Optical lens system

Abstract

The utility model discloses an optical lens system. The optical lens system comprises a lens barrel, a five-piece lens group and a separator group, wherein the five-piece lens group and the separator group are arranged in the lens barrel; the five-piece type lens group comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power and a fifth lens with negative focal power which are sequentially arranged from the object side to the image side along the optical axis; the separator group comprises a third separator which is arranged on the image side surface of the third lens and is in contact with the image side surface of the third lens, and a fourth separator which is arranged on the image side surface of the fourth lens and is in contact with the image side surface of the fourth lens; wherein the air interval T34 between the third lens and the fourth lens on the optical axis and the air interval T45 between the fourth lens and the fifth lens on the optical axis meet the following conditions: 1.2 lt; t34 / T45lt, T34 / T45lt; 2.5); the effective focal length f4 of the fourth lens and the outer diameter D4m of the image side surface of the fourth isolation piece meet the following formula: 2lt; d4m / f4lt; 3; the effective focal length f3 of the third lens and the maximum thickness CP3 of the third separator meet the following conditions: 18lt; f3 / CP3lt; 25).

Description

Technical Field

[0001] This application relates to the field of optical devices, and particularly to a five-piece optical lens system. Background Art

[0002] In recent years, with the ever-changing consumer demands, the requirements for optical lens systems have gradually become more complex and diverse. In different application scenarios, the performance of optical lens systems varies.

[0003] Currently, the five-piece optical lens system has become the mainstream. The air gap between the third lens and the fourth lens in this optical lens system is relatively large, which makes the third lens and the fourth lens more sensitive, and deformation problems are likely to occur during the assembly process of the third lens and the fourth lens, thus affecting the performance of the optical lens system. Summary of the Utility Model

[0004] This application provides an optical lens system that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0005] One aspect of this application provides such an optical lens system, which includes a lens barrel, a five-piece lens group, and an isolator group disposed within the lens barrel; the five-piece lens group includes a first lens with a positive focal power, a second lens with a negative focal power, a third lens with a positive focal power, a fourth lens with a positive focal power, and a fifth lens with a negative focal power arranged in sequence from the object side to the image side along the optical axis; the isolator group includes a third isolator disposed on and in contact with the image side surface of the third lens and a fourth isolator disposed on and in contact with the image side surface of the fourth lens; wherein, the air gap T34 between the third lens and the fourth lens on the optical axis and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 1.2 < T34 / T45 < 2.5; the effective focal length f4 of the fourth lens and the outer diameter D4m of the image side surface of the fourth isolator satisfy: 2 < D4m / f4 < 3; the effective focal length f3 of the third lens and the maximum thickness CP3 of the third isolator satisfy: 18 < f3 / CP3 < 25.

[0006] According to an exemplary embodiment of this application, the effective focal length f5 of the fifth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 1 < R9 / f5 < 2; the interval EP34 between the third isolator and the fourth isolator along the optical axis and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 0.5 < EP34 / T45 < 2.7; the effective focal length f3 of the third lens and the inner diameter d4m of the image side surface of the fourth isolator satisfy: 1 < f3 / d4m < 2.

[0007] According to an exemplary embodiment of the present application, the central thickness CT4 of the fourth lens on the optical axis, the inner diameter d4m of the image side of the fourth spacer, and the outer diameter D4m of the image side of the fourth spacer satisfy: 1 < (D4m - d4m) / CT4 < 5.

[0008] According to an exemplary embodiment of the present application, the radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the image side of the fourth lens satisfy: 7 < R7 / R8 < 8.5; the radius of curvature R7 of the object side of the fourth lens, the outer diameter D3m of the image side of the third spacer, and the inner diameter d4s of the object side of the fourth spacer satisfy: -7 < R7 / (D3m - d4s) < -3.5.

[0009] According to an exemplary embodiment of the present application, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, and the inner diameter d3s of the object side of the third spacer satisfy: -4 < d3s / (f2 + f3) < -1.

[0010] According to an exemplary embodiment of the present application, the spacer group further includes a second spacer disposed on and in contact with the image side of the second lens. Wherein, the central thickness CT2 of the second lens on the optical axis and the interval EP23 between the second spacer and the third spacer along the optical axis satisfy: 1 < EP23 / CT2 < 2.9.

[0011] According to an exemplary embodiment of the present application, the spacer group further includes a second spacer disposed on and in contact with the image side of the second lens. Wherein, the radius of curvature R3 of the object side of the second lens and the inner diameter d2s of the object side of the second spacer satisfy: 1 < R3 / d2s < 2; the radius of curvature R4 of the image side of the second lens and the inner diameter d2m of the image side of the second spacer satisfy: 0.5 < R4 / d2m < 1.5.

[0012] According to an exemplary embodiment of the present application, the combined focal length f34 of the third lens and the fourth lens, the air interval T34 between the third lens and the fourth lens on the optical axis, and the interval EP34 between the third spacer and the fourth spacer along the optical axis satisfy: 1 < f34 / (EP34 + T34) < 3.

[0013] According to an exemplary embodiment of the present application, the spacer group further includes a second spacer disposed on and in contact with the image side of the second lens. Wherein, the radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, the inner diameter d2m of the image side of the second spacer, and the inner diameter d3m of the image side of the third spacer satisfy: -1.5 < d2m / R5 + d3m / R6 < -0.2.

[0014] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on and in contact with the image side surface of the first lens. Wherein, the effective focal length f1 of the first lens and the inner diameter d0s of the object side end surface of the lens barrel satisfy: 0.5 < f1 / d0s < 2; the effective focal length f1 of the first lens and the interval EP01 between the object side end surface of the lens barrel and the first spacer along the optical axis satisfy: 5 < f1 / EP01 < 7.

[0015] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on and in contact with the image side surface of the first lens. Wherein, the central thickness CT1 of the first lens on the optical axis, the air interval T12 between the first lens and the second lens on the optical axis, and the maximum thickness CP1 of the first spacer satisfy: 3.5 < (CP1 + CT1) / T12 < 4.5.

[0016] According to an exemplary embodiment of the present application, the spacer group further includes a third auxiliary spacer disposed on and in contact with the image side surface of the third spacer. Wherein, the air interval T34 between the third lens and the fourth lens on the optical axis, the maximum thickness CP3 of the third spacer, the maximum thickness CP3b of the third auxiliary spacer, and the maximum thickness CP4 of the fourth spacer satisfy: 0.5 < T34 / (CP3 + CP3b + CP4) < 2.

[0017] According to an exemplary embodiment of the present application, the spacer group further includes a third auxiliary spacer disposed on and in contact with the image side surface of the third spacer. Wherein, the effective focal length f3 of the third lens, the inner diameter d3bs of the object side surface of the third auxiliary spacer, and the outer diameter D3bm of the image side surface of the third auxiliary spacer satisfy: 1.5 < f3 / (D3bm - d3bs) < 2.5.

[0018] According to an exemplary embodiment of the present application, the outer diameter D4m of the image side surface of the fourth spacer and the axial distance TD from the object side surface of the first lens to the image side surface of the fifth lens satisfy: 1.1 < D4m / TD < 2.3.

[0019] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on and in contact with the image side surface of the first lens and a second spacer disposed on and in contact with the image side surface of the second lens. Wherein, the maximum value ATmax of the air intervals between any two adjacent lenses among the first lens to the fifth lens and the maximum value CPmax of the maximum thicknesses of any one of the first spacer to the fourth spacer satisfy: 1.1 < ATmax / CPmax < 2.4.

[0020] According to an exemplary embodiment of the present application, the spacer group further includes a fourth auxiliary spacer disposed on and in contact with the image side surface of the fourth spacer, wherein the combined focal length f45 of the fourth lens and the fifth lens, the inner diameter d4bm of the image side surface of the fourth auxiliary spacer, and the outer diameter D4bm of the image side surface of the fourth auxiliary spacer satisfy: -5 < f45 / (D4bm - d4bm) < -3.5.

[0021] The optical lens system provided by the present application uses five lenses. When the optical lens system satisfies "1.2 < T34 / T45 < 2.5", the air gap between the third lens and the fourth lens on the optical axis is relatively large, which will cause the third lens and the fourth lens to be more sensitive, and the third lens and the fourth lens are prone to deformation problems during the assembly process, thereby affecting the performance of the optical lens system. Therefore, by controlling the ratio of the outer diameter of the image side surface of the fourth spacer to the effective focal length of the fourth lens and the ratio of the effective focal length of the third lens to the maximum thickness of the third spacer, it is possible to ensure that the third lens and the fourth lens have good relative strength and anti-bending ability, thereby reducing the risk of deformation of the third lens and the fourth lens during the assembly process and improving the performance of the optical lens system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings, in which:

[0023] Figure 1 shows a schematic structural diagram of the optical lens system according to the present application;

[0024] Figure 2 shows a schematic structural diagram of the optical lens system according to Embodiment 1 of the present application;

[0025] Figure 3 shows a schematic structural diagram of the optical lens system according to Embodiment 2 of the present application;

[0026] Figure 4 shows a schematic structural diagram of the optical lens system according to Embodiment 3 of the present application;

[0027] FIG. 5A to FIG. 5D respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical lens system according to Embodiment 1, 2, or 3 of the present application;

[0028] Figure 6 shows a schematic structural diagram of the optical lens system according to Embodiment 4 of the present application;

[0029] Figure 7 shows a schematic structural diagram of the optical lens system according to Embodiment 5 of the present application;

[0030] Figure 8 A schematic structural diagram of an optical lens system according to Embodiment 6 of the present application is shown;

[0031] 9A to 9D The axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical lens system according to Embodiment 4, 5 or 6 of the present application are respectively shown;

[0032] Fig.10 A schematic structural diagram of an optical lens system according to Embodiment 7 of the present application is shown;

[0033] Fig.11 A schematic structural diagram of an optical lens system according to Example 8 of the present application is shown;

[0034] Fig.12 A schematic structural diagram of an optical lens system according to Example 9 of the present application is shown;

[0035] FIG. 13A to FIG. 13D The axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical lens system according to Embodiment 7, 8 or 9 of the present application are respectively shown;

[0036] Fig.14A The figure shows the Modulation Transfer Function (MTF) curve limited by the diffraction limit when the optical lens system satisfies T34 / T45=0.01, D4m / f4=-11, f3 / CP3=-5;

[0037] Fig. 14B The modulation transfer function curve limited by the diffraction limit when the optical lens system satisfies T34 / T45=15, D4m / f4=12, f3 / CP3=40 is shown;

[0038] Fig. 14C shows a modulation transfer function curve limited by the diffraction limit when the optical lens system satisfies T34 / T45=1.8, D4m / f4=2.4, f3 / CP3=21.1; and

[0039] Fig.14D The modulation transfer function curve is shown when the optical lens system satisfies the diffraction limit of T34 / T45=1.97, D4m / f4=2.45, and f3 / CP3=23.4. DETAILED DESCRIPTION

[0040] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0041] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0042] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0043] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0044] It should also be understood that the terms "including" and / or "having", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when describing the embodiments of the present application, the term "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0045] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] Figure 1Schematic diagram of the structure arrangement and some parameters of the optical lens system according to an exemplary embodiment of the present application. Figure 1 , d2s represents the inner diameter of the object side of the second isolator, d2m represents the inner diameter of the image side of the second isolator, d3s represents the inner diameter of the object side of the third isolator, d3m represents the inner diameter of the image side of the third isolator, D3m represents the outer diameter of the image side of the third isolator, d3bs represents the inner diameter of the object side of the third auxiliary isolator, D3bm represents the outer diameter of the image side of the third auxiliary isolator, d4s represents the inner diameter of the object side of the fourth isolator, d4m represents the inner diameter of the image side of the fourth isolator, D4m represents the outer diameter of the image side of the fourth isolator, d4bm represents The inner diameter of the image side surface of the fourth auxiliary isolator, D4bm represents the outer diameter of the image side surface of the fourth auxiliary isolator, d0s represents the inner diameter of the object side end surface of the lens barrel, CP1 represents the maximum thickness of the first isolator, CP3 represents the maximum thickness of the third isolator, CP3b represents the maximum thickness of the third auxiliary isolator, CP4 represents the maximum thickness of the fourth isolator, EP01 represents the interval between the object side end surface of the lens barrel and the first isolator along the optical axis, EP23 represents the interval between the second isolator and the third isolator along the optical axis, and EP34 represents the interval between the third isolator and the fourth isolator along the optical axis.

[0048] refer to Figures 2 to 4 , Figures 6 to 8 as well as Figures 10 to 12 In a first aspect of the present application, an optical lens system is provided. The optical lens system may include a five-piece lens group. The five-piece lens group may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence from the object side to the image side along the optical axis. Among the first lens to the fifth lens, any two adjacent lenses may have an air gap between them.

[0049] In an exemplary embodiment, the first lens may have positive optical power, with a convex object-side surface and a concave image-side surface.

[0050] In an exemplary embodiment, the second lens may have negative optical power, with a convex object-side surface and a concave image-side surface.

[0051] In an exemplary embodiment, the third lens may have positive refractive power, with an object-side surface being convex and an image-side surface being convex.

[0052] In an exemplary embodiment, the fourth lens may have positive refractive power, with its object-side surface being concave and its image-side surface being convex.

[0053] In example embodiments, the fifth lens may have negative power, with its object-side surface being concave and its image-side surface being concave.

[0054] In an exemplary embodiment, the optical lens system may further include a set of spacers, which may include one or more of a first spacer, a second spacer, a third spacer, a fourth spacer, a third auxiliary spacer, and a fourth auxiliary spacer. The first spacer may be disposed on the image side surface of the first lens and at least partially contact the image side surface of the first lens. The second spacer may be disposed on the image side surface of the second lens and at least partially contact the image side surface of the second lens. The third spacer may be disposed on the image side surface of the third lens and at least partially contact the image side surface of the third lens. The fourth spacer may be disposed on the image side surface of the fourth lens and at least partially contact the image side surface of the fourth lens. The third auxiliary spacer may be disposed on the image side surface of the third spacer and at least partially contact the image side surface of the third spacer. The fourth auxiliary spacer may be disposed on the image side surface of the fourth spacer and at least partially contact the image side surface of the fourth spacer. Reasonable use of the spacers can effectively avoid the risk of stray light, reduce the interference to the image quality, and thus improve the imaging quality of the optical lens system.

[0055] In an exemplary embodiment, the optical lens system may further include a lens barrel, and the five-piece lens group and the set of spacers are disposed inside the lens barrel. The lens barrel may include an object-side end face, an image-side end face, an outer ring surface, and an inner ring surface. Among them, the end face of the lens barrel closest to the object side is the object-side end face of the lens barrel, and the end face of the lens barrel closest to the image side is the image-side end face of the lens barrel; in the direction perpendicular to the optical axis, the outermost surface of the lens barrel away from the optical axis is the outer ring surface, and the innermost surface of the lens barrel closest to the optical axis is the inner ring surface.

[0056] In an exemplary embodiment, the air gap T34 between the third lens and the fourth lens on the optical axis and the air gap T45 between the fourth lens and the fifth lens on the optical axis may satisfy: 1.2 < T34 / T45 < 2.5; the effective focal length f4 of the fourth lens and the outer diameter D4m of the image side surface of the fourth spacer may satisfy: 2 < D4m / f4 < 3; the effective focal length f3 of the third lens and the maximum thickness CP3 of the third spacer may satisfy: 18 < f3 / CP3 < 25. When the optical lens system satisfies "1.2 < T34 / T45 < 2.5", the air gap between the third lens and the fourth lens on the optical axis is relatively large, which will cause the third lens and the fourth lens to be more sensitive, and the third lens and the fourth lens are prone to deformation problems during the assembly process, thus affecting the performance of the optical lens system. Therefore, by controlling the ratio of the outer diameter of the image side surface of the fourth spacer to the effective focal length of the fourth lens and the ratio of the effective focal length of the third lens to the maximum thickness of the third spacer, it is possible to ensure that the third lens and the fourth lens have good relative strength and anti-bending ability, thereby reducing the risk of deformation of the third lens and the fourth lens during the assembly process and improving the performance of the optical lens system.

[0057] Fig.14AThe modulation transfer function curve limited by the diffraction limit when the optical lens system satisfies T34 / T45 = 0.01, D4m / f4 = -11, and f3 / CP3 = -5; Fig. 14B The modulation transfer function curve limited by the diffraction limit when the optical lens system satisfies T34 / T45 = 15, D4m / f4 = 12, and f3 / CP3 = 40; Fig. 14C The modulation transfer function curve limited by the diffraction limit when the optical lens system satisfies T34 / T45 = 1.8, D4m / f4 = 2.4, and f3 / CP3 = 21.1; Fig.14D The modulation transfer function curve limited by the diffraction limit when the optical lens system satisfies T34 / T45 = 1.97, D4m / f4 = 2.45, and f3 / CP3 = 23.4.

[0058] From Fig.14A and Fig. 14B it can be seen that when the optical lens system does not satisfy 1.2 < T34 / T45 < 2.5, 2 < D4m / f4 < 3, and 18 < f3 / CP3 < 25, the peak value of the MTF of the optical lens system is at a defocus position in the range of -0.02 mm to 0.03 mm. From Fig. 14C and Fig.14D it can be seen that when the optical lens system satisfies 1.2 < T34 / T45 < 2.5, 2 < D4m / f4 < 3, and 18 < f3 / CP3 < 25, the peak value of the MTF of the optical lens system is at a defocus position in the range of -0.01 mm to 0.01 mm. It can be seen that by controlling the optical lens system to satisfy "1.2 < T34 / T45 < 2.5, 2 < D4m / f4 < 3, 18 < f3 / CP3 < 25", it helps to improve the performance of the optical lens system.

[0059] In an exemplary embodiment, the effective focal length f5 of the fifth lens and the radius of curvature R9 of the object side surface of the fifth lens may satisfy: 1 < R9 / f5 < 2; the interval EP34 of the third spacer and the fourth spacer along the optical axis and the air interval T45 of the fourth lens and the fifth lens on the optical axis may satisfy: 0.5 < EP34 / T45 < 2.7; the effective focal length f3 of the third lens and the inner diameter d4m of the image side surface of the fourth spacer may satisfy: 1 < f3 / d4m < 2. When the optical lens system satisfies "1 < R9 / f5 < 2", by controlling the ratio of the interval of the third spacer and the fourth spacer along the optical axis to the air interval of the fourth lens and the fifth lens on the optical axis and the ratio of the effective focal length of the third lens to the inner diameter of the image side surface of the fourth spacer, the relative positions of the third lens, the fourth lens, and the fifth lens on the optical axis and the inner diameter of the fourth spacer can be constrained, ensuring that light passes through the entire optical lens system in a predetermined direction, thereby reducing the risk of stray light in the optical lens system.

[0060] In an exemplary embodiment, the central thickness CT4 of the fourth lens on the optical axis, the inner diameter d4m of the image side of the fourth spacer, and the outer diameter D4m of the image side of the fourth spacer may satisfy: 1 < (D4m - d4m) / CT4 < 5. By controlling the ratio of the difference between the outer and inner diameters of the image side of the fourth spacer to the central thickness of the fourth lens on the optical axis, the sizes of the fourth spacer and the fourth lens can be constrained, facilitating the use of the fourth spacer to block non-effective light from entering the fifth lens and reducing the risk of stray light in the fifth lens.

[0061] In an exemplary embodiment, the radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the image side of the fourth lens may satisfy: 7 < R7 / R8 < 8.5; the radius of curvature R7 of the object side of the fourth lens, the outer diameter D3m of the image side of the third spacer, and the inner diameter d4s of the object side of the fourth spacer may satisfy: -7 < R7 / (D3m - d4s) < -3.5. When "7 < R7 / R8 < 8.5", by reasonably controlling the mutual relationship among the radius of curvature of the object side of the fourth lens, the outer diameter of the image side of the third spacer, and the inner diameter of the object side of the fourth spacer, the deflection direction and deflection angle of light in the fourth lens can be controlled, reducing the risk of stray light in the fourth lens.

[0062] In an exemplary embodiment, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, and the inner diameter d3s of the object side of the third spacer may satisfy: -4 < d3s / (f2 + f3) < -1. By controlling the ratio of the inner diameter of the object side of the third spacer to the sum of the effective focal lengths of the second lens and the third lens, the light can pass through the second lens and the third lens in a predetermined direction, thereby reducing the stray light generated by the second lens and the third lens.

[0063] In an exemplary embodiment, the central thickness CT2 of the second lens on the optical axis and the interval EP23 between the second spacer and the third spacer along the optical axis may satisfy: 1 < EP23 / CT2 < 2.9. By controlling the ratio of the interval between the second spacer and the third spacer along the optical axis to the central thickness of the second lens on the optical axis, the relative positions of the second lens and the third lens on the optical axis can be ensured, and the light emitted from the second lens can enter the third lens along a predetermined route, reducing the risk of stray light.

[0064] In an exemplary embodiment, the radius of curvature R3 of the object side surface of the second lens and the inner diameter d2s of the object side surface of the second spacer may satisfy: 1 < R3 / d2s < 2; the radius of curvature R4 of the image side surface of the second lens and the inner diameter d2m of the image side surface of the second spacer may satisfy: 0.5 < R4 / d2m < 1.5. By controlling the ratio of the radius of curvature of the object side surface of the second lens to the inner diameter of the object side surface of the second spacer and the ratio of the radius of curvature of the image side surface of the second lens to the inner diameter of the image side surface of the second spacer, the sizes of the second lens and the second spacer can be constrained, the processability and processing stability of the second lens and the second spacer can be improved, and thus the consistency of product quality can be ensured.

[0065] In an exemplary embodiment, the combined focal length f34 of the third lens and the fourth lens, the air gap T34 between the third lens and the fourth lens on the optical axis, and the interval EP34 between the third spacer and the fourth spacer along the optical axis may satisfy: 1 < f34 / (EP34 + T34) < 3. By reasonably controlling the mutual relationship among the combined focal length of the third lens and the fourth lens, the air gap between the third lens and the fourth lens on the optical axis, and the interval between the third spacer and the fourth spacer along the optical axis, the relative positions of the third lens and the fourth lens can be constrained, so as to ensure that the performance of the optical lens system meets the design requirements.

[0066] In an exemplary embodiment, the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, the inner diameter d2m of the image side surface of the second spacer, and the inner diameter d3m of the image side surface of the third spacer may satisfy: -1.5 < d2m / R5 + d3m / R6 < -0.2. By controlling the ratio of the inner diameter of the image side surface of the second spacer to the radius of curvature of the object side surface of the third lens and the ratio of the inner diameter of the image side surface of the third spacer to the radius of curvature of the image side surface of the third lens, the number of mechanisms (non-effective diameter parts) through which light rays bypass the second spacer and the third spacer and irradiate the fourth lens can be reduced, thereby reducing the resulting stray glare.

[0067] In an exemplary embodiment, the effective focal length f1 of the first lens and the inner diameter d0s of the object side end surface of the lens barrel may satisfy: 0.5 < f1 / d0s < 2; the effective focal length f1 of the first lens and the interval EP01 between the object side end surface of the lens barrel and the first spacer along the optical axis may satisfy: 5 < f1 / EP01 < 7. By controlling the ratio of the effective focal length of the first lens to the inner diameter of the object side end surface of the lens barrel and the ratio of the effective focal length of the first lens to the interval between the object side end surface of the lens barrel and the first spacer along the optical axis, the fluctuation of the light ray aperture passing through the first spacer can be ensured to be within a reasonable range, and the light flux can reach an optimal state, ensuring that the optical lens system meets the imaging requirements.

[0068] In an exemplary embodiment, the central thickness CT1 of the first lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the maximum thickness CP1 of the first spacer may satisfy: 3.5 < (CP1 + CT1) / T12 < 4.5. By controlling the ratio of the sum of the central thickness of the first lens and the maximum thickness of the first spacer to the air gap between the first lens and the second lens on the optical axis, the relative positions of the first lens and the second lens on the optical axis can be ensured, and the deflection direction and deflection angle of the light passing through the first lens and the second lens can be restricted, so that the performance of the optical lens system meets the requirements.

[0069] In an exemplary embodiment, the air gap T34 between the third lens and the fourth lens on the optical axis, the maximum thickness CP3 of the third spacer, the maximum thickness CP3b of the third auxiliary spacer, and the maximum thickness CP4 of the fourth spacer may satisfy: 0.5 < T34 / (CP3 + CP3b + CP4) < 2. By controlling the ratio of the air gap between the third lens and the fourth lens on the optical axis to the sum of the maximum thicknesses of the third spacer, the third auxiliary spacer, and the fourth spacer, the relative positions of the third lens and the fourth lens on the optical axis can be guaranteed, and the light can be made to enter the fifth lens along a predetermined path after passing through the third lens and the fourth lens, reducing the risk of stray light.

[0070] In an exemplary embodiment, the effective focal length f3 of the third lens, the inner diameter d3bs of the object side surface of the third auxiliary spacer, and the outer diameter D3bm of the image side surface of the third auxiliary spacer may satisfy: 1.5 < f3 / (D3bm - d3bs) < 2.5. By controlling the ratio of the effective focal length of the third lens to the difference between the outer diameter of the image side surface and the inner diameter of the object side surface of the third auxiliary spacer, the sizes of the third lens and the third auxiliary spacer can be restricted, ensuring the processability of the third lens and the third auxiliary spacer. At the same time, it can also ensure that the light can propagate along a predetermined path after passing through the third lens, reducing the risk of stray light.

[0071] In an exemplary embodiment, the outer diameter D4m of the image side surface of the fourth spacer and the on-axis distance TD from the object side surface of the first lens to the image side surface of the fifth lens may satisfy: 1.1 < D4m / TD < 2.3. By controlling the ratio of the outer diameter of the image side surface of the fourth spacer to the on-axis distance from the object side surface of the first lens to the image side surface of the fifth lens, the size of the fourth spacer can be restricted, ensuring that the light passes through each element along a predetermined path, and making the optical lens system meet the imaging requirements while ensuring the light passing amount.

[0072] In an exemplary embodiment, the maximum value ATmax of the air gap between any two adjacent lenses among the first lens to the fifth lens and the maximum value CPmax of the maximum thickness of any one of the first spacer to the fourth spacer may satisfy: 1.1 < ATmax / CPmax < 2.4. By controlling the ratio of the maximum air gap between adjacent lenses on the optical axis to the maximum thickness of any one spacer, the sizes of the lenses and spacers can be constrained, ensuring the processing feasibility of the lenses and spacers, thereby improving the processability and processing stability of the entire optical lens system.

[0073] In an exemplary embodiment, the combined focal length f45 of the fourth lens and the fifth lens, the inner diameter d4bm of the image side of the fourth auxiliary spacer, and the outer diameter D4bm of the image side of the fourth auxiliary spacer may satisfy: -5 < f45 / (D4bm - d4bm) < -3.5. By controlling the ratio of the combined focal length of the fourth lens and the fifth lens to the difference between the inner and outer diameters of the image side of the fourth auxiliary spacer, the relative positions of the fourth lens and the fifth lens on the optical axis and the size of the fourth auxiliary spacer can be constrained, ensuring that light enters the fifth lens from the fourth lens along a predetermined path, reducing the stray light risk of the optical lens system while improving the imaging ability and overall stability.

[0074] In an exemplary embodiment, the optical lens system may further include a diaphragm disposed between the object side and the first lens.

[0075] The optical lens system according to the above embodiment of the present application may employ five lenses and at least one spacer. By reasonably allocating the parameters of each lens and each spacer, miniaturization of the optical lens system can be achieved, the stray light risk of the optical lens system can be reduced, and the processability, assembly stability, and imaging quality of the optical lens system can be improved.

[0076] In an embodiment of the present application, at least one of the surfaces of each of the first lens to the fifth lens is an aspherical surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality. Optionally, both the object side and the image side of each of the first lens to the fifth lens are aspherical surfaces.

[0077] The second aspect of the present application provides an optical lens system, which includes a lens barrel, a five-piece lens group and an isolator group disposed within the lens barrel. The five-piece lens group includes a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a positive optical power, and a fifth lens with a negative optical power, which are arranged in sequence from the object side to the image side along the optical axis. The isolator group includes a third isolator disposed on and in contact with the image side surface of the third lens and a fourth isolator disposed on and in contact with the image side surface of the fourth lens.

[0078] Wherein, the effective focal length f5 of the fifth lens and the curvature radius R9 of the object side surface of the fifth lens can satisfy: 1 < R9 / f5 < 2; the interval EP34 of the third isolator and the fourth isolator along the optical axis and the air interval T45 of the fourth lens and the fifth lens on the optical axis can satisfy: 0.5 < EP34 / T45 < 2.7; the effective focal length f3 of the third lens and the inner diameter d4m of the image side surface of the fourth isolator can satisfy: 1 < f3 / d4m < 2. The optical lens system provided by the present application uses five lenses. When the optical lens system satisfies "1 < R9 / f5 < 2", by controlling the ratio of the interval of the third isolator and the fourth isolator along the optical axis to the air interval of the fourth lens and the fifth lens on the optical axis and the ratio of the effective focal length of the third lens to the inner diameter of the image side surface of the fourth isolator, the relative positions of the third lens, the fourth lens and the fifth lens on the optical axis and the inner diameter of the fourth isolator can be constrained, ensuring that light passes through the entire optical lens system in a predetermined direction, thereby reducing the risk of stray light in the optical lens system.

[0079] Those skilled in the art should understand that without departing from the technical solutions claimed in the present application, the number of lenses and isolators constituting the optical lens system can be changed to obtain the various results and advantages described in this specification.

[0080] The following further describes specific embodiments of the optical lens system applicable to the above embodiments with reference to the accompanying drawings.

[0081] Example 1

[0082] The following refers to Figure 2 Describe the optical lens system according to Embodiment 1 of the present application.

[0083] As Figure 2As shown, the optical lens system includes a lens barrel and a five-piece lens group and a spacer group placed in the lens barrel. The five-piece lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 in sequence from the object side to the image side along the optical axis. The aperture STO can be arranged between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The spacer group also includes a third auxiliary spacer P3b and a fourth auxiliary spacer P4b. The spacer can block excess light in the imaging process from entering the next lens, and at the same time make the lens and the lens barrel better supported, thereby enhancing the structural stability of the optical lens system.

[0084] The first lens E1 has positive focal power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative focal power, its object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive focal power, its object side surface S5 is convex, and the image side surface S6 is convex. The fourth lens E4 has positive focal power, its object side surface S7 is concave, and the image side surface S8 is convex. The fifth lens E5 has negative focal power, its object side surface S9 is concave, and the image side surface S10 is concave. The filter has an object side surface S11 (not shown) and an image side surface S12 (not shown). The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13 (not shown).

[0085] Table 1 shows the basic parameters of the optical lens system of Example 1, wherein the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0086]

[0087] Table 1

[0088] In this embodiment, the total effective focal length f of the optical lens system is 3.8836 mm, the combined focal length f34 of the third lens and the fourth lens is 2.2684 mm, the combined focal length f45 of the fourth lens and the fifth lens is -10.3628 mm, and the axial distance TD from the object side surface of the first lens to the image side surface of the fifth lens is 3.9563 mm.

[0089] In this embodiment, the object side surface and the image side surface of any lens among the first lens E1 to the fifth lens E5 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0090]

[0091] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75, A76, A77, A8, A59, A60, A78, A80, A81, A81, A90, A91, A10, A110, A120, A130, A140, A151, A161, A171, A18, A19, A20, A21 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0092] Face number A4 A6 A8 A10 A12 A14 A16 S1 6.4926E-02 8.4235E-03 1.8390E-03 5.1499E-04 1.5884E-04 4.8572E-05 1.7091E-05 S2 -2.0567E-02 9.5401E-03 6.6834E-05 4.0382E-04 5.9789E-05 1.8954E-05 6.5200E-06 S3 -1.0199E-01 9.1806E-03 -2.2619E-03 4.2341E-06 -4.1632E-05 -2.5895E-05 -1.0373E-05 S4 -3.1272E-02 9.8608E-03 -7.8516E-04 1.0295E-04 1.2927E-05 -5.8251E-06 -5.0129E-06 S5 -4.5381E-02 3.2615E-03 7.5776E-04 3.6633E-04 5.1493E-05 2.8188E-05 -1.3009E-05 S6 -1.6417E-01 -3.4800E-03 7.4181E-04 4.7174E-04 1.9819E-04 6.0041E-05 3.2091E-05 S7 -2.7735E-01 9.4686E-03 7.0061E-03 2.9400E-03 2.8997E-03 7.5238E-04 -6.8614E-04 S8 7.9840E-01 -2.9385E-02 4.5544E-03 -1.2082E-02 8.4986E-03 -7.6442E-04 -1.1643E-03 S9 1.7347E-01 1.4864E-01 -4.0914E-02 -5.9210E-03 8.2175E-03 -2.0732E-03 2.0689E-04 S10 -2.5486E+00 4.2361E-01 -1.2433E-01 5.0559E-02 -1.7505E-02 6.6976E-03 -2.9495E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 7.4131E-06 -3.9018E-07 3.4090E-07 -1.9134E-06 -1.1747E-06 -2.0877E-06 -2.5460E-07 S2 4.3679E-06 3.4152E-06 3.8954E-07 -1.2979E-06 -3.3237E-06 -3.0005E-06 -1.4058E-06 S3 -1.5869E-07 -5.1446E-06 -1.6625E-06 -2.1514E-06 2.0205E-06 1.9651E-06 1.8835E-06 S4 3.9791E-06 4.1315E-07 2.7699E-06 4.5111E-07 1.0039E-07 -1.7367E-07 -5.7286E-07 S5 7.9310E-06 -5.5069E-06 3.9104E-06 -2.2442E-06 1.9574E-06 -1.3279E-06 2.6754E-07 S6 -5.5543E-06 9.5871E-06 -2.3201E-06 7.2740E-06 -8.8243E-06 3.6706E-06 -4.8523E-07 S7 -4.9599E-04 -5.4045E-05 6.4405E-05 5.3917E-05 -2.0823E-06 -5.5447E-06 -3.6431E-07 S8 -2.1069E-04 4.8089E-04 -7.1485E-05 -5.6513E-05 -6.3682E-06 1.8718E-05 -3.9228E-06 S9 -5.7441E-04 5.5580E-04 -2.2838E-04 8.4937E-05 -7.0483E-05 4.4530E-05 -1.0598E-05 S10 1.2383E-03 -4.0567E-04 1.3102E-04 -5.4916E-05 -1.6779E-05 2.5656E-05 -3.7068E-06

[0093] Table 2

[0094] Example 2

[0095] The following reference Figure 3 Describe the optical lens system according to Example 2 of the present application.

[0096] like Figure 3 As shown, the optical lens system includes a lens barrel and a five-piece lens group and a spacer group placed in the lens barrel. The five-piece lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 in sequence from the object side to the image side along the optical axis. The aperture STO can be arranged between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The spacer group also includes a third auxiliary spacer P3b. The spacer can block excess light in the imaging process from entering the next lens, and at the same time make the lens and the lens barrel better supported, thereby enhancing the structural stability of the optical lens system.

[0097] The structure of the lens of this embodiment is the same as that of the lens of Embodiment 1, that is, the basic parameter table of the optical lens system of this embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. The difference between this embodiment and Embodiment 1 is that the structure dimensions of the lens barrel, the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, the third auxiliary spacer P3b and the fourth auxiliary spacer P4b are different. For example, the parameters such as d2s, d2m, d3s, d3m, D3m, d3bs, D3bm, d4s, d4m, D4m, d4bm, D4bm, d0s, EP01, CP1, EP23, CP3, CP3b, EP34, CP4 are different.

[0098] Example 3

[0099] The following reference Figure 4 Describe the optical lens system according to Example 3 of the present application.

[0100] like Figure 4 As shown, the optical lens system includes a lens barrel and a five-piece lens group and a spacer group placed in the lens barrel. The five-piece lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 in sequence from the object side to the image side along the optical axis. The aperture STO can be arranged between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The spacer group also includes a third auxiliary spacer P3b and a fourth auxiliary spacer P4b. The spacer can block excess light in the imaging process from entering the next lens, and at the same time make the lens and the lens barrel better supported, thereby enhancing the structural stability of the optical lens system.

[0101] The structure of the lens of this embodiment is the same as that of the lens of Embodiment 1, that is, the basic parameter table of the optical lens system of this embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. The difference between this embodiment and Embodiment 1 is that the structure dimensions of the lens barrel, the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, the third auxiliary spacer P3b and the fourth auxiliary spacer P4b are different. For example, the parameters such as d2s, d2m, d3s, d3m, D3m, d3bs, D3bm, d4s, d4m, D4m, d4bm, D4bm, d0s, EP01, CP1, EP23, CP3, CP3b, EP34, CP4 are different.

[0102] Figure 5A The axial chromatic aberration curves of the optical lens systems of Examples 1, 2, and 3 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the optical lens system. Figure 5B Astigmatism curves of the optical lens systems of Examples 1, 2, and 3 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 5C The distortion curves of the optical lens systems of Examples 1, 2, and 3 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 5D The magnification chromatic aberration curves of the optical lens systems of Examples 1, 2, and 3 are shown, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. FIG. 5A to FIG. 5D It can be seen that the optical lens systems provided in Examples 1, 2 and 3 can achieve good imaging quality.

[0103] Example 4

[0104] The following reference Figure 6 Describe the optical lens system according to Example 4 of the present application.

[0105] like Figure 6 As shown, the optical lens system includes a lens barrel and a five-piece lens group and a spacer group placed in the lens barrel. The five-piece lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 in sequence from the object side to the image side along the optical axis. The aperture STO can be arranged between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The spacer group also includes a third auxiliary spacer P3b. The spacer can block excess light in the imaging process from entering the next lens, and at the same time make the lens and the lens barrel better supported, thereby enhancing the structural stability of the optical lens system.

[0106] The first lens E1 has positive focal power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative focal power, its object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive focal power, its object side surface S5 is convex, and the image side surface S6 is convex. The fourth lens E4 has positive focal power, its object side surface S7 is concave, and the image side surface S8 is convex. The fifth lens E5 has negative focal power, its object side surface S9 is concave, and the image side surface S10 is concave. The filter has an object side surface S11 (not shown) and an image side surface S12 (not shown). The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13 (not shown).

[0107] Table 3 shows the basic parameters of the optical lens system of Example 4, wherein the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0108]

[0109] Table 3

[0110] In this embodiment, the total effective focal length f of the optical lens system is 3.9267 mm, the combined focal length f34 of the third lens and the fourth lens is 2.2595 mm, the combined focal length f45 of the fourth lens and the fifth lens is -10.9105 mm, and the axial distance TD from the object side surface of the first lens to the image side surface of the fifth lens is 3.9544 mm.

[0111] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the fifth lens E5 are both aspherical surfaces. Table 4 lists the high-order coefficients A4, A6, A8, A9, A10, A20, A30, A40, A50, A60, A70, A80, A90, A100 that can be used for the aspherical surfaces S1-S10 in Embodiment 4. 10 , A 12, A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0112]

[0113]

[0114] Table 4

[0115] Example 5

[0116] The following reference Figure 7 Describe the optical lens system according to Example 5 of the present application.

[0117] like Figure 7 As shown, the optical lens system includes a lens barrel and a five-piece lens group and a spacer group placed in the lens barrel. The five-piece lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 in sequence from the object side to the image side along the optical axis. The aperture STO can be arranged between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The spacer group also includes a third auxiliary spacer P3b and a fourth auxiliary spacer P4b. The spacer can block excess light in the imaging process from entering the next lens, and at the same time make the lens and the lens barrel better supported, thereby enhancing the structural stability of the optical lens system.

[0118] The structure of the lens of this embodiment is the same as that of the lens of embodiment 4, that is, the basic parameter table of the optical lens system of this embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. The difference between this embodiment and embodiment 4 is that the structure and size of the lens barrel, the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, the third auxiliary spacer P3b and the fourth auxiliary spacer P4b are different. For example, the parameters such as d2s, d2m, d3s, d3m, D3m, d3bs, D3bm, d4s, d4m, D4m, d4bm, D4bm, d0s, EP01, CP1, EP23, CP3, CP3b, EP34, CP4 are different.

[0119] Example 6

[0120] The following reference Figure 8 Describe the optical lens system according to Example 6 of the present application.

[0121] like Figure 8 As shown, the optical lens system includes a lens barrel and a five-piece lens group and a spacer group placed in the lens barrel. The five-piece lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 in sequence from the object side to the image side along the optical axis. The aperture STO can be arranged between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The spacer group also includes a third auxiliary spacer P3b. The spacer can block excess light in the imaging process from entering the next lens, and at the same time make the lens and the lens barrel better supported, thereby enhancing the structural stability of the optical lens system.

[0122] The structure of the lens of this embodiment is the same as that of the lens of embodiment 4, that is, the basic parameter table of the optical lens system of this embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. The difference between this embodiment and embodiment 4 is that the structure and size of the lens barrel, the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, the third auxiliary spacer P3b and the fourth auxiliary spacer P4b are different. For example, the parameters such as d2s, d2m, d3s, d3m, D3m, d3bs, D3bm, d4s, d4m, D4m, d4bm, D4bm, d0s, EP01, CP1, EP23, CP3, CP3b, EP34, CP4 are different.

[0123] Fig.9A The axial chromatic aberration curves of the optical lens systems of Examples 4, 5, and 6 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the optical lens system. Fig. 9B Astigmatism curves of the optical lens systems of Examples 4, 5, and 6 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig. 9C The distortion curves of the optical lens systems of Examples 4, 5, and 6 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Fig.9D The magnification chromatic aberration curves of the optical lens systems of Examples 4, 5, and 6 are shown, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. 9A to 9D It can be seen that the optical lens systems provided in Examples 4, 5 and 6 can achieve good imaging quality.

[0124] Example 7

[0125] The following reference Fig.10 Describe the optical lens system according to Example 7 of the present application.

[0126] like Fig.10As shown, the optical lens system includes a lens barrel and a five-piece lens group and a spacer group placed in the lens barrel. The five-piece lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 in sequence from the object side to the image side along the optical axis. The aperture STO can be arranged between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The spacer group also includes a third auxiliary spacer P3b. The spacer can block excess light in the imaging process from entering the next lens, and at the same time make the lens and the lens barrel better supported, thereby enhancing the structural stability of the optical lens system.

[0127] The first lens E1 has positive focal power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative focal power, its object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive focal power, its object side surface S5 is convex, and the image side surface S6 is convex. The fourth lens E4 has positive focal power, its object side surface S7 is concave, and the image side surface S8 is convex. The fifth lens E5 has negative focal power, its object side surface S9 is concave, and the image side surface S10 is concave. The filter has an object side surface S11 (not shown) and an image side surface S12 (not shown). The light from the object passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13 (not shown).

[0128] Table 5 shows the basic parameter table of the optical lens system of Example 7, wherein the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0129]

[0130]

[0131] Table 5

[0132] In this embodiment, the total effective focal length f of the optical lens system is 3.8962 mm, the combined focal length f34 of the third lens and the fourth lens is 2.2750 mm, the combined focal length f45 of the fourth lens and the fifth lens is -10.0648 mm, and the axial distance TD from the object side surface of the first lens to the image side surface of the fifth lens is 3.9823 mm.

[0133] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the fifth lens E5 are both aspherical surfaces. Table 6 lists the high-order coefficients A4, A6, A8, A9, A10, A20, A30, A40, A50, A60, A70, A80, A90, A100 that can be used for the aspherical surfaces S1-S10 in Embodiment 7. 10 , A 12 , A 14 , A 16 , A 18 , A20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0134] Face number A4 A6 A8 A10 A12 A14 A16 S1 6.4449E-02 8.3764E-03 1.8906E-03 4.8670E-04 1.7506E-04 3.9206E-05 2.3477E-05 S2 -2.2071E-02 1.0212E-02 7.4758E-05 4.4051E-04 6.5085E-05 2.2981E-05 4.1054E-06 S3 -1.0391E-01 9.4355E-03 -2.1543E-03 1.9152E-05 -1.6769E-05 -2.4222E-05 -5.2720E-06 S4 -3.3252E-02 9.7310E-03 -9.0985E-04 1.0595E-04 7.8598E-06 2.3357E-07 -1.0424E-05 S5 -5.1634E-02 2.5860E-03 5.4847E-04 3.5007E-04 8.1150E-05 3.6504E-05 -7.8788E-06 S6 -1.6729E-01 -3.5646E-03 1.3352E-03 1.2593E-03 6.7144E-04 2.7834E-04 9.6611E-05 S7 -2.6998E-01 1.0640E-02 5.1286E-03 4.4544E-03 2.3878E-03 -4.7932E-04 -1.2236E-03 S8 8.0246E-01 -3.0407E-02 3.1926E-03 -1.2473E-02 8.7001E-03 -6.1334E-04 -9.6399E-04 S9 1.6149E-01 1.4721E-01 -4.0467E-02 -5.5444E-03 8.3604E-03 -2.1479E-03 1.8326E-04 S10 -2.5234E+00 4.1960E-01 -1.2885E-01 4.9789E-02 -1.7817E-02 6.7761E-03 -2.9439E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 3.5047E-06 2.6090E-06 -1.1022E-06 -2.2032E-07 -8.2340E-07 -9.0136E-07 -9.7884E-07 S2 5.0853E-06 2.2101E-06 2.3401E-06 5.9612E-07 -1.0223E-06 -2.6877E-06 -1.3624E-06 S3 2.8675E-06 -1.3330E-06 -2.3595E-06 -3.4144E-06 -1.2208E-06 9.6283E-07 1.4086E-06 S4 6.2006E-06 -2.4437E-06 3.0044E-06 -8.9814E-07 1.4554E-06 -5.5790E-07 -1.6507E-07 S5 3.6806E-06 -8.3608E-06 3.6418E-06 -6.9730E-07 2.3529E-06 -2.4260E-06 6.3321E-07 S6 1.7797E-05 7.8427E-06 -1.1041E-05 -2.9253E-06 -6.3812E-06 1.7486E-06 2.3125E-07 S7 -5.1965E-04 8.0216E-06 1.0032E-04 7.2012E-05 1.6544E-05 -5.8893E-07 -4.4652E-06 S8 -3.3112E-04 3.8887E-04 -2.1630E-05 -3.0787E-05 -1.3300E-07 1.3036E-05 -7.8501E-06 S9 -5.6008E-04 5.3919E-04 -2.4050E-04 8.5242E-05 -6.4697E-05 4.7035E-05 -1.1965E-05 S10 1.2615E-03 -4.4020E-04 1.1395E-04 -5.0691E-05 -1.2236E-05 3.0612E-05 -7.4365E-06

[0135] Table 6

[0136] Example 8

[0137] The following reference Fig.11 Describe the optical lens system according to Example 8 of the present application.

[0138] like Fig.11 As shown, the optical lens system includes a lens barrel and a five-piece lens group and a spacer group placed in the lens barrel. The five-piece lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 in sequence from the object side to the image side along the optical axis. The aperture STO can be arranged between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The spacer group also includes a third auxiliary spacer P3b and a fourth auxiliary spacer P4b. The spacer can block excess light in the imaging process from entering the next lens, and at the same time make the lens and the lens barrel better supported, thereby enhancing the structural stability of the optical lens system.

[0139] The structure of the lens of this embodiment is the same as that of the lens of embodiment 7, that is, the basic parameter table of the optical lens system of this embodiment is the same as Table 5, and the aspheric coefficient table is the same as Table 6. The difference between this embodiment and embodiment 7 is that the structure dimensions of the lens barrel, the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, the third auxiliary spacer P3b and the fourth auxiliary spacer P4b are different. For example, the parameters such as d2s, d2m, d3s, d3m, D3m, d3bs, D3bm, d4s, d4m, D4m, d4bm, D4bm, d0s, EP01, CP1, EP23, CP3, CP3b, EP34, CP4 are different.

[0140] Example 9

[0141] The following reference Fig.12 Describe the optical lens system according to Example 9 of the present application.

[0142] like Fig.12As shown, the optical lens system includes a lens barrel and a five-piece lens group and a spacer group placed in the lens barrel. The five-piece lens group includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 in sequence from the object side to the image side along the optical axis. The aperture STO can be arranged between the object side and the first lens E1. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The spacer group also includes a third auxiliary spacer P3b and. The spacer can block excess light in the imaging process from entering the next lens, while allowing the lens to better support the lens barrel, thereby enhancing the structural stability of the optical lens system.

[0143] The structure of the lens of this embodiment is the same as that of the lens of embodiment 7, that is, the basic parameter table of the optical lens system of this embodiment is the same as Table 5, and the aspheric coefficient table is the same as Table 6. The difference between this embodiment and embodiment 7 is that the structure dimensions of the lens barrel, the first spacer P1, the second spacer P2, the third spacer P3, the fourth spacer P4, the third auxiliary spacer P3b and the fourth auxiliary spacer P4b are different. For example, the parameters such as d2s, d2m, d3s, d3m, D3m, d3bs, D3bm, d4s, d4m, D4m, d4bm, D4bm, d0s, EP01, CP1, EP23, CP3, CP3b, EP34, CP4 are different.

[0144] Fig.13A The axial chromatic aberration curves of the optical lens systems of Examples 7, 8, and 9 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the optical lens system. Fig. 13B The astigmatism curves of the optical lens systems of Examples 7, 8, and 9 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig. 13C The distortion curves of the optical lens systems of Examples 7, 8, and 9 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Fig.13D The magnification chromatic aberration curves of the optical lens systems of Examples 7, 8, and 9 are shown, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. FIG. 13A to FIG. 13D It can be seen that the optical lens systems provided in Examples 7, 8 and 9 can achieve good imaging quality.

[0145] Table 7 shows the values ​​of parameters such as d2s, d2m, d3s, d3m, D3m, d3bs, D3bm, d4s, d4m, D4m, d4bm, D4bm, d0s, EP01, CP1, EP23, CP3, CP3b, EP34, and CP4 in each of Examples 1 to 9. The above parameters can be calculated according to Figure 1 The units of the parameters listed in Table 7 are all mm.

[0146] Parameters / Examples 1 2 3 4 5 6 7 8 9 d2s 2.1679 2.1679 2.1679 1.9861 1.9861 1.9861 2.1402 2.1402 2.1402 d2m 2.1679 2.1679 2.1679 1.9861 1.9861 1.9861 2.1402 2.1402 2.1402 d3s 3.8011 3.8011 3.8011 3.8711 3.8711 3.8711 3.3680 3.3680 3.3680 d3m 5.3618 5.3618 5.3618 4.9425 4.9425 4.9425 4.8237 4.8237 4.8237 D3m 6.5525 6.5525 6.5525 6.2824 6.2824 6.2824 6.5592 6.5592 6.5592 d4s 4.8137 4.3639 4.8137 4.3869 4.7750 4.3869 4.0869 4.7590 4.0869 d4m 5.3650 4.3639 5.3650 4.3869 5.3871 4.3869 4.0869 5.3779 4.0869 D4m 6.7816 6.8959 6.7816 6.7112 6.5785 6.7112 6.9026 6.6012 6.9026 d0s 3.2674 3.2674 3.2674 3.2904 3.2904 3.2904 3.2742 3.2742 3.2742 EP01 0.7488 0.7488 0.7488 0.7488 0.7488 0.7488 0.7488 0.7488 0.7488 CP1 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 EP23 0.5741 0.5741 0.5741 0.5564 0.5564 0.5564 0.4090 0.4090 0.4090 CP3 0.3122 0.3122 0.3122 0.3460 0.3460 0.3460 0.3400 0.3400 0.3400 EP34 0.4150 0.6649 0.4150 0.6290 0.3975 0.6290 0.7368 0.5857 0.7368 CP4 0.2500 0.0220 0.2500 0.0220 0.2315 0.0220 0.0220 0.3058 0.0220 d3bs 3.2967 3.2967 3.2967 3.2738 3.2738 3.2738 3.0720 3.0720 3.0720 D3b 6.7959 6.7959 6.7959 6.6112 6.6112 6.6112 6.8026 6.8026 6.8026 CP3b 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 d4bm 4.3639 / 4.3639 / 4.3869 / / 4.5272 / D4b 6.8959 / 6.8959 / 6.7112 / / 6.9026 /

[0147] Tables 7 and 8 show the values ​​of the conditional expressions of each embodiment in Embodiments 1 to 9.

[0148] Conditional / Example 1 2 3 4 5 6 7 8 9 T34 / T45 1.8021 1.8021 1.8021 1.9706 1.9706 1.9706 1.6996 1.6996 1.6996 D4m / f4 2.4094 2.4500 2.4094 2.4133 2.3656 2.4133 2.5058 2.3964 2.5058 f3 / CP3 23.4039 23.4039 23.4039 20.7009 20.7009 20.7009 21.0879 21.0879 21.0879 R9 / f5 1.5117 1.5117 1.5117 1.4576 1.4576 1.4576 1.4488 1.4488 1.4488 EP34 / T45 1.2986 2.0806 1.2986 1.9986 1.2630 1.9986 2.2275 1.7707 2.2275 f3 / d4m 1.3619 1.6744 1.3619 1.6327 1.3296 1.6327 1.7544 1.3332 1.7544 (D4m-d4m) / CT4 2.6745 4.7803 2.6745 4.0648 2.0835 4.0648 3.3786 1.4678 3.3786 R7 / R8 7.7539 7.7539 7.7539 7.3754 7.3754 7.3754 7.9018 7.9018 7.9018 R7 / (D3m-d4s) -6.0868 -4.8359 -6.0868 -5.2244 -6.5695 -5.2244 -4.3283 -5.9443 -4.3283 d3s / (f2+f3) -3.2625 -3.2625 -3.2625 -1.6879 -1.6879 -1.6879 -1.5240 -1.5240 -1.5240 EP23 / CT2 2.2964 2.2964 2.2964 1.4642 1.4642 1.4642 1.6360 1.6360 1.6360 R3 / d2s 1.4690 1.4690 1.4690 1.6324 1.6324 1.6324 1.4235 1.4235 1.4235 R4 / d2m 0.9098 0.9098 0.9098 1.0274 1.0274 1.0274 0.9257 0.9257 0.9257 f34 / (EP34+T34) 2.2892 1.8281 2.2892 1.8087 2.2202 1.8087 1.7514 1.9820 1.7514 d2m / R5+d3m / R6 -1.0176 -1.0176 -1.0176 -0.8857 -0.8857 -0.8857 -0.8551 -0.8551 -0.8551 f1 / d0s 1.2802 1.2802 1.2802 1.3714 1.3714 1.3714 1.3394 1.3394 1.3394 f1 / EP01 5.5861 5.5861 5.5861 6.0263 6.0263 6.0263 5.8567 5.8567 5.8567 (CP1+CT1) / T12 3.9982 3.9982 3.9982 3.9745 3.9745 3.9745 4.0208 4.0208 4.0208 T34 / (CP3+CP3b+CP4) 0.9858 1.6168 0.9858 1.5903 1.0345 1.5903 1.4640 0.8418 1.4640 f3 / (D3bm-d3bs) 2.0881 2.0881 2.0881 2.1461 2.1461 2.1461 1.9219 1.9219 1.9219 D4m / TD 1.7141 1.7430 1.7141 1.6972 1.6636 1.6972 1.7333 1.6576 1.7333 ATmax / Cpmax 1.8446 1.8446 1.8446 1.7925 1.7925 1.7925 1.6534 1.6534 1.6534 f45 / (D4bm-d4bm) -4.0927 / -4.0927 / -4.6941 / / -4.2371 /

[0149] Table 8

[0150] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens system described above.

[0151] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other.

Claims

1. An optical lens system, characterized in that Comprising: A five-piece lens group including a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, and a fifth lens with negative optical power arranged in sequence from the object side to the image side along the optical axis; An isolator group including a third isolator placed on and in contact with the image side surface of the third lens and a fourth isolator placed on and in contact with the image side surface of the fourth lens; And A lens barrel, wherein the five-piece lens group and the isolator group are placed in the lens barrel; Wherein, the air gap T34 between the third lens and the fourth lens on the optical axis and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 1.2 < T34 / T45 < 2.5; The effective focal length f4 of the fourth lens and the outer diameter D4m of the image side surface of the fourth isolator satisfy: 2 < D4m / f4 < 3; The effective focal length f3 of the third lens and the maximum thickness CP3 of the third isolator satisfy: 18 < f3 / CP3 < 25.

2. The optical lens system according to claim 1, characterized in that The effective focal length f5 of the fifth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 1 < R9 / f5 < 2; the interval EP34 between the third isolator and the fourth isolator along the optical axis and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 0.5 < EP34 / T45 < 2.7; the effective focal length f3 of the third lens and the inner diameter d4m of the image side surface of the fourth isolator satisfy: 1 < f3 / d4m < 2.

3. The optical lens system according to claim 1, wherein: The central thickness CT4 of the fourth lens on the optical axis, the inner diameter d4m of the image side surface of the fourth isolator, and the outer diameter D4m of the image side surface of the fourth isolator satisfy: 1 < (D4m - d4m) / CT4 < 5.

4. The optical lens system according to claim 1, wherein: The curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 7 < R7 / R8 < 8.5; the curvature radius R7 of the object side surface of the fourth lens, the outer diameter D3m of the image side surface of the third isolator, and the inner diameter d4s of the object side surface of the fourth isolator satisfy: -7 < R7 / (D3m - d4s) < -3.

5.

5. The optical lens system according to claim 1, wherein: The effective focal length f2 of the second lens, the effective focal length f3 of the third lens, and the inner diameter d3s of the object side surface of the third isolator satisfy: -4 < d3s / (f2 + f3) < -1.

6. The optical lens system according to any one of claims 1 to 5, characterized in that: The isolator group further includes a second isolator placed on and in contact with the image side surface of the second lens, Wherein, the central thickness CT2 of the second lens on the optical axis and the interval EP23 between the second isolator and the third isolator along the optical axis satisfy: 1 < EP23 / CT2 < 2.

9.

7. The optical lens system according to any one of claims 1 to 5, characterized in that: The isolator group further includes a second isolator placed on and in contact with the image side surface of the second lens, Among them, the radius of curvature R3 of the object side surface of the second lens and the inner diameter d2s of the object side surface of the second spacer satisfy: 1 < R3 / d2s < 2; the radius of curvature R4 of the image side surface of the second lens and the inner diameter d2m of the image side surface of the second spacer satisfy: 0.5 < R4 / d2m < 1.

5.

8. The optical lens system according to any one of claims 1 to 5, characterized in that: The combined focal length f34 of the third lens and the fourth lens, the air gap T34 between the third lens and the fourth lens on the optical axis, and the interval EP34 between the third spacer and the fourth spacer along the optical axis satisfy: 1 < f34 / (EP34 + T34) < 3.

9. The optical lens system according to any one of claims 1 to 5, characterized in that: The spacer group further includes a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens. Among them, the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, the inner diameter d2m of the image side surface of the second spacer, and the inner diameter d3m of the image side surface of the third spacer satisfy: -1.5 < d2m / R5 + d3m / R6 < -0.

2.

10. The optical lens system according to any one of claims 1 to 5, characterized in that: The spacer group further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens. Among them, the effective focal length f1 of the first lens and the inner diameter d0s of the object side end surface of the lens barrel satisfy: 0.5 < f1 / d0s < 2; the effective focal length f1 of the first lens and the interval EP01 between the object side end surface of the lens barrel and the first spacer along the optical axis satisfy: 5 < f1 / EP01 < 7.

11. The optical lens system according to any one of claims 1 to 5, characterized in that: The spacer group further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens. Among them, the central thickness CT1 of the first lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the maximum thickness CP1 of the first spacer satisfy: 3.5 < (CP1 + CT1) / T12 < 4.

5.

12. The optical lens system according to any one of claims 1 to 5, characterized in that: The spacer group further includes a third auxiliary spacer disposed on the image side surface of the third spacer and in contact with the image side surface of the third spacer. Among them, the air gap T34 between the third lens and the fourth lens on the optical axis, the maximum thickness CP3 of the third spacer, the maximum thickness CP3b of the third auxiliary spacer, and the maximum thickness CP4 of the fourth spacer satisfy: 0.5 < T34 / (CP3 + CP3b + CP4) < 2.

13. The optical lens system according to any one of claims 1 to 5, characterized in that: The spacer group further includes a third auxiliary spacer disposed on the image side surface of the third spacer and in contact with the image side surface of the third spacer. Among them, the effective focal length f3 of the third lens, the inner diameter d3bs of the object side surface of the third auxiliary spacer, and the outer diameter D3bm of the image side surface of the third auxiliary spacer satisfy: 1.5 < f3 / (D3bm - d3bs) < 2.

5.

14. The optical lens system according to any one of claims 1 to 5, characterized in that: The outer diameter D4m of the image side surface of the fourth spacer and the axial distance TD from the object side surface of the first lens to the image side surface of the fifth lens satisfy: 1.1 < D4m / TD < 2.

3.

15. The optical lens system according to any one of claims 1 to 5, characterized in that: The spacer set further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens, and a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens. The maximum value ATmax of the air gap between any two adjacent lenses from the first lens to the fifth lens and the maximum value CPmax of the maximum thickness of any spacer from the first spacer to the fourth spacer satisfy: 1.1 <ATmax / CPmax<2.4。 16. The optical lens system according to any one of claims 1 to 5, characterized in that: The spacer set further includes a fourth auxiliary spacer disposed on the image side of the fourth spacer and in contact with the image side of the fourth spacer, The combined focal length f45 of the fourth lens and the fifth lens, the inner diameter d4bm of the image side surface of the fourth auxiliary spacer, and the outer diameter D4bm of the image side surface of the fourth auxiliary spacer satisfy: <f45 / (D4bm-d4bm)<-3.5。

Images