WO2024034296A1 - 面状照明装置 - Google Patents

面状照明装置 Download PDF

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Publication number
WO2024034296A1
WO2024034296A1 PCT/JP2023/025062 JP2023025062W WO2024034296A1 WO 2024034296 A1 WO2024034296 A1 WO 2024034296A1 JP 2023025062 W JP2023025062 W JP 2023025062W WO 2024034296 A1 WO2024034296 A1 WO 2024034296A1
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WO
WIPO (PCT)
Prior art keywords
fresnel lens
linear fresnel
illumination device
light
spread
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2023/025062
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
銀河 伊藤
雅也 藤原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MinebeaMitsumi Inc
Original Assignee
MinebeaMitsumi Inc
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 MinebeaMitsumi Inc filed Critical MinebeaMitsumi Inc
Priority to JP2023570459A priority Critical patent/JP7588737B2/ja
Priority to CN202380058535.1A priority patent/CN119677989A/zh
Priority to EP23852279.1A priority patent/EP4571173A1/en
Priority to US19/101,954 priority patent/US20260049708A1/en
Publication of WO2024034296A1 publication Critical patent/WO2024034296A1/ja
Priority to JP2024123776A priority patent/JP7546185B1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
    • 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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/0083—Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements
    • F21Y2105/14—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements characterised by the overall shape of the two-dimensional [2D] array
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a spread illumination device.
  • a direct-type spread illumination device equipped with a linear Fresnel lens has been proposed (see, for example, Patent Document 1).
  • a linear Fresnel lens By using a linear Fresnel lens, light distribution is performed efficiently, and high brightness, high brightness uniformity, low power consumption, and thinness can be achieved.
  • planar light source has been proposed that suppresses brightness unevenness that occurs in the periphery when the planar shape (light-emitting surface shape) is an irregular shape (see, for example, Patent Document 2).
  • planar shape of a direct type spread illumination device equipped with a linear Fresnel lens is an irregular shape
  • there has been no study on eliminating the uneven brightness of the irregularly shaped portion and a solution has been desired.
  • a light source such as an LED (Light Emitting Diode) in a straight line along the condensing position (focal position) of the linear Fresnel lens.
  • a planar shape of the light-emitting area is non-rectangular, it is difficult to arrange the light source in a straight line along the light focusing position of the linear Fresnel lens, due to the structural limitations of the frame. As a result, brightness uniformity deteriorates due to the occurrence of dark areas.
  • the present invention has been made in view of the above, and an object of the present invention is to provide a spread illumination device that can prevent dark areas from occurring in irregularly shaped parts and improve brightness uniformity.
  • a spread illumination device is a direct type spread lighting device equipped with a linear Fresnel lens, and includes a plurality of light sources and a reflector. Equipped with.
  • the plurality of light sources are arranged linearly on the substrate along the condensing position of the linear Fresnel lens.
  • the reflector has a reflective surface surrounding each of the light sources to form a segment.
  • the segment of the reflector adjacent to the part is in the spread illumination device. is extended to the outer edge side.
  • the spread illumination device can prevent dark areas from occurring in irregularly shaped parts and can improve brightness uniformity.
  • FIG. 1 is an external perspective view of a spread illumination device according to an embodiment.
  • FIG. 2 is an exploded perspective view of the main parts of the spread illumination device.
  • FIG. 3 is a plan view of the reflector.
  • FIG. 4 is a diagram schematically showing the light emitting area of the spread illumination device and the light collecting position where the light source is arranged.
  • FIG. 5 is a sectional view of the spread illumination device corresponding to the XX section in FIG. 4.
  • FIG. 6 is an enlarged view of the extension of the condenser lens.
  • FIG. 7 is a diagram (1) illustrating an example in which a dark area occurs in a comparative example of a spread illumination device due to an irregular plan shape that is not rectangular.
  • FIG. 1 is an external perspective view of a spread illumination device according to an embodiment.
  • FIG. 2 is an exploded perspective view of the main parts of the spread illumination device.
  • FIG. 3 is a plan view of the reflector.
  • FIG. 4 is a diagram schematically showing the light
  • FIG. 8 is a diagram (2) illustrating an example in which dark areas occur in the comparative example spread illumination device due to the planar shape being an irregular shape that is not rectangular.
  • FIG. 9 is a diagram illustrating an example of a light emitting area of a spread illumination device of a comparative example and a light condensing position where a light source is arranged.
  • FIG. 10 is a sectional view of the spread illumination device corresponding to the XX section in FIG.
  • FIG. 1 is an external perspective view of a spread illuminating device 1 according to an embodiment.
  • the longitudinal direction of the spread illumination device 1 is shown as the X-axis direction, the width direction as the Y-axis direction, and the thickness direction as the Z-axis direction, but the posture during use is arbitrary.
  • the spread illumination device 1 has a substantially rectangular (or substantially square) and substantially plate-like outer shape, and a box-like bottom frame with a floor (hidden behind in the figure) that accommodates a board, etc., which will be described later.
  • the housing consists of a top frame 9 that covers the opening side of the bottom frame.
  • a light emitting surface 1a (light emitting area) is formed in the top frame 9 by a substantially rectangular opening 9a, and light is emitted from the inside of the spread illuminating device 1 to the outside.
  • the internal optical sheet 8 is exposed on the output surface 1a. Details of the shape (unusual shape) of the opening 9a (output surface 1a) will be described later.
  • the spread illumination device 1 When the spread illumination device 1 is used as a backlight for an in-vehicle display such as a cluster meter, CID (Center Information Display), head-up display, or indicator, a liquid crystal display device or the like is mounted on the exit surface 1a side.
  • an in-vehicle display such as a cluster meter, CID (Center Information Display), head-up display, or indicator
  • a liquid crystal display device or the like is mounted on the exit surface 1a side.
  • FIG. 2 is an exploded perspective view of the main parts of the spread illumination device 1, and is a view seen from the output surface side similarly to FIG. 1.
  • the spread illumination device 1 includes a bottom frame 2, a substrate 3 on which a plurality of light sources 4 are arranged, a reflector 5, a condensing lens 6, and a light distribution/viewing range adjusting lens. 7 and an optical sheet 8 are attached, and the top frame 9 fits on the outside of the bottom frame 2 to cover it.
  • the bottom frame 2 has a bottom and four side walls provided around the outer periphery of the bottom.
  • the bottom frame 2 is formed of die casting, sheet metal, or the like.
  • a substrate 3 is fixed to the inside of the bottom of the bottom frame 2 via a fixing member (not shown) such as double-sided tape.
  • light sources 4 such as a plurality of LEDs (Light Emitting Diodes) are arranged, for example, in a grid pattern.
  • the plurality of light sources 4 can be driven by local dimming and are electrically connected so that they can be turned on individually. Further, by adjusting the emission intensity of each light source 4, brightness uniformity is further improved.
  • the back surface of the reflector 5 is fixed between the light sources 4 on the substrate 3 via fixing members (not shown) such as a plurality of strip-shaped double-sided tapes extending in the horizontal direction (or vertical direction) in the figure.
  • the reflector 5 has a reflective surface that surrounds each light source 4, and reflects the light emitted from the light source 4 over a wide angle toward the output surface to increase brightness.
  • the reflector 5 is manufactured by injection molding of synthetic resin or the like.
  • the condensing lens 6 arranged on the output side of the reflector 5 condenses the light incident from the light source 4 side into almost parallel light, and is, for example, a linear Fresnel lens with uneven grooves extending in the longitudinal direction (X-axis direction).
  • a lens is provided, for example, on the exit surface.
  • the linear Fresnel lens may be provided on the incident surface of the condenser lens 6.
  • a linear Fresnel lens has concave and convex grooves that correspond to the sloped part of the curved surface of one convex lens (cylindrical lens), and are lined up in the short direction (Y-axis direction), and are equal in number to the number of light sources 4 (lined up in the short direction). Provided periodically.
  • the light distribution/viewing range adjustment lens 7 disposed on the output side of the condenser lens 6 changes the optical axis of the output light at each part of the output surface within the YZ plane (optical axis tilt, peak shift), and This is to adjust the diffusion in the Y-axis direction at each part.
  • the light distribution/viewing range adjustment lens 7 includes a plurality (many) of minute prisms having uneven grooves extending in the X-axis direction on either the incident surface or the exit surface, and a plurality (many) of minute prisms having uneven grooves extending in the same direction. ) has a minute lenticular lens.
  • the prism and lenticular lens may be integrated as a compound lens.
  • the other surface has a plurality of minute lenticular grooves extending in the perpendicular Y-axis direction and adjusting the diffusion and brightness uniformity in the X-axis direction.
  • a lens may also be provided.
  • the optical sheet 8 disposed on the exit side of the light distribution/viewing range adjustment lens 7 is a diffusion sheet or a polarized light reflection sheet, but is not limited thereto, and may be a prism sheet or a louver sheet, for example.
  • the diffusion sheet diffuses the light that passes through it.
  • the polarization reflective sheet allows polarized light in a predetermined direction to pass therethrough and reflects polarized light in a direction perpendicular to the predetermined direction.
  • a top frame 9 is arranged on the exit surface side of the optical sheet 8, and the top frame 9 is fixed to the bottom frame 2.
  • the top frame 9 is made of resin, sheet metal, or the like.
  • planar illumination device 1 may have a curved shape.
  • FIG. 3 is a plan view of the reflector 5.
  • the reflector 5 is surrounded by a side wall 5a on the outside, and has a segment for each light source 4 on the inside. Each segment has a substantially rectangular opening 5b in which the light source 4 is exposed and arranged, and a plurality of reflective surfaces 5c, 5d, 5e, and 5f surrounding the opening 5b and tilted toward the exit surface.
  • the reflector 5 has an irregular shape that is convex outward from the center over substantially the entire length of the upper side. The reflective surface of the upper irregularly shaped portion whose planar shape is not rectangular is expanded toward the outer edge as an expanded portion 5g.
  • the expanded portion 5g is provided by making the opening of the irregularly shaped portion have the same shape as the opening 5b other than the irregularly shaped portion, and then tilting the reflective surface. That is, the plurality of openings 5b to which the light source 4 of the reflector 5 is exposed have the same shape and are arranged in a grid pattern, including the irregularly shaped portion, and the reflective surface on the outer edge side of the irregularly shaped portion corresponds to the shape of the outer edge of the irregularly shaped portion. It has been adjusted. In other words, in FIG.
  • the ridgeline formed by the reflective surfaces 5d and 5f extends linearly in one direction (Y direction), and the ridgeline formed by the reflective surfaces 5c and 5e extends in a direction perpendicular to the one direction (X direction). ), and only the ridgeline of the extended portion 5g extends non-linearly (the root valley line is straight).
  • the extended portion 5g may include two or more surfaces, and may include, for example, an inclined surface and a surface extending substantially parallel to the Z axis. At least a part of the irregularly shaped portion includes a surface extending substantially parallel to the Z-axis along the shape of the outer edge (for example, on the opening 9a side of the sloped surface), so that the slope angle of the reflective surface in the extended portion 5g can be adjusted over the entire length. It can be kept constant, and molding of the reflector 5 (manufacturing of a mold for molding the reflector 5) becomes easier.
  • a portion or multiple sides of the outer edge of the rectangular aperture may include an arcuate portion or a straight line portion non-parallel to the grid. It can also be applied when The irregularly shaped portion is not limited to a shape that is convex on the outside, but may be a shape that is concave on the inside. Furthermore, instead of making the opening of the irregularly shaped part have the same shape as the opening 5b other than the irregularly shaped part, for example, the opening of the irregularly shaped part may be enlarged and then the expanded portion 5g may be provided.
  • FIG. 4 is a diagram schematically showing the light emitting area of the spread illuminating device 1 and the light collecting position where the light source is arranged.
  • the outline indicated by a broken line indicates a light emitting area.
  • it has an unusual shape in which the center part of the upper side is convex outward.
  • a plurality of dot-dash lines extending in the horizontal direction (X-axis direction) in the figure are the light condensing positions (focal positions) of the linear Fresnel lens 6a, and the light source 4 is arranged at the light condensing positions.
  • the light condensing position (focal position) of the linear Fresnel lens 6a and the position of the light source 4 arranged in a straight line coincide, but also the case where the light condensing position and the position of the light source 4 are separated by some distance. may be parallel to each other.
  • the prisms of the linear Fresnel lens 6a are lined up in a plane perpendicular to the optical axis, such that the central axis of the linear Fresnel lens 6a (the linearly extending light condensing position of the linear Fresnel lens 6a) is aligned with the optical axis of the light source 4.
  • the light emitted from the linear Fresnel lens 6a can be tilted in the direction in which the prisms of the linear Fresnel lens 6a are lined up with respect to the optical axis of the light source 4.
  • FIG. 5 is a sectional view of the spread illumination device 1 corresponding to the XX section in FIG. ing.
  • the positions of the reflective surfaces 5c and 5e of the reflector 5 with respect to each light source 4 in each segment are almost the same, but in the irregularly shaped part on the right side, they are removed from the outer reflective surface.
  • the portion 5h is removed to form an expanded portion 5g.
  • the removed portion 5h that was obstructing the light from the light source 4 adjacent to the irregularly shaped part is removed, and the light reaches the end of the light emitting area, preventing the occurrence of dark areas in the irregularly shaped part and increasing the brightness. Uniformity is improved.
  • the linear Fresnel lens 6a of the condenser lens 6 located on the exit surface side of the extended portion 5g is an extended portion 6b in which the prism expands outward and continues. Therefore, the light collecting function is maintained even at the ends of the light emitting area, and brightness uniformity is further improved.
  • FIG. 6 is an enlarged view of the expanded portion 6b of the condenser lens 6, and the expanded portion 6b of the prism is expanded to correspond to the convex lens curved surface L of the cylindrical lens corresponding to the linear Fresnel lens 6a. That is, the other portions within the segment correspond to the partial curved surface L1 of the convex lens curved surface L, but the extended portion 6b corresponds to the partial curved surface L2 continuous to the partial curved surface L1. This allows the linear Fresnel lens 6a to condense light continuously even in irregularly shaped portions, preventing unevenness from occurring and further improving brightness uniformity.
  • FIG. 7 is a diagram illustrating an example in which a dark area DA occurs in the comparative example spread illumination device 1' due to the planar shape being an irregular shape that is not rectangular.
  • the area surrounded by the broken line is the light emitting area of the planar illumination device 1', and the upper side in the figure is an irregular shape whose planar shape is not rectangular.
  • each of the small squares indicates a segment, and in FIG. 7, a protruding portion due to an irregular shape is generated on the outside of the upper side of the segment arranged horizontally on the upper side.
  • FIG. 8 is a diagram showing another example in which a dark area DA occurs in the spread illumination device 1' of the comparative example due to the planar shape being an irregular shape that is not rectangular.
  • an irregularly shaped portion is included in the sequence of segments. In this case, it is difficult to place the light source along the light focusing position of the linear Fresnel lens in several segments (three in the illustrated example) at both ends due to structural constraints of the frame. Dark area DA will occur.
  • FIG. 9 is a diagram showing an example of the light emitting area and the light condensing position where the light source is arranged in the spread illuminating device 1' of the comparative example, and corresponds to the arrangement of the light emitting area and segments in FIG. 7.
  • a plurality of dashed dotted lines extending in the lateral direction (X-axis direction) in FIG. 9 are the light condensing positions (focal positions) of the linear Fresnel lens 6a', and the light source 4' is arranged at the light condensing positions.
  • FIG. 10 is a cross-sectional view of the spread illumination device 1' corresponding to the XX cross section in FIG. 9, and the bottom frame, light distribution/viewing range adjustment lens, optical sheet, and top frame are not shown.
  • a plurality of light sources 4' are arranged on a substrate 3', and a reflector 5' is arranged on the emission side thereof.
  • Each light source 4' is exposed through an opening 5b', and reflective surfaces 5c' and 5e' are continuous on both sides of the opening 5b'.
  • the removed portion 5h is removed from the outer reflective surface to form an expanded portion 5g. That is, because the planar shape of the light emitting area of the spread illumination device 1 is not rectangular but irregular, the light source 4 cannot be placed at the light converging position (of the virtually provided linear Fresnel lens) (due to lack of space or small space). In a portion, a segment of the reflector 5 adjacent to that portion is extended toward the outer edge of the spread illuminating device 1. Therefore, the light from the light source 4 reaches the end of the light emitting area, preventing dark areas from occurring in irregularly shaped parts and improving brightness uniformity.
  • the linear Fresnel lens 6a is provided with the prism expansion portion 6b corresponding to the portion of the expansion portion 5g expanded by the removed portion 5h of the reflector 5.
  • Light functionality is also maintained, and brightness uniformity in what would otherwise be dark areas is further improved.
  • the prism extension 6b is continuously provided along the curved surface of the cylindrical lens corresponding to the linear Fresnel lens 6a, the occurrence of unevenness is prevented and the brightness uniformity is further improved.
  • the expansion of the segments toward the outer edge and the expansion of the prism of the linear Fresnel lens 6a are perpendicular to the direction in which the grooves of the linear Fresnel lens 6a extend. It is carried out in the direction of Therefore, the effect of expanding the segment and the effect of expanding the prism of the linear Fresnel lens 6a are simultaneously realized.
  • linear Fresnel lens having an uneven groove extending in a direction perpendicular to the direction in which the uneven groove of the linear Fresnel lens 6a extends may be provided. This makes it possible to accommodate various light distributions.
  • the other linear Fresnel lenses mentioned above are formed on the opposite surface of the linear Fresnel lens 6a, or formed separately from the linear Fresnel lens 6a. This increases the degree of freedom in configuring both linear Fresnel lenses.
  • the spread illumination device is a direct type spread lighting device equipped with a linear Fresnel lens, and is arranged linearly on a substrate along the light condensing position of the linear Fresnel lens.
  • a reflector having a reflective surface surrounding each of the light sources to form a segment; In a portion where the light source cannot be placed along the position, the segment of the reflector adjacent to the portion is extended toward the outer edge of the spread illumination device. This prevents dark portions from occurring in irregularly shaped portions and improves brightness uniformity.
  • the prism of the linear Fresnel lens is expanded in a portion where the light source cannot be arranged along the light condensing position because the planar shape of the light emitting area of the planar illumination device is not rectangular but irregular. This maintains the light-gathering function of the linear Fresnel lens and further improves the uniformity of brightness in what would otherwise be dark areas.
  • the prism of the linear Fresnel lens is expanded in accordance with the curved surface of the cylindrical lens corresponding to the linear Fresnel lens. This allows the linear Fresnel lens to condense light continuously even at the irregularly shaped portion, preventing unevenness from occurring and further improving brightness uniformity.
  • the expansion of the segment toward the outer edge side and the expansion of the prism of the linear Fresnel lens are performed in a direction perpendicular to the direction in which the concave and convex grooves of the linear Fresnel lens extend.
  • linear Fresnel lens which has a concave and convex groove extending in a direction perpendicular to the direction in which the concave and convex grooves of the linear Fresnel lens extend. This makes it possible to accommodate various light distributions.
  • the other linear Fresnel lens is formed on the opposite surface of the linear Fresnel lens, or is formed separately from the linear Fresnel lens. This increases the degree of freedom in configuring both linear Fresnel lenses.
  • the plurality of apertures through which the light source of the reflector is exposed have the same shape and are arranged in a grid pattern, including the irregularly shaped portion, and the reflective surface on the outer edge side of the irregularly shaped portion has a shape of the outer edge of the irregularly shaped portion. has been adjusted accordingly. This facilitates the creation of a reflector mold (a mold for molding the reflector).
  • the direct type planar illumination device includes a linear Fresnel lens, and includes a plurality of light sources linearly arranged on a substrate along a light condensing position of the linear Fresnel lens, and a plurality of light sources surrounding each of the light sources. and a reflector having a reflective surface constituting a segment, in a part where the light source cannot be arranged along the light condensing position because the planar shape of the light emitting area of the planar illumination device is not rectangular.
  • the prism of the linear Fresnel lens is expanded in that part. This prevents dark portions from occurring in irregularly shaped portions and improves brightness uniformity.
  • the present invention is not limited to the above embodiments.
  • the present invention also includes configurations in which the above-mentioned components are appropriately combined. Moreover, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the embodiments described above, and various modifications are possible.
  • 1 Spread illumination device 1a emission surface, 2 bottom frame, 3 substrate, 4 light source, 5 reflector, 5a side wall, 5b opening, 5c to 5f reflective surface, 5g extension, 5h removal part, 6 condenser lens, 6a linear Fresnel lens, 6b extension part, 7 light distribution/viewing range adjustment lens, 8 optical sheet, 9 top frame, 9a aperture

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
PCT/JP2023/025062 2022-08-09 2023-07-06 面状照明装置 Ceased WO2024034296A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2023570459A JP7588737B2 (ja) 2022-08-09 2023-07-06 面状照明装置
CN202380058535.1A CN119677989A (zh) 2022-08-09 2023-07-06 面状照明装置
EP23852279.1A EP4571173A1 (en) 2022-08-09 2023-07-06 Planar illuminating device
US19/101,954 US20260049708A1 (en) 2022-08-09 2023-07-06 Planar illumination device
JP2024123776A JP7546185B1 (ja) 2022-08-09 2024-07-30 面状照明装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022127388 2022-08-09
JP2022-127388 2022-08-09

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WO2024034296A1 true WO2024034296A1 (ja) 2024-02-15

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US (1) US20260049708A1 (https=)
EP (1) EP4571173A1 (https=)
JP (2) JP7588737B2 (https=)
CN (1) CN119677989A (https=)
WO (1) WO2024034296A1 (https=)

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WO2025178118A1 (ja) * 2024-02-22 2025-08-28 ミネベアミツミ株式会社 面状照明装置

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JP2021190417A (ja) 2020-05-29 2021-12-13 日亜化学工業株式会社 面状光源、液晶表示装置
WO2022004036A1 (ja) 2020-07-01 2022-01-06 ミネベアミツミ株式会社 面状照明装置

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JP2011151218A (ja) * 2010-01-22 2011-08-04 Stanley Electric Co Ltd 発光装置
JP2021190417A (ja) 2020-05-29 2021-12-13 日亜化学工業株式会社 面状光源、液晶表示装置
WO2022004036A1 (ja) 2020-07-01 2022-01-06 ミネベアミツミ株式会社 面状照明装置

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WO2025178118A1 (ja) * 2024-02-22 2025-08-28 ミネベアミツミ株式会社 面状照明装置

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