Zoom lens, camera module and electronic device

Abstract

The application provides a zoom lens, a camera module and an electronic device. The zoom lens comprises a first lens group, a second lens group and a third lens group arranged in sequence along an optical axis from an object side to an image side. The zoom lens has a wide-angle end and a telephoto end. The second lens group and the third lens group are movable along the optical axis, so that the zoom lens is switched between the wide-angle end and the telephoto end to realize continuous zooming. The zoom lens satisfies the following relationship: TTL / fzt<1.0, wherein TTL is the total optical length of the zoom lens, and fzt is the focal length of the telephoto end. The zoom lens provided by the application can ensure good imaging quality during zooming.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, specifically to a zoom lens, a camera module, and an electronic device. Background Technology

[0002] In recent years, with the rapid development of smartphones, consumers have increasingly higher demands for mobile phone photography performance. For example, wider zoom range, higher resolution, and higher image quality are required. These demands place higher requirements on mobile phone lenses, and single-focal-length lenses and digital zoom methods can no longer meet consumer needs. Currently, most high-magnification optical zoom lenses on the market are "skip-type" zooms, which achieve hybrid optical zoom by using two or three lenses with different focal lengths, combined with algorithm-based digital zoom. However, skip-type digital zoom relies on multiple cameras with different focal lengths to achieve continuous zoom through algorithm processing, and is not actually continuous zoom. Its disadvantage is that during the zoom process, the image sharpness of the disconnected parts outside the focal length range of the multiple cameras is reduced compared to continuous optical zoom, affecting image quality. Summary of the Invention

[0003] This application provides a zoom lens, camera module, and electronic device that can ensure good image quality during zooming.

[0004] In a first aspect, this application provides a zoom lens comprising: a first lens group, a second lens group, and a third lens group arranged sequentially along the optical axis from the object side to the image side. The zoom lens has a wide-angle end and a telephoto end. The second lens group and the third lens group are movable along the optical axis to allow the zoom lens to switch between the wide-angle end and the telephoto end to achieve continuous zoom. The zoom lens satisfies the following relationship: TTL / fzt < 1.0; where TTL is the total optical length of the zoom lens, and fzt is the focal length of the telephoto end.

[0005] Secondly, this application also provides a camera module, which includes a photosensitive element and the aforementioned zoom lens, wherein the photosensitive element is used to receive light from the zoom lens.

[0006] Thirdly, this application also provides an electronic device, which includes a device body and the aforementioned camera module, wherein the camera module is mounted on the device body.

[0007] In the zoom lens provided in this embodiment, since both the first lens group and the second lens group can move along the optical axis, the zoom switching between the telephoto and wide-angle ends can be achieved by moving the first and second lens groups. Compared with related technologies, the zoom lens provided in this embodiment is equivalent to integrating multiple lenses with different focal lengths. During the switching between the telephoto and wide-angle ends, the zoom lens always provides continuous optical zoom, thus ensuring that the zoom lens maintains good image quality without any degradation. Furthermore, integrating the lenses reduces the overall size of the camera module, lowers costs, and allows for the use of larger image sensors, thereby improving image quality (e.g., achieving high-pixel shooting and reducing signal-to-noise ratio). In addition, since the zoom lens satisfies the relationship TTL / fzt < 1.0, the overall length of the zoom lens is shorter, allowing for miniaturization. Miniaturized zoom lenses are more suitable for electronic devices with thinner and lighter requirements, such as mobile phones. In summary, the zoom lens provided in this application can achieve continuous optical zoom to improve image quality. Moreover, this zoom lens has a compact structure and small size, which can meet the thickness requirements of smartphones. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the implementation will be briefly introduced below. Obviously, the drawings described below are some implementations of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of an electronic device in one state according to an embodiment of this application.

[0010] Figure 2 for Figure 1 A schematic diagram of the electronic device in another state.

[0011] Figure 3 This is a schematic diagram of a camera module provided in an embodiment of this application.

[0012] Figure 4 This is a schematic diagram of the zoom lens provided in Embodiment 1 of this application at the wide-angle end and the telephoto end.

[0013] Figure 5 This is an image of astigmatism when the zoom lens is at the wide-angle end in Example 1.

[0014] Figure 6 This is a spherical aberration diagram of the zoom lens at the wide-angle end in Example 1.

[0015] Figure 7 This is a distortion diagram of the zoom lens at the wide-angle end in Example 1.

[0016] Figure 8 This is the transverse chromatic aberration diagram based on 555nm when the zoom lens is at the wide-angle end in Example 1.

[0017] Figure 9 This is an image of astigmatism when the zoom lens is at the telephoto end in Example 1.

[0018] Figure 10 This is a spherical aberration diagram when the zoom lens is at the telephoto end in Example 1.

[0019] Figure 11 This is a distortion diagram of the zoom lens at the telephoto end in Example 1.

[0020] Figure 12 This is the 555nm reference chromatic aberration diagram of the zoom lens at the telephoto end in Example 1.

[0021] Figure 13 This is a schematic diagram of the zoom lens provided in Embodiment 2 of this application at the wide-angle end and the telephoto end.

[0022] Figure 14 This is an image of astigmatism when the zoom lens is at the wide-angle end in Example 2.

[0023] Figure 15 This is a spherical aberration diagram when the zoom lens is at the wide-angle end in Example 2.

[0024] Figure 16 This is a distortion diagram of the zoom lens at the wide-angle end in Example 2.

[0025] Figure 17 This is the transverse chromatic aberration diagram based on 555nm when the zoom lens is at the wide-angle end in Example 2.

[0026] Figure 18 This is an image of astigmatism when the zoom lens is at the telephoto end in Example 2.

[0027] Figure 19 This is a spherical aberration diagram when the zoom lens is at the telephoto end in Example 2.

[0028] Figure 20 This is a distortion diagram of the zoom lens at the telephoto end in Example 2.

[0029] Figure 21 This is the 555nm reference chromatic aberration diagram of the zoom lens at the telephoto end in Example 2.

[0030] Figure 22 This is a schematic diagram of the zoom lens provided in Embodiment 3 of this application at the wide-angle end and the telephoto end.

[0031] Figure 23This is an image of astigmatism when the zoom lens is at the wide-angle end in Example 3.

[0032] Figure 24 This is a spherical aberration diagram of the zoom lens at the wide-angle end in Example 3.

[0033] Figure 25 This is a distortion diagram of the zoom lens at the wide-angle end in Example 3.

[0034] Figure 26 This is the transverse chromatic aberration diagram based on 555nm when the zoom lens is at the wide-angle end in Example 3.

[0035] Figure 27 This is an image of astigmatism when the zoom lens is at the telephoto end in Example 3.

[0036] Figure 28 This is a spherical aberration diagram when the zoom lens is at the telephoto end in Example 3.

[0037] Figure 29 This is a distortion diagram of the zoom lens at the telephoto end in Example 3.

[0038] Figure 30 This is the 555nm reference chromatic aberration diagram of the zoom lens at the telephoto end in Example 3. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0040] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0041] Please refer to Figure 1 and Figure 2 This application provides an electronic device 100, which includes a device body 1 and a camera module 2, wherein the camera module 2 is installed on the device body 1.

[0042] The device body 1 has a light-transmitting window K14, and the camera module 2 is disposed inside the device body 1 corresponding to the light-transmitting window K14. External light can enter the camera module 2 through the light-transmitting window K14. The shape of the light-transmitting window K14 can be, but is not limited to, circular, elliptical, triangular, rectangular, etc. The light-transmitting window K14 can refer to a through hole on the device body 1, or it can be a light-transmitting solid part on the device body 1.

[0043] The electronic device 100 can be a mobile phone, tablet computer, laptop computer, wearable device (such as a smartwatch, VR device, etc.), television, e-reader, etc. The following description uses a mobile phone as an example only.

[0044] The device body 1 refers to the main body of the electronic device 100, which includes electronic components that realize the main functions of the electronic device 100 and a housing that protects and supports these electronic components. The device body 1 may include a display screen 11, a mid-frame 12, and a back cover 13 (e.g., ...). Figure 2 As shown, the display screen 11 and the back cover 13 are both connected to the middle frame 12 and are located on opposite sides of the middle frame 12, and the side of the middle frame 12 is exposed outside the back cover 13 and the display screen 11.

[0045] It should be noted that, depending on actual needs, the camera module 2 can be located on any side of the electronic device 100, and this application does not limit this. Taking a mobile phone as an example, the camera module 2 can be located on the front, back, or side of the phone. Here, the front refers to the side of the phone with the display screen 11; the back refers to the side of the phone with the back cover 13; and the side refers to the circumferential side of the phone's frame 12. It is understood that the definitions of "front," "back," and "side" may differ depending on the type of electronic device 100; other types of electronic devices 100 will not be detailed here.

[0046] Camera module 2 can be a periscope camera, with its thickness matching that of electronic device 100, which allows for a thinner design of electronic device 100. The periscope camera's length can match the length or width of electronic device 100, or it can be angled within electronic device 100. Of course, in other embodiments, camera module 2 can also be other types of cameras besides periscope cameras.

[0047] Please refer to Figure 3 This application provides a camera module 2, which includes a photosensitive element 23 and a zoom lens 21. The photosensitive element 23 is used to receive light from the zoom lens 21.

[0048] Specifically, the zoom lens 21 is used to collect light from the subject and focus it onto the photosensitive element 23, which then converts the light signal into an electrical signal. The zoom lens 21 comprises multiple lenses, the number of which can be, but is not limited to, 6, 7, or 8 lenses. The lens material can be, but is not limited to, transparent glass or transparent plastic. The photosensitive element 23 can also be called a photosensitive chip, image sensor, or sensor. The photosensitive element 23 can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device. The photosensitive element 23 has an imaging surface S231, which is the target surface on the photosensitive element 23 that receives light.

[0049] The camera module 2 also includes a light filter 22, which is disposed in the light propagation path between the zoom lens 21 and the photosensitive element 23. The light filter 22 is used to eliminate unwanted light to improve effective resolution and color reproduction. The light filter 22 may be, but is not limited to, an infrared light filter 22.

[0050] Optionally, camera module 2 is a periscope camera: camera module 2 also includes a reflector 24, which is disposed on the object side of zoom lens 21 and is used to change the light path to reflect external light to zoom lens 21. The reflector 24 can be a prism or a plane mirror.

[0051] It should be noted that the imaging surface S231 and filter 22 mentioned in the following embodiments of zoom lens 21 are used to assist in describing zoom lens 21, and do not mean that zoom lens 21 includes photosensitive element 23 with imaging surface S231 and filter 22.

[0052] The zoom lens 21 in the above-mentioned camera module 2 is described in detail below with reference to the accompanying drawings.

[0053] Please refer to Figure 3 and Figure 4 This application also provides a zoom lens 21, which includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the image side.

[0054] The first lens group G1 has negative optical power. The second lens group G2 has positive optical power and includes at least one lens with negative optical power. The third lens group G3 has negative optical power and includes at least one lens with negative optical power. Optical power characterizes the ability of an optical system (lens or lens group) to deflect light rays. Generally, optical power is also the reciprocal of the image-side focal length. A positive optical power indicates that the optical system converges light rays. A negative optical power indicates that the optical system diverges light rays.

[0055] The first lens group G1 includes at least two lenses. The second lens group G2 includes at least three lenses. The third lens group G3 includes at least two lenses. The total number N of lenses in the zoom lens 21 satisfies: N≤9, and the total number of lenses N can be 7, 8, or 9.

[0056] The more lenses in a zoom lens, the better the imaging effect of the zoom lens 21. The fewer lenses in a zoom lens, the lower the cost and the smaller the overall optical length. When the total number of lenses N is greater than 9, the overall optical length of the zoom lens 21 is too large, making it unsuitable for use in electronic devices 100 with requirements for thinness and lightness. This embodiment balances imaging quality and overall optical length by selecting a total number of lenses of less than or equal to 9, thereby ensuring that the zoom lens 21 has good imaging performance while also achieving the beneficial effects of miniaturization and light weight.

[0057] Each lens in the zoom lens 21 can be made of glass or plastic. Optionally, at least one lens in the zoom lens 21 is made of plastic. Compared to glass, plastic is lighter and more suitable for electronic devices 100 that require a slim and lightweight design.

[0058] Optional, please refer to Figure 4 The first lens group G1 includes a first lens L1 and a second lens L2. The second lens group G2 includes a third lens L3, a fourth lens L4, and a fifth lens L5. The third lens group G3 includes a sixth lens L6 and a seventh lens L7. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are arranged sequentially along the optical axis X from the object side to the image side.

[0059] Please refer to Figure 4The first lens group G1 is a fixed lens group, while the second lens group G2 and the third lens group G3 are movable lens groups. The zoom lens 21 has a wide-angle end and a telephoto end. The second lens group G2 and the third lens group G3 can move along the optical axis X to allow the zoom lens 21 to switch between the wide-angle end and the telephoto end, achieving continuous zoom. Therefore, the second lens group G2 and the third lens group G3 can also be referred to as zoom lens groups. The wide-angle end and the telephoto end represent two different shooting states of the zoom lens 21. The wide-angle end can also be called the short focal length state, and the telephoto end can also be called the long focal length state. These two states of the zoom lens 21 are achieved by changing the positions of the second lens group G2 and the third lens group G3; that is, the positions of the second lens group G2 and the third lens group G3 when the zoom lens 21 is at the wide-angle end are different from the positions of the second lens group G2 and the third lens group G3 when the zoom lens 21 is at the telephoto end. The telephoto end refers to the state when the focal length of the zoom lens 21 is at its maximum; the telephoto end can also be called the telephoto state. The wide-angle end refers to the state when the focal length of the zoom lens 21 is at its minimum; the wide-angle end can also be called the wide-angle state.

[0060] In the zoom lens 21 provided in this embodiment, since both the second lens group G2 and the third lens group G3 can move along the optical axis X, the zoom switching between the telephoto and wide-angle ends can be achieved by moving the second lens group G2 and the third lens group G3. Compared with related technologies, the zoom lens 21 provided in this embodiment is equivalent to integrating multiple lenses with different focal lengths. During the switching process between the telephoto and wide-angle ends, the zoom lens 21 always provides continuous optical zoom, thus ensuring that the zoom lens 21 always produces high-quality images without any quality degradation. Furthermore, integrating the lenses can reduce the overall size of the camera module 2, lower costs, and allow for the use of a large-sensor image sensor 23, thereby improving image quality (e.g., achieving high-pixel shooting and reducing the signal-to-noise ratio).

[0061] Furthermore, the zoom lens 21 satisfies the following relationship: TTL / fzt < 1.0; where TTL is the total optical length of the zoom lens 21, and fzt is the focal length of the telephoto end. It should be noted that the total optical length refers to the optical distance from the surface of the first lens group G1 closest to the object side to the imaging plane S231. For a description of the total optical length in the following sections, please refer to this section.

[0062] The TTL / fzt (the ratio of TTL to fzt) can be, but is not limited to, 0.99, 0.98, 0.95, 0.94, 0.93, 0.91, 0.90, 0.892, 0.89, 0.88, 0.87, 0.867, 0.85, 0.83, 0.82, 0.81, 0.809, 0.80, etc.

[0063] In this embodiment, since the zoom lens 21 satisfies the above relationship, the overall length of the zoom lens 21 is shorter, so that it can be miniaturized. The miniaturized zoom lens 21 is more suitable for electronic devices 100 with requirements for thinness and lightness, such as mobile phones.

[0064] Please refer to Figure 4 , during the zooming process of the zoom lens 21 from the wide-angle end to the telephoto end, the second lens group G2 moves toward the object side along the optical axis X, and the third lens group G3 moves toward the object side along the optical axis X. Correspondingly, during the zooming process of the zoom lens 21 from the telephoto end to the wide-angle end, the second lens group G2 moves toward the image side along the optical axis X, and the third lens group G3 moves toward the image side along the optical axis X.

[0065] Please refer to Figure 4 , the zoom lens 21 satisfies the following relationship: TTL / ImgH < 5, where ImgH is the image height, and the image height refers to half of the diagonal length of the effective pixel region of the imaging surface S231.

[0066] Among them, the ratio of TTL / ImgH (the ratio of TTL to ImgH) can be but is not limited to 4.9, 4.6, 4.3, 3.9, 3.8, 3.7, 3.6, 3.5, 3.3, 3.2, 3.1, 3.0, 2.9, 2.8, 2.7, 2.6, 2.4, 2.3, 2.2, 2.1, etc.

[0067] In this embodiment, since the zoom lens 21 satisfies the above relationship, the overall length of the zoom lens 21 is short, so that it can be miniaturized, and good optical performance can be effectively maintained. It can be understood that the miniaturized zoom lens 21 is more suitable for electronic devices 100 with requirements for thinness and lightness, such as mobile phones.

[0068] Please refer to Figure 4 , the first lens group G1 includes a first lens L1, and the zoom lens 21 satisfies the following relationship: 0.5 < fL1 / fg1 < 1, where fL1 is the focal length of the first lens L1, and fg1 is the focal length of the first lens group G1.

[0069] Among them, the ratio of fL1 / fg1 (the ratio of fL1 to fg1) can be but is not limited to 0.5, 0.6, 0.65, 0.7, 0.73, 0.8, 0.86, 0.9, 0.98, etc.

[0070] In this embodiment, the ratio of the focal length fL1 of the first lens L1 to the focal length fg1 of the first lens group G1 is set to be greater than 0.5 and less than 1, so that the overall aberration of the zoom lens 21 can be reduced. If it exceeds the above range, the aberration will increase.

[0071] Please refer to Figure 4 The second lens group G2 includes a third lens L3, a fourth lens L4, and a fifth lens L5 that are sequentially arranged along the optical axis X from the object side to the image side. The zoom lens 21 satisfies the following relational expression: 0.3 < fL3 / fL5 < 0.8, where fL3 is the focal length of the third lens L3 and fL5 is the focal length of the fifth lens L5.

[0072] Among them, fL3 / fL5 (the ratio of fL3 to fL5) can be but is not limited to 0.4, 0.45, 0.49, 0.5, 0.52, 0.55, 0.58, 0.6, 0.66, 0.68, 0.7, 0.72, 0.74, 0.75, 0.78, etc.

[0073] In this embodiment, the ratio of the focal length fL3 of the third lens L3 to the focal length fg5 of the fifth lens L5 is set to be greater than 0.3 and less than 0.8, so that the overall aberration of the zoom lens 21 can be reduced. If it exceeds the above range, the aberration will increase.

[0074] Please refer to Figure 4 The second lens group G2 includes a third lens L3, and the zoom lens 21 satisfies the following relational expression: Vd3 > 60, where Vd3 is the Abbe number of the material of the third lens L3.

[0075] Among them, Vd3 can be but is not limited to 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, etc.

[0076] In this embodiment, setting the Abbe number of the material of the third lens L3 to be greater than 60 can reduce chromatic aberration.

[0077] Please refer to Figure 4 The zoom lens 21 satisfies the following relational expression: -1.0 < fg2 / fg3 < -0.5, where fg2 is the focal length of the second lens group G2 and fg3 is the focal length of the third lens group G3.

[0078] Among them, fg2 / fg3 (the ratio of fg2 to fg3) can be but is not limited to -0.98, -0.95, -0.92, -0.9, -0.87, -0.85, -0.83, -0.8, -0.75, -0.71, -0.7, -0.68, -0.65, -0.6.

[0079] In this embodiment, the ratio of the focal length fg2 of the second lens group G2 to the focal length fg3 of the third lens group G3 is set to be greater than -1.0 and less than -0.5, which enables the zoom lens group to have a macro shooting function, and the macro shooting distance at the telephoto end within this condition range can be achieved to be less than 5 cm.

[0080] Please refer to Figure 4 , the zoom lens 21 satisfies the following relationship: fzw / EPDzw < 2.7, where fzw is the focal length at the wide-angle end, and EPDzw is the entrance pupil diameter at the wide-angle end, which can also be called the incident pupil diameter.

[0081] Among them, fzw / EPDzw (the ratio of fzw to EPDzw) can be but is not limited to 2.6, 2.59, 2.58, 2.57, 2.56, 2.55, 2.53, 2.52, 2.51, 2.5, 2.46, 2.42, 2.39, 2.38, 2.37, 2.36, 2.35, 2.33, 2.32, 2.31, 2.3, 2.2, 2.1, 2, etc.

[0082] In this embodiment, fzw / EPDzw represents the f-number (or aperture number) at the wide-angle end. By setting the ratio of the focal length fzw at the wide-angle end to the entrance pupil diameter EPDzw at the wide-angle end to be less than 2.7, the wide-angle end has a large aperture, thereby improving the brightness and defocusing effect of the lens. Among them, when the brightness of the lens is improved, the amount of light entering the lens is more, which also means that clear imaging can be achieved even at night.

[0083] Please refer to Figure 4 , the zoom lens 21 satisfies the following relationship: 1.5 < tan(hFOVw) / tan(hFOVt), where hFOVw is the half picture angle when the zoom lens 21 is at the wide-angle end, and hFOVt is the half picture angle when the zoom lens 21 is at the telephoto end. Among them, the half picture angle refers to half of the field of vision (Field of Vision, FOV), that is, the half field of view angle.

[0084] Among them, tan(hFOVw) / tan(hFOVt) can be but is not limited to 1.6, 1.71, 1.8, 1.9, 2.0, 2.1, 2.2, 2.25, etc.

[0085] In this embodiment, by setting the ratio of tan(hFOVw) to tan(hFOVt) to be greater than 1.5, the zoom ratio of the zoom lens 21 is more than 1.5 times.

[0086] Please refer to Figure 4The zoom lens 21 satisfies the following relationship: P31R1<0, P31R2<0, where P31R1 is the object-side radius of curvature of the lens closest to the second lens group G2 in the third lens group G3, that is, the object-side radius of curvature of the first lens (sixth lens L6) in the third lens group G3, and P31R2 is the image-side radius of curvature of the lens closest to the second lens group G2 in the third lens group G3, that is, the image-side radius of curvature of the first lens (sixth lens L6) in the third lens group G3.

[0087] In this embodiment, if the zoom lens 21 satisfies the relationship: P31R1<0, P31R2<0, then the difference in the Chief Ray Angle (CRA) between the wide-angle and telephoto ends can be ensured to be small. CRA is a parameter of the sensor; light needs to be incident on the sensor at a required angle. For the zoom lens 21, the CRA at the wide-angle and telephoto ends needs to be as consistent as possible. Therefore, setting the above relationship ensures that the zoom lens 21 has good image quality.

[0088] Please refer to Figure 4 The zoom lens 21 also includes an aperture stop, which is located on the object side of the second lens group G2 or inside the second lens group G2. That is, the aperture stop can be located outside the second lens group G2 or between two adjacent lenses in the second lens group G2. During zooming, the aperture stop and the second lens group G2 move together. In other words, the aperture stop and the second lens group G2 are relatively fixed; "relatively fixed" means that the aperture stop and the second lens group G2 move synchronously together. The aperture stop can be fixed to the second lens group G2 or to other components; no limitation is made here. Because the lenses in the second lens group G2 are more sparsely arranged, while the lenses in the first lens group G1 are more densely arranged, placing the aperture stop together with the second lens group G2 makes efficient use of space. Furthermore, the radial dimensions of the lenses in the second lens group G2 are smaller, making it easier to place the aperture stop together with the second lens group G2.

[0089] The zoom lens 21 provided in this application will be further described below through three specific embodiments. In the following embodiments, the surface type of each lens is aspherical, and the calculation formula for each aspherical surface is as follows:

[0090]

[0091] Where x is the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the radius of curvature R in the table below); k is the conic coefficient (see table); Ai is the i-th order aspherical coefficient (see table).

[0092] Example 1

[0093] Please refer to Figure 4 ,in, Figure 4 (a) in the diagram is a schematic diagram of the zoom lens 21 at the wide-angle end. Figure 4 (b) is a schematic diagram of the zoom lens 21 at the telephoto end. The zoom lens 21 provided in this embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially along the optical axis X from the object side to the image side. The first lens group G1 includes a first lens L1 and a second lens L2. The second lens group G2 includes a third lens L3, a fourth lens L4, and a fifth lens L5. The third lens group G3 includes a sixth lens L6 and a seventh lens L7. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are arranged sequentially along the optical axis X from the object side to the image side. The zoom lens 21 also includes an aperture stop, which is disposed between the second lens L2 and the third lens L3.

[0094] In Example 1, the field of view (FOV) is 34.7° to 22.7°, the F-number (Fno) is 2.4 to 3.6, and the sensor size is 1 / 1.56 inch.

[0095] For specific data regarding the zoom lens provided in Example 1, please refer to Tables 1 to 4.

[0096] Table 1 lists the relevant parameters of each lens, aperture, filter, and image sensor in the zoom lens of Example 1, including radius of curvature R, spacing D, refractive index Nd, Abbe coefficient Vd, focal distance of each lens, focal length of the lens group, and focal length of the zoom lens. The units for radius of curvature R, spacing d, focal distance of each lens, focal length of the lens group, and focal length of the zoom lens are all millimeters (mm). In Table 1, surfaces numbered 1-18 are labeled sequentially from the object side to the image side, representing the surfaces of the photographed object, each lens, aperture, filter, and the imaging surface of the image sensor. The photographed object is denoted as OBJ, the aperture as STO, and the imaging surface as IMA.

[0097] It should be noted that the interval D represents the distance D between the current surface and the next surface along the optical axis. For example, in Table 1, the interval between surface 2 and surface 3 is 0.5, and the interval between surface 3 and surface 4 is 0.111.

[0098]

[0099]

[0100] Table 2 shows the focal length EFL and variable spacing D of the zoom lens in Example 1 when it is at the wide-angle end and the telephoto end, respectively.

[0101]

[0102] Table 3 shows the k-values ​​and i-th order aspherical coefficients Ai of each lens in Example 1. Table 3 includes Table 3a, Table 3b, Table 3c, and Table 3d.

[0103]

[0104]

[0105]

[0106]

[0107]

[0108] Table 4 shows the overall parameter data of the zoom lens in Example 1.

[0109]

[0110]

[0111] In this embodiment, the zoom lens 21 group is switched between the wide-angle end and the telephoto end by changing the interval DZ1 between the first lens group G1 and the aperture stop along the optical axis X (i.e., the interval between the image side of the second lens L2 and the object side of the aperture stop along the optical axis X), the interval DZ2 between the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the interval between the image side of the fifth lens L5 and the object side of the sixth lens L6 along the optical axis X), and the interval DZ3 between the third lens group G3 and the filter 22 along the optical axis X (i.e., the interval between the image side of the seventh lens L7 and the filter 22 along the optical axis X).

[0112] Please refer to Figures 5 to 8 , Figures 5 to 8 The relevant curves at the wide-angle end of the zoom lens are shown.

[0113] Figure 5 This is an astigmatism diagram of the zoom lens at the wide-angle end in Example 1. The dashed lines represent the meridian, and the solid lines represent the sagittal, corresponding to a light wavelength of 555nm.

[0114] Figure 6 This is a spherical aberration diagram of the zoom lens at the wide-angle end in Example 1. The dotted lines correspond to a wavelength of 650 nm, the solid lines to a wavelength of 555 nm, and the dashed lines to a wavelength of 470 nm.

[0115] Figure 7 This is a distortion diagram of the zoom lens at the wide-angle end in Example 1. The wavelength of the light in the diagram is 555nm.

[0116] Figure 8 This is a transverse chromatic aberration diagram based on 555nm when the zoom lens is at the wide-angle end in Example 1. The dashed line in the diagram corresponds to a light wavelength of 470nm, and the solid line corresponds to a light wavelength of 650nm.

[0117] Please refer to Figures 9 to 12 , Figures 9 to 12 The diagram shows the relevant curves at the telephoto end of the zoom lens.

[0118] Figure 9 This is an astigmatism diagram when the zoom lens is at the telephoto end in Example 1. The dashed line in the diagram represents the meridian, and the solid line represents the sagitta, corresponding to a light wavelength of 555nm.

[0119] Figure 10 This is a spherical aberration diagram of the zoom lens at the telephoto end in Example 1. The dotted lines correspond to a wavelength of 650 nm, the solid lines to a wavelength of 555 nm, and the dashed lines to a wavelength of 470 nm.

[0120] Figure 11 This is a distortion diagram of the zoom lens in Example 1 when it is at the telephoto end. The wavelength of the light in the diagram is 555nm.

[0121] Figure 12 This is a transverse chromatic aberration diagram based on 555nm when the zoom lens is at the telephoto end in Example 1. The dashed line in the diagram corresponds to a light wavelength of 470nm, and the solid line corresponds to a light wavelength of 650nm.

[0122] according to Figures 5 to 12 It can be seen that the zoom lens given in Example 1 has good image quality at both the wide-angle and telephoto ends.

[0123] Example 2

[0124] Please refer to Figure 13 ,in, Figure 13 (a) in the diagram is a schematic diagram of the zoom lens 21 at the wide-angle end. Figure 13(b) is a schematic diagram of the zoom lens 21 at the telephoto end. The zoom lens 21 provided in this embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially along the optical axis X from the object side to the image side. The first lens group G1 includes a first lens L1 and a second lens L2. The second lens group G2 includes a third lens L3, a fourth lens L4, and a fifth lens L5. The third lens group G3 includes a sixth lens L6 and a seventh lens L7. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are arranged sequentially along the optical axis X from the object side to the image side. The zoom lens 21 also includes an aperture stop, which is disposed between the second lens L2 and the third lens L3.

[0125] In Example 2, the field of view (FOV) is 34.5° to 21.4°, the F-number (Fno) is 2.4 to 3.5, and the sensor size is 1 / 1.56 inch.

[0126] For specific data regarding the zoom lens provided in Example 2, please refer to Tables 5 to 8.

[0127] Table 5 lists the relevant parameters of each lens, aperture, filter, and image sensor in the zoom lens of Example 2, including radius of curvature R, spacing D, refractive index Nd, Abbe number Vd, focal distance of each lens, focal length of the lens group, and focal length of the zoom lens. The units for radius of curvature R, spacing d, focal distance of each lens, focal length of the lens group, and focal length of the zoom lens are all millimeters (mm). In Table 1, surfaces numbered 1-18 are labeled sequentially from the object side to the image side, representing the surfaces of the photographed object, each lens, aperture, filter, and the imaging surface of the image sensor. The photographed object is denoted as OBJ, the aperture as STO, and the imaging surface as IMA.

[0128] It should be noted that the interval D represents the distance D between the current surface and the next surface along the optical axis. For example, in Table 5, the interval between surface 2 and surface 3 is 0.587, and the interval between surface 3 and surface 4 is 0.1.

[0129]

[0130] Table 6 shows the focal length EFL and variable spacing D of the zoom lens in Example 2 when it is at the wide-angle end and the telephoto end, respectively.

[0131]

[0132] Table 7 shows the k-values ​​and i-th order aspherical coefficients Ai for each lens in Example 2. Table 7 includes Table 7a, Table 7b, Table 7c, and Table 7d.

[0133]

[0134]

[0135]

[0136]

[0137]

[0138] Table 8 shows the overall parameter data of the zoom lens in Example 2.

[0139]

[0140] In this embodiment, the zoom lens 21 group is switched between the wide-angle end and the telephoto end by changing the interval DZ1 between the first lens group G1 and the aperture stop along the optical axis X (i.e., the interval between the image side of the second lens L2 and the object side of the aperture stop along the optical axis X), the interval DZ2 between the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the interval between the image side of the fifth lens L5 and the object side of the sixth lens L6 along the optical axis X), and the interval DZ3 between the third lens group G3 and the filter 22 along the optical axis X (i.e., the interval between the image side of the seventh lens L7 and the filter 22 along the optical axis X).

[0141] Please refer to Figures 14 to 17 , Figures 14 to 17 The relevant curves at the wide-angle end of the zoom lens are shown.

[0142] Figure 14 This is an astigmatism diagram when the zoom lens is at the wide-angle end in Example 2. The dashed lines represent the meridian, and the solid lines represent the sagitta, corresponding to a light wavelength of 555nm.

[0143] Figure 15 This is a spherical aberration diagram of the zoom lens at the wide-angle end in Example 2. The dotted lines correspond to a wavelength of 650nm, the solid lines to 555nm, and the dashed lines to 470nm.

[0144] Figure 16 This is a distortion diagram of the zoom lens at the wide-angle end in Example 2. The wavelength of the light in the diagram is 555nm.

[0145] Figure 17 This is a transverse chromatic aberration diagram based on 555nm when the zoom lens is at the wide-angle end in Example 2. The dashed line in the diagram corresponds to a light wavelength of 470nm, and the solid line corresponds to a light wavelength of 650nm.

[0146] Please refer to Figures 18 to 21 , Figures 18 to 21 The diagram shows the relevant curves at the telephoto end of the zoom lens.

[0147] Figure 18 This is an astigmatism diagram when the zoom lens is at the telephoto end in Example 2. The dashed lines represent the meridian, and the solid lines represent the sagittal, corresponding to a light wavelength of 555nm.

[0148] Figure 19 This is a spherical aberration diagram when the zoom lens is at the telephoto end in Example 2. The dotted lines in the diagram correspond to a wavelength of 650 nm, the solid lines to a wavelength of 555 nm, and the dashed lines to a wavelength of 470 nm.

[0149] Figure 20 This is a distortion diagram of the zoom lens at the telephoto end in Example 2. The wavelength of the light in the diagram is 555nm.

[0150] Figure 21 This is a transverse chromatic aberration diagram based on 555nm when the zoom lens is at the telephoto end in Example 2. The dashed line in the diagram corresponds to a light wavelength of 470nm, and the solid line corresponds to a light wavelength of 650nm.

[0151] according to Figures 14 to 21 It can be seen that the zoom lens given in Example 2 has good imaging quality at both the wide-angle and telephoto ends.

[0152] Example 3

[0153] Please refer to Figure 22 ,in, Figure 22 (a) in the diagram is a schematic diagram of the zoom lens 21 at the wide-angle end. Figure 22 (b) is a schematic diagram of the zoom lens 21 at the telephoto end. The zoom lens 21 provided in this embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially along the optical axis X from the object side to the image side. The first lens group G1 includes a first lens L1 and a second lens L2. The second lens group G2 includes a third lens L3, a fourth lens L4, and a fifth lens L5. The third lens group G3 includes a sixth lens L6 and a seventh lens L7. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are arranged sequentially along the optical axis X from the object side to the image side. The zoom lens 21 also includes an aperture stop, which is disposed between the second lens L2 and the third lens L3.

[0154] In Example 3, the field of view (FOV) is 35.3° to 21.5°, the F-number (Fno) is 2.4 to 3.5, and the sensor size is 1 / 1.56 inch.

[0155] For specific data regarding the zoom lens provided in Example 3, please refer to Tables 9 to 12.

[0156] Table 9 lists the relevant parameters of each lens, aperture, filter, and image sensor in the zoom lens of Example 3, including radius of curvature R, spacing D, refractive index Nd, Abbe number Vd, focal distance of each lens, focal length of the lens group, and focal length of the zoom lens. The units for radius of curvature R, spacing d, focal distance of each lens, focal length of the lens group, and focal length of the zoom lens are all millimeters (mm). In Table 9, surfaces numbered 1-18 are labeled sequentially from the object side to the image side, representing the surfaces of the photographed object, each lens, aperture, filter, and the imaging surface of the image sensor. The photographed object is denoted as OBJ, the aperture as STO, and the imaging surface as IMA.

[0157] It should be noted that the interval D represents the distance D between the current surface and the next surface along the optical axis. For example, in Table 9, the interval between surface 2 and surface 3 is 0.8, and the interval between surface 3 and surface 4 is 0.1.

[0158]

[0159]

[0160] Table 10 shows the focal length EFL and variable spacing D of the zoom lens in Example 3 when it is at the wide-angle end and the telephoto end, respectively.

[0161]

[0162] Table 11 shows the k-values ​​and i-th order aspherical coefficients Ai of the aspherical surfaces of each lens in Example 3. Table 11 includes Table 11a, Table 11b, Table 11c, and Table 11d.

[0163]

[0164]

[0165]

[0166]

[0167]

[0168] Table 12 shows the overall parameter data of the zoom lens in Example 3.

[0169]

[0170]

[0171] In this embodiment, the zoom lens 21 group is switched between the wide-angle end and the telephoto end by changing the interval DZ1 between the first lens group G1 and the aperture stop along the optical axis X (i.e., the interval between the image side of the second lens L2 and the object side of the aperture stop along the optical axis X), the interval DZ2 between the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the interval between the image side of the fifth lens L5 and the object side of the sixth lens L6 along the optical axis X), and the interval DZ3 between the third lens group G3 and the filter 22 along the optical axis X (i.e., the interval between the image side of the seventh lens L7 and the filter 22 along the optical axis X).

[0172] Please refer to Figures 23 to 26 , Figures 23 to 26 The relevant curves at the wide-angle end of the zoom lens are shown.

[0173] Figure 23 This is an astigmatism diagram of the zoom lens at the wide-angle end in Example 3. The dashed lines represent the meridian, and the solid lines represent the sagittal, corresponding to a light wavelength of 555nm.

[0174] Figure 24 This is a spherical aberration diagram of the zoom lens at the wide-angle end in Example 3. The dotted lines correspond to a wavelength of 650 nm, the solid lines to a wavelength of 555 nm, and the dashed lines to a wavelength of 470 nm.

[0175] Figure 25 This is a distortion diagram of the zoom lens at the wide-angle end in Example 3. The wavelength of the light in the diagram is 555nm.

[0176] Figure 26 This is a transverse chromatic aberration diagram based on 555nm when the zoom lens is at the wide-angle end in Example 3. The dashed line in the diagram corresponds to a light wavelength of 470nm, and the solid line corresponds to a light wavelength of 650nm.

[0177] Please refer to Figures 27 to 30 , Figures 27 to 30 The diagram shows the relevant curves at the telephoto end of the zoom lens.

[0178] Figure 27 This is an astigmatism diagram when the zoom lens is at the telephoto end in Example 3. The dashed line in the diagram represents the meridian, and the solid line represents the sagitta, corresponding to a light wavelength of 555nm.

[0179] Figure 28 This is a spherical aberration diagram when the zoom lens is at the telephoto end in Example 3. The dotted lines in the diagram correspond to a wavelength of 650 nm, the solid lines to a wavelength of 555 nm, and the dashed lines to a wavelength of 470 nm.

[0180] Figure 29This is a distortion diagram of the zoom lens at the telephoto end in Example 3. The wavelength of the light in the diagram is 555nm.

[0181] Figure 30 This is a transverse chromatic aberration diagram based on 555nm when the zoom lens is at the telephoto end in Example 3. The dashed line in the diagram corresponds to a light wavelength of 470nm, and the solid line corresponds to a light wavelength of 650nm.

[0182] according to Figures 23 to 30 It can be seen that the zoom lens given in Example 3 has good imaging quality at both the wide-angle and telephoto ends.

[0183] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, and such improvements and refinements are also considered to be within the protection scope of this application.

Claims

1. A zoom lens, characterized in that, The zoom lens consists of a first lens group, a second lens group, and a third lens group arranged in sequence from the object side to the image side along the optical axis. The zoom lens has a wide-angle end and a telephoto end. The second lens group and the third lens group can move along the optical axis to switch the zoom between the wide-angle end and the telephoto end to achieve continuous zoom. The zoom lens satisfies the following relational expression: TTL / fzt < 1.0; where TTL is the overall optical length of the zoom lens, and fzt is the focal length of the telephoto end. The first lens group has a negative optical power, the second lens group has a positive optical power, and the third lens group has a negative optical power. The first lens group consists of a first lens with a negative optical power and a second lens with a positive optical power. The second lens group consists of a third lens with a positive optical power, a fourth lens with a negative optical power, and a fifth lens with a positive optical power. The third lens group consists of a sixth lens with a positive optical power and a seventh lens with a negative optical power. The zoom lens satisfies the following relational expression: TTL / ImgH < 5, such that the overall length of the zoom lens is short, thereby enabling miniaturization, where ImgH is the image height.

2. The zoom lens as described in claim 1, characterized in that, During the zoom process of the zoom lens from the wide-angle end to the telephoto end, the second lens group moves along the optical axis towards the object side, and the third lens group moves along the optical axis towards the object side.

3. The zoom lens as described in claim 1, characterized in that, The first lens group includes a first lens. The zoom lens satisfies the following relational expression: 0.5 < fL1 / fg1 < 1, where fL1 is the focal length of the first lens, and fg1 is the focal length of the first lens group.

4. The zoom lens as described in claim 1, characterized in that, The first lens group includes a first lens and a second lens arranged in sequence from the object side to the image side along the optical axis. The second lens group includes a third lens, a fourth lens, and a fifth lens arranged in sequence from the object side to the image side along the optical axis. The zoom lens satisfies the following relational expression: 0.3 < fL3 / fL5 < 0.8, where fL3 is the focal length of the third lens, and fL5 is the focal length of the fifth lens.

5. The zoom lens as described in claim 1, characterized in that, The first lens group includes a first lens and a second lens arranged in sequence from the object side to the image side along the optical axis. The second lens group includes a third lens. The zoom lens satisfies the following relational expression: Vd3 > 60, where Vd3 is the Abbe number of the material of the third lens.

6. The zoom lens as described in claim 1, characterized in that, The zoom lens satisfies the following relational expression: -1.0 < fg2 / fg3 < -0.5, where fg2 is the focal length of the second lens group, and fg3 is the focal length of the third lens group.

7. The zoom lens as described in claim 1, characterized in that, The zoom lens satisfies the following relational expression: fzw / EPDzw < 2.7, where fzw is the focal length of the wide-angle end, and EPDzw is the entrance pupil diameter of the wide-angle end.

8. The zoom lens as described in claim 1, characterized in that, The zoom lens satisfies the following relational expression: 1.5 < tan(hFOVw) / tan(hFOVt), where hFOVw is the half picture angle of the zoom lens at the wide-angle end, and hFOVt is the half picture angle of the zoom lens at the telephoto end.

9. The zoom lens as described in claim 1, characterized in that, The zoom lens satisfies the following relationship: P31R1<0, P31R2<0, where P31R1 is the object-side radius of curvature of the lens closest to the second lens group in the third lens group, and P31R2 is the image-side radius of curvature of the lens closest to the second lens group in the third lens group.

10. The zoom lens as described in any one of claims 1 to 9, characterized in that, The zoom lens also includes an aperture stop, which is located on the object side of the second lens group or inside the second lens group, and the aperture stop and the second lens group move together during the zoom process.

11. A camera module, characterized in that, The camera module includes a photosensitive element and a zoom lens as described in any one of claims 1 to 10, wherein the photosensitive element is used to receive light from the zoom lens.

12. An electronic device, characterized in that, The electronic device includes a device body and a camera module as described in claim 11, wherein the camera module is mounted on the device body.

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