Optical imaging system

Abstract

The present application discloses an optical imaging system, which comprises, in order from the object side to the image side along the optical axis: a first lens with negative optical power; a second lens with optical power; a third lens with optical power; a fourth lens with optical power; a fifth lens with optical power; a sixth lens with optical power; at least one mirror surface from the object side surface of the first lens to the image side surface of the sixth lens is a non-rotationally symmetric aspherical surface; a distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis and half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfy TTL / ImgH<1.6.

Description

Technical Field

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

[0002] In recent years, with the development of science and technology, the market demand for optical imaging systems suitable for portable electronic products has gradually increased. In addition, people have higher and higher requirements for the imaging quality of electronic products, which has led to the continuous upgrading of optical imaging systems. As the size of portable electronic products is usually getting smaller and smaller, the optical imaging systems installed on them are developing in the direction of miniaturization and thinness. However, such a development direction limits the total optical length of the optical imaging system, increasing the difficulty of designing and manufacturing the optical imaging system.

[0003] The optical distortion and TV distortion of wide-angle optical systems are large, and the resulting image is severely distorted. The increased design difficulty makes it more difficult to correct these distortions, and it is also more difficult to correct off-axis aberrations and sagittal aberrations.

[0004] In order to meet the needs of miniaturization and satisfy the imaging requirements, an optical imaging system is needed that can take into account both miniaturization and a large viewing angle, low distortion, and low aberration. Summary of the invention

[0005] The present application provides such an optical imaging system, which includes, in order from the object side to the image side along the optical axis: a first lens with optical power; a second lens with optical power; a third lens with optical power; a fourth lens with optical power; a fifth lens with optical power; and a sixth lens with optical power. At least one mirror surface from the object side of the first lens to the image side of the sixth lens is a non-rotationally symmetric aspherical surface.

[0006] In one embodiment, the optical imaging system includes a first lens having negative optical power.

[0007] In one embodiment, the optical imaging system includes a third lens having positive optical power.

[0008] In one embodiment, the object side surface of the first lens may be concave, and the image side surface may be concave; the object side surface of the second lens may be convex, and the image side surface may be concave; the object side surface of the third lens may be convex, and the image side surface may be convex.

[0009] In one embodiment, the object side surface of the fourth lens may be concave; the fifth lens has positive optical power, and its image side surface may be convex; the sixth lens has negative optical power, and its object side surface may be convex, and its image side surface may be concave.

[0010] In one embodiment, a distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis and half of the diagonal length of the effective pixel area on the imaging surface ImgH may satisfy TTL / ImgH<1.6.

[0011] In one embodiment, a center thickness CT5 of the fifth lens on the optical axis and a spacing distance T56 between the fifth lens and the sixth lens on the optical axis may satisfy 0.5<T56 / CT5<1.

[0012] In one embodiment, the effective focal length fx of the optical imaging system in the X-axis direction and the effective focal length f3 of the third lens may satisfy 0.5<fx / f3<1.5.

[0013] In one embodiment, the effective focal length fy of the optical imaging system in the Y-axis direction and the effective focal length f1 of the first lens may satisfy -0.7<fy / f1<-0.2.

[0014] In one embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens may satisfy -0.8<f5 / f6<-0.3.

[0015] In one embodiment, the effective focal length f1 of the first lens and the curvature radius R1 of the object-side surface of the first lens may satisfy 0.5<R1 / f1<1.5.

[0016] In one embodiment, a curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens may satisfy 0.5<R4 / R3<1.5.

[0017] In one embodiment, the effective focal length f3 of the third lens, the curvature radius R5 of the object-side surface of the third lens, and the curvature radius R6 of the image-side surface of the third lens may satisfy 0.3<f3 / (R5-R6)<0.8.

[0018] In one embodiment, a curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R10 of the image-side surface of the fifth lens may satisfy 0.1<R10 / R7<0.6.

[0019] In one embodiment, a curvature radius R10 of the image-side surface of the fifth lens and a curvature radius R11 of the object-side surface of the sixth lens may satisfy 0.3<R11 / (R11-R10)<0.8.

[0020] In one embodiment, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, and the center thickness CT4 of the fourth lens on the optical axis may satisfy 0.7<(CT1+CT2) / (CT3+CT4)<1.2.

[0021] In one embodiment, the sum of the spacing distances ΣAT between any two adjacent lenses from the first lens to the sixth lens on the optical axis and the center thickness CT6 of the sixth lens on the optical axis may satisfy 0.2<CT6 / ΣAT<0.7.

[0022] In one embodiment, an on-axis distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the effective radius vertex of the object side surface of the fourth lens and an on-axis distance SAG61 from the intersection of the object side surface of the sixth lens and the optical axis to the effective radius vertex of the object side surface of the sixth lens may satisfy 0.5<SAG41 / SAG61<1.0.

[0023] In one embodiment, the maximum effective radius DT21 of the object-side surface of the second lens and the maximum effective radius DT41 of the object-side surface of the fourth lens may satisfy 0.5<DT41 / DT21<1.0.

[0024] In one embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT62 of the image-side surface of the sixth lens may satisfy 0.2<DT11 / DT62<0.7.

[0025] The present application adopts six lenses, and through the reasonable allocation of the optical focal length, surface shape, center thickness of each lens and axial spacing between each lens, the above-mentioned optical imaging system has at least one beneficial effect such as large viewing angle, low aberration and miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0027] Figure 1 A schematic structural diagram of an optical imaging system according to Embodiment 1 of the present application is shown;

[0028] Figure 2 The RMS spot diameter of the optical imaging system of Example 1 is schematically shown in the first quadrant;

[0029] Figure 3 A schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application is shown;

[0030] Figure 4 The RMS spot diameter of the optical imaging system of Example 2 is schematically shown in the first quadrant;

[0031] Figure 5 A schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application is shown;

[0032] Figure 6 The RMS spot diameter of the optical imaging system of Example 3 is schematically shown in the first quadrant;

[0033] Figure 7 A schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application is shown;

[0034] Figure 8 The RMS spot diameter of the optical imaging system of Example 4 is schematically shown in the first quadrant;

[0035] Fig. 9 A schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application is shown;

[0036] Fig.10 The RMS spot diameter of the optical imaging system of Example 5 is schematically shown in the first quadrant;

[0037] Fig.11 A schematic structural diagram of an optical imaging system according to Embodiment 6 of the present application is shown;

[0038] Fig.12 The RMS spot diameter of the optical imaging system of Example 6 is schematically shown in the first quadrant;

[0039] Fig.13 A schematic structural diagram of an optical imaging system according to Embodiment 7 of the present application is shown;

[0040] Fig.14 The RMS spot diameter of the optical imaging system of Example 7 is schematically shown in the first quadrant;

[0041] Fig.15 A schematic structural diagram of an optical imaging system according to Embodiment 8 of the present application is shown;

[0042] Fig.16 The RMS spot diameter of the optical imaging system of Example 8 is schematically shown in the first quadrant;

[0043] Fig.17 A schematic structural diagram of an optical imaging system according to Embodiment 9 of the present application is shown;

[0044] Fig.18 The RMS spot diameter of the optical imaging system of Example 9 in the first quadrant is schematically shown. DETAILED DESCRIPTION

[0045] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to 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.

[0046] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0047] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0048] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0049] In this article, we define the direction parallel to the optical axis as the Z-axis direction, the direction perpendicular to the Z-axis and located in the meridian plane as the Y-axis direction, and the direction perpendicular to the Z-axis and located in the sagittal plane as the X-axis direction. Unless otherwise specified, all parameter symbols (such as the radius of curvature, etc.) except for the parameter symbols related to the field of view in this article represent the characteristic parameter values ​​along the Y-axis direction of the camera lens group. For example, unless otherwise specified, fx represents the radius of curvature of the optical imaging system in the X-axis direction, and fy represents the radius of curvature of the optical imaging system in the Y-axis direction.

[0050] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0051] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0052] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] The features, principles and other aspects of the present application are described in detail below.

[0054] The optical imaging system according to the exemplary embodiment of the present application may include, for example, six lenses with optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The six lenses are arranged in sequence from the object side to the image side along the optical axis. Among the first lens to the sixth lens, any two adjacent lenses may have an air gap between them.

[0055] In example embodiments, the first lens may have negative optical power.

[0056] In an exemplary embodiment, the object-side surface of the first lens may be a concave surface, and the image-side surface may be a concave surface; the object-side surface of the second lens may be a convex surface, and the image-side surface may be a concave surface.

[0057] In an exemplary embodiment, the third lens may have positive power, and its object side surface may be convex, and its image side surface may be convex; the fourth lens may have negative power, and its object side surface may be concave; the fifth lens may have positive power, and its image side surface may be convex; the sixth lens may have negative power, and its object side surface may be convex, and its image side surface may be concave. By reasonably controlling the positive and negative distribution of the power of each component of the system and the curvature of the lens surface, the low-order aberrations of the control system can be effectively balanced, and it is helpful to reduce the sensitivity of the optical imaging system to tolerances and improve the resolution, and it is also helpful to make the optical imaging system have the characteristics of miniaturization.

[0058] In the 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 object side surface of the first lens to the image side surface of the sixth lens is an aspherical mirror surface. The characteristic of the 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 adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspherical mirror surfaces.

[0059] In an exemplary embodiment, the object side surface or the image side surface of at least one of the first to sixth lenses is a non-rotationally symmetric aspherical surface. The non-rotationally symmetric aspherical surface is a rotationally symmetric aspherical surface with a non-rotationally symmetric component added thereto. The non-rotationally symmetric aspherical mirror surface is beneficial for reducing optical distortion and TV distortion, and is beneficial for correcting the off-axis meridian aberration and sagittal aberration of the optical imaging system, thereby improving the imaging quality of the optical imaging system.

[0060] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula TTL / ImgH<1.6, wherein TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis, and ImgH is half the diagonal length of the effective pixel area on the imaging surface. More specifically, TTL and ImgH may satisfy TTL / ImgH<1.59. By controlling the ratio of the total optical length and the image height of the optical imaging system, it is beneficial to miniaturize the optical imaging system and make it ultra-thin.

[0061] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.5<T56 / CT5<1, wherein CT5 is the center thickness of the fifth lens on the optical axis, and T56 is the spacing distance between the fifth lens and the sixth lens on the optical axis. More specifically, CT5 and T56 may satisfy 0.55<T56 / CT5<0.95. By matching the spacing distance between the fifth lens and the sixth lens with the center thickness of the fifth lens, it is beneficial to control the field curvature of the optical imaging system, thereby improving the imaging quality of the optical imaging system.

[0062] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.5<fx / f3<1.5, where fx is the effective focal length of the optical imaging system in the X-axis direction, and f3 is the effective focal length of the third lens. More specifically, fx and f3 may satisfy 0.8<fx / f3<1.2. By controlling the ratio of the effective focal length of the optical imaging system in the X-axis direction to the effective focal length of the third lens, it is beneficial to control the optical power of the third lens, and it is beneficial to balance the spherical aberration generated by the lens on the image side of the third lens, thereby enabling the optical imaging system to have good image quality.

[0063] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula -0.7<fy / f1<-0.2, wherein fy is the effective focal length of the optical imaging system in the Y-axis direction, and f1 is the effective focal length of the first lens. More specifically, fy and f1 may satisfy -0.50<fy / f1<-0.35. By controlling the ratio of the effective focal length of the optical imaging system in the Y-axis direction to the effective focal length of the first lens, it is beneficial to control the optical power of the first lens, and effectively balance the spherical aberration generated by the lens on the image side of the first lens, thereby enabling the optical imaging system to have good image quality.

[0064] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula -0.8<f5 / f6<-0.3, wherein f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. More specifically, f5 and f6 may satisfy -0.75<f5 / f6<-0.45. By controlling the effective focal length ratio of the fifth lens and the sixth lens, it is beneficial to balance the spherical aberration generated by the two lenses, and it is beneficial for the lens on the object side of the fifth lens to balance the remaining spherical aberration between the fifth lens and the sixth lens with less burden, thereby making it easier for the optical imaging system to maintain image quality near the on-axis field of view. The imaging quality of the optical imaging system is relatively stable and reliable.

[0065] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.5<R1 / f1<1.5, wherein f1 is the effective focal length of the first lens, and R1 is the radius of curvature of the object side surface of the first lens. More specifically, f1 and R1 may satisfy 0.6<R1 / f1<0.8. By controlling the ratio of the radius of curvature of the object side surface of the first lens to its effective focal length, the shape of the first lens may be controlled, which in turn helps to control the fifth-order spherical aberration generated by the object side surface of the first lens, so that the contribution rate of the first lens to the fifth-order spherical aberration of the optical imaging system is controlled.

[0066] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.5<R4 / R3<1.5, wherein R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens. More specifically, R3 and R4 satisfy 0.8<R4 / R3<1.2. By controlling the ratio of the radius of curvature of the object side surface of the second lens to the radius of curvature of the image side surface thereof, it is advantageous to control the thickness of the second lens at different positions from the optical axis, and a second lens with a suitable thickness ratio may have better processability. In addition, it is advantageous to control the trend of edge light, thereby reducing the sensitivity of the second lens.

[0067] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.3<f3 / (R5-R6)<0.8, wherein f3 is the effective focal length of the third lens, R5 is the radius of curvature of the object side surface of the third lens, and R6 is the radius of curvature of the image side surface of the third lens. More specifically, f3, R5, and R6 may satisfy 0.4<f3 / (R5-R6)<0.5. By matching the effective focal length of the third lens, the radius of curvature of the object side surface, and the radius of curvature of the image side surface, it is beneficial to control the high-order spherical aberration contributed by the third lens, thereby enabling the optical imaging system to have good imaging quality.

[0068] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.1<R10 / R7<0.6, where R7 is the radius of curvature of the object side surface of the fourth lens, and R10 is the radius of curvature of the image side surface of the fifth lens. More specifically, R7 and R10 may satisfy 0.15<R10 / R7<0.55. By controlling the ratio of the radius of curvature of the object side surface of the fifth lens to the radius of curvature of the image side surface of the fourth lens, it is beneficial to balance the aberrations of the optical imaging system, thereby improving the imaging quality of the optical imaging system.

[0069] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.3<R11 / (R11-R10)<0.8, wherein R10 is the radius of curvature of the image side surface of the fifth lens, and R11 is the radius of curvature of the object side surface of the sixth lens. More specifically, R10 and R11 may satisfy 0.52<R11 / (R11-R10)<0.62. By matching the radius of curvature of the image side surface of the fifth lens with the radius of curvature of the object side surface of the sixth lens, it is beneficial to control the aberrations generated by the fifth lens and the sixth lens, thereby enabling the optical imaging system to have better imaging quality.

[0070] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.7<(CT1+CT2) / (CT3+CT4)<1.2, wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, CT3 is the center thickness of the third lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis. More specifically, CT1, CT2, CT3, and CT4 may satisfy 0.75<(CT1+CT2) / (CT3+CT4)<1.05. By matching the center thicknesses of the four lenses from the first lens to the fourth lens, it is beneficial to make the thicknesses of the various lenses more balanced, improve the processability of each lens, and make the optical imaging system more compact, thereby facilitating the miniaturization of the optical imaging system.

[0071] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.2<CT6 / ΣAT<0.7, wherein ΣAT is the sum of the spacing distances between any two adjacent lenses from the first lens to the sixth lens on the optical axis. Exemplarily, ΣAT=T12+T23+T34+T45+T56, as mentioned above, T56 is the spacing distance between the fifth lens and the sixth lens on the optical axis, and T12 to T45 are the spacing distances between the corresponding adjacent lenses. CT6 is the center thickness of the sixth lens on the optical axis. More specifically, ΣAT and CT6 may satisfy 0.3<CT6 / ΣAT<0.5. By controlling the ratio of the center thickness of the sixth lens to the sum of the lens spacings, it is beneficial to control the center thickness of the sixth lens, so that the sixth lens has better processability, and at the same time it is beneficial to reduce the contribution rate of the sixth lens to the distortion of the optical imaging system, thereby enabling the optical imaging system to have better distortion performance.

[0072] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.5<SAG41 / SAG61<1.0, wherein SAG41 is the on-axis distance from the intersection of the object side surface of the fourth lens and the optical axis to the vertex of the effective radius of the object side surface of the fourth lens, and SAG61 is the on-axis distance from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective radius of the object side surface of the sixth lens. More specifically, SAG41 and SAG61 may satisfy 0.65<SAG41 / SAG61<0.90. By controlling the ratio of the object side sag of the fourth lens to the object side sag of the sixth lens, the incident angles of light at the object side surfaces of the fourth lens and the sixth lens, respectively, can be effectively controlled, thereby improving the matching degree between the optical imaging system and the chip.

[0073] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.5<DT41 / DT21<1.0, wherein DT21 is the maximum effective radius of the object side of the second lens, and DT41 is the maximum effective radius of the object side of the fourth lens. More specifically, DT21 and DT41 may satisfy 0.80<DT41 / DT21<0.95. By controlling the aperture ratio of the object side of the second lens to the object side of the fourth lens, on the one hand, it is beneficial to control the aperture of the fourth lens and reduce the size of the fourth lens, thereby making the optical imaging system light and thin. On the other hand, it is beneficial to limit the range of the incident light while eliminating the poor quality light in the edge area, thereby reducing the off-axis aberrations, so as to effectively improve the resolution of the optical imaging system.

[0074] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 0.2<DT11 / DT62<0.7, wherein DT11 is the maximum effective radius of the object side of the first lens, and DT62 is the maximum effective radius of the image side of the sixth lens. More specifically, DT11 and DT62 may satisfy 0.45<DT11 / DT62<0.58. By controlling the aperture ratio of the object side of the first lens to the image side of the sixth lens, the volume of the portion of the optical imaging system facing the object side can be effectively reduced, thereby miniaturizing the optical imaging system. This allows the optical imaging system to have better installation characteristics and can be better suited for devices such as full-screen mobile phones.

[0075] In an exemplary embodiment, the optical imaging system may further include at least one aperture. The aperture may be disposed at an appropriate position as required, for example, between the second lens and the third lens. Optionally, the optical imaging system may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0076] The optical imaging system according to the above-mentioned embodiment of the present application may use multiple lenses, such as the six lenses described above. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, the volume of the imaging system can be effectively reduced, the sensitivity of the imaging system can be reduced, and the processability of the imaging system can be improved, so that the optical imaging system is more conducive to production and processing and can be applied to portable electronic products. At the same time, the optical imaging system of the present application also has the characteristics of miniaturization and excellent optical properties such as large viewing angle, low aberration, and low distortion.

[0077] 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 system 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 system is not limited to including six lenses. If necessary, the optical imaging system may also include other numbers of lenses.

[0078] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0079] Example 1

[0080] The following reference Figure 1 to Figure 2 An optical imaging system according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical imaging system according to Example 1 of the present application is shown.

[0081] like Figure 1 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a filter E7.

[0082] The first lens E1 has negative optical power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive optical power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive optical power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative optical power, and its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive optical power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative optical power, and its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and the light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0083] Table 1 shows a basic parameter table of the optical imaging system of Example 1, wherein the units of the curvature radius Y, the curvature radius X, the thickness / distance and the focal length are all millimeters (mm).

[0084]

[0085] Table 1

[0086] In Example 1, the effective focal length fx of the optical imaging system in the X-axis direction is 2.88 mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 2.88 mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 6.10 mm, the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S15 is 3.85 mm, and the value Semi-FOV of half the maximum field of view angle is 49.6°.

[0087] In Example 1, the object side surface and the image side surface of any lens among the first lens E1 to the fifth lens E5 are both rotationally symmetric aspherical surfaces, and the surface shape x of each rotationally symmetric aspherical lens can be defined by but not limited to the following aspherical formula:

[0088]

[0089] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0090]

[0091]

[0092] Table 2

[0093] It can also be seen from Table 1 that the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are non-rotationally symmetric aspherical surfaces (i.e., AAS surfaces). The surface shape of the non-rotationally symmetric aspherical surfaces can be defined by, but not limited to, the following non-rotationally symmetric aspherical surface formula:

[0094]

[0095] Where z is the sagittal height of the surface parallel to the Z axis; C x , C y are the curvatures of the surface vertices in the X and Y axis directions respectively (the curvature is the inverse of the curvature radius); K x , K y are cone coefficients in the X and Y axis directions respectively; AR, BR, CR, DR, ER, FR, GR, HR, JR are the 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th, and 20th order coefficients in the rotational symmetric components of the aspheric surface respectively; AP, BP, CP, DP, EP, FP, GP, HP, and JP are the 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th, and 20th order coefficients in the non-rotational symmetric components of the aspheric surface respectively. Tables 3 and 4 below respectively give the rotational symmetric components of the non-rotationally symmetric aspheric surfaces S11 and S12 that can be used in Example 1 and the various high-order coefficients of the non-rotational symmetric components.

[0096] AAS side AR BR CR DR ER FR GR HR JR S11 -2.9780E-01 1.7024E-01 -9.2451E-02 4.7619E-02 -1.8841E-02 4.8923E-03 -7.6496E-04 6.5088E-05 -2.3153E-06 S12 -9.9053E-02 3.8909E-02 -9.9323E-03 1.2524E-03 5.0498E-05 -4.5265E-05 6.8331E-06 -4.5165E-07 1.1343E-08

[0097] Table 3

[0098] AAS side AP BP CP DP EP FP GP HP JP S11 1.5744E-03 9.2682E-04 -5.0676E-06 -5.5722E-06 1.1078E-05 -5.0706E-06 -5.5820E-06 2.5318E-06 0.0000E+00 S12 -2.8545E-03 -2.2540E-03 -1.4234E-03 -5.7282E-05 -6.4323E-04 3.8278E-05 -4.5028E-05 -6.8926E-05 0.0000E+00

[0099] Table 4

[0100] Figure 2 The RMS spot diameter of the optical imaging system of Example 1 at different image height positions in the first quadrant is shown. Figure 2 The relationship between the RMS spot diameter and the real light image height is shown. Figure 2 In the table, the X real light height and Y real light height are both in millimeters (mm), the smallest RMS spot diameter is 0.0021675mm, the largest RMS spot diameter is 0.028047mm, the mean RMS spot diameter is 0.0096413mm, and the standard deviation of the RMS spot diameter is 0.0064488mm. Figure 2 It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality.

[0101] Example 2

[0102] The following reference Figure 3 to Figure 4 The optical imaging system according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 3 A schematic structural diagram of an optical imaging system according to Example 2 of the present application is shown.

[0103] like Figure 3As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a filter E7.

[0104] The first lens E1 has negative optical power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive optical power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive optical power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative optical power, and its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive optical power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative optical power, and its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and the light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0105] In Example 2, the effective focal length fx of the optical imaging system in the X-axis direction is 2.90 mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 2.91 mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 6.07 mm, the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S15 is 3.85 mm, and the value Semi-FOV of half the maximum field of view angle is 54.3°.

[0106] Table 5 shows the basic parameter table of the optical imaging system of Example 2, wherein the units of the radius of curvature Y, radius of curvature X, thickness / distance and focal length are all in millimeters (mm). Table 6 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 2, wherein each aspheric surface type can be defined by the formula (1) given in the above-mentioned Example 1. Tables 7 and 8 respectively show the rotationally symmetric components and the high-order coefficients of the non-rotationally symmetric components of the non-rotationally symmetric aspheric surfaces S11 and S12 that can be used in Example 2, wherein the non-rotationally symmetric aspheric surface type can be defined by the formula (2) given in the above-mentioned Example 1.

[0107]

[0108] Table 5

[0109]

[0110]

[0111] Table 6

[0112] AAS side AR BR CR DR ER FR GR HR JR S11 -2.9600E-01 1.7027E-01 -9.2494E-02 4.7618E-02 -1.8841E-02 4.8923E-03 -7.6496E-04 6.5085E-05 -2.3149E-06 S12 -9.9881E-02 3.9265E-02 -9.9134E-03 1.2513E-03 5.0235E-05 -4.5276E-05 6.8343E-06 -4.5154E-07 1.1349E-08

[0113] Table 7

[0114] AAS side AP BP CP DP EP FP GP HP JP S11 2.8257E-03 4.4103E-04 -5.9771E-05 6.6058E-07 9.8474E-06 -3.2485E-06 -2.5852E-06 -3.9349E-07 0.0000E+00 S12 -3.5988E-03 -2.0201E-03 -6.0973E-04 1.3077E-04 -2.1902E-04 2.9495E-05 -2.7850E-05 -6.1697E-06 0.0000E+00

[0115] Table 8

[0116] Figure 4 The RMS spot diameter of the optical imaging system of Example 2 at different image height positions in the first quadrant is shown. Figure 4 The relationship between the RMS spot diameter and the real light image height is shown. Figure 4 In the table, the X real light height and Y real light height are both in millimeters (mm), the smallest RMS spot diameter is 0.0014217mm, the largest RMS spot diameter is 0.031226mm, the mean RMS spot diameter is 0.0058934mm, and the standard deviation of the RMS spot diameter is 0.0039676mm. Figure 4 It can be seen that the optical imaging system provided in Example 2 can achieve good imaging quality.

[0117] Example 3

[0118] The following reference Figures 5 and 6 An optical imaging system according to Example 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging system according to Example 3 of the present application is shown.

[0119] like Figure 5 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a filter E7.

[0120] The first lens E1 has negative optical power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive optical power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive optical power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative optical power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive optical power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative optical power, and its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and the light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0121] In Example 3, the effective focal length fx of the optical imaging system in the X-axis direction is 2.85 mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 2.85 mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 6.05 mm, the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S15 is 3.85 mm, and the value Semi-FOV of half the maximum field of view angle is 53.8°.

[0122] Table 9 shows the basic parameter table of the optical imaging system of Example 3, wherein the units of the radius of curvature Y, radius of curvature X, thickness / distance and focal length are all in millimeters (mm). Table 10 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein each aspherical surface type can be defined by the formula (1) given in the above-mentioned Example 1. Tables 11 and 12 respectively show the rotationally symmetric components and the high-order coefficients of the non-rotationally symmetric components of the non-rotationally symmetric aspherical surfaces S11 and S12 that can be used in Example 3, wherein the non-rotationally symmetric aspherical surface type can be defined by the formula (2) given in the above-mentioned Example 1.

[0123]

[0124]

[0125] Table 9

[0126] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 6.3658E-01 -7.4134E-02 1.0438E-02 -1.0317E-02 1.7916E-04 -9.9611E-04 1.1323E-04 -4.1574E-05 3.1852E-05 S2 4.6384E-01 -6.8289E-02 -3.3289E-03 -8.7275E-03 -1.0456E-04 -5.1649E-05 1.5390E-04 1.8716E-06 9.0282E-06 S3 -4.7633E-02 -1.3545E-02 3.2007E-03 -8.8058E-04 -5.3054E-05 -3.3683E-04 -1.0374E-04 -3.4268E-05 6.6591E-06 S4 3.1343E-02 8.0332E-03 2.9940E-03 8.9862E-04 3.0266E-04 7.6248E-05 2.7597E-05 1.2473E-05 5.7335E-06 S5 -2.8874E-03 -2.0465E-03 -3.1474E-04 -5.9669E-05 -5.4473E-08 -1.0463E-05 1.9218E-07 8.2443E-07 5.4349E-06 S6 -8.8076E-02 -7.3996E-03 -6.5583E-04 -1.7701E-04 -4.8121E-05 -3.8634E-06 5.0127E-06 1.4405E-06 -1.2007E-06 S7 -2.2292E-01 1.4967E-02 5.2976E-03 9.9795E-04 -9.7175E-05 -5.5260E-05 -6.7877E-07 8.7171E-07 -3.1611E-06 S8 -1.4173E-01 3.0306E-02 4.3467E-03 8.5775E-04 2.3445E-04 -3.3775E-05 3.0352E-05 3.5526E-06 -5.0814E-06 S9 -3.0526E-02 1.4581E-02 -9.3798E-03 -9.1499E-04 1.3346E-04 -2.2911E-04 8.2549E-05 -1.8065E-05 2.1022E-06 S10 5.9773E-01 1.0767E-01 -2.5902E-02 -5.7289E-03 2.8964E-03 1.1816E-03 -4.0287E-04 -6.8186E-05 1.6135E-05

[0127] Table 10

[0128] AAS side AR BR CR DR ER FR GR HR JR S11 -2.9464E-01 1.6978E-01 -9.2452E-02 4.7628E-02 -1.8840E-02 4.8922E-03 -7.6497E-04 6.5078E-05 -2.3142E-06 S12 -1.0158E-01 3.9611E-02 -1.0015E-02 1.2491E-03 5.0999E-05 -4.5204E-05 6.8359E-06 -4.5190E-07 1.1336E-08

[0129] Table 11

[0130] AAS side AP BP CP DP EP FP GP HP JP S11 5.2706E-03 -1.7444E-04 -1.7294E-04 -6.3297E-06 8.4562E-06 8.9551E-07 3.9635E-06 5.9895E-06 0.0000E+00 S12 9.4505E-04 -5.3303E-04 9.7132E-04 7.9237E-04 1.8840E-03 9.4682E-05 -1.5078E-04 -8.3828E-05 0.0000E+00

[0131] Table 12

[0132] Figure 6 The RMS spot diameter of the optical imaging system of Example 3 at different image height positions in the first quadrant is shown. Figure 6 The relationship between the RMS spot diameter and the real light image height is shown. Figure 6 In the table, the X real light height and Y real light height are both in millimeters (mm), the smallest RMS spot diameter is 0.00092829mm, the largest RMS spot diameter is 0.0093665mm, the mean RMS spot diameter is 0.0037792mm, and the standard deviation of the RMS spot diameter is 0.0019208mm. Figure 6 It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality.

[0133] Example 4

[0134] The following reference Figures 7 and 8 An optical imaging system according to Example 4 of the present application is described. Figure 7 A schematic structural diagram of an optical imaging system according to Example 4 of the present application is shown.

[0135] like Figure 7 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a filter E7.

[0136] The first lens E1 has negative optical power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive optical power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive optical power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative optical power, and its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive optical power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative optical power, and its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and the light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0137] In Example 4, the effective focal length fx of the optical imaging system in the X-axis direction is 2.85 mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 2.85 mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 6.02 mm, the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S15 is 3.85 mm, and the value Semi-FOV of half the maximum field of view angle is 53.8°.

[0138] Table 13 shows the basic parameter table of the optical imaging system of Example 4, wherein the units of the radius of curvature Y, radius of curvature X, thickness / distance and focal length are all in millimeters (mm). Table 14 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein each aspherical surface type can be defined by the formula (1) given in the above-mentioned Example 1. Tables 15 and 16 respectively show the rotationally symmetric components and the high-order coefficients of the non-rotationally symmetric components of the non-rotationally symmetric aspherical surfaces S11 and S12 that can be used in Example 4, wherein the non-rotationally symmetric aspherical surface type can be defined by the formula (2) given in the above-mentioned Example 1.

[0139]

[0140] Table 13

[0141]

[0142]

[0143] Table 14

[0144] AAS side AR BR CR DR ER FR GR HR JR S11 -2.9579E-01 1.6977E-01 -9.2472E-02 4.7628E-02 -1.8840E-02 4.8922E-03 -7.6498E-04 6.5077E-05 -2.3138E-06 S12 -1.0041E-01 3.9090E-02 -9.9916E-03 1.2515E-03 5.0757E-05 -4.5231E-05 6.8358E-06 -4.5175E-07 1.1363E-08

[0145] Table 15

[0146] AAS side AP BP CP DP EP FP GP HP JP S11 4.2475E-03 1.1797E-05 -1.0618E-04 -1.3313E-05 6.5758E-06 5.2947E-07 2.2460E-06 3.8676E-06 0.0000E+00 S12 1.5972E-03 3.1729E-04 8.8134E-04 2.8625E-04 2.4751E-03 4.4850E-05 -1.0116E-04 4.5012E-05 0.0000E+00

[0147] Table 16

[0148] Figure 8 The RMS spot diameter of the optical imaging system of Example 4 at different image height positions in the first quadrant is shown. Figure 8 The relationship between the RMS spot diameter and the real light image height is shown. Figure 8 In the table, the X real light height and Y real light height are both in millimeters (mm), the smallest RMS spot diameter is 0.0011291mm, the largest RMS spot diameter is 0.0092401mm, the mean RMS spot diameter is 0.003555mm, and the standard deviation of the RMS spot diameter is 0.0018184mm. Figure 8 It can be seen that the optical imaging system provided in Example 4 can achieve good imaging quality.

[0149] Example 5

[0150] The following reference Figures 9 and 10 An optical imaging system according to Example 5 of the present application is described. Fig. 9 A schematic structural diagram of an optical imaging system according to Example 5 of the present application is shown.

[0151] like Fig. 9 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a filter E7.

[0152] The first lens E1 has negative optical power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has negative optical power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive optical power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative optical power, and its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive optical power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative optical power, and its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and the light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0153] In Example 5, the effective focal length fx of the optical imaging system in the X-axis direction is 2.85 mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 2.85 mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 6.09 mm, the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S15 is 3.85 mm, and the value Semi-FOV of half the maximum field of view angle is 53.9°.

[0154] Table 17 shows a basic parameter table of the optical imaging system of Example 5, wherein the units of the radius of curvature Y, radius of curvature X, thickness / distance and focal length are all in millimeters (mm). Table 18 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 5, wherein each aspheric surface type can be defined by the formula (1) given in the above-mentioned Example 1. Tables 19 and 20 respectively show the rotationally symmetric components and the high-order coefficients of the non-rotationally symmetric components of the non-rotationally symmetric aspheric surfaces S11 and S12 that can be used in Example 5, wherein the non-rotationally symmetric aspheric surface type can be defined by the formula (2) given in the above-mentioned Example 1.

[0155]

[0156] Table 17

[0157] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 6.4900E-01 -7.3490E-02 1.2038E-02 -9.3273E-03 3.6491E-04 -8.2132E-04 1.4529E-04 -1.5441E-05 4.3327E-05 S2 4.7809E-01 -5.3154E-02 5.3901E-04 -7.1377E-03 -4.0265E-04 -1.1009E-04 2.1070E-04 7.3921E-05 4.0083E-05 S3 -2.9278E-02 -1.2616E-02 5.0553E-03 -1.5844E-03 -1.1891E-04 -3.4862E-04 -5.4019E-05 -2.6023E-05 9.4760E-06 S4 2.3687E-02 9.2250E-03 3.3148E-03 9.1784E-04 3.1309E-04 8.9047E-05 3.6058E-05 1.4236E-05 3.7094E-06 S5 -7.2354E-03 -2.9181E-03 -5.0959E-04 -9.9485E-05 -2.4520E-05 -1.5240E-05 1.9128E-07 6.1831E-06 9.4695E-06 S6 -1.1699E-01 -8.3821E-03 -1.2838E-03 -4.8807E-04 -1.6250E-04 -3.3353E-05 4.5020E-06 6.2588E-06 6.7935E-06 S7 -2.4492E-01 2.2557E-02 6.8267E-03 5.3401E-04 -1.7596E-04 -1.0662E-04 4.2754E-05 3.9615E-06 -1.0193E-05 S8 -1.6516E-01 3.3851E-02 3.2303E-03 5.8916E-04 5.4760E-04 -2.3235E-04 5.2636E-05 3.1953E-06 -4.2997E-06 S9 2.3042E-02 1.1818E-02 -6.9704E-03 -1.7197E-03 6.0792E-04 -5.3707E-04 6.7830E-05 -1.2770E-05 -2.2867E-05 S10 5.0399E-01 1.0384E-01 -1.8715E-02 -8.3243E-03 1.9525E-03 1.1796E-03 -3.6679E-04 -1.4478E-04 7.3805E-05

[0158] Table 18

[0159] AAS side AR BR CR DR ER FR GR HR JR S11 -2.9643E-01 1.6966E-01 -9.2488E-02 4.7628E-02 -1.8840E-02 4.8923E-03 -7.6496E-04 6.5078E-05 -2.3144E-06 S12 -1.0074E-01 3.9703E-02 -1.0048E-02 1.2487E-03 5.1283E-05 -4.5167E-05 6.8384E-06 -4.5220E-07 1.1270E-08

[0160] Table 19

[0161] AAS side AP BP CP DP EP FP GP HP JP S11 4.3899E-03 9.6881E-05 -2.2194E-05 -1.9922E-05 2.0391E-06 3.7097E-06 1.0489E-06 -2.3621E-06 0.0000E+00 S12 2.7618E-03 2.7002E-03 1.8306E-03 2.3750E-04 2.6083E-03 -2.9449E-05 -1.1015E-04 3.7410E-05 0.0000E+00

[0162] Table 20

[0163] Fig.10The RMS spot diameter of the optical imaging system of Example 5 at different image height positions in the first quadrant is shown. Fig.10 The relationship between the RMS spot diameter and the real light image height is shown. Fig.10 In the table, the X real light height and Y real light height are both in millimeters (mm), the smallest RMS spot diameter is 0.00077895mm, the largest RMS spot diameter is 0.012541mm, the mean RMS spot diameter is 0.0046786mm, and the standard deviation of the RMS spot diameter is 0.0026334mm. Fig.10 It can be seen that the optical imaging system provided in Example 5 can achieve good imaging quality.

[0164] Example 6

[0165] The following reference Figure 11 to Figure 12 An optical imaging system according to Example 6 of the present application is described. Fig.11 A schematic structural diagram of an optical imaging system according to Example 6 of the present application is shown.

[0166] like Fig.11 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a filter E7.

[0167] The first lens E1 has negative optical power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has negative optical power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive optical power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative optical power, and its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive optical power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative optical power, and its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and the light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0168] In Example 6, the effective focal length fx of the optical imaging system in the X-axis direction is 2.85 mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 2.85 mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 6.09 mm, the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S15 is 3.85 mm, and the value Semi-FOV of half the maximum field of view angle is 53.8°.

[0169] Table 21 shows the basic parameter table of the optical imaging system of Example 6, wherein the units of the radius of curvature Y, radius of curvature X, thickness / distance and focal length are all in millimeters (mm). Table 22 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein each aspherical surface type can be defined by the formula (1) given in the above-mentioned Example 1. Tables 23 and 24 respectively show the rotationally symmetric components and the high-order coefficients of the non-rotationally symmetric components of the non-rotationally symmetric aspherical surfaces S11 and S12 that can be used in Example 6, wherein the non-rotationally symmetric aspherical surface type can be defined by the formula (2) given in the above-mentioned Example 1.

[0170]

[0171] Table 21

[0172]

[0173]

[0174] Table 22

[0175] AAS side AR BR CR DR ER FR GR HR JR S11 -2.9999E-01 1.6991E-01 -9.2412E-02 4.7631E-02 -1.8840E-02 4.8922E-03 -7.6497E-04 6.5074E-05 -2.3140E-06 S12 -1.0337E-01 4.0169E-02 -1.0117E-02 1.2510E-03 5.1673E-05 -4.5145E-05 6.8340E-06 -4.5243E-07 1.1299E-08

[0176] Table 23

[0177] AAS side AP BP CP DP EP FP GP HP JP S11 5.8403E-03 1.3014E-04 -1.3576E-04 -2.0214E-05 5.6099E-06 2.0914E-06 2.5122E-06 2.8077E-06 0.0000E+00 S12 1.6185E-03 2.7948E-03 2.3726E-03 1.0961E-03 1.7596E-03 -1.1432E-05 -1.6544E-04 -4.2271E-05 0.0000E+00

[0178] Table 24

[0179] Fig.12 The RMS spot diameter of the optical imaging system of Example 6 at different image height positions in the first quadrant is shown. Fig.12 The relationship between the RMS spot diameter and the real light image height is shown. Fig.12 In the table, the X real light height and Y real light height are both in millimeters (mm), the smallest RMS spot diameter is 0.00078783mm, the largest RMS spot diameter is 0.011602mm, the mean RMS spot diameter is 0.0043785mm, and the standard deviation of the RMS spot diameter is 0.0022669mm. Fig.12 It can be seen that the optical imaging system provided in Example 6 can achieve good imaging quality.

[0180] Example 7

[0181] The following reference Figure 13 to Figure 14 An optical imaging system according to Example 7 of the present application is described. Fig.13 A schematic structural diagram of an optical imaging system according to Example 7 of the present application is shown.

[0182] like Fig.13 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a filter E7.

[0183] The first lens E1 has negative optical power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive optical power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive optical power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative optical power, and its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive optical power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative optical power, and its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and the light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0184] In Example 7, the effective focal length fx of the optical imaging system in the X-axis direction is 2.81 mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 2.82 mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 6.05 mm, the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S15 is 3.85 mm, and the value Semi-FOV of half the maximum field of view angle is 54.0°.

[0185] Table 25 shows the basic parameter table of the optical imaging system of Example 7, wherein the units of the radius of curvature Y, radius of curvature X, thickness / distance and focal length are all in millimeters (mm). Table 26 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 7, wherein each aspherical surface type can be defined by the formula (1) given in the above-mentioned Example 1. Tables 27 and 28 respectively show the rotationally symmetric components and the high-order coefficients of the non-rotationally symmetric components of the non-rotationally symmetric aspherical surfaces S11 and S12 that can be used in Example 7, wherein the non-rotationally symmetric aspherical surface type can be defined by the formula (2) given in the above-mentioned Example 1.

[0186]

[0187] Table 25

[0188] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 5.3809E-01 -5.4545E-02 1.5225E-02 -4.9394E-03 9.6401E-04 -4.6039E-04 7.7089E-05 -4.8142E-05 7.3511E-06 S2 4.0468E-01 -4.4238E-02 5.1598E-03 -3.8386E-03 6.7646E-05 -1.3833E-04 3.6497E-05 -2.4967E-05 4.9494E-06 S3 -4.4269E-02 -1.5962E-02 2.6632E-03 -1.2485E-04 2.6132E-04 -2.7778E-05 -1.0737E-05 -1.5733E-05 3.3221E-06 S4 2.2036E-02 3.8156E-03 1.6179E-03 4.8562E-04 1.5633E-04 3.6365E-05 4.9828E-06 2.9398E-06 4.6487E-06 S5 -2.3051E-03 -1.5970E-03 -1.9322E-04 -4.8531E-05 5.3883E-06 4.7028E-08 5.3331E-06 -4.4164E-06 8.1903E-07 S6 -1.0001E-01 -7.1875E-03 -8.5442E-05 -5.7116E-05 -4.2340E-05 -1.5181E-05 -2.3577E-06 1.2896E-06 -9.9028E-08 S7 -2.3020E-01 1.5210E-02 6.2078E-03 7.4182E-04 -3.1737E-04 -7.1801E-05 2.2625E-05 1.0067E-05 -4.1608E-06 S8 -1.3915E-01 3.0519E-02 4.6962E-03 -4.3476E-05 3.7826E-04 -2.1053E-04 6.6082E-05 -5.1090E-06 -3.9330E-06 S9 -3.4316E-02 1.5788E-02 -9.8295E-03 -7.6092E-04 5.4251E-04 -6.7151E-04 2.9632E-04 -1.2611E-04 3.1442E-05 S10 2.8270E-01 7.3616E-02 -3.9974E-03 -3.0360E-03 -2.9653E-04 4.2852E-04 -4.2637E-05 -1.1970E-05 2.2890E-06

[0189] Table 26

[0190] AAS side AR BR CR DR ER FR GR HR JR S11 -2.9743E-01 1.6980E-01 -9.2445E-02 4.7629E-02 -1.8840E-02 4.8922E-03 -7.6497E-04 6.5075E-05 -2.3140E-06 S12 -9.8607E-02 3.9195E-02 -9.9884E-03 1.2511E-03 5.0854E-05 -4.5222E-05 6.8342E-06 -4.5178E-07 1.1324E-08

[0191] Table 27

[0192] AAS side AP BP CP DP EP FP GP HP JP S11 6.3237E-03 6.6410E-05 -2.0461E-04 -1.1317E-05 8.2841E-06 -3.8722E-07 4.7754E-06 8.0524E-06 0.0000E+00 S12 1.5302E-04 4.8348E-04 8.6581E-04 1.6051E-04 2.1568E-03 -8.4430E-06 -6.9915E-05 4.9051E-05 0.0000E+00

[0193] Table 28

[0194] Fig.14 The RMS spot diameter of the optical imaging system of Example 7 at different image height positions in the first quadrant is shown. Fig.14 The relationship between the RMS spot diameter and the real light image height is shown. Fig.14 In the table, the X real light height and Y real light height are both in millimeters (mm), the smallest RMS spot diameter is 0.0018787mm, the largest RMS spot diameter is 0.030558mm, the mean RMS spot diameter is 0.0088953mm, and the standard deviation of the RMS spot diameter is 0.0069636mm. Fig.14 It can be seen that the optical imaging system provided in Example 7 can achieve good imaging quality.

[0195] Example 8

[0196] The following reference Figure 15 to Figure 16 An optical imaging system according to Example 8 of the present application is described. Fig.15 A schematic structural diagram of an optical imaging system according to Example 8 of the present application is shown.

[0197] like Fig.15 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a filter E7.

[0198] The first lens E1 has negative optical power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive optical power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive optical power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative optical power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive optical power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative optical power, and its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and the light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0199] In Example 8, the effective focal length fx of the optical imaging system in the X-axis direction is 2.86 mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 2.86 mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 5.92 mm, the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S15 is 3.85 mm, and the value Semi-FOV of half the maximum field of view angle is 53.8°.

[0200] Table 29 shows the basic parameter table of the optical imaging system of Example 8, wherein the units of the radius of curvature Y, radius of curvature X, thickness / distance and focal length are all in millimeters (mm). Table 30 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 8, wherein each aspherical surface type can be defined by the formula (1) given in the above-mentioned Example 1. Tables 31 and 32 show the rotationally symmetric components and the high-order coefficients of the non-rotationally symmetric components of the non-rotationally symmetric aspherical surfaces S11 and S12 that can be used in Example 8, wherein the non-rotationally symmetric aspherical surface type can be defined by the formula (2) given in the above-mentioned Example 1.

[0201]

[0202] Table 29

[0203] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 5.3460E-01 -5.4865E-02 1.2191E-02 -5.3300E-03 8.6085E-04 -4.6265E-04 6.8141E-05 -3.9129E-05 1.3451E-05 S2 4.0138E-01 -4.2173E-02 3.1715E-03 -4.8961E-03 4.5485E-04 3.6416E-05 8.3417E-05 -3.0502E-05 2.3696E-06 S3 -3.8020E-02 -1.5612E-02 1.7940E-03 -9.0754E-04 4.1141E-04 -2.0779E-05 -5.0168E-06 -1.0798E-05 2.3431E-06 S4 2.2317E-02 8.4706E-03 3.2651E-03 1.4137E-03 6.3952E-04 3.1650E-04 1.7532E-04 8.0702E-05 2.6545E-05 S5 -5.7464E-03 -2.0557E-03 -2.8339E-04 -8.5043E-05 -1.3513E-06 -3.8592E-06 3.0581E-06 -3.5254E-06 1.8951E-06 S6 -1.2411E-01 -5.0428E-03 5.0546E-04 -2.9451E-04 -1.9589E-04 -2.7231E-05 -4.6696E-06 7.7408E-06 3.3942E-07 S7 -2.2575E-01 1.7303E-02 9.4882E-03 -5.5635E-04 -7.5915E-04 1.5924E-04 1.0929E-04 8.3075E-06 -2.5819E-05 S8 -1.2304E-01 3.0828E-02 7.9783E-03 -1.1536E-03 -2.3198E-04 3.4010E-04 5.6663E-05 1.2397E-05 -1.2924E-05 S9 3.4449E-02 6.6077E-03 -1.0669E-02 -2.1805E-03 -9.2903E-04 -2.6684E-04 -1.7978E-04 -4.1832E-05 -2.5146E-05 S10 3.4119E-01 7.2353E-02 -5.4784E-03 -2.9040E-03 -3.4498E-04 4.2064E-04 -3.7330E-05 -3.3121E-06 6.5229E-07

[0204] Table 30

[0205] AAS side AR BR CR DR ER FR GR HR JR S11 -2.9188E-01 1.6996E-01 -9.2489E-02 4.7623E-02 -1.8840E-02 4.8921E-03 -7.6499E-04 6.5078E-05 -2.3131E-06 S12 -1.0108E-01 3.9613E-02 -9.9773E-03 1.2503E-03 5.0576E-05 -4.5274E-05 6.8317E-06 -4.5167E-07 1.1392E-08

[0206] Table 31

[0207] AAS side AP BP CP DP EP FP GP HP JP S11 6.9851E-03 -3.2943E-04 -1.8037E-04 1.0131E-05 6.5423E-06 -1.4573E-06 3.4384E-06 4.4151E-06 0.0000E+00 S12 -2.5574E-03 -1.3411E-03 4.8017E-04 2.4666E-04 2.1191E-03 9.2797E-05 -7.4911E-05 -4.2385E-06 0.0000E+00

[0208] Table 32

[0209] Fig.16 The RMS spot diameter of the optical imaging system of Example 8 at different image height positions in the first quadrant is shown. Fig.16 The relationship between the RMS spot diameter and the real light image height is shown. Fig.16 In the table, the X real light height and Y real light height are both in millimeters (mm), the smallest RMS spot diameter is 0.0024515mm, the largest RMS spot diameter is 0.010593mm, the mean RMS spot diameter is 0.0044159mm, and the standard deviation of the RMS spot diameter is 0.0016578mm. Fig.16 It can be seen that the optical imaging system provided in Example 8 can achieve good imaging quality.

[0210] Example 9

[0211] The following reference Figure 17 to Figure 18 An optical imaging system according to Example 9 of the present application is described. Fig.17 A schematic structural diagram of an optical imaging system according to Example 9 of the present application is shown.

[0212] like Fig.17 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a filter E7.

[0213] The first lens E1 has negative focal power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging system has an imaging surface S15, and the light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0214] In Example 9, the effective focal length fx of the optical imaging system in the X-axis direction is 2.85 mm, the effective focal length fy of the optical imaging system in the Y-axis direction is 2.86 mm, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 5.89 mm, the value ImgH of half the diagonal length of the effective pixel area on the imaging surface S15 is 3.85 mm, and the value Semi-FOV of half the maximum field of view angle is 53.8°.

[0215] Table 33 shows the basic parameter table of the optical imaging system of Example 9, wherein the units of the radius of curvature Y, radius of curvature X, thickness / distance and focal length are all in millimeters (mm). Table 34 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 9, wherein each aspherical surface type can be defined by the formula (1) given in the above-mentioned Example 1. Tables 35 and 36 show the rotationally symmetric components and the high-order coefficients of the non-rotationally symmetric aspherical surfaces S11 and S12 that can be used in Example 9, wherein the non-rotationally symmetric aspherical surface type can be defined by the formula (2) given in the above-mentioned Example 1.

[0216]

[0217] Table 33

[0218] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 5.3353E-01 -5.5094E-02 1.2229E-02 -5.2998E-03 8.5453E-04 -4.6423E-04 6.5724E-05 -3.8386E-05 1.3279E-05 S2 4.0198E-01 -4.2107E-02 3.0930E-03 -4.8922E-03 4.5396E-04 3.6345E-05 8.3423E-05 -3.0415E-05 2.4255E-06 S3 -3.4100E-02 -1.5626E-02 1.7773E-03 -9.0102E-04 4.1950E-04 -1.7732E-05 -4.7138E-06 -1.1011E-05 2.2482E-06 S4 2.2822E-02 8.7434E-03 3.3167E-03 1.4483E-03 6.2898E-04 3.0503E-04 1.5725E-04 7.1010E-05 2.2868E-05 S5 -6.1662E-03 -1.9575E-03 -2.7284E-04 -7.6649E-05 4.2581E-07 -1.1652E-06 3.2202E-06 -2.5045E-06 1.5542E-06 S6 -1.2572E-01 -5.0487E-03 6.4159E-04 -2.6658E-04 -1.9606E-04 -2.0451E-05 -2.6607E-06 9.4822E-06 1.4823E-06 S7 -2.2543E-01 1.7002E-02 9.7144E-03 -6.7438E-04 -8.2340E-04 2.1360E-04 1.2043E-04 1.1288E-05 -2.9598E-05 S8 -1.2205E-01 3.0705E-02 7.7091E-03 -1.4257E-03 -1.0224E-04 4.8167E-04 9.7065E-05 2.1209E-05 -1.2878E-06 S9 3.2138E-02 8.4868E-03 -1.1580E-02 -1.7846E-03 -9.5891E-04 -2.3578E-04 -1.8101E-04 -4.0790E-05 -2.7836E-05 S10 3.4299E-01 7.1701E-02 -5.3136E-03 -2.8398E-03 -3.3770E-04 4.2231E-04 -3.7858E-05 -3.3567E-06 6.1603E-07

[0219] Table 34

[0220] AAS side AR BR CR DR ER FR GR HR JR S11 -2.9135E-01 1.7002E-01 -9.2490E-02 4.7623E-02 -1.8841E-02 4.8921E-03 -7.6499E-04 6.5078E-05 -2.3130E-06 S12 -1.0027E-01 3.9648E-02 -9.9776E-03 1.2499E-03 5.0542E-05 -4.5276E-05 6.8317E-06 -4.5167E-07 1.1392E-08

[0221] Table 35

[0222] AAS side AP BP CP DP EP FP GP HP JP S11 6.9814E-03 -3.3531E-04 -1.7740E-04 9.4718E-06 6.8115E-06 -1.7252E-06 3.4082E-06 5.3344E-06 0.0000E+00 S12 -1.7638E-03 -1.2269E-03 3.8791E-04 1.9674E-04 2.0446E-03 9.1156E-05 -6.6472E-05 -5.2688E-06 0.0000E+00

[0223] Table 36

[0224] Fig.18 The RMS spot diameter of the optical imaging system of Example 9 at different image height positions in the first quadrant is shown. Fig.18 The relationship between the RMS spot diameter and the real light image height is shown. Fig.18 In the table, the X real light height and Y real light height are both in millimeters (mm), the smallest RMS spot diameter is 0.0029131mm, the largest RMS spot diameter is 0.015048mm, the mean RMS spot diameter is 0.0048707mm, and the standard deviation of the RMS spot diameter is 0.0020129mm. Fig.18 It can be seen that the optical imaging system provided in Example 9 can achieve good imaging quality.

[0225] In summary, Examples 1 to 9 respectively satisfy the relationships shown in Table 37.

[0226] Conditional formula\Example 1 2 3 4 5 6 7 8 9 TLL / ImgH 1.58 1.58 1.57 1.56 1.58 1.58 1.57 1.54 1.53 T56 / CT5 0.68 0.61 0.74 0.77 0.91 0.92 0.59 0.61 0.57 fx / f3 1.18 1.02 1.01 1.00 1.06 1.05 0.89 0.83 0.82 fy / f1 -0.45 -0.47 -0.47 -0.47 -0.40 -0.38 -0.46 -0.47 -0.47 f5 / f6 -0.52 -0.51 -0.52 -0.55 -0.55 -0.49 -0.49 -0.68 -0.72 R1 / f1 0.72 0.72 0.74 0.74 0.66 0.65 0.73 0.73 0.73 R4 / R3 0.94 1.14 1.05 1.05 0.91 0.87 1.08 1.05 1.06 f3 / (R5-R6) 0.48 0.47 0.48 0.47 0.48 0.47 0.46 0.47 0.47 R10 / R7 0.54 0.52 0.50 0.36 0.31 0.39 0.38 0.18 0.22 R11 / (R11-R10) 0.54 0.55 0.58 0.60 0.59 0.56 0.56 0.57 0.57 (CT1+CT2) / (CT3+CT4) 0.99 0.84 0.79 0.82 0.82 0.85 0.78 1.02 1.02 CT6 / ΣAT 0.37 0.44 0.35 0.36 0.32 0.31 0.39 0.44 0.46 SAG41 / SAG61 0.81 0.87 0.74 0.69 0.75 0.72 0.86 0.78 0.83 DT41 / DT21 0.86 0.81 0.85 0.86 0.89 0.89 0.92 0.83 0.84 DT11 / DT62 0.48 0.51 0.55 0.55 0.55 0.55 0.56 0.55 0.55

[0227] Table 37

[0228] The present application also provides an imaging device, which is provided with an electronic photosensitive element for imaging, and the electronic photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0229] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of protection involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the present application. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical solution.

Claims

1. An optical imaging system, characterized in that: Along the optical axis from the object side to the image side, they include: The first lens has a negative optical power, and its object side surface is concave and its image side surface is concave; a second lens having optical power, wherein the object side surface is convex and the image side surface is concave; The third lens has positive power, and its object side surface is convex and its image side surface is convex; a fourth lens having optical power and having a concave object side surface; a fifth lens element having positive refractive power and having a convex image-side surface; a sixth lens having negative optical power, whose object side surface is convex and whose image side surface is concave; The signs of the optical power of the second lens and the fourth lens are the same in terms of positive and negative properties; or, the second lens has positive optical power, and the fourth lens has negative optical power; The number of lenses having optical power in the optical imaging system is six; At least one mirror surface from the object side surface of the first lens to the image side surface of the sixth lens is a non-rotationally symmetric aspherical surface; The distance TTL from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis and half the diagonal length of the effective pixel area on the imaging surface ImgH satisfy 1.53≤TTL / ImgH<1.6; The center thickness CT5 of the fifth lens on the optical axis and the spacing T56 between the fifth lens and the sixth lens on the optical axis satisfy 0.55<T56 / CT5<0.95; A sum of interval distances ΣAT between any two adjacent lenses from the first lens to the sixth lens on the optical axis and a center thickness CT6 of the sixth lens on the optical axis satisfy 0.3<CT6 / ΣAT<0.

5.

2. The optical imaging system according to claim 1, characterized in that: The effective focal length fx of the optical imaging system in the X-axis direction and the effective focal length f3 of the third lens satisfy 0.8<fx / f3<1.

2.

3. The optical imaging system according to claim 1, characterized in that: The effective focal length fy of the optical imaging system in the Y-axis direction and the effective focal length f1 of the first lens satisfy -0.50<fy / f1<-0.

35.

4. The optical imaging system according to claim 1, characterized in that: The effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy -0.75<f5 / f6<-0.

45.

5. The optical imaging system according to claim 1, characterized in that: An effective focal length f1 of the first lens and a curvature radius R1 of an object-side surface of the first lens satisfy 0.65≤R1 / f1≤0.

74.

6. The optical imaging system according to claim 1, characterized in that: A curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens satisfy 0.87≤R4 / R3≤1.

14.

7. The optical imaging system according to claim 1, characterized in that: An effective focal length f3 of the third lens, a curvature radius R5 of the object-side surface of the third lens, and a curvature radius R6 of the image-side surface of the third lens satisfy 0.46≤f3 / (R5-R6)<0.

5.

8. The optical imaging system according to claim 1, characterized in that: A curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R10 of the image-side surface of the fifth lens satisfy 0.15<R10 / R7<0.

55.

9. The optical imaging system according to claim 1, characterized in that: A curvature radius R10 of the image-side surface of the fifth lens and a curvature radius R11 of the object-side surface of the sixth lens satisfy 0.52<R11 / (R11-R10)<0.

62.

10. The optical imaging system according to claim 1, characterized in that: A center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, and a center thickness CT4 of the fourth lens on the optical axis satisfy 0.75<(CT1+CT2) / (CT3+CT4)<1.

05.

11. The optical imaging system according to claim 1, characterized in that: An on-axis distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the vertex of the effective radius of the object side surface of the fourth lens and an on-axis distance SAG61 from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective radius of the object side surface of the sixth lens satisfy 0.65<SAG41 / SAG61<0.

90.

12. The optical imaging system according to claim 1, characterized in that: The maximum effective radius DT21 of the object-side surface of the second lens and the maximum effective radius DT41 of the object-side surface of the fourth lens satisfy 0.80<DT41 / DT21<0.

95.

13. The optical imaging system according to claim 1, characterized in that: The maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT62 of the image-side surface of the sixth lens satisfy 0.45<DT11 / DT62<0.58.

Images