Optical lens

Abstract

The present invention provides an optical lens. The optical lens includes a lens barrel, a first lens to a seventh lens disposed in the lens barrel, and a first spacer element. The aperture number Fno of the optical lens satisfies: 1.15 < Fno ≤ 1.30; the inner diameter d0s of the object-side end face of the lens barrel, the inner diameter d0m of the image-side end face of the lens barrel, and the effective focal length f of the optical lens satisfy: 0.30 < (d0m - d0s) / f ≤ 0.70; the interval distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element in the optical axis direction, the central thickness CT1 of the first lens on the optical axis, and the air interval T12 between the first lens and the second lens on the optical axis satisfy: 0.95 < EP01 / (CT1 + T12) < 1.25. The present invention solves the problem that the sensitivity of the first lens is high due to the high light incident amount in the prior art optical lens.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging devices, and more particularly, to an optical lens. Background Art

[0002] With the development of intelligent electronic devices, more and more electronic devices have a camera function, and the shooting requirements of users for electronic devices are also gradually increasing. Optical lenses are often required to have a large image plane to improve the shooting quality. However, users' shooting requirements are not limited to this. They also require that the optical lens can still have good shooting performance in low-light or dim-light environments. Therefore, optical lenses are developing in the direction of large apertures. However, a large aperture usually means more lenses, more light input, and higher sensitivity problems. Since the first lens bears all the system light, its sensitivity is relatively high and has a greater impact on the overall sensitivity.

[0003] That is to say, in the prior art, there is a problem that the high light input of the optical lens leads to high sensitivity of the first lens. Summary of the Invention

[0004] The main object of the present invention is to provide an optical lens to solve the problem that the high light input of the optical lens in the prior art leads to high sensitivity of the first lens.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided an optical lens including a lens barrel, a lens group, and a spacer element group disposed in the lens barrel. The lens group is composed of seven lenses. Along the optical axis direction from the object side to the image side, the lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has a positive optical power. The object side surface of the first lens is convex, and the image side surface of the first lens is concave. The object side surface of the second lens is convex, and the image side surface of the second lens is concave. The object side surface of the third lens is convex. The object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave. The seventh lens has a negative optical power. The object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave. The spacer element group at least includes a first spacer element. The first spacer element is located between the first lens and the second lens and is in partial contact with the image side surface of the first lens. The f-number Fno of the optical lens satisfies: 1.15 < Fno ≤ 1.30. The inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, and the effective focal length f of the optical lens satisfy: 0.30 < (d0m - d0s) / f ≤ 0.70. The spacing distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element in the optical axis direction, the central thickness CT1 of the first lens on the optical axis, and the air spacing T12 between the first lens and the second lens on the optical axis satisfy: 0.95 < EP01 / (CT1 + T12) < 1.25.

[0006] According to another aspect of the present invention, an optical lens is provided, which includes a lens barrel, a lens group and a spacer element group disposed within the lens barrel. The lens group consists of seven lenses. Along the optical axis direction from the object side to the image side, the lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has a positive optical power. The object side surface of the first lens is convex, and the image side surface of the first lens is concave. The object side surface of the second lens is convex, and the image side surface of the second lens is concave. The object side surface of the third lens is convex. The object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave. The seventh lens has a negative optical power. The object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave. The spacer element group includes at least a first spacer element. The first spacer element is located between the first lens and the second lens and is partially in contact with the image side surface of the first lens. The aperture number Fno of the optical lens satisfies: 1.15 < Fno ≤ 1.30. The inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, and the effective focal length f of the optical lens satisfy: 0.30 < (d0m - d0s) / f ≤ 0.70. The spacing distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element in the optical axis direction, the effective focal length f1 of the first lens, and the spacing distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element in the optical axis direction satisfy: 5.35 < f1 / EP01 < 7.50.

[0007] According to another aspect of the present invention, an optical lens is provided, which includes a lens barrel, a lens group and a spacer element group disposed within the lens barrel. The lens group consists of seven lenses. Along the optical axis direction from the object side to the image side, the lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has a positive optical power. The object side surface of the first lens is convex, and the image side surface of the first lens is concave. The object side surface of the second lens is convex, and the image side surface of the second lens is concave. The object side surface of the third lens is convex. The object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave. The seventh lens has a negative optical power. The object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave. The spacer element group includes at least a first spacer element. The first spacer element is located between the first lens and the second lens and is partially in contact with the image side surface of the first lens. The aperture number Fno of the optical lens satisfies: 1.15 < Fno ≤ 1.30. The inner diameter d0s of the object side end surface of the lens barrel and the maximum effective radius DT11 of the object side surface of the first lens satisfy: 2.85 < d0s / DT11 < 3.30. The curvature radius R1 of the object side surface of the first lens, the refractive index N1 of the first lens, and the inner diameter d1s of the object side surface of the first spacer element satisfy: 1.05 < R1*N1 / d1s < 1.35.

[0008] Furthermore, the inner diameter d0s of the object side end surface of the lens barrel and the maximum effective radius DT11 of the object side surface of the first lens satisfy the following relationship: 2.85 <d0s / DT11<3.30。

[0009] Furthermore, the effective focal length f1 of the first lens, the spacing distance EP01 between the object side end face of the lens barrel and the object side face of the first spacing element in the optical axis direction satisfy the following conditions: 5.35 <f1 / EP01<7.50。

[0010] Furthermore, the curvature radius R2 of the image side surface of the first lens, the outer diameter D1s of the object side surface of the first spacer element, and the inner diameter d1s of the object side surface of the first spacer element satisfy the following relationship: 2.60 <R2 / (D1s-d1s)<15.70。

[0011] Furthermore, the effective focal length f2 of the second lens and the inner diameter d1m of the image-side surface of the first spacer element satisfy: -11.00≤f2 / d1m≤17.75.

[0012] Furthermore, the maximum thickness CP1 of the first spacer element in the optical axis direction and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following conditions: 0.05 <CP1 / T12<0.45。

[0013] Furthermore, an inner diameter d1s of the object-side surface of the first spacer element and a center thickness CT1 of the first lens on the optical axis satisfy the following relationship: 3.65≤d1s / CT1<4.05.

[0014] Furthermore, the effective focal length f3 of the third lens, the curvature radius R5 of the object side surface of the third lens, and the curvature radius R6 of the image side surface of the third lens satisfy the following relationship: -13.95 <f3 / (R5+R6)≤0.35。

[0015] Furthermore, the distance L between the object side end face of the lens barrel and the image side end face of the lens barrel, and the spacing distance EP01 between the object side end face of the lens barrel and the object side face of the first spacing element in the optical axis direction satisfy the following conditions: 4.70 <L / EP01<5.30。

[0016] Furthermore, the spacer element group further includes a second spacer element, the second spacer element is located between the second lens and the third lens and is in contact with the image side surface portion of the second lens, and the spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction and the center thickness CT2 of the second lens on the optical axis satisfy the following conditions: 1.40 <EP12 / CT2≤2.80。

[0017] Furthermore, the spacer element group further includes a second spacer element, the second spacer element is located between the second lens and the third lens and is in contact with the image side surface of the second lens, and the spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction and the air spacing T23 between the second lens and the third lens on the optical axis satisfy: 0.85 <EP12 / T23<1.65。

[0018] Furthermore, the spacer element group further includes a second spacer element, the second spacer element is located between the second lens and the third lens and is in contact with the image side surface of the second lens, and the inner diameter d2s of the object side surface of the second spacer element, the inner diameter d2m of the image side surface of the second spacer element, the curvature radius R4 of the image side surface of the second lens, and the curvature radius R5 of the object side surface of the third lens satisfy the following relationship: 1.05 <d2s / R4+d2m / R5<1.25。

[0019] Furthermore, the spacer element group also includes a second spacer element, which is located between the second lens and the third lens and contacts the image side surface of the second lens. The spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction, the inner diameter d1m of the image side surface of the first spacer element, and the inner diameter d2s of the object side surface of the second spacer element satisfy: 0.25≤EP12 / d1m+EP12 / d2s<0.45.

[0020] Furthermore, the spacer element group also includes a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and contacts the image side surface of the second lens, the third spacer element is located between the third lens and the fourth lens and contacts the image side surface of the third lens, and the inner diameter d2m of the image side surface of the second spacer element, the inner diameter d3s of the object side surface of the third spacer element, the maximum effective radius DT31 of the object side surface of the third lens, and the maximum effective radius DT32 of the image side surface of the third lens satisfy: 1.25<(d3s-d2m) / (DT32-DT31)<4.55.

[0021] Applying the technical solution of the present invention, an optical lens includes a lens barrel, a lens group and a spacer element group disposed in the lens barrel. The lens group consists of seven lenses. Along the optical axis direction from the object side to the image side, the lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has a positive optical power. The object side surface of the first lens is convex, and the image side surface of the first lens is concave. The object side surface of the second lens is convex, and the image side surface of the second lens is concave. The object side surface of the third lens is convex. The object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave. The seventh lens has a negative optical power. The object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave. The spacer element group includes at least a first spacer element. The first spacer element is located between the first lens and the second lens and is in partial contact with the image side surface of the first lens. The aperture number Fno of the optical lens satisfies: 1.15 < Fno ≤ 1.30. The inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, and the effective focal length f of the optical lens satisfy: 0.30 < (d0m - d0s) / f ≤ 0.70. The spacer distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element in the optical axis direction, the central thickness CT1 of the first lens on the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 0.95 < EP01 / (CT1 + T12) < 1.25.

[0022] The optical lens of the present application is composed of a lens barrel, seven lenses and at least one spacer element, and satisfies 1.15 < Fno ≤ 1.30; 0.30 < (d0m - d0s) / f ≤ 0.70. The optical lens in the present application is a large-aperture lens. The ratio of the difference between the inner diameter of the image side end surface of the lens barrel and the inner diameter of the object side end surface of the lens barrel to the effective focal length of the optical lens determines the degree of light blocking of the object side end of the lens barrel and then determines the light incident amount of the first lens. Under the condition of a large-aperture lens, when the first lens has a large light incident amount, the first lens bears more light, resulting in a higher sensitivity of the first lens. In the present application, by restricting EP01 / (CT1 + Tl2) within a reasonable range, the front-end structural strength of the lens barrel and the edge thickness of the first lens are ensured, which is beneficial to ensuring the stability of the first lens group standing. At the same time, by controlling the optical path length of the light in the first lens, the influence of the light on the first lens can be effectively weakened, the sensitivity of the first lens can be reduced, and further the sensitivity of the overall optical lens can be reduced. At the same time, by controlling the air gap between the first lens and the second lens, the influence of the air gap on the system sensitivity can be effectively reduced, and the sensitivity of the system can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0024] Figure 1 A dimensioned diagram of an optical lens according to an optional embodiment of the present invention is shown;

[0025] Figure 2 1-1 shows a schematic structural diagram of an optical lens according to embodiment 1 of the present invention;

[0026] Figure 3 Schematic diagram showing the structure of the optical lens of Example 1-2 of the present invention;

[0027] Figure 4 Schematic diagrams showing the structures of optical lenses according to embodiments 1-3 of the present invention are shown;

[0028] Figures 5 to 7 axial chromatic aberration, astigmatism curve, and distortion curve of the optical lens according to the first embodiment of the present invention are respectively shown;

[0029] Figure 8 2-1 shows a schematic structural diagram of an optical lens according to embodiment 2 of the present invention;

[0030] Figure 9 2. A schematic structural diagram of an optical lens according to embodiment 2-2 of the present invention is shown;

[0031] Figure 10 A schematic structural diagram of an optical lens according to Embodiment 2-3 of the present invention is shown;

[0032] Figures 11 to 13 axial chromatic aberration, astigmatism curve, and distortion curve of the optical lens according to the second embodiment of the present invention are respectively shown;

[0033] Figure 14 A schematic structural diagram of an optical lens according to embodiment 3-1 of the present invention is shown;

[0034] Figure 15 A schematic structural diagram of an optical lens according to embodiment 3-2 of the present invention is shown;

[0035] Figure 16 A schematic structural diagram of an optical lens according to embodiment 3-3 of the present invention is shown;

[0036] Figures 17 to 19 axial chromatic aberration, astigmatism curve, and distortion curve of the optical lens of Example 3 of the present invention are respectively shown;

[0037] Figure 20 A graph showing an MTF value drop difference curve of an optical lens according to an optional embodiment of the present invention is shown;

[0038] Figure 21 A graph showing the MTF value drop difference of an optical lens in an example is shown;

[0039] Figure 22 A graph showing the MTF value drop difference of an optical lens in another example is shown. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0042] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0043] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0044] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0045] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to the judgment method of ordinary knowledge in this field, using the positive and negative R value (R refers to the radius of curvature of the paraxial region, usually refers to the R value in the lens database (lens data) in optical software) to determine the convexity and concavity. For the object side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave. For the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex. In this application, the left side is the object side and the right side is the image side.

[0046] To solve the problem in the prior art that the high light incident amount of an optical lens leads to high sensitivity of the first lens, the present invention provides an optical lens.

[0047] As Figures 1 to 19 shown, the optical lens includes a lens barrel, a lens group and a spacer element group disposed in the lens barrel. The lens group consists of seven lenses. Along the optical axis direction from the object side to the image side, the lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has a positive optical power. The object side surface of the first lens is convex, and the image side surface of the first lens is concave. The object side surface of the second lens is convex, and the image side surface of the second lens is concave. The object side surface of the third lens is convex. The object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave. The seventh lens has a negative optical power. The object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave. The spacer element group at least includes a first spacer element. The first spacer element is located between the first lens and the second lens and is in partial contact with the image side surface of the first lens. The f-number Fno of the optical lens satisfies: 1.15 < Fno ≤ 1.30. The inner diameter d0s of the object side end face of the lens barrel, the inner diameter d0m of the image side end face of the lens barrel, and the effective focal length f of the optical lens satisfy: 0.30 < (d0m - d0s) / f ≤ 0.70. The spacing distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer element in the optical axis direction, the central thickness CT1 of the first lens on the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 0.95 < EP01 / (CT1 + T12) < 1.25.

[0048] The optical lens of the present application consists of a lens barrel, seven lenses and at least one spacer element, and satisfies 1.15 < Fno ≤ 1.30; 0.30 < (d0m - d0s) / f ≤ 0.70. The optical lens in the present application is a large-aperture lens, and the ratio of the difference between the inner diameter of the image side end face and the inner diameter of the object side end face of the lens barrel to the effective focal length of the optical lens determines the degree of light blocking of the object side end of the lens barrel and继而 determines the light incident amount of the first lens. Under the condition of a large-aperture lens, when the first lens has a large light incident amount, the first lens bears more light, resulting in a higher sensitivity of the first lens. In the present application, by constraining EP01 / (CT1 + T12) within a reasonable range, the front-end structural strength of the lens barrel and the edge thickness of the first lens are ensured, which is beneficial to ensuring the stability of the first lens assembly. At the same time, by controlling the optical path length of the light in the first lens, the influence of the light on the first lens can be effectively weakened, the sensitivity of the first lens can be reduced, and进而 the sensitivity of the overall optical lens can be reduced. At the same time, by controlling the air gap between the first lens and the second lens, the influence of the air gap on the system sensitivity can be effectively reduced, and the sensitivity of the system can be further reduced.

[0049] In addition, referring to Table 1 below and Figures 20 to 22 As shown Figure 20 Figure 4 shows the MTF value drop difference curve of an optical lens with Fno = 1.2, (d0m - d0s) / f = 0.32, and EP01 / (CT1 + T12) = 1.23. From Figure 20 it can be seen that the MTF drop amount curve on the image side of the first lens almost coincides with the MTF drop amount curve on the object side of the second lens, and only in local positions does the MTF drop amount increase, indicating that the overall MTF drop amount is small, the sensitivity is good, and the change within the evaluation field of view is uniform. Figure 21 Figure 5 shows the MTF value drop difference curve of an optical lens with Fno = 1.2, (d0m - d0s) / f = 0.32, and EP01 / (CT1 + T12) = 1.35. From Figure 21 it can be seen that the MTF drop amount curve on the image side of the first lens and the MTF drop amount curve on the object side of the second lens cross each other, and only at certain positions do the two curves coincide, while at other positions the MTF drop amounts of the two curves are larger, and the MTF drop amount at local positions is even larger, indicating that the overall MTF drop amount is larger and the sensitivity is slightly worse, and the change within the evaluation field of view is disordered. Figure 22 Figure 6 shows the MTF value drop difference curve of an optical lens with Fno = 1.2, (d0m - d0s) / f = 0.32, and EP01 / (CT1 + T12) = 0.63. From Figure 22 it can be seen that the MTF drop amount curve on the image side of the first lens and the MTF drop amount curve on the object side of the second lens gradually separate after the image height is 1.2, and the MTF drop amounts of the two curves are gradually increasing, indicating that the overall MTF drop amount is larger and the sensitivity is poor. From Figures 20 to 22 the comparison, it can be seen that when the optical lens satisfies 0.95 < EP01 / (CT1 + T12) < 1.25, the MTF drop amount is less, while when EP01 / (CT1 + T12) in the optical lens is less than 0.95 or greater than 1.25, the MTF drop amount increases significantly, indicating that when the optical lens satisfies 0.95 < EP01 / (CT1 + T12) < 1.25, the MTF drop amount between the image side of the first lens and the object side of the second lens is small, indicating that the sensitivity of the first lens and the second lens is low, thereby improving the sensitivity of the optical lens.

[0050] Among them, in the MTF value drop difference curve graph, the abscissa is the image height and the ordinate is the MTF drop amount. At the same image height, if the ordinate of the MTF drop amount on the image side of the first lens is 0.1 and the ordinate of the MTF drop amount on the object side of the second lens is -0.1, it means that the MTF drop amount from the image side of the first lens to the object side of the second lens is 0.2. Under the condition of the same tolerance, the smaller the MTF drop amount from the image side of the first lens to the object side of the second lens, the lower the system sensitivity, indicating better sensitivity.

[0051] Table 1

[0052]

[0053] Among them, the MTF value drop amount refers to: the decline amplitude of the MTF value relative to its peak value or reference value at different image heights.

[0054] It should be noted that this application limits EP01 / (CT1+T12) within a reasonable range, controls the optical path length of light in the first lens, can effectively weaken the influence of light on the first lens, reduce the sensitivity of the first lens, and further reduce the overall sensitivity of the optical lens, so as to solve the sensitivity problem brought about when Fno is within the range of 1.15 to 1.3 and (d0m-d0s) / f is within the range of 0.3 to 0.7. When EP01 / (CT1+T12) is within the above range, the problem of reducing sensitivity can be achieved, and it does not depend on the optical power and surface shape of other lenses. The optical power and surface shape of other lenses are further optimizations of the optical lens on this basis. Each lens can be positive or negative according to the actual design requirements of the optical lens, and the surface shape of each lens can also be convex or concave according to the design requirements of the optical lens. When the optical lens satisfies: 1.15 < Fno ≤ 1.30; 0.30 < (d0m-d0s) / f ≤ 0.70; 0.95 < EP01 / (CT1+T12) < 1.25, the optical lens can reduce the influence of stray light while meeting the aberration requirements.

[0055] For example, in some optional embodiments, the first lens has a positive focal power. By constraining the first lens to have a positive focal power, it is beneficial for large-angle light rays to converge into the optical lens, which is conducive to increasing the light flux. Also, for example, in some embodiments, the seventh lens has a negative focal power, which can balance the aberration brought by the front system and appropriately diverge the light rays transmitted to the imaging surface. Also, for example, in some optional embodiments, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the object side surface of the third lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave; the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave. The optical lens can be simulated through software and / or tools such as ZEMAX, CODEV, etc. Preferably, the optical lens can be simulated through CODEV. During the simulation process using software and / or tools such as those described above, the surface profiles of each lens can be simulated according to the built-in surface profiles of the software and / or tools used and adjusted appropriately.

[0056] In some optional embodiments, the inner diameter d0s of the object side end face of the lens barrel and the maximum effective radius DT11 of the object side surface of the first lens satisfy: 2.85 < d0s / DT11 < 3.30. By constraining d0s / DT11 within a reasonable range, the opening size of the object side end face of the lens barrel can be effectively controlled, while ensuring the structural strength of the object side of the lens barrel and taking into account that the imaging light rays will not be blocked by the lens barrel, ensuring that the imaging light rays can smoothly enter the optical effective area of the first lens, and at the same time ensuring the structural strength of the lens barrel to ensure the stability of the lens assembly.

[0057] In some optional embodiments, the first lens has a positive focal power. The effective focal length f1 of the first lens and the spacing distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer element in the optical axis direction satisfy: 5.35 < f1 / EP01 < 7.50. By constraining f1 / EP01 within a reasonable range, the focal power of the first lens can be effectively controlled, thereby reducing the sensitivity of the first lens, and at the same time constraining the edge thickness of the first lens, reducing the internal reflection path in the first lens, which is thus conducive to improving the imaging quality of the optical lens.

[0058] In some optional embodiments, the image side of the first lens is concave, and the following relationship is satisfied among the radius of curvature R2 of the image side of the first lens, the outer diameter D1s of the object side of the first spacer element, and the inner diameter d1s of the object side of the first spacer element: 2.60 < R2 / (D1s - d1s) < 15.70. By controlling R2 / (D1s - d1s) within a reasonable range, the shape of the image side of the first lens can be ensured, thereby reducing the sensitivity caused by the shape error of the image side of the first lens, further reducing the sensitivity of the first lens. Constraining the inner and outer diameter dimensions of the first spacer element can effectively control the ray height at the first spacer element, and at the same time ensure the assembly stability between the first spacer element and the first lens, further reducing the sensitivity of the optical lens.

[0059] In some optional embodiments, the following relationship is satisfied between the effective focal length f2 of the second lens and the inner diameter d1m of the image side of the first spacer element: -11.00 ≤ f2 / d1m ≤ 17.75. By constraining f2 / d1m within a reasonable range, the distribution of the optical power of the second lens can be ensured, thereby reducing the sensitivity of the second lens, controlling the ray height entering the second lens, optimizing the ray transmission path, reducing the generation of marginal stray light, being beneficial to ensuring the imaging quality of the optical lens, and at the same time constraining the front-end external dimension of the optical lens.

[0060] In some optional embodiments, the following relationship is satisfied between the maximum thickness CP1 of the first spacer element in the optical axis direction and the air gap T12 between the first lens and the second lens on the optical axis: 0.05 < CP1 / T12 < 0.45. By constraining CP1 / T12 within a reasonable range, the spacing distance between the first lens and the second lens can be controlled. At the same time, by providing the first spacer element, it can effectively prevent the first lens and the second lens from being scratched in the reliability experiment, ensuring the reliability of the optical lens.

[0061] In some optional embodiments, the following relationship is satisfied between the inner diameter d1s of the object side of the first spacer element and the central thickness CT1 of the first lens on the optical axis: 3.65 ≤ d1s / CT1 < 4.05. By constraining d1s / CT1 within a reasonable range, the first lens can be effectively controlled to have a reasonable effective diameter and central thickness, thereby controlling the shape and size of the first lens, which is beneficial to the injection molding debugging and demolding of the first lens.

[0062] In some optional embodiments, the object side surface of the third lens is convex, and the following relationship is satisfied among the effective focal length f3 of the third lens, the radius of curvature R5 of the object side surface of the third lens, and the radius of curvature R6 of the image side surface of the third lens: -13.95 < f3 / (R5 + R6) ≤ 0.35. By constraining f3 / (R5 + R6) within a reasonable range, the optical power distribution of the third lens can be effectively controlled, thereby reducing the decentration sensitivity of the third lens. At the same time, the radii of curvature of the object side surface and the image side surface of the third lens are controlled to control the shape of the third lens and reduce the shape error sensitivity, and further reduce the sensitivity of the optical lens.

[0063] In some optional embodiments, the following relationship is satisfied between the distance L from the object side end face of the lens barrel to the image side end face of the lens barrel and the spacing distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer element in the optical axis direction: 4.70 < L / EP01 < 5.30. By controlling L / EP01 within a reasonable range, the total length of the optical lens can be effectively controlled, and at the same time, the edge thickness of the first lens can be limited. While ensuring the structural strength of the first lens, the angular aperture of the first lens can be effectively reduced, further reducing the sensitivity of the first lens, and thus reducing the sensitivity of the optical lens.

[0064] In some optional embodiments, the spacer element group further includes a second spacer element. The second spacer element is located between the second lens and the third lens and is partially in contact with the image side surface of the second lens. The following relationship is satisfied between the spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction and the center thickness CT2 of the second lens on the optical axis: 1.40 < EP12 / CT2 ≤ 2.80. By constraining EP12 / CT2 within a reasonable range, the center thickness and the edge thickness of the second lens can be constrained, effectively avoiding light rays with large-angle deflections, improving the MTF quality of the optical lens, and reducing the sensitivity of the optical lens.

[0065] In some optional embodiments, the spacer element group further includes a second spacer element. The second spacer element is located between the second lens and the third lens and is partially in contact with the image side surface of the second lens. The following relationship is satisfied between the spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction and the air gap T23 between the second lens and the third lens on the optical axis: 0.85 < EP12 / T23 < 1.65. By controlling EP12 / T23 within a reasonable range, the edge thickness of the second lens can be effectively controlled to ensure the structural strength of the second lens. At the same time, the air gap between the second lens and the third lens is constrained, reducing the sensitivity caused by the change in the gap between the second lens and the third lens while ensuring sufficient arrangement space for the second spacer element.

[0066] In some optional embodiments, the image side surface of the second lens is concave, the object side surface of the third lens is convex, the spacer element group further includes a second spacer element, the second spacer element is located between the second lens and the third lens and is in partial contact with the image side surface of the second lens, and the following relationship is satisfied among the inner diameter d2s of the object side surface of the second spacer element, the inner diameter d2m of the image side surface of the second spacer element, the radius of curvature R4 of the image side surface of the second lens, and the radius of curvature R5 of the object side surface of the third lens: 1.05 < d2s / R4 + d2m / R5 < 1.25. By controlling d2s / R4 + d2m / R5 within a reasonable range, the deflection angle of light on the image side surface of the second lens and the deflection angle of light on the object side surface of the third lens can be controlled, so that the light is transmitted along a preset path, reducing the shape error sensitivity of the image side surface of the second lens and the object side surface of the third lens, and ensuring the imaging stability of the optical lens.

[0067] In some optional embodiments, the spacer element group further includes a second spacer element, the second spacer element is located between the second lens and the third lens and is in partial contact with the image side surface of the second lens, and the following relationship is satisfied among the spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction, the inner diameter d1m of the image side surface of the first spacer element, and the inner diameter d2s of the object side surface of the second spacer element: 0.25 ≤ EP12 / d1m + EP12 / d2s < 0.45. By constraining EP12 / d1m + EP12 / d2s within a reasonable range, the height of the light passing through the first spacer element and the second spacer element can be effectively controlled, indirectly constraining the deflection angle of the light at the second lens, so as to ensure a smooth transition of the light at the second lens. At the same time, the light path trend can be constrained, which is beneficial to constraining the effective diameter size of the second lens and is beneficial to controlling the shape of the optical lens.

[0068] In some optional embodiments, the spacer element group further includes a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and is in partial contact with the image side surface of the second lens, the third spacer element is located between the third lens and the fourth lens and is in partial contact with the image side surface of the third lens, and the following relationship is satisfied among the inner diameter d2m of the image side surface of the second spacer element, the inner diameter d3s of the object side surface of the third spacer element, the maximum effective radius DT31 of the object side surface of the third lens, and the maximum effective radius DT32 of the image side surface of the third lens: 1.25 < (d3s - d2m) / (DT32 - DT31) < 4.55. By constraining (d3s - d2m) / (DT32 - DT31) within a reasonable range, the deflection angles of light on the object side surface and the image side surface of the third lens can be controlled, which is beneficial to the light passing smoothly through the second spacer element, the third lens, and the third spacer element to reach the fourth lens. If the effective apertures of the object side surface and the image side surface of the third lens are further constrained to be close, it is more beneficial to reduce the propagation optical path of the light in the third lens and further improve the optical performance.

[0069] In another embodiment of the present invention, the optical lens includes a lens barrel, a lens group, and a spacer element group disposed within the lens barrel. The lens group consists of seven lenses. Along the optical axis direction from the object side to the image side, the lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has a positive optical power. The spacer element group at least includes a first spacer element. The first spacer element is located between the first lens and the second lens and is partially in contact with the image side surface of the first lens. The f-number Fno of the optical lens satisfies: 1.15 < Fno ≤ 1.30. The inner diameter d0s of the object side end face of the lens barrel, the inner diameter d0m of the image side end face of the lens barrel, and the effective focal length f of the optical lens satisfy: 0.30 < (d0m - d0s) / f ≤ 0.70. The distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer element in the optical axis direction, the effective focal length f1 of the first lens, and the distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer element in the optical axis direction satisfy: 5.35 < f1 / EP01 < 7.50.

[0070] The optical lens of the present application is composed of a lens barrel, seven lenses, and at least one spacer element, and satisfies 1.15 < Fno ≤ 1.30; 0.30 < (d0m - d0s) / f ≤ 0.70. The optical lens in the present application is a large-aperture lens. The ratio of the difference between the inner diameter of the image side end face and the inner diameter of the object side end face of the lens barrel to the effective focal length of the optical lens determines the degree of light blocking of the object side end of the lens barrel and then determines the light incident amount of the first lens. Under a large-aperture lens, when the first lens has a large light incident amount, the first lens bears more light, resulting in a higher sensitivity of the first lens. In this embodiment, by restricting f1 / EP01 within a reasonable range, the optical power of the first lens can be effectively controlled, the sensitivity of the first lens can be reduced, and at the same time, EP01 is restricted to ensure the structural strength of the front end of the lens barrel and the edge thickness of the first lens, which is beneficial to ensuring the stability of the erection of the first lens group. Furthermore, the sensitivity caused by the manufacturing error at the front end of the lens barrel and the edge position of the first lens can be reduced, the sensitivity of the first lens can be reduced, and then the overall sensitivity of the optical lens can be reduced. At the same time, the edge thickness of the first lens is restricted, the internal light reflection path in the first lens is reduced, and then the influence of stray light on the sensitivity is reduced, further reducing the sensitivity of the optical lens.

[0071] According to another aspect of the present invention, an optical lens is provided, which includes a lens barrel, a lens group and a spacer element group disposed in the lens barrel. The lens group consists of seven lenses. Along the optical axis direction from the object side to the image side, the lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has a positive optical power; the spacer element group at least includes a first spacer element, and the first spacer element is located between the first lens and the second lens and is partially in contact with the image side surface of the first lens; the aperture number Fno of the optical lens satisfies: 1.15 < Fno ≤ 1.30; the inner diameter d0s of the object-side end surface of the lens barrel and the maximum effective radius DT11 of the object-side surface of the first lens satisfy: 2.85 < d0s / DT11 < 3.30; the curvature radius R1 of the object-side surface of the first lens, the refractive index N1 of the first lens, and the inner diameter d1s of the object-side surface of the first spacer element satisfy: 1.05 < R1 * N1 / d1s < 1.35.

[0072] In this embodiment, the optical lens is composed of a lens barrel, seven lenses and at least one spacer element. When the optical lens satisfies: 1.15 < Fno ≤ 1.30; 2.85 < d0s / DT11 < 3.30, the optical lens has the characteristics of a large aperture and a large light transmission amount. When the inner diameter of the object-side end surface of the lens barrel is larger than the maximum effective radius of the object-side surface of the first lens, more light enters the first lens. However, the object-side surface of the first lens cannot effectively converge some large-angle light rays, resulting in serious stray light. In order to reduce the generation of such stray light, in this embodiment, R1 * N1 / d1s is constrained within a reasonable range to ensure that the light rays are quickly converged after entering the object-side surface of the first lens, so as to reduce the stray light deflected to the optical structure area of the first lens. At the same time, by constraining the inner diameter of the object-side surface of the first spacer element, the light rays deflected to the optical structure area of the first lens can be blocked, further reducing the stray light transmitted to the rear optical lens and improving the imaging quality of the optical lens.

[0073] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0074] Optionally, the above optical lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0075] The optical lens in this application may utilize multiple lenses, such as the seven lenses described above. In this application, at least one of the lens surfaces is an aspheric surface. An aspheric lens is characterized by a continuously varying curvature from the center of the lens to the periphery. Unlike a spherical lens, which has a constant curvature from the center to the periphery, an aspheric lens has a better curvature radius characteristic, with the advantages of improving distortion aberration and astigmatism. By utilizing an aspheric lens, aberrations that occur during imaging can be eliminated as much as possible, thereby improving imaging quality.

[0076] However, those skilled in the art will appreciate that the number of lenses comprising the optical lens can be varied to achieve the various results and advantages described herein without departing from the technical solutions claimed herein. For example, although the embodiments describe an optical lens using seven lenses as an example, the optical lens is not limited to including seven lenses. If desired, the optical lens can also include other numbers of lenses.

[0077] Figure 1 A schematic diagram of the dimensions of an optical lens of the present application is shown. Figure 1 Parameters such as d1s, d1m, D1s, d2s, d2m, d3s, d0s, d0m, CP1, EP01, EP12, and L are indicated in the figure to clearly and intuitively understand the significance of the parameters. For the convenience of describing the surface of the optical lens and the specific lens, these parameters will no longer be reflected in the accompanying drawings when describing the specific embodiments later. The object-side surface of the spacer element in this application refers to the surface on which the spacer element is located most on the object side and perpendicular to the optical axis, and the image-side surface of the spacer element refers to the surface on which the spacer element is located most on the image side and perpendicular to the optical axis, the object-side end surface of the lens barrel refers to the surface on which the lens barrel is located most on the object side and perpendicular to the optical axis, and the image-side end surface of the lens barrel refers to the surface on which the lens barrel is located most on the image side and perpendicular to the optical axis.

[0078] The following further describes examples of specific surface shapes and parameters of the optical lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0079] It should be noted that in the following Example 1, there are Examples 1-1, 1-2, and 1-3; in Example 2, there are Examples 2-1, 2-2, and 2-3; and in Example 3, there are Examples 3-1, 3-2, and 2-3. While the parameters such as the radius of curvature, center thickness, and spacing between lenses, as well as the higher-order coefficients, of the optical lenses of the three embodiments within the same embodiment are identical, the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first, second, and third spacers, as well as the shapes of some lenses, are different. In other words, the primary imaging structure is the same, while the auxiliary imaging structures are different.

[0080] It should be noted that any one of the following embodiments 1 to 3 is applicable to this application.

[0081] Example 1

[0082] like Figures 2 to 7 As shown, the optical lens of embodiment 1 is described. Figure 2 1-1 shows a schematic structural diagram of the optical lens of Example 1-1. Figure 3 Schematic diagram of the structure of the optical lens of Example 1-2 is shown. Figure 4 Schematic diagrams of the structures of the optical lenses of Examples 1-3 are shown.

[0083] like Figures 2 to 4 As shown, the optical lens includes a lens barrel, seven lenses and multiple spacer elements. The lens barrel includes a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, and a seventh spacer element P7, which are arranged in sequence from the object side to the image side.

[0084] like Figure 2 1-1. The structure diagram of the optical lens of Example 1-1 is shown. In this example, the object-side surface S1 of the first lens element partially contacts the lens barrel. The object-side surface and image-side surface of the first spacer element partially contact the image-side surface S2 of the first lens element and the object-side surface S3 of the second lens element, respectively. The object-side surface and image-side surface of the second spacer element partially contact the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object-side surface and image-side surface of the third spacer element partially contact the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, respectively. The object-side surface and image-side surface of the fourth spacer element partially contact the image-side surface S8 of the fourth lens element and the object-side surface S9 of the fifth lens element, respectively. The object-side surface and image-side surface of the fifth spacer element partially contact the image-side surface S10 of the fifth lens element and the object-side surface S11 of the sixth lens element, respectively. The object-side surface and image-side surface of the sixth spacer element partially contact the image-side surface S12 of the sixth lens element and the object-side surface S13 of the seventh lens element, respectively. The object-side surface of the seventh spacer element partially contacts the image-side surface S14 of the seventh lens element.

[0085] like Figure 3 FIG2 is a schematic structural diagram of the optical lens of Example 1-2. The optical lens further includes a third auxiliary spacer element P3b, which is positioned between the third spacer element and the fourth lens. The object-side surface and image-side surface of the third auxiliary spacer element partially contact the image-side surface of the third spacer element and the object-side surface S7 of the fourth lens, respectively. The abutment and contacting arrangements of the other spacer elements are similar to those of Example 1-1. The relevant descriptions in Example 1-1 may be referred to and are not further elaborated here.

[0086] like Figure 4 FIG2 is a schematic structural diagram of the optical lens of Example 1-3. The optical lens further includes a third auxiliary spacer element P3b, which is positioned between the third spacer element and the fourth lens. The object-side surface and image-side surface of the third auxiliary spacer element partially contact the image-side surface of the third spacer element and the object-side surface S7 of the fourth lens, respectively. The abutment and contacting arrangements of the other spacer elements are similar to those of Example 1-1. The relevant descriptions in Example 1-1 may be referred to and are not further elaborated here.

[0087] In summary, the structural parameters of the optical lens of Example 1 in Example 1-1, Example 1-2, and Example 1-3 are shown in Table 9.

[0088] In Example 1, the first lens has positive focal power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The second lens has negative focal power, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The third lens has positive focal power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The fourth lens has negative focal power, the object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is convex. The fifth lens has positive focal power, the object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is concave. The sixth lens has positive focal power, the object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave. The seventh lens has negative focal power, the object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave.

[0089] Table 2 shows the basic structural parameters of the optical lens of Example 1, wherein the units of curvature radius, thickness, and effective radius are all in millimeters (mm).

[0090] Table 2

[0091]

[0092] In Example 1, the object-side surface and the image-side surface of the first lens E1 to the seventh lens E7 are all aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0093] Formula (1)

[0094] Where x is the distance vector from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R, i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; and Ai is the correction coefficient for the i-th order of the aspheric surface. Table 3 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspheric mirror surface S1-S14 in Example 1.

[0095] Table 3

[0096]

[0097] Figure 5 The axial chromatic aberration curve of the optical lens of Example 1 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical lens. Figure 6 The astigmatism curve of the optical lens of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 7 The distortion curve of the optical lens of Example 1 is shown, which represents the distortion values corresponding to different field angles.

[0098] according to Figures 5 to 7 It can be seen that the optical lens provided in Example 1 can achieve good imaging quality.

[0099] Example 2

[0100] like Figures 8 to 13 As shown, the optical lens of the second embodiment is described. Figure 8 2-1 shows a schematic structural diagram of the optical lens of Example 2-1. Figure 9 2-2 shows a schematic structural diagram of the optical lens of Example 2-2. Figure 10 A schematic structural diagram of the optical lens of Example 2-3 is shown.

[0101] like Figures 8 to 10 As shown, the optical lens includes a lens barrel, seven lenses and multiple spacer elements. The lens barrel includes, arranged from the object side to the image side, a first lens E1, a first spacer element P1, a first auxiliary spacer element P1b, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a sixth auxiliary spacer element P6b, a sixth auxiliary spacer element P6c, a seventh lens E7 and a seventh spacer element P7.

[0102] like Figure 8, which is a schematic structural diagram of the optical lens of Example 2-1. In this example, the optical lens further includes a first auxiliary spacer element P1c. The object-side surface S1 of the first lens element partially contacts the lens barrel. The object-side surface and image-side surface of the first spacer element partially contact the image-side surface S2 of the first lens element and the object-side surface of the first auxiliary spacer element, respectively. The object-side surface and image-side surface of the first auxiliary spacer element partially contact the image-side surface S3 of the second lens element, respectively. The object-side surface and image-side surface of the second spacer element partially contact the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object-side surface and image-side surface of the third spacer element partially contact the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, respectively. The object-side surface and image-side surface of the fourth spacer element partially contact the image-side surface S8 of the fourth lens element and the object-side surface S9 of the fifth lens element, respectively. The object-side surface and image-side surface of the fifth spacer element partially contact the image-side surface S10 of the fifth lens element and the object-side surface S11 of the sixth lens element, respectively. The object-side surface and image-side surface of the sixth spacer element partially contact the image-side surface S12 of the sixth lens element and the object-side surface of the sixth auxiliary spacer element, respectively. The object-side surface and image-side surface of the sixth auxiliary spacer element partially contact the image-side surface of the sixth auxiliary spacer element and the object-side surface S13 of the seventh lens element, respectively. The object-side surface of the seventh spacer element partially contacts the image-side surface S14 of the seventh lens element.

[0103] like Figure 9 FIG2 is a schematic diagram of the structure of the optical lens of Example 2-2. The optical lens further includes a first auxiliary spacer element P1c. The supporting and abutting manner of each spacer element in this embodiment is similar to that of Example 2-1. Please refer to the relevant description of Example 2-1 and will not be repeated here.

[0104] like Figure 10 FIG2 is a schematic diagram of the structure of the optical lens of Example 2-3. The image-side surface of the first auxiliary spacer element is in direct contact with the object-side surface S3 of the second lens. The supporting and abutting manner of the other spacer elements is similar to that of Example 2-1. Please refer to the relevant description of Example 2-1 and will not be repeated here.

[0105] In summary, the structural parameters of the optical lens of Example 2 in Example 2-1, Example 2-2, and Example 2-3 are shown in Table 9.

[0106] In Example 2, the first lens has positive focal power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The second lens has positive focal power, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The third lens has negative focal power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave. The fourth lens has positive focal power, the object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The fifth lens has negative focal 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 has positive focal power, the object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave. The seventh lens has negative focal power, the object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave.

[0107] Table 4 shows the basic structural parameters of the optical lens of Example 2, wherein the units of the curvature radius, thickness, and effective radius are all in millimeters (mm).

[0108] Table 4

[0109]

[0110] Table 5 shows the high-order coefficients of the various aspheric mirror surfaces that can be used in Example 2, where the surface shapes of the various aspheric surfaces can be defined by formula (1) given in Example 1. In this embodiment, the object-side and image-side surfaces of the first to seventh lenses are all aspheric surfaces.

[0111] Table 5

[0112]

[0113] Figure 11 The axial chromatic aberration curve of the optical lens of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical lens. Figure 12 The astigmatism curve of the optical lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 13 The distortion curve of the optical lens of Example 2 is shown, which represents the distortion values corresponding to different field angles.

[0114] according to Figures 11 to 13 It can be seen that the optical lens provided in the second embodiment can achieve good imaging quality.

[0115] Example 3

[0116] like Figures 14 to 19 As shown, the optical lens of embodiment 3 is described. Figure 14 Schematic diagram of the structure of the optical lens of Example 3-1 is shown. Figure 15Schematic diagram of the structure of the optical lens of Example 3-2 is shown. Figure 16 A schematic structural diagram of the optical lens of Example 3-3 is shown.

[0117] like Figures 14 to 16 As shown, the optical lens includes a lens barrel, seven lenses and multiple spacer elements. The lens barrel includes, arranged from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a sixth auxiliary spacer element P6b, a seventh lens E7, and a seventh spacer element P7.

[0118] like Figure 14 , which is a schematic structural diagram of the optical lens of Example 3-1. In this example, the object-side surface S1 of the first lens element partially contacts the lens barrel. The object-side surface and image-side surface of the first spacer element partially contact the image-side surface S2 of the first lens element and the object-side surface S3 of the second lens element, respectively. The object-side surface and image-side surface of the second spacer element partially contact the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object-side surface and image-side surface of the third spacer element partially contact the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, respectively. The object-side surface and image-side surface of the fourth spacer element partially contact the image-side surface S8 of the fourth lens element and the object-side surface of the fourth auxiliary spacer element, respectively. The image-side surface of the fourth auxiliary spacer element partially contacts the object-side surface S9 of the fifth lens element. The object-side surface and image-side surface of the fifth spacer element partially contact the image-side surface S10 of the fifth lens element and the object-side surface S11 of the sixth lens element, respectively. The object-side surface and image-side surface of the sixth spacer element partially contact the image-side surface S12 of the sixth lens element and the object-side surface of the sixth auxiliary spacer element, respectively. The image-side surface of the sixth auxiliary spacer element partially contacts the object-side surface S13 of the seventh lens element. The object-side surface of the seventh spacer element is in partial contact with the image-side surface S14 of the seventh lens.

[0119] like Figure 15 FIG3 is a schematic diagram of the structure of the optical lens of Example 3-2. In this embodiment, the supporting and abutting manner of each spacer element is similar to that of Example 3-1, and the relevant description in Example 3-1 can be referred to and will not be repeated here.

[0120] like Figure 16 FIG3 is a schematic diagram of the structure of the optical lens of Example 3-3. In this embodiment, the supporting and abutting manner of each spacer element is similar to that of Example 3-1, and the relevant description in Example 3-1 can be referred to and will not be repeated here.

[0121] In summary, the structural parameters of the optical lens of Example 3 in Example 3-1, Example 3-2, and Example 3-3 are shown in Table 9.

[0122] In Example 3, the first lens has positive focal power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The second lens has negative focal power, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The third lens has positive focal power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The fourth lens has negative focal power, the object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The fifth lens has positive focal 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 has negative focal power, the object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave. The seventh lens has negative focal power, the object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave.

[0123] Table 6 shows the basic structural parameters of the optical lens of Example 3, wherein the units of the curvature radius, thickness, and effective radius are all in millimeters (mm).

[0124] Table 6

[0125]

[0126] Table 7 shows the high-order coefficients of the various aspheric mirror surfaces that can be used in Example 3, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1. In this embodiment, the object-side and image-side surfaces of the first to seventh lenses are all aspheric surfaces.

[0127] Table 7

[0128]

[0129] Figure 17 The axial chromatic aberration curve of the optical lens of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical lens. Figure 18 The astigmatism curve of the optical lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 19 The distortion curve of the optical lens of Example 3 is shown, which represents the distortion values corresponding to different field angles.

[0130] according to Figures 17 to 19 It can be seen that the optical lens provided in Example 3 can achieve good imaging quality.

[0131] In summary, the optical lenses of Examples 1 to 3 respectively satisfy the relationships shown in Table 8.

[0132] Table 8

[0133]

[0134] Table 9 shows some parameters of the optical lenses of Examples 1 to 3 (unit: mm).

[0135] Table 9

[0136]

[0137] This application also provides an imaging device, whose electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0138] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0139] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0140] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0141] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An optical lens, characterized in that: The lens barrel comprises a lens group and a spacer element group arranged in the lens barrel. The lens group is composed of seven lenses, and the lens group includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens has positive refractive power, the object-side surface of the first lens is convex, and the image-side surface of the first lens is concave, the object-side surface of the second lens is convex, and the image-side surface of the second lens is concave, the object-side surface of the third lens is convex, the object-side surface of the sixth lens is convex, and the image-side surface of the sixth lens is concave, and the seventh lens has negative refractive power, the object-side surface of the seventh lens is convex, and the image-side surface of the seventh lens is concave; The spacer element group includes at least a first spacer element, the first spacer element is located between the first lens and the second lens and is in contact with the image-side surface of the first lens; The aperture number Fno of the optical lens meets the following requirements: 1.15 <Fno≤1.30; The inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, and the effective focal length f of the optical lens satisfy the following conditions: 0.30<(d0m-d0s) / f≤0.70; The distance EP01 between the object side end face of the lens barrel and the object side face of the first spacer element in the optical axis direction, the center thickness CT1 of the first lens on the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following conditions: 0.95 <EP01 / (CT1+T12)<1.25。 2. The optical lens according to claim 1, wherein: The inner diameter d0s of the object side end surface of the lens barrel and the maximum effective radius DT11 of the object side surface of the first lens satisfy the following conditions: 2.85 <d0s / DT11<3.30。 3. The optical lens according to claim 1, wherein: The effective focal length f1 of the first lens, the distance EP01 between the object side end face of the lens barrel and the object side face of the first spacer element in the optical axis direction satisfy: 5.35 <f1 / EP01<7.50。 4. The optical lens according to claim 1, wherein: The curvature radius R2 of the image side surface of the first lens, the outer diameter D1s of the object side surface of the first spacer element, and the inner diameter d1s of the object side surface of the first spacer element satisfy the following relationship: 2.60 <R2 / (D1s-d1s)<15.70。 5. The optical lens according to claim 1, wherein: The effective focal length f2 of the second lens and the inner diameter d1m of the image-side surface of the first spacer element satisfy the following: -11.00≤f2 / d1m≤17.

75.

6. The optical lens according to claim 1, wherein: The maximum thickness CP1 of the first spacer element in the optical axis direction and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following conditions: 0.05 <CP1 / T12<0.45。 7. The optical lens according to claim 1, wherein: An inner diameter d1s of the object-side surface of the first spacer element and a center thickness CT1 of the first lens on the optical axis satisfy the following: 3.65≤d1s / CT1<4.

05.

8. The optical lens according to claim 1, wherein: The effective focal length f3 of the third lens, the curvature radius R5 of the object side surface of the third lens, and the curvature radius R6 of the image side surface of the third lens satisfy the following conditions: -13.95 <f3 / (R5+R6)≤0.35。 9. The optical lens according to claim 1, wherein: The distance L between the object side end face of the lens barrel and the image side end face of the lens barrel, and the spacing distance EP01 between the object side end face of the lens barrel and the object side face of the first spacing element in the optical axis direction satisfy: 4.70 <L / EP01<5.30。 10. The optical lens according to any one of claims 1 to 9, characterized in that: The spacer element group further includes a second spacer element, which is located between the second lens and the third lens and contacts the image side surface portion of the second lens. The spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction and the center thickness CT2 of the second lens on the optical axis satisfy the following conditions: 1.40 <EP12 / CT2≤2.80。 11. The optical lens according to any one of claims 1 to 9, characterized in that: The spacer element group further includes a second spacer element, the second spacer element is located between the second lens and the third lens and contacts the image side surface portion of the second lens, and the spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction and the air spacing T23 between the second lens and the third lens on the optical axis satisfy the following conditions: 0.85 <EP12 / T23<1.65。 12. The optical lens according to any one of claims 1 to 9, characterized in that: The spacer element group further includes a second spacer element, the second spacer element is located between the second lens and the third lens and is in contact with the image side surface of the second lens, and the inner diameter d2s of the object side surface of the second spacer element, the inner diameter d2m of the image side surface of the second spacer element, the curvature radius R4 of the image side surface of the second lens, and the curvature radius R5 of the object side surface of the third lens satisfy the following relationship: 1.05 <d2s / R4+d2m / R5<1.25。 13. The optical lens according to any one of claims 1 to 9, characterized in that: The spacer element group also includes a second spacer element, which is located between the second lens and the third lens and contacts the image side surface of the second lens. The spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction, the inner diameter d1m of the image side surface of the first spacer element, and the inner diameter d2s of the object side surface of the second spacer element satisfy the following: 0.25≤EP12 / d1m+EP12 / d2s<0.

45.

14. The optical lens according to any one of claims 1 to 9, characterized in that: The spacer element group also includes a second spacer element and a third spacer element. The second spacer element is located between the second lens and the third lens and contacts the image side surface of the second lens. The third spacer element is located between the third lens and the fourth lens and contacts the image side surface of the third lens. The inner diameter d2m of the image side surface of the second spacer element, the inner diameter d3s of the object side surface of the third spacer element, the maximum effective radius DT31 of the object side surface of the third lens, and the maximum effective radius DT32 of the image side surface of the third lens satisfy the following conditions: 1.25<(d3s-d2m) / (DT32-DT31)<4.55.

Images