Optical systems, lens modules and electronic devices

Abstract

An optical system, a lens module and an electronic device. The optical system comprises a first lens to a seventh lens in order from the object side to the image side along the optical axis direction. The first lens, the third lens and the sixth lens have positive refractive power, the second lens and the seventh lens have negative refractive power, the object side surfaces of the second lens, the third lens and the sixth lens in the near optical axis region are all convex surfaces, and the image side surfaces of the second lens and the seventh lens in the near optical axis region are all concave surfaces; the image side surface of the near circumference region of the third lens is a convex surface; the object side surface of the near optical axis region of the seventh lens is a convex surface, at least one of the object side surface and the image side surface of the fifth lens, the sixth lens and the seventh lens is provided with at least one inflection point, and by setting a seven-piece lens structure, the refractive power and the surface shape of the seven optical lenses are reasonably configured, so that the optical system can meet the requirements of large wide angle and miniaturization of the system while meeting the requirements of high pixel.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical imaging, and in particular relates to an optical system, a lens module and an electronic device. Background Art

[0002] With the development of science and technology and the popularization of smart electronic devices such as smartphones, devices with diversified camera functions have been widely favored by people, especially wide-angle cameras. At present, wide-angle lenses are mostly ordinary wide-angle lenses less than 84°. The size of the object space captured is very different from the visual angle of the human eye, and the scenes covered in daily use are limited. For wide-angle lenses exceeding 100°, the size of the object space that can be accommodated under limited shooting conditions is about 1.6 times that of the original 84°. With the blessing of high pixels and high image quality, more scenes can be covered for daily use. In addition, wide-angle lenses with large imaging areas can allow more screen cropping in video recording, obtaining better video shooting stability. Therefore, wide-angle lenses with higher image quality are needed to meet the development trend of high-pixel and ultra-thin optical lens groups. Summary of the invention

[0003] The object of the present invention is to provide an optical system, a lens module and an electronic device that can solve the above problems.

[0004] To achieve the purpose of the present invention, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides an optical system, which comprises, in order from the object side to the image side along the optical axis direction: a first lens having positive refractive power, wherein both the object side surface and the image side surface of the first lens are aspherical surfaces; a second lens having negative refractive power, wherein the object side surface of the second lens in the near optical axis region is convex, and the image side surface of the second lens in the near optical axis region is concave; a third lens having positive refractive power, wherein the object side surface of the third lens in the near optical axis region is convex, and the image side surface of the third lens in the near circumferential region is convex; a fourth lens having refractive power, wherein both the object side surface and the image side surface of the fourth lens are aspherical surfaces; a fifth lens having refractive power, wherein both the object side surface and the image side surface of the fifth lens are aspherical surfaces. The surfaces of the lens are all aspherical, and at least one of the object side surface and the image side surface of the fifth lens is provided with at least one inflection point; the sixth lens has positive refractive power, the object side surface of the sixth lens in the near optical axis area is convex, the object side surface and the image side surface of the sixth lens are both aspherical, and at least one of the object side surface and the image side surface of the sixth lens is provided with at least one inflection point; the seventh lens has negative refractive power, the object side surface of the seventh lens in the near optical axis area is convex, the image side surface of the seventh lens in the near optical axis area is concave, the object side surface and the image side surface of the seventh lens are both aspherical, and at least one of the object side surface and the image side surface of the seventh lens is provided with at least one inflection point.

[0006] By setting up a seven-lens structure and rationally configuring the refractive power and surface shape of the seven optical lenses, the optical system can meet the requirements of high pixel density, wide angle and miniaturization of the system.

[0007] In one embodiment, the optical system satisfies the condition: 101.0≤FOV≤105.0; wherein FOV is the maximum field of view of the optical system. The maximum field of view FOV is greater than 90°, and more scenes can be covered.

[0008] In one embodiment, the optical system satisfies the conditional formula: 1.10<TTL / ImgH<1.45; wherein TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, and ImgH is half the diagonal length of the effective imaging area on the imaging plane. ImgH determines the size of the electronic photosensitive chip. The larger the ImgH, the larger the maximum supported electronic photosensitive chip size and the higher the pixel support. The reduction of TTL compresses the length of the entire optical system, making it easy to achieve ultra-thinness and miniaturization. Satisfying the above formula allows the optical system to support high-pixel electronic photosensitive chips while compressing the length of the optical system. A small-sized optical system can accommodate large-sized photosensitive chips.

[0009] In one embodiment, the optical system satisfies the conditional formula: 19.00<FOV / TTL≤25.00; wherein TTL is the distance from the object side of the first lens to the imaging surface on the optical axis. The maximum field of view FOV of this embodiment is greater than 100°, which is a wide-angle lens. At the same imaging distance, it can accommodate more objects and can be applied to electronic devices such as smartphones for a wider range of usage scenarios; satisfying the above formula can allow a small-sized lens group to have a larger field of view.

[0010] In one embodiment, the optical system satisfies the conditional formula: |HDIS / f|<1.45; wherein HDIS is the TV distortion value of the optical system in the horizontal direction, and f is the effective focal length of the optical system. TV distortion is a measure of the visual distortion of an image and is an important indicator for evaluating the imaging quality of an optical system. The unit of TV distortion value is %. When the maximum field of view FOV of the optical system exceeds 100°, the imaging is prone to form a large distortion. However, through the reasonable use of aspherical surfaces, while satisfying the above formula, the overall distortion is compressed and controlled within an appropriate range, thereby ensuring the imaging quality of a large field of view.

[0011] In one embodiment, the optical system satisfies the conditional formula: 5.00<(|f4|+|f5|) / f<423.00; wherein f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical system. The fifth lens provides a portion of the positive or negative refractive power to adjust the overall refractive power of the optical system; the combination of the fourth lens and the fifth lens reduces the incident angle of light with a large field of view in the lens, which helps to reduce the tolerance sensitivity of the optical system; at the same time, it has a significant improvement effect on the primary aberration of the front lens group composed of several lenses close to the object side of the optical system, and a reasonable refractive power configuration can achieve higher image quality.

[0012] In one embodiment, the optical system satisfies the conditional formula: |SAG71 / R72|<0.50; wherein SAG71 is the maximum sagittal height in the axial direction of the object side of the seventh lens, and R72 is the radius of curvature at the optical axis of the image side of the seventh lens. The object side and the image side of the seventh lens contain at least one inflection point, and the maximum sagittal height change in the axial direction perpendicular to the optical axis direction makes the vertical refractive power distribution reasonable, and eliminates the distortion and field curvature generated by the front lens group composed of several lenses close to the object side to the greatest extent, thereby improving the image quality.

[0013] In one embodiment, the optical system satisfies the conditional formula: 1.60<(CT1+CT2+CT3) / BFL<2.90; wherein CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, and BFL is the closest distance of the image side surface of the seventh lens to the imaging surface in the direction parallel to the optical axis. Reasonable back focal length ensures the matching of the lens group and the electronic photosensitive chip. The combination of positive, negative and positive refractive power of the first three lenses (first lens, second lens and third lens) achieves better achromatic and spherical aberration effects. Satisfying the above formula can keep the thickness of the first lens, the second lens and the third lens on the optical axis appropriate, effectively improving the compactness of the lens structure, reducing the length of the optical system, and facilitating lens molding and assembly.

[0014] In one embodiment, the optical system satisfies the conditional formula: 0.30<(SAG52+SAG61) / (ET5+CT6)<1.20; wherein SAG52 is the maximum sag of the image side of the fifth lens in the axial direction, SAG61 is the maximum sag of the object side of the sixth lens in the axial direction, ET5 is the thickness of the fifth lens at the maximum optical effective diameter, and CT6 is the thickness of the sixth lens on the optical axis. Satisfying the above formula, the change in the aspheric sag of the fifth lens and the sixth lens is conducive to correcting the aberrations generated by the optical system at a large field angle and improving the image quality; on the other hand, the aspheric matching of the lens reduces the light deflection angle, which is conducive to reducing sensitivity. Reasonable control of the middle thickness (thickness on the optical axis) and the edge thickness (thickness on the circumference) can reduce the overall length of the optical system and the risk of molding.

[0015] In one embodiment, the optical system satisfies the condition: (f3+|f4|) / (R31+|R41|)<12.00;

[0016] Wherein, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, R31 is the radius of curvature at the optical axis of the object side of the third lens, and R41 is the radius of curvature at the optical axis of the object side of the fourth lens. If the above formula is satisfied, the radius of curvature of the third lens and the fourth lens will not be too large, and at the same time, the primary aberration introduced is small, which is conducive to the correction of the overall aberration by the subsequent aspheric lens. The reasonable refractive power and curvature radius configuration of the third lens and the fourth lens helps to reduce the difficulty of molding and assembly.

[0017] In a second aspect, the present invention further provides a lens module, which includes the optical system described in any one of the embodiments of the first aspect. By adding the optical system provided by the present invention to the lens module, the lens module has the effects of wide angle, high pixel and miniaturization.

[0018] In a third aspect, the present invention further provides an electronic device, the electronic device comprising a housing and the lens module according to the second aspect, wherein the lens module is arranged in the housing. By adding the lens module provided by the present invention to the electronic device, the electronic device has the effects of high pixel, wide angle and miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1ais a schematic structural diagram of the optical system of the first embodiment;

[0021] Figure 1b 7 are the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the first embodiment;

[0022] Figure 2a is a schematic structural diagram of an optical system of a second embodiment;

[0023] Figure 2b 7 are the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the second embodiment;

[0024] Figure 3a is a schematic structural diagram of an optical system of a third embodiment;

[0025] Figure 3b 7 are the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the third embodiment;

[0026] Figure 4a is a schematic structural diagram of an optical system of a fourth embodiment;

[0027] Figure 4b 7 are the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the fourth embodiment;

[0028] Figure 5a is a schematic structural diagram of an optical system of a fifth embodiment;

[0029] Figure 5b 1 and 2 are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the fifth embodiment.

[0030] Figure 6a is a schematic structural diagram of an optical system of a sixth embodiment;

[0031] Figure 6b 7 are the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the sixth embodiment;

[0032] Figure 7a is a schematic structural diagram of an optical system of a seventh embodiment;

[0033] Figure 7b 1 and 2 are the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the seventh embodiment. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The embodiment of the present invention provides a lens module, which includes a lens barrel and an optical system provided by the embodiment of the present invention, wherein the first lens to the seventh lens of the optical system are installed in the lens barrel. The lens module can be an independent lens of a digital camera, or an imaging module integrated in an electronic device such as a smart phone. By adding the optical system provided by the present invention to the lens module, the lens module has the effects of wide angle, high pixel and miniaturization.

[0036] An embodiment of the present invention provides an electronic device, which includes a housing and a lens module provided by an embodiment of the present invention, and the lens module is arranged in the housing. Further, the electronic device may also include an electronic photosensitive element, the photosensitive surface of the electronic photosensitive element is located on the imaging surface of the optical system, and the light of the object incident on the photosensitive surface of the electronic photosensitive element through the first lens to the seventh lens can be converted into an electrical signal of the image. The electronic photosensitive element can be a complementary metal oxide semiconductor (CMOS) or a charge-coupled device (CCD). The electronic device can be a smart phone, a personal digital assistant (PDA), a tablet computer, a smart watch, a drone, an e-book reader, a driving recorder, a wearable device, etc. By adding the lens module provided by the present invention to the electronic device, the electronic device has the effects of high pixel, wide angle and miniaturization.

[0037] The optical system provided by the embodiment of the present invention comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in order from the object side to the image side along the optical axis direction. Among the first lens to the seventh lens, any two adjacent lenses may have an air gap between them.

[0038] Specifically, the specific shapes and structures of the seven lenses are as follows: the first lens has positive refractive power, and the object side surface and the image side surface of the first lens are both aspherical surfaces; the second lens has negative refractive power, the object side surface of the second lens near the optical axis region is convex, and the image side surface of the second lens near the optical axis region is concave; the third lens has positive refractive power, the object side surface of the third lens near the optical axis region is convex, and the image side surface of the third lens near the circumference region is convex; the fourth lens has refractive power, and the object side surface and the image side surface of the fourth lens are both aspherical surfaces; the fifth lens has refractive power, and the object side surface and the image side surface of the fifth lens are both aspherical surfaces , at least one of the object side surface and the image side surface of the fifth lens is provided with at least one inflection point; the sixth lens has positive refractive power, the object side surface of the sixth lens in the near optical axis region is convex, the object side surface and the image side surface of the sixth lens are both aspherical surfaces, and at least one of the object side surface and the image side surface of the sixth lens is provided with at least one inflection point; the seventh lens has negative refractive power, the object side surface of the seventh lens in the near optical axis region is convex, the image side surface of the seventh lens in the near optical axis region is concave, the object side surface and the image side surface of the seventh lens are both aspherical surfaces, and at least one of the object side surface and the image side surface of the seventh lens is provided with at least one inflection point.

[0039] The optical system further includes an aperture stop, which can be arranged at any position between the first lens to the seventh lens, such as being arranged on the object side of the first lens.

[0040] By setting up a seven-lens structure and rationally configuring the refractive power and surface shape of the seven optical lenses, the optical system can meet the requirements of high pixel density, wide angle and miniaturization of the system.

[0041] An infrared cut-off filter may also be provided between the seventh lens and the imaging surface to transmit the visible light band and cut off the infrared light band, thereby avoiding interference from non-working light bands and causing false colors or ripples, and at the same time improving effective resolution and color reproduction.

[0042] In one implementation, the optical system satisfies the condition: 101.0≤FOV≤105.0, wherein FOV is the maximum field of view of the optical system. The maximum field of view FOV is greater than 90°, and more scenes can be covered.

[0043] In one embodiment, the optical system satisfies the conditional formula: 1.10<TTL / ImgH<1.45; wherein TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, and ImgH is half the diagonal length of the effective imaging area on the imaging plane, that is, the half image height. ImgH determines the size of the electronic photosensitive chip. The larger the ImgH, the larger the maximum supported electronic photosensitive chip size and the higher the pixel support. The reduction of TTL compresses the length of the entire optical system, making it easy to achieve ultra-thinness and miniaturization. Satisfying the above formula allows the optical system to support high-pixel electronic photosensitive chips while compressing the length of the optical system. A small-sized optical system can accommodate large-sized photosensitive chips.

[0044] In one embodiment, the optical system satisfies the conditional formula: 19.00<FOV / TTL≤25.00; wherein FOV is the maximum field of view of the optical system, and TTL is the distance from the object side of the first lens to the imaging surface on the optical axis. The maximum field of view FOV of this embodiment is greater than 100°, which is a wide-angle lens. At the same imaging distance, it can accommodate more objects and can be applied to electronic devices such as smart phones for a wider range of use scenarios; satisfying the above formula can allow a small-sized lens group to have a larger field of view.

[0045] In one embodiment, the optical system satisfies the conditional formula: |HDIS / f|<1.45; wherein HDIS is the TV distortion value of the optical system in the horizontal direction, and f is the effective focal length of the optical system. TV distortion is a measure of the visual distortion of an image and is an important indicator used to evaluate the imaging quality of an optical system. The unit of TV distortion value is %. When the maximum field of view FOV of the optical system exceeds 100°, the imaging is prone to form a large distortion. However, through the reasonable use of aspherical surfaces, the overall distortion is compressed and controlled within an appropriate range while satisfying the above formula, thereby ensuring the imaging quality of a large field of view.

[0046] In one embodiment, the optical system satisfies the conditional formula: 5.00<(|f4|+|f5|) / f<423.00; wherein f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical system. The fifth lens provides a portion of the positive or negative refractive power to adjust the overall refractive power of the optical system; the fourth lens and the fifth lens combination reduce the incident angle of the light with a large field of view in the lens, which helps to reduce the tolerance sensitivity of the optical system; at the same time, the primary aberration of the front lens group composed of several lenses close to the object side of the optical system is significantly improved, and a reasonable refractive power configuration can achieve higher image quality.

[0047] In one embodiment, the optical system satisfies the conditional formula: |SAG71 / R72|<0.50; wherein SAG71 is the maximum sagittal height in the axial direction of the object side of the seventh lens, and R72 is the radius of curvature at the optical axis of the image side of the seventh lens. The object side and the image side of the seventh lens contain at least one inflection point, and the maximum sagittal height change in the axial direction perpendicular to the optical axis direction allows a reasonable distribution of vertical refractive power, and eliminates the distortion and field curvature generated by the front lens group composed of several lenses close to the object side to the greatest extent, thereby improving image quality.

[0048] In one embodiment, the optical system satisfies the conditional formula: 1.60<(CT1+CT2+CT3) / BFL<2.90; wherein CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, and BFL is the closest distance of the image side surface of the seventh lens to the imaging surface in the direction parallel to the optical axis, i.e., the back focus. Reasonable back focus length ensures the matching of the lens group and the electronic photosensitive chip. The combination of positive, negative and positive refractive powers of the first three lenses (first lens, second lens and third lens) achieves better achromatic and spherical aberration effects. Satisfying the above formula can keep the thickness of the first lens, the second lens and the third lens on the optical axis appropriate, effectively improving the compactness of the lens structure, reducing the length of the optical system, and facilitating lens molding and assembly.

[0049] In one embodiment, the optical system satisfies the conditional formula: 0.30<(SAG52+SAG61) / (ET5+CT6)<1.20; wherein SAG52 is the maximum sag of the image side of the fifth lens in the axial direction, SAG61 is the maximum sag of the object side of the sixth lens in the axial direction, ET5 is the thickness of the fifth lens at the maximum optical effective diameter, and CT6 is the thickness of the sixth lens on the optical axis. Satisfying the above formula, the change in the aspheric sag of the fifth lens and the sixth lens is conducive to correcting the aberrations generated by the optical system at a large field angle and improving the image quality; on the other hand, the aspheric matching of the lens reduces the light deflection angle, which is conducive to reducing sensitivity. Reasonable control of the middle thickness (thickness on the optical axis) and the edge thickness (thickness on the circumference) can reduce the overall length of the optical system and the risk of molding.

[0050] In one embodiment, the optical system satisfies the conditional formula: (f3+|f4|) / (R31+|R41|)<12.00; wherein f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, R31 is the radius of curvature at the optical axis of the object side of the third lens, and R41 is the radius of curvature at the optical axis of the object side of the fourth lens. If the above formula is satisfied, the radius of curvature of the third lens and the fourth lens will not be too large, and at the same time, the primary aberration introduced is small, which is conducive to the subsequent correction of the overall aberration by the aspheric lens. The reasonable refractive power and curvature radius configuration of the third lens and the fourth lens helps to reduce the difficulty of molding and assembly.

[0051] First embodiment

[0052] Please refer to Figure 1a and Figure 1b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0053] The first lens L1 has positive refractive power, the object side surface S1 of the near optical axis region and the near circumference region of the first lens L1 are both convex surfaces, the image side surface S2 of the near optical axis region of the first lens L1 is concave, and the image side surface S2 of the near circumference region is convex;

[0054] The second lens L2 has negative refractive power. The object side surface S3 of the second lens L2 in the near optical axis region is convex, the object side surface S3 in the near circumference region is concave, and the image side surfaces S4 in the near optical axis region and the near circumference region of the second lens L2 are both concave.

[0055] The third lens L3 has positive refractive power, the object side surface S5 of the third lens L3 near the optical axis region and the near circumference region are both convex surfaces, and the image side surface S6 of the third lens L3 near the optical axis region and the near circumference region are both convex surfaces;

[0056] The fourth lens L4 has positive refractive power, the object-side surface S7 of the near optical axis region and the near circumference region of the fourth lens L4 are both concave surfaces, and the image-side surface S8 of the near optical axis region and the near circumference region of the fourth lens L4 are both convex surfaces;

[0057] The fifth lens L5 has negative refractive power, the object-side surface S9 of the fifth lens L5 near the optical axis region and near the circumference region are both convex surfaces, and the image-side surface S10 of the fifth lens L5 near the optical axis region and near the circumference region are both concave surfaces;

[0058] The sixth lens L6 has positive refractive power. At least one of the object-side surface S11 and the image-side surface S12 of the sixth lens L6 is provided with at least one inflection point. The object-side surface S11 of the sixth lens L6 in the near optical axis region and the near circumference region are both convex surfaces. The image-side surface S12 of the sixth lens L6 in the near optical axis region is concave, and the image-side surface S12 in the near circumference region is convex.

[0059] The seventh lens L7 has negative refractive power. At least one of the object-side surface S13 and the image-side surface S14 of the seventh lens L7 is provided with at least one inflection point. The object-side surface S13 of the seventh lens L7 in a near optical axis region is a convex surface, and the object-side surface S13 in a near circumferential region is a concave surface. The image-side surface S14 of the seventh lens L7 in a near optical axis region is a concave surface, and the image-side surface S14 in a near circumferential region is a convex surface.

[0060] The materials of the first lens L1 to the seventh lens L7 are all plastic.

[0061] In addition, the optical system also includes an aperture ST0, an infrared cutoff filter IR and an imaging surface IMG. The aperture STO is arranged on the object side S1 side of the first lens L1 to control the amount of light entering. In other embodiments, the aperture STO can also be arranged between two adjacent lenses, or on other lenses. The infrared cutoff filter IR is arranged between the image side S14 of the seventh lens L7 and the imaging surface IMG, which includes the object side S15 and the image side S16. The infrared cutoff filter is used to filter out infrared light so that the light incident on the imaging surface IMG is visible light, and the wavelength of visible light is 380nm-780nm. The material of the infrared cutoff filter is glass (GLASS), and a film can be coated on the glass. The effective pixel area of ​​the electronic photosensitive element is located on the imaging surface IMG.

[0062] Table 1a shows a table of characteristics of the optical system of this embodiment, wherein each data is obtained using visible light with a wavelength of 546 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0063] Table 1a

[0064]

[0065] Wherein, f is the effective focal length of the optical system, FNO is the aperture number of the optical system, FOV is the maximum field angle of the optical system, and TTL is the distance from the object side surface S1 of the first lens L1 to the imaging surface IMG on the optical axis.

[0066] In this embodiment, the object side surface and the image side surface of any lens of the first lens L1 to the seventh lens L7 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0067]

[0068] Wherein, 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 paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the Y radius R in the above Table 1a); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 1b shows the high-order coefficients A4, A6, A8, A10, A12, A14, A15, A17, A18 and A20 that can be used for each aspheric mirror surface S1-S14 in the first embodiment.

[0069] Table 1b

[0070]

[0071] Figure 1bThe longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the first embodiment are shown. The longitudinal spherical aberration curve indicates the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve indicates the curvature of the meridian imaging surface and the curvature of the sagittal imaging surface; and the distortion curve indicates the distortion magnitude value corresponding to different field angles. Figure 1b It can be seen that the optical system provided in the first embodiment can achieve good imaging quality.

[0072] Second embodiment

[0073] Please refer to Figure 2a and Figure 2b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0074] The first lens L1 has positive refractive power, the object side surface S1 of the near optical axis region and the near circumference region of the first lens L1 are both convex surfaces, and the image side surface S2 of the near optical axis region and the near circumference region of the first lens L1 are concave surfaces;

[0075] The second lens L2 has negative refractive power. The object side surface S3 of the second lens L2 in the near optical axis region is convex, and the object side surface S3 in the near circumference region is concave. The image side surface S4 of the second lens L2 in the near optical axis region is concave, and the image side surface S4 in the near circumference region is convex.

[0076] The third lens L3 has positive refractive power. The object side surface S5 of the third lens L3 in the near optical axis region is convex, the object side surface S5 in the near circumference region is concave, and the image side surfaces S6 in the near optical axis region and the near circumference region of the third lens L3 are both convex.

[0077] The fourth lens L4 has positive refractive power. The object side surfaces S7 of the fourth lens L4 in the near optical axis region and the near circumference region are both concave surfaces. The image side surface S8 of the fourth lens L4 in the near optical axis region is a convex surface, and the image side surface S8 in the near circumference region is a concave surface.

[0078] The fifth lens L5 has negative refractive power. The object side surface S9 of the fifth lens L5 in the near optical axis region is convex, and the object side surface S9 in the near circumference region is concave. The image side surface S10 of the fifth lens L5 in the near optical axis region is concave, and the image side surface S10 in the near circumference region is convex.

[0079] The sixth lens L6 has positive refractive power. At least one of the object-side surface S11 and the image-side surface S12 of the sixth lens L6 is provided with at least one inflection point. The object-side surface S11 of the sixth lens L6 in the near optical axis region is convex, and the object-side surface S11 in the near circumference region is concave. The image-side surfaces S12 of the sixth lens L6 in the near optical axis region and the near circumference region are both convex.

[0080] The seventh lens L7 has negative refractive power. At least one of the object-side surface S13 and the image-side surface S14 of the seventh lens L7 is provided with at least one inflection point. The object-side surface S13 of the seventh lens L7 in the near optical axis region and the near circumferential region are both convex surfaces, the image-side surface S14 of the seventh lens L7 in the near optical axis region is concave, and the image-side surface S14 in the near circumferential region is convex.

[0081] The other structures of the second embodiment are the same as those of the first embodiment, and can be used as a reference.

[0082] Table 2a shows a table of characteristics of the optical system of this embodiment, wherein each data is obtained using visible light with a wavelength of 546 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0083] Table 2a

[0084]

[0085]

[0086] The meanings of the parameters in Table 2a are the same as those in the first embodiment.

[0087] Table 2b gives the coefficients of the higher-order terms that can be used for each aspherical mirror surface in the second embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0088] Table 2b

[0089]

[0090] Figure 2b The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the second embodiment are shown, wherein the longitudinal spherical aberration curve indicates the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve indicates the curvature of the meridian imaging surface and the curvature of the sagittal imaging surface; and the distortion curve indicates the distortion magnitude value corresponding to different field angles. Figure 2b It can be seen that the optical system provided in the second embodiment can achieve good imaging quality.

[0091] Third embodiment

[0092] Please refer to Figure 3a and Figure 3b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0093] The first lens L1 has positive refractive power, the object side surface S1 of the near optical axis region and the near circumference region of the first lens L1 are both convex surfaces, the image side surface S2 of the near optical axis region of the first lens L1 is concave, and the image side surface S2 of the near circumference region is convex;

[0094] The second lens L2 has negative refractive power. The object side surface S3 of the second lens L2 in the near optical axis region is convex, the object side surface S3 in the near circumference region is concave, and the image side surfaces S4 in the near optical axis region and the near circumference region of the second lens L2 are both concave.

[0095] The third lens L3 has positive refractive power. The object side surface S5 of the third lens L3 in the near optical axis region is convex, the object side surface S5 in the near circumference region is concave, and the image side surfaces S6 in the near optical axis region and the near circumference region of the third lens L3 are both convex.

[0096] The fourth lens L4 has positive refractive power. The object side surfaces S7 of the fourth lens L4 in the near optical axis region and the near circumference region are both concave surfaces. The image side surface S8 of the fourth lens L4 in the near optical axis region is a convex surface, and the image side surface S8 in the near circumference region is a concave surface.

[0097] The fifth lens L5 has positive refractive power, the object side surface S9 of the fifth lens L5 in the near optical axis region is convex, the object side surface S9 in the near circumference region is concave, the image side surface S10 of the fifth lens L5 in the near optical axis region is concave, and the image side surface S10 in the near circumference region is convex;

[0098] The sixth lens L6 has positive refractive power. At least one of the object-side surface S11 and the image-side surface S12 of the sixth lens L6 is provided with at least one inflection point. The object-side surface S11 of the sixth lens L6 in the near optical axis region is convex, and the object-side surface S11 in the near circumference region is concave. The image-side surfaces S12 of the sixth lens L6 in the near optical axis region and the near circumference region are both convex.

[0099] The seventh lens L7 has negative refractive power. At least one of the object-side surface S13 and the image-side surface S14 of the seventh lens L7 is provided with at least one inflection point. The object-side surface S13 of the seventh lens L7 in a near optical axis region is a convex surface, and the object-side surface S13 in a near circumferential region is a concave surface. The image-side surface S14 of the seventh lens L7 in a near optical axis region is a concave surface, and the image-side surface S14 in a near circumferential region is a convex surface.

[0100] The other structures of the third embodiment are the same as those of the first embodiment, and can be used as a reference.

[0101] Table 3a shows a table of characteristics of the optical system of this embodiment, wherein each data is obtained using visible light with a wavelength of 546 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0102] Table 3a

[0103]

[0104] The meanings of the parameters in Table 3a are the same as those in the first embodiment.

[0105] Table 3b gives the coefficients of the higher-order terms that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0106] Table 3b

[0107]

[0108]

[0109] Figure 3b The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the third embodiment are shown, wherein the longitudinal spherical aberration curve represents the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the curvature of the meridian imaging surface and the curvature of the sagittal imaging surface; and the distortion curve represents the distortion magnitude value corresponding to different field angles. Figure 3b It can be seen that the optical system provided in the third embodiment can achieve good imaging quality.

[0110] Fourth embodiment

[0111] Please refer to Figure 4a and Figure 4b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0112] The first lens L1 has positive refractive power, the object side surface S1 of the near optical axis region and the near circumference region of the first lens L1 are both convex surfaces, the image side surface S2 of the near optical axis region of the first lens L1 is concave, and the image side surface S2 of the near circumference region is convex;

[0113] The second lens L2 has negative refractive power. The object side surface S3 of the second lens L2 in the near optical axis region is convex, and the object side surface S3 in the near circumference region is concave. The image side surface S4 of the second lens L2 in the near optical axis region is concave, and the image side surface S4 in the near circumference region is convex.

[0114] The third lens L3 has positive refractive power. The object side surface S5 of the third lens L3 in the near optical axis region is convex, the object side surface S5 in the near circumference region is concave, and the image side surfaces S6 in the near optical axis region and the near circumference region of the third lens L3 are both convex.

[0115] The fourth lens L4 has positive refractive power. The object side surfaces S7 of the fourth lens L4 in the near optical axis region and the near circumference region are both concave surfaces. The image side surface S8 of the fourth lens L4 in the near optical axis region is a convex surface, and the image side surface S8 in the near circumference region is a concave surface.

[0116] The fifth lens L5 has positive refractive power, the object side surface S9 of the fifth lens L5 in the near optical axis region is convex, the object side surface S9 in the near circumference region is concave, the image side surface S10 of the fifth lens L5 in the near optical axis region is concave, and the image side surface S10 in the near circumference region is convex;

[0117] The sixth lens L6 has positive refractive power. At least one of the object-side surface S11 and the image-side surface S12 of the sixth lens L6 is provided with at least one inflection point. The object-side surface S11 of the sixth lens L6 in the near optical axis region is convex, the object-side surface S11 in the near circumference region is concave, and the image-side surface S12 of the sixth lens L6 in the near optical axis region and the near circumference region is convex.

[0118] The seventh lens L7 has negative refractive power. At least one of the object-side surface S13 and the image-side surface S14 of the seventh lens L7 is provided with at least one inflection point. The object-side surface S13 of the seventh lens L7 in the near optical axis region and the near circumferential region are both convex surfaces, the image-side surface S14 of the seventh lens L7 in the near optical axis region is concave, and the image-side surface S14 in the near circumferential region is convex.

[0119] The other structures of the fourth embodiment are the same as those of the first embodiment, and can be referred to herein.

[0120] Table 4a shows a table of characteristics of the optical system of this embodiment, wherein each data is obtained using visible light with a wavelength of 546 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0121] Table 4a

[0122]

[0123] The meanings of the parameters in Table 4a are the same as those in the first embodiment.

[0124] Table 4b gives the coefficients of the higher-order terms that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0125] Table 4b

[0126]

[0127] Figure 4b The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fourth embodiment are shown, wherein the longitudinal spherical aberration curve represents the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the curvature of the meridian imaging surface and the curvature of the sagittal imaging surface; and the distortion curve represents the distortion magnitude value corresponding to different field angles. Figure 4b It can be seen that the optical system provided in the fourth embodiment can achieve good imaging quality.

[0128] Fifth embodiment

[0129] Please refer to Figure 5a and Figure 5b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0130] The first lens L1 has positive refractive power, the object side surface S1 of the near optical axis region and the near circumference region of the first lens L1 are both convex surfaces, the image side surface S2 of the near optical axis region of the first lens L1 is convex, and the image side surface S2 of the near circumference region is concave;

[0131] The second lens L2 has negative refractive power. The object side surface S3 of the second lens L2 in the near optical axis region is convex, and the object side surface S3 in the near circumference region is concave. The image side surface S4 of the second lens L2 in the near optical axis region is concave, and the image side surface S4 in the near circumference region is convex.

[0132] The third lens L3 has positive refractive power. The object side surface S5 of the third lens L3 in the near optical axis region is convex, and the object side surface S5 in the near circumference region is concave. The image side surface S6 of the third lens L3 in the near optical axis region is concave, and the image side surface S6 in the near circumference region is convex.

[0133] The fourth lens L4 has a positive refractive power. The object side surface S7 of the fourth lens L4 in the near optical axis region is convex, and the object side surface S7 in the near circumference region is concave. The image side surface S8 of the fourth lens L4 in the near optical axis region is convex, and the image side surface S8 in the near circumference region is concave.

[0134] The fifth lens L5 has negative refractive power. The object side surface S9 of the fifth lens L5 in the near optical axis region is convex, and the object side surface S9 in the near circumference region is concave. The image side surface S10 of the fifth lens L5 in the near optical axis region is concave, and the image side surface S10 in the near circumference region is convex.

[0135] The sixth lens L6 has positive refractive power. At least one of the object-side surface S11 and the image-side surface S12 of the sixth lens L6 is provided with at least one inflection point. The object-side surface S11 of the sixth lens L6 in the near optical axis region is convex, and the object-side surface S11 in the near circumference region is concave. The image-side surfaces S12 of the sixth lens L6 in the near optical axis region and the near circumference region are both convex.

[0136] The seventh lens L7 has negative refractive power. At least one of the object-side surface S13 and the image-side surface S14 of the seventh lens L7 is provided with at least one inflection point. The object-side surface S13 of the near optical axis region and the near circumference region of the seventh lens L7 are both convex surfaces, and the image-side surface S14 of the near optical axis region and the near circumference region of the seventh lens L7 are both concave surfaces.

[0137] The other structures of the fifth embodiment are the same as those of the first embodiment, and can be referred to herein.

[0138] Table 5a shows a table of the characteristics of the optical system of this embodiment, wherein each data is obtained using visible light with a wavelength of 546 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0139] Table 5a

[0140]

[0141]

[0142] The meanings of the parameters in Table 5a are the same as those in the first embodiment.

[0143] Table 5b gives the coefficients of the higher-order terms that can be used for each aspherical mirror surface in the fifth embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0144] Table 5b

[0145]

[0146] Figure 5b The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fifth embodiment are shown, wherein the longitudinal spherical aberration curve indicates the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve indicates the curvature of the meridian imaging surface and the curvature of the sagittal imaging surface; and the distortion curve indicates the distortion magnitude value corresponding to different field angles. Figure 5b It can be seen that the optical system provided in the fifth embodiment can achieve good imaging quality.

[0147] Sixth embodiment

[0148] Please refer to Figure 6a and Figure 6b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0149] The first lens L1 has positive refractive power, the object side surface S1 of the near optical axis region and the near circumference region of the first lens L1 are both convex surfaces, and the image side surface S2 of the near optical axis region and the near circumference region of the first lens L1 are both convex surfaces;

[0150] The second lens L2 has negative refractive power. The object side surface S3 of the second lens L2 in the near optical axis region is convex, and the object side surface S3 in the near circumference region is concave. The image side surface S4 of the second lens L2 in the near optical axis region is concave, and the image side surface S4 in the near circumference region is convex.

[0151] The third lens L3 has positive refractive power. The object side surface S5 of the third lens L3 in the near optical axis region and the near circumference region are both convex surfaces. The image side surface S6 of the third lens L3 in the near optical axis region is concave, and the image side surface S6 in the near circumference region is convex.

[0152] The fourth lens L4 has a positive refractive power. The object side surface S7 of the fourth lens L4 in the near optical axis region is a concave surface, and the object side surface S7 in the near circumference region is a convex surface. The image side surface S8 of the fourth lens L4 in the near optical axis region is a convex surface, and the image side surface S8 in the near circumference region is a concave surface.

[0153] The fifth lens L5 has positive refractive power, the object side surface S9 of the fifth lens L5 in the near optical axis region is convex, the object side surface S9 in the near circumference region is concave, the image side surface S10 of the fifth lens L5 in the near optical axis region is concave, and the image side surface S10 in the near circumference region is convex;

[0154] The sixth lens L6 has positive refractive power. At least one of the object-side surface S11 and the image-side surface S12 of the sixth lens L6 is provided with at least one inflection point. The object-side surface S11 of the sixth lens L6 in a near optical axis region is a convex surface, and the object-side surface S11 in a near circumferential region is a concave surface. The image-side surface S12 of the sixth lens L6 in a near optical axis region is a convex surface, and the image-side surface S12 in a near circumferential region is a concave surface.

[0155] The seventh lens L7 has negative refractive power. At least one of the object-side surface S13 and the image-side surface S14 of the seventh lens L7 is provided with at least one inflection point. The object-side surface S13 of the seventh lens L7 in a near optical axis region is a convex surface, and the object-side surface S13 in a near circumferential region is a concave surface. The image-side surface S14 of the seventh lens L7 in a near optical axis region is a concave surface, and the image-side surface S14 in a near circumferential region is a convex surface.

[0156] The other structures of the sixth embodiment are the same as those of the first embodiment, and can be referred to herein.

[0157] Table 6a shows a table of the characteristics of the optical system of this embodiment, wherein the data are obtained using visible light with a wavelength of 546 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0158] Table 6a

[0159]

[0160]

[0161] The meanings of the parameters in Table 6a are the same as those in the first embodiment.

[0162] Table 6b gives the coefficients of the higher-order terms that can be used for each aspherical mirror surface in the sixth embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0163] Table 6b

[0164]

[0165] Figure 6b The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the sixth embodiment are shown, wherein the longitudinal spherical aberration curve represents the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the curvature of the meridian imaging surface and the curvature of the sagittal imaging surface; and the distortion curve represents the distortion magnitude value corresponding to different field angles. Figure 6b It can be seen that the optical system provided in the sixth embodiment can achieve good imaging quality.

[0166] Seventh embodiment

[0167] Please refer to Figure 7a and Figure 7b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0168] The first lens L1 has positive refractive power, the object side surface S1 of the near optical axis region and the near circumference region of the first lens L1 are both concave surfaces, and the image side surface S2 of the near optical axis region and the near circumference region of the first lens L1 are both convex surfaces;

[0169] The second lens L2 has negative refractive power. The object side surface S3 of the second lens L2 in the near optical axis region is convex, the object side surface S3 in the near circumference region is concave, and the image side surfaces S4 in the near optical axis region and the near circumference region of the second lens L2 are both concave.

[0170] The third lens L3 has positive refractive power, the object side surface S5 of the third lens L3 near the optical axis region and the near circumference region are both convex surfaces, and the image side surface S6 of the third lens L3 near the optical axis region and the near circumference region are both convex surfaces;

[0171] The fourth lens L4 has negative refractive power. The object side surface S7 of the fourth lens L4 in the near optical axis region is convex, the object side surface S7 in the near circumference region is concave, and the image side surfaces S8 in the near optical axis region and the near circumference region of the fourth lens L4 are both concave.

[0172] The fifth lens L5 has negative refractive power, the object side surface S9 of the fifth lens L5 near the optical axis region and near the circumference region are both concave surfaces, and the image side surface S10 of the fifth lens L5 near the optical axis region and near the circumference region are both convex surfaces;

[0173] The sixth lens L6 has positive refractive power. At least one of the object-side surface S11 and the image-side surface S12 of the sixth lens L6 is provided with at least one inflection point. The object-side surface S11 of the sixth lens L6 in the near optical axis region is convex, the object-side surface S11 in the near circumference region is concave, and the image-side surface S12 of the sixth lens L6 in the near optical axis region and the near circumference region is convex.

[0174] The seventh lens L7 has negative refractive power. At least one of the object-side surface S13 and the image-side surface S14 of the seventh lens L7 is provided with at least one inflection point. The object-side surface S13 of the near optical axis region and the near circumference region of the seventh lens L7 are both convex surfaces, and the image-side surface S14 of the near optical axis region and the near circumference region of the seventh lens L7 are both concave surfaces.

[0175] The other structures of the seventh embodiment are the same as those of the first embodiment, and can be referred to herein.

[0176] Table 7a shows a table of the characteristics of the optical system of this embodiment, wherein the data are obtained using visible light with a wavelength of 546 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0177] Table 7a

[0178]

[0179] The meanings of the parameters in Table 7a are the same as those in the first embodiment.

[0180] Table 7b gives the coefficients of the higher-order terms that can be used for each aspherical mirror surface in the seventh embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0181] Table 7b

[0182]

[0183]

[0184] Figure 7b The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the seventh embodiment are shown, wherein the longitudinal spherical aberration curve represents the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the curvature of the meridian imaging surface and the curvature of the sagittal imaging surface; and the distortion curve represents the distortion magnitude value corresponding to different field angles. Figure 7b It can be seen that the optical system provided in the seventh embodiment can achieve good imaging quality.

[0185] Table 8 shows the values ​​of FOV, TTL / ImgH, FOV / TTL, |HDIS / f|, (|f4|+|f5|) / f, |SAG71 / R72|, (CT1+CT2+CT3) / BFL, (SAG52+SAG61) / (ET5+CT6), and (f3+|f4|) / (R31+|R41|) in the optical systems of the first to seventh embodiments.

[0186] Table 8

[0187]

[0188]

[0189] It can be seen from Table 8 that the optical systems of the first embodiment to the seventh embodiment all satisfy the following conditional expressions: 101.0≤FOV≤105.0, 1.1<TTL / ImgH<1.45, 19.00<FOV / TTL≤25.00, |HDIS / f|<1.45, 5.00<(|f4|+|f5|) / f<423.00, |SAG71 / R72|<0.50, 1.6<(CT1+CT2+CT3) / BFL<2.90, 0.3<(SAG52+SAG61) / (ET5+CT6)<1.20, (f3+|f4|) / (R31+|R41|)<12.00.

[0190] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. An optical system, characterized in that: There are seven lenses with refractive power, which include the following from the object side to the image side along the optical axis: A first lens has positive refractive power, and both the object side surface and the image side surface of the first lens are aspherical surfaces; A second lens has negative refractive power, the object side surface of the second lens in the near optical axis region is convex, the image side surface of the second lens in the near optical axis region is concave, and the image side surface of the second lens is aspherical; A third lens has positive refractive power, the object side surface of the third lens near the optical axis area is convex, and the image side surface of the third lens near the circumference area is convex; a fourth lens having refractive power, wherein both the object side surface and the image side surface of the fourth lens are aspherical surfaces; a fifth lens having refractive power, wherein both the object side surface and the image side surface of the fifth lens are aspherical surfaces, and at least one surface of the object side surface and the image side surface of the fifth lens is provided with at least one inflection point; a sixth lens having positive refractive power, wherein the object side surface of the sixth lens near the optical axis is a convex surface, the object side surface and the image side surface of the sixth lens are both aspherical surfaces, and at least one surface of the object side surface and the image side surface of the sixth lens is provided with at least one inflection point; A seventh lens having negative refractive power, wherein the object side surface of the seventh lens in the near optical axis region is convex, the image side surface of the seventh lens in the near optical axis region is concave, the object side surface and the image side surface of the seventh lens are both aspherical surfaces, and at least one of the object side surface and the image side surface of the seventh lens is provided with at least one inflection point; The optical system satisfies the condition: 101.0≤FOV≤105.0; Wherein, FOV is the maximum field of view of the optical system.

2. The optical system according to claim 1, wherein: The optical system satisfies the condition: 1.10<TTL / ImgH<1.45; Wherein, TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, and ImgH is half of the diagonal length of the effective imaging area on the imaging plane.

3. The optical system according to claim 1, wherein: The optical system satisfies the condition: 19.00<FOV / TTL≤25.00; Wherein, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis.

4. The optical system according to claim 1, wherein: The optical system satisfies the condition: |HDIS / f|<1.45; Wherein, HDIS is the TV distortion value of the optical system in the horizontal direction, and f is the effective focal length of the optical system.

5. The optical system according to claim 1, wherein: The optical system satisfies the condition: 5.00<(|f4|+|f5|) / f<423.00; Among them, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical system.

6. The optical system according to claim 1, wherein: The optical system satisfies the condition: |SAG71 / R72|<0.50; Among them, SAG71 is the maximum sag height of the object side surface of the seventh lens in the axial direction, and R72 is the curvature radius of the image side surface optical axis of the seventh lens.

7. The optical system according to claim 1, wherein: The optical system satisfies the condition: 1.60<(CT1+CT2+CT3) / BFL<2.90; Among them, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, and BFL is the closest distance between the image side surface of the seventh lens and the imaging surface in the direction parallel to the optical axis.

8. The optical system according to claim 1, wherein: The optical system satisfies the condition: 0.30<(SAG52+SAG61) / (ET5+CT6)<1.20; Among them, SAG52 is the maximum sag of the image side of the fifth lens in the axial direction, SAG61 is the maximum sag of the object side of the sixth lens in the axial direction, ET5 is the thickness of the fifth lens at the maximum optical effective diameter, and CT6 is the thickness of the sixth lens on the optical axis.

9. The optical system according to claim 1, wherein: The optical system satisfies the condition: (f3+|f4|) / (R31+|R41|)<12.00; Among them, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, R31 is the radius of curvature of the object side of the third lens at the optical axis, and R41 is the radius of curvature of the object side of the fourth lens at the optical axis.

10. A lens module, characterized in that: Comprising the optical system according to any one of claims 1 to 9.

11. An electronic device, characterized in that: The electronic device comprises a housing and a lens module as claimed in claim 10, wherein the lens module is arranged in the housing.

Images