Optical imaging device

Abstract

The present invention provides an optical imaging device. 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. The spacer element group includes a first spacer element; it satisfies: -2.18 < f1 / f < -1.40; it satisfies: 1.61 < T12 / CP1 < 2.22; it satisfies: 3.50 < D1s / R2 < 5.45. The present invention solves the problem that in the prior art, for a five-piece optical imaging device, controlling the focal length and spacing of the front lens results in discrete defocus curves of the modulation transfer function and relatively low peaks.

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 clarity and contrast of imaging but also makes it difficult for the optical imaging device to obtain stable and high-quality images.

[0004] That is to say, there are 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. 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 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 disposed between the first lens and the second 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 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 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 and the center thickness CT1 of the first lens on the optical axis satisfy the following relationship: 2.46 <EP01 / CT1<4.95。

[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 surface of the fourth lens, and 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 the following relationship: 2.34 <d4s / DT41<3.31。

[0009] Furthermore, the distance L from the object side of the lens barrel to 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 the following relationship: 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 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, and a spacing 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 an 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 satisfy the following conditions: 2.15 <EP34 / |SAG32|<3.15。

[0011] Furthermore, the spacer element group also 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 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.

[0012] Furthermore, the spacer element group also 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 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.

[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, and a spacing 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 satisfies the following relationship with the combined focal length f34 of the third lens and the fourth lens: -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 the following relationship: 0.60<(d1s-d1m) / CP1<0.89.

[0015] Furthermore, the spacer element group also 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, and 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.

[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, and an on-axis distance SAG22 between an intersection of the image side surface of the second lens and the optical axis and a vertex of an effective radius of the image side surface of the second lens and a spacing 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 the following conditions: 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 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 spacer element to the object side surface of the fourth spacer element on the optical axis, and the center thickness CT4 of the fourth lens on the optical axis satisfy the following conditions: .

[0018] Furthermore, the on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis and the effective radius vertex of the image side surface of the first lens and the spacing distance EP01 on the optical axis from the object side surface of the lens barrel to the object side surface of the first spacing element meet the following conditions: 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 constrains that 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 light by 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, contribute to controlling the sensitivity of the image side surface of the first lens, ensure the effectiveness of light transmission, and be beneficial to improving the problems of dispersion 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. BRIEF 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 FIG2 shows a schematic structural diagram of an optical imaging device according to a first embodiment of the present invention;

[0026] Figure 4 A schematic structural diagram of an optical imaging device according to a second embodiment of the present invention is shown;

[0027] Figure 5 A schematic structural diagram of an optical imaging device according to a third embodiment of the present invention is shown;

[0028] Figure 6 shows an on-axis chromatic aberration curve of the optical imaging device of Example 1;

[0029] Figure 7 shows an astigmatism curve of the optical imaging device of Example 1;

[0030] Figure 8 shows a magnification chromatic aberration curve of the optical imaging device of Example 1;

[0031] Figure 9 A schematic structural diagram of an optical imaging device according to a fourth embodiment of the present invention is shown;

[0032] Figure 10 A schematic structural diagram of an optical imaging device according to a fifth embodiment of the present invention is shown;

[0033] Figure 11 FIG2 shows a schematic structural diagram of an optical imaging device according to a sixth embodiment of the present invention;

[0034] Figure 12 shows an on-axis chromatic aberration curve of the optical imaging device of Example 4;

[0035] Figure 13 shows the astigmatism curve of the optical imaging device of Example 4;

[0036] Figure 14 shows a magnification chromatic aberration curve of the optical imaging device of Example 4;

[0037] Figure 15 FIG2 shows a schematic structural diagram of an optical imaging device according to a seventh embodiment of the present invention;

[0038] Figure 16 FIG2 shows a schematic structural diagram of an optical imaging device according to an eighth embodiment of the present invention;

[0039] Figure 17 FIG2 shows a schematic structural diagram of an optical imaging device according to a ninth embodiment of the present invention;

[0040] Figure 18 shows an on-axis chromatic aberration curve of the optical imaging device of Example 7;

[0041] Figure 19 shows the astigmatism curve of the optical imaging device of Example 7;

[0042] Figure 20 shows a magnification chromatic aberration curve of the optical imaging device of Example 7;

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

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

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

[0046] The above drawings include the following reference numerals:

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

[0048] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0049] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0050] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0051] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0052] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0053] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it indicates that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it indicates that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to the judgment method commonly used by those skilled in the art, using the positive or negative R value (R refers to the radius of curvature of the paraxial region, typically the R value in the lens database in optical software) to determine whether it is convex or concave. For the object side, a positive R value indicates a convex surface, and a negative R value indicates a concave surface. For the image side, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0054] In this application, the object side refers to the side of the optical imaging device facing the object being photographed (not shown in the figure), and the image side refers to the side of the optical imaging device facing the imaging plane (not shown in the figure). Hereinafter, the object-side surface of a lens refers to the side of the lens facing the object being photographed (not shown in the figure), and the image-side surface of a lens refers to the side of the lens facing the imaging plane (not shown in the figure). In the structural diagrams shown in this application, the left side is the object side, and the right side is the image side.

[0055] In order to solve the problem in the prior art of a five-piece optical imaging device that controls the focal length and spacing of the front lenses, resulting in a discrete and low peak value of the modulation transfer function defocus curve, the present invention provides an optical imaging device.

[0056] like Figures 1 to 21As shown, in an optional embodiment of the present application, the optical imaging device includes a lens barrel, 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 to 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 and peak drop of the modulation transfer function defocus curve, so that the peak 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.

[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 The modulation transfer function defocus curve diagram when the optical imaging device of Scheme 1 of the present application satisfies D1s / R2 = 4.71 is shown, Figure 22 The modulation transfer function defocus curve graph when the optical imaging device of Comparative Example 1 satisfies D1s / R2 = 2.90 is shown, Figure 23 The modulation transfer function defocus curve graph 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 known from Figures 21 to 23 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] It can be seen from this 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 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 best 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 contacting the image side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and contacting the image side surface of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and contacting 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 CTI 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 can also ensure 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 extra 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 the light rays that are scattered, reflected, or absorbed inside the optical imaging device. Ineffective light rays can be caused by the physical limitations of 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 the generation of 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 sizes of the structures at the object side end and the image side end of the lens barrel can be controlled within a reasonable range, and while meeting the optical performance requirements, 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 can be made more uniform while meeting the molding requirements, minimizing the molding stress of the lens barrel.

[0068] In this embodiment, the axial 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. 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 and the image side of the third lens can be increased as much as possible to meet the molding requirements, making the axial thickness of the third lens as uniform as possible at positions other than the necking position.

[0069] In this embodiment, the inner diameter d3s of the object side of the third spacer element, 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. By the ratio range of the difference between the outer diameter and the inner diameter of the object side of the third spacer element and the effective radius of the image side 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 of the eccentricity of the annulus width of the third spacer element in the lens barrel on the performance.

[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 of the third spacer element, 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. 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, making the total axial length of the optical imaging device smaller.

[0072] In this embodiment, the axial 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 combined focal length f34 of the third lens and the fourth lens satisfy: -6.13 < f34 / EP34 < -2.11. By controlling this conditional formula, 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 light path passes through the optical imaging device, and the size of the imaging surface can meet the design requirements. [[ID=⑷]] [[ID=⑸]]

[0075] [[ID=⑹]]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 axial thickness of the edge of the second lens and the axial thickness of the effective diameter part are basically the same, making the overall axial thickness of the second lens more uniform, and more conducive to ensuring molding and structural strength. [[ID=⑺]] [[ID=⑻]]

[0076] [[ID=⑼]]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 shapes of the object side and the image side of the fourth lens, improve the ghost image 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 image, it is necessary to meet the minimum forming condition of the central thickness and satisfy 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. 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 of the structure between the mechanical part of the first lens and 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 invalid optical path 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; and the object-side surface of the fifth lens is convex. By properly constraining the surface shape of each lens, it is beneficial to control the direction of light, ensure the smoothness of light passing through each lens, ensure imaging stability, and help eliminate aberrations.

[0081] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0082] Optionally, the 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 use multiple lenses, such as the five lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0084] However, those skilled in the art will appreciate that the number of lenses comprising the optical imaging device can be varied to achieve the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although five lenses are described in the embodiments, the optical imaging device is not limited to including five lenses. If desired, the optical imaging device may also include other numbers of lenses.

[0085] Figure 1 A dimensionally marked schematic diagram of an optical imaging device according to an optional 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 indicated in the figure. Figure 2 Another dimensionally marked schematic diagram of an optical imaging device according to an optional embodiment of the present invention is shown. Figure 2 The parameters of rd1, z1, DT32, DT41, DT51, SAG12, SAG22, and SAG32 are marked in the figure to provide a clear and intuitive understanding of their significance. To facilitate the description of the optical imaging device and the specific lens surface shape, these parameters will no longer be reflected in the accompanying drawings when describing specific embodiments.

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

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

[0088] Example 1

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

[0090] like Figure 3 As shown, the optical imaging device includes a lens barrel P0 and, arranged in sequence from the object side to the image side along the optical axis of the lens barrel P0, the following lenses: 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] like Figure 3 As shown, the image side of the first spacer element P1 is further provided with a first auxiliary spacer element in contact therewith. The object-side surface and image-side surface of the first spacer element P1 are in contact with the image-side surface S2 of the first lens element and the object-side surface of the first auxiliary spacer element, respectively. The image-side surface of the first auxiliary spacer element is in contact with the object-side surface S3 of the second lens element. The object-side surface and image-side surface of the second spacer element P2 are in contact with the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object-side surface and image-side surface of the third spacer element P3 are in contact with the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, respectively. The object-side surface and image-side surface of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens element and the object-side surface S9 of the fifth lens element, respectively.

[0092] In summary, the parameters of the optical imaging device of Example 1 are shown in Table 2, where the units of the parameters are in millimeters (mm).

[0093] Table 2

[0094]

[0095] In Example 1, the object-side surface S1 of the first lens is convex, 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 concave.

[0096] In Example 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 parameters of the optical imaging device of Example 1, where the units for the radius of curvature and thickness / distance are all in millimeters. In the table below, OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, located between the first lens E1 and the second lens E2. S11 and S12 (not shown) can be the object-side and image-side surfaces of a filter or the object-side and image-side surfaces of a protective glass. S13 (not shown) represents the imaging surface.

[0098] Table 3

[0099]

[0100] In Example 1, the object-side surface and the image-side surface of the first lens E1 to the fifth lens E5 are all aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0101] Formula (1).

[0102] Where x is the distance vector from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R, i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above; k is the conic coefficient; and Ai is the correction coefficient for the i-th order of the aspheric surface. Table 4 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 that can be used for each aspheric mirror surface S1-S10 in Example 1.

[0103] Table 4

[0104]

[0105] Figure 6 The axial chromatic aberration curve of the optical imaging device of the first embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 7 The astigmatism curve of the optical imaging device of the first embodiment is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8 The chromatic aberration curve of the optical imaging device of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging device.

[0106] according to Figures 6 to 8 It can be seen that the optical imaging device provided in the first embodiment can achieve good imaging quality.

[0107] Example 2

[0108] like Figure 4 , which is a schematic structural diagram of the optical imaging device of Example 2.

[0109] like Figure 4 As shown, the optical imaging device includes a lens barrel P0 and, arranged in sequence from the object side to the image side along the optical axis of the lens barrel P0, the following lenses: 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] like Figure 4 As shown, the image side of the first spacer element P1 is further provided with a first auxiliary spacer element in contact therewith. The object-side surface and image-side surface of the first spacer element P1 are in contact with the image-side surface S2 of the first lens element and the object-side surface of the first auxiliary spacer element, respectively. The image-side surface of the first auxiliary spacer element is in contact with the object-side surface S3 of the second lens element. The object-side surface and image-side surface of the second spacer element P2 are in contact with the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object-side surface and image-side surface of the third spacer element P3 are in contact with the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, respectively. The object-side surface and image-side surface of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens element and the object-side surface S9 of the fifth lens element, respectively.

[0111] In Example 2, the parameters of the optical imaging device, such as the radius of curvature, center thickness, effective focal length, spacing between adjacent lenses, and higher-order coefficients, are the same as those in Example 1. However, the parameters of the lens barrel and the first to fourth spacing elements, such as the axial thickness, inner diameter, and outer diameter, differ from those in Example 1. Therefore, the table of basic structural parameters of the optical imaging device and the table of higher-order coefficients of various aspheric surfaces can be referenced to Example 1.

[0112] In summary, the parameters of the optical imaging device of the second embodiment are shown in Table 5, where the units of the parameters are in millimeters (mm).

[0113] Table 5

[0114]

[0115] Example 3

[0116] like Figure 5 , which shows a schematic structural diagram of the optical imaging device of Example 3.

[0117] like Figure 5 As shown, the optical imaging device includes a lens barrel P0 and, arranged in sequence from the object side to the image side along the optical axis of the lens barrel P0, the following lenses: 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] like Figure 5 As shown, the image side of the first spacer element P1 is further provided with a first auxiliary spacer element in contact therewith. The object-side surface and image-side surface of the first spacer element P1 are in contact with the image-side surface S2 of the first lens element and the object-side surface of the first auxiliary spacer element, respectively. The image-side surface of the first auxiliary spacer element is in contact with the object-side surface S3 of the second lens element. The object-side surface and image-side surface of the second spacer element P2 are in contact with the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object-side surface and image-side surface of the third spacer element P3 are in contact with the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, respectively. The object-side surface and image-side surface of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens element and the object-side surface S9 of the fifth lens element, respectively.

[0119] In Example 3, the parameters of the optical imaging device, such as the radius of curvature, center thickness, effective focal length, spacing between adjacent lenses, and higher-order coefficients, are the same as those in Example 1. However, the parameters of the lens barrel and the first to fourth spacing elements, such as the axial thickness, inner diameter, and outer diameter, differ from those in Example 1. Therefore, the table of basic structural parameters of the optical imaging device and the table of higher-order coefficients of each aspheric surface can be referenced to Example 1.

[0120] In summary, the parameters of the optical imaging device of the third embodiment are shown in Table 6, where the units of the parameters are in millimeters (mm).

[0121] Table 6

[0122]

[0123] Example 4

[0124] like Figure 9 、 Figures 12 to 14 As shown, the optical imaging device of embodiment 4 is described. Figure 9 A schematic structural diagram of an optical imaging device according to a fourth embodiment is shown.

[0125] like Figure 9As shown, the optical imaging device includes a lens barrel P0 and, arranged in sequence from the object side to the image side along the optical axis of the lens barrel P0, the following lenses: 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] like Figure 9 As shown, the image side of the first spacer element P1 is further provided with a first auxiliary spacer element in contact therewith. The object-side surface and image-side surface of the first spacer element P1 are in contact with the image-side surface S2 of the first lens element and the object-side surface of the first auxiliary spacer element, respectively. The image-side surface of the first auxiliary spacer element is in contact with the object-side surface S3 of the second lens element. The object-side surface and image-side surface of the second spacer element P2 are in contact with the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object-side surface and image-side surface of the third spacer element P3 are in contact with the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, respectively. The object-side surface and image-side surface of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens element and the object-side surface S9 of the fifth lens element, respectively.

[0127] In summary, the parameters of the optical imaging device of the fourth embodiment are shown in Table 7, where the units of the parameters are in millimeters (mm).

[0128] Table 7

[0129]

[0130] In Example 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 Example 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 parameters of the optical imaging device of Example 4, where the units for the radius of curvature and thickness / distance are all in millimeters. In the table below, OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, located between the first lens E1 and the second lens E2. S11 and S12 (not shown) can be the object-side and image-side surfaces of a filter or the object-side and image-side surfaces of a protective glass. S13 (not shown) represents the imaging surface.

[0133] Table 8

[0134]

[0135] Table 9 shows the high-order coefficients of each aspheric surface that can be used in the fourth embodiment, wherein the surface shape of each aspheric surface can be defined by the formula (1) given in the first embodiment.

[0136] Table 9

[0137]

[0138] Figure 12 An on-axis chromatic aberration curve of the optical imaging device of Example 4 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 13 The astigmatism curve of the optical imaging device of Example 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 14 A magnification chromatic aberration curve of the optical imaging device of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging device.

[0139] according to Figures 12 to 14 It can be seen that the optical imaging device provided in the fourth embodiment can achieve good imaging quality.

[0140] Example 5

[0141] like Figure 10 As shown, a structural schematic diagram of the optical imaging device of Example 5 is shown.

[0142] like Figure 10 As shown, the optical imaging device includes a lens barrel P0 and, arranged in sequence from the object side to the image side along the optical axis of the lens barrel P0, the following lenses: 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] like Figure 10As shown, the image side of the first spacer element P1 is further provided with a first auxiliary spacer element in contact therewith. The object-side surface and image-side surface of the first spacer element P1 are in contact with the image-side surface S2 of the first lens element and the object-side surface of the first auxiliary spacer element, respectively. The image-side surface of the first auxiliary spacer element is in contact with the object-side surface S3 of the second lens element. The object-side surface and image-side surface of the second spacer element P2 are in contact with the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object-side surface and image-side surface of the third spacer element P3 are in contact with the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, respectively. The object-side surface and image-side surface of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens element and the object-side surface S9 of the fifth lens element, respectively.

[0144] In Example 5, the parameters of the optical imaging device, such as the radius of curvature, center thickness, effective focal length, and spacing between adjacent lenses, as well as the higher-order coefficients, are the same as those in Example 4. However, the parameters of the lens barrel and the first to fourth spacing elements, such as the axial thickness, inner diameter, and outer diameter, differ from those in Example 4. Therefore, the table of basic structural parameters of the optical imaging device and the table of higher-order coefficients of various aspheric surfaces can be referenced to Example 4.

[0145] In summary, the parameters of the optical imaging device of the fifth embodiment are shown in Table 10, where the units of the parameters are in millimeters (mm).

[0146] Table 10

[0147]

[0148] Example 6

[0149] like Figure 11 As shown, a structural schematic diagram of the optical imaging device of Example 6 is shown.

[0150] like Figure 11 As shown, the optical imaging device includes a lens barrel P0 and, arranged in sequence from the object side to the image side along the optical axis of the lens barrel P0, the following lenses: 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] like Figure 11As shown, the image side of the first spacer element P1 is further provided with a first auxiliary spacer element in contact therewith. The object-side surface and image-side surface of the first spacer element P1 are in contact with the image-side surface S2 of the first lens element and the object-side surface of the first auxiliary spacer element, respectively. The image-side surface of the first auxiliary spacer element is in contact with the object-side surface S3 of the second lens element. The object-side surface and image-side surface of the second spacer element P2 are in contact with the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object-side surface and image-side surface of the third spacer element P3 are in contact with the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, respectively. The object-side surface and image-side surface of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens element and the object-side surface S9 of the fifth lens element, respectively.

[0152] In Example 6, the parameters of the optical imaging device, such as the radius of curvature, center thickness, effective focal length, and spacing between adjacent lenses, as well as the higher-order coefficients, are the same as those in Example 4. However, the parameters of the lens barrel and the first to fourth spacing elements, such as the axial thickness, inner diameter, and outer diameter, differ from those in Example 4. Therefore, the table of basic structural parameters of the optical imaging device and the table of higher-order coefficients of various aspheric surfaces can be referenced to Example 4.

[0153] In summary, the parameters of the optical imaging device of Example 6 are shown in Table 11, where the units of the parameters are in millimeters (mm).

[0154] Table 11

[0155]

[0156] Example 7

[0157] like Figure 15 、 Figures 18 to 20 As shown, the optical imaging device of embodiment 7 is described. Figure 15 A schematic structural diagram of the optical imaging device of Example 7 is shown.

[0158] like Figure 15 As shown, the optical imaging device includes a lens barrel P0 and, arranged in sequence from the object side to the image side along the optical axis of the lens barrel P0, the following lenses: 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] like Figure 15As shown, the object-side surface and 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 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 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 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.

[0160] In summary, the parameters of the optical imaging device of Example 7 are shown in Table 12, where the units of the parameters are in millimeters (mm).

[0161] Table 12

[0162]

[0163] In Example 7, 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 concave.

[0164] In Example 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 structural parameters of the optical imaging device of Example 7, where the units for the radius of curvature and thickness / distance are all in millimeters. In the table below, OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, located between the first lens E1 and the second lens E2. S11 and S12 (not shown) can be the object-side and image-side surfaces of a filter or the object-side and image-side surfaces of a protective glass. S13 (not shown) represents the imaging surface.

[0166] Table 13

[0167]

[0168] Table 14 shows the high-order coefficients of each aspheric surface that can be used in Example 7, wherein the surface shape of each aspheric surface can be defined by the formula (1) given in the above-mentioned Example 1.

[0169] Table 14

[0170]

[0171] Figure 18 An on-axis chromatic aberration curve of the optical imaging device of Example 7 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 19 The astigmatism curve of the optical imaging device of Example 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 20 The magnification chromatic aberration curve of the optical imaging device of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging device.

[0172] according to Figures 18 to 20 It can be seen that the optical imaging device provided in the seventh embodiment can achieve good imaging quality.

[0173] Example 8

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

[0175] like Figure 16 As shown, the optical imaging device includes a lens barrel P0 and, arranged in sequence from the object side to the image side along the optical axis of the lens barrel P0, the following lenses: 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] like Figure 16 As shown, the object-side surface and 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 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 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 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.

[0177] In Example 8, the parameters of the optical imaging device, such as the radius of curvature, center thickness, effective focal length, spacing between adjacent lenses, and higher-order coefficients, are the same as those in Example 7. However, the parameters of the lens barrel and the first to fourth spacing elements, such as the axial thickness, inner diameter, and outer diameter, differ from those in Example 7. Therefore, the table of basic structural parameters of the optical imaging device and the table of higher-order coefficients of various aspheric surfaces can be referenced to Example 7.

[0178] In summary, the parameters of the optical imaging device of Example 8 are shown in Table 15, where the units of the parameters are in millimeters (mm).

[0179] Table 15

[0180]

[0181] Embodiment 9

[0182] like Figure 17 , which is a schematic structural diagram of the optical imaging device of Example 9.

[0183] like Figure 17 As shown, the optical imaging device includes a lens barrel P0 and, arranged in sequence from the object side to the image side along the optical axis of the lens barrel P0, the following lenses: 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] like Figure 17 As shown, the object-side surface and 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 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 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 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 Example 9, the parameters of the optical imaging device, such as the radius of curvature, center thickness, effective focal length, spacing between adjacent lenses, and higher-order coefficients, are the same as those in Example 7. However, the parameters of the lens barrel and the first to fourth spacing elements, such as the axial thickness, inner diameter, and outer diameter, differ from those in Example 7. Therefore, the table of basic structural parameters of the optical imaging device and the table of higher-order coefficients of various aspheric surfaces can be referenced to Example 7.

[0186] In summary, the parameters of the optical imaging device of Example 9 are shown in Table 16, where the units of the parameters are in millimeters (mm).

[0187] Table 16

[0188]

[0189] In summary, Examples 1 to 9 respectively satisfy the relationships shown in Table 17.

[0190] Table 17

[0191]

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

[0193] Table 18

[0194]

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

[0196] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[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, tasks, devices, components and / or combinations thereof.

[0198] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0199] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection 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 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 contacting 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, wherein: The following relationship is satisfied between the spacer distance EP01 from the object side surface of the lens barrel to the object side surface of the first spacer element on the optical axis 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, wherein: The spacer element group further includes a fourth spacer element placed between the fourth lens and the fifth lens and contacting 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, wherein: The following relationship is satisfied between the distance L from the object side surface of the lens barrel to the image side surface of the lens barrel on the optical axis, 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, wherein: The spacer element group further includes a third spacer element placed between the third lens and the fourth lens and contacting the image side surface of the third lens, and a fourth spacer element placed between the fourth lens and the fifth lens and contacting the image side surface of the fourth lens. The following relationship is satisfied between the spacer distance EP34 from the image side surface of the third spacer element to the object side surface of the fourth spacer element on the optical axis 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, wherein: The spacer element group further includes a third spacer element placed between the third lens and the fourth lens and contacting 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, wherein: 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 spacer element, an outer diameter D3s of the object-side surface of the third spacer 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, wherein: 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 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 combined focal length f34 of the third lens and the fourth lens satisfy the following conditions: -6.13 <f34 / EP34<-2.11。 9. The optical imaging device according to claim 1, wherein: 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 the following relationship: 0.60<(d1s-d1m) / CP1<0.

89.

10. The optical imaging device according to claim 1, wherein: 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 the following relationship: 0.40<(D4m-d4m) / R8<2.

22.

11. The optical imaging device according to claim 1, wherein: 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 and 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 spacer element to the object side surface of the second spacer element on the optical axis satisfy: 4.99 <EP12 / |SAG22|<9.28。 12. The optical imaging device according to claim 1, wherein: 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 spacer element to the object side surface of the fourth spacer element on the optical axis, and the center thickness CT4 of the fourth lens on the optical axis satisfy the following conditions: .

13. The optical imaging device according to claim 1, wherein: The on-axis distance SAG12 between the intersection of the image side surface of the first lens and the optical axis and 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 spacer 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.

Images