Optical imaging lens, camera module and electronic device

Abstract

The present application relates to an optical imaging lens (30), a camera module (20), and an electronic device (10). The optical imaging lens (30) comprises a first lens (31) having a positive optical power, a second lens (32) having a positive optical power, a third lens (33) having a negative optical power, and a fourth lens (34) having a negative optical power. An object-side surface of the first lens (31) is a convex surface near an optical axis; the fourth lens (34) is configured to be movable along the optical axis between the third lens (33) and an imaging plane (35) of the optical imaging lens (30), and the optical imaging lens (30) satisfies the following conditional expression: 0.6≤|EFL1 / EFL2|≤1.

Description

Optical imaging lenses, camera modules and electronic devices

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 2024119421383, filed on December 25, 2024, entitled "Optical Imaging Lens, Camera Module and Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of camera technology, and in particular to an optical imaging lens, camera module and electronic device. Background Technology

[0004] With the rapid development of camera technology, more and more electronic devices such as smartphones, tablets, and e-readers are equipped with camera modules to achieve video recording functions. Camera modules typically include an optical imaging lens and an image sensor. The optical imaging lens collects, regulates, and transmits light to the image sensor. To adapt to different video recording needs, camera modules usually also include drive components such as voice coil motors to achieve autofocus, allowing for shooting subjects at different distances. However, in traditional camera modules, the implementation of autofocus increases the space occupied by the camera module, which is detrimental to the thinner design of electronic devices. Summary of the Invention

[0005] On one hand, this application provides an optical imaging lens, which includes, along the optical axis from the object side to the image side, a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power, and a fourth lens with negative optical power. The object side of the first lens is convex near the optical axis; the fourth lens is configured to be movable along the optical axis between the third lens and the imaging plane of the optical imaging lens. Furthermore, the optical imaging lens satisfies the condition: 0.6 ≤ |EFL1 / EFL2| ≤ 1; where EFL1 is the combined focal length of the first lens, the second lens, and the third lens, and EFL2 is the focal length of the fourth lens.

[0006] On the other hand, this application provides a camera module, including an image sensor and an optical imaging lens as described above, wherein the image sensor is disposed at the imaging surface of the optical imaging lens.

[0007] In another aspect, this application provides an electronic device including the camera module described above. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0009] Figure 1 is a schematic diagram of the structure of an electronic device in some embodiments.

[0010] Figure 2 is a schematic diagram of the optical path of the camera module in some embodiments.

[0011] Figure 3 is a schematic diagram of the optical path of the optical imaging lens in some embodiments.

[0012] Figure 4 is a schematic diagram of the camera module in some embodiments.

[0013] Figure 5 is a schematic diagram of the optical imaging lens in the telephoto state in the first embodiment.

[0014] Figure 6 is a schematic diagram of the optical imaging lens in the macro state in the first embodiment.

[0015] Figure 7 is a schematic diagram of the optical imaging lens in the telephoto state in the second embodiment.

[0016] Figure 8 is a schematic diagram of the optical imaging lens in the macro state in the second embodiment.

[0017] Figure 9 is a schematic diagram of the optical imaging lens in the telephoto state in the third embodiment.

[0018] Figure 10 is a schematic diagram of the optical imaging lens in the macro state in the third embodiment.

[0019] Figure 11 shows the astigmatism curve and distortion curve of the optical imaging lens in the first embodiment.

[0020] Figure 12 shows the astigmatism curve and distortion curve of the optical imaging lens in the second embodiment.

[0021] Figure 13 shows the astigmatism curve and distortion curve of the optical imaging lens in the third embodiment.

[0022] Figure 14 is a schematic diagram of the structure of other components of the electronic device in some embodiments. Detailed Implementation

[0023] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0024] As used herein, "electronic device" refers to, but is not limited to, a device capable of receiving and / or transmitting communication signals connected via any one or more of the following connection methods:

[0025] (1) Via wired connection, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, or direct cable connection;

[0026] (2) Via wireless interfaces, such as cellular networks, wireless local area networks (WLANs), digital television networks such as DVB-H networks, satellite networks, and AM-FM broadcast transmitters.

[0027] An electronic device configured to communicate via a wireless interface can be referred to as a "mobile terminal". Examples of mobile terminals include, but are not limited to, the following electronic devices:

[0028] (1) Satellite phone or cellular phone;

[0029] (2) A personal communications system (PCS) terminal that can combine cellular radio telephone with data processing, fax and data communication capabilities;

[0030] (3) Radio telephone, pager, Internet / intranet access, web browser, notepad, calendar, personal digital assistant (PDA) equipped with a Global Positioning System (GPS) receiver;

[0031] (4) Conventional above-knee and / or palm-sized receivers;

[0032] (5) Conventional knee-mounted and / or handheld wireless telephone transceivers, etc.

[0033] This application provides an optical imaging lens, comprising, along the optical axis from the object side to the image side, a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power, and a fourth lens with negative optical power. The object side of the first lens is convex near the optical axis; the fourth lens is configured to move along the optical axis between the third lens and the imaging plane of the optical imaging lens, and the optical imaging lens satisfies the condition: 0.6 ≤ |EFL1 / EFL2| ≤ 1; where EFL1 is the combined focal length of the first lens, the second lens, and the third lens, and EFL2 is the focal length of the fourth lens.

[0034] In one embodiment, the object-side and image-side surfaces of the first lens are both spherical, while the object-side and image-side surfaces of the second lens, the third lens, and the fourth lens are all aspherical.

[0035] In one embodiment, the image-side surface of the first lens is concave near the optical axis; both the object-side surface and the image-side surface of the second lens are convex near the optical axis; the object-side surface of the third lens is concave near the optical axis, and the image-side surface is either convex or concave near the optical axis; the object-side surface of the fourth lens is convex near the optical axis, and the image-side surface is concave near the optical axis.

[0036] In one embodiment, the optical imaging lens satisfies the following condition: 10≤TTL / IMGH≤14;

[0037] Wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface, and IMGH is the half-image height of the optical imaging lens.

[0038] In one embodiment, the optical imaging lens satisfies the following condition: 7°≤FOV≤13°;

[0039] Wherein, FOV is the maximum field of view of the optical imaging lens.

[0040] In one embodiment, the optical imaging lens satisfies the following condition: 3≤EFL / EPD≤4;

[0041] Wherein, EFL is the focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.

[0042] In one embodiment, the optical imaging lens satisfies the following condition: 0.34 ≤ F1 / EFL ≤ 0.54;

[0043] Wherein, F1 is the focal length of the first lens, and EFL is the focal length of the optical imaging lens.

[0044] In one embodiment, the optical imaging lens satisfies the following condition: 0.43≤R1 / F1≤0.63;

[0045] Wherein, R1 is the radius of curvature of the object side of the first lens at the optical axis, and F1 is the focal length of the first lens.

[0046] In one embodiment, the optical imaging lens further includes a prism disposed along the optical axis between the fourth lens and the imaging surface, the prism being used to guide at least a portion of the light rays emitted from the fourth lens to the imaging surface, and the optical imaging lens satisfying the following condition: 0.67≤L / TTL≤0.87;

[0047] Where L is the geometric path of light in the prism, and TTL is the distance on the optical axis from the object side of the first lens to the imaging surface.

[0048] In one embodiment, the optical imaging lens further includes a prism disposed along the optical axis between the fourth lens and the imaging surface. The prism has a first surface. The first lens, the second lens, the third lens, and the fourth lens are coaxially arranged. The fourth lens and the imaging surface are both located on the same side as the first surface of the prism and are opposite to the first surface. At least a portion of the light emitted from the fourth lens can enter the prism from the first surface and, after at least one reflection in the prism, exit from the first surface onto the imaging surface.

[0049] In one embodiment, the prism further has a second reflecting surface and a third reflecting surface, the second reflecting surface being inclined to the first surface and opposite to the fourth lens in the axial direction of the fourth lens, the third reflecting surface being inclined to the first surface and opposite to the imaging surface in the perpendicular direction of the imaging surface, and light rays entering the prism from the first surface exiting from the first surface after being reflected by at least the second reflecting surface and the third reflecting surface.

[0050] In one embodiment, the prism further has a fourth reflecting surface opposite to the first surface and located between the second reflecting surface and the third reflecting surface, so that light rays incident on the prism from the first surface can be reflected sequentially by the second reflecting surface, the first surface, the fourth reflecting surface, the first surface and the third reflecting surface before exiting from the first surface.

[0051] In one embodiment, the optical imaging lens further includes an aperture stop disposed on the object side of the first lens.

[0052] In one embodiment, the optical imaging lens further includes a filter element disposed between the fourth lens and the imaging surface.

[0053] A camera module includes an image sensor and an optical imaging lens as described in any of the above embodiments, wherein the image sensor is disposed at the imaging surface of the optical imaging lens.

[0054] In one embodiment, the optical imaging lens further includes a prism disposed along the optical axis between the fourth lens and the imaging surface. The prism has a first surface. The first lens, the second lens, the third lens, and the fourth lens are coaxially arranged. The fourth lens and the imaging surface are both located on the same side as the first surface of the prism and are opposite to the first surface. At least a portion of the light emitted from the fourth lens can enter the prism from the first surface and, after at least one reflection in the prism, exit from the first surface onto the imaging surface.

[0055] The camera module further includes a focus driving element and an image stabilization driving element. The focus driving element is used to drive the fourth lens to move along the optical axis between the third lens and the first surface. The image stabilization driving element is used to drive the image sensor to move on a plane perpendicular to the imaging surface.

[0056] A camera module includes an optical imaging lens and an image sensor. The optical imaging lens includes a lens and a prism. The prism has a first surface, a second reflective surface, and a third reflective surface. The lens and the image sensor are located on one side of the first surface of the prism and are opposite to the first surface. The second reflective surface is inclined to the first surface and is opposite to the lens in the axial direction of the lens. The third reflective surface is inclined to the first surface and is opposite to the image sensor in the perpendicular direction of the imaging plane of the optical imaging lens. At least a portion of the light emitted from the lens can enter the prism from the first surface and, after being reflected by the second reflective surface and the third reflective surface, exit from the first surface to the image sensor.

[0057] In one embodiment, the prism further has a fourth reflecting surface opposite to the first surface and located between the second reflecting surface and the third reflecting surface, so that light rays incident on the prism from the first surface can be reflected sequentially by the second reflecting surface, the first surface, the fourth reflecting surface, the first surface and the third reflecting surface before exiting from the first surface.

[0058] In one embodiment, the optical imaging lens includes a plurality of lenses, wherein the lens closest to the prism is configured to be movable along the optical axis between the remaining lenses and the prism.

[0059] In one embodiment, the optical imaging lens satisfies the following condition: 0.67 ≤ L / TTL ≤ 0.87;

[0060] Where L is the geometric path of light in the prism, and TTL is the distance on the optical axis from the object side of the lens closest to the object side of the optical imaging lens to the imaging surface of the optical imaging lens.

[0061] An electronic device includes a camera module as described in any of the above embodiments.

[0062] Please refer to Figures 1 and 2. Figure 1 is a schematic diagram of the structure of the electronic device 10 in some embodiments, and Figure 2 is a schematic diagram of the structure of the camera module 20 in some embodiments. The camera module 20 provided in this application includes, but is not limited to, any applicable electronic device 10 such as smartphones, tablets, e-readers, and wearable devices. The camera module 20 can collect image information from the object side, so that the electronic device 10 has the functions of image capture and shooting. The embodiments of this application use smartphones as an example for description.

[0063] In some embodiments, the electronic device 10 further includes a housing 11, within which a camera module 20 is disposed. The housing 11 may include a mid-frame and a rear cover. The mid-frame may be generally rectangular, and the rear cover covers one side of the mid-frame. The camera module 20 is located within the receiving space formed by the rear cover and the mid-frame, and is exposed to the rear cover to collect light from the rear cover side of the electronic device 10. The electronic device 10 may also include a display screen, which covers the side of the mid-frame facing away from the rear cover. When the camera module 20 is used to collect light from the rear cover side of the electronic device 10, the camera module 20 may be a rear-facing camera. In other embodiments, the camera module 20 may also be a front-facing camera, in which case the camera module 20 may be exposed to the side where the display screen is located and used to collect light from that side.

[0064] In some embodiments, the camera module 20 includes an optical imaging lens 30 and an image sensor 21. The image sensor 21 includes, but is not limited to, a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) sensor. The optical imaging lens 30 has an imaging surface 35, and the image sensor 21 is disposed at the imaging surface 35. The imaging surface 35 is a virtual plane, and it may at least partially overlap with the photosensitive surface of the image sensor 21. The optical imaging lens 30 may be opposite to the light-transmitting hole 111 of the housing 11 and collects ambient light through the light-transmitting hole 111. The optical imaging lens 30 includes multiple lenses with optical power. The light collected by the camera module 20 is adjusted and transmitted by the multiple lenses in the optical imaging lens 30 and then projected onto the imaging surface 35 to form an image on the image sensor 21. The axis of the optical imaging lens 30 may be parallel to the thickness direction of the electronic device 10, and the thickness direction of the camera module 20 corresponds to the thickness direction of the electronic device 10.

[0065] Furthermore, in some embodiments, the optical imaging lens 30 comprises four lenses with optical power. Along the optical axis from the object side to the image side, the optical imaging lens 30 sequentially includes a first lens 31 with positive optical power, a second lens 32 with positive optical power, a third lens 33 with negative optical power, and a fourth lens 34 with negative optical power. The object side of the first lens 31 is convex near the optical axis. The fourth lens 34 is configured to move along the optical axis between the third lens 33 and the imaging plane 35 to achieve the optical focusing function of the optical imaging lens 30, thereby changing the object distance of the optical imaging lens 30 and enabling the optical imaging lens 30 to image subjects at different object distances. The optical imaging lens 30 satisfies the condition: 0.6≤|EFL1 / EFL2|≤1; where EFL1 is the focal length of the fixed group composed of the first lens 31, the second lens 32 and the third lens 33, that is, the combined focal length of the first lens 31, the second lens 32 and the third lens 33, and EFL2 is the focal length of the fourth lens 34.

[0066] The aforementioned optical imaging lens 30 features a first lens 31 whose positive optical power matches the convex surface of the object-side surface, effectively converging light rays from the object side. This, combined with the positive optical power of the second lens 32, further enhances the converging effect, resulting in smoother light transitions, suppressing aberrations such as distortion, and improving the image quality of the optical imaging lens 30. It also helps increase the equivalent focal length of the optical imaging lens 30, facilitating the realization of a telephoto design. The third lens 33 has a negative optical power, balancing the optical power distribution of the optical imaging lens 30 and preventing excessive light convergence, thus helping to suppress aberrations. The fourth lens 34's negative optical power further extends the equivalent focal length of the optical imaging lens 30, enabling a telephoto design. It also helps adjust the incident angle of light on the imaging surface 35, improving image quality.

[0067] Furthermore, the aforementioned optical imaging lens 30 achieves optical focusing through the movement of the fourth lens 34 along the optical axis. This not only reduces the burden on the focusing drive, thereby reducing the weight and space required for focusing, but also changes the focal length of the optical imaging lens 30 during focusing by using internal focusing. Combined with the optical power and surface design of each lens, this effectively reduces the focusing travel distance for the same object distance change, further reducing the space required for focusing and thus compressing the space occupied by the optical imaging lens 30. Therefore, the aforementioned optical imaging lens 30 balances telephoto design, good image quality, and miniaturization. When used in the camera module 20 of the electronic device 10, it helps to reduce the space occupied by the camera module 20 within the electronic device 10, thereby reducing the thickness of the electronic device 10 and facilitating a thinner design.

[0068] In some embodiments, the object-side and image-side surfaces of the first lens 31 are both spherical, while the object-side and image-side surfaces of at least one of the second lens 32, the third lens 33, and the fourth lens 34 are both aspherical. For example, the object-side and image-side surfaces of the second lens 32, the third lens 33, and the fourth lens 34 are all aspherical. This configuration balances design difficulty, manufacturing cost, and design flexibility. The aspherical surface effectively corrects aberrations such as spherical aberration, which is beneficial for improving the imaging quality of the optical imaging lens 30. It also helps to reduce the radial dimension of the optical imaging lens 30, while the spherical surface helps to reduce manufacturing difficulty and cost. It is understood that when a surface of a lens is spherical, its surface shape is the same near the optical axis and at the circumference. When a surface of a lens is aspherical, its surface shape near the optical axis and at the circumference can be the same or different. The surface shape at the circumference can be designed according to imaging requirements. This application does not limit the surface shape of each aspherical lens at the circumference.

[0069] In some embodiments, the image-side surface of the first lens 31 is concave near the optical axis; both the object-side and image-side surfaces of the second lens 32 are convex near the optical axis; the object-side surface of the third lens 33 is concave near the optical axis, and the image-side surface is either convex or concave near the optical axis; and the object-side surface of the fourth lens 34 is concave near the optical axis, and the image-side surface is also concave near the optical axis. The concave image-side surface of the first lens 31, combined with its optical power and object-side surface shape, facilitates the rational control of light path and adjusts the convergence of light rays, resulting in a smoother light transition and helping to suppress aberrations such as distortion and spherical aberration. The biconvex shape of the second lens 32, combined with its optical power, allows light to propagate more concentratedly to the imaging surface 35 and helps correct chromatic aberration, thus improving the imaging quality of the optical imaging lens 30. The concave surface of the object-side surface of the third lens 33, combined with its optical power design, effectively diverges light rays and prevents excessive convergence. This helps balance aberrations such as astigmatism and field curvature, resulting in a more uniform distribution of light on the imaging surface 35 and improving the imaging quality at the edges of the field of view and overall image sharpness. The convex-concave surface of the fourth lens 34, combined with its optical power design, helps maintain good image quality during optical focusing by moving the fourth lens 34, suppressing aberrations and ensuring that the optical imaging lens 30 provides good image quality for subjects at different object distances.

[0070] In some embodiments, the optical imaging lens 30 may also be provided with an aperture stop 36, which may be disposed on the object side of the first lens 31, for example, on the object side surface of the first lens 31. In other embodiments, the aperture stop 36 may also be disposed between any two lenses. In some embodiments, the optical imaging lens 30 further includes a filter element 37 disposed between the fourth lens 34 and the imaging surface 35. The filter element 37 includes, but is not limited to, an infrared cut-off filter. The filter element 37 is used to filter out interference light and prevent interference light from reaching the imaging surface 35 and affecting normal imaging. Of course, the filter element 37 may also be replaced by a flat protective glass or omitted. When the filter element 37 is omitted, the on-axis distance between the fourth lens 34 and the imaging surface 35 remains unchanged.

[0071] In some embodiments, the lenses in the optical imaging lens 30 can be made of either glass or plastic. Using plastic lenses reduces the weight of the optical imaging lens 30 and lowers production costs, which, combined with the small size of the camera module 20, enables a slimmer and lighter design for the electronic device 10. Using glass lenses, on the other hand, gives the optical imaging lens 30 excellent optical performance and high temperature resistance. It should be noted that the lenses in the optical imaging lens 30 can also be made of any combination of glass and plastic, and do not necessarily have to be made entirely of glass or entirely of plastic.

[0072] In some embodiments, the optical imaging lens 30 satisfies the condition: 10 ≤ TTL / IMGH ≤ 14; where TTL is the distance on the optical axis from the object side of the first lens 31 to the imaging surface 35, which is the total optical length of the optical imaging lens 30, and IMGH is the half-image height of the optical imaging lens 30. For example, TTL / IMGH can be 10, 11, 12, 13, or 14. When the above condition is satisfied, the ratio of the total optical length to the half-image height of the optical imaging lens 30 can be reasonably configured, which is beneficial to balancing the optical performance and on-axis physical dimensions of the optical lens. It can compress the on-axis dimensions of the optical imaging lens 30 while realizing a telephoto design, thereby facilitating both telephoto and miniaturization designs.

[0073] In some embodiments, the optical imaging lens 30 satisfies the condition: 7° ≤ FOV ≤ 13°; where FOV is the maximum field of view of the optical imaging lens 30. For example, FOV can be 7°, 8°, 9°, 10°, 11°, 12°, or 13°. When the above condition is satisfied, the maximum field of view of the optical imaging lens 30 can be reasonably configured. Combined with the telephoto design of the optical imaging lens 30, it can achieve better background blur and subject highlighting effects during shooting, thus improving the user's shooting experience.

[0074] It should be noted that in some embodiments, the optical imaging lens 30 can be matched with an image sensor 21 having a square photosensitive surface. In this case, the imaging surface 35 has a square effective pixel area with a diagonal direction. Then, IMGH is the length of the diagonal of the effective pixel area on the imaging surface 35, and FOV is the field of view of the optical imaging lens 30 in the diagonal direction of the corresponding effective pixel area.

[0075] In some embodiments, the optical imaging lens 30 satisfies the condition: 3 ≤ EFL / EPD ≤ 4; where EFL is the focal length of the optical imaging lens 30, and EPD is the entrance pupil diameter of the optical imaging lens 30. For example, EFL / EPD can be 3, 3.5, or 4. Satisfying the above condition helps to balance the magnification, depth of field, and light intake of the optical imaging lens 30, improves the background blur and subject highlighting effect of the optical imaging lens 30 in telephoto design, and also facilitates the rational configuration of the relative aperture of the optical imaging lens 30 to achieve large aperture characteristics, as well as improve image brightness and image quality.

[0076] In some embodiments, the optical imaging lens 30 satisfies the condition: 0.34 ≤ F1 / EFL ≤ 0.54; where F1 is the focal length of the first lens 31 and EFL is the focal length of the optical imaging lens 30. For example, F1 / EFL can be 0.34, 0.38, 0.42, 0.47, 0.5, or 0.54. When the above condition is satisfied, the optical power ratio of the first lens 31 in the optical imaging lens 30 can be reasonably configured, so that the first lens 31 can reasonably converge light rays, achieve effective refraction of light rays with a large field of view, suppress aberrations such as spherical aberration and distortion while collecting light, improve the imaging quality of the optical imaging lens 30, and at the same time, it is beneficial to avoid excessive concentration of optical power in the first lens 31, which helps to reduce the tolerance sensitivity of the first lens 31 and provides more relaxed tolerance conditions for the molding and assembly process of the first lens 31.

[0077] In some embodiments, the optical imaging lens 30 satisfies the condition: 0.43 ≤ R1 / F1 ≤ 0.63; where R1 is the radius of curvature of the object-side surface of the first lens 31 at the optical axis, and F1 is the focal length of the first lens 31. For example, R1 / F1 can be 0.43, 0.47, 0.5, 0.55, 0.59, or 0.63. When the above condition is satisfied, the ratio of the radius of curvature of the object-side surface of the first lens 31 to the focal length can be reasonably configured. This is beneficial for the first lens 31 to reasonably deflect light, suppress the generation of aberrations such as astigmatism, field curvature, spherical aberration, and chromatic aberration, and improve the imaging quality of the optical imaging lens 30. It is also beneficial for avoiding strong total internal reflection ghosting caused by excessive deflection angle in the first lens 31. At the same time, it is also beneficial for simplifying the surface shape of the object-side surface of the first lens 31 and improving the molding yield of the first lens 31.

[0078] In some embodiments, the optical imaging lens 30 further includes a prism 38 disposed along the optical axis between the fourth lens 34 and the filter element 37. The prism 38 is used to transmit at least a portion of the light emitted from the fourth lens 34 to the imaging surface 35 through reflection, refraction, or other means. The optical imaging lens 30 satisfies the condition: 0.67 ≤ L / TTL ≤ 0.87; where L is the geometric path of the light in the prism 38, and TTL is the distance on the optical axis from the object side of the first lens 31 to the imaging surface 35. For example, L / TTL can be 0.67, 0.7, 0.75, 0.8, 0.82, or 0.87. Satisfying the above condition is beneficial for increasing the geometric path of the light in the prism 38 to achieve a long back focal length. Combined with the light transmission by the prism 38, the periscope design of the optical imaging lens 30 is better realized, taking into account both the telephoto design and the miniaturization design.

[0079] It should be noted that in the embodiment shown in Figure 2, the prism 38 is replaced by an equivalent flat glass to facilitate the illustration of the light path. This should not be construed as a limitation on the structure of the prism 38. In this application, the camera module 20 can adopt a periscope design, in which case the prism 38 can transmit light through one or more reflections, thereby further reducing the space occupied by the camera module 20 in the thickness direction of the electronic device 10, which is conducive to the thin design of the electronic device 10.

[0080] Referring to Figures 3 and 4, in some embodiments, the prism 38 has a first surface 381, a second reflecting surface 382, ​​and a third reflecting surface 383. The first lens 31, second lens 32, third lens 33, and fourth lens 34 are coaxially arranged. The fourth lens 34 and the imaging surface 35 are located on the same side as the first surface 381 of the prism 38 and are both opposite to the first surface 381. The second reflecting surface 382 is inclined to the first surface 381 and is opposite to the fourth lens 34 along its axial direction. The third reflecting surface 383 is inclined to the first surface 381 and is opposite to the image sensor 21 along the perpendicular direction of the imaging surface 35. At least a portion of the light emitted from the fourth lens 34 can enter the prism 38 from the area of ​​the first surface 381 opposite to the fourth lens 34, and after reflection by at least the second reflecting surface 382 and the third reflecting surface 383, exit the prism 38 from the area of ​​the first surface 381 opposite to the image sensor 21 and then reach the image sensor 21. By reflecting light through prism 38, the light path can be folded, thereby folding part of the light path in the thickness direction of electronic device 10. This helps to reduce the size of the camera module 20 with telephoto design in the thickness direction of electronic device 10, thus facilitating the thinner design of electronic device 10.

[0081] Understandably, since the light is reflected at least twice by the second reflecting surface 382 and the third reflecting surface 383 in the prism 38, the prism 38 is used to guide the light to the image sensor 21 after at least two reflections, so that the axis of the fourth lens 34 is perpendicular to the imaging surface 35. That is, the prism 38 can deflect the light path by 180°. With this configuration, the prism 38 can fold the light path through multiple reflections, increasing the geometric path of the light in the prism 38 to achieve a telephoto design while effectively compressing the volume of the prism 38. Furthermore, when the axis of the fourth lens 34 is parallel to the thickness direction of the electronic device 10, the image sensor 21 and the filter element 37 in the thickness direction of the electronic device 10 coincide with at least a portion of the dimensions of the four lenses in the optical imaging lens 30, which can effectively compress the size of the camera module 20 in the thickness direction of the electronic device 10.

[0082] Referring to Figures 1 and 4, in some embodiments, a light-transmitting hole 111 is provided on the housing 11. When the camera module 20 is housed within the housing 11, the light-incident side of the camera module 20 corresponds to the light-transmitting hole 111 to facilitate the collection of light entering the light-transmitting hole 111. In other words, the first lens 31 is opposite to the light-transmitting hole 111. Thus, the light-transmitting hole 111 can be adapted to the shape of the lens in the optical imaging lens 30, which is set to be circular, and can be matched with other hole structures of the electronic device 10. Compared with the traditional light-transmitting hole 111, which requires the prism 38 to be set to be square to adapt to the shape of the prism 38, this is beneficial to improving the appearance consistency of the electronic device 10. Furthermore, compared to traditional camera modules where the prism is located on the object side of each lens, requiring the lenses to be chamfered to accommodate the light guiding of the prism, the first lens 31 in this embodiment, as the object-side light-receiving component of the camera module 20, does not require lens chamfering. This is beneficial for increasing the aperture of the camera module 20, improving the light-receiving effect of the camera module 20, and thus improving the imaging brightness and imaging quality of the camera module 20.

[0083] It is understandable that the angles between the second reflecting surface 382 and the third reflecting surface 383 and the first surface 381, as well as the different lengths of the prism 38, will result in different numbers of reflections of light within the prism 38. For example, the smaller the acute angle between the second reflecting surface 382 and the third reflecting surface 383 and the first surface 381, and the larger the length of the prism 38, the more times the light can be reflected within the prism 38, and the longer the geometric path of the light within the prism 38. This improves the flexibility of the optical path design of the prism 38 and the camera module 20, adapting to the needs of different telephoto designs. For instance, in some embodiments, light incident on the prism 38 from the first surface 381 can be reflected sequentially by the second reflecting surface 382 and the third reflecting surface 383 before exiting from the first surface 381, resulting in two reflections within the prism 38. In other embodiments, light rays incident on the prism 38 from the first surface 381 can be reflected sequentially by the second reflecting surface 382, ​​the first surface 381, and the third reflecting surface 383 before exiting from the first surface 381. The light rays undergo three reflections within the prism 38, enabling a longer focal length and a greater magnification.

[0084] Further, referring to FIG4, in some embodiments, the prism 38 also has a fourth reflecting surface 384 opposite to the first surface 381 and located between the second reflecting surface 382 and the third reflecting surface 383. Light rays incident on the prism 38 from the first surface 381 can be reflected sequentially by the second reflecting surface 382, ​​the first surface 381, the fourth reflecting surface 384, the first surface 381, and the third reflecting surface 383 before exiting from the first surface 381. Specifically, at least a portion of the light rays incident from the first surface 381 can hit the second reflecting surface 382 and be reflected by the second reflecting surface 382 back to the first surface 381, then reflected by the first surface 381 to the fourth reflecting surface 384, reflected by the fourth reflecting surface 384 back to the first surface 381, then reflected by the first surface 381 to the third reflecting surface 383, and finally reflected by the third reflecting surface 383 and exiting from the first surface 381. In other words, in this embodiment, light can undergo five reflections within the prism 38, which can effectively increase the geometric path of light within the prism 38, enabling the camera module 20 to achieve a longer focal length design.

[0085] In some embodiments, the camera module 20 further includes a focusing drive element 22 and an image stabilization drive element 23. The focusing drive element 22 drives the fourth lens 34 to move along the optical axis between the third lens 33 and the first surface 381 to achieve the optical focusing function of the camera module 20. The image stabilization drive element 23 drives the image sensor 21 to move in a plane perpendicular to the imaging surface 35 to achieve the optical image stabilization function of the camera module 20. By driving the fourth lens 34 to achieve optical focusing, the load on the focusing drive element 22 can be reduced, thereby reducing the size, weight and cost of the focusing drive element 22. At the same time, it is also beneficial to reduce the focusing stroke of the fourth lens 34 by means of the internal focusing design of the optical imaging lens 30, thereby effectively compressing the size of the camera module 20 in the thickness direction of the electronic device 10. Meanwhile, optical image stabilization is achieved by driving the image sensor 21 to move relative to the prism 38. This also helps reduce the load on the image stabilization drive element 23 and the risk of interference between the image stabilization drive element 23 and the focus drive element 22, thus improving the performance and reliability of the camera module 20. In addition, the design of the reflective and folded optical path of the prism 38 ensures that at least part of the dimensions of the focus drive element 22 and the image stabilization drive element 23 coincide in the axial direction of the fourth lens 34. This further reduces the size of the camera module 20 in the thickness direction of the electronic device 10, which is beneficial for the thinner design of the electronic device 10. The focus drive element 22 includes, but is not limited to, a voice coil motor, a stepper motor, etc., and the image stabilization drive element 23 includes, but is not limited to, a microelectromechanical system driver, a piezoelectric ceramic driver, etc.

[0086] Based on the descriptions of the above embodiments, more specific embodiments and accompanying drawings are provided below for detailed explanation.

[0087] Please refer to Figures 5 and 6, which are schematic diagrams of the optical imaging lens 30 in the first embodiment in telephoto and macro states, respectively. In the first embodiment, the image-side surface of the third lens 33 is concave near the optical axis. As can be seen from Figures 5 and 6, the optical imaging lens 30 can change the object distance by driving the fourth lens 34 to move along the optical axis between the third lens 33 and the imaging surface 35, thereby achieving clear imaging of subjects at different object distances.

[0088] It should be noted that the telephoto and macro states of the optical imaging lens 30 are merely examples of two object distance states of the optical imaging lens 30, and are not to be construed as limiting the focusing range of the optical imaging lens 30. Of course, in some embodiments, the telephoto and macro states involved in this application may also refer to the two states of the optical imaging lens 30 with the maximum and minimum object distance within the focusing range, respectively, and the same applies to other embodiments.

[0089] The parameters of the optical imaging lens 30 in the first embodiment are given in Table 1 below.

[0090] Table 1

[0091] In the first embodiment, the object-side and image-side surfaces of the second lens 32, the third lens 33, and the fourth lens 34 are all aspherical surfaces, and the aspherical coefficients are given in Table 2 below, where A4-A20 represent the types of aspherical coefficients, A4 represents a fourth-order aspherical coefficient, A6 represents a sixth-order aspherical coefficient, A8 represents an eighth-order aspherical coefficient, and so on. The formula for the aspherical coefficients is as follows:

[0092] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, K is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula.

[0093] Table 2

[0094] In the first embodiment, the aperture of the optical imaging lens 30 satisfies: F = 3.48, the maximum field of view satisfies: FOV = 10.8°, and the focal length satisfies: EFL = 34.77mm. In macro mode, the object distance of the optical imaging lens 30 is 1.2m, and the focusing travel of the fourth lens 34 on the optical axis is 300um.

[0095] Please refer to Figures 7 and 8, which are schematic diagrams of the optical imaging lens 30 in the telephoto and macro states of the second embodiment, respectively. In the second embodiment, the image-side surface of the third lens 33 is convex near the optical axis. The parameters of the optical imaging lens 30 in the second embodiment are given in Table 3 below.

[0096] Table 3

[0097] In the second embodiment, the aspherical coefficients of the object side and image side of the second lens 32, the third lens 33 and the fourth lens 34 are given in Table 4 below.

[0098] Table 4

[0099] In the second embodiment, the aperture of the optical imaging lens 30 satisfies: F=3.4, the maximum field of view satisfies: FOV=10.7°, and the focal length satisfies: EFL=34.85mm. In macro mode, the object distance of the optical imaging lens 30 is 90cm, and the focusing distance of the fourth lens 34 on the optical axis is 380um.

[0100] Please refer to Figures 9 and 10, which are schematic diagrams of the optical imaging lens 30 in the telephoto and macro states of the third embodiment, respectively. In the third embodiment, the image-side surface of the third lens 33 is concave near the optical axis. The parameters of the optical imaging lens 30 in the third embodiment are given in Table 5 below.

[0101] Table 5

[0102] In the second embodiment, the aspherical coefficients of the object side and image side of the second lens 32, the third lens 33 and the fourth lens 34 are given in Table 6 below.

[0103] Table 6

[0104] In the third embodiment, the aperture of the optical imaging lens 30 satisfies: F = 3.47, the maximum field of view satisfies: FOV = 10.8°, and the focal length satisfies: EFL = 34.6mm. In macro mode, the object distance of the optical imaging lens 30 is 1.2m, and the focusing travel of the fourth lens 34 on the optical axis is 300um.

[0105] Please refer to Figures 11, 12 and 13. Figures 11-13 are astigmatism curves and distortion curves of the optical imaging lens 30 in the first embodiment, the second embodiment and the third embodiment, respectively. As can be seen from Figures 11-13, the astigmatism and distortion of the optical imaging lens 30 in each embodiment of this application can be effectively corrected, thereby achieving good imaging quality while realizing telephoto and miniaturized design.

[0106] The optical imaging lens 30 of the above embodiments also satisfies the data in Table 7 below. The effects that can be obtained by satisfying the following data can be obtained by referring to the above description, and will not be repeated here.

[0107] Table 7

[0108] Referring to Figure 14, which is a schematic diagram of the structure of an electronic device 10 provided in an embodiment of this application, the electronic device 10 may include a radio frequency (RF) circuit 501, a memory 502 including one or more computer-readable storage media, an input unit 503, a display unit 504, a sensor 505, an audio circuit 506, a wireless fidelity (WiFi) module 507, a processor 508 including one or more processing cores, and a power supply 509, etc. Those skilled in the art will understand that the structure of the electronic device 10 shown in Figure 14 does not constitute a limitation on the electronic device 10, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0109] The radio frequency (RF) circuit 501 can be used to send and receive information, or to receive and send signals during a call. Specifically, it receives downlink information from the base station and hands it over to one or more processors 508 for processing; additionally, it sends uplink data to the base station. Typically, the RF circuit 501 includes, but is not limited to, an antenna, at least one amplifier, a tuner, one or more oscillators, a Subscriber Identity Module (SIM) card, a transceiver, a coupler, a low-noise amplifier (LNA), a duplexer, etc. Furthermore, the RF circuit 501 can also communicate wirelessly with networks and other devices. This wireless communication can use any communication standard or protocol, including but not limited to GSM, GPRS, CDMA, WCDMA, LTE, email, and SMS.

[0110] Memory 502 can be used to store applications and data. The applications stored in memory 502 contain executable code. Applications can be composed of various functional modules. Processor 508 executes various functional applications and data processing by running the applications stored in memory 502. Memory 502 may primarily include a program storage area and a data storage area. The program storage area may store the operating system, applications required for at least one function (such as sound playback, image playback, etc.), etc.; the data storage area may store data created based on the use of electronic device 10 (such as audio data, phonebook, etc.). Furthermore, memory 502 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, memory 502 may also include a memory controller to provide access to memory 502 for processor 508 and input unit 503.

[0111] Input unit 503 can be used to receive input numbers, character information, or user characteristic information (such as fingerprints), and to generate keyboard, mouse, joystick, optical, or trackball signal inputs related to user settings and function control. Specifically, in one embodiment, input unit 503 may include a touch-sensitive surface and other input devices. The touch-sensitive surface, also known as a touch display or touchpad, can collect touch operations performed by the user on or near it (such as operations performed by the user using a finger, stylus, or any suitable object or accessory on or near the touch-sensitive surface), and drive corresponding connection devices according to a pre-set program. Optionally, the touch-sensitive surface may include two parts: a touch detection device and a touch controller. The touch detection device detects the user's touch orientation and the signal generated by the touch operation, transmitting the signal to the touch controller; the touch controller receives touch information from the touch detection device, converts it into touch point coordinates, sends it to the processor 508, and can receive and execute commands from the processor 508.

[0112] Display unit 504 can be used to display information input by the user or information provided to the user, as well as various graphical user interfaces of electronic device 10. These graphical user interfaces can be composed of graphics, text, icons, video, and any combination thereof. Display unit 504 may include a display panel. Optionally, the display panel can be configured in the form of a liquid crystal display (LCD), organic light-emitting diode (OLED), or the like. Further, a touch-sensitive surface can cover the display panel. When the touch-sensitive surface detects a touch operation on or near it, it transmits the information to processor 508 to determine the type of touch event. Subsequently, processor 508 provides corresponding visual output on the display panel according to the type of touch event. Although in FIG. 14, the touch-sensitive surface and the display panel are implemented as two separate components to realize input and output functions, in some embodiments, the touch-sensitive surface and the display panel can be integrated to realize input and output functions.

[0113] The electronic device 10 may also include at least one sensor 505, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor. The ambient light sensor can adjust the brightness of the display panel according to the ambient light level, and the proximity sensor can turn off the display panel and / or backlight when the electronic device 10 is moved to the ear. As a type of motion sensor, a gravity acceleration sensor can detect the magnitude of acceleration in various directions (generally three axes). When stationary, it can detect the magnitude and direction of gravity and can be used for applications that recognize the phone's posture (such as landscape / portrait switching, related games, magnetometer posture calibration), vibration recognition-related functions (such as pedometer, tapping), etc. Other sensors that may be configured in the electronic device 10, such as gyroscopes, barometers, hygrometers, thermometers, and infrared sensors, will not be described in detail here.

[0114] Audio circuit 506 provides an audio interface between the user and electronic device 10 via a speaker and microphone. Audio circuit 506 converts received audio data into electrical signals, transmits them to the speaker, and the speaker outputs them as sound signals. Conversely, the microphone converts collected sound signals into electrical signals, which are then received by audio circuit 506, converted back into audio data, and processed by processor 508. The audio data is then transmitted via radio frequency circuit 501 to, for example, another electronic device 10, or output to memory 502 for further processing. Audio circuit 506 may also include a headphone jack to facilitate communication between peripheral headphones and electronic device 10.

[0115] Wi-Fi is a short-range wireless transmission technology. Electronic device 10, through Wi-Fi module 507, can help users send and receive emails, browse web pages, and access streaming media, providing users with wireless broadband internet access. Although Figure 14 shows Wi-Fi module 507, it is understood that it is not a necessary component of electronic device 10 and can be omitted as needed without changing the essence of the invention.

[0116] The processor 508 is the control center of the electronic device 10. It connects various parts of the electronic device 10 via various interfaces and lines. By running or executing applications stored in the memory 502 and calling data stored in the memory 502, it performs various functions and processes data of the electronic device 10, thereby providing overall monitoring of the electronic device 10. Optionally, the processor 508 may include one or more processing cores; preferably, the processor 508 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications, while the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 508.

[0117] The electronic device 10 also includes a power supply 509 that supplies power to the various components. Preferably, the power supply 509 can be logically connected to the processor 508 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 509 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0118] Although not shown in Figure 14, the electronic device 10 may also include a Bluetooth module, etc., which will not be described in detail here. In specific implementation, the above modules can be implemented as independent entities, or they can be arbitrarily combined and implemented as the same or several entities. For the specific implementation of the above modules, please refer to the previous method embodiments, which will not be described in detail here.

[0119] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0120] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An optical imaging lens, comprising, along the optical axis from the object side to the image side, the following components in sequence: A first lens with positive optical power, wherein the object side of the first lens is convex near the optical axis; A second lens with positive optical power; A third lens with negative optical power; A fourth lens with negative optical power; The fourth lens is configured to move along the optical axis between the third lens and the imaging plane of the optical imaging lens, and the optical imaging lens satisfies the following condition: 0.6 ≤ |EFL1 / EFL2| ≤ 1; Wherein, EFL1 is the combined focal length of the first lens, the second lens, and the third lens, and EFL2 is the focal length of the fourth lens.

2. The optical imaging lens according to claim 1, wherein, The object-side and image-side surfaces of the first lens are both spherical, while the object-side and image-side surfaces of the second lens, the third lens, and the fourth lens are all aspherical.

3. The optical imaging lens according to claim 1, wherein, The image-side surface of the first lens is concave near the optical axis; the object-side surface and image-side surface of the second lens are both convex near the optical axis; the object-side surface of the third lens is concave near the optical axis, and the image-side surface is either convex or concave near the optical axis; the object-side surface of the fourth lens is convex near the optical axis, and the image-side surface is concave near the optical axis.

4. The optical imaging lens according to claim 1, wherein, The optical imaging lens satisfies the following condition: 10≤TTL / IMGH≤14; Wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface, and IMGH is the half-image height of the optical imaging lens.

5. The optical imaging lens according to claim 1, wherein, The optical imaging lens satisfies the following condition: 7°≤FOV≤13°; Wherein, FOV is the maximum field of view of the optical imaging lens.

6. The optical imaging lens according to claim 1, wherein, The optical imaging lens satisfies the following condition: 3≤EFL / EPD≤4; Wherein, EFL is the focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.

7. The optical imaging lens according to claim 1, wherein, The optical imaging lens satisfies the following condition: 0.34≤F1 / EFL≤0.54; Wherein, F1 is the focal length of the first lens, and EFL is the focal length of the optical imaging lens.

8. The optical imaging lens according to claim 1, wherein, The optical imaging lens satisfies the following condition: 0.43≤R1 / F1≤0.63; Wherein, R1 is the radius of curvature of the object side of the first lens at the optical axis, and F1 is the focal length of the first lens.

9. The optical imaging lens according to claim 1, wherein, The optical imaging lens further includes a prism disposed along the optical axis between the fourth lens and the imaging surface. The prism is used to guide at least a portion of the light rays emitted from the fourth lens to the imaging surface. The optical imaging lens satisfies the following condition: 0.67≤L / TTL≤0.87; Where L is the geometric path of light in the prism, and TTL is the distance on the optical axis from the object side of the first lens to the imaging surface.

10. The optical imaging lens according to claim 1, wherein, The optical imaging lens further includes a prism disposed along the optical axis between the fourth lens and the imaging surface. The prism has a first surface. The first lens, the second lens, the third lens, and the fourth lens are coaxially arranged. The fourth lens and the imaging surface are both located on the same side as the first surface of the prism and are opposite to the first surface. At least a portion of the light emitted from the fourth lens can enter the prism from the first surface and, after at least one reflection in the prism, exit from the first surface onto the imaging surface.

11. The optical imaging lens according to claim 10, wherein, The prism also has a second reflecting surface and a third reflecting surface. The second reflecting surface is inclined to the first surface and is opposite to the fourth lens in the axial direction of the fourth lens. The third reflecting surface is inclined to the first surface and is opposite to the imaging surface in the perpendicular direction of the imaging surface. Light rays entering the prism from the first surface are reflected by at least the second reflecting surface and the third reflecting surface before exiting from the first surface.

12. The optical imaging lens according to claim 11, wherein, The prism also has a fourth reflecting surface opposite to the first surface and located between the second reflecting surface and the third reflecting surface. Light rays incident on the prism from the first surface can be reflected sequentially by the second reflecting surface, the first surface, the fourth reflecting surface, the first surface, and the third reflecting surface before exiting from the first surface.

13. The optical imaging lens according to claim 1, wherein, The optical imaging lens also includes an aperture stop, which is located on the object side of the first lens.

14. The optical imaging lens according to claim 1, wherein, The optical imaging lens also includes a filter element, which is disposed between the fourth lens and the imaging surface.

15. A camera module, comprising an image sensor and an optical imaging lens as described in any one of claims 1-14, wherein the image sensor is disposed at the imaging surface of the optical imaging lens.

16. The camera module according to claim 15, wherein, The optical imaging lens further includes a prism disposed along the optical axis between the fourth lens and the imaging surface. The prism has a first surface. The first lens, the second lens, the third lens, and the fourth lens are coaxially arranged. The fourth lens and the imaging surface are both located on the same side as the first surface of the prism and are opposite to the first surface. At least a portion of the light emitted from the fourth lens can enter the prism from the first surface and, after at least one reflection in the prism, exit from the first surface onto the imaging surface. The camera module further includes a focus driving element and an image stabilization driving element. The focus driving element is used to drive the fourth lens to move along the optical axis between the third lens and the first surface. The image stabilization driving element is used to drive the image sensor to move on a plane perpendicular to the imaging surface.

17. A camera module comprising an optical imaging lens and an image sensor, wherein the optical imaging lens comprises a lens and a prism, the prism having a first surface, a second reflecting surface and a third reflecting surface, the lens and the image sensor being located on one side of the first surface of the prism and opposite to the first surface, the second reflecting surface being inclined to the first surface and opposite to the lens in the axial direction of the lens, the third reflecting surface being inclined to the first surface and opposite to the image sensor in the perpendicular direction of the imaging plane of the optical imaging lens, wherein at least a portion of the light emitted from the lens can enter the prism from the first surface, and after being reflected by the second reflecting surface and the third reflecting surface, exit from the first surface to the image sensor.

18. The camera module according to claim 17, wherein, The prism also has a fourth reflecting surface opposite to the first surface and located between the second reflecting surface and the third reflecting surface. Light rays incident on the prism from the first surface can be reflected sequentially by the second reflecting surface, the first surface, the fourth reflecting surface, the first surface, and the third reflecting surface before exiting from the first surface.

19. The camera module according to claim 17, wherein, The optical imaging lens includes multiple lenses, wherein the lens closest to the prism is configured to be movable along the optical axis between the remaining lenses and the prism.

20. The camera module according to claim 17, wherein, The optical imaging lens satisfies the following condition: 0.67≤L / TTL≤0.87; Where L is the geometric path of light in the prism, and TTL is the distance on the optical axis from the object side of the lens closest to the object side of the optical imaging lens to the imaging surface of the optical imaging lens.

21. An electronic device comprising a camera module as described in any one of claims 15-20.

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