Optical imaging device

Abstract

The invention discloses an optical imaging device, the optical imaging device comprises a lens barrel, and a lens group and a spacing element group which are arranged in the lens barrel, and the lens group sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an image side along an optical axis, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; a third lens; a fourth lens; and a fifth lens; the spacing element group comprises a first spacing element which is arranged between the first lens and the second lens and is at least partially contacted with the first lens; and the optical imaging device satisfies:-7.0 lt; f2 / f1 * (R3 / R2) lt; -5.8, 2.0 lt,-5.8, 2.0 lt; d1s / R2lt; and 2.8.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and specifically, to an optical imaging device. Background Art

[0002] With the improvement of people's living quality, the demand for various portable communication devices has also increased. For example, consumers have higher and higher requirements for the imaging quality of optical lenses in portable communication devices and the appearance of the lenses. In terms of designers and manufacturers, especially for mobile phones, laptops, and tablet products, the screen-to-body ratio of the display screen is also required to be higher and higher.

[0003] However, due to the relatively large size of some parts of the first lens and / or the second lens in the optical lens in the related art, the front-end size of the lens is too large, or the requirements for the MTF curve dispersion and peak value cannot be met, resulting in poor imaging effect of such an optical lens, that is, the requirements for its forming size and imaging quality in the market cannot be met simultaneously. Summary of the Invention

[0004] The first aspect of the present application provides such an optical imaging device, which includes: a lens barrel, and a lens group and a spacer element group disposed in the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens with a negative optical power, whose image side is concave; a second lens with a positive optical power, whose object side is convex and the image side is convex; a third lens; a fourth lens; and a fifth lens; the spacer element group includes a first spacer element disposed between the first lens and the second lens and at least partially in contact with the first lens; and the optical imaging device satisfies: -7.0 < f2 / f1 * (R3 / R2) < -5.8, 2.0 < d1s / R2 < 2.8, where d1s is the inner diameter of the object side of the first spacer element perpendicular to the plane of the optical axis, R2 is the radius of curvature of the image side of the first lens, R3 is the radius of curvature of the object side of the second lens, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0005] The inventors of the present application have found that the front-end size of the optical imaging device in the related art is too large. One of the reasons is that the radius of curvature value of at least one side surface of the first lens and / or the second lens is large. And even for the optical imaging device in the related art that solves the problem of large front-end size, it still cannot meet the requirements for the MTF curve dispersion and peak value, resulting in poor imaging effect of such an imaging device. By restricting the effective focal lengths of the first lens and the second lens and the radii of curvature of the image side surface of the first lens and the object side surface of the second lens within a certain range, the effective diameter sizes of the first lens and the second lens can be significantly reduced, so that the front-end size of the optical imaging device can be made as small as possible. On this premise, by controlling the ratio between the inner diameter of the plane perpendicular to the optical axis of the object side surface of the first spacer element and the radius of curvature of the image side surface of the first lens within a certain range, the problems of low MTF curve dispersion and peak value can be improved simultaneously. In summary, the optical imaging device provided by the embodiments of the present application not only meets the requirements for the forming size, but also ensures the MTF curve, so that the imaging requirements can be met.

[0006] The second aspect of the present application provides such an optical imaging device, which includes: a lens barrel and a lens group and a spacer element group disposed in the lens barrel. Among them, the lens group includes, in order from the object side to the image side along the optical axis: a first lens with a negative optical power, whose image side surface is concave; a second lens with a positive optical power, whose object side surface is convex and image side surface is convex; a third lens; a fourth lens; and a fifth lens; the spacer element group includes a first spacer element disposed between the first lens and the second lens and at least partially in contact with the first lens; and the optical imaging device satisfies: 1.6 < T12 / CP1 < 2.2, where CP1 is the maximum thickness of the first spacer element along the optical axis, and T12 is the spacing distance between the first lens and the second lens along the optical axis.

[0007] The third aspect of the present application provides such an optical imaging device, which includes: a lens barrel and a lens group and a spacer element group disposed in the lens barrel. Among them, the lens group includes, in order from the object side to the image side along the optical axis: a first lens with a negative optical power, whose image side surface is concave; a second lens with a positive optical power, whose object side surface is convex and image side surface is convex; a third lens; a fourth lens; and a fifth lens; the spacer element group includes a first spacer element disposed between the first lens and the second lens and at least partially in contact with the first lens; and the optical imaging device satisfies: -3.7 < d0m / R10 < 0.37, where d0s is the inner diameter of the plane perpendicular to the optical axis of the object side surface of the lens barrel, and R10 is the radius of curvature of the image side surface of the fifth lens.

[0008] In one embodiment, the optical imaging device satisfies: 1.6 < T12 / CP1 < 2.2, where CP1 is the maximum thickness of the first spacer element along the optical axis, and T12 is the spacing distance between the first lens and the second lens along the optical axis.

[0009] In one embodiment, the optical imaging device satisfies: the optical imaging device satisfies: -3.7 < d0m / R10 < 0.37, where d0s is the inner diameter of the object side surface of the lens barrel in a plane perpendicular to the optical axis, and R10 is the curvature radius of the image side surface of the fifth lens.

[0010] In one embodiment, the optical imaging device satisfies: the spacer element group further includes a third spacer element disposed between the third lens and the fourth lens, and a fourth spacer element disposed between the fourth lens and the fifth lens, and the optical imaging device satisfies: 8.0 < EP34 / T34 < 13.7, where EP34 is the spacing distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis, and T34 is the spacing distance between the third lens and the fourth lens along the optical axis.

[0011] In one embodiment, the optical imaging device satisfies: the spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens, and the optical imaging device satisfies: 8.52 < D4m / R9*(D4s / R8) < 27.6, where D4s is the outer diameter of the object side surface of the fourth spacer element in a plane perpendicular to the optical axis, D4m is the outer diameter of the image side surface of the fourth spacer element in a plane perpendicular to the optical axis, R8 is the curvature radius of the image side surface of the fourth lens, and R9 is the curvature radius of the object side surface of the fifth lens.

[0012] In one embodiment, the optical imaging device satisfies: the spacer element group further includes a third spacer element disposed between the third lens and the fourth lens, and the optical imaging device satisfies: 1.95 < (d3s + d3m) / f3 < 2.16, where d3s is the inner diameter of the object side surface of the third spacer element in a plane perpendicular to the optical axis, d3m is the outer diameter of the image side surface of the third spacer element in a plane perpendicular to the optical axis, and f3 is the effective focal length of the third lens.

[0013] In one embodiment, the optical imaging device satisfies: the spacer element group further includes a second spacer element disposed between the second lens and the third lens, and a third spacer element disposed between the third lens and the fourth lens, and the optical imaging device satisfies: 1.75 < f23 / EP23 < 2.50, where f23 is the combined focal length of the second lens and the third lens, and EP23 is the spacing distance between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis.

[0014] In one embodiment, the optical imaging device satisfies that the spacer element group further includes a third spacer element disposed between the third lens and the fourth lens, and the optical imaging device satisfies 1.7 < (D3s - d3s) / d3s < 2.2, where d3s is the inner diameter of the object side surface of the third spacer element in a plane perpendicular to the optical axis, and D3s is the outer diameter of the object side surface of the third spacer element in a plane perpendicular to the optical axis.

[0015] In one embodiment, the optical imaging device satisfies that the spacer element group further includes a second spacer element disposed between the second lens and the third lens, and a third spacer element disposed between the third lens and the fourth lens, and the optical imaging device satisfies 7.4 < D3s / EP23 < 11.5, where EP23 is the axial spacing distance between the image side surface of the second spacer element and the object side surface of the third spacer element, and D3s is the outer diameter of the object side surface of the third spacer element in a plane perpendicular to the optical axis.

[0016] In one embodiment, the optical imaging device satisfies that the spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens, and the optical imaging device satisfies 0.20 < R8 / (d4s + D4s) < 0.42, where d4s is the inner diameter of the object side surface of the fourth spacer element in a plane perpendicular to the optical axis, D4s is the outer diameter of the object side surface of the fourth spacer element in a plane perpendicular to the optical axis, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0017] In one embodiment, the optical imaging device satisfies that the spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens, and the optical imaging device satisfies 0.4 < DT51 / d4s < 0.6, where DT51 is the maximum effective radius of the object side surface of the fifth lens, and d4s is the inner diameter of the object side surface of the fourth spacer element in a plane perpendicular to the optical axis.

[0018] In one embodiment, the optical imaging device satisfies that the spacer element group further includes a third spacer element disposed between the third lens and the fourth lens, and the optical imaging device satisfies 3.40 < (D3m - d3m) / DT32 < 4.35, where d3m is the inner diameter of the image side surface of the third spacer element in a plane perpendicular to the optical axis, D3m is the outer diameter of the image side surface of the third spacer element in a plane perpendicular to the optical axis, and DT32 is the maximum effective radius of the image side surface of the third lens.

[0019] In one embodiment, the optical imaging device satisfies 3.55 < (D1m - d1m) / CP1 < 5.95, where d1m is the inner diameter of the image side surface of the first spacer element in a plane perpendicular to the optical axis, D1m is the outer diameter of the image side surface of the first spacer element in a plane perpendicular to the optical axis, and CP1 is the maximum thickness of the first spacer element in the axial direction.

[0020] In one embodiment, the optical imaging device satisfies that the spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens, and the optical imaging device satisfies: -1.70 < f34 / d4s < -0.75, where f34 is the combined focal length of the third lens and the fourth lens, and d4s is the inner diameter of the object side surface of the fourth spacer element in a plane perpendicular to the optical axis.

[0021] In one embodiment, the optical imaging device satisfies that the spacer element group further includes a second spacer element disposed between the second lens and the third lens, and the optical imaging device satisfies: -1.0 < D1s / f1 + D2s / f2 < 0.2, where D1s is the outer diameter of the object side surface of the first spacer element in a plane perpendicular to the optical axis, D2s is the outer diameter of the object side surface of the second spacer element in a plane perpendicular to the optical axis, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0022] In one embodiment, the optical imaging device satisfies that the spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and a fourth spacer element disposed between the fourth lens and the fifth lens, and the optical imaging device satisfies: 0.15 < (d4m - d3m) / R8 < 0.95, where d3m is the inner diameter of the image side surface of the third spacer element in a plane perpendicular to the optical axis, d4m is the inner diameter of the image side surface of the fourth spacer element in a plane perpendicular to the optical axis, and R8 is the radius of curvature of the image side surface of the fourth lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects, and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0024] Figure 1 The structural layout diagram of the optical imaging device according to an embodiment of the present application and a schematic diagram of some parameters are shown;

[0025] Figure 2A The schematic diagram of the MTF curve of the optical imaging device satisfying -7.0 < f2 / f1*(R3 / R2) < -5.8 and d1s / R2 = 2.5 according to an embodiment of the present application is shown; Figure 2B The schematic diagram of the MTF curve of the optical imaging device satisfying -7.0 < f2 / f1*(R3 / R2) < -5.8 and d1s / R2 = 1.6 according to an embodiment of the present application is shown; Figure 2C The schematic diagram of the MTF curve of the optical imaging device satisfying -7.0 < f2 / f1*(R3 / R2) < -5.8 and d1s / R2 = 3.5 according to an embodiment of the present application is shown;

[0026] Figure 3AShows a schematic structural diagram of an optical imaging device according to Embodiment 1 of the present application;

[0027] Figure 3B Shows a schematic structural diagram of an optical imaging device according to Embodiment 2 of the present application;

[0028] Figure 3C Shows a schematic structural diagram of an optical imaging device according to Embodiment 3 of the present application;

[0029] Figures 4A to 4C Respectively show schematic diagrams of the axial chromatic aberration curve, astigmatism curve, and longitudinal chromatic aberration curve of the optical imaging devices according to Embodiment 1, Embodiment 2, and Embodiment 3 of the present application;

[0030] Figure 5A Shows a schematic structural diagram of an optical imaging device according to Embodiment 4 of the present application;

[0031] Figure 5B Shows a schematic structural diagram of an optical imaging device according to Embodiment 5 of the present application;

[0032] Figure 5C Shows a schematic structural diagram of an optical imaging device according to Embodiment 6 of the present application;

[0033] Figures 6A to 6C Respectively show schematic diagrams of the axial chromatic aberration curve, astigmatism curve, and longitudinal chromatic aberration curve of the optical imaging devices according to Embodiment 4, Embodiment 5, and Embodiment 6 of the present application;

[0034] Figure 7A Shows a schematic structural diagram of an optical imaging device according to Embodiment 7 of the present application;

[0035] Figure 7B Shows a schematic structural diagram of an optical imaging device according to Embodiment 8 of the present application;

[0036] Figure 7C Shows a schematic structural diagram of an optical imaging device according to Embodiment 9 of the present application; and

[0037] Figures 8A to 8C Respectively show schematic diagrams of the axial chromatic aberration curve, astigmatism curve, and longitudinal chromatic aberration curve of the optical imaging devices according to Embodiment 7, Embodiment 8, and Embodiment 9 of the present application. Detailed implementation manners

[0038] To better understand the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] It should be noted that in this specification, the expressions such as 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.

[0040] In the drawings, for the sake of clarity, the thickness, dimensions, 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 for illustrative purposes only and are not drawn to an exact scale.

[0041] In this document, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens that is closer to the object being photographed is called the object side surface of the lens, and the surface of each lens that is closer to the imaging surface is called the image side surface of the lens.

[0042] It should also be understood that the terms "comprises", "comprising", "has", "including", and / or "including having", when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features, rather than modifying an individual element in the list. In addition, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0043] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0044] 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 following embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, and these all belong to the protection scope of the present application. For example, the lens group, the lens barrel, and the spacer elements in the embodiments of the present application can be arbitrarily combined, and it is not limited that the lens group in one embodiment can only be combined with the lens barrel, spacer elements, etc. of this embodiment.

[0045] The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments. Figure 1 The structural layout diagram of the optical imaging device according to the embodiment of the present application and the schematic diagram of some parameters are shown. As Figure 1 shown, the optical imaging device according to the exemplary embodiment of the present application includes a lens barrel, and a lens group and a spacer element group disposed in the lens barrel. Among them, the lens barrel may include an object-side end face, an image-side end face, an outer ring face, and an inner ring face. The inner ring face may be stepped. For example, the inner diameter of the lens barrel may gradually increase from the object side to the image side. The lens group may include five lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. These five lenses are arranged in sequence along the optical axis from the object side to the image side. There may be a spacing distance between any two adjacent lenses among the first lens to the fifth lens.

[0046] In the exemplary embodiment, the first lens may have a negative optical power, and the image side face may be a concave face.

[0047] In the exemplary embodiment, the second lens may have a positive optical power, its object side face may be a convex face, and its image side face may be a convex face.

[0048] In the exemplary embodiment, the third lens may have a positive optical power, its object side face may be a convex face, and its image side face may be a convex face.

[0049] In the exemplary embodiment, the fourth lens may have a negative optical power, its object side face may be a concave face, and its image side face may be a concave face.

[0050] In the exemplary embodiment, the fifth lens may have a positive optical power, and its image side face may be a convex face.

[0051] In an exemplary embodiment, the spacer element group of the optical imaging device may include at least one of a first spacer element, a second spacer element, a third spacer element, and a fourth spacer element. The first spacer element is placed between the first lens and the second lens, and may be in at least partial contact with the first lens. The second spacer element may be arranged between the second lens and the third lens. The third spacer element may be arranged between the third lens and the fourth lens. The fourth spacer element may be arranged between the fourth lens and the fifth lens. Moreover, at least one of the first spacer element, the second spacer element, the third spacer element, the fourth spacer element, and the fifth spacer element may be in contact with the inner wall of the lens barrel, and at least one may be in at least partial contact with any lens. It should be understood that the present application does not specifically limit the number of spacer elements, and any number of spacer elements may be included between any two lenses, and the entire optical imaging device may also include any number of spacer elements.

[0052] It should be understood by those skilled in the art that some lens parameters commonly used in the art (such as the distance T12 between the first lens and the second lens along the optical axis) are not specified in the present invention. Figure 1 As shown in Figure 1 Only some parameters of the lens barrel and the spacer element of an optical imaging device of the present application are shown as examples to facilitate a better understanding of the present application. Figure 1 As shown, D2s is the outer diameter of the object side surface of the second spacer element perpendicular to the optical axis, D1m is the outer diameter of the image side surface of the first spacer element perpendicular to the optical axis, D1s is the outer diameter of the object side surface of the first spacer element perpendicular to the optical axis, d1s is the inner diameter of the object side surface of the first spacer element perpendicular to the optical axis, d1m is the inner diameter of the image side surface of the first spacer element perpendicular to the optical axis, CP1 is the maximum thickness of the first spacer element along the optical axis, EP23 is the spacing distance between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis, EP34 is the spacing distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis, and DT32 is the image side surface of the third lens. d3s is the inner diameter of the plane of the object side surface of the third spacing element perpendicular to the optical axis, d3m is the inner diameter of the plane of the image side surface of the third spacing element perpendicular to the optical axis, d4s is the inner diameter of the plane of the object side surface of the fourth spacing element perpendicular to the optical axis, d4m is the inner diameter of the plane of the image side surface of the fourth spacing element perpendicular to the optical axis, D4s is the outer diameter of the plane of the object side surface of the fourth spacing element perpendicular to the optical axis, D4m is the outer diameter of the plane of the image side surface of the fourth spacing element perpendicular to the optical axis, D3m is the outer diameter of the plane of the image side surface of the third spacing element perpendicular to the optical axis.

[0053] In an exemplary embodiment, the optical imaging device satisfies: -7.0 < f2 / f1 * (R3 / R2) < -5.8, 2.0 < d1s / R2 < 2.8, where d1s is the inner diameter of the object side surface of the first spacer element in a plane perpendicular to the optical axis, R2 is the radius of curvature of the image side surface of the first lens, R3 is the radius of curvature of the object side surface of the second lens, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens. The inventors of the present application have found that the front-end size of the optical imaging device in the related art is too large. One of the reasons is that the radius of curvature value of at least one side surface of the first lens and / or the second lens is relatively large. Moreover, even for the optical imaging device in the related art that has solved the problem of the large front-end size, it still cannot meet the requirements for the MTF curve dispersion and peak value, resulting in poor imaging effects of such an imaging device. However, the optical imaging device that satisfies the above conditional formula can significantly reduce the effective diameter sizes of the first lens and the second lens by restricting the effective focal lengths of the first lens and the second lens and the radii of curvature of the image side surface of the first lens and the object side surface of the second lens within a certain range, so that the front-end size of the optical imaging device can be made as small as possible. On this premise, by controlling the ratio between the inner diameter of the object side surface of the first spacer element in a plane perpendicular to the optical axis and the radius of curvature of the image side surface of the first lens within a certain range, the problems of MTF curve dispersion and low peak value can be improved simultaneously. That is, the optical imaging device that satisfies the above conditions not only meets the requirements for the forming size but also ensures the MTF curve, thus meeting the imaging requirements.

[0054] Figure 2A The schematic diagram of the MTF curve of the optical imaging device satisfying -7.0 < f2 / f1 * (R3 / R2) < -5.8 and d1s / R2 = 2.5 according to an embodiment of the present application is shown. As Figure 2A shown, the MTF curves of the optical imaging devices satisfying the conditional formula -7.0 < f2 / f1 * (R3 / R2) < -5.8 and 2.0 < d1s / R2 < 2.8 are relatively concentrated, and the peak values of most fields of view are relatively high, with low optical sensitivity. Figure 2B The schematic diagram of the MTF curve of the optical imaging device satisfying -7.0 < f2 / f1 * (R3 / R2) < -5.8 and d1s / R2 = 1.6 according to an embodiment of the present application is shown. As Figure 2BAs shown, the light rays of the second lens of the optical imaging device with a value of d1s / R2 lower than the lower limit of the conditional expression 2.0 < d1s / R2 < 2.8 become steeper, resulting in a larger overall field curvature, a lower overall field of view peak value, and increased sensitivity to eccentricity and tilt. More specifically, if the value of d1s / R2 being lower than the lower limit of the conditional expression 2.0 < d1s / R2 < 2.8 is caused by too small an inner diameter dimension of the object side surface of the first spacer element perpendicular to the optical axis plane, then the overall field of view peak value of such an optical imaging device is lower; if the value of d1s / R2 being lower than the lower limit of the conditional expression 2.0 < d1s / R2 < 2.8 is caused by too large a curvature radius of the image side surface of the first lens, then when optimizing the second lens, it will cause the edge field of view to become steeper, the overall field curvature to be larger, and the sensitivity to eccentricity and tilt to increase during molding. Figure 2C FIG. shows a schematic diagram of the MTF curve of an optical imaging device satisfying -7.0 < f2 / f1*(R3 / R2) < -5.8 and d1s / R2 = 3.5 according to an embodiment of the present application, as Figure 2C As shown, for an optical imaging device with a value of d1s / R2 higher than the upper limit of the conditional expression 2.0 < d1s / R2 < 2.8, the field curvature is biased, and the peak values of most of the MTF curves are low. More specifically, if the value of d1s / R2 being higher than the upper limit of the conditional expression 2.0 < d1s / R2 < 2.8 is caused by too large an inner diameter dimension of the object side surface of the first spacer element perpendicular to the optical axis plane, then the overall field of view peak value of such an optical imaging device is higher, resulting in a biased field curvature and low peak values for most of the MTF curves; if the value of d1s / R2 being higher than the upper limit of the conditional expression 2.0 < d1s / R2 < 2.8 is caused by too small a curvature radius of the image side surface of the first lens, then when optimizing the second lens, it will cause the near optical axis field of view to become steeper, and the sensitivity to eccentricity and tilt will also increase during molding. Among them, Figures 2A to 2C the field of view one in is 0F, the field of view two is 0.5F, and the field of view three is 1.0F.

[0055] In an exemplary embodiment, the optical imaging device satisfies: 1.6 < T12 / CP1 < 2.2, where CP1 is the maximum thickness of the first spacer element along the optical axis, and T12 is the spacing distance between the first lens and the second lens along the optical axis. By making the optical imaging device satisfy the above conditions and controlling the maximum thickness of the first spacer element along the optical axis and the spacing distance between the first lens and the second lens (such as an air gap) along the optical axis, the edge thicknesses of the first lens and the second lens can be better controlled within a reasonable range, making the overall thickness uniformity of the two lenses better and being more conducive to lens molding.

[0056] In an exemplary embodiment, the optical imaging device satisfies: -3.7 < d0m / R10 < 0.37, where d0m is the inner diameter of the plane perpendicular to the optical axis on the image side of the lens barrel, and R10 is the radius of curvature of the image side of the fifth lens. By making the optical imaging device satisfy the above conditions and controlling the inner diameter of the plane perpendicular to the optical axis on the object side of the lens barrel and the radius of curvature of the image side of the fifth lens, a reserved position for the dispensing space of the glue dots between the fifth lens and the inner wall of the lens barrel can be structurally provided during the assembly of the optical imaging device, thereby ensuring that the reliability requirements such as the push-off force of the optical imaging device can be achieved. Furthermore, the optical imaging device can block excess light in terms of performance, reduce the generation of stray light, and improve the imaging quality.

[0057] In an exemplary embodiment, the optical imaging device satisfies: 8.0 < EP34 / T34 < 13.7, where EP34 is the distance along the optical axis between the image side of the third spacer element and the object side of the fourth spacer element, and T34 is the distance along the optical axis between the third lens and the fourth lens. In the exemplary embodiment, it is beneficial to ensure the lens molding and meet the need for stray light improvement. By controlling the distance along the optical axis between the third lens and the fourth lens, it helps to control the edge thickness of the third lens, thereby reducing the difficulty of molding the third lens.

[0058] In an exemplary embodiment, the optical imaging device satisfies: 8.52 < D4m / R9*(D4s / R8) < 27.6, where D4s is the outer diameter of the plane perpendicular to the optical axis on the object side of the fourth spacer element, D4m is the outer diameter of the plane perpendicular to the optical axis on the image side of the fourth spacer element, R8 is the radius of curvature of the image side of the fourth lens, and R9 is the radius of curvature of the object side of the fifth lens. By making the optical imaging device satisfy the above conditions, it can ensure that the divergent light passing through the fourth lens shows a certain converging trend when finally exiting the optical imaging device under the correction of the radius of curvature of the object side of the fifth lens, so that as many effective light rays as possible can be received by the chip, ensuring the imaging quality.

[0059] In an exemplary embodiment, the optical imaging device satisfies: 1.95 < (d3s + d3m) / f3 < 2.16, where d3s is the inner diameter of the plane perpendicular to the optical axis on the object side of the third spacer element, d3m is the inner diameter of the plane perpendicular to the optical axis on the image side of the third spacer element, and f3 is the effective focal length of the third lens. By making the optical imaging device satisfy the above conditions and controlling the inner diameters of the planes perpendicular to the optical axis on the object side and the image side of the third spacer element, the excess light generated by passing through the second lens and internal reflection in the second lens can be effectively blocked, the generation of stray light can be reduced, and thus the imaging quality can be improved.

[0060] In an exemplary embodiment, the optical imaging device satisfies: 1.75 < f23 / EP23 < 2.50, where f23 is the combined focal length of the second lens and the third lens, and EP23 is the axial distance between the image side of the second spacer element and the object side of the third spacer element. By making the optical imaging device satisfy the above conditions, the overall length of the optical imaging device can be reduced, thereby achieving the goal of minimization.

[0061] In an exemplary embodiment, the optical imaging device satisfies: 1.7 < (D3s - d3s) / d3s < 2.2, where d3s is the inner diameter of the object side plane of the third spacer element perpendicular to the optical axis, and D3s is the outer diameter of the object side plane of the third spacer element perpendicular to the optical axis. By making the optical imaging device satisfy the above conditions and controlling the inner diameter and outer diameter of the object side plane of the third spacer element perpendicular to the optical axis, on the one hand, the phenomenon of misalignment during the assembly of the third spacer element into the lens barrel can be avoided; on the other hand, the stray light generated outside the effective diameters of the front and rear lenses of the third spacer element can be improved, thereby improving the imaging quality.

[0062] In an exemplary embodiment, the optical imaging device satisfies: 7.4 < D3s / EP23 < 11.5, where EP23 is the axial distance between the image side of the second spacer element and the object side of the third spacer element, and D3s is the outer diameter of the object side plane of the third spacer element perpendicular to the optical axis. By making the optical imaging device satisfy the above conditional formula, the size of the edge thickness of the lens between the second spacer element and the third spacer element can be better controlled, so that the requirement for the minimum edge thickness of the third lens can be met, making it easier to process and form.

[0063] In an exemplary embodiment, the optical imaging device satisfies: 0.20 < R8 / (d4s + D4s) < 0.42, where d4s is the inner diameter of the object side plane of the fourth spacer element perpendicular to the optical axis, D4s is the outer diameter of the object side plane of the fourth spacer element perpendicular to the optical axis, and R8 is the radius of curvature of the image side of the fourth lens. By making the optical imaging device satisfy the above conditional formula and controlling the inner diameter and outer diameter of the object side plane of the fourth spacer element perpendicular to the optical axis, on the one hand, the fourth spacer element can be prevented from shifting during assembly; on the other hand, the excess light generated by the lenses on the object side of the fourth spacer element (such as the first lens to the fourth lens) can be blocked and the stray light can be improved, thereby improving the imaging quality.

[0064] In an exemplary embodiment, the optical imaging device satisfies: 0.4 < DT51 / d4s < 0.6, where DT51 is the maximum effective radius of the object side surface of the fifth lens, and d4s is the inner diameter of the object side surface of the fourth spacer element in a plane perpendicular to the optical axis. By making the optical imaging device satisfy the above conditional formula, it can be ensured that the fourth spacer element can block the excess light outside the effective diameter of the lens without blocking the effective light path of the fifth lens, preventing the generation of stray light.

[0065] In an exemplary embodiment, the optical imaging device satisfies: 3.40 < (D3m - d3m) / DT32 < 4.35, where d3m is the inner diameter of the image side surface of the third spacer element in a plane perpendicular to the optical axis, D3m is the outer diameter of the image side surface of the third spacer element in a plane perpendicular to the optical axis, and DT32 is the maximum effective radius of the image side surface of the third lens. By making the optical imaging device satisfy the above conditional formula, all the effective light paths passing through the third lens can be transmitted to the next lens along a certain angle, thereby realizing the miniaturization of the optical system.

[0066] In an exemplary embodiment, the optical imaging device satisfies: 3.55 < (D1m - d1m) / CP1 < 5.95, where d1m is the inner diameter of the image side surface of the first spacer element in a plane perpendicular to the optical axis, D1m is the outer diameter of the image side surface of the first spacer element in a plane perpendicular to the optical axis, and CP1 is the maximum thickness of the first spacer element along the optical axis direction. By making the optical imaging device satisfy the above conditional formula, on the one hand, the stray light caused by the reflection at the edge of the effective diameter of the image side surface of the second lens can be improved; on the other hand, by controlling the maximum thickness of the first spacer element, the edge thicknesses of the lenses on both sides of the first spacer element can be ensured to be within a reasonable range, facilitating the lens forming.

[0067] In an exemplary embodiment, the optical imaging device satisfies: -1.70 < f34 / d4s < -0.75, where f34 is the combined focal length of the third lens and the fourth lens, and d4s is the inner diameter of the object side surface of the fourth spacer element in a plane perpendicular to the optical axis. By making the optical imaging device satisfy the above condition, the optical path direction of the light passing through the third and fourth lenses can be ensured, so that while realizing the miniaturization of the optical imaging device, when the optical path passes through the last lens (such as the fifth lens), the imaging surface can be maximized.

[0068] In an exemplary embodiment, the optical imaging device satisfies: -1.0 < D1s / f1 + D2s / f2 < 0.2, where D1s is the outer diameter of the object side surface of the first spacer element in a plane perpendicular to the optical axis, D2s is the outer diameter of the object side surface of the second spacer element in a plane perpendicular to the optical axis, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens. By making the optical imaging device satisfy the above conditions, while ensuring the additivity of the first lens and the second lens, the ghost image generated by the second lens can be effectively improved, which is beneficial to the improvement of the overall stray light quality of the optical imaging device.

[0069] In an exemplary embodiment, the optical imaging device satisfies: 0.15 < (d4m - d3m) / R8 < 0.95, where d3m is the inner diameter of the image side surface of the third spacer element in a plane perpendicular to the optical axis, d4m is the inner diameter of the image side surface of the fourth spacer element in a plane perpendicular to the optical axis, and R8 is the radius of curvature of the image side surface of the fourth lens. By making the optical imaging device satisfy the above conditions and controlling the lenses on both sides of the third spacer element and the fourth spacer element, the length of the entire optical imaging device can be effectively reduced, and the light angle of the edge field of view can be within a reasonable range, thereby effectively reducing the sensitivity of the system, which is beneficial to improving the peak value (such as the peak value of the MTF curve) of the optical imaging device.

[0070] In an embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the sixth 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. 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 radius of curvature characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side surfaces and image side surfaces of all the lenses among the first lens, the third lens, the fourth lens, and the fifth lens are aspherical mirror surfaces.

[0071] In an exemplary embodiment, the above optical imaging device may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The light from the object sequentially passes through the surfaces of the optical lens group to the filter and / or the protective glass and finally forms an image on the imaging surface.

[0072] The optical imaging device according to the above-described embodiment of the present application may employ multiple lenses, such as the five lenses described above. By reasonably distributing the optical power, surface shape of each lens, and the arrangement of each spacer element, etc., the span of each gear in the cooperation between the lens and the lens barrel is relatively uniform, enhancing the ability to converge light and improving the imaging quality of a wide-angle, large image plane optical imaging device. 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 six lenses are described as an example 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.

[0073] The following further describes specific embodiments of the optical imaging device applicable to the above-described embodiment with reference to the accompanying drawings.

[0074] Example 1

[0075] Figure 3A FIG. shows a schematic structural diagram of an optical imaging device 1001 according to Embodiment 1 of the present application. As Figure 3A shown, the optical imaging device 1001 includes a lens barrel P0, a lens group E1 to E5, and a spacer element group P1 to P4. The optical imaging device 1001 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens.

[0076] As Figure 3A shown, the lens group of the optical imaging device 1001 includes, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. Among them, the object side surface S1 of the first lens E1 is a convex surface, and the image side surface S2 is a concave surface. The object side surface S3 of the second lens E2 is a convex surface, and the image side surface S4 is a convex surface. The object side surface S5 of the third lens E3 is a convex surface, and the image side surface S6 is a convex surface. The object side surface S7 of the fourth lens E4 is a concave surface, and the image side surface S8 is a concave surface. The object side surface S9 of the fifth lens E5 is a convex surface, and the image side surface S10 is a concave surface. The optical imaging device 1001 further includes a filter (not shown) for correcting color deviation, and the filter has an object side surface S11 (not shown) and an image side surface S12 (not shown). Light from an object sequentially passes through each surface S1 to S12 and finally forms an image on an imaging surface S13 (not shown).

[0077] Table 1 shows a basic parameter table of the lens group of the optical imaging device 1001 in Embodiment 1, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0078] Table 1

[0079]

[0080]

[0081] In Embodiment 1, the object side and the image side of the first lens E1, the third lens E3, the fourth lens E4, and the fifth lens E5 are both aspherical surfaces. The surface profiles of the respective aspherical lenses can be defined by, but are not limited to, the following aspherical formula:

[0082]

[0083] where x is the sagitta, the distance from the vertex of the aspherical surface to the aspherical surface along the optical axis at a position with a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface. Tables 2-1 and 2-2 give the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 .

[0084] Table 2-1

[0085] Face number A4 A6 A8 A10 A12 S1 2.3611E-01 -5.6480E-01 -9.1535E-01 1.4254E+01 -6.1480E+01 S2 1.0140E+00 -1.3069E+01 2.1337E+02 -2.0661E+03 1.1271E+04 S5 -6.1547E-02 -9.1952E-01 -1.3214E+00 1.4748E+01 -1.7603E+02 S6 -1.5348E+00 5.9590E+01 -7.7460E+02 6.1601E+03 -3.2185E+04 S7 -5.6371E+00 2.6141E+02 -4.7397E+03 5.8592E+04 -5.1140E+05 S8 -9.5097E+00 1.9721E+02 -2.5834E+03 2.3998E+04 -1.5785E+05 S9 -4.9569E+00 4.4178E+01 -2.7993E+02 1.2511E+03 -3.8877E+03 S10 -1.3969E-02 -3.9086E+00 4.3926E+01 -2.6444E+02 9.8120E+02

[0086] Table 2-2

[0087] Face number A14 A16 A18 A20 A22 S1 1.4669E+02 -2.0497E+02 1.5682E+02 -5.0786E+01 0.0000E+00 S2 -2.9479E+04 1.4725E+04 5.2179E+04 0.0000E+00 0.0000E+00 S5 6.7411E+02 -1.0646E+03 0.0000E+00 0.0000E+00 0.0000E+00 S6 1.1193E+05 -2.5164E+05 3.3214E+05 -1.9564E+05 0.0000E+00 S7 3.1339E+06 -1.3101E+07 3.5423E+07 -5.5689E+07 3.8634E+07 S8 7.2640E+05 -2.2785E+06 4.6301E+06 -5.4880E+06 2.8798E+06 S9 8.3149E+03 -1.1972E+04 1.1061E+04 -5.9119E+03 1.3871E+03 S10 -2.3235E+03 3.5227E+03 -3.3111E+03 1.7556E+03 -4.0108E+02

[0088] As Figure 3A shown, the optical imaging device 1001 further includes four spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, and a fourth spacer element P4. Among them, the first spacer element P1 is disposed between the first lens E1 and the second lens E2 and is at least partially in contact with the first lens E1; the second spacer element P2 is disposed between the second lens E2 and the third lens E3; the third spacer element P3 is disposed between the third lens E3 and the fourth lens E4; and the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5. Moreover, the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, and the fifth spacer element P5 are in contact with the inner wall of the lens barrel P0. Table 3 shows the basic parameter table of the spacer elements P1 to P4 and the lens barrel P0 of the optical imaging device 1001. The units of the respective parameters in Table 3 are all millimeters (mm). The above-mentioned spacer elements can block external redundant light from entering, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging device 1001.

[0089] Table 3

[0090] Parameter d1s d1m D1s D1m D2s d3s d3m D3s D3m Value 1.274 0.986 2.197 2.397 2.84 1.016 1.016 2.94 2.94 Parameter d4s d4m D4s D4m d0m CP1 EP23 [[ID=5 ​ 1.538 1.864 2.694 2.872 3.672 0.343 0.337 0.426

[0091] ​

[0092] ​ The structural schematic diagram of the optical imaging device 1002 according to Embodiment 2 of the present application is shown. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted.

[0093] As ​ shown, the optical imaging device 1002 includes a lens barrel P0, a lens group E1 - E5, and a spacer element group P1 - P4. The optical imaging device 1002 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens. The lens group of the optical imaging device 1002 is exactly the same as that of the optical imaging device 1001 in Embodiment 1, and its basic parameters are shown in Tables 1 to 2-2 in detail, which will not be elaborated here. Table 4 shows the basic parameter tables of the spacer elements P1 - P4 and the lens barrel P0 of the optical imaging device 1001.

[0094] Table 4

[0095] ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.266 1 2.079 2.237 2.68 1.016 1.016 2.78 2.78 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.512 1.928 2.573 2.678 3.512 0.333 0.374 0.406

[0096] ​

[0097] ​ The structural schematic diagram of the optical imaging device 1003 according to Embodiment 3 of the present application is shown. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted.

[0098] As ​ shown, the optical imaging device 1003 includes a lens barrel P0, a lens group E1 - E5, and a spacer element group P1 - P4. The optical imaging device 1003 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens. The lens group of the optical imaging device 1003 is exactly the same as that of the optical imaging device 1001 in Embodiment 1, and its basic parameters are shown in Tables 1 to 2-2 in detail, which will not be elaborated here. Table 5 shows the basic parameter tables of the spacer elements P1 - P4 and the lens barrel P0 of the optical imaging device 1001.

[0099] Table 5

[0100] ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.215 0.986 2.51 2.597 3.04 1.016 1.016 3.14 3.14 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.479 1.864 2.844 3.072 3.776 0.273 0.3 0.481

[0101] ​ The axial chromatic aberration curves of the optical imaging device 1001 in Embodiment 1, the optical imaging device 1002 in Embodiment 2, and the optical imaging device 1003 in Embodiment 3 are shown.​ The astigmatism curves of the optical imaging device 1001 of Embodiment 1, the optical imaging device 1002 of Embodiment 2, and the optical imaging device 1003 of Embodiment 3 are shown. ​ The longitudinal chromatic aberration curves of the optical imaging device 1001 of Embodiment 1, the optical imaging device 1002 of Embodiment 2, and the optical imaging device 1003 of Embodiment 3 are shown. According to ​ It can be seen that the optical imaging devices 1001, 1002, and 1003 given in Embodiment 1, Embodiment 2, and Embodiment 3 can achieve good imaging quality.

[0102] ​

[0103] ​ The schematic structural diagram of the optical imaging device 2001 according to Embodiment 4 of the present application is shown. As ​ shown, the optical imaging device 2001 includes a lens barrel P0, a lens group E1 to E5, and a spacer element group P1 to P4. The optical imaging device 2001 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens.

[0104] As ​ shown, the lens group of the optical imaging device 2001 sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. Among them, the object side surface S1 of the first lens E1 is concave, and the image side surface S2 is concave. The object side surface S3 of the second lens E2 is convex, and the image side surface S4 is convex. The object side surface S5 of the third lens E3 is convex, and the image side surface S6 is convex. The object side surface S7 of the fourth lens E4 is concave, and the image side surface S8 is concave. The object side surface S9 of the fifth lens E5 is convex, and the image side surface S10 is convex. The optical imaging device 2001 further includes a filter (not shown) for correcting color deviation, and the filter has an object side surface S11 (not shown) and an image side surface S12 (not shown). The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface S13 (not shown).

[0105] Table 6 shows the basic parameter table of the lens group of the optical imaging device 2001 of Embodiment 4, where the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm). Tables 7-1 and 7-2 show the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 4, and each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0106] Table 6

[0107]

[0108] Table 7-1

[0109] ​ A4 A6 A8 A10 A12 S1 1.0804E+00 -5.3709E+00 2.3934E+01 -7.9834E+01 1.8486E+02 S2 1.6508E+00 -1.6724E+01 2.5957E+02 -2.8905E+03 2.0112E+04 S5 1.4474E-02 -5.6814E+00 8.1819E+01 -8.2912E+02 4.6530E+03 S6 -1.2485E+00 2.2342E+01 1.2958E+02 -5.9090E+03 6.7699E+04 S7 -4.6213E+00 1.9763E+02 -3.1811E+03 3.6488E+04 -3.1891E+05 S8 -1.1099E+01 2.5065E+02 -3.6014E+03 3.7256E+04 -2.7786E+05 S9 -7.7950E+00 9.4930E+01 -8.6226E+02 5.7534E+03 -2.7525E+04 S10 -5.7823E-01 -4.4583E-01 1.2647E+01 -2.6194E+01 -2.8398E+02

[0110] Table 7-2

[0111]

[0112]

[0113] As ​ shown, the optical imaging device 2001 further includes four spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, and a fourth spacer element P4. Among them, the first spacer element P1 is disposed between the first lens E1 and the second lens E2 and is at least partially in contact with the first lens E1; the second spacer element P2 is disposed between the second lens E2 and the third lens E3; the third spacer element P3 is disposed between the third lens E3 and the fourth lens E4; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5. And, the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, and the fifth spacer element P5 are in contact with the inner wall of the lens barrel P0. Table 8 shows the basic parameter table of the spacer elements P1 to P4 of the optical imaging device 2001 and the lens barrel P0. The unit of each parameter in Table 8 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lens and the lens barrel to be better supported, and enhance the structural stability of the optical imaging device 2001.

[0114] Table 8

[0115] ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.274 1.036 2.197 2.4 2.84 0.971 0.971 2.94 2.94 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.538 1.863 2.694 2.872 3.672 0.31 0.33 0.419

[0116] ​

[0117] ​ shows a schematic structural diagram of the optical imaging device 2002 according to Embodiment 5 of the present application. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 4 will be omitted.

[0118] As ​ shown, the optical imaging device 2002 includes a lens barrel P0, a lens group E1 to E5, and a spacer element group P1 to P4. The optical imaging device 2002 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens. The lens group of the optical imaging device 2002 is exactly the same as the lens group of the optical imaging device 2001 in Embodiment 4. The basic parameters thereof are shown in detail in Tables 6 to 7-2 and will not be elaborated here. Table 9 shows the basic parameter table of the spacer elements P1 to P4 of the optical imaging device 2001 and the lens barrel P0.

[0119] Table 9

[0120] ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.468 1.013 2.143 2.28 2.72 0.971 0.971 2.82 2.82 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.538 1.863 2.595 2.752 3.552 0.352 0.309 0.469

[0121] ​

[0122] ​ The structural schematic diagram of the optical imaging device 2003 according to Embodiment 6 of the present application is shown. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 4 will be omitted.

[0123] As ​ shown, the optical imaging device 2003 includes a lens barrel P0, lens groups E1 to E5, and spacer element groups P1 to P4. The optical imaging device 2003 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens. The lens groups of the optical imaging device 2003 are exactly the same as those of the optical imaging device 2001 in Embodiment 4, and the basic parameters are shown in Tables 6 to 7-2 in detail and will not be elaborated here. Table 10 shows the basic parameter tables of the spacer elements P1 to P4 and the lens barrel P0 of the optical imaging device 2001.

[0124] Table 10

[0125] ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.367 1.013 2.188 2.12 2.56 0.971 0.971 2.66 2.66 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.207 1.207 2.86 2.86 3.392 0.273 0.283 0.53

[0126] ​ The axial chromatic aberration curves of the optical imaging device 2001 in Embodiment 4, the optical imaging device 2002 in Embodiment 5, and the optical imaging device 2003 in Embodiment 6 are shown. ​ The astigmatism curves of the optical imaging device 2001 in Embodiment 4, the optical imaging device 2002 in Embodiment 5, and the optical imaging device 2003 in Embodiment 6 are shown. ​ The longitudinal chromatic aberration curves of the optical imaging device 2001 in Embodiment 4, the optical imaging device 2002 in Embodiment 5, and the optical imaging device 2003 in Embodiment 6 are shown. According to ​ it can be known that the optical imaging devices 2001, 2002, and 2003 given in Embodiment 4, Embodiment 5, and Embodiment 6 can achieve good imaging quality.

[0127] ​

[0128] ​ The structural schematic diagram of the optical imaging device 3001 according to Embodiment 7 of the present application is shown. As ​ shown, the optical imaging device 3001 includes a lens barrel P0, lens groups E1 to E5, and spacer element groups P1 to P4. The optical imaging device 3001 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens.

[0129] As​ As shown, the lens group of the optical imaging device 3001 sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. Among them, the object side surface S1 of the first lens E1 is a concave surface, and the image side surface S2 is a concave surface. The object side surface S3 of the second lens E2 is a convex surface, and the image side surface S4 is a convex surface. The object side surface S5 of the third lens E3 is a convex surface, and the image side surface S6 is a convex surface. The object side surface S7 of the fourth lens E4 is a concave surface, and the image side surface S8 is a concave surface. The object side surface S9 of the fifth lens E5 is a convex surface, and the image side surface S10 is a convex surface. The optical imaging device 3001 further includes a filter (not shown) for correcting color deviation, and the filter has an object side surface S11 (not shown) and an image side surface S12 (not shown). Light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface S13 (not shown).

[0130] Table 11 shows the basic parameter table of the lens group of the optical imaging device 3001 in Embodiment 7. Among them, the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm). Tables 12-1 and 12-2 show the high-order term coefficients that can be used for each aspherical mirror surface in Embodiment 7. Among them, each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0131] Table 11

[0132]

[0133] Table 12-1

[0134]

[0135]

[0136] Table 12-2

[0137] ​ A14 A16 A18 A20 A22 S1 -1.2339E+03 1.8539E+03 -1.6048E+03 6.0579E+02 0.0000E+00 S2 -1.7493E+05 5.0963E+05 -6.4445E+05 0.0000E+00 0.0000E+00 S5 -1.0356E+04 1.1057E+04 0.0000E+00 0.0000E+00 0.0000E+00 S6 -2.1739E+05 7.4876E+05 -1.3871E+06 1.0742E+06 0.0000E+00 S7 1.6907E+06 -7.5939E+06 2.2672E+07 -3.9946E+07 3.1250E+07 S8 1.4309E+06 -5.0474E+06 1.1568E+07 -1.5467E+07 9.1291E+06 S9 1.4482E+05 -3.3977E+05 5.1572E+05 -4.5574E+05 1.7765E+05 S10 -1.9794E+04 5.2211E+04 -8.8494E+04 8.7318E+04 -3.8080E+04

[0138] As ​As shown, the optical imaging device 3001 further includes four spacer elements, namely a first spacer element P1, a second spacer element P2, a third spacer element P3, and a fourth spacer element P4. Among them, the first spacer element P1 is disposed between the first lens E1 and the second lens E2 and is at least partially in contact with the first lens E1; the second spacer element P2 is disposed between the second lens E2 and the third lens E3; the third spacer element P3 is disposed between the third lens E3 and the fourth lens E4; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5. Moreover, the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, and the fifth spacer element P5 are in contact with the inner wall of the lens barrel P0. Table 13 shows the basic parameter table of the spacer elements P1 to P4 and the lens barrel P0 of the optical imaging device 3001, and the unit of each parameter in Table 13 is millimeter (mm). The above spacer elements can block the entry of excess external light, enable the lenses and the lens barrel to be better supported, and enhance the structural stability of the optical imaging device 3001.

[0139] Table 13

[0140] ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.268 1.015 2.229 2.4 2.84 0.977 0.977 2.94 2.94 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.565 1.864 2.811 2.872 3.672 0.303 0.329 0.439

[0141] ​

[0142] ​ Shows a schematic structural diagram of the optical imaging device 3002 according to Embodiment 8 of the present application. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 7 will be omitted.

[0143] As ​ shown, the optical imaging device 3002 includes a lens barrel P0, a lens group E1 to E5, and a spacer element group P1 to P4. The optical imaging device 3002 further includes a diaphragm STO (not shown) disposed between the first lens and the second lens. The lens group of the optical imaging device 3002 is exactly the same as the lens group of the optical imaging device 3001 in Embodiment 7, and its basic parameters are shown in Tables 11 to 12-2 and will not be elaborated here. Table 14 shows the basic parameter table of the spacer elements P1 to P4 and the lens barrel P0 of the optical imaging device 3001.

[0144] Table 14

[0145] ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.285 1.013 2.029 2.2 2.64 0.977 0.977 2.74 2.74 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.147 1.147 2.94 2.94 3.472 0.323 0.301 0.497

[0146] ​

[0147] ​ Shows a schematic structural diagram of the optical imaging device 3003 according to Embodiment 9 of the present application. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 7 will be omitted.

[0148] As ​ shown, the optical imaging device 3003 includes a lens barrel P0, lens groups E1 to E5, and spacer element groups P1 to P4. The optical imaging device 3003 also includes a diaphragm STO (not shown) disposed between the first lens and the second lens. The lens groups of the optical imaging device 3003 are exactly the same as those of the optical imaging device 3001 in Embodiment 7, and their basic parameters are shown in Tables 11 to 12-2, which will not be elaborated here. Table 15 shows the basic parameter tables of the spacer elements P1 to P4 and the lens barrel P0 of the optical imaging device 3001.

[0149] Table 15

[0150] ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.216 1.013 2.682 2.56 3 0.977 0.977 3.1 3.1 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.239 1.239 3.3 3.3 3.832 0.263 0.271 0.576

[0151] ​ shows the axial chromatic aberration curves of the optical imaging device 3001 in Embodiment 7, the optical imaging device 3002 in Embodiment 8, and the optical imaging device 3003 in Embodiment 9. ​ shows the astigmatism curves of the optical imaging device 3001 in Embodiment 7, the optical imaging device 3002 in Embodiment 8, and the optical imaging device 3003 in Embodiment 9. ​ shows the longitudinal chromatic aberration curves of the optical imaging device 3001 in Embodiment 7, the optical imaging device 3002 in Embodiment 8, and the optical imaging device 3003 in Embodiment 9. According to ​ it can be known that the optical imaging devices 3001, 3002, and 3003 given in Embodiment 7, Embodiment 8, and Embodiment 9 can achieve good imaging quality.

[0152] In summary, the optical imaging devices of Embodiments 1 to 9 satisfy the relationships shown in Table 16.

[0153] Table 16

[0154]

[0155]

[0156] This application also provides an imaging device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging device described above.

[0157] The above description is only a preferred embodiment of the present application and an explanation of the technical principles applied. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. An optical imaging device, characterized in that, Comprising: A lens barrel, a lens group, and a spacer element group disposed within the lens barrel, wherein, The lens group sequentially includes, from the object side to the image side along the optical axis: a first lens with a negative optical power, whose image side is concave; a second lens with a positive optical power, whose object side is convex and image side is convex; a third lens; a fourth lens; and a fifth lens; The spacer element group includes a first spacer element disposed between the first lens and the second lens and at least partially in contact with the first lens; and The optical imaging device satisfies: -7.0 < f2 / f1 * (R3 / R2) < -5.8, 2.0 < d1s / R2 < 2.8, wherein, d1s is the inner diameter of the object side of the first spacer element in a plane perpendicular to the optical axis, R2 is the radius of curvature of the image side of the first lens, R3 is the radius of curvature of the object side of the second lens, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

2. The optical imaging device according to claim 1, wherein The optical imaging device satisfies: 1.6 < T12 / CP1 < 2.2, wherein, CP1 is the maximum thickness of the first spacer element along the optical axis, and T12 is the spacing distance between the first lens and the second lens along the optical axis.

3. The optical imaging device according to claim 1, wherein The optical imaging device satisfies: -3.7 < d0m / R10 < 0.37, wherein, d0m is the inner diameter of the image side of the lens barrel in a plane perpendicular to the optical axis, and R10 is the radius of curvature of the image side of the fifth lens.

4. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 3.55 < (D1m - d1m) / CP1 < 5.95, wherein, d1m is the inner diameter of the image side of the first spacer element in a plane perpendicular to the optical axis, D1m is the outer diameter of the image side of the first spacer element in a plane perpendicular to the optical axis, and CP1 is the maximum thickness of the first spacer element along the optical axis direction.

5. The optical imaging device according to any one of claims 1 to 4, characterized in that The spacer element group further includes a third spacer element disposed between the third lens and the fourth lens, and a fourth spacer element disposed between the fourth lens and the fifth lens, and the optical imaging device satisfies: 8.0 < EP34 / T34 < 13.7, wherein, EP34 is the spacing distance between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis, and T34 is the spacing distance between the third lens and the fourth lens along the optical axis.

6. The optical imaging device according to any one of claims 1 to 4, characterized in that The spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens, and the optical imaging device satisfies: 8.52 < D4m / R9 * (D4s / R8) < 27.6, wherein, D4s is the outer diameter of the object side of the fourth spacer element in a plane perpendicular to the optical axis, D4m is the outer diameter of the image side of the fourth spacer element in a plane perpendicular to the optical axis, R8 is the radius of curvature of the image side of the fourth lens, and R9 is the radius of curvature of the object side of the fifth lens.

7. The optical imaging device according to any one of claims 1 to 4, characterized in that The spacer element group further includes a third spacer element disposed between the third lens and the fourth lens, and the optical imaging device satisfies: 1.95 < (d3s + d3m) / f3 < 2.16, wherein, d3s is the inner diameter of the object side surface of the third spacer element in a plane perpendicular to the optical axis, d3m is the inner diameter of the image side surface of the third spacer element in a plane perpendicular to the optical axis, and f3 is the effective focal length of the third lens.

8. The optical imaging device according to any one of claims 1 to 4, characterized in that, The spacer element group further includes a second spacer element disposed between the second lens and the third lens, and a third spacer element disposed between the third lens and the fourth lens, and the optical imaging device satisfies: 1.75 < f23 / EP23 < 2.50, wherein, f23 is the combined focal length of the second lens and the third lens, and EP23 is the distance along the optical axis between the image side surface of the second spacer element and the object side surface of the third spacer element.

9. The optical imaging device according to any one of claims 1 to 4, characterized in that, The spacer element group further includes a third spacer element disposed between the third lens and the fourth lens, and the optical imaging device satisfies: 1.7 < (D3s - d3s) / d3s < 2.2, wherein, d3s is the inner diameter of the object side surface of the third spacer element in a plane perpendicular to the optical axis, and D3s is the outer diameter of the object side surface of the third spacer element in a plane perpendicular to the optical axis.

10. The optical imaging device according to any one of claims 1 to 4, characterized in that, The spacer element group further includes a second spacer element disposed between the second lens and the third lens, and a third spacer element disposed between the third lens and the fourth lens, and the optical imaging device satisfies: 7.4 < D3s / EP23 < 11.5, wherein, EP23 is the distance along the optical axis between the image side surface of the second spacer element and the object side surface of the third spacer element, and D3s is the outer diameter of the object side surface of the third spacer element in a plane perpendicular to the optical axis.

Images