JP5444539B2 - Internal illumination system - Google Patents

Internal illumination system Download PDF

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JP5444539B2
JP5444539B2 JP2009168539A JP2009168539A JP5444539B2 JP 5444539 B2 JP5444539 B2 JP 5444539B2 JP 2009168539 A JP2009168539 A JP 2009168539A JP 2009168539 A JP2009168539 A JP 2009168539A JP 5444539 B2 JP5444539 B2 JP 5444539B2
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light
emitting element
bottom plate
light emitting
housing
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JP2011023263A (en
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悠生 藤井
守 吉田
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Enplas Corp
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Enplas Corp
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Description

この発明は、筐体内部に設置した複数の点状発光素子モジュールから出射された光を、光拡散部材を介して均一に面発光させるようになっている内照式照明装置に関するものである。   The present invention relates to an internally illuminating device in which light emitted from a plurality of point-like light emitting element modules installed inside a casing is subjected to surface emission uniformly through a light diffusing member.

従来から、バックライトとして図１２に示すような内照式照明装置１００が知られている（特許文献１参照）。   Conventionally, an internally-illuminated illumination device 100 as shown in FIG. 12 is known as a backlight (see Patent Document 1).

この図１２に示す従来の内照式照明装置１００は、上部が開放された箱状の筐体１０１の内部に複数の棒状光源（蛍光ランプ）１０２を配置し、その筐体１０１の上部に光透過性を有する拡散板１０３を取り付けて、筐体１０１の上部の開口部分１０４をその拡散板１０３で塞いである。また、一般的に、このような従来の内照式照明装置１００は、拡散板１０３が大きく（例えば、縦・横の寸法が１ｍ×１．５ｍで、厚さが３ｍｍ）、拡散板１０３がその重さで撓み変形し易いため、筐体１０１の内部の底面１０５で且つ蛍光ランプ１０２，１０２間のスペースに、拡散板１０３を支えるリブ１０６を複数個立設するようになっている。そして、このような内照式照明装置１００は、拡散板１０３の外表面側に、広告画像や広告文字等がプリントされた被照明部材としての光透過性を有するフィルム又はプレート（図示せず）を配置して使用されるようになっている。なお、図１２（ａ）において、説明の便宜上、拡散板１０３を透明化して示している。   In the conventional internally-illuminated lighting device 100 shown in FIG. 12, a plurality of rod-shaped light sources (fluorescent lamps) 102 are arranged inside a box-shaped housing 101 whose upper portion is open, and light is emitted above the housing 101. A diffusing plate 103 having transparency is attached, and the opening 104 at the top of the housing 101 is closed with the diffusing plate 103. In general, such a conventional internally-illuminated lighting device 100 has a large diffusion plate 103 (for example, the vertical and horizontal dimensions are 1 m × 1.5 m and the thickness is 3 mm), and the diffusion plate 103 is Since it is easy to bend and deform due to its weight, a plurality of ribs 106 that support the diffusion plate 103 are provided upright on the bottom surface 105 inside the housing 101 and in the space between the fluorescent lamps 102 and 102. Such an internally-illuminated lighting device 100 is a light-transmitting film or plate (not shown) as an illuminated member having advertisement images, advertisement characters, etc. printed on the outer surface side of the diffusion plate 103. Is to be used. In FIG. 12A, the diffusion plate 103 is shown transparent for the convenience of explanation.

このような内照式照明装置１００は、複数の蛍光ランプ１０２からの光を拡散板１０３によって拡散させた状態で面状に出射し、その面状の出射光で被照明部材としてのフィルム又はプレートをその背面側から照明するようになっている。
しかしながら、図１２に示した従来の内照式照明装置１００を屋内外の広告パネルや案内パネル等のように大きなサイズの照明装置に適用する場合には、全体が大きく且つ重くなるため、取り扱いや運搬等を容易にし、支柱等の取付用部材の強度上の負担を軽減する観点から、軽量化を図る必要があった。このような要求を満たすために、拡散板１０３に代えて、単体では平面を維持できないような厚み（薄さ）の拡散シートを大型の内照式照明装置に使用する技術が知られている（特許文献２）。 Such an internally-illuminated illumination device 100 emits light from a plurality of fluorescent lamps 102 in a planar state in a state where the light is diffused by the diffusion plate 103, and a film or plate as a member to be illuminated with the planar emitted light. Is illuminated from the back side.
However, when the conventional internally-illuminated lighting device 100 shown in FIG. 12 is applied to a large-sized lighting device such as an indoor or outdoor advertising panel or a guide panel, the overall size becomes large and heavy. From the viewpoint of facilitating transportation and reducing the burden on the strength of mounting members such as support columns, it has been necessary to reduce the weight. In order to satisfy such a requirement, a technique is known in which a diffusion sheet having a thickness (thinness) that cannot be maintained as a single unit in place of the diffusion plate 103 is used for a large internal illumination device (see FIG. Patent Document 2).

また、発光面全面から完全拡散光を出射する蛍光ランプ１０２に代えて、長寿命で環境負荷の少ない光源として知られている発光ダイオードを用いることも知られている（特許文献３）。   In addition, it is also known to use a light emitting diode known as a light source with a long life and a low environmental load in place of the fluorescent lamp 102 that emits completely diffused light from the entire light emitting surface (Patent Document 3).

特開平５−１１９３１３号公報Japanese Patent Laid-Open No. 5-119313 特開２００５−４４７４７号公報JP 2005-44747 A 実用新案登録第３１４２４９９号公報Utility Model Registration No. 3142499

しかしながら、特許文献２に開示されているように、図１２に示した従来の内照式照明装置１００の拡散板１０３を拡散シートに代えて、張力を加えて筐体１０１の開口部分１０４を拡散シートで覆うようにした場合、内照式照明装置１００が大型化するほど、張力によって筐体１０１が変形しやすいという問題を有していた。   However, as disclosed in Patent Document 2, the diffusion plate 103 of the conventional internally-illuminated illumination device 100 shown in FIG. 12 is replaced with a diffusion sheet, and tension is applied to diffuse the opening 104 of the housing 101. When covered with a sheet, there is a problem that the casing 101 is easily deformed by tension as the internally illuminated lighting device 100 is increased in size.

これを解決するため、筐体１０１の対向する１対の側壁に補強リブを張り渡すことによって筐体１０１を補強することが考えられるが、蛍光ランプ１０２に代えて用いられる発光ダイオードからの出射光の一部が、この補強リブによって遮られることにより、内照式照明装置１００の発光面に部分的な暗部（出射光量の少ない部分）を生じさせ、照明品質を低下させるという問題を有していた。   In order to solve this problem, it is conceivable to reinforce the housing 101 by extending reinforcing ribs between a pair of opposing side walls of the housing 101. However, light emitted from a light emitting diode used in place of the fluorescent lamp 102 is considered. Is partially blocked by the reinforcing ribs, thereby causing a partial dark portion (a portion with a small amount of emitted light) on the light emitting surface of the internally illuminated lighting device 100, thereby reducing the illumination quality. It was.

本発明は、このような課題を解決し得る内照式照明装置の提供を目的とする。   An object of the present invention is to provide an internally-illuminated illumination device that can solve such problems.

請求項１の発明は、（１）平面形状が四角形の底板８とこの底板８から立ち上がる４側壁１０〜１３とによって形成され、前記４側壁１０〜１３の端縁１０ａから１３ａによって形作られる開口部分５を有する箱形形状の筐体２と、（２）前記筐体２の内部側で且つ前記底板８の内表面８ａに複数取り付けられて発光する点状発光素子モジュール７と、（３）前記筐体２の前記開口部分５に張力をかけられた状態で固定され、前記筐体２の前記開口部分５を塞ぐ光拡散性及び光透過性を有する拡散シート６と、（４）隣り合う前記点状発光素子モジュール７，７の間に位置し、前記４側壁１０〜１３のうちの対向する一対の側壁１０，１２の内壁面１０2ｂ，１２2ｂに張り渡されて前記筐体２の補強部材として機能する棒状のリブ１５と、を備えた内照式照明装置１に関するものである（図１乃至図８参照）。この発明において、前記点状発光素子モジュール７は、その発光中心７ａを含み且つ底板８の前記内表面８ａに直交する仮想平面内において、前記発光中心７ａを通り前記底板８の前記内表面８ａの法線方向へ延びる仮想軸を光束中心軸１７とすると、出射する光束のうちの最大強度光１８の進行方向が前記光束中心軸１７から所定角度（±θ）傾いた方向に位置するようになっている（図３及び図９参照）。また、前記リブ１５には、前記拡散シート６に反射された後に到達した光２１を拡散反射する光反射部材１６が前記対向する一対の側壁１０，１２のうちの一方から他方に至るまで取り付けられている（図２乃至図４参照）。そして、前記リブ１５及び前記光反射部材１６は、前記隣り合う点状発光素子モジュール７，７の前記最大強度光１８の進行方向よりも前記底板８側に配置されるようになっている（図３参照）。 The invention according to claim 1 is: (1) an opening formed by a bottom plate 8 having a square shape and four side walls 10 to 13 rising from the bottom plate 8 and formed by edges 10a to 13a of the four side walls 10 to 13; A box-shaped housing 2 having 5, (2) a point light-emitting element module 7 that is attached to the inner surface 8 a of the bottom plate 8 on the inner side of the housing 2 and emits light; A diffusion sheet 6 that is fixed in a state where tension is applied to the opening portion 5 of the housing 2 and has a light diffusion property and a light transmission property that closes the opening portion 5 of the housing 2; It is located between the point light emitting element modules 7 and 7 and is stretched over the inner wall surfaces 10 2 b and 12 2 b of the pair of opposing side walls 10 and 12 among the four side walls 10 to 13, and the housing 2. A rod-like rib 15 that functions as a reinforcing member of It relates internally illuminated lighting device 1 having (see FIGS. 1 to 8). In the present invention, the point light emitting element module 7 includes the light emission center 7a and passes through the light emission center 7a in a virtual plane perpendicular to the inner surface 8a of the bottom plate 8 to form the inner surface 8a of the bottom plate 8. If the imaginary axis extending in the normal direction is the light beam central axis 17, the traveling direction of the maximum intensity light 18 in the emitted light beam is positioned in a direction inclined by a predetermined angle (± θ) from the light beam central axis 17. (See FIGS. 3 and 9). A light reflecting member 16 that diffuses and reflects the light 21 that has arrived after being reflected by the diffusion sheet 6 is attached to the rib 15 from one of the pair of opposing side walls 10 and 12 to the other. (See FIGS. 2 to 4). And the said rib 15 and the said light reflection member 16 are arrange | positioned in the said baseplate 8 side rather than the advancing direction of the said maximum intensity light 18 of the said adjacent point light emitting element modules 7 and 7 (FIG. 3).

請求項２の発明は、請求項１の発明に係る内照式照明装置１における前記光反射部材１６に特徴を有するものである。すなわち、前記光反射部材１６は、前記隣り合う点状発光素子モジュール７，７の発光中心７ａ，７ａを含み且つ底板８に直交する仮想平面内において、前記隣り合う点状発光素子モジュール７，７の発光中心７ａ，７ａを前記底板８の前記内表面８ａに沿って結ぶ方向を左右方向とし、前記底板８の前記内表面８ａの法線方向を上方とすると、断面形状が左右対称形状であり、前記断面形状の中央部が上方へ向けて凸の滑らかな曲線形状であって、前記断面形状の前記中央部の両側が前記中央部とは逆凸形状の滑らかな曲線形状である、ことを特徴としている（図３及び図１１参照）。   The invention of claim 2 is characterized in that the light reflecting member 16 in the internal illumination device 1 according to the invention of claim 1 is characterized. That is, the light reflecting member 16 includes the light emitting centers 7a, 7a of the adjacent point light emitting element modules 7, 7, and the adjacent point light emitting element modules 7, 7 in a virtual plane orthogonal to the bottom plate 8. If the direction connecting the light emission centers 7a, 7a along the inner surface 8a of the bottom plate 8 is the left-right direction and the normal direction of the inner surface 8a of the bottom plate 8 is the upward direction, the cross-sectional shape is a symmetrical shape. The central portion of the cross-sectional shape is a convex curve that is convex upward, and both sides of the central portion of the cross-sectional shape are smooth curved shapes that are convex opposite to the central portion. It is a feature (see FIGS. 3 and 11).

本発明に係る内照式照明装置は、従来の拡散板に代えて拡散シートを使用しているため、全体の重量を従来例よりも軽量化することができる。   Since the internal illumination type illumination device according to the present invention uses a diffusion sheet instead of the conventional diffusion plate, the overall weight can be reduced as compared with the conventional example.

また、本発明に係る内照式照明装置は、従来の蛍光ランプに代えて点状発光素子モジュールを光源として使用するため、光源の寿命を従来例よりも長寿命化することができ、光源の交換等のメンテナンス作業を少なくすることができる。   Moreover, since the internal illumination type illumination device according to the present invention uses a point light emitting element module as a light source instead of a conventional fluorescent lamp, the life of the light source can be longer than that of the conventional example. Maintenance work such as replacement can be reduced.

また、本発明に係る内照式照明装置は、リブ及び光反射部材が隣り合う点状発光素子モジュールからの最大強度光を遮ることがなく、光反射部材が拡散シートによって反射された光を拡散反射して拡散シート側に戻すことができるため、拡散シートからの出射光に部分的な暗部が生じるのを抑えることができ、高品質の照明が可能になる。   Moreover, the internal illumination type illumination device according to the present invention does not block the maximum intensity light from the adjacent point-like light emitting element module, and the light reflecting member diffuses the light reflected by the diffusion sheet. Since it can reflect and return to the diffusion sheet side, it can suppress that a dark part arises in the emitted light from a diffusion sheet, and high quality illumination is attained.

本発明の実施の形態に係る内照式照明装置の外観斜視図である。It is an external appearance perspective view of the internal illumination type illuminating device which concerns on embodiment of this invention. 図１における内照式照明装置の拡散シートを取り除いて示す平面図である。It is a top view which removes and shows the diffusion sheet of the internal illumination type illuminating device in FIG. 図２のＡ１−Ａ１線に沿って切断して示す拡大断面図である。FIG. 3 is an enlarged cross-sectional view cut along the line A1-A1 in FIG. 2. 図３に示したリブ及び光反射部材を示す外観斜視図である。It is an external appearance perspective view which shows the rib and light reflection member which were shown in FIG. 図２に示した内照式照明装置の第１筐体部分の平面図である。It is a top view of the 1st housing | casing part of the internal illumination type illuminating device shown in FIG. 図５のＡ２−Ａ２線に沿って切断して示す第１筐体部分の断面図である。It is sectional drawing of the 1st housing | casing part shown cut along the A2-A2 line | wire of FIG. 図２に示した内照式照明装置の第２筐体部分の平面図である。It is a top view of the 2nd housing | casing part of the internal illumination type illuminating device shown in FIG. 図７のＡ３−Ａ３線に沿って切断して示す第２筐体部分の断面図である。It is sectional drawing of the 2nd housing | casing part shown cut along the A3-A3 line | wire of FIG. 点状発光素子モジュールの出射光特性を示す図である。It is a figure which shows the emitted light characteristic of a point light emitting element module. 本発明の実施の形態に係る内照式照明装置の比較例を示す図である。It is a figure which shows the comparative example of the internal illumination type illuminating device which concerns on embodiment of this invention. 本発明の実施の形態に係る内照式照明装置の効果を説明するための図であり、図３に対応する図である。It is a figure for demonstrating the effect of the internal illumination type illuminating device which concerns on embodiment of this invention, and is a figure corresponding to FIG. 従来の内照式照明装置を示す図である。このうち、図１２（ａ）が内照式照明装置の平面図であり、図１２（ｂ）が図１２（ａ）のＢ−Ｂ線に沿って切断して示す断面図である。It is a figure which shows the conventional internal illumination type illuminating device. 12A is a plan view of the internally-illuminated illumination device, and FIG. 12B is a cross-sectional view taken along line BB in FIG. 12A.

以下、本発明の実施の形態を図面に基づき詳述する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１乃至図８は、本発明の実施の形態に係る内照式照明装置１を示すものである。このうち、図１は内照式照明装置１の外観斜視図である。図２は、内照式照明装置１の拡散シート６を取り除いて示す平面図である。図３は、図２のＡ１−Ａ１線に沿って切断して示す拡大断面図である。図４は、図３に示したリブ及び光反射部材を示す外観斜視図である。図５は、図２に示した内照式照明装置１の第１筐体部分３の平面図である。図６は、図５のＡ２−Ａ２線に沿って切断して示す第１筐体部分３の断面図である。図７は、図２に示した内照式照明装置１の第２筐体部分４の平面図である。図８は、図７のＡ３−Ａ３線に沿って切断して示す第２筐体部分４の断面図である。   1 to 8 show an internal illumination device 1 according to an embodiment of the present invention. Among these, FIG. 1 is an external perspective view of the internally illuminated illumination device 1. FIG. 2 is a plan view in which the diffusion sheet 6 of the internally illuminated lighting device 1 is removed. 3 is an enlarged cross-sectional view taken along the line A1-A1 of FIG. FIG. 4 is an external perspective view showing the rib and the light reflecting member shown in FIG. FIG. 5 is a plan view of the first housing portion 3 of the internally illuminated lighting device 1 shown in FIG. 6 is a cross-sectional view of the first housing portion 3 shown cut along the line A2-A2 of FIG. FIG. 7 is a plan view of the second housing portion 4 of the internally illuminated lighting device 1 shown in FIG. FIG. 8 is a cross-sectional view of the second housing portion 4 cut along the line A3-A3 in FIG.

図１及び図２に示すように、内照式照明装置１は、箱形形状の筐体２の開口部分５に拡散シート６を固定し、筐体２の内部に複数配置した点状発光素子モジュール７から出射した光を拡散シート６の背面側（筐体２の内部側）から照射し、拡散シート６の外表面にプリントされた模様や文字等を拡散シート６の外表面側から視認できるようになっている。   As shown in FIGS. 1 and 2, the internally illuminating device 1 includes a point light emitting element in which a diffusion sheet 6 is fixed to an opening 5 of a box-shaped housing 2 and a plurality of light emitting elements are arranged inside the housing 2. Light emitted from the module 7 is irradiated from the back side of the diffusion sheet 6 (inside the housing 2), and a pattern, characters, or the like printed on the outer surface of the diffusion sheet 6 can be viewed from the outer surface side of the diffusion sheet 6. It is like that.

図１及び図２に示すように、筐体２は、平面形状が長方形の底板８とこの底板８から立ち上がる４側壁１０〜１３とによって形成され、４側壁１０〜１３の端縁１０ａ〜１３ａによって形作られる開口部分５を有している。この箱形形状の筐体２は、金属板（例えば、アルミニウム板、又はステンレス板）で形成され、底板８を含む第１筐体部分３と、この第１筐体部分３上に積み重ねるように位置する第２筐体部分４とに２分割されている（図５乃至図８参照）。そして、第１筐体部分３の４側壁１０1〜１３1の外表面１０1ａ〜１３1ａと第２筐体部分４の４側壁１０2〜１３2の外表面１０2ａ〜１３2ａには、第１筐体部分３と第２筐体部分４とを脱着可能に固定する複数の固定具（ヒンジやフック等）１４が第１筐体部分３と第２筐体部分４に跨って取り付けられている。このように、筐体２を第１筐体部分３と第２筐体部分４とに分割し、且つ、第１筐体部分３と第２筐体部分４とを脱着可能に固定することにより、内部に取り付けられる部品等に対するメンテナンス作業（例えば、部品の交換、清掃等）が容易化する。 As shown in FIGS. 1 and 2, the housing 2 is formed by a bottom plate 8 having a rectangular planar shape and four side walls 10 to 13 rising from the bottom plate 8, and by edges 10 a to 13 a of the four side walls 10 to 13. It has an opening 5 that is shaped. The box-shaped housing 2 is formed of a metal plate (for example, an aluminum plate or a stainless steel plate), and is stacked on the first housing portion 3 including the bottom plate 8 and the first housing portion 3. It is divided into two parts, the second housing part 4 (see FIGS. 5 to 8). The fourth sidewall 10 1-13 1 of outer surface 10 1 A～13 1 a and 4 side walls 10 2-13 2 of the outer surface of the second housing part 4 10 2 A～13 2 of the first housing part 3 a includes a plurality of fasteners (such as hinges and hooks) 14 detachably fixing the first housing part 3 and the second housing part 4 to the first housing part 3 and the second housing part 4. Attached across. As described above, by dividing the housing 2 into the first housing portion 3 and the second housing portion 4 and fixing the first housing portion 3 and the second housing portion 4 so as to be detachable. Maintenance work (for example, replacement of parts, cleaning, etc.) for parts mounted inside is facilitated.

図２，図３，図５及び図６に示すように、第１筐体部分３の底板８の内表面８ａには、点状発光素子モジュール７がマトリックス状に複数（２行６列の合計１２個）取り付けられている。なお、点状発光素子モジュール７は、点状発光素子としてＬＥＤを使用し、そのＬＥＤをプラスチック又はガラスのレンズで覆ったＬＥＤモジュールである。   As shown in FIGS. 2, 3, 5, and 6, the inner surface 8 a of the bottom plate 8 of the first housing portion 3 has a plurality of dot-like light emitting element modules 7 in a matrix (total of 2 rows and 6 columns). 12) are attached. The point light emitting element module 7 is an LED module in which an LED is used as the point light emitting element and the LED is covered with a plastic or glass lens.

図２，図７及び図８に示すように、第２筐体部分４の長辺側の対向する一対の側壁１０2，１２2には、棒状のリブ１５が複数本（本実施形態においては２本）平行に固定されている（張り渡されてされている）。このリブ１５は、筐体２（特に、第２筐体部分４）の補強部材として機能するものであり、その長手方向端部が側壁１０2，１２2の内壁面１０2ｂ，１２2ｂに垂直に固定（例えば、接着固定）され、第２筐体部分４の短辺側の対向する一対の側壁１１2，１３2と平行に位置している。そして、図２に示すように、リブ１５は、第１筐体部分３に対して第２筐体部分４を積み重ねるように組み合わせた状態において、２列目の点状発光素子モジュール７と３列目の点状発光素子モジュール７の中間と、４列目の点状発光素子モジュール７と５列目の点状発光素子モジュール７の中間とに、それぞれに位置するように配置されている。ここで、本実施形態のリブ１５は、金属製の角棒が使用されているが、これに限られるものではなく、断面形状が円形，楕円形，三角形又は六角形等の金属棒を使用してもよい。なお、第２筐体部分４の対向する一対の側壁１０2，１２2にリブ１５，１５を固定せずに、第２筐体部分４を何ら補強しない場合には、拡散シート６の張力によって長辺側の一対の側壁１０2，１２2が内側に湾曲変形すると共に、短辺側の一対の側壁１１2，１３2が外側に湾曲変形し、外観品質を損ねるのみならず、第１筐体部分３と第２筐体部分４との突き合わせ部に隙間が生じ、光漏れが生じたり、外部の埃が筐体２の内部に浸入し易くなるという不具合を生じる。しかし、本実施形態の内照式照明装置１は、上述したように、第２筐体部分４を一対のリブ１５，１５によって補強しているため、第２筐体部分４をリブ１５によって補強しない場合に生じる上述のような不具合が生じることはない。 As shown in FIGS. 2, 7 and 8, a plurality of rod-like ribs 15 (in the present embodiment) are provided on the pair of opposing side walls 10 2 , 12 2 on the long side of the second housing portion 4. 2) Fixed in parallel (stretched). The rib 15 includes a housing 2 (in particular, the second housing part 4) functions as a reinforcing member, the longitudinal end side wall 10 2, 12 2 of the inner wall surface 10 2 b, 12 2 b The second housing part 4 is fixed in parallel (for example, adhesively fixed) and is positioned in parallel with the pair of opposing side walls 11 2 and 13 2 on the short side. As shown in FIG. 2, the ribs 15 are combined with the second row of point light emitting element modules 7 and the third row in a state where the second housing portion 4 is stacked on the first housing portion 3. It is arranged so as to be located in the middle of the point light emitting element module 7 of the eye and in the middle of the point light emitting element module 7 in the fourth row and the point light emitting element module 7 in the fifth row. Here, although the metal square bar is used for the rib 15 of this embodiment, it is not restricted to this, The cross-sectional shape uses metal bars, such as circular, an ellipse, a triangle, or a hexagon. May be. When the ribs 15 and 15 are not fixed to the pair of opposing side walls 10 2 and 12 2 of the second casing part 4 and the second casing part 4 is not reinforced at all, the tension of the diffusion sheet 6 causes The pair of side walls 10 2 , 12 2 on the long side is curved and deformed inward, and the pair of side walls 11 2 , 13 2 on the short side is curved and deformed outward, not only deteriorating the appearance quality but also the first housing. A gap is generated at the abutting portion between the body part 3 and the second housing part 4, thereby causing a problem that light leaks or external dust easily enters the inside of the housing 2. However, as described above, the internally illuminated lighting device 1 of the present embodiment reinforces the second housing portion 4 with the pair of ribs 15 and 15, and thus reinforces the second housing portion 4 with the ribs 15. The above-mentioned problems that occur when not being performed do not occur.

また、図２乃至図４に示すように、リブ１５には、光を拡散反射する光反射部材１６が固定されている。この光反射部材１６は、薄板状のＰＥＴ（例えば、超微細発泡光反射板（登録商標：ＭＣＰＥＴ）古川電工製）を加熱・加圧して成形したものであり、中央部が上方に向けて凸形状の滑らかな曲面（上凸曲面１６ａ）で形成され（特に、図３及び図４参照）、中央部の両側が中央部とは逆凸形状の滑らかな曲面（下凸曲面１６ｂ，１６ｂ）で形成されており（特に、図３及び図４参照）、リブ１５の上面１５ａの長手方向一端から他端まで図示しない両面テープ若しくは接着剤またはリブ１５と光反射部材１６に穴開加工をしてネジ等の別部材を用いて固定されている。ここで、図３に示す光反射部材１６の上凸曲面１６ａ及び下凸曲面１６ｂ，１６ｂの形状は、拡散シート６のうちの暗部が生じやすい部分（楕円２２で囲った範囲）に向けて多くの光が拡散反射するように形成されている（図１１参照）。しかも、図３に示すように、光反射部材１６は、隣り合う点状発光素子モジュール７，７の発光中心７ａ，７ａを含み且つ底板８の内表面８ａに直交する仮想平面内において、隣り合う点状発光素子モジュール７，７の発光中心７ａ，７ａを底板８の内表面８ａに沿って結ぶ方向を左右方向とし、底板８の内表面８ａの法線方向を上方とすると、断面形状の中央部が上方へ向けて凸の滑らかな曲線形状であって、断面形状の中央部の両側が中央部とは逆凸（下凸）形状の滑らかな曲線形状であり、全体の断面形状が中心線ＣＬに対して左右対称形状となるように形成されている。   As shown in FIGS. 2 to 4, a light reflecting member 16 that diffuses and reflects light is fixed to the rib 15. The light reflecting member 16 is formed by heating and pressing a thin plate-like PET (for example, an ultrafine foamed light reflecting plate (registered trademark: MCPET), manufactured by Furukawa Electric), and the center portion is convex upward. It is formed with a smooth curved surface (upward convex curved surface 16a) (refer to FIGS. 3 and 4 in particular), and both sides of the central portion are smooth curved surfaces (down convex curved surfaces 16b, 16b) having a convex shape opposite to the central portion. (Refer to FIG. 3 and FIG. 4 in particular), and a hole is formed in the rib 15 and the light reflecting member 16 from the longitudinal end of the upper surface 15a of the rib 15 to the other end of the double-sided tape or adhesive (not shown). It is fixed using another member such as a screw. Here, the shapes of the upper convex curved surface 16a and the lower convex curved surfaces 16b and 16b of the light reflecting member 16 shown in FIG. 3 are many toward the portion of the diffusion sheet 6 where dark portions are likely to occur (range surrounded by the ellipse 22). Is diffusely reflected (see FIG. 11). Moreover, as shown in FIG. 3, the light reflecting members 16 are adjacent to each other in a virtual plane including the light emission centers 7 a and 7 a of the adjacent point light emitting element modules 7 and 7 and orthogonal to the inner surface 8 a of the bottom plate 8. When the direction connecting the light emission centers 7a, 7a of the point light emitting element modules 7, 7 along the inner surface 8a of the bottom plate 8 is the left-right direction and the normal direction of the inner surface 8a of the bottom plate 8 is the upper direction, The part has a smooth curved shape that is convex upward, and both sides of the central part of the cross-sectional shape are smooth curved shapes that are reverse convex (down convex) to the central part, and the overall cross-sectional shape is the center line It is formed so as to be symmetrical with respect to CL.

図９は、点状発光素子モジュール７の発光特性を示すものである。この図９に示すように、本実施形態において使用される点状発光素子モジュール７は、発光中心７ａを含み且つ底板８の内表面８ａに直交する仮想平面内において（図３参照）、発光中心７ａを通り且つ取付基準面（底板８の内表面８ａ）の法線方向へ延びる仮想軸を光束中心軸１７とすると、出射する光束のうちの最大強度光（相対照度の最も大きな光）１８の進行方向が光束中心軸１７から所定角度θ（±６０°）傾いた方向に位置するようになっている（図３参照）。また、点状発光素子モジュール７は、図９に示すように、光束中心軸１７上において相対照度が５０％となり、光束中心軸１７を中心としてほぼ左右対称の断面形状となる光束を出射するようになっている。また、図９に示す点状発光素子モジュール７は、光束中心軸１７から最大強度光１８が進行する方向までの所定角度θ（±６０°）の範囲の出射光量が全体の約７０％になるように構成されている（図３参照）。なお、相対照度とは、最高照度値を１００（％）とし、光源配光角度（光束中心軸１７からの傾斜角度）毎の照度値を最高照度値に対する割合で表した数値（％）をいう。この照度値は、点状発光素子モジュール７の発光中心７ａから所定距離離れた位置に照度計を配置し、光源配光角度毎に照度計の受光部を発光中心７ａに向けて測定される。また、点状発光素子モジュール７の光束中心軸１７から最大強度光１８の進行方向までの所定角度θは、点状発光素子モジュール７の発光特性に応じて異なる数値となる。   FIG. 9 shows the light emission characteristics of the point light emitting element module 7. As shown in FIG. 9, the point light emitting element module 7 used in this embodiment includes a light emission center 7a and a light emission center in a virtual plane perpendicular to the inner surface 8a of the bottom plate 8 (see FIG. 3). If a virtual axis passing through 7a and extending in the normal direction of the mounting reference surface (inner surface 8a of the bottom plate 8) is a light beam central axis 17, the maximum intensity light (light having the largest relative illuminance) 18 of the emitted light beam The traveling direction is positioned in a direction inclined by a predetermined angle θ (± 60 °) from the light beam central axis 17 (see FIG. 3). Further, as shown in FIG. 9, the point light emitting element module 7 emits a light beam having a relative illuminance of 50% on the light beam central axis 17 and a substantially symmetrical cross-sectional shape around the light beam central axis 17. It has become. Further, in the point light emitting element module 7 shown in FIG. 9, the amount of emitted light in the range of a predetermined angle θ (± 60 °) from the light beam central axis 17 to the direction in which the maximum intensity light 18 travels is about 70% of the whole. (See FIG. 3). The relative illuminance is a numerical value (%) in which the maximum illuminance value is 100 (%) and the illuminance value for each light source light distribution angle (inclination angle from the light beam central axis 17) is expressed as a ratio to the maximum illuminance value. . The illuminance value is measured by placing an illuminance meter at a predetermined distance from the light emission center 7a of the point light emitting element module 7 and with the light receiving portion of the illuminance meter facing the light emission center 7a for each light source light distribution angle. In addition, the predetermined angle θ from the light flux central axis 17 of the point light emitting element module 7 to the traveling direction of the maximum intensity light 18 is a different value depending on the light emission characteristics of the point light emitting element module 7.

このような点状発光素子モジュール７の発光特性を考慮し、図２及び図３に示すように、リブ１５と光反射部材１６が筐体２内に配置されている。すなわち、第１行目の第２列目と第３列目の隣り合う点状発光素子モジュール７，７同士の発光中心７ａ，７ａを含み、且つ、底板８の内表面８ａに直交する仮想平面内において、リブ１５及び光反射部材１６は、点状発光素子モジュール７の最大強度光１８が拡散シート６へ向かう光路よりも底板８側に位置するように配置されている（図２及び図３参照）。また、第１行目の第４列目と第５列目の隣り合う点状発光素子モジュール７，７同士の発光中心７ａ，７ａを含み、且つ、底板８の内表面８ａに直交する仮想平面内において、リブ１５及び反射部材１６は、点状発光素子モジュール７の最大強度光１８が拡散シート６へ向かう光路よりも底板８側に位置し、最大強度光１８を遮ることがないように配置されている（図２及び図３参照）。   Considering the light emission characteristics of the point light emitting element module 7 as described above, as shown in FIGS. 2 and 3, the rib 15 and the light reflecting member 16 are disposed in the housing 2. That is, a virtual plane that includes the light emission centers 7 a and 7 a of the adjacent point light emitting element modules 7 and 7 in the first and second rows of the first row and is orthogonal to the inner surface 8 a of the bottom plate 8. Inside, the rib 15 and the light reflecting member 16 are disposed so that the maximum intensity light 18 of the point light emitting element module 7 is located on the bottom plate 8 side with respect to the optical path toward the diffusion sheet 6 (FIGS. 2 and 3). reference). In addition, a virtual plane that includes the light emission centers 7 a and 7 a of the adjacent point light emitting element modules 7 and 7 in the first row in the first row and that is orthogonal to the inner surface 8 a of the bottom plate 8. Inside, the rib 15 and the reflecting member 16 are arranged so that the maximum intensity light 18 of the point light emitting element module 7 is located on the bottom plate 8 side of the optical path toward the diffusion sheet 6 and does not block the maximum intensity light 18. (See FIGS. 2 and 3).

そして、図２及び図３に示すように、このような点状発光素子モジュール７の最大強度光１８の光路とリブ１５及び光反射部材１６との関係状態は、リブ１５の断面積及びリブ１５の底板８からの高さ寸法ｈ１を考慮して設定されており、第１行目の第２列目と第３列目の点状発光素子モジュール７，７同士のピッチＰ２、及び第１行目の第４列目と第５列目の点状発光素子モジュール同士７，７のピッチＰ２を、第１行目の第１列目と第２列目の点状発光素子モジュール７，７同士のピッチＰ１、第１行目の第３列目と第４列目の点状発光素子モジュール７，７同士のピッチＰ１、及び第１行目の第５列目と第６列目の点状発光素子モジュール７，７同士のピッチＰ１よりも大きく（Ｐ２＞Ｐ１）することにより、リブ１５が点状発光素子モジュール７からの光を極力遮らないようになっている（図５及び図６参照）。   As shown in FIGS. 2 and 3, the relationship between the optical path of the maximum intensity light 18 of the point light emitting element module 7, the rib 15, and the light reflecting member 16 is the sectional area of the rib 15 and the rib 15. Is set in consideration of the height dimension h1 from the bottom plate 8, the pitch P2 between the point-like light emitting element modules 7 and 7 in the second and third columns of the first row, and the first row. The pitch P2 between the point light emitting element modules 7 and 7 in the fourth column and the fifth column of the eye is set to the pitch P2 between the point light emitting element modules 7 and 7 in the first column and the second column in the first row. P1, the pitch P1 between the point-like light emitting element modules 7, 7 in the third and fourth columns in the first row, and the points in the fifth and sixth columns in the first row. By making the pitch P1 larger than the pitch P1 between the light emitting element modules 7 and 7 (P2> P1), the rib 15 is a point light emitting element. So as not minimize block light from Joules 7 (see FIGS. 5 and 6).

また、図１及び図２に示すように、第２筐体部分４の４側壁１０2〜１３2のうちの上側の端縁１０ａ〜１３ａ（第１筐体部分３の４側壁１０1〜１３1に突き当てられる側の端縁を下側の端縁とした場合、この下側の端縁に対して反対側に位置する端縁）によって囲まれる開口部分５には、拡散シート６を固定してある（図７及び図８参照）。拡散シート６は、光拡散性及び光透過性を有する長方形で且つ薄膜状のプラスチックシート（例えば、サインシート（製品名：ＦＦシート）リンテックサインシステム製、又は塩化ビニールであって、厚さ１ｍｍ以下のもの）によって形成されており、第２筐体部分４の４側壁１０2〜１３2のうちの上側の端縁１０ａ〜１３ａ近傍に取り付けられたシート固定具１９1〜１９4によって張力をかけられた状態で固定され、開口部分５を塞いでいる。なお、リブ１５の上面１５ａから拡散シート６の内表面までの寸法ｈ２は、複数の点状発光素子モジュール７からの光が拡散シート６の内表面で均一に混ざり合う寸法に設定されている。 Further, as shown in FIGS. 1 and 2, the upper edge 10a~13a of the four side walls 10 2-13 2 of the second housing portion 4 (4 sidewalls 10 of the first housing part 3 to 13 1 is a lower edge, the diffusion sheet 6 is fixed to the opening 5 surrounded by the edge located on the opposite side of the lower edge). (See FIGS. 7 and 8). The diffusion sheet 6 is a rectangular and thin plastic sheet (for example, a sign sheet (product name: FF sheet) manufactured by Lintec Sign System, or vinyl chloride having a light diffusing property and a light transmitting property, and has a thickness of 1 mm or less. And is tensioned by sheet fixtures 19 1 to 19 4 attached in the vicinity of the upper edges 10a to 13a of the four side walls 10 2 to 13 2 of the second housing part 4 It is fixed in a closed state and closes the opening 5. The dimension h2 from the upper surface 15a of the rib 15 to the inner surface of the diffusion sheet 6 is set to a dimension in which light from the plurality of point light emitting element modules 7 is uniformly mixed on the inner surface of the diffusion sheet 6.

以上のように、複数の点状発光素子モジュール７が取り付けられた第１筐体部分３に対して、リブ１５及び光反射部材１６が固定されると共に拡散シート６が固定された第２筐体部分４を積み重ねるように組付け、第１筐体部分３と第２筐体部分４とを複数の固定具１４によって固定すると、図１に示したような内照式照明装置１が完成する。   As described above, the second casing in which the rib 15 and the light reflecting member 16 are fixed and the diffusion sheet 6 is fixed to the first casing portion 3 to which the plurality of point light emitting element modules 7 are attached. When the parts 4 are assembled so as to be stacked and the first housing part 3 and the second housing part 4 are fixed by a plurality of fixtures 14, the internally illuminated lighting device 1 as shown in FIG. 1 is completed.

このように構成された本実施形態の内照式照明装置１は、リブ１５及び光反射部材１６を挟んで隣り合う点状発光素子モジュール７，７の最大強度光１８がリブ１５及び光反射部材１６に直接照射されないため、点状発光素子モジュール７から出射した光の多くがリブ１５及び光反射部材１６によって遮られることなく拡散シート６に直接到達する（図３及び図９参照）。ここで、図１０に示す比較例の内照式照明装置３０のように、リブ１５が隣り合う点状発光素子モジュール７，７の最大強度光１８を遮るように位置していると、点状発光素子モジュール７の最大強度光１８の進行方向を延長した仮想線１８’と拡散シート６との交差部分に暗部（影ムラ）３１が生じ、照明品質の低下を招くことになる。しかしながら、上述したように、本実施形態の内照式照明装置１は、点状発光素子モジュール７からの最大強度光１８がリブ１５及び光反射部材１６によって遮られることがないため、比較例のような不具合を生じることがない。   In the internally illuminated illumination device 1 of the present embodiment configured as described above, the maximum intensity light 18 of the point-like light emitting element modules 7 and 7 that are adjacent to each other with the rib 15 and the light reflecting member 16 in between is the rib 15 and the light reflecting member. 16 is not directly irradiated, most of the light emitted from the point light emitting element module 7 directly reaches the diffusion sheet 6 without being blocked by the rib 15 and the light reflecting member 16 (see FIGS. 3 and 9). Here, when the rib 15 is positioned so as to block the maximum intensity light 18 of the adjacent point light emitting element modules 7 and 7 as in the comparative illumination device 30 of the comparative example shown in FIG. A dark part (shadow unevenness) 31 is generated at the intersection between the imaginary line 18 ′ in which the traveling direction of the maximum intensity light 18 of the light emitting element module 7 extends and the diffusion sheet 6, and the illumination quality is deteriorated. However, as described above, the internally illuminated illumination device 1 according to the present embodiment has the maximum intensity light 18 from the point light emitting element module 7 not blocked by the ribs 15 and the light reflecting member 16. Such a problem does not occur.

また、図１１に示すように、本実施形態の内照式照明装置１は、拡散シート６に到達した光２０のうちで、拡散シート６への入射角度が大きいために拡散シート６表面で反射された光を光反射部材１６の上面（拡散シート６側）で拡散反射させて拡散シート６へ戻すことによって、点状発光素子モジュール７のピッチが広い（Ｐ２＞Ｐ１）ことが起因となって暗部が生じやすいリブ１５の直上及びその近傍（楕円２２で囲った範囲）側に多く戻すことができるようになっている。   Further, as shown in FIG. 11, the internally illuminated lighting device 1 of the present embodiment reflects on the surface of the diffusion sheet 6 because the incident angle to the diffusion sheet 6 is large among the light 20 that has reached the diffusion sheet 6. The diffused light is diffusely reflected on the upper surface (the diffusion sheet 6 side) of the light reflecting member 16 and returned to the diffusion sheet 6, thereby causing the pitch of the point light emitting element modules 7 to be wide (P2> P1). A large amount can be returned directly above and near the rib 15 (range enclosed by the ellipse 22).

以上のように、本実施形態の内照式照明装置１によれば、リブ１５及び光反射部材１６が隣り合う点状発光素子モジュール７，７からの最大強度光１８を遮ることがなく、光反射部材１６が拡散シート６によって反射された光を拡散シート６側に向けて（リブ１５の直上及びその近傍側に多く）拡散反射することにより、拡散シート６からの出射光に部分的な暗部が生じるのを抑えることができ、高品質の照明が可能になる。   As described above, according to the internally illuminated lighting device 1 of the present embodiment, the rib 15 and the light reflecting member 16 do not block the maximum intensity light 18 from the adjacent point light emitting element modules 7 and 7, and light The reflection member 16 diffuses and reflects the light reflected by the diffusion sheet 6 toward the diffusion sheet 6 (many directly above and near the ribs 15), thereby partially darkening the light emitted from the diffusion sheet 6. Can be suppressed, and high-quality lighting can be achieved.

また、本実施形態の内照式照明装置１によれば、従来の拡散板に代えて拡散シート６を使用しているため、全体の重量を軽減することができる。   Moreover, according to the internal illumination type illuminating device 1 of this embodiment, since the diffusion sheet 6 is used instead of the conventional diffusion plate, the overall weight can be reduced.

また、本実施形態の内照式照明装置１によれば、従来の蛍光ランプに代えて点状発光素子モジュール７を光源として使用するため、光源の寿命を従来例よりも長寿命化することができ、光源の交換等のメンテナンス作業を少なくすることができる。   Moreover, according to the internal illumination type illuminating device 1 of this embodiment, since the point light emitting element module 7 is used as a light source instead of the conventional fluorescent lamp, the lifetime of the light source can be made longer than that of the conventional example. Thus, maintenance work such as replacement of the light source can be reduced.

なお、本発明は、上述の実施形態に限られず、リブ１５及び光反射部材１６を可能な限り底板８側に近づけて配置し、点状発光素子モジュール７から出射した光のうちで拡散シート６に直接到達する光（リブ１５及び光反射部材１６に直接照射されない光）の量を多くすることが好ましい。   Note that the present invention is not limited to the above-described embodiment, and the rib 15 and the light reflecting member 16 are disposed as close to the bottom plate 8 as possible, and the diffusion sheet 6 out of the light emitted from the point light emitting element module 7. It is preferable to increase the amount of light that directly reaches the light (light that is not directly irradiated to the ribs 15 and the light reflecting member 16).

また、上述の実施形態に係る内照式照明装置１は、点状発光素子モジュール７を底板８の内表面８ａ上に２行６列の合計１２個だけ配置する態様を例示したが、これに限られず、拡散シート６の面積や必要とされる照明光の明るさ等に応じて行数及び列数（点状発光素子モジュール７の個数）を増減したり、隣り合う点状発光素子モジュール７，７のピッチを適宜変更するようにしてもよい。   Moreover, although the internal illumination type illuminating device 1 which concerns on the above-mentioned embodiment illustrated the aspect which arrange | positions a total of 12 point-like light emitting element modules 7 on the inner surface 8a of the baseplate 8, 2 rows 6 columns, The number of rows and the number of columns (the number of the point light emitting element modules 7) are increased or decreased according to the area of the diffusion sheet 6, the required brightness of the illumination light, and the like, or the adjacent point light emitting element modules 7 are not limited thereto. , 7 may be changed as appropriate.

また、上述の実施形態のようにマトリックス状に配置する態様に限られず、内照式照明装置１の出射面上で明るさの均一性が得られるように適宜、点状発光素子モジュール７の個々の間隔を変更するようにしてもよい。   Moreover, it is not restricted to the aspect arrange | positioned at matrix form like the above-mentioned embodiment, Each of the point light emitting element modules 7 is suitably suitably so that the uniformity of brightness may be acquired on the output surface of the internal illumination type illuminating device 1. The interval may be changed.

また、上述の実施形態に係る内照式照明装置１は、図３に示すように、光反射部材１６における上凸曲面１６ａと下凸曲面１６ｂとの接続部に引いた接線Ｔの傾き角（接線Ｔと中心線ＣＬとのなす角）αの方が、点状発光素子モジュール７の光束中心軸１７から最大強度光１８の進行方向までの所定角度θよりも小さくなるように構成されている。しかし、光反射部材１６が最大強度光１８の進行方向と十分な隙間をもって且つ最大強度光１８の下方側（底板８側）に配置されている場合には、上凸曲面１６ａと下凸曲面１６ｂとの接続部に引いた接線Ｔの傾き角αを点状発光素子モジュール７の光束中心軸１７から最大強度光１８の進行方向までの所定角度θと等しくしてもよい。   Further, as shown in FIG. 3, the internally illuminated lighting device 1 according to the above-described embodiment has an inclination angle of the tangent line T drawn at the connection portion between the upper convex curved surface 16 a and the lower convex curved surface 16 b in the light reflecting member 16 ( The angle α formed between the tangent line T and the center line CL is configured to be smaller than a predetermined angle θ from the light beam central axis 17 of the point light emitting element module 7 to the traveling direction of the maximum intensity light 18. . However, when the light reflecting member 16 is disposed at a sufficient gap from the traveling direction of the maximum intensity light 18 and on the lower side (bottom plate 8 side) of the maximum intensity light 18, the upward convex curved surface 16a and the downward convex curved surface 16b. The inclination angle α of the tangent line T drawn to the connection portion may be made equal to a predetermined angle θ from the light beam central axis 17 of the point light emitting element module 7 to the traveling direction of the maximum intensity light 18.

また、上述の実施形態に係る内照式照明装置１の光反射部材１６は、図３に示すように、上凸曲面１６ａと、この上凸曲面１６ａの両側に接続される下凸曲面１６ｂ，１６ｂで形作られているが、下凸曲面１６ｂ，１６ｂに代えて、傾き角α（α＜θ、又はα＝θ）の傾斜平面としてもよい。また、光反射部材１６を上凸曲面だけで構成してもよい。   Further, as shown in FIG. 3, the light reflecting member 16 of the internally illuminated lighting device 1 according to the above-described embodiment includes an upward convex curved surface 16a and downward convex curved surfaces 16b connected to both sides of the upward convex curved surface 16a. However, instead of the downward convex curved surfaces 16b and 16b, an inclined plane with an inclination angle α (α <θ or α = θ) may be used. Further, the light reflecting member 16 may be composed only of an upwardly convex curved surface.

また、上述の実施形態に係る内照式照明装置１は、平面形状が長方形の底板８を示したが、これに限られず、底板８の平面形状が正方形の場合にも適用が可能である。   Moreover, although the internal illumination type illuminating device 1 which concerns on the above-mentioned embodiment showed the bottom plate 8 whose planar shape was a rectangle, it is not restricted to this, It can apply also when the planar shape of the bottom plate 8 is a square.

また、上述の実施形態に係る内照式照明装置１は、点状発光素子モジュール７としてＬＥＤモジュールを例示したが、これに限られず、ＬＥＤに代えて使用できる点状発光素子が出現した場合、その点状発光素子をＬＥＤに代えて使用してもよい。   Moreover, although the internal illumination type illuminating device 1 which concerns on the above-mentioned embodiment illustrated the LED module as the point light emitting element module 7, it is not restricted to this, When the point light emitting element which can be used instead of LED appeared, The point light emitting element may be used in place of the LED.

また、上述の実施形態に係る内照式照明装置１において、光反射部材１６の上凸曲面１６ａ及び下凸曲面１６ｂは、複数の曲率の曲面を滑らかに接続してなる曲面でもよく、また、単一の曲率の曲面でもよい。   Further, in the internal illumination device 1 according to the above-described embodiment, the upper convex curved surface 16a and the lower convex curved surface 16b of the light reflecting member 16 may be curved surfaces formed by smoothly connecting curved surfaces having a plurality of curvatures. A curved surface with a single curvature may be used.

また、上述の実施形態に係る内照式照明装置１において、リブ１５を２本使用して筐体２を補強しているが、これに限られず、筐体２そのものの強度や大きさ等に応じ、リブ１５を１本にするか、又は、リブ１５を３本以上の複数本にしてもよい。   Further, in the internally illuminating lighting device 1 according to the above-described embodiment, the casing 2 is reinforced by using two ribs 15. However, the present invention is not limited to this, and the strength or size of the casing 2 itself is increased. Accordingly, the number of ribs 15 may be one, or the number of ribs 15 may be three or more.

また、上述の実施形態に係る内照式照明装置１において、拡散シート６の厚みを約１ｍｍ以下の例を示したが、これに限られず、拡散透過性を有するシートを張力をかけて筐体に固定するものであって、その張力によって筐体が変形するのを防ぐためにリブが必要なもの全てに本発明を適用することが可能である。   Further, in the internally illuminated lighting device 1 according to the above-described embodiment, the example in which the thickness of the diffusion sheet 6 is about 1 mm or less has been shown. However, the present invention is not limited thereto, and the casing having diffusion permeability is applied with tension. It is possible to apply the present invention to anything that is fixed to the frame and requires a rib to prevent the casing from being deformed by the tension.

本願発明の内照式照明装置は、屋内外の広告パネルや案内パネル等を背面側から面状に照明するために使用される他、建造物の壁面や天井に設置される面状照明装置として使用することもでき、また、液晶表示パネルを背面側から面状に照明するバックライトして使用することも可能である。   The internally illuminated lighting device of the present invention is used to illuminate indoor and outdoor advertising panels, guide panels, etc. in a planar shape from the back side, and as a planar lighting device installed on the wall or ceiling of a building It can also be used, and it can also be used as a backlight that illuminates the liquid crystal display panel in a planar shape from the back side.

１……内照式照明装置、２……筐体、５……開口部分、６……拡散シート、７……点状発光素子モジュール、７ａ……発光中心、８……底板、８ａ……内表面、１０〜１３……側壁、１０ａ〜１３ａ……端縁、１０2ｂ，１２2ｂ……内壁面、１５……リブ、１６……光反射部材、１７……光束中心軸、１８……最大強度光、２１……光 DESCRIPTION OF SYMBOLS 1 ... Internal illumination type illuminating device, 2 ... Housing, 5 ... Opening part, 6 ... Diffusion sheet, 7 ... Point-like light emitting element module, 7a ... Light emission center, 8 ... Bottom plate, 8a ... Inner surface, 10-13... Sidewall, 10a-13a .. edge, 10 2 b, 12 2 b .. inner wall surface, 15... Rib, 16 .. light reflecting member, 17. ... light of maximum intensity, 21 ... light

Claims (2)

平面形状が四角形の底板とこの底板から立ち上がる４側壁とによって形成され、前記４側壁の端縁によって形作られる開口部分を有する箱形形状の筐体と、
前記筐体の内部側で且つ前記底板の内表面に複数取り付けられて発光する点状発光素子モジュールと、
前記筐体の前記開口部分に張力をかけられた状態で固定され、前記筐体の前記開口部分を塞ぐ光拡散性及び光透過性を有する拡散シートと、
隣り合う前記点状発光素子モジュールの間に位置し、前記４側壁のうちの対向する一対の側壁の内壁面に張り渡されて前記筐体の補強部材として機能する棒状のリブと、
を備えた内照式照明装置であって、
前記点状発光素子モジュールは、その発光中心を含み且つ前記底板の前記内表面に直交する仮想平面内において、前記発光中心を通り前記底板の前記内表面の法線方向へ延びる仮想軸を光束中心軸とすると、出射する光束のうちの最大強度光の進行方向が前記光束中心軸から所定角度（±θ）傾いた方向に位置するようになっており、
前記リブには、前記拡散シートに反射された後に到達した光を拡散反射する光反射部材が前記対向する一対の側壁のうちの一方から他方に至るまで取り付けられており、
前記リブ及び前記光反射部材は、前記隣り合う点状発光素子モジュールの前記最大強度光の進行方向よりも前記底板側に配置される、
ことを特徴とする内照式照明装置。 A box-shaped housing having a planar shape formed by a rectangular bottom plate and four side walls rising from the bottom plate, and having an opening formed by an edge of the four side walls;
A point-like light emitting element module that emits light by being attached to the inner surface of the housing and the inner surface of the bottom plate;
A diffusion sheet that is fixed in a state where tension is applied to the opening portion of the housing and has a light diffusibility and a light transmission property that closes the opening portion of the housing;
A rod-shaped rib that is located between the adjacent point light emitting element modules and is stretched over the inner wall surfaces of a pair of opposing side walls of the four side walls and functions as a reinforcing member of the housing;
An internally illuminated lighting device comprising:
The point-like light emitting element module has a light flux center with a virtual axis passing through the light emission center and extending in a normal direction of the inner surface of the bottom plate in a virtual plane including the light emission center and orthogonal to the inner surface of the bottom plate. If the axis, the traveling direction of the maximum intensity light out of the emitted light beam is positioned in a direction inclined by a predetermined angle (± θ) from the light beam central axis,
A light reflection member that diffuses and reflects light that has arrived after being reflected by the diffusion sheet is attached to the ribs from one of the pair of opposing side walls to the other,
The rib and the light reflecting member are disposed closer to the bottom plate than the traveling direction of the maximum intensity light of the adjacent point light emitting element modules.
An internally-illuminated illumination device. 前記光反射部材は、前記隣り合う点状発光素子モジュールの発光中心を含み且つ底板に直交する仮想平面内において、前記隣り合う点状発光素子モジュールの発光中心を前記底板の前記内表面に沿って結ぶ方向を左右方向とし、前記底板の前記内表面の法線方向を上方とすると、断面形状が左右対称形状であり、前記断面形状の中央部が上方へ向けて凸の滑らかな曲線形状であって、前記断面形状の前記中央部の両側が前記中央部とは逆凸形状の滑らかな曲線形状である、
ことを特徴とする請求項１に記載の内照式照明装置。 The light reflecting member includes a light emission center of the adjacent point light emitting element modules and is disposed along a virtual plane perpendicular to the bottom plate along the inner surface of the bottom plate. When the connecting direction is the left-right direction and the normal direction of the inner surface of the bottom plate is upward, the cross-sectional shape is a left-right symmetric shape, and the central portion of the cross-sectional shape is a smooth curved shape convex upward. In addition, both sides of the central portion of the cross-sectional shape is a smooth curved shape having a convex shape opposite to the central portion.
The internally-illuminated illumination device according to claim 1.
JP2009168539A 2009-07-17 2009-07-17 Internal illumination system Expired - Fee Related JP5444539B2 (en)

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