A camera lens and a terminal device

Abstract

This application discloses a camera lens and a terminal device. The terminal device includes the aforementioned camera lens and can specifically be a mobile phone, camera, smartwatch, or other terminal device with imaging capabilities. In this application embodiment, the camera lens includes seven lenses. Except for the fourth lens, the other six lenses are configured as lenses with specific focal lengths and employ a specific surface shape combination. This achieves both high pixel count and a more compact imaging lens structure, enabling high pixel balance in miniaturized camera lenses. The camera lens in this application embodiment can be applied to small terminal devices.

Description

Technical Field

[0001] This application relates to the field of optical lenses, and more particularly to a camera lens and terminal device. Background Technology

[0002] In recent years, with the rapid development and widespread adoption of smartphones and other terminal devices, users have increasingly higher performance requirements for these devices. Among these, image quality is a crucial factor for users when evaluating the quality of terminal devices with camera capabilities.

[0003] Therefore, how to improve the imaging quality of terminal devices is also a concern for those skilled in the art during the design process of terminal devices. Summary of the Invention

[0004] This application provides a camera lens and a terminal device, wherein the camera lens has high imaging quality and small size.

[0005] This application provides a camera lens that can be applied to terminal devices with imaging functions, such as mobile phones, cameras, and smartwatches.

[0006] From the object side to the image side, the camera lens sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; among which,

[0007] The first lens has positive optical power. The object side of the first lens is convex near the optical axis, and the image side of the first lens is concave near the optical axis. This arrangement helps light from a large field of view to enter the first lens with a smaller incident angle and reduces the spherical aberration of the camera lens.

[0008] The second lens has negative optical power. The object side of the second lens is convex near the optical axis, and the image side of the second lens is concave near the optical axis. In this way, the optical power of the first lens can be balanced, which helps to correct aberrations and improve image quality.

[0009] The third lens has positive optical power, and the object side of the third lens is convex near the optical axis, which helps to correct astigmatism and improve image quality.

[0010] The fifth lens has negative optical power, and the image side of the fifth lens is concave near the optical axis, which helps to reduce the incident angle of light and reduce stray light.

[0011] The sixth lens has positive optical power. The object side of the sixth lens is convex near the optical axis, and the image side of the sixth lens is also convex near the optical axis. This helps to smoothly transition the light rays in the center and the periphery, reduces the sensitivity of the lens, and ensures the stability of the image quality.

[0012] The seventh lens has a negative optical power. The object side of the seventh lens near the optical axis is convex, and the image side of the seventh lens near the optical axis is concave. This balances the optical power distribution at the image side end of the camera lens, helps to shorten the back focal length, reduces the volume of the camera lens, and at the same time reduces aberration and improves the imaging quality.

[0013] For the total effective focal length f of the camera lens, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, and the aperture value FNO of the camera lens, the following parameters satisfy the following formula:

[0014] 2 < f1 / (f6 + f7) < 5.7;

[0015] 0.1 < |f / f3| + |f / f4| < 0.5;

[0016] The above settings of the focal lengths help to reasonably distribute the optical powers of the first lens, the third lens, the fourth lens, the sixth lens, and the seventh lens, reduce the lens aberration, and improve the imaging quality.

[0017] In the embodiments of the present application, it is further specified that 1.6 < FNO < 1.76. This helps the camera lens to obtain a larger aperture, which is beneficial to improving the imaging quality of the imaging system in low-light scenarios.

[0018] In the embodiments of the present application, the camera lens includes seven lenses. The other six lenses except the fourth lens are configured as lenses with specific optical powers and are combined with specific surface shapes, which can take into account high pixels and make the structure of the imaging lens more compact, that is, it can achieve a high-pixel balance of miniaturization of the camera lens. The camera lens in the embodiments of the present application can be applied to small terminal devices.

[0019] In some optional embodiments, half of the diagonal length ImgH of the effective pixel area on the imaging surface of the photographic lens and the aperture value Fno of the photographic lens satisfy the formula: ImgH / FNO > 2.9. This can make the imaging lens obtain a larger aperture and image surface size, which is beneficial to improving the imaging quality of the imaging system in low-light scenarios.

[0020] In some optional embodiments, for the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens, the following parameters satisfy the following formula: -6 < f1 / f6 - f2 / f7 < -1. This can effectively control the relationship between the effective focal lengths of the first lens, the second lens, the sixth lens, and the seventh lens, reasonably distribute the optical powers of the four lenses, thereby reducing the lens aberration and improving the imaging quality.

[0021] In some optional implementations, the distance TTL from the object side of the first lens to the imaging surface in the optical axis direction, the radius of curvature R11 of the object side of the first lens near the optical axis, and the radius of curvature R72 of the image side of the seventh lens near the optical axis satisfy the following formula: 7 < TTL / (R72 / R11) < 12. This can effectively balance the shapes of the lens incident and exit surfaces, which is beneficial to obtaining a smaller TTL, while reducing lens aberrations and improving imaging quality.

[0022] In some alternative implementations, the entrance pupil diameter (EPD) of the camera lens and the maximum half-field of view (HFOV) of the camera lens satisfy the following formula: EPD A tan(HFOV) > 2.8 allows the optical imaging lens to have a larger light-passing aperture, which is beneficial to improving the imaging effect of the optical imaging lens in dark environments.

[0023] In some alternative implementations, the distance TTL from the object side of the first lens of the camera lens to the imaging surface in the optical axis direction, and half the diagonal length ImgH of the effective pixel area on the imaging surface of the camera lens satisfy the following formula: TTL / ImgH<1.3, which can effectively reduce the TTL of the lens, thereby achieving module miniaturization.

[0024] In some optional implementations, the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens, the radius of curvature R11 of the object side of the first lens near the optical axis, and the radius of curvature R72 of the image side of the seventh lens near the optical axis satisfy the following formula: 4 < f1 / R11-f7 / R72<5.5. This can effectively constrain the effective focal length and lens shape of the first and seventh lenses, reasonably allocate the optical power of the two lenses, balance system aberrations, and thus improve the system imaging quality.

[0025] In some alternative implementations, the Abbe number Vd1 of the first lens satisfies the following formula: 50 < Vd1 < 85, which allows for more material choices for the first lens, reduces aberrations in conjunction with the imaging system, and improves the imaging quality of the system.

[0026] In some optional embodiments, the radius of curvature R11 of the object side of the first lens near the optical axis and the radius of curvature R12 of the image side of the first lens near the optical axis satisfy the following formula: 4 < (R11 + R12) / R11 < 6.5, which can effectively control the shape of the first lens, facilitate the smooth entry of incident light into the lens, introduce smaller aberrations, and improve the imaging quality of the system.

[0027] In some optional implementations, the distance DT23 between the image side of the second lens and the object side of the third lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis satisfy the following formula: 1 < (CT2 + CT3) / DT23 < 3.1. This can make the structural distribution of the second and third lenses more reasonable and facilitate the assembly of the imaging lens.

[0028] In some optional embodiments, the center thickness CT4 of the fourth lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy the following formula: 0.5 < (CT4 + CT5) / (CT6 + CT7) < 0.9, which can make the structure of the fourth, fifth, sixth, and seventh lenses more uniform and reasonable, and is beneficial to the processing and forming of the lenses.

[0029] In some optional embodiments, the maximum distance Sag61 from the intersection of the object side of the sixth lens and the optical axis to any point on the object side of the sixth lens in the optical axis direction, the maximum distance Sag72 from the intersection of the image side of the seventh lens and the optical axis to any point on the image side of the seventh lens in the optical axis direction, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy the following formula: 2.4 < |Sag61 / CT6| + |Sag72 / CT7| < 3.3. This makes the surface shape of the sixth and seventh lenses smoother, which is beneficial to the lens processing and shaping. At the same time, it can effectively balance the field curvature of the imaging lens.

[0030] In one example, the camera lens provided in this application embodiment also includes an aperture stop, which is disposed on the object side of the first lens for easy placement. Alternatively, the aperture stop can be disposed between the second and third lenses. The placement of the aperture stop can limit the range of the light beam, thereby balancing the difference in lens aperture before and after the aperture stop; furthermore, the placement of the aperture stop here can also enable the lens to have a larger aperture, so as to meet the performance requirements of a large aperture camera lens.

[0031] In one example, this application embodiment also provides a filter, which is disposed on the side of the seventh lens opposite to the sixth lens. The filter can filter out light beams of a specified wavelength band, thereby highlighting light beams of other wavelength bands, resulting in more vivid imaging. The aforementioned filter can be an infrared cutoff filter to filter out infrared light within the infrared region, thus reducing image distortion caused by infrared light and enabling the acquisition of higher quality color images.

[0032] In reality, there can be various types of filters, depending on the specific application scenario of the camera lens. For example, the filter can also be a monochrome filter, which increases the amount of light entering the camera to obtain a clearer image. This implementation is particularly suitable for use in low-light scenarios such as at night, for example, in night vision devices.

[0033] In one example, at least one of the first, second, third, fourth, fifth, sixth, and seventh lenses is an aspherical lens. The curvature of an aspherical lens varies from its center to its edge. Compared to a spherical lens with constant curvature, an aspherical lens has better curvature radius characteristics and adjustability, which helps reduce spherical aberration, improve focusing level, and mitigate distortion and astigmatism, thereby improving image quality. Furthermore, aspherical lenses reduce the total number of lenses required to obtain a given result, and also help reduce the overall weight and axial dimensions of the lens. As an example, the first, second, third, fourth, fifth, sixth, and seventh lenses can be aspherical lenses to improve lens aberrations and enhance image quality.

[0034] This application also provides a terminal device, which can be a mobile phone, camera, smartwatch, or other terminal device with imaging capabilities. It includes a main body and a camera module, the camera module including the camera lens described in any of the above embodiments. Since the camera lens in the first aspect has the aforementioned technical effects, the terminal device with that camera lens should also possess similar technical effects, and therefore will not be elaborated upon here. Attached Figure Description

[0035] Figure 1 A front view of a specific embodiment of the terminal device provided in this application;

[0036] Figure 2 for Figure 1 Rear view;

[0037] Figure 3 This is a schematic diagram of the structure of a first embodiment of the camera lens provided in this application.

[0038] Figure 4 for Figure 3 Field curvature characteristic curve of a mid-range camera lens;

[0039] Figure 5 for Figure 3 Distortion characteristics curve of a camera lens;

[0040] Figure 6 This is a schematic diagram of a second embodiment of the camera lens provided in this application.

[0041] Figure 7 for Figure 6 Field curvature characteristic curve of a mid-range camera lens;

[0042] Figure 8 for Figure 6 Distortion characteristics curve of a camera lens;

[0043] Figure 9 This is a schematic diagram of a third embodiment of the camera lens provided in this application.

[0044] Figure 10 for Figure 9 Field curvature characteristic curve of a mid-range camera lens;

[0045] Figure 11 for Figure 9 Distortion characteristics curve of a camera lens;

[0046] Figure 12 This is a schematic diagram of the fourth embodiment of the camera lens provided in this application.

[0047] Figure 13 for Figure 12 Field curvature characteristic curve of a mid-range camera lens;

[0048] Figure 14 for Figure 12 Distortion characteristics curve of a camera lens;

[0049] Figure 15 This is a schematic diagram of a fifth embodiment of the camera lens provided in this application.

[0050] Figure 16 for Figure 15 Field curvature characteristic curve of a mid-range camera lens;

[0051] Figure 17 for Figure 15 Distortion characteristics curve of a camera lens;

[0052] Figure 18 This is a schematic diagram illustrating a sixth embodiment of the camera lens provided in this application.

[0053] Figure 19 for Figure 18 Field curvature characteristic curve of a mid-range camera lens;

[0054] Figure 20 for Figure 18 Distortion characteristics curve of a camera lens;

[0055] Figure 21This is a structural schematic diagram of a seventh embodiment of the camera lens provided in this application.

[0056] Figure 22 for Figure 21 Field curvature characteristic curve of a mid-range camera lens;

[0057] Figure 23 for Figure 21 Distortion characteristics curve of a camera lens.

[0058] Figures 1-23 The annotations in the accompanying drawings are explained as follows:

[0059] 100 Terminal equipment, 101 Housing, 102 Display screen, 103 Camera module, 104 Protective lens;

[0060] L1 First lens, 11 Object side, L2 Second lens, L3 Second lens, L4 Fourth lens, L5 Fifth lens, L6 Sixth lens, L7 Seventh lens, L8 Filter, S-stop. Detailed Implementation

[0061] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0062] For ease of understanding, some of the technical terms involved in the embodiments of this application will be explained and described below.

[0063] The optical axis is the direction in which light rays travel through an optical system, and is referenced to the principal ray at the center of the field of view. For symmetrical transmission systems, it generally coincides with the rotation center line of the optical system.

[0064] Focal length, also known as focal length, is a measure of the convergence or divergence of light in an optical system. It refers to the distance from the optical center of a lens to the focal point when a distant object is focused onto the focal plane. For fixed-focus lenses, the position of their optical center is fixed, therefore the focal length is fixed.

[0065] Optical power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam; it characterizes the ability of an optical system to deflect light rays. When the refractive index of air is approximately assumed to be 1, optical power is generally expressed as the reciprocal of the image-side focal length.

[0066] Using the lens as a boundary, the side where the subject is located is called the object side, and the surface of the lens closest to the object side can be called the object-side surface. Using the lens as a boundary, the side where the image of the subject is located is called the image side, and the surface of the lens closest to the image side can be called the image-side surface.

[0067] This application provides a terminal device, which may include a handheld device, an in-vehicle device, a wearable device, a computing device, or other processing devices connected to a wireless modem. It may also include cellular phones, smartphones, personal digital assistant (PDA) computers, tablet computers, laptop computers, cameras, video recorders, cameras, smartwatches, smart wristbands, in-vehicle computers, and other terminal devices with imaging capabilities. This application does not impose special limitations on the specific form of the aforementioned terminal device; for ease of understanding, the following description uses a mobile phone as an example.

[0068] Please refer to Figure 1 and Figure 2 , Figure 1 This is a front view of a specific embodiment of the terminal device provided in this application. Figure 2 for Figure 1 Rear view.

[0069] like Figure 1 As shown, the terminal device 100 may include a housing 101, a display screen 102, and a camera module 103.

[0070] The housing 101 has a receiving space for accommodating various components of the terminal device 100, such as the battery, antenna, circuit board, and the aforementioned camera module 103. Simultaneously, the housing 101 also serves to protect the terminal device 100. The display screen 102 can be mounted on one side of the housing 101. In some embodiments, the housing 101 includes a back cover and a mid-frame, with the display screen 102 and camera module 103 fixed to the mid-frame, and the display screen 102 and back cover located on opposite sides of the mid-frame. The material of the housing 101 can include one or more of metal, plastic, ceramic, or glass.

[0071] The display screen 102 can be a liquid crystal display (LCD) screen, an organic light emitting diode (OLED) screen, etc., where the OLED screen can be a flexible screen or a rigid screen. The display screen 102 can be a non-foldable screen or a foldable screen. For example, the terminal device 100 also includes a hinge mechanism. Under the action of the hinge mechanism, the two main parts of the display screen 102 can be folded or unfolded relative to each other. When the display screen 102 is in the folded state, the section of the display screen 102 near the hinge mechanism can be folded into an arc shape, a spherical shape, or a teardrop shape. The display screen 102 can be disposed on the front of the terminal device 100, the back of the terminal device 100, or both the front and back of the terminal device 100. The front of the terminal device 100 can be understood as the side facing the user when using the terminal device 100, specifically as follows... Figure 1 As shown; the back of the terminal device 100 can be understood as the side facing away from the user when using the terminal device 100, specifically as follows: Figure 2 As shown.

[0072] Taking the front of the terminal device 100 as an example, in terms of its arrangement range, the display screen 102 can cover the entire area of ​​the front of the terminal device 100. The display screen 102 not only has a display function but also typically has a touch function, meaning that the terminal device 100 can be operated by clicking on the display screen 102. Alternatively, the display screen 102 can only cover a partial area of ​​the front of the terminal device 100. In this case, the display screen 102 can have a touch function or only a display function. When it only has a display function, the area of ​​the housing 101 where the display screen 102 is not located can be configured with corresponding buttons or other human-machine interface elements to operate the terminal device 100. These human-machine interface elements can be located anywhere on the front, back, or side of the terminal device 100.

[0073] The camera module 103 is used to capture still images or videos. When the camera module 103 is disposed on the front of the terminal device 100, it can be used to capture scenes located on one side of the front of the terminal device 100. In some embodiments, the front-facing camera module 103 can be referred to as a front-facing camera. When the camera module 103 is disposed on the back of the terminal device 100, it can be used to capture scenes located on one side of the back of the terminal device 100. In some embodiments, the rear-facing camera module 103 can be referred to as a rear-facing camera. During shooting, the user can select the appropriate camera module 103 according to the shooting needs. The camera module 103 can be used to capture scenes at different distances, such as far away, near, or macro. This application embodiment does not impose any special limitations.

[0074] It should be understood that Figure 1 The installation position of the camera module 103 is merely illustrative. When the camera module 103 is used as a front-facing camera, the display screen 102 typically needs to have a light-passing hole to allow external light to enter the camera module 103. The front-facing camera can be installed in a suitable position, such as the left side of the earpiece, the upper middle of the terminal device 100, the lower part (or chin) of the terminal device 100, or the four corners of the terminal device 100. When the camera module 103 is used as a rear-facing camera, it can be installed in any position on the back of the terminal device 100, such as the upper left or upper right corner. In some other embodiments, the camera module 103 may not be installed on the main body of the terminal device 100, but on an edge protruding from the main body of the terminal device 100, or on a movable or rotatable component relative to the main body of the terminal device 100, which can extend, retract, or rotate from the main body of the terminal device 100. When the camera module 103 can rotate relative to the terminal device 100, the camera module 103 functions as both a front-facing camera and a rear-facing camera. That is, by rotating the same camera module 103, it can capture images from both the front and back sides of the terminal device 100. In other embodiments, for a foldable terminal device 100, when the display screen 102 can be folded, the camera module 103 can function as either a front-facing camera or a rear-facing camera as the display screen 102 folds.

[0075] This application embodiment does not limit the number of camera modules 103; it can be one, two, four, or even more. For example, one or more camera modules 103 can be set on the front of the terminal device 100, and / or one or more camera modules 103 can be set on the back of the terminal device 100. When multiple camera modules 103 are set, the multiple camera modules 103 can be completely identical or different. For example, the multiple camera modules 103 may have different lens optical parameters, different lens placement positions, different lens shapes, etc. This application embodiment also does not limit the relative positions of the multiple camera modules.

[0076] In this embodiment, the terminal device 100 may further include a protective lens 104 for protecting the camera module 103. The protective lens 104 is disposed on the housing 101 and covers the camera module 103. When the protective lens 104 is used to protect the front-facing camera, it may cover only the front-facing camera module or cover the entire front of the terminal device 100. When the protective lens 104 covers the entire front of the terminal device 100, it can simultaneously protect both the front-facing camera module and the display screen 102. The protective lens 104 is a cover glass (CG). When the protective lens 104 is used to protect the rear-facing camera, it may cover the entire back of the terminal device 100 or be disposed only at the corresponding position on the rear-facing camera module. The material of the protective lens 104 may be glass, sapphire, ceramic, etc., and this embodiment does not impose any special limitations. In some embodiments, the protective lens 104 is transparent, allowing external light from the terminal device 100 to pass through the protective lens 104 and enter the camera module 103.

[0077] in, Figure 1 The structure shown does not constitute a specific limitation on the terminal device 100. The terminal device 100 may include more or fewer components than shown in the figure. For example, the terminal device 100 may also include one or more components such as a battery, flash, fingerprint recognition module, earpiece, buttons, and sensors. The terminal device 100 may also have a different component arrangement than shown in the figure. For ease of understanding, all components in the terminal device 100 except for the camera module 103 can be referred to as the body. The camera module 103 can be installed on the body.

[0078] A camera module typically includes a lens group consisting of multiple lenses as the camera lens. A motor assembly can move the lens barrel, which is fixed to the lens group, a certain distance or rotate it a certain angle, enabling autofocus and / or optical image stabilization. In addition to lenses, the camera lens also includes an aperture, which limits the range of light. The aperture is usually a small aperture formed by overlapping leaf blades inside the camera lens. Adjusting its opening and closing degree adjusts the amount of light received by the image sensor. The larger the aperture opening, the more light passes through; the smaller the aperture opening, the less light passes through. The size of the aperture opening is measured by the aperture value FNO. A larger FNO value indicates a smaller aperture, and a smaller FNO value indicates a larger aperture. Generally, under the same conditions, a larger aperture indicates that the camera lens can adapt to more types of environments, and correspondingly, the image quality of the camera lens is considered to be higher. As the internal structure of terminal devices becomes increasingly compact, how to improve image quality in different environments while miniaturizing the camera lens has become a technical problem that the industry is currently trying to solve.

[0079] This application provides a camera lens with an FNO value between 1.6 and 1.76 (inclusive), and the camera lens occupies a relatively small space, that is, the camera lens takes into account both the miniaturization design requirements of the camera and high imaging quality.

[0080] This application provides a camera lens, which, in the direction from the object side to the image side, sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens is the lens closest to the object (or the subject), and the seventh lens is the lens closest to the imaging surface (or sensor chip).

[0081] In this embodiment, the first lens has positive optical power and can converge light rays. The object-side surface of the first lens is convex near the optical axis, and the image-side surface is concave near the optical axis; that is, the object-side surface near the optical axis protrudes along the optical axis, and the image-side surface near the optical axis is concave along the optical axis. This arrangement helps light rays with a large field of view enter the first lens with a smaller angle of incidence and reduces spherical aberration of the camera lens.

[0082] It should be noted that the “near optical axis” of a lens surface described in this application refers to a portion of the surface in the near optical axis region. Even if the “near optical axis” of the surface is convex, the edge or other locations of the surface may be concave.

[0083] In this embodiment, the second lens has a negative optical power to further correct the path of light introduced by the first lens. The object-side surface of the second lens is convex near the optical axis, and the image-side surface is concave near the optical axis. This balances the optical power of the first lens, helps correct aberrations, and improves image quality.

[0084] In this embodiment, the third lens has positive optical power, and the object side of the third lens is convex near the optical axis, which helps to correct astigmatism and improve imaging quality.

[0085] In this embodiment, the fourth lens has optical power. In some embodiments, the fourth lens can be positive or negative power, and the shapes of the object-side and image-side near the optical axis of the fourth lens can be reasonably selected. The fourth lens can optimize chromatic aberration and improve lens performance.

[0086] In this embodiment, the fifth lens has negative optical power, and the image-side surface of the fifth lens near the optical axis is concave; the shape of the object-side surface of the second lens near the optical axis can be reasonably selected, and it can be either concave or convex. This helps to reduce the incident angle of light and reduce stray light.

[0087] In an embodiment of the present application, the sixth lens has a positive optical power. The object side surface of the sixth lens is convex near the optical axis, and the image side surface of the sixth lens is convex near the optical axis. This helps the central and peripheral light rays to transition smoothly, reduces the sensitivity of the lens, and ensures the stability of the imaging quality.

[0088] In an embodiment of the present application, the seventh lens has a negative optical power. The object side surface of the seventh lens is convex near the optical axis, and the image side surface of the seventh lens is concave. This balances the optical power distribution at the image side end of the camera lens, helps to shorten the back focal length, and reduces the volume of the camera lens. At the same time, it reduces aberration and improves the imaging quality.

[0089] In an embodiment of the present application, the total effective focal length of the camera lens is f, the effective focal length of the first lens is f1, the effective focal length of the third lens is f3, the effective focal length of the fourth lens is f4, the effective focal length of the sixth lens is f6, and the effective focal length of the seventh lens is f7. The aperture value of the camera lens is FNO. The above parameters satisfy the following formula:

[0090] 2 < f1 / (f6 + f7) < 5.7;

[0091] 0.1 < |f / f3| + |f / f4| < 0.5;

[0092] 1.6 < FNO < 1.76.

[0093] Among them, by limiting the focal lengths of the relevant lenses through the formulas 2 < f1 / (f6 + f7) < 5.7 and 0.1 < |f / f3| + |f / f4| < 0.5, this helps to reasonably distribute the optical powers of the first lens, the third lens, the fourth lens, the sixth lens, and the seventh lens, reduce lens aberration, and improve the imaging quality. [[ID=q19]]

[0094] In an embodiment of the present application, it is further limited that 1.6 < FNO < 1.76. This helps the camera lens to obtain a larger aperture, which is beneficial to improving the imaging quality of the imaging system in low-light scenarios.

[0095] In an embodiment of the present application, the camera lens includes seven lenses. By configuring the other six lenses except the fourth lens as lenses with specific focal powers and adopting a specific surface shape combination, it can take into account high pixels and make the imaging lens structure more compact, that is, it can achieve a high-pixel balance of miniaturization of the camera lens. The camera lens in an embodiment of the present application can be applied to the small terminal device 100.

[0096] Each of the above-mentioned first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens may include at least one lens. When including multiple lenses, the lenses can be adhesively connected to form a lens group with specific parameters and specific shapes, so as to simplify the processing process of the lens group.

[0097] As an example, the first, second, third, fourth, fifth, sixth, and seventh lenses may each consist of only one lens. At least one of the first, second, third, fourth, fifth, sixth, and seventh lenses may be an aspherical lens. An aspherical lens has a varying curvature from its center to its edge. Compared to a spherical lens with constant curvature, an aspherical lens has better curvature radius characteristics and adjustability, which helps reduce spherical aberration, improve focusing level, and mitigate distortion and astigmatism, thereby improving image quality. Furthermore, aspherical lenses reduce the total number of lenses required to obtain a given result, and also help reduce the overall weight and axial dimensions of the lens. As an example, the first, second, third, fourth, fifth, sixth, and seventh lenses may be aspherical lenses to improve lens aberrations and enhance image quality.

[0098] The camera lens provided in this application embodiment may further include an aperture stop, which can be disposed on the object side of the first lens, resulting in a simple structure. The aperture stop may also be disposed between the first and second lenses; the specific distance between the aperture stop and the first and second lenses is not limited here, and those skilled in the art can design it as needed in practical applications. The aperture stop between the first and second lenses can limit the range of the light beam, thereby balancing the difference in lens aperture before and after the aperture stop. Furthermore, the aperture stop disposed between the first and second lenses can enable the lens to have a larger aperture, thus achieving the large aperture performance requirement of a camera lens.

[0099] The camera lens provided in this application embodiment may further include a filter, which may be disposed on the side of the seventh lens opposite to the sixth lens. The filter can filter out light beams of a specified wavelength, thereby highlighting light beams of other wavelengths, resulting in more vivid imaging.

[0100] Here, the embodiments of this application do not limit the type of filter. In practice, those skilled in the art can configure it according to actual needs. For example, the filter can be an infrared cut-off filter to filter out infrared light in the infrared region, thereby reducing image distortion caused by infrared light and enabling the acquisition of higher quality color images; or, the filter can also be a monochrome filter, which can increase the amount of light entering the filter to obtain a clearer image. This implementation is particularly suitable for use in low-light scenarios such as at night.

[0101] Regarding the camera lenses involved in the above-described embodiments, the following embodiments of this application will also provide preferred conditions for some parameters of the camera lenses in order to further improve the performance of the camera lenses involved in the embodiments of this application.

[0102] In some optional embodiments, ImgH, which is half of the diagonal length of the effective pixel area on the imaging surface of the photographic lens, and the aperture value Fno of the photographic lens satisfy the formula: ImgH / FNO > 2.9. This allows the imaging lens to obtain a larger aperture and image surface size, which is beneficial to improving the imaging quality of the imaging system in low-light scenarios.

[0103] In some optional embodiments, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy the following formula: -6 < f1 / f6 - f2 / f7 < -1. This can effectively control the relationship between the effective focal lengths of the first lens, the second lens, the sixth lens, and the seventh lens, and reasonably distribute the optical powers of the four lenses, thereby reducing lens aberration and improving imaging quality.

[0104] In some optional embodiments, the distance TTL from the object side surface of the first lens of the camera lens to the imaging surface in the optical axis direction, the curvature radius R11 at the near-optical axis of the object side surface of the first lens, and the curvature radius R72 at the near-optical axis of the image side surface of the seventh lens satisfy the following formula: 7 < TTL / (R72 / R11) < 12. This can effectively balance the shapes of the incident surface and the exit surface of the lens, which is beneficial to obtaining a smaller TTL, while reducing lens aberration and improving imaging quality.

[0105] In some optional embodiments, the entrance pupil diameter EPD of the camera lens and the maximum half-field-of-view angle HFOV of the camera lens satisfy the following formula: EPD tan(HFOV) > 2.8. This allows the optical imaging lens to have a larger light transmission aperture, which is beneficial to improving the imaging effect of the optical imaging lens in a dark environment.

[0106] In some optional embodiments, the distance TTL from the object side surface of the first lens of the camera lens to the imaging surface in the optical axis direction, and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the camera lens satisfy the following formula: TTL / ImgH < 1.3. This can effectively reduce the TTL of the lens, thereby achieving miniaturization of the module.

[0107] In some optional embodiments, the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens, the curvature radius R11 at the near-optical axis of the object side surface of the first lens, and the curvature radius R72 at the near-optical axis of the image side surface of the seventh lens satisfy the following formula: 4 < f1 / R11 - f7 / R72 < 5.5. This can effectively constrain the effective focal lengths and lens shapes of the first lens and the seventh lens, reasonably distribute the optical powers of the two lenses, and balance the system aberration, thereby improving the system imaging quality.

[0108] In some alternative implementations, the Abbe number Vd1 of the first lens satisfies the following formula: 50 < Vd1 < 85, which allows for more material choices for the first lens, reduces aberrations in conjunction with the imaging system, and improves the imaging quality of the system.

[0109] In some optional embodiments, the radius of curvature R11 of the object side of the first lens near the optical axis and the radius of curvature R12 of the image side of the first lens near the optical axis satisfy the following formula: 4 < (R11 + R12) / R11 < 6.5, which can effectively control the shape of the first lens, facilitate the smooth entry of incident light into the lens, introduce smaller aberrations, and improve the imaging quality of the system.

[0110] In some optional implementations, the distance DT23 between the image side of the second lens and the object side of the third lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis satisfy the following formula: 1 < (CT2 + CT3) / DT23 < 3.1. This can make the structural distribution of the second and third lenses more reasonable and facilitate the assembly of the imaging lens.

[0111] In some optional embodiments, the center thickness CT4 of the fourth lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy the following formula: 0.5 < (CT4 + CT5) / (CT6 + CT7) < 0.9. This makes the structure of the fourth, fifth, sixth, and seventh lenses more uniform and reasonable, which is beneficial to the processing and forming of the lenses.

[0112] In some optional embodiments, the maximum distance Sag61 from the intersection of the object side of the sixth lens and the optical axis to any point on the object side of the sixth lens in the optical axis direction, the maximum distance Sag72 from the intersection of the image side of the seventh lens and the optical axis to any point on the image side of the seventh lens in the optical axis direction, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy the following formula: 2.4 < |Sag61 / CT6| + |Sag72 / CT7| < 3.3. This makes the surface shape of the sixth and seventh lenses smoother, which is beneficial to the lens processing and shaping. At the same time, it can effectively balance the field curvature of the imaging lens.

[0113] In some optional implementations, the total effective focal length f of the camera lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy the following formula: 0.1 < |f / f3| + |f / f4| < 0.5. This reasonable allocation of the optical power of the third and fourth lenses is conducive to the smooth transition of light in the middle of the lens, balancing system aberrations and improving the system imaging quality.

[0114] In summary, the embodiments of this application employ seven lenses and, in conjunction with the aforementioned design conditions, through reasonable allocation of optical power and optimization of optical performance, can further enhance the large aperture of the lens and possess advantages such as compact structure and high image quality.

[0115] This application embodiment also provides a filter, which is disposed on the side of the seventh lens opposite to the sixth lens. The filter can filter out light beams of a specified wavelength band, thereby highlighting light beams of other wavelength bands, resulting in a more vivid image. The aforementioned filter can be an infrared cutoff filter to filter out infrared light within the infrared region, thus reducing image distortion caused by infrared light and enabling the acquisition of higher quality color images. In fact, the type of filter can be diverse, depending on the specific application scenario of the camera lens. For example, the filter can also be a monochromatic filter, which can increase the amount of light entering the lens to obtain a clearer image. This implementation is particularly suitable for use in low-light scenarios such as at night, such as in night vision devices.

[0116] The following embodiments of this application will also illustrate several specific examples of camera lenses that meet the above conditions with reference to the accompanying drawings.

[0117] Example 1

[0118] Please refer to Figures 3-5 , Figure 3 This is a schematic diagram of the structure of a first embodiment of the camera lens provided in this application. Figure 4 for Figure 3 Field curvature characteristic curve of a mid-range camera lens. Figure 5 for Figure 3 Distortion characteristics curve of a camera lens.

[0119] like Figure 3 As shown, from the object side to the image side, the camera lens of this embodiment includes a direction from the object side to the image side. The camera lens sequentially includes an aperture stop S, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter L8. The first lens L1, the third lens L3, and the sixth lens L6 all have positive optical power, while the second lens L2, the fourth lens L4, the fifth lens L5, and the seventh lens L7 all have negative optical power.

[0120] The concavity / convexity of each lens near the optical axis is as follows: the object-side surface of the first lens L1 is convex, and the image-side surface is concave; the object-side surface of the second lens L2 is convex, and the image-side surface is concave; both the object-side and image-side surfaces of the third lens L3 are convex; both the object-side and image-side surfaces of the fourth lens L4 are concave; both the object-side and image-side surfaces of the fifth lens L5 are convex; both the object-side and image-side surfaces of the sixth lens L6 are convex; and both the object-side and image-side surfaces of the seventh lens L7 are convex and concave. Filter L8 can be an infrared cut-off filter.

[0121] Table 1 below shows the relevant parameters of each lens in Embodiment 1, where the units for radius of curvature, thickness, and focal length are all mm. As can be seen from Table 1, the first lens L13 to the seventh lens L7 in Embodiment 1 are all aspherical lenses. The surface shape x of each aspherical lens can be calculated using the following formula (not limited to):

[0122]

[0123] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the coefficients k, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used on the object side / image side of each aspherical lens in Example 1.

[0124] Table 1. Parameters of the aperture, lens groups, and filters in Example 1

[0125]

[0126] Among them, the first lens L1 has an object-side surface L1S1 and an image-side surface L1S2, the second lens L2 has an object-side surface L2S1 and an image-side surface L2S2, the third lens L3 has an object-side surface L3S1 and an image-side surface L3S2, the fourth lens L4 has an object-side surface L4S1 and an image-side surface L4S2, the fifth lens L5 has an object-side surface L5S1 and an image-side surface L5S2, the sixth lens L6 has an object-side surface L6S1 and an image-side surface L6S2, the seventh lens L7 has an object-side surface L7S1 and an image-side surface L7S2, and the filter L8 has an object-side surface L8S1 and an image-side surface L8S2.

[0127] Table 2-1 Coefficients of each surface of the first to fourth lenses in Example 1

[0128]

[0129] Table 2-2 Coefficients of each surface of the fifth to seventh lenses in Example 1

[0130]

[0131] Table 3. Numerical table of parameters and condition formulas for the camera lens in Example 1.

[0132]

[0133] Table 3 above shows the numerical values ​​of the conditional formulas for the camera lens involved in Embodiment 1. As can be seen from Table 3, the values ​​of each conditional formula in this embodiment are all within the aforementioned set range. Furthermore, the FNO value is only 1.63, which allows for a relatively large aperture.

[0134] Figure 4 The field curvature characteristic curves of the camera lens are shown, where the dashed line represents the meridional field curve and the solid line represents the sagittal field curve. Figure 5 The distortion characteristic curves of the camera lens are shown, representing the distortion magnitude corresponding to different image heights. As can be seen from the figure, the distances between the sagittal and meridional curves are relatively close, indicating low astigmatism. Therefore, the camera lens provided in this embodiment exhibits good image quality.

[0135] Example 2

[0136] Please refer to Figures 6-8 , Figure 6 This is a schematic diagram of the structure of the second embodiment 6 of the camera lens provided in this application. Figure 7 for Figure 9 Field curvature characteristic curve of a mid-range camera lens. Figure 8 for Figure 7 Distortion characteristics curve of a camera lens.

[0137] like Figure 6 As shown, this application provides a second implementation method, which has the same number of lenses as the first embodiment described above, and will not be repeated here. The difference is that in this embodiment, the fourth lens L4 has positive optical power, while the optical powers of the other lenses are the same as in the first embodiment.

[0138] The concavity / convexity of each lens near the optical axis is as follows: the object-side surface of the first lens L1 is convex and the image-side surface is concave; the object-side surface of the second lens L2 is convex and the image-side surface is concave; the object-side surface of the third lens L3 is convex and both the image-side surface is concave; the object-side surface of the fourth lens L4 is concave and the image-side surface is convex; the object-side surface of the fifth lens L5 is convex and both the image-side surface is concave; the object-side surface and the image-side surface of the sixth lens L6 are both convex; and the object-side surface of the seventh lens L7 is convex and the image-side surface is concave.

[0139] Table 4 below shows the relevant parameters of each lens in Embodiment 2. The units for radius of curvature, thickness, and focal length are all mm. As can be seen from Table 4, the first to seventh lenses in Embodiment 2 are all aspherical lenses. Filter L8 is an infrared cutoff filter. Tables 5-1 and 5-2 below give the coefficients k, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 for the object-side / image-side surfaces that can be used for each aspherical lens in Embodiment 2.

[0140] Table 4. Parameters of the aperture, lenses, and filters in Example 2

[0141]

[0142] Table 5-1 Coefficients of the first to fourth lenses in Example 2

[0143]

[0144] Table 5-2 Coefficients of the fifth to seventh lenses in Example 2

[0145]

[0146] Table 6. Numerical table of parameters and condition formulas for the camera lens in Example 2.

[0147]

[0148] Table 6 above shows the numerical values ​​of the conditional formulas for the camera lens involved in Embodiment 1. As can be seen from Table 6, the values ​​of each conditional formula in this embodiment are all within the aforementioned setting range.

[0149] Figure 7 The field curvature characteristic curves of the camera lens are shown, where the dashed line represents the meridional field curve and the solid line represents the sagittal field curve. Figure 8 The distortion characteristic curve of the camera lens is shown, indicating the distortion magnitude corresponding to different image heights. As can be seen from the figure, the camera lens provided in this embodiment has good image quality.

[0150] Example 3

[0151] Please refer to Figures 9-11 , Figure 9 This is a schematic diagram of a third embodiment of the camera lens provided in this application. Figure 10 for Figure 9 Field curvature characteristic curve of a mid-range camera lens. Figure 11 for Figure 9 Distortion characteristics curve of a camera lens.

[0152] like Figure 9As shown, this application provides a third implementation method, which is the same as the first embodiment in terms of the number of lenses and optical power, and will not be described again here.

[0153] The concavity / convexity of each lens near the optical axis is as follows: the object-side surface of the first lens L1 is convex and the image-side surface is concave; the object-side surface of the second lens L2 is convex and the image-side surface is concave; both the object-side and image-side surfaces of the third lens L3 are convex; the object-side surface of the fourth lens L4 is convex and the image-side surface is concave; both the object-side and image-side surfaces of the fifth lens L5 are concave; both the object-side and image-side surfaces of the sixth lens L6 are convex; and the object-side surface of the seventh lens L7 is convex and the image-side surface is concave. The difference from the first embodiment lies in the different structures of the fourth lens L4 and the fifth lens L5; the structures of the remaining lenses are the same.

[0154] Table 7 below shows the relevant parameters of each lens in Example 3. The units for radius of curvature, thickness, and focal length are all mm. As can be seen from Table 7, all lenses in Example 3 are aspherical lenses, and filter L8 is an infrared cutoff filter. Tables 8-1 and 8-2 below give the coefficients k, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 for the object-side / image-side surfaces that can be used for each aspherical lens in Example 3.

[0155] Table 7. Relevant parameters of the aperture, lenses, and filters in Example 3.

[0156]

[0157] Table 8-1 Coefficients of the first to fourth lenses in Example 3

[0158]

[0159] Table 8-2 Coefficients of the fifth to seventh lenses in Example 3

[0160]

[0161] Table 9. Numerical Table of Parameters and Condition Formulas for Camera Lens in Example 3

[0162]

[0163] As can be seen from Table 9, the values ​​of each conditional expression in this embodiment are all within the aforementioned setting range.

[0164] Figure 10 The field curvature characteristic curves of the camera lens are shown, where the dashed line represents the meridional field curve and the solid line represents the sagittal field curve. Figure 11The distortion characteristic curve of the camera lens is shown. As can be seen from the figure, the camera lens provided in this embodiment has good image quality.

[0165] Example 4

[0166] Please refer to Figures 12-14 , Figure 12 This is a schematic diagram of the fourth embodiment of the camera lens provided in this application. Figure 13 for Figure 12 Field curvature characteristic curve of a mid-range camera lens. Figure 14 for Figure 12 Distortion characteristics curve of a camera lens.

[0167] like Figure 12 As shown, this application provides a fourth implementation method, which is the same as the first embodiment described above in terms of the number of lenses and the lens power. Therefore, it will not be described again here.

[0168] The concavity / convexity of each lens near the optical axis is as follows: the object-side surface of the first lens L1 is convex, and the image-side surface is concave; the object-side surface of the second lens L2 is convex, and the image-side surface is concave; the object-side surface of the third lens L3 is convex, and the image-side surface is concave; the object-side surface of the fourth lens L4 is convex, and the image-side surface is concave; the object-side surface of the fifth lens L5 is convex, and both the image-side surfaces are concave; the object-side surface of the sixth lens L6 is convex, and both the image-side surface is convex; the object-side surface of the seventh lens L7 is convex, and the image-side surface is concave. Filter L8 is an infrared cutoff filter.

[0169] Table 10 below shows the relevant parameters of each lens in Example 4. The units for radius of curvature, thickness, and focal length are all mm. As can be seen from Table 10, all lenses in Example 4 are aspherical lenses. Tables 11-1 and 11-2 below give the coefficients k, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 for the object-side / image-side surfaces that can be used for each aspherical lens in Example 4.

[0170] Table 10. Parameters of the aperture, lens groups, and filters in Example 4

[0171]

[0172] Table 11-1 Coefficients of each surface of the first to fourth lenses in Example 4

[0173]

[0174] Table 11-2 Coefficients of each surface of the fifth to seventh lenses in Example 4

[0175]

[0176] Table 12: Numerical Table of Camera Lens Parameters and Condition Formulas in Example 4

[0177]

[0178] As can be seen from Table 12, the values ​​of each conditional expression in this embodiment are all within the aforementioned setting range, and their lengths are also relatively small.

[0179] Figure 13 The field curvature characteristic curves of the camera lens are shown, where the dashed line represents the meridional field curve and the solid line represents the sagittal field curve. Figure 14 The distortion characteristic curve of the camera lens is shown. As can be seen from the figure, the camera lens provided in this embodiment has good image quality.

[0180] Example 5

[0181] Please refer to Figures 15-17 , Figure 15 This is a schematic diagram illustrating the structure of a fifth embodiment of the camera lens provided in this application. Figure 16 for Figure 15 Field curvature characteristic curve of a mid-range camera lens. Figure 17 for Figure 15 Distortion characteristics curve of a camera lens.

[0182] like Figure 15 As shown, this application provides a fifth implementation method, which is the same as the first embodiment in terms of the number of lenses and optical power, and will not be described again here. The difference is that in this embodiment, the optical power of the fourth lens L4 is positive optical power.

[0183] The concavity / convexity of each lens near the optical axis is as follows: the object-side surface of the first lens L1 is convex and the image-side surface is concave; the object-side surface of the second lens L2 is convex and the image-side surface is concave; the object-side surface of the third lens L3 is convex and the image-side surface is concave; the object-side surface of the fourth lens L4 is concave and the image-side surface is convex; the object-side surface of the fifth lens L5 is convex and both the image-side surfaces are concave; the object-side surface and the image-side surface of the sixth lens L6 are both convex; and the object-side surface of the seventh lens L7 is convex and the image-side surface is concave.

[0184] Table 13 below shows the relevant parameters of each lens in Example 5. The units for radius of curvature, thickness, and focal length are all mm. As can be seen from Table 13, all lenses in Example 5 are aspherical lenses, and filter L8 is an infrared cutoff filter. Tables 14-1 and 14-2 below give the coefficients k, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 for the object-side / image-side surfaces that can be used for each aspherical lens in Example 5.

[0185] Table 13 Relevant parameters of the aperture, lenses, and filters in Example 5

[0186]

[0187] Table 14-1 Coefficients of the first to fourth lenses in Example 5

[0188]

[0189] Table 14-2 Coefficients of each surface of the fifth to seventh lenses in Example 5

[0190]

[0191] Table 15. Numerical table of parameters and condition formulas for the camera lens in Example 5.

[0192]

[0193] Table 15 above shows the numerical values ​​of the conditional formulas for the camera lens involved in Embodiment 1. As can be seen from Table 15, the values ​​of each conditional formula in this embodiment are all within the aforementioned setting range.

[0194] Figure 17 The field curvature characteristic curves of the camera lens are shown, where the dashed line represents the meridional field curve and the solid line represents the sagittal field curve. Figure 18 The distortion characteristic curve of the camera lens is shown, indicating the distortion magnitude corresponding to different image heights. As can be seen from the figure, the camera lens provided in this embodiment has good image quality.

[0195] Example 6

[0196] Please refer to Figures 18-20 , Figure 18 This is a schematic diagram illustrating the sixth embodiment of the camera lens provided in this application. Figure 19 for Figure 18 Field curvature characteristic curve of a mid-range camera lens. Figure 20 for Figure 18 Distortion characteristics curve of a camera lens.

[0197] like Figure 18 As shown, this application provides a sixth implementation method, which is the same as the first embodiment in terms of the number of lenses and optical power, and will not be described again here.

[0198] The concave-convex state of each lens near the optical axis is as follows: the object side of the fourth lens L4 is convex and the image side is concave. The other lenses are arranged in the same way as in the embodiment.

[0199] Table 16 below shows the relevant parameters of each lens in Example 6. The units for radius of curvature, thickness, and focal length are all mm. As can be seen from Table 16, all lenses in Example 6 are aspherical lenses, and filter L8 is an infrared cutoff filter. Tables 17-1 and 17-2 below give the coefficients k, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 for the object-side / image-side surfaces that can be used for each aspherical lens in Example 6.

[0200] Table 16. Parameters of the aperture, lens groups, and filters in Example 6

[0201]

[0202] Table 17-1 Coefficients of each surface of the first to fourth lenses in Example 6

[0203]

[0204] Table 17-2 Coefficients of each surface of the fifth to seventh lenses in Example 6

[0205]

[0206] Table 18. Numerical Table of Camera Lens Parameters and Condition Formulas in Example 6

[0207]

[0208] Table 18 above shows the numerical values ​​of the conditional formulas for the camera lens involved in Embodiment Six. As can be seen from Table 18, the values ​​of each conditional formula in this embodiment are all within the aforementioned set range.

[0209] Figure 19 The field curvature characteristic curves of the camera lens are shown, where the dashed line represents the meridional field curve and the solid line represents the sagittal field curve. Figure 20 The distortion characteristic curve of the camera lens is shown, indicating the distortion magnitude corresponding to different image heights. As can be seen from the figure, the camera lens provided in this embodiment has good image quality.

[0210] Example 7

[0211] Please refer to Figures 21-23 , Figure 21 This is a schematic diagram illustrating the structure of a seventh embodiment of the camera lens provided in this application. Figure 22 for Figure 21 Field curvature characteristic curve of a mid-range camera lens. Figure 23 for Figure 21 Distortion characteristics curve of a camera lens.

[0212] like Figure 21 As shown, the seventh embodiment provided in this application is the same as the first embodiment in terms of the number of lenses and optical power, and will not be described again here.

[0213] The concave-convex condition of each lens near the optical axis is the same as in Example 6, and will not be described in detail here.

[0214] Table 19 below shows the relevant parameters of each lens in Example 6. The units for radius of curvature, thickness, and focal length are all mm. As can be seen from Table 19, all lenses in Example 6 are aspherical lenses, and filter L8 is an infrared cutoff filter. Tables 20-1 and 20-2 below give the coefficients k, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 for the object-side / image-side surfaces that can be used for each aspherical lens in Example 1.

[0215] Table 19 Relevant parameters of the aperture, lens groups, and filters in Example 7

[0216]

[0217] Table 20-1 Coefficients of each surface of the first to fourth lenses in Example 7

[0218]

[0219] Table 20-2 Coefficients of each surface of the fifth to seventh lenses in Example 7

[0220]

[0221] Table 21 Numerical table of parameters and condition formulas for the camera lens in Example 7

[0222]

[0223] Table 21 above shows the numerical values ​​of the conditional formulas for the camera lens involved in Embodiment 7. As can be seen from Table 21, the values ​​of each conditional formula in this embodiment are all within the aforementioned set range.

[0224] Figure 22 The field curvature characteristic curves of the camera lens are shown, where the dashed line represents the meridional field curve and the solid line represents the sagittal field curve. Figure 23 The distortion characteristic curve of the camera lens is shown, representing the distortion magnitude corresponding to different image heights. As can be seen from the figure, the camera lens provided in this embodiment has good image quality.

[0225] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A camera lens, characterized in that, From the object side to the image side, the camera lens sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; wherein, The first lens has positive optical power, the object side of the first lens is convex near the optical axis, and the image side of the first lens is concave near the optical axis. The second lens has negative optical power, the object side of the second lens is convex near the optical axis, and the image side of the second lens is concave near the optical axis; The third lens has positive optical power, and the object side of the third lens is convex near the optical axis; The fifth lens has negative optical power, and the image side of the fifth lens is concave near the optical axis; The sixth lens has positive optical power, and the object side of the sixth lens is convex near the optical axis, and the image side of the sixth lens is convex near the optical axis. The seventh lens has negative optical power, the object side of the seventh lens is convex near the optical axis, and the image side of the seventh lens is concave near the optical axis. The total effective focal length f of the camera lens, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, and the aperture value FNO of the camera lens satisfy the following formula: 2 <f1 / (f6+f7)<5.7; 0.1 < |f / f3| + |f / f4| < 0.5; 1.6 <FNO<1.76; The maximum distance Sag61 from the intersection of the object side of the sixth lens and the optical axis to any point on the object side of the sixth lens in the optical axis direction, the maximum distance Sag72 from the intersection of the image side of the seventh lens and the optical axis to any point on the image side of the seventh lens in the optical axis direction, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy the following formula: 2.4<|Sag61 / CT6|+|Sag72 / CT7|<3.3; The optical components with optical power in the camera lens are only the seven lenses mentioned above.

2. The camera lens according to claim 1, characterized in that, The diagonal length of half the effective pixel area on the imaging surface of the camera lens, ImgH, satisfies the following formula with the aperture value FNO of the camera lens: ImgH / FNO>2.

9.

3. The camera lens according to claim 1 or 2, characterized in that, The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy the following formula: -6 <f1 / f6-f2 / f7<-1。 4. The camera lens according to claim 1 or 2, characterized in that, The distance TTL from the object side surface of the first lens to the imaging surface in the optical axis direction, the radius of curvature R11 of the object side surface of the first lens near the optical axis, and the radius of curvature R72 of the image side surface of the seventh lens near the optical axis satisfy the following formula: 7 < TTL / (R72 / R11) < 12.

5. The camera lens according to claim 1 or 2, characterized in that, The entrance pupil diameter (EPD) of the camera lens and the maximum half field of view (HFOV) of the camera lens satisfy the following formula: EPD*tan(HFOV)>2.

8.

6. The camera lens according to claim 1 or 2, characterized in that, The distance TTL from the object side of the first lens of the camera lens to the imaging surface in the optical axis direction, and half the diagonal length ImgH of the effective pixel area on the imaging surface of the camera lens satisfy the following formula: TTL / ImgH<1.

3.

7. The camera lens according to claim 1 or 2, characterized in that, The effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens, the radius of curvature R11 of the object side of the first lens near the optical axis, and the radius of curvature R72 of the image side of the seventh lens near the optical axis satisfy the following formula: 4 < f1 / R11-f7 / R72<5.

5.

8. The camera lens according to claim 1 or 2, characterized in that, The Abbe number Vd1 of the first lens satisfies the following formula: 50 < Vd1 < 85.

9. The camera lens according to claim 1 or 2, characterized in that, The radius of curvature R11 of the object side of the first lens near the optical axis and the radius of curvature R12 of the image side of the first lens near the optical axis satisfy the following formula: 4 < (R11 + R12) / R11 < 6.

5.

10. The camera lens according to claim 1 or 2, characterized in that, The distance DT23 between the image side of the second lens and the object side of the third lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis satisfy the following formula: 1 < (CT2 + CT3) / DT23 < 3.

1.

11. The camera lens according to claim 1 or 2, characterized in that, The center thickness CT4 of the fourth lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy the following formula: 0.5 < (CT4 + CT5) / (CT6 + CT7) < 0.

9.

12. The camera lens according to claim 1 or 2, characterized in that, It also includes an aperture stop, which is disposed on one side of the object side of the first lens, or the aperture stop is disposed between the second lens and the third lens; Or / and, it also includes a filter disposed on the side of the seventh lens opposite to the sixth lens; Alternatively / and, at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspherical lens.

13. A terminal device, characterized in that, It includes a body and a camera module, wherein the camera module includes the camera lens as described in any one of claims 1-12.

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