Optical imaging system

Abstract

The present application discloses an optical imaging system, which sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. Among them, the second lens has a positive optical power, and the third lens and the fifth lens have negative optical powers; the radius of curvature of the object side surface of the sixth lens is negative; the number of lenses with optical power in the optical imaging system is eight; the air gap between the seventh lens and the eighth lens on the optical axis is greater than the air gaps between any two adjacent lenses from the first lens to the seventh lens on the optical axis; the total effective focal length f of the optical imaging system and half of the maximum field angle Semi-FOV of the optical imaging system satisfy: tan(Semi-FOV)×f > 6 mm; the radius of curvature R11 of the object side surface of the sixth lens and the total effective focal length f of the optical imaging system satisfy: -8 < R11 / f < 0; and the air gap T12 between the first lens and the second lens on the optical axis and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 0.8 < T12 / T23 < 10.

Description

Technical Field

[0001] This application relates to the field of optical devices, and particularly to an eight-lens optical imaging system. Background Art

[0002] With the rapid development of portable devices such as smart phones, more new requirements are put forward for the imaging functions of portable devices such as smart phones. For example, through the optical design of the optical imaging system, the optical imaging system of portable devices such as smart phones can meet the requirement of a large field of view angle.

[0003] In the actual design process, in order to make the eight-lens optical imaging system meet the requirement of a large field of view angle, the eight-lens optical imaging system often has a large volume, which cannot ensure the thin and light characteristics of the eight-lens optical imaging system, thus affecting the product competitiveness of the eight-lens optical imaging system. Summary of the Invention

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

[0005] One aspect of this application provides such an optical imaging system, which sequentially includes, along the optical axis from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. Among them, the second lens has a positive optical power, the third lens and the fifth lens have negative optical powers; the radius of curvature of the object side of the sixth lens is negative; the number of lenses with optical power in the optical imaging system is eight; the air gap between the seventh lens and the eighth lens on the optical axis is greater than the air gap between any two adjacent lenses among the first lens to the seventh lens on the optical axis; the total effective focal length f of the optical imaging system and half of the maximum field of view angle Semi-FOV of the optical imaging system satisfy: tan(Semi-FOV)×f>6mm; the radius of curvature R_{11} of the object side of the sixth lens and the total effective focal length f of the optical imaging system satisfy: -8<R_{11} / f<0; and the air gap T_{12} between the first lens and the second lens on the optical axis and the air gap T_{23} between the second lens and the third lens on the optical axis satisfy: 0.8<T_{12} / T_{23}<10.

[0006] According to an exemplary embodiment of this application, the total effective focal length f of the optical imaging system, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f7 of the seventh lens satisfy: 0.9<(|f / f1|+|f / f3|) / (|f / f5|+|f / f7|)<1.8.

[0007] According to an exemplary embodiment of the present application, the curvature radii of the object-side surface and the image-side surface of the first lens and the second lens are both positive values, and the curvature radii from the object-side surface of the first lens to the image-side surface of the second lens increase gradually.

[0008] According to an exemplary embodiment of the present application, the curvature radius R1 of the object-side surface of the first lens, the curvature radius R2 of the image-side surface of the first lens, and the effective focal length f1 of the first lens satisfy: 0.2<(R1+R2) / f1<1.6.

[0009] According to an exemplary embodiment of the present application, an air interval T34 between the third lens and the fourth lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: 0.97≤T34 / CT4<3.

[0010] According to an exemplary embodiment of the present application, the seventh lens has positive refractive power, and the curvature radii of its object-side surface and image-side surface are both positive, the eighth lens has negative refractive power, and the effective focal length f7 of the seventh lens, the effective focal length f8 of the eighth lens, and the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens satisfy the following: -1.5<(f7-f8) / f456<0.

[0011] According to an exemplary embodiment of the present application, a curvature radius R13 of the object-side surface of the seventh lens, a curvature radius R14 of the image-side surface of the seventh lens, and a curvature radius R16 of the image-side surface of the eighth lens satisfy: 0<(R14-R13) / R16<2.

[0012] According to an exemplary embodiment of the present application, the distance TTL from the object side of the first lens to the imaging plane of the optical imaging system on the optical axis and half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system ImgH satisfy: TTL / ImgH<1.4.

[0013] According to an exemplary embodiment of the present application, half of the diagonal length ImgH of the effective pixel area on the imaging plane of the optical imaging system satisfies: ImgH>7mm.

[0014] According to an exemplary embodiment of the present application, the curvature radius R2 of the image side surface of the first lens, the curvature radius R4 of the image side surface of the second lens, the curvature radius R6 of the image side surface of the third lens, and the combined focal length f123 of the first lens, the second lens, and the third lens satisfy: 2<(R2+R4+R6) / f123<6.

[0015] According to an exemplary embodiment of the present application, a center thickness CT7 of the seventh lens on the optical axis, a center thickness CT8 of the eighth lens on the optical axis, and an air interval T78 between the seventh lens and the eighth lens on the optical axis satisfy: 0<(CT7+CT8) / T78<1.

[0016] According to an exemplary embodiment of the present application, the total effective focal length f of the optical imaging system, the effective focal length f2 of the second lens, the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens and the effective focal length f8 of the eighth lens satisfy: -2<(|f / f2|-|f / f4|) / (|f / f6|-|f / f8|)≤-0.18.

[0017] According to an exemplary embodiment of the present application, the minimum value minVa of the Abbe number of all lenses from the first lens to the third lens and the minimum value minVb of the Abbe number of all lenses from the sixth lens to the eighth lens satisfy: minVa <minVb。

[0018] According to an exemplary embodiment of the present application, a refractive index N1 of the first lens, a refractive index N2 of the second lens, a refractive index N3 of the third lens, a refractive index N6 of the sixth lens, a refractive index N7 of the seventh lens, and a refractive index N8 of the eighth lens satisfy: N1+N2+N3>N6+N7+N8.

[0019] According to an exemplary embodiment of the present application, the on-axis distance SAG62 from the intersection of the image side surface of the sixth lens and the optical axis to the effective half-aperture vertex of the image side surface of the sixth lens and the on-axis distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the effective half-aperture vertex of the image side surface of the fourth lens satisfy: 1 <SAG62 / SAG42<4。

[0020] According to an exemplary embodiment of the present application, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, the edge thickness ET7 of the seventh lens, and the edge thickness ET8 of the eighth lens satisfy the following conditions: <ET8 / (ET5+ET6+ET7)<1。

[0021] According to an exemplary embodiment of the present application, the first lens is a glass lens, and both the object-side surface and the image-side surface of the first lens are aspherical surfaces.

[0022] The present application limits the total effective focal length of the optical imaging system to half of the maximum field of view of the optical imaging system, and at the same time constrains the ratio of the air gap between the first lens and the second lens on the optical axis to the air gap between the second lens and the third lens on the optical axis within a certain range. This allows the optical imaging system to have a short total optical length while achieving a large field of view, ensuring that the optical imaging system is lightweight while meeting the requirements of a large field of view. At the same time, by constraining the curvature radius of the object-side surface of the sixth lens, the sixth lens can effectively correct the field curvature of the optical imaging system, thereby improving the imaging quality of the optical imaging system. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 1 1 shows a schematic structural diagram of an optical imaging system according to Example 1 of the present application;

[0025] Figures 2A to 2D axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system according to Example 1 of the present application are respectively shown;

[0026] Figure 3 1 shows a schematic structural diagram of an optical imaging system according to Example 2 of the present application;

[0027] Figures 4A to 4D axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system according to Example 2 of the present application are respectively shown;

[0028] Figure 5 1 shows a schematic structural diagram of an optical imaging system according to Example 3 of the present application;

[0029] 6A to 6D axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system according to Example 3 of the present application are respectively shown;

[0030] Figure 7 Schematic diagram of the structure of an optical imaging system according to Example 4 of the present application is shown;

[0031] Figures 8A to 8D axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system according to Example 4 of the present application are respectively shown;

[0032] Figure 9 1 shows a schematic structural diagram of an optical imaging system according to Example 5 of the present application;

[0033] 10A to 10D axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system according to Example 5 of the present application are respectively shown;

[0034] Figure 11 1 shows a schematic structural diagram of an optical imaging system according to Example 6 of the present application;

[0035] 12A to 12D axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system according to Example 6 of the present application are respectively shown;

[0036] Figure 131 shows a schematic structural diagram of an optical imaging system according to Example 7 of the present application;

[0037] 14A to 14D axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system according to Example 7 of the present application are respectively shown;

[0038] Figure 15 shows a schematic structural diagram of an optical imaging system according to Example 8 of the present application; and

[0039] 16A to 16D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging system according to Example 8 of the present application are respectively shown. DETAILED DESCRIPTION

[0040] In order 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 merely 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.

[0041] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

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

[0043] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0044] It should also be understood that the terms “comprises,” “including,” “having,” “includes,” and / or “comprising,” when used in this specification, indicate the presence of 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.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used herein 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.

[0046] It should be noted that, without conflict, the embodiments and features in the embodiments of this application may be combined with each other. The following will describe this application in detail with reference to the drawings and in conjunction with the embodiments.

[0047] The features, principles, and other aspects of this application will be described in detail below.

[0048] An optical imaging system according to an exemplary embodiment of this application may include a first lens, a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens, a fifth lens with a negative optical power, a sixth lens, a seventh lens, and an eighth lens. These eight lenses are arranged in sequence from the object side to the image side along the optical axis. Among the first lens to the eighth lens, there may be an air gap between any two adjacent lenses, and the air gap on the optical axis between the seventh lens and the eighth lens is greater than the air gap on the optical axis between any two adjacent lenses among the first lens to the seventh lens. The radius of curvature of the object side surface of the sixth lens is negative.

[0049] Among them, the total effective focal length f of the optical imaging system and half of the maximum field angle Semi - FOV of the optical imaging system may satisfy: tan(Semi - FOV)×f > 6mm; the radius of curvature R11 of the object side surface of the sixth lens and the total effective focal length f of the optical imaging system may satisfy: - 8 < R11 / f < 0; and the air gap T12 on the optical axis between the first lens and the second lens and the air gap T23 on the optical axis between the second lens and the third lens may satisfy: 0.8 < T12 / T23 < 10. While restricting the total effective focal length of the optical imaging system and half of the maximum field angle of the optical imaging system, this application constrains the ratio of the air gap on the optical axis between the first lens and the second lens to the air gap on the optical axis between the second lens and the third lens within a certain range, so that the optical imaging system has a short optical total length while achieving a large field angle, ensuring that the optical imaging system is thin and light while meeting the requirements of a large field angle; at the same time, by constraining the radius of curvature of the object side surface of the sixth lens, the sixth lens can effectively correct the field curvature of the optical imaging system, thereby improving the imaging quality of the optical imaging system.

[0050] In an exemplary embodiment, the first lens may be a glass lens, with both its object-side and image-side surfaces being aspherical. By configuring the first lens as a glass lens, the dispersion power of the first lens can be properly distributed, and the first lens can be used to balance the chromatic aberrations generated by other lenses, thereby fully correcting the aberrations of the optical imaging system and ensuring excellent imaging quality.

[0051] In an exemplary embodiment, the radii of curvature of the object-side and image-side surfaces of the first and second lenses are both positive, and the radii of curvature increase from the object-side surface of the first lens to the image-side surface of the second lens. By constraining the radii of curvature of the object-side and image-side surfaces of the first and second lenses, it is advantageous to adjust the focus position of light in the optical imaging system, improve the optical imaging system's ability to converge light, and effectively balance the optical imaging system's on-axis aberrations.

[0052] In an exemplary embodiment, the total effective focal length f of the optical imaging system, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f7 of the seventh lens may satisfy the following relationship: 0.9 < (|f / f1| + |f / f3|) / (|f / f5| + |f / f7|) < 1.8. Properly controlling the relationship between the effective focal lengths of the first, third, fifth, and seventh lenses and the total effective focal length of the optical imaging system facilitates the proper allocation of optical power among the lenses, better balances aberrations and temperature drift of the optical imaging system, and improves the resolution of the optical imaging system.

[0053] In an exemplary embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f1 of the first lens can satisfy the following relationship: 0.2 < (R1 + R2) / f1 < 1.6. Properly controlling the relationship between the radius of curvature of the object-side and image-side surfaces of the first lens and the effective focal length of the first lens facilitates controlling the angle of incidence of off-axis field light on the imaging plane.

[0054] In an exemplary embodiment, the air spacing T34 between the third and fourth lenses on the optical axis and the center thickness CT4 of the fourth lens on the optical axis may satisfy the following: 0.97 ≤ T34 / CT4 < 3. Properly controlling the relationship between the air spacing between the third and fourth lenses on the optical axis and the center thickness of the fourth lens on the optical axis ensures good machinability of the fourth lens while providing sufficient spacing and a higher degree of surface freedom for the optical imaging system.

[0055] In an exemplary embodiment, the seventh lens element may have positive optical power, with both its object-side and image-side radii of curvature being positive. The eighth lens element may have negative optical power. Furthermore, the effective focal length f7 of the seventh lens element, the effective focal length f8 of the eighth lens element, and the combined focal length f456 of the fourth, fifth, and sixth lenses may satisfy the following relationship: -1.5 < (f7 - f8) / f456 < 0. Properly controlling the relationship between the effective focal lengths of the seventh and eighth lenses and the combined focal lengths of the fourth, fifth, and sixth lenses facilitates reduced optical sensitivity and enables mass production of lenses.

[0056] In an exemplary embodiment, the radius of curvature R13 of the object-side surface of the seventh lens element, the radius of curvature R14 of the image-side surface of the seventh lens element, and the radius of curvature R16 of the image-side surface of the eighth lens element may satisfy the following relationship: 0 < (R14 - R13) / R16 < 2. Properly controlling the relationship between the radius of curvature of the object-side and image-side surfaces of the seventh lens element and the radius of curvature of the image-side surface of the eighth lens element facilitates better adjustment of the light focus position of the optical imaging system, enhances the optical imaging system's light converging capability, and effectively balances the optical imaging system's on-axis aberrations.

[0057] In an exemplary embodiment, the distance TTL on the optical axis from the object-side surface of the first lens to the imaging plane of the optical imaging system and half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system, ImgH, can satisfy the following relationship: TTL / ImgH<1.4. Properly controlling the relationship between the on-axis distance from the object-side surface of the first lens to the imaging plane of the optical imaging system and half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system facilitates achieving a large imaging height while shortening the overall optical length of the optical imaging system, ensuring that the optical imaging system meets the requirements of a large image plane and a thin and lightweight design.

[0058] In an exemplary embodiment, half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system, ImgH, can satisfy the following requirement: ImgH>7mm. By constraining half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system to a certain range, the optical imaging system can meet the requirement of a large image plane.

[0059] In an exemplary embodiment, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R4 of the image-side surface of the second lens, and the radius of curvature R6 of the image-side surface of the third lens, together with the combined focal length f123 of the first, second, and third lenses, may satisfy the following relationship: 2<(R2+R4+R6) / f123<6. Properly controlling the relationship between the radius of curvature of the image-side surfaces of the first, second, and third lenses and the combined focal length of the first, second, and third lenses facilitates balancing aberrations and improving the resolution of the optical imaging system.

[0060] In an exemplary embodiment, the central thickness CT7 of the seventh lens on the optical axis, the central thickness CT8 of the eighth lens on the optical axis, and the air gap T78 between the seventh lens and the eighth lens on the optical axis may satisfy: 0 < (CT7 + CT8) / T78 < 1. Reasonably controlling the relationship among the central thickness of the seventh lens on the optical axis, the central thickness of the eighth lens on the optical axis, and the air gap between the seventh lens and the eighth lens on the optical axis is beneficial to the injection molding of the seventh lens and the eighth lens, and while ensuring that the optical imaging system has good imaging quality, it improves the processability of the optical imaging system.

[0061] In an exemplary embodiment, the minimum value minVa of the Abbe numbers of all the lenses among the first lens to the third lens and the minimum value minVb of the Abbe numbers of all the lenses among the sixth lens to the eighth lens may satisfy: minVa < minVb. By constraining the ratio of the minimum value of the Abbe numbers of the first three lenses in the optical imaging system to the minimum value of the Abbe numbers of the last three lenses within a reasonable range, the size layout of the optical imaging system can be made more reasonable, the processability and the use stability of the optical imaging system can be improved, and at the same time, the chromatic aberration of the optical imaging system can be corrected to ensure that the optical imaging system has good imaging quality.

[0062] In an exemplary embodiment, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the refractive index N3 of the third lens, the refractive index N6 of the sixth lens, the refractive index N7 of the seventh lens, and the refractive index N8 of the eighth lens may satisfy: N1 + N2 + N3 > N6 + N7 + N8. By constraining the refractive indices of the first lens to the third lens and the refractive indices of the sixth lens to the eighth lens, it is beneficial to reasonably distribute the dispersion ability of the optical imaging system, correct the axial chromatic aberration and the lateral chromatic aberration of the optical imaging system, and improve the production yield of the optical imaging system.

[0063] In an exemplary embodiment, the axial distance SAG62 from the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective semi-aperture of the image side surface of the sixth lens and the axial distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the vertex of the effective semi-aperture of the image side surface of the fourth lens may satisfy: 1 < SAG62 / SAG42 < 4. By controlling the above conditional expression, it is beneficial to control the surface shapes of the image side surfaces of the fourth lens and the sixth lens, reduce the molding difficulty of the fourth lens and the sixth lens, and also avoid the optical imaging system from being too large or too small, realizing a high space utilization rate.

[0064] In an exemplary embodiment, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, the edge thickness ET7 of the seventh lens, and the edge thickness ET8 of the eighth lens may satisfy: 0 < ET8 / (ET5 + ET6 + ET7) < 1. Reasonably allocating the edge thicknesses of the fifth to eighth lenses is conducive to ensuring the processability and assembly characteristics of the fifth to eighth lenses, avoiding problems such as front and rear lens interference and matching caused by too small or too large edge thicknesses during the assembly process. At the same time, it can also help slow down light deflection, adjust the field curvature of the optical imaging system, reduce the sensitivity of the optical imaging system, and ensure that the optical imaging system has good imaging quality.

[0065] In an exemplary embodiment, the total effective focal length f of the optical imaging system, the effective focal length f2 of the second lens, the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens, and the effective focal length f8 of the eighth lens may satisfy: -2 < (|f / f2| - |f / f4|) / (|f / f6| - |f / f8|) ≤ -0.18. Reasonably controlling the mutual relationship between the effective focal lengths of the second, fourth, sixth, and eighth lenses and the total effective focal length of the optical imaging system is conducive to reasonably allocating the optical power of each lens, better balancing the aberrations of the optical imaging system, and improving the resolution of the optical imaging system.

[0066] In an exemplary embodiment, the optical imaging system may further include an aperture disposed between the object side and the first lens.

[0067] The optical imaging system according to the above embodiment of the present application may employ multiple lenses, such as the eight lenses described above. By reasonably allocating optical parameters such as the optical power, surface shape, central thickness of each lens, and the on-axis spacing between each lens, it is possible to achieve the thinning and large field angle of the optical imaging system, balance the on-axis aberrations of the optical imaging system, and improve the resolution, imaging quality, and production yield of the optical imaging system.

[0068] In an embodiment of the present application, at least one of the lens surfaces of each of the first to eighth lenses is an aspherical surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberrations that occur during imaging as much as possible, thereby improving the imaging quality.

[0069] However, those skilled in the art should understand that without departing from the technical solutions 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.

[0070] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0071] Example 1

[0072] The following reference Figures 1 to 2D An optical imaging system according to Example 1 of the present application is described.

[0073] like Figure 1 As shown, the optical imaging system 100 includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. A stop STO may be disposed between the object side and the first lens E1.

[0074] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative focal power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative focal power, with its object-side surface S15 being concave and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0075] Table 1 shows basic parameters of the optical imaging system 100 of Example 1, wherein the units of curvature radius, thickness / distance and focal length are all millimeters (mm).

[0076]

[0077]

[0078] Table 1

[0079] In Example 1, the object-side surface and the image-side surface of any lens from the first lens E1 to the eighth lens E8 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0080]

[0081] Wherein, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0082]

[0083]

[0084] Table 2

[0085] Figure 2A The axial chromatic aberration curve of the optical imaging system 100 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the system. Figure 2B The astigmatism curve of the optical imaging system 100 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 2C The distortion curve of the optical imaging system 100 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 2D The magnification chromatic aberration curve of the optical imaging system 100 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. Figures 2A to 2D It can be seen that the optical imaging system 100 can achieve good imaging quality.

[0086] Example 2

[0087] The following reference Figures 3 to 4D An optical imaging system according to Example 2 of the present application is described.

[0088] like Figure 3 As shown, the optical imaging system 200 includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. A stop STO may be disposed between the object side and the first lens E1.

[0089] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative focal power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative focal power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0090] Table 3 shows a basic parameter table of the optical imaging system 200 of Example 2, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0091]

[0092]

[0093] Table 3

[0094] In Example 2, the object side surface and the image side surface of any lens from the first lens E1 to the eighth lens E8 are all aspherical surfaces. Table 4 lists the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0095]

[0096]

[0097] Table 4

[0098] Figure 4A The axial chromatic aberration curve of the optical imaging system 200 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the system. Figure 4BThe astigmatism curve of the optical imaging system 200 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 4C The distortion curve of the optical imaging system 200 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4D The magnification chromatic aberration curve of the optical imaging system 200 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. Figures 4A to 4D It can be seen that the optical imaging system 200 can achieve good imaging quality.

[0099] Example 3

[0100] The following reference Figures 5 to 6D An optical imaging system according to Example 3 of the present application is described.

[0101] like Figure 5 As shown, the optical imaging system 300 includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. A stop STO may be disposed between the object side and the first lens E1.

[0102] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative focal power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0103] Table 5 shows a basic parameter table of the optical imaging system 300 of Example 3, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0104]

[0105]

[0106] Table 5

[0107] In Example 3, the object side surface and the image side surface of any lens from the first lens E1 to the eighth lens E8 are all aspherical surfaces. Table 6 lists the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0108] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.3371E-02 -1.5292E-02 -6.3385E-03 -2.1405E-03 -6.2555E-04 -1.2554E-04 -1.5346E-05 S2 -1.8086E-01 3.2486E-03 -1.7733E-03 -3.5281E-04 1.9504E-04 1.2630E-04 1.2534E-04 S3 -2.5087E-01 2.7428E-02 -4.7168E-04 -8.0273E-04 2.5816E-04 -2.4681E-05 8.0034E-05 S4 -1.2401E-01 1.6410E-02 -3.9876E-03 -9.0274E-04 -1.7138E-04 2.6878E-05 2.1814E-04 S5 7.0266E-02 8.8908E-03 7.3365E-04 -1.3768E-04 -4.6977E-04 -5.5521E-05 4.5750E-05 S6 8.7639E-02 1.1765E-02 3.9202E-03 6.0743E-04 -6.6754E-05 -7.9485E-06 1.1368E-05 S7 -1.3501E-01 -9.5785E-03 2.1416E-03 9.3276E-04 1.2103E-04 -1.7509E-05 2.0420E-05 S8 -2.4427E-01 -9.0235E-03 3.6715E-03 -1.7213E-03 -1.8029E-03 -8.4903E-04 3.9609E-05 S9 -4.8280E-01 1.8545E-02 -3.5025E-03 -1.3401E-02 -5.1546E-03 -1.2463E-03 1.0480E-03 S10 -7.4029E-01 3.5500E-02 1.0395E-02 -1.4159E-02 -3.2201E-03 -1.0123E-03 1.4961E-03 S11 -5.4124E-01 -1.9258E-01 4.8686E-02 1.0769E-02 6.8222E-03 -2.9057E-03 -3.7986E-03 S12 -9.2430E-01 2.1143E-01 -1.4689E-02 -5.5383E-03 -7.1067E-03 5.1053E-03 1.7280E-04 S13 -6.5898E+00 1.6000E+00 -3.4938E-01 3.9266E-02 1.8874E-02 -6.2643E-03 -3.4284E-03 S14 -4.1325E+00 7.6832E-01 -1.4756E-01 2.7134E-03 6.0121E-02 -6.0079E-02 2.3040E-02 S15 -3.0561E+00 1.5194E+00 -8.6411E-01 3.9174E-01 -1.4482E-01 2.6074E-02 1.7366E-02 S16 -8.5817E+00 1.8508E+00 -7.0587E-01 2.9226E-01 -1.2478E-01 3.2801E-02 -1.7743E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.1605E-05 5.2903E-06 7.0572E-06 2.1679E-06 2.1225E-06 -3.4657E-07 6.8293E-07 S2 1.1181E-04 8.4595E-05 6.0176E-05 4.0051E-05 2.2640E-05 1.0685E-05 3.5999E-06 S3 9.5024E-05 5.3372E-05 4.7730E-05 3.7882E-05 2.7923E-05 1.3304E-05 4.8315E-06 S4 1.2104E-04 7.1419E-05 5.6561E-05 4.0630E-05 2.0884E-05 6.5521E-06 -2.7813E-07 S5 5.3902E-06 -2.4459E-06 -3.0048E-07 -7.8612E-07 -8.3887E-07 -8.1727E-07 -3.6752E-07 S6 3.1668E-06 3.9789E-06 1.7413E-06 2.0084E-06 -3.5333E-07 -3.5840E-07 -7.1158E-07 S7 1.5583E-05 1.2467E-05 5.3646E-06 2.0413E-06 2.4965E-06 7.0481E-07 1.4069E-06 S8 5.4796E-05 5.8023E-05 1.9912E-05 1.7129E-05 1.1421E-05 6.5743E-06 2.9890E-06 S9 5.2856E-04 3.9244E-04 2.8699E-04 1.9084E-04 8.5913E-05 2.6595E-05 7.4469E-06 S10 1.0314E-04 -2.1231E-04 -3.7753E-04 -2.7873E-04 -1.6506E-04 -5.8501E-05 -1.0329E-05 S11 -3.1365E-03 -5.2792E-04 8.3296E-04 1.1749E-03 7.5774E-04 3.1842E-04 8.5648E-05 S12 -9.3759E-04 3.3439E-04 1.5577E-04 1.5923E-04 -2.8360E-05 7.1242E-05 3.5373E-05 S13 4.3887E-03 -1.0880E-03 -2.2386E-03 -7.6976E-04 9.3998E-04 5.4530E-04 -2.5352E-04 S14 -8.8332E-03 2.3553E-03 8.3019E-04 1.2773E-03 -1.7852E-03 8.3227E-04 -1.4195E-04 S15 -2.4469E-03 -2.4688E-03 4.5906E-03 -3.7773E-03 -1.1283E-03 3.3068E-04 -9.0392E-04 S16 4.7827E-03 -6.3583E-03 3.2253E-03 -1.5108E-03 2.9438E-04 1.7536E-04 -1.0415E-04

[0109] Table 6

[0110] Figure 6A The axial chromatic aberration curve of the optical imaging system 300 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the system. Figure 6B The astigmatism curve of the optical imaging system 300 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 6C The distortion curve of the optical imaging system 300 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 6D The magnification chromatic aberration curve of the optical imaging system 300 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. 6A to 6D It can be seen that the optical imaging system 300 can achieve good imaging quality.

[0111] Example 4

[0112] The following reference Figures 7 to 8D An optical imaging system according to Example 4 of the present application is described.

[0113] like Figure 7 As shown, the optical imaging system 400 includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. A stop STO may be disposed between the object side and the first lens E1.

[0114] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative focal power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative focal power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0115] Table 7 shows a basic parameter table of the optical imaging system 400 of Example 4, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0116]

[0117] Table 7

[0118] In Example 4, the object side surface and the image side surface of any lens from the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 8 lists the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0119]

[0120]

[0121] Table 8

[0122] Figure 8A The axial chromatic aberration curve of the optical imaging system 400 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the system. Figure 8B The astigmatism curve of the optical imaging system 400 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 8CThe distortion curve of the optical imaging system 400 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 8D The magnification chromatic aberration curve of the optical imaging system 400 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. Figures 8A to 8D It can be seen that the optical imaging system 400 can achieve good imaging quality.

[0123] Example 5

[0124] The following reference Figures 9 to 10D An optical imaging system according to Example 5 of the present application is described.

[0125] like Figure 9 As shown, the optical imaging system 500 includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. A stop STO may be disposed between the object side and the first lens E1.

[0126] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative focal power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0127] Table 9 shows a basic parameter table of the optical imaging system 500 of Example 5, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0128]

[0129] Table 9

[0130] In Example 5, the object side surface and the image side surface of any lens from the first lens E1 to the eighth lens E8 are all aspherical surfaces. Table 10 lists the high-order coefficients A4, A6, A8, A 10 、A12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0131]

[0132]

[0133] Table 10

[0134] Figure 10A The axial chromatic aberration curve of the optical imaging system 500 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the system. Figure 10B The astigmatism curve of the optical imaging system 500 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 10C The distortion curve of the optical imaging system 500 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 10D The magnification chromatic aberration curve of the optical imaging system 500 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. 10A to 10D It can be seen that the optical imaging system 500 can achieve good imaging quality.

[0135] Example 6

[0136] The following reference Figures 11 to 12D An optical imaging system according to Example 6 of the present application is described.

[0137] like Figure 11 As shown, the optical imaging system 600 includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. A stop STO may be disposed between the object side and the first lens E1.

[0138] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative focal power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative focal power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative focal power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0139] Table 11 shows a basic parameter table of the optical imaging system 600 of Example 6, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0140]

[0141]

[0142] Table 11

[0143] In Example 6, the object side surface and the image side surface of any lens from the first lens E1 to the eighth lens E8 are all aspherical surfaces. Table 12 lists the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0144]

[0145]

[0146] Table 12

[0147] Figure 12A The axial chromatic aberration curve of the optical imaging system 600 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the system. Figure 12BThe astigmatism curve of the optical imaging system 600 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 12C The distortion curve of the optical imaging system 600 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 12D The magnification chromatic aberration curve of the optical imaging system 600 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. 12A to 12D It can be seen that the optical imaging system 600 can achieve good imaging quality.

[0148] Example 7

[0149] The following reference Figures 13 to 14D An optical imaging system according to Example 7 of the present application is described.

[0150] like Figure 13 As shown, the optical imaging system 700 includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. A stop STO may be disposed between the object side and the first lens E1.

[0151] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative focal power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative focal power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0152] Table 13 shows a basic parameter table of the optical imaging system 700 of Example 7, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0153]

[0154]

[0155] Table 13

[0156] In Example 7, the object side surface and the image side surface of any lens from the first lens E1 to the eighth lens E8 are all aspherical surfaces. Table 14 lists the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0157] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.7618E-02 -1.5950E-02 -5.7378E-03 -1.6945E-03 -3.2708E-04 4.3238E-05 1.3214E-04 S2 -1.8261E-01 1.1098E-03 8.3183E-04 -3.5596E-04 3.8310E-04 4.2243E-04 2.7087E-04 S3 -2.4775E-01 2.3262E-02 -1.1859E-03 -1.3404E-03 7.3059E-04 3.4074E-04 2.2714E-04 S4 -1.2660E-01 7.6451E-03 -3.5391E-03 -1.8026E-04 2.3796E-06 -1.8549E-04 3.1134E-05 S5 7.3310E-02 8.5043E-03 3.0339E-03 1.2070E-03 -3.9066E-04 -2.0075E-04 -5.3289E-05 S6 9.0698E-02 1.3332E-02 4.6757E-03 1.3546E-03 1.1514E-04 3.2608E-05 2.6200E-05 S7 -1.2868E-01 -1.2980E-02 1.2808E-03 1.6869E-03 3.8495E-04 1.8165E-04 8.3544E-05 S8 -2.3922E-01 -2.0460E-02 7.2131E-03 1.4754E-03 -4.5165E-04 -4.7866E-04 6.1041E-04 S9 -5.0893E-01 1.3044E-02 3.3308E-03 -1.5328E-02 -5.2607E-03 -5.1186E-04 2.7999E-03 S10 -6.9246E-01 4.2933E-02 1.2773E-02 -2.2491E-02 -1.1719E-03 9.7616E-04 2.4238E-03 S11 -5.4424E-01 -1.5399E-01 5.3401E-02 6.7701E-03 7.6952E-03 -2.2893E-03 -4.1201E-03 S12 -9.3735E-01 1.9075E-01 -2.1496E-02 -1.3101E-03 -1.1404E-03 3.3765E-03 -3.6656E-03 S13 -6.5133E+00 1.6671E+00 -3.7187E-01 1.4199E-02 2.7124E-02 -7.3794E-03 -7.1472E-03 S14 -4.4003E+00 7.6266E-01 -1.9634E-01 3.8846E-02 5.0020E-02 -4.7665E-02 1.4054E-02 S15 -3.0611E+00 1.4849E+00 -8.7354E-01 4.2553E-01 -1.3367E-01 1.0480E-02 2.6630E-02 S16 -8.6203E+00 2.0495E+00 -6.5209E-01 2.8575E-01 -1.2192E-01 3.8939E-02 -1.2573E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.2443E-04 9.3993E-05 5.9619E-05 3.0142E-05 1.0765E-05 -3.5869E-07 -2.6501E-06 S2 1.4307E-04 4.9020E-05 -7.8969E-06 -2.8502E-05 -2.5860E-05 -1.0076E-05 -1.2835E-06 S3 2.0604E-04 1.0359E-04 3.4019E-05 -1.1277E-05 -2.2786E-05 -2.3119E-05 -7.6804E-06 S4 5.6657E-05 2.1196E-05 -2.7241E-05 -5.4641E-05 -5.6483E-05 -3.3810E-05 -1.1565E-05 S5 -3.5148E-05 -1.3356E-05 -3.4930E-06 -4.0313E-06 -9.8506E-06 -1.2766E-05 -6.9195E-06 S6 6.0192E-07 5.0647E-06 2.1982E-07 7.5762E-07 -3.7675E-06 -9.4745E-07 -1.1258E-06 S7 7.7743E-05 2.6130E-05 2.5397E-05 -3.0750E-06 8.7857E-06 -3.1663E-06 4.6932E-06 S8 3.6392E-04 2.1383E-04 2.8036E-05 1.6907E-05 6.1208E-06 1.0952E-05 4.1873E-07 S9 8.2918E-04 6.5396E-05 5.6954E-06 1.8774E-04 1.0936E-04 1.6399E-05 -1.3295E-05 S10 -1.0123E-03 -6.5986E-04 -6.9285E-05 1.7759E-04 -2.8884E-05 -9.2339E-05 -4.5385E-05 S11 -3.2143E-03 -6.0482E-04 6.4907E-04 9.6865E-04 6.3776E-04 3.0366E-04 6.4728E-05 S12 -9.7326E-05 4.9689E-04 -1.2384E-04 -2.3457E-04 2.6728E-06 8.1972E-05 -1.5050E-05 S13 6.3910E-03 -2.7278E-03 1.6286E-03 -5.4021E-04 2.2120E-04 8.2210E-05 1.3252E-04 S14 1.8735E-03 -5.2234E-03 1.8465E-03 1.5815E-03 -1.4048E-03 -5.5253E-04 1.9207E-05 S15 -5.1522E-03 -7.9557E-03 9.3103E-03 -5.4916E-03 -1.6521E-03 -1.7247E-05 -1.0715E-03 S16 1.3048E-02 -6.8761E-03 6.1178E-03 -2.4567E-03 1.2286E-03 5.3987E-04 -5.3506E-05

[0158] Table 14

[0159] Figure 14A The axial chromatic aberration curve of the optical imaging system 700 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the system. Figure 14B The astigmatism curve of the optical imaging system 700 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 14C The distortion curve of the optical imaging system 700 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 14D The magnification chromatic aberration curve of the optical imaging system 700 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. 14A to 14D It can be seen that the optical imaging system 700 can achieve good imaging quality.

[0160] Example 8

[0161] The following reference Figures 15 to 16D An optical imaging system according to Example 8 of the present application is described.

[0162] like Figure 15 As shown, the optical imaging system 800 includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. A stop STO may be disposed between the object side and the first lens E1.

[0163] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative focal power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative focal power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0164] Table 15 shows a basic parameter table of the optical imaging system 800 of Example 8, wherein the units of curvature radius, thickness / distance and focal length are all millimeters (mm).

[0165]

[0166] Table 15

[0167] In Example 8, the object side surface and the image side surface of any lens from the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 16 lists the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0168] Face number A4 A6 A8 A10 A12 A14 A16 S1 -4.1533E-02 -1.8653E-02 -7.3421E-03 -2.4161E-03 -7.4707E-04 -1.5971E-04 -1.8077E-05 S2 -1.7855E-01 9.8478E-04 -7.9435E-04 -4.9780E-04 3.5342E-04 3.7687E-04 3.3653E-04 S3 -2.0955E-01 1.9068E-02 -7.7170E-04 -7.3790E-04 2.3327E-04 -6.0426E-05 -9.0906E-06 S4 -1.3076E-01 8.3833E-03 -2.6181E-03 -1.4245E-04 -1.3427E-04 -1.3448E-04 1.0530E-04 S5 7.7281E-02 8.1417E-03 3.3582E-03 7.2682E-04 -4.5239E-04 -9.5572E-05 4.8438E-05 S6 9.2932E-02 1.3125E-02 4.5522E-03 1.0673E-03 1.7347E-06 -2.0474E-06 1.2936E-05 S7 -1.5021E-01 -1.2296E-02 8.1052E-04 1.1709E-03 2.5814E-04 3.3552E-05 2.4770E-06 S8 -2.8245E-01 -1.8716E-02 4.6263E-03 1.6367E-03 -6.2349E-04 -7.5312E-04 -5.9869E-05 S9 -5.2610E-01 2.1843E-02 1.3550E-03 -1.4065E-02 -6.3006E-03 -1.4255E-03 2.2980E-03 S10 -6.9613E-01 4.3307E-02 7.4131E-03 -2.0586E-02 -1.6884E-03 8.3039E-04 2.6442E-03 S11 -5.7019E-01 -1.3722E-01 4.2666E-02 1.5891E-02 8.4726E-03 -2.8554E-03 -6.2186E-03 S12 -9.5787E-01 2.0239E-01 -1.6231E-02 7.4861E-03 -5.8027E-03 7.7561E-04 -3.1434E-03 S13 -6.5512E+00 1.6520E+00 -3.5786E-01 9.8162E-03 3.0421E-02 -1.1132E-02 -5.1053E-03 S14 -4.2957E+00 7.3754E-01 -1.8504E-01 2.9289E-02 5.9168E-02 -5.4373E-02 1.9748E-02 S15 -3.0634E+00 1.5107E+00 -8.6815E-01 4.2681E-01 -1.4408E-01 8.2627E-03 1.8786E-02 S16 -8.7384E+00 1.9771E+00 -6.6766E-01 3.0091E-01 -1.1739E-01 3.4656E-02 -1.3683E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 4.4315E-05 4.1022E-05 4.5064E-05 2.9122E-05 2.4224E-05 1.0643E-05 5.9345E-06 S2 2.5703E-04 1.7296E-04 1.0186E-04 5.5678E-05 2.3236E-05 6.0025E-06 -1.2882E-06 S3 2.2697E-05 4.7159E-06 1.4446E-06 -3.7737E-06 -7.4421E-07 2.2216E-07 6.7449E-07 S4 2.5359E-05 4.1019E-06 4.8091E-06 1.0247E-05 6.6014E-06 5.2675E-06 -5.2639E-07 S5 3.1933E-06 -5.8092E-06 -1.3114E-06 -3.7742E-08 1.6276E-06 8.3031E-07 6.9827E-07 S6 5.2212E-06 2.4584E-06 2.7472E-06 7.4453E-07 -3.7942E-07 -8.7204E-07 1.6749E-09 S7 7.1957E-06 5.0076E-06 7.5188E-06 3.2884E-08 2.7545E-06 -9.7597E-07 1.1899E-06 S8 6.8283E-05 8.5824E-05 3.4374E-05 1.7637E-05 8.0547E-06 6.2227E-06 3.4931E-06 S9 1.7241E-03 1.0625E-03 6.5523E-04 4.6997E-04 2.4420E-04 9.0860E-05 1.7011E-05 S10 -2.1189E-04 -8.3158E-04 -8.0616E-04 -4.0535E-04 -2.4306E-04 -9.0381E-05 -3.0880E-05 S11 -3.9604E-03 -1.1856E-04 1.3790E-03 1.5682E-03 9.2417E-04 3.8866E-04 8.9890E-05 S12 -5.7318E-05 1.1285E-03 1.5036E-04 2.3692E-04 2.0928E-04 1.8717E-04 3.2419E-05 S13 5.7531E-03 -4.0817E-04 2.8033E-04 -5.9881E-04 6.6135E-04 1.2154E-03 -2.4388E-04 S14 -3.6811E-04 -2.2587E-03 1.8940E-03 4.8947E-04 -4.7834E-03 -1.8433E-03 -9.5613E-04 S15 -1.4758E-03 -1.0795E-03 8.9320E-03 -8.2683E-04 -1.5477E-03 9.6039E-04 -1.9887E-04 S16 4.8776E-03 -7.1369E-03 3.4006E-03 -9.8131E-04 9.6013E-04 7.2760E-04 -2.6101E-04

[0169] Table 16

[0170] Figure 16A The axial chromatic aberration curve of the optical imaging system 800 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the system. Figure 16B An astigmatism curve of the optical imaging system 800 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 16C A distortion curve of the optical imaging system 800 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 16D The magnification chromatic aberration curve of the optical imaging system 800 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. 16A to 16D It can be seen that the optical imaging system 800 can achieve good imaging quality.

[0171] Table 17 schematically shows some basic parameters in Examples 1 to 8.

[0172]

[0173]

[0174] Table 17

[0175] In summary, the conditional expressions in Examples 1 to 8 satisfy the relationship shown in Table 18.

[0176] Conditional formula / Example 1 2 3 4 5 6 7 8 tan(Semi-FOV)×f 8.23 8.16 7.10 7.01 6.69 8.01 7.62 7.75 R11 / f -1.75 -2.55 -1.91 -1.94 -2.03 -2.25 -3.43 -3.49 T12 / T23 6.10 2.41 1.60 1.70 1.72 1.48 1.68 1.90 (|f / f1|+|f / f3|) / (|f / f5|+|f / f7|) 1.39 1.43 1.18 1.15 1.11 1.16 1.27 1.21 (R1+R2) / f1 0.82 0.81 0.94 0.93 0.88 0.79 0.91 0.97 T34 / CT4 1.06 1.00 1.23 1.32 1.44 1.05 0.97 1.17 (f7-f8) / f456 -0.52 -0.17 -0.62 -0.65 -0.68 -0.53 -0.22 -0.29 (R14-R13) / R16 0.58 0.62 1.06 1.05 1.21 0.64 0.67 0.82 TTL / ImgH 1.06 1.08 1.06 1.06 1.06 1.06 1.04 1.05 (R2+R4+R6) / f123 3.87 3.18 3.43 3.74 3.97 4.62 3.55 3.54 (CT7+CT8) / T78 0.95 0.92 0.87 0.86 0.85 0.89 0.79 0.90 SAG62 / SAG42 3.34 2.97 1.59 1.58 1.46 2.15 3.00 2.63 ET8 / (ET5+ET6+ET7) 0.44 0.60 0.44 0.56 0.75 0.59 0.71 0.62 (|f / f2|-|f / f4|) / (|f / f6|-|f / f8|) -0.35 -0.21 -0.46 -0.47 -0.53 -0.33 -0.18 -0.21

[0177] Table 18

[0178] The present application also provides an imaging device, wherein the electronic photosensitive element thereof can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0179] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging system, characterized in that The optical system includes, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein: The first lens has positive refractive power, and the curvature radii of the object side and the image side are both positive; The second lens has positive refractive power, and the curvature radii of the object side surface and the image side surface are both positive; The third lens has negative optical power, and the curvature radius of its image side surface is positive; The fourth lens has positive optical power, The fifth lens has negative optical power, The sixth lens has negative optical power, and the radius of curvature of the object side surface thereof is negative; The seventh lens has positive refractive power, and the curvature radii of its object-side surface and image-side surface are both positive; The eighth lens has negative optical power, and the curvature radius of its image side surface is positive; The number of lenses having optical power in the optical imaging system is eight; The air interval between the seventh lens and the eighth lens on the optical axis is greater than the air interval between any two adjacent lenses from the first lens to the seventh lens on the optical axis; The total effective focal length f of the optical imaging system and half of the maximum field of view (Semi-FOV) of the optical imaging system satisfy the following conditions: 6.69 mm ≤ tan (Semi-FOV) × f ≤ 8.23 ​​mm; The curvature radius R11 of the object-side surface of the sixth lens and the total effective focal length f of the optical imaging system satisfy the following conditions: -3.49≤R11 / f≤-1.75; an air interval T12 between the first lens and the second lens on the optical axis and an air interval T23 between the second lens and the third lens on the optical axis satisfy the following: 1.48≤T12 / T23≤6.10; and A center thickness CT7 of the seventh lens on the optical axis, a center thickness CT8 of the eighth lens on the optical axis, and an air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy the following: 0.79≤(CT7+CT8) / T78≤0.

95.

2. The optical imaging system according to claim 1, wherein: The total effective focal length f of the optical imaging system, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens and the effective focal length f7 of the seventh lens satisfy: 1.11≤(|f / f1|+|f / f3|) / (|f / f5|+|f / f7|)≤1.

43.

3. The optical imaging system according to claim 1, wherein: The curvature radius from the object side surface of the first lens to the image side surface of the second lens increases gradually.

4. The optical imaging system according to claim 3, wherein: A curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, and an effective focal length f1 of the first lens satisfy: 0.79≤(R1+R2) / f1≤0.

97.

5. The optical imaging system according to claim 1, wherein: An air gap T34 between the third lens and the fourth lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy the following: 0.97≤T34 / CT4≤1.

44.

6. The optical imaging system according to claim 1, wherein: The effective focal length f7 of the seventh lens, the effective focal length f8 of the eighth lens, and the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens satisfy the following: -0.68≤(f7-f8) / f456≤-0.

17.

7. The optical imaging system according to claim 6, wherein: A curvature radius R13 of the object-side surface of the seventh lens, a curvature radius R14 of the image-side surface of the seventh lens, and a curvature radius R16 of the image-side surface of the eighth lens satisfy: 0.58≤(R14-R13) / R16≤1.

21.

8. The optical imaging system according to claim 1, wherein: The 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 the diagonal length of the effective pixel area on the imaging surface of the optical imaging system ImgH satisfy the following: 1.04≤TTL / ImgH≤1.

08.

9. The optical imaging system according to claim 8, wherein: Half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging system satisfies the following: 7mm<ImgH≤8.42mm.

10. The optical imaging system according to claim 1, wherein: The curvature radius R2 of the image side surface of the first lens, the curvature radius R4 of the image side surface of the second lens, the curvature radius R6 of the image side surface of the third lens, and the combined focal length f123 of the first lens, the second lens, and the third lens satisfy: 3.18≤(R2+R4+R6) / f123≤4.

62.

11. The optical imaging system according to claim 1, wherein: The total effective focal length f of the optical imaging system, the effective focal length f2 of the second lens, the effective focal length f4 of the fourth lens, the effective focal length f6 of the sixth lens and the effective focal length f8 of the eighth lens satisfy: -0.53≤(|f / f2|-|f / f4|) / (|f / f6|-|f / f8|)≤-0.

18.

12. The optical imaging system according to any one of claims 1 to 11, characterized in that: The minimum value minVa of the Abbe number of all lenses from the first lens to the third lens and the minimum value minVb of the Abbe number of all lenses from the sixth lens to the eighth lens satisfy: minVa <minVb。 13. The optical imaging system according to any one of claims 1 to 11, characterized in that: A refractive index N1 of the first lens, a refractive index N2 of the second lens, a refractive index N3 of the third lens, a refractive index N6 of the sixth lens, a refractive index N7 of the seventh lens, and a refractive index N8 of the eighth lens satisfy: N1+N2+N3>N6+N7+N8.

14. The optical imaging system according to any one of claims 1 to 11, characterized in that: The on-axis distance SAG62 from the intersection of the image side surface of the sixth lens and the optical axis to the effective half-aperture vertex of the image side surface of the sixth lens and the on-axis distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the effective half-aperture vertex of the image side surface of the fourth lens satisfy: 1.46≤SAG62 / SAG42≤3.

34.

15. The optical imaging system according to any one of claims 1 to 11, characterized in that: An edge thickness ET5 of the fifth lens, an edge thickness ET6 of the sixth lens, an edge thickness ET7 of the seventh lens, and an edge thickness ET8 of the eighth lens satisfy the following: 0.44≤ET8 / (ET5+ET6+ET7)≤0.

75.

16. The optical imaging system according to any one of claims 1 to 11, characterized in that: The first lens is a glass lens, and both the object-side surface and the image-side surface of the first lens are aspherical surfaces.

Images