Optical lens, camera module and electronic equipment

Abstract

The invention provides an optical lens, a camera module and electronic equipment. The optical lens comprises a first lens group, a second lens group and a third lens group which are sequentially arranged from an object side to an image side along an optical axis; the first lens group comprises a first focusing lens with variable focal power, the first focusing lens is used for optical zooming of the optical lens from the main shooting end to the wide-angle end, and the focal power phi 1 of the first focusing lens at the main shooting end and the focal power phi 2 of the first focusing lens at the wide-angle end meet the condition that phi 1-phi 2 is larger than or equal to 0.01; at least two of the first lens group, the second lens group and the third lens group are movable along the optical axis, or at least one of the first lens group, the second lens group and the third lens group comprises a second focusing lens with variable focal power for optical zooming of the optical lens from the main shooting end to the wide angle end. According to the technical scheme, optical zooming in a large focusing range can be realized, so that the imaging quality is improved, the space occupied by the lens can be reduced, and the light weight, the thinness and the miniaturization of the camera module can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging, and more particularly, to an optical lens, a camera module and an electronic device. BACKGROUND

[0002] With the rapid development of electronic devices, in order to meet the diversified needs of users, many electronic devices are equipped with zoom lenses to achieve optical zoom. Generally, the focusing range of the zoom lens is positively correlated with the total optical length, the larger the focusing range, the larger the total optical length, and correspondingly the larger the space occupied by the zoom lens. Therefore, if the thinness and miniaturization of the lens are pursued, the zoom ratio that the lens can achieve is smaller, and the effects of object magnification, background blurring, etc. are not obvious, which affects the imaging quality. If a larger zoom ratio is pursued, the space size of the lens in the working state is larger, which is not conducive to the thinness and miniaturization design of the electronic device.

[0003] Therefore, how to reduce the size of the lens while ensuring that the lens has a larger focusing range is a problem to be solved. SUMMARY

[0004] The present application provides an optical lens, a camera module and an electronic device, which can achieve optical zoom with a larger focusing range to improve the imaging quality, and can reduce the space occupied by the lens to realize the thinness and miniaturization of the camera module.

[0005] In a first aspect, an optical lens is provided, comprising: a first lens group, a second lens group and a third lens group disposed in sequence along an optical axis from an object side to an image side; the first lens group comprising a first focus lens, the optical power of the first focus lens being variable for optical zoom of the optical lens from a primary camera end to a wide-angle end, wherein the optical power of the first focus lens at the primary camera end and the optical power of the first focus lens at the wide-angle end satisfying: At least two of the first lens group, the second lens group and the third lens group are movable along the optical axis, or at least one of the first lens group, the second lens group and the third lens group comprises a second focus lens with variable optical power for optical zoom of the optical lens from the primary camera end to the wide-angle end.

[0006] In the present application, through the cooperation of the first focus lens with variable optical power and at least two moving lens groups, or through the cooperation of the first focus lens and the second focus lens, continuous optical zoom of the camera module can be achieved, and the camera module has a larger focusing range and a shorter total optical length, which helps to improve the imaging quality and reduce the space ratio of the camera module.

[0007] Specifically, the optical lens incorporates a first focusing lens with variable optical power, which reduces space requirements while maintaining zoom performance. Furthermore, the first focusing lens increases the optical power of the main camera. Optical power at the wide-angle end of the first focusing lens Satisfying the above relationship, the first focusing lens 311 has a large zoom range and optical power distribution range from the main camera end to the wide-angle end, thus giving the optical lens a large zoom ratio.

[0008] Traditional movable lens arrays adjust the focal length to achieve zoom by moving the lens array along the optical axis. This method requires the movable lens array to have a large range of motion along the optical axis. However, the optical lens in this embodiment, through the introduction of a first focusing lens, can at least partially replace the function of moving the zoom, thereby eliminating or reducing the internal movement space requirement of the optical lens under the same zoom requirements, which is beneficial to achieving miniaturization and thinning of the module.

[0009] In conjunction with the first aspect, in one possible implementation, the first mirror group and the second mirror group are movable along the optical axis, and the third mirror group is a fixed mirror group.

[0010] The first and second mirror groups are located close to the object side, which can reduce the impact on other devices during the movement of the mirror groups while ensuring the space required for the movable stroke.

[0011] In conjunction with the first aspect, in one possible implementation, at least one of the first lens group, the second lens group, and the third lens group includes the second focusing lens, wherein at least one of the first lens group, the second lens group, and the third lens group is movable along the optical axis; or the first lens group, the second lens group, and the third lens group are fixed lens groups.

[0012] The combination of the first focusing lens, the second focusing lens, and at least one movable lens group can provide a wider range of optical power configurations, and can reduce space requirements while improving zoom performance (such as increasing the zoom ratio).

[0013] The combination of the first focusing lens, the second focusing lens, and the fixed lens group allows for a wide range of focal length adjustment without moving the lens group. Since the lens group does not need to move, components such as motors used to drive the lens group can be omitted, thereby simplifying the module structure and reducing costs.

[0014] In conjunction with the first aspect, in one possible implementation, the first lens group includes the first focusing lens, the second lens group includes the second focusing lens, and both the second and third lens groups are fixed lens groups; wherein the first lens group is movable along the optical axis, or the first lens group is a fixed lens group.

[0015] Different focusing lenses are located in different lens groups, which can increase the freedom of optical design.

[0016] In conjunction with the first aspect, in one possible implementation, the first focusing lens is the lens closest to the object side in the first lens group; and / or the second focusing lens is the lens closest to the first lens group in the second lens group.

[0017] The first focusing lens is located at the front of the first lens group, and / or the second focusing lens is located at the front of the second lens group, which facilitates driving the focusing lens and reduces the complexity of the module.

[0018] In conjunction with the first aspect, in one possible implementation, the effective focal length EFL2 of the optical lens at the wide-angle end and the corresponding half-image height IMH of the optical lens at the wide-angle end satisfy: 0.2≤EFL2 / IMH≤1.0.

[0019] The ratio of the effective focal length (EFL2) of an optical lens at the wide-angle end to the corresponding half-image height (IMH) of the optical lens at the wide-angle end satisfies the above relationship, which can increase the focal range of the optical lens at the wide-angle end and improve its wide-angle performance.

[0020] In conjunction with the first aspect, in one possible implementation, the refractive index n of the first lens on the object side in the second lens group satisfies: 1.2 ≤ n ≤ 2.0.

[0021] The imaging quality of the system can be improved by constraining the range of the refractive index n of the first lens located on the object side in the second lens group.

[0022] In conjunction with the first aspect, in one possible implementation, the pop-out stroke H of the optical lens and the maximum total optical length TTL of the optical lens satisfy: 0≤H / TTL≤0.5, where the pop-out stroke H of the optical lens is the difference between the maximum total optical length TTL of the optical lens and the total optical length TTL3 of the optical lens in the initial state.

[0023] The pop-out stroke H and the maximum optical length TTL satisfy the above relationship, which can constrain the pop-out range of the optical lens in the working state and reduce the thickness of the optical lens in the working and non-working states.

[0024] In conjunction with the first aspect, in one possible implementation, the optical lens further includes an aperture stop, wherein the focal length f1 of the first lens located on the object side in the second lens group at the main camera end and the focal length f2 of the first lens behind the aperture stop at the main camera end satisfy: |f1 / f2|≤10.

[0025] By constraining the range of the ratio between f1 and f2, the distribution of optical power can be balanced, thereby ensuring that the optical lens has good performance throughout the entire zoom range.

[0026] In conjunction with the first aspect, in one possible implementation, the effective focal length EFL1 of the optical lens at the main camera end and the effective focal length EFL2 of the optical lens at the wide-angle end satisfy: 1 ​​< EFL1 / EFL2 ≤ 1.9.

[0027] By constraining the ratio range between EFL1 and EFL2, optical lenses can have a larger zoom range, improving their zoom ratio and thus enhancing image quality. Furthermore, the larger zoom ratio of optical lenses allows for integrated structural designs, enabling the functionality of multiple traditional lenses (such as a main camera lens and a wide-angle lens) to be achieved with a single optical lens.

[0028] In conjunction with the first aspect, in one possible implementation, the total optical length TTL2 of the optical lens at the wide-angle end and the total optical length TTL1 of the optical lens at the main camera end satisfy: TTL2 / TTL1≤1.5.

[0029] By constraining the ratio between the total optical length TTL2 of the optical lens at the wide-angle end and the total optical length TTL1 of the optical lens at the main camera end, the optical lens can have a small total optical length throughout the zoom range, which can reduce space requirements while ensuring zoom needs.

[0030] In conjunction with the first aspect, in one possible implementation, the aperture value F1# of the optical lens at the main camera end and the aperture value F2# of the optical lens at the wide-angle end satisfy: 0≤|F1# / F2#|≤0.8.

[0031] By constraining the ratio range between F1# and F2#, the optical lens can have a larger aperture during zooming, which helps to increase the amount of light entering the optical lens during zooming and thus improve image quality.

[0032] In conjunction with the first aspect, in one possible implementation, the optical power of the last lens in the optical lens is negative.

[0033] The last lens in the optical lens has negative optical power and a diverging effect on light, which can further increase the size of the imaging target surface, thereby improving image quality.

[0034] In conjunction with the first aspect, in one possible implementation, the focal length f3 of the last lens in the optical lens and the effective focal length EFL2 of the optical lens at the wide-angle end satisfy: 0.5 ≤ |f3 / EFL2| ≤ 20.

[0035] By allocating optical power, the distortion at the edges of the system can be improved at the wide-angle end of the optical lens, thereby enhancing image quality.

[0036] In conjunction with the first aspect, in one possible implementation, the first focusing lens and / or the second focusing lens are liquid lenses.

[0037] Using a liquid lens as the focusing lens enables rapid and smooth focal length changes, and provides a wide zoom range, thereby improving the zoom ratio of the optical lens.

[0038] In conjunction with the first aspect, in one possible implementation, the first focusing lens and / or the second focusing lens are variable surface lenses, wherein the object side and / or image side of the variable surface lens are variable surface surfaces.

[0039] By changing the surface shape of a lens to alter its optical power, a smooth change in focal length can be achieved quickly, which is beneficial for improving the performance and flexibility of the optical system.

[0040] In conjunction with the first aspect, in one possible implementation, the number of lenses in the second group of lenses is greater than or equal to 2.

[0041] In a second aspect, a camera module is provided, including a photosensitive element and an optical lens of the first aspect and any aspect thereof, the optical lens being used to receive light from a subject and project it onto the photosensitive element.

[0042] In conjunction with the second aspect, in one possible implementation, the camera module also includes a motor for driving the optical lens to perform optical zoom.

[0043] In conjunction with the second aspect, in one possible implementation, the camera module further includes a prism or a reflector for changing the direction of the light path, so that the light passing through the prism or the reflector can propagate along the extension direction of the optical axis of the optical lens.

[0044] Thirdly, an electronic device is provided, including an image processor and a camera module as described in the second aspect above, wherein the image processor is communicatively connected to the camera module and is used to receive and process images acquired by the camera module.

[0045] The beneficial effects of the apparatus described in the second and third aspects above are the same as those described in the first aspect above, and will not be repeated here. Attached Figure Description

[0046] Figure 1 This is a schematic structural diagram of an electronic device to which this application embodiment applies.

[0047] Figure 2 This is a schematic exploded view of a camera module provided in an embodiment of this application.

[0048] Figure 3This is a schematic cross-sectional view of a camera module provided in an embodiment of this application.

[0049] Figure 4 This is a schematic structural diagram of a camera module provided in an embodiment of this application.

[0050] Figure 5 This is a schematic structural diagram of another camera module provided in the embodiments of this application.

[0051] Figure 6 This is a schematic structural diagram of a camera module in different states provided in the embodiments of this application.

[0052] Figure 7 yes Figure 6 A schematic diagram of the modulation transfer function curve of the camera module.

[0053] Figure 8 yes Figure 6 A schematic diagram of the distortion curve of the camera module in the image.

[0054] Figure 9 yes Figure 6 A schematic diagram of the imaging optical path of the camera module in the diagram.

[0055] Figure 10 This is a schematic structural diagram of a camera module in different states provided in the embodiments of this application.

[0056] Figure 11 yes Figure 10 A schematic diagram of the modulation transfer function curve of the camera module.

[0057] Figure 12 yes Figure 10 A schematic diagram of the distortion curve of the camera module in the image.

[0058] Figure 13 yes Figure 10 A schematic diagram of the imaging optical path of the camera module in the diagram.

[0059] Figure 14 This is a schematic structural diagram of a camera module in different states provided in the embodiments of this application.

[0060] Figure 15 yes Figure 14 A schematic diagram of the modulation transfer function curve of the camera module.

[0061] Figure 16 yes Figure 14 A schematic diagram of the distortion curve of the camera module in the image.

[0062] Figure 17 yes Figure 14 A schematic diagram of the imaging optical path of the camera module in the diagram.

[0063] Figure 18 This is a schematic structural diagram of a camera module in different states provided in the embodiments of this application.

[0064] Figure 19 yes Figure 18 A schematic diagram of the modulation transfer function curve of the camera module.

[0065] Figure 20 yes Figure 18 A schematic diagram of the distortion curve of the camera module in the image.

[0066] Figure 21 yes Figure 18 A schematic diagram of the imaging optical path of the camera module in the diagram. Detailed Implementation

[0067] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0068] It should be noted that, in the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in this article is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone.

[0069] In the embodiments of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more, and "at least one" and "one or more" refer to one, two, or more than two. The singular expressions "a," "an," "the," "the," "this," and "this" are intended to also include expressions such as "one or more," unless the context explicitly indicates otherwise.

[0070] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0071] In the description of the embodiments of this application, the terms "upper," "lower," "inner," "outer," "vertical," and "horizontal," etc., indicate orientations or positional relationships relative to the orientations or positions of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and not to indicate or imply a specific orientation that the device or component must have, or that it must be constructed and operated in a specific orientation. They can change accordingly depending on the orientation of the components in the accompanying drawings, and therefore should not be construed as limiting this application. Furthermore, "vertical" in this application is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Additionally, in the embodiments of this application, descriptions such as "when," "in the case of," "if," and "if" all refer to the device taking corresponding actions under certain objective circumstances, not to limiting the time, nor to requiring the device to perform a judgment action during implementation, nor implying any other limitations.

[0072] In the embodiments of this application, the same reference numerals are used to denote the same component or part. Furthermore, the parts in the drawings are not drawn to scale, and the dimensions and sizes of the parts shown are merely exemplary and should not be construed as limiting the scope of this application.

[0073] To facilitate understanding, the technical terms used in this application will be explained and described below.

[0074] Lens: A component that uses the refraction principle of a lens to allow light beams from a scene to pass through the lens and form a clear image on the focal plane.

[0075] Lens group: A combination of one or more lenses. A lens group can be configured to be relatively fixed, or it can be configured to move as a whole, or at least one lens in the lens group can move. In this application, a lens group can also be understood as a lens assembly.

[0076] Optical axis: An imaginary line in an optical system, which can be understood as the direction in which light rays are transmitted through the optical system. Specifically, the optical axis can be considered as an axis perpendicular to the center of each lens in a lens. For a symmetrical transmission system, its optical axis generally coincides with the rotation center line of the optical system.

[0077] Principal ray: refers to the ray that passes through the center of the entrance pupil and exit pupil of the system.

[0078] Object side and image side: With the lens as the boundary, the side where the subject is located is called the object side, and the side where the image of the subject is located is called the image side. The surface of the lens closer to the object side can be called the object-side surface, and the surface of the lens closer to the image side can be called the image-side surface.

[0079] Focal point: When a beam of light parallel to the optical axis enters a convex lens, an ideal convex lens should converge all the beams at a point behind the lens. This point where all the beams converge is the focal point.

[0080] 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 distance from the optical center of a lens or lens group to the focal point when a distant object is projected into a sharp image on the focal plane. It can also be understood as the perpendicular distance from the optical center of the lens or lens group to the focal plane. In practice, focal length refers to the distance from the center of the lens to the image plane, also known as effective focal length (EFL). For prime lenses, the position of their optical center remains fixed; for zoom lenses, changes in the optical center result in changes in the focal length.

[0081] Optical zoom: refers to changing the focal length by altering the relative positions of the lens elements inside the lens.

[0082] Zoom ratio: also known as zoom scale, is the ratio of the longest focal length to the shortest focal length of a zoom lens.

[0083] Optical power (focal power) is equal to the difference between the image-side beam convergence and the object-side beam convergence. It characterizes the ability of an optical system to deflect a beam. Lenses or lens groups with positive optical power have a positive focal length and converge beams. Lenses or lens groups with negative optical power have a negative focal length and diverge beams. Optical power is expressed as the reciprocal of the focal length.

[0084] A diaphragm is an edge, frame, or specially designed perforated barrier in an optical assembly used to limit the size of an imaging beam or a unit of imaging space.

[0085] Aperture stop (STO): It is an aperture stop that limits the maximum tilt angle of the edge beam in the on-axis point imaging beam, that is, the aperture stop with the smallest incident aperture angle.

[0086] Visual field diaphragm: This is an aperture that limits the imaging range of an optical system. Its main function is to limit the size of the object plane or image plane, thereby defining the imaging range of the optical system.

[0087] Aperture: This is a device used to control the amount of light passing through the lens and entering the camera's sensor. It is usually located inside the lens. Aperture size is expressed as F / .

[0088] Aperture F-number (F-number): also known as F#, F / #, F / NO., Fno., etc., is equal to the lens focal length (specifically the effective focal length EFL) divided by the entrance pupil diameter (or light-gathering diameter). With a fixed lens focal length, a larger entrance pupil diameter results in a larger aperture, a smaller F-number, more light entering the lens, a brighter image, and greater background blur. Conversely, a smaller entrance pupil diameter results in a smaller aperture, a larger F-number, less light entering the lens, a darker image, and sharper foreground and background.

[0089] Total track length (TTL): refers to the total length from the first surface of the lens element to the imaging plane, and is the main factor that determines the height of the camera.

[0090] Half image height (IMH): This refers to half the diagonal length of the effective pixel area on the image sensor, that is, the height from the edge of the image to the center of the image surface.

[0091] Field of view (FOV): Also known as the field of view, it refers to the angular range within an imaging scene that a camera can receive images of; it is also often referred to as the field of view. Specifically, the FOV can be considered as the angle between the two edges of the maximum range through which the image of the target object can pass through the lens, with the lens as the vertex. A larger FOV results in a wider field of view, lower optical magnification, and a shorter focal length.

[0092] Abbe number: also known as dispersion coefficient, is the ratio of the difference in refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0093] Aberrations: The paraxial region of an optical system possesses the properties of an ideal optical system, where paraxial light beams emitted from a point on an object intersect the image plane at a single point. However, in reality, light beams passing through different apertures of a lens rarely intersect perfectly at a single point; instead, they deviate to some extent from the position of the paraxial image point. These differences are collectively referred to as aberrations.

[0094] Distortion, also known as image distortion, refers to the degree of distortion in the image formed by an optical system relative to the object itself; it belongs to off-axis aberration. Distortion is caused by the spherical aberration of the aperture. The height of the intersection point between the main beam of light from different fields of view and 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. Distortion only changes the imaging position of the off-axis object point on the ideal plane, causing distortion in the image shape, but does not affect the image sharpness.

[0095] Field curvature: This refers to the difference in optical axis between the position of the sharpest image point after a beam of light from a non-center field of view passes through the lens module and the position of the sharpest image point in the center field of view. When a lens has field curvature, the intersection of the entire beam does not coincide with the ideal image point. Although a sharp image point can be obtained at each specific point, the entire image plane is a curved surface.

[0096] The modulation transfer function (MTF), also known as the spatial contrast transfer function or spatial frequency contrast sensitivity function, refers to the ratio of the contrast of the output image to that of the input image. MTF is a function of spatial frequency (usually expressed as 1p / mm) and reflects the ability of an optical system to transmit sinusoidal modulation of various frequencies. Since the contrast of the output image is always less than that of the input image, the MTF value ranges from 0 to 1. A larger MTF indicates better image quality; a MTF value of 1 indicates that the image contains all the information of the object and there is no distortion.

[0097] Spatial frequency: refers to the number of black and white stripe pairs that can be distinguished in 1 mm of image space, measured in line pairs per mm (lp / mm).

[0098] The diffraction limit refers to the phenomenon where, when an ideal object point is imaged by an optical system, an ideal image point cannot be obtained due to diffraction limitations; instead, a Fraunhofer diffraction image is obtained. Since the aperture of a typical optical system is circular, the Fraunhofer diffraction image is known as the Airy disk. Thus, the image of each object point is a diffuse spot, and two diffuse spots become difficult to distinguish when they are close together. This limits the system's resolution; the larger the spot, the lower the resolution.

[0099] Meridian plane: The plane formed by the principal beam passing through an object point outside the optical axis and the optical axis.

[0100] Sagittal surface: The plane that is perpendicular to the meridional plane and passes through the principal beam of the optical beam at an object point outside the optical axis.

[0101] Sagittal Aspect Ratio (SAG): This is measured along the sagittal plane of the lens, starting from its optical axis. The SAG primarily focuses on the lens's performance in the direction perpendicular to the optical axis, including parameters such as contrast and resolution. By analyzing the MTF curve in the SAG direction, one can understand the lens's ability to process high-frequency signals (such as detail and edge sharpness).

[0102] Meridian Direction (TAN): This is measured along the meridional plane of the lens. TAN primarily focuses on the lens's performance in the horizontal direction, including parameters such as contrast and resolution. By analyzing the MTF curve in the TAN direction, the lens's performance in processing horizontal signals can be evaluated, which can be used to assess the lens's performance when shooting moving objects or scenes requiring high-resolution images.

[0103] Lens shape: The lens shape refers to the geometric shape of the lens surface. The lens shape determines the lens's ability to refract and focus light. Based on different lens shapes, lenses can be broadly classified into the following categories: spherical lenses, aspherical lenses, and cylindrical lenses.

[0104] Spherical lens: A lens whose two surfaces are both spherical, or one surface is spherical and the other is flat. Spherical lenses include convex lenses (positive lenses) and concave lenses (negative lenses). Convex lenses are thicker in the center and thinner at the edges, while concave lenses are thinner in the center and thicker at the edges.

[0105] Aspherical lenses: The surface of an aspherical lens is not a simple sphere, but rather a more complex curved surface design. This design can reduce or eliminate certain optical aberrations found in spherical lenses, improving image quality. The aspherical coefficient of an aspherical lens affects its shape and optical performance.

[0106] Cylindrical lens: The surface of a cylindrical lens is part of a cylinder, curved in one dimension and flat in another. Cylindrical lenses are often used to change the aspect ratio of an image or to focus light onto a line.

[0107] Freeform surfaces: In optics, surfaces without a rotational axis of symmetry are generally referred to as freeform surfaces.

[0108] Rotationally symmetric aspherical surfaces are aspherical shapes on the lens surface that are rotationally symmetric about a certain axis, and have different local radii of curvature. Rotationally symmetric aspherical surfaces are described by the polynomial expansion of a deviated sphere (or an aspherical surface defined by conic coefficients).

[0109] Q-type aspherical surface: It is a rotationally symmetric aspherical surface. Its additional polynomial is an orthogonal polynomial, which can control the surface shape of the aspherical surface by controlling the root mean square depression deviation or root mean square slope, making aspherical parts easier to process and inspect.

[0110] Even-order aspherical surfaces: These are aspherical surfaces based on even-order power series polynomials.

[0111] Quadratic B-spline freeform surface (Qbfs): This is an aspherical design achieved using Quadratic B-spline technology. This design method allows designers to better control the optimization process of aspherical lenses by using orthogonal coefficients, while reducing the conditions required to manufacture aspherical lenses.

[0112] It should be noted that the above-described terms and concepts are for illustrative purposes only and should not be construed as limiting the embodiments of this application.

[0113] Figure 1 A schematic structural diagram of an electronic device to which embodiments of this application are applicable is shown.

[0114] In this application, the electronic devices involved are those with imaging capabilities, such as mobile phones, personal digital assistants (PDAs), tablet computers, laptop computers, cameras, video recorders, smartwatches, smart bracelets, point-of-sale (POS) terminals, in-vehicle systems, televisions (e.g., smart screens), wearable devices, virtual reality (VR) devices, and augmented reality (AR) devices. This application does not impose any special limitations on the specific form of the electronic device. For ease of explanation and understanding, the following description uses a mobile phone as an example.

[0115] For example, Figure 1 Images (a) and (b) schematically show the front and back of the electronic device 100, respectively. Figure 1 As shown, the electronic device 100 may include a housing 101, a display panel (DP) 102, and a camera compact module (CCM) 103.

[0116] The housing 101 has a receiving space for accommodating the components of the electronic device 100. The housing 101 also serves to protect the electronic device 100 and support the entire device. The display screen 102 and the camera module 103 are disposed within the receiving space of the housing 101 and connected to the housing 101. In some embodiments, the housing 101 may include a back cover opposite to the display screen 102 and a mid-frame disposed between the back cover and the display screen 102; the display screen 102 and the camera module 103 may be fixed to the mid-frame. The housing 101 may be made of metal, plastic, ceramic, or glass, etc.

[0117] The display screen 102 is used to display images, such as images captured by the camera module 103. The display screen 102 can be a liquid crystal display (LCD) screen, an organic light-emitting diode (OLED) screen, etc. The display screen 102 can be a regular screen, or an irregularly shaped screen, a foldable screen, etc. The display screen 102 can be located on the front and / or back of the electronic device 100. Here, the front of the electronic device 100 can be understood as the side facing the user when using the electronic device 100, and the back of the electronic device 100 can be understood as the side facing away from the user when using the electronic device 100.

[0118] The camera module 103 is used to capture still images or videos. The camera module 103 can be located on the front or back of the electronic device 100. A front-mounted camera module 103 can also be called a front-facing camera, and a rear-mounted camera module 103 can also be called a rear-facing camera. During shooting, the user can select the appropriate camera module according to their shooting needs. In some embodiments, when the display screen 102 can be folded, the camera module 103 can function as either a front-facing or rear-facing camera as the display screen 102 folds.

[0119] It is understandable that the placement of the camera module 103 can be determined based on actual needs. Figure 1 The installation positions shown are merely illustrative. For example, when the camera module 103 is used as a front-facing camera, it can be positioned at the top of the display screen 102 (e.g., near the earpiece); or, when the camera module 103 is used as a rear-facing camera, it can be positioned at the upper left corner, upper right corner, or the middle of the upper half of the back of the electronic device 100; or, the camera module 103 can be mounted on a component that is movable or rotatable relative to the display screen 102, allowing the camera module 103 to retract or rotate relative to the main body of the electronic device 100.

[0120] In some embodiments, the camera module 103 can be a vertical module or a folding module (or periscope camera module). A vertical camera module can be understood as light entering the camera module directly hitting the image sensor without bending the light path. A folding camera module can be understood as light entering the camera module needing to pass through optical elements such as reflectors, lenses, and prisms before hitting the image sensor, resulting in a folded light path.

[0121] This application embodiment does not limit the number of camera modules 103; it can be one, two, four, or even more. When multiple camera modules 103 are set, these multiple camera modules 103 can be different. For example, the multiple camera modules 103 may have different lens optical parameters, different lens placement positions and numbers, and different lens shapes. This application embodiment does not limit the relative positions of the multiple camera modules; for example, the multiple camera modules may be arranged in a straight line or in a ring. In some embodiments, one or more of the multiple camera modules 103 can serve as the main camera module. Typically, the main camera module is responsible for the main shooting task, usually has the highest pixel count, and can provide higher resolution and a more powerful sensor, thereby meeting the user's photography needs in different scenarios.

[0122] In this embodiment of the application, among the one or more camera modules 103 disposed on the electronic device 100, at least one camera module 103 is a zoom lens capable of optical zoom. The zoom lens can continuously change the focal length within a certain range, thereby capturing objects at different distances and producing high-resolution, clear images.

[0123] In some embodiments, the electronic device 100 may further include a protective lens 104 for protecting the camera module 103. The protective lens 104 is disposed on the housing 101 and covers the camera module 103. In some embodiments, the protective lens 104 may also cover the display screen 102 of the electronic device 100 or the back of the electronic device 100. The material of the protective lens 104 may be glass, sapphire, ceramic, etc., and this application does not impose any particular limitation on it. For example, the protective lens 104 is transparent, and light from outside the electronic device 100 can enter the camera module 103 through the protective lens 104.

[0124] In some embodiments, the electronic device 100 may further include an image processor 105, which is located within the receiving space formed by the housing 101 and is communicatively connected to the camera module 103. The image processor 105 is used to acquire image data from the camera module 103 and process the image data. The communication connection between the image processor 105 and the camera module 103 may include data transmission via electrical connections such as wiring, or data transmission via coupling or other methods. It is understood that the image processor 105 and the camera module 103 may also be connected via other methods capable of data transmission.

[0125] The image processor 105 optimizes the digital image signal and transmits the processed signal to the display screen 102. The image processor 105 can be an image processing chip or a digital signal processing chip. Its function is to transmit the data obtained by the photosensitive chip to the central processing unit in a timely and fast manner and refresh the photosensitive chip. Therefore, the quality of the image processor 105 directly affects the image quality (such as color saturation, sharpness, etc.).

[0126] In some embodiments, the electronic device 100 may further include a circuit board located in the receiving space formed by the housing 101, and the image processor 105 is fixed to the circuit board and electrically connected to the circuit board.

[0127] In some embodiments, the electronic device 100 may further include an analog-to-digital converter (also called an A / D converter, not shown in the figure). The analog-to-digital converter is connected between the camera module 103 and the image processor 105. The analog-to-digital converter is used to convert the signal generated by the camera module 103 into a digital signal and transmit it to the image processor 105. After being processed by the image processor 105, the digital image signal can be transmitted to the display module, and finally displayed as an image or video on the display screen 102.

[0128] In some embodiments, the electronic device 100 may further include a memory (not shown) communicatively connected to the image processor 105. The image processor 105 processes the digital image signal before transmitting the image to the memory, so that the image can be retrieved from the memory and displayed on the display screen 102 at any time when it is needed to view the image later. In some embodiments, the image processor 105 may also compress the processed digital image signal before storing it in the memory to save memory space.

[0129] It should be understood that Figure 1The structure shown in the diagram does not constitute a specific limitation on the electronic device 100. The electronic device 100 may include more or fewer components than shown in the diagram. For example, the electronic device 100 may also include one or more of the following components: battery, flash, earpiece, buttons, sensors, etc. Or the electronic device 100 may not include the display screen 102, or the electronic device 100 may have a different component arrangement than shown in the diagram.

[0130] Figure 2 and Figure 3 A schematic diagram of the structure of a camera module provided in an embodiment of this application is shown. Figure 2 This is a schematic exploded view of camera module 200. Figure 3 This is a schematic cross-sectional view of the camera module 200. Figure 2 The camera module 200 in the middle can be Figure 1 An exemplary structure of the camera module 103 is shown below. (The following is in conjunction with...) Figure 2 and Figure 3 A brief introduction to the structure of camera module 200.

[0131] For ease of description, the optical axis direction of the camera module 200 is defined as the Z direction, and the two directions perpendicular to the optical axis are the X direction and the Y direction, with the X direction perpendicular to the Y direction. In this embodiment, the optical axis direction is the direction in which the optical system transmits light. The side facing the object along the optical axis direction is the front side, and the side facing away from the object is the rear side.

[0132] Here, the definitions of X, Y, Z directions, as well as front and back, also apply to the accompanying drawings described below. It should be noted that the above definitions of X, Y, Z directions, front and back are merely for the convenience of describing the positional, connection, or motion relationships between the components in the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0133] like Figure 2 and Figure 3 As shown, the camera module 200 may include a housing 210, a lens assembly 220, a lens actuator 230, and a photosensitive assembly 240.

[0134] The housing 210 has a receiving space for accommodating the lens assembly 220, lens actuator 230, photosensitive element 240, etc. Additionally, the housing 210 also serves a protective and support function. This is understandable. Figure 2 and Figure 3 The structure of the housing 210 shown is merely exemplary and does not limit the scope of this application. Those skilled in the art can design the shape of the housing 210 according to actual needs.

[0135] The lens assembly 220, also known as an optical lens, mainly includes a lens group 221 and a lens barrel 222, wherein the lens group 221 is housed within the receiving space formed by the lens barrel 222. The lens assembly 220 is used to image the scene on the object side onto the image plane on the image side. In some embodiments, the lens assembly 220 can also perform certain processing on the received imaging beam, such as aberration correction and chromatic aberration elimination. Here, the imaging beam refers to the beam formed by the light incident on the camera module 200.

[0136] Lens group 221 may include at least one lens. The at least one lens may be different or at least partially the same. This application embodiment does not specifically limit the number of lenses included in lens group 221. Those skilled in the art can set the number of lenses according to actual needs, such as 1, 2, 3, 5, 8 or more.

[0137] The focal length of lens group 221 can be fixed, and correspondingly, lens assembly 220 is a prime lens. Alternatively, the focal length of lens group 221 can be adjustable, and correspondingly, lens assembly 220 is a zoom lens. For example, if lens assembly 220 is a zoom lens, the focal length of lens group 221 can be adjusted by changing the relative positions of the lenses within it.

[0138] The lens barrel 222 has a receiving space, primarily for accommodating the lens assembly 221. In some embodiments, the lens barrel 222 can be a single unit, with the lens assembly 221 housed within this single unit. In other embodiments, the lens barrel 222 may also comprise multiple lens barrel sections, with the lenses of the lens assembly 221 grouped within these multiple lens barrel sections, where a group of lenses can be referred to as a lens group. Exemplarily, the relative positions between these multiple lens barrel sections can be adjusted, enabling optical zoom by adjusting the relative positions of the lenses.

[0139] Understandable. Figure 2 and Figure 3 The structure of the lens barrel 222 and the connection method between the lens group 221 and the lens barrel 222 are merely exemplary and do not limit the embodiments of this application.

[0140] The lens actuator 230 is used to move the lens assembly 220 to achieve at least one of the following functions: autofocus, optical image stabilization, and optical zoom. In some embodiments, the lens actuator 230 may also be referred to as a lens motor, or simply a motor.

[0141] like Figure 3As shown, the lens assembly actuator 230 may include a motor (hereinafter referred to as the AF motor) 231 for moving the lens assembly 220 for AF and / or a motor (hereinafter referred to as the OIS motor) 232 for moving the lens assembly 220 for OIS. Specifically, the AF motor 231 is used to move the lens assembly 220 for autofocus in the Z direction, and the OIS motor 232 is used to move the lens assembly 220 for optical image stabilization in the X and / or Y directions.

[0142] In some embodiments, the AF motor 231 and the OIS motor 232 can be two independent components, each driving the lens assembly 220 independently for AF and OIS. Alternatively, the AF motor 231 and the OIS motor 232 can be integrated into one unit, with a single motor driving the lens assembly 220 for AF and OIS. Figure 3 The lens assembly actuator 230 is illustrated by way of separate AF motor 231 and OIS motor 232, but it should be understood that the embodiments of this application are not limited thereto.

[0143] In some embodiments, the AF motor 231 or the OIS motor 232 can be used to move the entire lens assembly 220, or to move a portion of the lens assembly 220. For example, if one part of the lens assembly 220 is relatively fixed and another part is movable, the AF motor 231 or the OIS motor 232 can drive the movable part to move, thereby changing the optical path to achieve the desired function.

[0144] In some embodiments, if the lens assembly 220 is a zoom lens, the lens actuator 230 may include a motor for optical zoom (hereinafter referred to as a zoom motor for ease of description). The zoom motor is used to drive a portion of the lenses in the lens assembly 220 to move along the optical axis, thereby achieving optical zoom by changing the distance between the lenses.

[0145] In some embodiments, the zoom motor and the AF motor 231 can be two separate components, performing optical zoom and autofocus respectively. Alternatively, the zoom motor and the AF motor 231 can be the same component, meaning the AF motor can perform both autofocus and optical zoom.

[0146] In some embodiments, the AF motor 231, OIS motor 232, or zoom motor can be a voice coil motor (VCM), a shape memory alloy (SMA) motor, a stepping motor, a piezoelectric motor, etc. It should be understood that the specific structure of the AF motor 231, OIS motor 232, or zoom motor can be designed and selected according to the chosen driving method, and this application embodiment does not limit this.

[0147] The photosensitive component 240 is disposed on the rear side of the lens assembly 220 and is mainly used for imaging. For example, the photosensitive component 240 may include a filter 241, an image sensor 242, and a circuit board 243.

[0148] A filter 241 is disposed between the lens assembly 220 and the image sensor 242. The filter 241 eliminates unwanted light projected onto the image sensor 242, preventing ghosting, stray light, and color cast during image formation. Exemplarily, the filter 241 can be an infrared cut-off filter. In some embodiments, the filter 241 can be a separate component; in other embodiments, the filter structure can be omitted, and filtering can be achieved by surface treatment or material treatment of at least one optical element of the lens assembly 220. This application does not specifically limit the specific embodiments of the structure or component used to achieve filtering.

[0149] Image sensor 242 is a semiconductor chip used to convert collected external light signals into electrical signals. Specifically, the surface of image sensor 242 contains hundreds of thousands to millions of photodiodes. These photodiodes generate charges when illuminated, thereby converting the light signals collected by lens assembly 220 into electrical signals. For example, image sensor 242 may be a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) device.

[0150] Circuit board 243 is used to transmit electrical signals, and it can be a flexible printed circuit (FPC) or a printed circuit board (PCB). Image sensor 242 can be electrically connected to circuit board 243 via wires to extract signals.

[0151] In some embodiments, the photosensitive component 240 may further include a microelectromechanical system (MEMS) actuator 244, which drives the image sensor 242 to move along the optical axis and / or perpendicular to the optical axis, thereby achieving autofocus and / or optical image stabilization. The MEMS actuator 244 can be driven by electrostatic force, magnetoelectric force, piezoelectric force, thermoelectric force, etc. It should be understood that the specific structure of the MEMS actuator 244 can be designed and selected according to the chosen driving method, and this application does not limit it in this regard.

[0152] For example, the working principle of the camera module 200 is as follows: the light beam reflected or radiated by the subject passes through the lens assembly 220 to generate an optical image and is projected onto the photosensitive surface of the image sensor 242; the image sensor 242 converts the optical image into an electrical signal (i.e., an analog image signal) and transmits it to the analog-to-digital converter; the analog-to-digital converter converts the analog image signal into a digital image signal and transmits the digital image signal to the image processor 105.

[0153] It should be understood that Figure 2 and Figure 3 The structure shown in the diagram does not constitute a specific limitation on the camera module 200. The camera module 200 may include more or fewer components than shown in the diagram. For example, the camera module 200 may also include connectors and peripheral electronic components, which will not be described in detail here.

[0154] With the continuous development of terminal technology, camera functionality has become an important feature of electronic devices and a key indicator for evaluating their performance. To meet diverse user needs, some electronic devices are equipped with zoom lenses to achieve optical zoom, ensuring clear imaging of both near and far objects while maintaining image quality. Generally, the focusing range of a zoom lens is positively correlated with its total optical length; a larger focusing range results in a larger total optical length, and consequently, a larger space occupied by the zoom lens. Therefore, zoom lenses in current electronic devices are mostly used for adjusting short focal lengths to reduce lens thickness. For longer focal lengths, if the goal is to achieve a thinner and smaller lens, the zoom magnification is relatively small, resulting in less noticeable magnification and background blur effects, thus affecting image quality. Conversely, if a larger zoom magnification is desired, the lens's size in operation is larger, hindering the design of thinner and smaller electronic devices.

[0155] In view of this, this application provides an optical lens and a camera module including the optical lens, which can achieve optical zoom with a large focusing range to improve image quality, and can reduce the space occupied by the lens to achieve the thinness and miniaturization of the camera module.

[0156] Figure 4 A schematic architecture diagram of a camera module provided in an embodiment of this application is shown. Figure 4 The camera module 300 shown can be applied to, for example... Figure 1 The electronic device 100 shown, such as the camera module 300, can be as follows: Figure 2 An example of a camera module 200 is shown.

[0157] refer to Figure 4The camera module 300 includes an optical lens 310 and a photosensitive element 320 arranged sequentially along the direction of incident light propagation. The optical lens 310 is used to receive light from the subject and project it onto the photosensitive element 320. The optical lens 310 is a zoom lens with a variable focal length (or optical power), thereby enabling the acquisition of different field of view angles, different image sizes, and different ranges of scenery.

[0158] In this embodiment, the working modes of the optical lens 310 include main camera mode and wide-angle mode.

[0159] The main camera mode features a moderate focal length and normal angle of view, providing a relatively balanced perspective and depth of field, suitable for most everyday shooting scenarios, such as portrait photography. The focal length and angle of view design in main camera mode can capture a more natural visual effect while maintaining image sharpness. For example, the field of view in main camera mode is less than or equal to 90°. In some embodiments, the field of view in main camera mode is greater than or equal to 75°.

[0160] Wide-angle mode has a shorter focal length and a wider angle of view, allowing more scenery to be captured in the frame. It is suitable for shooting scenes that require a wide field of view or an emphasis on the sense of depth, such as landscapes, architecture, and large-scale scenes. The focal length and angle of view design in wide-angle mode allow for capturing a larger area of ​​scenery within a shorter focal length range. For example, the field of view in wide-angle mode is greater than 90°.

[0161] In this embodiment, in main camera mode, the focal length of the optical lens 310 is within a first focal length range, and the angle of view is within a first angle of view range. The end with the longest focal length and smallest angle of view when the optical lens 310 is in main camera mode is called the main camera end, which is also the limit of the lens travel in main camera mode. In wide-angle mode, the focal length of the optical lens 310 is within a second focal length range, and the angle of view is within a second angle of view range. The end with the shortest focal length and largest angle of view when the optical lens 310 is in wide-angle mode is called the wide-angle end, which is also the limit of the lens travel in wide-angle mode.

[0162] In other words, the longest focal length of the optical lens 310 is the main camera end, and the shortest focal length of the optical lens 310 is the wide-angle end. When shooting, the optical lens 310 can use any focal length within the range of these two focal length endpoints.

[0163] like Figure 4 As shown, the optical lens 310 includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the image side along the optical axis.

[0164] The first lens group G1 includes a first focusing lens 311 with variable optical power, and at least two of the first lens group G1, the second lens group G2, and the third lens group G3 are movable along the optical axis for optical zoom of the optical lens 310 from the main camera end to the wide-angle end. For example, the first focusing lens 311 is a variable-surface liquid lens.

[0165] Among them, the first focusing lens 311 has a higher optical power at the main camera end. Optical power of the first focusing lens 311 at the wide-angle end satisfy:

[0166] In the above embodiments, by cooperating with the first focusing lens 311 with variable optical power and at least two moving lens groups, continuous optical zoom of the camera module can be achieved. The camera module has a large focusing range and a short total optical length, which helps to improve image quality and reduce the space ratio of the camera module.

[0167] Specifically, the optical lens 310 incorporates a first focusing lens 311, whose optical power is variable. This allows for reduced space requirements while maintaining zoom performance. Furthermore, the optical power of the first focusing lens 311 at the main camera end... Optical power of the first focusing lens 311 at the wide-angle end Satisfying the above relationship, the curvature value of the first focusing lens 311 varies over a large range from the main camera end to the wide-angle end, which also means that the first focusing lens 311 has a large zoom range and optical power distribution range, resulting in a large zoom ratio for the optical lens.

[0168] Traditional movable lens arrays adjust the focal length to achieve zoom by moving the lens array along the optical axis. This method requires the movable lens array to have a large range of motion along the optical axis. However, the optical lens 310 in this embodiment, through the introduction of the first focusing lens 311, can at least partially replace the function of moving the zoom, thereby eliminating or reducing the internal movement space requirement of the optical lens under the same zoom requirements, which is beneficial to achieving miniaturization and thinning of the module.

[0169] When the first lens group G1 is a movable lens group, because the optical power of the first focusing lens 311 is variable, the optical power (or focal length) of the first lens group G1 is also variable. Therefore, the focal length of the camera module can be changed by moving along the optical axis and by changing its own optical power. The introduction of the first focusing lens 311 can reduce the focal length of the camera module at the wide-angle end, increase the field of view and the zoom ratio of the system, under the same lens group movement travel requirement; or reduce the movable travel of the first lens group G1 and reduce the overall optical length of the system under the same zoom requirement.

[0170] For example, the optical lens 310 can be as follows: Figure 2 As shown in the example of lens assembly 220, the photosensitive element 320 can be as follows: Figure 2 An example of an image sensor 242 is shown.

[0171] In some embodiments, in the camera module 300, the first lens group G1 and the second lens group G2 are movable along the optical axis, while the third lens group G3 is a fixed lens group. The first lens group G1 and the second lens group G2 are close to the object side, which can reduce the impact on other devices during the movement of the lens group while ensuring the space required for the movable stroke.

[0172] Figure 5 A schematic architecture diagram of another camera module provided in an embodiment of this application is shown. Figure 5 The camera module 400 shown can be applied to, for example... Figure 1 The electronic device 100 shown, such as the camera module 400, can be as follows: Figure 2 An example of a camera module 200 is shown.

[0173] refer to Figure 5 The camera module 400 includes an optical lens 310 and a photosensitive element 320 arranged sequentially along the direction of incident light propagation. The optical lens 310 receives light from the subject and projects it onto the photosensitive element 320. The optical lens 310 is a zoom lens with a variable focal length (or optical power), enabling the acquisition of different field of view angles, image sizes, and scene ranges. For example, the optical lens 310 can continuously zoom between a wide-angle end and a main camera end. For a description of the main camera end and the wide-angle end, please refer to the relevant description of the camera module 300; for brevity, it will not be repeated here.

[0174] like Figure 5 As shown, the optical lens 310 includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the image side along the optical axis.

[0175] The first lens group G1 includes a first focusing lens 311 with variable optical power, and at least one of the first lens group G1, the second lens group G2 and the third lens group G3 includes a second focusing lens 312 with variable optical power. The first focusing lens 311 and the second focusing lens 312 are used for optical zoom of the optical lens 310 from the main camera end to the wide-angle end.

[0176] Among them, the first focusing lens 311 has a higher optical power at the main camera end. Optical power of the first focusing lens 311 at the wide-angle end satisfy:

[0177] For example, the optical lens 310 can be as follows: Figure 2 As shown in the example of lens assembly 220, the photosensitive element 320 can be as follows: Figure 2 An example of an image sensor 242 is shown.

[0178] In the above embodiments, the continuous optical zoom of the camera module can be achieved through the cooperation of the first focusing lens 311 and the second focusing lens 312. The camera module has a large focusing range and a short optical length, which helps to improve image quality and reduce the space ratio of the camera module.

[0179] Specifically, the optical lens 310 incorporates a first focusing lens 311 and a second focusing lens 312. The optical power of both the first focusing lens 311 and the second focusing lens 312 is variable, which can reduce space requirements while maintaining zoom performance. The first focusing lens 311 has a variable optical power at the main camera end. Optical power of the first focusing lens 311 at the wide-angle end Satisfying the above relationship, the curvature value of the first focusing lens 311 varies over a large range from the main camera end to the wide-angle end, which also means that the first focusing lens 311 has a large zoom range and optical power distribution range, resulting in a large zoom ratio for the optical lens.

[0180] Traditional movable lens arrays adjust the focal length to achieve zoom by moving the lens array along the optical axis. This method requires the movable lens array to have a large range of motion along the optical axis. However, the optical lens 310 in this embodiment, through the introduction of the first focusing lens 311 and the second focusing lens 312, can at least partially replace the function of moving the zoom, thereby eliminating or reducing the internal movement space requirement of the optical lens under the same zoom requirements, which is beneficial to achieving miniaturization and thinning of the module.

[0181] In some embodiments, in the camera module 400, at least one of the first lens group G1, the second lens group G2, and the third lens group G3 is movable along the optical axis. That is, at least one of the first lens group G1, the second lens group G2, and the third lens group G3 is a movable lens group.

[0182] In this way, the combination of the first focusing lens 311, the second focusing lens 312 and at least one movable lens group can provide a wider range of optical power configurations, and can reduce space requirements while improving zoom performance (such as increasing the zoom ratio).

[0183] For example, the first mirror group G1 is movable along the optical axis, while the second mirror group G2 and the third mirror group G3 are fixed mirror groups.

[0184] In other embodiments, in the camera module 400, the first lens group G1, the second lens group G2, and the third lens group G3 are all fixed lens groups. That is, the first lens group G1, the second lens group G2, and the third lens group G3 do not move along the optical axis. However, the first focusing lens 311 and the second focusing lens 312 can change their surface shape at relatively fixed positions, thereby changing the optical power.

[0185] This allows for a wide range of focal length adjustment without moving the lens group. Since the lens group does not need to move, components such as motors used to drive its movement can be omitted, thus simplifying the module structure and reducing costs.

[0186] In some embodiments, the first lens group G1 includes a first focusing lens 311, and the second lens group G2 includes a second focusing lens 312. The different focusing lenses located in different lens groups increase the freedom of optical design.

[0187] In some embodiments, the second focusing lens 312 is the lens in the second lens group G2 that is closest to the first lens group G1. The second focusing lens 312 is located at the front end of the second lens group G2, which facilitates driving the second focusing lens 312 and reduces the complexity of the module.

[0188] Understandable. Figure 4 The camera module 300 shown and Figure 5 The camera module 400 shown represents two different module architectures provided in this application. Both can achieve optical zoom with a large magnification ratio to improve image quality, and can reduce the space occupied by the lens to achieve a thinner and smaller camera module.

[0189] It should be noted that, unless otherwise stated, the embodiments described below are to be understood as applicable to both camera module 300 and camera module 400.

[0190] In some embodiments, reference Figure 4 or Figure 5 The effective focal length EFL2 of the optical lens 310 at the wide-angle end and the corresponding half-image height IMH of the optical lens 310 at the wide-angle end satisfy: 0.2≤EFL2 / IMH≤1.0.

[0191] The ratio of the effective focal length (EFL2) of the optical lens 310 at the wide-angle end to the corresponding half-image height (IMH) of the optical lens 310 at the wide-angle end is in the range of 0.2-1, which can increase the focal length range of the optical lens 310 at the wide-angle end and improve its wide-angle performance.

[0192] In some embodiments, reference Figure 4 or Figure 5The refractive index n of the first lens 313 located on the object side in the second lens group G2 satisfies: 1.2 ≤ n ≤ 2.0. Here, the first lens 313 located on the object side in the second lens group G2 is the lens in the second lens group G2 that is closest to the first lens group G1.

[0193] By constraining the range of the refractive index n of the first lens 313 located on the object side in the second lens group G2, the imaging quality of the system can be improved.

[0194] In some embodiments, reference Figure 4 or Figure 5 The pop-out stroke H of the optical lens 310 and the maximum total optical length TTL of the optical lens 310 satisfy: 0≤H / TTL≤0.5, where the pop-out stroke H of the optical lens 310 is the difference between the maximum total optical length TTL of the optical lens 310 and the total optical length TTL3 of the optical lens 310 in the initial state.

[0195] The pop-out stroke H and the maximum optical length TTL satisfy the above relationship, which can constrain the pop-out range of the optical lens 310 in the working state and reduce the thickness of the optical lens 310 in the working and non-working states.

[0196] It should be noted that the optical lens 310 has a working state and a non-working state. When powered on, the optical lens 310 is in the working state, and its focal length can change. When powered off, the optical lens 310 is in the non-working state (or initial state), and its focal length is a preset initial value. When the optical lens 310 is in the non-working state, the position of the first lens group G1 is the initial position of the first lens group G1, the position of the second lens group G2 is the initial position of the second lens group G2, and the position of the third lens group G3 is the initial position of the third lens group G3. Correspondingly, the total optical length TTL3 of the optical lens 310 in the non-working state is the initial total optical length. When the optical lens 310 is in the working state, since the optical lens 310 can optically zoom, its total optical length may change during the optical zoom process. The maximum total optical length of the optical lens 310 involved in this application refers to the maximum total optical length of the optical lens 310 in the working state. The pop-out travel of the optical lens 310 is the maximum distance that the optical lens 310 moves relative to its initial position during the zoom process after it starts from its initial position.

[0197] For example, if the total optical length of the optical lens 310 at the wide-angle end is less than the total optical length at the main camera end, in order to save space and protect the lens, the optical lens 310 can be positioned at the wide-angle end when not in operation. Then, the pop-out stroke H of the optical lens 310 is the difference between the total optical length TTL1 at the main camera end and the total optical length TTL2 at the wide-angle end.

[0198] In some embodiments, the pop-out stroke H of the optical lens 310 is greater than or equal to 0 and less than or equal to 10.2 mm. For example, the pop-out stroke H of the optical lens 310 is less than or equal to 2.4 mm.

[0199] In some embodiments, the maximum total optical length (TTL) of the optical lens 310 is less than or equal to 15 mm. For example, the TTL is 14.5 mm, 13.3 mm, etc.

[0200] In some embodiments, when the optical lens 310 is in a non-operating state (i.e., the state when it is powered off), the total optical length TTL3 of the optical lens 310 is less than or equal to the smaller of the total optical length TTL2 of the optical lens 310 at the wide-angle end and the total optical length TTL1 of the optical lens 310 at the main camera end. For example, TTL3 ≤ TTL2 ≤ TTL1.

[0201] In this way, the optical lens 310 is in a compressed state when not in operation, with a smaller overall optical length and a compact arrangement between the lens groups, which helps to improve the stability of the camera module.

[0202] In other embodiments, when the optical lens 310 is in a non-operating state, the total optical length TTL3 of the optical lens 310 is less than or equal to the larger of TTL1 and TTL2, and greater than or equal to the smaller of TTL1 and TTL2. For example, TTL2≤TTL3≤TTL1, or TTL1≤TTL3≤TTL2.

[0203] In this way, when the optical lens 310 changes from a non-working state to a working state, the motor stroke is shorter, which can save power consumption.

[0204] In some embodiments, when the optical lens 310 is in a non-working state, the total optical length TTL3 of the optical lens 310 is less than or equal to 15 mm. For example, TTL3 is 13.0 mm, 10.9 mm, etc.

[0205] In some embodiments, reference Figure 4 or Figure 5 The optical lens 310 also includes an aperture stop 314. The focal length f1 of the first lens 313 located on the object side in the second lens group G2 at the main camera end and the focal length f2 of the first lens 315 behind the aperture stop 314 at the main camera end satisfy: |f1 / f2|≤10.

[0206] The focal length f1 of the first lens 313 located on the object side in the second lens group G2 affects the wide-angle performance of the optical lens 310, and the focal length f2 of the first lens 315 behind the aperture stop 314 affects the telephoto performance of the optical lens 310. By constraining the range of the ratio of f1 to f2, the distribution of optical power can be balanced, so that the optical lens 310 has good performance throughout the zoom range.

[0207] In some embodiments, reference Figure 4 or Figure 5 The optical lens 310 also includes an aperture stop 314. The focal length f1' of the first lens 313 located on the object side in the second lens group G2 at the wide-angle end and the focal length f2' of the first lens 315 behind the aperture stop 314 at the wide-angle end satisfy: |f1' / f2'|≤50.

[0208] By constraining the range of the ratio of f1' to f2', the distribution of optical power can be balanced, thereby enabling the optical lens 310 to have good performance throughout the zoom range.

[0209] In some embodiments, the aperture stop 314 can be an aperture stop or a field stop. The aperture stop 314 can limit the range of the light beam, thereby balancing the difference in lens aperture before and after the aperture stop, and the aperture stop can reduce stray light in the lens, which is beneficial to improving image quality.

[0210] The aperture stop 314 can be positioned between the first and second lenses of the optical lens 310 from the object side, or between the first lens group G1 and the second lens group G2, or before the first lens group G1. This application does not impose any special limitations on this. In practical applications, those skilled in the art can design it according to their needs.

[0211] Aperture 314 can be either a movable aperture or a fixed aperture, depending on the movement of the lens group near aperture 314. For example, if the lens group in front of aperture 314, the lens group behind aperture 314, or the lens group to which aperture 314 is located is a movable lens group, then aperture 314 can be moved along the optical axis. As another example, if the lens group consists entirely of fixed lens groups, then aperture 314 is also a fixed aperture.

[0212] In some embodiments, the aperture 314 may be a spacer structure or a variable fan blade structure; or, the aperture 314 may be formed by a surface spraying process, for example by spraying a light-shielding material onto a lens to form the aperture 314.

[0213] In some embodiments, reference Figure 4 or Figure 5 The effective focal length EFL1 of the optical lens 310 at the main camera end and the effective focal length EFL2 of the optical lens 310 at the wide-angle end satisfy: 1 ​​< EFL1 / EFL2 ≤ 1.9.

[0214] By constraining the ratio range between EFL1 and EFL2, the optical lens 310 can have a larger zoom range, which improves the zoom ratio of the optical lens 310 and is beneficial to improving image quality. In addition, the larger zoom ratio of the optical lens 310 enables an integrated structural design, allowing a single optical lens to perform the functions of multiple traditional lenses (such as a main lens and a wide-angle lens).

[0215] In some embodiments, the effective focal length EFL1 of the optical lens 310 at the main camera end satisfies: 8.0≤EFL1≤9.0.

[0216] In some embodiments, the effective focal length EFL2 of the optical lens 310 at the wide-angle end satisfies: 6.0≤EFL1≤7.0.

[0217] In some embodiments, reference Figure 4 or Figure 5 The total optical length TTL2 of the optical lens 310 at the wide-angle end and the total optical length TTL1 of the optical lens 310 at the main camera end satisfy: TTL2 / TTL1≤1.5.

[0218] By constraining the ratio range between the total optical length TTL2 of the optical lens 310 at the wide-angle end and the total optical length TTL1 of the optical lens 310 at the main camera end, the optical lens 310 has a small total optical length throughout the zoom range, which can reduce space requirements while ensuring zoom requirements.

[0219] In some embodiments, reference Figure 4 or Figure 5 The aperture value F1# of the optical lens 310 at the main camera end and the aperture value F2# of the optical lens 310 at the wide-angle end satisfy: 0≤|F1# / F2#|≤0.8.

[0220] By constraining the ratio range between F1# and F2#, the optical lens 310 can have a larger aperture during zooming, which is beneficial to increasing the amount of light entering the optical lens 310 during zooming and thus improving image quality.

[0221] In some embodiments, the aperture value F1# of the optical lens 310 at the main camera end satisfies: 1.4≤F1#≤2.

[0222] In some embodiments, the aperture value F2# of the optical lens 310 at the wide-angle end satisfies: 2≤F2#≤4.

[0223] In some embodiments, reference Figure 4 or Figure 5 The optical power of the last lens 316 in the optical lens 310 is negative.

[0224] It can be understood that if the third lens group G3 is the last lens group of the optical lens 310, then the last lens 316 in the optical lens 310 is also the last lens in the third lens group G3. If the optical lens 310 also includes other lens groups located after the third lens group G3, then the last lens 316 in the optical lens 310 is the last lens in the last lens group of the optical lens 310.

[0225] The last lens 316 in the optical lens 310 has negative optical power and a diverging effect on light, which can further increase the size of the imaging target surface, thereby improving image quality.

[0226] In some embodiments, reference Figure 4 or Figure 5 The focal length f3 of the last lens 316 in the optical lens 310 and the effective focal length EFL2 of the optical lens 310 at the wide-angle end satisfy: 0.5≤|f3 / EFL2|≤20.

[0227] f3 and EFL2 satisfy the above relationship. By allocating the optical power, the distortion at the edge of the system can be improved at the wide-angle end of the optical lens 310, thereby improving image quality.

[0228] In some embodiments, the third lens group G3 has optical power, meaning that the third lens group G3 can converge or diverge light. For example, the third lens group G3 has positive optical power or negative optical power.

[0229] In some embodiments, the third lens group G3 is the last lens group in the optical lens 310, that is, the third lens group G3 is the lens group closest to the photosensitive element 320 among the multiple lens groups included in the optical lens 310.

[0230] In some embodiments, the number of lenses in the first lens group G1 is greater than or equal to 1.

[0231] In some embodiments, the number of lenses in the second lens group G2 is greater than or equal to 2.

[0232] In some embodiments, the number of lenses in the third lens group G3 is greater than or equal to 1.

[0233] In some embodiments, the field of view (FOV) of the optical lens 310 is greater than or equal to 78° and less than or equal to 107°. For example, the field of view (FOV) of the optical lens 310 is less than or equal to 100°.

[0234] In this embodiment, the position of the first focusing lens 311 can be selected according to actual needs. For example, the first focusing lens 311 can be located near the object side in the first lens group G1, or near the second lens group G2 in the first lens group G1, or among other lenses included in the first lens group G1.

[0235] In some embodiments, reference Figure 4 or Figure 5 The first focusing lens 311 is the lens closest to the object side in the first lens group G1, that is, the first lens in the first lens group G1 starting from the object side.

[0236] The first focusing lens 311 is located at the front end of the optical lens 310, which provides ample space for the optical power variation of the first focusing lens 311 and facilitates the design of the driving components that are matched with the first focusing lens 311.

[0237] In some embodiments, reference Figure 5 or Figure 4 The first focusing lens 311 can be a liquid lens.

[0238] A liquid lens is a variable curvature lens, specifically a mechanically disconnected optical element made of one or more optical-grade liquids, whose internal parameters can be changed via external control. The focal length of a liquid lens can be rapidly adjusted by altering the shape of the liquid. Optical-grade liquids possess high transparency and a low rate of refractive index change. For example, the liquid medium in a liquid lens can be mercury, silicone oil, liquid crystal, etc.

[0239] Using a liquid lens as the focusing lens enables rapid and smooth focal length changes, and provides a wide zoom range, thereby improving the zoom ratio of the optical lens.

[0240] For example, the first focusing lens 311 can be a graded refractive index lens, a liquid-filled lens, or an electrowetting effect lens.

[0241] The liquid medium in a graded refractive index lens is liquid crystal. By changing the voltage applied to the liquid crystal, the refractive index of the liquid crystal can be adjusted, thereby achieving the focal length adjustment of the lens.

[0242] Liquid-filled lenses are lenses that achieve focal length by changing the curvature of their surface through the filling and extraction of liquid. Mechanical devices apply pressure to the liquid within the cavity, causing it to redistribute and alter its radius of curvature. For example, a high-refractive-index optical liquid is sealed in an elastic film made of a flexible polymer. Electromagnetic drive is used to compress or relax the annular film layer distributed on the sides. Since the volume of the sealed liquid remains constant, when compressed, the liquid is forced from the sides into the central aperture, reducing the radius of curvature and thus the focal length; conversely, when the annular film layer on the sides is relaxed, the optical liquid diffuses out of the aperture, increasing the radius of curvature and thus the focal length.

[0243] Electrowetting effect lenses are liquid lenses that control the wetting properties of a liquid on a solid surface by changing the applied voltage. The electrowetting effect is a physicochemical phenomenon that controls the wetting properties of a liquid on a solid surface by changing the applied voltage at the liquid-solid interface. This alters the contact angle of the droplet, allowing it to change its curvature like the lens of the human eye to achieve zoom. For example, a liquid lens can be composed of two immiscible fluids (e.g., a conductive liquid and a non-conductive oil) with the same density but different refractive indices. Because the fluids are immiscible, they form a smooth and curved interface. By applying a voltage to the conductive liquid to change the way the two liquid surfaces interact, the radius of curvature of the interface can be altered, thus achieving zoom.

[0244] In some embodiments, the optical power of the first focusing lens 311 can be changed by mechanical or electrical actuation. Mechanical actuation alters the curvature or refractive index of the liquid medium by adjusting the pressure in the lens cavity or changing the external environment. Electrical actuation primarily changes the shape and focal length of the liquid lens by applying current or voltage, such as electrowetting technology or electrostatic actuation.

[0245] In some embodiments, reference Figure 5 When the optical lens 310 includes a second focusing lens 312, the second focusing lens 312 can be a liquid lens, such as a graduated refractive index lens, a liquid-filled lens, or an electrowetting effect lens. Exemplarily, the optical power of the second focusing lens 312 can be changed by mechanical or electrical actuation.

[0246] The type, driving method, optical parameters, etc. of the first focusing lens 311 and the second focusing lens 312 can be the same or different. The specific design can be made according to actual needs, and this application does not impose any special limitations on this.

[0247] In some embodiments, reference Figure 5 or Figure 4The first focusing lens 311 can be a variable-surface-shape lens, meaning its focal length (or optical power) can be changed by altering its surface shape. For example, the object-side and / or image-side surfaces of the first focusing lens 311 are variable-surface-shape surfaces. In this application, a variable-surface-shape surface is a surface capable of changing curvature (i.e., shape).

[0248] In some embodiments, reference Figure 5 The second focusing lens 312 can be a variable surface type lens, meaning that its focal length (or optical power) can be changed by altering its surface type. For example, the object-side and / or image-side surfaces of the second focusing lens 312 are variable surface type surfaces.

[0249] The first focusing lens 311 and / or the second focusing lens 312 are variable surface type lenses, which can change the optical power of the lens by changing the surface type. The corresponding driving structure is simple and can quickly achieve smooth focal length changes, thereby improving the performance and flexibility of the optical system.

[0250] In some embodiments, camera module 300 or camera module 400 may include a first detection sensor (not shown) for detecting changes in the shape and focal length of the first focusing lens 311 and converting them into electrical signals.

[0251] In some embodiments, camera module 300 or camera module 400 may include a first signal processing circuit (not shown in the figure), which processes the signal output by the first detection sensor and transmits it to the control circuit, thereby realizing real-time monitoring and control of the first focusing lens 311.

[0252] In some embodiments, when the optical lens 310 includes a second focusing lens 312, the camera module 400 may include a second detection sensor (not shown) for detecting changes in the shape and focal length of the second focusing lens 312 and converting them into electrical signals.

[0253] In some embodiments, when the optical lens 310 includes a second focusing lens 312, the camera module 400 may include a second signal processing circuit (not shown in the figure) for processing the signal output by the second detection sensor and transmitting it to the control circuit, thereby realizing real-time monitoring and control of the second focusing lens 312.

[0254] In some embodiments, reference Figure 2 or Figure 4When the optical lens 310 includes a movable lens group (e.g., a first lens group G1, a second lens group G2, or a third lens group G3), the camera module 300 or camera module 400 also includes a motor (not shown) for driving the movable lens group in the optical lens 310 to move, thereby achieving optical zoom. For example, this motor could be... Figure 5 An example of a zoom motor involved in the process.

[0255] It is understood that if the optical lens 310 includes multiple moving lens groups, the camera module 300 or camera module 400 may include multiple motors, each corresponding to one of the multiple moving lens groups, with each motor used to drive the movement of one of the moving lens groups. Alternatively, the camera module 300 or camera module 400 may include a single motor, which can be used to drive the multiple moving lens groups to move separately.

[0256] In some embodiments, camera module 300 or camera module 400 may include a prism or reflector (not shown) for changing the direction of the light path, so that the light after passing through the prism or reflector can propagate along the extension direction of the optical axis of optical lens 310. Accordingly, camera module 300 or camera module 400 is a foldable module.

[0257] The placement of prisms or mirrors can fold the optical path, further reducing the overall optical length of the module and thus reducing the space occupied by the module.

[0258] In some embodiments, the optical lens 310 in the camera module 300 or camera module 400 may further include more lens groups, such as a fourth lens group. The position of the fourth lens group may be after the third lens group G3, between the first lens group G1 and the third lens group G3, or before the first lens group G1. The specific design can be based on actual needs, and this application does not impose any special limitations on it. In addition, the fourth lens group may be a movable lens group or a fixed lens group, and the specific design can be based on actual needs, and this application also does not impose any special limitations on it.

[0259] In some embodiments, the first focusing lens 311 may protrude towards the object side or towards the image side when it is at the main camera end, and may protrude towards the object side or towards the image side when it is at the wide-angle end. The specific design can be made according to actual needs and is not specifically limited here.

[0260] In some embodiments, during the process of switching the optical lens 310 from the main camera end to the wide-angle end, the optical power of the first focusing lens 311 changes from large to small, or from small to large.

[0261] In some embodiments, the second focusing lens 312 may protrude towards the object side or towards the image side when it is at the main camera end, and may protrude towards the object side or towards the image side when it is at the wide-angle end. The specific design can be made according to actual needs and is not specifically limited here.

[0262] In some embodiments, during the process of switching the optical lens 310 from the main camera end to the wide-angle end, the optical power of the second focusing lens 312 changes from large to small, or from small to large.

[0263] In some embodiments, when the optical lens 310 includes a movable lens group, the direction of movement of each movable lens group during optical zoom can be designed according to actual needs, such as moving towards the object side, or moving towards the image side, or remaining stationary, etc., without special limitation.

[0264] For example, and not as a limitation, see reference. Figure 4 If the first lens group G1 and the second lens group G2 are moving lens groups and the third lens group G3 is a fixed lens group, then when the optical lens 310 switches from the non-working state to the main camera end, both the first lens group G1 and the second lens group G2 move to the object side. When the optical lens 310 switches from the non-working state to the wide-angle end, both the first lens group G1 and the second lens group G2 move to the object side.

[0265] For example, and not as a limitation, see reference. Figure 5 If the first lens group G1 is a movable lens group, and the second lens group G2 and the third lens group G3 are fixed lens groups, then when the optical lens 310 switches from the non-working state to the main camera end, the first lens group G1 moves towards the object side, and when the optical lens 310 switches from the non-working state to the wide-angle end, the first lens group G1 moves towards the image side.

[0266] It should be noted that the movable lens group involved in this application can be understood as a lens group that can move during optical zoom, and is not limited to moving when zooming to any focal length. In some cases, a movable lens group can remain stationary relative to its initial position when zooming to a specific focal length. The fixed lens group involved in this application can be understood as a lens group that does not move during optical zoom.

[0267] In some embodiments, the optical lens 310 in the camera module 300 or camera module 400 may further include more focusing lenses, such as a third focusing lens, which may be disposed in any lens group. For example, the first lens group G1, the second lens group G2, or the third lens group G3 may include a third focusing lens. The third focusing lens may be a liquid lens, such as a graduated refractive index lens, a liquid-filled lens, or an electrowetting effect lens. Exemplarily, the optical power of the third focusing lens may be changed by mechanical or electrical actuation. In some embodiments, the third focusing lens may be a variable surface area lens.

[0268] By adding more focusing lenses, the space requirement can be further reduced while still meeting zoom needs.

[0269] In this embodiment, apart from lenses with variable optical power (such as the first focusing lens 311 and the second focusing lens 312), the other lenses in the optical lens 310 are lenses with constant optical power, such as solid lenses. For example, the material of the solid lens can be glass or plastic, etc., and this application does not make any special limitation on it.

[0270] In this embodiment, a lens in the optical lens 310 (e.g., a lens with variable optical power or a lens with constant optical power) can be a spherical lens or an aspherical lens, which can be designed according to actual needs and is not specifically limited here. The curvature of an aspherical lens varies from its center to its edge. Compared to a spherical lens with constant curvature, an aspherical lens has better curvature radius characteristics and adjustability, which helps reduce spherical aberration, improve focusing level, and improve distortion aberration and chromatic aberration, thereby improving image quality. Furthermore, aspherical lenses can reduce the total number of lenses required to obtain a given result, and also help reduce the overall weight and axial dimensions of the lens.

[0271] In some embodiments, reference Figure 2 or Figures 6 to 21 The camera module 300 or camera module 400 may also include a filter 330 for transmitting light of a preset wavelength. The filter 330 can filter out light beams of a specified wavelength, thereby highlighting light beams of other wavelengths and making the image more vivid.

[0272] For example, filter 330 can be used for visible light and / or infrared light to pass through. For instance, filter 330 can be an infrared cut-off filter to filter out infrared light, thereby reducing image distortion (e.g., color cast) caused by infrared light and improving the realism of image colors. Alternatively, filter 330 can be a monochromatic filter to increase the amount of light entering the camera, thereby improving the performance of the camera module in low-light scenarios.

[0273] In some embodiments, the filter 330 may be disposed between the optical lens 310 and the photosensitive element 320; or disposed between two lens groups in the optical lens 310, such as between the first lens group G1 and the second lens group G2, or between the second lens group G2 and the third lens group G3; or disposed between two lenses in a certain lens group, such as disposed between the lenses included in the first lens group G1 / second lens group G2 / third lens group G3. The placement position of the filter 330 can be designed according to actual needs and is not specifically limited here.

[0274] In some embodiments, the filter 330 can be a hard film filter, and correspondingly, the filter 330 can be provided independently. Alternatively, the filter 330 can be a soft film filter, and correspondingly, the filter 330 can be attached to other optical elements (such as lenses, photosensitive elements, apertures, etc.). The form of the filter 330 can be designed according to actual needs, and no special limitation is made here.

[0275] For example, filter 330 can be as follows: Figure 6 An example of filter 241 shown.

[0276] It should be noted that the camera module 300 or 400 provided in this application can perform continuous zoom when performing optical zoom.

[0277] In this embodiment, each lens included in the optical lens 310 comprises two opposing surfaces, at least one of which is a lens surface. The lens surface is a curved surface that protrudes or recedes along the optical axis of the zoom lens, and can participate in imaging and aberration correction. Specifically, light entering the lens is refracted on the lens surface, and its path is altered due to the curved shape of the lens surface. By changing the path of the incident light through the lens surface, the incident light can be made to converge or diverge accordingly, thus participating in imaging. Through the sequential divergence or convergence of the incident light by multiple lens surfaces in the zoom lens, optical imaging can be achieved. The lens surface can be spherical or aspherical.

[0278] To facilitate understanding, the following will be combined with Figure 6 The present application provides more detailed descriptions of specific, but not limiting, examples of embodiments thereof, along with optical parameter data and simulation results.

[0279] Figure 4 A schematic diagram of the architecture of a camera module provided in an embodiment of this application is shown. Figure 6 The camera module 510 shown can be Figure 6 One possible design of the camera module 300 shown. Figure 6 (a) in the diagram is a schematic diagram of the camera module 510 in its initial state (i.e., non-working state). Figure 6 (b) is a schematic diagram of the camera module 510 in the main camera position. Figure 4 (c) in the diagram is a schematic diagram of the camera module 510 at the wide-angle end.

[0280] refer to Figure 6The camera module 510 includes an optical lens 310, a filter 330, and a photosensitive element 320 arranged sequentially along the direction of incident light propagation. The optical lens 310 includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially along the optical axis from the object side to the image side. The first lens group G1 includes a first lens L1; the second lens group G2 includes a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6; and the third lens group G3 includes a seventh lens L7 and an eighth lens L8. The optical power of the first lens L1 is variable. Figure 7 A specific example of the first focusing lens 311 in the diagram. The first lens group G1 and the second lens group G2 are movable lens groups that can move along the optical axis. The third lens group G3 is a fixed lens group that does not move along the optical axis.

[0281] For example, when moving from the initial state to the main camera position, the first lens group G1 and the second lens group G2 move towards the object side, while the third lens group G3 remains fixed. When moving from the initial state to the wide-angle position, the first lens group G1 and the second lens group G2 move towards the object side, while the third lens group G3 remains fixed.

[0282] The following is a description based on Tables 1 to 3. Figure 6 The relevant parameters of the camera module 510 shown are as follows.

[0283] Table 1 below shows the basic optical parameters of the camera module 510.

[0284] Table 1

[0285]

[0286] As shown in Table 1, the values ​​of each conditional expression in this embodiment are all within the aforementioned setting range.

[0287] Table 2 below shows the specific parameters of each optical element of the camera module 510, where the units of radius of curvature R and thickness T are millimeters (mm).

[0288] Table 2

[0289]

[0290] The meanings of the symbols in Table 2 are as follows.

[0291] STO: Optical stop;

[0292] L1R1: The object-side surface of the first lens L1;

[0293] L1R2: The image-side surface of the first lens L1;

[0294] L2R1: The object-side surface of the second lens L2;

[0295] L2R2: The image-side surface of the second lens L2;

[0296] L3R1: Object-side surface of the third lens L3;

[0297] L3R2: The image-side view of the third lens L3;

[0298] L4R1: The object-side surface of the fourth lens L4;

[0299] L4R2: The image side of the fourth lens L4;

[0300] L5R1: The object-side surface of the fifth lens L5;

[0301] L5R2: The image side of the fifth lens L5;

[0302] L6R1: The object-side surface of the sixth lens L6;

[0303] L6R2: The image-side surface of the sixth lens L6;

[0304] L7R1: The object-side surface of the seventh lens L7;

[0305] L7R2: The image side of the seventh lens L7;

[0306] L8R1: The object-side surface of the eighth lens L8;

[0307] L8R2: The image-side view of the eighth lens L8;

[0308] IR1: Object-side surface of filter 330;

[0309] IR2: Image side view of filter 330;

[0310] R: The radius of curvature of the optical surface. A positive value indicates that the optical surface bulges towards the object side near the optical axis, while a negative value indicates that the optical surface bulges towards the image side near the optical axis. A value of 1.00E+18 indicates that the radius of curvature of the optical surface is infinite (infinity, inf), that is, the optical surface is a plane.

[0311] T: The on-axis thickness of an optical element (such as a lens, aperture, filter, etc.) or the on-axis distance between optical elements. For example, the thickness value corresponding to the object side of an optical element is the on-axis thickness of that optical element, and the thickness value corresponding to the image side of an optical element is the on-axis distance between that optical element and the next optical element, specifically the on-axis distance between the image side of that optical element and the object side of the next optical element.

[0312] BK7: This is the glass grade of SCHOTT.

[0313] In some embodiments, the even-order aspherical surface shape z in the camera module 510 can be expressed using, but is not limited to, the following aspherical curve formula:

[0314]

[0315] Where z is the aspherical surface's sag, specifically the distance sag from the vertex of the aspherical surface at a height of r along the optical axis; r is the radial coordinate of the aspherical surface; c is the paraxial curvature of the aspherical surface, equal to the reciprocal of its radius; k is the conic coefficient; A i Let A2, A4, A6, A8, ... be the aspherical coefficients of order i. 、 A 30 These represent the aspheric coefficients of the 2nd, 4th, 6th, 8th, ..., 30th orders, respectively.

[0316] Table 3 below shows the aspherical coefficients corresponding to the surfaces of each optical element of the camera module 510, where the conic coefficient k is 0, and the 28th and 30th order aspherical coefficients are also 0.

[0317] Table 3

[0318]

[0319] It should be noted that the aspheric coefficients in Table 3 are expressed in scientific notation, for example, 3.56E-03 = 3.56 × 10⁻⁶. -3 -2.52E+00 = -2.52 × 10 0 .

[0320] Figure 7 It shows Figure 7 A schematic diagram of the modulation transfer function (MTF) curve of the camera module 510. Among them, Figure 7 (a) shows a schematic diagram of the MTF curve of the camera module 510 at the main camera end. Figure 7 (b) shows a schematic diagram of the MTF curve of the camera module 510 at the wide-angle end. Figure 7 As shown, the horizontal axis represents the field of view in degrees (°), indicating the distance from the image center. The horizontal axis from left to right represents the imaging from the center to the edge. The vertical axis represents the MTF value, i.e., modulation contrast; the larger the number, the better the lens performance. SAG represents the sagittal direction, and TAN represents the meridional direction.

[0321] refer to Figure 8In (a) of the diagram, when the camera module 510 is at the main camera end, under different fields of view, the MTF curves with a spatial frequency of 80 lp / mm are greater than 0.25 in both the sagittal and meridional directions. Furthermore, within the effective field of view (approximately 0°-38°), the MTF values ​​are greater than 0.4 in both the sagittal and meridional directions, indicating that the camera module 510 can achieve high-quality imaging at the object distance corresponding to the main camera end. Additionally, within the effective field of view, the MTF curve with a spatial frequency of 80 lp / mm decreases gently from left to right, indicating that when the camera module 510 is at the main camera end, the imaging difference between the lens center and the lens edge is small, and the consistency between the lens edge and the lens center is good. At a spatial frequency of 80 lp / mm, the MTF curves in the SAG direction and the TAN direction are close, indicating that the field curvature of the camera module 510 at the main camera end is small, providing clear imaging. The MTF curve with a spatial frequency of 80 lp / mm is close to the diffraction-limited MTF curve in both the sagittal and meridional directions, indicating that the imaging quality of the camera module 510 at the main camera end is high and the difference from the ideal imaging quality is small.

[0322] refer to Figure 6 In (b), at the wide-angle end, the MTF curves of the camera module 510 with a spatial frequency of 80 lp / mm are greater than 0.2 in both the sagittal and meridional directions under different fields of view. Furthermore, within the effective field of view (approximately 0°-38°), the MTF values ​​are greater than 0.6 in both the sagittal and meridional directions, indicating that the camera module 510 can achieve high-quality macro imaging at the object distance corresponding to the wide-angle end. Additionally, within the effective field of view, the MTF curve with a spatial frequency of 80 lp / mm decreases gently from left to right, indicating that the imaging gap between the lens center and lens edge is small at the wide-angle end, and the consistency between the lens edge and lens center is good. At a spatial frequency of 80 lp / mm, the MTF curves in the SAG direction and the TAN direction are close, indicating that the field curvature of the camera module 510 is small at the wide-angle end, providing clear imaging. The MTF curve with a spatial frequency of 80 lp / mm is close to the diffraction-limited MTF curve in both the sagittal and meridional directions, indicating that the camera module 510 has high imaging quality at the wide-angle end and the difference from the ideal imaging quality is small.

[0323] It should be noted that the testing frequency of the MTF curve is related to the image sensor. For image sensors with large target surfaces, the testing frequency per inch is usually 80 lp / mm.

[0324] Figure 8 It shows Figure 8 A schematic diagram of the distortion curve of the camera module 510. Among them, Figure 8 (a) shows a schematic diagram of the distortion curve of the camera module 510 at the main camera end.Figure 8 (b) shows a schematic diagram of the distortion curve of the camera module 510 at the wide-angle end. Figure 8 As shown, the horizontal axis represents distortion, and the vertical axis represents the field of view. The distortion curve represents the difference between the image deformation and the ideal shape.

[0325] Depend on Figure 9 As shown in (a), when the camera module 510 is at the main camera end, the maximum deviation between the distortion curve and the vertical axis is about 2.5%. Therefore, the camera module 510 can control the distortion within 3% at the main camera end, reduce distortion, and improve image quality.

[0326] Depend on Figure 6 As shown in (b), when the camera module 510 is at the wide-angle end, the maximum deviation between the distortion curve and the vertical axis is about 8%. Therefore, the camera module 510 can control the distortion within 8% at the wide-angle end, which is beneficial to improving the image quality.

[0327] In addition, the imaging characteristics of the 510 camera module are relatively similar at the wide-angle end and the main camera end, and the lens is highly stable during focusing.

[0328] Figure 9 It shows Figure 9 A schematic diagram of the imaging optical path of the camera module 510. Among them, Figure 9 (a) shows a schematic diagram of the imaging optical path of the camera module 510 at the main camera end. Figure 10 (b) shows a schematic diagram of the imaging optical path of the camera module 510 at the wide-angle end. Figure 10 As can be seen from (a) and (b) in the figure, the half-image height of the camera module 510 at the main camera end is basically equal to that at the wide-angle end. In this way, a clear image with high resolution can be obtained regardless of the focal length.

[0329] Figure 4 A schematic diagram of the architecture of a camera module provided in an embodiment of this application is shown. Figure 10 The camera module 520 shown can be Figure 10 One possible design of the camera module 300 shown. Figure 10 (a) in the diagram is a schematic diagram of the camera module 520 in its initial state (i.e., non-working state). Figure 10 (b) is a schematic diagram of the camera module 520 in the main camera position. Figure 4 (c) in the diagram is a schematic diagram of the camera module 520 at the wide-angle end.

[0330] refer to Figure 10The camera module 520 includes an optical lens 310, a filter 330, and a photosensitive element 320 arranged sequentially along the direction of incident light propagation. The optical lens 310 includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially along the optical axis from the object side to the image side. The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6; the second lens group G2 includes a seventh lens L7, an eighth lens L8, and a ninth lens L9; and the third lens group G3 includes a tenth lens L10. The optical power of the first lens L1 is variable. Figure 11 A specific example of the first focusing lens 311 in the diagram. The first lens group G1 and the second lens group G2 are movable lens groups that can move along the optical axis. The third lens group G3 is a fixed lens group that does not move along the optical axis.

[0331] For example, when moving from the initial state to the main camera end, the first lens group G1 and the second lens group G2 move towards the object side, while the third lens group G3 remains fixed. When moving from the initial state to the wide-angle end, the first lens group G1 moves towards the image side, the second lens group G2 remains stationary, and the third lens group G3 remains fixed. It can be understood that in this embodiment, the initial state of the optical lens is at the wide-angle end, and when moving from the initial state to the wide-angle end, the distance that the first lens group G1 moves towards the image side is very small; it can also be considered that the first lens group G1 remains stationary.

[0332] The following is a description based on Tables 4 to 6. Figure 10 The parameters of the camera module 520 shown are as follows.

[0333] Table 4 below shows the basic optical parameters of the camera module 520.

[0334] Table 4

[0335]

[0336]

[0337] As shown in Table 4, the values ​​of each conditional expression in this embodiment are all within the aforementioned setting range.

[0338] Table 5 below shows the specific parameters of each optical element of the camera module 520, where the units of radius of curvature R and thickness T are millimeters (mm).

[0339] Table 5

[0340]

[0341]

[0342] The meanings of the symbols in Table 5 are referenced in Table 2. The meanings of symbols not covered in Table 2 are supplemented below.

[0343] L9R1: The object-side surface of the ninth lens L9;

[0344] L9R2: The image side of the ninth lens L9;

[0345] L10R1: The object-side surface of the tenth lens L10;

[0346] L10R2: The image side of the tenth lens L10;

[0347] In some embodiments, the even-order aspherical surface shape z in the camera module 520 can be expressed using formula (1). As shown in Table 6 below, the aspherical coefficients corresponding to the surfaces of each optical element of the camera module 520 are displayed, where the conic coefficient k is 0.

[0348] Table 6

[0349]

[0350] Figure 11 It shows Figure 11 A schematic diagram of the modulation transfer function (MTF) curve of the camera module 520. Among them, Figure 11 (a) shows a schematic diagram of the MTF curve of the camera module 520 at the main camera end. Figure 11 (b) shows a schematic diagram of the MTF curve of the camera module 520 at the wide-angle end. Figure 11 As shown, the horizontal axis represents the field of view angle in degrees (°); the vertical axis represents the MTF value.

[0351] refer to Figure 12 In (a) of the diagram, when the camera module 520 is at the main camera end, the MTF curves with a spatial frequency of 80 lp / mm are greater than 0.4 in both the sagittal and meridional directions under different fields of view, indicating that the camera module 520 can achieve high-quality imaging at the object distance corresponding to the main camera end. Furthermore, the MTF curve with a spatial frequency of 80 lp / mm decreases gently from left to right with a slight rebound in some areas, indicating that the imaging gap from the lens center to the lens edge is small when the camera module 520 is at the main camera end, and the consistency between the lens edge and the lens center is good. At a spatial frequency of 80 lp / mm, the MTF curves in the SAG direction and the TAN direction are close, indicating that the field curvature of the camera module 520 at the main camera end is small, providing a clear image.

[0352] refer to Figure 10In (b) of the diagram, at the wide-angle end, the MTF curves of the camera module 520 with a spatial frequency of 80 lp / mm are greater than 0.3 in both the sagittal and meridional directions under different fields of view. Furthermore, within the effective field of view (approximately 0°-38°), the MTF values ​​are greater than 0.4 in both the sagittal and meridional directions. This indicates that the camera module 520 can achieve high-quality macro imaging at the object distance corresponding to the wide-angle end. Additionally, the MTF curve with a spatial frequency of 80 lp / mm decreases gently from left to right with a slight rebound in some areas, indicating that the imaging gap between the lens center and lens edge is small at the wide-angle end, and the consistency between the lens edge and lens center is good. At a spatial frequency of 80 lp / mm, the MTF curves in the SAG direction and the TAN direction are close, indicating that the field curvature of the camera module 520 is small at the wide-angle end, providing clear imaging.

[0353] Figure 12 It shows Figure 12 A schematic diagram of the distortion curve of the camera module 520 in the image. Figure 12 (a) shows a schematic diagram of the distortion curve of the camera module 520 at the main camera end. Figure 12 (b) shows a schematic diagram of the distortion curve of the camera module 520 at the wide-angle end. Figure 12 As shown, the horizontal axis represents distortion, and the vertical axis represents the field of view.

[0354] Depend on Figure 13 As shown in (a), when the camera module 520 is at the main camera end, the maximum deviation between the distortion curve and the vertical axis is about 3% within the full field of view (i.e., the effective field of view). Therefore, the camera module 520 can control the distortion to within 3% at the main camera end, reduce distortion, and improve image quality.

[0355] Depend on Figure 10 As shown in (b), when the camera module 520 is at the wide-angle end, the maximum deviation between the distortion curve and the vertical axis is about 5% within the entire field of view (i.e., the effective field of view). Therefore, the camera module 520 can control the distortion to within 5% at the wide-angle end, which is beneficial to improving the image quality.

[0356] In addition, the imaging characteristics of the 520 camera module are similar at the wide-angle end and the main camera end, and the lens is highly stable during focusing.

[0357] Figure 13 It shows Figure 13 A schematic diagram of the imaging optical path of the camera module 520. Among them, Figure 13 (a) shows a schematic diagram of the imaging optical path of the camera module 520 at the main camera end. Figure 14 (b) shows a schematic diagram of the imaging optical path of the camera module 520 at the wide-angle end. Figure 14As shown in (a) and (b), the half-image height of the camera module 520 at the main camera end is basically equal to that at the wide-angle end. This ensures that a clear image with high resolution can be obtained regardless of the focal length.

[0358] Figure 5 A schematic diagram of the architecture of a camera module provided in an embodiment of this application is shown. Figure 14 The camera module 530 shown can be Figure 14 One possible design of the camera module 400 shown. Figure 14 (a) in the diagram is a schematic diagram of the camera module 530 in its initial state (i.e., non-working state). Figure 14 (b) is a schematic diagram of the camera module 530 in the main camera position. Figure 5 (c) in the diagram is a schematic diagram of the camera module 530 at the wide-angle end.

[0359] refer to Figure 5 The camera module 530 includes an optical lens 310, a filter 330, and a photosensitive element 320 arranged sequentially along the direction of incident light propagation. The optical lens 310 includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially along the optical axis from the object side to the image side. The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6; the second lens group G2 includes a seventh lens L7, an eighth lens L8, and a ninth lens L9; and the third lens group G3 includes a tenth lens L10. The optical power of the first lens L1 is variable. Figure 14 A specific example of the first focusing lens 311. The seventh lens L7 has variable optical power, which is... Figure 15 A specific example of the second focusing lens 312 in the example. The first lens group G1 is a movable lens group that can move along the optical axis. The second lens group G2 and the third lens group G3 are fixed lens groups that do not move along the optical axis.

[0360] For example, when moving from the initial state to the main camera end, the first lens group G1 moves towards the object side, while the second lens group G2 and the third lens group G3 remain fixed. When moving from the initial state to the wide-angle end, the first lens group G1 moves towards the image side, while the second lens group G2 and the third lens group G3 remain fixed. It can be understood that in this embodiment, the initial state of the optical lens is at the wide-angle end, and when moving from the initial state to the wide-angle end, the distance that the first lens group G1 moves towards the image side is very small; it can also be considered that the first lens group G1 remains stationary.

[0361] The following is a description based on Tables 7 to 9. Figure 14 The parameters of the camera module 530 shown are as follows.

[0362] Table 7 below shows the basic optical parameters of the camera module 530.

[0363] Table 7

[0364]

[0365] As shown in Table 7, the values ​​of each conditional expression in this embodiment are all within the aforementioned setting range.

[0366] Table 8 below shows the specific parameters of each optical element of the camera module 530, where the units for radius of curvature R and thickness T are millimeters (mm). The meanings of the symbols in Table 8 can be found in Tables 2 and 5.

[0367] Table 8

[0368]

[0369]

[0370] In some embodiments, the even-order aspherical surface shape z in the camera module 530 can be defined using formula (1). As shown in Table 9 below, the aspherical coefficients corresponding to the surfaces of each optical element of the camera module 530 are as follows, where the conic coefficient k is 0, and the aspherical coefficients of the 20th, 22nd, 24th, 26th, 28th and 30th orders are also 0.

[0371] Table 9

[0372]

[0373] Figure 15 It shows Figure 15 A schematic diagram of the modulation transfer function (MTF) curve of the camera module 530. Among them, Figure 15 (a) shows a schematic diagram of the MTF curve of the camera module 530 at the main camera end. Figure 15 (b) shows a schematic diagram of the MTF curve of the camera module 530 at the wide-angle end. Figure 15 As shown, the horizontal axis represents the image height in millimeters (mm), indicating the distance from the image center. The horizontal axis from left to right represents the image from the center to the edge. The vertical axis represents the MTF value.

[0374] refer to Figure 16In (a) of the diagram, when the camera module 530 is at the main camera end, under different fields of view, the MTF curves with a spatial frequency of 80 lp / mm are greater than 0.55 in both the sagittal and meridional directions. Furthermore, within the image height range of 0-6.5 mm, the MTF values ​​are greater than 0.65 in both the sagittal and meridional directions, indicating that the camera module 530 can achieve high-quality imaging at the object distance corresponding to the main camera end. Additionally, the MTF curve with a spatial frequency of 80 lp / mm decreases gently from left to right, indicating that when the camera module 530 is at the main camera end, the imaging difference between the lens center and the lens edge is small, and the consistency between the lens edge and the lens center is good. At a spatial frequency of 80 lp / mm, the MTF curves in the SAG direction and the TAN direction are close, indicating that the field curvature of the camera module 530 at the main camera end is small, providing clear imaging. The MTF curve with a spatial frequency of 80 lp / mm is close to the diffraction-limited MTF curve in both the sagittal and meridional directions, indicating that the imaging quality of the camera module 530 at the main camera end is high and the difference from the ideal imaging quality is small.

[0375] refer to Figure 14 In (b) of the diagram, at the wide-angle end, the MTF curves of the camera module 530 with a spatial frequency of 80 lp / mm are greater than 0.5 in both the sagittal and meridional directions under different fields of view. Furthermore, within the image height range of 0-6.5 mm, the MTF values ​​are greater than 0.6 in both the sagittal and meridional directions, indicating that the camera module 530 can achieve high-quality macro imaging at the corresponding object distance at the wide-angle end. Additionally, the MTF curve with a spatial frequency of 80 lp / mm decreases gently from left to right, indicating that the imaging gap between the lens center and lens edge is small at the wide-angle end, and the consistency between the lens edge and lens center is good. At a spatial frequency of 80 lp / mm, the MTF curves in the SAG direction and the TAN direction are close, indicating that the field curvature of the camera module 530 is small at the wide-angle end, providing clear imaging. The MTF curve with a spatial frequency of 80 lp / mm is close to the diffraction-limited MTF curve in both the sagittal and meridional directions, indicating that the 530 camera module has high imaging quality at the wide-angle end and the difference from the ideal imaging quality is small.

[0376] Figure 16 It shows Figure 16 A schematic diagram of the distortion curve of the camera module 530 in the image. Figure 16 (a) shows a schematic diagram of the distortion curve of the camera module 530 at the main camera end. Figure 16 (b) shows a schematic diagram of the distortion curve of the camera module 530 at the wide-angle end. Figure 16 As shown, the horizontal axis represents distortion, and the vertical axis represents the field of view.

[0377] Depend on Figure 17As shown in (a), when the camera module 530 is at the main camera end, the maximum deviation between the distortion curve and the vertical axis is about 2.3%. Therefore, the camera module 530 can control the distortion within 3% at the main camera end, reduce distortion, and improve image quality.

[0378] Depend on Figure 14 As shown in (b), when the camera module 530 is at the wide-angle end, the maximum deviation between the distortion curve and the vertical axis is about 3.5%. Therefore, the camera module 530 can control the distortion within 5% at the wide-angle end, which is beneficial to improving the image quality.

[0379] In addition, the imaging characteristics of the 530 camera module are relatively similar at the wide-angle end and the main camera end, and the lens is highly stable during focusing.

[0380] Figure 17 It shows Figure 17 A schematic diagram of the imaging optical path of the camera module 530. Among them, Figure 17 (a) shows a schematic diagram of the imaging optical path of the camera module 530 at the main camera end. Figure 18 (b) shows a schematic diagram of the imaging optical path of the camera module 530 at the wide-angle end. Figure 18 As shown in (a) and (b), the half-image height of the camera module 530 at the main camera end is basically equal to that at the wide-angle end. This ensures that a clear image with high resolution can be obtained regardless of the focal length.

[0381] Figure 5 A schematic diagram of the architecture of a camera module provided in an embodiment of this application is shown. Figure 18 The camera module 540 shown can be Figure 18 One possible design of the camera module 400 shown. Figure 18 (a) in the diagram is a schematic diagram of the camera module 540 in its initial state (i.e., non-working state). Figure 18 (b) is a schematic diagram of the camera module 540 in the main camera position. Figure 5 (c) in the diagram is a schematic diagram of the camera module 540 at the wide-angle end.

[0382] refer to Figure 5The camera module 540 includes an optical lens 310, a filter 330, and a photosensitive element 320 arranged sequentially along the direction of incident light propagation. The optical lens 310 includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially along the optical axis from the object side to the image side. The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6; the second lens group G2 includes a seventh lens L7, an eighth lens L8, and a ninth lens L9; and the third lens group G3 includes a tenth lens L10. The optical power of the first lens L1 is variable. Figure 18 A specific example of the first focusing lens 311. The seventh lens L7 has variable optical power, which is... Figure 19 A specific example of the second focusing lens 312 in the example. The first lens group, the second lens group G2, and the third lens group G3 are all fixed lens groups and do not move along the optical axis.

[0383] For example, when transitioning from the initial state to the main camera position, the first focusing lens 311 and the second focusing lens 312 change the optical power. When transitioning from the initial state to the wide-angle position, the first focusing lens 311 and the second focusing lens 312 change the optical power.

[0384] The following is a description based on Tables 10 to 12. Figure 18 The parameters of the camera module 540 shown are as follows.

[0385] Table 10 below shows the basic optical parameters of the camera module 540.

[0386] Table 10

[0387]

[0388]

[0389] As shown in Table 10, the values ​​of each conditional expression in this embodiment are all within the aforementioned setting range.

[0390] Table 11 below shows the specific parameters of each optical element of the camera module 540, where the units for radius of curvature R and thickness T are millimeters (mm). The meanings of the symbols in Table 11 can be found in Tables 2 and 5.

[0391] Table 11

[0392]

[0393] In some embodiments, the even-order aspherical surface shape z in the camera module 540 can be defined using formula (1). Table 12 below shows the aspherical coefficients corresponding to the surfaces of each optical element of the camera module 540, where the conic coefficient k is 0.

[0394] Table 12

[0395]

[0396] Figure 19 It shows Figure 19 A schematic diagram of the modulation transfer function (MTF) curve of the camera module 540. Among them, Figure 19 (a) shows a schematic diagram of the MTF curve of the camera module 540 at the main camera end. Figure 19 (b) shows a schematic diagram of the MTF curve of camera module 540 at the wide-angle end. Figure 19 As shown, the horizontal axis represents the field of view angle in degrees (°); the vertical axis represents the MTF value.

[0397] refer to Figure 20 In (a), when the camera module 540 is at the main camera end, the MTF curves with a spatial frequency of 80 lp / mm are greater than 0.5 in both the sagittal and meridional directions under different fields of view, indicating that the camera module 540 can achieve high-quality imaging at the object distance corresponding to the main camera end. Furthermore, the MTF curve with a spatial frequency of 80 lp / mm decreases gently from left to right, indicating that the imaging gap from the lens center to the lens edge is small when the camera module 540 is at the main camera end, and the consistency between the lens edge and the lens center is good. At a spatial frequency of 80 lp / mm, the MTF curves in the SAG direction and the TAN direction are close, indicating that the field curvature of the camera module 540 at the main camera end is small, providing clear imaging. The MTF curves with a spatial frequency of 80 lp / mm are close to the diffraction-limited MTF curves in both the sagittal and meridional directions, indicating that the imaging quality of the camera module 540 at the main camera end is high, and the difference from the ideal imaging quality is small.

[0398] refer to Figure 18In (b), at the wide-angle end, the MTF curves of the camera module 540 with a spatial frequency of 80 lp / mm are greater than 0.3 in both the sagittal and meridional directions under different fields of view. Furthermore, within the effective field of view of 0-38°, the MTF values ​​are greater than 0.45 in both the sagittal and meridional directions, indicating that the camera module 540 can achieve high-quality macro imaging at the corresponding object distance at the wide-angle end. Additionally, the MTF curve with a spatial frequency of 80 lp / mm decreases gently from left to right, indicating that the imaging gap between the lens center and lens edge is small at the wide-angle end, and the consistency between the lens edge and lens center is good. At a spatial frequency of 80 lp / mm, the MTF curves in the SAG direction and the TAN direction are close, indicating that the field curvature of the camera module 540 is small at the wide-angle end, providing clear imaging. The MTF curve with a spatial frequency of 80 lp / mm is close to the diffraction-limited MTF curve in both the sagittal and meridional directions, indicating that the 540 camera module has high imaging quality at the wide-angle end and the difference from the ideal imaging quality is small.

[0399] Figure 20 It shows Figure 20 A schematic diagram of the distortion curve of camera module 540 in the image. Figure 20 (a) shows a schematic diagram of the distortion curve of the camera module 540 at the main camera end. Figure 20 (b) shows a schematic diagram of the distortion curve of camera module 540 at the wide-angle end. Figure 20 As shown, the horizontal axis represents distortion, and the vertical axis represents the field of view / image height.

[0400] Depend on Figure 21 As shown in (a), when the camera module 540 is at the main camera end, the maximum deviation between the distortion curve and the vertical axis is about 2.5%. Therefore, the camera module 540 can control the distortion within 3% at the main camera end, reduce distortion, and improve image quality.

[0401] Depend on Figure 18 As shown in (b), when the camera module 540 is at the wide-angle end, the maximum deviation between the distortion curve and the vertical axis is about 2.5%. Therefore, the camera module 540 can control the distortion within 5% at the wide-angle end, which is beneficial to improving the image quality.

[0402] In addition, the imaging characteristics of the 540 camera module are relatively similar at the wide-angle end and the main camera end, and the lens is highly stable during focusing.

[0403] Figure 21 It shows Figure 21 A schematic diagram of the imaging optical path of the camera module 540. Among them, Figure 21 (a) shows a schematic diagram of the imaging optical path of the camera module 540 at the main camera end.​ (b) shows a schematic diagram of the imaging optical path of the camera module 540 at the wide-angle end. ​ As shown in (a) and (b), the half-image height of the camera module 540 at the main camera end is basically equal to that at the wide-angle end. This ensures that a clear image with high resolution can be obtained regardless of the focal length.

[0404] This application embodiment also provides an optical lens, which is the optical lens 310 described in the foregoing embodiment.

[0405] This application also provides an electronic device, which includes an image processor and a camera module as described in the foregoing embodiments, such as camera module 300 or 400, or more specifically, camera module 510, 520, 530 or 540. The image processor is communicatively connected to the camera module and is used to receive and process images acquired by the camera module.

[0406] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical lens, characterized in that, include: The first group of mirrors, the second group of mirrors, and the third group of mirrors are arranged sequentially from the object side to the image side along the optical axis; The first lens group includes a first focusing lens, the optical power of which is variable for optical zoom of the optical lens from the main camera end to the wide-angle end, wherein the optical power φ1 of the first focusing lens at the main camera end and the optical power φ2 of the first focusing lens at the wide-angle end satisfy: |φ1-φ2|≥0.01; At least two of the first lens group, the second lens group, and the third lens group are movable along the optical axis, or at least one of the first lens group, the second lens group, and the third lens group includes a second focusing lens with variable optical power for optical zoom of the optical lens from the main camera end to the wide-angle end.

2. The optical lens according to claim 1, characterized in that, The first and second mirror groups are movable along the optical axis, while the third mirror group is a fixed mirror group.

3. The optical lens according to claim 1, characterized in that, At least one of the first lens group, the second lens group, and the third lens group includes the second focusing lens, wherein, At least one of the first mirror group, the second mirror group, and the third mirror group is movable along the optical axis; or The first group of mirrors, the second group of mirrors, and the third group of mirrors are fixed groups of mirrors.

4. The optical lens according to claim 3, characterized in that, The first lens group includes the first focusing lens, the second lens group includes the second focusing lens, and both the second lens group and the third lens group are fixed lens groups; wherein... The first mirror group is movable along the optical axis, or the first mirror group is a fixed mirror group.

5. The optical lens according to any one of claims 1 to 4, characterized in that, The first focusing lens is the lens closest to the object side in the first lens group; and / or The second focusing lens is the lens in the second lens group that is closest to the first lens group.

6. The optical lens according to any one of claims 1 to 5, characterized in that, The effective focal length EFL2 of the optical lens at the wide-angle end and the corresponding half-image height IMH of the optical lens at the wide-angle end satisfy the following condition: 0.2≤EFL2 / IMH≤1.

0.

7. The optical lens according to any one of claims 1 to 6, characterized in that, The refractive index n of the first lens located on the object side in the second group of lenses satisfies: 1.2≤n≤2.

0.

8. The optical lens according to any one of claims 1 to 7, characterized in that, The pop-out travel H of the optical lens and the maximum total optical length TTL of the optical lens satisfy the following condition: 0≤H / TTL≤0.5, wherein the pop-out travel H of the optical lens is the difference between the maximum total optical length TTL of the optical lens and the total optical length TTL3 of the optical lens in the initial state.

9. The optical lens according to any one of claims 1 to 8, characterized in that, The optical lens also includes an aperture stop, and the focal length f1 of the first lens located on the object side in the second lens group at the main camera end and the focal length f2 of the first lens behind the aperture stop at the main camera end satisfy: |f1 / f2|≤10.

10. The optical lens according to any one of claims 1 to 9, characterized in that, The effective focal length EFL1 of the optical lens at the main camera end and the effective focal length EFL2 of the optical lens at the wide-angle end satisfy: 1 ​​< EFL1 / EFL2 ≤ 1.

9.

11. The optical lens according to any one of claims 1 to 10, characterized in that, The total optical length TTL2 of the optical lens at the wide-angle end and the total optical length TTL1 of the optical lens at the main camera end satisfy the following condition: TTL2 / TTL1≤1.

5.

12. The optical lens according to any one of claims 1 to 11, characterized in that, The aperture value F1# of the optical lens at the main camera end and the aperture value F2# of the optical lens at the wide-angle end satisfy: 0≤|F1# / F2#|≤0.

8.

13. The optical lens according to any one of claims 1 to 12, characterized in that, The optical power of the last lens in the optical lens is negative.

14. The optical lens according to any one of claims 1 to 13, characterized in that, The focal length f3 of the last lens in the optical lens and the effective focal length EFL2 of the optical lens at the wide-angle end satisfy: 0.5≤|f3 / EFL2|≤20.

15. The optical lens according to any one of claims 1 to 14, characterized in that, The first focusing lens and / or the second focusing lens are liquid lenses.

16. The optical lens according to any one of claims 1 to 15, characterized in that, The first focusing lens and / or the second focusing lens are variable surface lenses, and the object side and / or image side of the variable surface lens are variable surface surfaces.

17. The optical lens according to any one of claims 1 to 16, characterized in that, The number of lenses in the second group of lenses is greater than or equal to 2.

18. A camera module, characterized in that, It includes a photosensitive element and an optical lens as described in any one of claims 1 to 17, the optical lens being used to receive light from a subject and project it onto the photosensitive element.

19. The camera module according to claim 18, characterized in that, The camera module also includes a motor, which drives the optical lens to perform optical zoom.

20. The camera module according to claim 18 or 19, characterized in that, The camera module also includes a prism or a reflector to change the direction of the light path, so that the light after passing through the prism or the reflector can propagate along the extension direction of the optical axis of the optical lens.

21. An electronic device, characterized in that, The system includes an image processor and a camera module as described in any one of claims 18 to 20, wherein the image processor is communicatively connected to the camera module and is used to receive and process images acquired by the camera module.

Images