JP5853128B2 - lighting equipment - Google Patents

lighting equipment Download PDF

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JP5853128B2
JP5853128B2 JP2011161400A JP2011161400A JP5853128B2 JP 5853128 B2 JP5853128 B2 JP 5853128B2 JP 2011161400 A JP2011161400 A JP 2011161400A JP 2011161400 A JP2011161400 A JP 2011161400A JP 5853128 B2 JP5853128 B2 JP 5853128B2
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light
light source
housing
front side
casing
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JP2013026088A (en
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哲也 西
哲也 西
中野 貴之
貴之 中野
福田 恒
恒 福田
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Panasonic Intellectual Property Management Co Ltd
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本発明は、LED(Light emitting diode)等の固体発光素子と反射板とを組み合わせた照明器具に関する。   The present invention relates to a lighting fixture in which a solid light emitting element such as an LED (Light Emitting Diode) and a reflector are combined.

従来から低電力で高輝度の発光が可能なLEDと反射板とを組み合わせた照明器具が知られている(例えば、特許文献1及び2参照)。この種の照明器具の例を図9(a)乃至(c)に示す。この照明器具は、複数のLED10と、LED10からの光(光路を一点鎖線矢印で示す)を反射する反射板20と、正面側に開口を有しLED10及び反射板20を収容する筐体30と、筐体30の開口側に装着され光を拡散透過する拡散板40と、を備える。反射板20により反射された光は、拡散板40により種々の方向に拡散された後、正面側から居住空間等に対して照射される。   2. Description of the Related Art Conventionally, there has been known a lighting fixture in which an LED capable of emitting light with high power and high luminance and a reflector are combined (for example, see Patent Documents 1 and 2). Examples of this type of lighting fixture are shown in FIGS. This lighting fixture includes a plurality of LEDs 10, a reflecting plate 20 that reflects light from the LEDs 10 (an optical path is indicated by a one-dot chain arrow), a housing 30 that has an opening on the front side and accommodates the LEDs 10 and the reflecting plate 20. And a diffusion plate 40 that is attached to the opening side of the housing 30 and diffuses and transmits light. The light reflected by the reflecting plate 20 is diffused in various directions by the diffusing plate 40 and then irradiated to the living space or the like from the front side.

この照明器具は、更に、背面側に複数のLED50を副光源として備える。これらLED50からの光は、筐体30の背面近傍の側面に設けられた透光部31を通って背面側に照射される。   This lighting fixture further includes a plurality of LEDs 50 as auxiliary light sources on the back side. The light from these LEDs 50 is irradiated to the back side through the light transmitting portion 31 provided on the side surface near the back surface of the housing 30.

特開2010−40296号公報JP 2010-40296 A 特開2008−218114号公報JP 2008-218114 A

しかしながら、上述したような照明器具では、背面側に配光するために副光源のみが使用されているので、背面側に十分量の光を配光するには多くの副光源が必要となって製造コストが高くなる。また、正面側から照射される光がLED10の近傍に集中しがちなので、相対的に器具中央部が暗くなって照射光に輝度むらが生じ易い。   However, in the lighting fixture as described above, since only the sub-light source is used to distribute light to the back side, many sub-light sources are required to distribute a sufficient amount of light to the back side. Manufacturing cost increases. Moreover, since the light irradiated from the front side tends to concentrate on the vicinity of LED10, the center part of an instrument becomes comparatively dark and it is easy to produce uneven brightness in irradiated light.

本発明は、上記課題を解決するものであって、固体発光素子と反射板とを組み合わせた照明器具において、副光源を設けなくても又は従来器具と比べてより少ない副光源でも背面側に十分量の光を配光することができる照明器具を提供することを目的とする。また、本発明は、正面側から照射される光の輝度むらを低減することができる照明器具を提供することも目的とする。   The present invention solves the above-described problem, and in a lighting fixture that combines a solid light emitting element and a reflector, the auxiliary light source is not provided, or even if there are fewer auxiliary light sources than the conventional fixture, the rear side is sufficient. It aims at providing the lighting fixture which can distribute the quantity of light. Another object of the present invention is to provide a luminaire that can reduce uneven brightness of light emitted from the front side.

本発明の照明器具は、複数の光源と、これら光源からの光を反射して配光制御する反射板と、正面側に開口を有し光源及び反射板を収容する筐体と、この筐体の開口側に装着され光源からの光を拡散透過する拡散板と、を備え、前記複数の光源は、発光体としてLEDを有し、光軸を前記筐体の中心に向けた状態で前記開口を挟んで配置され、前記反射板は、前記光源からの光を正面側に反射する正面用反射面と、該正面用反射面よりも前記光源側に配置されて該光源からの光を背面側に反射する背面用反射面と、を有し、前記筐体は、背面近傍の側面に透光部を有し、前記背面用反射面により反射された光は、前記透光部を通って背面側に照射されることを特徴とする。 The luminaire of the present invention includes a plurality of light sources, a reflecting plate that reflects light from these light sources and controls light distribution, a housing that has an opening on the front side and accommodates the light source and the reflecting plate, and the housing. And a diffusion plate that diffuses and transmits light from the light source, and the plurality of light sources have LEDs as light emitters, and the opening with the optical axis directed toward the center of the casing. The reflective plate is disposed on the light source side with respect to the front reflective surface, and reflects the light from the light source on the back side. A reflective surface for the back surface that reflects the light, and the housing has a translucent portion on a side surface near the back surface, and the light reflected by the reflective surface for the back surface passes through the translucent portion and It is characterized by being irradiated to the side.

前記反射板は、前記筐体の中心に対して点対称で頂部が前記正面側に最も突出して形成され、前記正面用反射面は、前記頂部の周りに位置して前記背面側に窪んだ凹形状の曲面より形成され、前記背面用反射面は、前記正面用反射面の外周の稜線の周りに位置して該正面用反射面よりも立ち上がった凹形状の曲面より形成されていることが好ましい。   The reflector is symmetrical with respect to the center of the casing and has a top portion that protrudes most toward the front side, and the front reflective surface is a recess recessed around the top portion and recessed toward the back side. Preferably, the back reflecting surface is formed from a concave curved surface that is located around the ridge line on the outer periphery of the front reflecting surface and rises from the front reflecting surface. .

前記筐体は正面側から見て矩形状とされ、前記光源は筐体の四辺にそれぞれ配置されていることが好ましい。   It is preferable that the housing has a rectangular shape when viewed from the front side, and the light sources are respectively disposed on four sides of the housing.

前記筐体は正面側から見て矩形状とされ、前記光源が前記筐体の開口を挟んで互いに対向する二辺にそれぞれ配置されており、他の二辺の背面側近傍に背面側に向けて光を照射する副光源が設けられていることが好ましい。   The casing is rectangular when viewed from the front side, and the light source is disposed on each of two sides facing each other across the opening of the casing, and is directed toward the back side near the back side of the other two sides. It is preferable that a secondary light source for irradiating light is provided.

前記副光源は前記筐体と反射板との間に設けられ、前記反射板は前記副光源からの光の一部を正面側に透過させる孔を有することが好ましい。   It is preferable that the sub light source is provided between the housing and the reflection plate, and the reflection plate has a hole through which a part of light from the sub light source is transmitted to the front side.

本発明によれば、光源からの光の一部が背面側にも照射されるので、副光源を設けなくても又は従来の照明器具と比べてより少ない副光源でも背面側に十分量の光を配光することができる。また、光源の近傍には正面用反射面が配置されておらず、光源近傍においては多くの光が背面用反射面により背面側に照射される。従って、従来器具と比べて、正面側において光源近傍の拡散板に入射する光が少なくなり、光源近傍と器具中央部との間の照射光輝度差が小さくなって輝度むらが低減される。   According to the present invention, since a part of the light from the light source is also irradiated on the back side, a sufficient amount of light is not provided on the back side even if there is no auxiliary light source or there are fewer auxiliary light sources compared to conventional lighting fixtures. Can distribute light. Further, the front reflective surface is not disposed in the vicinity of the light source, and much light is irradiated to the back side by the back reflective surface in the vicinity of the light source. Therefore, compared with the conventional instrument, the light incident on the diffuser plate near the light source is reduced on the front side, and the difference in luminance of the irradiated light between the vicinity of the light source and the central part of the instrument is reduced, thereby reducing the luminance unevenness.

本発明の実施形態に係る照明器具を正面側から見た図。The figure which looked at the lighting fixture which concerns on embodiment of this invention from the front side. (a)は図1のI−I線断面図、(b)は図1のII−II線断面図。(A) is the II sectional view taken on the line of FIG. 1, (b) is the II-II sectional view taken on the line of FIG. 上記実施形態の第1の変形例に係る照明器具を正面側から見た図。The figure which looked at the lighting fixture which concerns on the 1st modification of the said embodiment from the front side. 図3のI−I線断面図。FIG. 4 is a cross-sectional view taken along the line II in FIG. 3. 上記実施形態の第2の変形例に係る照明器具を正面側から見た図。The figure which looked at the lighting fixture which concerns on the 2nd modification of the said embodiment from the front side. 図5のI−I線断面図。FIG. 6 is a cross-sectional view taken along the line I-I in FIG. 5. 上記実施形態の第3の変形例に係る照明器具を正面側から見た図。The figure which looked at the lighting fixture which concerns on the 3rd modification of the said embodiment from the front side. (a)は図7のI−I線断面図、(b)は図7のII−II線断面図。(A) is the II sectional view taken on the line of FIG. 7, (b) is the II-II sectional view taken on the line of FIG. (a)は従来の照明器具を正面側から見た図、(b)は(a)のI−I線断面図、(c)は(a)のII−II線断面図。(A) is the figure which looked at the conventional lighting fixture from the front side, (b) is the II sectional view taken on the line of (a), (c) is the II-II sectional view taken on the line of (a).

本発明の実施形態に係る照明器具について図1、図2を参照して説明する。本照明器具は、正面側より居住空間等に対して光を照射し、背面側を介して天井や壁等に取り付けられる。   The lighting fixture which concerns on embodiment of this invention is demonstrated with reference to FIG. 1, FIG. This luminaire irradiates the living space or the like from the front side and is attached to the ceiling, wall, or the like via the back side.

照明器具1は、複数の光源2と、光源2からの光を反射する反射板3と、正面側に開口を有し光源2及び反射板3を収容する筐体4と、筐体4の開口側に装着され光源2からの光を拡散透過する拡散板5と、光源2への電力供給を調節する電源回路6と、を備える。本実施形態においては、筐体4は正面側から見て(平面視が)矩形状とされ、筐体4の開口を挟んで互いに対向する二辺にそれぞれ棒状の光源2が筐体4内側に配置される。反射板3は、略三角柱形状とされ、長手方向頂部31が正面側に最も突出した状態で互いに対向する光源2の中間位置に配置される。反射板3は、光源2からの光を正面側に反射する正面用反射面32と、同光を背面側に反射する背面用反射面33と、を有する。正面用反射面32は、頂部31から各々の光源2方向に伸び、背面側に窪んだ凹形状の曲面より成る。背面用反射面33は、正面用反射面32に連なって正面用反射面32よりも光源2側に配置され、正面用反射面32よりも立ち上がった凹形状の曲面より成る。筐体4は、背面近傍の側面に光を透過させる透光部41を有する。背面用反射面33により反射された光は、この透光部41を通って背面側に照射される。   The luminaire 1 includes a plurality of light sources 2, a reflecting plate 3 that reflects light from the light sources 2, a housing 4 that has an opening on the front side and accommodates the light source 2 and the reflecting plate 3, and an opening of the housing 4 A diffusion plate 5 that is mounted on the side and diffuses and transmits light from the light source 2 and a power supply circuit 6 that adjusts power supply to the light source 2 are provided. In the present embodiment, the housing 4 is rectangular when viewed from the front (plan view), and the rod-shaped light sources 2 are disposed on the inside of the housing 4 on two sides facing each other across the opening of the housing 4. Be placed. The reflecting plate 3 has a substantially triangular prism shape, and is disposed at an intermediate position between the light sources 2 facing each other with the longitudinal top 31 protruding most toward the front side. The reflection plate 3 includes a front reflection surface 32 that reflects light from the light source 2 to the front side, and a back reflection surface 33 that reflects the same light to the back side. The front reflective surface 32 is formed of a concave curved surface extending from the top portion 31 in the direction of each light source 2 and recessed toward the back side. The back reflecting surface 33 is connected to the front reflecting surface 32 and is disposed closer to the light source 2 than the front reflecting surface 32, and is formed of a concave curved surface rising from the front reflecting surface 32. The housing 4 has a translucent portion 41 that transmits light on the side surface near the back surface. The light reflected by the back reflecting surface 33 is irradiated to the back side through the light transmitting portion 41.

各々の光源2は、発光体である複数のLED21と、LED21を実装する配線基板22と、LED21からの光を集光して狭角配光とすることで効率良く反射板3に入射させる集光レンズ23と、を有する。LED21は、例えば、白色光を発する白色LEDより構成される。配線基板22は、高い熱伝導率を有する材料、例えば、アルミニウム等の金属、ガラスエポキシ等の樹脂、又はセラミック等の無機材料を母材として構成される。配線基板22はLED21への給電を担う配線パターンを有し、この配線パターンは配電線を介してスイッチやマイコン等を備えた電源回路6に接続されている。電源回路6は、家庭用電源をLED21に適した電流及び電圧に変換すると共に、家庭用電源からLED21への電力供給を調節することによりLED21をオン/オフ制御及び調光制御する。各光源2は、反射板3に対する取付角度が調整可能に筐体4に保持される。なお、配線基板22上に実装されるLED21の数及び配線基板22上におけるLED21の配置は、図例のものに限定されない。また、筐体4内における光源2の配置も、本実施形態のものに限定されない。更に、各々の光源2は、それぞれ1つのLED21より構成されていてもよい。   Each light source 2 includes a plurality of LEDs 21 that are light emitters, a wiring board 22 on which the LEDs 21 are mounted, and a light collector 2 that condenses the light from the LEDs 21 so as to be efficiently incident on the reflector 3 by narrow-angle light distribution. And an optical lens 23. LED21 is comprised from white LED which emits white light, for example. The wiring board 22 is configured using a material having high thermal conductivity, for example, a metal such as aluminum, a resin such as glass epoxy, or an inorganic material such as ceramic as a base material. The wiring board 22 has a wiring pattern for supplying power to the LED 21, and this wiring pattern is connected to a power supply circuit 6 including a switch, a microcomputer, and the like via a distribution line. The power supply circuit 6 converts the home power supply into a current and voltage suitable for the LED 21, and controls the on / off control and dimming control of the LED 21 by adjusting the power supply from the home power supply to the LED 21. Each light source 2 is held by a housing 4 so that the mounting angle with respect to the reflector 3 can be adjusted. The number of LEDs 21 mounted on the wiring board 22 and the arrangement of the LEDs 21 on the wiring board 22 are not limited to those shown in the drawing. Further, the arrangement of the light sources 2 in the housing 4 is not limited to that of the present embodiment. Further, each light source 2 may be constituted by one LED 21.

反射板3は、金属や樹脂を母材として構成され、その表面に白塗装又は鏡面処理を施して高可視光反射性としたものとされる。鏡面処理は、例えば、アルミニウム蒸着や銀蒸着により成される。反射板3は、光源2からの光に合わせて反射拡散率が調整されることが好ましい。   The reflector 3 is made of a metal or resin as a base material, and has a surface that is white-coated or mirror-finished to have high visible light reflectivity. The mirror surface treatment is performed by, for example, aluminum vapor deposition or silver vapor deposition. It is preferable that the reflection diffusivity of the reflector 3 is adjusted according to the light from the light source 2.

筐体4は、高い熱伝導率と高い剛性を有する材料、例えば、アルミニウム等の金属やガラスエポキシ等の樹脂により構成される。筐体4の透光部41は、例えば、筐体4に設けられたスリットに光を拡散透過する拡散部材を配設することで設けられる。拡散部材は、例えば、光拡散材や気泡が分散された透光性材料や、表面にフロスト加工等によって凹凸が形成された透光性材料より構成される。光拡散材は、例えば、酸化チタンや炭酸カルシウム等をベースにした粒子より成り、透光性材料は、例えば、アクリルやポリカーボネート等の透明樹脂又は透明ガラスより成る。また、筐体4は、背面側の外面に照明器具1を天井や壁等に取り付けるための保持構造を有する。   The housing 4 is made of a material having high thermal conductivity and high rigidity, for example, a metal such as aluminum or a resin such as glass epoxy. The translucent part 41 of the housing 4 is provided, for example, by disposing a diffusion member that diffuses and transmits light in a slit provided in the housing 4. The diffusing member is made of, for example, a light diffusing material, a light transmissive material in which bubbles are dispersed, or a light transmissive material having irregularities formed on the surface by frosting or the like. The light diffusing material is made of, for example, particles based on titanium oxide, calcium carbonate, or the like, and the light transmissive material is made of, for example, a transparent resin such as acrylic or polycarbonate, or transparent glass. Moreover, the housing | casing 4 has a holding structure for attaching the lighting fixture 1 to a ceiling, a wall, etc. on the outer surface of the back side.

拡散板5は、上述の拡散部材と同様の透光性材料より構成され、50%以下の直線透過率を有することが好ましい。拡散板5を比較的硬度の高い材料より構成した場合には、拡散板5は、照明器具1を衝撃等から保護する外殻部材としても機能する。   The diffusing plate 5 is made of a light-transmitting material similar to that of the above diffusing member, and preferably has a linear transmittance of 50% or less. When the diffusing plate 5 is made of a material having a relatively high hardness, the diffusing plate 5 also functions as an outer shell member that protects the lighting fixture 1 from an impact or the like.

上記のように構成された照明器具1においては、光源2からの光の一部(光路を図2(a)に破線矢印で示す)は、背面用反射面33により反射された後、透光部41を通って背面側に照射される。また、光源2からの光の多くは、直接に拡散板5に入射する又は正面用反射面32により反射されてから拡散板5に入射して正面側へ照射される。このとき、光源2の近傍には正面用反射面32が配置されていないので、正面側において光源2の近傍からは光源2より直接に拡散板5へ入射した光のみが照射される。   In the luminaire 1 configured as described above, a part of the light from the light source 2 (the optical path is indicated by a broken-line arrow in FIG. 2A) is reflected by the back reflecting surface 33 and then translucent. Irradiated to the back side through the portion 41. In addition, most of the light from the light source 2 is directly incident on the diffusion plate 5 or reflected by the front reflection surface 32 and then enters the diffusion plate 5 and is irradiated to the front side. At this time, since the front reflecting surface 32 is not disposed in the vicinity of the light source 2, only light incident directly on the diffusion plate 5 from the light source 2 is irradiated from the vicinity of the light source 2 on the front side.

上述のように、本実施形態の照明器具1によれば、光源2からの光の一部が背面側にも照射されるので、副光源を設けなくても背面側に配光することができる。また、正面側において光源2の近傍からは光源2より直接に拡散板5へ入射した光のみが照射されるので、従来の照明器具と比べて光源2近傍から照射される光が少なくなり、光源2近傍と器具中央部との間の照射光輝度差が小さくなって輝度むらが低減される。   As described above, according to the luminaire 1 of the present embodiment, since a part of the light from the light source 2 is also irradiated on the back side, it is possible to distribute light to the back side without providing a secondary light source. . Moreover, since only the light directly incident on the diffusion plate 5 from the light source 2 is irradiated from the vicinity of the light source 2 on the front side, the light irradiated from the vicinity of the light source 2 is reduced as compared with the conventional lighting fixture. The difference in luminance of irradiated light between the vicinity of 2 and the central part of the instrument is reduced, and the luminance unevenness is reduced.

なお、本実施形態においては副光源を設けないものを例示したが、本発明はこれに限定されず、正面側から見て矩形状の筐体4の光源2が設けられていない二辺に副光源を配設してもよい。副光源は、例えば、筐体4の背面側の内面に設けられる。光源2が設けられた筐体4の二辺においては、光源2からの光が背面用反射面33により背面側に照射され、副光源が設けられた他の二辺においては、副光源からの光が背面側に照射される。従って、光源2が設けられた二辺においては副光源を設けなくても背面側に光を照射できるので、従来の照明器具に比べて、より少ない副光源で背面側に配光することができる。   In the present embodiment, the secondary light source is not provided. However, the present invention is not limited to this, and the secondary light source 2 of the rectangular casing 4 when viewed from the front side is provided on the two sides. A light source may be provided. The auxiliary light source is provided on the inner surface on the back side of the housing 4, for example. On the two sides of the housing 4 provided with the light source 2, the light from the light source 2 is irradiated to the back side by the back reflecting surface 33, and on the other two sides provided with the sub light source, the light from the sub light source is emitted. Light is irradiated to the back side. Therefore, since light can be irradiated to the back side without providing a sub-light source on the two sides where the light source 2 is provided, light can be distributed to the back side with fewer sub-light sources compared to conventional lighting fixtures. .

次に、本実施形態の第1の変形例に係る照明器具について図3、図4を参照して説明する。照明器具11では、正面側から見て矩形状の筐体4の四辺にそれぞれ棒状の光源2が筐体4内側に配置され、逆四角錐形状の反射板3が頂部31を正面側に突出させた状態で筐体4の中央に配置される。このような構成にすることで、照明器具1と比べて、より均一な照度で器具の四辺を発光させて輝度むらを低減することができると共に、背面側の四方に向けて光を照射することができる。   Next, the lighting fixture which concerns on the 1st modification of this embodiment is demonstrated with reference to FIG. 3, FIG. In the luminaire 11, the rod-shaped light sources 2 are arranged on the four sides of the rectangular housing 4 when viewed from the front side, and the reflecting plate 3 having the inverted quadrangular pyramid shape projects the top portion 31 to the front side. It is arranged in the center of the housing 4 in a state where By adopting such a configuration, it is possible to reduce the luminance unevenness by emitting light on the four sides of the fixture with a more uniform illuminance than in the lighting fixture 1, and to irradiate light toward the four sides on the back side. Can do.

次に、本実施形態の第2の変形例に係る照明器具について図5、図6を参照して説明する。照明器具12は、正面側から見て円形状の筐体4と、筐体4の内周面に円環状に分散配置された複数の光源2と、筐体4の中心に対して点対称となった逆円錐形状とされ頂部31を正面側に突出させた状態で配置された反射板3と、を備える。各々の光源2は、それぞれ光軸を筐体4の中心に向けた状態で配置される。反射板3の正面用反射面32は頂部31の周りに位置し、背面用反射面33は正面用反射面32の外周の稜線の周りに位置する。このような構成にすることで、照明器具1と比べて、より均一に光源2からの光を全方向に亘って照射することができるので、照明器具12を見る角度が変わってもユーザは輝度むらを感じ難くなる。なお、光源2は、例えば、配線基板22として屈曲性を有するフレキシブルプリント基板(FPC)を用いて構成され、筐体4の内周面に沿って配設されてもよい。   Next, the lighting fixture which concerns on the 2nd modification of this embodiment is demonstrated with reference to FIG. 5, FIG. The lighting fixture 12 is point-symmetric with respect to the center of the casing 4, a circular casing 4 as viewed from the front side, a plurality of light sources 2 distributed in an annular shape on the inner peripheral surface of the casing 4, and the center of the casing 4. And a reflecting plate 3 that is formed in an inverted conical shape with the top portion 31 projecting to the front side. Each light source 2 is arranged with its optical axis directed toward the center of the housing 4. The front reflecting surface 32 of the reflecting plate 3 is located around the top portion 31, and the rear reflecting surface 33 is located around the outer peripheral ridge line of the front reflecting surface 32. By adopting such a configuration, the light from the light source 2 can be radiated in all directions more uniformly as compared with the luminaire 1. It becomes difficult to feel unevenness. The light source 2 may be configured using, for example, a flexible printed circuit board (FPC) having flexibility as the wiring board 22, and may be disposed along the inner peripheral surface of the housing 4.

次に、本実施形態の第3の変形例に係る照明器具について図7、図8を参照して説明する。照明器具13は、図1、図2に示した照明器具1に複数の副光源7を配設したものである。各々の副光源7は、発光体であるLED71と、LED71を実装する副光源用の配線基板72と、を有する。LED71は、上述のLED21と同様に、例えば、白色LEDとされる。配線基板72は、上述の配線基板22と同様の材料より構成され、配線基板22と同様に電源回路6に接続される。副光源7は、正面側から見て矩形状の筐体4において光源2が設けられていない二辺にそれぞれ配置され、筐体4の背面側の内面に設けられる。本変形例においては、副光源7は、互いに対向した光源2の中間位置に、正面側を向いた状態で筐体4と反射板3との間に配置される。反射板3は、副光源7に対向する位置に、副光源7からの光を正面側に透過させる孔34と、副光源7からの光を背面側に反射する副光源用反射面35と、を有する。副光源7からの光の一部(光路を図8(a)に一点鎖線矢印で示す)は、孔34を通って正面側に照射される。一方、副光源7からの光の他部は、副光源用反射面35により反射された後、透光部41を通って背面側に照射される。照明器具13は、図8(b)に示されるように、光源2の光軸に平行な断面においては照明器具1と同一の構成を有する(図2(a)参照)。なお、副光源7の数及び配置は、本変形例のものに限定されず、所望の照度や配光を得るために適宜調整されればよい。   Next, the lighting fixture which concerns on the 3rd modification of this embodiment is demonstrated with reference to FIG. 7, FIG. The lighting fixture 13 has a plurality of auxiliary light sources 7 arranged on the lighting fixture 1 shown in FIGS. Each sub-light source 7 includes an LED 71 as a light emitter and a sub-light source wiring board 72 on which the LED 71 is mounted. The LED 71 is, for example, a white LED, similarly to the LED 21 described above. The wiring board 72 is made of the same material as that of the wiring board 22 described above, and is connected to the power supply circuit 6 similarly to the wiring board 22. The auxiliary light source 7 is disposed on each of two sides of the rectangular housing 4 where the light source 2 is not provided as viewed from the front side, and is provided on the inner surface on the back side of the housing 4. In the present modification, the sub light source 7 is disposed between the housing 4 and the reflector 3 in a state facing the front side at an intermediate position between the light sources 2 facing each other. The reflecting plate 3 has a hole 34 that transmits light from the sub-light source 7 to the front side, a sub-light source reflecting surface 35 that reflects light from the sub-light source 7 to the back side, and a position facing the sub-light source 7. Have A part of the light from the auxiliary light source 7 (the optical path is indicated by a one-dot chain line arrow in FIG. 8A) is irradiated through the hole 34 to the front side. On the other hand, the other part of the light from the sub-light source 7 is reflected by the sub-light source reflecting surface 35 and then irradiated to the back side through the translucent part 41. As shown in FIG. 8B, the lighting fixture 13 has the same configuration as the lighting fixture 1 in a cross section parallel to the optical axis of the light source 2 (see FIG. 2A). Note that the number and arrangement of the sub-light sources 7 are not limited to those of the present modification, and may be appropriately adjusted in order to obtain desired illuminance and light distribution.

この照明器具13によれば、光源2が設けられていない筐体4の辺における正面側及び背面側への光照射を副光源7により増加させることができる。これにより、照明器具1と比べて、より均一な照度で器具の四辺を発光させて輝度むらを低減することができると共に、背面側の四方に向けて光を照射することができる。また、従来の照明器具では副光源からの光だけが背面側に照射されるのに対し、照明器具13では副光源7からの光と背面用反射面33により反射された光源2からの光とが背面側に照射される。従って、従来器具と比べて、より少ない副光源でも背面側に十分量の光を配光することができる。   According to this lighting fixture 13, light irradiation to the front side and the back side of the side of the housing 4 where the light source 2 is not provided can be increased by the sub light source 7. Thereby, compared with the lighting fixture 1, while being able to light-emit four sides of a fixture with more uniform illumination intensity and to reduce a brightness nonuniformity, light can be irradiated toward four directions on the back side. Further, in the conventional lighting fixture, only the light from the sub-light source is irradiated on the back side, whereas in the lighting fixture 13, the light from the sub-light source 7 and the light from the light source 2 reflected by the back reflecting surface 33 are used. Is irradiated to the back side. Therefore, a sufficient amount of light can be distributed to the back side even with a smaller number of sub-light sources than in the conventional apparatus.

また、本実施形態及びいずれの変形例においても、配線基板22、72及び筐体4が熱伝導率の高い材料より構成されているので、LED21、71の発光に伴って生じた熱を効率良く外界へ放熱することができる。これにより、LED21、71の異常な温度上昇を防いでLED21、71の寿命を延ばすことができる。   Moreover, in this embodiment and any modification, since the wiring boards 22 and 72 and the housing 4 are made of a material having high thermal conductivity, the heat generated by the light emission of the LEDs 21 and 71 can be efficiently performed. It can dissipate heat to the outside world. Thereby, the abnormal temperature rise of LED21,71 can be prevented, and the lifetime of LED21,71 can be extended.

なお、本発明に係る照明器具は、上記実施形態及びその変形例に限定されず、種々の変形が可能である。例えば、光源及び副光源は、共に白色LEDに限定されず、他色のLEDより構成されてもよいし、冷陰極蛍光灯や有機EL等より構成されてもよい。また、副光源は、必ずしも筐体と反射板との間に設けられる必要はなく、副光源からの光が直接に拡散板や筐体の透光部に入射するように配設されてもよい。   In addition, the lighting fixture which concerns on this invention is not limited to the said embodiment and its modification, A various deformation | transformation is possible. For example, both the light source and the sub-light source are not limited to white LEDs, and may be composed of LEDs of other colors, or may be composed of cold cathode fluorescent lamps, organic ELs, or the like. Further, the auxiliary light source does not necessarily need to be provided between the housing and the reflecting plate, and the light from the auxiliary light source may be arranged so as to be directly incident on the diffusion plate or the translucent part of the housing. .

1、11、12、13 照明器具
2 光源
3 反射板
31 頂部
32 正面用反射面
33 背面用反射面
34 孔
4 筐体
41 透光部
5 拡散板
7 副光源
DESCRIPTION OF SYMBOLS 1, 11, 12, 13 Lighting fixture 2 Light source 3 Reflective plate 31 Top part 32 Front reflective surface 33 Back reflective surface 34 Hole 4 Case 41 Translucent part 5 Diffuser 7 Sub light source

Claims (5)

複数の光源と、これら光源からの光を反射して配光制御する反射板と、正面側に開口を有し光源及び反射板を収容する筐体と、この筐体の開口側に装着され光源からの光を拡散透過する拡散板と、を備えた照明器具において、
前記複数の光源は、発光体としてLEDを有し、光軸を前記筐体の中心に向けた状態で前記開口を挟んで配置され、
前記反射板は、前記光源からの光を正面側に反射する正面用反射面と、該正面用反射面よりも前記光源側に配置されて該光源からの光を背面側に反射する背面用反射面と、を有し、
前記筐体は、背面近傍の側面に透光部を有し、
前記背面用反射面により反射された光は、前記透光部を通って背面側に照射されることを特徴とする照明器具。
A plurality of light sources, a reflecting plate that controls light distribution by reflecting light from these light sources, a housing that has an opening on the front side and accommodates the light source and the reflecting plate, and a light source mounted on the opening side of the housing In a luminaire comprising a diffusion plate that diffuses and transmits light from
The plurality of light sources have LEDs as light emitters, and are arranged with the opening in the state where the optical axis is directed to the center of the casing,
The reflector is a front reflective surface that reflects light from the light source to the front side, and a rear reflection that is disposed closer to the light source than the front reflective surface and reflects light from the light source to the back side. And having a surface,
The housing has a translucent portion on the side surface near the back surface,
The light reflected by the reflective surface for the back surface is irradiated to the back side through the translucent part.
前記反射板は、前記筐体の中心に対して点対称で頂部が前記正面側に最も突出して形成され、
前記正面用反射面は、前記頂部の周りに位置して前記背面側に窪んだ凹形状の曲面より形成され、
前記背面用反射面は、前記正面用反射面の外周の稜線の周りに位置して該正面用反射面よりも立ち上がった凹形状の曲面より形成されていることを特徴とする請求項1に記載の照明器具。
The reflection plate is point-symmetric with respect to the center of the housing and is formed so that the top most protrudes toward the front side,
The front reflective surface is formed from a concave curved surface located around the top and recessed to the back side,
2. The back reflecting surface is formed of a concave curved surface that is located around an outer peripheral ridge line of the front reflecting surface and rises from the front reflecting surface. Lighting fixtures.
前記筐体は正面側から見て矩形状とされ、前記光源は筐体の四辺にそれぞれ配置されていることを特徴とする請求項1又は請求項2に記載の照明器具。   The lighting apparatus according to claim 1 or 2, wherein the casing is rectangular when viewed from the front side, and the light sources are respectively arranged on four sides of the casing. 前記筐体は正面側から見て矩形状とされ、前記光源が前記筐体の開口を挟んで互いに対向する二辺にそれぞれ配置されており、他の二辺の背面側近傍に背面側に向けて光を照射する副光源が設けられていることを特徴とする請求項1又は請求項2に記載の照明器具。   The casing is rectangular when viewed from the front side, and the light source is disposed on each of two sides facing each other across the opening of the casing, and is directed toward the back side near the back side of the other two sides. The lighting fixture according to claim 1, further comprising a sub-light source that emits light. 前記副光源は前記筐体と反射板との間に設けられ、前記反射板は前記副光源からの光の一部を正面側に透過させる孔を有することを特徴とする請求項4に記載の照明器具。   The said sub light source is provided between the said housing | casing and a reflecting plate, The said reflecting plate has a hole which permeate | transmits a part of light from the said sub light source to the front side. lighting equipment.
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