Optical lens, camera module and terminal equipment

Abstract

The invention discloses an optical lens, a camera module and a terminal device, the optical lens comprises seven lenses, the first lens has negative refractive power, and the object side surface and the image side surface of the first lens are a convex surface and a concave surface near an optical axis respectively; the second lens element with negative refractive power has a concave object-side surface and a convex image-side surface in paraxial regions, respectively. The third lens element with positive refractive power has an object-side surface and an image-side surface being convex in a paraxial region. The fourth lens element with positive refractive power has an object-side surface and an image-side surface being convex in a paraxial region thereof. The fifth lens element with positive refractive power has an object-side surface and an image-side surface being convex in a paraxial region. The sixth lens element with negative refractive power has an object-side surface and an image-side surface being concave in a paraxial region. The seventh lens element with positive refractive power has a convex object-side surface and a concave image-side surface in paraxial regions, respectively. The optical lens satisfies the following relational expressions: FOV is greater than or equal to 130 degrees and less than or equal to 160 degrees, and R6 / F3 is greater than or equal to-7.5 and less than or equal to-3.0.

Description

Technical Field

[0001] The present application relates to the field of optical imaging technology, and in particular to an optical lens, a camera module and a terminal device. Background Art

[0002] With the continuous development of the automotive industry, the demand for in-vehicle lenses is increasing. In application scenarios such as traffic safety monitoring and autonomous driving assistance, lenses are required to cover a wider field of view to obtain more road condition information. Among them, optical lenses can be widely used in in-vehicle reversing visual systems, driving recorders, automatic parking and panoramic parking systems, road finding systems, etc.

[0003] The vehicle-mounted lens is a key component for the automated driving assistance system to obtain external information. With the rapid development of automated driving assistance systems, the performance requirements for forward-looking optical lenses are becoming increasingly higher. However, traditional vehicle-mounted lenses have limitations in image size and field of view, and cannot meet the requirements for large-scene monitoring in current complex traffic environments. In addition, a small field of view may lead to monitoring blind spots, posing a potential threat to driving safety. Therefore, the market currently needs an optical lens with a large field of view, high image plane, and low distortion to meet automotive forward-looking applications. Summary of the invention

[0004] The embodiments of the present application disclose an optical lens, a camera module and a terminal device, which can meet the requirements of a large field of view, high relative illumination and a miniaturized design.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the present application discloses an optical lens, which has seven lenses with refractive power, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side along the optical axis;

[0006] The first lens has negative refractive power, the object side surface of the first lens is convex at the near optical axis, and the image side surface of the first lens is concave at the near optical axis;

[0007] The second lens has negative refractive power, the object side surface of the second lens is concave at the near optical axis, and the image side surface of the second lens is convex at the near optical axis;

[0008] The third lens has positive refractive power, and the object side surface and the image side surface of the third lens are both convex surfaces at the near optical axis;

[0009] The fourth lens has positive refractive power, and the object side surface and the image side surface of the fourth lens are both convex surfaces near the optical axis;

[0010] The fifth lens has positive refractive power, and the object side surface and the image side surface of the fifth lens are both convex surfaces near the optical axis;

[0011] The sixth lens has negative refractive power, and the object side surface and the image side surface of the sixth lens are both concave surfaces near the optical axis;

[0012] The seventh lens has positive refractive power, the object side surface of the seventh lens is convex at the near optical axis, and the image side surface of the seventh lens is concave at the near optical axis;

[0013] The optical lens satisfies the following relationship:

[0014] 130°≤FOV≤160° and -7.5≤R6 / F3≤-3.0;

[0015] Among them, FOV is the maximum field of view of the optical lens, FNO is the aperture number of the optical lens, R6 is the radius of curvature of the image side of the third lens at the optical axis, and F3 is the focal length of the third lens.

[0016] In the optical lens provided by the present application, in order to meet the requirements of wide angle, high pixel, large image surface and small distortion, the first lens has a negative refractive power, and the object side is convex at the near optical axis, and the image side is concave at the near optical axis, so that the first lens is formed into a meniscus shape with the convex surface facing the object side, which can effectively collect incident light with a large field of view angle, and realize the maximum field of view angle FOV>70° of the fixed focus lens. The second lens has a negative refractive power, and the object side is concave at the near optical axis, which can preliminarily correct the astigmatism of the optical lens and effectively control the trend of light. The third lens has a positive refractive power, and the object side and the image side are both convex at the near optical axis, which can effectively collect and compress the incident light on the object side, so that the light smoothly transitions to the optical lens on the image side. The fourth lens has a positive refractive power, the object side is convex at the near optical axis, and the image side is convex at the near optical axis, which is conducive to lowering the incident angle of the light after the light passes through the aperture, so that more light enters the optical lens on the image side, and improves the illumination of the optical lens. The fifth lens has positive refractive power, and both the object side and the image side are convex at the near optical axis, which is beneficial to reducing the chromatic aberration of the optical lens. At the same time, the fifth lens has positive refractive power and is also beneficial to converge light and reduce the total length of the optical lens. The sixth lens has negative refractive power, and both the object side and the image side are concave at the near optical axis. Combined with the positive refractive power of the fifth lens, it helps to eliminate chromatic aberration, correct astigmatism, improve resolution, and help slow down the angle of light deflection and reduce the sensitivity of the optical lens. The seventh lens has positive refractive power, and the object side is convex at the near optical axis, and the image side is concave at the near optical axis. It can converge light and reduce the total length of the optical lens, further realizing the miniaturization design of the optical lens.

[0017] The optical lens satisfies the relationship 130°≤FOV≤160°. By reasonably setting the maximum field of view of the optical lens, a sufficient field of view can be provided for the optical lens to meet the large field of view requirement of the optical lens.

[0018] The optical lens satisfies the relationship -7.5≤R6 / F3≤-3.0, which can effectively correct the astigmatism and distortion of the optical lens, shorten the back focal length of the optical lens, ensure the miniaturization design of the optical lens, and also improve the relative illumination and imaging quality of the optical lens.

[0019] As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0020] 6.8≤TTL / F≤7.7, and / or, 79°≤FOV / FNO≤98°, and / or, 7.5≤TTL / BFL≤9.9;

[0021] Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, F is the focal length of the optical lens, and BFL is the distance from the image side of the seventh lens to the imaging surface of the optical lens on the optical axis.

[0022] The optical lens satisfies the relationship 6.8≤TTL / F≤7.7, which is conducive to miniaturization of the optical lens, improvement of resolution, and reduction of lens sensitivity, while also enabling the optical lens to have a wide-angle characteristic.

[0023] The optical lens satisfies the relationship 79°≤FOV / FNO≤98°. By reasonably controlling the relationship between the field of view angle and the aperture number of the optical lens, a reasonable field of view angle and aperture number are provided for the optical lens, which can take into account both the design difficulty and the field of view angle requirements, while allowing the aperture to vary within a reasonable range, providing a combination effect of a large viewing angle and a large aperture, satisfying the characteristics of the optical lens with a large aperture, high relative illumination and small distortion.

[0024] The optical lens satisfies the relationship 7.5≤TTL / BFL≤9.9. By reasonably controlling the distance from the image side surface of the seventh lens to the imaging surface of the optical lens on the optical axis, it is beneficial to realize the miniaturization design of the optical lens.

[0025] As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0026] 0.19≤SD1 / TTL≤0.23, and / or, 1.3≤SD1 / IMGH≤1.55, and / or, 6.5≤TTL / IMGH≤6.8;

[0027] Among them, SD1 is the maximum effective semi-aperture of the object side of the first lens, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, and IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens.

[0028] The optical lens satisfies the relationship 0.19≤SD1 / TTL≤0.23. By controlling the ratio of half of the maximum effective aperture of the object side of the first lens to the total optical length of the optical lens, the head size and volume of the lens can be limited to achieve miniaturization.

[0029] The optical lens satisfies the relationship 1.3≤SD1 / IMGH≤1.55, and the size of the maximum effective aperture of the object side of the first lens is reasonably controlled, which is conducive to the miniaturization design of the optical lens.

[0030] The optical lens satisfies the relationship 6.5≤TTL / IMGH≤6.8. Under a certain image height, the total length of the optical lens can be controlled by controlling the ratio of the image height to the total optical length of the optical lens, which is conducive to miniaturization of the optical lens.

[0031] As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0032] 0.65≤CT12 / (CT1+CT2)≤0.95, and / or, 1.9≤CT5 / CT6≤4, and / or, -30≤F2 / CT2≤-9;

[0033] Among them, CT12 is the distance from the image side surface of the first lens to the object side surface of the second lens on the optical axis, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, F2 is the focal length of the second lens, CT5 is the thickness of the fifth lens on the optical axis, and CT6 is the thickness of the sixth lens on the optical axis.

[0034] The optical lens satisfies the relationship 0.65≤CT12 / (CT1+CT2)≤0.95. By reasonably controlling the ratio of the distance between the first lens and the second lens on the optical axis to the sum of the thicknesses of the first lens and the second lens on the optical axis, the total length of the optical lens is shortened and the structure of the optical lens is made more compact.

[0035] The optical lens satisfies the relationship 1.9≤CT5 / CT6≤4. By reasonably controlling the thickness ratio of the fifth lens and the sixth lens on the optical axis, it is beneficial to make the light pass smoothly through the cemented lens formed by the fifth lens and the sixth lens, thereby reducing aberrations.

[0036] The optical lens satisfies the relationship -30≤F2 / CT2≤-9. The second lens provides negative refractive power for the optical lens, which is beneficial to expanding the width of light, so that the light with a large angle is widened after being refracted by the first lens and is fully transmitted to the high-pixel imaging surface, thereby obtaining a wider field of view, which is beneficial to improving pixels.

[0037] As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0038] 5≤R1 / R2≤20, and / or, 0.8≤R3 / (R4+CT2)≤1.8, and / or, -0.3≤R5 / R6≤0;

[0039] Among them, R1 is the curvature radius of the object side of the first lens at the optical axis, R2 is the curvature radius of the image side of the first lens at the optical axis, R3 is the curvature radius of the object side of the second lens at the optical axis, R4 is the curvature radius of the image side of the second lens at the optical axis, CT2 is the thickness of the second lens on the optical axis, and R5 is the curvature radius of the object side of the third lens at the optical axis.

[0040] The optical lens satisfies the relationship 5≤R1 / R2≤20. By reasonably matching the ratio of the curvature radius of the object side and the image side of the first lens, the surface difference of the first lens is reasonably set, which is beneficial to control the shape of the first lens, correct the aberration generated by itself, and improve the imaging quality. In addition, it is also beneficial to the molding of the first lens and reduce the difficulty of processing.

[0041] The optical lens satisfies the relationship 0.8≤R3 / (R4+CT2)≤1.8, and the curvature radii of the object side and the image side of the second lens are reasonably matched so that the shape of the second lens is close to concentric arc rings, which is beneficial to the smooth transition of the light trend, and is beneficial to reducing the front port diameter of the optical lens, reducing the size of the lens, and is beneficial to miniaturizing the lens and reducing the manufacturing cost.

[0042] The optical lens satisfies the relationship -0.3≤R5 / R6≤0. Reasonable setting of the curvature radii of the object side and the image side of the third lens can effectively collect and compress the incident light after being refracted by the first lens and the second lens, so that the light can smoothly transition to the rear optical lens, reduce aberrations, and improve the imaging quality of the optical lens.

[0043] As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0044] 8≤|F / F56|≤85, and / or, 7≤|TTL / (CT5+CT6)|≤11, and / or,|(Vd5-Vd6) / F56|≤2.5mm -1 ;

[0045] Among them, F is the focal length of the optical lens, F56 is the focal length of the combined lens composed of the fifth lens and the sixth lens, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, Vd5 is the Abbe number of the fifth lens, and Vd6 is the Abbe number of the sixth lens.

[0046] The optical lens satisfies the relationship 8≤∣F / F56∣≤85. Reasonable matching of the focal length of the cemented lens is conducive to correcting chromatic aberration and balancing various aberrations, improving resolution, and can effectively reduce tolerance sensitivity and improve the imaging quality of the optical lens.

[0047] The optical lens satisfies the relationship 7≤|TTL / (CT5+CT6)|≤11. Properly increasing the center thickness of the cemented lens within a certain range is beneficial to enhancing its light control ability, which is beneficial to controlling more light to enter the rear system and improving relative illumination.

[0048] The optical lens satisfies the relationship |(Vd5-Vd6) / F56|≤2.5mm -1 By reasonably setting the ratio of the difference in Abbe numbers between the fifth lens and the sixth lens to the combined focal length of the fifth lens and the sixth lens, the chromatic aberration of the optical lens can be effectively corrected, the authenticity of the color can be restored, and the imaging quality can be improved.

[0049] As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0050] 0.95≤CT7 / ET7≤1.6, and / or, 7≤|TTL / (SD14 / SAGS14)|≤20, and / or, 3≤F7 / F≤12;

[0051] Among them, CT7 is the thickness of the seventh lens on the optical axis, ET7 is the distance from the maximum effective aperture of the object side surface of the seventh lens to the maximum effective aperture of the image side surface of the seventh lens in the direction of the optical axis, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, SD14 is the maximum effective semi-aperture of the image side surface of the seventh lens, SAGS14 is the distance from the intersection of the image side surface of the seventh lens and the optical axis to the maximum effective aperture of the image side surface of the seventh lens on the optical axis, F7 is the focal length of the seventh lens, and F is the focal length of the optical lens.

[0052] The optical lens satisfies the relationship 0.95≤CT7 / ET7≤1.6, and the thickness ratio of the seventh lens can be reasonably controlled, thereby optimizing the surface shape of the seventh lens, which is beneficial to the effective convergence of large-angle incident light and makes the light passing through the seventh lens have a smaller deflection angle, thereby reducing the generation of stray light and ensuring good imaging performance.

[0053] The optical lens satisfies the relationship 7≤|TTL / (SD14 / SAGS14)|≤20, which can optimize the surface shape of the image side of the seventh lens and is beneficial to the assembly of the optical lens.

[0054] The optical lens satisfies the relationship 3≤F7 / F≤12. Reasonable allocation of the focal length of the seventh lens is beneficial to correcting the aberration of the optical lens and improving the imaging quality.

[0055] As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

[0056] 31mm≤TTL*IMGH / F≤35mm, and / or, 0.3≤∑CT / ∑AT≤2.1, and / or, 1≤SD4 / SD3≤1.25;

[0057] Wherein, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, IMGH is half of the image height corresponding to the maximum field angle of the optical lens, F is the focal length of the optical lens, ∑CT is the sum of the thicknesses of all lenses from the first lens to the seventh lens on the optical axis, ∑AT is the sum of the air intervals between two adjacent lenses from the first lens to the seventh lens, SD3 is the maximum effective semi-aperture of the object side surface of the second lens, and SD4 is the maximum effective semi-aperture of the image side surface of the second lens.

[0058] The optical lens satisfies the relationship 31mm≤TTL*IMGH / F≤35mm, which can enable the optical lens to meet the needs of a large target surface while satisfying the needs of adapting the optical lens to a large-size imaging surface and miniaturizing the optical lens.

[0059] The optical lens satisfies the relationship 0.3≤∑CT / ∑AT≤2.1. By reasonably controlling the ratio of the sum of the thicknesses of all lenses on the optical axis to the sum of the air intervals between two adjacent lenses from the first lens to the seventh lens, the overall structure of the optical lens is made more compact, which is beneficial to shortening the total length of the optical lens, thereby realizing the miniaturization of the optical lens.

[0060] The optical lens satisfies the relationship 1≤SD4 / SD3≤1.25, so the second lens has a small aperture characteristic, which can effectively converge the light from the first lens, so that the light can better enter the imaging surface of the optical lens.

[0061] In a second aspect, the present application discloses a camera module, which includes an image sensor and any one of the above-mentioned optical lenses, wherein the image sensor is arranged on the image side of the optical lens.

[0062] In a third aspect, the present application discloses a terminal device, including a shell and the above-mentioned camera module, wherein the camera module is arranged in the shell.

[0063] Compared with the prior art, the beneficial effects of this application are:

[0064] In the optical lens provided by the present application, in order to meet the requirements of wide angle, high pixel, large image surface and miniaturization design, the first lens has negative refractive power, and the object side is convex at the near optical axis, and the image side is concave at the near optical axis. The convex surface is facing the object side in a meniscus shape, which can effectively collect incident light with a large field of view angle, and achieve a maximum field of view angle FOV>70° of the fixed focus lens. The second lens has negative refractive power, and the object side is concave at the near optical axis, which can preliminarily correct the astigmatism of the optical lens, and effectively control the trend of light to achieve a larger aperture. The third lens L3 has positive refractive power, and the object side is convex at the near optical axis, and the image side can be convex at the near optical axis, which can effectively collect and compress the incident light on the object side, so that the light smoothly transitions to the optical lens on the image side. The fourth lens L4 has positive focal power, and the object side surface is convex, and the image side surface is convex, which is conducive to lowering the incident angle of the light after the light passes through the aperture, so that more light enters the optical lens on the image side, and improves the illumination of the optical lens. The fifth lens has positive refractive power, and the object side surface and the image side surface are convex at the near optical axis, which is conducive to reducing the chromatic aberration of the optical lens. At the same time, the fifth lens has positive refractive power and is also conducive to convergence of light and reducing the total length of the optical lens. The sixth lens has negative refractive power, and the object side surface and the image side surface are concave at the near optical axis. With the positive refractive power of the fifth lens, it helps to eliminate chromatic aberration, correct astigmatism, improve resolution, and help to slow down the angle of light deflection and reduce the sensitivity of the optical lens. The seventh lens has positive refractive power, and the object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. It can converge light, reduce the total length of the optical lens, and further realize the miniaturization design of the optical lens.

[0065] The optical lens satisfies the relationship 130°≤FOV≤160°. By reasonably setting the maximum field of view of the optical lens, a sufficient field of view can be provided for the optical lens to meet the large field of view requirement of the optical lens.

[0066] The optical lens satisfies the relationship -7.5≤R6 / F3≤-3.0, which can effectively correct the astigmatism and distortion of the optical lens, shorten the back focal length of the optical lens, ensure the miniaturization design of the optical lens, and also improve the relative illumination and imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0068] Figure 1 is a schematic structural diagram of the optical lens disclosed in Example 1 of the present application;

[0069] Figure 2 is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Example 1 of the present application;

[0070] Figure 3 is a schematic structural diagram of the optical lens disclosed in Example 2 of the present application;

[0071] Figure 4 is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Example 2 of the present application;

[0072] Figure 5 is a schematic diagram of the structure of the optical lens disclosed in Example 3 of the present application;

[0073] Figure 6 is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Example 3 of the present application;

[0074] Figure 7 is a schematic structural diagram of the optical lens disclosed in Example 4 of the present application;

[0075] Figure 8 is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Example 4 of the present application;

[0076] Fig. 9 is a schematic structural diagram of the optical lens disclosed in Example 5 of the present application;

[0077] Fig.10 is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens disclosed in Example 5 of the present application;

[0078] Fig.11 It is a structural schematic diagram of the camera module disclosed in this application;

[0079] Fig.12 It is a schematic diagram of the structure when the terminal device disclosed in the present application is a car. DETAILED DESCRIPTION

[0080] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0081] In the present application, the directions or positional relationships indicated by the terms "upper", "front", "back", "top", "inner", "outer", "middle", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0082] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0083] In addition, the term "disposed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0084] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0085] Although some optical lenses for automobile applications have been proposed in the related art, there are some problems with the optical lenses in the related art. For example, the optical lenses in the related art cannot simultaneously meet the requirements of high resolution and miniaturization; although the related art can achieve a resolution of one million pixels, the lens aberrations such as chromatic aberration, astigmatism, and distortion are relatively serious; the related art has weak light transmission capability and cannot adapt to the dark environment at night or on rainy days; the related art cannot simultaneously meet the requirements of small front port diameter and miniaturization; the related art cannot simultaneously meet the requirements of large aperture and high resolution.

[0086] The technical solution of the present application will be further described below in conjunction with embodiments and drawings.

[0087] See also Figure 1 The present application discloses an optical lens 100, which includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7, which are arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens L1 has a negative refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a positive refractive power, the fifth lens L5 has a positive refractive power, the sixth lens L6 has a negative refractive power, and the seventh lens L7 has a positive refractive power. When imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 in sequence from the object side of the first lens L1, and finally forms an image on the imaging surface 101 of the optical lens 100.

[0088] Furthermore, the object-side surface 11 of the first lens L1 is convex at the near optical axis, and the image-side surface 12 of the first lens L1 is concave at the near optical axis; the object-side surface 21 of the second lens L2 is concave at the near optical axis, and the image-side surface 22 of the second lens L2 is convex at the near optical axis; the object-side surface 31 of the third lens L3 is convex at the near optical axis, and the image-side surface 32 of the third lens L3 is convex at the near optical axis; the object-side surface 41 of the fourth lens L4 is Convex surface, the image side surface 42 of the fourth lens L4 is convex at the near optical axis; the object side surface 51 of the fifth lens L5 is convex at the near optical axis, and the image side surface 52 of the fifth lens L5 is convex at the near optical axis; the object side surface 61 of the sixth lens L6 is concave at the near optical axis, and the image side surface 62 of the sixth lens L6 is concave at the near optical axis; the object side surface 71 of the seventh lens L7 is convex at the near optical axis, and the image side surface 72 of the seventh lens L7 is concave at the near optical axis.

[0089] Optionally, all lenses in the optical lens 100 may be made of glass, or may be made of plastic, or some lenses may be made of glass and some lenses may be made of plastic. Preferably, all lenses in the optical lens 100 are made of glass. Lenses made of glass can suppress the deviation of the back focus of the optical lens 100 due to temperature changes, so as to improve the stability of the optical lens 100. At the same time, the use of glass material can avoid the blurring of the optical lens 100 caused by high and low temperature changes in the use environment, which affects the normal use of the optical lens 100.

[0090] Optionally, the seventh lens L7 can be an aspherical lens, and the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 can be spherical lenses. The combination of spherical lenses and aspherical lenses can improve high-order aberrations and thereby improve the imaging quality of the optical lens 100.

[0091] In some embodiments, the optical lens 100 further includes a stop 102, which may be an aperture stop and / or a field stop, and may be disposed between the image side surface 32 of the third lens L3 and the object side surface 41 of the fourth lens L4 of the optical lens 100. It is understood that, in other embodiments, the stop 102 may also be disposed between other lenses, and the setting may be adjusted according to actual conditions, and this embodiment is not specifically limited thereto.

[0092] In some embodiments, the optical lens 100 further includes a filter 110, and the filter 110 can be disposed between the image side surface 72 of the seventh lens L7 and the imaging surface 101 of the optical lens 100. Of course, in other embodiments, the filter 110 can also be disposed between other lenses, and the setting can be adjusted according to actual conditions, and this embodiment is not specifically limited. In this embodiment, the filter 110 can use an infrared cutoff filter, so that light of other bands such as infrared light can be filtered out, and only visible light can be allowed to pass through, so that the imaging is more in line with the visual experience of the human eye. Of course, the filter 110 can also use an infrared bandpass filter, so that light of other bands such as visible light can be filtered out, and only infrared light can be allowed to pass through, and the imaging quality can be improved by filtering out light of other bands such as visible light; and the optical lens 100 can be used as an infrared optical lens 100, that is, the optical lens 100 can also form an image in a dim environment and other special application scenarios and can obtain a better imaging effect. Preferably, the filter 110 may be made of glass. Of course, in other embodiments, the filter 110 may also be made of optical glass coating, or a filter 110 of other materials, which may be selected according to actual needs and is not specifically limited in this embodiment.

[0093] In some embodiments, the optical lens 100 further includes a protective glass 120 , which is disposed between the filter 110 and the imaging surface 101 , so that the protective glass 120 can be close to the image sensor during subsequent assembly, thereby playing a protective role.

[0094] In one embodiment, the optical lens 100 satisfies the relationship 130°≤FOV≤160°, where FOV is the maximum field of view of the optical lens 100. By reasonably setting the maximum field of view of the optical lens 100, a sufficient field of view can be provided for the optical lens 100 to meet the large field of view requirement of the optical lens 100.

[0095] In one embodiment, the optical lens 100 satisfies the relationship -7.5≤R6 / F3≤-3.0, R6 is the radius of curvature of the image side surface 32 of the third lens L3 at the optical axis, and F3 is the focal length of the third lens L3. This can effectively correct the astigmatism and distortion of the optical lens 100, shorten the back focal length of the optical lens 100, ensure the miniaturization design of the optical lens 100, and also improve the relative illumination and imaging quality of the optical lens 100.

[0096] In one embodiment, the optical lens 100 satisfies the relationship 6.8≤TTL / F≤7.7, where TTL is the total length of the optical lens, and F is the focal length of the optical lens 100. The total length of the optical lens 100 and the focal length of the optical lens 100 can be reasonably controlled, so that the optical lens 100 has a reasonable focal length without causing the total length of the optical lens 100 to be too long, which is conducive to miniaturizing the optical lens 100, improving the resolution, and reducing the sensitivity of the lens.

[0097] In one embodiment, the optical lens 100 satisfies the relationship 79°≤FOV / FNO≤98°. By reasonably controlling the relationship between the field of view FOV and the aperture number FNO of the optical lens 100, a reasonable field of view and aperture number are provided for the optical lens 100, which can take into account both the design difficulty and the field of view requirements, while allowing the aperture to vary within a reasonable range, providing a combination effect of a large viewing angle and a large aperture, and satisfying the characteristics of the optical lens 100 having a large aperture, high relative illumination and small distortion.

[0098] In one embodiment, the optical lens 100 satisfies the relationship 7.5≤TTL / BFL≤9.9, where BFL is the distance from the image side surface 72 of the seventh lens L7 to the imaging surface 101 of the optical lens 100 on the optical axis. By reasonably controlling the distance from the image side surface 72 of the seventh lens L7 to the imaging surface 101 of the optical lens 100 on the optical axis, it is beneficial to achieve a miniaturized design of the optical lens 100.

[0099] In one embodiment, the optical lens 100 satisfies the relationship 0.19≤SD1 / TTL≤0.23, SD1 is half of the maximum effective aperture of the object side surface 11 of the first lens L1, and by controlling the ratio of half SD1 of the maximum effective aperture of the object side surface 11 of the first lens L1 to the total optical length TTL of the optical lens 100, the head size and volume of the lens can be limited to achieve miniaturization.

[0100] In one embodiment, the optical lens 100 satisfies the relationship 1.3≤SD1 / IMGH≤1.55, IMGH is half of the image height corresponding to the maximum field of view FOV of the optical lens 100, and by reasonably controlling the maximum effective aperture size of the object side surface 11 of the first lens L1, it is beneficial to achieve a miniaturized design of the optical lens 100.

[0101] In one embodiment, the optical lens 100 satisfies the relationship 6.5≤TTL / IMGH≤6.8. Under a certain image height, by controlling the ratio of the image height IMGH of the optical lens 100 to the total optical length TTL, it is beneficial to achieve miniaturization of the optical lens 100.

[0102] In one embodiment, the optical lens 100 satisfies the relationship 0.65≤CT12 / (CT1+CT2)≤0.95, where CT1 is the thickness of the first lens L1 on the optical axis, CT2 is the thickness of the second lens L2 on the optical axis, and CT12 is the distance between the image side surface 12 of the first lens L1 and the object side surface 21 of the second lens L2 on the optical axis. By reasonably controlling the ratio of the distance between the first lens L1 and the second lens L2 on the optical axis to the sum of the thicknesses of the first lens L1 and the second lens L2 on the optical axis, the overall length of the optical lens 100 is shortened, making the structure of the optical lens 100 more compact.

[0103] In one embodiment, the optical lens 100 satisfies the relationship 1.9≤CT5 / CT6≤4, CT5 is the thickness of the fifth lens L5 on the optical axis, and CT6 is the thickness of the sixth lens L6 on the optical axis. By reasonably controlling the thickness ratio of the fifth lens L5 and the sixth lens L6 on the optical axis, it is beneficial to make light pass through the cemented lens smoothly and reduce aberrations.

[0104] In one embodiment, the optical lens 100 satisfies the relationship -30≤F2 / CT2≤-9, F2 is the focal length of the second lens L2, and the second lens L2 provides negative refractive power for the optical lens 100, which is beneficial to expanding the width of light, so that the light with a large angle is widened after being refracted by the first lens L1, and is fully transmitted to the high-pixel imaging surface 101, thereby obtaining a wider field of view, which is beneficial to improving pixels.

[0105] In one embodiment, the optical lens 100 satisfies the relationship 5≤R1 / R2≤20, R1 is the curvature radius of the object side surface 11 of the first lens L1 at the optical axis, and R2 is the curvature radius of the image side surface 12 of the first lens L1 at the optical axis. By reasonably matching the ratio of the curvature radii of the object side surface 11 and the image side surface 12 of the first lens L1, the surface shape difference of the first lens L1 is reasonably set, which is beneficial to controlling the shape of the first lens L1, correcting the aberration generated by itself, and improving the imaging quality.

[0106] In one embodiment, the optical lens 100 satisfies the relationship -0.3≤R5 / R6≤0, R5 is the curvature radius of the object side surface 31 of the third lens L3 at the optical axis, and R6 is the curvature radius of the image side surface 32 of the third lens L3 at the optical axis. By reasonably setting the curvature radii of the object side surface 31 and the image side surface 32 of the third lens L3, the incident light refracted by the first lens L1 and the second lens L2 can be effectively collected and compressed, so that the light can smoothly transition to the rear optical lens 100, reduce aberrations, and improve the imaging quality of the optical lens 100.

[0107] In one embodiment, the optical lens 100 satisfies the relationship 0.6≤R3 / R4≤0.75, -0.4≤R7 / R8≤-0.15, -1.5≤R9 / R10≤-0.8, -0.6≤R11 / R12≤-0.3, 0.1≤R13 / R14≤0.7, wherein R3 is the radius of curvature of the object side surface 21 of the second lens L2 at the optical axis, R4 is the radius of curvature of the image side surface 22 of the second lens L2 at the optical axis, and R7 is the radius of curvature of the object side surface 41 of the fourth lens L4 at the optical axis. , R8 is the curvature radius of the image side surface 42 of the fourth lens L4 at the optical axis, R9 is the curvature radius of the object side surface 51 of the fifth lens L5 at the optical axis, R10 is the curvature radius of the image side surface 52 of the fifth lens L5 at the optical axis, R11 is the curvature radius of the object side surface 61 of the sixth lens L6 at the optical axis, R12 is the curvature radius of the image side surface 62 of the sixth lens L6 at the optical axis, R13 is the curvature radius of the object side surface 71 of the seventh lens L7 at the optical axis, and R14 is the curvature radius of the image side surface 72 of the seventh lens L7 at the optical axis.

[0108] By reasonably matching the ratio of the curvature radii of the object side and the image side of each lens at the optical axis, the surface shape differences of each lens can be reasonably set, which is beneficial to controlling the shape of each lens, correcting the aberrations generated by itself, and improving the imaging quality.

[0109] In one embodiment, the optical lens 100 satisfies the relationship 0.8≤R3 / (R4+CT2)≤1.8, R3 is the radius of curvature of the object side surface 21 of the second lens L2 at the optical axis, and R4 is the radius of curvature of the image side surface 22 of the second lens L2 at the optical axis. The curvature radii of the object side surface 21 and the image side surface 22 of the second lens L2 are reasonably matched so that the cross-sectional shape of the second lens L2 parallel to the optical axis is close to a concentric arc ring, which is beneficial to a smooth transition of the light trend, and is beneficial to reducing the front port diameter of the optical lens 100, reducing the lens volume, and is beneficial to miniaturizing the optical lens 100 and reducing the manufacturing cost.

[0110] In one embodiment, the optical lens 100 satisfies the relationship 8≤|F / F56|≤85, where F56 is the focal length of the combined lens formed by the fifth lens L5 and the sixth lens L6. Reasonable matching of the focal length of the cemented lens is beneficial to correcting chromatic aberration and balancing various aberrations, improving resolution, and can effectively reduce tolerance sensitivity, thereby improving the imaging quality of the optical lens 100.

[0111] In one embodiment, the optical lens 100 satisfies the relationship 7≤|TTL / (CT5+CT6)|≤11. Properly increasing the center thickness of the bonded lens within a certain range is beneficial to enhancing its light control capability, which is beneficial to controlling more light to enter the rear system and improving relative illumination.

[0112] In one embodiment, the optical lens 100 satisfies the relationship |(Vd5-Vd6) / F56|≤2.5mm -1 , Vd5 is the Abbe number of the fifth lens L5, Vd6 is the Abbe number of the sixth lens L6, and a reasonable setting of the ratio of the difference in the Abbe numbers of the fifth lens L5 and the sixth lens L6 to the focal length of the combined lens composed of the fifth lens L5 and the sixth lens L6 can effectively correct the chromatic aberration of the optical lens 100, restore the authenticity of colors, and improve the imaging quality.

[0113] In one embodiment, the optical lens 100 satisfies the relationship 0.95≤CT7 / ET7≤1.6, CT7 is the thickness of the seventh lens L7 on the optical axis, and ET7 is the distance from the maximum effective aperture of the object side surface 71 of the seventh lens L7 to the maximum effective aperture of the image side surface 72 of the seventh lens L7 in the optical axis direction. By satisfying the above relationship, the thickness ratio of the seventh lens L7 can be reasonably controlled, thereby optimizing the surface shape of the seventh lens L7, facilitating the effective convergence of large-angle incident light, and making the light passing through the seventh lens L7 have a smaller deflection angle, thereby reducing the generation of stray light, thereby ensuring good imaging performance.

[0114] In one embodiment, the optical lens 100 satisfies the relationship 7≤|TTL / (SD14 / SAGS14)|≤20, SD14 is half of the maximum effective aperture of the image side surface 72 of the seventh lens L7, and SAGS14 is the distance from the intersection of the image side surface 72 of the seventh lens L7 and the optical axis to the maximum effective aperture of the image side surface of the seventh lens L7 on the optical axis. Satisfying the above relationship can optimize the surface shape of the image side surface of the seventh lens L7, which is beneficial to the assembly of the optical lens 100.

[0115] In one implementation, the optical lens 100 satisfies the relationship 3≤F7 / F≤12, where F7 is the focal length of the seventh lens L7. By reasonably allocating the focal length of the seventh lens L7, it is beneficial to correct the aberration of the optical lens 100 and improve the imaging quality.

[0116] In one embodiment, the optical lens 100 further satisfies the relationship -1.8≤F1 / F≤-1.5, -35≤F2 / F≤-10, 3.3≤F3 / F≤5.6, 2.7≤F4 / F≤6.5, 1.4≤F5 / F≤2.1, -2.5≤F6 / F≤-1.0, wherein F is the focal length of the optical lens 100, F1 is the focal length of the first lens, F2 is the focal length of the second lens L2, F3 is the focal length of the third lens L3, F4 is the focal length of the fourth lens L4, F5 is the focal length of the fifth lens L5, and F6 is the focal length of the sixth lens L6. By satisfying the above formulas, the optical power distribution can be uniform and reasonable, the aberration is easy to correct, and the image quality is good.

[0117] In one embodiment, the optical lens 100 satisfies the relationship 31mm≤TTL*IMGH / F≤35mm, which enables the optical lens 100 to meet the requirements of a large target surface while satisfying the requirements of adapting the optical lens 100 to a large-size imaging surface and miniaturizing the optical lens 100.

[0118] In one embodiment, the optical lens 100 satisfies the relationship 0.3≤∑CT / ∑AT≤2.1, where ∑CT is the sum of the thicknesses of all lenses from the first lens L1 to the seventh lens L7 on the optical axis, and ∑AT is the sum of the air intervals between two adjacent lenses from the first lens L1 to the seventh lens L7. By satisfying the above relationship and reasonably controlling the ratio of the sum of the thicknesses of all lenses on the optical axis to the sum of the air intervals between two adjacent lenses from the first lens L1 to the seventh lens L7, the overall structure of the optical lens 100 is made more compact, which is beneficial to shortening the total length of the optical lens 100, thereby realizing miniaturization of the optical lens 100.

[0119] In one embodiment, the optical lens 100 satisfies the relationship 5.0≤F2 / F1≤20, where F1 is the focal length of the first lens L1. By controlling the ratio range of the effective focal lengths of the first lens L1 and the second lens L2, the focal lengths of the two adjacent lenses are controlled within a reasonable range, which is beneficial to balancing the field curvature.

[0120] In one embodiment, the optical lens 100 satisfies the relationship 0.3≤CT1 / ET1≤0.4, where ET1 is the distance from the maximum effective aperture of the object side surface 11 of the first lens L1 to the maximum effective aperture of the image side surface 12 of the first lens L1 in the optical axis direction. By satisfying this relationship, the temperature drift of the optical lens 100 during imaging can be balanced.

[0121] In one embodiment, the optical lens 100 satisfies the relationship 2.5≤CT5 / ET5≤4.0, where ET5 is the distance from the maximum effective aperture of the object side surface 51 of the fifth lens L5 to the maximum effective aperture of the image side surface 52 of the fifth lens L5 in the optical axis direction. Satisfying the above relationship is conducive to the manufacture of the optical lens 100, and can reduce the angle between the main light and the optical axis when it is incident on the imaging surface 101, thereby improving the relative illumination of the imaging surface 101.

[0122] In one embodiment, the optical lens 100 satisfies the relationship 1.6≤FNO≤1.7, where FNO is the aperture number of the optical lens 100. By constraining the aperture number of the optical lens 100, the large aperture required by the optical lens 100 can be met, and the amount of light entering can be increased, so that the illumination of the optical lens 100 is high, so that it has good imaging quality in darker environments such as at night or on rainy days, and meets the requirements of large aperture and high resolution.

[0123] Example 1

[0124] Figure 1This is a schematic diagram of the structure of an optical lens 100 disclosed in Example 1 of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter 110, and a protective glass 120, which are arranged in sequence from the object side to the image side along the optical axis. Among them, the object side surface 11 of the first lens L1 is a convex surface at the near optical axis, and the image side surface 12 of the first lens L1 is a concave surface at the near optical axis; the object side surface 21 of the second lens L2 is a concave surface at the near optical axis, and the image side surface 22 of the second lens L2 is a convex surface at the near optical axis; the object side surface 31 of the third lens L3 is a convex surface at the near optical axis, and the image side surface 32 of the third lens L3 is a convex surface at the near optical axis; the object side surface 41 of the fourth lens L4 is a convex surface at the near optical axis. The image side surface 42 of the fourth lens L4 is convex at the near optical axis; the object side surface 51 of the fifth lens L5 is convex at the near optical axis, and the image side surface 52 of the fifth lens L5 is convex at the near optical axis; the object side surface 61 of the sixth lens L6 is concave at the near optical axis, and the image side surface 62 of the sixth lens L6 is concave at the near optical axis; the object side surface 71 of the seventh lens L7 is convex at the near optical axis, and the image side surface 72 of the seventh lens L7 is concave at the near optical axis.

[0125] Specifically, taking the focal length F=4.20mm of the optical lens 100, the aperture number FNO=1.64 of the optical lens 100, and the maximum field of view FOV=140° of the optical lens 100 as an example, other parameters of the optical lens 100 are given in the following Table 1. Among them, the elements from the object side to the image side along the optical axis of the optical lens 100 are arranged in the order of the elements from top to bottom in Table 1. In the same lens, the surface with a smaller surface number is the object side surface of the lens, and the surface with a larger surface number is the image side surface of the lens, such as surface numbers 1 and 2 correspond to the object side surface 11 and the image side surface 12 of the first lens L1, respectively. The Y radius in Table 1 is the radius of curvature of the object side surface or the image side surface of the corresponding surface number at the optical axis. The first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis, and the second value is the distance from the image side surface of the lens to the next surface on the optical axis. The value of the aperture 102 in the "Thickness" parameter column is the distance from the aperture 102 to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis) on the optical axis. By default, the direction from the object side of the first lens L1 to the image side of the last lens is the positive direction of the optical axis. When the value is negative, it indicates that the aperture 102 is set on the image side of the next surface vertex. If the thickness of the aperture 102 is a positive value, the aperture 102 is on the object side of the next surface vertex. It can be understood that the units of the Y radius, thickness, and focal length in Table 1 are all mm. And the refractive index, Abbe number, etc. in Table 1 are all obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 546nm.

[0126] Table 1

[0127]

[0128] In Embodiment 1, both the object-side surface 71 and the image-side surface 72 of the seventh lens L7 are aspherical surfaces. The surface shape x of the aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0129]

[0130] Among them, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the curvature of the aspheric surface at the optical axis, c=1 / Y (that is, the paraxial curvature c is the reciprocal of the curvature radius Y in Table 1 above); K is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 2 gives the high-order coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspheric surfaces of the first lens L1, the third lens L3, and the seventh lens L7.

[0131] Table 2

[0132]

[0133] Figure 2 It is the spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical lens 100 disclosed in Example 1 of the present application. Figure 2 (A) is a spherical aberration diagram of the optical lens 100 at wavelengths of 656nm, 588nm, 546nm, 486nm, and 436nm. The horizontal axis along the X-axis direction represents the focus offset in mm, and the vertical axis along the Y-axis direction represents the normalized field of view. Figure 2 As can be seen from (A) in the figure, the spherical aberration value of the optical lens 100 in Example 1 is better, which means that the imaging quality of the optical lens 100 in this embodiment is better.

[0134] Figure 2 (B) is the astigmatism diagram of the optical lens 100 in Example 1 at a wavelength of 546 nm. The horizontal axis along the X-axis direction represents the focus offset in mm, and the vertical axis along the Y-axis direction represents the field angle in degrees. T in the astigmatism diagram represents the curvature of the imaging surface 101 in the meridian direction, and S represents the curvature of the imaging surface 101 in the sagittal direction. Figure 2 As can be seen from (B) in the figure, at this wavelength, the field curvature of the optical lens 100 is small, the field curvature and astigmatism of each field of view are well corrected, and the center and edge of the field of view have clear images, that is, the astigmatism of the optical lens 100 is well compensated.

[0135] Figure 2(C) is a distortion diagram of the optical lens 100 in Example 1 at a wavelength of 546 nm. The horizontal axis along the X-axis direction represents the distortion, and the vertical axis along the Y-axis direction represents the field of view angle, in degrees. Figure 2 As can be seen from (C) in FIG. 1 , at this wavelength, the image deformation caused by the main light beam is small, and the distortion of the optical lens 100 is well corrected.

[0136] Example 2

[0137] Figure 3 This is a schematic diagram of the structure of the optical lens 100 disclosed in Example 2 of the present application. Specifically, taking the focal length F=4.10mm of the optical lens 100, the aperture number FNO=1.64 of the optical lens 100, and the maximum field angle FOV=140° of the optical lens 100 as an example, other parameters of the optical lens 100 are given in the following Table 3. The definition of each parameter can be derived from the description of the aforementioned embodiment and will not be repeated here. The refractive index, Abbe number, etc. in Table 2 are all obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 546nm. In addition, regarding the correspondence between the serial numbers of each surface of each lens and the object side and image side of each lens, please refer to the aforementioned Example 1, which will not be repeated here.

[0138] Table 3

[0139]

[0140] Table 4 gives the high-order coefficients of the various aspherical mirror surfaces of the seventh lens L7 that can be used in Example 2, wherein the surface shapes of the various aspherical surfaces can be defined by the formulas given in Example 1.

[0141] Table 4

[0142]

[0143] See also Figure 4 ,Depend on Figure 4 It can be seen from the spherical aberration diagram (A), the light astigmatism diagram (B), and the distortion diagram (C) in FIG. 1 that the spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 4 (A) Figure 4 (B) and Figure 4 The wavelengths corresponding to the curves in (C) can be referred to in Example 1. Figure 2 (A) Figure 2 (B) Figure 2 The contents described in (C) will not be repeated here.

[0144] Example 3

[0145] Figure 5 This is a schematic diagram of the structure of the optical lens 100 disclosed in Example 3 of the present application. Specifically, taking the focal length F=3.92mm of the optical lens 100, the aperture number FNO=1.65 of the optical lens 100, and the maximum field of view FOV=150° of the optical lens 100 as an example, other parameters of the optical lens 100 are given in the following Table 5. The definition of each parameter can be derived from the description of the aforementioned embodiment and will not be repeated here. The refractive index, Abbe number, etc. in Table 2 are all obtained at a reference wavelength of 587.5618nm, and the focal length is obtained at a reference wavelength of 546nm. In addition, regarding the correspondence between the serial numbers of each lens and the object side and image side of each lens, please refer to the aforementioned Example 1, which will not be repeated here.

[0146] Table 5

[0147]

[0148]

[0149] Table 6 gives the high-order coefficients of each aspherical mirror surface of the seventh lens L7 that can be used in Example 3, wherein the surface shape of each aspherical surface can be defined by the formula given in Example 1.

[0150] Table 6

[0151]

[0152] See also Figure 6 ,Depend on Figure 6 It can be seen from the spherical aberration diagram (A), the light astigmatism diagram (B), and the distortion diagram (C) in FIG. 1 that the spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 6 (A) Figure 6 (B) and Figure 6 The wavelengths corresponding to the curves in (C) can be referred to in Example 1. Figure 2 (A) Figure 2 (B) Figure 2 The contents described in (C) will not be repeated here.

[0153] Example 4

[0154] Figure 7This is a schematic diagram of the structure of the optical lens 100 disclosed in Example 4 of the present application. Specifically, taking the focal length F=4.22mm of the optical lens 100, the aperture number FNO=1.64 of the optical lens 100, and the maximum field of view FOV=160° of the optical lens 100 as an example, other parameters of the optical lens 100 are given in the following Table 7. The definition of each parameter can be derived from the description of the aforementioned embodiment and will not be repeated here. The refractive index, Abbe number, etc. in Table 7 are all obtained at a reference wavelength of 587.5618nm, and the focal length is obtained at a reference wavelength of 546nm. In addition, regarding the correspondence between the serial numbers of each lens and the object side and image side of each lens, please refer to the aforementioned Example 1, which will not be repeated here.

[0155] Table 7

[0156]

[0157]

[0158] Table 8 gives the high-order coefficients of each aspherical mirror surface of the seventh lens L7 that can be used in Example 4, wherein the surface shape of each aspherical surface can be defined by the formula given in Example 1.

[0159] Table 8

[0160]

[0161] See also Figure 8 ,Depend on Figure 8 It can be seen from the spherical aberration diagram (A), the light astigmatism diagram (B), and the distortion diagram (C) in FIG. 1 that the spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 8 (A) Figure 8 (B) and Figure 8 The wavelengths corresponding to the curves in (C) can be referred to in Example 1. Figure 2 (A) Figure 2 (B) Figure 2 The contents described in (C) will not be repeated here.

[0162] Example 5

[0163] Fig. 9This is a schematic diagram of the structure of the optical lens 100 disclosed in Example 5 of the present application. Specifically, taking the focal length F=4.51mm of the optical lens 100, the aperture number FNO=1.64 of the optical lens 100, and the maximum field of view FOV=130° of the optical lens 100 as an example, other parameters of the optical lens 100 are given in the following Table 9. The definition of each parameter can be derived from the description of the aforementioned embodiment and will not be repeated here. The refractive index, Abbe number, etc. in Table 9 are all obtained at a reference wavelength of 587.5618nm, and the focal length is obtained at a reference wavelength of 546nm. In addition, regarding the correspondence between the serial numbers of each lens and the object side and image side of each lens, please refer to the aforementioned Example 1, which will not be repeated here.

[0164] Table 9

[0165]

[0166]

[0167] Table 10 gives the high-order coefficients of the various aspherical mirror surfaces of the seventh lens L7 that can be used in Example 5, wherein the surface shapes of the various aspherical surfaces can be defined by the formulas given in Example 1.

[0168] Table 10

[0169]

[0170] See also Fig.10 ,Depend on Fig.10 It can be seen from the spherical aberration diagram (A), the light astigmatism diagram (B), and the distortion diagram (C) in FIG. 1 that the spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 8 (A) Figure 8 (B) and Figure 8 The wavelengths corresponding to the curves in (C) can be referred to in Example 1. Figure 2 (A) Figure 2 (B) Figure 2 The contents described in (C) will not be repeated here.

[0171] Please refer to Table 11, which is a summary of the ratios of various relationship equations in the first to fifth embodiments of the present application.

[0172] Table 11

[0173]

[0174]

[0175] See also Fig.11The present application also discloses a camera module 200, which includes an image sensor 201 and an optical lens 100 as described in any one of the above embodiments 1 to 5, wherein the image sensor 201 is arranged on the image side of the optical lens 100. Specifically, the photosensitive surface of the image sensor 201 is located on the imaging surface 101 of the optical lens 100, and the light of the object incident on the photosensitive surface through the lens can be converted into an electrical signal of the image. The image sensor 201 can be a complementary metal oxide semiconductor (CMOS) or a charge coupled device (CCD). The camera module 200 can be an imaging module integrated on the terminal device 300, or it can be an independent lens. It can be understood that the camera module 200 with the above optical lens 100 has all the technical effects of the above optical lens 100, that is, the camera module 200 can meet the requirements of a large field of view, high relative illumination and a miniaturized design. Since the above technical effects have been described in detail in the embodiment of the optical lens 100, they will not be described again here.

[0176] The present application also discloses a terminal device 300, which includes a housing 301 and the camera module 200, wherein the camera module 200 is disposed in the housing 301. The terminal device 300 may include but is not limited to a mobile phone, a tablet computer, a laptop computer, a smart watch, a vehicle-mounted device, a drone, a monitor, etc. Fig.12 Taking the terminal device 300 as a vehicle as an example, the shell 301 can be a vehicle body, and the camera module 200 can be set on the vehicle body, for example, inside the vehicle body or outside the vehicle body.

[0177] It can be understood that the terminal device 300 having the above-mentioned camera module 200 also has all the technical effects of the above-mentioned optical lens 100. That is, the terminal device 300 can meet the requirements of large field of view, high relative illumination and miniaturization design. Since the above-mentioned technical effects have been described in detail in the embodiment of the optical lens 100, they will not be repeated here.

[0178] The optical lens, camera module and terminal device disclosed in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the optical lens, camera module and terminal device of the present application and its core idea; at the same time, for general technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An optical lens, characterized in that: There are seven lenses with refractive power, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in sequence from the object side to the image side along the optical axis; The first lens has negative refractive power, the object side surface of the first lens is convex at the near optical axis, and the image side surface of the first lens is concave at the near optical axis; The second lens has negative refractive power, the object side surface of the second lens is concave at the near optical axis, and the image side surface of the second lens is convex at the near optical axis; The third lens has positive refractive power, and the object side surface and the image side surface of the third lens are both convex surfaces at the near optical axis; The fourth lens has positive refractive power, and the object side surface and the image side surface of the fourth lens are both convex surfaces near the optical axis; The fifth lens has positive refractive power, and the object side surface and the image side surface of the fifth lens are both convex surfaces near the optical axis; The sixth lens has negative refractive power, and the object side surface and the image side surface of the sixth lens are both concave surfaces near the optical axis; The seventh lens has positive refractive power, the object side surface of the seventh lens is convex at the near optical axis, and the image side surface of the seventh lens is concave at the near optical axis; The optical lens satisfies the following relationship: 130°≤FOV≤160° and -7.5≤R6 / F3≤-3.0; Among them, FOV is the maximum field of view of the optical lens, FNO is the aperture number of the optical lens, R6 is the radius of curvature of the image side of the third lens at the optical axis, and F3 is the focal length of the third lens.

2. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relationship: 6.8≤TTL / F≤7.7, and / or, 79°≤FOV / FNO≤98°, and / or, 7.5≤TTL / BFL≤9.9; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, F is the focal length of the optical lens, and BFL is the distance from the image side of the seventh lens to the imaging surface of the optical lens on the optical axis.

3. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relationship: 0.19≤SD1 / TTL≤0.23, and / or, 1.3≤SD1 / IMGH≤1.55, and / or, 6.5≤TTL / IMGH≤6.8; Among them, SD1 is the maximum effective semi-aperture of the object side of the first lens, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, and IMGH is half of the image height corresponding to the maximum field of view angle of the optical lens.

4. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relationship: 0.65≤CT12 / (CT1+CT2)≤0.95, and / or, 1.9≤CT5 / CT6≤4, and / or, -30≤F2 / CT2≤-9; Among them, CT12 is the distance from the image side surface of the first lens to the object side surface of the second lens on the optical axis, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, F2 is the focal length of the second lens, CT5 is the thickness of the fifth lens on the optical axis, and CT6 is the thickness of the sixth lens on the optical axis.

5. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relationship: 5≤R1 / R2≤20, and / or, 0.8≤R3 / (R4+CT2)≤1.8, and / or, -0.3≤R5 / R6≤0; Among them, R1 is the curvature radius of the object side of the first lens at the optical axis, R2 is the curvature radius of the image side of the first lens at the optical axis, R3 is the curvature radius of the object side of the second lens at the optical axis, R4 is the curvature radius of the image side of the second lens at the optical axis, CT2 is the thickness of the second lens on the optical axis, and R5 is the curvature radius of the object side of the third lens at the optical axis.

6. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relationship: 8≤|F / F56|≤85, and / or, 7≤|TTL / (CT5+CT6)|≤11, and / or,|(Vd5-Vd6) / F56|≤2.5mm -1 ; Wherein, F is the focal length of the optical lens, F56 is the combined focal length of the fifth lens and the sixth lens, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, Vd5 is the Abbe number of the fifth lens, and Vd6 is the Abbe number of the sixth lens.

7. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relationship: 0.95≤CT7 / ET7≤1.6, and / or, 7≤|TTL / (SD14 / SAGS14)|≤20, and / or, 3≤F7 / F≤12; Among them, CT7 is the thickness of the seventh lens on the optical axis, ET7 is the distance from the maximum effective aperture of the object side surface of the seventh lens to the maximum effective aperture of the image side surface of the seventh lens in the direction of the optical axis, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, SD14 is the maximum effective semi-aperture of the image side surface of the seventh lens, SAGS14 is the distance from the intersection of the image side surface of the seventh lens and the optical axis to the maximum effective aperture of the image side surface of the seventh lens on the optical axis, F7 is the focal length of the seventh lens, and F is the focal length of the optical lens.

8. The optical lens according to claim 1, characterized in that: The optical lens satisfies the following relationship: 31mm≤TTL*IMGH / F≤35mm, and / or, 0.3≤∑CT / ∑AT≤2.1, and / or, 1≤SD4 / SD3≤1.25; Wherein, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, IMGH is half of the image height corresponding to the maximum field angle of the optical lens, F is the focal length of the optical lens, ∑CT is the sum of the thicknesses of all lenses from the first lens to the seventh lens on the optical axis, ∑AT is the sum of the air intervals between two adjacent lenses from the first lens to the seventh lens, SD3 is the maximum effective semi-aperture of the object side surface of the second lens, and SD4 is the maximum effective semi-aperture of the image side surface of the second lens.

9. A camera module, characterized in that: The camera module includes an image sensor and an optical lens as described in any one of claims 1 to 8, and the image sensor is arranged on the image side of the optical lens.

10. A terminal device, characterized in that: It comprises a shell and a camera module as claimed in claim 9, wherein the camera module is arranged in the shell.

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