A zoom lens

Abstract

The application discloses a zoom lens which comprises a first lens group, a second lens group, a third lens group and a fourth 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, and comprises six lenses with refractive power, i.e. an eighth lens with positive refractive power, a ninth lens with positive refractive power, a tenth lens with positive refractive power, an eleventh lens with negative refractive power, a twelfth lens with positive refractive power and a thirteenth lens with negative refractive power which are arranged in sequence from the object side to the image side along the optical axis; and the fourth lens group is a focusing group with positive refractive power.

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. Zoom lenses, with their ability to adapt to different usage scenarios, are experiencing a continuous increase in market demand. With the development of modern society and the advancement of science and technology, zoom optical systems have been widely applied in all aspects of life, such as security monitoring and intelligent transportation. As the usage of zoom lenses increases year by year, the requirements for their optical performance and product stability are also becoming increasingly stringent.

[0003] However, current zoom lenses on the market still have many shortcomings: existing zoom lenses usually have a small imaging target size and low image resolution; existing zoom lenses generally have a small aperture and the aperture changes during zooming, resulting in an unclear image; in addition, existing zoom lenses generally use a large number of lenses and have a large lens size, making it difficult to achieve miniaturization of the entire camera design.

[0004] Therefore, given the current state of zoom lens development, zoom lenses that can meet design requirements such as large aperture, low distortion, and large lens surface are one of the current market demands. Summary of the Invention

[0005] This application provides a zoom lens that, along the optical axis from the object side to the image side, may sequentially include a first lens group, a second lens group, a third lens group, and a fourth lens group. 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 six lenses with optical power, namely, an eighth lens with positive optical power, a ninth lens with positive optical power, a tenth lens with positive optical power, an eleventh lens with negative optical power, a twelfth lens with positive optical power, and a thirteenth lens with negative optical power, arranged sequentially along the optical axis from the object side to the image side; and the fourth lens group is a focusing group with positive optical power.

[0006] In one embodiment, the first lens group may include 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 positive optical power; the second lens has negative 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 convex or flat; the object-side surface of the second lens is convex, and the image-side surface is concave; and the object-side surface of the third lens is convex, and the image-side surface is concave.

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

[0009] In one embodiment, the second lens group may include four lenses with optical power, namely 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 and the fifth lens has negative optical power.

[0010] In one embodiment, the image-side surface of the fourth lens is concave; the object-side surface of the fifth lens is concave, and the image-side surface is concave; and the image-side surface of the sixth lens is concave.

[0011] In one embodiment, the fifth lens is cemented with the sixth lens to form a cemented doublet lens; or the sixth lens is cemented with the seventh lens to form a cemented doublet lens.

[0012] In one embodiment, the object-side surface of the eighth lens is convex, and the image-side surface is convex; the object-side surface of the ninth lens is convex; the object-side surface of the tenth lens is concave, and the image-side surface is convex; the object-side surface of the eleventh lens is concave, and the image-side surface is concave; the object-side surface of the twelfth lens is convex, and the image-side surface is convex; and the object-side surface of the thirteenth lens is concave, and the image-side surface is concave.

[0013] In one embodiment, the tenth lens is cemented with the eleventh lens to form a cemented doublet; and the twelfth lens is cemented with the thirteenth lens to form a cemented doublet.

[0014] In one embodiment, the fourth lens group may include three lenses with optical power, namely a fourteenth lens, a fifteenth lens, and a sixteenth lens arranged sequentially from the object side to the image side along the optical axis, wherein the fourteenth lens has positive optical power; the fifteenth lens has positive optical power; and the sixteenth lens has negative optical power.

[0015] In one embodiment, the fourteenth lens has a convex object-side surface and a convex image-side surface; the fifteenth lens has a convex object-side surface and a convex image-side surface; and the sixteenth lens has a concave object-side surface.

[0016] In one embodiment, the fifteenth lens and the sixteenth lens are cemented together to form a cemented doublet lens.

[0017] 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: 4.7≤FG1 / Fw≤5.6.

[0018] 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: -1.7≤FG2 / Fw≤-1.2.

[0019] 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: 2.7≤FG3 / Fw≤4.4.

[0020] 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: 1.6≤FG4 / Fw≤2.2.

[0021] In one embodiment, the distance D2 that the second lens group moves along the optical axis during the switching process of the zoom lens from the wide-angle end to the telephoto end can satisfy the following condition with respect to the holographic height IH of the zoom lens: 2.1≤D2 / IH≤2.8.

[0022] In one embodiment, the distance D2 that the second lens group moves along the optical axis during the switching process of the zoom lens from the wide-angle end to the telephoto end can satisfy the following condition: 0.2≤D2 / TTL≤0.3.

[0023] In one embodiment, the distance D4 that the fourth lens group moves along the optical axis during the switching process of the zoom lens from the wide-angle end to the telephoto end can satisfy the following condition: 0≤D4 / TTL≤0.1.

[0024] In one embodiment, the distance D2 that the second lens group moves along the optical axis during the switching process of the zoom lens from the wide-angle end to the telephoto end can satisfy the following condition: 2.0≤D2 / Fw≤2.5.

[0025] In one embodiment, the third lens group includes at least one lens with an Abbe number Vd. (G3) It can satisfy: 65≤Vd (G3) ≤95.

[0026] In one embodiment, the third lens group includes at least one lens with a refractive index Nd (G3) It can satisfy: 1.4≤Nd (G3) ≤1.6.

[0027] In one embodiment, the center thickness TG4 of the fourth lens group on the optical axis and the effective focal length FG4 of the fourth lens group can satisfy: 0.3≤TG4 / FG4≤0.7.

[0028] In one embodiment, the focal length Ft of the zoom lens at the telephoto end and the effective focal length FG1 of the first lens group can satisfy: 0.7≤Ft / FG1≤0.9.

[0029] In one embodiment, the total optical length TTL of the zoom lens and the focal length Ft of the zoom lens at the telephoto end can satisfy: 1.9≤TTL / Ft≤2.1.

[0030] In one embodiment, the effective focal length f8 of the eighth lens closest to the object side in the third lens group and the effective focal length FG3 of the third lens group can satisfy: 0.5≤f8 / FG3≤1.5.

[0031] In one embodiment, the center thickness T16 of the sixteenth lens closest to the image side in the fourth lens group on the optical axis and the center thickness TG4 of the fourth lens group on the optical axis can satisfy: 0.1≤T16 / TG4≤0.5.

[0032] In one embodiment, the fourth lens in the second lens group closest to the object side can satisfy the following condition: the full aperture Dmax4 of the zoom lens when the zoom lens is at the wide-angle end, and the holographic height IH of the zoom lens: 1.7≤Dmax4 / IH≤2.3.

[0033] The zoom lens according to an embodiment of this application includes a first lens group, a second lens group, a third lens group, and a fourth 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 six lenses arranged sequentially along the optical axis from the object side to the image side, each with positive, positive, positive, negative, positive, and negative optical powers; and the fourth lens group is a focusing group with positive optical power. This arrangement of the zoom lens allows it to achieve at least one of the following beneficial effects: large aperture, low distortion, large sensor size, miniaturization, and high image quality. Attached Figure Description

[0034] 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:

[0035] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 1 of this application;

[0036] Figure 2 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 1 of this application;

[0037] Figure 3 This is a distortion curve diagram of the zoom lens at the wide-angle end according to Embodiment 1 of this application;

[0038] Figure 4 This is a distortion curve diagram of the zoom lens at the telephoto end according to Embodiment 1 of this application;

[0039] Figure 5 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 2 of this application;

[0040] Figure 6 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 2 of this application;

[0041] Figure 7 This is a distortion curve diagram of the zoom lens at the wide-angle end according to Embodiment 2 of this application;

[0042] Figure 8 This is a distortion curve diagram of the zoom lens at the telephoto end according to Embodiment 2 of this application;

[0043] Figure 9 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 3 of this application;

[0044] Figure 10 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 3 of this application;

[0045] Figure 11 This is a distortion curve diagram of the zoom lens at the wide-angle end according to Embodiment 3 of this application;

[0046] Figure 12 This is a distortion curve diagram of the zoom lens at the telephoto end according to Embodiment 3 of this application;

[0047] Figure 13 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 4 of this application;

[0048] Figure 14 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 4 of this application;

[0049] Figure 15 This is a distortion curve diagram of the zoom lens at the wide-angle end according to Embodiment 4 of this application; and

[0050] Figure 16 This is a distortion curve diagram of the zoom lens at the telephoto end according to Embodiment 4 of this application. Detailed Implementation

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] The features, principles and other aspects of this application are described in detail below.

[0059] In an exemplary embodiment, the zoom lens may include a first lens group, a second lens group, a third lens group, and a fourth lens group. The first to fourth lens groups may be arranged sequentially along the optical axis from the object side to the image side.

[0060] In an exemplary embodiment, the first lens group may have positive optical power and may be a fixed group with a fixed position relative to the image plane. Its main function is to correct the aberrations and distortions of the system, while reducing tolerance sensitivity and ensuring the uniformity of the image.

[0061] In an exemplary embodiment, the second lens group may have negative optical power, and the second lens group may be a zoom group that can move along the optical axis from the object side to the image side, thereby enabling the zoom lens to zoom from the wide-angle end to the telephoto end.

[0062] In an exemplary embodiment, the third lens group may have positive optical power. The third lens group may be a fixed group with a fixed position relative to the image plane, which can smooth the outgoing light and reduce the generation of aberrations. The third lens group may include six lenses with optical power, which are arranged sequentially along the optical axis from the object side to the image side: an eighth lens with positive optical power, a ninth lens with positive optical power, a tenth lens with positive optical power, an eleventh lens with negative optical power, a twelfth lens with positive optical power, and a thirteenth lens with negative optical power.

[0063] In an exemplary embodiment, the fourth lens group may have positive optical power and may be a focusing group for focusing (or compensation). It mainly undertakes the function of image plane compensation and can compensate the image plane during continuous zooming of the lens, thereby ensuring the imaging quality of the lens body during continuous zooming.

[0064] A zoom lens according to an exemplary embodiment of this application includes a first lens group, a second lens group, a third lens group, and a fourth 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 six lenses arranged sequentially along the optical axis from the object side to the image side, each with positive, positive, positive, negative, positive, and negative optical powers; and the fourth lens group is a focusing group with positive optical power. This arrangement of the zoom lens allows for at least one of the following beneficial effects: large aperture, low distortion, large sensor size, miniaturization, and high image quality.

[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. The first lens may have positive optical power; the second lens may have negative optical power; and the third lens may have positive optical power.

[0066] In an exemplary embodiment, the object-side surface of the first lens can be convex, and the image-side surface can be either convex or flat. The object-side surface of the second lens can be convex, and the image-side surface can be concave. The object-side surface of the third lens can be convex, and the image-side surface can be concave.

[0067] In an exemplary embodiment, the first lens group includes two positive lenses and one negative lens. The first lens is a positive convex-convex or convex-flat lens, and the second lens is a negative convex-concave lens. This configuration facilitates the collection of light rays with a large field of view into the optical system, enabling the zoom lens to have a large field of view at the wide-angle end, for example, FOV_w ≥ 55°. Furthermore, the object-side surface of the second and third lenses is convex, and the image-side surface is concave, which also helps to reduce distortion.

[0068] In an exemplary embodiment, the second lens and the third lens can be cemented together to form a cemented doublet lens.

[0069] In an exemplary embodiment, the second lens group may include four lenses with optical power, for example, 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. The fourth lens may have negative optical power; the fifth lens may have negative optical power.

[0070] In an exemplary embodiment, the image-side surface of the fourth lens may be concave. The object-side surface of the fifth lens may be concave, and the image-side surface may also be concave. The image-side surface of the sixth lens may also be concave.

[0071] In an exemplary embodiment, the fifth lens and the sixth lens can be cemented together to form a cemented doublet lens.

[0072] In an exemplary embodiment, the sixth lens and the seventh lens can be cemented together to form a cemented doublet lens.

[0073] In an exemplary embodiment, the second lens group includes a cemented doublet lens, which helps to balance the positional chromatic aberration of the second lens group and reduce the tolerance sensitivity of the second lens group.

[0074] In an exemplary embodiment, the third lens group may include an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens arranged sequentially from the object side to the image side along the optical axis, wherein the eighth to thirteenth lenses may have positive, positive, positive, negative, positive, and negative optical powers, respectively.

[0075] In an exemplary embodiment, the object-side surface of the eighth lens can be convex, and the image-side surface can also be convex. The object-side surface of the ninth lens can be convex. The object-side surface of the tenth lens can be concave, and the image-side surface can be convex. The object-side surface of the eleventh lens can be concave, and the image-side surface can also be concave. The object-side surface of the twelfth lens can be convex, and the image-side surface can also be convex. The object-side surface of the thirteenth lens can be concave, and the image-side surface can also be concave.

[0076] In an exemplary embodiment, the tenth lens and the eleventh lens can be cemented together to form a cemented doublet lens; the twelfth lens and the thirteenth lens can be cemented together to form a cemented doublet lens.

[0077] In an exemplary embodiment, the third lens group comprises two cemented lenses. The combination of positive and negative lenses facilitates mutual compensation of positive and negative spherical aberrations, thereby improving the system's resolution.

[0078] In an exemplary embodiment, the fourth lens group may include three lenses with optical power, for example, a fourteenth lens, a fifteenth lens, and a sixteenth lens arranged sequentially from the object side to the image side along the optical axis. The fourteenth lens may have positive optical power; the fifteenth lens may have positive optical power; and the sixteenth lens may have negative optical power.

[0079] In an exemplary embodiment, the object-side surface of the fourteenth lens can be convex, and the image-side surface can be convex. The object-side surface of the fifteenth lens can be convex, and the image-side surface can be convex; the object-side surface of the sixteenth lens can be concave.

[0080] In an exemplary embodiment, the fifteenth lens and the sixteenth lens can be cemented together to form a cemented doublet lens.

[0081] In an exemplary embodiment, the fourth lens group may include a positive lens and a cemented doublet lens. Using a positive lens helps to balance the astigmatism and distortion introduced by the front lens. Using a cemented doublet helps to balance the chromatic aberration introduced by the front lens, and also helps to balance various aberrations of the optical system.

[0082] 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. 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.

[0083] 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).

[0084] In an exemplary embodiment, the zoom lens of this application may further include, as needed, a filter and / or protective glass disposed between the fourth lens group 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.

[0085] In an exemplary embodiment, the zoom lens according to this application satisfies: 4.7 ≤ FG1 / Fw ≤ 5.6, 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 to converge large-angle incident light rays into the optical system, effectively expanding the field of view of the optical system.

[0086] In an exemplary embodiment, the zoom lens according to this application satisfies: -1.7 ≤ FG2 / Fw ≤ -1.2, 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, the required zoom ratio during zooming can be guaranteed while achieving imaging performance.

[0087] In an exemplary embodiment, the zoom lens according to this application satisfies: 2.7 ≤ FG3 / Fw ≤ 4.4, 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 smooth light transition, effectively reducing aberrations, and improving optical imaging quality.

[0088] In an exemplary embodiment, the zoom lens according to this application satisfies: 1.6 ≤ FG4 / Fw ≤ 2.2, 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, image plane stability during zooming can be ensured, and changes in spherical aberration and distortion throughout the zoom process can be reduced, thereby achieving high imaging performance.

[0089] In an exemplary embodiment, the zoom lens according to this application satisfies: 2.1 ≤ D2 / IH ≤ 2.8, where D2 is the distance the second lens group moves along the optical axis during the zoom lens's transition from wide-angle to telephoto, and IH is the full image height of the zoom lens. By controlling the ratio of the distance the second lens group moves along the optical axis during the zoom lens's transition from wide-angle to telephoto to the full image height of the zoom lens within this range, the length of the optical lens can be effectively limited under the same imaging plane and image height, thereby facilitating the miniaturization of the optical lens.

[0090] In an exemplary embodiment, the zoom lens according to this application satisfies the following condition: 0.2 ≤ D2 / TTL ≤ 0.3, where D2 is the distance the second lens group moves along the optical axis during the zoom lens's transition from wide-angle to telephoto, and TTL is the total optical length of the zoom lens, i.e., the distance along the optical axis from the object side of the first lens closest to the object side in the first lens group to the imaging plane of the zoom lens. By controlling the ratio of the distance the second lens group moves along the optical axis during the zoom lens's transition from wide-angle to telephoto to the total optical length of the zoom lens to fall within this range, the zoom lens can achieve a faster zoom speed.

[0091] In an exemplary embodiment, the zoom lens according to this application satisfies: 0 ≤ D4 / TTL ≤ 0.1, where D4 is the distance the fourth lens group moves along the optical axis during the zoom lens's transition from wide-angle to telephoto, and TTL is the total optical length of the zoom lens. By controlling the ratio of the distance the fourth lens group moves along the optical axis to the total optical length of the zoom lens during the transition from wide-angle to telephoto to fall within this range, the zoom lens can achieve a faster focusing speed.

[0092] In an exemplary embodiment, the zoom lens according to this application satisfies: 2.0 ≤ D2 / Fw ≤ 2.5, where D2 is the distance the second lens group moves along the optical axis during the zoom lens's transition from wide-angle to telephoto, and Fw is the focal length of the zoom lens at the wide-angle end. By controlling the ratio of the distance the second lens group moves along the optical axis during the zoom lens's transition from wide-angle to telephoto to the focal length of the zoom lens at the wide-angle end to fall within this range, aberrations between the first and second lens groups can be reduced, while also controlling the lens's size and reducing design costs.

[0093] In an exemplary embodiment, the zoom lens according to this application satisfies: 65 ≤ Vd (G3) ≤95, where Vd (G3) It is the Abbe number of the lenses included in the third lens group, and the third lens group must contain at least one lens whose Abbe number satisfies the condition 65 ≤ Vd. (G3) Lenses with an Abbe number ≤ 95. The Abbe number of the third lens group, which includes at least one lens, satisfies the condition 65 ≤ Vd. (G3) A value ≤95 can effectively correct the chromatic aberration of the third lens group, thereby improving the imaging quality of the optical system.

[0094] In an exemplary embodiment, the zoom lens according to this application satisfies: 1.4 ≤ Nd (G3) ≤1.6, where Nd (G3) It is the refractive index of the lenses included in the third lens group, and the third lens group contains at least one lens whose refractive index satisfies the condition 1.4 ≤ Nd. (G3) Lenses with a refractive index ≤ 1.6. This is achieved by controlling the refractive index of at least one lens in the third lens group to satisfy the condition 1.4 ≤ Nd. (G3) A value ≤1.6 can effectively correct the spherical aberration of the third lens group, thereby improving the imaging quality of the optical system.

[0095] In an exemplary embodiment, the zoom lens according to this application satisfies the following condition: 0.3 ≤ TG4 / FG4 ≤ 0.7, where TG4 is the center thickness of the fourth lens group on the optical axis, i.e., the total optical length of the fourth lens group, which is also the distance on the optical axis from the object-side surface of the fourteenth lens closest to the object side to the image-side surface of the sixteenth lens closest to the image side, and FG4 is the effective focal length of the fourth lens group. By controlling the ratio of the total optical length of the fourth lens group to the effective focal length of the fourth lens group within this range, the volume of the fourth lens group can be made smaller, which is beneficial for achieving lens miniaturization.

[0096] In an exemplary embodiment, the zoom lens according to this application satisfies: 0.7 ≤ Ft / FG1 ≤ 0.9, where Ft is the focal length of the zoom lens at the telephoto end, and FG1 is the effective focal length of the first lens group. By controlling the ratio of the focal length of the zoom lens at the telephoto end to the effective focal length of the first lens group within this range, various aberrations at the telephoto end can be balanced, and resolution can be improved.

[0097] In an exemplary embodiment, the zoom lens according to this application satisfies: 1.9 ≤ TTL / Ft ≤ 2.1, where TTL is the total optical length of the zoom lens and Ft is the focal length of the zoom lens at the telephoto end. By controlling the ratio of the total optical length of the zoom lens to the focal length of the zoom lens at the telephoto end within this range, the total optical length of the system can be kept small, which is beneficial for miniaturization.

[0098] In an exemplary embodiment, the zoom lens according to this application satisfies the following condition: 0.5 ≤ f8 / FG3 ≤ 1.5, where f8 is the effective focal length of the eighth lens closest to the object side in the third lens group, and FG3 is the effective focal length of the third lens group. By controlling the ratio of the effective focal length of the eighth lens closest to the object side in the third lens group to the effective focal length of the third lens group within this range, the eighth lens can have a light-gathering effect, thereby ensuring the amount of light transmitted.

[0099] In an exemplary embodiment, the zoom lens according to this application satisfies: 0.1 ≤ T16 / TG4 ≤ 0.5, where T16 is the center thickness of the sixteenth lens closest to the image side in the fourth lens group on the optical axis, and TG4 is the center thickness of the fourth lens group on the optical axis, i.e., the distance on the optical axis from the object side of the fourteenth lens closest to the object side in the fourth lens group to the image side of the sixteenth lens closest to the image side in the fourth lens group. By controlling the ratio of the center thickness of the sixteenth lens closest to the image side in the fourth lens group to the center thickness of the fourth lens group on the optical axis within this range, it is beneficial for the smooth transition of nearby light and for the correction of field curvature.

[0100] In an exemplary embodiment, the zoom lens according to this application satisfies: 1.7 ≤ Dmax4 / IH ≤ 2.3, where Dmax4 is the total aperture of the fourth lens closest to the object side in the second lens group when the zoom lens is at the wide-angle end, and IH is the total image height of the zoom lens. By controlling the ratio of the total aperture of the fourth lens closest to the object side in the second lens group to the total image height of the zoom lens within this range, it is beneficial to effectively converge the light entering the optical system and to reduce the lens aperture of the optical system.

[0101] In an exemplary embodiment, the zoom lens according to this application has a constant aperture. During zooming, the aperture remains constant, the resolution does not decrease, the image is clear, and the background blur is natural.

[0102] In an exemplary embodiment, the zoom lens according to this application can achieve dual-light-path imaging. By using appropriate material combinations and a beam-splitting prism, infrared light and visible light can be imaged independently, resulting in a color image at night.

[0103] In an exemplary embodiment, the zoom lens according to this application adopts a four-group architecture of fixed, zoom, fixed, and focus lenses with an aperture stop. The four lens groups have positive, negative, positive, and positive optical powers, respectively. This architecture of the zoom lens can effectively correct field curvature and distortion, so that the absolute value of distortion at the wide-angle end can be as low as 7%, while meeting the usage requirements of large target surfaces (the maximum imaging target surface can reach 12.8mm).

[0104] The zoom lens according to the embodiments of this application may include four lens groups arranged sequentially from the object side to the image side along the optical axis. By reasonably setting the first to fourth lens groups to have positive, negative, positive, and positive optical powers in sequence, and setting the first and third lens groups as fixed groups, the second lens group as zoom groups, and the fourth lens group as focusing groups, and by reasonably setting the number of lenses, optical powers, surface shape, refractive index, Abbe number, and other parameters included in each lens group, the zoom lens can achieve at least one of the following beneficial effects: large aperture, low distortion, large target surface, miniaturization, wide angle, and high imaging quality.

[0105] However, those skilled in the art will understand that, without departing from the technical solutions claimed in this application, the structure and number of lens groups constituting the lens can be changed to obtain the various results and advantages described in this specification. For example, although four lens groups are described as an example in the embodiments, the zoom lens is not limited to including these four lens groups, and the number of lenses included in each lens group is not limited to the number described in the above embodiments. If necessary, 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.

[0106] Example 1

[0107] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 1 of this application. Figure 2 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 1 of this application. The following refers to... Figure 1 and Figure 2 A zoom lens according to Embodiment 1 of this application is described.

[0108] like Figure 1 and Figure 2As shown, the zoom lens, along the optical axis from the object side to the image side, includes, in sequence, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an aperture stop STO, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, a fifteenth lens L15, a sixteenth lens L16, a beam splitter P1, and an image plane (IMA) located at the image side.

[0109] In this embodiment, the first lens L1, the second lens L2, and the third lens L3 constitute a first lens group. The first lens L1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens L2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens L3 has positive optical power, with its object-side surface S4 being convex and its image-side surface S5 being concave. Furthermore, the second lens L2 and the third lens L3 are cemented together to form a cemented doublet lens. This first lens group has positive optical power, is a fixed group, and its position relative to the image plane is fixed. This allows it to correct aberrations and distortions in the system, while reducing tolerance sensitivity and ensuring image uniformity.

[0110] In this embodiment, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 constitute a second lens group. The fourth lens L4 has negative optical power, with its object-side surface S6 being concave and its image-side surface S7 being concave. The fifth lens L5 has negative optical power, with its object-side surface S8 being concave and its image-side surface S9 being concave. The sixth lens L6 has negative optical power, with its object-side surface S10 being concave and its image-side surface S11 being concave. The seventh lens L7 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. Furthermore, the sixth lens L6 and the seventh lens L7 are cemented together to form a cemented doublet lens. This second lens group has negative optical power and is a zoom group. The second lens group moves along the optical axis from the object side to the image side, enabling the zoom lens to zoom from the wide-angle end to the telephoto end.

[0111] In this embodiment, the six lenses—the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13—constitute the third lens group. The eighth lens L8 has positive optical power, with its object-side surface S14 being convex and its image-side surface S15 being convex. The ninth lens L9 has positive optical power, with its object-side surface S16 being convex and its image-side surface S17 being concave. The tenth lens L10 has positive optical power, with its object-side surface S18 being concave and its image-side surface S15 being concave. Lens 19 is convex; the eleventh lens L11 has negative optical power, with its object-side surface S19 being concave and its image-side surface S20 being concave; the twelfth lens L12 has positive optical power, with its object-side surface S21 being convex and its image-side surface S22 being convex; the thirteenth lens L13 has negative optical power, with its object-side surface S22 being concave and its image-side surface S23 being concave; furthermore, the tenth lens L10 and the eleventh lens L11 are cemented together to form a cemented doublet; the twelfth lens L12 and the thirteenth lens L13 are cemented together to form a cemented doublet. The third lens group has positive optical power and is a fixed group with a fixed position relative to the image plane, which can make the outgoing light rays smooth and reduce the generation of aberrations.

[0112] In this embodiment, the fourteenth lens L14, the fifteenth lens L15, and the sixteenth lens L16 constitute the fourth lens group. The fourteenth lens L14 has positive optical power, with a convex object-side surface S24 and a convex image-side surface S25. The fifteenth lens L15 has positive optical power, with a convex object-side surface S26 and a convex image-side surface S27. The sixteenth lens L16 has negative optical power, with a concave object-side surface S27 and a convex image-side surface S28. Furthermore, the fifteenth lens L15 and the sixteenth lens L16 are cemented together to form a cemented doublet lens. This fourth lens group, with its positive optical power, is a focusing group used for focusing (or compensation). During continuous zooming of the lens, it compensates for the image plane, ensuring image quality during continuous zooming of the lens body.

[0113] In this embodiment, the aperture stop STO of the zoom lens is disposed between the second lens group and the third lens group, and more specifically, between the seventh lens L7 and the eighth lens L8.

[0114] Table 1 shows the radius of curvature R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens in the zoom lens of Example 1.

[0115]

[0116]

[0117] Table 1

[0118] In this embodiment, by changing the positions of the second lens group and the fourth lens group on the optical axis, the total effective focal length of the zoom lens can change with the distance to the subject, thereby achieving continuous zoom of the zoom lens. The distance T1 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 T2 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 STO on the optical axis when the zoom lens is at the wide-angle and telephoto ends; the distance T3 corresponding to row S23 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; and the distance T4 corresponding to row S28 in Table 1 can also be a variable, representing the air gap between the fourth lens group and the beam splitter P1 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 and the fourth lens group. The values ​​(in mm) of the above variables T1, T2, T3 and T4 when the lens is at the wide-angle end and the telephoto end are respectively shown in Table 2 below.

[0119]

[0120]

[0121] Table 2

[0122] Figure 3 The distortion curve of the zoom lens in Example 1 at the wide-angle end is shown; Figure 4 The distortion curve of the zoom lens in Example 1 at the telephoto end is shown. According to... Figure 3 and Figure 4 It can be seen that the zoom lens given in Example 1 can achieve a low distortion effect.

[0123] Example 2

[0124] Figure 5 This diagram shows a structural schematic of the zoom lens in the wide-angle position according to Embodiment 2 of this application. Figure 6 A schematic diagram of the zoom lens at the telephoto end according to Embodiment 2 of this application is shown below. Figure 5 and Figure 6 Description of a zoom lens according to Embodiment 2 of this application.

[0125] like Figure 5 and Figure 6As 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. Specifically, along the optical axis from the object side to the image side, it sequentially includes a first lens L1 to a sixteenth lens L16, a beam splitter P1, and an image plane located at the image side. The sixteen lenses can also be divided into four lens groups: the first to third lenses constitute the first lens group, the fourth to seventh lenses constitute the second lens group, the eighth to thirteenth lenses constitute the third lens group, and the fourteenth to sixteenth lenses constitute the fourth lens group. Furthermore, the optical power and operation mode of the four lens groups are the same as those of the zoom lens described in Embodiment 1. The number of lenses, optical power, surface features, and bonding features included in each lens group are also basically the same as those of the zoom lens described in Embodiment 1. Only the seventh lens L7 included in the second lens group has different surface features than the seventh lens L7 in Embodiment 1. Therefore, for the sake of brevity, the description of parts similar to those in Embodiment 1 is omitted in this embodiment, and only the differences between the two are explained as follows:

[0126] In this embodiment, the object-side surface S11 of the seventh lens L7 is convex, and the image-side surface S12 is concave.

[0127] Table 3 shows the radius of curvature R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens in the zoom lens of Example 2.

[0128]

[0129]

[0130] Table 3

[0131] In this embodiment, by changing the positions of the second and fourth lens groups 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 T1 (row S5), T2 (row S12), T3 (row S23), and T4 (row S28) in Table 3 have the same meaning as T1 to T4 described in Embodiment 1. In this embodiment, by moving the second and fourth lens groups, the zoom lens achieves magnification. The values ​​(in mm) of the variables T1, T2, T3, and T4 when the lens is at the wide-angle and telephoto ends are shown in Table 4 below.

[0132] Face number distance Wide-angle end telephoto end S5 T1 1.21 35.13 S12 T2 35.44 1.52 S23 T3 4.50 4.76 S28 T4 2.45 2.19

[0133] Table 4

[0134] Figure 7 The distortion curve of the zoom lens in Example 2 at the wide-angle end is shown; Figure 8The distortion curve of the zoom lens in Example 2 at the telephoto end is shown. According to... Figure 7 and Figure 8 It can be seen that the zoom lens given in Example 2 can achieve a low distortion effect.

[0135] Example 3

[0136] Figure 9 This diagram shows a structural schematic of the zoom lens in the wide-angle position according to Embodiment 3 of this application. Figure 10 A schematic diagram of the zoom lens at the telephoto end according to Embodiment 3 of this application is shown below. Figure 9 and Figure 10 Description of a zoom lens according to Embodiment 3 of this application.

[0137] like Figure 9 and Figure 10 As shown, the zoom lens, along the optical axis from the object side to the image side, includes, in sequence, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an aperture stop STO, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, a fifteenth lens L15, a sixteenth lens L16, a beam splitter P1, and an image plane (IMA) located at the image side.

[0138] In this embodiment, the first lens L1, the second lens L2, and the third lens L3 constitute a first lens group. The first lens L1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens L2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens L3 has positive optical power, with its object-side surface S4 being convex and its image-side surface S5 being concave. Furthermore, the second lens L2 and the third lens L3 are cemented together to form a cemented doublet lens. This first lens group has positive optical power, is a fixed group, and its position relative to the image plane is fixed. This allows it to correct aberrations and distortions in the system, while reducing tolerance sensitivity and ensuring image uniformity.

[0139] In this embodiment, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 constitute a second lens group. The fourth lens L4 has negative optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. The fifth lens L5 has negative optical power, with its object-side surface S8 being concave and its image-side surface S9 being concave. The sixth lens L6 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The seventh lens L7 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. Furthermore, the fifth lens L5 and the sixth lens L6 are cemented together to form a cemented doublet lens. This second lens group has negative optical power and is a zoom group. The second lens group moves along the optical axis from the object side to the image side, enabling the zoom lens to zoom from the wide-angle end to the telephoto end.

[0140] In this embodiment, the six lenses—the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13—constitute the third lens group. The eighth lens L8 has positive optical power, with its object-side surface S14 being convex and its image-side surface S15 being convex. The ninth lens L9 has positive optical power, with its object-side surface S16 being convex and its image-side surface S17 being convex. The tenth lens L10 has positive optical power, with its object-side surface S18 being concave and its image-side surface S15 being concave. Lens 19 is convex; the eleventh lens L11 has negative optical power, with its object-side surface S19 being concave and its image-side surface S20 being concave; the twelfth lens L12 has positive optical power, with its object-side surface S21 being convex and its image-side surface S22 being convex; the thirteenth lens L13 has negative optical power, with its object-side surface S22 being concave and its image-side surface S23 being concave; furthermore, the tenth lens L10 and the eleventh lens L11 are cemented together to form a cemented doublet; the twelfth lens L12 and the thirteenth lens L13 are cemented together to form a cemented doublet. The third lens group has positive optical power and is a fixed group with a fixed position relative to the image plane, which can make the outgoing light rays smooth and reduce the generation of aberrations.

[0141] In this embodiment, the fourteenth lens L14, the fifteenth lens L15, and the sixteenth lens L16 constitute the fourth lens group. The fourteenth lens L14 has positive optical power, with a convex object-side surface S24 and a convex image-side surface S25. The fifteenth lens L15 has positive optical power, with a convex object-side surface S26 and a convex image-side surface S27. The sixteenth lens L16 has negative optical power, with a concave object-side surface S27 and a concave image-side surface S28. Furthermore, the fifteenth lens L15 and the sixteenth lens L16 are cemented together to form a cemented doublet lens. This fourth lens group, with positive optical power, is a focusing group used for focusing (or compensation). During continuous zooming of the lens, it compensates for the image plane, ensuring image quality during continuous zooming of the lens body.

[0142] In this embodiment, the aperture stop STO of the zoom lens is disposed between the second lens group and the third lens group, and more specifically, between the seventh lens L7 and the eighth lens L8.

[0143] Table 5 shows the radius of curvature R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens in the zoom lens of Example 3.

[0144]

[0145] Table 5

[0146] In this embodiment, by changing the positions of the second and fourth lens groups 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 T1 (row S5), T2 (row S12), T3 (row S23), and T4 (row S28) in Table 5 have the same meaning as T1 to T4 described in Embodiment 1. In this embodiment, by moving the second and fourth lens groups, the zoom lens achieves magnification. The values ​​(in mm) of the variables T1, T2, T3, and T4 when the lens is at the wide-angle and telephoto ends are shown in Table 6 below.

[0147] Face number distance Wide-angle end telephoto end S5 T1 0.50 31.69 S12 T2 33.27 2.08 S23 T3 3.83 4.72 S28 T4 3.22 2.33

[0148] Table 6

[0149] Figure 11 The distortion curve of the zoom lens in Example 3 at the wide-angle end is shown; Figure 12 The distortion curve of the zoom lens in Example 3 at the telephoto end is shown. According to... Figure 11 and Figure 12 It can be seen that the zoom lens given in Example 3 can achieve a low distortion effect.

[0150] Example 4

[0151] Figure 13 This diagram shows a structural schematic of the zoom lens in the wide-angle position according to Embodiment 4 of this application. Figure 14 A schematic diagram of the zoom lens at the telephoto end according to Embodiment 4 of this application is shown below. Figure 13 and Figure 14 The zoom lens according to Embodiment 4 of this application is described.

[0152] like Figure 13 and Figure 14As shown, the zoom lens in this embodiment has a structural configuration that is basically the same as that of the zoom lens in Embodiment 3. That is, along the optical axis from the object side to the image side, it includes a first lens L1 to a sixteenth lens L16, a beam splitter P1, and an image plane located at the image side. The sixteen lenses can also be divided into four lens groups: the first to third lenses constitute the first lens group, the fourth to seventh lenses constitute the second lens group, the eighth to thirteenth lenses constitute the third lens group, and the fourteenth to sixteenth lenses constitute the fourth lens group. Furthermore, the optical power and operation mode of the four lens groups are the same as those of the zoom lens described in Embodiment 3, and 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 3. Only the first lens L1 in the first lens group, the ninth lens L9 in the third lens group, and the sixteenth lens L16 in the fourth lens group have different surface features compared to the first lens L1, the ninth lens L9, and the sixteenth lens L16 in Embodiment 3. Therefore, for the sake of brevity, the descriptions similar to those in Embodiment 3 are omitted in this embodiment, and only the differences between the two are explained as follows:

[0153] In this embodiment, the object-side surface S1 of the first lens L1 is convex, and the image-side surface S2 is planar. The object-side surface S16 of the ninth lens L9 is convex, and the image-side surface S17 is concave. The object-side surface S27 of the sixteenth lens L16 is concave, and the image-side surface S28 is convex.

[0154] Table 7 shows the radius of curvature R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens in the zoom lens of Example 4.

[0155]

[0156] Table 7

[0157] In this embodiment, by changing the positions of the second and fourth lens groups 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 T1 (row S5), T2 (row S12), T3 (row S23), and T4 (row S28) in Table 7 have the same meaning as T1 to T4 described in Embodiment 1. In this embodiment, the zoom lens achieves magnification by moving the second and fourth lens groups. The values ​​(in mm) of the variables T1, T2, T3, and T4 when the lens is at the wide-angle and telephoto ends are shown in Table 8 below.

[0158] Face number distance Wide-angle end telephoto end S5 T1 0.57 29.54 S12 T2 32.00 3.03 S23 T3 5.36 5.73 S28 T4 1.87 1.50

[0159] Table 8

[0160] Figure 15 The distortion curve of the zoom lens in Example 4 at the wide-angle end is shown; Figure 16 The distortion curve of the zoom lens in Example 4 at the telephoto end is shown. According to... Figure 15 and Figure 16 It can be seen that the zoom lens given in Example 4 can achieve a low distortion effect.

[0161] In Examples 1 to 4, the effective focal length f (Fw-Ft) of the zoom lens at the wide-angle end and the telephoto end, the aperture number FNO (Fw-Ft) of the zoom lens at the wide-angle end and the telephoto end, and the distortion (Fw-Ft) of the zoom lens at the wide-angle end and the telephoto end are shown in Table 9.

[0162] Example / Parameters f(Fw-Ft) FNO(wt) Distortion (wt) 1 14-60 (mm) 1.62 -12％、2.3％ 2 14-60 (mm) 1.64 -12％、2.0％ 3 14-60 (mm) 1.63 -7％、2.0％ 4 14-60 (mm) 1.64 -7％、2.0％

[0163] Table 9

[0164] Examples 1 to 4 respectively satisfy the relationships shown in Table 10 below.

[0165]

[0166]

[0167] Table 10

[0168] 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.

[0169] 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, and a fourth lens group, in sequence. The first lens group is a fixed group with positive optical power, which includes a first lens with positive optical power, a second lens with negative 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, which includes a fourth lens with negative optical power, a fifth lens with negative optical power, a sixth lens with opposite positive and negative optical power attributes, and a seventh lens 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, comprising, along the optical axis from the object side to the image side, an eighth lens with positive optical power, a ninth lens with positive optical power, a tenth lens with positive optical power, an eleventh lens with negative optical power, a twelfth lens with positive optical power, and a thirteenth lens with negative optical power; and, The fourth lens group is a focusing group with positive optical power, which includes a fourteenth lens with positive optical power, a fifteenth lens with positive optical power, and a sixteenth lens with negative optical power arranged sequentially from the object side to the image side along the optical axis. The zoom lens contains sixteen lenses with optical power; and 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: 2.7≤FG3 / Fw≤4.

4.

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 either convex or flat. The object-side surface of the second lens is convex, and the image-side surface is concave; 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 second lens and the third lens are cemented together to form a cemented doublet lens.

4. The zoom lens according to claim 1, characterized in that, The image-side surface of the fourth lens is concave. The object-side surface of the fifth lens is concave, and the image-side surface is also concave; and The image-side surface of the sixth lens is concave.

5. The zoom lens according to claim 1, characterized in that, The fifth lens and the sixth lens are cemented together to form a cemented doublet lens; or The sixth lens and the seventh lens are cemented together to form a cemented doublet lens.

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

7. The zoom lens according to claim 1, characterized in that, The tenth lens and the eleventh lens are cemented together to form a cemented doublet lens; and The twelfth lens and the thirteenth lens are cemented together to form a cemented doublet lens.

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

9. The zoom lens according to claim 1, characterized in that, The fifteenth lens and the sixteenth lens are cemented together to form a cemented doublet lens.

10. The zoom lens according to any one of claims 1 to 9, 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: 4.7≤FG1 / Fw≤5.

6.

11. The zoom lens according to any one of claims 1 to 9, 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: -1.7≤FG2 / Fw≤-1.

2.

12. The zoom lens according to any one of claims 1 to 9, 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: 1.6≤FG4 / Fw≤2.

2.

13. The zoom lens according to any one of claims 1 to 9, characterized in that, The distance D2 that the second lens group moves along the optical axis during the switching process of the zoom lens from the wide-angle end to the telephoto end satisfies the following condition with respect to the holographic height IH of the zoom lens: 2.1≤D2 / IH≤2.

8.

14. The zoom lens according to any one of claims 1 to 9, characterized in that, The distance D2 that the second lens group moves along the optical axis during the switching process of the zoom lens from the wide-angle end to the telephoto end satisfies the following condition with respect to the total optical length TTL of the zoom lens: 0.2≤D2 / TTL≤0.

3.

15. The zoom lens according to any one of claims 1 to 9, characterized in that, The distance D4 that the fourth lens group moves along the optical axis during the switching process of the zoom lens from the wide-angle end to the telephoto end satisfies the following condition with respect to the total optical length TTL of the zoom lens: 0 ≤ D4 / TTL ≤ 0.

1.

16. The zoom lens according to any one of claims 1 to 9, characterized in that, The distance D2 that the second lens group moves along the optical axis during the switching process of the zoom lens from the wide-angle end to the telephoto end satisfies the following condition with respect to the focal length Fw of the zoom lens at the wide-angle end: 2.0≤D2 / Fw≤2.

5.

17. The zoom lens according to any one of claims 1 to 9, characterized in that, The third lens group includes at least one lens with an Abbe number Vd. (G3) Satisfies: 65≤Vd (G3) ≤95.

18. The zoom lens according to any one of claims 1 to 9, characterized in that, The third lens group includes at least one lens with a refractive index Nd. (G3) Satisfies: 1.4≤Nd (G3) ≤1.

6.

19. The zoom lens according to any one of claims 1 to 9, characterized in that, The center thickness TG4 of the fourth lens group on the optical axis and the effective focal length FG4 of the fourth lens group satisfy the following condition: 0.3≤TG4 / FG4≤0.

7.

20. The zoom lens according to any one of claims 1 to 9, characterized in that, The focal length Ft of the zoom lens at the telephoto end satisfies the following condition with respect to the effective focal length FG1 of the first lens group: 0.7≤Ft / FG1≤0.

9.

21. The zoom lens according to any one of claims 1 to 9, characterized in that, The total optical length TTL of the zoom lens and the focal length Ft of the zoom lens at the telephoto end satisfy: 1.9≤TTL / Ft≤2.

1.

22. The zoom lens according to any one of claims 1 to 9, characterized in that, The effective focal length f8 of the eighth lens closest to the object side in the third lens group satisfies the following condition: 0.5 ≤ f8 / FG3 ≤ 1.

5.

23. The zoom lens according to any one of claims 1 to 9, characterized in that, The center thickness T16 of the sixteenth lens closest to the image side in the fourth lens group and the center thickness TG4 of the fourth lens group on the optical axis satisfy the following condition: 0.1≤T16 / TG4≤0.

5.

24. The zoom lens according to any one of claims 1 to 9, characterized in that, The fourth lens in the second lens group, which is closest to the object side, satisfies the following condition when the zoom lens is at the wide-angle end: its full aperture Dmax4 and the full image height IH of the zoom lens are: 1.7≤Dmax4 / IH≤2.

3.

25. The zoom lens according to claim 1, characterized in that, The zoom lens satisfies at least one of the following: 4.880≤FG1 / Fw≤5.435;-1.558≤FG2 / Fw≤-1.316;2.784≤FG3 / Fw≤4.289;1.669≤FG4 / Fw≤2.017;2.268≤D2 / IH≤2.681;0.241≤D2 / TTL≤0.285;0.002≤D4 / TTL≤0.007;2.069≤D2 / Fw≤2.447;68.600≤Vd(G3)≤81.600;1.500≤Nd(G3)≤1.590;0.316≤TG4 / FG4≤0.547; 0.789≤Ft / FG1≤0.877; 1.998≤TTL / Ft≤2.002; 0.629≤f8 / FG3≤1.289; 0.126≤T16 / TG4≤0.370; 1.891≤Dmax4 / IH≤2.056; where FG1 is the effective focal length of the first lens group, FG2 is the effective focal length of the second lens group, FG4 is the effective focal length of the fourth lens group, D2 is the distance the second lens group moves along the optical axis during the switching of the zoom lens from wide-angle to telephoto, IH is the full image height of the zoom lens, TTL is the total optical length of the zoom lens, D4 is the distance the fourth lens group moves along the optical axis during the switching of the zoom lens from wide-angle to telephoto, and Vd (G3) Nd is the Abbe number of the third lens group, which includes at least one lens. (G3) The refractive index of the third lens group, which includes at least one lens, is given by TG4, which is the center thickness of the fourth lens group on the optical axis. Ft is the focal length of the zoom lens at the telephoto end. FG1 is the effective focal length of the first lens group. f8 is the effective focal length of the eighth lens in the third lens group closest to the object side. T16 is the center thickness of the sixteenth lens in the fourth lens group closest to the image side on the optical axis. Dmax4 is the full aperture of the fourth lens in the second lens group closest to the object side when the zoom lens is at the wide-angle end.

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