WO2021070948A1 - Élément de commande de flux lumineux, dispositif électroluminescent, dispositif source lumineuse locale et dispositif d'affichage - Google Patents

Élément de commande de flux lumineux, dispositif électroluminescent, dispositif source lumineuse locale et dispositif d'affichage Download PDF

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Publication number
WO2021070948A1
WO2021070948A1 PCT/JP2020/038351 JP2020038351W WO2021070948A1 WO 2021070948 A1 WO2021070948 A1 WO 2021070948A1 JP 2020038351 W JP2020038351 W JP 2020038351W WO 2021070948 A1 WO2021070948 A1 WO 2021070948A1
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WIPO (PCT)
Prior art keywords
control member
flux control
light
luminous flux
light emitting
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PCT/JP2020/038351
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English (en)
Japanese (ja)
Inventor
俊彦 持田
悠生 藤井
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株式会社エンプラス
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Publication of WO2021070948A1 publication Critical patent/WO2021070948A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements

Definitions

  • the present invention relates to a luminous flux control member that controls the light distribution of light emitted from a light emitting element.
  • the present invention also relates to a light emitting device having the luminous flux control member, a surface light source device having the light emitting device, and a display device having the surface light source device.
  • a direct type surface light source device may be used as a backlight.
  • a direct type surface light source device having a plurality of light emitting elements has been used as a light source.
  • the direct type surface light source device has a substrate, a plurality of light emitting elements, a plurality of luminous flux control members (lenses), and a light diffusing member.
  • the plurality of light emitting elements are arranged in a matrix on the substrate.
  • a luminous flux control member that spreads the light emitted from each light emitting element in the surface direction of the substrate is arranged on each light emitting element.
  • the light emitted from the luminous flux control member is spread by the light diffusing member (for example, a light diffusing plate) and illuminates the irradiated member (for example, a liquid crystal panel) in a planar manner.
  • FIG. 1 is a cross-sectional view showing the configuration of a conventional luminous flux control member shown in Patent Document 1.
  • the conventional luminous flux control member 20 has an incident surface 22 for incident light emitted from the light emitting element 10 and an emitting surface 24 for emitting light incident from the incident surface 22 to the outside. ..
  • the incident surface 22 is a concave surface with respect to the light emitting element 10, and is arranged so as to face the light emitting element 10. Further, in the vicinity of the central axis CA of the luminous flux control member 20, the exit surface 24 is also a concave surface.
  • the luminous flux control member 20 refracts the light emitted from the light emitting element 10 on the incident surface 22 and the emitting surface 24 in a direction away from the optical axis of the light emitting element 10 (central axis CA of the luminous flux control member 20).
  • the light emitted from the light emitting element 10 is spread in the surface direction of the substrate.
  • the incident surface 22 and the exit surface 24 are concave surfaces in the vicinity of the central axis CA of the light flux control member 20 so as to be directly above the light emitting element 10.
  • the light emitted in the direction is refracted in a direction away from the optical axis of the light emitting element 10 (central axis CA of the luminous flux control member 20).
  • the distance between the luminous flux control member 20 and the light diffusing member is wide to some extent, the light is emitted directly upward from the light emitting element 10 and the light controlled by the luminous flux control member 20 is the optical axis of the light emitting element 10 (the luminous flux control member 20). It reaches the light diffusing member at a position away from the central axis CA). Therefore, in the surface light source device including the conventional luminous flux control member 20, it is possible to prevent the region near the light emitting element 10 from becoming excessively bright.
  • the distance between the luminous flux control member 20 and the light diffusing member 20 is very narrow as described above, the light emitted from the light emitting element 10 in the direct upward direction and controlled by the luminous flux control member 20 is the optical axis of the light emitting element 10 (luminous flux control). It reaches the light diffusing member before it leaves the central axis CA) of the member 20.
  • the region near the light emitting element 10 becomes excessively bright, and uneven brightness occurs.
  • the conventional luminous flux control member 20 has a problem that uneven brightness occurs when used in a thin surface light source device.
  • An object of the present invention is to provide a luminous flux control member capable of suppressing luminance unevenness even when used in a thin surface light source device.
  • Another object of the present invention is to provide a light emitting device having the luminous flux control member, a surface light source device having the light emitting device, and a display device having the surface light source device.
  • the present invention is a light flux control member that controls the light distribution of light emitted from a light emitting element, and is an inner surface of a recess arranged behind the light flux control member so as to intersect the central axis of the light flux control member.
  • the light emitted from the light emitting element is incident on the inside of the light flux control member, and is arranged so as to surround the central axis on the front side of the light flux control member.
  • the plurality of first protrusions are a first reflection surface, a second reflection surface, and a first reflection surface and a second reflection surface, respectively. It has a ridge line that is an intersection line, and when the light flux control member is viewed in a plan view, the plurality of first ridges are arranged radially with respect to the central axis.
  • the light emitting device of the present invention includes a light emitting element and a light flux control member of the present invention in which the incident surface is arranged so as to face the light emitting element.
  • the surface light source device of the present invention includes a light emitting device of the present invention and a light diffusing member that diffuses and transmits light from the light emitting device.
  • the display device of the present invention includes the surface light source device of the present invention and a display member that is irradiated with light emitted from the surface light source device.
  • FIG. 1 is a cross-sectional view showing the configuration of a conventional luminous flux control member.
  • 2A and 2B are diagrams showing the configuration of the surface light source device according to the first embodiment.
  • 3A and 3B are cross-sectional views showing the configuration of the surface light source device according to the first embodiment.
  • FIG. 4 is a partially enlarged cross-sectional view of a part of FIG. 3B.
  • 5A to 5F are views showing the configuration of the luminous flux control member according to the first embodiment.
  • 6A to 6D are views showing the configuration of the luminous flux control member according to the first embodiment when there is an inclined surface on the back surface.
  • 7A to 7D are views showing a configuration in the light flux control member according to the first embodiment when there are a plurality of second ridges on the inclined surface on the back surface.
  • 8A to 8C are diagrams showing the measurement results of the luminance distribution of one light emitting device of the surface light source device according to the first embodiment.
  • 9A to 9F are views showing the configuration of the luminous flux control member according to the second embodiment.
  • 10A to 10D are views showing the configuration of the luminous flux control member according to the second embodiment when there is an inclined surface on the back surface.
  • 11A to 11D are views showing a configuration in the light flux control member according to the second embodiment when there are a plurality of ridges on the inclined surface on the back surface.
  • 12A to 12C are diagrams showing the measurement results of the luminance distribution of one light emitting device of the surface light source device according to the second embodiment.
  • a surface light source device suitable for a backlight of a liquid crystal display device or the like will be described.
  • These surface light source devices 100 can be used as a display device 100'by combining with a display member (irradiated member) 102 (for example, a liquid crystal panel) that is irradiated with light from the surface light source device.
  • a display member (irradiated member) 102 for example, a liquid crystal panel
  • FIG. 2A is a plan view
  • FIG. 2B is a front view
  • 3A is a cross-sectional view taken along the line AA shown in FIG. 2B
  • FIG. 3B is a cross-sectional view taken along the line BB shown in FIG. 2A
  • FIG. 4 is a partially enlarged cross-sectional view of a part of FIG. 3B.
  • the surface light source device 100 includes a housing 110, a plurality of light emitting devices 200, and a light diffusing member 120.
  • the plurality of light emitting devices 200 are arranged in a matrix on the bottom plate 112 of the housing 110.
  • the inner surface of the bottom plate 112 functions as a diffuse reflection surface.
  • the top plate 114 of the housing 110 is provided with an opening.
  • the light diffusing member 120 is arranged so as to close the opening and functions as a light emitting surface.
  • the size of the light emitting surface is not particularly limited, but is, for example, about 400 mm ⁇ about 700 mm.
  • each of the plurality of light emitting devices 200 is fixed on the substrate 210.
  • Each of the plurality of substrates 210 is fixed at a predetermined position on the bottom plate 112 of the housing 110.
  • Each of the plurality of light emitting devices 200 has a light emitting element 220 and a light flux control member 300.
  • the light emitting element 220 is a light source of the surface light source device 100 and is mounted on the substrate 210.
  • the light emitting element 220 is a light emitting diode (LED) such as a white light emitting diode.
  • the luminous flux control member 300 is a diffusion lens that controls the light distribution of the light emitted from the light emitting element 220, and is fixed on the substrate 210.
  • the luminous flux control member 300 is arranged on the light emitting element 220 so that its central axis CA coincides with the optical axis LA of the light emitting element 220 (see FIG. 5B).
  • the incident surface 320 and the exit surface 330 of the luminous flux control member 300 which will be described later, are both rotationally symmetric (circular symmetric), and their rotation axes coincide with each other (see FIG. 5).
  • the rotation axes of the entrance surface 320 and the exit surface 330 are referred to as "central axis CA of the luminous flux control member".
  • optical axis LA of the light emitting element means a light ray at the center of a three-dimensional emitted light flux from the light emitting element 220.
  • a gap is formed between the substrate 210 on which the light emitting element 220 is mounted and the back surface 350 of the luminous flux control member 300 to release the heat generated from the light emitting element 220 to the outside.
  • the luminous flux control member 300 is integrally molded.
  • the material of the luminous flux control member 300 is not particularly limited as long as it is a material capable of passing light of a desired wavelength.
  • the material of the luminous flux control member 300 is a light-transmitting resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), or epoxy resin (EP), or glass.
  • the surface light source device 100 has a main feature in the configuration of the luminous flux control member 300. Therefore, the luminous flux control member 300 will be described in detail separately.
  • the light diffusing member 120 is a plate-shaped member having light diffusing properties, and transmits the light emitted from the light emitting device 200 while diffusing it.
  • the light diffusing member 120 has almost the same size as an irradiated member such as a liquid crystal panel.
  • the light diffusing member 120 is formed of a light transmitting resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene (PS), and styrene / methyl methacrylate copolymer resin (MS).
  • PMMA polymethyl methacrylate
  • PC polycarbonate
  • PS polystyrene
  • MS styrene / methyl methacrylate copolymer resin
  • fine irregularities are formed on the surface of the light diffusing member 120, or light diffusing elements such as beads are dispersed inside the light diffusing member 120.
  • the light emitted from each light emitting element 220 is spread by the luminous flux control member 300 so as to illuminate a wide range of the light diffusing member 120.
  • the light emitted from each luminous flux control member 300 is further diffused by the light diffusing member 120.
  • the surface light source device 100 according to the present embodiment can uniformly illuminate the surface-shaped irradiated member (for example, a liquid crystal panel).
  • FIG. 5A to 5D are views showing the configuration of the luminous flux control member 300 according to the first embodiment.
  • 5A is a plan view
  • FIG. 5B is a cross-sectional view taken along the line CC of FIG. 5A
  • FIG. 5C is a bottom view
  • FIG. 5D is a front view.
  • the luminous flux control member 300 has a recess 310, an incident surface 320, an exit surface 330, a first ridge 340, a back surface 350, a flange portion 370, and a plurality of leg portions 380.
  • the recess 310 is formed in the central portion on the back side (light emitting element 220 side) of the luminous flux control member 300.
  • the inner surface of the recess 310 functions as an incident surface 320.
  • the incident surface 320 causes most of the light emitted from the light emitting element 220 (see FIG. 4) to enter the inside of the luminous flux control member 300 while controlling the traveling direction thereof. Therefore, the luminous flux control member 300 is arranged so that the incident surface 320 faces the light emitting element 220.
  • the incident surface 320 intersects the central axis CA of the luminous flux control member 300 and is rotationally symmetric (circularly symmetric) about the central axis CA.
  • the shape of the recess 310 is not particularly limited, but is, for example, a semi-long sphere (a shape obtained by dividing a spheroid obtained by using the long axis of an ellipse as a rotation axis into two along a short axis).
  • the exit surface 330 is formed on the front side (light diffusion member 120 side) of the luminous flux control member 300 so as to protrude from the flange portion 370.
  • the exit surface 330 emits the light incident on the luminous flux control member 300 to the outside while controlling the traveling direction.
  • the exit surface 330 is rotationally symmetric (circularly symmetric) about the central axis CA.
  • the emission surface 330 includes a first emission surface 330a arranged in a predetermined range (near the central axis CA) centered on the central axis CA on the front side of the luminous flux control member 300, and a plurality of emission surfaces 330a described later. It has a second exit surface 330b arranged so as to surround the area where the first ridge 340 is arranged (see FIGS. 5A and 5B).
  • the first exit surface 330a is a smooth curved surface having a concave shape with respect to the light diffusing member 120, but the shape of the first exit surface 330a is not limited to this.
  • the first exit surface 330a may be omitted.
  • the second exit surface 330b is a smooth curved surface that is convex with respect to the light diffusing member 120, but the shape of the second exit surface 330b is not limited to this.
  • the plurality of first ridges 340 are radial (rotationally symmetric) with respect to the central axis of the luminous flux control member 300 so as to surround the central axis CA of the luminous flux control member 300. It is arranged like this.
  • "arranged so as to surround the central axis CA” is not only arranged so as to surround the central axis CA over the entire circumference (360 °), but also a portion around the central axis CA. Including surrounding the target.
  • the plurality of first protrusions 340 are arranged between the first exit surface 330a and the second exit surface 330b so as to surround the first exit surface 330a.
  • FIG. 5E is an enlarged view of the first ridge 340
  • FIG. 5F is a cross-sectional view taken along the line DD of FIG. 5E.
  • the first ridge 340 has a first reflecting surface 341, a second reflecting surface 342, and a ridge line 343 which is an intersection of the first reflecting surface 341 and the second reflecting surface.
  • the cross-sectional shape of the first ridge 340 is substantially triangular. The light that travels in the luminous flux control member 300 and reaches the first reflection surface 341 is sequentially reflected by the first reflection surface 341 and the second reflection surface 342, and travels in the luminous flux control member 300 again.
  • the light that travels in the luminous flux control member 300 and reaches the second reflection surface 342 is sequentially reflected by the second reflection surface 342 and the first reflection surface 341, and travels in the luminous flux control member 300 again.
  • the plurality of first ridges 340 reflect a part of the light incident from the incident surface 320 so that the light does not escape directly above the light emitting element 220 (luminous flux control member 300).
  • the plurality of first ridges 340 reflect the light incident from the incident surface toward, for example, the back surface 350.
  • the ridge line 343 is a curve connecting the first exit surface 330a and the second exit surface 330b, as shown in FIG. 5B.
  • the widths of the first reflecting surface 341 and the second reflecting surface 342 become maximum near the center in the extending direction of the first ridge 340 as shown in FIG. 5E, and the luminous flux control member It becomes thinner toward each of the central axis CA and the outer edge of 300. Therefore, the plan view shape of the first ridge 340 is a V shape in which the second exit surface 330b is inserted between the first reflection surface 341 and the second reflection surface 342.
  • the cross-sectional area of the first ridge 340 becomes maximum near the center in the extending direction of the first ridge 340, and decreases toward the central axis.
  • the angle ⁇ formed by the first reflecting surface 341 and the second reflecting surface 342 reflects the light incident from the incident surface 320.
  • the temperature is preferably 75 ° to 135 °, and more preferably 85 ° to 125 °.
  • At least a part of the plurality of first ridges 340 is from the central axis CA to the highest part of the light flux control member 300 (the part excluding the first ridge 340) when the light flux control member 300 is viewed in a plan view. It is preferably arranged within the range.
  • the highest portion of the luminous flux control member 300 (the portion excluding the first ridge 340) exists as a circular ridge line surrounding the central axis CA of the luminous flux control member 300. This ridge line exists near the boundary between the region where the plurality of first protrusions 340 are arranged and the second exit surface 330b. Most of the plurality of first ridges 340 are arranged between the central axis CA and this ridgeline.
  • the plurality of first ridges 340 may be arranged so as to cover 30% to 100% of the surface area in the range from the central axis CA to the highest portion (ridge line) of the luminous flux control member. preferable. Further, in the above V-shape, it is preferable that the intersection of the first reflecting surface 341, the second reflecting surface 342, and the second emitting surface 330b is near the highest portion (ridge line) of the luminous flux control member 300 (FIG. See 5A and E). As a result, the light that has reached the first ridge 340 can be reflected so that the light does not escape directly above the light emitting element 220 (luminous flux control member 300).
  • the back surface 350 is a flat surface located on the back side of the luminous flux control member 300 and extending in the radial direction from the opening edge of the recess 310.
  • the back surface 350 causes the light emitted from the light emitting element 220 that was not incident from the incident surface 320 to enter the luminous flux control member 300.
  • the flange portion 370 is located between the outer peripheral portion of the exit surface 330 and the outer peripheral portion of the back surface 350, and protrudes outward in the radial direction.
  • the shape of the collar portion 370 is substantially annular.
  • the flange portion 370 is not an essential component, the provision of the collar portion 370 facilitates the handling and positioning of the luminous flux control member 300.
  • the thickness of the flange portion 370 is not particularly limited, and is determined in consideration of the required area of the exit surface 330, the moldability of the collar portion 370, and the like.
  • the plurality of legs 380 are substantially columnar members protruding from the back surface 350.
  • the plurality of legs 380 support the luminous flux control member 300 at an appropriate position with respect to the light emitting element 220.
  • the luminous flux control member 300 may have a reflecting portion 450 on the back side.
  • 6A to 6D are views showing the configuration of the luminous flux control member 300 according to the first modification having the reflecting portion 450 on the back side.
  • 6A is a plan view
  • FIG. 6B is a cross-sectional view taken along the line EE of FIG. 6A
  • FIG. 6C is a bottom view
  • FIG. 6D is a front view.
  • the reflecting portion 450 is arranged in an annular shape on the back side (light emitting element 220 side) of the luminous flux control member 300 so as to surround the opening of the central axis CA and the recess 310.
  • the reflecting portion 450 has an inclined surface 451 for reflecting the light reflected by the first ridge 340 toward the back surface 350 in the lateral direction (diameterally outside with respect to the central axis CA).
  • the reflecting portion 450 is formed on the back surface 350 as an annular groove centered on the central axis CA (see FIG. 6C).
  • the cross-sectional shape of the annular groove in the cross section including the central axis CA is substantially V-shaped (see FIG. 6B).
  • the inner surface is substantially parallel to the central axis CA, while the outer surface is inclined at a predetermined angle (for example, 30 °) with respect to the central axis CA.
  • the surface is 451.
  • a plurality of second ridges 440 may be formed on the outer inclined surface 451 described above.
  • 7A to 7D are views showing the configuration of the luminous flux control member 300 according to the second modification having the plurality of second ridges 440.
  • 7A is a plan view
  • FIG. 7B is a cross-sectional view taken along the line FF of FIG. 7A
  • FIG. 7C is a bottom view
  • FIG. 7D is a front view.
  • each second ridge 440 is a line of intersection between the planar third reflecting surface 441, the planar fourth reflecting surface 442, and the third reflecting surface 441 and the fourth reflecting surface 442. It has a ridge line 443 and functions like a total reflection prism (see FIG. 7C). As shown in FIG. 7B, the virtual straight line including the ridge line 443 of the second ridge 440 intersects the central axis CA at a position on the front side (light diffusing member 120 side) of the ridge line 443.
  • each second ridge 440 has a predetermined angle (for example, 30 °) with respect to the central axis CA so that the front side (light diffusing member 120 side) is closer to the central axis CA than the back side (light emitting element 220 side). ) Is tilted.
  • the light that reaches the reflecting portion 450 is sequentially reflected by the two surfaces (third reflecting surface 441 and the fourth reflecting surface 442) of any of the second ridges 440, and becomes light that goes in the lateral direction.
  • the light reflected by the reflecting unit 450 is emitted from, for example, the second emitting surface 330b.
  • the position of the reflecting portion 450 is not particularly limited, but it is preferable that the reflecting portion 450 is formed in a region where a large amount of light reflected by the first ridge 340 reaches.
  • the arrival position of the light reflected by the first ridge 340 changes depending on various factors such as the shape of the first ridge 340, but the reflecting portion 450 is the light flux control member 300 in the light flux control member 300 (first ridge 340). It is preferable that the portion is arranged outside the highest portion (the portion excluding 340) (the ridgeline in the above example) (the position away from the central axis CA).
  • the parameters were set as follows. (parameter) -Length of one side of the light emitting surface of the light emitting element 220: 2.9 mm (diagonal length: about 4.1 mm) -Outer diameter of the luminous flux control member 300: ⁇ 13 mm -Opening diameter of the recess 310 that serves as the incident surface 320: ⁇ 4 mm -Space between the luminous flux control member 300 and the light diffusing member 120: 5 mm, 8 mm, 10 mm
  • FIG. 8A shows the luminance distribution when the distance between the luminous flux control member 300 and the light diffusing member 120 is 5 mm
  • FIG. 8B shows the luminance distribution when the distance between the luminous flux control member 300 and the light diffusing member 120 is 8 mm
  • FIG. 8C shows the luminance distribution when the distance between the luminous flux control member 300 and the light diffusing member 120 is an optical distance of 10 mm.
  • FIGS. 8A to 8C comparing the luminous flux control member 300 according to the first embodiment with the conventional luminous flux control member, the following results were obtained. That is, as shown in FIG. 8A, when the distance between the luminous flux control member 300 and the light diffusing member 120 was 5 mm, the central luminance decrease rate was about 20% and the half width increase amount was about 5 mm. As shown in FIG. 8B, when the distance between the luminous flux control member 300 and the light diffusing member 120 was 8 mm, the central luminance decrease rate was about 6 to 7%, and the half width increase amount was about 1 mm. As shown in FIG.
  • the central luminance decrease rate was about 0% and the half width increase amount was about 0 mm.
  • the light emitting element 220 is large and the diameter of the concave portion 310 is large, so that light with respect to the incident surface 320 is emitted. It is considered to be particularly useful when it is difficult to control the angle (see FIG. 5B).
  • Emodiment 2 (Structure of surface light source device and light emitting device)
  • the embodiment shown in FIGS. 5 to 7 in that the surface light source device and the light emitting device according to the second embodiment have the light flux control member 500 according to the second embodiment instead of the light flux control member 300 according to the first embodiment. It is different from the surface light source device 100 and the light emitting device 200 according to the first embodiment. Therefore, in the present embodiment, only the luminous flux control member 500 according to the second embodiment will be described.
  • FIG. 9A to 9D are views showing the configuration of the luminous flux control member 500 according to the second embodiment.
  • 9A is a plan view
  • FIG. 9B is a cross-sectional view taken along the line CC of FIG. 9A
  • FIG. 9C is a bottom view
  • FIG. 9D is a front view.
  • the luminous flux control member 500 according to the second embodiment is different from the luminous flux control member 300 according to the first embodiment in the shape and the like of the first ridge 540. Therefore, in the luminous flux control member 500 according to the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
  • the plurality of first protrusions 540 of the light flux control member 500 are radial with respect to the central axis so as to surround the central axis CA on the front side of the light flux control member 500. It is arranged so as to be (rotational symmetry).
  • "arranged so as to surround the central axis CA” is not only arranged so as to surround the central axis CA over the entire circumference (360 °), but also a portion around the central axis CA. Including surrounding the target.
  • the plurality of first protrusions 540 are arranged between the first exit surface 330a and the second exit surface 330b so as to surround the first exit surface 330a.
  • FIG. 9E is an enlarged view of the first ridge 540
  • FIG. 9F is a cross-sectional view taken along the line DD of FIG. 9E.
  • the first ridge 540 has a first reflecting surface 541, a second reflecting surface 542, and a ridge line 543 that is an intersection of the first reflecting surface 541 and the second reflecting surface.
  • the cross-sectional shape of the first ridge 540 is substantially triangular. The light that travels in the luminous flux control member 500 and reaches the first reflection surface 541 is sequentially reflected by the first reflection surface 541 and the second reflection surface 542, and travels in the luminous flux control member 500 again.
  • the light that travels in the luminous flux control member 500 and reaches the second reflection surface 542 is sequentially reflected by the second reflection surface 542 and the first reflection surface 541, and travels in the luminous flux control member 500 again.
  • the plurality of first ridges 540 reflect a part of the light incident from the incident surface 320 so that the light does not escape directly above the light emitting element 220 (luminous flux control member 500).
  • the plurality of first ridges 540 reflect the light incident from the incident surface toward, for example, the back surface 350.
  • the ridge line 543 is a curve at a position higher than the curve connecting the first exit surface 330a and the second exit surface 330b toward the outer edge from the central axis CA. It becomes.
  • the lower side (the side closer to the back side of the lens) of the first reflecting surface 541 and the second reflecting surface 542 is a curve substantially along the curve connecting the first emitting surface 330a and the second emitting surface 330b.
  • the widths of the first reflecting surface 541 and the second reflecting surface 542 become thicker from the central axis of the luminous flux control member 500 toward the outer edge, as shown in FIG. 9E.
  • the first ridge 540 has a substantially triangular shape when viewed in a plan view.
  • the cross-sectional area of the first ridge 540 becomes maximum near the outer edge in the extending direction of the first ridge 540, and decreases toward the central axis.
  • the angle ⁇ formed by the first reflecting surface 541 and the second reflecting surface 542 reflects the light incident from the incident surface 320.
  • the temperature is preferably 75 ° to 135 °, and more preferably 85 ° to 125 °.
  • At least a part of the plurality of first ridges 540 is from the central axis CA to the highest part of the light flux control member 500 (the part excluding the first ridge 540) when the light flux control member 500 is viewed in a plan view. It is preferably arranged within the range.
  • the highest portion of the luminous flux control member 500 (the portion excluding the first convex 540) exists as a circular ridge line surrounding the central axis CA of the luminous flux control member 500. This ridge line exists near the boundary between the region where the plurality of first protrusions 540 are arranged and the second exit surface 330b. Most of the plurality of first ridges 540 are arranged between the central axis CA and this ridgeline.
  • the plurality of first ridges 540 may be arranged so as to cover 30% to 100% of the surface area in the range from the central axis CA to the highest portion (ridge line) of the luminous flux control member. preferable. As a result, the light that has reached the first ridge 540 can be reflected so that the light does not escape directly above the light emitting element 220 (luminous flux control member 500).
  • the first modification of the luminous flux control member 500 may have a reflecting portion 450 on the back side, and FIGS. 10A to 10A D indicates the luminous flux control member 500 in this case.
  • 10A is a plan view of the luminous flux control member 500
  • FIG. 10B is a cross-sectional view taken along the line DD of FIG. 10A
  • FIG. 10C is a bottom view
  • FIG. 10D is a front view.
  • FIGS. 11A to 11D show the luminous flux control member 500 in this case.
  • 11A is a plan view
  • FIG. 11B is a cross-sectional view taken along the line BB of FIG. 11A
  • FIG. 11C is a bottom view
  • FIG. 11D is a front view.
  • FIG. 12A shows the luminance distribution when the distance between the luminous flux control member 500 and the light diffusing member 120 is 5 mm
  • FIG. 12B shows the luminance distribution when the distance between the luminous flux control member 500 and the light diffusing member 120 is 8 mm
  • FIG. 12C shows the luminance distribution when the distance between the luminous flux control member 500 and the light diffusing member 120 is 10 mm.
  • FIGS. 12A to 12C comparing the luminous flux control member 500 according to the second embodiment with the conventional luminous flux control member, the following results were obtained. That is, as shown in FIG. 12A, when the distance between the luminous flux control member 500 and the light diffusing plate 120 was 5 mm, the central luminance decrease rate was about 20% and the half width increase amount was about 5 mm. As shown in FIG. 12B, when the distance between the luminous flux control member 500 and the light diffusing plate 120 was 8 mm, the central luminance decrease rate was about 6 to 7%, and the half width increase amount was about 1 mm. As shown in FIG.
  • the central luminance decrease rate was about 0% and the half width increase amount was about 0 mm.
  • the light is suppressed from escaping in the vicinity immediately above the luminous flux control member, which is particularly remarkable when the distance between the luminous flux control member 500 and the light diffusing member 120 is short.
  • the first convex ridge 540 is provided on the front side of the luminous flux control member 500 as in the present embodiment, the light emitting element 220 is large and the diameter of the concave portion 310 is large, so that light with respect to the incident surface 320 is emitted. It is considered to be particularly useful when it is difficult to control the angle (see FIG. 9B).
  • the luminous flux control member, the light emitting device, and the surface light source device of the present invention can be applied to, for example, a backlight of a liquid crystal display device, general lighting, and the like.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Liquid Crystal (AREA)

Abstract

La présente invention concerne la fourniture d'un élément de commande de flux lumineux susceptible de supprimer une luminance irrégulière, même lorsqu'il est utilisé dans un dispositif source lumineuse à portée modérée. La présente invention concerne un élément de commande de flux lumineux permettant la commande de distribution de lumière émise par un élément électroluminescent, ledit élément présentant une surface d'entrée lumineuse, agencée de manière à croiser un axe central au niveau de son côté arrière ; de multiples premières crêtes, agencées de manière à entourer l'axe central au niveau du côté avant ; et une surface de sortie lumineuse, agencée de manière à entourer les multiples premières crêtes au niveau du côté avant. Les multiples premières crêtes sont disposées radialement par rapport à l'axe central selon une vue en plan de l'élément de commande de flux lumineux.
PCT/JP2020/038351 2019-10-11 2020-10-09 Élément de commande de flux lumineux, dispositif électroluminescent, dispositif source lumineuse locale et dispositif d'affichage WO2021070948A1 (fr)

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JP2019188051A JP2021064505A (ja) 2019-10-11 2019-10-11 光束制御部材、発光装置、面光源装置および表示装置
JP2019-188051 2019-10-11

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014022126A (ja) * 2012-07-13 2014-02-03 Omron Corp 光偏向素子並びに当該素子を用いた照光スイッチ及び面光源装置
JP2014063718A (ja) * 2012-08-27 2014-04-10 Enplas Corp 光束制御部材、発光装置、面光源装置および表示装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014022126A (ja) * 2012-07-13 2014-02-03 Omron Corp 光偏向素子並びに当該素子を用いた照光スイッチ及び面光源装置
JP2014063718A (ja) * 2012-08-27 2014-04-10 Enplas Corp 光束制御部材、発光装置、面光源装置および表示装置

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