JP2018063953A

JP2018063953A - Luminaire

Info

Publication number: JP2018063953A
Application number: JP2017238387A
Authority: JP
Inventors: 健吾石井; Kengo Ishii; 絵里桑原; Eri Kuwahara; 米田　俊之; Toshiyuki Yoneda; 俊之米田; 和生伴; Kazuo Ban
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2017-12-13
Filing date: 2017-12-13
Publication date: 2018-04-19
Anticipated expiration: 2034-02-28
Also published as: JP6555329B2

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire exhibiting high comfortableness, and a light source cover.SOLUTION: A luminaire comprises: a light-emitting device; a rectangular substrate on which the light-emitting device is mounted along a longitudinal direction; a housing in which the substrate is arranged; and a light source cover which has a long shape and is provided to the housing so as to cover the light-emitting device. The light source cover has a reflection surface laterally in a transverse direction of the substrate, and the reflection surface reflects light from the light-emitting device in a direction in which the light is made close to an optical axis of the light-emitting device.SELECTED DRAWING: Figure 2

Description

本発明は、照明器具に関する。 The present invention relates to a lighting fixture.

蛍光灯や白熱電球などの従来光源に比べ、発光ダイオード（ＬｉｇｈｔＥｍｉｔｔｉｎｇＤｉｏｄｅ：ＬＥＤ）は長寿命である。例えば特開２０１２−６９２９７号公報に開示されているように、ＬＥＤは、近年その発光効率および光束の向上に伴って様々な照明器具の光源として用いられている。 Compared to conventional light sources such as fluorescent lamps and incandescent lamps, light emitting diodes (LEDs) have a long life. For example, as disclosed in Japanese Patent Application Laid-Open No. 2012-69297, LEDs have recently been used as light sources for various lighting fixtures as their luminous efficiency and luminous flux improve.

特開２０１２−６９２９７号公報JP 2012-69297 A

上記従来の照明器具では、ＬＥＤ光源を列状に配置し、透光性を有する拡散カバーで覆う直管形光源と直管形光源を組み込んだ照明器具が開示されている。しかしながら、拡散カバーにより光を拡散させて出射するので、人がグレアとして不快に感じる範囲にも光（おおよそ器具水平面から３０度までの範囲の光）が照射され、快適性が低いという問題があった。 In the above-described conventional lighting fixtures, a lighting fixture is disclosed in which LED light sources are arranged in a line and a straight tube light source and a straight tube light source are covered with a light-transmitting diffusion cover. However, since the light is diffused and emitted by the diffusing cover, there is a problem that the light (approximately 30 degrees from the instrument horizontal plane) is irradiated even in the area where the person feels uncomfortable as glare, and the comfort is low. It was.

本発明は、上述のような課題を解決するためになされたもので、快適性の高い照明器具を提供することを目的とする。 The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lighting device with high comfort.

本発明にかかる照明器具は、発光素子と、該発光素子が長手方向に沿って実装された長方形状の基板と、該基板が配設された筐体と、長尺形状であり、該発光素子を覆うように該筐体に設けられた光源カバーと、を備え、該光源カバーは、該基板の短手方向の側方に反射面を有し、該反射面は、該発光素子からの光を該発光素子の光軸に近づける方向に反射させる。 The luminaire according to the present invention has a light emitting element, a rectangular substrate on which the light emitting element is mounted along the longitudinal direction, a casing in which the substrate is disposed, and a long shape. A light source cover provided on the casing so as to cover the light source, and the light source cover has a reflective surface on a lateral side of the substrate, and the reflective surface is light from the light emitting element. Is reflected in a direction approaching the optical axis of the light emitting element.

本発明によれば、光源カバーにグレア光を抑制する指向性制御機能を持たせることにより、被照射面の照射むらが少なくなり、快適性の高い照明器具を得ることができる。 According to the present invention, by providing the light source cover with a directivity control function for suppressing glare light, uneven illumination on the irradiated surface is reduced, and a highly comfortable lighting fixture can be obtained.

本発明の実施の形態１にかかる照明器具の斜視図である。It is a perspective view of the lighting fixture concerning Embodiment 1 of this invention. 実施の形態１にかかる照明器具の図１のＡ−Ａ線に沿う断面図である。It is sectional drawing which follows the AA line of FIG. 1 of the lighting fixture concerning Embodiment 1. FIG. 実施の形態１にかかる照明器具の分解斜視図である。1 is an exploded perspective view of a lighting fixture according to a first embodiment. 実施の形態１にかかる照明器具の効果を説明するための光路図である。FIG. 6 is an optical path diagram for explaining an effect of the lighting apparatus according to the first embodiment. 実施の形態１にかかる照明器具の効果を説明するための光路図である。FIG. 6 is an optical path diagram for explaining an effect of the lighting apparatus according to the first embodiment. 実施の形態１にかかる照明器具の効果を説明するための光路図である。FIG. 6 is an optical path diagram for explaining an effect of the lighting apparatus according to the first embodiment. 実施の形態１にかかる照明器具の効果を説明するための配光分布図である。It is a light distribution distribution diagram for demonstrating the effect of the lighting fixture concerning Embodiment 1. FIG. 実施の形態１にかかる照明器具の効果を説明するための配光分布図である。It is a light distribution distribution diagram for demonstrating the effect of the lighting fixture concerning Embodiment 1. FIG. 実施の形態１にかかる照明器具の効果を説明するための照度分布図である。It is an illuminance distribution figure for demonstrating the effect of the lighting fixture concerning Embodiment 1. FIG. 本発明の実施の形態２にかかる照明器具の断面図である。It is sectional drawing of the lighting fixture concerning Embodiment 2 of this invention. 実施の形態２にかかる照明器具の効果を説明するための光路図である。It is an optical path diagram for demonstrating the effect of the lighting fixture concerning Embodiment 2. FIG. 実施の形態２にかかる照明器具の効果を説明するための光路を示す拡大図である。It is an enlarged view which shows the optical path for demonstrating the effect of the lighting fixture concerning Embodiment 2. FIG. 実施の形態２にかかる照明器具の断面図である。It is sectional drawing of the lighting fixture concerning Embodiment 2. FIG. 実施の形態２にかかる照明器具の効果を説明するための配光分布図である。It is a light distribution map for demonstrating the effect of the lighting fixture concerning Embodiment 2. FIG. 実施の形態２にかかる照明器具の効果を説明するための配光分布図である。It is a light distribution map for demonstrating the effect of the lighting fixture concerning Embodiment 2. FIG. 本発明の実施の形態３にかかる照明器具の断面図である。It is sectional drawing of the lighting fixture concerning Embodiment 3 of this invention. 本発明の実施の形態３にかかる照明器具の拡大断面図である。It is an expanded sectional view of the lighting fixture concerning Embodiment 3 of this invention. 本発明の実施の形態３にかかる照明器具の拡大断面図である。It is an expanded sectional view of the lighting fixture concerning Embodiment 3 of this invention. 本発明の実施の形態４にかかる照明器具を示す図である。It is a figure which shows the lighting fixture concerning Embodiment 4 of this invention. 本発明の実施の形態４にかかる照明器具を示す断面図である。It is sectional drawing which shows the lighting fixture concerning Embodiment 4 of this invention. 実施の形態の変形例にかかる光源カバーの断面図である。It is sectional drawing of the light source cover concerning the modification of embodiment. 実施の形態の変形例にかかる照明器具の図である。It is a figure of the lighting fixture concerning the modification of embodiment.

以下、本発明の実施の形態について図面を用いて詳細に説明する。以下の実施の形態の説明中で「上」、「下」、「左」、「右」といった用語を使用して方向を説明するが、これらの用語は本実施の形態にかかる装置、器具、および部品等における相対的な配置関係および相対的な方向を説明するための便宜上のものである。また、本発明は図面に記載した具体的な形状、構造等のみに限定されるものではない。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description of the embodiments, terms such as “up”, “down”, “left”, and “right” are used to describe directions, and these terms are used for the apparatus, instrument, It is for the sake of convenience to explain the relative arrangement relationship and relative direction of components and the like. Further, the present invention is not limited only to the specific shape, structure and the like described in the drawings.

実施の形態１．
図１は本発明の実施の形態１にかかる照明器具１００の斜視図である。図２は図１のＡ−Ａ線に沿う断面図であり、照明器具１００の短手方向に切断したときの切り口を示す。なお、図１に示すＢ−Ｂ線は、照明器具１００の長手方向に沿って伸びている。図３は、照明器具１００の分解斜視図である。 Embodiment 1 FIG.
FIG. 1 is a perspective view of a lighting fixture 100 according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1 and shows a cut surface when the lighting apparatus 100 is cut in the short direction. 1 extends along the longitudinal direction of the luminaire 100. The BB line shown in FIG. FIG. 3 is an exploded perspective view of the lighting fixture 100.

照明器具１００は、発光素子であるＬＥＤ１０と、表面に複数のＬＥＤ１０が並べて実装された基板２０と、基板２０の裏面に接続する筐体３０と、基板２０の上に設けられた拡散板４０と、基板２０の両脇に配置されて拡散板４０を支持する反射板８０と、ＬＥＤ１０を覆うように設けられ端部が筐体３０に接続する光源カバー５０を備える。光源カバー５０の端面には側板５４が接着されている。図２に示す一点鎖線はＬＥＤ１０の光軸１１を表し、ＬＥＤ１０から上側方向に光が出射される。図１の光軸１１は、ちょうどＡ−Ａ断面視における照明器具１００の中心軸に一致している。ＬＥＤ１０は、合成光として白色光を得る発光素子としてもよく、具体的には波長４４０ｎｍ〜４８０ｎｍ程度の青色光を発するＬＥＤチップと青色光を黄色光に波長変換する蛍光体を樹脂パッケージ内に配した素子であってもよい。基板２０は長方形の板状の基板であり、好ましくはガラスエポキシ製である。基板２０の上に、長手方向に沿ってＬＥＤ１０が実装されている。基板２０の表面には光の反射率を高めるため、白色レジストが塗布されていることが好ましい。また基板２０にはダイオードなどの回路素子およびコネクタ等の端子（いずれも図示せず）も実装されている。 The luminaire 100 includes an LED 10 that is a light-emitting element, a substrate 20 on which a plurality of LEDs 10 are mounted side by side, a housing 30 that is connected to the back surface of the substrate 20, and a diffusion plate 40 that is provided on the substrate 20. The light source cover 50 is provided so as to cover the LED 10 and has an end connected to the housing 30. The reflector 80 is disposed on both sides of the substrate 20 to support the diffusion plate 40. A side plate 54 is bonded to the end surface of the light source cover 50. The alternate long and short dash line in FIG. 2 represents the optical axis 11 of the LED 10, and light is emitted upward from the LED 10. The optical axis 11 in FIG. 1 coincides with the central axis of the luminaire 100 in the AA sectional view. The LED 10 may be a light-emitting element that obtains white light as synthetic light. Specifically, an LED chip that emits blue light with a wavelength of about 440 nm to 480 nm and a phosphor that converts blue light into yellow light are arranged in a resin package. It may be an element. The substrate 20 is a rectangular plate-shaped substrate, and is preferably made of glass epoxy. The LED 10 is mounted on the substrate 20 along the longitudinal direction. The surface of the substrate 20 is preferably coated with a white resist in order to increase the light reflectance. In addition, circuit elements such as diodes and terminals (not shown) such as connectors are mounted on the substrate 20.

ＬＥＤ１０が実装された基板２０は筐体３０に接着保持されている。筐体３０は、好ましくは反射率を高めるため白色塗装された板金で構成されている。なお、筐体３０はＬＥＤ１０の熱を放熱する放熱板の役割も兼ねている。拡散板４０は、ＬＥＤ１０の出射面側を覆うように配設されており、好ましくは乳白の拡散材を混ぜ込んだポリカーボネイト製である。拡散板４０により、ＬＥＤ１０が離散的に配置されていることによる明暗むらが軽減される。反射板８０は、拡散板４０の端面を覆い拡散板４０を挟むように配置され、拡散板４０端面からの光の出射を抑制している。反射板８０は、好ましくは、９５％以上の反射率を有する白色のポリカーボネイト製である。光源カバー５０は光透過性を有し拡散板４０を覆うように配設され、好ましくは透明のポリカーボネイト製である。拡散板４０と反射板８０とは筐体３０により位置決めされる。 The substrate 20 on which the LED 10 is mounted is bonded and held to the housing 30. The housing 30 is preferably made of a sheet metal coated with white to increase the reflectance. The housing 30 also serves as a heat radiating plate that radiates the heat of the LED 10. The diffusing plate 40 is disposed so as to cover the emission surface side of the LED 10, and is preferably made of polycarbonate mixed with a milky white diffusing material. Due to the diffusion plate 40, uneven brightness due to the discrete arrangement of the LEDs 10 is reduced. The reflection plate 80 is disposed so as to cover the end surface of the diffusion plate 40 and sandwich the diffusion plate 40, and suppresses emission of light from the end surface of the diffusion plate 40. The reflector 80 is preferably made of white polycarbonate having a reflectance of 95% or more. The light source cover 50 has light transmittance and is disposed so as to cover the diffusion plate 40, and is preferably made of transparent polycarbonate. The diffusing plate 40 and the reflecting plate 80 are positioned by the housing 30.

光源カバー５０の断面形状について、図２に基づいて以下に説明する。光源カバー５０は光軸１１を中心とした左右対称形状である。光源カバー５０は断面視で厚さが一定な均厚部５１と、この均厚部５１に並べて設けられ光軸１１から離れるにつれ断面視で厚さが薄くなる傾斜部５２と、傾斜部５２から連なる反射部５３とからなる。本実施の形態にかかる光源カバー５０は均厚部５１、傾斜部５２、および反射部５３が一個の連続的な物体を構成したものである。なお、光源カバー５０は上記断面形状を基板２０の長手方向に延伸した形状を有しており、押し出し成形にて製造されてもよい。 The cross-sectional shape of the light source cover 50 will be described below with reference to FIG. The light source cover 50 has a symmetrical shape with the optical axis 11 as the center. The light source cover 50 includes a uniform thickness portion 51 having a constant thickness in a cross-sectional view, an inclined portion 52 provided side by side in the uniform thickness portion 51 and having a thickness reduced in a sectional view as the distance from the optical axis 11 increases. It consists of a continuous reflection part 53. In the light source cover 50 according to the present embodiment, the uniform thickness portion 51, the inclined portion 52, and the reflecting portion 53 constitute one continuous object. The light source cover 50 has a shape obtained by extending the cross-sectional shape in the longitudinal direction of the substrate 20 and may be manufactured by extrusion molding.

図４〜６は、実施の形態１にかかる照明器具１００の効果を説明するための光路図である。図４〜６に示す光路を参照しながら、光源カバー５０についてさらに説明を行う。図４は光源カバー５０の均厚部５１を説明するための図であり、図５は傾斜部５２を、図６は反射部５３をそれぞれ説明するための図である。ＬＥＤ１０を出射した光は拡散板４０により拡散され光源カバー５０に到達する。まず、図４を用い均厚部５１に到達した光について説明する。光源カバー５０の入射面のうち、基板２０と平行な面を第一入射面５１ａ、第一入射面５１ａを囲んだ面を第二入射面５３ａとすると、第一入射面５１ａに到達した光は屈折し光源カバー５０内に入る。さらに第一入射面５１ａに対向する出射面５１ｂで屈折し、出射する。ここで、均厚部５１は厚さがほぼ一定の領域、すなわち、第一入射面５１ａと出射面５１ｂはほぼ平行であるから、均厚部５１に入射する角度θａと均厚部５１から出射する角度θｂはほぼ同じ角度となる。グレア光となる角度θｇ以下の光を抑制するためには、拡散板４０から光源カバー５０の均厚部５１に入射する光の角度θａが角度θｇ以上となればよい。 FIGS. 4-6 is an optical path diagram for demonstrating the effect of the lighting fixture 100 concerning Embodiment 1. FIGS. The light source cover 50 will be further described with reference to the optical paths shown in FIGS. 4 is a view for explaining the uniform thickness portion 51 of the light source cover 50, FIG. 5 is a view for explaining the inclined portion 52, and FIG. 6 is a view for explaining the reflection portion 53. The light emitted from the LED 10 is diffused by the diffusion plate 40 and reaches the light source cover 50. First, the light that has reached the uniform thickness portion 51 will be described with reference to FIG. Of the incident surfaces of the light source cover 50, assuming that a surface parallel to the substrate 20 is a first incident surface 51 a and a surface surrounding the first incident surface 51 a is a second incident surface 53 a, the light reaching the first incident surface 51 a is The light is refracted and enters the light source cover 50. Further, the light is refracted and emitted from the exit surface 51b facing the first entrance surface 51a. Here, the uniform thickness portion 51 is a region where the thickness is substantially constant, that is, the first incident surface 51a and the emission surface 51b are substantially parallel, so that the angle θa incident on the uniform thickness portion 51 and the uniform thickness portion 51 are emitted. The angle θb to be performed is substantially the same angle. In order to suppress the light having the angle θg or less that becomes glare light, the angle θa of the light incident from the diffuser plate 40 to the uniform thickness portion 51 of the light source cover 50 may be equal to or greater than the angle θg.

発光面となる拡散板４０の幅をＷｋ、拡散板４０から光源カバー５０までの距離をＨ、均厚部５１の厚みをＴ、光源カバー５０の屈折率をｎとした時、均厚部５１の幅Ｗｓは下記に示す式（１）を満たす関係としている。
（Ｗｓ＋Ｗｋ）／２−Ｔ×ｔａｎ（ｓｉｎ^−１（ｃｏｓ（θｇ）／ｎ））＜Ｈ／ｔａｎ（θｇ）・・・（１）
本実施の形態１においては角度θｇを３０度とし、式（２）の関係としている。
（Ｗｓ＋Ｗｋ）／２−Ｔ×ｔａｎ（ｓｉｎ^−１（ｃｏｓ（３０°）／ｎ））＜Ｈ／ｔａｎ（３０°）・・・（２）
式（２）を満たすことにより、照明器具１００の長手方向に垂直な断面において光源カバー５０の均厚部５１に入射する角度θａは３０度以上となり、均厚部５１から出射する光も所望の３０度以上となる。よって、照明器具１００の長手方向に垂直な断面において、均厚部５１から出射する光はグレア光を含まない。 When the width of the diffusing plate 40 serving as a light emitting surface is Wk, the distance from the diffusing plate 40 to the light source cover 50 is H, the thickness of the uniform thickness portion 51 is T, and the refractive index of the light source cover 50 is n, the uniform thickness portion 51. The width Ws is such that the following equation (1) is satisfied.
(Ws + Wk) / 2−T × tan (sin ⁻¹ (cos (θg) / n)) <H / tan (θg) (1)
In the first embodiment, the angle θg is set to 30 degrees, and the relationship of Expression (2) is established.
(Ws + Wk) / 2−T × tan (sin ⁻¹ (cos (30 °) / n)) <H / tan (30 °) (2)
By satisfying the expression (2), the angle θa incident on the uniform thickness portion 51 of the light source cover 50 in the cross section perpendicular to the longitudinal direction of the lighting fixture 100 is 30 degrees or more, and the light emitted from the uniform thickness portion 51 is also desired. 30 degrees or more. Therefore, in the cross section perpendicular to the longitudinal direction of the luminaire 100, the light emitted from the uniform thickness portion 51 does not include glare light.

次に、図５を用いて傾斜部５２に到達した光について説明する。傾斜部５２のＬＥＤ１０側の第一入射面５１ａに到達した光は屈折し光源カバー５０内部に入る。さらに第一入射面５１ａに対向する出射面５２ｂで屈折し、出射する。ここで、傾斜部５２は光軸１１から離れるにつれて薄くなるから、光源カバー５０に入射する光線に対し出射する光線は光軸１１に平行な方向に近づくことになる。 Next, the light which reached | attained the inclination part 52 is demonstrated using FIG. The light reaching the first incident surface 51 a on the LED 10 side of the inclined portion 52 is refracted and enters the light source cover 50. Further, the light is refracted and emitted from the exit surface 52b facing the first entrance surface 51a. Here, since the inclined portion 52 becomes thinner as it moves away from the optical axis 11, the light beam emitted with respect to the light beam incident on the light source cover 50 approaches a direction parallel to the optical axis 11.

発光面となる拡散板４０の幅をＷｋ、拡散板４０から光源カバー５０までの距離をＨ、第一入射面の幅をＷｅ、光源カバー５０の屈折率をｎとした時、第一入射面５１ａと出射面５２ｂが成す傾斜角θαは下記に示す式（３）を満たす関係としている。
θｇ＜９０−θα−ｓｉｎ^−１（ｎ×ｓｉｎ×（ｓｉｎ^−１（（ｓｉｎ（ｔａｎ^−１（Ｗｗ／Ｈ）））／ｎ）−θα））・・・（３）
但し、Ｗｗ＝（Ｗｋ＋Ｗｅ）／２
式（３）を満たすことにより、照明器具１００の長手方向に垂直な断面において光源カバー５０の傾斜部５２から出射する光もθｇ度以上となる。よって、照明器具１００の長手方向に垂直な断面（図１におけるｘ−ｙ断面）において傾斜部５２から出射する光は所望の角度範囲のグレア光を抑制することができる。 When the width of the diffusing plate 40 serving as the light emitting surface is Wk, the distance from the diffusing plate 40 to the light source cover 50 is H, the width of the first incident surface is We, and the refractive index of the light source cover 50 is n, the first incident surface. The inclination angle θα formed by 51a and the emission surface 52b satisfies the following formula (3).
θg <90−θα−sin ⁻¹ (n × sin × (sin ⁻¹ ((sin (tan ⁻¹ (Ww / H))) / n) −θα)) (3)
However, Ww = (Wk + We) / 2
By satisfy | filling Formula (3), the light radiate | emitted from the inclination part 52 of the light source cover 50 in a cross section perpendicular | vertical to the longitudinal direction of the lighting fixture 100 also becomes more than (theta) g degree. Therefore, the light emitted from the inclined portion 52 in the cross section perpendicular to the longitudinal direction of the luminaire 100 (the xy cross section in FIG. 1) can suppress glare light in a desired angle range.

次に、図６を用いて反射部５３に到達した光について説明する。第二入射面５３ａに到達した光は屈折し光源カバー５０内部に入る。さらに第二入射面５３ａに対向する反射面５３ｂでほぼ光軸１１に平行な方向へ全反射し、出射面５２ｂから出射する。 Next, the light that has reached the reflecting portion 53 will be described with reference to FIG. The light reaching the second incident surface 53 a is refracted and enters the light source cover 50. Further, the light is totally reflected in a direction substantially parallel to the optical axis 11 by the reflecting surface 53b facing the second incident surface 53a and is emitted from the emitting surface 52b.

図７および図８は照明器具１００の効果を説明するための配光分布図であり、図９はその照度分布図である。図７および図８は光軸１１を通る平面の配光分布であり、図７は図１におけるｘ−ｙ平面の配光分布を、図８は図１におけるｙ−ｚ平面の配光分布をそれぞれ示す。なお、光軸方向を０度としており、図中の破線は、比較対象として光源カバーに厚さが一定な乳白拡散板を用いた照明器具の配光分布である。図９は照明器具から２ｍ離れた位置の照度分布を示す図であり、照明器具１００による照度分布である。図９より、照明器具１００においては６０度以上の光（つまり器具水平面から３０度以下の光）が抑制されていることが分かる。また、透明な光源カバー５０の表面で反射することにより、ｙ−ｚ平面においても角度の大きな光が低減されていることが分かる。また、図７に示すように、６０度以上の光は主に傾斜部５２により１０〜５０度程度の光に変換されるため、光度がほぼ一定となる角度範囲が従来の照明器具より光が広がり、図９に示すように照度が均一の領域を広く得ることができる。 7 and 8 are light distribution diagrams for explaining the effects of the lighting apparatus 100, and FIG. 9 is an illuminance distribution diagram thereof. 7 and 8 show the light distribution on the plane passing through the optical axis 11, FIG. 7 shows the light distribution on the xy plane in FIG. 1, and FIG. 8 shows the light distribution on the yz plane in FIG. Each is shown. In addition, the optical axis direction is set to 0 degree, and the broken line in the figure is a light distribution of a luminaire using a milk white diffuser plate having a constant thickness as a light source cover for comparison. FIG. 9 is a diagram showing an illuminance distribution at a position 2 m away from the luminaire, and is an illuminance distribution by the luminaire 100. From FIG. 9, it can be seen that light of 60 degrees or more (that is, light of 30 degrees or less from the instrument horizontal plane) is suppressed in the lighting apparatus 100. Moreover, it turns out that the light with a large angle is reduced also in yz plane by reflecting on the surface of the transparent light source cover 50. FIG. Further, as shown in FIG. 7, light of 60 degrees or more is mainly converted into light of about 10 to 50 degrees by the inclined portion 52, so that the angle range in which the light intensity is almost constant is larger than that of the conventional lighting fixture. As shown in FIG. 9, a wide region with uniform illuminance can be obtained.

以上のように、ＬＥＤ１０を覆う光源カバー５０にグレア光を抑制する指向性制御機能を持たせることにより、被照射面の照射むらが少なく、小型で快適性の高い照明を行うことができる。すなわち、光源カバー５０はＬＥＤ１０に対向し光軸１１を含む領域に厚さが一定な均厚部５１を有し、均厚部５１から連続してＬＥＤ１０から遠ざかるにつれ厚みが減少する傾斜部５２を有し、傾斜部５２に連続してＬＥＤ１０からの光を反射する反射部を設けている。ＬＥＤ１０から正面方向に向かう光を維持したまま、グレアとなる方向に向かう光のみを光源カバー５０で正面方向へ屈折または反射させることにより、容易にかつ小型で人が不快に感じるグレアを抑制することができる。また、グレアの要因となっていた光を光軸に平行な方向へ屈折させることにより、照度むらが少なく均一性の高い照明光を得ることができる。また、拡散板４０を設けているので、ＬＥＤ１０の高輝度と離散配置に伴う明暗むらを軽減し、外観品位の高い照明器具を容易に得ることもできる。 As described above, by providing the light source cover 50 covering the LED 10 with a directivity control function for suppressing glare light, there is little irradiation unevenness on the irradiated surface, and it is possible to perform illumination that is small and highly comfortable. That is, the light source cover 50 has a uniform thickness portion 51 having a constant thickness in a region including the optical axis 11 facing the LED 10, and has an inclined portion 52 whose thickness decreases continuously as the distance from the LED 10 increases. And has a reflecting portion that reflects the light from the LED 10 continuously to the inclined portion 52. The light source cover 50 refracts or reflects only the light directed in the glare direction in the front direction while maintaining the light directed from the LED 10 in the front direction, thereby suppressing glare that is easily and small and uncomfortable to humans. Can do. Further, by refracting light that has been a cause of glare in a direction parallel to the optical axis, it is possible to obtain illumination light with little unevenness in illuminance and high uniformity. Moreover, since the diffusion plate 40 is provided, it is possible to reduce the uneven brightness due to the high brightness and discrete arrangement of the LED 10 and to easily obtain a lighting apparatus with high appearance quality.

実施の形態２．
図１０は、本発明の実施の形態２にかかる照明器具２００の断面図である。図１０は照明器具２００を図１に示したＡ−Ａ線と同じ位置で切断した断面図であり、図１１はそのＡ−Ａ断面の光路を示した図であり、図１２は図１１の一部を拡大した図である。図１３は、照明器具２００の断面図であり、切断位置は図１のＢ−Ｂ線と同じである。図１３には光線もあわせて示す。 Embodiment 2. FIG.
FIG. 10 is a cross-sectional view of the lighting apparatus 200 according to the second embodiment of the present invention. FIG. 10 is a cross-sectional view of the lighting apparatus 200 cut at the same position as the line AA shown in FIG. 1, FIG. 11 is a view showing the optical path of the AA cross section, and FIG. It is the figure which expanded a part. FIG. 13 is a cross-sectional view of the luminaire 200, and the cutting position is the same as the BB line of FIG. FIG. 13 also shows light rays.

実施の形態２にかかる照明器具２００は、光源カバー５０に代えてこれと形状の異なる光源カバー１５０を有する点、および拡散板４０と光源カバー１５０の間にプリズムシート１９０を設けた点が、実施の形態１と異なる。以下、実施の形態１と異なる事項について主に説明し、実施の形態１と同じ構成要素には同一の符号を付し、説明を省略した事項は実施の形態１と同様である。プリズムシート１９０は透明樹脂製で光源カバー１５０側に略三角状の凹凸を持ち、その稜線は基板２０の長手方向に直交する方向に伸びている。 The lighting fixture 200 according to the second embodiment is implemented in that a light source cover 150 having a shape different from that of the light source cover 50 is provided, and a prism sheet 190 is provided between the diffuser plate 40 and the light source cover 150. This is different from Form 1. In the following, matters different from those in the first embodiment will be mainly described. The same components as those in the first embodiment are denoted by the same reference numerals, and the items omitted in the description are the same as those in the first embodiment. The prism sheet 190 is made of a transparent resin and has substantially triangular irregularities on the light source cover 150 side, and its ridge line extends in a direction perpendicular to the longitudinal direction of the substrate 20.

光源カバー１５０の断面形状について、図１１に基づいて以下に説明する。図１１の光軸１１１は、ちょうどＡ−Ａ断面視における照明器具２００の中心軸に一致している。光源カバー１５０は、光源カバー５０と同様に、断面視で厚さが一定な均厚部１５１、光軸１１１から離れるにつれ厚さが薄くなる傾斜部１５２、および、傾斜部１５２から連なる反射部１５３から構成される。均厚部１５１、傾斜部１５２、反射部１５３の、それぞれの作用は実施の形態１と同様であるので、説明を省略する。第一入射面１５１ａと出射面１５２ｂの成す角度を、傾斜角θαとする。実施の形態２においては、傾斜角θαが幅Ｗｓの端の地点（つまり均厚部１５１の端）で０度となり、光軸１１１から離れるに従い大きくなるように設定しており、傾斜部１５２を曲面形状としている。 The cross-sectional shape of the light source cover 150 will be described below with reference to FIG. The optical axis 111 in FIG. 11 coincides with the central axis of the luminaire 200 in the AA sectional view. Similarly to the light source cover 50, the light source cover 150 has a uniform thickness portion 151 having a constant thickness in a cross-sectional view, an inclined portion 152 that becomes thinner as it moves away from the optical axis 111, and a reflective portion 153 that continues from the inclined portion 152. Consists of Since the functions of the uniform thickness portion 151, the inclined portion 152, and the reflecting portion 153 are the same as those of the first embodiment, the description thereof is omitted. An angle formed by the first incident surface 151a and the exit surface 152b is an inclination angle θα. In the second embodiment, the inclination angle θα is set to 0 degree at the end point of the width Ws (that is, the end of the thickness-uniforming part 151) and increases as the distance from the optical axis 111 increases. It has a curved shape.

ここで、発光面となる拡散板４０の幅をＷｋ、拡散板４０から光源カバー１５０までの距離をＨ、光源カバー１５０の屈折率をｎと表記する。
また、光軸から傾斜部を構成する出射面１５２ｂの任意の地点をＰ１とし、拡散板４０の端部から光源カバー１５０の中心軸１１２（あるいは光軸１１１）をまたいで進みＰ１に至る光路と、光源カバー１５０の内側の面つまり第一入射面１５１ａとが交わる点をＰ２とする。点Ｐ１と中心軸１１２の距離をＤｈと表記し、点Ｐ２と中心軸１１２の距離をＤｎと表記する。このとき、本実施の形態では、グレア光となる角度θｇ以下の光を抑制するために、第一入射面１５１ａと出射面１５２ｂが成す傾斜角θαが下記に示す式（４）を満たすようにしている。
θｇ＜９０−θα−ｓｉｎ^−１（ｎ×ｓｉｎ×（ｓｉｎ^−１（（ｓｉｎ（ｔａｎ^−１（Ｗｗ／Ｈ）））／ｎ）−θα））・・・（４）
但し、Ｗｗ＝Ｗｋ／２＋Ｄｎ Here, the width of the diffusion plate 40 serving as the light emitting surface is expressed as Wk, the distance from the diffusion plate 40 to the light source cover 150 is expressed as H, and the refractive index of the light source cover 150 is expressed as n.
Further, an arbitrary point on the emission surface 152b constituting the inclined portion from the optical axis is P1, and an optical path that extends from the end of the diffusion plate 40 across the central axis 112 (or the optical axis 111) of the light source cover 150 to P1 A point where the inner surface of the light source cover 150, that is, the first incident surface 151a intersects is defined as P2. The distance between the point P1 and the central axis 112 is expressed as Dh, and the distance between the point P2 and the central axis 112 is expressed as Dn. At this time, in this embodiment, in order to suppress light having an angle θg or less that becomes glare light, the inclination angle θα formed by the first incident surface 151a and the emission surface 152b satisfies the following formula (4). ing.
θg <90−θα−sin ⁻¹ (n × sin × (sin ⁻¹ ((sin (tan ⁻¹ (Ww / H))) / n) −θα)) (4)
However, Ww = Wk / 2 + Dn

図１４および図１５は、照明器具２００の効果を説明するための配光分布図である。図１４および図１５は光軸１１を通る平面の配光分布であり、図１４はｘ−ｙ平面、図１５はｙ−ｚ平面の配光分布をそれぞれ示す。なお、実施の形態１における図７および図８と同様、光軸方向を０度とし、いずれの図においても比較対象として従来の照明器具の配光分布をあわせて示す。ＬＥＤ１０を出射した光は拡散板４０を介しプリズムシート１９０に入射する。プリズムシート１９０は出射面に稜線がｘ方向のプリズムを設けているので、ｙ−ｚ平面内において光軸１１方向に光を屈折し出射する。結果、図１５に示すようにｙ−ｚ平面内において角度が大きい光を抑制し、長手方向のグレア光も低減できる。また、光源カバー１５０を曲面とすることによる効果については、傾斜部１５２の位置によらずグレアを抑制する角度θｂを一定にすることができると共に光源カバー１５０の薄型化が可能となる。また、反射部１５３の外表面である反射面１５３ｂも傾斜部１５２と同様に曲面にすることにより精密な光の角度制御ができる。 14 and 15 are light distribution diagrams for explaining the effects of the lighting fixture 200. FIG. 14 and 15 show the light distribution on the plane passing through the optical axis 11, FIG. 14 shows the light distribution on the xy plane, and FIG. 15 shows the light distribution on the yz plane. 7 and 8 in the first embodiment, the optical axis direction is set to 0 degree, and the light distribution of the conventional lighting fixture is also shown as a comparison target in any of the drawings. The light emitted from the LED 10 enters the prism sheet 190 via the diffusion plate 40. Since the prism sheet 190 is provided with a prism whose ridge line is in the x direction on the exit surface, the prism sheet 190 refracts and emits light in the direction of the optical axis 11 in the yz plane. As a result, as shown in FIG. 15, the light having a large angle in the yz plane can be suppressed, and the glare light in the longitudinal direction can also be reduced. As for the effect of making the light source cover 150 a curved surface, the angle θb at which glare is suppressed can be made constant regardless of the position of the inclined portion 152 and the light source cover 150 can be made thinner. In addition, the reflective surface 153b, which is the outer surface of the reflective portion 153, is also curved like the inclined portion 152, so that precise angle control of light can be performed.

プリズムシート１９０は略三角形状の凹凸を有するものに限らず、略台形あるいは波型などの凹凸であってもよく、基板長手方向の配光を光軸方向に向ける機能があればよい。 The prism sheet 190 is not limited to having substantially triangular irregularities, and may be substantially trapezoidal or corrugated, as long as it has a function of directing light distribution in the longitudinal direction of the substrate in the optical axis direction.

実施の形態３．
図１６は本発明の実施の形態３にかかる照明器具３００の断面図であり、図１７および図１８はその拡大断面図である。実施の形態３にかかる照明器具３００は、拡散板２４０および光源カバー２５０を有する点において実施の形態１にかかる照明器具１００と相違している。以下、実施の形態１と異なる事項について主に説明する。実施の形態１と同じ構成要素には同一の符号を付す。説明を省略した事項は実施の形態１と同様である。 Embodiment 3 FIG.
FIG. 16 is a cross-sectional view of a lighting fixture 300 according to Embodiment 3 of the present invention, and FIGS. 17 and 18 are enlarged cross-sectional views thereof. The luminaire 300 according to the third embodiment is different from the luminaire 100 according to the first embodiment in that it includes a diffusion plate 240 and a light source cover 250. Hereinafter, items different from the first embodiment will be mainly described. The same components as those in the first embodiment are denoted by the same reference numerals. Matters whose description is omitted are the same as those in the first embodiment.

照明器具３００は、表面に複数のＬＥＤ１０が並べて実装された基板２２０と、基板２２０の裏面に接続する筐体２３０と、器具本体部２３１を備えている。光源カバー２５０は、光源カバー５０と同様に、均厚部２５１、傾斜部２５２、および反射部２５３を備えている。照明器具３００は、入光面２４０ａおよび出射面２４０ｂを備え出射面２４０ｂに凸となる形状の拡散板２４０を備えている。図１７の線Ｌ１は、幅Ｗｋの拡散板２４０の端と、光源カバー２５０における幅Ｗｅを有する第一入射面２５１ａの端とを、中心軸２１１をまたいで結んだ仮想線である。仮想線Ｌ１を越えない範囲で、拡散板２４０の出射面２４０ｂを光源カバー２５０側に凸形状としている。より具体的には、図１６では、凸形状を仮想線の内接円としている。なお、本実施の形態においては、拡散板２４０は、二色成形により一体で構成され、図１６〜１８における斜線部分が拡散透過材で構成され、その他の部分は高反射部材で構成されている。 The lighting fixture 300 includes a substrate 220 on which a plurality of LEDs 10 are mounted side by side, a housing 230 connected to the back surface of the substrate 220, and a fixture body 231. Similar to the light source cover 50, the light source cover 250 includes a uniform thickness portion 251, an inclined portion 252, and a reflection portion 253. The luminaire 300 includes a light diffusing plate 240 that includes a light incident surface 240a and an output surface 240b and is convex to the output surface 240b. A line L1 in FIG. 17 is an imaginary line connecting the end of the diffuser plate 240 having the width Wk and the end of the first incident surface 251a having the width We in the light source cover 250 across the central axis 211. The exit surface 240b of the diffuser plate 240 is convex toward the light source cover 250 within a range not exceeding the virtual line L1. More specifically, in FIG. 16, the convex shape is an inscribed circle of a virtual line. In the present embodiment, the diffuser plate 240 is integrally formed by two-color molding, the hatched portion in FIGS. 16 to 18 is made of a diffuse transmission material, and the other portion is made of a highly reflective member. .

次に、図１７および図１８で作用と効果を説明する。拡散板２４０を凸形状にすることで、ＬＥＤ１０と拡散板２４０までの距離を平板と比較し長くすることができ、ＬＥＤ１０の光源カバー２５０表面の輝度を緩和すると共にＬＥＤ１０が離散的に配置されることによる明暗むらを軽減することができ、見栄えが改善する。また、図１８で示すように拡散板２４０の入光面２４０ａにおいてＬＥＤ１０から照射された光の入射角θ１を、その下方に比較例として示す平板の場合の入射角θ２と比べて、小さくすることができる。よって空気と拡散板２４０との屈折率差によって生ずる界面での反射を低減することで光取り出し効率を向上することができる。 Next, operations and effects will be described with reference to FIGS. 17 and 18. By making the diffusing plate 240 convex, the distance between the LED 10 and the diffusing plate 240 can be made longer than that of a flat plate, and the brightness of the surface of the light source cover 250 of the LED 10 is reduced and the LEDs 10 are discretely arranged. The unevenness of light and darkness can be reduced, and the appearance is improved. Further, as shown in FIG. 18, the incident angle θ1 of the light irradiated from the LED 10 on the light incident surface 240a of the diffusion plate 240 is made smaller than the incident angle θ2 in the case of a flat plate shown as a comparative example below. Can do. Therefore, light extraction efficiency can be improved by reducing reflection at the interface caused by the difference in refractive index between air and the diffusion plate 240.

光源カバー２５０では、傾斜部２５２および反射部２５３の表面が段状に形成されている。このため、光源カバー２５０の厚みを薄く、かつ、厚さの差を少なく構成でき、成形性が格段に向上する。よって、より安価に、かつ、容易に製造することが可能となる。 In the light source cover 250, the surfaces of the inclined portion 252 and the reflecting portion 253 are formed in a step shape. For this reason, the thickness of the light source cover 250 can be reduced and the difference in thickness can be reduced, and the moldability is remarkably improved. Therefore, it becomes possible to manufacture more inexpensively and easily.

実施の形態４．
図１９は本発明の実施の形態４にかかる照明器具４００を示す図であり、図２０はその断面図である。照明器具４００は、ＬＥＤ３１０と筐体３３０、光源カバー３５０、ワイヤ３６０および電源ボックス３７０とを備える。図２０の断面図では、ワイヤ３６０および電源ボックス３７０を除いて図示している。光源カバー３５０は、光源カバー５０と同様に、均厚部３５１、傾斜部３５２、および反射部３５３を備えている。図２０に示す一点鎖線はＬＥＤ３１０の光軸３１１を表し、ＬＥＤ３１０から上側方向に光が出射される。なお、光源カバー３５０は、光軸３１１を回転軸として回転対称の形状を有する。ＬＥＤ３１０は、ＣＯＢ（ＣｈｉｐｏｎＢｏａｒｄ）タイプのものを用いてもよい。具体的には、ＬＥＤ３１０は、セラミック基板上に波長４４０ｎｍ〜４８０ｎｍ程度の青色光を発するＬＥＤチップを高密度で直接実装し、その上に青色光を黄色光に波長変換する蛍光体を混入したシリコーン樹脂を配したＣＯＢタイプのＬＥＤを用いてもよい。ＬＥＤ３１０は、筐体３３０にネジ締結されている。筐体３３０は、好ましくはダイキャスト法で製造されたアルミニウム製である。なお、筐体３３０はＬＥＤ３１０を設けた面と反対の面にフィン形状が一体成形されており、ＬＥＤ３１０の熱は主に筐体３３０を介して放熱されている。電源ボックス３７０内にはＬＥＤ３１０を点灯するための電源回路（図示せず）が内蔵されており、ワイヤ３６０によりＬＥＤ３１０と電源ボックス３７０内の回路が結線されている。 Embodiment 4 FIG.
FIG. 19 is a view showing a lighting fixture 400 according to Embodiment 4 of the present invention, and FIG. 20 is a cross-sectional view thereof. The lighting fixture 400 includes an LED 310, a housing 330, a light source cover 350, a wire 360, and a power supply box 370. In the cross-sectional view of FIG. 20, the wires 360 and the power supply box 370 are omitted. Similar to the light source cover 50, the light source cover 350 includes a uniform thickness portion 351, an inclined portion 352, and a reflection portion 353. An alternate long and short dash line in FIG. 20 represents the optical axis 311 of the LED 310, and light is emitted upward from the LED 310. The light source cover 350 has a rotationally symmetric shape with the optical axis 311 as the rotation axis. The LED 310 may be a COB (Chip on Board) type. Specifically, the LED 310 is a silicone substrate in which LED chips that emit blue light having a wavelength of about 440 nm to 480 nm are directly mounted on a ceramic substrate at a high density, and a phosphor that converts the wavelength of blue light into yellow light is mixed thereon. A COB type LED provided with a resin may be used. The LED 310 is screwed to the housing 330. The housing 330 is preferably made of aluminum manufactured by a die casting method. Note that the housing 330 is integrally formed with a fin shape on the surface opposite to the surface on which the LED 310 is provided, and heat of the LED 310 is mainly radiated through the housing 330. A power supply circuit (not shown) for lighting the LED 310 is built in the power supply box 370, and the LED 310 and a circuit in the power supply box 370 are connected by a wire 360.

上記実施の形態に記した照明器具１００、２００、３００、４００は本発明にかかる照明器具の１例に過ぎず、本発明の趣旨を逸脱しない範囲で変更および組み合わせが可能である。本実施の形態においては発光素子としてＬＥＤを用いているがこれに限らずＬＤ（ＬａｓｅｒＤｉｏｄｅ）あるいは有機ＥＬ素子などであってもよい。また、基板、拡散板、光源カバー、および筐体等の材料は本実施の形態において好ましい形態として記載したものに限定されるものではなく、上述した光学的機能を有するものであれば適宜に変更してもよい。また、光源カバーに拡散材を混ぜることにより拡散機能を併せ持たせてもよい。ただし、拡散機能の強化に伴い、グレア光を抑制する配光制御機能が低下するため、求める性能に合わせて適宜調整すればよい。 The lighting fixtures 100, 200, 300, and 400 described in the above embodiment are merely examples of the lighting fixture according to the present invention, and can be changed and combined without departing from the spirit of the present invention. In the present embodiment, an LED is used as a light emitting element. However, the present invention is not limited to this, and an LD (Laser Diode) or an organic EL element may be used. In addition, the materials such as the substrate, the diffusion plate, the light source cover, and the housing are not limited to those described as preferred embodiments in the present embodiment, and may be appropriately changed as long as they have the optical functions described above. May be. Further, a diffusion function may be provided by mixing a diffusion material into the light source cover. However, as the diffusion function is strengthened, the light distribution control function for suppressing the glare light is lowered, so that it may be appropriately adjusted according to the required performance.

図２１および図２２を用いて、実施の形態の更なる変形例について説明する。図２１は、実施の形態の変形例にかかる光源カバー４５０の断面図である。光源カバー４５０は、光源カバー５０と同様に、均厚部４５１、傾斜部４５２、および反射部４５３を備えている。図２１に示す光源カバー４５０は、断面が均一な厚さの曲面形状である均厚部４５１を備えている。均厚部４５１は、ＬＥＤ１０の側を向く内面とこの内面と対向する外面がともに同一の曲率半径を有するようにされている。この光源カバー４５０を照明器具１００〜４００に用いても良い。 A further modification of the embodiment will be described with reference to FIGS. 21 and 22. FIG. 21 is a cross-sectional view of a light source cover 450 according to a modification of the embodiment. Similar to the light source cover 50, the light source cover 450 includes a uniform thickness portion 451, an inclined portion 452, and a reflection portion 453. The light source cover 450 shown in FIG. 21 includes a thickness-equalizing portion 451 that is a curved surface with a uniform cross section. The uniform thickness portion 451 is configured such that both the inner surface facing the LED 10 and the outer surface facing the inner surface have the same radius of curvature. You may use this light source cover 450 for the lighting fixtures 100-400.

図２２は、実施の形態の変形例にかかる照明器具５００の図である。照明器具５００は、光源カバー５５０を備えている。光源カバー５５０は、図２２に示すように均厚部５５１と傾斜部５５２のみで構成されている。その一方で、照明器具５００では反射機能を筐体に持たせる構造としている。この際、筐体４３０の反射面は鏡面反射とすることが好ましい。 Drawing 22 is a figure of lighting fixture 500 concerning the modification of an embodiment. The lighting fixture 500 includes a light source cover 550. The light source cover 550 includes only a uniform thickness portion 551 and an inclined portion 552 as shown in FIG. On the other hand, the lighting fixture 500 has a structure in which the casing has a reflection function. At this time, it is preferable that the reflection surface of the housing 430 be specular reflection.

なお、上述した各実施の形態にかかる照明器具１００〜５００によれば、ルーパを設けなくともグレア光を抑制できるので、照明器具の大型化を抑制しつつグレア光対策ができるという効果もある。 In addition, according to the lighting fixtures 100-500 concerning each embodiment mentioned above, since glare light can be suppressed without providing a looper, there also exists an effect that a glare light countermeasure can be performed, suppressing the enlargement of a lighting fixture.

１００、２００、３００、４００、５００照明器具、１０ＬＥＤ、１１、１１１、２１１、３１１光軸、２０基板、３０、２３０筐体、２３１器具本体部、４０、２４０拡散板、５０、１５０、２５０、３５０、４５０、５５０光源カバー、５１、１５１、２５１、３５１、４５１、５５１均厚部、５１ａ、１５１ａ、２５１ａ第一入射面、５１ｂ出射面、５２、１５２、２５２、３５２、４５２、５５２傾斜部、５２ｂ、１５２ｂ出射面、５３、１５３、２５３反射部、５３ａ、１５３ａ第二入射面、５３ｂ、１５３ｂ反射面、５４側板、８０反射板、１１２中心軸、１９０プリズムシート、２４０ａ入光面、２４０ｂ出射面 100, 200, 300, 400, 500 Lighting fixture, 10 LED, 11, 111, 211, 311 Optical axis, 20 substrate, 30, 230 housing, 231 fixture main body, 40, 240 Diffuser plate, 50, 150, 250 , 350, 450, 550 Light source cover, 51, 151, 251, 351, 451, 551 Thicknessed part, 51a, 151a, 251a First entrance surface, 51b Exit surface, 52, 152, 252, 352, 452, 552 Inclination Part, 52b, 152b exit surface, 53, 153, 253 reflector, 53a, 153a second entrance surface, 53b, 153b reflector, 54 side plate, 80 reflector, 112 central axis, 190 prism sheet, 240a light entrance surface, 240b Outgoing surface

Claims

A light emitting element;
A rectangular substrate on which the light emitting elements are mounted along the longitudinal direction;
A housing in which the substrate is disposed;
A light source cover having a long shape and provided on the casing so as to cover the light emitting element;
With
The light source cover has a reflective surface on the lateral side of the substrate,
The lighting apparatus according to claim 1, wherein the reflecting surface reflects light from the light emitting element in a direction approaching an optical axis of the light emitting element.

The light source cover has a facing surface facing the substrate,
The lighting apparatus according to claim 1, wherein the reflecting surface is provided between the facing surface and the housing.

A plurality of the reflective surfaces;
The plurality of reflecting surfaces are respectively provided at both ends of the opposing surface in the short direction,
The luminaire according to claim 2, wherein an interval between the plurality of reflecting surfaces decreases as the distance from the housing approaches the housing.

The lighting apparatus according to claim 2, wherein the facing surface and the reflecting surface are integrated.

The lighting apparatus according to claim 1, wherein the reflection surface is formed on an outer periphery of the light source cover.