JP6298986B2 - Lighting device - Google Patents

Lighting device Download PDF

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JP6298986B2
JP6298986B2 JP2014085162A JP2014085162A JP6298986B2 JP 6298986 B2 JP6298986 B2 JP 6298986B2 JP 2014085162 A JP2014085162 A JP 2014085162A JP 2014085162 A JP2014085162 A JP 2014085162A JP 6298986 B2 JP6298986 B2 JP 6298986B2
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leds
guide plate
light
substrate
light guide
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JP2015207345A (en
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藤田 勝
勝 藤田
雄介 日下
雄介 日下
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Panasonic Intellectual Property Management Co Ltd
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本発明は、点光源に用いた照明装置に関する。特に、光源として、LED(発光ダイオード)を用いた照明装置に関する。 The present invention relates to an illumination device used for a point light source. In particular, the present invention relates to a lighting device using an LED (light emitting diode) as a light source.

映像機器などに使用される薄型バックライトや照明装置において、薄型化や額縁レス等で発光面範囲を広く均一に発光させることが求められている。照明装置においても発光面積の広い均一に光る薄型の照明が求められている。   2. Description of the Related Art Thin backlights and lighting devices used for video equipment and the like are required to emit light with a wide light emitting surface range uniformly and thinly and without a frame. There is also a need for thin lighting that emits light uniformly and has a wide light emitting area in lighting devices.

従来の薄型で額縁レスの照明装置において、正面全体を光らせる構成として特許文献1がある。特許文献1の従来技術の照明装置について、図6を用いて説明する。   In a conventional thin and frameless lighting device, there is Patent Literature 1 as a configuration that shines the entire front surface. The prior art lighting device of Patent Document 1 will be described with reference to FIG.

図6は、従来の照明装置300の断面図である。透明な導光板22の背面にLED光源21を配している。導光板22のLED光源21に対向する光照射面には、その頂点をLED光源21の発光中心の直上に持つ光入射プリズム28が形成されている。光入射プリズム28の反射面の外側に凸形状の微細プリズム23が形成されている。導光板22の裏面には内側に凹形状の複数の微細プリズム24が形成されている。   FIG. 6 is a cross-sectional view of a conventional lighting device 300. An LED light source 21 is disposed on the back surface of the transparent light guide plate 22. On the light irradiation surface of the light guide plate 22 facing the LED light source 21, a light incident prism 28 having a vertex right above the light emission center of the LED light source 21 is formed. A convex fine prism 23 is formed outside the reflecting surface of the light incident prism 28. On the back surface of the light guide plate 22, a plurality of concave fine prisms 24 are formed inside.

LED光源21は、基板30に実装されており、基板30と導光板22は筐体25にセットされている。導光板22の裏面には、出射方向に光をだすための反射板27が設けられている。さらに、導光板22の側面方向から漏れる光を導光板22内にもどすための反射シート26が筐体側面の内面に貼られている。   The LED light source 21 is mounted on a substrate 30, and the substrate 30 and the light guide plate 22 are set in a housing 25. On the back surface of the light guide plate 22, a reflection plate 27 is provided for emitting light in the emission direction. Further, a reflection sheet 26 for returning light leaking from the side surface direction of the light guide plate 22 into the light guide plate 22 is attached to the inner surface of the side surface of the housing.

この構成で、導光板22の光照射面側に光拡散板29を設けることによって、LED光源21を用いて直下照明型の照明装置300を実現することができる。その結果、この照明装置100では、薄型軽量である。さらに、液晶表示装置にこの構造を用いると、非表示部分である額縁をなくすことが可能である。   With this configuration, by providing the light diffusion plate 29 on the light irradiation surface side of the light guide plate 22, the direct illumination type illumination device 300 can be realized using the LED light source 21. As a result, the lighting device 100 is thin and lightweight. Further, when this structure is used for a liquid crystal display device, it is possible to eliminate a frame which is a non-display portion.

特開2005−322549号公報JP 2005-322549 A

しかし、特許文献1の照明装置300では、平面状にしか発光しない。また、導光板22の左右の終端が平面であることから、その終端部からの光りの漏れがあり、光が不均質である。さらに、導光板22の終端部から強い光が発生し、輝線ムラとなる。側面は不透過の筐体25に覆われているため、側面は発光しない。   However, the illumination device 300 of Patent Document 1 emits light only in a planar shape. Further, since the left and right ends of the light guide plate 22 are flat, there is leakage of light from the end portions, and the light is non-homogeneous. In addition, strong light is generated from the terminal portion of the light guide plate 22 and bright line unevenness occurs. Since the side surface is covered by the opaque housing 25, the side surface does not emit light.

よって、本願では、均質な光を発光する、薄型で額縁レスの照明装置を実現することを課題とする。   Therefore, an object of the present application is to realize a thin and frameless lighting device that emits uniform light.

上記課題を解決するために、複数のLEDを有する基板と、複数のLED間の基板上に位置し、複数のLEDを覆う内側反射部材と、複数のLEDの外側の基板上に位置する外側反射部材と、内側反射部材の上に位置する導光板と、導光板の上方に位置する拡散カバーと、を含む照明装置であり、基板と内側反射部材と外側反射部材と導光板とで、複数のLEDを囲む空間を形成した照明装置を用いる。   In order to solve the above-mentioned problem, a substrate having a plurality of LEDs, an inner reflection member that is located on a substrate between the plurality of LEDs and covers the plurality of LEDs, and an outer reflection that is located on a substrate outside the plurality of LEDs. A lighting device including a member, a light guide plate located on the inner reflection member, and a diffusion cover located above the light guide plate, and includes a substrate, an inner reflection member, an outer reflection member, and a light guide plate. An illumination device in which a space surrounding the LED is formed is used.

照明装置の正面とともに、側面へも、均一な光を照射できる薄型の照明装置が実現される。 A thin illuminating device capable of irradiating uniform light to the side as well as the front of the illuminating device is realized.

(a)本発明の実施の形態1の照明装置の斜視図、(b)本発明の実施の形態1の照明装置の断面図、(c)〜(d)本発明の実施の形態1の照明装置の中の導光板の裏面の平面図(A) The perspective view of the illuminating device of Embodiment 1 of this invention, (b) Sectional drawing of the illuminating device of Embodiment 1 of this invention, (c)-(d) The illumination of Embodiment 1 of this invention Plan view of the back side of the light guide plate in the device 本発明の実施の形態1の照明装置の端部の拡大断面図The expanded sectional view of the edge part of the illuminating device of Embodiment 1 of this invention 実施の形態1の照明装置のLED位置での水平断面図Horizontal sectional view in LED position of the illuminating device of Embodiment 1. FIG. 本発明の実施の形態2の照明装置の端部の拡大断面図The expanded sectional view of the edge part of the illuminating device of Embodiment 2 of this invention 本発明の実施の形態3の照明装置の端部の拡大断面図The expanded sectional view of the edge part of the illuminating device of Embodiment 3 of this invention 従来の特許文献1の照明装置の断面図Sectional drawing of the illuminating device of the conventional patent document 1

以下本発明を実施の形態について、図面を参照しながら説明する。
(実施の形態1)
本発明の実施の形態1における照明装置について、図1(a)〜図1(d)を用いて説明する。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
A lighting device according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 (a) to 1 (d).

図1(a)は、本発明の実施の形態1の照明装置100の斜視図である。図1(b)は、照明装置100の長手方向に垂直な面での断面図である。図1(c)、図1(d)は、照明装置100の内部の導光板102の内面の表面を示す図である。   Fig.1 (a) is a perspective view of the illuminating device 100 of Embodiment 1 of this invention. FIG. 1B is a cross-sectional view taken along a plane perpendicular to the longitudinal direction of the lighting device 100. FIG. 1C and FIG. 1D are diagrams showing the inner surface of the light guide plate 102 inside the illumination device 100.

照明装置100は、直方体であり、内部にLED106、導光板102と、内側反射部材104と、外側反射部材103と、基板105とを含み、外側は拡散カバー101で覆われている。   The lighting device 100 is a rectangular parallelepiped, and includes an LED 106, a light guide plate 102, an inner reflection member 104, an outer reflection member 103, and a substrate 105 inside, and the outer side is covered with a diffusion cover 101.

<導光板102>
導光板102は、全体として平面状で、両端が曲がっていて、曲面部102a、102c、平面部102bとからなる。導光板102は、図1(b)に示すように、LED106からの光を、空間110を通して受ける。その後、光は、導光板102の内部を伝わりながら、上方へ放射される。具体的には、光は、曲面部102a、102cで曲げられ、平面部102bへ伝達される。平面部102bの裏面、つまり、下側の面には、図1(c)、図1(d)に示すように、プリズム109が設けられている。光をその部分で反射し、上方へ光を発光するものである。
<Light guide plate 102>
The light guide plate 102 has a planar shape as a whole and is bent at both ends, and includes curved surface portions 102a and 102c and a flat surface portion 102b. The light guide plate 102 receives light from the LED 106 through the space 110 as shown in FIG. Thereafter, the light is radiated upward while traveling through the light guide plate 102. Specifically, the light is bent by the curved surface portions 102a and 102c and transmitted to the flat surface portion 102b. As shown in FIG. 1C and FIG. 1D, a prism 109 is provided on the back surface of the flat portion 102b, that is, the lower surface. Light is reflected at that portion, and light is emitted upward.

図1(c)は、平面部102bを裏面から見た平面図の一部である。円錐状の凹形状のプリズム109がある。平面部102bの内部を伝達されてくる光を、プリズム109にて反射させ、光を上面へ出射する。円錐状の凹形状のプリズム109の深さは、0.1mm〜0.7mmで、ピッチが一定間隔で配置されている。光の出射を均質にするため、ピッチを可変し深さを一定にしても良い。   FIG.1 (c) is a part of top view which looked at the plane part 102b from the back surface. There is a conical concave prism 109. The light transmitted through the inside of the flat portion 102b is reflected by the prism 109 and emitted to the upper surface. The depth of the conical concave prism 109 is 0.1 mm to 0.7 mm, and the pitch is arranged at regular intervals. In order to make the emission of light uniform, the pitch may be varied to make the depth constant.

0.1mm〜0.7mmとした理由は、以下である。0.1mmより小さいと、輝度が低く、深さ誤差に対する影響が大きく好ましくない。一方、0.7mmを越えると、金型を用いた成形で形状形成する際、離型抵抗が大きく変形等生じやすい。ピッチ可変の場合、LED106から離れるほど、ピッチは狭くなり、プリズム溝が密になる。一方、ピッチ可変で、深さ一定にすると、金型を用いた成形で行う場合、離型抵抗のバランスがよくなり変形をおこしにくい。   The reason for setting to 0.1 mm to 0.7 mm is as follows. If it is smaller than 0.1 mm, the luminance is low and the influence on the depth error is large, which is not preferable. On the other hand, if the thickness exceeds 0.7 mm, the mold release resistance is large and deformation is likely to occur when forming a shape by molding using a mold. In the case of variable pitch, the further away from the LED 106, the narrower the pitch and the denser the prism grooves. On the other hand, if the pitch is variable and the depth is constant, when molding is performed using a mold, the balance of mold release resistance is improved and deformation is difficult to occur.

図1(d)は、図1(c)の変形例を示す。プリズム109として、三角柱状のプリズム溝を設けている。三角柱プリズムの深さは10〜50μmで形成されており、ピッチ一定間隔で配置される。光の出射を均質にするために、ピッチ深さを可変にしてもよい。   FIG.1 (d) shows the modification of FIG.1 (c). As the prism 109, a prismatic prism groove is provided. The triangular prisms have a depth of 10 to 50 μm and are arranged at a constant pitch. In order to make light emission uniform, the pitch depth may be variable.

深さが10μm〜50μmである理由は、以下である。10μmより小さいと輝度に対する深さ誤差の影響が大きく好ましくない。一方、50μmを越えると、金型を用いた成形で形状形成する際、離型抵抗が大きく変形を生じやすい。プリズム深さは、LED106から離れるほど深くなる。   The reason why the depth is 10 μm to 50 μm is as follows. If it is smaller than 10 μm, the influence of the depth error on the luminance is large, which is not preferable. On the other hand, when the thickness exceeds 50 μm, the mold release resistance is large and deformation is likely to occur when forming a shape by molding using a mold. The prism depth increases as the distance from the LED 106 increases.

ピッチ可変の場合は、LED106から離れるほど、ピッチは狭くなる。短い発光範囲の輝度制御をおこなう場合に、非常に微小なピッチにする必要がある。   When the pitch is variable, the pitch becomes narrower as the distance from the LED 106 increases. When performing luminance control in a short light emission range, it is necessary to have a very small pitch.

一方、ピッチ一定の場合、短い発光範囲の輝度制御をおこなう場合に、深さ可変は深さ制御で行い、輝度制御がよりしやすい。   On the other hand, when the pitch is constant, when performing brightness control of a short light emission range, variable depth is performed by depth control, and brightness control is easier.

LED106からの光は、導光板102内を全反射で進みながら、プリズム109で出射面側に光を反射させるようにしている。均質に光が出射されるように、プリズム109が設けられている。   The light from the LED 106 is reflected by the prism 109 toward the emission surface while proceeding through the light guide plate 102 with total reflection. A prism 109 is provided so that light is emitted uniformly.

<内側反射部材104>
内側反射部材104は、図1(b)に示すように、照明装置100の中央に位置する。両端に突起部を有する。突起部の下部で、LED106の上部を覆う。また、その下部で光を反射する。また、内側反射部材104は、全体として光を反射する。中央の部分は、導光板102の平面部102bの下部にあり、平面部102bからもれてきた光を反射する。LED106の光を反射させる。突起部の上が、導光板102の曲面部102cである。
<Inner reflection member 104>
The inner reflecting member 104 is located at the center of the lighting device 100 as shown in FIG. Protrusions at both ends. The upper part of the LED 106 is covered with the lower part of the protrusion. Moreover, light is reflected in the lower part. Further, the inner reflecting member 104 reflects light as a whole. The central portion is below the flat portion 102b of the light guide plate 102 and reflects light leaking from the flat portion 102b. The light of the LED 106 is reflected. Above the protrusion is the curved surface portion 102 c of the light guide plate 102.

<基板105>
基板105には、複数のLED106が実装されている。長方形の厚み1mmの板状であり、LED106を発光させるための回路パターンが形成されている。
<Substrate 105>
A plurality of LEDs 106 are mounted on the substrate 105. It is a rectangular plate having a thickness of 1 mm, and a circuit pattern for causing the LED 106 to emit light is formed.

基板105の厚さは照明装置100を、薄型化する上で、放熱性、強度面を考慮し0.5〜1.0mmが好ましい。   The thickness of the substrate 105 is preferably 0.5 to 1.0 mm in consideration of heat dissipation and strength in reducing the thickness of the lighting device 100.

基板105の厚みが、0.5mm未満になると、強度がもたない。そのため、基板105が湾曲し、その上にあるLED106と内側反射部材104との位置関係が一定でなくなり、光が不均一に出射される。   When the thickness of the substrate 105 is less than 0.5 mm, there is no strength. For this reason, the substrate 105 is curved, the positional relationship between the LED 106 and the inner reflection member 104 on the substrate 105 is not constant, and light is emitted unevenly.

一方、1.0mmより厚くなると、それを支えるフレーム107も厚くなり、照明器具全体の厚みが、数mm以上厚くなる。薄型の照明装置とならない。課題が解決できない。   On the other hand, when it becomes thicker than 1.0 mm, the frame 107 that supports it also becomes thick, and the thickness of the entire lighting fixture becomes several mm or more. It is not a thin lighting device. The problem cannot be solved.

<拡散カバー101>
拡散カバー101は、箱型形状である。導光板102からの光を外観上、さらに、均一化するために、拡散カバー101は、LED106の主発光方向となる面(上面)と、側面と、を覆うように構成する。カバーの色は乳白色で、透過率が60〜90%のものを使用する。
<Diffusion cover 101>
The diffusion cover 101 has a box shape. In order to make the light from the light guide plate 102 more uniform in appearance, the diffusion cover 101 is configured to cover the surface (upper surface) that is the main light emission direction and the side surfaces of the LED 106. The cover color is milky white and the transmittance is 60 to 90%.

導光板102からの光を拡散カバー101で拡散する機能をもち、材料の中に、拡散材が混入されている。この拡散カバー101は、光を吸収する特性をもち、その配合量によって透過率が変化する。照明の実使用上の光の利用効率と、均一発光のための光の拡散性とのバランスをみて、拡散カバー101の拡散材の配合量は、透過率として60%〜90%の領域から選定している。   It has a function of diffusing light from the light guide plate 102 with the diffusion cover 101, and a diffusing material is mixed in the material. The diffusion cover 101 has a characteristic of absorbing light, and the transmittance changes depending on the amount of the diffusion cover 101. Considering the balance between the light use efficiency in actual use of illumination and the light diffusibility for uniform light emission, the amount of the diffusion material of the diffusion cover 101 is selected from the region of 60% to 90% as the transmittance. doing.

透過率が、60%未満の場合は、光の透過率が悪い。このため、明るくするには、印加電圧を上げる必要がる。省エネルギーの観点から好ましくない。   When the transmittance is less than 60%, the light transmittance is poor. For this reason, it is necessary to increase the applied voltage to make it brighter. It is not preferable from the viewpoint of energy saving.

一方、90%より大きくなると、透明に近くなり、導光板、反射板からの光のわずかな光のムラが、そのまま、発光外観として現れる。照明器具の発光外観を低下させることとなる。また、点灯していない時に、外部から中の構造が見えてしまい、外観上よくない。   On the other hand, when it exceeds 90%, it becomes nearly transparent, and slight light unevenness of light from the light guide plate and the reflection plate appears as a light emitting appearance as it is. The luminous appearance of the luminaire will be reduced. Also, when not lit, the inside structure is visible from the outside, which is not good in appearance.

<外側反射部材103>
図1(b)に示すように、LED106の外側に、外側反射部材103を設けている。空間110に面する部分に、光を反射する凹部を有する。LED106の光を反射する。外側反射部材103と、内側反射部材104と、基板105とで、LED106と導光板102との間の空間110を挟む。その空間110の光を有効に導光板102へ伝える。
<Outside reflection member 103>
As shown in FIG. 1B, an outer reflecting member 103 is provided outside the LED 106. A portion that faces the space 110 has a recess that reflects light. The light of the LED 106 is reflected. The outer reflecting member 103, the inner reflecting member 104, and the substrate 105 sandwich the space 110 between the LED 106 and the light guide plate 102. The light in the space 110 is effectively transmitted to the light guide plate 102.

<材質、寸法>
導光板102の材質は透明のアクリル材料の成形品である。内側反射部材104及び外側反射部材103は白色の樹脂である。全体、どの部分でも光を反射できる。
<Material and dimensions>
The light guide plate 102 is a molded product of a transparent acrylic material. The inner reflecting member 104 and the outer reflecting member 103 are white resin. The whole and any part can reflect light.

拡散カバー101はアクリル又はポリカーボネート系の拡散剤の入った材質である。導光板102の板厚は、1.5mmである。照明装置100として5mm程度となる。薄型化のLED照明装置である。   The diffusion cover 101 is made of a material containing an acrylic or polycarbonate diffusion agent. The plate thickness of the light guide plate 102 is 1.5 mm. The lighting device 100 is about 5 mm. This is a thin LED lighting device.

<光の進路>
図2を用いて、端部での光の進路を説明する。図2は、図1の照明装置100の端部部分の拡大断面図である。矢印で光の進路を示す。導光板102は光の進路を示すため、斜線で表現していない。空間110に面する内側反射部材104の面を第1反射面201とする。空間110に面する外側反射部材103の面を第2反射面202とする。空間110に面する導光板102の面を入射面210とする。
<Path of light>
The path of light at the end will be described with reference to FIG. FIG. 2 is an enlarged cross-sectional view of an end portion of the illumination device 100 of FIG. The arrow shows the path of light. Since the light guide plate 102 indicates the path of light, it is not represented by diagonal lines. A surface of the inner reflective member 104 facing the space 110 is defined as a first reflective surface 201. A surface of the outer reflecting member 103 facing the space 110 is a second reflecting surface 202. A surface of the light guide plate 102 facing the space 110 is defined as an incident surface 210.

図2で、LED106から出た光の多くは、内側反射部材104の第1反射面201で反射され、外側反射部材103の第2反射面202に照射される。その後、光は、第2反射面202で反射され、入射面210より導光板102へ導かれる。   In FIG. 2, much of the light emitted from the LED 106 is reflected by the first reflecting surface 201 of the inner reflecting member 104 and is irradiated on the second reflecting surface 202 of the outer reflecting member 103. Thereafter, the light is reflected by the second reflecting surface 202 and guided to the light guide plate 102 from the incident surface 210.

この時、第1反射面201の焦点位置は、第2反射面202の裏面(空間110の外側)にあり、第2反射面202の焦点は、入射面210より導光板102内部(空間110の外側)にある。   At this time, the focal position of the first reflective surface 201 is on the back surface of the second reflective surface 202 (outside the space 110), and the focal point of the second reflective surface 202 is inside the light guide plate 102 (in the space 110) from the incident surface 210. On the outside).

<効果>
このような焦点の位置関係にすることで、光のロスが少なく、図2に示した光の進路どおりに、光が進む割合が、高い。LED106からの光が導光板102へ伝達できる。2回の反射により、光が均質化される。結果、光が均質に、照明装置100全体へ広がる。
<Effect>
By adopting such a focal position relationship, there is little light loss, and the rate of light traveling along the light path shown in FIG. 2 is high. Light from the LED 106 can be transmitted to the light guide plate 102. The light is homogenized by two reflections. As a result, light spreads uniformly throughout the lighting device 100.

<平面全体>
内側反射部材104と外側反射部材103の平面形状を図3に示す。図3は、照明装置100のLED106の位置(高さ)での水平方向断面図である。
<Whole plane>
The planar shapes of the inner reflecting member 104 and the outer reflecting member 103 are shown in FIG. FIG. 3 is a horizontal cross-sectional view at the position (height) of the LED 106 of the illumination device 100.

LED106が、両端に2列で直線状に並んでいる。   The LEDs 106 are linearly arranged in two rows at both ends.

内側反射部材104と外側反射部材103とが対向する面の形状に関して、LED106に近い部分は、突起部111が形成され、LED106から離れるところ(LED106間)は、凹んでいる。   With respect to the shape of the surface where the inner reflecting member 104 and the outer reflecting member 103 face each other, a protrusion 111 is formed in a portion close to the LED 106, and a portion away from the LED 106 (between the LEDs 106) is recessed.

LED106の光は、導光板102へ導入されず漏れる光が存在する。そのため、LED106に近いところは、LED106の強い光りがあり、LED106のないところ(LED106間)は光が弱い。この影響を無くするため、LED106に近いところの内側反射部材104に突起部111を設ける。一方、LED106間は、凹部を設ける。この結果、光が均質に出射される。   The light from the LED 106 is leaked without being introduced into the light guide plate 102. For this reason, the LED 106 has a strong light near the LED 106, and the light without the LED 106 (between the LEDs 106) is weak. In order to eliminate this influence, the protrusion 111 is provided on the inner reflecting member 104 near the LED 106. On the other hand, a recess is provided between the LEDs 106. As a result, light is emitted uniformly.

<効果>
実施の形態1の構造にすることで、従来は、拡散カバー101の側面が発光しない状態であったのに対して、拡散カバー101の上面と側面を均一に光らせることのできる照明装置100を提供できる。また、導光板102により全体に均質に光る。空間110の周辺の構造により、LED106の周辺の明るさも、均質化される。
<Effect>
By employing the structure of the first embodiment, a lighting device 100 that can uniformly illuminate the upper surface and the side surface of the diffusion cover 101 is provided, whereas the side surface of the diffusion cover 101 does not emit light conventionally. it can. Further, the light guide plate 102 shines uniformly on the whole. Due to the structure around the space 110, the brightness around the LED 106 is also homogenized.

(実施の形態2)
図4を用いて実施の形態2を説明する、図4は、照明装置100の端部部分の拡大断面図である。矢印で、LED106からの光の進路を示す。図2に対する図である。導光板102は光の進路を示すため、斜線で表現していない。空間110に面する内側反射部材104の面を第1反射面201とする。空間110に面する外側反射部材103の面を第2反射面202とする。空間110に面する導光板102の面を入射面210とする。
(Embodiment 2)
The second embodiment will be described with reference to FIG. 4. FIG. 4 is an enlarged cross-sectional view of an end portion of the lighting device 100. The arrow indicates the path of light from the LED 106. FIG. 3 is a diagram corresponding to FIG. 2. Since the light guide plate 102 indicates the path of light, it is not represented by diagonal lines. A surface of the inner reflective member 104 facing the space 110 is defined as a first reflective surface 201. A surface of the outer reflecting member 103 facing the space 110 is a second reflecting surface 202. A surface of the light guide plate 102 facing the space 110 is defined as an incident surface 210.

まず、光は、LED106から第1反射面201へ進む。そこで反射し、第2反射面202へ進む。第1反射面201と第2反射面202との間は、平行光線となる。   First, light travels from the LED 106 to the first reflecting surface 201. Then, the light is reflected and proceeds to the second reflecting surface 202. A parallel light beam is formed between the first reflecting surface 201 and the second reflecting surface 202.

第2反射面202で反射された光は、入射面210から導光板102へ入射される。   The light reflected by the second reflecting surface 202 enters the light guide plate 102 from the incident surface 210.

この構成により、平行光とするので、LED106の位置が任意にセットできる。また、光の均質性が向上する。
上記のように光が進むには、第1反射面201の焦点は、LED106にあり、第2反射面202の焦点は、導光板102内にある。
With this configuration, since the parallel light is used, the position of the LED 106 can be arbitrarily set. In addition, the homogeneity of light is improved.
In order for light to travel as described above, the focal point of the first reflective surface 201 is in the LED 106, and the focal point of the second reflective surface 202 is in the light guide plate 102.

<効果>
このような焦点の関係にすることで、光のロスが少なく、図4に示した光の進路どおりに、光が進む割合が、高い。LED106からの光を導光板102へ伝達できる。2回の反射により、光が均質化される。結果、光が均質に、照明装置100全体へ広がる。
<Effect>
By adopting such a focal relationship, there is little loss of light, and the rate of light traveling along the path of light shown in FIG. 4 is high. Light from the LED 106 can be transmitted to the light guide plate 102. The light is homogenized by two reflections. As a result, light spreads uniformly throughout the lighting device 100.

説明していない事項は、実施の形態1と同様である。   Matters not described are the same as those in the first embodiment.

(実施の形態3)
図5を用いて実施の形態3を説明する、図5は、照明装置100の端部部分の拡大断面図である。LED106からの光の進路を示す。図2、4と対応する図である。矢印で光の進路を示す。導光板102は光の進路を示すため、斜線で表現していない。空間110に面する内側反射部材104の面を第1反射面201とする。空間110に面する外側反射部材103の面を第2反射面202とする。空間110に面する導光板102の面を入射面210とする。空間110内の基板105の表面を第3反射面203とする。空間110に面する第1反射面201から繋がる内側反射部材104の平面を第4反射面204とする。
(Embodiment 3)
Embodiment 3 will be described with reference to FIG. 5. FIG. 5 is an enlarged cross-sectional view of an end portion of lighting device 100. The path of light from the LED 106 is shown. It is a figure corresponding to FIG. The arrow shows the path of light. Since the light guide plate 102 indicates the path of light, it is not represented by diagonal lines. A surface of the inner reflective member 104 facing the space 110 is defined as a first reflective surface 201. A surface of the outer reflecting member 103 facing the space 110 is a second reflecting surface 202. A surface of the light guide plate 102 facing the space 110 is defined as an incident surface 210. A surface of the substrate 105 in the space 110 is defined as a third reflecting surface 203. A plane of the inner reflective member 104 connected to the first reflective surface 201 facing the space 110 is a fourth reflective surface 204.

まず、光は、LED106から第1反射面201へ進む。そこで反射し、基板105面の第3反射面へ進む。第3反射面203で反射し、第4反射面204へ進む。そこで反射し、第2反射面202へ進む。そこで反射し、入射面210から導光板102へ入射される。   First, light travels from the LED 106 to the first reflecting surface 201. Then, the light is reflected and proceeds to the third reflection surface of the substrate 105 surface. Reflected by the third reflecting surface 203 and proceeds to the fourth reflecting surface 204. Then, the light is reflected and proceeds to the second reflecting surface 202. Then, the light is reflected and incident on the light guide plate 102 from the incident surface 210.

このような光の進路とするには、第3反射面203と第4反射面204とは、平行な関係にあり、第1反射面201の焦点は、第2反射面202よりLED106側にあり、第2反射面202の焦点は、導光板102内にある必要がある。   For such a light path, the third reflecting surface 203 and the fourth reflecting surface 204 are in a parallel relationship, and the focal point of the first reflecting surface 201 is closer to the LED 106 than the second reflecting surface 202. The focal point of the second reflecting surface 202 needs to be in the light guide plate 102.

この構成により、実施の形態1,2の場合より、光の反射回数がより多くなるので、より光の均質性が向上する。ただし、反射により、光の強度は落ちる。   With this configuration, the number of light reflections is greater than in the first and second embodiments, so that the homogeneity of light is further improved. However, the intensity of light decreases due to reflection.

説明していない事項は、実施の形態1と同様である。   Matters not described are the same as those in the first embodiment.

なお、上記実施の形態は組み合わせることができる。   Note that the above embodiments can be combined.

照明装置として広く利用できる。 Can be widely used as a lighting device.

21 光源
22 導光板
23 微細プリズム
24 微細プリズム
25 筐体
26 反射シート
27 反射板
28 光入射プリズム
29 光拡散板
30 基板
100 照明装置
101 拡散カバー
102 導光板
102a、102c 曲面部
102b 平面部
103 外側反射部材
104 内側反射部材
105 基板
106 LED
107 フレーム
109 プリズム
110 空間
111 突起部
201 第1反射面
202 第2反射面
203 第3反射面
204 第4反射面
210 入射面
300 照明装置

21 Light source 22 Light guide plate 23 Fine prism 24 Fine prism 25 Case 26 Reflective sheet 27 Reflective plate 28 Light incident prism 29 Light diffuser plate 30 Substrate 100 Illumination device 101 Diffusion cover 102 Light guide plates 102a and 102c Curved surface portion 102b Member 104 Inner reflecting member 105 Substrate 106 LED
107 Frame 109 Prism 110 Space 111 Protrusion 201 First reflection surface 202 Second reflection surface 203 Third reflection surface 204 Fourth reflection surface 210 Incident surface 300 Illumination device

Claims (6)

複数のLEDを有する基板と、
前記複数のLED間の前記基板の上方に位置し、前記複数のLEDを覆う内側反射部材と、
前記複数のLEDの外側の前記基板の上方に位置する外側反射部材と、
前記内側反射部材の上に位置する導光板と、
前記導光板の上方に位置する拡散カバーと、を含む照明装置であり、
前記基板と前記内側反射部材と前記外側反射部材と前記導光板とで、前記複数のLEDを囲む空間を形成し、
前記導光板は、前記空間を形成する入光面と、前記入光面に繋がる湾曲部と、前記湾曲部に繋がる平面部とを有する照明装置。
A substrate having a plurality of LEDs;
An inner reflective member that is located above the substrate between the plurality of LEDs and covers the plurality of LEDs;
An outer reflecting member located above the substrate outside the plurality of LEDs;
A light guide plate located on the inner reflective member;
A lighting device including a diffusion cover located above the light guide plate,
A space surrounding the plurality of LEDs is formed by the substrate, the inner reflection member, the outer reflection member, and the light guide plate,
The said light guide plate is an illuminating device which has the light-incidence surface which forms the said space, the curved part connected to the said light-incidence surface, and the plane part connected to the said curved part.
前記平面部には、光反射するプリズムが設けられている請求項1記載の照明装置。 The lighting device according to claim 1, wherein the planar portion is provided with a prism that reflects light. 複数のLEDを有する基板と、
前記複数のLED間の前記基板の上方に位置し、前記複数のLEDを覆う内側反射部材と、
前記複数のLEDの外側の前記基板の上方に位置する外側反射部材と、
前記内側反射部材の上に位置する導光板と、
前記導光板の上方に位置する拡散カバーと、を含む照明装置であり、
前記基板と前記内側反射部材と前記外側反射部材と前記導光板とで、前記複数のLEDを囲む空間を形成し、
前記内側反射部材は、前記空間を形成する面が第1反射面であり、
前記外側反射部材は、前記空間を形成する面が第2反射面であり、
前記内側反射部材の焦点は、前記第2反射面の外側に位置し、
前記外側反射部材の焦点は、前記導光板の内側に位置する照明装置。
A substrate having a plurality of LEDs;
An inner reflective member that is located above the substrate between the plurality of LEDs and covers the plurality of LEDs;
An outer reflecting member located above the substrate outside the plurality of LEDs;
A light guide plate located on the inner reflective member;
A lighting device including a diffusion cover located above the light guide plate,
A space surrounding the plurality of LEDs is formed by the substrate, the inner reflection member, the outer reflection member, and the light guide plate,
In the inner reflecting member, a surface forming the space is a first reflecting surface,
In the outer reflecting member, a surface forming the space is a second reflecting surface,
The focal point of the inner reflecting member is located outside the second reflecting surface,
The focus of the said outside reflective member is an illuminating device located inside the said light-guide plate.
複数のLEDを有する基板と、
前記複数のLED間の前記基板の上方に位置し、前記複数のLEDを覆う内側反射部材と、
前記複数のLEDの外側の前記基板の上方に位置する外側反射部材と、
前記内側反射部材の上に位置する導光板と、
前記導光板の上方に位置する拡散カバーと、を含む照明装置であり、
前記基板と前記内側反射部材と前記外側反射部材と前記導光板とで、前記複数のLEDを囲む空間を形成し、
前記内側反射部材は、前記空間を形成する面が第1反射面であり、
前記外側反射部材は、前記空間を形成する面が第2反射面であり、
前記内反射部材の焦点は、前記LEDに位置し、
前記外反射部材の焦点は、前記導光板の内側に位置する照明装置。
A substrate having a plurality of LEDs;
An inner reflective member that is located above the substrate between the plurality of LEDs and covers the plurality of LEDs;
An outer reflecting member located above the substrate outside the plurality of LEDs;
A light guide plate located on the inner reflective member;
A lighting device including a diffusion cover located above the light guide plate,
A space surrounding the plurality of LEDs is formed by the substrate, the inner reflection member, the outer reflection member, and the light guide plate,
In the inner reflecting member, a surface forming the space is a first reflecting surface,
In the outer reflecting member, a surface forming the space is a second reflecting surface,
The focus of the inner-side reflecting member is located on the LED,
Focal point of the outer-side reflecting member, the lighting devices located on the inside of the light guide plate.
複数のLEDを有する基板と、
前記複数のLED間の前記基板の上方に位置し、前記複数のLEDを覆う内側反射部材と、
前記複数のLEDの外側の前記基板の上方に位置する外側反射部材と、
前記内側反射部材の上に位置する導光板と、
前記導光板の上方に位置する拡散カバーと、を含む照明装置であり、
前記基板と前記内側反射部材と前記外側反射部材と前記導光板とで、前記複数のLEDを囲む空間を形成し、
前記内側反射部材は、前記空間を形成する面として、曲面の第1反射面と平面の第4反射面を有し、
前記外側反射部材は、前記空間を形成する面が曲面の第2反射面であり、
前記基板は、前記空間を形成する面が平面の第3反射面であり、
前記第3反射面と前記第4反射面とは平行であり、
前記第1反射面の焦点は、前記第2反射面より前記LED側に位置し、
前記第2反射面の焦点は、前記導光板の内側に位置する照明装置。
A substrate having a plurality of LEDs;
An inner reflective member that is located above the substrate between the plurality of LEDs and covers the plurality of LEDs;
An outer reflecting member located above the substrate outside the plurality of LEDs;
A light guide plate located on the inner reflective member;
A lighting device including a diffusion cover located above the light guide plate,
A space surrounding the plurality of LEDs is formed by the substrate, the inner reflection member, the outer reflection member, and the light guide plate,
The inner reflection member has a curved first reflection surface and a flat fourth reflection surface as surfaces forming the space,
The outer reflecting member is a second reflecting surface whose surface forming the space is a curved surface,
The substrate is a third reflecting surface whose surface forming the space is a plane,
The third reflecting surface and the fourth reflecting surface are parallel to each other,
The focal point of the first reflecting surface is located closer to the LED than the second reflecting surface,
The focus of the said 2nd reflective surface is an illuminating device located inside the said light-guide plate.
複数のLEDを有する基板と、
前記複数のLED間の前記基板の上方に位置し、前記複数のLEDを覆う内側反射部材と、
前記複数のLEDの外側の前記基板の上方に位置する外側反射部材と、
前記内側反射部材の上に位置する導光板と、
前記導光板の上方に位置する拡散カバーと、を含む照明装置であり、
前記基板と前記内側反射部材と前記外側反射部材と前記導光板とで、前記複数のLEDを囲む空間を形成し、
前記複数のLEDは、複数列に並び、
前記複数列の間に前記内側反射部材が位置し、
前記基板の上方で、前記内側反射部材は、前記複数列のそれぞれに対して凹凸形状となっていて、前記LED間では凹形状、前記LEDのところで凸形状である照明装置。
A substrate having a plurality of LEDs;
An inner reflective member that is located above the substrate between the plurality of LEDs and covers the plurality of LEDs;
An outer reflecting member located above the substrate outside the plurality of LEDs;
A light guide plate located on the inner reflective member;
A lighting device including a diffusion cover located above the light guide plate,
A space surrounding the plurality of LEDs is formed by the substrate, the inner reflection member, the outer reflection member, and the light guide plate,
The plurality of LEDs are arranged in a plurality of rows,
The inner reflection member is located between the plurality of rows,
Above the substrate, the inner reflection member has a concavo-convex shape for each of the plurality of rows, a concave shape between the LEDs, and a convex shape at the LED.
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