A zoom lens

Abstract

The application discloses a zoom lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group in sequence from an object side to an image side along an optical axis, wherein the first lens group is a focusing group with negative refractive power; the second lens group is a zoom group with positive refractive power; the third lens group is a fixed group with negative refractive power; the fourth lens group is a zoom group with positive refractive power; and the fifth lens group is a fixed group or a zoom 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, such as: existing zoom lenses usually have a small imaging target size and low image resolution; existing zoom lenses often have insufficient wide-angle angles, resulting in limited monitoring range; in addition, existing zoom lenses have significant distortion at certain angles; furthermore, existing zoom lenses generally use a large number of lenses, resulting in 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 wide angle, low distortion, and large focal length 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, a fourth lens group, and a fifth lens group, wherein the first lens group is a focusing group with negative optical power; the second lens group is a zoom group with positive optical power; the third lens group is a fixed group with negative optical power; the fourth lens group is a zoom group with positive optical power; and the fifth lens group is either a fixed group or a zoom 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 negative 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 concave; the object-side surface of the second lens is concave and the image-side surface is concave; and the object-side surface of the third lens is convex and the image-side surface is convex.

[0008] In one embodiment, the second lens group may include a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side to the image side along the optical axis, wherein the sixth lens has positive optical power.

[0009] In one embodiment, the fourth lens and the fifth lens are cemented together to form a cemented doublet lens.

[0010] In one embodiment, the third lens group may include a seventh lens and an eighth lens arranged sequentially from the object side to the image side along the optical axis.

[0011] In one embodiment, the seventh lens and the eighth lens are cemented together to form a cemented doublet lens.

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

[0013] In one embodiment, the tenth lens, the eleventh lens, and the twelfth lens are cemented together to form a cemented triplet lens; and the thirteenth lens and the fourteenth lens are cemented together to form a cemented doublet lens.

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

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

[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 first lens group may include a first lens, a second lens, a third lens, and a fourth lens arranged sequentially from the object side to the image side along the optical axis, wherein the first lens has negative optical power; and the second lens has negative optical power.

[0018] In one embodiment, the object-side surface of the first lens is convex and the image-side surface is concave; and the object-side surface of the second lens is convex and the image-side surface is concave.

[0019] In one embodiment, the third lens and the fourth lens are cemented together to form a cemented doublet lens.

[0020] In one embodiment, the second lens group may include a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side to the image side along the optical axis, wherein the eighth lens has positive optical power.

[0021] In one embodiment, the fifth lens, the sixth lens, and the seventh lens are cemented together to form a cemented triplet lens.

[0022] In one embodiment, the third lens group may include a ninth lens, a tenth lens, and an eleventh lens arranged sequentially from the object side to the image side along the optical axis, wherein the ninth lens has negative optical power; the tenth lens has negative optical power; and the eleventh lens has positive optical power.

[0023] In one embodiment, the object-side surface of the ninth lens is concave, and the image-side surface is concave; the object-side surface of the tenth lens is concave, and the image-side surface is concave; and the object-side surface of the eleventh lens is convex, and the image-side surface is convex.

[0024] In one embodiment, the fourth lens group may include a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens, and a sixteenth lens arranged sequentially along the optical axis from the object side to the image side.

[0025] In one embodiment, the fourth lens group may include a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens, and a seventeenth lens arranged sequentially from the object side to the image side along the optical axis.

[0026] In one embodiment, the fifth lens group may include a seventeenth lens or an eighteenth lens.

[0027] 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: -2.8≤FG1 / Fw≤-1.8.

[0028] In one embodiment, the effective focal length FG2 of the second lens group and the focal length Fw of the zoom lens at the wide-angle end can satisfy: 2.8≤FG2 / Fw≤3.5.

[0029] 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: -5.1≤FG3 / Fw≤-2.7.

[0030] 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: 2.2≤FG4 / Fw≤3.7.

[0031] In one embodiment, the effective focal length FG5 of the fifth lens group and the focal length Fw of the zoom lens at the wide-angle end can satisfy: 3.9≤FG5 / Fw≤19.0.

[0032] In one embodiment, the combined focal length F12 of the first lens and the second lens and the effective focal length FG1 of the first lens group can satisfy: -0.9≤F12 / FG1≤-0.3.

[0033] In one embodiment, the effective focal length FG1 of the first lens group and the focal length Ft of the zoom lens at the telephoto end can satisfy: -1.1≤FG1 / Ft≤-0.5.

[0034] In one embodiment, the focal length Fj of a single lens in the second lens group and the effective focal length FG2 of the second lens group can satisfy: 0.8≤Fj / FG2≤1.8.

[0035] In one embodiment, the focal length Ft of the zoom lens at the telephoto end and the focal length Fw of the zoom lens at the wide-angle end can satisfy: 2.8≤Ft / Fw≤3.1.

[0036] In one embodiment, the total optical length TTL_t of the zoom lens at the telephoto end and the focal length Ft of the zoom lens at the telephoto end can satisfy: 3.7≤TTL_t / Ft≤4.6.

[0037] In one embodiment, the refractive index Ndi of at least four lenses included in the first to fifth lens groups can satisfy: 1.8 ≤ Ndi ≤ 1.95; and the Abbe number Vdi of at least four lenses included in the first to fifth lens groups can satisfy: 20 ≤ Vdi ≤ 50.

[0038] In one embodiment, the maximum optical aperture Dmax of the zoom lens and the total optical length TTL_w of the zoom lens at the wide-angle end can satisfy: 0.2≤Dmax / TTL_w≤0.5.

[0039] In one embodiment, the zoom lens includes an aperture stop, and the combined focal length Fa of the lens group located before the aperture stop and the combined focal length Fb of the lens group located after the aperture stop can satisfy: 0.3≤Fa / Fb≤0.8.

[0040] In one embodiment, the total optical length D1 of the first lens group and the total optical length TTL_w of the zoom lens at the wide-angle end can satisfy: 0.1≤D1 / TTL_w≤0.3.

[0041] In one embodiment, the total optical length TTL_w of the zoom lens at the wide-angle end and the holographic height H of the zoom lens can satisfy: 5.2≤TTL_w / H≤5.9.

[0042] In one embodiment, the back focal length BFL_w of the zoom lens at the wide-angle end and the focal length Fw of the zoom lens at the wide-angle end can satisfy: 0.5≤BFL_w / Fw≤1.3.

[0043] The zoom lens according to an embodiment of this application includes a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group arranged sequentially along the optical axis from the object side to the image side. The first lens group is a focusing group with negative optical power; the second lens group is a zoom group with positive optical power; the third lens group is a fixed group with negative optical power; the fourth lens group is a zoom group with positive optical power; and the fifth lens group is either a fixed group or a zoom group with positive optical power. This arrangement of the zoom lens allows it to achieve at least one of the following beneficial effects: wide-angle, low distortion, large sensor size, miniaturization, and high image quality. Attached Figure Description

[0044] 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:

[0045] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 1 of this application;

[0046] Figure 2 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 1 of this application;

[0047] Figure 3 This is a distortion curve diagram of the zoom lens at the wide-angle end according to Embodiment 1 of this application;

[0048] Figure 4 This is a distortion curve diagram of the zoom lens at the telephoto end according to Embodiment 1 of this application;

[0049] Figure 5 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 2 of this application;

[0050] Figure 6 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 2 of this application;

[0051] Figure 7 This is a distortion curve diagram of the zoom lens at the wide-angle end according to Embodiment 2 of this application;

[0052] Figure 8This is a distortion curve diagram of the zoom lens at the telephoto end according to Embodiment 2 of this application;

[0053] Figure 9 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 3 of this application;

[0054] Figure 10 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 3 of this application;

[0055] Figure 11 This is a distortion curve diagram of the zoom lens at the wide-angle end according to Embodiment 3 of this application;

[0056] Figure 12 This is a distortion curve diagram of the zoom lens at the telephoto end according to Embodiment 3 of this application;

[0057] Figure 13 This is a schematic diagram of the zoom lens at the wide-angle end according to Embodiment 4 of this application;

[0058] Figure 14 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 4 of this application;

[0059] 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

[0060] 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

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] The features, principles and other aspects of this application are described in detail below.

[0069] In an exemplary embodiment, the zoom lens may include a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group. The first to fifth lens groups may be arranged sequentially along the optical axis from the object side to the image side.

[0070] In an exemplary embodiment, the first lens group may have negative 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.

[0071] In an exemplary embodiment, the second lens group may have positive optical power and may be a zoom group that can move along the optical axis from the image side to the object side, thereby enabling the zoom lens to zoom from the wide-angle end to the telephoto end.

[0072] In an exemplary embodiment, the third lens group may have negative optical power, and the third lens group may be 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.

[0073] In an exemplary embodiment, the fourth lens group may have positive optical power and may be a zoom group that can move along the optical axis from the image side to the object side, together with the second lens group to realize the zoom lens from the wide-angle end to the telephoto end.

[0074] In an exemplary embodiment, the fifth lens group may have positive optical power. The fifth lens group may be a fixed group or a zoom group. When the fifth lens group is a fixed group, its position relative to the image plane is fixed, which is beneficial for correcting off-axis aberrations and distortions. When the fifth lens group is a zoom group, it can work with the second and fourth lens groups to realize the zoom lens from the wide-angle end to the telephoto end.

[0075] A zoom lens according to an exemplary embodiment of this application includes a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group arranged sequentially along the optical axis from the object side to the image side. The first lens group is a focusing group with negative optical power; the second lens group is a zoom group with positive optical power; the third lens group is a fixed group with negative optical power; the fourth lens group is a zoom group with positive optical power; and the fifth lens group is either a fixed group or a zoom group with positive optical power. This arrangement of the zoom lens allows it to achieve at least one of the following beneficial effects: wide-angle, low distortion, large sensor size, miniaturization, and high image quality.

[0076] In an exemplary embodiment, the first lens group may include a first lens, a second lens, and a third lens arranged sequentially along the optical axis from the object side to the image side. The first lens may have negative optical power; the second lens may have negative optical power; and the third lens may have positive optical power.

[0077] In an exemplary embodiment, the object-side surface of the first lens can be convex, and the image-side surface can be concave. The object-side surface of the second lens can be concave, 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 convex.

[0078] In an exemplary embodiment, the first lens group includes two negative lenses and one positive lens. The first lens is a negative convex-concave lens, and the second lens is a negative concave-concave lens, which is beneficial for collecting a large field of view light into the optical system, enabling the zoom lens to have a large field of view at the wide-angle end, for example, FOV_w ≥ 100°. At the same time, the lens configuration of the first lens with a convex object side and a concave image side also helps to reduce distortion.

[0079] In an exemplary embodiment, the second lens group may include a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side. The sixth lens may have positive optical power.

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

[0081] In an exemplary embodiment, the second lens group includes a cemented doublet lens and a positive lens. By including a cemented doublet lens, it is beneficial to balance the positional chromatic aberration of the second lens group and reduce the tolerance sensitivity of the second lens group.

[0082] In an exemplary embodiment, the third lens group may include a seventh lens and an eighth lens arranged sequentially along the optical axis from the object side to the image side.

[0083] In an exemplary embodiment, the seventh lens and the eighth lens can be cemented together to form a cemented doublet lens.

[0084] In an exemplary embodiment, the third lens group includes a cemented lens. The cemented lens, employing a combination of positive and negative lenses, facilitates mutual compensation of positive and negative spherical aberrations, thereby improving the system's resolution.

[0085] In an exemplary embodiment, the fourth lens group may include a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, and a fourteenth lens arranged sequentially along the optical axis from the object side to the image side. The ninth lens may have positive optical power.

[0086] In an exemplary embodiment, the tenth, eleventh, and twelfth lenses can be cemented together to form a cemented triplet lens. The thirteenth and fourteenth lenses can be cemented together to form a cemented doublet lens.

[0087] In an exemplary embodiment, the fourth lens group includes one positive lens and two cemented lenses. The two cemented lenses include one cemented triplet lens and one cemented doublet lens. The inclusion of a cemented triplet lens helps to balance the astigmatism and distortion introduced by the ninth lens; the inclusion of a cemented doublet lens helps to balance the astigmatism introduced by the preceding lens, and the aspherical nature of the last surface of the cemented doublet lens helps to compensate for the positive distortion introduced by the object side of the cemented doublet lens, while also helping to balance various aberrations of the optical system.

[0088] In an exemplary embodiment, the fifth lens group may include a fifteenth lens and a sixteenth lens arranged sequentially along the optical axis from the object side to the image side. The fifteenth lens may have positive optical power; the sixteenth lens may have negative optical power.

[0089] In an exemplary embodiment, 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, and the image-side surface can be concave.

[0090] In an exemplary embodiment, the fifteenth lens and the sixteenth lens can be cemented together to form a cemented doublet lens.

[0091] In an exemplary embodiment, the fifth lens group includes a cemented doublet lens. L15 is a positive convex-convex lens, and L16 is a negative concave-concave lens. When light emerges from the fourth lens group and enters the fifth lens group, it is deflected by the cemented doublet lens, which reduces the CRA while still meeting the requirements for a large target surface.

[0092] In an exemplary embodiment, the first lens group may include a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis from the object side to the image side. The first lens may have negative optical power; the second lens may also have negative optical power.

[0093] In an exemplary embodiment, the object-side surface of the first lens can be convex, and the image-side surface can be concave. The object-side surface of the second lens can be convex, and the image-side surface can be concave.

[0094] In an exemplary embodiment, the third lens and the fourth lens can be cemented together to form a cemented doublet lens.

[0095] In an exemplary embodiment, the first lens group includes two negative lenses and one cemented lens. The first lens is a negative convex-concave lens, and the second lens is also a negative convex-concave lens, which 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 ≥ 100°. The first and second lenses are configured with convex object-side surfaces and concave image-side surfaces, which helps reduce distortion; simultaneously, the inclusion of a cemented lens further helps reduce chromatic aberration and lowers the tolerance sensitivity of the first lens group.

[0096] In an exemplary embodiment, the second lens group may include a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis from the object side to the image side. The eighth lens may have positive optical power.

[0097] In an exemplary embodiment, the fifth lens, the sixth lens, and the seventh lens can be cemented together to form a cemented triplet lens.

[0098] In an exemplary embodiment, the second lens group includes a cemented triplet lens and a positive lens. Incorporating a cemented triplet lens can better balance the positional chromatic aberration of the second lens group, reduce the tolerance sensitivity of the second lens group, and correct system aberrations, thereby improving system resolution.

[0099] In an exemplary embodiment, the third lens group may include a ninth lens, a tenth lens, and an eleventh lens arranged sequentially along the optical axis from the object side to the image side. The ninth lens may have negative optical power; the tenth lens may have negative optical power; and the eleventh lens may have positive optical power.

[0100] In an exemplary embodiment, the object-side surface of the ninth lens can be concave, and the image-side surface can be concave. The object-side surface of the tenth lens can be concave, and the image-side surface can be concave. The object-side surface of the eleventh lens can be convex, and the image-side surface can be convex.

[0101] In an exemplary embodiment, the fourth lens group may include a twelfth, thirteenth, fourteenth, fifteenth, and sixteenth lens arranged sequentially along the optical axis from the object side to the image side. The fifth lens group may include a seventeenth lens.

[0102] In an exemplary embodiment, the fourth lens group may include a twelfth, thirteenth, fourteenth, fifteenth, sixteenth, and seventeenth lens arranged sequentially along the optical axis from the object side to the image side. The fifth lens group may include an eighteenth lens.

[0103] In an exemplary embodiment, the fourth lens group comprises at least five lenses. The fourth lens group includes at least two cemented lenses. The lens closest to the object side of the fourth lens group is an aspherical lens, which helps to balance the astigmatism and distortion it generates. The two lenses closest to the image side of the fourth lens group are cemented lenses, causing light rays passing through these cemented lenses to be deflected upwards and emitted into the fifth lens group, which helps to achieve a large target surface while reducing CRA (Cryptographic Aberration).

[0104] In an exemplary embodiment, the fifth lens group includes a positive lens with a convex image side, and the lens is configured as an aspherical lens, which can help balance distortion from the wide-angle end to the telephoto end.

[0105] 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.

[0106] 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).

[0107] In an exemplary embodiment, the zoom lens may include at least one glass aspherical lens. The use of a glass aspherical lens can help correct distortion, chromatic aberration, and other aberrations in the zoom lens, resulting in an absolute distortion value of less than 15% at the wide-angle end and less than 5% at the telephoto end.

[0108] In an exemplary embodiment, the zoom lens adopts a five-group architecture consisting of focusing, zooming, fixed, zooming, and fixed / zooming lenses, along with an aperture stop. The five lens groups have negative, positive, negative, positive, and positive optical powers, respectively. This architecture of the zoom lens can effectively correct field curvature and distortion, ensuring that the absolute value of distortion at the wide-angle end is <15%, while meeting the usage requirements of a large field of view (field of view at the wide-angle end FOV_w ≥ 100°) and a large target surface (the maximum imaging target surface can reach 25.56mm).

[0109] In an exemplary embodiment, the zoom lens according to this application satisfies: -2.8 ≤ FG1 / Fw ≤ -1.8, 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, so that the field of view of the lens at the wide-angle end satisfies FOV_w ≥ 100°.

[0110] In an exemplary embodiment, the zoom lens according to this application satisfies the following condition: 2.8 ≤ FG2 / Fw ≤ 3.5, 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.

[0111] In an exemplary embodiment, the zoom lens according to this application satisfies: -5.1 ≤ FG3 / Fw ≤ -2.7, 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.

[0112] In an exemplary embodiment, the zoom lens according to this application satisfies the following condition: 2.2 ≤ FG4 / Fw ≤ 3.7, 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, the required zoom ratio during zooming can be guaranteed, and the changes in spherical aberration and distortion throughout the zooming process can be reduced to obtain high imaging performance.

[0113] In an exemplary embodiment, the zoom lens according to this application satisfies: 3.9 ≤ FG5 / Fw ≤ 19.0, where FG5 is the effective focal length of the fifth lens group and Fw is the focal length of the zoom lens at the wide-angle end. By controlling the ratio of the effective focal length of the fifth lens group to the focal length of the zoom lens at the wide-angle end within this range, light can be smoothly emitted to the image plane, which helps to reduce CRA, correct distortion, and achieve large target surface imaging.

[0114] In an exemplary embodiment, the zoom lens according to this application satisfies: -0.9 ≤ F12 / FG1 ≤ -0.3, where F12 is the combined focal length of the first lens and the second lens, and FG1 is the effective focal length of the first lens group. By controlling the ratio of the combined focal length of the first lens and the second lens to the effective focal length of the first lens group within this range, it is beneficial to converge large-angle incident light rays into the optical system, effectively expanding the field of view of the optical system, while also balancing the distortion value it introduces.

[0115] In an exemplary embodiment, the zoom lens according to this application satisfies: -1.1 ≤ FG1 / Ft ≤ -0.5, where FG1 is the effective focal length of the first lens group, and Ft is the focal length of the zoom lens at the telephoto 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 telephoto end within this range, the focal length of the first lens group, which serves as the focusing group, can be controlled within a reasonable range, which helps to reduce the moving distance during the focusing process and limits the total optical length of the zoom lens.

[0116] In an exemplary embodiment, the zoom lens according to this application satisfies: 0.8 ≤ Fj / FG2 ≤ 1.8, where Fj is the focal length of a single lens in the second lens group, and FG2 is the effective focal length of the second lens group. By controlling the ratio of the focal length of a single lens in the second lens group to the effective focal length of the second lens group within this range, it is beneficial to balance chromatic aberration and reduce the tolerance sensitivity of the second lens group.

[0117] In an exemplary embodiment, the zoom lens according to this application satisfies: 2.8 ≤ Ft / Fw ≤ 3.1, where Ft is the focal length of the zoom lens at the telephoto end, and Fw is the focal length of the zoom lens at the wide-angle end. By controlling the ratio of the focal length of the zoom lens at the telephoto end to the focal length of the zoom lens at the wide-angle end within this range, it is beneficial to achieve a large zoom ratio by increasing the zoom range from the wide-angle end to the telephoto end.

[0118] In an exemplary embodiment, the zoom lens according to this application satisfies: 3.7 ≤ TTL_t / Ft ≤ 4.6, where TTL_t is the total optical length of the zoom lens at the telephoto end, 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 at the telephoto end to the focal length of the zoom lens at the telephoto end to be within this range, the total optical length of the system can be kept small, which is beneficial for miniaturization.

[0119] In an exemplary embodiment, the zoom lens according to this application satisfies the following conditions: 1.8 ≤ Ndi ≤ 1.95 and 20 ≤ Vdi ≤ 50, where Ndi is the refractive index of each of the at least four lenses included in the first to fifth lens groups, and Vdi is the Abbe number of each of the at least four lenses included in the first to fifth lens groups. By controlling the refractive index and Abbe number of each of the at least four lenses included in the lens to satisfy the conditions 1.8 ≤ Ndi ≤ 1.95 and 20 ≤ Vdi ≤ 50, respectively, and by rationally selecting the lens material, lateral chromatic aberration can be well corrected when correcting distortion.

[0120] In an exemplary embodiment, the zoom lens according to this application satisfies the following condition: 0.2 ≤ Dmax / TTL_w ≤ 0.5, where Dmax is the maximum optical aperture of the zoom lens, and TTL_w is the total optical length of the zoom lens at the wide-angle end. By controlling the ratio of the maximum optical aperture of the zoom lens to the total optical length of the zoom lens at the wide-angle end within this range, and given a certain total optical length of the system, by controlling the maximum optical aperture during system zooming, the maximum optical aperture of the system can be made smaller, which is beneficial for achieving a smaller system size (or miniaturization).

[0121] In an exemplary embodiment, the zoom lens according to this application satisfies the following condition: 0.3 ≤ Fa / Fb ≤ 0.8, where Fa is the combined focal length of the lens groups located before the aperture stop (i.e., on the object side of the aperture stop), and Fb is the combined focal length of the lens groups located after the aperture stop (i.e., on the image side of the aperture stop). By controlling the ratio of the combined focal length of the lens groups before the aperture stop to the combined focal length of the lens groups after the aperture stop within this range, the light path can be smoothed, which is beneficial for balancing various aberrations generated by the optical system and improving image quality.

[0122] In an exemplary embodiment, the zoom lens according to this application satisfies: 0.1 ≤ D1 / TTL_w ≤ 0.3, where D1 is the total optical length of the first lens group, and TTL_w is the total optical length of the zoom lens at the wide-angle end. By controlling the ratio of the total optical length of the first lens group to the total optical length of the zoom lens at the wide-angle end within this range, the system structure can be made compact and the overall length reduced while satisfying performance requirements.

[0123] In an exemplary embodiment, the zoom lens according to this application satisfies: 5.2 ≤ TTL_w / H ≤ 5.9, where TTL_w is the total optical length of the zoom lens at the wide-angle end, and H is the full image height of the zoom lens. By controlling the ratio of the total optical length of the zoom lens at the wide-angle end to the full image height of the zoom lens within this range, and given a certain total system optical length, optimizing the system image height results in a larger system image height value, which is beneficial for achieving a large target surface.

[0124] In an exemplary embodiment, the zoom lens according to this application satisfies the following condition: 0.5 ≤ BFL_w / Fw ≤ 1.3, where BFL_w is the back focal length of the zoom lens at the wide-angle end (the distance from the image side of the lens closest to the image side to the image plane of the lens), and Fw is the focal length of the zoom lens at the wide-angle end. By controlling the ratio of the back focal length to the focal length at the wide-angle end within this range, the overall system length can be limited within a certain range while satisfying system performance requirements.

[0125] In an exemplary embodiment, the zoom lens of this application may further include, as needed, a filter and / or protective glass disposed between the fifth 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.

[0126] The zoom lens according to the embodiments of this application may include five lens groups arranged sequentially from the object side to the image side along the optical axis. By reasonably setting the first to fifth lens groups to have negative, positive, negative, positive, and positive optical powers in sequence, and setting the first lens group as the focusing group, the second and fourth lens groups as zoom groups, the third lens group as the fixed group, and the fifth lens group as either a fixed or zoom group, and by reasonably setting the number of lenses, optical powers, surface shape, refractive index, Abbe number, and other parameters of each lens group, the zoom lens can achieve at least one of the following beneficial effects: wide-angle, low distortion, large image size, miniaturization, and high imaging quality. For example, the absolute value of distortion at the wide-angle end of the lens can be <15%, while simultaneously satisfying a wide-angle field of view (FOV_w) ≥100°, and a maximum image size of 25.56 mm.

[0127] 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 five lens groups are described as an example in the embodiments, the zoom lens is not limited to including these five 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.

[0128] Example 1

[0129] 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 The zoom lens according to Embodiment 1 of this application is described.

[0130] like Figure 1 and Figure 2 As shown, the zoom lens includes, in sequence along the optical axis from the object side to the image side, a first lens group G1, a second lens group G2, an aperture stop STO, a third lens group G3, a fourth lens group G4, and a fifth lens group G5, as well as a filter CG and an image plane (IMA) located at the image side.

[0131] In this embodiment, the first lens group G1 has negative optical power and serves as a focusing group for focusing or compensation. It compensates for the image plane during continuous zooming of the lens, ensuring image quality during continuous zooming of the lens body. It includes a first lens L1, a second lens L2, and a third lens L3 arranged sequentially along the optical axis from the object side to the image side. The first lens L1 has negative optical power, with its object side S1 being convex and its image side S2 being concave; the second lens L2 has negative optical power, with its object side S3 being concave and its image side S4 being concave; and the third lens L3 has positive optical power, with its object side S5 being convex and its image side S6 being convex.

[0132] In this embodiment, the second lens group G2 has positive optical power and is a zoom group. It moves along the optical axis from the image side to the object side to achieve zoom from the wide-angle end to the telephoto end. It includes a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged sequentially from the object side to the image side along the optical axis. The fourth lens L4 has negative optical power, with its object side S7 being convex and its image side S8 being concave. The fifth lens L5 has positive optical power, with its object side S8 being convex and its image side S9 being convex. The sixth lens L6 has positive optical power, with its object side S10 being convex and its image side S11 being concave. Furthermore, the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented doublet lens.

[0133] In this embodiment, the third lens group G3 has negative optical power and is a fixed group with a fixed position relative to the image plane. It includes a seventh lens L7 and an eighth lens L8 arranged sequentially along the optical axis from the object side to the image side. The seventh lens L7 has positive optical power, with its object side S13 being concave and its image side S14 being convex; the eighth lens L8 has negative optical power, with its object side S14 being concave and its image side S15 being concave. Furthermore, the seventh lens L7 and the eighth lens L8 are cemented together to form a cemented doublet lens.

[0134] In this embodiment, the fourth lens group G4 has positive optical power and is a zoom group. It moves along the optical axis from the image side to the object side, and together with the second lens group G2, it enables the lens to zoom from the wide-angle end to the telephoto end. It includes a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, and a fourteenth lens L14 arranged sequentially from the object side to the image side along the optical axis. 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 negative optical power, with its object-side surface S18 being convex and its image-side surface S19 being concave; and the eleventh lens L11 has positive optical power, with its object-side surface S19 being convex and its image-side surface S20 being convex. The twelfth lens L12 has negative optical power, with its object-side surface S20 being concave and its image-side surface S21 being concave; the thirteenth lens L13 has positive optical power, with its object-side surface S22 being convex and its image-side surface S23 being convex; the fourteenth lens L14 has negative optical power, with its object-side surface S23 being concave and its image-side surface S24 being concave; and the tenth lens L10, the eleventh lens L11, and the twelfth lens L12 are cemented together to form a cemented triplet lens; the thirteenth lens L13 and the fourteenth lens L14 are cemented together to form a cemented doublet lens.

[0135] In this embodiment, the fifth lens group G5 has positive optical power and is a zoom group. It moves along the optical axis from the image side to the object side, and together with the second lens group G2 and the fourth lens group G4, it realizes the zoom of the lens from the wide-angle end to the telephoto end. It includes a fifteenth lens L15 and a sixteenth lens L16 arranged sequentially from the object side to the image side along the optical axis. The fifteenth lens L15 has positive optical power, and its object side S25 is convex and its image side S26 is convex. The sixteenth lens L16 has negative optical power, and its object side S26 is concave and its image side S27 is concave. Furthermore, the fifteenth lens L15 and the sixteenth lens L16 are cemented together to form a cemented doublet lens.

[0136] In this embodiment, the aperture stop STO of the zoom lens is disposed between the second lens group G2 and the third lens group G3, and more specifically, between the sixth lens L6 and the seventh lens L7.

[0137] In this embodiment, the filter CG located between the fifth lens group G5 and the image plane has an object-side surface S28 and an image-side surface S29. Light from the object passes sequentially through each surface S1 to S29 and is finally imaged on the image plane S30, where an image sensor chip IMA may be disposed.

[0138] 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.

[0139]

[0140]

[0141] Table 1

[0142] In Embodiment 1, the object-side surface S1 and image-side surface S2 of the first lens L1, the object-side surface S13 of the seventh lens L7, the object-side surface S16 and image-side surface S17 of the ninth lens L9, and the image-side surface S24 of the fourteenth lens L14 are all aspherical surfaces. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0143]

[0144] 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 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the conic coefficient k and higher-order coefficients A4, A6, A8, A14, A15, A16, S17, and S24 that can be used for the aspherical mirrors S1, S2, S13, S16, S17, and S24 in Example 1. 10 A 12A 14 and A 16 .

[0145] Number / Coefficient k A4 A6 A8 A10 A12 A14 A16 S1 3.79 6.75E-06 -2.09E-08 4.26E-11 -6.13E-14 6.34E-17 -3.89E-20 1.18E-23 S2 0.14 3.67E-06 -2.17E-08 7.94E-12 -2.72E-14 1.06E-21 -3.76E-26 -4.95E-28 S13 -7.25 -8.69E-06 9.67E-09 1.60E-12 -9.20E-14 -3.91E-23 -1.20E-27 -1.50E-29 S16 -0.07 -4.60E-06 -9.18E-09 -5.14E-11 -4.65E-14 1.33E-21 8.08E-29 -2.05E-29 S17 22.48 2.42E-07 5.78E-09 -3.15E-11 1.70E-13 -1.06E-21 -9.55E-27 -3.83E-29 S24 0 2.30E-05 5.45E-09 1.18E-10 -9.49E-13 -2.27E-02 -5.22E-27 -2.59E-29

[0146] Table 2

[0147] In Example 1, by changing the positions of the first lens group G1, the second lens group G2, the fourth lens group G4, and the fifth lens group G5 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. The distance D1 corresponding to row S6 in Table 1 can be a variable, representing the air gap between the first lens group G1 and the second lens group G2 on the optical axis when the zoom lens is at the wide-angle and telephoto ends; the distance D2 corresponding to row S11 in Table 1 can also be a variable, representing the air gap between the second lens group G2 and the aperture stop STO on the optical axis when the zoom lens is at the wide-angle and telephoto ends; the distance D3 corresponding to row S15 in Table 1 can also be a variable, representing the air gap between the second lens group G2 and the aperture stop STO when the zoom lens is at the wide-angle and telephoto ends. The air gap on the optical axis between the third lens group G3 and the fourth lens group G4 at the wide-angle and telephoto ends; the distance D4 corresponding to row S24 in Table 1 can also be a variable, D4 ​​can represent the air gap on the optical axis between the fourth lens group G4 and the fifth lens group G5 when the zoom lens is at the wide-angle and telephoto ends; and the distance D5 corresponding to row S27 in Table 1 can also be a variable, D5 can represent the air gap on the optical axis between the fifth lens group G5 and the filter CG when the zoom lens is at the wide-angle and telephoto ends. In this embodiment, the zoom lens achieves zoom by moving the first lens group G1, the second lens group G2, the fourth lens group G4 and the fifth lens group G5. The values ​​(in mm) of the above variables D1, D2, D3, D4 and D5 when the lens is at the wide-angle and telephoto ends are shown in Table 3 below.

[0148] Face number distance Wide-angle end telephoto end S6 D1 37.21 2.16 S11 D2 1.93 20.80 S15 D3 25.52 1.49 S24 D4 1.89 1.92 S27 D5 7.60 31.60

[0149] Table 3

[0150] 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.

[0151] Example 2

[0152] Figure 5This 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 This application describes a zoom lens according to Embodiment 2. For the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted in this embodiment and the following embodiments.

[0153] like Figure 5 and Figure 6 As shown, the zoom lens in this embodiment has a structural arrangement that is basically the same as that of the zoom lens in Embodiment 1. That is, along the optical axis from the object side to the image side, it sequentially includes a first lens group G1, a second lens group G2, an aperture stop STO, a third lens group G3, a fourth lens group G4, a fifth lens group G5, a filter CG, and an image plane located at the image side. Furthermore, the optical power and operation mode of the first lens group G1 to the fifth lens group G5 are the same as those of the zoom lens described in Embodiment 1. The number of lenses, optical power, surface features, and cementing features included in each lens group are also the same as those of the zoom lens described in Embodiment 1, and will not be repeated here.

[0154] Table 4 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.

[0155]

[0156]

[0157] Table 4

[0158] In Embodiment 2, the object-side surface S1 and image-side surface S2 of the first lens L1, the object-side surface S13 of the seventh lens L7, the object-side surface S16 and image-side surface S17 of the ninth lens L9, and the image-side surface S24 of the fourteenth lens L14 are all aspherical surfaces. Table 5 shows the conic coefficient k and higher-order coefficients A4, A6, A8, and A24 that can be used for each aspherical mirror surface S1, S2, S13, S16, S17, and S24 in Embodiment 2. 10 A 12 A 14 and A 16 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0159] Number / Coefficient k A4 A6 A8 A10 A12 A14 A16 S1 4.78 1.41E-05 -4.98E-08 1.07E-10 -1.42E-13 1.03E-16 -2.27E-20 -1.10E-23 S2 0.08 1.32E-05 -4.44E-08 3.37E-11 1.22E-14 1.06E-21 -3.76E-26 -4.95E-28 S13 -9.75 -1.29E-05 2.58E-08 -3.99E-11 -4.95E-14 -3.91E-23 -1.20E-27 -1.50E-29 S16 -0.10 -4.04E-06 -6.72E-09 -6.75E-11 9.89E-15 1.33E-21 8.53E-29 -2.05E-29 S17 34.27 -1.05E-06 1.95E-09 -2.96E-11 1.88E-13 -1.06E-21 -9.55E-27 -3.83E-29 S24 0 2.29E-05 9.96E-09 1.12E-10 -8.13E-13 -2.27E-22 -5.22E-27 -2.58E-29

[0160] Table 5

[0161] In Example 2, by changing the positions of the first lens group G1, the second lens group G2, the fourth lens group G4, and the fifth lens group G5 on the optical axis, the total effective focal length of the zoom lens can change with the distance from the subject, thereby achieving continuous zoom. The distances D1 corresponding to row S6, D2 corresponding to row S11, D3 corresponding to row S15, D4 corresponding to row S24, and D5 corresponding to row S27 in Table 4 have the same meanings as D1 to D5 described in Example 1. In this example, by moving the first lens group G1, the second lens group G2, the fourth lens group G4, and the fifth lens group G5, the zoom lens achieves magnification. The values ​​(in mm) of the variables D1, D2, D3, D4, and D5 when the lens is at the wide-angle end and the telephoto end are shown in Table 6 below.

[0162] Face number distance Wide-angle end telephoto end S6 D1 37.84 2.16 S11 D2 1.91 19.08 S15 D3 24.88 1.55 S24 D4 1.67 1.58 S27 D5 7.48 30.90

[0163] Table 6

[0164] Figure 7 The distortion curve of the zoom lens in Example 2 at the wide-angle end is shown; Figure 8 The 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.

[0165] Example 3

[0166] 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.

[0167] like Figure 9 and Figure 10 As shown, the zoom lens includes, in sequence along the optical axis from the object side to the image side, a first lens group G1, a second lens group G2, an aperture stop STO, a third lens group G3, a fourth lens group G4, and a fifth lens group G5, as well as an image plane (IMA) located at the image side end.

[0168] In this embodiment, the first lens group G1 has negative optical power and is a focusing group used for focusing or compensation. It can compensate for the image plane during continuous zooming of the lens, ensuring the imaging quality of the lens body during continuous zooming. It includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged sequentially along the optical axis from the object side to the image side. The first lens L1 has negative optical power, with its object side S1 being convex and its image side S2 being concave; the second lens L2 has negative optical power, with its object side S3 being convex and its image side S4 being concave; the third lens L3 has negative optical power, with its object side S5 being concave and its image side S6 being concave; the fourth lens L4 has positive optical power, with its object side S6 being convex and its image side S7 being convex; and the third lens L3 and the fourth lens L4 are cemented together to form a cemented doublet lens.

[0169] In this embodiment, the second lens group G2 has positive optical power and is a zoom group. It moves along the optical axis from the image side to the object side to achieve zoom from the wide-angle end to the telephoto end. It includes a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8 arranged sequentially from the object side to the image side along the optical axis. The fifth lens L5 has negative optical power, its object side S8 is convex, and its image side S9 is concave. The sixth lens L6 has positive optical power, its object side S9 is convex, and its image side S10 is convex. The seventh lens L7 has negative optical power, its object side S10 is concave, and its image side S11 is convex. The eighth lens L8 has positive optical power, its object side S12 is convex, and its image side S13 is convex. Furthermore, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are cemented together to form a cemented triplet lens.

[0170] In this embodiment, the third lens group G3 has negative optical power and is a fixed group with a fixed position relative to the image plane. It includes a ninth lens L9, a tenth lens L10, and an eleventh lens L11 arranged sequentially along the optical axis from the object side to the image side. The ninth lens L9 has negative optical power, and its object side S15 is concave, and its image side S16 is concave. The tenth lens L10 has negative optical power, and its object side S17 is concave, and its image side S18 is concave. The eleventh lens L11 has positive optical power, and its object side S19 is convex, and its image side S20 is convex.

[0171] In this embodiment, the fourth lens group G4 has positive optical power and is a zoom group, moving along the optical axis from the image side to the object side, working together with the second lens group G2 to achieve zoom from wide-angle to telephoto. It includes a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, a fifteenth lens L15, a sixteenth lens L16, and a seventeenth lens L17 arranged sequentially along the optical axis from the object side to the image side. The twelfth lens L12 has positive optical power, with its object side S21 being convex and its image side S22 being convex; the thirteenth lens L13 has negative optical power, with its object side S23 being concave and its image side S24 being convex; the fourteenth lens L14 has positive optical power, with its object side S25 being convex and its image side S24 being convex. Surface S26 is convex; the fifteenth lens L15 has negative optical power, its object-side surface S26 is concave, and its image-side surface S27 is concave; the sixteenth lens L16 has positive optical power, its object-side surface S28 is convex, and its image-side surface S29 is convex; the seventeenth lens L17 has negative optical power, its object-side surface S29 is concave, and its image-side surface S30 is concave; furthermore, the fourteenth lens L14 and the fifteenth lens L15 are cemented together to form a cemented doublet; the sixteenth lens L16 and the seventeenth lens L17 are cemented together to form a cemented doublet.

[0172] In this embodiment, the fifth lens group G5 has positive optical power and is a fixed group with a fixed position relative to the image plane. It includes an eighteenth lens L18, which has positive optical power, with its object-side surface S31 being convex and its image-side surface S32 being concave. The fifth lens group G5 also includes a filter CG located on the image side of the eighteenth lens L18, the filter CG having an object-side surface S33 and an image-side surface S34.

[0173] In this embodiment, the aperture stop STO of the zoom lens is disposed between the second lens group G2 and the third lens group G3, and more specifically, between the eighth lens L8 and the ninth lens L9.

[0174] In this embodiment, light from the object passes sequentially through each surface S1 to S34 and is finally imaged on the image plane S35, where an image sensing chip IMA may be disposed.

[0175] 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 3.

[0176]

[0177]

[0178] Table 7

[0179] In Example 3, the object-side surface S3 and image-side surface S4 of the second lens L2, the object-side surface S21 and image-side surface S22 of the twelfth lens L12, the object-side surface S23 and image-side surface S24 of the thirteenth lens L13, and the object-side surface S31 and image-side surface S32 of the eighteenth lens L18 are all aspherical surfaces. Table 8 shows the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror surface S3, S4, S21, S22, S23, S24, S31, and S32 in Example 3. 10 A 12 A 14 and A 16 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0180]

[0181]

[0182] Table 8

[0183] In embodiment 3, by changing the positions of the first lens group G1, the second lens group G2, and the fourth lens group G4 on the optical axis, the total effective focal length of the zoom lens can change with the distance from the subject, thereby achieving continuous zoom of the zoom lens. In Table 7, the distance D1 corresponding to row S7 can be a variable, representing the air gap on the optical axis between the first lens group G1 and the second lens group G2 when the zoom lens is at the wide-angle and telephoto ends; the distance D2 corresponding to row S13 in Table 7 can also be a variable, representing the air gap on the optical axis between the second lens group G2 and the aperture stop STO when the zoom lens is at the wide-angle and telephoto ends; the distance D3 corresponding to row S20 in Table 7 can also be a variable, representing the air gap on the optical axis between the third lens group G3 and the fourth lens group G4 when the zoom lens is at the wide-angle and telephoto ends; and the distance D4 corresponding to row S30 in Table 7 can also be a variable, representing the air gap on the optical axis between the fourth lens group G4 and the fifth lens group G5 when the zoom lens is at the wide-angle and telephoto ends. In this embodiment, the zoom lens achieves zoom by moving the first lens group G1, the second lens group G2, and the fourth lens group G4. The values ​​(in mm) of the above variables D1, D2, D3, and D4 when the lens is at the wide-angle end and the telephoto end are respectively shown in Table 9 below.

[0184] Face number distance Wide-angle end telephoto end S7 D1 33.81 0.47 S13 D2 1.80 32.38 S20 D3 12.26 1.37 S30 D4 6.63 17.52

[0185] Table 9

[0186] 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.

[0187] Example 4

[0188] 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.

[0189] like Figure 13 and Figure 14 As shown, the zoom lens in this embodiment has a structural configuration that is basically the same as that of the zoom lens in Embodiment 3. That is, along the optical axis from the object side to the image side, it sequentially includes a first lens group G1, a second lens group G2, an aperture stop STO, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and an image plane (IMA) located at the image side. Furthermore, the optical power and operation mode of the first lens group G1 to the fifth lens group G5 are the same as those of the zoom lens described in Embodiment 3. 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 eighteenth lens L18 included in the fifth lens group G5 has different surface features than the eighteenth lens L18 in Embodiment 3. Therefore, for the sake of brevity, the description of parts similar to those in Embodiment 3 is omitted in this embodiment, and only the differences between the two are explained as follows:

[0190] In this embodiment, the object-side surface S31 of the eighteenth lens L18 is convex, and the image-side surface S32 is convex.

[0191] Table 10 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.

[0192]

[0193]

[0194] Table 10

[0195] In Example 4, the object-side surface S3 and image-side surface S4 of the second lens L2, the object-side surface S21 and image-side surface S22 of the twelfth lens L12, the object-side surface S23 and image-side surface S24 of the thirteenth lens L13, and the object-side surface S31 and image-side surface S32 of the eighteenth lens L18 are all aspherical surfaces. Table 11 shows the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror surface S3, S4, S21, S22, S23, S24, S31, and S32 in Example 4. 10 A 12 A 14 and A 16 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0196] Number / Coefficient k A4 A6 A8 A10 A12 A14 A16 S3 -0.62 -3.30E-05 2.82E-08 1.34E-10 -6.61E-13 9.86E-16 4.14E-20 -1.24E-21 S4 -2.45 9.99E-06 -1.33E-07 8.87E-10 -4.06E-12 1.12E-14 -1.75E-17 1.15E-20 S21 0.76 -5.42E-06 -1.33E-07 5.90E-10 -1.22E-11 -6.96E-14 -7.09E-18 -1.12E-18 S22 -3.68 3.70E-05 -3.18E-07 2.03E-09 -5.55E-12 1.19E-13 -4.60E-16 -4.36E-18 S23 -0.38 1.02E-04 -1.41E-07 -1.29E-09 3.28E-11 2.72E-13 -2.27E-15 1.28E-23 S24 -4.00 4.96E-05 1.71E-07 -2.09E-09 1.77E-11 1.94E-13 -1.93E-15 -4.58E-23 S31 -69.01 7.24E-05 1.39E-07 -7.20E-09 7.70E-11 -3.75E-13 8.50E-16 -8.48E-19 S32 -2.60 7.41E-05 8.52E-08 -3.79E-09 3.45E-12 3.19E-13 -2.27E-15 4.50E-18

[0197] Table 11

[0198] In Example 4, by changing the positions of the first lens group G1, the second lens group G2, and the fourth lens group G4 on the optical axis, the total effective focal length of the zoom lens can change with the distance from the subject, thereby achieving continuous zoom. The distances D1 corresponding to row S7, D2 corresponding to row S13, D3 corresponding to row S20, and D4 corresponding to row S30 in Table 10 have the same meaning as D1 to D4 described in Example 3. In this example, by moving the first lens group G1, the second lens group G2, and the fourth lens group G4, the zoom lens achieves magnification. The values ​​(in mm) of the variables D1, D2, D3, and D4 when the lens is at the wide-angle end and the telephoto end are shown in Table 12 below.

[0199] Face number distance Wide-angle end telephoto end S7 D1 33.46 0.47 S13 D2 1.81 31.91 S20 D3 11.93 1.32 S30 D4 7.30 17.91

[0200] Table 12

[0201] 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.

[0202] In Examples 1 to 4, the effective focal length f(Fw-Ft), aperture number FNO(wt), distortion (wt), and field of view (FOV) of the zoom lens at the wide-angle and telephoto ends are respectively shown in Table 13.

[0203] Example / Parameters f(Fw-Ft) FNO(wt) Distortion (wt) FOV(wt) 1 12.54-37.04 (mm) 2.0-3.0 15％、0.5％ 100°-38° 2 12.23-36.12 (mm) 2.0-3.0 12％、1％ 100°-39° 3 12.19-35.93 (mm) 2.0-3.0 12％、5％ 100°-38° 4 12.15-35.81 (mm) 2.0-3.0 12％、5％ 100°-38°

[0204] Table 13

[0205] Examples 1 to 4 satisfy the relationships shown in Table 14 below.

[0206] Conditional Implementation Examples Example 1 Example 2 Example 3 Example 4 FG1 / Fw -1.915 -1.932 -2.670 -2.664 FG2 / Fw 3.065 3.020 3.304 3.290 FG3 / Fw -4.931 -4.675 -3.676 -3.500 FG4 / Fw 3.562 3.573 2.531 2.450 FG5 / Fw 17.994 18.832 4.410 4.041 F12 / FG1 -0.474 -0.490 -0.764 -0.744 FG1 / Ft -0.648 -0.657 -0.906 -0.904 Fj / FG2 1.742 1.704 0.915 0.916 Ft / Fw 2.955 2.942 2.947 2.946 TTL_t / Ft 4.406 4.518 3.890 3.822 Dmax / TTL_w 0.349 0.361 0.382 0.376 Fa / Fb 0.393 0.559 0.591 0.613 D1 / TTL_w 0.193 0.199 0.198 0.193 TTL_w / H 5.752 5.661 5.360 5.467 BFL_w / Fw 1.148 1.163 0.661 0.626

[0207] Table 14

[0208] 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.

[0209] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A zoom lens, characterized in that, Along the optical axis from the object side to the image side, the lens group consists of a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group, in sequence. The first lens group is a focusing group with negative optical power; The second lens group is a zoom group with positive optical power; The third lens group is a fixed group with negative optical power; The fourth lens group is a zoom group with positive optical power; and The fifth lens group is a fixed group or a zoom group with positive optical power; The zoom lens contains five lens groups 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: -5.1≤FG3 / Fw≤-2.7; The focal length Ft of the zoom lens at the telephoto end and the focal length Fw of the zoom lens at the wide-angle end satisfy: 2.8≤Ft / Fw≤3.

1.

2. The zoom lens according to claim 1, characterized in that, The first lens group includes a first lens, a second lens, and a third lens arranged sequentially along the optical axis from the object side to the image side, wherein, The first lens has negative optical power; The second lens has negative optical power; and The third lens has positive optical power.

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

4. The zoom lens according to claim 1, characterized in that, The second lens group includes a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side, wherein, The sixth lens has positive optical power.

5. The zoom lens according to claim 4, characterized in that, The fourth lens and the fifth lens are cemented together to form a cemented doublet lens.

6. The zoom lens according to claim 1, characterized in that, The third lens group includes a seventh lens and an eighth lens arranged sequentially from the object side to the image side along the optical axis.

7. The zoom lens according to claim 6, characterized in that, The seventh lens and the eighth lens are cemented together to form a cemented doublet lens.

8. The zoom lens according to claim 1, characterized in that, The fourth lens group includes a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, and a fourteenth lens arranged sequentially along the optical axis from the object side to the image side, wherein... The ninth lens has positive optical power.

9. The zoom lens according to claim 8, characterized in that, The tenth lens, the eleventh lens, and the twelfth lens are cemented together to form a cemented triplet lens; and The thirteenth lens and the fourteenth lens are cemented together to form a cemented doublet lens.

10. The zoom lens according to claim 1, characterized in that, The fifth lens group includes a fifteenth lens and a sixteenth lens arranged sequentially along the optical axis from the object side to the image side, wherein... The fifteenth lens has positive optical power; and The sixteenth lens has negative optical power.

11. The zoom lens according to claim 10, characterized in that, The object-side surface of the fifteenth lens is convex, and the image-side surface is also convex; and The object side and image side of the sixteenth lens are both concave.

12. The zoom lens according to claim 10, characterized in that, The fifteenth lens and the sixteenth lens are cemented together to form a cemented doublet lens.

13. The zoom lens according to claim 1, characterized in that, The first lens group includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis from the object side to the image side, wherein, The first lens has negative optical power; and The second lens has negative optical power.

14. The zoom lens according to claim 13, characterized in that, The object-side surface of the first lens is convex, and the image-side surface is concave; and The object-side surface of the second lens is convex, and the image-side surface is concave.

15. The zoom lens according to claim 13, characterized in that, The third lens and the fourth lens are cemented together to form a cemented doublet lens.

16. The zoom lens according to claim 1, characterized in that, The second lens group includes a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis from the object side to the image side, wherein, The eighth lens has positive optical power.

17. The zoom lens according to claim 16, characterized in that, The fifth lens, the sixth lens, and the seventh lens are cemented together to form a cemented triplet lens.

18. The zoom lens according to claim 1, characterized in that, The third lens group includes a ninth lens, a tenth lens, and an eleventh lens arranged sequentially along the optical axis from the object side to the image side, wherein... The ninth lens has negative optical power; The tenth lens has negative optical power; and The eleventh lens has positive optical power.

19. The zoom lens according to claim 18, characterized in that, The object-side surface of the ninth lens is concave, and the image-side surface is also concave. The object-side surface of the tenth lens is concave, and the image-side surface is also concave; and The object-side surface of the eleventh lens is convex, and the image-side surface is also convex.

20. The zoom lens according to claim 1, characterized in that, The fourth lens group includes the twelfth, thirteenth, fourteenth, fifteenth, and sixteenth lenses arranged sequentially from the object side to the image side along the optical axis.

21. The zoom lens according to claim 1, characterized in that, The fourth lens group includes the twelfth, thirteenth, fourteenth, fifteenth, sixteenth, and seventeenth lenses arranged sequentially along the optical axis from the object side to the image side.

22. The zoom lens according to claim 1, characterized in that, The fifth lens group includes either the seventeenth or eighteenth lens.

23. The zoom lens according to any one of claims 1 to 22, 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: -2.8≤FG1 / Fw≤-1.

8.

24. The zoom lens according to any one of claims 1 to 22, characterized in that, The effective focal length FG2 of the second lens group and the focal length Fw of the zoom lens at the wide-angle end satisfy: 2.8≤FG2 / Fw≤3.

5.

25. The zoom lens according to any one of claims 1 to 22, 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: 2.2≤FG4 / Fw≤3.

7.

26. The zoom lens according to any one of claims 1 to 22, characterized in that, The effective focal length FG5 of the fifth lens group and the focal length Fw of the zoom lens at the wide-angle end satisfy: 3.9≤FG5 / Fw≤19.

0.

27. The zoom lens according to claim 2 or 13, characterized in that, The combined focal length F12 of the first lens and the second lens and the effective focal length FG1 of the first lens group satisfy: -0.9≤F12 / FG1≤-0.

3.

28. The zoom lens according to any one of claims 1 to 22, characterized in that, The effective focal length FG1 of the first lens group and the focal length Ft of the zoom lens at the telephoto end satisfy: -1.1≤FG1 / Ft≤-0.

5.

29. The zoom lens according to any one of claims 1 to 22, characterized in that, The focal length Fj of a single lens in the second lens group and the effective focal length FG2 of the second lens group satisfy: 0.8≤Fj / FG2≤1.

8.

30. The zoom lens according to any one of claims 1 to 22, characterized in that, The total optical length TTL_t of the zoom lens at the telephoto end and the focal length Ft of the zoom lens at the telephoto end satisfy: 3.7≤TTL_t / Ft≤4.

6.

31. The zoom lens according to any one of claims 1 to 22, characterized in that, The refractive index Ndi of at least four lenses included in the first to fifth lens groups satisfies: 1.8 ≤ Ndi ≤ 1.95; and The Abbe number Vdi of at least four lenses included in the first to fifth lens groups satisfies: 20 ≤ Vdi ≤ 50.

32. The zoom lens according to any one of claims 1 to 22, characterized in that, The maximum optical aperture Dmax of the zoom lens and the total optical length TTL_w of the zoom lens at the wide-angle end satisfy: 0.2≤Dmax / TTL_w≤0.

5.

33. The zoom lens according to any one of claims 1 to 22, characterized in that, The zoom lens includes an aperture stop, and the combined focal length Fa of the lens group located before the aperture stop and the combined focal length Fb of the lens group located after the aperture stop satisfy: 0.3≤Fa / Fb≤0.

8.

34. The zoom lens according to any one of claims 1 to 22, characterized in that, The total optical length D1 of the first lens group and the total optical length TTL_w of the zoom lens at the wide-angle end satisfy: 0.1≤D1 / TTL_w≤0.

3.

35. The zoom lens according to any one of claims 1 to 22, characterized in that, The total optical length TTL_w of the zoom lens at the wide-angle end and the holographic height H of the zoom lens satisfy the following condition: 5.2≤TTL_w / H≤5.

9.

36. The zoom lens according to any one of claims 1 to 22, characterized in that, The back focal length BFL_w of the zoom lens at the wide-angle end and the focal length Fw of the zoom lens at the wide-angle end satisfy: 0.5≤BFL_w / Fw≤1.3.

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