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WO2021054377A1 - Light flux controlling member, light-emitting device, surface light source apparatus, and display apparatus - Google Patents

Light flux controlling member, light-emitting device, surface light source apparatus, and display apparatus Download PDF

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Publication number
WO2021054377A1
WO2021054377A1 PCT/JP2020/035147 JP2020035147W WO2021054377A1 WO 2021054377 A1 WO2021054377 A1 WO 2021054377A1 JP 2020035147 W JP2020035147 W JP 2020035147W WO 2021054377 A1 WO2021054377 A1 WO 2021054377A1
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WO
WIPO (PCT)
Prior art keywords
control member
flux control
luminous flux
light
optical surface
Prior art date
Application number
PCT/JP2020/035147
Other languages
French (fr)
Japanese (ja)
Inventor
将輝 野上
Original Assignee
株式会社エンプラス
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社エンプラス filed Critical 株式会社エンプラス
Publication of WO2021054377A1 publication Critical patent/WO2021054377A1/en

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Classifications

    • 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
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping 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 transmissive image display device such as a liquid crystal display device
  • a direct type surface light source device having a plurality of light emitting elements as a light source has been used in recent years.
  • Patent Document 1 discloses a lighting device used for a direct type surface light source device.
  • FIG. 1A is a perspective view of the lighting device 10 described in Patent Document 1
  • FIG. 1B is a cross-sectional view of the lighting device 10 described in Patent Document 1.
  • a plurality of optical modules 20 are arranged in a matrix (lattice), and support pins 30 are arranged between the optical modules 20. Has been done.
  • the optical module 20 has an LED 21 and a diffusing lens 22, and the diffusing lens 22 is arranged so as to cover the LED 21.
  • a diffuser plate is arranged on the lighting device 10 to diffuse the light from the optical module 20.
  • the support pin 30 is for supporting the diffuser plate when the diffuser plate is arranged on the lighting device 10. By supporting the diffuser plate arranged on the illumination device 10 by the support pin 30, a gap can be secured between the diffuser lens 22 and the diffuser plate. As a result, the diffuser plate and the diffuser lens 22 can be prevented from coming into contact with each other.
  • the support pins 30 provided between the optical modules 20 support the diffuser plate so that the diffuser plate and the diffuser lens 22 do not come into contact with each other.
  • the diffusing plate when the diffusing plate is bent, the diffusing lens 22 (luminous flux control member) and the diffusing plate (light diffusing plate) come into contact with each other, and the light from the light source cannot be diffused as desired. is there.
  • the distance between the optical module 20 and the diffuser plate (light diffuser plate) is required to be closer. In such a case, even if the diffuser plate (light diffuser plate) is slightly bent, the diffuser lens 22 (luminous flux control member) and the diffuser plate (light diffuser plate) may come into contact with each other.
  • the present invention has been made in view of the above circumstances, and a light flux control member capable of suppressing contact between the light diffuser plate and the optical surface of the light flux control member even when the light diffuser plate is bent is provided.
  • the purpose is to provide.
  • Another object of the present invention is to provide a light emitting device, a surface light source device, and a display device having the above-mentioned luminous flux control member.
  • the luminous flux control member is a luminous flux control member for controlling the light distribution of light emitted from a light emitting element, which is used in a surface light source device having a light diffuser plate, and is on the back side of the luminous flux control member.
  • the first optical surface for incident the light emitted from the light emitting element into the inside of the luminous flux control member and the front side of the luminous flux control member are arranged and incident on the first optical surface.
  • a second optical surface for transmitting or reflecting the light is transmitted, and a support protrusion for supporting the light diffusing plate, which is arranged on the front side of the luminous flux control member, and a back side of the luminous flux control member are arranged.
  • the leg portion closest to the support protrusion among the leg portions is arranged on a line passing through the support protrusion and the central axis.
  • the light emitting device includes a light emitting element and a light flux control member according to the present invention arranged on the light emitting element.
  • the surface light source device includes a light emitting device according to the present invention and a light diffusing plate that diffuses and transmits light emitted from the light emitting device, and the support protrusion is attached to the light diffusing plate. Are in contact.
  • the display device includes a surface light source device according to the present invention and a display member that is irradiated with light emitted from the surface light source device.
  • the present invention provides a luminous flux control member, a light emitting device, a surface light source device, and a display device capable of suppressing contact between the light diffusing plate and the optical surface of the luminous flux control member even when the light diffusing plate is bent. Can be provided.
  • FIG. 1A is a plan view showing the arrangement of the optical module and the support pin in the lighting device described in Patent Document 1
  • FIG. 1B is a cross section showing the arrangement of the optical module and the support pin in the lighting device described in Patent Document 1.
  • FIG. 2A is a plan view of the surface light source device according to the embodiment of the present invention
  • FIG. 2B is a front view of the surface light source device according to the embodiment of the present invention
  • 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 FIGS. 2A and 3A.
  • FIG. 4 is a partially enlarged cross-sectional view of a part of FIG. 3B.
  • 5A to 5D are diagrams for explaining the relationship between the distance A and the distance OD.
  • 6A to 6D are views showing the configuration of the luminous flux control member according to the first embodiment.
  • 7A to 7D are views showing a configuration in the light flux control member according to the first embodiment when the support protrusion is located closer to the central axis than the leg portion.
  • 8A to 8D are diagrams showing a configuration when there are two support protrusions in the luminous flux control member according to the first embodiment.
  • 9A to 9D are views showing the configuration of the luminous flux control member according to the second embodiment.
  • 10A to 10D are views showing a configuration in the high-speed control member according to the second embodiment when the support protrusion is located closer to the central axis than the leg portion.
  • 11A to 11D are diagrams showing a configuration when there are two support protrusions in the luminous flux control member according to the second embodiment.
  • FIG. 2A is a plan view of the surface light source device 100
  • FIG. 2B is a front view of the surface light source device 100
  • 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 FIGS. 2A and 3A
  • 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 plate 120. Further, as shown in FIG. 2B, the surface light source device 100 can be combined with a display member (irradiated member) 102 (shown by a broken line in FIG. 2B) such as a liquid crystal panel to form a display device 100'. Can be used.
  • a display member irradiated member 102
  • the plurality of light emitting devices 200 are arranged in a matrix on the inner surface 114 of the bottom plate 112 of the housing 110.
  • a reflective sheet that functions as a diffuse reflection surface may be arranged on the inner surface 114 of the bottom plate 112.
  • the light diffusing plate 120 is arranged on a plurality of light emitting devices 200 and functions as a light emitting surface.
  • the size of the light emitting surface is not particularly limited, but is, for example, about 809 mm ⁇ about 1439 mm.
  • the light emitting device 200 is fixed to the substrate 115 on the inner surface 114 of the bottom plate 112.
  • the light emitting device 200 includes a light emitting element 210 and a luminous flux control member 300.
  • the position and number of the legs 350 can be freely set in consideration of minimizing the optical influence on the light emitting surface of the surface light source device 100 and stably fixing the legs to the substrate 115. be able to.
  • the light emitting element 210 is a light source of the surface light source device 100.
  • the light emitting element 210 is, for example, a light emitting diode (LED) such as a white light emitting diode.
  • LED light emitting diode
  • the luminous flux control member 300 is arranged on the light emitting element 210 and controls the light distribution of the light emitted from the light emitting element 210.
  • the first optical surface 310 and the second optical surface 320 of the luminous flux control member 300 are rotationally symmetric, and their rotation axes coincide with each other. In the present embodiment, these rotation axes are referred to as "central axis CA of the luminous flux control member".
  • 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 is characterized by 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 plate 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 size of the light diffusing plate 120 is almost the same as the size of an irradiated member such as a liquid crystal panel.
  • the light diffusing plate 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
  • the light diffusing plate 120 has fine irregularities formed on the surface of the light diffusing plate 120 in order to impart light diffusing property, and light diffusing elements such as beads are dispersed inside the light diffusing plate 120. Something is known.
  • 5A to 5D show the relationship between the distance A between the substrate 115 on which the luminous flux control member 300 is arranged and the top of the second optical surface 320 and the distance OD between the substrate 115 and the light diffusing plate 120. ..
  • the distance A and the distance OD are not the distance between the centers but the distance.
  • the support projection 330 which will be described later, gradually becomes longer in the order of FIGS. 5A, B, C, and D, and the distance OD increases.
  • the distance A is the same.
  • OD 2A.
  • the distance A and the distance OD preferably satisfy OD ⁇ 2A as shown in FIGS. 5A to 5C.
  • OD ⁇ 2A As shown in FIGS. 5A to 5C, by setting OD ⁇ 2A, it is possible to reduce the uneven brightness due to the support projection 330 (FIGS. 5A to 5C).
  • FIG. 6A to 6D are views showing the configuration of the luminous flux control member 300 according to the present embodiment.
  • FIG. 6A is a plan view of the luminous flux control member 300.
  • FIG. 6B is a cross-sectional view of the luminous flux control member 300 along the line CC of FIG. 6A.
  • FIG. 6C is a bottom view of the luminous flux control member 300.
  • FIG. 6D is a right side view of the luminous flux control member 300.
  • the luminous flux control member 300 is arranged on the first optical surface 310 arranged on the back side of the luminous flux control member 300 and on the front side of the luminous flux control member 300, and is arranged on the front side of the first optical surface 310. It has a second optical surface 320 for transmitting or reflecting the light incident on the light flux control member 300, and a support protrusion 330 arranged on the front side of the luminous flux control member 300 for supporting the light diffusing plate 120.
  • the "front side” means the light diffusing plate 120 side
  • the "back side” means the bottom plate 112 side (light emitting element 210 side).
  • the luminous flux control member 300 also has a gate mark 340 arranged on a part of the outer peripheral portion of the luminous flux control member 300 and a leg portion 350 arranged on the back side of the luminous flux control member 300.
  • the first optical surface 310 is, for example, the inner surface of a substantially conical concave portion arranged on the back side so as to intersect the central axis CA of the luminous flux control member 300.
  • the first optical surface 310 functions as an incident surface that causes the light emitted from the light emitting element 210 to enter the luminous flux control member 300.
  • the first optical surface 310 is configured such that most of the incident light is directed toward the second optical surface 320.
  • the second optical surface 320 is arranged on the front side so as to intersect the central axis CA, for example.
  • the second optical surface 320 is an exit surface for emitting the light incident on the first optical surface 310 to the outside of the luminous flux control member 300 while controlling the traveling direction.
  • the second optical surface 320 functions in cooperation with the first optical surface 310 to spread the light emitted from the light emitting element 210.
  • the support projection 330 is arranged on the front side of the luminous flux control member 300, and supports the light diffusing plate 120 in the surface light source device 100. That is, the support projection 330 is in contact with the light diffusing plate 120 in the surface light source device 100 (see FIG. 4). As shown in FIG. 6B, the maximum height of the support projection 330 is higher than the maximum height of the second optical surface 320 in the direction (front and back directions) of the central axis CA of the luminous flux control member 300. As a result, even when the light diffusing plate 120 is bent, it is possible to prevent the light diffusing plate 120 from coming into contact with the second optical surface 320 of the luminous flux control member 300.
  • the position of the support projection 330 is not particularly limited as long as the support projection 330 can support the light diffusing plate 120.
  • the support projection 330 may be entirely or partially arranged on the second optical surface 320 or a second. It is arranged on the outer edge of the optical surface 320 or outside the second optical surface 320.
  • the support projection 330 is arranged on the outer edge of the second optical surface 320 or outside the second optical surface 320 from the viewpoint of arranging the support projection 330 at a position that does not impair the optical function of the luminous flux control member 300. It is preferable to be arranged.
  • the support projection 330 is arranged on the second optical surface 320. It is more preferable that the two optical surfaces 320 are arranged closer to the maximum height position, and even more preferably the second optical surface 320 is arranged at the maximum height position.
  • the support projection 330 is arranged outside the second optical surface 320 of the luminous flux control member 300 in the direction orthogonal to the central axis CA.
  • the second optical surface 320 is arranged so as to cover a part of the outer edge of the second optical surface 320.
  • the support projection 330 is arranged on a flange portion arranged on the side of the second optical surface 320. Further, as shown in FIG.
  • the plurality of light emitting devices 200 are arranged so that the positions of the support projections 330 are irregular. As a result, it is possible to suppress the occurrence of uneven brightness caused by the support projection 330.
  • the support protrusion 330 is preferably arranged as follows in relation to the gate mark 340 described later. That is, it is preferable that the support projection 330 is arranged on the opposite side of the gate mark 340 with respect to the virtual plane including the central axis orthogonal to the perpendicular line drawn from the gate mark 340 with respect to the central axis.
  • the support projection 330 and the gate mark 340 which may impair the luminous flux control function, can be arranged apart from each other in the luminous flux control member 300, and it is possible to suppress the occurrence of uneven brightness. ..
  • the support protrusion 330 is preferably arranged as follows from the relationship with the leg portion 350 described later. That is, it is preferable that the support projection 330 is arranged at a position closer to the central axis CA than the leg portion 350 when viewed in a plan view. By arranging in this way, the weight of the light diffusing plate 120 is applied to the support projection 330, and the luminous flux control member 300 is tilted to prevent the leg portion 350 and the substrate 115 from being peeled off. Can be done.
  • 7A to 7D show an example when the support protrusion 330 is arranged closer to the central axis CA than the leg portion 350.
  • 7A to 7D show a plan view, a cross-sectional view, a bottom view, and a right side view of the luminous flux control member, respectively.
  • 7A to 7D show a case where the support projection 330 is on the central axis CA.
  • the shape of the support protrusion 330 is not particularly limited as long as it can support the light diffusing plate 120, but it is preferable that the shape does not impair the optical function of the luminous flux control member 300.
  • the shape of the support protrusion 330 is a truncated cone. The part with the support protrusion tends to be a bright part. Therefore, when the support protrusion portion protrudes from the outer periphery of the light flux control member when viewed in a plan view, it is preferable to design the shape of the protruding support protrusion outer edge so that the light does not concentrate. ..
  • the number of support protrusions 330 is not particularly limited, but is preferably small from the viewpoint of not impairing the function of the luminous flux control member 300. In the present embodiment, the number of support protrusions 330 is one from the above viewpoint.
  • the number of support protrusions 330 suppresses the adhesion between the legs 350 and the substrate 115 from being peeled off due to the weight of the light diffusing plate 120 being applied to one support protrusion 330 and the light flux control member 300 being tilted. From the viewpoint of doing so, it is preferable that there are a plurality of them. In this case, the number of support protrusions 330 is, for example, two, three, four, or five.
  • 8A to 8D show a case where the luminous flux control member 300 according to the first embodiment has two support protrusions 330.
  • 8A to 8D show a plan view, a cross-sectional view, a bottom view, and a right side view of the luminous flux control member, respectively.
  • the support protrusions 330 are evenly arranged on the circumference centered on the central axis CA so that the weight of the light diffusing plate 120 is uniformly applied to the support protrusions 330. It is preferable (see FIG. 8A).
  • the size of the support projection 330 is not particularly limited as long as the light diffusing plate 120 can be supported so that the light diffusing plate 120 does not come into contact with the second optical surface 320, and is appropriately set according to the thickness required for the surface light source device 100 and the like. sell.
  • the length (h) from the maximum height of the second optical surface 320 to the maximum height of the support projection 330 is, for example, about 0.01 mm to 10 mm, and 0.05 mm to 0.05 mm. It is preferably about 2 mm (see FIG. 6B).
  • the height of the support protrusion 330 is preferably set so as to satisfy the above OD ⁇ 2A (see FIGS. 5A to 5D).
  • the gate mark 340 remains on the luminous flux control member 300 because the luminous flux control member 300 is manufactured by injection molding.
  • the gate mark 340 is formed on the outer peripheral portion of the luminous flux control member 300.
  • the gate trace 340 and the support projection 330 are preferably arranged so as to sandwich the central axis CA. By arranging in this way, the gate trace 340 and the support projection 330, which may not be able to orient the light in a desired direction, can be arranged apart from each other in the luminous flux control member 300, and uneven brightness can be suppressed. ..
  • the leg portion 350 is provided on the back side of the luminous flux control member 300 in order to fix the luminous flux control member 300 to the substrate 115 in order to position the luminous flux control member 300 at an appropriate position with respect to the light emitting element 210. From the viewpoint of stably supporting the luminous flux control member 300, it is preferable that the luminous flux control member 300 is provided with a plurality of legs 350. In this embodiment, as shown in FIG. 6C, three legs 350 are provided on the back side of the luminous flux control member 300.
  • At least one of the leg portions 350 is arranged between the support protrusion 330 and the central axis CA. That is, the leg portion 350 closest to the support protrusion 330 when viewed in a plan view is arranged on a line passing through the support protrusion 330 and the central axis CA (see FIG. 6C).
  • the weight of the light diffusing plate 120 is applied to the support projection 330, and the luminous flux control member 300 is tilted to prevent the leg portion 350 and the substrate 115 from being peeled off. Can be done.
  • the luminous flux control member 300 has the support projection 330. Therefore, in the surface light source device 100, the support projection 330 can support the light diffusing plate 120 at a position close to the second optical surface 320, and even if the light diffusing plate 120 bends, the light diffusing plate 120 and the second optical surface It is possible to further prevent contact with the 320. By this.
  • the light diffusing plate 120 and the luminous flux control member 300 (second optical surface 320) can be brought closer to each other, and the surface light source device 100 can be made thinner.
  • Emodiment 2 (Structure of surface light source device and light emitting device)
  • the surface light source device 100 according to the first embodiment only in that the surface light source device according to the second embodiment has the light flux control member 400 according to the second embodiment instead of the light flux control member 300 according to the first embodiment. Different from. Therefore, in the present embodiment, only the luminous flux control member 400 according to the second embodiment will be described.
  • FIG. 9A to 9D are views showing the configuration of the luminous flux control member 400 according to the present embodiment.
  • FIG. 9A is a plan view of the luminous flux control member 400.
  • 9B is a cross-sectional view of the luminous flux control member 400 along the line DD of FIG. 9A.
  • FIG. 9C is a bottom view of the luminous flux control member 400.
  • FIG. 9D is a right side view of the luminous flux control member 400.
  • the luminous flux control member 400 includes a first optical surface 410 arranged on the back side of the luminous flux control member 400 and a second optical surface 420 arranged on the front side of the luminous flux control member 400. It has a third optical surface 460 arranged so as to surround the central axis CA and the second optical surface 420, and a support projection 430.
  • the "front side” means the light diffusing plate 120 side
  • the "back side” means the bottom plate 112 side (light emitting element 210 side).
  • the luminous flux control member 400 also has a gate mark 440 arranged on a part of the outer peripheral portion of the luminous flux control member 400 and a leg portion 450 arranged on the back side of the luminous flux control member 400.
  • the first optical surface 410 is, for example, the inner surface of a substantially conical concave portion arranged on the back side so as to intersect the central axis CA of the luminous flux control member 400.
  • the first optical surface 410 functions as an incident surface that causes the light emitted from the light emitting element 210 to enter the luminous flux control member 400.
  • the first optical surface 410 is configured such that most of the incident light is directed toward the second optical surface 420.
  • the second optical surface 420 is arranged on the front side so as to intersect the central axis CA, for example.
  • the second optical surface 420 is a reflecting surface for reflecting the light incident on the first optical surface 410 toward the side (third optical surface 460 side).
  • the third optical surface 460 is arranged so as to surround the second optical surface 420.
  • the third optical surface 460 is an exit surface that emits the light reflected by the second optical surface 420 to the outside of the luminous flux control member 400.
  • the third optical surface 460 is a side surface connecting the outer edge of the back surface of the luminous flux control member 400 and the outer edge of the front surface.
  • the third optical surface 460 emits the light reflected by the second optical surface 420 laterally (in a direction away from the central axis CA of the luminous flux control member 400).
  • the support projection 430 is arranged on the front side of the luminous flux control member 400, and supports the light diffusing plate 120 in the surface light source device. That is, the support projection 430 is in contact with the light diffusing plate 120 in the surface light source device 100. As shown in FIG. 9B, the maximum height of the support projection 430 is higher than the maximum height of the second optical surface 420 in the direction (front and back directions) of the central axis CA of the luminous flux control member 400. As a result, even when the light diffusing plate 120 is bent, it is possible to prevent the light diffusing plate 120 from coming into contact with the second optical surface 420 of the luminous flux control member 400.
  • the position of the support projection 430 is not particularly limited as long as the support projection 430 can support the light diffusing plate 120.
  • the support projection 430 may be entirely or partially arranged on the second optical surface 420 or may have a second support projection 430. It is arranged on the outer edge of the optical surface 420 or outside the second optical surface.
  • the support projection 430 is preferably arranged outside the second optical surface 420 from the viewpoint of arranging the support projection 430 at a position that does not impair the optical function of the luminous flux control member 400.
  • the support projection 430 is arranged outside the second optical surface 420 of the luminous flux control member 400 in the direction orthogonal to the central axis CA. As a result, it is possible to prevent the support projection 430 from impairing the luminous flux control function of the second optical surface 420.
  • the support projection 430 is arranged outside the second optical surface 420, it is preferable that the support projection 430 is arranged on a flange portion arranged on the side of the second optical surface 420.
  • the plurality of light emitting devices 200 are arranged so that the positions of the support protrusions 430 are irregular (see FIG. 3A). As a result, it is possible to suppress the occurrence of uneven brightness caused by the support projection 430.
  • the support protrusion 430 is preferably arranged as follows in relation to the gate mark 440 described later. That is, it is preferable that the support protrusion 430 is arranged on the opposite side of the gate mark 440 with respect to the virtual plane including the central axis orthogonal to the perpendicular line drawn from the gate mark 440 with respect to the central axis.
  • the support projection 430 and the gate mark 440 which may impair the luminous flux control function, can be arranged apart from each other in the luminous flux control member 400, and it is possible to suppress the occurrence of uneven brightness. ..
  • the support protrusion 430 is preferably arranged as follows from the relationship with the leg portion 450 described later. That is, it is preferable that the support protrusion 430 is arranged at a position closer to the central axis CA than the leg portion 450 when viewed in a plan view. By arranging in this way, it is possible to prevent the light flux control member 400 from being peeled off due to the weight of the light diffusing plate 120 being applied to the support projection 430 and the light flux control member 400 being tilted. Can be done.
  • FIGS. 10A to 10D show an example when the support protrusion 430 is arranged at a position closer to the central axis CA than the leg portion 450.
  • 10A to 10D show a plan view, a cross-sectional view, a bottom view, and a right side view of the luminous flux control member, respectively.
  • 10A to 10D show a case where the support projection 430 is on the central axis CA.
  • the shape of the support protrusion 430 is not particularly limited as long as it can support the light diffusing plate 120, but it is preferable that the shape does not impair the optical function of the luminous flux control member 400.
  • the shape of the support protrusion 430 is a truncated cone.
  • the number of support protrusions 430 is not particularly limited, but is preferably small from the viewpoint of not impairing the function of the luminous flux control member 400. In the present embodiment, the number of support protrusions 430 is one from the above viewpoint.
  • the number of support protrusions 430 suppresses the adhesion between the leg portion 450 and the substrate 115 from being peeled off due to the weight of the light diffusing plate 120 being applied to one support protrusion 430 and the light flux control member 400 being tilted. From the viewpoint of doing so, it is preferable that there are a plurality of them. In this case, the number of support protrusions 430 is, for example, two, three, four, or five.
  • 11A to 11D show a case where the luminous flux control member 400 according to the second embodiment has two support protrusions 430.
  • 11A to 11D show a plan view, a cross-sectional view, a bottom view, and a right side view of the luminous flux control member, respectively.
  • the support protrusions 430 are evenly arranged on the circumference centered on the central axis CA so that the weight of the light diffusing plate 120 is uniformly applied to the support protrusions 430. It is preferable (see FIG. 11A).
  • the size of the support projection 430 is not particularly limited as long as the light diffusing plate 120 can be supported so that the light diffusing plate 120 does not come into contact with the second optical surface 420, and is appropriately set according to the thickness required for the surface light source device 100 and the like. sell.
  • the length (h) from the maximum height of the second optical surface 420 to the maximum height of the support projection 430 is, for example, about 0.01 mm to 10 mm, and 0.05 mm to 0.05 mm. It is preferably about 2 mm (see FIG. 9B).
  • the distance between the substrate 115 on which the luminous flux control member 400 is arranged and the top of the second optical surface 420 is defined as the distance A
  • the distance between the substrate 115 and the light diffusing plate 120 is defined as the distance OD.
  • the height of the support protrusion 430 is preferably set so as to satisfy the above OD ⁇ 2A (see FIGS. 5A to 5D).
  • the gate mark 440 remains in the luminous flux control member 400 because the luminous flux control member 400 is manufactured by injection molding.
  • the gate mark 440 is formed on the outer peripheral portion of the luminous flux control member 400.
  • the gate trace 440 and the support protrusion 430 are preferably arranged so as to sandwich the central axis CA. By arranging in this way, the gate trace 440 and the support projection 430, which may not be able to orient the light in a desired direction, can be arranged apart from each other in the luminous flux control member 400, and uneven brightness can be suppressed. ..
  • the leg portion 450 is provided on the back side of the luminous flux control member 400 in order to position the luminous flux control member 400 at an appropriate position with respect to the light emitting element 210.
  • three legs 450 are provided on the back side of the luminous flux control member 400.
  • At least one of the legs 450 is arranged between the support protrusion 430 and the central axis CA. That is, the leg portion 450 closest to the support protrusion 430 when viewed in a plan view is arranged on a line passing through the support protrusion 430 and the central axis CA (see FIG. 9C).
  • the surface light source device according to the present embodiment has the same effect as the surface light source device 100 according to the first embodiment.
  • the luminous flux control member, light emitting device, surface light source device, and display device according to the present invention can be applied to, for example, a backlight of a liquid crystal display device, general lighting, and the like.
  • Lighting device 20
  • Optical module 21 LED 22
  • Diffusing lens 30
  • Support pin 100
  • Surface light source device 100'Display device
  • Display member (irradiated member) 110 Housing 112
  • Bottom plate 114
  • Inner surface 115
  • Substrate 120
  • Light diffusing plate (light emitting surface) 200
  • Light emitting device 210
  • Light emitting element 300 400
  • Luminous flux control member 310
  • Support protrusion 340, 440 Gate mark 350 450 Leg 460
  • Third optical surface CA CA Central axis

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Abstract

The present invention addresses the problem of providing a light flux controlling member capable of preventing a light diffusion plate and an optical surface of the light flux controlling member from coming into contact with each other even when the light diffusion plate has warped. This light flux controlling member comprises: a first optical surface that is disposed on the back side of the light flux controlling member in order to make light emitted from the light-emitting element incident on the inside of the light flux controlling member; a second optical surface that is disposed on the front side of the light flux controlling member in order to transmit or reflect the light incident from the first optical surface; a support projection that is disposed on the front side of the light flux controlling member in order to support the light diffusion plate; and a plurality of leg portions that are disposed on the back side of the light flux controlling member. In the direction of the central axis of the light flux controlling member, the maximum height of the support projection is higher than the maximum height of the second optical surface, and when seen in plan view, the leg portion closest to the support projection among the plurality of leg portions is disposed on a line passing the support projection and the central axis.

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、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ている。 In a transmissive image display device such as a liquid crystal display device, a direct type surface light source device having a plurality of light emitting elements as a light source has been used in recent years.
　たとえば、特許文献１は、直下型の面光源装置に使用される照明装置を開示している。図１Ａは特許文献１に記載の照明装置１０の斜視図であり、図１Ｂは特許文献１に記載の照明装置１０の断面図である。 For example, Patent Document 1 discloses a lighting device used for a direct type surface light source device. FIG. 1A is a perspective view of the lighting device 10 described in Patent Document 1, and FIG. 1B is a cross-sectional view of the lighting device 10 described in Patent Document 1.
　図１Ａに示されているように、特許文献１に記載の照明装置１０では、複数の光モジュール２０がマトリックス状（格子状）に配置されており、光モジュール２０の間に支持ピン３０が配置されている。 As shown in FIG. 1A, in the lighting device 10 described in Patent Document 1, a plurality of optical modules 20 are arranged in a matrix (lattice), and support pins 30 are arranged between the optical modules 20. Has been done.
　また、図１Ｂに示されているように、光モジュール２０は、ＬＥＤ２１および拡散レンズ２２を有し、拡散レンズ２２はＬＥＤ２１を覆うように配置されている。 Further, as shown in FIG. 1B, the optical module 20 has an LED 21 and a diffusing lens 22, and the diffusing lens 22 is arranged so as to cover the LED 21.
　照明装置１０の上には拡散板が配置され、光モジュール２０からの光を拡散させる。支持ピン３０は、照明装置１０の上に拡散板が配置されたときに拡散板を支持するためのものである。支持ピン３０が、照明装置１０の上に配置される拡散板を支持することにより、拡散レンズ２２と拡散板との間に隙間を確保することができる。これにより、拡散板と拡散レンズ２２とが接触しないようにすることができる。 A diffuser plate is arranged on the lighting device 10 to diffuse the light from the optical module 20. The support pin 30 is for supporting the diffuser plate when the diffuser plate is arranged on the lighting device 10. By supporting the diffuser plate arranged on the illumination device 10 by the support pin 30, a gap can be secured between the diffuser lens 22 and the diffuser plate. As a result, the diffuser plate and the diffuser lens 22 can be prevented from coming into contact with each other.
国際公開第２０１０／１４６８９５号International Publication No. 2010/146895
　上記のように、特許文献１に記載の照明装置１０では、光モジュール２０の間に設けられた支持ピン３０が拡散板を支持し、拡散板と拡散レンズ２２とが接触しないようにしている。しかしながら、この支持方法では拡散板が撓んだ場合に、拡散レンズ２２（光束制御部材）と拡散板（光拡散板）とが接触してしまい、光源からの光を所望通りに拡散できないことがある。特に、照明装置１０をより薄型化することが求められた場合、光モジュール２０と拡散板（光拡散板）との距離をより近づけることが求められる。このような場合、拡散板（光拡散板）が少し撓んだだけでも、拡散レンズ２２（光束制御部材）と拡散板（光拡散板）とが接触してしまうことがある。 As described above, in the lighting device 10 described in Patent Document 1, the support pins 30 provided between the optical modules 20 support the diffuser plate so that the diffuser plate and the diffuser lens 22 do not come into contact with each other. However, in this support method, when the diffusing plate is bent, the diffusing lens 22 (luminous flux control member) and the diffusing plate (light diffusing plate) come into contact with each other, and the light from the light source cannot be diffused as desired. is there. In particular, when the lighting device 10 is required to be thinner, the distance between the optical module 20 and the diffuser plate (light diffuser plate) is required to be closer. In such a case, even if the diffuser plate (light diffuser plate) is slightly bent, the diffuser lens 22 (luminous flux control member) and the diffuser plate (light diffuser plate) may come into contact with each other.
　本発明は、上記事情に鑑みてなされたものであり、光拡散板が撓んだ場合でも、光拡散板と光束制御部材の光学面とが接触すること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。 The present invention has been made in view of the above circumstances, and a light flux control member capable of suppressing contact between the light diffuser plate and the optical surface of the light flux control member even when the light diffuser plate is bent is provided. The purpose is to provide.
　また、本発明は、上記の光束制御部材を有する発光装置、面光源装置および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, a surface light source device, and a display device having the above-mentioned luminous flux control member.
　本発明に係る光束制御部材は、光拡散板を有する面光源装置に用いられる、発光素子から出射された光の配光を制御するための光束制御部材であって、前記光束制御部材の裏側に配置されており、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第１光学面と、前記光束制御部材の表側に配置されており、前記第１光学面で入射した光を透過または反射させるための第２光学面と、前記光束制御部材の表側に配置されており、前記光拡散板を支持するための支持突起と、前記光束制御部材の裏側に配置された複数の脚部と、を有し、前記光束制御部材の中心軸の方向において、前記支持突起の最大高さは、前記第２光学面の最大高さより高く、平面視したときに、前記複数の脚部のうち前記支持突起に最も近い前記脚部は、前記支持突起および前記中心軸を通る線上に配置されている。 The luminous flux control member according to the present invention is a luminous flux control member for controlling the light distribution of light emitted from a light emitting element, which is used in a surface light source device having a light diffuser plate, and is on the back side of the luminous flux control member. The first optical surface for incident the light emitted from the light emitting element into the inside of the luminous flux control member and the front side of the luminous flux control member are arranged and incident on the first optical surface. A second optical surface for transmitting or reflecting the light is transmitted, and a support protrusion for supporting the light diffusing plate, which is arranged on the front side of the luminous flux control member, and a back side of the luminous flux control member are arranged. It has a plurality of legs, and the maximum height of the support protrusion is higher than the maximum height of the second optical surface in the direction of the central axis of the luminous flux control member. The leg portion closest to the support protrusion among the leg portions is arranged on a line passing through the support protrusion and the central axis.
　本発明に係る発光装置は、発光素子と、前記発光素子上に配置された本発明に係る光束制御部材と、を有する。 The light emitting device according to the present invention includes a light emitting element and a light flux control member according to the present invention arranged on the light emitting element.
　本発明に係る面光源装置は、本発明に係る発光装置と、前記発光装置から出射された光を拡散させつつ透過させる光拡散板と、を有し、前記支持突起は、前記光拡散板に接触している。 The surface light source device according to the present invention includes a light emitting device according to the present invention and a light diffusing plate that diffuses and transmits light emitted from the light emitting device, and the support protrusion is attached to the light diffusing plate. Are in contact.
　本発明に係る表示装置は、本発明に係る面光源装置と、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。 The display device according to the present invention includes a surface light source device according to the present invention and a display member that is irradiated with light emitted from the surface light source device.
　本発明は、光拡散板が撓んだ場合でも、光拡散板と光束制御部材の光学面とが接触することを抑制することができる光束制御部材、発光装置、面光源装置、および表示装置を提供することができる。 The present invention provides a luminous flux control member, a light emitting device, a surface light source device, and a display device capable of suppressing contact between the light diffusing plate and the optical surface of the luminous flux control member even when the light diffusing plate is bent. Can be provided.
図１Ａは、特許文献１に記載の照明装置における光モジュールと支持ピンの配置を示す平面図であり、図１Ｂは、特許文献１に記載の照明装置の光モジュールと支持ピンの配置を示す断面図である。FIG. 1A is a plan view showing the arrangement of the optical module and the support pin in the lighting device described in Patent Document 1, and FIG. 1B is a cross section showing the arrangement of the optical module and the support pin in the lighting device described in Patent Document 1. It is a figure. 図２Ａは、本発明の実施の形態に係る面光源装置の平面図であり、図２Ｂは、本発明の実施の形態に係る面光源装置の正面図である。FIG. 2A is a plan view of the surface light source device according to the embodiment of the present invention, and FIG. 2B is a front view of the surface light source device according to the embodiment of the present invention. 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および図３Ａに示されるＢ－Ｂ線の断面図である。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 FIGS. 2A and 3A. 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～Ｄは、距離Ａと距離ＯＤとの関係を説明するための図である。5A to 5D are diagrams for explaining the relationship between the distance A and the distance OD. 図６Ａ～Ｄ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。6A to 6D are views showing the configuration of the luminous flux control member according to the first embodiment. 図７Ａ～Ｄは、実施の形態１に係る光束制御部材において、支持突起が脚部より中心軸に近い位置に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 the support protrusion is located closer to the central axis than the leg portion. 図８Ａ～Ｄは、実施の形態１に係る光束制御部材において、２つの支持突起がある場合の構成を示す図である。8A to 8D are diagrams showing a configuration when there are two support protrusions in the luminous flux control member according to the first embodiment. 図９Ａ～Ｄ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 9D 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に係る高速制御部材において、支持突起が脚部より中心軸に近い位置にある場合の構成を示す図である。10A to 10D are views showing a configuration in the high-speed control member according to the second embodiment when the support protrusion is located closer to the central axis than the leg portion. 図１１Ａ～Ｄは、実施の形態２に係る光束制御部材において、２つの支持突起がある場合の構成を示す図である。11A to 11D are diagrams showing a configuration when there are two support protrusions in the luminous flux control member 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。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
　［実施の形態１］
　（面光源装置および発光装置の構成）
　図２Ａ～図４は、本発明の実施の形態１に係る面光源装置１００の構成を示す図である。図２Ａは、面光源装置１００の平面図であり、図２Ｂは面光源装置１００の正面図である。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および図３Ａ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)
2A to 4 are views showing the configuration of the surface light source device 100 according to the first embodiment of the present invention. FIG. 2A is a plan view of the surface light source device 100, and FIG. 2B is a front view of the surface light source device 100. 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 FIGS. 2A and 3A. FIG. 4 is a partially enlarged cross-sectional view of a part of FIG. 3B.
　図２Ａ、２Ｂ、３Ａおよび３Ｂに示されるように、本実施の形態に係る面光源装置１００は、筐体１１０、複数の発光装置２００および光拡散板１２０を有する。また、図２Ｂに示されるように、面光源装置１００は、液晶パネルなどの表示部材（被照射部材）１０２（図２Ｂにおいて、破線で示している）と組み合わせることで、表示装置１００’としても使用できる。 As shown in FIGS. 2A, 2B, 3A and 3B, the surface light source device 100 according to the present embodiment includes a housing 110, a plurality of light emitting devices 200, and a light diffusing plate 120. Further, as shown in FIG. 2B, the surface light source device 100 can be combined with a display member (irradiated member) 102 (shown by a broken line in FIG. 2B) such as a liquid crystal panel to form a display device 100'. Can be used.
　図３Ａに示されるように、複数の発光装置２００は、筐体１１０の底板１１２の内面１１４上にマトリックス状に配置されている。ここで、底板１１２の内面１１４には、拡散反射面として機能する反射シートが配置されていてもよい。図３Ｂに示されているように光拡散板１２０は、複数の発光装置２００の上に配置されており、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８０９ｍｍ×約１４３９ｍｍである。 As shown in FIG. 3A, the plurality of light emitting devices 200 are arranged in a matrix on the inner surface 114 of the bottom plate 112 of the housing 110. Here, a reflective sheet that functions as a diffuse reflection surface may be arranged on the inner surface 114 of the bottom plate 112. As shown in FIG. 3B, the light diffusing plate 120 is arranged on a plurality of light emitting devices 200 and functions as a light emitting surface. The size of the light emitting surface is not particularly limited, but is, for example, about 809 mm × about 1439 mm.
　図４に示されるように、発光装置２００は、底板１１２の内面１１４上の基板１１５に固定されている。発光装置２００は、発光素子２１０および光束制御部材３００を有している。脚部３５０の位置や数は、面光源装置１００の発光面への光学的な影響を最小限に抑制でき、かつ、基板１１５へ安定的に固定されるように考慮の上、自由に設定することができる。 As shown in FIG. 4, the light emitting device 200 is fixed to the substrate 115 on the inner surface 114 of the bottom plate 112. The light emitting device 200 includes a light emitting element 210 and a luminous flux control member 300. The position and number of the legs 350 can be freely set in consideration of minimizing the optical influence on the light emitting surface of the surface light source device 100 and stably fixing the legs to the substrate 115. be able to.
　発光素子２１０は、面光源装置１００の光源である。発光素子２１０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 210 is a light source of the surface light source device 100. The light emitting element 210 is, for example, a light emitting diode (LED) such as a white light emitting diode.
　光束制御部材３００は、発光素子２１０の上に配置されており、発光素子２１０から出射された光の配光を制御する。なお、本実施の形態では、光束制御部材３００の第１光学面３１０および第２光学面３２０は、回転対称であり、かつこれらの回転軸は、一致する。本実施の形態では、これらの回転軸を「光束制御部材の中心軸ＣＡ」という。 The luminous flux control member 300 is arranged on the light emitting element 210 and controls the light distribution of the light emitted from the light emitting element 210. In the present embodiment, the first optical surface 310 and the second optical surface 320 of the luminous flux control member 300 are rotationally symmetric, and their rotation axes coincide with each other. In the present embodiment, these rotation axes are referred to as "central axis CA of the luminous flux control member".
　本実施の形態では、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、所望する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。 In the present embodiment, 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 is characterized by the configuration of the luminous flux control member 300. Therefore, the luminous flux control member 300 will be described in detail separately.
　光拡散板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、光拡散板１２０の大きさは、液晶パネルなどの被照射部材の大きさとほぼ同じである。たとえば、光拡散板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。光拡散板１２０としては、光拡散性を付与するため、光拡散板１２０の表面に微細な凹凸が形成されているものや、光拡散板１２０の内部にビーズなどの光拡散子が分散しているもの等が知られている。 The light diffusing plate 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 size of the light diffusing plate 120 is almost the same as the size of an irradiated member such as a liquid crystal panel. For example, the light diffusing plate 120 is formed of a light transmitting resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene (PS), and styrene / methyl methacrylate copolymer resin (MS). The light diffusing plate 120 has fine irregularities formed on the surface of the light diffusing plate 120 in order to impart light diffusing property, and light diffusing elements such as beads are dispersed inside the light diffusing plate 120. Something is known.
　図５Ａ～Ｄは光束制御部材３００が配置されている基板１１５と第２光学面３２０の頂部との間の距離Ａと、基板１１５と光拡散板１２０との間の距離ＯＤとの関係を示す。ここで、距離Ａおよび距離ＯＤは、中心間距離ではなく間隔である。図５Ａ、Ｂ、Ｃ、Ｄの順で徐々に後述する支持突起３３０が長くなり、距離ＯＤが増大する。一方、図５Ａ～Ｄにおいて、距離Ａは同一である。図５Ａ、Ｂでは、ＯＤ＜２Ａである。図５Ｃでは、ＯＤ＝２Ａである。図５Ｄでは、ＯＤ＞２Ａである。ここで、距離Ａと距離ＯＤは、図５Ａ～Ｃに示されるようにＯＤ≦２Ａを満たすことが好ましい。ＯＤ＞２Ａの場合（図５Ｄ）に比べて、ＯＤ≦２Ａとすることで、支持突起３３０による輝度ムラを低減することができる（図５Ａ～Ｃ）。 5A to 5D show the relationship between the distance A between the substrate 115 on which the luminous flux control member 300 is arranged and the top of the second optical surface 320 and the distance OD between the substrate 115 and the light diffusing plate 120. .. Here, the distance A and the distance OD are not the distance between the centers but the distance. The support projection 330, which will be described later, gradually becomes longer in the order of FIGS. 5A, B, C, and D, and the distance OD increases. On the other hand, in FIGS. 5A to 5D, the distance A is the same. In FIGS. 5A and 5B, OD <2A. In FIG. 5C, OD = 2A. In FIG. 5D, OD> 2A. Here, the distance A and the distance OD preferably satisfy OD ≦ 2A as shown in FIGS. 5A to 5C. Compared with the case of OD> 2A (FIG. 5D), by setting OD ≦ 2A, it is possible to reduce the uneven brightness due to the support projection 330 (FIGS. 5A to 5C).
　（光束制御部材の構成）
　図６Ａ～Ｄは、本実施の形態に係る光束制御部材３００の構成を示す図である。図６Ａは、光束制御部材３００の平面図である。図６Ｂは、図６Ａの線Ｃ－Ｃに沿う、光束制御部材３００の断面図である。図６Ｃは、光束制御部材３００の底面図である。図６Ｄは、光束制御部材３００の右側面図である。 (Structure of luminous flux control member)
6A to 6D are views showing the configuration of the luminous flux control member 300 according to the present embodiment. FIG. 6A is a plan view of the luminous flux control member 300. FIG. 6B is a cross-sectional view of the luminous flux control member 300 along the line CC of FIG. 6A. FIG. 6C is a bottom view of the luminous flux control member 300. FIG. 6D is a right side view of the luminous flux control member 300.
　図６Ａ～Ｄに示されるように、光束制御部材３００は、光束制御部材３００の裏側に配置された第１光学面３１０と、光束制御部材３００の表側に配置されており、第１光学面３１０で入射した光を透過または反射させるための第２光学面３２０と、光束制御部材３００の表側に配置されており、光拡散板１２０支持するための支持突起３３０と、を有する。ここで、「表側」とは、光拡散板１２０側を意味し、「裏側」とは、底板１１２側（発光素子２１０側）を意味する。また、本実施の形態では、光束制御部材３００は、光束制御部材３００の外周部の一部に配置されたゲート跡３４０と、光束制御部材３００の裏側に配置された脚部３５０も有する。 As shown in FIGS. 6A to 6D, the luminous flux control member 300 is arranged on the first optical surface 310 arranged on the back side of the luminous flux control member 300 and on the front side of the luminous flux control member 300, and is arranged on the front side of the first optical surface 310. It has a second optical surface 320 for transmitting or reflecting the light incident on the light flux control member 300, and a support protrusion 330 arranged on the front side of the luminous flux control member 300 for supporting the light diffusing plate 120. Here, the "front side" means the light diffusing plate 120 side, and the "back side" means the bottom plate 112 side (light emitting element 210 side). Further, in the present embodiment, the luminous flux control member 300 also has a gate mark 340 arranged on a part of the outer peripheral portion of the luminous flux control member 300 and a leg portion 350 arranged on the back side of the luminous flux control member 300.
　第１光学面３１０は、例えば、光束制御部材３００の中心軸ＣＡと交わるように裏側に配置された、略円錐状の凹部の内面である。第１光学面３１０は、発光素子２１０から出射された光を光束制御部材３００内に入射させる入射面として機能する。第１光学面３１０は、入射した光の大部分が第２光学面３２０に向かうように構成されている。 The first optical surface 310 is, for example, the inner surface of a substantially conical concave portion arranged on the back side so as to intersect the central axis CA of the luminous flux control member 300. The first optical surface 310 functions as an incident surface that causes the light emitted from the light emitting element 210 to enter the luminous flux control member 300. The first optical surface 310 is configured such that most of the incident light is directed toward the second optical surface 320.
　第２光学面３２０は、例えば、中心軸ＣＡと交わるように表側に配置される。本実施の形態では、第２光学面３２０は、第１光学面３１０で入射した光を進行方向を制御しつつ光束制御部材３００の外部に出射させるための出射面である。第２光学面３２０は、第１光学面３１０と協働して、発光素子２１０から出射された光を拡げるように機能する。 The second optical surface 320 is arranged on the front side so as to intersect the central axis CA, for example. In the present embodiment, the second optical surface 320 is an exit surface for emitting the light incident on the first optical surface 310 to the outside of the luminous flux control member 300 while controlling the traveling direction. The second optical surface 320 functions in cooperation with the first optical surface 310 to spread the light emitted from the light emitting element 210.
　支持突起３３０は、光束制御部材３００の表側に配置されており、面光源装置１００において光拡散板１２０を支持する。すなわち、支持突起３３０は、面光源装置１００において光拡散板１２０に接触している（図４参照）。図６Ｂに示されているように、光束制御部材３００の中心軸ＣＡの方向（表裏方向）において、支持突起３３０の最大高さは、第２光学面３２０の最大高さより高い。これにより、光拡散板１２０が撓んだ場合でも、光拡散板１２０と光束制御部材３００の第２光学面３２０とが接触することを防ぐことができる。 The support projection 330 is arranged on the front side of the luminous flux control member 300, and supports the light diffusing plate 120 in the surface light source device 100. That is, the support projection 330 is in contact with the light diffusing plate 120 in the surface light source device 100 (see FIG. 4). As shown in FIG. 6B, the maximum height of the support projection 330 is higher than the maximum height of the second optical surface 320 in the direction (front and back directions) of the central axis CA of the luminous flux control member 300. As a result, even when the light diffusing plate 120 is bent, it is possible to prevent the light diffusing plate 120 from coming into contact with the second optical surface 320 of the luminous flux control member 300.
　支持突起３３０の位置は、支持突起３３０が光拡散板１２０を支持できれば特に制限されないが、例えば、支持突起３３０は、その全部もしくは一部が第２光学面３２０上に配置されるか、第２光学面３２０の外縁に配置されるか、または第２光学面３２０より外側に配置される。これらの内、支持突起３３０は、光束制御部材３００の光学的機能を損なわない位置に配置するという観点から、第２光学面３２０の外縁に配置されるか、または第２光学面３２０より外側に配置されることが好ましい。一方、第２光学面３２０と光拡散板１２０との接触をより抑制するという観点からは、支持突起３３０は、その全部または一部が第２光学面３２０上に配置されることが好ましく、第２光学面３２０の最大高さ位置により近い位置に配置されることがより好ましく、第２光学面３２０の最大高さ位置に配置されることがさらにより好ましい。 The position of the support projection 330 is not particularly limited as long as the support projection 330 can support the light diffusing plate 120. For example, the support projection 330 may be entirely or partially arranged on the second optical surface 320 or a second. It is arranged on the outer edge of the optical surface 320 or outside the second optical surface 320. Among these, the support projection 330 is arranged on the outer edge of the second optical surface 320 or outside the second optical surface 320 from the viewpoint of arranging the support projection 330 at a position that does not impair the optical function of the luminous flux control member 300. It is preferable to be arranged. On the other hand, from the viewpoint of further suppressing the contact between the second optical surface 320 and the light diffusing plate 120, it is preferable that all or part of the support projection 330 is arranged on the second optical surface 320. It is more preferable that the two optical surfaces 320 are arranged closer to the maximum height position, and even more preferably the second optical surface 320 is arranged at the maximum height position.
　本実施の形態では、支持突起３３０は、中心軸ＣＡに直交する方向において、光束制御部材３００の第２光学面３２０より外側に配置されている。あるいは、図６Ａに示されるように、第２光学面３２０の外縁の一部にかかるように配置されているとも言える。これにより、支持突起３３０が第２光学面３２０の光束制御機能を損なうことが抑制される。なお、支持突起３３０が第２光学面３２０より外側に配置される場合、支持突起３３０は第２光学面３２０の側方に配置された鍔部（フランジ）上に配置されることが好ましい。また、図３Ａに示されているように、面光源装置１００を平面視したとき、複数の発光装置２００は、支持突起３３０の位置が不規則になるように配置されることが好ましい。これにより、支持突起３３０に起因する輝度ムラが生じることを抑制することができる。　　　　 In the present embodiment, the support projection 330 is arranged outside the second optical surface 320 of the luminous flux control member 300 in the direction orthogonal to the central axis CA. Alternatively, as shown in FIG. 6A, it can be said that the second optical surface 320 is arranged so as to cover a part of the outer edge of the second optical surface 320. As a result, it is possible to prevent the support projection 330 from impairing the luminous flux control function of the second optical surface 320. When the support projection 330 is arranged outside the second optical surface 320, it is preferable that the support projection 330 is arranged on a flange portion arranged on the side of the second optical surface 320. Further, as shown in FIG. 3A, when the surface light source device 100 is viewed in a plan view, it is preferable that the plurality of light emitting devices 200 are arranged so that the positions of the support projections 330 are irregular. As a result, it is possible to suppress the occurrence of uneven brightness caused by the support projection 330.
　また、支持突起３３０は、後述するゲート跡３４０との関係から以下のように配置されることが好ましい。すなわち、支持突起３３０はゲート跡３４０から中心軸に対してひいた垂線に対して直交する中心軸を含む仮想平面に対して、ゲート跡３４０の反対側に配置されていることが好ましい。このように配置されることで、光束制御機能を損なうことがある支持突起３３０とゲート跡３４０とを光束制御部材３００において離して配置させることができ、輝度ムラが生じることを抑制することができる。 Further, the support protrusion 330 is preferably arranged as follows in relation to the gate mark 340 described later. That is, it is preferable that the support projection 330 is arranged on the opposite side of the gate mark 340 with respect to the virtual plane including the central axis orthogonal to the perpendicular line drawn from the gate mark 340 with respect to the central axis. By arranging in this way, the support projection 330 and the gate mark 340, which may impair the luminous flux control function, can be arranged apart from each other in the luminous flux control member 300, and it is possible to suppress the occurrence of uneven brightness. ..
　また、支持突起３３０は、後述する脚部３５０との関係からは以下のように配置されることが好ましい。すなわち、支持突起３３０は、平面視したときに脚部３５０より中心軸ＣＡにより近い位置に配置されることが好ましい。このように配置されることで、光拡散板１２０の重さが支持突起３３０にかかって光束制御部材３００が傾くことで、脚部３５０と基板１１５との接着がはがれてしまうことを抑制することができる。 Further, the support protrusion 330 is preferably arranged as follows from the relationship with the leg portion 350 described later. That is, it is preferable that the support projection 330 is arranged at a position closer to the central axis CA than the leg portion 350 when viewed in a plan view. By arranging in this way, the weight of the light diffusing plate 120 is applied to the support projection 330, and the luminous flux control member 300 is tilted to prevent the leg portion 350 and the substrate 115 from being peeled off. Can be done.
　図７Ａ～Ｄは、支持突起３３０が、脚部３５０より中心軸ＣＡにより近い位置に配置されるときの一例を示す。図７Ａ～Ｄは、それぞれ、光束制御部材の平面図、断面図、底面図、右側面図を示している。なお、図７Ａ～Ｄは、支持突起３３０が中心軸ＣＡ上にある場合を示している。 7A to 7D show an example when the support protrusion 330 is arranged closer to the central axis CA than the leg portion 350. 7A to 7D show a plan view, a cross-sectional view, a bottom view, and a right side view of the luminous flux control member, respectively. 7A to 7D show a case where the support projection 330 is on the central axis CA.
　支持突起３３０の形状は、光拡散板１２０を支持できれば特に制限されないが、光束制御部材３００の光学的機能を損なわない形状であることが好ましい。本実施の形態では、支持突起３３０の形状は、円錐台である。支持突起のある部分は、明部になりやすい。このため、平面視した時に支持突起部分が光束制御部材外周より飛び出ている場合には、飛び出ている支持突起外縁の形状を、光が集光してしまわないような形状に設計することが好ましい。 The shape of the support protrusion 330 is not particularly limited as long as it can support the light diffusing plate 120, but it is preferable that the shape does not impair the optical function of the luminous flux control member 300. In this embodiment, the shape of the support protrusion 330 is a truncated cone. The part with the support protrusion tends to be a bright part. Therefore, when the support protrusion portion protrudes from the outer periphery of the light flux control member when viewed in a plan view, it is preferable to design the shape of the protruding support protrusion outer edge so that the light does not concentrate. ..
　支持突起３３０の数は、特に制限されないが、光束制御部材３００の機能を損なわない観点からは少ないことが好ましい。本実施の形態では、上記の観点から、支持突起３３０の数は１つである。 The number of support protrusions 330 is not particularly limited, but is preferably small from the viewpoint of not impairing the function of the luminous flux control member 300. In the present embodiment, the number of support protrusions 330 is one from the above viewpoint.
　一方、支持突起３３０の数は、光拡散板１２０の重さが１つの支持突起３３０にかかって光束制御部材３００が傾くことで、脚部３５０と基板１１５との接着がはがれてしまうことを抑制するという観点からは、複数であることが好ましい。この場合、支持突起３３０の数は、具体的には、例えば、２つ、３つ、４つ、５つである。 On the other hand, the number of support protrusions 330 suppresses the adhesion between the legs 350 and the substrate 115 from being peeled off due to the weight of the light diffusing plate 120 being applied to one support protrusion 330 and the light flux control member 300 being tilted. From the viewpoint of doing so, it is preferable that there are a plurality of them. In this case, the number of support protrusions 330 is, for example, two, three, four, or five.
　図８Ａ～Ｄは、実施の形態１に係る光束制御部材３００において、２つの支持突起３３０がある場合を示す。図８Ａ～Ｄは、それぞれ、光束制御部材の平面図、断面図、底面図、右側面図を示す。 8A to 8D show a case where the luminous flux control member 300 according to the first embodiment has two support protrusions 330. 8A to 8D show a plan view, a cross-sectional view, a bottom view, and a right side view of the luminous flux control member, respectively.
　支持突起３３０の数が複数の場合、支持突起３３０は、光拡散板１２０の重さが各支持突起３３０に均一にかかるように、中心軸ＣＡを中心とする円周上に均等に配置されることが好ましい（図８Ａ参照）。 When the number of the support protrusions 330 is plurality, the support protrusions 330 are evenly arranged on the circumference centered on the central axis CA so that the weight of the light diffusing plate 120 is uniformly applied to the support protrusions 330. It is preferable (see FIG. 8A).
　支持突起３３０の大きさは、光拡散板１２０が第２光学面３２０に接触しないように光拡散板１２０を支持できれば特に制限されず、面光源装置１００に求められる厚みなどに応じて適宜設定されうる。中心軸ＣＡの方向（表裏方向）において、第２光学面３２０の最大高さから支持突起３３０の最大高さまでの長さ（ｈ）は、例えば０．０１ｍｍ～１０ｍｍ程度であり、０．０５ｍｍ～２ｍｍ程度が好ましい（図６Ｂ参照）。また、支持突起３３０の高さは、上記のＯＤ≦２Ａを満たすように設定されることが好ましい（図５Ａ～Ｄ参照）。 The size of the support projection 330 is not particularly limited as long as the light diffusing plate 120 can be supported so that the light diffusing plate 120 does not come into contact with the second optical surface 320, and is appropriately set according to the thickness required for the surface light source device 100 and the like. sell. In the direction of the central axis CA (front and back directions), the length (h) from the maximum height of the second optical surface 320 to the maximum height of the support projection 330 is, for example, about 0.01 mm to 10 mm, and 0.05 mm to 0.05 mm. It is preferably about 2 mm (see FIG. 6B). Further, the height of the support protrusion 330 is preferably set so as to satisfy the above OD ≦ 2A (see FIGS. 5A to 5D).
　ゲート跡３４０は、光束制御部材３００が射出成形で製造されることにより、光束制御部材３００に残るものである。本実施の形態では、ゲート跡３４０は、光束制御部材３００の外周部に形成されている。図６Ａに示されているように、光束制御部材３００を平面視したときに、ゲート跡３４０および支持突起３３０は、中心軸ＣＡを挟むように配置されていることが好ましい。このように配置されることで、光を所望の方向へ配向できないことがあるゲート跡３４０と支持突起３３０とを光束制御部材３００において離して配置することができ、輝度ムラを抑制することができる。 The gate mark 340 remains on the luminous flux control member 300 because the luminous flux control member 300 is manufactured by injection molding. In the present embodiment, the gate mark 340 is formed on the outer peripheral portion of the luminous flux control member 300. As shown in FIG. 6A, when the luminous flux control member 300 is viewed in a plan view, the gate trace 340 and the support projection 330 are preferably arranged so as to sandwich the central axis CA. By arranging in this way, the gate trace 340 and the support projection 330, which may not be able to orient the light in a desired direction, can be arranged apart from each other in the luminous flux control member 300, and uneven brightness can be suppressed. ..
　脚部３５０は、発光素子２１０に対して光束制御部材３００を適切な位置に位置決めするために、光束制御部材３００を基板１１５に固定するために光束制御部材３００の裏側に設けられている。光束制御部材３００を安定して支持する観点からは、光束制御部材３００には複数の脚部３５０が設けられていることが好ましい。本実施の形態では、図６Ｃに示されているように、光束制御部材３００の裏側に３つの脚部３５０が設けられている。 The leg portion 350 is provided on the back side of the luminous flux control member 300 in order to fix the luminous flux control member 300 to the substrate 115 in order to position the luminous flux control member 300 at an appropriate position with respect to the light emitting element 210. From the viewpoint of stably supporting the luminous flux control member 300, it is preferable that the luminous flux control member 300 is provided with a plurality of legs 350. In this embodiment, as shown in FIG. 6C, three legs 350 are provided on the back side of the luminous flux control member 300.
　また、脚部３５０の少なくとも１つは支持突起３３０と中心軸ＣＡとの間に配置される。すなわち、平面視したときに支持突起３３０に最も近い脚部３５０は、支持突起３３０および中心軸ＣＡを通る線上に配置される（図６Ｃ参照）。このように配置されることで、光拡散板１２０の重さが支持突起３３０にかかって光束制御部材３００が傾くことで、脚部３５０と基板１１５との接着がはがれてしまうことを抑制することができる。 Further, at least one of the leg portions 350 is arranged between the support protrusion 330 and the central axis CA. That is, the leg portion 350 closest to the support protrusion 330 when viewed in a plan view is arranged on a line passing through the support protrusion 330 and the central axis CA (see FIG. 6C). By arranging in this way, the weight of the light diffusing plate 120 is applied to the support projection 330, and the luminous flux control member 300 is tilted to prevent the leg portion 350 and the substrate 115 from being peeled off. Can be done.
　（効果）
　以上のように、本実施の形態に係る光束制御部材３００は、支持突起３３０を有している。このため、面光源装置１００において、支持突起３３０が第２光学面３２０に近い位置で光拡散板１２０を支持することができ、光拡散板１２０が撓んでも光拡散板１２０と第２光学面３２０とが接触することをより防止することができる。これにより。光拡散板１２０と光束制御部材３００（第２光学面３２０）とをより近づけることができ、面光源装置１００をより薄くすることができる。 (effect)
As described above, the luminous flux control member 300 according to the present embodiment has the support projection 330. Therefore, in the surface light source device 100, the support projection 330 can support the light diffusing plate 120 at a position close to the second optical surface 320, and even if the light diffusing plate 120 bends, the light diffusing plate 120 and the second optical surface It is possible to further prevent contact with the 320. By this. The light diffusing plate 120 and the luminous flux control member 300 (second optical surface 320) can be brought closer to each other, and the surface light source device 100 can be made thinner.
　［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４００を有する点においてのみ、実施の形態１に係る面光源装置１００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４００についてのみ説明する。 [Embodiment 2]
(Structure of surface light source device and light emitting device)
The surface light source device 100 according to the first embodiment only in that the surface light source device according to the second embodiment has the light flux control member 400 according to the second embodiment instead of the light flux control member 300 according to the first embodiment. Different from. Therefore, in the present embodiment, only the luminous flux control member 400 according to the second embodiment will be described.
　（光束制御部材の構成）
　図９Ａ～Ｄは、本実施の形態に係る光束制御部材４００の構成を示す図である。図９Ａは、光束制御部材４００の平面図である。図９Ｂは、図９Ａの線Ｄ－Ｄに沿う、光束制御部材４００の断面図である。図９Ｃは、光束制御部材４００の底面図である。図９Ｄは、光束制御部材４００の右側面図である。 (Structure of luminous flux control member)
9A to 9D are views showing the configuration of the luminous flux control member 400 according to the present embodiment. FIG. 9A is a plan view of the luminous flux control member 400. 9B is a cross-sectional view of the luminous flux control member 400 along the line DD of FIG. 9A. FIG. 9C is a bottom view of the luminous flux control member 400. FIG. 9D is a right side view of the luminous flux control member 400.
　図９Ａ～Ｄに示されるように、光束制御部材４００は、光束制御部材４００の裏側に配置された第１光学面４１０と、光束制御部材４００の表側に配置された第２光学面４２０と、中心軸ＣＡおよび第２光学面４２０を取り囲むように配置された第３光学面４６０と、支持突起４３０とを有する。ここで、「表側」とは、光拡散板１２０側を意味し、「裏側」とは、底板１１２側（発光素子２１０側）を意味する。また、本実施の形態では、光束制御部材４００は、光束制御部材４００の外周部の一部に配置されたゲート跡４４０と、光束制御部材４００の裏側に配置された脚部４５０も有する。 As shown in FIGS. 9A to 9D, the luminous flux control member 400 includes a first optical surface 410 arranged on the back side of the luminous flux control member 400 and a second optical surface 420 arranged on the front side of the luminous flux control member 400. It has a third optical surface 460 arranged so as to surround the central axis CA and the second optical surface 420, and a support projection 430. Here, the "front side" means the light diffusing plate 120 side, and the "back side" means the bottom plate 112 side (light emitting element 210 side). Further, in the present embodiment, the luminous flux control member 400 also has a gate mark 440 arranged on a part of the outer peripheral portion of the luminous flux control member 400 and a leg portion 450 arranged on the back side of the luminous flux control member 400.
　第１光学面４１０は、たとえば、光束制御部材４００の中心軸ＣＡと交わるように裏側に配置された、略円錐状の凹部の内面である。第１光学面４１０は、発光素子２１０から出射された光を光束制御部材４００内に入射させる入射面として機能する。第１光学面４１０は、入射した光の大部分が第２光学面４２０に向かうように構成されている。 The first optical surface 410 is, for example, the inner surface of a substantially conical concave portion arranged on the back side so as to intersect the central axis CA of the luminous flux control member 400. The first optical surface 410 functions as an incident surface that causes the light emitted from the light emitting element 210 to enter the luminous flux control member 400. The first optical surface 410 is configured such that most of the incident light is directed toward the second optical surface 420.
　第２光学面４２０は、例えば、中心軸ＣＡと交わるように表側に配置される。本実施の形態では、第２光学面４２０は、第１光学面４１０で入射した光を側方（第３光学面４６０側）に向かって反射させるための反射面である。 The second optical surface 420 is arranged on the front side so as to intersect the central axis CA, for example. In the present embodiment, the second optical surface 420 is a reflecting surface for reflecting the light incident on the first optical surface 410 toward the side (third optical surface 460 side).
　第３光学面４６０は、第２光学面４２０を取り囲むように配置される。本実施の形態では、第３光学面４６０は、第２光学面４２０で反射した光を光束制御部材４００の外部に出射させる出射面である。第３光学面４６０は、光束制御部材４００の裏側の面の外縁と表側の面の外縁とを繋ぐ側面である。第３光学面４６０は、第２光学面４２０で反射した光を側方（光束制御部材４００の中心軸ＣＡから離れる方向）に出射する。 The third optical surface 460 is arranged so as to surround the second optical surface 420. In the present embodiment, the third optical surface 460 is an exit surface that emits the light reflected by the second optical surface 420 to the outside of the luminous flux control member 400. The third optical surface 460 is a side surface connecting the outer edge of the back surface of the luminous flux control member 400 and the outer edge of the front surface. The third optical surface 460 emits the light reflected by the second optical surface 420 laterally (in a direction away from the central axis CA of the luminous flux control member 400).
　支持突起４３０は、光束制御部材４００の表側に配置されており、面光源装置において光拡散板１２０を支持する。すなわち、支持突起４３０は、面光源装置１００において光拡散板１２０に接触している。図９Ｂに示されているように、光束制御部材４００の中心軸ＣＡの方向（表裏方向）において、支持突起４３０の最大高さは、第２光学面４２０の最大高さより高い。これにより、光拡散板１２０が撓んだ場合でも、光拡散板１２０と光束制御部材４００の第２光学面４２０とが接触することを防ぐことができる。 The support projection 430 is arranged on the front side of the luminous flux control member 400, and supports the light diffusing plate 120 in the surface light source device. That is, the support projection 430 is in contact with the light diffusing plate 120 in the surface light source device 100. As shown in FIG. 9B, the maximum height of the support projection 430 is higher than the maximum height of the second optical surface 420 in the direction (front and back directions) of the central axis CA of the luminous flux control member 400. As a result, even when the light diffusing plate 120 is bent, it is possible to prevent the light diffusing plate 120 from coming into contact with the second optical surface 420 of the luminous flux control member 400.
　支持突起４３０の位置は、支持突起４３０が光拡散板１２０を支持できれば特に制限されないが、例えば、支持突起４３０は、その全部もしくは一部が第２光学面４２０上に配置されるか、第２光学面４２０の外縁に配置されるか、または第２光学面より外側に配置される。これらの内、支持突起４３０は、光束制御部材４００の光学的機能を損なわない位置に配置するという観点から、第２光学面４２０より外側に配置されることが好ましい。一方、第２光学面４２０と光拡散板１２０との接触をより抑制するという観点からは、支持突起４３０は、その全部または一部が第２光学面４２０上に配置されることが好ましく、第２光学面４２０の最大高さ位置により近い位置に配置されることがより好ましく、第２光学面４２０の最大高さ位置に配置されることがさらにより好ましい。 The position of the support projection 430 is not particularly limited as long as the support projection 430 can support the light diffusing plate 120. For example, the support projection 430 may be entirely or partially arranged on the second optical surface 420 or may have a second support projection 430. It is arranged on the outer edge of the optical surface 420 or outside the second optical surface. Of these, the support projection 430 is preferably arranged outside the second optical surface 420 from the viewpoint of arranging the support projection 430 at a position that does not impair the optical function of the luminous flux control member 400. On the other hand, from the viewpoint of further suppressing the contact between the second optical surface 420 and the light diffusing plate 120, it is preferable that all or part of the support projection 430 is arranged on the second optical surface 420. It is more preferable that the two optical surfaces 420 are arranged closer to the maximum height position, and even more preferably the second optical surface 420 is arranged at the maximum height position.
　本実施の形態では、支持突起４３０は、中心軸ＣＡに直交する方向において、光束制御部材４００の第２光学面４２０より外側に配置されている。これにより、支持突起４３０が第２光学面４２０の光束制御機能を損なうことが抑制される。なお、支持突起４３０が第２光学面４２０より外側に配置される場合、支持突起４３０は第２光学面４２０の側方に配置された鍔部（フランジ）上に配置されることが好ましい。また、面光源装置１００を平面視したとき、複数の発光装置２００は、支持突起４３０の位置が不規則になるように配置されることが好ましい（図３Ａ参照）。これにより、支持突起４３０に起因する輝度ムラが生じることを抑制することができる。 In the present embodiment, the support projection 430 is arranged outside the second optical surface 420 of the luminous flux control member 400 in the direction orthogonal to the central axis CA. As a result, it is possible to prevent the support projection 430 from impairing the luminous flux control function of the second optical surface 420. When the support projection 430 is arranged outside the second optical surface 420, it is preferable that the support projection 430 is arranged on a flange portion arranged on the side of the second optical surface 420. Further, when the surface light source device 100 is viewed in a plan view, it is preferable that the plurality of light emitting devices 200 are arranged so that the positions of the support protrusions 430 are irregular (see FIG. 3A). As a result, it is possible to suppress the occurrence of uneven brightness caused by the support projection 430.
　また、支持突起４３０は、後述するゲート跡４４０との関係から以下のように配置されることが好ましい。すなわち、支持突起４３０はゲート跡４４０から中心軸に対してひいた垂線に対して直交する中心軸を含む仮想平面に対して、ゲート跡４４０の反対側に配置されていることが好ましい。このように配置されることで、光束制御機能を損なうことがある支持突起４３０とゲート跡４４０とを光束制御部材４００において離して配置させることができ、輝度ムラが生じることを抑制することができる。 Further, the support protrusion 430 is preferably arranged as follows in relation to the gate mark 440 described later. That is, it is preferable that the support protrusion 430 is arranged on the opposite side of the gate mark 440 with respect to the virtual plane including the central axis orthogonal to the perpendicular line drawn from the gate mark 440 with respect to the central axis. By arranging in this way, the support projection 430 and the gate mark 440, which may impair the luminous flux control function, can be arranged apart from each other in the luminous flux control member 400, and it is possible to suppress the occurrence of uneven brightness. ..
　また、支持突起４３０は、後述する脚部４５０との関係からは以下のように配置されることが好ましい。すなわち、支持突起４３０は、平面視したときに脚部４５０より中心軸ＣＡにより近い位置に配置されることが好ましい。このように配置されることで、光拡散板１２０の重さが支持突起４３０にかかって光束制御部材４００が傾くことで、脚部４５０と基板１１５との接着がはがれてしまうことを抑制することができる。 Further, the support protrusion 430 is preferably arranged as follows from the relationship with the leg portion 450 described later. That is, it is preferable that the support protrusion 430 is arranged at a position closer to the central axis CA than the leg portion 450 when viewed in a plan view. By arranging in this way, it is possible to prevent the light flux control member 400 from being peeled off due to the weight of the light diffusing plate 120 being applied to the support projection 430 and the light flux control member 400 being tilted. Can be done.
　図１０Ａ～Ｄは、支持突起４３０が、脚部４５０より中心軸ＣＡにより近い位置に配置されるときの一例を示す。図１０Ａ～Ｄは、それぞれ、光束制御部材の平面図、断面図、底面図、右側面図を示している。なお、図１０Ａ～Ｄは、支持突起４３０が中心軸ＣＡ上にある場合を示している。 FIGS. 10A to 10D show an example when the support protrusion 430 is arranged at a position closer to the central axis CA than the leg portion 450. 10A to 10D show a plan view, a cross-sectional view, a bottom view, and a right side view of the luminous flux control member, respectively. 10A to 10D show a case where the support projection 430 is on the central axis CA.
　支持突起４３０の形状は、光拡散板１２０を支持できれば特に制限されないが、光束制御部材４００の光学的機能を損なわない形状であることが好ましい。本実施の形態では、支持突起４３０の形状は、円錐台である。 The shape of the support protrusion 430 is not particularly limited as long as it can support the light diffusing plate 120, but it is preferable that the shape does not impair the optical function of the luminous flux control member 400. In this embodiment, the shape of the support protrusion 430 is a truncated cone.
　支持突起４３０の数は、特に制限されないが、光束制御部材４００の機能を損なわない観点からは少ないことが好ましい。本実施の形態では、上記の観点から、支持突起４３０の数は１つである。 The number of support protrusions 430 is not particularly limited, but is preferably small from the viewpoint of not impairing the function of the luminous flux control member 400. In the present embodiment, the number of support protrusions 430 is one from the above viewpoint.
　一方、支持突起４３０の数は、光拡散板１２０の重さが１つの支持突起４３０にかかって光束制御部材４００が傾くことで、脚部４５０と基板１１５との接着がはがれてしまうことを抑制するという観点からは、複数であることが好ましい。この場合、支持突起４３０の数は、具体的には、例えば、２つ、３つ、４つ、５つである。 On the other hand, the number of support protrusions 430 suppresses the adhesion between the leg portion 450 and the substrate 115 from being peeled off due to the weight of the light diffusing plate 120 being applied to one support protrusion 430 and the light flux control member 400 being tilted. From the viewpoint of doing so, it is preferable that there are a plurality of them. In this case, the number of support protrusions 430 is, for example, two, three, four, or five.
　図１１Ａ～Ｄは、実施の形態２に係る光束制御部材４００において、２つの支持突起４３０がある場合を示す。図１１Ａ～Ｄは、それぞれ、光束制御部材の平面図、断面図、底面図、右側面図を示す。 11A to 11D show a case where the luminous flux control member 400 according to the second embodiment has two support protrusions 430. 11A to 11D show a plan view, a cross-sectional view, a bottom view, and a right side view of the luminous flux control member, respectively.
　支持突起４３０の数が複数の場合、支持突起４３０は、光拡散板１２０の重さが各支持突起４３０に均一にかかるように、中心軸ＣＡを中心とする円周上に均等に配置されることが好ましい（図１１Ａ参照）。 When the number of the support protrusions 430 is plurality, the support protrusions 430 are evenly arranged on the circumference centered on the central axis CA so that the weight of the light diffusing plate 120 is uniformly applied to the support protrusions 430. It is preferable (see FIG. 11A).
　支持突起４３０の大きさは、光拡散板１２０が第２光学面４２０に接触しないように光拡散板１２０を支持できれば特に制限されず、面光源装置１００に求められる厚みなどに応じて適宜設定されうる。中心軸ＣＡの方向（表裏方向）において、第２光学面４２０の最大高さから支持突起４３０の最大高さまでの長さ（ｈ）は、例えば０．０１ｍｍ～１０ｍｍ程度であり、０．０５ｍｍ～２ｍｍ程度が好ましい（図９Ｂ参照）。また、光束制御部材４００が配置されている基板１１５と第２光学面４２０の頂部との間の距離を距離Ａとし、基板１１５と光拡散板１２０との間の距離を距離ＯＤとしたとき、支持突起４３０の高さは、上記のＯＤ≦２Ａを満たすように設定されることが好ましい（図５Ａ～Ｄ参照）。 The size of the support projection 430 is not particularly limited as long as the light diffusing plate 120 can be supported so that the light diffusing plate 120 does not come into contact with the second optical surface 420, and is appropriately set according to the thickness required for the surface light source device 100 and the like. sell. In the direction of the central axis CA (front and back directions), the length (h) from the maximum height of the second optical surface 420 to the maximum height of the support projection 430 is, for example, about 0.01 mm to 10 mm, and 0.05 mm to 0.05 mm. It is preferably about 2 mm (see FIG. 9B). Further, when the distance between the substrate 115 on which the luminous flux control member 400 is arranged and the top of the second optical surface 420 is defined as the distance A, and the distance between the substrate 115 and the light diffusing plate 120 is defined as the distance OD. The height of the support protrusion 430 is preferably set so as to satisfy the above OD ≦ 2A (see FIGS. 5A to 5D).
　ゲート跡４４０は、光束制御部材４００が射出成形で製造されることにより、光束制御部材４００に残るものである。本実施の形態では、ゲート跡４４０は、光束制御部材４００の外周部に形成されている。図９Ａに示されているように、光束制御部材４００を平面視したときに、ゲート跡４４０および支持突起４３０は、中心軸ＣＡを挟むように配置されていることが好ましい。このように配置されることで、光を所望の方向へ配向できないことがあるゲート跡４４０と支持突起４３０とを光束制御部材４００において離して配置することができ、輝度ムラを抑制することができる。 The gate mark 440 remains in the luminous flux control member 400 because the luminous flux control member 400 is manufactured by injection molding. In the present embodiment, the gate mark 440 is formed on the outer peripheral portion of the luminous flux control member 400. As shown in FIG. 9A, when the luminous flux control member 400 is viewed in a plan view, the gate trace 440 and the support protrusion 430 are preferably arranged so as to sandwich the central axis CA. By arranging in this way, the gate trace 440 and the support projection 430, which may not be able to orient the light in a desired direction, can be arranged apart from each other in the luminous flux control member 400, and uneven brightness can be suppressed. ..
　脚部４５０は、発光素子２１０に対して光束制御部材４００を適切な位置に位置決めするために、光束制御部材４００の裏側に設けられている。本実施の形態では図９Ｃに示されているように光束制御部材４００の裏側に３つの脚部４５０が設けられている。 The leg portion 450 is provided on the back side of the luminous flux control member 400 in order to position the luminous flux control member 400 at an appropriate position with respect to the light emitting element 210. In this embodiment, as shown in FIG. 9C, three legs 450 are provided on the back side of the luminous flux control member 400.
　また、脚部４５０の少なくとも１つは、は支持突起４３０と中心軸ＣＡとの間に配置される。すなわち、平面視したときに支持突起４３０に最も近い脚部４５０は、支持突起４３０および中心軸ＣＡを通る線上に配置される（図９Ｃ参照）。このように配置されることで、光拡散板１２０の重さが支持突起４３０にかかって光束制御部材４００が傾くことで、脚部４５０と基板１１５との接着がはがれてしまうことを抑制することができる。 Further, at least one of the legs 450 is arranged between the support protrusion 430 and the central axis CA. That is, the leg portion 450 closest to the support protrusion 430 when viewed in a plan view is arranged on a line passing through the support protrusion 430 and the central axis CA (see FIG. 9C). By arranging in this way, it is possible to prevent the light flux control member 400 from being peeled off due to the weight of the light diffusing plate 120 being applied to the support projection 430 and the light flux control member 400 being tilted. Can be done.
　（効果）
　本実施の形態に係る面光源装置は、実施の形態１に係る面光源装置１００と同様の効果を有する。 (effect)
The surface light source device according to the present embodiment has the same effect as the surface light source device 100 according to the first embodiment.
　本出願は、２０１９年９月２０日出願の特願２０１９－１７１５７４号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. 2019-171574 filed on September 20, 2019. All the contents described in the application specification and drawings are incorporated in the specification of the present application.
　本発明に係る光束制御部材、発光装置、面光源装置および表示装置は、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, light emitting device, surface light source device, and display device according to the present invention can be applied to, for example, a backlight of a liquid crystal display device, general lighting, and the like.
　１０　照明装置
　２０　光モジュール
　２１　ＬＥＤ
　２２　拡散レンズ
　３０　支持ピン
　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　内面
　１１５　基板
　１２０　光拡散板（発光面）
　２００　発光装置
　２１０　発光素子
　３００、４００　光束制御部材
　３１０、４１０　第１光学面
　３２０、４２０　第２光学面
　３３０、４３０　支持突起
　３４０、４４０　ゲート跡
　３５０、４５０　脚部
　４６０　第３光学面
　ＣＡ　中心軸 10 Lighting device 20 Optical module 21 LED
22 Diffusing lens 30 Support pin 100 Surface light source device 100'Display device 102 Display member (irradiated member)
110 Housing 112 Bottom plate 114 Inner surface 115 Substrate 120 Light diffusing plate (light emitting surface)
200 Light emitting device 210 Light emitting element 300, 400 Luminous flux control member 310, 410 First optical surface 320, 420 Second optical surface 330, 430 Support protrusion 340, 440 Gate mark 350, 450 Leg 460 Third optical surface CA Central axis

Claims (11)

  1. 　光拡散板を有する面光源装置に用いられる、発光素子から出射された光の配光を制御するための光束制御部材であって、
    　前記光束制御部材の裏側に配置されており、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第１光学面と、前記光束制御部材の表側に配置されており、前記第１光学面で入射した光を透過または反射させるための第２光学面と、
    　前記光束制御部材の表側に配置されており、前記光拡散板を支持するための支持突起と、
    　前記光束制御部材の裏側に配置された複数の脚部と、
    　を有し、
    　前記光束制御部材の中心軸の方向において、前記支持突起の最大高さは、前記第２光学面の最大高さより高く、
    　平面視したときに、前記複数の脚部のうち前記支持突起に最も近い前記脚部は、前記支持突起および前記中心軸を通る線上に配置されている、
    　光束制御部材。     A luminous flux control member for controlling the light distribution of light emitted from a light emitting element, which is used in a surface light source device having a light diffusing plate.
    It is arranged on the back side of the luminous flux control member, and is arranged on the first optical surface for incident the light emitted from the light emitting element into the inside of the luminous flux control member and on the front side of the luminous flux control member. A second optical surface for transmitting or reflecting light incident on the first optical surface, and
    A support projection, which is arranged on the front side of the luminous flux control member and supports the light diffusing plate,
    A plurality of legs arranged on the back side of the luminous flux control member, and
    Have,
    In the direction of the central axis of the luminous flux control member, the maximum height of the support projection is higher than the maximum height of the second optical surface.
    When viewed in a plan view, the leg portion closest to the support protrusion among the plurality of leg portions is arranged on a line passing through the support protrusion and the central axis.
    Luminous flux control member.
  2. 　前記支持突起は、その全部もしくは一部が前記第２光学面上に配置されているか、前記第２光学面より外側に配置されている、請求項１に記載の光束制御部材。 The luminous flux control member according to claim 1, wherein all or part of the support projection is arranged on the second optical surface or is arranged outside the second optical surface.
  3. 　前記光束制御部材の外周部の一部に配置されたゲート跡をさらに有し、
    　前記中心軸を含み、前記ゲート跡から前記中心軸に対してひいた垂線に直交する仮想平面に対して、前記支持突起は、ゲート跡の反対側に配置されている、
    　請求項１または請求項２に記載の光束制御部材。     Further having a gate mark arranged on a part of the outer peripheral portion of the luminous flux control member,
    The support projection is arranged on the opposite side of the gate trace with respect to the virtual plane including the central axis and orthogonal to the perpendicular line drawn from the gate trace with respect to the central axis.
    The luminous flux control member according to claim 1 or 2.
  4. 　前記光束制御部材を平面視したとき、前記ゲート跡および前記支持突起は、前記中心軸を挟むように配置されている、
    　請求項３に記載の光束制御部材。     When the luminous flux control member is viewed in a plan view, the gate trace and the support protrusion are arranged so as to sandwich the central axis.
    The luminous flux control member according to claim 3.
  5. 　前記第２光学面は、前記第１光学面で入射した光を前記光束制御部材の外部に出射させるための出射面である、請求項１～４のいずれか一項に記載の光束制御部材。 The luminous flux control member according to any one of claims 1 to 4, wherein the second optical surface is an emission surface for emitting light incident on the first optical surface to the outside of the luminous flux control member.
  6. 　前記第２光学面を取り囲むように配置されている第３光学面をさらに有し、
    　前記第２光学面は、前記第１光学面で前記光束制御部材の内部に入射した光を反射させるための反射面であり、
    　前記第３光学面は、前記第２光学面で反射した光を前記光束制御部材の外部に出射させるための出射面である、
    　請求項１～４のいずれか一項に記載の光束制御部材。     It further has a third optical surface that is arranged so as to surround the second optical surface.
    The second optical surface is a reflection surface for reflecting light incident on the inside of the luminous flux control member on the first optical surface.
    The third optical surface is an exit surface for emitting the light reflected by the second optical surface to the outside of the luminous flux control member.
    The luminous flux control member according to any one of claims 1 to 4.
  7. 　発光素子と、
    　前記発光素子上に配置された請求項１～６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 6 arranged on the light emitting element.
    A light emitting device.
  8. 　請求項７に記載の発光装置と、
    　前記発光装置から出射された光を拡散させつつ透過させる光拡散板と、
    　を有し、
    　前記支持突起は、前記光拡散板に接触している、面光源装置。     The light emitting device according to claim 7 and
    A light diffusing plate that diffuses and transmits the light emitted from the light emitting device,
    Have,
    A surface light source device in which the support protrusions are in contact with the light diffusing plate.
  9. 　前記面光源装置は、複数の前記発光装置を有しており、
    　前記面光源装置を平面視したとき、前記複数の発光装置は、前記支持突起の位置が不規則になるように配置されている、請求項８に記載の面光源装置。     The surface light source device has a plurality of the light emitting devices.
    The surface light source device according to claim 8, wherein the plurality of light emitting devices are arranged so that the positions of the support protrusions are irregular when the surface light source device is viewed in a plan view.
  10. 　前記光束制御部材が配置されている基板と前記第２光学面の頂部との間の距離Ａと、前記基板と前記光拡散板との間の距離ＯＤとは、ＯＤ≦２Ａを満たす、請求項８または請求項９に記載の面光源装置。 A claim that the distance A between the substrate on which the light flux control member is arranged and the top of the second optical surface and the distance OD between the substrate and the light diffusing plate satisfy OD ≦ 2A. 8 or the surface light source device according to claim 9.
  11. 　請求項８または請求項９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 8 or 9.
    A display member that is irradiated with light emitted from the surface light source device and
    Has a display device.
PCT/JP2020/035147 2019-09-20 2020-09-16 Light flux controlling member, light-emitting device, surface light source apparatus, and display apparatus WO2021054377A1 (en)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
WO2011010488A1 (en) * 2009-07-21 2011-01-27 シャープ株式会社 Lens unit, light emitting module, illumination device, display device, and television receiving device
JP2015176862A (en) * 2014-03-18 2015-10-05 株式会社エンプラス Light-emitting device, surface light source device and display device
US20150300594A1 (en) * 2011-10-11 2015-10-22 Lg Electronics Inc. Optical assembly, backlight unit having the same, and display apparatus thereof
JP2017183077A (en) * 2016-03-30 2017-10-05 株式会社エンプラス Surface light source device, display device and luminous flux control member

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011010488A1 (en) * 2009-07-21 2011-01-27 シャープ株式会社 Lens unit, light emitting module, illumination device, display device, and television receiving device
US20150300594A1 (en) * 2011-10-11 2015-10-22 Lg Electronics Inc. Optical assembly, backlight unit having the same, and display apparatus thereof
JP2015176862A (en) * 2014-03-18 2015-10-05 株式会社エンプラス Light-emitting device, surface light source device and display device
JP2017183077A (en) * 2016-03-30 2017-10-05 株式会社エンプラス Surface light source device, display device and luminous flux control member

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