JP2014056694A - Lighting apparatus - Google Patents

Lighting apparatus Download PDF

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JP2014056694A
JP2014056694A JP2012200486A JP2012200486A JP2014056694A JP 2014056694 A JP2014056694 A JP 2014056694A JP 2012200486 A JP2012200486 A JP 2012200486A JP 2012200486 A JP2012200486 A JP 2012200486A JP 2014056694 A JP2014056694 A JP 2014056694A
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light
light source
light guide
central
planar
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JP5967574B2 (en
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Hiroyuki Sekii
広行 関井
Tetsuya Nishi
哲也 西
Kyohei Nakamura
恭平 中村
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Panasonic Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a lighting apparatus whose light source is an LED which enhances luminance in a central position of the apparatus, and which acquires desired desk-top illuminance in a front position of the apparatus.SOLUTION: A lighting apparatus 1 includes: a linear light source 2 arranged along an outer periphery of the apparatus and having an LED 21; and a planar light guide 3 guiding light emitted from the linear light source 2 to the central direction of the apparatus and deriving it to the outside. Also, the lighting apparatus 1, at the central position of the planar light guide 3, includes: a central light source 4 having an LED 41 in which a light axis Ax is set in the direction orthogonal to the light guiding direction; and a condenser lens 5 which condenses light from the central light source 4 into the direction of the light axis Ax. Not only the light from the linear light source 2 arranged along the outer periphery of the apparatus is radiated to the outside via the planar light guide 3, but also the light from the central light source 4 arranged at the central position of the apparatus is condensed by the condenser lens 5 and radiated in the front face direction of the apparatus. Thereby, luminance of the central position of the apparatus can be enhanced, and desired desk-top illuminance can be acquired in the front position of the apparatus.

Description

本発明は、ＬＥＤ及びこのＬＥＤからの光を導光する面状導光体を備えた照明器具に関する。   The present invention relates to an illumination fixture including an LED and a planar light guide that guides light from the LED.

従来から、住宅等の天井に取り付けられる照明器具として、ＬＥＤを光源とする面光源の姿態で構成されたものが知られている（例えば、特許文献１参照）。図５及び図６に示すように、このような照明器具１０は、複数のＬＥＤ２１０を有する複数の光源２０と、これら光源２０から出射された光を導光しつつ外部に導出する面状導光体３０と、を備える。複数の光源２０は、器具外周方向に光を出射するように器具中央位置に環状に配置され、面状導光体３０は、これら光源２０の周囲を囲むように配置されている。また、照明器具１０は、その光出射面に光を拡散する拡散パネル６０を備える。なお、図５では拡散パネル６０の図示を省略している。   DESCRIPTION OF RELATED ART Conventionally, what was comprised by the form of the surface light source which uses LED as a light source is known as a lighting fixture attached to ceilings, such as a house (for example, refer patent document 1). As shown in FIGS. 5 and 6, such a luminaire 10 includes a plurality of light sources 20 having a plurality of LEDs 210 and a planar light guide that guides light emitted from these light sources 20 to the outside. A body 30. The plurality of light sources 20 are annularly arranged at the center position of the instrument so as to emit light in the outer peripheral direction of the instrument, and the planar light guide 30 is arranged so as to surround the light sources 20. Moreover, the lighting fixture 10 is provided with the diffusion panel 60 which diffuses light on the light-projection surface. In addition, illustration of the diffusion panel 60 is abbreviate | omitted in FIG.

各々の光源２０から出射された光Ｌ（図６の拡大図において実線矢印で示す）は、面状導光体３０の内部において全反射を繰り返しながら器具外周方向に向けて導光される。この際、光Ｌの一部は、面状導光体３０に設けられた拡散構造３５０により種々の方向に拡散され、拡散パネル６０の方向に拡散された拡散光Ｓ１０（破線矢印で示す）や、拡散パネル６０とは反対側の方向に拡散された拡散光Ｓ２０（一点鎖線矢印で示す）となる。拡散光Ｓ１０は、拡散パネル６０により更に拡散されてから器具外部へ照射される。拡散光Ｓ２０は、拡散構造３５０上に設けられた反射シート３６０により面状導光体３０の方向に反射された後、拡散光Ｓ１０と同様の経路をたどって器具外部へ照射される。   Light L emitted from each light source 20 (indicated by a solid arrow in the enlarged view of FIG. 6) is guided toward the outer periphery of the instrument while repeating total reflection inside the planar light guide 30. At this time, a part of the light L is diffused in various directions by the diffusion structure 350 provided on the planar light guide 30 and diffused in the direction of the diffusion panel 60 (indicated by broken arrows) or The diffused light S20 is diffused in the direction opposite to the diffusion panel 60 (indicated by a one-dot chain line arrow). The diffused light S10 is further diffused by the diffusion panel 60 and then irradiated to the outside of the instrument. The diffused light S20 is reflected in the direction of the planar light guide 30 by the reflection sheet 360 provided on the diffusing structure 350, and then irradiated to the outside of the instrument through the same path as the diffused light S10.

特開２０１１−２２２４２０号公報JP 2011-222420 A

しかしながら、上述したような照明器具１０では、環状に配置された光源２０が器具外周方向に光を出射するので、光源２０よりも内側の器具中央位置における輝度が低くなり、器具正面位置において所望の机上面照度を得ることができない。   However, in the lighting fixture 10 as described above, since the annularly arranged light source 20 emits light in the outer peripheral direction of the fixture, the luminance at the fixture central position inside the light source 20 is lowered, and a desired luminance is obtained at the fixture front position. Unable to get desk top illumination.

本発明は、上記課題を解決するものであって、ＬＥＤを光源とする照明器具において器具中央位置における輝度が高く、器具正面位置において所望の机上面照度を得ることができる照明器具を提供することを目的とする。   The present invention solves the above-described problem, and provides a lighting fixture that has high brightness at the center position of a fixture in a lighting fixture that uses LEDs as a light source, and can obtain a desired desk surface illuminance at the front position of the fixture. With the goal.

本発明の照明器具は、線状に配置された複数のＬＥＤを有する線光源及びこの線光源から出射された光を導光しつつ外部に導出する面状導光体を備え、前記線光源は、前記面状導光体の外周に沿って配置され、該面状導光体に向けて光を出射し、前記面状導光体は、その外周に設けられ前記線光源からの光を導入するための導入面と、前記導入面から導入された光を器具中央方向に導光しつつ外部に導出するための導出面と、を有し、前記面状導光体の中央位置に、前記線光源から出射された光の導光方向と直交する方向に光軸が設定されたＬＥＤを有する中央光源と、前記中央光源からの光を前記光軸方向に集光する集光レンズと、を更に備えることを特徴とする。   The luminaire of the present invention includes a linear light source having a plurality of LEDs arranged in a linear manner and a planar light guide that guides light emitted from the linear light source to the outside, and the linear light source includes: The light guide is disposed along the outer periphery of the planar light guide, emits light toward the planar light guide, and the planar light guide is provided on the outer periphery to introduce light from the line light source. And a lead-out surface for guiding the light introduced from the lead-in surface to the outside while guiding the light introduced from the lead-in surface toward the center of the instrument. A central light source having an LED whose optical axis is set in a direction orthogonal to the light guide direction of light emitted from the linear light source, and a condensing lens that condenses the light from the central light source in the optical axis direction. It is further provided with the feature.

前記集光レンズは、前記中央光源から出射された光が入射する入射面と、前記入射面に対向して設けられ該入射面から入射した光が出射する出射面と、前記入射面及び出射面を連結する側面と、を有し、前記入射面が、フレネル構造を有することが好ましい。   The condenser lens includes an incident surface on which light emitted from the central light source is incident, an output surface that is provided opposite to the incident surface and emits light incident from the incident surface, and the incident surface and the output surface. It is preferable that the incident surface has a Fresnel structure.

前記面状導光体は、その中央に前記線光源からの光を前記集光レンズの側面に導入するための連結面を有することが好ましい。   It is preferable that the planar light guide has a connecting surface for introducing light from the line light source to the side surface of the condenser lens at the center thereof.

本照明器具は、前記面状導光体の中央位置に、自身を天井に取り付けるための器具側取付構造を更に備え、前記集光レンズは、面状導光体に対して着脱可能とされていることが好ましい。   The lighting fixture further includes a fixture-side mounting structure for attaching the lighting fixture to a ceiling at a central position of the planar light guide, and the condenser lens is detachable from the planar light guide. Preferably it is.

本発明によれば、器具外周に沿って配置された線光源からの光が面状導光体を介して外部に照射されるだけでなく、器具中央位置に配置された中央光源からの光が集光レンズにより集光されて器具正面方向に照射される。そのため、器具中央位置の輝度を高めることができ、また、器具正面位置において所望の机上面照度を得ることができる。   According to the present invention, the light from the line light source disposed along the outer periphery of the instrument is not only irradiated to the outside via the planar light guide, but also the light from the central light source disposed at the instrument central position. The light is condensed by the condenser lens and irradiated in the front direction of the instrument. Therefore, the brightness | luminance of an instrument center position can be raised and desired desk surface illumination intensity can be obtained in an instrument front position.

本発明の実施形態に係る照明器具を光照射面側から見た図。The figure which looked at the lighting fixture which concerns on embodiment of this invention from the light irradiation surface side. （ａ）は図１のＩ−Ｉ線断面図、（ｂ）は（ａ）に示した領域Ａの拡大図、（ｃ）は（ａ）に示した領域Ｂの拡大図。(A) is the II sectional view taken on the line of FIG. 1, (b) is the enlarged view of the area | region A shown to (a), (c) is the enlarged view of the area | region B shown to (a). 上記実施形態の第１の変形例に係る照明器具の断面図及びその一部拡大図。Sectional drawing of the lighting fixture which concerns on the 1st modification of the said embodiment, and its partial enlarged view. 上記実施形態の第２の変形例に係る照明器具の断面図。Sectional drawing of the lighting fixture which concerns on the 2nd modification of the said embodiment. 従来の照明器具を光照射面側から見た図。The figure which looked at the conventional lighting fixture from the light irradiation surface side. 図５のＩ−Ｉ線断面図及びその一部拡大図。FIG. 6 is a cross-sectional view taken along the line II of FIG. 5 and a partially enlarged view thereof.

本発明の実施形態に係る照明器具について、図１及び図２を参照して説明する。照明器具１は、住宅等の天井Ｃに取り付けられる面状のシーリングライトである。なお、図１では、後述する拡散パネルの図示を省略している。   The lighting fixture which concerns on embodiment of this invention is demonstrated with reference to FIG.1 and FIG.2. The luminaire 1 is a planar ceiling light that is attached to a ceiling C of a house or the like. In FIG. 1, the illustration of a diffusion panel described later is omitted.

照明器具１は、線状に配置された複数のＬＥＤ２１を有する複数の線光源２と、これら線光源２から出射された光を導光しつつ外部に導出する面状導光体３と、を備える。図例では、面状導光体３は、平面視で八角形状とされ、線光源２は、面状導光体３の各々の辺（外周）に沿って配置されている。各々の線光源２において、複数のＬＥＤ２１は、互いに等間隔を置いて配置され、それぞれ面状導光体３に向けて光を出射する。面状導光体３は、その各辺に設けられ線光源２からの光を導入するための導入面３１と、導入面３１から導入された光を器具中央方向に導光しつつ外部に導出するための導出面３２と、を有する。また、面状導光体３は、その中央に線光源２からの光を後述する集光レンズに導入するための連結面３３を有する。連結面３３は、平面視で八角形状とされ、その頂点部３３ａは、丸みを帯びた形状とされている（図１の拡大図参照）。   The luminaire 1 includes a plurality of line light sources 2 having a plurality of LEDs 21 arranged in a line, and a planar light guide 3 that guides light emitted from the line light sources 2 and guides the light to the outside. Prepare. In the illustrated example, the planar light guide 3 has an octagonal shape in plan view, and the line light source 2 is disposed along each side (outer periphery) of the planar light guide 3. In each line light source 2, the plurality of LEDs 21 are arranged at equal intervals from each other, and each emits light toward the planar light guide 3. The planar light guide 3 is provided on each side of the light guide 3 for introducing light from the line light source 2, and guides the light introduced from the introduction surface 31 in the direction of the center of the instrument. And a lead-out surface 32. Moreover, the planar light guide 3 has a connecting surface 33 for introducing light from the line light source 2 into a condensing lens described later at the center thereof. The connecting surface 33 has an octagonal shape in plan view, and its apex portion 33a has a rounded shape (see the enlarged view of FIG. 1).

また、照明器具１は、面状導光体３の中央位置に、線光源２から出射された光の導光方向と直交する方向に光軸Ａｘが設定されたＬＥＤ４１を有する中央光源４と、この中央光源４からの光を光軸Ａｘ方向に集光する集光レンズ５と、を備える。ＬＥＤ４１は、線光源２のＬＥＤ２１とは独立に点灯制御される。集光レンズ５は、中央光源４側が小径となった逆円錐台形状とされ、中央光源４側の面に中央光源４を収容する凹部５１を有する（図２（ｃ）参照）。凹部５１は、中央光源４に相対して設けられ中央光源４から出射された光が入射する第１の入射面５２と、凹部５１の側面を構成して中央光源４から出射された光が入射する第２の入射面５３と、を有する。また、集光レンズ５は、第１の入射面５２に対向して設けられ第１の入射面５２及び第２の入射面５３から入射した光が出射する出射面５４と、第２の入射面５３及び出射面５４を連結する側面５５と、有する。側面５５は、第２の入射面５３に入射した光を出射面５４方向に全反射する。   In addition, the luminaire 1 includes a central light source 4 having an LED 41 with an optical axis Ax set in a direction orthogonal to the light guide direction of the light emitted from the linear light source 2 at the central position of the planar light guide 3; A condenser lens 5 that condenses the light from the central light source 4 in the direction of the optical axis Ax. The LED 41 is controlled to be turned on independently of the LED 21 of the linear light source 2. The condensing lens 5 is in the shape of an inverted truncated cone having a small diameter on the central light source 4 side, and has a recess 51 for accommodating the central light source 4 on the surface on the central light source 4 side (see FIG. 2C). The concave portion 51 is provided so as to be opposed to the central light source 4. The first incident surface 52 on which the light emitted from the central light source 4 enters, and the light emitted from the central light source 4 constituting the side surface of the concave portion 51 is incident. And a second incident surface 53. The condensing lens 5 is provided opposite to the first incident surface 52, an output surface 54 from which light incident from the first incident surface 52 and the second incident surface 53 is emitted, and a second incident surface. 53 and a side surface 55 connecting the emission surface 54. The side surface 55 totally reflects the light incident on the second incident surface 53 in the direction of the exit surface 54.

集光レンズ５は、その側面５５が面状導光体３の連結面３３と隣接するように配置されている。これにより、線光源２から出射されて面状導光体３により導光されてきた光は、面状導光体３の連結面３３から導出された後、側面５５から集光レンズ５に導入される。   The condensing lens 5 is disposed such that its side surface 55 is adjacent to the connecting surface 33 of the planar light guide 3. Thereby, the light emitted from the linear light source 2 and guided by the planar light guide 3 is led out from the connecting surface 33 of the planar light guide 3 and then introduced from the side surface 55 to the condenser lens 5. Is done.

また、照明器具１は、面状導光体３の導出面３２に相対して設けられ光を拡散する拡散パネル６と、拡散パネル６を保持すると共に上述した線光源２、面状導光体３、中央光源４及び集光レンズ５を収容する筐体７と、を備える。筐体７は、線光源２を保持する保持構造７１を有し、樹脂や金属により構成される。また、筐体７の天井Ｃと相対する面の中央位置には、照明器具１を天井Ｃに取り付けるための器具側取付構造８が設けられている。   The luminaire 1 also has a diffusion panel 6 that is provided relative to the lead-out surface 32 of the planar light guide 3 and diffuses light, and holds the diffusion panel 6 and the above-described line light source 2 and planar light guide. 3, and a housing 7 that houses the central light source 4 and the condenser lens 5. The housing 7 has a holding structure 71 that holds the line light source 2 and is made of resin or metal. In addition, a fixture-side mounting structure 8 for mounting the lighting fixture 1 to the ceiling C is provided at the center position of the surface of the housing 7 facing the ceiling C.

器具側取付構造８は、天井Ｃに設けられた天井側取付構造９に取り付けられる。天井側取付構造９は、商用電源に接続された端子受け部（不図示）を有し、この端子受け部に器具側取付構造８に設けられた電極端子（不図示）が係合することで、天井側取付構造９と器具側取付構造８とが機械的及び電気的に接続される。また、器具側取付構造８は、商用電源からＬＥＤ２１、４１への電力供給を調整することで、これらＬＥＤ２１、４１を互いに独立にオンオフ制御及び調光制御する制御回路（不図示）を有する。   The appliance side attachment structure 8 is attached to a ceiling side attachment structure 9 provided on the ceiling C. The ceiling side mounting structure 9 has a terminal receiving portion (not shown) connected to a commercial power source, and an electrode terminal (not shown) provided in the appliance side mounting structure 8 is engaged with the terminal receiving portion. The ceiling side mounting structure 9 and the appliance side mounting structure 8 are mechanically and electrically connected. Moreover, the appliance side attachment structure 8 has a control circuit (not shown) that performs on / off control and dimming control of the LEDs 21 and 41 independently of each other by adjusting power supply from the commercial power source to the LEDs 21 and 41.

各々の線光源２のＬＥＤ２１は、それぞれ白色光を発する白色ＬＥＤにより構成されている。これらＬＥＤ２１は、配線基板２２上に実装され、配線基板２２は、配電線（不図示）を介して器具側取付構造８の制御回路に接続されている。中央光源４のＬＥＤ４１も、ＬＥＤ２１と同様に白色ＬＥＤにより構成されている。ＬＥＤ４１は、器具側取付構造８上に設けられた配線基板４２上に実装されており、配線基板４２は、器具側取付構造８の制御回路と接続されている。   The LED 21 of each line light source 2 is composed of a white LED that emits white light. These LEDs 21 are mounted on a wiring board 22, and the wiring board 22 is connected to a control circuit of the appliance side mounting structure 8 via a distribution line (not shown). Similarly to the LED 21, the LED 41 of the central light source 4 is also composed of a white LED. The LED 41 is mounted on a wiring board 42 provided on the instrument side mounting structure 8, and the wiring board 42 is connected to a control circuit of the instrument side mounting structure 8.

導光板３は、透光性材料により構成され、図示しない保持構造によって筐体７に保持されている。導光体３を構成する材料は、例えば、アクリル樹脂、ポリカーボネート樹脂、又はガラスであり、この中でもコスト及び導光効率の観点からアクリル樹脂が特に好ましい。導光板３は、その導出面３２とは反対側の面３４に形成され光を拡散する拡散構造３５と、拡散構造３５上に設けられ光を反射する反射シート３６と、を有する。拡散構造３５は、例えば、微細プリズム加工、シルク印刷、又はレーザードット加工により形成される。拡散構造３５の密度は、線光源２に近い器具外周領域では低く、線光源２から離れた器具中央領域では高くなるように構成されている。反射シート３６は、高い光反射率及び光拡散性を有する薄いシートにより構成されている。   The light guide plate 3 is made of a translucent material and is held in the housing 7 by a holding structure (not shown). The material which comprises the light guide 3 is an acrylic resin, a polycarbonate resin, or glass, for example, Among these, an acrylic resin is especially preferable from a viewpoint of cost and light guide efficiency. The light guide plate 3 includes a diffusion structure 35 that is formed on a surface 34 opposite to the lead-out surface 32 and diffuses light, and a reflection sheet 36 that is provided on the diffusion structure 35 and reflects light. The diffusion structure 35 is formed by, for example, fine prism processing, silk printing, or laser dot processing. The density of the diffusing structure 35 is configured so as to be low in the instrument outer peripheral region close to the line light source 2 and high in the instrument central region far from the line light source 2. The reflection sheet 36 is composed of a thin sheet having high light reflectance and light diffusibility.

拡散パネル６は、透光性材料、例えば、アクリル樹脂やポリカーボネート樹脂により構成される。拡散パネル６には、酸化チタンや炭酸カルシウム等をベースにした粒子から成る光拡散材が分散されている。拡散パネル６は、導光板３から導出された光及び集光レンズ５から出射した光を種々の方向に拡散することで照射光の輝度むらを低減する。   The diffusion panel 6 is made of a translucent material such as an acrylic resin or a polycarbonate resin. In the diffusing panel 6, a light diffusing material made of particles based on titanium oxide, calcium carbonate, or the like is dispersed. The diffusion panel 6 reduces unevenness in luminance of the irradiated light by diffusing light derived from the light guide plate 3 and light emitted from the condenser lens 5 in various directions.

上記のように構成された照明器具１において、図２（ｂ）に示すように、線光源２のＬＥＤ２１から出射された光Ｌ１（実線矢印で示す）は、面状導光体３の導入面３１から面状導光体３に導入される。その後、光Ｌ１は、面状導光体３の内部で全反射を繰り返しながら器具中央方向へ導光される。このとき、面状導光体３の面３４に達した光Ｌ１の一部は、拡散構造３５により種々の方向に拡散され、拡散パネル６の方向に拡散される拡散光Ｓ１（破線で示す）や、反射シート３６の方向に拡散される拡散光Ｓ２（一点鎖線矢印で示す）となる。拡散光Ｓ１は、面状導光体３の導出面３２から導出された後、拡散パネル６によって更に拡散されてから照明器具１の外部へ照射される。拡散光Ｓ２は、反射シート３６により反射されて再び面状導光体３に入射し、その後、拡散光Ｓ１と同様の経路をたどって照明器具１の外部へ照射される。   In the luminaire 1 configured as described above, as shown in FIG. 2B, the light L1 emitted from the LED 21 of the line light source 2 (indicated by the solid line arrow) is the introduction surface of the planar light guide 3. 31 is introduced into the planar light guide 3. Thereafter, the light L <b> 1 is guided toward the instrument center while repeating total reflection inside the planar light guide 3. At this time, part of the light L1 reaching the surface 34 of the planar light guide 3 is diffused in various directions by the diffusion structure 35 and diffused in the direction of the diffusion panel 6 (indicated by a broken line). Or it becomes the diffused light S2 (indicated by a one-dot chain line arrow) diffused in the direction of the reflection sheet 36. The diffused light S <b> 1 is led out from the lead-out surface 32 of the planar light guide 3, and then further diffused by the diffusion panel 6 before being irradiated to the outside of the lighting fixture 1. The diffused light S2 is reflected by the reflection sheet 36 and enters the planar light guide 3 again, and then is irradiated to the outside of the lighting fixture 1 along the same path as the diffused light S1.

図２（ｃ）に示すように、光Ｌ１の一部（実線矢印で示す）は、面状導光体３の連結面３３から導出されて、集光レンズ５の側面５５から集光レンズ５に入射する。このような光Ｌ１及び中央光源４のＬＥＤ４１から出射されて集光レンズ５に入射した光Ｌ２（破線矢印で示す）は、集光レンズ５により光軸Ａｘ方向に集光されて、照明器具１の中央位置から器具正面（器具直下）方向に照射される。   As shown in FIG. 2C, a part of the light L <b> 1 (indicated by a solid line arrow) is led out from the connection surface 33 of the planar light guide 3 and from the side surface 55 of the condenser lens 5. Is incident on. Such light L1 and light L2 emitted from the LED 41 of the central light source 4 and incident on the condenser lens 5 (indicated by broken line arrows) are condensed in the direction of the optical axis Ax by the condenser lens 5, and the luminaire 1 Irradiated from the center position of the instrument in the direction of the instrument front (directly below the instrument).

本実施形態の照明器具１によれば、器具外周に沿って配置された線光源２からの光が面状導光体３を介して外部に照射されるだけでなく、器具中央位置に配置された中央光源４からの光が集光レンズ５により集光されて器具直下方向に照射される。そのため、器具中央位置の輝度を高めることができ、また、器具直下位置において所望の机上面照度を得ることができる。   According to the lighting fixture 1 of the present embodiment, the light from the line light source 2 arranged along the outer periphery of the fixture is not only irradiated to the outside via the planar light guide 3, but also arranged at the central position of the fixture. The light from the central light source 4 is collected by the condenser lens 5 and irradiated in the direction directly below the instrument. Therefore, the brightness | luminance of an instrument center position can be raised and desired desk surface illumination intensity can be obtained in the instrument direct position.

また、線光源２及び中央光源４の両方を点灯すれば、照射空間全体を照らして明るさ感を確保でき、中央光源４のみを点灯すれば、集光レンズ５により集光されたスポットライトのような光を照射でき、シーンに応じて照射光パターンを使い分けることができる。   Further, if both the line light source 2 and the central light source 4 are turned on, a feeling of brightness can be ensured by illuminating the entire irradiation space, and if only the central light source 4 is turned on, the spotlights condensed by the condenser lens 5 can be secured. Such light can be irradiated, and the irradiation light pattern can be properly used according to the scene.

また、拡散構造３５の密度が、器具外周領域では低く、器具中央領域では高くなっているので、ＬＥＤ２１に近くて光量の高い器具外周領域では光Ｌ１が主に器具中央方向に導光され、光量が低くなりがちな器具中央領域では光Ｌ１が主に拡散される。これにより、器具外周領域に比べて、器具中央領域において照明器具１から照射される光の割合を増やすことができるので、器具中央領域における照射光輝度を向上して照射光の輝度均斉度を高めることができる。また、拡散構造３５により拡散されて拡散パネル６とは反対側に向かう光を反射シート３６により反射して再び拡散パネル６の方向に向かわせることができるので、照明光に寄与しない光が低減されて照明効率が向上する。   Further, since the density of the diffusing structure 35 is low in the peripheral area of the instrument and high in the central area of the instrument, the light L1 is mainly guided in the central direction of the instrument in the peripheral area of the instrument that is close to the LED 21 and has a high light amount The light L1 is mainly diffused in the central region of the instrument that tends to be low. Thereby, since the ratio of the light irradiated from the lighting fixture 1 in the fixture central region can be increased compared with the fixture outer peripheral region, the emitted light luminance in the fixture central region is improved and the luminance uniformity of the irradiated light is increased. be able to. Further, the light diffused by the diffusing structure 35 and directed toward the opposite side of the diffusing panel 6 can be reflected by the reflecting sheet 36 and directed again toward the diffusing panel 6, so that the light that does not contribute to the illumination light is reduced. Lighting efficiency.

また、平面視で面状導光体３の連結面３３の頂点部３３ａが丸みを帯びた形状とされているので、面状導光体３から集光レンズ５に入射する光Ｌ１の急激な光線方向変化が抑制され、これにより、照明器具１から照射される光の輝度むらが低減される。   Further, since the apex portion 33a of the connecting surface 33 of the planar light guide 3 is rounded in plan view, the light L1 incident on the condenser lens 5 from the planar light guide 3 is abrupt. The change in the direction of the light beam is suppressed, thereby reducing the uneven brightness of the light emitted from the luminaire 1.

次に、上記実施形態の第１の変形例に係る照明器具について図３を参照して説明する。照明器具１１は、上述の照明器具１とは集光レンズ５の構造が異なり、照明器具１１の集光レンズ５は、中央光源４のＬＥＤ４１と相対する入射面５６にフレネル構造を有する。また、照明器具１１の集光レンズ５は、その側面５５が面状導光体３の連結面３３と融合した状態で、面状導光体３と一体成型されている。   Next, the lighting fixture which concerns on the 1st modification of the said embodiment is demonstrated with reference to FIG. The luminaire 11 is different from the luminaire 1 described above in the structure of the condenser lens 5, and the condenser lens 5 of the luminaire 11 has a Fresnel structure on the incident surface 56 facing the LED 41 of the central light source 4. The condensing lens 5 of the luminaire 11 is integrally formed with the planar light guide 3 in a state where the side surface 55 is fused with the connecting surface 33 of the planar light guide 3.

本変形例の照明器具１１によれば、入射面５６をフレネル構造としたので、集光レンズ５の光軸方向における厚みを薄くして、上述の照明器具１に比べて、器具を薄型化することができる。また、面状導光体３と集光レンズ５とが互いに一体成型されているので、照明器具１に比べて、部材点数を減らして組み立て効率を向上することができる。また、面状導光体３の連結面３３と集光レンズ５の側面５５とが互いに融合しているので、線光源２から出射され面状導光体３により導光されてきた光Ｌ１（図３の拡大図において実線矢印で示す）を、漏れなく確実に集光レンズ５に入射させることできる。これにより、照明器具１に比べて、照明効率を向上することができる。   According to the lighting fixture 11 of this modification, since the incident surface 56 has a Fresnel structure, the thickness of the condenser lens 5 in the optical axis direction is reduced, and the fixture is made thinner than the lighting fixture 1 described above. be able to. Moreover, since the planar light guide 3 and the condensing lens 5 are integrally formed with each other, the number of members can be reduced and the assembly efficiency can be improved as compared with the lighting fixture 1. Further, since the connecting surface 33 of the planar light guide 3 and the side surface 55 of the condenser lens 5 are fused with each other, the light L1 emitted from the linear light source 2 and guided by the planar light guide 3 ( 3 (indicated by a solid arrow in the enlarged view of FIG. 3) can be reliably incident on the condenser lens 5 without leakage. Thereby, compared with the lighting fixture 1, illumination efficiency can be improved.

次に、上記実施形態の第２の変形例に係る照明器具について図４を参照して説明する。照明器具１２は、上述の照明器具１１を基に、集光レンズ５を面状導光体３に対して着脱可能としたものである。本変形例の照明器具１２によれば、集光レンズ５を取り外せば直接に器具側取付構造８にアクセスすることが可能となるので、器具側取付構造８を天井側取付構造９に取り付ける操作がやり易くなって操作性が向上する。   Next, the lighting fixture which concerns on the 2nd modification of the said embodiment is demonstrated with reference to FIG. The lighting fixture 12 is configured such that the condenser lens 5 is detachable from the planar light guide 3 based on the lighting fixture 11 described above. According to the lighting fixture 12 of this modification, it is possible to directly access the fixture-side mounting structure 8 if the condenser lens 5 is removed, so that an operation for mounting the fixture-side mounting structure 8 to the ceiling-side mounting structure 9 is possible. It becomes easy to do and operability is improved.

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、面状導光体は、必ずしも連結面を有する必要はなく、線光源から出射され面状導光体により導光されてきた光が集光レンズに入射しない構成とされてもよい。また、線光源及び中央光源のＬＥＤは、白色ＬＥＤに限定されず、他色の光を出射するＬＥＤにより構成されていてもよい。また、線光源を構成するＬＥＤは１種類である必要はなく、例えば、昼白色の光を発するＬＥＤと電球色の光を発するＬＥＤとを交互に配置し、これら２種類のＬＥＤを互いに独立に点灯制御可能な構成としてもよい。   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, the planar light guide does not necessarily have a connection surface, and may be configured such that light emitted from a linear light source and guided by the planar light guide does not enter the condenser lens. Moreover, LED of a line light source and a center light source is not limited to white LED, You may be comprised by LED which radiate | emits the light of another color. Further, the LED constituting the line light source does not need to be one type. For example, LEDs that emit daylight white light and LEDs that emit light bulb color light are alternately arranged, and these two types of LEDs are independent of each other. It is good also as a structure in which lighting control is possible.

１、 １１、１２ 照明器具
２ 線光源
２１ （線光源の）ＬＥＤ
３ 面状導光体
３１ （面状導光体の）導入面
３２ （面状導光体の）導出面
３３ （面状導光体の）連結面
４ 中央光源
４１ （中央光源の）ＬＥＤ
５ 集光レンズ
５２ （集光レンズの第１の）入射面
５３ （集光レンズの第２の）入射面
５４ （集光レンズの）出射面
５５ （集光レンズの）側面
８ 器具側取付構造
Ａｘ 光軸
Ｃ 天井 1, 11, 12 Lighting fixture 2 Line light source 21 (Line light source) LED
3 planar light guide 31 (planar light guide) introduction surface 32 (planar light guide) lead-out surface 33 (planar light guide) connection surface 4 central light source 41 (central light source) LED
5 condensing lens 52 (first condensing lens) entrance surface 53 (condensing lens second) entrance surface 54 (condensing lens) exit surface 55 (condensing lens) side surface 8 instrument side mounting structure Ax Optical axis C Ceiling

Claims (4)

線状に配置された複数のＬＥＤを有する線光源及びこの線光源から出射された光を導光しつつ外部に導出する面状導光体を備えた照明器具であって、
前記線光源は、前記面状導光体の外周に沿って配置され、該面状導光体に向けて光を出射し、
前記面状導光体は、その外周に設けられ前記線光源からの光を導入するための導入面と、前記導入面から導入された光を器具中央方向に導光しつつ外部に導出するための導出面と、を有し、
前記面状導光体の中央位置に、前記線光源から出射された光の導光方向と直交する方向に光軸が設定されたＬＥＤを有する中央光源と、前記中央光源からの光を前記光軸方向に集光する集光レンズと、を更に備えることを特徴とする照明器具。 A lighting device comprising a linear light source having a plurality of LEDs arranged in a linear manner and a planar light guide that guides light emitted from the linear light source to the outside,
The line light source is disposed along the outer periphery of the planar light guide, emits light toward the planar light guide,
The planar light guide is provided on the outer periphery thereof for introducing light from the line light source, and for guiding the light introduced from the introduction surface to the outside while guiding the light toward the center of the instrument. A derivation surface of
A central light source having an LED in which an optical axis is set in a direction orthogonal to a light guide direction of the light emitted from the linear light source at a central position of the planar light guide, and light from the central light source is the light An illumination fixture, further comprising a condensing lens that condenses in the axial direction. 前記集光レンズは、前記中央光源から出射された光が入射する入射面と、前記入射面に対向して設けられ該入射面から入射した光が出射する出射面と、前記入射面及び出射面を連結する側面と、を有し、
前記入射面が、フレネル構造を有することを特徴とする請求項１に記載の照明器具。 The condenser lens includes an incident surface on which light emitted from the central light source is incident, an output surface that is provided opposite to the incident surface and emits light incident from the incident surface, and the incident surface and the output surface. And connecting side surfaces,
The lighting apparatus according to claim 1, wherein the incident surface has a Fresnel structure. 前記面状導光体は、その中央に前記線光源からの光を前記集光レンズの側面に導入するための連結面を有することを特徴とする請求項２に記載の照明器具。   The lighting apparatus according to claim 2, wherein the planar light guide has a connection surface for introducing light from the line light source to a side surface of the condenser lens at a center thereof. 前記面状導光体の中央位置に、自身を天井に取り付けるための器具側取付構造を更に備え、
前記集光レンズは、前記面状導光体に対して着脱可能とされていることを特徴とする請求項１乃至請求項３のいずれか一項に記載の照明器具。 In the center position of the planar light guide, further comprising a fixture side mounting structure for mounting itself to the ceiling,
The lighting apparatus according to any one of claims 1 to 3, wherein the condenser lens is detachable from the planar light guide.
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JPWO2016108278A1 (en) * 2014-12-28 2017-04-27 株式会社モデュレックス Lighting device
JP2018190515A (en) * 2017-04-28 2018-11-29 パナソニックＩｐマネジメント株式会社 Luminaire
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JP2012084316A (en) * 2010-10-08 2012-04-26 Toshiba Lighting & Technology Corp Lighting fixture
JP2013043539A (en) * 2011-08-24 2013-03-04 Fujikura Ltd Illuminating device

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JP2010205482A (en) * 2009-03-02 2010-09-16 Toshiba Lighting & Technology Corp Luminaire
JP2012084316A (en) * 2010-10-08 2012-04-26 Toshiba Lighting & Technology Corp Lighting fixture
JP2013043539A (en) * 2011-08-24 2013-03-04 Fujikura Ltd Illuminating device

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JPWO2016108278A1 (en) * 2014-12-28 2017-04-27 株式会社モデュレックス Lighting device
JP2018190515A (en) * 2017-04-28 2018-11-29 パナソニックＩｐマネジメント株式会社 Luminaire
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