Camera module and electronic equipment

Abstract

The invention discloses a camera module and electronic equipment, and belongs to the technical field of camera modules, and the camera module comprises a lens group which has a positive dispersion characteristic; the turn-back prism is arranged on the light emitting side of the lens group and is used for adjusting the propagation direction of the light; the photosensitive component is arranged on the light emitting side of the turn-back prism, and light is converged by the lens group and then reaches the photosensitive component through the turn-back prism to form a light path; and the flat lens is arranged on the light path, and the flat lens has a negative dispersion characteristic.

Description

Technical Field

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

[0002] In related technologies, telephoto optical systems have important applications in consumer electronics devices. However, with the increase in focal length, traditional refractive lenses often require longer optical paths and multiple lens elements to ensure image quality, resulting in a significant increase in module size. To reduce thickness, the industry has proposed a periscope-style folded optical path structure, which effectively reduces the height of the module inside the electronic device by reflecting or folding the optical path.

[0003] However, with the continuous increase in demand for telephoto lenses in recent years, the equivalent focal length has been constantly growing, and the use of large-size detectors has become more common. This has further increased the requirements for aberration correction and light transmission in telephoto optical systems. In periscope architecture, to meet the imaging requirements brought about by telephoto lenses and large sensors, it is usually necessary to increase the number of lenses or increase the curvature complexity of the lenses to correct chromatic aberration, which results in an excessively large camera module size. Summary of the Invention

[0004] This application aims to provide a camera module and electronic device that can solve the technical problem of excessively large size of camera modules, including telephoto optical systems.

[0005] In a first aspect, this application provides a camera module, including:

[0006] The lens group exhibits positive dispersion characteristics;

[0007] A folding prism, positioned on the light-emitting side of the lens group, is used to adjust the direction of light propagation;

[0008] The photosensitive element is located on the light-emitting side of the folding prism. After the light is focused by the lens group, it passes through the folding prism and reaches the photosensitive element, forming an optical path.

[0009] A flat lens is placed in the optical path and exhibits negative dispersion characteristics.

[0010] Secondly, this application provides an electronic device, comprising:

[0011] processor;

[0012] As provided in the first aspect embodiment, the processor and the photosensitive component of the camera module are electrically connected.

[0013] The camera module provided in this application includes a lens group, a folding prism, a photosensitive component, and a flat lens. The lens group is located on the light-emitting side of the folding prism, and the photosensitive component is located on the light-emitting side of the folding prism. After the light is focused by the lens group, it enters the folding prism. After being reflected and refracted by the folding prism, the light illuminates the photosensitive component to form an image. The above path forms an optical path.

[0014] The flat lens is placed in the optical path and has negative dispersion characteristics, while the lens group has positive dispersion characteristics. The flat lens improves the dispersion of the lens group, thereby reducing the chromatic aberration of the camera module.

[0015] Furthermore, since flat lenses do not require complex curved surfaces or a greater number of lenses, the number of lenses in the entire camera module can be reduced, thus reducing the overall size of the camera module.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is one of the schematic diagrams of a camera module according to an embodiment of this application;

[0019] Figure 2 This is a second schematic diagram of a camera module according to an embodiment of this application;

[0020] Figure 3 Is it like this? Figure 2 One of the modulation transfer function (MTF) diagrams of the camera module shown;

[0021] Figure 4 Is it like this? Figure 2 The second MTF diagram of the camera module shown;

[0022] Figure 5 Is it like this? Figure 2 A schematic diagram of the longitudinal spherical aberration of the camera module shown;

[0023] Figure 6 This is a third schematic diagram of a camera module according to an embodiment of this application;

[0024] Figure 7 Is it like this? Figure 6 One of the MTF diagrams of the camera module shown;

[0025] Figure 8 Is it like this? Figure 6 The second MTF diagram of the camera module shown;

[0026] Figure 9 Is it like this? Figure 6 A schematic diagram of the longitudinal spherical aberration of the camera module shown;

[0027] Figure 10 This is the fourth schematic diagram of a camera module according to an embodiment of this application;

[0028] Figure 11 Is it like this? Figure 10 One of the MTF diagrams of the camera module shown;

[0029] Figure 12 Is it like this? Figure 10 The second MTF diagram of the camera module shown;

[0030] Figure 13 Is it like this? Figure 10 A schematic diagram of the longitudinal spherical aberration of the camera module shown;

[0031] Figure 14 A schematic diagram of a flat lens in a camera module according to an embodiment of this application is shown;

[0032] Figure 15 A schematic diagram of an electronic device according to an embodiment of this application is shown.

[0033] Figure label:

[0034] 1. Electronic device; 10. Camera module; 11. Lens group; 111. First lens; 1s1. First surface; 1s2. Second surface; 112. Second lens; 2s1. Third surface; 2s2. Fourth surface; 113. Third lens; 3s1. Fifth surface; 3s2. Sixth surface; 12. Reflecting prism; ps1. First transmissive surface; ps2. First reflective surface; ps3. Second reflective surface; ps4. Third reflective surface; ps5. Fourth reflective surface; ps6. Fifth reflective surface; ps7. Second transmissive surface; 13. Photosensitive element; 14. Flat lens; 141. Substrate; ms1. Seventh surface; ms2. Eighth surface; 142. Nanostructure array; 20. Processor. Detailed Implementation

[0035] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0036] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0037] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] The following is combined Figures 1 to 15 This application describes a camera module 10 and an electronic device 1 according to embodiments thereof.

[0040] Firstly, such as Figure 1 , Figure 2 , Figure 6 and Figure 10 As shown, this application provides a camera module 10, including: a lens group 11, which has positive dispersion characteristics; a folding prism 12, which is disposed on the light-emitting side of the lens group 11 and is used to adjust the propagation direction of light; a photosensitive component 13, which is disposed on the light-emitting side of the folding prism 12, wherein light is converged by the lens group 11 and then passes through the folding prism 12 to reach the photosensitive component 13, forming an optical path; and a planar lens 14, which is disposed on the optical path and has negative dispersion characteristics.

[0041] The camera module 10 provided in this application includes a lens group 11, a folding prism 12, a photosensitive component 13, and a flat lens 14. The lens group 11 is disposed on the light-emitting side of the folding prism 12, and the photosensitive component 13 is disposed on the light-emitting side of the folding prism 12. After the light is converged by the lens group 11, it enters the folding prism 12. After being reflected and refracted by the folding prism 12, it illuminates the photosensitive component 13 to form an image. The above path forms an optical path.

[0042] The flat lens 14 is disposed in the optical path and has negative dispersion characteristics, while the lens group 11 has positive dispersion characteristics. Thus, the flat lens 14 improves the dispersion of the lens group 11, thereby reducing the chromatic aberration of the camera module 10.

[0043] Furthermore, since the flat lens 14 does not require complex curved surfaces and a greater number of lenses, the number of lenses in the entire camera module 10 can be reduced, thus reducing the overall size of the camera module 10.

[0044] The flat lens 14 exhibits negative dispersion characteristics, that is, for red light C, yellow light D, and blue light F, the flat lens 14 satisfies f λCm <f λDm <f λFm f λCm f represents the focal length of the flat lens 14 relative to the red light C. λDm f represents the focal length of the flat lens 14 relative to the yellow light D. λFm This indicates the focal length of the flat lens 14 relative to the blue light F. The wavelength λC of the red light C is 656.3 nm, the wavelength λD of the yellow light D is 587.6 nm, and the wavelength λF of the blue light F is 486.1 nm.

[0045] Furthermore, the flat lens 14 also satisfies f λCm ×λC=f λDm ×λD =f λFm ×λF.

[0046] This application addresses the problems of insufficient control capability of refractive lenses in telephoto optical systems, the need for multiple lenses to be stacked to meet imaging quality requirements, and the large thickness of lenses, making it difficult to further reduce the volume of lens group 11. This application introduces a flat lens 14 with high degree of freedom of wavefront control capability into the folded optical path structure to achieve aberration correction and optical power sharing functions, thereby reducing the number of lenses in lens group 11 and significantly reducing the volume of lens group 11, further improving the miniaturization capability of camera module 10.

[0047] The camera module 10 provided in this application introduces a flat lens 14 with high degree of freedom phase modulation and negative dispersion characteristics to share the aberration correction task of the lens group 11, thereby reducing the number of lenses in the lens group 11.

[0048] like Figure 14 As shown, according to some embodiments of this application, the flat lens 14 includes: a substrate 141; and a nanostructure array 142, which is disposed at least on the light-gathering side of the substrate 141, wherein the nanostructure array 142 is used to make the flat lens 14 exhibit negative dispersion characteristics.

[0049] Specifically, the flat lens 14 includes a substrate 141 and a nanostructure array 142. The nanostructure array 142 is disposed at least on the light-incident surface of the substrate 141. That is, light first irradiates the nanostructure array 142, thereby controlling the phase amplitude and polarization of the light wave through the nanostructure array 142, so that the entire flat lens 14 exhibits negative dispersion characteristics. Furthermore, the structure of the substrate 141 and the nanostructure array 142 only requires the nanostructure array 142 to be disposed on the surface of the flat substrate 141, effectively reducing the volume of the flat lens 14.

[0050] The nanostructure array 142 is made of materials including, but not limited to, carbon dioxide, silicon nitride, aluminum oxide, and silicon dioxide.

[0051] Furthermore, the thickness of the substrate 141 can be reduced, thereby utilizing the thin and light characteristics of the flat lens 14 to effectively reduce the thickness of the entire camera module 10 and improve the compactness of the camera module 10.

[0052] According to some embodiments of this application, the Abbe number of the substrate 141 is positive; the Abbe number of the flat lens 14 ranges from greater than or equal to -5 and less than or equal to 0.

[0053] Specifically, the Abbe number of the substrate 141 is positive. The Abbe number of the flat lens 14 is adjusted to a range greater than or equal to -5 and less than or equal to 0 by the nanostructure array 142, thereby giving the flat lens 14 strong dispersion characteristics and thus balancing the dispersion generated by the lens group 11.

[0054] The Abbe number of the substrate 141 can be between 20 and 80. The Abbe number of the flat lens 14 can be -2.4 or -3.45, etc., and will not be listed here.

[0055] The refractive index ndm of substrate 141 satisfies ndm≥1.51.

[0056] According to some embodiments of this application, the ratio of the optical power of each lens in the lens group 11 to its own Abbe number is a first ratio; the ratio of the optical power of the flat lens 14 to its own Abbe number is a second ratio; wherein the sum of all the first ratios and all the second ratios is 0.

[0057] Specifically, the ratio of the optical power to its Abbe number of each lens in the lens group 11 is the first ratio, and the ratio of the optical power to its Abbe number of the flat lens 14 is the second ratio.

[0058] In the case where there is only one flat lens 14, the sum of all the first ratios and one second ratio is 0, thereby minimizing the color difference in the image of the camera module 10 and improving the shooting effect of the camera module 10.

[0059] When there are two or more flat lenses 14, the sum of all the first ratios and all the second ratios is 0, thereby minimizing the chromatic aberration in the image of the camera module 10 and improving the shooting effect of the camera module 10.

[0060] The optical power of the flat lens 14 can be determined based on other lenses.

[0061] like Figure 1 , Figure 2 , Figure 6 and Figure 10 As shown, according to some embodiments of this application, the lens group 11 includes: a first lens 111, which has positive dispersion characteristics and positive optical power; and a second lens 112, which is disposed on the side of the first lens 111 facing the refraction prism 12, which also has positive dispersion characteristics and negative optical power; wherein, the number of flat lenses 14 is at least one, and a flat lens 14 is disposed at at least one of the following positions: between the first lens 111 and the second lens 112, on the side of the second lens 112 away from the first lens 111, and on the side of the photosensitive assembly 13 facing the refraction prism 12.

[0062] Specifically, the lens group 11 includes a first lens 111 and a second lens 112, which are stacked together. The second lens 112 is located between the folding prism 12 and the first lens 111. That is, light passes through the first lens 111 and the second lens 112 to the folding prism 12.

[0063] The first lens 111 exhibits positive dispersion characteristics and has positive optical power. The second lens 112 is disposed on the side of the first lens 111 facing the folding prism 12. The second lens 112 also exhibits positive dispersion characteristics and has negative optical power. In other words, there is no need to set up a lens with negative dispersion characteristics in the lens group 11. The camera module 10 only corrects dispersion through the flat lens 14, thereby minimizing the number of lens groups 11.

[0064] The number of flat lenses 14 is at least one. The flat lens 14 can be disposed between the first lens 111 and the second lens 112. The flat lens 14 can also be disposed on the side of the second lens 112 away from the first lens 111. The flat lens 14 can also be disposed on the side of the photosensitive component 13 facing the folding prism 12.

[0065] The first lens 111 has positive optical power, and its object-facing surface is convex and exhibits positive dispersion characteristics. That is, for red light C, yellow light D, and blue light F, the first lens 111 satisfies f λC1 > f λD1 > f λF1 f λC1 f represents the focal length of the first lens 111 relative to the red light C. λD1 f represents the focal length of the second lens 112 relative to the yellow light D. λF1 This indicates the focal length of the second lens 112 relative to the blue light F. The wavelength λC of the red light C is 656.3 nm, the wavelength λD of the yellow light D is 587.6 nm, and the wavelength λF of the blue light F is 486.1 nm.

[0066] The refractive index nd1 of the material of the first lens 111 satisfies nd1≥1.75, and the Abbe number Vd1 of the first lens 111 satisfies 18≤Vd1≤55. The refractive index nd2 of the material of the second lens 112 satisfies 1.65≥nd2≥1.58, and the Abbe number Vd2 of the second lens 112 satisfies 30≥Vd2≥20.

[0067] According to some embodiments of this application, the ratio of the focal length fm of the flat lens 14 to the total focal length f of the camera module 10 is greater than or equal to 12 and less than or equal to 35.

[0068] The ratio of the focal length f1 of the first lens 111 to the total focal length f of the camera module 10 is greater than or equal to 0.32 and less than or equal to 0.48.

[0069] The ratio of the focal length f2 of the second lens 112 to the total focal length f of the camera module 10 is greater than or equal to -0.65 and less than or equal to -0.35.

[0070] Specifically, the ratio of the focal length of the flat lens 14 to the total focal length of the camera module 10 is greater than or equal to 12 and less than or equal to 35. The ratio of the focal length of the first lens 111 to the total focal length of the camera module 10 is greater than or equal to 0.32 and less than or equal to 0.48. The ratio of the focal length of the second lens 112 to the total focal length of the camera module 10 is greater than or equal to -0.65 and less than or equal to -0.35.

[0071] The above lens parameter settings can achieve a telephoto effect while minimizing the size and number of lenses.

[0072] like Figure 1 and Figure 2 As shown, according to some embodiments of this application, the lens group 11 further includes: a third lens 113 disposed on the side of the second lens 112 away from the first lens 111, the third lens 113 having positive dispersion characteristics and negative optical power.

[0073] Specifically, the lens group 11 also includes a third lens 113, which is disposed on the side of the second lens 112 away from the first lens 111. The third lens 113 has positive dispersion characteristics and negative optical power. Thus, the third lens 113, together with the first lens 111, the second lens 112 and the flat lens 14, forms a structure for mixed chromatic aberration control, and reduces the thickness of the first lens 111 and the second lens 112, which is beneficial to reducing the production cost of the first lens 111 and the second lens 112.

[0074] Among them, the optical angles of the first lens 111, the second lens 112, the third lens 113, and the flat lens 14 satisfy W1 + W2 + W3 + W meta =W total ,and Where W1 represents the optical power of the first lens 111, W2 represents the optical power of the second lens 112, W3 represents the optical power of the third lens 113, and W... meta W represents the optical power of the flat lens 14. total V represents the total optical power of camera module 10. d1 V represents the Abbe number of the first lens 111. d2 V represents the Abbe number of the second lens 112. d3 V represents the Abbe number of the third lens 113. dm This indicates the Abbe number of the flat lens 14, thereby correcting the chromatic dispersion characteristics of the camera module 10 and improving the color accuracy of the image formed by the camera module 10.

[0075] Based on the above formulas for optical power and dispersion characteristics, a flat lens 14 with the same phase delay distribution is achieved for light of different wavelengths. The negative dispersion characteristics of the flat lens 14 help to compensate for the inherent positive dispersion of the lens group 11 under telephoto imaging conditions, making the chromatic aberration correction of the camera module 10 more efficient.

[0076] like Figure 1 , Figure 2 , Figure 6 and Figure 10 As shown, according to some embodiments of this application, the lens group 11 and the photosensitive component 13 are located on the same side of the reflective prism 12; the reflective prism 12 is a trapezoidal prism, and light is reflected at least three times in the reflective prism 12.

[0077] Specifically, the lens group 11 and the photosensitive component 13 are located on the same side of the folding prism 12, thereby reducing the size of the camera module 10.

[0078] The folding prism 12 is a trapezoidal prism, and light is reflected at least three times in the folding prism 12, thereby extending the optical path and improving the telephoto effect of the camera module 10.

[0079] In other words, by folding the optical path through the folding prism 12, the overall volume of the camera module 10 is significantly reduced, thereby achieving miniaturization of the camera module 10.

[0080] like Figure 1 , Figure 2 , Figure 6 and Figure 10 As shown, the wedge angle θ of the reflecting prism 12 is greater than or equal to 25° and less than or equal to 35°; the thickness t2 of the reflecting prism 12 is greater than or equal to 3.5 mm and less than or equal to 4.5 mm.

[0081] Specifically, by limiting the wedge angle θ and the thickness t2 of the reflecting prism 12, the size and optical path of the reflecting prism 12 are limited. That is, when the reflecting prism 12 satisfies the following conditions, the wedge angle θ is greater than or equal to 25° and less than or equal to 35°, and the thickness t2 is greater than or equal to 3.5mm and less than or equal to 4.5mm, the size and optical path of the reflecting prism 12 can be taken into account, and edge occlusion or optical path interference between the reflecting surfaces can be avoided.

[0082] The wedge angle θ of the folding prism 12 can be 25°, 27°, 30°, 32° or 35°, etc., and the thickness t2 of the folding prism 12 can be 3.5 mm, 3.7 mm, 4 mm, 4.2 mm or 4.5 mm, etc.

[0083] like Figure 1 , Figure 2 , Figure 6 and Figure 10 As shown, according to some embodiments of this application, the reflecting prism 12 undergoes five light reflections, L = 2n(t1 + (t1 + t2) ÷ cos2θ), where L represents the total optical path in the reflecting prism 12, n represents the refractive index of the reflecting prism 12, t1 represents the height of the principal light incident on the reflecting prism 12, t2 represents the thickness of the reflecting prism 12, and θ represents the wedge angle of the reflecting prism 12; wherein, 25° ≤ θ ≤ 35°; 1.8mm ≤ t1 ≤ 2.4mm; 3.5mm ≤ t2 ≤ 4.5mm.

[0084] Specifically, the wedge angle of the reflecting prism 12 is greater than or equal to 25° and less than or equal to 35°, thereby increasing the light reflection angle and extending the light path.

[0085] Five light reflections occur within the reflecting prism 12, where L = 2n(t1 + (t1 + t2) ÷ cos2θ), where L represents the total optical path length in the reflecting prism 12, n represents the refractive index of the reflecting prism 12, t1 represents the height of the principal beam incident on the reflecting prism 12, and t2 represents the thickness of the reflecting prism 12. By reasonably setting θ, t1, and t2, satisfying 25°≤θ≤35°, 1.8mm≤t1≤2.4mm, and 3.5mm≤t2≤4.5mm, a good balance can be achieved between the reflecting optical path length and the size of the reflecting prism 12, and edge occlusion or optical path interference between reflecting surfaces can be avoided, allowing light to stably complete five reflections within the reflecting prism 12.

[0086] The folding prism 12 enables light to undergo five sequential reflections within its interior through multiple reflective interfaces, thereby achieving long optical path transmission within a finite physical thickness and significantly reducing the longitudinal dimension of the rear structure. The geometric characteristics of the folding prism 12 satisfy 25°≤θ≤35°, where θ represents the wedge angle of the folding prism 12. In the folding prism 12, the optical path of the first segment is nt1, the second segment is nt1÷cos2θ, the third segment is nt2÷cos2θ, the fourth segment is nt2÷cos2θ, the fifth segment is nt1÷cos2θ, and the sixth segment is nt1. Thus, the total optical path of light propagation is L = 2n(t1 + (t1 + t2) ÷ cos2θ).

[0087] The reflecting prism 12 ultimately transmits light to the photosensitive element 13.

[0088] The camera module 10 provided in this application embodiment uses a flat lens 14 and a folding prism 12 to reduce the thickness of the lens group 11 and fold the telephoto optical path, resulting in a small volume in terms of length and depth.

[0089] The lens has an even-order aspherical surface shape, satisfying the aspherical formula describing an aspherical surface:

[0090] ;

[0091] Where Z represents the surface elevation, c represents the surface curvature, K represents the conic constant, A, B, C, D, E, F, G and H represent aspheric coefficients, and r represents the radial coordinate of the surface.

[0092] The phase profile of the flat lens 14 is an even-degree polynomial, satisfying the following formula:

[0093] ;

[0094] in, Let M represent the phase distribution function of the flat lens 14, M represent the diffraction order, n represent the highest order of the even-order phase polynomial of the flat lens 14, and A represent the phase distribution function of the flat lens 14. i The coefficients of each order of the even-order phase polynomial of the flat lens 14 are represented, where i represents the order and 2i represents twice i. R represents the aperture radius at different positions of the flat lens 14, and R represents the normalized radius.

[0095] Specifically, the incident end of the first lens 111 is the first surface 1s1, the exit end of the first lens 111 is the second surface 1s2, the incident end of the second lens 112 is the third surface 2s1, the exit end of the second lens 112 is the fourth surface 2s2, the incident end of the third lens 113 is the fifth surface 3s1, the exit end of the third lens 113 is the sixth surface 3s2, the incident end of the substrate 141 of the flat lens 14 is the seventh surface ms1, and the exit end of the substrate 141 of the second lens 112 is the eighth surface ms2.

[0096] The incident end of the folding prism 12 is the first transmission surface ps1, and the exit end of the folding prism 12 is the second transmission surface ps7. Between the first transmission surface ps1 and the second transmission surface ps7, the first reflection surface ps2, the second reflection surface ps3, the third reflection surface ps4, the fourth reflection surface ps5 and the fifth reflection surface ps6 are arranged in sequence.

[0097] Among them, the first reflective surface ps2 and the fifth reflective surface ps6 can be coated with reflective film, and the second reflective surface ps3, the third reflective surface ps4 and the fourth reflective surface ps5 can perform total internal reflection.

[0098] According to some embodiments of this application, the camera module 10 includes a first lens 111, a planar lens 14, a second lens 112, a third lens 113, a folding prism 12, and a photosensitive component 13. Light is incident on the first lens 111 along the optical axis, passes sequentially through the planar lens 14, the second lens 112, and the third lens 113, and then enters the folding prism. It is reflected five times in the folding prism, and after being transmitted through the folding prism 12, it reaches the photosensitive component 13 for final imaging. The first lens 111 has positive optical power and a convex surface on its object side. The planar lens 14 has positive optical power and a planar structure. The second lens 112 has negative optical power, and the third lens 113 has negative optical power.

[0099] The focal length of the camera module 10 is f, and the focal length of the first lens 111 is f1, satisfying the relationship |f1÷f|=0.37.

[0100] The focal length of the flat lens 14 is fm, which satisfies the relationship |fm÷f|=19.2.

[0101] The focal length of the second lens 112 is f2, which satisfies the relationship |f2÷f|=0.47.

[0102] The focal length of the third lens 113 is f3, which satisfies the relationship |f3÷f|=38.

[0103] Specifically, the parameters of the camera module 10 are shown in Table 1 below:

[0104] Table 1

[0105]

[0106] Where f represents the focal length of camera module 10, HFOV represents the half field of view of camera module 10, f1 represents the focal length of first lens 111, fm represents the focal length of flat lens 14, f2 represents the focal length of second lens 112, f3 represents the focal length of third lens 113, HD represents the half diagonal height of photosensitive element 13, and Fno represents the aperture number of camera module 10. The design wavelengths of camera module 10 are 650nm, 610nm, 555nm, 510nm, 470nm, and 435nm. The actual structural thickness of each lens and the spacing between lenses can be set according to actual conditions to reduce the possibility of collision between lenses and prisms. For example, the edge distance from the sixth surface 3s2 of third lens 113 to the first transmission surface ps1 of reflection prism 12 is 0.93 mm, and the center distance is 0.54 mm.

[0107] In this embodiment, the flat lens 14 is positioned between the first lens 111 and the second lens 112, and can perform aberration correction and compensation for global light in different fields of view. Compared to a simple refractive camera module, the camera module 10 provided in this application reduces the lens shoulder height in front of the folding prism 12 by 1.1 mm.

[0108] Specifically, the types, radii of curvature, thicknesses, refractive indices, and Abbe numbers of each surface in the camera module 10 are shown in Table 2.

[0109] Table 2

[0110]

[0111] Among them, the Abbe number of the seventh surface ms1, 64.2, refers to the Abbe number of the substrate 141.

[0112] Specifically, the aspherical coefficients of the second lens 112 and the third lens 113 are shown in Table 3.

[0113] Table 3

[0114]

[0115] The M-order of the flat lens 14 is 1, and the normalized radius is 1 mm. The coefficients of each order of the phase even-order polynomial of the flat lens 14 are shown in Table 4.

[0116] Table 4

[0117]

[0118] like Figure 3 As shown, the MTF of each field of view of the camera module 10 is close to the diffraction limit, exhibiting extremely high resolution. The dashed and solid lines represent the curves in the meridional and sagittal directions, respectively. Figure 3 The horizontal axis represents spatial frequency, measured in cycles per millimeter (mm), and the vertical axis represents the modulation transfer function.

[0119] like Figure 4 As shown in the figure, the defocus MTF of the camera module 10 provided in this embodiment of the application at 156 lp / mm shows that at a spatial frequency of 156 lp / mm, the MTF of the entire field of view is greater than 0.6, indicating extremely high imaging performance. The dashed and solid lines represent the curves in the meridional and sagittal directions, respectively. Figure 4 The horizontal axis represents the defocusing position in millimeters (mm), and the vertical axis represents the modulation transfer function.

[0120] like Figure 5As shown, the Longitudinal Spherical ABER (ABER) of the camera module 10 provided in this embodiment shows that the shift is very small at each wavelength, and the camera module 10 has a small chromatic aberration. Figure 5 The horizontal axis represents the focus, and the unit is millimeters (mm).

[0121] According to some embodiments of this application, the camera module 10 includes a first lens 111, a planar lens 14, a second lens 112, a folding prism 12, and a photosensitive component 13. Light is incident on the first lens 111 along the optical axis, passes sequentially through the planar lens 14 and the second lens 112, and then enters the folding prism. It is reflected five times in the folding prism, and after being transmitted through the folding prism 12, it reaches the photosensitive component 13 for final imaging. The first lens 111 has positive optical power and a convex surface on its object-side surface; the planar lens 14 has positive optical power and a planar structure; and the second lens 112 has negative optical power.

[0122] The focal length of the camera module 10 is f, and the focal length of the first lens 111 is f1, satisfying the relationship |f1 / f|=0.38.

[0123] The focal length of the flat lens 14 is fm, which satisfies the relationship |fm / f|=25.

[0124] The focal length of the second lens 112 is f2, which satisfies the relationship |f2 / f|=0.46.

[0125] Specifically, the parameters of the camera module 10 are shown in Table 5 below:

[0126] Table 5

[0127]

[0128] Where f represents the focal length of camera module 10, HFOV represents the half field of view of camera module 10, f1 represents the focal length of first lens 111, fm represents the focal length of flat lens 14, f2 represents the focal length of second lens 112, HD represents the half diagonal height of photosensitive component 13, and Fno represents the aperture number of camera module 10. The actual structural thickness of each lens and the spacing between lenses can be set according to actual conditions to reduce the possibility of collision between lenses and prisms. For example, the edge distance from the sixth surface 3s2 of second lens 112 to the first transmission surface ps1 of reflection prism 12 is 0.92 mm.

[0129] In this embodiment, the flat lens 14 is positioned between the first lens 111 and the second lens 112, and can perform aberration correction and compensation for global light in different fields of view. Compared to a simple refractive camera module 10, the camera module 10 provided in this application reduces the lens shoulder height in front of the folding prism 12 by 1.4 mm.

[0130] Specifically, the types, radii of curvature, thicknesses, refractive indices, and Abbe numbers of each surface in the camera module 10 are shown in Table 6.

[0131] Table 6

[0132]

[0133] Among them, the Abbe number of the seventh surface ms1, 64.2, refers to the Abbe number of the substrate 141.

[0134] Specifically, the aspherical coefficients of the second lens 112 are shown in Table 7.

[0135] Table 7

[0136]

[0137] The M-order of the flat lens 14 is 1, and the normalized radius is 1 mm. The coefficients of each order of the phase even-order polynomial of the flat lens 14 are shown in Table 8.

[0138] Table 8

[0139]

[0140] like Figure 7 As shown, the MTF of each field of view of the camera module 10 is close to the diffraction limit, exhibiting extremely high resolution. The dashed and solid lines represent the curves in the meridional and sagittal directions, respectively. Figure 7 The horizontal axis represents spatial frequency, measured in cycles per millimeter (mm), and the vertical axis represents the modulation transfer function.

[0141] like Figure 8 As shown in the figure, the defocus MTF of the camera module 10 provided in this embodiment of the application at 156 lp / mm shows that at a spatial frequency of 156 lp / mm, the MTF of the entire field of view is greater than 0.6, indicating extremely high imaging performance. The dashed and solid lines represent the curves in the meridional and sagittal directions, respectively. Figure 8 The horizontal axis represents the defocusing position in millimeters (mm), and the vertical axis represents the modulation transfer function.

[0142] like Figure 9As shown, the longitudinal spherical aberration of the camera module 10 provided in this application embodiment is well corrected at all wavelengths, and the offset of each wavelength is very small, which also shows that the chromatic aberration of the system is well corrected. Figure 9 The horizontal axis represents the focus, and the unit is millimeters (mm).

[0143] According to some embodiments of this application, the camera module 10 includes a first lens 111, a planar lens 14, a second lens 112, a folding prism 12, and a photosensitive component 13. Light is incident on the first lens 111 along the optical axis, passes sequentially through the second lens 112, and then enters the folding prism. It is reflected five times in the folding prism, transmitted through the folding prism 12, and further phase-corrected by the planar lens 14 before reaching the photosensitive component 13. The first lens 111 has positive optical power and a convex surface on its object-side surface; the second lens 112 has negative optical power; and the planar lens 14 has positive optical power and a planar structure.

[0144] The focal length of the camera module 10 is f, and the focal length of the first lens 111 is f1, satisfying the relationship |f1 / f|=0.35.

[0145] The focal length of the second lens 112 is f2, which satisfies the relationship |f2 / f|=0.40.

[0146] The focal length of the flat lens 14 is fm, which satisfies the relationship |fm / f|=12.29.

[0147] Specifically, the parameters of the camera module 10 are shown in Table 9 below:

[0148] Table 9

[0149]

[0150] Where f represents the focal length of camera module 10, HFOV represents the half field of view of camera module 10, f1 represents the focal length of first lens 111, fm represents the focal length of flat lens 14, f2 represents the focal length of second lens 112, HD represents the half diagonal height of photosensitive component 13, and Fno represents the aperture number of camera module 10.

[0151] In this embodiment, the flat lens 14 is positioned between the first lens 111 and the second lens 112, and can perform aberration correction and compensation for global light in different fields of view. Compared to a simple refractive camera module 10, the camera module 10 provided in this application reduces the lens shoulder height in front of the folding prism 12 by 1.6 mm.

[0152] Specifically, the types, radii of curvature, thicknesses, refractive indices, and Abbe numbers of each surface in the camera module 10 are shown in Table 10.

[0153] Table 10

[0154]

[0155] Among them, the Abbe number of the seventh surface ms1, 64.2, refers to the Abbe number of the substrate 141.

[0156] Specifically, the aspherical coefficients of the second lens 112 are shown in Table 11.

[0157] Table 11

[0158]

[0159] The M-order of the flat lens 14 is 1, and the normalized radius is 1 mm. The coefficients of each order of the phase even-order polynomial of the flat lens 14 are shown in Table 12.

[0160] Table 12

[0161]

[0162] like Figure 11 As shown, the MTF of each field of view of the camera module 10 is close to the diffraction limit, exhibiting extremely high resolution. The dashed and solid lines represent the curves in the meridional and sagittal directions, respectively. Figure 11 The horizontal axis represents the spatial frequency, with units of cycles per millimeter (mm), and the vertical axis represents the modulation transfer function.

[0163] like Figure 12 As shown in the figure, the defocus MTF of the camera module 10 provided in this embodiment of the application at 156 lp / mm shows that at a spatial frequency of 156 lp / mm, the MTF of the entire field of view is greater than 0.5, indicating good imaging performance. The dashed and solid lines represent the curves in the meridional and sagittal directions, respectively. Figure 12 The horizontal axis represents the defocusing position in millimeters (mm), and the vertical axis represents the modulation transfer function.

[0164] like Figure 13 As shown, the longitudinal spherical aberration of the camera module 10 provided in this application embodiment is well corrected at all wavelengths, and the offset of each wavelength is very small, which also shows that the chromatic aberration of the system is well corrected. Figure 13 The horizontal axis represents the focus, and the unit is millimeters (mm).

[0165] The camera module 10 provided in this application embodiment can reduce the number of refractive lenses and improve aberration correction capability. It introduces a flat lens 14 with high phase adjustment freedom and significant negative dispersion capability. It can achieve customized phase compensation for different wavelengths with extremely thin thickness. It can effectively undertake part of the optical power and chromatic aberration correction task of the refractive lens, thereby reducing the number of lenses and alleviating the problem of insufficient aberration correction capability of the refractive lens.

[0166] Furthermore, reducing the thickness of the camera module 10 improves its compactness. The flat lens 14 itself adds almost no optical path length, and compared to a thicker refractive lens, it can significantly reduce the thickness of the lens group 11, allowing the camera module 10 to achieve a higher structural compression ratio while maintaining telephoto performance. The overall thickness of the camera module 10 is effectively reduced, which is beneficial for the miniaturization design of the periscope telephoto camera module 10.

[0167] By constructing a long optical path using the folding prism 12, a balance between telephoto and miniaturization is achieved. The folding prism 12, with its five-reflection structure, allows light to achieve a sufficient effective optical path within a limited volume, significantly reducing the physical length of the back focal length of the camera module 10. Compared to a direct-path optical path, this allows for a longer focal length and better image quality within a smaller camera module 10 space.

[0168] Secondly, such as Figure 15 As shown, this application provides an electronic device 1, including: a processor 20; and a camera module 10 as provided in the first aspect embodiment, wherein the processor 20 and the photosensitive component 13 of the camera module 10 are electrically connected.

[0169] The electronic device 1 provided in this application includes the camera module 10 as provided in the first aspect embodiment, and therefore has all the beneficial effects of the camera module 10 as provided in the first aspect embodiment, which will not be repeated hereafter.

[0170] In this application embodiment, electronic device 1 can be a terminal or other devices besides a terminal. For example, electronic device 1 can be a mobile phone, tablet computer, laptop computer, handheld computer, in-vehicle electronic device, mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), etc. It can also be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. This application embodiment does not make specific limitations.

[0171] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0172] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A camera module, comprising: include: The lens group exhibits positive dispersion characteristics; A folding prism, disposed on the light-emitting side of the lens group, is used to adjust the direction of light propagation; A photosensitive component is disposed on the light-emitting side of the folding prism. After the light is focused by the lens group, it passes through the folding prism and reaches the photosensitive component, forming an optical path. A flat lens is disposed in the optical path, and the flat lens exhibits negative dispersion characteristics.

2. The camera module of claim 1, wherein, The flat lens includes: Substrate; A nanostructure array is disposed at least on the light-gathering side surface of the substrate, the nanostructure array being used to make the flat lens exhibit negative dispersion characteristics.

3. The camera module according to claim 2, characterized in that, The Abbe number of the substrate is positive; The Abbe number of the flat lens is greater than or equal to -5 and less than or equal to 0.

4. The camera module according to claim 1, characterized in that, The ratio of the optical power of each lens in the lens group to its own Abbe number is the first ratio. The ratio of the optical power of the flat lens to its Abbe number is the second ratio. Wherein, the sum of all the first ratios and all the second ratios is 0.

5. The camera module according to any one of claims 1 to 4, wherein, The lens group includes: The first lens has positive dispersion characteristics and positive optical power; The second lens is disposed on the side of the first lens facing the folding prism. The second lens has positive dispersion characteristics and negative optical power. The number of the flat lenses is at least one, and the flat lenses are disposed at at least one of the following positions: between the first lens and the second lens, on the side of the second lens away from the first lens, and on the side of the photosensitive component facing the folding prism.

6. The camera module according to claim 5, characterized in that, The ratio of the focal length of the flat lens to the total focal length of the camera module is greater than or equal to 12 and less than or equal to 35. The ratio of the focal length of the first lens to the total focal length of the camera module is greater than or equal to 0.32 and less than or equal to 0.

48. The ratio of the focal length of the second lens to the total focal length of the camera module is greater than or equal to -0.65 and less than or equal to -0.

35.

7. The camera module of claim 5, wherein, The lens group also includes: The third lens is disposed on the side of the second lens opposite to the first lens. The third lens has positive dispersion characteristics and negative optical power.

8. The camera module according to any one of claims 1 to 4, characterized in that, The lens group and the photosensitive component are located on the same side of the folding prism; The folding prism is a trapezoidal prism, and the folding prism reflects light at least three times.

9. The camera module according to any one of claims 1 to 4, characterized in that, The wedge angle of the folding prism is greater than or equal to 25° and less than or equal to 35°. The thickness of the folding prism is greater than or equal to 3.5 mm and less than or equal to 4.5 mm.

10. An electronic device, comprising: include: processor; The camera module as described in any one of claims 1 to 9, wherein the processor and the photosensitive component of the camera module are electrically connected.

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