Camera module and electronic device

Abstract

The application discloses a camera module and an electronic device. The camera module comprises a lens assembly, a reflecting element and an image sensor. The reflecting element can reflect light received by the lens assembly to the image sensor to achieve the effect of light path folding, thereby reducing the size of the camera module in the thickness direction. Furthermore, the image sensor and the lens assembly are arranged on the same side of the reflecting element, which can reduce the size of the camera module in the length direction, thereby effectively balancing the size requirements of the camera module in the thickness direction and the length direction, and improving the applicability of the camera module to electronic devices of various sizes.

Description

Technical Field

[0001] This application relates to the field of camera technology, and in particular to a camera module and electronic device. Background Technology

[0002] A camera module is a module used to capture images.

[0003] Current camera modules can reduce the overall thickness of electronic devices by rotating the optical path of incident light by 90 degrees, thus converting the thickness dimension of the camera module into the length dimension.

[0004] However, when using a telephoto camera module as described above, the size of the camera module in the length direction will be further increased, resulting in a larger width for electronic devices that use this camera module. Summary of the Invention

[0005] This application provides an embodiment of the technical solution, which is as follows:

[0006] According to one aspect of this application, a camera module is provided, the camera module comprising: a lens assembly, a reflective element, and an image sensor;

[0007] The lens assembly includes: a first lens group and a second lens group arranged along a first direction, each of the first lens group and the second lens group including at least one lens, the second lens group being located on the side of the first lens group away from the object side, and the second lens group being movable along the first direction;

[0008] The reflective element is located on the side of the second lens group away from the first lens group, and the side of the reflective element facing the lens assembly has a first working surface;

[0009] The image sensor and the lens assembly are located on the same side of the reflective element in the first direction, and the light-receiving surface of the image sensor faces the first working surface;

[0010] The reflective element is used to reflect the light received by the lens assembly to the image sensor.

[0011] Optionally, the reflective element has a second working surface and a third working surface on the side away from the lens assembly and the image sensor, with the two sides of the first working surface connected to one side of the second working surface and one side of the third working surface, respectively, and the other side of the second working surface connected to the other side of the third working surface.

[0012] The orthographic projection of the lens assembly on the first working surface overlaps with the orthographic projection of the second working surface on the first working surface, and the orthographic projection of the image sensor on the first working surface overlaps with the orthographic projection of the third working surface on the first working surface.

[0013] Specifically, after the light received by the lens assembly passes through the first working surface and enters the interior of the reflective element, it undergoes a first reflection through the second working surface and is reflected back to the first working surface, a second reflection through the first working surface and is reflected back to the third working surface, a third reflection through the third working surface and is reflected back to the first working surface, and finally exits through the first working surface to the image sensor.

[0014] Optionally, the first working surface is perpendicular to the central optical axis of the lens assembly, and the angle between the second working surface and the third working surface is an obtuse angle.

[0015] Optionally, the light-receiving surface of the image sensor is parallel to the first working surface;

[0016] Alternatively, the light-receiving surface of the image sensor intersects with the first working surface.

[0017] Optionally, both the second working surface and the third working surface have a reflective film.

[0018] Optionally, the first lens group includes: a first lens, a second lens, and a third lens arranged sequentially along the first direction, wherein the first lens and the second lens are both positive lenses, and the third lens is a negative lens;

[0019] The second lens group includes a fourth lens and a fifth lens arranged sequentially along the first direction, wherein the fourth lens is a negative lens and the fifth lens is a positive lens.

[0020] Optionally, the camera module satisfies: TTL / IH ≥ 2.716;

[0021] Wherein, IH is the diagonal dimension of the image sensor, and TTL is the total length of the optical system of the camera module.

[0022] Optionally, the camera module satisfies: 0.07≤IH / (TTL*F#)≤0.18;

[0023] Wherein, IH is the diagonal dimension of the image sensor, TTL is the total length of the optical system of the camera module, and F# is the aperture number of the camera module.

[0024] Optionally, the focal length of the first lens group satisfies: F / F1≤1.9;

[0025] The focal length of the second lens group satisfies: F / F2 ≤ -1.5;

[0026] Wherein, F is the focal length of the camera module, F1 is the focal length of the first lens group, and F2 is the focal length of the second lens group.

[0027] Optionally, the third lens satisfies: -0.6≤(R5-R6) / (R5+R6)≤0; where R5 is the radius of curvature of the side of the third lens facing the object side, and R6 is the radius of curvature of the side of the third lens away from the object side.

[0028] The fourth lens satisfies: -1.18≤(R7-R8) / (R7+R8)≤0; where R7 is the radius of curvature of the side of the fourth lens facing the object, and R8 is the radius of curvature of the side of the fourth lens away from the object.

[0029] Optionally, the first lens group includes a sixth lens and a seventh lens arranged sequentially along the first direction, wherein the sixth lens and the seventh lens are both positive lenses;

[0030] The second lens group includes an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the first direction, wherein the eighth lens, the ninth lens, and the tenth lens are all negative lenses.

[0031] Optionally, the camera module satisfies: TTL / IH ≥ 2.8;

[0032] Wherein, IH is the diagonal dimension of the image sensor, and TTL is the total length of the optical system of the camera module.

[0033] Optionally, the camera module satisfies: 0.09≤IH / (TTL*F#)≤0.149;

[0034] Wherein, IH is the diagonal dimension of the image sensor, TTL is the total length of the optical system of the camera module, and F# is the aperture number of the camera module.

[0035] Optionally, the focal length of the first lens group satisfies: F / F1≤2.3;

[0036] The focal length of the second lens group satisfies: F / F2 ≤ -1.8;

[0037] Wherein, F is the focal length of the camera module, F1 is the focal length of the first lens group, and F2 is the focal length of the second lens group.

[0038] Optionally, the eighth lens satisfies: 0≤(R15-R16) / (R15+R16)≤2.33; where R15 is the radius of curvature of the side of the eighth lens facing the object side, and R16 is the radius of curvature of the side of the eighth lens away from the object side.

[0039] The ninth lens satisfies: -0.592≤(R17-R18) / (R17+R18)≤0; where R17 is the radius of curvature of the side of the ninth lens facing the object side, and R18 is the radius of curvature of the side of the ninth lens away from the object side.

[0040] The tenth lens satisfies: 0≤(R19-R20) / (R19+R20)≤0.087; where R19 is the radius of curvature of the side of the tenth lens facing the object side, and R20 is the radius of curvature of the side of the tenth lens away from the object side.

[0041] On the other hand, an electronic device is provided, the electronic device comprising: any of the above-described camera modules.

[0042] The beneficial effects of the technical solutions provided in this application include at least the following:

[0043] The camera module provided in this application includes a reflective element that reflects light received by the lens assembly to the image sensor, achieving an optical path folding effect and thus reducing the size of the camera module in the thickness direction. Furthermore, this application places the image sensor and the lens assembly on the same side of the reflective element, which reduces the size of the camera module in the length direction. This effectively balances the size requirements of the camera module in both the thickness and length directions, thereby improving the applicability of the camera module to electronic devices of various sizes. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a top view structural diagram of a camera module provided in an embodiment of this application;

[0046] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the provided camera module at point B1-B1;

[0047] Figure 3 yes Figure 1 Another cross-sectional view of the provided camera module at B1-B1;

[0048] Figure 4 This is a schematic diagram of another camera module provided in an embodiment of this application;

[0049] Figure 5 This is a schematic diagram of another camera module provided in an embodiment of this application;

[0050] Figure 6 yes Figure 4 A scattering curve of the provided camera module;

[0051] Figure 7 yes Figure 4 A distortion curve diagram of the provided camera module;

[0052] Figure 8 yes Figure 4 A vertical axis chromatic difference curve diagram of the provided camera module;

[0053] Figure 9 yes Figure 4 A schematic diagram of a modulation transfer function for a provided camera module;

[0054] Figure 10 yes Figure 4 A schematic diagram of another modulation transfer function for the provided camera module;

[0055] Figure 11 This is a schematic diagram of another camera module provided in an embodiment of this application;

[0056] Figure 12 This is a schematic diagram of another camera module provided in an embodiment of this application;

[0057] Figure 13 yes Figure 11 A scattering curve of the provided camera module;

[0058] Figure 14 yes Figure 11 A distortion curve diagram of the provided camera module;

[0059] Figure 15 yes Figure 11 A vertical axis chromatic difference curve diagram of the provided camera module;

[0060] Figure 16 yes Figure 11 A schematic diagram of a modulation transfer function for a provided camera module;

[0061] Figure 17 yes Figure 11 A schematic diagram of another modulation transfer function for the provided camera module.

[0062] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0064] This application provides a camera module; please refer to... Figure 1 , Figure 1 This is a top view structural diagram of a camera module provided in an embodiment of this application. Figure 2 yes Figure 1 A cross-sectional schematic diagram of the provided camera module at point B1-B1. Figure 3 yes Figure 1 Another cross-sectional view of the provided camera module at B1-B1. In this embodiment, the camera module 00 can be applied to various electronic devices A with camera functions, including: smartphones, tablets, advanced driver assistance cameras, smart home monitoring systems, multi-lens devices, wearable devices, digital cameras, cloud-based photography equipment, human-computer interaction platforms, etc. For example, Figure 1 Take electronic device A as an example, which is a smartphone.

[0065] The camera module 00 includes: a lens assembly 10, a reflective element 20, and an image sensor 30.

[0066] The lens assembly 10 includes a first lens group 11 and a second lens group 12 arranged along a first direction X. The first lens group 11 and the second lens group 12 each include at least one lens. The second lens group 12 is located on the side of the first lens group 11 away from the object side. The second lens group 12 is movable along the first direction X.

[0067] Lens assembly 10 is used to receive light reflected from the object to be photographed. Here, the object side refers to the side where the object to be photographed is located; that is, the incident light from the object first passes through the first lens group 11 and then through the second lens group 12. The position of the first lens group 11 can be fixed, while the position of the second lens group 12 can be variable, thus enabling zoom functionality by moving the second lens group 12. Figure 2 and Figure 3 For example, Figure 2 Corresponding to the case where the subject is at infinity, Figure 3 Corresponding to the case where the subject is at close range, when the camera module 00 is used to perform a focusing operation from an object at infinity to a close-up object, the first lens group 11 remains stationary, while the second lens group 12 moves away from the first lens group 11 in the first direction X, so as to achieve a larger magnification for the close-up object, thereby enabling macro photography. For example, the material of the lens in the lens assembly 10 may include light-transmitting materials such as glass or resin.

[0068] It should be noted that the number of lenses in the first lens group 11 and the second lens group 12 can be one or more. Figure 2 and Figure 3 An exemplary embodiment is illustrated in which the first lens group 11 includes three lenses and the second lens group 12 includes two lenses, but this application is not limited thereto.

[0069] The reflecting element 20 is located on the side of the second lens group 12 away from the first lens group 11, and has a first working surface 21 on the side facing the lens assembly 10. The reflecting element 20 is used to reflect light received by the lens assembly 10 to the image sensor 30. Here, the reflecting element 20 is used to reflect incident light to achieve folding of the optical path. Since the first working surface 21 of the reflecting element 20 faces the lens assembly 10, it can serve as the light-incident surface of the light received by the lens assembly 10. Furthermore, since the first working surface 21 of the reflecting element 20 faces the image sensor 30, it can also serve as the light-exit surface of the light after multiple reflections. For example, the reflecting element 20 may include a prism, and the material of the prism may include a light-transmitting material such as glass or resin.

[0070] The image sensor 30 and the lens assembly 10 are located on the same side of the reflective element 20 in the first direction X, and the light-receiving surface of the image sensor 30 faces the first working surface 21. Here, the image sensor 30 is used to detect the light signal received by the light-receiving surface and generate an image signal accordingly, based on which an image can be generated.

[0071] By folding the optical path using the reflective element 20, both the light-incident and light-exit surfaces can be the first working surface 21, allowing the image sensor 30 and lens assembly 10 to be positioned on the same side of the reflective element 20. This not only avoids the problem of increased thickness when the image sensor 30 and lens assembly 10 are located on opposite sides of the reflective element 20 in the first direction X, but also avoids the problem of increased length when the image sensor 30 is positioned on one side of the reflective element in the second direction Y, thus effectively balancing the size requirements of the camera module 00 in both the thickness and length directions.

[0072] It should be noted that the second direction Y can be perpendicular to the first direction X. The first direction X can be the thickness direction of the camera module 00, and the second direction Y can be the length direction of the camera module 00.

[0073] In summary, this application provides a camera module in which a reflective element reflects light received by the lens assembly to the image sensor, achieving an optical path folding effect and thus reducing the size of the camera module in the thickness direction. Furthermore, this application places the image sensor and the lens assembly on the same side of the reflective element, which reduces the size of the camera module in the length direction. This effectively balances the size requirements of the camera module in both the thickness and length directions, thereby improving the applicability of the camera module to electronic devices of various sizes.

[0074] The optical path of the camera module 00 is described below using an exemplary embodiment:

[0075] Please refer to Figure 2 and Figure 3 The reflective element 20 has a second working surface 22 and a third working surface 23 on the side away from the lens assembly 10 and the image sensor 30. Two sides of the first working surface 21 are connected to one side of the second working surface 22 and one side of the third working surface 23, respectively, and the other side of the second working surface 22 is connected to the other side of the third working surface 23. For example, the reflective element 20 can be... Figure 2 and Figure 3 The prism shown can utilize the difference between its refractive index and that of air to reflect light rays with an incident angle greater than the critical angle, thereby changing the light path.

[0076] The orthographic projection of the lens assembly 10 on the first working surface 21 overlaps with the orthographic projection of the second working surface 22 on the first working surface 21, and the orthographic projection of the image sensor 30 on the first working surface 21 overlaps with the orthographic projection of the third working surface 23 on the first working surface 21. That is, the lens assembly 10 and the image sensor 30 are arranged at intervals in the second direction Y to ensure that the light received by the lens assembly 10 can enter the reflective element 20, and after the reflective element 20 reflects the light, it can reach the light-receiving surface of the image sensor 30.

[0077] In this process, light received by the lens assembly 10 enters the reflective element 20 through the first working surface 21, undergoes a first reflection through the second working surface 22 and is reflected back to the first working surface 21, undergoes a second reflection through the first working surface 21 and is reflected back to the third working surface 23, undergoes a third reflection through the third working surface 23 and is reflected back to the first working surface 21, and is then emitted from the first working surface 21 to the image sensor 30. That is, the reflective element 20 can reflect the incident light three times to ensure that the emitted light can be focused on the light-receiving surface of the image sensor 30. Without increasing the overall size of the camera module 00, the folding effect of the reflective element 20 on the optical path can effectively improve the focal length and total track length (TTL) of the camera module 00.

[0078] It should be noted that, in order to clearly illustrate the optical path, Figure 2 and Figure 3 Each example uses a single ray of light as an illustration. The optical paths of other rays are similar to those of the illustrated rays, and will not be elaborated upon further in this application.

[0079] Optionally, the first working surface 21 is perpendicular to the central optical axis of the lens assembly 10, and the angle between the second working surface 22 and the third working surface 23 is an obtuse angle. Here, the first direction X can be parallel to the central optical axis of the lens assembly 10, and the second direction Y can be parallel to the first working surface 21. By setting the angle between the second working surface 22 and the third working surface 23 to an obtuse angle, not only can the optical path be adjusted to avoid interfering with the image sensor 30's sensing of light, but the size of the reflective component 20 in the first direction X can also be reduced, thereby reducing the size of the camera module 00 in the thickness direction.

[0080] For some possible implementations, please refer to Figure 4 , Figure 4 This is a schematic diagram of another camera module structure provided in this application embodiment. The camera module 00 may further include a filter 40 and an aperture 50. In the first direction X, the filter 40 is located between the image sensor 30 and the reflective element 20. The filter 40 can filter out at least a portion of infrared light, preventing infrared light from being projected onto the image sensor 30 and causing inaccurate image colors, thereby effectively improving the resolution and color reproduction of the camera module 00. The aperture 50 may be located on the object side of the lens assembly 10, thus limiting and controlling the amount of light entering the lens assembly 10.

[0081] In this application embodiment, the image sensor 30 is configured in several ways:

[0082] Please refer to the first scenario. Figure 4The light-receiving surface of the image sensor 30 is parallel to the first working surface 21. That is, the image sensor 30 is upright, which makes it easier for light to be received by the image sensor 30 after being reflected by the reflective element 12.

[0083] Please refer to the second scenario. Figure 5 , Figure 5 This is a schematic diagram of another camera module structure provided in this application embodiment, in which the light-receiving surface of the image sensor 30 intersects with the first working surface 21. That is, the image sensor 30 is obliquely placed, which can avoid the size of the image sensor 30 being too limited by the size of the reflective element 20, thereby facilitating the setting of a larger image sensor 30 to improve the imaging quality without increasing the overall size of the camera module 00.

[0084] For example, for the reflective element 20 in the second case, the size of the orthographic projection of the second working surface 22 in the second direction Y can be smaller than the size of the orthographic projection of the third working surface 23 in the second direction Y, so as to ensure that the light can be received by the image sensor 30.

[0085] In addition, in both cases, the plane on which the infrared filter 40 is located can be parallel to the light-receiving surface of the image sensor. That is, the infrared filter 40 and the image sensor 30 are either upright or obliquely positioned together, which can improve the filtering effect of the infrared filter 40.

[0086] Optionally, both the second working surface 22 and the third working surface 23 have reflective films. Since the prism can reflect light with an incident angle greater than the critical angle, and the reflective film can reflect light with a smaller incident angle, the amount of light that can be reflected can be increased, thereby improving the imaging quality of the camera module 00.

[0087] In this application, the lens assembly has a significant impact on the optical performance of the camera module. The lens assembly is described below with two exemplary embodiments:

[0088] In a first exemplary embodiment, please refer to Figure 2 and Figure 3 The first lens group 11 includes a first lens G1, a second lens G2, and a third lens G3 arranged sequentially along the first direction X. The first lens G1 and the second lens G2 are both positive lenses, and the third lens G3 is a negative lens. A positive lens has a positive optical power and thus converges light rays, while a negative lens has a negative optical power and thus diverges light rays.

[0089] The second lens group 12 includes a fourth lens G4 and a fifth lens G5 arranged sequentially along the first direction X, wherein the fourth lens G4 is a negative lens and the fifth lens G5 is a positive lens.

[0090] For the camera module 00 provided in the first exemplary embodiment, the positions of the first lens G1, the second lens G2 and the third lens G3 can be fixed, while the fourth lens G4 and the fifth lens G5 can move along the first direction X, so that the zoom function can be achieved by moving the fourth lens G4 and the fifth lens G5.

[0091] It should be noted that the first lens group 11 has a positive optical power, which can be used to converge the incident light rays and transmit them to the second lens group 12. The second lens group 12 has a negative optical power, which can transmit the incident light rays converged by the first lens group 11 to the reflective element 20.

[0092] Optionally, the focal length of the first lens group 11 satisfies: F / F1≤1.9.

[0093] The focal length of the second lens group 12 satisfies: F / F2≤-1.5.

[0094] Where F is the focal length of camera module 00, F1 is the focal length of the first lens group 11, and F2 is the focal length of the second lens group 12.

[0095] It should be noted that the first lens group 11 has a positive optical power as a whole, so its focal length F1 is a positive value, meaning F / F1 is greater than 0. The second lens group 12 has a negative optical power as a whole, so its focal length F2 should be a negative value.

[0096] Optionally, the third lens G3 satisfies: -0.6≤(R5-R6) / (R5+R6)≤0. Wherein, R5 is the radius of curvature of the side of the third lens G3 facing the object side, and R6 is the radius of curvature of the side of the third lens G3 away from the object side.

[0097] The fourth lens G4 satisfies: -1.18≤(R7-R8) / (R7+R8)≤0. Where R7 is the radius of curvature of the side of the fourth lens G4 facing the object side, and R8 is the radius of curvature of the side of the fourth lens G4 away from the object side.

[0098] Here, the side of the lens facing the object side is called the object-side surface, and the side facing away from the object side is called the image-side surface. The radii of curvature of the object-side and image-side surfaces reflect the degree of curvature of the object-side and image-side surfaces, thus determining the refraction of light by the lens. For a positive lens, the difference in radii of curvature between the object-side and image-side surfaces is small, while for a negative lens, the difference is large. Therefore, this application specifies the radii of curvature of the third lens G3 and the fourth lens G4.

[0099] Optionally, camera module 00 satisfies: TTL / IH ≥ 2.716.

[0100] Wherein, IH is the diagonal size of the image sensor 30, specifically half the diagonal length of the effective pixel area on the photosensitive chip of the image sensor 30. A larger image sensor 30 has better light acquisition capabilities, significantly improving image detail and reducing noise, resulting in clearer and cleaner photos. A larger image sensor 30 can also record more image information, retaining richer details, thus providing higher dynamic range and color depth, and enabling better exposure and detail reproduction even in scenes with complex lighting conditions. When shooting portraits, still life close-ups, etc., a larger image sensor 30 can provide a shallower depth of field, making the background more blurred and the subject more prominent, enhancing the sense of depth in the photo. Therefore, the larger the size of the image sensor 30, the better the image quality. For example, in the camera module 00 provided in the first exemplary embodiment, the diagonal size IH of the image sensor 30 can be 1 / 2.0 inch to achieve a full-image height of 8.7 meters or more.

[0101] TTL refers to the total length of the optical system of the camera module 00. The total length of the optical system is the distance along the optical axis between the front vertex of the object-facing surface of the first lens G1 and the image plane at the image sensor 30. Therefore, a larger total length of the optical system increases the size of the camera module 00. This application achieves an optical path folding effect by setting the reflective element 20, thereby increasing the total length of the optical system of the camera module 00 without increasing its size. This allows the camera module 00 to have a greater image magnification, i.e., to achieve a high-magnification telephoto function.

[0102] Optionally, the camera module 00 satisfies: 0.07≤IH / (TTL*F#)≤0.18.

[0103] Where IH is the diagonal dimension of the image sensor 30, TTL is the total length of the optical system of the camera module 00, and F# is the aperture number of the camera module 00. The aperture number refers to the ratio between the focal length of the camera module 00 and the diameter of the aperture stop 40. Therefore, at a given focal length, a lower aperture number allows the camera module 00 to capture more light to improve image quality and achieve a wider aperture opening to increase the field of view. For example, the aperture number of the camera module 00 provided in the first exemplary embodiment can be less than or equal to 2.5, resulting in a larger amount of light entering the camera module 00 and better image quality.

[0104] Based on the range of the above parameters, for the first exemplary embodiment, Tables 1 and 2 show the surface type, radius of curvature, spacing, refractive index, and dispersion coefficient of each lens in the lens assembly 10. Table 1 corresponds to the case where the subject is at infinity, and Table 2 corresponds to the case where the subject is at close range. That is, the camera module 00 can be used to capture distant scenes or macro scenes. For example, the macro function distance of the camera module provided in the first exemplary embodiment is 25 cm.

[0105] It should be noted that, as shown in Tables 1 and 2, S0 is the object plane, which simplifies the object to a point on the optical axis. The object plane refers to the plane passing through this point and perpendicular to the optical axis. S1 is the plane where the aperture is located, M1 is the object-side plane of the first lens G1, M2 is the image-side plane of the first lens G1, M3 is the object-side plane of the second lens G2, M4 is the image-side plane of the second lens G2, M5 is the object-side plane of the third lens G3, M6 is the image-side plane of the third lens G3, M7 is the object-side plane of the fourth lens G4, M8 is the image-side plane of the fourth lens G4, M9 is the object-side plane of the fifth lens G5, M10 is the image-side plane of the fifth lens G5, S2 is the plane where the filter 40 is located, and S3 is the light-receiving surface of the image sensor 30.

[0106] Table 1

[0107]

[0108] Table 2

[0109]

[0110] In the first exemplary embodiment, the object-side and image-side surfaces of each lens in the lens assembly 10 can both be aspherical. For example, the object-side and image-side surfaces of each lens can be of type Qcon aspherical, which has a more stable surface structure, is less prone to abrupt changes, and is less likely to cause abnormal light patterns. The surface shape of the Qcon aspherical satisfies:

[0111]

[0112] Where z is the depth of the aspherical surface, r is the distance between a point on the aspherical surface and the optical axis, k is the conic coefficient, and r n For normalized curvature, u is r / r n a m Q is the m-th order aspherical coefficient; m Let be the m-th order Qcon polynomial.

[0113] The radius of curvature reflects the curvature of a lens surface. A positive radius of curvature indicates that the surface is convex towards the object side, while a negative radius of curvature indicates that the surface is convex towards the image side. Spacing represents the distance between the current surface and the next surface on the optical axis. A positive spacing indicates that the current surface is on the object side of the next surface, while a negative spacing indicates that the current surface is on the image side of the next surface. The refractive index reflects the lens's ability to refract light. The dispersion coefficient is the ratio of the differences in the refractive index of the lens at different wavelengths. The larger the dispersion coefficient, the smaller the dispersion phenomenon of the lens, meaning that different colors of light can be better focused at the same focal point after passing through the lens, thereby reducing color fringes at the image edge and improving image sharpness.

[0114] As shown in Tables 1 and 2, when the camera module 00 performs the focusing operation from an object at infinity to a close-up object, the distance corresponding to the image side M6 of the third lens G3 increases, and the distance corresponding to the image side M10 of the fifth lens G5 decreases. That is, the second lens group 12 as a whole moves away from the first lens group 11 in the first direction X, so as to achieve a larger magnification for close-up objects, thereby realizing the function of macro shooting.

[0115] The specific optical parameters of the camera module 00 provided in the first exemplary embodiment are shown in Table 3. The effective focal length (EFL) is the distance from the lens center to the focal point; the effective focal length in Table 3 refers to the overall effective focal length of the lens assembly 10. The field of view (FOV) is the angle formed by the two edges of the maximum range through which the image of the target object can pass through the lens. The size of the FOV determines the field of view of the camera module 00; a larger FOV results in a larger field of view. It should be noted that this is merely an example, and this application is not limited thereto.

[0116] Table 3

[0117] Half-diagonal dimension (mm) 4.352 Effective focal length (mm) 20.28 Field of view (degrees) 22.8 Aperture 2.5 Total length of optical system (mm) 24.45

[0118] This application also tests the field curvature, distortion, lateral chromatic aberration, and modulation transfer function of the camera module provided in the first exemplary embodiment. Please refer to... Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 , Figure 6 yes Figure 4 A scattering curve diagram of the provided camera module. Figure 7 yes Figure 4 A distortion curve diagram of the provided camera module. Figure 8 yes Figure 4 A vertical axis chromatic difference curve diagram of the provided camera module. Figure 9 yes Figure 4 A schematic diagram of a modulation transfer function for a provided camera module. Figure 10 yes Figure 4 A schematic diagram of another modulation transfer function for the provided camera module.

[0119] like Figure 6 As shown, the astigmatism curve is used to represent the deviation of the convergence point of a fine beam from the ideal imaging plane under different fields of view; that is, the field curvature. In the astigmatism field curve, the horizontal axis represents the focal offset value in millimeters, and the vertical axis represents the image height in millimeters. Curve L11 is the astigmatism curve for a meridional beam. The meridional plane is the plane formed by the principal ray emitted from an object point outside the principal axis of the optical system and the principal axis of the optical system. Rays within the meridional plane are collectively called meridional beams. Curve L12 is the astigmatism curve for a sagittal beam. The sagittal plane is the plane passing through the principal ray emitted from an object point outside the principal axis of the optical system and perpendicular to the meridional plane. Rays within the sagittal plane are collectively called sagittal beams. Figure 6 It can be seen that the absolute values ​​of the field curvature corresponding to the beams in both directions are less than 0.08, which means that the field curvature of the camera module is small and the imaging quality is high.

[0120] like Figure 7 As shown, the distortion curve is used to represent the relative deviation between the beam convergence point (actual image height) and the ideal image height at different fields of view. The horizontal axis of the distortion curve represents the distortion rate (%), and the vertical axis represents the image height, in millimeters. Figure 7 As can be seen, the distortion rate of the camera module provided in the first exemplary embodiment is less than 2%, which means that the distortion rate of the camera module is small, which can ensure that there is no obvious distortion in the image and the image quality is good.

[0121] like Figure 8 As shown, the transverse chromatic aberration curve is used to represent the difference in magnification for different colors of light. The horizontal axis of the transverse chromatic aberration curve represents the transverse chromatic aberration in micrometers, and the vertical axis represents the actual image height in millimeters. Curves L21, L22, L23, L24, L25, and L26 represent the transverse chromatic aberration curves for different wavelengths of light. Figure 8 It can be seen that the absolute value of the transverse chromatic difference of light of different wavelengths is less than 1.5, so the transverse chromatic difference of the camera module is small, which can improve the imaging quality of the camera module.

[0122] like Figure 9 and Figure 10 As shown, the modulation transfer function is used to represent the resolving power of the camera module, that is, the degree to which the camera module reproduces the subject. Among them, Figure 9 Corresponding to the case where the subject is at infinity, Figure 10This corresponds to the situation when the subject is at close range. The horizontal axis represents spatial frequency, which indicates the number of times the image function repeats itself per unit length, measured in cycles per millimeter (mm). The vertical axis represents contrast. Figure 9 The diagram shows the modulation transfer functions corresponding to different image heights. Each set of curves is further divided into two lines: the solid line represents the resolution of the camera module for radial lines (the lines are directed radially outward from the center of the sensor); the dashed line represents the resolution of the camera module for tangential lines (the lines are tangent to the concentric circles at the center of the sensor). Figure 10 The modulation transfer functions corresponding to multiple image heights are also shown, but will not be elaborated upon here.

[0123] Depend on Figure 9 It can be seen that, for the case where the subject is at infinity, the modulation transfer functions of multiple sets of the camera module are all greater than 0.6. Figure 10 It can be seen that when the subject is at close range, the modulation transfer function of the camera module is greater than 0.3 in most cases, which proves that the imaging quality of the camera module is good in both cases.

[0124] In the second exemplary embodiment, please refer to Figure 11 and Figure 12 , Figure 11 This is a schematic diagram of another camera module provided in an embodiment of this application. Figure 12 This is a schematic diagram of another camera module provided in an embodiment of this application. Figure 11 Corresponding to the case where the subject is at infinity, Figure 12 This corresponds to the situation where the subject is at close range. The first lens group 11 includes a sixth lens G6 and a seventh lens G7 arranged sequentially along the first direction X, both of which are positive lenses.

[0125] The second lens group 12 includes an eighth lens G8, a ninth lens, and a tenth lens G10 arranged sequentially along the first direction X, wherein the eighth lens G8, the ninth lens, and the tenth lens G10 are all negative lenses.

[0126] In the camera module 00 provided in the second exemplary embodiment, the positions of the sixth lens G6 and the seventh lens G7 can be fixed, while the eighth lens G8, the ninth lens and the tenth lens G10 can move along the first direction X, thus enabling zoom functionality by moving the eighth lens G8, the ninth lens and the tenth lens G10.

[0127] It should be noted that the first lens group 11 as a whole has positive optical power, and each lens in the first lens group 11 also has positive optical power, which can be used to converge the incident light rays and transmit them to the second lens group 12. The second lens group 12 as a whole has negative optical power, and each lens in the second lens group 12 also has negative optical power, which can transmit the incident light rays converged by the first lens group 11 to the reflecting element 20.

[0128] Optionally, the focal length of the first lens group 11 satisfies: F / F1≤2.3.

[0129] The focal length of the second lens group 12 satisfies: F / F2≤-1.8.

[0130] Where F is the focal length of camera module 00, F1 is the focal length of the first lens group 11, and F2 is the focal length of the second lens group 12.

[0131] It should be noted that the first lens group 11 has a positive optical power as a whole, so its focal length F1 is a positive value, meaning F / F1 is greater than 0. The second lens group 12 has a negative optical power as a whole, so its focal length F2 should be a negative value.

[0132] Optionally, the eighth lens G8 satisfies: 0 ≤ (R15 - R16) / (R15 + R16) ≤ 2.33. Wherein, R15 is the radius of curvature of the side of the eighth lens G8 facing the object side, and R16 is the radius of curvature of the side of the eighth lens G8 away from the object side.

[0133] The ninth lens G9 satisfies: -0.592≤(R17-R18) / (R17+R18)≤0. Where R17 is the radius of curvature of the side of the ninth lens G9 facing the object side, and R18 is the radius of curvature of the side of the ninth lens G9 away from the object side.

[0134] The tenth lens G10 satisfies: 0 ≤ (R19 - R20) / (R19 + R20) ≤ 0.087. Where R19 is the radius of curvature of the side of the tenth lens G10 facing the object side, and R20 is the radius of curvature of the side of the tenth lens G10 away from the object side.

[0135] Here, the object-side and image-side curvature radii differ significantly. This application defines the curvature radii of the negative lenses (eighth lens G8, ninth lens G9, and ninth lens G9) in the lens assembly 10.

[0136] Optionally, camera module 00 satisfies: TTL / IH ≥ 2.8.

[0137] Wherein, IH is the diagonal size of the image sensor 30, and TTL is the total length of the optical system of the camera module 00. For example, in the camera module 00 provided in the second exemplary embodiment, the diagonal size IH of the image sensor 30 can be 1 / 2.55 inch to achieve a holographic height of 7 or more.

[0138] Optionally, the camera module 00 satisfies: 0.09≤IH / (TTL*F#)≤0.149.

[0139] Wherein, IH is the diagonal dimension of the image sensor 30, TTL is the total length of the optical system of the camera module 00, and F# is the aperture number of the camera module 00. For example, in the second exemplary embodiment, the aperture number of the camera module 00 can be less than or equal to 2.5, resulting in a larger amount of light entering the camera module 00 and better image quality.

[0140] Based on the range of the parameters described above, for the second exemplary embodiment, Tables 4 and 5 show the surface type, radius of curvature, spacing, refractive index, and dispersion coefficient of each lens in the lens assembly 10. Table 4 corresponds to the case where the subject is at infinity, and Table 5 corresponds to the case where the subject is at close range. For example, the macro function of the camera module provided in the second exemplary embodiment has a distance of 25 cm.

[0141] In the second exemplary embodiment, the object-side and image-side surfaces of each lens in the lens assembly 10 can both be aspherical, for example, Qcon aspherical.

[0142] As shown in Tables 4 and 5, when the camera module 00 performs the focusing operation from an object at infinity to a close-up object, the distance corresponding to the image side M14 of the seventh lens G7 increases, and the distance corresponding to the image side M20 of the tenth lens G10 decreases. That is, the second lens group 12 as a whole moves away from the first lens group 11 in the first direction X, so as to achieve a larger magnification for close-up objects, thereby realizing the function of macro shooting.

[0143] Table 4

[0144]

[0145] Table 5

[0146]

[0147] Table 6

[0148] Half-diagonal dimension (mm) 3.52 Effective focal length (mm) 17 Field of view (degrees) 21.4 Aperture 2.483 Total length of optical system (mm) 23.3

[0149] The specific optical parameters of the camera module 00 provided in the second exemplary embodiment are shown in Table 6. It should be noted that this is only an example, and the present application is not limited thereto.

[0150] This application also tests the field curvature, distortion, transverse chromatic aberration, and modulation transfer function of the camera module provided in the second exemplary embodiment. Please refer to... Figure 13 , Figure 14 , Figure 15 , Figure 16 and Figure 17 , Figure 13 yes Figure 11 A scattering curve diagram of the provided camera module. Figure 14 yes Figure 11 A distortion curve diagram of the provided camera module. Figure 15 yes Figure 11 A vertical axis chromatic difference curve diagram of the provided camera module. Figure 16 yes Figure 11 A schematic diagram of a modulation transfer function for a provided camera module. Figure 17 yes Figure 11 A schematic diagram of another modulation transfer function for the provided camera module.

[0151] like Figure 13 As shown, curve L31 is the astigmatism curve of the meridional beam, and curve L32 is the astigmatism curve of the sagittal beam. The absolute values ​​of the field curvatures corresponding to the beams in both directions are less than 0.05, indicating that the field curvature of the camera module is small and the imaging quality is high.

[0152] like Figure 14 As shown, the distortion rate of the camera module provided in the second exemplary embodiment is less than 2%. The low distortion rate of the camera module can ensure that there is no obvious distortion in the image and the image quality is good.

[0153] like Figure 15 As shown, curves L41, L42, L43, L44, L45, and L46 are the chromatic difference curves of different wavelengths of light. The absolute value of the chromatic difference of different wavelengths of light is less than 1, which means that the chromatic difference of the camera module is small, which can improve the imaging quality of the camera module.

[0154] like Figure 16 and Figure 17 As shown, the modulation transfer function is used to represent the resolving power of the camera module, that is, the degree to which the camera module reproduces the subject. Among them, Figure 16 Corresponding to the case where the subject is at infinity, Figure 17 This corresponds to the situation where the subject is at close range. Figure 16The diagram shows the modulation transfer functions corresponding to different image heights. Each set of curves is further divided into two lines: the solid line represents the resolution of the camera module for radial lines (the lines are directed radially outward from the center of the sensor); the dashed line represents the resolution of the camera module for tangential lines (the lines are tangent to the concentric circles at the center of the sensor). Figure 17 The modulation transfer functions corresponding to multiple image heights are also shown, but will not be elaborated upon here.

[0155] Depend on Figure 16 It can be seen that, for the case where the subject is at infinity, the modulation transfer functions of multiple sets of the camera module are all greater than 0.3. Figure 17 It can be seen that when the subject is at close range, the modulation transfer function of the camera module is greater than 0.3 in most cases, which proves that the imaging quality of the camera module is good in both cases.

[0156] In addition, Figure 11 and Figure 12 In the camera module 00 shown, the image sensor 30 is upright. Alternatively, the image sensor 30 can be angled. This avoids excessive limitation on the size of the image sensor 30 by the size of the reflective element 20, allowing for a larger image sensor 30 to improve image quality without increasing the overall size of the camera module 00.

[0157] In summary, this application provides a camera module in which a reflective element reflects light received by the lens assembly to the image sensor, achieving an optical path folding effect and thus reducing the size of the camera module in the thickness direction. Furthermore, this application places the image sensor and the lens assembly on the same side of the reflective element, which reduces the size of the camera module in the length direction. This effectively balances the size requirements of the camera module in both the thickness and length directions, thereby improving the applicability of the camera module to electronic devices of various sizes.

[0158] On the other hand, this application also provides an electronic device, which includes the camera module provided in any of the above embodiments. The electronic device may include: smartphones, tablets, advanced driver assistance cameras, smart home monitoring systems, multi-lens devices, wearable devices, digital cameras, cloud photography equipment, human-computer interaction platforms, and other devices with camera functions.

[0159] Since the electronic device includes the camera module provided in the above embodiments, it can also have a similar effect, that is, the size of the electronic device in the length direction can be reduced.

[0160] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0161] In this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" means two or more, unless otherwise expressly defined.

[0162] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A camera module, characterized in that, The camera module includes: a lens assembly, a reflective element, and an image sensor; The lens assembly includes: a first lens group and a second lens group arranged along a first direction, each of the first lens group and the second lens group including at least one lens, the second lens group being located on the side of the first lens group away from the object side, and the second lens group being movable along the first direction; The reflective element is located on the side of the second lens group away from the first lens group, and the side of the reflective element facing the lens assembly has a first working surface; The image sensor and the lens assembly are located on the same side of the reflective element in the first direction, and the light-receiving surface of the image sensor faces the first working surface; The reflective element is used to reflect the light received by the lens assembly to the image sensor.

2. The camera module according to claim 1, characterized in that, The reflective element has a second working surface and a third working surface on the side away from the lens assembly and the image sensor. The two sides of the first working surface are respectively connected to one side of the second working surface and one side of the third working surface, and the other side of the second working surface is connected to the other side of the third working surface. The orthographic projection of the lens assembly on the first working surface overlaps with the orthographic projection of the second working surface on the first working surface, and the orthographic projection of the image sensor on the first working surface overlaps with the orthographic projection of the third working surface on the first working surface. Specifically, after the light received by the lens assembly passes through the first working surface and enters the interior of the reflective element, it undergoes a first reflection through the second working surface and is reflected back to the first working surface, a second reflection through the first working surface and is reflected back to the third working surface, a third reflection through the third working surface and is reflected back to the first working surface, and finally exits through the first working surface to the image sensor.

3. The camera module according to claim 2, characterized in that, The first working surface is perpendicular to the central optical axis of the lens assembly, and the angle between the second working surface and the third working surface is an obtuse angle.

4. The camera module according to claim 2, characterized in that, The light-receiving surface of the image sensor is parallel to the first working surface; Alternatively, the light-receiving surface of the image sensor intersects with the first working surface.

5. The camera module according to any one of claims 2-4, characterized in that, Both the second working surface and the third working surface have a reflective film.

6. The camera module according to any one of claims 1-4, characterized in that, The first lens group includes: a first lens, a second lens, and a third lens arranged sequentially along the first direction, wherein the first lens and the second lens are both positive lenses, and the third lens is a negative lens; The second lens group includes a fourth lens and a fifth lens arranged sequentially along the first direction, wherein the fourth lens is a negative lens and the fifth lens is a positive lens.

7. The camera module according to claim 6, characterized in that, The camera module satisfies: TTL / IH ≥ 2.716; Wherein, IH is the diagonal dimension of the image sensor, and TTL is the total length of the optical system of the camera module.

8. The camera module according to claim 6, characterized in that, The camera module satisfies the following condition: 0.07 ≤ IH / (TTL*F#) ≤ 0.18; Wherein, IH is the diagonal dimension of the image sensor, TTL is the total length of the optical system of the camera module, and F# is the aperture number of the camera module.

9. The camera module according to claim 6, characterized in that, The focal length of the first lens group satisfies: F / F1≤1.9; The focal length of the second lens group satisfies: F / F2 ≤ -1.5; Wherein, F is the focal length of the camera module, F1 is the focal length of the first lens group, and F2 is the focal length of the second lens group.

10. The camera module according to claim 6, characterized in that, The third lens satisfies: -0.6≤(R5-R6) / (R5+R6)≤0; where R5 is the radius of curvature of the side of the third lens facing the object, and R6 is the radius of curvature of the side of the third lens away from the object. The fourth lens satisfies: -1.18≤(R7-R8) / (R7+R8)≤0; where R7 is the radius of curvature of the side of the fourth lens facing the object, and R8 is the radius of curvature of the side of the fourth lens away from the object.

11. The camera module according to any one of claims 1-4, characterized in that, The first lens group includes a sixth lens and a seventh lens arranged sequentially along the first direction, wherein both the sixth lens and the seventh lens are positive lenses; The second lens group includes an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the first direction, wherein the eighth lens, the ninth lens, and the tenth lens are all negative lenses.

12. The camera module according to claim 11, characterized in that, The camera module meets the following requirements: TTL / IH ≥ 2.8; Wherein, IH is the diagonal dimension of the image sensor, and TTL is the total length of the optical system of the camera module.

13. The camera module according to claim 11, characterized in that, The camera module satisfies: 0.09≤IH / (TTL*F#)≤0.149; Wherein, IH is the diagonal dimension of the image sensor, TTL is the total length of the optical system of the camera module, and F# is the aperture number of the camera module.

14. The camera module according to claim 11, characterized in that, The focal length of the first lens group satisfies: F / F1≤2.3; The focal length of the second lens group satisfies: F / F2 ≤ -1.8; Wherein, F is the focal length of the camera module, F1 is the focal length of the first lens group, and F2 is the focal length of the second lens group.

15. The camera module according to claim 11, characterized in that, The eighth lens satisfies: 0≤(R15-R16) / (R15+R16)≤2.33; where R15 is the radius of curvature of the side of the eighth lens facing the object side, and R16 is the radius of curvature of the side of the eighth lens away from the object side. The ninth lens satisfies: -0.592≤(R17-R18) / (R17+R18)≤0; where R17 is the radius of curvature of the side of the ninth lens facing the object side, and R18 is the radius of curvature of the side of the ninth lens away from the object side. The tenth lens satisfies: 0≤(R19-R20) / (R19+R20)≤0.087; where R19 is the radius of curvature of the side of the tenth lens facing the object side, and R20 is the radius of curvature of the side of the tenth lens away from the object side.

16. An electronic device, characterized in that, The electronic device includes: the camera module according to any one of claims 1 to 15.

Images