WO2022183473A1 - 光学系统、红外接收模组及电子设备 - Google Patents

光学系统、红外接收模组及电子设备 Download PDF

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Publication number
WO2022183473A1
WO2022183473A1 PCT/CN2021/079257 CN2021079257W WO2022183473A1 WO 2022183473 A1 WO2022183473 A1 WO 2022183473A1 CN 2021079257 W CN2021079257 W CN 2021079257W WO 2022183473 A1 WO2022183473 A1 WO 2022183473A1
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lens
optical system
image side
object side
optical axis
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PCT/CN2021/079257
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English (en)
French (fr)
Inventor
邹金华
李明
刘彬彬
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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/CN2021/079257 priority Critical patent/WO2022183473A1/zh
Publication of WO2022183473A1 publication Critical patent/WO2022183473A1/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 invention relates to the field of infrared detection, in particular to an optical system, an infrared receiving module and an electronic device.
  • an optical system an infrared receiving module, and an electronic device are provided.
  • An optical system comprising in sequence from the object side to the image side along the optical axis:
  • the image side of the first lens is concave at the near optical axis
  • the object side of the second lens is concave at the near optical axis
  • the image side of the third lens is concave at the near optical axis
  • FNO is the aperture number of the optical system
  • TT is the distance on the optical axis from the object side of the first lens to the image side of the third lens
  • f is the effective focal length of the optical system.
  • An infrared receiving module includes a photosensitive element and the optical system according to any one of the above embodiments, wherein the photosensitive element is arranged on the image side of the optical system.
  • An electronic device includes a casing and the above-mentioned infrared receiving module, wherein the infrared receiving module is arranged on the casing.
  • FIG. 1 is a schematic structural diagram of an optical system in a first embodiment of the present application
  • FIG. 2 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the first embodiment of the application;
  • FIG. 3 is a schematic structural diagram of an optical system in a second embodiment of the present application.
  • FIG. 4 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the second embodiment of the application;
  • FIG. 5 is a schematic structural diagram of an optical system in a third embodiment of the present application.
  • FIG. 6 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the third embodiment of the present application;
  • FIG. 7 is a schematic structural diagram of an optical system in a fourth embodiment of the present application.
  • FIG. 8 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the fourth embodiment of the present application;
  • FIG. 9 is a schematic structural diagram of an optical system in a fifth embodiment of the present application.
  • FIG. 10 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the fifth embodiment of the application;
  • FIG. 11 is a schematic structural diagram of an optical system in a sixth embodiment of the present application.
  • FIG. 13 is a schematic diagram of an infrared receiving module in an embodiment of the application.
  • FIG. 14 is a schematic diagram of an electronic device in an embodiment of the present application.
  • the optical system 100 sequentially includes a first lens L1 , a second lens L2 and a third lens L3 from the object side to the image side.
  • the first lens L1 includes an object side S1 and an image side S2
  • the second lens L2 includes an object side S3 and an image side S4
  • the third lens L3 includes an object side S5 and an image side S6.
  • the first lens L1 has a positive refractive power, which is beneficial to shorten the overall system length of the optical system 100 to meet the requirements of miniaturized design.
  • the image side S2 of the first lens L1 is concave at the near optical axis 110, which is beneficial to the divergence and deflection of light, and can reduce the deflection angle borne by each lens on the image side of the first lens L1, thereby helping to balance the light in each lens. deflection angle.
  • Both the second lens L2 and the third lens L3 have refractive power.
  • the object side surface S3 of the second lens L2 is concave at the near optical axis 110 , which is beneficial to correct the field curvature and astigmatism of the optical system 100 , thereby improving the imaging quality of the optical system 100 .
  • the image side surface S6 of the third lens L3 is concave at the near optical axis 110 , which is beneficial to improve the field curvature aberration of the optical system 100 .
  • the object side S5 and the image side S6 of the third lens L3 are both aspherical, which is beneficial to improve the design flexibility of the third lens L3, effectively correct the spherical aberration of the optical system 100, and improve the imaging quality.
  • at least one of the object side surface S5 and the image side surface S6 of the third lens L3 has an inflection point, which is beneficial to correct the aberration of the vertical-axis field of view and further improve the imaging quality of the optical system 100 .
  • both the second lens L2 and the third lens L3 have positive refractive power, which is conducive to the convergence of light, thereby shortening the overall system length of the optical system 100 and further meeting the requirements of miniaturized design.
  • the second lens L2 has a positive refractive power
  • the third lens L3 has a negative refractive power
  • it cooperates with the positive refractive power of the first lens L1 to balance the total length of the system and the angle of view, and shorten the total length of the system.
  • it is also beneficial to expand the field of view of the optical system 100 .
  • the optical system 100 is provided with a stop STO, and the stop STO may be arranged on the object side of the first lens L1, or on the object side of the first lens L1.
  • the optical system 100 further includes an infrared bandpass filter L4 disposed on the image side of the third lens L3, and the infrared bandpass filter L4 includes an object side S7 and an image side S8.
  • the optical system 100 further includes an image surface S9 on the image side of the third lens L3, the image surface S9 is the imaging surface of the optical system 100, and the incident light is adjusted by the first lens L1, the second lens L2 and the third lens L3 It can then be imaged on the image plane S9.
  • the infrared bandpass filter L4 is used to transmit infrared light.
  • the infrared bandpass filter L4 can allow infrared light of 930nm-950nm to pass through. Therefore, in some embodiments, the optical system 100 can be used to receive infrared light, and can be used in technologies such as TOF, LiDAR, etc. that use infrared light detection. Specifically, the optical system 100 can be used in the fields of face unlocking, automatic driving of cars, human-machine interface and games, industrial machine vision and measurement, security monitoring imaging systems, etc., to meet the needs of receiving infrared light.
  • the object side and the image side of each lens of the optical system 100 are aspherical.
  • the adoption of the aspherical structure can improve the flexibility of lens design, effectively correct spherical aberration, and improve image quality.
  • the object side surface and the image side surface of each lens of the optical system 100 may also be spherical surfaces. It should be noted that the above embodiments are only examples of some embodiments of the present application. In some embodiments, the surfaces of the lenses in the optical system 100 may be aspherical or any combination of spherical surfaces.
  • the material of each lens in the optical system 100 may be glass or plastic.
  • a lens made of plastic material can reduce the weight of the optical system 100 and reduce the production cost, and in combination with the smaller size of the optical system, a thin and light design of the optical system can be realized.
  • the lens made of glass enables the optical system 100 to have excellent optical performance and high temperature resistance.
  • the material of each lens in the optical system 100 can also be any combination of glass and plastic, and not necessarily all glass or all plastics.
  • the first lens L1 does not mean that there is only one lens.
  • the surface of the cemented lens closest to the object side can be regarded as the object side S1, and the surface closest to the image side can be regarded as the image side S2.
  • a cemented lens is not formed between the lenses in the first lens L1, but the distance between the lenses is relatively fixed.
  • the object side of the lens closest to the object side is the object side S1, and the lens closest to the image side The image side is the image side S2.
  • the number of lenses in the second lens L2 or the third lens L3 may be greater than or equal to two, and any adjacent lenses may form a cemented lens or a non-cemented lens.
  • the optical system 100 satisfies the conditional formula: 1.4 ⁇ FNO ⁇ 1.8; wherein, FNO is the aperture number of the optical system 100 .
  • the FNO may be: 1.4, 1.42, 1.46, 1.48, 1.50, 1.51, 1.55, 1.58, 1.62 or 1.76.
  • the optical system 100 satisfies the conditional formula: 0.8 ⁇ TT/f ⁇ 1.0; wherein, TT is the distance from the object side S1 of the first lens L1 to the image side S6 of the third lens L3 on the optical axis 110, f is the effective focal length of the optical system 100 .
  • TT/f may be: 0.855, 0.864, 0.877, 0.896, 0.915, 0.926, 0.955, 0.967, 0.971 or 0.992.
  • the ratio of TT and the effective focal length of the optical system 100 can be reasonably configured, which is conducive to shortening the total system length of the optical system 100, realizing a miniaturized design, and at the same time, it is also conducive to better focusing of light on the optical system 100. on the imaging surface.
  • the optical system 100 satisfies the conditional formula: 0.6 ⁇ tan(HFOV)*(SD32/IMGH) ⁇ 1.1; wherein, HFOV is half of the maximum angle of view of the optical system 100, and SD32 is the value of the third lens L3 Like the maximum effective half-aperture of the side surface S6, IMGH is half of the image height corresponding to the maximum angle of view of the optical system 100.
  • tan(HFOV)*(SD32/IMGH) can be: 0.636, 0.673, 0.710, 0.725, 0.788, 0.843, 0.852, 0.901, 0.963 or 1.
  • the angle of view of the optical system 100, the maximum effective half-aperture of the image side S6 of the third lens L3, and the half-image height of the optical system 100 can be reasonably configured, so that the optical system 100 has a large angle of view.
  • the optical system 100 can be matched with a photosensitive element having a rectangular photosensitive surface, and the imaging surface of the optical system 100 is coincident with the photosensitive surface of the photosensitive element.
  • the effective pixel area on the imaging surface of the optical system 100 has a horizontal direction and a diagonal direction, then HFOV can be understood as half of the maximum field of view in the diagonal direction of the optical system 100, and ImgH can be understood as the imaging surface of the optical system 100.
  • HFOV can be understood as half of the maximum field of view in the diagonal direction of the optical system 100
  • ImgH can be understood as the imaging surface of the optical system 100.
  • Half of the diagonal length of the upper effective pixel area can be understood as the imaging surface of the optical system 100.
  • the optical system 100 satisfies the conditional formula: 0.10mm ⁇ T12+T23 ⁇ 1.1mm; wherein, T12 is the distance between the image side S2 of the first lens L1 to the object side S3 of the second lens L2 on the optical axis 110 The distance, T23 is the distance from the image side S4 of the second lens L2 to the object side S5 of the third lens L3 on the optical axis 110 .
  • T12+T23 may be: 0.179, 0.252, 0.367, 0.412, 0.557, 0.623, 0.771, 0.823, 0.996 or 1.065, and the numerical unit is mm.
  • the distance between two adjacent lenses of the optical system 100 can be reasonably configured, thereby further shortening the total system length of the optical system 100 , which is beneficial to the miniaturized design of the optical system 100 .
  • the interval between two adjacent lenses is too small, which leads to an increase in the sensitivity of the optical system 100 , which is not conducive to the assembly of the optical system 100 .
  • Exceeding the upper limit of the above conditional expression the interval between two adjacent lenses is too large, and additional connecting elements such as spacer components are required to connect between the two adjacent lenses, which increases the cost of the optical system 100 and is not conducive to the performance of the optical system 100.
  • Miniaturized design is possible design.
  • the optical system 100 satisfies the conditional formula: 1.0 ⁇ f1/f ⁇ 18.0; wherein, f1 is the effective focal length of the first lens L1.
  • f1/f may be: 1.34, 2.01, 3.25, 5.36, 7.15, 8.33, 10.21, 12.07, 15.15 or 16.22.
  • the ratio between the effective focal length of the first lens L1 and the effective focal length of the optical system 100 can be reasonably configured, so that the first lens L1 provides sufficient positive refractive power for the optical system 100, which is conducive to the convergence of light.
  • the positive refractive power provided by the first lens L1 for the optical system 100 is insufficient, resulting in a decrease in the light-collecting capability of the optical system 100 .
  • the positive refractive power provided by the first lens L1 for the optical system 100 is too large, which is not conducive to the correction of the aberration generated by the first lens L1 as a whole by the second lens L2 and the third lens L3, and further The imaging quality of the optical system 100 is reduced, and at the same time, the surface shape of the first lens L1 is excessively curved, which is not conducive to the molding of the first lens L1, thereby reducing the manufacturing yield of the first lens L1.
  • the optical system 100 satisfies the conditional formula: -45 ⁇ R3/CT2 ⁇ -1; wherein, R3 is the radius of curvature of the object side surface S3 of the second lens L2 at the optical axis 110, and CT2 is the second lens L2 thickness on the optical axis 110.
  • R3/CT2 may be: -40, -32.01, -21.65, -11.33, -9.54, -8.03, -6.52, -5.36, -3.99, or -2.14.
  • the ratio of the curvature radius of the object side surface S3 of the second lens L2 at the optical axis 100 and the central thickness of the second lens L2 can be reasonably configured, so that the second lens L2 can effectively correct the optical system 100.
  • Field curvature and astigmatism improve the imaging quality of the optical system 100 .
  • the surface shape of the second lens L2 is too flat, which is not conducive to correcting the field curvature and astigmatism of the optical system 100 .
  • the object side surface S3 of the second lens L2 is prone to excessive inflection near the maximum effective aperture, resulting in increased stray light of the optical system 100 , thereby reducing the imaging quality of the optical system 100 .
  • the optical system 100 satisfies the conditional formula: 0.80mm ⁇ FFL ⁇ 1.05mm; wherein, FFL is the shortest distance from the image side S6 of the third lens L3 to the imaging plane of the optical system 100 in the direction of the optical axis 110 .
  • the FFL may be: 0.84, 0.86, 0.87, 0.89, 0.91, 0.93, 0.95, 0.97, 1.01 or 1.03, and the numerical unit is mm.
  • Exceeding the lower limit of the above conditional expression is beneficial to make the optical system 100 have enough assembly and debugging space during assembly, thereby improving the assembly yield of the optical system 100; at the same time, it is also beneficial to increase the focal depth of the optical system 100 so that The optical system 100 can acquire more depth information on the object side.
  • Below the upper limit of the above conditional expression it is advantageous to compress the axial dimension of the optical system 100 , thereby facilitating the miniaturized design of the optical system 100 .
  • the optical system 100 satisfies the conditional formula: 0.9 ⁇ f23/f ⁇ 2.5; wherein, f23 is the combined focal length of the second lens L2 and the third lens L3. Specifically, f23/f may be: 0.975, 1.325, 1.561, 1.685, 1.703, 1.872, 1.963, 2.015, 2.225 or 2.313.
  • the ratio of the combined focal length of the second lens L2 and the third lens L3 and the effective focal length of the optical system 100 can be reasonably configured, which is beneficial to shorten the overall system length of the optical system 100, and can also avoid the optical system 100.
  • the higher-order spherical aberration of increases excessively, which is beneficial to improve the imaging quality of the optical system 100 .
  • Exceeding the upper limit of the above conditional expression the combined focal length of the second lens L2 and the third lens L3 is too large, which is not conducive to shortening the overall system length of the optical system 100 while correcting the spherical aberration of the optical system 100 .
  • Below the lower limit of the above conditional expression the combined focal length of the second lens L2 and the third lens L3 is too small, then the overall refractive power of the second lens L2 and the third lens L3 is too strong, which is likely to cause excessive correction of spherical aberration, resulting in The imaging quality of the optical system 100 is degraded.
  • the optical system 100 satisfies the conditional formula: 1.2 ⁇ (R2+R1)/(R2-R1) ⁇ 50; wherein, R1 is the radius of curvature of the object side surface S1 of the first lens L1 at the optical axis 110, R2 is the radius of curvature of the image side surface S2 of the first lens L1 at the optical axis 110 .
  • R2+R1)/(R2-R1) may be: 1.575, 1.785, 1.993, 2.052, 2.133, 2.287, 10.637, 19.852, 30.647 or 47.328.
  • the curvature radii of the object side S1 and the image side S2 of the first lens L1 at the optical axis 110 can be reasonably configured to match the surface shape of the image side S2 of the first lens L1 at the near optical axis 110.
  • the optical deflection angle borne by the first lens L1 can be reasonably allocated, thereby helping to expand the maximum angle of view of the optical system 100 ; at the same time, it is also beneficial to correct the astigmatism of the off-axis field of view, thereby improving the imaging quality of the optical system 100 .
  • FIG. 1 is a schematic structural diagram of the optical system 100 in the first embodiment.
  • the optical system 100 sequentially includes a diaphragm STO, a first lens L1 with positive refractive power, and a The second lens L2 with negative refractive power and the third lens L3 with positive refractive power.
  • 2 is a graph of longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the first embodiment from left to right, wherein the reference wavelength of the astigmatism graph and the distortion graph is 940 nm, and the other embodiments are the same.
  • the object side surface S1 of the first lens L1 is a convex surface at the near optical axis 110, and is a convex surface at the circumference;
  • the image side surface S2 of the first lens L1 is concave at the near optical axis 110, and is concave at the circumference;
  • the object side surface S3 of the second lens L2 is concave at the near optical axis 110, and is concave at the circumference;
  • the image side surface S4 of the second lens L2 is a concave surface at the near optical axis 110, and a convex surface at the circumference;
  • the object side surface S5 of the third lens L3 is a convex surface at the near optical axis 110 and a concave surface at the circumference;
  • the image side surface S6 of the third lens L3 is concave at the near optical axis 110 and convex at the circumference.
  • the object side surface and the image side surface of the first lens L1 , the second lens L2 and the third lens L3 are all aspherical surfaces.
  • the shape of the surface from the center (the intersection of the surface and the optical axis 110) to the edge direction can be purely convex; Or transition from a convex shape at the center to a concave shape and then become convex near the maximum effective radius.
  • This is only an example for illustrating the relationship between the optical axis 110 and the circumference.
  • Various shapes and structures of the surface (concave-convex relationship) are not fully reflected, but other situations can be derived from the above examples.
  • the materials of the first lens L1 , the second lens L2 and the third lens L3 are all plastics.
  • FNO is the aperture number of the optical system 100 .
  • TT is the distance from the object side S1 of the first lens L1 to the image side S6 of the third lens L3 on the optical axis 110
  • f is the effective focal length of the optical system 100 .
  • the ratio of TT and the effective focal length of the optical system 100 can be reasonably configured, which is conducive to shortening the total system length of the optical system 100, realizing a miniaturized design, and at the same time, it is also conducive to better focusing of light on the optical system 100. on the imaging surface.
  • HFOV is half of the maximum angle of view of the optical system 100
  • SD32 is the maximum effective half-aperture of the image side S6 of the third lens L3
  • IMGH is half of the image height corresponding to the maximum angle of view of the optical system 100 .
  • the miniaturized design while realizing the miniaturized design, it is also beneficial to increase the field of view of the optical system 100; in addition, it is also beneficial to increase the focal depth of the image captured by the optical system 100, which is beneficial to the stereoscopic view of the object.
  • the acquisition of contour information furthermore, it is also beneficial to the correction of the distortion aberration of the optical system 100, so as to avoid the situation that the imaging is unclear and the image is severely deformed.
  • the distance between two adjacent lenses of the optical system 100 can be reasonably configured, thereby further shortening the total system length of the optical system 100, which is conducive to the miniaturization design of the optical system 100; 100 sensitivity, thereby facilitating the assembly of the optical system 100; in addition, the cost of the optical system 100 can also be reduced.
  • f1 is the effective focal length of the first lens L1.
  • the ratio between the effective focal length of the first lens L1 and the effective focal length of the optical system 100 can be reasonably configured, so that the first lens L1 provides sufficient positive refractive power for the optical system 100, which is conducive to the convergence of light;
  • the positive refractive power provided by the first lens L1 for the optical system 100 will not be too large, which is beneficial to the overall correction of the aberration generated by the first lens L1 by the second lens L2 and the third lens L3, thereby improving the optical system 100.
  • the surface shape of the first lens L1 will not be excessively curved, which is beneficial to the molding of the first lens L1, thereby improving the manufacturing yield of the first lens L1.
  • R3 is the radius of curvature of the object side surface S3 of the second lens L2 at the optical axis 110
  • CT2 is the thickness of the second lens L2 on the optical axis 110.
  • FFL is the shortest distance in the direction of the optical axis 110 from the image side S6 of the third lens L3 to the imaging surface of the optical system 100 .
  • Exceeding the lower limit of the above conditional expression is beneficial to make the optical system 100 have enough assembly and debugging space during assembly, thereby improving the assembly yield of the optical system 100; at the same time, it is also beneficial to increase the focal depth of the optical system 100 so that The optical system 100 can acquire more depth information on the object side.
  • Below the upper limit of the above conditional expression it is advantageous to compress the axial dimension of the optical system 100 , thereby facilitating the miniaturized design of the optical system 100 .
  • f23 is the combined focal length of the second lens L2 and the third lens L3.
  • the ratio of the combined focal length of the second lens L2 and the third lens L3 and the effective focal length of the optical system 100 can be reasonably configured, which is beneficial to shorten the overall system length of the optical system 100, and can also avoid the optical system 100.
  • the higher-order spherical aberration of increases excessively, which is beneficial to improve the imaging quality of the optical system 100 .
  • R1 is the radius of curvature of the object side surface S1 of the first lens L1 at the optical axis 110
  • R2 is the image of the first lens L1
  • the optical deflection angle borne by the first lens L1 can be reasonably allocated, thereby helping to expand the maximum angle of view of the optical system 100 ; at the same time, it is also beneficial to correct the astigmatism of the off-axis field of view, thereby improving the imaging quality of the optical system 100 .
  • the image plane S9 in Table 1 can be understood as the imaging plane of the optical system 100 .
  • the elements from the object plane (not shown) to the image plane S9 are sequentially arranged in the order of the elements in Table 1 from top to bottom.
  • the Y radius in Table 1 is the curvature radius of the object side surface or the image side surface of the corresponding surface number at the optical axis 110 .
  • the surface number S1 and the surface number S2 are the object side S1 and the image side S2 of the first lens L1 respectively, that is, in the same lens, the surface with the smaller surface number is the object side, and the surface with the larger surface number is the image side.
  • the first value in the "thickness" parameter column of the first lens L1 is the thickness of the lens on the optical axis 110, and the second value is the rear surface of the lens in the direction from the image side to the image side on the optical axis 110 the distance.
  • the optical system 100 may not be provided with the infrared bandpass filter L4, but at this time, the distance from the image side S6 to the image plane S9 of the third lens L3 remains unchanged .
  • the reference wavelength of the focal length of each lens is 940 nm
  • the reference wavelength of the refractive index and Abbe number of each lens is 587.56 nm, and other embodiments are also the same.
  • the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 2.
  • the surface serial numbers from S1-S6 respectively represent the image side or the object side S1-S6.
  • K-A20 represent the types of aspheric coefficients, where K represents the conic coefficient, A4 represents the fourth-order aspheric coefficient, A6 represents the sixth-order aspheric coefficient, and A8 represents the eight-order aspheric coefficient. analogy.
  • the aspheric coefficient formula is as follows:
  • Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the surface vertex
  • r is the distance from the corresponding point on the aspherical surface to the optical axis 110
  • c is the curvature of the aspherical vertex
  • k is the conic coefficient
  • Ai is the aspherical surface.
  • FIG. 2 includes a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of the optical system 100 , which represents the deviation of the converging focus of light of different wavelengths after passing through the lens.
  • the ordinate of the longitudinal spherical aberration map represents the normalized pupil coordinate (Normalized Pupil Coordinator) from the pupil center to the pupil edge, and the abscissa represents the distance from the imaging plane to the intersection of the light ray and the optical axis 110 (unit is mm) .
  • Figure 2 also includes a field curvature diagram (ASTIGMATIC FIELD CURVES) of the optical system 100, wherein the S curve represents the sagittal field curvature at 940 nm and the T curve represents the meridional field curvature at 940 nm. It can be seen from the figure that the field curvature of the optical system 100 is small, the field curvature and astigmatism of each field of view are well corrected, and the center and edge of the field of view have clear images.
  • FIG. 2 also includes a distortion diagram (DISTORTION) of the optical system 100. It can be seen from the diagram that the image distortion caused by the main beam is small, and the imaging quality of the system is excellent.
  • DISTORTION distortion diagram
  • FIG. 3 is a schematic structural diagram of the optical system 100 in the second embodiment.
  • the optical system 100 sequentially includes a diaphragm STO, a first lens L1 with positive refractive power, and a lens from the object side to the image side.
  • FIG. 2 is a graph showing longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the second embodiment from left to right.
  • the object side surface S1 of the first lens L1 is a convex surface at the near optical axis 110, and is a convex surface at the circumference;
  • the image side surface S2 of the first lens L1 is concave at the near optical axis 110, and is concave at the circumference;
  • the object side surface S3 of the second lens L2 is concave at the near optical axis 110, and is concave at the circumference;
  • the image side surface S4 of the second lens L2 is a concave surface at the near optical axis 110, and a convex surface at the circumference;
  • the object side surface S5 of the third lens L3 is a convex surface at the near optical axis 110, and is a convex surface at the circumference;
  • the image side surface S6 of the third lens L3 is concave at the near optical axis 110 and convex at the circumference.
  • the object side surface and the image side surface of the first lens L1 , the second lens L2 and the third lens L3 are all aspherical surfaces.
  • the materials of the first lens L1 , the second lens L2 and the third lens L3 are all plastics.
  • the parameters of the optical system 100 are given in Table 3, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.
  • the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 4, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.
  • FIG. 5 is a schematic structural diagram of the optical system 100 in the third embodiment.
  • the optical system 100 sequentially includes a diaphragm STO, a first lens L1 with positive refractive power, and a The second lens L2 with positive refractive power and the third lens L3 with positive refractive power.
  • FIG. 6 is a graph showing longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the third embodiment from left to right.
  • the object side surface S1 of the first lens L1 is a convex surface at the near optical axis 110, and is a convex surface at the circumference;
  • the image side surface S2 of the first lens L1 is concave at the near optical axis 110, and is concave at the circumference;
  • the object side surface S3 of the second lens L2 is concave at the near optical axis 110, and is concave at the circumference;
  • the image side surface S4 of the second lens L2 is a convex surface at the near optical axis 110, and is a convex surface at the circumference;
  • the object side surface S5 of the third lens L3 is a convex surface at the near optical axis 110 and a concave surface at the circumference;
  • the image side surface S6 of the third lens L3 is concave at the near optical axis 110 and convex at the circumference.
  • the object side surface and the image side surface of the first lens L1 , the second lens L2 and the third lens L3 are all aspherical surfaces.
  • the materials of the first lens L1 , the second lens L2 and the third lens L3 are all plastics.
  • the parameters of the optical system 100 are given in Table 5, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.
  • the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 6, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.
  • FIG. 7 is a schematic structural diagram of the optical system 100 in the fourth embodiment.
  • the optical system 100 sequentially includes a diaphragm STO, a first lens L1 with positive refractive power, and a lens from the object side to the image side.
  • FIG. 8 is a graph showing longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the fourth embodiment from left to right.
  • the object side surface S1 of the first lens L1 is a convex surface at the near optical axis 110 and a concave surface at the circumference;
  • the image side surface S2 of the first lens L1 is a concave surface at the near optical axis 110, and a convex surface at the circumference;
  • the object side surface S3 of the second lens L2 is concave at the near optical axis 110, and is concave at the circumference;
  • the image side surface S4 of the second lens L2 is a convex surface at the near optical axis 110, and is a convex surface at the circumference;
  • the object side surface S5 of the third lens L3 is a convex surface at the near optical axis 110, and is a convex surface at the circumference;
  • the image side surface S6 of the third lens L3 is concave at the near optical axis 110 and convex at the circumference.
  • the object side surface and the image side surface of the first lens L1 , the second lens L2 and the third lens L3 are all aspherical surfaces.
  • the materials of the first lens L1 , the second lens L2 and the third lens L3 are all plastics.
  • the parameters of the optical system 100 are given in Table 7, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.
  • the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 8, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.
  • FIG. 9 is a schematic structural diagram of the optical system 100 in the fifth embodiment.
  • the optical system 100 sequentially includes a diaphragm STO, a first lens L1 with positive refractive power, and a The second lens L2 with positive refractive power and the third lens L3 with negative refractive power.
  • FIG. 10 is a graph showing longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the fifth embodiment from left to right.
  • the object side surface S1 of the first lens L1 is a convex surface at the near optical axis 110, and is a convex surface at the circumference;
  • the image side surface S2 of the first lens L1 is a concave surface at the near optical axis 110, and a convex surface at the circumference;
  • the object side surface S3 of the second lens L2 is a concave surface at the near optical axis 110, and a convex surface at the circumference;
  • the image side surface S4 of the second lens L2 is a convex surface at the near optical axis 110 and a concave surface at the circumference;
  • the object side surface S5 of the third lens L3 is a convex surface at the near optical axis 110 and a concave surface at the circumference;
  • the image side surface S6 of the third lens L3 is concave at the near optical axis 110 and convex at the circumference.
  • the object side surface and the image side surface of the first lens L1 , the second lens L2 and the third lens L3 are all aspherical surfaces.
  • the materials of the first lens L1 , the second lens L2 and the third lens L3 are all plastics.
  • the parameters of the optical system 100 are given in Table 9, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.
  • the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 10, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.
  • FIG. 11 is a schematic structural diagram of the optical system 100 in the sixth embodiment.
  • the optical system 100 sequentially includes a diaphragm STO, a first lens L1 with positive refractive power, and a The second lens L2 with positive refractive power and the third lens L3 with negative refractive power.
  • FIG. 12 is a graph of longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the sixth embodiment from left to right.
  • the object side surface S1 of the first lens L1 is a convex surface at the near optical axis 110, and is a convex surface at the circumference;
  • the image side surface S2 of the first lens L1 is a concave surface at the near optical axis 110, and a convex surface at the circumference;
  • the object side surface S3 of the second lens L2 is a concave surface at the near optical axis 110, and a convex surface at the circumference;
  • the image side surface S4 of the second lens L2 is a convex surface at the near optical axis 110 and a concave surface at the circumference;
  • the object side surface S5 of the third lens L3 is a convex surface at the near optical axis 110 and a concave surface at the circumference;
  • the image side surface S6 of the third lens L3 is concave at the near optical axis 110 and convex at the circumference.
  • the object side surface and the image side surface of the first lens L1 , the second lens L2 and the third lens L3 are all aspherical surfaces.
  • the materials of the first lens L1 , the second lens L2 and the third lens L3 are all plastics.
  • the parameters of the optical system 100 are given in Table 11, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.
  • the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 12, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.
  • the optical system 100 can be assembled with the photosensitive element 210 to form the infrared receiving module 200 .
  • the photosensitive surface of the photosensitive element 210 can be regarded as the image surface S9 of the optical system 100 .
  • the infrared receiving module 200 may also be provided with an infrared bandpass filter L4, and the infrared bandpass filter L4 is disposed between the image side S6 and the image surface S9 of the third lens L3.
  • the photosensitive element 210 may be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor).
  • the photosensitive element 210 may be an infrared image sensor, and the infrared receiving module 200 is configured to receive infrared light and image the photosensitive element 210 .
  • the use of the above-mentioned optical system 100 in the infrared receiving module 200 is beneficial to increase the light transmission amount of the infrared receiving module 200 and at the same time is beneficial to the miniaturized design of the infrared receiving module 200 .
  • the infrared receiving module 200 can be used in an electronic device 300 , the electronic device includes a casing 310 , and the infrared receiving module 200 is disposed in the casing 310 .
  • the electronic device 300 may be, but is not limited to, a mobile phone, a video phone, a smart phone, an electronic book reader, a vehicle-mounted camera device such as a driving recorder, or a wearable device such as a smart watch.
  • the electronic device 300 can adopt TOF or LiDAR technology, and can be used in the fields of face unlocking, automatic driving of cars, human-machine interface and games, industrial machine vision and measurement, security monitoring imaging system, and the like.
  • the electronic device 300 further includes an emission module 320, and the emission module 320 is configured to emit infrared light, for example, infrared light in the wavelength range of 930nm-950nm can be emitted.
  • the electronic device 300 can be used to obtain the depth information of the object to be measured, and the infrared rays emitted by the transmitting module 320 are reflected by the object and then received by the infrared receiving module 200 .
  • the use of the infrared receiving module 200 in the electronic device 300 is beneficial to increase the amount of light passing through the electronic device 300 , and is also beneficial to the miniaturized design of the electronic device 300 .
  • first and second are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with “first”, “second” may expressly or implicitly include at least one of that feature.
  • plurality means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.
  • the terms “installed”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit.
  • installed may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit.
  • a first feature "on” or “under” a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch.
  • the first feature being “above”, “over” and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature.
  • the first feature being “below”, “below” and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

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Abstract

一种光学系统(200)包括：具有正屈折力的第一透镜(L1)，第一透镜(L1)的像侧面(S2)于近光轴(110)处为凹面；具有屈折力的第二透镜(L2)，第二透镜(L2)的物侧面(S3)于近光轴(110)处为凹面；具有屈折力的第三透镜(L3)，第三透镜(L3)的像侧面(S6)于近光轴(110)处为凹面；光学系统(200)满足条件式：1.4≤FNO≤1.8；0.8≤TT/f≤1.0；FNO为光学系统(200)的光圈数，TT为第一透镜(L1)的物侧面(S1)至第三透镜(L3)的像侧面(S6)于光轴(110)上的距离，f为光学系统(200)的有效焦距。光学系统(200)具备充足的通光量，也能够满足小型化设计的需求。

Description

光学系统、红外接收模组及电子设备 技术领域
本发明涉及红外探测领域，特别是涉及一种光学系统、红外接收模组及电子设备。
背景技术
随着飞行时间(Time of Flight，TOF)以及激光探测及测距系统(Light Detection and Ranging，LiDAR)等技术的飞速发展，红外光在人脸解锁、汽车自动驾驶、人机界面与游戏、工业机器视觉与测量、安防监控成像系统等领域的运用越来越广泛。由此，市场对用于接收红外光的光学系统的需求也越来越大，迫切需求具备足够通光量且能够满足小型化设计的光学系统。
发明内容
根据本申请的各种实施例，提供一种光学系统、红外接收模组及电子设备。
一种光学系统，沿光轴由物侧至像侧依次包括：
具有正屈折力的第一透镜，所述第一透镜的像侧面于近光轴处为凹面；
具有屈折力的第二透镜，所述第二透镜的物侧面于近光轴处为凹面；
具有屈折力的第三透镜，所述第三透镜的像侧面于近光轴处为凹面；
且所述光学系统满足以下条件式：
1.4≤FNO≤1.8；
0.8≤TT/f≤1.0；
其中，FNO为所述光学系统的光圈数，TT为所述第一透镜的物侧面至所述第三透镜的像侧面于光轴上的距离，f为所述光学系统的有效焦距。
一种红外接收模组，包括感光元件以及上述任一实施例所述的光学系统，所述感光元件设置于所述光学系统的像侧。
一种电子设备，包括壳体以及上述的红外接收模组，所述红外接收模组设置于所述壳体。
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和/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、目前描述的实施例和/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为本申请第一实施例中的光学系统的结构示意图；
图2为本申请第一实施例中的光学系统的纵向球差图、像散图及畸变图；
图3为本申请第二实施例中的光学系统的结构示意图；
图4为本申请第二实施例中的光学系统的纵向球差图、像散图及畸变图；
图5为本申请第三实施例中的光学系统的结构示意图；
图6为本申请第三实施例中的光学系统的纵向球差图、像散图及畸变图；
图7为本申请第四实施例中的光学系统的结构示意图；
图8为本申请第四实施例中的光学系统的纵向球差图、像散图及畸变图；
图9为本申请第五实施例中的光学系统的结构示意图；
图10为本申请第五实施例中的光学系统的纵向球差图、像散图及畸变图；
图11为本申请第六实施例中的光学系统的结构示意图；
图12为本申请第六实施例中的光学系统的纵向球差图、像散图及畸变图；
图13为本申请一实施例中的红外接收模组的示意图；
图14为本申请一实施例中的电子设备的示意图。
具体实施方式
为了便于理解本发明，下面将参照相关附图对本发明进行更全面的描述。附图中给出了本发明的较佳实施方式。但是，本发明可以以许多不同的形式来实现，并不限于本文所描述的实施方式。相反地，提供这些实施方式的目的是使对本发明的公开内容理解的更加透彻全面。
需要说明的是，当元件被称为“固定于”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“内”、“外”、“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。
请参见图1，在本申请的一些实施例中，光学系统100由物侧到像侧依次包括第一透镜L1、第二透镜L2以及第三透镜L3。具体地，第一透镜L1包括物侧面S1及像侧面S2，第二透镜L2包括物侧面S3及像侧面S4，第三透镜L3包括物侧面S5及像侧面S6。
其中，第一透镜L1具有正屈折力，有利于缩短光学系统100的系统总长，以满足小型化设计的需求。第一透镜L1的像侧面S2于近光轴110处为凹面，有利于光线的发散与偏折，可减小第一透镜L1像方各透镜承担的偏折角，从而有利于平衡光线在各个透镜的偏折角。第二透镜L2及第三透镜L3均具有屈折力。第二透镜L2的物侧面S3于近光轴110处为凹面，有利于校正光学系统100的场曲和像散，从而提升光学系统100的成像质量。第三透镜L3的像侧面S6于近光轴110处为凹面，有利于改善光学系统100的场曲像差。
在一些实施例中，第三透镜L3的物侧面S5及像侧面S6均为非球面，有利于提高第三透镜L3设计的灵活性，并有效地校正光学系统100的球差，改善成像质量。在一些实施例中，第三透镜L3的物侧面S5与像侧面S6中的至少一者存在反曲点，有利于修正立轴视场的像差，进一步提升光学系统100的成像质量。
在一些实施例中，第二透镜L2及第三透镜L3均具有正屈折力，有利于光线的汇聚，从而有利于缩短光学系统100的系统总长，进一步满足小型化设计的要求。在另一些实施例中，第二透镜L2具有正屈折力，第三透镜L3具有负屈折力时，与第一透镜L1的正屈折力配合，能够平衡系统总长与视场角，在缩短系统总长的同时也有利于扩大光学系统100的视场角。
另外，在一些实施例中，光学系统100设置有光阑STO，光阑STO可设置于第一透镜L1的物侧，或设置于第一透镜L1的物侧面上。在一些实施例中，光学系统100还包括设置于第三透镜L3像侧的红外带通滤光片L4，红外带通滤光片L4包括物侧面S7及像侧面S8。进一步地，光学系统100还包括位于第三透镜L3像侧的像面S9，像面S9即为光学系统100的成像面，入射光经第一透镜L1、第二透镜L2以及第三透镜L3调节后能够成像于像面S9。可以理解的是，红外带通滤光片L4，用于供红外光透过，例如，在一些实施例中，红外带通滤光片L4可允许930nm-950nm的红外光通过。因而，在一些实施例中，光学系统100可用于接收红外光，具体可运用于TOF、LiDAR等运用红外光探测的技术中。具体地，光学系统100可用于人脸解锁、汽车自动驾驶、人机界面与游戏、工业机器视觉与测量、安防监控成像系统等领域，以满足接收红外光的需求。
在一些实施例中，光学系统100的各透镜的物侧面和像侧面均为非球面。非球面结构的采用能够提高透镜设计的灵活性，并有效地校正球差，改善成像质量。在另一些实施例中，光学系统100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，光学系统100中各透镜的表面可以是非球面或球面的任意组合。
在一些实施例中，光学系统100中的各透镜的材质可以均为玻璃或均为塑料。采用塑料材质的透镜能够减少光学系统100的重量并降低生产成本，配合光学系统的较小尺寸以实现光学系统的轻薄化设计。而采用玻璃材质的透镜使光学系统100具备优良的光学性能以及较高的耐温性能。需要注意的是，光学系统100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。
需要注意的是，第一透镜L1并不意味着只存在一片透镜，在一些实施例中，第一透镜L1中也可以存在两片或多片透镜，两片或多片透镜能够形成胶合透镜，胶合透镜最靠近物侧的表面可视为物侧面S1，最靠近像侧的表面可视为像侧面S2。或者，第一透镜L1中的各透镜之间并不形成胶合透镜，但各透镜之间的距离相对固定，此时最靠近物侧的透镜的物侧面为物侧面S1，最靠近像侧的透镜的像侧面为像侧面S2。另外，一些实施例中的第二透镜L2或第三透镜L3中的透镜数量也可大于或等于两片，且任意相邻透镜之间可以形成胶合透镜，也可以为非胶合透镜。
进一步地，在一些实施例中，光学系统100满足条件式：1.4≤FNO≤1.8；其中，FNO为光学系统100的光圈数。具体地，FNO可以为：1.4、1.42、1.46、1.48、1.50、1.51、1.55、1.58、1.62或1.76。满足上述条件式时，能够增大光学系统100的通光量，使得光学系统100在弱光环境下也能够获取被摄物清晰的细节信息，同时提升边缘视场的亮度，从而提升光学系统100的成像质量。
在一些实施例中，光学系统100满足条件式：0.8≤TT/f≤1.0；其中，TT为第一透镜L1的物侧面S1至第三透镜L3的像侧面S6于光轴110上的距离，f为光学系统100的有效焦距。具体地，TT/f可以为：0.855、0.864、0.877、0.896、0.915、0.926、0.955、0.967、0.971或0.992。满足上述条件式时，能够对TT以及光学系统100的有效焦距的比值进行合理配置，有利于缩短光学系统100的系统总长，实现小型化设计，同时也有利于光线更好地汇聚于光学系统100的成像面上。
在一些实施例中，光学系统100满足条件式：0.6≤tan(HFOV)*(SD32/IMGH)≤1.1；其中，HFOV为光学系统100的最大视场角的一半，SD32为第三透镜L3的像侧面S6的最大有效半孔径，IMGH为光学系统100的最大视场角对应的像高的一半。具体地，tan(HFOV)*(SD32/IMGH)可以为：0.636、0.673、0.710、0.725、0.788、0.843、0.852、0.901、0.963或1。满足上述条件式时，能够对光学系统100的视场角、第三透镜L3的像侧面S6的最大有效半孔径以及光学系统100的半像高进行合理配置，使得光学系统100在大视场角与小型化设计中取得平衡，在实现小型化设计的同时也有利于增大光学系统100的视场角；另外，还有利于增大光学系统100拍摄成像的焦深，从而有利于对物体立体轮廓信息的获取。低于上述条件式的下限，在实现小型化设计的同时不利于扩大光学系统100的视场角，从而不利于光学系统100对大视场范围内的物体成像拥有层次感。超过上述条件式的上限，光学系统100的视场角过大，使得光学系统100的畸变像差校正困难，从而导致成像不清晰、图像严重变形的情况。
需要说明的是，在一些实施例中，光学系统100可以匹配具有矩形感光面的感光元件，光学系统100的成像面与感光元件的感光面重合。此时，光学系统100成像面上有效像素区域具有水平方向以及对角线方向，则HFOV可以理解为光学系统100对角线方向的最大视场角的一半，ImgH可以理解为光学系统100成像面上有效像素区域对角线方向的长度的一半。
在一些实施例中，光学系统100满足条件式：0.10mm≤T12+T23≤1.1mm；其中，T12为第一透镜L1的像侧面S2至第二透镜L2的物侧面S3于光轴110上的距离，T23为第二透镜L2的像侧面S4至第三透镜L3的物侧面S5于光轴110上的距离。具体地，T12+T23可以为：0.179、0.252、0.367、0.412、0.557、0.623、0.771、0.823、0.996或1.065，数值单位为mm。满足上述条件式时，能够对光学系统100相邻两透镜之间的间距进行合理配置，从而进一步缩短光学系统100的系统总长，有利于光学系统100的小型化设计。低于上述条件式的下限，相邻两透镜之间的间隔过小，导致光学系统100的敏感度增大，不利于光学系统100的组装。超过上述条件式的上限，相邻两透镜之间的间隔过大，相邻两透镜之间需要额外的隔片组件等连接元件连接，增加了光学系统100的成本，同时不利于光学系统100的小型化设计。
在一些实施例中，光学系统100满足条件式：1.0≤f1/f≤18.0；其中，f1为第一透镜 L1的有效焦距。具体地，f1/f可以为：1.34、2.01、3.25、5.36、7.15、8.33、10.21、12.07、15.15或16.22。满足上述条件式时，能够对第一透镜L1的有效焦距以及光学系统100的有效焦距的比值进行合理配置，使得第一透镜L1为光学系统100提供足够的正屈折力，有利于光线的汇聚。当超过上述条件式的上限，第一透镜L1为光学系统100提供的正屈折力不足，导致光学系统100的光线收集能力下降。低于上述条件式的下限，第一透镜L1提供为光学系统100提供的正屈折力过大，不利于第二透镜L2及第三透镜L3整体对第一透镜L1产生的像差的校正，进而降低光学系统100的成像质量，同时，第一透镜L1的面型过度弯曲，不利于第一透镜L1的成型，从而降低第一透镜L1的制造良率。
在一些实施例中，光学系统100满足条件式：-45≤R3/CT2≤-1；其中，R3为第二透镜L2的物侧面S3于光轴110处的曲率半径，CT2为第二透镜L2于光轴110上的厚度。具体地，R3/CT2可以为：-40、-32.01、-21.65、-11.33、-9.54、-8.03、-6.52、-5.36、-3.99或-2.14。满足上述条件式时，能够对第二透镜L2的物侧面S3于光轴100处的曲率半径及第二透镜L2的中心厚度的比值进行合理配置，使得第二透镜L2能够有效修正光学系统100的场曲及像散，提升光学系统100的成像质量。低于上述条件式的下限，第二透镜L2的面型过于平缓，不利于校正光学系统100的场曲及像散。超过上述条件式的上限，第二透镜L2的物侧面S3于靠近最大有效孔径处容易出现过度反曲现象，导致光学系统100的杂散光增多，从而降低光学系统100的成像质量。
在一些实施例中，光学系统100满足条件式：0.80mm≤FFL≤1.05mm；其中，FFL为第三透镜L3的像侧面S6至光学系统100的成像面于光轴110方向上的最短距离。具体地，FFL可以为：0.84、0.86、0.87、0.89、0.91、0.93、0.95、0.97、1.01或1.03，数值单位为mm。超过上述条件式的下限，有利于使得光学系统100在组装时有足够的组装和调试空间，从而提升光学系统100的组装良率；同时，也有利于增大光学系统100的焦深，以使光学系统100能够获取物方更多的深度信息。低于上述条件式的上限，有利于压缩光学系统100的轴向尺寸，从而有利于光学系统100的小型化设计。
在一些实施例中，光学系统100满足条件式：0.9≤f23/f≤2.5；其中，f23为第二透镜L2与第三透镜L3的组合焦距。具体地，f23/f可以为：0.975、1.325、1.561、1.685、1.703、1.872、1.963、2.015、2.225或2.313。满足上述条件式时，能够对第二透镜L2与第三透镜L3的组合焦距以及光学系统100的有效焦距的比值进行合理配置，有利于缩短光学系统100的系统总长，同时也能够避免光学系统100的高阶球差过度增大，从而有利于提升光学系统100的成像质量。超过上述条件式的上限，第二透镜L2与第三透镜L3的组合焦距过大，在校正光学系统100的球差的同时，不利于缩短光学系统100的系统总长。低于上述条件式的下限，第二透镜L2与第三透镜L3的组合焦距过小，则第二透镜L2与第三透镜L3整体的屈折力过强，容易造成球差的过度校正，从而导致光学系统100成像质量下降。
在一些实施例中，光学系统100满足条件式：1.2≤(R2+R1)/(R2-R1)≤50；其中，R1为第一透镜L1的物侧面S1于光轴110处的曲率半径，R2为第一透镜L1的像侧面S2于光轴110处的曲率半径。具体地，(R2+R1)/(R2-R1)可以为：1.575、1.785、1.993、2.052、2.133、2.287、10.637、19.852、30.647或47.328。满足上述条件式时，能够对第一透镜L1的物侧面S1及像侧面S2于光轴110处的曲率半径进行合理配置，配合第一透镜L1的像侧面S2于近光轴110处的面型，能够合理分配第一透镜L1承担的光学偏折角，从而有利于扩大光学系统100的最大视场角；同时也有利于修正轴外视场的像散，进而提升光学系统100的成像质量。
根据上述各实施例的描述，以下提出更为具体的实施例及附图予以详细说明。
第一实施例
请参见图1和图2，图1为第一实施例中的光学系统100的结构示意图，光学系统100由物侧至像侧依次包括光阑STO、具有正屈折力的第一透镜L1、具有负屈折力的第二透镜L2以及具有正屈折力的第三透镜L3。图2由左至右依次为第一实施例中光学系统100的纵向球 差、像散及畸变的曲线图，其中像散图和畸变图的参考波长为940nm，其他实施例相同。
第一透镜L1的物侧面S1于近光轴110处为凸面，于圆周处为凸面；
第一透镜L1的像侧面S2于近光轴110处为凹面，于圆周处为凹面；
第二透镜L2的物侧面S3于近光轴110处为凹面，于圆周处为凹面；
第二透镜L2的像侧面S4于近光轴110处为凹面，于圆周处为凸面；
第三透镜L3的物侧面S5于近光轴110处为凸面，于圆周处为凹面；
第三透镜L3的像侧面S6于近光轴110处为凹面，于圆周处为凸面。
第一透镜L1、第二透镜L2以及第三透镜L3的物侧面和像侧面均为非球面。
需要注意的是，在本申请中，当描述透镜的一个表面于近光轴110处(该表面的中心区域)为凸面时，可理解为该透镜的该表面于光轴110附近的区域为凸面。当描述透镜的一个表面于圆周处为凹面时，可理解为该表面在靠近最大有效半径处的区域为凹面。举例而言，当该表面于近光轴110处为凸面，且于圆周处也为凸面时，该表面由中心(该表面与光轴110的交点)至边缘方向的形状可以为纯粹的凸面；或者是先由中心的凸面形状过渡到凹面形状，随后在靠近最大有效半径处时变为凸面。此处仅为说明光轴110处与圆周处的关系而做出的示例，表面的多种形状结构(凹凸关系)并未完全体现，但其他情况可根据以上示例推导得出。
第一透镜L1、第二透镜L2以及第三透镜L3的材质均为塑料。
进一步地，光学系统100满足条件式：FNO＝1.4；其中，FNO为光学系统100的光圈数。满足上述条件式时，能够增大光学系统100的通光量，使得光学系统100在弱光环境下也能够获取被摄物清晰的细节信息，同时提升边缘视场的亮度，从而提升光学系统100的成像质量。
光学系统100满足条件式：TT/f＝0.968；其中，TT为第一透镜L1的物侧面S1至第三透镜L3的像侧面S6于光轴110上的距离，f为光学系统100的有效焦距。满足上述条件式时，能够对TT以及光学系统100的有效焦距的比值进行合理配置，有利于缩短光学系统100的系统总长，实现小型化设计，同时也有利于光线更好地汇聚于光学系统100的成像面上。
光学系统100满足条件式：tan(HFOV)*(SD32/IMGH)＝0.7；其中，HFOV为光学系统100的最大视场角的一半，SD32为第三透镜L3的像侧面S6的最大有效半孔径，IMGH为光学系统100的最大视场角对应的像高的一半。满足上述条件式时，能够对光学系统100的视场角、第三透镜L3的像侧面S6的最大有效半孔径以及光学系统100的半像高进行合理配置，使得光学系统100在大视场角与小型化设计中取得平衡，在实现小型化设计的同时也有利于增大光学系统100的视场角；另外，还有利于增大光学系统100拍摄成像的焦深，从而有利于对物体立体轮廓信息的获取；再者，还有利于光学系统100的畸变像差的校正，从而避免成像不清晰、图像严重变形的情况。
光学系统100满足条件式：T12+T23＝1.065mm；其中，T12为第一透镜L1的像侧面S2至第二透镜L2的物侧面S3于光轴110上的距离，T23为第二透镜L2的像侧面S4至第三透镜L3的物侧面S5于光轴110上的距离。满足上述条件式时，能够对光学系统100相邻两透镜之间的间距进行合理配置，从而进一步缩短光学系统100的系统总长，有利于光学系统100的小型化设计；同时也有利于降低光学系统100的敏感度，从而有利于光学系统100的组装；另外，还能够降低光学系统100的成本。
光学系统100满足条件式：f1/f＝1.41；其中，f1为第一透镜L1的有效焦距。满足上述条件式时，能够对第一透镜L1的有效焦距以及光学系统100的有效焦距的比值进行合理配置，使得第一透镜L1为光学系统100提供足够的正屈折力，有利于光线的汇聚；另外，第一透镜L1提供为光学系统100提供的正屈折力也不会过大，有利于第二透镜L2及第三透镜L3整体对第一透镜L1产生的像差的校正，进而提升光学系统100的成像质量；同时，第一透镜L1的面型也不会过度弯曲，有利于第一透镜L1的成型，从而提升第一透镜L1的制造良率。
光学系统100满足条件式：R3/CT2＝-9.03；其中，R3为第二透镜L2的物侧面S3于光轴 110处的曲率半径，CT2为第二透镜L2于光轴110上的厚度。满足上述条件式时，能够对第二透镜L2的物侧面S3于光轴100处的曲率半径及第二透镜L2的中心厚度的比值进行合理配置，使得第二透镜L2能够有效修正光学系统100的场曲及像散，同时，也能够减少光学系统100的杂散光，从而提升光学系统100的成像质量。
光学系统100满足条件式：FFL＝0.94mm；其中，FFL为第三透镜L3的像侧面S6至光学系统100的成像面于光轴110方向上的最短距离。超过上述条件式的下限，有利于使得光学系统100在组装时有足够的组装和调试空间，从而提升光学系统100的组装良率；同时，也有利于增大光学系统100的焦深，以使光学系统100能够获取物方更多的深度信息。低于上述条件式的上限，有利于压缩光学系统100的轴向尺寸，从而有利于光学系统100的小型化设计。
光学系统100满足条件式：f23/f＝2.313；其中，f23为第二透镜L2与第三透镜L3的组合焦距。满足上述条件式时，能够对第二透镜L2与第三透镜L3的组合焦距以及光学系统100的有效焦距的比值进行合理配置，有利于缩短光学系统100的系统总长，同时也能够避免光学系统100的高阶球差过度增大，从而有利于提升光学系统100的成像质量。
光学系统100满足条件式：(R2+R1)/(R2-R1)＝1.877；其中，R1为第一透镜L1的物侧面S1于光轴110处的曲率半径，R2为第一透镜L1的像侧面S2于光轴110处的曲率半径。满足上述条件式时，能够对第一透镜L1的物侧面S1及像侧面S2于光轴110处的曲率半径进行合理配置，配合第一透镜L1的像侧面S2于近光轴110处的面型，能够合理分配第一透镜L1承担的光学偏折角，从而有利于扩大光学系统100的最大视场角；同时也有利于修正轴外视场的像散，进而提升光学系统100的成像质量。
另外，光学系统100的各项参数由表1给出。其中，表1中的像面S9可理解为光学系统100的成像面。由物面(图未示出)至像面S9的各元件依次按照表1从上至下的各元件的顺序排列。表1中的Y半径为相应面序号的物侧面或像侧面于光轴110处的曲率半径。面序号S1和面序号S2分别为第一透镜L1的物侧面S1和像侧面S2，即同一透镜中，面序号较小的表面为物侧面，面序号较大的表面为像侧面。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110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于光轴110上的距离。
需要注意的是，在该实施例及以下各实施例中，光学系统100也可不设置红外带通滤光片L4，但此时第三透镜L3的像侧面S6至像面S9的距离保持不变。
在第一实施例中，光学系统100的有效焦距f＝2.87mm，光圈数FNO＝1.40，最大视场角的一半HFOV＝39.7°，光学总长TTL＝3.98mm。
且各透镜的焦距的参考波长为940nm，各透镜的折射率和阿贝数的参考波长均为587.56nm，其他实施例也相同。
表1
Figure PCTCN2021079257-appb-000001
Figure PCTCN2021079257-appb-000002
进一步地，光学系统100各透镜像侧面或物侧面的非球面系数由表2给出。其中，面序号从S1-S6分别表示像侧面或物侧面S1-S6。而从上到下的K-A20分别表示非球面系数的类型，其中，K表示圆锥系数，A4表示四次非球面系数，A6表示六次非球面系数，A8表示八次非球面系数，以此类推。另外，非球面系数公式如下：
Figure PCTCN2021079257-appb-000003
其中，Z为非球面上相应点到与表面顶点相切的平面的距离，r为非球面上相应点到光轴110的距离，c为非球面顶点的曲率，k为圆锥系数，Ai为非球面面型公式中与第i项高次项相对应的系数。
表2
Figure PCTCN2021079257-appb-000004
另外，图2包括光学系统100的纵向球面像差图(Longitudinal Spherical Aberration)，其表示不同波长的光线经由镜头后的汇聚焦点偏离。纵向球面像差图的纵坐标表示归一化的由光瞳中心至光瞳边缘的光瞳坐标(Normalized Pupil Coordinator)，横坐标表示成像面到光线与光轴110交点的距离(单位为mm)。由纵向球面像差图可知，第一实施例中的各波长光线的汇聚焦点偏离程度趋于一致，成像画面中的弥散斑或色晕得到有效抑制。图2还包括光学系统100的场曲图(ASTIGMATIC FIELD CURVES)，其中S曲线代表940nm下的弧矢场曲，T曲线代表940nm下的子午场曲。由图中可知，光学系统100的场曲较小，各视场的场曲和像散均得到了良好的校正，视场中心和边缘均拥有清晰的成像。图2还包括光学系统100的畸变图(DISTORTION)，由图中可知，由主光束引起的图像变形较小，系统的成像质量优良。
第二实施例
请参见图3和图4，图3为第二实施例中的光学系统100的结构示意图，光学系统100由物侧至像侧依次包括光阑STO、具有正屈折力的第一透镜L1、具有负屈折力的第二透镜L2以及具有正屈折力的第三透镜L3。图2由左至右依次为第二实施例中光学系统100的纵向球差、像散及畸变的曲线图。
第一透镜L1的物侧面S1于近光轴110处为凸面，于圆周处为凸面；
第一透镜L1的像侧面S2于近光轴110处为凹面，于圆周处为凹面；
第二透镜L2的物侧面S3于近光轴110处为凹面，于圆周处为凹面；
第二透镜L2的像侧面S4于近光轴110处为凹面，于圆周处为凸面；
第三透镜L3的物侧面S5于近光轴110处为凸面，于圆周处为凸面；
第三透镜L3的像侧面S6于近光轴110处为凹面，于圆周处为凸面。
第一透镜L1、第二透镜L2以及第三透镜L3的物侧面和像侧面均为非球面。
第一透镜L1、第二透镜L2以及第三透镜L3的材质均为塑料。
另外，光学系统100的各项参数由表3给出，且其中各参数的定义可由第一实施例得出，此处不加以赘述。
表3
Figure PCTCN2021079257-appb-000005
进一步地，光学系统100各透镜像侧面或物侧面的非球面系数由表4给出，且其中各参数的定义可由第一实施例得出，此处不加以赘述。
表4
Figure PCTCN2021079257-appb-000006
并且，根据上述所提供的各参数信息，可推得以下数据：
FNO 1.650 R3/CT2 -40.000
TT/f 0.992 FFL 0.840mm
T12+T23 0.470mm f23/f 1.397
tan(HFOV)*(SD32/IMGH) 0.787 (R2+R1)/(R2-R1) 2.225
f1/f 2.070    
另外，由图4中的像差图可知，光学系统100的纵向球差、场曲和畸变均得到良好的控 制，从而该实施例的光学系统100拥有良好的成像品质。
第三实施例
请参见图5和图6，图5为第三实施例中的光学系统100的结构示意图，光学系统100由物侧至像侧依次包括光阑STO、具有正屈折力的第一透镜L1、具有正屈折力的第二透镜L2以及具有正屈折力的第三透镜L3。图6由左至右依次为第三实施例中光学系统100的纵向球差、像散及畸变的曲线图。
第一透镜L1的物侧面S1于近光轴110处为凸面，于圆周处为凸面；
第一透镜L1的像侧面S2于近光轴110处为凹面，于圆周处为凹面；
第二透镜L2的物侧面S3于近光轴110处为凹面，于圆周处为凹面；
第二透镜L2的像侧面S4于近光轴110处为凸面，于圆周处为凸面；
第三透镜L3的物侧面S5于近光轴110处为凸面，于圆周处为凹面；
第三透镜L3的像侧面S6于近光轴110处为凹面，于圆周处为凸面。
第一透镜L1、第二透镜L2以及第三透镜L3的物侧面和像侧面均为非球面。
第一透镜L1、第二透镜L2以及第三透镜L3的材质均为塑料。
另外，光学系统100的各项参数由表5给出，且其中各参数的定义可由第一实施例得出，此处不加以赘述。
表5
Figure PCTCN2021079257-appb-000007
进一步地，光学系统100各透镜像侧面或物侧面的非球面系数由表6给出，且其中各参数的定义可由第一实施例得出，此处不加以赘述。
表6
Figure PCTCN2021079257-appb-000008
Figure PCTCN2021079257-appb-000009
并且，根据上述所提供的各参数信息，可推得以下数据：
FNO 1.760 R3/CT2 -2.140
TT/f 0.855 FFL 0.950mm
T12+T23 0.395mm f23/f 2.010
tan(HFOV)*(SD32/IMGH) 0.636 (R2+R1)/(R2-R1) 1.575
f1/f 1.340    
另外，由图6中的像差图可知，光学系统100的纵向球差、场曲和畸变均得到良好的控制，从而该实施例的光学系统100拥有良好的成像品质。
第四实施例
请参见图7和图8，图7为第四实施例中的光学系统100的结构示意图，光学系统100由物侧至像侧依次包括光阑STO、具有正屈折力的第一透镜L1、具有正屈折力的第二透镜L2以及具有负屈折力的第三透镜L3。图8由左至右依次为第四实施例中光学系统100的纵向球差、像散及畸变的曲线图。
第一透镜L1的物侧面S1于近光轴110处为凸面，于圆周处为凹面；
第一透镜L1的像侧面S2于近光轴110处为凹面，于圆周处为凸面；
第二透镜L2的物侧面S3于近光轴110处为凹面，于圆周处为凹面；
第二透镜L2的像侧面S4于近光轴110处为凸面，于圆周处为凸面；
第三透镜L3的物侧面S5于近光轴110处为凸面，于圆周处为凸面；
第三透镜L3的像侧面S6于近光轴110处为凹面，于圆周处为凸面。
第一透镜L1、第二透镜L2以及第三透镜L3的物侧面和像侧面均为非球面。
第一透镜L1、第二透镜L2以及第三透镜L3的材质均为塑料。
另外，光学系统100的各项参数由表7给出，且其中各参数的定义可由第一实施例得出，此处不加以赘述。
表7
Figure PCTCN2021079257-appb-000010
进一步地，光学系统100各透镜像侧面或物侧面的非球面系数由表8给出，且其中各参数的定义可由第一实施例得出，此处不加以赘述。
表8
Figure PCTCN2021079257-appb-000011
并且，根据上述所提供的各参数信息，可推得以下数据：
FNO 1.650 R3/CT2 -7.290
TT/f 0.874 FFL 1.030mm
T12+T23 0.230mm f23/f 0.975
tan(HFOV)*(SD32/IMGH) 0.761 (R2+R1)/(R2-R1) 47.328
f1/f 16.220    
另外，由图8中的像差图可知，光学系统100的纵向球差、场曲和畸变均得到良好的控制，从而该实施例的光学系统100拥有良好的成像品质。
第五实施例
请参见图9和图10，图9为第五实施例中的光学系统100的结构示意图，光学系统100由物侧至像侧依次包括光阑STO、具有正屈折力的第一透镜L1、具有正屈折力的第二透镜L2以及具有负屈折力的第三透镜L3。图10由左至右依次为第五实施例中光学系统100的纵向球差、像散及畸变的曲线图。
第一透镜L1的物侧面S1于近光轴110处为凸面，于圆周处为凸面；
第一透镜L1的像侧面S2于近光轴110处为凹面，于圆周处为凸面；
第二透镜L2的物侧面S3于近光轴110处为凹面，于圆周处为凸面；
第二透镜L2的像侧面S4于近光轴110处为凸面，于圆周处为凹面；
第三透镜L3的物侧面S5于近光轴110处为凸面，于圆周处为凹面；
第三透镜L3的像侧面S6于近光轴110处为凹面，于圆周处为凸面。
第一透镜L1、第二透镜L2以及第三透镜L3的物侧面和像侧面均为非球面。
第一透镜L1、第二透镜L2以及第三透镜L3的材质均为塑料。
另外，光学系统100的各项参数由表9给出，且其中各参数的定义可由第一实施例得出，此处不加以赘述。
表9
Figure PCTCN2021079257-appb-000012
Figure PCTCN2021079257-appb-000013
进一步地，光学系统100各透镜像侧面或物侧面的非球面系数由表10给出，且其中各参数的定义可由第一实施例得出，此处不加以赘述。
表10
Figure PCTCN2021079257-appb-000014
并且，根据上述所提供的各参数信息，可推得以下数据：
FNO 1.650 R3/CT2 -3.210
TT/f 0.948 FFL 0.840mm
T12+T23 0.206mm f23/f 1.463
tan(HFOV)*(SD32/IMGH) 1.000 (R2+R1)/(R2-R1) 1.790
f1/f 2.120    
另外，由图10中的像差图可知，光学系统100的纵向球差、场曲和畸变均得到良好的控制，从而该实施例的光学系统100拥有良好的成像品质。
第六实施例
请参见图11和图12，图11为第六实施例中的光学系统100的结构示意图，光学系统100由物侧至像侧依次包括光阑STO、具有正屈折力的第一透镜L1、具有正屈折力的第二透镜L2以及具有负屈折力的第三透镜L3。图12由左至右依次为第六实施例中光学系统100的纵向球差、像散及畸变的曲线图。
第一透镜L1的物侧面S1于近光轴110处为凸面，于圆周处为凸面；
第一透镜L1的像侧面S2于近光轴110处为凹面，于圆周处为凸面；
第二透镜L2的物侧面S3于近光轴110处为凹面，于圆周处为凸面；
第二透镜L2的像侧面S4于近光轴110处为凸面，于圆周处为凹面；
第三透镜L3的物侧面S5于近光轴110处为凸面，于圆周处为凹面；
第三透镜L3的像侧面S6于近光轴110处为凹面，于圆周处为凸面。
第一透镜L1、第二透镜L2以及第三透镜L3的物侧面和像侧面均为非球面。
第一透镜L1、第二透镜L2以及第三透镜L3的材质均为塑料。
另外，光学系统100的各项参数由表11给出，且其中各参数的定义可由第一实施例得 出，此处不加以赘述。
表11
Figure PCTCN2021079257-appb-000015
进一步地，光学系统100各透镜像侧面或物侧面的非球面系数由表12给出，且其中各参数的定义可由第一实施例得出，此处不加以赘述。
表12
Figure PCTCN2021079257-appb-000016
并且，根据上述所提供的各参数信息，可推得以下数据：
FNO 1.650 R3/CT2 -3.010
TT/f 0.930 FFL 0.950
T12+T23 0.179mm f23/f 1.472
tan(HFOV)*(SD32/IMGH) 0.802 (R2+R1)/(R2-R1) 2.093
f1/f 2.050    
另外，由图12中的像差图可知，光学系统100的纵向球差、场曲和畸变均得到良好的控制，从而该实施例的光学系统100拥有良好的成像品质。
请参见图13，在一些实施例中，光学系统100可与感光元件210组装形成红外接收模组200。此时，感光元件210的感光面可视为光学系统100的像面S9。红外接收模组200还可设置有红外带通滤光片L4，红外带通滤光片L4设置于第三透镜L3的像侧面S6与像面S9之间。具体地，感光元件210可以为电荷耦合元件(Charge Coupled Device，CCD)或互补金属 氧化物半导体器件(Complementary Metal-Oxide Semiconductor Sensor，CMOS Sensor)。更具体地，感光元件210可以为红外线图像传感器，红外接收模组200用于接收红外光，并成像于感光元件210上。在红外接收模组200中采用上述光学系统100，有利于增大红外接收模组200的通光量，同时有利于红外接收模组200的小型化设计。
请参见图13和图14，在一些实施例中，红外接收模组200可运用于电子设备300中，电子设备包括壳体310，红外接收模组200设置于壳体310。具体地，电子设备300可以为但不限于便携电话机、视频电话、智能手机、电子书籍阅读器、行车记录仪等车载摄像设备或智能手表等可穿戴装置。另外，电子设备300可采用TOF或LiDAR技术，且可运用于人脸解锁、汽车自动驾驶、人机界面与游戏、工业机器视觉与测量、安防监控成像系统等领域。在一些实施例中，电子设备300还包括发射模组320，发射模组320用于发射红外线，例如可以发射930nm-950nm波长范围内的红外光。例如，当电子设备300采用TOF技术时，电子设备300可用于获取被测物的深度信息，则发射模组320发射的红外线经被摄物反射后被红外接收模组200接收。在电子设备300中采用红外接收模组200，有利于增大电子设备300的通光量，同时有利于电子设备300的小型化设计。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
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 (20)

  1. 一种光学系统，沿光轴由物侧至像侧依次包括：
    具有正屈折力的第一透镜，所述第一透镜的像侧面于近光轴处为凹面；
    具有屈折力的第二透镜，所述第二透镜的物侧面于近光轴处为凹面；
    具有屈折力的第三透镜，所述第三透镜的像侧面于近光轴处为凹面；
    且所述光学系统满足以下条件式：
    1.4≤FNO≤1.8；
    0.8≤TT/f≤1.0；
    其中，FNO为所述光学系统的光圈数，TT为所述第一透镜的物侧面至所述第三透镜的像侧面于光轴上的距离，f为所述光学系统的有效焦距。
  2. 根据权利要求1所述的光学系统，其特征在于，满足以下条件式：
    0.6≤tan(HFOV)*(SD32/IMGH)≤1.1；
    其中，HFOV为所述光学系统的最大视场角的一半，SD32为所述第三透镜的像侧面的最大有效半孔径，IMGH为所述光学系统的最大视场角对应的像高的一半。
  3. 根据权利要求1所述的光学系统，其特征在于，满足以下条件式：
    0.10mm≤T12+T23≤1.1mm；
    其中，T12为所述第一透镜的像侧面至所述第二透镜的物侧面于光轴上的距离，T23为所述第二透镜的像侧面至所述第三透镜的物侧面于光轴上的距离。
  4. 根据权利要求1所述的光学系统，其特征在于，满足以下条件式：
    1.0≤f1/f≤18.0；
    其中，f1为所述第一透镜的有效焦距。
  5. 根据权利要求1所述的光学系统，其特征在于，满足以下条件式：
    -45≤R3/CT2≤-1；
    其中，R3为所述第二透镜的物侧面于光轴处的曲率半径，CT2为所述第二透镜于光轴上的厚度。
  6. 根据权利要求1所述的光学系统，其特征在于，满足以下条件式：
    0.80mm≤FFL≤1.05mm；
    其中，FFL为所述第三透镜的像侧面至所述光学系统的成像面于光轴方向上的最短距离。
  7. 根据权利要求1所述的光学系统，其特征在于，满足以下条件式：
    0.9≤f23/f≤2.5；
    其中，f23为所述第二透镜与所述第三透镜的组合焦距。
  8. 根据权利要求1所述的光学系统，其特征在于，满足以下条件式：
    1.2≤(R2+R1)/(R2-R1)≤50；
    其中，R1为所述第一透镜的物侧面于光轴处的曲率半径，R2为所述第一透镜的像侧面于光轴处的曲率半径。
  9. 根据权利要求1-8任一项所述的光学系统，其特征在于，所述第三透镜的物侧面及像侧面均为非球面。
  10. 根据权利要求9所述的光学系统，其特征在于，所述光学系统的各透镜的物侧面和像侧面均为非球面。
  11. 根据权利要求1-8任一项所述的光学系统，其特征在于，所述第三透镜的物侧面于像侧面中的至少一者存在反曲点。
  12. 根据权利要求1-8任一项所述的光学系统，其特征在于，所述第二透镜及所述第三透镜均具有正屈折力。
  13. 根据权利要求1-8任一项所述的光学系统，其特征在于，所述第二透镜具有正屈折力，所述第三透镜具有负屈折力。
  14. 根据权利要求1-8任一项所述的光学系统，其特征在于，所述光学系统设置有光阑， 所述光阑设置于所述第一透镜的物侧，或者所述光阑设置于所述第一透镜的物侧面上。
  15. 根据权利要求1-8任一项所述的光学系统，其特征在于，还包括红外带通滤光片，所述红外带通滤光片设置于所第三透镜的像侧。
  16. 根据权利要求15所述的光学系统，其特征在于，所述红外带通滤光片允许930nm-950nm的红外光通过。
  17. 根据权利要求1-8任一项所述的光学系统，其特征在于，所述光学系统的各透镜的材质均为玻璃或均为塑料。
  18. 一种红外接收模组，包括感光元件以及权利要求1-17任一项所述的光学系统，所述感光元件设置于所述光学系统的像侧。
  19. 一种电子设备，包括壳体以及权利要求18所述的红外接收模组，所述红外接收模组设置于所述壳体。
  20. 根据权利要求19所述的电子设备，其特征在于，还包括发射模组，所述发射模组用于发射红外线，所述发射模组发射的红外线经被摄物反射后被所述红外接收模组接收。
PCT/CN2021/079257 2021-03-05 2021-03-05 光学系统、红外接收模组及电子设备 WO2022183473A1 (zh)

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