Optical focusing lens

Abstract

The invention provides an optical focusing lens. The optical focusing lens comprises a first lens barrel and a second lens barrel which are sequentially arranged from an object side to an image side along an optical axis; the first lens barrel is fixedly provided with a fixed lens group with positive focal power, and sequentially comprises a first lens with positive focal power, a second lens with focal power, a third lens with negative focal power and a fourth lens with positive focal power from an object side to an image side along an optical axis; the second lens barrel is fixedly provided with a focusing lens group with negative focal power, and the focusing lens group is movably arranged along the optical axis relative to the fixed lens group; the focusing lens group sequentially comprises a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with positive focal power and an eighth lens with negative focal power from the object side to the image side along the optical axis; the optical focusing lens satisfies the following relational expressions: 1.5 < f / Tw < 1.9; and fi / F2 is more than-2.0 and less than-1.3.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to an optical focusing lens. Background Art

[0002] In recent years, with the rapid development of science and technology, the market has put forward more new demands for cameras suitable for electronic products, especially some professional cameras used by photographers. Usually, when using a fixed-point focus camera, photographers generally focus on the center or other specific positions, but this only applies to static objects or scenery. However, in some cases of shooting dynamic objects, the focus function of this fixed-point focus camera is not powerful enough and often cannot be used with ease. This is because the fixed-point hovering time of dynamic objects is too short, and the focus time of existing cameras is relatively long, and it may still not be able to capture the object well when focusing on a single point; therefore, how to complete the focus in time becomes extremely important. Summary of the invention

[0003] An advantage of the present invention is that it provides an optical focusing lens that can achieve accurate and fast autofocus effects in different shooting environments, which is beneficial to improving the shooting experience.

[0004] In order to achieve the above advantages or other advantages and purposes of the present invention, the present invention provides an optical focusing lens, comprising a first lens barrel and a second lens barrel arranged in sequence from the object side to the image side along the optical axis:

[0005] The first lens barrel is fixedly equipped with a fixed lens group with positive optical power, which includes a first lens with positive optical power, a second lens with optical power, a third lens with negative optical power and a fourth lens with positive optical power in order from the object side to the image side along the optical axis; the object side surface and the image side surface of the second lens are convex and concave respectively, the image side surface of the third lens is concave; the object side surface and the image side surface of the fourth lens are both convex; and

[0006] The second lens barrel is fixedly provided with a focusing lens group with negative optical power, wherein the second lens barrel is movably arranged along the optical axis relative to the first lens barrel, and the focusing lens group includes a fifth lens with negative optical power, a sixth lens with positive optical power, a seventh lens with positive optical power, and an eighth lens with negative optical power in order from the object side to the image side along the optical axis; the object side surface and the image side surface of the fifth lens are respectively a concave surface and a convex surface, the object side surface and the image side surface of the sixth lens are respectively a convex surface and a concave surface, the image side surface of the seventh lens is a convex surface, and the object side surface and the image side surface of the eighth lens are both concave surfaces;

[0007] The optical focusing lens satisfies the following relationship: 1.50<|△f| / Tw<1.90; -1.95<fi / F2≤-1.40;

[0008] Wherein, △f is the effective focal length difference of the optical focusing lens when the object distance is infinity and infinity respectively; Tw is the on-axis air distance between the fixed lens group and the focusing lens group when the object distance is infinity; fi is the effective focal length of the optical focusing lens when the object distance is infinity; F2 is the effective focal length of the focusing lens group.

[0009] With such an arrangement, on the one hand, the optical focusing lens of the present application divides the lens group into two groups, namely a fixed lens group and a focusing lens group, and focuses by moving the focusing lens group. As a result, during the zooming process, the lenses in a single lens group may not move relative to each other, which can simplify the complexity of the mechanism and ensure the feasibility of moving the focusing lens group for focusing.

[0010] On the other hand, the optical focusing lens of the present application controls the relationship between the difference Δf between the effective focal lengths of the system at two object distances and the on-axis air interval Tw (i.e., the maximum air interval between the groups) between the fixed lens group and the focusing lens group when the object distance is infinitely close within a reasonable range. At the same time, the ratio between the effective focal length fi of the system when the object distance is infinitely far and the effective focal length F2 of the focusing lens group is also controlled within a reasonable range. Through the different combinations of the two lens groups and optical focal lengths, not only can clear imaging be achieved at object distances from very close to infinite, but also the on-axis distance between the fixed lens group and the focusing lens group can be effectively regulated to ensure that the moving range of the focusing lens group is minimized to the greatest extent, thereby greatly reducing the size of the lens and achieving miniaturization and lightness of the lens.

[0011] According to one embodiment of the present application, the fixed lens group and the focusing lens group satisfy the relationship: -1.25<F1 / F2<-0.95;

[0012] Wherein, F1 is the effective focal length of the fixed lens group; F2 is the effective focal length of the focusing lens group.

[0013] With such a configuration, the optical focusing lens of the present application controls the ratio between the effective focal length of the fixed lens group and the effective focal length of the focusing lens group within a reasonable range, and ensures the feasibility of the focusing lens group moving and focusing through the reasonable distribution of the optical power between the two groups, while being beneficial to the aberration correction of the optical system and improving the imaging quality of the optical system. If it is lower than the lower limit, the optical power of the fixed lens group becomes weaker, and its small-diameter becomes insufficient, which hinders the miniaturization of the lens barrel; if it is higher than the upper limit, the optical power of the fixed lens group becomes stronger, and the correction of various aberrations such as spherical aberration and coma aberration becomes difficult, which is not conducive to achieving higher optical performance.

[0014] According to one embodiment of the present application, the focusing lens group satisfies the relationship: -1.30<F2 / TD2<-0.90;

[0015] Wherein, F2 is the effective focal length of the focusing lens group; TD2 is the axial distance between the object side surface of the fifth lens and the image side surface of the eighth lens.

[0016] With such an arrangement, the optical focusing lens of the present application helps to reduce the chromatic aberration and image aberration of the optical system by controlling the ratio between the effective focal length F2 of the focusing lens group and the on-axis optical length TD2 of the focusing lens group within a reasonable range, and also helps to reduce the temperature drift sensitivity of the system and increase the focusing stability of the system.

[0017] According to one embodiment of the present application, the focusing lens group satisfies the relationship: 0.90<f8 / F2≤1.45;

[0018] Among them, f8 is the effective focal length of the eighth lens; F2 is the effective focal length of the focusing lens group.

[0019] With such an arrangement, the optical focusing lens of the present application controls the ratio between the effective focal length of the eighth lens and the effective focal length of the focusing lens group within a reasonable range, which is beneficial to reducing the aberration and coma of the optical system, balancing the optical distortion, increasing the resolution of the optical focusing lens, and thus improving the imaging quality of the optical system.

[0020] According to one embodiment of the present application, the focusing lens group satisfies the relationship: 1.60<f5 / f8<2.35;

[0021] Wherein, f5 is the effective focal length of the fifth lens; f8 is the effective focal length of the eighth lens.

[0022] With such an arrangement, the optical focusing lens of the present application controls the ratio between the effective focal length of the fifth lens and the effective focal length of the eighth lens within a reasonable range, which is beneficial to the smooth transition of light, so as to correct various aberrations of the optical system and thus improve the imaging quality.

[0023] According to one embodiment of the present application, the focusing lens group satisfies the relationship: -6.20<f7 / F2<-1.95;

[0024] Wherein, f7 is the effective focal length of the seventh lens; F2 is the effective focal length of the focusing lens group.

[0025] With such an arrangement, the optical focusing lens of the present application controls the ratio between the effective focal length of the seventh lens and the effective focal length of the focusing lens group within a reasonable range, which is beneficial to correcting the aberration of the optical system, improving the imaging quality of the optical system, and effectively balancing the optical distortion.

[0026] According to one embodiment of the present application, the fixed mirror assembly satisfies the relationship: 2.0≤F1 / CT4<2.75;

[0027] Wherein, F1 is the effective focal length of the fixed lens group; CT4 is the center thickness of the fourth lens.

[0028] With such a configuration, the optical focusing lens of the present application can not only avoid the problem that the center thickness of the fourth lens is too thick and the lens cannot be formed, but also solve the problem that the optical system is easy to interfere with the focusing lens group during the focusing process by limiting the ratio between the effective focal length of the fixed lens group and the center thickness of the fourth lens, and can also solve the problem that the optical system is easy to interfere with the focusing lens group during the focusing process; at the same time, it can also better transition the light of the fixed lens group, so that the light emitted through the fixed lens group can better cooperate with the focusing lens group to achieve focusing at different object distances. If it is lower than the lower limit, it may cause the thickness of the fourth lens to be too thick, which is not conducive to the molding of the lens, and also affect the degree of light deflection of the lens, which may cause scattering and refraction of light, resulting in chromatic aberration, distortion and other problems in imaging. If it is higher than the upper limit, the focal length of the fixed lens group becomes stronger, and the correction of various aberrations such as spherical aberration and coma aberration becomes difficult, which is not conducive to achieving higher optical performance.

[0029] According to one embodiment of the present application, the fixed mirror assembly satisfies the relationship: 2.10<f1 / F1<4.20;

[0030] Among them, f1 is the effective focal length of the first lens; F1 is the effective focal length of the fixed lens group.

[0031] With such a configuration, the optical focusing lens of the present application controls the ratio between the effective focal length of the first lens and the effective focal length of the fixed lens group within a reasonable range. By reasonably allocating the optical focal length, it can not only improve the correction effect of spherical aberration and coma, but also enhance the light convergence ability, which is beneficial to improve relative illumination, enhance recognition effect, and further improve optical imaging quality to meet the shooting needs of various complex environments.

[0032] According to one embodiment of the present application, the fixed mirror assembly satisfies the relationship: -3.85<f3 / F1<-2.25;

[0033] Among them, f3 is the effective focal length of the third lens; F1 is the effective focal length of the fixed lens group.

[0034] With such an arrangement, the optical focusing lens of the present application can achieve a reasonable combination of optical focal lengths by constraining the ratio between the effective focal length of the third lens and the effective focal length of the fixed lens group, which plays an important role in correcting the aberrations of the entire optical focusing lens and is beneficial to improving the imaging quality of the optical system.

[0035] According to one embodiment of the present application, the fixed mirror assembly satisfies the relationship: 2.30<f1 / f4≤4.75;

[0036] Wherein, f1 is the effective focal length of the first lens; f4 is the effective focal length of the fourth lens.

[0037] With such a configuration, the optical focusing lens of the present application is beneficial for adjusting the refractive power distribution of the lens by limiting the ratio between the effective focal length of the first lens and the effective focal length of the fourth lens, which helps to ensure smooth transition of light, compress the lens volume and correct aberrations, so as to improve imaging quality.

[0038] According to one embodiment of the present application, the fixed mirror assembly satisfies the relationship: 2.85<TD1 / (T23+T34)<4.45;

[0039] Wherein, TD1 is the on-axis distance between the object side surface of the first lens and the image side surface of the fourth lens; T23 is the on-axis air space between the second lens and the third lens; and T34 is the on-axis air space between the third lens and the fourth lens.

[0040] With such arrangement, the optical focusing lens of the present application can effectively control the distance between lenses by constraining the ratio of the on-axis optical length TD1 of the fixed lens group to the sum of the on-axis air spacings between the second lens, the third lens and the fourth lens (T23+T34), thereby making the optical focusing lens more compact while ensuring the processability of the lens, avoiding the bearing and assembly problems caused by the close spacing between the lenses, and ensuring the miniaturization and lightweight of the lens.

[0041] According to one embodiment of the present application, the optical focusing lens satisfies the relationship: 1.80<|△f| / |△T|≤2.55;

[0042] Wherein, Δf is the effective focal length difference of the optical focusing lens when the object distance is infinite and infinitely close respectively; ΔT is the on-axis air spacing difference between the fixed lens group and the focusing lens group when the object distance is infinitely close and infinitely close.

[0043] With such a configuration, the optical focusing lens of the present application can effectively limit the movement amount of the focusing lens group during the focusing process when the object distance changes from infinity to infinity by limiting the relationship between the effective focal length difference △f of the optical focusing lens and the movement amount △T of the focusing lens group when the object distance is infinity and infinity, thereby achieving miniaturization of the lens.

[0044] According to one embodiment of the present application, the optical focusing lens satisfies the relationship: -3.40<F2 / |△f|≤-3.25;

[0045] Wherein, F2 is the effective focal length of the focusing lens group; Δf is the effective focal length difference of the optical focusing lens when the object distance is infinite and infinitely close respectively.

[0046] With such arrangement, the optical focusing lens of the present application realizes a reasonable matching of optical focal lengths by constraining the relationship between the effective focal length of the focusing lens group and the effective focal length difference Δf of the optical focusing lens when the object distance is infinite and infinitely close, so that the focusing lens group can effectively realize the function of focusing at different object distances; at the same time, it can also largely correct the influence of the lens's higher-order aberrations on the imaging quality.

[0047] According to one embodiment of the present application, the focusing lens group satisfies the relationship: -14.65≤f6 / F2<-13.25;

[0048] Wherein, f6 is the effective focal length of the sixth lens; F2 is the effective focal length of the focusing lens group.

[0049] With such an arrangement, the optical focusing lens of the present application controls the ratio between the effective focal length of the sixth lens and the effective focal length of the focusing lens group within a reasonable range, which is beneficial for correcting distortion and reducing the degree of deformation of the imaging, so as to effectively restore the true appearance of the object.

[0050] According to one embodiment of the present application, the focusing lens group satisfies the relationship: 0.80<T56 / (CT5+CT6)<0.95;

[0051] Wherein, T56 is the on-axis air space between the fifth lens and the sixth lens; CT5 is the center thickness of the fifth lens; and CT6 is the center thickness of the sixth lens.

[0052] With such arrangement, the optical focusing lens of the present application can effectively control the gap and center thickness of the fifth lens and the sixth lens by controlling the ratio of the on-axis air gap between the fifth lens and the sixth lens to the sum of the center thicknesses of the fifth lens and the sixth lens within a reasonable range, which is beneficial to ensuring the processability and assemblability of the fifth lens and the sixth lens, preventing the problem of being unable to be processed and formed due to the fifth lens and the sixth lens being too thin, and also avoiding the problem of being unable to be assembled due to the fifth lens and the sixth lens being too close to each other.

[0053] According to one embodiment of the present application, the optical focusing lens satisfies the relationship: 6.90<TD1 / |△f|<8.90;

[0054] Wherein, TD1 is the on-axis distance between the object side surface of the first lens and the image side surface of the fourth lens; Δf is the effective focal length difference of the optical focusing lens when the object distance is infinite and infinitely close respectively.

[0055] With such arrangement, the optical focusing lens of the present application can ensure the focusing ability of the optical focusing lens at different object distances by constraining the relationship between the on-axis optical length TD1 of the fixed lens group and the effective focal length difference △f when the object distance is infinitely far and infinitely close, so that the deflection angle of the light is controlled within a certain range, which is beneficial to reducing the spherical aberration and coma of the system; at the same time, it can also make the lens of the imaging part of the lens more compact, thereby reducing the influence of stray light on the imaging quality.

[0056] According to one embodiment of the present application, the fourth lens and the fifth lens satisfy the relationship: 19.15<(R8+R9) / (R8-R9)<28.85;

[0057] Wherein, R8 is the curvature radius of the image side surface of the fourth lens; R9 is the curvature radius of the object side surface of the fifth lens.

[0058] With such an arrangement, the optical focusing lens of the present application constrains the curvature radius of the image side surface of the fourth lens and the object side surface of the fifth lens within a certain range, which is beneficial for converging light, better correcting the astigmatism and various aberrations such as coma and spherical aberration of the optical system, and can effectively reduce the optical distortion of the system, so that the system maintains good imaging quality.

[0059] According to another aspect of the present application, the present application further provides a camera module, including:

[0060] Photosensitive components; and

[0061] Any of the above-mentioned optical focusing lenses is arranged on the photosensitive side of the photosensitive component. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1A is a schematic structural diagram of an optical focusing lens in a camera module according to an embodiment of the present application;

[0063] Figure 1B Example 1 of the optical focusing lens in the camera module according to the above embodiment of the present application is shown;

[0064] Figure 2A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens according to the above Example 1 of the present application is in a first state;

[0065] Figure 2B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the above Example 1 of the present application is in a first state;

[0066] Figure 2C is a schematic diagram of a distortion curve when the optical focusing lens according to the above example 1 of the present application is in a first state;

[0067] Figure 3A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens according to the above Example 1 of the present application is in a second state;

[0068] Figure 3B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the above example 1 of the present application is in a second state;

[0069] Figure 3C is a schematic diagram of a distortion curve when the optical focusing lens according to the above example 1 of the present application is in a second state;

[0070] Figure 4A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens according to the above Example 1 of the present application is in a third state;

[0071] Figure 4B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the above example 1 of the present application is in a third state;

[0072] Figure 4C is a schematic diagram of a distortion curve when the optical focusing lens according to the above example 1 of the present application is in a third state;

[0073] Figure 5 This is Example 2 of the optical focusing lens in the camera module according to the above embodiment of the present application;

[0074] Fig. 6A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of the second example of the present application is in a first state;

[0075] Figure 6B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the second example of the present application is in a first state;

[0076] Figure 6C is a schematic diagram of a distortion curve when the optical focusing lens according to the second example of the present application is in a first state;

[0077] Fig. 7A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of the above-mentioned Example 2 of the present application is in a second state;

[0078] Figure 7B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the second example of the present application is in a second state;

[0079] Figure 7C is a schematic diagram of a distortion curve when the optical focusing lens according to the second example of the present application is in a second state;

[0080] Fig. 8Ais a schematic diagram of an axial chromatic aberration curve when the optical focusing lens of the above-mentioned Example 2 of the present application is in a third state;

[0081] Figure 8B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the second example of the present application is in a third state;

[0082] Figure 8C is a schematic diagram of a distortion curve when the optical focusing lens according to the second example of the present application is in a third state;

[0083] Fig. 9 This is Example 3 of the optical focusing lens in the camera module according to the above embodiment of the present application;

[0084] Fig. 10A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 3 of the present application is in a first state;

[0085] Fig. 10B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the third example of the present application is in a first state;

[0086] Fig. 10C is a schematic diagram of a distortion curve when the optical focusing lens according to the third example of the present application is in a first state;

[0087] Fig.11A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 3 of the present application is in a second state;

[0088] Fig. 11B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the third example of the present application is in a second state;

[0089] Fig. 11C is a schematic diagram of a distortion curve when the optical focusing lens according to the third example of the present application is in a second state;

[0090] Fig. 12A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 3 of the present application is in a third state;

[0091] Fig. 12B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the third example of the present application is in a third state;

[0092] Fig. 12C is a schematic diagram of a distortion curve when the optical focusing lens according to the third example of the present application is in a third state;

[0093] Fig.13 This is Example 4 of the optical focusing lens in the camera module according to the above embodiment of the present application;

[0094] Fig.14A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 4 of the present application is in a first state;

[0095] Fig. 14B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the fourth example of the present application is in a first state;

[0096] Fig. 14C is a schematic diagram of a distortion curve when the optical focusing lens according to the fourth example of the present application is in a first state;

[0097] Fig.15A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 4 of the present application is in a second state;

[0098] Fig. 15B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the fourth example of the present application is in a second state;

[0099] Fig. 15C is a schematic diagram of a distortion curve when the optical focusing lens according to the fourth example of the present application is in a second state;

[0100] Fig.16A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 4 of the present application is in a third state;

[0101] Fig. 16B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the fourth example of the present application is in a third state;

[0102] Fig. 16C is a schematic diagram of a distortion curve when the optical focusing lens according to the fourth example of the present application is in a third state;

[0103] Fig.17 This is Example 5 of the optical focusing lens in the camera module according to the above embodiment of the present application;

[0104] Fig.18A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 5 of the present application is in a first state;

[0105] Fig.18B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the fifth example of the present application is in a first state;

[0106] Fig. 18C is a schematic diagram of a distortion curve when the optical focusing lens according to the fifth example of the present application is in a first state;

[0107] Fig.19Ais a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 5 of the present application is in a second state;

[0108] Fig.19B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the fifth example of the present application is in a second state;

[0109] Fig.19C is a schematic diagram of a distortion curve when the optical focusing lens according to the fifth example of the present application is in a second state;

[0110] Fig. 20A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 5 of the present application is in a third state;

[0111] Fig. 20B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the fifth example of the present application is in a third state;

[0112] Fig. 20C is a schematic diagram of a distortion curve when the optical focusing lens according to the fifth example of the present application is in a third state;

[0113] Fig.21 This is Example 6 of the optical focusing lens in the camera module according to the above embodiment of the present application;

[0114] Fig.22A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 6 of the present application is in a first state;

[0115] Fig. 22B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the sixth example of the present application is in a first state;

[0116] Fig. 22C is a schematic diagram of a distortion curve when the optical focusing lens according to the sixth example of the present application is in a first state;

[0117] Fig.23A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 6 of the present application is in a second state;

[0118] Fig. 23B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the sixth example of the present application is in a second state;

[0119] Fig.23C is a schematic diagram of a distortion curve when the optical focusing lens according to the sixth example of the present application is in a second state;

[0120] Fig.24A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 6 of the present application is in a third state;

[0121] Fig. 24B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the sixth example of the present application is in a third state;

[0122] Fig.24C is a schematic diagram of a distortion curve when the optical focusing lens according to the sixth example of the present application is in a third state;

[0123] Fig.25 This is Example 7 of the optical focusing lens in the camera module according to the above embodiment of the present application;

[0124] Fig.26A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 7 of the present application is in a first state;

[0125] Fig.26B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the seventh example of the present application is in a first state;

[0126] Fig.26C is a schematic diagram of a distortion curve when the optical focusing lens according to the seventh example of the present application is in a first state;

[0127] Fig.27A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 7 of the present application is in a second state;

[0128] Fig.27B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the seventh example of the present application is in a second state;

[0129] Fig.27C is a schematic diagram of a distortion curve when the optical focusing lens according to the seventh example of the present application is in a second state;

[0130] Fig.28A is a schematic diagram of an on-axis chromatic aberration curve when the optical focusing lens of Example 7 of the present application is in a third state;

[0131] Fig.28B is a schematic diagram of an astigmatism curve when the optical focusing lens according to the seventh example of the present application is in a third state;

[0132] Fig.28C is a schematic diagram of a distortion curve when the optical focusing lens according to the above-mentioned Example 7 of the present application is in the third state.

[0133] Explanation of the main component symbols: 11, first lens barrel; G1, fixed lens group; E1, first lens; E2, second lens; E3, third lens; E4, fourth lens; 12, second lens barrel; G2, focusing lens group; E5, fifth lens; E6, sixth lens; E7, seventh lens; E8, eighth lens; E9, light-transmitting sheet.

[0134] The above description of the main component symbols is combined with the accompanying drawings and specific implementation methods to further illustrate the present application in detail. DETAILED DESCRIPTION

[0135] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0136] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0137] In the present invention, the term "one" in the claims and the specification should be understood as "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. Unless it is clearly indicated in the disclosure of the present invention that the number of the element is only one, the term "one" cannot be understood as unique or single, and the term "one" cannot be understood as a limitation on the quantity.

[0138] In the description of the present invention, it should be understood that "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through a medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0139] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0140] Considering that in some cases of shooting dynamic objects, the focus function of existing focus cameras is not powerful enough and often cannot be used handy. This is because the fixed-point hovering time of dynamic objects is too short, and the focus time of existing cameras is long, and objects may still not be captured well when focusing on a single point. Therefore, this application creatively proposes an optical focus lens and camera module, which can achieve accurate and fast autofocus effects in different shooting environments, which is conducive to improving the shooting experience.

[0141] Specifically, refer to the accompanying drawings of the specification of this application. Figures 1A to 28C According to one embodiment of the present application, a camera module is provided, which may include an optical focusing lens and a photosensitive component (not shown in the figure), and the optical focusing lens is arranged on the photosensitive side of the photosensitive component so that external light is first modulated through the optical focusing lens to form an image, and then received by the photosensitive component to obtain image data. It can be understood that the photosensitive component mentioned in the present application may include but is not limited to image sensors such as CCD (charge coupled device), CMOS (complementary metal-oxide semiconductor) or digital signal processing chip (DSP), and the present application will not elaborate on this.

[0142] More specifically, if Figure 1A and Figure 1BAs shown, the optical focusing lens may include a first lens barrel 11 and a second lens barrel 12 arranged in sequence from the object side to the image side along the optical axis. The first lens barrel 11 is provided with a fixed lens group G1 with positive optical power; the second lens barrel 12 is provided with a focusing lens group G2 with negative optical power, and the second lens barrel 12 is movably arranged along the optical axis relative to the first lens barrel 11. The fixed lens group G1 includes a first lens E1 with positive optical power, a second lens E2 with optical power, a third lens E3 with negative optical power, and a fourth lens E4 with positive optical power in sequence from the object side to the image side along the optical axis. The focusing lens group G2 includes a fifth lens E5 with negative optical power, a sixth lens E6 with positive optical power, a seventh lens E7 with positive optical power, and an eighth lens E8 with negative optical power in sequence from the object side to the image side along the optical axis.

[0143] In particular, the optical focusing lens satisfies the following relationship: 1.50<|△f| / Tw<1.90; -1.95<fi / F2≤-1.40;

[0144] Wherein, △f is the effective focal length difference of the optical focusing lens when the object distance is infinity (extremely far) and infinity (extremely close) respectively; Tw is the on-axis air distance between the fixed lens group G1 and the focusing lens group G2 when the object distance is infinitely close; fi is the effective focal length of the optical focusing lens when the object distance is infinite; F2 is the effective focal length of the focusing lens group G2.

[0145] It is worth noting that, on the one hand, the optical focusing lens of the present application divides the lens group into two groups, namely a fixed lens group G1 and a focusing lens group G2, and focuses by moving the focusing lens group G2. Therefore, during the zooming process, the lenses in a single lens group can have no relative movement with respect to each other, which can simplify the complexity of the mechanism and ensure the feasibility of moving and focusing the focusing lens group G2.

[0146] On the other hand, the optical focusing lens of the present application controls the relationship between the difference △f between the effective focal lengths of the system at two object distances and the on-axis air interval Tw (i.e., the maximum air interval between the groups) between the fixed lens group G1 and the focusing lens group G2 when the object distance is infinitely close to be between 1.50 and 1.90. At the same time, the ratio between the effective focal length fi of the system when the object distance is infinitely far and the effective focal length F2 of the focusing lens group is controlled to be between -1.95 and -1.40. Through the different combinations of the two lens groups and optical focal lengths, not only can clear imaging be achieved at object distances from very close to infinite, but also the on-axis distance between the fixed lens group G1 and the focusing lens group G2 can be effectively regulated to ensure that the moving range of the focusing lens group G2 is minimized to the greatest extent, thereby greatly reducing the size of the lens and achieving miniaturization and lightness of the lens.

[0147] In addition, the object side surface and the image side surface of the second lens E2 are convex and concave respectively; the image side surface of the third lens is concave; the object side surface and the image side surface of the fourth lens E4 are both convex; the object side surface and the image side surface of the fifth lens E5 are concave and convex respectively; the object side surface and the image side surface of the sixth lens E6 are convex and concave respectively; the image side surface of the seventh lens E7 is convex; the object side surface and the image side surface of the eighth lens E8 are both concave. It can be understood that the object side surface and the image side surface of the first lens E1 can be convex or concave, as long as the first lens E1 has positive focal power; the object side surface of the third lens E3 can be convex or concave, as long as the third lens E3 has negative focal power; the object side surface of the seventh lens E7 can be convex or concave, as long as the seventh lens E7 has positive focal power.

[0148] Preferably, the optical focusing lens satisfies the following relationship: 1.51≤|Δf| / Tw≤1.88; -1.93≤fi / F2≤-1.40.

[0149] It is worth noting that, since the fixed lens group G1 is assembled in the first lens barrel 11, and the focusing lens group G2 is assembled in the second lens barrel 12, when the object distance is from far to near, the focusing lens group G2 can be moved as a whole by moving the second lens barrel 12 along the optical axis relative to the first lens barrel 11 to achieve focus adjustment. In addition, the optical focusing lens of the present application may also include, but is not limited to, other components such as filters, spacers, or pressure rings, which will not be described in detail in the present application.

[0150] For example, Figures 1B to 25 As shown, the optical focusing lens may further include a light-transmitting sheet E9, which is located between the focusing lens group G2 and the imaging surface of the optical focusing lens so as to filter the light emitted through the focusing lens and protect the photosensitive surface of the photosensitive component.

[0151] Optionally, the fixed lens group G1 and the focusing lens group G2 satisfy the relationship: -1.25<F1 / F2<-0.95;

[0152] Wherein, F1 is the effective focal length of the fixed lens group G1; F2 is the effective focal length of the focusing lens group G2.

[0153] In other words, the optical focusing lens of the present application controls the ratio between the effective focal length of the fixed lens group G1 and the effective focal length of the focusing lens group G2 to be between -1.25 and -0.95, and ensures the feasibility of the mobile focusing of the focusing lens group G2 through the reasonable distribution of the optical power between the two groups, and is also beneficial to the aberration correction of the optical system and the improvement of the imaging quality of the optical system. If it is lower than the lower limit, the optical power of the fixed lens group G1 becomes weak, and its small diameter becomes insufficient, which hinders the miniaturization of the lens barrel; if it is higher than the upper limit, the optical power of the fixed lens group G1 becomes strong, and the correction of various aberrations such as spherical aberration and coma aberration becomes difficult, which is not conducive to achieving higher optical performance.

[0154] Preferably, the fixed lens group G1 and the focusing lens group G2 satisfy the relationship: -1.23≤F1 / F2≤-0.99.

[0155] According to one embodiment of the present application, the focusing lens group G2 satisfies the relationship: -1.30<F2 / TD2<-0.90;

[0156] Wherein, F2 is the effective focal length of the focusing lens group G2; TD2 is the axial distance between the object-side surface of the fifth lens E5 and the image-side surface of the eighth lens E8.

[0157] In other words, the optical focusing lens of the present application controls the ratio between the effective focal length F2 of the focusing lens group G2 and the on-axis optical length TD2 of the focusing lens group G2 between -1.30 and -0.90, which is beneficial to reducing the chromatic aberration and image aberration of the optical system, and is also beneficial to reducing the temperature drift sensitivity of the system and increasing the focusing stability of the system.

[0158] Preferably, the focusing lens group G2 satisfies the relationship: -1.29≤F2 / TD2≤-0.92.

[0159] According to one embodiment of the present application, the focusing lens group G2 satisfies the relationship: 0.90<f8 / F2≤1.45;

[0160] Wherein, f8 is the effective focal length of the eighth lens E8; F2 is the effective focal length of the focusing lens group G2.

[0161] In other words, the optical focusing lens of the present application controls the ratio between the effective focal length of the eighth lens E8 and the effective focal length of the focusing lens group G2 within a range of 0.90 to 1.45, which is beneficial to reducing the aberrations and coma of the optical system, balancing the optical distortion, and increasing the resolution of the optical focusing lens, thereby improving the imaging quality of the optical system.

[0162] Preferably, the focusing lens group G2 satisfies the relationship: 0.94≤f8 / F2≤1.45.

[0163] According to one embodiment of the present application, the focusing lens group G2 satisfies the relationship: 1.60<f5 / f8<2.35;

[0164] Wherein, f5 is the effective focal length of the fifth lens E5; f8 is the effective focal length of the eighth lens E8.

[0165] In other words, the optical focusing lens of the present application controls the ratio between the effective focal length of the fifth lens E5 and the effective focal length of the eighth lens E8 within a range of 1.60 to 2.35, which is beneficial to the smooth transition of light, so as to correct various aberrations of the optical system and thus improve the imaging quality.

[0166] Preferably, the focusing lens group G2 satisfies the relationship: 1.61≤f5 / f8≤2.31.

[0167] According to one embodiment of the present application, the focusing lens group G2 satisfies the relationship: -6.20<f7 / F2<-1.95;

[0168] Wherein, f7 is the effective focal length of the seventh lens E7; F2 is the effective focal length of the focusing lens group G2.

[0169] In other words, the optical focusing lens of the present application controls the ratio between the effective focal length of the seventh lens E7 and the effective focal length of the focusing lens group G2 within a range of -6.20 to -1.95, which is beneficial to correcting the aberration of the optical system, improving the imaging quality of the optical system, and effectively balancing the optical distortion.

[0170] Preferably, the focusing lens group G2 satisfies the relationship: -6.16≤f7 / F2≤-1.97.

[0171] According to an embodiment of the present application, the fixed mirror group G1 satisfies the relationship: 2.0≤F1 / CT4<2.75;

[0172] Wherein, F1 is the effective focal length of the fixed lens group G1; CT4 is the central thickness of the fourth lens E4.

[0173] In other words, the optical focusing lens of the present application can not only avoid the problem that the center thickness of the fourth lens E4 is too thick and the lens cannot be formed, but also solve the problem that the optical system is easy to interfere with the focusing lens group G2 during the focusing process by limiting the ratio between the effective focal length of the fixed lens group G1 and the center thickness of the fourth lens E4 to between 2.0 and 2.75; at the same time, it can also better transition the light of the fixed lens group G1, so that the light emitted through the fixed lens group G1 can better cooperate with the focusing lens group G2 to achieve focusing at different object distances. If it is lower than the lower limit, the thickness of the fourth lens E4 may be too thick, which is not conducive to the molding of the lens, and it also affects the degree of light deflection of the lens, which may cause scattering and refraction of light, resulting in chromatic aberration, distortion and other problems in imaging. If it is higher than the upper limit, the focal length of the fixed lens group G1 becomes stronger, and the correction of various aberrations such as spherical aberration and coma aberration becomes difficult, which is not conducive to achieving higher optical performance.

[0174] Preferably, the fixed mirror group G1 satisfies the relationship: 2.00≤F1 / CT4≤2.74.

[0175] According to one embodiment of the present application, the fixed mirror group G1 satisfies the relationship: 2.10<f1 / F1<4.20;

[0176] Wherein, f1 is the effective focal length of the first lens E1; F1 is the effective focal length of the fixed lens group G1.

[0177] In other words, the optical focusing lens of the present application controls the ratio between the effective focal length of the first lens E1 and the effective focal length of the fixed lens group G1 between 2.10 and 4.20. By reasonably allocating the optical power, it can not only improve the correction effect of spherical aberration and coma, but also enhance the light convergence ability, which is beneficial to improve the relative illumination, enhance the recognition effect, and further improve the optical imaging quality to meet the shooting needs of various complex environments.

[0178] Preferably, the fixed mirror group G1 satisfies the relationship: 2.14≤f1 / F1≤4.16.

[0179] According to one embodiment of the present application, the fixed mirror group G1 satisfies the relationship: -3.85<f3 / F1<-2.25;

[0180] Wherein, f3 is the effective focal length of the third lens E3; F1 is the effective focal length of the fixed lens group G1.

[0181] In other words, the optical focusing lens of the present application can achieve a reasonable combination of optical focal lengths by constraining the ratio between the effective focal length of the third lens E3 and the effective focal length of the fixed lens group G1 to between -3.85 and -2.25, which plays an important role in correcting the aberrations of the entire optical focusing lens and is beneficial to improving the imaging quality of the optical system.

[0182] Preferably, the fixed mirror group G1 satisfies the relationship: -3.76≤f3 / F1≤-2.28.

[0183] According to one embodiment of the present application, the fixed mirror group G1 satisfies the relationship: 2.30<f1 / f4≤4.75;

[0184] Wherein, f1 is the effective focal length of the first lens E1; f4 is the effective focal length of the fourth lens E4.

[0185] In other words, the optical focusing lens of the present application, by limiting the ratio between the effective focal length of the first lens E1 and the effective focal length of the fourth lens E4 to between 2.30 and 4.75, is conducive to adjusting the refractive power distribution of the lens, facilitating the smooth transition of light, compressing the lens volume and correcting aberrations, so as to improve the imaging quality.

[0186] Preferably, the fixed mirror group G1 satisfies the relationship: 2.34≤f1 / f4≤4.75.

[0187] According to one embodiment of the present application, the fixed mirror group G1 satisfies the relationship: 2.85<TD1 / (T23+T34)<4.45;

[0188] Wherein, TD1 is the axial distance between the object side surface of the first lens E1 and the image side surface of the fourth lens E4; T23 is the axial air space between the second lens E2 and the third lens E3; T34 is the axial air space between the third lens E3 and the fourth lens E4.

[0189] In other words, the optical focusing lens of the present application can effectively control the distance between lenses by constraining the ratio of the on-axis optical length TD1 of the fixed lens group G1 to the sum of the on-axis air spacings (T23+T34) between the second lens E2, the third lens E3 and the fourth lens E4 to be between 2.85 and 4.45, thereby ensuring the processability of the lens and making the optical focusing lens more compact, avoiding the bearing and assembly problems caused by the close spacing between the lenses and ensuring the miniaturization and lightness of the lens.

[0190] Preferably, the fixed mirror group G1 satisfies the relationship: 2.88≤TD1 / (T23+T34)≤4.44.

[0191] According to an embodiment of the present application, the optical focusing lens satisfies the relationship: 1.80<|△f| / |△T|≤2.55;

[0192] Wherein, △f is the effective focal length difference of the optical focusing lens when the object distance is infinite and infinitely close respectively; △T is the on-axis air spacing difference between the fixed lens group G1 and the focusing lens group G2 when the object distance is infinitely close and infinitely close.

[0193] In other words, the optical focusing lens of the present application can effectively limit the movement amount of the focusing lens group G2 in the focusing process when the object distance changes from infinity to infinity by limiting the relationship between the effective focal length difference △f of the optical focusing lens and the movement amount △T of the focusing lens group G2 to between 1.80 and 2.55 when the object distance is infinity and infinity, thereby realizing the miniaturization of the lens.

[0194] Preferably, the optical focusing lens satisfies the relationship: 1.82≤|Δf| / |ΔT|≤2.55.

[0195] According to one embodiment of the present application, the optical focusing lens satisfies the relationship: -3.40<F2 / |△f|≤-3.25;

[0196] Wherein, F2 is the effective focal length of the focusing lens group G2; Δf is the effective focal length difference of the optical focusing lens when the object distance is infinite and infinitely close respectively.

[0197] In other words, the optical focusing lens of the present application achieves a reasonable combination of optical focal lengths by constraining the relationship between the effective focal length of the focusing lens group G2 and the effective focal length difference △f of the optical focusing lens when the object distance is infinite and infinitely close to be between -3.40 and -3.25, so that the focusing lens group G2 can effectively realize the function of focusing at different object distances; at the same time, it can also correct the influence of the lens's higher-order aberrations on the imaging quality to a great extent.

[0198] Preferably, the optical focusing lens satisfies the relationship: -3.39≤F2 / |Δf|≤-3.25.

[0199] According to one embodiment of the present application, the focusing lens group G2 satisfies the relationship: -14.65≤f6 / F2<-13.25;

[0200] Wherein, f6 is the effective focal length of the sixth lens E6; F2 is the effective focal length of the focusing lens group G2.

[0201] In other words, the optical focusing lens of the present application controls the ratio between the effective focal length of the sixth lens E6 and the effective focal length of the focusing lens group G2 within a range of -14.65 to -13.25, which is beneficial for correcting distortion and reducing the degree of deformation of the imaging, so as to effectively restore the true appearance of the object.

[0202] Preferably, the focusing lens group G2 satisfies the relationship: -14.65≤f6 / F2≤-13.29.

[0203] According to one embodiment of the present application, the focusing lens group G2 satisfies the relationship: 0.80<T56 / (CT5+CT6)<0.95;

[0204] Wherein, T56 is the axial air space between the fifth lens E5 and the sixth lens E6; CT5 is the center thickness of the fifth lens E5; and CT6 is the center thickness of the sixth lens E6.

[0205] In other words, the optical focusing lens of the present application can effectively control the gap and center thickness of the fifth lens E5 and the sixth lens E6 by controlling the ratio of the on-axis air gap between the fifth lens E5 and the sixth lens E6 to the sum of the center thicknesses of the fifth lens E5 and the sixth lens E6 within a range of 0.80 to 0.95, which is beneficial to ensuring the processability and assemblability of the fifth lens E5 and the sixth lens E6, preventing the problem of being unable to be processed and formed due to the fifth lens E5 and the sixth lens E6 being too thin, and also avoiding the problem of being unable to be assembled due to the fifth lens E5 and the sixth lens E6 being too close.

[0206] Preferably, the focusing lens group G2 satisfies the relationship: 0.82≤T56 / (CT5+CT6)≤0.93.

[0207] According to one embodiment of the present application, the optical focusing lens satisfies the relationship: 6.90<TD1 / |△f|<8.90;

[0208] Wherein, TD1 is the axial distance between the object side surface of the first lens E1 and the image side surface of the fourth lens E4; Δf is the effective focal length difference of the optical focusing lens when the object distance is infinite and infinitely close respectively.

[0209] In other words, the optical focusing lens of the present application can ensure the focusing ability of the optical focusing lens at different object distances by constraining the relationship between the on-axis optical length TD1 of the fixed lens group G1 and the effective focal length difference △f when the object distance is infinite and infinitely close to be between 6.90 and 8.90, so that the deflection angle of the light is controlled within a certain range, which is beneficial to reducing the spherical aberration and coma of the system; at the same time, it can also make the lens of the imaging part of the lens more compact, thereby reducing the influence of stray light on the imaging quality.

[0210] Preferably, the optical focusing lens satisfies the relationship: 6.94≤TD1 / |Δf|≤8.86.

[0211] According to an embodiment of the present application, the fourth lens E4 and the fifth lens E5 satisfy the relationship: 19.15<(R8+R9) / (R8-R9)<28.85;

[0212] Wherein, R8 is the curvature radius of the image-side surface of the fourth lens E4; and R9 is the curvature radius of the object-side surface of the fifth lens E5.

[0213] In other words, the optical focusing lens of the present application constrains the sum and difference ratio of the curvature radii of the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 to be between 3.8 and 8.9, which is beneficial to converging light, better correcting the astigmatism and various aberrations such as coma and spherical aberration of the optical system, and can effectively reduce the optical distortion of the system, so that the system maintains good imaging quality.

[0214] Preferably, the fourth lens E4 and the fifth lens E5 satisfy the relationship: 19.16≤(R8+R9) / (R8-R9)≤28.84.

[0215] It is worth mentioning that, according to another aspect of the present application, an embodiment of the present application further provides an electronic device, which may include the above-mentioned camera module and a processor (not shown in the figure), and the camera module is communicatively connected to the processor for acquiring image data and inputting the image data into the processor for processing. It is understandable that the electronic device mentioned in the present application may be, but is not limited to, implemented as a device such as a mobile phone equipped with the camera module, and the present application will not repeat it.

[0216] Some specific but non-restrictive examples of the embodiments of the present application are described in more detail below with reference to the accompanying drawings. It should be noted that in the following examples, there are a first state, a second state and a third state, and in the same example, the parameters such as the curvature radius, the center thickness and the high-order coefficients of the lens surface of the first lens E1 to the eighth lens E8 in the first state, the second state and the third state are the same, but the object distance and the position of the focusing lens group G2 relative to the fixed lens group G1 are different; or in other words, the object distance of the optical focusing lens in the first state, the second state and the third state is infinity, 1000mm and 150mm respectively, and accordingly, the focusing lens group G2 moves along the optical axis in the direction away from the fixed lens group G1, so that the axial air space between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 gradually increases. It can be understood that any one of the following examples 1 to 7 is applicable to all embodiments of the present application.

[0217] For ease of description, in the following examples, OBJ represents an object plane of the optical focusing lens, STO represents a surface of a stop, S1 represents an object-side surface of the first lens E1, S2 represents an image-side surface of the first lens E1, S3 represents an object-side surface of the second lens E2, S4 represents an image-side surface of the second lens E2, S5 represents an object-side surface of the third lens E3, S6 represents an image-side surface of the third lens E3, S7 represents an object-side surface of the fourth lens E4, S8 represents an image-side surface of the fourth lens E4, S9 represents an object-side surface of the fifth lens E5, S10 represents an image-side surface of the fifth lens E5, S11 represents an object-side surface of the sixth lens E6, S12 represents an image-side surface of the sixth lens E6, S13 represents an object-side surface of the seventh lens E7, S14 represents an image-side surface of the seventh lens E7, S15 represents an object-side surface of the eighth lens E8, S16 represents an image-side surface of the eighth lens E8, S17 represents an object-side surface of the light-transmitting sheet E9, S18 represents an image-side surface of the light-transmitting sheet E9, and S19 represents an imaging surface of the optical focusing lens. In addition, Aj represents the j-th order aspheric coefficient, j=4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30.

[0218] Example 1

[0219] like Figures 1B to 4C As shown, the optical focusing lens of Example 1 is described. Figure 1B The structure schematic diagram of the optical focusing lens of Example 1 is shown, wherein the first lens E1 has positive focal power, and the object side surface and the image side surface of the first lens E1 are concave and convex respectively; the second lens E2 has negative focal power, and the object side surface and the image side surface of the second lens E2 are convex and concave respectively; the third lens E3 has negative focal power, and the object side surface and the image side surface of the third lens E3 are concave and concave respectively; the fourth lens E4 has positive focal power, and the object side surface and the image side surface of the fourth lens E4 are convex and convex respectively; the fifth lens E5 has negative focal power, and the object side surface and the image side surface of the fifth lens E5 are concave and convex respectively; the sixth lens E6 has positive focal power, and the object side surface and the image side surface of the sixth lens E6 are convex and concave respectively; the seventh lens E7 has positive focal power, and the object side surface and the image side surface of the seventh lens E7 are concave and convex respectively; the eighth lens E8 has negative focal power, and the object side surface and the image side surface of the eighth lens E8 are concave and concave respectively.

[0220] According to the above relationship, Table 1 and Table 2 show the design data of the optical focusing lens of Example 1. Table 1 shows the basic optical parameters of the optical focusing lens of Example 1, where the units of the radius of curvature and thickness are both in millimeters; Table 2 shows the high-order coefficient table of each aspherical surface S1 to S16 of the optical focusing lens of Example 1.

[0221] Table 1: Basic optical parameters of the optical focusing lens of Example 1

[0222]

[0223] It should be noted that the OBJ thicknesses of infinity, 1000 and 150 in Table 1 represent the optical focusing lens in Example 1 in the first state, the second state and the third state, respectively; the S8 thicknesses of 0.5102, 0.6224 and 1.3162 in Table 1 represent the axial air space between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 in the optical focusing lens in the first state, the second state and the third state, respectively; the S16 thicknesses of 1.4799, 1.3677 and 0.6738 in Table 1 represent the axial air space between the image side surface of the eighth lens E8 and the object side surface of the light-transmitting sheet E9 in the optical focusing lens in the first state, the second state and the third state, respectively.

[0224] Table 2: Aspheric coefficients of the optical focusing lens of Example 1

[0225]

[0226]

[0227] After simulation testing, the axial chromatic aberration curves of the optical focusing lens in the first state, the second state and the third state in Example 1 are as follows: Figure 2A , Figure 3A as well as Figure 4A As shown in FIG. 1 , it indicates the degree of deviation of the focal point of light of different wavelengths after passing through the optical focusing lens; the astigmatism curves of the optical focusing lens in the first state, the second state and the third state in Example 1 are shown in FIG. 1 , respectively. Figure 2B , Figure 3B as well as Figure 4B As shown, it represents the degree of meridian image curvature and sagittal image curvature; the distortion curves of the optical focusing lens in the first state, the second state and the third state in Example 1 are respectively as shown Figure 2C , Figure 3C as well as Figure 4C As shown in , it represents the distortion value corresponding to different field of view angles. Figures 2A to 4C It can be seen that the optical focusing lens of Example 1 can achieve good imaging quality at different object distances.

[0228] Example 2

[0229] like Figures 5 to 8C As shown, the optical focusing lens of Example 2 is described. Figure 5The structure schematic diagram of the optical focusing lens of Example 2 is shown, wherein the first lens E1 has positive focal power, and the object side surface and the image side surface of the first lens E1 are convex and convex respectively; the second lens E2 has negative focal power, and the object side surface and the image side surface of the second lens E2 are convex and concave respectively; the third lens E3 has negative focal power, and the object side surface and the image side surface of the third lens E3 are convex and concave respectively; the fourth lens E4 has positive focal power, and the object side surface and the image side surface of the fourth lens E4 are convex and convex respectively; the fifth lens E5 has negative focal power, and the object side surface and the image side surface of the fifth lens E5 are concave and convex respectively; the sixth lens E6 has positive focal power, and the object side surface and the image side surface of the sixth lens E6 are convex and concave respectively; the seventh lens E7 has positive focal power, and the object side surface and the image side surface of the seventh lens E7 are concave and convex respectively; the eighth lens E8 has negative focal power, and the object side surface and the image side surface of the eighth lens E8 are concave and concave respectively.

[0230] According to the above relationship, Tables 3 and 4 show the design data of the optical focusing lens of Example 2. Table 3 shows the basic optical parameters of the optical focusing lens of Example 2, where the units of the radius of curvature and thickness are both millimeters; Table 4 shows the high-order coefficient table of each aspherical surface S1 to S16 of the optical focusing lens of Example 2.

[0231] Table 3: Basic optical parameters of the optical focusing lens of Example 2

[0232]

[0233]

[0234] It should be noted that the OBJ thicknesses of infinity, 1000 and 150 in Table 3 represent the optical focusing lens in Example 2 in the first state, the second state and the third state, respectively; the S8 thicknesses of 0.5133, 0.6257 and 1.3196 in Table 3 represent the axial air space between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 in the optical focusing lens in the first state, the second state and the third state, respectively; the S16 thicknesses of 1.4883, 1.3759 and 0.6820 in Table 3 represent the axial air space between the image side surface of the eighth lens E8 and the object side surface of the light-transmitting sheet E9 in the optical focusing lens in the first state, the second state and the third state, respectively.

[0235] Table 4: Aspheric coefficients of the optical focusing lens of Example 2

[0236] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.7787E-03 -3.7116E-04 1.7231E-04 -7.3150E-05 2.3884E-05 -5.7976E-06 1.0317E-06 S2 9.0897E-03 -2.8903E-03 1.3392E-03 -5.6708E-04 1.8148E-04 -4.2353E-05 7.2077E-06 S3 -3.9065E-03 -2.0053E-04 6.5755E-04 -4.4780E-04 1.7428E-04 -4.5488E-05 8.3940E-06 S4 -1.3753E-02 2.9491E-03 -7.2000E-04 9.6794E-05 6.4091E-06 -6.9591E-06 1.8643E-06 S5 -3.6549E-03 2.4439E-04 -2.7847E-05 -5.6320E-06 4.2324E-06 -1.4562E-06 3.4431E-07 S6 -3.7008E-03 4.3186E-04 -8.9582E-05 3.0033E-05 -1.0803E-05 3.0162E-06 -6.0701E-07 S7 -1.8629E-03 1.2894E-04 -1.8828E-05 2.5391E-06 3.1170E-08 -1.2854E-07 3.4384E-08 S8 5.8302E-04 -1.2570E-04 7.1639E-05 -2.6174E-05 6.4240E-06 -1.0934E-06 1.3118E-07 S9 6.3969E-02 -1.9556E-02 5.4481E-03 -1.2989E-03 2.5697E-04 -4.1188E-05 5.2363E-06 S10 5.8265E-02 -1.5662E-02 3.5331E-03 -6.2535E-04 8.3309E-05 -7.7890E-06 4.0687E-07 S11 1.0981E-04 -1.5340E-03 4.8009E-04 -1.2361E-04 2.6493E-05 -4.5342E-06 5.9521E-07 S12 -1.0878E-03 -1.1384E-03 3.0698E-04 -6.1880E-05 1.0072E-05 -1.3164E-06 1.3385E-07 S13 8.5364E-05 -1.2866E-03 2.3051E-04 -2.7808E-05 3.6451E-06 -5.3768E-07 7.2558E-08 S14 -8.8342E-04 -8.4985E-04 1.4635E-04 -1.1889E-05 3.9111E-07 2.8600E-08 -2.1308E-09 S15 -7.7591E-03 1.0061E-03 -6.7139E-05 4.5892E-07 4.2302E-07 -5.4301E-08 4.0955E-09 S16 -7.5315E-03 1.0216E-03 -1.0321E-04 7.6794E-06 -4.2206E-07 1.7209E-08 -5.1732E-10 Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.3364E-07 1.2508E-08 -8.3438E-10 3.8606E-11 -1.1760E-12 2.1191E-14 -1.7105E-16 S2 -8.9661E-07 8.1255E-08 -5.2954E-09 2.4140E-10 -7.2992E-12 1.3141E-13 -1.0657E-15 S3 -1.1173E-06 1.0766E-07 -7.4354E-09 3.5852E-10 -1.1452E-11 2.1761E-13 -1.8612E-15 S4 -3.0156E-07 3.2952E-08 -2.4908E-09 1.2869E-10 -4.3432E-12 8.6333E-14 -7.6668E-16 S5 -5.8425E-08 7.1399E-09 -6.2165E-10 3.7528E-11 -1.4893E-12 3.4866E-14 -3.6422E-16 S6 8.7575E-08 -9.0507E-09 6.6337E-10 -3.3617E-11 1.1188E-12 -2.1985E-14 1.9317E-16 S7 -5.1364E-09 5.0071E-10 -3.3104E-11 1.4776E-12 -4.2736E-14 7.2375E-16 -5.4501E-18 S8 -1.1130E-08 6.5969E-10 -2.6363E-11 6.5392E-13 -7.9205E-15 -8.4521E-18 9.2559E-19 S9 -5.1775E-07 3.9011E-08 -2.1842E-09 8.7641E-11 -2.3756E-12 3.8883E-14 -2.8984E-16 S10 7.5068E-09 -3.6466E-09 3.5924E-10 -2.0280E-11 7.0541E-13 -1.4110E-14 1.2475E-16 S11 -5.8413E-08 4.2070E-09 -2.1791E-10 7.8754E-12 -1.8829E-13 2.6773E-15 -1.7162E-17 S12 -1.0247E-08 5.7448E-10 -2.2924E-11 6.2685E-13 -1.1045E-14 1.1149E-16 -4.8063E-19 S13 -7.2930E-09 5.0550E-10 -2.3704E-11 7.3889E-13 -1.4677E-14 1.6823E-16 -8.4713E-19 S14 -1.5217E-10 2.3891E-11 -1.2685E-12 3.6230E-14 -5.8874E-16 5.0726E-18 -1.7600E-20 S15 -2.0980E-10 7.4390E-12 -1.8184E-13 3.0053E-15 -3.2082E-17 1.9984E-19 -5.5218E-22 S16 1.1285E-11 -1.7394E-13 1.8075E-15 -1.1506E-17 3.3925E-20 2.7074E-23 -3.1562E-25

[0237] After simulation test, the axial chromatic aberration curves of the optical focusing lens in the first state, the second state and the third state in Example 2 are as follows: Fig. 6A , Fig. 7A as well as Fig. 8A As shown, it indicates the degree of deviation of the focal point of light of different wavelengths after passing through the optical focusing lens; the astigmatism curves of the optical focusing lens in the first state, the second state and the third state in Example 2 are shown in FIG. Figure 6B , Figure 7B as well as Figure 8B As shown, it represents the degree of meridian image curvature and sagittal image curvature; the distortion curves of the optical focusing lens in the first state, the second state and the third state in Example 2 are respectively as shown Figure 6C , Figure 7C as well as Figure 8C As shown in , it represents the distortion value corresponding to different field of view angles. 6A to 8C It can be seen that the optical focusing lens of Example 2 can achieve good imaging quality at different object distances.

[0238] Example 3

[0239] like Figures 9 to 12C As shown, the optical focusing lens of Example 3 is described. Fig. 9 The structure schematic diagram of the optical focusing lens of Example 3 is shown, wherein the first lens E1 has positive focal power, and the object side surface and the image side surface of the first lens E1 are concave and convex respectively; the second lens E2 has positive focal power, and the object side surface and the image side surface of the second lens E2 are convex and concave respectively; the third lens E3 has negative focal power, and the object side surface and the image side surface of the third lens E3 are convex and concave respectively; the fourth lens E4 has positive focal power, and the object side surface and the image side surface of the fourth lens E4 are convex and convex respectively; the fifth lens E5 has negative focal power, and the object side surface and the image side surface of the fifth lens E5 are concave and convex respectively; the sixth lens E6 has positive focal power, and the object side surface and the image side surface of the sixth lens E6 are convex and concave respectively; the seventh lens E7 has positive focal power, and the object side surface and the image side surface of the seventh lens E7 are concave and convex respectively; the eighth lens E8 has negative focal power, and the object side surface and the image side surface of the eighth lens E8 are concave and concave respectively.

[0240] According to the above relationship, Tables 5 and 6 show the design data of the optical focusing lens of Example 3. Table 5 shows the basic optical parameters of the optical focusing lens of Example 3, where the units of the radius of curvature and thickness are both millimeters; Table 6 shows the high-order coefficient table of each aspherical surface S1 to S16 of the optical focusing lens of Example 3.

[0241] Table 5: Basic optical parameters of the optical focusing lens of Example 3

[0242]

[0243] It should be noted that the OBJ thicknesses of infinity, 1000 and 150 in Table 5 represent the optical focusing lens in Example 3 in the first state, the second state and the third state, respectively; the S8 thicknesses of 0.5140, 0.6264 and 1.3214 in Table 5 represent the axial air space between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 in the optical focusing lens in the first state, the second state and the third state, respectively; the S16 thicknesses of 1.4624, 1.3501 and 0.6550 in Table 5 represent the axial air space between the image side surface of the eighth lens E8 and the object side surface of the light-transmitting sheet E9 in the optical focusing lens in the first state, the second state and the third state, respectively.

[0244] Table 6: Aspheric coefficients of the optical focusing lens of Example 3

[0245]

[0246]

[0247] After simulation testing, the axial chromatic aberration curves of the optical focusing lens in the first state, the second state and the third state in Example 3 are as follows: Fig. 10A , Fig.11A as well as Fig. 12A As shown, it indicates the degree of deviation of the focal point of light of different wavelengths after passing through the optical focusing lens; the astigmatism curves of the optical focusing lens in the first state, the second state and the third state in Example 3 are shown in FIG. Fig. 10B , Fig. 11B as well as Fig. 12B As shown, it represents the degree of meridian image curvature and sagittal image curvature; the distortion curves of the optical focusing lens in the first state, the second state and the third state in Example 3 are respectively as shown Fig. 10C , Fig. 11C as well as Fig. 12C As shown in , it represents the distortion value corresponding to different field of view angles. FIG. 10A to FIG. 12C It can be seen that the optical focusing lens of Example 3 can achieve good imaging quality at different object distances.

[0248] Example 4

[0249] like Figures 13 to 16C As shown, an optical focusing lens of Example 4 is described. Fig.13The structure schematic diagram of the optical focusing lens of Example 4 is shown, wherein the first lens E1 has positive focal power, and the object side surface and the image side surface of the first lens E1 are convex and convex respectively; the second lens E2 has negative focal power, and the object side surface and the image side surface of the second lens E2 are convex and concave respectively; the third lens E3 has negative focal power, and the object side surface and the image side surface of the third lens E3 are convex and concave respectively; the fourth lens E4 has positive focal power, and the object side surface and the image side surface of the fourth lens E4 are convex and convex respectively; the fifth lens E5 has negative focal power, and the object side surface and the image side surface of the fifth lens E5 are concave and convex respectively; the sixth lens E6 has positive focal power, and the object side surface and the image side surface of the sixth lens E6 are convex and concave respectively; the seventh lens E7 has positive focal power, and the object side surface and the image side surface of the seventh lens E7 are convex and convex respectively; the eighth lens E8 has negative focal power, and the object side surface and the image side surface of the eighth lens E8 are concave and concave respectively.

[0250] According to the above relationship, Tables 7 and 8 show the design data of the optical focusing lens of Example 4. Table 7 shows the basic optical parameters of the optical focusing lens of Example 4, where the units of the radius of curvature and thickness are both millimeters; Table 8 shows the high-order coefficient table of each aspherical surface S1 to S16 of the optical focusing lens of Example 4.

[0251] Table 7: Basic optical parameters of the optical focusing lens of Example 4

[0252]

[0253] It should be noted that the OBJ thicknesses of infinity, 1000 and 150 in Table 7 represent the optical focusing lens in Example 4 in the first state, the second state and the third state, respectively; the S8 thicknesses of 0.0498, 0.0872 and 0.2985 in Table 7 represent the axial air space between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 in the optical focusing lens in the first state, the second state and the third state, respectively; the S16 thicknesses of 0.3930, 0.3542 and 0.1462 in Table 7 represent the axial air space between the image side surface of the eighth lens E8 and the object side surface of the light-transmitting sheet E9 in the optical focusing lens in the first state, the second state and the third state, respectively.

[0254] Table 8: Aspheric coefficients of the optical focusing lens of Example 4

[0255]

[0256]

[0257] After simulation test, the axial chromatic aberration curves of the optical focusing lens in the first state, the second state and the third state in Example 4 are as follows: Fig.14A , Fig.15A as well as Fig.16A As shown in FIG. 1 , it indicates the degree of deviation of the focal point of light of different wavelengths after passing through the optical focusing lens; the astigmatism curves of the optical focusing lens in the first state, the second state and the third state in Example 4 are shown in FIG. 1 , respectively. Fig. 14B , Fig. 15B as well as Fig. 16B As shown, it represents the degree of meridional image curvature and sagittal image curvature; the distortion curves of the optical focusing lens in the first state, the second state and the third state in Example 4 are respectively as shown Fig. 14C , Fig. 15C as well as Fig. 16C As shown in , it represents the distortion value corresponding to different field of view angles. FIG. 14A to FIG. 16C It can be seen that the optical focusing lens of Example 4 can achieve good imaging quality at different object distances.

[0258] Example 5

[0259] like Figures 17 to 20C As shown, the optical focusing lens of Example 5 is described. Fig.17 The structure schematic diagram of the optical focusing lens of Example 5 is shown, wherein the first lens E1 has positive focal power, and the object side surface and the image side surface of the first lens E1 are convex and convex respectively; the second lens E2 has negative focal power, and the object side surface and the image side surface of the second lens E2 are convex and concave respectively; the third lens E3 has negative focal power, and the object side surface and the image side surface of the third lens E3 are convex and concave respectively; the fourth lens E4 has positive focal power, and the object side surface and the image side surface of the fourth lens E4 are convex and convex respectively; the fifth lens E5 has negative focal power, and the object side surface and the image side surface of the fifth lens E5 are concave and convex respectively; the sixth lens E6 has positive focal power, and the object side surface and the image side surface of the sixth lens E6 are convex and concave respectively; the seventh lens E7 has positive focal power, and the object side surface and the image side surface of the seventh lens E7 are convex and convex respectively; the eighth lens E8 has negative focal power, and the object side surface and the image side surface of the eighth lens E8 are concave and concave respectively.

[0260] According to the above relationship, Tables 9 and 10 show the design data of the optical focusing lens of Example 5. Table 9 shows the basic optical parameters of the optical focusing lens of Example 5, where the units of the radius of curvature and thickness are both in millimeters; Table 10 shows the high-order coefficient table of each aspherical surface S1 to S16 of the optical focusing lens of Example 5.

[0261] Table 9: Basic optical parameters of the optical focusing lens of Example 5

[0262]

[0263]

[0264] It should be noted that the OBJ thicknesses of infinity, 1000 and 150 in Table 9 represent the optical focusing lens in Example 5 in the first state, the second state and the third state, respectively; the S8 thicknesses of 0.0501, 0.0914 and 0.3400 in Table 9 represent the axial air space between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 in the optical focusing lens in the first state, the second state and the third state, respectively; the S16 thicknesses of 0.4250, 0.3837 and 0.1351 in Table 9 represent the axial air space between the image side surface of the eighth lens E8 and the object side surface of the light-transmitting sheet E9 in the optical focusing lens in the first state, the second state and the third state, respectively.

[0265] Table 10: Aspheric coefficients of the optical focusing lens of Example 5

[0266] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.2717E-02 -2.5200E-02 3.5784E-02 -4.1517E-02 3.5443E-02 -2.2080E-02 1.0117E-02 S2 3.6098E-03 3.9890E-02 -6.6438E-02 5.7927E-02 -2.7223E-02 2.2277E-03 6.0427E-03 S3 -8.0544E-02 9.1195E-02 -1.1387E-01 1.0070E-01 -6.1169E-02 2.2887E-02 -2.6077E-03 S4 -7.9150E-02 3.3759E-02 2.1323E-02 -1.0410E-01 1.6175E-01 -1.5677E-01 1.0546E-01 S5 -3.1357E-02 4.1540E-02 -4.1218E-02 3.7726E-02 -3.2985E-02 2.2832E-02 -1.1215E-02 S6 -4.0898E-02 4.6199E-02 -3.2789E-02 1.6890E-02 -7.1827E-03 2.8425E-03 -1.2180E-03 S7 -2.0166E-02 8.3489E-03 -4.6927E-04 -4.6528E-03 5.8368E-03 -4.1295E-03 1.9550E-03 S8 9.0906E-03 -1.9023E-02 3.6615E-02 -4.4534E-02 3.6537E-02 -2.0992E-02 8.6417E-03 S9 2.1336E-01 -2.3318E-01 2.4473E-01 -2.0985E-01 1.3766E-01 -6.7731E-02 2.4869E-02 S10 1.7518E-01 -1.8429E-01 1.8618E-01 -1.5350E-01 9.6995E-02 -4.6050E-02 1.6319E-02 S11 -6.5056E-02 3.1586E-02 -2.7343E-02 2.8673E-02 -2.6089E-02 1.7569E-02 -8.4915E-03 S12 -5.5469E-02 3.5215E-02 -4.4360E-02 4.9955E-02 -4.2322E-02 2.6005E-02 -1.1588E-02 S13 -3.0414E-03 -4.3409E-03 7.0916E-03 -1.1838E-02 1.3604E-02 -1.0425E-02 5.4965E-03 S14 -8.2290E-03 -8.1429E-03 1.6789E-02 -2.3362E-02 2.2322E-02 -1.4797E-02 6.9518E-03 S15 -4.8101E-02 1.1089E-02 -5.1070E-03 5.3753E-03 -4.5652E-03 2.6188E-03 -1.0387E-03 S16 -4.3547E-02 1.0169E-02 -8.6087E-04 -6.9942E-04 4.3785E-04 -1.4211E-04 3.0806E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 -3.4290E-03 8.5854E-04 -1.5701E-04 2.0424E-05 -1.7930E-06 9.5360E-08 -2.3226E-09 S2 -4.5811E-03 1.8221E-03 -4.6406E-04 7.8167E-05 -8.4655E-06 5.3581E-07 -1.5097E-08 S3 -2.4070E-03 1.6569E-03 -5.5145E-04 1.1300E-04 -1.4469E-05 1.0675E-06 -3.4771E-08 S4 -5.0879E-02 1.7740E-02 -4.4341E-03 7.7443E-04 -8.9703E-05 6.1881E-06 -1.9231E-07 S5 3.6009E-03 -6.2000E-04 -9.9115E-06 3.1668E-05 -7.2466E-06 7.5229E-07 -3.1329E-08 S6 5.4036E-04 -2.0027E-04 5.3735E-05 -9.7624E-06 1.1336E-06 -7.5872E-08 2.2270E-09 S7 -6.4845E-04 1.5275E-04 -2.5435E-05 2.9261E-06 -2.2119E-07 9.8825E-09 -1.9769E-10 S8 -2.5773E-03 5.5724E-04 -8.6395E-05 9.3542E-06 -6.7112E-07 2.8653E-08 -5.5081E-10 S9 -6.7901E-03 1.3678E-03 -2.0000E-04 2.0600E-05 -1.4150E-06 5.8106E-08 -1.0783E-09 S10 -4.2902E-03 8.2753E-04 -1.1483E-04 1.1081E-05 -7.0088E-07 2.5902E-08 -4.1930E-10 S11 2.9437E-03 -7.3090E-04 1.2861E-04 -1.5632E-05 1.2468E-06 -5.8689E-08 1.2351E-09 S12 3.7562E-03 -8.8295E-04 1.4867E-04 -1.7455E-05 1.3563E-06 -6.2677E-08 1.3043E-09 S13 -2.0369E-03 5.3375E-04 -9.8069E-05 1.2320E-05 -1.0051E-06 4.7870E-08 -1.0084E-09 S14 -2.3427E-03 5.6668E-04 -9.7281E-05 1.1534E-05 -8.9594E-07 4.0941E-08 -8.3303E-10 S15 2.9196E-04 -5.8832E-05 8.4773E-06 -8.5611E-07 5.7758E-08 -2.3440E-09 4.3326E-11 S16 -4.7316E-06 5.2317E-07 -4.1430E-08 2.2936E-09 -8.4299E-11 1.8477E-12 -1.8272E-14

[0267] After simulation testing, the axial chromatic aberration curves of the optical focusing lens in the first state, the second state and the third state in Example 5 are as follows: Fig.18A , Fig.19A as well as Fig. 20A As shown, it indicates the degree of deviation of the focal point of light of different wavelengths after passing through the optical focusing lens; the astigmatism curves of the optical focusing lens in the first state, the second state and the third state in Example 5 are shown in FIG. Fig.18B , Fig.19B as well as Fig. 20B As shown, it represents the degree of meridional image curvature and sagittal image curvature; the distortion curves of the optical focusing lens in the first state, the second state and the third state in Example 5 are respectively as shown Fig. 18C , Fig.19C as well as Fig. 20C As shown in , it represents the distortion value corresponding to different field of view angles. FIG. 18A to FIG. 20C It can be seen that the optical focusing lens of Example 5 can achieve good imaging quality at different object distances.

[0268] Example 6

[0269] like Figures 21 to 24C As shown, an optical focusing lens of Example 6 is described. Fig.21The structure schematic diagram of the optical focusing lens of Example 6 is shown, wherein the first lens E1 has positive focal power, and the object side surface and the image side surface of the first lens E1 are convex and convex respectively; the second lens E2 has positive focal power, and the object side surface and the image side surface of the second lens E2 are convex and concave respectively; the third lens E3 has negative focal power, and the object side surface and the image side surface of the third lens E3 are convex and concave respectively; the fourth lens E4 has positive focal power, and the object side surface and the image side surface of the fourth lens E4 are convex and convex respectively; the fifth lens E5 has negative focal power, and the object side surface and the image side surface of the fifth lens E5 are concave and convex respectively; the sixth lens E6 has positive focal power, and the object side surface and the image side surface of the sixth lens E6 are convex and concave respectively; the seventh lens E7 has positive focal power, and the object side surface and the image side surface of the seventh lens E7 are concave and convex respectively; the eighth lens E8 has negative focal power, and the object side surface and the image side surface of the eighth lens E8 are concave and concave respectively.

[0270] According to the above relationship, Tables 11 and 12 show the design data of the optical focusing lens of Example 6. Table 11 shows the basic optical parameters of the optical focusing lens of Example 6, where the units of the radius of curvature and thickness are both millimeters; Table 12 shows the high-order coefficient table of each aspherical surface S1 to S16 of the optical focusing lens of Example 6.

[0271] Table 11: Basic optical parameters of the optical focusing lens of Example 6

[0272]

[0273] It should be noted that the OBJ thicknesses of infinity, 1000 and 150 in Table 11 represent the optical focusing lens in Example 6 in the first state, the second state and the third state, respectively; the S8 thicknesses of 0.0502, 0.0935 and 0.3547 in Table 11 represent the axial air space between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 in the optical focusing lens in the first state, the second state and the third state, respectively; the S16 thicknesses of 0.4456, 0.4023 and 0.1411 in Table 11 represent the axial air space between the image side surface of the eighth lens E8 and the object side surface of the light-transmitting sheet E9 in the optical focusing lens in the first state, the second state and the third state, respectively.

[0274] Table 12: Aspheric coefficients of the optical focusing lens of Example 6

[0275]

[0276]

[0277] After simulation testing, the axial chromatic aberration curves of the optical focusing lens in the first state, the second state and the third state in Example 6 are as follows: Fig.22A , Fig.23A as well as Fig.24A As shown, it indicates the degree of deviation of the focal point of light of different wavelengths after passing through the optical focusing lens; the astigmatism curves of the optical focusing lens in the first state, the second state and the third state in Example 6 are shown in FIG. Fig. 22B , Fig. 23B as well as Fig. 24B As shown, it represents the degree of meridional image curvature and sagittal image curvature; the distortion curves of the optical focusing lens in the first state, the second state and the third state in Example 6 are respectively as shown Fig. 22C , Fig.23C as well as Fig.24C As shown in , it represents the distortion value corresponding to different field of view angles. FIG. 22A to FIG. 24C It can be seen that the optical focusing lens of Example 6 can achieve good imaging quality at different object distances.

[0278] Example 7

[0279] like Figures 25 to 28C As shown, the optical focusing lens of Example 7 is described. Fig.25 The structure schematic diagram of the optical focusing lens of Example 7 is shown, wherein the first lens E1 has positive focal power, and the object side surface and the image side surface of the first lens E1 are convex and convex respectively; the second lens E2 has negative focal power, and the object side surface and the image side surface of the second lens E2 are convex and concave respectively; the third lens E3 has negative focal power, and the object side surface and the image side surface of the third lens E3 are concave and concave respectively; the fourth lens E4 has positive focal power, and the object side surface and the image side surface of the fourth lens E4 are convex and convex respectively; the fifth lens E5 has negative focal power, and the object side surface and the image side surface of the fifth lens E5 are concave and convex respectively; the sixth lens E6 has positive focal power, and the object side surface and the image side surface of the sixth lens E6 are convex and concave respectively; the seventh lens E7 has positive focal power, and the object side surface and the image side surface of the seventh lens E7 are concave and convex respectively; the eighth lens E8 has negative focal power, and the object side surface and the image side surface of the eighth lens E8 are concave and concave respectively.

[0280] According to the above relationship, Table 13 and Table 14 show the design data of the optical focusing lens of Example 7. Table 13 shows the basic optical parameters of the optical focusing lens of Example 7, where the units of the radius of curvature and thickness are both millimeters; Table 14 shows the high-order coefficient table of each aspherical surface S1 to S16 of the optical focusing lens of Example 7.

[0281] Table 13: Basic optical parameters of the optical focusing lens of Example 7

[0282]

[0283]

[0284] It should be noted that the OBJ thicknesses of infinity, 1000 and 150 in Table 13 represent the optical focusing lens in Example 7 in the first state, the second state and the third state, respectively; the S8 thicknesses of 0.0500, 0.0921 and 0.3454 in Table 13 represent the axial air space between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 in the optical focusing lens in the first state, the second state and the third state, respectively; the S16 thicknesses of 0.4303, 0.3883 and 0.1349 in Table 13 represent the axial air space between the image side surface of the eighth lens E8 and the object side surface of the light-transmitting sheet E9 in the optical focusing lens in the first state, the second state and the third state, respectively.

[0285] Table 14: Aspheric coefficients of the optical focusing lens of Example 7

[0286]

[0287]

[0288] After simulation test, the axial chromatic aberration curves of the optical focusing lens in the first state, the second state and the third state in Example 7 are as follows: Fig.26A , Fig.27A as well as Fig.28A As shown in FIG. 1 , it indicates the degree of deviation of the focal point of light of different wavelengths after passing through the optical focusing lens; the astigmatism curves of the optical focusing lens in the first state, the second state and the third state in Example 7 are shown in FIG. 1 , respectively. Fig.26B , Fig.27B as well as Fig.28B As shown, it represents the degree of meridional image curvature and sagittal image curvature; the distortion curves of the optical focusing lens in the first state, the second state and the third state in Example 7 are respectively as shown Fig.26C , Fig.27C as well as Fig.28C As shown in , it represents the distortion value corresponding to different field of view angles. FIG. 26A to FIG. 28C It can be seen that the optical focusing lens of Example 7 can achieve good imaging quality at different object distances.

[0289] In summary, the system optical parameters of the optical focusing lenses in Examples 1 to 7 are specifically shown in Table 15.

[0290] Table 15: System optical parameters of optical focusing lens

[0291] Example Parameters 1 2 3 4 5 6 7 f1(mm) 17.51 18.32 33.94 17.27 13.96 18.41 13.90 f2(mm) -51.56 -60.22 90.00 -43.34 -47.04 90.00 -57.05 f3(mm) -29.60 -30.62 -27.77 -16.01 -12.82 -10.98 -11.85 f4(mm) 7.47 7.53 7.46 3.64 3.97 4.07 3.96 f5(mm) -15.91 -15.47 -15.99 -9.29 -8.92 -9.33 -9.19 f6(mm) 97.44 90.00 90.00 58.88 24.74 24.94 23.53 f7(mm) 32.01 30.10 35.61 8.44 24.16 23.90 26.37 f8(mm) -9.40 -9.35 -9.83 -4.03 -5.53 -5.47 -5.52 fi(mm) 12.79 12.88 12.74 5.99 6.95 7.08 6.94 △f(mm) 2.04 2.05 2.00 0.45 0.64 0.67 0.64 F1(mm) 8.17 8.21 8.17 4.25 4.71 4.81 4.73 F2(mm) -6.65 -6.67 -6.77 -4.28 -4.24 -4.31 -4.28 ImgH(mm) 8.10 8.10 8.10 4.20 4.51 4.51 4.51 F 1.566 1.566 1.566 1.567 1.567 1.567 1.567

[0292] It should be noted that, in Table 15: f1 to f8 represent the effective focal lengths of the first lens E1 to the eighth lens E8 respectively; fi represents the effective focal length of the optical focusing lens when the object distance is infinity; Δf is the difference in effective focal lengths of the optical focusing lens when the object distance is infinity and infinity respectively; F1 is the effective focal length of the fixed lens group G1; F2 is the effective focal length of the focusing lens group G2; ImgH represents the image height of the optical focusing lens; and FNOi represents the aperture coefficient of the optical focusing lens.

[0293] In addition, the optical focusing lenses in Examples 1 to 7 satisfy the conditional expressions shown in Table 16, as shown in Table 16.

[0294] Table 16: Relationships satisfied by optical focusing lenses

[0295]

[0296]

[0297] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0298] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical focusing lens, comprising a first lens barrel and a second lens barrel arranged in sequence from the object side to the image side along the optical axis, Features: The first lens barrel is fixedly equipped with a fixed lens group with positive optical power, which includes a first lens with positive optical power, a second lens with optical power, a third lens with negative optical power and a fourth lens with positive optical power in order from the object side to the image side along the optical axis; the object side surface and the image side surface of the second lens are convex and concave respectively, the image side surface of the third lens is concave; the object side surface and the image side surface of the fourth lens are both convex; and The second lens barrel is fixedly provided with a focusing lens group with negative optical power, wherein the second lens barrel is movably arranged along the optical axis relative to the first lens barrel, and the focusing lens group includes a fifth lens with negative optical power, a sixth lens with positive optical power, a seventh lens with positive optical power, and an eighth lens with negative optical power in order from the object side to the image side along the optical axis; the object side surface and the image side surface of the fifth lens are respectively a concave surface and a convex surface, the object side surface and the image side surface of the sixth lens are respectively a convex surface and a concave surface, the image side surface of the seventh lens is a convex surface, and the object side surface and the image side surface of the eighth lens are both concave surfaces; The optical focusing lens satisfies the following relationship: 1.50<|△f| / Tw<1.90; -1.95<fi / F2≤-1.40; Wherein, △f is the effective focal length difference of the optical focusing lens when the object distance is infinity and infinity respectively; Tw is the on-axis air distance between the fixed lens group and the focusing lens group when the object distance is infinity; fi is the effective focal length of the optical focusing lens when the object distance is infinity; F2 is the effective focal length of the focusing lens group.

2. The optical focusing lens according to claim 1, It is characterized in that The fixed lens group and the focusing lens group satisfy the relationship: -1.25<F1 / F2<-0.95; Wherein, F1 is the effective focal length of the fixed lens group; F2 is the effective focal length of the focusing lens group.

3. The optical focusing lens according to claim 1, It is characterized in that The focusing lens group satisfies the relationship: -1.30<F2 / TD2<-0.90; Wherein, F2 is the effective focal length of the focusing lens group; TD2 is the axial distance between the object side surface of the fifth lens and the image side surface of the eighth lens.

4. The optical focusing lens according to claim 1, It is characterized in that The focusing lens group satisfies the relationship: 0.90<f8 / F2≤1.45; Among them, f8 is the effective focal length of the eighth lens; F2 is the effective focal length of the focusing lens group.

5. The optical focusing lens according to claim 1, It is characterized in that The focusing lens group satisfies the relationship: 1.60<f5 / f8<2.35; Wherein, f5 is the effective focal length of the fifth lens; f8 is the effective focal length of the eighth lens.

6. The optical focusing lens according to claim 1, It is characterized in that The focusing lens group satisfies the relationship: -6.20<f7 / F2<-1.95; Wherein, f7 is the effective focal length of the seventh lens; F2 is the effective focal length of the focusing lens group.

7. The optical focusing lens according to claim 1, It is characterized in that The fixed mirror group satisfies the relationship: 2.0≤F1 / CT4<2.75; Wherein, F1 is the effective focal length of the fixed lens group; CT4 is the center thickness of the fourth lens.

8. The optical focusing lens according to claim 1, It is characterized in that The fixed mirror group satisfies the relationship: 2.10<f1 / F1<4.20; Among them, f1 is the effective focal length of the first lens; F1 is the effective focal length of the fixed lens group.

9. The optical focusing lens according to claim 1, It is characterized in that The fixed mirror group satisfies the relationship: -3.85<f3 / F1<-2.25; Among them, f3 is the effective focal length of the third lens; F1 is the effective focal length of the fixed lens group.

10. The optical focusing lens according to claim 1, It is characterized in that The fixed mirror group satisfies the relationship: 2.30<f1 / f4≤4.75; Wherein, f1 is the effective focal length of the first lens; f4 is the effective focal length of the fourth lens.

11. The optical focusing lens according to claim 1, It is characterized in that The fixed mirror group satisfies the relationship: 2.85<TD1 / (T23+T34)<4.45; Wherein, TD1 is the on-axis distance between the object side surface of the first lens and the image side surface of the fourth lens; T23 is the on-axis air space between the second lens and the third lens; and T34 is the on-axis air space between the third lens and the fourth lens.

12. The optical focusing lens according to claim 1, It is characterized in that The optical focusing lens satisfies the relationship: 1.80<|△f| / |△T|≤2.55; Wherein, Δf is the effective focal length difference of the optical focusing lens when the object distance is infinite and infinitely close respectively; ΔT is the on-axis air spacing difference between the fixed lens group and the focusing lens group when the object distance is infinitely close and infinitely close.

13. The optical focusing lens according to claim 1, It is characterized in that The optical focusing lens satisfies the relationship: -3.40<F2 / |△f|≤-3.25; Wherein, F2 is the effective focal length of the focusing lens group; Δf is the effective focal length difference of the optical focusing lens when the object distance is infinite and infinitely close respectively.

14. The optical focusing lens according to claim 13, It is characterized in that The focusing lens group satisfies the relationship: -14.65≤f6 / F2<-13.25; Wherein, f6 is the effective focal length of the sixth lens; F2 is the effective focal length of the focusing lens group.

15. The optical focusing lens according to claim 13, It is characterized in that The focusing lens group satisfies the relationship: 0.80<T56 / (CT5+CT6)<0.95; Wherein, T56 is the on-axis air space between the fifth lens and the sixth lens; CT5 is the center thickness of the fifth lens; and CT6 is the center thickness of the sixth lens.

16. The optical focusing lens according to claim 1, It is characterized in that The optical focusing lens satisfies the relationship: 6.90<TD1 / |△f|<8.90; Wherein, TD1 is the on-axis distance between the object side surface of the first lens and the image side surface of the fourth lens; Δf is the effective focal length difference of the optical focusing lens when the object distance is infinite and infinitely close respectively.

17. The optical focusing lens according to claim 16, It is characterized in that The fourth lens and the fifth lens satisfy the relationship: 19.15<(R8+R9) / (R8-R9)<28.85; Wherein, R8 is the curvature radius of the image side surface of the fourth lens; R9 is the curvature radius of the object side surface of the fifth lens.

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