Camera lens

Abstract

The present application discloses a camera lens, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens; and a third lens; wherein the equivalent length TL of the actual propagation distance of the principal light from the object side of the first lens to the imaging surface in the air and the entrance pupil diameter EPD of the camera lens satisfy: 3.5<TL / EPD<4.0.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more specifically, to a camera lens. Background Art

[0002] Consumers have become accustomed to using mobile devices such as mobile phones to take photos and videos, and have placed higher and higher demands on the camera performance of these devices. In addition, the performance of the camera lenses installed on mobile phones and other devices has to be continuously improved to adapt to the development of image and video software functions on these devices.

[0003] Mobile phones and other portable devices are usually equipped with camera modules to enable the mobile phones to have camera functions. The camera module is usually equipped with a charge-coupled device (CCD) type image sensor or a complementary metal oxide semiconductor (CMOS) type image sensor, and a camera lens. The camera lens can collect the light on the object side, and the imaging light travels along the optical path of the camera lens and irradiates the image sensor, and then the image sensor converts the light signal into an electrical signal to form image data.

[0004] With the advancement of semiconductor manufacturing technology, the pixel size of image sensors has been continuously reduced, and at the same time, electronic products such as mobile phones are constantly pursuing light weight, small size and good performance. This has forced camera lenses to continue to pursue miniaturization.

[0005] There is a need for a camera lens that is miniaturized and has at least one beneficial effect such as good imaging clarity, long focal length or light weight. Summary of the invention

[0006] The present application provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens; and a third lens; wherein the equivalent length TL of the actual propagation distance of the principal light from the object side of the first lens to the imaging surface in the air and the entrance pupil diameter EPD of the camera lens can satisfy: 3.5<TL / EPD<4.0.

[0007] In one embodiment, the first to third lenses include at least one plastic lens.

[0008] In one embodiment, at least one aspherical mirror surface is provided from the object side surface of the first lens to the image side surface of the third lens.

[0009] In one embodiment, the total effective focal length f of the camera lens and the maximum half field of view Semi-FOV of the camera lens may satisfy: f×tan(Semi-FOV)>5.0.

[0010] In one embodiment, the total effective focal length f of the camera lens may satisfy: f≥40 mm.

[0011] In one embodiment, the total effective focal length f of the camera lens and the effective focal length f1 of the first lens may satisfy: 1.5<f / f1<3.5.

[0012] In one embodiment, the total effective focal length f of the camera lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens may satisfy: -3.1<f / f2+f / f3<0.

[0013] In one embodiment, the total effective focal length f of the camera lens and the equivalent length FL of the actual propagation distance of the principal light from the image side surface of the third lens to the imaging surface in the air may satisfy: 1.2<f / FL<1.6.

[0014] In one embodiment, the refractive index N2 of the second lens and the refractive index N3 of the third lens may satisfy: 1.6<(N2+N3) / 2<1.7.

[0015] In one embodiment, the dispersion coefficient V2 of the second lens and the dispersion coefficient V3 of the third lens may satisfy: |V2-V3|<10.

[0016] In one embodiment, a curvature radius R1 of the object-side surface of the first lens and a center thickness CT1 of the first lens may satisfy: 1.5<R1 / CT1<3.0.

[0017] In one embodiment, a curvature radius R5 of the object-side surface of the third lens and a curvature radius R6 of the image-side surface of the third lens may satisfy: 0<R5 / R6<1.0.

[0018] In one embodiment, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the center thickness CT3 of the third lens may satisfy: 1.0<CT1 / (CT2+CT3)<2.5.

[0019] In one embodiment, the spacing distance T12 between the first lens and the second lens on the optical axis and the center thickness CT2 of the second lens may satisfy: 1.5<T12 / CT2<3.0.

[0020] In one embodiment, the camera lens further includes: at least one reflector, which is arranged in the object side direction of the first lens or the image side direction of the third lens, and the reflective surface of the reflector is used to deflect the optical axis.

[0021] Another aspect of the present application provides a camera lens, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens; and a third lens; wherein the total effective focal length f of the camera lens and the equivalent length FL of the actual propagation distance of the main light from the image side surface of the third lens to the imaging surface in the air can satisfy: 1.2<f / FL<1.6.

[0022] In one embodiment, the total effective focal length f of the camera lens and the maximum half field of view Semi-FOV of the camera lens may satisfy: f×tan(Semi-FOV)>5.0.

[0023] In one embodiment, the equivalent length TL of the actual propagation distance of the principal ray from the object side surface of the first lens to the imaging surface in the air and the entrance pupil diameter EPD of the camera lens may satisfy: 3.5<TL / EPD<4.0.

[0024] In one embodiment, the total effective focal length f of the camera lens and the effective focal length f1 of the first lens may satisfy: 1.5<f / f1<3.5.

[0025] In one embodiment, the total effective focal length f of the camera lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens may satisfy: -3.1<f / f2+f / f3<0.

[0026] In one embodiment, the total effective focal length f of the camera lens may satisfy: f≥40 mm.

[0027] In one embodiment, the refractive index N2 of the second lens and the refractive index N3 of the third lens may satisfy: 1.6<(N2+N3) / 2<1.7.

[0028] In one embodiment, the dispersion coefficient V2 of the second lens and the dispersion coefficient V3 of the third lens may satisfy: |V2-V3|<10.

[0029] In one embodiment, a curvature radius R1 of the object-side surface of the first lens and a center thickness CT1 of the first lens may satisfy: 1.5<R1 / CT1<3.0.

[0030] In one embodiment, a curvature radius R5 of the object-side surface of the third lens and a curvature radius R6 of the image-side surface of the third lens may satisfy: 0<R5 / R6<1.0.

[0031] In one embodiment, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the center thickness CT3 of the third lens may satisfy: 1.0<CT1 / (CT2+CT3)<2.5.

[0032] In one embodiment, the spacing distance T12 between the first lens and the second lens on the optical axis and the center thickness CT2 of the second lens may satisfy: 1.5<T12 / CT2<3.0.

[0033] In one embodiment, the camera lens further includes: at least one reflector, which is arranged in the object side direction of the first lens or the image side direction of the third lens, and the reflective surface of the reflector is used to deflect the optical axis.

[0034] In one embodiment, the first to third lenses include at least one plastic lens.

[0035] In one embodiment, at least one aspherical mirror surface is provided from the object side surface of the first lens to the image side surface of the third lens.

[0036] The present application adopts three lenses, and through the reasonable allocation of the optical focal length, surface shape, center thickness of each lens and axial spacing between each lens, the above-mentioned optical imaging lens has at least one beneficial effect of miniaturization, light weight, good imaging clarity and long focus. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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:

[0038] Figure 1 A schematic structural diagram of a camera lens according to Embodiment 1 of the present application is shown; FIG. 2A to FIG. 2D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging lens of Example 1 are respectively shown;

[0039] Figure 3 A schematic structural diagram of a camera lens according to Embodiment 2 of the present application is shown;

[0040] Figure 4 A schematic structural diagram of a camera lens according to Embodiment 3 of the present application is shown; FIG. 5A to FIG. 5D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the camera lens of Example 3 are respectively shown;

[0041] Figure 6 A schematic structural diagram of a camera lens according to Embodiment 4 of the present application is shown; FIG. 7A to FIG. 7D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the camera lens of Example 4 are respectively shown;

[0042] Figure 8 A schematic structural diagram of a camera lens according to Embodiment 5 of the present application is shown; 9A to 9DThe axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging lens of Example 5 are respectively shown;

[0043] Fig.10 A schematic structural diagram of a camera lens according to Embodiment 6 of the present application is shown; FIG. 11A to FIG. 11D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging lens of Example 6 are respectively shown;

[0044] Fig.12 A schematic structural diagram of a camera lens according to Embodiment 7 of the present application is shown; FIG. 13A to FIG. 13D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging lens of Example 7 are respectively shown;

[0045] Fig.14 A schematic structural diagram of a camera lens according to Embodiment 8 of the present application is shown; FIG. 15A to FIG. 15D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Example 8 are respectively shown. DETAILED DESCRIPTION

[0046] 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.

[0047] 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.

[0048] 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.

[0049] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

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

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

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

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

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

[0055] In an exemplary embodiment, the first lens may have positive optical power. The second lens may have positive optical power or negative optical power. The third lens may have positive optical power or negative optical power. The low-order aberrations of the camera lens may be balanced by properly controlling the positive and negative distribution of the optical power of each component of the camera lens.

[0056] In an exemplary embodiment, the camera lens further includes: at least one reflector. For example, a first reflector is included, which is arranged on the object side of the first lens, and the reflective surface of the first reflector is used to deflect the optical axis. For example, a second reflector is included, which can be arranged on the image side of the third lens, and the reflective surface of the second reflector is used to deflect the optical axis. The imaging surface is located on the image side of the second reflector. Providing a reflector can reduce the total length of the camera lens in a single direction, which is conducive to installation in devices such as mobile phones with limited space. Optionally, the reflector can be a total reflector, a prism or other optical element that deflects the optical axis. Exemplarily, the first reflector and the second reflector are both prisms. Exemplarily, the first reflector and the second reflector are both plane glass mirrors.

[0057] In an exemplary embodiment, the camera lens of the present application may satisfy the condition f≥40mm, where f is the total effective focal length of the camera lens. The camera lens satisfies f≥40mm, which can ensure that it has a sufficient focal length and a telephoto effect. More specifically, f may satisfy: 40mm≤f≤50mm.

[0058] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula f×tan(Semi-FOV)>5.0, where f is the total effective focal length of the camera lens, and Semi-FOV is the maximum half field of view angle of the camera lens. The camera lens satisfies f×tan(Semi-FOV)>5.0 and may have a sufficient field of view angle, thereby reducing the interference of shaking on imaging when using the camera lens. More specifically, f and Semi-FOV may satisfy: 5.10<f×tan(Semi-FOV)<6.20.

[0059] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula 3.5<TL / EPD<4.0, wherein TL is the equivalent length of the actual propagation distance of the principal ray from the object side of the first lens to the imaging surface in the air, and EPD is the entrance pupil diameter of the camera lens. The light incident on the camera lens has a principal ray. Exemplarily, the principal ray may propagate along the optical axis. The camera lens satisfies 3.5<TL / EPD<4.0, which can control the length from the lens group to the imaging surface to avoid affecting the total length of the camera lens group, thereby ensuring the miniaturization feature of the camera lens group. More specifically, TL and EPD may satisfy: 3.60<TL / EPD<3.93.

[0060] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula 1.5<f / f1<3.5, where f is the total effective focal length of the camera lens, and f1 is the effective focal length of the first lens. The camera lens satisfies 1.5<f / f1<3.5, which is conducive to ensuring high image quality while taking into account good processability. If the positive focal length of the first lens is too long, it is not conducive to correcting aberrations, and if it is too short, it is not conducive to processing. More specifically, f and f1 may satisfy: 1.88<f / f1<3.08.

[0061] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula -3.1<f / f2+f / f3<0, wherein f is the total effective focal length of the camera lens, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens. The camera lens satisfies -3.1<f / f2+f / f3<0, which can ensure that the second lens and the third lens have negative optical power as a whole, and further ensure that when the length of the camera lens is within a limited size, the effective focal length of the camera lens is maximized as much as possible. More specifically, f, f2, and f3 may satisfy: -3.05<f / f2+f / f3<-0.85.

[0062] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula 1.2<f / FL<1.6, where f is the total effective focal length of the camera lens, and FL is the equivalent length of the actual propagation distance of the principal ray from the image side surface of the third lens to the imaging surface in the air. The camera lens satisfies 1.2<f / FL<1.6, which can ensure that the total effective focal length is greater than the actual length of the camera lens. More specifically, f and FL may satisfy: 1.35<f / FL<1.55.

[0063] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula 1.6<(N2+N3) / 2<1.7, where N2 is the refractive index of the second lens and N3 is the refractive index of the third lens. The camera lens satisfies 1.6<(N2+N3) / 2<1.7, which can make the second lens and the third lens have high refractive index, and then these two lenses can cooperate with the first lens to reduce chromatic aberration.

[0064] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula |V2-V3|<10, where V2 is the dispersion coefficient of the second lens and V3 is the dispersion coefficient of the third lens. The camera lens satisfies |V2-V3|<10, so that the second lens and the third lens can cooperate well with the first lens to reduce chromatic aberration. More specifically, V2 and V3 may satisfy: 4.5<|V2-V3|<5.

[0065] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula 1.5<R1 / CT1<3.0, where R1 is the radius of curvature of the object side of the first lens, and CT1 is the center thickness of the first lens. The camera lens satisfies 1.5<R1 / CT1<3.0, which can effectively reduce spherical aberration and astigmatism. More specifically, R1 and CT1 may satisfy: 1.85<R1 / CT1<2.70.

[0066] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula 0<R5 / R6<1.0, where R5 is the radius of curvature of the object side of the third lens, and R6 is the radius of curvature of the image side of the third lens. The camera lens satisfies 0<R5 / R6<1.0, which can make the third lens have good processability. More specifically, R5 and R6 can satisfy: 0<R5 / R6<0.75.

[0067] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula 1.0<CT1 / (CT2+CT3)<2.5, wherein CT1 is the center thickness of the first lens, CT2 is the center thickness of the second lens, and CT3 is the center thickness of the third lens. The camera lens satisfies 1.0<CT1 / (CT2+CT3)<2.5, which can control the thickness of each lens on the optical axis, thereby effectively taking into account both processability and image quality. If the center thickness of the second lens and the center thickness of the third lens are too large, it is not conducive to the correction of monochromatic aberrations. If the two are too small, it is not conducive to assembly. More specifically, CT1, CT2 and CT3 may satisfy: 1.30<CT1 / (CT2+CT3)<2.48.

[0068] In an exemplary embodiment, the camera lens of the present application may satisfy the conditional formula 1.5<T12 / CT2<3.0, wherein T12 is the spacing distance between the first lens and the second lens on the optical axis, and CT2 is the center thickness of the second lens. The camera lens satisfies 1.5<T12 / CT2<3.0, which is conducive to ensuring the high imaging quality of the camera lens and miniaturizing the camera lens. More specifically, T12 and CT2 satisfy: 1.65<T12 / CT2<2.75.

[0069] In one embodiment, the first lens to the third lens include at least one plastic lens. The plastic lens can make the camera lens lighter while ensuring the imaging quality as much as possible.

[0070] In an exemplary embodiment, the camera lens may further include at least one aperture. The aperture may be disposed at an appropriate position as required, for example, between the object side and the first lens. Optionally, the camera lens may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0071] The camera lens according to the above-mentioned embodiment of the present application may use multiple lenses, such as the three lenses described above. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, the size of the camera lens can be effectively reduced, the sensitivity of the camera lens can be reduced, and the processability of the camera lens can be improved. At the same time, the camera lens of the present application also has excellent optical properties such as telephoto and good imaging clarity.

[0072] In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object side surface of the first lens to the image side surface of the third lens is an aspherical mirror surface. The characteristic of the aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each lens in the first lens, the second lens and the third lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each lens in the first lens, the second lens and the third lens are all aspherical mirror surfaces.

[0073] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the camera lens can be changed to obtain the various results and advantages described in this specification. For example, although three lenses are described as an example in the embodiment, the camera lens is not limited to including three lenses. If necessary, the camera lens may also include other numbers of lenses.

[0074] Specific embodiments of the imaging lens applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0075] Example 1

[0076] The following reference Figures 1 to 2D An imaging lens according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of a camera lens according to Embodiment 1 of the present application is shown.

[0077] like Figure 1 As shown, the camera lens 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 and a filter E4.

[0078] The first lens E1 has positive power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is concave. The filter E4 has an object side surface S7 and an image side surface S8. The camera lens has an imaging surface S9, and the light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0079] Table 1 shows basic parameters of the camera lens of Example 1, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0080]

[0081] Table 1

[0082] In Example 1, the total effective focal length f of the imaging lens is 40.00 mm, and the aperture number Fno of the imaging lens is 4.0.

[0083] In Embodiment 1, the object side surface and the image side surface of any lens among the first lens E1 to the third lens E3 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0084]

[0085] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the high-order coefficients A that can be used for each aspheric mirror surface S1 to S6 in Example 1 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 and A 18 .

[0086]

[0087]

[0088] Table 2

[0089] Figure 2A The axial chromatic aberration curve of the imaging lens of Example 1 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the lens. Figure 2BThe astigmatism curve of the imaging lens of Example 1 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 2C The distortion curve of the camera lens 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 camera lens of Example 1 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 2A to FIG. 2D It can be seen that the camera lens provided in Example 1 can achieve good imaging quality.

[0090] Example 2

[0091] Refer to Example 1 and Figure 3 Compared with the camera lens provided in Example 1, the camera lens according to Example 2 of the present application further includes a first reflector P1 and a second reflector P2. Exemplarily, the material of the first reflector P1 is glass, and the material of the second reflector P2 is glass. Exemplarily, the first reflector P1 is a total reflector including a reflective surface. The second reflector P2 is a prism, and the prism includes an object side surface, a reflective surface, and an image side surface arranged from the object side to the image side along the optical axis direction.

[0092] The first reflector P1 is arranged on the object side of the first lens E1, and the angle between its reflective surface and the optical axis is 45°. The first reflector P1 is used to deflect the optical axis by 90°. The second reflector P2 is arranged between the third lens E3 and the filter E4, and the angle between its reflective surface and the optical axis is 45°. The second reflector P2 is used to deflect the optical axis by 90°.

[0093] Table 3 shows the basic parameters of the camera lens of Example 2, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0094]

[0095] Table 3

[0096] In Example 2, the total effective focal length f of the camera lens is 40.00 mm, and the aperture number Fno of the camera lens is 4.0. The camera lens provided in Example 2 can achieve good imaging quality and has a relatively short dimension in the optical axis direction of the lens group.

[0097] Example 3

[0098] The following reference Figures 4 to 5D The imaging lens according to Embodiment 3 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 4 A schematic structural diagram of a camera lens according to Embodiment 3 of the present application is shown.

[0099] like Figure 4 As shown, the camera lens 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 and a filter E4.

[0100] The first lens E1 has positive power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is concave. The filter E4 has an object side surface S7 and an image side surface S8. The camera lens has an imaging surface S9, and the light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0101] In Example 3, the total effective focal length f of the imaging lens is 40 mm, and the aperture number Fno of the imaging lens is 4.0.

[0102] Table 4 shows the basic parameters of the camera lens of Example 3, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 5 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0103]

[0104] Table 4

[0105] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 1.3535E-01 5.4692E-03 7.7583E-04 8.7696E-05 1.0756E-05 1.3134E-06 1.4473E-07 0.0000E+00 S2 2.8421E-01 -3.0905E-02 3.1711E-03 -5.5795E-04 1.4432E-04 -1.4516E-05 2.0559E-06 0.0000E+00 S3 4.4099E-02 -7.6868E-03 1.0703E-03 -7.9124E-05 3.1284E-06 -6.2704E-08 0.0000E+00 0.0000E+00 S4 -2.2564E-01 3.5583E-02 -2.6642E-03 1.1183E-03 -2.7727E-04 2.2572E-05 -4.1540E-07 0.0000E+00 S5 -6.2749E-01 3.6566E-02 -7.7446E-03 2.1641E-03 -7.9790E-04 2.2881E-04 -1.4390E-05 -1.5569E-07 S6 -4.1469E-01 2.5441E-02 -7.1183E-03 2.2026E-03 -8.5197E-04 3.4930E-04 -4.7817E-05 -7.8063E-08

[0106] Table 5

[0107] Figure 5A The axial chromatic aberration curve of the imaging lens of Example 3 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the lens. Figure 5B The astigmatism curve of the imaging lens of Example 3 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 5C The distortion curve of the camera lens of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 5D The chromatic aberration curve of the camera lens of Example 3 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 5A to FIG. 5D It can be seen that the camera lens provided in Example 3 can achieve good imaging quality.

[0108] Example 4

[0109] The following reference Figures 6 to 7D An imaging lens according to Embodiment 4 of the present application is described. Figure 6A schematic structural diagram of a camera lens according to Embodiment 4 of the present application is shown.

[0110] like Figure 6 As shown, the camera lens 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 and a filter E4.

[0111] The first lens E1 has positive power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is concave. The filter E4 has an object side surface S7 and an image side surface S8. The camera lens has an imaging surface S9, and the light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0112] In Embodiment 4, the total effective focal length f of the imaging lens is 45 mm, and the aperture number Fno of the imaging lens is 4.0.

[0113] Table 6 shows the basic parameters of the camera lens of Example 4, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 7 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0114]

[0115] Table 6

[0116] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 1.9432E-01 3.3906E-02 5.0778E-03 1.1410E-03 -6.6170E-06 -1.5613E-04 1.9649E-05 1.4131E-06 S2 4.4427E-01 -2.8415E-02 -9.5257E-03 5.6112E-04 -1.9637E-03 -3.8187E-05 1.8771E-04 1.4115E-06 S3 2.0689E+00 -3.0894E-01 6.7953E-02 -1.6277E-02 1.3698E-03 -1.7346E-04 8.1213E-05 -4.0069E-07 S4 1.3969E+00 -1.8786E-01 4.9449E-02 -6.7569E-03 -3.0570E-04 2.5486E-04 -5.1795E-05 -2.0704E-07 S5 -6.8482E-01 -1.7039E-02 5.9294E-03 8.2019E-05 -1.6987E-03 1.8530E-04 -3.7948E-05 -1.0404E-06 S6 -6.2059E-01 -1.7305E-02 4.9000E-03 -5.6570E-04 -1.4362E-03 2.9084E-04 -6.9751E-05 -2.5269E-07

[0117] Table 7

[0118] Fig. 7A The axial chromatic aberration curve of the imaging lens of Example 4 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the lens. Figure 7B The astigmatism curve of the imaging lens of Example 4 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 7C The distortion curve of the camera lens of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.7D The magnification chromatic aberration curve of the camera lens of Example 4 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 7A to FIG. 7D It can be seen that the camera lens provided in Example 4 can achieve good imaging quality.

[0119] Example 5

[0120] The following reference Figures 8 to 9DThe imaging lens according to Embodiment 5 of the present application is described. Figure 8 A schematic structural diagram of a camera lens according to embodiment 5 of the present application is shown.

[0121] like Figure 8 As shown, the camera lens 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 and a filter E4.

[0122] The first lens E1 has positive power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is concave, and the image side surface S4 is convex. The third lens E3 has negative power, its object side surface S5 is concave, and the image side surface S6 is convex. The filter E4 has an object side surface S7 and an image side surface S8. The camera lens has an imaging surface S9, and the light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0123] In Example 5, the total effective focal length f of the imaging lens is 40 mm, and the aperture number Fno of the imaging lens is 4.0.

[0124] Table 8 shows the basic parameter table of the camera lens of Example 5, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 9 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 5, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0125]

[0126] Table 8

[0127] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.1215E-02 2.4889E-02 -4.8088E-04 -6.3988E-04 1.1058E-04 -5.5105E-06 1.0971E-07 0.0000E+00 0.0000E+00 S2 -8.5113E-02 1.2489E-02 -3.6210E-03 -3.0421E-03 1.7216E-03 -2.9070E-04 1.6227E-05 0.0000E+00 0.0000E+00 S3 1.0237E+00 -2.1970E-01 4.6823E-02 -1.1070E-02 3.3763E-03 -6.8058E-04 6.0077E-05 3.7364E-07 0.0000E+00 S4 1.4585E+00 -2.6142E-01 5.2122E-02 -5.4306E-03 -6.6916E-04 2.8942E-04 -2.6176E-05 -9.4510E-08 0.0000E+00 S5 8.0558E-01 -7.1917E-02 1.9530E-02 -8.8084E-04 -2.4877E-03 1.1644E-03 -1.3956E-04 -2.8734E-06 -8.5287E-08 S6 2.6081E-01 -1.6927E-02 3.8721E-03 3.0227E-04 -1.8026E-03 1.0925E-03 -2.8907E-04 -8.9735E-06 0.0000E+00

[0128] Table 9

[0129] Fig. 9A The axial chromatic aberration curve of the imaging lens of Example 5 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the lens. Fig. 9B The astigmatism curve of the imaging lens of Example 5 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig. 9C The distortion curve of the camera lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.9D The chromatic aberration curve of the camera lens of Example 5 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. 9A to 9D It can be seen that the camera lens provided in Example 5 can achieve good imaging quality.

[0130] Example 6

[0131] The following reference Figures 10 to 11D The imaging lens according to Embodiment 6 of the present application is described. Fig.10 A schematic structural diagram of a camera lens according to Example 6 of the present application is shown.

[0132] like Fig.10 As shown, the camera lens 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 and a filter E4.

[0133] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The filter E4 has an object side surface S7 and an image side surface S8. The camera lens has an imaging surface S9, and the light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0134] In Example 6, the total effective focal length f of the imaging lens is 40 mm, and the aperture number Fno of the imaging lens is 4.0.

[0135] Table 10 shows the basic parameter table of the camera lens of Example 6, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 11 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0136]

[0137] Table 10

[0138] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 1.6134E-01 4.5611E-03 5.9780E-04 5.1901E-05 4.7549E-06 3.6989E-07 8.1482E-09 0.0000E+00 S2 3.4894E-01 -4.3873E-02 5.8942E-03 -1.1302E-03 2.0999E-04 -1.0475E-05 2.8289E-05 1.0327E-07 S3 8.9997E-02 -1.2786E-02 1.2524E-03 -6.9217E-05 2.0995E-06 -3.1554E-08 0.0000E+00 0.0000E+00 S4 -3.3915E-01 6.1837E-02 -1.1035E-02 2.8314E-03 -4.6765E-04 3.3171E-05 -6.1360E-07 0.0000E+00 S5 -7.1323E-01 8.7066E-02 -2.1459E-02 4.7730E-03 -6.5679E-04 4.6539E-06 2.0922E-05 2.9515E-08 S6 -5.1784E-01 6.0090E-02 -1.8706E-02 4.8848E-03 -1.1126E-03 3.1628E-04 -3.8809E-05 -3.6172E-07

[0139] Table 11

[0140] Fig.11A The axial chromatic aberration curve of the imaging lens of Example 6 is shown, which indicates the deviation of the convergent focus of light of different wavelengths passing through the back of the lens. Fig. 11B The astigmatism curve of the imaging lens of Example 6 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig. 11C The distortion curve of the camera lens of Example 6 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.11D The magnification chromatic aberration curve of the camera lens of Example 6 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 11A to FIG. 11D It can be seen that the camera lens provided in Example 6 can achieve good imaging quality.

[0141] Example 7

[0142] The following reference Figures 12 to 13D An imaging lens according to Embodiment 7 of the present application is described. Fig.12 A schematic structural diagram of a camera lens according to Embodiment 7 of the present application is shown.

[0143] like Fig.12 As shown, the camera lens 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 and a filter E4.

[0144] The first lens E1 has positive power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is concave. The filter E4 has an object side surface S7 and an image side surface S8. The camera lens has an imaging surface S9, and the light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0145] In Example 7, the total effective focal length f of the imaging lens is 48 mm, and the aperture number Fno of the imaging lens is 4.0.

[0146] Table 12 shows the basic parameters of the camera lens of Example 7, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 13 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 7, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0147]

[0148] Table 12

[0149] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.7787E-01 5.5461E-02 1.0012E-02 1.3209E-03 -4.1686E-04 -1.8160E-04 2.9813E-05 3.4610E-06 7.2736E-07 S2 5.8716E-01 -7.2216E-02 -2.1311E-02 -4.7211E-03 -2.4749E-03 1.1441E-03 3.7636E-04 4.1700E-06 7.0954E-08 S3 2.4135E+00 -4.0409E-01 8.6674E-02 -2.8215E-02 3.7508E-03 -5.3530E-04 1.8186E-04 -1.6892E-06 0.0000E+00 S4 1.6331E+00 -2.1660E-01 6.5134E-02 -1.1077E-02 3.7239E-04 8.2162E-05 -1.8374E-04 -2.7660E-06 -1.3443E-07 S5 -7.7495E-01 -2.1429E-02 7.8044E-03 -2.1807E-03 -1.5128E-03 5.8166E-04 1.0981E-04 -9.6615E-07 0.0000E+00 S6 -7.5768E-01 -2.0843E-02 5.7227E-03 -2.5905E-03 -9.5045E-04 6.8160E-04 1.5504E-05 -2.5848E-07 0.0000E+00

[0150] Table 13

[0151] Fig.13A The axial chromatic aberration curve of the imaging lens of Example 7 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the lens. Fig. 13B The astigmatism curve of the imaging lens of Example 7 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig. 13C The distortion curve of the camera lens of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.13D The magnification chromatic aberration curve of the camera lens of Example 7 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 13A to FIG. 13DIt can be seen that the camera lens provided in Example 7 can achieve good imaging quality.

[0152] Example 8

[0153] The following reference Figures 14 to 15D An imaging lens according to Embodiment 8 of the present application is described. Fig.14 A schematic structural diagram of a camera lens according to Example 8 of the present application is shown.

[0154] like Fig.14 As shown, the camera lens 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 and a filter E4.

[0155] The first lens E1 has positive power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has negative power, its object side surface S5 is concave, and its image side surface S6 is convex. The filter E4 has an object side surface S7 and an image side surface S8. The camera lens has an imaging surface S9, and the light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0156] In Example 8, the total effective focal length f of the imaging lens is 40 mm, and the aperture number Fno of the imaging lens is 4.0.

[0157] Table 14 shows the basic parameter table of the camera lens of Example 8, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 15 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 8, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above-mentioned Example 1.

[0158]

[0159] Table 14

[0160] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.9597E-02 2.4288E-02 -9.1824E-04 -3.9362E-04 7.6330E-05 -3.3908E-06 9.7309E-08 0.0000E+00 0.0000E+00 S2 -9.2272E-02 1.3764E-02 -6.8735E-03 -1.9935E-03 1.5809E-03 -2.7713E-04 1.5120E-05 2.0724E-08 0.0000E+00 S3 9.1756E-01 -1.7320E-01 3.1216E-02 -6.1741E-03 2.7484E-03 -8.8746E-04 1.0343E-04 9.4762E-07 0.0000E+00 S4 1.4924E+00 -2.3821E-01 4.6259E-02 -2.9690E-03 -9.5353E-04 -5.4152E-05 7.7607E-05 1.0593E-08 0.0000E+00 S5 9.0486E-01 -8.8545E-02 2.7350E-02 -2.6324E-03 -2.2597E-03 1.2977E-03 -1.6863E-04 -3.7954E-06 -1.0885E-07 S6 2.5639E-01 -1.5242E-02 4.9324E-03 -4.4291E-04 -1.3996E-03 1.1710E-03 -3.5585E-04 -8.2084E-06 -2.8585E-07

[0161] Table 15

[0162] Fig.15A The axial chromatic aberration curve of the imaging lens of Example 8 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the lens. Fig. 15B The astigmatism curve of the imaging lens of Example 8 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig. 15C The distortion curve of the camera lens of Example 8 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.15DThe magnification chromatic aberration curve of the camera lens of Example 8 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 15A to FIG. 15D It can be seen that the camera lens provided in Example 8 can achieve good imaging quality.

[0163] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 16.

[0164] Conditional formula\Example 1 2 3 4 5 6 7 8 f×tan(Semi-FOV) 5.12 ← 5.12 5.76 5.12 5.12 6.15 5.12 TL / EPD 3.71 ← 3.63 3.68 3.90 3.67 3.64 3.92 f / f1 2.83 ← 2.68 2.71 2.22 3.02 2.76 1.90 f / FL 1.48 ← 1.52 1.53 1.38 1.50 1.53 1.37 f / f2+f / f3 -2.57 ← -2.47 -2.37 -1.35 -3.04 -2.43 -0.88 (N2+N3) / 2 1.66 ← 1.66 1.66 1.66 1.66 1.66 1.66 |V2-V3| 4.74 ← 4.74 4.74 4.74 4.74 4.74 4.74 R1 / CT1 2.00 ← 2.23 1.90 2.11 2.68 1.88 2.10 R5 / R6 0.57 ← 0.59 0.68 0.74 0.02 0.68 0.63 CT1 / (CT2+CT3) 1.83 ← 1.54 2.46 1.43 1.42 2.34 1.35 T12 / CT2 1.69 ← 2.11 2.71 1.67 2.17 2.59 1.92

[0165] Table 16

[0166] The present application also provides an imaging device, which is provided with an electronic photosensitive element for imaging, and the electronic photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the camera lens described above.

[0167] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of protection involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the present application. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical solution.

Claims

1. Camera lens, It is characterized in that Along the optical axis from the object side to the image side, they include: A first lens having positive optical power, whose object side surface is convex; a second lens having optical power and a concave object-side surface; and a third lens having optical power; At least one of the second lens and the third lens has negative optical power; The number of lenses having optical power in the camera lens is three; The total effective focal length f of the camera lens and the equivalent length FL of the actual propagation distance of the principal light from the image side surface of the third lens to the imaging surface in the air satisfy the following conditions: 1.35<f / FL<1.55; The total effective focal length f of the camera lens and the effective focal length f1 of the first lens satisfy the following: 1.88<f / f1≤3.

02.

2. The imaging lens according to claim 1, It is characterized in that The total effective focal length f of the camera lens and the maximum half field of view Semi-FOV of the camera lens satisfy: 5.10<f×tan(Semi-FOV)≤6.

15.

3. The imaging lens according to claim 1, It is characterized in that The equivalent length TL of the actual propagation distance of the principal light from the object side surface of the first lens to the imaging surface in the air and the entrance pupil diameter EPD of the camera lens satisfy the following: 3.60<TL / EPD<3.

93.

4. The imaging lens according to claim 1, It is characterized in that The total effective focal length f of the camera lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -3.05<f / f2+f / f3<-0.

85.

5. The imaging lens according to claim 4, It is characterized in that The total effective focal length f of the camera lens satisfies: 40mm≤f≤48mm.

6. The imaging lens according to claim 1, It is characterized in that A refractive index N2 of the second lens and a refractive index N3 of the third lens satisfy: 1.6<(N2+N3) / 2<1.

7.

7. The imaging lens according to claim 1, It is characterized in that The dispersion coefficient V2 of the second lens and the dispersion coefficient V3 of the third lens satisfy: 4.5<|V2-V3|<5.

8. The imaging lens according to claim 1, It is characterized in that A curvature radius R1 of the object-side surface of the first lens and a center thickness CT1 of the first lens satisfy: 1.85<R1 / CT1<2.

70.

9. The imaging lens according to claim 1, It is characterized in that A curvature radius R5 of the object-side surface of the third lens and a curvature radius R6 of the image-side surface of the third lens satisfy: 0<R5 / R6<0.

75.

10. The imaging lens according to any one of claims 1 to 9, It is characterized in that The center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the center thickness CT3 of the third lens satisfy: 1.35≤CT1 / (CT2+CT3)<2.

5.

11. The imaging lens according to any one of claims 1 to 9, It is characterized in that The spacing distance T12 between the first lens and the second lens on the optical axis and the center thickness CT2 of the second lens satisfy: 1.65<T12 / CT2<2.

75.

12. The imaging lens according to any one of claims 1 to 9, It is characterized in that Also includes: At least one reflector, wherein the reflector is arranged on the object side of the first lens or on the image side of the third lens, and a reflective surface of the reflector is used to deflect the optical axis.

13. The imaging lens according to any one of claims 1 to 9, It is characterized in that The first lens to the third lens include at least one plastic lens; At least one aspherical mirror surface is included from the object side surface of the first lens to the image side surface of the third lens.

Images