Lens module, camera module and electronic equipment

Abstract

The embodiment of the invention provides a lens module, a camera module and electronic equipment. The lens module comprises a first lens group and a second lens group which are sequentially arranged from an object side to an image side along an optical axis, the first lens group comprises a first lens and a reflection optical element, the second lens group comprises a second lens, the reflection optical element is arranged between the first lens and the second lens, and the reflection optical element is arranged between the first lens and the second lens. The reflection optical element is used for reflecting light from the first lens to the second lens, the optical axis comprises a first optical axis and a second optical axis, the first optical axis penetrates through the first lens, the second optical axis penetrates through the second lens, and the first optical axis and the second optical axis are arranged on the reflection optical element. The second lens can move in the direction perpendicular to the second optical axis so as to prevent shake. The lens module provided by the invention has a good anti-shake effect.

Description

Lens modules, camera modules and electronic equipment Technical Field

[0001] The present application relates to the field of optical imaging technology, and in particular to a lens module, a camera module and an electronic device. Background Art

[0002] With the rapid development of smartphones in recent years, consumers have increasingly demanded higher camera performance. For example, the inclusion of telephoto lens modules has become a trend. However, telephoto lens modules have a narrower field of view and are more sensitive to camera shake during shooting.

[0003] Summary of the Invention

[0004] The present application provides a lens module, a camera module and an electronic device with good anti-shake effect.

[0005] In a first aspect, the present application provides a lens module, which includes: a first lens group and a second lens group arranged in sequence along the optical axis from the object side to the image side, the first lens group includes a first lens and a reflective optical element, and the second lens group includes a second lens, wherein the reflective optical element is arranged between the first lens and the second lens, and the reflective optical element is used to reflect light from the first lens to the second lens, the optical axis includes a first optical axis and a second optical axis, the first optical axis passes through the first lens, and the second optical axis passes through the second lens, and the second lens can move in a direction perpendicular to the second optical axis for anti-shake.

[0006] In a second aspect, the present application further provides a camera module, which includes an image sensor and the above-mentioned lens module, and the image sensor is used to receive light from the lens module.

[0007] In a third aspect, the present application further provides an electronic device, which includes a device body and the above-mentioned camera module, and the camera module is installed on the device body.

[0008] In the lens module provided in the present application, a first lens group and a second lens group are arranged in sequence from the object side to the image side along the optical axis. The first lens group includes a first lens and a reflective optical element, and the second lens group includes a second lens. The first lens and the second lens are respectively located on the object side and the image side of the reflective optical element. Among them, the reflective optical element can change the propagation path of light and bend the light path. When the lens module is applied to a camera module and installed in an electronic device, the length direction of the camera module can be consistent with the length direction or width direction of the electronic device, so that it will not affect the thickness design of the electronic device, that is, it is conducive to making the electronic device thinner. Secondly, the first lens has a positive optical power, which means that the first lens can shrink the light beam, so that the diameter of the light beam entering each lens located behind the image side of the first lens is smaller, and the size can be made smaller, thereby reducing the overall thickness of the lens module. In addition, the second lens can move in a direction perpendicular to the second optical axis, thereby achieving an anti-shake function. During the design process, the material and focal length of the second lens can be appropriately configured to ensure the anti-shake correction capability of the lens module with a small amount of movement of the second lens. Furthermore, since only one second lens moves in a direction perpendicular to the second optical axis, it is small in size and light in weight, thereby achieving the effects of short anti-shake response time and high anti-shake accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0010] FIG1 is a schematic diagram of an electronic device provided in an embodiment of the present application;

[0011] FIG2 is a schematic diagram of the electronic device shown in FIG1 from another perspective;

[0012] FIG3 is a schematic diagram of a camera module provided in one embodiment of the present application;

[0013] FIG4 is a schematic diagram of a lens module (fixed-focus lens) provided in Example 1 of the present application;

[0014] FIG5 is an astigmatism diagram of the lens module (fixed-focus lens) provided in Example 1;

[0015] FIG6 is a diagram of spherical aberration of the lens module (fixed-focus lens) provided in Example 1;

[0016] FIG7 is a distortion diagram of the lens module (fixed-focus lens) provided in Example 1;

[0017] FIG8 is a schematic diagram of a lens module (fixed-focus lens) provided in Example 2 of the present application;

[0018] FIG9 is an astigmatism diagram of the lens module (fixed-focus lens) in Example 2;

[0019] FIG10 is a diagram showing spherical aberration of the lens module (fixed-focus lens) in Example 2;

[0020] FIG11 is a distortion diagram of the lens module (fixed-focus lens) in Example 2;

[0021] FIG12 is a schematic diagram of a lens module (fixed-focus lens) provided in Example 3 of the present application;

[0022] FIG13 is an astigmatism diagram of the lens module (fixed-focus lens) in Example 3;

[0023] FIG14 is a diagram showing spherical aberration of the lens module (fixed-focus lens) in Example 3;

[0024] FIG15 is a distortion diagram of the lens module (fixed-focus lens) in Example 3;

[0025] FIG16 is a schematic diagram of a lens module (fixed-focus lens) provided in Example 4 of the present application;

[0026] FIG17 is an astigmatism diagram of the lens module (fixed-focus lens) in Example 4;

[0027] FIG18 is a diagram showing spherical aberration of the lens module (fixed-focus lens) in Example 4;

[0028] FIG19 is a distortion diagram of the lens module (fixed-focus lens) in Example 4;

[0029] FIG20 is a schematic diagram of the lens module (zoom lens) provided in Example 5 of the present application at the wide-angle end, the middle section, and the telephoto end;

[0030] FIG21 is an astigmatism diagram of the lens module (zoom lens) in Example 5 when it is at the wide-angle end;

[0031] FIG22 is a diagram showing spherical aberration of the lens module (zoom lens) in Example 5 when it is at the wide-angle end;

[0032] FIG23 is a distortion diagram of the lens module (zoom lens) in Example 5 when it is at the wide-angle end;

[0033] FIG24 is an astigmatism diagram of the lens module (zoom lens) in Example 5 when it is at the middle end;

[0034] FIG25 is a diagram showing spherical aberration when the lens module (zoom lens) in Example 5 is at the middle end;

[0035] FIG26 is a distortion diagram of the lens module (zoom lens) in Example 5 when it is at the middle end;

[0036] FIG27 is an astigmatism diagram of the lens module (zoom lens) in Example 5 when it is at the telephoto end;

[0037] FIG28 is a diagram showing spherical aberration when the lens module (zoom lens) in Example 5 is at the telephoto end;

[0038] FIG29 is a distortion diagram of the lens module (zoom lens) in Example 5 when it is at the telephoto end;

[0039] FIG30 is a schematic diagram of the lens module (zoom lens) provided in Example 6 of the present application at the wide-angle end, the middle section, and the telephoto end;

[0040] FIG31 is an astigmatism diagram of the lens module (zoom lens) in Example 6 when it is at the wide-angle end;

[0041] FIG32 is a diagram showing spherical aberration of the lens module (zoom lens) in Example 6 when it is at the wide-angle end;

[0042] FIG33 is a distortion diagram of the lens module (zoom lens) in Example 6 when it is at the wide-angle end;

[0043] FIG34 is an astigmatism diagram of the lens module (zoom lens) in Example 6 when it is at the middle end;

[0044] FIG35 is a diagram showing spherical aberration when the lens module (zoom lens) in Example 6 is at the middle end;

[0045] FIG36 is a distortion diagram of the lens module (zoom lens) in Example 6 when it is at the middle end;

[0046] FIG37 is an astigmatism diagram of the lens module (zoom lens) in Example 6 when it is at the telephoto end;

[0047] FIG38 is a diagram showing spherical aberration of the lens module (zoom lens) in Example 6 when it is at the telephoto end;

[0048] FIG39 is a distortion diagram of the lens module (zoom lens) in Example 6 when it is at the telephoto end;

[0049] FIG40 is a schematic diagram of the lens module (zoom lens) provided in Example 7 of the present application at the wide-angle end, the middle section, and the telephoto end;

[0050] FIG41 is an astigmatism diagram of the lens module (zoom lens) in Example 7 when it is at the wide-angle end;

[0051] FIG42 is a diagram showing spherical aberration of the lens module (zoom lens) in Example 7 when it is at the wide-angle end;

[0052] FIG43 is a distortion diagram of the lens module (zoom lens) in Example 7 when it is at the wide-angle end;

[0053] FIG44 is an astigmatism diagram of the lens module (zoom lens) in Example 7 when it is at the middle end;

[0054] FIG45 is a diagram showing spherical aberration when the lens module (zoom lens) in Example 7 is at the middle end;

[0055] FIG46 is a distortion diagram of the lens module (zoom lens) in Example 7 when it is at the middle end;

[0056] FIG47 is an astigmatism diagram of the lens module (zoom lens) in Example 7 when it is at the telephoto end;

[0057] FIG48 is a diagram showing spherical aberration of the lens module (zoom lens) in Example 7 when it is at the telephoto end;

[0058] FIG49 is a distortion diagram of the lens module (zoom lens) in Example 7 when it is at the telephoto end;

[0059] FIG50 is a schematic diagram of a camera module provided in a second embodiment of the present application;

[0060] Figure 51 is a schematic diagram of another camera module provided in the second embodiment of the present application.

[0061] Explanation of the accompanying figures: Electronic device 100; device body 10; camera module 20; display screen 110; middle frame 120; back cover 130; light-transmitting window K; lens module 210; filter 220; image sensor 230; anti-shake drive structure 240; driving member 241; force-bearing member 242; imaging surface S231; first lens group G1; second lens group G2; third lens group G3; fourth lens group G4; first optical axis Y1; second optical axis Y2; aperture 211; first lens L1; reflecting optical element X; second lens L2; ​​third lens L3; fourth lens L4; fifth lens L5; sixth lens L6; seventh lens L7. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0063] References herein to "embodiments" or "implementations" mean that a particular feature, structure, or characteristic described in connection with the embodiments or implementations may be included in at least one embodiment of the present application. The appearance of such phrases in various places in the specification does not necessarily refer to the same embodiment, nor do they constitute independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] When users use electronic devices to take photos, hand tremors are inevitable. If left uncorrected, these tremors will result in blurry images. To address this issue, anti-shake technology has emerged to eliminate the effects of hand tremors.

[0065] Currently, the image stabilization correction methods for periscope-structure telephoto lens modules in mobile phones released on the market are: 1. By rotating a triangular prism or reflector in front of the lens, these are large, heavy, and have low rotational precision, resulting in image lag and low image quality. 2. By moving the image sensor perpendicular to the optical axis, this method is not suitable for large-bottom image sensors (which are heavy and have limited motor drive capabilities).

[0066] Based on this, the present application hopes to provide a solution that can solve but is not limited to the above-mentioned technical problems, the details of which will be explained in the subsequent embodiments.

[0067] 1 and 2 , the present application provides an electronic device 100 , which includes a device body 10 and a camera module 20 . The camera module 20 is mounted on the device body 10 .

[0068] The electronic device 100 may be a mobile phone, a tablet computer, a laptop computer, a wearable device (such as a smart watch, a device, etc.), a television, an e-reader, etc. The following content of this application is only exemplified by taking the electronic device 100 as a mobile phone.

[0069] The device body 10 refers to the main part of the electronic device 100, which includes functional components that realize the main functions of the electronic device 100 and a mechanical structure that protects and supports these functional components.

[0070] Taking a mobile phone as an example (as shown in FIG2 ), the device body 10 includes a display screen 110, a middle frame 120, and a back cover 130. The display screen 110 and the back cover 130 are both connected to the middle frame 120 and are respectively arranged on opposite sides of the middle frame 120, and the side of the middle frame 120 is exposed outside the back cover 130 and the display screen 110. Any of the display screen 110, the middle frame 120, and the back cover 130 has a light-transmitting window K through which light can pass, and the camera module 20 is arranged facing the light-transmitting window K. The light-transmitting window K can be a transparent solid area, a through hole, or a combination of the two.

[0071] The camera module 20 can be a color camera that captures color images, or an infrared camera that captures monochrome images, etc., without limitation. The camera module 20 can be a periscope camera, the thickness of which is consistent with the thickness of the electronic device 100, which facilitates a thinner design of the electronic device 100. The length of the periscope camera can be consistent with the length of the electronic device 100, or it can be consistent with the width of the electronic device 100, or it can be arranged at an angle within the electronic device 100.

[0072] It should be noted that, depending on actual needs, the camera module 20 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 20 can be located on the front, back, or side of the mobile phone. The so-called front refers to the side of the mobile phone with the display 110; the so-called back refers to the side of the mobile phone with the battery cover; and the so-called side refers to the circumferential side of the middle frame 120 of the mobile phone. It is understandable that the definitions of the front, back, side, etc. may be different for different types of electronic devices 100, and other types of electronic devices 100 are not described in detail here.

[0073] Referring to FIG. 3 , the present application further provides a camera module 20 , which includes an image sensor 230 and a lens module 210 . The image sensor 230 is configured to receive light from the lens module 210 .

[0074] Specifically, the lens module 210 is used to collect light from the scene being photographed and focus the light on the image sensor 230, which then converts the light signal into an electrical signal. The lens module 210 includes multiple lenses, and the number of lenses can be, but is not limited to, 6, 7, 8, etc. The material of the lens can be, but is not limited to, transparent glass or transparent plastic. The image sensor 230 can also be referred to as a photosensitive chip, a photosensitive element, or a sensor. The image sensor 230 can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The image sensor 230 has an imaging surface S231, which is a target surface on the image sensor 230 that receives light.

[0075] The camera module 20 may also include a filter 220, which is disposed along the light path between the lens module 210 and the image sensor 230. The filter 220 is used to filter out unnecessary light to improve effective resolution and color reproduction. If the camera module 20 is a color camera, the filter 220 may be an infrared filter to filter out infrared light. If the camera module 20 is a monochrome camera (such as an infrared camera) that captures monochrome images, the filter 220 may be a visible light filter to filter out visible light.

[0076] It should be noted that the imaging surface S231 and the filter 220 involved in the following embodiments of the lens module 210 are used to assist in describing the lens module 210, and do not mean that the lens module 210 includes the image sensor 230 having the imaging surface S231 and the filter 220.

[0077] For ease of subsequent description, an XYZ spatial rectangular coordinate system is defined using the perspective shown in FIG3 . The X-axis is parallel to the length of the camera module 20 . The Z-axis is parallel to the height (i.e., thickness) of the camera module 20 . The Y-axis is parallel to the width of the camera module 20 .

[0078] Referring to FIG. 3 , the present application provides a lens module 210 having a periscope structure. The lens module 210 includes a first lens group G1 and a second lens group G2, arranged sequentially along the optical axis from the object side to the image side. The first lens group G1 includes a first lens L1 and a reflective optical element X. The second lens group G2 includes a second lens L2. The first lens L1 has positive optical power. The reflective optical element X is disposed between the first lens L1 and the second lens L2. The reflective optical element X is used to bend the optical path to reflect light from the first lens L1 toward the second lens L2, i.e., the first lens L1 is disposed on the object side of the reflective optical element X, and the second lens L2 is disposed on the image side of the reflective optical element X. The so-called object side and image side refer to the side of an optical component (e.g., a lens) or an optical system (e.g., a lens group) where the object is located and the image side where the image of the object is located. The following description of the object side and image side can be referred to herein.

[0079] The reflective optical element X can be a prism (as shown in FIG3 ) or a plane mirror. The reflective optical element X can be made of glass or plastic. It is understood that by changing the propagation path of the light through the reflective optical element X, the light path is bent, so that the length direction of the camera module 20 can be consistent with the length direction or width direction of the electronic device 100, which will not affect the thickness design of the electronic device 100, that is, it is conducive to making the electronic device 100 thinner.

[0080] The first lens L1 has positive optical power. The optical power (focal power) characterizes the ability of an optical component or optical system to deflect light. Generally speaking, the optical power is also the reciprocal of the image-side focal length. The optical power of an optical system is positive, which means that it has a converging effect on light. The optical power of an optical system is negative, which means that it has a diverging effect on light. Therefore, the first lens L1 has positive optical power, which means that the first lens L1 can shrink the light beam, so that the diameter of the light beam entering the reflective optical element X and the second lens group G2 is smaller, so that the size of the reflective optical element X and the second lens group G2 located on the image side of the first lens L1 can be made smaller, thereby reducing the overall thickness of the lens module 210 in the Z-axis direction. For example, the light beam range is smaller, and the radial dimension of the second lens group G2 in the Z-axis direction can be designed to be smaller.

[0081] Furthermore, the optical axis includes a first optical axis Y1 (the first optical axis Y1 is parallel to the Z axis) and a second optical axis Y2 (the second optical axis Y2 is parallel to the X axis). The first optical axis Y1 passes through the first lens L1, and the second optical axis Y2 passes through the second lens L2. The second lens L2 can move in a direction perpendicular to the second optical axis Y2 for anti-shake. Specifically, only one lens is provided in the second lens group G2, namely the second lens L2. By properly configuring the material and focal length of the second lens L2, the anti-shake correction capability of the lens module 210 can be ensured when the second lens L2 moves a small amount. In addition, since only one second lens L2 moves in a direction perpendicular to the second optical axis Y2, it is small in size and light in weight, thereby achieving the effect of short anti-shake reaction time and high anti-shake accuracy.

[0082] Optionally, the second lens L2 is made of plastic. Plastic has low density and light weight, and is easier to move in a direction perpendicular to the second optical axis Y2 for anti-shake, thereby achieving the effect of short anti-shake response time and high anti-shake accuracy.

[0083] It should be noted that the anti-shake motion direction of the second lens L2 can be any direction within a plane perpendicular to the X-axis. In other words, the anti-shake motion direction of the second lens L2 can be the Z-axis direction to achieve anti-shake in the Z-axis direction. The anti-shake motion direction of the second lens L2 can also be the Y-axis direction to achieve anti-shake in the Y-axis direction. The anti-shake motion direction of the second lens L2 can also be other directions inclined relative to the Y-axis and Z-axis to achieve anti-shake in that direction.

[0084] Furthermore, in addition to the first lens group G1 and the second lens group G2, the lens module 210 may further include at least one lens group. For example, the lens module 210 may further include a third lens group G3 and a fourth lens group G4. In this application, the lens module 210 is illustrated as including a total of four lens groups.

[0085] Optionally, the optical surface of at least one lens in the lens module 210 is aspherical. In other words, at least one lens in all the lenses constituting the lens group is an aspherical lens. The use of an aspherical shape is beneficial for correcting aberrations, resulting in better imaging effects.

[0086] Optionally, the total number N of lenses in the lens module 210 satisfies: 5≤N≤9. That is, the sum of the number of lenses in all lens groups N is greater than or equal to 5 and less than or equal to 9. The total number of lenses N can be 5, or 6, or 7, or 8, or 9. It should be noted that the lens mentioned in this embodiment does not include a reflective optical element X. If the number of lenses is too small (i.e., N<5), the aberration cannot be completely corrected. If the number of lenses is too large (i.e., N>9), the lens module 210 will be too large and will not be suitable for application in electronic devices 100 with thin and light requirements. This embodiment takes into account both imaging quality and size and selects the total number of lenses within the range of 5 to 9, thereby ensuring that the lens module 210 has a good imaging effect while achieving the beneficial effects of miniaturization and light weight of the lens module 210.

[0087] Optionally, at least one lens in the lens module 210 is made of plastic. Compared with glass, plastic is lighter and more suitable for electronic devices 100 that require thinness and lightness.

[0088] In summary, in the lens module 210 provided in the present application, a first lens group G1 and a second lens group G2 are arranged in sequence along the optical axis from the object side to the image side. The first lens group G1 includes a first lens L1 and a reflective optical element X, and the second lens group G2 includes a second lens L2. The first lens L1 and the second lens L2 are located on the object side and image side of the reflective optical element X, respectively. Among them, the reflective optical element X can change the propagation path of light and bend the light path. When the lens module 210 is applied to the camera module 20 and installed in the electronic device 100, the length direction of the camera module 20 can be consistent with the length direction or width direction of the electronic device 100. This will not affect the thickness design of the electronic device 100, that is, it is conducive to making the electronic device 100 thinner. Secondly, the first lens L1 has a positive optical power, which means that the first lens L1 can shrink the light beam, so that the diameter of the light beam entering the various lenses located behind the image side of the first lens L1 is smaller, and the size can be made smaller, thereby reducing the overall thickness of the lens module 210. Furthermore, the second lens L2 can move perpendicularly to the second optical axis Y2, thereby achieving an anti-shake function. During the design process, by appropriately configuring the material and focal length of the second lens L2, the anti-shake correction capability of the lens module 210 can be maintained with minimal movement of the second lens L2. Furthermore, since only one second lens L2 moves perpendicularly to the second optical axis Y2, the lens module 210 is compact and lightweight, achieving a short anti-shake response time and high anti-shake accuracy.

[0089] Please refer to FIG. 3. The lens module 210 further includes a third lens group G3 and a fourth lens group G4. The fourth lens group G4 is disposed on the image side of the second lens group G2. The third lens group G3 is disposed between the second lens group G2 and the fourth lens group G4. For the lens module 210 including the third lens group G3 and the fourth lens group G4, in this application, a fixed-focus lens and the lens module 210 are taken as examples respectively for illustration. Both the fixed-focus lens and the lens module 210 are telephoto lenses. For the fixed-focus lens, when the object to be photographed is at infinity, the focal length of the lens module 210 does not change. Of course, the fixed-focus lens does not mean that the third lens group G3 and the fourth lens group G4 are fixed. When using the fixed-focus lens for shooting, focusing can be achieved by driving any one of the third lens group G3 and the fourth lens group G4 to move. For the lens module 210, when the object to be photographed is at infinity, the focal length is variable, and the change in the focal length can be achieved by driving the third lens group G3 and the fourth lens group G4 to move. The following is an exemplary introduction in two parts: the fixed-focus lens and the lens module 210.

[0090] The content of the fixed-focus lens is introduced in detail below. The fixed-focus lens includes FIGS. 4 to 19 and the corresponding text content of these figures.

[0091] Please refer to FIG. 4. The first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 together constitute a fixed-focus lens. In this fixed-focus lens, the first lens L1 has a positive optical power, so that the light beam can be contracted, making the diameter of the light beam entering the second lens L2 smaller. The second lens L2 has a negative optical power. When the second lens L2 moves in the direction perpendicular to the second optical axis Y2 for anti-shake, the deterioration of the imaging performance can be relatively small. The third lens group G3 includes a third lens L3, and the third lens L3 has a positive optical power, so that the light beam can be contracted, making the diameter of the light beam entering the rear lens smaller. The fixed-focus lens provided in this embodiment can be made shorter in the X-axis direction compared with the lens module 210, and is more suitable for electronic devices 100 with requirements for being thin, light, and miniaturized, such as mobile phones.

[0092] Please refer to FIG. 4. The lens module 210 further includes an aperture 211, and the aperture 211 is located on the object side or the image side of the third lens group G3. In this way, the aperture adjustment effect of the aperture 211 is better, and the imaging quality can be improved.

[0093] Optionally, the lens module 210 satisfies the following relationship: -1.0 < fL2 / fz < -0.4, where fL2 is the focal length of the second lens L2, and fz is the overall focal length of the lens module 210.

[0094] Among them, the ratio of fL2 to fz (i.e., the focal length ratio of the second lens and the lens module 210), fL2 / fz, can be but is not limited to -0.99, -0.95, -0.90, -0.86, -0.83, -0.8, -0.78, -0.72, -0.70, -0.66, -0.65, -0.60, -0.57, -0.55, -0.50, -0.49, -0.46, -0.45, etc.

[0095] In this embodiment, if fL2 / fz is too small (i.e., fL2 / fz is less than or equal to -1.0), the movement amount of the second lens in the direction perpendicular to the second optical axis Y2 during anti-shake movement will increase, and further the thickness of the lens module 210 in the Z-axis direction will increase. If fL2 / fz is too large (i.e., fL2 / fz is greater than or equal to -4.0), when the second lens moves in the direction perpendicular to the second optical axis Y2 for anti-shake, the imaging performance deteriorates greatly.

[0096] Optionally, the lens module 210 satisfies the following relationship: Vd2 > 50, where Vd2 is the Abbe number of the material of the second lens L2.

[0097] Among them, Vd2 can be but is not limited to 51, 61, 62, 66, 67, 68, 69, 70, 71, 75, 76, 77, 78, 80, 81, 82, 83, 85, 86, 87, 88, 89, 90, etc.

[0098] In this embodiment, setting Vd2 to be greater than 50 can make the chromatic aberration change less when the second lens L2 moves in the direction perpendicular to the second optical axis Y2 for anti-shake.

[0099] Optionally, the lens module 210 satisfies the following relationship: Nd1 > 1.8, where Nd1 is the refractive index of the material of the first lens L1.

[0100] Among them, Nd1 can be but is not limited to 1.9, 2.0, 2.1, 2.2, 2.3, 2.5, 2.8, 3.0, 3.1, 3.3, 3.5, 3.9, 4.0, 4.1, 4.5, 4.9, 5.0, etc.

[0101] In this embodiment, setting Nd1 to be greater than 1.8 can increase the beam contraction ability of the first lens L1, make the beam diameter entering the second lens L2 smaller, effectively increase the light transmission aperture, and achieve a large aperture (small f-number value).

[0102] Optionally, the lens module 210 satisfies the following relationship: 1.2 < fL1 / fz < 2.5, where fL1 is the focal length of the first lens L1, and fz is the overall focal length of the lens module 210.

[0103] Among them, fL1 / fz (the ratio of fL1 to fz, that is, the focal length ratio of the first lens L1 and the lens module 210) can be but is not limited to 1.3, 1.4, 1.5, 1.6, 1.65, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.25, 2.3, 2.4, etc.

[0104] In this embodiment, if fL1 / fz is too large (i.e., fL1 / fz is greater than 2.5), the first lens L1 will have poor light beam contraction capability. If fL1 / fz is too small (i.e., fL1 / fz is less than 1.2), the first lens L1 will be disadvantageous in correcting aberrations.

[0105] Optionally, the lens module 210 satisfies the following relationship: R1 / fL1<1.2, where fL1 is the focal length of the first lens L1, and R1 is the radius of curvature of the object-side surface of the first lens L1. The so-called object-side surface refers to the surface on the side of the optical component (e.g., lens) or optical system (e.g., lens group) where the object is located, with the optical component (e.g., lens) or optical system (e.g., lens group) as the boundary. The object-side surface of the first lens L1 is the surface of the first lens L1 facing away from the reflective optical element X.

[0106] Among them, R1 / fL1 (the ratio of R1 to fL1) can be but is not limited to 1.19, 1.16, 1.12, 1.1, 1.09, 1.06, 1.01, 0.96, 0.95, 0.88, 0.82, 0.75, 0.71, 0.62, 0.63, 0.5, etc.

[0107] In this embodiment, if R1 / fL1 is too large (ie, R1 / fL1 is greater than or equal to 1.2), it will be detrimental to the aberration correction of the first lens L1.

[0108] Optionally, the lens module 210 satisfies the following relationship: TTL / fz<1.3, wherein fz is the overall focal length of the lens module 210, and TTL is the distance between the reflective optical element X and the imaging surface S231.

[0109] Among them, TTL / fz (the ratio of TTL to fz) can be but is not limited to 1.29, 1.26, 1.25, 1.22, 1.19, 1.16, 1.12, 1.1, 1.09, 1.06, 1.01, 0.96, 0.95, 0.88, 0.82, 0.75, 0.71, 0.62, 0.63, 0.5, etc.

[0110] In this embodiment, when TTL / fz is set within a range less than 1.3, the overall length of the lens module 210 in the X-axis direction can be ensured to be shorter, making it more suitable for electronic devices 100 with requirements for thinning and miniaturization, such as mobile phones.

[0111] Optionally, the third lens group G3 includes a third lens L3, and the lens module 210 satisfies the following relationship: 0.2 < fL3 / fz < 0.6, where fL3 is the focal length of the third lens L3, and fz is the overall focal length of the lens module 210.

[0112] Among them, fL3 / fz (the ratio of fL3 to fz, that is, the focal length ratio of the third lens L3 and the lens module 210) can be but not limited to 0.21, 0.25, 0.28, 0.31, 0.32, 0.36, 0.38, 0.42, 0.45, 0.49, 0.51, 0.55, 0.58, etc.

[0113] In this embodiment, if fL3 / fz is too large (that is, fL3 / fz is greater than or equal to 0.6), the ability of the third lens L3 to contract the light beam will be poor. If fL3 / fz is too small (that is, fL3 / fz is less than or equal to 0.2), it is not conducive to the third lens L3 to correct aberrations.

[0114] Optionally, the third lens group G3 includes a third lens L3, and the lens module 210 satisfies the following relationship: Vd3 > 50, where Vd3 is the Abbe number of the material of the third lens L3.

[0115] Among them, Vd3 can be but not limited to 51, 61, 62, 66, 67, 68, 69, 70, 71, 75, 76, 77, 78, 80, 81, 82, 83, 85, 86, 87, 88, 89, 90, etc.

[0116] In this embodiment, setting Vd3 to be greater than 50 enables the third lens L3 to well correct the chromatic aberration of the lens module 210.

[0117] Optionally, the lens module 210 satisfies the following relationship: fz / EPDz < 2.8, where fz is the overall focal length of the lens module 210, and EPDz is the entrance pupil diameter of the lens module 210, which can also be called the incident pupil diameter.

[0118] Among them, fz / EPDz (the ratio of fz to EPDz) can be but is not limited to 2.7, 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.

[0119] In this embodiment, fz / EPDz represents the f-number (or aperture number) of the lens module 210. By setting fz / EPDz to less than 2.8, the lens module 210 has a large aperture, thereby improving the brightness and blurring effect of the lens module 210. The higher the brightness of the lens module 210, the more light enters the lens module 210, which means clear images can be achieved even at night.

[0120] Optionally, the lens module 210 satisfies the following relationship: TTL / IMGH<3.8, wherein IMGH is the half image height of the image sensor 230, that is, half of the diagonal length of the effective pixel area of ​​the imaging surface S231, and TTL is the distance between the reflective optical element X and the imaging surface S231 of the image sensor 230.

[0121] Among them, TTL / IMGH (the ratio of TTL to IMGH) can be but is not limited to 1.9, 2.0, 2.1, 2.2, 2.3, 2.33, 2.5, 2.7, 2.8, 2.81, 2.9, 3.0, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, etc.

[0122] In this embodiment, setting TTL / IMGH to less than 3.8 can ensure that the total length of the lens module 210 in the X-axis direction is shorter, so that it is more suitable for electronic devices 100 with requirements for lightness, thinness and miniaturization, such as mobile phones.

[0123] The fixed-focus lens described above can achieve anti-shake by moving the second lens L2 to improve image quality. Moreover, this fixed-focus lens has a compact structure and small size, which can meet the thickness requirements of electronic devices 100 (such as mobile phones) that require lightweight and miniaturization.

[0124] The lens module 210 (fixed focus lens) is further described below through four specific embodiments (Examples 1 to 4). In the following embodiments, the surface type of each lens is aspherical, and the calculation formula for each aspherical surface is:

[0125] Where x is the distance vector from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in the following table); k is the conic coefficient (see table); Ai is the i-th order aspheric coefficient (see table).

[0126] Example 1

[0127] Referring to Figure 4 , the lens module 210 (fixed-focus lens) provided in this embodiment includes: a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4, arranged sequentially from the object side to the image side. The first lens group G1 includes a first lens L1 and a reflective optical element X. The second lens group G2 includes a second lens L2. The third lens group G3 includes a third lens L3. The fourth lens group G4 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The lens module 210 also includes an aperture 211, which is disposed between the second lens L2 and the third lens L3.

[0128] In Example 1, the field of view (FOV) is 35.6°, the f-number (Fno) is 2.47, and the size of the image sensor 230 (Sensor Size) is 1 / 1.4 inches.

[0129] For detailed data of the lens module 210 provided in Example 1, please refer to Tables 1 to 3.

[0130] Table 1 shows the parameters of the lenses, aperture 211, filter 220, and image sensor 230 of the lens module 210 in Example 1, including the radius of curvature R, spacing D, refractive index Nd, Abbe number Vd, focal length, and focal length of the lens module 210. The units of the radius of curvature R and spacing D are both millimeters (mm). In Table 1, surface numbers 1 to 19 sequentially mark the surface of the object, the lenses, aperture 211, filter 220, and imaging surface S231 along the object-side to image-side direction. The object is denoted as OBJ, the aperture 211 as STO, and the imaging surface S231 as IMA.

[0131] It should be noted that the spacing D represents the distance D between the current surface and the next surface along the optical axis. For example, in Table 1, the spacing between surfaces 8 and 9 is 1.957, and the spacing between surfaces 13 and 14 is 1.850. Please refer to this for reference to spacing D later in this document.

[0132] Table 2 shows the k value and the i-th order aspheric coefficient Ai of the aspheric surface of each lens in Example 1. Table 2 includes Table 2a and Table 2b.

[0133] Table 3 shows the overall parameter data of the lens module 210 in Example 1.

[0134] Please refer to FIG. 5 to FIG. 7 , which show relevant curve diagrams of the lens module 210 in Example 1. FIG.

[0135] 5 is an astigmatism diagram of the lens module 210 in Example 1. In the diagram, the dotted line represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 555 nm.

[0136] 6 is a spherical aberration diagram of the lens module 210 in Example 1. In the diagram, the dotted line corresponds to a light wavelength of 650 nm, the solid line corresponds to a light wavelength of 555 nm, and the dashed line corresponds to a light wavelength of 470 nm.

[0137] FIG7 is a distortion diagram of the lens module 210 in Example 1. The corresponding light wavelength in the diagram is 555 nm.

[0138] It can be seen from FIG. 5 to FIG. 7 that the lens module 210 provided in Example 1 has good imaging quality.

[0139] Example 2

[0140] Referring to Figure 8 , the lens module 210 (fixed-focus lens) provided in this embodiment includes: a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4, arranged sequentially from the object side to the image side. The first lens group G1 includes a first lens L1 and a reflective optical element X. The second lens group G2 includes a second lens L2. The third lens group G3 includes a third lens L3. The fourth lens group G4 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The lens module 210 also includes an aperture 211, which is disposed between the second lens L2 and the third lens L3.

[0141] In Example 2, the field of view (FOV) is 36.2°, the f-number (Fno) is 2.47, and the size of the image sensor 230 (Sensor Size) is 1 / 1.4 inches.

[0142] For detailed data of the lens module 210 provided in Example 2, please refer to Tables 4 to 6.

[0143] Table 4 shows the parameters of the lenses, aperture 211, filter 220, and image sensor 230 of the lens module 210 in Example 2, including the radius of curvature R, spacing D, refractive index Nd, Abbe number Vd, focal length, and focal length of the lens module 210. The units of the radius of curvature R and spacing D are both millimeters (mm). In Table 4, surface numbers 1 to 19 sequentially mark the surfaces of the object, the lenses, aperture 211, filter 220, and imaging surface S231 along the object-to-image direction. The object is denoted as OBJ, the aperture 211 as STO, and the imaging surface S231 as IMA.

[0144] It should be noted that the interval D represents the interval distance D between the current surface and the next surface along the optical axis.

[0145] Table 5 shows the k value and the i-th order aspheric coefficient Ai of the aspheric mirror surface of each lens in Example 2. Table 5 includes Table 5a and Table 5b.

[0146] Table 6 shows the overall parameter data of the lens module 210 in Example 2.

[0147] Please refer to FIG. 9 to FIG. 11 , which show relevant curve diagrams of the lens module 210 in the second embodiment.

[0148] 9 is an astigmatism diagram of the lens module 210 in Example 2. In the diagram, the dotted line represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 555 nm.

[0149] 10 is a spherical aberration diagram of the lens module 210 in Example 2. In the diagram, the dotted line corresponds to a light wavelength of 650 nm, the solid line corresponds to a light wavelength of 555 nm, and the dashed line corresponds to a light wavelength of 470 nm.

[0150] FIG11 is a distortion diagram of the lens module 210 in Example 2. The corresponding light wavelength in the diagram is 555 nm.

[0151] It can be seen from FIG. 9 to FIG. 11 that the lens module 210 provided in Example 2 has good imaging quality.

[0152] Example 3

[0153] Referring to Figure 12 , the lens module 210 (fixed-focus lens) provided in this embodiment includes: a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4, arranged sequentially from the object side to the image side. The first lens group G1 includes a first lens L1 and a reflective optical element X. The second lens group G2 includes a second lens L2. The third lens group G3 includes a third lens L3. The fourth lens group G4 includes a fourth lens L4, a fifth lens L5, and a sixth lens L6. The lens module 210 also includes an aperture 211, which is disposed between the second lens L2 and the third lens L3.

[0154] In Example 3, the field of view (FOV) is 34.8°, the f-number (Fno) is 2.4, and the size of the image sensor 230 (Sensor Size) is 1 / 1.4 inches.

[0155] For specific data of the lens module 210 provided in Example 3, please refer to Tables 7 to 9.

[0156] Table 7 shows the parameters of the lenses, aperture 211, filter 220, and image sensor 230 of the lens module 210 in Example 3, including the radius of curvature R, spacing D, refractive index Nd, Abbe number Vd, focal length, and focal length of the lens module 210. The units of the radius of curvature R and spacing D are both millimeters (mm). In Table 7, surface numbers 1 to 17 indicate the surfaces of the object, the lenses, aperture 211, filter 220, and imaging surface S231, in order from the object side to the image side. The object is denoted as OBJ, the aperture 211 as STO, and the imaging surface S231 as IMA.

[0157] It should be noted that the interval D represents the interval distance D between the current surface and the next surface along the optical axis.

[0158] Table 8 shows the k value and the i-th order aspheric coefficient Ai of the aspheric mirror surface of each lens in Example 3. Table 8 includes Table 8a and Table 8b.

[0159] Table 9 shows the overall parameter data of the lens module 210 in Example 3.

[0160] Please refer to FIG. 13 to FIG. 15 , which show relevant curve diagrams of the lens module 210 in Example 3.

[0161] FIG13 is an astigmatism diagram of the lens module 210 in Example 3. In the figure, the dotted line represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 555 nm.

[0162] 14 is a spherical aberration diagram of the lens module 210 in Example 3. In the diagram, the dotted line corresponds to a light wavelength of 650 nm, the solid line corresponds to a light wavelength of 555 nm, and the dashed line corresponds to a light wavelength of 470 nm.

[0163] FIG15 is a distortion diagram of the lens module 210 in Example 3. The corresponding light wavelength in the diagram is 555 nm.

[0164] It can be seen from FIG. 13 to FIG. 15 that the lens module 210 provided in Example 3 has good imaging quality.

[0165] Example 4

[0166] Referring to Figure 16 , the lens module 210 (fixed-focus lens) provided in this embodiment includes: a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4, arranged sequentially from the object side to the image side. The first lens group G1 includes a first lens L1 and a reflective optical element X. The second lens group G2 includes a second lens L2. The third lens group G3 includes a third lens L3. The fourth lens group G4 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The lens module 210 also includes an aperture 211, which is disposed between the second lens L2 and the third lens L3.

[0167] In Example 4, the field of view (FOV) is 35.6°, the f-number (Fno) is 2.47, and the size of the image sensor 230 (Sensor Size) is 1 / 1.4 inches.

[0168] For specific data of the lens module 210 provided in Example 4, please refer to Tables 10 to 12.

[0169] Table 10 shows the parameters of the lenses, aperture 211, filter 220, and image sensor 230 of the lens module 210 in Example 4, including the radius of curvature R, spacing D, refractive index Nd, Abbe number Vd, focal length, and focal length of the lens module 210. The units of the radius of curvature R, spacing D, focal length, and focal length of the lens module 210 are all in millimeters (mm). In Table 10, surface numbers 1 to 19 are sequentially labeled along the object side to image side, marking the surfaces of the object, the lenses, aperture 211, filter 220, and imaging surface S231. The object is denoted as OBJ, the aperture 211 as STO, and the imaging surface S231 as IMA.

[0170] It should be noted that the interval D represents the interval distance D between the current surface and the next surface along the optical axis.

[0171] Table 11 shows the k value and the i-th order aspheric coefficient Ai of the aspheric mirror surface of each lens in Example 4. Table 11 includes Table 11a and Table 11b.

[0172] Table 12 shows the overall parameter data of the lens module 210 in Example 4.

[0173] Please refer to FIG. 17 to FIG. 19 , which show relevant curve diagrams of the lens module 210 in Example 4.

[0174] FIG17 is an astigmatism diagram of the lens module 210 in Example 4. In the figure, the dotted line represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 555 nm.

[0175] 18 is a spherical aberration diagram of the lens module 210 in Example 4. In the figure, the dotted line corresponds to a light wavelength of 650 nm, the solid line corresponds to a light wavelength of 555 nm, and the dashed line corresponds to a light wavelength of 470 nm.

[0176] FIG19 is a distortion diagram of the lens module 210 in Example 4. The corresponding light wavelength in the diagram is 555 nm.

[0177] It can be seen from FIG. 17 to FIG. 19 that the lens module 210 provided in Example 4 has good imaging quality.

[0178] The following is a detailed introduction to the zoom lens, which includes Figures 20 to 49 and the text content corresponding to these figures.

[0179] Referring to Figure 20 , the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 together constitute a lens module 210. In this lens module 210, the first lens group G1 has positive optical power and is fixed during zooming. The first lens group G1 with positive optical power can shrink the light beam, making the diameter of the light beam entering the second lens group G2 smaller. The second lens group G2 has negative optical power and is fixed in the direction of the second optical axis Y2 during zooming. The second lens group G2 can move in a direction perpendicular to the second optical axis Y2 to achieve anti-shake. When the second lens group G2 performs anti-shake movement, the imaging performance deteriorates minimally. The third lens group G3 can have positive optical power. The lens closest to the object side of the third lens group G3 has positive optical power. The lens with positive optical power can shrink the light beam, making the diameter of the light beam entering the rear lens smaller. The fourth lens group G4 can have negative optical power.

[0180] The lens module 210 has a wide-angle end (as shown in FIG. 20 (a)) and a telephoto end (as shown in FIG. 20 (c)). The third lens group G3 and the fourth lens group G4 can be moved along the second optical axis Y2 so that the lens module 210 can switch zoom between the wide-angle end and the telephoto end to achieve continuous zoom. Therefore, the third lens group G3 and the fourth lens group G4 can also be called zoom lens groups.

[0181] The wide-angle and telephoto ends are two different shooting states of the lens module 210. The telephoto end refers to the state when the focal length of the lens module 210 is at its maximum, also known as the telephoto state. The wide-angle end refers to the state when the focal length of the lens module 210 is at its minimum, also known as the wide-angle state. In relative terms, the wide-angle end is also known as the short-focus state, while the telephoto end is also known as the long-focus state.

[0182] The two states of the lens module 210 are achieved by changing the positions of the third lens group G3 and the fourth lens group G4. That is, the positions of the third lens group G3 and the fourth lens group G4 when the lens module 210 is at the wide-angle end are different from the positions of the third lens group G3 and the fourth lens group G4 when the lens module 210 is at the telephoto end. Specifically, during the zooming process of the lens module 210 switching from the wide-angle end to the telephoto end, the third lens group G3 moves toward the object side along the second optical axis Y2, and the fourth lens group G4 moves toward the object side along the second optical axis Y2.

[0183] Referring to FIG. 20 , the lens module 210 may also have an intermediate end (as shown in FIG. 20( b )). The intermediate end is a shooting state between the wide-angle end and the telephoto end, and may also be referred to as an intermediate state. When the lens module 210 is at the intermediate end, the positions of the third lens group G3 and the fourth lens group G4 are different from the positions of the third lens group G3 and the fourth lens group G4 at the wide-angle end and the telephoto end.

[0184] The lens module 210 (lens module 210) provided in this embodiment is equivalent to integrating multiple lenses of different focal lengths. As the lens module 210 switches between the telephoto, intermediate, and wide-angle positions, it maintains continuous optical zoom. This ensures that the lens module 210 consistently produces high-quality images without degradation. Furthermore, the integration of the lenses reduces the overall size of the camera module 20, lowering costs and enabling the use of a large-format image sensor 230, thereby improving image quality (e.g., achieving high-pixel capture and reducing the signal-to-noise ratio).

[0185] Please refer to FIG. 20. The lens module 210 further includes an aperture 211. The aperture 211 is located on the object side of the third lens group G3 or inside the third lens group G3. That is to say, the aperture 211 can be disposed on the side of the third lens group G3 close to the second lens group G2, or can be disposed between two adjacent lenses in the third lens group G3. During the zooming process of the lens module 210, the aperture 211 and the third lens group G3 move together. In other words, the aperture 211 and the third lens group G3 are relatively fixed. The so-called relative fixation means that the aperture 211 and the third lens group G3 move synchronously together. The aperture 211 can be fixed on the third lens group G3 or on other components, which is not limited herein. In this embodiment, fixing the aperture 211 and the third lens group G3 relatively can make the aperture adjustment effect of the aperture 211 better and improve the imaging quality.

[0186] Optionally, the lens module 210 satisfies the following relationship: -1.0 < fg2 / fz1 < -0.4, where fg2 is the focal length of the second lens group G2, and fz1 is the focal length of the lens module 210 at the wide-angle end.

[0187] Among them, fg2 / fz1 (the ratio of fg2 to fz1, that is, the focal length ratio of the second lens group G2 and the wide-angle end) can be but not limited to -0.99, -0.95, -0.90, -0.86, -0.83, -0.8, -0.78, -0.72, -0.70, -0.66, -0.65, -0.60, -0.57, -0.55, -0.50, -0.49, -0.46, -0.45, -0.41, etc.

[0188] In this embodiment, if fg2 / fz1 is too large (that is, fg2 / fz1 is greater than or equal to -0.4), when the second lens group G2 moves in the direction perpendicular to the second optical axis Y2 for anti-shake, the imaging performance deteriorates greatly. If fg2 / fz1 is too small (that is, fg2 / fz1 is less than or equal to -1.0), the moving amount of the second lens group G2 in the direction perpendicular to the second optical axis Y2 during anti-shake will increase, and thus the thickness of the lens module 210 will increase.

[0189] Optionally, the lens module 210 satisfies the following relationship: Vd2 > 50, where Vd2 is the Abbe number of the material of the second lens L2.

[0190] Among them, Vd2 can be but not limited to 51, 61, 62, 66, 67, 68, 69, 70, 71, 75, 76, 77, 78, 80, 81, 82, 83, 85, 86, 87, 88, 89, 90, etc.

[0191] In this embodiment, setting Vd2 to be greater than 50 can make the chromatic aberration change less when the second lens L2 moves in the direction perpendicular to the second optical axis Y2 for anti-shake.

[0192] Optionally, the lens module 210 satisfies the following relationship: Nd1 > 1.8, where Nd1 is the refractive index of the material of the first lens L1.

[0193] Among them, Nd1 can be but not limited to 1.9, 2.0, 2.1, 2.2, 2.3, 2.5, 2.8, 3.0, 3.1, 3.3, 3.5, 3.9, 4.0, 4.1, 4.5, 4.9, 5.0, etc.

[0194] In this embodiment, setting Nd1 to be greater than 1.8 can increase the beam contraction ability of the first lens L1, making the beam diameter entering the second lens L2 smaller, effectively increasing the light transmission aperture, and achieving a large aperture (small f-number value).

[0195] Optionally, the lens module 210 satisfies the following relationship: TTL / fz3 < 1.1, where fz3 is the focal length of the lens module 210 at the telephoto end, and TTL is the distance between the reflection optical element X and the imaging surface S231 of the image sensor 230.

[0196] Among them, the ratio of TTL / fz3 (the ratio of TTL to fz3) can be but not limited to 1.09, 1.06, 1.01, 0.96, 0.95, 0.88, 0.82, 0.75, 0.71, 0.62, 0.63, 0.5, etc.

[0197] In this embodiment, setting TTL / fz3 within the range less than 1.1 can ensure that the overall length of the lens module 210 in the X-axis direction is shorter, thus being more suitable for electronic devices 100 with requirements for thinness, lightness, and miniaturization, such as mobile phones.

[0198] Optionally, the lens module 210 satisfies the following relationship: 1.2 < fL1 / fz1 < 2.5, where fL1 is the focal length of the first lens L1, and fz1 is the focal length of the lens module 210 at the wide-angle end.

[0199] Among them, the ratio of fL1 / fz1 (the ratio of fL1 to fz1, that is, the focal length ratio of the first lens L1 and the wide-angle end) can be but not limited to 1.21, 1.25, 1.28, 1.31, 1.32, 10.42, 1.45, 1.51, 1.55, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.35, 2.41, 2.46, 2.49, etc.

[0200] In this embodiment, if fL1 / fz1 is too large (i.e., fL1 / fz1 is greater than or equal to 2.5), the ability of the first lens L1 to contract the light beam is poor. If fL1 / fz1 is too small (i.e., fL1 / fz1 is less than or equal to 1.2), it is not conducive to the first lens L1 correcting aberrations.

[0201] Optionally, the third lens group G3 includes a third lens L3, and the lens module 210 satisfies the following relationship: 0.2 < fL3 / fz1 < 0.6, where fL3 is the focal length of the third lens L3, and fz1 is the focal length of the lens module 210 at the wide-angle end.

[0202] Among them, fL3 / fz1 (the ratio of fL3 to fz1, that is, the focal length ratio of the third lens L3 and the lens module 210) can be but not limited to 0.21, 0.25, 0.28, 0.31, 0.32, 0.36, 0.38, 0.42, 0.45, 0.49, 0.51, 0.55, 0.58, etc.

[0203] In this embodiment, if fL3 / fz1 is too large (i.e., fL3 / fz1 is greater than or equal to 0.6), the ability of the third lens L3 to contract the light beam is poor. If fL3 / fz1 is too small (i.e., fL3 / fz1 is less than or equal to 0.2), it is not conducive to the third lens L3 correcting aberrations.

[0204] Optionally, the third lens group G3 includes a third lens L3, and the lens module 210 satisfies the following relationship: Vd3 > 50, where Vd3 is the Abbe number of the material of the third lens L3.

[0205] Among them, Vd3 can be but not limited to 51, 61, 62, 66, 67, 68, 69, 70, 71, 75, 76, 77, 78, 80, 81, 82, 83, 85, 86, 87, 88, 89, 90, etc.

[0206] In this embodiment, setting Vd3 to be greater than 50 enables the third lens L3 to well correct the chromatic aberration of the lens module 210.

[0207] Optionally, the lens module 210 satisfies the following relationship: -1.0 < fg3 / fg4 < -0.5, where fg3 is the focal length of the third lens group G3, and fg4 is the focal length of the fourth lens group G4.

[0208] Among them, fg3 / fg4 (the ratio of fg3 to fg4) 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, -0.59, -0.55, and -0.51.

[0209] In this embodiment, by setting fg3 / fg4 to be greater than -1.0 and less than -0.5, the lens module 210 can have a macro shooting function.

[0210] Optionally, the lens module 210 satisfies the following relationship: fz1 / EPDz1<2.8, wherein fz1 is the focal length of the lens module 210 when it is at the wide-angle end, and EPDz1 is the entrance pupil diameter at the wide-angle end, which can also be called the entrance pupil diameter.

[0211] Among them, fz1 / EPDz1 (the ratio of fz1 to EPDz1) can be but is not limited to 2.7, 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.

[0212] In this embodiment, fz1 / EPDz1 represents the f-number (or aperture number) at the wide-angle end. By setting the ratio of the focal length fz1 at the wide-angle end to the entrance pupil diameter EPDz1 at the wide-angle end to be less than 2.8, a large aperture is achieved at the wide-angle end, thereby improving the brightness and blurring effect of the lens module 210. The increased brightness of the lens module 210 allows more light to enter the lens, which means clear images can be achieved even at night.

[0213] Optionally, the lens module 210 satisfies the following relationship: tan(hFOVw) / tan(hFOVt)>1.5, wherein hFOVw is the half field of view angle at the wide-angle end, and hFOVt is the half field of view angle at the telephoto end. The so-called half field of view angle is half of the field of view (FOV), and the half field of view angle can also be called half picture angle.

[0214] Among them, tan(hFOVw) / tan(hFOVt) (the ratio of tan(hFOVw) to 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.

[0215] In this embodiment, by setting the ratio of tan(hFOVw) to tan(hFOVt) to be greater than 1.5, the zoom ratio of the lens module 210 is greater than 1.5 times.

[0216] The lens module 210 (lens module 210) is further described below through three groups of specific embodiments (Examples 5 to 7). In the following embodiments, the surface type of each lens is aspherical, and the calculation formula for each aspherical surface is:

[0217] Where x is the distance vector from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in the following table); k is the conic coefficient (see table); Ai is the i-th order aspheric coefficient (see table).

[0218] Example 5

[0219] Please refer to Figure 20. Figure 20 (a) is a schematic diagram of the lens module 210 at the wide-angle end; Figure 20 (b) is a schematic diagram of the lens module 210 at the middle end; and Figure 20 (c) is a schematic diagram of the lens module 210 at the telephoto end. The lens module 210 (lens module 210) provided in this embodiment includes: a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4, arranged in sequence from the object side to the image side. The first lens group G1 includes a first lens L1 and a reflective optical element X. The second lens group G2 includes a second lens L2. The third lens group G3 includes a third lens L3, a fourth lens L4, and a fifth lens L5. The fourth lens group G4 includes a sixth lens L6 and a seventh lens L7. The lens module 210 also includes an aperture 211, which is disposed between the second lens L2 and the third lens L3.

[0220] In Example 5, the field of view (FOV) is 36.31° to 19.24°, the f-number (Fno) is 2.4 to 3.76, and the size of the image sensor 230 (Sensor Size) is 1 / 2 inch.

[0221] For specific data of the lens module 210 provided in Example 5, please refer to Tables 13 to 16.

[0222] Table 13 shows the parameters of the lenses, aperture 211, filter 220, and image sensor 230 of the lens module 210 in Example 5, including the radius of curvature R, spacing D, refractive index Nd, Abbe number Vd, focal length, and focal length of the lens module 210. The units of the radius of curvature R and spacing D are both millimeters (mm). In Table 13, surface numbers 1 to 21 sequentially mark the surfaces of the object, the lenses, aperture 211, filter 220, and imaging surface S231 along the object-to-image direction. The object is denoted as OBJ, the aperture 211 as STO, and the imaging surface S231 as IMA.

[0223] It should be noted that the spacing D represents the distance D between the current surface and the next surface along the optical axis. For example, in Table 13, the spacing between surfaces 8 and 9 is 2.152, and the spacing between surfaces 13 and 14 is DZ2. Please refer to this for reference to spacing D later in this document.

[0224] Table 14 shows the focal length EFL and variable interval D of the lens module 210 corresponding to when the lens module 210 is at the wide-angle end, the middle end, and the telephoto end in Example 5.

[0225] Table 15 shows the k value and the i-th order aspheric coefficient Ai of the aspheric mirror surface of each lens in Example 5. Table 15 includes Table 15a, Table 15b, Table 15c, and Table 15d.

[0226] Table 16 shows the overall parameter data of the lens module 210 in Example 5.

[0227] In this embodiment, the lens module 210 is switched between the wide-angle end, the middle end, and the telephoto end by changing the interval DZ1 between the second lens group G2 and the aperture 211 along the second optical axis Y2 (i.e., the interval distance between the image side surface of the second lens L2 and the object side surface of the aperture 211 along the second optical axis Y2), the interval DZ2 between the third lens group G3 and the fourth lens group G4 along the second optical axis Y2 (i.e., the interval distance between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 along the second optical axis Y2), and the interval DZ3 between the fourth lens group G4 and the filter 220 along the second optical axis Y2 (i.e., the interval distance between the image side surface of the seventh lens L7 and the object side surface of the filter 220 along the second optical axis Y2).

[0228] Please refer to FIG. 21 to FIG. 23 , which show relevant curve diagrams of the wide-angle end of the lens module 210 .

[0229] FIG21 is an astigmatism diagram of the lens module 210 at the wide-angle end in Example 5. In the figure, the dotted line represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 555 nm.

[0230] 22 is a spherical aberration diagram of the lens module 210 at the wide-angle end in Example 5. The dotted line in the figure corresponds to a light wavelength of 650 nm, the solid line corresponds to a light wavelength of 555 nm, and the dashed line corresponds to a light wavelength of 470 nm.

[0231] FIG23 is a distortion diagram of the lens module 210 at the wide-angle end in Example 5. The corresponding light wavelength in the diagram is 555 nm.

[0232] Please refer to FIG. 24 to FIG. 26 , which show relevant curve diagrams of the middle end of the lens module 210 .

[0233] FIG24 is an astigmatism diagram when the lens module 210 is at the middle end in Example 5. In the diagram, the dotted line represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 555 nm.

[0234] 25 is a spherical aberration diagram when the lens module 210 is at the middle end in Example 5. The dotted line in the figure corresponds to a light wavelength of 650 nm, the solid line corresponds to a light wavelength of 555 nm, and the dashed line corresponds to a light wavelength of 470 nm.

[0235] FIG26 is a distortion diagram when the lens module 210 is at the middle end in Example 5. The corresponding light wavelength in the diagram is 555 nm.

[0236] Please refer to FIG. 27 to FIG. 29 , which show relevant curve diagrams of the telephoto end of the lens module 210 .

[0237] FIG27 is an astigmatism diagram of the lens module 210 at the telephoto end in Example 5. In the diagram, the dotted line represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 555 nm.

[0238] Figure 28 is a spherical aberration diagram of the lens module 210 at the telephoto end in Example 5. The dotted line in the figure corresponds to a light wavelength of 650nm, the solid line corresponds to a light wavelength of 555nm, and the dashed line corresponds to a light wavelength of 470nm.

[0239] FIG29 is a distortion diagram of the lens module 210 at the telephoto end in Example 5. The corresponding light wavelength in the diagram is 555 nm.

[0240] It can be seen from FIG. 21 to FIG. 29 that the lens module 210 provided in Example 5 has good imaging quality at the wide-angle end, the middle end, and the telephoto end.

[0241] Example 6

[0242] Please refer to Figure 30. Figure 30 (a) is a schematic diagram of the lens module 210 at the wide-angle end; Figure 30 (b) is a schematic diagram of the lens module 210 at the middle end; and Figure 30 (c) is a schematic diagram of the lens module 210 at the telephoto end. The lens module 210 (lens module 210) provided in this embodiment includes: a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4, arranged in sequence from the object side to the image side. The first lens group G1 includes a first lens L1 and a reflective optical element X. The second lens group G2 includes a second lens L2. The third lens group G3 includes a third lens L3, a fourth lens L4, and a fifth lens L5. The fourth lens group G4 includes a sixth lens L6 and a seventh lens L7. The lens module 210 also includes an aperture 211, which is disposed between the second lens L2 and the third lens L3.

[0243] In Example 6, the field of view (FOV) is 35.85° to 18.84°, the f-number (Fno) is 2.64 to 4.23, and the size of the image sensor 230 (Sensor Size) is 1 / 1.4 inch.

[0244] For specific data of the lens module 210 provided in Example 6, please refer to Tables 17 to 20.

[0245] Table 17 shows the parameters of the lenses, aperture 211, filter 220, and image sensor 230 of the lens module 210 in Example 6, including the radius of curvature R, spacing D, refractive index Nd, Abbe number Vd, focal length, and focal length of the lens module 210. The units of the radius of curvature R and spacing D are both millimeters (mm). In Table 17, surface numbers 1 to 21 sequentially mark the surfaces of the object, the lenses, aperture 211, filter 220, and imaging surface S231 along the object-to-image direction. The object is denoted as OBJ, the aperture 211 as STO, and the imaging surface S231 as IMA.

[0246] It should be noted that the interval D represents the interval distance D between the current surface and the next surface along the optical axis.

[0247] Table 18 shows the focal length EFL and variable interval D of the lens module 210 corresponding to when the lens module 210 is at the wide-angle end, the middle end, and the telephoto end in Example 6.

[0248] Table 19 shows the k value and the i-th order aspheric coefficient Ai of the aspheric mirror surface of each lens in Example 6. Table 19 includes Table 19a, Table 19b, Table 19c, and Table 19d.

[0249] Table 20 shows the overall parameter data of the lens module 210 in Example 6.

[0250] In this embodiment, the lens module 210 is switched between the wide-angle end, the middle end, and the telephoto end by changing the interval DZ1 between the second lens group G2 and the aperture 211 along the second optical axis Y2 (i.e., the interval distance between the image side surface of the second lens L2 and the object side surface of the aperture 211 along the second optical axis Y2), the interval DZ2 between the third lens group G3 and the fourth lens group G4 along the second optical axis Y2 (i.e., the interval distance between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 along the second optical axis Y2), and the interval DZ3 between the fourth lens group G4 and the filter 220 along the second optical axis Y2 (i.e., the interval distance between the image side surface of the seventh lens L7 and the object side surface of the filter 220 along the second optical axis Y2).

[0251] Please refer to FIG. 31 to FIG. 33 , which show relevant curve diagrams of the wide-angle end of the lens module 210 .

[0252] FIG31 is an astigmatism diagram of the lens module 210 at the wide-angle end in Example 6. In the diagram, the dotted line represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 555 nm.

[0253] 32 is a spherical aberration diagram of the lens module 210 at the wide-angle end in Example 6. In the diagram, the dotted line corresponds to a light wavelength of 650 nm, the solid line corresponds to a light wavelength of 555 nm, and the dashed line corresponds to a light wavelength of 470 nm.

[0254] FIG33 is a distortion diagram of the lens module 210 at the wide-angle end in Example 6. The corresponding light wavelength in the diagram is 555 nm.

[0255] Please refer to FIG. 34 to FIG. 36 , which show relevant curve diagrams of the middle end of the lens module 210 .

[0256] FIG34 is an astigmatism diagram when the lens module 210 is at the middle end in Example 6. In the diagram, the dotted line represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 555 nm.

[0257] Figure 35 is a spherical aberration diagram when the lens module 210 is at the middle end in Example 6. The dotted line in the figure corresponds to a light wavelength of 650nm, the solid line corresponds to a light wavelength of 555nm, and the dashed line corresponds to a light wavelength of 470nm.

[0258] FIG36 is a distortion diagram when the lens module 210 is at the middle end in Example 6. The corresponding light wavelength in the diagram is 555 nm.

[0259] Please refer to FIG. 37 to FIG. 39 , which show relevant curve diagrams of the telephoto end of the lens module 210 .

[0260] FIG37 is an astigmatism diagram of the lens module 210 at the telephoto end in Example 6. In the diagram, the dotted line represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 555 nm.

[0261] Figure 38 is a spherical aberration diagram of the lens module 210 at the telephoto end in Example 6. The dotted line in the figure corresponds to a wavelength of 650 nm, the solid line corresponds to a wavelength of 555 nm, and the dashed line corresponds to a wavelength of 470 nm.

[0262] FIG39 is a distortion diagram of the lens module 210 at the telephoto end in Example 6. The corresponding light wavelength in the diagram is 555 nm.

[0263] It can be seen from FIG. 31 to FIG. 39 that the lens module 210 provided in Example 6 has good imaging quality at the wide-angle end, the middle end, and the telephoto end.

[0264] Example 7

[0265] Please refer to Figure 40. Figure 40 (a) is a schematic diagram of the lens module 210 at the wide-angle end; Figure 40 (b) is a schematic diagram of the lens module 210 at the middle end; and Figure 40 (c) is a schematic diagram of the lens module 210 at the telephoto end. The lens module 210 (lens module 210) provided in this embodiment includes: a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4, arranged in sequence from the object side to the image side. The first lens group G1 includes a first lens L1 and a reflective optical element X. The second lens group G2 includes a second lens L2. The third lens group G3 includes a third lens L3, a fourth lens L4, and a fifth lens L5. The fourth lens group G4 includes a sixth lens L6 and a seventh lens L7. The lens module 210 also includes an aperture 211, which is disposed between the second lens L2 and the third lens L3.

[0266] In Example 7, the field of view (FOV) is 36.04° to 18.91°, the f-number (Fno) is 2.64 to 4.18, and the size of the image sensor 230 is 1 / 1.4 inch.

[0267] For specific data of the lens module 210 provided in Example 7, please refer to Tables 21 to 24.

[0268] Table 21 shows the parameters of the lenses, aperture 211, filter 220, and image sensor 230 of the lens module 210 in Example 7, including the radius of curvature R, spacing D, refractive index Nd, Abbe coefficient Vd, focal length, and focal length of the lens module 210. The units of the radius of curvature R and spacing D are both millimeters (mm). In Table 21, surface numbers 1 to 21 sequentially mark the surfaces of the object, the lenses, aperture 211, filter 220, and imaging surface S231 along the object-to-image direction. The object is denoted as OBJ, the aperture 211 as STO, and the imaging surface S231 as IMA.

[0269] It should be noted that the interval D represents the interval distance D between the current surface and the next surface along the optical axis.

[0270] Table 22 shows the focal length EFL and variable interval D of the lens module 210 corresponding to when the lens module 210 is at the wide-angle end, the middle end, and the telephoto end in Example 7.

[0271] Table 23 shows the k value and the i-th order aspheric coefficient Ai of the aspheric mirror surface of each lens in Example 7. Table 23 includes Table 23a, Table 23b, Table 23c, and Table 23d.

[0272] Table 24 shows the overall parameter data of the lens module 210 in Example 7.

[0273] In this embodiment, the lens module 210 is switched between the wide-angle end, the middle end, and the telephoto end by changing the interval DZ1 between the second lens group G2 and the aperture 211 along the second optical axis Y2 (i.e., the interval distance between the image side surface of the second lens L2 and the object side surface of the aperture 211 along the second optical axis Y2), the interval DZ2 between the third lens group G3 and the fourth lens group G4 along the second optical axis Y2 (i.e., the interval distance between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 along the second optical axis Y2), and the interval DZ3 between the fourth lens group G4 and the filter 220 along the second optical axis Y2 (i.e., the interval distance between the image side surface of the seventh lens L7 and the object side surface of the filter 220 along the second optical axis Y2).

[0274] Please refer to FIG. 41 to FIG. 43 , which show relevant curve diagrams of the wide-angle end of the lens module 210 .

[0275] FIG41 is an astigmatism diagram of the lens module 210 at the wide-angle end in Example 7. In the diagram, the dotted line represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 555 nm.

[0276] Figure 42 is a spherical aberration diagram of the lens module 210 at the wide-angle end in Example 7. The dotted line in the figure corresponds to a light wavelength of 650 nm, the solid line corresponds to a light wavelength of 555 nm, and the dashed line corresponds to a light wavelength of 470 nm.

[0277] FIG43 is a distortion diagram of the lens module 210 at the wide-angle end in Example 7. The corresponding light wavelength in the diagram is 555 nm.

[0278] Please refer to Figures 44 to 46, which show relevant curve graphs of the middle end of the lens module 210.

[0279] Figure 44 is an astigmatism diagram when the lens module 210 is at the middle end in Example 7. In the figure, the dotted line represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 555nm.

[0280] Figure 45 is a spherical aberration diagram when the lens module 210 is at the middle end in Example 7. The dotted line in the figure corresponds to a light wavelength of 650nm, the solid line corresponds to a light wavelength of 555nm, and the dashed line corresponds to a light wavelength of 470nm.

[0281] FIG46 is a distortion diagram when the lens module 210 is at the middle end in Example 7. The corresponding light wavelength in the diagram is 555 nm.

[0282] Please refer to Figures 47 to 49, which show relevant curve diagrams of the telephoto end of the lens module 210.

[0283] FIG47 is an astigmatism diagram of the lens module 210 at the telephoto end in Example 7. In the diagram, the dotted line represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 555 nm.

[0284] Figure 48 is a spherical aberration diagram of the lens module 210 at the telephoto end in Example 7. The dotted line in the figure corresponds to a wavelength of 650 nm, the solid line corresponds to a wavelength of 555 nm, and the dashed line corresponds to a wavelength of 470 nm.

[0285] FIG49 is a distortion diagram of the lens module 210 at the telephoto end in Example 7. The corresponding light wavelength in the diagram is 555 nm.

[0286] It can be seen from FIG. 41 to FIG. 49 that the lens module 210 provided in Example 7 has good imaging quality at the wide-angle end, the middle end, and the telephoto end.

[0287] Referring to Figures 50 and 51 , optionally, in any of the above-described embodiments (including those involving fixed-focus lenses and zoom lenses), the camera module 20 further includes an anti-shake drive structure 240. The anti-shake drive structure 240 is configured to drive the second lens L2 to move in a direction perpendicular to the second optical axis Y2 to achieve anti-shake. The anti-shake drive structure 240 is described below with reference to the accompanying drawings.

[0288] The anti-shake driving structure 240 and the second lens L2 are arranged along the second optical axis Y2. That is, the anti-shake driving structure 240 can be set on the image side of the second lens L2, or on the object side of the second lens L2.

[0289] The anti-shake drive structure 240 includes a driving member 241 and a force-bearing member 242. The force-bearing member 242 is directly or indirectly connected to the object side or image side of the second lens L2 so that the force-bearing member 242 and the second lens L2 are relatively fixed. The driving member 241 is fixedly arranged, that is, the driving member 241 is fixed relative to the optical reflective element. The driving member 241 can drive the force-bearing member 242 to move, so that the force-bearing member 242 drives the second lens L2 to move in a direction perpendicular to the second optical axis Y2 to achieve anti-shake. In other words, the driving member 241 can generate a driving force that drives the force-bearing member 242 and the second lens L2 to move synchronously in a direction perpendicular to the second optical axis Y2.

[0290] Referring to Figure 50 , in one embodiment, the force-bearing member 242 is a magnetic member (e.g., a magnet), and the driving member 241 is a coil. When the coil is energized, it generates a magnetic field that drives the magnet to cause the second lens L2 to perform anti-shake motion in a direction perpendicular to the second optical axis Y2.

[0291] Referring to Figure 51 , in another embodiment, the force-bearing member 242 is a friction member made of a wear-resistant material, and the driving member 241 is a piezoelectric element. The piezoelectric element is positioned on the side of the friction member facing away from the second lens L2 and abuts the friction member. When energized, the piezoelectric element deforms, applying a frictional force to the friction member. This frictional force drives the second lens L2 to perform anti-shake motion in a direction perpendicular to the second optical axis Y2.

[0292] Of course, the driving forms of the driving member 241 and the force-bearing member 242 can also be other types, which are not listed here one by one.

[0293] In the related art, the first lens on the object side of the reflective optical element is designed to move perpendicular to the first optical axis, rather than the second lens on the image side of the reflective optical element. However, this design results in the anti-shake drive structure being located only on the side of the reflective optical element facing away from the second lens. This makes it difficult for the anti-shake drive structure to evenly apply the driving force to the first lens. To achieve a more balanced driving force, the anti-shake drive structure must be designed to be more complex. Of course, to avoid the problem of uneven driving force, the anti-shake drive structure can also be located on the object side or image side of the first lens, but this will increase the height of the camera module.

[0294] Compared to the related art, in this embodiment, the second lens L2 on the image side of the reflective optical element X is used as the anti-shake lens, and the anti-shake driving structure 240 is arranged on the image side or object side of the second lens L2. On the one hand, this prevents the anti-shake driving structure 240 from increasing the height of the camera module 20; on the other hand, the anti-shake driving structure 240 can be provided with multiple force-bearing members 242, which can be arranged sequentially along the circumference of the second lens L2. This ensures that the driving member 241 can provide sufficient driving force and evenly distributes the force on the second lens L2. It can be seen that the structure of this embodiment can effectively overcome the problems existing in the related art.

[0295] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A lens module, characterized in that: The lens module includes: a first lens group and a second lens group arranged in sequence from the object side to the image side along the optical axis. The first lens group includes a first lens and a reflective optical element, and the second lens group includes a second lens. Among them, the first lens has a positive optical power, the reflective optical element is arranged between the first lens and the second lens, and the reflective optical element is used to reflect the light from the first lens to the second lens. The optical axis includes a first optical axis and a second optical axis. The first optical axis passes through the first lens, and the second optical axis passes through the second lens. The second lens can move in a direction perpendicular to the second optical axis for anti-shake.

2. The lens module according to claim 1, characterized in that: The lens module further includes a third lens group and a fourth lens group. The fourth lens group is arranged on the image side of the second lens group, and the third lens group is arranged between the second lens group and the fourth lens group. The first lens group, the second lens group, the third lens group, and the fourth lens group together form a fixed-focus lens.

3. The lens module according to claim 2, characterized in that: The lens module satisfies the following relationship: -1.0 < fL2 / fz < -0.4, where fL2 is the focal length of the second lens and fz is the overall focal length of the lens module.

4. The lens module according to claim 2, characterized in that: The lens module satisfies the following relationship: 1.2 < fL1 / fz < 2.5, where fL1 is the focal length of the first lens and fz is the overall focal length of the lens module.

5. The lens module according to claim 2, characterized in that: The lens module satisfies the following relationship: R1 / fL1 < 1.2, where fL1 is the focal length of the first lens and R1 is the curvature radius of the object side surface of the first lens.

6. The lens module according to claim 2, characterized in that: The lens module satisfies the following relationship: TTL / fz < 1.3, where fz is the overall focal length of the lens module and TTL is the distance between the reflective optical element and the imaging surface of the image sensor.

7. The lens module according to claim 2, characterized in that: The third lens group includes a third lens. The lens module satisfies the following relationship: 0.2 < fL3 / fz < 0.6, where fL3 is the focal length of the third lens and fz is the overall focal length of the lens module.

8. The lens module according to claim 2, characterized in that: The lens module satisfies the following relationship: fz / EPDz < 2.8, where fz is the overall focal length of the lens module and EPDz is the entrance pupil diameter of the lens module.

9. The lens module according to claim 2, characterized in that: The lens module satisfies the following relationship: TTL / IMGH < 3.8, where IMGH is the semi-image height of the image sensor and TTL is the distance between the reflective optical element and the imaging surface of the image sensor.

10. The lens module according to claim 2, wherein: The lens module further includes a diaphragm, and the diaphragm is located on the object side or the image side of the third lens group.

11. The lens module according to claim 1, wherein: The lens module further includes a third lens group and a fourth lens group. The fourth lens group is arranged on the image side of the second lens group, and the third lens group is arranged between the second lens group and the fourth lens group. The first lens group, the second lens group, the third lens group, and the fourth lens group together form a zoom lens; The lens module has a wide-angle end and a telephoto end. The third lens group and the fourth lens group are movable along the second optical axis, so that the lens module can switch between the wide-angle end and the telephoto end for zooming to achieve continuous zooming.

12. The lens module according to claim 11, wherein: The lens module satisfies the following relational expression: -1.0 < fg2 / fz1 < -0.4, where fg2 is the focal length of the second lens group and fz1 is the focal length of the lens module at the wide-angle end.

13. The lens module according to claim 11, characterized in that: The lens module satisfies the following relational expression: TTL / fz3 < 1.1, where fz3 is the focal length of the lens module at the telephoto end and TTL is the distance between the reflective optical element and the imaging surface of the image sensor.

14. The lens module according to claim 11, characterized in that: The lens module satisfies the following relational expression: 1.2 < fL1 / fz1 < 2.5, where fL1 is the focal length of the first lens and fz1 is the focal length of the lens module at the wide-angle end.

15. The lens module according to claim 11, wherein: The third lens group includes a third lens. The lens module satisfies the following relational expression: 0.2 < fL3 / fz1 < 0.6, where fL3 is the focal length of the third lens and fz1 is the focal length of the lens module at the wide-angle end.

16. The lens module according to claim 11, wherein: The lens module satisfies the following relational expression: -1.0 < fg3 / fg4 < -0.5, where fg3 is the focal length of the third lens group and fg4 is the focal length of the fourth lens group.

17. The lens module according to claim 11, characterized in that: The lens module satisfies the following relational expression: fz1 / EPDz1 < 2.8, where fz1 is the focal length of the lens module at the wide-angle end and EPDz1 is the entrance pupil diameter at the wide-angle end.

18. The lens module according to claim 11, wherein: The lens module satisfies the following relational expression: tan(hFOVw) / tan(hFOVt) > 1.5, where hFOVw is the half field of view angle at the wide-angle end and hFOVt is the half field of view angle at the telephoto end.

19. The lens module according to claim 11, wherein: During the zooming process of the lens module from the wide-angle end to the telephoto end, the third lens group moves along the second optical axis towards the object side, and the fourth lens group moves along the second optical axis towards the object side.

20. The lens module according to claim 11, wherein: The lens module further includes a diaphragm. The diaphragm is located on the object side of the third lens group or inside the third lens group. During the zooming process of the lens module, the diaphragm and the third lens group move together.

21. The lens module according to any one of claims 1 to 20, characterized in that: The material of the second lens is plastic.

22. The lens module according to any one of claims 1 to 20, characterized in that: The lens module satisfies the following relational expression: Nd1 > 1.8, where Nd1 is the refractive index of the material of the first lens.

23. The lens module according to any one of claims 1 to 20, characterized in that: The lens module satisfies the following relational expression: Vd2 > 50, where Vd2 is the Abbe number of the material of the second lens.

24. The lens module according to any one of claims 2 to 20, characterized in that: The third lens group includes a third lens. The lens module satisfies the following relational expression: Vd3 > 50, where Vd3 is the Abbe number of the material of the third lens.

25. The lens module according to any one of claims 2 to 20, characterized in that: At least one optical surface of the lenses in the lens module is an aspherical surface.

26. The lens module according to any one of claims 2 to 20, characterized in that: The total number N of lenses in the lens module satisfies: 5 ≤ N ≤ 9.

27. A camera module, characterized in that: The camera module includes an image sensor and the lens module according to any one of claims 1 to 26. The image sensor is used to receive light from the lens module.

28. An electronic device, characterized in that: The electronic device comprises a device body and a camera module as claimed in claim 27, wherein the camera module is installed on the device body.

Images