Imaging lenses, camera modules and electronic devices

Abstract

This application provides an imaging lens, a camera module, and an electronic device. The imaging lens includes at least six lenses with optical power. By rationally allocating the number, position, and shape of the imaging lens lenses, and by using the optical power of the first, second, third, and fourth lenses arranged sequentially on the object side, and the N-1 and Nth lenses arranged sequentially on the image side, the resulting imaging lens achieves large aperture and large target area optical performance, significantly improving image quality. Furthermore, the imaging lens has a relatively small actual length, facilitating the thinning design of the camera module and electronic device. The relatively long back focal length of the imaging lens better meets the needs of focusing or zooming operations, ensuring high-definition imaging effects. Moreover, when not in operation, the imaging lens can have a smaller overall optical length by compressing the long back focal length, significantly reducing the thickness of the camera module and facilitating the thinning of the electronic device.

Description

Technical Field

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

[0002] In recent years, with the development of camera technology, camera modules have become an indispensable functional component in electronic products such as mobile phones, tablets, laptops and wearable devices. With the development of multifunctional electronic devices, their shooting effects and requirements are increasingly comparable to those of SLR cameras, and the functional effects of camera modules have gradually become one of the important features of electronic devices.

[0003] Currently, camera modules typically include an imaging lens and an image sensor. The imaging lens is usually formed by arranging multiple lenses sequentially along the optical axis. Light passes through the imaging lens and is projected onto the image sensor for photoelectric conversion, which is then used for imaging. Therefore, the performance of the imaging lens directly determines the imaging performance of the camera module. To meet the demand for image quality, imaging lenses are increasingly developing towards larger apertures, larger lens surfaces, and higher resolution. For lenses with larger lens surfaces and larger apertures, increasing the number of lenses is usually used to provide greater design freedom. This results in a longer imaging lens body and overall optical length, making it difficult to balance optical performance and thinner design requirements. Therefore, there is an urgent need for an imaging lens that can meet both high imaging quality and thinner design requirements. Summary of the Invention

[0004] This application provides an imaging lens, a camera module, and an electronic device. The imaging lens can meet the optical performance requirements of large aperture, large target area, and high definition, achieving high-quality imaging. Moreover, the imaging lens has a small length, which is conducive to the thinning design of the imaging lens and camera module.

[0005] The first aspect of this application provides an imaging lens, comprising at least N lenses arranged sequentially along the optical axis from the object side to the image side and each having an optical power, wherein N is greater than or equal to 6, and the N lenses are respectively a first lens, a second lens, a third lens, a fourth lens, ..., the (N-1)th lens, and the Nth lens. Among the plurality of lenses with optical powers in the imaging lens, the lens closest to the image side is the Nth lens, and the lens adjacent to the Nth lens and located on the side of the Nth lens facing the object side is the (N-1)th lens.

[0006] The first lens has positive optical power, with its object-side surface (at least the portion corresponding to the optical axis) being convex and its image-side surface (at least the portion corresponding to the optical axis) being concave. The second lens has negative optical power, with its object-side surface (at least the portion corresponding to the optical axis) being convex and its image-side surface (at least the portion corresponding to the optical axis) being concave. The third lens has positive optical power, with its image-side surface (at least the portion corresponding to the optical axis) being convex. The fourth lens has negative optical power, with its object-side surface (at least the portion corresponding to the optical axis) being concave. The (N-1)th lens has positive optical power, with its image-side surface (at least the portion corresponding to the optical axis) being convex, and the Nth lens has negative optical power, with its object-side surface (at least the portion corresponding to the optical axis) being concave. By rationally allocating the number, shape, and position of the lenses, and by sequentially placing four lenses adjacent to the object side and two lenses adjacent to the image side, the resulting imaging lens achieves large aperture, large focal length, and high resolution optical performance, resulting in excellent optical quality and significantly improved image quality and effect.

[0007] The imaging lens formed by adopting the above architecture achieves a reasonable allocation of optical power and the shape of each lens, and also helps to reduce the actual length of the imaging lens body. Taking the working state of the imaging lens as the first state, when the imaging lens is in the first state, the imaging lens can satisfy the condition 0.35≤TTL1 / (2*IMH)≤0.6, where IMH is the half-image height of the imaging lens. Under the condition of ensuring high imaging quality of large target surface, the imaging lens has a small actual length, which is conducive to reducing the length of the camera module, thereby realizing the thinning design of the imaging lens and camera module, and thus meeting the thinning requirements of electronic devices.

[0008] When the imaging lens is in the first state, all the lenses in the imaging lens or at least one lens near the image side of the imaging lens can move along the optical axis to change the focal length of the imaging lens, realize focusing or zooming operations, and improve the imaging quality of the imaging lens.

[0009] Furthermore, when the imaging lens is in its first state, it also satisfies the condition TTL1 / TTL≤0.85, where TTL1 is the length of the imaging lens along the optical axis, and TTL is the total optical length of the imaging lens. This gives the imaging lens a longer back focal length, providing more room for movement to facilitate the movement of all lens elements or at least one lens element near the image side, enabling focusing or zooming operations. This better meets the needs of focusing or zooming operations, further improving the shooting effect, ensuring high-definition imaging, and enhancing the resolution of the imaging lens, thus further improving image quality.

[0010] When the imaging lens is in the first state, it also satisfies the condition BFL≥1.2, where BFL is the back focal length of the imaging lens. Under the condition of ensuring that the imaging lens has a long back focal length, the imaging lens has a long total optical length, which ensures the high-quality imaging performance of the large target surface of the imaging lens.

[0011] In one possible implementation, all lens elements in the imaging lens move along the optical axis toward the image side, compressing the back focal length to switch the imaging lens from a first state to a second state. In other words, when the imaging lens switches from the first state to the second state, all lens elements move along the optical axis toward the image side, compressing the optical back focal length. This results in a smaller overall optical length for the imaging lens in the second state, reducing the space occupied by the imaging lens and facilitating the thinning of camera modules and electronic devices. Furthermore, because the imaging lens has a longer back focal length in the first state, it provides more compressible space, allowing for a smaller overall optical length when switching to the second state. This enables extremely thin camera modules, reducing their space occupation and further facilitating the thinning of electronic devices.

[0012] In summary, when the imaging lens is in its first state, it ensures optical performance with a large aperture, large focal length, and high definition, while also possessing a long back focal length, facilitating zooming and focusing operations to further enhance shooting results. Furthermore, the actual length of the lens is relatively small, enabling the thinning of camera modules and electronic devices. When the imaging lens switches to its second state, the movement of all lens elements compresses the optical back focal length, reducing the overall optical length and further reducing the thickness of the camera module and electronic devices. By defining the imaging lens's working state as the first state and its non-working state as the second state, the imaging lens can maintain a smaller length and excellent image quality in the working state, ensuring image quality. Moreover, the movement of all lens elements allows for state switching, enabling the imaging lens to have an even smaller overall optical length in the non-working state, further contributing to the thinning of camera modules and electronic devices.

[0013] In one possible implementation, the first lens satisfies the conditions Nd1≤1.65 and Vd1≥50, where Nd1 is the refractive index of the first lens and Vd1 is the Abbe number of the first lens. Making the first lens a low-refractive-index, high-Abbe-number material can effectively eliminate chromatic aberration, achieving large target area, large aperture, and high-definition optical performance, thus improving the imaging quality and effect of the camera module.

[0014] In a possible implementation, when the imaging lens is in the first state, the imaging lens also satisfies the conditional formula 0.5 ≤ TTL / (2*IMH) ≤ 0.7. Under the condition of ensuring a certain target surface, the optical total length of the imaging lens can be reduced, and the low total length characteristic of the imaging lens can be achieved, thereby facilitating the thinning design of the camera module and the electronic device.

[0015] In a possible implementation, when the imaging lens is in the first state, the imaging lens also satisfies the conditional formula 0.8 ≤ IMH / EFL ≤ 1.2, where EFL is the focal length of the imaging lens. Under the condition of ensuring a certain focal length, the imaging target surface of the imaging lens can be further increased, and the large target surface characteristic of the imaging lens can be achieved, so that the imaging lens can be paired with an image sensor with a large target surface size, and the large target surface imaging of the camera module can be further realized, improving the imaging quality and effect.

[0016] In a possible implementation, when the imaging lens is in the first state, the imaging lens also satisfies the conditional formula TTL1 < EFL < TTL. Under the condition of ensuring a certain focal length, the actual length of the imaging lens is significantly lower than the optical total length of the imaging lens, which is convenient for adjusting the length between the imaging lens (the image side of the Nth lens) and the image sensor, that is, it is convenient for adjusting the back focal length, and thus it is convenient for realizing the long back focal design of the imaging lens.

[0017] In a possible implementation, when the imaging lens is in the first state, the imaging lens also satisfies the conditional formula 1.4 ≤ F# ≤ 2.2, where F# is the aperture number of the imaging lens. Under the condition of ensuring high resolution, the large aperture characteristic of the imaging lens is realized, which is further beneficial to improving the imaging quality and effect.

[0018] In a possible implementation, when the imaging lens is in the first state, the first lens also satisfies the conditional formula 1 ≤ f1 / EFL ≤ 1.5, where f1 is the focal length of the first lens, so that the optical power of the first lens is relatively large, the first lens has a large refractive ability, and the optical power is reasonably distributed. Under the condition of further improving the imaging quality and effect, it is also beneficial to reduce the optical total length of the imaging lens and facilitate the thinning of the camera module and the electronic device.

[0019] In a possible implementation, multiple lenses with optical power in the imaging lens are aspherical lenses respectively, which can effectively eliminate aberration and are further beneficial to improving the imaging quality and effect.

[0020] In one possible implementation, N=7, the (N-1)th lens is the sixth lens, the Nth lens is the seventh lens, the fifth lens is located between the fourth and sixth lenses, and the fifth lens has negative optical power. The structural design of the imaging lens is relatively simple, and it is easy to achieve the characteristics of the imaging lens such as large aperture, large target surface, long back focal length, and low total optical length and actual length.

[0021] A second aspect of this application provides a camera module, comprising at least an image sensor and any of the aforementioned imaging lenses, wherein the image sensor is located on the image-facing side of the imaging lens. By including the imaging lens, in a first state, the imaging lens possesses a large aperture, large focal length, high-resolution imaging performance, and a relatively small actual length, enabling the camera module to achieve better image quality and effect, and facilitating a thinner design for the camera module. Furthermore, in the first state, the imaging lens can achieve focusing or zooming operations by moving all lenses or at least one lens near the image side, thereby improving image quality. Moreover, the imaging lens has a relatively long back focal length, facilitating focusing or zooming operations and further enhancing the shooting performance of the camera module.

[0022] A third aspect of this application provides an electronic device, including a housing and the aforementioned camera module, wherein the camera module is disposed within the housing. By including the camera module, the camera module has better imaging performance and a smaller length, which is beneficial for improving the performance of the electronic device and for enabling a thinner design of the electronic device.

[0023] When the imaging lens is in the first state, at least part of the imaging lens extends outside the housing, reducing the impact of the long back focal length and long total optical length of the imaging lens on the thickness of the electronic device. This facilitates the thinning of the electronic device while ensuring the optical performance of the imaging lens.

[0024] When the imaging lens switches from the first state to the second state, all the lenses of the imaging lens move along the optical axis toward the inside of the housing, thereby compressing the optical back focal length, reducing the total optical length of the imaging lens, and further reducing the space occupied by the camera module. When the imaging lens is in the second state, even if the entire camera module is placed inside the electronic device, it will not greatly restrict the thickness design of the electronic device, making it easier to achieve the thinning of the electronic device. Attached Figure Description

[0025] Figure 1 A schematic diagram of the rear structure of an electronic device provided in an embodiment of this application;

[0026] Figure 2 A schematic diagram of the disassembled structure of an electronic device provided in an embodiment of this application;

[0027] Figure 3 for Figure 1 A schematic cross-sectional view of the electronic equipment along line AA;

[0028] Figure 4 This is a schematic diagram of the structure of a camera module provided in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the structure of an imaging lens in an electronic device when it is in a first state, as provided in an embodiment of this application.

[0030] Figure 6 This is a schematic diagram of the structure of an imaging lens in an electronic device when it is in a second state, as provided in an embodiment of this application.

[0031] Figure 7 This is a simulation structure diagram of a camera module in a first state, provided in Embodiment 1 of this application.

[0032] Figure 8 A color difference curve diagram of a camera module provided in Embodiment 1 of this application;

[0033] Figure 9 This is a distortion curve diagram of a camera module provided in Embodiment 1 of this application;

[0034] Figure 10 This is a schematic diagram of a simulation structure of a camera module in a first state, provided in Embodiment 2 of this application.

[0035] Figure 11 This is a color difference curve diagram of a camera module provided in Embodiment 2 of this application;

[0036] Figure 12 This is a distortion curve diagram of a camera module provided in Embodiment 2 of this application;

[0037] Figure 13 This is a simulation structure diagram of a camera module in a first state, provided in Embodiment 3 of this application;

[0038] Figure 14 This is a color difference curve diagram of a camera module provided in Embodiment 3 of this application;

[0039] Figure 15 This is a distortion curve diagram of a camera module provided in Embodiment 3 of this application;

[0040] Figure 16 This is a schematic diagram of a simulation structure of a camera module in a first state, provided in Embodiment 4 of this application.

[0041] Figure 17 This is a color difference curve diagram of a camera module provided in Embodiment 4 of this application;

[0042] Figure 18 This is a distortion curve diagram of a camera module provided in Embodiment 4 of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100 - Electronic devices;

[0045] 101 - Shell;

[0046] 102 - Back cover; 112 - Light inlet hole;

[0047] 103 - Display screen;

[0048] 113 - Display panel; 123 - Display cover;

[0049] 104 - Control circuit board;

[0050] 105 - Camera module;

[0051] 10 - Imaging lens; 11 - First lens element; 12 - Second lens element; 13 - Third lens element; 14 - Fourth lens element; 15 - Fifth lens element; 16 - Sixth lens element; 17 - Seventh lens element; 18 - Aperture stop;

[0052] 20 - Image sensor;

[0053] 30-Filter;

[0054] 40 - Module circuit board;

[0055] 50 - Support component; 51 - Clearance through hole;

[0056] 106 - Lens cover plate;

[0057] 107 - Decorative parts;

[0058] 108 - Avoid the gap. Detailed Implementation

[0059] The terminology used in the implementation section of this application is for the purpose of explaining specific embodiments of this application only, and is not intended to limit this application.

[0060] To facilitate understanding, the relevant technical terms involved in the embodiments of this application will first be explained and described.

[0061] The object side is the side where the object is located, with the imaging lens as the boundary. The side of the lens or optical element facing the object side is the object side.

[0062] The image side is the side on which the image of the subject is located, while the side of a lens or optical element that faces the image side is the image side surface.

[0063] The optical axis refers to the ray that passes through the center of each lens element of an imaging lens (see reference). Figure 3 and Figure 4 (axis L in the middle).

[0064] The imaging surface is located on the image side of all the lenses in the imaging lens, and the surface on which light passes through each lens in the imaging lens in sequence to form an image. In the embodiments of this application, the imaging surface refers to the photosensitive surface of the image sensor.

[0065] Half image height (IMH in this application) refers to half the height of the whole image formed by the imaging lens, which is the maximum radius of the imaging circle.

[0066] Optical power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam, and it characterizes the refractive power of a lens for incident parallel beams.

[0067] Positive focal length means that the lens has a positive focal length and has the effect of converging light.

[0068] Negative power means that the lens has a negative focal length, which has the effect of diverging light.

[0069] The Abbe number, also known as the dispersion coefficient, is the ratio of the difference in refractive index of an optical material at different wavelengths, indicating the degree of dispersion of the material.

[0070] Refractive index is the ratio of the speed of light in a vacuum (air) to the speed of light in the lens material. The higher the refractive index of a lens, the stronger its ability to refract incident light. A higher refractive index also means a thinner lens; that is, for lenses of the same thickness at the center, with the same prescription and material, lenses with a higher refractive index will have thinner edges than those with a lower refractive index.

[0071] The radius of curvature is the reciprocal of the curvature. The curvature of a plane curve is the rate of rotation of the tangent angle about a point on the curve with respect to the arc length. It is defined by differentiation and indicates the degree to which the curve deviates from a straight line.

[0072] Focal length, also known as focal length, is usually expressed as effective focal length (EFL) to distinguish it from parameters such as front focal length and back focal length. Focal length or effective focal length is a measure of how well light converges or diverges in an optical system. It refers to the perpendicular distance from the optical center of a lens or lens group to the focal plane when a distant object is projected into a sharp image. From a practical perspective, it can be understood as the distance from the center of the imaging lens to the image plane.

[0073] Back focal length (BFL) is the length along the optical axis from the image side of the lens closest to the image side of the imaging lens to the imaging plane. In this application, see [reference needed]. Figure 4 As shown, the back focal length BFL can be the length on the optical axis from the image side of the lens (such as the seventh lens) located closest to the image side to the photosensitive surface of the image sensor.

[0074] Aperture is a device used to control the amount of light passing through a lens or lens group and entering the photosensitive surface of the camera module. It is usually fixed inside the camera module and the aperture size is expressed by the value F#.

[0075] Light intake refers to the amount of light that passes through the lens or lens group (imaging lens) and reaches the photosensitive surface.

[0076] The target surface refers to the photosensitive surface of an image sensor. The larger the target surface, the greater the amount of light the image sensor can capture, and the higher the image height.

[0077] The aperture number F# is a relative value (the reciprocal of the relative aperture) obtained by dividing the focal length of the imaging lens by the light-gathering diameter (entrance pupil diameter) of the imaging lens. The smaller the F# value, the more light enters in the same unit of time, the shallower the depth of field, and the background content of the photo will be blurred, producing an effect similar to that of a telephoto lens.

[0078] Total track length (TTL), also known as total height or total length, refers to the total length along the optical axis from the object-side surface of the lens closest to the object side of the imaging lens to the imaging plane. It is a major factor in determining the height of the camera module. See also [reference needed] in this application. Figure 4 As shown, the total optical length (TTL) can be the length along the optical axis from the object side of the lens (such as the first lens) located closest to the object side to the photosensitive surface of the image sensor.

[0079] The length of the imaging lens is its actual length (or mechanical length) along the optical axis, denoted by TTL1. It is the length along the optical axis from the object-side surface of the lens closest to the object side to the image-side surface of the lens closest to the image side. See also [reference needed] in this application. Figure 4 As shown, taking an imaging lens comprising seven lenses as an example, the length TTL1 of the imaging lens on the optical axis can be the length on the optical axis from the object side of the first lens closest to the object side to the image side of the seventh lens closest to the image side.

[0080] This application provides an electronic device, which may include, but is not limited to, mobile phones, tablet computers, laptops, cameras, ultra-mobile personal computers (UMPCs), handheld computers, walkie-talkies, netbooks, POS machines, personal digital assistants (PDAs), wearable devices, virtual reality (VR) devices (such as VR glasses, VR headsets, etc.), augmented reality (AR) devices (such as AR glasses, AR headsets, etc.), in-vehicle devices, and other electronic devices with camera modules.

[0081] In this embodiment of the application, a mobile phone is taken as an example. The mobile phone can be a candybar phone or a foldable phone. Specifically, the following description will use a candybar phone as an example.

[0082] Figure 1 This is a schematic diagram of the rear structure of an electronic device provided in an embodiment of this application. Figure 2 This is a schematic diagram showing the disassembled structure of an electronic device 100 provided in an embodiment of this application.

[0083] In the embodiments of this application, combined with Figure 1 and Figure 2 As shown, the width direction of the electronic device 100 is taken as the x-direction, the length direction as the y-direction, and the thickness direction as the z-direction. The x, y, and z directions are all perpendicular to each other. It can be understood that the coordinate directions of the electronic device 100 can be flexibly set according to actual design requirements.

[0084] See Figure 1 As shown, the electronic device 100 may include a housing 101 and a rear cover 102. The housing 101 may be an annular frame structure, and the rear cover 102 may be fitted and fixed onto the housing 101. Figure 2 As shown, the electronic device 100 may also include a display screen 103, which may be fixed on the housing 101. The display screen 103 and the back cover 102 may be fixed on opposite sides of the housing 101 along the thickness z direction.

[0085] The back cover 102, the display screen 103, and the housing 101 together form the internal space of the electronic device 100. This internal space can be used to accommodate various structural components of the electronic device 100, such as the control circuit board 104, the camera module 105, the battery, the earpiece, the microphone, etc.

[0086] The housing 101 may include a middle plate and a frame. The middle plate is located inside the frame, and the frame may be arranged around the middle plate in the circumferential direction. The back cover 102 and the display screen 103 may be fixed on both sides of the frame along the thickness z direction. The middle plate is located in the internal space of the electronic device 100, and the various structural components of the electronic device 100 may also be fixed on the middle plate.

[0087] The back cover 102 can serve as the back appearance of the electronic device 100.

[0088] The back cover 102 and the housing 101 can be two independent structural components fixed together. For example, the back cover 102 and the housing 101 can be molded separately, and the back cover 102 can be fixedly assembled with the housing 101 by means of adhesive bonding, fastener connection, snap-fit ​​connection, etc. Alternatively, the back cover 102 and the housing 101 can also be a single integral structure. For example, the back cover 102 and the housing 101 can be integrally molded to form a single structural component by means of injection molding, mold forming, etc.

[0089] The display screen 103 can serve as the front display surface of the electronic device 100. The display screen 103 is used to display images, text, etc., to meet the display requirements of the electronic device 100. The display screen 103 can be a flat screen, or it can also include a curved screen.

[0090] See Figure 2 As shown, the display screen 103 may include a display panel 113 and a display cover 123. The display panel 113 is used to realize the display function, and the display cover 123 can be a cover that allows light to pass through. For example, the material of the display cover 123 can be a transparent material, such as glass or plastic.

[0091] The display cover 123 is stacked on the display panel 113. The display cover 123 can be located on the side of the display panel 113 facing away from the rear cover 102. The display cover 123 is set close to the display panel 113. The display cover 123 is mainly used to protect the display panel 113 and prevent dust.

[0092] The display panel 113 can be a liquid crystal display (LCD), an organic light-emitting diode (OLED) display panel, an active-matrix organic light-emitting diode (AMOLED) display panel, a quantum dot light-emitting diode (QLED) display panel, or a micro light-emitting diode (Micro LED) display panel, etc.

[0093] Combination Figure 1 and Figure 2 As shown, the electronic device 100 may also include a camera module 105, which may be located within the internal space enclosed by the housing 101, the back cover 102, and the display screen 103.

[0094] The camera module 105 is used to realize shooting functions such as taking pictures or recording videos. For example, it can be used to shoot and record images, and its shooting scenarios can include various complex and diverse shooting application scenarios, such as different scenes such as indoor, outdoor, people, and environment.

[0095] Among them, the camera module 105 can be used as the rear camera of the electronic device 100, such that the light-incoming side (the side adjacent to the object) of the camera module 105 is located on the back of the electronic device 100 (the side with the back cover 102 along the thickness direction).

[0096] Figure 3 for Figure 1 A schematic cross-sectional view of the electronic equipment along line AA.

[0097] For example, see Figure 3 As shown, the camera module 105 can be fixed on the side of the display screen 103 facing the rear cover 102, or the camera module 105 can also be fixed on the side of the middle plate facing the rear cover 102, with the light-incoming side of the camera module 105 facing the rear cover 102.

[0098] A light inlet hole 112 can be provided on the back cover 102. The light inlet hole 112 can connect the inside and outside of the electronic device 100. The camera module 105 (light inlet side) can face the light inlet hole 112. Light can shine onto the camera module 105 through the light inlet hole 112. The camera module 105 can also extend out of the housing 101 or retract into the housing 101 through the light inlet hole 112.

[0099] The shape of the light inlet 112 can be a regular shape, for example, the shape of the light inlet 112 can be a circle (see reference). Figure 2 As shown), of course, in some other examples, the shape of the light inlet 112 can also be other regular shapes, for example, the shape of the light inlet 112 can also be elliptical, or the shape of the light inlet 112 can also be other irregular shapes.

[0100] The electronic device 100 may also include a lens cover 106, which covers the light inlet 112. The lens cover 106 can be a light-transmitting cover, and its material can be transparent, such as glass or plastic. Light can pass through the lens cover 106 and the light inlet 112 to enter the interior of the electronic device 100 and illuminate the camera module 105, where it is captured by the camera module 105 to form images or videos.

[0101] To improve aesthetics and sealing, the electronic device 100 may further include a decorative element 107, which can be fitted inside the light inlet 112, with its outer wall tightly against the circumferential inner wall of the light inlet 112. A lens cover 106 may be disposed on the decorative element 107, such as on the side of the decorative element 107 facing away from the display screen 103, and the lens cover 106 may be fitted inside the decorative element 107.

[0102] It is understandable that the projection of the decorative part 107 and the lens cover 106 in the thickness z direction can completely cover the entire light inlet hole 112. The decorative part 107 and the lens cover 106 can isolate the internal space of the electronic device 100 from the external environment, preventing water or dust in the external environment from entering the internal space of the electronic device 100 through the light inlet hole 112, causing damage to the internal structural components of the electronic device 100, and improving the reliability and service life of the electronic device 100.

[0103] Continue to see Figure 3 As shown, the electronic device 100 may also include a control circuit board 104, which may be located within the internal space enclosed by the housing 101, the rear cover 102, and the display screen 103.

[0104] For example, the control circuit board 104 can also be fixed on the side of the display screen 103 facing the rear cover 102 (in conjunction with...). Figure 2 (as shown), or the control circuit board 104 can also be fixed on the side of the middle plate facing the rear cover 102.

[0105] The control circuit board 104 can be a rigid circuit board, a flexible circuit board, or a rigid-flex circuit board. The control circuit board 104 can be used to carry electronic devices such as chips, capacitors, and inductors, and can realize electrical connections between electronic devices. Among them, the chips can be central processing units (CPUs), graphics processing units (GPUs), digital signal processing (DSPs), and universal flash storage (UFS), etc.

[0106] The control circuit board 104 and the camera module 105 are located on the same side of the display screen 103. The control circuit board 104 can be set adjacent to the camera module 105 to facilitate electrical connection between the control circuit board 104 and the camera module 105.

[0107] For example, the camera module 105 and the control circuit board 104 can be stacked along the thickness z direction, such that the control circuit board 104 is fixed on the side of the display screen 103 facing the rear cover 102, and the camera module 105 is stacked on the side of the control circuit board 104 facing away from the display screen 103.

[0108] Alternatively, to reduce or avoid the increase in thickness caused by stacking, the control circuit board 104 may have a clearance notch 108. The clearance notch 108 can penetrate the control circuit board 104 along the thickness z direction. The camera module 105 and the control circuit board 104 can be fixed to the side of the display screen 103 facing the rear cover 102, and the camera module 105 can be located within the clearance notch 108 (in conjunction with...). Figure 2 As shown, by having overlapping areas in the projections of the camera module 105 and the control circuit board 104 in the width x direction and length y direction, the increased thickness of the electronic device 100 due to the stacking of the camera module 105 and the control circuit board 104 can be avoided, which is beneficial for achieving a thinner design of the electronic device 100. Furthermore, it can also reduce the space occupied by the control circuit board 104 and the camera module 105 inside the electronic device 100, improve the integration of the layout, and facilitate the layout of internal structural components of the electronic device 100.

[0109] The shape of the clearance notch 108 can match the shape of the camera module 105 to further improve the layout integration of the camera module 105 and the control circuit board 104. For example, the overall outer contour of the camera module 105 can be rectangular, and the shape of the clearance notch 108 can also be rectangular (see reference). Figure 2(As shown). Of course, in some other examples, the shape of the clearance notch 108 can be other regular shapes, such as circles, ovals, etc., or the shape of the clearance notch 108 can also be other irregular shapes, which can be selected and set according to the actual design requirements.

[0110] Alternatively, in some other examples, the control circuit board 104 may not have an avoidance notch 108. The control circuit board 104 and the camera module 105 are fixed at intervals on the side of the display screen 103 facing the back cover 102, which can also achieve the effect of avoiding the stacking of the two and increasing the thickness of the electronic device 100.

[0111] The electronic device 100 may also include a processor (not shown in the figure), such as a central processing unit (CPU). The camera module 105 is electrically connected to the control circuit board 104, and the control circuit board 104 is electrically connected to the processor, so that the camera module 105 is electrically connected to the processor through the control circuit board 104. When the processor receives a user instruction, the processor can send a signal to the camera module 105 through the control circuit board 104 to control the camera module 105 to capture images or record videos.

[0112] Of course, in some other examples, the electronic device 100 may not have a control circuit board 104, and the camera module 105 may directly receive user instructions and take pictures or record videos according to the user instructions.

[0113] Alternatively, the camera module 105 can also serve as the rear camera of the electronic device 100, such that the light-receiving side of the camera module 105 is located on the front of the electronic device 100 (the side with the display screen 103 along the thickness direction).

[0114] For example, the camera module 105 can be disposed on the side of the rear cover 102 facing the display screen 103, or the camera module 105 can also be disposed on the side of the middle plate facing the display screen 103. A light-entry hole can be provided on the display screen, and a lens cover plate can be provided on the light-entry hole. Light can pass through the lens cover plate and the light-entry hole into the electronic device and illuminate the camera module so that it can be captured by the camera module and form an image or video, etc.

[0115] The control circuit board 104 can also be set on the side of the rear cover 102 facing the display screen 103, or the control circuit board 104 can also be set on the side of the middle plate facing the display screen 103. The layout of the control circuit board 104 and the camera module 105 can be referred to the previous text, and will not be repeated here.

[0116] It is understood that the structures illustrated in the embodiments of this application do not constitute a specific limitation on the electronic device 100. In other embodiments of this application, the electronic device 100 may include more or fewer components than illustrated, or combine some components, or split some components, or arrange the components differently. For example, the electronic device 100 may also include devices such as antennas, sensors, and flashlights.

[0117] The following explanation uses the rear camera module as an example to illustrate the structure of the camera module.

[0118] Continue to see Figure 3 As shown, the camera module 105 may include an imaging lens 10 and an image sensor 20. The optical axis of the imaging lens 10 may be the same as the optical axis of the camera module 105, as shown by the dashed optical axis L in the figure. The optical axis of the imaging lens 10 may be parallel to the thickness z direction of the electronic device 100. It is understood that, in the embodiments of this application, the thickness of the imaging lens or camera module may refer to the length of the imaging lens or camera module along the optical axis L, that is, the thickness z direction.

[0119] The image sensor 20 is located on the side of the imaging lens 10 that is away from the object side, that is, the image sensor 20 is located on the side of the imaging lens 10 that faces the display screen 103. The imaging lens 10 can be located between the object being photographed and the image sensor 20. The photosensitive surface of the image sensor 20 can face the light-emitting side (the side adjacent to the image side) of the imaging lens 10.

[0120] Ambient light can pass through the lens cover 106 and the light inlet 112 to enter the camera module 105. The light entering the camera module 105 passes through the imaging lens 10 and then illuminates the image sensor 20, specifically, the photosensitive surface of the image sensor 20. The imaging lens 10 is used to form an optical image (light signal) of the subject. The photosensitive surface of the image sensor 20 receives the optical image of the subject, converts the light signal into an image electrical signal, and outputs it, thereby realizing the camera module's photo or video recording function.

[0121] The camera module 105 may also include a module circuit board 40, and an image sensor 20 may be fixed on the module circuit board 40. For example, the module circuit board 40 may be fixed on the side of the display screen 103 facing the rear cover 102, and the image sensor 20 may be fixed on the side of the module circuit board 40 facing the imaging lens 10. The image sensor 20 is located between the module circuit board 40 and the imaging lens 10.

[0122] The image sensor 20 is electrically connected to the module circuit board 40, and the module circuit board 40 can be electrically connected to the control circuit board 104. When the image sensor 20 acquires an optical image and converts it into an image electrical signal, the electrical signal can be transmitted to the control circuit board 104, so that the image electrical signal can be transmitted to the processor through the control circuit board 104 to realize the display of the image, etc.

[0123] For example, a groove can be formed on the side of the module circuit board 40 facing the imaging lens 10, and the image sensor 20 can be fixed in the groove, so that the projected portions of the module circuit board 40 and the image sensor 20 in the width x direction and the length y direction overlap, reducing the space occupied by the image sensor 20 and the module circuit board 40 in the thickness z direction, which is conducive to realizing the miniaturization design of the camera module 105 to meet the thinning requirements of the electronic device 100.

[0124] It is understood that the module circuit board 40 can be a rigid circuit board, a flexible circuit board, or a rigid-flex circuit board, and this application does not limit it in this regard.

[0125] The image sensor 20 can be a charge-coupled device (CCD), or a complementary metal-oxide semiconductor (CMOS). Alternatively, it can be any other device capable of photoelectric conversion.

[0126] The camera module 105 may also include other electronic components or chips, such as driver chips, or other electronic components or chips used to assist the image sensor 20 in acquiring optical signals and processing the acquired optical signals. These electronic components or chips can be fixed to the outer periphery of the image sensor 20 to facilitate its function.

[0127] The camera module 105 may also include a filter 30, which may be located between the image sensor 20 and the imaging lens 10. Light passing through the imaging lens 10 is filtered by the filter 30 and then shines on the photosensitive surface of the image sensor 20. The filter 30 can be used to filter stray light (light that is not conducive to optical image imaging) passing through the optical lens and to allow the filtered light to propagate to the image sensor 20, thereby ensuring that the image has better clarity.

[0128] The filter 30 can be a blue glass filter. Alternatively, the filter 30 can be of other types, such as a reflective infrared filter or a dual-pass filter (a dual-pass filter allows visible light and infrared light to pass through simultaneously, or allows visible light and other specific wavelengths of light (e.g., ultraviolet light) to pass through simultaneously, or allows infrared light and other specific wavelengths of light (e.g., ultraviolet light) to pass through simultaneously).

[0129] To achieve the fixed assembly of the filter 30, the camera module 105 may also include a support member 50. The support member 50 is located between the imaging lens 10 and the module circuit board 40. The two sides of the support member 50 along the thickness z direction can be fixed to the imaging lens 10 and the module circuit board 40 respectively, such as by adhesive bonding.

[0130] The filter 30 can be fixed on the support member 50. A clearance through hole 51 can be provided on the support member 50, which can be opposite to the image sensor 20 so that light can smoothly illuminate the image sensor 20.

[0131] The performance of the imaging lens has a significant impact on image quality and effect. The sensor size, depth of field, and resolution of a camera module are all determined by the imaging lens. For example, a larger sensor size corresponding to the imaging lens results in greater light sensitivity, which is more conducive to improving image brightness and resolution. Depth of field is related to the aperture of the imaging lens. Depth of field is the range of distances in front of and behind the subject that can be captured in a sharp image by the leading edge of the imaging lens. Alternatively, it can be understood as the range of distances in front of and behind the focal point that produce a sharp image after the imaging lens has focused. A larger aperture results in a deeper depth of field, which is more conducive to highlighting the subject in the image and ensuring that both foreground and background elements are captured in sharp images simultaneously. Therefore, current imaging lenses are increasingly developing towards larger apertures, larger sensor sizes, and higher resolution.

[0132] For lenses with large apertures and large aperture surfaces, the length of the imaging lens and the overall optical length are often sacrificed, making it difficult to balance the requirements of optical performance and a low-length design. This makes the length of the imaging lens and the overall optical length the main factors affecting image quality. Excessive length and overall optical length of the imaging lens result in a larger space occupied by the lens, affecting the overall length of the camera module (length along the optical axis), which is a crucial reference indicator for the thickness design of electronic devices. Therefore, there is an urgent need for a lens that can achieve the imaging requirements of large aperture, large aperture surface area, and high clarity, while maintaining a relatively small length, facilitating the thinning of camera modules and electronic devices.

[0133] Based on this, the imaging lens provided in this application embodiment can meet the optical performance requirements of large aperture, large target area, and high definition, and has high optical quality, which is conducive to achieving high-quality imaging. Moreover, the actual length of the imaging lens itself is relatively small, which is conducive to realizing the miniaturization and thinning design of the camera module.

[0134] The imaging lens and camera module including the imaging lens provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0135] Figure 4 This is a schematic diagram of the structure of a camera module provided in an embodiment of this application.

[0136] See Figure 4 As shown, with Figure 4 The dashed line L is the optical axis of the imaging lens 10. The camera module 105 includes an imaging lens 10, a filter 30 and an image sensor 20 arranged sequentially from the object side to the image side along the optical axis L. The light entering the camera module 105 passes through the imaging lens 10 and the filter 30 in sequence and then illuminates the image sensor 20, which is received by the photosensitive surface of the image sensor 20 to form a captured image.

[0137] The imaging lens 10 may include multiple lenses, such as lenses, each with an optical power. The multiple lenses may be arranged sequentially from the object side to the image side along the optical axis of the imaging lens 10. The centers of the multiple lenses may be located on the optical axis. The projections of the centers of the multiple lenses in the direction of the optical axis may coincide with each other. Adjacent lenses may be spaced apart, and there may be an air gap between adjacent lenses.

[0138] The imaging lens 10 may also include a lens barrel (not shown in the figure), and multiple lenses may be disposed inside the lens barrel. The optical axis of the imaging lens 10 may coincide with the central axis of the lens barrel. A light-transmitting hole may be provided at the end of the lens barrel facing the object along the optical axis, so that light can enter the lens barrel and pass through the multiple lenses in sequence.

[0139] The filter 30 can also be fixed on the lens barrel. For example, the filter 30 can be fixed on the end face of the lens barrel facing the image side. A through hole can also be opened on the end face of the lens barrel facing the image side so that the light emitted from the imaging lens 10 can pass through the filter 30 and illuminate the image sensor 20.

[0140] The imaging lens 10 may also include an aperture stop 18. The aperture stop 18 can be located on the object-side side of the plurality of optically powerful lenses, that is, the aperture stop 18 is positioned closer to the object side than the plurality of lenses as a whole. The aperture stop 18 can be fixed inside the lens barrel, or it can be fixed outside the lens barrel. Light can first pass through the aperture stop 18, and then pass through the plurality of lenses in sequence before exiting. The aperture stop 18 can limit the light entering the imaging lens 10 to adjust the intensity of the light, and can be used to control the amount of light entering the imaging lens 10. It is understood that the aperture stop 18 may not have optical power.

[0141] The aperture 18 can be a fixed aperture, or in some examples, the aperture 18 can be a variable aperture, which can enable the imaging lens 10 to provide different depth of field ranges for different shooting scenarios, thereby taking into account the shooting needs of multiple scenarios.

[0142] The imaging lens 10 may have at least six lenses with optical power, for example, see [reference needed]. Figure 4 As shown, the imaging lens 10 may include seven lenses with optical power, such as the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16 and the seventh lens 17 arranged sequentially along the optical axis L from the object side to the image side.

[0143] It is understood that the imaging lens 10 may include only the seven lenses with optical power mentioned above, or the number of lenses with optical power in the imaging lens 10 may be greater than seven, that is, one or more lenses may be arranged sequentially from the seventh lens to the image side. Alternatively, the imaging lens 10 may include only six lenses with optical power, such as the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens arranged sequentially from the object side to the image side along the optical axis L.

[0144] In other words, taking N as an example, where N can be a positive integer greater than or equal to 6, the imaging lens 10 may include a first lens, a second lens, a third lens, a fourth lens, ..., an (N-1)th lens, and an Nth lens arranged sequentially along the optical axis from the object side to the image side. Among the N lenses with optical power in the imaging lens 10, the lens closest to the object side is the first lens, the lens adjacent to the first lens and located on the side of the first lens facing the image side is the second lens, and so on up to the (N-1)th lens and the Nth lens. That is, the Nth lens is the lens with optical power closest to the image side in the imaging lens 10, and the lens with optical power adjacent to the Nth lens and located on the side of the Nth lens facing the object side is the (N-1)th lens.

[0145] For example, see Figure 4As shown, taking the imaging lens 10 as an example, which includes seven lenses with optical power, the imaging lens 10 includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, and a seventh lens 17 arranged sequentially along the optical axis L. The lens closest to the object side is the first lens 11, and the lens closest to the image side is the seventh lens 17, that is, the Nth lens is the seventh lens 17, and the sixth lens 16 adjacent to the seventh lens 17 is the (N-1)th lens. After light enters the camera module 105, it passes sequentially through the aperture 18, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, the seventh lens 17, and the filter 30 before illuminating the photosensitive surface of the image sensor 20.

[0146] The first lens 11 can have positive optical power. The object side of the first lens 11, at least the portion corresponding to the optical axis, can be convex, and the image side of the first lens 11, at least the portion corresponding to the optical axis, can be concave. That is, the object side of the first lens 11, at least in the region near the optical axis, can be convex, and the image side of the first lens 11, at least in the region near the optical axis, can be concave.

[0147] The second lens 12 may have negative optical power, and the object-side surface of the second lens 12, at least the portion corresponding to the optical axis, may be convex, and the image-side surface of the second lens 12, at least the portion corresponding to the optical axis, may be concave. The third lens 13 may have positive optical power, and the image-side surface of the third lens 13, at least the portion corresponding to the optical axis, may be convex. The fourth lens 14 may have negative optical power, and the object-side surface of the fourth lens 14, at least the portion corresponding to the optical axis, may be concave.

[0148] The (N-1)th lens can have positive optical power, and the image-side surface of the (N-1)th lens, at least the portion corresponding to the optical axis, can be convex. The Nth lens can have negative optical power, and the object-side surface of the Nth lens, at least the portion corresponding to the optical axis, can be concave, such as... Figure 4 Taking the seven-element imaging lens 10 as an example, the sixth lens 16 can have positive optical power, and the image side of the sixth lens 16, at least the part corresponding to the optical axis, can be a convex surface. The seventh lens 17 can have negative optical power, and the object side of the seventh lens 17, at least the part corresponding to the optical axis, can be a concave surface.

[0149] The imaging lens 10 adopts the above-mentioned structure and optical design, and rationally allocates the number, shape, position, and optical power of the four lenses arranged in sequence on the object side and the two lenses arranged in sequence on the image side. The imaging lens 10 formed by this structure can achieve imaging characteristics of large aperture, large target area and high definition, so that the imaging lens 10 has good optical quality and significantly improves the imaging quality and effect.

[0150] The imaging lens 10 formed by the above architecture can achieve a reasonable allocation of optical power and the shape of each lens, and also helps to reduce the actual length of the imaging lens 10 body, thereby facilitating the thinning design of the camera module 105 and electronic devices.

[0151] In this embodiment, the imaging lens 10 may include a first state and a second state. For example, when the camera module 105 is performing a shooting action, i.e., when the imaging lens 10 in the camera module 105 is used for imaging, the imaging lens 10 is in the first state, which can be considered the working state of the imaging lens 10 and the camera module 105. When the camera module 105 is not performing a shooting action, i.e., when the imaging lens 10 in the camera module 105 is not used for imaging, the imaging lens 10 is in the second state, which can be considered the non-working state of the imaging lens 10 and the camera module 105.

[0152] When the imaging lens 10 is in the first state, with the length of the imaging lens 10 on the optical axis as TTL1 and the half-image height of the imaging lens 10 as IMH, the length TTL1 and the half-image height IMH of the imaging lens 10 can satisfy 0.35≤TTL1 / (2*IMH)≤0.6, so that the imaging lens 10 has a smaller actual length, which is beneficial to reduce the length of the camera module, thereby realizing the thinning design of the imaging lens and the camera module, which is beneficial to meet the thinning requirements of electronic devices.

[0153] In this device, all or part of the lenses of the imaging lens can be movable. For example, all or part of the lenses of the imaging lens can be fixed to the lens barrel in a movable manner, so that all or part of the lenses of the imaging lens can move along the optical axis, which means that all or part of the lenses can move along the optical axis relative to the image sensor, the lens barrel, the housing of the electronic device, etc.

[0154] Specifically, when the imaging lens 10 is in the first state, all the lenses in the imaging lens 10 or at least one lens in the imaging lens 10 near the image side can move along the optical axis, which changes the distance between the moved part or all of the lenses and the image sensor 20, thereby adjusting the focal length of the imaging lens 10. For example, it can realize the focusing or zooming functions of the imaging lens 10, and achieve better shooting results.

[0155] For example, see Figure 4 As shown, taking the movable configuration of all lenses in the imaging lens 10 as an example, that is, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16 and the seventh lens 17 can move along the optical axis toward or away from the image sensor 20 to change the focal length of the imaging lens 10 and realize focusing or zooming operations.

[0156] Of course, in some examples, at least one lens in the imaging lens 10 near the image side can be movable. For example, two lenses in the imaging lens 10 near the image side, such as the sixth lens 16 and the seventh lens 17, can be moved along the optical axis toward or away from the image sensor 20, which can also achieve adjustment of the focus.

[0157] To better achieve functions such as focusing or zooming, the imaging lens 10 can have a longer back focal length. This provides more room for movement, allowing all lenses or at least one lens near the image side to move within the long back focal length space. This enhances the flexibility of focusing or zooming, better meets the needs of focusing or zooming operations, further improves image quality and effect, and achieves high-definition shooting results.

[0158] Specifically, taking the length of the imaging lens on the optical axis as TTL1, and... Figure 4 Taking the seven-element imaging lens 10 as an example, see Figure 4 As shown, the actual length TTL1 of the imaging lens 10 on the optical axis is the distance on the optical axis L from the object side of the first lens 11 to the image side of the seventh lens 17.

[0159] Let the total optical length of the imaging lens 10 be TTL, where TTL is the distance on the optical axis L from the object side of the first lens 11 to the photosensitive surface of the image sensor 20. Let the back focal length of the imaging lens 10 be BFL, where BFL is the distance on the optical axis L from the image side of the seventh lens 17 to the photosensitive surface of the image sensor 20. In other words, the size of the back focal length BFL can be the difference between the total optical length TTL of the imaging lens 10 and the actual length TTL1 of the imaging lens 10.

[0160] When the imaging lens 10 is in the first state, the ratio of the length TTL1 of the imaging lens 10 to the total optical length TTL of the imaging lens 10 can be TTL1 / TTL≤0.85, making the length TTL1 of the imaging lens 10 and the total optical length TTL of the imaging lens 10 significantly different. This results in the imaging lens 10 having a longer back focal length in the first state, which facilitates the camera module 105 to perform focusing or zooming operations, improves the shooting effect of the camera module 105, ensures high-definition imaging effect, and enhances the resolution of the imaging lens 10, significantly improving the image quality.

[0161] It should be noted that in the actual layout of the imaging lens 10, the back focal length of the imaging lens 10 will be slightly greater than the difference between the total optical length and the actual length of the imaging lens 10, so as to facilitate the assembly of other structural components in the imaging lens 10.

[0162] Among them, the range of the back focal length BFL of the imaging lens 10 can be BFL≥1.2, ensuring that the imaging lens has a long back focal length, enabling the imaging lens to have a long overall optical length, guaranteeing the large-target high-quality imaging performance of the imaging lens, and facilitating the achievement of a high-definition shooting effect.

[0163] Taking the focal length of the imaging lens 10 as EFL, when the imaging lens 10 is in the first state, the overall optical length TTL of the imaging lens 10, the focal length EFL of the imaging lens 10, and the length TTL1 of the imaging lens 10 can satisfy TTL1<EFL<TTL. Under the condition of ensuring a certain focal length, the actual length of the imaging lens 10 is significantly lower than the overall optical length of the imaging lens 10, which facilitates the adjustment of the length between the imaging lens 10 (the image side of the Nth lens) and the image sensor 20, that is, facilitates the adjustment of the back focal length, and further facilitates the long back focal design of the imaging lens 10.

[0164] The imaging lens 10 formed by adopting the above architecture can balance the characteristics of large target surface, large aperture, high resolution, low overall length, etc. of the imaging lens 10 by reasonably selecting the refractive indices of each lens, matching the optical powers of each lens, and optimizing parameters such as the curvature radii and central thicknesses of each lens, so that the imaging lens 10 has better optical quality.

[0165] Among them, when the imaging lens 10 is in the first state, the overall optical length TTL of the imaging lens 10 and the semi-image height IMH of the imaging lens 10 can satisfy 0.5≤TTL / (2*IMH)≤0.7. Under the condition of ensuring a certain target surface, the overall optical length of the imaging lens 10 can be reduced, the low overall length characteristic of the imaging lens 10 can be achieved, and further the thinning design of the camera module 105 and the electronic device can be facilitated.

[0166] When the imaging lens is in the first state, the semi-image height IMH of the imaging lens 10 and the focal length EFL of the imaging lens 10 can satisfy 0.8≤IMH / EFL≤1.2. Under the condition of ensuring a certain focal length, the imaging target surface of the imaging lens 10 can be further increased, the large target surface characteristic of the imaging lens 10 can be achieved, so that the imaging lens 10 can be paired with an image sensor 20 with a large target surface size, and the large target surface imaging of the camera module 105 can be further realized, improving the imaging quality and effect.

[0167] When the imaging lens is in the first state, the range of the f-number F# of the imaging lens 10 can be 1.4≤F#≤2.2. The f-number F# is small and the aperture is large. Under the condition of ensuring high resolution, the large aperture characteristic of the imaging lens 10 is achieved, which further facilitates the improvement of the imaging quality and effect.

[0168] To further improve the imaging quality of the camera module 105, the molding material of the first lens 11 in the imaging lens 10 can be a low-dispersion material. For example, with the refractive index of the first lens 11 being Nd1 and the Abbe number of the first lens 11 being Vd1, the range of the refractive index Nd1 of the first lens 11 can be Nd1≤1.65, and the range of the Abbe number Vd1 of the first lens 11 can be Vd1≥50. This makes the first lens 11 a lens formed of a low-refractive-index, high-Abbe number material, which can effectively eliminate chromatic aberration and achieve optical performance with a large target area, large aperture, and high definition, thus improving the imaging quality and effect of the camera module 105.

[0169] With the focal length of the first lens 11 as f1, when the imaging lens is in the first state, the ratio of the focal length f1 of the first lens 11 to the focal length EFL of the imaging lens 10 can satisfy 1≤f1 / EFL≤1.5, which makes the optical power of the first lens 11 larger and the first lens 11 has a larger refractive power. The optical power is reasonably allocated, which not only further improves the imaging quality and effect, but also helps to reduce the total optical length of the imaging lens 10, and facilitates the thinning of the camera module 105 and electronic devices.

[0170] To further meet the thinning design requirements of camera modules and electronic devices, and to reduce the impact of long back focal length on the thickness of camera modules and electronic devices, all lenses of the imaging lens can be set in a movable manner. The switching between the first and second states of the imaging lens can be achieved by moving all the lenses.

[0171] Figure 5 This is a schematic diagram of the structure of an imaging lens in an electronic device in a first state, provided in an embodiment of this application. Figure 6 This is a schematic diagram of the structure of an imaging lens in an electronic device in a second state, provided as an embodiment of this application.

[0172] For example, the imaging lens can be movably fixed to the lens barrel, allowing all the lens elements (including the aperture stop) to move along the optical axis, enabling the imaging lens to move relative to the lens barrel (the housing of the electronic device) and the image sensor, etc., along the optical axis. (Refer to...) Figure 5 As shown, all the lenses of the imaging lens 10 can move along the optical axis L toward the image sensor 20 (towards the inside of the housing 101) or away from the image sensor 20 (towards the outside of the housing 101).

[0173] See Figure 5As shown, when the imaging lens 10 is in the first state, it has a relatively long back focal length, resulting in a relatively long overall optical length and a relatively long length of the entire camera module 105 along the optical axis L. Therefore, in the electronic device, when the imaging lens 10 is in the first state, at least a portion of the imaging lens 10 can extend beyond the housing 101 of the electronic device, reducing the impact of the long back focal length and long overall optical length of the imaging lens 10 on the thickness of the electronic device. This facilitates the reduction of the thickness of the electronic device while ensuring the optical performance of the imaging lens 10.

[0174] When the imaging lens 10 switches from the first state to the second state, all the lenses of the imaging lens 10 can move along the optical axis L. For example, all the lenses of the imaging lens 10 can move towards the image side along the optical axis L. That is, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16 and the seventh lens 17 all move towards the image sensor 20 along the optical axis L, which shortens the distance between the imaging lens 10 and the image sensor 20, thereby achieving the purpose of compressing the optical back focal length and reducing the total optical length of the imaging lens 10 in the second state. This also reduces the overall length of the camera module 105 on the optical axis (i.e., the thickness of the camera module).

[0175] Furthermore, since the imaging lens 10 has a long back focal length when it is in the first state, the long back focal length provides more compressible space when the imaging lens 10 switches from the first state to the second state, so that the imaging lens 10 has a smaller total optical length after movement, further reducing the thickness of the camera module 105.

[0176] See Figure 6 As shown, when the imaging lens 10 is in the second state, the imaging lens 10 is positioned closer to the image sensor 20. The optical back focal length and total optical length of the imaging lens 10 are smaller at this time, and the actual length of the imaging lens 10 is also smaller. This makes the overall length of the camera module 105 along the optical axis smaller, significantly reducing the thickness of the camera module 105. This results in an extremely thin camera module 105 in a non-working state (second state), reducing the space occupied by the camera module 105 in the thickness direction of the electronic device.

[0177] It is understandable that the image sensor 20 is located inside the housing 101. When the imaging lens 10 switches from the first state to the second state, the imaging lens 10 can move inward along the optical axis into the housing 101. The ultra-thin camera module 105 occupies little space in terms of the thickness of the electronic device. When the imaging lens 10 is in the second state, even if the entire camera module 105 is placed inside the internal space of the electronic device, it will not greatly restrict the thickness design of the electronic device, making it easier to achieve the thinning of the electronic device.

[0178] It should be noted that when the imaging lens 10 is in the second state, the entire camera module 105 can be located inside the housing 101 of the electronic device (see reference). Figure 6 (as shown), or, part of the imaging lens 10 may protrude outside the housing 101, that is, part of the imaging lens 10 may extend outside the housing 101, so as to further reduce the thickness of the electronic device.

[0179] Correspondingly, when the imaging lens 10 switches from the second state to the first state, the imaging lens 10 moves as a whole away from the image sensor 20, restoring the long back focal length and total optical length of the imaging lens 10, ensuring high imaging quality. The imaging lens 10 can move along the optical axis towards the outside of the electronic device housing 101, and when the imaging lens 10 is in the first state, at least a portion of the imaging lens 10 can be ejected outside the housing 101 (see...). Figure 5 (As shown).

[0180] In other words, in this embodiment, when the imaging lens 10 is in a non-working state (second state), the back focal length of the imaging lens 10 is compressed, the total optical length of the imaging lens 10 is reduced, and the length along the optical axis of the entire camera module 105 is smaller in the non-working state, thereby reducing the thickness of the camera module 105. The miniaturized camera module 105 can be partially or completely placed inside the housing 101 of the electronic device, which is convenient to meet the thinning design requirements of the electronic device and improve the user experience.

[0181] When the imaging lens 10 switches from a non-working state (second state) to a working state (first state), the imaging lens 10 can move along the optical axis in a direction away from the image sensor 20 and extend outside the housing 101, restoring the total optical length and long back focal length of the imaging lens 10. This achieves high-definition shooting effect of the camera module 105 while ensuring that the imaging lens 10 has a small actual length, which is beneficial for the thinning design of the camera module 105. This allows the camera module 105 to maintain excellent optical performance in the working state, achieving high imaging quality and effect, and possessing thinning characteristics. Furthermore, in the non-working state, its length can be further compressed, achieving further thinning of the camera module thickness.

[0182] It is understandable that the housing of an electronic device may have a light-entry hole, through which the imaging lens can move towards the outside or inside of the housing. In some examples, to meet the movement requirements of the imaging lens, the lens cover plate covering the light-entry hole can also be movable. For example, the lens cover plate can be movable on a decorative part, so that the lens cover plate can also move along the optical axis.

[0183] When the imaging lens switches from the second state to the first state, the lens cover can move along the optical axis and extend out of the housing to form a clearance space, increasing the spatial distance between the lens cover and the image sensor, so that the imaging lens can move within this clearance space, such as moving out of the housing, so that the imaging lens has a long back focal length when in working state, and this clearance space can also facilitate the movement of the lens to meet the focusing or zooming operation, ensuring imaging quality and effect.

[0184] Conversely, when the imaging lens switches from the first state to the second state, the imaging lens can move along the optical axis toward the inside of the housing, compressing the back focal length of the imaging lens. The lens cover can also move along the optical axis toward the inside of the housing, retracting the lens cover so that it covers the light inlet.

[0185] The camera module may also include a cover plate driving device, which can cooperate with the lens cover plate and can be used to drive the lens cover plate to move along the optical axis.

[0186] Of course, in some other examples, the lens cover may remain stationary, allowing the imaging lens to move freely while avoiding movement. For example, a clearance opening may be formed on the lens cover, through which the imaging lens can extend outside the housing or retract into the housing.

[0187] The camera module 105 may also include a lens driving device (not shown in the figure), such as a drive motor. The lens driving device can cooperate with the imaging lens 10 and is used to drive the lens of the imaging lens 10 to move along the optical axis to achieve switching of the imaging lens 10 between a first state and a second state. In some examples, the lens driving device can also drive the lens to move to achieve operations such as focusing or zooming.

[0188] It should be noted that, in this embodiment, there are many ways to move all the lenses of the imaging lens 10 along the optical axis. In this embodiment, there is no limitation on the specific movement of each lens of the imaging lens 10.

[0189] For example, all the lenses of the imaging lens 10 can be treated as a whole, and the lens drive device can drive the imaging lens 10 as a whole to move along the optical axis.

[0190] Alternatively, the lens driving device may include multiple lenses, each of which can cooperate with a portion of the lens in the imaging lens 10, and each lens driving device can drive the corresponding lens to move along the optical axis.

[0191] In this embodiment of the application, each lens with optical power in the imaging lens 10 can be an aspherical lens, so as to... Figure 6Taking the seven-element imaging lens 10 as an example, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16 and the seventh lens 17 are aspherical lenses. The imaging lens 10 includes 14 aspherical lenses, which can effectively eliminate aberrations and further improve imaging quality and effect.

[0192] Understandably, as electronic devices and camera modules become increasingly miniaturized, the number of lenses in an imaging lens should not be too large. In one example, when the imaging lens 10 includes only seven lenses, the structural design of the imaging lens 10 is relatively simple, and it is easy to achieve the characteristics of the imaging lens 10 such as large aperture, large target surface, long back focal length, and low total optical length and actual length.

[0193] In the aforementioned seven-element imaging lens 10, the optical power of the fifth lens 15 can be negative, further distributing the optical power of each lens to facilitate the achievement of high optical quality such as large aperture, large target surface, and long back focal length in the imaging lens 10.

[0194] It should be noted that the imaging lens provided in this embodiment may also include other lens arrangements and combinations, and is not limited to the above-described embodiments; the above-described embodiments are used as the basis for the description.

[0195] In this embodiment, the lenses of the imaging lens 10 can all be plastic lenses, or all lenses can all be glass lenses. Alternatively, some lenses can be plastic lenses and some lenses can be glass lenses; the specific materials can be selected and set according to actual needs.

[0196] The shapes of multiple lenses in the imaging lens 10 can be identical, or they can be different. The specific lens shape can be selected and set according to design requirements. For example, the lens shape can be circular or elliptical, which has a wide range of applications and is easy to implement in production.

[0197] The architecture and performance of the imaging lens and camera module provided in this application will be described below with reference to specific embodiments.

[0198] Example 1

[0199] Figure 7 This is a schematic diagram of the simulation structure of a camera module in the first state, as provided in Embodiment 1 of this application.

[0200] In this embodiment, see Figure 7As shown, the imaging lens 10 includes 7 lenses with optical power. For example, the imaging lens 10 may include a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16 and a seventh lens 17 arranged sequentially along the optical axis L from the object side to the image side.

[0201] In other words, along the optical axis L, from the object side to the image side, the camera module 105 contains, in sequence, an aperture stop 18, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, a filter 30, and an image sensor 20. Light entering the camera module 105 passes through the imaging lens 10 and the filter 30 in the aforementioned order and illuminates the image sensor 20, ultimately forming an image on the image sensor 20.

[0202] The first lens 11 may have positive optical power, and the object side of the first lens 11, at least the portion corresponding to the optical axis, may be convex, while the image side of the first lens 11, at least the portion corresponding to the optical axis, may be concave.

[0203] The second lens 12 may have negative optical power. The object side of the second lens 12, at least the portion corresponding to the optical axis, may be convex, and the image side of the second lens 12, at least the portion corresponding to the optical axis, may be concave.

[0204] The third lens 13 can have positive optical power, and the image side of the third lens 13, at least the part corresponding to the optical axis, can be convex.

[0205] The fourth lens 14 may have negative optical power, and the object side of the fourth lens 14, at least the portion corresponding to the optical axis, may be concave.

[0206] The fifth lens 15 can have negative optical power.

[0207] The sixth lens 16 can have positive optical power, and the image side of the sixth lens 16, at least the part corresponding to the optical axis, can be convex.

[0208] The seventh lens 17 can have negative optical power, and the object side of the seventh lens 17, at least the part corresponding to the optical axis, can be concave.

[0209] When the imaging lens 10 is in the first state, see Figure 7 As shown, there is a relatively long distance between the imaging lens 10 and the image sensor 20, and the imaging lens 10 has a long optical back focal length to ensure high-definition imaging. When the imaging lens 10 switches from the first state to the second state, the imaging lens 10 can move along the optical axis toward the image sensor 20 to compress the back focal length and reduce the length of the entire camera module 105 along the optical axis.

[0210] The length of the imaging lens 10 on the optical axis is TTL1 = 5.98 mm, the total optical length of the imaging lens 10 is TTL = 7.86 mm, and the ratio of the length TTL1 of the imaging lens 10 to the total optical length TTL of the imaging lens 10 satisfies TTL1 / TTL = 0.76.

[0211] The optical back focal length (BFL) of the imaging lens 10 is 1.88 mm.

[0212] The half-image height IMH of the imaging lens 10 is 6.25mm, and the length TTL1 of the imaging lens 10 and the half-image height of the imaging lens 10 satisfy TTL1 / (2*IMH) = 0.48.

[0213] The total optical length TTL of the imaging lens 10 and the half-image height of the imaging lens 10 satisfy TTL / (2*IMH)=0.63.

[0214] The focal length EFL of the imaging lens 10 is 6.45mm, and the half-image height IMH of the imaging lens 10 and the focal length of the imaging lens 10 satisfy IMH / EFL = 0.97.

[0215] The length TTL1 of the imaging lens 10, the focal length EFL of the imaging lens 10, and the total optical length TTL of the imaging lens 10 satisfy TTL1. <EFL<TTL。

[0216] The aperture number of the imaging lens 10 is F# = 1.6.

[0217] The refractive index of the first lens 11 is Nd1 = 1.55, and the Abbe number of the first lens 11 is Vd1 = 71.7.

[0218] The focal length f1 of the first lens 11 is 7.81 mm, and the focal length f1 of the first lens 11 and the focal length EFL of the imaging lens 10 satisfy f1 / EFL = 1.21.

[0219] Table 1.1 below shows the optical parameters of each lens in a camera module provided in Embodiment 1 of this application.

[0220]

[0221] Wherein, L1 is the first lens 11, L2 is the second lens 12, L3 is the third lens 13, L4 is the fourth lens 14, L5 is the fifth lens 15, L6 is the sixth lens 16, L7 is the seventh lens 17, and IR is the filter 30.

[0222] S1 and S2 are the object side and image side of the first lens 11, respectively; S3 and S4 are the object side and image side of the second lens 12, respectively; S5 and S6 are the object side and image side of the third lens 13, respectively; S7 and S8 are the object side and image side of the fourth lens 14, respectively; S9 and S10 are the object side and image side of the fifth lens 15, respectively; S11 and S12 are the object side and image side of the sixth lens 16, respectively; S13 and S14 are the object side and image side of the seventh lens 17, respectively; and S15 and S16 are the object side and image side of the filter 30, respectively.

[0223] R represents the radius of curvature of the object side or image side of each lens.

[0224] Th (mm) represents the inter-mirror thickness, which is the distance along the optical axis between a mirror and the next adjacent mirror in the direction from the object side to the image side. For example, the thickness corresponding to the aperture stop 18 is the distance along the optical axis from the aperture stop 18 to the object side of the first lens 11, the thickness corresponding to the object side of the first lens 11 is the thickness of the first lens 11 along the optical axis, the thickness corresponding to the image side of the first lens 11 is the distance along the optical axis from the image side of the first lens 11 to the object side of the second lens 12, and so on.

[0225] Nd represents the refractive index of each lens.

[0226] Vd represents the Abbe number of each lens.

[0227] Table 1.2 shows the focal length of each lens element in an imaging lens provided in Embodiment 1 of this application.

[0228] f1 f2 f3 f4 f5 f6 f7 7.81 -49.52 10.62 -24.35 -14.32 3.35 -3.11

[0229] Among them, f1, f2, f3, f4, f5, f6, and f7 are the focal lengths of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17, respectively.

[0230] Table 1.3 below shows the aspherical coefficients of each lens element in an imaging lens provided in Embodiment 1 of this application.

[0231]

[0232]

[0233] As shown in Table 1.3, all lenses in the imaging lens 10 are aspherical lenses, and the imaging lens 10 includes 14 aspherical surfaces. The aspherical surface shape z of each lens in the imaging lens 10 can be calculated using the following aspherical formula:

[0234]

[0235] Where z is the aspherical elevation, r is the radial coordinate of the aspherical surface, c is the spherical curvature at the vertex of the aspherical surface, K is the quadratic surface constant, i is the aspherical coefficient term (in this embodiment, i is 30), and Ai represents the i-th order aspherical coefficient. Based on the obtained aspherical surface shape, simulations can be performed on each lens to ultimately obtain... Figure 7 The camera module 105 shown.

[0236] The optical parameters of the camera module 105 composed of the above-mentioned lenses can be found in Table 1.4 below.

[0237] Table 1.4 shows the optical parameters of a camera module provided in Embodiment 1 of this application.

[0238]

[0239] As shown in Table 1.4, the imaging lens provided in Embodiment 1 of this application has a long back focal length and a small actual length. Furthermore, the imaging lens can achieve the characteristics of a large aperture and a large target surface, which is beneficial to improving the imaging quality and effect of the camera module.

[0240] Figure 8 This is a color difference curve diagram of a camera module provided in Embodiment 1 of this application. Figure 8 The chromatic aberration in the example refers to the axial chromatic aberration of light with wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm after passing through the imaging lens. The horizontal axis represents the magnitude of spherical aberration, and the vertical axis represents the normalized aperture. Figure 8 It can be seen that the chromatic aberration of the image formed after light passes through the imaging lens is relatively small.

[0241] Figure 9 This is a distortion curve diagram of a camera module provided in Embodiment 1 of this application. It represents the difference between the imaging distortion and that of an ideal system, reflecting the distortion status of the field of view. The horizontal axis represents the magnitude of distortion, and the vertical axis represents the field of view. Figure 9 It can be seen that the distortion across the entire field of view is controlled within 3%, the distortion of the image is small, and the image quality is high.

[0242] Example 2

[0243] Figure 10 This is a schematic diagram of the simulation structure of a camera module in the first state, as provided in Embodiment 2 of this application.

[0244] In this embodiment, see Figure 10As shown, the imaging lens 10 includes 7 lenses with optical power. The imaging lens 10 may include a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16 and a seventh lens 17 arranged sequentially along the optical axis L from the object side to the image side.

[0245] In other words, along the optical axis L, from the object side to the image side, the camera module 105 contains, in sequence, an aperture stop 18, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, a filter 30, and an image sensor 20. Light entering the camera module 105 passes through the imaging lens 10 and the filter 30 in the aforementioned order and illuminates the image sensor 20, ultimately forming an image on the image sensor 20.

[0246] The first lens 11 may have positive optical power, and the object side of the first lens 11, at least the portion corresponding to the optical axis, may be convex, while the image side of the first lens 11, at least the portion corresponding to the optical axis, may be concave.

[0247] The second lens 12 may have negative optical power. The object side of the second lens 12, at least the portion corresponding to the optical axis, may be convex, and the image side of the second lens 12, at least the portion corresponding to the optical axis, may be concave.

[0248] The third lens 13 can have positive optical power, and the image side of the third lens 13, at least the part corresponding to the optical axis, can be convex.

[0249] The fourth lens 14 may have negative optical power, and the object side of the fourth lens 14, at least the portion corresponding to the optical axis, may be concave.

[0250] The fifth lens 15 can have negative optical power.

[0251] The sixth lens 16 can have positive optical power, and the image side of the sixth lens 16, at least the part corresponding to the optical axis, can be convex.

[0252] The seventh lens 17 can have negative optical power, and the object side of the seventh lens 17, at least the part corresponding to the optical axis, can be concave.

[0253] When the imaging lens 10 is in the first state, see Figure 10 As shown, there is a relatively long distance between the imaging lens 10 and the image sensor 20, and the imaging lens 10 has a long optical back focal length to ensure high-definition imaging. When the imaging lens 10 switches from the first state to the second state, the imaging lens 10 can move along the optical axis toward the image sensor 20 to compress the back focal length and reduce the length of the entire camera module 105 along the optical axis.

[0254] The length of the imaging lens 10 on the optical axis is TTL1 = 6.83 mm, the total optical length of the imaging lens 10 is TTL = 8.12 mm, and the ratio of the length TTL1 of the imaging lens 10 to the total optical length TTL of the imaging lens 10 satisfies TTL1 / TTL = 0.84.

[0255] The optical back focal length (BFL) of the imaging lens 10 is 1.29 mm.

[0256] The half-image height IMH of the imaging lens 10 is 6.43 mm, and the length TTL1 of the imaging lens 10 and the half-image height of the imaging lens 10 satisfy TTL1 / (2*IMH) = 0.55.

[0257] The total optical length TTL of the imaging lens 10 and the half-image height of the imaging lens 10 satisfy TTL / (2*IMH)=0.63.

[0258] The focal length EFL of the imaging lens 10 is 6.68mm, and the half-image height IMH and the focal length of the imaging lens 10 satisfy IMH / EFL = 0.96.

[0259] The length TTL1 of the imaging lens 10, the focal length EFL of the imaging lens 10, and the total optical length TTL of the imaging lens 10 satisfy TTL1. <EFL<TTL。

[0260] The aperture of the imaging lens 10 is F# = 1.5.

[0261] The refractive index of the first lens 11 is Nd1 = 1.53, and the Abbe number of the first lens 11 is Vd1 = 56.

[0262] The focal length f1 of the first lens 11 is 7.94mm, and the focal length f1 of the first lens 11 and the focal length EFL of the imaging lens 10 satisfy f1 / EFL = 1.19.

[0263] Table 2.1 below shows the optical parameters of each lens in a camera module provided in Embodiment 2 of this application.

[0264]

[0265] Wherein, L1 is the first lens 11, L2 is the second lens 12, L3 is the third lens 13, L4 is the fourth lens 14, L5 is the fifth lens 15, L6 is the sixth lens 16, L7 is the seventh lens 17, and IR is the filter 30.

[0266] For a detailed illustration of S1-S16, please refer to Embodiment 1. It will not be repeated in this embodiment.

[0267] The meanings of parameters such as R, Th, Nd, and Vd can also be found in Example 1, and will not be repeated in this example.

[0268] Table 2.2 shows the focal length of each lens element in an imaging lens provided in Embodiment 2 of this application.

[0269] f1 f2 f3 f4 f5 f6 f7 7.94 -21.47 12.60 -20.84 -17.69 4.06 -3.64

[0270] Among them, f1, f2, f3, f4, f5, f6, and f7 are the focal lengths of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17, respectively.

[0271] Table 2.3 below shows the aspherical coefficients of each lens element in an imaging lens provided in Embodiment 2 of this application.

[0272]

[0273]

[0274] As shown in Table 2.3, all lenses in imaging lens 10 are aspherical lenses, and imaging lens 10 includes 14 aspherical surfaces. The aspherical surface shape z of each lens in imaging lens 10 can be calculated using the following aspherical formula:

[0275]

[0276] Where z is the aspherical elevation, r is the radial coordinate of the aspherical surface, c is the spherical curvature at the vertex of the aspherical surface, K is the quadratic surface constant, i is the aspherical coefficient term (in this embodiment, i is 30), and Ai represents the i-th order aspherical coefficient. Based on the obtained aspherical surface shape, simulations can be performed on each lens to ultimately obtain... Figure 10 The camera module 105 shown.

[0277] The optical parameters of the camera module 105 composed of the above-mentioned lenses can be found in Table 2.4 below.

[0278] Table 2.4 shows the optical parameters of a camera module provided in Embodiment 2 of this application.

[0279]

[0280] As shown in Table 2.4, the imaging lens 10 provided in Embodiment 2 of this application has a long back focal length and a small actual length. Furthermore, the imaging lens 10 can achieve the characteristics of a large aperture and a large target surface, which is beneficial to improving the imaging quality and effect of the camera module 105.

[0281] Figure 11 This is a color difference curve diagram of a camera module provided in Embodiment 2 of this application. Figure 11The chromatic aberration in the example refers to the axial chromatic aberration of light with wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm after passing through the imaging lens. The horizontal axis represents the magnitude of spherical aberration, and the vertical axis represents the normalized aperture. Figure 11 It can be seen that the chromatic aberration of the image formed after light passes through the imaging lens is relatively small.

[0282] Figure 12 This is a distortion curve diagram of a camera module provided in Embodiment 2 of this application. It represents the difference between the imaging distortion and that of an ideal system, reflecting the distortion status of the field of view. The horizontal axis represents the magnitude of distortion, and the vertical axis represents the field of view. Figure 12 It can be seen that the distortion across the entire field of view is controlled within 3%, the distortion of the image is small, and the image quality is high.

[0283] Example 3

[0284] Figure 13 This is a schematic diagram of the simulation structure of a camera module in the first state, as provided in Embodiment 3 of this application.

[0285] In this embodiment, see Figure 13 As shown, the imaging lens 10 includes 7 lenses with optical power. The imaging lens 10 may include a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16 and a seventh lens 17 arranged sequentially along the optical axis L from the object side to the image side.

[0286] In other words, along the optical axis L, from the object side to the image side, the camera module 105 contains, in sequence, an aperture stop 18, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, a filter 30, and an image sensor 20. Light entering the camera module 105 passes through the imaging lens 10 and the filter 30 in the aforementioned order and illuminates the image sensor 20, ultimately forming an image on the image sensor 20.

[0287] The first lens 11 may have positive optical power, and the object side of the first lens 11, at least the portion corresponding to the optical axis, may be convex, while the image side of the first lens 11, at least the portion corresponding to the optical axis, may be concave.

[0288] The second lens 12 may have negative optical power. The object side of the second lens 12, at least the portion corresponding to the optical axis, may be convex, and the image side of the second lens 12, at least the portion corresponding to the optical axis, may be concave.

[0289] The third lens 13 can have positive optical power, and the image side of the third lens 13, at least the part corresponding to the optical axis, can be convex.

[0290] The fourth lens 14 may have negative optical power, and the object side of the fourth lens 14, at least the portion corresponding to the optical axis, may be concave.

[0291] The fifth lens 15 can have negative optical power.

[0292] The sixth lens 16 can have positive optical power, and the image side of the sixth lens 16, at least the part corresponding to the optical axis, can be convex.

[0293] The seventh lens 17 can have negative optical power, and the object side of the seventh lens 17, at least the part corresponding to the optical axis, can be concave.

[0294] When the imaging lens 10 is in the first state, see Figure 13 As shown, there is a relatively long distance between the imaging lens 10 and the image sensor 20, and the imaging lens 10 has a long optical back focal length to ensure high-definition imaging. When the imaging lens 10 switches from the first state to the second state, the imaging lens 10 can move along the optical axis toward the image sensor 20 to compress the back focal length and reduce the length of the entire camera module 105 along the optical axis.

[0295] The length of the imaging lens 10 on the optical axis is TTL1 = 6.21 mm, the total optical length of the imaging lens 10 is TTL = 7.73 mm, and the ratio of the length TTL1 of the imaging lens 10 to the total optical length TTL of the imaging lens 10 satisfies TTL1 / TTL = 0.80.

[0296] The optical back focal length (BFL) of the imaging lens 10 is 1.52 mm.

[0297] The half-image height IMH of the imaging lens 10 is 6.46 mm, and the length TTL1 of the imaging lens 10 and the half-image height of the imaging lens 10 satisfy TTL1 / (2*IMH) = 0.50.

[0298] The total optical length TTL of the imaging lens 10 and the half-image height of the imaging lens 10 satisfy TTL / (2*IMH)=0.60.

[0299] The focal length EFL of the imaging lens 10 is 6.60mm, and the half-image height IMH and the focal length of the imaging lens 10 satisfy IMH / EFL = 0.98.

[0300] The length TTL1 of the imaging lens 10, the focal length EFL of the imaging lens 10, and the total optical length TTL of the imaging lens 10 satisfy TTL1. <EFL<TTL。

[0301] The aperture of the imaging lens 10 is F# = 1.8.

[0302] The refractive index of the first lens 11 is Nd1 = 1.53, and the Abbe number of the first lens 11 is Vd1 = 68.9.

[0303] The focal length f1 of the first lens 11 is 7.37mm, and the focal length f1 of the first lens 11 and the focal length EFL of the imaging lens 10 satisfy f1 / EFL = 1.12.

[0304] Table 3.1 below shows the optical parameters of each lens in a camera module provided in Embodiment 3 of this application.

[0305]

[0306]

[0307] Wherein, L1 is the first lens 11, L2 is the second lens 12, L3 is the third lens 13, L4 is the fourth lens 14, L5 is the fifth lens 15, L6 is the sixth lens 16, L7 is the seventh lens 17, and IR is the filter 30.

[0308] For a detailed illustration of S1-S16, please refer to Embodiment 1. It will not be repeated in this embodiment.

[0309] The meanings of parameters such as R, Th, Nd, and Vd can also be found in Example 1, and will not be repeated in this example.

[0310] Table 3.2 shows the focal length of each lens element in an imaging lens provided in Embodiment 3 of this application.

[0311] f1 f2 f3 f4 f5 f6 f7 7.37 -31.49 11.43 -15.31 -11.26 3.50 -3.34

[0312] Among them, f1, f2, f3, f4, f5, f6, and f7 are the focal lengths of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17, respectively.

[0313] Table 3.3 below shows the aspherical coefficients of each lens element in an imaging lens provided in Embodiment 3 of this application.

[0314]

[0315]

[0316] As shown in Table 3.3, all lenses in the imaging lens 10 are aspherical lenses, and the imaging lens 10 includes 14 aspherical surfaces. The aspherical surface shape z of each lens in the imaging lens 10 can be calculated using the following aspherical formula:

[0317]

[0318] Where z is the aspherical elevation, r is the radial coordinate of the aspherical surface, c is the spherical curvature at the vertex of the aspherical surface, K is the quadratic surface constant, i is the aspherical coefficient term (in this embodiment, i is 30), and Ai represents the i-th order aspherical coefficient. Based on the obtained aspherical surface shape, simulations can be performed on each lens to ultimately obtain... Figure 13 The camera module 105 shown.

[0319] The optical parameters of the camera module 105 composed of the above-mentioned lenses can be found in Table 3.4 below.

[0320] Table 3.4 shows the optical parameters of a camera module provided in Embodiment 3 of this application.

[0321]

[0322] As shown in Table 3.4, the imaging lens 10 provided in Embodiment 3 of this application has a long back focal length and a small actual length. Furthermore, the imaging lens 10 can achieve the characteristics of a large aperture and a large target surface, which is beneficial to improving the imaging quality and effect of the camera module 105.

[0323] Figure 14 This is a color difference curve diagram of a camera module provided in Embodiment 3 of this application. Figure 14 The chromatic aberration in the example refers to the axial chromatic aberration of light with wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm after passing through the imaging lens. The horizontal axis represents the magnitude of spherical aberration, and the vertical axis represents the normalized aperture. Figure 14 It can be seen that the chromatic aberration of the image formed after light passes through the imaging lens is relatively small.

[0324] Figure 15 This is a distortion curve diagram of a camera module provided in Embodiment 3 of this application. It represents the difference between the imaging distortion and that of an ideal system, reflecting the distortion status of the field of view. The horizontal axis represents the magnitude of distortion, and the vertical axis represents the field of view. Figure 15 It can be seen that the distortion across the entire field of view is controlled within 3%, the distortion of the image is small, and the image quality is high.

[0325] Example 3

[0326] Figure 16 This is a schematic diagram of the simulation structure of a camera module in the first state, as provided in Embodiment 4 of this application.

[0327] In this embodiment, see Figure 16 As shown, the imaging lens 10 includes 7 lenses with optical power. The imaging lens 10 may include a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16 and a seventh lens 17 arranged sequentially along the optical axis L from the object side to the image side.

[0328] In other words, along the optical axis L, from the object side to the image side, the camera module 105 contains, in sequence, an aperture stop 18, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, a filter 30, and an image sensor 20. Light entering the camera module 105 passes through the imaging lens 10 and the filter 30 in the aforementioned order and illuminates the image sensor 20, ultimately forming an image on the image sensor 20.

[0329] The first lens 11 may have positive optical power, and the object side of the first lens 11, at least the portion corresponding to the optical axis, may be convex, while the image side of the first lens 11, at least the portion corresponding to the optical axis, may be concave.

[0330] The second lens 12 may have negative optical power. The object side of the second lens 12, at least the portion corresponding to the optical axis, may be convex, and the image side of the second lens 12, at least the portion corresponding to the optical axis, may be concave.

[0331] The third lens 13 can have positive optical power, and the image side of the third lens 13, at least the part corresponding to the optical axis, can be convex.

[0332] The fourth lens 14 may have negative optical power, and the object side of the fourth lens 14, at least the portion corresponding to the optical axis, may be concave.

[0333] The fifth lens 15 can have negative optical power.

[0334] The sixth lens 16 can have positive optical power, and the image side of the sixth lens 16, at least the part corresponding to the optical axis, can be convex.

[0335] The seventh lens 17 can have negative optical power, and the object side of the seventh lens 17, at least the part corresponding to the optical axis, can be concave.

[0336] When the imaging lens 10 is in the first state, see Figure 16 As shown, there is a relatively long distance between the imaging lens 10 and the image sensor 20, and the imaging lens 10 has a long optical back focal length to ensure high-definition imaging. When the imaging lens 10 switches from the first state to the second state, the imaging lens 10 can move along the optical axis toward the image sensor 20 to compress the back focal length and reduce the length of the entire camera module 105 along the optical axis.

[0337] The length of the imaging lens 10 on the optical axis is TTL1 = 4.80 mm, the total optical length of the imaging lens 10 is TTL = 6.57 mm, and the ratio of the length TTL1 of the imaging lens 10 to the total optical length TTL of the imaging lens 10 satisfies TTL1 / TTL = 0.73.

[0338] The optical back focal length (BFL) of the imaging lens 10 is 1.77 mm.

[0339] The half-image height IMH of the imaging lens 10 is 6.44 mm, and the length TTL1 of the imaging lens 10 and the half-image height of the imaging lens 10 satisfy TTL1 / (2*IMH) = 0.38.

[0340] The total optical length TTL of the imaging lens 10 and the half-image height of the imaging lens 10 satisfy TTL / (2*IMH)=0.51.

[0341] The focal length EFL of the imaging lens 10 is 5.99mm, and the half-image height IMH and the focal length of the imaging lens 10 satisfy IMH / EFL = 1.08.

[0342] The length TTL1 of the imaging lens 10, the focal length EFL of the imaging lens 10, and the total optical length TTL of the imaging lens 10 satisfy TTL1. <EFL<TTL。

[0343] The aperture number of the imaging lens 10 is F# = 2.1.

[0344] The refractive index of the first lens 11 is Nd1 = 1.44, and the Abbe number of the first lens 11 is Vd1 = 95.1.

[0345] The focal length f1 of the first lens 11 is 6.88mm, and the focal length f1 of the first lens 11 and the focal length EFL of the imaging lens 10 satisfy f1 / EFL = 1.15.

[0346] Table 4.1 below shows the optical parameters of each lens in a camera module provided in Embodiment 4 of this application.

[0347]

[0348] Wherein, L1 is the first lens 11, L2 is the second lens 12, L3 is the third lens 13, L4 is the fourth lens 14, L5 is the fifth lens 15, L6 is the sixth lens 16, L7 is the seventh lens 17, and IR is the filter 30.

[0349] For a detailed illustration of S1-S16, please refer to Embodiment 1. It will not be repeated in this embodiment.

[0350] The meanings of parameters such as R, Th, Nd, and Vd can also be found in Example 1, and will not be repeated in this example.

[0351] Table 4.2 shows the focal length of each lens element in an imaging lens provided in Embodiment 4 of this application.

[0352] f1 f2 f3 f4 f5 f6 f7 6.89 -73.85 12.75 -18.74 -13.14 2.96 -2.63

[0353] Among them, f1, f2, f3, f4, f5, f6, and f7 are the focal lengths of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17, respectively.

[0354] Table 4.3 below shows the aspherical coefficients of each lens element in an imaging lens provided in Embodiment 4 of this application.

[0355]

[0356]

[0357] As shown in Table 4.3, all lenses in the imaging lens 10 are aspherical lenses, and the imaging lens 10 includes 14 aspherical surfaces. The aspherical surface shape z of each lens in the imaging lens 10 can be calculated using the following aspherical formula:

[0358]

[0359] Where z is the aspherical elevation, r is the radial coordinate of the aspherical surface, c is the spherical curvature at the vertex of the aspherical surface, K is the quadratic surface constant, i is the aspherical coefficient term (in this embodiment, i is 30), and Ai represents the i-th order aspherical coefficient. Based on the obtained aspherical surface shape, simulations can be performed on each lens to ultimately obtain... Figure 16 The camera module 105 shown.

[0360] The optical parameters of the camera module 105 composed of the above-mentioned lenses can be found in Table 4.4 below.

[0361] Table 4.4 shows the optical parameters of a camera module provided in Embodiment 4 of this application.

[0362]

[0363] As shown in Table 4.4, the imaging lens 10 provided in Embodiment 4 of this application has a long back focal length and a small actual length. Furthermore, the imaging lens 10 can achieve the characteristics of a large aperture and a large target surface, which is beneficial to improving the imaging quality and effect of the camera module 105.

[0364] Figure 17 This is a color difference curve diagram of a camera module provided in Embodiment 4 of this application. Figure 17 The chromatic aberration in the example refers to the axial chromatic aberration of light with wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm after passing through the imaging lens. The horizontal axis represents the magnitude of spherical aberration, and the vertical axis represents the normalized aperture. Figure 17 It can be seen that the chromatic aberration of the image formed after light passes through the imaging lens is relatively small.

[0365] Figure 18 This is a distortion curve diagram of a camera module provided in Embodiment 4 of this application. It represents the difference between the imaging distortion and that of an ideal system, reflecting the distortion status of the field of view. The horizontal axis represents the magnitude of distortion, and the vertical axis represents the field of view. Figure 18 It can be seen that the distortion across the entire field of view is controlled within 3%, the distortion of the image is small, and the image quality is high.

[0366] It should be noted that the numerical values ​​and ranges involved in the embodiments of this application are approximate values ​​and may have a certain range of errors, which can be considered negligible by those skilled in the art.

[0367] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances. The terms "first," "second," "third," "fourth," etc. (if present) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0368] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them. Although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An imaging lens, characterized in that, It includes at least N lenses arranged sequentially from the object side to the image side along the optical axis and each having an optical power, wherein N is greater than or equal to 6, and the N lenses are respectively the first lens, the second lens, the third lens, the fourth lens, ... the (N-1)th lens, and the Nth lens; The first lens has positive optical power, and the object side of the first lens is at least convex in the portion corresponding to the optical axis, and the image side of the first lens is at least concave in the portion corresponding to the optical axis. The second lens has negative optical power, and the object side of the second lens is at least convex in the portion corresponding to the optical axis, and the image side of the second lens is at least concave in the portion corresponding to the optical axis. The third lens has positive optical power, and at least the portion of the image side of the third lens corresponding to the optical axis is convex. The fourth lens has negative optical power, and the object side of the fourth lens is concave at least in the portion corresponding to the optical axis; The (N-1)th lens has positive optical power, and the image-side surface of the (N-1)th lens is convex at least in the portion corresponding to the optical axis. The Nth lens has negative optical power, and the object-side surface of the Nth lens is concave at least in the portion corresponding to the optical axis. When the imaging lens is in the first state, all the lenses in the imaging lens or at least one lens in the imaging lens that is close to the image side moves along the optical axis to adjust the focal length of the imaging lens. Furthermore, when the imaging lens is in the first state, the imaging lens satisfies the condition: TTL1 / TTL≤0.85, where TTL1 is the length of the imaging lens on the optical axis, and TTL is the total optical length of the imaging lens; The imaging lens also satisfies the condition: BFL≥1.2, where BFL is the back focal length of the imaging lens; The imaging lens also satisfies the condition: 0.35≤TTL1 / (2*IMH)≤0.6, where IMH is the half-image height of the imaging lens.

2. The imaging lens according to claim 1, characterized in that, All the lenses in the imaging lens move along the optical axis toward the image side and compress the back focal length, so that the imaging lens switches from the first state to the second state.

3. The imaging lens according to claim 1 or 2, characterized in that, The first lens satisfies the following conditions: Nd1≤1.65, Vd1≥50, where Nd1 is the refractive index of the first lens material and Vd1 is the Abbe number of the first lens material.

4. The imaging lens according to any one of claims 1-3, characterized in that, When the imaging lens is in the first state, the imaging lens also satisfies the condition: 0.5≤TTL / (2*IMH)≤0.

7.

5. The imaging lens according to any one of claims 1-4, characterized in that, When the imaging lens is in the first state, the imaging lens also satisfies the condition: 0.8≤IMH / EFL≤1.2, where EFL is the focal length of the imaging lens.

6. The imaging lens according to any one of claims 1-5, characterized in that, When the imaging lens is in the first state, the imaging lens also satisfies the condition: TTL1 <EFL<TTL。 7. The imaging lens according to any one of claims 1-6, characterized in that, When the imaging lens is in the first state, the imaging lens also satisfies the condition: 1.4≤F#≤2.2, where F# is the aperture number of the imaging lens.

8. The imaging lens according to any one of claims 1-7, characterized in that, When the imaging lens is in the first state, the first lens also satisfies the condition: 1≤f1 / EFL≤1.5, where f1 is the focal length of the first lens.

9. The imaging lens according to any one of claims 1-8, characterized in that, The imaging lens contains multiple aspherical lenses with optical power.

10. The imaging lens according to any one of claims 1-9, characterized in that, N=7, the N-1 lens is the sixth lens, the Nth lens is the seventh lens, the fifth lens is located between the fourth lens and the sixth lens, and the fifth lens has negative power.

11. A camera module, characterized in that, It includes at least an image sensor and an imaging lens as described in any one of claims 1-10, wherein the image sensor is located on the image-facing side of the imaging lens.

12. An electronic device, characterized in that, It includes a housing and the camera module as described in claim 11, wherein the camera module is disposed within the housing; When the imaging lens is in the first state, at least a portion of the imaging lens extends outside the housing; When the imaging lens switches from the first state to the second state, all the lenses of the imaging lens move along the optical axis toward the inside of the housing.

Images