WO2019210736A1 - Lentille de projection - Google Patents

Lentille de projection Download PDF

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Publication number
WO2019210736A1
WO2019210736A1 PCT/CN2019/076959 CN2019076959W WO2019210736A1 WO 2019210736 A1 WO2019210736 A1 WO 2019210736A1 CN 2019076959 W CN2019076959 W CN 2019076959W WO 2019210736 A1 WO2019210736 A1 WO 2019210736A1
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WIPO (PCT)
Prior art keywords
lens
projection lens
image source
projection
focal length
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PCT/CN2019/076959
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English (en)
Chinese (zh)
Inventor
叶丽慧
李明
闻人建科
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浙江舜宇光学有限公司
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Publication of WO2019210736A1 publication Critical patent/WO2019210736A1/fr

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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
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation

Definitions

  • the present application relates to a projection lens, and more particularly, to a projection lens including three lenses.
  • the projection lens needs to have a large field of view and good imaging quality while ensuring miniaturization to ensure image information acquisition.
  • the conventional projection lens usually eliminates various aberrations by increasing the number of lenses, and improves the resolution, which causes an increase in the total length of the projection lens, which is disadvantageous for miniaturization of the lens.
  • a larger field of view causes the distortion of the projection lens to be difficult to control, and the image quality is poor, which is not conducive to the projection of accurate image information.
  • the present application provides a projection lens that is applicable to miniaturized electronic devices that at least solves or partially addresses at least one of the above disadvantages of the prior art.
  • the present application provides a projection lens that includes, in order from the imaging side to the image source side along the optical axis, a first lens, a second lens, and a third lens.
  • the first lens may have a positive power
  • the second lens may have a negative power
  • the near imaging side may be a concave surface
  • the near image source side may be a convex surface
  • the third lens may have a positive power
  • the near imaging side thereof Can be convex.
  • the total effective focal length f of the projection lens and the center thickness CT2 of the second lens on the optical axis may satisfy 3.0 ⁇ f / CT2 ⁇ 5.5.
  • the center thickness CT2 of the second lens on the optical axis and the edge thickness ET2 of the second lens at the maximum effective radius may satisfy 0.5 ⁇ CT2/ET2 ⁇ 1.6.
  • the center thickness CT2 of the second lens on the optical axis and the separation distance T12 of the first lens and the second lens on the optical axis may satisfy 0.3 ⁇ CT2/T12 ⁇ 1.0.
  • the effective focal length f1 of the first lens and the total effective focal length f of the projection lens may satisfy 1.0 ⁇ f1/f ⁇ 1.3.
  • the total effective focal length f of the projection lens and the effective focal length f2 of the second lens may satisfy -3.0 ⁇ f / f2 ⁇ 0.
  • the effective focal length f2 of the second lens and the effective focal length f3 of the third lens may satisfy -2.5 ⁇ f2 / f3 ⁇ -0.5.
  • the radius of curvature R4 of the near image source side of the second lens and the radius of curvature R3 of the near imaging side of the second lens may satisfy 1.5 ⁇ R4 / R3 ⁇ 5.0.
  • the total effective focal length f of the projection lens and the radius of curvature R2 of the near image source side of the first lens may satisfy -1.9 ⁇ f/R2 ⁇ -1.3.
  • the intersection of the near image source side and the optical axis of the second lens to the effective radius apex of the second lens near image source side is the distance SAG22 on the optical axis and the intersection of the near imaging side and the optical axis of the second lens to
  • the distance SAG21 of the effective radius apex of the near-imaging side of the second lens on the optical axis satisfies 0.8 ⁇ SAG22/SAG21 ⁇ 1.3.
  • the refractive index N1 of the first lens and the refractive index N2 of the second lens may satisfy (N1+N2)/2 ⁇ 1.63.
  • the entrance pupil diameter EPD of the projection lens and the diagonal IH of the image source region of the projection lens may satisfy 0.2 ⁇ EPD/IH ⁇ 0.7.
  • the total effective focal length f of the projection lens and the half IH of the diagonal of the image source region of the projection lens may satisfy 0.8 ⁇ f / IH ⁇ 1.3.
  • the maximum effective radius DT11 of the near-imaging side of the first lens and the maximum effective radius DT31 of the near-imaging side of the third lens may satisfy 0.2 ⁇ DT11/DT31 ⁇ 0.5.
  • the near image source side of the third lens may be convex; the total effective focal length f of the projection lens and the curvature radius R6 of the near image source side of the third lens may satisfy -1.0 ⁇ f/R6 ⁇ 0.
  • the near image source side of the third lens may be a concave surface; the effective focal length f2 of the second lens and the effective focal length f3 of the third lens may satisfy ⁇ 2.5 ⁇ f2/f3 ⁇ 1.1; the second lens is near The radius of curvature R4 of the image side and the radius of curvature R3 of the near image side of the second lens may satisfy 1.6 ⁇ R4/R3 ⁇ 2.5; and the center thickness CT2 of the second lens on the optical axis is with the first lens and the second lens
  • the separation distance T12 on the optical axis can satisfy 0.3 ⁇ CT2/T12 ⁇ 0.6.
  • the present invention adopts three lenses, and the projection lens has a large field of view by rationally selecting the lens material and rationally distributing the power, the surface shape, the center thickness of each lens, and the on-axis spacing between the lenses. Angle, miniaturization, and at least one beneficial effect that can be applied to the infrared band.
  • FIG. 1 is a schematic structural view of a projection lens according to Embodiment 1 of the present application.
  • 2A to 2B are respectively a distortion curve and a contrast curve of the projection lens of Embodiment 1;
  • FIG. 3 is a schematic structural view of a projection lens according to Embodiment 2 of the present application.
  • 4A to 4B are respectively a distortion curve and a contrast curve of the projection lens of Embodiment 2;
  • FIG. 5 is a schematic structural diagram of a projection lens according to Embodiment 3 of the present application.
  • 6A to 6B are respectively a distortion curve and a contrast curve of the projection lens of Embodiment 3;
  • FIG. 7 is a schematic structural diagram of a projection lens according to Embodiment 4 of the present application.
  • 8A to 8B are respectively a distortion curve and a contrast curve of the projection lens of Embodiment 4.
  • FIG. 9 is a schematic structural diagram of a projection lens according to Embodiment 5 of the present application.
  • 10A to 10B are respectively a distortion curve and a contrast curve of the projection lens of Embodiment 5;
  • FIG. 11 is a schematic structural view of a projection lens according to Embodiment 6 of the present application.
  • 12A to 12B are respectively a distortion curve and a contrast curve of the projection lens of Embodiment 6;
  • FIG. 13 is a schematic structural diagram of a projection lens according to Embodiment 7 of the present application.
  • 14A to 14B are respectively a distortion curve and a contrast curve of the projection lens of Embodiment 7;
  • FIG. 15 is a schematic structural view of a projection lens according to Embodiment 8 of the present application.
  • 16A to 16B are respectively a distortion curve and a contrast curve of the projection lens of Embodiment 8;
  • FIG. 17 is a schematic structural view of a projection lens according to Embodiment 9 of the present application.
  • 18A to 18B are respectively a distortion curve and a contrast curve of the projection lens of Embodiment 9;
  • FIG. 19 is a schematic structural view of a projection lens according to Embodiment 10 of the present application.
  • FIG. 21 is a schematic structural view of a projection lens according to Embodiment 11 of the present application.
  • 22A to 22B are respectively a distortion curve and a contrast curve of the projection lens of Embodiment 11;
  • FIG. 23 is a schematic structural view of a projection lens according to Embodiment 12 of the present application.
  • 24A to 24B are respectively a distortion curve and a contrast curve of the projection lens of Embodiment 12;
  • FIG. 25 is a schematic structural view of a projection lens according to Embodiment 13 of the present application.
  • 26A to 26B are respectively a distortion curve and a contrast curve of the projection lens of Embodiment 13.
  • first, second, etc. are used to distinguish one feature from another, and do not represent any limitation of the feature.
  • first lens discussed below may also be referred to as a second lens
  • second lens may also be referred to as a first lens, without departing from the teachings of the present application.
  • the thickness, size, and shape of the lens have been somewhat exaggerated for convenience of explanation.
  • the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the spherical or aspherical shape shown in the drawings.
  • the drawings are only examples and are not to scale.
  • a paraxial region refers to a region near the optical axis. If the surface of the lens is convex and the position of the convex surface is not defined, it indicates that the surface of the lens is convex at least in the paraxial region; if the surface of the lens is concave and the position of the concave surface is not defined, it indicates that the surface of the lens is at least in the paraxial region. Concave.
  • the surface of each lens near the image source side is referred to as the near image source side, and the surface of each lens near the imaging side is referred to as the near imaging side.
  • the projection lens according to an exemplary embodiment of the present application may include, for example, three lenses having powers, that is, a first lens, a second lens, and a third lens.
  • the three lenses are sequentially arranged along the optical axis from the imaging side to the image source side.
  • the near imaging side may be convex.
  • the near image source side of the first lens may be convex.
  • the projection lens of the present application may satisfy the conditional expression 3.0 ⁇ f/CT2 ⁇ 5.5, where f is the total effective focal length of the projection lens and CT2 is the center thickness of the second lens on the optical axis. More specifically, f and CT2 can further satisfy 3.08 ⁇ f / CT2 ⁇ 5.33. Satisfying the conditional formula 3.0 ⁇ f / CT2 ⁇ 5.5, is conducive to shortening the total length of the lens.
  • the projection lens of the present application may satisfy the conditional expression (N1+N2)/2 ⁇ 1.63, where N1 is the refractive index of the first lens and N2 is the refractive index of the second lens. More specifically, N1 and N2 may further satisfy 1.53 ⁇ (N1 + N2)/2 ⁇ 1.63.
  • N1 + N2 may further satisfy 1.53 ⁇ (N1 + N2)/2 ⁇ 1.63.
  • the projection lens of the present application may satisfy the conditional expression -3.0 ⁇ f / f2 ⁇ 0, where f is the total effective focal length of the projection lens and f2 is the effective focal length of the second lens. More specifically, f and f2 can further satisfy -2.44 ⁇ f / f2 ⁇ -0.30.
  • Reasonably assigning the total effective focal length of the projection lens and the effective focal length of the second lens can effectively control the deflection of the light, reduce the sensitivity of the lens, and at the same time help to reduce the spherical aberration, astigmatism, etc. of the optical system, and is advantageous for improving the projection lens. Imaging quality.
  • the projection lens of the present application may satisfy the conditional expression 0.8 ⁇ SAG22/SAG21 ⁇ 1.3, wherein the SAG22 is effective for the intersection of the near image source side and the optical axis of the second lens to the second lens near image source side.
  • the on-axis distance of the radius apex, SAG21 is the on-axis distance from the intersection of the near-imaging side of the second lens and the optical axis to the apex of the effective radius of the near-imaging side of the second lens. More specifically, SAG22 and SAG21 can further satisfy 0.87 ⁇ SAG22 / SAG21 ⁇ 1.24.
  • the thickness of the second lens is reasonably configured to make the edge-to-center brightness uniform, thereby effectively improving the contrast, thereby improving the imaging quality of the projection lens.
  • the projection lens of the present application may satisfy the conditional expression 1.0 ⁇ f1/f ⁇ 1.3, where f1 is the effective focal length of the first lens and f is the total effective focal length of the projection lens. More specifically, f1 and f can further satisfy 1.07 ⁇ f1/f ⁇ 1.18.
  • the conditional expression 1.0 ⁇ f1/f ⁇ 1.3 is satisfied, so that the total effective focal length of the projection lens and the effective focal length of the first lens are more rationally distributed, thereby facilitating correction of the spherical aberration of the projection lens and improving the imaging quality of the projection lens.
  • the projection lens of the present application may satisfy the conditional expression -2.5 ⁇ f2 / f3 ⁇ -0.5, where f2 is the effective focal length of the second lens and f3 is the effective focal length of the third lens. More specifically, f2 and f3 can further satisfy -2.14 ⁇ f2 / f3 ⁇ -0.73.
  • the conditional expression -2.5 ⁇ f2 / f3 ⁇ -0.5 is satisfied, so that the distribution of the power of the second lens and the third lens is more reasonable, thereby facilitating correction of the field curvature of the projection lens and improving the imaging quality of the projection lens.
  • the projection lens of the present application may satisfy the conditional expression 1.5 ⁇ R4/R3 ⁇ 5.0, where R4 is the radius of curvature of the near image source side of the second lens, and R3 is the near imaging side of the second lens. Radius of curvature. More specifically, R4 and R3 may further satisfy 1.67 ⁇ R4 / R3 ⁇ 4.86.
  • the conditional expression 1.5 ⁇ R4/R3 ⁇ 5.0 is satisfied, so that the curve of the second lens is smoother and the shape is more uniform, so that the total length of the projection lens can be effectively reduced, and the angle of view of the projection lens can be increased.
  • the projection lens of the present application may satisfy the conditional expression 0.8 ⁇ f/IH ⁇ 1.3, where f is the total effective focal length of the projection lens, and IH is half the diagonal length of the image source region. More specifically, f and IH can further satisfy 0.87 ⁇ f / IH ⁇ 1.29.
  • Reasonably configuring the total effective focal length and image height of the projection lens can effectively reduce the distortion and improve the processing technology of the lens, and at the same time, it can improve the edge brightness of each lens and improve the image quality of the projection lens.
  • the projection lens of the present application may satisfy the conditional expression 0.2 ⁇ EPD/IH ⁇ 0.7, wherein the EPD is the entrance pupil diameter of the projection lens, and IH is half the diagonal length of the image source region. More specifically, EPD and IH can further satisfy 0.35 ⁇ EPD / IH ⁇ 0.64.
  • Reasonable configuration of the entrance lens diameter and image height of the projection lens can effectively control the size of the projection lens, reduce the volume of the projection lens, and realize the miniaturization of the projection lens.
  • the projection lens of the present application may satisfy the conditional expression 0.5 ⁇ CT2/ET2 ⁇ 1.6, where CT2 is the center thickness of the second lens on the optical axis, and ET2 is the second lens at the maximum effective radius. Edge thickness. More specifically, CT2 and ET2 can further satisfy 0.73 ⁇ CT2 / ET2 ⁇ 1.51. By controlling the center of the second lens and the thickness of the edge, the incident angle of the light on the near image source side of the second lens can be effectively controlled, and the imaging quality of the projection lens is improved.
  • the projection lens of the present application may satisfy the conditional expression -1.9 ⁇ f / R2 ⁇ - 1.3, where f is the total effective focal length of the projection lens, and R2 is the radius of curvature of the near image source side of the first lens . More specifically, f and R2 may further satisfy -1.75 ⁇ f / R2 ⁇ -1.36.
  • the projection lens of the present application may satisfy the conditional expression 0.2 ⁇ DT11/DT31 ⁇ 0.5, wherein DT11 is the maximum effective radius of the near imaging side of the first lens, and DT31 is the near imaging side of the third lens.
  • the maximum effective radius. More specifically, DT11 and DT31 can further satisfy 0.26 ⁇ DT11 / DT31 ⁇ 0.39.
  • the projection lens of the present application may satisfy the conditional expression 0.3 ⁇ CT2/T12 ⁇ 1.0, where CT2 is the center thickness of the second lens on the optical axis, and T12 is the first lens and the second lens in the light.
  • CT2 and T12 can further satisfy 0.36 ⁇ CT2 / T12 ⁇ 0.96.
  • the near image source side of the third lens may be convex.
  • the radius of curvature R6 of the near image source side of the third lens and the total effective focal length f of the projection lens may satisfy -1.0 ⁇ f/R6 ⁇ 0. More specifically, f and R6 may further satisfy -0.75 ⁇ f / R6 ⁇ 0.
  • the near-source side of the third lens is convex, which helps to keep the light uniform, no vignetting, and can better correct the distortion.
  • the near image source side of the third lens may be a concave surface.
  • the lens parameters are further adjusted such that the lens satisfies: -2.5 ⁇ f2 / f3 ⁇ -1.1, where f2 is the effective focal length of the second lens, and f3 is Effective focal length of the third lens; 1.6 ⁇ R4 / R3 ⁇ 2.5, where R4 is the radius of curvature of the near image source side of the second lens, R3 is the radius of curvature of the near imaging side of the second lens; and 0.3 ⁇ CT2 / T12 ⁇ 0.6, where CT2 is the center thickness of the second lens on the optical axis, and T12 is the separation distance of the first lens and the second lens on the optical axis.
  • f2 and f3 may further satisfy -2.14 ⁇ f2 / f3 ⁇ - 1.14; R4 and R3 may further satisfy 1.67 ⁇ R4 / R3 ⁇ 2.31; and CT2 and T12 may further satisfy 0.37 ⁇ CT2 / T12 ⁇ 0.59.
  • Such a configuration is advantageous for correcting the field curvature of the projection lens, improving the imaging quality of the projection lens, and effectively shortening the total length of the projection lens and increasing the field of view of the projection lens.
  • the above projection lens may further include at least one aperture to enhance the imaging quality of the lens.
  • an aperture may be disposed between the imaging side and the first lens.
  • the projection lens according to the above embodiment of the present application may employ, for example, three lenses, by reasonably selecting the material of the lens and rationally distributing the power, the surface shape, the center thickness of each lens, and the on-axis spacing between the lenses. Etc., so that the projection lens has sufficient field of view, miniaturization and the like.
  • the projection lens configured as described above can be used as an interactive projection lens applied to the infrared band.
  • an aspherical mirror surface is often used for each lens.
  • the aspherical lens is characterized by a continuous change in curvature from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics, and has the advantages of improving distortion and improving astigmatic aberration. With an aspherical lens, the aberrations that occur during imaging can be eliminated as much as possible, improving image quality.
  • the various results and advantages described in this specification can be obtained without varying the number of lenses that make up the projection lens without departing from the technical solutions claimed herein.
  • the projection lens is not limited to including three lenses.
  • the projection lens can also include other numbers of lenses if desired.
  • FIG. 1 is a block diagram showing the structure of a projection lens according to Embodiment 1 of the present application.
  • a projection lens sequentially includes an aperture STO, a first lens E1, a second lens E2, and a third lens E3 along an optical axis from an imaging side to an image source side.
  • the first lens E1 has a positive refractive power
  • the near imaging side surface S1 is a concave surface
  • the near image source side surface S2 is a convex surface
  • the second lens E2 has a negative refractive power
  • the near imaging side surface S3 is a concave surface
  • the near image source side surface S4 is a convex surface.
  • the third lens E3 has a positive power
  • the near imaging side surface S5 is a convex surface
  • the near image source side surface S6 is a convex surface. Light from the image source S7 sequentially passes through the respective surfaces S6 to S1 and is finally projected onto a target object (not shown) in the space.
  • Table 1 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the projection lens of Example 1, in which the unit of curvature radius and thickness are both millimeters (mm).
  • each aspherical lens can be defined by using, but not limited to, the following aspherical formula:
  • x is the distance of the aspherical surface at height h from the optical axis, and the distance from the aspherical vertex is high;
  • k is the conic coefficient (given in Table 1);
  • Ai is the correction coefficient of the a-th order of the aspherical surface.
  • the higher order coefficient A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 and A 18 which can be used for each aspherical mirror surface S1-S6 in the embodiment 1 are given in Table 2 below.
  • Table 3 gives the effective focal lengths f1 to f3 of the lenses in Embodiment 1, the total effective focal length f of the projection lens, and the maximum half angle of view HFOV of the projection lens.
  • FIG. 2A shows a distortion curve of the projection lens of Embodiment 1, which shows the amount of distortion corresponding to the height of different image sources.
  • Fig. 2B shows a phase contrast curve of the projection lens of Embodiment 1, which shows the degree of contrast corresponding to the height of different image sources.
  • the projection lens given in Embodiment 1 can achieve good image quality.
  • FIG. 3 is a schematic structural view of a projection lens according to Embodiment 2 of the present application.
  • a projection lens sequentially includes an aperture STO, a first lens E1, a second lens E2, and a third lens E3 from the imaging side to the image source side along the optical axis.
  • the first lens E1 has a positive refractive power
  • the near imaging side surface S1 is a concave surface
  • the near image source side surface S2 is a convex surface
  • the second lens E2 has a negative refractive power
  • the near imaging side surface S3 is a concave surface
  • the near image source side surface S4 is a convex surface.
  • the third lens E3 has a positive power
  • the near imaging side surface S5 is a convex surface
  • the near image source side surface S6 is a convex surface. Light from the image source S7 sequentially passes through the respective surfaces S6 to S1 and is finally projected onto a target object (not shown) in the space.
  • Table 4 shows the surface type, the radius of curvature, the thickness, the material, and the conical coefficient of each lens of the projection lens of Example 2, wherein the unit of the radius of curvature and the thickness are each mm (mm).
  • Table 5 shows the high order coefficient which can be used for each aspherical mirror in Embodiment 2, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 6 gives the effective focal lengths f1 to f3 of the lenses in Embodiment 2, the total effective focal length f of the projection lens, and the maximum half angle of view HFOV of the projection lens.
  • Fig. 4A shows a distortion curve of the projection lens of Embodiment 2, which shows the amount of distortion amount corresponding to the height of different image sources.
  • Fig. 4B shows a phase contrast curve of the projection lens of Embodiment 2, which shows the degree of contrast corresponding to the height of different image sources. 4A and 4B, the projection lens given in Embodiment 2 can achieve good image quality.
  • FIG. 5 is a schematic structural view of a projection lens according to Embodiment 3 of the present application.
  • a projection lens sequentially includes an aperture STO, a first lens E1, a second lens E2, and a third lens E3 from the imaging side to the image source side along the optical axis.
  • the first lens E1 has a positive refractive power
  • the near imaging side surface S1 is a concave surface
  • the near image source side surface S2 is a convex surface
  • the second lens E2 has a negative refractive power
  • the near imaging side surface S3 is a concave surface
  • the near image source side surface S4 is a convex surface.
  • the third lens E3 has a positive power
  • the near imaging side surface S5 is a convex surface
  • the near image source side surface S6 is a convex surface. Light from the image source S7 sequentially passes through the respective surfaces S6 to S1 and is finally projected onto a target object (not shown) in the space.
  • Table 7 shows the surface type, the radius of curvature, the thickness, the material, and the conical coefficient of each lens of the projection lens of Example 3, wherein the units of the radius of curvature and the thickness are each mm (mm).
  • Table 8 shows the high order term coefficients which can be used for each aspherical mirror surface in Embodiment 3, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 9 gives the effective focal lengths f1 to f3 of the lenses in Embodiment 3, the total effective focal length f of the projection lens, and the maximum half angle of view HFOV of the projection lens.
  • Fig. 6A shows a distortion curve of the projection lens of Embodiment 3, which shows the amount of distortion amount corresponding to the height of different image sources.
  • Fig. 6B shows a phase contrast curve of the projection lens of Embodiment 3, which shows the degree of contrast corresponding to the height of the different image sources. 6A and 6B, the projection lens given in Embodiment 3 can achieve good image quality.
  • FIG. 7 is a block diagram showing the structure of a projection lens according to Embodiment 4 of the present application.
  • a projection lens sequentially includes an aperture STO, a first lens E1, a second lens E2, and a third lens E3 from the imaging side to the image source side along the optical axis.
  • the first lens E1 has a positive refractive power
  • the near imaging side surface S1 is a convex surface
  • the near image source side surface S2 is a convex surface
  • the second lens E2 has a negative refractive power
  • the near imaging side surface S3 is a concave surface
  • the near image source side surface S4 is a convex surface.
  • the third lens E3 has a positive power
  • the near imaging side surface S5 is a convex surface
  • the near image source side surface S6 is a concave surface. Light from the image source S7 sequentially passes through the respective surfaces S6 to S1 and is finally projected onto a target object (not shown) in the space.
  • Table 10 shows the surface type, the radius of curvature, the thickness, the material, and the conical coefficient of each lens of the projection lens of Example 4, wherein the unit of the radius of curvature and the thickness are each mm (mm).
  • Table 11 shows the high order coefficient which can be used for each aspherical mirror in Embodiment 4, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 12 gives the effective focal lengths f1 to f3 of the lenses in Embodiment 4, the total effective focal length f of the projection lens, and the maximum half angle of view HFOV of the projection lens.
  • Fig. 8A shows a distortion curve of the projection lens of Embodiment 4, which shows the amount of distortion amount corresponding to the height of different image sources.
  • Fig. 8B shows a phase contrast curve of the projection lens of Embodiment 4, which shows the degree of contrast corresponding to the height of different image sources. 8A and 8B, the projection lens given in Embodiment 4 can achieve good image quality.
  • FIG. 9 is a block diagram showing the structure of a projection lens according to Embodiment 5 of the present application.
  • a projection lens sequentially includes an aperture STO, a first lens E1, a second lens E2, and a third lens E3 from the imaging side to the image source side along the optical axis.
  • the first lens E1 has a positive refractive power
  • the near imaging side surface S1 is a convex surface
  • the near image source side surface S2 is a convex surface
  • the second lens E2 has a negative refractive power
  • the near imaging side surface S3 is a concave surface
  • the near image source side surface S4 is a convex surface.
  • the third lens E3 has a positive power
  • the near imaging side surface S5 is a convex surface
  • the near image source side surface S6 is a convex surface. Light from the image source S7 sequentially passes through the respective surfaces S6 to S1 and is finally projected onto a target object (not shown) in the space.
  • Table 13 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the projection lens of Example 5, in which the unit of the radius of curvature and the thickness are each mm (mm).
  • Table 14 shows the high order coefficient which can be used for each aspherical mirror surface in Embodiment 5, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 15 gives the effective focal lengths f1 to f3 of the lenses in Embodiment 5, the total effective focal length f of the projection lens, and the maximum half angle of view HFOV of the projection lens.
  • Fig. 10A shows a distortion curve of the projection lens of Embodiment 5, which shows the amount of distortion amount corresponding to the height of different image sources.
  • Fig. 10B shows a phase contrast curve of the projection lens of Embodiment 5, which shows the degree of contrast corresponding to the height of different image sources. 10A and 10B, the projection lens given in Embodiment 5 can achieve good image quality.
  • FIG. 11 is a block diagram showing the structure of a projection lens according to Embodiment 6 of the present application.
  • a projection lens sequentially includes an aperture STO, a first lens E1, a second lens E2, and a third lens E3 from the imaging side to the image source side along the optical axis.
  • the first lens E1 has a positive refractive power
  • the near imaging side surface S1 is a convex surface
  • the near image source side surface S2 is a convex surface
  • the second lens E2 has a negative refractive power
  • the near imaging side surface S3 is a concave surface
  • the near image source side surface S4 is a convex surface.
  • the third lens E3 has a positive power
  • the near imaging side surface S5 is a convex surface
  • the near image source side surface S6 is a convex surface. Light from the image source S7 sequentially passes through the respective surfaces S6 to S1 and is finally projected onto a target object (not shown) in the space.
  • Table 16 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the projection lens of Example 6, wherein the units of the radius of curvature and the thickness are each mm (mm).
  • Table 17 shows the high order coefficient which can be used for each aspherical mirror surface in Embodiment 6, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 18 gives the effective focal lengths f1 to f3 of the lenses in Embodiment 6, the total effective focal length f of the projection lens, and the maximum half angle of view HFOV of the projection lens.
  • Fig. 12A shows a distortion curve of the projection lens of Embodiment 6, which shows the amount of distortion amount corresponding to the height of different image sources.
  • Fig. 12B shows a phase contrast curve of the projection lens of Embodiment 6, which shows the degree of contrast corresponding to the height of different image sources. 12A and 12B, the projection lens given in Embodiment 6 can achieve good image quality.
  • FIG. 13 is a block diagram showing the structure of a projection lens according to Embodiment 7 of the present application.
  • a projection lens sequentially includes an aperture STO, a first lens E1, a second lens E2, and a third lens E3 from the imaging side to the image source side along the optical axis.
  • the first lens E1 has a positive refractive power
  • the near imaging side surface S1 is a convex surface
  • the near image source side surface S2 is a convex surface
  • the second lens E2 has a negative refractive power
  • the near imaging side surface S3 is a concave surface
  • the near image source side surface S4 is a convex surface.
  • the third lens E3 has a positive power
  • the near imaging side surface S5 is a convex surface
  • the near image source side surface S6 is a concave surface. Light from the image source S7 sequentially passes through the respective surfaces S6 to S1 and is finally projected onto a target object (not shown) in the space.
  • Table 19 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the projection lens of Example 7, wherein the units of the radius of curvature and the thickness are each mm (mm).
  • Table 20 shows the high order term coefficients which can be used for the respective aspherical mirrors in Embodiment 7, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 21 gives the effective focal lengths f1 to f3 of the respective lenses in Embodiment 7, the total effective focal length f of the projection lens, and the maximum half angle of view HFOV of the projection lens.
  • Fig. 14A shows a distortion curve of the projection lens of Embodiment 7, which shows the amount of distortion amount corresponding to the height of different image sources.
  • Fig. 14B shows a phase contrast curve of the projection lens of Embodiment 7, which shows the degree of contrast corresponding to the height of the different image sources. 14A and 14B, the projection lens given in Embodiment 7 can achieve good image quality.
  • FIG. 15 is a block diagram showing the structure of a projection lens according to Embodiment 8 of the present application.
  • a projection lens sequentially includes an aperture STO, a first lens E1, a second lens E2, and a third lens E3 from the imaging side to the image source side along the optical axis.
  • the first lens E1 has a positive refractive power
  • the near imaging side surface S1 is a concave surface
  • the near image source side surface S2 is a convex surface
  • the second lens E2 has a negative refractive power
  • the near imaging side surface S3 is a concave surface
  • the near image source side surface S4 is a convex surface.
  • the third lens E3 has a positive power
  • the near imaging side surface S5 is a convex surface
  • the near image source side surface S6 is a concave surface. Light from the image source S7 sequentially passes through the respective surfaces S6 to S1 and is finally projected onto a target object (not shown) in the space.
  • Table 22 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the projection lens of Example 8, wherein the units of the radius of curvature and the thickness are each mm (mm).
  • Table 23 shows the high order term coefficients which can be used for the respective aspherical mirrors in Embodiment 8, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 24 gives the effective focal lengths f1 to f3 of the lenses in Embodiment 8, the total effective focal length f of the projection lens, and the maximum half angle of view HFOV of the projection lens.
  • Fig. 16A shows a distortion curve of the projection lens of Embodiment 8, which shows the amount of distortion amount corresponding to the height of different image sources.
  • Fig. 16B shows a phase contrast curve of the projection lens of Embodiment 8, which shows the degree of contrast corresponding to the height of different image sources. 16A and 16B, the projection lens given in Embodiment 8 can achieve good image quality.
  • FIG. 17 is a block diagram showing the structure of a projection lens according to Embodiment 9 of the present application.
  • a projection lens sequentially includes an aperture STO, a first lens E1, a second lens E2, and a third lens E3 from the imaging side to the image source side along the optical axis.
  • the first lens E1 has a positive refractive power
  • the near imaging side surface S1 is a concave surface
  • the near image source side surface S2 is a convex surface
  • the second lens E2 has a negative refractive power
  • the near imaging side surface S3 is a concave surface
  • the near image source side surface S4 is a convex surface.
  • the third lens E3 has a positive power
  • the near imaging side surface S5 is a convex surface
  • the near image source side surface S6 is a convex surface. Light from the image source S7 sequentially passes through the respective surfaces S6 to S1 and is finally projected onto a target object (not shown) in the space.
  • Table 25 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the projection lens of Example 9, in which the unit of curvature radius and thickness are both millimeters (mm).
  • Table 26 shows the high order coefficient which can be used for each aspherical mirror surface in Embodiment 9, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 27 gives the effective focal lengths f1 to f3 of the lenses in Embodiment 9, the total effective focal length f of the projection lens, and the maximum half angle of view HFOV of the projection lens.
  • Fig. 18A shows a distortion curve of the projection lens of Embodiment 9, which shows the amount of distortion magnitude corresponding to the height of different image sources.
  • Fig. 18B shows a phase contrast curve of the projection lens of Embodiment 9, which shows the degree of contrast corresponding to the height of different image sources.
  • the projection lens given in Embodiment 9 can achieve good image quality.
  • FIG. 19 is a block diagram showing the structure of a projection lens according to Embodiment 10 of the present application.
  • a projection lens sequentially includes an aperture STO, a first lens E1, a second lens E2, and a third lens E3 from the imaging side to the image source side along the optical axis.
  • the first lens E1 has a positive refractive power
  • the near imaging side surface S1 is a convex surface
  • the near image source side surface S2 is a convex surface
  • the second lens E2 has a negative refractive power
  • the near imaging side surface S3 is a concave surface
  • the near image source side surface S4 is a convex surface.
  • the third lens E3 has a positive power
  • the near imaging side surface S5 is a convex surface
  • the near image source side surface S6 is a convex surface. Light from the image source S7 sequentially passes through the respective surfaces S6 to S1 and is finally projected onto a target object (not shown) in the space.
  • Table 28 shows the surface type, the radius of curvature, the thickness, the material, and the conical coefficient of each lens of the projection lens of Example 10, wherein the units of the radius of curvature and the thickness are each mm (mm).
  • Table 29 shows the high order coefficient which can be used for each aspherical mirror surface in Embodiment 10, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 30 gives the effective focal lengths f1 to f3 of the lenses in Embodiment 10, the total effective focal length f of the projection lens, and the maximum half angle of view HFOV of the projection lens.
  • Fig. 20A shows a distortion curve of the projection lens of Embodiment 10, which shows the amount of distortion magnitude corresponding to the height of different image sources.
  • Fig. 20B shows a phase contrast curve of the projection lens of Embodiment 10, which shows the degree of contrast corresponding to the height of different image sources.
  • the projection lens given in Embodiment 10 can achieve good image quality.
  • FIGS. 21 to 22B A projection lens according to Embodiment 11 of the present application is described below with reference to FIGS. 21 to 22B.
  • 21 is a schematic structural view of a projection lens according to Embodiment 11 of the present application.
  • a projection lens sequentially includes an aperture STO, a first lens E1, a second lens E2, and a third lens E3 from the imaging side to the image source side along the optical axis.
  • the first lens E1 has a positive refractive power
  • the near imaging side surface S1 is a convex surface
  • the near image source side surface S2 is a convex surface
  • the second lens E2 has a negative refractive power
  • the near imaging side surface S3 is a concave surface
  • the near image source side surface S4 is a convex surface.
  • the third lens E3 has a positive power
  • the near imaging side surface S5 is a convex surface
  • the near image source side surface S6 is a convex surface. Light from the image source S7 sequentially passes through the respective surfaces S6 to S1 and is finally projected onto a target object (not shown) in the space.
  • Table 31 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the projection lens of Example 11, wherein the units of the radius of curvature and the thickness are each mm (mm).
  • Table 32 shows the high order coefficient which can be used for each aspherical mirror surface in Embodiment 11, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 33 gives the effective focal lengths f1 to f3 of the lenses in Embodiment 11, the total effective focal length f of the projection lens, and the maximum half angle of view HFOV of the projection lens.
  • Fig. 22A shows a distortion curve of the projection lens of Embodiment 11, which shows the amount of distortion amount corresponding to the height of different image sources.
  • Fig. 22B shows a phase contrast curve of the projection lens of Embodiment 11, which shows the degree of contrast corresponding to the height of different image sources. 22A and 22B, the projection lens given in Embodiment 11 can achieve good image quality.
  • FIG. 23 is a block diagram showing the structure of a projection lens according to Embodiment 12 of the present application.
  • a projection lens sequentially includes an aperture STO, a first lens E1, a second lens E2, and a third lens E3 from the imaging side to the image source side along the optical axis.
  • the first lens E1 has a positive refractive power
  • the near imaging side surface S1 is a convex surface
  • the near image source side surface S2 is a convex surface
  • the second lens E2 has a negative refractive power
  • the near imaging side surface S3 is a concave surface
  • the near image source side surface S4 is a convex surface.
  • the third lens E3 has a positive power
  • the near imaging side surface S5 is a convex surface
  • the near image source side surface S6 is a convex surface. Light from the image source S7 sequentially passes through the respective surfaces S6 to S1 and is finally projected onto a target object (not shown) in the space.
  • Table 34 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the projection lens of Example 12, in which the unit of the radius of curvature and the thickness are all millimeters (mm).
  • Table 35 shows the high order coefficient which can be used for each aspherical mirror surface in Embodiment 12, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 36 gives the effective focal lengths f1 to f3 of the respective lenses in Embodiment 12, the total effective focal length f of the projection lens, and the maximum half angle of view HFOV of the projection lens.
  • Fig. 24A shows a distortion curve of the projection lens of Embodiment 12, which shows the amount of distortion magnitude corresponding to the height of different image sources.
  • Fig. 24B shows a phase contrast curve of the projection lens of Embodiment 12, which shows the degree of contrast corresponding to the height of different image sources. 24A and 24B, the projection lens given in Embodiment 12 can achieve good image quality.
  • FIG. 25 is a block diagram showing the structure of a projection lens according to Embodiment 13 of the present application.
  • a projection lens sequentially includes an aperture STO, a first lens E1, a second lens E2, and a third lens E3 from the imaging side to the image source side along the optical axis.
  • the first lens E1 has a positive refractive power
  • the near imaging side surface S1 is a concave surface
  • the near image source side surface S2 is a convex surface
  • the second lens E2 has a negative refractive power
  • the near imaging side surface S3 is a concave surface
  • the near image source side surface S4 is a convex surface.
  • the third lens E3 has a positive power
  • the near imaging side surface S5 is a convex surface
  • the near image source side surface S6 is a concave surface. Light from the image source S7 sequentially passes through the respective surfaces S6 to S1 and is finally projected onto a target object (not shown) in the space.
  • Table 37 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the projection lens of Example 13, wherein the units of the radius of curvature and the thickness are each mm (mm).
  • Table 38 shows the high order term coefficients which can be used for the respective aspherical mirrors in Embodiment 13, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 39 gives the effective focal lengths f1 to f3 of the lenses in Embodiment 13, the total effective focal length f of the projection lens, and the maximum half angle of view HFOV of the projection lens.
  • Fig. 26A shows a distortion curve of the projection lens of Embodiment 13, which shows the amount of distortion amount corresponding to the height of different image sources.
  • Fig. 26B shows a phase contrast curve of the projection lens of Embodiment 13, which shows the degree of contrast corresponding to the height of different image sources. 26A and 26B, the projection lens given in Embodiment 13 can achieve good image quality.
  • Embodiments 1 to 13 respectively satisfy the relationship shown in Table 40.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Lenses (AREA)

Abstract

La présente invention concerne une lentille de projection. La lentille de projection comprend , depuis un côté imagerie vers un côté source d'image le long d'un axe optique : une première lentille (E1), une deuxième lentille (E2), et une troisième lentille (E3). La première lentille (E1) a une puissance focale positive; la deuxième lentille (E2) a une puissance focale négative, et une surface proche du côté imagerie de celle-ci est une surface concave tandis qu'une surface proche du côté de source d'image de celle-ci est une surface convexe; et la troisième lentille (E3) a une puissance focale positive, et une surface proche du côté imagerie de celle-ci est une surface convexe. La longueur focale efficace totale f de la lentille de projection et l'épaisseur centrale CT2 de la deuxième lentille (E2) sur l'axe optique satisfont l'expression 3,0 ≤ f/CT2 < 5,5.
PCT/CN2019/076959 2018-05-04 2019-03-05 Lentille de projection WO2019210736A1 (fr)

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CN109991718B (zh) * 2019-02-22 2024-04-12 成都九天画芯科技有限公司 一种长焦投影镜头及投影机
CN111856767B (zh) 2019-04-24 2022-09-23 信泰光学(深圳)有限公司 测距仪及其显示器镜组装置
CN112230381B (zh) * 2020-10-31 2022-01-07 诚瑞光学(苏州)有限公司 摄像光学镜头
CN112684589B (zh) * 2021-01-15 2022-08-19 浙江舜宇光学有限公司 一种摄像镜头组
CN113126258B (zh) * 2021-04-23 2023-05-02 浙江舜宇光学有限公司 光学成像镜头
CN113296236B (zh) * 2021-05-12 2022-08-30 江西晶超光学有限公司 红外光学系统、红外接收模组及电子设备
CN114924393B (zh) * 2022-05-13 2024-01-26 深圳市汇顶科技股份有限公司 红外投影镜头
WO2023216219A1 (fr) * 2022-05-13 2023-11-16 深圳市汇顶科技股份有限公司 Lentille de projection infrarouge
CN116068730B (zh) * 2023-03-20 2023-09-12 江西联创电子有限公司 投影镜头

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