Zoom lens

Abstract

The application discloses a zoom lens which comprises, in order from the object side to the image side along the optical axis, a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with positive refractive power and a fifth lens group with refractive power; the first lens group, the third lens group and the fifth lens group are fixed groups, the second lens group is a zoom group, and the fourth lens group is a compensation group; wherein, in order from the object side to the image side along the optical axis, the first lens group comprises a first lens, a second lens, a third lens and a fourth lens; the second lens group comprises a fifth lens, a sixth lens and a seventh lens; the third lens group comprises an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens; the fourth lens group comprises a thirteenth lens and a fourteenth lens; and the fifth lens group comprises a fifteenth lens and a sixteenth lens.

Description

Technical Field

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

[0002] With the development of modern society and the advancement of science and technology, zoom lenses, because their focal length can be continuously changed within a certain range, are widely used in all aspects of life to adapt to the needs of different scenarios. At the same time, people's performance requirements for zoom lenses are also getting higher and higher.

[0003] However, existing zoom lenses still have the following problems: 1) When the object distance changes, the image cannot be consistently clear throughout the zoom range, and fast focusing cannot be achieved; 2) The image quality is poor and the distortion is large, resulting in the distortion of the people or scenes captured, and the scene cannot be realistically reproduced; 3) The lens is large in size and the structure is not compact enough, which is not conducive to miniaturization, etc. Summary of the Invention

[0004] This application provides a zoom lens, which comprises, along the optical axis from the object side to the image side, the following elements in sequence: a first lens group with positive optical power, a second lens group with negative optical power, a third lens group with positive optical power, a fourth lens with positive optical power, and a fifth lens group with optical power; the first lens group, the third lens group, and the fifth lens group are fixed groups, the second lens group is a zoom group, and the fourth lens group is a compensation group; wherein, the first lens group comprises, along the optical axis from the object side to the image side, the following elements in sequence: a first lens, a second lens, a third lens, and a fourth lens; the second lens group comprises, along the optical axis from the object side to the image side, the following elements in sequence: The fifth, sixth, and seventh lenses; the third lens group, along the optical axis from the object side to the image side, includes the eighth, ninth, tenth, eleventh, and twelfth lenses in sequence; the fourth lens group, along the optical axis from the object side to the image side, includes the thirteenth and fourteenth lenses in sequence; the fifth lens group, along the optical axis from the object side to the image side, includes the fifteenth and sixteenth lenses in sequence; the second lens group moves along the optical axis between the object side and the image side to achieve continuous zoom between the wide-angle and telephoto ends; the fourth lens group moves along the optical axis between the object side and the image side to compensate for changes in the image plane position during zooming.

[0005] According to an exemplary embodiment of this application, the first lens has negative optical power; the second lens has positive optical power; the third lens has positive optical power; and the fourth lens has positive optical power.

[0006] According to an exemplary embodiment of this application, the fifth lens has negative optical power; the sixth lens has negative optical power; and the seventh lens has positive optical power.

[0007] According to an exemplary embodiment of this application, the eighth lens has positive optical power; the ninth lens has positive optical power; the tenth lens has negative optical power; the eleventh lens has negative optical power; and the twelfth lens has positive optical power.

[0008] According to an exemplary embodiment of this application, the fifteenth lens has negative optical power; the sixteenth lens has positive optical power.

[0009] According to an exemplary embodiment of this application, the fourth lens group further includes a first auxiliary lens, which is located on the object side of the thirteenth lens.

[0010] According to an exemplary embodiment of this application, the first auxiliary lens has a negative optical power.

[0011] According to an exemplary embodiment of this application, the fifth lens group further includes a second auxiliary lens, which is located between the fifteenth lens and the sixteenth lens.

[0012] According to an exemplary embodiment of this application, the second auxiliary lens has positive optical power.

[0013] According to an exemplary embodiment of this application, the zoom lens satisfies: 2.1≤FG1 / Fw≤3.1, where FG1 is the effective focal length of the first lens group and Fw is the total effective focal length of the zoom lens when it is at the wide-angle end.

[0014] According to an exemplary embodiment of this application, the zoom lens satisfies: -1≤FG2 / Fw≤-0.5, where FG2 is the effective focal length of the second lens group and Fw is the total effective focal length of the zoom lens when it is at the wide-angle end.

[0015] According to an exemplary embodiment of this application, the zoom lens satisfies: 0.9≤FG3 / Fw≤1.7, where FG3 is the effective focal length of the third lens group and Fw is the total effective focal length of the zoom lens when it is at the wide-angle end.

[0016] According to an exemplary embodiment of this application, the zoom lens satisfies: 1≤FG4 / Fw≤3, where FG4 is the effective focal length of the fourth lens group and Fw is the total effective focal length of the zoom lens when it is at the wide-angle end.

[0017] According to an exemplary embodiment of this application, the zoom lens satisfies: 3≤|FG5 / Fw|≤13, where FG5 is the effective focal length of the fifth lens group and Fw is the total effective focal length of the zoom lens when it is at the wide-angle end.

[0018] According to an exemplary embodiment of this application, the zoom lens satisfies: 2≤Ft / Fw≤3.5, where Ft is the total effective focal length of the zoom lens when it is at the telephoto end, and Fw is the total effective focal length of the zoom lens when it is at the wide-angle end.

[0019] According to an exemplary embodiment of this application, the zoom lens satisfies: 0.4≤Ft / TTL≤0.8, where Ft is the total effective focal length of the zoom lens when it is at the telephoto end, and TTL is the on-axis distance from the object side of the first lens to the imaging plane of the zoom lens.

[0020] According to an exemplary embodiment of this application, the zoom lens satisfies: 0.15≤Fw / TTL≤0.4, where Fw is the total effective focal length of the zoom lens when it is at the wide-angle end, and TTL is the on-axis distance from the object side of the first lens to the imaging plane of the zoom lens.

[0021] According to an exemplary embodiment of this application, the zoom lens satisfies: 5.75≤TTL / d2≤8, where TTL is the on-axis distance from the object side of the first lens to the imaging plane of the zoom lens, and d2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end.

[0022] According to an exemplary embodiment of this application, the zoom lens satisfies: 0.3 ≤ 100 d4 / TTL≤3.5, where TTL is the on-axis distance from the object side of the first lens to the imaging plane of the zoom lens, and d4 is the on-axis distance between the position of the fourth lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the fourth lens group on the optical axis when the zoom lens is at the telephoto end.

[0023] According to an exemplary embodiment of this application, the zoom lens satisfies: 3.5≤ΦG1 / H≤5.6, where ΦG1 is the maximum full aperture of the lens in the first lens group, and H is the full image height of the zoom lens.

[0024] According to an exemplary embodiment of this application, the zoom lens satisfies: -3.9≤f7 / FG2≤-1.9, where f7 is the effective focal length of the seventh lens and FG2 is the effective focal length of the second lens group.

[0025] According to an exemplary embodiment of this application, the zoom lens satisfies: 0 < |f16 / FG5| ≤ 3.3, where f16 is the effective focal length of the sixteenth lens and FG5 is the effective focal length of the fifth lens group.

[0026] According to an exemplary embodiment of this application, the zoom lens satisfies: 0 < 1 - 2Ft tan(FOV_t / 2) / H≤0.045, where Ft is the total effective focal length of the zoom lens at the telephoto end, and FOV_t is the full field of view of the zoom lens at the telephoto end.

[0027] According to an exemplary embodiment of this application, the zoom lens satisfies: 4.3≤TTL / H≤5, where TTL is the on-axis distance from the object side of the first lens to the imaging plane of the zoom lens, and H is the full image height of the zoom lens.

[0028] According to an exemplary embodiment of this application, the zoom lens satisfies at least one of the following: 2.2≤FG1 / Fw≤2.95; -1≤FG2 / Fw≤-0.55; 0.95≤FG3 / Fw≤1.58; 1.25≤FG4 / Fw≤2.7; 3.3≤|FG5 / Fw|≤12.6; 2.0≤Ft / Fw≤3.2; 0.4≤Ft / TTL≤0.7; 0.15≤Fw / TTL≤0.25; 6≤TTL / d2≤7.8; 0.3≤100 d4 / TTL≤3.2; 3.75≤ΦG1 / H≤5.35; -3.7≤f7 / FG2≤-2.2; 0<|f16 / FG5|≤0.55; 0<1-2Ft tan(FOV_t / 2) / H≤0.04; 4.4≤TTL / H≤4.7; where FG1 is the effective focal length of the first lens group, 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, FG5 is the effective focal length of the fifth lens group, Fw is the total effective focal length of the zoom lens at the wide-angle end, Ft is the total effective focal length of the zoom lens at the telephoto end, TTL is the on-axis distance from the object side of the first lens to the imaging plane of the zoom lens, and ΦG1 is the first The maximum full aperture of the lenses in the lens group, H is the full image height of the zoom lens, d2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end, d4 ​​is the on-axis distance between the position of the fourth lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the fourth lens group on the optical axis when the zoom lens is at the telephoto end, f7 is the effective focal length of the seventh lens, f16 is the effective focal length of the sixteenth lens, and FOV_t is the full field of view when the zoom lens is at the telephoto end.

[0029] The zoom lens of this application adopts a five-group architecture of fixed + zoom + fixed + compensation + fixed. By reasonably setting the optical power, number of lenses and operation mode of the first to fifth lens groups, the zoom lens provided by this application has at least one of the following beneficial effects: continuous zoom, constant aperture, clear focusing at both near and far object distances, clear imaging, large field of view, wide field of view, small distortion value throughout the zoom range, and small size. Attached Figure Description

[0030] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0031] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 1 of this application;

[0032] Figure 2 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 1 of this application;

[0033] Figure 3 This is a distortion diagram of the zoom lens at the wide-angle end according to Embodiment 1 of this application;

[0034] Figure 4 This is a distortion image of the zoom lens at the telephoto end according to Embodiment 1 of this application;

[0035] Figure 5 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 2 of this application;

[0036] Figure 6 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 2 of this application;

[0037] Figure 7 This is a distortion diagram of the zoom lens at the wide-angle end according to Embodiment 2 of this application;

[0038] Figure 8 This is a distortion image of the zoom lens at the telephoto end according to Embodiment 2 of this application;

[0039] Figure 9 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 3 of this application;

[0040] Figure 10 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 3 of this application;

[0041] Figure 11 This is a distortion diagram of the zoom lens at the wide-angle end according to Embodiment 3 of this application;

[0042] Figure 12 This is a distortion image of the zoom lens at the telephoto end according to Embodiment 3 of this application;

[0043] Figure 13 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 4 of this application;

[0044] Figure 14 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 4 of this application;

[0045] Figure 15 This is a distortion diagram of the zoom lens at the wide-angle end according to Embodiment 4 of this application;

[0046] Figure 16 This is a distortion diagram of the zoom lens at the telephoto end according to Embodiment 4 of this application. Detailed Implementation

[0047] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this 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.

[0048] 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.

[0049] 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.

[0050] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0051] It should also be understood that the terms "comprising," "having," "including," etc., 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 a statement such as "at least one of..." appears after a list of listed features, it modifies the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to indicate "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0052] 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 the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense, unless expressly so specified herein.

[0053] 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.

[0054] According to an exemplary embodiment of this application, a zoom lens may include five lens groups with optical power sequentially along the optical axis from the object side to the image side: a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group. The first, third, and fifth lens groups are fixed groups, and their positions relative to the imaging plane of the zoom lens are fixed. The second lens group is a zoom group, and the fourth lens group is a compensation group. The second and fourth lens groups are movable along the optical axis between the object side and the image side.

[0055] In an exemplary embodiment, the first lens group of the zoom lens has positive optical power, which is beneficial for correcting aberrations and distortions in the system, while reducing tolerance sensitivity and ensuring image uniformity.

[0056] In an exemplary embodiment, the first lens group may include a cemented doublet lens and two positive lenses. Exemplarily, the first lens group may sequentially include a first lens, a second lens, a third lens, and a fourth lens along the optical axis from the object side to the image side. The first lens has negative optical power, the second lens has positive optical power, the third lens has positive optical power, and the fourth lens has positive optical power; wherein the first lens and the second lens can form a cemented doublet lens. In this application, the first lens group of the zoom lens is equipped with a cemented doublet lens, which helps to balance the positional chromatic aberration of the first lens group and improve the lens's resolving power. The third and fourth lenses, with positive optical power, can share the burden of large aberrations under a large field of view, quickly converge light while also helping to correct spherical aberration and chromatic aberration, further improving the lens's resolving power.

[0057] In an exemplary 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. The object-side surface of the third lens is convex, and the image-side surface is concave. The object-side surface of the fourth lens is convex, and the image-side surface is concave.

[0058] In an exemplary embodiment, the second lens group of the zoom lens has a negative optical power and can move along the optical axis between the object side and the image side. That is, the second lens group can move from the image side to the object side or from the object side to the image side along the optical axis, so that the zoom lens can achieve continuous zoom between the wide-angle end and the telephoto end. Specifically, by changing the position of the second lens group on the optical axis, the zoom lens can switch from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, so that the zoom lens can perform continuous zoom.

[0059] In an exemplary embodiment, the second lens group may include two negative lenses and one positive lens. Exemplarily, the second lens group may sequentially include a fifth lens, a sixth lens, and a seventh lens along the optical axis from the object side to the image side; the fifth lens has negative optical power; the sixth lens has negative optical power; and the seventh lens has positive optical power. The second lens group of the zoom lens in this application is provided with two negative lenses, which helps to reduce the height difference of light rays, correct field curvature, and improve the lens's resolving power; simultaneously, the provision of a positive lens helps to smooth out the diverging light rays, ensuring that the aperture remains constant during zooming, further improving the lens's resolving power.

[0060] In an exemplary embodiment, the object-side surface of the fifth lens is convex, and the image-side surface is concave. The object-side surface of the sixth lens is concave, and the image-side surface is concave. The object-side surface of the seventh lens is convex, and the image-side surface is concave.

[0061] In an exemplary embodiment, the third lens group of the zoom lens has positive optical power, which is beneficial for correcting aberrations and distortions in the system.

[0062] In an exemplary embodiment, the third lens group may include two cemented doublet lenses and one positive lens. Exemplarily, the third lens group may sequentially include, along the optical axis from the object side to the image side, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, and a twelfth lens. The eighth lens has positive optical power, the ninth lens has positive optical power, the tenth lens has negative optical power, the eleventh lens has negative optical power, and the twelfth lens has positive optical power. The ninth and tenth lenses form a cemented doublet, and the eleventh and twelfth lenses also form a cemented doublet. In this application, the third lens group of the zoom lens, through the cooperation of the eighth and ninth lenses with positive optical power, can effectively control the direction of light and reduce the height of light rays. The cemented doublet composed of the ninth lens with positive optical power and the tenth lens with negative optical power is beneficial for mutual compensation of positive and negative spherical aberration, improving the lens's resolving power. The cemented doublet composed of the eleventh lens with negative optical power and the twelfth lens with positive optical power is beneficial for controlling the direction of light rays, causing the light rays to rise slowly, which helps to achieve a large target surface.

[0063] In an exemplary embodiment, 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, and the image-side surface is also convex. The object-side surface of the tenth lens is concave, and the image-side surface is also concave. The object-side surface of the eleventh lens is convex, and the image-side surface is concave; or the object-side surface of the eleventh lens is concave, and the image-side surface is either convex or concave. The object-side surface of the twelfth lens is either convex or concave, and the image-side surface is convex.

[0064] In an exemplary embodiment, the fourth lens group of the zoom lens is of positive optical power and its position along the optical axis is adjustable. That is, the fourth lens group moves between the object side and the image side along the optical axis and moves in accordance with the movement of the second lens group to compensate for the change in the position of the imaging plane during zooming, so that the zoom lens has a better imaging position and stable imaging quality during continuous zooming.

[0065] In an exemplary embodiment, the fourth lens group may consist of a cemented doublet lens. Exemplarily, the fourth lens group may sequentially include a thirteenth lens and a fourteenth lens along the optical axis from the object side to the image side. The thirteenth lens has either positive or negative optical power, and the fourteenth lens has either positive or negative optical power; the thirteenth and fourteenth lenses together form a cemented doublet lens. In this application, the fourth lens group of the zoom lens, by incorporating a cemented doublet lens, helps to balance the off-axis chromatic aberration and aberrations of the zoom lens, improves the lens's resolving power, and can also effectively control the light path, making the light transition smoother, reducing the lens's tolerance sensitivity, and improving production yield.

[0066] In an exemplary embodiment, the fourth lens group may consist of a cemented doublet lens and a negative lens. Exemplarily, the fourth lens group may sequentially include, along the optical axis from the object side to the image side, a first auxiliary lens, a thirteenth lens, and a fourteenth lens. The first auxiliary lens has negative optical power, the thirteenth lens has either positive or negative optical power, and the fourteenth lens has either positive or negative optical power; wherein the thirteenth and fourteenth lenses constitute a cemented doublet lens. In this application, the fourth lens group of the zoom lens, by incorporating a cemented doublet lens, helps to balance the off-axis chromatic aberration and aberrations of the zoom lens, improves the lens's resolving power, and can also effectively control the light path, making the light transition smoother, reducing the lens's tolerance sensitivity, and improving production yield. Simultaneously, the first auxiliary lens, located on the object side of the thirteenth lens, can effectively compress the light beam height, reducing the lens's tolerance sensitivity.

[0067] In an exemplary embodiment, the object-side surface of the first auxiliary lens is convex, and the image-side surface is concave. The object-side surface of the thirteenth lens is convex, and the image-side surface is either convex or concave. The object-side surface of the fourteenth lens is concave, and the image-side surface is either convex or concave; or, the object-side surface of the fourteenth lens is convex, and the image-side surface is convex.

[0068] In an exemplary embodiment, the fifth lens group of the zoom lens is of positive or negative optical power, which helps to reduce CRA, make the light diffuse smoothly, and at the same time helps to raise the light and achieve a large target surface.

[0069] In an exemplary embodiment, the fifth lens group may consist of a negative lens and a positive lens. For example, the fifth lens group may sequentially include, along the optical axis from the object side to the image side, a fifteenth lens and a sixteenth lens, wherein the fifteenth lens has negative optical power and the sixteenth lens has positive optical power.

[0070] In an exemplary embodiment, the fifth lens group may consist of a cemented doublet lens and a positive lens. Exemplarily, the fifth lens group may sequentially include, along the optical axis from the object side to the image side, a fifteenth lens, a second auxiliary lens, and a sixteenth lens, wherein the fifteenth lens has negative optical power, the second auxiliary lens has positive optical power, and the sixteenth lens has positive optical power; wherein the fifteenth lens and the second auxiliary lens constitute a cemented doublet lens. In this application, the fifth lens group of the zoom lens, by incorporating a cemented doublet lens, can effectively correct residual chromatic aberration and field curvature, while simultaneously enhancing light intensity, increasing image height, and achieving a large target area.

[0071] In an exemplary embodiment, the object-side surface of the fifteenth lens is concave, and the image-side surface is convex, concave, or flat. The object-side surface of the second auxiliary lens is convex or flat, and the image-side surface is convex. The object-side surface of the sixteenth lens is convex or concave, and the image-side surface is convex.

[0072] In this application, the sixteenth lens is a positive lens with a convex image side, which is beneficial for smooth light transition while raising the light and reducing CRA. This is beneficial for the light to better match the chip size and achieve a large target surface. At the same time, it can further correct field curvature and improve the resolution of the lens.

[0073] In an exemplary embodiment, the zoom lens of this application further includes an aperture stop, which is disposed between the second lens group and the third lens group. Exemplarily, the aperture stop may be disposed between the seventh lens and the eighth lens. It should be noted that in alternative embodiments, the aperture stop may be disposed in other positions as needed, and no specific limitation is made thereto.

[0074] In an exemplary embodiment, the zoom lens satisfies: 2.1 ≤ FG1 / Fw ≤ 3.1, where FG1 is the effective focal length of the first lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end. By reasonably controlling the ratio of the effective focal length of the first lens group to the total effective focal length of the zoom lens at the wide-angle end, 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 of the zoom lens at the wide-angle end is one of 54.683°, 52.77°, 55.69°, and 56.94°. Exemplarily, the zoom lens can also satisfy: 2.2 ≤ FG1 / Fw ≤ 2.95, which is even more beneficial for converging large-angle incident light rays into the optical system, effectively expanding the field of view of the optical system.

[0075] In an exemplary embodiment, the zoom lens satisfies: -1 ≤ FG2 / Fw ≤ -0.5, where FG2 is the effective focal length of the second lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end. By reasonably controlling the ratio of the effective focal length of the second lens group to the total effective focal length of the zoom lens at the wide-angle end, imaging performance can be improved while ensuring the required zoom ratio during zooming. For example, the zoom lens can also satisfy: -1 ≤ FG2 / Fw ≤ -0.55, which is even more conducive to improving imaging performance while ensuring the required zoom ratio during zooming.

[0076] In an exemplary embodiment, the zoom lens satisfies: 0.9 ≤ FG3 / Fw ≤ 1.7, where FG3 is the effective focal length of the third lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end. By rationally allocating the effective focal length of the third lens group, 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. For example, the zoom lens can also satisfy: 0.95 ≤ FG3 / Fw ≤ 1.58, which further facilitates the third lens group in collecting the outgoing light from the second lens group, resulting in a smoother light transition, further reducing aberrations, and improving optical imaging quality.

[0077] In an exemplary embodiment, the zoom lens satisfies: 1 ≤ FG4 / Fw ≤ 3, where FG4 is the effective focal length of the fourth lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end. By reasonably controlling the effective focal length of the fourth lens group, while ensuring focusing clarity at different object distances and focal lengths, the changes in spherical aberration and distortion throughout the zoom process can be reduced, thereby achieving higher imaging performance. For example, the zoom lens can also satisfy: 1.25 ≤ FG4 / Fw ≤ 2.7. While ensuring focusing clarity at different object distances and focal lengths, this further helps to reduce changes in spherical aberration and distortion throughout the zoom process, further contributing to higher imaging performance.

[0078] In an exemplary embodiment, the zoom lens satisfies: 3 ≤ |FG5 / Fw| ≤ 13, where FG5 is the effective focal length of the fifth lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end. By reasonably controlling the effective focal length of the fifth lens group, it is beneficial to ensure a large target area effect throughout the zoom process, thereby achieving higher imaging performance. For example, the zoom lens can also satisfy: 3.3 ≤ |FG5 / Fw| ≤ 12.6, which further facilitates achieving a large target area effect throughout the zoom process and further enhances imaging performance.

[0079] In an exemplary embodiment, the zoom lens satisfies: 2 ≤ Ft / Fw ≤ 3.5, where Ft is the total effective focal length of the zoom lens at the telephoto end, and Fw is the total effective focal length of the zoom lens at the wide-angle end. By reasonably controlling the total effective focal length of the zoom lens at the telephoto end and the total effective focal length of the zoom lens at the wide-angle end, the lens can achieve a zoom ratio of 2.18X or higher. For example, the zoom lens can also satisfy: 2 ≤ Ft / Fw ≤ 3.2, which is even more conducive to achieving a zoom ratio of 2.18X or higher.

[0080] In an exemplary embodiment, the zoom lens satisfies: 0.4 ≤ Ft / TTL ≤ 0.8, where Ft is the total effective focal length of the zoom lens at its telephoto end, and TTL is the on-axis distance from the object-side surface of the first lens to the imaging plane of the zoom lens. By controlling the above conditions, the length of the zoom lens can be effectively limited, thereby facilitating the miniaturization of the zoom lens. Exemplarily, the zoom lens may also satisfy: 0.4 ≤ Ft / TTL ≤ 0.7.

[0081] In an exemplary embodiment, the zoom lens satisfies: 0.15 ≤ Fw / TTL ≤ 0.4, where Fw is the total effective focal length of the zoom lens at the wide-angle end, and TTL is the on-axis distance from the object-side surface of the first lens to the imaging plane of the zoom lens. By controlling the above conditions, the length of the zoom lens can be effectively limited, thereby facilitating the miniaturization of the zoom lens. Exemplarily, the zoom lens can also satisfy: 0.15 ≤ Fw / TTL ≤ 0.25, which can further effectively limit the length of the zoom lens and achieve miniaturization.

[0082] In an exemplary embodiment, the zoom lens satisfies: 5.75 ≤ TTL / d2 ≤ 8, where TTL is the axial distance from the object-side surface of the first lens to the imaging plane of the zoom lens, and d2 is the axial distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end. By controlling the above conditions, the zoom lens of this application has a faster zoom speed and improved zoom efficiency. For example, the zoom lens can also satisfy: 6 ≤ TTL / d2 ≤ 7.8, which is even more conducive to achieving a faster zoom speed and improved zoom efficiency for the zoom lens of this application.

[0083] In an exemplary embodiment, the zoom lens satisfies: 0.3 ≤ 100 d4 / TTL≤3.5, where TTL is the axial distance from the object-side surface of the first lens to the imaging plane of the zoom lens, and d4 is the axial distance between the position of the fourth lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the fourth lens group on the optical axis when the zoom lens is at the telephoto end. By controlling the above conditions, the zoom lens of this application has a faster focusing speed, enabling the lens to focus quickly during zooming and ensuring the sharpness of the image. For example, the zoom lens may also satisfy: 0.3≤100 A d4 / TTL ≤ 3.2 can make the zoom lens of this application have a faster focusing speed, enabling the lens to focus quickly during zooming, and further helping to ensure the clarity of the image.

[0084] In an exemplary embodiment, the zoom lens satisfies: 3.5 ≤ ΦG1 / H ≤ 5.6, where ΦG1 is the maximum full aperture of the lenses in the first lens group, and H is the full image height of the zoom lens. By reasonably constraining the maximum full aperture of the lenses in the first lens group while meeting the requirement of a large target surface, it helps to achieve miniaturization of the lens. For example, the zoom lens can also satisfy: 3.75 ≤ ΦG1 / H ≤ 5.35, which is even more conducive to miniaturization while meeting the requirement of a large target surface.

[0085] In an exemplary embodiment, the zoom lens satisfies: -3.9 ≤ f7 / FG2 ≤ -1.9, where f7 is the effective focal length of the seventh lens and FG2 is the effective focal length of the second lens group. By controlling the above conditions, the seventh lens has a short focal length to converge light, thereby ensuring the amount of light transmitted through the lens. For example, the zoom lens can also satisfy: -3.7 ≤ f7 / FG2 ≤ -2.2, which is even more conducive to the seventh lens having a short focal length for converging light, further ensuring the amount of light transmitted through the lens.

[0086] In an exemplary embodiment, the zoom lens satisfies: 0 < |f16 / FG5| ≤ 3.3, where f16 is the effective focal length of the sixteenth lens and FG5 is the effective focal length of the fifth lens group. Controlling these conditions helps to smoothly diffuse light and simultaneously elevate the light beam, resulting in a larger target surface. For example, the zoom lens can also satisfy: 0 < |f16 / FG5| ≤ 0.55, which further facilitates smooth light diffusion and elevates the light beam, achieving an even larger target surface.

[0087] In an exemplary embodiment, the zoom lens satisfies: 0 < 1 - 2Ft tan(FOV_t / 2) / H ≤ 0.045, where Ft is the total effective focal length of the zoom lens at the telephoto end, and FOV_t is the full field of view of the zoom lens at the telephoto end. By controlling the relationship between the total effective focal length and the full field of view of the zoom lens at the telephoto end, the ratio of the actual image height to the theoretical image height can be controlled within a suitable range, which is beneficial for achieving low distortion. For example, a zoom lens can also satisfy: 0 < 1 - 2Ft tan(FOV_t / 2) / H≤0.04.

[0088] In an exemplary embodiment, the zoom lens satisfies: 4.3 ≤ TTL / H ≤ 5, where TTL is the axial distance from the object-side surface of the first lens to the imaging plane of the zoom lens, and H is the full image height of the zoom lens. Controlling these conditions helps improve the lens's resolving power while reducing costs. It should be noted that when TTL / H is less than the lower limit of the aforementioned range, the aberration balance of the zoom lens at the telephoto end is limited, making it difficult to improve the lens's resolving power; when TTL / H is greater than the upper limit of the aforementioned range, the zoom lens becomes larger, zoom efficiency is lower, and costs increase. For example, the zoom lens can also satisfy: 4.4 ≤ TTL / H ≤ 4.7, which is even more conducive to improving the lens's resolving power.

[0089] In an exemplary embodiment, the holographic height H of the zoom lens of this application can satisfy: 15mm≤H≤18mm, more specifically, H can satisfy 15.98mm≤H≤17.47mm.

[0090] In an exemplary embodiment, the aperture number Fno of the zoom lens of this application is constant, for example, Fno is 6.0 or 7.0.

[0091] In an exemplary embodiment, the optical distortion DIS of the zoom lens of this application at the wide-angle end satisfies: -0.5%≤DIS≤-0.28%, and the optical distortion DIS of the zoom lens at the telephoto end satisfies: 0.1%≤DIS≤0.48%, thus exhibiting low distortion characteristics.

[0092] In an exemplary embodiment, the zoom lens of this application has a wide range of object distances, for example, from 0.15mm to infinity.

[0093] In an exemplary embodiment, this application utilizes a combination of spherical and aspherical lenses, which helps reduce the processing difficulty of the lenses. Simultaneously, through material selection, a heat-free design can be achieved. This application does not specifically limit the number of spherical and aspherical lenses; when image quality is paramount, the number of aspherical lenses can be increased, or even all lenses can be aspherical. The characteristic of an aspherical lens is that its curvature changes continuously from the center to the periphery. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspherical lenses have better radius of curvature characteristics, offering advantages in improving distortion and astigmatism. Using aspherical lenses can minimize aberrations that occur during imaging, thereby improving the lens's image quality. For example, the seventh lens is a meniscus aspherical mirror, which helps correct field curvature and distortion at different focal lengths, achieving low lens distortion and effectively improving lens resolution.

[0094] The zoom lens of this application can adopt an all-glass lens structure. Using glass in the zoom lens can suppress the shift in back focus due to temperature changes, thereby improving system stability. Simultaneously, using glass avoids image blurring caused by high and low temperature changes in the operating environment, ensuring normal lens use, facilitating heat-free lens operation, and also better correcting chromatic aberration, thus improving lens resolution. The all-glass zoom lens in this application has a wide temperature range, maintaining stable optical performance within the range of -40℃ to 85℃.

[0095] The zoom lens of this application adopts a five-group architecture of fixed + zoom + fixed + compensation + fixed. More specifically, the five-group architecture includes a first lens group with positive optical power, a second lens group with negative optical power, a third lens group with positive optical power, a fourth lens group with positive optical power, and a fifth lens group with either positive or negative optical power. It also includes an aperture stop set between the second and third lens groups, which can effectively correct field curvature and distortion, while meeting the usage requirements of large target areas (the maximum imaging target area can reach 17.77mm).

[0096] The zoom lens of this application has excellent resolution, with a resolution of 8K or higher.

[0097] Alternatively, in other alternative exemplary embodiments, the zoom lens described above may also be equipped with a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0098] However, those skilled in the art will understand that the number of lenses constituting the zoom lens can be changed to obtain the various results and advantages described in this specification without departing from the technical solutions claimed in this application. For example, although sixteen or eighteen lenses are described as examples in the embodiments, the zoom lens is not limited to including sixteen or eighteen lenses. If desired, the zoom lens may also include other numbers of lenses.

[0099] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the zoom lens applicable to the above-described embodiments.

[0100] Example 1

[0101] The following is for reference Figures 1 to 4 A zoom lens according to Embodiment 1 of this application is described. Figure 1 This is a schematic diagram of the zoom lens in Embodiment 1 of this application when it is at the wide-angle end. Figure 2 This is a schematic diagram of the zoom lens in Embodiment 1 of this application when it is at the telephoto end.

[0102] like Figure 1 and Figure 2 As shown, the zoom lens, along the optical axis from the object side to the image side, sequentially includes: a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and an imaging plane IMA. The first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed groups, and their positions relative to the imaging plane IMA of the zoom lens are fixed. The second lens group G2 is the zoom group, and the fourth lens group G4 is the compensation group. The second lens group G2 and the fourth lens group G4 can move along the optical axis between the object side and the image side, enabling the zoom lens to achieve continuous zoom between the wide-angle end and the telephoto end.

[0103] The first lens group G1, along the optical axis from the object side to the image side, includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in sequence. The first lens L1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens L2 has positive optical power, with its object-side surface S2 being convex and its image-side surface S3 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. The fourth lens L4 has positive optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. The first lens L1 and the second lens L2 are cemented together to form a cemented doublet lens.

[0104] The second lens group G2 includes, sequentially from the object side to the image side, a fifth lens L5, a sixth lens L6, and a seventh lens L7. 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. The seventh lens L7 has positive optical power, with its object side S12 being convex and its image side S13 being concave.

[0105] The third lens group G3, along the optical axis from the object side to the image side, includes, in sequence, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, and a twelfth lens L12. The eighth lens L8 has positive optical power, with both its object-side surface S15 and image-side surface S16 being convex. The ninth lens L9 has positive optical power, with both its object-side surface S17 and image-side surface S18 being convex. The tenth lens L10 has negative optical power, with both its object-side surface S18 and image-side surface S19 being concave. The eleventh lens L11 has negative optical power, with both its object-side surface S20 and image-side surface S21 being concave. The twelfth lens L12 has positive optical power, with both its object-side surface S21 and image-side surface S22 being convex. The ninth lens L9 and the tenth lens L10 are cemented together to form a cemented doublet lens, and the eleventh lens L11 and the twelfth lens L12 are cemented together to form another cemented doublet lens.

[0106] The fourth lens group G4, along the optical axis from the object side to the image side, includes a first auxiliary lens L41, a thirteenth lens L13, and a fourteenth lens L14 in sequence. The first auxiliary lens L41 has negative optical power, with its object-side surface S23 being convex and its image-side surface S24 being concave. The thirteenth lens L13 has positive optical power, with its object-side surface S25 being convex and its image-side surface S26 being convex. The fourteenth lens L14 has negative optical power, with its object-side surface S26 being concave and its image-side surface S27 being convex. The thirteenth lens L13 and the fourteenth lens L14 are cemented together to form a cemented doublet lens.

[0107] The fifth lens group G5, along the optical axis from the object side to the image side, sequentially includes the fifteenth lens L15, the second auxiliary lens L52, and the sixteenth lens L16. The fifteenth lens L15 has negative optical power, with its object-side surface S28 being concave and its image-side surface S29 being concave. The second auxiliary lens L52 has positive optical power, with its object-side surface S29 being convex and its image-side surface S30 being convex. The sixteenth lens L16 has positive optical power, with its object-side surface S31 being convex and its image-side surface S32 being convex. The fifteenth lens L15 and the second auxiliary lens L52 are cemented together to form a cemented doublet lens.

[0108] The zoom lens may further include an aperture stop STO (surface S14) disposed between the second lens group G2 and the third lens group G3. More specifically, the aperture stop STO may be disposed between the seventh lens L7 and the eighth lens L8. Optionally, the zoom lens may further include a filter having a first side surface S33 and a second side surface S34 and / or a protective glass (not shown) having a first side surface and a second side surface. Light from the object passes sequentially through each surface S1 to S34 and is finally imaged on the imaging surface IMA. It should be noted that surfaces S1 to S34 are in... Figure 1 and Figure 2 Not shown in the image.

[0109] Table 1 shows the basic parameters of the zoom lens of Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0110] Table 1

[0111]

[0112] In Embodiment 1 and the following embodiments, by changing the position of the second lens group G2 on the optical axis, the zoom lens can be switched from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, so that the total effective focal length of the zoom lens can be continuously variable. At the same time, by adjusting the position of the fourth lens group G4 on the optical axis, the zoom lens can achieve clear focus on the imaging plane during the zooming process.

[0113] In Example 1, the constant aperture Fno of the zoom lens is 6.0. Table 2 shows the values ​​of T0, T1, T2, and T3 in Table 1 when the zoom lens is at the wide-angle, mid-range, and telephoto ends, respectively. It can be understood that the mid-range end is the state when the zoom lens is between the wide-angle and telephoto ends. Table 2 also shows the values ​​of the total effective focal length F, optical distortion value DIS, full field of view FOV, holographic height H, and on-axis distance TTL from the object side of the first lens to the imaging plane of the zoom lens when the zoom lens is at the wide-angle and telephoto ends, respectively. Among them, F, DIS, and FOV change as the zoom lens is switched from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, while H and TTL remain unchanged. In Table 2, the units of F, H, TTL, T0, T1, T2, and T3 are all millimeters (mm), the unit of FOV is degrees (°), and the unit of DIS is %.

[0114] Table 2

[0115]

[0116] It should be noted that in Example 1, both the object-side surface and the image-side surface of each lens are spherical.

[0117] Figure 3 and Figure 4These are distortion images of the zoom lens in Embodiment 1 of this application at the wide-angle and telephoto ends, respectively. Figure 3 and Figure 4 It can be seen that the zoom lens provided in Example 1 can achieve good imaging quality at different focal lengths.

[0118] Example 2

[0119] The following is for reference Figures 5 to 8 This application describes the zoom lens of Embodiment 2. Figure 5 This is a schematic diagram of the zoom lens in Embodiment 2 of this application when it is at the wide-angle end. Figure 6 This is a schematic diagram of the zoom lens in Embodiment 2 of this application when it is at the telephoto end.

[0120] like Figure 5 and Figure 6 As shown, the zoom lens, along the optical axis from the object side to the image side, sequentially includes: a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with positive optical power, and an imaging plane IMA. The first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed groups, and their positions relative to the imaging plane IMA of the zoom lens are fixed. The second lens group G2 is the zoom group, and the fourth lens group G4 is the compensation group. The second lens group G2 and the fourth lens group G4 can move along the optical axis between the object side and the image side, enabling the zoom lens to achieve continuous zoom between the wide-angle end and the telephoto end.

[0121] The first lens group G1, along the optical axis from the object side to the image side, includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in sequence. The first lens L1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens L2 has positive optical power, with its object-side surface S2 being convex and its image-side surface S3 being flat. The third lens L3 has positive optical power, with its object-side surface S4 being convex and its image-side surface S5 being concave. The fourth lens L4 has positive optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. The first lens L1 and the second lens L2 are cemented together to form a cemented doublet lens.

[0122] The second lens group G2 includes, sequentially from the object side to the image side, a fifth lens L5, a sixth lens L6, and a seventh lens L7. 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. The seventh lens L7 has positive optical power, with its object side S12 being convex and its image side S13 being concave.

[0123] The third lens group G3, along the optical axis from the object side to the image side, includes, in sequence, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, and the twelfth lens L12. The eighth lens L8 has positive optical power, with both its object-side surface S15 and image-side surface S16 being convex. The ninth lens L9 has positive optical power, with both its object-side surface S17 and image-side surface S18 being convex. The tenth lens L10 has negative optical power, with both its object-side surface S18 and image-side surface S19 being concave. The eleventh lens L11 has negative optical power, with both its object-side surface S20 and image-side surface S21 being concave. The twelfth lens L12 has positive optical power, with both its object-side surface S21 and image-side surface S22 being convex. The ninth lens L9 and the tenth lens L10 are cemented together to form a cemented doublet lens, and the eleventh lens L11 and the twelfth lens L12 are cemented together to form another cemented doublet lens.

[0124] The fourth lens group G4, along the optical axis from the object side to the image side, includes a first auxiliary lens L41, a thirteenth lens L13, and a fourteenth lens L14 in sequence. The first auxiliary lens L41 has negative optical power, with its object-side surface S23 being convex and its image-side surface S24 being concave. The thirteenth lens L13 has positive optical power, with its object-side surface S25 being convex and its image-side surface S26 being convex. The fourteenth lens L14 has negative optical power, with its object-side surface S26 being concave and its image-side surface S27 being concave. The thirteenth lens L13 and the fourteenth lens L14 are cemented together to form a cemented doublet lens.

[0125] The fifth lens group G5, along the optical axis from the object side to the image side, sequentially includes a fifteenth lens L15, a second auxiliary lens L52, and a sixteenth lens L16. The fifteenth lens L15 has negative optical power, with its object-side surface S28 being concave and its image-side surface S29 being concave. The second auxiliary lens L52 has positive optical power, with its object-side surface S29 being convex and its image-side surface S30 being convex. The sixteenth lens L16 has positive optical power, with its object-side surface S31 being concave and its image-side surface S32 being convex. The fifteenth lens L15 and the second auxiliary lens L52 are cemented together to form a cemented doublet lens.

[0126] The zoom lens may further include an aperture stop STO (surface S14) disposed between the second lens group G2 and the third lens group G3. More specifically, the aperture stop STO may be disposed between the seventh lens L7 and the eighth lens L8. Optionally, the zoom lens may further include a filter having a first side surface S33 and a second side surface S34 and / or a protective glass (not shown) having a first side surface and a second side surface. Light from the object passes sequentially through each surface S1 to S34 and is finally imaged on the imaging surface IMA. It should be noted that surfaces S1 to S34 are in... Figure 5 and Figure 6 Not shown in the image.

[0127] Table 3 shows the basic parameters of the zoom lens in Example 2, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0128] Table 3

[0129]

[0130] In Example 2, the constant aperture Fno of the zoom lens is 6.0. Table 4 shows the values ​​of T0, T1, T2, and T3 from Table 3 when the zoom lens is at the wide-angle, mid-range, and telephoto ends, respectively. It can be understood that the mid-range end refers to the zoom lens's position between the wide-angle and telephoto ends. Table 4 also shows the values ​​of the total effective focal length F, optical distortion value DIS, field of view (FOV), holographic height H, and on-axis distance TTL from the object side of the first lens to the imaging plane of the zoom lens when the zoom lens is at the wide-angle and telephoto ends, respectively. F, DIS, and FOV change as the zoom lens switches from wide-angle to telephoto or vice versa, while H and TTL remain constant. In Table 4, the units for F, H, TTL, T0, T1, T2, and T3 are millimeters (mm), the unit for FOV is degrees (°), and the unit for DIS is %.

[0131] Table 4

[0132]

[0133] In Example 2, the object-side surface S12 and image-side surface S13 of the seventh lens L7 are both aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0134] (1);

[0135] Where x is the distance vector from the vertex of the aspherical surface at a height 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 3 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 5 below gives the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical mirror in Example 2.

[0136] Table 5

[0137]

[0138] Figure 7 and Figure 8 These are distortion images of the zoom lens in Embodiment 2 of this application at the wide-angle and telephoto ends, respectively. Figure 7 and Figure 8It can be seen that the zoom lens provided in Example 2 can achieve good imaging quality at different focal lengths.

[0139] Example 3

[0140] The following is for reference Figures 9 to 12 The zoom lens of Embodiment 3 of this application is described. Figure 9 This is a schematic diagram of the zoom lens in Embodiment 3 of this application when it is at the wide-angle end. Figure 10 This is a schematic diagram of the zoom lens in Embodiment 3 of this application when it is at the telephoto end.

[0141] like Figure 9 and Figure 10 As shown, the zoom lens, along the optical axis from the object side to the image side, sequentially includes: a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with positive optical power, and an imaging plane IMA. The first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed groups, and their positions relative to the imaging plane IMA of the zoom lens are fixed. The second lens group G2 is the zoom group, and the fourth lens group G4 is the compensation group. The second lens group G2 and the fourth lens group G4 can move along the optical axis between the object side and the image side, enabling the zoom lens to achieve continuous zoom between the wide-angle end and the telephoto end.

[0142] The first lens group G1, along the optical axis from the object side to the image side, includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in sequence. The first lens L1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens L2 has positive optical power, with its object-side surface S2 being convex and its image-side surface S3 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. The fourth lens L4 has positive optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. The first lens L1 and the second lens L2 are cemented together to form a cemented doublet lens.

[0143] The second lens group G2 includes, sequentially from the object side to the image side, a fifth lens L5, a sixth lens L6, and a seventh lens L7. 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. The seventh lens L7 has positive optical power, with its object side S12 being convex and its image side S13 being concave.

[0144] The third lens group G3, along the optical axis from the object side to the image side, includes, in sequence, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, and the twelfth lens L12. The eighth lens L8 has positive optical power, with both its object-side surface S15 and image-side surface S16 being convex. The ninth lens L9 has positive optical power, with both its object-side surface S17 and image-side surface S18 being convex. The tenth lens L10 has negative optical power, with both its object-side surface S18 and image-side surface S19 being concave. The eleventh lens L11 has negative optical power, with its object-side surface S20 being concave and its image-side surface S21 being convex. The twelfth lens L12 has positive optical power, with its object-side surface S21 being concave and its image-side surface S22 being convex. The ninth lens L9 and the tenth lens L10 are cemented together to form a cemented doublet, and the eleventh lens L11 and the twelfth lens L12 are cemented together to form another cemented doublet.

[0145] The fourth lens group G4, along the optical axis from the object side to the image side, includes a first auxiliary lens L41, a thirteenth lens L13, and a fourteenth lens L14 in sequence. The first auxiliary lens L41 has negative optical power, with its object-side surface S23 being convex and its image-side surface S24 being concave. The thirteenth lens L13 has positive optical power, with its object-side surface S25 being convex and its image-side surface S26 being convex. The fourteenth lens L14 has positive optical power, with its object-side surface S26 being concave and its image-side surface S27 being convex. The thirteenth lens L13 and the fourteenth lens L14 are cemented together to form a cemented doublet lens.

[0146] The fifth lens group G5, along the optical axis from the object side to the image side, sequentially includes the fifteenth lens L15, the second auxiliary lens L52, and the sixteenth lens L16. The fifteenth lens L15 has negative optical power, with its object-side surface S28 being concave and its image-side surface S29 being concave. The second auxiliary lens L52 has positive optical power, with its object-side surface S29 being convex and its image-side surface S30 being convex. The sixteenth lens L16 has positive optical power, with its object-side surface S31 being convex and its image-side surface S32 being convex. The fifteenth lens L15 and the second auxiliary lens L52 are cemented together to form a cemented doublet lens.

[0147] The zoom lens may further include an aperture stop STO (surface S14) disposed between the second lens group G2 and the third lens group G3. More specifically, the aperture stop STO may be disposed between the seventh lens L7 and the eighth lens L8. Optionally, the zoom lens may further include a filter having a first side surface S33 and a second side surface S34 and / or a protective glass (not shown) having a first side surface and a second side surface. Light from the object passes sequentially through each surface S1 to S34 and is finally imaged on the imaging surface IMA. It should be noted that surfaces S1 to S34 are in... Figure 9 and Figure 10 Not shown in the image.

[0148] Table 6 shows the basic parameters of the zoom lens of Example 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0149] Table 6

[0150]

[0151] In Example 3, the constant aperture Fno of the zoom lens is 6.0. Table 7 shows the values ​​of T0, T1, T2, and T3 from Table 6 when the zoom lens is at the wide-angle, mid-range, and telephoto ends, respectively. It can be understood that the mid-range end refers to the zoom lens's position between the wide-angle and telephoto ends. Table 7 also shows the values ​​of the total effective focal length F, optical distortion value DIS, field of view (FOV), holographic height H, and on-axis distance TTL from the object side of the first lens to the imaging plane of the zoom lens when the zoom lens is at the wide-angle and telephoto ends, respectively. F, DIS, and FOV change as the zoom lens switches from wide-angle to telephoto or vice versa, while H and TTL remain constant. In Table 7, the units for F, H, TTL, T0, T1, T2, and T3 are millimeters (mm), FOV is in degrees (°), and DIS is in degrees (°).

[0152] Table 7

[0153]

[0154] In Example 3, the object-side surface S12 and image-side surface S13 of the seventh lens L7 are both aspherical. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 2 above. Table 8 below gives the conic coefficient k and higher-order coefficients A4, A6, A8, A10, and A12 that can be used for each aspherical lens in Example 3.

[0155] Table 8

[0156]

[0157] Figure 11 and Figure 12 These are distortion images of the zoom lens in Embodiment 3 of this application at the wide-angle and telephoto ends, respectively. Figure 11 and Figure 12 It can be seen that the zoom lens provided in Example 3 can achieve good imaging quality at different focal lengths.

[0158] Example 4

[0159] The following is for reference Figures 13 to 16 The zoom lens of Embodiment 4 of this application is described. Figure 13 This is a schematic diagram of the zoom lens in embodiment 4 of this application when it is at the wide-angle end. Figure 13This is a schematic diagram of the zoom lens in Embodiment 4 of this application when it is at the telephoto end.

[0160] like Figure 13 and Figure 14 As shown, the zoom lens, along the optical axis from the object side to the image side, sequentially includes: a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and an imaging plane IMA. The first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed groups, and their positions relative to the imaging plane IMA of the zoom lens are fixed. The second lens group G2 is the zoom group, and the fourth lens group G4 is the compensation group. The second lens group G2 and the fourth lens group G4 can move along the optical axis between the object side and the image side, enabling the zoom lens to achieve continuous zoom between the wide-angle end and the telephoto end.

[0161] The first lens group G1, along the optical axis from the object side to the image side, includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in sequence. The first lens L1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens L2 has positive optical power, with its object-side surface S2 being convex and its image-side surface S3 being convex. The third lens L3 has positive optical power, with its object-side surface S4 being convex and its image-side surface S5 being concave. The fourth lens L4 has positive optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. The first lens L1 and the second lens L2 are cemented together to form a cemented doublet lens.

[0162] The second lens group G2 includes, sequentially from the object side to the image side, a fifth lens L5, a sixth lens L6, and a seventh lens L7. 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. The seventh lens L7 has positive optical power, with its object side S12 being convex and its image side S13 being concave.

[0163] The third lens group G3, along the optical axis from the object side to the image side, includes, in sequence, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, and the twelfth lens L12. The eighth lens L8 has positive optical power, with both its object-side surface S15 and image-side surface S16 being convex. The ninth lens L9 has positive optical power, with both its object-side surface S17 and image-side surface S18 being convex. The tenth lens L10 has negative optical power, with both its object-side surface S18 and image-side surface S19 being concave. The eleventh lens L11 has negative optical power, with its object-side surface S20 being concave and its image-side surface S21 being convex. The twelfth lens L12 has positive optical power, with its object-side surface S21 being concave and its image-side surface S22 being convex. The ninth lens L9 and the tenth lens L10 are cemented together to form a cemented doublet, and the eleventh lens L11 and the twelfth lens L12 are cemented together to form another cemented doublet.

[0164] The fourth lens group G4 includes, sequentially from the object side to the image side, a thirteenth lens L13 and a fourteenth lens L14. The thirteenth lens L13 has negative optical power, with its object-side surface S23 being convex and its image-side surface S24 being concave. The fourteenth lens L14 has positive optical power, with its object-side surface S24 being convex and its image-side surface S25 being convex. The thirteenth lens L13 and the fourteenth lens L14 are cemented together to form a cemented doublet lens.

[0165] The fifth lens group G5 includes, sequentially from the object side to the image side, the fifteenth lens L15 and the sixteenth lens L16 along the optical axis. The fifteenth lens L15 has negative optical power, with its object side S26 being concave and its image side S27 being convex. The sixteenth lens L16 has positive optical power, with its object side S28 being convex and its image side S29 being convex.

[0166] The zoom lens may further include an aperture stop STO (surface S14) disposed between the second lens group G2 and the third lens group G3. More specifically, the aperture stop STO may be disposed between the seventh lens L7 and the eighth lens L8. Optionally, the zoom lens may further include a filter having a first side surface S30 and a second side surface S31 and / or a protective glass (not shown) having a first side surface and a second side surface. Light from the object passes sequentially through each surface S1 to S31 and is finally imaged on the imaging surface IMA. It should be noted that surfaces S1 to S31 are in... Figure 13 and Figure 14 Not shown in the image.

[0167] Table 9 shows the basic parameters of the zoom lens in Example 4, where the radius of curvature and thickness / distance are in millimeters (mm).

[0168] Table 9

[0169]

[0170] In Example 4, the constant aperture Fno of the zoom lens is 6.0. Table 10 shows the values ​​of T0, T1, T2, and T3 from Table 9 when the zoom lens is at the wide-angle, mid-range, and telephoto ends, respectively. It can be understood that the mid-range end refers to the state when the zoom lens is between the wide-angle and telephoto ends. Table 10 also shows the values ​​of the total effective focal length F, optical distortion value DIS, field of view (FOV), holographic height H, and on-axis distance TTL from the object side of the first lens to the imaging plane of the zoom lens when the zoom lens is at the wide-angle and telephoto ends, respectively. F, DIS, and FOV change as the zoom lens switches from the wide-angle to the telephoto end or vice versa, while H and TTL remain constant. In Table 10, the units for F, H, TTL, T0, T1, T2, and T3 are millimeters (mm), the unit for FOV is degrees (°), and the unit for DIS is %.

[0171] Table 10

[0172]

[0173] In Example 4, the object-side surface S12 and image-side surface S13 of the seventh lens L7 are both aspherical. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 2 above. Table 11 below gives the conic coefficient k and higher-order coefficients A4, A6, A8, A10, and A12 that can be used for each aspherical lens in Example 4.

[0174] Table 11

[0175]

[0176] Figure 15 and Figure 16 These are distortion images of the zoom lens in Embodiment 4 of this application at the wide-angle and telephoto ends, respectively. Figure 15 and Figure 16 It can be seen that the zoom lens provided in Example 4 can achieve good image quality at different focal lengths.

[0177] Table 12 provides the parameter values ​​for the zoom lens in each of Examples 1-4. The unit of FOV_t is degrees (°), and the units for the other parameters are millimeters (mm).

[0178] Table 12

[0179]

[0180] In summary, the zoom lenses in Examples 1 to 4 respectively satisfy the relationships shown in Table 13.

[0181] Table 13

[0182]

[0183] 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, In order from the object side to the image side along the optical axis, the zoom lens comprises: a first lens group with positive refractive power, which is a fixed group; a second lens group with negative refractive power, which is a variable group; a third lens group with positive refractive power, which is a fixed group; a fourth lens group with positive refractive power, which is a compensation group; and a fifth lens group with positive or negative refractive power, which is a fixed group; wherein the first lens group comprises, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens and a fourth lens; the second lens group comprises, in order from the object side to the image side along the optical axis, a fifth lens, a sixth lens and a seventh lens; the third lens group comprises, in order from the object side to the image side along the optical axis, an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens; the fourth lens group comprises, in order from the object side to the image side along the optical axis, a thirteenth lens and a fourteenth lens; the fifth lens group comprises, in order from the object side to the image side along the optical axis, a fifteenth lens and a sixteenth lens; the second lens group moves between the object side and the image side along the optical axis to achieve continuous zooming between a wide-angle end and a telephoto end; the fourth lens group moves between the object side and the image side along the optical axis to achieve compensation for changes in the position of the imaging plane during zooming; the number of lens groups with refractive power in the zoom lens is five; and the zoom lens satisfies 2.1≤FG1 / Fw≤3.1, where FG1 is the effective focal length of the first lens group and Fw is the total effective focal length of the zoom lens at the wide-angle end.

2. The zoom lens according to claim 1, wherein the first lens has negative refractive power; the second lens has positive refractive power; the third lens has positive refractive power; the fourth lens has positive refractive power.

3. The zoom lens according to claim 1, wherein the fifth lens has negative refractive power; the sixth lens has negative refractive power; the seventh lens has positive refractive power.

4. The zoom lens according to claim 1, wherein the eighth lens has positive refractive power; the ninth lens has positive refractive power; the tenth lens has negative refractive power; the eleventh lens has negative refractive power; the twelfth lens has positive refractive power.

5. The zoom lens according to claim 1, wherein the fifteenth lens has negative refractive power; the sixteenth lens has positive refractive power.

6. The zoom lens according to claim 1, characterized by the fourth lens group further comprises a first auxiliary lens located on the object side of the thirteenth lens; 7. The zoom lens according to claim 6, characterized by the first auxiliary lens has negative refractive power.

8. The zoom lens according to claim 1, characterized by the fifth lens group further comprises a second auxiliary lens located between the fifteenth lens and the sixteenth lens; 9. The zoom lens according to claim 8, characterized by the second auxiliary lens has positive refractive power.

10. The zoom lens according to any one of claims 1 to 9, characterized by the zoom lens satisfies -1≤FG2 / Fw≤-0.5, where FG2 is the effective focal length of the second lens group.

11. The zoom lens according to any one of claims 1 to 9, characterized by The zoom lens satisfies: 0.9≤FG3 / Fw≤1.7, wherein FG3 is an effective focal length of the third lens group.

12. The zoom lens according to any one of claims 1 to 9, characterized by The zoom lens satisfies: 1≤FG4 / Fw≤3, wherein FG4 is an effective focal length of the fourth lens group.

13. The zoom lens according to any one of claims 1 to 9, wherein The zoom lens satisfies: 3≤|FG5 / Fw|≤13, wherein FG5 is an effective focal length of the fifth lens group.

14. The zoom lens according to any one of claims 1 to 9, wherein The zoom lens satisfies: 2≤Ft / Fw≤3.5, wherein Ft is a total effective focal length of the zoom lens when the zoom lens is at a telephoto end.

15. The zoom lens according to any one of claims 1 to 9, wherein The zoom lens satisfies: 0.4≤Ft / TTL≤0.8, wherein Ft is a total effective focal length of the zoom lens when the zoom lens is at a telephoto end, and TTL is an axial distance from an object side of the first lens to an image plane of the zoom lens.

16. The zoom lens according to any one of claims 1 to 9, wherein The zoom lens satisfies: 0.15≤Fw / TTL≤0.4, wherein TTL is an axial distance from an object side of the first lens to an image plane of the zoom lens.

17. The zoom lens according to any one of claims 1 to 9, wherein The zoom lens satisfies: 5.75≤TTL / d2≤8, wherein TTL is an axial distance from an object side of the first lens to an image plane of the zoom lens, and d2 is an axial distance between a position of the second lens group on the optical axis when the zoom lens is at a wide-angle end and a position of the second lens group on the optical axis when the zoom lens is at a telephoto end.

18. The zoom lens according to any one of claims 1 to 9, wherein The zoom lens satisfies: 0.3≤100 d4 / TTL≤3.5, where TTL is the on-axis distance from the object side surface of the first lens to the image plane of the zoom lens, and d4 is the on-axis distance between the position of the fourth lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the fourth lens group on the optical axis when the zoom lens is at the telephoto end.

19. The zoom lens according to any one of claims 1 to 9, wherein The zoom lens satisfies: 3.5≤ΦG1 / H≤5.6, wherein ΦG1 is a maximum full aperture of a lens in the first lens group, and H is a full image height of the zoom lens.

20. The zoom lens according to any one of claims 1 to 9, wherein The zoom lens satisfies: -3.9≤f7 / FG2≤-1.9, wherein f7 is an effective focal length of the seventh lens, and FG2 is an effective focal length of the second lens group.

21. The zoom lens according to any one of claims 1 to 9, wherein The zoom lens satisfies: 0 22. The zoom lens according to any one of claims 1 to 9, wherein The zoom lens satisfies: 0 < 1 - 2Ft tan(FOV_t / 2) / H ≤ 0.045, where Ft is a total effective focal length of the zoom lens at a telephoto end, and FOV_t is a full field of view angle of the zoom lens at the telephoto end.

23. The zoom lens according to any one of claims 1 to 9, wherein The zoom lens satisfies: 4.3≤TTL / H≤5, wherein TTL is an axial distance from an object side of the first lens to an image plane of the zoom lens, and H is a full image height of the zoom lens.

24. The zoom lens according to any one of claims 1 to 9, wherein The zoom lens satisfies at least one of the following: 2.2 < FG1 / Fw < 2.95; -1 < FG2 / Fw < -0.55; 0.95 < FG3 / Fw < 1.58; 1.25 < FG4 / Fw < 2.7; 3.3 < |FG5 / Fw| < 12.6; 2.0 < Ft / Fw < 3.2; 0.4 < Ft / TTL < 0.7; 0.15 < Fw / TTL < 0.25; 6 < TTL / d2 < 7.8; 0.3 < 100 d4 / TTL < 3.2; 3.75 < ΦG1 / H < 5.35; -3.7 < f7 / FG2 < -2.2; 0 < |f16 / FG5| < 0.498; 0 < 1-2Ft tan(FOV_t / 2) / H < 0.04; 4.4 < TTL / H < 4.7; Wherein 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, FG5 is the effective focal length of the fifth lens group, Ft is the total effective focal length when the zoom lens is at the tele end, TTL is the axial distance from the object side of the first lens to the image plane of the zoom lens, ΦG1 is the maximum full aperture of the lens in the first lens group, H is the full image height of the zoom lens, d2 is the axial distance between the position of the second lens group on the optical axis when the zoom lens is at the wide end and the position of the second lens group on the optical axis when the zoom lens is at the tele end, d4 is the axial distance between the position of the fourth lens group on the optical axis when the zoom lens is at the wide end and the position of the fourth lens group on the optical axis when the zoom lens is at the tele end, f7 is the effective focal length of the seventh lens, f16 is the effective focal length of the sixteenth lens, FOV_t is the full field of view angle when the zoom lens is at the tele end.

Images