Optical lenses, lens modules and electronic equipment

Abstract

The present application discloses an optical lens, a lens module, and an electronic device, comprising: a first optical element, comprising a light-proof area and a light-transmitting area, the light-transmitting area being used to allow light to pass through, the image side of the light-proof area being provided with a convex reflective surface; a lens group, comprising a plurality of lenses arranged sequentially from the object side to the image side; a second optical element, annularly arranged around the periphery of the lens group, the second optical element having a concave reflective surface, the concave reflective surface converging the light and reflecting it onto the convex reflective surface, the convex reflective surface then reflecting the light onto the lens group, and the lens group forming an image of the light on a focusing plane; the optical lens satisfies the relationship: 0>f 1‑2 / f 3‑n The optical lens in this application can fold the system optical path, thereby significantly shortening the axial space, shortening the total optical length of the optical lens, and miniaturizing the lens shape.

Description

Technical Field

[0001] The present application relates to the field of optical lenses, and more specifically, to an optical lens, a lens module and an electronic device. Background Art

[0002] In recent years, mobile electronic devices equipped with camera lenses (such as digital cameras, smart phones, laptops, tablets, etc.) are rapidly developing and becoming popular. At the same time, electronic devices have also put forward new requirements for the performance of camera lenses.

[0003] For distant objects, the longer the focal length of a camera lens, the higher the resolution. Long-focal-length lenses are useful in a wide range of applications, including capturing scenery and people from a distance, filming stages and sports events from the stands, photographing animals in the wild, and using an auxiliary lens for close-up photography.

[0004] However, due to the trend of lightweight and thin mobile electronic devices, how to further shorten the total optical length of the camera lens to achieve miniaturization while achieving a long focal length has become one of the problems that camera lens manufacturers are trying to solve. Summary of the Invention

[0005] The present application provides an optical lens that can further shorten the total optical length of a camera lens to achieve miniaturization while achieving a long focal length. In addition, the present application also provides a lens module using the optical lens and an electronic device using the lens module.

[0006] In a first aspect, an optical lens is provided, comprising:

[0007] The first optical element includes a light-proof area in the middle and a light-transmitting area on the periphery, wherein the light-transmitting area is used for allowing light to pass through, and a convex reflecting surface is provided on the image side of the light-proof area;

[0008] A lens assembly comprising a plurality of lenses arranged sequentially from the object side to the image side;

[0009] The second optical element is annularly sleeved on the periphery of the lens group, and the second optical element has a concave reflecting surface.

[0010] The concave reflecting surface is used to converge the light and reflect it to the convex reflecting surface, the convex reflecting surface is used to diverge the light and reflect it to the lens group, and the lens group is used to image the light on a focal plane.

[0011] In addition, the optical lens also satisfies the following relationship:

[0012] 0>f 1-2 / f 3-n >-3.5;

[0013] Among them, f 1-2 is the combined focal length of the first optical element and the second optical element, f 3-n is the combined focal length of the lens group.

[0014] The left side of the optical lens is the object side, and the right side is the image side. Light originates from the object side of the optical lens, enters the interior of the optical lens through the light-transmitting area of ​​the first optical element, and is transmitted to the concave reflective surface of the second optical element. The concave reflective surface converges the light and reflects it to the convex reflective surface of the first optical element. The convex reflective surface diverges the light and reflects it to the lens group. The multiple lenses of the lens group refract the light multiple times before forming an image on the focal plane.

[0015] An optical lens composed of pure lenses does not have concave and convex reflective surfaces. Light travels from the object side to the image side of the lens group, requiring a larger axial space to meet the adjustment requirements of the system's optical path, which is not conducive to the design of a compact lens.

[0016] The optical lens in the present application is a folding optical lens composed of a convex reflective surface, a concave reflective surface and multiple lens elements. The convex reflective surface and the concave reflective surface can fold the system optical path, thereby greatly shortening the axial space and allowing the system optical path to complete imaging within a smaller light incident space, thereby making the entire lens structure more compact, and further reducing the volume and weight. It can shorten the total optical length of the optical lens and miniaturize the lens appearance to meet the requirements of lightweight and thin mobile electronic devices.

[0017] The lens group in this application is composed of multiple lenses. In addition to meeting the lens performance and image quality requirements such as lens focal length, spherical aberration, coma, astigmatism, field curvature, etc., there are also sufficient parameter variables (such as the order of each lens in the lens group along the optical path, lens material, refractive index, curvature radius, etc.) to optimize the lens layout and structure design, so as to further shorten the total optical length of the optical lens while maintaining the same imaging quality.

[0018] The optical lens in this application also has the advantages of low design difficulty and manufacturing cost. The specific reason is that in an optical lens composed of pure lenses, it is impossible for all colors of light waves to fall completely on the focal point. Instead, they are scattered elsewhere, thus forming chromatic aberration. It is necessary to control the surface shape, thickness and other parameters of the lens to eliminate chromatic aberration. In contrast, the optical lens in this application first reflects and transmits light after entering, thereby avoiding the chromatic aberration problem caused by refraction. Although subsequent light will also enter the lens group and be refracted, the difficulty of correcting chromatic aberration is relatively low, thereby reducing the design difficulty and manufacturing cost of the lens group.

[0019] In addition to having a convex reflective surface, the first optical element in this application also has a light-transmitting area that refracts incident light. Therefore, the surface shape, radius of curvature, thickness and other parameters of the light-transmitting area and the convex reflective surface can be adjusted to achieve structural optimization and aberration adjustment of the entire optical lens. Compared with the variable parameters that can be achieved by arranging two lenses (lens and reflector), this application only requires one first optical element to have the same number of variable parameters for the optical lens to be optimized and adjusted. Therefore, the use of the first optical element in this application can also reduce the number of lens designs and production costs, thereby making the entire optical lens structure more compact, and further reducing the volume and weight of the system.

[0020] The optical lens in this application also satisfies the relationship: 0>f 1-2 / f 3-n >-3.5. This relationship can limit the axial spatial length between the first optical element and the second optical element, as well as the axial spatial length of the lens group, which is beneficial for the optical lens of the present application to have good telephoto characteristics, shorten the overall optical length of the lens to achieve module miniaturization, and at the same time have good imaging quality.

[0021] Optionally, the first optical element and the convex reflective surface can be an integrated structure or a split structure, that is, the base where the convex reflective surface is located and the first optical element are two parts, and the two parts are connected to fix the convex reflective surface on the image side of the opaque area of ​​the first optical element.

[0022] Optionally, the first optical element, the lens group and the second optical element are assembled through a lens barrel, and the first optical element also has the function of sealing the lens barrel to prevent dust from entering the lens barrel and contaminating the lenses.

[0023] Optionally, the object-side surface and the image-side surface of the light-transmitting region of the first optical element may both be planes.

[0024] Optionally, the object side surface and image side surface of the light-transmitting area of ​​the first optical element are both aspherical surfaces with a certain optical focal length. The optical focal length of the two surfaces is reasonably distributed, so that the light-transmitting area has a negative optical focal length, so that the light entering is not contracted and focused, but is bent outward.

[0025] Optionally, the convex reflective surface of the first optical element and the concave reflective surface of the second optical element are both spherical curved surfaces.

[0026] Optionally, the convex reflective surface of the first optical element and the concave reflective surface of the second optical element are both aspherical curved surfaces.

[0027] Optionally, the optical lens further includes an aperture stop, and the aperture stop may be further provided on the third lens. The effective light opening of the aperture stop may be circular in shape, the surface of the effective light opening may be perpendicular to the optical axis, and the center of the effective light opening may be located on the optical axis.

[0028] Optionally, the aperture stop may be made of any one of plastic, aluminum alloy, beryllium aluminum alloy, titanium alloy, aluminum, beryllium, etc.

[0029] Optionally, the optical lens further includes an infrared cut-off filter, which is arranged on the image side of the last lens in the lens group.

[0030] Optionally, the first optical element and the second optical element may be made of plastic or glass, or other materials that can meet the refractive index requirements.

[0031] Optionally, the convex reflective surface and the concave reflective surface may be metal reflective film layers prepared by evaporation or sputtering, and the metal may be nickel, aluminum, silver, gold, or alloys thereof.

[0032] In one possible design, the optical lens satisfies the following relationship:

[0033] TTL / f<0.5.

[0034] Wherein, TTL is the total optical length of the optical lens, and f is the focal length of the optical lens.

[0035] The above relationship limits the range of the ratio of the focal length of the optical lens to the total optical length, which is conducive to proportional scaling when the optical lens architecture is the same.

[0036] In one possible design, the optical lens satisfies the following relationship:

[0037] 1≤WD3 / EPD≤1.1.

[0038] Wherein, WD3 is the diameter of the image formed on the object side by the first lens in the lens group through the first optical element and the second optical element, and EPD is the entrance pupil diameter of the optical lens.

[0039] The above relationship is conducive to the reasonable adjustment of the optical path, which can effectively limit the optical path outside the field of view or the non-imaging optical path from reaching the effective image plane, avoid damage to the imaging performance, and ensure that the imaging system has good imaging quality.

[0040] In one possible design, the optical lens satisfies the following relationship:

[0041] Imgh / TTL>0.1.

[0042] Here, Imgh is half of the diagonal length of the pixel area of ​​the electronic photosensitive element on the focusing plane.

[0043] The above relationship, while ensuring that the optical lens has a high-pixel image, limits the total optical length of the optical lens, which is conducive to better reducing the overall size and achieving miniaturization.

[0044] In one possible design, the optical lens satisfies the following relationship:

[0045] Imgh / D1>0.3.

[0046] Wherein, D1 is the radius of the outer circumference of the first optical element.

[0047] The above relationship limits the radial space of the optical lens while ensuring that the optical lens has a high-pixel image, which is conducive to reducing the overall size of the optical lens.

[0048] In one possible design, the optical lens satisfies the following relationship:

[0049] OAL 3-n / TTL<0.6.

[0050] Among them, OAL 3-n It is the distance on the optical axis from the object side of the first lens to the image side of the last lens in the lens group.

[0051] The above relationship limits the axial spatial length of the lens group, reasonably allocates the spatial position of the lens group, and can better balance the imaging quality and processing and manufacturing processability.

[0052] In one possible design, the optical lens satisfies the following relationship:

[0053] f / EPD<2.5.

[0054] The above relationship limits the relationship between focal length and entrance pupil diameter. This increases the optical system's maximum light throughput while maintaining the lens's telephoto properties, improving imaging performance and enabling clear images even in dark environments.

[0055] In one possible design, the optical lens satisfies the following relationship:

[0056] DC2 / EPD<0.35.

[0057] Wherein, DC2 is the diameter of the convex reflective surface.

[0058] The above relationship limits the diameter of the convex reflective surface, which is essentially to limit the diameter of the opaque area, which is beneficial to reduce the obstruction of the opaque area to the incoming light, increase the effective light transmittance, and improve the imaging quality.

[0059] In one possible design, the optical lens satisfies the following relationship:

[0060] (ct3+ct4) / ct 3-4 >2.

[0061] Wherein, ct3 is the thickness of the first lens in the lens group on the optical axis, ct4 is the thickness of the second lens in the lens group on the optical axis, and ct 3-4 It is the distance on the optical axis between the first lens and the second lens in the lens group.

[0062] The above relationship reasonably arranges the positions of the first two lenses in the lens group, so that the optical lens has better manufacturability and is conducive to production and manufacturing.

[0063] In one possible design, the optical lens satisfies the following relationship:

[0064] f 1-2 / f<1.

[0065] Optionally, the number of lenses in the lens group is 3-5.

[0066] The lens group has enough parameter variables to optimize the design of lens layout and structure, so as to further shorten the total optical length of the optical lens while maintaining the same imaging quality.

[0067] Optionally, each lens in the lens group is made of plastic material.

[0068] Optionally, each lens in the lens group may be made of a mixed design of glass and plastic materials.

[0069] In one possible design, the first lens in the lens group has positive focal power or negative focal power; the object side surface of the first lens in the lens group is convex near the optical axis, and the image side surface is concave near the optical axis; the object side surface of the first lens in the lens group is convex near the periphery, and the image side surface is concave near the periphery.

[0070] Properly adjusting the focal length of the first lens in the lens group and the surface shapes on the object side and image side can help increase the field of view of the optical lens.

[0071] In one possible design, the secondary lens in the lens group has positive optical power or negative optical power; the object side surface of the secondary lens in the lens group is convex near the optical axis, and the image side surface is concave near the optical axis; the object side surface of the secondary lens in the lens group is concave near the periphery, and the image side surface is convex near the periphery.

[0072] The secondary lens in the lens group can eliminate the aberration and distortion of the optical lens.

[0073] Optionally, the focal length f of the optical lens is 15 mm to 15.37 mm, and the total optical length TTL of the optical lens is 5.9 mm to 6.58 mm. Limiting the focal length and total optical length of the optical lens facilitates proportional scaling when the optical system architecture is the same.

[0074] In a second aspect, an embodiment of the present application provides a lens module, comprising an electronic photosensitive element and the above-mentioned optical lens, wherein the optical lens is used to image light onto the electronic photosensitive element.

[0075] Since the lens module adopts the above-mentioned optical lens, the lens module also has the advantages of long focal length, short optical total length, miniaturization, etc. corresponding to the optical lens.

[0076] In a third aspect, an embodiment of the present application provides an electronic device, comprising a processor and the above-mentioned lens module, wherein the lens module is used to acquire image data and input the image data into the processor, and the processor is used to process the image data.

[0077] Optionally, the electronic device also includes a shell and a display screen. The display screen is installed on the shell. A accommodating space is formed in the shell. The lens module can be installed in the accommodating space. The display screen is electrically connected to the processor. The display screen can display pictures or videos that have been processed by the processor.

[0078] Since the lens module has the advantage of miniaturization, the size requirement for the accommodating space becomes lower. Therefore, the electronic device can be made lighter and thinner by reducing the thickness of the shell; or, without changing the thickness of the shell, the accommodating space saved by the lens module can be made available for other functional components.

[0079] Optionally, the housing may further include other components, such as a battery, a flash, a fingerprint recognition module, an earpiece, a circuit board, a sensor, etc., but is not limited thereto.

[0080] Optionally, the electronic device may be a terminal device with a video or photo recording function, such as a mobile phone, a tablet computer, a laptop computer, a video camera, a video recorder, a camera, an intelligent robot, or other devices with a video or photo recording function. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] Figure 1 is a schematic diagram of a first optical element provided in an embodiment of the present application;

[0082] Figure 2 is a schematic diagram of a second optical element provided in an embodiment of the present application;

[0083] Figure 3 Schematic diagram of an example of an optical lens provided in an embodiment of the present application;

[0084] Figure 4 yes Figure 3 A schematic diagram of the longitudinal spherical aberration of the optical lens in the embodiment;

[0085] Figure 5 yes Figure 3 Schematic diagram of astigmatism and field curvature of an optical lens in an embodiment;

[0086] Figure 6 yes Figure 3 A schematic diagram of optical distortion of an optical lens in an embodiment;

[0087] Figure 7 is a schematic diagram of another example of an optical lens provided in an embodiment of the present application;

[0088] Figure 8 yes Figure 7 A schematic diagram of the longitudinal spherical aberration of the optical lens in the embodiment;

[0089] Figure 9 yes Figure 7 Schematic diagram of astigmatism and field curvature of an optical lens in an embodiment;

[0090] Figure 10 yes Figure 7 A schematic diagram of optical distortion of an optical lens in an embodiment;

[0091] Figure 11 is a schematic diagram of another example of an optical lens provided in an embodiment of the present application;

[0092] Figure 12 yes Figure 11 A schematic diagram of the longitudinal spherical aberration of the optical lens in the embodiment;

[0093] Figure 13 yes Figure 11 Schematic diagram of astigmatism and field curvature of an optical lens in an embodiment;

[0094] Figure 14 yes Figure 11 A schematic diagram of optical distortion of an optical lens in an embodiment;

[0095] Figure 15 is a schematic diagram of another example of an optical lens provided in an embodiment of the present application;

[0096] Figure 16 yes Figure 15 A schematic diagram of the longitudinal spherical aberration of the optical lens in the embodiment;

[0097] Figure 17 yes Figure 15Schematic diagram of astigmatism and field curvature of an optical lens in an embodiment;

[0098] Figure 18 yes Figure 15 A schematic diagram of optical distortion of an optical lens in an embodiment;

[0099] Figure 19 is a schematic diagram of another example of an optical lens provided in an embodiment of the present application;

[0100] Figure 20 yes Figure 19 A schematic diagram of the longitudinal spherical aberration of the optical lens in the embodiment;

[0101] Figure 21 yes Figure 19 Schematic diagram of astigmatism and field curvature of an optical lens in an embodiment;

[0102] Figure 22 yes Figure 19 A schematic diagram of optical distortion of an optical lens in an embodiment;

[0103] Figure 23 is a schematic diagram of another example of an optical lens provided in an embodiment of the present application;

[0104] Figure 24 yes Figure 23 A schematic diagram of the longitudinal spherical aberration of the optical lens in the embodiment;

[0105] Figure 25 yes Figure 23 Schematic diagram of astigmatism and field curvature of an optical lens in an embodiment;

[0106] Figure 26 yes Figure 23 A schematic diagram of optical distortion of an optical lens in an embodiment;

[0107] Figure 27 is a schematic diagram of another example of an optical lens provided in an embodiment of the present application;

[0108] Figure 28 yes Figure 27 A schematic diagram of the longitudinal spherical aberration of the optical lens in the embodiment;

[0109] Figure 29 yes Figure 27 Schematic diagram of astigmatism and field curvature of an optical lens in an embodiment;

[0110] Figure 30 yes Figure 27 A schematic diagram of optical distortion of an optical lens in an embodiment;

[0111] Figure 31 Schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0112] The following is an illustrative introduction to the relevant contents that may be involved in the embodiments of this application.

[0113] For ease of understanding, the technical terms involved in this application are explained and described below.

[0114] Focal length, also known as focal length, is a measure of the convergence or divergence of light in an optical system. It refers to the vertical distance from the optical center of a lens or lens group to the focal plane, when an infinitely distant object is formed into a sharp image on the focal plane. From a practical perspective, it can be understood as the distance from the lens center to the film plane. For fixed-focus lenses, the position of the optical center is fixed; for zoom lenses, changes in the optical center result in changes in the lens' focal length.

[0115] The aperture is a device used to control the amount of light that passes through the lens and reaches the camera's photosensitive surface. It is usually located within the lens. The aperture size is expressed as a value of F / .

[0116] The aperture (F-number) is a relative value calculated by dividing the focal length of a lens by the diameter of the lens through which light passes (the inverse of the relative aperture). The smaller the F-number, the more light enters the image per unit time. A larger F-number reduces the depth of field, blurring the background in the image, similar to the effect of a telephoto lens.

[0117] Focal power: It is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam. It characterizes the ability of the optical system to deflect light. Refractive spherical power Where n' is the image-side refractive index, n is the object-side refractive index, r is the spherical radius, f' is the image focal length, and f is the object focal length. Optical power is generally expressed as the reciprocal of the image-side focal length (assuming the refractive index of air is approximately 1). The above optical power equation is universal for any optical system (regardless of paraxiality).

[0118] Optical power characterizes the refractive power of an optical system for an incident parallel light beam. The larger the value of , the more the parallel light beam is refracted; When , the inflection is convergent; , the inflection is divergent. When , it corresponds to plane refraction. In this case, the parallel beam along the axis remains parallel after refraction, and no refraction occurs.

[0119] Total track length (TTL) refers to the total length from the lens barrel to the imaging surface and is the main factor in determining the height of the camera.

[0120] The Abbe number, also known as the dispersion coefficient, is the difference ratio of the refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0121] In optical instruments, the field of view (FOV) is the angle between the two edges of the maximum range through which the image of the measured object can pass, with the lens as the vertex. The field of view determines the visual range of the optical instrument. A larger field of view means a wider field of view and a smaller optical magnification.

[0122] The optical axis is a ray of light that passes perpendicularly through the center of an ideal lens. When light rays parallel to the optical axis enter a convex lens, all the rays converge at a single point behind the lens. This point is called the focal point.

[0123] Object side and image side: With the lens as the boundary, the side where the subject is located is the object side, and the surface of the lens close to the object side can be called the object side; with the lens as the boundary, the side where the image of the subject is located is the image side, and the surface of the lens close to the image side can be called the image side.

[0124] Aperture refers to the edge, frame or specially designed barrier with holes in an optical component used to limit the size of the imaging beam or the imaging spatial unit.

[0125] The aperture stop is the stop that limits the maximum inclination angle of the marginal light in the imaging beam of the on-axis point, that is, the stop with the smallest incident aperture angle.

[0126] The entrance pupil is the common entrance for light beams emitted from all points on the object surface.

[0127] The entrance pupil diameter is the effective aperture that limits the incident light beam.

[0128] Aberration refers to the discrepancy between the results obtained by non-paraxial ray tracing and paraxial ray tracing in an actual optical system, and the deviation from the ideal state of Gaussian optics (first approximation theory or paraxial rays). Aberrations are mainly categorized as spherical aberration, coma, field curvature, astigmatism, distortion, chromatic aberration, and wavefront aberration.

[0129] Chromatic aberration refers to changing the color of light.

[0130] Longitudinal spherical aberration refers to the situation where when parallel light rays pass through the edge of the lens (far-axis light rays), their focal position is closer to the lens; while when light rays pass through the center of the lens (paraxial light rays), their focal position is farther away from the lens. This amount of focal misalignment along the optical axis is called longitudinal spherical aberration.

[0131] Distortion, also known as distortion, refers to the degree to which the image formed by an optical system is distorted relative to the object itself. Distortion is caused by spherical aberration. The height at which the chief rays of light from different fields of view intersect the Gaussian image plane after passing through the optical system is not equal to the ideal image height. The difference between the two is the distortion. Therefore, distortion only changes the image position of off-axis object points on the ideal plane, distorting the image shape but not affecting image clarity.

[0132] Optical distortion refers to the degree of deformation calculated based on optical theory.

[0133] Long focal length lenses, also known as telephoto lenses or telephoto lenses, are essential for photographing distant objects. They can accurately capture details and capture even difficult-to-access subjects. Especially when photographing wildlife, a suitable long focal length lens offers photographers numerous creative opportunities. However, due to their long focal length, long focal length lenses require a large axial space for adjusting the optical path. This results in an excessively long overall optical length, making it difficult to miniaturize the lens, which in turn fails to meet the trend toward thinner and lighter mobile devices.

[0134] How to further shorten the overall optical length of a camera lens while maintaining a long focal length to achieve miniaturization has become a challenge currently faced by camera lens manufacturers. Therefore, it is necessary to design an optical lens that can maintain a long focal length while meeting the requirement for a short overall optical length.

[0135] For the convenience of description, the left side of the optical lens is defined as the scene side (hereinafter also referred to as the object side), the surface of the lens facing the object side can be called the object side surface, and the object side surface can also be understood as the surface of the lens close to the object side. The right side of the optical lens is defined as the image side (hereinafter also referred to as the image side), the surface of the lens facing the image side can be called the image side surface, and the image side surface can also be understood as the surface of the lens close to the image side.

[0136] Figure 3 Schematic diagram of an example of an optical lens provided in an embodiment of the present application. Figure 1 yes Figure 3 The left view shows the first optical element 10 provided in an embodiment of the present application. Figure 2 yes Figure 3 The left view after hiding the first optical element 10 shows the second optical element 20 provided in the embodiment of the present application.

[0137] like Figure 1-Figure 3 As shown, the optical lens of the embodiment of the present application includes a first optical element 10 , a lens group 30 and a second optical element 20 .

[0138] The first optical element 10 includes a light-proof area 12 in the middle and a light-transmitting area 11 at the periphery. The light-transmitting area 11 is used for allowing light to pass through. A convex reflective surface 121 is provided on the image side of the light-proof area 12 .

[0139] The lens group 30 includes a plurality of lenses arranged sequentially from the object side to the image side.

[0140] The second optical element 20 is annularly mounted on the periphery of the lens assembly 30 . The second optical element 20 has a concave reflective surface 21 .

[0141] The concave reflective surface 21 is used to converge the light and reflect it to the convex reflective surface 121 . The convex reflective surface 121 is used to diverge the light and reflect it to the lens group 30 . The lens group 30 is used to image the light on a focal plane.

[0142] It should be noted that the central portion refers to the area on the first optical element 10 close to the optical axis, and the periphery refers to the area on the first optical element 10 far from the optical axis. The peripheral area is annular and surrounds the outside of the central area.

[0143] The concave reflective surface 21 has the ability to converge light, and the convex reflective surface 121 has the ability to diverge light.

[0144] Combine Figure 3 The optical lens shown depicts the geometric path of light: light originates from the object side of the optical lens, enters the interior of the optical lens through the light-transmitting area 11 of the first optical element 10, and is transmitted to the concave reflective surface 21 of the second optical element 20. The concave reflective surface 21 converges the light and reflects it to the convex reflective surface 121 of the first optical element 10. The convex reflective surface 121 diverges the light and then reflects it to the lens group 30. The multiple lenses of the lens group 30 refract the light multiple times before forming an image on the focal plane.

[0145] In an optical lens composed of pure lenses, there is no concave reflective surface 21 and convex reflective surface 121. The light travels along the direction from the object side to the image side of the lens group 30, requiring a large axial space to meet the adjustment requirements of the system optical path, which is not conducive to the design of a compact lens. In the embodiment of the present application, a folding optical lens is formed by the convex reflective surface 121, the concave reflective surface 21 and a plurality of lens elements. The convex reflective surface 121 and the concave reflective surface 21 can fold the system optical path, thereby significantly shortening the axial space, allowing the system optical path to complete imaging within a smaller light incident space, thereby making the entire lens structure more compact, further reducing the volume and weight, shortening the total optical length of the optical lens, and miniaturizing the lens shape to meet the requirements of lightweight and thin mobile electronic devices.

[0146] At the same time, the lens group 30 composed of multiple lenses not only meets the lens performance and image quality requirements such as lens focal length, spherical aberration, coma, astigmatism, field curvature, etc., but also has enough parameter variables (such as the order of lenses arranged along the optical path, lens material, refractive index, curvature radius, etc.) to optimize the lens layout and structure design, so as to further shorten the total optical length of the optical lens while maintaining the same imaging quality.

[0147] Furthermore, the optical lens of this embodiment offers the advantages of low design difficulty and manufacturing cost. This is because different light colors are composed of different spectra, each with its own specific wavelength. Consequently, not all colors of light produce the same refraction. Therefore, an optical lens composed solely of lenses cannot focus all colors of light completely, but rather scatters them elsewhere, resulting in chromatic aberration. This chromatic aberration requires controlling parameters such as the lens's surface shape and thickness to eliminate it. In contrast, the optical lens of this embodiment reflects light upon entry, thus avoiding chromatic aberration caused by refraction. Although subsequent light will also enter the lens assembly 30 and be refracted, chromatic aberration correction is relatively easy, thereby reducing the design difficulty and manufacturing cost of the lens assembly 30.

[0148] In addition, in addition to having a convex reflective surface 121, the first optical element 10 also has a light-transmitting area 11 that can refract incident light. Therefore, the surface shape, radius of curvature, thickness, and other parameters of the light-transmitting area 11 and the convex reflective surface 121 can be adjusted to achieve structural optimization and aberration adjustment of the entire optical lens. Compared to the variable parameters that can be achieved by arranging two lenses (lens and reflector), this embodiment only requires one first optical element 10 to have the same number of variable parameters for optimizing and adjusting the optical lens. Therefore, the use of the first optical element 10 in the embodiment of the present application can reduce the number of lens designs and production costs, thereby making the entire optical lens structure more compact and further reducing the volume and weight of the system.

[0149] Optionally, the first optical element 10 and the convex reflective surface 121 can be an integrated structure or a split structure, that is, the base on which the convex reflective surface 121 is located and the first optical element 10 are two parts, and the two parts are connected to fix the convex reflective surface 121 on the image side of the opaque area 12 of the first optical element 10.

[0150] Optionally, the object-side surface and the image-side surface of the light-transmitting region 11 of the first optical element 10 may both be planes.

[0151] Optionally, the object side surface and the image side surface of the light-transmitting area 11 of the first optical element 10 are both aspherical surfaces with a certain optical focal length. The optical focal length of the two surfaces is reasonably distributed, so that the light-transmitting area 11 has a negative optical focal length, so that after entering, the light is not contracted and focused, but is bent outward, thereby correcting the spherical aberration of the concave reflecting surface 21.

[0152] Optionally, the convex reflective surface 121 of the first optical element 10 and the concave reflective surface 21 of the second optical element 20 are both spherical surfaces, which have the advantages of simple design and low manufacturing cost.

[0153] Optionally, the convex reflective surface 121 of the first optical element 10 and the concave reflective surface 21 of the second optical element 20 are both aspherical surfaces, which can eliminate the spherical aberration that is easily produced by spherical mirrors, help reduce the inter-surface reflection ghosts of the optical lens, improve the transmittance of the lens, and thus improve the imaging quality of the lens.

[0154] Optionally, the first optical element 10, the lens group 30 and the second optical element 20 are assembled through a lens barrel. The first optical element 10 also has the function of sealing the lens barrel to prevent dust from entering the lens barrel and contaminating the lens. At the same time, the first optical element 10 also has the function of supporting the convex reflective surface 121.

[0155] Optionally, the lens group 30 includes 3-5 lenses.

[0156] To facilitate the description of each lens in the lens group 30, the following definitions are made:

[0157] When the lens group 30 is composed of three lenses, the three lenses are respectively defined as a third lens 31, a fourth lens 32, and a fifth lens 33;

[0158] When the lens group 30 is composed of four lenses, the four lenses are respectively defined as a third lens 31, a fourth lens 32, a fifth lens 33, and a sixth lens 34;

[0159] When the lens group 30 is composed of five lenses, the five lenses are respectively defined as a third lens 31 , a fourth lens 32 , a fifth lens 33 , a sixth lens 34 , and a seventh lens 35 .

[0160] Optionally, the optical lens further includes an aperture stop 40, which may be provided on the third lens element 31. The effective light opening of the aperture stop 40 may be circular, with the surface of the effective light opening perpendicular to the optical axis, and the center of the effective light opening located on the optical axis. The aperture stop 40 may be made of any material, such as plastic, aluminum alloy, beryllium aluminum alloy, titanium alloy, aluminum, or beryllium.

[0161] Aperture stop 40 ensures near-axis conditions, improves image quality, enhances image clarity, controls the spatial extent of the imaged object, and controls the brightness of the image plane. In this application, by adjusting the size of aperture stop 40, a larger entrance pupil diameter can be achieved. For a given lens focal length, a smaller aperture F-number can be achieved, i.e., a larger aperture and diffraction-limited value can be achieved, thereby improving the imaging quality of the optical lens.

[0162] Optionally, the optical lens further includes an infrared cutoff filter 50, which is arranged on the image side of the last lens in the lens group 30. For example, when there are four lenses, the infrared cutoff filter 50 is arranged on the image side of the fifth lens 33; when there are five lenses, the infrared cutoff filter 50 is arranged on the image side of the seventh lens 35.

[0163] The infrared cut-off filter 50 can effectively block infrared light that interferes with imaging quality and maintain high transmittance of visible light, so that the resulting image can better meet the optimal perception of the human eye.

[0164] For ease of understanding and description, the present invention defines the representation of the relevant parameters of the optical lens. For example, f is used to represent the focal length of the optical lens, and f is used to represent the focal length of the optical lens. 1-2 Indicates the combined focal length of the first optical element 10 and the second optical element 20, etc., and similarly defined letters are only schematic and can of course be expressed in other forms, and this application does not impose any limitation.

[0165] It should also be noted that the units of the parameters involved in the ratio in the following relationship formula remain consistent. For example, the unit of the numerator is millimeter (mm), and the unit of the denominator is also millimeter.

[0166] In addition, the optical lens satisfies the following relationship:

[0167] 0>f 1-2 / f 3-n >-3.5;

[0168] Among them, f 1-2 is the combined focal length of the first optical element 10 and the second optical element 20, f 3-n is the combined focal length of the lens group 30.

[0169] It should be understood that the above-mentioned “optical lens” refers to the first optical element 10, the second optical element 20 and the lens group 30. 3-n Refers to the combined focal length of the first lens to the last lens, such as: when the lens group 30 consists of 5 lenses, f 3-n It refers to the combined focal length of the third to seventh lenses 31 to 35 .

[0170] The above relationship specifies the ratio of the combined focal length of the first optical element 10 and the second optical element 20 to the combined focal length of the lens group 30 in the range 0>f 1-2 / f 3-n >-3.5, which can limit the axial space length between the first optical element 10 and the second optical element 20 and the axial space length of the lens group 30, which is beneficial for the optical lens in the present application to have good telephoto characteristics, shorten the total optical length of the lens to achieve module miniaturization, and at the same time have good imaging quality.

[0171] Optionally, in the optical lens in the embodiment of the present application, the first optical element 10 may be made of plastic or glass.

[0172] Optionally, the first optical element 10 may also be other materials that can meet the refractive index requirements, such as a composite material obtained by mixing fine particles of inorganic metal oxides, inorganic metal sulfides, etc. into a resin matrix.

[0173] Optionally, the convex reflective surface 121 of the first optical element 10 may be a metal reflective film layer prepared by evaporation or sputtering, and the metal may be nickel, aluminum, silver, gold, or alloys thereof.

[0174] Optionally, the second optical element 20 may be made of plastic or glass, or other materials that can meet the performance requirements of the second optical element 20, such as a composite material in which fine particles of inorganic metal oxides, inorganic metal sulfides, etc. are mixed into a resin matrix.

[0175] Optionally, the concave reflective surface 21 of the second optical element 20 may be a metal reflective film layer prepared by evaporation or sputtering, and the metal may be nickel, aluminum, silver, gold, or alloys thereof.

[0176] Optionally, the optical lens satisfies the following relationship:

[0177] TTL / f<0.5.

[0178] Wherein, TTL is the total optical length of the optical lens, and f is the focal length of the optical lens.

[0179] The above relationship specifies the ratio range of the focal length of the optical lens to the total optical length, TTL / f<0.5. While satisfying the telephoto characteristic, it can limit the total optical length of the optical lens to achieve module miniaturization, and is also conducive to proportional scaling when the optical lens architecture is the same.

[0180] Optionally, the optical lens satisfies the following relationship:

[0181] 1≤WD3 / EPD≤1.1.

[0182] Wherein, WD3 is the diameter of the image formed on the object side by the first lens in the lens group 30 through the first optical element 10 and the second optical element 20, and EPD is the entrance pupil diameter of the optical lens.

[0183] That is, WD3 is the diameter of the image formed on the object side by the third lens 31 through the first optical element 10 and the second optical element 20 .

[0184] The above relationship specifies that the ratio of the diameter of the image formed on the object side by the third lens 31 through the first optical element 10 and the second optical element 20 to the entrance pupil diameter is in the range of 1≤WD3 / EPD≤1.1. This is conducive to reasonable adjustment of the optical path, and can effectively limit the light path outside the field of view or the non-imaging light path from reaching the effective image plane, thereby avoiding damage to the imaging performance and ensuring that the imaging system has good imaging quality.

[0185] Optionally, the optical lens satisfies the following relationship:

[0186] Imgh / TTL>0.1.

[0187] Among them, Imgh is half of the diagonal length of the 60-pixel area of ​​the electronic photosensitive element on the focusing plane, and TTL is the total optical length of the optical lens.

[0188] The above relationship stipulates that the ratio range of half the diagonal length of the 60-pixel area of ​​the electronic photosensitive element on the focusing plane to the total optical length is Imgh / TTL>0.1. While ensuring that the optical lens has a high-pixel image, limiting the total optical length of the optical lens is conducive to better reducing the overall size and achieving miniaturization.

[0189] Optionally, the optical lens satisfies the following relationship:

[0190] Imgh / D1>0.3.

[0191] Wherein, Imgh is half of the diagonal length of the 60-pixel area of ​​the electronic photosensitive element on the focusing plane, and D1 is the radius of the outer circumference of the first optical element 10.

[0192] The above relationship stipulates that the ratio range of half the diagonal length of the 60-pixel area of ​​the electronic photosensitive element on the focusing plane to the radius of the outer circumference of the first optical element 10 is Imgh / D1>0.3. While ensuring that the optical lens has a high-pixel image, the radial space of the optical lens is limited, which is conducive to reducing the overall size of the optical lens.

[0193] Optionally, the optical lens satisfies the following relationship:

[0194] OAL 3-n / TTL<0.6.

[0195] Among them, OAL 3-nIt is the distance on the optical axis from the object side surface of the first lens to the image side surface of the last lens in the lens group 30, and TTL is the total optical length of the optical lens.

[0196] In other words, OAL 3-n The distance between the object side of the third lens 31 and the image side of the last lens on the optical axis. For example, when the lens group 30 consists of 5 lenses, OAL 3-n It refers to the distance on the optical axis from the object-side surface of the third lens element 31 to the image-side surface of the seventh lens element 35 .

[0197] The above relationship specifies the ratio range OAL of the distance on the optical axis from the object side of the third lens 31 to the image side of the last lens to the total optical length. 3-n / TTL<0.6 limits the axial spatial length of the lens group 30, reasonably allocates the spatial positions of the third transparent lens to the last lens, and can better balance the imaging quality and processing and manufacturing processability.

[0198] Optionally, the optical lens satisfies the following relationship:

[0199] f / EPD<2.5.

[0200] Where f is the focal length of the optical lens, and EPD is the entrance pupil diameter of the optical lens.

[0201] The above equation specifies a range of f / EPD < 2.5 for the ratio of focal length to entrance pupil diameter for an optical lens. This restricts the relationship between focal length and entrance pupil diameter, increasing the optical system's maximum light throughput and improving imaging performance while maintaining the lens's telephoto properties. This allows for clear images even in dark environments.

[0202] Optionally, the optical lens satisfies the following relationship:

[0203] DC2 / EPD<0.35.

[0204] Wherein, DC2 is the diameter of the convex reflective surface 121, and EPD is the entrance pupil diameter of the optical lens.

[0205] The above relationship stipulates that the ratio range of the diameter of the convex reflecting surface 121 to the entrance pupil diameter is DC2 / EPD<0.35, which limits the diameter of the convex reflecting surface 121. In essence, it is to limit the diameter of the opaque area 12, which is beneficial to reduce the obstruction of the opaque area 12 to the incoming light, increase the effective light transmittance, and improve the imaging quality.

[0206] Optionally, the optical lens satisfies the following relationship:

[0207] (ct3+ct4) / ct 3-4 >2.

[0208] Wherein, ct3 is the thickness of the first lens in the lens group 30 on the optical axis, ct4 is the thickness of the second lens in the lens group 30 on the optical axis, and ct 3-4 is the distance on the optical axis between the first lens and the second lens in the lens group 30.

[0209] That is, ct3 is the thickness of the third lens 31 on the optical axis, ct4 is the thickness of the fourth lens 32 on the optical axis, and ct 3-4 is the distance on the optical axis between the third lens 31 and the fourth lens 32.

[0210] The above relationship specifies the ratio range of the sum of the thickness on the optical axis of the third lens 31 and the thickness on the optical axis of the fourth lens 32 to the gap on the optical axis between the third lens 31 and the fourth lens 32 (ct3+ct4) / ct 3-4 >2. The positions of the first two lenses in the lens group 30 are reasonably arranged so that the optical lens has better manufacturability and is conducive to production and manufacturing.

[0211] Optionally, the third lens 31 may be made of plastic or glass, or other materials that meet the performance requirements of the third lens 31, such as a composite material comprising fine particles of an inorganic metal oxide or inorganic metal sulfide mixed into a resin matrix. The third lens 31 may have positive or negative optical power. The object-side surface of the third lens 31 is convex near the optical axis, while the image-side surface of the third lens 31 is concave near the optical axis. The object-side surface of the third lens 31 is convex near the periphery, while the image-side surface of the third lens 31 is concave near the periphery.

[0212] Properly adjusting the optical power of the third lens 31 and the object-side and image-side surface shapes can help increase the field of view of the optical lens.

[0213] Optionally, the fourth lens 32 may be made of plastic or glass, or other materials that meet the performance requirements of the fourth lens 32, such as a composite material comprising fine particles of an inorganic metal oxide or inorganic metal sulfide mixed into a resin matrix. The fourth lens 32 may have positive or negative optical power. The object-side surface of the fourth lens 32 is convex near the optical axis, and the image-side surface of the fourth lens 32 is concave near the optical axis. The object-side surface of the fourth lens 32 is concave near the periphery, and the image-side surface of the fourth lens 32 is convex near the periphery.

[0214] Optionally, the fifth lens element 33 may be made of plastic or glass, or other materials that meet the performance requirements of the fifth lens element 33, such as a composite material comprising fine particles of an inorganic metal oxide or inorganic metal sulfide mixed into a resin matrix. The fifth lens element 33 may have positive or negative optical power. The object-side surface of the fifth lens element 33 may be convex or concave near the optical axis, and the image-side surface of the fifth lens element 33 may be concave near the optical axis. The object-side surface of the fifth lens element 33 may be concave near the periphery, and the image-side surface of the fifth lens element 33 may be convex near the periphery.

[0215] Optionally, the sixth lens element 34 may be made of plastic or glass, or other materials that meet the performance requirements of the sixth lens element 34, such as a composite material comprising fine particles of an inorganic metal oxide or inorganic metal sulfide mixed into a resin matrix. The sixth lens element 34 has negative optical power. The object-side surface of the sixth lens element 34 is concave near the optical axis, and the image-side surface of the sixth lens element 34 may be either convex or concave near the optical axis. The object-side surface of the sixth lens element 34 is concave near the periphery, and the image-side surface of the sixth lens element 34 is convex near the periphery.

[0216] Optionally, the seventh lens element 35 may be made of plastic or glass, or other materials that meet the performance requirements of the seventh lens element 35, such as a composite material comprising fine particles of an inorganic metal oxide or inorganic metal sulfide mixed into a resin matrix. The seventh lens element 35 has negative optical power. The object-side surface of the seventh lens element 35 is concave near the optical axis, while the image-side surface of the seventh lens element 35 is convex near the optical axis. The object-side surface of the seventh lens element 35 is concave near the periphery, while the image-side surface of the seventh lens element 35 is convex near the periphery.

[0217] Optionally, the third lens 31, fourth lens 32, fifth lens 33, sixth lens 34, and seventh lens 35 in lens assembly 30 are all made of plastic. This reduces the weight of lens assembly 30 and, in turn, reduces the difficulty of designing and manufacturing the actuators in the lens module. Furthermore, due to the process characteristics of injection molding, plastic materials can achieve high-precision spherical, aspherical, and free-form surface shapes, meeting the surface shape requirements of each lens in lens assembly 30 as described herein.

[0218] Optionally, the third lens 31, the fourth lens 32, the fifth lens 33, the sixth lens 34 and the seventh lens 35 in the lens group 30 can adopt a hybrid design of glass and plastic materials, taking advantage of the fact that glass has more refractive index and Abbe coefficient options to achieve the design of a large aperture or ultra-large aperture camera optical lens and optical system design. In addition, the optical lens with a hybrid design of glass and plastic materials can also provide more architectural possibilities for optical design, making it easier to obtain a miniaturized optical lens with strong phase difference correction capability.

[0219] Optionally, in an embodiment of the present application, the focal length f of the optical lens is greater than or equal to 15 mm and less than or equal to 15.37 mm.

[0220] Optionally, in the embodiment of the present application, the total optical length TTL of the optical lens is greater than or equal to 5.9 mm and less than or equal to 6.58 mm. Limiting the focal length and total optical length of the optical lens facilitates proportional scaling when the optical system architecture is the same.

[0221] The following will be combined Figures 3 to 30 Some specific but non-limiting examples of the embodiments of the present application are described in more detail.

[0222] Example 1

[0223] like Figure 3 The optical lens of one embodiment of the present application includes: a first optical element 10, a second optical element 20 and a lens group 30. The lens group 30 is composed of five lenses, namely a third lens 31, a fourth lens 32, a fifth lens 33, a sixth lens 34 and a seventh lens 35.

[0224] According to the above relationship, the design parameters of the first embodiment of the present application are shown in Table 1 below.

[0225] Table 1 Design parameters of Example 1

[0226]

[0227]

[0228] Specifically, Tables 2 and 3 show the design parameters of the optical lens in Example 1.

[0229] Table 2 shows the basic parameters of the optical lens in Example 1 of the present application, as shown in Table 2.

[0230] Table 2 Basic parameters of the optical lens of Example 1

[0231] focal length f 15.04mm Aperture F value 2.0 Field of view FOV 19.7° Optical total length TTL 6.58mm Design wavelength 656nm, 587nm, 546nm, 486nm, 435nm

[0232] Table 3 Aspheric coefficients of the optical lens of Example 1

[0233]

[0234]

[0235] Where k is the cone coefficient, and A4, A6, A8, A10, A12, A14, A16, and A20 are aspheric coefficients.

[0236] In the first embodiment of the present application, the aspheric surface equation of each surface can be:

[0237]

[0238] Where z is the relative distance between a point r from the optical axis on the aspheric surface and the tangent plane that intersects the optical axis of the aspheric surface; r is the perpendicular distance between the point on the aspheric curve and the optical axis; c is the curvature; k is the conic coefficient; and A4 to A20 are the aspheric coefficients.

[0239] It should be understood that the aspheric surface of each lens in the optical lens can use the aspheric surface shown in the above aspheric surface equation, or other aspheric surface formulas can be used, and this application does not limit this.

[0240] The design parameters of the optical lens of Example 1 of the present application are given above. The entrance pupil diameter of the optical lens is 7.5 mm, the maximum field angle is 19.7°, the aperture F value is 2.0, and the total optical length is 6.58 mm. Figure 4-Figure 6 The optical performance of the optical lens designed with the lens combination mode of embodiment 1 is described.

[0241] Figure 4 The longitudinal spherical aberration of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm after passing through the optical lens of Example 1 is shown. Figure 4 It can be seen that the offset of each wavelength of light at the focus is controlled within the range of -0.05mm to 0.01. The optical lens of Example 1 can focus most of the light at the correct focus point, thereby making the image clearer and sharper.

[0242] Figure 5 Schematic diagram showing astigmatism and field curvature of light with a reference wavelength of 587 nm after passing through the optical lens of Example 1. Figure 5 The solid line is the focus offset in the meridional direction, and the dashed line is the focus offset in the sagittal direction. Figure 5 As can be seen from the figure, the focus offset in both the meridian and sagittal directions is controlled within the range of 0 to 0.25 mm. The optical lens of Example 1 not only achieves high sharpness at the focus position, but also maintains sharpness from the focus to the edge without fluctuation or monotonous decrease.

[0243] Figure 6 A schematic diagram showing optical distortion of light with a reference wavelength of 587 nm after passing through the optical lens of Example 1 is shown. Figure 6 It can be seen that the distortion is controlled within 0-0.5%. The optical lens of Example 1 has low distortion and excellent imaging quality.

[0244] Example 2

[0245] like Figure 7 The optical lens of another embodiment of the present application includes: a first optical element 10, a second optical element 20 and a lens group 30. The lens group 30 is composed of three lenses, namely a third lens 31, a fourth lens 32 and a fifth lens 33.

[0246] According to the above relationship, the design parameters of the second embodiment of the present application are shown in Table 4 below.

[0247] Table 4 Design parameters of Example 2

[0248]

[0249]

[0250] Specifically, Tables 5 and 6 show the design parameters of the optical lens in Example 2.

[0251] Table 5 shows the basic parameters of the optical lens in Example 2 of the present application, as shown in Table 5.

[0252] Table 5 Basic parameters of the optical lens of Example 2

[0253] focal length f 15.08mm Aperture F value 2.0 Field of view FOV 15.76° Optical total length TTL 6.51mm Design wavelength 656nm, 587nm, 546nm, 486nm, 435nm

[0254] Table 6 Aspheric coefficients of the optical lens of Example 2

[0255]

[0256] Wherein, k is the cone coefficient, and A4, A6, A8, A10, A12, A14, A16, and A20 are aspheric coefficients. The aspheric surface of each lens in the optical lens of the second embodiment can use the aspheric surface equation shown in the first embodiment, or other aspheric surface formulas can be used, which is not limited in this application.

[0257] The design parameters of the optical lens of Example 2 of the present application are given above. The entrance pupil diameter of the optical lens is 7.51 mm, the maximum field of view angle is 15.76°, the aperture F value is 2.0, and the total optical length is 6.51 mm. Figures 8-10 The optical performance of the optical lens designed with the lens combination mode of the second embodiment is described.

[0258] Figure 8 The longitudinal spherical aberration of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm after passing through the optical lens of Example 2 is shown. Figure 8 It can be seen that the offset of each wavelength of light at the focus is controlled within the range of -0.06mm to 0.03mm. The optical lens of Example 2 can focus most of the light at the correct focus point, thereby making the image clearer and sharper.

[0259] Figure 9 Schematic diagram showing astigmatism and field curvature of light with a reference wavelength of 587 nm after passing through the optical lens of Example 2. Figure 9 The solid line is the focus offset in the meridional direction, and the dashed line is the focus offset in the sagittal direction. Figure 9 As can be seen, the focus offset in the meridional direction is controlled within the range of -0.03mm to 0, and the focus offset in the sagittal direction is controlled within the range of -0.02mm to 0.08mm. The optical lens of Example 2 not only achieves high sharpness at the focal position, but also maintains sharpness from the focal point to the edge without fluctuation or monotonous decrease.

[0260] Figure 10 A schematic diagram showing optical distortion of light with a reference wavelength of 587 nm after passing through the optical lens of Example 2 is shown. Figure 10 It can be seen that the distortion is controlled within 0.6%. The optical lens of Example 2 has low distortion and excellent imaging quality.

[0261] Example 3

[0262] like Figure 11 The optical lens of another embodiment of the present application includes: a first optical element 10, a second optical element 20 and a lens group 30. The lens group 30 is composed of three lenses, namely a third lens 31, a fourth lens 32 and a fifth lens 33.

[0263] Based on the above relationship, the design parameters of Example 3 of the present application are shown in Table 7 below.

[0264] Table 7 Design parameters of Example 3

[0265]

[0266]

[0267] Specifically, Tables 8 and 9 show the design parameters of the optical lens in Example 3.

[0268] Table 8 shows the basic parameters of the optical lens in Example 3 of the present application, as shown in Table 8.

[0269] Table 8 Basic parameters of the optical lens of Example 3

[0270] focal length f 15.09mm Aperture F value 2.0 Field of view FOV 19.6° Optical total length TTL 6.51mm Design wavelength 656nm, 587nm, 546nm, 486nm, 435nm

[0271] Table 9 Aspheric coefficients of the optical lens of Example 3

[0272]

[0273] Where k is the cone coefficient, and A4, A6, A8, A10, A12, A14, A16, and A20 are aspheric coefficients.

[0274] The aspheric surface of each lens in the optical lens in the third embodiment can use the aspheric surface shown in the aspheric surface equation in the first embodiment, or other aspheric surface formulas can be used, which is not limited in this application.

[0275] The design parameters of the optical lens of Example 3 of the present application are given above. The entrance pupil diameter of the optical lens is 7.55 mm, the maximum field of view angle is 19.6°, the aperture F value is 2.0, and the total optical length is 6.51 mm. Figure 12-14 The optical performance of the optical lens designed with the lens combination mode of embodiment 3 is described.

[0276] Figure 12 The longitudinal spherical aberration of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm after passing through the optical lens of Example 3 is shown. Figure 12 It can be seen that the offset of each wavelength of light at the focus is controlled within the range of -0.08mm to 0.04mm. The optical lens of Example 3 can focus most of the light at the correct focus point, thereby making the image clearer and sharper.

[0277] Figure 13 Schematic diagram showing astigmatism and field curvature of light with a reference wavelength of 587 nm after passing through the optical lens of Example 3. Figure 13 The solid line is the focus offset in the meridional direction, and the dashed line is the focus offset in the sagittal direction. Figure 13 As can be seen from the figure, the focus offset in the meridional direction is controlled within the range of -0.1mm to 0, and the focus offset in the sagittal direction is controlled within the range of -0.07mm to 0mm. The optical lens of Example 3 not only achieves high sharpness at the focus position, but also maintains sharpness from the focus to the edge without fluctuation or monotonous decrease.

[0278] Figure 14 A schematic diagram showing optical distortion of light with a reference wavelength of 587 nm after passing through the optical lens of Example 3 is shown. Figure 14 It can be seen that the distortion is controlled within 0.7%. The optical lens of Example 3 has low distortion and excellent imaging quality.

[0279] Example 4

[0280] like Figure 15 The optical lens of another embodiment of the present application includes: a first optical element 10, a second optical element 20 and a lens group 30. The lens group 30 is composed of four lenses, namely a third lens 31, a fourth lens 32, a fifth lens 33 and a sixth lens 34.

[0281] Based on the above relationship, the design parameters of the fourth embodiment of the present application are shown in Table 10 below.

[0282] Table 10 Design parameters of Example 4

[0283]

[0284] Specifically, Tables 11 and 12 show the design parameters of the optical lens in Example 4.

[0285] Table 11 shows the basic parameters of the optical lens in Example 4 of the present application, as shown in Table 11.

[0286] Table 11 Basic parameters of the optical lens of Example 4

[0287]

[0288]

[0289] Table 12 Aspheric coefficients of the optical lens of Example 4

[0290]

[0291] Where k is the cone coefficient, and A4, A6, A8, A10, A12, A14, A16, and A20 are aspheric coefficients.

[0292] The aspheric surface of each lens in the optical lens in the fourth embodiment can use the aspheric surface shown in the aspheric surface equation in the first embodiment, or other aspheric surface formulas can be used, which is not limited in this application.

[0293] The design parameters of the optical lens of Example 4 of the present application are given above. The entrance pupil diameter of the optical lens is 7.5 mm, the maximum field angle is 19.7°, the aperture F value is 2.0, and the total optical length is 6.50 mm. Figure 16-Figure 18 The optical performance of the optical lens designed with the lens combination mode of the fourth embodiment is described.

[0294] Figure 16 The longitudinal spherical aberration of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm after passing through the optical lens of Example 4 is shown. Figure 16It can be seen that the offset of each wavelength of light at the focus is controlled within the range of -0.05mm to 0.025mm. The optical lens of Example 4 can focus most of the light at the correct focus point, thereby making the image clearer and sharper.

[0295] Figure 17 Schematic diagram showing astigmatism and field curvature of light with a reference wavelength of 587 nm after passing through the optical lens of Example 4. Figure 17 The solid line is the focus offset in the meridional direction, and the dashed line is the focus offset in the sagittal direction. Figure 17 As can be seen from the figure, the focus offset in the meridional direction is controlled within the range of -0.02mm to 0.1mm, and the focus offset in the sagittal direction is controlled within the range of -0.02mm to 0.2mm. The optical lens of Example 4 not only achieves high sharpness at the focus position, but also maintains sharpness from the focus to the edge without fluctuation or monotonous decrease.

[0296] Figure 18 A schematic diagram of optical distortion of light with a reference wavelength of 587 nm after passing through the optical lens of Example 4 is shown. Figure 18 It can be seen that the distortion is controlled within 0.75%. The optical lens of Example 4 has low distortion and excellent imaging quality.

[0297] Example 5

[0298] like Figure 19 The optical lens of another embodiment of the present application includes: a first optical element 10, a second optical element 20 and a lens group 30. The lens group 30 is composed of five lenses, namely a third lens 31, a fourth lens 32, a fifth lens 33, and a sixth lens 34.

[0299] Based on the above relationship, the design parameters of the fifth embodiment of the present application are shown in Table 13 below.

[0300] Table 13 Design parameters of Example 5

[0301]

[0302] Specifically, Tables 14 and 15 show the design parameters of the optical lens in Example 5.

[0303] Table 14 shows the basic parameters of the optical lens in Example 5 of the present application, as shown in Table 14.

[0304] Table 14 Basic parameters of the optical lens of Example 5

[0305] focal length f 15.00mm Aperture F value 1.93 Field of view FOV 19.7° Optical total length TTL 6.50mm Design wavelength 656nm, 587nm, 546nm, 486nm, 435nm

[0306] Table 15 Aspheric coefficients of the optical lens of Example 5

[0307]

[0308]

[0309] Where k is the cone coefficient, and A4, A6, A8, A10, A12, A14, A16, and A20 are aspheric coefficients.

[0310] The aspheric surface of each lens in the optical lens in the fifth embodiment can use the aspheric surface shown in the aspheric surface equation in the first embodiment, or other aspheric surface formulas can be used, which is not limited in this application.

[0311] The design parameters of the optical lens of Example 5 of the present application are given above. The entrance pupil diameter of the optical lens is 7.75 mm, the maximum field angle is 19.7°, the aperture F value is 1.93, and the total optical length is 6.50 mm. Figure 20-22 The optical performance of the optical lens designed with the lens combination mode of embodiment 5 is described.

[0312] Figure 20 The longitudinal spherical aberration of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm after passing through the optical lens of Example 5 is shown. Figure 20 It can be seen that the offset of each wavelength of light at the focus is controlled within the range of -0.011mm to 0.011mm. The optical lens of Example 5 can focus most of the light at the correct focus point, thereby making the image clearer and sharper.

[0313] Figure 21 Schematic diagram showing astigmatism and field curvature of light with a reference wavelength of 587 nm after passing through the optical lens of Example 5. Figure 21 The solid line is the focus offset in the meridional direction, and the dashed line is the focus offset in the sagittal direction. Figure 21 As can be seen, the focus offset in the meridional direction is controlled within the range of -0.002mm to 0.012mm, and the focus offset in the sagittal direction is controlled within the range of -0.02mm to 0.01mm. The optical lens of Example 5 not only achieves high sharpness at the focal point, but also maintains sharpness from the focal point to the edge without fluctuation or monotonous decrease.

[0314] Figure 22 A schematic diagram showing optical distortion of light with a reference wavelength of 587 nm after passing through the optical lens of Example 5 is shown. Figure 22 It can be seen that the distortion is controlled within 0.7%. The optical lens of Example 5 has low distortion and excellent imaging quality.

[0315] Example 6

[0316] like Figure 23The optical lens of another embodiment of the present application includes: a first optical element 10, a second optical element 20 and a lens group 30. The lens group 30 is composed of four lenses, namely a third lens 31, a fourth lens 32, a fifth lens 33 and a sixth lens 34.

[0317] Based on the above relationship, the design parameters of Example 6 of the present application are shown in Table 16 below.

[0318] Table 16 Design parameters of embodiment 6

[0319]

[0320]

[0321] Specifically, Tables 17 and 18 show the design parameters of the optical lens in Example 6.

[0322] Table 17 shows the basic parameters of the optical lens in Example 6 of the present application, as shown in Table 17.

[0323] Table 17 Basic parameters of the optical lens of Example 6

[0324] focal length f 15.37mm Aperture F value 1.935 Field of view FOV 15.2° Optical total length TTL 6.05mm Design wavelength 656nm, 587nm, 546nm, 486nm, 435nm

[0325] Table 18 Aspheric coefficients of the optical lens of Example 6

[0326]

[0327]

[0328] Where k is the cone coefficient, and A4, A6, A8, A10, A12, A14, A16, and A20 are aspheric coefficients.

[0329] The aspheric surface of each lens in the optical lens in the sixth embodiment can use the aspheric surface shown in the aspheric surface equation in the first embodiment, or other aspheric surface formulas can be used, which is not limited in this application.

[0330] The design parameters of the optical lens of Example 6 of the present application are given above. The entrance pupil diameter of the optical lens is 7.95 mm, the maximum field angle is 15.2°, the aperture F value is 1.935, and the total optical length is 6.05 mm. Figure 24-26 The optical performance of the optical lens designed with the lens combination mode of Example 6 is described.

[0331] Figure 24 The longitudinal spherical aberration of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm after passing through the optical lens of Example 6 is shown. Figure 24It can be seen that the offset of each wavelength of light at the focus is controlled within the range of -0.025mm to 0.01mm. The optical lens of Example 6 can focus most of the light at the correct focus point, thereby making the image clearer and sharper.

[0332] Figure 25 Schematic diagram showing astigmatism and field curvature of light with a reference wavelength of 587 nm after passing through the optical lens of Example 6. Figure 25 The solid line is the focus offset in the meridional direction, and the dashed line is the focus offset in the sagittal direction. Figure 25 As can be seen from the figure, the focus offset in the meridional direction is controlled within the range of -0.015mm to 0, and the focus offset in the sagittal direction is controlled within the range of -0.01mm to 0.02mm. The optical lens of Example 6 not only achieves high sharpness at the focal position, but also maintains sharpness from the focal point to the edge without fluctuation or monotonous decrease.

[0333] Figure 26 A schematic diagram showing optical distortion of light with a reference wavelength of 587 nm after passing through the optical lens of Example 6 is shown. Figure 26 It can be seen that the distortion is controlled within 0.7%. The optical lens of Example 6 has low distortion and excellent imaging quality.

[0334] Example 7

[0335] like Figure 27 The optical lens of another embodiment of the present application includes: a first optical element 10, a second optical element 20 and a lens group 30. The lens group 30 is composed of four lenses, namely a third lens 31, a fourth lens 32, a fifth lens 33 and a sixth lens 34.

[0336] Based on the above relationship, the design parameters of Example 7 of the present application are shown in Table 19 below.

[0337] Table 19 Design parameters of embodiment 7

[0338]

[0339]

[0340] Specifically, Tables 20 and 21 show the design parameters of the optical lens in Example 7.

[0341] Table 20 shows the basic parameters of the optical lens in Example 7 of the present application, as shown in Table 20.

[0342] Table 20 Basic parameters of the optical lens of Example 7

[0343] focal length f 15.00mm Aperture F value 1.93 Field of view FOV 15.56° Optical total length TTL 5.9mm Design wavelength 656nm, 587nm, 546nm, 486nm, 435nm

[0344] Table 21 Aspheric coefficients of the optical lens of Example 7

[0345]

[0346]

[0347] Where k is the cone coefficient, and A4, A6, A8, A10, A12, A14, A16, and A20 are aspheric coefficients.

[0348] The aspheric surface of each lens in the optical lens in the seventh embodiment can use the aspheric surface shown in the aspheric surface equation in the first embodiment, or other aspheric surface formulas can be used, which is not limited in this application.

[0349] The design parameters of the optical lens of Example 7 of the present application are given above. The entrance pupil diameter of the optical lens is 7.75 mm, the maximum field angle is 15.56°, the aperture F value is 1.93, and the total optical length is 5.9 mm. Figures 28-30 The optical performance of the optical lens designed with the lens combination mode of Example 7 is described.

[0350] Figure 28 The longitudinal spherical aberration of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm after passing through the optical lens of Example 7 is shown. Figure 28 It can be seen that the offset of each wavelength of light at the focus is controlled within the range of -0.05mm to 0.01mm, which can focus most of the light on the correct focus point, making the image clearer and sharper.

[0351] Figure 29 Schematic diagram showing astigmatism and field curvature of light with a reference wavelength of 587 nm after passing through the optical lens of Example 7. Figure 29 The solid line is the focus offset in the meridional direction, and the dashed line is the focus offset in the sagittal direction. Figure 29 As can be seen, the focus offset in the meridional direction is controlled within the range of -0.02mm to 0, and the focus offset in the sagittal direction is controlled within the range of -0.01mm to 0.002mm. The optical lens of Example 7 not only achieves high sharpness at the focal point, but also maintains sharpness from the focal point to the edge without fluctuation or monotonous decrease.

[0352] Figure 30 A schematic diagram showing optical distortion of light with a reference wavelength of 587 nm after passing through the optical lens of Example 7 is shown. Figure 30 It can be seen that the distortion is controlled within 0.7%. The optical lens of Example 7 has low distortion and excellent imaging quality.

[0353] Table 22 lists the conditional expressions satisfied by the above optical lens and the values ​​corresponding to each conditional expression in the embodiments of the present application.

[0354] Table 22 Conditional expressions satisfied by optical lenses and corresponding values ​​of each conditional expression

[0355]

[0356] Under the premise of the same focal length, compared with an optical lens whose lenses are all lenses, the optical lens in this application can effectively reduce the total optical length.

[0357] An embodiment of the present application further provides a lens module 100 , which includes an electronic photosensitive element 60 and an optical lens provided by any of the aforementioned embodiments, and the optical lens is used to image light onto the electronic photosensitive element 60 .

[0358] The electronic photosensitive element 60 is disposed behind the infrared cutoff filter 50. The electronic photosensitive element 60 is a complementary metal-oxide semiconductor (CMOS) image sensor or a charge coupled device (CCD) image sensor.

[0359] Specifically, the optical lens is used to generate a light signal from the subject and reflect it to the electronic photosensitive element 60, which then converts the light signal corresponding to the subject into an image signal. The electronic photosensitive element 60 is primarily used to perform photoelectric conversion and analog / digital (A / D) conversion on the light signal, thereby outputting image data for display on a display unit such as a screen.

[0360] Since the lens module 100 adopts the above-mentioned optical lens, the lens module 100 also has the advantages of long focal length, short total optical length, miniaturization, etc. corresponding to the optical lens.

[0361] Optionally, the lens module 100 may further include some or all of the components (not shown) such as a holder, an autofocus drive assembly, a circuit board, a connector, and peripheral electronic components. The holder can be used to secure the lens, and the autofocus drive assembly may include a voice coil motor, a driver integrated circuit, etc., for performing autofocus or optical image stabilization on the lens. The circuit board may be a flexible printed circuit (FPC) or a printed circuit board (PCB) for transmitting electrical signals, wherein the FPC may be a single-sided flexible board, a double-sided flexible board, a multi-layer flexible board, a rigid-flexible board, or a flexible circuit board with a hybrid structure.

[0362] Figure 31 Schematic diagram of an electronic device provided in an embodiment of the present application. Figure 31 Parts (a) and (b) are the front view and back view of the electronic device, respectively.

[0363] like Figure 31 As shown, an embodiment of the present application further provides an electronic device. The electronic device includes the lens module 100 provided in the above embodiment and further includes a processor. The lens module 100 is used to acquire image data and input the image data into the processor, which is used to process the image data.

[0364] The number of lens modules 100 installed is not limited to one, and can be two or even more, for example, two lens modules 100 are installed on the back of the electronic device. The embodiment of the present application does not impose any limitation on the number of lens modules 100 installed.

[0365] The lens module 100 can be used to shoot external videos or photos, and can be used to shoot scenes at different distances. For example, the lens module 100 can be used to shoot distant scenes, close scenes, and macro scenes. The lens module 100 can also be used for selfies. The lens module 100 shown on the back of the mobile phone can also be used as a front camera, etc.

[0366] In addition, the electronic device also includes a shell 200 and a display screen 300. The display screen 300 is installed on the shell 200. A accommodating space is formed in the shell 200. The lens module 100 can be installed in the accommodating space. The display screen 300 is electrically connected to the processor. The display screen 300 can display pictures or videos that have been processed by the processor.

[0367] Since the lens module 100 has the advantage of miniaturization, the size requirement for the accommodating space becomes lower. Therefore, the electronic device can be made thinner and lighter by reducing the thickness of the shell 200. Alternatively, without changing the thickness of the shell 200, the accommodating space saved by the lens module 100 can be made available for other functional components.

[0368] Optionally, the display screen 300 may be a light emitting diode (LED) display screen, a liquid crystal display (LCD) display screen, or an organic light emitting diode (OLED) display screen, but is not limited thereto.

[0369] Optionally, the housing 200 may further include other components, such as a battery, a flash, a fingerprint recognition module, an earpiece, a circuit board, a sensor, etc., but is not limited thereto.

[0370] Optionally, the electronic device may be a terminal device with a video or photo recording function, such as a mobile phone, a tablet computer, a laptop computer, a video camera, a video recorder, a camera, an intelligent robot, or other devices with a video or photo recording function.

[0371] Finally, it should be noted that the above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. An optical lens, characterized in that: include: A first optical element (10) includes a light-impermeable area (12) located in the middle and a light-transmitting area (11) located on the periphery, wherein the light-transmitting area (11) is used for allowing light to pass through, and a convex reflecting surface (121) is provided on the image side of the light-impermeable area (12); A lens group (30) includes a plurality of lenses arranged in sequence from the object side to the image side; a second optical element (20) arranged in an annular shape on the periphery of the lens group (30), the second optical element (20) having a concave reflecting surface (21); the concave reflecting surface (21) is used to converge the light and reflect it to the convex reflecting surface (121); the convex reflecting surface (121) is used to diverge the light and reflect it to the lens group (30); the lens group (30) is used to image the light on a focal plane; The optical lens satisfies the following relationship: 0>f 1-2 / f 3-n >-3.5; Among them, f 1-2 is the combined focal length of the first optical element (10) and the second optical element (20), f 3-n is the combined focal length of the lens group (30); 1≤WD3 / EPD≤1.1; Wherein, WD3 is the diameter of the image formed on the object side by the first lens in the lens group (30) through the first optical element (10) and the second optical element (20), and EPD is the entrance pupil diameter of the optical lens.

2. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: TTL / f<0.5; Wherein, TTL is the total optical length of the optical lens, and f is the focal length of the optical lens.

3. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies the following relationship: Imgh / TTL>0.1; Wherein, Imgh is half of the diagonal length of the pixel area of ​​the electronic photosensitive element (60) on the focusing plane.

4. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies the following relationship: Imgh / D1>0.3; Wherein, D1 is the radius of the outer circumference of the first optical element (10).

5. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies the following relationship: OAL 3-n / TTL<0.6; Among them, OAL 3-n It is the distance on the optical axis from the object side of the first lens to the image side of the last lens in the lens group (30).

6. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies the following relationship: f / EPD<2.

5.

7. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies the following relationship: DC2 / EPD<0.35; Wherein, DC2 is the diameter of the convex reflecting surface (121).

8. The optical lens according to claim 1 or 2, wherein: The optical lens satisfies the following relationship: (ct3+ct4) / ct 3-4 >2; Wherein, ct3 is the thickness on the optical axis of the first lens in the lens group (30), ct4 is the thickness on the optical axis of the second lens in the lens group (30), and ct 3-4 It is the distance on the optical axis between the first lens and the second lens in the lens group (30).

9. The optical lens according to claim 1 or 2, wherein: The optical lens satisfies the following relationship: f 1-2 / f<1。 10. The optical lens according to claim 1 or 2, characterized in that: The first lens in the lens group (30) has positive optical power or negative optical power; the object side surface of the first lens in the lens group (30) is convex near the optical axis, and the image side surface is concave near the optical axis; the object side surface of the first lens in the lens group (30) is convex near the periphery, and the image side surface is concave near the periphery.

11. The optical lens according to claim 1 or 2, characterized in that: The secondary lens in the lens group (30) has positive optical power or negative optical power; the object side surface of the secondary lens in the lens group (30) is convex near the optical axis, and the image side surface is concave near the optical axis; the object side surface of the secondary lens in the lens group (30) is concave near the periphery, and the image side surface is convex near the periphery.

12. A lens module, characterized in that: The invention comprises an electronic photosensitive element (60) and an optical lens according to any one of claims 1 to 11, wherein the optical lens is used for imaging light onto the electronic photosensitive element (60).

13. An electronic device, characterized in that: It comprises a processor and the lens module as claimed in claim 12, wherein the lens module is used to obtain image data and input the image data into the processor, and the processor is used to process the image data.

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