Optical imaging device

Abstract

The invention provides an optical imaging apparatus. The optical imaging device comprises a lens barrel, a lens group and a spacing element group, and the lens group and the spacing element group are assembled in the lens barrel. The five lenses are sequentially a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with negative focal power and a fifth lens with positive focal power from the object side to the image side; the spacing element group comprises a first spacing element; the following conditions are satisfied:-2.18 lt; f1 / flt; -1.40,-1.40,-1.40; the following conditions are satisfied: 1.61 lt; t12 / CP1lt; 2.22, 2.22; the following conditions are satisfied: 3.50 lt; d1s / R2lt; and 5.45. The five-piece type optical imaging device solves the problems that in the prior art, a five-piece type optical imaging device controls the focal length and the distance of a front-end lens, so that a defocus curve of a modulation transfer function is discrete, and the peak value is low.

Description

Technical Field

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

[0002] With the continuous development of optical imaging technology, five-piece optical imaging devices have been widely used in many fields due to their advantages such as fewer lens elements and compact structure.

[0003] However, when controlling the focal length and spacing of the front lens in the existing five-piece optical imaging device, due to the limitations of design and manufacturing processes, the surface shape design of the front lens often fails to reach the ideal state. This unreasonable surface shape further affects the light propagation path, leading to the problem of discrete modulation transfer function (MTF) defocus curves. This discrete phenomenon not only reduces the imaging clarity and contrast but also makes it difficult for the optical imaging device to obtain stable and high-quality images.

[0004] That is to say, the existing five-piece optical imaging device has problems of discrete and low-peak modulation transfer function defocus curves when controlling the focal length and spacing of the front lens. Summary of the Invention

[0005] The main object of the present invention is to provide an optical imaging device to solve the problems of discrete and low-peak modulation transfer function defocus curves in the existing five-piece optical imaging device when controlling the focal length and spacing of the front lens.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided an optical imaging device including a lens barrel and a lens group and a spacer element group assembled in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with negative optical power, and a fifth lens with positive optical power. There is an air gap between adjacent two of the first lens to the fifth lens on the optical axis of the optical imaging device. The spacer element group includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens. Wherein, the effective focal length f1 of the first lens and the effective focal length f of the optical imaging device satisfy: -2.18 < f1 / f < -1.40; the air gap T12 between the first lens and the second lens on the optical axis and the maximum axial thickness CP1 of the first spacer element satisfy: 1.61 < T12 / CP1 < 2.22; the outer diameter D1s of the object side surface of the first spacer element and the curvature radius R2 of the image side surface of the first lens satisfy: 3.50 < D1s / R2 < 5.45.

[0007] Furthermore, the distance EP01 between the object side of the lens barrel and the object side of the first spacer element on the optical axis satisfies 2.46 < EP01 / CT1 < 4.95, where CT1 is the central thickness of the first lens on the optical axis.

[0008] Furthermore, the spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens. The inner diameter d4s of the object side of the fourth spacer element and the effective radius DT41 of the object side of the fourth lens satisfy 2.34 < d4s / DT41 < 3.31.

[0009] Furthermore, the distance L between the object side and the image side of the lens barrel on the optical axis, the outer diameter D0s of the object side of the lens barrel, and the outer diameter D0m of the image side of the lens barrel satisfy 2.46 < L / (D0m - D0s) < 2.67.

[0010] Furthermore, the spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image side of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens. The distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element on the optical axis and the axial distance SAG32 between the intersection of the image side of the third lens and the optical axis and the vertex of the effective radius of the image side of the third lens satisfy 2.15 < EP34 / |SAG32| < 3.15.

[0011] Furthermore, the spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image side of the third lens. The inner diameter d3s, the outer diameter D3s of the object side of the third spacer element, and the effective radius DT32 of the image side of the third lens satisfy 3.41 < (D3s - d3s) / DT32 < 4.89.

[0012] Furthermore, the spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image side of the third lens. The inner diameter d3s, the outer diameter D3s of the object side of the third spacer element, and the effective focal length f3 of the third lens satisfy 1.77 < (D3s - d3s) / f3 < 2.67.

[0013] Furthermore, the spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens. The axial distance EP34 on the optical axis from the image side surface of the third spacer element to the object side surface of the fourth spacer element and the combined focal length f34 of the third lens and the fourth lens satisfy: -6.13 < f34 / EP34 < -2.11.

[0014] Furthermore, the inner diameter d1s of the object side surface of the first spacer element, the inner diameter d1m of the image side surface of the first spacer element, and the maximum axial thickness CP1 of the first spacer element satisfy: 0.60 < (d1s - d1m) / CP1 < 0.89.

[0015] Furthermore, the spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens. The inner diameter d4m of the image side surface of the fourth spacer element, the outer diameter D4m of the image side surface of the fourth spacer element, and the radius of curvature of the image side surface of the fourth lens satisfy: 0.40 < (D4m - d4m) / R8 < 2.22.

[0016] Furthermore, the spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens. The axial distance SAG22 on the optical axis from the intersection point of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens and the axial distance EP12 on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element satisfy: 4.99 < EP12 / |SAG22| < 9.28.

[0017] Furthermore, the spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens. The radius of curvature R8 of the image side surface of the fourth lens, the effective focal length f4 of the fourth lens, the axial distance EP34 on the optical axis from the image side surface of the third spacer element to the object side surface of the fourth spacer element, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 。

[0018] Furthermore, the axial distance SAG12 on the optical axis from the intersection point of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens and the axial distance EP01 on the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element satisfy: 2.75 < EP01 / |SAG12| < 3.72.

[0019] Further, the following condition is satisfied between the maximum radius rd1 of the first lens and the maximum radial width z1 of the contact area between the image side surface of the first lens and the object side surface of the first spacer element: 2.24 < rd1 / z1 < 4.10.

[0020] Further, the spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens. The following condition is satisfied among the inner diameter d4m of the image side surface of the fourth spacer element, the outer diameter D4m of the image side surface of the fourth spacer element, and the effective radius DT51 of the object side surface of the fifth lens: 0.85 < (D4m - d4m) / DT51 < 3.20.

[0021] Applying the technical solution of the present invention, the optical powers of the five lenses in the optical imaging device of the present application are sequentially distributed as negative, positive, positive, negative, and positive. When -2.18 < f1 / f < -1.40 and 1.61 < T12 / CP1 < 2.22 are satisfied, the proportion of the effective focal length of the first lens in the effective focal length of the optical imaging device is slightly larger, the first lens is more sensitive, and the central distance between the first lens and the second lens on the optical axis is greater than the edge distance between the first lens and the second lens on the optical axis. The travel of light between the first lens and the second lens is large, further amplifying the sensitivity of the image side surface of the first lens. At this time, the matching problem between the first spacer element and the curvature radius of the image side surface of the first lens needs to be considered. The present application restricts 3.50 < D1s / R2 < 5.45, and by controlling the curvature radius of the image side surface of the first lens, the ratio of the outer diameter of the object side surface of the first spacer element to the curvature radius of the image side surface of the first lens is restricted within a suitable range, so as to control the refraction angle of the image side surface of the first lens to meet the requirements, ensure the matching degree between the surface shape of the image side surface of the first lens and the first spacer element, help control the sensitivity of the image side surface of the first lens, ensure the effectiveness of light transmission, and is beneficial to improving the problems of discrete points and peak drop of the modulation transfer function defocus curve, so that the peak value of the modulation transfer function reaches the design requirements and the field curvature reaches the optimal state, making the performance of the optical imaging device more stable. Description of the Drawings

[0022] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0023] Figure 1 A dimension marking schematic diagram of an optical imaging device according to an optional embodiment of the present invention is shown;

[0024] Figure 2 Another dimension marking schematic diagram of an optical imaging device according to an optional embodiment of the present invention is shown;

[0025] Figure 3 Shows the structural schematic diagram of the optical imaging device according to the first embodiment of the present invention;

[0026] Figure 4 Shows the structural schematic diagram of the optical imaging device according to the second embodiment of the present invention;

[0027] Figure 5 Shows the structural schematic diagram of the optical imaging device according to the third embodiment of the present invention;

[0028] Figure 6 Shows the axial chromatic aberration curve of the optical imaging device according to the first embodiment;

[0029] Figure 7 Shows the astigmatism curve of the optical imaging device according to the first embodiment;

[0030] Figure 8 Shows the longitudinal chromatic aberration curve of the optical imaging device according to the first embodiment;

[0031] Figure 9 Shows the structural schematic diagram of the optical imaging device according to the fourth embodiment of the present invention;

[0032] Figure 10 Shows the structural schematic diagram of the optical imaging device according to the fifth embodiment of the present invention;

[0033] Figure 11 Shows the structural schematic diagram of the optical imaging device according to the sixth embodiment of the present invention;

[0034] Figure 12 Shows the axial chromatic aberration curve of the optical imaging device according to the fourth embodiment;

[0035] Figure 13 Shows the astigmatism curve of the optical imaging device according to the fourth embodiment;

[0036] Figure 14 Shows the longitudinal chromatic aberration curve of the optical imaging device according to the fourth embodiment;

[0037] Figure 15 Shows the structural schematic diagram of the optical imaging device according to the seventh embodiment of the present invention;

[0038] Figure 16 Shows the structural schematic diagram of the optical imaging device according to the eighth embodiment of the present invention;

[0039] Figure 17 Shows the structural schematic diagram of the optical imaging device according to the ninth embodiment of the present invention;

[0040] Figure 18 Shows the axial chromatic aberration curve of the optical imaging device according to the seventh embodiment;

[0041] Figure 19 Shows the astigmatism curve of the optical imaging device of Embodiment VII;

[0042] Figure 20 Shows the longitudinal chromatic aberration curve of the optical imaging device of Embodiment VII;

[0043] Figure 21 Shows the modulation transfer function defocus curve of the optical imaging device of Solution 1 of the present invention when f1 / f = -1.44, T12 / CP1 = 1.88, and D1s / R2 = 4.71;

[0044] Figure 22 Shows the modulation transfer function defocus curve of the optical imaging device of Comparative Example 1 when f1 / f = -1.44, T12 / CP1 = 1.88, and D1s / R2 = 2.90;

[0045] Figure 23 Shows the modulation transfer function defocus curve of the optical imaging device of Comparative Example 2 when f1 / f = -1.44, T12 / CP1 = 1.88, and D1s / R2 = 6.20.

[0046] Among them, the above-mentioned drawings include the following reference numerals:

[0047] P0, lens barrel; E1, first lens; P1, first spacer element; E2, second lens; P2, second spacer element; E3, third lens; P3, third spacer element; E4, fourth lens; P4, fourth spacer element; E5, fifth lens; S1, object side of the first lens; S2, image side of the first lens; S3, object side of the second lens; S4, image side of the second lens; S5, object side of the third lens; S6, image side of the third lens; S7, object side of the fourth lens; S8, image side of the fourth lens; S9, object side of the fifth lens; S10, image side of the fifth lens. Detailed Embodiments

[0048] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0049] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0050] In the present invention, unless otherwise specified, the orientation terms such as "upper", "lower", "top", and "bottom" generally refer to the directions shown in the drawings, or to the vertical, perpendicular, or gravitational directions of the components themselves; similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer of the contours of the respective components themselves, but the above orientation terms are not used to limit the present invention.

[0051] 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 teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0052] In the drawings, for the convenience of illustration, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn to an exact scale.

[0053] 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 judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in this field, and the positive and negative of the R value (R refers to the radius of curvature of the paraxial region, usually the R value on the lens database (lens data) in optical software) is used to judge the convexity and concavity. Taking the object side surface as an example, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; taking the image side surface as an example, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0054] In the present application, the object side refers to the side of the optical imaging device facing the object to be photographed (not shown in the figure), and the image side refers to the side of the optical imaging device facing the imaging surface (not shown in the figure). In the following text, the object side surface of the lens refers to the surface on the side of the lens facing the object to be photographed (not shown in the figure), and the image side surface of the lens refers to the surface on the side of the lens facing the imaging surface (not shown in the figure). In the schematic structural diagram shown in the present application, the left side is the object side and the right side is the image side.

[0055] In order to solve the problems in the prior art that the five-piece optical imaging device has the problems of controlling the focal length and spacing of the front lens, resulting in discrete and low-peak modulation transfer function defocus curves, the present invention provides an optical imaging device.

[0056] Such as Figures 1 to 21As shown, in an alternative embodiment of the present application, the optical imaging device includes a lens barrel and a lens group and a spacer element group assembled in the lens barrel. The lens group consists of five lenses. The five lenses are, in order from the object side to the image side, a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, and a fifth lens with a positive optical power. There is an air gap between adjacent two of the first lens to the fifth lens on the optical axis of the optical imaging device; the spacer element group includes a first spacer element placed between the first lens and the second lens and in contact with the image side surface of the first lens; wherein, the effective focal length f1 of the first lens and the effective focal length f of the optical imaging device satisfy: -2.18 < f1 / f < -1.40; the air gap T12 between the first lens and the second lens on the optical axis and the maximum axial thickness CP1 of the first spacer element satisfy: 1.61 < T12 / CP1 < 2.22; the outer diameter D1s of the object side surface of the first spacer element and the curvature radius R2 of the image side surface of the first lens satisfy: 3.50 < D1s / R2 < 5.45.

[0057] The optical powers of the five lenses in the optical imaging device of the present application are sequentially distributed as negative, positive, positive, negative, and positive. When -2.18 < f1 / f < -1.40 and 1.61 < T12 / CP1 < 2.22 are satisfied, the proportion of the effective focal length of the first lens in the effective focal length of the optical imaging device is slightly larger, the first lens is more sensitive, and the central distance between the first lens and the second lens on the optical axis is greater than the edge distance between the first lens and the second lens on the optical axis. The travel of light between the first lens and the second lens is large, further amplifying the sensitivity of the image side surface of the first lens. At this time, the matching problem between the first spacer element and the curvature radius of the image side surface of the first lens needs to be considered. The present application restricts 3.50 < D1s / R2 < 5.45, and by controlling the curvature radius of the image side surface of the first lens, the ratio of the outer diameter of the object side surface of the first spacer element to the curvature radius of the image side surface of the first lens is restricted within a suitable range, so as to control the refraction angle of the image side surface of the first lens to meet the requirements, ensure the matching degree between the surface shape of the image side surface of the first lens and the first spacer element, help control the sensitivity of the image side surface of the first lens, ensure the effectiveness of light transmission, and is beneficial to improving the problems of dispersion of the modulation transfer function defocus curve and peak drop, so that the peak of the modulation transfer function reaches the design requirements and the field curvature reaches the best state, making the performance of the optical imaging device more stable.

[0058] In addition, as shown in Table 1 below, Figures 21 to 23 on the basis that the optical imaging device satisfies f1 / f = -1.44 and T12 / CP1 = 1.88, Figure 21 shows the modulation transfer function defocus curve diagram when the optical imaging device of Solution 1 of the present application satisfies D1s / R2 = 4.71.Figure 22 The modulation transfer function defocus curve diagram when the optical imaging device of Comparative Example 1 satisfies D1s / R2 = 2.90 is shown. Figure 23 The modulation transfer function defocus curve diagram when the optical imaging device of Comparative Example 2 satisfies D1s / R2 = 6.20 is shown. In Figures 21 to 23 it, the first field of view is 0F, the second field of view is 0.5F, and the third field of view is 1.0F.

[0059] It can be Figures 21 to 23 seen that when the optical imaging device satisfies D1s / R2 = 4.71, the modulation transfer function defocus curves are relatively concentrated, the peaks of most fields of view are relatively high, it can meet the requirements, the optical sensitivity is relatively low, and the performance is relatively good. When the optical imaging device satisfies D1s / R2 = 2.90, the field curvature is biased, the peaks of the overall field of view are relatively low, it is more sensitive to eccentricity and tilt, and the performance is relatively poor. When the optical imaging device satisfies D1s / R2 = 6.20, the MTF peaks of most fields of view are relatively low, which does not meet the design requirements, and the performance is relatively poor.

[0060] Thus, it can be seen that when -2.18 < f1 / f < -1.40 and 1.61 < T12 / CP1 < 2.22 and D1s / R2 is controlled within the range of 3.50 to 5.45, the defocus curves of each field of view of the optical imaging device are relatively concentrated, the peaks of most fields of view are relatively high, the optical sensitivity is relatively low, and the performance is relatively good. Therefore, by restricting 2.18 < f1 / f < -1.40, 1.61 < T12 / CP1 < 2.22, and 3.50 < D1s / R2 < 5.45 in this application, it is possible to control the curvature radius of the image side surface of the first lens to be large enough, so as to control the refraction angle of the light rays by the image side surface of the first lens to meet the requirements. At the same time, it can ensure the matching degree between the surface shape of the image side surface of the first lens and the first spacer element, ensure the effectiveness of light transmission, which is beneficial to improving the discrete problem of the modulation transfer function defocus curve and the problem of peak drop, so that the modulation transfer function peak reaches the design requirements, the field curvature reaches the optimal state, and the performance of the optical imaging device is more stable.

[0061] Table 1

[0062]

[0063] In this embodiment, the spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens.

[0064] In this embodiment, the distance EP01 on the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element and the central thickness CT1 of the first lens on the optical axis satisfy: 2.46 < EP01 / CT1 < 4.95. By restricting the ratio of EP01 to CT1 within a certain range, the surface shape of the first lens can be effectively controlled within a reasonable range, making the overall thickness of the first lens more uniform, which is beneficial to the molding of the first lens and at the same time ensures the use effect of the first lens.

[0065] In this embodiment, the inner diameter d4s of the object side surface of the fourth spacer element and the effective radius DT41 of the object side surface of the fourth lens satisfy: 2.34 < d4s / DT41 < 3.31. By controlling the range of this ratio, the fourth spacer element can effectively block the redundant optical paths generated by the mechanism parts other than the effective diameter parts of the second lens and the third lens, avoid the formation of ineffective optical paths, avoid the generation of stray light, and is beneficial to improving the imaging quality.

[0066] It should also be noted that the above-mentioned ineffective optical paths refer to those light rays that do not participate in the imaging process. This includes those light rays that enter the optical imaging device but do not focus on the imaging surface, or are scattered, reflected, and absorbed inside the optical imaging device. Ineffective light rays can be caused by physical limitations in the design of the optical imaging device, or may be caused by factors such as unevenness, dust, scratches, or uneven coating on the lens surface. Ineffective light rays not only cannot improve the image quality, but may instead cause image blurring, reduced contrast, or produce adverse effects such as spots and glare.

[0067] In this embodiment, the distance L on the optical axis from the object side surface of the lens barrel to the image side surface of the lens barrel, the outer diameter D0s of the object side surface of the lens barrel, and the outer diameter D0m of the image side surface of the lens barrel satisfy: 2.46 < L / (D0m - D0s) < 2.67. By controlling this condition, on the one hand, the dimensions of the structure at the object side end of the lens barrel and the dimensions of the structure at the image side end of the lens barrel can be controlled within a reasonable range, and while meeting the optical performance, the overall length of the optical imaging device on the optical axis can be minimized; on the other hand, the radial wall thickness of the lens barrel is more uniform while meeting the molding requirements, and the molding stress of the lens barrel is minimized.

[0068] In this embodiment, the axial distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element on the optical axis satisfies 2.15 < EP34 / |SAG32| < 3.15 with respect to the axial distance SAG32 between the intersection of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens. By controlling this condition, the edge axial thickness of the third lens can be effectively controlled within a certain range, and at the same time, the necking at the edges of the effective diameter portions of the object side surface and the image side surface of the third lens can be increased as much as possible to meet the molding requirements, and the axial thickness at other positions of the third lens except the necking position can be made as uniform as possible.

[0069] In this embodiment, the inner diameter d3s of the object side surface of the third spacer element, the outer diameter D3s of the object side surface of the third spacer element, and the effective radius DT32 of the image side surface of the third lens satisfy 3.41 < (D3s - d3s) / DT32 < 4.89. By the ratio range of the difference between the outer diameter and the inner diameter of the object side surface of the third spacer element to the effective radius of the image side surface of the third lens, it can be ensured that the optical path outside the effective diameter portion of the third lens can be completely blocked by the third spacer element, avoiding the generation of stray light, and at the same time preventing the influence on the performance caused by the eccentricity of the annulus width of the third spacer element in the lens barrel.

[0070] It should be noted that the annulus width of the spacer element specifically refers to the radial width of the spacer element.

[0071] In this embodiment, the inner diameter d3s of the object side surface of the third spacer element, the outer diameter D3s of the object side surface of the third spacer element, and the effective focal length f3 of the third lens satisfy 1.77 < (D3s - d3s) / f3 < 2.67. By controlling this condition, on the one hand, it is beneficial to prevent the third spacer element from being misaligned in the lens barrel, and on the other hand, it is beneficial to make the structural arrangement of the entire optical imaging device more compact, and make the total axial length of the optical imaging device smaller.

[0072] In this embodiment, the axial distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element on the optical axis satisfies -6.13 < f34 / EP34 < -2.11 with respect to the combined focal length f34 of the third lens and the fourth lens. By controlling this conditional expression, it can be ensured that the structural arrangement of the entire optical imaging device is more compact, and at the same time, the trend of the effective optical path in the entire optical system is smoother, reducing the sensitivity of the entire system.

[0073] In this embodiment, the inner diameter d1s of the object side surface of the first spacer element, the inner diameter d1m of the image side surface of the first spacer element, and the maximum axial thickness CP1 of the first spacer element satisfy: 0.60 < (d1s - d1m) / CP1 < 0.89. By controlling the difference between the inner diameters of the object side surface and the image side surface of the first spacer element, the inner ring surface on one side of the first spacer element facing the optical axis is inclined with respect to the optical axis, and there is a certain inclination angle between the two, so that the reflected stray light generated by the absorption of the light rays emitted from the first lens passing through the inner ring surface of the first spacer element is greatly reduced, which is beneficial to improving the imaging quality; through the maximum axial thickness of the first spacer element, the edge thicknesses of the first lens and the second lens on both sides thereof can be within a reasonable range, which is beneficial to ensuring that the axial thicknesses of the first lens and the second lens are more uniform, and is more conducive to molding and increasing the structural strength of the first lens and the second lens.

[0074] In this embodiment, the inner diameter d4m of the image side surface of the fourth spacer element, the outer diameter D4m of the image side surface of the fourth spacer element, and the radius of curvature of the image side surface of the fourth lens satisfy: 0.40 < (D4m - d4m) / R8 < 2.22. By controlling the ratio range of the difference between the outer diameter and the inner diameter of the image side surface of the fourth spacer element and the radius of curvature of the image side surface of the fourth lens, it can be ensured that the fourth spacer element can block the stray light generated by the mechanical part of the third lens. Combining with the radius of curvature of the image side surface of the fourth lens, a certain angle can be ensured when the effective optical path passes through the optical imaging device, and the size of the imaging surface can be ensured to meet the design requirements.

[0075] In this embodiment, the axial distance SAG22 between the intersection point of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens and the axial distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element on the optical axis satisfy: 4.99 < EP12 / |SAG22| < 9.28. By controlling the axial distance between the intersection point of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens, the effective radius of the second lens can be ensured to be within a reasonable range, so that the overall outer diameter of the second lens is maintained within a certain range, enabling the second lens to better play a connecting role when cooperating with the front and rear lenses. At the same time, by controlling the axial distance between the image side surface of the first spacer element and the object side surface of the second spacer element on the optical axis, it is also ensured that the edge axial thickness and the axial thickness of the effective diameter part of the second lens are basically the same, making the overall axial thickness of the second lens more uniform and more conducive to ensuring molding and structural strength.

[0076] In this embodiment, the radius of curvature R8 of the image side surface of the fourth lens, the effective focal length f4 of the fourth lens, the axial distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy: By controlling the effective focal length of the fourth lens and the central thickness of the fourth lens on the optical axis, on the one hand, it is to control the surface profiles of the object side and the image side of the fourth lens, improve the ghost images generated by the object side of the fourth lens, and on the other hand, ensure that the central thickness of the fourth lens on the optical axis cannot be too small. While improving the ghost images, the minimum forming condition of the central thickness needs to be satisfied to meet the manufacturing feasibility.

[0077] In this embodiment, the axial distance SAG12 between the intersection of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens satisfies 2.75 < EP01 / |SAG12| < 3.72 with the axial distance EP01 between the object side of the lens barrel and the object side of the first spacer element on the optical axis. By controlling the above conditions, on the one hand, it ensures the structural strength of the mechanical part of the first lens and the contact stability between the mechanical part of the first lens and the structure at the object side end of the lens barrel, and on the other hand, it avoids the risk of stray light generated when the light rays emitted from the object side of the first lens reach the image side and part of the effective optical path hits the mechanical part due to too large an angle.

[0078] In this embodiment, the maximum radius rd1 of the first lens and the maximum radial width z1 of the contact area between the image side of the first lens and the object side of the first spacer element satisfy 2.24 < rd1 / z1 < 4.10. By controlling this ratio range, it is beneficial to ensure that there is a sufficiently large contact area between the object side of the first lens and the lens barrel, and at the same time ensure that the contact area between the image side of the first lens and the object side of the first spacer element meets the requirements, thereby preventing the problem of tilting when the first lens and the first spacer element are assembled in the lens barrel.

[0079] In this embodiment, the inner diameter d4m of the image side of the fourth spacer element, the outer diameter D4m of the image side of the fourth spacer element and the effective radius DT51 of the object side of the fifth lens satisfy 0.85 < (D4m - d4m) / DT51 < 3.20. By controlling the difference between the outer diameter and the inner diameter of the image side of the fourth spacer element, the fourth spacer element can block the ineffective optical paths formed by reflection or scattering of the mechanical part of the fourth lens. At the same time, because the light rays are relatively steep when passing through the fourth lens, by controlling the effective radius of the object side of the fifth lens, it can ensure that the necking at the edge of the effective diameter part of the fifth lens meets the forming thickness requirements, making the fifth lens more conducive to forming and ensuring the overall stability of the optical imaging device.

[0080] In this embodiment, the image side surface of the first lens is concave; the object side surface of the second lens is convex, and the image side surface of the second lens is convex; the object side surface of the third lens is convex, and the image side surface of the third lens is convex; the object side surface of the fourth lens is concave, and the image side surface of the fourth lens is concave; the object side surface of the fifth lens is convex. By reasonably restricting the surface types of the respective lenses, it is beneficial to control the light path, ensure the smoothness of the light passing through each lens, ensure the imaging stability, and at the same time is beneficial to eliminating aberrations.

[0081] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0082] Optionally, the above optical imaging device may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0083] The optical imaging device in the present application may employ multiple lenses, such as the five lenses described above. In the present application, at least one of the mirror surfaces of the respective lenses is an aspherical mirror surface. The characteristics of an aspherical lens are that the curvature continuously changes 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 improving astigmatism aberration. After using an aspherical lens, it is possible to eliminate as much as possible the aberrations that occur during imaging, thereby improving the imaging quality.

[0084] However, those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging device can be changed to obtain the various results and advantages described in this specification. For example, although the five-lens example is described in the embodiment, the optical imaging device is not limited to including five lenses. If necessary, the optical imaging device may further include other numbers of lenses.

[0085] Figure 1 A dimension marking schematic diagram of an optical imaging device according to an alternative embodiment of the present invention is shown. Figure 1 The parameters of D0s, D1s, d1s, d1m, d3s, d4s, d4m, D4m, D3s, D0m, L, EP01, CP1, EP12, and EP34 are marked therein. Figure 2 Another dimension marking schematic diagram of an optical imaging device according to an alternative embodiment of the present invention is shown. Figure 2 The parameters of rd1, z1, DT32, DT41, DT51, SAG12, SAG22, and SAG32 are marked therein to clearly and intuitively understand the meaning of the parameters. For the convenience of describing the optical imaging device and the surface types of the specific lenses, these parameters will no longer be shown in the drawings when describing specific embodiments later.

[0086] The following further describes, with reference to the accompanying drawings, examples of the specific surface profiles and parameters of the optical imaging device applicable to the above-described embodiments.

[0087] It should be noted that any one of the following Examples 1 to 9 is applicable to all embodiments of the present application.

[0088] Example 1

[0089] As Figure 3 , Figures 6 to 8 shown, the optical imaging device of Example 1 is described. Figure 3 The schematic structural diagram of the optical imaging device of Example 1 is shown.

[0090] As Figure 3 shown, the optical imaging device includes a lens barrel P0 and, arranged in the lens barrel P0 in sequence from the object side to the image side along the optical axis of the lens barrel P0: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, and a fifth lens E5.

[0091] As Figure 3 shown, a first auxiliary spacer element in contact therewith is further provided on the image side of the first spacer element P1. The object side surface and the image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface of the first auxiliary spacer element. The image side surface of the first auxiliary spacer element is in contact with the object side surface S3 of the second lens. The object side surface and the image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens.

[0092] In summary, the parameters of the optical imaging device of Example 1 are as shown in Table 2, and the unit of the parameters in the table is millimeter (mm).

[0093] Table 2

[0094]

[0095] In Example 1, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a convex surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface. The object side surface S7 of the fourth lens is a concave surface, and the image side surface S8 of the fourth lens is a concave surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a concave surface.

[0096] In Embodiment 1, the effective focal length f of the optical imaging device is 0.51 mm, the effective focal length f1 of the first lens is -1.08 mm, the effective focal length f2 of the second lens is 1.29 mm, the effective focal length f3 of the third lens is 0.95 mm, the effective focal length f4 of the fourth lens is -0.56 mm, and the effective focal length f5 of the fifth lens is 0.90 mm.

[0097] Table 3 shows the basic structural parameter table of the optical imaging device in Embodiment 1, where the unit of the radius of curvature and the thickness / distance is millimeter (mm). In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, and the aperture stop is located between the first lens E1 and the second lens E2. S11 and S12 (not shown in the figure) can be the object side and the image side of the filter or the object side and the image side of the protective glass. S13 (not shown in the figure) is the imaging surface.

[0098] Table 3

[0099]

[0100] In Embodiment 1, the object side and the image side of the first lens E1 to the fifth lens E5 are both aspherical surfaces, and the surface profiles of the aspherical lenses can be defined by, but not limited to, the following aspherical formula:

[0101] Formula (1).

[0102] Where x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface is along the optical axis at a position with a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above; k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 4 below gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22 for each aspherical mirror surface S1 - S10 in Embodiment 1.

[0103] Table 4

[0104]

[0105] Figure 6 shows the axial chromatic aberration curve of the optical imaging device in Embodiment 1, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical imaging device. Figure 7 shows the astigmatism curve of the optical imaging device in Embodiment 1, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8 shows the lateral chromatic aberration curve of the optical imaging device in Embodiment 1, which represents the deviation of different image heights of light rays on the imaging surface after passing through the optical imaging device.

[0106] According to Figures 6 to 8 it can be known that the optical imaging device given in the first embodiment can achieve good imaging quality.

[0107] Second Embodiment

[0108] As Figure 4 shown, a schematic structural diagram of the optical imaging device of the second embodiment is shown.

[0109] As Figure 4 shown, the optical imaging device includes a lens barrel P0 and, arranged in the lens barrel P0 in sequence from the object side to the image side along the optical axis of the lens barrel P0: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, and a fifth lens E5.

[0110] As Figure 4 shown, a first auxiliary spacer element in contact therewith is further arranged on the image side of the first spacer element P1. The object side surface and the image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface of the first auxiliary spacer element, and the image side surface of the first auxiliary spacer element is in contact with the object side surface S3 of the second lens. The object side surface and the image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens.

[0111] In the second embodiment, the parameters such as the radius of curvature, central thickness, and effective focal length of the first lens to the fifth lens of the optical imaging device, as well as the spacing distance and high-order term coefficients between adjacent lenses, are the same as those in the first embodiment, but the parameters such as the axial thickness, inner diameter, and outer diameter of the lens barrel and the first spacer element to the fourth spacer element are different from those in the first embodiment. Therefore, the basic structural parameter table of the optical imaging device and the table of the high-order term coefficients of each aspherical surface can refer to the first embodiment.

[0112] In summary, the parameter reference table of the optical imaging device of the second embodiment is shown in Table 5, and the unit of the parameters in the table is millimeter (mm).

[0113] Table 5

[0114]

[0115] Third Embodiment

[0116] As Figure 5 shown, a schematic structural diagram of the optical imaging device of the third embodiment is shown.

[0117] As shown Figure 5 in FIG. 1, the optical imaging device includes a lens barrel P0 and the following components sequentially arranged in the lens barrel P0 along the optical axis from the object side to the image side: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, and a fifth lens E5.

[0118] As shown Figure 5 in FIG. 2, a first auxiliary spacer element in contact with the image side of the first spacer element P1 is further provided on the image side of the first spacer element P1. The object side surface and the image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface of the first auxiliary spacer element, and the image side surface of the first auxiliary spacer element is in contact with the object side surface S3 of the second lens. The object side surface and the image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens.

[0119] In the third embodiment, the parameters such as the radius of curvature, central thickness, effective focal length, etc. of the first lens to the fifth lens of the optical imaging device and the spacing distance and higher-order term coefficients between adjacent lenses are the same as those in the first embodiment, but the parameters such as the axial thickness, inner diameter, and outer diameter of the lens barrel, the first spacer element to the fourth spacer element are different from those in the first embodiment. Therefore, the basic structure parameter table of the optical imaging device and the table of the higher-order term coefficients of each aspherical surface can refer to the first embodiment.

[0120] In summary, the parameter reference table of the optical imaging device in the third embodiment is shown in Table 6, and the unit of the parameters in the table is millimeter (mm).

[0121] Table 6

[0122]

[0123] Embodiment 4

[0124] As shown Figure 9 in FIGS. 3 Figures 12 to 14 and 4, the optical imaging device of Embodiment 4 is described. Figure 9 FIG. 5 shows a schematic structural diagram of the optical imaging device of Embodiment 4.

[0125] As shown Figure 9As shown, the optical imaging device includes a lens barrel P0 and the following components sequentially arranged in the lens barrel P0 along the optical axis from the object side to the image side: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, and a fifth lens E5.

[0126] As Figure 9 shown, a first auxiliary spacer element is also provided on the image side of the first spacer element P1 in contact therewith. The object side surface and the image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface of the first auxiliary spacer element. The image side surface of the first auxiliary spacer element is in contact with the object side surface S3 of the second lens. The object side surface and the image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens.

[0127] In summary, the parameters of the optical imaging device in Embodiment 4 are as shown in Table 7, and the unit of the parameters in the table is millimeter (mm).

[0128] Table 7

[0129]

[0130] In Embodiment 4, the object side surface S1 of the first lens is concave, and the image side surface S2 of the first lens is concave. The object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is convex. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is concave. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex.

[0131] In Embodiment 4, the effective focal length f of the optical imaging device is 0.38 mm, the effective focal length f1 of the first lens is -0.76 mm, the effective focal length f2 of the second lens is 1.17 mm, the effective focal length f3 of the third lens is 0.97 mm, the effective focal length f4 of the fourth lens is -0.46 mm, and the effective focal length f5 of the fifth lens is 0.64 mm.

[0132] Table 8 shows the basic structural parameter table of the optical imaging device of Example 4. Among them, the unit of the radius of curvature and the thickness / distance is millimeter (mm). In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, and the aperture stop is located between the first lens E1 and the second lens E2. S11 and S12 (not shown in the figure) can be the object side and the image side of the filter or the object side and the image side of the protective glass. S13 (not shown in the figure) is the imaging surface.

[0133] Table 8

[0134]

[0135] Table 9 shows the high-order term coefficients of the aspherical surfaces that can be used in Example 4. Among them, each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0136] Table 9

[0137]

[0138] Figure 12 shows the axial chromatic aberration curve of the optical imaging device of Example 4, which represents the deviation of the focus points of light rays with different wavelengths after passing through the optical imaging device. Figure 13 shows the astigmatism curve of the optical imaging device of Example 4, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 14 shows the longitudinal chromatic aberration curve of the optical imaging device of Example 4, which represents the deviation of different image heights of light rays on the imaging surface after passing through the optical imaging device.

[0139] According to Figures 12 to 14 it can be known that the optical imaging device given in Example 4 can achieve good imaging quality.

[0140] Example 5

[0141] As Figure 10 shown, it shows the structural schematic diagram of the optical imaging device of Example 5.

[0142] As Figure 10 shown, the optical imaging device includes a lens barrel P0 and, arranged in the lens barrel P0 along the optical axis of the lens barrel P0 from the object side to the image side in sequence: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, and a fifth lens E5.

[0143] As Figure 10As shown, a first auxiliary spacer element in contact with the image side of the first spacer element P1 is further provided on the image side of the first spacer element P1. The object side and the image side of the first spacer element P1 are respectively in contact with the image side S2 of the first lens and the object side of the first auxiliary spacer element, and the image side of the first auxiliary spacer element is in contact with the object side S3 of the second lens. The object side and the image side of the second spacer element P2 are respectively in contact with the image side S4 of the second lens and the object side S5 of the third lens. The object side and the image side of the third spacer element P3 are respectively in contact with the image side S6 of the third lens and the object side S7 of the fourth lens. The object side and the image side of the fourth spacer element P4 are respectively in contact with the image side S8 of the fourth lens and the object side S9 of the fifth lens.

[0144] In the fifth embodiment, the parameters such as the radius of curvature, the central thickness, and the effective focal length of the first lens to the fifth lens of the optical imaging device, the distance between adjacent lenses, and the high-order term coefficients are the same as those in the fourth embodiment. However, the parameters such as the axial thickness, the inner diameter, and the outer diameter of the lens barrel, the first spacer element to the fourth spacer element are different from those in the fourth embodiment. Therefore, the basic structure parameter table of the optical imaging device and the table of the high-order term coefficients of each aspherical surface can refer to the fourth embodiment.

[0145] In summary, the parameter reference table of the optical imaging device in the fifth embodiment is shown in Table 10, and the unit of the parameters in the table is millimeter (mm).

[0146] Table 10

[0147]

[0148] Embodiment Six

[0149] As Figure 11 shown, a schematic structural diagram of the optical imaging device in the sixth embodiment is shown.

[0150] As Figure 11 shown, the optical imaging device includes a lens barrel P0 and, arranged in the lens barrel P0 in sequence from the object side to the image side along the optical axis of the lens barrel P0: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, and a fifth lens E5.

[0151] As Figure 11As shown in the figure, a first auxiliary spacer element in contact with the image side of the first spacer element P1 is further provided on the image side of the first spacer element P1. The object side and the image side of the first spacer element P1 are respectively in contact with the image side S2 of the first lens and the object side of the first auxiliary spacer element. The image side of the first auxiliary spacer element is in contact with the object side S3 of the second lens. The object side and the image side of the second spacer element P2 are respectively in contact with the image side S4 of the second lens and the object side S5 of the third lens. The object side and the image side of the third spacer element P3 are respectively in contact with the image side S6 of the third lens and the object side S7 of the fourth lens. The object side and the image side of the fourth spacer element P4 are respectively in contact with the image side S8 of the fourth lens and the object side S9 of the fifth lens.

[0152] In the sixth embodiment, the parameters such as the radius of curvature, the central thickness, the effective focal length, etc. of the first lens to the fifth lens of the optical imaging device, and the spacing distance and the high-order term coefficients between adjacent lenses are the same as those in the fourth embodiment. However, the parameters such as the axial thickness, the inner diameter, and the outer diameter of the lens barrel and the first spacer element to the fourth spacer element are different from those in the fourth embodiment. Therefore, the basic structure parameter table of the optical imaging device and the table of the high-order term coefficients of each aspherical surface can refer to the fourth embodiment.

[0153] In summary, the parameter reference table of the optical imaging device in the sixth embodiment is shown in Table 11, and the unit of the parameters in the table is millimeter (mm).

[0154] Table 11

[0155]

[0156] Embodiment Seven

[0157] As Figure 15 , Figures 18 to 20 shown, the optical imaging device of the seventh embodiment is described. Figure 15 Fig. shows a schematic structural diagram of the optical imaging device of the seventh embodiment.

[0158] As Figure 15 shown, the optical imaging device includes a lens barrel P0 and, arranged in the lens barrel P0 in sequence from the object side to the image side along the optical axis of the lens barrel P0: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, and a fifth lens E5.

[0159] As Figure 15As shown, the object side and the image side of the first spacer element P1 are in contact with the image side S2 of the first lens and the object side S3 of the second lens, respectively. The object side and the image side of the second spacer element P2 are in contact with the image side S4 of the second lens and the object side S5 of the third lens, respectively. The object side and the image side of the third spacer element P3 are in contact with the image side S6 of the third lens and the object side S7 of the fourth lens, respectively. The object side and the image side of the fourth spacer element P4 are in contact with the image side S8 of the fourth lens and the object side S9 of the fifth lens, respectively.

[0160] In summary, the parameters of the optical imaging device of Embodiment 7 are shown in Table 12, and the unit of the parameters in the table is millimeter (mm).

[0161] Table 12

[0162]

[0163] In Embodiment 7, the object side S1 of the first lens is concave, and the image side S2 of the first lens is concave. The object side S3 of the second lens is convex, and the image side S4 of the second lens is convex. The object side S5 of the third lens is convex, and the image side S6 of the third lens is convex. The object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is concave. The object side S9 of the fifth lens is convex, and the image side S10 of the fifth lens is concave.

[0164] In Embodiment 7, the effective focal length f of the optical imaging device is 0.78 mm, the effective focal length f1 of the first lens is -1.12 mm, the effective focal length f2 of the second lens is 1.31 mm, the effective focal length f3 of the third lens is 0.94 mm, the effective focal length f4 of the fourth lens is -0.58 mm, and the effective focal length f5 of the fifth lens is 1.00 mm.

[0165] Table 13 shows the basic structure parameter table of the optical imaging device of Embodiment 7, where the unit of the radius of curvature and the thickness / distance is millimeter (mm). In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, and the aperture stop is located between the first lens E1 and the second lens E2. S11 and S12 (not shown in the figure) can be the object side and the image side of the filter or the object side and the image side of the protective glass. S13 (not shown in the figure) is the imaging surface.

[0166] Table 13

[0167]

[0168] Table 14 shows the high-order term coefficients that can be used for each aspherical surface in Embodiment 7, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0169] Table 14

[0170]

[0171] Figure 18 The axial chromatic aberration curve of the optical imaging device of Embodiment 7 is shown, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical imaging device. Figure 19 The astigmatism curve of the optical imaging device of Embodiment 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 20 The longitudinal chromatic aberration curve of the optical imaging device of Embodiment 7 is shown, which represents the deviation of different image heights of light rays on the imaging plane after passing through the optical imaging device.

[0172] According to Figures 18 to 20 it can be known that the optical imaging device given in Embodiment 7 can achieve good imaging quality.

[0173] Embodiment 8

[0174] As Figure 16 shown, a schematic structural diagram of the optical imaging device of Embodiment 8 is shown.

[0175] As Figure 16 shown, the optical imaging device includes a lens barrel P0 and, arranged in the lens barrel P0 along the optical axis of the lens barrel P0 from the object side to the image side in sequence: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, and a fifth lens E5.

[0176] As Figure 16 shown, the object side surface and the image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and the image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens.

[0177] In Embodiment 8, the parameters such as the radius of curvature, the central thickness, and the effective focal length of the first lens to the fifth lens of the optical imaging device, as well as the spacing distance and the high-order term coefficients between adjacent lenses, are the same as those in Embodiment 7. However, the parameters such as the lens barrel, the axial thickness, the inner diameter, and the outer diameter of the first spacer element to the fourth spacer element are different from those in Embodiment 7. Therefore, the basic structural parameter table of the optical imaging device and the table of the high-order term coefficients of each aspherical surface can refer to Embodiment 7.

[0178] In summary, the parameters of the optical imaging device of the eighth embodiment are shown in Table 15, and the unit of the parameters in the table is millimeter (mm).

[0179] Table 15

[0180]

[0181] Ninth Embodiment

[0182] As Figure 17 shown, a schematic structural diagram of the optical imaging device of the ninth embodiment is shown.

[0183] As Figure 17 shown, the optical imaging device includes a lens barrel P0 and, arranged in the lens barrel P0 along the optical axis of the lens barrel P0 from the object side to the image side in sequence: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, and a fifth lens E5.

[0184] As Figure 17 shown, the object side surface and the image side surface of the first spacer element P1 are in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively. The object side surface and the image side surface of the second spacer element P2 are in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively. The object side surface and the image side surface of the third spacer element P3 are in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively. The object side surface and the image side surface of the fourth spacer element P4 are in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively.

[0185] In the ninth embodiment, the parameters such as the radius of curvature, central thickness, effective focal length, etc. of the first lens to the fifth lens of the optical imaging device and the spacing distance and higher-order term coefficients between adjacent lenses are the same as those of the seventh embodiment, but the parameters such as the axial thickness, inner diameter, and outer diameter of the lens barrel and the first spacer element to the fourth spacer element are different from those of the seventh embodiment. Therefore, the basic structural parameter table of the optical imaging device and the table of the higher-order term coefficients of each aspherical surface can refer to the seventh embodiment.

[0186] In summary, the parameters of the optical imaging device of the ninth embodiment are shown in Table 16, and the unit of the parameters in the table is millimeter (mm).

[0187] Table 16

[0188]

[0189] In summary, the first to ninth embodiments respectively satisfy the relationships shown in Table 17.

[0190] Table 17

[0191]

[0192] Table 18 shows the effective focal length of the optical imaging devices of Embodiment 1 to Embodiment 9, the effective focal lengths of each lens, and parameters such as SAG and DT. In the following table, Semi-FOV is half of the maximum field of view angle of the optical imaging device. It can be seen that half of the maximum field of view angle Semi-FOV of the optical imaging device of the present application satisfies: 66.00° ≤ Semi-FOV ≤ 72.00°.

[0193] Table 18

[0194]

[0195] The present application also provides an optical device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). The optical device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The optical device is equipped with the optical imaging device described above.

[0196] Obviously, the above-described embodiments are only some of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0197] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0198] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0199] The above are only the preferred embodiments of the present invention, and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging device, characterized in that: It includes a lens barrel, a lens group and a spacer element group assembled in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with negative optical power, and a fifth lens with positive optical power. There is an air gap between adjacent two of the first lens to the fifth lens on the optical axis of the optical imaging device. The spacer element group includes a first spacer element placed between the first lens and the second lens and in contact with the image side surface of the first lens. Among them, the following relationships are satisfied between the effective focal length f1 of the first lens and the effective focal length f of the optical imaging device: -2.18 < f1 / f < -1.40; the following relationship is satisfied between the air gap T12 between the first lens and the second lens on the optical axis and the maximum axial thickness CP1 of the first spacer element: 1.61 < T12 / CP1 < 2.22; the following relationship is satisfied between the outer diameter D1s of the object side surface of the first spacer element and the curvature radius R2 of the image side surface of the first lens: 3.50 < D1s / R2 < 5.

45.

2. The optical imaging device according to claim 1, characterized in that: The following relationship is satisfied between the interval distance EP01 on the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element and the central thickness CT1 of the first lens on the optical axis: 2.46 < EP01 / CT1 < 4.

95.

3. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens. The following relationship is satisfied between the inner diameter d4s of the object side surface of the fourth spacer element and the effective radius DT41 of the object side surface of the fourth lens: 2.34 < d4s / DT41 < 3.

31.

4. The optical imaging device according to claim 1, characterized in that: The following relationship is satisfied between the distance L on the optical axis from the object side surface of the lens barrel to the image side surface of the lens barrel, the outer diameter D0s of the object side surface of the lens barrel and the outer diameter D0m of the image side surface of the lens barrel: 2.46 < L / (D0m - D0s) < 2.

67.

5. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes a third spacer element placed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens. The following relationship is satisfied between the interval distance EP34 on the optical axis from the image side surface of the third spacer element to the object side surface of the fourth spacer element and the axial distance SAG32 between the intersection point of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens: 2.15 < EP34 / |SAG32| < 3.

15.

6. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes a third spacer element placed between the third lens and the fourth lens and in contact with the image side surface of the third lens. The following relationship is satisfied between the inner diameter d3s of the object side surface of the third spacer element, the outer diameter D3s of the object side surface of the third spacer element and the effective radius DT32 of the image side surface of the third lens: 3.41 < (D3s - d3s) / DT32 < 4.

89.

7. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens. An inner diameter d3s of the object side surface of the third spacing element, an outer diameter D3s of the object side surface of the third spacing element, and an effective focal length f3 of the third lens satisfy the following: 1.77<(D3s-d3s) / f3<2.

67.

8. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens. The spacing distance EP34 from the image side surface of the third spacing element to the object side surface of the fourth spacing element on the optical axis and the combined focal length f34 of the third lens and the fourth lens satisfy the following: -6.13 <f34 / EP34<-2.11。 9. The optical imaging device according to claim 1, characterized in that: An inner diameter d1s of the object-side surface of the first spacer element, an inner diameter d1m of the image-side surface of the first spacer element, and a maximum axial thickness CP1 of the first spacer element satisfy the following relationship: 0.60<(d1s-d1m) / CP1<0.

89.

10. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, The inner diameter d4m of the image side surface of the fourth spacer element, the outer diameter D4m of the image side surface of the fourth spacer element, and the curvature radius of the image side surface of the fourth lens satisfy: 0.40<(D4m-d4m) / R8<2.

22.

11. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, The on-axis distance SAG22 between the intersection of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens and the spacing distance EP12 from the image side surface of the first spacing element to the object side surface of the second spacing element on the optical axis satisfy: 4.99 <EP12 / |SAG22|<9.28。 12. The optical imaging device according to claim 1, characterized in that: The spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens. The curvature radius R8 of the image side surface of the fourth lens, the effective focal length f4 of the fourth lens, the spacing distance EP34 from the image side surface of the third spacing element to the object side surface of the fourth spacing element on the optical axis, and the center thickness CT4 of the fourth lens on the optical axis satisfy: .

13. The optical imaging device according to claim 1, characterized in that: The on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens and the spacing distance EP01 from the object side surface of the lens barrel to the object side surface of the first spacing element on the optical axis satisfy the following conditions: 2.75 <EP01 / |SAG12|<3.72。 14. The optical imaging device according to any one of claims 1 to 13, characterized in that: The maximum radius rd1 of the first lens and the maximum radial width z1 of the contact area between the image side surface of the first lens and the object side surface of the first spacing element satisfy: 2.24 <rd1 / z1<4.10。 15. The optical imaging device according to any one of claims 1 to 13, characterized in that: The spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, The inner diameter d4m of the image side surface of the fourth spacer element, the outer diameter D4m of the image side surface of the fourth spacer element, and the effective radius DT51 of the object side surface of the fifth lens satisfy the following: 0.85<(D4m-d4m) / DT51<3.20.

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