Optical lens

Abstract

The application discloses an optical lens, which comprises, in sequence from an object side to an image plane along an optical axis, an aperture stop, a first lens with positive refractive power, a second lens with positive refractive power, the object side of which is a convex surface, a third lens with positive refractive power, a fourth lens with positive refractive power, the image side of which is a convex surface, a fifth lens with negative refractive power, the object side of which is a concave surface and the image side of which is a convex surface, a sixth lens with positive refractive power, the object side of which is a concave surface and the image side of which is a convex surface near the optical axis, and a seventh lens with negative refractive power, the object side of which is a convex surface near the optical axis and the image side of which is a concave surface near the optical axis, wherein the image height IH corresponding to the maximum half field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy 1.5 < IH / EPD < 1.9. The application can realize the balance of large aperture, small total length and long focal length by reasonably constraining the surface shape and refractive power of each lens.

Description

Technical Field

[0001] This invention relates to the field of imaging lens technology, and in particular to an optical lens. Background Technology

[0002] Optical lenses, also known as camera lenses or photographic lenses, or simply lenses, are used for optical imaging. Data shows that smartphones, tablets, and feature phones account for 74.6%, 8.6%, and 7.4% of global optical lens shipments, respectively. Smartphones have the highest share, primarily due to continuous technological innovation by smartphone manufacturers. This has led to the gradual penetration of dual-camera products into the smartphone lens industry, and multi-camera products are also entering the market, enhancing the innovation capabilities of mobile phone optical lenses. Therefore, the demand for optical lenses in the mobile phone application field will continue to grow.

[0003] Based on the principles of optical lens characteristics, optical lenses can be divided into three main categories: plastic lenses, glass lenses, and hybrid glass-plastic lenses. Among these three types, glass lenses are composed of assembled glass lenses, while plastic lenses are composed of assembled plastic lenses. The two differ significantly in material properties, processing techniques, and light transmittance, resulting in vastly different applications. Generally speaking, plastic lenses are characterized by their high plasticity, ease of fabrication into aspherical shapes, and suitability for miniaturization, making them widely used in devices such as mobile phones and digital cameras. Designing compact plastic lenses with large apertures, wide field of view, and long focal lengths is a pressing issue that needs to be addressed. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide an optical lens that has at least the advantages of a large aperture, a large field of view, and a long focal length.

[0005] This invention provides an optical lens comprising, along the optical axis from the object side to the imaging plane, the following components in sequence: an aperture stop; a first lens with positive optical power; a second lens with positive optical power, the object side of which is convex; a third lens with positive optical power; a fourth lens with positive optical power, the image side of which is convex; a fifth lens with negative optical power, the object side of which is concave and the image side of which is convex; a sixth lens with positive optical power, the object side of which is concave and the image side of which is convex near the optical axis; and a seventh lens with negative optical power, the object side of which is convex near the optical axis and the image side of which is concave near the optical axis; wherein, the image height IH corresponding to the maximum half-field angle of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy the following condition: 1.5 < IH / EPD < 1.9.

[0006] Compared with existing technologies, the optical lens provided by this invention adopts a seven-lens structure. Through specific surface shape matching and reasonable optical power distribution, the optical lens has the characteristics of large field of view, large aperture, small total length and long focal length. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of the optical lens according to the first embodiment of the present invention.

[0008] Figure 2 This is an f-tan(θ) distortion curve of the optical lens of the first embodiment of the present invention.

[0009] Figure 3 This is a field curvature curve diagram of the optical lens according to the first embodiment of the present invention.

[0010] Figure 4 This is a chromatic aberration curve of the optical lens according to the first embodiment of the present invention.

[0011] Figure 5 This is a schematic diagram of the structure of the optical lens according to the second embodiment of the present invention.

[0012] Figure 6 This is an f-tan(θ) distortion curve of the optical lens according to the second embodiment of the present invention.

[0013] Figure 7 This is a field curvature curve diagram of the optical lens according to the second embodiment of the present invention.

[0014] Figure 8 This is a chromatic aberration curve of the optical lens according to the second embodiment of the present invention.

[0015] Figure 9 This is a schematic diagram of the structure of the optical lens according to the third embodiment of the present invention.

[0016] Figure 10 This is an f-tan(θ) distortion curve of the optical lens according to the third embodiment of the present invention.

[0017] Figure 11 This is a field curvature curve diagram of the optical lens according to the third embodiment of the present invention.

[0018] Figure 12 This is a chromatic aberration curve of the optical lens according to the third embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Throughout this specification, the same reference numerals refer to the same elements.

[0021] This invention proposes an optical lens with a total of seven lenses, which are arranged along the optical axis from the object side to the imaging plane as follows: aperture stop, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and filter, and the optical centers of each lens are located on the same straight line.

[0022] The first lens has positive optical power, and its object-side surface is either convex or concave, and its image-side surface is either concave or convex. The second lens has positive optical power, and its object-side surface is convex, and its image-side surface is concave. The third lens has positive optical power, and its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. The fourth lens has positive optical power, and its object-side surface is either convex or concave near the optical axis, and its image-side surface is convex. The fifth lens has negative optical power, its object-side surface is concave, and its image-side surface is convex. The sixth lens has positive optical power, its object-side surface is concave, and its image-side surface is convex near the optical axis. The seventh lens has negative optical power, its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Among these, the first, second, third, fourth, fifth, sixth, and seventh lenses are all plastic aspherical lenses.

[0023] In some embodiments, the optical lens satisfies the following condition:

[0024] 1.5 < IH / EPD < 1.9; (1)

[0025] Wherein, IH represents the image height corresponding to the maximum half-field angle of the optical lens, and EPD represents the entrance pupil diameter of the optical lens. When the above condition (1) is satisfied, by reasonably controlling the ratio of the half-image height to the entrance pupil diameter of the optical lens, it is beneficial to balance the image size and the relative illumination of the edge field of view, and achieve a balance between a large field of view, a large aperture, and miniaturization.

[0026] In some embodiments, the optical lens satisfies the following condition:

[0027] 0.28 < FFL / f < 0.4; (2)

[0028] Wherein, FFL represents the optical back focal length of the optical lens, and f represents the effective focal length of the optical lens. When the above condition (2) is satisfied, by reasonably controlling the ratio of the optical back focal length to the effective focal length of the optical lens, the optical lens can reasonably control the effective focal length of the optical lens while satisfying the requirement of a long back focal length, and it is also beneficial to the assembly of the optical lens.

[0029] In some embodiments, the optical lens satisfies the following condition:

[0030] 5.8 mm < IH < 6.2 mm; (3)

[0031] 0.9 < f / IH < 1.2; (4)

[0032] Where f represents the effective focal length of the optical lens, and IH represents the image height corresponding to the maximum half-field angle of the optical lens. When the above conditions (3) and (4) are met, it can be ensured that the optical lens has a long focal length, and that the subject can be well highlighted and the background blurred during shooting, thus enabling better portrait photography.

[0033] In some embodiments, the optical lens satisfies the following condition:

[0034] 1.3 < TTL / f < 1.6; (5)

[0035] Where TTL represents the total optical length of the optical lens, and f represents the effective focal length of the optical lens. When the above condition (5) is satisfied, by reasonably controlling the ratio of the total optical length to the effective focal length of the optical lens, the length and volume of the optical lens can be effectively limited, thereby achieving miniaturization of the optical lens.

[0036] In some embodiments, the optical lens satisfies the following condition:

[0037] 1.0 < f12 / f < 3.5; (6)

[0038] Where f12 represents the combined focal length of the first lens and the second lens, and f represents the effective focal length of the optical lens. When the above condition (6) is satisfied, by reasonably configuring the optical power of the first lens and the second lens, it helps to enhance the coma correction of the off-axis field of view, and at the same time, it effectively converges field curvature and aberrations, thereby giving the optical lens a higher resolving power.

[0039] In some embodiments, the optical lens satisfies the following condition:

[0040] 0 < (R31 + R32) / f3 < 0.2; (7)

[0041] Wherein, R31 represents the radius of curvature of the object side of the third lens, R32 represents the radius of curvature of the image side of the third lens, and f3 represents the effective focal length of the third lens. When the above condition (7) is satisfied, the focal length and surface shape of the third lens can be reasonably controlled, which helps to reduce system sensitivity and reduce molding difficulty to improve manufacturing yield. At the same time, it can also reduce stray light generated by the optical lens and improve the imaging quality of the optical lens.

[0042] In some embodiments, the optical lens satisfies the following condition:

[0043] -1.0 < (f4 + f5) / f < 0; (8)

[0044] Where f4 represents the effective focal length of the fourth lens, f5 represents the effective focal length of the fifth lens, and f represents the effective focal length of the optical lens. When the above condition (8) is satisfied, by reasonably configuring the optical power of the fourth and fifth lenses, it is helpful to strengthen the coma correction of the off-axis field of view, reduce the difficulty of aberration correction, and thus enable the optical lens to have higher resolving power.

[0045] In some embodiments, the optical lens satisfies the following condition:

[0046] -8.0 < f7 / f < -1.0; (9)

[0047] Where f7 represents the effective focal length of the seventh lens, and f represents the effective focal length of the optical lens. When the above condition (9) is satisfied, by reasonably configuring the optical power of the seventh lens, the seventh lens can balance the spherical aberration produced by the first six lenses, while strengthening the precise control of on-axis field of view aberration and improving the imaging quality of the optical lens.

[0048] In some embodiments, the optical lens satisfies the following condition:

[0049] 1.0 < D61 / D11 < 1.5; (10)

[0050] Wherein, D11 represents the effective aperture of the first lens object side, and D61 represents the effective aperture of the sixth lens object side. When the above condition (10) is satisfied, by reasonably controlling the ratio of the effective aperture of the sixth lens to the effective aperture of the first lens, the tendency of light to bend can be effectively reduced, the aberration and distortion of the off-axis field of view can be effectively corrected, and the difference in the effective aperture of each lens can be reduced, which is beneficial to the assembly of optical lenses and improves the production yield of optical lenses.

[0051] In some embodiments, the optical lens satisfies the following condition:

[0052] 3.2 < ∑CT / ∑AT < 5.2; (11)

[0053] Wherein, ∑CT represents the sum of the center thicknesses of all lenses from the first lens to the seventh lens, and ∑AT represents the sum of the air gaps between adjacent lenses from the first lens to the seventh lens. When the above condition (11) is satisfied, by reasonably controlling the ratio of the sum of the center thicknesses of each lens to the sum of the gaps between adjacent lenses, the shape and thickness of each lens can be effectively controlled, thereby making the optical lens structure compact and realizing the miniaturization of the optical lens.

[0054] In some embodiments, the optical lens satisfies the following condition:

[0055] 2.0 < CT7 / CT6 < 2.5; (12)

[0056] Wherein, CT6 represents the center thickness of the sixth lens, and CT7 represents the center thickness of the seventh lens. When the above condition (12) is satisfied, by reasonably setting the center thickness of the sixth and seventh lenses, the distortion contribution of the sixth and seventh lenses can be controlled within a reasonable range, so that the distortion of each field of view is controlled below 2%, thereby achieving a balance between small distortion and large field of view of the optical lens.

[0057] In some embodiments, the optical lens satisfies the following condition:

[0058] 0.18 < FFL / TTL < 0.27; (13)

[0059] Wherein, FFL represents the optical back focal length of the optical lens, and TTL represents the total optical length of the optical lens. When the above condition (13) is satisfied, by reasonably controlling the ratio of the optical back focal length to the total optical length of the optical lens, it is beneficial to ensure that the optical lens has the characteristic of a long back focal length, and at the same time, it is beneficial to chip assembly and improve the production yield of the optical lens.

[0060] In some embodiments, the optical lens satisfies the following condition:

[0061] 0.25<D11 / (IH×tanθ)<0.34; (14)

[0062] Where D11 represents the effective aperture of the first lens side surface, IH represents the image height corresponding to the maximum half field of view of the optical lens, and θ represents the maximum half field of view of the optical lens. When the above condition (14) is satisfied, by reasonably controlling the relationship between the effective aperture of the first lens side surface and the half image height and the corresponding maximum half field of view of the optical lens, it is beneficial to reduce the front aperture of the optical lens and realize the miniaturization of the optical lens.

[0063] In some embodiments, the optical lens satisfies the following condition:

[0064] 0.2<(CT1+CT2+CT3) / f<0.27; (15)

[0065] Wherein, CT1 represents the center thickness of the first lens, CT2 represents the center thickness of the second lens, CT3 represents the center thickness of the third lens, and f represents the effective focal length of the optical lens. When the above condition (15) is satisfied, by reasonably controlling the ratio of the first three lenses to the effective focal length of the optical lens, the ratio of each lens to the total length can be reduced, which can effectively increase the back focal length and avoid interference between the lens and the chip.

[0066] In some embodiments, the optical lens satisfies the following condition:

[0067] 1.7 < f / EPD < 2.0; (16)

[0068] Where f represents the effective focal length of the optical lens, and EPD represents the entrance pupil diameter of the optical lens. When the above condition (16) is satisfied, by reasonably controlling the ratio of the effective focal length to the entrance pupil diameter of the optical lens, the optical lens can have the characteristics of a large aperture. In particular, when the optical lens is imaging in a dark environment, it can reduce the noise caused by too weak light, thereby improving the imaging quality and enabling the optical lens to meet the imaging requirements under different light flux conditions.

[0069] In some embodiments, the optical lens satisfies the following condition:

[0070] 0.2<SAG11 / SAG12<1.4; (17)

[0071] Wherein, SAG11 represents the sag at the effective aperture of the object side of the first lens, and SAG12 represents the sag at the effective aperture of the image side of the first lens. When the above condition (17) is satisfied, the curvature of the first lens can be reasonably controlled, the molding difficulty of the first lens can be reduced, thereby reducing the processing sensitivity and improving the mass production rate of optical lenses.

[0072] In some embodiments, the optical lens satisfies the following condition:

[0073] 0.1<(CT4+CT5) / TTL<0.3; (18)

[0074] 1.5 < CT4 / CT5 < 5.0; (19)

[0075] Wherein, CT4 represents the center thickness of the fourth lens, CT5 represents the center thickness of the fifth lens, and TTL represents the total optical length of the optical lens. When the above conditions (18) and (19) are met, by reasonably setting the center thicknesses of the fourth and fifth lenses, it is possible to avoid the fifth lens being too thin, causing uneven filling of the resin material during lens molding, or the fourth lens being too thick, causing interference and lens barrel interference during lens assembly, thus affecting the imaging effect.

[0076] In some embodiments, the optical lens satisfies the following condition:

[0077] 0<(SAG62-SAG61) / DM62<0.2; (20)

[0078] Wherein, SAG61 represents the sagitta of the object-side surface of the sixth lens at the effective aperture, SAG62 represents the sagitta of the image-side surface of the sixth lens at the effective aperture, and DM62 represents the effective aperture of the image-side surface of the sixth lens. When the above condition (20) is satisfied, by reasonably setting the relationship between the sagitta and the aperture of the sixth lens, the distribution of the incident angle of light can be effectively controlled, which is beneficial to correcting the higher aberrations of the optical lens.

[0079] In some embodiments, the optical lens satisfies the following condition:

[0080] -0.1<(R61-R62) / (R61+R62)<0.1; (21)

[0081] Wherein, R61 represents the radius of curvature of the object side of the sixth lens, and R62 represents the radius of curvature of the image side of the sixth lens. When the above condition (21) is satisfied, the surface shape of the sixth lens can be reasonably controlled, thereby slowing down the shape change of the sixth lens, reducing the generation of stray light in the optical lens, realizing high-quality imaging of the optical lens, and improving the manufacturing yield of the optical lens.

[0082] In some embodiments, the optical lens satisfies the following condition:

[0083] 1.1 < DM5 / DM4 < 1.2; (22)

[0084] Wherein, DM5 represents the effective aperture of the fifth lens, and DM4 represents the effective aperture of the fourth lens. When the above condition (22) is satisfied, by reasonably controlling the ratio of the effective aperture of the fifth lens to the effective aperture of the fourth lens, the tendency of light to bend can be effectively reduced, the aberrations and distortions of the off-axis field of view can be effectively corrected, and the high-quality imaging of the optical lens can be guaranteed.

[0085] In some embodiments, the optical lens satisfies the following condition:

[0086] 0.02<CT56 / TTL<0.07; (23)

[0087] Wherein, CT56 represents the air gap between the fifth lens and the sixth lens on the optical axis, and TTL represents the total optical length of the optical lens. When the above condition (23) is satisfied, the air gap between the fifth lens and the sixth lens on the optical axis can be reasonably allocated, which can make the light deflection between the fifth lens and the sixth lens tend to be slower, thereby reducing the system sensitivity and improving the manufacturing yield of the optical lens.

[0088] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0089] In various embodiments of the present invention, when the lens in the optical lens is an aspherical lens, the aspherical surface shape of the lens satisfies the following equation:

[0090]

[0091] Where z is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis, c is the paraxial curvature of the surface, k is the quadratic surface coefficient, and A 2i For the aspherical surface shape coefficient of the 2ith order.

[0092] First Embodiment

[0093] Please see Figure 1 The diagram shown is a schematic diagram of the structure of the optical lens 100 provided in the first embodiment of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging surface S17, the following components in sequence: aperture ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and filter G1.

[0094] Among them, the first lens L1 has positive optical power, its object-side surface S1 is concave, and its image-side surface S2 is convex; the second lens L2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave; the third lens L3 has positive optical power, its object-side surface S5 is convex near the optical axis, and its image-side surface S6 is concave near the optical axis; the fourth lens L4 has positive optical power, its object-side surface S7 is convex near the optical axis, and its image-side surface S6 is concave near the optical axis. The image-side surface S8 is convex; the fifth lens L5 has negative optical power, the object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is convex; the sixth lens L6 has positive optical power, the object-side surface S11 of the sixth lens is concave, and the image-side surface S12 of the sixth lens is convex near the optical axis; the seventh lens L7 has negative optical power, the object-side surface S13 of the seventh lens is convex near the optical axis, and the image-side surface S14 of the seventh lens is concave near the optical axis; the object-side surface of filter G1 is S15, and the image-side surface is S16. Among these, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all plastic aspherical lenses.

[0095] Specifically, the design parameters of each lens of the optical lens 100 provided in this embodiment are shown in Table 1.

[0096] Table 1

[0097]

[0098] In this embodiment, the aspherical surface coefficients of each lens in the optical lens 100 are shown in Table 2.

[0099] Table 2

[0100]

[0101]

[0102] Please refer to Figure 2 , Figure 3 as well as Figure 4 The figures show the f-tan(θ) distortion curve, field curvature curve, and transverse chromatic aberration curve of the optical lens 100, respectively. The f-tan(θ) distortion of the optical lens 100 is less than 2%, the field curvature offset is controlled within ±0.15mm, and the transverse chromatic aberration offset is controlled within ±2.5μm, indicating that the distortion, field curvature, on-axis spherical aberration, and chromatic aberration of the optical lens 100 are well corrected.

[0103] Second Embodiment

[0104] Please see Figure 5The figure shown is a schematic diagram of the structure of the optical lens 200 provided in the second embodiment of the present invention. The optical lens 200 in this embodiment is roughly the same as that in the first embodiment, except that the curvature radius, aspherical coefficient and thickness of each lens surface are different.

[0105] Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in Table 3.

[0106] Table 3

[0107]

[0108]

[0109] In this embodiment, the aspherical surface coefficients of each lens in the optical lens 200 are shown in Table 4.

[0110] Table 4

[0111]

[0112]

[0113] Please refer to Figure 6 , Figure 7 as well as Figure 8 The figures show the f-tan(θ) distortion curve, field curvature curve, and lateral chromatic aberration curve of the optical lens 200, respectively. The f-tan(θ) distortion of the optical lens 200 is less than 2%, the field curvature offset is controlled within ±0.15mm, and the lateral chromatic aberration offset is controlled within ±2μm, indicating that the distortion, field curvature, and lateral chromatic aberration of the optical lens 200 are well corrected.

[0114] Third Embodiment

[0115] Please refer to Figure 9 The figure shown is a structural schematic diagram of the optical lens 300 provided in the third embodiment of the present invention. The optical lens 300 in this embodiment is roughly the same as that in the first embodiment above. The main difference is that the radius of curvature, aspherical coefficient and thickness of each lens surface are different.

[0116] Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in Table 5.

[0117] Table 5

[0118]

[0119] In this embodiment, the aspherical parameters of each lens in the optical lens 300 are shown in Table 6.

[0120] Table 6

[0121]

[0122] Please refer to Figure 10 , Figure 11 as well as Figure 12 The figures show the f-tan(θ) distortion curve, field curvature curve, and lateral chromatic aberration curve of optical lens 300, respectively. The f-tan(θ) distortion of optical lens 300 is less than 2%, the field curvature offset is controlled within ±0.1mm, and the lateral chromatic aberration offset is controlled within ±2μm, indicating that the distortion, field curvature, and lateral chromatic aberration of optical lens 300 are well corrected.

[0123] Please refer to Table 7, which shows the optical characteristics of the optical lenses provided in the above three embodiments, including the maximum field of view 2θ, total optical length TTL, half image height IH, focal length f, and the relevant values ​​corresponding to each of the aforementioned conditional expressions.

[0124] Table 7

[0125]

[0126]

[0127] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0128] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens, wherein the optical lens comprises seven lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: Aperture; A first lens with positive optical power; A second lens with positive optical power, wherein the object side of the second lens is convex; A third lens with positive optical power; A fourth lens with positive optical power, wherein the image-side surface of the fourth lens is convex; A fifth lens with negative optical power, wherein the object-side surface of the fifth lens is concave and the image-side surface of the fifth lens is convex; A sixth lens with positive optical power, wherein the object side of the sixth lens is concave; A seventh lens with negative optical power, wherein the object-side surface of the seventh lens is convex near the optical axis and the image-side surface of the seventh lens is concave near the optical axis; Wherein, the image height IH corresponding to the maximum half field of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.5 < IH / EPD < 1.9; The optical lens also satisfies the following condition: 0.28 < FFL / f < 0.4; Wherein, FFL represents the optical back focal length of the optical lens, and f represents the effective focal length of the optical lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.307≤FFL / f≤0.384; Wherein, FFL represents the optical back focal length of the optical lens, and f represents the effective focal length of the optical lens; The image height IH corresponding to the maximum half field of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy the following condition: 1.624≤IH / EPD≤1.

790.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.9 < f / IH < 1.2; Where f represents the effective focal length of the optical lens, and IH represents the image height corresponding to the maximum half field of view of the optical lens.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.3 < TTL / f < 1.6; Wherein, TTL represents the total optical length of the optical lens, and f represents the effective focal length of the optical lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.0 < f12 / f < 3.5; Where f12 represents the combined focal length of the first lens and the second lens, and f represents the effective focal length of the optical lens.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0 < (R31 + R32) / f3 < 0.2; Wherein, R31 represents the radius of curvature of the object side of the third lens, R32 represents the radius of curvature of the image side of the third lens, and f3 represents the effective focal length of the third lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: -1.0 < (f4 + f5) / f < 0; Where f4 represents the effective focal length of the fourth lens, f5 represents the effective focal length of the fifth lens, and f represents the effective focal length of the optical lens.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: -8.0 < f7 / f < -1.0; Where f7 represents the effective focal length of the seventh lens, and f represents the effective focal length of the optical lens.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.0 < D61 / D11 < 1.5; Wherein, D11 represents the effective aperture of the side surface of the first lens, and D61 represents the effective aperture of the side surface of the sixth lens.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 3.2 < ∑CT / ∑AT < 5.2; Wherein, ∑CT represents the sum of the center thicknesses of all lenses from the first lens to the seventh lens, and ∑AT represents the sum of the air gaps between adjacent lenses from the first lens to the seventh lens.

11. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 2.0 < CT7 / CT6 < 2.5; Wherein, CT6 represents the center thickness of the sixth lens, and CT7 represents the center thickness of the seventh lens.

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