Optical lens, camera module and electronic equipment

Abstract

The embodiment of the invention provides an optical lens, a camera module and electronic equipment. The optical lens comprises a lens group and a light folding element located on the image side of the lens group. The lens group comprises at least one lens with positive focal power; the light folding element comprises a first part, a second part and a third part which are sequentially connected from the object side to the image side, the first part extends in the first direction, the third part extends in the second direction intersecting with the first direction, and the plane where the first direction and the second direction are located is perpendicular to the optical axis of the lens group; in the light folding element, the incident plane is located at the first part, the deflection reflection plane is located at the second part and is parallel to the optical axis of the lens group, and the emergent plane is located at the third part. Light enters the light folding element from the incident surface, is reflected for at least six times in the light folding element, and then is emitted out of the light folding element from the emergent surface; the at least six reflections include one reflection occurring on the deflecting reflective surface. The optical lens provided by the embodiment of the invention has both long focus and miniaturization.

Description

Optical lenses, camera modules and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on September 4, 2023, with application number 202311136594.4, and priority to the Chinese patent application entitled “Optical lens, camera module and electronic device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of photographing equipment, and specifically to an optical lens, a camera module and an electronic device. Background Art

[0003] Portable devices such as mobile phones and tablets are equipped with optical lenses for capturing images and videos. Telephoto optical lenses can significantly enhance the user's telephoto photography experience and are widely used in camera modules. However, as the focal length of the optical lens increases, the module size also increases, making it difficult to install the camera module in miniaturized electronic devices. Therefore, there is a need for an optical lens that can meet the design requirements of both telephoto and miniaturization.

[0004] Summary of the Invention

[0005] The embodiments of the present application disclose an optical lens, a camera module, and an electronic device. The optical lens meets the design requirements of long focus and miniaturization.

[0006] In a first aspect, an embodiment of the present application provides an optical lens. The optical lens includes a lens group and a light folding element. The lens group includes at least one lens with positive optical power. The light folding element is located on the image side of the lens group. The light folding element includes a first portion, a second portion, and a third portion connected sequentially from the object side to the image side. The first portion extends along a first direction, and the third portion extends along a second direction. The planes containing the first and second directions are perpendicular to the optical axis of the lens group, and the second direction intersects with the first direction. The light folding element includes an incident surface, a deflection and reflection surface, and an exit surface. The incident surface is located in the first portion and faces the lens group. The deflection and reflection surface is located in the second portion and is parallel to the optical axis of the lens group. The exit surface is located in the third portion. After passing through the lens group, external light enters the light folding element from the incident surface and undergoes at least six reflections within the light folding element before exiting the light folding element from the exit surface. The at least six reflections include one reflection on the deflection and reflection surface.

[0007] In this embodiment, the optical lens is provided with a light folding element roughly arranged on a plane perpendicular to the height direction Z of the optical lens (i.e., the XY plane). The light folding element changes the propagation direction of the light emitted from the lens group and folds the light path. The height of the light folding element is much smaller than the back focal length of the optical lens, thereby reducing the height of the optical lens and the camera module, which is conducive to miniaturization.

[0008] For example, the height of the optical folding element is its dimension in the height direction of the optical lens, the length of the optical folding element is its dimension in the length direction of the optical lens, and the width of the optical folding element is its dimension in the width direction of the optical lens. The thickness of the optical folding element can be less than its length. In this case, the height of the optical lens and camera module is further reduced, facilitating miniaturization.

[0009] In some examples, the first direction is parallel to the length direction of the optical lens. In this case, the dimension of the optical folding element in the first direction is equal to the length of the optical folding element. In the embodiments of the present application, because the extension direction of the optical folding element is deflected in the second portion, the extension direction of the first portion (the first direction) of the optical folding element intersects the extension direction of the third portion (the second direction), and the optical folding element undergoes structural bending. As a result, the dimension of the optical folding element in the first direction is reduced, and the length of the optical folding element in the length direction of the optical lens is shortened. This effectively reduces the module length of the optical lens and camera module, facilitating a miniaturized design.

[0010] Furthermore, because the extension direction (first direction) of the first portion of the light folding element intersects the extension direction (second direction) of the third portion, the light folding element undergoes structural bending. Therefore, when the length dimension of the light folding element in the length direction Y of the optical lens is limited, the extension length of the light folding element (i.e., the length of the light folding element extending from the object-side end to the image-side end) can be increased by increasing the length of the third portion, thereby increasing the number of optical path folds and / or the optical length within the light folding element, thereby facilitating the telephoto design of the optical lens. In an embodiment of the present application, the optical lens, by designing the shape of the light folding element and reflecting light at least six times in the light folding element, enables the light folding element to have a longer optical length in a smaller volume, thereby facilitating the telephoto design of the optical lens.

[0011] It can be understood that the at least six reflections of light in the light folding element include one reflection on the deflecting reflective surface and at least five reflections on the remaining surfaces of the light folding element. The reflection of light on the deflecting reflective surface is primarily used to deflect the light path along with the structural bending of the light folding element, allowing it to continue propagating within the light folding element; the at least five reflections of light on the remaining surfaces of the light folding element are primarily used to fold the light path, thereby increasing the optical path length.

[0012] In one possible embodiment, a first angle α is formed between the first direction and the second direction, and the first angle α satisfies the following conditions: 50° ≤ α ≤ 150°. In this embodiment, by setting the range of the first angle α, the length of the light folding element in the first direction can be significantly shortened, and interference between the incident and outgoing light paths in the light folding element can be minimized. Furthermore, when the lens assembly, light folding element, and image sensor are compactly arranged, mechanical interference between the lens and image sensor module can be avoided, thereby ensuring mechanical reliability.

[0013] In one possible embodiment, a first angle α is formed between the first direction and the second direction, and the first angle α satisfies the following conditions: 70° ≤ α ≤ 135°. In this embodiment, by setting the range of the first angle α, the length of the light folding element in the first direction can be significantly shortened, and interference between the incident and outgoing light paths in the light folding element can be minimized. Furthermore, when the lens assembly, light folding element, and image sensor are compactly arranged, mechanical interference between the lens assembly and the image sensor module can be avoided, thereby ensuring mechanical reliability.

[0014] In one possible embodiment, light emitted from the lens assembly enters the incident surface of the light folding element along the optical axis of the lens assembly. The incident optical axis of the light incident on the incident surface coincides with the optical axis of the lens assembly. The optical axis of the lens assembly and the incident surface may intersect at a first position. In this embodiment of the present application, the center point of the incident surface may be set at the first position.

[0015] Light emitted from the exit surface has an exit optical axis, which can coincide with the vertical centerline of the photosensitive surface of the image sensor. The exit optical axis can be parallel to the optical axis of the lens assembly. The exit optical axis intersects the exit surface at a third position. In embodiments of the present application, the center point of the exit surface can be set at the third position.

[0016] The first position on the incident surface is spaced apart from the second position by a line extending along the first direction from the deflecting reflective surface. The first position and the second position form a first spacing S1, and the second position and the third position on the exit surface form a second spacing S2. The first spacing S1 and the second spacing S2 satisfy the following conditions: 13mm≤S1+S2≤47mm. For example, the value of S1+S2 can be 20mm, 22mm, 25mm, 25.2mm, 28mm, 32mm, 37mm, 25.2mm, 41mm, etc. In some examples, the first spacing S1 and the second spacing S2 satisfy the following conditions: 17.5mm≤S1+S2≤42.5mm.

[0017] In this embodiment, by controlling the first spacing S1 and the second spacing S2, the optical lens can be placed in a telephoto range, enabling telephoto photography with a larger aperture and higher image quality.

[0018] Exemplarily, the first position P1 and the third position P3 form a third interval S3 in the first direction.

[0019] In some examples, a first spacing S1 between the first position P1 and the second position P2, a second spacing S2 between the second position P2 and the third position P3, and a third spacing S3 between the first position P1 and the third position P3 in the first direction satisfy the following conditions: S3 ≤ S1, and 50% ≤ S1 / (S1+S2) ≤ 90%, or 50% ≤ S1 / (S1+S2) ≤ 80%. For example, the value of S1 / (S1+S2) can be 67%, 75%, 80%, 85%, etc.

[0020] In other examples, a first spacing S1 between the first position P1 and the second position P2, a second spacing S2 between the second position P2 and the third position P3, and a third spacing S3 between the first position P1 and the third position P3 in the first direction satisfy the following conditions: S1 ≤ S3, and 50% ≤ S3 / (S1+S2) ≤ 90%, or 50% ≤ S3 / (S1+S2) ≤ 80%. For example, the value of S3 / (S1+S2) can be 67%, 75%, 80%, 85%, etc.

[0021] In this embodiment, by setting the ratio of S1 / (S1+S2) when S3≤S1 and setting the ratio of S3 / (S1+S2) when S1≤S3, the length of the optical folding element in the first direction can be reduced, which is beneficial to the miniaturized design of the optical lens and the camera module 200, and at the same time, mechanical interference between the lens group and the image sensor module can be avoided, thereby ensuring mechanical reliability.

[0022] In one possible embodiment, the light folding element includes a top surface and a bottom surface arranged in parallel, the arrangement direction of the top surface and the bottom surface is parallel to the optical axis of the lens group, the incident surface is located on the top surface, and the exit surface is located on the top surface or the bottom surface; the deflection reflection surface connects the top surface and the bottom surface; the light folding element also includes a first reflection surface and a second reflection surface, the first reflection surface is located in the first part and connects the top surface and the bottom surface, and the second reflection surface is located in the third part and connects the top surface and the bottom surface; after the light enters the light folding element, it undergoes the first reflection on the first reflection surface, at least three reflections on the top surface and the bottom surface, and the last reflection on the second reflection surface.

[0023] In this embodiment, the lens assembly and image sensor are located on the same side of the light folding element, allowing them to reuse the height space, thereby facilitating the miniaturization of the camera module. It can be understood that after being converged by the lens assembly, light enters the light folding element through the incident surface of the light folding element. After undergoing six reflections within the light folding element, it is emitted from the exit surface of the light folding element and is imaged on the image sensor. The optical lens uses the light folding element to multiple-reflect the converged light from the lens assembly, folding the optical path. This shortens the physical space between the lens assembly and the image sensor, reducing the module size of the optical lens and achieving miniaturization.

[0024] In a possible implementation, a second angle β is formed between the first reflection surface and the incident surface, and the second angle β satisfies: 22°≤β≤40° or 25°≤β≤37°.

[0025] In this embodiment, the optical lens controls the optical path of light entering the light folding element by limiting the range of the second angle, allowing the light to undergo at least five folds and reflections within the light folding element. This effectively increases the optical path, achieving a telephoto and compact design, while also reducing stray light within the optical lens and improving the imaging quality of the optical lens. However, if the second angle is too large, the height of the light folding element will be too large, hindering the reduction of the optical lens height. If the second angle is too small, the light will not be able to meet the requirements of total internal reflection within the light folding element, hindering light transmission and imaging.

[0026] In a possible implementation, the field of view (FOV) of the optical lens satisfies: FOV≤30°, or FOV≤20°.

[0027] In this embodiment, by designing the value of the field of view FOV of the optical lens, the light can be smoothly folded and reflected at least five times in the light folding element, thereby achieving telephoto shooting, and can fully compress the length dimensions of the light folding element and the optical lens, which is conducive to miniaturization design.

[0028] In a possible implementation, the system focal length EFL of the optical lens satisfies: 20 mm ≤ EFL ≤ 60 mm, or 30 mm ≤ EFL ≤ 50 mm.

[0029] In this embodiment, the optical lens adopts the architecture of lens group + light folding element, and by limiting the system focal length EFL of the optical lens, the optical lens can achieve the desired telephoto shooting, and the system focal length EFL corresponds to a larger back focal length, which can be achieved by at least five folding reflections of light in the light folding element, and the length of the light folding element can be further compressed by one deflection reflection, so that the optical lens can take into account the needs of telephoto shooting and the needs of module miniaturization.

[0030] In the embodiment of the present application, the design of the field of view FOV of the optical mirror, the design of the system focal length EFL of the optical lens, the design of the size of the image sensor, and the design of the number of folding reflections of the light folding element are interrelated and influence each other. Through the combined design of relevant parameters, the optical system can have a better field of view and sensor range, so as to better achieve telephoto and miniaturization, and can also have better imaging quality.

[0031] In a possible implementation, the total optical length TTL of the optical lens and the system focal length EFL satisfy: 0.7≤TTL / EFL≤1.8, or 0.9≤TTL / EFL≤1.5.

[0032] In this embodiment, the light entering the optical lens is reflected and folded multiple times by the light folding element, so that the ratio of the total optical length of the optical lens to the effective focal length of the optical lens can meet the specified conditions, thereby making the optical lens have a longer focal length to achieve a good long-range shooting effect and enabling the miniaturization design of the optical lens.

[0033] In a possible implementation, the total optical path length PL of the light folding element and the system focal length EFL satisfy: 0.5≤PL / EFL≤1.5.

[0034] In this embodiment, by limiting the ratio of the total optical path length of the light folding element to the focal length of the system PL / EFL to within the range of 0.5 to 1.5, the light folding element achieves multiple folding of the optical path, resulting in an optical lens having a longer optical path and a shorter physical length, which is conducive to miniaturization. PL / EFL can be used to design the total optical path length of the light folding element suitable for the focal length of the system based on the desired field of view (FOV) of the optical lens. If PL / EFL is lower than 0.5, the total optical path length of the light folding element becomes shorter relative to the focal length of the system, and the portion of the optical path in the optical lens that is not accompanied by multiple reflections increases, thereby weakening the effect of reducing the module size by folding the optical path through the light folding element. If PL / EFL is greater than 1.5, the ratio of the total optical path length of the light folding element to the focal length of the system becomes too large, making it impossible to ensure the space required for arranging the lenses to ensure optical performance, and thus failing to achieve the desired optical performance.

[0035] In one possible implementation, the lens group includes a first lens closest to the object side, and the focal length of the first lens and the system focal length of the optical lens satisfy: 0.2≤F1 / EFL≤0.7, or 0.25≤F1 / EFL≤0.5.

[0036] In this embodiment, by limiting the ratio of the focal length F1 of the first lens to the system focal length EFL of the optical lens within the range of 0.2 to 0.7, the light focusing effect of the first lens can be made suitable for the optical lens, so that the total optical path length of the lens group and the total optical path length of the light folding element are both appropriate, avoiding the module size of the optical lens from being too large, and also making the optical lens have better optical performance and better imaging quality.

[0037] In a second aspect, embodiments of the present application provide a camera module, which includes an image sensor and any one of the above-mentioned optical lenses, wherein the image sensor is located on the image side of the optical lens.

[0038] In this embodiment, the image sensor surface contains hundreds of thousands to millions of photodiodes, which generate an electrical charge when exposed to light. The image sensor utilizes the photoelectric conversion function of optoelectronic devices to convert the light image on its photosensitive surface into an electrical signal proportional to the light image. The photosensitive surface of the image sensor is positioned facing the optical lens.

[0039] In a possible implementation, during the focusing process of the camera module, the lens group, at least one lens in the lens group, or the image sensor moves in a direction parallel to the optical axis of the lens group.

[0040] In this embodiment, the camera module can achieve automatic focus by moving the lens group, the lenses in the lens group, or the image sensor to obtain better imaging quality and shooting experience.

[0041] In a possible implementation, during the anti-shake process of the camera module, the lens group, at least one lens in the lens group, or the image sensor moves on a plane perpendicular to the optical axis of the lens group.

[0042] In this embodiment, the camera module can achieve optical image stabilization through the movement of the lens group, the lenses in the lens group, or the image sensor to obtain better imaging quality and shooting experience.

[0043] In a third aspect, embodiments of the present application provide an electronic device comprising an image processor and any of the above-mentioned camera modules, wherein the image processor is communicatively connected to the camera module and configured to acquire image data from the camera module and process the image data.

[0044] In this embodiment, the optical lens of the electronic device meets the design requirements of long focus and miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0046] FIG1 is a schematic structural diagram of an electronic device provided in some embodiments of the present application;

[0047] FIG2 is a schematic diagram of a cross-sectional structure of the electronic device shown in FIG1 taken along line AA;

[0048] FIG3 is a schematic structural diagram of the camera module shown in FIG2 in some embodiments;

[0049] FIG4 is a schematic structural diagram of the light folding element shown in FIG3 ;

[0050] FIG5A is a top view of the light folding element shown in FIG4 in some embodiments;

[0051] FIG5B is a top view of the light folding element shown in FIG4 in some other embodiments;

[0052] FIG5C is a top view of the light folding element shown in FIG4 in some other embodiments;

[0053] FIG6 is a schematic diagram of an equivalent unfolded optical path of the light folding element shown in FIG4 ;

[0054] FIG7A is a schematic structural diagram of the camera module shown in FIG1 in other embodiments;

[0055] FIG7B is a schematic diagram of an equivalent unfolded optical path of the light folding element of the camera module shown in FIG7A ;

[0056] FIG8A is a schematic diagram of an equivalent expanded optical path of the camera module shown in FIG3 in the first embodiment;

[0057] FIG8B is a simulation effect diagram of the camera module shown in FIG8A in a possible embodiment;

[0058] FIG9A is a schematic diagram of an equivalent expanded optical path of the camera module shown in FIG3 in a second embodiment;

[0059] FIG9B is a simulation effect diagram of the camera module shown in FIG9A in a possible embodiment;

[0060] FIG10A is a schematic diagram of an equivalent expanded optical path of the camera module shown in FIG3 in the third embodiment;

[0061] FIG. 10B is a diagram showing a simulation effect of the camera module shown in FIG. 10A in a possible embodiment. DETAILED DESCRIPTION

[0062] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of this application are explained and described below.

[0063] Focal power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam. It characterizes the ability of an optical system to deflect light.

[0064] A lens or lens group with positive optical power has a positive focal length and has the effect of converging light.

[0065] A lens or lens group with negative optical power has a negative focal length and has the effect of diverging light.

[0066] Focal length, also known as focal length, is a measure of the convergence or divergence of light in an optical system. It refers to the vertical distance from the optical center of a lens or lens group to the focal plane, when an object at infinite distance is formed through the lens or lens group. From a practical perspective, it can be understood as the distance from the center of the lens to the plane when the object is at infinite distance. For a fixed-focus lens, the position of its optical center is fixed; for a telephoto lens, changes in the optical center result in changes in the focal length.

[0067] The object side is divided by the lens. The side where the object is located is called the object side, and the surface of the lens close to the object side is called the object side.

[0068] The image side, with the lens as the boundary, the side where the image of the object is located is called the image side, and the surface of the lens close to the image side is called the image side.

[0069] The aperture diaphragm is a device used to control the amount of light that passes through the lens and enters the photosensitive surface inside the camera body. It is usually inside the lens.

[0070] Aperture, also known as F-number (Fno), is a relative value calculated by dividing the focal length of a lens by the diameter of its entrance pupil (the inverse of the relative aperture). The smaller the aperture, the more light enters the image per unit time. A larger aperture reduces the depth of field, blurring the background in photos, similar to the effect of a telephoto lens.

[0071] Total track length (TTL) refers to the total length from the surface of the lens closest to the object side to the imaging surface.

[0072] The imaging plane is located on the image side of all lenses in the telephoto lens, and is the plane on which the image is formed after light passes through each lens in the telephoto lens in sequence.

[0073] The optical axis is an axis running perpendicularly through the center of a lens. It's the axis running through the centers of each lens element. When light rays parallel to the optical axis enter a convex lens, an ideal convex lens would have all the rays converge at a single point behind the lens. This point is the focal point.

[0074] Focus is the point where parallel light rays converge after being refracted by a lens or group of lenses.

[0075] The image focal plane, also called the back focal plane or the second focal plane, is a plane passing through the image focus (also called the back focus or the second focus) and perpendicular to the optical axis of the system.

[0076] Back focal length (BFL), also known as back focal length (BFD), is the distance from the vertex of the last optical surface of the system to the image-side focal point.

[0077] The Abbe number (Abbe), also known as the dispersion coefficient, is the difference ratio of the refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0078] In optical instruments, the field of view (FOV) is the angle between the two edges of the maximum range through which the image of the measured object can pass, with the lens as the vertex. The field of view determines the visual range of the optical instrument. A larger field of view means a wider field of view and a smaller optical magnification.

[0079] The half-sensor diagonal ImgH (Image Hight) represents half of the diagonal length of the effective pixel area on the photosensitive chip, that is, the image height of the imaging surface.

[0080] Aberration: The paraxial region of an optical system has the properties of an ideal optical system. The paraxial light emitted from a point on the object intersects the image plane at one point (also known as the paraxial image point). However, the light rays that actually pass through different apertures of the lens are unlikely to intersect perfectly at one point. Instead, there is a certain deviation from the position of the paraxial image point. These differences are collectively called aberrations.

[0081] Longitudinal spherical aberration, also known as longitudinal chromatic aberration, positional chromatic aberration, or axial chromatic aberration, occurs when a beam of light parallel to the optical axis converges at different positions before and after passing through a lens. This aberration is called positional chromatic aberration or axial chromatic aberration. This is because the lens forms images of different wavelengths at different positions, causing the focal planes of the different colors of light to not coincide in the final image, resulting in the dispersion of the complex light.

[0082] Distortion, also known as distortion, refers to the degree to which the image formed by an optical system is distorted relative to the object itself. Distortion is caused by spherical aberration. The height at which the chief rays of light from different fields of view intersect the Gaussian image plane after passing through the optical system is not equal to the ideal image height. The difference between the two is the distortion. Therefore, distortion only changes the image position of off-axis object points on the ideal plane, distorting the image shape but not affecting image clarity.

[0083] Astigmatism occurs when an object point is not on the optical axis of an optical system. The resulting beam is tilted at an angle to the optical axis. After refraction through a lens, the convergence points of the meridional and sagittal beamlets are not aligned. This means the beam cannot be focused to a single point, resulting in an unclear image. Astigmatism is the name given to beams in two perpendicular planes within a rotationally symmetric optical system.

[0084] Meridian plane: The plane formed by the chief ray (chief beam) of an object point outside the optical axis and the optical axis is called the meridian plane.

[0085] The sagittal plane is the plane that passes through the main ray (main beam) of the object point outside the optical axis and is perpendicular to the meridian plane.

[0086] Field curvature describes the difference in the optical axis between the sharpest image point of non-central field rays and the sharpest image point of the central field rays after passing through an optical lens system. When a lens exhibits field curvature, the intersection of the entire light beam does not coincide with the ideal image point. Although a sharp image point can be obtained at each specific point, the entire image plane is a curved surface.

[0087] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " represents or, for example, A / B can represent A or B; "and / or" in the text is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two.

[0088] In the following, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features.

[0089] In addition, in the embodiments of the present application, the limitations of the relative positional relationship mentioned, such as parallel, perpendicular, etc., are all for the current state of the art, rather than absolutely strict limitations, and a small amount of deviation is allowed, and it is possible to be approximately parallel, approximately perpendicular, etc. For example, A and B are parallel, which means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 and 10 degrees. For example, A and B are perpendicular, which means that A and B are perpendicular or approximately perpendicular, and the angle between A and B can be between 80 and 100 degrees.

[0090] The embodiments of the present application provide an optical lens, a camera module, and an electronic device. The optical lens includes a lens group and a light folding element located on the image side of the lens group; the lens group includes at least one lens with positive optical power; the light folding element includes a first part, a second part, and a third part connected in sequence from the object side to the image side, the first part extends along a first direction, the third part extends along a second direction intersecting the first direction, and the planes in which the first and second directions lie are perpendicular to the optical axis of the lens group; in the light folding element, the incident surface is located in the first part, the deflection reflection surface is located in the second part and is parallel to the optical axis of the lens group, and the exit surface is located in the third part; light enters the light folding element from the incident surface, and after at least six reflections in the light folding element, it exits the light folding element from the exit surface; the at least six reflections include one reflection on the deflection reflection surface. The optical lens of the embodiment of the present application undergoes structural bending through the light folding element to better balance the requirements of telephoto shooting and module miniaturization.

[0091] Please refer to Figures 1 and 2 in combination. Figure 1 is a structural schematic diagram of the electronic device provided in some embodiments of the present application, and Figure 2 is a cross-sectional structural schematic diagram of the electronic device shown in Figure 1 taken along AA.

[0092] In some embodiments, the electronic device 1000 may be a mobile phone, a tablet computer, a laptop computer, a wearable device, a camera, or other device with a photographing or video recording function. In the embodiments of the present application, the electronic device 1000 is described as a mobile phone.

[0093] For example, the electronic device 1000 may include a housing 100, a display screen 110, a camera module 200, and an image processor 300. The housing 100 may include a rear cover 101 and a frame 102. The rear cover 101 may be an integrally formed structural component with the frame 102, or may be assembled to form an integrated structure. The display screen 110 and the rear cover 101 are respectively mounted on either side of the frame 102, together enclosing an internal cavity for mounting the camera module 200, the image processor 300, or other structural components.

[0094] The electronic device 1000 may have a width direction X', a length direction Y', and a thickness direction Z', wherein the length direction Y' is perpendicular to the width direction X', and the thickness direction Z' is perpendicular to the width direction X' and the length direction Y'. The display screen 110 and the back cover 101 may be arranged relative to each other in the thickness direction Z' of the electronic device 1000. In this case, the back cover 101 may be perpendicular to the thickness direction Z' of the electronic device 1000.

[0095] Exemplarily, the camera module 200 is installed in the housing 100, and the light incident side of the camera module 200 can be set toward the rear cover 101 to serve as the rear camera of the electronic device 1000. The rear cover 101 can be provided with an opening 1011, and the camera module 200 collects light outside the electronic device 1000 through the opening 1011 of the rear cover 101 to achieve picture or video shooting. Exemplarily, the rear cover 101 may include a translucent lens 1012, which is installed in the opening 1011 of the rear cover 101 to allow light to pass through and is dustproof and waterproof. In some other embodiments, the light incident side of the camera module 200 can face the side where the display screen 110 is located, serving as the front camera of the electronic device 1000. Both the front camera and the rear camera can be used for selfies, and can also be used by the photographer to shoot other objects.

[0096] It will be understood that the installation position of the camera module 200 of the electronic device 1000 in the embodiment shown in FIG1 is merely illustrative, and this application does not impose strict limitations on the installation position of the camera module 200. In some other embodiments, the camera module 200 may also be installed in other locations of the electronic device 1000, for example, the camera module 200 may be installed in the upper middle portion or the upper right corner of the back of the electronic device 1000. In some other embodiments, the electronic device 1000 may include a terminal body and an auxiliary component that can be rotated, moved, or detached relative to the terminal body, and the camera module 200 may also be disposed on the auxiliary component.

[0097] Exemplarily, the display screen is fixed to the housing 100 and is used to display images to meet user needs. The display screen may include a display layer and a touch layer covering the display layer. The touch layer allows for touch operations by the user and may be a transparent glass cover, plastic, or other light-transmitting material. The display layer may be a liquid crystal display or an organic light-emitting diode display. The display layer may include a display area and a non-display area. The non-display area is located to one side of the display area or is disposed around the periphery of the display area. In some electronic devices, the non-display area may not be provided.

[0098] Exemplarily, the image processor 300 is communicatively connected to the camera module 200, and the image processor 300 is configured to obtain image data from the camera module 200 and process the image data. The communication connection between the camera module 200 and the image processor 300 may include data transmission via an electrical connection such as wiring, or data transmission may be achieved through coupling or other methods. It is understood that the camera module 200 and the image processor 300 may also be communicatively connected via other methods capable of achieving data transmission.

[0099] The image processor 300 may include multiple processing modules that convert the raw image signal captured by the camera module 200 to form image information, transmit the processed information to the display module of the display screen, and display the image or video on the display screen. The image processor 300 may be an image processing chip or a digital signal processing chip, and is used to adjust the image color, perform noise reduction processing on the image, and further improve image quality.

[0100] In some embodiments, the electronic device 1000 may further include an analog-to-digital converter 400, which is connected between the camera module 200 and the image processor 300. The analog-to-digital converter 400 is used to convert the signal generated by the camera module 200 into a digital image signal and transmit it to the image processor 300.

[0101] In some embodiments, the electronic device 1000 may further include a memory, which is communicatively connected to the image processor 300. The image processor 300 processes the image digital signal and then transfers the image to the memory, so that the image can be retrieved from the memory at any time and displayed on the display screen when the image needs to be viewed later.

[0102] In some embodiments, the image processor 300 further compresses the processed image digital signal and then stores it in the memory to save memory space.

[0103] It is understood that the number of camera modules 200 can be one or at least two. When the number of camera modules 200 is one, the camera module 200 can be used as a front camera or a rear camera. When the number of camera modules 200 is at least two, the at least two camera modules 200 can be cameras such as a telephoto camera module and a wide-angle camera module that can meet different shooting requirements, and this application does not limit this.

[0104] In the embodiment of the present application, the working principle of the camera module 200 in the electronic device 1000 can be: the light reflected by the photographed scene enters the interior of the camera module 200, generates an optical image and projects it onto the surface of the image sensor, the image sensor converts the optical image into an electrical signal, i.e., an analog image signal, and transmits the converted analog image signal to the analog-to-digital converter 400, so as to be converted into a digital image signal through the analog-to-digital converter 400 and given to the image processor 300, the image processor 300 can operate to convert the original image signal captured by the camera module 200 to form image information, and transmit the processed information to the display module of the display screen 110, so as to display the image or video through the display screen 110, or the image processor 300 can process the image digital signal and transmit the image to the memory so that the image can be retrieved from the memory at any time and displayed on the display screen 110 when the image needs to be viewed later.

[0105] FIG1 is a schematic diagram illustrating the structure of an electronic device 1000. The size, quantity, and location of the camera module 200, image processor 300, analog-to-digital converter 400, and memory shown in FIG1 are merely schematic and may be adjusted as needed, and are not limited in this application.

[0106] Please refer to FIG. 2 and FIG. 3 in combination. FIG. 3 is a schematic structural diagram of the camera module 200 shown in FIG. 2 in some embodiments.

[0107] In some embodiments, the camera module 200 may include an optical lens 10, an image sensor 20, and a filter 30. Light reflected from the object being photographed is refracted by the optical lens 10, passes through the filter 30, and is incident on the image sensor 20 to form an image.

[0108] The image sensor 20 can be located on the image side of the optical lens 10. The image sensor 20 is a semiconductor chip, also known as a photosensitive chip. The surface of the image sensor 20 contains hundreds of thousands to millions of photodiodes, which generate an electrical charge when exposed to light. The image sensor 20 utilizes the photoelectric conversion function of a photoelectric device to convert the light image on its photosensitive surface into an electrical signal proportional to the light image. The photosensitive surface of the image sensor 20 is positioned facing the optical lens 10. The image sensor 20 can be a charge-coupled device, a complementary metal oxide semiconductor, a phototransistor, or a thin-film transistor, among others.

[0109] For example, the camera module 200 may further include a driver (not shown) for driving the lens 21 and / or the image sensor 20 to achieve autofocus and / or optical image stabilization. The driver may be a motor, for example, a voice coil motor or a shape memory alloy motor.

[0110] For example, the filter 30 can be located between the optical lens 10 and the image sensor 20. Light passing through the optical lens 10 is incident on the filter 30 and filtered by the filter 30 to form an image on the image sensor 20. For example, the filter 30 can be an infrared filter. The filter 30 can eliminate light of unnecessary wavelengths from projecting onto the image sensor 20, preventing false colors or moiré on the image sensor 20, thereby improving its effective resolution and color reproduction.

[0111] In some embodiments, the filter structure can be eliminated and filtering can be achieved by performing surface treatment or material treatment on at least one optical element of the optical lens 10. This application does not strictly limit the specific embodiments of the structure or structure used to achieve filtering.

[0112] For example, the optical lens 10 may have a width direction X, a length direction Y, and a height direction Z. The length direction Y may be perpendicular to the width direction X, and the height direction Z may be perpendicular to the width direction X and the length direction Y. The width direction, length direction, and height direction of the camera module 200 may correspond one-to-one to the width direction X, length direction Y, and height direction Z of the optical lens 10.

[0113] When the camera module 200 is installed in the electronic device 1000, the height direction Z of the optical lens 10 is parallel to the thickness direction Z' of the electronic device 1000. At this time, the height direction Z of the optical lens 10 is perpendicular to the rear cover 101 and the display screen 110 of the electronic device 1000.

[0114] The following is an example of an implementation scheme of the optical lens 10 shown in FIG3 .

[0115] Please refer to FIG. 3 and FIG. 4 , FIG. 4 is a schematic structural diagram of the light folding element 2 shown in FIG. 3 .

[0116] In some embodiments, the optical lens 10 includes a lens group 1 and a light folding element 2 , wherein the light folding element 2 is located on the image side of the lens group 1 .

[0117] Exemplarily, lens assembly 1 has an optical axis O, and a height direction Z of optical lens 10 is parallel to the optical axis O of lens assembly 1. Lens assembly 1 includes at least one lens having positive optical power. In some examples, lens assembly 1 may include multiple lenses, for example, 2 to 4 lenses, which may be arranged along optical axis O of lens assembly 1, and at least one of the multiple lenses has positive optical power.

[0118] Illustratively, the light folding element 2 is used to fold the optical path to shorten the physical space between the lens assembly 1 and the image sensor 20. In some examples, the light folding element 2 may be a prism. The light folding element 2 may have a generally strip-shaped structure. Illustratively, the light folding element 2 may have an incident surface 21 and an exit surface 22. The incident surface 21 may be located at the object-side end of the light folding element 2, which is close to the object side, and the exit surface 22 may be located at the image-side end of the light folding element 2, which is close to the image side. Light enters the light folding element 2 through the incident surface 21, propagates from the object-side end to the image-side end of the light folding element 2, undergoes multiple reflections during propagation, and then exits the light folding element 2 through the exit surface 22. The object-side end of the light folding element 2 is disposed corresponding to the lens assembly 1, with the incident surface 21 facing the lens assembly 1 to receive light emitted by the lens assembly 1. The image sensor 20 is disposed corresponding to the image-side end of the light folding element 2 and facing the exit surface 22, so that light emitted by the light folding element 2 can form an image on the image sensor 20.

[0119] In the embodiment of the present application, after being converged by the lens assembly 1, the light enters the light folding element 2 through the incident surface 21 of the light folding element 2. After being reflected multiple times within the light folding element 2, the light is emitted through the exit surface 22 of the light folding element 2 and is then imaged on the image sensor 20. The optical lens 10 uses the light folding element 2 to reflect the converged light from the lens assembly 1 multiple times, folding the optical path. This shortens the physical space between the lens assembly 1 and the image sensor 20, thereby reducing the module size of the optical lens 10 and achieving miniaturization.

[0120] It is understood that light emitted from the lens assembly 1 enters the incident surface 21 of the light folding element 2 along the optical axis O of the lens assembly 1. The incident optical axis of the light incident on the incident surface 21 coincides with the optical axis O of the lens assembly 1. The optical axis O of the lens assembly 1 and the incident surface may intersect at a first position P1. In this embodiment of the present application, the center point of the incident surface 21 may be set at the first position P1.

[0121] Light emitted from the exit surface 22 has an exit optical axis O', which can coincide with the vertical centerline of the photosensitive surface of the image sensor 20. The exit optical axis O' can be parallel to the optical axis O of the lens assembly 1. The exit optical axis O' intersects the exit surface 22 at a third position P3. In this embodiment of the present application, the center point of the exit surface 22 can be set at the third position P3.

[0122] In some embodiments, the light folding element 2 may include a first portion 2a, a second portion 2b, and a third portion 2c sequentially connected from the object side to the image side. At this time, the light entering the light folding element 2 passes through the first portion 2a, the second portion 2b, and the third portion 2c in sequence and then exits. The first portion 2a may extend along a first direction, and the third portion 2c may extend along a second direction. The planes containing the first and second directions are perpendicular to the optical axis O of the lens group 1, and the second direction intersects with the first direction. The planes containing the first and second directions are the planes containing the coplanarity of the first and second directions. The planes containing the first and second directions are perpendicular to the optical axis O of the lens group 1, that is, perpendicular to the height direction Z of the optical lens 10. The light folding element 2 is roughly arranged on a plane perpendicular to the height direction Z of the optical lens 10 (that is, an XY plane).

[0123] Exemplarily, the incident surface 21 of the light folding element 2 is located in the first portion 2a, and the exit surface 22 is located in the third portion 2c. The light folding element 2 also includes a deflecting and reflecting surface 23 located in the second portion 2b and parallel to the optical axis O of the lens assembly 1. After passing through the lens assembly 1, external light enters the light folding element 2 through the incident surface 21 and, after undergoing at least six reflections within the light folding element 2, exits the light folding element 2 through the exit surface 22; the at least six reflections include one reflection on the deflecting and reflecting surface 23.

[0124] In this embodiment, the optical lens 10 is provided with a light folding element 2 which is roughly arranged on a plane perpendicular to the height direction Z of the optical lens 10 (i.e., the XY plane). The light folding element 2 changes the propagation direction of the light emitted from the lens group 1 and folds the light path. The height of the light folding element 2 is much smaller than the back focal length of the optical lens 10, thereby reducing the height of the optical lens 10 and the camera module, which is conducive to miniaturization.

[0125] For example, the height H of the light folding element 2 is its dimension in the height direction Z of the optical lens 10, the length L of the light folding element 2 is its dimension in the length direction Y of the optical lens 10, and the width of the light folding element 2 is its dimension in the width direction X of the optical lens 10. The thickness of the light folding element 2 can be smaller than the length of the light folding element 2. In this case, the height of the optical lens 10 and the camera module 200 is further reduced, which is conducive to miniaturization.

[0126] In some examples, the first direction is parallel to the length direction Y of the optical lens 10. In this case, the dimension of the light folding element 2 in the first direction is the length L of the light folding element 2. In the embodiment of the present application, because the extension direction of the light folding element 2 is deflected at the second portion 2b, the extension direction (first direction) of the first portion 2a of the light folding element 2 intersects the extension direction (second direction) of the third portion 2c, and the light folding element 2 undergoes structural bending. Therefore, the dimension of the light folding element 2 in the first direction is reduced, and the length L of the light folding element 2 in the length direction Y of the optical lens 10 is shortened. This effectively reduces the module length of the optical lens 10 and the camera module 200, facilitating a miniaturized design.

[0127] Furthermore, because the extension direction (first direction) of the first portion 2a of the light folding element 2 intersects the extension direction (second direction) of the third portion 2c, the light folding element 2 undergoes structural bending. Therefore, when the length of the light folding element 2 in the longitudinal direction Y of the optical lens 10 is limited, the extension length of the light folding element 2 (i.e., the length of the light folding element 2 extending from the object-side end to the image-side end) can be increased by increasing the length of the third portion 2c, thereby increasing the number of optical path folds and / or the optical length within the light folding element 2, thereby facilitating the telephoto design of the optical lens 10. In the embodiment of the present application, the optical lens 10, by designing the shape of the light folding element 2 and reflecting light at least six times within the light folding element 2, enables the light folding element 2 to have a long optical length while being compact, thereby facilitating the telephoto design of the optical lens 10.

[0128] It can be understood that the at least six reflections of the light in the light folding element 2 include one reflection on the deflecting reflection surface 23 and at least five reflections on the remaining surfaces of the light folding element 2. The reflection of the light on the deflecting reflection surface 23 is mainly used to deflect the light path along with the structural bending of the light folding element 2 so that the light continues to propagate within the light folding element 2; the at least five reflections of the light on the remaining surfaces of the light folding element 2 are mainly used to fold the light path to increase the optical path.

[0129] Please refer to Figures 5A to 5C in combination. Figure 5A is a top view of the light folding element 2 shown in Figure 4 in some embodiments, Figure 5B is a top view of the light folding element 2 shown in Figure 4 in other embodiments, and Figure 5C is a top view of the light folding element 2 shown in Figure 4 in other embodiments.

[0130] In some embodiments, a first angle α is formed between the first direction and the second direction, and the first angle α satisfies the following: 50° ≤ α ≤ 150°. For example, the value of the first angle α can be 60°, 70°, 82°, 85°, 90°, 95°, 110°, 130°, etc. In some examples, the first angle α satisfies the following: 70° ≤ α ≤ 135°. In some examples, 70° ≤ α ≤ 90°.

[0131] In this embodiment, by setting the range of the first angle α, the length L of the light folding element 2 in the first direction can be significantly shortened, and the interference between the incident light path and the outgoing light path in the light folding element 2 can be reduced. In addition, when the lens group 1, the light folding element 2 and the image sensor 20 are compactly arranged, mechanical interference between the lens group 1 and the image sensor 20 module can be avoided, thereby ensuring mechanical reliability.

[0132] As shown in FIG5A , when the first angle α is 90°, the second direction is perpendicular to the first direction, and the third portion 2c is bent perpendicularly relative to the first portion 2a. In this case, the length L of the optical folding element 2 in the first direction includes the length of the first portion 2a in the first direction and the length of the second portion 2b in the first direction.

[0133] As shown in Figure 5B, when the first angle α is less than 90°, the third part 2c is slightly biased toward the first part 2a when it is bent relative to the first part 2a, and the length L of the optical folding element 2 in the first direction includes the length of the first part 2a in the first direction and the length of the second part 2b in the first direction.

[0134] As shown in Figure 5C, when the first angle α is greater than 90°, the third part 2c deviates slightly from the first part 2a when it is bent relative to the first part 2a, and the length L of the optical folding element 2 in the first direction includes the length of the first part 2a in the first direction, the length of the second part 2b in the first direction, and the length of the part of the third part 2c protruding relative to the second part 2b in the first direction.

[0135] In the embodiment of the present application, when designing the specific shape of the light folding element 2, the optical lens 10 can simultaneously consider the desired extension length of the light folding element 2, the size and relative position relationship of the lens group 1 and the image sensor 20, so as to take into account both the miniaturization requirements and the reasonable layout requirements between components.

[0136] In addition, in the embodiment of the present application, the optical folding element 2 is a roughly "L"-shaped strip structure, which is easy to process and has a high yield. In some examples, the optical folding element 2 can be an integrally formed structural member. In other examples, the optical folding element 2 can also be an integrated structure assembled by several structural members. For example, the first part 2a and the second part 2b can be designed as an integrally formed structural member, and the third part 2c can be bonded to the second part 2b; or, the second part 2b and the third part 2c can be designed as an integrally formed structural member, and the first part 2a can be bonded to the second part 2b; or, a part of the second part 2b can be integrally formed with the first part 2a, and the other part can be integrally formed with the third part 2c, and the two integrally formed structural members can be bonded; or, the first part 2a, the second part 2b and the third part 2c can be bonded together in sequence. The embodiment of the present application does not strictly limit the molding method and structure of the optical folding element 2.

[0137] In some embodiments, as shown in Figures 5A to 5C, a first position P1 on the incident surface 21 is spaced from a second position P2 along an extension line of the first direction to the deflecting reflective surface 23. The first position P1 and the second position P2 form a first spacing S1, and the second position P2 and a third position P3 on the exit surface 22 form a second spacing S2. The first spacing S1 and the second spacing S2 satisfy the following: 13mm≤S1+S2≤47mm. For example, the value of S1+S2 can be 20mm, 22mm, 25mm, 25.2mm, 28mm, 32mm, 37mm, 25.2mm, 41mm, etc. In some examples, the first spacing S1 and the second spacing S2 satisfy the following: 17.5mm≤S1+S2≤42.5mm.

[0138] In this embodiment, by controlling the first distance S1 and the second distance S2, the optical lens 10 can be placed in a telephoto range, enabling telephoto photography, and having a larger aperture and higher image quality.

[0139] Exemplarily, the first position P1 and the third position P3 form a third interval S3 in the first direction.

[0140] In some examples, as shown in FIG5A and FIG5B , a first spacing S1 between the first position P1 and the second position P2, a second spacing S2 between the second position P2 and the third position P3, and a third spacing S3 between the first position P1 and the third position P3 in the first direction satisfy the following conditions: S3 ≤ S1, and 50% ≤ S1 / (S1+S2) ≤ 90%, or 50% ≤ S1 / (S1+S2) ≤ 80%. For example, the value of S1 / (S1+S2) can be 67%, 75%, 80%, 85%, etc.

[0141] In other examples, as shown in FIG5C , a first spacing S1 between the first position P1 and the second position P2, a second spacing S2 between the second position P2 and the third position P3, and a third spacing S3 between the first position P1 and the third position P3 in the first direction satisfy the following conditions: S1 ≤ S3, and 50% ≤ S3 / (S1+S2) ≤ 90%, or 50% ≤ S3 / (S1+S2) ≤ 80%. For example, the value of S3 / (S1+S2) can be 67%, 75%, 80%, 85%, etc.

[0142] In this embodiment, by setting the ratio of S1 / (S1+S2) when S3≤S1 and setting the ratio of S3 / (S1+S2) when S1≤S3, the length of the optical folding element 2 in the first direction can be reduced, which is beneficial to the miniaturization design of the optical lens 10 and the camera module 200, and at the same time, the mechanical interference between the lens group 1 and the image sensor 20 module can be avoided, thereby ensuring the reliability of the mechanism.

[0143] Please refer to Figures 3, 4 and 6. Figure 6 is a schematic diagram of the equivalent unfolded optical path of the light folding element 2 shown in Figure 4. In the equivalent optical path, the distance S between the optical axis O of the lens group 1 and the output optical axis O' satisfies: S = S1 + S2.

[0144] In some embodiments, the light folding element 2 may include a top surface 24 and a bottom surface 25 arranged in parallel, with the top surface 24 and the bottom surface 25 arranged parallel to the optical axis O of the lens assembly 1. In this case, the top surface 24 and the bottom surface 25 of the light folding element 2 are arranged in the height direction of the telephoto lens, and the distance between the top surface 24 and the bottom surface 25 is the height H of the light folding element 2. For example, the incident surface 21 is located on the top surface 24, and the exit surface 22 is located on the top surface 24. In this case, the lens assembly 1 and the image sensor 20 are located on the same side of the light folding element 2, and the lens assembly 1 and the image sensor 20 can reuse the space in the height direction, thereby facilitating the miniaturization of the camera module 200.

[0145] The deflecting reflective surface 23 connects the top surface 24 and the bottom surface 25. The deflecting reflective surface 23 is perpendicular to the top surface 24. The light folding element 2 also includes a first reflective surface 26 and a second reflective surface 27. The first reflective surface 26 is located in the first portion 2a and connects the top surface 24 and the bottom surface 25. The second reflective surface 27 is located in the third portion 2c and connects the top surface 24 and the bottom surface 25. After light enters the light folding element 2, it undergoes a first reflection on the first reflective surface 26, at least three reflections on the top surface 24 and the bottom surface 25, one reflection on the deflecting reflective surface 23, and a final reflection on the second reflective surface 27. At this point, the light undergoes at least six reflections within the light folding element 2.

[0146] The reflection occurring on the deflecting and reflecting surface 23 may occur between one reflection occurring on the top surface 24 and one reflection occurring on the bottom surface 25. For example, the at least six reflections of light within the light folding element 2 may also include: a second reflection occurring on the top surface 24, a third reflection occurring on the bottom surface 25, a fourth reflection occurring on the deflecting and reflecting surface 23, and a fifth reflection occurring on the top surface 24; or a second reflection occurring on the top surface 24, a third reflection occurring on the deflecting and reflecting surface 23, a fourth reflection occurring on the bottom surface 25, a fifth reflection occurring on the top surface 24, and so on. In this case, the deflecting and reflecting surface 23 is positioned approximately in the middle of the optical path of the light folding element 2, thereby effectively reducing the length of the light folding element 2.

[0147] Among them, in Figure 6 and the subsequent figures of this application, in the schematic diagram of the equivalent expanded light path of the light folding element 2, the reflection of the light on the first reflection surface 26, the second reflection surface 27, the top surface 24 and the bottom surface 25 are mainly presented, and the reflection of the light at the deflection reflection surface 23 is not presented.

[0148] In some embodiments, the light folding element 2 may further include a first side surface 28 and a second side surface 29. The first side surface 28 and the second side surface 29 are located in the first portion 2a, facing each other, and both connected to the top surface 24, the bottom surface 25, and the first reflective surface 26. The top surface 24 and the bottom surface 25 are located in the region of the first portion 2a, and both the first side surface 28 and the second side surface 29 are parallel to the extension direction of the first portion 2a, that is, parallel to the first direction. In some examples, the first side surface 28 and the second side surface 29 may be parallel. In this case, the cross-section of the first portion 2a perpendicular to the first direction may be rectangular. In other examples, the first side surface 28 and the second side surface 29 may form an angle, in which case the cross-section of the first portion 2a perpendicular to the first direction may be trapezoidal. In some examples, the second side surface 29 may further be connected to the deflecting reflective surface 23.

[0149] In some embodiments, the light folding element 2 may further include a third side surface 210 and a fourth side surface 220. The third side surface 210 and the fourth side surface 220 are located in the third portion 2c, facing each other, and both connected to the top surface 24, the bottom surface 25, and the second reflective surface 27. The top surface 24 and the bottom surface 25 are located in the third portion 2c, and both the third side surface 210 and the fourth side surface 220 are parallel to the extension direction of the third portion 2c, that is, parallel to the second direction. In some examples, the third side surface 210 and the fourth side surface 220 may be parallel. In this case, the cross-section of the third portion 2c perpendicular to the second direction may be rectangular. In other examples, the third side surface 210 and the fourth side surface 220 may form an angle between them, in which case the cross-section of the third portion 2c perpendicular to the second direction may be trapezoidal. In some examples, the fourth side surface 220 may further be connected to the deflecting reflective surface 23.

[0150] In some embodiments, the second portion 2b may be in the shape of a triangular prism. In other embodiments, the second portion 2b may also be in the shape of a trapezoidal column or a column of other shapes, which is not strictly limited in the present embodiment.

[0151] For ease of description, the reflection of light on the deflecting and reflecting surface 23 of the light folding element 2 is referred to as deflection reflection, while the reflection of light on other surfaces of the light folding element 2 (e.g., the first reflective surface 26, the second reflective surface 27, the top surface 24, and the bottom surface 25) is referred to as folding reflection. Thus, light undergoes one deflection reflection and at least five folding reflections in the light folding element 2.

[0152] In some embodiments, a second angle β is formed between the first reflective surface 26 and the incident surface 21. The second angle β satisfies the following: 22° ≤ β ≤ 40°. For example, the value of the first angle α can be 24°, 28°, 30°, 31°, 33°, 35°, 36.5°, etc. In some examples, the second angle β satisfies the following: 25° ≤ β ≤ 37°.

[0153] In this embodiment, the optical lens 10 controls the optical path direction of light entering the light folding element 2 by limiting the range of the second angle β, allowing the light to undergo at least five folds and reflections within the light folding element 2. This effectively increases the optical path, achieving a telephoto and compact design, and reduces stray light within the optical lens 10, thereby improving the imaging quality of the optical lens 10. However, if the second angle β is too large, the height H of the light folding element 2 becomes large, hindering the reduction of the height of the optical lens 10. If the second angle β is too small, the light cannot meet the requirement of total internal reflection within the light folding element 2, hindering light transmission and imaging.

[0154] In some embodiments, the included angle between the second reflective surface 27 and the emitting surface 22 may be equal to the second included angle β.

[0155] In some embodiments, the field of view (FOV) of the optical lens 10 may satisfy: FOV ≤ 30°. For example, the field of view (FOV) may be 9°, 10.2°, 11°, 12°, 14°, 16°, etc. In some examples, the field of view (FOV) may satisfy: FOV ≤ 20°.

[0156] In this embodiment, by designing the value of the field of view FOV of the optical lens 10, the light can be smoothly folded and reflected at least five times in the light folding element 2, thereby achieving telephoto shooting, and can fully compress the length dimensions of the light folding element 2 and the optical lens 10, which is conducive to miniaturization design.

[0157] In some embodiments, the system focal length EFL of the optical lens 10 may satisfy: 20 mm ≤ EFL ≤ 60 mm. For example, the system focal length EFL may be 28 mm, 32 mm, 33 mm, 35 mm, 41 mm, 43 mm, etc. In some examples, the system focal length EFL may satisfy: 30 mm ≤ EFL ≤ 50 mm.

[0158] In this embodiment, the optical lens 10 adopts the architecture of lens group 1 + light folding element 2. By limiting the system focal length EFL of the optical lens 10, the optical lens 10 can achieve the desired telephoto shooting, and the system focal length EFL corresponds to a larger back focal length, which can be achieved by at least five folding reflections of light in the light folding element 2, and the length dimension of the light folding element 2 can be further compressed by one deflection reflection, so that the optical lens 10 can take into account both the requirements of telephoto shooting and the requirements of module miniaturization.

[0159] In the embodiments of the present application, the design of the field of view (FOV) of the optical lens 10, the design of the system focal length (EFL) of the optical lens 10, the design of the size of the image sensor 20, and the design of the number of folding reflections of the light folding element 2 are interrelated and influence each other. By combining the design of these parameters, the optical system can have an optimal field of view and sensor range, better achieving telephoto and miniaturization, and also achieving better imaging quality. The half-sensor diagonal Y of the image sensor 20 corresponds to the image height, which is: image height = EFL × tan(FOV / 2).

[0160] In some embodiments, the total optical length TTL of the optical lens 10 and the system focal length EFL may satisfy: 0.7 ≤ TTL / EFL ≤ 1.8. For example, the value of TTL / EFL may be 0.8, 1.0, 1.1, 1.2, 1.3, 1.4, 1.6, etc. In some examples, TTL / EFL may satisfy: 0.9 ≤ TTL / EFL ≤ 1.5.

[0161] In this embodiment, the light entering the optical lens 10 is reflected and folded multiple times by the light folding element 2, so that the ratio of the total optical length of the optical lens 10 to the effective focal length of the optical lens 10 can meet the specified conditions, thereby making the optical lens 10 have a longer focal length to achieve a good long-range shooting effect, and enabling the miniaturization design of the optical lens 10 to be realized.

[0162] In some embodiments, the total optical path length PL of the light folding element 2 and the system focal length EFL satisfy the following relationship: 0.5 ≤ PL / EFL ≤ 1.5. For example, the value of PL / EFL can be 0.8, 0.9, 1.0, 1.1, 1.2, etc. In some examples, the value of PL / EFL can satisfy the following relationship: 0.7 ≤ PL / EFL ≤ 1.3.

[0163] In this embodiment, by limiting the ratio PL / EFL of the total optical path length PL of the light folding element 2 to the system focal length EFL to within the range of 0.5 to 1.5, the light folding element 2 achieves multiple folding of the optical path, resulting in a longer optical path and shorter physical length for the optical lens 10, facilitating a compact design. PL / EFL can be used to design the total optical path length PL of the light folding element 2 to be suitable for the system focal length EFL based on the desired field of view (FOV) of the optical lens 10. If PL / EFL is less than 0.5, the total optical path length PL of the light folding element 2 becomes shorter relative to the system focal length EFL, and the portion of the optical path in the optical lens 10 that is not accompanied by multiple reflections increases, thereby weakening the effect of folding the optical path by the light folding element 2 to reduce module size. If PL / EFL is greater than 1.5, the ratio of the total optical path length PL of the light folding element 2 to the system focal length EFL becomes too large, making it impossible to secure the space required for arranging lenses to ensure optical performance, thus failing to achieve the desired optical performance.

[0164] In some embodiments, lens assembly 1 includes a first lens L1 closest to the object side. The focal length F1 of first lens L1 and the system focal length EFL of optical lens system 10 may satisfy the following relationship: 0.2 ≤ F1 / EFL ≤ 0.7. For example, the value of F1 / EFL may be 0.24, 0.3, 0.4, 0.45, 0.54, etc. In some examples, the value of F1 / EFL may satisfy the following relationship: 0.25 ≤ F1 / EFL ≤ 0.5.

[0165] In this embodiment, by limiting the ratio of the focal length F1 of the first lens L1 to the system focal length EFL of the optical lens 10 within the range of 0.2 to 0.7, the light focusing effect of the first lens L1 can be made suitable for the optical lens 10, so that the total optical path length of the lens group 1 and the total optical path length of the light folding element 2 are both appropriate, thereby avoiding the module size of the optical lens 10 being too large, and at the same time, the optical lens 10 also has better optical performance and better imaging quality.

[0166] In some embodiments, a reflective coating may be provided on at least one reflective surface of the light folding element 2 to increase the light reflection effect and improve the light utilization efficiency.

[0167] In some embodiments, the lenses in the lens group 1 may be made of plastic or glass, or some lenses may be made of plastic and some lenses may be made of glass.

[0168] In some embodiments, the object-side surface or the image-side surface of the lens in the lens group 1 may be a spherical surface or an aspherical surface.

[0169] In some embodiments, when the object-side surfaces and / or image-side surfaces of some lenses in the lens group 1 are aspherical, the object-side surfaces and / or image-side surfaces of some lenses may be defined using, but not limited to, the following aspherical surface formula:

[0170] Where z is the relative distance between a point on the aspheric surface and the intersection of the point r from the optical axis O and the tangent plane on the aspheric optical axis O; r is the vertical distance between the point on the aspheric curve and the optical axis O; c is the curvature; k is the cone coefficient; α i is the i-th order aspheric coefficient.

[0171] In the aforementioned embodiments, the light may be folded and reflected an odd number of times within the light folding element 2, such as five times in the embodiment shown in FIG6 , or seven or nine times in other embodiments. In this case, the exit surface 22 and the incident surface 21 are located on the same side of the light folding element 2, for example, both located on the top surface 24.

[0172] Please refer to Figures 7A and 7B . Figure 7A is a schematic diagram of the structure of the camera module 200 shown in Figure 1 in other embodiments, and Figure 7B is a schematic diagram of the equivalent unfolded optical path of the light folding element 2 of the camera module 200 shown in Figure 7A . This embodiment can include most of the technical features of the previous embodiment. The following mainly describes the differences between the two embodiments, and the common features are not repeated here.

[0173] In some embodiments, light can be folded and reflected an even number of times within the light folding element 2, such as six or eight times. In this case, the exit surface 22 and the incident surface 21 of the light folding element 2 are located on opposite sides of the light folding element 2. For example, the incident surface 21 is located on the top surface 24, and the exit surface 22 is located on the bottom surface 25. In this way, the lens assembly 1 and the image sensor 20 are also located on opposite sides of the light folding element 2.

[0174] In the aforementioned embodiment, the structure of the optical folding element 2 is bent once, and the optical path is deflected once in a top view of the optical folding element 2. In other embodiments of the present application, the structure of the optical folding element 2 may be bent more than twice, and the optical path may be deflected more than twice in a top view of the optical folding element 2. For example, the optical folding element 2 may be a roughly U-shaped strip structure. In other embodiments, the optical folding element 2 may be other types of structural components in addition to being a prism, and this embodiment of the present application is not strictly limited to this.

[0175] Referring again to FIG. 3 , in some embodiments, during the focusing process of the camera module 200, the lens assembly 1, at least one lens in the lens assembly 1, or the image sensor 20 can move in a direction parallel to the optical axis O of the lens assembly 1. In this embodiment, the camera module 200 can achieve autofocus through the movement of the lens assembly 1, the lenses in the lens assembly 1, or the image sensor 20, thereby achieving better imaging quality and a better shooting experience.

[0176] During the anti-shake process of the camera module 200, the lens group 1, at least one lens in the lens group 1, or the image sensor 20 moves on a plane perpendicular to the optical axis O of the lens group 1. In this embodiment, the camera module 200 can achieve optical anti-shake through the movement of the lens group 1, the lenses in the lens group 1, or the image sensor 20, thereby obtaining better imaging quality and shooting experience.

[0177] Exemplarily, the lens assembly 1 and the image sensor 20 are located on the same side of the light folding element 2, and the direction in which light enters the image sensor 20 is parallel to the optical axis O of the lens assembly 1. In other embodiments, the direction in which light enters the image sensor 20 is also not parallel to the optical axis O of the lens assembly 1, and this embodiment of the present application is not strictly limited to this.

[0178] The following, combined with accompanying figures, data, and simulation results, presents possible implementations of the camera module 200 and optical lens 10 shown in FIG3 . To more clearly illustrate the optical path of the central field of view, the optical folding element 2 in FIG8A , FIG9A , and FIG10A below is illustrated using an equivalent unfolded structure to present the equivalent unfolded optical path.

[0179] First embodiment

[0180] Please refer to FIG. 3 , FIG. 4 and FIG. 8A in combination. FIG. 8A is a schematic diagram of an equivalent expanded optical path of the camera module 200 shown in FIG. 3 in the first embodiment.

[0181] In the embodiment of the present application, the camera module 200 may include an optical lens 10, an image sensor 20, and a filter 30. Light reflected from the object is refracted by the optical lens 10, passes through the filter 30, and is incident on the image sensor 20 to form an image.

[0182] Illustratively, the optical lens 10 includes a lens group 1 and a light folding element 2 , and the light folding element 2 is located on the image side of the lens group 1 .

[0183] Lens assembly 1 has an optical axis O, and the height direction Z of optical lens 10 is parallel to the optical axis O of lens assembly 1. Lens assembly 1 includes a first lens L1, a second lens L2, and a third lens L3 arranged from the object side to the image side. First lens L1 has positive refractive power, second lens L2 has positive refractive power, and third lens L3 has negative refractive power.

[0184] The light folding element 2 includes a first portion 2a, a second portion 2b, and a third portion 2c connected in sequence from the object side to the image side. The light entering the light folding element 2 passes through the first portion 2a, the second portion 2b, and the third portion 2c in sequence and then exits. The first portion 2a can extend along a first direction, and the third portion 2c can extend along a second direction. The planes in which the first and second directions lie are perpendicular to the optical axis O of the lens group 1, and the second direction intersects with the first direction. The planes in which the first and second directions lie are perpendicular to the optical axis O of the lens group 1, that is, perpendicular to the height direction Z of the optical lens 10. The light folding element 2 is roughly arranged on a plane perpendicular to the height direction Z of the optical lens 10 (that is, an XY plane). The light folding element 2 can be a prism.

[0185] The light folding element 2 may include a top surface 24 and a bottom surface 25 arranged in parallel. The top surface 24 and the bottom surface 25 are arranged in a direction parallel to the optical axis O of the lens assembly 1. The light folding element 2 includes an incident surface 21, an exit surface 22, and a deflecting and reflecting surface 23 (not shown in FIG8A ). The incident surface 21 is located in the first portion 2a and is located on the top surface 24; the exit surface 22 is located in the third portion 2c and is located on the top surface 24; the deflecting and reflecting surface 23 is located in the second portion 2b and connects the top surface 24 and the bottom surface 25. The deflecting and reflecting surface 23 is parallel to the optical axis O of the lens assembly 1 and perpendicular to the top surface 24.

[0186] The light folding element 2 further includes a first reflective surface 26 and a second reflective surface 27. The first reflective surface 26 is located in the first portion 2a and connects the top surface 24 and the bottom surface 25. The second reflective surface 27 is located in the third portion 2c and connects the top surface 24 and the bottom surface 25. After light enters the light folding element 2, it undergoes a first reflection at the first reflective surface 26, three reflections at the top surface 24 and the bottom surface 25, one reflection at the deflecting reflective surface 23 (not shown in FIG. 8A ), and a final reflection at the second reflective surface 27. At this point, the light undergoes six reflections within the light folding element 2, including one deflection reflection and five folding reflections.

[0187] In the embodiment of the present application, after being converged by the lens assembly 1, the light enters the light folding element 2 through the incident surface 21 of the light folding element 2. After being reflected six times within the light folding element 2, the light is emitted through the exit surface 22 of the light folding element 2 and is imaged on the image sensor 20. The optical lens 10 uses the light folding element 2 to reflect the converged light of the lens assembly 1 multiple times, folding the optical path. This shortens the physical space between the lens assembly 1 and the image sensor 20, thereby reducing the module size of the optical lens 10 and achieving miniaturization.

[0188] Among them, the optical folding element 2 is roughly arranged on a plane perpendicular to the height direction Z of the optical lens 10 (that is, the XY plane). The height of the optical folding element 2 is much smaller than the back focal length of the optical lens 10, thereby reducing the height of the optical lens 10 and the camera module 200, which is conducive to miniaturization.

[0189] In addition, since the extension direction of the optical folding element 2 is deflected in the second part 2b, the extension direction (first direction) of the first part 2a of the optical folding element 2 intersects with the extension direction (second direction) of the third part 2c, and the optical folding element 2 undergoes structural bending. Therefore, the size of the optical folding element 2 in the first direction is reduced, and the length dimension of the optical folding element 2 in the length direction Y of the optical lens 10 is reduced. Therefore, the module length of the optical lens 10 and the camera module 200 can be effectively reduced, which is conducive to miniaturization design.

[0190] In the embodiment of the present application, the optical lens 10 designs the shape of the light folding element 2 and the six reflections of light in the light folding element 2 so that the light folding element 2 can have a longer optical path in a smaller volume, which is beneficial to the telephoto design of the optical lens 10.

[0191] Please refer to Table 1a, which shows the radius of curvature, thickness, refractive index (Nd), Abbe number (Vd), and effective radius of each lens, light folding element 2, and filter 30 in a possible embodiment of the camera module 200 shown in Figures 3 and 8A. Thickness includes the thickness of the structure itself and the spacing between structures. INF refers to infinity. STO stands for aperture stop.

[0192] Table 1a

[0193] Please refer to Table 1b, which shows the aspheric coefficients of each lens in a possible embodiment of the camera module 200 shown in FIG. 3 and FIG. 8A.

[0194] Table 1b

[0195] Among them, K is the quadratic surface constant, and symbols such as A4, A6, A8, A10, and A12 represent aspheric coefficients.

[0196] In this embodiment, the aspheric surface of the optical lens 10 in Table 1a can be defined by, but not limited to, the following aspheric surface formula:

[0197] Where z is the relative distance between a point on the aspheric surface and the intersection of the point r from the optical axis O and the tangent plane on the aspheric optical axis O; r is the vertical distance between the point on the aspheric curve and the optical axis O; c is the curvature; k is the cone coefficient; α i is the i-th order aspheric coefficient.

[0198] Please refer to Table 1c, which lists parameters of the camera module 200 shown in Figures 3 and 8A in a possible embodiment. In Table 1c, Y is the half-sensor diagonal (i.e., image height), EFL is the effective focal length of the optical lens 10, TTL is the total optical length of the optical lens 10, PL is the total optical path length of the light folding element 2, F1 is the focal length of the first lens L1, F2 is the focal length of the second lens L2, F3 is the focal length of the third lens L3, α is the first angle between the first direction and the second direction, β is the second angle between the incident surface 21 and the first reflective surface 26, FOV is the field of view of the optical lens 10, Fno is the aperture number of the optical lens 10, and S is the distance between the optical axis O of the lens group 1 and the output optical axis O' in the equivalent optical path.

[0199] Table 1c

[0200] Please refer to FIG. 8B , which is a simulation effect diagram of the camera module 200 shown in FIG. 8A in a possible embodiment.

[0201] 8B includes an axial chromatic aberration curve, an astigmatism field curvature curve, and a distortion curve. The axial chromatic aberration curve represents the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical system. The reference wavelengths of the axial chromatic aberration curve are 486.1 nm, 587.6 nm, and 656.3 nm. Its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical lens 10; its horizontal coordinate is the deviation value along the optical axis O, and the vertical coordinate is the normalized coordinate at the pupil. The values ​​in FIG8B are all small, and the axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature curve represents the meridional image curvature and the sagittal image curvature, which are used to illustrate the deviation of the convergence point of fine light beams of different fields of view from the ideal imaging plane. The solid line is the meridional beam, the dotted line is the sagittal beam, the horizontal coordinate is the deviation value along the optical axis O, and the vertical coordinate is the corresponding field of view. The reference wavelength of the astigmatism curve can be 486.1nm, 587.6nm, and 656.3nm. When a field of view value is too large, the image quality of the field of view is poor or there are high-order aberrations. As shown in Figure 8B, the field curvature in both directions is small, and the system has a good depth of focus. The distortion curve represents the relative deviation of the convergence point of light beams in different fields of view (actual image height) from the ideal image height. The reference wavelength of the distortion curve can be 486.1nm, 587.6nm, and 656.3nm, which are all within 1% as shown in Figure 8B, ensuring that there is no obvious deformation of the picture. According to Figure 8B, the camera module 200 provided in this embodiment can achieve good imaging quality. Among them, in Figure 8B, since the distortion curve is very close to the vertical coordinate, there is an overlapping part with the vertical coordinate in the figure.

[0202] The camera module 200 provided in this embodiment has an optical lens 10 with a field of view angle FOV of 12.4° when the object distance is infinite, a system focal length EFL of 33 mm, a total optical length TTL of 36.266 mm, and a total optical path length PL of 29.63 mm of the optical folding element 2. The light undergoes one deflection reflection and five folding reflections in the optical folding element 2, so that the optical lens 10 group has the characteristics of long focal length and miniaturization, and the camera module 200 can have good imaging quality.

[0203] Second embodiment

[0204] Please refer to FIG. 3 , FIG. 4 and FIG. 9A in combination. FIG. 9A is a schematic diagram of an equivalent expanded optical path of the camera module 200 shown in FIG. 3 in the second embodiment.

[0205] In the embodiment of the present application, the camera module 200 may include an optical lens 10, an image sensor 20, and a filter 30. Light reflected from the object is refracted by the optical lens 10, passes through the filter 30, and is incident on the image sensor 20 to form an image.

[0206] Illustratively, the optical lens 10 includes a lens group 1 and a light folding element 2 , and the light folding element 2 is located on the image side of the lens group 1 .

[0207] The lens assembly 1 has an optical axis O, and the height direction Z of the optical lens 10 is parallel to the optical axis O of the lens assembly 1. The lens assembly 1 includes a first lens L1 and a second lens L2 arranged from the object side to the image side. The first lens L1 has positive refractive power, and the second lens L2 has negative refractive power.

[0208] The light folding element 2 includes a first portion 2a, a second portion 2b, and a third portion 2c connected in sequence from the object side to the image side. The light entering the light folding element 2 passes through the first portion 2a, the second portion 2b, and the third portion 2c in sequence and then exits. The first portion 2a can extend along a first direction, and the third portion 2c can extend along a second direction. The planes in which the first and second directions lie are perpendicular to the optical axis O of the lens group 1, and the second direction intersects with the first direction. The planes in which the first and second directions lie are perpendicular to the optical axis O of the lens group 1, that is, perpendicular to the height direction Z of the optical lens 10. The light folding element 2 is roughly arranged on a plane perpendicular to the height direction Z of the optical lens 10 (that is, an XY plane). The light folding element 2 can be a prism.

[0209] The light folding element 2 may include a top surface 24 and a bottom surface 25 arranged in parallel. The top surface 24 and the bottom surface 25 are arranged in a direction parallel to the optical axis O of the lens assembly 1. The light folding element 2 includes an incident surface 21, an exit surface 22, and a deflecting and reflecting surface 23 (not shown in FIG9A ). The incident surface 21 is located in the first portion 2a and is located on the top surface 24; the exit surface 22 is located in the third portion 2c and is located on the top surface 24; the deflecting and reflecting surface 23 is located in the second portion 2b and connects the top surface 24 and the bottom surface 25. The deflecting and reflecting surface 23 is parallel to the optical axis O of the lens assembly 1 and perpendicular to the top surface 24.

[0210] The light folding element 2 further includes a first reflecting surface 26 and a second reflecting surface 27. The first reflecting surface 26 is located in the first portion 2a and connects the top surface 24 and the bottom surface 25. The second reflecting surface 27 is located in the third portion 2c and connects the top surface 24 and the bottom surface 25. After light enters the light folding element 2, it undergoes a first reflection at the first reflecting surface 26, three reflections at the top surface 24 and the bottom surface 25, one reflection at the deflecting reflecting surface 23 (not shown in FIG. 9A ), and a final reflection at the second reflecting surface 27. At this point, the light undergoes six reflections within the light folding element 2, including one deflection reflection and five folding reflections.

[0211] In the embodiment of the present application, after being converged by the lens assembly 1, the light enters the light folding element 2 through the incident surface 21 of the light folding element 2. After being reflected six times within the light folding element 2, the light is emitted through the exit surface 22 of the light folding element 2 and is imaged on the image sensor 20. The optical lens 10 uses the light folding element 2 to reflect the converged light of the lens assembly 1 multiple times, folding the optical path. This shortens the physical space between the lens assembly 1 and the image sensor 20, thereby reducing the module size of the optical lens 10 and achieving miniaturization.

[0212] Among them, the optical folding element 2 is roughly arranged on a plane perpendicular to the height direction Z of the optical lens 10 (that is, the XY plane). The height of the optical folding element 2 is much smaller than the back focal length of the optical lens 10, thereby reducing the height of the optical lens 10 and the camera module 200, which is conducive to miniaturization.

[0213] In addition, since the extension direction of the optical folding element 2 is deflected in the second part 2b, the extension direction (first direction) of the first part 2a of the optical folding element 2 intersects with the extension direction (second direction) of the third part 2c, and the optical folding element 2 undergoes structural bending. Therefore, the size of the optical folding element 2 in the first direction is reduced, and the length dimension of the optical folding element 2 in the length direction Y of the optical lens 10 is reduced. Therefore, the module length of the optical lens 10 and the camera module 200 can be effectively reduced, which is conducive to miniaturization design.

[0214] In the embodiment of the present application, the optical lens 10 designs the shape of the light folding element 2 and the six reflections of light in the light folding element 2 so that the light folding element 2 can have a longer optical path in a smaller volume, which is beneficial to the telephoto design of the optical lens 10.

[0215] Please refer to Table 2a, which shows the radius of curvature, thickness, refractive index (Nd), Abbe number (Vd), and effective radius of each lens, light folding element 2, and filter 30 in a possible embodiment of the camera module 200 shown in Figures 3 and 9A. Thickness includes the thickness of the structure itself and the spacing between structures. INF refers to infinity. STO is the aperture stop.

[0216] Table 2a

[0217] Please refer to Table 2b, which shows the aspheric coefficients of each lens in a possible embodiment of the camera module 200 shown in Figures 3 and 9A.

[0218] Table 2b

[0219] Among them, K is the quadratic surface constant, and symbols such as A4, A6, A8, A10, and A12 represent aspheric coefficients.

[0220] In this embodiment, the aspheric surface of the optical lens 10 in Table 2a can be defined by, but not limited to, the following aspheric surface formula:

[0221] Where z is the relative distance between a point on the aspheric surface and the intersection of the point r from the optical axis O and the tangent plane on the aspheric optical axis O; r is the vertical distance between the point on the aspheric curve and the optical axis O; c is the curvature; k is the cone coefficient; α i is the i-th order aspheric coefficient.

[0222] Please refer to Table 2c, which lists parameters of the camera module 200 shown in Figures 3 and 9A in a possible embodiment. In Table 2c, Y is the half-sensor diagonal (i.e., image height), EFL is the effective focal length of the optical lens 10, TTL is the total optical length of the optical lens 10, PL is the total optical path length of the light folding element 2, F1 is the focal length of the first lens L1, F2 is the focal length of the second lens L2, α is the first angle between the first direction and the second direction, β is the second angle between the incident surface 21 and the first reflective surface 26, FOV is the field of view of the optical lens 10, Fno is the aperture number of the optical lens 10, and S is the distance between the optical axis O of the lens assembly 1 and the output optical axis O' in the equivalent optical path.

[0223] Table 2c

[0224] Please refer to FIG. 9B , which is a simulation effect diagram of the camera module 200 shown in FIG. 9A in a possible embodiment.

[0225] 9B includes an axial chromatic aberration curve, an astigmatism field curvature curve, and a distortion curve. The axial chromatic aberration curve represents the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical system. The reference wavelengths of the axial chromatic aberration curve are 486.1 nm, 587.6 nm, and 656.3 nm. Its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical lens 10; its horizontal coordinate is the deviation value along the optical axis O, and the vertical coordinate is the normalized coordinate at the pupil. The values ​​in FIG9B are all small, and the axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature curve represents the meridional image curvature and the sagittal image curvature, which are used to illustrate the deviation of the convergence point of fine light beams of different fields of view from the ideal imaging plane. The solid line is the meridional beam, the dotted line is the sagittal beam, the horizontal coordinate is the deviation value along the optical axis O, and the vertical coordinate is the corresponding field of view. The reference wavelength of the astigmatism curve can be 486.1nm, 587.6nm, and 656.3nm. When a field of view value is too large, the image quality of the field of view is poor or there are high-order aberrations. As shown in Figure 9B, the field curvature in both directions is small, and the system has a good depth of focus. The distortion curve represents the relative deviation of the convergence point of light beams in different fields of view (actual image height) from the ideal image height. The reference wavelength of the distortion curve can be 486.1nm, 587.6nm, and 656.3nm, which are all within 1% as shown in Figure 9B, ensuring that there is no obvious deformation of the picture. According to Figure 9B, the camera module 200 provided in this embodiment can achieve good imaging quality. Among them, in Figure 9B, since the distortion curve is very close to the vertical coordinate, there is an overlapping part with the vertical coordinate in the figure.

[0226] The camera module 200 provided in this embodiment has an optical lens 10 with a field of view angle FOV of 12.4° when the object distance is infinite, a system focal length EFL of 33 mm, a total optical length TTL of 39.92 mm, and a total optical path length PL of 33.3 mm of the optical folding element 2. The light undergoes one deflection reflection and five folding reflections in the optical folding element 2, so that the optical lens 10 group has the characteristics of long focal length and miniaturization, and the camera module 200 can have good imaging quality.

[0227] Third embodiment

[0228] Please refer to FIG. 3 , FIG. 4 and FIG. 10A . FIG. 10A is a schematic diagram of an equivalent expanded optical path of the camera module 200 shown in FIG. 3 in the third embodiment.

[0229] In the embodiment of the present application, the camera module 200 may include an optical lens 10, an image sensor 20, and a filter 30. Light reflected from the object is refracted by the optical lens 10, passes through the filter 30, and is incident on the image sensor 20 to form an image.

[0230] Illustratively, the optical lens 10 includes a lens group 1 and a light folding element 2 , and the light folding element 2 is located on the image side of the lens group 1 .

[0231] Lens assembly 1 has an optical axis O, and the height direction Z of optical lens 10 is parallel to the optical axis O of lens assembly 1. Lens assembly 1 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4, arranged from the object side to the image side. First lens L1 has positive refractive power, second lens L2 has positive refractive power, third lens L3 has negative refractive power, and fourth lens L4 has positive refractive power.

[0232] The light folding element 2 includes a first portion 2a, a second portion 2b, and a third portion 2c connected in sequence from the object side to the image side. The light entering the light folding element 2 passes through the first portion 2a, the second portion 2b, and the third portion 2c in sequence and then exits. The first portion 2a can extend along a first direction, and the third portion 2c can extend along a second direction. The planes in which the first and second directions lie are perpendicular to the optical axis O of the lens group 1, and the second direction intersects with the first direction. The planes in which the first and second directions lie are perpendicular to the optical axis O of the lens group 1, that is, perpendicular to the height direction Z of the optical lens 10. The light folding element 2 is roughly arranged on a plane perpendicular to the height direction Z of the optical lens 10 (that is, an XY plane). The light folding element 2 can be a prism.

[0233] The light folding element 2 may include a top surface 24 and a bottom surface 25 arranged in parallel. The top surface 24 and the bottom surface 25 are arranged in a direction parallel to the optical axis O of the lens assembly 1. The light folding element 2 includes an incident surface 21, an exit surface 22, and a deflecting and reflecting surface 23 (not shown in FIG10A ). The incident surface 21 is located in the first portion 2a and is located on the top surface 24; the exit surface 22 is located in the third portion 2c and is located on the top surface 24; the deflecting and reflecting surface 23 is located in the second portion 2b and connects the top surface 24 and the bottom surface 25. The deflecting and reflecting surface 23 is parallel to the optical axis O of the lens assembly 1 and perpendicular to the top surface 24.

[0234] The light folding element 2 further includes a first reflecting surface 26 and a second reflecting surface 27. The first reflecting surface 26 is located in the first portion 2a and connects the top surface 24 and the bottom surface 25. The second reflecting surface 27 is located in the third portion 2c and connects the top surface 24 and the bottom surface 25. After light enters the light folding element 2, it undergoes a first reflection at the first reflecting surface 26, five reflections at the top surface 24 and the bottom surface 25, one reflection at the deflecting reflecting surface 23 (not shown in FIG. 10A ), and a final reflection at the second reflecting surface 27. At this point, the light undergoes eight reflections within the light folding element 2, including one deflection reflection and seven folding reflections.

[0235] In the embodiment of the present application, after being converged by the lens assembly 1, the light enters the light folding element 2 through the incident surface 21 of the light folding element 2. After being reflected eight times within the light folding element 2, the light is emitted through the exit surface 22 of the light folding element 2 and is imaged on the image sensor 20. The optical lens 10 uses the light folding element 2 to reflect the converged light from the lens assembly 1 multiple times, folding the optical path. This shortens the physical space between the lens assembly 1 and the image sensor 20, thereby reducing the module size of the optical lens 10 and achieving miniaturization.

[0236] Among them, the optical folding element 2 is roughly arranged on a plane perpendicular to the height direction Z of the optical lens 10 (that is, the XY plane). The height of the optical folding element 2 is much smaller than the back focal length of the optical lens 10, thereby reducing the height of the optical lens 10 and the camera module 200, which is conducive to miniaturization.

[0237] In addition, since the extension direction of the optical folding element 2 is deflected in the second part 2b, the extension direction (first direction) of the first part 2a of the optical folding element 2 intersects with the extension direction (second direction) of the third part 2c, and the optical folding element 2 undergoes structural bending. Therefore, the size of the optical folding element 2 in the first direction is reduced, and the length dimension of the optical folding element 2 in the length direction Y of the optical lens 10 is reduced. Therefore, the module length of the optical lens 10 and the camera module 200 can be effectively reduced, which is conducive to miniaturization design.

[0238] In the embodiment of the present application, the optical lens 10 designs the shape of the light folding element 2 and the eight reflections of light in the light folding element 2 so that the light folding element 2 can have a longer optical path in a smaller volume, which is beneficial to the telephoto design of the optical lens 10.

[0239] Please refer to Table 3a, which shows the radius of curvature, thickness, refractive index (Nd), Abbe number (Vd), and effective radius of each lens, optical folding element 2, and filter 30 in a possible embodiment of the camera module 200 shown in Figures 3 and 10A. Thickness includes the thickness of the structure itself and the spacing between structures. INF refers to infinity. STO is the aperture stop.

[0240] Table 3a

[0241] Please refer to Table 3b, which shows the aspheric coefficients of each lens in a possible embodiment of the camera module 200 shown in Figures 3 and 10A.

[0242] Table 3b

[0243] Among them, K is the quadratic surface constant, and symbols such as A4, A6, A8, A10, and A12 represent aspheric coefficients.

[0244] In this embodiment, the aspheric surface of the optical lens 10 in Table 3a can be defined by, but not limited to, the following aspheric surface formula:

[0245] Where z is the relative distance between a point on the aspheric surface and the intersection of the point r from the optical axis O and the tangent plane on the aspheric optical axis O; r is the vertical distance between the point on the aspheric curve and the optical axis O; c is the curvature; k is the cone coefficient; α i is the i-th order aspheric coefficient.

[0246] Please refer to Table 3c, which lists parameters of the camera module 200 shown in Figures 3 and 10A in a possible embodiment. In Table 3c, Y is the half-sensor diagonal (i.e., image height), EFL is the effective focal length of the optical lens 10, TTL is the total optical length of the optical lens 10, PL is the total optical path length of the light folding element 2, F1 is the focal length of the first lens L1, F2 is the focal length of the second lens L2, F3 is the focal length of the third lens L3, F4 is the focal length of the fourth lens L4, α is the first angle between the first direction and the second direction, β is the second angle between the incident surface 21 and the first reflective surface 26, FOV is the field of view of the optical lens 10, Fno is the aperture number of the optical lens 10, and S is the distance between the optical axis O of the lens group 1 and the output optical axis O' in the equivalent optical path.

[0247] Table 3c

[0248] Please refer to FIG. 10B , which is a simulation effect diagram of the camera module 200 shown in FIG. 10A in a possible embodiment.

[0249] FIG10B includes an axial chromatic aberration curve, an astigmatism field curvature curve, and a distortion curve. The axial chromatic aberration curve represents the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical system. The reference wavelengths of the axial chromatic aberration curve are 486.1 nm, 587.6 nm, and 656.3 nm. Its physical meaning is the deviation of the light of the corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical lens 10; its horizontal coordinate is the deviation value along the optical axis O, and the vertical coordinate is the normalized coordinate at the pupil. The values ​​in FIG10B are all small, and the axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature curve represents the meridional image curvature and the sagittal image curvature, which are used to illustrate the deviation of the convergence point of fine light beams of different fields of view from the ideal imaging plane. The solid line is the meridional beam, the dotted line is the sagittal beam, the horizontal coordinate is the deviation value along the optical axis O, and the vertical coordinate is the corresponding field of view. The reference wavelength of the astigmatism curve can be 486.1nm, 587.6nm, and 656.3nm. When a field of view value is too large, the image quality of the field of view is poor or there are high-order aberrations. As shown in Figure 10B, the field curvature in both directions is small, and the system has a good depth of focus. The distortion curve represents the relative deviation of the convergence point of light beams in different fields of view (actual image height) from the ideal image height. The reference wavelength of the distortion curve can be 486.1nm, 587.6nm, and 656.3nm, which are all within 1% as shown in Figure 10B, ensuring that there is no obvious deformation of the picture. According to Figure 10B, the camera module 200 provided in this embodiment can achieve good imaging quality. Among them, in Figure 10B, since the distortion curve is very close to the ordinate, there is an overlapping part with the ordinate in the figure.

[0250] The camera module 200 provided in this embodiment has an optical lens 10 with a field of view angle FOV of 10.17° when the object distance is infinity, a system focal length EFL of 40.28 mm, a total optical length TTL of 53.87 mm, and a total optical path length PL of the light folding element 2 of 47.9 mm. The light undergoes one deflection reflection and seven folding reflections in the light folding element 2, so that the optical lens 10 group has the characteristics of long focal length and miniaturization, and the camera module 200 can have good imaging quality.

[0251] All of the above drawings are illustrative illustrations of this application. The drawings primarily illustrate portions of the product relevant to the embodiments of this application. The product may include other portions not shown in the drawings. Furthermore, the actual shape, location, size and proportion, configuration, and quantity of the components or structures of the product are not limited by the drawings.

[0252] The above embodiments are used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application.

[0253] In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other, and any combination of features in different embodiments is also within the protection scope of the present application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

Claims

1. An optical lens (10), characterized in that: It comprises a lens group (1) and a light folding element (2); The lens group (1) comprises at least one lens with positive optical power; The light folding element (2) is located on the image side of the lens group (1), and comprises a first part (2a), a second part (2b) and a third part (2c) connected in sequence from the object side to the image side, the first part (2a) extends along a first direction, the third part (2c) extends along a second direction, the planes where the first direction and the second direction are located are perpendicular to the optical axis (O) of the lens group (1), and the second direction intersects with the first direction; The light folding element (2) comprises an incident surface (21), a deflection reflection surface (23) and an exit surface (22); the incident surface (21) is located in the first part (2a) and faces the lens group (1); the deflection reflection surface (23) is located in the second part (2b) and is parallel to the optical axis (O) of the lens group (1); and the exit surface (22) is located in the third part (2c); After passing through the lens group (1), the external light enters the light folding element (2) through the incident surface (21), and after being reflected at least six times in the light folding element (2), it is emitted from the light folding element (2) through the exit surface (22); wherein the at least six reflections include one reflection occurring on the deflection reflection surface (23).

2. The optical lens (10) according to claim 1, characterized in that: A first angle α is formed between the first direction and the second direction, and the first angle α satisfies: 50°≤α≤150° or 70°≤α≤135°.

3. The optical lens (10) according to claim 1 or 2, characterized in that: The optical axis (O) of the lens group (1) intersects the incident surface (21) at the first position (P1), an extension line of the first position (P1) along the first direction intersects the deflection reflection surface (23) at a second position (P2), the light emitted from the exit surface (22) has an exit optical axis (O'), the exit optical axis (O') is parallel to the optical axis (O) of the lens group (1), and the exit optical axis (O') intersects the exit surface (22) at a third position (P3); A first distance S1 between the first position (P1) and the second position (P2) and a second distance S2 between the second position (P2) and the third position (P3) satisfy: 13mm≤S1+S2≤47mm, or, 17.5mm≤S1+S2≤42.5mm.

4. The optical lens (10) according to claim 1 or 2, characterized in that: The optical axis (O) of the lens group (1) intersects the incident surface (21) at the first position (P1), an extension line of the first position (P1) along the first direction intersects the deflection reflection surface (23) at a second position (P2), the light emitted from the exit surface (22) has an exit optical axis (O'), the exit optical axis (O') is parallel to the optical axis (O) of the lens group (1), and the exit optical axis (O') intersects the exit surface (22) at a third position (P3); A first spacing S1 between the first position (P1) and the second position (P2), a second spacing S2 between the second position (P2) and the third position (P3), and a third spacing S3 between the first position (P1) and the third position (P3) in the first direction satisfy: S3≤S1, and 50%≤S1 / (S1+S2)≤90%, or 50%≤S1 / (S1+S2)≤80%; or, S1≤S3, and 50%≤S3 / (S1+S2)≤90%, or 50%≤S3 / (S1+S2)≤80%.

5. The optical lens (10) according to any one of claims 1 to 4, characterized in that: The light folding element (2) comprises a top surface (22) and a bottom surface (25) arranged in parallel, the arrangement direction of the top surface (22) and the bottom surface (25) being parallel to the optical axis (O) of the lens group (1), the incident surface (21) being located on the top surface (22), and the exit surface (22) being located on the top surface (22) or the bottom surface (25); The deflection reflection surface (23) connects the top surface (22) and the bottom surface (25); The light folding element (2) further comprises a first reflecting surface (26) and a second reflecting surface (27), wherein the first reflecting surface (26) is located in the first portion (2a) and connects the top surface (22) and the bottom surface (25), and the second reflecting surface (27) is located in the third portion (2c) and connects the top surface (22) and the bottom surface (25); After the light enters the light folding element (2), it is reflected for the first time on the first reflecting surface (26), reflected at least three times on the top surface (22) and the bottom surface (25), and reflected for the last time on the second reflecting surface (27).

6. The optical lens (10) according to claim 5, characterized in that: A second angle β is formed between the first reflection surface (26) and the incident surface (21), and the second angle β satisfies: 22°≤β≤40° or 25°≤β≤37°.

7. The optical lens (10) according to any one of claims 1 to 6, characterized in that: The field of view angle FOV of the optical lens (10) satisfies: FOV≤30°, or FOV≤20°.

8. The optical lens (10) according to any one of claims 1 to 7, characterized in that: The system focal length EFL of the optical lens (10) satisfies: 20 mm ≤ EFL ≤ 60 mm, or 30 mm ≤ EFL ≤ 50 mm.

9. The optical lens (10) according to any one of claims 1 to 8, characterized in that: The total optical length TTL of the optical lens (10) and the system focal length EFL satisfy: 0.7≤TTL / EFL≤1.8, or 0.9≤TTL / EFL≤1.

5.

10. The optical lens (10) according to any one of claims 1 to 9, characterized in that: The total optical path length PL of the light folding element (2) and the system focal length EFL satisfy: 0.5≤PL / EFL≤1.

5.

11. The optical lens (10) according to any one of claims 1 to 10, characterized in that: The lens group (1) comprises a first lens closest to the object side, and the focal length F1 of the first lens and the system focal length EFL of the optical lens (10) satisfy: 0.2≤F1 / EFL≤0.7, or 0.25≤F1 / EFL≤0.

5.

12. A camera module (200), characterized in that: The optical lens (10) comprises an image sensor (20) and any one of claims 1 to 11, wherein the image sensor (20) is located on the image side of the optical lens (10).

13. The camera module (200) according to claim 12, characterized in that: During the focusing process of the camera module (200), the lens group (1), at least one lens in the lens group (1), or the image sensor (20) moves in a direction parallel to the optical axis (O) of the lens group (1).

14. The camera module (200) according to claim 12 or 13, characterized in that: During the anti-shake process of the camera module (200), the lens group (1), at least one lens in the lens group (1), or the image sensor (20) moves on a plane perpendicular to the optical axis (O) of the lens group (1).

15. An electronic device (1000), characterized in that: The invention comprises an image processor (300) and a camera module (200) according to any one of claims 12 to 14, wherein the image processor (300) is communicatively connected to the camera module (200), and the image processor (300) is used to obtain image data from the camera module (200) and process the image data.

Images