WO2021070948A1 - Light flux control member, light-emitting device, area light source device, and display device - Google Patents

Light flux control member, light-emitting device, area light source device, and display device 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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WO
WIPO (PCT)
Prior art keywords
control member
flux control
light
luminous flux
light emitting
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Application number
PCT/JP2020/038351
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French (fr)
Japanese (ja)
Inventor
俊彦 持田
悠生 藤井
Original Assignee
株式会社エンプラス
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Publication of WO2021070948A1 publication Critical patent/WO2021070948A1/en

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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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Abstract

The present invention pertains to the provision of a light flux control member capable of suppressing uneven luminance even when used in a thin area light source device. The present invention provides a light flux control member for controlling distribution of light emitted from a light-emitting element, said member having a light entrance surface arranged so as to intersect with a central axis at the back side thereof, multiple first ridges arranged so as to surround the central axis at the front side, and a light exit surface arranged so as to surround the multiple first ridges at the front side, wherein the multiple first ridges are radially arranged with respect to the central axis in a plan view of the light flux control member.

Description

光束制御部材、発光装置、面光源装置および表示装置Luminous flux control member, light emitting device, surface light source device and display device
　本発明は、発光素子から出射された光の配光を制御する光束制御部材に関する。また、本発明は、前記光束制御部材を有する発光装置、前記発光装置を有する面光源装置、および前記面光源装置を有する表示装置に関する。 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.
　液晶表示装置などの透過型画像表示装置では、バックライトとして直下型の面光源装置を使用することがある。近年、光源として複数の発光素子を有する、直下型の面光源装置が使用されるようになってきている。 In a transmissive image display device such as a liquid crystal display device, a direct type surface light source device may be used as a backlight. In recent years, a direct type surface light source device having a plurality of light emitting elements has been used as a light source.
　たとえば、直下型の面光源装置は、基板、複数の発光素子、複数の光束制御部材（レンズ）および光拡散部材を有する。複数の発光素子は、基板上にマトリックス状に配置されている。各発光素子の上には、各発光素子から出射された光を基板の面方向に拡げる光束制御部材が配置されている。光束制御部材から出射された光は、光拡散部材（例えば光拡散板）により拡げられ、被照射部材（例えば液晶パネル）を面状に照らす。 For example, 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.
　図１は、特許文献１に示されている従来の光束制御部材の構成を示す断面図である。この図に示されるように、従来の光束制御部材２０は、発光素子１０から出射された光を入射する入射面２２と、入射面２２から入射した光を外部に出射する出射面２４とを有する。入射面２２は、発光素子１０に対して凹形状の面であり、発光素子１０と対向するように配置されている。また、光束制御部材２０の中心軸ＣＡの近傍においては、出射面２４も、凹形状の面である。この光束制御部材２０は、入射面２２および出射面２４において、発光素子１０から出射された光を発光素子１０の光軸（光束制御部材２０の中心軸ＣＡ）から離れる方向に屈折させることで、発光素子１０から出射された光を基板の面方向に拡げる。 FIG. 1 is a cross-sectional view showing the configuration of a conventional luminous flux control member shown in Patent Document 1. As shown in this figure, 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.
特開２００９－４３６２８号公報JP-A-2009-43628
　図１に示されているような従来の光束制御部材２０では、光束制御部材２０の中心軸ＣＡの近傍において入射面２２および出射面２４を凹形状の面とすることで、発光素子１０から直上方向に出射された光を、発光素子１０の光軸（光束制御部材２０の中心軸ＣＡ）から離れる方向に屈折させている。光束制御部材２０と光拡散部材との間隔がある程度広い場合は、発光素子１０から直上方向に出射され、光束制御部材２０により制御された光は、発光素子１０の光軸（光束制御部材２０の中心軸ＣＡ）から離れた位置において光拡散部材に到達する。このため、従来の光束制御部材２０を含む面光源装置において、発光素子１０の近傍領域が過度に明るくなることが抑制される。 In the conventional light flux control member 20 as shown in FIG. 1, 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). When 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.
　しかしながら、近年、面光源装置の薄型化が求められている。面光源装置を薄型化するためには、光束制御部材２０と光拡散部材との間隔を非常に狭くする必要がある。このように光束制御部材２０と光拡散部材との間隔が非常に狭い場合、発光素子１０から直上方向に出射され、光束制御部材２０により制御された光は、発光素子１０の光軸（光束制御部材２０の中心軸ＣＡ）から離れる前に光拡散部材に到達してしまう。その結果、従来の光束制御部材２０を含む薄型の面光源装置では、発光素子１０の近傍領域が過度に明るくなり、輝度ムラが生じてしまう。 However, in recent years, there has been a demand for thinner surface light source devices. In order to reduce the thickness of the surface light source device, it is necessary to make the distance between the luminous flux control member 20 and the light diffusing member very narrow. When the distance between the luminous flux control member 20 and the light diffusing member 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. As a result, in the thin surface light source device including the conventional luminous flux control member 20, the region near the light emitting element 10 becomes excessively bright, and uneven brightness occurs.
　このように、従来の光束制御部材２０には、薄型の面光源装置に用いた場合に、輝度ムラが発生してしまうという問題があった。 As described above, the conventional luminous flux control member 20 has a problem that uneven brightness occurs when used in a thin surface light source device.
　本発明は、薄型の面光源装置に用いた場合であっても輝度ムラを抑制することができる光束制御部材を提供することを目的とする。 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.
　また、本発明は、この光束制御部材を有する発光装置、この発光装置を有する面光源装置、およびこの面光源装置を有する表示装置を提供することを目的とする。 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.
　本発明は、発光素子から出射された光の配光を制御する光束制御部材であって、前記光束制御部材の裏側において前記光束制御部材の中心軸と交わるように配置されている凹部の内面であって、前記発光素子から出射された光を前記光束制御部材の内部に入射させるための入射面と、前記光束制御部材の表側において前記中心軸を取り囲むように配置されており、前記入射面で入射した光の一部を反射させるための複数の第１凸条と、前記光束制御部材の表側において前記複数の第１凸条を取り囲むように配置されており、前記入射面で入射した光の一部を出射させるための出射面と、を有し、前記複数の第１凸条は、それぞれ、第１反射面、第２反射面、および前記第１反射面と前記第２反射面との交線である稜線を有しており、前記光束制御部材を平面視したときに、前記複数の第１凸条は、前記中心軸に対して放射状に配置されている。 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. A plurality of first ridges for reflecting a part of the incident light and a plurality of first ridges arranged so as to surround the plurality of first ridges on the front side of the luminous flux control member, and the light incident on the incident surface. It has an exit surface for emitting a part of the light, and 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.
　本発明の発光装置は、発光素子と、前記入射面が前記発光素子と対向するように配置されている、本発明の光束制御部材と、を有する。 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.
　本発明の面光源装置は、本発明の発光装置と、前記発光装置からの光を拡散させつつ透過させる光拡散部材と、を有する。 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.
　本発明の表示装置は、本発明の面光源装置と、前記面光源装置から出射される光を照射される表示部材と、を有する。 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.
　本発明によれば、輝度ムラが低減された薄型の面光源装置を提供することができる。 According to the present invention, it is possible to provide a thin surface light source device in which uneven brightness is reduced.
図１は、従来の光束制御部材の構成を示す断面図である。FIG. 1 is a cross-sectional view showing the configuration of a conventional luminous flux control member. 図２Ａ，Ｂは、実施の形態１に係る面光源装置の構成を示す図である。2A and 2B are diagrams showing the configuration of the surface light source device according to the first embodiment. 図３Ａ，Ｂは、実施の形態１に係る面光源装置の構成を示す断面図である。3A and 3B are cross-sectional views showing the configuration of the surface light source device according to the first embodiment. 図４は、図３Ｂの一部を拡大した部分拡大断面図である。FIG. 4 is a partially enlarged cross-sectional view of a part of FIG. 3B. 図５Ａ～Ｆは、実施の形態１に係る光束制御部材の構成を示す図である。5A to 5F are views showing the configuration of the luminous flux control member according to the first embodiment. 図６Ａ～Ｄは、実施の形態１に係る光束制御部材において、裏面に傾斜面がある場合の構成を示す図である。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. 図７Ａ～Ｄは、実施の形態１に係る光束制御部材において、裏面の傾斜面に複数の第２凸条がある場合の構成を示す図である。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. 図８Ａ～Ｃは、実施の形態１に係る面光源装置の１つの発光装置についての輝度分布の測定結果を示す図である。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. 図９Ａ～Ｆは、実施の形態２に係る光束制御部材の構成を示す図である。9A to 9F are views showing the configuration of the luminous flux control member according to the second embodiment. 図１０Ａ～Ｄは、実施の形態２に係る光束制御部材において、裏面に傾斜面がある場合の構成を示す図である。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. 図１１Ａ～Ｄは、実施の形態２に係る光束制御部材において、裏面の傾斜面に複数の凸条がある場合の構成を示す図である。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. 図１２Ａ～Ｃは、実施の形態２に係る面光源装置の１つの発光装置についての輝度分布の測定結果を示す図である。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.
　以下、本発明の実施の形態について、図面を参照して詳細に説明する。以下の説明では、本発明の面光源装置の代表例として、液晶表示装置のバックライトなどに適する面光源装置について説明する。これらの面光源装置１００は、面光源装置からの光を照射される表示部材（被照射部材）１０２（例えば液晶パネル）と組み合わせることで、表示装置１００’として使用されうる。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, as a typical example of the surface light source device of the present invention, 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.
　［実施の形態１］
　（面光源装置および発光装置の構成）
　図２～４は、実施の形態１に係る面光源装置の構成を示す図である。図２Ａは、平面図であり、図２Ｂは、正面図である。図３Ａは、図２Ｂに示されるＡ－Ａ線の断面図であり、図３Ｂは、図２Ａに示されるＢ－Ｂ線の断面図である。図４は、図３Ｂの一部を拡大した部分拡大断面図である。 [Embodiment 1]
(Structure of surface light source device and light emitting device)
2 to 4 are diagrams showing the configuration of the surface light source device according to the first embodiment. FIG. 2A is a plan view, and FIG. 2B is a front view. 3A is a cross-sectional view taken along the line AA shown in FIG. 2B, and 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.
　図２，３に示されるように、実施の形態１に係る面光源装置１００は、筐体１１０、複数の発光装置２００および光拡散部材１２０を有する。複数の発光装置２００は、筐体１１０の底板１１２上にマトリックス状に配置されている。底板１１２の内面は、拡散反射面として機能する。また、筐体１１０の天板１１４には、開口部が設けられている。光拡散部材１２０は、この開口部を塞ぐように配置されており、発光面として機能する。発光面の大きさは、特に限定されないが、例えば約４００ｍｍ×約７００ｍｍである。 As shown in FIGS. 2 and 3, the surface light source device 100 according to the first embodiment 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. Further, 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.
　図４に示されるように、複数の発光装置２００は、それぞれ基板２１０上に固定されている。複数の基板２１０は、それぞれ筐体１１０の底板１１２上の所定の位置に固定されている。複数の発光装置２００は、それぞれ発光素子２２０および光束制御部材３００を有している。 As shown in FIG. 4, 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.
　発光素子２２０は、面光源装置１００の光源であり、基板２１０上に実装されている。発光素子２２０は、例えば白色発光ダイオードなどの発光ダイオード（ＬＥＤ）である。 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.
　光束制御部材３００は、発光素子２２０から出射された光の配光を制御する拡散レンズであり、基板２１０上に固定されている。光束制御部材３００は、その中心軸ＣＡが発光素子２２０の光軸ＬＡに一致するように、発光素子２２０の上に配置されている（図５Ｂ参照）。なお、後述する光束制御部材３００の入射面３２０および出射面３３０はいずれも回転対称（円対称）であり、かつこれらの回転軸は一致する（図５参照）。この入射面３２０および出射面３３０の回転軸を「光束制御部材の中心軸ＣＡ」という。また、「発光素子の光軸ＬＡ」とは、発光素子２２０からの立体的な出射光束の中心の光線を意味する。発光素子２２０が実装された基板２１０と光束制御部材３００の裏面３５０との間には、発光素子２２０から発せられる熱を外部に逃がすための隙間が形成されている。 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". Further, the “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.
　光束制御部材３００は、一体成形により形成されている。光束制御部材３００の材料は、所望の波長の光を通過させ得る材料であれば特に限定されない。たとえば、光束制御部材３００の材料は、ポリメタクリル酸メチル（ＰＭＭＡ）やポリカーボネート（ＰＣ）、エポキシ樹脂（ＥＰ）などの光透過性樹脂、またはガラスである。 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. For example, 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.
　本実施の形態に係る面光源装置１００は、光束制御部材３００の構成に主たる特徴を有する。そこで、光束制御部材３００については、別途詳細に説明する。 The surface light source device 100 according to the present embodiment 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.
　光拡散部材１２０は、光拡散性を有する板状の部材であり、発光装置２００からの出射光を拡散させつつ透過させる。通常、光拡散部材１２０は、液晶パネルなどの被照射部材とほぼ同じ大きさである。たとえば、光拡散部材１２０は、ポリメタクリル酸メチル（ＰＭＭＡ）、ポリカーボネート（ＰＣ）、ポリスチレン（ＰＳ）、スチレン・メチルメタクリレート共重合樹脂（ＭＳ）などの光透過性樹脂により形成される。光拡散性を付与するため、光拡散部材１２０の表面に微細な凹凸が形成されているか、または光拡散部材１２０の内部にビーズなどの光拡散子が分散している。 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. Usually, the light diffusing member 120 has almost the same size as an irradiated member such as a liquid crystal panel. For example, 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). In order to impart light diffusivity, 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.
　本実施の形態に係る面光源装置１００では、各発光素子２２０から出射された光は、光束制御部材３００により光拡散部材１２０の広範囲を照らすように拡げられる。各光束制御部材３００から出射された光は、さらに光拡散部材１２０により拡散される。その結果、本実施の形態に係る面光源装置１００は、面状の被照射部材（例えば液晶パネル）を均一に照らすことができる。 In the surface light source device 100 according to the present embodiment, 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. As a result, 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).
　（光束制御部材の構成）
　図５Ａ～Ｄは、実施の形態１に係る光束制御部材３００の構成を示す図である。図５Ａは平面図であり、図５Ｂは図５ＡのＣ－Ｃ線に沿う断面図であり、図５Ｃは底面図であり、図５Ｄは正面図である。 (Structure of luminous flux control member)
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, and FIG. 5D is a front view.
　図５Ａ～Ｄに示されるように、光束制御部材３００は、凹部３１０、入射面３２０、出射面３３０、第１凸条３４０、裏面３５０、鍔部３７０および複数の脚部３８０を有する。 As shown in FIGS. 5A to 5D, 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.
　凹部３１０は、光束制御部材３００の裏側（発光素子２２０側）の中央部に形成されている。凹部３１０の内面は、入射面３２０として機能する。入射面３２０は、発光素子２２０（図４参照）から出射された光の大部分を、その進行方向を制御しつつ光束制御部材３００の内部に入射させる。したがって、光束制御部材３００は、入射面３２０が発光素子２２０と対向するように配置される。入射面３２０は、光束制御部材３００の中心軸ＣＡと交わり、中心軸ＣＡを軸として回転対称（円対称）である。凹部３１０の形状は、特に限定されないが、例えば半長球（楕円の長軸を回転軸として得られた回転楕円体を短軸に沿って２つに分割した形状）である。 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).
　出射面３３０は、光束制御部材３００の表側（光拡散部材１２０側）に、鍔部３７０から突出するように形成されている。出射面３３０は、光束制御部材３００内に入射した光を、進行方向を制御しつつ外部に出射させる。出射面３３０は、中心軸ＣＡを軸として回転対称（円対称）である。光束制御部材３００の表側の全体に複数の第１凸条３４０を配置するのではなく、光束制御部材３００の表側の一部に出射面３３０を配置することにより、適度に出射面３３０から光を出射させて、光束制御部材３００内に光が過度にこもることを防ぐことができるため、光束制御部材３００内の多重散乱に起因する直上領域の輝度ムラの発生を抑制することができる。 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. By arranging the exit surface 330 on a part of the front side of the luminous flux control member 300 instead of arranging the plurality of first protrusions 340 on the entire front side of the luminous flux control member 300, light can be appropriately emitted from the emission surface 330. Since it is possible to prevent the light from being excessively trapped in the luminous flux control member 300 by emitting light, it is possible to suppress the occurrence of luminance unevenness in the region directly above due to multiple scattering in the luminous flux control member 300.
　本実施の形態では、出射面３３０は、光束制御部材３００の表側において、中心軸ＣＡを中心とする所定範囲（中心軸ＣＡの近傍）に配置された第１出射面３３０ａと、後述する複数の第１凸条３４０が配置される領域を取り囲むように配置された第２出射面３３０ｂとを有する（図５Ａ、Ｂ参照）。本実施の形態では、第１出射面３３０ａは、光拡散部材１２０に対して凹形状の滑らかな曲面であるが、第１出射面３３０ａの形状はこれに限定されない。なお、第１出射面３３０ａは、無くてもよい。本実施の形態では、第２出射面３３０ｂは、光拡散部材１２０に対して凸形状の滑らかな曲面であるが、第２出射面３３０ｂの形状はこれに限定されない。 In the present embodiment, 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). In the present embodiment, 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. In the present embodiment, 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.
　複数の第１凸条３４０は、図５Ａに示されるように、光束制御部材３００の表側において、光束制御部材３００の中心軸ＣＡを取り囲むように、中心軸に対して放射状（回転対称）となるように配置されている。なお、ここで「中心軸ＣＡを取り囲むように配置」とは、中心軸ＣＡの周りを全周（３６０°）に亘って取り囲むように配置されることのみならず、中心軸ＣＡの周りを部分的に取り囲むことも含む。本実施の形態では、複数の第１凸条３４０は、第１出射面３３０ａを取り囲むように、第１出射面３３０ａと第２出射面３３０ｂとの間に配置されている。図５Ｅは、第１凸条３４０の拡大図であり、図５Ｆは図５ＥのＤ－Ｄ線に沿う断面図である。図５Ｅ、Ｆに示されるように、第１凸条３４０は、第１反射面３４１、第２反射面３４２、および第１反射面３４１と第２反射面との交線である稜線３４３を有し、第１凸条３４０の断面形状は、略三角形状である。光束制御部材３００内を進行し、第１反射面３４１に到達した光は、第１反射面３４１および第２反射面３４２で順次反射され、再度光束制御部材３００内を進行する。同様に、光束制御部材３００内を進行し、第２反射面３４２に到達した光は、第２反射面３４２および第１反射面３４１で順次反射され、再度光束制御部材３００内を進行する。これにより、複数の第１凸条３４０は、入射面３２０から入射した光の一部を反射させ、発光素子２２０（光束制御部材３００）の直上に光が抜けないようにする。複数の第１凸条３４０は、入射面から入射した光を、例えば裏面３５０に向けて反射させる。 As shown in FIG. 5A, 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. Here, "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. In the present embodiment, 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, and FIG. 5F is a cross-sectional view taken along the line DD of FIG. 5E. As shown in FIGS. 5E and 5F, 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. However, 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. Similarly, 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. As a result, 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.
　また、本実施の形態において、稜線３４３は、図５Ｂに示されるように、第１出射面３３０ａと第２出射面３３０ｂとを繋ぐ曲線である。また、本実施の形態において、第１反射面３４１および第２反射面３４２の幅は、図５Ｅに示されるように、第１凸条３４０の延在方向における中央付近において最大となり、光束制御部材３００の中心軸ＣＡ、外縁のそれぞれに向かうにつれて細くなる。したがって、第１凸条３４０の平面視形状は、第１反射面３４１と第２反射面３４２との間に第２出射面３３０ｂが入り込んだＶ字形状となる。一方、第１凸条３４０の断面積は、第１凸条３４０の延在方向における中央付近において最大となり、中心軸に向かうにつれて小さくなる。図５Ｆに示されるように、第１凸条３４０を断面視したときに、第１反射面３４１と第２反射面３４２とによって形成される角度θは、入射面３２０から入射した光を反射させて光束制御部材３００の直上に光が抜けることを抑制するという観点から、７５°～１３５°であることが好ましく、８５°～１２５°であることがさらに好ましい。 Further, in the present embodiment, the ridge line 343 is a curve connecting the first exit surface 330a and the second exit surface 330b, as shown in FIG. 5B. Further, in the present embodiment, 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. On the other hand, 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. As shown in FIG. 5F, when the first ridge 340 is viewed in cross section, the angle θ formed by the first reflecting surface 341 and the second reflecting surface 342 reflects the light incident from the incident surface 320. From the viewpoint of suppressing light from escaping directly above the luminous flux control member 300, the temperature is preferably 75 ° to 135 °, and more preferably 85 ° to 125 °.
　複数の第１凸条３４０は、その少なくとも一部が、光束制御部材３００を平面視したときに、中心軸ＣＡから光束制御部材３００（第１凸条３４０を除く部分）の最も高い部分までの範囲内に配置されることが好ましい。本実施の形態では、光束制御部材３００（第１凸条３４０を除く部分）の最も高い部分は、光束制御部材３００の中心軸ＣＡを取り囲む円形の稜線として存在する。この稜線は、複数の第１凸条３４０が配置されている領域と、第２出射面３３０ｂとの境界付近に存在する。複数の第１凸条３４０の大部分は、中心軸ＣＡとこの稜線との間に配置されている。さらに、具体的には、複数の第１凸条３４０は、中心軸ＣＡから光束制御部材の最も高い部分（稜線）までの範囲の表面積の３０％～１００％を覆うように配置されることが好ましい。また、上記のＶ字形状において、第１反射面３４１と第２反射面３４２と第２出射面３３０ｂとの交点が、光束制御部材３００の最も高い部分（稜線）付近にあることが好ましい（図５Ａ、Ｅ参照）。これによって、第１凸条３４０に到達した光を反射させて発光素子２２０（光束制御部材３００）の直上に光が抜けないようにすることができる。 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. In the present embodiment, 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. Further, specifically, 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).
　裏面３５０は、光束制御部材３００の裏側に位置し、凹部３１０の開口縁部から径方向に延在する平面である。裏面３５０は、発光素子２２０から出射された光のうち、入射面３２０から入射しなかった光を、光束制御部材３００内に入射させる。 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.
　鍔部３７０は、出射面３３０の外周部と裏面３５０の外周部との間に位置し、径方向外側に突出している。鍔部３７０の形状は、略円環状である。鍔部３７０は、必須の構成要素ではないが、鍔部３７０を設けることで、光束制御部材３００の取り扱いおよび位置合わせが容易になる。鍔部３７０の厚みは、特に限定されず、出射面３３０の必要面積や鍔部３７０の成形性などを考慮して決定される。 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. Although 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.
　複数の脚部３８０は、裏面３５０から突出している略円柱状の部材である。複数の脚部３８０は、発光素子２２０に対して適切な位置に光束制御部材３００を支持する。 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.
　光束制御部材３００は、裏側に反射部４５０を有していてもよい。図６Ａ～Ｄは、裏側に反射部４５０を有する第１変形例に係る光束制御部材３００の構成を示す図である。図６Ａは平面図であり、図６Ｂは図６ＡのＥ－Ｅ線に沿う断面図であり、図６Ｃは底面図であり、図６Ｄは正面図である。反射部４５０は、光束制御部材３００の裏側（発光素子２２０側）において、中心軸ＣＡおよび凹部３１０の開口部を取り囲むように円環状に配置されている。反射部４５０は、第１凸条３４０で反射して裏面３５０に向かう光を側方方向（中心軸ＣＡに対して径方向外側）に反射させるための傾斜面４５１を有する。 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, and 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).
　反射部４５０は、裏面３５０において、中心軸ＣＡを中心とする円環状の溝として形成されている（図６Ｃ参照）。中心軸ＣＡを含む断面における円環状の溝の断面形状は、略Ｖ字状である（図６Ｂ参照）。Ｖ字を形成する２つの面のうち内側の面は、中心軸ＣＡと略平行であるのに対し、外側の面は、中心軸ＣＡに対し所定の角度（例えば３０°）で傾いている傾斜面４５１である。 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). Of the two surfaces forming the V shape, 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.
　上述した外側の傾斜面４５１には、複数の第２凸条４４０（全反射プリズム）が形成されていてもよい。図７Ａ～Ｄは、複数の第２凸条４４０を有する第２変形例に係る光束制御部材３００の構成を示す図である。図７Ａは平面図であり、図７Ｂは図７ＡのＦ－Ｆ線に沿う断面図であり、図７Ｃは底面図であり、図７Ｄは正面図である。 A plurality of second ridges 440 (total reflection prisms) 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, and FIG. 7D is a front view.
　複数の第２凸条４４０は、底面視したときに、光束制御部材３００の中心軸ＣＡに対して放射状（回転対称）に配置されている。図７Ｃに示されるように各第２凸条４４０は、平面状の第３反射面４４１と、平面状の第４反射面４４２と、第３反射面４４１と第４反射面４４２との交線である稜線４４３とを有しており、全反射プリズムのように機能する（図７Ｃ参照）。図７Ｂに示されるように、第２凸条４４０の稜線４４３を含む仮想直線は、稜線４４３よりも表側（光拡散部材１２０側）の位置で中心軸ＣＡと交わる。すなわち、各第２凸条４４０は、裏側（発光素子２２０側）よりも表側（光拡散部材１２０側）の方が中心軸ＣＡに近づくように、中心軸ＣＡに対し所定の角度（例えば３０°）で傾いている。反射部４５０に到達した光は、いずれかの第２凸条４４０の２つの面（第３反射面４４１および第４反射面４４２）で順次反射して、側方方向に向かう光となる。反射部４５０で反射した光は、例えば第２出射面３３０ｂから出射される。 The plurality of second ridges 440 are arranged radially (rotationally symmetric) with respect to the central axis CA of the luminous flux control member 300 when viewed from the bottom. As shown in FIG. 7C, 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. That is, 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.
　反射部４５０の位置は特に限定されないが、第１凸条３４０で反射した光が多く到達する領域に反射部４５０が形成されていることが好ましい。第１凸条３４０で反射した光の到達位置は、第１凸条３４０の形状など様々な要因により変化するが、反射部４５０は、光束制御部材３００において、光束制御部材３００（第１凸条３４０を除く部分）で最も高い部分（前述の例では稜線）より外側（中心軸ＣＡから離れた位置）に配置されることが好ましい。 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).
　（面光源装置における輝度分布）
　図７に示される、傾斜面に複数の第２凸条４４０が形成されている反射部４５０を有する光束制御部材３００を有する面光源装置１００における、１つの発光装置２００についての輝度分布を測定した。また、比較のため、図１に示される従来の光束制御部材２０を有する面光源装置についても、１つの発光装置についての輝度分布を測定した。 (Brightness distribution in surface light source device)
The brightness distribution of one light emitting device 200 in the surface light source device 100 having the luminous flux control member 300 having the reflecting portion 450 in which a plurality of second protrusions 440 are formed on the inclined surface shown in FIG. 7 was measured. .. Further, for comparison, the brightness distribution of one light emitting device was also measured for the surface light source device having the conventional luminous flux control member 20 shown in FIG.
　今回の測定では、以下のようにパラメーターを設定した。
　（パラメーター）
　・発光素子２２０の発光面の１辺の長さ：２．９ｍｍ（対角線の長さ：約４．１ｍｍ）
　・光束制御部材３００の外径：φ１３ｍｍ
　・入射面３２０となる凹部３１０の開口径：φ４ｍｍ
　・光束制御部材３００と光拡散部材１２０の間隔：５ｍｍ、８ｍｍ、１０ｍｍ In this measurement, 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: φ13 mm
-Opening diameter of the recess 310 that serves as the incident surface 320: φ4 mm
-Space between the luminous flux control member 300 and the light diffusing member 120: 5 mm, 8 mm, 10 mm
　図８Ａ～Ｃは測定結果を示す。図８Ａは、光束制御部材３００と光拡散部材１２０の間隔が５ｍｍの場合の輝度分布を示し、図８Ｂは、光束制御部材３００と光拡散部材１２０の間隔が光学距離８ｍｍの場合の輝度分布を示し、図８Ｃは、光束制御部材３００と光拡散部材１２０の間隔が光学距離１０ｍｍの場合の輝度分布を示す。 Figures 8A to 8C show the measurement results. 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, and 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.
　図８Ａ～Ｃに示すように、実施の形態１に係る光束制御部材３００と従来の光束制御部材とを比べると、以下のような結果となった。すなわち、図８Ａに示されるように、光束制御部材３００と光拡散部材１２０の間隔が５ｍｍの場合は、中心輝度低下率は約２０％であり、半値幅増加量は約５ｍｍであった。図８Ｂに示されるように、光束制御部材３００と光拡散部材１２０の間隔が８ｍｍの場合は、中心輝度低下率は約６～７％であり、半値幅増加量は約１ｍｍであった。図８Ｃに示されるように、光束制御部材３００と光拡散部材１２０の間隔が１０ｍｍの場合は、中心輝度低下率は約０％であり、半値幅増加量は約０ｍｍであった。このように、実施の形態１に係る光束制御部材３００では、光束制御部材の直上付近に光が抜けることが抑制され、これは特に光束制御部材３００と光拡散部材１２０の間隔が短い場合に顕著であった。なお、本実施の形態のように光束制御部材３００の表側に第１凸条３４０を有するような構成は、発光素子２２０が大きく、凹部３１０の径が大きくなってしまい、入射面３２０に対する光の角度を制御しづらいときに、特に有用であると考えられる（図５Ｂ参照）。 As shown in 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. 8C, when the distance between the luminous flux control member 300 and the light diffusing member 120 was 10 mm, the central luminance decrease rate was about 0% and the half width increase amount was about 0 mm. As described above, in the light flux control member 300 according to the first embodiment, it is suppressed that light escapes in the vicinity immediately above the light flux control member, which is particularly remarkable when the distance between the light flux control member 300 and the light diffusion member 120 is short. Met. In the configuration in which the first convex ridge 340 is provided on the front side of the luminous flux control member 300 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. 5B).
　［実施の形態２］
　（面光源装置および発光装置の構成）
　実施の形態２に係る面光源装置および発光装置は、実施の形態１に係る光束制御部材３００の代わりに実施の形態２に係る光束制御部材５００を有する点において、図５～７に示される実施の形態１に係る面光源装置１００および発光装置２００と異なる。そこで、本実施の形態では、実施の形態２に係る光束制御部材５００についてのみ説明する。 [Embodiment 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.
　（光束制御部材の構成）
　図９Ａ～Ｄは、実施の形態２に係る光束制御部材５００の構成を示す図である。図９Ａは平面図であり、図９Ｂは図９ＡのＣ－Ｃ線に沿う断面図であり、図９Ｃは底面図であり、図９Ｄは正面図である。 (Structure of luminous flux control member)
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, and FIG. 9D is a front view.
　実施の形態２に係る光束制御部材５００は、第１凸条５４０の形状等が実施の形態１に係る光束制御部材３００と異なる。そこで、実施の形態２に係る光束制御部材５００では、実施の形態１と同様の構成要素には同一の符号を付して詳細な説明を省略する。 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.
　実施の形態２に係る光束制御部材５００の複数の第１凸条５４０は、図９Ａに示されるように、光束制御部材５００の表側において、中心軸ＣＡを取り囲むように、中心軸に対して放射状（回転対称）となるように配置されている。なお、ここで「中心軸ＣＡを取り囲むように配置」とは、中心軸ＣＡの周りを全周（３６０°）に亘って取り囲むように配置されることのみならず、中心軸ＣＡの周りを部分的に取り囲むことも含む。本実施の形態では、複数の第１凸条５４０は、第１出射面３３０ａを取り囲むように、第１出射面３３０ａと第２出射面３３０ｂとの間に配置されている。図９Ｅは、第１凸条５４０の拡大図であり、図９Ｆは図９ＥのＤ－Ｄ線に沿う断面図である。図９Ｅ、Ｆに示されるように、第１凸条５４０は、第１反射面５４１、第２反射面５４２、および第１反射面５４１と第２反射面との交線である稜線５４３を有し、第１凸条５４０の断面形状は略三角形状である。光束制御部材５００内を進行し、第１反射面５４１に到達した光は、第１反射面５４１および第２反射面５４２で順次反射され、再度光束制御部材５００内を進行する。同様に、光束制御部材５００内を進行し、第２反射面５４２に到達した光は、第２反射面５４２および第１反射面５４１で順次反射され、再度光束制御部材５００内を進行する。これにより、複数の第１凸条５４０は、入射面３２０から入射した光の一部を反射させ、発光素子２２０（光束制御部材５００）の直上に光が抜けないようにする。複数の第１凸条５４０は入射面から入射した光を、例えば裏面３５０に向けて反射させる。 As shown in FIG. 9A, the plurality of first protrusions 540 of the light flux control member 500 according to the second embodiment 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). Here, "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. In the present embodiment, 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. 9E is an enlarged view of the first ridge 540, and FIG. 9F is a cross-sectional view taken along the line DD of FIG. 9E. As shown in FIGS. 9E and 9F, 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. However, 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. Similarly, 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. As a result, 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.
　また、本実施の形態において、稜線５４３は、図９Ｂに示されるように、中心軸ＣＡから外縁に向かうにつれて、第１出射面３３０ａと第２出射面３３０ｂとを繋ぐ曲線より高い位置にある曲線となる。一方、第１反射面５４１および第２反射面５４２の下側の辺（レンズの裏側に近い辺）は、第１出射面３３０ａと第２出射面３３０ｂとを繋ぐ曲線にほぼ沿う曲線である。また、本実施の形態において、第１反射面５４１および第２反射面５４２の幅は、図９Ｅに示されるように、光束制御部材５００の中心軸から外縁に向かうにつれて太くなる。これにより、第１凸条５４０は平面視すると略三角形状である。第１凸条５４０の断面積は、第１凸条５４０の延在方向における外縁付近において最大となり、中心軸に向かうにつれて小さくなる。図９Ｆに示されるように、第１凸条５４０を断面視したときに、第１反射面５４１と第２反射面５４２とによって形成される角度θは、入射面３２０から入射した光を反射させて光束制御部材５００の直上に光が集中することを抑制するという観点から、７５°～１３５°であることが好ましく、８５°～１２５°であることがさらに好ましい。 Further, in the present embodiment, as shown in FIG. 9B, 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. On the other hand, 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. Further, in the present embodiment, 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. As a result, 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. As shown in FIG. 9F, when the first ridge 540 is viewed in cross section, the angle θ formed by the first reflecting surface 541 and the second reflecting surface 542 reflects the light incident from the incident surface 320. From the viewpoint of suppressing the concentration of light directly above the light flux control member 500, the temperature is preferably 75 ° to 135 °, and more preferably 85 ° to 125 °.
　複数の第１凸条５４０は、その少なくとも一部が、光束制御部材５００を平面視したときに、中心軸ＣＡから光束制御部材５００（第１凸条５４０を除く部分）の最も高い部分までの範囲内に配置されることが好ましい。本実施の形態では、光束制御部材５００（第１凸条５４０を除く部分）の最も高い部分は、光束制御部材５００の中心軸ＣＡを取り囲む円形の稜線として存在する。この稜線は、複数の第１凸条５４０が配置されている領域と、第２出射面３３０ｂとの境界付近に存在する。複数の第１凸条５４０の大部分は、中心軸ＣＡとこの稜線との間に配置されている。さらに、具体的には、複数の第１凸条５４０は、中心軸ＣＡから光束制御部材の最も高い部分（稜線）までの範囲の表面積の３０％～１００％を覆うように配置されることが好ましい。これによって、第１凸条５４０に到達した光を反射させて発光素子２２０（光束制御部材５００）の直上に光が抜けないようにすることができる。 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. In the present embodiment, 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. Further, specifically, 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).
　本実施の形態に係る光束制御部材５００の第１の変形例は、第１の実施の形態の第１の変形例と同様に、裏側に反射部４５０を有していてもよく、図１０Ａ～Ｄはこの場合の光束制御部材５００を示す。図１０Ａは、光束制御部材５００の平面図であり、図１０Ｂは図１０ＡのＤ－Ｄ線に沿う断面図であり、図１０Ｃは底面図であり、図１０Ｄは正面図である。 Similar to the first modification of the first embodiment, the first modification of the luminous flux control member 500 according to the present embodiment 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, and FIG. 10D is a front view.
　本実施の形態に係る光束制御部材５００の第２の変形例は、第１の実施の形態の第２の変形例と同様に、傾斜面において複数の第２凸条４４０（全反射プリズム）が形成されていてもよく、図１１Ａ～Ｄはこの場合の光束制御部材５００を示す。図１１Ａは平面図であり、図１１Ｂは図１１ＡのＢ－Ｂ線に沿う断面図であり、図１１Ｃは底面図であり、図１１Ｄは正面図である。 In the second modification of the luminous flux control member 500 according to the present embodiment, similarly to the second modification of the first embodiment, a plurality of second protrusions 440 (total reflection prisms) are provided on the inclined surface. It may be formed, and 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, and FIG. 11D is a front view.
　（面光源装置における輝度分布）
　図１１に示される、傾斜面に複数の第２凸条４４０が形成されている反射部４５０を有する光束制御部材５００を有する面光源装置における、１つの発光装置２００についての輝度分布を測定した。また、比較のため、図１に示される従来の光束制御部材２０を有する面光源装置についても、１つの発光装置についての輝度分布を測定した。測定の各パラメーターは、実施の形態１と同じである。 (Brightness distribution in surface light source device)
The brightness distribution of one light emitting device 200 in the surface light source device having the luminous flux control member 500 having the reflecting portion 450 in which a plurality of second protrusions 440 are formed on the inclined surface shown in FIG. 11 was measured. Further, for comparison, the brightness distribution of one light emitting device was also measured for the surface light source device having the conventional luminous flux control member 20 shown in FIG. Each parameter of the measurement is the same as in the first embodiment.
　図１２Ａ～Ｃは測定結果を示す。図１２Ａは、光束制御部材５００と光拡散部材１２０の間隔が５ｍｍの場合の輝度分布を示し、図１２Ｂは、光束制御部材５００と光拡散部材１２０の間隔が８ｍｍの場合の輝度分布を示し、図１２Ｃは、光束制御部材５００と光拡散部材１２０の間隔が１０ｍｍの場合の輝度分布を示す。 Figures 12A to 12C show the measurement results. 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, and 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.
　図１２Ａ～Ｃに示すように、実施の形態２に係る光束制御部材５００と従来の光束制御部材とを比べると、以下のような結果となった。すなわち、図１２Ａに示されるように、光束制御部材５００と光拡散板１２０の間隔が５ｍｍの場合は、中心輝度低下率は約２０％であり、半値幅増加量は約５ｍｍであった。図１２Ｂに示されるように、光束制御部材５００と光拡散板１２０の間隔が８ｍｍの場合は、中心輝度低下率は約６～７％であり、半値幅増加量は約１ｍｍであった。図１２Ｃに示されるように、光束制御部材５００と光拡散板１２０の間隔が１０ｍｍの場合は、中心輝度低下率は約０％であり、半値幅増加量は約０ｍｍであった。このように、実施の形態２に係る光束制御部材５００でも、光束制御部材の直上付近に光が抜けることが抑制され、これは特に光束制御部材５００と光拡散部材１２０の間隔が短い場合に顕著であった。なお、本実施の形態のように光束制御部材５００の表側に第１凸条５４０を有するような構成は、発光素子２２０が大きく、凹部３１０の径が大きくなってしまい、入射面３２０に対する光の角度を制御しづらいときに、特に有用であると考えられる（図９Ｂ参照）。 As shown in 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. 12C, when the distance between the luminous flux control member 500 and the light diffusing plate 120 was 10 mm, the central luminance decrease rate was about 0% and the half width increase amount was about 0 mm. As described above, even in the luminous flux control member 500 according to the second embodiment, 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. Met. In the configuration in which 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).
　本出願は、２０１９年１０月１１日出願の特願２０１９－１８８０５１に基づく優先権を主張する。当該出願明細書および図面に記載された内容は、すべて本願明細書に援用される。 This application claims priority based on Japanese Patent Application No. 2019-188051 filed on October 11, 2019. All the contents described in the application specification and drawings are incorporated in the specification of the present application.
　本発明の光束制御部材、発光装置および面光源装置は、例えば、液晶表示装置のバックライトや一般照明などに適用することができる。 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.
　１０　発光素子
　２０　光束制御部材
　２２　入射面
　２４　出射面
　１００　面光源装置
　１００’　表示装置
　１０２　表示部材（被照射部材）
　１１０　筐体
　１１２　底板
　１１４　天板
　１２０　光拡散部材
　２００　発光装置
　２１０　基板
　２２０　発光素子
　３００，５００　光束制御部材
　３１０　凹部
　３２０　入射面
　３３０　出射面
　３３０ａ　第１出射面
　３３０ｂ　第２出射面
　３４０、５４０　第１凸条
　３４１、５４１　第１反射面
　３４２、５４２　第２反射面
　３４３、４４３、５４３　稜線
　３５０　裏面
　３７０　鍔部
　３８０　脚部
　４４０　第２凸条
　４４１　第３反射面        
　４４２　第４反射面
　４５０　反射部
　４５１　傾斜面
　ＣＡ　中心軸
　ＬＡ　光軸 10 Light emitting element 20 Luminous flux control member 22 Incident surface 24 Exit surface 100 surface Light source device 100'Display device 102 Display member (irradiated member)
110 Housing 112 Bottom plate 114 Top plate 120 Light diffusing member 200 Light emitting device 210 Substrate 220 Light emitting element 300,500 Luminous flux control member 310 Recessed 320 Incident surface 330 Exit surface 330a First exit surface 330b Second emission surface 340, 540 First convex Articles 341, 541 1st reflective surface 342, 542 2nd reflective surface 343, 443, 543 Ridge line 350 Back surface 370 Collar 380 Leg 440 2nd convex strip 441 3rd reflective surface
442 4th reflecting surface 450 Reflecting part 451 Inclined surface CA Central axis LA Optical axis

Claims (7)

  1. 　発光素子から出射された光の配光を制御する光束制御部材であって、
    　前記光束制御部材の裏側において前記光束制御部材の中心軸と交わるように配置されている凹部の内面であって、前記発光素子から出射された光を前記光束制御部材の内部に入射させるための入射面と、
    　前記光束制御部材の表側において前記中心軸を取り囲むように配置されており、前記入射面で入射した光の一部を反射させるための複数の第１凸条と、
    　前記光束制御部材の表側において前記複数の第１凸条を取り囲むように配置されており、前記入射面で入射した光の一部を出射させるための出射面と、
    　を有し、
    　前記複数の第１凸条は、それぞれ、第１反射面、第２反射面、および前記第１反射面と前記第２反射面との交線である稜線を有しており、
    　前記光束制御部材を平面視したときに、前記複数の第１凸条は、前記中心軸に対して放射状に配置されている、
    　光束制御部材。     A luminous flux control member that controls the light distribution of light emitted from a light emitting element.
    An incident surface on the back side of the luminous flux control member, which is an inner surface of a recess arranged so as to intersect the central axis of the luminous flux control member, for incident light emitted from the light emitting element into the inside of the luminous flux control member. Face and
    A plurality of first ridges arranged so as to surround the central axis on the front side of the luminous flux control member and for reflecting a part of the light incident on the incident surface, and
    An emission surface, which is arranged so as to surround the plurality of first protrusions on the front side of the luminous flux control member and for emitting a part of the light incident on the incident surface,
    Have,
    The plurality of first ridges each have a first reflecting surface, a second reflecting surface, and a ridge line that is an intersection of the first reflecting surface and the second reflecting surface.
    When the luminous flux control member is viewed in a plan view, the plurality of first protrusions are arranged radially with respect to the central axis.
    Luminous flux control member.
  2. 　前記複数の第１凸条は、少なくとも、前記中心軸から、前記光束制御部材のうち前記複数の第１凸条を除く部分で最も高い部分までの範囲内に配置される、請求項１に記載の光束制御部材。 The first aspect of claim 1, wherein the plurality of first ridges are arranged at least within a range from the central axis to the highest portion of the luminous flux control member excluding the plurality of first ridges. Luminous flux control member.
  3. 　前記光束制御部材の裏側において前記中心軸を取り囲むように配置された、傾斜面を有する反射部をさらに有し、
    　前記反射部は、前記光束制御部材のうち前記複数の第１凸条を除く部分で最も高い部分より前記中心軸から離れた位置に配置される、
    　請求項２に記載の光束制御部材。     Further having a reflecting portion having an inclined surface arranged so as to surround the central axis on the back side of the luminous flux control member.
    The reflecting portion is arranged at a position distant from the central axis from the highest portion of the luminous flux control member excluding the plurality of first protrusions.
    The luminous flux control member according to claim 2.
  4. 　前記傾斜面には複数の第２凸条が配置され、
    　前記複数の第２凸条は、それぞれ、第３反射面、第４反射面、および前記第３反射面と前記第４反射面との交線である稜線を有しており、
    　前記光束制御部材を底面視したときに、前記複数の第２凸条は、前記中心軸に対して放射状に配置されている、
    　請求項３に記載の光束制御部材。     A plurality of second ridges are arranged on the inclined surface, and a plurality of second ridges are arranged.
    The plurality of second ridges each have a third reflecting surface, a fourth reflecting surface, and a ridge line that is an intersection of the third reflecting surface and the fourth reflecting surface.
    When the luminous flux control member is viewed from the bottom, the plurality of second ridges are arranged radially with respect to the central axis.
    The luminous flux control member according to claim 3.
  5. 　発光素子と、
    　前記入射面が前記発光素子と対向するように配置されている、請求項１～４のいずれか一項に記載の光束制御部材と、
    　を有する、発光装置。     Light emitting element and
    The luminous flux control member according to any one of claims 1 to 4, wherein the incident surface is arranged so as to face the light emitting element.
    A light emitting device.
  6. 　請求項５に記載の発光装置と、
    　前記発光装置からの光を拡散させつつ透過させる光拡散部材と、
    　を有する、面光源装置。     The light emitting device according to claim 5 and
    A light diffusing member that diffuses and transmits light from the light emitting device,
    A surface light source device.
  7. 　請求項６に記載の面光源装置と、
    　前記面光源装置から出射された光を照射される表示部材と、
    　を有する、表示装置。     The surface light source device according to claim 6 and
    A display member that is irradiated with light emitted from the surface light source device and
    Has a display device.
PCT/JP2020/038351 2019-10-11 2020-10-09 Light flux control member, light-emitting device, area light source device, and display device WO2021070948A1 (en)

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JP2019188051A JP2021064505A (en) 2019-10-11 2019-10-11 Luminous flux control member, light emitting device, surface light source device, and display device

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014022126A (en) * 2012-07-13 2014-02-03 Omron Corp Optical deflection element, lighted switch using the same, and surface light source device using the same
JP2014063718A (en) * 2012-08-27 2014-04-10 Enplas Corp Luminous flux control member, light-emitting device, surface light source device, and display apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014022126A (en) * 2012-07-13 2014-02-03 Omron Corp Optical deflection element, lighted switch using the same, and surface light source device using the same
JP2014063718A (en) * 2012-08-27 2014-04-10 Enplas Corp Luminous flux control member, light-emitting device, surface light source device, and display apparatus

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