JP2014160616A - Illumination device - Google Patents

Illumination device Download PDF

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JP2014160616A
JP2014160616A JP2013031219A JP2013031219A JP2014160616A JP 2014160616 A JP2014160616 A JP 2014160616A JP 2013031219 A JP2013031219 A JP 2013031219A JP 2013031219 A JP2013031219 A JP 2013031219A JP 2014160616 A JP2014160616 A JP 2014160616A
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lens
light
guide plate
light guide
distance
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Naoki Kotani
直樹 小谷
Ichiro Tanimura
一郎 谷村
Yuuji Nakagawa
有士 中川
Shinji Kadoriku
晋二 角陸
Ryuma Murase
龍馬 村瀬
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Panasonic Corp
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Panasonic Corp
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  • Planar Illumination Modules (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device capable of reducing thickness, and capable of acquiring a light condensing characteristic more excellent than that of a conventional one.SOLUTION: An illumination device 100 comprises: a plurality of light emitting elements 22; a light guide plate 40; and a light condensing cover 50 for covering a part of a main surface 402 of the light guide plate 40. The light guide plate 40 has a plurality of concave-shaped reflection parts 403 for reflecting light guided into the plate. The light condensing cover 50 has a plurality of upper lens parts 501 and lower lens parts 502 arranged by maintaining an optically opposed relation with each of the concave-shaped reflection parts 403 individually. The upper lens part 501 comprises: a first lens region 5010 which includes an apex 5010a and in which a cross-sectional shape along an optical axis is regulated by a first relational expression; and a second lens region 5011 which includes a base part of the upper lens part 501 and in which a cross-sectional shape is regulated by a second relational expression different from the first relational expression. The cross-sectional shape along an optical axis of the second lens region 5011 is regulated by the second relational expression so that the position of the surface comes outside compared with the case in which it is regulated by the first relational expression.

Description

本発明は、ＬＥＤ（Light Emitting Diode）等の発光素子を光源として備えるダウンライト型の照明装置に関する。本発明は特に、集光型の照明装置に関する。   The present invention relates to a downlight type illumination device including a light emitting element such as an LED (Light Emitting Diode) as a light source. The present invention particularly relates to a concentrating illumination device.

近年、省エネルギーの観点から、高効率・長寿命なＬＥＤ等の半導体発光素子を光源として利用した照明装置が開発されている。特に近年ではＬＥＤ発光モジュールの広い発光面積を利用したダウンライトやスポットライトが提案されている。例えば特許文献１では、面状発光部を有するＬＥＤ発光モジュールとフレネルレンズを具備した集光型の照明装置が提案されている。   In recent years, from the viewpoint of energy saving, lighting devices using semiconductor light emitting elements such as LEDs with high efficiency and long life as light sources have been developed. Particularly in recent years, downlights and spotlights using a wide light emitting area of LED light emitting modules have been proposed. For example, Patent Document 1 proposes a condensing illumination device including an LED light emitting module having a planar light emitting unit and a Fresnel lens.

図１９の断面図に特許文献１記載の照明装置８００の構成を示す。照明装置８００は、筐体８０１と、筐体８０１の内部に収納された発光モジュール８０２と、光路上に配されたフレネルレンズ８０３とを備える。発光モジュール８０２は板状の基体８０２０と、基体８０２０上に実装された発光素子（ＬＥＤ）８０２１と、発光素子８０２１の前方の配された蛍光体層８０２２とを備える。照明装置８００に電力供給することにより各発光素子８０２１が点灯する。発光素子８０２１から出射された光Ｌ1、Ｌ2はフレネルレンズ８０３を透過する。光Ｌ1、Ｌ2はフレネルレンズ８０３にて平行光に調整され、外部に照射される。 The cross-sectional view of FIG. 19 shows the configuration of the lighting device 800 described in Patent Document 1. The lighting device 800 includes a housing 801, a light emitting module 802 housed inside the housing 801, and a Fresnel lens 803 disposed on the optical path. The light emitting module 802 includes a plate-like substrate 8020, a light emitting element (LED) 8021 mounted on the substrate 8020, and a phosphor layer 8022 disposed in front of the light emitting element 8021. By supplying power to the lighting device 800, each light emitting element 8021 is turned on. Lights L 1 and L 2 emitted from the light emitting element 8021 pass through the Fresnel lens 803. Lights L 1 and L 2 are adjusted to parallel light by a Fresnel lens 803 and irradiated outside.

特開２０１２−１１４０２２号公報JP 2012-114022 A

しかしながら従来の集光方式の照明装置では、一定の配光角で集光するために光源からレンズまでの間に所定の長さの光路を確保することが必要である。その結果、照明装置の薄型化と狭配向とを同時に実現することは難しかった。
例えば、特許文献１記載の従来の照明装置８００では、配向性を評価するための指標のひとつである１／２ビーム角を４５°とした場合には、光源の発光部からレンズ表面までの光路長に２７ｍｍの長さが必要であった。他方、上記光路長を１０ｍｍに短縮した場合には１／２ビーム角は１００°となり、薄型と狭配向との両立に向けては、さらなる改善が必要であった。 However, in the conventional condensing type illumination device, it is necessary to secure an optical path having a predetermined length between the light source and the lens in order to condense at a constant light distribution angle. As a result, it has been difficult to simultaneously realize the thinning and narrow orientation of the lighting device.
For example, in the conventional illumination device 800 described in Patent Document 1, when the 1/2 beam angle, which is one of the indices for evaluating the orientation, is 45 °, the optical path from the light emitting part of the light source to the lens surface A length of 27 mm was required. On the other hand, when the optical path length was shortened to 10 mm, the 1/2 beam angle was 100 °, and further improvement was necessary to achieve both thinness and narrow orientation.

本発明は上記課題に鑑みてなされたものであって、薄型で狭配向を実現可能な照明装置を提供することを目的とする。   The present invention has been made in view of the above problems, and an object thereof is to provide a lighting device that is thin and capable of realizing narrow orientation.

上記目的を達成するために、本発明の一態様に係る照明装置は、複数の発光素子と、前記複数の発光素子から出射した光を板内において導光する導光板と、前記導光板の主面の少なくとも一部を覆う集光カバーとを備え、前記導光板は、前記主面と背向する裏面の一部を凹入させ且つ前記導光板の板内に導光される光を前記集光カバー側に反射させる複数の凹状反射部を有し、前記集光カバーは、前記各凹状反射部と個別に光学的な対向関係を保って配置され且つ前記各凹状反射部からの反射光を前記導光板の主面に垂直な主出射方向に集光する複数のレンズ部とを有し、前記レンズ部は、光軸上の基準位置からレンズ表面の任意位置までの距離と、前記基準位置及びレンズ表面の任意位置を通る直線と前記光軸とのなす角度とを関係付ける関係式により、表面形状が規定される非球面レンズであり、前記レンズ部の頂部を含む第１レンズ領域と、前記レンズ部の基部を含み且つ前記第１レンズ領域と隣り合う第２レンズ領域とを有し、前記第１レンズ領域の表面形状が第１関係式で規定され、前記第２レンズ領域の表面形状が、前記第１関係式で規定した場合に比べて前記距離が長くなる第２関係式で規定されている照明装置とする。   In order to achieve the above object, an illumination device according to one embodiment of the present invention includes a plurality of light-emitting elements, a light guide plate that guides light emitted from the plurality of light-emitting elements in the plate, and a main part of the light guide plate. A light collecting cover that covers at least a part of the surface, wherein the light guide plate has a part of the back surface facing away from the main surface and the light guided into the plate of the light guide plate. A plurality of concave reflecting portions that are reflected on the light cover side, and the light collecting cover is disposed in an optically opposed relationship with each concave reflecting portion and reflects light from each concave reflecting portion. A plurality of lens portions that condense in a main emission direction perpendicular to the main surface of the light guide plate, and the lens portion includes a distance from a reference position on the optical axis to an arbitrary position on the lens surface, and the reference position. And an angle formed by a straight line passing through an arbitrary position on the lens surface and the optical axis. The aspherical lens whose surface shape is defined by the equation, a first lens region including a top portion of the lens portion, and a second lens region including a base portion of the lens portion and adjacent to the first lens region And the surface shape of the first lens region is defined by a first relational expression, and the surface shape of the second lens region is longer than that defined by the first relational expression. The lighting device is defined by the relational expression.

本発明の別の態様に係る照明装置では、前記集光カバーは、主面に前記各レンズ部が配置された板状のベース部をさらに有し、前記集光カバーは、前記ベース部の主面と背向する裏面において前記導光板の主面と対向配置され、前記各レンズ部のピッチをＷ、前記導光板の板厚をＤとするとき、１．５≦Ｗ／Ｄ≦２．５の関係が成立する構成とすることもできる。   In the illumination device according to another aspect of the present invention, the light collecting cover further includes a plate-like base portion in which the lens portions are arranged on a main surface, and the light collecting cover is a main portion of the base portion. 1.5 ≦ W / D ≦ 2.5, where the back surface opposite to the surface is opposed to the main surface of the light guide plate, the pitch of the lens portions is W, and the thickness of the light guide plate is D. It is also possible to adopt a configuration in which

本発明の別の態様に係る照明装置では、前記導光板中の基準位置Ａから前記第１レンズ領域の表面の任意位置までの距離をｒ1、前記基準位置Ａから前記頂部までの距離をｔ1、前記距離ｒ1を通る直線と前記レンズ部の光軸との間の角度をθ1、ｎを前記導光板の屈折率とするとき、前記第１関係式としてｒ1＝（ｎ−１）×ｔ1／（ｎ−ｃｏｓθ1）が成立する構成とすることもできる。 In the illumination device according to another aspect of the present invention, the distance from the reference position A in the light guide plate to an arbitrary position on the surface of the first lens region is r 1 , and the distance from the reference position A to the top is t. 1 , where θ 1 is the angle between the straight line passing through the distance r 1 and the optical axis of the lens unit, and n is the refractive index of the light guide plate, r 1 = (n−1) ) × t 1 / (n−cos θ 1 ).

本発明の別の態様に係る照明装置では、前記導光板中の基準位置Ａから前記第２レンズ領域の表面の任意位置までの距離をｒ2、基準位置Ａから前記第１レンズ領域の表面までの最大高さをｔ1、前記距離ｒ2を通る直線と前記レンズ部の光軸との間の角度をθ2、ｎを前記導光板の屈折率、ｋ1、ｋ2を正の定数、基準位置Ａから前記レンズ部の表面における前記第１レンズ領域と前記第２レンズ領域との境界を通る直線と前記レンズ部の光軸との間の角度をθchとするとき、前記第２関係式としてｒ2＝（ｎ−１）｛ｔ1＋ｋ1（θ2−θch）k2／（ｎ−ｃｏｓθ2）が成立する構成とすることもできる。 In the illumination device according to another aspect of the present invention, the distance from the reference position A in the light guide plate to an arbitrary position on the surface of the second lens region is r 2 , and from the reference position A to the surface of the first lens region. T 1 , the angle between the straight line passing through the distance r 2 and the optical axis of the lens unit is θ 2 , n is the refractive index of the light guide plate, k 1 and k 2 are positive constants, When the angle between the straight line passing through the boundary between the first lens region and the second lens region on the surface of the lens unit from the reference position A and the optical axis of the lens unit is θ ch , the second relationship It is also possible to adopt a configuration in which r 2 = (n−1) {t 1 + k 1 (θ 2 −θ ch ) k 2 / (n−cos θ 2 ) is established as an expression.

本発明の別の態様に係る照明装置では、前記集光カバーは、前記導光板の主面と対向するように配置された複数の補助レンズ部をさらに有し、前記各補助レンズ部は前記各レンズ部と個別に互いの光軸が一致するように配置されている構成とすることもできる。
本発明の別の態様に係る照明装置では、前記補助レンズ部の光軸に沿った前記導光板中の基準位置Ｂから前記補助レンズ部の表面の任意位置までの距離をｒ3、前記基準位置Ｂから前記補助レンズの頂部までの距離をｔ3、前記距離ｒ3を通る直線と前記補助レンズ部の光軸との間の角度をθ3、ｎを前記集光カバーの屈折率とするとき、第３関係式としてｒ3＝（ｎ−１）×ｔ3×ｃｏｓθ3／（（ｎ×ｃｏｓ−１）×√ｎ2−ｓｉｎ2θ3）が成立する構成とすることもできる。 In the illumination device according to another aspect of the present invention, the light collection cover further includes a plurality of auxiliary lens portions arranged so as to face the main surface of the light guide plate, and each of the auxiliary lens portions is the It can also be set as the structure arrange | positioned so that a mutual optical axis may correspond with a lens part separately.
In the illumination device according to another aspect of the present invention, the distance from the reference position B in the light guide plate along the optical axis of the auxiliary lens unit to an arbitrary position on the surface of the auxiliary lens unit is r 3 , and the reference position When the distance from B to the top of the auxiliary lens is t 3 , the angle between the straight line passing through the distance r 3 and the optical axis of the auxiliary lens part is θ 3 , and n is the refractive index of the light collecting cover. As a third relational expression, r 3 = (n−1) × t 3 × cos θ 3 / ((n × cos−1) × √n 2 −sin 2 θ 3 ) may be established.

本発明の別の態様に係る照明装置では、前記凹状反射部を円錐状とすることもできる。
本発明の別の態様に係る照明装置では、基板表面に前記複数の発光素子が実装されてなる実装基板をさらに備え、前記複数の発光素子は前記基板上において環状の素子列を形成し、前記導光板は、前記素子列に沿って環状に配された環状部と、前記環状部の内側に前記環状部と連続して配された環内部とを有する円盤状であり、前記凹状反射部が少なくとも前記環状部に存在している構成とすることもできる。 In the illumination device according to another aspect of the present invention, the concave reflecting portion may be conical.
The lighting device according to another aspect of the present invention further includes a mounting substrate in which the plurality of light emitting elements are mounted on a surface of the substrate, the plurality of light emitting elements forming an annular element array on the substrate, The light guide plate has a disc shape having an annular portion arranged annularly along the element row and an inside of the annular portion continuously arranged with the annular portion inside the annular portion, and the concave reflecting portion is It can also be set as the structure which exists in the said annular part at least.

本発明の別の態様に係る照明装置では、前記発光素子をＬＥＤとすることもできる。
本発明の別の態様に係る照明装置では、前記発光素子に電力供給するための電源ユニットを有する構成とすることもできる。 In the illumination device according to another aspect of the present invention, the light-emitting element may be an LED.
The lighting device according to another aspect of the present invention may include a power supply unit for supplying power to the light emitting element.

本発明の一態様に係る照明装置では、導光板と、導光板の主面の少なくとも一部を覆うように配される集光カバーとを用いることで、発光素子からレンズ部に至る光路の短縮を図れる。この光路の短縮によって照明装置の薄型化を実現できる。
また、集光カバーに設けられたレンズ部は、光軸上の基準位置からレンズ表面の任意位置までの距離と、基準位置及びレンズ表面の任意位置を通る直線と光軸とのなす角度とを関係付ける関係式により、表面形状が規定される。レンズ部は、レンズ部の頂部を含み且つ表面形状が第１関係式で規定される第１レンズ領域と、レンズ部の基部を含み且つ第１レンズ領域と隣り合い、表面形状が第２関係式で規定される第２レンズ領域とを有する。ここで第２関係式は、第２レンズ領域の表面形状を第１関係式で規定した場合に比べて前記距離が長くなる関係式である。 In the lighting device according to one embodiment of the present invention, the light path from the light emitting element to the lens unit is shortened by using the light guide plate and the light collecting cover arranged to cover at least a part of the main surface of the light guide plate. Can be planned. By shortening the optical path, the lighting device can be made thinner.
Further, the lens portion provided in the light collecting cover has a distance from a reference position on the optical axis to an arbitrary position on the lens surface, and an angle formed by a straight line passing through the reference position and the arbitrary position on the lens surface and the optical axis. The surface shape is defined by the relational expression to be related. The lens portion includes a top portion of the lens portion and the surface shape is defined by the first relational expression, and includes a base portion of the lens portion and is adjacent to the first lens area, and the surface shape is the second relational expression. And a second lens region defined by Here, the second relational expression is a relational expression in which the distance becomes longer than that in the case where the surface shape of the second lens region is defined by the first relational expression.

このような形状のレンズ部によれば、導光板から集光カバーに光を入射させた場合、第２レンズ領域の表面への光の入射角を小さくできる。これにより、第２レンズ領域の表面で正反射されて戻る光や、第２レンズ領域の表面で正反射されて拡散する光が低減し、第２レンズ領域から外部に向けて効率よく光を出射できる。
従ってレンズ部からは、第２レンズ領域から外部に出射させる光と、レンズ部の頂部を含む第１レンズ領域から外部に出射される光とを、導光板の主面に垂直な主出射方向に集光して出射できる。結果として、優れた狭配向の集光特性を得ることが可能な照明装置を提供できる。 According to the lens portion having such a shape, when light is incident on the light collecting cover from the light guide plate, the incident angle of light on the surface of the second lens region can be reduced. This reduces the light that is reflected back from the surface of the second lens region and the light that is reflected back and diffused from the surface of the second lens region, and efficiently emits light from the second lens region to the outside. it can.
Therefore, from the lens unit, the light emitted to the outside from the second lens region and the light emitted to the outside from the first lens region including the top of the lens unit are transmitted in the main emission direction perpendicular to the main surface of the light guide plate. It can be condensed and emitted. As a result, it is possible to provide an illuminating device that can obtain excellent narrow orientation light condensing characteristics.

実施の形態１に係る照明装置１００の構成及び設置例を示す、一部断面図である。It is a partial cross section figure which shows the structure and installation example of the illuminating device 100 which concern on Embodiment 1. FIG. 照明器具１の外観構成と内部構成を示す斜視図である。It is a perspective view which shows the external appearance structure and internal structure of the lighting fixture 1. FIG. 照明器具１の正面図である。1 is a front view of a lighting fixture 1. FIG. 照明器具１の内部構成を示す分解図である。2 is an exploded view showing an internal configuration of the lighting fixture 1. FIG. 照明器具１の内部構成を示す断面斜視図である。FIG. 3 is a cross-sectional perspective view showing an internal configuration of the lighting fixture 1. 反射部材３０の構成を示す正面図である。4 is a front view showing a configuration of a reflecting member 30. FIG. 図５の領域Ａの拡大断面図である。It is an expanded sectional view of the area | region A of FIG. 図５の領域Ｂの拡大断面図である。It is an expanded sectional view of the area | region B of FIG. 上レンズ部５０１及び下レンズ部５０２の具体的な構成を示す断面図である。FIG. 6 is a cross-sectional view showing specific configurations of an upper lens unit 501 and a lower lens unit 502. 上レンズ部５０１の第１レンズ領域５０１０と第２レンズ領域５０１１の各表面形状を示すグラフである。5 is a graph showing surface shapes of a first lens region 5010 and a second lens region 5011 of the upper lens unit 501. 下レンズ部５０２の表面形状を示すグラフである。5 is a graph showing a surface shape of a lower lens unit 502. 集光カバー５０Ａ周辺における課題を示す図である。It is a figure which shows the subject in the condensing cover 50A periphery. 集光カバー５０周辺で奏される効果を示す図である。It is a figure which shows the effect show | played by the condensing cover 50 periphery. 集光カバー５０Ｂ周辺における課題を示す図である。It is a figure which shows the subject in the condensing cover 50B periphery. 集光カバー５０周辺で奏される効果を示す図である。It is a figure which shows the effect show | played by the condensing cover 50 periphery. 実施例と比較例の照度分布のシミュレーション結果を示すグラフである。It is a graph which shows the simulation result of the illumination intensity distribution of an Example and a comparative example. 図１６における配向角度±３０°以内の曲線を拡大したグラフである。It is the graph which expanded the curve within the orientation angle +/- 30 degree in FIG. シミュレーション結果に基づき算出した、実施例と比較例の±１０°及び±２０°の範囲の光束を比較したグラフである。It is the graph which compared the light beam of the range of +/- 10 degree and +/- 20 degree of an Example and a comparative example computed based on the simulation result. 従来の照明装置８００の構成を示す断面図である。It is sectional drawing which shows the structure of the conventional illuminating device 800. FIG.

以下、本発明の実施の形態に係る照明装置について図面を参照しながら説明する。
＜実施の形態＞
（照明装置１００）
図１の一部断面図に示すように、照明装置１００は、照明器具１と、掛止部材３と、電源ユニット４とを備えてなる。掛止部材３は板バネであり、照明器具１の背面側にあるベース１０に取着される。電源ユニット４は照明器具１を点灯させる。電源ユニット４は配線２３において照明器具１と電気接続されている。照明装置１００は、天井等の造営材に設置する埋設型のダウンライトである。 Hereinafter, a lighting device according to an embodiment of the present invention will be described with reference to the drawings.
<Embodiment>
(Lighting device 100)
As illustrated in the partial cross-sectional view of FIG. 1, the lighting device 100 includes a lighting fixture 1, a hooking member 3, and a power supply unit 4. The retaining member 3 is a leaf spring and is attached to the base 10 on the back side of the lighting fixture 1. The power supply unit 4 turns on the lighting fixture 1. The power supply unit 4 is electrically connected to the lighting fixture 1 through the wiring 23. The lighting device 100 is a buried downlight that is installed on a construction material such as a ceiling.

図１に示す照明装置１００では、電源ユニット４が天井２に設けた貫通孔２ａを介し、天井２の裏面２ｂに載置される。貫通孔２ａにベース１０が収納されるように照明器具１が配置される。掛止部材３は貫通孔２ａの周縁に掛止される。これにより照明装置１００が天井２に設置される。
照明器具１は、外観的には図２に示すように、ベース１０と、集光カバー５０と、拡散カバー６０とで構成される。ベース１０に設けられた切欠部１６からは配線２３が外部に延出されている。図２中の点線は、照明器具１に内蔵された実装基板２０と、実装基板２０における基板２１と、発光素子２２の各位置を示す。照明器具１は、正面から見ると図３に示すように、集光カバー５０の周囲が拡散カバー６０で覆われている。照明器具１のサイズは、一例として外径約１３６ｍｍ、厚み約１８ｍｍである。
（照明器具１）
照明器具１は分解図の図４に示すように、ベース１０と、実装基板２０と、反射部材３０と、導光板４０と、集光カバー５０と、拡散カバー６０とを有する。照明器具１は全体形状が円盤状である。ベース１０と、実装基板２０と、反射部材３０と、導光板４０と、集光カバー５０と、拡散カバー６０とは、外周が円形状に形成される。
［ベース１０］
ベース１０は放熱特性に優れる材料、例えばアルミニウム等の金属材料で構成される。ベース１０は、本体部１１と、フランジ部１２とを有する。フランジ部１２には切欠部１６が存在する。 In the lighting device 100 shown in FIG. 1, the power supply unit 4 is placed on the back surface 2 b of the ceiling 2 through the through hole 2 a provided in the ceiling 2. The lighting fixture 1 is arrange | positioned so that the base 10 may be accommodated in the through-hole 2a. The latch member 3 is latched on the periphery of the through hole 2a. Thereby, the lighting device 100 is installed on the ceiling 2.
As shown in FIG. 2, the lighting fixture 1 includes a base 10, a light collecting cover 50, and a diffusion cover 60. A wiring 23 extends to the outside from the notch 16 provided in the base 10. A dotted line in FIG. 2 indicates each position of the mounting substrate 20 incorporated in the lighting fixture 1, the substrate 21 in the mounting substrate 20, and the light emitting element 22. As shown in FIG. 3, the luminaire 1 is covered with a diffusion cover 60 when viewed from the front, as shown in FIG. 3. As an example, the size of the lighting fixture 1 is an outer diameter of about 136 mm and a thickness of about 18 mm.
(Lighting fixture 1)
As illustrated in FIG. 4 of the exploded view, the lighting fixture 1 includes a base 10, a mounting substrate 20, a reflecting member 30, a light guide plate 40, a light collecting cover 50, and a diffusion cover 60. The lighting fixture 1 has a disc shape as a whole. The outer periphery of the base 10, the mounting substrate 20, the reflection member 30, the light guide plate 40, the light collection cover 50, and the diffusion cover 60 is formed in a circular shape.
[Base 10]
The base 10 is made of a material having excellent heat dissipation characteristics, for example, a metal material such as aluminum. The base 10 has a main body part 11 and a flange part 12. The flange portion 12 has a notch portion 16.

本体部１１は、中央側から周縁側に向けて、円盤状の内側底部１３と、内側底部１３の周縁に立設された側壁部１４と、側壁部１４の周囲に配された環状の外側底部１５とを有する。
内側底部１３には実装基板２０と反射部材３０とが順次重ねて載置される。外側底部１５には導光板４０の環状外周部４３が載置される。 The main body 11 includes a disk-shaped inner bottom portion 13, a side wall portion 14 erected on the peripheral edge of the inner bottom portion 13, and an annular outer bottom portion disposed around the side wall portion 14 from the central side toward the peripheral side. 15.
The mounting substrate 20 and the reflecting member 30 are sequentially stacked on the inner bottom portion 13. An annular outer peripheral portion 43 of the light guide plate 40 is placed on the outer bottom portion 15.

フランジ部１２は本体部１１の周囲に立設される。ベース１０はフランジ部１２のＺ方向頂部付近において、拡散カバー６０の側壁部６２と接着剤やシール部材等を用いて接合される。
［実装基板２０］
実装基板２０は、環状の基板２１と、複数の発光素子２２と、配線２３とを有する。 The flange portion 12 is erected around the main body portion 11. The base 10 is joined to the side wall portion 62 of the diffusion cover 60 near the top of the flange portion 12 in the Z direction using an adhesive, a seal member, or the like.
[Mounting board 20]
The mounting substrate 20 includes an annular substrate 21, a plurality of light emitting elements 22, and wirings 23.

基板２１は、例えば、セラミックス材料や熱伝導樹脂等からなる絶縁層と、アルミニウム等からなる金属層とを積層した構造を有する。基板２１の表面には発光素子２２と配線２３とを電気接続するための配線パターン（不図示）が形成される。
発光素子２２は、一例としてＬＥＤである。基板２１の反射部材３０と対向する表面に対し、発光素子２２がその主出射方向を垂直（Ｚ）方向に合わせて実装される。基板２１上で各発光素子２２は、互いに一定間隔をおいて円周状の素子列を形成する。実装基板２０では、一例として合計１８個の発光素子２２が配線パターンに対し、ＣＯＢ（Chip on Board）技術を用いてフェイスアップ実装されている。 The substrate 21 has a structure in which, for example, an insulating layer made of a ceramic material or a heat conductive resin and a metal layer made of aluminum or the like are laminated. A wiring pattern (not shown) for electrically connecting the light emitting element 22 and the wiring 23 is formed on the surface of the substrate 21.
The light emitting element 22 is an LED as an example. The light emitting element 22 is mounted on the surface of the substrate 21 facing the reflecting member 30 so that the main emission direction is aligned with the vertical (Z) direction. On the substrate 21, the light emitting elements 22 form a circumferential element array at a predetermined interval. On the mounting board 20, as an example, a total of 18 light emitting elements 22 are face-up mounted on a wiring pattern using a COB (Chip on Board) technique.

尚、基板２１の表面は、発光素子２２の出射光を効率良く導光板４０側へ反射させるために光反射性を有する反射面となっている。
配線２３は、電源ユニット４側より発光素子２２に電力供給を行うために用いられる。配線２３の両端は、基板２１の配線パターンと、電源ユニット４とに電気接続されている。
［反射部材３０］
反射部材３０は板状部材であり、導光板４０からの戻り光を導光板４０側に反射する。反射部材３０は実装基板２０と導光板４０との間に挟設される。反射部材３０は、高光反射特性を有する材料、例えばポリブチレンテレフタレート（ＰＢＴ）樹脂、ポリカーボネート（ＰＣ）樹脂、ナイロン樹脂、発泡樹脂等を用いて構成される。これらの樹脂材料で反射部材３０を射出成形することで、高精度で反射部材３０を構成できる。反射部材３０は、少なくともその表面において光反射特性を有していれば良い。 The surface of the substrate 21 is a reflective surface having light reflectivity in order to efficiently reflect the emitted light of the light emitting element 22 toward the light guide plate 40 side.
The wiring 23 is used to supply power to the light emitting element 22 from the power supply unit 4 side. Both ends of the wiring 23 are electrically connected to the wiring pattern of the substrate 21 and the power supply unit 4.
[Reflection member 30]
The reflection member 30 is a plate-like member, and reflects the return light from the light guide plate 40 toward the light guide plate 40 side. The reflection member 30 is sandwiched between the mounting substrate 20 and the light guide plate 40. The reflection member 30 is configured using a material having high light reflection characteristics, for example, polybutylene terephthalate (PBT) resin, polycarbonate (PC) resin, nylon resin, foam resin, or the like. The reflective member 30 can be configured with high accuracy by injection molding the reflective member 30 with these resin materials. The reflection member 30 should just have a light reflection characteristic in the surface at least.

照明器具１の断面図（図５）と、反射部材３０の正面図（図６）と、図５の領域Ａの拡大断面図（図７）に反射部材３０の具体的構成を示す。反射部材３０は中央側から外側に向けて、内側反射部３１と、凹入部３２と、外側反射部３３とを有する。反射部材３０の外径はベース１０の側壁部１４の内径と略一致する。内側反射部３１は上面３１０において導光板４０と対向する。また外側反射部３３は上面３２０において導光板４０と対向する。   A specific configuration of the reflecting member 30 is shown in a sectional view (FIG. 5) of the luminaire 1, a front view of the reflecting member 30 (FIG. 6), and an enlarged sectional view (FIG. 7) of the region A in FIG. 5. The reflecting member 30 includes an inner reflecting portion 31, a recessed portion 32, and an outer reflecting portion 33 from the center side toward the outside. The outer diameter of the reflecting member 30 substantially matches the inner diameter of the side wall portion 14 of the base 10. The inner reflection portion 31 faces the light guide plate 40 on the upper surface 310. Further, the outer reflecting portion 33 faces the light guide plate 40 on the upper surface 320.

図５のように内側反射部３１は、実装基板２０の発光素子２２の実装位置より内側の位置に設けられる。また外側反射部３３は、実装基板２０の発光素子２２の実装位置より外側の位置に設けられる。内側反射部３１と外側反射部３３とは、導光板４０からの戻り光を再度、導光板４０側に反射させる。
凹入部３２は図５と図７とに示すように、実装基板２０の各発光素子２２の実装位置に対応する反射部材３０の領域を、厚み（Ｚ）方向に沿って実装基板２０側に凹入させてなる。 As shown in FIG. 5, the inner reflecting portion 31 is provided at a position inside the mounting position of the light emitting element 22 of the mounting substrate 20. The outer reflecting portion 33 is provided at a position outside the mounting position of the light emitting element 22 on the mounting substrate 20. The inner reflection part 31 and the outer reflection part 33 reflect the return light from the light guide plate 40 to the light guide plate 40 side again.
As shown in FIG. 5 and FIG. 7, the recessed portion 32 is formed so that a region of the reflecting member 30 corresponding to the mounting position of each light emitting element 22 on the mounting substrate 20 is recessed toward the mounting substrate 20 along the thickness (Z) direction. Let me enter.

図７に示すように、凹入部３２の内部には、反射部材３０の厚み（Ｚ）方向を貫通する複数の開口３４が一定間隔をおいて存在する。開口３４の位置は、実装基板２０上の各発光素子２２の位置と一致する。
［導光板４０］
導光板４０は、発光素子２２から出射した光をその板内において導光する。図４のように導光板４０は、反射部材３０と集光カバー５０（拡散カバー６０）との間に介設される。これにより、導光板４０の上方から出射される光は集光カバー５０と拡散カバー６０とに入射される。導光板４０は透光性に優れる材料、例えばアクリル樹脂、ポリカーボネート樹脂、ポリスチレン樹脂、ガラスのいずれか等からなる。具体的構成として、導光板４０は中央側から外側に向けて、環内部４１と、環状部４２と、環状外周部４３とを有する。一例として、導光板４０の外径は約１２８ｍｍ、板厚Ｄ3（図９）は約１．５ｍｍである。 As shown in FIG. 7, a plurality of openings 34 penetrating in the thickness (Z) direction of the reflecting member 30 are present in the recessed portion 32 at regular intervals. The position of the opening 34 coincides with the position of each light emitting element 22 on the mounting substrate 20.
[Light guide plate 40]
The light guide plate 40 guides the light emitted from the light emitting element 22 in the plate. As shown in FIG. 4, the light guide plate 40 is interposed between the reflecting member 30 and the light collecting cover 50 (diffusion cover 60). Thereby, the light emitted from above the light guide plate 40 enters the light collection cover 50 and the diffusion cover 60. The light guide plate 40 is made of a material having excellent translucency, such as an acrylic resin, a polycarbonate resin, a polystyrene resin, or glass. As a specific configuration, the light guide plate 40 includes a ring interior 41, an annular portion 42, and an annular outer peripheral portion 43 from the center side toward the outside. As an example, the outer diameter of the light guide plate 40 is about 128 mm, and the plate thickness D 3 (FIG. 9) is about 1.5 mm.

（ｉ）環内部４１
環内部４１は円盤状であり、環状部４２より導光板４０の板内に入射された発光素子２２の光を発光素子２２の実装位置よりも内側に導光する。環内部４１の直径は約８０ｍｍである。図５の領域Ｂの拡大断面図（図８）に示すように、環内部４１の裏面４０１には複数の凹状反射部４０３が存在する。凹状反射部４０３は裏面４０１の一部を凹入させてなり、導光板４０の板内を導光される光を主面４０２側に反射させる。凹状反射部４０３は裏面４０１側より主面４０２に向けて、円錐体状に形成されてなる。凹状反射部４０３の斜面間のテーパー角（頂角）は例えば６０°である。各凹状反射部４０３の重心は、凹状反射部４０３の真上に位置する集光カバー５０の下レンズ部５０２及び上レンズ部５０１の光軸上とそれぞれ重なるように配置されている。 (I) Ring interior 41
The ring interior 41 has a disk shape, and guides the light of the light emitting element 22 that has entered the light guide plate 40 from the annular portion 42 to the inside of the mounting position of the light emitting element 22. The diameter of the ring interior 41 is about 80 mm. As shown in the enlarged sectional view of the region B in FIG. 5 (FIG. 8), there are a plurality of concave reflecting portions 403 on the back surface 401 of the inside 41 of the ring. The concave reflecting portion 403 is formed by recessing a part of the back surface 401 and reflects light guided in the light guide plate 40 toward the main surface 402 side. The concave reflecting portion 403 is formed in a conical shape from the back surface 401 side toward the main surface 402. The taper angle (vertical angle) between the inclined surfaces of the concave reflector 403 is, for example, 60 °. The center of gravity of each concave reflecting portion 403 is disposed so as to overlap the optical axis of the lower lens portion 502 and the upper lens portion 501 of the light collecting cover 50 positioned directly above the concave reflecting portion 403.

凹状反射部４０３は環内部４１において多数（ここでは合計４９１個）にわたり、環内部４１の中心から周囲に向かって同心円状に形成されている。一例として、環内部４１の直径方向に沿った凹状反射部４０３のピッチは約３ｍｍである。また一例として、凹状反射部４０３のＺ方向高さは０．４ｍｍ以上１．０ｍｍ以下である。
尚、凹状反射部４０３のサイズを大きくすると、表面積の増加により凹状反射部４０３で反射される光量が増大する。凹状反射部４０３のサイズが大き過ぎると、拡散光の量も増加する。凹状反射部４０３の真上の下レンズ部５０２及び上レンズ部５０１に光を適切に入射させるために、凹状反射部４０３のサイズは少なくとも真上に位置する上レンズ部５０１の直径を超えない程度にすべきである。 A large number of concave reflection portions 403 are formed in the ring interior 41 (here, a total of 491), and are formed concentrically from the center of the ring interior 41 toward the periphery. As an example, the pitch of the concave reflecting portions 403 along the diameter direction of the inside 41 of the ring is about 3 mm. As an example, the height of the concave reflecting portion 403 in the Z direction is not less than 0.4 mm and not more than 1.0 mm.
If the size of the concave reflection portion 403 is increased, the amount of light reflected by the concave reflection portion 403 increases due to an increase in surface area. If the size of the concave reflecting portion 403 is too large, the amount of diffused light also increases. In order to allow light to properly enter the lower lens unit 502 and the upper lens unit 501 directly above the concave reflection unit 403, the size of the concave reflection unit 403 does not exceed the diameter of the upper lens unit 501 positioned at least directly above. Should be.

尚、環内部４１の主面４０２と集光カバー５０の裏面とには、互いに嵌合可能な微小サイズの凸部と凹部（不図示）とが同順に設けられる。凸部と凹部とは、例えば集光カバー５０の中心Ｏの付近において、互いに約１２０°ずつ円周角を異ならせた３か所の位置に対応して設けられる。これにより導光板４０と集光カバー５０との位置合わせが行われる。   The main surface 402 of the inside 41 of the ring and the back surface of the light collecting cover 50 are provided with convex portions and concave portions (not shown) that can be fitted to each other in the same order. For example, in the vicinity of the center O of the light collecting cover 50, the convex portion and the concave portion are provided corresponding to three positions where the circumferential angles are different from each other by about 120 °. Thereby, alignment with the light-guide plate 40 and the condensing cover 50 is performed.

（ｉｉ）環状部４２
環状部４２は、発光素子２２の出射光を導光板４０側に導光する入光部である。図４に示すように環状部４２は、反射部材３０の凹入部３２と重ねて配置される。これにより環状部４２は、実装基板２０上の各発光素子２２の実装位置に亘るように形成される。
具体的な構成として環状部４２は、図７に示すように、素子対向部４２０と、内側傾斜部４２１Ａと、外側傾斜部４２１Ｂとを有してなる。環状部４２は全体として略Ｖ字断面形状を有する。 (Ii) Annular portion 42
The annular portion 42 is a light incident portion that guides light emitted from the light emitting element 22 toward the light guide plate 40. As shown in FIG. 4, the annular portion 42 is disposed so as to overlap the recessed portion 32 of the reflecting member 30. Thereby, the annular portion 42 is formed so as to extend over the mounting position of each light emitting element 22 on the mounting substrate 20.
As a specific configuration, as shown in FIG. 7, the annular portion 42 includes an element facing portion 420, an inner inclined portion 421A, and an outer inclined portion 421B. The annular portion 42 has a substantially V-shaped cross section as a whole.

素子対向部４２０は、発光素子２２と近接配置される。素子対向部４２０の表面は一例として平坦面である。
内側傾斜部４２１Ａと外側傾斜部４２１Ｂは、素子対向部４２０より遠ざかるにつれて滑らかに傾斜角度が漸増する断面形状を有する。内側傾斜部４２１Ａは環内部４１と連続している。外側傾斜部４２１Ｂは環状外周部４３と連続している。内側傾斜部４２１Ａと外側傾斜部４２１Ｂとは、垂直（Ｚ）方向に対して互いに逆方向に傾斜する。これにより内側傾斜部４２１Ａと外側傾斜部４２１Ｂは、素子対向部４２０より直上（Ｚ）方向に沿って入射した入射光をその内部で同順に環内部４１と環状外周部４３とに効率よく導光させる。 The element facing portion 420 is disposed close to the light emitting element 22. For example, the surface of the element facing portion 420 is a flat surface.
The inner inclined portion 421A and the outer inclined portion 421B have a cross-sectional shape in which the inclination angle gradually increases as the distance from the element facing portion 420 increases. The inner inclined portion 421A is continuous with the ring interior 41. The outer inclined portion 421B is continuous with the annular outer peripheral portion 43. The inner inclined portion 421A and the outer inclined portion 421B are inclined in directions opposite to each other with respect to the vertical (Z) direction. Accordingly, the inner inclined portion 421A and the outer inclined portion 421B efficiently guide incident light incident along the (Z) direction directly above the element facing portion 420 to the inner ring portion 41 and the annular outer peripheral portion 43 in the same order. Let

尚、照明器具１では意匠上の理由により、内側傾斜部４２１ＡのＺ方向高さを外側傾斜部４２１ＢのＺ方向高さより高くしている。内側傾斜部４２１Ａと外側傾斜部４２１ＢのＺ方向高さを揃えることで、照明器具１をさらに薄型化することが可能である。
（ｉｉｉ）環状外周部４３
環状外周部４３は、環状部４２より導光板４０の内部に入射された発光素子２２の光を、発光素子２２の実装位置よりも外側に導光する。 In the lighting fixture 1, the height in the Z direction of the inner inclined portion 421A is made higher than the height in the Z direction of the outer inclined portion 421B for design reasons. By aligning the heights in the Z direction of the inner inclined portion 421A and the outer inclined portion 421B, the lighting fixture 1 can be further reduced in thickness.
(Iii) An annular outer peripheral portion 43
The annular outer peripheral portion 43 guides the light of the light emitting element 22 that has entered the light guide plate 40 from the annular portion 42 to the outside of the mounting position of the light emitting element 22.

図７に示すように、環状外周部４３の裏面４３０には、Ｚ方向に向けて複数の凹状反射部４０４が存在している。凹状反射部４０４は頂角が６０°の円錐体状の凹陥部であり、Ｚ方向高さは凹状反射部４０３と同一である。
［集光カバー５０］
集光カバー５０は、導光板４０からの出射光を集光して前方に出射させる。集光カバー５０は導光板４０の少なくとも一部を覆うように配される集光カバー５０は、全体として透光性に優れる材料、例えばシリコーン樹脂、アクリル樹脂、ポリカーボネート樹脂、ガラス等を用いて構成される。照明器具１において、集光カバー５０は導光板４０と接するように配される。 As shown in FIG. 7, a plurality of concave reflecting portions 404 exist in the Z direction on the back surface 430 of the annular outer peripheral portion 43. The concave reflecting portion 404 is a conical concave portion having an apex angle of 60 °, and the height in the Z direction is the same as that of the concave reflecting portion 403.
[Condensing cover 50]
The condensing cover 50 condenses the emitted light from the light guide plate 40 and emits it forward. The light collecting cover 50 is disposed so as to cover at least a part of the light guide plate 40. The light collecting cover 50 is configured using a material having excellent translucency as a whole, for example, silicone resin, acrylic resin, polycarbonate resin, glass, or the like. Is done. In the luminaire 1, the light collection cover 50 is disposed so as to contact the light guide plate 40.

図９の拡大断面図に示すように、集光カバ−５０は、ベース部５００と、上レンズ部５０１と、下レンズ部５０２とを有する。
（ｉ）ベース部５００
ベース部５００は、ＸＹ方向を平面方向とする板状部である。ベース部５００の主面には上レンズ部５０１が形成される。ベース部５００の裏面には下レンズ部５０２が形成される。ベース部５００の裏面は導光板４０の主面４０２と対向配置される。 As shown in the enlarged sectional view of FIG. 9, the condensing cover 50 includes a base portion 500, an upper lens portion 501, and a lower lens portion 502.
(I) Base unit 500
The base part 500 is a plate-like part whose plane direction is the XY direction. An upper lens portion 501 is formed on the main surface of the base portion 500. A lower lens portion 502 is formed on the back surface of the base portion 500. The back surface of the base unit 500 is disposed to face the main surface 402 of the light guide plate 40.

ベース部５００の板厚Ｄ1はできるだけ薄くすることが望ましい。一例として、ベース部５００の板厚Ｄ1は０．５ｍｍ、レンズピッチＷは３．０５ｍｍである。また、下レンズ部５０２の頂部５０２０ａから上レンズ部５０１の頂部５０１０ａまでの高さＤ2は２．５ｍｍである。
（ｉｉ）上レンズ部５０１
上レンズ部５０１は微小な非球面レンズであり、ベース部５００の上面から上方（Ｚ方向）に形成される。上レンズ部５０１は、光軸上の基準位置からレンズ表面の任意位置までの距離と、基準位置及びレンズ表面の任意位置を通る直線と光軸とのなす角度とを関係付ける関係式により、表面形状が規定される。集光カバー５０において、上レンズ部５０１は導光板４０からの出射光を集光するレンズ部として用いる。上レンズ部５０１は、第１レンズ領域５０１０と、第２レンズ領域５０１１とを有してなる。 It is desirable to make the plate thickness D 1 of the base portion 500 as thin as possible. As an example, the base portion 500 has a plate thickness D 1 of 0.5 mm and a lens pitch W of 3.05 mm. The height D 2 from the top 5020a of the lower lens unit 502 to the top 5010a of the upper lens unit 501 is 2.5 mm.
(Ii) Upper lens unit 501
The upper lens portion 501 is a minute aspheric lens, and is formed upward (Z direction) from the upper surface of the base portion 500. The upper lens unit 501 has a surface expression according to a relational expression that relates a distance from a reference position on the optical axis to an arbitrary position on the lens surface, and an angle formed by a straight line passing through the reference position and the arbitrary position on the lens surface and the optical axis. The shape is defined. In the light condensing cover 50, the upper lens portion 501 is used as a lens portion that condenses the light emitted from the light guide plate 40. The upper lens unit 501 includes a first lens region 5010 and a second lens region 5011.

第１レンズ領域５０１０は、上レンズ部５０１の頂部５０１０ａを含む領域である。第１レンズ領域５０１０は、例えば以下に示す形状を有する。図９のように上レンズ部５０１の光軸に沿った導光板４０中の基準位置Ａから第１レンズ領域５０１０の表面の任意位置までの距離をｒ1、基準位置Ａから上レンズ部５０１の頂部５０１０ａまでの高さをｔ1とする。さらに距離ｒ1を通る直線と第１レンズ領域５０１０の光軸との間の角度をθ1、導光板４０の屈折率をｎとする。このとき、光軸に沿った第１レンズ領域５０１０の断面形状は、以下の関係式１（式１）で規定される。 The first lens region 5010 is a region including the top portion 5010a of the upper lens portion 501. The first lens region 5010 has, for example, the following shape. As shown in FIG. 9, the distance from the reference position A in the light guide plate 40 along the optical axis of the upper lens portion 501 to an arbitrary position on the surface of the first lens region 5010 is r 1 , and the distance from the reference position A to the upper lens portion 501 is the height to the top 5010a and t 1. Further, the angle between the straight line passing through the distance r 1 and the optical axis of the first lens region 5010 is θ 1 , and the refractive index of the light guide plate 40 is n. At this time, the cross-sectional shape of the first lens region 5010 along the optical axis is defined by the following relational expression 1 (Formula 1).

（式１）
ｒ1＝（ｎ−１）×ｔ1／（ｎ−ｃｏｓθ1）
第２レンズ領域５０１１は、上レンズ部５０１の基部５０１１ａを含み且つ、第１レンズ領域５０１０と連続し、第１レンズ領域５０１０よりも緩やかな表面形状を有する。第２レンズ領域５０１１は、例えば以下に示す形状を有する。上レンズ部５０１の光軸に沿った導光板４０中の基準位置Ａから第２レンズ領域５０１１の表面の任意位置までの距離をｒ2、導光板４０の主面に垂直な方向に沿った基準位置Ａから上レンズ部５０１の頂部５０１０ａまでの高さをｔ1とする。さらに距離ｒ2を通る直線と上レンズ部５０１の光軸との間の角度をθ2、ｎを導光板４０の屈折率、ｋ1、ｋ2を正の定数、基準位置Ａから上レンズ部５０１の表面における第１レンズ領域５０１０と第２レンズ領域５０１１との境界を通る直線（距離ｒ0に沿った直線）と上レンズ部５０１の光軸との間の角度をθchとする。このとき第２レンズ領域５０１１の表面形状は、以下の第２関係式（式２）で規定される。 (Formula 1)
r 1 = (n−1) × t 1 / (n−cos θ 1 )
The second lens region 5011 includes the base portion 5011 a of the upper lens portion 501, is continuous with the first lens region 5010, and has a more gentle surface shape than the first lens region 5010. The second lens region 5011 has, for example, the following shape. The distance from the reference position A in the light guide plate 40 along the optical axis of the upper lens portion 501 to an arbitrary position on the surface of the second lens region 5011 is r 2 , and the reference is along the direction perpendicular to the main surface of the light guide plate 40. A height from the position A to the top 5010a of the upper lens portion 501 is defined as t 1 . Further, the angle between the straight line passing through the distance r 2 and the optical axis of the upper lens portion 501 is θ 2 , n is the refractive index of the light guide plate 40, k 1 and k 2 are positive constants, and the upper lens portion from the reference position A An angle between a straight line (straight line along the distance r 0 ) passing through the boundary between the first lens region 5010 and the second lens region 5011 on the surface of 501 and the optical axis of the upper lens unit 501 is θ ch . At this time, the surface shape of the second lens region 5011 is defined by the following second relational expression (Formula 2).

（式２）
ｒ2＝（ｎ−１）｛ｔ1＋ｋ1（θ2−θch）k2／（ｎ−ｃｏｓθ2）
第２関係式（式２）で第２レンズ領域５０１１の表面形状を規定することにより、第２レンズ領域５０１１を第１関係式で規定した場合に比べ、基準位置Ａから第２レンズ領域５０１１の表面の任意位置までの距離が長くなる。ここでは一例として、ｔ2＞ｔ1となる第２レンズ領域５０１１の基準高さをｔ2とし、ｋ2＝１、ｋ1＝（ｔ2−ｔ1）／（ｃｏｓ-1（１／ｎ）−θch）とした。 (Formula 2)
r 2 = (n−1) {t 1 + k 1 (θ 2 −θ ch ) k 2 / (n−cos θ 2 )
By defining the surface shape of the second lens region 5011 with the second relational expression (Formula 2), the second lens region 5011 is defined from the reference position A to the second lens region 5011 as compared with the case where the second lens region 5011 is defined with the first relational expression. The distance to an arbitrary position on the surface becomes longer. Here, as an example, the reference height of the second lens region 5011 where t 2 > t 1 is t 2, and k 2 = 1, k 1 = (t 2 −t 1 ) / (cos −1 (1 / n ) −θ ch ).

図１０は、第１レンズ領域５０１０と第２レンズ領域５０１１の各表面形状を示すグラフであり、光軸（縦軸）に沿った上レンズ部５０１の表面形状の一部を示す。縦軸のレンズ高さと横軸のレンズ半径（ｒ）とはそれぞれ相対値で示している。境界Ｑの位置は、θch＝２５°となる位置としている。ここで、第２レンズ領域５０１１の表面（実線で示される部分）は、表面形状を第１関係式で規定したときの第２レンズ領域５０１１の表面（点線Ｖで示される部分）に比べて外側に位置する。 FIG. 10 is a graph showing the surface shapes of the first lens region 5010 and the second lens region 5011, and shows a part of the surface shape of the upper lens portion 501 along the optical axis (vertical axis). The lens height on the vertical axis and the lens radius (r) on the horizontal axis are shown as relative values. The position of the boundary Q is a position where θ ch = 25 °. Here, the surface of the second lens region 5011 (portion indicated by the solid line) is outside the surface of the second lens region 5011 (portion indicated by the dotted line V) when the surface shape is defined by the first relational expression. Located in.

図１０に示すように、θchの角度を変化させ、境界Ｑの位置を縦軸に沿ったいずれかの方向に移動させることにより、上レンズ部５０１の第１レンズ領域５０１０の高さｈ3と、第２レンズ領域５０１１の高さｈ4との比率を調整できる。θchの角度を小さくすることにより、上レンズ部５０１の表面で正反射する光の割合を小さくすることが可能となるが、配光角度０°における放射強度が下がり、１／２ビーム角度も大きくなる。θchの適正角度は導光板４０の厚みと凹状反射部４０３の大きさに起因する。例えば導光板４０の厚みが１．５ｍｍで凹状反射部４０３の径がφ０．９ｍｍの場合、θchの角度を２０°以上にすることにより、第１レンズ領域５０１０の表面で正反射する光は存在しなくなる。また、図９に示したｔ2の値を大きくすることにより、上レンズ部５０１の表面で正反射する光の割合を小さくすることが可能となるが、配光角度０°における放射強度が下がり、１／２ビーム角度も大きくなる。 As shown in FIG. 10, the height h 3 of the first lens region 5010 of the upper lens portion 501 is changed by changing the angle of θ ch and moving the position of the boundary Q in any direction along the vertical axis. And the height h 4 of the second lens region 5011 can be adjusted. By reducing the angle of θ ch , it is possible to reduce the proportion of light that is regularly reflected on the surface of the upper lens portion 501, but the radiation intensity at a light distribution angle of 0 ° is reduced, and the 1/2 beam angle is also reduced. growing. The appropriate angle of θ ch is due to the thickness of the light guide plate 40 and the size of the concave reflecting portion 403. For example, when the thickness of the light guide plate 40 is 1.5 mm and the diameter of the concave reflecting portion 403 is φ0.9 mm, the light that is regularly reflected on the surface of the first lens region 5010 is increased by setting the angle of θ ch to 20 ° or more. No longer exists. Further, by increasing the value of t 2 shown in FIG. 9, it is possible to reduce the proportion of light that is regularly reflected on the surface of the upper lens portion 501, but the radiation intensity at a light distribution angle of 0 ° decreases. The 1/2 beam angle is also increased.

上記より、θchの値は２０°〜３０°の範囲が効果的であり、本実施形態ではθch＝２５°とした。またｔ2は１＜ｔ2／ｔ1＜１．１の範囲が効果的であり、本実施形態ではｔ1＝３．９ｍｍに対してｔ2／ｔ1＝１．０５とした。
（ｉｉｉ）下レンズ部５０２
下レンズ部５０２は微小な非球面レンズ（凸レンズ）であり、上レンズ部５０１の第２レンズ領域５０１１よりも曲率が大きい。下レンズ部５０２は導光板４０からの出射光を上レンズ部５０１で集光する際、集光カバー５０内で正反射を繰り返す光を低減し、集光特性を向上させるための補助レンズとして用いられる。下レンズ部５０２は導光板４０と対向配置されるベース部５００の裏面に形成される。 From the above, the value of θ ch is effective in the range of 20 ° to 30 °, and θ ch = 25 ° in this embodiment. Further, t 2 is effective in the range of 1 <t 2 / t 1 <1.1. In this embodiment, t 2 / t 1 = 1.05 with respect to t 1 = 3.9 mm.
(Iii) Lower lens unit 502
The lower lens unit 502 is a minute aspheric lens (convex lens), and has a larger curvature than the second lens region 5011 of the upper lens unit 501. The lower lens unit 502 is used as an auxiliary lens for reducing light that repeats regular reflection in the condensing cover 50 and improving condensing characteristics when the light emitted from the light guide plate 40 is collected by the upper lens unit 501. It is done. The lower lens portion 502 is formed on the back surface of the base portion 500 disposed to face the light guide plate 40.

下レンズ部５０２は、例えば以下の関係式が成立する形状を有する。図１１は、下レンズ部５０２の表面形状を示すグラフである。下レンズ部５０２の光軸に沿った集光カバー５０の下方向の基準位置Ｂから下レンズ部５０２の表面の任意位置までの下レンズ部５０２の距離をｒ3、基準位置Ｂから下レンズ部５０２の頂部５０２０ａまでの距離をｔ3とする。さらに導光板４０の屈折率をｎ、下レンズ部５０２の光軸（軸Ｐ）と距離ｒ3を通る直線との間の角度をθ3とする。このとき下レンズ部５０２では、以下の第３関係式（式３）が成立する。 The lower lens unit 502 has a shape that satisfies the following relational expression, for example. FIG. 11 is a graph showing the surface shape of the lower lens unit 502. The distance of the lower lens portion 502 from the reference position B in the lower direction of the light collecting cover 50 along the optical axis of the lower lens portion 502 to an arbitrary position on the surface of the lower lens portion 502 is r 3 , and the lower lens portion from the reference position B 502 the distance to the top 5020a and t 3 of. Further, the refractive index of the light guide plate 40 is n, and the angle between the optical axis (axis P) of the lower lens portion 502 and a straight line passing through the distance r 3 is θ 3 . At this time, in the lower lens unit 502, the following third relational expression (Expression 3) is established.

（式３）
ｒ3＝（ｎ−１）×ｔ3×ｃｏｓθ3／（（ｎ×ｃｏｓ−１）×√ｎ2−ｓｉｎ2θ3）
下レンズ部５０２の高さ（図９に示すＤ2−（ｈ3＋ｈ4））は、一例として（０．２）ｍｍである。また、下レンズ部５０２のｔ3値は一例としてｔ3＝８０ｍｍである。ｔ3値が小さい場合、ｔ1値の適正値が小さくなり、レンズピッチが小さくなる。これにより、隣のレンズに入射される光の割合が増大するため、ｔ3値としては出来るだけ大きい値が望まれる。 (Formula 3)
r 3 = (n−1) × t 3 × cos θ 3 / ((n × cos−1) × √n 2 −sin 2 θ 3 )
The height of the lower lens portion 502 (D 2 − (h 3 + h 4 ) shown in FIG. 9) is (0.2) mm as an example. The t 3 value of the lower lens unit 502 is t 3 = 80 mm as an example. When the t 3 value is small, the appropriate value of the t 1 value is small and the lens pitch is small. As a result, the ratio of the light incident on the adjacent lens increases, so that a value as large as possible is desired as the t 3 value.

尚、発明者らの検討によれば、集光カバー５０と導光板４０とを接するように配置し、集光カバー５０と導光板４０との距離を０ｍｍとすることが望ましい。この構成によれば、上レンズ部５０１と下レンズ部５０２のレンズ形状を調整することで、１／２ビーム角を１０°以下１００°以上の範囲に制御できる。
（ｉｖ）集光カバー５０の全体的形状
照明器具１において、上レンズ部５０１と下レンズ部５０２とは導光板４０の凹状反射部４０３の各々と個別に光学的な対向関係を保って配置される。さらに集光カバー５０において、上レンズ部５０１と下レンズ部５０２とは、各光軸が集光カバー５０の厚み（Ｚ）方向に沿った軸Ｐ上に重なるように、ベース部５００を挟んで個別に対応する位置に配置される（図８）。 According to the studies by the inventors, it is desirable that the light collecting cover 50 and the light guide plate 40 are disposed so as to contact each other, and the distance between the light collecting cover 50 and the light guide plate 40 is set to 0 mm. According to this configuration, by adjusting the lens shapes of the upper lens portion 501 and the lower lens portion 502, the ½ beam angle can be controlled within a range of 10 ° or less and 100 ° or more.
(Iv) Overall shape of the condensing cover 50 In the luminaire 1, the upper lens portion 501 and the lower lens portion 502 are disposed in an optically opposing relationship with each of the concave reflecting portions 403 of the light guide plate 40. The Further, in the light collecting cover 50, the upper lens portion 501 and the lower lens portion 502 sandwich the base portion 500 so that each optical axis overlaps with the axis P along the thickness (Z) direction of the light collecting cover 50. They are individually arranged at corresponding positions (FIG. 8).

集光カバー５０を作製する際、ベース部５００と、上レンズ部５０１と、下レンズ部５０２とは一体的に射出成形される。図３に示すように、上レンズ部５０１は多数（ここでは４９１個）にわたり、集光カバー５０の中央点Ｏから周縁に向けて同心円状に密集して形成される。ＸＹ平面に沿った各上レンズ部５０１のピッチと各下レンズ部５０２のピッチは、いずれも一例として３．０５ｍｍである。ここで図９のように導光板４０の板厚をＤ3とし、図８のように隣接する上レンズ部５０１のピッチ（下レンズ部５０２のピッチ）をＷとするとき、板厚Ｄ3及びレンズピッチＷは１．５≦Ｗ／Ｄ≦２．５の関係が成立するように設定される。
［拡散カバー６０］
拡散カバー６０は、導光板４０の環状外周部４３からの出射光を散乱光とする。拡散カバー６０は透光性材料、例えばシリコーン樹脂、アクリル樹脂、ポリカーボネート樹脂、ガラス等を用いて構成される。 When the light collecting cover 50 is manufactured, the base unit 500, the upper lens unit 501, and the lower lens unit 502 are integrally injection-molded. As shown in FIG. 3, a large number (up to 491 in this case) of the upper lens portions 501 are densely formed concentrically from the central point O to the peripheral edge of the light collecting cover 50. As an example, the pitch of each upper lens unit 501 and the pitch of each lower lens unit 502 along the XY plane is 3.05 mm. Here, when the plate thickness of the light guide plate 40 is D 3 as shown in FIG. 9 and the pitch of the adjacent upper lens portions 501 (the pitch of the lower lens portion 502) is W as shown in FIG. 8, the plate thickness D 3 and The lens pitch W is set so that the relationship of 1.5 ≦ W / D ≦ 2.5 is established.
[Diffusion cover 60]
The diffusion cover 60 uses light emitted from the annular outer peripheral portion 43 of the light guide plate 40 as scattered light. The diffusion cover 60 is configured using a translucent material such as a silicone resin, an acrylic resin, a polycarbonate resin, or glass.

具体的構成としては図３と図４とに示すように、拡散カバー６０は本体部６１と、側壁部６２とを有する。
本体部６１は円環状であり、光散乱処理が施されて導光板４０からの出射光を効率よく散乱する。光散乱処理としては、例えば導光板４０と対向する本体部６１の表面を微細に凹凸処理する。本体部６１は導光板４０の環状外周部４３を覆うように配される。本体部６１の中央に存在する開口６３からは、集光カバー５０の上レンズ部５０１が外部露出される。開口６３の直径は、一例として約８０ｍｍである。 Specifically, as shown in FIGS. 3 and 4, the diffusion cover 60 has a main body 61 and a side wall 62.
The main body 61 has an annular shape, and is subjected to a light scattering process to efficiently scatter the light emitted from the light guide plate 40. As the light scattering process, for example, the surface of the main body 61 that faces the light guide plate 40 is subjected to a fine uneven process. The main body 61 is arranged so as to cover the annular outer peripheral portion 43 of the light guide plate 40. From the opening 63 present at the center of the main body 61, the upper lens portion 501 of the light collecting cover 50 is exposed to the outside. The diameter of the opening 63 is about 80 mm as an example.

側壁部６２は本体部６１の周縁に配される。側壁部６２はベース１０のフランジ部１２と接合される。
（照明装置１００の基本動作）
以上の構成を有する照明装置１００に電源投入すると、商業用電源に接続された電源ユニット４から配線２３を介して各発光素子２２に電力供給がなされる。これにより各発光素子２２が駆動される。各発光素子２２で生じた出射光は、反射部材３０の各開口３４を介して環状部４２より導光板４０に入射する。入射光は導光板４０の板内で正反射を繰り返し、環内部４１と環状外周部４３の両方に導光される。導光板４０より下方に漏れ出た戻り光は反射部材３０の上面３１０、３２０において反射され、導光板４０に再度入射される。 The side wall 62 is disposed on the periphery of the main body 61. The side wall portion 62 is joined to the flange portion 12 of the base 10.
(Basic operation of lighting device 100)
When the lighting device 100 having the above configuration is turned on, power is supplied to each light emitting element 22 from the power supply unit 4 connected to the commercial power supply via the wiring 23. Thereby, each light emitting element 22 is driven. The emitted light generated by each light emitting element 22 enters the light guide plate 40 from the annular portion 42 through each opening 34 of the reflecting member 30. Incident light repeats regular reflection within the light guide plate 40 and is guided to both the ring inner portion 41 and the annular outer peripheral portion 43. The return light leaking downward from the light guide plate 40 is reflected by the upper surfaces 310 and 320 of the reflecting member 30 and is incident on the light guide plate 40 again.

導光板４０の環内部４１に導光された発光素子２２の出射光は、凹状反射部４０３において真上（Ｚ）方向またはその近傍方向に反射され、各凹状反射部４０３の真上に位置する下レンズ部５０２と上レンズ部５０１とに順次入射される。入射光は下レンズ部５０２と上レンズ部５０１で集光される。凹状反射部４０３の中心付近から下レンズ部５０２と上レンズ部５０１とに入射された光は、平行光として出射される。凹状反射部４０３の中心より離れた位置から下レンズ部５０２と上レンズ部５０１とに入射された光は、軸Ｐに対してやや傾斜した方向に集光される。このように集光された光は距離約２０００ｍｍ先にある照射面において、配光角±約５°以内に照度ピークを有する狭配向の照明光となる。   The light emitted from the light emitting element 22 guided to the ring interior 41 of the light guide plate 40 is reflected by the concave reflecting portion 403 in the direction directly above (Z) or in the vicinity thereof, and is positioned directly above each concave reflecting portion 403. The light is sequentially incident on the lower lens unit 502 and the upper lens unit 501. Incident light is collected by the lower lens unit 502 and the upper lens unit 501. Light incident on the lower lens unit 502 and the upper lens unit 501 from the vicinity of the center of the concave reflection unit 403 is emitted as parallel light. Light incident on the lower lens unit 502 and the upper lens unit 501 from a position away from the center of the concave reflecting unit 403 is collected in a direction slightly inclined with respect to the axis P. The light thus collected becomes narrowly oriented illumination light having an illuminance peak within a light distribution angle of ± 5 ° on the irradiated surface at a distance of about 2000 mm.

一方、導光板４０の環状外周部４３に導光された発光素子２２の出射光は、凹状反射部４０４において厚み（Ｚ）方向またはその近傍方向に反射される。その後、出射光は上方の拡散カバー６０に入射される。入射光は光散乱処理された本体部６１で拡散され、外部に出射される。
（照明装置１００で奏される効果）
照明装置１００では、主として以下の諸効果を期待できる。 On the other hand, the emitted light of the light emitting element 22 guided to the annular outer peripheral portion 43 of the light guide plate 40 is reflected in the thickness (Z) direction or the vicinity thereof by the concave reflection portion 404. Thereafter, the emitted light is incident on the upper diffusion cover 60. Incident light is diffused by the light scattering-processed main body 61 and emitted to the outside.
(Effects produced by lighting device 100)
In the lighting device 100, the following effects can be expected mainly.

［１］上レンズ部５０１により奏される効果
図１２に、比較例の集光カバー５０Ａを用いた場合の様子を示す。集光カバー５０Ａは、単一の焦点距離の上レンズ部５０１Ａを有する。図１２中、導光板４０の主面として裏面４０１Ａと、主面４０２Ａとを示す。上レンズ部５０１Ａの曲率は第１レンズ領域５０１０の曲率と同一である。また上レンズ部５０１ＡのＺ方向高さは上レンズ部５０１の高さ（ｈ3＋ｈ4）と同一である。 [1] Effects exhibited by the upper lens portion 501 FIG. 12 shows a state in which the light collecting cover 50A of the comparative example is used. The condensing cover 50A has an upper lens portion 501A having a single focal length. In FIG. 12, a back surface 401A and a main surface 402A are shown as the main surface of the light guide plate 40. The curvature of the upper lens portion 501A is the same as the curvature of the first lens region 5010. The height of the upper lens portion 501A in the Z direction is the same as the height (h 3 + h 4 ) of the upper lens portion 501.

集光カバー５０Ａを用いると、レンズ焦点Ｃより照射された光は、上レンズ部５０１Ａの表面で屈折し、Ｌａのように光軸に対して平行に放射される。しかしながら、レンズ焦点Ｃよりずれた位置から照射し、上レンズ部５０１Ａの表面に当たった光Ｌ3は、上レンズ部５０１Ａの表面への入射角θ3が大きいために正反射を繰り返し、導光板４０Ａに入射される戻り光となる場合がある。また同様に、上レンズ部５０１Ａの表面への入射角θ4が大きいために、上レンズ部５０１Ａから周囲に拡散する光Ｌ4が発生する場合がある。 When the condensing cover 50A is used, the light irradiated from the lens focal point C is refracted on the surface of the upper lens portion 501A and is emitted parallel to the optical axis like La. However, the light L 3 irradiated from a position shifted from the lens focal point C and hits the surface of the upper lens portion 501A repeats regular reflection because the incident angle θ 3 to the surface of the upper lens portion 501A is large, and the light guide plate In some cases, the return light is incident on 40A. Similarly, since the incident angle θ 4 on the surface of the upper lens portion 501A is large, light L 4 that diffuses from the upper lens portion 501A to the surroundings may be generated.

これらの問題に対し、集光カバー５０を用いることで奏される効果を図１３に示す。上レンズ部５０１において、第２レンズ領域５０１１の曲率は第１レンズ領域５０１０の曲率よりも小さい。第２レンズ領域５０１１の表面は第１レンズ領域５０１０の表面よりも緩やかに傾斜している。従って、図１２に示したＬ3やＬ4のように進行する光を第２レンズ領域５０１１に入射させた場合には、入射の際の入射角を小さく抑制し、正反射を防止できる。図１３では、光Ｌ3やＬ4と同じ方向より進行する光Ｌ5、Ｌ6が、図１２の入射角θ3、θ4よりも小さな入射角θ5、θ6で第２レンズ領域５０１１にそれぞれ入射される様子を示す。光Ｌ5、Ｌ6は外部に突き抜け、真上方向またはその近傍方向に向けて出射される。但し、レンズ焦点Ｃより照射された光は、上レンズ部５０１Ａの表面で屈折し、Ｌａのように光軸に対して少し外に広がった方向に放射される。 FIG. 13 shows the effects obtained by using the light collecting cover 50 for these problems. In the upper lens portion 501, the curvature of the second lens region 5011 is smaller than the curvature of the first lens region 5010. The surface of the second lens region 5011 is inclined more gently than the surface of the first lens region 5010. Therefore, when light traveling as indicated by L 3 and L 4 shown in FIG. 12 is incident on the second lens region 5011, the incident angle at the time of incidence can be suppressed to be small and regular reflection can be prevented. In FIG. 13, the light L 5 and L 6 traveling in the same direction as the light L 3 and L 4 are incident on the second lens region 5011 at incident angles θ 5 and θ 6 smaller than the incident angles θ 3 and θ 4 in FIG. Fig. 2 shows how each is incident. The lights L 5 and L 6 penetrate outside and are emitted directly upward or in the vicinity thereof. However, the light emitted from the lens focal point C is refracted on the surface of the upper lens portion 501A, and is emitted in a direction that extends slightly outward with respect to the optical axis, such as La.

さらに集光カバー５０では、第２レンズ領域５０１１の上に第１レンズ領域５０１０を位置させることで、第２レンズ領域５０１１の内側から上レンズ部５０１に入射する光Ｌ7を十分に小さな入射角θ7で入射させることができる。この光Ｌ7は第１レンズ領域５０１０から外部に突き抜け、真上方向またはその近傍方向に向けて出射される。このように第２レンズ領域５０１１から外部に出射させる光と、上レンズ部５０１の頂部５０１０ａを含む第１レンズ領域５０１０から外部に出射される光とにより、導光板４０の主面に垂直な主出射方向（Ｚ方向）に光を集光して効率よく出射できる。結果として、優れた狭配向の集光特性を得ることが可能な照明装置１００を提供できる。 Further, in the light collecting cover 50, the first lens region 5010 is positioned on the second lens region 5011, so that the light L 7 incident on the upper lens unit 501 from the inside of the second lens region 5011 is sufficiently small in incident angle. Incident light can be incident at θ 7 . The light L 7 penetrates from the first lens region 5010 to the outside and is emitted in the direction directly above or in the vicinity thereof. As described above, the light emitted to the outside from the second lens region 5011 and the light emitted to the outside from the first lens region 5010 including the top 5010a of the upper lens portion 501 are mainly perpendicular to the main surface of the light guide plate 40. Light can be efficiently emitted by condensing light in the emission direction (Z direction). As a result, it is possible to provide the illuminating device 100 capable of obtaining excellent narrow orientation light collecting characteristics.

［２］導光板４０の板厚により奏される効果
図１４に、比較例の導光板４０Ｂ及び集光カバー５０Ｂを用いた場合の様子を示す。導光板４０Ｂの板厚Ｄ4は、導光板４０板厚Ｄ3よりも厚い。上レンズ部５０１Ｂの曲率は図１０の上レンズ部５０１Ａと同一である。また上レンズ部５０１ＢのＺ方向高さは上レンズ部５０１の高さ（ｈ3＋ｈ4）と同一である。この場合、上レンズ部５０１Ｂの表面で正反射した光Ｌ8が戻り光となり、斜め方向より導光板４０Ｂに入射されることがある。このとき、導光板４０Ｂ内の光路が比較的長いために、光Ｌが導光板４０Ｂの裏面４０１Ｂで反射されて別の上レンズ部５０１Ｂに入射されることにより、拡散光となるおそれがある。 [2] Effect produced by the thickness of the light guide plate 40 FIG. 14 shows a state in which the light guide plate 40B and the light collecting cover 50B of the comparative example are used. The thickness D 4 of the light guide plate 40B is thicker than the thickness D 3 of the light guide plate 40. The curvature of the upper lens portion 501B is the same as that of the upper lens portion 501A in FIG. The height of the upper lens portion 501B in the Z direction is the same as the height (h 3 + h 4 ) of the upper lens portion 501. In this case, the light L 8 was regularly reflected by the surface of the upper lens portion 501B becomes return light, which may be incident from the light guide plate 40B oblique direction. At this time, since the optical path in the light guide plate 40B is relatively long, the light L may be reflected by the back surface 401B of the light guide plate 40B and incident on another upper lens portion 501B, resulting in diffused light.

この問題に対し、導光板４０の板厚により奏される効果を図１５に示す。照明装置１００では、導光板４０の板厚Ｄ3に対する上レンズ部５０１のピッチ（下レンズ部５０２のピッチ）Ｗが１．５≦Ｗ／Ｄ3≦２．５を満たすように設定されるので、この範囲で上レンズ部５０１のピッチ（下レンズ部５０２のピッチ）Ｗと導光板４０の板厚Ｄ3とを小さくできる。これにより厚み（Ｚ）方向付近に沿った導光板４０の光路を短くできる。 FIG. 15 shows the effect produced by the thickness of the light guide plate 40 for this problem. In the illuminating device 100, the pitch W of the upper lens portion 501 (pitch of the lower lens portion 502) W with respect to the plate thickness D 3 of the light guide plate 40 is set so as to satisfy 1.5 ≦ W / D 3 ≦ 2.5. , it can be reduced and thickness D 3 of the pitch (the pitch of the lower lens portion 502) W and the light guide plate 40 of the upper lens portion 501 in this range. Thereby, the optical path of the light guide plate 40 along the thickness (Z) direction vicinity can be shortened.

ここで図１５に示すように、光Ｌ8と同じ方向に進行し、上レンズ部５０１の表面で正反射した光Ｌ9を想定する。光Ｌ9が戻り光となって斜め方向より導光板４０Ｂに入射された場合、導光板４０内の光路が短いと、光Ｌ9は導光板４０の裏面４０１で反射されたのち、再度、真上の上レンズ部５０１に入射され易くなる。これにより光Ｌ9が拡散光となるのを防ぎ、光Ｌ9を照射光として有効利用できる。尚、発明者らの行った実験によれば、導光板４０の板厚Ｄ3を１．５ｍｍから１．２ｍｍまで薄くすると、光取り出し効率が１０％程度向上することが確認された。従って作製可能な範囲において、導光板４０の板厚Ｄ3を薄くすることが望ましい。 Here, as shown in FIG. 15, a light L 9 that travels in the same direction as the light L 8 and is regularly reflected by the surface of the upper lens portion 501 is assumed. When the light L 9 enters the light guide plate 40B from an oblique direction as return light, if the light path in the light guide plate 40 is short, the light L 9 is reflected by the back surface 401 of the light guide plate 40 and then again true. It becomes easy to enter the upper lens unit 501. As a result, the light L 9 can be prevented from becoming diffused light, and the light L 9 can be effectively used as irradiation light. According to experiments conducted by the inventors, it was confirmed that when the thickness D 3 of the light guide plate 40 is reduced from 1.5 mm to 1.2 mm, the light extraction efficiency is improved by about 10%. Therefore, in manufacturing the extent possible, it is desirable to reduce the thickness D 3 of the light guide plate 40.

また、上レンズ部５０１の径が２．７ｍｍ以上の場合、板厚Ｄ1を０．５ｍｍとすると、光Ｌ8のような拡散光を効果的に防止できる。レンズ製作上の課題を考慮しなければ、板厚Ｄ1が小さいほど拡散光を効果的に防止できる。一方、上レンズ部５０１に対する光の入射角が全反射角に近くなると透過率が低くなるのを避ける目的で、上レンズ部５０１の径を２．７ｍｍ以下としてもよい。 When the diameter of the upper lens portion 501 is 2.7 mm or more, diffused light such as light L 8 can be effectively prevented by setting the plate thickness D 1 to 0.5 mm. Without considering challenges lens fabrication, it is possible to effectively prevent diffusion light enough thickness D 1 is small. On the other hand, the diameter of the upper lens portion 501 may be 2.7 mm or less for the purpose of avoiding a decrease in transmittance when the incident angle of light with respect to the upper lens portion 501 is close to the total reflection angle.

以上の各効果を奏することにより、照明装置１００では配光角０°付近に照度が集中する照度分布を実現できる。よって、優れた集光特性を得ることが可能な照明装置１００を提供できる。
［３］照明装置１００の薄型化に関する効果
図１９に示した従来の照明装置８００では、例えば照度分布において光度が最大光度の１／２以上となる角度範囲の配向角（以下、「１／２ビーム角」と称する。）を±４５°以内に設定する場合、蛍光体層８０２２の径を６０ｍｍとすると、フレネルレンズ８０３の径は１６２ｍｍとなる。このとき、発光素子８０２１とフレネルレンズ８０３との間の光路（距離ｈ1）として２７ｍｍを確保しなければならない。これにより照明装置８００において薄型化を図ることは困難である。 By producing the above effects, the illumination device 100 can realize an illuminance distribution in which the illuminance is concentrated in the vicinity of a light distribution angle of 0 °. Therefore, the illuminating device 100 which can acquire the outstanding condensing characteristic can be provided.
[3] Effect Regarding Thinning of Lighting Device 100 In the conventional lighting device 800 shown in FIG. 19, for example, the orientation angle (hereinafter referred to as “1/2”) in an angular range in which the luminous intensity is ½ or more of the maximum luminous intensity in the illuminance distribution. When the angle of the phosphor layer 8022 is 60 mm, the diameter of the Fresnel lens 803 is 162 mm. At this time, 27 mm must be secured as an optical path (distance h 1 ) between the light emitting element 8021 and the Fresnel lens 803. Accordingly, it is difficult to reduce the thickness of the lighting device 800.

これに対して照明装置１００では、各凹状反射部４０３の真上（Ｚ）方向に位置する上レンズ部５０１及び下レンズ部５０２に対し、各凹状反射部４０３より近距離より平行光を入射できる。従って図７に示すように、照明器具１の厚み（Ｚ）方向における発光素子２２と集光カバー５０との間の光路（距離ｈ2）を比較的短くできる。これにより照明器具１の厚みを１８ｍｍ程度以下にまで抑制でき、照明装置１００の薄型化を良好に図ることが可能である。
＜性能確認＞
照明装置１００の性能を確認するため、照度分布における配光特性についてシミュレーションによる計算を行った。 On the other hand, in the lighting device 100, parallel light can be incident on the upper lens unit 501 and the lower lens unit 502 positioned in the directly above (Z) direction of each concave reflection unit 403 from a shorter distance than each concave reflection unit 403. . Therefore, as shown in FIG. 7, the optical path (distance h 2 ) between the light emitting element 22 and the light collecting cover 50 in the thickness (Z) direction of the lighting fixture 1 can be made relatively short. Thereby, the thickness of the lighting fixture 1 can be suppressed to about 18 mm or less, and it is possible to aim at thickness reduction of the illuminating device 100 favorably.
<Performance confirmation>
In order to confirm the performance of the lighting device 100, a light distribution characteristic in the illuminance distribution was calculated by simulation.

実施例として照明装置１００を用いた。比較例として、集光カバーに単一の焦点距離を有する上レンズ部を設けたこと以外は実施例と同一構成の照明装置を用いた。実施例と比較例とでは、いずれも集光カバーのベース部の厚みを０．５ｍｍ、ベース部上面からの上レンズ部の高さを１．８ｍｍ、ベース部裏面からの下レンズ部の高さを０．２ｍｍとした。実施例では、第１レンズ領域５０１０と第２レンズ領域５０１１の切り替わり角度θch＝２５°とした。実施例と比較例の照射面の位置は無限遠に設定した。 The lighting device 100 was used as an example. As a comparative example, an illumination device having the same configuration as that of the example was used except that the upper lens portion having a single focal length was provided on the light collecting cover. In both the example and the comparative example, the thickness of the base portion of the light collecting cover is 0.5 mm, the height of the upper lens portion from the upper surface of the base portion is 1.8 mm, and the height of the lower lens portion from the back surface of the base portion Was 0.2 mm. In the embodiment, the switching angle θ ch = 25 ° between the first lens region 5010 and the second lens region 5011 is set. The positions of the irradiation surfaces of the example and the comparative example were set to infinity.

図１６は、実施例と比較例の照度分布における配光特性についてのシミュレーション結果を直交座標における１８０°配向分布で示したグラフである。図１７は図１６における配向角度±３０°以内の曲線を拡大したグラフである。図１６、図１７の縦軸は対数表示の照射強度とした。図１８はシミュレーション結果に基づき算出した、実施例と比較例の±１０°及び±２０°の範囲の光束を比較したグラフである。   FIG. 16 is a graph showing a simulation result of the light distribution characteristics in the illuminance distributions of the example and the comparative example as a 180 ° orientation distribution in orthogonal coordinates. FIG. 17 is a graph obtained by enlarging the curve within the orientation angle ± 30 ° in FIG. The vertical axis | shaft of FIG. 16, FIG. 17 was made into the irradiation intensity | strength of logarithm display. FIG. 18 is a graph comparing light fluxes in the range of ± 10 ° and ± 20 ° between the example and the comparative example calculated based on the simulation result.

図１６を見ると、比較例では配向角±７０°付近において、照射強度が急激に高くなり、ピークが見られる。さらに図１７の結果を見ると、比較例では配向角±１０°付近においても照射強度に若干のピークが見られる。配向角±７０°付近のピークは、図１２に示したような、レンズ表面で正反射し、対峙した面から放射されたＬ4の光に起因するものと推測される。このようなピークは照射面において不要なリング光を形成し、集光特性を低下させる原因になる。 Referring to FIG. 16, in the comparative example, the irradiation intensity is rapidly increased and a peak is observed in the vicinity of the orientation angle ± 70 °. Further, when the result of FIG. 17 is seen, in the comparative example, a slight peak is observed in the irradiation intensity even in the vicinity of the orientation angle ± 10 °. The peak in the vicinity of the orientation angle ± 70 ° is presumed to be caused by L 4 light that is regularly reflected on the lens surface as shown in FIG. Such a peak forms unnecessary ring light on the irradiated surface and causes a reduction in light collection characteristics.

これに対し実施例では、図１６に示す配向角±３０°〜±９０°の範囲においては比較例のような目立ったピークは見られず、配向角の絶対値の増大に伴って照射強度が連続的に滑らかに低下している。また図１７に示すように、配向角がおよそ±３°以上から±２３°以下の配光角度の範囲内において、比較例よりも照射強度が高くなっているが、比較例のような不要なピークは見られない。このため、実施例ではリング光の形成が比較例よりも抑制されている。   On the other hand, in the example, in the range of the orientation angle ± 30 ° to ± 90 ° shown in FIG. 16, no conspicuous peak as in the comparative example is seen, and the irradiation intensity increases with the increase in the absolute value of the orientation angle. It decreases continuously and smoothly. Further, as shown in FIG. 17, the irradiation intensity is higher than that of the comparative example in the range of the light distribution angle where the orientation angle is about ± 3 ° or more and ± 23 ° or less. No peak is seen. For this reason, in an Example, formation of ring light is suppressed rather than a comparative example.

図１８の結果では、実施例は配向角が±１０°範囲及び±２０°範囲のいずれにおいても比較例より高い光束を呈している。このような結果が得られた理由として、実施例では上レンズ部５０１を第１レンズ領域５０１０と第２レンズ領域５０１１の組み合わせで構成したことにより、出射光が効率よく光軸方向に放射され、配向角±２０°以内における光束が増加したものと推測される。
＜その他の事項＞
本発明に係る照明装置は、埋設型のシーリングライトに限定されない。例えば造営材の表面に設置されるシーリングライトであってもよい。また、ダウンライト、バックライトなど、照明用途の全般に広く利用可能である。 In the results of FIG. 18, the example exhibits a higher luminous flux than the comparative example in both the ± 10 ° and ± 20 ° orientation angles. As a reason why such a result is obtained, in the embodiment, the upper lens portion 501 is configured by a combination of the first lens region 5010 and the second lens region 5011, so that the emitted light is efficiently radiated in the optical axis direction, It is presumed that the luminous flux increased within an orientation angle of ± 20 °.
<Other matters>
The lighting device according to the present invention is not limited to a buried ceiling light. For example, a ceiling light installed on the surface of the construction material may be used. Moreover, it can be widely used for general lighting applications such as downlights and backlights.

本発明において、掛止部材３は必須ではない。照明器具１はネジ止めやリベット、接着等を用いて造営材に固定してもよい。
照明装置１００では、電源ユニット４と照明器具１とを別個の構成としたが、本発明はこの構造に限定されない。すなわち本発明の照明装置は、照明器具１が電源ユニット４を内蔵してなる構成としてもよい。 In the present invention, the latch member 3 is not essential. The luminaire 1 may be fixed to the construction material using screws, rivets, adhesion, or the like.
In the lighting device 100, the power supply unit 4 and the lighting fixture 1 are configured separately, but the present invention is not limited to this structure. That is, the illuminating device of the present invention may be configured such that the luminaire 1 includes the power supply unit 4 therein.

本発明に係る発光素子は、例えば、ＬＤ（レーザダイオード）や、ＥＬ素子（エレクトリックルミネッセンス素子）であっても良い。また本発明に係る発光素子としては、ＳＭＤ（Surface Mount Device）型でもよい。
また本発明に係る照明装置では、導光板の環状外周部と拡散カバーは必須ではない。従って、導光板の環状外周部と拡散カバーとを省略することもできる。 The light emitting element according to the present invention may be, for example, an LD (laser diode) or an EL element (electric luminescence element). The light emitting device according to the present invention may be an SMD (Surface Mount Device) type.
Moreover, in the illuminating device which concerns on this invention, the cyclic | annular outer peripheral part and diffusion cover of a light-guide plate are not essential. Therefore, the annular outer peripheral portion of the light guide plate and the diffusion cover can be omitted.

上記実施の形態では、反射部材３０を一体型として構成した。しかしながら本発明では、隣接する開口３４同士を互いに連通させてもよい。この場合、反射部材３０は内側反射部３１と外側反射部３３の２部材で構成することができる。
上記各実施の形態では、実装基板２０の上方に設ける板状部材として反射部材３０を例示した。しかしながら本発明では板状部材の構成を反射部材に限定しない。すなわち、板状部材を反射性を有さない構成とすることもできる。 In the above embodiment, the reflecting member 30 is configured as an integral type. However, in the present invention, adjacent openings 34 may communicate with each other. In this case, the reflecting member 30 can be composed of two members, an inner reflecting portion 31 and an outer reflecting portion 33.
In each of the above embodiments, the reflecting member 30 is exemplified as the plate-like member provided above the mounting substrate 20. However, in the present invention, the configuration of the plate member is not limited to the reflecting member. That is, the plate-like member can be configured not to have reflectivity.

上記各実施の形態では照明器具１を円盤状としているが、照明器具１はこの形状に限定されない。例えば長尺状の基板本体に複数の発光素子を配列させて実装基板２０を構成してもよい。この場合、ベース１０、反射部材３０、導光板４０、集光カバー５０、拡散カバー６０をそれぞれ実装基板２０と同様に長尺状に構成する。これにより照明器具１を長尺状とすることもできる。   In each of the above embodiments, the luminaire 1 has a disk shape, but the luminaire 1 is not limited to this shape. For example, the mounting substrate 20 may be configured by arranging a plurality of light emitting elements on a long substrate body. In this case, the base 10, the reflection member 30, the light guide plate 40, the light collection cover 50, and the diffusion cover 60 are each configured to be long like the mounting substrate 20. Thereby, the lighting fixture 1 can also be made into long shape.

導光板４０において、凹状反射部４０３は少なくとも上レンズ部５０１及び下レンズ部５０２の配設位置に合わせて設ければよい。
また、凹状反射部４０４は必須の構成ではないので、設けなくてもよい。さらに凹状反射部４０４は、凹状反射部４０３と同一の構成としてもよい。
集光カバー５０において、下レンズ部５０２は省略してもよい。すなわち、集光カバー５０に設けるレンズ部は、少なくとも導光板４０との対向面と背向する面上に形成されていればよい。しかしながら、集光カバー５０と導光板４０とが過度に密着すると、導光板４０の主面４０２で光の正反射が増えることがある。従って、戻り光の増加を防止するためにも集光カバー５０に下レンズ部５０２を設けることは好適である。 In the light guide plate 40, the concave reflection part 403 may be provided at least in accordance with the arrangement positions of the upper lens part 501 and the lower lens part 502.
In addition, the concave reflecting portion 404 is not an essential configuration and may not be provided. Furthermore, the concave reflecting portion 404 may have the same configuration as the concave reflecting portion 403.
In the light collection cover 50, the lower lens portion 502 may be omitted. That is, the lens part provided in the light collection cover 50 should just be formed on the surface facing the light guide plate 40 at the back. However, if the light collecting cover 50 and the light guide plate 40 are excessively adhered, regular reflection of light may increase on the main surface 402 of the light guide plate 40. Accordingly, it is preferable to provide the lower lens portion 502 in the light collecting cover 50 in order to prevent an increase in return light.

１ 照明器具
２ 天井
４ 電源ユニット
１０ ベース
２０ 実装基板
２１ 基板
２２ 発光素子
３０ 反射部材
３１ 内側反射部
３２ 凹入部
３３ 外側反射部
３４ 開口
４０、４０Ａ、４０Ｂ、９４０ 導光板
４１ 内側導光部
４２ 環状部
４３ 外側導光部
５０ 集光カバー
６０ 拡散カバー
１００ 照明装置
４０１、４０１Ｂ 裏面
４０２、４０２Ｂ 主面
４０３、４０３Ａ、４０３Ｂ、４０４ 凹状反射部
５００ ベース部
５０１ 上レンズ部
５０２ 下レンズ部
５０１０ 第１レンズ領域
５０１０ａ 上レンズ部の頂部
５０１１ 第２レンズ領域
５０１１ａ 基部
５０２０ａ 下レンズ部の頂部 DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Ceiling 4 Power supply unit 10 Base 20 Mounting board 21 Board 22 Light emitting element 30 Reflective member 31 Inner reflection part 32 Recessed part 33 Outer reflection part 34 Opening 40, 40A, 40B, 940 Light guide plate 41 Inner light guide part 42 Annular Part 43 Outer light guide part 50 Condensing cover 60 Diffusion cover 100 Illuminating device 401, 401B Back face 402, 402B Main surface 403, 403A, 403B, 404 Concave reflection part 500 Base part 501 Upper lens part 502 Lower lens part 5010 First lens Region 5010a Top portion of upper lens portion 5011 Second lens region 5011a Base portion 5020a Top portion of lower lens portion

Claims (10)

複数の発光素子と、
前記複数の発光素子から出射した光を板内において導光する導光板と、
前記導光板の主面の少なくとも一部を覆う集光カバーとを備え、
前記導光板は、前記主面と背向する裏面の一部を凹入させ且つ前記導光板の板内に導光される光を前記集光カバー側に反射させる複数の凹状反射部を有し、
前記集光カバーは、前記各凹状反射部と個別に光学的な対向関係を保って配置され且つ前記各凹状反射部からの反射光を前記導光板の主面に垂直な主出射方向に集光する複数のレンズ部とを有し、
前記レンズ部は、光軸上の基準位置からレンズ表面の任意位置までの距離と、前記基準位置及びレンズ表面の任意位置を通る直線と前記光軸とのなす角度とを関係付ける関係式により、表面形状が規定される非球面レンズであり、前記レンズ部の頂部を含む第１レンズ領域と、前記レンズ部の基部を含み且つ前記第１レンズ領域と隣り合う第２レンズ領域とを有し、
前記第１レンズ領域の表面形状が第１関係式で規定され、
前記第２レンズ領域の表面形状が、前記第１関係式で規定した場合に比べて前記距離が長くなる第２関係式で規定されている
ことを特徴とする照明装置。 A plurality of light emitting elements;
A light guide plate for guiding light emitted from the plurality of light emitting elements in the plate;
A light collecting cover that covers at least a part of the main surface of the light guide plate;
The light guide plate has a plurality of concave reflecting portions that have a part of the back surface facing away from the main surface and that reflect the light guided into the plate of the light guide plate toward the light collection cover side. ,
The condensing cover is disposed in an optically opposing relationship with each concave reflecting portion and collects the reflected light from each concave reflecting portion in a main emission direction perpendicular to the main surface of the light guide plate. A plurality of lens parts,
The lens unit has a relational expression that relates a distance from a reference position on the optical axis to an arbitrary position on the lens surface, and an angle formed between the reference position and a straight line passing through the arbitrary position on the lens surface and the optical axis, An aspherical lens whose surface shape is defined, and includes a first lens region including a top portion of the lens portion, and a second lens region including a base portion of the lens portion and adjacent to the first lens region,
The surface shape of the first lens region is defined by a first relational expression,
The illumination device characterized in that the surface shape of the second lens region is defined by a second relational expression in which the distance becomes longer than that defined by the first relational expression. 前記集光カバーは、主面に前記各レンズ部が配置された板状のベース部をさらに有し、
前記集光カバーは、前記ベース部の主面と背向する裏面において前記導光板の主面と対向配置され、
前記各レンズ部のピッチをＷ、前記導光板の板厚をＤとするとき、１．５≦Ｗ／Ｄ≦２．５の関係が成立する
請求項２に記載の照明装置。 The condensing cover further includes a plate-like base portion in which the lens portions are arranged on the main surface,
The condensing cover is disposed opposite to the main surface of the light guide plate on the back surface opposite to the main surface of the base portion,
The lighting device according to claim 2, wherein a relationship of 1.5 ≦ W / D ≦ 2.5 is established, where W is a pitch between the lens portions and D is a thickness of the light guide plate. 前記導光板中の基準位置Ａから前記第１レンズ領域の表面の任意位置までの距離をｒ1、前記基準位置Ａから前記頂部までの距離をｔ1、前記距離ｒ1を通る直線と前記レンズ部の光軸との間の角度をθ1、ｎを前記導光板の屈折率とするとき、前記第１関係式として
ｒ1＝（ｎ−１）×ｔ1／（ｎ−ｃｏｓθ1）が成立する
請求項１または２に記載の照明装置。 The distance from the reference position A in the light guide plate to an arbitrary position on the surface of the first lens region is r 1 , the distance from the reference position A to the top is t 1 , and the straight line passing through the distance r 1 and the lens When the angle between the optical axis of the portion is θ 1 and n is the refractive index of the light guide plate, r 1 = (n−1) × t 1 / (n−cos θ 1 ) as the first relational expression. The lighting device according to claim 1 or 2. 前記導光板中の基準位置Ａから前記第２レンズ領域の表面の任意位置までの距離をｒ2、基準位置Ａから前記第１レンズ領域の表面までの最大高さをｔ1、前記距離ｒ2を通る直線と前記レンズ部の光軸との間の角度をθ2、ｎを前記導光板の屈折率、ｋ1、ｋ2を正の定数、基準位置Ａから前記レンズ部の表面における前記第１レンズ領域と前記第２レンズ領域との境界を通る直線と前記レンズ部の光軸との間の角度をθchとするとき、前記第２関係式として
ｒ2＝（ｎ−１）｛ｔ1＋ｋ1（θ2−θch）k2／（ｎ−ｃｏｓθ2）
が成立する
請求項１〜３のいずれかに記載の照明装置。 The distance from the reference position A in the light guide plate to an arbitrary position on the surface of the second lens region is r 2 , the maximum height from the reference position A to the surface of the first lens region is t1, and the distance r 2 is The angle between the straight line passing through and the optical axis of the lens unit is θ 2 , n is the refractive index of the light guide plate, k 1 and k 2 are positive constants, and the first position on the surface of the lens unit from the reference position A When the angle between the straight line passing through the boundary between the lens region and the second lens region and the optical axis of the lens unit is θ ch , r 2 = (n−1) {t 1 + K 1 (θ 2 −θ ch ) k 2 / (n−cos θ 2 )
The lighting device according to any one of claims 1 to 3. 前記集光カバーは、前記導光板の主面と対向するように配置された複数の補助レンズ部をさらに有し、
前記各補助レンズ部は前記各レンズ部と個別に互いの光軸が一致するように配置されている
請求項１〜４のいずれかに記載の照明装置。 The light collecting cover further includes a plurality of auxiliary lens portions arranged to face the main surface of the light guide plate,
The illuminating device according to any one of claims 1 to 4, wherein the auxiliary lens units are arranged so that the optical axes of the auxiliary lens units individually match the lens units. 前記補助レンズ部の光軸に沿った前記導光板中の基準位置Ｂから前記補助レンズ部の表面の任意位置までの距離をｒ3、前記基準位置Ｂから前記補助レンズの頂部までの距離をｔ3、前記距離ｒ3を通る直線と前記補助レンズ部の光軸との間の角度をθ3、ｎを前記集光カバーの屈折率とするとき、第３関係式として
ｒ3＝（ｎ−１）×ｔ3×ｃｏｓθ3／（（ｎ×ｃｏｓ−１）×√ｎ2−ｓｉｎ2θ3）が成立する
請求項５に記載の照明装置。 The distance from the reference position B in the light guide plate along the optical axis of the auxiliary lens portion to an arbitrary position on the surface of the auxiliary lens portion is r 3 , and the distance from the reference position B to the top of the auxiliary lens is t 3 , where θ 3 is the angle between the straight line passing through the distance r 3 and the optical axis of the auxiliary lens unit, and n is the refractive index of the light collecting cover, r 3 = (n− The lighting device according to claim 5, wherein 1) × t 3 × cos θ 3 / ((n × cos−1) × √n 2 −sin 2 θ 3 ) is established. 前記凹状反射部は円錐状である
請求項１〜６のいずれかに記載の照明装置。 The illuminating device according to claim 1, wherein the concave reflecting portion has a conical shape. 基板表面に前記複数の発光素子が実装されてなる実装基板をさらに備え、
前記複数の発光素子は前記基板上において環状の素子列を形成し、
前記導光板は、前記素子列に沿って環状に配された環状部と、前記環状部の内側に前記環状部と連続して配された環内部とを有する円盤状であり、
前記凹状反射部が少なくとも前記環状部に存在している
請求項１〜７のいずれかに記載の照明装置。 Further comprising a mounting substrate in which the plurality of light emitting elements are mounted on the substrate surface,
The plurality of light emitting elements form an annular element array on the substrate,
The light guide plate has a disc shape having an annular portion arranged annularly along the element row and an inside of the ring continuously arranged with the annular portion inside the annular portion,
The illuminating device according to claim 1, wherein the concave reflection portion is present at least in the annular portion. 前記発光素子はＬＥＤである
請求項１〜８のいずれかに記載の照明装置。 The lighting device according to claim 1, wherein the light emitting element is an LED. 前記発光素子に電力供給するための電源ユニットを有する
請求項１〜９のいずれかに記載の照明装置。 The lighting device according to claim 1, further comprising a power supply unit for supplying power to the light emitting element.
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CN109216527A (en) * 2017-07-06 2019-01-15 日亚化学工业株式会社 Light emitting device
CN109216527B (en) * 2017-07-06 2023-08-15 日亚化学工业株式会社 Light emitting device
JP2019091568A (en) * 2017-11-13 2019-06-13 パナソニックＩｐマネジメント株式会社 Lighting fixture and luminaire

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