Optical lens, camera module and terminal device

Abstract

The application 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 thereof are respectively convex and concave near the optical axis. The second lens has negative refractive power, and the object side surface and the image side surface thereof are respectively concave and convex near the optical axis. The third lens has positive refractive power, and the object side surface and the image side surface thereof are both convex near the optical axis. The fourth lens has positive refractive power, and the object side surface and the image side surface thereof are both convex near the optical axis. The fifth lens has positive refractive power, and the object side surface and the image side surface thereof are both convex near the optical axis. The sixth lens has negative refractive power, and the object side surface and the image side surface thereof are both concave near the optical axis. The seventh lens has positive refractive power, and the object side surface and the image side surface thereof are respectively convex and concave near the optical axis. The optical lens satisfies the following relationship: 130°≤FOV≤160° and -7.5≤R6 / F3≤-3.0.

Description

TECHNICAL FIELD

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

[0002] With the continuous development of the automotive industry, the demand for vehicle-mounted lenses is increasing. In traffic safety monitoring, automatic driving assistance and other application scenarios, the lens needs to cover a wider field of view to obtain more road information. Among them, optical lenses can be widely used in vehicle-mounted reversing vision systems, dash cams, automatic parking and panoramic parking systems, road navigation systems, etc.

[0003] The vehicle-mounted lens is a key component for the automatic driving assistance system to obtain external information. With the rapid development of the automatic driving assistance system, the performance requirements for front-view optical lenses are becoming higher and higher. However, traditional vehicle-mounted lenses have limitations in terms of image size and field of view, and cannot meet the requirements of large-scene monitoring in complex traffic environments. Moreover, a small field of view may lead to a monitoring blind area, which poses a potential threat to driving safety. Therefore, there is a need in the market for an optical lens with a large field of view, a high image plane and small distortion to meet the front-view application of automobiles. SUMMARY

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

[0005] 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 order along the optical axis from the object side to the image side.

[0006] The first lens has negative refractive power, and 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, and 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 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 at the near 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 at the near optical axis.

[0011] The sixth lens has negative refractive power, and both object side surface and image side surface of the sixth lens are concave at the near 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] Wherein, 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 surface 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 negative 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, so that the first lens is formed in a shape of convex moon towards the object side, which can effectively collect incident light rays of a large field of view, and realize the maximum field of view FOV>70° of the fixed focus lens. The second lens has negative refractive power, and the object side surface is concave at the near optical axis, which can preliminarily correct the astigmatism of the optical lens and effectively control the trend of light rays. The third lens has positive refractive power, and both the object side surface and the image side surface are convex at the near optical axis, which can effectively collect and compress the incident light rays on the object side, so that the light rays smoothly transition to the optical lens on the image side. The fourth lens has positive refractive power, and the object side surface is convex at the near optical axis and the image side surface is convex at the near optical axis, which is conducive to reducing the incident angle of light rays after passing through the diaphragm, so that more light rays enter the optical lens on the image side, thereby improving the illumination of the optical lens. The fifth lens has positive refractive power, and both 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. Meanwhile, the positive refractive power of the fifth lens is also conducive to converging light rays and reducing the total length of the optical lens. The sixth lens has negative refractive power, and both the object side surface and the image side surface are concave at the near optical axis, which, in combination with the positive refractive power of the fifth lens, is helpful to eliminate chromatic aberration, correct astigmatism, improve resolution, and slow down the deflection angle of light rays 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, which can converge light rays and reduce the total length of the optical lens, thereby further realizing the miniaturization design of the optical lens.

[0017] The optical lens satisfies the relationship 130°≤FOV≤160°, and by reasonably setting the maximum field of view of the optical lens, sufficient field of view can be provided for the optical lens to meet the requirement of large field of view 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 improve the relative illumination and imaging quality of the optical lens.

[0019] As an optional implementation, in the 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 realizing the miniaturization of the optical lens, improving the resolution, reducing the sensitivity of the lens, and also enabling the optical lens to have a wide-angle characteristic.

[0023] The optical lens satisfies the relationship 79°≤FOV / FNO≤98°, which controls the relationship between the field of view and the aperture number of the optical lens, provides a reasonable field of view and aperture number for the optical lens, takes into account the design difficulty and the demand for the field of view, and changes the aperture within a reasonable range to provide a combination effect of a large field of view and a large aperture, so that the optical lens has the characteristics of a large aperture, high relative illumination, and small distortion.

[0024] The optical lens satisfies the relationship 7.5≤TTL / BFL≤9.9, which controls the distance from the image side of the seventh lens to the imaging surface of the optical lens on the optical axis, and is conducive to realizing the miniaturization design of the optical lens.

[0025] As an optional implementation, in the 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] wherein SD1 is the maximum effective half 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 a relationship of 0.19≤SD1 / TTL≤0.23, by controlling a 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 realize miniaturization.

[0029] The optical lens satisfies a relationship of 1.3≤SD1 / IMGH≤1.55, by reasonably controlling the size of the maximum effective aperture of the object side of the first lens, the miniaturization design of the optical lens is facilitated.

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

[0031] As an optional implementation, in the embodiment of the first aspect of the 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] Wherein, CT12 is the distance on the optical axis from the image side of the first lens to the object side of the second lens, 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 a relationship of 0.65≤CT12 / (CT1+CT2)≤0.95, by reasonably controlling the ratio of the distance on the optical axis between the first lens and the second lens to the sum of the thicknesses on the optical axis of the first lens and the second lens, the total length of the optical lens is shortened, and the structure of the optical lens is more compact.

[0035] The optical lens satisfies a relationship of 1.9≤CT5 / CT6≤4, by reasonably controlling the thickness ratio of the fifth lens and the sixth lens on the optical axis, the light is gently passed through the cemented lens formed by the fifth lens and the sixth lens, and the aberration is reduced.

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

[0037] As an optional implementation, in the 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] wherein R1 is the radius of curvature of the object side surface of the first lens at the optical axis, R2 is the radius of curvature of the image side surface of the first lens at the optical axis, R3 is the radius of curvature of the object side surface of the second lens at the optical axis, R4 is the radius of curvature of the image side surface of the second lens at the optical axis, CT2 is the thickness of the second lens on the optical axis, and R5 is the radius of curvature of the object side surface of the third lens at the optical axis.

[0040] The optical lens satisfies the relationship 5≤R1 / R2≤20, which reasonably matches the ratio between the radii of curvature of the object side surface and the image side surface of the first lens, so that the difference between the surface shapes of the first lens is reasonably set, which is conducive to controlling the shape of the first lens, correcting the aberration generated by itself, and improving the imaging quality. In addition, it is also conducive to the molding of the first lens, reducing the processing difficulty.

[0041] The optical lens satisfies the relationship 0.8≤R3 / (R4+CT2)≤1.8, which reasonably matches the radii of curvature of the object side surface and the image side surface of the second lens, so that the shape of the second lens is close to a concentric circular arc ring, which is conducive to the smooth transition of the light rays and is conducive to reducing the front aperture of the optical lens, reducing the size of the lens, and realizing the miniaturization of the lens and reducing the manufacturing cost.

[0042] The optical lens satisfies the relationship -0.3≤R5 / R6≤0, which reasonably sets the radii of curvature of the object side surface and the image side surface of the third lens, which can effectively collect and compress the incident light rays after being refracted by the first lens and the second lens, so that the light rays are smoothly transitioned to the rear optical lens, reducing the aberration and improving the imaging quality of the optical lens.

[0043] As an optional implementation, in the 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] Wherein, 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 on the optical axis from the object side of the first lens to the imaging surface of the optical lens, 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, which is reasonable to match the focal length of the cemented lens, is beneficial to correct chromatic aberration and balance various aberrations, improves resolution, and can effectively reduce the tolerance sensitivity and improve the imaging quality of the optical lens.

[0047] The optical lens satisfies the relationship 7≤|TTL / (CT5+CT6)|≤11, which is reasonable to appropriately increase the center thickness of the cemented lens, is beneficial to enhance the light regulation ability, is beneficial to regulate more light into the rear system, and improves the relative luminance.

[0048] The optical lens satisfies the relationship |(Vd5-Vd6) / F56|≤2.5mm -1 , which is reasonable to set the Abbe number difference of the fifth lens and the sixth lens and the ratio of the combined focal length of the fifth lens and the sixth lens, can effectively correct the chromatic aberration of the optical lens, restore the authenticity of the color, and improve the imaging quality.

[0049] As an optional implementation, in the embodiment of the first aspect of the 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] Wherein, CT7 is the thickness of the seventh lens on the optical axis, ET7 is the distance in the direction of the optical axis from the maximum effective aperture of the object side of the seventh lens to the maximum effective aperture of the image side of the seventh lens, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical lens, SD14 is the maximum effective half aperture of the image side of the seventh lens, SAGS14 is the distance on the optical axis from the intersection of the image side of the seventh lens and the optical axis to the maximum effective aperture of the image side of the seventh lens, F7 is the focal length of the seventh lens, and F is the focal length of the optical lens.

[0052] The optical lens satisfies a relationship 0.95≤CT7 / ET7≤1.6, the thickness-to-thinness ratio of the seventh lens can be reasonably controlled, the face shape of the seventh lens is optimized, the effective convergence of the large-angle incident light is facilitated, and the light passing through the seventh lens has a small deflection angle, so that the generation of stray light is reduced, and good imaging performance is ensured.

[0053] The optical lens satisfies a relationship 7≤|TTL / (SD14 / SAGS14)|≤20, the face shape of the image side of the seventh lens is optimized, and the assembly of the optical lens is facilitated.

[0054] The optical lens satisfies a relationship 3≤F7 / F≤12, the focal length of the seventh lens is reasonably distributed, the aberration of the optical lens is corrected, and the imaging quality is improved.

[0055] As an optional implementation, in the embodiment of the first aspect of the 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 on the optical axis from the object side of the first lens to the imaging surface of the optical lens, IMGH is half of the image height corresponding to the maximum field of view 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 gaps between adjacent two lenses from the first lens to the seventh lens, SD3 is the maximum effective half aperture of the object side of the second lens, and SD4 is the maximum effective half aperture of the image side of the second lens.

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

[0059] The optical lens satisfies a relationship 0.3≤∑CT / ∑AT≤2.1, the ratio of the sum of the thicknesses of all lenses on the optical axis to the sum of the air gaps between adjacent two lenses from the first lens to the seventh lens is reasonably controlled, the overall structure of the optical lens is more compact, the total length of the optical lens is shortened, and the miniaturization of the optical lens is realized.

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

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

[0062] In a third aspect, the present application discloses a terminal device, comprising a housing and the camera module mentioned above, wherein the camera module is arranged on the housing.

[0063] Compared with the prior art, the present application has the following beneficial effects:

[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 small size design, the first lens has negative refractive power, the object side surface is convex at the near optical axis, the image side surface is concave at the near optical axis, and the convex surface is crescent-shaped towards the object side, which can effectively collect incident light rays of a large field of view, realizing a maximum field of view FOV>70° of the fixed focus lens. The second lens has negative refractive power, and the object side surface is concave at the near optical axis, which can preliminarily correct the astigmatism of the optical lens, effectively control the trend of light rays, and realize a larger aperture. The third lens L3 has positive refractive power, and the object side surface is convex at the near optical axis, and the image side surface can be convex at the near optical axis, which can effectively collect and compress the incident light rays on the object side, so that the light rays smoothly transition to the optical lens on the image side. The fourth lens L4 has positive refractive power, the object side surface is convex, and the image side surface is convex, which is conducive to reducing the incident angle of light rays after passing through the diaphragm, so that more light rays enter the optical lens on the image side, improving the illumination of the optical lens. The fifth lens has positive refractive power, and the object side surface and the image side surface are both convex at the near optical axis, which is conducive to reducing the chromatic aberration of the optical lens. At the same time, the positive refractive power of the fifth lens is also conducive to converging light rays 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 both concave at the near optical axis, which, in combination with the positive refractive power of the fifth lens, helps to eliminate chromatic aberration, correct astigmatism, improve resolution, and slow down the deflection angle of light rays, reducing 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, which can converge light rays, reduce the total length of the optical lens, and further realize the small size 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, sufficient field of view can be provided for the optical lens to meet the requirement of large field of view of the optical lens.

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

[0067] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0068] Figure 1 is a structural schematic diagram of an optical lens disclosed by Embodiment 1 of the present application;

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

[0070] Figure 3 is a structural schematic diagram of an optical lens disclosed by Embodiment 2 of the present application;

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

[0072] Figure 5 is a structural schematic diagram of an optical lens disclosed by Embodiment 3 of the present application;

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

[0074] Figure 7 is a structural schematic diagram of an optical lens disclosed by Embodiment 4 of the present application;

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

[0076] Figure 9 is a structural schematic diagram of an optical lens disclosed by Embodiment 5 of the present application;

[0077] Figure 10 is a spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical lens disclosed by Embodiment 5 of the present application;

[0078] Figure 11 is a structural schematic diagram of a camera module disclosed by the present application;

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

[0080] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0081] In the present application, the terms "upper", "front", "rear", "top", "inner", "outer", "middle" and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0082] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meaning of these terms in the present application can be understood according to the specific situation.

[0083] In addition, the term "set" should be understood broadly. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific situation.

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

[0085] Although some optical lenses applied to automobiles are proposed in the related art, the optical lenses in the related art have some problems. For example, the optical lenses in the related art cannot simultaneously meet the requirements of high resolution and miniaturization; the optical lenses in the related art can reach the clarity of megapixels, but the chromatic aberration, astigmatism, distortion and other aberration problems are more serious; the optical lenses in the related art have poor light transmission capability and cannot adapt to the relatively dark environment at night or in rainy days; the optical lenses in the related art cannot simultaneously meet the requirements of small front aperture and miniaturization; the optical lenses in the related art cannot simultaneously meet the requirements of large aperture and high resolution.

[0086] The technical solutions of the present application will be further described below with reference to the embodiments and the accompanying drawings.

[0087] Please refer to Figure 1 The present application discloses an optical lens 100, which comprises 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 arranged in sequence along the optical axis from the object side to the image side. Among them, the first lens L1 has negative refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has positive refractive power, the sixth lens L6 has negative refractive power, and the seventh lens L7 has positive refractive power. During imaging, light rays enter 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 image on the imaging surface 101 of the optical lens 100.

[0088] Further, the object side surface 11 of the first lens L1 is convex at the near optical axis, 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, 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, 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 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, 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, 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 the lenses in the optical lens 100 can be made of glass, or all the lenses can be made of plastic, or some lenses are made of glass and some lenses are made of plastic. Preferably, all the lenses in the optical lens 100 are made of glass. The lenses made of glass can inhibit the shift of the back focus of the optical lens 100 caused by the change of temperature, so as to improve the stability of the optical lens 100. At the same time, using glass can avoid the imaging blur of the optical lens 100 caused by the change of high and low temperature 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 thus improve the imaging quality of the optical lens 100.

[0091] In some embodiments, the optical lens 100 further comprises a stop 102, which can be an aperture stop and / or a field stop, and which can be arranged between the image side 32 of the third lens L3 and the object side 41 of the fourth lens L4 of the optical lens 100. It can be understood that in other embodiments, the stop 102 can also be arranged between other lenses, and the arrangement can be adjusted according to the actual situation, which is not limited in the present embodiment.

[0092] In some embodiments, the optical lens 100 further comprises a filter 110, which can be arranged between the image side 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 arranged between other lenses, and the arrangement can be adjusted according to the actual situation, which is not limited in the present embodiment. In the present embodiment, the filter 110 can be an infrared cut-off filter, so as to filter out light of other wavebands such as infrared light, and only allow visible light 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 be an infrared band-pass filter, so as to filter out light of other wavebands such as visible light, and only allow infrared light to pass through. By filtering out light of other wavebands such as visible light, the imaging quality is improved, and the optical lens 100 can be used as an infrared optical lens 100, i.e., the optical lens 100 can image and obtain good image effects in dim environments and other special application scenarios. Preferably, the filter 110 can be made of glass, of course, in other embodiments, the filter 110 can also be made of optical glass coating, or other materials, which can be selected according to the actual needs, which are not limited in the present embodiment.

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

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

[0095] In an embodiment, the optical lens 100 satisfies the relationship -7.5≤R6 / F3≤-3.0, where R6 is the curvature radius 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 miniaturized design of the optical lens 100, and improve the relative illumination and imaging quality of the optical lens 100.

[0096] In an 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. This can reasonably control the total length of the optical lens 100 and the focal length of the optical lens 100, 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 realizing the miniaturization of the optical lens 100, improving the resolution, and reducing the sensitivity of the lens.

[0097] In an embodiment, the optical lens 100 satisfies the relationship 79°≤FOV / FNO≤98°. By reasonably controlling the relationship between the field of view angle FOV and the aperture number FNO of the optical lens 100, a reasonable field of view angle and aperture number are provided for the optical lens 100, which can take into account the design difficulty and the field of view angle requirement, and at the same time, the aperture changes within a reasonable range, providing a combination effect of large field of view angle and large aperture, and meeting the characteristics of the optical lens 100 having a large aperture, high relative illumination, and small distortion.

[0098] In an 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, the miniaturized design of the optical lens 100 can be realized.

[0099] In an 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 11 of the first lens L1, by controlling the ratio of half of the maximum effective aperture of the object side 11 of the first lens L1 SD1 to the total optical length TTL of the optical lens 100, the size and volume of the head of the lens can be limited to achieve miniaturization.

[0100] In an 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, by reasonably controlling the size of the maximum effective aperture of the object side 11 of the first lens L1, it is beneficial to realize the miniaturization design of the optical lens 100.

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

[0102] In an embodiment, the optical lens 100 satisfies the relationship 0.65≤CT12 / (CT1+CT2)≤0.95, 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, CT12 is the distance between the image side 12 of the first lens L1 and the object side 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 thickness of the first lens L1 and the second lens L2 on the optical axis, it is beneficial to shorten the total length of the optical lens 100, and make the structure of the optical lens 100 more compact.

[0103] In an 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, 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 the light pass through the cemented lens gently and reduce aberration.

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

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

[0106] In an embodiment, the optical lens 100 satisfies the relationship -0.3≤R5 / R6≤0, R5 is the radius of curvature of the object side surface 31 of the third lens L3 at the optical axis, and R6 is the radius of curvature of the image side surface 32 of the third lens L3 at the optical axis. Reasonably setting the radii of curvature of the object side surface 31 and the image side surface 32 of the third lens L3 can effectively collect and compress the incident light rays after being refracted by the first lens L1 and the second lens L2, so that the light rays smoothly transition into the rear optical lens 100, reduce aberration, and improve the imaging quality of the optical lens 100.

[0107] In an 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, and 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, R7 is the radius of curvature of the object side surface 41 of the fourth lens L4 at the optical axis, R8 is the radius of curvature of the image side surface 42 of the fourth lens L4 at the optical axis, R9 is the radius of curvature of the object side surface 51 of the fifth lens L5 at the optical axis, R10 is the radius of curvature of the image side surface 52 of the fifth lens L5 at the optical axis, R11 is the radius of curvature of the object side surface 61 of the sixth lens L6 at the optical axis, R12 is the radius of curvature of the image side surface 62 of the sixth lens L6 at the optical axis, R13 is the radius of curvature of the object side surface 71 of the seventh lens L7 at the optical axis, and R14 is the radius of curvature of the image side surface 72 of the seventh lens L7 at the optical axis.

[0108] By reasonably matching the ratio between the radii of curvature of the object side surface and the image side surface of each lens at the optical axis, the difference between the surface shapes of each lens is reasonably set, which is beneficial to control the shape of each lens, correct the aberration generated by itself, and improve the imaging quality.

[0109] In an embodiment, the optical lens 100 satisfies a relationship of 0.8≤R3 / (R4+CT2)≤1.8, R3 is the curvature radius of the object side 21 of the second lens L2 at the optical axis, R4 is the curvature radius of the image side 22 of the second lens L2 at the optical axis, and the curvature radii of the object side 21 and the image side 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 conducive to smooth transition of light rays and conducive to reducing the front aperture of the optical lens 100, reducing the size of the lens, and conducive to miniaturization of the optical lens 100 and reducing manufacturing costs.

[0110] In an embodiment, the optical lens 100 satisfies a relationship of 8≤|F / F56|≤85, F56 is the focal length of the combined lens composed of the fifth lens L5 and the sixth lens L6, and the focal length of the cemented lens is reasonably matched, which is conducive to correcting chromatic aberration and balancing various aberrations, improving resolution, and effectively reducing tolerance sensitivity, thereby improving the imaging quality of the optical lens 100.

[0111] In an embodiment, the optical lens 100 satisfies a relationship of 7≤|TTL / (CT5+CT6)|≤11, and the central thickness of the cemented lens is appropriately increased within a certain range, which is conducive to enhancing its light regulation capability and regulating more light into the rear system to improve relative luminance.

[0112] In an embodiment, the optical lens 100 satisfies a relationship of |(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 the ratio of the Abbe number difference between 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 is reasonably set, which can effectively correct the chromatic aberration of the optical lens 100, restore the authenticity of colors, and improve the imaging quality.

[0113] In an embodiment, the optical lens 100 satisfies a relationship of 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 71 of the seventh lens L7 to the maximum effective aperture of the image side 72 of the seventh lens L7 in the direction of the optical axis. Satisfying the above relationship can reasonably control the thickness ratio of the seventh lens L7, thereby optimizing the face shape of the seventh lens L7, which is conducive to effective convergence of large-angle incident light and makes the light passing through the seventh lens L7 have a smaller deflection angle, thereby reducing the generation of stray light and ensuring good imaging performance.

[0114] In an embodiment, the optical lens 100 satisfies a relationship 7≤|TTL / (SD14 / SAGS14)|≤20, SD14 is half of the maximum effective aperture of the image side 72 of the seventh lens L7, and SAGS14 is the distance from the intersection of the image side 72 of the seventh lens L7 and the optical axis to the maximum effective aperture of the image side of the seventh lens L7 on the optical axis. By satisfying the above relationship, the face type of the image side of the seventh lens L7 can be optimized, which is beneficial to the assembly of the optical lens 100.

[0115] In an embodiment, the optical lens 100 satisfies a relationship 3≤F7 / F≤12, F7 is the focal length of the seventh lens L7. By reasonably distributing the focal length of the seventh lens L7, the aberration of the optical lens 100 can be corrected, and the imaging quality can be improved.

[0116] In an embodiment, the optical lens 100 further satisfies relationships -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 formula, the power distribution can be uniform and reasonable, the aberration can be easily corrected, and the image quality can be good.

[0117] In an embodiment, the optical lens 100 satisfies a relationship 31mm≤TTL*IMGH / F≤35mm, which can make the optical lens 100 meet the requirement of a large target surface while meeting the requirements of large imaging surface and miniaturization of the optical lens 100.

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

[0119] In an embodiment, the optical lens 100 satisfies a relationship 5.0≤F2 / F1≤20, F1 is a focal length of the first lens L1, by controlling the range of the ratio 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 in a reasonable range, which is conducive to balancing the field curvature.

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

[0121] In an embodiment, the optical lens 100 satisfies a relationship 2.5≤CT5 / ET5≤4.0, ET5 is a distance in the optical axis direction from a maximum effective aperture of the object side surface 51 of the fifth lens L5 to a maximum effective aperture of the image side surface 52 of the fifth lens L5. By satisfying the relationship, the manufacturing of the optical lens 100 is facilitated, and the angle of the chief ray to the optical axis when the chief ray is incident on the imaging surface 101 is reduced, thereby improving the relative luminance of the imaging surface 101.

[0122] In an embodiment, the optical lens 100 satisfies a relationship 1.6≤FNO≤1.7, FNO is an aperture number of the optical lens 100. By restricting the aperture number of the optical lens 100, the large aperture required by the optical lens 100 can be met, the light amount is improved, the luminance of the optical lens 100 is high, and the optical lens 100 has good imaging quality in dark environments such as night or rainy days, thereby meeting the requirements of large aperture and high resolution.

[0123] Embodiment 1

[0124] Figure 1A structural schematic of the optical lens 100 disclosed in Embodiment 1 of the present application, the optical lens 100 comprises, in sequence from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a diaphragm 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. Among them, 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 at the near optical axis, and 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 of the optical lens 100 as 4.20 mm, the F number FNO of the optical lens 100 as 1.64, and the maximum field of view FOV of the optical lens 100 as 140° as examples, other parameters of the optical lens 100 are given in Table 1 below. Among them, the elements along the optical axis of the optical lens 100 are arranged in the order of the elements from top to bottom in Table 1 from the object side to the image side. In the same lens, the surface with a smaller surface serial number is the object side surface of the lens, and the surface with a larger surface serial number is the image side surface of the lens, such as the surface serial numbers 1 and 2 corresponding 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 with the corresponding surface serial number at the optical axis. The first value in the “thickness” parameter column of the lens is the thickness of the lens at the optical axis, and the second value is the distance from the image side surface of the lens to the vertex of the next surface at the optical axis. The value in the “thickness” parameter column of the diaphragm 102 is the distance from the vertex of the diaphragm 102 to the vertex of the next surface at the optical axis, and the positive direction of the optical axis is by default from the object side surface of the first lens L1 to the image side surface of the last lens. When the value is negative, it indicates that the diaphragm 102 is arranged on the image side of the vertex of the next surface. If the thickness of the diaphragm 102 is positive, the diaphragm 102 is on the object side of the vertex of the next surface. It can be understood that the units of the Y radius, thickness and focal length in Table 1 are mm. The refractive index, Abbe number and the like in Table 1 are obtained at a reference wavelength of 587.6 nm, and the focal length is obtained at a reference wavelength of 546 nm.

[0126] Table 1

[0127]

[0128] In Example 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 is not limited to, the following aspherical surface formula:

[0129]

[0130] Where x is the distance from the aspheric surface's vertex to the aspheric surface at a height h along the optical axis; c is the curvature of the aspheric surface at the optical axis, c = 1 / Y (i.e., the paraxial curvature c is the reciprocal of the curvature radius Y in Table 1 above); K is the conic coefficient; Ai is the correction factor for the i-th order of the aspheric surface. Table 2 below lists 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 1 and 2 are 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 the spherical aberration diagram of the optical lens 100 at wavelengths of 656nm, 588nm, 546nm, 486nm, and 436nm. The horizontal axis along the X-axis represents the focus offset in mm, and the vertical axis along the Y-axis 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 represents the focus offset in mm, and the vertical axis along the Y-axis represents the field angle in degrees. In the astigmatism diagram, T represents the curvature of the imaging surface 101 in the meridional 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 the distortion diagram of the optical lens 100 in Example 1 at a wavelength of 546 nm. The horizontal axis along the X-axis represents the distortion, and the vertical axis along the Y-axis 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 structural diagram 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 lens and the object side and image side of each lens, please refer to the aforementioned Example 1 and will not be repeated here.

[0138] Table 3

[0139]

[0140] Table 4 lists the high-order coefficients of the various aspherical 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 As can be seen from the (A) spherical aberration diagram, (B) light astigmatism diagram, and (C) distortion diagram, the spherical aberration, astigmatism, and distortion of the optical lens 100 are all 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 structural diagram of the optical lens 100 disclosed in Example 3 of the present application. Specifically, taking the focal length F = 3.92 mm, the aperture number FNO = 1.65, and the maximum field angle 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 587.5618 nm, and the focal length is obtained at a reference wavelength of 546 nm. 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 and will not be repeated here.

[0146] Table 5

[0147]

[0148]

[0149] Table 6 lists the high-order coefficients of the various aspherical surfaces of the seventh lens L7 that can be used in Example 3, wherein the surface shapes of the various aspherical surfaces can be defined by the formulas given in Example 1.

[0150] Table 6

[0151]

[0152] See also Figure 6 ,Depend on Figure 6 As can be seen from the (A) spherical aberration diagram, (B) light astigmatism diagram, and (C) distortion diagram, the spherical aberration, astigmatism, and distortion of the optical lens 100 are all 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 7The structural diagram of optical lens 100 disclosed by Embodiment 4 of the present application is shown in Table 7 below, specifically, taking the focal length F of optical lens 100 as 4.22 mm, the F number FNO of optical lens 100 as 1.64, the maximum field angle FOV of optical lens 100 as 160° as examples, other parameters of optical lens 100 are given in Table 7 below. And the definition of each parameter can be obtained from the description of the foregoing embodiments, which will not be repeated here. And the refractive index, Abbe number and the like in Table 7 are obtained at the reference wavelength of 587.5618 nm, and the focal length is obtained at the reference wavelength of 546 nm. In addition, for the correspondence between the surface number of each lens and the object side surface and the image side surface of each lens, please refer to the description of Embodiment 1, which will not be repeated here.

[0155] Table 7

[0156]

[0157]

[0158] Table 8 gives the high-order term coefficients of each aspherical surface of the seventh lens L7 in Embodiment 4, wherein each aspherical surface type can be defined by the formula given in Embodiment 1.

[0159] Table 8

[0160]

[0161] Please refer to Figure 8 , the (A) spherical aberration diagram, (B) ray astigmatism diagram and (C) distortion diagram in Figure 8 , it can be seen that the spherical aberration, astigmatism and distortion of optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, the wavelengths corresponding to each curve in (A) of Figure 8 , (B) of Figure 8 and (C) of Figure 8 can refer to the description of (A) of Figure 2 , (B) of Figure 2 , (C) of Figure 2 in Embodiment 1, which will not be repeated here.

[0162] Embodiment 5

[0163] Figure 9This is a schematic structural diagram 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 angle 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 and will not be repeated here.

[0164] Table 9

[0165]

[0166]

[0167] Table 10 lists the high-order coefficients of the various aspherical 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 Figure 10 ,Depend on Figure 10 As can be seen from the (A) spherical aberration diagram, (B) light astigmatism diagram, and (C) distortion diagram, the spherical aberration, astigmatism, and distortion of the optical lens 100 are all 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 summarizes the ratios of various relationship equations in the first to fifth embodiments of the present application.

[0172] Table 11

[0173]

[0174]

[0175] See also Figure 11The application further discloses a camera module 200, which comprises an image sensor 201 and the optical lens 100 as described in any one of the above embodiments 1 to 5, and 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 at the imaging surface 101 of the optical lens 100, and the light rays of an object incident on the photosensitive surface through the lens can be converted into an image electrical signal. 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 a terminal device 300, or can be a separate 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 small size design. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they will not be described here.

[0176] The application further discloses a terminal device 300, which comprises a housing 301 and the above camera module 200, and the camera module 200 is arranged on the housing 301. The terminal device 300 can include but is not limited to a mobile phone, a tablet computer, a notebook computer, a smart watch, a vehicle-mounted device, a drone, a monitor and the like. Please refer to Figure 12 Taking the terminal device 300 as a vehicle for example, the housing 301 can be a vehicle body, and the camera module 200 can be arranged on the vehicle body, for example, can be arranged inside or outside the vehicle body.

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

[0178] The optical lens, the camera module and the terminal device disclosed in the embodiments of the application are described in detail above, and the principles and implementation modes of the application are described by applying specific examples; the above embodiment descriptions are only used to help understand the optical lens, the camera module and the terminal device and the core ideas thereof; meanwhile, for those skilled in the art, the specific implementation modes and application ranges will be changed according to the ideas of the application; in conclusion, the content of the specification should not be understood as a limitation of the 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 both the object-side surface and the image-side surface of the third lens are convex near the optical axis; The fourth lens has positive refractive power, and both the object-side surface and the image-side surface of the fourth lens are convex near the optical axis; The fifth lens element has positive refractive power, and both the object-side surface and the image-side surface of the fifth lens element are convex near the optical axis; The sixth lens element has negative refractive power, and both the object-side surface and the image-side surface of the sixth lens element are concave near the optical axis; The seventh lens element has positive refractive power, the object-side surface of the seventh lens element is convex near the optical axis, and the image-side surface of the seventh lens element is concave near the optical axis; The optical lens satisfies the following relationship: 130°≤FOV≤160°; -7.5≤R6 / F3≤-3.0; 6.8≤TTL / F≤7.7; as well as 1.6≤FNO≤1.7; 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 surface of the third lens at the optical axis, F3 is the focal length of the third 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, and F is the focal length of the optical lens.

2. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: 79°≤FOV / FNO≤98°, and / or, 7.5≤TTL / BFL≤9.9; Wherein, BFL is the distance from the image side surface of the seventh lens to the imaging surface of the optical lens on the optical axis.

3. The optical lens according to claim 1, wherein: 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; Wherein, 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, wherein: 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; Wherein, CT12 is the distance on the optical axis from the image side surface of the first lens to the object side surface of the second lens, 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, wherein: 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; Wherein, R1 is the radius of curvature of the object side surface of the first lens at the optical axis, R2 is the radius of curvature of the image side surface of the first lens at the optical axis, R3 is the radius of curvature of the object side surface of the second lens at the optical axis, R4 is the radius of curvature of the image side surface of the second lens at the optical axis, CT2 is the thickness of the second lens on the optical axis, and R5 is the radius of curvature of the object side surface of the third lens at the optical axis.

6. The optical lens according to claim 1, wherein: 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, wherein: 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, wherein: 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 the image height corresponding to the maximum field of view 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 spaces 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 the optical lens according to 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 the camera module as claimed in claim 9, wherein the camera module is arranged in the shell.

Images