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

Technical Field

[0001] 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

[0002] Mobile phones, tablets and other portable devices are equipped with optical lenses for taking pictures or videos. Telephoto optical lenses can greatly improve 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 of the camera module also increases synchronously, making it difficult to install the camera module in miniaturized electronic devices. Therefore, it is necessary to provide an optical lens that can meet the design requirements of telephoto and miniaturization. Summary of the invention

[0003] 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.

[0004] In a first aspect, an embodiment of the present application provides an optical lens. The optical lens includes a lens group and an optical folding element. The lens group includes at least one lens with positive optical power, the optical folding element is located on the image side of the lens group, the optical 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 the first direction, the third part extends along the second direction, the planes where the first direction and the second direction are located are perpendicular to the optical axis of the lens group, and the second direction intersects with the first direction; the optical folding element includes an incident surface, a deflection reflection surface and an exit surface, the incident surface is located in the first part and is arranged facing the lens group, 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; after passing through the lens group, the external light enters the optical folding element from the incident surface, and after at least six reflections occur in the optical folding element, it is emitted from the optical folding element from the exit surface; wherein, the at least six reflections include one reflection occurring on the deflection reflection surface.

[0005] In this embodiment, the optical lens is provided with a light folding element which is roughly arranged on a plane (i.e., the XY plane) perpendicular to the height direction Z of the optical lens. 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.

[0006] Exemplarily, 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 may be less than the length of the optical folding element. In this case, the height of the optical lens and the camera module is further reduced, which is conducive to miniaturization.

[0007] In some examples, the first direction is parallel to the length direction of the optical lens, and in this case, the size of the optical folding element in the first direction is the length of the optical folding element. In the embodiment of the present application, since the extension direction of the optical folding element is deflected in the second part, the extension direction of the first part of the optical folding element (the first direction) intersects with the extension direction of the third part (the second direction), and the optical folding element is structurally bent, the size 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 reduced, so that the module length of the optical lens and the camera module can be effectively reduced, which is conducive to miniaturization design.

[0008] In addition, since the extension direction (first direction) of the first part of the light folding element intersects with the extension direction (second direction) of the third part, 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 (that is, 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 part to increase the number of light path foldings and / or the optical path inside the light folding element, thereby facilitating the telephoto design of the optical lens. In an embodiment of the present application, the optical lens designs the shape of the light folding element and the light is reflected at least six times in the light folding element, so that the light folding element can have a longer optical path in a smaller volume, thereby facilitating the telephoto design of the optical lens.

[0009] It can be understood that the at least six reflections of the light in the light folding element include one reflection on the deflecting reflection surface and at least five reflections on the remaining surfaces of the light folding element. The reflection of the light on the deflecting reflection surface is mainly to deflect the light path along with the structural bending of the light folding element so as to continue to propagate in the light folding element; the at least five reflections of the light on the remaining surfaces of the light folding element are mainly used to realize the folding of the light path so as to increase the optical path.

[0010] In a possible implementation, a first angle α is formed between the first direction and the second direction, and the first angle α satisfies: 50°≤α≤150°. In this implementation, 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 the interference between the incident light path and the outgoing light path in the light folding element can be reduced. In addition, when the lens group, the light folding element, and the image sensor are compactly arranged, the mechanism interference between the lens and the image sensor module can be avoided, thereby ensuring the reliability of the mechanism.

[0011] In a possible implementation, a first angle α is formed between the first direction and the second direction, and the first angle α satisfies: 70°≤α≤135°. In this implementation, 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 the interference between the incident light path and the outgoing light path in the light folding element can be reduced. In addition, when the lens group, the light folding element, and the image sensor are compactly arranged, the mechanism interference between the lens group and the image sensor module can be avoided, thereby ensuring the reliability of the mechanism.

[0012] In a possible implementation, the light emitted from the lens group enters the incident surface of the light folding element along the optical axis of the lens group, and the incident optical axis of the light emitted to the incident surface coincides with the optical axis of the lens group. The optical axis of the lens group and the incident surface may intersect at a first position. In the implementation of the present application, the center point of the incident surface may be set at the first position.

[0013] The light emitted from the exit surface has an exit optical axis, and the exit optical axis may coincide with the vertical center line of the photosensitive surface of the image sensor. The exit optical axis may be parallel to the optical axis of the lens group. The exit optical axis intersects the exit surface at a third position. In the embodiment of the present application, the center point of the exit surface may be set at the third position.

[0014] The extension line of the first position on the incident surface along the first direction is compared with the deflection reflection surface and the second position. 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: 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: 17.5mm≤S1+S2≤42.5mm.

[0015] In this embodiment, by controlling the first spacing S1 and the second spacing S2, the optical lens can be placed within a telephoto range, and telephoto photography can be performed. The lens has a larger aperture and higher image quality.

[0016] Exemplarily, the first position P1 and the third position P3 form a third interval S3 in the first direction.

[0017] In some examples, the first spacing S1 between the first position P1 and the second position P2, the second spacing S2 between the second position P2 and the third position P3, and the 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%. For example, the value of S1 / (S1+S2) can be 67%, 75%, 80%, 85%, etc.

[0018] In other examples, the first spacing S1 between the first position P1 and the second position P2, the second spacing S2 between the second position P2 and the third position P3, and the third spacing S3 between the first position P1 and the third position P3 in the first direction satisfy: 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.

[0019] 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, the mechanical interference between the lens group and the image sensor module can be avoided, thereby ensuring the reliability of the mechanism.

[0020] In a 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, the first reflection occurs on the first reflection surface, at least three reflections occur on the top surface and the bottom surface, and the last reflection occurs on the second reflection surface.

[0021] In this embodiment, the lens group and the image sensor are located on the same side of the light folding element, and the lens group and the image sensor can reuse the space in the height direction, which is conducive to the miniaturization of the camera module. It can be understood that after the light is converged by the lens group, it enters the light folding element from the incident surface of the light folding element, and after six reflections in the light folding element, it is emitted from the exit surface of the light folding element and then imaged on the image sensor. The optical lens reflects the converged light of the lens group multiple times through the light folding element to fold the light path, thereby shortening the physical space between the lens group and the image sensor, reducing the module size of the optical lens and achieving miniaturization.

[0022] In a possible implementation manner, 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°.

[0023] In this embodiment, the optical lens can control the optical path direction of the light entering the light folding element by limiting the range of the second angle, so that the light can be folded and reflected at least five times in the light folding element, thereby effectively increasing the optical path, achieving a telephoto and miniaturized design, and reducing stray light in the optical lens, thereby improving the imaging quality of the optical lens. If the second angle is too large, the height of the light folding element is large, which is not conducive to reducing the height of the optical lens. If the second angle is too small, it is difficult for the light to meet the requirement of total reflection in the light folding element, which is not conducive to light transmission and imaging.

[0024] In a possible implementation manner, the field of view FOV of the optical lens satisfies: FOV≤30°, or FOV≤20°.

[0025] In this embodiment, by designing the value of the field of view angle 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 miniaturized design.

[0026] In a possible implementation manner, the system focal length EFL of the optical lens satisfies: 20 mm ≤ EFL ≤ 60 mm, or 30 mm ≤ EFL ≤ 50 mm.

[0027] In this embodiment, the optical lens adopts the architecture of lens group + light folding element, and the system focal length EFL of the optical lens is limited, so that 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 the light in the light folding element, and the length dimension of the light folding element can be further compressed by one deflection reflection, so that the optical lens can take into account both the needs of telephoto shooting and the needs of module miniaturization.

[0028] In the implementation mode 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.

[0029] In a possible implementation manner, 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.

[0030] 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, so that the optical lens has a longer focal length to achieve a good long-range shooting effect, and the miniaturization design of the optical lens can be realized.

[0031] 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.

[0032] In this embodiment, by limiting the ratio PL / EFL of the total optical path length of the light folding element to the focal length of the system to be in the range of 0.5 to 1.5, the light folding element can realize multiple folding of the optical path, so that the optical lens has a longer optical path and a shorter physical length, which is conducive to miniaturization design. Among them, PL / EFL can design the total optical path length of the light folding element suitable for the focal length of the system according to 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 folding the optical path by the light folding element to reduce the size of the module. 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 to ensure the space required for arranging the lens to ensure optical performance, and thus the desired optical performance cannot be obtained.

[0033] In a 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.

[0034] 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 suitable, thereby avoiding the module size of the optical lens being too large, and also enabling the optical lens to have better optical performance and better imaging quality.

[0035] In a second aspect, an embodiment of the present application provides a camera module, which includes an image sensor and any one of the above optical lenses, wherein the image sensor is located on the image side of the optical lens.

[0036] In this embodiment, the surface of the image sensor includes hundreds of thousands to millions of photodiodes, which generate electric charge when exposed to light. The image sensor uses the photoelectric conversion function of the photoelectric device to convert the light image on its photosensitive surface into an electrical signal in a corresponding proportional relationship with the light image. The photosensitive surface of the image sensor is arranged facing the optical lens.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] In a third aspect, an embodiment of the present application provides an electronic device, which includes an image processor and any of the above-mentioned camera modules, wherein the image processor is communicatively connected to the camera module, and the image processor is used to obtain image data from the camera module and process the image data.

[0042] In this embodiment, the optical lens of the electronic device meets the design requirements of telephoto and miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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.

[0044] Figure 1 is a schematic diagram of the structure of an electronic device provided in some embodiments of the present application;

[0045] Figure 2 yes Figure 1 A schematic diagram of a cross-sectional structure of the electronic device shown is taken along AA;

[0046] Figure 3 yes Figure 2 The structure diagram of the camera module shown in some embodiments;

[0047] Figure 4 yes Figure 3 A schematic structural diagram of the light folding element shown;

[0048] Figure 5A yes Figure 4 A top view of the light folding element shown in some embodiments;

[0049] Figure 5B yes Figure 4 A top view of the light folding element in some other embodiments;

[0050] Figure 5C yes Figure 4 A top view of the light folding element in some other embodiments;

[0051] Figure 6 yes Figure 4 A schematic diagram of an equivalent unfolded optical path of the light folding element shown;

[0052] Fig. 7A yes Figure 1 The schematic diagram of the structure of the camera module in other embodiments is shown;

[0053] Figure 7B yes Fig. 7A A schematic diagram of an equivalent unfolded optical path of the optical folding element of the camera module shown;

[0054] Fig. 8A yes Figure 3 A schematic diagram of an equivalent expanded optical path of the camera module in the first embodiment is shown;

[0055] Figure 8B yes Fig. 8A A simulation effect diagram of the camera module shown in a possible embodiment;

[0056] Fig. 9A yes Figure 3 A schematic diagram of an equivalent expanded optical path of the camera module in the second embodiment is shown;

[0057] Fig. 9B yes Fig. 9AA simulation effect diagram of the camera module shown in a possible embodiment;

[0058] Fig. 10A yes Figure 3 A schematic diagram of an equivalent expanded optical path of the camera module in the third embodiment;

[0059] Fig. 10B yes Fig. 10A A simulation effect diagram of a camera module in a possible embodiment is shown. DETAILED DESCRIPTION

[0060] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0061] 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.

[0062] A lens or lens group with positive optical power has a positive focal length and has the effect of converging light.

[0063] A lens or lens group with negative optical power has a negative focal length and has the effect of diverging light.

[0064] 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 infinitely distant scene forms a clear image on the focal plane through a lens or lens group. From a practical point of view, it can be understood as the distance from the center of the lens to the plane when the object is infinitely far away. For a fixed-focus lens, the position of its optical center is fixed; for a telephoto lens, the change of the optical center of the lens brings about a change in the focal length of the lens.

[0065] The object side is bounded 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.

[0066] The image side is bounded by the lens. 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.

[0067] 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.

[0068] Aperture value, also known as F number (Fno), is the relative value obtained by dividing the focal length of the lens by the diameter of the lens entrance pupil (the inverse of the relative aperture). The smaller the aperture value, the more light enters in the same unit time. The larger the aperture value, the smaller the depth of field, and the background content of the photo will be blurred, similar to the effect of a telephoto lens.

[0069] Total track length (TTL) refers to the total length from the surface of the lens closest to the object side to the imaging surface.

[0070] 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.

[0071] The optical axis is an axis that passes vertically through the center of the lens. The optical axis of the lens is the axis that passes through the center of each lens of the lens. When light parallel to the optical axis enters a convex lens, the ideal convex lens should have all the light converge at one point behind the lens. This point where all the light converges is the focus.

[0072] Focus is the point where parallel light rays converge after being refracted by a lens or lens group.

[0073] 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.

[0074] 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.

[0075] The Abbe number, or 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.

[0076] In optical instruments, the angle of view (FOV) is the angle formed by the two edges of the maximum range of the image of the object to be measured that can pass through the lens, with the lens of the optical instrument as the vertex. The size of the field of view angle determines the field of view of the optical instrument. The larger the field of view angle, the larger the field of view and the smaller the optical magnification.

[0077] 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.

[0078] Aberration, the paraxial region of the 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 that actually passes through different apertures of the lens is difficult to intersect perfectly at one point, but has a certain deviation from the position of the paraxial image point. These differences are collectively called aberrations.

[0079] Axial chromatic aberration (longitudinal spherical aberration), also known as longitudinal chromatic aberration or position chromatic aberration or axial aberration, is a beam of light parallel to the optical axis that converges at different positions before and after passing through the lens. This aberration is called position chromatic aberration or axial chromatic aberration. This is because the positions of the images of light of different wavelengths formed by the lens are different, so that the image-side focal planes of light of different colors cannot overlap when the final image is formed, and the complex light spreads out to form dispersion.

[0080] Distortion, also known as distortion, is the degree of distortion of the image formed by the optical system relative to the object itself. Distortion is due to the influence of aperture spherical aberration. The height of the intersection of the main light of different fields of view with 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 imaging position of the off-axis object point on the ideal plane, causing the shape of the image to be distorted, but does not affect the clarity of the image.

[0081] Astigmatism, because the object point is not on the optical axis of the optical system, the light beam it emits has an inclination angle with the optical axis. After the light beam is refracted by the lens, the convergence point of its meridional beamlet and sagittal beamlet is not at the same point. That is, the light beam cannot be focused on one point, and the image is not clear, so astigmatism occurs. Meridian beamlet and sagittal beamlet are the names of light beams in two perpendicular planes in a rotationally symmetric optical system.

[0082] Meridian plane: The plane formed by the chief ray (chief light beam) of an object point outside the optical axis and the optical axis is called the meridian plane.

[0083] Sagittal plane: The plane that passes through the main ray (main light beam) of the object point outside the optical axis and is perpendicular to the meridian plane is called the sagittal plane.

[0084] Field curvature is used to indicate the difference between the clearest image point position of the non-central field of view light after passing through the optical lens group and the clearest image point position of the central field of view on the optical axis. When the lens has field curvature, the intersection point of the entire light beam does not coincide with the ideal image point. Although a clear image point can be obtained at each specific point, the entire image plane is a curved surface.

[0085] The technical solution in the embodiment of the present application will be described below in conjunction with the accompanying drawings. In the description of the embodiment of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiment of the present application, "multiple" means two or more than two.

[0086] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0087] In addition, in the embodiments of the present application, the limitations of the relative position relationship mentioned, such as parallel, vertical, etc. These limitations 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 vertical, 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.

[0088] 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 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 surface is located in the first part, the deflection reflection surface is located in the second part and parallel to the optical axis of the lens group, and the exit surface is located in the third part; the light enters the light folding element from the incident surface, and after at least six reflections occur in the light folding element, it is emitted from the light folding element from the exit surface; the at least six reflections include one reflection occurring on the deflection reflection surface. The optical lens of the embodiment of the present application is structurally bent through the light folding element to better take into account the requirements of telephoto shooting and module miniaturization.

[0089] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the structure of an electronic device provided in some embodiments of the present application, Figure 2 yes Figure 1The cross-sectional structure diagram of the electronic device shown is taken along AA.

[0090] 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.

[0091] Exemplarily, 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 plate 101 and a frame 102. The rear cover plate 101 may be an integrally formed structural member with the frame 102, or may be assembled to form an integral structure. The display screen 110 and the rear cover plate 101 are respectively mounted on both sides of the frame 102, and together enclose an inner cavity of the whole machine for mounting the camera module 200, the image processor 300 or other structural members.

[0092] The electronic device 1000 may have a width direction X', a length direction Y' and a thickness direction Z', 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 rear cover plate 101 may be arranged relatively in the thickness direction Z' of the electronic device 1000. At this time, the rear cover plate 101 may be perpendicular to the thickness direction Z' of the electronic device 1000.

[0093] Exemplarily, the camera module 200 is installed in the housing 100, and the light-entering 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 light-transmitting lens 1012, which is installed in the opening 1011 of the rear cover 101 to allow light to pass through, and can be dustproof and waterproof. In some other embodiments, the light-entering side of the camera module 200 can be facing the side where the display screen 110 is located, 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.

[0094] Understandably, Figure 1The installation position of the camera module 200 of the electronic device 1000 in the illustrated embodiment is merely illustrative, and the present application does not strictly limit the installation position of the camera module 200. In some other embodiments, the camera module 200 may also be installed at other positions of the electronic device 1000, for example, the camera module 200 may be installed at the upper middle or 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 disassembled relative to the terminal body, and the camera module 200 may also be arranged on the auxiliary component.

[0095] Exemplarily, the display screen is fixed to the housing 100, and the display screen is used to display images to meet the user's usage needs. The display screen may include a display layer and a touch layer covering the display layer, the touch layer can be used for touch operation by the user, and the touch layer may be a transparent glass cover, plastic or other materials with good light transmittance. The display layer may be a liquid crystal display screen, or an organic light emitting diode display screen, etc. The display layer may include a display area and a non-display area, the non-display area is located on one side of the display area, or is surrounded by the periphery of the display area, wherein, in some electronic devices, the non-display area may not be provided.

[0096] Exemplarily, the image processor 300 is communicatively connected with 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. The communication connection between the camera module 200 and the image processor 300 may include data transmission through electrical connection methods such as wiring, or data transmission may be achieved through coupling and the like. It is understandable that the camera module 200 and the image processor 300 may also be communicatively connected through other methods capable of achieving data transmission.

[0097] The image processor 300 may include a plurality of processing modules, which may be operated to convert the original 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 through the display screen. The image processor 300 may be an image processing chip or a digital signal processing chip, which is used to adjust the color of the image, perform noise reduction processing on the image, etc., to further improve the image quality.

[0098] 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, and 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.

[0099] 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.

[0100] In some embodiments, the image processor 300 further compresses the processed image digital signal and stores it in the memory to save memory space.

[0101] It is understandable that the number of camera modules 200 may be one or at least two. When the number of camera modules 200 is one, the camera module 200 may be used for 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 may be cameras that can meet different shooting requirements, such as a telephoto camera module and a wide-angle camera module, respectively, and this application does not limit this.

[0102] 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, transmit the processed information to the display module of the display screen 110, and 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 searched from the memory at any time and displayed on the display screen 110 when the image needs to be viewed later.

[0103] Figure 1 It is only a schematic diagram showing the structure of an electronic device 1000. Figure 1 The size, quantity and position of the camera module 200, image processor 300, analog-to-digital converter 400 and memory shown are only schematic representations and can be adjusted as needed, and this application does not limit this.

[0104] Please refer to Figure 2 and Figure 3 , Figure 3 yes Figure 2 The camera module 200 is shown as a schematic diagram of the structure in some embodiments.

[0105] 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 photographed scene is refracted by the optical lens 10, passes through the filter 30, and is incident on the image sensor 20 to form an image.

[0106] The image sensor 20 may be located on the image side of the optical lens 10. The image sensor 20 is a semiconductor chip, which may also be called a photosensitive chip. The surface of the image sensor 20 contains hundreds of thousands to millions of photodiodes, which generate electric charge when exposed to light. The image sensor 20 utilizes the photoelectric conversion function of the photoelectric device to convert the light image on its photosensitive surface into an electrical signal in a corresponding proportional relationship with the light image. The photosensitive surface of the image sensor 20 is arranged facing the optical lens 10. The image sensor 20 may be a charge coupled device, a complementary metal oxide semiconductor, a phototransistor, or a thin film transistor, etc.

[0107] Exemplarily, the camera module 200 may further include a driver (not shown), which is used to drive the lens 21 and / or the image sensor 20 to move, so as 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.

[0108] Exemplarily, the filter 30 may 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 is filtered by the filter 30 to form an image on the image sensor 20. Exemplarily, the filter 30 may be an infrared filter. The filter 30 may eliminate unnecessary light of a wavelength band projected onto the image sensor 20, prevent the image sensor 20 from generating false colors or ripples, and thereby improve its effective resolution and color reproduction.

[0109] In some embodiments, the filter structure may be eliminated, and filtering may be achieved by performing surface treatment or material treatment on at least one optical element of the optical lens 10. The present application does not strictly limit the specific embodiments of the structure or structure used to achieve filtering.

[0110] Exemplarily, 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. Among them, 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.

[0111] 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.

[0112] The following Figure 3 The implementation scheme of the optical lens 10 shown is illustrated by way of example.

[0113] Please refer to Figure 3 and Figure 4 , Figure 4 yes Figure 3 A schematic structural diagram of the light folding element 2 is shown.

[0114] In some embodiments, 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 .

[0115] Exemplarily, the lens group 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 group 1. The lens group 1 includes at least one lens with positive optical power. In some examples, the lens group 1 may include multiple lenses, such as 2 to 4 lenses, and the multiple lenses may be arranged along the optical axis O of the lens group 1, and the optical power of at least one lens of the multiple lenses is positive.

[0116] Exemplarily, the light folding element 2 is used to fold the optical path to shorten the physical space size between the lens group 1 and the image sensor 20. In some examples, the light folding element 2 may be a prism. The light folding element 2 may be roughly in a strip-shaped structure. Exemplarily, 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 close to the object side, and the exit surface 22 may be located at the image side end of the light folding element 2 close to the image side, and the light enters the light folding element 2 from the incident surface 21, propagates from the object side end to the image side end in the light folding element 2, and undergoes multiple reflections during propagation, and then is emitted from the light folding element 2 from the exit surface 22. The object side end of the light folding element 2 is arranged corresponding to the lens group 1, and the incident surface 21 is arranged facing the lens group 1 to receive the light emitted by the lens group 1; the image sensor 20 is arranged corresponding to the image side end of the light folding element 2, and the image sensor 20 is arranged facing the exit surface 22, so that the light emitted by the light folding element 2 can be imaged on the image sensor 20.

[0117] In the embodiment of the present application, after the light is converged by the lens group 1, it enters the light folding element 2 through the incident surface 21 of the light folding element 2, and after multiple reflections in the light folding element 2, it is emitted from the exit surface 22 of the light folding element 2, and then imaged on the image sensor 20. The optical lens 10 reflects the converged light of the lens group 1 multiple times through the light folding element 2 to fold the light path, thereby shortening the physical space between the lens group 1 and the image sensor 20, thereby reducing the module size of the optical lens 10 and achieving miniaturization.

[0118] It can be understood that the light emitted by the lens group 1 enters the incident surface 21 of the light folding element 2 along the optical axis O of the lens group 1, and the incident optical axis of the light emitted to the incident surface 21 coincides with the optical axis O of the lens group 1. The optical axis O of the lens group 1 and the incident surface may intersect at the first position P1. In the embodiment of the present application, the center point of the incident surface 21 may be set at the first position P1.

[0119] The light emitted from the exit surface 22 has an exit optical axis O', and the exit optical axis O' can coincide with the vertical center line 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 group 1. The exit optical axis O' intersects the exit surface 22 at the third position P3. In the embodiment of the present application, the center point of the exit surface 22 can be set at the third position P3.

[0120] In some embodiments, the optical folding element 2 may include a first portion 2a, a second portion 2b, and a third portion 2c connected in sequence from the object side to the image side. At this time, the light entering the optical folding element 2 passes through the first portion 2a, the second portion 2b, and the third portion 2c in sequence and then exits. Among them, the first portion 2a can extend along the first direction, and the third portion 2c can extend along the second direction. The plane where the first direction and the second direction are located is perpendicular to the optical axis O of the lens group 1, and the second direction intersects with the first direction. Among them, the plane where the first direction and the second direction are located is the plane where the first direction and the second direction are coplanar. The plane where the first direction and the second direction are located is perpendicular to the optical axis O of the lens group 1, that is, perpendicular to the height direction Z of the optical lens 10, and 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).

[0121] Exemplarily, the incident surface 21 of the light folding element 2 is located in the first part 2a, and the exit surface 22 is located in the third part 2c. The light folding element 2 also includes a deflection reflection surface 23, which is located in the second part 2b and parallel to the optical axis O of the lens group 1. After passing through the lens group 1, the external light enters the light folding element 2 from the incident surface 21, and after at least six reflections in the light folding element 2, it is emitted from the light folding element 2 from the exit surface 22; wherein, the at least six reflections include one reflection on the deflection reflection surface 23.

[0122] In this embodiment, the optical lens 10 is provided with a light folding element 2 which is roughly arranged on a plane (i.e., an XY plane) perpendicular to the height direction Z of the optical lens 10. 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.

[0123] Exemplarily, the height H of the optical folding element 2 is its dimension in the height direction Z of the optical lens 10, the length L of the optical folding element 2 is its dimension in the length direction Y of the optical lens 10, and the width of the optical folding element 2 is its dimension in the width direction X of the optical lens 10. The thickness of the optical folding element 2 may be less than the length of the optical 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.

[0124] In some examples, the first direction is parallel to the length direction Y of the optical lens 10, and in this case, the size of the optical folding element 2 in the first direction is the length L of the optical folding element 2. In the embodiment of the present application, since the extension direction of the optical folding element 2 is deflected at 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 is structurally bent, the size of the optical folding element 2 in the first direction is reduced, and the length L of the optical folding element 2 in the length direction Y of the optical lens 10 is reduced, so that the module length of the optical lens 10 and the camera module 200 can be effectively reduced, which is conducive to miniaturization design.

[0125] In addition, since the extension direction (first direction) of the first portion 2a of the light folding element 2 intersects with the extension direction (second direction) of the third portion 2c, the light folding element 2 is structurally bent. Therefore, when the length dimension of the light folding element 2 in the length direction Y of the optical lens 10 is limited, the extension length of the light folding element 2 (that is, 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 to increase the number of light path foldings and / or the optical path length inside 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 is designed in the shape of the light folding element 2, and the light is reflected at least six times in the light folding element 2, so that the light folding element 2 can have a longer optical path length in a smaller volume, thereby facilitating the telephoto design of the optical lens 10.

[0126] 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 to deflect the light path along with the structural bending of the light folding element 2 so as to continue to propagate in 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 realize the folding of the light path so as to increase the optical path.

[0127] Please refer to FIG. 5A to FIG. 5C , Figure 5A yes Figure 4 A top view of the light folding element 2 in some embodiments is shown, Figure 5B yes Figure 4 The top view of the light folding element 2 in other embodiments is shown, Figure 5C yes Figure 4 The light folding element 2 is shown in a top view in some other embodiments.

[0128] In some embodiments, a first angle α is formed between the first direction and the second direction, and the first angle α satisfies: 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: 70°≤α≤135°. In some examples, 70°≤α≤90°.

[0129] 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 to ensure mechanical reliability.

[0130] Among them, Figure 5A As shown, when the first angle α is 90°, the second direction is perpendicular to the first direction, and the third part 2c is bent perpendicularly relative to the first part 2a. At this time, 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.

[0131] like Figure 5B As shown, 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.

[0132] like Figure 5CAs shown, when the first angle α is greater than 90°, the third part 2c slightly deviates 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.

[0133] 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.

[0134] In addition, in the embodiment of the present application, the optical folding element 2 is roughly an "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 is 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 is bonded to the second part 2b; or, a part of the second part 2b is integrally formed with the first part 2a, and the other part is integrally formed with the third part 2c, and the two integrally formed structural members are bonded; or, the first part 2a, the second part 2b and the third part 2c are 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.

[0135] In some embodiments, FIG. 5A to FIG. 5C As shown, the extension line of the first position P1 on the incident surface 21 along the first direction and the deflection reflection surface 23 are compared with the second position P2. The first position P1 and the second position P2 form a first spacing S1, and the second position P2 and the third position P3 on the exit surface 22 form a second spacing S2. The first spacing S1 and the second spacing S2 satisfy: 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: 17.5mm≤S1+S2≤42.5mm.

[0136] In this embodiment, by controlling the first spacing S1 and the second spacing S2, the optical lens 10 can be placed in a telephoto range, can perform telephoto photography, and has a larger aperture and higher image quality.

[0137] Exemplarily, the first position P1 and the third position P3 form a third interval S3 in the first direction.

[0138] In some examples, such as Figure 5A and Figure 5B As shown, the first spacing S1 between the first position P1 and the second position P2, the second spacing S2 between the second position P2 and the third position P3, and the 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%. For example, the value of S1 / (S1+S2) can be 67%, 75%, 80%, 85%, etc.

[0139] In other examples, such as Figure 5C As shown, the first spacing S1 between the first position P1 and the second position P2, the second spacing S2 between the second position P2 and the third position P3, and the third spacing S3 between the first position P1 and the third position P3 in the first direction satisfy: 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.

[0140] 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, it is possible to reduce the length of the optical folding element 2 in the first direction, which is beneficial to the miniaturized design of the optical lens 10 and the camera module 200, and at the same time avoid mechanical interference between the lens group 1 and the image sensor 20 module, thereby ensuring mechanical reliability.

[0141] Please refer to Figure 3 , Figure 4 and Figure 6 , Figure 6 yes Figure 4 The schematic diagram of the equivalent unfolded optical path of the light folding element 2 is shown. 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.

[0142] In some embodiments, the optical folding element 2 may include a top surface 24 and a bottom surface 25 arranged in parallel, and the arrangement direction of the top surface 24 and the bottom surface 25 is parallel to the optical axis O of the lens group 1. In this case, the top surface 24 and the bottom surface 25 of the optical 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 optical folding element 2. Exemplarily, 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 group 1 and the image sensor 20 are located on the same side of the optical folding element 2, and the lens group 1 and the image sensor 20 can reuse the space in the height direction, which is conducive to the miniaturization of the camera module 200.

[0143] The deflection reflection surface 23 connects the top surface 24 and the bottom surface 25. The deflection reflection surface 23 is perpendicular to the top surface 24. The light folding element 2 also includes a first reflection surface 26 and a second reflection surface 27. The first reflection surface 26 is located in the first part 2a and connects the top surface 24 and the bottom surface 25. The second reflection surface 27 is located in the third part 2c and connects the top surface 24 and the bottom surface 25. After the light enters the light folding element 2, it is reflected for the first time on the first reflection surface 26, reflected at least three times on the top surface 24 and the bottom surface 25, reflected once on the deflection reflection surface 23, and reflected for the last time on the second reflection surface 27. At this time, the light is reflected at least six times in the light folding element 2.

[0144] The reflection on the deflecting reflection surface 23 may occur between one reflection on the top surface 24 and one reflection on the bottom surface 25. For example, the at least six reflections of the light in the light folding element 2 may also include: a second reflection on the top surface 24, a third reflection on the bottom surface 25, a fourth reflection on the deflecting reflection surface 23, and a fifth reflection on the top surface 24; or, a second reflection on the top surface 24, a third reflection on the deflecting reflection surface 23, a fourth reflection on the bottom surface 25, a fifth reflection on the top surface 24, etc. At this time, the deflecting reflection surface 23 is roughly set in the middle area of ​​the optical path of the light folding element 2, so that the length dimension of the light folding element 2 can be effectively reduced.

[0145] in, Figure 6 In the subsequent drawings of the present application, in the schematic diagram of the equivalent unfolded optical 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.

[0146] 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 part 2a, and the first side surface 28 and the second side surface 29 are arranged opposite to each other and are both connected to the top surface 24, the bottom surface 25 and the first reflecting surface 26. The top surface 24 is located in the area of ​​the first part 2a, the bottom surface 25 is located in the area of ​​the first part 2a, and the first side surface 28 and the second side surface 29 are parallel to the extension direction of the first part 2a, that is, parallel to the first direction. In some examples, the first side surface 28 and the second side surface 29 may be arranged in parallel. At this time, the shape of the cross section of the first part 2a perpendicular to the first direction is a rectangle. In some other examples, an angle may be formed between the first side surface 28 and the second side surface 29, and at this time, the shape of the cross section of the first part 2a perpendicular to the first direction may be a trapezoid. In some examples, the second side surface 29 may also be connected to the deflecting reflecting surface 23.

[0147] In some embodiments, the optical 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 part 2c, and the third side surface 210 and the fourth side surface 220 are arranged opposite to each other and are connected to the top surface 24, the bottom surface 25 and the second reflective surface 27. The top surface 24 is located in the area of ​​the third part 2c, the bottom surface 25 is located in the area of ​​the third part 2c, and the third side surface 210 and the fourth side surface 220 are parallel to the extension direction of the third part 2c, that is, parallel to the second direction. In some examples, the third side surface 210 and the fourth side surface 220 may be arranged in parallel. At this time, the shape of the cross section of the third part 2c perpendicular to the second direction is a rectangle. In some other examples, an angle may be formed between the third side surface 210 and the fourth side surface 220, and at this time, the shape of the cross section of the third part 2c perpendicular to the second direction may be a trapezoid. In some examples, the fourth side surface 220 may also be connected to the deflection reflective surface 23.

[0148] In some embodiments, the second portion 2b may be in the shape of a triangular prism. In some 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 embodiments of the present application.

[0149] In the following text, for the convenience of description, the reflection of the light on the deflection reflection surface 23 of the light folding element 2 is referred to as deflection reflection, and the reflection of the light on other surfaces of the light folding element 2 (such as the first reflection surface 26, the second reflection surface 27, the top surface 24, and the bottom surface 25) is referred to as folding reflection. Then, the light undergoes one deflection reflection in the light folding element 2 and at least five folding reflections.

[0150] In some embodiments, a second angle β is formed between the first reflective surface 26 and the incident surface 21, and the second angle β satisfies: 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: 25°≤β≤37°.

[0151] In this embodiment, the optical lens 10 can control the optical path direction of the light incident into the light folding element 2 by limiting the range of the second angle β, so that the light can be folded and reflected at least five times in the light folding element 2, thereby effectively increasing the optical path, achieving a telephoto and miniaturized design, and reducing stray light in the optical lens 10, thereby improving the imaging quality of the optical lens 10. If the second angle β is too large, the value of the height H of the light folding element 2 is large, which is not conducive to reducing the height of the optical lens 10. If the second angle β is too small, it is difficult for the light to meet the requirement of total reflection in the light folding element 2, which is not conducive to light transmission and imaging.

[0152] In some embodiments, the angle between the second reflection surface 27 and the emission surface 22 may be equal to the second angle β.

[0153] In some embodiments, the field of view FOV of the optical lens 10 may satisfy: FOV≤30°. For example, the value of 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°.

[0154] In this embodiment, by designing the value of the field of view angle 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 miniaturized design.

[0155] In some embodiments, the system focal length EFL of the optical lens 10 may satisfy: 20mm≤EFL≤60mm. For example, the value of the system focal length EFL may be 28mm, 32mm, 33mm, 35mm, 41mm, 43mm, etc. In some examples, the system focal length EFL may satisfy: 30mm≤EFL≤50mm.

[0156] In this embodiment, the optical lens 10 adopts the architecture of lens group 1 + light folding element 2, and 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 the 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.

[0157] In the embodiment 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 size design of the image sensor 20, and the design of the number of folding reflections of the light folding element 2 are interrelated and affect each other. Through the combined design of the relevant parameters, the optical system can have a better field of view and sensor range, so as to better achieve telephoto and miniaturization, and also have better imaging quality. Among them, the half sensor diagonal Y of the image sensor 20 corresponds to the image height, and the image height = EFL × tan (FOV / 2).

[0158] 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.

[0159] 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, so that the optical lens 10 has a longer focal length to achieve a good long-range shooting effect, and the miniaturization design of the optical lens 10 can be realized.

[0160] In some embodiments, 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. For example, the value of PL / EFL may be 0.8, 0.9, 1.0, 1.1, 1.2, etc. In some examples, the value of PL / EFL may satisfy: 0.7≤PL / EFL≤1.3.

[0161] 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 within the range of 0.5 to 1.5, the light folding element 2 can realize multiple folding of the optical path, so that the optical lens 10 has a longer optical path and a shorter physical length, which is conducive to miniaturization design. Among them, PL / EFL can be used to design the total optical path length PL of the light folding element 2 suitable for the system focal length EFL according to the desired field of view FOV of the optical lens 10. If PL / EFL is lower 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 the size of the module. 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 to ensure the space required for arranging lenses to ensure optical performance, thereby failing to obtain the desired optical performance.

[0162] In some embodiments, the lens group 1 includes a first lens L1 closest to the object side, and the focal length F1 of the first lens L1 and the system focal length EFL of the optical lens 10 may satisfy: 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: 0.25≤F1 / EFL≤0.5.

[0163] 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 suitable, thereby avoiding the module size of the optical lens 10 being too large, and also making the optical lens 10 have better optical performance and better imaging quality.

[0164] 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.

[0165] 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.

[0166] 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.

[0167] In some embodiments, when the object side surfaces and / or image side surfaces of some lenses in the lens group 1 are aspherical surfaces, the object side surfaces and / or image side surfaces of some lenses may be defined by, but not limited to, the following aspherical surface formula:

[0168]

[0169] Where z is the relative distance between a point on the aspherical surface that is r away from the optical axis O and the tangent plane that is tangent to the optical axis O of the aspherical surface; r is the vertical distance between the point on the aspherical curve and the optical axis O; c is the curvature; k is the cone coefficient; α i is the i-th order aspheric coefficient.

[0170] In the above embodiments, the folding reflection of the light in the light folding element 2 may be an odd number of times, such as Figure 6 Five times in the embodiment shown, or seven times, nine times, etc. in other embodiments. At this time, the exit surface 22 and the incident surface 21 are located on the same side of the light folding element 2, for example, both are located on the top surface 24.

[0171] Please refer to Fig. 7A and Figure 7B , Fig. 7A yes Figure 1 The structure diagram of the camera module 200 in other embodiments is shown in FIG. Figure 7B yes Fig. 7A Schematic diagram of the equivalent unfolded optical path of the optical folding element 2 of the camera module 200. This embodiment can include most of the technical features of the previous embodiment, and the following mainly describes the difference between the two, and the same parts of the two are not repeated.

[0172] In some embodiments, the folding reflection of light in the light folding element 2 may be an even number, 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 group 1 and the image sensor 20 are also located on opposite sides of the light folding element 2.

[0173] In the foregoing embodiment, the structure of the optical folding element 2 is bent once, and in the top view of the optical folding element 2, the optical path is deflected once. In some other embodiments of the present application, the structure of the optical folding element 2 may be bent more than twice, and in the top view of the optical folding element 2, the optical path may be deflected more than twice. For example, the optical folding element 2 may be a roughly U-shaped strip structure. In some other embodiments, the optical folding element 2 may be other types of structural members in addition to a prism, and the embodiments of the present application do not strictly limit this.

[0174] Please refer again Figure 3In some embodiments, 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 can move in a direction parallel to the optical axis O of the lens group 1. In this embodiment, the camera module 200 can achieve automatic focusing by moving the lens group 1, the lenses in the lens group 1, or the image sensor 20 to obtain better imaging quality and shooting experience.

[0175] 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 to obtain better imaging quality and shooting experience.

[0176] Exemplarily, the lens group 1 and the image sensor 20 are located on the same side of the light folding element 2, and the direction in which the light enters the image sensor 20 is parallel to the optical axis O of the lens group 1. In some other embodiments, the direction in which the light enters the image sensor 20 is also not parallel to the optical axis O of the lens group 1, and the embodiments of the present application do not strictly limit this.

[0177] The following is a combination of figures, data and simulation results. Figure 3 The camera module 200 and the optical lens 10 are shown in some possible embodiments. In order to more clearly illustrate the schematic optical path of the central field of view, the following Fig. 8A , Fig. 9A and Fig. 10A The light folding element 2 in the figure adopts an equivalent unfolded structure to present an equivalent unfolded light path.

[0178] First embodiment

[0179] Please refer to Figure 3 , Figure 4 as well as Fig. 8A , Fig. 8A yes Figure 3 The diagram is a schematic diagram of the equivalent expanded light path of the camera module 200 in the first embodiment.

[0180] 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. The light reflected from the photographed scene is refracted by the optical lens 10, passes through the filter 30, and is incident on the image sensor 20 to form an image.

[0181] Exemplarily, 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 .

[0182] The lens group 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 group 1. The lens group 1 includes a first lens L1, a second lens L2, and a third lens L3 arranged from the object side to the image side. The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, and the third lens L3 has negative refractive power.

[0183] The optical folding element 2 includes a first part 2a, a second part 2b and a third part 2c which are sequentially connected from the object side to the image side. The light entering the optical folding element 2 passes through the first part 2a, the second part 2b and the third part 2c in sequence and then exits. The first part 2a can extend along a first direction, and the third part 2c can extend 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 planes where the first direction and the second direction are located 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, and the optical 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 optical folding element 2 can be a prism.

[0184] The light folding element 2 may include a top surface 24 and a bottom surface 25 arranged in parallel, and the arrangement direction of the top surface 24 and the bottom surface 25 is parallel to the optical axis O of the lens group 1. The light folding element 2 includes an incident surface 21, an exit surface 22 and a deflection reflection surface 23 ( Fig. 8A The incident surface 21 is located in the first part 2a and on the top surface 24; the exit surface 22 is located in the third part 2c and on the top surface 24; the deflection reflection surface 23 is located in the second part 2b and connects the top surface 24 and the bottom surface 25, and the deflection reflection surface 23 is parallel to the optical axis O of the lens group 1 and perpendicular to the top surface 24.

[0185] The light folding element 2 further includes a first reflection surface 26 and a second reflection surface 27. The first reflection surface 26 is located in the first portion 2a and connects the top surface 24 and the bottom surface 25. The second reflection surface 27 is located in the third portion 2c and connects the top surface 24 and the bottom surface 25. After the light enters the light folding element 2, it is reflected for the first time on the first reflection surface 26, reflected three times on the top surface 24 and the bottom surface 25, and reflected once on the deflection reflection surface 23 ( Fig. 8A (not shown), and the last reflection occurs on the second reflecting surface 27. At this time, the light is reflected six times in the light folding element 2, including one deflection reflection and five folding reflections.

[0186] In the embodiment of the present application, after the light is converged by the lens group 1, it enters the light folding element 2 through the incident surface 21 of the light folding element 2, and after six reflections in the light folding element 2, it is emitted from the exit surface 22 of the light folding element 2, and then imaged on the image sensor 20. The optical lens 10 reflects the converged light of the lens group 1 multiple times through the light folding element 2 to fold the light path, thereby shortening the physical space between the lens group 1 and the image sensor 20, thereby reducing the module size of the optical lens 10 and achieving miniaturization.

[0187] Among them, the light 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 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 200, which is conducive to miniaturization.

[0188] 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 miniaturized design.

[0189] 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, thereby facilitating the telephoto design of the optical lens 10.

[0190] Please refer to Table 1a, which is Figure 3 , Fig. 8A The curvature radius, thickness, refractive index (Nd), Abbe number (Vd), and effective radius of each lens, light folding element 2, and filter 30 of the camera module 200 in a possible embodiment are shown. The thickness includes the thickness of the structure itself and the spacing between the structures, and INF refers to infinity. STO is the aperture.

[0191] Table 1a

[0192]

[0193] Please refer to Table 1b, which is Figure 3 , Fig. 8A The aspheric coefficients of each lens of the camera module 200 in a possible embodiment are shown.

[0194] Table 1b

[0195] No. K A4 A6 A8 A10 A12 2 0.00E+00 -4.11E-05 -1.22E-06 7.58E-08 -3.76E-09 3.58E-11 3 0.00E+00 -4.79E-05 2.42E-06 -3.67E-07 1.34E-08 -1.41E-10 4 0.00E+00 7.90E-04 -3.37E-05 1.28E-06 -5.86E-08 1.16E-09 5 0.00E+00 5.41E-04 2.21E-05 -2.62E-06 5.73E-08 -7.63E-11 6 0.00E+00 1.21E-03 -4.15E-05 -4.03E-07 5.41E-08 -8.48E-10 7 0.00E+00 2.12E-03 -9.23E-05 3.51E-06 -1.04E-08 -1.09E-09

[0196] Among them, K is the quadratic surface constant, and symbols such as A4, A6, A8, A10, and A12 represent aspheric coefficients.

[0197] 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:

[0198]

[0199] Where z is the relative distance between a point on the aspherical surface that is r away from the optical axis O and the tangent plane that is tangent to the optical axis O of the aspherical surface; r is the vertical distance between the point on the aspherical curve and the optical axis O; c is the curvature; k is the cone coefficient; α i is the i-th order aspheric coefficient.

[0200] Please refer to Table 1c, which is Figure 3 , Fig. 8A Parameters of the camera module 200 in a possible embodiment are shown. 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 optical 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 reflection 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 exit optical axis O' in the equivalent optical path.

[0201] Table 1c

[0202]

[0203]

[0204] See also Figure 8B , Figure 8B yes Fig. 8A The illustrated diagram is a simulation effect diagram of the camera module 200 in a possible embodiment.

[0205] in, Figure 8BIt includes axial chromatic aberration curve, astigmatism field curvature curve and distortion curve. Among them, the axial chromatic aberration curve indicates the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system. The reference wavelength of the axial chromatic aberration curve is 486.1nm, 587.6nm and 656.3nm. 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. Figure 8B The median values ​​are all small, and the axial aberrations (spherical aberration, chromatic aberration, etc.) of the optical lens 10 are well corrected. The astigmatism field curvature curve represents the meridional image curvature and the sagittal image curvature, and is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface, wherein the solid line is the meridional direction light beam, the dotted line is the sagittal direction light 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-level aberrations. 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 between the convergence point of the light beam in different fields of view (actual image height) and the ideal image height. The reference wavelength of the distortion curve can be 486.1nm, 587.6nm, and 656.3nm. Figure 8B The values ​​shown are all within 1%, ensuring that there is no obvious distortion in the image. Figure 8B It can be seen that the camera module 200 provided in this embodiment can achieve good imaging quality. Figure 8B Since the distortion curve is very close to the ordinate, there is an overlap with the ordinate in the figure.

[0206] The camera module 200 provided in this embodiment has a field of view FOV of 12.4° for the optical lens 10 when the object distance is infinite, a system focal length EFL of 33 mm, a total optical length TTL of the optical lens 10 of 36.266 mm, a total optical path length PL of the optical folding element 2 of 29.63 mm, and 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.

[0207] Second embodiment

[0208] Please refer to Figure 3 , Figure 4 as well as Fig. 9A , Fig. 9A yes Figure 3 The diagram is a schematic diagram of the equivalent expanded light path of the camera module 200 in the second embodiment.

[0209] 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. The light reflected from the photographed scene is refracted by the optical lens 10, passes through the filter 30, and is incident on the image sensor 20 to form an image.

[0210] Exemplarily, 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 .

[0211] The lens group 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 group 1. The lens group 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.

[0212] The optical folding element 2 includes a first part 2a, a second part 2b and a third part 2c which are sequentially connected from the object side to the image side. The light entering the optical folding element 2 passes through the first part 2a, the second part 2b and the third part 2c in sequence and then exits. The first part 2a can extend along a first direction, and the third part 2c can extend 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 planes where the first direction and the second direction are located 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, and the optical 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 optical folding element 2 can be a prism.

[0213] The light folding element 2 may include a top surface 24 and a bottom surface 25 arranged in parallel, and the arrangement direction of the top surface 24 and the bottom surface 25 is parallel to the optical axis O of the lens group 1. The light folding element 2 includes an incident surface 21, an exit surface 22 and a deflection reflection surface 23 ( Fig. 9A The incident surface 21 is located in the first part 2a and on the top surface 24; the exit surface 22 is located in the third part 2c and on the top surface 24; the deflection reflection surface 23 is located in the second part 2b and connects the top surface 24 and the bottom surface 25, and the deflection reflection surface 23 is parallel to the optical axis O of the lens group 1 and perpendicular to the top surface 24.

[0214] The light folding element 2 further includes a first reflection surface 26 and a second reflection surface 27. The first reflection surface 26 is located in the first portion 2a and connects the top surface 24 and the bottom surface 25. The second reflection surface 27 is located in the third portion 2c and connects the top surface 24 and the bottom surface 25. After the light enters the light folding element 2, it is reflected for the first time on the first reflection surface 26, reflected three times on the top surface 24 and the bottom surface 25, and reflected once on the deflection reflection surface 23 ( Fig. 9A(not shown), and the last reflection occurs on the second reflecting surface 27. At this time, the light is reflected six times in the light folding element 2, including one deflection reflection and five folding reflections.

[0215] In the embodiment of the present application, after the light is converged by the lens group 1, it enters the light folding element 2 through the incident surface 21 of the light folding element 2, and after six reflections in the light folding element 2, it is emitted from the exit surface 22 of the light folding element 2, and then imaged on the image sensor 20. The optical lens 10 reflects the converged light of the lens group 1 multiple times through the light folding element 2 to fold the light path, thereby shortening the physical space between the lens group 1 and the image sensor 20, thereby reducing the module size of the optical lens 10 and achieving miniaturization.

[0216] Among them, the light 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 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 200, which is conducive to miniaturization.

[0217] 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 miniaturized design.

[0218] 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, thereby facilitating the telephoto design of the optical lens 10.

[0219] Please refer to Table 2a, which is Figure 3 , Fig. 9A The curvature radius, thickness, refractive index (Nd), Abbe number (Vd), and effective radius of each lens, light folding element 2, and filter 30 of the camera module 200 in a possible embodiment are shown. The thickness includes the thickness of the structure itself and the spacing between the structures, and INF refers to infinity. STO is the aperture.

[0220] Table 2a

[0221]

[0222] Please refer to Table 2b, which is Figure 3 , Fig. 9A The aspheric coefficients of each lens of the camera module 200 in a possible embodiment are shown.

[0223] Table 2b

[0224] No. K A4 A6 A8 A10 A12 2 0.00E+00 -8.19E-05 1.28E-06 -5.40E-08 1.35E-09 -2.74E-11 3 0.00E+00 -7.65E-05 4.98E-06 -2.15E-07 3.75E-09 -2.54E-11 4 0.00E+00 -2.91E-04 -6.27E-06 2.85E-07 -1.49E-08 2.67E-10 5 0.00E+00 -4.88E-04 -2.15E-05 2.59E-07 -1.87E-08 -5.82E-10

[0225] Among them, K is the quadratic surface constant, and symbols such as A4, A6, A8, A10, and A12 represent aspheric coefficients.

[0226] 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:

[0227]

[0228] Where z is the relative distance between a point on the aspherical surface that is r away from the optical axis O and the tangent plane that is tangent to the optical axis O of the aspherical surface; r is the vertical distance between the point on the aspherical curve and the optical axis O; c is the curvature; k is the cone coefficient; α i is the i-th order aspheric coefficient.

[0229] Please refer to Table 2c, which is Figure 3 , Fig. 9A Parameters of the camera module 200 in a possible embodiment are shown. 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 optical 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 reflection 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 exit optical axis O' in the equivalent optical path.

[0230] Table 2c

[0231]

[0232] See also Fig. 9B , Fig. 9B yes Fig. 9A The illustrated diagram is a simulation effect diagram of the camera module 200 in a possible embodiment.

[0233] in, Fig. 9BIt includes axial chromatic aberration curve, astigmatism field curvature curve and distortion curve. Among them, the axial chromatic aberration curve indicates the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system. The reference wavelength of the axial chromatic aberration curve is 486.1nm, 587.6nm and 656.3nm. 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. Fig. 9B The median values ​​are all small, and the axial aberrations (spherical aberration, chromatic aberration, etc.) of the optical lens 10 are well corrected. The astigmatism field curvature curve represents the meridional image curvature and the sagittal image curvature, and is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface, wherein the solid line is the meridional direction light beam, the dotted line is the sagittal direction light 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-level aberrations. Fig. 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 between the convergence point of the light beam in different fields of view (actual image height) and the ideal image height. The reference wavelength of the distortion curve can be 486.1nm, 587.6nm, and 656.3nm. Fig. 9B The values ​​shown are all within 1%, ensuring that there is no obvious distortion in the image. Fig. 9B It can be seen that the camera module 200 provided in this embodiment can achieve good imaging quality. Fig. 9B Since the distortion curve is very close to the ordinate, there is an overlap with the ordinate in the figure.

[0234] The camera module 200 provided in this embodiment has a field of view FOV of 12.4° for the optical lens 10 when the object distance is infinite, a system focal length EFL of 33 mm, a total optical length TTL of the optical lens 10 of 39.92 mm, a total optical path length PL of the optical folding element 2 of 33.3 mm, and 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.

[0235] Third embodiment

[0236] Please refer to Figure 3 , Figure 4 as well as Fig. 10A , Fig. 10A yes Figure 3 FIG. 2 is a schematic diagram of an equivalent expanded light path of the camera module 200 in the third embodiment.

[0237] 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. The light reflected from the photographed scene is refracted by the optical lens 10, passes through the filter 30, and is incident on the image sensor 20 to form an image.

[0238] Exemplarily, 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 .

[0239] The lens group 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 group 1. The lens group 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. The first lens L1 has positive power, the second lens L2 has positive power, the third lens L3 has negative power, and the fourth lens L4 has positive power.

[0240] The optical folding element 2 includes a first part 2a, a second part 2b and a third part 2c which are sequentially connected from the object side to the image side. The light entering the optical folding element 2 passes through the first part 2a, the second part 2b and the third part 2c in sequence and then exits. The first part 2a can extend along a first direction, and the third part 2c can extend 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 planes where the first direction and the second direction are located 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, and the optical 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 optical folding element 2 can be a prism.

[0241] The light folding element 2 may include a top surface 24 and a bottom surface 25 arranged in parallel, and the arrangement direction of the top surface 24 and the bottom surface 25 is parallel to the optical axis O of the lens group 1. The light folding element 2 includes an incident surface 21, an exit surface 22 and a deflection reflection surface 23 ( Fig. 10A The incident surface 21 is located in the first part 2a and on the top surface 24; the exit surface 22 is located in the third part 2c and on the top surface 24; the deflection reflection surface 23 is located in the second part 2b and connects the top surface 24 and the bottom surface 25, and the deflection reflection surface 23 is parallel to the optical axis O of the lens group 1 and perpendicular to the top surface 24.

[0242] The light folding element 2 further includes a first reflection surface 26 and a second reflection surface 27. The first reflection surface 26 is located in the first portion 2a and connects the top surface 24 and the bottom surface 25. The second reflection surface 27 is located in the third portion 2c and connects the top surface 24 and the bottom surface 25. After the light enters the light folding element 2, it is reflected for the first time on the first reflection surface 26, reflected five times on the top surface 24 and the bottom surface 25, and reflected once on the deflection reflection surface 23 ( Fig. 10A(not shown), and the last reflection occurs on the second reflecting surface 27. At this time, the light is reflected eight times in the light folding element 2, including one deflection reflection and seven folding reflections.

[0243] In the embodiment of the present application, after the light is converged by the lens group 1, it enters the light folding element 2 through the incident surface 21 of the light folding element 2, and after eight reflections in the light folding element 2, it is emitted from the exit surface 22 of the light folding element 2, and then imaged on the image sensor 20. The optical lens 10 reflects the converged light of the lens group 1 multiple times through the light folding element 2 to fold the light path, thereby shortening the physical space between the lens group 1 and the image sensor 20, thereby reducing the module size of the optical lens 10 and achieving miniaturization.

[0244] Among them, the light 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 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 200, which is conducive to miniaturization.

[0245] 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 miniaturized design.

[0246] 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, thereby facilitating the telephoto design of the optical lens 10.

[0247] Please refer to Table 3a, which is Figure 3 , Fig. 10A The curvature radius, thickness, refractive index (Nd), Abbe number (Vd), and effective radius of each lens, light folding element 2, and filter 30 of the camera module 200 in a possible embodiment are shown. The thickness includes the thickness of the structure itself and the spacing between the structures, and INF refers to infinity. STO is the aperture.

[0248] Table 3a

[0249]

[0250] Please refer to Table 3b, which is Figure 3 , Fig. 10A The aspheric coefficients of each lens of the camera module 200 in a possible embodiment are shown.

[0251] Table 3b

[0252]

[0253]

[0254] Among them, K is the quadratic surface constant, and symbols such as A4, A6, A8, A10, and A12 represent aspheric coefficients.

[0255] 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:

[0256]

[0257] Where z is the relative distance between a point on the aspherical surface that is r away from the optical axis O and the tangent plane that is tangent to the optical axis O of the aspherical surface; r is the vertical distance between the point on the aspherical curve and the optical axis O; c is the curvature; k is the cone coefficient; α i is the i-th order aspheric coefficient.

[0258] Please refer to Table 3c, which is Figure 3 , Fig. 10A Parameters of the camera module 200 in a possible embodiment are shown in Table 3c. 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 optical 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 reflection 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 exit optical axis O' in the equivalent optical path.

[0259] Table 3c

[0260]

[0261] See also Fig. 10B , Fig. 10B yes Fig. 10A The illustrated diagram is a simulation effect diagram of the camera module 200 in a possible embodiment.

[0262] in, Fig. 10BIt includes axial chromatic aberration curve, astigmatism field curvature curve and distortion curve. Among them, the axial chromatic aberration curve indicates the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system. The reference wavelength of the axial chromatic aberration curve is 486.1nm, 587.6nm and 656.3nm. 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. Fig. 10B The median values ​​are all small, and the axial aberrations (spherical aberration, chromatic aberration, etc.) of the optical lens 10 are well corrected. The astigmatism field curvature curve represents the meridional image curvature and the sagittal image curvature, and is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface, wherein the solid line is the meridional direction light beam, the dotted line is the sagittal direction light 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-level aberrations. Fig. 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 between the convergence point of the light beam in different fields of view (actual image height) and the ideal image height. The reference wavelength of the distortion curve can be 486.1nm, 587.6nm, and 656.3nm. Fig. 10B The values ​​shown are all within 1%, ensuring that there is no obvious distortion in the image. Fig. 10B It can be seen that the camera module 200 provided in this embodiment can achieve good imaging quality. Fig. 10B Since the distortion curve is very close to the ordinate, there is an overlap with the ordinate in the figure.

[0263] The camera module 200 provided in this embodiment has a field of view FOV of 10.17° for the optical lens 10 when the object distance is infinite, a system focal length EFL of 40.28 mm, a total optical length TTL of 53.87 mm, a total optical path length PL of the optical folding element 2 of 47.9 mm, and the light is deflected and reflected once and folded and reflected seven times 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.

[0264] All the above drawings are illustrative illustrations of the present application. The drawings mainly illustrate the parts of the product related to the implementation methods of the present application. The product may still include other parts not shown in the drawings. In addition, the actual shape, actual position, actual size and proportion, actual structure, actual quantity, etc. of the parts or structures of the product are not limited by the drawings.

[0265] The above implementation modes 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 implementation modes, a person skilled in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some of the technical features can be replaced by equivalents. 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 implementation modes of the present application.

[0266] In the absence of conflict, the embodiments of the present application and the features in the embodiments may 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 may 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 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: 20mm≤EFL≤60mm, or, 30mm≤EFL≤50mm.

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