Mobile phone lens

Abstract

The invention discloses a mobile phone lens. The mobile phone lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from an object side to an image side, the first lens, the third lens and the sixth lens have positive focal power, and the second lens, the fourth lens, the seventh lens and the eighth lens have negative focal power; the focal length f6 of the sixth lens and the focal length f of the mobile phone lens meet the condition that f6 / f is larger than or equal to 0.5 and smaller than or equal to 1.5. According to the mobile phone lens, miniaturization of the lens is facilitated, and the size of a large-target-surface mobile phone camera module is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular to a mobile phone lens. Background Art

[0002] With the development of multifunctional electronic devices such as mobile phones, people have gradually become accustomed to taking photos and videos through mobile phones. Therefore, taking pictures through mobile phone lenses has become an essential function of mobile phones.

[0003] However, people still have a demand for miniaturized mobile phones, so mobile phone lenses also need to be miniaturized, but large-surface mobile phone camera modules have the problem of being too large in size. Therefore, it is necessary to provide a miniaturized mobile phone lens. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to provide a mobile phone lens, which is conducive to the miniaturization of the lens and effectively reduces the size of the large-target mobile phone camera module. The present invention provides a mobile phone lens, which comprises a first lens to an eighth lens in sequence from the object side to the image side; the first lens, the third lens and the sixth lens have positive optical focal length, and the second lens, the fourth lens, the seventh lens and the eighth lens have negative optical focal length; wherein the focal length f6 of the sixth lens and the focal length f of the mobile phone lens satisfy: 0.5≤f6 / f≤1.5.

[0005] Optionally, the focal length f1 of the first lens and the focal length f of the mobile phone lens satisfy: 1≤f1 / f≤1.5.

[0006] Optionally, the object side surface of the second lens is convex, the image side surface of the second lens is concave, and the object side surface curvature radius L2R1 of the second lens satisfies 5 mm. <L2R1<15mm。

[0007] Optionally, a diameter D4 of the object-side surface of the first lens and a diameter D5 of the image-side surface of the second lens satisfy: -0.2 mm ≤ D4 - D5 ≤ 0.2 mm.

[0008] Optionally, the object side surface of the sixth lens is concave, the image side surface of the sixth lens is convex, and the object side surface curvature radius L6R1 of the sixth lens satisfies -50 mm <L6R1<-10mm。

[0009] Optionally, the object side surface of the seventh lens is convex at the paraxial position, the image side surface of the seventh lens is concave at the paraxial position, and at least one of the object side surface and the image side surface of the seventh lens has at least one inflection point.

[0010] Optionally, a sag S15 on the image-side surface of the seventh lens and a sag S16 on the object-side surface of the seventh lens satisfy: -0.5 mm ≤ S15 - S16 ≤ 0.5 mm.

[0011] Optionally, the object side surface of the eighth lens is concave at the paraxial position, the image side surface of the eighth lens is concave at the paraxial position, and at least one of the object side surface and the image side surface of the eighth lens has at least one inflection point.

[0012] Optionally, a refractive index N1 of the first lens and a refractive index N8 of the eighth lens satisfy: -0.25≤N1-N8≤0.25.

[0013] Optionally, a sag height S15 of the image side surface of the seventh lens and a sag height S17 of the image side surface of the eighth lens satisfy: 0.5 mm ≤ S15 - S17 ≤ 1 mm.

[0014] The mobile phone lens provided by the present invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from the object side to the image side in sequence; the first lens, the third lens and the sixth lens have positive focal power, and the second lens, the fourth lens, the seventh lens and the eighth lens have negative focal power. According to the focal power distribution of the first lens to the eighth lens, and by reasonably allocating the focal power, spacing and refractive index of each lens, the effects of large target surface, large aperture and short optical total length can be achieved, so as to be used for mobile phone lenses with ultra-large target surfaces such as 1 inch. Among them, the focal length f6 of the sixth lens and the focal length f of the mobile phone lens satisfy: 0.5≤f6 / f≤1.5, and the ratio of the focal length f6 of the sixth lens to the focal length f of the mobile phone lens can be controlled to adjust the optical path difference within a certain range, optimize the field curvature of the system, make the focal power distribution of the lens more reasonable, effectively balance the aberration, improve the resolution of the lens, and also help to improve the stability of the lens assembly, which is conducive to the miniaturization of the lens and effectively reduces the size of the large target surface mobile phone camera module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic structural diagram of a mobile phone lens according to an embodiment of the present application is shown.

[0017] Figure 2 A schematic structural diagram of a mobile phone lens according to Example 1 of the present application is shown.

[0018] Figures 3 to 7 The light fan diagram, axial aberration diagram, vertical axis chromatic aberration diagram, relative illumination and Y field of view angle diagram and MTF curve diagram of the mobile phone lens of Example 1 are respectively shown.

[0019] Figure 8 A schematic structural diagram of a mobile phone lens according to Example 2 of the present application is shown.

[0020] Figures 9 to 13 The light fan diagram, axial aberration diagram, vertical axis chromatic aberration diagram, relative illumination and Y field of view angle diagram and MTF curve diagram of the mobile phone lens of Example 2 are respectively shown.

[0021] Fig.14 A schematic structural diagram of a mobile phone lens according to Example 3 of the present application is shown.

[0022] Figures 15 to 19 The light fan diagram, axial aberration diagram, vertical axis chromatic aberration diagram, relative illumination and Y field of view angle diagram and MTF curve diagram of the mobile phone lens of Example 3 are respectively shown.

[0023] Fig. 20 A schematic structural diagram of a mobile phone lens according to Example 4 of the present application is shown.

[0024] Figure 21 to Figure 25 The light fan diagram, axial aberration diagram, vertical axis chromatic aberration diagram, relative illumination and Y field of view angle diagram and MTF curve diagram of the mobile phone lens of Example 4 are respectively shown. DETAILED DESCRIPTION

[0025] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. Through the description of the specific implementation methods, the technical means and effects adopted by the present invention to achieve the intended purpose can be more deeply and specifically understood. However, the attached drawings are only for reference and illustration purposes, and are not used to limit the present invention. Some well-known parts may not be shown. In each of the drawings, the same elements are represented by similar reference numerals. For the sake of clarity, the various parts in the drawings are not necessarily drawn strictly in accordance with the actual proportions.

[0026] It should be understood that the terms "first", "second", "third", "fourth", etc. are only used to distinguish components or circuits with similar properties, rather than indicating or implying relative importance or a specific order. The terms "include", "comprises", or any other variation thereof, are intended to cover non-exclusive inclusion, and may include other elements not explicitly listed in addition to those listed elements.

[0027] 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.

[0028] 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 IMG is called the image side of the lens.

[0029] 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.

[0030] The features, principles and other aspects of the present application are described in detail below.

[0031] Figure 1 Schematic diagram of the structure of a mobile phone lens according to an embodiment of the present application is shown. According to an exemplary embodiment of the present application, the mobile phone lens, such as Figure 1 As shown, from the object side to the image side, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are included in sequence; the first lens L1, the third lens L3 and the sixth lens L6 have positive focal power, and the second lens L2, the fourth lens L4, the seventh lens L7 and the eighth lens L8 have negative focal power. According to the focal power distribution of the first lens L1 to the eighth lens L8, and by reasonably allocating the focal power, spacing and refractive index of each lens, the effects of large target surface, large aperture and short optical total length can be achieved, so as to be used for mobile phone lenses with ultra-large target surface of 1 inch. Among them, the focal length f6 of the sixth lens L6 and the focal length f of the mobile phone lens satisfy: 0.5≤f6 / f≤1.5. By controlling the ratio of the focal length f6 of the sixth lens L6 to the focal length f of the mobile phone lens, the optical path difference can be adjusted within a certain range, and the field curvature of the system can be optimized. The optical focal length distribution of the lens can be made more reasonable, and the aberrations can be effectively balanced. The image resolution of the lens can be improved, and it can also help to improve the stability of the lens assembly, which is beneficial to the miniaturization of the lens and effectively reduce the size of the mobile phone camera module with a large target surface.

[0032] In an exemplary embodiment, the mobile phone lens according to the present application can satisfy 1 ≤ f1 / f ≤ 1.5, where the focal length of the first lens L1 is f1 and the focal length of the mobile phone lens is f. By controlling the ratio of the focal length f1 of the first lens L1 to the focal length f of the mobile phone lens within an appropriate range, it is beneficial to converge light within a certain range and reduce the lens height.

[0033] In an exemplary embodiment, for the mobile phone lens according to the present application, the object side of the second lens L2 is convex, the image side of the second lens L2 is concave, and the radius of curvature L2R1 of the object side of the second lens L2 satisfies 5 mm < L2R1 < 15 mm. By controlling the radius of curvature L2R1 of the object side of the second lens L2, the imaging effect can be controlled and the imaging quality of the optical system can be improved.

[0034] In an exemplary embodiment, the mobile phone lens according to the present application can satisfy -0.2 mm ≤ D4 - D5 ≤ 0.2 mm, where D4 is the diameter of the object side of the first lens L1 and D5 is the diameter of the image side of the second lens L2. By satisfying -0.2 mm ≤ D4 - D5 ≤ 0.2 mm and controlling the difference between the diameter D4 of the object side of the first lens L1 and the diameter D5 of the image side of the second lens L2 to make them relatively close, the off-axis aberration can be reduced and the imaging quality can be improved.

[0035] In an exemplary embodiment, for the mobile phone lens according to the present application, the object side of the sixth lens L6 is concave, the image side of the sixth lens L6 is convex, and the radius of curvature L6R1 of the object side of the sixth lens L6 satisfies -50 mm < L6R1 < -10 mm. By controlling the radius of curvature L2R1 of the object side of the sixth lens L6, the imaging effect can be controlled and the imaging quality of the optical system can be improved.

[0036] In an exemplary embodiment, for the mobile phone lens according to the present application, the object side of the seventh lens L7 is convex near the optical axis, the image side of the seventh lens L7 is concave near the optical axis, and at least one of the object side and the image side of the seventh lens L7 has at least one inflection point. By controlling the surface shape of the seventh lens L7, the relative illuminance at the edge of the camera lens can be further improved and the resolution of the camera lens can be increased.

[0037] In an exemplary embodiment, the mobile phone lens according to the present application can satisfy -0.5 mm ≤ S15 - S16 ≤ 0.5 mm, where S15 is the sag of the image side of the seventh lens L7 and S16 is the sag of the object side of the seventh lens L7. By satisfying -0.5 mm ≤ S15 - S16 ≤ 0.5 mm and controlling the difference between the sag S15 of the image side of the seventh lens L7 and the sag S16 of the object side of the seventh lens L7 to make them relatively close, the off-axis aberration can be reduced and the imaging quality can be improved.

[0038] In an exemplary embodiment, according to the mobile phone lens of the present application, the object side surface of the eighth lens L8 is concave at the paraxial position, the image side surface of the eighth lens L8 is concave at the paraxial position, and at least one of the object side surface and the image side surface of the eighth lens L8 has at least one inflection point. The eighth lens L8 can be in the shape of a telephone handset. Controlling the surface shape of the eighth lens L8 can further improve the relative illumination of the edge of the camera lens and improve the resolution of the camera lens.

[0039] In an exemplary embodiment, the mobile phone lens according to the present application may satisfy -0.25≤N1-N8≤0.25, wherein the refractive index of the first lens L1 is N1, and the refractive index of the eighth lens L8 is N8. Satisfying -0.25≤N1-N8≤0.25, by controlling the difference between the refractive index N1 of the first lens L1 and the refractive index N8 of the eighth lens L8, it is beneficial to control spherical aberration and improve the imaging effect of the lens.

[0040] In an exemplary embodiment, the mobile phone lens according to the present application can satisfy 0.5mm≤S15-S17≤1mm, wherein the sagittal height of the image side surface of the seventh lens L7 is S15, and the sagittal height of the image side surface of the eighth lens L8 is S17. Satisfying 0.5mm≤S15-S17≤1mm, by controlling the difference between the sagittal height S15 of the image side surface of the seventh lens L7 and the sagittal height S17 of the image side surface of the eighth lens L8, it is beneficial to reduce the backbend and suppress the system stray light.

[0041] In an exemplary embodiment, according to the mobile phone lens of the present application, the mobile phone lens also includes an aperture STO, and the aperture STO can be arranged on the object side of the first lens L1, and can also be arranged between adjacent lenses.

[0042] In an exemplary embodiment, according to the mobile phone lens of the present application, the mobile phone lens also includes a filter IR for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface IMG.

[0043] Based on the same inventive concept, according to the electronic device of the exemplary embodiment of the present application, the electronic device includes the above-mentioned mobile phone lens. The electronic device includes but is not limited to a smart phone, a tablet computer, a laptop computer, a PTZ shooting device, a surveillance camera, and other imaging devices. The implementation of the electronic device can refer to the embodiment of the mobile phone lens, and the repetitions will not be repeated.

[0044] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiments, the optical imaging lens is not limited to including eight lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0045] The following further describes a specific embodiment of the mobile phone lens applicable to the above-mentioned embodiment with reference to the accompanying drawings.

[0046] Example 1 The following reference Figure 2 Describe the mobile phone lens according to Example 1 of the present application.

[0047] The mobile phone lens of Example 1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8 from the object side to the image side. The aperture STO can be arranged on the object side of the first lens L1. The filter IR can be arranged between the eighth lens L8 and the imaging surface IMG.

[0048] The first lens L1 has positive power, and its object side surface is convex, and its image side surface is concave. The second lens L2 has negative power, and its object side surface is convex, and its image side surface is concave. The third lens L3 has positive power, and its object side surface is convex, and its image side surface is convex. The fourth lens L4 has negative power, and its object side surface is concave, and its image side surface is convex. The fifth lens L5 has negative power, and its object side surface is concave, and its image side surface is concave. The sixth lens L6 has positive power, and its object side surface is concave, and its image side surface is convex. The seventh lens L7 has negative power, and its object side surface is convex, and its image side surface is concave. The eighth lens L8 has negative power, and its object side surface is concave, and its image side surface is concave. The filter IR has an object side surface and an image side surface. Light from the object passes through the object side surfaces and image side surfaces of the first lens L1 to the eighth lens L8 and the filter IR in sequence, and is finally imaged on the imaging surface IMG.

[0049] Table 1 shows the basic parameter table of the mobile phone lens of Example 1, wherein the units of the radius of curvature, thickness, focal length, semi-aperture and sagittal height are all in millimeters (mm).

[0050] Table 1:

[0051] Wherein, L1 R1 represents the object-side surface of the first lens L1, L1 R2 represents the image-side surface of the first lens L1, L2 R1 represents the object-side surface of the second lens L2, L2 R2 represents the image-side surface of the second lens L2, L3 R1 represents the object-side surface of the third lens L3, L3 R2 represents the image-side surface of the third lens L3, L4 R1 represents the object-side surface of the fourth lens L4, L4 R2 represents the image-side surface of the fourth lens L4, L5 R1 represents the object-side surface of the fifth lens L5, L5 R2 represents the image-side surface of the fifth lens L5, L6 R1 represents the object-side surface of the sixth lens L6, L6 R2 represents the image-side surface of the sixth lens L6, L7 R1 represents the object-side surface of the seventh lens L7, L7 R2 represents the image-side surface of the seventh lens L7, L8 R1 represents the object-side surface of the eighth lens L8, L8 R2 represents the image-side surface of the eighth lens L8, IR R1 represents the object-side surface of the filter IR, and IR R2 represents the image-side surface of the filter IR.

[0052] In Embodiment 1, the object side surface and the image side surface of any lens from the first lens L1 to the eighth lens L8 are both even-order aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula: (1) Wherein, Z represents the height in the optical axis direction, c is the inverse of the surface radius, k is the cone coefficient, r is the diameter in the radial direction; α represents the aspheric coefficient, α1 represents the aspheric coefficient A2, α2 represents the aspheric coefficient A4... Table 2 shows the high-order coefficients A2, A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspheric mirror surface in Example 1.

[0053] Table 2:

[0054] In Example 1, according to the focal power distribution of the first lens to the eighth lens in the above table, the focal power, spacing and refractive index of each lens are reasonably allocated and set, the effect of large target surface, large aperture and short total optical length of the mobile phone lens can be achieved, wherein the field angle of the mobile phone lens is 88°, the aperture value of the mobile phone lens is 1.755, and the total optical length is 12.3mm, while the total optical length of the existing large target surface mobile phone is between tens of millimeters and hundreds of millimeters, so the mobile phone lens of this embodiment realizes the miniaturization of the lens. In addition, the focal length f of the mobile phone lens of this embodiment is 8.72mm, the working band of the mobile phone lens is 470~650nm, and the imaging circle diameter of the mobile phone lens is 16.3mm. The relationship between the focal length f6 of the sixth lens L6 and the focal length f of the mobile phone lens is: f6 / f=0.963; the relationship between the focal length f1 of the first lens L1 and the focal length f of the mobile phone lens is: f1 / f=1.375, the relationship between the sagittal height S15 of the image side surface of the seventh lens L7 and the sagittal height S16 of the object side surface of the seventh lens L7 is: S15-S16=-0.172mm; the relationship between the diameter D4 of the object side surface of the first lens L1 and the diameter D5 of the image side surface of the second lens L2 is: D4-D5=-0.003mm; the relationship between the refractive index N1 of the first lens L1 and the refractive index N8 of the eighth lens L8 is: N1-N8=0.000; the relationship between the sagittal height S15 of the image side surface of the seventh lens L7 and the sagittal height S17 of the image side surface of the eighth lens L8 is: S15-S17=0.856 mm.

[0055] Figure 3 The light fan diagram of the mobile phone lens of Example 1 is shown. The light fan diagram usually shows the cross-section of the light beam at different positions, as well as the path and changes of propagation in the optical system. It is a comprehensive evaluation diagram of various aberrations, and its scale is ±20um, that is, the scale range in the horizontal and vertical directions is ±20um, and the overall aberration of the system is very small. Figure 4 The axial aberration diagram of the mobile phone lens of Example 1 is shown, which illustrates the focus deviation formed on the focal plane by light of different wavelengths along the direction of the optical axis when the pupil radius is 2.4750 mm. The axial deviation is less than 0.05 mm, which is well corrected. Figure 5 The vertical axis chromatic aberration diagram of the mobile phone lens of Example 1 is shown, which shows that when the maximum field of view is 44.0000Deg, the focus deviation of light rays of different wavelengths formed on the imaging plane along the direction perpendicular to the optical axis is less than 7μm, and the vertical axis chromatic aberration is well corrected. Figure 6 The relative illumination and Y field of view angle diagram of the mobile phone lens of Example 1 is shown. The relative illumination is greater than 0.3 and the illumination is uniform. Figure 7The MTF curve of the mobile phone lens of Example 1 is shown, and the MTF (Modulation Transfer Function) curve shows the transmission of image details (i.e., image contrast) of the imaging system at different spatial frequencies. The MTF value is greater than 0.49 at a spatial frequency of 125lp / mm, with high resolution and good imaging effect. Figures 3 to 7 It can be seen that the mobile phone lens provided in Example 1 has well-corrected aberrations, uniform illumination and good resolution, and can achieve good imaging quality.

[0056] Example 2 The following reference Figure 8 The mobile phone lens according to Embodiment 2 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.

[0057] The mobile phone lens of Example 2 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8 from the object side to the image side. The aperture STO can be arranged on the object side of the first lens L1. The filter IR can be arranged between the eighth lens L8 and the imaging surface IMG.

[0058] The first lens L1 has positive power, and its object side surface is convex, and its image side surface is concave. The second lens L2 has negative power, and its object side surface is convex, and its image side surface is concave. The third lens L3 has positive power, and its object side surface is convex, and its image side surface is convex. The fourth lens L4 has negative power, and its object side surface is concave, and its image side surface is convex. The fifth lens L5 has negative power, and its object side surface is concave, and its image side surface is concave. The sixth lens L6 has positive power, and its object side surface is concave, and its image side surface is convex. The seventh lens L7 has negative power, and its object side surface is convex, and its image side surface is concave. The eighth lens L8 has negative power, and its object side surface is concave, and its image side surface is concave. The filter IR has an object side surface and an image side surface. Light from the object passes through the object side surfaces and image side surfaces of the first lens L1 to the eighth lens L8 and the filter IR in sequence, and is finally imaged on the imaging surface IMG.

[0059] Table 3 shows the basic parameter table of the mobile phone lens of Example 2, wherein the units of the radius of curvature, thickness, focal length, semi-aperture and sagittal height are all in millimeters (mm).

[0060] Table 3:

[0061] Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein each aspherical surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0062] Table 4:

[0063] In Example 2, according to the focal power distribution of the first lens L1 to the eighth lens L8 in the above table, the focal power, spacing and refractive index of each lens are reasonably allocated and set, the effect of large target surface, large aperture and short optical total length of the mobile phone lens can be achieved, wherein the field angle of the mobile phone lens is 88°, the aperture value of the mobile phone lens is 1.755, and the optical total length is 12mm, while the optical total length of the existing large target surface mobile phone is between tens of millimeters and hundreds of millimeters, so the mobile phone lens of this embodiment realizes the miniaturization of the lens. In addition, the focal length f of the mobile phone lens of this embodiment is 8.73mm, the working band of the mobile phone lens is 470~650nm, and the imaging circle diameter of the mobile phone lens is 16.3mm. The relationship between the focal length f6 of the sixth lens L6 and the focal length f of the mobile phone lens is: f6 / f=1.068; the relationship between the focal length f1 of the first lens L1 and the focal length f of the mobile phone lens is: f1 / f=1.297, the relationship between the sagittal height S15 of the image side surface of the seventh lens L7 and the sagittal height S16 of the object side surface of the seventh lens L7 is: S15-S16=-0.208mm; the relationship between the diameter D4 of the object side surface of the first lens L1 and the diameter D5 of the image side surface of the second lens L2 is: D4-D5=-0.004 mm; the relationship between the refractive index N1 of the first lens L1 and the refractive index N8 of the eighth lens L8 is: N1-N8=0.000; the relationship between the sagittal height S15 of the image side surface of the seventh lens L7 and the sagittal height S17 of the image side surface of the eighth lens L8 is: S15-S17=0.976 mm.

[0064] Fig. 9 The light fan diagram of the mobile phone lens of Example 2 is shown. The light fan diagram generally shows the cross-section of the light beam at different positions, as well as the path and changes of propagation in the optical system. It is a comprehensive evaluation diagram of various aberrations, and its scale is ±20um, that is, the scale range in the horizontal and vertical directions is ±20um, and the overall aberration of the system is very small. Fig.10 The axial aberration diagram of the mobile phone lens of Example 2 is shown, which illustrates the focus deviation formed on the focal plane by light of different wavelengths along the direction of the optical axis when the pupil radius is 2.4750 mm. The axial deviation is less than 0.05 mm, which is well corrected. Fig.11 The vertical axis chromatic aberration diagram of the mobile phone lens of Example 2 is shown, which shows that when the maximum field of view is 44.0000Deg, the focus deviation of light rays of different wavelengths formed on the imaging plane along the direction perpendicular to the optical axis, the vertical axis chromatic aberration is less than 6μm, and is well corrected. Fig.12 The relative illumination and Y field of view angle diagram of the mobile phone lens of Example 2 is shown. The relative illumination is greater than 0.3 and the illumination is uniform. Fig.13The MTF curve of the mobile phone lens of Example 2 is shown, and the MTF (Modulation Transfer Function) curve shows the transmission of image details (i.e., image contrast) of the imaging system at different spatial frequencies. The MTF value is greater than 0.53 at a spatial frequency of 125lp / mm, with high resolution and good imaging effect. Figures 9 to 13 It can be seen that the mobile phone lens provided in Example 2 has well-corrected aberrations, uniform illumination and good resolution, and can achieve good imaging quality.

[0065] Example 3 The following reference Fig.14 The mobile phone lens according to Embodiment 3 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.

[0066] The mobile phone lens of Example 3 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8 from the object side to the image side. The aperture STO can be arranged on the object side of the first lens L1. The filter IR can be arranged between the eighth lens L8 and the imaging surface IMG.

[0067] The first lens L1 has positive power, and its object side surface is convex, and its image side surface is concave. The second lens L2 has negative power, and its object side surface is convex, and its image side surface is concave. The third lens L3 has positive power, and its object side surface is convex, and its image side surface is convex. The fourth lens L4 has negative power, and its object side surface is concave, and its image side surface is concave. The fifth lens L5 has positive power, and its object side surface is convex, and its image side surface is concave. The sixth lens L6 has positive power, and its object side surface is concave, and its image side surface is convex. The seventh lens L7 has negative power, and its object side surface is convex, and its image side surface is concave. The eighth lens L8 has negative power, and its object side surface is concave, and its image side surface is concave. The filter IR has an object side surface and an image side surface. Light from the object passes through the object side surfaces and image side surfaces of the first lens L1 to the eighth lens L8 and the filter IR in sequence, and is finally imaged on the imaging surface IMG.

[0068] Table 5 shows the basic parameter table of the mobile phone lens of Example 3, wherein the units of the radius of curvature, thickness, focal length, semi-aperture and sagittal height are all in millimeters (mm).

[0069] Table 5:

[0070] Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein each aspherical surface shape can be defined by the formula (1) given in the above Example 1.

[0071] Table 6:

[0072] In Example 3, according to the focal power distribution of the first lens L1 to the eighth lens L8 in the above table, the focal power, spacing and refractive index of each lens are reasonably allocated and set, the effect of large target surface, large aperture and short optical total length of the mobile phone lens can be achieved, wherein the field angle of the mobile phone lens is 88°, the aperture value of the mobile phone lens is 1.76, and the optical total length is 11.46mm, while the optical total length of the existing large target surface mobile phone is between tens of millimeters and hundreds of millimeters, so the mobile phone lens of this embodiment realizes the miniaturization of the lens. In addition, the focal length f of the mobile phone lens of this embodiment is 8.74mm, the working band of the mobile phone lens is 470~650nm, and the imaging circle diameter of the mobile phone lens is 16.6mm. The relationship between the focal length f6 of the sixth lens L6 and the focal length f of the mobile phone lens is: f6 / f=1.169; the relationship between the focal length f1 of the first lens L1 and the focal length f of the mobile phone lens is: f1 / f=1.159, the relationship between the sagittal height S15 of the image side surface of the seventh lens L7 and the sagittal height S16 of the object side surface of the seventh lens L7 is: S15-S16=-0.057mm; the relationship between the diameter D4 of the object side surface of the first lens L1 and the diameter D5 of the image side surface of the second lens L2 is: D4-D5=-0.018 mm; the relationship between the refractive index N1 of the first lens L1 and the refractive index N8 of the eighth lens L8 is: N1-N8=0.000; the relationship between the sagittal height S15 of the image side surface of the seventh lens L7 and the sagittal height S17 of the image side surface of the eighth lens L8 is: S15-S17=0.834 mm.

[0073] Fig.15 The light fan diagram of the mobile phone lens of Example 3 is shown. The light fan diagram usually shows the cross-section of the light beam at different positions, as well as the path and changes of propagation in the optical system. It is a comprehensive evaluation diagram of various aberrations, and its scale is ±20um, that is, the scale range in the horizontal and vertical directions is ±20um, and the overall aberration of the system is very small. Fig.16 The axial aberration diagram of the mobile phone lens of Example 3 is shown, which illustrates the focus deviation formed on the focal plane by light of different wavelengths along the direction of the optical axis when the pupil radius is 2.4750 mm. The axial deviation is less than 0.04 mm, which is well corrected. Fig.17 The vertical axis chromatic aberration diagram of the mobile phone lens of Example 3 is shown, which illustrates that when the maximum field of view is 44.0000Deg, the focus deviation of light rays of different wavelengths formed on the imaging plane along the direction perpendicular to the optical axis, the vertical axis chromatic aberration is less than 4μm, and is well corrected. Fig.18 The relative illumination and Y field of view angle diagram of the mobile phone lens of Example 3 is shown. The relative illumination is greater than 0.3 and the illumination is uniform. Fig.19The MTF curve of the mobile phone lens of Example 3 is shown, and the MTF (Modulation Transfer Function) curve shows the transmission of image details (i.e., image contrast) of the imaging system at different spatial frequencies. The MTF value is greater than 0.5 at a spatial frequency of 125lp / mm, with high resolution and good imaging effect. Figures 15 to 19 It can be seen that the mobile phone lens provided in Example 3 has well-corrected aberrations, uniform illumination and good resolution, and can achieve good imaging quality.

[0074] Example 4 The following reference Fig. 20 The mobile phone lens according to Embodiment 4 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.

[0075] The mobile phone lens of Example 4 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8 from the object side to the image side. The aperture STO can be arranged on the object side of the first lens L1. The filter IR can be arranged between the eighth lens L8 and the imaging surface IMG.

[0076] The first lens L1 has positive power, and its object side surface is convex, and its image side surface is concave. The second lens L2 has negative power, and its object side surface is convex, and its image side surface is concave. The third lens L3 has positive power, and its object side surface is convex, and its image side surface is concave. The fourth lens L4 has negative power, and its object side surface is concave, and its image side surface is concave. The fifth lens L5 has positive power, and its object side surface is convex, and its image side surface is concave. The sixth lens L6 has positive power, and its object side surface is concave, and its image side surface is convex. The seventh lens L7 has negative power, and its object side surface is convex, and its image side surface is concave. The eighth lens L8 has negative power, and its object side surface is concave, and its image side surface is concave. The filter IR has an object side surface and an image side surface. Light from the object passes through the object side surfaces and image side surfaces of the first lens L1 to the eighth lens L8 and the filter IR in sequence, and is finally imaged on the imaging surface IMG.

[0077] Table 7 shows the basic parameter table of the mobile phone lens of Example 4, wherein the units of the radius of curvature, thickness, focal length, semi-aperture and sagittal height are all in millimeters (mm).

[0078] Table 7:

[0079] Table 8 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein each aspherical surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0080] Table 8:

[0081] In Example 4, according to the focal power distribution of the first lens L1 to the eighth lens L8 in the above table, the focal power, spacing and refractive index of each lens are reasonably allocated and set, the effect of large target surface, large aperture and short optical total length of the mobile phone lens can be achieved, wherein the field angle of the mobile phone lens is 88°, the aperture value of the mobile phone lens is 1.76, and the optical total length is 11.6mm, while the optical total length of the existing large target surface mobile phone is between tens of millimeters and hundreds of millimeters, so the mobile phone lens of this embodiment realizes the miniaturization of the lens. In addition, the focal length f of the mobile phone lens of this embodiment is 8.7mm, the working band of the mobile phone lens is 470~650nm, and the imaging circle diameter of the mobile phone lens is 16.6mm. The relationship between the focal length f6 of the sixth lens L6 and the focal length f of the mobile phone lens is: f6 / f=1.102; the relationship between the focal length f1 of the first lens L1 and the focal length f of the mobile phone lens is: f1 / f=1.209, the relationship between the sagittal height S15 of the image side surface of the seventh lens L7 and the sagittal height S16 of the object side surface of the seventh lens L7 is: S15-S16=-0.084mm; the relationship between the diameter D4 of the object side surface of the first lens L1 and the diameter D5 of the image side surface of the second lens L2 is: D4-D5=-0.014 mm; the relationship between the refractive index N1 of the first lens L1 and the refractive index N8 of the eighth lens L8 is: N1-N8=0.000; the relationship between the sagittal height S15 of the image side surface of the seventh lens L7 and the sagittal height S17 of the image side surface of the eighth lens L8 is: S15-S17=0.941 mm.

[0082] Fig.21 The light fan diagram of the mobile phone lens of Example 4 is shown. The light fan diagram generally shows the cross-section of the light beam at different positions, as well as the path and changes of propagation in the optical system. It is a comprehensive evaluation diagram of various aberrations, and its scale is ±20um, that is, the scale range in the horizontal and vertical directions is ±20um, and the overall aberration of the system is very small. Fig. 22 The axial aberration diagram of the mobile phone lens of Example 4 is shown, which illustrates the focus deviation formed on the focal plane by light of different wavelengths along the direction of the optical axis when the pupil radius is 2.4750 mm. The axial deviation is less than 0.02 mm, which is well corrected. Fig.23 The vertical axis chromatic aberration diagram of the mobile phone lens of Example 4 is shown, which shows that when the maximum field of view is 44.0000Deg, the focus deviation of light rays of different wavelengths formed on the imaging plane along the direction perpendicular to the optical axis is less than 5μm, and the vertical axis chromatic aberration is well corrected. Fig.24 The relative illumination and Y field of view angle diagram of the mobile phone lens of Example 4 is shown. The relative illumination is greater than 0.3 and the illumination is uniform. Fig.25The MTF curve of the mobile phone lens of Example 4 is shown, and the MTF (Modulation Transfer Function) curve shows the transmission of image details (i.e., image contrast) of the imaging system at different spatial frequencies. The MTF value is greater than 0.5 at a spatial frequency of 125lp / mm, with high resolution and good imaging effect. Figure 21 to Figure 25 It can be seen that the mobile phone lens provided in Example 4 has well-corrected aberrations, uniform illumination and good resolution, and can achieve good imaging quality.

[0083] In summary, Example 1, Example 2, Example 3 and Example 4 respectively satisfy the relationship shown in Table 9.

[0084] Table 9:

[0085] 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. A mobile phone lens, characterized in that: The invention comprises, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; The first lens, the third lens and the sixth lens have positive optical power, and the second lens, the fourth lens, the seventh lens and the eighth lens have negative optical power; wherein the focal length f6 of the sixth lens and the focal length f of the mobile phone lens satisfy: 0.5≤f6 / f≤1.

5.

2. The mobile phone lens according to claim 1, characterized in that: The focal length f1 of the first lens and the focal length f of the mobile phone lens satisfy: 1≤f1 / f≤1.

5.

3. The mobile phone lens according to claim 1, characterized in that: The object side surface of the second lens is convex, the image side surface of the second lens is concave, and the object side surface curvature radius L2R1 of the second lens satisfies 5 mm <L2R1<15mm。 4. The mobile phone lens according to claim 1, characterized in that: A diameter D4 of the object-side surface of the first lens and a diameter D5 of the image-side surface of the second lens satisfy: -0.2 mm ≤ D4 - D5 ≤ 0.2 mm.

5. The mobile phone lens according to claim 1, characterized in that: The object side surface of the sixth lens is concave, the image side surface of the sixth lens is convex, and the object side surface curvature radius L6R1 of the sixth lens satisfies -50 mm. <L6R1<-10mm。 6. The mobile phone lens according to claim 1, characterized in that: The object side surface of the seventh lens is convex at the paraxial position, the image side surface of the seventh lens is concave at the paraxial position, and at least one of the object side surface and the image side surface of the seventh lens has at least one inflection point.

7. The mobile phone lens according to claim 1, characterized in that: The sag S15 of the image-side surface of the seventh lens and the sag S16 of the object-side surface of the seventh lens satisfy: -0.5mm≤S15-S16≤0.5mm.

8. The mobile phone lens according to claim 1, characterized in that: The object side surface of the eighth lens is concave at the paraxial position, the image side surface of the eighth lens is concave at the paraxial position, and at least one of the object side surface and the image side surface of the eighth lens has at least one inflection point.

9. The mobile phone lens according to claim 1, characterized in that: A refractive index N1 of the first lens and a refractive index N8 of the eighth lens satisfy: -0.25≤N1-N8≤0.

25.

10. The mobile phone lens according to claim 1, characterized in that: The sag height S15 of the image side surface of the seventh lens and the sag height S17 of the image side surface of the eighth lens satisfy: 0.5mm≤S15-S17≤1mm.

Images