Optical lens, camera module and terminal

Abstract

The invention provides an optical lens, a camera module and a terminal, the optical lens comprises a plurality of lenses with focal power, and the plurality of lenses with focal power at least comprise a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along a direction from an object side to an image side. Wherein the first lens is the lens closest to the object side in a plurality of lenses with focal power, the first lens has negative focal power, the second lens has positive focal power, and the third lens has positive focal power; the fourth lens has negative focal power. According to the optical lens, the first lens and the fourth lens can realize expanded imaging of light, the light can have a large imaging size on an imaging surface, the magnification of the optical lens is high, high-quality microscopic shooting can be realized, high-magnification and high-definition shooting of a tiny shot object can be realized, and the imaging quality of the optical lens is improved. And the microscopic shooting requirement is met.

Description

Technical Field

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

[0002] With the growth of user demands and market diversification, mobile devices are constantly exploring and expanding application scenarios in photography, gradually covering users' daily photography needs, such as portrait photography, telephoto photography, time-lapse photography, and motion capture photography. Microscopic photography, as an emerging photographic scenario, offers users the possibility of exploring the microscopic world and has also gained market demand. Currently, mobile devices typically use telephoto lens modules to cover microscopic photography needs. However, telephoto lenses are limited by their focal length range and cannot achieve close-up shooting. Furthermore, in microscopic photography mode, they suffer from low maximum magnification and low resolution, making it difficult to meet users' demands for higher-quality microscopic photography. Summary of the Invention

[0003] This application provides an optical lens, a camera module, and a terminal to obtain an optical lens with good macro imaging quality, high magnification, and high resolution, thereby enabling microscopic imaging with good image quality.

[0004] In a first aspect, this application provides an optical lens comprising a plurality of lenses having optical power. The plurality of lenses having optical power includes at least a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the direction from the object side to the image side. The first lens is the lens closest to the object side among the plurality of lenses having optical power. The first lens has negative optical power, the second lens has positive optical power, the third lens has positive optical power, and the fourth lens has negative optical power.

[0005] It should be noted that optical power is used to describe the ability of a lens to diverge or converge light. The lens with optical power described in this application can also be understood as a lens with a non-zero optical power, capable of converging or diverging light. Conversely, a lens without optical power can be understood as a lens with zero optical power, which will not converge or diverge light. In the embodiments of this application, the multiple lenses with optical power in the optical lens may include not only the four lenses mentioned above, but also other lenses not mentioned. For example, the optical lens includes 6-8 lenses, and this application does not limit the specific number of lenses in the optical lens. In embodiments where the optical lens includes other lenses, all other lenses not mentioned are located on the image side of the fourth lens.

[0006] The magnification of an optical lens refers to the ratio of the image size of the subject on the imaging plane to the actual size of the subject. In the optical lens provided in the first aspect, the first lens element has negative optical power and a diverging effect on light. When light from the subject enters the optical lens, it first passes through the first lens element to achieve divergence, resulting in an enlarged image. The second lens element has a converging effect on light, adjusting the light range and correcting phase aberrations. The third lens element has positive optical power and can further correct phase aberrations and distortions, improving image quality. The fourth lens element has negative optical power and can further diverge light, resulting in an enlarged image of light emitted from the fourth lens element. Therefore, the aforementioned optical lens can diverge light through at least the first and fourth lens elements when photographing an object, facilitating an enlarged image of the subject's light on the imaging plane. This optical lens is suitable for photographing small subjects. It has a high magnification, allowing the subject's light to be imaged on the image sensor at a larger image size, resulting in higher clarity and image quality. Therefore, the aforementioned optical lens can achieve high magnification and high definition in photographing tiny objects, which is beneficial for achieving microscopic photography with good image quality.

[0007] In an optical lens, the lens closest to the imaging plane among multiple lenses with optical power is the last lens. Light passes through the last lens and is projected onto the imaging plane to form an image. In some possible implementations, the last lens has negative optical power. For example, in an embodiment where the optical lens includes four lenses, the fourth lens is the last lens. In an embodiment where the optical lens includes six lenses, the last lens is the sixth lens. In an embodiment where the optical lens includes eight lenses, the last lens is the eighth lens. Because the last lens has negative optical power, light can be further diverged when passing through it, further expanding the range of light projected onto the imaging plane. This allows the optical lens to achieve high magnification and high-resolution microscopic imaging.

[0008] The optical effective aperture of a lens refers to the maximum diameter of the effective area on the lens that allows light to pass through in the direction perpendicular to the optical axis. In some possible implementations, the optical effective aperture D1 of the first lens and the optical effective aperture D of the last lens... L Satisfying 1≤D L The relationship / D1≤5 applies. An optical lens that satisfies this relationship ensures that, in microscope mode, the image height of light passing through the last lens element is greater than the image height of light passing through the first lens element. This allows the image height of the subject on the imaging plane to be equal to or greater than the actual height of the subject, enabling the optical lens to achieve microscope imaging with a magnification of 1x or greater.

[0009] In some embodiments of the first aspect, the magnification of the optical lens is in the range of 1x-5x. An optical lens that meets the above magnification can capture finer structures on the subject and the captured image has higher clarity, which is beneficial for subsequent magnification and observation of the image.

[0010] In some possible embodiments of the first aspect, the optical lens further includes an aperture stop. Exemplarily, the aperture stop is an aperture stop capable of controlling the incident range of light. The aperture stop is disposed on the object side of the first lens element, or, the aperture stop is disposed between the lens elements of the optical lens.

[0011] In some embodiments of the first aspect, the aperture stop is located between the second and third lenses. In this embodiment, light rays are diffused by the first lens and then converged by the second lens. The converged light rays are more likely to pass through the aperture stop, which increases the amount of light transmitted through the aperture stop and improves the image quality.

[0012] Because different wavelengths of light have different refractive effects, axial chromatic aberration easily occurs, meaning that light of different wavelengths forms images at different positions along the optical axis. The second lens, having positive optical power, can converge light to correct the axial chromatic aberration caused by the divergence of the light after passing through the first lens. In some possible embodiments, the object-side surface of the second lens is convex. This convex surface allows the second lens to adapt to the different wavelengths of light emitted from the first lens, enabling light to enter the second lens at different axial positions, thus enhancing its ability to correct axial chromatic aberration and improving image quality.

[0013] In some possible embodiments of the first aspect, the object-side surface of the fourth lens is formed as a concave surface, which is beneficial to improving the diffusion effect of the fourth lens on light and increasing the imaging range. Furthermore, the concave surface of the object-side surface of the fourth lens allows light to enter the fourth lens at different positions along the axial direction, reducing axial chromatic aberration and facilitating the acquisition of images with good imaging quality.

[0014] In some possible embodiments of the first aspect, the optical lens further includes a cover lens located on the object side of the first lens. It should be noted that the first lens is the lens closest to the object side among a plurality of lenses having optical power, while the cover lens does not have optical power. The cover lens serves to protect the first lens, preventing damage to the first lens or other internal structures of the optical lens from the photographed object or other structures when the optical lens is used to photograph an object at close range.

[0015] For example, the cover lens has a thickness of less than or equal to 1 mm along the optical axis to reduce its impact on imaging. For example, the cover lens has a thickness of 0.5 mm or 0.4 mm along the optical axis.

[0016] In some possible embodiments of the first aspect, the optical lens includes at least one variable-focal-length liquid lens. A liquid lens uses a liquid as a lens, changing the focal length by altering the curvature of the liquid. Optical lenses with liquid lenses have variable focal lengths, enabling them to adapt to a wider working distance and increasing their usability. Furthermore, liquid lenses allow the optical lens to zoom without the need for mechanical drive components, facilitating miniaturization of the optical lens.

[0017] For example, the liquid lens mentioned above is a graded refractive index lens, a liquid-filled lens, or a wetting effect lens.

[0018] In some possible implementations of the first aspect, the working distance W of the optical lens and the system focal length f of the optical lens satisfy the relationship 0 ≤ |W / f| ≤ 4.0. The working distance W refers to the distance between the object surface and the front surface of the optical lens in scenarios where the optical lens can achieve clear imaging. The front surface of the optical lens refers to the surface of the optical lens closest to the object side. In embodiments where the optical lens includes a cover lens, the front surface of the optical lens is the outer surface of the cover lens. In embodiments where no other lens is disposed on the object side of the first lens element, the front surface of the optical lens is the object side surface of the first lens element. Optical lenses satisfying the above relationship are suitable for macro microscopic imaging, capable of clearly capturing details on the subject and achieving high magnification and high-definition macro imaging performance.

[0019] In some possible implementations of the first aspect, the working distance W of the optical lens is less than or equal to 3 mm, and an optical lens that meets this working distance can achieve ultra-close-range macro microscopy.

[0020] In some possible implementations of the first aspect, the system focal length f of the optical lens is 0.4mm-1mm. Optical lenses that meet this system focal length are suitable for macro photography needs. In ultra-close macro photography scenarios, the optical lens can still achieve focusing and achieve clear shooting.

[0021] In some possible implementations of the first aspect, the working distance W of the optical lens and the total optical length TTL of the optical lens satisfy the relationship 0 ≤ |W / TTL| ≤ 1.0. An optical lens satisfying this relationship not only enables macro photography, but also keeps the total optical length within a small range, facilitating the arrangement of the optical lens, especially in portable terminals. The small space occupied by the optical lens promotes the widespread adoption of microscopic imaging in terminals.

[0022] Secondly, this application provides a camera module, including a photosensitive element and an optical lens as described in any of the aforementioned possible embodiments, wherein the photosensitive element is located on the image side of the optical lens. The photosensitive element can be used to convert the light signal transmitted by the optical lens into an image signal. This optical lens can achieve high magnification and high definition imaging of tiny subjects, which is beneficial for achieving microscopic imaging with good image quality. This allows the camera module to be applied to microscopic imaging scenarios and has good microscopic imaging effects.

[0023] In some possible implementations of the second aspect, the working distance W of the optical lens and the diagonal length Diag of the photosensitive element satisfy the relationship 0 ≤ |W / Diag| ≤ 5. In a camera module that satisfies this relationship, the target surface size of the photosensitive element can ensure the imaging integrity of the optical lens, enabling the achievement of good imaging quality, high magnification, and high-quality microscopic imaging effects in microscopic photography.

[0024] Thirdly, this application provides a terminal including an image processor and a camera module as described in any of the aforementioned possible embodiments. The image processor is communicatively connected to the camera module. The camera module is used to acquire image data and input the image data into the image processor. The image processor is used to process the output image data. This terminal can meet the needs of macro microscopy, providing microscopic imaging functions with good imaging quality, high magnification, and high quality. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a terminal provided in an exemplary embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the structure of a terminal provided in another exemplary embodiment of this application;

[0028] Figure 3 This is a schematic diagram of the structure of a terminal provided in another exemplary embodiment of this application, wherein the signal transmission relationship within the terminal is illustrated by arrows.

[0029] Figure 4 This is a schematic diagram of the structure of the optical lens provided in the first embodiment of this application;

[0030] Figure 5This is a schematic diagram of the structure of an optical lens provided in the first embodiment of this application, wherein the propagation path of light in the optical lens is illustrated by lines.

[0031] Figure 6 This is a defocus curve diagram of the optical lens provided in the first embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the structure of the optical lens provided in the second embodiment of this application;

[0033] Figure 8 This is a schematic diagram of the structure of an optical lens provided in the second embodiment of this application, wherein the propagation path of light in the optical lens is illustrated by lines.

[0034] Figure 9 This is a defocus curve diagram of the optical lens provided in the second embodiment of this application;

[0035] Figure 10 This is a schematic diagram of the structure of the optical lens provided in the third embodiment of this application;

[0036] Figure 11 This is a schematic diagram of the structure of an optical lens provided in the third embodiment of this application, wherein the propagation path of light in the optical lens is illustrated by lines.

[0037] Figure 12 This is a defocus curve diagram of the optical lens provided in the third embodiment of this application;

[0038] Figure 13 This is a schematic diagram of the structure of the optical lens provided in the fourth embodiment of this application;

[0039] Figure 14 This is a schematic diagram of the structure of an optical lens provided in the fourth embodiment of this application, wherein the propagation path of light in the optical lens is illustrated by lines.

[0040] Figure 15 This is a defocus curve diagram of the optical lens provided in the fourth embodiment of this application;

[0041] Figure 16 This is a schematic diagram of the structure of the optical lens provided in the fifth embodiment of this application;

[0042] Figure 17 This is a schematic diagram of the structure of an optical lens provided in the fifth embodiment of this application, wherein the propagation path of light in the optical lens is illustrated by lines.

[0043] Figure 18 This is a defocus curve diagram of the optical lens provided in the fifth embodiment of this application;

[0044] Figure 19This is a schematic diagram of the structure of the optical lens provided in the sixth embodiment of this application;

[0045] Figure 20 This is a schematic diagram of the structure of an optical lens provided in the sixth embodiment of this application, wherein the propagation path of light in the optical lens is illustrated by lines.

[0046] Figure 21 This is a defocus curve diagram of the optical lens provided in the sixth embodiment of this application. Detailed Implementation

[0047] The embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0048] First, a unified explanation of the terminology that may be involved in the embodiments of the present invention will be provided.

[0049] Optical axis: refers to a ray of light that passes perpendicularly through the optical center of an ideal lens. When rays of light parallel to the optical axis enter a convex lens, an ideal convex lens should converge all rays to a single point behind the lens; this point where all rays converge is called the focal point.

[0050] Imaging plane: refers to the plane on which the image of the subject is formed after being imaged by the optical system. The photosensitive element is set on the imaging plane and can record the image of the subject after it is imaged.

[0051] Object side and image side: With the lens as the boundary, the side where the object is located is called the object side, and the surface of the lens facing the object side can be called the object side; with the lens as the boundary, the other side opposite to the object side is called the image side, and the surface of the lens facing the image side is called the image side.

[0052] Optical power, positive optical power, negative optical power: Optical power refers to the ability of a lens or a local area of ​​a lens to diverge or converge light; positive optical power, also known as positive refractive power, refers to the ability of a lens or a local area of ​​a lens to have a positive focal length and converge light; negative optical power, also known as negative refractive power, refers to the ability of a lens or a local area of ​​a lens to have a negative focal length and diverge light.

[0053] Optical effective aperture: The maximum diameter of the optically effective area on a lens that allows light to pass through in the direction perpendicular to the optical axis.

[0054] Focal length, also known as focal length, is a measure of the converging or diverging effect of light. It refers to the distance between the optical center of a lens or lens and the image plane when a distant object is projected into a sharp image. The focal length of a lens is the distance from its optical center to the image plane. For prime lenses, the position of the optical center remains constant; for zoom lenses, changes in the optical center result in changes in the focal length.

[0055] Total track length (TTL): The maximum distance on the optical axis between the lens closest to the subject and the imaging surface in an optical system.

[0056] Aperture: A device used to control the amount of light passing through the lens and entering the camera body; it is usually located inside the lens. The size of the aperture is usually expressed as an aperture value (F / number). The aperture value is equal to the ratio of the focal length of the optical system to the diameter of the entrance pupil. Aperture values ​​can be expressed as F / 1.2, F / 1.8, F / 2.5, F / 3.0, F / 4.8, or F / 5.0. The smaller the aperture value, the more light enters the camera in the same unit of time. A variable aperture refers to an aperture whose aperture value can be adjusted.

[0057] Magnification: This refers to the ratio of the image size of the subject on the imaging plane through an optical lens to the actual size of the subject. For example, the magnification can be 3x, 1.5x, or 0.5x. A magnification of 3x means that the image size of the subject on the imaging plane is three times the actual size of the subject.

[0058] Entrance pupil diameter (EPD): This refers to the diameter of the largest beam of light that enters the lens perpendicularly from the object side in a direction parallel to the optical axis. The entrance pupil diameter is equal to the ratio of the focal length to the aperture value of the optical system. It should be noted that in optical systems using a variable aperture, the entrance pupil diameter varies with the aperture value. When the aperture value is the smallest aperture value within the variable range, the entrance pupil diameter corresponding to that smallest aperture value is the lens's maximum entrance pupil diameter; conversely, when the aperture value is the largest aperture value within the variable range, the entrance pupil diameter corresponding to that largest aperture value is the lens's minimum entrance pupil diameter.

[0059] Stops: These include aperture stops and field stops. Aperture stops are used to control the width of the imaging beam, determine the entrance pupil diameter and solid angle of the beam, and affect the amount of light entering the optical system. Field stops are used to control the field of view of the object space that can be imaged by the optical system.

[0060] Axial chromatic aberration: also known as longitudinal chromatic aberration, positional chromatic aberration, or axial aberration. A beam of light parallel to the optical axis converges at different positions after passing through a lens; this aberration is called positional chromatic aberration or axial chromatic aberration. This is because the lens images light of different wavelengths at different positions, causing the focal planes of the images of different colors of light to not coincide, resulting in the dispersion of polychromatic light.

[0061] Distortion, also known as image distortion, refers to the degree of distortion in the image formed by an optical system relative to the object itself. Distortion occurs due to the spherical aberration of the aperture. The height of the intersection point between the principal ray from different fields of view and the Gaussian image plane is not equal to the ideal image height; this difference is the distortion. Therefore, distortion only changes the imaging position of an off-axis object point on the ideal plane, causing a distortion in the image shape, but it does not affect the image's sharpness.

[0062] The following section will describe in detail the specific structures of the terminal 1000, the camera module 100, and the optical lens 10, with reference to the accompanying drawings.

[0063] like Figure 1 As shown, the first aspect of this application provides a terminal 1000, which can be a mobile phone, tablet computer, laptop computer, camera, video recorder, camera, smart TV, network monitoring equipment, motion-sensing game console, dashcam, reversing camera, wearable electronic device, small drone, three-dimensional image capturing device or other forms of device with photo or video recording function. Figure 1 This is a schematic diagram of the structure of a terminal 1000 according to an embodiment of this application. In this embodiment, the terminal 1000 is a mobile phone, and the back panel of the terminal 1000 is shown. This application embodiment is described using a mobile phone as an example of the terminal 1000.

[0064] Terminal 1000 may include a camera module 100 and an image processor 300. The image processor 300 is communicatively connected to the camera module 100. The camera module 100 acquires image data and inputs the image data into the image processor 300. The image processor 300 processes the output image data. In practical applications, terminal 1000 also includes a housing, in which both the camera module 100 and the image processor 300 are housed. The housing has a light-transmitting hole, with the light-incident side of the camera module 100 facing the light-transmitting hole of the housing. In some embodiments, the communication connection between the camera module 100 and the image processor 300 may include data transmission via electrical connections such as wiring, or data transmission via coupling or other methods. The camera module 100 and the image processor 300 may also be connected via any other means capable of data transmission, and this application does not impose specific limitations on this.

[0065] The image processor 300 optimizes digital image signals through a series of mathematical algorithms and then transmits the processed signals to a display or memory. The image processor 300 can be an image processing chip or a digital signal processing (DSP) chip. Its function is to transmit the data obtained by the photosensitive element 20 of the camera module 100 to the central processing unit (CPU) in a timely and rapid manner and refresh the photosensitive element 20. Therefore, the quality of the DSP chip directly affects the image quality (such as color saturation and sharpness). The image processor 300 can also be integrated into other chips (such as a CPU chip).

[0066] exist Figure 1 In the illustrated embodiment, the camera module 100 is located on the back of the terminal 1000, serving as the rear camera of the terminal 1000. In some embodiments, the camera module 100 may also be selectively located on the front of the terminal 1000, serving as the front camera of the terminal 1000. Both the front and rear cameras can be used for selfies or for the photographer to capture images of other objects.

[0067] In some embodiments, the terminal 1000 may have multiple camera modules 100, where "multiple" refers to two or more. Different camera modules 100 may have the same or different structures and performance to meet different shooting requirements. For example, in some embodiments, the multiple camera modules 100 may include zoom camera modules or fixed-focus camera modules to achieve zoom shooting and fixed-focus shooting respectively. All multiple camera modules 100 may be communicatively connected to the image processor 300, and the multiple camera modules 100 may selectively cooperate to achieve better shooting results.

[0068] It should be understood that Figure 1 The installation position of the camera module 100 in the terminal 1000 of the illustrated embodiment is merely illustrative. In some other embodiments, the camera module 100 may also be installed in other locations on the mobile phone, such as the upper part, upper left corner, or upper right corner of the back of the mobile phone. Alternatively, the camera module 100 may not be mounted on the main body of the mobile phone, but on a component that is movable or rotatable relative to the mobile phone. For example, this component may extend outward from, retract from, or rotate from the main body of the mobile phone. This application does not impose any limitation on the installation position of the camera module 100.

[0069] like Figure 2As shown, in some embodiments, the terminal 1000 may further include an analog-to-digital converter 200 (also known as an A / D converter). The analog-to-digital converter 200 is connected between the camera module 100 and the image processor 300. The analog-to-digital converter 200 is used to convert the signal generated by the camera module 100 into a digital image signal and transmit it to the image processor 300. The image processor 300 then processes the digital image signal and finally displays the image or video on a display screen or monitor.

[0070] In some embodiments, the terminal 1000 may further include a memory 400, which is communicatively connected to the image processor 300. The image processor 300 processes the digital image signal and then transmits the image to the memory 400, so that the image can be retrieved from the storage and displayed on the screen at any time when it is needed to view the image later. In some embodiments, the image processor 300 may also compress the processed digital image signal before storing it in the memory 400 to save memory space. It should be noted that... Figure 2 This is only a schematic diagram of the structure of the terminal 1000 provided in one exemplary embodiment of this application. The positions and structures of the camera module 100, image processor 300, analog-to-digital converter 200, memory 400, etc. shown are only illustrative, and this application does not limit their positions and specific structures.

[0071] This invention provides a camera module 100, which includes a photosensitive element 20 and an optical lens 10, wherein the photosensitive element 20 is located on the image side of the optical lens 10. Figure 3 As shown, Figure 3 A schematic diagram of the structure of a camera module 100 provided in an exemplary embodiment of this application is shown.

[0072] Please refer to Figure 3 As shown, based on the above embodiment, the working principle of the camera module 100 is as follows: Light reflected from the subject passes through the optical lens 10 to generate an optical image, which is projected onto the surface of the photosensitive element 20. The photosensitive element 20 converts the optical image into an electrical signal to obtain an analog image signal Sig1, and transmits the converted analog image signal Sig1 to the analog-to-digital converter 200, which converts it into a digital image signal Sig2 for the image processor 300. The image processor 300 can display the digital image signal Sig2 as an image or video through a display screen or monitor. Alternatively, the image processor 300 can process the digital image signal Sig2 before transmitting it to the memory 400, so that the image can be retrieved from the memory and displayed on the display screen at any time when it is needed to view the image later.

[0073] Specifically, the camera module 100 may also include a circuit board (not shown). The photosensitive element 20 is fixed to the circuit board by bonding or surface mounting. The analog-to-digital converter 200, image processor 300, memory 400, etc., can also be connected to the circuit board by bonding or surface mounting, thereby realizing the communication connection between the photosensitive element 20, analog-to-digital converter 200, image processor 300, memory 400, etc. through the circuit board. The circuit board can be a flexible printed circuit board (FPC) or a printed circuit board (PCB) for transmitting electrical signals. The FPC can be a single-sided flexible board, a double-sided flexible board, a multi-layer flexible board, a rigid-flexible board, or a hybrid flexible circuit board.

[0074] The photosensitive element 20 is a semiconductor chip containing hundreds of thousands to millions of photodiodes on its surface. When illuminated by light, these photodiodes generate electrical charges, which are then converted into digital signals by an analog-to-digital converter (ADC). The photosensitive element 20 can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device. A CCD is made using a highly sensitive semiconductor material that converts light into electrical charges, which are then converted into digital signals by the ADC. A CCD consists of many photosensitive units, typically measured in megapixels. When light illuminates the CCD surface, each photosensitive unit reflects a charge onto its component. The signals generated by all the photosensitive units are combined to form a complete image. CMOS primarily utilizes semiconductors made of silicon and germanium, allowing N-type (negatively charged) and P-type (positively charged) semiconductors to coexist on the CMOS. The current generated by these complementary effects can be recorded and interpreted into an image by the ADC.

[0075] It should be noted that the size of the photosensitive element 20 is positively correlated with the imaging area; the larger the size of the photosensitive element 20, the better it is for improving the imaging quality of the camera module. In some embodiments, the terminal 1000 can use a photosensitive element 20 with a large target surface. Taking a mobile phone as an example, mobile phones in related technologies typically use photosensitive elements 20 with a target surface of 2 / 3 inch or 1 / 1.8 inch. However, in this embodiment, the mobile phone can use a photosensitive element 20 with a target surface greater than or equal to 1 inch. Alternatively, it can be understood that the mobile phone can use a photosensitive element 20 similar to that of a DSLR camera. Since the photosensitive element 20 in this embodiment has a large target surface and a larger effective light-sensitive area, it is beneficial for improving the imaging clarity and image quality of the camera module 100.

[0076] Of course, in other embodiments, the photosensitive element 20 can also be a smaller target surface, and the camera module 100 can select photosensitive elements 20 with different target surface sizes as needed. In embodiments where the terminal 1000 has multiple camera modules 100, different camera modules 100 can select photosensitive elements 20 with different target surface sizes to suit different imaging needs. In other embodiments, multiple camera modules 100 can also share a single photosensitive element 20, or at least two of the multiple camera modules 100 can share a single photosensitive element 20.

[0077] In some embodiments, the camera module 100 may further include a drive member (not shown) and a housing. The housing includes a through-hole and a receiving space, the through-hole communicating with the receiving space and being disposed opposite to the light-transmitting hole of the housing. The drive member, the photosensitive element 20, and the optical lens 10 are all housed within the receiving space. The photosensitive element 20 is located on the image side of the optical lens 10 and on the imaging plane of the optical lens 10. The drive member is used to drive the components in the optical lens 10 to achieve focusing. The light-incident side of the optical lens 10 is disposed towards the through-hole. In other embodiments, the camera module 100 may not have a housing, and the photosensitive element 20 may be fixed to a bracket or other structure.

[0078] In some embodiments, the driving member can be used to drive related elements of the optical lens 10 to achieve focusing or image stabilization of the optical lens 10 (or camera module 100). The driving member may include one or more driving units, which are used to drive the related elements of the optical lens 10 for focusing and / or optical image stabilization. When the driving member drives the related elements of the optical lens 10 for focusing, the driving units drive relative movement between the related elements of the optical lens 10 to achieve focusing. When the driving member drives the related elements of the optical lens 10 for image stabilization, the driving units drive the related elements of the optical lens 10 to move or rotate relative to the photosensitive element 20, and / or drive relative movement or rotation of the related elements of the optical lens 10 to achieve optical image stabilization. Specifically, the driving unit may be a motor, electric motor, or other driving structure.

[0079] In some embodiments, the optical lens may further include an infrared filter, located at the image-side end of the optical lens 10 and positioned between the lens elements and the photosensitive element 20. Light processed by the lens elements of the optical lens 10 illuminates the infrared filter and, after being filtered, is transmitted to the photosensitive element 20. The infrared filter eliminates unwanted light projected onto the photosensitive element 20, preventing false colors or ripples, thereby improving its effective resolution and color reproduction. In some embodiments, the infrared filter may also be fixed to the circuit board where the photosensitive element 20 is located. Other components included in the camera module 100 will not be described in detail here.

[0080] In other embodiments, an imaging correction element may be provided on the side of the optical lens 10 near the imaging surface to achieve the effect of correcting the image (such as bending).

[0081] Camera modules can be used in various scenarios, including telephoto photography, portrait photography, macro photography, and motion capture photography. Different applications have different requirements for the structure and parameters of the camera module. Taking macro photography as an example, related technologies mainly include two types: microscopic imaging and telephoto macro technology. Microscopic imaging technology refers to the method of photographing objects using a microscope lens. The microscope lens can image objects with minute details at very close shooting distances, with high clarity and resolution. Telephoto macro photography technology refers to using a telephoto lens to bring distant objects into the frame, achieving magnified imaging of the subject. A telephoto lens typically refers to a camera lens with a system focal length greater than 50mm, and its object distance can range from several meters to tens of meters.

[0082] Due to their wide focal length range, telephoto lenses are suitable for various shooting scenarios and are therefore widely used in end-products. Telephoto lenses can partially cover the macro photography needs of end-products with their telephoto macro photography modes. However, as users' requirements for macro photography increase, telephoto macro photography is gradually failing to meet the demand for higher quality macro photography. First, limited by the system focal length range of telephoto lenses, they cannot photograph objects at close range. In scenarios where the object distance between the subject and the lens is too small—for example, if the object distance is less than the telephoto lens's minimum focusing distance—the telephoto lens cannot photograph the subject, or it cannot achieve a clear image due to focusing issues, resulting in poor macro photography performance.

[0083] On the other hand, telephoto lenses bring distant objects into the frame and magnify them, resulting in the image size of the object on the sensor being significantly smaller than its actual size. This limits the magnification of telephoto lenses; telephoto macro photography cannot achieve 1x magnification for the same size subject, let alone magnification greater than 1x. Furthermore, the small image size of the object on the sensor also leads to low image resolution and poor image quality.

[0084] It is evident that telephoto lenses cannot meet the demands for higher magnification and more detailed macro photography, and the resolution and image quality of macro photography using telephoto lenses are unlikely to satisfy user needs.

[0085] This application provides an optical lens 10 capable of achieving high magnification and high definition shooting functions. The structure of the optical lens 10 and the setting of related optical parameters will be described in detail below with reference to the accompanying drawings.

[0086] like Figure 4 As shown, the optical lens 10 provided in this embodiment includes a plurality of lenses with optical power. These lenses include at least a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged sequentially from the object side to the image side. The first lens L1 is the lens closest to the object side among the lenses with optical power in the optical lens 10. That is, the order in which light passes through the lenses with optical power in the optical lens 10 is as follows: first, it passes through the first lens L1, then sequentially through the second lens L2, the third lens L3, and the fourth lens L4.

[0087] It should be noted that optical power is used to describe a lens's ability to diverge or converge light. The lens with optical power described in the embodiments of this application can also be understood as a lens with a non-zero optical power, capable of converging or diverging light. Conversely, a lens without optical power can be understood as a lens with zero optical power, which will not converge or diverge light.

[0088] For example, when parallel incident light rays of the same wavelength pass through a lens with positive optical power, their outgoing light rays intersect at a single point on the light-emitting side of the lens. This is the converging effect of a lens with positive optical power. Conversely, when parallel incident light rays of the same wavelength pass through a lens with negative optical power, their outgoing light rays diverge on the light-emitting side of the lens. The backward extensions of these diverged outgoing light rays intersect at a single point on the light-emitting side of the lens. This is the diverging effect of a lens with negative optical power. Finally, when parallel incident light rays of the same wavelength pass through a lens without optical power, their outgoing light rays remain parallel to each other on the light-emitting side of the lens.

[0089] The embodiments of this application do not limit whether the object side of the first lens L1 is provided with a lens without optical power. For example, in some embodiments, the object side of the first lens L1 may be provided with a cover lens L0, which can protect the first lens L1.

[0090] In some embodiments, the optical lens 10 may include only the aforementioned four lenses, or it may include other lenses besides the aforementioned four lenses. For example, in an embodiment where the optical lens 10 has six lenses, refer to... Figure 10 As shown, the optical lens 10 also includes a fifth lens L5 and a sixth lens L6 located on the image side of the fourth lens L4. In an embodiment where the optical lens 10 has seven lenses, refer to... Figure 7 As shown, the optical lens 10 also includes a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged sequentially along the object-side to the image-side, with the fifth lens L5 located on the image side of the fourth lens L4. In an embodiment where the optical lens 10 has eight lenses, refer to... Figure 4 , Figure 13 , Figure 16 as well as Figure 19 As shown, the optical lens 10 also includes a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8 arranged sequentially along the direction from the object side to the image side, with the fifth lens L5 located on the image side of the fourth lens L4.

[0091] It should be noted that the optical lens 10 is composed of multiple different lens elements. Different combinations of lens elements (such as the order in which the lens elements are arranged along the optical path, the lens material, refractive index, shape, curvature, etc.) result in different optical performances. The lens elements closer to the object side in the optical lens 10 have a more significant effect on adjusting the optical path and a higher importance on the optical effect. Conversely, the lens elements closer to the image side in the optical lens 10 bear a greater responsibility for correcting aberrations to adjust image quality.

[0092] In the optical lens 10 provided in this application, the first lens L1 to the fourth lens L4 can adjust the optical path and correct phase aberration, making the optical lens 10 suitable for microscopic imaging scenarios. The optical lens 10 provided in this application will be described below with reference to specific embodiments.

[0093] In the optical lens 10, the first lens L1 has negative optical power, the second lens L2 has positive optical power, the third lens L3 has positive optical power, and the fourth lens L4 has negative optical power.

[0094] The first lens L1 has negative optical power, meaning it has a diverging effect on light. When light from the subject enters the optical lens 10, it first passes through the first lens L1, where it is diverged. The light rays exiting the first lens L1 have a wider range than those entering it; in other words, the diverged light from the first lens L1 produces an enlarged image. The light then passes through the second lens L2, which converges the light, adjusting the range and correcting aberrations. The third lens L3 has positive optical power, further correcting aberrations and distortions to improve image quality. The fourth lens L4 has negative optical power, further diverging the light and resulting in an enlarged image. Therefore, the optical lens 10, when photographing an object, can diverge light through at least the first lens L1 and the fourth lens L4, facilitating image enlargement and allowing for a larger image size on the photosensitive element 20. The light has a large imaging size on the photosensitive element 20, and the optical lens 10 has a high magnification, which helps to improve the clarity of the image and obtain high-quality captured images.

[0095] Compared to conventional lenses where the first lens with optical power is typically positive, the optical lens 10 provided in this application has a first lens L1 with negative optical power, expanding the range of light entering subsequent optical paths. This allows the optical lens 10 to achieve a magnification of 1x for same-size imaging. Furthermore, the light can be further amplified by subsequent lenses, for example, by a fourth lens L4, enabling the optical lens 10 to achieve magnification greater than 1x. In some possible embodiments of this application, the magnification of the optical lens 10 can be in the range of 1x-5x.

[0096] The aforementioned optical lens 10 features high magnification and high definition, facilitating high-quality microscopic imaging. For example, when the optical lens 10 captures images of a small object, the light reflected from the object enters the lens 10 and is first diffused by the first lens L1. This allows the light to have a larger imaging range when entering subsequent lenses. The second lens L2 and the third lens L3 correct phase aberrations and distortions in the image. The corrected light then passes through the fourth lens L4 for further diffusion, expanding the imaging size. The light is imaged on the photosensitive element 20 at an equal or expanded imaging size, resulting in images with high magnification and high definition. These images reveal more minute details of the object, facilitating subsequent magnification and observation, thus meeting the user's microscopic imaging needs.

[0097] Among the multiple lenses with optical power in the optical lens 10, the one closest to the imaging plane is the last lens. In an embodiment where the optical lens 10 includes six lenses, the last lens is the sixth lens L6. In an embodiment where the optical lens 10 includes eight lenses, the last lens is the eighth lens L8. In some possible implementations, the last lens has negative optical power. Because the last lens has negative optical power and is the lens closest to the imaging plane in the optical lens 10, light can be further diverged when passing through the last lens, thereby further expanding the imaging range of the light. This allows the light to be imaged on the photosensitive chip with a larger imaging range, enabling the optical lens 10 to achieve a magnification of 1x or greater, resulting in high-magnification, high-resolution microscopic imaging.

[0098] The effective optical aperture of a lens refers to the maximum diameter of the effective area on the lens that allows light to pass through in the direction perpendicular to the optical axis. In some possible implementations, the effective optical aperture D1 of the first lens L1 and the effective optical aperture D of the last lens are... L The following relation must be satisfied: 1≤D L / D1≤5. In this embodiment, the effective optical aperture D of the last lens... LThe optical effective aperture D1 of the first lens L1 is greater than or equal to that of the last lens. In other words, the image height of light passing through the last lens is greater than the image height of light passing through the first lens L1, thus achieving a magnification effect. An optical lens 10 that satisfies this relationship can achieve a magnification of 1x or greater for microscopic imaging.

[0099] In some embodiments, the optical lens 10 further includes an aperture stop. Specifically, the aperture stop can be an aperture stop for controlling the incident range of light. In embodiments of this application, the aperture stop can be located anywhere within the optical lens 10. For example, the aperture stop can be located on the object side of the first lens L1; exemplaryly, the aperture stop is located between the first lens L1 and the cover lens L0. Alternatively, the aperture stop can be located between the lenses within the optical lens 10.

[0100] In some possible implementations, the aperture stop is located between the second lens L2 and the third lens L3. Since the light has an expanded imaging range after passing through the first lens L1, the light diffused by the first lens L1 first passes through the second lens L2 to converge. The converged light has a concentrated quality, which helps to increase the amount of light passing through the aperture stop and improve image quality. In other implementations, the aperture stop may be located between the third lens L3 and the fourth lens L4.

[0101] Axial chromatic aberration occurs when light passes through a lens because the lens refracts light of different wavelengths differently, resulting in different imaging positions on the light-emitting side. This means that the focal planes of the images of different colors cannot coincide during final imaging, thus preventing the formation of a clear image on a single imaging plane. For example, in this embodiment, after light of different wavelengths passes through the first lens L1, the focal planes of these different wavelengths often cannot lie in the same plane on the light-emitting side of the first lens L1. The second lens L2, having positive optical power, can converge light of different wavelengths through its focusing effect, adjusting the focal planes of different wavelengths and thus correcting axial aberration.

[0102] In some embodiments, the object side of the second lens L2 can be convex. The object side of the second lens L2, which is formed as a convex surface, can adapt to the position of light of various wavelengths after being diffused by the first lens L1, so that light can enter the second lens L2 at different positions in the axial direction, thereby improving the effect of the second lens L2 in correcting optical aberrations and further improving the imaging quality.

[0103] In some possible implementations, the object-side surface of the fourth lens L4 can be concave, which helps to improve the light diffusion effect of the fourth lens L4 and increase the imaging range of its emitting side. Furthermore, the object-side surface of the fourth lens L4 can be adapted to the light emitted from the third lens L3, reducing optical aberrations caused by light passing through the fourth lens L4.

[0104] In embodiments where the optical lens 10 includes a cover lens L0, the cover lens L0 does not have optical power, meaning that multiple rays of the same wavelength parallel to the optical axis will not converge at the same point on the light-emitting side after passing through the cover lens L0. However, light will still be deflected when it enters the cover lens L0 from the air. This is a characteristic of light propagation in different media, and this deflection phenomenon is not equivalent to the optical power mentioned above in this application. In the embodiments of this application, the cover lens L0 is located on the object side of the first lens L1. The cover lens L0 can be used to protect the first lens L1, and when the optical lens 10 is shooting an object at close range, it can prevent the object or other structures from damaging the first lens L1 or other internal structures of the optical lens 10.

[0105] In some embodiments, the thickness of the cover lens L0 along the optical axis may be less than or equal to 1 mm to reduce the influence of the cover lens on light. For example, the thickness of the cover lens L0 along the optical axis may be 0.5 mm or 0.4 mm.

[0106] In some possible implementations, the optical lens 10 includes at least one aspherical lens with a variable surface area among its multiple lenses. For example, this variable surface area aspherical lens is a liquid lens. The principle of a liquid lens is to use a liquid as a lens, changing the focal length by altering the curvature of the liquid.

[0107] Liquid lenses can be categorized based on their operating principles into graded-index lenses, liquid-filled lenses, and electrowetting effect lenses. Graded-index lenses achieve zoom by adjusting the refractive index of the liquid crystal by changing the voltage applied to it, offering advantages such as low control voltage and ease of arraying. Liquid-filled lenses utilize mechanical devices to apply pressure to the liquid within a cavity, causing the liquid to redistribute and altering the lens's radius of curvature. Electrowetting effect lenses are variable-focus lenses that employ the principle of electrowetting on dielectric (EWOD), changing the shape of the liquid droplet and thus altering its focal length by applying an external voltage. This embodiment does not limit the specific structure and operating principle of the liquid lens.

[0108] The optical lens 10 in the above embodiments can achieve zoom of the system focal length through a liquid lens, enabling fast and reliable focusing of the camera. Furthermore, the liquid lens provides a variable focal length, allowing it to adapt to a wider working distance and expanding the application scenarios of the optical lens. Moreover, the liquid lens enables the optical lens 10 to zoom without the need for mechanical drive components, facilitating miniaturization of the optical lens 10 and making it easier to place on the terminal.

[0109] The working distance W of the optical lens 10 generally refers to the distance between the object surface and the front surface of the optical lens 10 in a scenario where the optical lens 10 can achieve clear imaging. Here, the front surface of the optical lens 10 refers to the surface within the optical lens 10 closest to the object side. In embodiments where the optical lens 10 includes a cover lens L0, the front surface of the optical lens 10 is the outer surface of the cover lens L0. In embodiments where no other lens is disposed on the object side of the first lens L1 of the optical lens 10, the front surface of the optical lens 10 is the object side surface of the first lens L1.

[0110] Telephoto lenses can operate at distances ranging from several meters to hundreds of meters, and their system focal length is typically greater than 50mm. In telephoto macro mode, the lens brings distant objects into the frame; therefore, the ratio of the working distance to the system focal length in telephoto macro mode is very large, usually greater than 10. However, in this embodiment, the working distance W of the optical lens 10 in close-range microscopy mode can be very small, enabling macro microscopy with shooting distances ranging from tens of millimeters to as short as a few millimeters. To suit close-range microscopy, the system focal length f of the optical lens 10 can also be relatively small.

[0111] In some embodiments, the working distance W of the optical lens 10 and the system focal length f of the optical lens 10 satisfy the following relationship: 0 ≤ |W / f| ≤ 4.0. In some embodiments, the working distance W of the optical lens 10 can be zero, that is, the subject can be photographed close to the front surface of the optical lens 10. An optical lens that satisfies the above relationship can be adapted to macro microscopic imaging mode and has good microscopic imaging effect, capturing details on the subject more clearly and achieving high magnification and high definition macro imaging performance.

[0112] In some implementations, the working distance W of the optical lens 10 can be less than or equal to 3mm, enabling ultra-close-range macro photography and meeting higher microscopic imaging requirements.

[0113] In some embodiments, the system focal length f of the optical lens 10 can be 0.4mm-1mm. The optical lens 10 that meets the system focal length is suitable for macro photography needs. In ultra-close macro photography scenarios, the optical lens 10 can still achieve focusing and realize high magnification and high-definition imaging.

[0114] The optical lens 10 in the above embodiments can have a small size, which facilitates its placement on electronic products or terminals. In some embodiments, the working distance W of the optical lens 10 and the total optical length TTL of the optical lens 10 can satisfy the relationship 0 ≤ |W / TTL| ≤ 1.0. The optical lens 10 that satisfies this relationship can not only realize macro photography, but also control the total optical length of the optical lens 10 within a small range, which is conducive to the placement of the optical lens 10, especially on portable terminals. The optical lens 10 occupies little space and has good portability, which can promote the popularization of microscopic imaging on terminals.

[0115] The optical lens 10 in this embodiment can be applied to photosensitive elements 20 with different target surface sizes. The target surface size of the photosensitive element 20 can be described by its diagonal length Diag, which specifically refers to the diagonal length of the effective pixel area of ​​the photosensitive element 20. A larger target surface size of the photosensitive element 20 results in a larger effective photosensitive area, which is beneficial for improving image clarity, but also increases cost. In some possible implementations, the optical lens 10 is applied to a camera module. In this camera module, the working distance W of the optical lens 10 and the diagonal length Diag of the photosensitive element 20 can satisfy the relationship 0 ≤ |W / Diag| ≤ 5. In a camera module that satisfies this relationship, the target surface size of the photosensitive element 20 can ensure the imaging integrity of the optical lens 10, achieving a good and clear imaging effect.

[0116] By combining the relationships provided in the foregoing different implementation methods, multiple specific embodiments of this application can be obtained. The imaging effect of the optical lens 10 will be described in detail below with reference to specific embodiments.

[0117] like Figure 4 As shown, in the first embodiment of this application, along the direction from the object side to the image side, a cover lens, a first lens L1 with negative optical power, a second lens L2 with positive optical power, an aperture stop STO, a third lens L3 with positive optical power, a fourth lens L4 with negative optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with positive optical power, an eighth lens L8 with negative optical power, and an imaging plane IMA are arranged sequentially. The object side of the second lens L2 is convex, and the object side of the fourth lens L4 is concave. The design parameters of the optical lens 10 in the first embodiment satisfy the following relationship:

[0118] The working distance W and the system focal length f satisfy the following relationship: |W / f|=0.4 / 0.387=1.033;

[0119] The working distance W and the total optical length TTL satisfy the following relationship: |W / TTL|=0.4 / 4.2=0.095;

[0120] The working distance W and the diagonal length Diag of the photosensitive element 20 satisfy the following relationship: |W / Diag|=0.4 / 5.6=0.071;

[0121] The effective optical aperture D1 of the first lens and the effective optical aperture D8 of the eighth lens satisfy the following relationship:

[0122] D8 / D1=1.887 / 0.605=3.119.

[0123] Based on the design parameters of the first embodiment, in some possible implementations, the basic parameters of the optical lens 10 in the first embodiment are shown in Table 1A below.

[0124] Table 1A: Basic parameters of the optical lens in the first embodiment

[0125] Parameters (units) numerical values Parameters (units) numerical values <![CDATA[Focal length f1 (mm) of the first lens]]> -9.38 <![CDATA[The focal length f2 (mm) of the second lens]]> 2.03 <![CDATA[Focal length f3 (mm) of the third lens]]> 1.42 <![CDATA[Focal length f4 (mm) of the fourth lens]]> -2.43 <![CDATA[Focal length f5 (mm) of the fifth lens]]> 2.03 <![CDATA[Focal length f6 (mm) of the sixth lens]]> 5.82 <![CDATA[Focal length f7 (mm) of the seventh lens]]> 8.60 <![CDATA[Focal length f8 (mm) of the eighth lens]]> -0.85 ImgH(mm) 2.8 NA 0.45 Magnification 3x Total system length TTL (mm) 4.2 System focal length f (mm) 0.387

[0126] In Table 1A above, ImgH represents half the diagonal length Diag of the photosensitive element 20, that is, ImgH is equal to one-half the diagonal length Diag of the photosensitive element 20. NA represents the numerical aperture of the optical lens 10, which measures the angular range of light that the optical lens 10 can collect.

[0127] Based on the design parameters of the first embodiment, in some possible implementations, the radius of curvature, thickness, refractive index, Abbe coefficient, and conic coefficient of each surface in the optical lens 10 of the first embodiment may be as shown in Table 1B below.

[0128] Table 1B: Radius of curvature, thickness, refractive index, and Abbe coefficient of each lens element in an optical lens.

[0129]

[0130] In Table 1B above, R represents the radius of curvature. Th represents the distance from the current surface to the next surface along the optical axis. The Abbe coefficient, also known as the dispersion coefficient, is the degree of dispersion of an optical material at different wavelengths. The conic coefficient represents the rate of change of lens curvature and is used to describe the shape of an aspherical lens. The surface numbers in Table 1B refer to the serial numbers of the surfaces arranged sequentially from the object side to the image side, where OBJ represents the object surface. STO represents the aperture stop. S1 to S18 represent the surfaces of the lens arranged sequentially from the object side to the image side.

[0131] Based on the design parameters of the first embodiment, the aspherical coefficients of each lens in the optical lens 10 of the first embodiment are shown in Table 1C below.

[0132] Table 1C: Aspherical coefficients of various lenses in an optical lens.

[0133]

[0134]

[0135] In Table 1C above, Ai represents the i-th order aspherical coefficient, for example, A2 represents the second order aspherical coefficient.

[0136] As can be seen from Tables 1B and 1C, based on the design surface shape and conic coefficient K provided in Table 1B, and the i-th order aspherical coefficient Ai provided in Table 1C, the aspherical surface shape of each lens in the first embodiment can be obtained.

[0137] In some embodiments, all aspherical surface types z of Qbfs type can be defined using, but are not limited to, the following aspherical formulas:

[0138]

[0139] 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 conic coefficient, and Ai represents the i-th order aspherical coefficient.

[0140] All aspherical surface types z of type Qcon can be constrained using, but are not limited to, the following aspherical formulas:

[0141]

[0142] 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 conic coefficient, and Ai represents the i-th order aspherical coefficient.

[0143] Figure 4 and Figure 5 Schematic diagrams of the optical lens 10 provided in the first embodiment are shown, and these schematic diagrams are simulated images obtained using the aspherical formula described above. Figure 5 The schematic diagram shows the propagation path of light in the optical lens 10 by lines. It should be noted that the light propagation path shown is a simulated light propagation path under ideal conditions and is only for reference to help understand the performance of the optical lens 10. It does not constitute a limitation on the light propagation path of the optical lens 10 in actual applications.

[0144] Figure 6A defocus curve diagram of the optical lens 10 provided in the first embodiment is shown. The vertical axis of the defocus curve diagram represents the Modulation Transfer Function (MTF) value, a parameter used to describe image quality, reflecting the sharpness and resolution of the image formed by the optical lens 10. The horizontal axis of the defocus curve diagram represents the defocus amount, in millimeters. The defocus curve diagram is used to describe the change in light imaging quality of the optical lens 10 at different focusing positions. (Reference) Figure 6 As shown in the defocus curve diagram of the optical lens 10 provided in the first embodiment, the modulation transfer function value corresponding to the highest point of each curve is close to or greater than 0.4, which can reflect that the optical lens 10 has a good imaging effect.

[0145] like Figure 7 As shown, in the second embodiment of this application, along the direction from the object side to the image side, a cover lens, a first lens L1 with negative optical power, a second lens L2 with positive optical power, an aperture stop STO, a third lens L3 with positive optical power, a fourth lens L4 with negative optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with negative optical power, and an imaging plane IMA are arranged sequentially. The object side of the second lens L2 is convex, and the object side of the fourth lens L4 is concave. The design parameters of the optical lens 10 in the second embodiment satisfy the following relationship:

[0146] The working distance W and the system focal length f satisfy the following relationship: |W / f|=0.4 / 0.445=0.899;

[0147] The working distance W and the total optical length TTL satisfy the following relationship: |W / TTL|=0.4 / 5.4=0.074;

[0148] The working distance W and the diagonal length Diag of the photosensitive element 20 satisfy the following relationship: |W / Diag|=0.4 / 3.82=0.104;

[0149] The effective optical aperture D1 of the first lens and the effective optical aperture D7 of the seventh lens satisfy the following relationship:

[0150] D7 / D1 = 1.5 / 0.5 = 3.0.

[0151] Based on the design parameters of the second embodiment, the basic parameters of the optical lens 10 in the second embodiment are shown in Table 2A below.

[0152] Table 2A. Basic parameters of optical lenses

[0153] Parameters (units) numerical values Parameters (units) numerical values The focal length of the first lens element is f1 (mm). -1.930 The focal length of the second lens is f2 (mm). 1.581 The focal length of the third lens is f3 (mm). 1.177 The focal length of the fourth lens element is f4 (mm). -1.968 The focal length of the fifth lens element is f5 (mm). 1.418 The focal length of the sixth lens element is f6 (mm). 2.784 The focal length of the seventh lens element is f7 (mm). -0.824 NA 0.35 ImgH(mm) 2.7 Total system length TTL (mm) 3.82 Magnification 3x System focal length f (mm) 0.445

[0154] Based on the design parameters of the second embodiment, in some possible implementations, the radius of curvature, thickness, refractive index, Abbe coefficient, and conic coefficient of each lens surface in the optical lens 10 of the second embodiment are shown in Table 2B below.

[0155] Table 2B: Radius of curvature, thickness, refractive index, and Abbe coefficient of each lens element in an optical lens.

[0156]

[0157]

[0158] In Table 2B above, R represents the radius of curvature. Th represents the distance from the current surface to the next surface along the optical axis. The Abbe coefficient, also known as the dispersion coefficient, is the degree of dispersion of an optical material at different wavelengths. The conic coefficient represents the rate of change of lens curvature and is used to describe the shape of an aspherical lens. The surface numbers in Table 2B refer to the serial numbers of the surfaces arranged sequentially from the object side to the image side, where OBJ represents the object surface. STO represents the aperture stop. S1 to S18 represent the surfaces of the lens arranged sequentially from the object side to the image side.

[0159] Based on the design parameters of the second embodiment, the aspherical coefficients of each lens in the optical lens 10 of the second embodiment are shown in Table 1C below.

[0160] Table 2C shows the aspherical coefficients of each lens element in an optical lens.

[0161]

[0162]

[0163] In Table 2C above, Ai represents the i-th order aspherical coefficient, for example, A2 represents the second order aspherical coefficient.

[0164] As can be seen from Tables 2B and 2C, based on the design surface shape and conic coefficient K provided in Table 2B, and the i-th order aspherical coefficient Ai provided in Table 2C, the aspherical surface shape of each lens in the second embodiment can be obtained.

[0165] In some embodiments, all aspherical surface types z of Qbfs type can be defined using, but are not limited to, the following aspherical formulas:

[0166]

[0167] 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 conic coefficient, and Ai represents the i-th order aspherical coefficient.

[0168] All aspherical surface types z of type Qcon can be constrained using, but are not limited to, the following aspherical formulas:

[0169]

[0170] 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 conic coefficient, and Ai represents the i-th order aspherical coefficient.

[0171] Figure 7 and Figure 8 Schematic diagrams of the optical lens 10 provided in the second embodiment are shown, and these schematic diagrams are simulated images obtained using the aspherical formula described above. Figure 8 The schematic diagram shows the propagation path of light in the optical lens 10 by lines. It should be noted that the light propagation path shown is a simulated light propagation path under ideal conditions and is only for reference to help understand the performance of the optical lens 10. It does not constitute a limitation on the light propagation path of the optical lens 10 in actual applications.

[0172] Figure 9 A defocus curve diagram of the optical lens 10 provided in the second embodiment is shown. The vertical axis of the defocus curve represents the modulation transfer function (MTF) value, a parameter used to describe image quality, reflecting the sharpness and resolution of the image formed by the optical lens 10. The horizontal axis of the defocus curve represents the defocus amount, in millimeters. (Reference) Figure 9 As shown in the defocus curve diagram of the optical lens 10 provided in the second embodiment, the modulation transfer function value corresponding to the highest point of each curve is close to or greater than 0.4, which can reflect that the optical lens 10 has a good imaging effect.

[0173] like Figure 10 As shown, in the third embodiment of this application, along the direction from the object side to the image side, a first lens L1 with negative optical power, a second lens L2 with positive optical power, an aperture stop STO, a third lens L3 with positive optical power, a fourth lens L4 with negative optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, and an imaging plane IMA are arranged sequentially. The object side of the second lens L2 is convex, and the object side of the fourth lens L4 is concave. The design parameters of the optical lens 10 in the third embodiment satisfy the following relationship:

[0174] The working distance W and the system focal length f satisfy the following relationship: |W / f|=0.07 / 0.515=0.136;

[0175] The working distance W and the total optical length TTL satisfy the following relationship: |W / TTL|=0.07 / 3.93=0.017;

[0176] The working distance W and the diagonal length Diag of the photosensitive element 20 satisfy the following relationship: |W / Diag|=0.07 / 5.0=0.014;

[0177] The effective optical aperture D1 of the first lens and the effective optical aperture D6 of the sixth lens satisfy the following relationship:

[0178] D6 / D1 = 1.1 / 0.4 = 2.75.

[0179] Based on the design parameters of the third embodiment, the basic parameters of the optical lens 10 in the third embodiment are shown in Table 3A below.

[0180] Table 3A. Basic Parameters of Optical Lenses

[0181] Parameters (units) numerical values Parameters (units) numerical values <![CDATA[Focal length f1 (mm) of the first lens]]> -2.011 <![CDATA[The focal length f2 (mm) of the second lens]]> 3.430 <![CDATA[Focal length f3 (mm) of the third lens]]> 1.151 <![CDATA[Focal length f4 (mm) of the fourth lens]]> -2.563 <![CDATA[Focal length f5 (mm) of the fifth lens]]> 6.951 <![CDATA[Focal length f6 (mm) of the sixth lens]]> -1.198 ImgH(mm) 2.5 NA 0.4 Magnification 3x Total system length TTL (mm) 3.93 System focal length f (mm) 0.515

[0182] Based on the design parameters of the third embodiment, in some possible implementations, the radius of curvature, thickness, refractive index, Abbe coefficient, and conic coefficient of each lens surface in the optical lens 10 of the third embodiment are shown in Table 3B below.

[0183] Table 3B: Radius of curvature, thickness, refractive index, and Abbe coefficient of each lens element in an optical lens.

[0184]

[0185] In Table 3B above, R represents the radius of curvature. Th represents the distance from this surface to the next surface along the optical axis. The Abbe coefficient, also known as the dispersion coefficient, is the degree of dispersion of an optical material at different wavelengths. The conic coefficient represents the rate of change of the lens curvature and is used to describe the shape of an aspherical lens.

[0186] The surface numbers in Table 3B above refer to the serial numbers of each surface arranged sequentially from the object side to the image side. Among them, OBJ represents the object surface. STO represents the aperture stop. S1 to S15 represent the surfaces of each lens arranged sequentially from the object side to the image side.

[0187] Based on the design parameters of the third embodiment, in some possible implementations, the aspherical coefficients of each lens in the optical lens 10 of the third embodiment are shown in Table 3C below.

[0188] Table 3C shows the aspherical coefficients of the lenses in an optical lens.

[0189]

[0190]

[0191] In Table 3C above, Ai represents the i-th order aspherical coefficient, for example, A2 represents the second order aspherical coefficient.

[0192] Based on the design surface shape and conic coefficient K provided in Table 3B, and the i-th order aspherical coefficient Ai provided in Table 3C, the aspherical surface shape of each lens in the third embodiment can be obtained.

[0193] In some embodiments, all aspherical surface types z of Qbfs type can be defined using, but are not limited to, the following aspherical formulas:

[0194]

[0195] 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 conic coefficient, and Ai represents the i-th order aspherical coefficient.

[0196] All aspherical surface types z of type Qcon can be constrained using, but are not limited to, the following aspherical formulas:

[0197]

[0198] 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 conic coefficient, and Ai represents the i-th order aspherical coefficient.

[0199] Figure 10 and Figure 11 Schematic diagrams of the optical lens 10 provided in the third embodiment are shown, and these schematic diagrams are simulated images obtained using the aspherical formula described above. Figure 11 The schematic diagram shows the propagation path of light in the optical lens 10 by lines. It should be noted that the light propagation path shown is a simulated light propagation path under ideal conditions and is only for reference to help understand the performance of the optical lens 10. It does not constitute a limitation on the light propagation path of the optical lens 10 in actual applications.

[0200] Figure 12 A defocus curve diagram of the optical lens 10 provided in the third embodiment is shown. The vertical axis of the defocus curve diagram represents the Modulation Transfer Function (MTF) value, a parameter used to describe image quality, reflecting the sharpness and resolution of the image formed by the optical lens 10. The horizontal axis of the defocus curve diagram represents the defocus amount, in millimeters. The defocus curve diagram is used to describe the change in light imaging quality of the optical lens 10 at different focusing positions. (Reference) Figure 12As shown in the defocus curve diagram of the optical lens 10 provided in the third embodiment, the modulation transfer function value corresponding to the highest point of each curve is close to or greater than 0.4, which can demonstrate that the optical lens 10 has a good imaging effect.

[0201] like Figure 13 As shown, in the fourth embodiment of this application, along the direction from the object side to the image side, the following are arranged sequentially: a cover lens, a first lens L1 with negative optical power, a second lens L2 with positive optical power, an aperture stop STO, a third lens L3 with positive optical power, a fourth lens L4 with negative optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with positive optical power, an eighth lens L8 with negative optical power, and an imaging plane IMA. The object side of the second lens L2 is convex, and the object side of the fourth lens L4 is concave. The design parameters of the optical lens 10 in the fourth embodiment satisfy the following relationship:

[0202] The working distance W and the system focal length f satisfy the following relationship: |W / f|=0.4 / 0.416=0.961;

[0203] The working distance W and the total optical length TTL satisfy the following relationship: |W / TTL|=0.4 / 4.2=0.096;

[0204] The working distance W and the diagonal length Diag of the photosensitive element 20 satisfy the following relationship: |W / Diag|=0.07 / 7.2=0.010;

[0205] The effective optical aperture D1 of the first lens and the effective optical aperture D8 of the eighth lens satisfy the following relationship:

[0206] D8 / D1 = 1.99 / 0.4 = 4.975.

[0207] Based on the design parameters of the fourth embodiment, the basic parameters of the optical lens 10 in the fourth embodiment are shown in 4A below.

[0208] Table 4A. Basic Parameters of Optical Lenses

[0209] Parameters (units) numerical values Parameters (units) numerical values <![CDATA[Focal length f1 (mm) of the first lens]]> -4.50 <![CDATA[The focal length f2 (mm) of the second lens]]> 1.79 <![CDATA[Focal length f3 (mm) of the third lens]]> 1.34 <![CDATA[Focal length f4 (mm) of the fourth lens]]> -2.43 <![CDATA[Focal length f5 (mm) of the fifth lens]]> 2.29 <![CDATA[Focal length f6 (mm) of the sixth lens]]> 6.03 <![CDATA[Focal length f7 (mm) of the seventh lens]]> 25.41 <![CDATA[Focal length f8 (mm) of the eighth lens]]> -0.895 ImgH(mm) 3.6 NA 0.4 Magnification 3x Total system length TTL (mm) 4.2 System focal length f (mm) 0.416

[0210] Based on the design parameters of the fourth embodiment, in some possible implementations, the radius of curvature, thickness, refractive index, Abbe coefficient, and conic coefficient of each lens surface in the optical lens 10 of the fourth embodiment are shown in Table 4B below.

[0211] Table 4B: Radius of curvature, thickness, refractive index, and Abbe coefficient of each lens element in an optical lens.

[0212]

[0213] In Table 4B above, R represents the radius of curvature. Th represents the distance from the current surface to the next surface along the optical axis. The Abbe coefficient, also known as the dispersion coefficient, is the degree of dispersion of an optical material at different wavelengths. The conic coefficient represents the rate of change of lens curvature and is used to describe the shape of an aspherical lens. The surface numbers in Table 4B refer to the serial numbers of the surfaces arranged sequentially from the object side to the image side, where OBJ represents the object surface. STO represents the aperture stop. S1 to S18 represent the surfaces of the lens arranged sequentially from the object side to the image side.

[0214] Based on the design parameters of the fourth embodiment, in some possible implementations, the aspherical coefficients of each lens in the optical lens 10 of the fourth embodiment are shown in Table 4C below.

[0215] Table 4C shows the aspherical coefficients of each lens element in an optical lens.

[0216] Face number A4 A6 A8 A10 A12 A14 A16 S3 -0.0683719 -0.0020290 -0.0029175 0.0024179 -0.0018394 0.0011770 -0.0005105 S4 -0.0531395 -0.0038917 -0.0077456 0.0085711 -0.0079756 0.0059902 -0.0040103 S5 0.0773567 -0.0336826 0.0108163 -0.0032091 -0.0000951 0.0007978 -0.0006967 S6 -0.0360067 0.0066297 -0.0025814 0.0010375 -0.0005272 0.0002721 -0.0001416 S7 -0.0116339 -0.0036571 -0.0000999 0.0000209 0.0000427 0.0000198 0.0000159 S8 -0.0414024 0.0011327 0.0016432 -0.0009133 0.0003463 -0.0000844 0.0000150 S9 0.0152171 -0.0033366 0.0028624 -0.0012172 0.0004396 -0.0001261 0.0000279 S10 -0.0251534 -0.0006322 0.0011614 -0.0007249 -0.0000948 -0.0000876 -0.0000660 S11 0.0500984 0.0067291 0.0021805 0.0011431 0.0002943 0.0000836 0.0000370 S12 -0.0215740 0.0046217 -0.0004963 0.0003958 0.0000021 0.0000423 -0.0000046 S13 -0.0946270 -0.0222932 -0.0065400 -0.0007966 0.0002323 0.0001281 0.0002047 S14 -0.1209132 0.0102155 0.0122409 -0.0006856 0.0021423 -0.0029858 0.0008648 S15 0.3741401 0.2473356 -0.0829302 -0.0224298 0.0128804 -0.0067241 -0.0072118 S16 -0.4373488 -0.0730188 0.1011055 -0.0593233 0.0314288 -0.0131905 0.0076152 S17 -0.4373488 -0.0730188 0.1011055 -0.0593233 0.0314288 -0.0131905 0.0076152 S18 0.5489746 0.0904928 0.1148110 0.0244345 0.0942235 0.0138887 0.0210932 Face number A18 A20 A22 A24 A26 A28 A30 S3 0.0001861 -0.0000299 -0.0000025 0.0000080 0.0000000 0.0000000 0.0000000 S4 0.0024419 -0.0013713 0.0007023 -0.0003221 0.0001318 -0.0000476 0.0000126 S5 0.0004035 -0.0001453 -0.0000109 0.0000797 -0.0000812 0.0000510 -0.0000187 S6 0.0000708 -0.0000305 0.0000056 0.0000106 -0.0000156 0.0000099 -0.0000001 S7 0.0000102 0.0000084 0.0000069 0.0000048 0.0000035 0.0000024 0.0000012 S8 -0.0000006 0.0000032 -0.0000034 0.0000026 -0.0000005 0.0000004 -0.0000004 S9 -0.0000041 0.0000039 -0.0000042 0.0000022 -0.0000020 -0.0000004 -0.0000005 S10 0.0000005 -0.0000089 -0.0000084 -0.0000028 -0.0000040 0.0000042 -0.0000046 S11 -0.0000045 -0.0000021 -0.0000036 -0.0000054 -0.0000029 -0.0000024 -0.0000005 S12 0.0000039 -0.0000008 0.0000000 0.0000000 0.0000000 0.0000000 0.0000000 S13 0.0000425 0.0000303 -0.0000207 -0.0000094 -0.0000024 -0.0000058 -0.0000028 S14 -0.0005538 0.0003885 -0.0001229 0.0000940 -0.0000431 -0.0000069 0.0000021 S15 -0.0056654 0.0040244 -0.0025975 -0.0021755 0.0008862 -0.0005807 -0.0002903 S16 -0.0052725 0.0019280 -0.0006980 0.0003452 -0.0001776 0.0000547 0.0000308 S17 -0.0052725 0.0019280 -0.0006980 0.0003452 -0.0001776 0.0000547 0.0000308 S18 0.0260934 0.0102971 0.0031453 0.0040449 0.0018708 0.0009191 0.0013255

[0217] In Table 4C above, Ai represents the i-th order aspherical coefficient, for example, A2 represents the second order aspherical coefficient.

[0218] Based on the design surface shape and conic coefficient K provided in Table 4B, and the i-th order aspherical coefficient Ai provided in Table 4C, the aspherical surface shape of each lens in the fourth embodiment can be obtained.

[0219] In some embodiments, all aspherical surface types z of Qbfs type can be defined using, but are not limited to, the following aspherical formulas:

[0220]

[0221] 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 conic coefficient, and Ai represents the i-th order aspherical coefficient.

[0222] All aspherical surface types z of type Qcon can be constrained using, but are not limited to, the following aspherical formulas:

[0223]

[0224] 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 conic coefficient, and Ai represents the i-th order aspherical coefficient.

[0225] Figure 13 and Figure 14 Schematic diagrams of the optical lens 10 provided in the fourth embodiment are shown, and these schematic diagrams are simulated images obtained using the aspherical formula described above. Figure 14 The schematic diagram shows the propagation path of light in the optical lens 10 by lines. It should be noted that the light propagation path shown is a simulated light propagation path under ideal conditions and is only for reference to help understand the performance of the optical lens 10. It does not constitute a limitation on the light propagation path of the optical lens 10 in actual applications.

[0226] Figure 15 A defocus curve diagram of the optical lens 10 provided in the fourth embodiment is shown. The vertical axis of the defocus curve diagram represents the Modulation Transfer Function (MTF) value, a parameter used to describe image quality, reflecting the sharpness and resolution of the image formed by the optical lens 10. The horizontal axis of the defocus curve diagram represents the defocus amount, in millimeters. The defocus curve diagram is used to describe the change in light imaging quality of the optical lens 10 at different focusing positions. (Reference) Figure 15 As shown in the defocus curve diagram of the optical lens 10 provided in the fourth embodiment, the modulation transfer function value corresponding to the highest point of each curve is greater than 0.4, which can demonstrate that the optical lens 10 has a good imaging effect.

[0227] like Figure 16 As shown, in the fifth embodiment of this application, along the direction from the object side to the image side, the following are arranged sequentially: a cover lens, a first lens L1 with negative optical power, a second lens L2 with positive optical power, an aperture stop STO, a third lens L3 with positive optical power, a fourth lens L4 with negative optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with positive optical power, an eighth lens L8 with negative optical power, and an imaging plane IMA. The object-side surface of the second lens L2 is convex, and the object-side surface of the fourth lens L4 is concave. The design parameters of the optical lens 10 in the fifth embodiment satisfy the following relationship:

[0228] The working distance W and the system focal length f satisfy the following relationship: |W / f|=1.0 / 0.663=1.508;

[0229] The working distance W and the total optical length TTL satisfy the following relationship: |W / TTL|=1.0 / 3.3=0.303;

[0230] The working distance W and the diagonal length Diag of the photosensitive element 20 satisfy the following relationship: |W / Diag|=1.0 / 3.6=0.277;

[0231] The effective optical aperture D1 of the first lens and the effective optical aperture D8 of the eighth lens satisfy the following relationship:

[0232] D8 / D1 = 1.33 / 0.27 = 4.925.

[0233] Based on the design parameters of the fifth embodiment, the basic parameters of the optical lens 10 in the fifth embodiment are shown in 5A below.

[0234] Table 5A. Basic Parameters of Optical Lenses

[0235] Parameters (units) numerical values Parameters (units) numerical values <![CDATA[Focal length f1 (mm) of the first lens]]> -3.427 <![CDATA[The focal length f2 (mm) of the second lens]]> 1.685 <![CDATA[The focal length f3 (mm) of the third lens]]> 1.044 <![CDATA[Focal length f4 (mm) of the fourth lens]]> -1.479 <![CDATA[Focal length f5 (mm) of the fifth lens]]> 2.736 <![CDATA[Focal length f6 (mm) of the sixth lens]]> 7.920 <![CDATA[The focal length f7 (mm) of the seventh lens]]> 4.806 <![CDATA[Focal length f8 (mm) of the eighth lens]]> -1.663 ImgH(mm) 1.8 NA 0.14 Magnification 1.0x Total system length TTL (mm) 3.3 System focal length f (mm) 0.663

[0236] Based on the design parameters of the fifth embodiment, in some possible implementations, the radius of curvature, thickness, refractive index, Abbe coefficient, and conic coefficient of each lens surface in the optical lens 10 of the fifth embodiment are shown in Table 5B below.

[0237] Table 5B: Radius of curvature, thickness, refractive index, and Abbe coefficient of each lens element in an optical lens.

[0238]

[0239]

[0240] In Table 5B above, R represents the radius of curvature. Th represents the distance from the current surface to the next surface along the optical axis. The Abbe coefficient, also known as the dispersion coefficient, is the degree of dispersion of an optical material at different wavelengths. The conic coefficient represents the rate of change of lens curvature and is used to describe the shape of an aspherical lens. The surface numbers in Table 5B refer to the serial numbers of the surfaces arranged sequentially from the object side to the image side, where OBJ represents the object surface. STO represents the aperture stop. S1 to S18 represent the surfaces of the lens arranged sequentially from the object side to the image side.

[0241] Based on the design parameters of the fifth embodiment, in some possible implementations, the aspherical coefficients of each lens in the optical lens 10 of the fifth embodiment are shown in Table 5C below.

[0242] Table 5C: Aspherical coefficients of various lenses in an optical lens.

[0243]

[0244]

[0245] In Table 5C above, Ai represents the i-th order aspherical coefficient, for example, A2 represents the second order aspherical coefficient.

[0246] Based on the design surface shape and conic coefficient K provided in Table 5B, and the i-th order aspherical coefficient Ai provided in Table 5C, the aspherical surface shape of each lens in the fifth embodiment can be obtained.

[0247] In some embodiments, all aspherical surface types z of Qbfs type can be defined using, but are not limited to, the following aspherical formulas:

[0248]

[0249] 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 conic coefficient, and Ai represents the i-th order aspherical coefficient.

[0250] All aspherical surface types z of type Qcon can be constrained using, but are not limited to, the following aspherical formulas:

[0251]

[0252] 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 conic coefficient, and Ai represents the i-th order aspherical coefficient.

[0253] Figure 16 and Figure 17 Schematic diagrams of the optical lens 10 provided in the fifth embodiment are shown, and these schematic diagrams are simulated images obtained using the aspherical formula described above. Figure 17 The schematic diagram shows the propagation path of light in the optical lens 10 by lines. It should be noted that the light propagation path shown is a simulated light propagation path under ideal conditions and is only for reference to help understand the performance of the optical lens 10. It does not constitute a limitation on the light propagation path of the optical lens 10 in actual applications.

[0254] Figure 18 A defocus curve diagram of the optical lens 10 provided in the fifth embodiment is shown. The vertical axis of the defocus curve diagram represents the Modulation Transfer Function (MTF) value, a parameter used to describe image quality, reflecting the sharpness and resolution of the image formed by the optical lens 10. The horizontal axis of the defocus curve diagram represents the defocus amount, in millimeters. The defocus curve diagram is used to describe the change in light imaging quality of the optical lens 10 at different focusing positions. (Reference) Figure 18 As shown in the defocus curve diagram of the optical lens 10 provided in the fifth embodiment, the modulation transfer function value corresponding to the highest point of most light rays is greater than 0.4, which shows that the optical lens 10 has a good imaging effect.

[0255] like Figure 19As shown, in the sixth embodiment of this application, along the direction from the object side to the image side, the following are arranged sequentially: a cover lens, a first lens L1 with negative optical power, a second lens L2 with positive optical power, an aperture stop STO, a third lens L3 with positive optical power, a fourth lens L4 with negative optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with negative optical power, an eighth lens L8 with negative optical power, and an imaging plane IMA. The object side of the second lens L2 is convex, and the object side of the fourth lens L4 is concave. The design parameters of the optical lens 10 in the sixth embodiment satisfy the following relationship:

[0256] The working distance W and the system focal length f satisfy the following relationship: |W / f|=2.0 / 0.5=4;

[0257] The working distance W and the total optical length TTL satisfy the following relationship: |W / TTL|=2.0 / 2.78=0.72;

[0258] The working distance W and the diagonal length Diag of the photosensitive element 20 satisfy the following relationship: |W / Diag|=2.0 / 0.8=2.5;

[0259] The effective optical aperture D1 of the first lens and the effective optical aperture D8 of the eighth lens satisfy the following relationship:

[0260] D8 / D1 = 0.32 / 0.17 = 1.88.

[0261] Based on the design parameters of the sixth embodiment, the basic parameters of the optical lens 10 in the sixth embodiment are shown in 6A below.

[0262] Table 6A. Basic Parameters of Optical Lenses

[0263] Parameters (units) numerical values Parameters (units) numerical values <![CDATA[The focal length f1 (mm) of the first lens]]> -3.915 <![CDATA[The focal length f2 (mm) of the second lens]]> 1.565 <![CDATA[The focal length f3 (mm) of the third lens]]> 0.993 <![CDATA[Focal length f4 (mm) of the fourth lens]]> -1.493 <![CDATA[Focal length f5 (mm) of the fifth lens]]> 2.804 <![CDATA[Focal length f6 (mm) of the sixth lens]]> 8.557 <![CDATA[Focal length f7 (mm) of the seventh lens]]> -121.2 <![CDATA[Focal length f8 (mm) of the eighth lens]]> -1.269 ImgH(mm) 0.4 NA 0.1 Magnification 1x Total system length TTL (mm) 2.78mm System focal length f (mm) 0.5

[0264] Based on the design parameters of the sixth embodiment, in some possible implementations, the radius of curvature, thickness, refractive index, Abbe coefficient, and conic coefficient of each lens surface in the optical lens 10 of the sixth embodiment are shown in Table 6B below.

[0265] Table 6B: Radius of curvature, thickness, refractive index, and Abbe coefficient of each lens element in an optical lens.

[0266]

[0267] In Table 6B above, R represents the radius of curvature. Th represents the distance from the current surface to the next surface along the optical axis. The Abbe coefficient, also known as the dispersion coefficient, is the degree of dispersion of an optical material at different wavelengths. The conic coefficient represents the rate of change of lens curvature and is used to describe the shape of an aspherical lens. The surface numbers in Table 6B refer to the serial numbers of the surfaces arranged sequentially from the object side to the image side, where OBJ represents the object surface. STO represents the aperture stop. S1 to S18 represent the surfaces of the lens arranged sequentially from the object side to the image side.

[0268] Based on the design parameters of the sixth embodiment, in some possible implementations, the aspherical coefficients of each lens in the optical lens 10 of the sixth embodiment are shown in Table 6C below.

[0269] Table 6C shows the aspherical coefficients of each lens element in an optical lens.

[0270]

[0271]

[0272] In Table 6C above, Ai represents the i-th order aspherical coefficient, for example, A2 represents the second order aspherical coefficient.

[0273] Based on the design surface shape and conic coefficient K provided in Table 6B, and the i-th order aspherical coefficient Ai provided in Table 6C, the aspherical surface shape of each lens in the sixth embodiment can be obtained.

[0274] In some embodiments, all aspherical surface types z of Qbfs type can be defined using, but are not limited to, the following aspherical formulas:

[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 conic coefficient, and Ai represents the i-th order aspherical coefficient.

[0277] All aspherical surface types z of type Qcon can be constrained using, but are not limited to, the following aspherical formulas:

[0278]

[0279] 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 conic coefficient, and Ai represents the i-th order aspherical coefficient.

[0280] Figure 19 and Figure 20Schematic diagrams of the optical lens 10 provided in the sixth embodiment are shown, and these schematic diagrams are simulated images obtained using the aspherical formula described above. Figure 20 The schematic diagram shows the propagation path of light in the optical lens 10 by lines. It should be noted that the light propagation path shown is a simulated light propagation path under ideal conditions and is only for reference to help understand the performance of the optical lens 10. It does not constitute a limitation on the light propagation path of the optical lens 10 in actual applications.

[0281] Figure 21 A defocus curve diagram of the optical lens 10 provided in the sixth embodiment is shown. The vertical axis of the defocus curve diagram represents the Modulation Transfer Function (MTF) value, a parameter used to describe image quality, reflecting the sharpness and resolution of the image formed by the optical lens 10. The horizontal axis of the defocus curve diagram represents the defocus amount, in millimeters. The defocus curve diagram is used to describe the change in light imaging quality of the optical lens 10 at different focusing positions. (Reference) Figure 21 As shown in the defocus curve diagram of the optical lens 10 provided in the sixth embodiment, the modulation transfer function value corresponding to the highest point of most light rays is greater than 0.4, which shows that the optical lens 10 has a good imaging effect.

[0282] The above are merely some embodiments and implementation methods of this application. The scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical lens, characterized in that, It includes multiple lenses with optical power, and the multiple lenses with optical power include at least a first lens (L1), a second lens (L2), a third lens (L3) and a fourth lens (L4) arranged sequentially along the direction from the object side to the image side; Wherein, the first lens (L1) is the lens closest to the object side among the plurality of lenses with optical power, and the first lens (L1) has negative optical power; The second lens (L2) has positive optical power; The third lens (L3) has positive optical power; The fourth lens (L4) has negative optical power.

2. The optical lens according to claim 1, characterized in that, The working distance W of the optical lens (10) and the system focal length f of the optical lens (10) satisfy the following relationship: 0≤|W / f|≤4.

0.

3. The optical lens according to claim 1, characterized in that, The system focal length f of the optical lens (10) is 0.4mm-1mm.

4. The optical lens according to claim 1, characterized in that, The working distance W of the optical lens (10) and the total optical length TTL of the optical lens (10) satisfy the following relationship: 0≤|W / TTL|≤1.

0.

5. The optical lens according to claim 1, characterized in that, The lens closest to the imaging plane among the plurality of lenses with optical power is the last lens, and the last lens has negative optical power.

6. The optical lens according to claim 5, characterized in that, The effective optical aperture D1 of the first lens (10) and the effective optical aperture D of the last lens L The following relationship must be satisfied: 1≤D L / D1≤5。 7. The optical lens according to any one of claims 1-6, characterized in that, The object side of the second lens (L2) is convex.

8. The optical lens according to any one of claims 1-6, characterized in that, The object side of the fourth lens (L4) is concave.

9. The optical lens according to any one of claims 1-6, characterized in that, The optical lens (10) also includes an aperture stop located between the second lens and the third lens.

10. The optical lens according to any one of claims 1-6, characterized in that, The optical lens (10) includes at least one liquid lens with a variable focal length.

11. The optical lens according to any one of claims 1-6, characterized in that, The optical lens (10) also includes a cover lens (L0), which is located on the object side of the first lens (L1).

12. A camera module, characterized in that, It includes a photosensitive element (20) and an optical lens (10) as claimed in any one of claims 1-11, wherein the photosensitive element (20) is located on the image side of the optical lens (10).

13. The camera module according to claim 12, characterized in that, The working distance W of the optical lens (10) and the diagonal length Diag of the photosensitive element (20) satisfy the following relationship: 0≤|W / Diag|≤5.

14. A terminal, characterized in that, The system includes an image processor and a camera module (100) as described in claim 12 or 13, wherein the image processor (300) is communicatively connected to the camera module (100), the camera module (100) is used to acquire an image and input the image into the image processor (300), and the image processor (300) is used to perform image processing on the image.

Images