WO2018225438A1 - Lentille - Google Patents

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Publication number
WO2018225438A1
WO2018225438A1 PCT/JP2018/017713 JP2018017713W WO2018225438A1 WO 2018225438 A1 WO2018225438 A1 WO 2018225438A1 JP 2018017713 W JP2018017713 W JP 2018017713W WO 2018225438 A1 WO2018225438 A1 WO 2018225438A1
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WO
WIPO (PCT)
Prior art keywords
lens
optical axis
light
plan
comparative example
Prior art date
Application number
PCT/JP2018/017713
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English (en)
Japanese (ja)
Inventor
淳 興津
秀行 今井
Original Assignee
アルプス電気株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by アルプス電気株式会社 filed Critical アルプス電気株式会社
Publication of WO2018225438A1 publication Critical patent/WO2018225438A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/04—Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere, e.g. so called "aspheric" lenses

Definitions

  • the present invention relates to a lens used in a projector, a vehicle headlight, and the like.
  • the infrared illumination system described in Patent Document 1 includes a configuration in which a collimator and a microlens array are sequentially arranged from the light source side.
  • the incident surface of the microlens array is formed as a spherical surface or an aspherical surface, and a plurality of surfaces are formed on the output surface.
  • a microlens is formed.
  • the illumination system described in Patent Document 2 includes an illumination lens that equalizes the intensity of light emitted from a light source.
  • the illumination lens has an incident surface formed as a fly-eye lens surface, and the output surface is spherical or It is formed as an aspherical surface.
  • an object of the present invention is to provide a lens that can be downsized while realizing a large numerical aperture and that is easy to manufacture.
  • a lens array surface or a fly-eye lens surface is formed on the first side surface of the biconvex lens, and the second side surface facing the first side surface is spherical or aspherical. Or a free-form surface.
  • the first side surface is a spherical surface, an aspherical surface, or a free-form surface.
  • the lens array surface and the fly-eye lens surface have a plurality of single lenses arranged in a matrix in a plan view viewed along the optical axis direction of the biconvex lens. It is preferable that they have symmetrical shapes in plan view and are arranged in the same direction.
  • the plurality of single lenses are preferably formed in a hexagonal shape or a quadrangular shape in plan view. Thereby, the shape design of the 1st side surface for ensuring desired optical performance can be performed easily.
  • the first side surface is the entrance surface
  • the second side surface is the exit surface
  • the condensing lens that collects the exit light from the second side surface, or the exit light from the second side surface It can be set as the collimating lens made into parallel light.
  • the present invention it is possible to provide a lens that can be downsized while realizing a large numerical aperture and that is easy to manufacture.
  • FIG. 6 is a diagram illustrating an example of light rays of a lens according to Example 1.
  • FIG. It is a figure which shows the example of the light ray of the lens which concerns on the comparative example 1.
  • FIG. 6 is a graph showing the relationship between coordinates in a direction perpendicular to the optical axis and SAG amount (lens height in the optical axis direction) in Example 1 and Comparative Example 1.
  • FIG. 6 is a diagram illustrating an image in which light emitted from a lens according to Example 1 is connected to a projection surface.
  • A shows the light intensity at each position along the line A1 in FIG. 6, and
  • B shows the light intensity at each position along the line A2 in FIG. It is a figure which shows the image which the emitted light from the lens which concerns on the comparative example 1 connects to a projection surface.
  • A shows the light intensity at each position along the line A11 in FIG. 8, and
  • (B) shows the light intensity at each position along the line A12 in FIG. It is a side view which shows the structure of the lens which concerns on 2nd Embodiment of this invention.
  • FIG. 6 is a diagram illustrating an example of light rays of a lens according to Example 2.
  • FIG. It is a figure which shows the example of the light ray of the lens which concerns on the comparative example 2.
  • FIG. 10 is a graph showing the relationship between the coordinates in the direction perpendicular to the optical axis and the SAG amount in Example 2.
  • 10 is a graph showing the relationship between the coordinates in the direction perpendicular to the optical axis and the SAG amount in Comparative Example 2.
  • FIGS. 8A to 8F are diagrams illustrating images formed by light emitted from a lens according to Example 2 for each distance from the lens.
  • (A)-(F) are figures which show the light intensity in each position along the A21 line of FIG. 16 for every distance from a lens.
  • (A)-(F) are figures which show the light intensity in each position along the A22 line
  • (A) to (F) are diagrams showing images formed by light emitted from a lens according to Comparative Example 2 for each distance from the lens.
  • (A)-(F) are figures which show the light intensity in each position along the A31 line
  • (A)-(F) are figures which show the light intensity in each position along the A32 line
  • FIG. 1 is a side view showing the configuration of the lens 10 according to the first embodiment of the present invention.
  • FIG. 2 is a plan view showing the configuration of the first side surface 20 of the lens 10.
  • the lens 10 includes two side surfaces 20 and 30 that face each other along the optical axis AX.
  • the lens 10 is made of glass or resin and is integrally manufactured by molding.
  • the plano-convex lens-like first side surface 20 and second side surface 30 may be manufactured separately, and the respective planes may be joined to each other.
  • the first side surface 20 has a spherical surface, an aspherical surface, or a free-form surface having a convex surface directed outward along the optical axis AX.
  • the free curved surface is, for example, a curved surface in which a spherical surface and an aspheric surface are arranged in a composite manner.
  • a lens array surface or a fly-eye lens surface is formed on the spherical surface, aspherical surface, or free-form surface.
  • This lens array surface or fly-eye lens surface has a plurality of single lenses arranged in a matrix in a plan view as viewed along the direction of the optical axis AX. Each has a symmetrical shape and is arranged in the same direction.
  • the single lenses 21 formed in a hexagonal shape in a plan view are arranged in the same direction.
  • the planar shape of the single lens 21 is not limited to a hexagon, and may be a circle, an ellipse, or a rectangle, for example.
  • the direction in which the single lenses 21 are arranged is not limited to the direction shown in FIG.
  • the second side surface 30 has a spherical surface, an aspherical surface, or a free-form surface with a convex surface outward along the optical axis AX.
  • the free curved surface is, for example, a curved surface in which a spherical surface and an aspheric surface are arranged in a composite manner.
  • a laser light source can be used as a light source for entering light into the lens 10, and either a single mode or a multi mode may be used.
  • FIG. 3 is a diagram illustrating an example of light rays of the lens L1 according to the first embodiment.
  • FIG. 4 is a diagram illustrating an example of light rays of the lens L11 according to the first comparative example.
  • FIG. 5 is a diagram illustrating the shapes of the second side surface r2 in the first embodiment and the second side surface r12 in the first comparative example.
  • FIG. 6 is a diagram illustrating an image in which the light emitted from the lens L1 according to the first embodiment is connected to the projection plane I.
  • 7A shows the light intensity at each position along the line A1 in FIG. 6
  • FIG. 7B shows the light intensity at each position along the line A2 in FIG.
  • FIG. 8 is a diagram illustrating an image in which the emitted light from the lens L11 according to the comparative example 1 is connected to the projection plane I.
  • 9A shows the light intensity at each position along the line A11 in FIG. 8
  • FIG. 9B shows the light intensity at each position along the line A12 in FIG.
  • Example 1 As shown in FIG. 3, when light from the light source S is incident on the first side surface r1 of the lens L1 (optical axis AX1) of the first embodiment, the emitted light from the second side surface r2 is incident on the projection surface I. Form an image.
  • the first side surface r1 corresponds to the first side surface 20 shown in FIG. 1
  • the second side surface r2 corresponds to the second side surface 30 shown in FIG.
  • the light source S uses a single mode laser light source, and the intensity distribution of the emitted light is a Gaussian distribution.
  • the first side surface r1 on the light source S side has an aspherical shape with a convex surface facing the light source S side, and a fly-eye lens surface is formed on this surface.
  • the aspherical shape of the first side surface r1 has a paraxial radius of curvature of 4.5 mm.
  • the fly-eye lens surface formed on the first side surface r1 has a plurality of single lenses arranged in a matrix in a plan view seen along the direction of the optical axis AX1.
  • the plurality of single lenses project to the light source S side with a radius of curvature of 2.5 mm, and each have a hexagonal shape (substantially regular hexagonal) in plan view in which the interval between facing sides is 250 ⁇ m.
  • the second side surface r2 has a shape with a convex surface directed toward the projection surface I along the optical axis AX1, as shown in Numerical Example 1 below.
  • the lens L11 of Comparative Example 1 includes two side surfaces r11 and r12 that face each other along the optical axis AX11.
  • the first side surface r11 on the light source S side has a plane orthogonal to the optical axis AX11, and a fly-eye lens surface is formed on this surface.
  • the fly-eye lens surface has a plurality of single lenses arranged in a matrix in a plan view viewed along the direction of the optical axis AX11.
  • the plurality of single lenses protrude toward the light source S with a radius of curvature of 2.2 mm, and each has a hexagonal shape (substantially regular hexagonal) in plan view in which the interval between facing sides is 250 ⁇ m.
  • the second side surface r12 has a shape with a convex surface directed toward the projection surface I along the optical axis AX11 as shown in the following numerical example.
  • each aspheric shape is represented by the following formula (I) using each aspheric coefficient in each example and each comparative example.
  • the coordinate in the optical axis direction is X
  • the coordinate in the direction perpendicular to the optical axis is Y (unit: mm).
  • X (Y 2 / R) / [1+ ⁇ 1 ⁇ (1 + K) ⁇ (Y 2 / R 2 ) ⁇ 1/2 ] + A ⁇ Y 4 + B ⁇ Y 6 + C ⁇ Y 8 + D ⁇ Y 10 (I) here, R is the paraxial radius of curvature (unit: mm), K is the cone coefficient, A, B, C, and D are fourth-order, sixth-order, eighth-order, and tenth-order aspheric coefficients, respectively. “En” (n is an integer) indicates “10 ⁇ n ”.
  • FIG. 5 is a graph with the coordinate Y on the horizontal axis and the SAG amount on the vertical axis.
  • Example 1 in which the first side surface r1 is aspherical, the following effects are obtained compared to Comparative Example 1 in which the first side surface r11 is a plane. It was.
  • the paraxial radius of curvature R (absolute value) of the second side surface r2 that is the exit surface could be increased from 1.420270 mm in the case of Comparative Example 1 to 1.7 mm.
  • the SAG amount (absolute value) of the second side surface r2 could be reduced by about 0.32 mm from 1.078140 mm in the case of Comparative Example 1 to 0.6848456 mm. That is, from the above (1) and (2), in the first embodiment, the inclination of the outer edge side of the second side surface r2 can be made gentle so that the numerical aperture can be increased without increasing the difficulty of lens manufacturing. It can be seen that it is possible to increase.
  • the image formed on the projection surface I has an outer shape corresponding to the shape of a single lens constituting the fly-eye lens surface, and the horizontal direction of the lenses L1 and L11 is the left-right direction.
  • the vertical direction corresponds to the direction H
  • the vertical direction corresponds to the vertical direction V of the lenses L1 and L11.
  • the A1 line in FIG. 6 and the A11 line in FIG. 8 are lines along the horizontal direction H
  • FIG. 10 is a side view showing the configuration of the lens 110 according to the second embodiment of the present invention.
  • FIG. 11 is a plan view showing the configuration of the first side surface 120 of the lens 110.
  • the lens 110 includes two side surfaces 120 and 130 that face each other along the optical axis AX.
  • the lens 110 is formed by the same material and manufacturing method as the lens 10 of the first embodiment.
  • the first side surface 120 has a spherical surface, an aspherical surface, or a free-form surface having a convex surface directed outward along the optical axis AX.
  • the free curved surface is, for example, a curved surface in which a spherical surface and an aspheric surface are arranged in a composite manner.
  • a lens array surface or a fly-eye lens surface is formed on the spherical surface, aspherical surface, or free-form surface.
  • This lens array surface or fly-eye lens surface has a plurality of single lenses arranged in a matrix in a plan view viewed along the direction of the optical axis AX, and the plurality of single lenses are in a plan view.
  • Each has a symmetrical shape and is arranged in the same direction.
  • the single lenses 121 formed in a hexagonal shape in a plan view are arranged in the same direction.
  • the planar shape of the single lens 121 is not limited to a hexagon, and may be, for example, a circle, an ellipse, or a rectangle.
  • the direction in which the single lenses 121 are arranged is not limited to the direction shown in FIG.
  • the second side surface 130 has a spherical surface, an aspherical surface, or a free-form surface having a convex surface outward along the optical axis AX.
  • the free curved surface is, for example, a curved surface in which a spherical surface and an aspheric surface are arranged in a composite manner.
  • the light source that makes light incident on the lens 110 is the same as the light source used for the lens 10 of the first embodiment.
  • FIG. 12 is a diagram illustrating an example of light rays of the lens L21 according to the second embodiment.
  • FIG. 13 is a diagram illustrating an example of light rays of the lens L31 according to the comparative example 2.
  • FIG. 14 is a diagram illustrating the shapes of the first side surface r21 and the second side surface r22 in the second embodiment.
  • FIG. 15 is a diagram illustrating the shapes of the first side surface r31 and the second side surface r32 in the second comparative example.
  • Example 2 As shown in FIG. 12, when light from the light source S is incident on the first side surface r21 of the lens L21 (optical axis AX21) of the second embodiment, the emitted light from the second side surface r22 is substantially parallel light. Emitted.
  • the emitted light is slightly expanded.
  • the first side surface r21 corresponds to the first side surface 120 shown in FIG. 10
  • the second side surface r22 corresponds to the second side surface 130 shown in FIG.
  • the light source S uses a single mode laser light source, and the intensity distribution of the emitted light is a Gaussian distribution.
  • the first side surface r21 on the light source S side has an aspherical shape with a convex surface facing the light source S side, and a fly-eye lens surface is formed on this surface.
  • the second side surface r22 has a shape with a convex surface facing the image side along the optical axis AX21.
  • the shapes of the first side surface r21 and the second side surface r22 are as follows.
  • each aspheric shape is represented by the above formula (I) using each aspheric coefficient in each example and each comparative example.
  • the single lens on the fly-eye lens surface of the first side surface r21 has a radius of curvature of 4.3 mm and protrudes toward the light source S, and each has a hexagonal shape (substantially regular hexagonal) in plan view with an interval between opposing sides of 250 ⁇ m. ing.
  • SAG amount (lens height in the optical axis direction) at the coordinate Y in the direction perpendicular to the optical axis is as follows (unit: mm).
  • Y SAG amount (r21) SAG amount (r22) 0 0.000000E + 00 1.800000E + 00 0.1 1.132836E-03 1.798564E + 00 0.2 4.489436E-03 1.794253E + 00 0.3 9.947179E-03 1.787050E + 00 0.4 1.731181E-02 1.776932E + 00 0.5 2.633174E-02 1.763864E + 00 0.6 3.671632E-02 1.747803E + 00 0.7 4.815639E-02 1.728694E + 00 0.8 6.034482E-02 1.706474E + 00 0.9 7.299434E-02 1.681069E + 00 1 8.584946E-02 1.652396E +
  • Comparative Example 2 As shown in FIG. 13, when light from the light source S is incident on the first side surface r31 of the lens L31 (optical axis AX31) of Comparative Example 2, the emitted light from the second side surface r32 is substantially parallel light. Emitted.
  • the emitted light is slightly expanded.
  • the first side surface r31 is a plane
  • the second side surface r32 corresponds to the second side surface 130 shown in FIG.
  • the light source S uses a single mode laser light source, and the intensity distribution of the emitted light is a Gaussian distribution.
  • the second side surface r32 has a shape with a convex surface facing the image side along the optical axis AX31.
  • the shapes of the first side surface r31 and the second side surface r32 are as follows.
  • each aspheric shape is represented by the above formula (I) using each aspheric coefficient in each example and each comparative example.
  • SAG amount (lens height in the optical axis direction) at the coordinate Y in the direction perpendicular to the optical axis is as follows (unit: mm).
  • Y SAG amount (r31) SAG amount (r32) 0 0.000000E + 00 1.800000E + 00 0.1 5.000000E-10 1.798012E + 00 0.2 2.000000E-09 1.792036E + 00 0.3 4.500000E-09 1.782044E + 00 0.4 8.000000E-09 1.767988E + 00 0.5 1.250000E-08 1.749812E + 00 0.6 1.800000E-08 1.727455E + 00 0.7 2.450000E-08 1.700858E + 00 0.8 3.200000E-08 1.669975E + 00 0.9 4.050000E-08 1.634776E + 00 1 5.000000E-08 1.595250E + 00 1.1 6.050000E-08 1.5513
  • FIGS. 16A to 16F are diagrams showing images formed by the light emitted from the lens according to Example 2 for each distance from the lens
  • FIGS. 17A to 17F are lines A21 in FIG.
  • FIGS. 18A to 18F show the light intensity at each position along the line A22 in FIG. 16, and show the light intensity at each position along the line A22 in FIG. FIG.
  • FIGS. 19A to 19F show images formed by the light emitted from the lens according to Comparative Example 2 for each distance from the lens
  • FIGS. 20A to 20F show the line A31 in FIG.
  • FIG. 21A to FIG. 21F show the light intensity at each position along the line A32 in FIG. 19 for each distance from the lens.
  • FIGS. 16A to 21F the distance from the lens center on the optical axis is set as follows, and the image or light intensity at each position is shown.
  • FIG. 16B, FIG. 17B, FIG. 18B, FIG. 19B, FIG. 20B, FIG. 21B distance from the lens center on the optical axis
  • Example 2 in which the first side surface r21 is an aspheric surface, the following effects are obtained as compared with Comparative Example 2 in which the first side surface r31 is a flat surface.
  • the paraxial radius of curvature R (absolute value) of the second side surface r22, which is the exit surface, could be increased from 2.5157 mm in the case of Comparative Example 2 to 3.4838 mm.
  • the SAG amount (absolute value) of the second side surface r22 could be reduced by about 0.34 mm from 1.177249 mm in the case of Comparative Example 2 to 0.8378557 mm. That is, from the above (1) and (2), the inclination of the outer edge side of the second side surface r22 can be made gentle in the second embodiment, thereby increasing the numerical aperture without increasing the difficulty of lens manufacturing. It can be seen that it is possible to increase.
  • FIGS. 16A to 16F and FIGS. 19A to 19F the horizontal direction corresponds to the horizontal direction H of the lenses L21 and L31, and the vertical direction corresponds to the vertical direction V of the lenses L21 and L31.
  • a line A21 in FIGS. 16A to 16F and a line A31 in FIGS. 19A to 19F are lines along the horizontal direction H, and are line A22 in FIGS. 16A to 16F.
  • a line A32 in FIGS. 19A to 19F is a line forming 30 degrees with respect to the horizontal direction H.
  • FIGS. 19A to 21F according to the second comparative example are compared with each other. Regardless of the distance from the image, the light intensity is almost uniform, and an image with the same area is obtained. Therefore, it can be seen that a thick beam with almost uniform light intensity can be obtained in a deep focus state.
  • the lens according to the present invention is useful in that it can be miniaturized while realizing a large numerical aperture and can be easily manufactured.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Lenses (AREA)
  • Projection Apparatus (AREA)

Abstract

Le problème décrit par la présente invention est de fournir une lentille susceptible de créer une ouverture numérique plus grande tout en diminuant la taille de la lentille et de faciliter sa fabrication. La solution porte sur un réseau de lentilles ou une lentille en œil de mouche qui est formé sur la première surface d'une lentille biconvexe. La seconde surface opposée à la première surface est une surface sphérique, asphérique ou de forme libre. La première surface est une surface sphérique, asphérique ou de forme libre. Le réseau de lentilles ou la lentille en œil de mouche a une pluralité de lentilles unitaires agencées dans une matrice en vue en plan le long de l'axe optique de la lentille biconvexe. Chacune de la pluralité de lentilles unitaires a une forme symétrique en vue en plan et est alignée dans la même direction.
PCT/JP2018/017713 2017-06-05 2018-05-08 Lentille WO2018225438A1 (fr)

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JP2017-111147 2017-06-05
JP2017111147 2017-06-05

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114609707A (zh) * 2020-12-09 2022-06-10 微凤凰有限公司 设置有各自具有非球面形状的相反侧的微透镜
JP7507356B2 (ja) 2019-12-09 2024-06-28 パナソニックＩｐマネジメント株式会社 光源装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003344609A (ja) * 2002-05-23 2003-12-03 Fuji Photo Film Co Ltd 集光レンズ、合波レーザー光源および露光装置
JP2004029236A (ja) * 2002-06-24 2004-01-29 Canon Inc 画像表示装置
JP2004038051A (ja) * 2002-07-08 2004-02-05 Fuji Photo Film Co Ltd 露光用レーザー光源
JP2015022244A (ja) * 2013-07-23 2015-02-02 株式会社リコー 固体光源装置及び画像投射装置
WO2015182619A1 (fr) * 2014-05-27 2015-12-03 ナルックス株式会社 Réseau de microlentilles et optique contenant un réseau de microlentilles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003344609A (ja) * 2002-05-23 2003-12-03 Fuji Photo Film Co Ltd 集光レンズ、合波レーザー光源および露光装置
JP2004029236A (ja) * 2002-06-24 2004-01-29 Canon Inc 画像表示装置
JP2004038051A (ja) * 2002-07-08 2004-02-05 Fuji Photo Film Co Ltd 露光用レーザー光源
JP2015022244A (ja) * 2013-07-23 2015-02-02 株式会社リコー 固体光源装置及び画像投射装置
WO2015182619A1 (fr) * 2014-05-27 2015-12-03 ナルックス株式会社 Réseau de microlentilles et optique contenant un réseau de microlentilles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7507356B2 (ja) 2019-12-09 2024-06-28 パナソニックＩｐマネジメント株式会社 光源装置
CN114609707A (zh) * 2020-12-09 2022-06-10 微凤凰有限公司 设置有各自具有非球面形状的相反侧的微透镜

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