Camera optical system

Abstract

The present application discloses a camera optical system, which includes, in order 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 and a sixth lens. The first lens has positive optical power, its object side surface is convex, and its image side surface is concave; the second lens has negative optical power, its object side surface is convex, and its image side surface is concave; the third lens has optical power; the fourth lens has optical power; the fifth lens has positive optical power; the sixth lens has negative optical power, and its object side surface is concave. The distance TTL from the object side surface of the first lens to the imaging surface of the camera optical system on the optical axis and the half of the diagonal length of the effective pixel area on the imaging surface of the camera optical system ImgH satisfy TTL / ImgH<1.5.

Description

Technical Field

[0001] The present application relates to an imaging optical system, and more particularly, to an imaging optical system including six lenses. Background Art

[0002] With the advancement of science and technology, electronic products with camera functions are developing rapidly, and people's requirements for camera optical systems suitable for portable electronic products are gradually increasing. At the same time, with the advancement of image sensor technologies such as charge coupled device (CCD) or complementary metal oxide semiconductor (CMOS), the number of pixels on the chip has increased while the size of a single pixel has decreased, which has put forward higher and higher requirements for the high imaging performance of the camera optical system used in conjunction with it.

[0003] Therefore, a camera optical system with large image surface, large aperture, and ultra-thinness is needed. Summary of the invention

[0004] The present application provides an imaging optical system that is applicable to portable electronic products and can at least solve or partially solve at least one of the above-mentioned shortcomings in the prior art.

[0005] On the one hand, the present application provides such a camera optical system, which includes, in order 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 and a sixth lens. Among them, the first lens may have positive optical power, its object side surface may be convex, and its image side surface may be concave; the second lens may have negative optical power, its object side surface may be convex, and its image side surface may be concave; the third lens has optical power; the fourth lens has optical power; the fifth lens may have positive optical power; the sixth lens may have negative optical power, and its object side surface may be concave. Among them, the distance TTL from the object side surface of the first lens to the imaging surface of the camera optical system on the optical axis and the half of the diagonal length of the effective pixel area on the imaging surface of the camera optical system ImgH may satisfy TTL / ImgH<1.5.

[0006] In one embodiment, the total effective focal length f of the imaging optical system and the maximum half field of view HFOV of the imaging optical system may satisfy 4.6 mm<f*tan(HFOV)<7 mm.

[0007] In one embodiment, the effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens may satisfy -2.5<f1 / f6<-1.5.

[0008] In one embodiment, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens may satisfy -2.5<f2 / (f5*2)<-1.5.

[0009] In one embodiment, a curvature radius R1 of the object-side surface of the first lens and a curvature radius R4 of the image-side surface of the second lens may satisfy 1<R4 / R1<2.

[0010] In one embodiment, a curvature radius R3 of the object-side surface of the second lens and a curvature radius R11 of the object-side surface of the sixth lens may satisfy -2.5<R3 / R11<-1.

[0011] In one embodiment, a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis may satisfy 1<CT1 / (CT2+CT3)<1.5.

[0012] In one embodiment, a distance T56 between the fifth lens and the sixth lens on the optical axis and a distance T23 between the second lens and the third lens on the optical axis may satisfy 0.6<T56 / T23<1.2.

[0013] In one embodiment, an axial distance SAG52 from the intersection of the image side surface of the fifth lens and the optical axis to the effective half-aperture vertex of the image side surface of the fifth lens and a center thickness CT5 of the fifth lens on the optical axis may satisfy 1<|SAG52 / CT5|<1.5.

[0014] In one embodiment, an edge thickness ET6 of the sixth lens and a center thickness CT6 of the sixth lens on the optical axis may satisfy 1<ET6 / CT6<2.

[0015] In one embodiment, the total effective focal length f of the imaging optical system and the entrance pupil diameter EPD of the imaging optical system may satisfy f / EPD<1.8.

[0016] On the other hand, the present application provides such an imaging optical system, which includes, in order 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 and a sixth lens. Among them, the first lens may have positive optical power, its object side surface may be convex, and its image side surface may be concave; the second lens may have negative optical power, its object side surface may be convex, and its image side surface may be concave; the third lens has optical power; the fourth lens has optical power; the fifth lens may have positive optical power; the sixth lens may have negative optical power, and its object side surface may be concave. Among them, the on-axis distance SAG52 from the intersection of the image side surface of the fifth lens and the optical axis to the effective half-aperture vertex of the image side surface of the fifth lens and the center thickness CT5 of the fifth lens on the optical axis may satisfy 1<|SAG52 / CT5|<1.5.

[0017] On the other hand, the present application provides such a camera optical system, which includes, in order 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 and a sixth lens. Among them, the first lens may have positive optical power, its object side surface may be convex, and its image side surface may be concave; the second lens may have negative optical power, its object side surface may be convex, and its image side surface may be concave; the third lens has optical power; the fourth lens has optical power; the fifth lens may have positive optical power; the sixth lens may have negative optical power, and its object side surface may be concave. Among them, the edge thickness ET6 of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis may satisfy 1<ET6 / CT6<2.

[0018] 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 camera optical system has at least one beneficial effect of ultra-thin, large aperture, large image surface, high imaging quality, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] Figure 1 A schematic structural diagram of an imaging optical system according to Embodiment 1 of the present application is shown;

[0021] FIG. 2A to FIG. 2D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging optical system of Example 1 are respectively shown;

[0022] Figure 3 A schematic structural diagram of an imaging optical system according to Embodiment 2 of the present application is shown;

[0023] 4A to 4D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging optical system of Example 2 are respectively shown;

[0024] Figure 5 A schematic structural diagram of an imaging optical system according to Embodiment 3 of the present application is shown;

[0025] FIG. 6A to FIG. 6D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging optical system of Example 3 are respectively shown;

[0026] Figure 7 A schematic structural diagram of an imaging optical system according to Embodiment 4 of the present application is shown;

[0027] FIG. 8A to FIG. 8DThe axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging optical system of Example 4 are respectively shown;

[0028] Fig. 9 A schematic structural diagram of an imaging optical system according to Embodiment 5 of the present application is shown;

[0029] FIG. 10A to FIG. 10D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging optical system of Example 5 are respectively shown;

[0030] Fig.11 A schematic structural diagram of an imaging optical system according to Embodiment 6 of the present application is shown;

[0031] FIG. 12A to FIG. 12D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the imaging optical system of Example 6 are respectively shown;

[0032] Fig.13 A schematic structural diagram of an imaging optical system according to Embodiment 7 of the present application is shown;

[0033] FIG. 14A to FIG. 14D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the imaging optical system of Example 7 are respectively shown;

[0034] Fig.15 A schematic structural diagram of an imaging optical system according to Embodiment 8 of the present application is shown;

[0035] FIG. 16A to FIG. 16D The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the imaging optical system of Example 8 are respectively shown. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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 subject 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] The features, principles and other aspects of the present application are described in detail below.

[0044] The imaging optical system according to the exemplary embodiment of the present application may include, for example, six lenses having 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, and each adjacent lens may have an air gap between them.

[0045] In an exemplary embodiment, the first lens may have positive optical power, and its object side surface may be convex and its image side surface may be concave; the second lens may have negative optical power, and its object side surface may be convex and its image side surface may be concave; the third lens may have positive optical power or negative optical power; the fourth lens may have positive optical power or negative optical power; the fifth lens may have positive optical power; and the sixth lens may have negative optical power, and its object side surface may be concave.

[0046] Reasonable control of the optical power and surface shape of the first lens and the second lens is conducive to reducing the aberration of the system's on-axis field of view, so that the system has good imaging performance on the axis. The reasonable combination of the third lens, the fourth lens, and the fifth lens is conducive to balancing the high-order aberrations generated by the lenses, so that each field of view of the system has a smaller aberration. By controlling the surface shape of the object side of the sixth lens to be concave, it is conducive to matching the system's principal light and the image plane.

[0047] In example embodiments, the object-side surface of the third lens may be a convex surface.

[0048] In example embodiments, the object-side surface of the fifth lens may be a convex surface, and the image-side surface may be a convex surface.

[0049] In example embodiments, the image-side surface of the sixth lens may be a concave surface.

[0050] In an exemplary embodiment, the imaging optical system of the present application may satisfy the conditional formula 4.6mm<f*tan(HFOV)<7mm, where f is the total effective focal length of the imaging optical system, and HFOV is the maximum half field angle of the imaging optical system. More specifically, f and HFOV may further satisfy 4.6mm<f*tan(HFOV)≤5.0mm, for example, 4.64mm≤f*tan(HFOV)≤4.71mm. By constraining the total effective focal length and the maximum half field angle of the imaging optical system, the imaging effect of a large image surface of the system can be achieved.

[0051] In an exemplary embodiment, the imaging optical system of the present application may satisfy the conditional formula TTL / ImgH<1.5, wherein TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the imaging optical system, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the imaging optical system. More specifically, TTL and ImgH may further satisfy 1.40≤TTL / ImgH≤1.42. By constraining the ratio of the on-axis distance from the object side of the first lens to the imaging surface and the image height, the ultra-thin characteristics of the system can be achieved.

[0052] In an exemplary embodiment, the imaging optical system of the present application may satisfy the conditional formula -2.5<f1 / f6<-1.5, where f1 is the effective focal length of the first lens and f6 is the effective focal length of the sixth lens. More specifically, f1 and f6 may further satisfy -2.12≤f1 / f6≤-1.71. By reasonably controlling the ratio of the effective focal lengths of the first lens and the sixth lens, the optical power of the system can be reasonably allocated so that the positive and negative spherical aberrations of the front lens group and the rear lens group cancel each other out.

[0053] In an exemplary embodiment, the imaging optical system of the present application may satisfy the conditional formula -2.5<f2 / (f5*2)<-1.5, where f2 is the effective focal length of the second lens and f5 is the effective focal length of the fifth lens. More specifically, f2 and f5 may further satisfy -2.19≤f2 / (f5*2)≤-1.55. Reasonable allocation of the optical power of the second lens and the fifth lens so that the ratio of the effective focal length of the second lens to the fifth lens is within a certain range is conducive to balancing the off-axis aberration of the imaging optical system.

[0054] In an exemplary embodiment, the imaging optical system of the present application may satisfy the conditional formula 1<|SAG52 / CT5|<1.5, wherein SAG52 is the on-axis distance from the intersection of the image side surface of the fifth lens and the optical axis to the effective half-aperture vertex of the image side surface of the fifth lens, and CT5 is the center thickness of the fifth lens on the optical axis. More specifically, SAG52 and CT5 may further satisfy 1.17≤|SAG52 / CT5|≤1.36. Satisfying the conditional formula 1<|SAG52 / CT5|<1.5 can effectively reduce the incident angle of the main light on the image side surface of the fifth lens, thereby effectively improving the matching degree between the optical system and the chip.

[0055] In an exemplary embodiment, the imaging optical system of the present application may satisfy the conditional formula 1<ET6 / CT6<2, wherein ET6 is the edge thickness of the sixth lens, and CT6 is the center thickness of the sixth lens on the optical axis. More specifically, ET6 and CT6 may further satisfy 1.12≤ET6 / CT6≤1.60. By reasonably controlling the ratio of the edge thickness to the center thickness of the sixth lens, the imaging optical system has good processability and is easy to manufacture.

[0056] In an exemplary embodiment, the imaging optical system of the present application may satisfy the conditional formula 1<R4 / R1<2, wherein R1 is the radius of curvature of the object side surface of the first lens, and R4 is the radius of curvature of the image side surface of the second lens. More specifically, R4 and R1 may further satisfy 1.46≤R4 / R1≤1.81. Reasonable control of the ratio of the radius of curvature of the image side surface of the fourth lens to the radius of curvature of the object side surface of the first lens can effectively balance the on-axis aberrations generated by the imaging optical system.

[0057] In an exemplary embodiment, the imaging optical system of the present application may satisfy the conditional formula -2.5<R3 / R11<-1, where R3 is the radius of curvature of the object side surface of the second lens, and R11 is the radius of curvature of the object side surface of the sixth lens. More specifically, R3 and R11 may further satisfy -2.32≤R3 / R11≤-1.44. By controlling the ratio of the radius of curvature of the object side surface of the second lens and the object side surface of the sixth lens, the light angle of the edge field of view can be controlled within a reasonable range, thereby effectively reducing the sensitivity of the system.

[0058] In an exemplary embodiment, the imaging optical system of the present application may satisfy the conditional formula 0.6<T56 / T23<1.2, wherein T56 is the distance between the fifth lens and the sixth lens on the optical axis, and T23 is the distance between the second lens and the third lens on the optical axis. More specifically, T56 and T23 may further satisfy 0.77≤T56 / T23≤1.14. By constraining the air gap between the fifth lens and the sixth lens and the air gap between the second lens and the third lens, the field curvature generated by the front lens group and the field curvature generated by the rear lens group of the system can be balanced, so that the system has a reasonable field curvature.

[0059] In an exemplary embodiment, the imaging optical system of the present application may satisfy the conditional formula 1<CT1 / (CT2+CT3)<1.5, 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, and CT3 is the center thickness of the third lens on the optical axis. More specifically, CT1, CT2, and CT3 may further satisfy 1.18≤CT1 / (CT2+CT3)≤1.36. By reasonably controlling the ratio of the center thickness of the first lens to the sum of the center thicknesses of the second lens and the third lens, it is possible to ensure that the optical system has good machinability characteristics, and it is possible to ensure that the on-axis distance from the object side of the first lens to the imaging surface of the optical system is controlled within a certain range.

[0060] In an exemplary embodiment, the imaging optical system of the present application may satisfy the conditional formula f / EPD<1.8, wherein f is the total effective focal length of the imaging optical system, and EPD is the entrance pupil diameter of the imaging optical system. More specifically, f and EPD may further satisfy 1.65≤f / EPD≤1.75, for example, 1.69≤f / EPD≤1.70. When the conditional formula f / EPD<1.8 is satisfied, the imaging optical system has the characteristics of a larger aperture, thereby increasing the luminous flux of the system per unit time and enhancing the imaging effect in a dark environment; at the same time, the aberration of the edge field of view may be reduced.

[0061] In an exemplary embodiment, the above-mentioned imaging optical system may further include an aperture to improve the imaging quality of the optical system. It should be understood by those skilled in the art that the aperture may be set at any position as required. For example, the aperture may be set between the object side and the first lens; or, the aperture may be set between the first lens and the second lens.

[0062] Optionally, the above-mentioned camera optical 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.

[0063] The camera optical system according to the above 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 optical system can be effectively reduced, the sensitivity of the optical system can be reduced, and the processability of the optical system can be improved, so that the camera optical system is more conducive to production and processing and can be applied to portable electronic products. The camera optical system configured as above can also have the beneficial effects of large image surface, large aperture, miniaturization, high imaging quality, etc.

[0064] 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 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. 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, 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.

[0065] However, it should be understood by those skilled in the art that, without departing from the technical solution claimed in the present application, the number of lenses constituting the imaging optical 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 imaging optical system is not limited to including six lenses. If necessary, the imaging optical system may also include other numbers of lenses.

[0066] Specific examples of the imaging optical system applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0067] Example 1

[0068] The following reference Figures 1 to 2DAn imaging optical system according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of an imaging optical system according to Embodiment 1 of the present application is shown.

[0069] like Figure 1 As shown, the imaging optical system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: an aperture STO, 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 filter E7 and an imaging surface S15.

[0070] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative 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 negative 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 convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0071] Table 1 shows the surface type, curvature radius, thickness, material and conic coefficient of each lens of the imaging optical system of Example 1, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0072]

[0073] Table 1

[0074] As can be seen from Table 1, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces. In this embodiment, the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0075]

[0076] 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 (given in Table 1); 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, A40, A41, A42, A43, A44, A45, A46, A47, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75, A76, A77, A8, A9, A10, A11, A12, A13, A14, A15 10 , A 12 , A 14 , A 16, A 18 and A 20 .

[0077] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.4304E-03 8.6937E-03 -1.7385E-02 2.2318E-02 -1.8171E-02 9.3766E-03 -2.9888E-03 5.3601E-04 -4.2198E-05 S2 -1.9305E-02 1.8495E-02 -1.2501E-02 1.3562E-02 -1.7028E-02 1.3575E-02 -6.2576E-03 1.5410E-03 -1.5763E-04 S3 -6.4995E-02 6.1193E-02 -2.4692E-02 1.8002E-02 -3.1170E-02 3.2239E-02 -1.7531E-02 4.9060E-03 -5.5950E-04 S4 -4.6805E-02 6.0452E-02 -5.5829E-02 1.1431E-01 -1.8116E-01 1.7141E-01 -9.3332E-02 2.7227E-02 -3.2650E-03 S5 -3.5567E-02 1.9088E-02 -4.6905E-02 6.4179E-02 -6.2094E-02 3.8300E-02 -1.4397E-02 2.8259E-03 -1.9255E-04 S6 -6.0548E-02 2.2490E-02 -5.5819E-02 8.1464E-02 -8.7056E-02 6.0591E-02 -2.5833E-02 6.1451E-03 -6.2619E-04 S7 -7.3371E-02 2.1583E-02 -3.8994E-02 5.5579E-02 -5.7388E-02 3.8509E-02 -1.5642E-02 3.5511E-03 -3.4823E-04 S8 -5.8456E-02 2.9089E-02 -3.7065E-02 3.6498E-02 -2.3374E-02 9.6348E-03 -2.4647E-03 3.5555E-04 -2.1927E-05 S9 -2.5423E-02 7.7336E-05 6.6994E-04 -2.1733E-03 1.0800E-03 -9.5867E-05 -6.6958E-05 1.9214E-05 -1.4822E-06 S10 -3.6454E-02 1.3530E-02 -3.4348E-03 -1.0883E-03 9.2497E-04 -2.0948E-04 1.9551E-05 -5.4985E-07 -1.1891E-08 S11 -5.1822E-02 2.4423E-02 -1.2209E-02 4.2176E-03 -8.4210E-04 9.9621E-05 -6.9863E-06 2.7029E-07 -4.4678E-09 S12 -3.2057E-02 1.1499E-02 -3.5690E-03 7.8497E-04 -1.1952E-04 1.2161E-05 -7.8491E-07 2.8887E-08 -4.5800E-10

[0078] Table 2

[0079] Table 3 gives the effective focal lengths f1 to f6 of each lens in Example 1, the total effective focal length f of the imaging optical system, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis, and half the diagonal length ImgH of the effective pixel area on the imaging surface S15.

[0080] f1(mm) 5.06 f6(mm) -2.42 f2(mm) -13.79 f(mm) 5.50 f3(mm) 28.04 TTL(mm) 6.70 f4(mm) -39.96 ImgH(mm) 4.75 f5(mm) 3.16

[0081] Table 3

[0082] The imaging optical system in Embodiment 1 satisfies:

[0083] f*tan(HFOV)=4.64, where f is the total effective focal length of the imaging optical system, and HFOV is the maximum half field angle of the imaging optical system;

[0084] TTL / ImgH=1.41, where TTL is the distance from the object-side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis, and ImgH is half the diagonal length of the effective pixel area on the imaging surface S15;

[0085] f1 / f6=-2.09, where f1 is the effective focal length of the first lens E1, and f6 is the effective focal length of the sixth lens E6;

[0086] f2 / (f5*2)=-2.18, where f2 is the effective focal length of the second lens element E2, and f5 is the effective focal length of the fifth lens element E5;

[0087] |SAG52 / CT5|=1.35, wherein SAG52 is the axial distance from the intersection of the image-side surface S10 of the fifth lens E5 and the optical axis to the effective half-aperture vertex of the image-side surface S10 of the fifth lens E5, and CT5 is the central thickness of the fifth lens E5 on the optical axis;

[0088] ET6 / CT6=1.60, wherein ET6 is the edge thickness of the sixth lens E6, and CT6 is the center thickness of the sixth lens E6 on the optical axis;

[0089] R4 / R1=1.81, where R1 is the curvature radius of the object-side surface S1 of the first lens E1, and R4 is the curvature radius of the image-side surface S4 of the second lens E2;

[0090] R3 / R11=-2.27, where R3 is the curvature radius of the object-side surface S3 of the second lens E2, and R11 is the curvature radius of the object-side surface S11 of the sixth lens E6;

[0091] T56 / T23=0.99, wherein T56 is the distance between the fifth lens E5 and the sixth lens E6 on the optical axis, and T23 is the distance between the second lens E2 and the third lens E3 on the optical axis;

[0092] CT1 / (CT2+CT3)=1.21, wherein CT1 is the center thickness of the first lens E1 on the optical axis, CT2 is the center thickness of the second lens E2 on the optical axis, and CT3 is the center thickness of the third lens E3 on the optical axis;

[0093] f / EPD=1.69, where f is the total effective focal length of the imaging optical system, and EPD is the entrance pupil diameter of the imaging optical system.

[0094] Figure 2A The axial chromatic aberration curve of the imaging optical system of Example 1 is shown, which indicates the deviation of the convergence point of light rays of different wavelengths after passing through the system. Figure 2B The astigmatism curve of the imaging optical system of Example 1 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 2C The distortion curve of the imaging optical system of Example 1 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Figure 2D The magnification chromatic aberration curve of the imaging optical system of Example 1 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the system. FIG. 2A to FIG. 2D It can be seen that the imaging optical system provided in Example 1 can achieve good imaging quality.

[0095] Example 2

[0096] The following reference Figures 3 to 4D The imaging optical 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 imaging optical system according to Embodiment 2 of the present application is shown.

[0097] like Figure 3 As shown, the imaging optical system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0098] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative 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 concave. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0099] Table 4 shows the surface type, curvature radius, thickness, material and conic coefficient of each lens of the imaging optical system of Example 2, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0100]

[0101] Table 4

[0102] It can be seen from Table 4 that in Example 2, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces. Table 5 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0103] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -8.6839E-04 1.7656E-03 -1.2418E-03 -7.7395E-04 1.8774E-03 -1.5028E-03 6.0968E-04 -1.2917E-04 1.1026E-05 S2 -2.7923E-02 3.8825E-02 -2.9775E-02 1.0943E-02 9.4871E-04 -3.1714E-03 1.5118E-03 -3.2770E-04 2.8216E-05 S3 -5.5905E-02 6.6006E-02 -1.7672E-02 -4.7091E-02 8.1484E-02 -6.5346E-02 2.9927E-02 -7.4789E-03 7.9620E-04 S4 -3.2614E-02 3.0067E-02 6.2132E-02 -2.1587E-01 3.4338E-01 -3.2635E-01 1.8860E-01 -6.1117E-02 8.5692E-03 S5 -2.5235E-02 -2.0320E-02 9.3531E-02 -2.7693E-01 4.6108E-01 -4.6713E-01 2.8295E-01 -9.4468E-02 1.3401E-02 S6 -3.4772E-02 -2.7625E-02 7.8933E-02 -1.4204E-01 1.4785E-01 -9.8975E-02 4.1494E-02 -9.7910E-03 9.9344E-04 S7 -6.5684E-02 1.6684E-02 -1.8634E-02 2.4310E-02 -2.0087E-02 5.4894E-03 1.9420E-03 -1.3021E-03 1.8511E-04 S8 -6.5286E-02 1.9970E-02 -2.0365E-02 2.3511E-02 -1.6628E-02 7.0431E-03 -1.7037E-03 2.1562E-04 -1.1058E-05 S9 -2.9729E-02 7.6138E-03 -2.3739E-02 2.3017E-02 -1.2598E-02 4.3051E-03 -9.1596E-04 1.1040E-04 -5.6708E-06 S10 -2.0793E-02 1.0705E-02 -1.4037E-02 7.9693E-03 -2.2681E-03 3.7211E-04 -3.6470E-05 2.0125E-06 -4.8630E-08 S11 -2.7438E-02 -1.7458E-02 1.2274E-02 -3.0139E-03 4.0550E-04 -3.2828E-05 1.5963E-06 -4.2914E-08 4.8797E-10 S12 -3.6071E-02 8.3754E-03 -1.2470E-03 6.7244E-05 9.1734E-06 -2.1142E-06 1.7598E-07 -6.8108E-09 9.9945E-11

[0104] Table 5

[0105] Table 6 gives the effective focal lengths f1 to f6 of each lens in Example 2, the total effective focal length f of the imaging optical system, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15, and half the diagonal length ImgH of the effective pixel area on the imaging surface S15.

[0106] f1(mm) 4.60 f6(mm) -2.40 f2(mm) -10.86 f(mm) 5.63 f3(mm) 50.14 TTL(mm) 6.72 f4(mm) -31.52 ImgH(mm) 4.79 f5(mm) 2.93

[0107] Table 6

[0108] Figure 4A The axial chromatic aberration curve of the imaging optical system of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the system. Figure 4B The astigmatism curve of the imaging optical system of Example 2 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 4C The distortion curve of the imaging optical system of Example 2 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Figure 4DThe magnification chromatic aberration curve of the imaging optical system of Example 2 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the system. 4A to 4D It can be seen that the imaging optical system provided in Example 2 can achieve good imaging quality.

[0109] Example 3

[0110] The following reference Figures 5 to 6D The imaging optical system according to Embodiment 3 of the present application is described. Figure 5 A schematic structural diagram of an imaging optical system according to Embodiment 3 of the present application is shown.

[0111] like Figure 5 As shown, the imaging optical system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0112] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative 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 concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0113] Table 7 shows the surface type, curvature radius, thickness, material and conic coefficient of each lens of the imaging optical system of Example 3, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0114]

[0115]

[0116] Table 7

[0117] It can be seen from Table 7 that in Example 3, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces. Table 8 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0118] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.8455E-04 -1.8415E-03 7.0305E-03 -1.1812E-02 1.1270E-02 -6.4869E-03 2.2060E-03 -4.0991E-04 3.1586E-05 S2 -3.8962E-02 3.1139E-02 -1.2208E-02 -3.9811E-03 8.7146E-03 -5.8702E-03 2.1461E-03 -4.2362E-04 3.5426E-05 S3 -6.3514E-02 5.1538E-02 -3.5825E-03 -3.6181E-02 4.7611E-02 -3.3413E-02 1.4103E-02 -3.3307E-03 3.3940E-04 S4 -3.1107E-02 3.0066E-02 1.8587E-02 -6.6870E-02 9.3919E-02 -8.1854E-02 4.5446E-02 -1.4526E-02 2.0412E-03 S5 -3.6172E-02 2.1062E-03 1.3706E-02 -8.9816E-02 1.7057E-01 -1.7837E-01 1.0639E-01 -3.4057E-02 4.5319E-03 S6 -7.5125E-02 3.1859E-02 -2.9536E-02 1.1341E-02 -3.7043E-03 9.7024E-04 3.1955E-04 -2.8116E-04 4.7835E-05 S7 -1.1104E-01 6.7344E-02 -9.5790E-02 1.2969E-01 -1.2133E-01 7.0317E-02 -2.3722E-02 4.2774E-03 -3.2002E-04 S8 -8.2078E-02 3.1259E-02 -2.5790E-02 2.5249E-02 -1.7216E-02 7.3954E-03 -1.9019E-03 2.6867E-04 -1.6046E-05 S9 -1.5898E-02 -4.9669E-03 -3.4240E-03 3.2894E-03 -1.2374E-03 3.0617E-04 -6.8124E-05 1.1216E-05 -7.8322E-07 S10 4.3050E-02 -2.2919E-02 5.0019E-03 -5.9588E-04 1.8852E-04 -3.7969E-05 6.5508E-07 4.7688E-07 -3.3748E-08 S11 -1.5253E-02 -1.5956E-02 8.5110E-03 -1.5257E-03 1.1588E-04 -1.0394E-07 -6.0884E-07 4.0038E-08 -8.6204E-10 S12 -6.8582E-02 1.7882E-02 -4.0525E-03 7.2327E-04 -9.7784E-05 9.4565E-06 -6.0929E-07 2.3160E-08 -3.8677E-10

[0119] Table 8

[0120] Table 9 gives the effective focal lengths f1 to f6 of each lens in Example 3, the total effective focal length f of the imaging optical system, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15, and half the diagonal length ImgH of the effective pixel area on the imaging surface S15.

[0121] f1(mm) 5.03 f6(mm) -2.93 f2(mm) -11.95 f(mm) 5.60 f3(mm) 105.32 TTL(mm) 6.70 f4(mm) 603.85 ImgH(mm) 4.79 f5(mm) 3.77

[0122] Table 9

[0123] Fig. 6A The axial chromatic aberration curve of the imaging optical system of Example 3 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 imaging optical system of Example 3 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 6C The distortion curve of the imaging optical system of Example 3 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.6D The magnification chromatic aberration curve of the imaging optical system of Example 3 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the system. FIG. 6A to FIG. 6D It can be seen that the imaging optical system provided in Example 3 can achieve good imaging quality.

[0124] Example 4

[0125] The following reference Figures 7 to 8D The imaging optical system according to Embodiment 4 of the present application is described. Figure 7 A schematic structural diagram of an imaging optical system according to Embodiment 4 of the present application is shown.

[0126] like Figure 7 As shown, the imaging optical system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0127] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative 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 concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0128] Table 10 shows the surface type, curvature radius, thickness, material and conic coefficient of each lens of the imaging optical system of Example 4, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0129]

[0130]

[0131] Table 10

[0132] It can be seen from Table 10 that in Example 4, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces. Table 11 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0133] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.4443E-04 -1.5339E-03 6.0097E-03 -1.0339E-02 1.0061E-02 -5.9117E-03 2.0503E-03 -3.8877E-04 3.0577E-05 S2 -4.1139E-02 3.5463E-02 -1.7248E-02 7.0787E-04 5.0563E-03 -3.7600E-03 1.3539E-03 -2.5467E-04 2.0011E-05 S3 -6.4431E-02 5.2544E-02 2.2704E-03 -5.5647E-02 7.5442E-02 -5.5854E-02 2.4615E-02 -5.9956E-03 6.2185E-04 S4 -3.1375E-02 3.3785E-02 -1.1602E-03 -1.2424E-02 3.7829E-03 8.2745E-03 -7.8169E-03 2.5960E-03 -2.6705E-04 S5 -3.6610E-02 3.7793E-03 1.9630E-03 -5.7343E-02 1.1865E-01 -1.2752E-01 7.6355E-02 -2.4287E-02 3.1922E-03 S6 -7.3271E-02 2.1772E-02 -8.2686E-03 -1.7810E-02 2.1785E-02 -1.2334E-02 4.1062E-03 -7.5490E-04 5.6513E-05 S7 -1.0906E-01 5.1032E-02 -5.7838E-02 7.4743E-02 -7.0592E-02 4.1351E-02 -1.3901E-02 2.4699E-03 -1.8117E-04 S8 -8.0643E-02 2.1895E-02 -8.9453E-03 7.1372E-03 -4.8565E-03 2.1305E-03 -5.6028E-04 8.2694E-05 -5.3011E-06 S9 -1.2433E-02 -1.2376E-02 6.8066E-03 -5.2606E-03 3.2272E-03 -1.1462E-03 2.1748E-04 -1.9754E-05 6.3230E-07 S10 4.5599E-02 -2.7729E-02 1.0527E-02 -4.0329E-03 1.4551E-03 -3.2036E-04 3.7985E-05 -2.2159E-06 4.7954E-08 S11 -2.1945E-02 -1.0015E-02 6.6490E-03 -1.2541E-03 1.0849E-04 -3.1334E-06 -1.7553E-07 1.5749E-08 -3.4351E-10 S12 -7.8976E-02 2.4034E-02 -6.3809E-03 1.2973E-03 -1.9098E-04 1.9293E-05 -1.2569E-06 4.7234E-08 -7.7106E-10

[0134] Table 11

[0135] Table 12 gives the effective focal lengths f1 to f6 of each lens in Example 4, the total effective focal length f of the imaging optical system, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15, and half the diagonal length ImgH of the effective pixel area on the imaging surface S15.

[0136]

[0137]

[0138] Table 12

[0139] Fig. 8A The axial chromatic aberration curve of the imaging optical system of Example 4 is shown, which indicates the deviation of the focal point after light of different wavelengths passes through the system. Figure 8BThe astigmatism curve of the imaging optical system of Example 4 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 8C The distortion curve of the imaging optical system of Example 4 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.8D The magnification chromatic aberration curve of the imaging optical system of Example 4 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the system. FIG. 8A to FIG. 8D It can be seen that the imaging optical system provided in Example 4 can achieve good imaging quality.

[0140] Example 5

[0141] The following reference Figures 9 to 10D The imaging optical system according to Embodiment 5 of the present application is described. Fig. 9 A schematic structural diagram of an imaging optical system according to Example 5 of the present application is shown.

[0142] like Fig. 9 As shown, the imaging optical system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, an aperture STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0143] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative 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 negative 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 convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0144] Table 13 shows the surface type, curvature radius, thickness, material and conic coefficient of each lens of the imaging optical system of Example 5, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0145]

[0146] Table 13

[0147] It can be seen from Table 13 that in Example 5, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces. Table 14 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 5, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0148] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.1959E-04 5.4931E-05 4.4085E-03 -9.5158E-03 9.9157E-03 -5.9980E-03 2.1130E-03 -4.0541E-04 3.2225E-05 S2 -2.2630E-02 2.5114E-02 -1.1958E-02 -3.4232E-03 8.5557E-03 -5.7668E-03 2.0377E-03 -3.8097E-04 2.9789E-05 S3 -5.8006E-02 5.8008E-02 1.8358E-03 -7.4808E-02 1.1189E-01 -8.9432E-02 4.2096E-02 -1.0905E-02 1.2026E-03 S4 -3.7728E-02 3.8862E-02 3.2027E-02 -1.2350E-01 1.8363E-01 -1.6306E-01 8.9772E-02 -2.8247E-02 3.9266E-03 S5 -3.1258E-02 1.2627E-02 -2.4556E-02 -8.8826E-03 7.6514E-02 -1.1966E-01 9.0765E-02 -3.4961E-02 5.4721E-03 S6 -4.5273E-02 -6.4765E-03 2.8081E-02 -6.4181E-02 6.7663E-02 -4.3372E-02 1.6907E-02 -3.5955E-03 3.1908E-04 S7 -7.0845E-02 2.5291E-02 -3.3997E-02 3.6562E-02 -2.9227E-02 1.3354E-02 -2.5633E-03 3.8080E-05 2.5063E-05 S8 -6.0880E-02 2.1368E-02 -1.9646E-02 1.7170E-02 -1.0384E-02 4.0797E-03 -9.5801E-04 1.2211E-04 -6.5479E-06 S9 -2.6285E-02 2.4847E-03 -7.1034E-03 4.8314E-03 -2.1365E-03 6.9039E-04 -1.5483E-04 2.0564E-05 -1.1595E-06 S10 -2.6211E-02 9.1155E-03 -7.3340E-03 3.3067E-03 -8.4854E-04 1.6018E-04 -2.2696E-05 1.9597E-06 -7.2365E-08 S11 -3.9298E-02 1.3553E-03 2.5358E-03 -4.3166E-04 2.0822E-07 6.7069E-06 -7.7459E-07 3.7575E-08 -7.0137E-10 S12 -3.7841E-02 1.2407E-02 -3.1923E-03 5.8561E-04 -7.7781E-05 7.2481E-06 -4.4712E-07 1.6307E-08 -2.6304E-10

[0149] Table 14

[0150] Table 15 gives the effective focal lengths f1 to f6 of each lens in Example 5, the total effective focal length f of the imaging optical system, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15, and half the diagonal length ImgH of the effective pixel area on the imaging surface S15.

[0151] f1(mm) 4.74 f6(mm) -2.28 f2(mm) -11.17 f(mm) 5.53 f3(mm) 32.55 TTL(mm) 6.70 f4(mm) -30.28 ImgH(mm) 4.75 f5(mm) 2.81

[0152] Table 15

[0153] Fig. 10A The axial chromatic aberration curve of the imaging optical system of Example 5 is shown, which indicates the deviation of the focal point after light of different wavelengths passes through the system. Fig. 10B The astigmatism curve of the imaging optical system of Example 5 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig. 10C The distortion curve of the imaging optical system of Example 5 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig. 10D The magnification chromatic aberration curve of the imaging optical system of Example 5 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the system. FIG. 10A to FIG. 10D It can be seen that the imaging optical system provided in Example 5 can achieve good imaging quality.

[0154] Example 6

[0155] The following reference Figures 11 to 12D The imaging optical system according to Embodiment 6 of the present application is described. Fig.11 A schematic structural diagram of an imaging optical system according to Example 6 of the present application is shown.

[0156] like Fig.11 As shown, the imaging optical system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: an aperture STO, 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 filter E7 and an imaging surface S15.

[0157] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative 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 negative 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 convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0158] Table 16 shows the surface type, curvature radius, thickness, material and conic coefficient of each lens of the imaging optical system of Example 6, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0159]

[0160] Table 16

[0161] It can be seen from Table 16 that in Example 6, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces. Table 17 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0162]

[0163]

[0164] Table 17

[0165] Table 18 gives the effective focal lengths f1 to f6 of each lens in Example 6, the total effective focal length f of the imaging optical system, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S15, and half the diagonal length ImgH of the effective pixel area on the imaging surface S15.

[0166] f1(mm) 5.03 f6(mm) -2.37 f2(mm) -13.39 f(mm) 5.54 f3(mm) 28.23 TTL(mm) 6.73 f4(mm) -36.84 ImgH(mm) 4.75 f5(mm) 3.05

[0167] Table 18

[0168] Fig. 12A The axial chromatic aberration curve of the imaging optical system of Example 6 is shown, which indicates the deviation of the focal point after light of different wavelengths passes through the system. Fig. 12B The astigmatism curve of the imaging optical system of Example 6 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig. 12CThe distortion curve of the imaging optical system of Example 6 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.12D The magnification chromatic aberration curve of the imaging optical system of Example 6 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the system. FIG. 12A to FIG. 12D It can be seen that the imaging optical system provided in Example 6 can achieve good imaging quality.

[0169] Example 7

[0170] The following reference Figures 13 to 14D The imaging optical system according to Embodiment 7 of the present application is described. Fig.13 A schematic structural diagram of an imaging optical system according to Example 7 of the present application is shown.

[0171] like Fig.13 As shown, the imaging optical system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: an aperture STO, 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 filter E7 and an imaging surface S15.

[0172] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative 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 negative 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 convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0173] Table 19 shows the surface type, curvature radius, thickness, material and conic coefficient of each lens of the imaging optical system of Example 7, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0174]

[0175] Table 19

[0176] It can be seen from Table 19 that in Example 7, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces. Table 20 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 7, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0177]

[0178]

[0179] Table 20

[0180] Table 21 gives the effective focal lengths f1 to f6 of each lens in Example 7, the total effective focal length f of the imaging optical system, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15, and half the diagonal length ImgH of the effective pixel area on the imaging surface S15.

[0181] f1(mm) 5.06 f6(mm) -2.42 f2(mm) -13.79 f(mm) 5.50 f3(mm) 28.04 TTL(mm) 6.70 f4(mm) -39.96 ImgH(mm) 4.75 f5(mm) 3.16

[0182] Table 21

[0183] Fig.14A The axial chromatic aberration curve of the imaging optical system of Example 7 is shown, which indicates the deviation of the focal point after light of different wavelengths passes through the system. Fig. 14B The astigmatism curve of the imaging optical system of Example 7 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig. 14C The distortion curve of the imaging optical system of Example 7 is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.14D The magnification chromatic aberration curve of the imaging optical system of Example 7 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the system. FIG. 14A to FIG. 14D It can be seen that the imaging optical system provided in Example 7 can achieve good imaging quality.

[0184] Example 8

[0185] The following reference Figures 15 to 16D The imaging optical system according to Embodiment 8 of the present application is described. Fig.15 A schematic structural diagram of an imaging optical system according to Example 8 of the present application is shown.

[0186] like Fig.15 As shown, the imaging optical system according to the exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: an aperture STO, 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 filter E7 and an imaging surface S15.

[0187] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface S15.

[0188] Table 22 shows the surface type, curvature radius, thickness, material and cone coefficient of each lens of the imaging optical system of Example 8, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0189]

[0190] Table 22

[0191] It can be seen from Table 22 that in Example 8, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces. Table 23 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 8, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0192] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 4.7743E-04 2.3864E-03 -3.4031E-03 3.3098E-03 -1.9609E-03 6.9680E-04 -1.6323E-04 2.6585E-05 -3.3161E-06 S2 -1.9753E-02 2.1802E-02 -1.7495E-02 1.4738E-02 -1.2321E-02 7.4936E-03 -2.8634E-03 6.0723E-04 -5.4691E-05 S3 -5.3755E-02 5.0974E-02 -2.1512E-02 8.0293E-03 -7.8392E-03 8.0507E-03 -4.3557E-03 1.1797E-03 -1.2701E-04 S4 -3.5519E-02 4.7268E-02 -3.7671E-02 6.0648E-02 -8.3671E-02 7.3585E-02 -3.7685E-02 1.0355E-02 -1.1526E-03 S5 -2.5235E-02 4.0995E-03 -1.1843E-03 -1.1831E-02 2.1359E-02 -1.8391E-02 8.8409E-03 -2.2723E-03 2.4695E-04 S6 -8.7117E-02 6.1185E-02 -8.3678E-02 9.0415E-02 -7.3315E-02 4.2295E-02 -1.6419E-02 3.7947E-03 -3.9101E-04 S7 -1.0300E-01 6.7252E-02 -1.1947E-01 1.7267E-01 -1.7206E-01 1.1155E-01 -4.5002E-02 1.0195E-02 -9.8828E-04 S8 -5.9950E-02 2.8359E-02 -3.7625E-02 3.9499E-02 -2.6620E-02 1.1260E-02 -2.9207E-03 4.2484E-04 -2.6291E-05 S9 -2.1949E-02 1.9926E-03 -5.6128E-03 4.6594E-03 -2.5959E-03 9.8518E-04 -2.3712E-04 3.1322E-05 -1.6839E-06 S10 -1.6699E-02 -5.5300E-04 1.1342E-03 -1.0255E-03 4.6622E-04 -9.8038E-05 1.0423E-05 -5.4592E-07 1.1071E-08 S11 -4.1572E-02 1.2360E-02 -4.4245E-03 1.4142E-03 -2.6222E-04 2.8151E-05 -1.7626E-06 6.0225E-08 -8.7260E-10 S12 -2.6863E-02 8.2350E-03 -2.1921E-03 4.3476E-04 -6.2544E-05 6.1421E-06 -3.8615E-07 1.3888E-08 -2.1506E-10

[0193] Table 23

[0194] Table 24 gives the effective focal lengths f1 to f6 of each lens in Example 8, the total effective focal length f of the imaging optical system, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15, and half the diagonal length ImgH of the effective pixel area on the imaging surface S15.

[0195] f1(mm) 4.84 f6(mm) -2.68 f2(mm) -13.58 f(mm) 5.54 f3(mm) -79.05 TTL(mm) 6.70 f4(mm) 40.84 ImgH(mm) 4.75 f5(mm) 3.88

[0196] Table 24

[0197] Fig.16A The axial chromatic aberration curve of the imaging optical system of Example 8 is shown, which indicates the deviation of the focal point after light of different wavelengths passes through the system. Fig. 16B The astigmatism curve of the imaging optical system of Example 8 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig. 16C The distortion curve of the imaging optical system of Example 8 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.16DThe magnification chromatic aberration curve of the imaging optical system of Example 8 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the system. FIG. 16A to FIG. 16D It can be seen that the imaging optical system provided in Example 8 can achieve good imaging quality.

[0198] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 25.

[0199] Conditional formula\Example 1 2 3 4 5 6 7 8 f*TAN(HFOV)(mm) 4.64 4.71 4.67 4.66 4.64 4.64 4.64 4.64 TTL / ImgH 1.41 1.40 1.40 1.41 1.41 1.42 1.41 1.41 f1 / f6 -2.09 -1.92 -1.72 -1.71 -2.08 -2.12 -2.09 -1.81 f2 / (f5*2) -2.18 -1.85 -1.58 -1.55 -1.99 -2.19 -2.18 -1.75 |SAG52 / CT5| 1.35 1.17 1.28 1.27 1.35 1.36 1.35 1.17 ET6 / CT6 1.60 1.12 1.39 1.37 1.24 1.57 1.60 1.46 R4 / R1 1.81 1.46 1.47 1.62 1.52 1.71 1.81 1.77 R3 / R11 -2.27 -2.26 -1.44 -1.94 -2.16 -2.10 -2.27 -2.32 T56 / T23 0.99 0.77 1.14 1.11 0.80 0.92 0.99 1.03 CT1 / (CT2+CT3) 1.21 1.30 1.22 1.18 1.36 1.21 1.21 1.18 f / EPD 1.69 1.70 1.69 1.69 1.70 1.70 1.69 1.69

[0200] Table 25

[0201] The present application also provides a camera device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The camera device can be an independent camera device such as a digital camera, or a camera module integrated in a mobile electronic device such as a mobile phone. The camera device is equipped with the above-described camera optical system.

[0202] 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 the invention 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 inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. The imaging optical system includes, in order 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 and a sixth lens, It is characterized in that The first lens has positive refractive power, its object side surface is convex, and its image side surface is concave; The second lens has negative optical power, and its object side surface is convex and its image side surface is concave; The third lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The fourth lens has negative optical power, its object side surface is concave, and its image side surface is convex; The fifth lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The sixth lens has negative optical power, and its object side surface is concave, and its image side surface is concave; The number of lenses having optical power in the imaging optical system is six; The distance TTL from the object side of the first lens to the imaging plane of the imaging optical system on the optical axis and the half of the diagonal length of the effective pixel area on the imaging plane of the imaging optical system ImgH satisfy 1.41≤TTL / ImgH≤1.42; The curvature radius R1 of the object side surface of the first lens and the curvature radius R4 of the image side surface of the second lens satisfy 1.52≤R4 / R1≤1.81; The total effective focal length f of the camera optical system and the maximum half field of view HFOV of the camera optical system satisfy 4.6 mm < f*tan(HFOV) ≤ 4.64 mm; The effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy -2.19≤f2 / (f5*2)≤-1.99; An axial distance SAG52 from an intersection of the image side surface of the fifth lens and the optical axis to an effective half-aperture vertex of the image side surface of the fifth lens and a center thickness CT5 of the fifth lens on the optical axis satisfy 1.35≤|SAG52 / CT5|≤1.

36.

2. The imaging optical system according to claim 1, wherein: The effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens satisfy -2.12≤f1 / f6≤-2.

08.

3. The imaging optical system according to claim 1, wherein: A curvature radius R3 of the object-side surface of the second lens and a curvature radius R11 of the object-side surface of the sixth lens satisfy -2.27≤R3 / R11≤-2.

10.

4. The imaging optical system according to claim 2, wherein: A center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy 1.21≤CT1 / (CT2+CT3)≤1.

36.

5. The imaging optical system according to claim 2, wherein: A distance T56 between the fifth lens and the sixth lens on the optical axis and a distance T23 between the second lens and the third lens on the optical axis satisfy 0.80≤T56 / T23≤0.

99.

6. The imaging optical system according to claim 2, wherein: An edge thickness ET6 of the sixth lens and a center thickness CT6 of the sixth lens on the optical axis satisfy 1.24≤ET6 / CT6≤1.

60.

7. The imaging optical system according to any one of claims 1 to 6, characterized in that: The total effective focal length f of the imaging optical system and the entrance pupil diameter EPD of the imaging optical system satisfy 1.69≤f / EPD≤1.

70.

8. An imaging optical system, comprising, in order 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 and a sixth lens, It is characterized in that The first lens has positive refractive power, its object side surface is convex, and its image side surface is concave; The second lens has negative optical power, and its object side surface is convex and its image side surface is concave; The third lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The fourth lens has negative optical power, its object side surface is concave, and its image side surface is convex; The fifth lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The sixth lens has negative optical power, and its object side surface is concave, and its image side surface is concave; The number of lenses having optical power in the imaging optical system is six; An axial distance SAG52 from an intersection of the image side surface of the fifth lens and the optical axis to an effective half-aperture vertex of the image side surface of the fifth lens and a center thickness CT5 of the fifth lens on the optical axis satisfy 1.35≤|SAG52 / CT5|≤1.36; The curvature radius R1 of the object side surface of the first lens and the curvature radius R4 of the image side surface of the second lens satisfy 1.52≤R4 / R1≤1.81; The total effective focal length f of the camera optical system and the maximum half field of view HFOV of the camera optical system satisfy 4.6 mm < f*tan(HFOV) ≤ 4.64 mm; The effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy -2.19≤f2 / (f5*2)≤-1.

99.

9. The imaging optical system according to claim 8, wherein: The effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens satisfy -2.12≤f1 / f6≤-2.

08.

10. The imaging optical system according to claim 8, wherein: A curvature radius R3 of the object-side surface of the second lens and a curvature radius R11 of the object-side surface of the sixth lens satisfy -2.27≤R3 / R11≤-2.

10.

11. The imaging optical system according to claim 8, wherein: A center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy 1.21≤CT1 / (CT2+CT3)≤1.

36.

12. The imaging optical system according to claim 8, wherein: A distance T56 between the fifth lens and the sixth lens on the optical axis and a distance T23 between the second lens and the third lens on the optical axis satisfy 0.80≤T56 / T23≤0.

99.

13. The imaging optical system according to claim 8, wherein: An edge thickness ET6 of the sixth lens and a center thickness CT6 of the sixth lens on the optical axis satisfy 1.24≤ET6 / CT6≤1.

60.

14. The imaging optical system according to any one of claims 11 to 13, characterized in that: A distance TTL from the object side surface of the first lens to the imaging surface of the imaging optical system on the optical axis and half of the diagonal length of the effective pixel area on the imaging surface of the imaging optical system ImgH satisfy 1.41≤TTL / ImgH≤1.

42.

15. The imaging optical system according to any one of claims 8 to 13, characterized in that: The total effective focal length f of the imaging optical system and the entrance pupil diameter EPD of the imaging optical system satisfy 1.69≤f / EPD≤1.70.

Images