WO2021134765A1 - 成像透镜组、取像模组及电子装置 - Google Patents

成像透镜组、取像模组及电子装置 Download PDF

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Publication number
WO2021134765A1
WO2021134765A1 PCT/CN2020/070152 CN2020070152W WO2021134765A1 WO 2021134765 A1 WO2021134765 A1 WO 2021134765A1 CN 2020070152 W CN2020070152 W CN 2020070152W WO 2021134765 A1 WO2021134765 A1 WO 2021134765A1
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Prior art keywords
lens
lens group
imaging
imaging lens
object side
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PCT/CN2020/070152
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English (en)
French (fr)
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文逸春
张东赫
朴成在
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南昌欧菲光电技术有限公司
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Priority to PCT/CN2020/070152 priority Critical patent/WO2021134765A1/zh
Publication of WO2021134765A1 publication Critical patent/WO2021134765A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below

Definitions

  • This application relates to the field of optical imaging technology, and in particular to an imaging lens group, an image capturing module, and an electronic device.
  • an imaging lens group is provided.
  • An imaging lens group which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in order from the object side to the image side along the optical axis, wherein the first lens The lens has positive refractive power, and the paraxial area of the object side is convex; the second lens has negative refractive power; the third lens has negative refractive power, and the paraxial area of the object side is convex, and the image side is paraxial The area of the fourth lens is concave; the fourth lens has positive refractive power, and the paraxial area of the object side is convex, and the paraxial area of the image side is concave; the fifth lens has positive refractive power, and the paraxial area of the object side is Concave surface; the sixth lens has refractive power, and at least one of the object side surface and the image side surface includes at least one inflection point; the imaging lens group satisfies the following relationship:
  • f is the effective focal length of the imaging lens group
  • f1 is the effective focal length of the first lens
  • R1 is the radius of curvature of the object side of the first lens
  • R2 is the radius of curvature of the image side of the first lens
  • V1 is the Abbe number of the first lens
  • V2 is the Abbe number of the second lens
  • V3 is the Abbe number of the third lens
  • V4 is the Abbe number of the fourth lens.
  • An image capturing module includes the imaging lens group described in the above embodiment; and a photosensitive element, the photosensitive element being arranged on the image side of the imaging lens group.
  • An electronic device includes a housing and the imaging module described in the above embodiments, and the imaging module is installed on the housing.
  • FIG. 1 shows a schematic diagram of the structure of the imaging lens group of Embodiment 1 of the present application
  • 2A to 2C are respectively a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, and a distortion curve diagram of the imaging lens group of Embodiment 1;
  • FIG. 2D shows a light path diagram of the reference wavelength light passing through the imaging lens group in Embodiment 1;
  • FIG. 3 shows a schematic diagram of the structure of the imaging lens group of Embodiment 2 of the present application
  • 4A to 4C are respectively a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, and a distortion curve diagram of the imaging lens group of Embodiment 2;
  • FIG. 4D shows a light path diagram of the reference wavelength light passing through the imaging lens group in Embodiment 2;
  • FIG. 5 shows a schematic structural diagram of an imaging lens group of Embodiment 3 of the present application.
  • 6A to 6C are respectively a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, and a distortion curve diagram of the imaging lens group of Embodiment 3;
  • FIG. 6D shows an optical path diagram of light of a reference wavelength in Embodiment 3 passing through the imaging lens group.
  • first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any restriction on the feature. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as a second lens or a third lens.
  • the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspheric surface is not limited to the shape of the spherical surface or the aspheric surface shown in the drawings.
  • the drawings are only examples and are not drawn strictly to scale.
  • Camera lenses on traditional electronic equipment usually need to meet the characteristics of wide-angle and high-resolution, but it is difficult to achieve the above performance with only 4 to 5 lenses, but if more than 5 lenses are used for framing and aberrations Correction, it is difficult to make the total length of the lens group small, which makes it difficult to adapt it to slim electronic devices.
  • An embodiment of the present application provides an imaging lens assembly that not only meets the application requirements of miniaturization and light weight, but also has a large aperture and high pixel imaging capability.
  • the imaging lens group includes six lenses with refractive power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and an imaging surface on the image side of the sixth lens.
  • the six lenses are arranged in order from the object side to the image side along the optical axis.
  • the first lens has a positive refractive power and assumes the role of mainly converging light, and the paraxial area of the object side of the first lens is convex, which is beneficial to adjust the shape and refractive power of the first lens to correct the field curvature of the imaging lens group , And then improve the image quality.
  • the second lens has a negative refractive power, which is beneficial for correcting the chromatic aberration of the imaging lens group, and avoiding the overlapping of images caused by the different convergence positions of light of different wavelengths, thereby improving the imaging quality.
  • the third lens has a negative refractive power, the paraxial area of the object side is convex, and the paraxial area of the image side is concave, which is beneficial to correct aberrations caused by the second lens, thereby ensuring image quality.
  • the fourth lens has a positive refractive power, the paraxial area of the object side is convex, and the paraxial area of the image side is concave, which is beneficial to balance the refractive power distribution of the imaging lens group together with the fifth lens to correct aberrations and improve imaging quality .
  • the fifth lens has a positive refractive power, and the paraxial area of the object side is concave, which is beneficial to balance the refractive power distribution of the imaging lens group and reduce the sensitivity of the imaging lens group.
  • the sixth lens has refractive power, and at least one of the object side surface and the image side surface has at least one inflection point, which is beneficial to correct off-axis aberrations, and can also effectively suppress the off-axis field of view light from being incident on the photosensitive element
  • the angle makes it more accurately match the photosensitive element, thereby improving the light energy receiving efficiency of the photosensitive element and improving the resolution of the picture.
  • the imaging lens group satisfies the following relationship:
  • can be 0.5, 0.6, 0.7, 0.8, 0.81, 0.83, 0.85, 0.87, 0.89, 0.91, 0.95, or 0.98.
  • ⁇ 1 the effective focal length of the first lens will be too long, which is not conducive to the refractive power distribution of the imaging lens group, thereby affecting the imaging quality.
  • the imaging lens group satisfies the following relationship:
  • can be 0.2, 0.25, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.4, 0.5, 0.6, 0.7 or 0.8.
  • the first lens can have sufficient positive refractive power so that the light emitted by the object can enter the imaging lens group to ensure complete imaging; in addition, it is also beneficial to set the first lens to A meniscus lens that protrudes toward the object side makes it easier to correct distortion.
  • ⁇ 1 the refractive power of the first lens will be small, which will affect the integrity of the imaging, and will also cause difficulties in distortion correction.
  • the imaging lens group satisfies the following relationship: Among them, V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, V3 is the Abbe number of the third lens, and V4 is the Abbe number of the fourth lens. It can be 0, 0.25, 0.5, 0.75, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, or 3.0. Under the condition that the above relationship is satisfied, by selecting suitable materials of the first lens to the fourth lens, it is beneficial to achieve a balance between obtaining better imaging quality and shortening the total length of the imaging lens group, thereby better satisfying The miniaturization of the imaging lens group and the demand for a large aperture. And when At this time, it will affect the imaging quality of the imaging lens group. when At this time, it is not conducive to miniaturization of the imaging lens group.
  • an aperture stop is further provided in the imaging lens group, and the aperture stop may be provided between the object side of the imaging lens group and the first lens, or between the first lens and the sixth lens.
  • the aperture stop is located between the object side of the imaging lens group and the first lens to effectively suppress the excessive increase in the incident angle of the chief ray, so that the imaging lens group can better match the photosensitive element of the traditional specification; The stray light is blocked to prevent the stray light from affecting the imaging.
  • the aperture stop can also be located on the surface of any one of the first lens to the sixth lens (for example, the object side and the image side), and form an functional relationship with the lens, for example, by coating the surface of the lens. Cover the light-blocking coating to form an aperture stop on the surface; or fix the surface of the lens by a clamp.
  • the clamp structure on the surface can limit the width of the imaging beam of the object point on the axis, so as to be on the surface An aperture stop is formed.
  • the imaging lens group satisfies the following relationship: 1 ⁇ (TL) 2 /(ImgH*EPD) ⁇ 2; where TL is the object side surface of the first lens to the imaging surface of the imaging lens group on the optical axis
  • TL is the object side surface of the first lens to the imaging surface of the imaging lens group on the optical axis
  • ImgH is the diagonal length of the effective pixel area on the imaging surface of the imaging lens group
  • EPD is the entrance pupil diameter of the imaging lens group.
  • (TL) 2 /(ImgH*EPD) can be 1.11, 1.21, 1.38, 1.41, 1.51, 1.61, 1.71, 1.81, or 1.91.
  • the imaging lens group Under the condition that the above relationship is satisfied, it is beneficial to make the imaging lens group have a sufficient entrance pupil diameter to increase the amount of light entering, thereby increasing the brightness of the picture; in addition, it is also beneficial to shorten the total length of the imaging lens group. It has a wider application prospect, for example, it can be adapted to thin and light electronic devices to meet the user's demand for high-quality shooting of electronic devices.
  • (TL) 2 /(ImgH*EPD) is less than or equal to 1, it is easy to cause the aperture of the imaging lens group to be small, making the picture dark; and when (TL) 2 /(ImgH*EPD) is greater than or equal to 2, it will Increasing the total length of the imaging lens group is not conducive to miniaturization.
  • the imaging lens group satisfies the following relationship: 2 ⁇ TL/EPD ⁇ 3; where TL is the distance from the object side of the first lens to the imaging surface of the imaging lens group on the optical axis, and EPD is the imaging The entrance pupil diameter of the lens group.
  • TL/EPD can be 2.1, 2.2, 2.26, 2.36, 2.46, 2.56, 2.66, 2.76, 2.86, or 2.96.
  • the imaging lens group can be made to have a larger clear aperture, which can enhance the brightness of the picture and improve the imaging quality; in addition, it can also effectively shorten the total length of the imaging lens group to meet the small size of the lens. ⁇ demand.
  • TL/EPD When TL/EPD is less than or equal to 2, it is easy to cause the clear aperture of the imaging lens group to become smaller and the screen brightness decreases; when TL/EPD is greater than or equal to 3, the total length of the imaging lens group is increased, which is not conducive to miniaturization.
  • the imaging lens group satisfies the following relationship: -0.3 ⁇ f/f3 ⁇ -0.01; where f is the effective focal length of the imaging lens group, and f3 is the effective focal length of the third lens.
  • f/f3 can be -0.02, -0.04, -0.06, -0.08, -0.12, -0.16, -0.2, -0.24, or -0.28.
  • the imaging lens group satisfies the following relationship: 0.4 ⁇ f/ImgH ⁇ 0.8; where f is the effective focal length of the imaging lens group, and ImgH is the diagonal of the effective pixel area on the imaging surface of the imaging lens group length.
  • f/ImgH can be 0.45, 0.5, 0.52, 0.54, 0.56, 0.58, 0.61, 0.64, 0.67, 0.7, 0.74, or 0.78.
  • f/ImgH When f/ImgH is less than or equal to 0.4, it is easy to cause the image height to increase, which is not conducive to matching with the photosensitive element, which makes the resolution decrease; when f/ImgH is greater than or equal to 0.8, it is easy to cause the effective focal length of the imaging lens group to be too long , which is not conducive to miniaturization.
  • the imaging lens group satisfies the following relationship: 0.5 ⁇ f/TL ⁇ 1.5; where f is the effective focal length of the imaging lens group, and TL is the distance between the object side of the first lens and the imaging surface of the imaging lens group.
  • the distance on the optical axis. f/TL can be 0.6, 0.7, 0.8, 0.83, 0.86, 0.87, 0.9, 1.0, 1.1, 1.2, 1.3, or 1.4.
  • the imaging lens group can be made to have a longer effective focal length, thereby helping to increase its magnification and making it have telephoto characteristics; at the same time, it can effectively shorten the total length of the imaging lens group and ensure its small size. ⁇ .
  • f/TL When f/TL is less than or equal to 0.5, it is easy to make the total length of the imaging lens group longer, which is not conducive to miniaturization; when f/TL is greater than or equal to 1.5, the effective focal length of the effective lens group is too long, which is not conducive to image control. Jitter, which in turn affects the image quality.
  • the imaging lens group satisfies the following relationship: 0.5 ⁇ f/f5 ⁇ 2; where f is the effective focal length of the imaging lens group, and f5 is the effective focal length of the fifth lens.
  • f/f5 can be 0.65, 0.75, 0.85, 0.95, 1.0, 1.05, 1.15, 1.35, 1.55, 1.75, or 1.95.
  • f/f5 When f/f5 is less than or equal to 0.5, it is easy to make the effective focal length of the fifth lens too long, which is not conducive to balancing the refractive power of the imaging lens group, and also not conducive to aberration correction; and when f/f5 is greater than or equal to 2, It will make the effective focal length of the imaging lens group too long, which is not conducive to miniaturization.
  • the lens surface of each lens is aspherical, thereby improving the flexibility of lens design, effectively correcting aberrations, and improving the imaging resolution of the imaging lens group .
  • the object side surface and the image side surface of each lens of the imaging lens group may also be spherical surfaces. It should be noted that the above-mentioned embodiments are only examples of some embodiments of the present application.
  • the surface of each lens in the imaging lens group may be an aspheric surface or any combination of spherical surfaces.
  • the material of each lens in the imaging lens group may be glass or plastic.
  • the plastic lens can reduce the weight of the imaging lens group and reduce the production cost.
  • the lens material in the electronic device is Plastic; and the glass lens can make the imaging lens group have excellent optical performance and higher temperature resistance characteristics, preferably, the lens material in the vehicle lens is glass.
  • the material of each lens in the imaging lens group can also be any combination of glass and plastic, and not necessarily all glass or plastic.
  • the imaging lens group further includes a filter for filtering infrared light and/or a protective glass for protecting the photosensitive element, wherein the filter and/or the protective glass are provided on the sixth lens and the imaging lens.
  • the photosensitive element is located on the imaging surface of the imaging lens group. Further, the imaging surface may be the photosensitive surface of the photosensitive element.
  • the imaging lens group of the above-mentioned embodiment of the present application may use multiple lenses, for example, the above-mentioned six lenses.
  • the imaging lens group is not limited to including six lenses. If necessary, the imaging lens group may also include other numbers of lenses.
  • 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 the lens surface At least the paraxial area is concave.
  • the paraxial area here refers to the area near the optical axis. The surface of each lens closest to the object is called the object side, and the surface of each lens closest to the imaging surface is called the image side.
  • FIG. 1 shows a schematic diagram of the structure of the imaging lens group of Embodiment 1.
  • the imaging lens group includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens in order from the object side to the image side along the optical axis. L6 and imaging surface S15.
  • the first lens L1 has a positive refractive power
  • the object side surface S1 is a convex surface
  • the image side surface S2 is a concave surface.
  • the second lens L2 has a negative refractive power
  • the object side surface S3 is a convex surface
  • the image side surface S4 is a concave surface.
  • the third lens L3 has a negative refractive power
  • the object side surface S5 is a convex surface
  • the image side surface S6 is a concave surface.
  • the fourth lens L4 has a positive refractive power, the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens L5 has a positive refractive power
  • the object side surface S9 is a concave surface
  • the image side surface S10 is a convex surface.
  • the sixth lens L6 has a negative refractive power, the object side surface S11 is a concave surface, and the image side surface S12 is a concave surface.
  • each lens of the first lens L1 to the sixth lens L6 are aspherical.
  • the design of the aspherical surface can solve the problem of distortion of the field of view, and can also make the lens smaller, thinner and flat. Achieve excellent optical imaging effect, and further make the imaging lens group have the characteristics of miniaturization.
  • the materials of the first lens L1 to the sixth lens L6 are all plastic, and the plastic lens can reduce the weight of the imaging lens group and at the same time reduce the production cost.
  • a stop STO is also provided between the object OBJ and the first lens L1 to further improve the imaging quality of the imaging lens group.
  • the imaging lens group further includes a filter L7 having an object side surface S13 and an image side surface S14.
  • the light from the object OBJ sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
  • the filter L7 is an infrared filter, which is used to filter the infrared light from the external light incident to the imaging lens group to avoid imaging distortion.
  • the material of the infrared filter L7 is glass.
  • the infrared filter L7 can be part of the imaging lens group and assembled with each lens, or can also be installed when the imaging lens group and the photosensitive element are assembled.
  • Table 1 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (ie, dispersion coefficient), and effective focal length of each lens of the imaging lens group of Example 1, where the radius of curvature and thickness The unit of effective focal length of each lens is millimeter (mm).
  • the first value in the "thickness" parameter column of the first lens L1 is the thickness of the lens on the optical axis
  • the second value is the direction from the image side to the image side of the lens. The distance from the object side of the latter lens to the optical axis.
  • the reference wavelength in Table 1 is 540nm.
  • the aspheric surface type in each lens is defined by the following formula:
  • x is the distance vector height of the aspheric surface from the apex of the aspheric surface when the height is h along the optical axis direction;
  • k is the conic coefficient;
  • Ai is the i-th order coefficient of the aspheric surface.
  • Table 2 below shows the higher order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the lens aspheric surfaces S1-S12 in Example 1.
  • the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the imaging lens group of this embodiment is 8.0 mm. Therefore, in combination with the data in Table 1 and Table 2, it can be known that the imaging lens group in Embodiment 1 satisfies:
  • R1 is the radius of curvature of the object side S1 of the first lens L1
  • R2 is the radius of curvature of the image side S2 of the first lens L1
  • V1 is the Abbe number of the first lens L1
  • V2 is the Abbe number of the second lens L2
  • V3 is the Abbe number of the third lens L3
  • V4 is the Abbe number of the fourth lens L4;
  • TL is the distance from the object side S1 of the first lens L1 to the imaging surface S15 of the imaging lens group on the optical axis
  • ImgH is the effective pixel on the imaging surface S15 of the imaging lens group
  • EPD is the entrance pupil diameter of the imaging lens group
  • TL/EPD 2.36
  • TL is the distance from the object side S1 of the first lens L1 to the imaging surface S15 of the imaging lens group on the optical axis
  • EPD is the entrance pupil diameter of the imaging lens group.
  • f/f3 -0.08
  • f is the effective focal length of the imaging lens group
  • f3 is the effective focal length of the third lens L3;
  • f/ImgH 0.56
  • f is the effective focal length of the imaging lens group
  • ImgH is the diagonal length of the effective pixel area on the imaging surface of the imaging lens group
  • f/TL 0.87
  • f is the effective focal length of the imaging lens group
  • TL is the distance from the object side surface S1 of the first lens L1 to the imaging surface S15 of the imaging lens group on the optical axis
  • f/f5 1.15
  • f is the effective focal length of the imaging lens group
  • f5 is the effective focal length of the fifth lens L5.
  • FIG. 2A shows the longitudinal spherical aberration curve of the imaging lens group of Example 1, which respectively indicate the deviation of the focal point of light with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm after passing through the imaging lens group;
  • FIG. 2B shows the implementation The astigmatism curve of the imaging lens group of Example 1, which represents meridional curvature of field and sagittal field curvature;
  • FIG. 2C shows the distortion curve of the imaging lens group of Example 1, which represents the distortion rate under different image heights.
  • 2D shows the light path diagram of the reference wavelength light passing through the imaging lens group in Example 1. According to FIGS. 2A to 2D, it can be seen that the imaging lens group given in Embodiment 1 can achieve good imaging quality.
  • FIG. 3 shows a schematic structural diagram of an imaging lens group according to Embodiment 2 of the present application.
  • the imaging lens group includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens in order from the object side to the image side along the optical axis.
  • the first lens L1 has a positive refractive power
  • the object side surface S1 is a convex surface
  • the image side surface S2 is a concave surface.
  • the second lens L2 has a negative refractive power, the object side S3 is convex, and the image side S4 is concave.
  • the third lens L3 has a negative refractive power
  • the object side surface S5 is a convex surface
  • the image side surface S6 is a concave surface.
  • the fourth lens L4 has a positive refractive power, the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens L5 has a positive refractive power
  • the object side surface S9 is a concave surface
  • the image side surface S10 is a convex surface.
  • the sixth lens L6 has a positive refractive power, the object side surface S11 is a concave surface, and the image side surface S12 is a concave surface.
  • each lens of the first lens L1 to the sixth lens L6 are aspherical.
  • the design of the aspherical surface can solve the problem of distortion of the field of view, and can also make the lens smaller, thinner and flat. Achieve excellent optical imaging effect, and further make the imaging lens group have the characteristics of miniaturization.
  • the materials of the first lens L1 to the sixth lens L6 are all plastic, and the plastic lens can reduce the weight of the imaging lens group and at the same time reduce the production cost.
  • a stop STO is also provided between the object OBJ and the first lens L1 to further improve the imaging quality of the imaging lens group.
  • the imaging lens group further includes a filter L7 having an object side surface S13 and an image side surface S14.
  • the light from the object OBJ sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
  • the filter L7 is an infrared filter, which is used to filter the infrared light in the external light incident to the imaging lens group to avoid imaging distortion.
  • Table 3 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (ie dispersion coefficient), and effective focal length of each lens of the imaging lens group of Example 2, where the radius of curvature and thickness
  • the unit of effective focal length of each lens is millimeter (mm)
  • Table 4 shows the coefficients of higher order terms that can be used for the aspheric surface S1-S12 of the lens in Example 2, where the aspheric surface type can be given in Example 1.
  • the formula (1) is defined
  • Table 5 shows the relevant parameter values of the imaging lens group given in Example 2.
  • the reference wavelength is 540nm.
  • FIGS. 4A to 4D shows the longitudinal spherical aberration curve of the imaging lens group of Embodiment 2, which respectively indicate the deviation of the focal point of light rays of different wavelengths after passing through the imaging lens group;
  • FIG. 4B shows the astigmatism of the imaging lens group of Embodiment 2
  • Fig. 4C shows the distortion curve of the imaging lens group of Example 2, which represents the distortion rate under different image heights;
  • Fig. 4D shows Example 2 The light path diagram of the middle reference wavelength light passing the imaging lens group. According to FIGS. 4A to 4D, it can be seen that the imaging lens group given in Embodiment 2 can achieve good imaging quality.
  • FIG. 5 shows a schematic diagram of the structure of the imaging lens group of Embodiment 3 of the present application.
  • the imaging lens group includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens in order from the object side to the image side along the optical axis.
  • L6 and imaging surface S15 are shown in FIG. 5, the imaging lens group includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens in order from the object side to the image side along the optical axis.
  • L6 and imaging surface S15 L6 and imaging surface S15.
  • the first lens L1 has a positive refractive power
  • the object side surface S1 is a convex surface
  • the image side surface S2 is a concave surface.
  • the second lens L2 has a negative refractive power, the object side S3 is convex, and the image side S4 is concave.
  • the third lens L3 has a negative refractive power
  • the object side surface S5 is a convex surface
  • the image side surface S6 is a concave surface.
  • the fourth lens L4 has a positive refractive power, the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens L5 has a positive refractive power
  • the object side surface S9 is a concave surface
  • the image side surface S10 is a convex surface.
  • the sixth lens L6 has a positive refractive power, the object side surface S11 is a concave surface, and the image side surface S12 is a concave surface.
  • each lens of the first lens L1 to the sixth lens L6 are aspherical.
  • the design of the aspherical surface can solve the problem of distortion of the field of view, and can also make the lens smaller, thinner and flat. Achieve excellent optical imaging effect, and further make the imaging lens group have the characteristics of miniaturization.
  • the materials of the first lens L1 to the sixth lens L6 are all plastic, and the plastic lens can reduce the weight of the imaging lens group and at the same time reduce the production cost.
  • a stop STO is also provided between the object OBJ and the first lens L1 to further improve the imaging quality of the imaging lens group.
  • the imaging lens group further includes a filter L7 having an object side surface S13 and an image side surface S14.
  • the light from the object OBJ sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
  • the filter L7 is an infrared filter, which is used to filter the infrared light in the external light incident to the imaging lens group to avoid imaging distortion.
  • Table 6 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (ie dispersion coefficient), and effective focal length of each lens of the imaging lens group of Example 3, where the radius of curvature and thickness , The unit of the effective focal length of each lens is millimeter (mm);
  • Table 7 shows the higher order term coefficients that can be used for the aspheric surface S1-S12 of the lens in Example 3, where the aspheric surface type can be given in Example 1.
  • the formula (1) is defined;
  • Table 8 shows the relevant parameter values of the imaging lens group given in Example 3.
  • the reference wavelength is 540nm.
  • FIG. 6A shows the longitudinal spherical aberration curve of the imaging lens group of Embodiment 3, which respectively indicate the deviation of the focal point of light rays of different wavelengths after passing through the imaging lens group;
  • FIG. 6B shows the astigmatism of the imaging lens group of Embodiment 3 The curve represents the meridional field curvature and the sagittal field curvature;
  • FIG. 6C shows the distortion curve of the imaging lens group of Example 3, which represents the distortion rate under different image heights;
  • FIG. 6D shows Example 3 The light path diagram of the middle reference wavelength light passing through the imaging lens group. According to FIGS. 6A to 6D, it can be seen that the imaging lens group provided in Embodiment 3 can achieve good imaging quality.
  • the present application also provides an imaging module, including the imaging lens group as described above; and a photosensitive element, which is arranged on the image side of the imaging lens group to receive the light projected by the imaging lens group and carrying image information.
  • the photosensitive element may use a complementary metal oxide semiconductor (CMOS, Complementary Metal Oxide Semiconductor) image sensor or a charge-coupled device (CCD, Charge-coupled Device) image sensor.
  • CMOS complementary metal oxide semiconductor
  • CCD Charge-coupled Device
  • the above-mentioned imaging module can capture clear and bright images by using the aforementioned imaging lens group.
  • the imaging device also has the feature of miniaturization, which is convenient to adapt to devices with limited size such as thin and light electronic equipment.
  • the present application also provides an electronic device, including a housing and the image capturing module as described above.
  • the image capturing module is installed on the housing for capturing images.
  • the imaging module is arranged in the housing and exposed from the housing to acquire images.
  • the housing can provide protection for the imaging module from dust, water, drop, etc., and the housing is provided with corresponding imaging modules. Hole, so that the light can penetrate into or out of the shell from the hole.
  • the above-mentioned electronic device has the characteristics of light and thin structure, and can be used to capture bright and high-definition images by using the aforementioned imaging module to meet the user's multi-scene and professional shooting requirements.
  • the "electronic device” used in the embodiments of the present application may include, but is not limited to, a device configured to be connected via a wired line and/or receive or send a communication signal via a wireless interface.
  • An electronic device set to communicate through a wireless interface may be referred to as a "wireless communication terminal", a “wireless terminal” or a “mobile terminal”.
  • mobile terminals include, but are not limited to satellite or cellular phones; personal communication system (PCS) terminals that can combine cellular radio phones with data processing, fax, and data communication capabilities; can include radio phones, pagers, and the Internet/ Personal digital assistant (PDA) with intranet access, web browser, notebook, calendar, and/or global positioning system (GPS) receiver; and conventional laptop and/or palmtop Receiver or other electronic device including a radio telephone transceiver.
  • PCS personal communication system
  • PDA Internet/ Personal digital assistant
  • GPS global positioning system

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Abstract

一种成像透镜组、取像模组及电子装置。成像透镜组沿着光轴由物侧至像侧依序包括具有正屈折力的第一透镜（L1），其物侧面为凸面；具有负屈折力的第二透镜（L2）；具有负屈折力的第三透镜（L3），其物侧面近轴区域为凸面，像侧面近轴区域为凹面；具有正屈折力的第四透镜（L4），其物侧面近轴区域为凸面，像侧面近轴区域为凹面；具有正屈折力的第五透镜（L5），其物侧面近轴区域为凹面；具有屈折力的第六透镜（L6），其物侧面和像侧面中至少一个表面包含至少一个反曲点。当满足特定条件时，该成像透镜组具有明亮、清晰度高的成像效果以及小型化的结构特点。

Description

成像透镜组、取像模组及电子装置 技术领域
本申请涉及光学成像技术领域，特别是涉及一种成像透镜组、取像模组及电子装置。
背景技术
近年来，随着科学技术的发展，具有摄像功能的便携式电子产品得到人们更多的青睐，同时人们对于拍摄出高成像质量照片的需求也日益增长。而随着半导体工艺技术的进步，CMOS芯片等感光元件制造精度越来越高，其像素尺寸越来越小，再加上现今电子产品以功能佳且轻薄短小的外型为发展趋势，因此，具备良好成像品质的小型化镜头俨然成为目前市场上的主流。
传统的光学镜头为了实现较佳的光学拍摄性能，其尺寸通常较大，总长也较长，难以搭载在超薄型的电子产品上，但若通过减少镜片组成以缩短镜头总长时，往往又无法保证镜头的成像质量。
发明内容
根据本申请的各种实施例，提供一种成像透镜组。
一种成像透镜组，沿着光轴由物侧至像侧依序包括：第一透镜、第二透镜、第三透镜、第四透镜、第五透镜和第六透镜，其中，所述第一透镜具有正屈折力，且其物侧面近轴区域为凸面；所述第二透镜具有负屈折力；所述第三透镜具有负屈折力，且其物侧面近轴区域为凸面，像侧面近轴区域为凹面；所述第四透镜具有正屈折力，且其物侧面近轴区域为凸面，像侧面近轴区域为凹面；所述第五透镜具有正屈折力，且其物侧面近轴区域为凹面；所述第六透镜具有屈折力，且其物侧面和像侧面中至少一个表面包含至少一个反曲点；所述成像透镜组满足下列关系式：
|f1/f|＜1；
|R1/R2|＜1；
Figure PCTCN2020070152-appb-000001
其中，f为所述成像透镜组的有效焦距，f1为所述第一透镜的有效焦距，R1为所述第一透镜物侧面的曲率半径，R2为所述第一透镜像侧面的曲率半径，V1为所述第一透镜的阿贝数，V2为所述第二透镜的阿贝数，V3 为所述第三透镜的阿贝数，V4为所述第四透镜的阿贝数。
一种取像模组，包括上述实施例所述的成像透镜组；以及感光元件，所述感光元件设于所述成像透镜组的像侧。
一种电子装置，包括壳体以及上述实施例所述的取像模组，所述取像模组安装在所述壳体上。
本申请的一个或多个实施例的细节在下面的附图和描述中提出。本申请的其他特征、目的和优点将从说明书、附图以及权利要求书变得明显。
附图说明
为了更好地描述和说明这里公开的那些发明的实施例或示例，可以参考一幅或多幅附图。用于描述附图的附加细节或示例不应当被认为是对所公开的发明、目前描述的实施例或示例以及目前理解的这些发明的最佳模式中的任何一者的范围的限制。
图1示出了本申请实施例1的成像透镜组的结构示意图；
图2A至图2C分别为实施例1的成像透镜组的纵向球差曲线图、像散曲线图以及畸变曲线图；
图2D示出了实施例1中参考波长光线经过成像透镜组的光路图；
图3示出了本申请实施例2的成像透镜组的结构示意图；
图4A至图4C分别为实施例2的成像透镜组的纵向球差曲线图、像散曲线图以及畸变曲线图；
图4D示出了实施例2中参考波长光线经过成像透镜组的光路图；
图5示出了本申请实施例3的成像透镜组的结构示意图；
图6A至图6C分别为实施例3的成像透镜组的纵向球差曲线图、像散曲线图以及畸变曲线图；
图6D示出了实施例3中参考波长光线经过成像透镜组的光路图。
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
需要说明的是，当元件被称为“设置于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“垂直的”、“水平的”、“左”、“右”以及类似的表述只是为了说明的目的，并不表示是唯一的实施方式。
应注意，在本说明书中，第一、第二、第三等的表述仅用于将一个特征与另一个特征区分开来，而不表示对特征的任何限制。因此，在不背离 本申请的教导的情况下，下文中讨论的第一透镜也可被称作第二透镜或第三透镜。
为了便于说明，附图中所示的球面或非球面的形状通过示例的方式示出。即，球面或非球面的形状不限于附图中示出的球面或非球面的形状。附图仅为示例而并非严格按比例绘制。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请。本文所使用的术语“及/或”包括一个或多个相关的所列项目的任意的和所有的组合。
传统的电子设备上的相机镜头通常需要满足广角以及高分辨率等特性，但是仅利用4至5片透镜是较难实现上述性能的，但若利用5片以上的透镜来进行取景并进行像差校正，又很难将透镜组的总长做小，从而较难将其适配至纤薄型的电子设备。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以下将对本申请的特征、原理和其他方面进行详细描述。
请一并参阅图1、图3和图5，本申请实施例提供一种既满足小型化、轻量化的应用需求，又具备大光圈和高像素成像能力的成像透镜组。该成像透镜组包括六片具有屈折力的透镜，即第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜以及位于第六透镜像侧的成像面。该六片透镜沿着光轴从物侧至像侧依序排列。
第一透镜具有正屈折力，承担主要汇聚光线的作用，且第一透镜的物侧面近轴区域为凸面，从而有利于调整第一透镜的形状以及屈折力大小，以修正成像透镜组的场曲，进而提升成像质量。
第二透镜具有负屈折力，从而有利于修正成像透镜组的色差，避免不同波长的光线的会聚位置不同而导致影像重叠，进而提升成像质量。
第三透镜具有负屈折力，其物侧面近轴区域为凸面，像侧面近轴区域为凹面，从而有利于修正由于第二透镜引起的像差，进而保证成像质量。
第四透镜具有正屈折力，其物侧面近轴区域为凸面，像侧面近轴区域为凹面，从而有利于与第五透镜一起平衡成像透镜组的屈折力分布，以修正像差，提升成像品质。
第五透镜具有正屈折力，其物侧面近轴区域为凹面，从而有利于平衡成像透镜组的屈折力分布，降低成像透镜组的敏感度。
第六透镜具有屈折力，其物侧面和像侧面中至少一个表面具有至少一个反曲点，从而有利于修正离轴像差，同时也可以有效地压制离轴视场的光线入射至感光元件上的角度，使其更精准地匹配感光元件，从而提高感光元件的光能接收效率，提升画面的解析度。
具体的，成像透镜组满足下列关系式：|f1/f|＜1；其中，f为成像透镜组的有效焦距，f1为第一透镜的有效焦距。|f1/f|可以是0.5、0.6、0.7、0.8、0.81、0.83、0.85、0.87、0.89、0.91、0.95或0.98。在满足上述关系的条件下，有利于选择第一透镜的有效焦距，并对成像透镜组的屈折力进行合理分配及优化，进而使成像透镜组具备良好的光学性能，较好地抑制像差。而当|f1/f|≥1时，会使第一透镜的有效焦距过长，不利于成像透镜组的屈折力分配，进而对成像质量造成影响。
具体的，成像透镜组满足下列关系式：|R1/R2|＜1；其中，R1为第一透镜物侧面的曲率半径，R2为第一透镜像侧面的曲率半径。|R1/R2|可以是0.2、0.25、0.3、0.31、0.32、0.33、0.34、0.35、0.4、0.5、0.6、0.7或0.8。在满足上述关系的条件下，可使第一透镜具备足够的正屈折力从而使物体发出的光线均能进入成像透镜组，保证成像完整；除此之外，也有利于将第一透镜设置为朝物侧凸出的弯月形透镜，从而更容易进行畸变的修正。而当|R1/R2|≥1时，会使第一透镜的屈折力较小而对成像的完整性造成影响，同时也会对畸变修正造成困难。
具体的，成像透镜组满足下列关系式：
Figure PCTCN2020070152-appb-000002
其中，V1为第一透镜的阿贝数，V2为第二透镜的阿贝数，V3为第三透镜的阿贝数，V4为第四透镜的阿贝数。
Figure PCTCN2020070152-appb-000003
可以是0、0.25、0.5、0.75、1.0、1.25、1.5、1.75、2.0、2.25、2.5、2.75或3.0。在满足上述关系的条件下，通过选取合适的第一透镜至第四透镜的材料，有利于在获得较佳的成像质量以及缩短所述成像透镜组的总长之间取得平衡，从而更好地满足成像透镜组的小型化以及大光圈需求。而当
Figure PCTCN2020070152-appb-000004
Figure PCTCN2020070152-appb-000005
时，会对成像透镜组的成像质量造成影响。当
Figure PCTCN2020070152-appb-000006
时，不利于成像透镜组的小型化。
在示例性实施方式中，成像透镜组中还设置有孔径光阑，孔径光阑可以设于成像透镜组的物侧与第一透镜之间，或第一透镜与第六透镜之间。优选的，孔径光阑位于成像透镜组的物侧与第一透镜之间，以有效抑制主光线入射角过度增大，使得成像透镜组更好地与传统规格的感光元件匹配；同时还可以对杂散光进行遮挡，避免杂散光对成像造成影响。
在另一些实施例中，孔径光阑也可位于第一透镜至第六透镜中任一透镜的表面上(例如物侧面和像侧面)，与透镜形成作用关系，例如，通过在透镜的表面涂覆阻光涂层以在该表面形成孔径光阑；或通过夹持件固定夹持透镜的表面，位于该表面的夹持件结构能够限制轴上物点成像光束的宽度，从而在该表面上形成孔径光阑。
在示例性实施方式中，成像透镜组满足下列关系式：1＜(TL) 2/(ImgH*EPD)＜2；其中，TL为第一透镜的物侧面至成像透镜组的成像面在光轴上的距离，ImgH为成像透镜组的成像面上有效像素区域的对角线长度，EPD为成像透镜组的入瞳直径。(TL) 2/(ImgH*EPD)可以是1.11、1.21、1.38、1.41、1.51、1.61、1.71、1.81或1.91。在满足上关系的条件下，有利于使成像透镜组具有足够的入瞳直径以增加光线的射入量，进而可以提高画面的亮度；除此之外，还有利于缩短成像透镜组的总长以使其具备更广泛的应用前景，例如可以适配至轻薄型的电子设备，以满足用户对于电子设备的高品质拍摄需求。而当(TL) 2/(ImgH*EPD)小于等于1时，容易导致成像透镜组的光圈较小，使得画面变暗；而当(TL) 2/(ImgH*EPD)大于等于2时，会增加成像透镜组的总长，从而不利于小型化。
在示例性实施方式中，成像透镜组满足下列关系式：2＜TL/EPD＜3；其中，TL为第一透镜的物侧面至成像透镜组的成像面在光轴上的距离，EPD为成像透镜组的入瞳直径。TL/EPD可以是2.1、2.2、2.26、2.36、2.46、2.56、2.66、2.76、2.86或2.96。在满足上述关系的条件下，可以使成像透镜组具备较大的通光孔径，进而可以增强画面亮度，提升成像质量；除此之外，还能够有效缩短成像透镜组的总长，满足镜头的小型化需求。而当TL/EPD小于等于2时，容易导致成像透镜组的通光孔径变小，画面亮度降低；而当TL/EPD大于等于3时，会增加成像透镜组的总长，不利于小型化。
在示例性实施方式中，成像透镜组满足下列关系式：-0.3＜f/f3＜-0.01；其中，f为成像透镜组的有效焦距，f3为第三透镜的有效焦距。f/f3可以是-0.02、-0.04、-0.06、-0.08、-0.12、-0.16、-0.2、-0.24或-0.28。通过控制成像透镜组的有效焦距与第三透镜的有效焦距满足上述关系，有利于平衡第二透镜产生的球差，并可以有效修正成像透镜组的离轴像差，进而提升成像品质。而当f/f3小于等于-0.3时，第三透镜的有效焦距过小，屈折力过大，不利于像差修正；而当f/f3大于等于-0.01时，第三透镜屈折力过小，也不利于像差的修正。
在示例性实施方式中，成像透镜组满足下列关系式：0.4＜f/ImgH＜0.8；其中，f为成像透镜组的有效焦距，ImgH为成像透镜组的成像面上有效像素区域的对角线长度。f/ImgH可以是0.45、0.5、0.52、0.54、0.56、0.58、0.61、0.64、0.67、0.7、0.74或0.78。在满足上述关系的条件下，有利于使成像透镜组更好地与感光元件匹配，从而可以提高图像的分辨率，同时还能有效缩短成像透镜组的总长，实现镜头的小型化。而当f/ImgH小于等于0.4时，容易导致像高增大，从而不利于与感光元件匹配，使得 分辨率下降；而当f/ImgH大于等于0.8时，容易导致成像透镜组的有效焦距过长，从而不利于小型化。
在示例性实施方式中，成像透镜组满足下列关系式：0.5＜f/TL＜1.5；其中，f为成像透镜组的有效焦距，TL为第一透镜的物侧面至成像透镜组的成像面在光轴上的距离。f/TL可以是0.6、0.7、0.8、0.83、0.86、0.87、0.9、1.0、1.1、1.2、1.3或1.4。在满足上述关系的条件下，可以使成像透镜组具有较长的有效焦距，从而有助于提高其放大倍率，使其具备远摄特性；同时还能够有效缩短成像透镜组的总长，保证其小型化。而当f/TL小于等于0.5时，容易使得成像透镜组的总长较长，不利于小型化；而当f/TL大于等于1.5时，成效透镜组的有效焦距过长，则不利于控制图像的抖动，进而影响成像质量。
在示例性实施方式中，成像透镜组满足下列关系式：0.5＜f/f5＜2；其中，f为成像透镜组的有效焦距，f5为第五透镜的有效焦距。f/f5可以是0.65、0.75、0.85、0.95、1.0、1.05、1.15、1.35、1.55、1.75或1.95。通过控制成像透镜组的有效焦距与第五透镜的有效焦距满足上述关系，可以平衡成像透镜组的屈折力，有助于降低成像透镜组的敏感度；除此之外，也有利于修正成像透镜组的像差，保证成像质量。而当f/f5小于等于0.5时，容易使得第五透镜的有效焦距过长，从而不利于平衡成像透镜组的屈折力，也不利于像差的修正；而当f/f5大于等于2时，会使得成像透镜组的有效焦距过长，从而不利于小型化。
在示例性实施方式中，第一透镜至第六透镜中，各透镜的透镜表面均为非球面，从而可以提高透镜设计的灵活性，并有效地校正像差，提升成像透镜组的成像解析度。在另一些实施例中，成像透镜组的各透镜的物侧面和像侧面也可以均为球面。需要注意的是，上述实施例仅是对本申请的一些实施例的举例，在一些实施例中，成像透镜组中各透镜的表面可以是非球面或球面的任意组合。
在示例性实施方式中，成像透镜组中各透镜的材质可以均为玻璃或均为塑料，塑料材质的透镜能够减少成像透镜组的重量并降低生产成本，优选的，电子设备中的透镜材质为塑料；而玻璃材质的透镜可使成像透镜组具备优良的光学性能以及较高的耐温的特性，优选的，车载镜头中的透镜材质为玻璃。需要注意的是，成像透镜组中各透镜的材质也可以为玻璃和塑料的任意组合，并不一定要是均为玻璃或均为塑料。
在示例性实施方式中，成像透镜组还包括用于滤除红外光线的滤光片和/或用于保护感光元件的保护玻璃，其中滤光片和/或保护玻璃设于第六透镜和成像透镜组的感光元件之间，感光元件位于成像透镜组的成像面上。 进一步的，该成像面可以为感光元件的感光表面。
本申请的上述实施方式的成像透镜组可采用多片镜片，例如上文所述的六片。通过合理分配各透镜焦距、光焦度、面型、厚度以及各透镜之间的轴上间距等，可以保证上述成像透镜组的总长较小且具备较大光圈，同时还具有较高的成像质量，从而更好地满足手机、平板等轻薄型电子设备的适配需求和暗光拍摄需求。可以理解的是，虽然在实施方式中以六个透镜为例进行了描述，但是该成像透镜组不限于包括六个透镜，如果需要，该成像透镜组还可包括其它数量的透镜。
下面参照附图进一步描述可适用于上述实施方式的成像透镜组的具体实施例。在下述实施例中，若透镜表面为凸面且未界定该凸面位置时，则表示该透镜表面至少于近轴区域为凸面；若透镜表面为凹面且未界定该凹面位置时，则表示该透镜表面至少于近轴区域为凹面。此处近轴区域是指光轴附近的区域。每个透镜中最靠近物体的表面称为物侧面，每个透镜中最靠近成像面的表面称为像侧面。
实施例1
以下参照图1至图2D描述本申请实施例1的成像透镜组。
图1示出了实施例1的成像透镜组的结构示意图。如图1所示，成像透镜组沿着光轴从物侧至像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6和成像面S15。
第一透镜L1具有正屈折力，其物侧面S1为凸面，像侧面S2为凹面。
第二透镜L2具有负屈折力，其物侧面S3为凸面，像侧面S4为凹面。
第三透镜L3具有负屈折力，其物侧面S5为凸面，像侧面S6为凹面。
第四透镜L4具有正屈折力，其物侧面S7为凸面，像侧面S8为凹面。
第五透镜L5具有正屈折力，其物侧面S9为凹面，像侧面S10为凸面。
第六透镜L6具有负屈折力，其物侧面S11为凹面，像侧面S12为凹面。
第一透镜L1至第六透镜L6的各透镜的物侧面及像侧面均为非球面，非球面的设计能够解决视界歪曲的问题，也能够使透镜在较小、较薄且较平的情况下实现优良的光学成像效果，进而使成像透镜组具备小型化特性。
第一透镜L1至第六透镜L6的材质均为塑料，塑料材质的透镜能够减少成像透镜组的重量，同时还能降低生产成本。
物体OBJ与第一透镜L1之间还设置有光阑STO，以进一步提升成像透镜组的成像质量。
成像透镜组还包括具有物侧面S13和像侧面S14的滤光片L7。来自物体OBJ的光依序穿过各表面S1至S14并最终成像在成像面S15上。进一步的，滤光片L7为红外滤光片，用以滤除入射至成像透镜组的外界光线中的 红外光线，避免成像失真。具体的，红外滤光片L7的材质为玻璃。红外滤光片L7可以属于成像透镜组的一部分，与各透镜一同装配，或者也可在成像透镜组与感光元件装配时一同安装。
表1示出了实施例1的成像透镜组的各透镜的表面类型、曲率半径、厚度、材质、折射率、阿贝数(即色散系数)和各透镜的有效焦距，其中，曲率半径、厚度、各透镜的有效焦距的单位均为毫米(mm)。另外，以第一透镜L1为例，第一透镜L1的“厚度”参数列中的第一个数值为该透镜于光轴上的厚度，第二个数值为该透镜的像侧面至像侧方向的后一透镜的物侧面于光轴上的距离。表1的参考波长为540nm。
表1
Figure PCTCN2020070152-appb-000007
各透镜中的非球面面型由以下公式限定：
Figure PCTCN2020070152-appb-000008
其中，x为非球面沿光轴方向在高度为h的位置时，距非球面顶点的距离矢高；c为非球面的近轴曲率，c＝1/R(即，近轴曲率c为表1中曲率半径R的倒数)；k为圆锥系数；Ai是非球面的第i阶系数。下表2给出了可用于实施例1中透镜非球面S1-S12的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20。
表2
Figure PCTCN2020070152-appb-000009
Figure PCTCN2020070152-appb-000010
本实施例成像透镜组的成像面S15上有效像素区域的对角线长ImgH为8.0mm，因此结合表1和表2中的数据可知，实施例1中的成像透镜组满足：
|f1/f|＝0.88，其中，f为成像透镜组的有效焦距，f1为第一透镜L1的有效焦距；
|R1/R2|＝0.31，其中，R1为第一透镜L1物侧面S1的曲率半径，R2为第一透镜L1像侧面S2的曲率半径；
Figure PCTCN2020070152-appb-000011
其中，V1为第一透镜L1的阿贝数，V2为第二透镜L2的阿贝数，V3为第三透镜L3的阿贝数，V4为第四透镜L4的阿贝数；
(TL) 2/(ImgH*EPD)＝1.51，TL为第一透镜L1的物侧面S1至成像透镜组的成像面S15在光轴上的距离，ImgH为成像透镜组的成像面S15上有效像素区域的对角线距离，EPD为成像透镜组的入瞳直径；
TL/EPD＝2.36，TL为第一透镜L1的物侧面S1至成像透镜组的成像面S15在光轴上的距离，EPD为成像透镜组的入瞳直径。
f/f3＝-0.08，f为成像透镜组的有效焦距，f3为第三透镜L3的有效焦距；
f/ImgH＝0.56，f为成像透镜组的有效焦距，ImgH为成像透镜组的成像面上有效像素区域的对角线长度；
f/TL＝0.87，f为成像透镜组的有效焦距，TL为第一透镜L1的物侧面S1至成像透镜组的成像面S15在光轴上的距离；
f/f5＝1.15，f为成像透镜组的有效焦距，f5为第五透镜L5的有效焦距。
图2A示出了实施例1的成像透镜组的纵向球差曲线，其分别表示波长为470nm、510nm、555nm、610nm以及650nm的光线经由成像透镜组后的会聚焦点偏离；图2B示出了实施例1的成像透镜组的像散曲线，其表示子午像面弯曲和弧矢像面弯曲；图2C示出了实施例1的成像透镜组的畸变曲线，其表示不同像高情况下的畸变率；图2D示出了实施例1中参考波长光线经过成像透镜组的光路图。根据图2A至图2D可知，实施例1给出的成像透镜组能够实现良好的成像品质。
实施例2
以下参照图3至图4D描述本申请实施例2的成像透镜组。在本实施例中，为简洁起见，将省略部分与实施例1相似的描述。图3示出了本申请实施例2的成像透镜组的结构示意图。
如图3所示，成像透镜组沿着光轴从物侧至像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6和成像面S15。
第一透镜L1具有正屈折力，其物侧面S1为凸面，像侧面S2为凹面。
第二透镜L2具有负屈折力，其物侧面S3为凸面，像侧面S4为凹面.
第三透镜L3具有负屈折力，其物侧面S5为凸面，像侧面S6为凹面。
第四透镜L4具有正屈折力，其物侧面S7为凸面，像侧面S8为凹面。
第五透镜L5具有正屈折力，其物侧面S9为凹面，像侧面S10为凸面。
第六透镜L6具有正屈折力，其物侧面S11为凹面，像侧面S12为凹面。
第一透镜L1至第六透镜L6的各透镜的物侧面及像侧面均为非球面，非球面的设计能够解决视界歪曲的问题，也能够使透镜在较小、较薄且较平的情况下实现优良的光学成像效果，进而使成像透镜组具备小型化特性。
第一透镜L1至第六透镜L6的材质均为塑料，塑料材质的透镜能够减少成像透镜组的重量，同时还能降低生产成本。
物体OBJ与第一透镜L1之间还设置有光阑STO，以进一步提升成像透镜组的成像质量。
成像透镜组还包括具有物侧面S13和像侧面S14的滤光片L7。来自物体OBJ的光依序穿过各表面S1至S14并最终成像在成像面S15上。进一步的，滤光片L7为红外滤光片，用以滤除入射至成像透镜组的外界光线中的红外光线，避免成像失真。
表3示出了实施例2的成像透镜组的各透镜的表面类型、曲率半径、厚度、材质、折射率、阿贝数(即色散系数)和各透镜的有效焦距，其中，曲率半径、厚度、各透镜的有效焦距的单位均为毫米(mm)；表4示出了可用于实施例2中透镜非球面S1-S12的高次项系数，其中非球面面型可由实施例1中给出的公式(1)限定；表5示出了实施例2中给出的成像透镜组的相关参数数值。参考波长为540nm。
表3
Figure PCTCN2020070152-appb-000012
表4
Figure PCTCN2020070152-appb-000013
Figure PCTCN2020070152-appb-000014
表5
Figure PCTCN2020070152-appb-000015
图4A示出了实施例2的成像透镜组的纵向球差曲线，其分别表示不同波长的光线经由成像透镜组后的会聚焦点偏离；图4B示出了实施例2的成像透镜组的像散曲线，其表示子午像面弯曲和弧矢像面弯曲；图4C示出了实施例2的成像透镜组的畸变曲线，其表示不同像高情况下的畸变率；图4D示出了实施例2中参考波长光线经过成像透镜组的光路图。根据图4A至图4D可知，实施例2给出的成像透镜组能够实现良好的成像品质。
实施例3
以下参照图5至图6D描述本申请实施例3的成像透镜组。在本实施例中，为简洁起见，将省略部分与实施例1相似的描述。图5示出了本申请实施例3的成像透镜组的结构示意图。
如图5所示，成像透镜组沿着光轴从物侧至像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6和成像面S15。
第一透镜L1具有正屈折力，其物侧面S1为凸面，像侧面S2为凹面。
第二透镜L2具有负屈折力，其物侧面S3为凸面，像侧面S4为凹面.
第三透镜L3具有负屈折力，其物侧面S5为凸面，像侧面S6为凹面。
第四透镜L4具有正屈折力，其物侧面S7为凸面，像侧面S8为凹面。
第五透镜L5具有正屈折力，其物侧面S9为凹面，像侧面S10为凸面。
第六透镜L6具有正屈折力，其物侧面S11为凹面，像侧面S12为凹面。
第一透镜L1至第六透镜L6的各透镜的物侧面及像侧面均为非球面，非球面的设计能够解决视界歪曲的问题，也能够使透镜在较小、较薄且较平的情况下实现优良的光学成像效果，进而使成像透镜组具备小型化特性。
第一透镜L1至第六透镜L6的材质均为塑料，塑料材质的透镜能够减少成像透镜组的重量，同时还能降低生产成本。
物体OBJ与第一透镜L1之间还设置有光阑STO，以进一步提升成像透镜组的成像质量。
成像透镜组还包括具有物侧面S13和像侧面S14的滤光片L7。来自物体OBJ的光依序穿过各表面S1至S14并最终成像在成像面S15上。进一步的，滤光片L7为红外滤光片，用以滤除入射至成像透镜组的外界光线中的红外光线，避免成像失真。
表6示出了实施例3的成像透镜组的各透镜的表面类型、曲率半径、厚度、材质、折射率、阿贝数(即色散系数)和各透镜的有效焦距，其中，曲率半径、厚度、各透镜的有效焦距的单位均为毫米(mm)；表7示出了可用于实施例3中透镜非球面S1-S12的高次项系数，其中非球面面型可由实施例1中给出的公式(1)限定；表8示出了实施例3中给出的成像透镜组的相关参数数值。参考波长为540nm。
表6
Figure PCTCN2020070152-appb-000016
Figure PCTCN2020070152-appb-000017
表7
Figure PCTCN2020070152-appb-000018
表8
Figure PCTCN2020070152-appb-000019
图6A示出了实施例3的成像透镜组的纵向球差曲线，其分别表示不同波长的光线经由成像透镜组后的会聚焦点偏离；图6B示出了实施例3的成像透镜组的像散曲线，其表示子午像面弯曲和弧矢像面弯曲；图6C示出了实施例3的成像透镜组的畸变曲线，其表示不同像高情况下的畸变率；图6D示出了实施例3中参考波长光线经过成像透镜组的光路图。根据图6A至图6D可知，实施例3给出的成像透镜组能够实现良好的成像品质。
本申请还提供一种取像模组，包括如前文所述的成像透镜组；以及感光元件，感光元件设于成像透镜组的像侧，以接收由成像透镜组投射的携带图像信息的光。具体的，感光元件可以采用互补金属氧化物半导体(CMOS，Complementary Metal Oxide Semiconductor)图像传感器或者电荷耦合元件(CCD，Charge-coupled Device)图像传感器。
上述取像模组，利用前述成像透镜组可以拍摄的到清晰明亮的图像，同时该取像装置还具有小型化的特点，方便适配至如轻薄型电子设备等尺寸受限的装置。
本申请还提供一种电子装置，包括壳体以及如前文所述的取像模组，取像模组安装在该壳体上，用以获取图像。
具体的，取像模组设置在壳体内并从壳体暴露以获取图像，壳体可以给取像模组提供防尘、防水防摔等保护，壳体上开设有与取像模组对应的孔，以使光线从孔中穿入或穿出壳体。
上述电子装置，具有轻薄化的结构特点，利用如前文所述的取像模组可以拍摄得到明亮且清晰度高的图像，满足用户多场景、专业化的拍摄需求。
本申请实施例中所使用到的“电子装置”可包括，但不限于被设置成经由有线线路连接和/或经由无线接口接收或发送通信信号的装置。被设置成通过无线接口通信的电子装置可以被称为“无线通信终端”、“无线终端”或“移动终端”。移动终端的示例包括，但不限于卫星或蜂窝电话；可以组合蜂窝无线电电话与数据处理、传真以及数据通信能力的个人通信系统(personal communication system，PCS)终端；可以包括无线电电话、寻呼机、因特网/内联网接入、Web浏览器、记事簿、日历以及/或全球定位系统(global positioning system，GPS)接收器的个人数字助理(personal digital assistant，PDA)；以及常规膝上型和/或掌上型接收器或包括无线电电话收发器的其它电子装置。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对专利范围的限制。应当指出的是，对于本 领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种成像透镜组，沿着光轴由物侧至像侧依序包括：第一透镜、第二透镜、第三透镜、第四透镜、第五透镜和第六透镜，其特征在于，
    所述第一透镜具有正屈折力，且其物侧面近轴区域为凸面；
    所述第二透镜具有负屈折力；
    所述第三透镜具有负屈折力，且其物侧面近轴区域为凸面，像侧面近轴区域为凹面；
    所述第四透镜具有正屈折力，且其物侧面近轴区域为凸面，像侧面近轴区域为凹面；
    所述第五透镜具有正屈折力，且其物侧面近轴区域为凹面；
    所述第六透镜具有屈折力，且其物侧面和像侧面中至少一个表面包含至少一个反曲点；
    所述成像透镜组满足下列关系式：
    |f1/f|＜1；
    |R1/R2|＜1；
    Figure PCTCN2020070152-appb-100001
    其中，f为所述成像透镜组的有效焦距，f1为所述第一透镜的有效焦距，R1为所述第一透镜物侧面的曲率半径，R2为所述第一透镜像侧面的曲率半径，V1为所述第一透镜的阿贝数，V2为所述第二透镜的阿贝数，V3为所述第三透镜的阿贝数，V4为所述第四透镜的阿贝数。
  2. 根据权利要求1所述的成像透镜组，其特征在于，还包括光阑，所述光阑位于所述第一透镜的物侧。
  3. 根据权利要求1所述的成像透镜组，其特征在于，所述成像透镜组满足下列关系式：
    1＜(TL) 2/(ImgH*EPD)＜2；
    其中，TL为所述第一透镜的物侧面至所述成像透镜组的成像面在光轴上的距离，ImgH为所述成像透镜组的成像面上有效像素区域的对角线长度，EPD为所述成像透镜组的入瞳直径。
  4. 根据权利要求1所述的成像透镜组，其特征在于，所述成像透镜组满足下列关系式：
    2＜TL/EPD＜3；
    其中，TL为所述第一透镜的物侧面至所述成像透镜组的成像面在光轴上的距离，EPD为所述成像透镜组的入瞳直径。
  5. 根据权利要求1所述的成像透镜组，其特征在于，所述成像透镜组满足下列关系式：
    -0.3＜f/f3＜-0.01；
    其中，f3为所述第三透镜的有效焦距。
  6. 根据权利要求1所述的成像透镜组，其特征在于，所述成像透镜组满足下列关系式：
    0.4＜f/ImgH＜0.8；
    其中，ImgH为所述成像透镜组的成像面上有效像素区域的对角线长度。
  7. 根据权利要求1所述的成像透镜组，其特征在于，所述成像透镜组满足下列关系式：
    0.5＜f/TL＜1.5；
    其中，TL为所述第一透镜的物侧面至所述成像透镜组的成像面在光轴上的距离。
  8. 根据权利要求1所述的成像透镜组，其特征在于，所述成像透镜组满足下列关系式：
    0.5＜f/f5＜2；
    其中，f5为所述第五透镜的有效焦距。
  9. 一种取像模组，其特征在于，包括：如权利要求1-8任一项所述的摄像透镜组；以及感光元件，所述感光元件设于所述摄像透镜组的像侧。
  10. 一种电子装置，其特征在于，包括：壳体；以及如权利要求9所述的取像模组，所述取像模组安装在所述壳体上。
PCT/CN2020/070152 2020-01-02 2020-01-02 成像透镜组、取像模组及电子装置 WO2021134765A1 (zh)

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US4354743A (en) * 1979-09-18 1982-10-19 Olympus Optical Co., Ltd. Attachment lens system
US6320704B1 (en) * 1999-03-04 2001-11-20 Fuji Photo Optical Co., Ltd. Image readout lens and image readout apparatus using the same
CN105319677A (zh) * 2014-07-16 2016-02-10 先进光电科技股份有限公司 六片式成像镜头组
CN205333956U (zh) * 2015-06-08 2016-06-22 株式会社光学逻辑 摄像镜头
CN109669258A (zh) * 2017-10-16 2019-04-23 大立光电股份有限公司 成像用光学镜头、取像装置及电子装置
CN109975950A (zh) * 2017-12-27 2019-07-05 宁波舜宇车载光学技术有限公司 光学镜头

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4354743A (en) * 1979-09-18 1982-10-19 Olympus Optical Co., Ltd. Attachment lens system
US6320704B1 (en) * 1999-03-04 2001-11-20 Fuji Photo Optical Co., Ltd. Image readout lens and image readout apparatus using the same
CN105319677A (zh) * 2014-07-16 2016-02-10 先进光电科技股份有限公司 六片式成像镜头组
CN205333956U (zh) * 2015-06-08 2016-06-22 株式会社光学逻辑 摄像镜头
CN109669258A (zh) * 2017-10-16 2019-04-23 大立光电股份有限公司 成像用光学镜头、取像装置及电子装置
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