JP6156791B2 - lighting equipment - Google Patents

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JP6156791B2
JP6156791B2 JP2013003603A JP2013003603A JP6156791B2 JP 6156791 B2 JP6156791 B2 JP 6156791B2 JP 2013003603 A JP2013003603 A JP 2013003603A JP 2013003603 A JP2013003603 A JP 2013003603A JP 6156791 B2 JP6156791 B2 JP 6156791B2
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JP2014135233A (en
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恭平 中村
恭平 中村
岡田 敏純
敏純 岡田
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Panasonic Intellectual Property Management Co Ltd
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Description

本発明は、光源として発光ダイオード(LED)を用いた照明器具に関する。   The present invention relates to a luminaire using a light emitting diode (LED) as a light source.

発光ダイオード(以下、LED)は、低電力で高輝度の発光が可能であり、しかも長寿命であることから、白熱灯や蛍光灯等に代替する照明器具用の光源として注目されている。光源にLEDを用いた照明器具として、例えば、天井等に取り付けられるシーリングライトが普及している。このようなシーリングライトにおいては、従来の環状の蛍光ランプに換えて、複数のLEDを環状に配置し、各LEDの点灯状態を適宜に制御することにより、照明光の明るさや照射範囲を可変とすることができる。   Light-emitting diodes (hereinafter referred to as LEDs) are attracting attention as light sources for lighting fixtures that can replace incandescent lamps and fluorescent lamps because they can emit light with high luminance at low power and have a long lifetime. As a lighting fixture using an LED as a light source, for example, a ceiling light attached to a ceiling or the like is widely used. In such a ceiling light, instead of a conventional annular fluorescent lamp, a plurality of LEDs are arranged in an annular shape, and the lighting state and illumination range of illumination light can be varied by appropriately controlling the lighting state of each LED. can do.

しかしながら、LEDはその出射光の指向性が強いので、LEDをシーリングライトの光源とした用いた場合、粒々感が目立ち、輝度が不均一になり易い。そこで、LEDからの出射光を広範囲に拡散させるレンズ部材を用いた照明器具が知られている(例えば、特許文献1参照)。また、一般的に、LEDは、それ単体の発光光束が蛍光灯に比べて低いので、照明器具用の光源には複数のLEDが用いられる。例えば、上記特許文献1に記載された照明器具では、複数のLEDを環状に配して成るLED群が、同心円状に2列に配されている。この照明器具によれば、室内の広い範囲を照明するときは中心側及び外周側の両列のLED群を点灯させ、照明器具直下の狭い範囲を照明するときは中心側のLED群を点灯させる。これにより、シーンに応じた照明光を照射することができる。   However, since the LED has a strong directivity of the emitted light, when the LED is used as a light source for a ceiling light, the graininess is noticeable and the luminance tends to be uneven. Then, the lighting fixture using the lens member which diffuses the emitted light from LED in the wide range is known (for example, refer patent document 1). In general, an LED has a lower luminous flux than a fluorescent lamp, and therefore, a plurality of LEDs are used as a light source for a lighting fixture. For example, in the lighting fixture described in Patent Document 1, LED groups formed by arranging a plurality of LEDs in a ring shape are arranged in two rows concentrically. According to this lighting fixture, when illuminating a wide area in the room, the LED groups on both the central side and the outer peripheral side are turned on, and when illuminating a narrow range immediately below the lighting fixture, the central LED group is turned on. . Thereby, the illumination light according to a scene can be irradiated.

特開2012−146440号公報JP 2012-146440 A

ところで、上記のような光源にLEDを用いたシーリングライトにおいて、照明器具直下の狭い範囲を照明するときは、器具中心の輝度が高く、器具外周が暗く、器具中心から外周に向けて輝度が急に低下するように照明光を照射することが望ましいことがある。こうすれば、シーリングカバーにおける明暗の輪郭がハッキリしていて、シーリングライトでありながら、スポットライトのように、見栄え良く照明光を照射することができる。しかしながら、上記特許文献1の照明器具に用いられるレンズ部材は、LEDからの出射光を輝度ムラが生じないように拡散させるので、中心側のLED群を点灯させたとき、その照明光は、器具中心から外周に向けて緩やかに輝度が低下するように照射される。そのため、照明光が器具全体からぼんやりと照射されているように見える。   By the way, in a ceiling light using an LED as a light source as described above, when illuminating a narrow range directly under a lighting fixture, the brightness at the center of the fixture is high, the outer circumference of the fixture is dark, and the luminance suddenly increases from the center of the fixture toward the outer circumference. It may be desirable to irradiate the illumination light so as to decrease. In this way, the light and dark outline of the ceiling cover is clear, and the illumination light can be irradiated with a good appearance like a spotlight while being a ceiling light. However, since the lens member used in the lighting apparatus of Patent Document 1 diffuses the emitted light from the LED so that luminance unevenness does not occur, when the LED group on the center side is turned on, the illumination light is Irradiation is performed so that the luminance gradually decreases from the center toward the outer periphery. Therefore, it appears that the illumination light is gently emitted from the entire instrument.

本発明は、上記課題を解決するものであり、環状に配された複数のLEDを用い、シーンに応じて見栄え良く照明光を照射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。   This invention solves the said subject, and it aims at providing the lighting fixture which can irradiate illumination light with good appearance according to the scene using several LED arrange | positioned cyclically | annularly.

上記課題を解決するため、本発明は、器具本体と、前記器具本体の中央部を中心とする環状に配された複数のLEDと、前記LEDの光出射方向に設けられて該LEDから出射した光の配光を制御する光学部材と、を備え、前記光学部材は、前記LEDの発光部を覆い該LEDから出射した光が入射するドーム状の入射面と、前記入射面から入射した光が伝搬する媒質部と、前記媒質部を伝搬した光が出射する出射面と、を有し、前記入射面は、前記LEDの発光部の中心から前記入射面までの距離のうち、前記LEDの光軸方向の距離rと、前記器具本体の中央部方向の距離d1と、前記器具本体の外周方向の距離d2と、が、r/d2<1を満たし、前記媒質部は、前記LEDの光軸方向よりも前記器具本体の外周方向における肉厚が前記LEDの光軸方向よりも前記器具本体の中央部方向における肉厚よりも薄くなるように構成され、前記出射面は、前記LEDの光軸方向よりも前記器具本体の中央部方向における断面形状が前記中央部方向に凸形状となるように構成されていることを特徴とする。 In order to solve the above-described problems, the present invention provides an instrument main body, a plurality of LEDs arranged in an annular shape centering on the central part of the instrument main body, and the LED is provided in the light emission direction of the LED and emitted from the LED An optical member that controls light distribution, and the optical member covers a light emitting portion of the LED and receives a light incident from the LED, and a light incident from the light incident surface. A medium part that propagates, and an exit surface from which light propagated through the medium part exits, and the incident surface is a distance from the center of the light emitting part of the LED to the incident surface. The distance r in the axial direction, the distance d1 in the central direction of the instrument body, and the distance d2 in the outer peripheral direction of the instrument body satisfy r / d2 <1, and the medium portion is the optical axis of the LED. Thickness in the outer peripheral direction of the instrument body is ahead of the direction It is configured to be thinner than the thickness in the central part direction of the instrument body than the optical axis direction of the LED, and the emission surface has a cross-sectional shape in the central part direction of the instrument body rather than the optical axis direction of the LED. Is configured to have a convex shape in the central portion direction .

また、本発明は、器具本体と、前記器具本体の中央部を中心とする環状に配された複数のLEDと、前記LEDの光出射方向に設けられて該LEDから出射した光の配光を制御する光学部材と、を備え、前記光学部材は、前記LEDの発光部を覆い該LEDから出射した光が入射するドーム状の入射面と、前記入射面から入射した光が伝搬する媒質部と、前記媒質部を伝搬した光が出射する出射面と、を有し、前記入射面は、前記LEDの発光部の中心から前記入射面までの距離のうち、前記LEDの光軸方向の距離rと、前記器具本体の中央部方向の距離d1と、前記器具本体の外周方向の距離d2と、が、r/d1<1を満たし、前記媒質部は、前記LEDの光軸方向よりも前記器具本体の中央部方向における肉厚が前記LEDの光軸方向よりも前記器具本体の外周方向における肉厚よりも薄くなるように構成され、前記出射面は、前記LEDの光軸方向よりも前記器具本体の中央部方向における断面形状が略円形となるように構成されていることを特徴とするものであってもよい。In addition, the present invention provides a device main body, a plurality of LEDs arranged in an annular shape centering on a central portion of the device main body, and a light distribution of light emitted from the LEDs provided in the light emitting direction of the LEDs. An optical member for controlling, the optical member covering a light emitting portion of the LED, a dome-shaped incident surface on which light emitted from the LED is incident, and a medium portion on which light incident from the incident surface is propagated A light exit surface from which light propagated through the medium portion exits, and the entrance surface is a distance r in the optical axis direction of the LED out of a distance from the center of the light emitting portion of the LED to the entrance surface. And a distance d1 in the central direction of the instrument body and a distance d2 in the outer peripheral direction of the instrument body satisfy r / d1 <1, and the medium portion is more in the instrument than in the optical axis direction of the LED. The wall thickness in the direction of the center of the body is the direction of the optical axis of the LED So that the thickness of the light emitting device is thinner than the thickness in the outer peripheral direction of the device main body, and the emission surface has a substantially circular cross-sectional shape in the central portion direction of the device main body than in the optical axis direction of the LED. It may be characterized by being configured.

上記照明器具において、前記光学部材からの光出射方向に設けられて該光学部材から出射する光を拡散させて放射する拡散部材を更に備えることが好ましい。   It is preferable that the lighting apparatus further includes a diffusing member that is provided in a light emitting direction from the optical member and diffuses and emits light emitted from the optical member.

上記照明器具において、前記拡散部材は、光放射方向に凸形状又は凹形状であり、且つその中央部が平坦となるように形成されていることが好ましい。   In the above luminaire, it is preferable that the diffusing member has a convex shape or a concave shape in the light emission direction and is formed so that a central portion thereof is flat.

本発明によれば、LEDの光軸方向よりも器具中央方向及び外周方向において、照明光の輝度分布を変化させることができ、シーンに応じて見栄え良く照明光を照射することができる。   According to the present invention, the luminance distribution of illumination light can be changed in the direction of the center of the fixture and in the outer peripheral direction rather than in the direction of the optical axis of the LED, and illumination light can be illuminated with good appearance according to the scene.

本発明の一実施形態に係る照明器具の分解斜視図。The disassembled perspective view of the lighting fixture which concerns on one Embodiment of this invention. 同照明器具の側断面図。The sectional side view of the lighting fixture. 同照明器具に用いられる光学部材の一部断面を含む拡大斜視図。The expansion perspective view containing the partial cross section of the optical member used for the lighting fixture. (a)は参考例の光学部材の側断面図、(b)は参考例の光学部材による光路を示す図、(c)は参考例の光学部材による配光曲線を示す図、(d)は上記実施形態に係る照明器具の光学部材の側断面図、(e)は同光学部材による光路を示す図、(f)は同光学部材による配光曲線を示す図。(A) is a sectional side view of the optical member of the reference example, (b) is a diagram showing an optical path by the optical member of the reference example, (c) is a diagram showing a light distribution curve by the optical member of the reference example, (d) is The sectional side view of the optical member of the lighting fixture which concerns on the said embodiment, (e) is a figure which shows the optical path by the optical member, (f) is a figure which shows the light distribution curve by the optical member. 上記実施形態に係る照明器具の光学部材を用いたとき、及び参考例の光学部材を用いたときの各照明光の輝度断面図。The brightness | luminance sectional drawing of each illumination light when using the optical member of the lighting fixture which concerns on the said embodiment, and when using the optical member of a reference example. (a)は上記参考例の光学部材を用いたときの照明光の正面輝度分布を示す図、(b)は上記実施形態に係る照明器具の光学部材を用いたときの照明光の正面輝度分布を示す図。(A) is a figure which shows the front luminance distribution of the illumination light when using the optical member of the said reference example, (b) is the front luminance distribution of the illumination light when using the optical member of the lighting fixture which concerns on the said embodiment. FIG. (a)は上記実施形態とは別の拡散部材を用いた照明器具の側断面図、(b)は更に別の他の拡散部材を用いた照明器具の側断面図。(A) is a sectional side view of the lighting fixture using the diffusion member different from the said embodiment, (b) is a sectional side view of the lighting fixture using another diffusion member further. (a)は上記実施形態の変形例に係る照明器具に用いられる光学部材の一部断面を含む拡大斜視図。(b)は同光学部材を用いたときの照明光の輝度断面図、(c)は同照明光の正面輝度分布を示す図。(A) is an enlarged perspective view including the partial cross section of the optical member used for the lighting fixture which concerns on the modification of the said embodiment. (B) is a brightness | luminance sectional drawing of illumination light when the same optical member is used, (c) is a figure which shows front luminance distribution of the illumination light.

本発明の一実施形態に係る照明器具について、図1乃至図7を参照して説明する。図1及び図2に示すように、本実施形態の照明器具1は、器具本体2と、器具本体2の中央部を中心とする環状に配された複数の固体発光素子(以下、LED)3と、LED3の光出射方向に設けらてLED3から出射した光の配光を制御する光学部材4と、備える。また、照明器具1は、光学部材4からの光出射方向に設けられて光学部材4から出射する光を拡散させて放射する拡散部材(カバー)5を備える。本実施形態では、複数のLED3を環状に配して成るLED群3a、3bが、同心円状に2列に配されている。   The lighting fixture which concerns on one Embodiment of this invention is demonstrated with reference to FIG. 1 thru | or FIG. As shown in FIG. 1 and FIG. 2, a lighting fixture 1 of the present embodiment includes a fixture main body 2 and a plurality of solid state light emitting elements (hereinafter referred to as LEDs) 3 arranged in an annular shape around the central portion of the fixture main body 2. And an optical member 4 provided in the light emitting direction of the LED 3 to control the light distribution of the light emitted from the LED 3. The luminaire 1 includes a diffusing member (cover) 5 that is provided in the light emitting direction from the optical member 4 and diffuses and emits light emitted from the optical member 4. In this embodiment, LED groups 3a and 3b formed by arranging a plurality of LEDs 3 in an annular shape are arranged in two rows concentrically.

器具本体2は、円盤状の構造部材であり、天井等の施工面の反対側の面にLED3等が配置される。器具本体2の中央部には、施工面に設けられた給電コネクタ等に固定される給電部21が設けられる。また、給電部21の外周側には、LED3を点灯駆動するための点灯回路22と、LED3が実装される基板23と、が設けられる。器具本体2は、所定の剛性を有するアルミニウム板又は鋼板等の板材を、上記形状にプレス及び切削加工することにより形成され、LED等が配置される面には可視光の反射率が高い白色塗料が塗布又は反射性金属材料が蒸着されていてもよい。   The instrument body 2 is a disk-shaped structural member, and the LED 3 and the like are arranged on the surface opposite to the construction surface such as a ceiling. In the central part of the instrument main body 2, a power feeding unit 21 fixed to a power feeding connector or the like provided on the construction surface is provided. Further, a lighting circuit 22 for lighting and driving the LEDs 3 and a substrate 23 on which the LEDs 3 are mounted are provided on the outer peripheral side of the power feeding unit 21. The instrument body 2 is formed by pressing and cutting a plate material such as an aluminum plate or a steel plate having a predetermined rigidity into the above shape, and a white paint having a high visible light reflectivity on a surface on which an LED or the like is disposed. However, a coated or reflective metal material may be deposited.

給電部21は、汎用のアダプタガイドであり、給電コネクタ等を介して商用交流電源に接続される。点灯回路22は、給電部21から供給された交流電流をLED3に適合する所定電圧の直流電流に変換及び整流するための、トランス、コンデンサ及び制御用IC等を備える。基板23は、ガラスエポキシ樹脂等の絶縁材料から成り、LED3が実装される面に所定の配線パターンが形成されている。点灯回路22は、ユーザの操作に基づき、中心側のLED群3a及び外周側のLED群3bを夫々独立して点灯させることができるように構成されている。なお、各LED群3a、3b内の各LED3が個別に又は複数にグルーピングされて更に細かい部分点灯又は間引き点灯等が可能なように構成されていてもよい。   The power supply unit 21 is a general-purpose adapter guide, and is connected to a commercial AC power supply via a power supply connector or the like. The lighting circuit 22 includes a transformer, a capacitor, a control IC, and the like for converting and rectifying the alternating current supplied from the power supply unit 21 into a direct current having a predetermined voltage suitable for the LED 3. The substrate 23 is made of an insulating material such as glass epoxy resin, and a predetermined wiring pattern is formed on the surface on which the LED 3 is mounted. The lighting circuit 22 is configured to be able to light the central LED group 3a and the outer LED group 3b independently of each other based on a user operation. In addition, each LED3 in each LED group 3a, 3b may be comprised so that further partial lighting or thinning-out lighting etc. are possible by grouping individually or in groups.

LED3は、LEDチップの出射光の波長を変換する波長変換部材が被覆されて、LEDパッケージとして構成される。LEDチップには、例えば、青色光を放射するGaN系青色LEDチップが用いられ、波長変換部材には、封止用の透光性樹脂材料に昼白色や電球色の光を出射できるようにするための蛍光体が混入されたものが用いられる。   The LED 3 is configured as an LED package by covering with a wavelength conversion member that converts the wavelength of light emitted from the LED chip. For example, a GaN-based blue LED chip that emits blue light is used as the LED chip, and the wavelength conversion member can emit light of daylight white or light bulb color to the translucent resin material for sealing. For this purpose, a phosphor mixed with the phosphor is used.

光学部材4は、環状に配された複数のLED3を一括して覆う樋状のレンズ部材であり、アクリル樹脂等の透光性樹脂により形成される。本実施形態において、光学部材4は、器具中央側のLED群3aを覆う中央レンズ部4aと、器具外周側のLED群3bを覆う外側レンズ部4bと、を備える。本実施形態においては、これら中央レンズ部4a及び外側レンズ部4bは、光学部材4を器具本体2に固定するための基部40によって互いに接続され、これらは一体的に形成されている。なお、光学部材4は、LED3が実装される基板23の厚みに対応する調整部材24を介して器具本体2に固定される。   The optical member 4 is a bowl-shaped lens member that collectively covers a plurality of LEDs 3 arranged in an annular shape, and is formed of a light-transmitting resin such as an acrylic resin. In the present embodiment, the optical member 4 includes a central lens portion 4a that covers the LED group 3a on the center side of the fixture and an outer lens portion 4b that covers the LED group 3b on the outer peripheral side of the fixture. In the present embodiment, the central lens portion 4a and the outer lens portion 4b are connected to each other by a base portion 40 for fixing the optical member 4 to the instrument body 2 and are integrally formed. The optical member 4 is fixed to the instrument body 2 via an adjustment member 24 corresponding to the thickness of the substrate 23 on which the LED 3 is mounted.

カバー5は、器具本体2の前面を覆うドーム形状とされ、例えば、アクリル樹脂等の透光性材料に光拡散性粒子又は顔料等を添加した樹脂材料から形成される。カバー5は、上記の光拡散性粒子又は顔料等の添加に換えて、透明なガラス板又は樹脂板の表面又は裏面に、サンドブラスト処理を施して粗面としたもの、又はシボ加工を施したもの等であってもよい。   The cover 5 has a dome shape that covers the front surface of the instrument body 2 and is formed of a resin material obtained by adding light diffusing particles, pigments, or the like to a translucent material such as an acrylic resin. The cover 5 is obtained by subjecting the surface or back surface of a transparent glass plate or resin plate to a rough surface by applying a sandblasting treatment or a textured surface, instead of adding the above light diffusing particles or pigments. Etc.

図3に示すように、光学部材4は、上述した基部40に加え、LED3の発光部を覆いLED3から出射した光が入射するドーム状の入射面41と、入射面41から入射した光が伝搬する媒質部42と、媒質部42を伝搬した光が出射する出射面43と、を有する。   As shown in FIG. 3, in addition to the base 40 described above, the optical member 4 covers the light emitting part of the LED 3 and has a dome-shaped incident surface 41 on which light emitted from the LED 3 is incident, and light incident from the incident surface 41 propagates. And a light exit surface 43 from which light propagated through the medium portion 42 is emitted.

LED3の発光部の中心から入射面41までの距離は、LED3の光軸方向の距離rと、器具本体2の中央部方向の距離d1と、器具本体2の外周方向の距離d2と、がある。このうち、本実施形態においては、中央レンズ部4aの入射面41が、LED3の光軸方向の距離rと、器具本体2の外周方向の距離d2と、が、r/d2<1を満たす形状となるように構成されている。また、媒質部42は、LED3の光軸方向よりも器具本体2の外周方向における肉厚が、LED2の光軸方向よりも器具本体2の中央部方向における肉厚よりも薄くなるように構成されている。更に、出射面43は、LED3の光軸方向よりも器具本体2の外周方向における断面形状が略円形となるように、且つLED3の光軸方向よりも器具本体2の中央部方向における断面形状が、中央部方向に凸形状となるように構成されている。   The distance from the center of the light emitting portion of the LED 3 to the incident surface 41 includes a distance r in the optical axis direction of the LED 3, a distance d1 in the central portion direction of the instrument body 2, and a distance d2 in the outer peripheral direction of the instrument body 2. . Among these, in the present embodiment, the incident surface 41 of the central lens portion 4a has a shape in which the distance r in the optical axis direction of the LED 3 and the distance d2 in the outer peripheral direction of the fixture body 2 satisfy r / d2 <1. It is comprised so that. The medium portion 42 is configured such that the thickness in the outer peripheral direction of the fixture body 2 is thinner than the thickness in the central portion direction of the fixture body 2 than in the optical axis direction of the LEDs 2. ing. Further, the exit surface 43 has a cross-sectional shape in the outer peripheral direction of the instrument body 2 that is substantially circular rather than the optical axis direction of the LED 3, and has a cross-sectional shape in the central part direction of the instrument body 2 than the optical axis direction of the LED 3. Further, it is configured to have a convex shape in the central portion direction.

ここで、図4(a)に示すように、LED3の光軸方向の距離rと、器具本体2の外周方向の距離d2と、が、r/d2=1を満たす形状となるように構成された光学部材104を参考例として挙げる。なお、この参考例に係る光学部材104の媒質部142及び及び出射面143は、上記媒質部42及び出射面43と同様の形状とされている。この光学部材104の入射面141は、概ね半球状であるので、LED3の発光部の中心から放射状に出射された光の入射角は、LED3の光軸方向よりも器具本体2の中央部方向及び外周方向のいずれの方向においても小さい。そのため、図4(b)に示すように、屈折角も小さくなり、光学部材4に入射した光は、比較的広角に媒質部42を伝搬する。そして、出射面43は、LED3の光軸方向よりも器具本体2の外周方向における断面形状が略円形となるように形成されるので、この外周方向に伝搬した光は、大きく屈折することなく、光学部材4から拡散して出射される。一方、出射面43は、LED3の光軸方向よりも器具本体2の中央部方向における断面形状が、中央部方向に凸形状となるように形成されているので、この中央部方向に伝搬した光は、出射面43の突出方向に大きく屈折して、光学部材4から出射される。その結果、図4(c)に示すように、LED3の光軸方向よりも器具本体2の中央部方向だけでなく、外周方向にも、比較的全範囲に広角に光が出射される。   Here, as shown in FIG. 4A, the distance r in the optical axis direction of the LED 3 and the distance d2 in the outer peripheral direction of the instrument body 2 are configured to satisfy a shape satisfying r / d2 = 1. The optical member 104 is given as a reference example. Note that the medium portion 142 and the emission surface 143 of the optical member 104 according to this reference example have the same shape as the medium portion 42 and the emission surface 43. Since the incident surface 141 of the optical member 104 is generally hemispherical, the incident angle of the light emitted radially from the center of the light emitting portion of the LED 3 is greater in the direction of the central portion of the instrument body 2 than in the optical axis direction of the LED 3 and It is small in any direction of the outer circumferential direction. For this reason, as shown in FIG. 4B, the refraction angle is also reduced, and the light incident on the optical member 4 propagates through the medium part 42 at a relatively wide angle. And since the emission surface 43 is formed so that the cross-sectional shape in the outer peripheral direction of the instrument body 2 is substantially circular rather than the optical axis direction of the LED 3, the light propagating in the outer peripheral direction is not greatly refracted, The light is diffused and emitted from the optical member 4. On the other hand, since the emission surface 43 is formed so that the cross-sectional shape in the central portion direction of the instrument body 2 is more convex in the central portion direction than the optical axis direction of the LED 3, the light propagated in the central portion direction. Is largely refracted in the protruding direction of the emission surface 43 and is emitted from the optical member 4. As a result, as shown in FIG. 4 (c), light is emitted in a relatively wide range over the entire range, not only in the central direction of the instrument body 2 but also in the outer peripheral direction, rather than in the optical axis direction of the LED 3.

これに対して、図4(d)に示すように、入射面41がr/d2<1を満たす形状となるように構成された光学部材4では、上記光学部材104に比べて、LED3の光軸方向よりも器具本体2の外周方向に向かう光の入射角が大きくなる。そのため、図4(e)に示すように、屈折角も大きくなり、光学部材4に入射した光は、比較的、LED3の光軸方向に屈折して媒質部42を伝搬する。その結果、図4(f)に示すように、LED3の光軸方向よりも器具本体2外周方向においては、比較的、LED3の光軸方向に出射される光が多くなる。なお、ここでは、入射面41を、r=4.9、d2=5.5、r/d2=0.89となるように設計している。   On the other hand, as shown in FIG. 4D, in the optical member 4 configured so that the incident surface 41 has a shape satisfying r / d2 <1, the light of the LED 3 is lighter than that of the optical member 104. The incident angle of the light which goes to the outer peripheral direction of the instrument main body 2 becomes larger than the axial direction. Therefore, as shown in FIG. 4E, the refraction angle also increases, and the light incident on the optical member 4 is relatively refracted in the optical axis direction of the LED 3 and propagates through the medium portion 42. As a result, as shown in FIG. 4 (f), more light is emitted in the optical axis direction of the LED 3 in the outer peripheral direction of the instrument body 2 than in the optical axis direction of the LED 3. Here, the incident surface 41 is designed so that r = 4.9, d2 = 5.5, and r / d2 = 0.89.

図5は、上記のように構成された光学部材4及び光学部材104を、夫々照明器具1に組み込み、中央側のLED群3aを点灯させたときの器具正面の輝度断面図を示す。上記図4(c)及び図4(f)で示したように、LED3の光軸方向よりも器具本体2の中央方向に向かう光の配光は、光学部材4(r/d2<1)及び光学部材104(r/d2=1)のいずれも同様である。従って、光学部材4(実線)及び光学部材104(点線)のいずれを用いた場合においても、直下輝度、特に中央部が最も高くなる。   FIG. 5 is a luminance cross-sectional view of the front of the fixture when the optical member 4 and the optical member 104 configured as described above are incorporated in the lighting fixture 1 and the central LED group 3a is turned on. As shown in FIG. 4C and FIG. 4F, the light distribution toward the central direction of the fixture body 2 rather than the optical axis direction of the LED 3 is the optical member 4 (r / d2 <1) and All of the optical members 104 (r / d2 = 1) are the same. Therefore, in the case where any of the optical member 4 (solid line) and the optical member 104 (dotted line) is used, the luminance immediately below, particularly the central portion, is the highest.

一方、光学部材4(実線)を用いた場合、器具中央の周囲にも輝度が高くなるピークが存在し、この輝度ピークから周囲方向に急に輝度が低下する。これに対して、光学部材104(点線)を用いた場合、器具中央から外周方向に向けて緩やかに輝度が低下する。   On the other hand, when the optical member 4 (solid line) is used, there is a peak where the luminance increases around the center of the appliance, and the luminance suddenly decreases in the peripheral direction from the luminance peak. On the other hand, when the optical member 104 (dotted line) is used, the luminance gradually decreases from the center of the instrument toward the outer peripheral direction.

図6は、光学部材104(r/d2=1)及び光学部材4(r/d2<1)の各正面輝度分布を示す。図6(a)に示すように、光学部材104を用いた場合、照明光が器具全体からぼんやりと照射されているように見える。これに対して、図6(b)に示すように、光学部材4を用いた場合、器具直下の輝度が高く、器具外周が暗く、器具中心から外周に向けて輝度が急に低下するように照明光を照射することができる。これにより、シーリングカバーにおける明暗の輪郭がハッキリしていて、シーリングライトでありながら、スポットライトのように、見栄え良く照明光を照射することができる。   FIG. 6 shows respective front luminance distributions of the optical member 104 (r / d2 = 1) and the optical member 4 (r / d2 <1). As shown in FIG. 6A, when the optical member 104 is used, it appears that the illumination light is gently emitted from the entire instrument. On the other hand, as shown in FIG. 6B, when the optical member 4 is used, the brightness directly under the instrument is high, the instrument outer periphery is dark, and the brightness suddenly decreases from the instrument center toward the outer periphery. Illumination light can be irradiated. Thereby, the outline of the light and darkness in the ceiling cover is clear, and it is possible to irradiate illumination light with good appearance like a spotlight while being a ceiling light.

カバー5は、図1及び図2に示した形状に限らず、例えば、図7(a)に示すように、光放射方向に凸形状であり、且つその中央部が平坦となるように形成されていてもよい。また、図7(b)に示すように、光放射方向に凹形状であり、且つその中央部が平坦となるように形成されていてもよい。カバー5の平坦な部分は、その外径が上記図5で示した両外側の輝度ピークの幅と同じになるように形成されることが好ましい。こうすれば、中央寄りのLED群3aを点灯させたとき、カバー5の平坦な部分から照明光が照射されるので、より照明器具の見栄えを良くすることができる。   The cover 5 is not limited to the shape shown in FIGS. 1 and 2, and for example, as shown in FIG. 7A, the cover 5 has a convex shape in the light emission direction and is formed so that the central portion thereof is flat. It may be. Moreover, as shown in FIG.7 (b), it is concave shape in the light emission direction, and you may form so that the center part may become flat. The flat portion of the cover 5 is preferably formed so that the outer diameter thereof is the same as the width of the luminance peaks on both outer sides shown in FIG. In this way, when the LED group 3a closer to the center is turned on, the illumination light is emitted from the flat portion of the cover 5, so that the appearance of the luminaire can be improved.

次に、上記実施形態の変形例に係る照明器具について、図8を参照して説明する。この変形例に係る照明器具は、図8(a)に示すように、光学部材4における中央レンズ部4aの入射面41が、LED3の光軸方向の距離rと、器具本体2の中央部方向の距離d1と、r/d1<1を満たす形状になるように構成されている。また、媒質部42は、LED3の光軸方向よりも器具本体2の中央方向における肉厚が、LED2の光軸方向よりも器具本体2の外周方向における肉厚よりも薄くなるように構成されている。更に、出射面43は、LED3の光軸方向よりも器具本体2の中央部方向における断面形状が略円形となるように、且つLED3の光軸方向よりも器具本体2の外周方向における断面形状が、外周方向に凸形状となるように構成されている。この光学部材4によれば、上記実施形態の図4(e)及び図4(f)で示した光路及び配光と鏡面対象となる光路及び配光が得られる。   Next, the lighting fixture which concerns on the modification of the said embodiment is demonstrated with reference to FIG. As shown in FIG. 8A, in the lighting fixture according to this modification, the incident surface 41 of the central lens portion 4a of the optical member 4 has a distance r in the optical axis direction of the LED 3 and the central portion direction of the fixture body 2. The distance d1 and r / d1 <1 are satisfied. Further, the medium portion 42 is configured such that the thickness in the central direction of the instrument body 2 is thinner than the thickness in the outer peripheral direction of the instrument body 2 than the optical axis direction of the LED 2 than the optical axis direction of the LED 3. Yes. Furthermore, the exit surface 43 has a cross-sectional shape in the outer peripheral direction of the instrument body 2 that is substantially circular in cross-section in the central portion direction of the instrument body 2 relative to the optical axis direction of the LED 3 and in the direction of the optical axis of the LED 3. It is configured to have a convex shape in the outer peripheral direction. According to this optical member 4, the optical path and the light distribution shown in FIGS. 4E and 4F of the above embodiment and the optical path and the light distribution to be mirrored are obtained.

図8(b)は、この変形例における光学部材4(r/d1<1)を照明器具1に組み込み、中央側のLED群3aを点灯させたときの器具正面の輝度断面図を、図8(c)は、そのときの正面輝度分布を示す。これらの図に示されるように、光学部材4(r/d1<1)を用いた場合、照明器具の直下輝度のうち、特に中心部の輝度が低くなる。そのため、シーリングカバーにおける明暗の輪郭はドーナツ状になり、照明光をユニークに照射することができる。   FIG. 8B is a luminance cross-sectional view of the front of the fixture when the optical member 4 (r / d1 <1) in this modification is incorporated in the lighting fixture 1 and the central LED group 3a is turned on. (C) shows the front luminance distribution at that time. As shown in these figures, when the optical member 4 (r / d1 <1) is used, the luminance at the center portion is particularly low in the luminance immediately below the lighting fixture. Therefore, the light and dark outline of the ceiling cover has a donut shape, and illumination light can be uniquely irradiated.

なお、本発明は、上述した実施形態に限らず、種々の変形が可能である。光学部材4の入射面41は、r/d2<1又はr/d1<1の少なくとも一方を満たす形状に形成されていればよく、その両方を満たしていてもよい。すなわち、r/d1≧1及びr/d2≧1を満たさない、及びd1=d2を満たさなければよい。こうすれば、環状に複数のLEDを配した照明器具において、LEDの光軸方向よりも器具中央方向及び外周方向において、照明光の輝度分布を変化させることができ、シーンに応じて見栄え良く照明光を照射することができる。また、LED3から出射された光を効率的に光学部材4内に入射させられるように、入射面41は、r/d2及びr/d1が0.5以上となるように形成されることが望ましい。   The present invention is not limited to the above-described embodiment, and various modifications can be made. The incident surface 41 of the optical member 4 should just be formed in the shape which satisfy | fills at least one of r / d2 <1 or r / d1 <1, and may satisfy both. That is, r / d1 ≧ 1 and r / d2 ≧ 1 are not satisfied, and d1 = d2 is not satisfied. In this way, in a lighting fixture in which a plurality of LEDs are arranged in a ring shape, the luminance distribution of the illumination light can be changed in the fixture center direction and the outer peripheral direction rather than the LED optical axis direction, and the illumination is pleasing according to the scene. Light can be irradiated. Further, it is desirable that the incident surface 41 be formed so that r / d2 and r / d1 are 0.5 or more so that the light emitted from the LED 3 can be efficiently incident into the optical member 4. .

また、例えば、LED群及びレンズ部は2列に限らず、1列であっても3列以上であってもよい。更に、上記本実施形態及び変形例においては、中央レンズ部4aの入射面41がr/d2<1又はr/d1<1を満たす例を挙げたが、外側レンズ部4bも中央レンズ部4aと同様であってもよい。また、中央レンズ部4aの入射面41がr/d2<1を満たし、外側レンズ部4bの入射面41がr/d1<1を満たすように構成されていてもよい。この場合、中央側のLED群3a及び外周側のLED群3bを点灯させたとき、シーリングカバーにおける明暗の輪郭が、中央部から明→暗→明となり、明暗がリング状に広がるので、照明光をよりユニークに照射することができる。   For example, the LED group and the lens unit are not limited to two rows, and may be one row or three or more rows. Furthermore, in the said embodiment and the modification, although the incident surface 41 of the center lens part 4a gave the example which satisfy | fills r / d2 <1 or r / d1 <1, the outer side lens part 4b is also the center lens part 4a. It may be the same. Further, the incident surface 41 of the central lens portion 4a may satisfy r / d2 <1, and the incident surface 41 of the outer lens portion 4b may satisfy r / d1 <1. In this case, when the LED group 3a on the center side and the LED group 3b on the outer peripheral side are turned on, the light and dark outline in the ceiling cover changes from light to dark to light from the center, and the light and darkness spread in a ring shape. Can be irradiated more uniquely.

1 照明器具
2 器具本体
3 LED
4 光学部材
41 入射面
42 媒質部
43 出射面
5 拡散部材(カバー)
d1 LEDの発光部の中心から入射面までの距離のうちLEDの光軸方向の距離
d2 器具本体の中央部方向の距離
r 器具本体の外周方向の距離
1 lighting fixture 2 fixture body 3 LED
4 Optical member 41 Incident surface 42 Medium part 43 Output surface 5 Diffusion member (cover)
d1 The distance in the optical axis direction of the LED out of the distance from the center of the light emitting part of the LED to the incident surface d2 The distance in the central part direction of the instrument body r The distance in the outer peripheral direction of the instrument body

Claims (4)

器具本体と、前記器具本体の中央部を中心とする環状に配された複数のLEDと、前記LEDの光出射方向に設けられて該LEDから出射した光の配光を制御する光学部材と、を備え、
前記光学部材は、前記LEDの発光部を覆い該LEDから出射した光が入射するドーム状の入射面と、前記入射面から入射した光が伝搬する媒質部と、前記媒質部を伝搬した光が出射する出射面と、を有し、
前記入射面は、前記LEDの発光部の中心から前記入射面までの距離のうち、前記LEDの光軸方向の距離rと、前記器具本体の中央部方向の距離d1と、前記器具本体の外周方向の距離d2と、のうち距離r及び距離d2が、r/d2<1を満たし、
前記媒質部は、前記LEDの光軸方向よりも前記器具本体の外周方向における肉厚が前記LEDの光軸方向よりも前記器具本体の中央部方向における肉厚よりも薄くなるように構成され、
前記出射面は、前記LEDの光軸方向よりも前記器具本体の中央部方向における断面形状が前記中央部方向に凸形状となるように構成されていることを特徴とする照明器具。
An instrument main body, a plurality of LEDs arranged in an annular shape centering on the central portion of the instrument main body, an optical member that is provided in the light emission direction of the LED and controls the light distribution of the light emitted from the LED, With
The optical member covers a light emitting portion of the LED, a dome-shaped incident surface on which light emitted from the LED is incident, a medium portion on which light incident from the incident surface propagates, and light propagated through the medium portion An exit surface for exiting,
Among the distances from the center of the light emitting portion of the LED to the incident surface, the incident surface is a distance r in the optical axis direction of the LED, a distance d1 in the central portion direction of the device body, and an outer periphery of the device body. The distance r in the direction and the distance r and the distance d2 satisfy r / d2 <1,
The medium portion is configured such that the thickness in the outer peripheral direction of the instrument body is thinner than the thickness in the central direction of the instrument body than the optical axis direction of the LED, than the optical axis direction of the LED.
The illuminating device is characterized in that the emission surface is configured such that a cross-sectional shape in the central portion direction of the device main body is convex in the central portion direction rather than the optical axis direction of the LED .
器具本体と、前記器具本体の中央部を中心とする環状に配された複数のLEDと、前記LEDの光出射方向に設けられて該LEDから出射した光の配光を制御する光学部材と、を備え、  An instrument main body, a plurality of LEDs arranged in an annular shape centering on the central portion of the instrument main body, an optical member that is provided in the light emission direction of the LED and controls the light distribution of the light emitted from the LED, With
前記光学部材は、前記LEDの発光部を覆い該LEDから出射した光が入射するドーム状の入射面と、前記入射面から入射した光が伝搬する媒質部と、前記媒質部を伝搬した光が出射する出射面と、を有し、  The optical member covers a light emitting portion of the LED, a dome-shaped incident surface on which light emitted from the LED is incident, a medium portion on which light incident from the incident surface propagates, and light propagated through the medium portion An exit surface for exiting,
前記入射面は、前記LEDの発光部の中心から前記入射面までの距離のうち、前記LEDの光軸方向の距離rと、前記器具本体の中央部方向の距離d1と、前記器具本体の外周方向の距離d2と、のうち距離r及び距離d1が、が、r/d1<1を満たし、  Among the distances from the center of the light emitting portion of the LED to the incident surface, the incident surface is a distance r in the optical axis direction of the LED, a distance d1 in the central portion direction of the device body, and an outer periphery of the device body. Of the distances d2 in the direction, the distance r and the distance d1 satisfy r / d1 <1,
前記媒質部は、前記LEDの光軸方向よりも前記器具本体の中央部方向における肉厚が前記LEDの光軸方向よりも前記器具本体の外周方向における肉厚よりも薄くなるように構成され、  The medium portion is configured such that the thickness in the central portion direction of the instrument body is smaller than the thickness in the outer peripheral direction of the instrument body than the optical axis direction of the LED, rather than the optical axis direction of the LED.
前記出射面は、前記LEDの光軸方向よりも前記器具本体の中央部方向における断面形状が略円形となるように構成されていることを特徴とする照明器具。  The illuminating device is characterized in that the emission surface is configured so that a cross-sectional shape in a central portion direction of the device body is substantially circular rather than an optical axis direction of the LED.
前記光学部材からの光出射方向に設けられて該光学部材から出射する光を拡散させて放射する拡散部材を更に備え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 , further comprising a diffusion member that is provided in a light emission direction from the optical member and diffuses and emits light emitted from the optical member . 前記拡散部材は、光放射方向に凸形状又は凹形状であり、且つその中央部が平坦となるように形成されていることを特徴とする請求項3に記載の照明器具。 The illuminating device according to claim 3 , wherein the diffusing member has a convex shape or a concave shape in a light emission direction, and is formed so that a central portion thereof is flat .
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