive optical power arranged sequentially from the object side to the image side along the optical axis; The second lens group is a zoom group with negative optical power, including a fourth lens with negative optical power, a fifth lens with negative optical power, a sixth lens with negative optical power, and a seventh lens with positive optical power arranged sequentially from the object side to the image side along the optical axis. The third lens group is a fixed group with positive optical power, including an eighth lens with positive optical power and a ninth lens with negative optical power arranged sequentially from the object side to the image side along the optical axis. The fourth lens group is a focusing group with positive optical power, including a tenth lens with positive optical power, an eleventh lens with positive optical power, and a twelfth lens with negative optical power arranged sequentially from the object side to the image side along the optical axis. The fifth lens group is a fixed group with positive optical power, including a thirteenth lens with negative optical power and a fourteenth lens with positive optical power arranged sequentially from the object side to the image side along the optical axis. The zoom lens has fourteen lenses with optical power. The effective focal length FG5 of the fifth lens group and the focal length Fw of the zoom lens at the wide-angle end satisfy: 6.27≤FG5 / Fw≤7.

40.

2. The zoom lens according to claim 1, characterized in that, The object-side surface of the first lens is convex, and the image-side surface is concave. The object-side surface of the second lens is convex, and the image-side surface is also convex; and The object-side surface of the third lens is convex, and the image-side surface is concave.

3. The zoom lens according to claim 1, characterized in that, The first lens and the second lens are cemented together to form a first cemented lens.

4. The zoom lens according to claim 1, characterized in that, The sixth lens and the seventh lens are cemented together to form a second cemented lens.

5. The zoom lens according to claim 1, characterized in that, The object-side surface of the eleventh lens is convex, and the image-side surface is also convex; and The object side and image side of the twelfth lens are both concave.

6. The zoom lens according to claim 1, characterized in that, The eleventh lens and the twelfth lens are cemented together to form a third cemented lens.

7. The zoom lens according to claim 1, characterized in that, The object-side surface of the thirteenth lens is concave, and the image-side surface is convex; and The object-side surface of the fourteenth lens is concave.

8. The zoom lens according to claim 3, characterized in that, The radius of curvature R2 of the cemented surface of the first cemented lens and the effective focal length FG1 of the first lens group satisfy: 0.630≤R2 / FG1≤0.

661.

9. The zoom lens according to claim 3, characterized in that, The center thickness d of the first cemented lens on the optical axis 1胶合 The total optical length dG1 of the first lens group satisfies: 0.63 ≤ d 1胶合 / dG1≤0.

68.

10. The zoom lens according to any one of claims 1 to 7, characterized in that, The effective focal length FG1 of the first lens group and the focal length Fw of the zoom lens at the wide-angle end satisfy: 12.93≤FG1 / Fw≤13.

94.

11. The zoom lens according to any one of claims 1 to 7, characterized in that, The effective focal length FG2 of the second lens group and the focal length Fw of the zoom lens at the wide-angle end satisfy: -2.49≤FG2 / Fw≤-1.

90.

12. The zoom lens according to any one of claims 1 to 7, characterized in that, The effective focal length FG3 of the third lens group and the focal length Fw of the zoom lens at the wide-angle end satisfy: 7.23≤FG3 / Fw≤7.

74.

13. The zoom lens according to any one of claims 1 to 7, characterized in that, The effective focal length FG4 of the fourth lens group and the focal length Fw of the zoom lens at the wide-angle end satisfy: 6.02≤FG4 / Fw≤6.

77.

14. The zoom lens according to any one of claims 1 to 7, characterized in that, The distance d12t between the first lens group and the second lens group on the optical axis when the zoom lens is at the telephoto end, the distance d12w between the first lens group and the second lens group on the optical axis when the zoom lens is at the wide-angle end, and the total optical length TTL of the zoom lens satisfy the following condition: 0.3≤(d12t-d12w) / TTL≤0.

36.

15. The zoom lens according to any one of claims 1 to 7, characterized in that, The distance d45t between the fourth lens group and the fifth lens group on the optical axis when the zoom lens is at the telephoto end, the distance d45w between the fourth lens group and the fifth lens group on the optical axis when the zoom lens is at the wide-angle end, and the total optical length TTL of the zoom lens satisfy the following condition: 0.05≤(d45t-d45w) / TTL≤0.

14.

16. The zoom lens according to any one of claims 1 to 7, characterized in that, The distance d12t between the first lens group and the second lens group on the optical axis when the zoom lens is at the telephoto end, the distance d12w between the first lens group and the second lens group on the optical axis when the zoom lens is at the wide-angle end, the distance d45t between the fourth lens group and the fifth lens group on the optical axis when the zoom lens is at the telephoto end, and the distance d45w between the fourth lens group and the fifth lens group on the optical axis when the zoom lens is at the wide-angle end satisfy: 2.06≤(d12t-d12w) / (d45t-d45w)≤5.

77.

17. The zoom lens according to claim 1, characterized in that, The Abbe number Vd6 of the sixth lens and the Abbe number Vd7 of the seventh lens satisfy the following condition: 56.180≤Vd6-Vd7≤70.

870.

18. The zoom lens according to claim 1, characterized in that, The Abbe number Vd11 of the eleventh lens and the Abbe number Vd12 of the twelfth lens satisfy the following condition: 34.480 ≤ Vd11 - Vd12 ≤ 59.

620.

19. The zoom lens according to claim 1, characterized in that, The effective focal length F11 of the eleventh lens and the effective focal length F12 of the twelfth lens satisfy the following condition: 1.50≤|F11 / F12|≤1.

88.

20. The zoom lens according to any one of claims 1 to 7, characterized in that, The focal length Ft of the zoom lens at the telephoto end and the focal length Fw of the zoom lens at the wide-angle end satisfy: Ft / Fw≥10.

21. The zoom lens according to any one of claims 1 to 7, characterized in that, The radius of curvature R25 of the image side surface of the fourteenth lens and the effective focal length F14 of the fourteenth lens satisfy the following condition: 4.42≤|R25 / F14|≤11.

80.

22. The zoom lens according to claim 1, characterized in that, The radius of curvature R6 of the object side of the fourth lens and the radius of curvature R7 of the image side of the fourth lens satisfy: 1.17≤(R6+R7) / (R6-R7)≤1.

40.

23. The zoom lens according to claim 1, characterized in that, The effective focal length F4 of the fourth lens and the effective focal length FG2 of the second lens group satisfy the following condition: 0.99≤F4 / FG2≤1.

10.

24. The zoom lens according to any one of claims 1 to 7, characterized in that, The radius of curvature R22 of the object side of the thirteenth lens and the radius of curvature R23 of the image side of the thirteenth lens satisfy: 1.40≤|(R22+R23) / (R22-R23)|≤2.

46.

25. The zoom lens according to any one of claims 1 to 7, characterized in that, The effective focal length F13 of the thirteenth lens and the effective focal length FG5 of the fifth lens group satisfy the following condition: -1.07≤F13 / FG5≤-0.

65.

26. The zoom lens according to claim 1, characterized in that, The zoom lens satisfies any one of the following conditions: 0.644≤d1 胶合 / dG1≤0.666; 13.520≤FG1 / Fw≤13.868; -2.400≤FG2 / Fw≤-1.994; 7.308≤FG3 / Fw≤7.663; 6.132≤FG4 / Fw≤6.287; 6.398≤FG5 / Fw≤6.965; 0.314≤(d12t-d12w) / TTL≤0.346; 0.066≤(d45t-d45w) / TTL≤0.123; 2.592≤(d12t-d12w) / (d45t-d45w)≤5.238; 1.609≤|F11 / F12|≤1.831; 10.585≤Ft / Fw≤10.800; 5.585≤|R25 / F14|≤10.699; 1.205≤(R6+R7) / (R6-R7)≤1.360; 1.007≤F4 / FG2≤1.066; 1.558≤|(R22+R23) / (R22-R23)|≤2.121; -1.008≤F13 / FG5≤-0.718; Wherein, the first lens and the second lens are cemented together to form a first cemented lens, FG1 is the effective focal length of the first lens group, and d 1胶合 dG1 is the center thickness of the first cemented lens on the optical axis, FG2 is the effective focal length of the second lens group, FG3 is the effective focal length of the third lens group, FG4 is the effective focal length of the fourth lens group, d12t is the distance between the first and second lens groups on the optical axis when the zoom lens is at the telephoto end, d12w is the distance between the first and second lens groups on the optical axis when the zoom lens is at the wide-angle end, TTL is the total optical length of the zoom lens, d45t is the distance between the fourth and fifth lens groups on the optical axis when the zoom lens is at the telephoto end, and d45w is... The distance between the fourth lens group and the fifth lens group on the optical axis when the zoom lens is at the wide-angle end; F11 is the effective focal length of the eleventh lens; F12 is the effective focal length of the twelfth lens; Ft is the focal length of the zoom lens at the telephoto end; R25 is the radius of curvature of the image side of the fourteenth lens; F14 is the effective focal length of the fourteenth lens; R6 is the radius of curvature of the object side of the fourth lens; R7 is the radius of curvature of the image side of the fourth lens; F4 is the effective focal length of the fourth lens; R22 is the radius of curvature of the object side of the thirteenth lens; R23 is the radius of curvature of the image side of the thirteenth lens; and F13 is the effective focal length of the thirteenth lens.

Images