Optical focusing lens

Abstract

The present application provides an optical focusing lens. The optical focusing lens comprises a first lens barrel and a second lens barrel arranged in sequence from an object side to an image side along an optical axis; the first lens barrel is fixed with a fixed lens group having positive refractive power, and sequentially comprises a first lens having positive refractive power, a second lens having refractive power, a third lens having negative refractive power and a fourth lens having positive refractive power from the object side to the image side along the optical axis; the second lens barrel is fixed with a focusing lens group having negative refractive power, wherein the focusing lens group is movably arranged relative to the fixed lens group along the optical axis, and the focusing lens group sequentially comprises a fifth lens having negative refractive power, a sixth lens having positive refractive power, a seventh lens having positive refractive power and an eighth lens having negative refractive power from the object side to the image side along the optical axis; the optical focusing lens satisfies the following relationship: 1.5<|△f| / Tw<1.9;‑2.0<fi / F2<‑1.3.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical lens, in particular to an optical focusing lens. BACKGROUND

[0002] In recent years, with the rapid development of science and technology, the market puts forward more new demands for cameras suitable for electronic products, especially some professional cameras used by photographers. Generally, when a photographer uses a fixed-point focusing camera, he usually focuses on the center or other specific positions, but this situation is only applicable to static objects or scenes. However, in some cases of shooting dynamic objects, the focusing function of the fixed-point focusing camera is not strong enough, and many times it cannot be handled well, because the fixed-point hovering time of dynamic objects is too short, and the focusing time of the existing camera is relatively long, so the object may not be captured well during single-point focusing; therefore, how to complete the focusing in time becomes extremely important. SUMMARY

[0003] An advantage of the present application is to provide an optical focusing lens which can achieve precise and rapid automatic focusing effect in different shooting environments, thereby improving the shooting experience.

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

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

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

[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 zoom lens at the object distance of infinity and infinity close respectively; Tw is the axial air gap of the fixed lens group and the focusing lens group at the object distance of infinity close; fi is the effective focal length of the optical zoom lens at the object distance of infinity; F2 is the effective focal length of the focusing lens group.

[0009] In this way, on the one hand, the optical zoom lens of the present application divides the lens group into two groups, the fixed lens group and the focusing lens group, and focuses by moving the focusing lens group, so that the lenses in a single lens group can not move relative to each other during zooming, which can simplify the complexity of the mechanism and ensure the feasibility of moving focusing of the focusing lens group.

[0010] On the other hand, the optical zoom lens of the present application controls the relationship between the difference △f of the effective focal length of the system at the two object distances and the axial air gap Tw (i.e. the maximum air gap between the groups) of the fixed lens group and the focusing lens group at the object distance of infinity close within a reasonable range, and also controls the ratio between the effective focal length fi of the system at the object distance of infinity and the effective focal length F2 of the focusing lens group within a reasonable range. By different collocation of the two lens groups and the optical power, not only can clear imaging be achieved from very close object distance to infinity, but also the axial distance between the fixed lens group and the focusing lens group can be effectively regulated, which ensures that the moving range of the focusing lens group is minimized, thereby greatly reducing the size of the lens and achieving miniaturization and lightness of the lens.

[0011] According to an 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] In this way, the optical zoom 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, which ensures the feasibility of moving focusing of the focusing lens group by reasonable distribution of the optical power between the two groups, and is also conducive to aberration correction of the optical system and improves the imaging quality of the optical system. If the ratio is lower than the lower limit, the optical power of the fixed lens group becomes weaker, which makes the small diameter of the fixed lens group insufficient and hinders the miniaturization of the lens barrel. If the ratio is higher than the upper limit, the optical power of the fixed lens group becomes stronger, which makes it difficult to correct various aberrations such as spherical aberration and coma, and is not conducive to achieving higher optical performance.

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

[0015] F2 is an effective focal length of the focusing lens group; TD2 is an on-axis distance between the object side of the fifth lens and the image side of the eighth lens.

[0016] In this way, the optical focusing lens of the present application, 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, is conducive to reducing the chromatic aberration and aberration of the optical system, while also being conducive to reducing the temperature drift sensitivity of the system and increasing the stability of the system focusing.

[0017] According to an embodiment of the present application, the focusing lens group satisfies the relationship: 0.90

[0018] F2 is an effective focal length of the focusing lens group; TD2 is an on-axis distance between the object side of the fifth lens and the image side of the eighth lens.

[0019] In this way, the optical focusing lens of the present application, 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, is conducive to reducing the chromatic aberration and aberration of the optical system, while also being conducive to reducing the temperature drift sensitivity of the system and increasing the stability of the system focusing.

[0020] According to an embodiment of the present application, the focusing lens group satisfies the relationship: 1.60

[0021] F2 is an effective focal length of the focusing lens group; TD2 is an on-axis distance between the object side of the fifth lens and the image side of the eighth lens.

[0022] In this way, the optical focusing lens of the present application, 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, is conducive to reducing the chromatic aberration and aberration of the optical system, while also being conducive to reducing the temperature drift sensitivity of the system and increasing the stability of the system focusing.

[0023] According to an embodiment of the present application, the focusing lens group satisfies the relationship: -6.20

[0024] F2 is an effective focal length of the focusing lens group; TD2 is an on-axis distance between the object side of the fifth lens and the image side of the eighth lens.

[0025] In this way, the optical focusing lens of the present application, 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, is conducive to reducing the chromatic aberration and aberration of the optical system, while also being conducive to reducing the temperature drift sensitivity of the system and increasing the stability of the system focusing.

[0026] According to an embodiment of the present application, the focusing lens group satisfies the relationship: 2.0

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

[0028] In this way, the optical zoom lens of the present application can not only avoid the problem that the center thickness of the fourth lens is too thick to form the lens, but also solve the problem that the optical system is prone to interfere with the focusing lens group during focusing. Meanwhile, the light of the fixed lens group can be better transitioned, so that the light emitted through the fixed lens group can better cooperate with the focusing lens group to achieve different focus distances. If the ratio is lower than the lower limit, the thickness of the fourth lens can be too thick, which is not conducive to the formation of the lens and affects the light deflection degree of the lens, which can cause scattering and refraction of light, resulting in problems such as chromatic aberration and distortion of the image. If the ratio is higher than the upper limit, the power of the fixed lens group becomes stronger, and the correction of various aberrations such as spherical aberration and coma becomes difficult, which is not conducive to achieving high optical performance.

[0029] According to an embodiment of the present application, the fixed lens group satisfies the relationship: 2.10 < f1 / F1 < 4.20;

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

[0031] In this way, the optical zoom 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, and by reasonably distributing the power, not only can the correction effect of spherical aberration and coma be improved, but also the convergence ability of light can be enhanced, which is conducive to improving the relative luminance, enhancing the recognition effect, and further improving the optical imaging quality to adapt to the shooting requirements in various complex environments.

[0032] According to an embodiment of the present application, the fixed lens group satisfies the relationship: -3.85 < f3 / F1 < -2.25;

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

[0034] In this way, the optical zoom lens of the present application can achieve reasonable matching of the power by restricting 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 aberration of the entire optical zoom lens and is conducive to improving the imaging quality of the optical system.

[0035] According to an embodiment of the present application, the fixed lens group 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] In this way, the optical focusing lens of the present application is beneficial to adjusting the refractive power distribution of the lens, is helpful to the smooth transition of light, is beneficial to compressing the volume of the lens and correcting aberration, so as to improve the imaging quality, by limiting the ratio between the effective focal length of the first lens and the effective focal length of the fourth lens.

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

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

[0040] In this way, the optical focusing lens of the present application can effectively control the distance between lenses, while ensuring the processability of the lens, so as to make the optical focusing lens more compact, avoid the problem of bearing and assembly caused by too close lens spacing, and ensure the miniaturization and light weight of the lens, by limiting the ratio between the on-axis optical length TD1 of the fixed lens group and the sum (T23+T34) of the on-axis air gaps between the second lens, the third lens and the fourth lens.

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

[0042] Wherein, △f is the effective focal length difference of the optical focusing lens when the object distance is infinite and infinite close; △T is the on-axis air gap difference of the fixed lens group and the focusing lens group when the object distance is infinite close and infinite close.

[0043] In this way, the optical focusing lens of the present application can effectively limit the movement of the focusing lens group during the focusing process when the object distance changes from infinite to infinite close, so as to realize the miniaturization of the lens, by limiting the relationship between the effective focal length difference △f of the optical focusing lens when the object distance is infinite and infinite close and the movement △T of the focusing lens group.

[0044] According to an 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; △f is the effective focal length difference of the optical focusing lens when the object distance is infinite and infinite close.

[0046] In this way, the optical zoom lens of the present application realizes reasonable matching of optical powers by constraining the effective focal length of the zoom lens group and the relationship between the effective focal length difference Δf of the optical zoom lens at infinite object distance and at infinite close distance, so that the zoom lens group can effectively realize the focusing function at different object distances; meanwhile, the influence of high-order aberration of the lens on the imaging quality can be largely corrected.

[0047] According to an embodiment of the present application, the zoom 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 zoom lens group.

[0049] In this way, the optical zoom lens of the present application controls the ratio between the effective focal length of the sixth lens and the effective focal length of the zoom lens group within a reasonable range, which is conducive to correcting distortion and reducing the degree of deformation of the image, so as to effectively restore the true appearance of the object.

[0050] According to an embodiment of the present application, the zoom lens group satisfies the relationship: 0.80

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

[0052] In this way, the optical zoom lens of the present application controls the ratio between the on-axis air gap between the fifth lens and the sixth lens and the sum of the center thicknesses of the fifth lens and the sixth lens within a reasonable range, which can effectively control the gap and center thickness of the fifth lens and the sixth lens, is conducive to ensuring the processability and assembly of the fifth lens and the sixth lens, preventing the problem that the fifth lens and the sixth lens cannot be processed due to being too thin, and avoiding the problem that the fifth lens and the sixth lens cannot be assembled due to being too close.

[0053] According to an embodiment of the present application, the optical zoom lens satisfies the relationship: 6.90

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

[0055] In this way, the optical zoom lens can ensure the zooming capability of the optical zoom lens at different object distances, so that the deflection angle of light is controlled within a certain range, which is conducive to reducing the system spherical aberration and coma; meanwhile, the lenses of the imaging part of the lens can be more compact, thereby reducing the influence of stray light on the imaging quality.

[0056] According to an 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; and R9 is the curvature radius of the object side surface of the fifth lens.

[0058] In this way, the optical zoom lens can ensure the zooming capability of the optical zoom lens at different object distances, so that the deflection angle of light is controlled within a certain range, which is conducive to reducing the system spherical aberration and coma; meanwhile, the lenses of the imaging part of the lens can be more compact, thereby reducing the influence of stray light on the imaging quality.

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

[0060] a photosensitive assembly; and

[0061] The optical zoom lens is arranged on the light-receiving side of the photosensitive assembly. BRIEF DESCRIPTION OF DRAWINGS

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

[0063] FIG. 1B shows an example one of the optical zoom lens in the camera module according to the above embodiment of the present application;

[0064] FIG. 2A is an axial chromatic aberration curve schematic diagram of the optical zoom lens according to the above example one of the present application when in a first state;

[0065] FIG. 2B is an astigmatism curve schematic diagram of the optical zoom lens according to the above example one of the present application when in the first state;

[0066] FIG. 2C is a distortion curve schematic diagram of the optical zoom lens according to the above example one of the present application when in the first state;

[0067] FIG. 3A This is a schematic diagram of the on-axis chromatic aberration curve of the optical focusing lens in the second state according to Example 1 of this application.

[0068] FIG. 3B This is a schematic diagram of the astigmatism curve of the optical focusing lens in the second state according to Example 1 of this application.

[0069] FIG. 3C This is a schematic diagram of the distortion curve of the optical focusing lens in the second state according to Example 1 of this application;

[0070] FIG. 4A This is a schematic diagram of the on-axis chromatic aberration curve of the optical focusing lens in the third state according to Example 1 of this application.

[0071] FIG. 4B This is a schematic diagram of the astigmatism curve of the optical focusing lens in the third state according to Example 1 of this application.

[0072] FIG. 4C This is a schematic diagram of the distortion curve of the optical focusing lens in the third state according to Example 1 of this application.

[0073] FIG. 5 This is Example 2 of the optical focusing lens in the camera module according to the above embodiments of this application;

[0074] FIG. 6A This is a schematic diagram of the on-axis chromatic aberration curve of the optical focusing lens in the first state according to Example 2 of this application;

[0075] FIG. 6B This is a schematic diagram of the astigmatism curve of the optical focusing lens in the first state according to Example 2 of this application.

[0076] FIG. 6C This is a schematic diagram of the distortion curve of the optical focusing lens in the first state according to Example 2 of this application;

[0077] FIG. 7A This is a schematic diagram of the on-axis chromatic aberration curve of the optical focusing lens in the second state according to Example 2 of this application;

[0078] FIG. 7B This is a schematic diagram of the astigmatism curve of the optical focusing lens in the second state according to Example 2 of this application.

[0079] FIG. 7C This is a schematic diagram of the distortion curve of the optical focusing lens in the second state according to Example 2 of this application;

[0080] FIG. 8Ais an axial chromatic aberration curve schematic diagram of the optical focusing lens according to the above example two of the present application in the third state;

[0081] FIG. 8B is an astigmatism curve schematic diagram of the optical focusing lens according to the above example two of the present application in the third state;

[0082] FIG. 8C is a distortion curve schematic diagram of the optical focusing lens according to the above example two of the present application in the third state;

[0083] FIG. 9 is an example three of the optical focusing lens in the camera module according to the above embodiments of the present application;

[0084] FIG. 10A is an axial chromatic aberration curve schematic diagram of the optical focusing lens according to the above example three of the present application in the first state;

[0085] FIG. 10B is an astigmatism curve schematic diagram of the optical focusing lens according to the above example three of the present application in the first state;

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

[0087] FIG. 11A is an axial chromatic aberration curve schematic diagram of the optical focusing lens according to the above example three of the present application in the second state;

[0088] FIG. 11B is an astigmatism curve schematic diagram of the optical focusing lens according to the above example three of the present application in the second state;

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

[0090] FIG. 12A is an axial chromatic aberration curve schematic diagram of the optical focusing lens according to the above example three of the present application in the third state;

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

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

[0093] FIG. 13 is an example four of the optical focusing lens in the camera module according to the above embodiments of the present application;

[0094] FIG. 14A is an axial chromatic aberration curve schematic diagram of the optical focusing lens according to the above example four of the present application when in the first state;

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

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

[0097] FIG. 15A is an axial chromatic aberration curve schematic diagram of the optical focusing lens according to the above example four of the present application when in the second state;

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

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

[0100] FIG. 16A is an axial chromatic aberration curve schematic diagram of the optical focusing lens according to the above example four of the present application when in the third state;

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

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

[0103] FIG. 17 is an example five of the optical focusing lens in the camera module according to the above embodiments of the present application;

[0104] FIG. 18A is an axial chromatic aberration curve schematic diagram of the optical focusing lens according to the above example five of the present application when in the first state;

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

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

[0107] FIG. 19Ais an axial chromatic aberration curve schematic diagram of the optical focusing lens according to the above example five of the present application in the second state;

[0108] FIG. 19B is an astigmatism curve schematic diagram of the optical focusing lens according to the above example five of the present application in the second state;

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

[0110] FIG. 20A is an axial chromatic aberration curve schematic diagram of the optical focusing lens according to the above example five of the present application in the third state;

[0111] FIG. 20B is an astigmatism curve schematic diagram of the optical focusing lens according to the above example five of the present application in the third state;

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

[0113] FIG. 21 is an example six of the optical focusing lens in a camera module according to the above embodiments of the present application;

[0114] FIG. 22A is an axial chromatic aberration curve schematic diagram of the optical focusing lens according to the above example six of the present application in the first state;

[0115] FIG. 22B is an astigmatism curve schematic diagram of the optical focusing lens according to the above example six of the present application in the first state;

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

[0117] FIG. 23A is an axial chromatic aberration curve schematic diagram of the optical focusing lens according to the above example six of the present application in the second state;

[0118] FIG. 23B is an astigmatism curve schematic diagram of the optical focusing lens according to the above example six of the present application in the second state;

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

[0120] FIG. 24A is an axial chromatic aberration curve schematic diagram of the optical focusing lens according to the above example six of the present application in the third state;

[0121] FIG. 24B is a schematic view of astigmatism curve of the optical focusing lens according to the above example six of the present application when the optical focusing lens is in the third state;

[0122] FIG. 24C is a schematic view of distortion curve of the optical focusing lens according to the above example six of the present application when the optical focusing lens is in the third state;

[0123] FIG. 25 is an example seven of the optical focusing lens in the camera module according to the above embodiments of the present application;

[0124] FIG. 26A is a schematic view of axial chromatic aberration curve of the optical focusing lens according to the above example seven of the present application when the optical focusing lens is in the first state;

[0125] FIG. 26B is a schematic view of astigmatism curve of the optical focusing lens according to the above example seven of the present application when the optical focusing lens is in the first state;

[0126] FIG. 26C is a schematic view of distortion curve of the optical focusing lens according to the above example seven of the present application when the optical focusing lens is in the first state;

[0127] FIG. 27A is a schematic view of axial chromatic aberration curve of the optical focusing lens according to the above example seven of the present application when the optical focusing lens is in the second state;

[0128] FIG. 27B is a schematic view of astigmatism curve of the optical focusing lens according to the above example seven of the present application when the optical focusing lens is in the second state;

[0129] FIG. 27C is a schematic view of distortion curve of the optical focusing lens according to the above example seven of the present application when the optical focusing lens is in the second state;

[0130] FIG. 28A is a schematic view of axial chromatic aberration curve of the optical focusing lens according to the above example seven of the present application when the optical focusing lens is in the third state;

[0131] FIG. 28B is a schematic view of astigmatism curve of the optical focusing lens according to the above example seven of the present application when the optical focusing lens is in the third state;

[0132] FIG. 28C is a schematic view of distortion curve of the optical focusing lens according to the above example seven of the present application when the optical focusing lens is in the third state.

[0133] Main element symbol explanation: 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 transmission sheet.

[0134] The above main element symbol explanation further details the present application in combination with the drawings and the specific embodiments. DETAILED DESCRIPTION

[0135] The following description is provided to enable those skilled in the art to realize the present application. The preferred embodiments in the following description are only examples, and other obvious modifications can be made by those skilled in the art. The basic principles of the present application defined in the following description can be applied to other embodiments, modifications, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.

[0136] Those skilled in the art should understand that in the disclosure of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0137] In the present application, the term "one" in the claims and the specification should be understood as "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple. Unless it is explicitly shown in the disclosure of the present application 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 number.

[0138] In the description of the present application, it should be understood that "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through a medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0139] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0140] It is considered that in some cases of shooting dynamic objects, the focusing function of the existing focusing camera is not powerful enough, and many times it cannot be handy, because the fixed point hovering time of dynamic objects is too short, and the focusing time of the existing camera is relatively long, and the single point focusing may still not be able to capture the object well. Therefore, the present application creatively proposes an optical focusing lens and a camera module, which can realize precise and fast automatic focusing effect in different shooting environments, which is beneficial to improve the shooting experience.

[0141] Specifically, with reference to the drawings of the specification of the present application FIGS. 1A-28C According to one embodiment of the present application, a camera module can include an optical focusing lens and a photosensitive component (not shown in the figure), the optical focusing lens is arranged on the photosensitive side of the photosensitive component, so that the external light is first transmitted through the optical focusing lens and then modulated into 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 can 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 be repeated here.

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

[0143] In particular, the optical zoom 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 zoom lens respectively at the object distance of infinity (extremely far) and infinity (extremely close); Tw is the axial air gap of the fixed lens group G1 and the zoom lens group G2 at the object distance of infinity close; fi is the effective focal length of the optical zoom lens at the object distance of infinity; F2 is the effective focal length of the zoom lens group G2.

[0145] Notably, on the one hand, the optical zoom lens of the present application divides the lens group into two groups, the fixed lens group G1 and the zoom lens group G2, and focuses by moving the zoom lens group G2, so that the lenses in a single lens group can not move relative to each other during zooming, which can simplify the complexity of the mechanism and ensure the feasibility of moving the zoom lens group G2 for focusing.

[0146] On the other hand, the optical zoom lens of the present application controls the relationship between the difference △f in the system effective focal length at the two object distances and the axial air gap Tw (i.e. the maximum air gap between the groups) of the fixed lens group G1 and the zoom lens group G2 at the object distance of infinity close to be between 1.50 and 1.90, and also controls the ratio between the system effective focal length fi at the object distance of infinity and the effective focal length F2 of the zoom lens group to be between -1.95 and -1.40. By different combinations of the two lens groups and the refractive power, not only can clear images be obtained from very close object distances to infinity, but also the axial distance between the fixed lens group G1 and the zoom lens group G2 can be effectively controlled, ensuring that the moving range of the zoom lens group G2 is minimized, thereby greatly reducing the size of the lens, 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; and 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; and 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≤|△f| / 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 becomes shorter, 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 can further include other components such as filters, spacers or pressure rings, but is not limited thereto, and the present application will not be described hereinafter.

[0150] Exemplarily, as shown in FIGS. 1B-25 The optical focusing lens can further include a light-transmitting sheet E9 located between the focusing lens group G2 and the imaging surface of the optical focusing lens, so as to filter the light rays exiting through the focusing lens and protect the photosensitive surface of the photosensitive assembly.

[0151] Optionally, the fixed lens group G1 and the focusing lens group G2 satisfy the relationship: -1.25

[0152] F1 is the effective focal length of the fixed lens group G1; and 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 through reasonable distribution of the optical power between the two groups, the feasibility of moving focusing of the focusing lens group G2 is ensured, while the aberration correction of the optical system is facilitated, and the imaging quality of the optical system is improved. If it is lower than the lower limit, the optical power of the fixed lens group G1 becomes weaker, the small aperture becomes insufficient, and the miniaturization of the lens barrel is hindered; if it is higher than the upper limit, the optical power of the fixed lens group G1 becomes stronger, and the correction of various aberrations such as spherical aberration and coma 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 an embodiment of the present application, the focusing lens group G2 satisfies the relationship: -1.30

[0156] Wherein, F2 is the effective focal length of the focusing lens group G2; TD2 is the on-axis distance between the object side of the fifth lens E5 and the image side 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 to be between -1.30 and -0.90, which is conducive to reducing the chromatic aberration and aberration of the optical system, while also facilitating the reduction of the temperature drift sensitivity of the system, and increasing the stability of the system focusing.

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

[0159] According to an embodiment of the present application, the focusing lens group G2 satisfies the relationship: 0.90

[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 to be between 0.90 and 1.45, which is conducive to reducing the aberration and coma of the optical system, balancing the optical distortion, increasing the resolving power of the optical focusing lens, and further 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 an 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; and 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 to be between 1.60 and 2.35, which is beneficial to the smooth transition of light rays, so as to correct various aberrations of the optical system, and further improve the imaging quality.

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

[0167] According to an 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; and 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 to be between -6.20 and -1.95, which is beneficial to the correction of aberrations of the optical system, improves the imaging quality of the optical system, and effectively balances 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 lens 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; and CT4 is the center thickness of the fourth lens E4.

[0173] In other words, the optical zoom lens of the present application can not only avoid the problem of the center thickness of the fourth lens E4 being too thick to be shaped, but also solve the problem of the optical system being interfered with by the focusing lens group G2 during focusing, 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. Meanwhile, the light of the fixed lens group G1 can be better transitioned, so that the light exiting via the fixed lens group G1 can better cooperate with the focusing lens group G2 to achieve different object distance focusing. If it is lower than the lower limit, the fourth lens E4 can be too thick, which is not conducive to the shaping of the lens, and also affects the light deflection degree of the lens, which can cause scattering and refraction of light, resulting in problems such as chromatic aberration and distortion of the image. If it is higher than the upper limit, the power of the fixed lens group G1 becomes stronger, and the correction of various aberrations such as spherical aberration and coma becomes difficult, which is not conducive to achieving higher optical performance.

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

[0175] According to an embodiment of the present application, the fixed lens group G1 satisfies the relationship: 2.10

[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 zoom 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 to between 2.10 and 4.20, which, by reasonably distributing the power, not only improves the correction effect of spherical aberration and coma, but also enhances the convergence ability of light, which is conducive to improving the relative luminance, enhancing the recognition effect, and further improving the optical imaging quality to adapt to the shooting requirements of various complex environments.

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

[0179] According to an embodiment of the present application, the fixed lens group G1 satisfies the relationship: -3.85

[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 zoom lens of the present application can realize reasonable matching of optical power by restricting the ratio between the effective focal length of the third lens E3 and the effective focal length of the fixed lens group G1 to be between -3.85 and -2.25, which plays an important role in correcting the aberration of the entire optical zoom lens and is conducive to improving the imaging quality of the optical system.

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

[0183] According to an embodiment of the present application, the fixed lens group G1 satisfies the relationship: 2.30

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

[0185] In other words, the optical zoom lens of the present application can realize reasonable matching of optical power by restricting the ratio between the effective focal length of the third lens E3 and the effective focal length of the fixed lens group G1 to be between -3.85 and -2.25, which plays an important role in correcting the aberration of the entire optical zoom lens and is conducive to improving the imaging quality of the optical system.

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

[0187] According to an embodiment of the present application, the fixed lens group G1 satisfies the relationship: 2.85

[0188] wherein TD1 is the on-axis distance between the object side of the first lens E1 and the image side of the fourth lens E4; T23 is the on-axis air gap between the second lens E2 and the third lens E3; and T34 is the on-axis air gap between the third lens E3 and the fourth lens E4.

[0189] In other words, the optical zoom lens of the present application can realize reasonable matching of optical power by restricting the ratio between the effective focal length of the third lens E3 and the effective focal length of the fixed lens group G1 to be between -3.85 and -2.25, which plays an important role in correcting the aberration of the entire optical zoom lens and is conducive to improving the imaging quality of the optical system.

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

[0191] According to one 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 infinite close; △T is the axial air gap difference of the fixed lens group G1 and the focusing lens group G2 when the object distance is infinite close and infinite close.

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

[0194] Preferably, the optical focusing lens satisfies the relationship: 1.82≤|△f| / |△T|≤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; △f is the effective focal length difference of the optical focusing lens when the object distance is infinite and infinite close.

[0197] In other words, by limiting 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 infinite close to be between -3.40 and -3.25, the optical focusing lens of the present application achieves a reasonable matching of optical power, so that the focusing lens group G2 can effectively realize the focusing function at different object distances; at the same time, it can also correct the influence of high-order aberrations on the imaging quality to a great extent.

[0198] Preferably, the optical focusing lens satisfies the relationship: -3.39≤F2 / |△f|≤-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, by controlling the ratio between the effective focal length of the sixth lens E6 and the effective focal length of the focusing lens group G2 to be between -14.65 and -13.25, the optical focusing lens of the present application is conducive to correcting distortion and reducing the degree of deformation of the image, so as to effectively restore the true appearance of the object.

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

[0203] According to an embodiment of the present application, the focus lens group G2 satisfies the relationship: 0.80

[0204] wherein T56 is the on-axis air separation 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, by controlling the ratio of the on-axis air separation 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 to be between 0.80 and 0.95, the optical focus lens of the present application can effectively control the gap and the center thickness of the fifth lens E5 and the sixth lens E6, which is beneficial to guarantee the processability and the assembly of the fifth lens E5 and the sixth lens E6, prevent the problem that the fifth lens E5 and the sixth lens E6 cannot be processed due to being too thin, and avoid the problem that the fifth lens E5 and the sixth lens E6 cannot be assembled due to being too close.

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

[0207] According to an embodiment of the present application, the optical focus lens satisfies the relationship: 6.90

[0208] wherein TD1 is the on-axis distance between the object side of the first lens E1 and the image side of the fourth lens E4; and △f is the effective focal length difference of the optical focus lens when the object distance is infinity and infinity, respectively.

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

[0210] Preferably, the optical focus lens satisfies the relationship: 6.94≤TD1 / |△f|≤8.86.

[0211] According to one 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 zoom lens of the present application, by constraining the sum-difference ratio of the curvature radius 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, is conducive to converging light rays, better corrects the astigmatism and various aberrations such as coma, spherical aberration and the like 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, one embodiment of the present application further provides an electronic device, which can include the above-mentioned camera module and a processor (not shown in the figure), the camera module being communicatively connected to the processor, for acquiring image data and inputting the image data to the processor for processing. It can be understood that the electronic device mentioned in the present application can be but is not limited to a device such as a mobile phone installed with the camera module, and the present application will not be described in detail.

[0216] Some specific but non-limiting examples of embodiments of the present application will be described in more detail below with reference to the accompanying drawings. It should be noted that in the following examples, there are first, second and third states, and the curvature radii, central thicknesses and high-order term coefficients of the lens surface of the first lens E1 to the eighth lens E8 of the optical zoom lens in the first state, the second state and the third state in the same example 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 zoom lens in the first state, the second state and the third state is in turn infinite, 1000mm and 150mm, and correspondingly the focusing lens group G2 moves along the optical axis in the direction away from the fixed lens group G1, so that the on-axis air gap 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 one to seven is applicable to all embodiments of the present application.

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

[0218] Example 1

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

[0220] Based on the relationships above, Tables 1 and 2 show the design data for 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 for radius of curvature and thickness are millimeters; Table 2 shows the higher-order coefficients of the aspherical S1 to S16 of the optical focusing lens of Example 1.

[0221] Table 1: Basic Optical Parameters of the Focusing Lens in Example 1

[0222]

[0223] It is to be noted that the OBJ thicknesses in Table 1 are infinite, 1000 and 150, which represent the optical focusing lens in Example One being in the first state, the second state and the third state, respectively; the S8 thicknesses in Table 1 are 0.5102, 0.6224 and 1.3162, which represent the on-axis air gap 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 being in the first state, the second state and the third state, respectively; the S16 thicknesses in Table 1 are 1.4799, 1.3677 and 0.6738, which represent the on-axis air gap between the image side surface of the eighth lens E8 and the object side surface of the light transmission sheet E9 in the optical focusing lens being in the first state, the second state and the third state, respectively.

[0224] Table 2: Aspheric surface coefficient table of the optical focusing lens of Example One

[0225]

[0226]

[0227] Through simulation test, the on-axis chromatic aberration curves of the optical focusing lens in Example One being in the first state, the second state and the third state are shown in FIG. 2A , FIG. 3A and FIG. 4A , respectively, which represent the convergence focus deviation of light rays of different wavelengths after passing through the optical focusing lens; the astigmatism curves of the optical focusing lens in Example One being in the first state, the second state and the third state are shown in FIG. 2B , FIG. 3B and FIG. 4B , respectively, which represent the meridional image surface curvature and sagittal image surface curvature; the distortion curves of the optical focusing lens in Example One being in the first state, the second state and the third state are shown in FIG. 2C , FIG. 3C and FIG. 4C , respectively, which represent the distortion size values corresponding to different field angles. According to FIGS. 2A-4C , it can be known that the optical focusing lens of Example One can achieve good imaging quality at different object distances.

[0228] Example Two

[0229] As shown in FIGS. 5-8C , the optical focusing lens of Example Two is described. FIG. 5A structural diagram of the optical zoom lens of Example Two is shown, wherein the first lens E1 has positive refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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, Table 3 and Table 4 show the design data of the optical zoom lens of Example Two. Table 3 shows the basic optical parameters of the optical zoom lens of Example Two, wherein the units of the radius of curvature and the thickness are millimeters; Table 4 shows the high-order term coefficient table of each aspheric surface S1 to S16 of the optical zoom lens of Example Two.

[0231] Table 3: Basic optical parameter table of the optical zoom lens of Example Two

[0232]

[0233]

[0234] It should be noted that the OBJ thickness in Table 3 is infinite, 1000 and 150, which respectively represent that the optical zoom lens of Example Two is in the first state, the second state and the third state; the S8 thickness in Table 3 is 0.5133, 0.6257 and 1.3196, which respectively represent the axial air gap between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 in the optical zoom lens in the first state, the second state and the third state; the S16 thickness in Table 3 is 1.4883, 1.3759 and 0.6820, which respectively represent the axial air gap between the image side surface of the eighth lens E8 and the object side surface of the light transmission sheet E9 in the optical zoom lens in the first state, the second state and the third state.

[0235] Table 4: Aspheric surface coefficient table of the optical zoom lens of Example Two

[0236] Face No. 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 No. 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 zoom lens in the first state, the second state and the third state in Example Two are shown in FIG. 6A , FIG. 7A and FIG. 8A respectively, which represent the convergence focus deviation of light rays of different wavelengths after passing through the optical zoom lens; the astigmatism curves of the optical zoom lens in the first state, the second state and the third state in Example Two are shown in FIG. 6B , FIG. 7B and FIG. 8B respectively, which represent the meridional image surface curvature and sagittal image surface curvature; the distortion curves of the optical zoom lens in the first state, the second state and the third state in Example Two are shown in FIG. 6C , FIG. 7C and FIG. 8C respectively, which represent the distortion values corresponding to different field angles. According to FIGS. 6A-8C , the optical zoom lens of Example Two can achieve good imaging quality at different object distances.

[0238] Example Three

[0239] As shown in FIGS. 9-12C , the optical zoom lens of Example Three is described. FIG. 9 The structural schematic diagram of the optical zoom lens of Example Three is shown, in which the first lens E1 has positive refractive 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 refractive 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 refractive 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 refractive 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 refractive 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 refractive 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 refractive 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 refractive 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, Table 5 and Table 6 show the design data of the optical zoom lens of Example Three. Table 5 shows the basic optical parameters of the optical zoom lens of Example Three, in which the units of the curvature radius and the thickness are millimeters; Table 6 shows the high-order coefficient table of each aspherical surface S1 to S16 of the optical zoom lens of Example Three.

[0241] Table 5: Basic optical parameter table of the optical zoom lens of Example Three

[0242]

[0243] It is to be noted that the OBJ thickness in Table 5 is infinite, 1000 and 150, which represent the optical zoom lens in Example Three in the first state, the second state and the third state, respectively; the S8 thickness in Table 5 is 0.5140, 0.6264 and 1.3214, which represent the on-axis air gap between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 in the optical zoom lens in the first state, the second state and the third state, respectively; the S16 thickness in Table 5 is 1.4624, 1.3501 and 0.6550, which represent the on-axis air gap between the image side surface of the eighth lens E8 and the object side surface of the light transmission sheet E9 in the optical zoom lens in the first state, the second state and the third state, respectively.

[0244] Table 6: Aspheric surface coefficient table of the optical zoom lens of Example Three

[0245]

[0246]

[0247] Through simulation test, the on-axis chromatic aberration curves of the optical zoom lens in Example Three in the first state, the second state and the third state are shown in FIG. 10A , FIG. 11A and FIG. 12A , respectively, which represent the convergence focus deviation of light rays of different wavelengths after passing through the optical zoom lens; the astigmatism curves of the optical zoom lens in Example Three in the first state, the second state and the third state are shown in FIG. 10B , FIG. 11B and FIG. 12B , respectively, which represent the meridional image surface curvature and sagittal image surface curvature; the distortion curves of the optical zoom lens in Example Three in the first state, the second state and the third state are shown in FIG. 10C , FIG. 11C and FIG. 12C , respectively, which represent the distortion values corresponding to different field angles. According to FIGS. 10A-12C , it can be known that the optical zoom lens of Example Three can achieve good imaging quality at different object distances.

[0248] Example Four

[0249] As shown in FIGS. 13-16C , the optical zoom lens of Example Four is described. FIG. 13A structural diagram of the optical zoom lens of Example Four is shown, wherein the first lens E1 has positive refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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 refractive power, the object side surface and the image side surface of the eighth lens E8 are concave and concave respectively.

[0250] According to the above relational expression, Table 7 and Table 8 show the design data of the optical zoom lens of Example Four. Table 7 shows the basic optical parameters of the optical zoom lens of Example Four, wherein the units of the radius of curvature and the thickness are millimeters; Table 8 shows the high-order term coefficient table of each aspherical surface S1 to S16 of the optical zoom lens of Example Four.

[0251] Table 7: Basic optical parameter table of the optical zoom lens of Example Four

[0252]

[0253] It should be noted that the OBJ thickness in Table 7 is infinite, 1000 and 150, which respectively represent that the optical zoom lens of Example Four is in the first state, the second state and the third state; the S8 thickness in Table 7 is 0.0498, 0.0872 and 0.2985, which respectively represent the axial air gap between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 in the optical zoom lens in the first state, the second state and the third state; the S16 thickness in Table 7 is 0.3930, 0.3542 and 0.1462, which respectively represent the axial air gap between the image side surface of the eighth lens E8 and the object side surface of the light transmission sheet E9 in the optical zoom lens in the first state, the second state and the third state.

[0254] Table 8: Aspherical surface coefficient table of the optical zoom lens of Example Four

[0255]

[0256]

[0257] After simulation test: the axial chromatic aberration curves of the optical zoom lens in the first state, the second state and the third state in Example Four are shown in FIG. 14A , FIG. 15A and FIG. 16A respectively, which represent the convergence focus deviation of light rays of different wavelengths after passing through the optical zoom lens; the astigmatism curves of the optical zoom lens in the first state, the second state and the third state in Example Four are shown in FIG. 14B , FIG. 15B and FIG. 16B respectively, which represent the meridional image surface curvature and sagittal image surface curvature; the distortion curves of the optical zoom lens in the first state, the second state and the third state in Example Four are shown in FIG. 14C , FIG. 15C and FIG. 16C respectively, which represent the distortion values corresponding to different field angles. According to FIGS. 14A-16C , the optical zoom lens of Example Four can achieve good imaging quality at different object distances.

[0258] Example Five

[0259] As shown in FIGS. 17-20C , the optical zoom lens of Example Five is described. FIG. 17 The structural schematic diagram of the optical zoom lens of Example Five is shown, wherein the first lens E1 has positive refractive 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 refractive 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 refractive 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 refractive 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 refractive 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 refractive 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 refractive 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 refractive 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, Table 9 and Table 10 show the design data of the optical zoom lens of Example Five. Table 9 shows the basic optical parameters of the optical zoom lens of Example Five, wherein the units of the curvature radius and the thickness are millimeters; Table 10 shows the high-order coefficient table of each aspheric surface S1 to S16 of the optical zoom lens of Example Five.

[0261] Table 9: Basic optical parameter table of the optical zoom lens of Example Five

[0262]

[0263]

[0264] It is to be noted that the OBJ thickness in Table 9 is infinite, 1000 and 150, which represent the optical zoom lens in Example Five in the first state, the second state and the third state, respectively; the S8 thickness in Table 9 is 0.0501, 0.0914 and 0.3400, which represent the on-axis air gap between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 in the optical zoom lens in the first state, the second state and the third state, respectively; the S16 thickness in Table 9 is 0.4250, 0.3837 and 0.1351, which represent the on-axis air gap between the image side surface of the eighth lens E8 and the object side surface of the light transmission sheet E9 in the optical zoom lens in the first state, the second state and the third state, respectively.

[0265] Table 10: Aspheric surface coefficient table of the optical zoom lens of Example Five

[0266] Face No. 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 No. 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] Through simulation tests, the on-axis chromatic aberration curves of the optical zoom lens in Example Five in the first state, the second state and the third state are shown in FIG. 18A , FIG. 19A and FIG. 20A , respectively, which represent the degree of deflection of the converging focus of light rays of different wavelengths after passing through the optical zoom lens; the astigmatism curves of the optical zoom lens in Example Five in the first state, the second state and the third state are shown in FIG. 18B , FIG. 19B and FIG. 20B , respectively, which represent the degree of meridional image surface curvature and sagittal image surface curvature; the distortion curves of the optical zoom lens in Example Five in the first state, the second state and the third state are shown in FIG. 18C , FIG. 19C and FIG. 20C , respectively, which represent the distortion size values corresponding to different field angles. According to FIGS. 18A-20C , it can be known that the optical zoom lens of Example Five can achieve good imaging quality at different object distances.

[0268] Example Six

[0269] As shown in FIGS. 21-24C , the optical zoom lens of Example Six is described. FIG. 21A structure diagram of the optical zoom lens of Example Six is shown, wherein the first lens E1 has positive refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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 refractive power, 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, Table 11 and Table 12 show the design data of the optical zoom lens of Example Six. Table 11 shows the basic optical parameters of the optical zoom lens of Example Six, wherein the units of the radius of curvature and the thickness are millimeters; Table 12 shows the high-order term coefficient table of each aspherical surface S1 to S16 of the optical zoom lens of Example Six.

[0271] Table 11: Basic optical parameter table of the optical zoom lens of Example Six

[0272]

[0273] It should be noted that the OBJ thickness in Table 11 is infinite, 1000 and 150, which respectively represent that the optical zoom lens of Example Six is in the first state, the second state and the third state; the S8 thickness in Table 11 is 0.0502, 0.0935 and 0.3547, which respectively represent the axial air gap between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 in the optical zoom lens in the first state, the second state and the third state; the S16 thickness in Table 11 is 0.4456, 0.4023 and 0.1411, which respectively represent the axial air gap between the image side surface of the eighth lens E8 and the object side surface of the light transmission sheet E9 in the optical zoom lens in the first state, the second state and the third state.

[0274] Table 12: Aspherical surface coefficient table of the optical zoom lens of Example Six

[0275]

[0276]

[0277] After simulation test: the axial chromatic aberration curves of the optical zoom lens in the first state, the second state and the third state in Example Six are shown in FIG. 22A , FIG. 23A and FIG. 24A respectively, which represent the convergence focus deviation of light rays of different wavelengths after passing through the optical zoom lens; the astigmatism curves of the optical zoom lens in the first state, the second state and the third state in Example Six are shown in FIG. 22B , FIG. 23B and FIG. 24B respectively, which represent the meridional image surface curvature and sagittal image surface curvature; the distortion curves of the optical zoom lens in the first state, the second state and the third state in Example Six are shown in FIG. 22C , FIG. 23C and FIG. 24C respectively, which represent the distortion values corresponding to different field angles. According to FIGS. 22A-24C , the optical zoom lens of Example Six can achieve good imaging quality at different object distances.

[0278] Example Seven

[0279] As shown in FIGS. 25-28C , the optical zoom lens of Example Seven is described. FIG. 25 The structural schematic diagram of the optical zoom lens of Example Seven is shown, in which the first lens E1 has positive refractive 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 refractive 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 refractive 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 refractive 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 refractive 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 refractive 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 refractive 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 refractive 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 zoom lens of Example Seven. Table 13 shows the basic optical parameters of the optical zoom lens of Example Seven, in which the units of the curvature radius and the thickness are millimeters; Table 14 shows the high-order coefficient table of each aspherical surface S1 to S16 of the optical zoom lens of Example Seven.

[0281] Table 13: Basic optical parameter table of the optical zoom lens of Example Seven

[0282]

[0283]

[0284] It is to be noted that the OBJ thicknesses of 0, 1000 and 150 in Table 13 represent the optical zoom lens in Example Seven being 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 on-axis air gap between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E5 in the optical zoom lens being in the first state, the second state and the third state, respectively; and the S16 thicknesses of 0.4303, 0.3883 and 0.1349 in Table 13 represent the on-axis air gap between the image side surface of the eighth lens E8 and the object side surface of the light transmission sheet E9 in the optical zoom lens being in the first state, the second state and the third state, respectively.

[0285] Table 14: Aspheric surface coefficient table of the optical zoom lens of Example Seven

[0286]

[0287]

[0288] Through simulation tests, the on-axis chromatic aberration curves of the optical zoom lens in Example Seven being in the first state, the second state and the third state are shown in FIGS. 13A, 13B and 13C, respectively, which represent the degree of deflection of the converging focus points of light rays of different wavelengths after passing through the optical zoom lens; the astigmatism curves of the optical zoom lens in Example Seven being in the first state, the second state and the third state are shown in FIGS. 14A, 14B and 14C, respectively, which represent the degree of meridional image surface curvature and sagittal image surface curvature; and the distortion curves of the optical zoom lens in Example Seven being in the first state, the second state and the third state are shown in FIGS. 15A, 15B and 15C, respectively, which represent the distortion values corresponding to different field angles. According to the simulation results, the optical zoom lens of Example Seven can achieve good imaging quality at different object distances. FIG. 26A FIG. 27A FIG. 28A FIG. 26B FIG. 27B FIG. 28B FIG. 26C FIG. 27C FIG. 28C FIGS. 26A-28C

[0289] In summary, the system optical parameters of the optical zoom lenses in Examples One to Seven are shown in Table 15.

[0290] Table 15: System optical parameter table of the optical zoom 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 FNOi 1.566 1.566 1.566 1.567 1.567 1.567 1.567 ​​​​​​​​​​

[0292] Note 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 zoom lens when the object distance is infinity; △f represents the effective focal length difference of the optical zoom lens when the object distance is infinity and infinity close, respectively; F1 represents the effective focal length of the fixed lens group G1; F2 represents the effective focal length of the zoom lens group G2; ImgH represents the imaging height of the optical zoom lens; and FNOi represents the aperture coefficient of the optical zoom lens.

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

[0294] Table 16: Relationship table satisfied by the optical zoom lens

[0295]

[0296]

[0297] The technical features of the above embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not result in contradictions, they shall be considered within the scope of the present disclosure.

[0298] The above embodiments only express several implementation manners of the present disclosure, and the description is relatively specific and detailed, however, it shall not be understood as a limitation on the scope of the patent right of the present disclosure. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present disclosure, and these shall be within the protection scope of the present disclosure. Therefore, the protection scope of the patent right of the present disclosure shall be subject to the appended claims.

Claims

1. An optical zoom lens comprising a first lens barrel and a second lens barrel arranged in order from an object side to an image side along an optical axis, characterized in that: the first lens barrel has a fixed lens group with positive refractive power, and comprises in order from the object side to the image side along the optical axis a first lens with positive refractive power, a second lens with refractive power, a third lens with negative refractive power, and a fourth lens with positive refractive power; 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, and the object side surface and the image side surface of the fourth lens are both convex; and the second lens barrel has a zoom lens group with negative refractive power, wherein the second lens barrel is movably arranged relative to the first lens barrel along the optical axis, and the zoom lens group comprises in order from the object side to the image side along the optical axis a fifth lens with negative refractive power, a sixth lens with positive refractive power, a seventh lens with positive refractive power, and an eighth lens with negative refractive power; the object side surface and the image side surface of the fifth lens are concave and convex respectively, the object side surface and the image side surface of the sixth lens are convex and concave respectively, the image side surface of the seventh lens is convex, and the object side surface and the image side surface of the eighth lens are both concave; wherein the number of lenses with refractive power in the optical zoom lens is eight; the optical zoom 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 zoom lens at object distances of infinity and infinity close respectively; Tw is the axial air interval of the fixed lens group and the zoom lens group at an object distance of infinity close; fi is the effective focal length of the optical zoom lens at an object distance of infinity; and F2 is the effective focal length of the zoom lens group.

2. The optical focusing lens of claim 1, wherein, the fixed lens group and the zoom lens group satisfy the relationship: -1.25 < F1 / F2 < -0.95; wherein F1 is the effective focal length of the fixed lens group; and F2 is the effective focal length of the zoom lens group.

3. The optical focusing lens of claim 1, wherein, the zoom lens group satisfies the relationship: -1.30 < F2 / TD2 < -0.90; wherein F2 is the effective focal length of the zoom lens group; and 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 of claim 1, wherein, the zoom lens group satisfies the relationship: 0.90 < f8 / F2 ≤ 1.45; wherein f8 is the effective focal length of the eighth lens; and F2 is the effective focal length of the zoom lens group.

5. The optical focusing lens of claim 1, wherein, the zoom lens group satisfies the relationship: 1.60 < f5 / f8 < 2.35; wherein f5 is the effective focal length of the fifth lens; and f8 is the effective focal length of the eighth lens.

6. The optical focusing lens of claim 1, wherein, the zoom lens group satisfies the relationship: -6.20 < f7 / F2 < -1.95; wherein f7 is the effective focal length of the seventh lens; and F2 is the effective focal length of the zoom lens group.

7. The optical focusing lens of claim 1, wherein, the fixed lens group satisfies the relationship: 2.0 ≤ F1 / CT4 < 2.75; wherein F1 is the effective focal length of the fixed lens group; and CT4 is the center thickness of the fourth lens.

8. The optical focusing lens of claim 1, wherein, the fixed lens group satisfies the relationship: 2.10 < f1 / F1 < 4.20; Wherein, 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 of claim 1, wherein, The fixed lens group satisfies the relationship: -3.85 < f3 / F1 < -2.

25. Wherein, 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 of claim 1, wherein, The fixed lens 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 of claim 1, wherein, The fixed lens group satisfies the relationship: 2.85 < TD1 / (T23+T34) < 4.45; Wherein, TD1 is the axial distance between the object side of the first lens and the image side of the fourth lens; T23 is the axial air gap between the second lens and the third lens; T34 is the axial air gap between the third lens and the fourth lens.

12. The optical focusing lens of claim 1, wherein, The optical focusing lens satisfies the relationship: 1.80 < |△f| / |△T| ≤ 2.55; Wherein, △f is the effective focal length difference of the optical focusing lens when the object distance is infinity and infinity; △T is the axial air gap difference of the fixed lens group and the focusing lens group when the object distance is infinity and infinity.

13. The optical focusing lens of claim 1, wherein, 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; △f is the effective focal length difference of the optical focusing lens when the object distance is infinity and infinity.

14. The optical focusing lens of claim 13, wherein, 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 of claim 13, wherein, The focusing lens group satisfies the relationship: 0.80 < T56 / (CT5+CT6) < 0.95; Wherein, T56 is the axial air gap between the fifth lens and the sixth lens; CT5 is the center thickness of the fifth lens; CT6 is the center thickness of the sixth lens.

16. The optical focusing lens of claim 1, wherein, The optical focusing lens satisfies the relationship: 6.90 < TD1 / |△f| < 8.90; Wherein, TD1 is the axial distance between the object side of the first lens and the image side of the fourth lens; △f is the effective focal length difference of the optical focusing lens when the object distance is infinity and infinity.

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

Images