JP6292500B2 - lighting equipment - Google Patents

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JP6292500B2
JP6292500B2 JP2013203139A JP2013203139A JP6292500B2 JP 6292500 B2 JP6292500 B2 JP 6292500B2 JP 2013203139 A JP2013203139 A JP 2013203139A JP 2013203139 A JP2013203139 A JP 2013203139A JP 6292500 B2 JP6292500 B2 JP 6292500B2
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light
guide member
light emitting
emitting diode
peripheral surface
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JP2015069841A (en
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優樹 姫野
優樹 姫野
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Panasonic Intellectual Property Management Co Ltd
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Description

本発明は、照明器具に関するものである。より具体的には、発光ダイオードの光を導光部材に通すことにより発光ダイオードの発光面よりも広い面積を発光させる照明器具に関するものである。   The present invention relates to a lighting fixture. More specifically, the present invention relates to a lighting fixture that emits light of an area larger than a light emitting surface of a light emitting diode by passing light of the light emitting diode through a light guide member.

従来、照明器具として、発光ダイオードの光を導光部材に通すことにより発光ダイオードの発光面よりも広い面積を発光させるものが提供されている（例えば、特許文献１参照）。この種の照明器具を用いれば、導光部材を用いずに発光ダイオードの光を直接に出射させる場合に比べ、照明器具を直視したときの眩しさが抑えられる。また、天井に取り付けられる照明器具においては、上記のような導光部材を用いることで、下方から見える部分全体を発光させることが可能となる。   2. Description of the Related Art Conventionally, lighting fixtures have been provided that emit light over a light emitting surface of a light emitting diode by passing light of the light emitting diode through a light guide member (see, for example, Patent Document 1). If this kind of lighting fixture is used, compared with the case where the light of a light emitting diode is directly emitted without using a light guide member, glare when the lighting fixture is viewed directly can be suppressed. Moreover, in the lighting fixture attached to a ceiling, it becomes possible to light-emit the whole part visible from the bottom by using the above light guide members.

特開２０１３−２０７１６号公報JP2013-20716A

しかしながら、上記の照明器具において、発光ダイオードの光が導光部材において光が出射すべきでない面から漏れてしまった場合、発光ダイオードの光の取り出し効率が低下してしまう。   However, in the above-described lighting fixture, when light from the light emitting diode leaks from a surface where light should not be emitted from the light guide member, the light extraction efficiency of the light emitting diode is reduced.

本発明は、上記事由に鑑みて為されたものであり、その目的は、光の取り出し効率の改善が可能な照明器具を提供することにある。   This invention is made | formed in view of the said reason, The objective is to provide the lighting fixture which can improve the extraction efficiency of light.

本発明の照明器具は、発光ダイオードと、第１の隙間を空けて前記発光ダイオード側に向けられた入射面と、前記発光ダイオードとは逆側に向けられた出射面と、を有し、前記入射面から入射した前記発光ダイオードの光を導光して前記出射面から出射させる導光部材と、前記出射面を露出させる形で前記発光ダイオードと前記導光部材とを囲み内周面において前記発光ダイオードの光を反射する反射体とを備え、前記導光部材の前記入射面とは反対側には凹部が設けられており、前記出射面の面積は前記発光ダイオードの発光面積よりも大きく、前記反射体の内周面と前記導光部材の外周面との間には第２の隙間が空けられており、前記第１の隙間と前記第２の隙間とが繋がっており、前記反射体の前記内周面、前記導光部材の前記外周面及び前記凹部の内周面は、前記入射面の中央を共通の軸とする無限回回転対称な形状であり、前記反射体の前記内周面の内径は、前記共通の軸の方向において、前記入射面から離れるにつれて拡大幅が徐々に大きくなるように、徐々に大きくなっており、前記導光部材の前記外周面の外径は、前記共通の軸の方向において、前記入射面から離れるにつれて拡大幅が徐々に大きくなるように、徐々に大きくなっており、前記導光部材の前記凹部の内径は、前記共通の軸の方向において、前記入射面から離れるにつれて拡大幅が徐々に大きくなるように、徐々に大きくなっていることを特徴とする。
The lighting fixture of the present invention has a light emitting diode, an incident surface directed toward the light emitting diode with a first gap, and an exit surface directed to the opposite side of the light emitting diode, A light guide member that guides light of the light emitting diode that has entered from the incident surface and emits the light from the output surface, and surrounds the light emitting diode and the light guide member in a form that exposes the output surface, and the inner peripheral surface A reflector that reflects the light of the light emitting diode, and a recess is provided on the opposite side of the light incident surface of the light guide member, and the area of the light emitting surface is larger than the light emitting area of the light emitting diode, A second gap is provided between the inner peripheral surface of the reflector and the outer peripheral surface of the light guide member, and the first gap and the second gap are connected to each other, and the reflector The inner peripheral surface of the light guide member and the outer peripheral surface of the light guide member And the inner peripheral surface of the recess has an infinitely rotationally symmetric shape with the center of the incident surface as a common axis, and the inner diameter of the inner peripheral surface of the reflector is the direction of the common axis, The outer diameter of the outer peripheral surface of the light guide member increases in the direction of the common axis as the distance from the incident surface increases. The inner diameter of the concave portion of the light guide member is gradually increased as the distance from the incident surface increases in the direction of the common axis. , Characterized by gradually increasing .

上記の照明器具において、前記出射面は、微細な凹凸を有し、光を拡散して出射させることが望ましい。   In the above luminaire, it is desirable that the emission surface has fine irregularities and diffuses and emits light.

本発明によれば、反射体を省略する場合や、反射体の内周面と導光部材の外周面とを互いに密着させる場合に比べ、発光ダイオードの光の取り出し効率の改善が可能となる。   According to the present invention, the light extraction efficiency of the light emitting diode can be improved as compared with the case where the reflector is omitted or the case where the inner peripheral surface of the reflector and the outer peripheral surface of the light guide member are in close contact with each other.

本発明の実施形態を示す断面図である。It is sectional drawing which shows embodiment of this invention. 同上を示す分解斜視図である。It is a disassembled perspective view which shows the same as the above. 同上の導光部材の要部を示す断面図である。It is sectional drawing which shows the principal part of a light guide member same as the above. 比較例の要部を示す断面図である。It is sectional drawing which shows the principal part of a comparative example.

本発明は、発光ダイオード２と、発光ダイオード２側に向けられた入射面３１と発光ダイオード２とは逆側に向けられた出射面３３とを有し入射面３１から入射した発光ダイオード２の光を導光して出射面３３から出射させる導光部材３とを備える。また、本発明は、出射面３３を露出させる形で発光ダイオード２と導光部材３とを囲み内周面において発光ダイオード２の光を反射する反射体（器具本体１）を備える。反射体（器具本体１）の内周面と導光部材３の外周面との間には隙間が空けられている。   The present invention includes a light emitting diode 2, an incident surface 31 directed toward the light emitting diode 2, and an exit surface 33 directed toward the opposite side of the light emitting diode 2. And a light guide member 3 that guides the light from the light exit surface 33. The present invention also includes a reflector (apparatus main body 1) that surrounds the light emitting diode 2 and the light guide member 3 so as to expose the emission surface 33 and reflects the light of the light emitting diode 2 on the inner peripheral surface. A gap is provided between the inner peripheral surface of the reflector (the instrument body 1) and the outer peripheral surface of the light guide member 3.

出射面３３は、微細な凹凸（凹部３３１）を有し、光を拡散して出射させることが望ましい。   The exit surface 33 has fine irregularities (concave portion 331), and it is desirable to diffuse and emit light.

以下、本発明を実施するための最良の形態について、図面を参照しながら説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

本実施形態の照明器具は、図１及び図２に示すように、器具本体１と、発光ダイオード２と、導光部材３と、透光カバー４とを備える。器具本体１は例えばアルミダイカストからなる。また、導光部材３と透光カバー４とは、それぞれ、例えばアクリル樹脂（ＰＭＭＡ）やポリカーボネート（ＰＣ）やガラスのような、透光性を有する材料からなる。   The lighting fixture of this embodiment is provided with the fixture main body 1, the light emitting diode 2, the light guide member 3, and the translucent cover 4, as shown in FIG.1 and FIG.2. The instrument body 1 is made of, for example, aluminum die casting. Moreover, the light guide member 3 and the translucent cover 4 are each made of a translucent material such as acrylic resin (PMMA), polycarbonate (PC), or glass.

器具本体１は、下面に凹部１０を有する本体部１１と、本体部１１の下端から全周にわたって外向きに突出する環形状の鍔部１２とを有する。発光ダイオード２は、凹部１０の内底面において器具本体１に固定されている。発光ダイオード２は上下方向に扁平な形状であって、主に下面から下方へ光を出射させる。   The instrument main body 1 includes a main body portion 11 having a recess 10 on the lower surface, and an annular flange portion 12 that protrudes outward from the lower end of the main body portion 11 over the entire circumference. The light emitting diode 2 is fixed to the instrument body 1 on the inner bottom surface of the recess 10. The light emitting diode 2 has a flat shape in the vertical direction, and mainly emits light downward from the lower surface.

器具本体１は、板状であって天井面を構成する天井材６に設けられた埋込穴６０に埋め込まれる。埋込穴６０は本体部１１を挿通可能な程度に大きく且つ鍔部１２を挿通不可能な程度に小さくされ、埋込穴６０の内周と本体部１１の外周との間の隙間は下方から見て鍔部１２に覆われる。さらに、本体部１１の外周面には、板ばねからなり鍔部１２との間に天井材６を挟む取付ばね５１が取り付けられている。また、鍔部１２と透光カバー４との間には、例えば合成ゴムのような柔軟な材料からなる環形状のパッキン５２が挟まれている。さらに、鍔部１２と天井材６との間には、例えば金属からなるリング５３が挟まれる。   The instrument body 1 is embedded in an embedding hole 60 provided in a ceiling material 6 that is plate-shaped and forms a ceiling surface. The embedding hole 60 is made large enough to allow the main body 11 to be inserted and small enough not to allow the collar 12 to be inserted, and the gap between the inner periphery of the embedding hole 60 and the outer periphery of the main body 11 is from below. It is covered with the buttocks 12 as seen. Further, an attachment spring 51 is attached to the outer peripheral surface of the main body portion 11 and is made of a leaf spring and sandwiches the ceiling material 6 between the flange portion 12. Further, an annular packing 52 made of a flexible material such as synthetic rubber is sandwiched between the collar portion 12 and the translucent cover 4. Furthermore, a ring 53 made of, for example, metal is sandwiched between the flange 12 and the ceiling material 6.

透光カバー４は、下方から見て器具本体１と導光部材３とを覆う円形状である。透光カバー４は例えば乳白色であって、上方から入射した光を拡散させて下方へ出射させる。   The translucent cover 4 has a circular shape that covers the instrument main body 1 and the light guide member 3 when viewed from below. The translucent cover 4 is, for example, milky white, and diffuses light incident from above and emits it downward.

導光部材３の上端面は、発光ダイオード２に向けられた平面形状であって、下方から見て発光ダイオード２を覆う程度の面積を有する入射面３１となっている。発光ダイオード２の光の多くは、上記の入射面３１から導光部材３に入射する。   The upper end surface of the light guide member 3 has a planar shape directed toward the light emitting diode 2 and is an incident surface 31 having an area covering the light emitting diode 2 when viewed from below. Most of the light from the light emitting diode 2 enters the light guide member 3 from the incident surface 31.

また、導光部材３の下面の中央には凹部３２が設けられており、入射面３１から入射した光は凹部３２において反射される。導光部材３において凹部３２を囲む円環形状の下端面（つまり発光ダイオード２とは逆側である下側に向けられた面）は、上方（導光部材３内）から入射した光を拡散させて下方（導光部材３外）へ出射させる出射面３３となっている。上記のような出射面３３は、例えば図３に示すような微細な凹部（ディンプル）３３１または微細な凸部（図示せず）を多数設けるといったように、微細な凹凸を設けることで実現することができる。図３における矢印は光路の例を示す。また、出射面３３の面積は発光ダイオード２の発光面積よりも大きくされている。これにより、出射面３３の輝度は発光ダイオード２の輝度よりも低くなる。   In addition, a recess 32 is provided at the center of the lower surface of the light guide member 3, and light incident from the incident surface 31 is reflected by the recess 32. An annular lower end surface surrounding the recess 32 in the light guide member 3 (that is, a surface directed to the lower side opposite to the light emitting diode 2) diffuses light incident from above (in the light guide member 3). Thus, the light exit surface 33 is configured to emit downward (outside the light guide member 3). The exit surface 33 as described above can be realized by providing fine irregularities such as providing a large number of fine concave portions (dimples) 331 or fine convex portions (not shown) as shown in FIG. Can do. The arrows in FIG. 3 show examples of optical paths. The area of the emission surface 33 is larger than the light emission area of the light emitting diode 2. Thereby, the luminance of the emission surface 33 becomes lower than the luminance of the light emitting diode 2.

また、器具本体１の凹部１０の内周面と、導光部材３の外周面及び凹部３２の内周面ととは、互いに共通の対称軸に関して無限回回転対称な形状となっている。つまり、上記の対称軸に直交する断面での凹部１０と導光部材３の内周及び外周とは互いに同心の円形状である。上記の対称軸は、発光ダイオード２の発光面（下面）の中央と入射面３１の中央とに直交する。   In addition, the inner peripheral surface of the recess 10 of the instrument body 1, the outer peripheral surface of the light guide member 3, and the inner peripheral surface of the recess 32 have a shape that is infinitely rotationally symmetric about a common symmetry axis. That is, the concave portion 10 and the inner periphery and outer periphery of the light guide member 3 in a cross section orthogonal to the symmetry axis are concentric circles. The axis of symmetry is perpendicular to the center of the light emitting surface (lower surface) of the light emitting diode 2 and the center of the incident surface 31.

さらに、器具本体１の凹部１０の内径と、導光部材３の外径と、導光部材３の凹部３２の内径とは、それぞれ、下方に向かって徐々に大きくされている。また、上記の対称軸に沿った単位寸法あたりの上記の内径及び外径の拡大幅は下方に向かって徐々に大きくされている。   Furthermore, the inner diameter of the recess 10 of the instrument body 1, the outer diameter of the light guide member 3, and the inner diameter of the recess 32 of the light guide member 3 are gradually increased downward. Moreover, the expansion width of the inner diameter and the outer diameter per unit dimension along the symmetry axis is gradually increased downward.

また、凹部１０の内周面は、発光ダイオード２の光を拡散させて反射する拡散反射面となっている。すなわち、器具本体１が反射体である。上記のような拡散反射面は、白色に塗装することで実現してもよいし、微細な凹凸を設けること（粗面化）で実現してもよい。上記のように凹部１０の内周面を拡散反射面とすることで、凹部１０の内周面を鏡面とする場合に比べ、透光カバー４の輝度を均一にすることが比較的に容易になる。   Further, the inner peripheral surface of the recess 10 is a diffuse reflection surface that diffuses and reflects the light of the light emitting diode 2. That is, the instrument body 1 is a reflector. The diffuse reflection surface as described above may be realized by painting in white, or may be realized by providing fine irregularities (roughening). As described above, by making the inner peripheral surface of the concave portion 10 a diffuse reflection surface, it is relatively easy to make the brightness of the translucent cover 4 uniform compared to the case where the inner peripheral surface of the concave portion 10 is a mirror surface. Become.

発光ダイオード２から出射して導光部材３の入射面３１に入射した光は、主に、図１の矢印７１のように導光部材３内で反射を繰り返した後、出射面３３から出射して、透光カバー４の外周付近を通じて下方へ出射する。   The light emitted from the light emitting diode 2 and incident on the incident surface 31 of the light guide member 3 is repeatedly reflected within the light guide member 3 as indicated by an arrow 71 in FIG. Then, the light is emitted downward through the vicinity of the outer periphery of the translucent cover 4.

また、図１の矢印７２，７３のように、発光ダイオード２から出射して導光部材３の入射面３１に入射せず器具本体１の凹部１０の内周面で反射された光は、導光部材３の外周面に入射し凹部３２の内面から出射して、透光カバー４の中央部を通じて下方に出射する。   Further, as indicated by arrows 72 and 73 in FIG. 1, the light that is emitted from the light emitting diode 2 and does not enter the incident surface 31 of the light guide member 3 and is reflected by the inner peripheral surface of the recess 10 of the instrument body 1 is guided. The light enters the outer peripheral surface of the optical member 3, exits from the inner surface of the recess 32, and exits downward through the central portion of the translucent cover 4.

さらに、対称軸に直交する断面において、導光部材３の外径は、器具本体１の内径よりも小さくされており、これにより、導光部材３の外周面と凹部１０の内周面との間には全周にわたって隙間（空隙）が空いている。   Furthermore, in the cross section orthogonal to the symmetry axis, the outer diameter of the light guide member 3 is made smaller than the inner diameter of the instrument body 1, whereby the outer peripheral surface of the light guide member 3 and the inner peripheral surface of the recess 10. There is a gap (gap) between them all around.

上記構成によれば、器具本体１（反射体）が存在しない場合や、導光部材３の外周面と器具本体１の凹部１０の内周面とが互いに密着する場合に比べ、発光ダイオード２の光の取り出し効率の改善が可能となる。   According to the said structure, compared with the case where the instrument main body 1 (reflector) does not exist or the outer peripheral surface of the light guide member 3 and the inner peripheral surface of the recessed part 10 of the instrument main body 1 mutually adhere, The light extraction efficiency can be improved.

本発明者の実験によれば、導光部材３において内側からの光に対する外周面の反射率は、図４のように導光部材３の外周面と器具本体１の凹部１０の内周面とを互いに密着させた場合には最大でも９７％とすることしかできなかった。これに対し、図１のように導光部材３の外周面と凹部１０の内周面との間に隙間が空いている場合には上記の反射率を９９％とすることができた。   According to the experiment of the present inventor, the reflectance of the outer peripheral surface with respect to the light from the inside in the light guide member 3 is as follows. When they were brought into close contact with each other, the maximum could only be 97%. On the other hand, when there is a gap between the outer peripheral surface of the light guide member 3 and the inner peripheral surface of the recess 10 as shown in FIG. 1, the above reflectance could be 99%.

また、本発明者のシミュレートによると、発光ダイオード２の光束が１０００ｌｍの場合に導光部材３の下方へ出射される光束（以下、「出射光束」と呼ぶ。）は、器具本体１（反射体）が存在しない場合には４８０．２ｌｍとなった。また、図４のように導光部材３の外周面と器具本体１の凹部１０の内周面とが互いに密着する場合には上記の出射光束は５３０．３ｌｍとなった。これに対し、図１のように導光部材３の外周面と器具本体１の凹部１０の内周面との間に空隙が存在する場合には上記の出射光束は６４２．５ｌｍとなった。   Further, according to the simulation of the present inventor, when the luminous flux of the light emitting diode 2 is 1000 lm, the luminous flux emitted below the light guide member 3 (hereinafter referred to as “emitted luminous flux”) is the instrument body 1 (reflected). 480.2 lm when the body was not present. Moreover, when the outer peripheral surface of the light guide member 3 and the inner peripheral surface of the concave portion 10 of the instrument body 1 are in close contact with each other as shown in FIG. 4, the emitted light flux is 530.3 lm. On the other hand, when an air gap exists between the outer peripheral surface of the light guide member 3 and the inner peripheral surface of the recess 10 of the instrument body 1 as shown in FIG. 1, the emitted light flux is 642.5 lm.

１ 器具本体（反射体）
２ 発光ダイオード
３ 導光部材
３１ 入射面
３３ 出射面
３３１ 凹部 1 Instrument body (reflector)
2 Light-emitting diode 3 Light guide member 31 Entrance surface 33 Output surface 331 Recess

Claims (2)

発光ダイオードと、
第１の隙間を空けて前記発光ダイオード側に向けられた入射面と、前記発光ダイオードとは逆側に向けられた出射面と、を有し、前記入射面から入射した前記発光ダイオードの光を導光して前記出射面から出射させる導光部材と、
前記出射面を露出させる形で前記発光ダイオードと前記導光部材とを囲み内周面において前記発光ダイオードの光を反射する反射体とを備え、
前記導光部材の前記入射面とは反対側には凹部が設けられており、
前記出射面の面積は前記発光ダイオードの発光面積よりも大きく、
前記反射体の内周面と前記導光部材の外周面との間には第２の隙間が空けられており、
前記第１の隙間と前記第２の隙間とが繋がっており、
前記反射体の前記内周面、前記導光部材の前記外周面及び前記凹部の内周面は、前記入射面の中央を共通の軸とする無限回回転対称な形状であり、
前記反射体の前記内周面の内径は、前記共通の軸の方向において、前記入射面から離れるにつれて拡大幅が徐々に大きくなるように、徐々に大きくなっており、
前記導光部材の前記外周面の外径は、前記共通の軸の方向において、前記入射面から離れるにつれて拡大幅が徐々に大きくなるように、徐々に大きくなっており、
前記導光部材の前記凹部の内径は、前記共通の軸の方向において、前記入射面から離れるにつれて拡大幅が徐々に大きくなるように、徐々に大きくなっていることを特徴とする照明器具。 A light emitting diode;
An incident surface directed toward the light emitting diode with a first gap therebetween, and an exit surface directed toward the opposite side of the light emitting diode, the light of the light emitting diode incident from the incident surface being A light guide member that guides and emits light from the exit surface;
A reflector that surrounds the light emitting diode and the light guide member in a form that exposes the emission surface and reflects light of the light emitting diode on an inner peripheral surface;
A recess is provided on the side of the light guide member opposite to the incident surface,
The area of the emission surface is larger than the light emitting area of the light emitting diode,
A second gap is provided between the inner peripheral surface of the reflector and the outer peripheral surface of the light guide member;
The first gap and the second gap are connected ,
The inner peripheral surface of the reflector, the outer peripheral surface of the light guide member, and the inner peripheral surface of the recess are infinitely rotationally symmetric with the center of the incident surface as a common axis,
The inner diameter of the inner peripheral surface of the reflector is gradually increased so that the enlarged width gradually increases with distance from the incident surface in the direction of the common axis,
The outer diameter of the outer peripheral surface of the light guide member is gradually increased so that the enlarged width gradually increases as the distance from the incident surface increases in the direction of the common axis.
The illumination apparatus according to claim 1, wherein an inner diameter of the concave portion of the light guide member is gradually increased so that an enlarged width is gradually increased with distance from the incident surface in the common axis direction . 前記出射面は、微細な凹凸を有し、光を拡散して出射させることを特徴とする請求項１記載の照明器具。
The lighting apparatus according to claim 1, wherein the emission surface has fine irregularities and diffuses and emits light.
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