JP5807165B2 - lighting equipment - Google Patents

lighting equipment Download PDF

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JP5807165B2
JP5807165B2 JP2011009799A JP2011009799A JP5807165B2 JP 5807165 B2 JP5807165 B2 JP 5807165B2 JP 2011009799 A JP2011009799 A JP 2011009799A JP 2011009799 A JP2011009799 A JP 2011009799A JP 5807165 B2 JP5807165 B2 JP 5807165B2
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light
light control
prism
light source
optical axis
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JP2012151030A (en
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恭平 中村
恭平 中村
村上　忠史
忠史 村上
関井　広行
広行 関井
友樹 白川
友樹 白川
哲也 西
哲也 西
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Description

本発明は、主に天井等に固定される照明器具に関するものである。   The present invention relates to a lighting fixture mainly fixed to a ceiling or the like.

従来、天井等に固定される照明器具としては、モジュール基板の表側の面に実装された複数の半導体発光素子と、モジュール基板の表側の面に積層された白色の拡散反射層と、半導体発光素子の照射（下）方向に設けられた照明カバーとを備えたものがある。（例えば、特許文献１参照）
このような照明器具では、半導体発光素子（光源）から水平方向より斜め上に出射された光が拡散反射層にて下方向に拡散反射されるため、照明カバーにおける輝度むらが低減される。言い換えると、照明器具（照明カバー）を見たとき、照明器具（照明カバー）における光源の真下の周り（光源の真下同士の間）が著しく暗く見えることが抑えられ、見栄えの悪化が抑えられる。 Conventionally, as a lighting fixture fixed to a ceiling or the like, a plurality of semiconductor light emitting elements mounted on the front side surface of the module substrate, a white diffuse reflection layer laminated on the front side surface of the module substrate, and a semiconductor light emitting element And an illumination cover provided in the irradiation (downward) direction. (For example, see Patent Document 1)
In such a luminaire, light emitted obliquely upward from the horizontal direction from the semiconductor light emitting element (light source) is diffusely reflected downward by the diffuse reflection layer, so that uneven brightness in the illumination cover is reduced. In other words, when the luminaire (lighting cover) is viewed, it is possible to suppress the area immediately below the light source (between the light sources) in the luminaire (lighting cover) from being remarkably dark, thereby suppressing deterioration in appearance.

特開２０１０−１７０９９０号公報JP 2010-170990 A

しかしながら、上記したような照明器具では、特に照明器具の下方の作業範囲を明るく照らす機能はなく、そのような配光特性を有しつつ見栄えの良い照明器具が望まれている。   However, the above-described luminaire does not have a function of brightly illuminating a working range below the luminaire, and a luminaire having a good appearance while having such a light distribution characteristic is desired.

本発明は、上記課題を解決するためになされたものであって、その目的は、簡単な構成で、照明器具の下方の作業範囲を明るく照らすことができるとともに、見栄えの良い照明器具を提供することにある。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a luminaire having a good appearance as well as capable of brightly illuminating a work range below the luminaire with a simple configuration. There is.

本発明の照明器具は、複数の光源と、前記光源の照射方向に設けられたプリズムとを備えた照明器具であって、前記プリズムの前記光源との対向側には、前記光源からの光の光軸を中心とした円形で凹凸を有する光制御面がそれぞれ設けられ、隣り合う光制御面同士は離間するように形成され、前記光制御面は、前記光源からの光を光軸に近づく方向に制御する集光面と、前記光源からの光を前記プリズムの前記照射方向側における前記光制御面との対向面よりも外側に到達させると共に自身と対向する前記対向面と隣り合う前記対向面との間に到達させるように制御する発散面とを有し、前記プリズムの前記照射方向側における前記対向面の外側を散乱透過面としたことを特徴とする。 The luminaire of the present invention is a luminaire including a plurality of light sources and a prism provided in an irradiation direction of the light source, and the light from the light source is disposed on the opposite side of the prism to the light source. Light control surfaces that are circular and have irregularities around the optical axis are provided, and adjacent light control surfaces are formed so as to be separated from each other, and the light control surface is a direction in which light from the light source approaches the optical axis The condensing surface to be controlled and the facing surface adjacent to the facing surface facing itself and causing light from the light source to reach the outer side of the light control surface on the irradiation direction side of the prism. possess a diverging surface that performs control so as to reach between, characterized in that the outer side of the facing surface in the irradiation direction side of the prism and a scattering transmitting surface.

この照明器具においては、前記光源と光源に対向する前記光制御面は、それぞれ３つ以上設けられ、隣り合う前記光制御面の中心間距離が全て等しくなるように配置されることが好ましい。   In this lighting fixture, it is preferable that three or more light control surfaces facing the light source and the light source are provided, and the distances between the centers of the adjacent light control surfaces are all equal.

この照明器具においては、前記光制御面は、前記光軸を中心とした環状で前記光源側に延びるほど径方向外側に延びる前記発散面と、前記光軸を中心とした環状で前記照射方向側に延びるほど径方向外側に延びる前記集光面とを有することが好ましい。 In luminaires this, the light control surface, said diverging surfaces in annular centering the optical axis extending in a radially outward as extending to the light source side, the irradiation direction in an annular centering the optical axis It is preferable to have the said condensing surface extended to radial direction outer side, so that it extends to the side.

本発明によれば、簡単な構成で、照明器具の下方の作業範囲を明るく照らすことができるとともに、見栄えの良い照明器具を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, while being able to illuminate the work range of the downward direction of a lighting fixture brightly by simple structure, the lighting fixture with good appearance can be provided.

（ａ）本実施形態における照明器具の概略構成を示す断面図。（ｂ）本実施の形態におけるプリズムのＬＥＤ素子との対向側の面を示す平面図。(A) Sectional drawing which shows schematic structure of the lighting fixture in this embodiment. (B) The top view which shows the surface on the opposite side to the LED element of the prism in this Embodiment. 本実施の形態における照明器具を説明するための一部拡大断面図。The partially expanded sectional view for demonstrating the lighting fixture in this Embodiment. 別例における照明器具を説明するための一部拡大断面図。The partially expanded sectional view for demonstrating the lighting fixture in another example. 別例における照明器具の概略構成を示す断面図。Sectional drawing which shows schematic structure of the lighting fixture in another example. 別例におけるプリズムのＬＥＤ素子との対向側の面を示す平面図。The top view which shows the surface on the opposite side to the LED element of the prism in another example.

以下、本発明を具体化した一実施の形態を図１及び図２に従って説明する。
図１（ａ）に示すように、天井等に固定される本実施の形態の照明器具１は、天井等に固定される基台２と、基台２に固定される光源としての複数（本実施の形態では３つ）のＬＥＤ素子３と、基台２に固定されるプリズム４とを備える。 Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1A, the lighting fixture 1 of the present embodiment fixed to a ceiling or the like includes a base 2 fixed to the ceiling or the like, and a plurality of (books) as light sources fixed to the base 2. In the embodiment, three LED elements 3 and a prism 4 fixed to the base 2 are provided.

複数のＬＥＤ素子３は、それぞれの発光面が下方を向くように設けられるとともに、一直線上に等間隔に並設されている。
プリズム４は、例えば透明なアクリル樹脂やガラスや石英ガラスやポリカーボネート樹脂やポリスチレン樹脂やシリコーン樹脂等からなる。そして、プリズム４は、ＬＥＤ素子３の照射方向（即ち下方）に配置されるように、言い換えると下方から見てＬＥＤ素子３を含む面を覆うように形成されて基台２に固定される。 The plurality of LED elements 3 are provided so that the respective light emitting surfaces face downward, and are arranged in parallel on the straight line at equal intervals.
The prism 4 is made of, for example, transparent acrylic resin, glass, quartz glass, polycarbonate resin, polystyrene resin, silicone resin, or the like. The prism 4 is formed and fixed to the base 2 so as to cover the surface including the LED element 3 as viewed from below so as to be arranged in the irradiation direction (that is, downward) of the LED element 3.

このプリズム４のＬＥＤ素子３との対向側には、図１（ｂ）に示すように、ＬＥＤ素子３からの光の光軸Ｌ１を中心とした円形で凹凸を有する光制御面４ａが形成されている。尚、本実施の形態では、ＬＥＤ素子３の数が３つであるため、光制御面４ａも３つ形成されている。又、３つのＬＥＤ素子３が等間隔に並設されていることから、隣り合う光制御面４ａにおいても中心間距離（即ち図１（ｂ）中、隣り合う光軸Ｌ１間の距離と同じ）が全て等しくなるように配置されている。又、プリズム４のＬＥＤ素子３との対向側において光制御面４ａ以外の部分、及びプリズム４の照射方向側（下側）の全面は平坦面とされている。   On the opposite side of the prism 4 to the LED element 3, as shown in FIG. 1B, a light control surface 4a having a circular shape with the optical axis L1 of light from the LED element 3 as a center is formed. ing. In the present embodiment, since the number of LED elements 3 is three, three light control surfaces 4a are also formed. In addition, since the three LED elements 3 are arranged at equal intervals, the distance between the centers of the adjacent light control surfaces 4a (that is, the same as the distance between the adjacent optical axes L1 in FIG. 1B). Are all equal. Further, on the side facing the LED element 3 of the prism 4, the portion other than the light control surface 4 a and the entire irradiation direction side (lower side) of the prism 4 are flat surfaces.

各光制御面４ａは、ＬＥＤ素子３からの光を光軸Ｌ１に近づく方向に制御する集光面（凸レンズ集光面４ｂ及び環状集光面４ｃ）と、同光をプリズム４の照射方向側における光制御面４ａとの対向面よりも外側に到達させるように制御する発散面４ｄとを有する。   Each light control surface 4a has a condensing surface (convex lens condensing surface 4b and annular condensing surface 4c) that controls the light from the LED element 3 in a direction approaching the optical axis L1, and the irradiation direction side of the prism 4 with the same light. And a diverging surface 4d that is controlled so as to reach the outside of the surface facing the light control surface 4a.

詳しくは、本実施の形態の光制御面４ａは、図１（ｂ）及び図２に示すように、前記光軸Ｌ１を中心とした円形でＬＥＤ素子３側に凸の球面形状である凸レンズ集光面４ｂを有する。凸レンズ集光面４ｂは、図２に示すように、ＬＥＤ素子３からの光Ａ１を光軸Ｌ１に近づく方向に制御する（光Ｂ１とする）。尚、図２では、視覚的に見やすくするためにプリズム４のハッチングを省略している。   Specifically, as shown in FIGS. 1B and 2, the light control surface 4a of the present embodiment is a convex lens assembly having a circular shape centering on the optical axis L1 and a spherical shape convex toward the LED element 3 side. It has a light surface 4b. As shown in FIG. 2, the convex lens condensing surface 4b controls the light A1 from the LED element 3 in a direction approaching the optical axis L1 (referred to as light B1). In FIG. 2, the prism 4 is not hatched for easy viewing.

又、光制御面４ａは、凸レンズ集光面４ｂの外側に形成され、前記光軸Ｌ１を中心とした環状でＬＥＤ素子３側（上側）に延びるほど径方向外側に延びる発散面４ｄを有する。本実施の形態の発散面４ｄは、断面が（光軸Ｌ１に対して若干）傾斜した傾斜面とされている。発散面４ｄは、図２に示すように、ＬＥＤ素子３からの光Ａ２〜Ａ４をプリズム４の照射方向側における光制御面４ａとの対向面（光軸Ｌ１方向から見て光制御面４ａの最外周）よりも外側に到達させるように制御する（光Ｂ２〜Ｂ４とする）。更に詳しくは、発散面４ｄは、前記ＬＥＤ素子３からの光Ａ２〜Ａ４を自身と対向する前記対向面（光制御面４ａとの対向面）と隣り合う前記対向面（隣り合う光制御面４ａの対向面）との間Ｚに到達させるように制御する。   The light control surface 4a is formed on the outer side of the convex lens condensing surface 4b, and has a diverging surface 4d that is annular with the optical axis L1 as a center and extends radially outward as it extends toward the LED element 3 (upper side). The diverging surface 4d of the present embodiment is an inclined surface whose cross section is inclined (slightly with respect to the optical axis L1). As shown in FIG. 2, the divergence surface 4d is a surface facing the light control surface 4a on the irradiation direction side of the prism 4 (light of the light control surface 4a when viewed from the optical axis L1 direction). Control is performed so as to reach the outer side of the outermost periphery (lights B2 to B4). More specifically, the diverging surface 4d is formed by the facing surface (adjacent light control surface 4a) adjacent to the facing surface (facing surface with the light control surface 4a) facing the light A2 to A4 from the LED element 3 itself. Control to reach Z with respect to the opposite surface).

又、光制御面４ａは、前記発散面４ｄの外側に形成され、前記光軸Ｌ１を中心とした環状で照射方向側（下側）に延びるほど径方向外側に延びる環状集光面４ｃを有する。本実施の形態の環状集光面４ｃは、断面が弧状に形成され、詳しくは、前記凸レンズ集光面４ｂとで大きな凸レンズを構成するように、即ち、所謂フレネルレンズと略同様の構成となるように形成されている。尚、本実施の形態のプリズム４は、ＬＥＤ素子３側に延びるほど径方向外側に延びる発散面４ｄを有するため、凸レンズ集光面４ｂと環状集光面４ｃとが前記光軸Ｌ１と直交する方向に連続せず（僅かな隙間を有し）公知のフレネルレンズとは若干異なっている。そして、環状集光面４ｃは、図２に示すように、ＬＥＤ素子３からの光Ａ５を光軸Ｌ１に近づく方向に制御する（光Ｂ５とする）。又、本実施の形態の光制御面４ａは、発散面４ｄと環状集光面４ｃとを径方向に交互に３つずつ有している。   The light control surface 4a is formed outside the diverging surface 4d, and has an annular condensing surface 4c that is annular around the optical axis L1 and extends radially outward as it extends toward the irradiation direction (downward). . The annular condensing surface 4c of the present embodiment has an arc-shaped cross section. Specifically, the annular condensing surface 4c forms a large convex lens with the convex lens condensing surface 4b, that is, has substantially the same configuration as a so-called Fresnel lens. It is formed as follows. The prism 4 of the present embodiment has a diverging surface 4d that extends radially outward as it extends toward the LED element 3, so that the convex lens condensing surface 4b and the annular condensing surface 4c are orthogonal to the optical axis L1. It is not continuous in the direction (having a slight gap) and is slightly different from known Fresnel lenses. And as shown in FIG. 2, the cyclic | annular condensing surface 4c controls the light A5 from the LED element 3 to the direction approaching the optical axis L1 (it is set as the light B5). Further, the light control surface 4a of the present embodiment has three diverging surfaces 4d and three annular condensing surfaces 4c alternately in the radial direction.

次に、上記実施の形態の特徴的な効果を以下に記載する。
（１）プリズム４のＬＥＤ素子３との対向側には、ＬＥＤ素子３からの光の光軸Ｌ１を中心とした円形で凹凸を有する光制御面４ａが形成される。この光制御面４ａは、ＬＥＤ素子３からの光を光軸Ｌ１に近づく方向に制御する集光面（凸レンズ集光面４ｂ及び環状集光面４ｃ）を有するため、照明器具１の下方の作業範囲を明るく照らすことができる。又、光制御面４ａは、ＬＥＤ素子３からの光をプリズム４の照射方向側（下側）における光制御面４ａとの対向面よりも外側に到達させるように制御する発散面４ｄを有するため、照明器具１（プリズム４）における輝度むらが低減される。言い換えると、照明器具１（プリズム４）におけるＬＥＤ素子３の真下の周りが著しく暗く見えることが抑えられ、見栄えの悪化が抑えられる。これらのことから、単一のプリズム４による簡単な構成で、照明器具１の下方の作業範囲を明るく照らすことができるとともに、見栄えを良くすることができる。 Next, the characteristic effects of the above embodiment will be described below.
(1) On the opposite side of the prism 4 to the LED element 3, a light control surface 4a having a circular shape with the optical axis L1 of the light from the LED element 3 as a center is formed. Since this light control surface 4a has a condensing surface (convex lens condensing surface 4b and annular condensing surface 4c) for controlling the light from the LED element 3 in a direction approaching the optical axis L1, the operation below the lighting fixture 1 is performed. The range can be illuminated brightly. In addition, the light control surface 4a has a diverging surface 4d that controls the light from the LED element 3 to reach the outside of the surface facing the light control surface 4a on the irradiation direction side (lower side) of the prism 4. The brightness unevenness in the lighting fixture 1 (prism 4) is reduced. In other words, it is possible to suppress the area around the LED element 3 in the lighting fixture 1 (prism 4) from appearing extremely dark, and to suppress deterioration in appearance. From these things, the simple structure by the single prism 4 can brightly illuminate the work range below the lighting fixture 1, and can improve the appearance.

（２）発散面４ｄは、ＬＥＤ素子３からの光を自身と対向する前記対向面（光制御面４ａとの対向面）と隣り合う前記対向面（隣り合う光制御面４ａの対向面）との間Ｚに到達させるように制御する。よって、照明器具１（プリズム４）におけるＬＥＤ素子３の真下同士の間が著しく暗く見えることが効率良く抑えられ、見栄えの悪化が抑えられる。   (2) The diverging surface 4d is adjacent to the facing surface (facing the light control surface 4a) facing the light from the LED element 3 and the facing surface (facing the adjacent light control surface 4a). Control to reach Z during Therefore, it can be efficiently suppressed that the space immediately below the LED elements 3 in the lighting fixture 1 (prism 4) looks extremely dark, and deterioration of appearance can be suppressed.

（３）ＬＥＤ素子３とそれに対向する光制御面４ａがそれぞれ３つ設けられ、隣り合う光制御面４ａの中心間距離が全て等しくなるように配置されるため、照明器具１（プリズム４）におけるＬＥＤ素子３の真下同士の各間が均等な輝度となり見栄えが良好となる。   (3) Since there are three LED elements 3 and three light control surfaces 4a facing each other, and the distances between the centers of the adjacent light control surfaces 4a are all equal, in the lighting fixture 1 (prism 4) The portions immediately below the LED elements 3 have uniform brightness, and the appearance is good.

上記実施の形態は、以下のように変更してもよい。
・上記実施の形態では、プリズム４の照射方向側（下側）の全面が平坦面であるとしたが、プリズム４の照射方向側（下側）における前記対向面（光制御面４ａとの対向面）の外側を散乱透過面としてもよい。 The above embodiment may be modified as follows.
In the above embodiment, the entire surface on the irradiation direction side (lower side) of the prism 4 is a flat surface. However, the opposing surface on the irradiation direction side (lower side) of the prism 4 (opposite the light control surface 4a). The outer side of the surface may be a scattering transmission surface.

例えば、図３に示すように、前記対向面（光制御面４ａとの対向面）と隣り合う前記対向面（隣り合う光制御面４ａの対向面）との間Ｚを散乱透過面４ｅとしてもよい。尚、散乱透過面４ｅとは、平坦面では全反射してしまう入射角の光を作業範囲方向（下方）に向けることができる面であり、例えばシボ加工等の表面を荒らすブラスト処理を施した面である。   For example, as shown in FIG. 3, a Z between the opposing surface (opposite surface with the light control surface 4a) and the adjacent opposing surface (opposite surface of the adjacent light control surface 4a) may be used as the scattering transmission surface 4e. Good. The scattering transmission surface 4e is a surface that can direct light of an incident angle that is totally reflected on a flat surface in the working range direction (downward), and has been subjected to a blasting process that roughens the surface, such as embossing, for example. Surface.

このようにすると、平坦面では全反射してしまう入射角の光を作業範囲方向（下方）に向けることができる。よって、器具効率を向上させることができるとともに、照明器具１（プリズム４）における輝度むらを低減することができる。   If it does in this way, the light of the incident angle which totally reflects on a flat surface can be directed to a working range direction (downward). Therefore, it is possible to improve the fixture efficiency and reduce the luminance unevenness in the lighting fixture 1 (prism 4).

・上記実施の形態では、ＬＥＤ素子３とそれに対向する光制御面４ａがそれぞれ３つ設けられる照明器具１としたが、それらの数は他の数に変更してもよい。
例えば、図４に示すように、ＬＥＤ素子３とそれに対向する光制御面４ａがそれぞれ１つしか設けられていない照明器具１１として具体化してもよい。このようにしても、集光面（凸レンズ集光面４ｂ及び環状集光面４ｃ）にて、照明器具１の下方の作業範囲を明るく照らすことができる。又、発散面４ｄにて、照明器具１（プリズム４）におけるＬＥＤ素子３の真下の周りが著しく暗く見えることが抑えられ、見栄えの悪化が抑えられる。これらのことから、単一のプリズム４による簡単な構成で、照明器具１の下方の作業範囲を明るく照らすことができるとともに、見栄えを良くすることができる。 In the above embodiment, the lighting device 1 is provided with three LED elements 3 and three light control surfaces 4a facing each other, but the number thereof may be changed to another number.
For example, as shown in FIG. 4, you may actualize as the lighting fixture 11 in which only one LED element 3 and the light control surface 4a which opposes each are provided. Even in this case, the work range below the lighting fixture 1 can be brightly illuminated by the condensing surfaces (the convex lens condensing surface 4b and the annular condensing surface 4c). In addition, the diverging surface 4d suppresses the area around the LED element 3 in the lighting fixture 1 (prism 4) from appearing extremely dark, thereby suppressing deterioration in appearance. From these things, the simple structure by the single prism 4 can brightly illuminate the work range below the lighting fixture 1, and can improve the appearance.

又、例えば、図５に示すように、ＬＥＤ素子３（図示略）とそれに対向する光制御面４ａがそれぞれ多数（図５では光制御面４ａを２２個図示する）設けられた照明器具として具体化してもよい。尚、この例では、光制御面４ａ（ＬＥＤ素子３）が一直線上に並設されるだけでなく、その一直線と直交する方向にも（詳しくは斜め方向にずれて）並設されている。そして、この例においては、各方向（図５中、左右方向と、上斜め方向と、下斜め方向）に隣り合う光制御面４ａの中心間距離が全て等しくなるように配置されている。   Further, for example, as shown in FIG. 5, the lighting device is specifically provided with a plurality of LED elements 3 (not shown) and a plurality of light control surfaces 4 a facing the LED elements 3 (22 light control surfaces 4 a are shown in FIG. 5). May be used. In this example, the light control surfaces 4a (LED elements 3) are not only juxtaposed on a straight line, but are also juxtaposed in a direction orthogonal to the straight line (specifically, shifted in an oblique direction). In this example, the distances between the centers of the light control surfaces 4a adjacent to each other (the left-right direction, the upper diagonal direction, and the lower diagonal direction in FIG. 5) are all equal.

このようにしても、照明器具１（プリズム４）におけるＬＥＤ素子３の真下同士の各間が均等な輝度となり見栄えが良好となる。
・上記実施の形態では、光制御面４ａは、集光面として凸レンズ集光面４ｂを有するとしたが、これに限定されず、凸レンズ集光面４ｂは平坦面として環状集光面４ｃのみを集光面とした構成としてもよい。 Even if it does in this way, between each right under the LED element 3 in the lighting fixture 1 (prism 4) will become equal brightness | luminance, and an appearance will become favorable.
In the above embodiment, the light control surface 4a has the convex lens condensing surface 4b as the condensing surface. However, the present invention is not limited to this, and the convex lens condensing surface 4b has only the annular condensing surface 4c as a flat surface. It is good also as a structure made into the condensing surface.

・上記実施の形態では、発散面４ｄは、断面が傾斜した傾斜面であるとしたが、ＬＥＤ素子３からの光の少なくとも一部をプリズム４の照射方向側における光制御面４ａとの対向面よりも外側に到達させることができれば、断面が湾曲した湾曲面としてもよい。又、発散面４ｄは、自身によってプリズム４の照射方向側（下側）に到達される全ての光の範囲が前記対向面同士の間Ｚの全範囲と同じとなるように設定してもよいし、到達される全ての光の範囲が前記間Ｚの全範囲内の一部に収まるように設定してもよい。又、到達される全ての光の内の一部が前記間Ｚの少なくとも一部と対応するように設定してもよい。   In the above embodiment, the diverging surface 4d is an inclined surface having an inclined cross section, but at least a part of the light from the LED element 3 faces the light control surface 4a on the irradiation direction side of the prism 4. As long as it can reach the outer side, it may be a curved surface with a curved cross section. Further, the diverging surface 4d may be set so that the range of all the light that reaches the irradiation direction side (lower side) of the prism 4 by itself is the same as the entire range of Z between the opposing surfaces. However, it may be set so that the range of all the light to reach falls within a part of the entire range of Z. Further, it may be set so that a part of all the light reaching corresponds to at least a part of the interval Z.

・上記実施の形態では、環状集光面４ｃは、断面が弧状に形成されたものとしたが、ＬＥＤ素子３からの光を光軸Ｌ１に近づく方向に制御できれば、断面が（直線的に）傾斜した傾斜面としてもよい。   In the above embodiment, the annular light condensing surface 4c has an arc-shaped cross section. However, if the light from the LED element 3 can be controlled in a direction approaching the optical axis L1, the cross section becomes (linearly). An inclined surface may be used.

・上記実施の形態では、光制御面４ａは、発散面４ｄと環状集光面４ｃとを交互に３つずつ有するとしたが、これに限定されず、１つずつや２つずつ等、発散面４ｄと環状集光面４ｃの数を他の数に変更してもよい。   In the above embodiment, the light control surface 4a has the diverging surfaces 4d and the annular condensing surfaces 4c alternately, but is not limited thereto. You may change the number of the surface 4d and the cyclic | annular condensing surface 4c into another number.

・上記実施の形態では、光源をＬＥＤ素子３としたが、これに限定されず、他の光源に変更してもよい。   In the above embodiment, the light source is the LED element 3, but is not limited to this, and may be changed to another light source.

３…ＬＥＤ素子（光源）、４…プリズム、４ａ…光制御面、４ｂ…凸レンズ集光面（集光面）、４ｃ…環状集光面（集光面）、４ｄ…発散面、４ｅ…散乱透過面、Ｌ１…光軸、Ｚ…間。   3 ... LED element (light source), 4 ... prism, 4a ... light control surface, 4b ... convex lens condensing surface (condensing surface), 4c ... annular condensing surface (condensing surface), 4d ... divergent surface, 4e ... scattering. Transmission surface, L1... Optical axis, Z.

Claims (3)

複数の光源と、
前記光源の照射方向に設けられたプリズムと
を備えた照明器具であって、
前記プリズムの前記光源との対向側には、前記光源からの光の光軸を中心とした円形で凹凸を有する光制御面がそれぞれ設けられ、隣り合う光制御面同士は離間するように形成され、
前記光制御面は、前記光源からの光を光軸に近づく方向に制御する集光面と、前記光源からの光を前記プリズムの前記照射方向側における前記光制御面との対向面よりも外側に到達させると共に自身と対向する前記対向面と隣り合う前記対向面との間に到達させるように制御する発散面とを有し、
前記プリズムの前記照射方向側における前記対向面の外側を散乱透過面としたことを特徴とする照明器具。 Multiple light sources;
A lighting fixture including a prism provided in an irradiation direction of the light source,
On the opposite side of the prism from the light source, there are provided light control surfaces that are circular and uneven with the optical axis of the light from the light source as the center, and adjacent light control surfaces are formed so as to be separated from each other. ,
The light control surface is located outside a condensing surface that controls light from the light source in a direction approaching an optical axis and a surface that faces the light control surface on the irradiation direction side of the prism. It possesses a diverging surface that performs control so as to reach between the opposed surface adjacent to its opposed to the facing surface with to reach,
An illumination fixture, wherein an outer side of the facing surface on the irradiation direction side of the prism is a scattering transmission surface . 請求項１に記載の照明器具において、
前記光源と光源に対向する前記光制御面は、それぞれ３つ以上設けられ、
隣り合う前記光制御面の中心間距離が全て等しくなるように配置されたことを特徴とする照明器具。 The lighting fixture according to claim 1,
Three or more light control surfaces facing the light source and the light source are provided,
A lighting apparatus, wherein the distances between the centers of adjacent light control surfaces are all equal. 請求項１又は２に記載の照明器具において、The lighting fixture according to claim 1 or 2,
前記光制御面は、The light control surface is
前記光軸を中心とした環状で前記光源側に延びるほど径方向外側に延びる前記発散面と、The diverging surface that extends radially outward as it extends toward the light source in an annular shape centered on the optical axis;
前記光軸を中心とした環状で前記照射方向側に延びるほど径方向外側に延びる前記集光面とを有することを特徴とする照明器具。An illuminating device comprising: the light collecting surface having an annular shape around the optical axis and extending radially outward as it extends toward the irradiation direction.
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