WO2022120575A1 - 光学系统、取像模组及电子装置 - Google Patents

光学系统、取像模组及电子装置 Download PDF

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WO2022120575A1
WO2022120575A1 PCT/CN2020/134551 CN2020134551W WO2022120575A1 WO 2022120575 A1 WO2022120575 A1 WO 2022120575A1 CN 2020134551 W CN2020134551 W CN 2020134551W WO 2022120575 A1 WO2022120575 A1 WO 2022120575A1
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Prior art keywords
lens
optical system
optical axis
object side
image side
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PCT/CN2020/134551
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English (en)
French (fr)
Inventor
邹金华
李明
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欧菲光集团股份有限公司
江西晶超光学有限公司
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Priority to PCT/CN2020/134551 priority Critical patent/WO2022120575A1/zh
Publication of WO2022120575A1 publication Critical patent/WO2022120575A1/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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Definitions

  • the present application relates to the technical field of optical imaging, and in particular, to an optical system, an imaging module and an electronic device.
  • the camera module is packaged in a small area of the screen, which is closely related to the design of the lens shape, and the requirements for lens specifications are getting higher and higher. Therefore, how to design a mobile phone lens with a small head diameter, a long depth, and a large field of view, while ensuring high imaging quality, has become an urgent problem to be solved at present.
  • an optical system is provided.
  • An optical system includes sequentially from an object side to an image side along an optical axis:
  • the second lens with negative refractive power the object side of the second lens is convex at the near optical axis, and is convex at the near circumference;
  • the fifth lens with negative refractive power the object side of the fifth lens is concave at the near optical axis, and is concave at the near circumference, and the object side and the image side of the fifth lens are both aspherical, and At least one of its object-side and image-side surfaces contains at least one inflection point; and,
  • the sixth lens with negative refractive power the object side of the sixth lens is convex at the near optical axis, and is convex at the near circumference;
  • optical system satisfies the following relation:
  • HFOV represents half of the maximum field angle of the optical system
  • TTL represents the distance on the optical axis from the object side of the first lens to the imaging surface of the optical system.
  • An imaging module includes the optical system described in the above embodiments and a photosensitive element, wherein the photosensitive element is arranged on the image side of the optical system.
  • An electronic device includes a casing and the imaging module described in the above embodiments, wherein the imaging module is mounted on the casing.
  • FIG. 1 shows a schematic structural diagram of an optical system according to Embodiment 1 of the present application
  • FIG. 2 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system of Embodiment 1, respectively;
  • FIG. 3 shows a schematic structural diagram of the optical system of Embodiment 2 of the present application
  • FIG. 4 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system of Embodiment 2, respectively;
  • FIG. 5 shows a schematic structural diagram of the optical system according to Embodiment 3 of the present application.
  • FIG. 6 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system of Embodiment 3, respectively;
  • FIG. 7 shows a schematic structural diagram of the optical system of Embodiment 4 of the present application.
  • FIG. 8 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system of Embodiment 4, respectively;
  • FIG. 9 shows a schematic structural diagram of the optical system of Embodiment 5 of the present application.
  • FIG. 10 respectively shows a longitudinal spherical aberration graph, an astigmatism graph and a distortion graph of the optical system of Embodiment 5;
  • FIG. 11 shows a schematic structural diagram of the optical system according to Embodiment 6 of the present application.
  • FIG. 12 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system of Embodiment 6, respectively;
  • FIG. 13 shows a schematic diagram of an imaging module according to an embodiment of the present application.
  • FIG. 14 shows a schematic diagram of an electronic device applying an imaging module according to an embodiment of the present application.
  • the expressions first, second, third, etc. are only used to distinguish one feature from another feature and do not imply any limitation on the feature. Accordingly, the first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
  • the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings.
  • the drawings are examples only and are not drawn strictly to scale.
  • the space on the side where the object is located relative to the optical element is called the object side of the optical element.
  • the image formed by the object relative to the side space where the optical element is located is called the image of the optical element. side.
  • 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. And define the positive direction of the distance from the object side to the image side.
  • the lens surface is convex and the position of the convex surface is not defined, it means that the surface of the lens is convex at least near the optical axis; if the surface of the lens is concave and the position of the concave surface is not defined, it means that the surface is convex.
  • the lens surface is concave at least near the optical axis.
  • near the optical axis refers to an area near the optical axis.
  • the concavity and convexity of the surface area of the lens are determined by the intersection of the light rays passing through the area in parallel with the optical axis on the image side or the object side.
  • the lens includes a region near the optical axis, a region near the circumference, and an extension for fixing the lens.
  • the imaging light does not pass through the extension, so the range from the area near the optical axis to the area near the circumference can be defined as the effective aperture range of the lens.
  • the following embodiments omit part of the extension part for the sake of brevity of the drawings.
  • the method for determining the area near the optical axis, the area near the circumference or the range of multiple areas is as follows:
  • a midpoint as an intersection point on the surface of the lens and the optical axis
  • the distance from the midpoint to the boundary of the effective aperture range of the lens is the effective semi-aperture of the lens
  • an inflection point is located on the surface of the lens and not located in
  • the tangent line passing through the inflection point is perpendicular to the optical axis (that is, the surface types on both sides of the inflexion point on the lens surface are opposite).
  • inflection point If there are several inflection points in the radial direction of the lens from the midpoint to the outside, they are the first inflection point and the second inflection point in sequence, and the inflexion point farthest from the midpoint within the effective aperture range of the lens is the Nth inflection point. Inflection point.
  • the range between the midpoint and the first inflection point as the area near the optical axis
  • the area radially outward from the Nth inflection point is the area near the circumference
  • the area between the first inflection point and the Nth inflection point According to each inflection point, it is divided into different areas; if there is no inflection point on the lens surface, the area near the optical axis is defined as the area corresponding to 0% to 50% of the effective semi-aperture, and the area near the circumference is defined as 50% of the effective semi-aperture. The area corresponding to % to 100%.
  • the present application provides an optical system with a small head, which can take into account a wide viewing angle and high imaging quality.
  • the optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the six lenses are from the first lens to the sixth lens along the optical axis from the object side to the image side Arranged in sequence, the imaging plane of the optical system is located on the image side of the sixth lens.
  • the six lenses are non-joint, that is, there is a distance between any two adjacent lenses.
  • the cemented surface of the two lenses needs to have a high-precision curved surface in order to achieve a high degree of closeness when the two lenses are cemented. Poor adhesion affects the overall optical imaging quality. Therefore, the six lenses in the optical system of the present invention are non-cemented lenses, which can effectively improve the problems caused by the cemented lenses.
  • the first lens has a positive refractive power, which facilitates the condensing of light into the system and focusing on the imaging plane, and also helps to shorten the overall length of the system and realize the miniaturization of the system.
  • the second lens has a negative refractive power, thereby helping to correct the spherical aberration generated by the first lens and further expanding the field of view of the optical system.
  • the object side surface of the second lens is a convex surface near the optical axis, and a convex surface near the circumference, thereby helping to focus light and ensuring image clarity.
  • the third lens has positive refractive power or negative refractive power.
  • the third lens can help the first lens share part of the positive refractive power, and can further shorten the total length of the system, and when the third lens has a negative refractive power, it helps to expand the field of view of the optical system.
  • the fourth lens has a positive refractive power, which can effectively improve the optical distortion of the system and further improve the imaging quality of the system.
  • the fifth lens has a negative refractive power, and the object side of the fifth lens is concave at the near optical axis and concave at the near circumference, which helps to expand the system field of view, correct the system spherical aberration, and is also conducive to Increase the optical back focus of the system to improve the imaging quality of the system.
  • the object side surface and the image side surface of the fifth lens are both aspherical.
  • the characteristics of aspheric lenses are: from the center of the lens to the periphery of the lens, the curvature is continuously changing. Unlike the spherical lens with a constant curvature from the center of the lens to the periphery of the lens, the aspheric lens has better imaging characteristics and has improved edge aberrations. And the advantages of astigmatic field curvature. In the above manner, the flexibility of lens design can be improved, aberrations can be corrected effectively, and the imaging quality of the optical system can be improved.
  • At least one surface of the object side surface and the image side surface of the fifth lens includes at least one inflection point, which is beneficial to reduce the incident angle of the chief ray of the off-axis field of view on the imaging surface and improve the pixel unit in the edge area of the photosensitive element.
  • the response efficiency ensures the illumination at the edge of the field of view, thereby reducing the generation of off-axis field of view aberrations and improving the imaging resolution capability of the system.
  • the sixth lens has a negative refractive power, and the object side of the sixth lens is convex at the near optical axis and convex at the near circumference, so that it can cooperate with the fifth lens to correct the spherical aberration generated by the lens group in front of the system, and also It is beneficial to correct the astigmatic aberration of the system, reduce stray light, and reduce the probability of ghosting. In addition, it also contributes to the reduction of the overall length of the optical system and the thinning of the system.
  • the optical system satisfies the following relationship: 0.24mm -1 ⁇ tan(HFOV)/TTL ⁇ 0.34mm -1 ; wherein, HFOV represents half of the maximum angle of view of the optical system, and TTL represents the object side of the first lens to the optical The distance of the imaging plane of the system on the optical axis.
  • the half of the maximum viewing angle in this application refers to the angle formed by the light incident at the maximum viewing angle and the optical axis of the system.
  • tan(HFOV)/TTL can be 0.25mm -1 , 0.26mm -1 , 0.27mm -1 , 0.28mm -1 , 0.29mm- 1 , 0.3mm -1 , 0.31mm -1 , 0.32mm -1 or 0.33mm -1 .
  • the field of view will not be too large, which will help the light collection of the system, thereby improving the imaging quality of the system.
  • the total length of the system will not be too large, which is conducive to the close arrangement of the system structure and the realization of small change.
  • tan(HFOV)/TTL When tan(HFOV)/TTL is lower than the lower limit, the system field of view is too small to meet the shooting requirements, or the total length of the system is too long, which is not conducive to miniaturization; and when tan(HFOV)/TTL is higher than the upper limit, the system If the field of view is too large, it will easily lead to insufficient light-collecting ability, thereby reducing the imaging quality.
  • the light emitted or reflected by the object enters the optical system from the object side direction, and passes through the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the first lens in sequence. Six lenses, which finally converge on the imaging surface.
  • the imaging resolution capability of the optical system can be enhanced and aberrations can be effectively corrected to ensure the clarity of the image;
  • a specific relationship is satisfied, it will help the light collection of the system, thereby improving the imaging quality of the system, and at the same time, the total length of the system will not be too large, which is conducive to the close arrangement of the system structure and the realization of miniaturization.
  • the object side and the image side of the first to sixth lenses may be aspherical.
  • the characteristics of the aspherical lens have been described above, and will not be repeated here.
  • the flexibility of lens design can be improved, aberration can be corrected effectively, and the imaging quality of the optical system can be improved. Corrects aberrations created during light transmission.
  • the surface of each lens can also be any combination of spherical and aspherical surfaces, which is not limited in the present application.
  • the optical system satisfies the following relationship: -13 ⁇ f2/f1 ⁇ -1; where f1 represents the effective focal length of the first lens, and f2 represents the effective focal length of the second lens.
  • f2/f1 can be -12, -11, -9, -7, -6, -5, -4, -3, or -2.
  • the combination of positive and negative lenses can cancel each other's spherical aberration, and the second lens provides negative refractive power, which can not only correct the spherical aberration generated by the first lens, but also further expand the field of view of the optical system.
  • f2/f1 is lower than the lower limit or higher than the upper limit, it is easy to cause the refractive power of the first lens or the second lens to exceed a reasonable value, so that the field angle of the system cannot be guaranteed, and additional aberrations are easily introduced, reducing the Image quality.
  • the optical system satisfies the following relationship: 45deg ⁇ HFOV ⁇ 51deg; and, TTL ⁇ 4.1mm.
  • HFOV can be 45deg, 46deg, 47deg, 48deg, 49deg, 50deg or 51deg and TTL can be 3.7mm, 3.8mm, 3.85mm, 3.9mm, 3.95mm or 4.0mm.
  • the optical system satisfies the following relationship: 0.25 ⁇ ET4/CT4 ⁇ 0.4; wherein CT4 represents the thickness of the fourth lens on the optical axis, and ET4 represents the maximum effective aperture of the fourth lens on the object side to its The distance of the maximum effective aperture of the image side in the direction of the optical axis.
  • ET4/CT4 can be 0.28, 0.3, 0.32, 0.33, 0.34, 0.35, 0.36 or 0.38.
  • ET4/CT4 When ET4/CT4 is lower than the lower limit, the edge thickness of the fourth lens is too thin, the thickness in the middle is too thick, and the lens is difficult to form; and when ET4/CT4 is higher than the upper limit, the edge thickness of the fourth lens is too thick, and there is room for system distortion and aberration correction. Insufficient, affecting the imaging quality of the system.
  • the optical system satisfies the following relationship:
  • CT1+CT2+CT3/SD32 0.8 ⁇ (CT1+CT2+CT3)/SD32 ⁇ 1.1; where CT1 represents the thickness of the first lens on the optical axis, CT2 represents the thickness of the second lens on the optical axis, and CT3 represents the thickness of the third lens on the optical axis. Thickness, SD32 represents the maximum effective half-aperture of the image side of the third lens. (CT1+CT2+CT3)/SD32 can be 0.85, 0.9, 0.93, 0.95, 1.0, 1.02 or 1.05.
  • the depth of the head of the system can be increased, so that the head of the system can be extended during assembly and can be closer to the screen glass, which is beneficial to the design of the small head lens module;
  • the ratio of the thickness of the group lens to the maximum effective half-aperture of the third lens is conducive to reducing the head diameter of the system, increasing the screen ratio, and reducing the tolerance and assembly sensitivity of the optical system.
  • the optical system satisfies the following relationship: -3 ⁇ f4/RS8 ⁇ -2; where f4 represents the effective focal length of the fourth lens, and RS8 represents the radius of curvature of the image side of the fourth lens at the optical axis .
  • f4/RS8 can be -2.9, -2.8, -2.7, -2.6, -2.5, -2.4, -2.3, -2.2, or -2.1.
  • the relationship between the effective focal length of the fourth lens and the radius of curvature of the image side of the fourth lens at the optical axis can be reasonably configured, so that the incident angle of the light entering the photosensitive element can be effectively controlled, so that the Improve the optical distortion of the system, make the system have less TV distortion, and improve the imaging quality.
  • f4/RS8 is lower than the lower limit or higher than the upper limit, the refractive power of the fourth lens is too strong or too weak, which is not conducive to controlling the incident angle of the chief ray of the system, making it difficult to correct distortion.
  • the optical system satisfies the following relationship: 1 ⁇ RS10/f5 ⁇ 8; where f5 represents the effective focal length of the fifth lens, and RS10 represents the curvature radius of the image side of the fifth lens at the optical axis.
  • RS10/f5 can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 2, 4, 6, 7 or 7.5.
  • the optical system satisfies the following relationship: 0.5 ⁇ f6/f5 ⁇ 2; wherein f5 represents the effective focal length of the fifth lens, and f6 represents the effective focal length of the sixth lens.
  • f6/f5 may be 0.6, 0.8, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7 or 1.9.
  • the element provides enough matching space to facilitate the assembly and adjustment of the photosensitive element, which in turn helps to better match the incident angle of the principal light on the photosensitive element and improve the imaging quality.
  • f6/f5 is lower than the lower limit, the refractive power of the fifth lens is insufficient and the spherical aberration correction of the system is difficult; The imaging quality of the system.
  • the optical system satisfies the following relationship: 1 ⁇ vd2-vd3 ⁇ 40; where vd2 represents the d-light Abbe number of the second lens, vd3 represents the d-light Abbe number of the third lens, and d-light Represents yellow light with a wavelength of 587.56 nm.
  • vd2-vd3 can be 2, 2.5, 4, 10, 13, 15, 18, 20, 25, 30 or 35.
  • the optical system satisfies the following relationship: 0.5 ⁇ RS6/RS5 ⁇ 10; where RS5 represents the radius of curvature of the object side of the third lens at the optical axis, and RS6 represents the image side of the third lens at the optical axis The radius of curvature at the axis.
  • RS6/RS5 can be 0.7, 0.8, 1, 2, 3, 4, 5, 6, 7, 8 or 9.
  • the surface shape of the third lens can be effectively controlled, so that when the third lens has a negative refractive power, it is beneficial to increase the angle of view of the system, and when the third lens has a positive refractive power, the
  • the surface shape of the two adjacent lenses at the front and rear is relatively compact, the overall surface shape of the system is relatively smooth, and the lens arrangement is more compact, so that the arrangement space of the rear lens group can be reasonably compressed, and the overall length of the optical system can be further shortened.
  • the lens group provides sufficient light focusing, which helps to balance various aberrations while reducing the overall length.
  • the optical system satisfies the following relationship: -9.5mm 2 ⁇ f6*RS11 ⁇ -4.5mm 2 ; where f6 represents the effective focal length of the sixth lens, and RS11 represents the object side of the sixth lens on the optical axis
  • the radius of curvature at . f6*RS11 can be -9mm 2 , -8.5mm 2 , -8mm 2 , -7.5mm 2 , -7mm 2 , -6.5mm 2 , -6mm 2 , -5.5mm 2 or -5mm 2 .
  • the curvature radius of the object side of the sixth lens can be corrected, thereby reducing the incident angle of the light entering the object side of the sixth lens, so as to effectively correct the astigmatic aberration of the system; at the same time, it can reduce the noise Light, reducing the probability of ghost images; and, it is also beneficial to compress the total length of the optical system, and realize the thinning of the system.
  • f6*RS11 is lower than the lower limit or higher than the upper limit, it is easy to cause the object side of the sixth lens to be too flat or too curved, so that the refractive power of the sixth lens is insufficient or too large, which is not conducive to controlling the incident on the object side of the sixth lens. angle, the astigmatic aberration of the system cannot be effectively corrected, and it also affects the thinning of the system.
  • a diaphragm is further provided in the optical system, so as to better control the size of the incident light beam and improve the imaging quality of the optical system. Further, the diaphragm is arranged on the object side of the first lens, or between the first lens and the second lens. Preferably, the diaphragm is an aperture diaphragm.
  • the aperture stop can be located on the surface of the lens (eg, the object side and the image side) and is in operative relationship with the lens, for example, by applying a light-blocking coating to the surface of the lens to form the aperture stop on that surface; or by clamping
  • the holder is fixedly clamped on the surface of the lens, and the holder structure located on the surface can limit the width of the image beam of the object point on the axis, thereby forming an aperture stop on the surface.
  • a filter is further arranged between the sixth lens and the imaging surface of the optical system, which is used to filter the light in the non-working wavelength band, so as to prevent the generation of false colors or ripples due to the interference of the non-working wavelength light. phenomenon to avoid image color distortion.
  • the filter may be an infrared cut-off filter, which is made of glass.
  • each lens in the optical system can be made of glass or all of plastic.
  • the lens made of plastic can reduce the weight of the optical system and the production cost, while the lens made of glass can make the optical system have better performance. excellent temperature tolerance and excellent optical properties.
  • the material of each lens is preferably plastic, so as to reduce the weight of the optical system and reduce the production cost on the premise of satisfying the imaging performance. It should be noted that the material of each lens in the optical system can also be any combination of glass and plastic, not necessarily all glass or all plastic.
  • the optical system may further include protective glass.
  • the protective glass is arranged on the image side of the sixth lens or the image side of the filter, which protects the photosensitive element, and can also prevent the photosensitive element from being contaminated with dust, thereby further ensuring the image quality. It should be pointed out that when the optical system is applied to electronic devices such as mobile phones and tablets, protective glass may not be provided to further reduce the weight of the electronic devices.
  • the optical system of the above-mentioned embodiments of the present application may employ multiple lenses, for example, the above-mentioned six lenses.
  • the above-mentioned optical system can have the characteristics of large angle of view, small total length and high imaging quality, so as to better meet the requirements of such as Application requirements of electronic devices such as mobile phones and tablets.
  • the number of lenses constituting the optical system can be changed to obtain various results and advantages described in this specification without departing from the technical solutions claimed in the present application.
  • Embodiment 1 of the present application will be described below with reference to FIGS. 1 to 2 .
  • FIG. 1 shows a schematic structural diagram of the optical system 100 of the first embodiment.
  • the optical system 100 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 sequence from the object side to the image side along the optical axis L6 and imaging plane S15.
  • the first lens L1 has a positive refractive power
  • the object side S1 and the image side S2 are both aspherical, wherein the object side S1 is convex at the near optical axis, and is convex near the circumference, and the image side S2 is at the near optical axis. Concave, concave near the circumference.
  • the second lens L2 has a negative refractive power
  • the object side S3 and the image side S4 are both aspherical, wherein the object side S3 is convex at the near optical axis, and is convex near the circumference, and the image side S4 is at the near optical axis. Concave, concave near the circumference.
  • the third lens L3 has a negative refractive power
  • the object side S5 and the image side S6 are both aspherical, wherein the object side S5 is concave at the near optical axis, and is concave near the circumference, and the image side S6 is at the near optical axis. Convex, convex near the circumference.
  • the fourth lens L4 has a positive refractive power, and its object side S7 and the image side S8 are both aspherical surfaces, wherein the object side S7 is a concave surface at the near optical axis, and a convex surface at the near circumference, and the image side S8 is at the near optical axis. Convex, convex near the circumference.
  • the fifth lens L5 has a negative refractive power
  • the object side S9 and the image side S10 are both aspherical surfaces, wherein the object side S9 is a concave surface at the near optical axis, and is concave at the near circumference, and the image side S10 is at the near optical axis. Concave, convex near the circumference.
  • the sixth lens L6 has a negative refractive power, and the object side S11 and the image side S12 are both aspherical, wherein the object side S11 is convex at the near optical axis, and is convex near the circumference, and the image side S12 is at the near optical axis. Concave, convex near the circumference.
  • the object side and the image side of the first lens L1 to the sixth lens L6 are set as aspherical surfaces, which is conducive to correcting aberrations and solving the problem of image surface distortion, and can also make the lenses smaller, thinner and flatter. In this way, excellent optical imaging effects can be achieved, thereby enabling the optical system 100 to have miniaturization characteristics.
  • a diaphragm STO is also provided on the object side of the first lens L1 to limit the size of the incident light beam and further improve the imaging quality of the optical system 100 .
  • the optical system 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and 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 plane S15.
  • the filter 110 is used to filter out the light in the non-working wavelength band, so as to prevent the phenomenon of false color or ripple caused by the interference of the non-working wavelength band, and avoid the color distortion of the image.
  • the filter 110 is an infrared cut filter, and its material is glass.
  • Table 1 shows the surface type, curvature radius, thickness, material, refractive index, Abbe number (ie, dispersion coefficient) of the lens of the optical system 100 of Embodiment 1, and the effective focal length of the lens, wherein the effective focal length, refractive index and The reference wavelength of Abbe number is 587.56nm, and the unit of curvature radius, thickness, and effective focal length of lens are all millimeters (mm).
  • the first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis
  • the second value is the distance from the image side of the lens to the rear surface in the image side direction on the optical axis
  • the value of the aperture ST0 in the "thickness” parameter column is the distance from the aperture ST0 to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis) on the optical axis.
  • the direction of the lens image side is the positive direction of the optical axis. When the value is negative, it means that the aperture ST0 is set to the right of the vertex of the surface. If the thickness of aperture STO is positive, the aperture is to the left of the vertex of the surface. side.
  • the aspheric surface type in a lens is defined by the following formula:
  • x is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis;
  • k is the conic coefficient;
  • Ai is the i-th order coefficient of the aspheric surface.
  • Table 2 below gives the higher order 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 distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S15 of the optical system 100 is 4.0 mm.
  • f2/f1 -11.73, wherein, f1 represents the effective focal length of the first lens L1, and f2 represents the effective focal length of the second lens L2.
  • ET4/CT4 0.358, where CT4 represents the thickness of the fourth lens L4 on the optical axis, and ET4 represents the maximum effective aperture of the fourth lens L4 from the object side S7 to the maximum effective aperture of the image side S8 in the direction of the optical axis the distance.
  • CT1+CT2+CT3/SD32 0.969, where CT1 represents the distance of the first lens L1 on the optical axis, CT2 represents the distance of the second lens L2 on the optical axis, and CT3 represents the third lens L3 on the optical axis The distance, SD32 represents the maximum effective semi-diameter of the image side S6 of the third lens L3.
  • f4/RS8 -2.215, where f4 represents the effective focal length of the fourth lens L4, and RS8 represents the curvature radius of the image side S8 of the fourth lens L4 at the optical axis.
  • RS10/f5 1.107, where f5 represents the effective focal length of the fifth lens L5, and RS10 represents the radius of curvature of the image side S10 of the fifth lens L5 at the optical axis.
  • f6/f5 1.643, where f5 represents the effective focal length of the fifth lens L5, and f6 represents the effective focal length of the sixth lens L6.
  • vd2-vd3 34.62, where vd2 represents the Abbe number of the d light of the second lens L2, and vd3 represents the Abbe number of the d light of the third lens L3.
  • RS6/RS5 9.448, where RS5 represents the curvature radius of the object side S5 of the third lens L3 at the optical axis, and RS6 represents the curvature radius of the image side S6 of the third lens L3 at the optical axis.
  • f6*RS11 -5.718mm 2 , where f6 represents the effective focal length of the sixth lens L6, and RS11 represents the radius of curvature of the object side surface S11 of the sixth lens L6 at the optical axis.
  • FIG. 2 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system 100 of Embodiment 1, respectively.
  • the longitudinal spherical aberration graph shows the focus point deviation of light with wavelengths of 486.13 nm, 587.56 nm and 656.27 nm after passing through the optical system 100 ; Meridional (T) field curvature and sagittal (S) field curvature; the distortion graph shows the distortion of light with a wavelength of 587.56 nm passing through the optical system 100 at different image heights. It can be seen from FIG. 2 that the optical system 100 given in Embodiment 1 can achieve good imaging quality.
  • Embodiment 2 of the present application will be described below with reference to FIGS. 3 to 4 .
  • descriptions similar to those in Embodiment 1 will be omitted for the sake of brevity.
  • FIG. 3 shows a schematic structural diagram of the optical system 100 of the second embodiment.
  • the optical system 100 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 sequence from the object side to the image side along the optical axis L6 and imaging plane S15.
  • the first lens L1 has a positive refractive power
  • the object side S1 and the image side S2 are both aspherical, wherein the object side S1 is convex at the near optical axis, and is convex near the circumference, and the image side S2 is at the near optical axis. Concave, convex near the circumference.
  • the second lens L2 has a negative refractive power
  • the object side S3 and the image side S4 are both aspherical, wherein the object side S3 is convex at the near optical axis, and is convex near the circumference, and the image side S4 is at the near optical axis. Concave, convex near the circumference.
  • the third lens L3 has a negative refractive power
  • the object side S5 and the image side S6 are both aspherical, wherein the object side S5 is concave at the near optical axis, and is concave near the circumference, and the image side S6 is at the near optical axis. Convex, concave near the circumference.
  • the fourth lens L4 has a positive refractive power, and its object side S7 and image side S8 are both aspherical surfaces, wherein the object side S7 is a concave surface at the near optical axis, and is concave at the near circumference, and the image side S8 is at the near optical axis. Convex, convex near the circumference.
  • the fifth lens L5 has a negative refractive power
  • the object side S9 and the image side S10 are both aspherical surfaces, wherein the object side S9 is a concave surface at the near optical axis, and is concave at the near circumference, and the image side S10 is at the near optical axis. Concave, convex near the circumference.
  • the sixth lens L6 has a negative refractive power, and the object side S11 and the image side S12 are both aspherical, wherein the object side S11 is convex at the near optical axis, and is convex near the circumference, and the image side S12 is at the near optical axis. Concave, convex near the circumference.
  • the materials of the first lens L1 to the sixth lens L6 are all plastic.
  • a diaphragm STO is also provided on the object side of the first lens L1 to limit the size of the incident light beam and further improve the imaging quality of the optical system 100 .
  • the optical system 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and 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 plane S15.
  • the filter 110 is an infrared cut filter, and its material is glass.
  • Table 3 shows the surface type, curvature radius, thickness, material, refractive index, Abbe number (ie, dispersion coefficient) of each lens of the optical system 100 of Embodiment 2, and the effective focal length of each lens, wherein the effective focal length, refraction
  • the reference wavelength of the ratio and Abbe number are both 587.56nm, and the units of curvature radius, thickness, and effective focal length of each lens are all millimeters (mm);
  • the coefficients of higher-order terms, where the aspheric surface type can be defined by the formula (1) given in Example 1.
  • FIG. 4 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system 100 of Embodiment 2, respectively.
  • the longitudinal spherical aberration graph shows the focus point deviation of light with wavelengths of 486.13 nm, 587.56 nm and 656.27 nm after passing through the optical system 100 ; Meridional (T) field curvature and sagittal (S) field curvature; the distortion graph shows the distortion of light with a wavelength of 587.56 nm passing through the optical system 100 at different image heights. It can be seen from FIG. 4 that the optical system 100 given in Embodiment 2 can achieve good imaging quality.
  • Embodiment 3 of the present application will be described below with reference to FIGS. 5 to 6 .
  • descriptions similar to those in Embodiment 1 will be omitted for the sake of brevity.
  • FIG. 5 shows a schematic structural diagram of the optical system 100 of the third embodiment.
  • the optical system 100 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 sequence from the object side to the image side along the optical axis L6 and imaging plane S15.
  • the first lens L1 has a positive refractive power
  • the object side S1 and the image side S2 are both aspherical, wherein the object side S1 is convex at the near optical axis, and is convex near the circumference, and the image side S2 is at the near optical axis. Convex, convex near the circumference.
  • the second lens L2 has a negative refractive power
  • the object side S3 and the image side S4 are both aspherical, wherein the object side S3 is convex at the near optical axis, and is convex near the circumference, and the image side S4 is at the near optical axis. Concave, convex near the circumference.
  • the third lens L3 has a positive refractive power
  • the object side S5 and the image side S6 are both aspherical, wherein the object side S5 is concave at the near optical axis, and is concave near the circumference, and the image side S6 is at the near optical axis. Convex, concave near the circumference.
  • the fourth lens L4 has a positive refractive power, and its object side S7 and the image side S8 are both aspherical surfaces, wherein the object side S7 is a concave surface at the near optical axis, and a convex surface at the near circumference, and the image side S8 is at the near optical axis. Convex, convex near the circumference.
  • the fifth lens L5 has a negative refractive power
  • the object side S9 and the image side S10 are both aspherical surfaces, wherein the object side S9 is a concave surface at the near optical axis, and is concave at the near circumference, and the image side S10 is at the near optical axis. Concave, convex near the circumference.
  • the sixth lens L6 has a negative refractive power, and the object side S11 and the image side S12 are both aspherical, wherein the object side S11 is convex at the near optical axis, and is convex near the circumference, and the image side S12 is at the near optical axis. Concave, convex near the circumference.
  • the materials of the first lens L1 to the sixth lens L6 are all plastic.
  • a diaphragm STO is also provided on the object side of the first lens L1 to limit the size of the incident light beam and further improve the imaging quality of the optical system 100 .
  • the optical system 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and 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 plane S15.
  • the filter 110 is an infrared cut filter, and its material is glass.
  • Table 5 shows the surface type, curvature radius, thickness, material, refractive index, Abbe number (ie, dispersion coefficient) of each lens of the optical system 100 of Embodiment 3, and the effective focal length of each lens, wherein the effective focal length, refraction
  • the reference wavelength of the ratio and Abbe number are both 587.56nm, and the units of curvature radius, thickness, and effective focal length of each lens are all millimeters (mm);
  • the coefficients of higher-order terms, where the aspheric surface type can be defined by the formula (1) given in Example 1.
  • FIG. 6 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system 100 of Embodiment 3, respectively.
  • the longitudinal spherical aberration graph shows the focus point deviation of light with wavelengths of 486.13 nm, 587.56 nm and 656.27 nm after passing through the optical system 100 ; Meridional (T) field curvature and sagittal (S) field curvature; the distortion graph shows the distortion of light with a wavelength of 587.56 nm passing through the optical system 100 at different image heights. It can be seen from FIG. 6 that the optical system 100 given in Embodiment 3 can achieve good imaging quality.
  • Embodiment 4 of the present application will be described below with reference to FIGS. 7 to 8 .
  • descriptions similar to those in Embodiment 1 will be omitted for the sake of brevity.
  • FIG. 7 shows a schematic structural diagram of the optical system 100 of the fourth embodiment.
  • the optical system 100 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 sequence from the object side to the image side along the optical axis L6 and imaging plane S15.
  • the first lens L1 has a positive refractive power
  • the object side S1 and the image side S2 are both aspherical, wherein the object side S1 is convex at the near optical axis, and is convex near the circumference, and the image side S2 is at the near optical axis. Concave, convex near the circumference.
  • the second lens L2 has a negative refractive power
  • the object side S3 and the image side S4 are both aspherical, wherein the object side S3 is convex at the near optical axis, and is convex near the circumference, and the image side S4 is at the near optical axis. Concave, concave near the circumference.
  • the third lens L3 has a negative refractive power
  • the object side S5 and the image side S6 are both aspherical, wherein the object side S5 is concave at the near optical axis, and is concave near the circumference, and the image side S6 is at the near optical axis. Convex, convex near the circumference.
  • the fourth lens L4 has a positive refractive power, and its object side S7 and image side S8 are both aspherical surfaces, wherein the object side S7 is a concave surface at the near optical axis, and is concave at the near circumference, and the image side S8 is at the near optical axis. Convex, convex near the circumference.
  • the fifth lens L5 has a negative refractive power
  • the object side S9 and the image side S10 are both aspherical surfaces, wherein the object side S9 is a concave surface at the near optical axis, and is concave at the near circumference, and the image side S10 is at the near optical axis. Concave, convex near the circumference.
  • the sixth lens L6 has a negative refractive power, and the object side S11 and the image side S12 are both aspherical, wherein the object side S11 is convex at the near optical axis, and is convex near the circumference, and the image side S12 is at the near optical axis. Concave, convex near the circumference.
  • the materials of the first lens L1 to the sixth lens L6 are all plastic.
  • a diaphragm STO is also provided on the object side of the first lens L1 to limit the size of the incident light beam and further improve the imaging quality of the optical system 100 .
  • the optical system 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and 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 plane S15.
  • the filter 110 is an infrared cut filter, and its material is glass.
  • Table 7 shows the surface type, curvature radius, thickness, material, refractive index, Abbe number (ie, dispersion coefficient) of each lens of the optical system 100 of Embodiment 4, and the effective focal length of each lens, wherein the effective focal length, refraction
  • the reference wavelength of the ratio and Abbe number are both 587.56nm, and the units of curvature radius, thickness, and effective focal length of each lens are all millimeters (mm);
  • the coefficients of higher-order terms, where the aspheric surface type can be defined by the formula (1) given in Example 1.
  • FIG. 8 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system 100 of Embodiment 4, respectively.
  • the longitudinal spherical aberration graph shows the focus point deviation of light with wavelengths of 486.13 nm, 587.56 nm and 656.27 nm after passing through the optical system 100 ; Meridional (T) field curvature and sagittal (S) field curvature; the distortion graph shows the distortion of light with a wavelength of 587.56 nm passing through the optical system 100 at different image heights. It can be seen from FIG. 8 that the optical system 100 given in Embodiment 4 can achieve good imaging quality.
  • Embodiment 5 of the present application will be described below with reference to FIGS. 9 to 10 .
  • descriptions similar to those in Embodiment 1 will be omitted for the sake of brevity.
  • FIG. 9 shows a schematic structural diagram of the optical system 100 of the fifth embodiment.
  • the optical system 100 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 sequence from the object side to the image side along the optical axis L6 and imaging plane S15.
  • the first lens L1 has a positive refractive power
  • the object side S1 and the image side S2 are both aspherical, wherein the object side S1 is convex at the near optical axis, and is convex near the circumference, and the image side S2 is at the near optical axis. Concave, concave near the circumference.
  • the second lens L2 has a negative refractive power
  • the object side S3 and the image side S4 are both aspherical, wherein the object side S3 is convex at the near optical axis, and is convex near the circumference, and the image side S4 is at the near optical axis. Concave, concave near the circumference.
  • the third lens L3 has a positive refractive power
  • the object side S5 and the image side S6 are both aspherical, wherein the object side S5 is concave at the near optical axis, and is concave near the circumference, and the image side S6 is at the near optical axis. Convex, convex near the circumference.
  • the fourth lens L4 has a positive refractive power, and its object side S7 and image side S8 are both aspherical surfaces, wherein the object side S7 is a concave surface at the near optical axis, and is concave at the near circumference, and the image side S8 is at the near optical axis. Convex, convex near the circumference.
  • the fifth lens L5 has a negative refractive power
  • the object side S9 and the image side S10 are both aspherical surfaces, wherein the object side S9 is a concave surface at the near optical axis, and is concave at the near circumference, and the image side S10 is at the near optical axis. Concave, convex near the circumference.
  • the sixth lens L6 has a negative refractive power, and the object side S11 and the image side S12 are both aspherical, wherein the object side S11 is convex at the near optical axis, and is convex near the circumference, and the image side S12 is at the near optical axis. Concave, convex near the circumference.
  • the materials of the first lens L1 to the sixth lens L6 are all plastic.
  • a diaphragm STO is further arranged between the first lens L1 and the second lens L2 to limit the size of the incident light beam and further improve the imaging quality of the optical system 100 .
  • the optical system 100 further includes a filter 110 provided on the image side of the sixth lens L6 and 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 plane S15.
  • the filter 110 is an infrared cut filter, and its material is glass.
  • Table 9 shows the surface type, curvature radius, thickness, material, refractive index, Abbe number (ie, dispersion coefficient) of each lens of the optical system 100 of Embodiment 5, and the effective focal length of each lens, wherein the effective focal length, refraction
  • the reference wavelength of the ratio and Abbe number are both 587.56nm, and the units of curvature radius, thickness, and effective focal length of each lens are all millimeters (mm);
  • the coefficients of higher-order terms, where the aspheric surface type can be defined by the formula (1) given in Example 1.
  • FIG. 10 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system 100 of Embodiment 5, respectively.
  • the longitudinal spherical aberration graph shows the focus point deviation of light with wavelengths of 486.13 nm, 587.56 nm and 656.27 nm after passing through the optical system 100 ; Meridional (T) field curvature and sagittal (S) field curvature; the distortion graph shows the distortion of light with a wavelength of 587.56 nm passing through the optical system 100 at different image heights. It can be seen from FIG. 10 that the optical system 100 given in Embodiment 5 can achieve good imaging quality.
  • Embodiment 6 of the present application will be described below with reference to FIGS. 11 to 12 .
  • descriptions similar to those in Embodiment 1 will be omitted for the sake of brevity.
  • FIG. 11 shows a schematic structural diagram of the optical system 100 of the sixth embodiment.
  • the optical system 100 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 sequence from the object side to the image side along the optical axis L6 and imaging plane S15.
  • the first lens L1 has a positive refractive power
  • the object side S1 and the image side S2 are both aspherical, wherein the object side S1 is convex at the near optical axis, and is convex near the circumference, and the image side S2 is at the near optical axis. Concave, concave near the circumference.
  • the second lens L2 has a negative refractive power
  • the object side S3 and the image side S4 are both aspherical, wherein the object side S3 is convex at the near optical axis, and is convex near the circumference, and the image side S4 is at the near optical axis. Concave, concave near the circumference.
  • the third lens L3 has a positive refractive power
  • the object side S5 and the image side S6 are both aspherical, wherein the object side S5 is concave at the near optical axis, and is concave near the circumference, and the image side S6 is at the near optical axis. Convex, convex near the circumference.
  • the fourth lens L4 has a positive refractive power, and its object side S7 and image side S8 are both aspherical surfaces, wherein the object side S7 is a concave surface at the near optical axis, and is concave at the near circumference, and the image side S8 is at the near optical axis. Convex, convex near the circumference.
  • the fifth lens L5 has a negative refractive power
  • the object side S9 and the image side S10 are both aspherical surfaces, wherein the object side S9 is a concave surface at the near optical axis, and is concave at the near circumference, and the image side S10 is at the near optical axis. Concave, convex near the circumference.
  • the sixth lens L6 has a negative refractive power, and the object side S11 and the image side S12 are both aspherical, wherein the object side S11 is convex at the near optical axis, and is convex near the circumference, and the image side S12 is at the near optical axis. Concave, convex near the circumference.
  • the materials of the first lens L1 to the sixth lens L6 are all plastic.
  • a diaphragm STO is further arranged between the first lens L1 and the second lens L2 to limit the size of the incident light beam and further improve the imaging quality of the optical system 100 .
  • the optical system 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and 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 plane S15.
  • the filter 110 is an infrared cut filter, and its material is glass.
  • FIG. 12 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system 100 of Embodiment 6, respectively.
  • the longitudinal spherical aberration graph shows the focus point deviation of light with wavelengths of 486.13 nm, 587.56 nm and 656.27 nm after passing through the optical system 100 ; Meridional (T) field curvature and sagittal (S) field curvature; the distortion graph shows the distortion of light with a wavelength of 587.56 nm passing through the optical system 100 at different image heights. It can be seen from FIG. 12 that the optical system 100 given in Embodiment 6 can achieve good imaging quality.
  • Table 13 shows the numerical values of the correlation expressions of the present invention corresponding to the above embodiments.
  • the present application further provides an image capturing module 200 , which includes the optical system 100 (as shown in FIG. 1 ) as described above; side, the photosensitive surface of the photosensitive element 210 coincides with the imaging surface S15.
  • the photosensitive element 210 can be a Complementary Metal Oxide Semiconductor (CMOS, Complementary Metal Oxide Semiconductor) image sensor or a charge-coupled device (CCD, Charge-coupled Device) image sensor
  • the imaging surface S15 is different according to the corresponding photosensitive element 210 , which can be a plane or a curved surface with any curvature, especially a curved surface with a concave surface facing the object side.
  • CMOS Complementary Metal Oxide Semiconductor
  • CCD Charge-coupled Device
  • the imaging module 200 further includes a lens barrel (not shown in the figure) for carrying the optical system 100 and a corresponding support device (not shown in the figure).
  • the image capturing module 200 further includes a driving device (not shown in the figure) and an image stabilization module (not shown in the figure).
  • the driving device can have an Auto-Focus function, and the driving method can use a voice coil motor (Voice Coil Motor, VCM), a Micro Electro-Mechanical Systems (MEMS), a piezoelectric system (Piezoelectric) , and drive systems such as Shape Memory Alloy.
  • the driving device can enable the optical system 100 to obtain a better imaging position, so that the subject can capture clear images under different object distances;
  • the image stabilization module can be an accelerometer, a gyroscope or a Hall element (Hall). Effect Sensor).
  • the driving device and the image stabilization module work together as an Optical Image Stabilization (OIS), by adjusting the displacement of the optical system 100 on the optical axis to compensate for the blurred image caused by shaking at the moment of shooting, or using the image in the image software Compensation technology to provide Electronic Image Stabilization (EIS) to further improve the imaging quality of dynamic and low-light scenes.
  • OIS Optical Image Stabilization
  • EIS Electronic Image Stabilization
  • the above-mentioned image capturing module 200 can capture images with a wide viewing angle and high quality by using the aforementioned optical system 100, and at the same time, the image capturing module also has the structural features of small head and total length, which can effectively increase the screen ratio.
  • the imaging module 200 can be applied to fields such as mobile phones, automobiles, monitoring, and medical treatment. Specifically, it can be used as a mobile phone camera, a car camera, a surveillance camera or an endoscope, etc., and has a broad market application range.
  • the present application further provides an electronic device 300 , which includes a casing 310 and the image capturing module 200 as described above.
  • the image capturing module 200 is installed on the casing 310 .
  • the image capturing module 200 is disposed in the housing 310 and exposed from the housing 310 to obtain images.
  • the housing 310 can provide the image capturing module 200 with protection from dust, water, and drop.
  • the housing 310 is provided with a A hole corresponding to the image capturing module 200, so that the light can pass through the hole or pass through the casing.
  • the above-mentioned electronic device 300 has the characteristics of light weight, and the use of the aforementioned imaging module 200 can realize clear shooting of large scenes, which is beneficial to improve the shooting experience of the user.
  • the electronic device 300 is further provided with a corresponding processing system, and the electronic device 300 can transmit the image to the corresponding processing system in time after capturing the image of the object, so that the system can make accurate analysis and judgment.
  • the term "electronic device” may also include, but is not limited to, a device configured to be connected via a wired line and/or to receive or transmit communication signals via a wireless interface.
  • An electronic device configured to communicate over a wireless interface may be referred to as a "wireless communication terminal", “wireless terminal” or “mobile terminal”.
  • mobile terminals include, but are not limited to, satellite or cellular telephones; personal communication system (PCS) terminals that may combine cellular radio telephones with data processing, facsimile, and data communication capabilities; may include radio telephones, pagers, Internet/ Personal digital assistants (PDAs) with intranet access, web browsers, memo pads, calendars, and/or global positioning system (GPS) receivers; and conventional laptops and/or palmtops A receiver or other electronic device including a radiotelephone transceiver.
  • PCS personal communication system
  • PDAs Internet/ Personal digital assistants
  • GPS global positioning system
  • electronic devices may also include 3D image capture devices, digital cameras, tablet computers, smart TVs, network monitoring equipment, driving recorders, reversing developing devices, multi-lens devices, identification systems, somatosensory game consoles and wearable devices, etc.
  • 3D image capture devices digital cameras, tablet computers, smart TVs, network monitoring equipment, driving recorders, reversing developing devices, multi-lens devices, identification systems, somatosensory game consoles and wearable devices, etc.

Abstract

一种光学系统（100）、取像模组（200）及电子装置（300）。光学系统（100）沿着光轴由物侧至像侧依序包括：具有正光焦度的第一透镜（L1）；具有负光焦度的第二透镜（L2），其物侧面于近光轴处为凸面，于近圆周处为凸面；具有光焦度的第三透镜（L3）；具有正光焦度的第四透镜（L4）；具有负光焦度第五透镜（L5），第五透镜（L5）的物侧面于近光轴处为凹面，于近圆周处为凹面，第五透镜（L5）的物侧面与像侧面均为非球面，且其物侧面与像侧面中至少一个表面包含至少一个反曲点；以及具有负光焦度第六透镜（L6），第六透镜（L6）的物侧面于近光轴处为凸面，于近圆周处为凸面。光学系统（100）在满足特定关系时能够在实现小头部、扩大视场角范围以及保证高品质成像方面取得平衡。

Description

光学系统、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，特别是涉及一种光学系统、取像模组及电子装置。
背景技术
随着摄像相关技术的不断发展，拍照已经成为智能电子产品的一种标配功能，消费者对有理想拍照效果的电子产品的需求也越来越高，一些高像素的光学镜头在配合优化软件算法的应用下，拍照效果十分优秀，给消费者带来了极佳的体验。然而，随着电荷耦合器件(CCD)和互补性氧化金属半导体元件(CMOS)等常用感光元件性能的提高及尺寸的增加，感光元件上的像元数也随之增加而像元尺寸越来越小，从而对成像镜头的成像分辨率以及小型化提出了更高的要求。
另一方面，手机挖孔屏的出现格外吸引消费者的注意，其摄像头模组被封装在屏幕很小的区域，这与镜头外型的设计息息相关，对镜头规格要求也越来越高。因此，如何设计出头部口径小、深度长，并且可获得大视野范围，同时能够保证高成像品质的手机镜头，成为目前急待解决的问题。
发明内容
根据本申请的各种实施例，提供一种光学系统。
一种光学系统，所述光学系统沿着光轴由物侧至像侧依序包括：
具有正光焦度的第一透镜；
具有负光焦度的第二透镜，所述第二透镜的物侧面于近光轴处为凸面，于近圆周处为凸面；
具有光焦度的第三透镜；
具有正光焦度的第四透镜；
具有负光焦度的第五透镜，所述第五透镜的物侧面于近光轴处为凹面，于近圆周处为凹面，所述第五透镜的物侧面与像侧面均为非球面，且其物侧面与像侧面中至少一个表面包含至少一个反曲点；以及，
具有负光焦度的第六透镜，所述第六透镜的物侧面于近光轴处为凸面，于近圆周处为凸面；
所述光学系统满足下列关系式：
0.24mm -1＜tan(HFOV)/TTL＜0.34mm -1；
其中，HFOV表示所述光学系统最大视场角的一半，TTL表示所述第一透镜的物侧面至所述光学系统的成像面在光轴上的距离。
一种取像模组，包括上述实施例所述的光学系统以及感光元件，所述感光元件设于所述光学系统的像侧。
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的光学系统的结构示意图；
图2分别示出了实施例1的光学系统的纵向球差曲线图、像散曲线图以及畸变曲线图；
图3示出了本申请实施例2的光学系统的结构示意图；
图4分别示出了实施例2的光学系统的纵向球差曲线图、像散曲线图以及畸变曲线图；
图5示出了本申请实施例3的光学系统的结构示意图；
图6分别示出了实施例3的光学系统的纵向球差曲线图、像散曲线图以及畸变曲线图；
图7示出了本申请实施例4的光学系统的结构示意图；
图8分别示出了实施例4的光学系统的纵向球差曲线图、像散曲线图以及畸变曲线图；
图9示出了本申请实施例5的光学系统的结构示意图；
图10分别示出了实施例5的光学系统的纵向球差曲线图、像散曲线图以及畸变曲线图；
图11示出了本申请实施例6的光学系统的结构示意图；
图12分别示出了实施例6的光学系统的纵向球差曲线图、像散曲线图以及畸变曲线图；
图13示出了本申请一实施例的取像模组的示意图；
图14示出了本申请一实施例的应用取像模组的电子装置的示意图。
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。
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。
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。
在本说明书中，物体相对于光学元件所处的一侧空间称为该光学元件的物侧，对应的，物体所成的像相对于光学元件所处的一侧空间称为该光学元件的像侧。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。并定义物侧至像侧为距离的正向。
另外，在下文的描述中，若出现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近光轴处为凸面；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近光轴处为凹面。此处近光轴处是指光轴附近的区域。具体的，透镜表面区域的凹凸系以平行通过该区域的光线与光轴的交点在像侧或物侧来判定。举例言之，当平行光线通过该区域后，光线会朝像侧聚焦且与光轴的交点位于像侧，则该区域为凸面；反之，若光线通过该区域后，光线发散且光线的延伸线与光轴的交点在物侧，则该区域为凹面。另外，透镜包括光轴附近区域、圆周附近区域以及用于固定透镜的延伸部。理想的情况下，成像光线并不会通过延伸部，因此可以将光轴附近区域至圆周附近区域的区域范围定义为透镜的有效口径范围。下述实施例为求附图简洁均省略了部分的延伸部。进一步的，判定光轴附近区域、圆周附近区域或多个区域的范围的方法如下：
首先定义一中点为该透镜表面上与光轴的一交点，自该中点至透镜有效口径范围边界的距离为透镜的有效半口径，而一反曲点是位于该透镜表面上且并非位于光轴上的一点，通过反曲点的一切线与光轴垂直(即该透镜表面上反曲点两侧的面型相反)。如果透镜的径向上自中点向外有数个反曲点，则依序为第一反曲点、第二反曲点，而透镜有效口径范围内距中 点最远的反曲点为第N反曲点。定义中点和第一反曲点之间的范围为光轴附近区域，第N反曲点径向上向外的区域为圆周附近区域，第一反曲点至第N反曲点之间的区域依各反曲点分为不同的区域；若透镜表面上无反曲点，该光轴附近的区域定义为有效半口径的0～50％对应的区域，圆周附近区域定义为有效半口径的50％～100％对应的区域。
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、图5、图7、图9及图11，本申请提供一种具有小头部，且可兼顾广视角及高成像品质的光学系统。该光学系统包括第一透镜、第二透镜、第三透镜、第四透镜、第五透镜及第六透镜，该六片透镜自第一透镜至第六透镜沿着光轴从物侧至像侧依序排列，光学系统的成像面位于第六透镜的像侧。详细的，该六片透镜非接合，即任意两个相邻透镜之间均具有一间距。由于接合透镜的制程较非接合透镜复杂，特别在两透镜的接合面需拥有高准度的曲面，以便达到两透镜接合时的高密合度，且在接合的过程中，也可能因偏位而造成密合度不佳，影响整体光学成像品质。因此，本发明光学系统中的六片透镜为非接合透镜，可有效改善接合透镜所产生的问题。
具体的，第一透镜具有正光焦度，从而有利于光线会聚入系统并聚焦至成像面，同时也有助于缩短系统总长，实现系统的小型化。
第二透镜具有负光焦度，从而有助于修正第一透镜产生的球差，并可进一步扩大光学系统的视场角。进一步的，第二透镜的物侧面于近光轴处为凸面，于近圆周处为凸面，从而有助于光线聚焦，保证成像的清晰度。
第三透镜具有正光焦度或负光焦度。当第三透镜具有正光焦度时，可帮助第一透镜分担部分的正屈光力，并可进一步缩短系统总长，当第三透镜具有负光焦度时，有助于扩大光学系统的视场角。
第四透镜具有正光焦度，可有效改善系统的光学畸变，进一步提升系统的成像品质。
第五透镜具有负光焦度，且第五透镜的物侧面于近光轴处为凹面，于近圆周处为凹面，从而有助于扩大系统视场角，修正系统球差，同时也有利于增加系统的光学后焦，提升系统的成像品质。
进一步的，第五透镜的物侧面和像侧面均为非球面。非球面透镜的特点是：从透镜中心到透镜周边，曲率是连续变化的，与从透镜中心到透镜周边具有恒定曲率的球面透镜不同，非球面透镜具有更佳的成像特性，具有改善边缘像差及像散场曲的优点。通过上述方式，可以提高透镜设计的灵活性，并有效地校正像差，提高光学系统的成像质量。更进一步的，第五透镜的物侧面与像侧面中至少一个表面包含至少一个反曲点，从而有利于减小成像面上离轴视场的主光线入射角度，提升感光元件边缘区域像素单元的响应效率，保证边缘视场的照度，进而减少离轴视场像差的产生，提升系统的成像解析能力。
第六透镜具有负光焦度，且第六透镜的物侧面于近光轴处为凸面，于近 圆周处为凸面，从而可与第五透镜配合修正系统前面透镜组产生的球差，同时也有利于修正系统的像散像差，并减少杂光，降低鬼影的产生几率。除此之外，还有助于压缩光学系统的总长，实现系统的薄型化。
进一步的，光学系统满足下列关系式：0.24mm -1＜tan(HFOV)/TTL＜0.34mm -1；其中，HFOV表示光学系统最大视场角的一半，TTL表示第一透镜的物侧面至光学系统的成像面在光轴上的距离。进一步的，本申请中最大视场角的一半是指以最大视角入射的光线与系统光轴所成的夹角。tan(HFOV)/TTL可以是0.25mm -1、0.26mm -1、0.27mm -1、0.28mm -1、0.29mm -1、0.3mm -1、0.31mm -1、0.32mm -1或0.33mm -1。在满足上述关系式时，视场角不会过大，有助于系统的光线收集，从而提升系统的成像品质，同时系统总长也不会过大，有利于系统结构的紧密排布，实现小型化。而当tan(HFOV)/TTL低于下限时，系统视场角过小无法满足拍摄要求，或是系统总长过长，不利于小型化；而当tan(HFOV)/TTL高于上限时，系统视场角过大而容易导致光线收集能力不足，进而降低成像品质。
当上述光学系统用于成像时，被摄物体发出或者反射的光线从物侧方向进入光学系统，并依次穿过第一透镜、第二透镜、第三透镜、第四透镜、第五透镜及第六透镜，最终汇聚到成像面上。
上述光学系统，通过选取合适数量的透镜并合理分配各透镜的屈折力和面型可以增强光学系统的成像解析能力并有效修正像差，保证图像的清晰度；另外在系统视场角和系统总长满足特定关系时，有助于系统的光线收集，从而提升系统的成像品质，同时系统总长也不会过大，有利于系统结构的紧密排布，实现小型化。
在示例性实施方式中，第一透镜至第六透镜的物侧面和像侧面可均为非球面。非球面透镜的特点已在前文中说明，此处不再赘述。通过上述方式，可以提高透镜设计的灵活性，并有效地校正像差，提高光学系统的成像质量，而将第一透镜至第六透镜的物侧面和像侧面均设置为非球面可更好地校正在光线传递过程中产生的像差。需要指出的是，在未背离本申请光学系统的技术方案的前提下，各透镜的表面也可以是球面和非球面的任意组合，本申请对此不做限制。
在示例性实施方式中，光学系统满足下列关系式：-13＜f2/f1＜-1；其中，f1表示第一透镜的有效焦距，f2表示第二透镜的有效焦距。f2/f1可以是-12、-11、-9、-7、-6、-5、-4、-3或-2。在满足上述关系式时，能够合理分配第一透镜、第二透镜的光焦度并合理配置透镜形状，从而有利于扩大系统的视场角。同时，正负透镜搭配可相互抵消彼此产生的球差，第二透镜提供负屈折力，不仅可以修正第一透镜产生的球差，还能进一步扩大光学系统的视场角。而当f2/f1低于下限或高于上限时，均容易导致第一透镜或第二透镜的光焦度大小超出合理值，从而无法保证系统的视场角，并且容易引入额外像差，降低成像品质。
在示例性实施方式中，光学系统满足下列关系式：45deg≤HFOV≤51deg； 且，TTL＜4.1mm。HFOV可以是45deg、46deg、47deg、48deg、49deg、50deg或51deg，TTL可以是3.7mm、3.8mm、3.85mm、3.9mm、3.95mm或4.0mm。通过控制HFOV和TTL满足上述关系，可更具体地展现光学系统大视角与短总长的特点，同时可避免视场角过大，防止系统的边缘光线收集能力不足而造成边缘视场低照度，降低成像品质。
在示例性实施方式中，光学系统满足下列关系式：0.25＜ET4/CT4＜0.4；其中，CT4表示第四透镜在光轴上的厚度，ET4表示第四透镜物侧面的最大有效口径处至其像侧面的最大有效口径处在光轴方向上的距离。ET4/CT4可以是0.28、0.3、0.32、0.33、0.34、0.35、0.36或0.38。在满足上述关系式时，可有效控制第四透镜的形状和厚薄比，从而降低透镜的成型难度，并有效校正系统畸变，保证光学系统的成像品质。当ET4/CT4低于下限时，第四透镜边缘厚度过薄，中部厚度过厚，透镜成型困难；而当ET4/CT4高于上限时，第四透镜边缘厚度过厚，系统畸变像差校正空间不足，影响系统的成像品质。
在示例性实施方式中，光学系统满足下列关系式：
0.8＜(CT1+CT2+CT3)/SD32＜1.1；其中，CT1表示第一透镜在光轴上的厚度，CT2表示第二透镜在光轴上的厚度，CT3表示第三透镜在光轴上的厚度，SD32表示第三透镜像侧面的最大有效半口径。(CT1+CT2+CT3)/SD32可以是0.85、0.9、0.93、0.95、1.0、1.02或1.05。在满足上述关系式时，可使系统的头部深度加大，从而在组装时系统头部伸出，能够更靠近屏幕玻璃，有利于小头部镜头模组的设计；同时通过选取合适的前组透镜厚度与第三透镜最大有效半口径的比值，有利于缩小系统的头部口径，提升屏占比，并降低光学系统的公差与组装敏感度。而当(CT1+CT2+CT3)/SD32低于下限时，第一透镜、第二透镜和第三透镜的中部厚度过薄，容易导致光学系统的敏感度增加；而当(CT1+CT2+CT3)/SD32高于上限时，第一透镜、第二透镜和第三透镜的中部厚度过厚，不利于光学系统的小型化。
在示例性实施方式中，光学系统满足下列关系式：-3＜f4/RS8＜-2；其中，f4表示第四透镜的有效焦距，RS8表示第四透镜的像侧面于光轴处的曲率半径。f4/RS8可以是-2.9、-2.8、-2.7、-2.6、-2.5、-2.4、-2.3、-2.2或-2.1。在满足上述关系式时，可以合理配置第四透镜的有效焦距和第四透镜的像侧面于光轴处的曲率半径之间的关系，从而可有效控制光线射入到感光元件的入射角，以改善系统的光学畸变，使系统具有较小的TV畸变，提升成像品质。而当f4/RS8低于下限或高于上限时，第四透镜屈光能力过强或偏弱，均不利于控制系统的主光线入射角，使得畸变校正困难。
在示例性实施方式中，光学系统满足下列关系式：1＜RS10/f5＜8；其中，f5表示第五透镜的有效焦距，RS10表示第五透镜的像侧面于光轴处的曲率半径。RS10/f5可以是1.1、1.2、1.3、1.4、1.5、1.6、1.7、1.8、2、4、6、7或7.5。在满足上述关系式时，可有效扩大系统的视场角，同时也有利于改善系统的像散像差，提高光学系统的成像质量。而当RS10/f5低于下限时，第五透镜提供的负屈光力不足，容易导致系统球差过大；而当RS10/f5高于 上限时，第五透镜的边缘会出现过度弯曲现象，从而导致系统中的杂散光增多，影响成像品质。
在示例性实施方式中，光学系统满足下列关系式：0.5＜f6/f5＜2；其中，f5表示所述第五透镜的有效焦距，f6表示所述第六透镜的有效焦距。f6/f5可以是0.6、0.8、1、1.1、1.2、1.3、1.4、1.5、1.6、1.7或1.9。在满足上述关系式时，有利于合理配置第五透镜和第六透镜的有效焦距，从而可有效抵消光学系统前面透镜组产生的球差，同时也有利于增大系统的光学后焦，为感光元件提供足够的匹配空间，便于感光元件的组装和调整，进而有助于更好地实现主光线在感光元件上的入射角匹配，提升成像品质。当f6/f5低于下限时，第五透镜屈光力不足而容易导致系统的球差校正困难；当f6/f5高于上限时，第五透镜的屈光力过强而容易造成系统像差修正过度，影响系统的成像品质。
在示例性实施方式中，光学系统满足下列关系式：1＜vd2-vd3＜40；其中，vd2表示第二透镜的d光阿贝数，vd3表示第三透镜的d光阿贝数，d光表示波长为587.56nm的黄光。vd2-vd3可以是2、2.5、4、10、13、15、18、20、25、30或35。在满足上述关系式时，有利于选择合适的透镜材料，从而可有效修正色差，避免系统拍摄时出现严重的紫边现象，进而提高光学系统的成像清晰度，提升光学系统的成像品质。
在示例性实施方式中，光学系统满足下列关系式：0.5＜RS6/RS5＜10；其中，RS5表示第三透镜的物侧面于光轴处的曲率半径，RS6表示第三透镜的像侧面于光轴处的曲率半径。RS6/RS5可以是0.7、0.8、1、2、3、4、5、6、7、8或9。在满足上述关系式时，可以有效控制第三透镜的表面形状，从而当第三透镜具有负光焦度时，有利于系统视场角的增大，当第三透镜具有正光焦度时，使前后相邻两透镜的面型比较紧凑，系统整体面型比较顺滑，透镜排布更紧密，从而可合理压缩后面透镜组的排布空间，进一步缩短光学系统的总长，同时，也可为后面透镜组提供足够的光线聚焦，有利于在缩短总长的同时平衡各种像差。而当RS6/RS5低于下限或高于上限时，容易导致第三透镜的像侧面过弯或物侧面过弯，不利于透镜成型，且容易造成杂散光增多，降低成像品质。
在示例性实施方式中，光学系统满足下列关系式：-9.5mm 2＜f6*RS11＜-4.5mm 2；其中，f6表示第六透镜的有效焦距，RS11表示第六透镜的物侧面于光轴处的曲率半径。f6*RS11可以是-9mm 2、-8.5mm 2、-8mm 2、-7.5mm 2、-7mm 2、-6.5mm 2、-6mm 2、-5.5mm 2或-5mm 2。在满足上述关系式时，可以对第六透镜物侧面的曲率半径进行修正，从而降低光线射入到第六透镜物侧面的入射角，以有效修正系统的像散像差；同时，可减少杂光，降低鬼影的产生几率；并且，也有利于压缩光学系统的总长，实现系统的薄型化。而当f6*RS11低于下限或高于上限时，容易造成第六透镜物侧面过平或过弯，使得第六透镜的屈光力不足或过大，从而不利于控制第六透镜物侧面上的入射角，无法有效修正系统的像散像差，同时也会对系统的薄型化造成影响。
在示例性实施方式中，光学系统中还设置有光阑，以更好地控制入射光束的大小，提升光学系统的成像质量。进一步的，光阑设于第一透镜的物侧，或是第一透镜和第二透镜之间。优选的，光阑为孔径光阑。孔径光阑可位于透镜的表面上(例如物侧面和像侧面)，并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于透镜的表面，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，第六透镜和光学系统的成像面之间还设置有滤光片，用于滤除非工作波段的光线，从而防止因非工作波段光线的干扰而产生伪色或波纹的现象，避免成像色彩失真。具体的，滤光片可以是红外截止滤光片，其材质为玻璃。
在示例性实施方式中，光学系统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光学系统的重量并降低生产成本，而玻璃材质的透镜可使光学系统具备较好的温度耐受特性以及优良的光学性能。进一步的，在光学系统应用于手机或平板时，各透镜的材质优选为塑料，以在满足成像性能的前提下减少光学系统的重量并降低生产成本。需要注意的是，光学系统中各透镜的材质也可以是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，光学系统还可以包括保护玻璃。保护玻璃设于第六透镜的像侧或滤光片的像侧，起到保护感光元件的作用，同时也可避免感光元件沾染落尘，进一步保证成像品质。需要指出的是，在光学系统应用于手机、平板等电子设备时，也可以不设置保护玻璃，以进一步减轻电子设备的重量。
本申请的上述实施方式的光学系统可采用多片透镜，例如上文所述的六片。通过合理分配各透镜焦距、屈折力、面型、厚度以及各透镜之间的轴上间距等，可以使上述光学系统具备大视场角、小总长以及高成像品质特性，从而更好地满足如手机、平板等电子设备的应用需求。然而，本领域的技术人员应当理解，在未背离本申请要求保护的技术方案的情况下，可改变构成光学系统的透镜数量，来获得本说明书中描述的各个结果和优点。
下面参照附图进一步描述可适用于上述实施方式的光学系统的具体实施例。
实施例1
以下参照图1至图2描述本申请实施例1的光学系统100。
图1示出了实施例1的光学系统100的结构示意图。如图1所示，光学系统100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和像侧面S2均为非球面，其中物侧面S1于近光轴处为凸面，于近圆周处为凸面，像侧面S2于近光轴处为凹面，于近圆周处为凹面。
第二透镜L2具有负屈折力，其物侧面S3和像侧面S4均为非球面，其中物侧面S3于近光轴处为凸面，于近圆周处为凸面，像侧面S4于近光轴处为凹面，于近圆周处为凹面。
第三透镜L3具有负屈折力，其物侧面S5和像侧面S6均为非球面，其中物侧面S5于近光轴处为凹面，于近圆周处为凹面，像侧面S6于近光轴处为凸面，于近圆周处为凸面。
第四透镜L4具有正屈折力，其物侧面S7和像侧面S8均为非球面，其中物侧面S7于近光轴处为凹面，于近圆周处为凸面，像侧面S8于近光轴处为凸面，于近圆周处为凸面。
第五透镜L5具有负屈折力，其物侧面S9和像侧面S10均为非球面，其中物侧面S9于近光轴处为凹面，于近圆周处为凹面，像侧面S10于近光轴处为凹面，于近圆周处为凸面。
第六透镜L6具有负屈折力，其物侧面S11和像侧面S12均为非球面，其中物侧面S11于近光轴处为凸面，于近圆周处为凸面，像侧面S12于近光轴处为凹面，于近圆周处为凸面。
将第一透镜L1至第六透镜L6的物侧面和像侧面均设置为非球面，有利于修正像差、解决像面歪曲的问题，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，进而使光学系统100具备小型化特性。
第一透镜L1的物侧还设置有光阑STO，以限制入射光束的大小，进一步提升光学系统100的成像质量。光学系统100还包括设于第六透镜L6像侧且具有物侧面S13和像侧面S14的滤光片110。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。滤光片110用于滤除非工作波段的光线，从而防止因非工作波段光线的干扰而产生伪色或波纹的现象，避免成像色彩失真。具体的，滤光片110为红外截止滤光片，其材质为玻璃。
表1示出了实施例1的光学系统100的透镜的表面类型、曲率半径、厚度、材质、折射率、阿贝数(即色散系数)和透镜的有效焦距，其中，有效焦距、折射率和阿贝数的参考波长均为587.56nm，曲率半径、厚度、透镜的有效焦距的单位均为毫米(mm)。另外，透镜的“厚度”参数列中的第一个数值为该透镜在光轴上的厚度，第二个数值为该透镜的像侧面至像侧方向的后一表面在光轴上的距离；光阑ST0于“厚度”参数列中的数值为光阑ST0至后一表面顶点(顶点指表面与光轴的交点)在光轴上的距离，我们默认第一透镜L1物侧面到最后一枚透镜像侧面的方向为光轴的正方向，当该值为负时，表明光阑ST0设置于该表面顶点的右侧，若光阑STO厚度为正值时，光阑在该表面顶点的左侧。
表1
Figure PCTCN2020134551-appb-000001
Figure PCTCN2020134551-appb-000002
透镜中的非球面面型由以下公式限定：
Figure PCTCN2020134551-appb-000003
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 PCTCN2020134551-appb-000004
Figure PCTCN2020134551-appb-000005
第一透镜L1的物侧面S1至光学系统100的成像面S15在光轴上的距离TTL为4.0mm。结合表1和表2中的数据可知，实施例1中的光学系统100满足：
tan(HFOV)/TTL＝0.259mm -1，其中，HFOV表示光学系统100最大视场角的一半，TTL表示第一透镜L1的物侧面S1至光学系统100的成像面S15在光轴上的距离。
f2/f1＝-11.73，其中，f1表示第一透镜L1的有效焦距，f2表示第二透镜L2的有效焦距。
HFOV＝46deg，TTL＝4.0mm。
ET4/CT4＝0.358，其中，CT4表示第四透镜L4在光轴上的厚度，ET4表示第四透镜L4物侧面S7的最大有效口径处至其像侧面S8的最大有效口径处在光轴方向上的距离。
(CT1+CT2+CT3)/SD32＝0.969，其中，CT1表示第一透镜L1在光轴上的距离，CT2表示第二透镜L2在光轴上的距离，CT3表示第三透镜L3在光轴上的距离，SD32表示第三透镜L3像侧面S6的最大有效半口径。
f4/RS8＝-2.215，其中，f4表示第四透镜L4的有效焦距，RS8表示第四透镜L4的像侧面S8于光轴处的曲率半径。
RS10/f5＝1.107，其中，f5表示第五透镜L5的有效焦距，RS10表示第五透镜L5的像侧面S10于光轴处的曲率半径。
f6/f5＝1.643，其中，f5表示第五透镜L5的有效焦距，f6表示第六透镜L6的有效焦距。
vd2-vd3＝34.62，其中，vd2表示第二透镜L2的d光阿贝数，vd3表示第三透镜L3的d光阿贝数。
RS6/RS5＝9.448，其中，RS5表示第三透镜L3的物侧面S5于光轴处的曲率半径，RS6表示第三透镜L3的像侧面S6于光轴处的曲率半径。
f6*RS11＝-5.718mm 2，其中，f6表示第六透镜L6的有效焦距，RS11表示第六透镜L6的物侧面S11于光轴处的曲率半径。
图2分别示出了实施例1的光学系统100的纵向球差曲线图、像散曲线图以及畸变曲线图。其中纵向球差曲线图示出了波长为486.13nm、587.56nm、656.27nm的光线经由光学系统100后的会聚焦点偏离；像散曲线图示出了波长为587.56nm的光线经由光学系统100后的子午(T)像面弯曲和弧矢(S)像面弯曲；畸变曲线图示出了波长为587.56nm的光线经由光学系统100后不同像高下的畸变。根据图2可知，实施例1给出的光学系统100能够实现良好的成像品质。
实施例2
以下参照图3至图4描述本申请实施例2的光学系统100。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示出了实施例2的光学系统100的结构示意图。如图3所示，光学系统100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和像侧面S2均为非球面，其中物侧面S1于近光轴处为凸面，于近圆周处为凸面，像侧面S2于近光轴处为凹面，于近圆周处为凸面。
第二透镜L2具有负屈折力，其物侧面S3和像侧面S4均为非球面，其中物侧面S3于近光轴处为凸面，于近圆周处为凸面，像侧面S4于近光轴处为凹面，于近圆周处为凸面。
第三透镜L3具有负屈折力，其物侧面S5和像侧面S6均为非球面，其中物侧面S5于近光轴处为凹面，于近圆周处为凹面，像侧面S6于近光轴处为凸面，于近圆周处为凹面。
第四透镜L4具有正屈折力，其物侧面S7和像侧面S8均为非球面，其中物侧面S7于近光轴处为凹面，于近圆周处为凹面，像侧面S8于近光轴处为凸面，于近圆周处为凸面。
第五透镜L5具有负屈折力，其物侧面S9和像侧面S10均为非球面，其中物侧面S9于近光轴处为凹面，于近圆周处为凹面，像侧面S10于近光轴处为凹面，于近圆周处为凸面。
第六透镜L6具有负屈折力，其物侧面S11和像侧面S12均为非球面，其中物侧面S11于近光轴处为凸面，于近圆周处为凸面，像侧面S12于近光轴处为凹面，于近圆周处为凸面。
第一透镜L1至第六透镜L6的材质均为塑料。第一透镜L1的物侧还设置有光阑STO，以限制入射光束的大小，进一步提升光学系统100的成像质量。光学系统100还包括设于第六透镜L6像侧且具有物侧面S13和像侧面S14的滤光片110。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。具体的，滤光片110为红外截止滤光片，其材质为玻璃。
表3示出了实施例2的光学系统100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，有效焦距、折射率和阿贝数的参考波长均为587.56nm，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3
Figure PCTCN2020134551-appb-000006
Figure PCTCN2020134551-appb-000007
表4
Figure PCTCN2020134551-appb-000008
图4分别示出了实施例2的光学系统100的纵向球差曲线图、像散曲线图以及畸变曲线图。其中纵向球差曲线图示出了波长为486.13nm、587.56nm、656.27nm的光线经由光学系统100后的会聚焦点偏离；像散曲线图示出了波 长为587.56nm的光线经由光学系统100后的子午(T)像面弯曲和弧矢(S)像面弯曲；畸变曲线图示出了波长为587.56nm的光线经由光学系统100后不同像高下的畸变。根据图4可知，实施例2给出的光学系统100能够实现良好的成像品质。
实施例3
以下参照图5至图6描述本申请实施例3的光学系统100。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示出了实施例3的光学系统100的结构示意图。如图5所示，光学系统100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和像侧面S2均为非球面，其中物侧面S1于近光轴处为凸面，于近圆周处为凸面，像侧面S2于近光轴处为凸面，于近圆周处为凸面。
第二透镜L2具有负屈折力，其物侧面S3和像侧面S4均为非球面，其中物侧面S3于近光轴处为凸面，于近圆周处为凸面，像侧面S4于近光轴处为凹面，于近圆周处为凸面。
第三透镜L3具有正屈折力，其物侧面S5和像侧面S6均为非球面，其中物侧面S5于近光轴处为凹面，于近圆周处为凹面，像侧面S6于近光轴处为凸面，于近圆周处为凹面。
第四透镜L4具有正屈折力，其物侧面S7和像侧面S8均为非球面，其中物侧面S7于近光轴处为凹面，于近圆周处为凸面，像侧面S8于近光轴处为凸面，于近圆周处为凸面。
第五透镜L5具有负屈折力，其物侧面S9和像侧面S10均为非球面，其中物侧面S9于近光轴处为凹面，于近圆周处为凹面，像侧面S10于近光轴处为凹面，于近圆周处为凸面。
第六透镜L6具有负屈折力，其物侧面S11和像侧面S12均为非球面，其中物侧面S11于近光轴处为凸面，于近圆周处为凸面，像侧面S12于近光轴处为凹面，于近圆周处为凸面。
第一透镜L1至第六透镜L6的材质均为塑料。第一透镜L1的物侧还设置有光阑STO，以限制入射光束的大小，进一步提升光学系统100的成像质量。光学系统100还包括设于第六透镜L6像侧且具有物侧面S13和像侧面S14的滤光片110。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。具体的，滤光片110为红外截止滤光片，其材质为玻璃。
表5示出了实施例3的光学系统100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，有效焦距、折射率和阿贝数的参考波长均为587.56nm，曲率半径、厚度、各透镜的有效焦距的单位均为毫米(mm)；表6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5
Figure PCTCN2020134551-appb-000009
表6
Figure PCTCN2020134551-appb-000010
Figure PCTCN2020134551-appb-000011
图6分别示出了实施例3的光学系统100的纵向球差曲线图、像散曲线图以及畸变曲线图。其中纵向球差曲线图示出了波长为486.13nm、587.56nm、656.27nm的光线经由光学系统100后的会聚焦点偏离；像散曲线图示出了波长为587.56nm的光线经由光学系统100后的子午(T)像面弯曲和弧矢(S)像面弯曲；畸变曲线图示出了波长为587.56nm的光线经由光学系统100后不同像高下的畸变。根据图6可知，实施例3给出的光学系统100能够实现良好的成像品质。
实施例4
以下参照图7至图8描述本申请实施例4的光学系统100。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7示出了实施例4的光学系统100的结构示意图。如图7所示，光学系统100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和像侧面S2均为非球面，其中物侧面S1于近光轴处为凸面，于近圆周处为凸面，像侧面S2于近光轴处为凹面，于近圆周处为凸面。
第二透镜L2具有负屈折力，其物侧面S3和像侧面S4均为非球面，其中物侧面S3于近光轴处为凸面，于近圆周处为凸面，像侧面S4于近光轴处为凹面，于近圆周处为凹面。
第三透镜L3具有负屈折力，其物侧面S5和像侧面S6均为非球面，其中物侧面S5于近光轴处为凹面，于近圆周处为凹面，像侧面S6于近光轴处为凸面，于近圆周处为凸面。
第四透镜L4具有正屈折力，其物侧面S7和像侧面S8均为非球面，其中物侧面S7于近光轴处为凹面，于近圆周处为凹面，像侧面S8于近光轴处为凸面，于近圆周处为凸面。
第五透镜L5具有负屈折力，其物侧面S9和像侧面S10均为非球面，其中物侧面S9于近光轴处为凹面，于近圆周处为凹面，像侧面S10于近光轴处为凹面，于近圆周处为凸面。
第六透镜L6具有负屈折力，其物侧面S11和像侧面S12均为非球面，其中物侧面S11于近光轴处为凸面，于近圆周处为凸面，像侧面S12于近光轴处为凹面，于近圆周处为凸面。
第一透镜L1至第六透镜L6的材质均为塑料。第一透镜L1的物侧还设置有光阑STO，以限制入射光束的大小，进一步提升光学系统100的成像质量。光学系统100还包括设于第六透镜L6像侧且具有物侧面S13和像侧面S14的滤光片110。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。具体的，滤光片110为红外截止滤光片，其材质为玻璃。
表7示出了实施例4的光学系统100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， 有效焦距、折射率和阿贝数的参考波长均为587.56nm，曲率半径、厚度、各透镜的有效焦距的单位均为毫米(mm)；表8示出了可用于实施例4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7
Figure PCTCN2020134551-appb-000012
表8
Figure PCTCN2020134551-appb-000013
Figure PCTCN2020134551-appb-000014
图8分别示出了实施例4的光学系统100的纵向球差曲线图、像散曲线图以及畸变曲线图。其中纵向球差曲线图示出了波长为486.13nm、587.56nm、656.27nm的光线经由光学系统100后的会聚焦点偏离；像散曲线图示出了波长为587.56nm的光线经由光学系统100后的子午(T)像面弯曲和弧矢(S)像面弯曲；畸变曲线图示出了波长为587.56nm的光线经由光学系统100后不同像高下的畸变。根据图8可知，实施例4给出的光学系统100能够实现良好的成像品质。
实施例5
以下参照图9至图10描述本申请实施例5的光学系统100。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9示出了实施例5的光学系统100的结构示意图。如图9所示，光学系统100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和像侧面S2均为非球面，其中物侧面S1于近光轴处为凸面，于近圆周处为凸面，像侧面S2于近光轴处为凹面，于近圆周处为凹面。
第二透镜L2具有负屈折力，其物侧面S3和像侧面S4均为非球面，其中物侧面S3于近光轴处为凸面，于近圆周处为凸面，像侧面S4于近光轴处为凹面，于近圆周处为凹面。
第三透镜L3具有正屈折力，其物侧面S5和像侧面S6均为非球面，其中物侧面S5于近光轴处为凹面，于近圆周处为凹面，像侧面S6于近光轴处为凸面，于近圆周处为凸面。
第四透镜L4具有正屈折力，其物侧面S7和像侧面S8均为非球面，其中物侧面S7于近光轴处为凹面，于近圆周处为凹面，像侧面S8于近光轴处为凸面，于近圆周处为凸面。
第五透镜L5具有负屈折力，其物侧面S9和像侧面S10均为非球面，其中物侧面S9于近光轴处为凹面，于近圆周处为凹面，像侧面S10于近光轴处为凹面，于近圆周处为凸面。
第六透镜L6具有负屈折力，其物侧面S11和像侧面S12均为非球面，其中物侧面S11于近光轴处为凸面，于近圆周处为凸面，像侧面S12于近光轴处为凹面，于近圆周处为凸面。
第一透镜L1至第六透镜L6的材质均为塑料。第一透镜L1和第二透镜L2之间还设置有光阑STO，以限制入射光束的大小，进一步提升光学系统100的成像质量。光学系统100还包括设于第六透镜L6像侧且具有物侧面S13和像 侧面S14的滤光片110。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。具体的，滤光片110为红外截止滤光片，其材质为玻璃。
表9示出了实施例5的光学系统100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，有效焦距、折射率和阿贝数的参考波长均为587.56nm，曲率半径、厚度、各透镜的有效焦距的单位均为毫米(mm)；表10示出了可用于实施例5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9
Figure PCTCN2020134551-appb-000015
表10
Figure PCTCN2020134551-appb-000016
Figure PCTCN2020134551-appb-000017
图10分别示出了实施例5的光学系统100的纵向球差曲线图、像散曲线图以及畸变曲线图。其中纵向球差曲线图示出了波长为486.13nm、587.56nm、656.27nm的光线经由光学系统100后的会聚焦点偏离；像散曲线图示出了波长为587.56nm的光线经由光学系统100后的子午(T)像面弯曲和弧矢(S)像面弯曲；畸变曲线图示出了波长为587.56nm的光线经由光学系统100后不同像高下的畸变。根据图10可知，实施例5给出的光学系统100能够实现良好的成像品质。
实施例6
以下参照图11至图12描述本申请实施例6的光学系统100。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11示出了实施例6的光学系统100的结构示意图。如图11所示，光学系统100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和像侧面S2均为非球面，其中物侧面S1于近光轴处为凸面，于近圆周处为凸面，像侧面S2于近光轴处为凹面，于近圆周处为凹面。
第二透镜L2具有负屈折力，其物侧面S3和像侧面S4均为非球面，其中物侧面S3于近光轴处为凸面，于近圆周处为凸面，像侧面S4于近光轴处为凹面，于近圆周处为凹面。
第三透镜L3具有正屈折力，其物侧面S5和像侧面S6均为非球面，其中物侧面S5于近光轴处为凹面，于近圆周处为凹面，像侧面S6于近光轴处为凸面，于近圆周处为凸面。
第四透镜L4具有正屈折力，其物侧面S7和像侧面S8均为非球面，其中物侧面S7于近光轴处为凹面，于近圆周处为凹面，像侧面S8于近光轴处为凸面，于近圆周处为凸面。
第五透镜L5具有负屈折力，其物侧面S9和像侧面S10均为非球面，其中物侧面S9于近光轴处为凹面，于近圆周处为凹面，像侧面S10于近光轴处为凹面，于近圆周处为凸面。
第六透镜L6具有负屈折力，其物侧面S11和像侧面S12均为非球面，其中物侧面S11于近光轴处为凸面，于近圆周处为凸面，像侧面S12于近光轴处为凹面，于近圆周处为凸面。
第一透镜L1至第六透镜L6的材质均为塑料。第一透镜L1和第二透镜L2之间还设置有光阑STO，以限制入射光束的大小，进一步提升光学系统100的成像质量。光学系统100还包括设于第六透镜L6像侧且具有物侧面S13和像侧面S14的滤光片110。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。具体的，滤光片110为红外截止滤光片，其材质为玻璃。
表11示出了实施例6的光学系统100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，有效焦距、折射率和阿贝数的参考波长均为587.56nm，曲率半径、厚度、各透镜的有效焦距的单位均为毫米(mm)；表12示出了可用于实施例6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11
Figure PCTCN2020134551-appb-000018
表12
Figure PCTCN2020134551-appb-000019
Figure PCTCN2020134551-appb-000020
图12分别示出了实施例6的光学系统100的纵向球差曲线图、像散曲线图以及畸变曲线图。其中纵向球差曲线图示出了波长为486.13nm、587.56nm、656.27nm的光线经由光学系统100后的会聚焦点偏离；像散曲线图示出了波长为587.56nm的光线经由光学系统100后的子午(T)像面弯曲和弧矢(S)像面弯曲；畸变曲线图示出了波长为587.56nm的光线经由光学系统100后不同像高下的畸变。根据图12可知，实施例6给出的光学系统100能够实现良好的成像品质。
表13示出了上述各实施例对应本发明相关关系式的数值。
表13
Figure PCTCN2020134551-appb-000021
Figure PCTCN2020134551-appb-000022
如图13所示，本申请还提供一种取像模组200，包括如前文所述的光学系统100(如图1所示)；以及感光元件210，感光元件210设于光学系统100的像侧，感光元件210的感光表面与成像面S15重合。具体的，感光元件210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，成像面S15依其对应的感光元件210的不同，可为一平面或有任意曲率的曲面，特别是指凹面朝往物侧方向的曲面。
另一些实施方式中，取像模组200还包括用于承载光学系统100的镜筒(图未示出)以及相应的支持装置(图未示出)。
除此之外，取像模组200还包括驱动装置(图未示出)以及影像稳定模块(图未示出)。其中驱动装置可具有自动对焦(Auto-Focus)功能，其驱动方式可使用如音圈马达(Voice Coil Motor，VCM)、微机电系统(Micro Electro-Mechanical Systems，MEMS)、压电系统(Piezoelectric)、以及记忆金属(Shape Memory Alloy)等驱动系统。驱动装置可让光学系统100取得较佳的成像位置，从而使被摄物于不同物距状态下，均能拍摄得到清晰的影像；影像稳定模块可以为加速计、陀螺仪或霍尔元件(Hall Effect Sensor)。驱动装置搭配影像稳定模块共同作为一光学防抖装置(Optical Image Stabilization，OIS)，通过调整光学系统100于光轴的位移以补偿拍摄瞬间因晃动而产生的模糊影像，或利用影像软件中的影像补偿技术，来提供电子防抖功能(Electronic Image Stabilization，EIS)，进一步提升动态以及低照度场景拍摄的成像品质。
上述取像模组200利用前述的光学系统100能够拍摄得到视角广、品质高的图像，同时取像模组还具有小头部、总长短的结构特点，可有效提高屏占比。取像模组200可应用于手机、汽车、监控、医疗等领域。具体可作为手机摄像头、车载摄像头、监控摄像头或内窥镜等，具有广阔的市场应用范围。
如图14所示，本申请还提供一种电子装置300，包括壳体310以及如前文所述的取像模组200，取像模组200安装在壳体310上。具体的，取像模组200设置在壳体310内并从壳体310暴露以获取图像，壳体310可以给取像模组200提供防尘、防水防摔等保护，壳体310上开设有与取像模组200对应的孔，以使光线从孔中穿入或穿出壳体。
上述电子装置300，具有轻量化的特点，且利用前述的取像模组200能够实现清晰的大场景景物拍摄，有利于提升用户的拍摄体验。在另一些实施方式中，上述电子装置300还设置有对应的处理系统，电子装置300在拍摄物体图像后可及时地将图像传送至对应的处理系统，以便系统做出准确的分析和判断。
另一些实施方式中，所使用到的“电子装置”还可包括，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。除此之外，“电子装置”还可包括三维影像撷取装置、数码相机、平板计算机、智能电视、网络监控设备、行车记录仪、倒车显影装置、多镜头装置、辨识系统、体感游戏机与穿戴式装置等。上述电子装置仅是示范性地说明本发明的实际运用例子，并非限制本申请的取像模组的运用范围。
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发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (13)

  1. 一种光学系统，其特征在于，所述光学系统沿着光轴由物侧至像侧依序包括，
    具有正光焦度的第一透镜；
    具有负光焦度的第二透镜，所述第二透镜的物侧面于近光轴处为凸面，于近圆周处为凸面；
    具有光焦度的第三透镜；
    具有正光焦度的第四透镜；
    具有负光焦度的第五透镜，所述第五透镜的物侧面于近光轴处为凹面，于近圆周处为凹面，所述第五透镜的物侧面与像侧面均为非球面，且其物侧面与像侧面中至少一个表面包含至少一个反曲点；以及，
    具有负光焦度的第六透镜，所述第六透镜的物侧面于近光轴处为凸面，于近圆周处为凸面；
    所述光学系统满足下列关系式：
    0.24mm -1＜tan(HFOV)/TTL＜0.34mm -1；
    其中，HFOV表示所述光学系统最大视场角的一半，TTL表示所述第一透镜的物侧面至所述光学系统的成像面在光轴上的距离。
  2. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足下列关系式：
    -13＜f2/f1＜-1；
    其中，f1表示所述第一透镜的有效焦距，f2表示所述第二透镜的有效焦距。
  3. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足下列关系式：
    45deg≤HFOV≤51deg；且，
    TTL＜4.1mm。
  4. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足下列关系式：
    0.25＜ET4/CT4＜0.4；
    其中，CT4表示所述第四透镜在光轴上的厚度，ET4表示所述第四透镜物侧面的最大有效口径处至其像侧面的最大有效口径处在光轴方向上的距离。
  5. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足下列关系式：
    0.8＜(CT1+CT2+CT3)/SD32＜1.1；
    其中，CT1表示所述第一透镜在光轴上的厚度，CT2表示所述第二透镜在光轴上的厚度，CT3表示所述第三透镜在光轴上的厚度，SD32表示所述第三透镜像侧面的最大有效半口径。
  6. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足下列关系式：
    -3＜f4/RS8＜-2；
    其中，f4表示所述第四透镜的有效焦距，RS8表示所述第四透镜的像侧面于光轴处的曲率半径。
  7. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足下列关系式：
    1＜RS10/f5＜8；
    其中，f5表示所述第五透镜的有效焦距，RS10表示所述第五透镜的像侧面于光轴处的曲率半径。
  8. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足下列关系式：
    0.5＜f6/f5＜2；
    其中，f5表示所述第五透镜的有效焦距，f6表示所述第六透镜的有效焦距。
  9. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足下列关系式：
    1＜vd2-vd3＜40；
    其中，vd2表示所述第二透镜的d光阿贝数，vd3表示所述第三透镜的d光阿贝数。
  10. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足下列关系式：
    0.5＜RS6/RS5＜10；
    其中，RS5表示所述第三透镜的物侧面于光轴处的曲率半径，RS6表示所述第三透镜的像侧面于光轴处的曲率半径。
  11. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足下列关系式：
    -9.5mm 2＜f6*RS11＜-4.5mm 2；
    其中，f6表示所述第六透镜的有效焦距，RS11表示所述第六透镜的物侧面于光轴处的曲率半径。
  12. 一种取像模组，其特征在于，包括如权利要求1-11任一项所述的光学系统以及感光元件，所述感光元件设于所述光学系统的像侧。
  13. 一种电子装置，其特征在于，包括壳体以及如权利要求12所述的取像模组，所述取像模组安装在所述壳体上。
PCT/CN2020/134551 2020-12-08 2020-12-08 光学系统、取像模组及电子装置 WO2022120575A1 (zh)

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