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 and a second lens group arranged from an object side to an image side; the first lens group has a negative refractive power, and the second lens group has a positive refractive power; the zoom lens has a telephoto end and a wide-angle end; the first lens group and the second lens group are movable along an optical axis direction to switch between the telephoto end and the wide-angle end; at least one lens in the zoom lens has a number of critical points greater than or equal to 2; the wide-angle end of the zoom lens satisfies a relationship: 2.5 < TTLw / ImgH < 4; wherein TTLw is an optical total length of the zoom lens at the wide-angle end, and ImgH is an image height. The zoom lens provided by the application can improve the imaging quality when applied to an electronic device.

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] With the development of camera technology, people have increasingly higher requirements for the image quality of cameras. In related technologies, in order to achieve wide-angle and telephoto shooting, a main camera lens and a telephoto lens are usually set up for independent shooting. However, this design will limit the improvement of image quality. Summary of the Invention

[0003] This application provides a zoom lens, a camera module, and an electronic device. When the zoom lens is applied to the electronic device, it can improve the image quality.

[0004] In a first aspect, this application provides a zoom lens, the zoom lens comprising: a first lens group and a second lens group arranged from the object side to the image side; the first lens group having negative optical power, and the second lens group having positive optical power; the zoom lens having a telephoto end and a wide-angle end, both the first lens group and the second lens group being movable along the optical axis to switch zoom between the telephoto end and the wide-angle end; at least one lens in the zoom lens having a critical point number greater than or equal to 2; the wide-angle end of the zoom lens satisfying the relationship: 2.5 < TTLw / ImgH < 4; where TTLw is the total optical length of the zoom lens when it is at the wide-angle end, and ImgH is the image height.

[0005] Secondly, this application also provides a camera module, which includes a filter, a photosensitive element, and a zoom lens. The zoom lens, filter, and photosensitive element are arranged sequentially along the optical axis, and the first lens group and the second lens group of the zoom lens can move relative to the photosensitive element along the optical axis.

[0006] Thirdly, this application also provides an electronic device, which includes a device body and a camera module. The device body has an opening, and the camera module is disposed in the device body corresponding to the opening. The zoom lens of the camera module can extend or retract into the device body through the opening in at least part.

[0007] In the zoom lens provided in this embodiment, since the first lens group and the second lens group can move along the optical axis, the zoom lens can switch between the telephoto and wide-angle ends by moving the first lens group and the second lens group. Compared with related technologies, the zoom lens provided in this embodiment is equivalent to integrating the telephoto lens and the main camera lens, thereby reducing the module size, lowering costs, and allowing for the use of a large-sensor image sensor, thereby improving image quality. Furthermore, since the zoom lens satisfies the above-mentioned relationship, the zoom lens can not only be miniaturized but also effectively maintain good optical performance. In addition, when the lens has two or more critical points, the shape change of the lens in the radial direction will be relatively gradual, thereby avoiding excessive lens thickness and reducing the space occupied by the lens in the object-to-image direction, thus enabling the zoom lens to be miniaturized, which is more conducive to its application in electronic devices with requirements for thinness and lightness. 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 for Figure 2 A schematic diagram of the electronic device from another perspective.

[0012] Figure 4 This is a schematic diagram of a camera module provided in one embodiment of this application.

[0013] Figure 5 This is a schematic diagram of the zoom lens provided in Embodiment 1 of this application in a retracted state.

[0014] Figure 6 for Figure 5 The diagram shows a zoom lens at both the wide-angle and telephoto ends.

[0015] Figure 7 This is a schematic diagram of a lens with a critical point provided in an embodiment of this application.

[0016] Figure 8The astigmatism curve is shown in Example 1 when the zoom lens is at the wide-angle end.

[0017] Figure 9 The on-axis chromatic aberration curve is shown in Example 1 when the zoom lens is at the wide-angle end.

[0018] Figure 10 The distortion curve is shown in Example 1 when the zoom lens is at the wide-angle end.

[0019] Figure 11 The astigmatism curve is shown in Example 1 when the zoom lens is at the telephoto end.

[0020] Figure 12 The on-axis chromatic aberration curve is shown in Example 1 when the zoom lens is at the telephoto end.

[0021] Figure 13 The distortion curve is shown in Example 1 when the zoom lens is at the telephoto end.

[0022] Figure 14 This is a schematic diagram of the zoom lens provided in Embodiment 2 of this application in a retracted state.

[0023] Figure 15 for Figure 14 The diagram shows a zoom lens at both the wide-angle and telephoto ends.

[0024] Figure 16 The astigmatism curve is shown in Example 2 when the zoom lens is at the wide-angle end.

[0025] Figure 17 The on-axis chromatic aberration curve is shown in Example 2 when the zoom lens is at the wide-angle end.

[0026] Figure 18 The distortion curve is shown in Example 2 when the zoom lens is at the wide-angle end.

[0027] Figure 19 The astigmatism curve is shown in Example 2 when the zoom lens is at the telephoto end.

[0028] Figure 20 The on-axis chromatic aberration curve is shown in Example 2 when the zoom lens is at the telephoto end.

[0029] Figure 21 The distortion curve is shown in Example 2 when the zoom lens is at the telephoto end.

[0030] Figure 22 This is a schematic diagram of the zoom lens provided in Embodiment 3 of this application in a retracted state.

[0031] Figure 23 for Figure 22The diagram shows a zoom lens at both the wide-angle and telephoto ends.

[0032] Figure 24 The astigmatism curve is shown in Example 3 when the zoom lens is at the wide-angle end.

[0033] Figure 25 The on-axis chromatic aberration curve is shown in Example 3 when the zoom lens is at the wide-angle end.

[0034] Figure 26 The distortion curve is shown in Example 3 when the zoom lens is at the wide-angle end.

[0035] Figure 27 The astigmatism curve is shown in Example 3 when the zoom lens is at the telephoto end.

[0036] Figure 28 The on-axis chromatic aberration curve is shown in Example 3 when the zoom lens is at the telephoto end.

[0037] Figure 29 The distortion curve is shown in Example 3 when the zoom lens is at the telephoto end.

[0038] Figure 30 This is a schematic diagram of the zoom lens provided in Embodiment 4 of this application in a retracted state.

[0039] Figure 31 for Figure 30 The diagram shows a zoom lens at both the wide-angle and telephoto ends.

[0040] Figure 32 The astigmatism curve is shown in Example 4 when the zoom lens is at the wide-angle end.

[0041] Figure 33 The on-axis chromatic aberration curve is shown in Example 4 when the zoom lens is at the wide-angle end.

[0042] Figure 34 The distortion curve is shown in Example 4 when the zoom lens is at the wide-angle end.

[0043] Figure 35 The astigmatism curve is shown in Example 4 when the zoom lens is at the telephoto end.

[0044] Figure 36 The on-axis chromatic aberration curve is shown in Example 4 when the zoom lens is at the telephoto end.

[0045] Figure 37 The distortion curve is shown in Example 4 when the zoom lens is at the telephoto end.

[0046] Figure 38 This is a schematic diagram of the zoom lens provided in Embodiment 5 of this application in a retracted state.

[0047] Figure 39 for Figure 38 The diagram shows a zoom lens at both the wide-angle and telephoto ends.

[0048] Figure 40 The astigmatism curve is shown in Example 5 when the zoom lens is at the wide-angle end.

[0049] Figure 41 The on-axis chromatic aberration curve is shown in Example 5 when the zoom lens is at the wide-angle end.

[0050] Figure 42 The distortion curve is shown in Example 5 when the zoom lens is at the wide-angle end.

[0051] Figure 43 The astigmatism curve is shown in Example 5 when the zoom lens is at the telephoto end.

[0052] Figure 44 The on-axis chromatic aberration curve is shown in Example 5 when the zoom lens is at the telephoto end.

[0053] Figure 45 The distortion curve is shown in Example 5 when the zoom lens is at the telephoto end.

[0054] Figure 46 This is a schematic diagram of the zoom lens provided in Embodiment 6 of this application in a retracted state.

[0055] Figure 47 for Figure 46 The diagram shows a zoom lens at both the wide-angle and telephoto ends.

[0056] Figure 48 The astigmatism curve is shown in Example 6 when the zoom lens is at the wide-angle end.

[0057] Figure 49 The on-axis chromatic aberration curve is shown in Example 6 when the zoom lens is at the wide-angle end.

[0058] Figure 50 The distortion curve is shown in Example 6 when the zoom lens is at the wide-angle end.

[0059] Figure 51 The astigmatism curve is shown in Example 6 when the zoom lens is at the telephoto end.

[0060] Figure 52 The on-axis chromatic aberration curve is shown in Example 6 when the zoom lens is at the telephoto end.

[0061] Figure 53 The distortion curve is shown in Example 6 when the zoom lens is at the telephoto end. Detailed Implementation

[0062] 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.

[0063] 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.

[0064] Please refer to Figures 1 to 3 This application provides an electronic device 100, which includes a device body 1 and a camera module 2. The device body 1 has an opening K14, and the camera module 2 is disposed within the device body 1 corresponding to the opening K14. The zoom lens 21 of the camera module 2 can extend or retract from the device body 1 at least partially through the opening K14. When the user needs to take a picture, the zoom lens 21 can be controlled to extend out of the device body 1 through the opening K14 (e.g., when taking a picture). Figure 2 (As shown). When the user does not need to take pictures, the zoom lens 21 can be controlled to retract into the device body 1 through the opening K14 (as shown). Figure 1 (As shown).

[0065] The electronic device 100 may be a mobile phone, tablet computer, laptop computer, wearable device (such as smartwatch, wristband, VR device, etc.), television, e-reader, etc.

[0066] 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 3 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.

[0067] 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.

[0068] Furthermore, the opening K14 can be formed on the back cover 13. In other embodiments, the opening K14 can also be formed on the display screen 11; or, the opening K14 can be formed on the middle frame 12. When the back cover 13 has the opening K14, the camera module 2 is a rear camera. When the display screen 11 has the opening K14, the camera module is a front camera. It is understood that the description of the device body 1 in this embodiment is merely an introduction to one application scenario of the camera module 2 and should not be construed as a limitation on the electronic device 100 provided in this application.

[0069] In related technologies, as people's pursuit of image quality for electronic devices with shooting capabilities increases—for example, high image quality and high pixel count—the design of the image sensor and lens in the camera module is usually required. For instance, using a large-sensor image sensor, since the distance between the image sensor and the lens is not adjustable, necessitates a longer distance between the lens and the image sensor. With a relatively constant field of view (FOV), a longer distance between the lens and the image sensor means a longer overall length for the camera module. When camera modules are used in electronic devices, the result is that the device body becomes increasingly thicker, hindering the pursuit of thinner and lighter designs. In other words, for thinner and lighter electronic devices, the length of the camera module is also limited due to the thickness constraints of the electronic device. When the thickness of the camera module is limited, the non-adjustable distance between the image sensor and the lens leads to a limited distance between the lens and the image sensor within the camera module. If the thickness of the camera module is designed to be thick, and the thickness of the electronic device is thin, the camera module may form a thick protrusion on the back cover of the electronic device. Therefore, when camera modules in related technologies are applied to electronic devices, it is impossible to achieve both the thinness and lightness of the electronic devices and the high imaging quality of the camera modules.

[0070] In the electronic device 100 provided in this application embodiment, since the zoom lens 21 can extend or retract into the device body 1 through the opening K14, the camera module 2 can have a large focal length without affecting the thickness of the electronic device 100, thereby solving the problem of incompatibility between the thinness of the electronic device 100 and the high imaging quality of the camera module 2.

[0071] Please refer to Figure 4 This application also provides a camera module 2, which includes a filter 22, a photosensitive element 23, and a zoom lens 21 as described in any of the following embodiments. The zoom lens 21, filter 22, and photosensitive element 23 are arranged sequentially along the optical axis X. During shooting, external light passes sequentially through the zoom lens 21 and filter 22, and finally reaches the photosensitive element 23. The first lens group G1 and the second lens group G2 of the zoom lens 21 can move relative to the photosensitive element 23 along the optical axis X. It should be noted that... Figure 4 The structure shown is merely illustrative and should not be construed as a limitation of this application.

[0072] The zoom lens 21 is used to collect light from the subject and focus it onto the photosensitive element 23. The filter 22 is used to eliminate unwanted light to improve effective resolution and color reproduction. The filter 22 can be, but is not limited to, an infrared filter 22. The photosensitive element 23 (Sensor), also called a photosensitive chip or image sensor, is used to receive light passing through the filter 22 and convert the light signal into an electrical signal. 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.

[0073] It should be noted that the imaging surface S231 and filter 22 mentioned in the following embodiments of zoom lens 21 are used to help describe the position of the first lens group G1 and the second lens group G2, etc., and do not mean that zoom lens 21 includes a photosensitive element 23 with imaging surface S231 and filter 22.

[0074] The zoom lens 21 in the above-mentioned camera module 2 is described in detail below with reference to the accompanying drawings.

[0075] Please refer to Figure 5This application also provides a zoom lens 21, which includes a first lens group G1 and a second lens group G2 arranged from the object side to the image side. The object side and image side refer to the side where the object being photographed is located, and the side where the image formed by the object is located, with the zoom lens 21 as the boundary, which is the image side. Therefore, during shooting, light first passes through the first lens group G1, which is closer to the object side, and then through the second lens group G2, which is closer to the image side.

[0076] The first lens group G1 has negative focal power, and the second lens group G2 has positive focal power. Focal power characterizes the ability of an optical system (lens or lens group) to deflect light rays. Generally, focal power is also the reciprocal of the image-side focal length. A positive focal power indicates that the optical system converges light rays, while a negative focal power indicates that the optical system diverges light rays.

[0077] Both the first lens group G1 and the second lens group G2 are used to achieve zoom by movement, and therefore can both be called zoom lens groups.

[0078] Either the first lens group G1 or the second lens group G2 is a compensation lens group. That is, the first lens group G1 is a compensation lens group, or the second lens group G2 is a compensation lens group. Here, the so-called compensation lens group refers to the lens group used to compensate for the image plane position so that the focus of the subject at different distances falls on the imaging plane S231.

[0079] Optionally, the lens on the object side of the first lens group G1 has negative optical power, thereby enabling the zoom lens 21 to provide better imaging results.

[0080] Optionally, the lens on the object side of the second lens group G2 has positive optical power, thereby enabling the zoom lens 21 to provide better imaging results.

[0081] In this context, the lens closest to the object side in the first lens group G1 refers to the lens in the first lens group G1 that is closest to the object side. Similarly, the lens closest to the object side in the second lens group G2 refers to the lens in the second lens group G2 that is closest to the object side.

[0082] Please refer to Figure 6The zoom lens 21 has a telephoto end and a wide-angle end. Both the first lens group G1 and the second lens group G2 can move along the optical axis X to switch between the telephoto end and the wide-angle end. The telephoto end refers to the state where the zoom lens 21 has its maximum focal length; this can also be called the telephoto state. The wide-angle end refers to the state where the zoom lens 21 has its minimum focal length; this can also be called the wide-angle state. The positions of the first lens group G1 and the second lens group G2 when the zoom lens 21 is at the telephoto end are different from those when the zoom lens 21 is at the wide-angle end. Therefore, the telephoto end and the wide-angle end represent two different shooting states of the zoom lens 21, with the telephoto end used for telephoto shooting and the wide-angle end used for wide-angle shooting.

[0083] In related technologies, mobile phones typically incorporate at least three lenses: a telephoto lens, a main camera lens, and an ultra-wide-angle lens. The telephoto lens is used for telescopic shooting, while the main camera and ultra-wide-angle lens are used for wide-angle shooting, with the main camera's field of view being smaller than that of the ultra-wide-angle lens. However, this design firstly results in a larger overall camera module size, increasing product costs. Furthermore, because the lenses for different purposes are set up independently, each lens can only be paired with a small-sensor image sensor, thus affecting image quality.

[0084] In the zoom lens 21 provided in this embodiment, since both the first lens group G1 and the second lens group G2 can move along the optical axis X, the zoom lens 21 can switch between the telephoto and wide-angle ends by moving the first lens group G1 and the second lens group G2. Compared with related technologies, the zoom lens 21 provided in this embodiment is equivalent to integrating the telephoto lens and the main camera lens, thereby reducing the module size and cost. Furthermore, it can be paired with a large-sensor image sensor 23 (such as a 1 / 1.28-inch image sensor 23) to achieve 50-megapixel imaging from the wide-angle end to the telephoto end, thereby improving image quality (such as achieving high-pixel shooting and reducing the signal-to-noise ratio).

[0085] Optionally, the wide-angle end of the zoom lens 21 satisfies the relationship: 2.5 < TTLw / ImgH < 4. Wherein, TTLw is the total optical length of the zoom lens 21 at the wide-angle end, and ImgH is the image height, which refers to half the diagonal length of the effective pixel area of ​​the imaging surface S231. It should be noted that the total optical length refers to the distance from the surface of the first lens group G1 closest to the object side to the imaging surface S231; for further descriptions of the total optical length, please refer to this section.

[0086] The TTLw / ImgH ratio can be, but is not limited to, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, etc. For example, TTLw is 20 mm and ImgH is 6.450 mm; or TTLt is 23.378 mm and ImgH is 6.450 mm; or TTLt is 23.5 mm and ImgH is 6.450 mm.

[0087] Because the zoom lens 21 satisfies the above relationship, it can not only be miniaturized but also effectively maintain good optical performance. It is understandable that the miniaturized zoom lens 21 is more suitable for electronic devices 100 that require a slim and lightweight design, such as mobile phones.

[0088] In related technologies, zoomable camera modules have been applied to electronic devices such as mobile phones that require a slim and lightweight design. Specifically, because zoom functionality requires the lens within the camera module to move relative to the photosensitive element, the total length of the camera module is inevitably relatively long, generally exceeding the thickness of the electronic device. To avoid excessive thickness in electronic devices, periscope cameras are currently commonly used, with their length direction aligned with the width (or length) direction of the electronic device; that is, the length direction of the periscope camera is perpendicular to the thickness direction of the electronic device. The periscope camera contains a prism that receives and reflects external light, allowing the reflected light to propagate along the length of the periscope camera. However, periscope cameras are suitable for telephoto shooting but not for wide-angle shooting because wide-angle shooting requires a large field of view. A larger field of view necessitates a thicker prism, which would then be insufficient to meet the thickness requirements of the electronic device. Furthermore, specifications such as aperture and peripheral brightness are also limited by the thickness of the prism.

[0089] In this application, when the zoom lens 21 is applied to the electronic device 100, the zoom lens 21 can extend or retract through the opening K14 on the device body 1, causing the first lens group G1 and the second lens group G2 to move relative to the photosensitive element 23, thereby achieving zoom. This structural form does not involve a prism, thus avoiding the technical problems caused by the aforementioned prism. Therefore, the zoom lens 21 provided in this application can improve image quality.

[0090] Please refer to Figure 5, the zoom lens 21 further has a retracted state. When the zoom lens 21 is in the retracted state, the following relationship is satisfied: cTTL < TTLw and cTTL < TTLt. Here, cTTL is the overall optical length of the zoom lens 21 when it is in the retracted state, and TTLt is the overall optical length of the zoom lens 21 when it is at the telephoto end. In other words, among the above three states, when the zoom lens 21 is in the retracted state, the overall optical length cTTL is the shortest, less than the overall optical lengths corresponding to the telephoto end and the wide-angle end. Therefore, cTTL is the minimum overall optical length of the zoom lens 21. Thus, when the user needs to take a photo, the zoom lens 21 can be controlled to extend to switch to the wide-angle end or the telephoto end. When there is no need to take a photo, the zoom lens 21 is controlled to shorten to switch to the retracted state. In combination with the electronic device 100 provided in the previous embodiment, when the zoom lens 21 extends to switch to the wide-angle end or the telephoto end, it extends out of the electronic device 100 through the opening K14. When the zoom lens 21 shortens to switch to the retracted state, the zoom lens 21 retracts into the electronic device 100.

[0091] Furthermore, the zoom lens 21 satisfies: cTTL < TTLt < TTLw. That is to say, the overall optical length TTLw of the zoom lens 21 when it is at the wide-angle end is greater than the overall optical length TTLt of the zoom lens 21 when it is at the telephoto end. Therefore, TTLw is the maximum overall optical length of the zoom lens 21.

[0092] In terms of zooming, during the process of the zoom lens 21 switching from the retracted state to the telephoto end, the first lens group G1 and the second lens group G2 move along the optical axis in the object side direction (please refer to Figure 5 and Figure 6 ). During the zooming process of the zoom lens 21 from the wide-angle end to the telephoto end, the first lens group G1 moves along the optical axis in the image side direction, and the second lens group G2 moves along the optical axis in the object side direction (please refer to a Figure 6 ).

[0093] Optionally, the retracted state of the zoom lens satisfies the relationship: 1 < cTTL / ImgH < 2. Here, cTTL is the overall optical length of the zoom lens 21 when it is in the retracted state, and ImgH is the image height.

[0094] Among them, cTTL / ImgH can be but not limited to 1.1, 1.2, 1.24, 1.3, 1.4, 1.5, 1.55, 1.6, 1.7, 1.8, 1.9, etc. For example, cTTL is 10.5 mm and ImgH is 6.45 mm; or cTTL is 9.97 mm and ImgH is 6.45 mm; or cTTL is 9.98 mm and ImgH is 6.45 mm.

[0095] As can be seen from the data above, when ImgH is 6.45mm, the maximum total optical length TTLw of the zoom lens 21 is about 20mm, and the minimum total optical length cTTL is about 10mm. Therefore, the zoom lens 21 provided in this application can be used on electronic devices 100 with requirements for thinness and lightness, such as mobile phones. This allows the zoom lens 21 to not only be miniaturized but also to effectively maintain good optical performance.

[0096] Optionally, when the zoom lens 21 is in the retracted state, both the first lens group G1 and the second lens group G2 are located inside the device body 1.

[0097] Optionally, when the zoom lens 21 is at the wide-angle end and the telephoto end, the first lens group G1 is at least partially located outside the device body 1, and the second lens group G2 is at least partially located outside the device body.

[0098] Please refer to Figure 6 The zoom lens also includes an aperture stop 211, which is disposed on the object side of the second lens group G2 or inside the second lens group G2. That is, the aperture stop 211 can be disposed on the outside of the second lens group G2 or between two adjacent lenses in the second lens group G2. During zooming, the aperture stop 211 and the second lens group G2 move synchronously. In other words, the aperture stop 211 and the second lens group G2 are relatively fixed; "relatively fixed" means that the aperture stop 211 and the second lens group G2 move together. The aperture stop 211 can be fixed to the second lens group G2 or to other components; no limitation is made here. Because the arrangement of the lenses in the second lens group G2 is relatively sparse, while the arrangement of the lenses in the first lens group G1 is relatively dense, placing the aperture stop 211 together with the second lens group G2 can make reasonable use of space. Furthermore, the radial dimensions of the lenses in the second lens group G2 are relatively small, making it easier to place the aperture stop 211 together with the second lens group G2.

[0099] Optional, please refer to Figure 5 and Figure 6 The zoom lens 21 further includes a third lens group G3 with negative optical power, which is fixedly mounted on the image side of the second lens group G2. The third lens group G3 is used to correct the chief ray angle (CRA) at the wide-angle and telephoto ends. CRA is a parameter of the sensor, indicating that light rays need to enter the sensor at a required angle. For the zoom lens 21, the CRA at the wide-angle and telephoto ends must be consistent. Therefore, the placement of the third lens group G3 ensures that the zoom lens 21 has good image quality.

[0100] Optionally, the total number of lenses in the first lens group is 2-3, that is, 2 or 3 lenses.

[0101] Optionally, the total number of lenses in the second lens group is 3-5, that is, 3, 4 or 5 lenses.

[0102] Optionally, when the zoom lens 21 includes a third lens group G3, the total number of lenses in the third lens group is 1-2, that is, 1 or 2 lenses.

[0103] It should be noted that, for a single lens, each lens in the first lens group G1, the second lens group G2, and the third lens group G3 can be a glass lens or a plastic lens. Each lens can have positive or negative optical power. Furthermore, the surface of the lens closer to the object side is called the object-side surface, and the surface of the lens closer to the image side is called the image-side surface. The object-side surface of each lens in the above three lens groups can be spherical, aspherical, etc., and similarly, the image-side surface of each lens can be spherical, aspherical, etc.

[0104] Optional, please refer to Figure 7 In the zoom lens 21, at least one lens has a critical point Q greater than or equal to 2. In other words, the zoom lens 21 includes at least one lens with 2 or more critical points Q. The critical point Q refers to a point on the lens surface that is tangent to a plane perpendicular to the optical axis X, excluding the point of intersection with the optical axis X. When a lens has 2 or more critical points Q, the shape change of the lens in the radial direction will be relatively gradual, thereby avoiding excessive lens thickness and reducing the space occupied by the lens in the object-to-image direction. This allows for miniaturization of the zoom lens 21, making it more suitable for use in electronic devices 100 with requirements for thinness and lightness.

[0105] Optional, please refer to Figure 4 The zoom lens 21 further includes a first support member 212 and a second support member 213. The first support member 212 can be sleeved on the outer periphery of the second support member 213. Both the first support member 212 and the second support member 213 can move relative to each other along the optical axis X. The first lens group G1 is fixed inside the first support member 212. The first support member 212 is used to drive the first lens group G1 to move relative to the photosensitive element 23 along the optical axis X. The second lens group G2 is fixed inside the second support member 213. The second support member 213 is used to drive the second lens group G2 to move relative to the photosensitive element 23 along the optical axis X. The first support member 212 can be disposed within the opening K14 of the electronic device 100, and the first support member 212 and the second support member 213 can extend or retract into the electronic device 100 through the opening K14. Of course, the support form of the first lens group G1 and the second lens group G2 can also be other methods. Figure 4The structure shown is merely illustrative and should not be construed as limiting this application.

[0106] Optionally, the zoom lens 21 satisfies the following relationship: 1 < fw / ImgH < 1.7, where fw is the focal length at the wide-angle end.

[0107] fw / ImgH can be, but is not limited to, 1.1, 1.2, 1.3, 1.32, 1.4, 1.5, 1.6, etc. For example, fw is 7mm and ImgH is 6.45mm; or fw is 8.5mm and ImgH is 6.45mm; or fw is 8.6mm and ImgH is 6.45mm.

[0108] In this embodiment, the ratio of the wide-angle focal length fw to the image height ImgH is set to be greater than 1 and less than 1.7, thereby ensuring that the focal length of the wide-angle end is within the commonly used focal length range of the main camera of the mobile phone.

[0109] Optionally, the zoom lens 21 satisfies the relationship: -3 < f1 / f2 < -1.2, where f1 is the focal length of the first lens group and f2 is the focal length of the second lens group.

[0110] f1 / f2 can be, but is not limited to, -2.9, -2.8, -2.7, -2.6, -2.5, -2.4, -2.3, -2.2, -2.1, -2, -1.9, -1.8, -1.7, -1.6, -1.5, -1.4, -1.3, etc. For example, f1 is -17.615mm and f2 is 8.495mm; or f1 is -13.251mm and f2 is 7.026mm; or f1 is -18.621mm and f2 is 8.523mm.

[0111] In this embodiment, the ratio of the focal length f1 of the first lens group G1 to the focal length f2 of the second lens group G2 is set to be greater than -3 and less than -1.2. Therefore, the optical power relationship between the first lens group G1 and the second lens group G2 can be reasonably allocated, and focusing and zooming can be better achieved.

[0112] Optionally, the zoom lens 21 satisfies the following relationship: 0.05 < Δd / TTLw < 0.25, where Δd is the distance the second lens group G2 moves during the zoom process of the zoom lens 21 from the wide-angle end to the telephoto end.

[0113] Δd / TTLw can be, but is not limited to, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, etc. For example, Δd is 1.705 mm and TTLw is 20 mm; or Δd is 1.787 mm and TTLw is 23.378 mm; or Δd is 1.831 mm and TTLw is 23.5 mm.

[0114] In this embodiment, the ratio of the moving distance of the second lens group G2 from the wide-angle end to the telephoto end to the maximum optical total length TTLw of the zoom lens 21 is reasonably set between 0.05 and 0.25, so that a large zoom ratio can be achieved with a small change in the lens group interval, which is beneficial to compressing the total length of the zoom lens 21.

[0115] Optionally, the zoom lens 21 satisfies the 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. Here, the half picture angle refers to half of the field of vision (FOV).

[0116] 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. For example, hFOVw is 52.806° and hFOVt is 32.913°; or hFOVw is 43.738° and hFOVt is 26.812°; or hFOVw is 43.935° and hFOVt is 26.855°.

[0117] 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.

[0118] Optionally, the zoom lens 21 satisfies the relationship ft / ENPt < 3, where ft is the focal length at the telephoto end and ENPt is the entrance pupil diameter when the zoom lens 21 is at the telephoto end.

[0119] The ratio ft / ENPt can be, but is not limited to, 2.9, 2.8, 2.7, 2.6, 2.5, 2.4, 2.3, 2.2, 2.1, 2, 1.9, 1.8, 1.7, 1.6, 1.5, etc. For example, ft is 10.3 mm and ENPt is 4.256 mm; or ft is 12.5 mm and ENPt is 5.208 mm; or ft is 12.5 mm and ENPt is 5.208 mm.

[0120] In this embodiment, by setting the ratio of the telephoto focal length to the entrance pupil diameter to be less than 3, the aperture of the telephoto end is set to below f / 3, thereby improving the lens's brightness and bokeh effect. Increased lens brightness means more light enters the lens, resulting in clearer imaging even at night.

[0121] Optionally, in any of the above embodiments, the total number of lenses N in the zoom lens 21 satisfies: 5 ≤ N ≤ 10. The total number of lenses N can be 5, 6, 7, 8, 9, or 10. For example, the first lens group G1 has a total of 2 lenses, the second lens group G2 has a total of 4 lenses, and the third lens group G3 has a total of 0 lenses. Alternatively, the first lens group G1 has a total of 2 lenses, the second lens group G2 has a total of 4 lenses, and the third lens group G3 has a total of 2 lenses.

[0122] 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 minimum total optical length (cTTL). When the total number of lenses N is less than 5, the imaging quality cannot be guaranteed; when the total number of lenses N is greater than 10, the total 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 of the application balances imaging quality and total optical length by selecting a total number of lenses between 5 and 10, thereby ensuring that the zoom lens 21 has a good imaging effect while also achieving the beneficial effect of miniaturization.

[0123] Using the zoom lens 21 provided in this application, the maximum total optical length (TTLw) of the zoom lens 21 can be controlled to be less than 26mm (e.g., 20mm). The minimum total optical length (cTTL) of the zoom lens 21 can be controlled to be less than 11mm (e.g., 10mm). The field of view at the wide-angle end can be less than 90 degrees (e.g., 85 degrees). The field of view at the telephoto end can be less than 52 degrees. Therefore, the zoom lens 21 provided in this application can not only be well adapted to electronic devices 100 with requirements for thinness and lightness, but also has excellent shooting performance.

[0124] The zoom lens 21 provided in this application will be further described below through three specific embodiments. In the following embodiments, the calculation formulas for each aspherical surface are as follows:

[0125]

[0126] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in the table below); k is the conic coefficient (see table); Ai is the i-th order aspherical coefficient.

[0127] Example 1

[0128] Please refer to Figure 5 and Figure 6 ,in, Figure 6 (a) is Figure 5 The diagram shown is a schematic of a zoom lens at the wide-angle end. Figure 6 (b) is Figure 5 The diagram shows a zoom lens 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 from the object side to the image side. The first lens group G1 includes a first lens L1 and a second lens L2 arranged from the object side to the image side. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged from the object side to the image side. The third lens group G3 includes a seventh lens L7. The zoom lens 21 also includes an aperture stop 211, which is disposed between the second lens L2 and the third lens L3.

[0129] For specific data regarding the zoom lens provided in Example 1, please refer to Tables 1 to 5.

[0130] Table 1 lists the relevant parameters of each lens, aperture, and filter in the zoom lens of Example 1, including radius of curvature R, spacing d, refractive index Nd, and Abbe number Vd. The units for radius of curvature R and spacing d are millimeters (mm). In Table 1, surfaces numbered 1-19 are labeled sequentially from the object side to the image side, representing the surface of the photographed object, each lens, aperture, filter, and imaging plane. The photographed object is denoted as OBJ, the aperture as STO, and the imaging plane as IMA.

[0131] 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 0.6, and the interval between surface 3 and surface 4 is 1.261. Please refer to the explanation here for any subsequent references to the interval d.

[0132]

[0133] Table 2 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 1, that is, the variable interval d corresponding to the zoom lens at the wide-angle end and the telephoto end.

[0134]

[0135] Table 3 shows the k-values ​​and aspherical coefficients of the aspherical surfaces of each lens in Example 1. Table 3 includes Table 3a, Table 3b, Table 3c, and Table 3d.

[0136]

[0137]

[0138]

[0139]

[0140]

[0141]

[0142] Table 4 shows the overall parameter data of the zoom lens in Example 1.

[0143]

[0144] Table 5 shows the conditional expressions and corresponding data for the zoom lens in Example 1. In the table below, N represents the number of lenses.

[0145]

[0146] In this embodiment, the zoom lens 21 group switches between the telephoto end, wide-angle end, and zoomed-out state by changing the distance d1 between the first lens group G1 and the aperture stop 211 along the optical axis X (i.e., the distance between the image side of the second lens L2 and the aperture stop 211 along the optical axis X), and the distance d2 between the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the distance between the image side of the sixth lens L6 and the object side of the seventh lens L7 along the optical axis X).

[0147] Please refer to Figures 8 to 10 , Figures 8 to 10 The relevant curves at the wide-angle end of the zoom lens are shown.

[0148] Figure 8 This is the astigmatism curve when the zoom lens is at the wide-angle end in Example 1. In the figure, the dashed line represents the meridian, and the solid line represents the sagitta, corresponding to a light wavelength of 587.6 nm.

[0149] Figure 9This is the on-axis chromatic aberration curve when the zoom lens is at the wide-angle end in Example 1. In the figure, the wavelength of light corresponding to the dotted line is 656.3nm, the wavelength of light corresponding to the solid line is 587.6nm, and the wavelength of light corresponding to the dashed line is 486.1nm.

[0150] Figure 10 The image shows the distortion curve when the zoom lens is at the wide-angle end in Example 1. The wavelength of the light in the figure is 587.6 nm.

[0151] Please refer to Figures 11 to 13 , Figures 11 to 13 The diagram shows the relevant curves at the telephoto end of the zoom lens.

[0152] Figure 11 This is the astigmatism curve when the zoom lens is at the telephoto end in Example 1. In the figure, the dashed line represents the meridion, and the solid line represents the sagitta, corresponding to a light wavelength of 587.6 nm.

[0153] Figure 12 This is the on-axis chromatic aberration curve when the zoom lens is at the telephoto end in Example 1. In the figure, the wavelength of light corresponding to the dotted line is 656.3nm, the wavelength of light corresponding to the solid line is 587.6nm, and the wavelength of light corresponding to the dashed line is 486.1nm.

[0154] Figure 13 The image shows the distortion curve when the zoom lens is at the telephoto end in Example 1. The wavelength of the light in the figure is 587.6 nm.

[0155] according to Figures 8 to 13 It can be seen that the zoom lens given in Example 1 has good image quality at both the wide-angle and telephoto ends.

[0156] Example 2

[0157] Please refer to Figure 14 and Figure 15 ,in, Figure 15 (a) is Figure 14 The diagram shown is a schematic of a zoom lens at the wide-angle end. Figure 15 (b) is Figure 14 The diagram shows a zoom lens 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 from the object side to the image side. The first lens group G1 includes a first lens L1 and a second lens L2 arranged from the object side to the image side. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged from the object side to the image side. The third lens group G3 includes a seventh lens L7. The zoom lens 21 also includes an aperture stop 211, which is disposed between the second lens L2 and the third lens L3.

[0158] For specific data regarding the zoom lens provided in Example 2, please refer to Tables 6 to 10.

[0159] Table 6 lists the relevant parameters of each lens, aperture, and filter in the zoom lens of Example 2, including radius of curvature R, spacing d, refractive index Nd, and Abbe number Vd. The units for radius of curvature R and spacing d are millimeters (mm). In Table 6, surfaces numbered 1-19 are labeled sequentially from the object side to the image side, representing the surface of the photographed object, each lens, aperture, filter, and the imaging plane. The photographed object is denoted as OBJ, the aperture as STO, and the imaging plane as IMA.

[0160]

[0161] Table 7 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 2, that is, the variable interval d corresponding to the zoom lens at the wide-angle end and the telephoto end.

[0162]

[0163] Table 8 shows the k-values ​​and aspherical coefficients of the aspherical surfaces of each lens in Example 2. Table 8 includes Table 8a, Table 8b, Table 8c, and Table 8d.

[0164]

[0165]

[0166]

[0167]

[0168]

[0169] Table 9 shows the overall parameter data of the zoom lens in Example 2.

[0170]

[0171]

[0172] Table 10 shows the conditional expressions and corresponding data for the zoom lens in Example 2. In the table below, N represents the number of lenses.

[0173]

[0174] In this embodiment, the zoom lens 21 group switches between the telephoto end, wide-angle end, and zoomed-out state by changing the distance d1 between the first lens group G1 and the aperture stop 211 along the optical axis X (i.e., the distance between the image side of the second lens L2 and the aperture stop 211 along the optical axis X), and the distance d2 between the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the distance between the image side of the sixth lens L6 and the object side of the seventh lens L7 along the optical axis X).

[0175] Please refer to Figures 16 to 18 , Figures 16 to 18 The relevant curves at the wide-angle end of the zoom lens are shown.

[0176] Figure 16 This is the astigmatism curve when the zoom lens is at the wide-angle end in Example 2. In the figure, the dashed line represents the meridian, and the solid line represents the sagitta, corresponding to a light wavelength of 587.6 nm.

[0177] Figure 17 This is the on-axis chromatic aberration curve when the zoom lens is at the wide-angle end in Example 2. In the figure, the wavelength of light corresponding to the dotted line is 656.3nm, the wavelength of light corresponding to the solid line is 587.6nm, and the wavelength of light corresponding to the dashed line is 486.1nm.

[0178] Figure 18 The image shows the distortion curve when the zoom lens is at the wide-angle end in Example 2. The wavelength of the light in the figure is 587.6 nm.

[0179] Please refer to Figures 19 to 21 , Figures 19 to 21 The diagram shows the relevant curves at the telephoto end of the zoom lens.

[0180] Figure 19 This is the astigmatism curve when the zoom lens is at the telephoto end in Example 2. The dashed line in the figure represents the meridion, and the solid line represents the sagitta, corresponding to a light wavelength of 587.6 nm.

[0181] Figure 20 This is the on-axis chromatic aberration curve when the zoom lens is at the telephoto end in Example 2. The dotted line corresponds to a wavelength of 656.3 nm, the solid line to a wavelength of 587.6 nm, and the dashed line to a wavelength of 486.1 nm.

[0182] Figure 21 The image shows the distortion curve when the zoom lens is at the telephoto end in Example 2. The wavelength of the light in the figure is 587.6 nm.

[0183] according to Figures 16 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.

[0184] Example 3

[0185] Please refer to Figure 22 and Figure 23 ,in, Figure 23 (a) is Figure 22 The diagram shown is a schematic of a zoom lens at the wide-angle end. Figure 23 (b) is Figure 22 The diagram shows a zoom lens 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 from the object side to the image side. The first lens group G1 includes a first lens L1 and a second lens L2 arranged from the object side to the image side. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged from the object side to the image side. The third lens group G3 includes a seventh lens L7. The zoom lens 21 also includes an aperture stop 211, which is disposed between the second lens L2 and the third lens L3.

[0186] For specific data regarding the zoom lens provided in Example 3, please refer to Tables 11 to 15.

[0187] Table 11 lists the relevant parameters of each lens, aperture, and filter in the zoom lens of Example 3, including radius of curvature R, spacing d, refractive index Nd, and Abbe coefficient Vd. The units for radius of curvature R and spacing d are millimeters (mm). In Table 11, surfaces numbered 1-19 are labeled sequentially along the object-side to image-side direction, representing the object being photographed, each lens, aperture, filter, and imaging plane. The object being photographed is denoted as OBJ, the aperture as STO, and the imaging plane as IMA.

[0188]

[0189]

[0190] Table 12 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 3, that is, the variable interval d corresponding to the zoom lens at the wide-angle end and the telephoto end.

[0191]

[0192] Table 13 shows the k-values ​​and aspherical coefficients of the aspherical surfaces of each lens in Example 3. Table 13 includes Table 13a, Table 13b, Table 13c, and Table 13d.

[0193]

[0194]

[0195]

[0196]

[0197]

[0198] Table 14 shows the overall parameter data of the zoom lens in Example 3.

[0199]

[0200]

[0201] Table 15 shows the conditional expressions and corresponding data for the zoom lens in Example 3. In the table below, N represents the number of lenses.

[0202]

[0203] In this embodiment, the zoom lens 21 group switches between the telephoto end, wide-angle end, and zoomed-out state by changing the distance d1 between the first lens group G1 and the aperture stop 211 along the optical axis X (i.e., the distance between the image side of the second lens L2 and the aperture stop 211 along the optical axis X), and the distance d2 between the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the distance between the image side of the sixth lens L6 and the object side of the seventh lens L7 along the optical axis X).

[0204] Please refer to Figures 24 to 26 , Figures 24 to 26 The relevant curves at the wide-angle end of the zoom lens are shown.

[0205] Figure 24 This is the astigmatism curve when the zoom lens is at the wide-angle end in Example 3. In the figure, the dashed line represents the meridian, and the solid line represents the sagitta, corresponding to a light wavelength of 587.6 nm.

[0206] Figure 25 This is the on-axis chromatic aberration curve when the zoom lens is at the wide-angle end in Example 3. In the figure, the wavelength of light corresponding to the dotted line is 656.3nm, the wavelength of light corresponding to the solid line is 587.6nm, and the wavelength of light corresponding to the dashed line is 486.1nm.

[0207] Figure 26 The image shows the distortion curve when the zoom lens is at the wide-angle end in Example 3. The wavelength of the light in the figure is 587.6 nm.

[0208] Please refer to Figures 27 to 29 , Figures 27 to 29 The diagram shows the relevant curves at the telephoto end of the zoom lens.

[0209] Figure 27 This is the astigmatism curve when the zoom lens is at the telephoto end in Example 3. In the figure, the dashed line represents the meridian, and the solid line represents the sagitta, corresponding to a light wavelength of 587.6 nm.

[0210] Figure 28 This is the on-axis chromatic aberration curve when the zoom lens is at the telephoto end in Example 3. In the figure, the wavelength of light corresponding to the dotted line is 656.3nm, the wavelength of light corresponding to the solid line is 587.6nm, and the wavelength of light corresponding to the dashed line is 486.1nm.

[0211] Figure 29 The image shows the distortion curve when the zoom lens is at the telephoto end in Example 3. The wavelength of the light in the figure is 587.6 nm.

[0212] according to Figures 24 to 29 It can be seen that the zoom lens given in Example 3 has good imaging quality at both the wide-angle and telephoto ends.

[0213] Example 4

[0214] Please refer to Figure 30 and Figure 31 ,in, Figure 31 (a) is Figure 30 The diagram shown is a schematic of a zoom lens at the wide-angle end. Figure 31 (b) is Figure 30 The diagram shows a zoom lens 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 from the object side to the image side. The first lens group G1 includes a first lens L1 and a second lens L2 arranged from the object side to the image side. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged from the object side to the image side. The third lens group G3 includes a seventh lens L7 and an eighth lens L8 arranged from the object side to the image side. The zoom lens 21 also includes an aperture stop 211, which is disposed between the second lens L2 and the third lens L3.

[0215] For specific data regarding the zoom lens provided in Example 4, please refer to Tables 16 to 20.

[0216] Table 16 lists the relevant parameters of each lens, aperture, and filter in the zoom lens of Example 4, including radius of curvature R, spacing d, refractive index Nd, and Abbe number Vd. The units for radius of curvature R and spacing d are millimeters (mm). In Table 16, surfaces numbered 1-21 are sequentially labeled along the object-side to image-side direction, representing the object being photographed, each lens, aperture, filter, and imaging plane. The object being photographed is denoted as OBJ, the aperture as STO, and the imaging plane as IMA.

[0217]

[0218] Table 17 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 4, that is, the variable interval d corresponding to the zoom lens being at the wide-angle end and the telephoto end.

[0219]

[0220] Table 18 shows the k-values ​​and aspherical coefficients of the aspherical surfaces of each lens in Example 4. Table 18 includes Table 18a, Table 18b, Table 18c, and Table 18d.

[0221]

[0222]

[0223]

[0224]

[0225]

[0226]

[0227] Table 19 shows the overall parameter data of the zoom lens in Example 4.

[0228]

[0229] Table 20 shows the conditional expressions and corresponding data for the zoom lens in Example 4. In the table below, N represents the number of lenses.

[0230]

[0231]

[0232] In this embodiment, the zoom lens 21 group switches between the telephoto end, wide-angle end, and zoomed-out state by changing the distance d1 between the first lens group G1 and the aperture stop 211 along the optical axis X (i.e., the distance between the image side of the second lens L2 and the aperture stop 211 along the optical axis X), and the distance d2 between the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the distance between the image side of the sixth lens L6 and the object side of the seventh lens L7 along the optical axis X).

[0233] Please refer to Figures 32 to 34 , Figures 32 to 34 The relevant curves at the wide-angle end of the zoom lens are shown.

[0234] Figure 32 This is the astigmatism curve when the zoom lens is at the wide-angle end in Example 4. In the figure, the dashed line represents the meridion, and the solid line represents the sagitta, corresponding to a light wavelength of 587.6 nm.

[0235] Figure 33This is the on-axis chromatic aberration curve when the zoom lens is at the wide-angle end in Example 4. In the figure, the wavelength of light corresponding to the dotted line is 656.3nm, the wavelength of light corresponding to the solid line is 587.6nm, and the wavelength of light corresponding to the dashed line is 486.1nm.

[0236] Figure 34 The image shows the distortion curve when the zoom lens is at the wide-angle end in Example 4. The wavelength of the light in the figure is 587.6 nm.

[0237] Please refer to Figures 35 to 37 , Figures 35 to 37 The diagram shows the relevant curves at the telephoto end of the zoom lens.

[0238] Figure 35 This is the astigmatism curve when the zoom lens is at the telephoto end in Example 4. In the figure, the dashed line represents the meridion, and the solid line represents the sagitta, corresponding to a light wavelength of 587.6 nm.

[0239] Figure 36 This is the on-axis chromatic aberration curve when the zoom lens is at the telephoto end in Example 4. In the figure, the wavelength of light corresponding to the dotted line is 656.3nm, the wavelength of light corresponding to the solid line is 587.6nm, and the wavelength of light corresponding to the dashed line is 486.1nm.

[0240] Figure 37 The image shows the distortion curve when the zoom lens is at the telephoto end in Example 4. The wavelength of the light in the figure is 587.6 nm.

[0241] according to Figures 32 to 37 It can be seen that the zoom lens given in Example 4 has good image quality at both the wide-angle and telephoto ends.

[0242] Example 5

[0243] Please refer to Figure 38 and Figure 39 ,in, Figure 39 (a) is Figure 38 The diagram shown is a schematic of a zoom lens at the wide-angle end. Figure 39 (b) is Figure 38 The diagram shows a zoom lens 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 from the object side to the image side. The first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3 arranged from the object side to the image side. The second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged from the object side to the image side. The third lens group G3 includes an eighth lens L8. The zoom lens 21 also includes an aperture stop 211, which is disposed between the third lens L3 and the fourth lens L4.

[0244] For specific data regarding the zoom lens provided in Example 5, please refer to Tables 21 to 25.

[0245] Table 21 lists the relevant parameters of each lens, aperture, and filter in the zoom lens of Example 5, including radius of curvature R, spacing d, refractive index Nd, and Abbe coefficient Vd. The units for radius of curvature R and spacing d are millimeters (mm). In Table 21, surfaces numbered 1-21 are sequentially labeled along the object-side to image-side direction, representing the object being photographed, each lens, aperture, filter, and imaging plane. The object being photographed is denoted as OBJ, the aperture as STO, and the imaging plane as IMA.

[0246]

[0247]

[0248] Table 22 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 5, that is, the variable interval d corresponding to the zoom lens being at the wide-angle end and the telephoto end.

[0249]

[0250] Table 23 shows the k-values ​​and aspherical coefficients of the aspherical surfaces of each lens in Example 5. Table 23 includes Table 23a, Table 23b, Table 23c, and Table 23d.

[0251]

[0252]

[0253]

[0254]

[0255]

[0256] Table 24 shows the overall parameter data of the zoom lens in Example 5.

[0257]

[0258]

[0259] Table 25 shows the conditional expressions and corresponding data for the zoom lens in Example 5. In the table below, N represents the number of lenses.

[0260]

[0261] In this embodiment, the zoom lens 21 group switches between the telephoto end, wide-angle end, and zoomed-out state by changing the distance d1 between the first lens group G1 and the aperture stop 211 along the optical axis X (i.e., the distance between the image side of the third lens L3 and the aperture stop 211 along the optical axis X), and the distance d2 between the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the distance between the image side of the seventh lens L7 and the object side of the eighth lens L8 along the optical axis X).

[0262] Please refer to Figures 40 to 42 , Figures 40 to 42 The relevant curves at the wide-angle end of the zoom lens are shown.

[0263] Figure 40 This is the astigmatism curve when the zoom lens is at the wide-angle end in Example 5. In the figure, the dashed line represents the meridion, and the solid line represents the sagitta, corresponding to a light wavelength of 587.6 nm.

[0264] Figure 41 This is the on-axis chromatic aberration curve when the zoom lens is at the wide-angle end in Example 5. In the figure, the wavelength of light corresponding to the dotted line is 656.3nm, the wavelength of light corresponding to the solid line is 587.6nm, and the wavelength of light corresponding to the dashed line is 486.1nm.

[0265] Figure 42 The image shows the distortion curve when the zoom lens is at the wide-angle end in Example 5. The wavelength of the light in the figure is 587.6 nm.

[0266] Please refer to Figures 43 to 45 , Figures 43 to 45 The diagram shows the relevant curves at the telephoto end of the zoom lens.

[0267] Figure 43 This is the astigmatism curve when the zoom lens is at the telephoto end in Example 5. In the figure, the dashed line represents the meridion, and the solid line represents the sagitta, corresponding to a light wavelength of 587.6 nm.

[0268] Figure 44 This is the on-axis chromatic aberration curve when the zoom lens is at the telephoto end in Example 5. In the figure, the wavelength of light corresponding to the dotted line is 656.3nm, the wavelength of light corresponding to the solid line is 587.6nm, and the wavelength of light corresponding to the dashed line is 486.1nm.

[0269] Figure 45 The image shows the distortion curve when the zoom lens is at the telephoto end in Example 5. The corresponding light wavelength in the figure is 587.6 nm.

[0270] according to Figures 40 to 45 It can be seen that the zoom lens given in Example 5 has good image quality at both the wide-angle and telephoto ends.

[0271] Example 6

[0272] Please refer to Figure 46 and Figure 47 ,in, Figure 47 (a) is Figure 46 The diagram shown is a schematic of a zoom lens at the wide-angle end. Figure 47 (b) is Figure 46 The diagram shows a zoom lens 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 from the object side to the image side. The first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3 arranged from the object side to the image side. The second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged from the object side to the image side. The third lens group G3 includes an eighth lens L8. The zoom lens 21 also includes an aperture stop 211, which is disposed between the third lens L3 and the fourth lens L4.

[0273] For specific data regarding the zoom lens provided in Example 6, please refer to Tables 26 to 30.

[0274] Table 26 lists the relevant parameters of each lens, aperture, and filter in the zoom lens of Example 6, including radius of curvature R, spacing d, refractive index Nd, and Abbe coefficient Vd. The units for radius of curvature R and spacing d are millimeters (mm). In Table 26, surfaces numbered 1-21 are sequentially labeled along the object-side to image-side direction, representing the object being photographed, each lens, aperture, filter, and imaging plane. The object being photographed is denoted as OBJ, the aperture as STO, and the imaging plane as IMA.

[0275]

[0276] Table 27 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 6, that is, the variable interval d corresponding to the zoom lens being at the wide-angle end and the telephoto end.

[0277]

[0278] Table 28 shows the k-values ​​and aspherical coefficients of the aspherical surfaces of each lens in Example 6. Table 28 includes Tables 28a, 28b, 28c, 28d, and 28e.

[0279]

[0280]

[0281]

[0282]

[0283]

[0284]

[0285]

[0286] Table 29 shows the overall parameter data of the zoom lens in Example 6.

[0287]

[0288]

[0289] Table 30 shows the conditional expressions and corresponding data for the zoom lens in Example 6. In the table below, N represents the number of lenses.

[0290]

[0291] In this embodiment, the zoom lens 21 group switches between the telephoto end, wide-angle end, and zoomed-out state by changing the distance d1 between the first lens group G1 and the aperture stop 211 along the optical axis X (i.e., the distance between the image side of the third lens L3 and the aperture stop 211 along the optical axis X), and the distance d2 between the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the distance between the image side of the seventh lens L7 and the object side of the eighth lens L8 along the optical axis X).

[0292] Please refer to Figures 48 to 50 , Figures 48 to 50 The relevant curves at the wide-angle end of the zoom lens are shown.

[0293] Figure 48 This is the astigmatism curve when the zoom lens is at the wide-angle end in Example 6. In the figure, the dashed line represents the meridion, and the solid line represents the sagitta, corresponding to a light wavelength of 587.6 nm.

[0294] Figure 49 This is the on-axis chromatic aberration curve when the zoom lens is at the wide-angle end in Example 6. In the figure, the wavelength of light corresponding to the dotted line is 656.3nm, the wavelength of light corresponding to the solid line is 587.6nm, and the wavelength of light corresponding to the dashed line is 486.1nm.

[0295] Figure 50 The image shows the distortion curve when the zoom lens is at the wide-angle end in Example 6. The wavelength of the light in the figure is 587.6 nm.

[0296] Please refer to Figures 51 to 53 , Figures 51 to 53 The diagram shows the relevant curves at the telephoto end of the zoom lens.

[0297] Figure 51This is the astigmatism curve when the zoom lens is at the telephoto end in Example 6. In the figure, the dashed line represents the meridion, and the solid line represents the sagitta, corresponding to a light wavelength of 587.6 nm.

[0298] Figure 52 This is the on-axis chromatic aberration curve when the zoom lens is at the telephoto end in Example 6. In the figure, the wavelength of light corresponding to the dotted line is 656.3nm, the wavelength of light corresponding to the solid line is 587.6nm, and the wavelength of light corresponding to the dashed line is 486.1nm.

[0299] Figure 53 The image shows the distortion curve when the zoom lens is at the telephoto end in Example 6. The wavelength of the light in the figure is 587.6 nm.

[0300] according to Figures 48 to 53 It can be seen that the zoom lens given in Example 6 has good image quality at both the wide-angle and telephoto ends.

[0301] 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 includes: a first lens group and a second lens group arranged from the object side to the image side; the first lens group has a negative optical power, and the second lens group has a positive optical power; the zoom lens has a telephoto end and a wide-angle end, and both the first lens group and the second lens group can move along the optical axis direction to perform zoom switching between the telephoto end and the wide-angle end; the number of critical points of at least one lens in the zoom lens is greater than or equal to 2; the wide-angle end of the zoom lens satisfies the relation: 2.5 < TTLw / ImgH < 4; where TTLw is the overall optical length of the zoom lens at the wide-angle end, ImgH is the image height, and the zoom lens satisfies the relation: 0.05 < Δd / TTLw < 0.25, where Δd is the distance that the second lens group moves during the zoom process of the zoom lens from the wide-angle end to the telephoto end.

2. The zoom lens according to claim 1, wherein The zoom lens further has a retracted state, and when the zoom lens is in the retracted state, it satisfies the relation: cTTL < TTLw and cTTL < TTLt, where cTTL is the overall optical length of the zoom lens in the retracted state, and TTLt is the overall optical length of the zoom lens at the telephoto end.

3. The zoom lens according to claim 2, wherein The retracted state of the zoom lens satisfies the relation: 1 < cTTL / ImgH < 2.

4. The zoom lens according to claim 2, wherein During the process of the zoom lens switching from the retracted state to the telephoto end, the first lens group and the second lens group move along the optical axis toward the object side.

5. 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 first lens group moves along the optical axis toward the image side, and the second lens group moves along the optical axis toward the object side.

6. The zoom lens as described in claim 1, characterized in that, The zoom lens further includes an aperture, and the aperture is disposed on the object side of the second lens group or inside the second lens group. During the zoom process of the zoom lens, the aperture and the second lens group move synchronously.

7. The zoom lens as described in claim 1, characterized in that, The zoom lens further includes a third lens group having a negative optical power, and the third lens group is fixedly disposed on the image side of the second lens group.

8. The zoom lens as described in claim 7, characterized in that, The total number of lenses in the third lens group is 1 - 2.

9. The zoom lens as described in any one of claims 1-8, characterized in that, The total number of lenses in the first lens group is 2 - 3; and / or, the total number of lenses in the second lens group is 3 - 5.

10. The zoom lens as described in any one of claims 1-8, characterized in that, The zoom lens satisfies the relation: 1 < fw / ImgH < 1.7, where fw is the focal length at the wide-angle end.

11. The zoom lens as described in any one of claims 1-8, characterized in that, The zoom lens satisfies the relation: -3 < f1 / f2 < -1.2, where f1 is the focal length of the first lens group and f2 is the focal length of the second lens group.

12. The zoom lens as described in any one of claims 1-8, characterized in that, The zoom lens satisfies the relation: 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.

13. The zoom lens as described in any one of claims 1-8, characterized in that, The zoom lens satisfies the relation ft / ENPt < 3, where ft is the focal length at the telephoto end, and ENPt is the entrance pupil diameter of the zoom lens at the telephoto end.

14. The zoom lens as described in any one of claims 1-8, characterized in that, The lens on the object side of the first lens group has negative optical power, and / or the lens on the object side of the second lens group has positive optical power.

15. The zoom lens as described in any one of claims 1-8, characterized in that, The total number of lenses N in the zoom lens satisfies: 5≤N≤10.

16. A camera module, characterized in that, The camera module includes a filter, a photosensitive element, and a zoom lens as described in any one of claims 1-15. The zoom lens, filter, and photosensitive element are arranged sequentially along the optical axis, and the first lens group and the second lens group of the zoom lens can move relative to the photosensitive element along the optical axis.

17. An electronic device, characterized in that, The electronic device includes a device body and a camera module as described in claim 16. The device body has an opening, and the camera module is disposed in the device body corresponding to the opening. The zoom lens of the camera module can extend or retract into the device body through the opening in at least a portion.

Images