WO2020196572A1 - Planar light source device, and display device - Google Patents

Planar light source device, and display device Download PDF

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Publication number
WO2020196572A1
WO2020196572A1 PCT/JP2020/013185 JP2020013185W WO2020196572A1 WO 2020196572 A1 WO2020196572 A1 WO 2020196572A1 JP 2020013185 W JP2020013185 W JP 2020013185W WO 2020196572 A1 WO2020196572 A1 WO 2020196572A1
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Prior art keywords
light
light emitting
reflecting
emitting device
reflection
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PCT/JP2020/013185
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French (fr)
Japanese (ja)
Inventor
祐介 大橋
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株式会社エンプラス
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Publication of WO2020196572A1 publication Critical patent/WO2020196572A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction

Definitions

  • the present invention relates to a surface light source device and a display device.
  • a surface light source device may be used to uniformly illuminate the display panel.
  • the light emitted from the light source is spread in the surface direction by the light guide plate and irradiated toward the display panel (see, for example, Patent Document 1).
  • the display device described in Patent Document 1 includes a backlight assembly (surface light source device) and a display panel.
  • the backlight assembly includes a first light guide plate, a second light guide plate, a light source portion, a lid portion, and a print sheet.
  • the first light guide plate and the second light guide plate are arranged on the same plane so as to be separated from each other.
  • the light source unit is arranged between the first light guide plate and the second light guide plate.
  • the lid portion is arranged so as to be directly above the light source portion and to overlap a part of the first light guide plate and the second light guide plate, respectively.
  • the light source unit has a first light source arranged to face the first light guide plate and a second light source arranged to face the second light source plate.
  • the print sheet is arranged between the light source portion and the lid portion.
  • the print sheet has a film and a print pattern.
  • the print pattern is formed at a position corresponding to the first light source or the second light source, and is formed so as to become smaller as the distance from the first light source or the second light source increases.
  • the light source portion is surrounded by the first light guide plate, the second light guide plate, and the lid portion.
  • the light emitted from the light source unit and traveling toward the first light guide plate and the second light guide plate is guided by the first light guide plate and the second light guide plate, respectively, and reaches the display panel.
  • the light emitted from the light source unit and traveling toward the lid portion passes through the print sheet and reaches the lid portion.
  • the print pattern of the print sheet suppresses the generation of bright lines and dark lines caused by the first light source and the second light source.
  • An object of the present invention is to provide a surface light source device and a display device capable of suppressing the visibility of bright areas generated in a band shape and improving the uniformity of the light emitting surface.
  • the surface light source device has a housing having an opening arranged on the bottom plate and the opposite side of the bottom plate, a row of light emitting devices arranged in the first direction on the bottom plate, and arranged on the bottom plate. It has a reflecting plate that reflects the light emitted from the light emitting device row, and a light diffusing plate that is arranged so as to cover the opening and transmits the light from the light emitting device row while diffusing it.
  • a plurality of light emitting devices including a light emitting element and a light beam control member for controlling light distribution of light emitted from the light emitting element are arranged at regular intervals in the first direction.
  • the light beam control member has an incident surface formed on the bottom plate side for incident light emitted from the light emitting element, and at least a part of the light incident on the incident surface along the reflecting plate and the first.
  • Two reflecting surfaces formed on the light diffusing plate side that reflect light in directions that are orthogonal to each other and that are substantially opposite to each other, and two that emit light reflected by the reflecting surface to the outside.
  • the reflecting plate includes a light emitting surface, is arranged in parallel with the light emitting device row along the first direction, and has a reflection adjusting unit for adjusting the amount of reflection of light emitted from the light emitting device row.
  • the reflection adjusting unit includes a first reflecting unit that reflects the light emitted from the light emitting device row toward the light diffusing plate, and a second reflecting unit having a lower reflectance than the first reflecting unit. Including, the first reflecting portion and the second reflecting portion are alternately arranged along the first direction, and the center-to-center distance between two adjacent light emitting devices in the first direction is adjacent to each other. It is different from the total repeating length of the first reflecting portion and the second reflecting portion.
  • the display device includes a surface light source device according to the present invention and a display member arranged on the light diffusing plate.
  • the present invention it is possible to provide a surface light source device and a display device capable of suppressing the visibility of bright portions generated in a band shape and improving the uniformity of the light emitting surface.
  • FIG. 1A to 1C are views showing the configuration of the surface light source device according to the first embodiment of the present invention.
  • 2A and 2B are views showing the configuration of the surface light source device according to the first embodiment of the present invention.
  • 3A to 3E are views showing the configuration of the luminous flux control member.
  • 4A and 4B are schematic views showing a specific example of the second reflecting portion.
  • 5A and 5B are diagrams showing the relationship between the pitch between the light emitting devices and the total length of the first reflecting portion and the second reflecting portion.
  • FIG. 6 is a diagram showing a configuration of a surface light source device according to a second embodiment of the present invention.
  • FIGS. 2A and 2B are diagrams showing the configuration of the surface light source device 100 according to the present embodiment.
  • 1A is a plan view of the surface light source device 100
  • FIG. 1B is a side view
  • FIG. 1C is a front view.
  • FIG. 2A is a plan view with the light diffusing plate 150 removed
  • FIG. 2B is a partially enlarged cross-sectional view taken along the line AA in FIG. 1A.
  • the light emitting device 130 is displayed in a large size.
  • the surface light source device 100 includes a housing 110, a substrate 120, a light emitting device row 130A including a plurality of light emitting devices 130, a reflector 140, and light diffusion. It has a plate 150 and. Further, as shown in FIG. 1C, the surface light source device 100 can also be used as a display device 100'by combining with a display member (irradiated member) 160 such as a liquid crystal panel.
  • a display member irradiated member
  • the housing 110 houses the substrate 120, the light emitting device row 130A, and the reflector 140 inside.
  • the housing 110 is a box that is at least partially open.
  • the housing 110 has a bottom plate 111 and an opening arranged on the opposite side of the bottom plate 111.
  • the housing 110 has a bottom surface 111a, which is the surface of the bottom plate 111, two first inclined surfaces 112, and two second inclined surfaces 113.
  • the bottom surface 111a is a horizontal plane.
  • a substrate 120 and a reflector 140 are arranged on the upper surface of the bottom plate 111.
  • the two first inclined surfaces 112 and the two second inclined surfaces 113 are arranged so as to sandwich the bottom surface 111a, and are inclined so as to approach the light diffusing plate 150 as the distance from the light emitting element 131 increases.
  • the two first inclined surfaces 112 and the two second inclined surfaces 113 reflect the light emitted from the light emitting device row 130A in the substantially horizontal direction toward the light diffusing plate 150 and are emitted from the light emitting device row 130A. Light can be easily collected on the light diffusing plate 150. That is, the first inclined surface 112 and the second inclined surface 113 can each function as reflective surfaces.
  • the first inclined surface 112 and the second inclined surface 113 may be a flat surface or a curved surface, respectively. In the present embodiment, both the first inclined surface 112 and the second inclined surface 113 are flat surfaces.
  • the inclination angle of the first inclined surface 112 with respect to the bottom surface 111a is, for example, 6 to 9 °
  • the inclination angle of the second inclined surface 113 with respect to the bottom surface 111a is, for example, 40 to 50 °.
  • the inclination angle of the first inclined surface 112 (or the second inclined surface 113) with respect to the bottom surface 111a means the smaller angle between the first inclined surface 112 (or the second inclined surface 113) and the bottom surface 111a. ..
  • the inclination angle with respect to the bottom surface 111a means the inclination angle with respect to the horizontal portion of the bottom surface 111a.
  • the size of the opening of the housing 110 corresponds to the size of the light emitting region formed on the light diffusing plate 150, and is, for example, 400 mm ⁇ 700 mm (32 inches). This opening is closed by the light diffusing plate 150.
  • the height (space thickness) from the surface of the bottom surface 111a to the light diffusing plate 150 is not particularly limited, but is about 10 to 40 mm.
  • the housing 110 is made of, for example, a resin such as polymethyl methacrylate (PMMA) or polycarbonate (PC), or a metal such as stainless steel or aluminum.
  • the substrate 120 is arranged on the bottom plate 111 (bottom side 111a) of the housing 110.
  • the substrate 120 is a flat plate for arranging the light emitting device rows 130A in the housing 110 at predetermined intervals.
  • the surface of the substrate 120 reflects the light arriving from the light emitting device row 130A toward the light diffusing plate 150. That is, the surface of the substrate 120 can also function as a reflective surface.
  • the light emitting device row 130A has a plurality of light emitting devices 130.
  • the number of light emitting device rows 130A is not particularly limited.
  • the light emitting device row 130A may be a single row or a plurality of rows. In the present embodiment, the light emitting device row 130A is one row. The case where the light emitting device rows 130A are a plurality of rows will be described later (see the second embodiment).
  • Each of the plurality of light emitting devices 130 includes a light emitting element 131 and a luminous flux control member 132 that controls the light distribution of the light emitted from the light emitting element 131.
  • the light emitting element 131 is arranged on the substrate 120.
  • the light emitting element 131 is a light source of the surface light source device 100 (and the light emitting device 130), and emits light from the upper end portions of the upper surface and the side surface.
  • the light emitting element 131 is, for example, a light emitting diode (LED).
  • the color of the light emitted from the vicinity of the light emitting center of the light emitting element 131 can be appropriately selected.
  • the color of the light emitted from the vicinity of the light emitting center of the light emitting element 131 may be white or blue. In the present embodiment, the color of the light emitted from the vicinity of the light emitting center of the light emitting element 131 is white.
  • the height of the light emitting surface of the light emitting element 131 is the same as or equal to the back surface 176 of the light flux control member 132. Is preferably higher than.
  • the luminous flux control member 132 controls the light distribution of the light emitted from the light emitting element 131.
  • the luminous flux control member 132 is arranged on the light emitting element 131 so that its central axis CA coincides with the optical axis OA of the light emitting element 131 (see FIG. 2B).
  • the “optical axis OA of the light emitting element 131” means a light beam at the center of a three-dimensional emitted light flux from the light emitting element 131.
  • the “central axis CA of the luminous flux control member 132” means, for example, a axis of symmetry that is twice symmetrical.
  • the luminous flux control member 132 emits the light emitted from the light emitting element 131 from the two emission surfaces 173 described later toward the two first inclined surfaces 112 (the two emission surfaces 173 described later have: (As opposed to each of the two first inclined surfaces 112).
  • the light emitting center of the light emitting element 131 is set as the origin
  • the axis parallel to the optical axis OA of the light emitting element 131 is set as the Z axis
  • the direction orthogonal to the Z axis is arranged (light emitting).
  • the axis parallel to the device row 130A) is defined as the Y axis
  • the Z axis and the axis orthogonal to the Y axis are defined as the X axis.
  • the arrangement direction of the light emitting device row 130A (the arrangement direction of the plurality of light emitting devices 130) is set as the first direction (Y direction), and the direction orthogonal to the first direction along the surface of the substrate 120 is the second direction (X direction). ).
  • the material of the luminous flux control member 132 is not particularly limited as long as it can pass light of a desired wavelength.
  • the material of the light beam control member 132 is a light-transmitting resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), epoxy resin (EP), or glass.
  • 3A to 3E are views showing the configuration of the luminous flux control member 132.
  • 3A is a plan view of the luminous flux control member 132
  • FIG. 3B is a front view
  • FIG. 3C is a bottom view
  • FIG. 3D is a side view
  • FIG. 3E is shown in FIG. 3A. It is sectional drawing of line AA.
  • the substrate 120 side (light emitting element 131 side) is referred to as the “back side”
  • the light diffusing plate 150 side is referred to as the “front side”.
  • the luminous flux control member 132 controls the light distribution of the light emitted from the light emitting element 131. As shown in FIGS. 3A to 3E, the luminous flux control member 132 has an incident surface 171, two reflecting surfaces 172, two emitting surfaces 173, two flange portions 174, and four leg portions 175. ..
  • the incident surface 171 is incident with the light emitted from the light emitting element 131.
  • the incident surface 171 is arranged on the back side (reflector 140 side, back surface 176) of the luminous flux control member 132 so as to intersect the optical axis OA.
  • the shape of the incident surface 171 is not particularly limited as long as it can exhibit the above functions.
  • the shape of the incident surface 171 may be a flat surface or an inner surface of a recess 177 opened in the back surface 176. In the present embodiment, the incident surface 171 is the inner surface of the recess 177 opened in the back surface 176.
  • the shape of the recess 177 is also not particularly limited.
  • the recess 177 has an inner top surface 177a (first incident surface) and an inner surface 177b (second incident surface) that faces the inner surface 177a in the X-axis direction with the inner surface 177a (first incident surface).
  • the number of the inner surface surface 177a (first incident surface) and the inner surface surface 177b (second incident surface) is not particularly limited, and may be one or two or more, respectively. In the present embodiment, the number of the inner top surface 177a and the inner surface surface 177b is two, respectively.
  • the inner top surface 177a (first incident surface) and the inner surface 177b (second incident surface) may be flat or curved, respectively.
  • the inner top surface 177a is a curved surface that is convex to the back side in a cross section (virtual cross section) including the optical axis OA and the X axis from the viewpoint of facilitating the incident light reaching the reflecting surface 172.
  • the inner side surface 177b is a flat surface.
  • the inner surface (incident surface 171) of the recess 177 may further have another surface.
  • the two reflecting surfaces 172 are arranged at positions (front side) facing the light emitting element 131 with the incident surface 171 in between. Further, the two reflecting surfaces 172 have at least a part of the light incident on the inner surface surface 177a in two directions (both of which are substantially perpendicular to the optical axis OA of the light emitting element 131 and substantially opposite to each other). Reflect in the direction along the X axis). In the above virtual cross section, the two reflecting surfaces 172 are formed so as to be separated from the X-axis as they are separated from the optical axis OA.
  • the inclination of the tangent line gradually decreases (along the X axis) from the optical axis OA of the light emitting element 131 toward the end (exit surface 173). Like) each is formed.
  • the two exit surfaces 173 are arranged so as to face each other (in the X-axis direction) with the two reflection surfaces 172 in between.
  • the two exit surfaces 173 allow light incident on the inner top surface 177a and reflected by the reflection surface 172 and light incident on the inner surface 177b and directly arriving to the outside (first inclined surface of the housing 110). (Toward 112).
  • the exit surface 173 may be a flat surface or a curved surface.
  • the exit surface 173 is a surface substantially parallel to the optical axis OA in the virtual cross section. “Approximately parallel to the optical axis OA” means that the smaller angle between the optical axis OA and the exit surface 173 is 3 ° or less in the virtual cross section.
  • the smaller angle between the optical axis OA and the exit surface 173 is the curve of the optical axis OA and the virtual cross section of the exit surface 173 in the virtual cross section. It means the smaller angle of the angle formed by the tangent line.
  • the two flange portions 174 are arranged so as to project in the Y-axis direction with respect to the optical axis OA between the two reflecting surfaces 172 near the optical axis OA.
  • the flange portion 174 facilitates the handling and alignment of the luminous flux control member 132.
  • the shape of the collar portion 174 may be a shape that can control and emit the light incident on the collar portion 174.
  • the four legs 175 are substantially columnar members protruding from the back surface 176.
  • the leg portion 175 supports the luminous flux control member 132 at an appropriate position with respect to the light emitting element 131 (see FIG. 2B).
  • the leg portion 175 may be fitted into a hole portion formed in the substrate 120 and used for positioning. Further, the legs 175 need only be able to stably fix the luminous flux control member 132 to the substrate 120 in consideration of not having an adverse effect optically, and the position, shape and number of the legs 175 are particularly limited. Not done.
  • a total of four legs 175 are arranged around the incident surface 171 on the back surface 176.
  • the reflector 140 has a reflection adjusting unit 141 that adjusts the amount of reflection of the light emitted from the light emitting device row 130A.
  • the number of reflection adjusting units 141 is not particularly limited. In the present embodiment, there is one reflection adjusting unit 141 on both sides of the light emitting device row 130A on the bottom plate 111 so as to sandwich the light emitting device row 130A in the second direction (direction along the X axis). They are arranged one by one.
  • the two reflection adjusting units 141 are arranged on the bottom surface 111a in a part of the bottom surface 111a where the light emitted from the luminous flux control member 132 reaches (see FIGS. 4A and 4B).
  • the two reflection adjusting units 141 are arranged on the bottom surface 111a on both sides of the luminous flux control member 132 in the direction in which the two exit surfaces 173 of the luminous flux control member 132 face each other (X-axis direction). Has been done.
  • the reflection adjusting unit 141 emits light emitted from the upper end portion of the side surface of the light emitting element 131, and is emitted from the vicinity of the upper end portion of the emitting surface 173 of the luminous flux control member 132, and reaches the bottom surface 111a with a strong yellowish light. (Light on the long wavelength side) arrives.
  • the reflection adjusting unit 141 is not arranged on the bottom surface 111a in one or both of the directions (Y-axis direction) orthogonal to the direction in which the two emission surfaces 173 face each other with respect to the luminous flux control member 132. 2 A and B). This is because the light emitted from the luminous flux control member 132 in the Y-axis direction is less likely to be reflected on the bottom surface 111a than the light emitted from the emission surface 173, and contributes less to the brightness.
  • the reflection adjusting unit 141 has a first reflection unit 141A and a second reflection unit 141B.
  • the first reflecting portion 141A and the second reflecting portion 141B are alternately arranged along the first direction.
  • the first reflecting unit 141A reflects the light emitted from the light emitting device row 130A toward the light diffusing plate 150.
  • the first reflecting portion 141A is a part of the surface of the reflecting plate 140.
  • the first reflecting portion 141A and the second reflecting portion 141B are alternately arranged along the first direction.
  • the first reflection unit 141A or the second reflection unit 141B are arranged at positions facing each other with the light emitting device 130 sandwiched between them.
  • the light emitting device 130 may be arranged so as to be sandwiched between the first reflecting portion 141A and the second reflecting portion 141B.
  • the second reflecting portion 141B may be arranged so as to meander at a predetermined cycle in the first direction. In this case, in the first direction, the region without the second reflecting portion 141B becomes the first reflecting portion 141A.
  • the reflectance of light having a wavelength of 550 nm in the first reflecting unit 141A is R1 550
  • the reflectance of light having a wavelength of 630 nm is R1 630
  • the reflectance of light having a wavelength of 450 nm in the second reflecting unit 141B is R2 450 , light having a wavelength of 550 nm.
  • the first reflecting portion 141A and the second reflecting portion 141B preferably satisfy the following formulas (1) to (3).
  • the reflectances R1 550 and R1 630 on the long wavelength side (yellow region) of the first reflecting portion 141A are the reflectance R2 on the long wavelength side (yellow region) of the second reflecting portion 141B. 550 , higher than R2 630 . That is, in the first reflecting unit 141A, the reflectance of the light emitted from the emitting surface 173 of the luminous flux control member 132 is maintained, so that the decrease in brightness can be suppressed.
  • the second reflecting unit 141B has a lower reflectance than the first reflecting unit 141A. That is, the second reflecting unit 141B reduces the light from the light emitting device row 130A and reflects it toward the light diffusing plate 150.
  • the reflection reduction layer 142 is arranged in an island shape. The reflectance of the second reflecting portion 141B can be adjusted by adjusting the ratio of the reflection reducing layer 142 to the entire second reflecting portion 141B.
  • the plan view shape of the reflection reduction layer 142 is circular. Further, the reflection reduction layer 142 is formed so that its surface area becomes smaller as the distance from the light emitting device row 130A increases.
  • the color of the reflection reduction layer 142 is not particularly limited. The color of the reflection reduction layer 142 is appropriately selected according to the color of the reflection adjustment unit 141.
  • the reflectance on the long wavelength side (for example, the yellow region) is made lower than the reflectance on the short wavelength side (for example, the blue region).
  • the light emitted from the side surface of the light emitting element 131 which is emitted from the vicinity of the upper end portion of the emission surface 173 of the luminous flux control member 132, and reaches the bottom surface 111a, is the light having a strong yellowish color.
  • a large amount can be absorbed by the two reflecting portions 141B.
  • the yellowness of the light emitted from the vicinity of the upper end portion of the emission surface 173 of the luminous flux control member 132 and reflected on the bottom surface 111a can be reduced. Further, by setting these reflectances to 60% or more, it is possible to suppress a decrease in brightness.
  • the reflectances R2 450 , R2 550 and R2 630 of the second reflecting portion 141B are preferably not too low, and more preferably 80% or more, from the viewpoint of making it easier to suppress the decrease in brightness.
  • 5A and 5B are diagrams showing the relationship between the center-to-center distance between adjacent light emitting elements 131 and the total repeating length of the adjacent first reflecting portion 141A and second reflecting portion 141B.
  • the center-to-center distance between two adjacent light emitting devices 130 is different from the total repeating length of the adjacent first reflecting unit 141A and second reflecting unit 141B.
  • the center-to-center distance P1 of the two adjacent light emitting devices 130 is the total repeating length of the adjacent first reflecting portion 141A and the second reflecting portion 141B. It may be shorter than P2. Also, as shown in FIG. 5B, P1 may be longer than P2. Further, although not particularly shown, it is preferable that P1 is not a multiple of P2 and P2 is not a multiple of P1. As described above, since the light emitting device 130 and the first reflecting portion 141A or the second reflecting portion 141B are not arranged so as to correspond to each other, the visibility of the bright portion generated in a band shape can be suppressed.
  • the light diffusing plate 150 is arranged so as to cover the opening of the housing 110.
  • the light diffusing plate 150 is a plate-shaped member having light transmissivity and light diffusing property, and transmits the emitted light from the emitting surface 173 of the luminous flux control member 132 while diffusing it.
  • the light diffusing plate 150 can be, for example, a light emitting surface of the surface light source device 100.
  • the material of the light diffusing plate 150 can be appropriately selected as long as it can transmit the light emitted from the emitting surface 173 of the light flux control member 132 while diffusing it.
  • Examples of the material of the light diffusing plate 150 include a light transmissive 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 150 has fine irregularities formed on its surface, or light diffusing elements such as beads are dispersed inside the light diffusing plate 150.
  • the light emitted from each light emitting element 131 is light (light emission) particularly directed to the first inclined surface 112 so as to illuminate a wide range of the light diffusing plate 150 by the luminous flux control member 132.
  • Light is emitted in two directions (the X-axis direction in FIG. 3A) that are substantially perpendicular to the optical axis OA of the element 131 and that are substantially opposite to each other.
  • a part of the light emitted from the light emitting device 130 is reflected by the first inclined surface 112 and reaches the light diffusing plate 150.
  • the other part of the light emitted from the light emitting device 130 is reflected on the bottom surface 111a and reaches the light diffusing plate 150.
  • These lights that have reached the light diffusing plate 150 are further diffused by the light diffusing plate 150 and emitted to the outside. As a result, the light can be distributed over the entire surface of the surface light source device 100.
  • the arrangement of the light emitting device 130 and the arrangement of the second reflecting unit 141B do not match, and the light is reflected in the arrangement direction of the light emitting device 130. Since the rate is not constant, uneven brightness on the light diffusing plate 150 can be suppressed.
  • the surface light source device 200 according to the second embodiment differs from the surface light source device 100 according to the first embodiment only in the number of the light emitting device row 130A and the reflection adjusting unit 141. Therefore, the same configuration as the surface light source device 100 according to the first embodiment is designated by the same reference numerals and the description thereof will be omitted.
  • FIG. 6 is a plan view of the surface light source device 200 from which the light diffusing plate 150 is removed according to the second embodiment.
  • the surface light source device 200 according to the present embodiment includes a housing 110, a substrate 120, a light emitting device row 130A, a reflector 140, and a light diffusing plate 150 (not shown). Have.
  • a plurality of light emitting device rows 130A are arranged along the surface of the substrate 120 in the second direction (X-axis direction) orthogonal to the first direction (Y-axis direction).
  • the number of light emitting device rows 130A is two rows.
  • each of the light emitting devices 130 included in one light emitting device row 130A is any light emitting device included in the other light emitting device row 130A. It does not match 130.
  • the distance between one light emitting device row 130A and another adjacent light emitting device row 130A is not particularly limited. The distance between one light emitting device row 130A and another adjacent light emitting device row 130A is appropriately set according to the size of the light emitting region of the surface light source device 200.
  • the reflector 140 has a plurality of reflection adjusting units 141.
  • two reflection adjustment units 141 are arranged on the bottom surface 111a on both sides of the light flux control member 132 in the direction in which the two emission surfaces of the light flux control member 132 face each other (X-axis direction). Has been done.
  • a plurality of first reflection units 141A and a plurality of second reflection units 141B are alternately arranged in a row in the first direction (see the region wavy by the broken line in FIG. 6). ).
  • a plurality of reflection adjusting units 141 are arranged in the second direction (X-axis direction). When the plurality of reflection adjusting units 141 are viewed along the second direction, each of the plurality of first reflection units 141A and the plurality of second reflection units 141B in one reflection adjustment unit 141 is in the other reflection adjustment unit 141. It does not match each of the plurality of first reflecting portions 141A and the plurality of second reflecting portions 141B.
  • the first reflection unit 141A and the second reflection unit 141B in the one reflection adjustment unit 141 are alternately arranged along the first direction, and the two adjacent light emitting devices 130 in the first direction.
  • the distance between the centers is different from the total repeating length of the adjacent first reflecting portion 141A and second reflecting portion 141B.
  • the distance between the centers of the two adjacent light emitting devices 130 may be shorter or longer than the total repeating length of the adjacent first reflecting unit 141A and the second reflecting unit 141B.
  • the surface light source device 200 according to the present embodiment has the same effect as the surface light source device 100 according to the present embodiment.
  • the surface light source device having the luminous flux control member according to the present invention can be applied to, for example, a backlight of a liquid crystal display device, a signboard, general lighting, and the like.

Abstract

The objective of the present invention is to provide a planar light source device with which it is possible to suppress visibility of a bright portion generated in the shape of a strip, and to improve uniformity of a light emitting surface. This planar light source device includes a casing, a light emitting device row including a plurality of light emitting devices arranged in a first direction, a reflective panel including a reflection adjusting portion, and a light diffusing panel. The reflection adjusting portion includes first reflecting portions and second reflecting portions arranged alternately in the first direction. In the first direction, a center-to-center distance between two adjacent light emitting devices is different from a total repetition length of the first reflecting portions and second reflecting portions that are adjacent to one another.

Description

面光源装置および表示装置Surface light source device and display device
　本発明は、面光源装置および表示装置に関する。 The present invention relates to a surface light source device and a display device.
　液晶表示装置などの透過型画像表示装置では、表示パネルを均一に照らすために面光源装置を使用することがある。このような面光源装置は、光源から出射された光を導光板で面方向に拡げて、表示パネルに向かって照射する（例えば、特許文献１参照）。 In a transmissive image display device such as a liquid crystal display device, a surface light source device may be used to uniformly illuminate the display panel. In such a surface light source device, the light emitted from the light source is spread in the surface direction by the light guide plate and irradiated toward the display panel (see, for example, Patent Document 1).
　特許文献１に記載の表示装置は、バックライトアッセンブリ（面光源装置）と、表示パネルとを有する。バックライトアッセンブリは、第１導光板と、第２導光板と、光源部と、蓋部と、プリントシートとを有する。第１導光板および第２導光板は、同一平面上に離間して配置されている。光源部は、第１導光板と、第２導光板との間に配置されている。蓋部は、光源部の直上であって、かつ第１導光板および第２導光板の一部にそれぞれ重なるように配置されている。光源部は、第１導光板と対向して配置された第１光源と、第２導光板と対向して配置された第２光源とを有している。プリントシートは、光源部と蓋部との間に配置されている。プリントシートは、フィルムおよびプリントパターンを有する。プリントパターンは、第１光源または第２光源と対応する位置に形成されており、第１光源または第２光源から遠ざかるほど、小さくなるように形成されている。 The display device described in Patent Document 1 includes a backlight assembly (surface light source device) and a display panel. The backlight assembly includes a first light guide plate, a second light guide plate, a light source portion, a lid portion, and a print sheet. The first light guide plate and the second light guide plate are arranged on the same plane so as to be separated from each other. The light source unit is arranged between the first light guide plate and the second light guide plate. The lid portion is arranged so as to be directly above the light source portion and to overlap a part of the first light guide plate and the second light guide plate, respectively. The light source unit has a first light source arranged to face the first light guide plate and a second light source arranged to face the second light source plate. The print sheet is arranged between the light source portion and the lid portion. The print sheet has a film and a print pattern. The print pattern is formed at a position corresponding to the first light source or the second light source, and is formed so as to become smaller as the distance from the first light source or the second light source increases.
　特許文献１に記載の表示装置では、光源部が第１導光板と、第２導光板と、蓋部とにより囲まれている。光源部から出射され、第１導光板および第２導光板に向かって進行した光は、第１導光板および第２導光板でそれぞれ導光されて、表示パネルに到達する。光源部から出射され、蓋部に向かって進行した光は、プリントシートを透過して蓋部に到達する。特許文献１に記載の表示装置では、プリントシートのプリントパターンにより、第１光源および第２光源に起因する輝線や暗線などが発生することを抑制している。 In the display device described in Patent Document 1, the light source portion is surrounded by the first light guide plate, the second light guide plate, and the lid portion. The light emitted from the light source unit and traveling toward the first light guide plate and the second light guide plate is guided by the first light guide plate and the second light guide plate, respectively, and reaches the display panel. The light emitted from the light source unit and traveling toward the lid portion passes through the print sheet and reaches the lid portion. In the display device described in Patent Document 1, the print pattern of the print sheet suppresses the generation of bright lines and dark lines caused by the first light source and the second light source.
特開２０１３－０４１８１７号公報Japanese Unexamined Patent Publication No. 2013-014817
　しかしながら、特許文献１に記載された表示装置では、プリントパターンが形成された領域の輝度と、プリントパターンが形成されていない領域の輝度とが同じになるように調整されるが、輝度ムラが帯状に残ってしまうという問題があった。 However, in the display device described in Patent Document 1, the brightness of the area where the print pattern is formed and the brightness of the area where the print pattern is not formed are adjusted to be the same, but the brightness unevenness is band-shaped. There was a problem that it remained in.
　本発明の目的は、帯状に発生する明部の視認性を抑制し、発光面の均一性を向上させることができる面光源装置および表示装置を提供することである。 An object of the present invention is to provide a surface light source device and a display device capable of suppressing the visibility of bright areas generated in a band shape and improving the uniformity of the light emitting surface.
　本発明に係る面光源装置は、底板および前記底板の反対側に配置された開口部を有する筐体と、前記底板上において、第１方向に配列された発光装置列と、前記底板上に配置され、前記発光装置列から出射された光を反射させる反射板と、前記開口部を覆うように配置され、前記発光装置列からの光を拡散させつつ透過させる光拡散板と、を有し、前記発光装置列は、発光素子および前記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をそれぞれ含む複数の発光装置が、前記第１方向に一定の間隔で配置されており、前記光束制御部材は、前記発光素子から出射された光を入射させる前記底板側に形成された入射面と、前記入射面で入射した光の少なくとも一部を、前記反射板に沿い、かつ前記第１方向に直交する第２方向に沿い、かつ互いに略反対向きである方向に反射させる前記光拡散板側に形成された２つの反射面と、前記反射面で反射した光を外部に出射させる２つの出射面とを含み、前記反射板は、前記第１方向に沿って、前記発光装置列と平行に配置され、前記発光装置列から出射された光の反射量を調整する反射調整部を有し、前記反射調整部は、前記発光装置列から出射された光を前記光拡散板に向けて反射させる第１反射部と、前記第１反射部よりも反射率の低い第２反射部と、を含み、前記第１反射部および前記第２反射部は、前記第１方向に沿って交互に配置されており、前記第１方向において、隣接する２つの前記発光装置間の中心間距離は、隣接する前記第１反射部および前記第２反射部の合計の繰り返し長さと異なる。 The surface light source device according to the present invention has a housing having an opening arranged on the bottom plate and the opposite side of the bottom plate, a row of light emitting devices arranged in the first direction on the bottom plate, and arranged on the bottom plate. It has a reflecting plate that reflects the light emitted from the light emitting device row, and a light diffusing plate that is arranged so as to cover the opening and transmits the light from the light emitting device row while diffusing it. In the light emitting device row, a plurality of light emitting devices including a light emitting element and a light beam control member for controlling light distribution of light emitted from the light emitting element are arranged at regular intervals in the first direction. The light beam control member has an incident surface formed on the bottom plate side for incident light emitted from the light emitting element, and at least a part of the light incident on the incident surface along the reflecting plate and the first. Two reflecting surfaces formed on the light diffusing plate side that reflect light in directions that are orthogonal to each other and that are substantially opposite to each other, and two that emit light reflected by the reflecting surface to the outside. The reflecting plate includes a light emitting surface, is arranged in parallel with the light emitting device row along the first direction, and has a reflection adjusting unit for adjusting the amount of reflection of light emitted from the light emitting device row. The reflection adjusting unit includes a first reflecting unit that reflects the light emitted from the light emitting device row toward the light diffusing plate, and a second reflecting unit having a lower reflectance than the first reflecting unit. Including, the first reflecting portion and the second reflecting portion are alternately arranged along the first direction, and the center-to-center distance between two adjacent light emitting devices in the first direction is adjacent to each other. It is different from the total repeating length of the first reflecting portion and the second reflecting portion.
　本発明に係る表示装置は、本発明に係る面光源装置と、前記光拡散板の上に配置された表示部材と、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 arranged on the light diffusing plate.
　本発明によれば、帯状に発生する明部の視認性を抑制し、発光面の均一性を向上させることができる面光源装置および表示装置を提供できる。 According to the present invention, it is possible to provide a surface light source device and a display device capable of suppressing the visibility of bright portions generated in a band shape and improving the uniformity of the light emitting surface.
図１Ａ～Ｃは、本発明の実施の形態１に係る面光源装置の構成を示す図である。1A to 1C are views showing the configuration of the surface light source device according to the first embodiment of the present invention. 図２Ａ、Ｂは、本発明の実施の形態１に係る面光源装置の構成を示す図である。2A and 2B are views showing the configuration of the surface light source device according to the first embodiment of the present invention. 図３Ａ～Ｅは、光束制御部材の構成を示す図である。3A to 3E are views showing the configuration of the luminous flux control member. 図４Ａ、Ｂは、第２反射部の具体例を示す模式図である。4A and 4B are schematic views showing a specific example of the second reflecting portion. 図５Ａ、Ｂは、発光装置間のピッチと、第１反射部および第２反射部の合計の長さとの関係を示す図である。5A and 5B are diagrams showing the relationship between the pitch between the light emitting devices and the total length of the first reflecting portion and the second reflecting portion. 図６は、本発明の実施の形態２に係る面光源装置の構成を示す図である。FIG. 6 is a diagram showing a configuration of a surface light source device according to a second embodiment of the present invention.
　以下、本発明に係る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 according to the present invention will be described in detail with reference to the drawings.
　［実施の形態１］
　（面光源装置の構成）
　図１Ａ～Ｃおよび図２Ａ、Ｂは、本実施の形態に係る面光源装置１００の構成を示す図である。図１Ａは、面光源装置１００の平面図であり、図１Ｂは、側面図であり、図１Ｃは、正面図である。図２Ａは、光拡散板１５０を外した平面図であり、図２Ｂは、図１ＡにおけるＡ－Ａ線の部分拡大断面図である。なお、図２Ｂでは、発光装置１３０を大きく表示している。 [Embodiment 1]
(Configuration of surface light source device)
1A to 1C and FIGS. 2A and 2B are diagrams showing the configuration of the surface light source device 100 according to the present embodiment. 1A is a plan view of the surface light source device 100, FIG. 1B is a side view, and FIG. 1C is a front view. FIG. 2A is a plan view with the light diffusing plate 150 removed, and FIG. 2B is a partially enlarged cross-sectional view taken along the line AA in FIG. 1A. In FIG. 2B, the light emitting device 130 is displayed in a large size.
　図１Ａ～Ｃおよび図２Ａ、Ｂに示されるように、面光源装置１００は、筐体１１０と、基板１２０と、複数の発光装置１３０を含む発光装置列１３０Ａと、反射板１４０と、光拡散板１５０とを有する。また、図１Ｃ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）１６０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. 1A to 1C and FIGS. 2A and 2B, the surface light source device 100 includes a housing 110, a substrate 120, a light emitting device row 130A including a plurality of light emitting devices 130, a reflector 140, and light diffusion. It has a plate 150 and. Further, as shown in FIG. 1C, the surface light source device 100 can also be used as a display device 100'by combining with a display member (irradiated member) 160 such as a liquid crystal panel.
　筐体１１０は、基板１２０、発光装置列１３０Ａおよび反射板１４０をその内部に収容する。筐体１１０は、少なくとも一部が開口した箱である。筐体１１０は、底板１１１と、底板１１１の反対側に配置された開口部を有する。具体的には、筐体１１０は、底板１１１の表面である底面１１１ａと、２つの第１傾斜面１１２と、２つの第２傾斜面１１３とを有する。 The housing 110 houses the substrate 120, the light emitting device row 130A, and the reflector 140 inside. The housing 110 is a box that is at least partially open. The housing 110 has a bottom plate 111 and an opening arranged on the opposite side of the bottom plate 111. Specifically, the housing 110 has a bottom surface 111a, which is the surface of the bottom plate 111, two first inclined surfaces 112, and two second inclined surfaces 113.
　底面１１１ａは、水平面である。底板１１１の上面には、基板１２０および反射板１４０が配置されている。 The bottom surface 111a is a horizontal plane. A substrate 120 and a reflector 140 are arranged on the upper surface of the bottom plate 111.
　２つの第１傾斜面１１２および２つの第２傾斜面１１３は、それぞれ底面１１１ａを挟むように配置され、かつ発光素子１３１から離れるにつれて光拡散板１５０に近づくように傾斜した面である。２つの第１傾斜面１１２および２つの第２傾斜面１１３は、発光装置列１３０Ａから略水平方向に出射される光を光拡散板１５０に向けて反射させて、発光装置列１３０Ａから出射される光を光拡散板１５０に集めやすくできる。すなわち、第１傾斜面１１２および第２傾斜面１１３は、それぞれ反射面として機能しうる。第１傾斜面１１２および第２傾斜面１１３は、それぞれ平面であってもよいし、曲面であってもよい。本実施の形態では、第１傾斜面１１２および第２傾斜面１１３は、いずれも平面である。 The two first inclined surfaces 112 and the two second inclined surfaces 113 are arranged so as to sandwich the bottom surface 111a, and are inclined so as to approach the light diffusing plate 150 as the distance from the light emitting element 131 increases. The two first inclined surfaces 112 and the two second inclined surfaces 113 reflect the light emitted from the light emitting device row 130A in the substantially horizontal direction toward the light diffusing plate 150 and are emitted from the light emitting device row 130A. Light can be easily collected on the light diffusing plate 150. That is, the first inclined surface 112 and the second inclined surface 113 can each function as reflective surfaces. The first inclined surface 112 and the second inclined surface 113 may be a flat surface or a curved surface, respectively. In the present embodiment, both the first inclined surface 112 and the second inclined surface 113 are flat surfaces.
　第１傾斜面１１２の底面１１１ａに対する傾斜角は、例えば６～９°であり、第２傾斜面１１３の底面１１１ａに対する傾斜角は、例えば４０～５０°である。なお、第１傾斜面１１２（または第２傾斜面１１３）の底面１１１ａに対する傾斜角とは、第１傾斜面１１２（または第２傾斜面１１３）と底面１１１ａとのなす角度のうち小さい角度をいう。また、底面１１１ａの一部が傾斜している場合、底面１１１ａに対する傾斜角は、底面１１１ａの水平部に対する傾斜角を意味する。筐体１１０をこのような形状とすることで、面光源装置１００の見かけの厚みを薄くできる。 The inclination angle of the first inclined surface 112 with respect to the bottom surface 111a is, for example, 6 to 9 °, and the inclination angle of the second inclined surface 113 with respect to the bottom surface 111a is, for example, 40 to 50 °. The inclination angle of the first inclined surface 112 (or the second inclined surface 113) with respect to the bottom surface 111a means the smaller angle between the first inclined surface 112 (or the second inclined surface 113) and the bottom surface 111a. .. When a part of the bottom surface 111a is inclined, the inclination angle with respect to the bottom surface 111a means the inclination angle with respect to the horizontal portion of the bottom surface 111a. By forming the housing 110 in such a shape, the apparent thickness of the surface light source device 100 can be reduced.
　筐体１１０の底面１１１ａと対向する側（本実施の形態では、底面１１１ａ、２つの第１傾斜面１１２および２つの第２傾斜面１１３と対向する側）には、開口部が設けられている。筐体１１０の開口部の大きさは、光拡散板１５０に形成される発光領域の大きさに相当し、例えば４００ｍｍ×７００ｍｍ（３２インチ）である。この開口部は、光拡散板１５０により塞がれる。底面１１１ａの表面から光拡散板１５０までの高さ（空間厚さ）は、特に限定されないが、１０～４０ｍｍ程度である。そして、筐体１１０は、例えば、ポリメタクリル酸メチル（ＰＭＭＡ）やポリカーボネート（ＰＣ）などの樹脂や、ステンレス鋼やアルミニウムなどの金属などから構成される。 An opening is provided on the side of the housing 110 facing the bottom surface 111a (in the present embodiment, the side facing the bottom surface 111a, the two first inclined surfaces 112, and the two second inclined surfaces 113). .. The size of the opening of the housing 110 corresponds to the size of the light emitting region formed on the light diffusing plate 150, and is, for example, 400 mm × 700 mm (32 inches). This opening is closed by the light diffusing plate 150. The height (space thickness) from the surface of the bottom surface 111a to the light diffusing plate 150 is not particularly limited, but is about 10 to 40 mm. The housing 110 is made of, for example, a resin such as polymethyl methacrylate (PMMA) or polycarbonate (PC), or a metal such as stainless steel or aluminum.
　基板１２０は、筐体１１０の底板１１１（底面１１１ａ）上に配置されている。基板１２０は、発光装置列１３０Ａを筐体１１０内に所定の間隔で配置するための平板である。基板１２０の表面は、発光装置列１３０Ａから到達した光を光拡散板１５０に向けて反射させる。すなわち、基板１２０の表面は、反射面としても機能しうる。 The substrate 120 is arranged on the bottom plate 111 (bottom side 111a) of the housing 110. The substrate 120 is a flat plate for arranging the light emitting device rows 130A in the housing 110 at predetermined intervals. The surface of the substrate 120 reflects the light arriving from the light emitting device row 130A toward the light diffusing plate 150. That is, the surface of the substrate 120 can also function as a reflective surface.
　発光装置列１３０Ａは、複数の発光装置１３０を有する。発光装置列１３０Ａの数は、特に限定されない。発光装置列１３０Ａは、１列でもよいし、複数列でもよい。本実施の形態では、発光装置列１３０Ａは、１列である。発光装置列１３０Ａが複数列の場合については、後述する（実施の形態２参照）。 The light emitting device row 130A has a plurality of light emitting devices 130. The number of light emitting device rows 130A is not particularly limited. The light emitting device row 130A may be a single row or a plurality of rows. In the present embodiment, the light emitting device row 130A is one row. The case where the light emitting device rows 130A are a plurality of rows will be described later (see the second embodiment).
　複数の発光装置１３０は、発光素子１３１および発光素子１３１から出射された光の配光を制御する光束制御部材１３２をそれぞれ含む。 Each of the plurality of light emitting devices 130 includes a light emitting element 131 and a luminous flux control member 132 that controls the light distribution of the light emitted from the light emitting element 131.
　発光素子１３１は、基板１２０上に配置されている。発光素子１３１は、面光源装置１００（および発光装置１３０）の光源であり、上面および側面の上端部から光を出射する。発光素子１３１は、例えば発光ダイオード（ＬＥＤ）である。発光素子１３１の発光中心付近から出射される光の色は、適宜選択できる。発光素子１３１の発光中心付近から出射される光の色は、白色であってもよいし、青色であってもよい。本実施の形態では、発光素子１３１の発光中心付近から出射される光の色は、白色である。また、発光素子１３１から出射された光を、光束制御部材１３２の入射面１７１に効率よく入射させる観点から、発光素子１３１の発光面の高さは、光束制御部材１３２の裏面１７６と同じかそれよりも高いことが好ましい。 The light emitting element 131 is arranged on the substrate 120. The light emitting element 131 is a light source of the surface light source device 100 (and the light emitting device 130), and emits light from the upper end portions of the upper surface and the side surface. The light emitting element 131 is, for example, a light emitting diode (LED). The color of the light emitted from the vicinity of the light emitting center of the light emitting element 131 can be appropriately selected. The color of the light emitted from the vicinity of the light emitting center of the light emitting element 131 may be white or blue. In the present embodiment, the color of the light emitted from the vicinity of the light emitting center of the light emitting element 131 is white. Further, from the viewpoint that the light emitted from the light emitting element 131 is efficiently incident on the incident surface 171 of the light flux control member 132, the height of the light emitting surface of the light emitting element 131 is the same as or equal to the back surface 176 of the light flux control member 132. Is preferably higher than.
　光束制御部材１３２は、発光素子１３１から出射された光の配光を制御する。光束制御部材１３２は、その中心軸ＣＡが発光素子１３１の光軸ＯＡに一致するように、発光素子１３１の上に配置されている（図２Ｂ参照）。「発光素子１３１の光軸ＯＡ」とは、発光素子１３１からの立体的な出射光束の中心の光線を意味する。「光束制御部材１３２の中心軸ＣＡ」とは、例えば２回対称の対称軸を意味する。また、光束制御部材１３２は、発光素子１３１から出射される光を、後述する２つの出射面１７３から２つの第１傾斜面１１２に向かって出射するように（後述する２つの出射面１７３が、２つの第１傾斜面１１２とそれぞれ対向するように）配置される。 The luminous flux control member 132 controls the light distribution of the light emitted from the light emitting element 131. The luminous flux control member 132 is arranged on the light emitting element 131 so that its central axis CA coincides with the optical axis OA of the light emitting element 131 (see FIG. 2B). The “optical axis OA of the light emitting element 131” means a light beam at the center of a three-dimensional emitted light flux from the light emitting element 131. The “central axis CA of the luminous flux control member 132” means, for example, a axis of symmetry that is twice symmetrical. Further, the luminous flux control member 132 emits the light emitted from the light emitting element 131 from the two emission surfaces 173 described later toward the two first inclined surfaces 112 (the two emission surfaces 173 described later have: (As opposed to each of the two first inclined surfaces 112).
　以下、各発光装置１３０について、発光素子１３１の発光中心を原点として、発光素子１３１の光軸ＯＡに平行な軸をＺ軸とし、Ｚ軸と直交し、複数の発光装置１３０が並ぶ方向（発光装置列１３０Ａに沿う方向）に平行な軸をＹ軸とし、Ｚ軸およびＹ軸と直交する軸をＸ軸とする。また、発光装置列１３０Ａの配列方向（複数の発光装置１３０の配置方向）を第１方向（Ｙ方向）とし、基板１２０の表面に沿い、第１方向に直交する方向を第２方向（Ｘ方向）とする。 Hereinafter, for each light emitting device 130, the light emitting center of the light emitting element 131 is set as the origin, the axis parallel to the optical axis OA of the light emitting element 131 is set as the Z axis, and the direction orthogonal to the Z axis is arranged (light emitting). The axis parallel to the device row 130A) is defined as the Y axis, and the Z axis and the axis orthogonal to the Y axis are defined as the X axis. Further, the arrangement direction of the light emitting device row 130A (the arrangement direction of the plurality of light emitting devices 130) is set as the first direction (Y direction), and the direction orthogonal to the first direction along the surface of the substrate 120 is the second direction (X direction). ).
　光束制御部材１３２の材料は、所望の波長の光を通過させ得るものであれば特に限定されない。たとえば、光束制御部材１３２の材料は、ポリメタクリル酸メチル（ＰＭＭＡ）やポリカーボネート（ＰＣ）、エポキシ樹脂（ＥＰ）などの光透過性樹脂、またはガラスである。 The material of the luminous flux control member 132 is not particularly limited as long as it can pass light of a desired wavelength. For example, the material of the light beam control member 132 is a light-transmitting resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), epoxy resin (EP), or glass.
　図３Ａ～Ｅは、光束制御部材１３２の構成を示す図である。図３Ａは、光束制御部材１３２の平面図であり、図３Ｂは、正面図であり、図３Ｃは、底面図であり、図３Ｄは、側面図であり、図３Ｅは、図３Ａに示されるＡ－Ａ線の断面図である。なお、以下の説明では、基板１２０側（発光素子１３１側）を「裏側」、光拡散板１５０側を「表側」とする。 3A to 3E are views showing the configuration of the luminous flux control member 132. 3A is a plan view of the luminous flux control member 132, FIG. 3B is a front view, FIG. 3C is a bottom view, FIG. 3D is a side view, and FIG. 3E is shown in FIG. 3A. It is sectional drawing of line AA. In the following description, the substrate 120 side (light emitting element 131 side) is referred to as the “back side”, and the light diffusing plate 150 side is referred to as the “front side”.
　光束制御部材１３２は、発光素子１３１から出射された光の配光を制御する。図３Ａ～Ｅに示されるように、光束制御部材１３２は、入射面１７１と、２つの反射面１７２と、２つの出射面１７３と、２つの鍔部１７４と、４つの脚部１７５とを有する。 The luminous flux control member 132 controls the light distribution of the light emitted from the light emitting element 131. As shown in FIGS. 3A to 3E, the luminous flux control member 132 has an incident surface 171, two reflecting surfaces 172, two emitting surfaces 173, two flange portions 174, and four leg portions 175. ..
　入射面１７１は、発光素子１３１から出射された光を入射させる。入射面１７１は、光軸ＯＡと交わるように、光束制御部材１３２の裏側（反射板１４０側、裏面１７６）に配置されている。入射面１７１の形状は、上記の機能を発揮できれば、特に限定されない。入射面１７１の形状は、平面であってもよいし、裏面１７６に開口した凹部１７７の内面であってもよい。本実施の形態では、入射面１７１は、裏面１７６に開口した凹部１７７の内面である。 The incident surface 171 is incident with the light emitted from the light emitting element 131. The incident surface 171 is arranged on the back side (reflector 140 side, back surface 176) of the luminous flux control member 132 so as to intersect the optical axis OA. The shape of the incident surface 171 is not particularly limited as long as it can exhibit the above functions. The shape of the incident surface 171 may be a flat surface or an inner surface of a recess 177 opened in the back surface 176. In the present embodiment, the incident surface 171 is the inner surface of the recess 177 opened in the back surface 176.
　凹部１７７の形状も、特に限定されない。本実施の形態では、凹部１７７は、内天面１７７ａ（第１入射面）と、それを挟んでＸ軸方向において対向した内側面１７７ｂ（第２入射面）とを有する。内天面１７７ａ（第１入射面）および内側面１７７ｂ（第２入射面）の数は、特に限定されず、それぞれ１つであってもよいし、２つ以上であってもよい。本実施の形態では、内天面１７７ａおよび内側面１７７ｂの数は、それぞれ２つである。 The shape of the recess 177 is also not particularly limited. In the present embodiment, the recess 177 has an inner top surface 177a (first incident surface) and an inner surface 177b (second incident surface) that faces the inner surface 177a in the X-axis direction with the inner surface 177a (first incident surface). The number of the inner surface surface 177a (first incident surface) and the inner surface surface 177b (second incident surface) is not particularly limited, and may be one or two or more, respectively. In the present embodiment, the number of the inner top surface 177a and the inner surface surface 177b is two, respectively.
　内天面１７７ａ（第１入射面）および内側面１７７ｂ（第２入射面）は、それぞれ平面であってもよいし、曲面であってもよい。本実施の形態では、内天面１７７ａは、入射した光を反射面１７２に到達させやすくする観点などから、光軸ＯＡおよびＸ軸を含む断面（仮想断面）において裏側に凸となるような曲面であり、内側面１７７ｂは、平面である。凹部１７７の内面（入射面１７１）は、他の面をさらに有していてもよい。 The inner top surface 177a (first incident surface) and the inner surface 177b (second incident surface) may be flat or curved, respectively. In the present embodiment, the inner top surface 177a is a curved surface that is convex to the back side in a cross section (virtual cross section) including the optical axis OA and the X axis from the viewpoint of facilitating the incident light reaching the reflecting surface 172. The inner side surface 177b is a flat surface. The inner surface (incident surface 171) of the recess 177 may further have another surface.
　２つの反射面１７２は、入射面１７１を挟んで発光素子１３１と対向する位置（表側）に配置されている。また、２つの反射面１７２は、少なくとも内天面１７７ａで入射した光の少なくとも一部を、発光素子１３１の光軸ＯＡと略垂直であり、かつ互いに略反対向きである２つの方向（いずれもＸ軸に沿う方向）に反射させる。２つの反射面１７２は、上記仮想断面において、光軸ＯＡから離れるにつれ、Ｘ軸から離れるようにそれぞれ形成されている。具体的には、２つの反射面１７２は、仮想断面において、発光素子１３１の光軸ＯＡから端部（出射面１７３）に向かうにつれて、接線の傾きが徐々に小さくなるように（Ｘ軸に沿うように）それぞれ形成されている。 The two reflecting surfaces 172 are arranged at positions (front side) facing the light emitting element 131 with the incident surface 171 in between. Further, the two reflecting surfaces 172 have at least a part of the light incident on the inner surface surface 177a in two directions (both of which are substantially perpendicular to the optical axis OA of the light emitting element 131 and substantially opposite to each other). Reflect in the direction along the X axis). In the above virtual cross section, the two reflecting surfaces 172 are formed so as to be separated from the X-axis as they are separated from the optical axis OA. Specifically, in the virtual cross section of the two reflecting surfaces 172, the inclination of the tangent line gradually decreases (along the X axis) from the optical axis OA of the light emitting element 131 toward the end (exit surface 173). Like) each is formed.
　２つの出射面１７３は、２つの反射面１７２を挟んで（Ｘ軸方向に）対向して配置されている。２つの出射面１７３は、内天面１７７ａで入射し、反射面１７２で反射した光と、内側面１７７ｂで入射し、直接到達した光とを、それぞれ外部に（筐体１１０の第１傾斜面１１２に向かって）出射させる。 The two exit surfaces 173 are arranged so as to face each other (in the X-axis direction) with the two reflection surfaces 172 in between. The two exit surfaces 173 allow light incident on the inner top surface 177a and reflected by the reflection surface 172 and light incident on the inner surface 177b and directly arriving to the outside (first inclined surface of the housing 110). (Toward 112).
　出射面１７３は、平面であってもよいし、曲面であってもよい。本実施の形態では、出射面１７３は、仮想断面において、光軸ＯＡと略平行な面である。「光軸ＯＡと略平行」とは、仮想断面において、光軸ＯＡと出射面１７３とのなす角度のうち小さいほうの角度が３°以下であることを意味する。なお、出射面１７３が曲面である場合には、光軸ＯＡと出射面１７３とのなす角度のうち小さいほうの角度は、仮想断面において、光軸ＯＡと、出射面１７３の仮想断面における曲線の接線とのなす角度のうち小さいほうの角度を意味する。 The exit surface 173 may be a flat surface or a curved surface. In the present embodiment, the exit surface 173 is a surface substantially parallel to the optical axis OA in the virtual cross section. “Approximately parallel to the optical axis OA” means that the smaller angle between the optical axis OA and the exit surface 173 is 3 ° or less in the virtual cross section. When the exit surface 173 is a curved surface, the smaller angle between the optical axis OA and the exit surface 173 is the curve of the optical axis OA and the virtual cross section of the exit surface 173 in the virtual cross section. It means the smaller angle of the angle formed by the tangent line.
　２つの鍔部１７４は、光軸ＯＡ近傍の２つの反射面１７２の間において、光軸ＯＡに対してＹ軸方向に突出するように配置されている。鍔部１７４は、光束制御部材１３２の取り扱いおよび位置合わせを容易にさせる。なお、鍔部１７４の形状は、鍔部１７４に入射した光を制御して出射できるような形状でもよい。 The two flange portions 174 are arranged so as to project in the Y-axis direction with respect to the optical axis OA between the two reflecting surfaces 172 near the optical axis OA. The flange portion 174 facilitates the handling and alignment of the luminous flux control member 132. The shape of the collar portion 174 may be a shape that can control and emit the light incident on the collar portion 174.
　４つの脚部１７５は、裏面１７６から突出している略円柱状の部材である。脚部１７５は、発光素子１３１に対して適切な位置に光束制御部材１３２を支持する（図２Ｂ参照）。脚部１７５は、基板１２０に形成した穴部に嵌合させて位置決めに用いてもよい。また、脚部１７５は、光学的に悪影響がおよばないように考慮された上で、光束制御部材１３２を基板１２０に安定して固定できればよく、脚部１７５の位置、形状および数は、特に限定されない。本実施の形態では、脚部１７５は、裏面１７６において、入射面１７１の周囲に合計４つ配置されている。 The four legs 175 are substantially columnar members protruding from the back surface 176. The leg portion 175 supports the luminous flux control member 132 at an appropriate position with respect to the light emitting element 131 (see FIG. 2B). The leg portion 175 may be fitted into a hole portion formed in the substrate 120 and used for positioning. Further, the legs 175 need only be able to stably fix the luminous flux control member 132 to the substrate 120 in consideration of not having an adverse effect optically, and the position, shape and number of the legs 175 are particularly limited. Not done. In the present embodiment, a total of four legs 175 are arranged around the incident surface 171 on the back surface 176.
　反射板１４０は、発光装置列１３０Ａから出射された光の反射量を調整する反射調整部１４１を有する。反射調整部１４１の数は、特に限定されない。本実施の形態では、反射調整部１４１は、底板１１１上であって、第２の方向（Ｘ軸に沿う方向）において発光装置列１３０Ａを挟むように、発光装置列１３０Ａの両側にそれぞれ１つずつ配置されている。 The reflector 140 has a reflection adjusting unit 141 that adjusts the amount of reflection of the light emitted from the light emitting device row 130A. The number of reflection adjusting units 141 is not particularly limited. In the present embodiment, there is one reflection adjusting unit 141 on both sides of the light emitting device row 130A on the bottom plate 111 so as to sandwich the light emitting device row 130A in the second direction (direction along the X axis). They are arranged one by one.
　２つの反射調整部１４１は、底面１１１ａ上の、光束制御部材１３２から出射される光が到達する、底面１１１ａの一部の領域に配置されている（図４ＡおよびＢ参照）。本実施の形態では、２つの反射調整部１４１は、光束制御部材１３２の２つの出射面１７３が対向する方向（Ｘ軸方向）において、底面１１１ａ上の、光束制御部材１３２を挟んだ両側に配置されている。反射調整部１４１には、発光素子１３１の側面の上端部から出射される光に起因して光束制御部材１３２の出射面１７３の上端部付近から出射され、底面１１１ａに到達する黄色味の強い光（長波長側の光）が到達する。 The two reflection adjusting units 141 are arranged on the bottom surface 111a in a part of the bottom surface 111a where the light emitted from the luminous flux control member 132 reaches (see FIGS. 4A and 4B). In the present embodiment, the two reflection adjusting units 141 are arranged on the bottom surface 111a on both sides of the luminous flux control member 132 in the direction in which the two exit surfaces 173 of the luminous flux control member 132 face each other (X-axis direction). Has been done. The reflection adjusting unit 141 emits light emitted from the upper end portion of the side surface of the light emitting element 131, and is emitted from the vicinity of the upper end portion of the emitting surface 173 of the luminous flux control member 132, and reaches the bottom surface 111a with a strong yellowish light. (Light on the long wavelength side) arrives.
　なお、反射調整部１４１は、底面１１１ａ上において、光束制御部材１３２に対して、２つの出射面１７３が対向する方向と直交する方向（Ｙ軸方向）の一方または両方には配置されていない（図２ＡおよびＢ参照）。光束制御部材１３２からＹ軸方向に出射される光は、出射面１７３から出射される光と比べて底面１１１ａ上で反射されにくく、輝度に対する寄与も少ないからである。 The reflection adjusting unit 141 is not arranged on the bottom surface 111a in one or both of the directions (Y-axis direction) orthogonal to the direction in which the two emission surfaces 173 face each other with respect to the luminous flux control member 132. 2 A and B). This is because the light emitted from the luminous flux control member 132 in the Y-axis direction is less likely to be reflected on the bottom surface 111a than the light emitted from the emission surface 173, and contributes less to the brightness.
　反射調整部１４１は、第１反射部１４１Ａと、第２反射部１４１Ｂとを有する。第１反射部１４１Ａおよび第２反射部１４１Ｂは、第１方向に沿って交互に配置されている。第１反射部１４１Ａは、発光装置列１３０Ａから出射された光を光拡散板１５０に向けて反射させる。第１反射部１４１Ａは、反射板１４０の表面の一部である。 The reflection adjusting unit 141 has a first reflection unit 141A and a second reflection unit 141B. The first reflecting portion 141A and the second reflecting portion 141B are alternately arranged along the first direction. The first reflecting unit 141A reflects the light emitted from the light emitting device row 130A toward the light diffusing plate 150. The first reflecting portion 141A is a part of the surface of the reflecting plate 140.
　図４Ａに示されるように、第１反射部１４１Ａおよび第２反射部１４１Ｂは、第１方向に沿って交互に配置されている。図４Ａに示す例では、発光装置１３０を挟んで対抗する位置に第１反射部１４１Ａまたは第２反射部１４１Ｂがそれぞれ配置されている。なお、発光装置１３０は、第１反射部１４１Ａおよび第２反射部１４１Ｂで挟まれるように配置されていてもよい。 As shown in FIG. 4A, the first reflecting portion 141A and the second reflecting portion 141B are alternately arranged along the first direction. In the example shown in FIG. 4A, the first reflection unit 141A or the second reflection unit 141B are arranged at positions facing each other with the light emitting device 130 sandwiched between them. The light emitting device 130 may be arranged so as to be sandwiched between the first reflecting portion 141A and the second reflecting portion 141B.
　図４Ｂに示されるように、第２反射部１４１Ｂが第１方向において、所定の周期で蛇行するように配置されていてもよい。この場合、第１の方向において、第２反射部１４１Ｂがない領域が第１反射部１４１Ａとなる。 As shown in FIG. 4B, the second reflecting portion 141B may be arranged so as to meander at a predetermined cycle in the first direction. In this case, in the first direction, the region without the second reflecting portion 141B becomes the first reflecting portion 141A.
　第１反射部１４１Ａにおける波長５５０ｎｍの光の反射率をＲ１５５０、波長６３０ｎｍの光の反射率をＲ１６３０とし、第２反射部１４１Ｂにおける波長４５０ｎｍの光の反射率をＲ２４５０、波長５５０ｎｍの光の反射率をＲ２５５０、波長６３０ｎｍの光の反射率をＲ２６３０としたとき、第１反射部１４１Ａおよび第２反射部１４１Ｂは、下記式（１）～式（３）を満たすことが好ましい。
　Ｒ１５５０＞Ｒ２５５０　　式（１）
　Ｒ１６３０＞Ｒ２６３０　　式（２）
　Ｒ２４５０＞Ｒ２５５０、Ｒ２６３０≧６０％　　式（３） The reflectance of light having a wavelength of 550 nm in the first reflecting unit 141A is R1 550 , the reflectance of light having a wavelength of 630 nm is R1 630, and the reflectance of light having a wavelength of 450 nm in the second reflecting unit 141B is R2 450 , light having a wavelength of 550 nm. When the reflectance of the above is R2 550 and the reflectance of light having a wavelength of 630 nm is R2 630 , the first reflecting portion 141A and the second reflecting portion 141B preferably satisfy the following formulas (1) to (3).
R1 550 > R2 550 formula (1)
R1 630 > R2 630 formula (2)
R2 450 > R2 550 , R2 630 ≥ 60% Equation (3)
　式（１）に示されるように、第１反射部１４１Ａの長波長側（黄色域）の反射率Ｒ１５５０、Ｒ１６３０は、第２反射部１４１Ｂの長波長側（黄色域）の反射率Ｒ２５５０、Ｒ２６３０よりも高い。つまり、第１反射部１４１Ａでは、光束制御部材１３２の出射面１７３から出射される光の反射率が維持されるため、輝度の低下を抑制できる。 As shown in the formula (1), the reflectances R1 550 and R1 630 on the long wavelength side (yellow region) of the first reflecting portion 141A are the reflectance R2 on the long wavelength side (yellow region) of the second reflecting portion 141B. 550 , higher than R2 630 . That is, in the first reflecting unit 141A, the reflectance of the light emitted from the emitting surface 173 of the luminous flux control member 132 is maintained, so that the decrease in brightness can be suppressed.
　第２反射部１４１Ｂは、第１反射部１４１Ａよりも反射率が低い。すなわち、第２反射部１４１Ｂは、発光装置列１３０Ａからの光を減少させて、光拡散板１５０に向けて反射させる。第２反射部１４１Ｂは、反射減少層１４２が島状に配置されている。第２反射部１４１Ｂの全体に対する反射減少層１４２の割合を調整することで、第２反射部１４１Ｂの反射率を調整できる。本実施の形態では、反射減少層１４２の平面視形状は、円形である。また、反射減少層１４２は、発光装置列１３０Ａから離れるにつれて、その表面積が小さくなるように形成されている。反射減少層１４２の色は、特に限定されない。反射減少層１４２の色は、反射調整部１４１の色に応じて適宜選択される。 The second reflecting unit 141B has a lower reflectance than the first reflecting unit 141A. That is, the second reflecting unit 141B reduces the light from the light emitting device row 130A and reflects it toward the light diffusing plate 150. In the second reflection portion 141B, the reflection reduction layer 142 is arranged in an island shape. The reflectance of the second reflecting portion 141B can be adjusted by adjusting the ratio of the reflection reducing layer 142 to the entire second reflecting portion 141B. In the present embodiment, the plan view shape of the reflection reduction layer 142 is circular. Further, the reflection reduction layer 142 is formed so that its surface area becomes smaller as the distance from the light emitting device row 130A increases. The color of the reflection reduction layer 142 is not particularly limited. The color of the reflection reduction layer 142 is appropriately selected according to the color of the reflection adjustment unit 141.
　式（３）に示されるように、長波長側（例えば黄色域）の反射率を、短波長側の反射率（例えば青色域）よりも低くする。それにより、発光素子１３１の側面から出射された光に起因して、光束制御部材１３２の出射面１７３の上端部付近から出射され、底面１１１ａに到達する光のうち黄色味の強い光を、第２反射部１４１Ｂで多く吸収させることができる。それにより、当該光束制御部材１３２の出射面１７３の上端部付近から出射され、底面１１１ａ上で反射される光の黄色味を低減することができる。また、これらの反射率を６０％以上とすることで、輝度の低下を抑制できる。 As shown in the formula (3), the reflectance on the long wavelength side (for example, the yellow region) is made lower than the reflectance on the short wavelength side (for example, the blue region). As a result, the light emitted from the side surface of the light emitting element 131, which is emitted from the vicinity of the upper end portion of the emission surface 173 of the luminous flux control member 132, and reaches the bottom surface 111a, is the light having a strong yellowish color. A large amount can be absorbed by the two reflecting portions 141B. As a result, the yellowness of the light emitted from the vicinity of the upper end portion of the emission surface 173 of the luminous flux control member 132 and reflected on the bottom surface 111a can be reduced. Further, by setting these reflectances to 60% or more, it is possible to suppress a decrease in brightness.
　第２反射部１４１Ｂの反射率Ｒ２４５０、Ｒ２５５０およびＲ２６３０は、輝度の低下を一層抑制しやすくする観点では、低すぎないことが好ましく、８０％以上がより好ましい。 The reflectances R2 450 , R2 550 and R2 630 of the second reflecting portion 141B are preferably not too low, and more preferably 80% or more, from the viewpoint of making it easier to suppress the decrease in brightness.
　次に、隣接する発光装置１３０間の中心間距離と、隣接する第１反射部１４１Ａおよび第２反射部１４１Ｂの合計の繰り返し長さとの関係について説明する。図５Ａ、Ｂは、隣接する発光素子１３１間の中心間距離と、隣接する第１反射部１４１Ａおよび第２反射部１４１Ｂの合計の繰り返し長さとの関係を示す図である。 Next, the relationship between the center-to-center distance between the adjacent light emitting devices 130 and the total repeating length of the adjacent first reflecting unit 141A and second reflecting unit 141B will be described. 5A and 5B are diagrams showing the relationship between the center-to-center distance between adjacent light emitting elements 131 and the total repeating length of the adjacent first reflecting portion 141A and second reflecting portion 141B.
　第１方向において、隣接する２つの発光装置１３０間の中心間距離は、隣接する第１反射部１４１Ａおよび第２反射部１４１Ｂの合計の繰り返し長さと異なる。具体的には、図５Ａに示されるように、第１方向において、隣接する２つの発光装置１３０の中心間距離Ｐ１は、隣接する第１反射部１４１Ａおよび第２反射部１４１Ｂの合計の繰り返し長さＰ２より、短くてもよい。また、図５Ｂに示されるように、Ｐ１は、Ｐ２より長くてもよい。また、特に図示しないが、Ｐ１はＰ２の倍数ではなく、Ｐ２はＰ１の倍数でもないことが好ましい。このように、発光装置１３０と、第１反射部１４１Ａまたは第２反射部１４１Ｂとは、対応して配置されていないため、帯状に発生する明部の視認性を抑制できる。 In the first direction, the center-to-center distance between two adjacent light emitting devices 130 is different from the total repeating length of the adjacent first reflecting unit 141A and second reflecting unit 141B. Specifically, as shown in FIG. 5A, in the first direction, the center-to-center distance P1 of the two adjacent light emitting devices 130 is the total repeating length of the adjacent first reflecting portion 141A and the second reflecting portion 141B. It may be shorter than P2. Also, as shown in FIG. 5B, P1 may be longer than P2. Further, although not particularly shown, it is preferable that P1 is not a multiple of P2 and P2 is not a multiple of P1. As described above, since the light emitting device 130 and the first reflecting portion 141A or the second reflecting portion 141B are not arranged so as to correspond to each other, the visibility of the bright portion generated in a band shape can be suppressed.
　光拡散板１５０は、筐体１１０の開口部を覆うように配置されている。光拡散板１５０は、光透過性および光拡散性を有する板状の部材であり、光束制御部材１３２の出射面１７３からの出射光を拡散させつつ透過させる。光拡散板１５０は、例えば面光源装置１００の発光面となりうる。 The light diffusing plate 150 is arranged so as to cover the opening of the housing 110. The light diffusing plate 150 is a plate-shaped member having light transmissivity and light diffusing property, and transmits the emitted light from the emitting surface 173 of the luminous flux control member 132 while diffusing it. The light diffusing plate 150 can be, for example, a light emitting surface of the surface light source device 100.
　光拡散板１５０の材料は、光束制御部材１３２の出射面１７３からの出射光を拡散させつつ透過させ得るものであれば適宜選択できる。光拡散板１５０の材料の例には、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が含まれる。光拡散性を付与するため、光拡散板１５０は、その表面に微細な凹凸が形成されているか、または光拡散板１５０の内部にビーズなどの光拡散子が分散している。 The material of the light diffusing plate 150 can be appropriately selected as long as it can transmit the light emitted from the emitting surface 173 of the light flux control member 132 while diffusing it. Examples of the material of the light diffusing plate 150 include a light transmissive resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene (PS), and styrene / methyl methacrylate copolymer resin (MS). In order to impart light diffusivity, the light diffusing plate 150 has fine irregularities formed on its surface, or light diffusing elements such as beads are dispersed inside the light diffusing plate 150.
　本実施の形態に係る面光源装置１００では、各発光素子１３１から出射された光は、光束制御部材１３２により光拡散板１５０の広範囲を照らすように、特に第１傾斜面１１２へ向かう光（発光素子１３１の光軸ＯＡに対して略垂直方向に、かつ互いに略反対向きである２つの方向（図３ＡにおけるＸ軸方向）に向かう光）に変えられて出射される。発光装置１３０から出射された光の一部は、第１傾斜面１１２で反射されて、光拡散板１５０に到達する。また、発光装置１３０から出射された光の他の一部は、底面１１１ａ上で反射されて、光拡散板１５０に到達する。光拡散板１５０に到達したこれらの光は、光拡散板１５０によりさらに拡散されて、外部に出射される。それにより、面光源装置１００の面全体に光を行き渡らせることができる。 In the surface light source device 100 according to the present embodiment, the light emitted from each light emitting element 131 is light (light emission) particularly directed to the first inclined surface 112 so as to illuminate a wide range of the light diffusing plate 150 by the luminous flux control member 132. Light is emitted in two directions (the X-axis direction in FIG. 3A) that are substantially perpendicular to the optical axis OA of the element 131 and that are substantially opposite to each other. A part of the light emitted from the light emitting device 130 is reflected by the first inclined surface 112 and reaches the light diffusing plate 150. Further, the other part of the light emitted from the light emitting device 130 is reflected on the bottom surface 111a and reaches the light diffusing plate 150. These lights that have reached the light diffusing plate 150 are further diffused by the light diffusing plate 150 and emitted to the outside. As a result, the light can be distributed over the entire surface of the surface light source device 100.
　（効果）
　以上のように、本実施の形態に係る面光源装置１００では、発光装置１３０の配置と、第２反射部１４１Ｂの配置が一致しておらず、かつ発光装置１３０の配列方向において、光の反射率が一定でないため、光拡散板１５０上における輝度ムラを抑制できる。 (effect)
As described above, in the surface light source device 100 according to the present embodiment, the arrangement of the light emitting device 130 and the arrangement of the second reflecting unit 141B do not match, and the light is reflected in the arrangement direction of the light emitting device 130. Since the rate is not constant, uneven brightness on the light diffusing plate 150 can be suppressed.
　［実施の形態２］
　（面光源装置の構成）
　実施の形態２に係る面光源装置２００は、発光装置列１３０Ａおよび反射調整部１４１の数のみが実施の形態１に係る面光源装置１００と異なる。そこで、実施の形態１に係る面光源装置１００と同様の構成については、同様の符号を付してその説明を省略する。 [Embodiment 2]
(Configuration of surface light source device)
The surface light source device 200 according to the second embodiment differs from the surface light source device 100 according to the first embodiment only in the number of the light emitting device row 130A and the reflection adjusting unit 141. Therefore, the same configuration as the surface light source device 100 according to the first embodiment is designated by the same reference numerals and the description thereof will be omitted.
　図６は、実施の形態２に係る、光拡散板１５０を外した面光源装置２００の平面図である。図６に示されるように、本実施の形態に係る面光源装置２００は、筐体１１０と、基板１２０と、発光装置列１３０Ａと、反射板１４０と、光拡散板１５０（図示省略）とを有する。 FIG. 6 is a plan view of the surface light source device 200 from which the light diffusing plate 150 is removed according to the second embodiment. As shown in FIG. 6, the surface light source device 200 according to the present embodiment includes a housing 110, a substrate 120, a light emitting device row 130A, a reflector 140, and a light diffusing plate 150 (not shown). Have.
　本実施の形態では、発光装置列１３０Ａは、基板１２０の表面に沿い、第１方向（Ｙ軸方向）に直交する第２方向（Ｘ軸方向）に複数配列されている。本実施の形態では、発光装置列１３０Ａの数は、２列である。また、複数（２列）の発光装置列１３０Ａを第２方向からみたときに、一の発光装置列１３０Ａに含まれる発光装置１３０のそれぞれは、他の発光装置列１３０Ａに含まれるいずれの発光装置１３０とも一致していない。一の発光装置列１３０Ａと、隣接する他の発光装置列１３０Ａとの間隔は、特に限定されない。一の発光装置列１３０Ａと、隣接する他の発光装置列１３０Ａとの間隔は、面光源装置２００の発光領域の大きさによって適宜設定される。 In the present embodiment, a plurality of light emitting device rows 130A are arranged along the surface of the substrate 120 in the second direction (X-axis direction) orthogonal to the first direction (Y-axis direction). In this embodiment, the number of light emitting device rows 130A is two rows. Further, when a plurality of (two rows) light emitting device rows 130A are viewed from the second direction, each of the light emitting devices 130 included in one light emitting device row 130A is any light emitting device included in the other light emitting device row 130A. It does not match 130. The distance between one light emitting device row 130A and another adjacent light emitting device row 130A is not particularly limited. The distance between one light emitting device row 130A and another adjacent light emitting device row 130A is appropriately set according to the size of the light emitting region of the surface light source device 200.
　反射板１４０は、複数の反射調整部１４１を有する。本実施の形態では、反射調整部１４１は、光束制御部材１３２の２つの出射面が対向する方向（Ｘ軸方向）において、底面１１１ａ上の、光束制御部材１３２を挟んだ両側に２つずつ配置されている。 The reflector 140 has a plurality of reflection adjusting units 141. In the present embodiment, two reflection adjustment units 141 are arranged on the bottom surface 111a on both sides of the light flux control member 132 in the direction in which the two emission surfaces of the light flux control member 132 face each other (X-axis direction). Has been done.
　一の反射調整部１４１は、複数の第１反射部１４１Ａと、複数の第２反射部１４１Ｂとが第１方向において交互に一列に配置されている（図６の破線で波込まれた領域参照）。反射調整部１４１は、第２方向（Ｘ軸方向）に複数配列されている。複数の反射調整部１４１を第２方向に沿ってみたときに、一の反射調整部１４１における複数の第１反射部１４１Ａおよび複数の第２反射部１４１Ｂのそれぞれは、他の反射調整部１４１における複数の第１反射部１４１Ａおよび複数の第２反射部１４１Ｂのそれぞれと一致していない。 In one reflection adjusting unit 141, a plurality of first reflection units 141A and a plurality of second reflection units 141B are alternately arranged in a row in the first direction (see the region wavy by the broken line in FIG. 6). ). A plurality of reflection adjusting units 141 are arranged in the second direction (X-axis direction). When the plurality of reflection adjusting units 141 are viewed along the second direction, each of the plurality of first reflection units 141A and the plurality of second reflection units 141B in one reflection adjustment unit 141 is in the other reflection adjustment unit 141. It does not match each of the plurality of first reflecting portions 141A and the plurality of second reflecting portions 141B.
　この場合においても、一の反射調整部１４１における第１反射部１４１Ａおよび第２反射部１４１Ｂは、第１方向に沿って交互に配置されており、第１方向において、隣接する２つの発光装置１３０間の中心間距離は、隣接する第１反射部１４１Ａおよび第２反射部１４１Ｂの合計の繰り返し長さと異なる。第１方向において、隣接する２つの発光装置１３０の中心間距離は、隣接する第１反射部１４１Ａおよび第２反射部１４１Ｂの合計の繰り返し長さより、短くてもよいし、長くてもよい。 Also in this case, the first reflection unit 141A and the second reflection unit 141B in the one reflection adjustment unit 141 are alternately arranged along the first direction, and the two adjacent light emitting devices 130 in the first direction. The distance between the centers is different from the total repeating length of the adjacent first reflecting portion 141A and second reflecting portion 141B. In the first direction, the distance between the centers of the two adjacent light emitting devices 130 may be shorter or longer than the total repeating length of the adjacent first reflecting unit 141A and the second reflecting unit 141B.
　（効果）
　以上のように、本実施の形態に係る面光源装置２００では、本実施の形態に係る面光源装置１００と同様の効果を有する。 (effect)
As described above, the surface light source device 200 according to the present embodiment has the same effect as the surface light source device 100 according to the present embodiment.
　本出願は、２０１９年３月２７日出願の特願２０１９－０６０６７８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. 2019-060678 filed on March 27, 2019. All the contents described in the application specification and drawings are incorporated herein by reference.
　本発明に係る光束制御部材を有する面光源装置は、例えば、液晶表示装置のバックライトや看板、一般照明などに適用できる。 The surface light source device having the luminous flux control member according to the present invention can be applied to, for example, a backlight of a liquid crystal display device, a signboard, general lighting, and the like.
　１００、２００　面光源装置
　１００’　表示装置
　１１０　筐体
　１１１　底板
　１１１ａ　底面
　１１２　第１傾斜面
　１１３　第２傾斜面
　１２０　基板
　１３０　発光装置
　１３０Ａ　発光装置列
　１３１　発光素子
　１３２　光束制御部材
　１４０　反射板
　１４１　反射調整部
　１４１Ａ　第１反射部
　１４１Ｂ　第２反射部
　１４２　反射減少層
　１５０　光拡散板
　１６０　表示部材（被照射部材）
　１７１　入射面
　１７２　反射面
　１７３　出射面
　１７４　鍔部
　１７５　脚部
　１７６　裏面
　１７７　凹部
　１７７ａ　内天面
　１７７ｂ　内側面 100, 200 surface light source device 100'display device 110 housing 111 bottom plate 111a bottom surface 112 first inclined surface 113 second inclined surface 120 substrate 130 light emitting device 130A light emitting device row 131 light emitting element 132 light flux control member 140 reflector 141 reflection adjustment unit 141A 1st reflector 141B 2nd reflector 142 Reflection reduction layer 150 Light diffuser 160 Display member (irradiated member)
171 Incident surface 172 Reflective surface 173 Exit surface 174 Brim part 175 Leg 176 Back surface 177 Recessed 177a Inner top surface 177b Inner surface

Claims (5)

  1. 　底板および前記底板の反対側に配置された開口部を有する筐体と、
    　前記底板上において、第１方向に配列された発光装置列と、
    　前記底板上に配置され、前記発光装置列から出射された光を反射させる反射板と、
    　前記開口部を覆うように配置され、前記発光装置列からの光を拡散させつつ透過させる光拡散板と、
    　を有し、
    　前記発光装置列は、発光素子および前記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をそれぞれ含む複数の発光装置が、前記第１方向に一定の間隔で配置されており、
    　前記光束制御部材は、
    　前記発光素子から出射された光を入射させる前記底板側に形成された入射面と、
    　前記入射面で入射した光の少なくとも一部を、前記反射板に沿い、かつ前記第１方向に直交する第２方向に沿い、かつ互いに略反対向きである方向に反射させる前記光拡散板側に形成された２つの反射面と、
    　前記反射面で反射した光を外部に出射させる２つの出射面と
    　を含み、
    　前記反射板は、前記第１方向に沿って、前記発光装置列と平行に配置され、前記発光装置列から出射された光の反射量を調整する反射調整部を有し、
    　前記反射調整部は、
    　前記発光装置列から出射された光を前記光拡散板に向けて反射させる第１反射部と、
    　前記第１反射部よりも反射率の低い第２反射部と、
    　を含み、
    　前記第１反射部および前記第２反射部は、前記第１方向に沿って交互に配置されており、
    　前記第１方向において、隣接する２つの前記発光装置間の中心間距離は、隣接する前記第１反射部および前記第２反射部の合計の繰り返し長さと異なる、
    　面光源装置。     A housing with a bottom plate and an opening located on the opposite side of the bottom plate,
    On the bottom plate, a row of light emitting devices arranged in the first direction and
    A reflector arranged on the bottom plate and reflecting the light emitted from the light emitting device row,
    A light diffusing plate arranged so as to cover the opening and transmitting light from the light emitting device row while diffusing it.
    Have,
    In the light emitting device row, a plurality of light emitting devices including a light emitting element and a light flux control member for controlling the light distribution of light emitted from the light emitting element are arranged at regular intervals in the first direction.
    The luminous flux control member is
    An incident surface formed on the bottom plate side for incident light emitted from the light emitting element, and
    On the light diffusing plate side that reflects at least a part of the light incident on the incident surface along the reflecting plate, along the second direction orthogonal to the first direction, and in a direction substantially opposite to each other. The two reflective surfaces formed and
    Including two emitting surfaces that emit light reflected by the reflecting surface to the outside.
    The reflector is arranged in parallel with the light emitting device row along the first direction, and has a reflection adjusting unit for adjusting the amount of reflection of light emitted from the light emitting device row.
    The reflection adjusting unit is
    A first reflecting unit that reflects the light emitted from the light emitting device row toward the light diffusing plate, and
    The second reflecting part, which has a lower reflectance than the first reflecting part,
    Including
    The first reflecting portion and the second reflecting portion are alternately arranged along the first direction.
    In the first direction, the center-to-center distance between two adjacent light emitting devices differs from the total repeating length of the adjacent first reflecting portion and the second reflecting portion.
    Surface light source device.
  2. 　前記反射調整部は、前記第２方向に沿う方向において前記発光装置列を挟むように、前記発光装置列の両側にそれぞれ配置されている、請求項１に記載の面光源装置。 The surface light source device according to claim 1, wherein the reflection adjusting unit is arranged on both sides of the light emitting device row so as to sandwich the light emitting device row in a direction along the second direction.
  3. 　前記発光装置列は、前記第２方向に複数配列されており、
    　前記第２方向に沿ってみたときに、一の前記発光装置列における複数の発光装置は、他の前記発光装置列における複数の発光装置のそれぞれと一致しておらず、
    　前記反射調整部は、前記第２方向に複数配列されており、
    　前記第２方向に沿ってみたときに、一の前記反射調整部における複数の前記第１反射部および複数の前記第２反射部のそれぞれは、他の前記反射調整部における複数の前記第１反射部および複数の前記第２反射部のそれぞれと一致していない、
    　請求項１または請求項２に記載の面光源装置。     A plurality of the light emitting device rows are arranged in the second direction.
    When viewed along the second direction, the plurality of light emitting devices in one of the light emitting device rows does not match each of the plurality of light emitting devices in the other light emitting device row.
    A plurality of the reflection adjusting portions are arranged in the second direction.
    When viewed along the second direction, each of the plurality of first reflection portions and the plurality of second reflection portions in one reflection adjustment portion is each of the plurality of first reflections in the other reflection adjustment portion. Does not match each of the section and the plurality of second reflecting sections,
    The surface light source device according to claim 1 or 2.
  4. 　前記第１反射部における波長５５０ｎｍの光の反射率をＲ１５５０、波長６３０ｎｍの光の反射率をＲ１６３０とし、前記第２反射部における波長４５０ｎｍの光の反射率をＲ２４５０、波長５５０ｎｍの光の反射率をＲ２５５０、波長６３０ｎｍの光の反射率をＲ２６３０としたとき、
    　前記第１反射部および前記第２反射部は、下記式（１）～式（３）を満たす、
    　Ｒ１５５０＞Ｒ２５５０　　式（１）
    　Ｒ１６３０＞Ｒ２６３０　　式（２）
    　Ｒ２４５０＞Ｒ２５５０、Ｒ２６３０≧６０％　　式（３）
    　請求項１～３のいずれか一項に記載の面光源装置。     The reflectance of light having a wavelength of 550 nm in the first reflecting portion is R1 550 , the reflectance of light having a wavelength of 630 nm is R1 630 , the reflectance of light having a wavelength of 450 nm in the second reflecting portion is R2 450 , and the reflectance of light having a wavelength of 550 nm. When the reflectance of is R2 550 and the reflectance of light with a wavelength of 630 nm is R2 630 ,
    The first reflecting portion and the second reflecting portion satisfy the following equations (1) to (3).
    R1 550 > R2 550 formula (1)
    R1 630 > R2 630 formula (2)
    R2 450 > R2 550 , R2 630 ≥ 60% Equation (3)
    The surface light source device according to any one of claims 1 to 3.
  5. 　請求項１～４のいずれか一項に記載の面光源装置と、
    　前記光拡散板の上に配置された表示部材と、を有する、
    　表示装置。     The surface light source device according to any one of claims 1 to 4.
    It has a display member arranged on the light diffusing plate, and has.
    Display device.
PCT/JP2020/013185 2019-03-27 2020-03-25 Planar light source device, and display device WO2020196572A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007048883A (en) * 2005-08-09 2007-02-22 Koha Co Ltd Optical element for changing direction of light, light source unit for radiating light, and planar light emitting device employing it
JP2007080702A (en) * 2005-09-15 2007-03-29 Nec Lcd Technologies Ltd Backlight unit
WO2011142170A1 (en) * 2010-05-14 2011-11-17 シャープ株式会社 Illumination device, display device, television receiving device
WO2011148694A1 (en) * 2010-05-25 2011-12-01 シャープ株式会社 Illuminating device, display device, and television receiver
WO2013031674A1 (en) * 2011-08-31 2013-03-07 シャープ株式会社 Illumination device, display device, and television reception device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007048883A (en) * 2005-08-09 2007-02-22 Koha Co Ltd Optical element for changing direction of light, light source unit for radiating light, and planar light emitting device employing it
JP2007080702A (en) * 2005-09-15 2007-03-29 Nec Lcd Technologies Ltd Backlight unit
WO2011142170A1 (en) * 2010-05-14 2011-11-17 シャープ株式会社 Illumination device, display device, television receiving device
WO2011148694A1 (en) * 2010-05-25 2011-12-01 シャープ株式会社 Illuminating device, display device, and television receiver
WO2013031674A1 (en) * 2011-08-31 2013-03-07 シャープ株式会社 Illumination device, display device, and television reception device

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