Optical System, Lens Module, and Electronic Device

Abstract

The present invention provides an optical system, a lens module, and an electronic device. The optical system sequentially includes, from the object side to the image side along the optical axis direction: a first lens having a positive refractive power, with a convex surface near the optical axis on the object side surface; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a refractive power; a sixth lens having a positive refractive power; a seventh lens having a negative refractive power, with a concave surface near the optical axis on the image side surface; the optical system satisfies the conditional formula: 4 ≤ (Y72 * TL) / (ET7 * f) ≤ 10, where Y72 is the maximum optical effective radius of the image side surface of the seventh lens, TL is the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis, ET7 is the distance on the optical axis from the object side surface of the seventh lens at the maximum optical effective diameter to the image side surface of the seventh lens at the maximum optical effective diameter, and f is the focal length of the optical system. This application can meet the requirements of wide-angle shooting and miniaturization.

Description

Technical Field

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

[0002] Nowadays, with the rapid development of technology, consumers have higher and higher requirements for the imaging quality of mobile electronic products. To meet the high-order imaging system and achieve a wide-angle shooting effect, a seven-piece lens can be one of the accessory options for various types of portable electronic devices with a camera. However, the existing seven-piece lens cannot meet the requirements of both a large field of view and miniaturization at the same time. Summary of the Invention

[0003] The purpose of the present application is to provide an optical system, a lens module, and an electronic device to solve the above technical problems.

[0004] The present invention provides an optical system, which sequentially includes, from the object side to the image side along the optical axis direction: a first lens, having a positive refractive power, and the object side surface of the first lens near the optical axis is a convex surface; a second lens, having a refractive power; a third lens, having a refractive power; a fourth lens, having a refractive power; a fifth lens, having a refractive power; a sixth lens, having a positive refractive power; a seventh lens, having a negative refractive power, and the image side surface of the seventh lens near the optical axis is a concave surface; the optical system satisfies the conditional formula: 4 ≤ (Y72 * TL) / (ET7 * f) ≤ 10, where Y72 is the maximum optical effective radius of the image side surface of the seventh lens, TL is the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis, ET7 is the distance on the optical axis from the object side surface of the seventh lens at the maximum optical effective diameter to the image side surface of the seventh lens at the maximum optical effective diameter, and f is the focal length of the optical system. The present application enables the seven-piece optical system to meet the requirements of high pixels and good image quality by reasonably configuring the surface types and refractive powers of each lens from the first lens to the seventh lens. When the optical system satisfies the above conditional formula, the large field of view of the optical system and the thickness of the optical system can be balanced, and the size of the optical system can be reduced while ensuring the molding yield of the seventh lens.

[0005] Among them, the optical system satisfies the conditional formula: 2 ≤ TL / EPD ≤ 3, where EPD is the entrance pupil diameter of the optical system. When the optical system satisfies the above conditional formula, the total length of the optical system can be made smaller and the light incident amount can be increased.

[0006] Among them, the optical system satisfies the conditional formula: 9 ≤ (|AL1S1| + |AL2S1|) / f ≤ 20, where the effective diameter of the object side surface of the first lens has tangent planes everywhere, the tangent planes intersect with the plane perpendicular to the optical axis to form acute angles, the maximum value of the acute angle is AL1S1, the effective diameter of the object side surface of the second lens has tangent planes everywhere, the tangent planes intersect with the plane perpendicular to the optical axis to form acute angles, and the maximum value of the acute angle is AL1S2. When the optical system satisfies the above conditional formula, the production sensitivity of the first lens can be reduced, and a larger field of view angle can be achieved.

[0007] Among them, the optical system satisfies the conditional formula: 10 ≤ MVd / f ≤ 20, where MVd is the average Abbe number of the first lens to the seventh lens. When the optical system satisfies the above conditional formula, chromatic aberration can be balanced, different refractive indices corresponding to high Abbe numbers and low Abbe numbers can be matched, and a larger field of view angle and good optical imaging performance can be achieved through different material combinations.

[0008] Among them, the optical system satisfies the conditional formula: 0 ≤ ET1 / (CT1 * f) ≤ 1mm －1 , where ET1 is the distance from the object side surface of the first lens at the maximum optical effective diameter to the image side surface of the first lens at the maximum optical effective diameter on the optical axis, and CT1 is the thickness of the first lens on the optical axis. When the optical system satisfies the above conditional formula, it is beneficial to the molding of the first lens.

[0009] Among them, the optical system satisfies the conditional formula: 0 ≤ ET7 / (CT7 * f) ≤ 1mm －1 , where CT7 is the thickness of the seventh lens on the optical axis. When the optical system satisfies the above conditional formula, it is beneficial to the molding of the seventh lens.

[0010] Among them, the optical system satisfies the conditional formula: 0 ≤ EPD / f ≤ 1, where EPD is the entrance pupil diameter of the optical system. When the optical system satisfies the above conditional formula, the light passing amount and the image plane shift can be balanced, and a large aperture and a larger field of view angle can be achieved.

[0011] Among them, the optical system satisfies the conditional formula: 0 ≤ (MIN6 * MAX7) / (MAX6 * MIN7) ≤ 1, where MIN6 is the minimum thickness of the sixth lens in the optical axis direction within the maximum optical effective diameter, MAX6 is the maximum thickness of the sixth lens in the optical axis direction within the maximum optical effective diameter, MIN7 is the minimum thickness of the seventh lens in the optical axis direction within the maximum optical effective diameter, and MAX7 is the maximum thickness of the seventh lens in the optical axis direction within the maximum optical effective diameter. When the optical system satisfies the above conditional formula, the injection molding yield can be improved, and the larger field of view angle and astigmatism can be balanced.

[0012] Among them, the optical system satisfies the conditional formula: 0 ≤ (CT5 + CT7) / CT6 ≤ 2, where CT5 is the thickness of the fifth lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, and CT7 is the thickness of the seventh lens on the optical axis. When the optical system satisfies the above conditional formula, it is beneficial to expand the field of view angle and balance aberrations.

[0013] Among them, the optical system satisfies the conditional formula: 1 ≤ TL / ImgH ≤ 2, where ImgH is half of the image height corresponding to the maximum field of view angle of the optical system. When the optical system satisfies the above conditional formula, it is beneficial to miniaturize the optical system.

[0014] The present invention provides a lens module, including a lens barrel, an electronic photosensitive element, and the above optical system. The optical system is disposed within the lens barrel, and the electronic photosensitive element is disposed on the image side of the optical system. The electronic photosensitive element is disposed on the image side of the optical system for converting the light of an object incident on the electronic photosensitive element through the first lens to the seventh lens into an electrical signal of an image. By installing the first lens to the seventh lens of the optical system in the lens module and reasonably configuring the surface types and refractive powers of the lenses of the first lens to the seventh lens, the seven-piece optical system can simultaneously meet the requirements of a larger field of view angle and miniaturization.

[0015] The present invention provides an electronic device, including a housing and the above lens module, and the lens module is disposed within the housing. By providing the above lens module in the electronic device, the electronic device can simultaneously meet the requirements of a larger field of view angle and miniaturization.

[0016] In summary, the seven-piece lens optical system of the present application, with a compact spatial arrangement, not only realizes wide-angle imaging, but also makes the optical system thin and light, with a shorter total length. And by reasonably distributing the refractive power, the aberrations of the overall optical system are balanced, the sensitivity of the optical system is reduced, and it can be mass-produced and processed, meeting the current market demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1a is a schematic structural diagram of the optical system of the first embodiment;

[0019] Figure 1bare the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the first embodiment;

[0020] Figure 2a is a schematic structural diagram of the optical system of the second embodiment;

[0021] Figure 2b are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the second embodiment;

[0022] Figure 3a is a schematic structural diagram of the optical system of the third embodiment;

[0023] Figure 3b are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the third embodiment;

[0024] Figure 4a is a schematic structural diagram of the optical system of the fourth embodiment;

[0025] Figure 4b are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the fourth embodiment;

[0026] Figure 5a is a schematic structural diagram of the optical system of the fifth embodiment;

[0027] Figure 5b are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the fifth embodiment;

[0028] Figure 6a is a schematic structural diagram of the optical system of the sixth embodiment;

[0029] Figure 6b are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the sixth embodiment;

[0030] Figure 7a is a schematic structural diagram of the optical system of the seventh embodiment;

[0031] Figure 7b are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the seventh embodiment. Specific Embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the protection scope of the present invention.

[0033] An embodiment of the present application provides a lens module, which includes a lens barrel, an electronic photosensitive element, and an optical system provided by an embodiment of the present invention. The first lens to the seventh lens of the optical system are installed in the lens barrel, and the electronic photosensitive element is arranged on the image side of the optical system for converting the light of an object incident on the electronic photosensitive element through the first lens to the seventh lens into an electrical signal of an image. The electronic photosensitive element can be a Complementary Metal Oxide Semiconductor (CMOS) or a Charge - coupled Device (CCD). The lens module can be an independent lens of a digital camera or an imaging module integrated on an electronic device such as a smart phone. By installing the first lens to the seventh lens of the optical system in the lens module and reasonably configuring the surface shape and refractive power of each lens from the first lens to the seventh lens, the optical system of the seven - lens type can meet the requirements of a large field of view and miniaturization at the same time.

[0034] An embodiment of the present application provides an electronic device, which includes a housing and a lens module provided by an embodiment of the present application. The lens module and the electronic photosensitive element are arranged in the housing. 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 dash cam, a wearable device, etc. By arranging the lens module in the electronic device, the electronic device can meet the requirements of a large field of view and miniaturization at the same time.

[0035] An embodiment of the present application provides an optical system, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens from the object side to the image side along the optical axis direction. Among the first lens to the seventh lens, there can be an air gap between any two adjacent lenses.

[0036] Specifically, the specific shapes and structures of the seven lenses are as follows:

[0037] The first lens has a positive refractive power, and the object side of the first lens near the optical axis is a convex surface; the second lens has a refractive power; the third lens has a refractive power; the fourth lens has a refractive power; the fifth lens has a refractive power; the sixth lens has a positive refractive power; the seventh lens has a negative refractive power, and the image side of the seventh lens near the optical axis is a concave surface; the optical system satisfies the conditional formula: 4≤(Y72*TL) / (ET7*f)≤10, where Y72 is the maximum optical effective radius of the image side of the seventh lens, TL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, ET7 is the distance from the object side of the seventh lens at the maximum optical effective diameter to the image side of the seventh lens at the maximum optical effective diameter on the optical axis, and f is the focal length of the optical system. In this application, by reasonably configuring the surface types and refractive powers of the first lens to the seventh lens, a seven-piece optical system can meet the requirements of high pixels and good image quality. When the optical system satisfies the above conditional formula, the large field of view angle of the optical system can be balanced with the thickness of the optical system, and while ensuring the forming yield of the seventh lens, the size of the optical system can be reduced.

[0038] In a specific embodiment, the optical system satisfies the conditional formula: 2≤TL / EPD≤3, where EPD is the entrance pupil diameter of the optical system. Optionally, the optical system satisfies the conditional formula: 2.143≤TL / EPD≤2.924. When the optical system satisfies the above conditional formula, the total length of the optical system can be made smaller, and the light input amount can be increased.

[0039] In a specific embodiment, the optical system satisfies the conditional formula: 9≤(|AL1S1|+|AL2S1|) / f≤20, where the object side of the first lens has a tangent plane at each point within the effective diameter, the tangent plane intersects with the plane perpendicular to the optical axis to form an acute angle, and the maximum value of the acute angle is AL1S1; the object side of the second lens has a tangent plane at each point within the effective diameter, the tangent plane intersects with the plane perpendicular to the optical axis to form an acute angle, and the maximum value of the acute angle is AL1S2. Optionally, the optical system satisfies the conditional formula: 9.754≤(|AL1S1|+|AL2S1|) / f≤18.909. When the optical system satisfies the above conditional formula, the production sensitivity of the first lens can be reduced, and a large field of view angle can be achieved.

[0040] In a specific embodiment, the optical system satisfies the conditional formula: 10≤MVd / f≤20, where MVd is the average value of the Abbe numbers of the first lens to the seventh lens. Optionally, the optical system satisfies the conditional formula: 12.114≤MVd / f≤16.05. When the optical system satisfies the above conditional formula, chromatic aberration can be balanced, and different refractive indices corresponding to high Abbe numbers and low Abbe numbers can be matched. A large field of view angle and good optical imaging performance can be achieved through different material combinations.

[0041] The optical system satisfies the conditional formula: 0 ≤ ET1 / (CT1 * f) ≤ 1 mm －1 , where ET1 is the distance from the object side surface of the first lens at the maximum optical effective diameter to the image side surface of the first lens at the maximum optical effective diameter on the optical axis, and CT1 is the thickness of the first lens on the optical axis. Optionally, the optical system satisfies the conditional formula: 0.132 mm －1 ≤ ET1 / (CT1 * f) ≤ 0.211 mm －1 . When the optical system satisfies the above conditional formula, it is beneficial to the molding of the first lens.

[0042] In a specific embodiment, the optical system satisfies the conditional formula: 0 ≤ ET7 / (CT7 * f) ≤ 1 mm －1 , where CT7 is the thickness of the seventh lens on the optical axis. Optionally, the optical system satisfies the conditional formula: 0.324 mm －1 ≤ ET7 / (CT7 * f) ≤ 0.528 mm －1 . When the optical system satisfies the above conditional formula, it is beneficial to the molding of the seventh lens.

[0043] In a specific embodiment, the optical system satisfies the conditional formula: 0 ≤ EPD / f ≤ 1, where EPD is the entrance pupil diameter of the optical system. Optionally, the optical system satisfies the conditional formula: 0.495 ≤ EPD / f ≤ 0.633. When the optical system satisfies the above conditional formula, it is possible to balance the light passing amount and the image plane shift backward, and achieve a large aperture and a relatively large field of view angle.

[0044] In a specific embodiment, the optical system satisfies the conditional formula: 0 ≤ (MIN6 * MAX7) / (MAX6 * MIN7) ≤ 1, where MIN6 is the minimum thickness of the sixth lens in the optical axis direction within the maximum optical effective diameter, MAX6 is the maximum thickness of the sixth lens in the optical axis direction within the maximum optical effective diameter, MIN7 is the minimum thickness of the seventh lens in the optical axis direction within the maximum optical effective diameter, and MAX7 is the maximum thickness of the seventh lens in the optical axis direction within the maximum optical effective diameter. Optionally, the optical system satisfies the conditional formula: 0.15 ≤ (MIN6 * MAX7) / (MAX6 * MIN7) ≤ 0.364. When the optical system satisfies the above conditional formula, it is possible to improve the injection molding yield rate and balance a relatively large field of view angle and astigmatism.

[0045] In a specific embodiment, the optical system satisfies the conditional formula: 0 ≤ (CT5 + CT7) / CT6 ≤ 2, where CT5 is the thickness of the fifth lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, and CT7 is the thickness of the seventh lens on the optical axis. Optionally, the optical system satisfies the conditional formula: 0.903 ≤ (CT5 + CT7) / CT6 ≤ 1.812. When the optical system satisfies the above conditional formula, it is beneficial to expand the field of view angle and balance aberrations.

[0046] In a specific embodiment, the optical system satisfies the conditional formula: 1 ≤ TL / ImgH ≤ 2, where ImgH is half of the image height corresponding to the maximum field of view angle of the optical system. Optionally, the optical system satisfies the conditional formula: 1.324 ≤ TL / ImgH ≤ 1.734. When the optical system satisfies the above conditional formula, it is beneficial to miniaturize the optical system.

[0047] First Embodiment

[0048] Please refer to Figure 1a and Figure 1b , the optical system of this embodiment sequentially includes, from the object side to the image side along the optical axis direction:

[0049] The first lens L1 has a positive refractive power. The object side surface S1 of the first lens L1 is convex near the optical axis, and the image side surface S2 is concave near the optical axis; the object side surface S1 of the first lens L1 is convex at the circumference, and the image side surface S2 is concave at the circumference.

[0050] The second lens L2 has a negative refractive power. The object side surface S3 of the second lens L2 is convex near the optical axis, and the image side surface S4 is concave near the optical axis; the object side surface S3 of the second lens L2 is convex at the circumference, and the image side surface S4 is concave at the circumference.

[0051] The third lens L3 has a negative refractive power. The object side surface S5 of the third lens L3 is convex near the optical axis, and the image side surface S6 is concave near the optical axis; the object side surface S5 of the third lens L3 is concave at the circumference, and the image side surface S6 is convex at the circumference.

[0052] The fourth lens L4 has a positive refractive power. The object side surface S7 of the fourth lens is convex near the optical axis, and the image side surface S8 is convex near the optical axis; the object side surface S7 of the fourth lens L4 is convex at the circumference, and the image side surface S8 is convex at the circumference.

[0053] The fifth lens L5 has a negative refractive power. The object side surface S9 of the fifth lens L5 is convex near the optical axis, and the image side surface S10 is concave near the optical axis; the object side surface S9 of the fifth lens L5 is concave at the circumference, and the image side surface S10 is convex at the circumference.

[0054] The sixth lens L6 has a positive refractive power. The object side S11 of the sixth lens L6 is convex near the optical axis, and the image side S11 is convex near the optical axis; the object side S11 of the sixth lens L6 is concave at the circumference, and the image side S12 is convex at the circumference.

[0055] The seventh lens L7 has a negative refractive power. The object side S11 of the seventh lens L7 is concave near the optical axis, and the image side S12 is concave near the optical axis; the object side S11 of the seventh lens L7 is convex at the circumference, and the image side S12 is convex at the circumference.

[0056] The materials of the above-mentioned first lens L1 to seventh lens L7 are all plastics.

[0057] In addition, the optical system further includes a diaphragm STO, an infrared filter L8, and an image plane S17. The diaphragm STO is disposed on the side of the first lens L1 away from the second lens L2 for controlling the light incident amount. In other embodiments, the diaphragm STO can also be disposed between two adjacent lenses or on other lenses. The infrared filter L8 is disposed on the image side of the seventh lens L7 and includes an object side S15 and an image side S16. The infrared filter L8 is used to filter out infrared light so that the light incident on the image plane S17 is visible light, and the wavelength of the visible light is 380nm - 780nm. The material of the infrared filter L8 is glass and can be coated on the glass. The image plane S17 is the plane where the image of the light of the object to be photographed is formed after passing through the optical system.

[0058] Table 1a shows a table of the characteristics of the optical system of this embodiment. The units of the Y radius, thickness, and focal length are all millimeters (mm).

[0059] Table 1a

[0060]

[0061]

[0062] Among them, f is the focal length of the optical system, FNO is the f-number of the optical system, and FOV is the field angle of the optical system.

[0063] In this embodiment, the object side and the image side of any one of the first lens L1 to seventh lens L7 are aspherical surfaces, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0064]

[0065] Wherein, x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis direction; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the Y radius R in Table 1a above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 1b gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of each aspherical mirror S1 - S14 in the first embodiment.

[0066] Table 1b

[0067]

[0068]

[0069] Figure 1b shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the first embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the focusing points of light rays with different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the meridional image plane curvature and sagittal image plane curvature; the distortion curve represents the distortion magnitude values corresponding to different field angles. According to Figure 1b the longitudinal spherical aberration diagram, the longitudinal spherical aberration generated by the optical system for light rays with wavelengths of 470.0000 nm, 510.0000 nm, 587.5618 nm, 610.0000 nm, and 650.0000 nm is between -0.025 mm and 0.01 mm; according to Figure 1b the astigmatism diagram, the astigmatism of the optical system for light rays with a wavelength of 587.5618 nm in the meridional direction and sagittal direction is between -0.03 mm and 0.03 mm; according to Figure 1b the distortion diagram, the distortion generated by the optical system for light rays with a wavelength of 587.5618 nm is between 0.0% and 2.0%. According to Figure 1b it can be seen that the optical system given in the first embodiment can achieve good imaging quality.

[0070] Second embodiment,

[0071] Please refer to Figure 2a and Figure 2b , the optical system of this embodiment sequentially includes, from the object side to the image side along the optical axis direction:

[0072] The first lens L1, having a positive refractive power, the object side surface S1 of the first lens L1 is convex near the optical axis, and the image side surface S2 is concave near the optical axis; the object side surface S1 of the first lens L1 is convex at the circumference, and the image side surface S2 is convex at the circumference.

[0073] The second lens L2 has a negative refractive power. The object side surface S3 of the second lens L2 is convex near the optical axis, and the image side surface S4 is concave near the optical axis. The object side surface S3 of the second lens L2 is concave at the circumference, and the image side surface S4 is convex at the circumference.

[0074] The third lens L3 has a positive refractive power. The object side surface S5 of the third lens L3 is convex near the optical axis, and the image side surface S6 is concave near the optical axis. The object side surface S5 of the third lens L3 is concave at the circumference, and the image side surface S6 is convex at the circumference.

[0075] The fourth lens L4 has a negative refractive power. The object side surface S7 of the fourth lens L4 is concave near the optical axis, and the image side surface S8 is concave near the optical axis. The object side surface S7 of the fourth lens L4 is concave at the circumference, and the image side surface S8 is convex at the circumference.

[0076] The fifth lens L5 has a positive refractive power. The object side surface S9 of the fifth lens L5 is convex near the optical axis, and the image side surface S10 is concave near the optical axis. The object side surface S9 of the fifth lens L5 is concave at the circumference, and the image side surface S10 is convex at the circumference.

[0077] The sixth lens L6 has a positive refractive power. The object side surface S11 of the sixth lens L6 is convex near the optical axis, and the image side surface S11 is convex near the optical axis. The object side surface S11 of the sixth lens L6 is concave at the circumference, and the image side surface S12 is convex at the circumference.

[0078] The seventh lens L7 has a negative refractive power. The object side surface S11 of the seventh lens L7 is concave near the optical axis, and the image side surface S12 is concave near the optical axis. The object side surface S11 of the seventh lens L7 is convex at the circumference, and the image side surface S12 is convex at the circumference.

[0079] The other structures of the second embodiment are the same as those of the first embodiment, and can be referred to.

[0080] Table 2a shows a table of the characteristics of the optical system of this embodiment. The units of the Y radius, thickness, and focal length are all millimeters (mm).

[0081] Table 2a

[0082]

[0083] Among them, the meanings of the parameters in Table 2a are the same as those of the parameters in the first embodiment.

[0084] Table 2b gives the high-order term coefficients of the aspherical mirror surfaces that can be used in the second embodiment. Among them, the aspherical surface types can be defined by the formulas given in the first embodiment.

[0085] Table 2b

[0086]

[0087]

[0088] Figure 2b The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the second embodiment are shown. According to Figure 2b the longitudinal spherical aberration diagram, the longitudinal spherical aberration generated by the optical system for light rays with wavelengths of 470.0000 nm, 510.0000 nm, 587.5618 nm, 610.0000 nm, and 650.0000 nm is between -0.075 mm and 0.03 mm; according to Figure 2b the astigmatism diagram, the astigmatism of the optical system for the light ray with a wavelength of 587.5618 nm in the meridional direction and the sagittal direction is between -0.01 mm and 0.04 mm; according to Figure 2b the distortion diagram, the distortion generated by the optical system for the light ray with a wavelength of 587.5618 nm is between 0.0% and 2.0%. According to Figure 2b it can be seen that the optical system given in the second embodiment can achieve good imaging quality.

[0089] The third embodiment,

[0090] Please refer to Figure 3a and Figure 3b , the optical system of this embodiment sequentially includes, from the object side to the image side along the optical axis direction:

[0091] The first lens L1, having a positive refractive power, the object side surface S1 of the first lens L1 is convex near the optical axis, and the image side surface S2 is concave near the optical axis; the object side surface S1 of the first lens L1 is convex at the circumference, and the image side surface S2 is convex at the circumference.

[0092] The second lens L2, having a negative refractive power, the object side surface S3 of the second lens L2 is convex near the optical axis, and the image side surface S4 is concave near the optical axis; the object side surface S3 of the second lens L2 is convex at the circumference, and the image side surface S4 is concave at the circumference.

[0093] The third lens L3, having a negative refractive power, the object side surface S1 of the third lens L3 is convex near the optical axis, and the image side surface S2 is concave near the optical axis; the object side surface S5 of the third lens L3 is concave at the circumference, and the image side surface S6 is convex at the circumference.

[0094] The fourth lens L4, having a positive refractive power, the object side surface S7 of the fourth lens L4 is convex near the optical axis, and the image side surface S8 is convex near the optical axis; the object side surface S7 of the fourth lens L4 is concave at the circumference, and the image side surface S8 is convex at the circumference.

[0095] The fifth lens L5 has a negative refractive power. The object side surface S9 of the fifth lens L5 is concave near the optical axis, and the image side surface S10 is concave near the optical axis; the object side surface S9 of the fifth lens L5 is concave at the circumference, and the image side surface S10 is convex at the circumference.

[0096] The sixth lens L6 has a positive refractive power. The object side surface S11 of the sixth lens L6 is convex near the optical axis, and the image side surface S11 is convex near the optical axis; the object side surface S11 of the sixth lens L6 is concave at the circumference, and the image side surface S12 is convex at the circumference.

[0097] The seventh lens L7 has a negative refractive power. The object side surface S11 of the seventh lens L7 is concave near the optical axis, and the image side surface S12 is concave near the optical axis; the object side surface S11 of the seventh lens L7 is concave at the circumference, and the image side surface S12 is convex at the circumference.

[0098] The other structures of the third embodiment are the same as those of the first embodiment, and can be referred to.

[0099] Table 3a shows a table of the characteristics of the optical system of this embodiment. The units of the Y radius, thickness, and focal length are all millimeters (mm).

[0100] Table 3a

[0101]

[0102]

[0103] Among them, the meanings of the parameters in Table 3a are the same as those of the parameters in the first embodiment.

[0104] Table 3b gives the high-order term coefficients available for each aspherical mirror surface in the third embodiment. Among them, each aspherical surface type can be defined by the formula given in the first embodiment.

[0105] Table 3b

[0106]

[0107] Figure 3b Shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the third embodiment. According to Figure 3b The longitudinal spherical aberration diagram shows that the longitudinal spherical aberration generated by the optical system for light rays with wavelengths of 470.0000 nm, 510.0000 nm, 587.5618 nm, 610.0000 nm, and 650.0000 nm is between -0.02 mm and 0.02 mm; according to Figure 3b The astigmatism diagram shows that the astigmatism of the optical system for light rays with a wavelength of 587.5618 nm in the meridional direction and the sagittal direction is between -0.02 mm and 0.02 mm; according toFigure 3b As can be seen from the distortion diagram, the distortion generated by the optical system for the light with a wavelength of 587.5618 nm is between 0.0% and 2.0%. According to Figure 3b it can be known that the optical system given in the third embodiment can achieve good imaging quality.

[0108] Fourth Embodiment

[0109] Please refer to Figure 4a and Figure 4b , the optical system of this embodiment sequentially includes, from the object side to the image side along the optical axis direction:

[0110] The first lens L1 has a positive refractive power. The object side surface S1 of the first lens L1 is convex near the optical axis, and the image side surface S2 is concave near the optical axis; the object side surface S1 of the first lens L1 is convex at the circumference, and the image side surface S2 is concave at the circumference.

[0111] The second lens L2 has a positive refractive power. The object side surface S3 of the second lens L2 is convex near the optical axis, and the image side surface S4 is concave near the optical axis; the object side surface S3 of the second lens L2 is convex at the circumference, and the image side surface S4 is concave at the circumference.

[0112] The third lens L3 has a negative refractive power. The object side surface S1 of the third lens L3 is concave near the optical axis, and the image side surface S2 is convex near the optical axis; the object side surface S5 of the third lens L3 is concave at the circumference, and the image side surface S6 is convex at the circumference.

[0113] The fourth lens L4 has a positive refractive power. The object side surface S7 of the fourth lens L4 is convex near the optical axis, and the image side surface S8 is convex near the optical axis; the object side surface S7 of the fourth lens L4 is convex at the circumference, and the image side surface S8 is convex at the circumference.

[0114] The fifth lens L5 has a positive refractive power. The object side surface S9 of the fifth lens L5 is convex near the optical axis, and the image side surface S10 is concave near the optical axis; the object side surface S9 of the fifth lens L5 is concave at the circumference, and the image side surface S10 is convex at the circumference.

[0115] The sixth lens L6 has a positive refractive power. The object side surface S11 of the sixth lens L6 is concave near the optical axis, and the image side surface S11 is convex near the optical axis; the object side surface S11 of the sixth lens L6 is concave at the circumference, and the image side surface S12 is convex at the circumference.

[0116] The seventh lens L7 has a negative refractive power. The object side surface S11 of the seventh lens L7 is concave near the optical axis, and the image side surface S12 is concave near the optical axis; the object side surface S11 of the seventh lens L7 is convex at the circumference, and the image side surface S12 is convex at the circumference.

[0117] The other structures of the fourth embodiment are the same as those of the first embodiment, and can be referred to accordingly.

[0118] Table 4a shows a table of the characteristics of the optical system of this embodiment. The units of the Y radius, thickness, and focal length are all millimeters (mm).

[0119] Table 4a

[0120]

[0121]

[0122] Among them, the meanings of the parameters in Table 4a are the same as those of the parameters in the first embodiment.

[0123] Table 4b gives the higher-order term coefficients that can be used for each aspherical mirror surface in the fourth embodiment. Among them, each aspherical surface type can be defined by the formula given in the first embodiment.

[0124] Table 4b

[0125]

[0126] Figure 4b Shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the fourth embodiment. According to Figure 4b the longitudinal spherical aberration diagram, the longitudinal spherical aberration generated by the optical system for the light rays with wavelengths of 470.0000 nm, 510.0000 nm, 587.5618 nm, 610.0000 nm, and 650.0000 nm is between -0.06 mm and 0.02 mm; according to Figure 4b the astigmatism diagram, the astigmatism of the optical system for the light ray with a wavelength of 587.5618 nm in the meridional direction and the sagittal direction is between -0.02 mm and 0.02 mm; according to Figure 4b the distortion diagram, the distortion generated by the optical system for the light ray with a wavelength of 587.5618 nm is between 0.0% and 2.0%. According to Figure 4b it can be known that the optical system given in the fourth embodiment can achieve good imaging quality.

[0127] Fifth embodiment,

[0128] Please refer to Figure 5a and Figure 5b , the optical system of this embodiment sequentially includes, from the object side to the image side along the optical axis direction:

[0129] The first lens L1, which has a positive refractive power. The object side surface S1 of the first lens L1 is convex near the optical axis, and the image side surface S2 is convex near the optical axis; the object side surface S1 of the first lens L1 is convex at the circumference, and the image side surface S2 is convex at the circumference.

[0130] The second lens L2 has a negative refractive power. The object side S3 of the second lens L2 is concave near the optical axis, and the image side S4 is concave near the optical axis; the object side S3 of the second lens L2 is concave at the circumference, and the image side S4 is convex at the circumference.

[0131] The third lens L3 has a positive refractive power. The object side S5 of the third lens L3 is convex near the optical axis, and the image side S6 is concave near the optical axis; the object side S5 of the third lens L3 is convex at the circumference, and the image side S6 is concave at the circumference.

[0132] The fourth lens L4 has a positive refractive power. The object side S7 of the fourth lens L4 is convex near the optical axis, and the image side S8 is convex near the optical axis; the object side S7 of the fourth lens L4 is convex at the circumference, and the image side S8 is convex at the circumference.

[0133] The fifth lens L5 has a positive refractive power. The object side S9 of the fifth lens L5 is convex near the optical axis, and the image side S10 is concave near the optical axis; the object side S9 of the fifth lens L5 is convex at the circumference, and the image side S10 is concave at the circumference.

[0134] The sixth lens L6 has a positive refractive power. The object side S11 of the sixth lens L6 is convex near the optical axis, and the image side S11 is concave near the optical axis; the object side S11 of the sixth lens L6 is concave at the circumference, and the image side S12 is convex at the circumference.

[0135] The seventh lens L7 has a negative refractive power. The object side S11 of the seventh lens L7 is convex near the optical axis, and the image side S12 is concave near the optical axis; the object side S11 of the seventh lens L7 is convex at the circumference, and the image side S12 is convex at the circumference.

[0136] The other structures of the fifth embodiment are the same as those of the first embodiment, and can be referred to.

[0137] Table 5a shows a table of the characteristics of the optical system of this embodiment. The units of the Y radius, thickness, and focal length are all millimeters (mm).

[0138] Table 5a

[0139]

[0140]

[0141] Among them, the meanings of the parameters in Table 5a are the same as those of the parameters in the first embodiment.

[0142] Table 5b gives the coefficients of the higher-order terms for each aspherical mirror surface that can be used in the fifth embodiment. Among them, each aspherical surface type can be defined by the formula given in the first embodiment.

[0143] Table 5b

[0144]

[0145] Figure 5b shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the fifth embodiment. According to Figure 5b the longitudinal spherical aberration diagram, the longitudinal spherical aberration generated by the optical system for light rays with wavelengths of 470.0000 nm, 510.0000 nm, 587.5618 nm, 610.0000 nm, and 650.0000 nm is between -0.025 mm and 0.02 mm; according to Figure 5b the astigmatism diagram, the astigmatism of the optical system for light rays with a wavelength of 587.5618 nm in the meridional direction and the sagittal direction is between -0.01 mm and 0.03 mm; according to Figure 5b the distortion diagram, the distortion generated by the optical system for light rays with a wavelength of 587.5618 nm is between 0.0% and 2.0%. According to Figure 5b it can be seen that the optical system given in the fifth embodiment can achieve good imaging quality.

[0146] Sixth embodiment,

[0147] Please refer to Figure 6a and Figure 6b , the optical system of this embodiment sequentially includes, from the object side to the image side along the optical axis direction:

[0148] The first lens L1, having a positive refractive power, the object side surface S1 of the first lens L1 is convex near the optical axis, and the image side surface S2 is concave near the optical axis; the object side surface S1 of the first lens L1 is convex at the circumference, and the image side surface S2 is convex at the circumference.

[0149] The second lens L2, having a negative refractive power, the object side surface S3 of the second lens L2 is convex near the optical axis, and the image side surface S4 is concave near the optical axis; the object side surface S3 of the second lens L2 is convex at the circumference, and the image side surface S4 is concave at the circumference.

[0150] The third lens L3, having a negative refractive power, the object side surface S1 of the third lens L3 is convex near the optical axis, and the image side surface S2 is concave near the optical axis; the object side surface S5 of the third lens L3 is convex at the circumference, and the image side surface S6 is concave at the circumference.

[0151] The fourth lens L4 has a positive refractive power. The object side S7 of the fourth lens L4 is convex near the optical axis, and the image side S8 is concave near the optical axis. The object side S7 of the fourth lens L4 is convex at the circumference, and the image side S8 is concave at the circumference.

[0152] The fifth lens L5 has a negative refractive power. The object side S9 of the fifth lens L5 is convex near the optical axis, and the image side S10 is concave near the optical axis. The object side S9 of the fifth lens L5 is concave at the circumference, and the image side S10 is convex at the circumference.

[0153] The sixth lens L6 has a positive refractive power. The object side S11 of the sixth lens L6 is convex near the optical axis, and the image side S11 is convex near the optical axis. The object side S11 of the sixth lens L6 is convex at the circumference, and the image side S12 is concave at the circumference.

[0154] The seventh lens L7 has a negative refractive power. The object side S11 of the seventh lens L7 is concave near the optical axis, and the image side S12 is concave near the optical axis. The object side S11 of the seventh lens L7 is convex at the circumference, and the image side S12 is convex at the circumference.

[0155] The other structures of the sixth embodiment are the same as those of the first embodiment, and can be referred to.

[0156] Table 6a shows a table of the characteristics of the optical system of this embodiment. The units of the Y radius, thickness, and focal length are all millimeters (mm).

[0157] Table 6a

[0158]

[0159] Among them, the meanings of the parameters in Table 6a are the same as those of the parameters in the first embodiment.

[0160] Table 6b gives the higher-order term coefficients of the aspherical mirrors that can be used in the sixth embodiment. Among them, the aspherical surface types can be defined by the formulas given in the first embodiment.

[0161] Table 6b

[0162]

[0163] Figure 6b Shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the sixth embodiment. According to Figure 6b The longitudinal spherical aberration diagram shows that the longitudinal spherical aberration generated by the optical system for light rays with wavelengths of 470.0000 nm, 510.0000 nm, 587.5618 nm, 610.0000 nm, and 650.0000 nm is between -0.01 mm and 0.01 mm; according toFigure 6b From the astigmatism diagram, it can be seen that the astigmatism of the optical system for light with a wavelength of 587.5618 nm in the meridional direction and the sagittal direction is between -0.06 mm and 0.01 mm; according to Figure 6b From the distortion diagram, it can be seen that the distortion generated by the optical system for light with a wavelength of 587.5618 nm is between 0.0% and 2.0%. According to Figure 6b It can be seen that the optical system given in the sixth embodiment can achieve good imaging quality.

[0164] Seventh Embodiment,

[0165] Please refer to Figure 7a and Figure 7b , the optical system of this embodiment sequentially includes, from the object side to the image side along the optical axis direction:

[0166] The first lens L1, having a positive refractive power, the object side surface S1 of the first lens L1 is convex near the optical axis, and the image side surface S2 is convex near the optical axis; the object side surface S1 of the first lens L1 is convex at the circumference, and the image side surface S2 is convex at the circumference.

[0167] The second lens L2, having a negative refractive power, the object side surface S3 of the second lens L2 is concave near the optical axis, and the image side surface S4 is convex near the optical axis; the object side surface S3 of the second lens L2 is concave at the circumference, and the image side surface S4 is convex at the circumference.

[0168] The third lens L3, having a positive refractive power, the object side surface S1 of the third lens L3 is convex near the optical axis, and the image side surface S2 is concave near the optical axis; the object side surface S5 of the third lens L3 is convex at the circumference, and the image side surface S6 is concave at the circumference.

[0169] The fourth lens L4, having a positive refractive power, the object side surface S7 of the fourth lens L4 is concave near the optical axis, and the image side surface S8 is convex near the optical axis; the object side surface S7 of the fourth lens L4 is convex at the circumference, and the image side surface S8 is convex at the circumference.

[0170] The fifth lens L5, having a positive refractive power, the object side surface S9 of the fifth lens L5 is convex near the optical axis, and the image side surface S10 is convex near the optical axis; the object side surface S9 of the fifth lens L5 is concave at the circumference, and the image side surface S10 is convex at the circumference.

[0171] The sixth lens L6, having a positive refractive power, the object side surface S11 of the sixth lens L6 is convex near the optical axis, and the image side surface S11 is convex near the optical axis; the object side surface S11 of the sixth lens L6 is concave at the circumference, and the image side surface S12 is convex at the circumference.

[0172] The seventh lens L7 has a negative refractive power. The object side S11 of the seventh lens L7 is convex near the optical axis, and the image side S12 is concave near the optical axis; the object side S11 of the seventh lens L7 is convex at the circumference, and the image side S12 is convex at the circumference.

[0173] The other structures of the seventh embodiment are the same as those of the first embodiment, and can be referred to.

[0174] Table 7a shows a table of the characteristics of the optical system of this embodiment. The units of the Y radius, thickness, and focal length are all millimeters (mm).

[0175] Table 7a

[0176]

[0177] Among them, the meanings of the parameters in Table 7a are the same as those of the parameters in the first embodiment.

[0178] Table 7b gives the higher-order term coefficients of the aspherical mirror surfaces that can be used in the seventh embodiment. Among them, the aspherical surface types can be defined by the formulas given in the first embodiment.

[0179] Table 7b

[0180]

[0181]

[0182] Figure 7b Shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the seventh embodiment. According to Figure 7b The longitudinal spherical aberration diagram shows that the longitudinal spherical aberration generated by the optical system for light rays with wavelengths of 470.0000 nm, 510.0000 nm, 587.5618 nm, 610.0000 nm, and 650.0000 nm is between -0.04 mm and 0.02 mm; according to Figure 7b The astigmatism diagram shows that the astigmatism of the optical system for light rays with a wavelength of 587.5618 nm in the meridional direction and the sagittal direction is between -0.01 mm and 0.03 mm; according to Figure 7b The distortion diagram shows that the distortion generated by the optical system for light rays with a wavelength of 587.5618 nm is between 0.0% and 2.0%. According to Figure 7b It can be seen that the optical system given in the seventh embodiment can achieve good imaging quality.

[0183] Table 8 shows the values of (Y72*TL) / (ET7*f), TL / EPD, (|AL1S1|+|AL2S1|) / f, MVd / f, ET1 / (CT1*f), ET7 / (CT7*f), EPD / f, (MIN6*MAX7) / (MAX6*MIN7), (CT5+CT7) / CT6, and TL / ImgH for the optical systems of the first to seventh embodiments.

[0184] Table 8

[0185] (Y72 * TL) / (ET7 * f) TL / EPD (|AL1S1| + |AL2S1|) / f MVd / f ET1 / (CT1 * f) First Embodiment 7.437 2.746 9.754 13.991 0.188 Second Embodiment 9.036 2.742 18.909 12.606 0.184 Third Embodiment 4.984 2.143 18.205 13.462 0.132 Fourth Embodiment 7.328 2.244 13.359 13.037 0.143 Fifth Embodiment 6.711 2.924 12.886 12.114 0.153 Sixth Embodiment 6.741 2.725 15.671 16.05 0.211 Seventh Embodiment 6.753 2.876 10.886 12.532 0.152 ET7 / (CT7 * f) EPD / f (MIN6 * MAX7) / (MAX6 * MIN7) (CT5 + CT7) / CT6 TL / ImgH First Embodiment 0.470 0.505 0.204 0.903 1.36 Second Embodiment 0.374 0.495 0.207 1.323 1.324 Third Embodiment 0.528 0.633 0.261 1.068 1.581 Fourth Embodiment 0.416 0.606 0.223 1.092 1.475 Fifth Embodiment 0.324 0.513 0.364 1.812 1.734 Sixth Embodiment 0.495 0.5 0.15 0.925 1.491 Seventh Embodiment 0.457 0.526 0.254 1.384 1.692

[0186] As can be seen from Table 8, each embodiment satisfies the following conditional expressions: 4 ≤ (Y72*TL) / (ET7*f) ≤ 10, 2 ≤ TL / EPD ≤ 3, 9 ≤ (|AL1S1|+|AL2S1|) / f ≤ 20, 10 ≤ MVd / f ≤ 20, 0 ≤ ET1 / (CT1*f) ≤ 1 mm －1 、0 ≤ ET7 / (CT7*f) ≤ 1 mm －1 、0 ≤ EPD / f ≤ 1, 0 ≤ (MIN6*MAX7) / (MAX6*MIN7) ≤ 1, 0 ≤ (CT5+CT7) / CT6 ≤ 2, 1 ≤ TL / ImgH ≤ 2.

[0187] The technical features of the above embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0188] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed. However, it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An optical system, characterized in that, There are a total of seven lenses with refractive power, which successively include, from the object side to the image side along the optical axis direction: The first lens, having positive refractive power, and the object side surface of the first lens near the optical axis is a convex surface; The second lens, having refractive power; The third lens, having refractive power; The fourth lens, having refractive power; The fifth lens, having refractive power; The sixth lens, having positive refractive power; The seventh lens, having negative refractive power, and the image side surface of the seventh lens near the optical axis is a concave surface; The optical system satisfies the conditional expressions: 4.984 ≤ (Y72 * TL) / (ET7 * f) ≤ 9.036, 0.15 ≤ (MIN6 * MAX7) / (MAX6 * MIN7) ≤ 0.364, where Y72 is the maximum optical effective radius of the image side surface of the seventh lens, TL is the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis, ET7 is the distance on the optical axis from the object side surface of the seventh lens at the maximum optical effective diameter to the image side surface of the seventh lens at the maximum optical effective diameter, f is the focal length of the optical system, MIN6 is the minimum thickness of the sixth lens in the optical axis direction within the maximum optical effective diameter, MAX6 is the maximum thickness of the sixth lens in the optical axis direction within the maximum optical effective diameter, MIN7 is the minimum thickness of the seventh lens in the optical axis direction within the maximum optical effective diameter, and MAX7 is the maximum thickness of the seventh lens in the optical axis direction within the maximum optical effective diameter.

2. The optical system according to claim 1, wherein, The optical system satisfies the conditional expression: 2 ≤ TL / EPD ≤ 3, where EPD is the entrance pupil diameter of the optical system.

3. The optical system according to claim 1, characterized in that, The optical system satisfies the conditional expression: 9.754 ≤ (|AL1S1| + |AL2S1|) / f ≤ 18.909, where each point within the effective diameter of the object side surface of the first lens has a tangent plane, the tangent plane intersects with the plane perpendicular to the optical axis to form an acute angle, and the maximum value of the acute angle is AL1S1, each point within the effective diameter of the object side surface of the second lens has a tangent plane, the tangent plane intersects with the plane perpendicular to the optical axis to form an acute angle, and the maximum value of the acute angle is AL1S2.

4. The optical system according to claim 1, characterized in that, The optical system satisfies the conditional expression: 12.114 ≤ MVd / f ≤ 16.05, where MVd is the average value of the Abbe numbers from the first lens to the seventh lens.

5. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: 0.132 ≤ ET1 / (CT1 * f) ≤ 1 mm －1 , where ET1 is the distance from the object side surface of the first lens at the maximum optical effective diameter to the image side surface of the first lens at the maximum optical effective diameter on the optical axis, and CT1 is the thickness of the first lens on the optical axis.

6. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: 0.324 ≤ ET7 / (CT7 * f) ≤ 1 mm －1 , where CT7 is the thickness of the seventh lens on the optical axis.

7. The optical system according to claim 1, wherein The optical system satisfies the conditional expression: 0.495 ≤ EPD / f ≤ 1, where EPD is the entrance pupil diameter of the optical system.

8. The optical system according to claim 1, characterized in that, The optical system satisfies the conditional expression: 0.495 ≤ EPD / f ≤ 0.633, where EPD is the entrance pupil diameter of the optical system.

9. The optical system according to claim 1, characterized in that, The optical system satisfies the conditional expression: 0.903 ≤ (CT5 + CT7) / CT6 ≤ 1.812, where CT5 is the thickness of the fifth lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, and CT7 is the thickness of the seventh lens on the optical axis.

10. The optical system according to claim 1, characterized in that, The optical system satisfies the conditional expression: 1.324 ≤ TL / ImgH ≤ 1.734, where ImgH is half of the image height corresponding to the maximum field of view angle of the optical system.

11. A lens module, characterized in that, Comprising a lens barrel, an electronic photosensitive element, and an optical system as described in any one of claims 1 to 10, wherein the optical system is disposed within the lens barrel, and the electronic photosensitive element is disposed on the image side of the optical system.

12. An electronic device, characterized in that, Comprising a housing and a lens module as described in claim 11, wherein the lens module is disposed within the housing.

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