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JP5167099B2 - Lighting device - Google Patents

Lighting device Download PDF

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Publication number
JP5167099B2
JP5167099B2 JP2008313547A JP2008313547A JP5167099B2 JP 5167099 B2 JP5167099 B2 JP 5167099B2 JP 2008313547 A JP2008313547 A JP 2008313547A JP 2008313547 A JP2008313547 A JP 2008313547A JP 5167099 B2 JP5167099 B2 JP 5167099B2
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light
optical axis
color conversion
conversion member
focal point
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JP2010140674A (en
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良二 横谷
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Priority to JP2008313547A priority Critical patent/JP5167099B2/en
Priority to PCT/JP2009/070600 priority patent/WO2010067817A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/06—Optical design with parabolic curvature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

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

Description

本発明は、照明装置に関するものである。   The present invention relates to a lighting device.

従来から、白色ＬＥＤからなる発光装置と、発光装置からの光の配光を制御する反射鏡とを備えた照明装置が提案されている（特許文献１参照）。特許文献１に記載された照明装置では、前記反射鏡が、碗状に形成されるとともに内側面の形状が前記照明装置の光軸に対して回転対称である曲面となるように形成している。この種の照明装置として、図６に示す構成の照明装置がある。   2. Description of the Related Art Conventionally, there has been proposed an illuminating device including a light emitting device composed of a white LED and a reflecting mirror that controls light distribution from the light emitting device (see Patent Document 1). In the illuminating device described in Patent Document 1, the reflecting mirror is formed in a bowl shape, and the shape of the inner surface is a curved surface that is rotationally symmetric with respect to the optical axis of the illuminating device. . As this type of lighting device, there is a lighting device having a configuration shown in FIG.

図６に示す構成の照明装置は、発光素子としてＬＥＤチップ１を用いた発光装置Ａ’と、碗状に形成され発光装置Ａ’から放射される光の配光を制御する反射鏡８’とを備えている。ここで、発光装置Ａ’は、青色光を放射するＬＥＤチップ１と、ＬＥＤチップ１が一表面側に実装された基板２と、ＬＥＤチップ１から放射される青色光によって励起され黄色系の光（以下、黄色光と称す。）を放射する蛍光体（以下、黄色蛍光体と称す。）を含有した透光性材料により形成された色変換部材である蛍光体キャップ４’とを有する。また、蛍光体キャップ４’は、ＬＥＤチップ１を基板２との間に囲む形で基板２の前記一表面側に配設されているものであって、回転楕円体の一部を構成する曲面からなるドーム状に形成されるとともに、当該曲面を構成する回転楕円体の長径方向が、発光装置Ａ’の光軸Ｍ１方向と一致するように設定されている。   The illuminating device having the configuration shown in FIG. 6 includes a light emitting device A ′ using the LED chip 1 as a light emitting element, and a reflecting mirror 8 ′ that is formed in a bowl shape and controls light distribution of light emitted from the light emitting device A ′. It has. Here, the light-emitting device A ′ includes an LED chip 1 that emits blue light, a substrate 2 on which the LED chip 1 is mounted on one surface side, and yellow light that is excited by blue light emitted from the LED chip 1. A phosphor cap 4 ′ that is a color conversion member formed of a translucent material containing a phosphor that emits (hereinafter referred to as yellow light) (hereinafter referred to as a yellow phosphor). The phosphor cap 4 ′ is disposed on the one surface side of the substrate 2 so as to surround the LED chip 1 with the substrate 2, and is a curved surface constituting a part of a spheroid. And the major axis direction of the spheroid forming the curved surface is set to coincide with the optical axis M1 direction of the light emitting device A ′.

ここに、ＬＥＤチップ１から放射された青色光と当該青色光によって励起される黄色蛍光体から放射された黄色光とが混合されることで白色光が形成される。   Here, white light is formed by mixing the blue light emitted from the LED chip 1 and the yellow light emitted from the yellow phosphor excited by the blue light.

ところで、図６に示す構成の照明装置が備える反射鏡８’の内側面８ｂ’では、発光装置Ａ’の光軸Ｍ１に対して回転対称であってＬＥＤチップ１と前記光軸Ｍ１とが交差する点Ｐ１に焦点が位置する放物面から構成されている。   By the way, on the inner side surface 8b ′ of the reflecting mirror 8 ′ provided in the illumination device having the configuration shown in FIG. 6, the LED chip 1 and the optical axis M1 intersect with each other, which is rotationally symmetrical with respect to the optical axis M1 of the light emitting device A ′. It is comprised from the paraboloid in which a focus is located in the point P1 to do.

従って、蛍光体キャップ４’の外側の表面上の点、例えば、蛍光体キャップ４’の表面上において蛍光体キャップ４’の頂点から離間した任意の点Ｐ３から、点Ｐ１と点Ｐ３とを通る方向で、反射鏡８’の内側面８ｂ’と交差する点Ｐ２に入射する光は、反射鏡８’によって前記光軸Ｍ１に平行な方向に反射される。ここで、蛍光体キャップ４’は、前述のように回転楕円体からなるドーム状に形成されているため、点Ｐ３における蛍光体キャップ４’の接平面に対する法線と、点Ｐ１と点Ｐ２とを結ぶ直線とは略一致する。更に、このことは、点Ｐ１と反射鏡８’の内側面８ｂ’上の任意の点とを結ぶ線上の蛍光体キャップ４’との交点についても同様のことが言える。例えば、図６に示すように、曲面状に形成された蛍光体キャップ４’の表面上の点Ｐ３から、点Ｐ３での接平面の法線方向Ｄ１１に放射される光は、反射鏡８’の内側面８ｂ’上の点Ｐ２において前記光軸Ｍ１に略平行な方向Ｄ１２へ反射される。一方、曲面状に形成された蛍光体キャップ４’の外側の表面上における蛍光体キャップ４’の頂点に位置する点Ｐ４から、点Ｐ４での接平面の法線方向とは交差する方向Ｄ２１に放射される光は、点Ｐ２において前記光軸Ｍ１に平行な方向と交差する方向Ｄ２２に反射される。また、曲面状に形成された蛍光体キャップ４’の外周面上における蛍光体キャップ４’と基板２の前記一表面との接合部近傍に位置する点Ｐ５から、点Ｐ５での接平面の法線方向とは交差する方向Ｄ３１に放射される光も、点Ｐ２において前記光軸Ｍ１に平行な方向と交差する方向Ｄ３２に反射される。   Accordingly, a point on the outer surface of the phosphor cap 4 ′, for example, an arbitrary point P3 spaced from the vertex of the phosphor cap 4 ′ on the surface of the phosphor cap 4 ′ passes through the points P1 and P3. The light incident on the point P2 that intersects the inner surface 8b ′ of the reflecting mirror 8 ′ in the direction is reflected by the reflecting mirror 8 ′ in a direction parallel to the optical axis M1. Here, since the phosphor cap 4 ′ is formed in a dome shape made of a spheroid as described above, the normal line to the tangent plane of the phosphor cap 4 ′ at the point P3, the points P1 and P2, and Is substantially coincident with the straight line connecting. Further, the same can be said for the intersection of the phosphor cap 4 'on the line connecting the point P1 and an arbitrary point on the inner surface 8b' of the reflecting mirror 8 '. For example, as shown in FIG. 6, the light emitted from the point P3 on the surface of the phosphor cap 4 ′ formed in a curved surface in the normal direction D11 of the tangential plane at the point P3 is reflected by the reflecting mirror 8 ′. Is reflected in a direction D12 substantially parallel to the optical axis M1 at a point P2 on the inner surface 8b ′. On the other hand, in the direction D21 intersecting with the normal direction of the tangential plane at the point P4 from the point P4 positioned at the vertex of the phosphor cap 4 ′ on the outer surface of the phosphor cap 4 ′ formed in a curved shape. The emitted light is reflected in a direction D22 that intersects the direction parallel to the optical axis M1 at the point P2. Further, the method of the tangent plane at the point P5 from the point P5 located in the vicinity of the joint portion between the phosphor cap 4 ′ and the one surface of the substrate 2 on the outer peripheral surface of the phosphor cap 4 ′ formed in a curved shape. The light radiated in the direction D31 intersecting the line direction is also reflected in the direction D32 intersecting the direction parallel to the optical axis M1 at the point P2.

ここで、照明装置から前方へ照射される光の照射パターンにおいて、前記光軸Ｍ１に平行な方向Ｄ１２に反射される光は、前記照射パターンの中央部に配光され、前記光軸Ｍ１と交差する方向Ｄ２２，Ｄ３２に反射される光は、前記照射パターンの周辺部に配光される。つまり、蛍光体キャップ４’の外側の表面上の点Ｐ３から、蛍光体キャップ４’の外側の表面上の点Ｐ３での接平面の法線方向Ｄ１１に放射される光は、前記照射パターンの中央部に配光され、蛍光体キャップ４’の外側の表面上の点Ｐ４および点Ｐ５から、蛍光体キャップ４’の外側の表面上の点Ｐ４および点Ｐ５での接平面の法線方向と交差する方向Ｄ２１，Ｄ３１に放射される光は、前記照射パターンの周辺部に配光されることになる。
特開２００１−３３２１０４号公報 Here, in the irradiation pattern of light irradiated forward from the illumination device, the light reflected in the direction D12 parallel to the optical axis M1 is distributed in the center of the irradiation pattern and intersects the optical axis M1. The light reflected in the directions D22 and D32 is distributed to the periphery of the irradiation pattern. That is, the light emitted from the point P3 on the outer surface of the phosphor cap 4 ′ to the tangential plane normal direction D11 at the point P3 on the outer surface of the phosphor cap 4 ′ The light is distributed in the center, and from the point P4 and the point P5 on the outer surface of the phosphor cap 4 ′, the normal direction of the tangential plane at the point P4 and the point P5 on the outer surface of the phosphor cap 4 ′ The light emitted in the intersecting directions D21 and D31 is distributed to the periphery of the irradiation pattern.
JP 2001-332104 A

しかしながら、図６に示す構成の照明装置に使用される発光装置Ａ’では、蛍光体キャップ４’の表面から放射される黄色光が、拡散配光を示す（図７の曲線イ）のに対して、蛍光体キャップ４’の表面から放射される青色光は、黄色光の配光特性に比べて蛍光体キャップ４’の外側の表面上の点Ｐ３での接平面の法線方向に指向性を有する配光特性を示す（図７の曲線ロ）。従って、蛍光体キャップ４’の外側の表面上の点から放射される光は、放射方向に依存し、放射方向と蛍光体キャップ４’の外側の表面上の点での接平面の法線方向とのなす角度が小さいほど青色光の比率が高くなる。なお、青色光の配光特性が蛍光体キャップ４’の外側の表面上の点での接平面の法線方向に指向性を有するのは、ＬＥＤチップ１から放射された青色光であって蛍光体キャップ４’に含まれる黄色蛍光体で反射されずに蛍光体キャップ４’を透過する成分が含まれることによる。例えば、曲面状に形成された蛍光体キャップ４’の外側の表面上の点Ｐ３から放射される光は、点Ｐでの接平面の法線方向Ｄ１１に放射される光が最も青色光の比率が高く、一方、放射方向と点Ｐ３での法線方向とのなす角度が大きくなるほど黄色光の比率が高くなる。即ち、点Ｐ３から、前記法線方向Ｄ１１と交差する方向Ｄ４１へ放射される光は、前記法線方向Ｄ１１に放射される光に比べて黄色光の比率が高い。   However, in the light emitting device A ′ used in the illumination device having the configuration shown in FIG. 6, the yellow light emitted from the surface of the phosphor cap 4 ′ shows a diffuse light distribution (curve A in FIG. 7). Thus, the blue light emitted from the surface of the phosphor cap 4 ′ has directivity in the normal direction of the tangential plane at the point P3 on the outer surface of the phosphor cap 4 ′ as compared with the light distribution characteristic of yellow light. A light distribution characteristic having a curve (curve (b) in FIG. 7) is shown. Accordingly, the light emitted from a point on the outer surface of the phosphor cap 4 'depends on the radiation direction, and the normal direction of the radiation direction and the tangential plane at the point on the outer surface of the phosphor cap 4'. The smaller the angle between the two, the higher the ratio of blue light. The light distribution characteristic of blue light has directivity in the normal direction of the tangent plane at a point on the outer surface of the phosphor cap 4 ′ is blue light emitted from the LED chip 1 and fluorescent. This is because a component that is not reflected by the yellow phosphor contained in the body cap 4 ′ and passes through the phosphor cap 4 ′ is included. For example, the light emitted from the point P3 on the outer surface of the phosphor cap 4 ′ formed in a curved surface is the ratio of the blue light most emitted in the normal direction D11 of the tangential plane at the point P. On the other hand, as the angle formed between the radiation direction and the normal direction at the point P3 increases, the ratio of yellow light increases. In other words, the light emitted from the point P3 in the direction D41 intersecting the normal direction D11 has a higher ratio of yellow light than the light emitted in the normal direction D11.

従って、図６に示す構成の照明装置では、照明装置から前方へ照射される光の照射パターンにおいて、前記照射パターンの中央部は、青色がかった色となり、前記照射パターンの周辺部は、黄色がかった色となり、前記照射パターンの中央部と周辺部とで色むらが顕著となることがあった。   Therefore, in the illumination device having the configuration shown in FIG. 6, in the irradiation pattern of light emitted forward from the illumination device, the central portion of the irradiation pattern has a blueish color, and the peripheral portion of the irradiation pattern has a yellowish color. In some cases, the color unevenness becomes conspicuous between the central portion and the peripheral portion of the irradiation pattern.

本願発明は、前記事由に鑑みて為されたものであり、その目的は、前方へ照射される光の照射パターンに生じる色むらを軽減することができる照明装置を提供することにある。   This invention is made | formed in view of the said reason, The objective is to provide the illuminating device which can reduce the color nonuniformity which arises in the irradiation pattern of the light irradiated ahead.

請求項１の発明は、発光素子と当該発光素子が一表面側に実装された基板と発光素子から放射される光によって励起され当該光の色とは異なる色の光を放射する蛍光体を含有した透光性材料により表面が曲面状のドーム状に形成された色変換部材とを有する発光装置と、基板の前記一表面側において色変換部材を囲む形で配設され発光装置から放射される光の配光を制御する反射鏡とを備え、色変換部材は、発光素子を基板との間に囲む形で基板の前記一表面側に配設されてなり、反射鏡は、内側面の形状が、色変換部材の表面および内部のいずれかにおける前記発光装置の光軸から前記光軸とは直交する方向に離間した位置に焦点が位置する少なくとも１つの放物線を前記光軸の周りに回転して形成される曲面から構成されてなることを特徴とする。   The invention of claim 1 includes a light emitting element, a substrate on which the light emitting element is mounted on one surface side, and a phosphor that is excited by light emitted from the light emitting element and emits light of a color different from the color of the light. A light-emitting device having a color conversion member whose surface is formed into a dome shape with a curved surface by the translucent material, and is disposed on the one surface side of the substrate so as to surround the color conversion member and is emitted from the light-emitting device The color conversion member is disposed on the one surface side of the substrate so as to surround the light emitting element with the substrate, and the reflection mirror has the shape of the inner surface. However, rotating at least one parabola whose focal point is located around the optical axis at a position separated from the optical axis of the light emitting device in a direction orthogonal to the optical axis either on the surface or inside of the color conversion member. It is composed of curved surfaces formed by To.

この発明によれば、反射鏡の内側面が、色変換部材の表面および内部のいずれかにおける発光装置の光軸から当該光軸とは直交する方向に離間した位置に焦点が位置する少なくとも１つの放物線を前記光軸の周りに回転して形成される曲面から構成された形状に形成されていることにより、照明装置から前方へ照射される光の照射パターンにおいて、中央部と周辺部との間で生じる発光素子から放射される光と前記発光素子から放射される光とは色が異なる光との比率の差異を低減することができるので、前記照射パターンに生じる色むらを軽減することができる。   According to the present invention, the inner surface of the reflecting mirror has at least one focal point located at a position separated from the optical axis of the light emitting device either in the surface or inside of the color conversion member in a direction perpendicular to the optical axis. In the irradiation pattern of light radiated forward from the lighting device, it is formed between the central portion and the peripheral portion by being formed into a shape composed of a curved surface formed by rotating a parabola around the optical axis. Since the difference in the ratio between the light emitted from the light emitting element and the light emitted from the light emitting element having different colors can be reduced, the color unevenness occurring in the irradiation pattern can be reduced. .

請求項２の発明は、請求項１の発明において、前記反射鏡は、前記内側面の形状が、前記色変換部材の前記表面および前記内部のいずれかにおける前記光軸から前記光軸とは直交する方向に離間した位置に前記焦点が位置する複数の前記放物線を前記光軸の周りに回転して形成される複数の前記曲面から構成されてなり、且つ、前記内側面における前記色変換部材の表面から離れた部位を構成する前記曲面ほど前記放物線の前記焦点が前記色変換部材の頂点の近くに位置するように形成されてなることを特徴とする。   According to a second aspect of the present invention, in the first aspect of the invention, the reflecting mirror is configured such that the shape of the inner surface is orthogonal to the optical axis from the optical axis at either the surface or the interior of the color conversion member. A plurality of the curved surfaces formed by rotating the parabolas whose focal points are located at positions separated in a direction around the optical axis, and the color conversion member of the inner side surface The curved surface constituting the part farther from the surface is formed such that the focal point of the parabola is located closer to the vertex of the color conversion member.

この発明によれば、前記反射鏡の前記内側面が、複数の前記曲面から構成され且つ前記内側面における前記色変換部材の前記表面から離れた部位を構成する前記曲面を形成する前記放物線ほど前記焦点が前記色変換部材の頂点の近くに位置するように形成されていることにより、前記反射鏡の前記内側面で反射される光を前記反射鏡の外側に取り出すための前記反射鏡の前記端部の開口径が小さくなるように前記内側面の形状を形成することが可能なので、前記反射鏡のサイズを小さくすることができるから、照明装置のコンパクト化が図れる。   According to this invention, the parabola that forms the curved surface that constitutes the portion of the inner surface that is formed of a plurality of the curved surfaces and that is apart from the surface of the color conversion member on the inner surface, as described above. The end of the reflecting mirror for taking out the light reflected by the inner surface of the reflecting mirror to the outside of the reflecting mirror is formed so that the focal point is located near the vertex of the color conversion member. Since the shape of the inner side surface can be formed so that the opening diameter of the part is reduced, the size of the reflecting mirror can be reduced, so that the illumination device can be made compact.

請求項３の発明は、請求項１または請求項２の発明において、前記焦点は、前記色変換部材の前記表面上と前記色変換部材の前記内部における前記色変換部材の表面に沿った仮想曲面上とのいずれかに位置し、前記色変換部材の前記表面上と前記仮想曲面上とのいずれかの前記焦点での接平面の法線が前記曲面と交差するように設定されてなることを特徴とする。   According to a third aspect of the present invention, in the first or second aspect of the present invention, the focal point is a virtual curved surface along the surface of the color conversion member on the surface of the color conversion member and in the interior of the color conversion member. The normal line of the tangent plane at the focal point on either the surface or the virtual curved surface of the color conversion member is set so as to intersect the curved surface. Features.

この発明によれば、前記焦点が、前記色変換部材の前記表面上と前記色変換部材の前記内部における前記色変換部材の表面に沿った仮想曲面上とのいずれかの前記焦点での接平面の法線と前記曲面とが交差するように設定されていることにより、照明装置から前方へ照射される光の照射パターンにおいて、前記色変換部材の前記表面から前記色変換部材の前記表面上と前記色変換部材の前記内部における前記色変換部材の前記表面に沿った仮想曲面上とのいずれかに位置する前記焦点での接平面の法線方向に放射して前記反射鏡に入射する光を前記照射パターンの中央部に配光することができるので、前記照射パターンに生じる色むらを軽減することができる。   According to this invention, the focal point is a tangent plane at the focal point either on the surface of the color conversion member or on a virtual curved surface along the surface of the color conversion member inside the color conversion member. By setting the normal line and the curved surface to intersect, in the irradiation pattern of light irradiated forward from the lighting device, from the surface of the color conversion member to the surface of the color conversion member The light that radiates in the normal direction of the tangent plane at the focal point located at any one of the virtual curved surface along the surface of the color conversion member inside the color conversion member and enters the reflecting mirror Since the light can be distributed to the central portion of the irradiation pattern, color unevenness generated in the irradiation pattern can be reduced.

請求項４の発明は、請求項３の発明において、前記反射鏡の前記光軸に平行な方向における前記基板側とは反対側の端部に位置する前記曲面を形成する前記放物線の前記焦点は、前記焦点での接平面の前記法線が前記反射鏡の前記端部に交差するように設定されてなることを特徴とする。   According to a fourth aspect of the present invention, in the invention of the third aspect, the focal point of the parabola that forms the curved surface that is located at an end opposite to the substrate side in a direction parallel to the optical axis of the reflecting mirror is The normal line of the tangent plane at the focal point is set so as to intersect the end portion of the reflecting mirror.

この発明によれば、前記反射鏡の前記光軸方向における前記発光装置とは反対側の端部に位置する前記曲面を形成する前記放物線の前記焦点が、前記焦点での接平面の前記法線と前記反射鏡の前記端部に交差するように設定されていることにより、照明装置から前方へ照射される光の照射パターンにおいて、前記色変換部材の前記表面における比較的輝度が高い部位から放射した光を前記照射パターンの中央部に配光することができるので、照明装置の正面光度を高めることができる。   According to this invention, the focal point of the parabola that forms the curved surface located at the end opposite to the light emitting device in the optical axis direction of the reflecting mirror is the normal line of the tangential plane at the focal point. Radiating from a relatively high brightness portion on the surface of the color conversion member in the irradiation pattern of light irradiated forward from the illumination device. Since the emitted light can be distributed to the central portion of the irradiation pattern, the front luminance of the illumination device can be increased.

請求項１の発明によれば、反射鏡の内側面が、色変換部材の表面および内部のいずれかにおける発光装置の光軸から当該光軸とは直交する方向に離間した位置に焦点が位置する放物線を前記光軸の周りに回転して形成される曲面から構成されていることにより、照明装置の前方の光の照射パターンにおいて、中央部と周辺部との間で生じる互いに色の異なる複数種類の光の比率の差異を低減することができるので、前記照射パターンに生じる色むらを軽減することができる。   According to the first aspect of the present invention, the focal point is located at a position where the inner side surface of the reflecting mirror is spaced apart from the optical axis of the light emitting device on the surface and inside of the color conversion member in a direction perpendicular to the optical axis. Plural kinds of different colors generated between the central part and the peripheral part in the light irradiation pattern in front of the lighting device by being composed of a curved surface formed by rotating a parabola around the optical axis Since the difference in the light ratio can be reduced, color unevenness occurring in the irradiation pattern can be reduced.

（実施形態１）
以下、実施形態１について図１に基づいて説明する。 (Embodiment 1)
Hereinafter, Embodiment 1 will be described with reference to FIG.

本実施形態の照明装置は、図１（ａ）に示すように、発光素子としてＬＥＤチップ１を用いた発光装置Ａと、碗状に形成され且つ発光装置Ａから放射された光を反射して配光を制御する反射鏡８とを備える。   As shown in FIG. 1A, the illumination device of the present embodiment reflects the light emitted from the light emitting device A and the light emitting device A using the LED chip 1 as a light emitting element. And a reflecting mirror 8 for controlling the light distribution.

また、本実施形態の照明装置は、図１（ａ）に示すように、有底円筒状に形成されるとともに反射鏡８が内部に収納された筐体６と、筐体６の前面側に装着される透明カバー１０と、筐体６の前面開口部の周部に取り付けられ反射鏡８および透明カバー１０を保持するための保持枠９とを備えている。ここに、保持枠９は、内径が筐体６の前面開口部よりも小さく且つ外径が筐体６の外周径よりも大きい円環状部９ａと、当該円環状部９ａの一面側から円環状部９ａの全周に亘って突出した突出部９ｂとからなる形状に形成されている。保持枠９は、突出部９ｂの内側に筐体６の側壁６ｂの前端部が嵌入した状態で、突出部９ｂに穿設されたねじ挿通孔９ｃに挿通された複数本の取付ねじ９１を筐体６の側壁６ｂの前面開口部付近に形成されたネジ孔６ｃに螺合させることで、筐体６に取り付けられている。ここで、保持枠９が筐体６に取り付けられた状態では、保持枠９の円環状部９ａの前記一面側と筐体６の前面開口部の周部前面６ａとの間に、反射鏡８の前端縁から外方へ延設された外鍔部８ｃと外鍔部８ｃ上に載置された透明カバー１０とが挟持される。なお、筐体６は、Ａｌ等の金属材料で形成されている。また、透明カバー１０は、アクリル樹脂で形成されているが、アクリル樹脂に限らず、ポリカーボネイドやガラス等で形成してもよい。   In addition, as shown in FIG. 1A, the illumination device of the present embodiment is formed in a bottomed cylindrical shape and includes a housing 6 in which the reflecting mirror 8 is housed, and a front side of the housing 6. A transparent cover 10 to be mounted, and a holding frame 9 for holding the reflecting mirror 8 and the transparent cover 10 attached to the periphery of the front opening of the housing 6 are provided. Here, the holding frame 9 has an annular portion 9a having an inner diameter smaller than the front opening of the housing 6 and an outer diameter larger than the outer diameter of the housing 6, and an annular shape from one surface side of the annular portion 9a. It is formed in the shape which consists of the protrusion part 9b which protruded over the perimeter of the part 9a. The holding frame 9 has a plurality of mounting screws 91 inserted into the screw insertion holes 9c formed in the protruding portion 9b in a state where the front end portion of the side wall 6b of the housing 6 is fitted inside the protruding portion 9b. The body 6 is attached to the housing 6 by being screwed into a screw hole 6 c formed in the vicinity of the front opening of the side wall 6 b of the body 6. Here, in a state where the holding frame 9 is attached to the housing 6, the reflecting mirror 8 is provided between the one surface side of the annular portion 9 a of the holding frame 9 and the peripheral front surface 6 a of the front opening of the housing 6. The outer flange portion 8c extending outward from the front end edge and the transparent cover 10 placed on the outer flange portion 8c are sandwiched. The housing 6 is made of a metal material such as Al. Moreover, although the transparent cover 10 is formed of acrylic resin, it is not limited to acrylic resin, and may be formed of polycarbonate, glass, or the like.

発光装置Ａは、ＬＥＤチップ１と、ＬＥＤチップ１が一表面側に実装された基板２と、ＬＥＤチップ１から放射される光によって励起され当該光とは異なる色の光を放射する蛍光体を含有した透光性材料により形成されたドーム状の色変換部材である蛍光体キャップ４と、透光性材料で形成され且つＬＥＤチップ１と蛍光体キャップ４との間にＬＥＤチップ１を覆う形で設けられた略球状の曲面の一部から構成された凸レンズ状の透明部材からなる光学部材３とを備える。ここにおいて、蛍光体キャップ４は、ＬＥＤチップ１を基板２との間に囲む形で基板２の前記一表面側に配設されている。   The light emitting device A includes an LED chip 1, a substrate 2 on which the LED chip 1 is mounted on one surface side, and a phosphor that is excited by light emitted from the LED chip 1 and emits light of a color different from the light. A phosphor cap 4 that is a dome-shaped color conversion member formed of the translucent material contained, and a shape that is formed of the translucent material and covers the LED chip 1 between the LED chip 1 and the phosphor cap 4. And an optical member 3 made of a convex lens-shaped transparent member composed of a part of a substantially spherical curved surface. Here, the phosphor cap 4 is disposed on the one surface side of the substrate 2 so as to surround the LED chip 1 with the substrate 2.

また、発光装置Ａでは、ＬＥＤチップ１として、ＧａＮ系の青色ＬＥＤチップを用いている。蛍光体キャップ４に使用される蛍光体としては、ＬＥＤチップ１から放射された青色光によって励起されて黄色光を放射する粒子状の黄色蛍光体を用いている。ここで、ＬＥＤチップ１から放射され光学部材３および蛍光体キャップ４を透過した青色光と、蛍光体キャップ４の黄色蛍光体から放射された黄色光とが混合されることで白色光が形成される。なお、本実施形態では、ＬＥＤチップ１を１個だけ有する発光装置Ａを用いる例について説明したが、これに限定されず、ＬＥＤチップ１を複数個有する発光装置Ａを用いてもよい。   In the light emitting device A, a GaN blue LED chip is used as the LED chip 1. As the phosphor used for the phosphor cap 4, a particulate yellow phosphor that emits yellow light when excited by the blue light emitted from the LED chip 1 is used. Here, the blue light emitted from the LED chip 1 and transmitted through the optical member 3 and the phosphor cap 4 and the yellow light emitted from the yellow phosphor of the phosphor cap 4 are mixed to form white light. The In the present embodiment, the example using the light emitting device A having only one LED chip 1 has been described. However, the present invention is not limited thereto, and the light emitting device A having a plurality of LED chips 1 may be used.

基板２は、セラミック基板（例えば、アルミナセラミック基板、窒化アルミニウム基板等）からなる絶縁性基板の一表面側に金属材料（例えば、Ｃｕ）からなる通電用の配線パターン（図示せず）が形成されている。なお、基板２は、セラミック基板に限らず、ガラスエポキシ樹脂基板などを用いてもよい。また、本実施形態では、ＬＥＤチップ１が基板２の配線パターンの一部からなるダイパッド部（図示せず）に半田や銀ペースト等の各種接合材料を用いて接合されている。また、基板２は、筐体６の底壁６ｄに対して弾力性のある絶縁シート７により接合されている。更に、基板２は、複数本の固定ねじ６１により筐体６の底壁６ｄに固定されている。なお、絶縁シート７としては、例えば、シリカやアルミナ等のフィラーからなる充填材を含有し且つ加熱時に低粘度化する樹脂シート、例えば、溶融シリカを高充填して熱伝導率を高めたエポキシ樹脂シートである有機グリーンシート等を使用してもよい。また、絶縁シート７の厚みは、例えば、０．５ｍｍ程度に設定すればよいが、これに限定されるものではない。また、前記有機グリーンシートは、加熱時の樹脂流動性が高く凹凸面への密着性が高いという特徴がある。従って、絶縁シート７として前記有機グリーンシートを用いれば、絶縁シート７と基板２および筐体６の底壁６ｄとの間に空隙が発生するのを防止することができる。   The substrate 2 has a conductive wiring pattern (not shown) made of a metal material (for example, Cu) formed on one surface side of an insulating substrate made of a ceramic substrate (for example, an alumina ceramic substrate or an aluminum nitride substrate). ing. The substrate 2 is not limited to a ceramic substrate, and a glass epoxy resin substrate or the like may be used. In this embodiment, the LED chip 1 is bonded to a die pad portion (not shown) made of a part of the wiring pattern of the substrate 2 by using various bonding materials such as solder and silver paste. The substrate 2 is bonded to the bottom wall 6 d of the housing 6 by an insulating sheet 7 having elasticity. Further, the substrate 2 is fixed to the bottom wall 6 d of the housing 6 by a plurality of fixing screws 61. As the insulating sheet 7, for example, a resin sheet containing a filler made of a filler such as silica or alumina and having a low viscosity upon heating, for example, an epoxy resin having a high filling with fused silica to increase the thermal conductivity You may use the organic green sheet etc. which are sheets. Further, the thickness of the insulating sheet 7 may be set to about 0.5 mm, for example, but is not limited thereto. The organic green sheet is characterized by high resin fluidity during heating and high adhesion to the uneven surface. Therefore, when the organic green sheet is used as the insulating sheet 7, it is possible to prevent a gap from being generated between the insulating sheet 7 and the substrate 2 and the bottom wall 6 d of the housing 6.

光学部材３は、ＬＥＤチップ１と蛍光体キャップ４との間に設けられＬＥＤチップ１を封止している。また、光学部材３は、透光性材料としてシリコーン樹脂を採用しているが、シリコーン樹脂に限らず、エポキシ樹脂、ガラス等を採用してもよい。   The optical member 3 is provided between the LED chip 1 and the phosphor cap 4 and seals the LED chip 1. Moreover, although the optical member 3 employ | adopts a silicone resin as a translucent material, you may employ | adopt not only a silicone resin but an epoxy resin, glass, etc.

蛍光体キャップ４は、表面が回転楕円体を長径方向の中央で半分に分割してなる曲面から構成され、当該曲面を構成する回転楕円体の長径方向が、発光装置Ａの光軸Ｍ１方向と一致するように設定されている。また、前記回転楕円体は、長径の寸法と短径の寸法との比が６対５となるように設定されている。なお、蛍光体キャップ４は、表面が半球面となるように形成されたものであってもよい。   The phosphor cap 4 is composed of a curved surface formed by dividing the spheroid in half at the center in the major axis direction, and the major axis direction of the spheroid constituting the curved surface is the optical axis M1 direction of the light emitting device A. Set to match. The spheroid is set so that the ratio of the major axis dimension to the minor axis dimension is 6: 5. The phosphor cap 4 may be formed so that the surface is a hemispherical surface.

また、蛍光体キャップ４のＬＥＤチップ１側の内面と光学部材３の表面との間に空気層５が設けられている。従って、空気層５が設けられていることにより、蛍光体キャップ４内で黄色蛍光体により光学部材３側へ散乱される青色光および黄色蛍光体から発する黄色光が光学部材３を透過し基板２等に吸収されるのを抑制することができるので、発光装置Ａの光の取り出し効率を向上させることができる。また、空気層５が設けられていることにより、反射板８を筐体６の前面側から取り付ける際に、反射板８の一部が蛍光体キャップ４に接触しても、衝撃が光学部材３に伝わるのを防止することができるので、光学部材３およびＬＥＤチップ１が損傷するのを防ぐことができる。   An air layer 5 is provided between the inner surface of the phosphor cap 4 on the LED chip 1 side and the surface of the optical member 3. Therefore, by providing the air layer 5, the blue light scattered by the yellow phosphor to the optical member 3 side in the phosphor cap 4 and the yellow light emitted from the yellow phosphor pass through the optical member 3 and pass through the substrate 2. Therefore, the light extraction efficiency of the light-emitting device A can be improved. Further, since the air layer 5 is provided, when the reflector 8 is attached from the front side of the housing 6, even if a part of the reflector 8 comes into contact with the phosphor cap 4, the impact is applied to the optical member 3. Therefore, the optical member 3 and the LED chip 1 can be prevented from being damaged.

また、蛍光体キャップ４は、透明なシリコーン樹脂からなる透光性材料に前述の黄色蛍光体を均一に分散させた混合材料を用いて形成されている。なお、蛍光体キャップ４の材料として用いる透光性材料に含有させる蛍光体は、黄色蛍光体に限られず、例えば、赤色蛍光体と緑色蛍光体とを用いてもよい。また、蛍光体キャップ４の材料として用いる透光性材料は、シリコーン樹脂に限らず、例えば、エポキシ樹脂、アクリル樹脂、ポリカーボネイドおよびガラス等を採用してもよい。   The phosphor cap 4 is formed using a mixed material in which the above-mentioned yellow phosphor is uniformly dispersed in a translucent material made of a transparent silicone resin. The phosphor contained in the translucent material used as the material of the phosphor cap 4 is not limited to the yellow phosphor, and for example, a red phosphor and a green phosphor may be used. Moreover, the translucent material used as the material of the phosphor cap 4 is not limited to the silicone resin, and, for example, an epoxy resin, an acrylic resin, polycarbonate, glass, or the like may be employed.

反射鏡８は、碗状に形成され、反射鏡８の底部には、発光装置Ａが挿入される発光装置挿入口８ａが形成されている。また、反射鏡８の材料としては、例えば、ＬＥＤチップ１や蛍光体から放射される光の反射率が高い金属（例えば、Ａｌ等）などを採用すればよく、本実施形態では、Ａｌを採用している。また、反射鏡８の内側面８ｂは、ＡｌやＡｇなどを蒸着することで所望の反射率を確保している。なお、反射鏡８の材料は金属に限らず、高耐熱の樹脂等を採用してもよい。   The reflecting mirror 8 is formed in a bowl shape, and a light emitting device insertion port 8 a into which the light emitting device A is inserted is formed at the bottom of the reflecting mirror 8. Moreover, as a material of the reflecting mirror 8, for example, a metal (for example, Al) having a high reflectance of light emitted from the LED chip 1 or the phosphor may be employed. In this embodiment, Al is employed. doing. Further, the inner surface 8b of the reflecting mirror 8 secures a desired reflectance by evaporating Al, Ag or the like. The material of the reflecting mirror 8 is not limited to a metal, and a high heat resistant resin or the like may be used.

ところで、反射鏡８の内側面８ｂは、蛍光体キャップ４の表面上において発光装置Ａの光軸Ｍ１から当該光軸Ｍ１とは直交する方向に離間した位置に焦点Ｆ１が位置する１つの放物線を前記光軸Ｍ１の周りに回転して形成される曲面から構成されている。図１（ｂ）に反射鏡８の内側面８ｂの形状と、蛍光体キャップ４の表面から放射して反射鏡８の内側面８ｂで反射される光の経路とについて、シミュレーションを行った結果を示す。図１（ｂ）において、縦軸は、前記光軸Ｍ１方向、横軸は当該光軸Ｍ１と直交する方向を表し、縦軸および横軸それぞれに記載した数値は、前記光軸Ｍ１と基板２の表面との交点から前記光軸Ｍ１方向および前記光軸Ｍ１と直交する方向への距離を表す。図１（ｂ）から、蛍光体キャップ４の表面における焦点Ｆ１に対応する位置から蛍光体キャップ４の表面上の焦点Ｆ１での接平面の法線方向へ放射される光だけでなく、蛍光体キャップ４の表面における焦点Ｆ１に対応する位置から当該法線方向とは交差する方向に放射される光も反射鏡８によって前記光軸Ｍ１に平行な方向へ反射されることが判る（図１（ｂ）の矢印参照）。   By the way, the inner surface 8b of the reflecting mirror 8 has a single parabola in which the focal point F1 is located on the surface of the phosphor cap 4 at a position separated from the optical axis M1 of the light emitting device A in a direction orthogonal to the optical axis M1. The curved surface is formed by rotating around the optical axis M1. FIG. 1 (b) shows the result of a simulation performed on the shape of the inner surface 8 b of the reflecting mirror 8 and the path of light emitted from the surface of the phosphor cap 4 and reflected by the inner surface 8 b of the reflecting mirror 8. Show. In FIG. 1B, the vertical axis represents the optical axis M1 direction, the horizontal axis represents the direction orthogonal to the optical axis M1, and the numerical values described on the vertical axis and the horizontal axis represent the optical axis M1 and the substrate 2 respectively. Represents the distance from the intersection with the surface to the direction of the optical axis M1 and the direction perpendicular to the optical axis M1. From FIG. 1B, not only the light emitted from the position corresponding to the focal point F1 on the surface of the phosphor cap 4 in the normal direction of the tangential plane at the focal point F1 on the surface of the phosphor cap 4, but also the phosphor. It can be seen that light radiated in a direction intersecting the normal direction from a position corresponding to the focal point F1 on the surface of the cap 4 is also reflected by the reflecting mirror 8 in a direction parallel to the optical axis M1 (FIG. 1 ( see arrow b)).

ここで、発光装置Ａでは、曲面状の蛍光体キャップ４の表面上の焦点Ｆ１での接平面の法線方向に放射される光が青色光の比率が最も高く、一方、放射方向と当該法線方向とのなす角度が大きくなるほど黄色光の比率が高くなっている。従って、本実施形態の照明装置では、ＬＥＤチップ１から放射され蛍光体キャップ４の表面における焦点Ｆ１に対応する位置から前記法線方向に放射される青色光の比率が高い光だけでなく、蛍光体キャップ４に含有された蛍光体から前記法線方向とは交差する方向に放射される黄色光の比率が高い光も前記光軸Ｍ１に平行な方向へ反射される。一方、蛍光体キャップ４の表面における焦点Ｆ１以外の任意の点（図示せず）に対応する位置から、反射鏡８の内側面８ｂに向かって方向へ放射される光は、前記光軸Ｍ１と交差する方向へ反射される。   Here, in the light emitting device A, the light emitted in the normal direction of the tangent plane at the focal point F1 on the surface of the curved phosphor cap 4 has the highest ratio of blue light, while the emission direction and the law The ratio of yellow light increases as the angle formed with the line direction increases. Therefore, in the illumination device according to the present embodiment, not only light with a high ratio of blue light emitted from the LED chip 1 and emitted in the normal direction from the position corresponding to the focal point F1 on the surface of the phosphor cap 4 is used. Light with a high ratio of yellow light emitted from the phosphor contained in the body cap 4 in a direction crossing the normal direction is also reflected in a direction parallel to the optical axis M1. On the other hand, light emitted in a direction toward the inner surface 8b of the reflecting mirror 8 from a position corresponding to an arbitrary point (not shown) other than the focal point F1 on the surface of the phosphor cap 4 is the optical axis M1. Reflected in the intersecting direction.

従って、照明装置から前方へ照射される光の照射パターンにおいて、蛍光体キャップ４の表面上における焦点Ｆ１に対応する位置から放射され前記照射パターンの中央部に配光される光の黄色光の比率を従来例の照明装置（図６参照）に比べて上昇させるとともに、前記照射パターンの周辺部に配光される光の青色光の比率を従来例の照明装置（図６参照）に比べて上昇させることができる。しかして、前記照射パターンにおいて、中央部と周辺部との間で生じるＬＥＤチップ１から放射される青色光と蛍光体キャップ４から放射される黄色光との比率の差異を低減することができるので、前記照射パターンに生じる色むらを軽減することができる。   Therefore, in the irradiation pattern of the light irradiated forward from the illumination device, the ratio of the yellow light of the light emitted from the position corresponding to the focal point F1 on the surface of the phosphor cap 4 and distributed to the central portion of the irradiation pattern Is increased as compared with the illumination device of the conventional example (see FIG. 6), and the ratio of the blue light of the light distributed to the periphery of the irradiation pattern is increased as compared with the illumination device of the conventional example (see FIG. 6). Can be made. Thus, in the irradiation pattern, the difference in the ratio between the blue light emitted from the LED chip 1 and the yellow light emitted from the phosphor cap 4 that occurs between the central portion and the peripheral portion can be reduced. The color unevenness generated in the irradiation pattern can be reduced.

なお、反射鏡８の内側面８ｂを構成する前記曲面を形成する前記放物線の焦点Ｆ１の位置は、蛍光体キャップ４の表面上に位置するものであれば、図１（ｂ）に示す位置に限定されない。また、本実施形態では、反射鏡８の内側面８ｂを構成する前記曲面を形成する前記放物線の焦点Ｆ１が蛍光体キャップ４の表面上に位置する例について説明したが、これに限定されるものではなく、焦点Ｆ１が蛍光体キャップ４の内部に位置するようにしても本実施形態と同様の効果が得られる。   In addition, if the position of the focal point F1 of the parabola that forms the curved surface constituting the inner surface 8b of the reflecting mirror 8 is located on the surface of the phosphor cap 4, the position shown in FIG. It is not limited. Moreover, although this embodiment demonstrated the example in which the focus F1 of the said parabola which forms the said curved surface which comprises the inner surface 8b of the reflective mirror 8 was located on the surface of the fluorescent substance cap 4, it is limited to this Instead, even if the focal point F1 is positioned inside the phosphor cap 4, the same effect as in the present embodiment can be obtained.

（実施形態２）
本実施形態の照明装置の基本構成は実施形態１とほぼ同じであり、図２（ｂ）に示すように、反射鏡８０の内側面８０ｂが、蛍光体キャップ４の表面上において発光装置Ａの光軸Ｍ１から当該光軸Ｍ１とは直交する方向に離間した位置に焦点Ｆ２が位置する放物線Ｐａ２（図２（ａ）参照）と、蛍光体キャップ４の表面上に焦点Ｆ３が位置する放物線Ｐａ３（図２（ａ）参照）とを前記光軸Ｍ１の周りに回転して形成される２つの曲面８２ｂ，８３ｂとからから構成されている点が相違する。ここで、曲面８２ｂを形成する放物線Ｐａ２の焦点Ｆ２に比べて、曲面８２ｂよりも蛍光体キャップ４の表面から離間した曲面８３ｂを形成する放物線Ｐａ３の焦点Ｆ３のほうが、蛍光体キャップ４の頂点の近くに位置している。なお、図２は、反射鏡８０の内側面８０ｂの形状と、蛍光体キャップ４の表面から放射して反射鏡８０の内側面８０ｂで反射される光の経路とについて、シミュレーションを行った結果を示す。図２において、縦軸は、発光装置Ａの光軸Ｍ１方向、横軸は光軸Ｍ１と直交する方向を表し、縦軸および横軸それぞれに記載した数値は、前記光軸Ｍ１と基板２の表面との交点から前記光軸Ｍ１方向および前記光軸Ｍ１と直交する方向への距離を表す。また、実施形態１の照明装置と同様の構成については同一の符号を付して説明を省略する。図２（ｂ）から、蛍光体キャップ４の表面上における焦点Ｆ２に対応する位置から放射した光のうち反射鏡８０の内側面８０ｂにおける曲面８２ｂに入射した成分と、蛍光体キャップ４の表面上における焦点Ｆ３に対応した位置から放射した光のうち内側面８０ｂにおける曲面８３ｂに入射した成分とが、反射鏡８０によって前記光軸Ｍ１に平行な方向に反射されることが判る（図２（ｂ）の矢印参照）。 (Embodiment 2)
The basic configuration of the illuminating device of the present embodiment is almost the same as that of the first embodiment. As shown in FIG. 2B, the inner side surface 80 b of the reflecting mirror 80 is formed on the surface of the phosphor cap 4 of the light emitting device A. A parabola Pa2 (see FIG. 2A) where the focal point F2 is located at a position separated from the optical axis M1 in a direction orthogonal to the optical axis M1, and a parabola Pa3 where the focal point F3 is located on the surface of the phosphor cap 4 (See FIG. 2 (a)) is different from the two curved surfaces 82b and 83b formed by rotating around the optical axis M1. Here, compared to the focal point F2 of the parabola Pa2 that forms the curved surface 82b, the focal point F3 of the parabola Pa3 that forms the curved surface 83b that is farther from the surface of the phosphor cap 4 than the curved surface 82b is at the apex of the phosphor cap 4. Located nearby. FIG. 2 shows the result of simulation of the shape of the inner side surface 80b of the reflecting mirror 80 and the path of light emitted from the surface of the phosphor cap 4 and reflected by the inner side surface 80b of the reflecting mirror 80. Show. In FIG. 2, the vertical axis represents the direction of the optical axis M1 of the light emitting device A, the horizontal axis represents the direction orthogonal to the optical axis M1, and the numerical values described on the vertical axis and the horizontal axis represent the optical axis M1 and the substrate 2 respectively. It represents the distance from the intersection with the surface to the direction of the optical axis M1 and the direction orthogonal to the optical axis M1. Moreover, about the structure similar to the illuminating device of Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted. From FIG. 2B, the component incident on the curved surface 82 b on the inner side surface 80 b of the reflecting mirror 80 among the light emitted from the position corresponding to the focal point F <b> 2 on the surface of the phosphor cap 4, and the surface of the phosphor cap 4. It can be seen that the component incident on the curved surface 83b on the inner side surface 80b of the light emitted from the position corresponding to the focal point F3 is reflected by the reflecting mirror 80 in the direction parallel to the optical axis M1 (FIG. 2B). ) See arrow).

従って、照明装置から前方へ照射される光の照射パターンにおいて、蛍光体キャップ４の表面上の焦点Ｆ２および焦点Ｆ３に対応する位置から放射され前記照射パターンの中央部に配光される光の青色光の比率を従来例の照明装置（図６参照）に比べて上昇させるとともに、前記照射パターンの周辺部に配光される光の青色光の比率を従来例の照明装置（図６参照）に比べて上昇させることができる。しかして、前記照射パターンにおいて、中央部と周辺部との間で生じるＬＥＤチップ１から放射される青色光と蛍光体キャップ４から放射される黄色光との比率の差異を低減することができるので、前記照射パターンに生じる色むらを軽減することができる。   Therefore, in the irradiation pattern of the light irradiated forward from the illumination device, the blue color of the light emitted from the position corresponding to the focal point F2 and the focal point F3 on the surface of the phosphor cap 4 and distributed to the central portion of the irradiation pattern The ratio of light is increased compared to the conventional illumination device (see FIG. 6), and the ratio of blue light distributed to the periphery of the irradiation pattern is set to the conventional illumination device (see FIG. 6). It can be raised in comparison. Thus, in the irradiation pattern, the difference in the ratio between the blue light emitted from the LED chip 1 and the yellow light emitted from the phosphor cap 4 that occurs between the central portion and the peripheral portion can be reduced. The color unevenness generated in the irradiation pattern can be reduced.

ところで、実施形態１の照明装置では、図２（ｂ）に示すように、反射鏡８の内側面８ｂが単一の放物線を前記光軸Ｍ１の周りに回転して形成される曲面からなるため、蛍光体キャップ４のサイズを大きくした場合、焦点Ｆ１と前記曲面との間の距離を小さくすることにより反射鏡８のサイズの拡大を抑制することを目的として、焦点Ｆ１を蛍光体キャップ４の表面における蛍光体キャップ４と基板２の前記一表面との接合部近傍に設定することが考えられる。ところが、蛍光体キャップ４の表面における蛍光体キャップ４と基板２の前記一表面との接合部近傍は輝度が低いため、照明装置の正面光度が低下してしまう。   By the way, in the illuminating device of Embodiment 1, as shown in FIG.2 (b), since the inner surface 8b of the reflective mirror 8 consists of a curved surface formed by rotating a single parabola around the said optical axis M1. When the size of the phosphor cap 4 is increased, the focus F1 is placed on the phosphor cap 4 for the purpose of suppressing the enlargement of the size of the reflecting mirror 8 by reducing the distance between the focus F1 and the curved surface. It can be considered that the surface is set in the vicinity of the junction between the phosphor cap 4 and the one surface of the substrate 2. However, since the brightness of the vicinity of the junction between the phosphor cap 4 and the one surface of the substrate 2 on the surface of the phosphor cap 4 is low, the front luminance of the lighting device is lowered.

一方、蛍光体キャップ４のサイズを大きくした場合において、焦点Ｆ１を蛍光体キャップ４の表面上における比較的輝度が高い部位、即ち、蛍光体キャップ４の頂点の近くに設けると、焦点Ｆ１と反射鏡８の内側面８ｂを構成する前記曲面との間の距離が大きくなり、焦点Ｆ１と反射鏡８の内側面８ｂを構成する前記曲面の曲率が小さくなるので、反射鏡８のサイズが大きくなる。従って、照明装置のコンパクト化が図れない。   On the other hand, when the size of the phosphor cap 4 is increased, if the focal point F1 is provided on the surface of the phosphor cap 4 where the luminance is relatively high, that is, near the vertex of the phosphor cap 4, the focal point F1 and the reflection are reflected. The distance between the curved surface forming the inner surface 8b of the mirror 8 is increased, and the curvature of the curved surface forming the inner surface 8b of the focal point F1 and the reflecting mirror 8 is decreased, so that the size of the reflecting mirror 8 is increased. . Therefore, the lighting device cannot be made compact.

これに対して、本実施形態では、反射鏡８０の内側面８０ｂが、蛍光体キャップ４の表面上に焦点Ｆ２が位置する放物線Ｐａ２を前記光軸Ｍ１の周りに回転して形成される曲面８２ｂと、蛍光体キャップ４の表面上において焦点Ｆ２よりも蛍光体キャップ４の頂点の近くに焦点Ｆ３が位置する放物線Ｐａ３を前記光軸Ｍ１の周りに回転して形成される曲面８３ｂとから構成された形状に形成されていることにより、蛍光体キャップ４の表面上において輝度が比較的高い焦点Ｆ３に対応する位置から放射される光が、反射鏡８０によって前記光軸Ｍ１に平行な方向に反射され前記照射パターンの中央部に配光されるので、照射装置の正面光度を高めることができる。   On the other hand, in this embodiment, the inner surface 80b of the reflecting mirror 80 is formed by rotating a parabola Pa2 where the focal point F2 is located on the surface of the phosphor cap 4 around the optical axis M1. And a curved surface 83b formed by rotating a parabola Pa3 where the focal point F3 is located closer to the vertex of the phosphor cap 4 than the focal point F2 on the surface of the phosphor cap 4 around the optical axis M1. As a result, the light emitted from the position corresponding to the focal point F3 having a relatively high luminance on the surface of the phosphor cap 4 is reflected by the reflecting mirror 80 in a direction parallel to the optical axis M1. Since the light is distributed to the central portion of the irradiation pattern, the front luminous intensity of the irradiation device can be increased.

また、図２（ｂ）に示すように、実施形態１の照明装置に使用される反射鏡８に比べて、反射鏡８０の前記光軸Ｍ１方向における発光装置Ａとは反対側の端部８０ｄの開口径を小さくすることができるので、反射鏡８０全体のサイズの小型化を図れるから、照明装置のコンパクト化が図れる。   Further, as shown in FIG. 2B, the end 80d of the reflecting mirror 80 on the opposite side to the light emitting device A in the direction of the optical axis M1 as compared with the reflecting mirror 8 used in the illumination device of the first embodiment. Since the size of the entire reflecting mirror 80 can be reduced, the lighting device can be made more compact.

なお、本実施形態では、反射鏡８０の内側面８０ｂが、上述の曲面８２ｂと曲面８３ｂとから構成される例について説明したが、これに限定されるものではなく、例えば、図３に示すように、曲面８３ｂと、当該曲面８３ｂの蛍光体キャップ４側の端部から蛍光体キャップ４と基板２の前記一表面との接合部に向かって延設された傾斜面８４ｂとから構成されるものとしてもよい。   In the present embodiment, the example in which the inner side surface 80b of the reflecting mirror 80 is configured by the curved surface 82b and the curved surface 83b has been described. However, the present invention is not limited to this example. For example, as shown in FIG. And a curved surface 83b, and an inclined surface 84b extending from the end of the curved surface 83b on the phosphor cap 4 side toward the junction between the phosphor cap 4 and the one surface of the substrate 2. It is good.

なお、反射鏡８０の内側面８０ｂを構成する前記曲面を形成する放物線Ｐａ２，Ｐａ３の焦点Ｆ２、Ｆ３の位置は、蛍光体キャップ４の表面上に位置するものであれば、図２（ｂ）に示す位置に限定されない。また、本実施形態では、反射鏡８０の内側面８０ｂを構成する前記曲面を形成する放物線Ｐａ２，Ｐａ３の焦点Ｆ２，Ｆ３が蛍光体キャップ４の表面上に位置する例について説明したが、これに限定されるものではなく、焦点Ｆ２，Ｆ３が蛍光体キャップ４の内部に位置するようにしても本実施形態と同様の効果が得られる。   If the positions of the focal points F2 and F3 of the parabolas Pa2 and Pa3 that form the curved surface constituting the inner surface 80b of the reflecting mirror 80 are located on the surface of the phosphor cap 4, FIG. It is not limited to the position shown in. Further, in the present embodiment, the example in which the focal points F2 and F3 of the parabolas Pa2 and Pa3 forming the curved surface constituting the inner surface 80b of the reflecting mirror 80 are located on the surface of the phosphor cap 4 has been described. The present invention is not limited, and even if the focal points F2 and F3 are located inside the phosphor cap 4, the same effect as in the present embodiment can be obtained.

（実施形態３）
本実施形態の照明装置の基本構成は実施形態１とほぼ同じであり、図４に示すように、反射鏡８の内側面８ｂの形状が、前記放物線の焦点Ｆ１が蛍光体キャップ４の表面上に位置する単一の放物線を発光装置Ａの光軸Ｍ１の周りに回転して形成される曲面から構成されている。また、焦点Ｆ１が、蛍光体キャップ４の表面上に位置し、蛍光体キャップ４の表面上の焦点Ｆ１での接平面の法線が前記曲面と交差するように設定されている。 (Embodiment 3)
The basic configuration of the illumination device of the present embodiment is almost the same as that of the first embodiment. As shown in FIG. 4, the shape of the inner surface 8 b of the reflector 8 is such that the parabolic focus F1 is on the surface of the phosphor cap 4. Is formed from a curved surface formed by rotating a single parabola located around the optical axis M1 of the light emitting device A. The focal point F1 is positioned on the surface of the phosphor cap 4, and the normal line of the tangent plane at the focal point F1 on the surface of the phosphor cap 4 is set to intersect the curved surface.

本実施形態では、反射鏡８の内側面８ｂが焦点Ｆ１を有する単一の前記放物線より形成された前記曲面からなり、反射鏡８の前記光軸Ｍ１に平行な方向における基板２側とは反対側の端部８ｄに位置する前記曲面を構成する。また、前記曲面を形成する前記放物線の焦点Ｆ１が、焦点Ｆ１での接平面の前記法線が反射鏡８の前記端部８ｄに交差するように設定されている。なお、図４は、反射鏡８の内側面８ｂの形状と、蛍光体キャップ４の表面から放射して反射鏡８の内側面８ｂで反射される光の経路とについて、シミュレーションを行った結果を示す。図４において、縦軸は、発光装置Ａの光軸Ｍ１方向、横軸は光軸Ｍ１と直交する方向を表し、縦軸および横軸それぞれに記載した数値は、前記光軸Ｍ１と基板２の表面との交点から前記光軸Ｍ１方向および前記光軸Ｍ１と直交する方向への距離を表す。また、実施形態１の照明装置と同様の構成については同一の符号を付して説明を省略する。図４から、蛍光体キャップ４の表面上における焦点Ｆ１に対応する位置から蛍光体キャップ４の表面上の焦点Ｆ１での接平面の法線方向に放射した光が、反射鏡８に入射して反射鏡８によって前記光軸Ｍ１に平行な方向に反射されることが判る（図４参照）。   In the present embodiment, the inner surface 8b of the reflecting mirror 8 is composed of the curved surface formed by the single parabola having the focal point F1, and is opposite to the substrate 2 side in the direction parallel to the optical axis M1 of the reflecting mirror 8. The curved surface located at the side end 8d is formed. Further, the focal point F1 of the parabola that forms the curved surface is set so that the normal line of the tangent plane at the focal point F1 intersects the end 8d of the reflecting mirror 8. FIG. 4 shows the result of simulation of the shape of the inner side surface 8b of the reflecting mirror 8 and the path of light radiated from the surface of the phosphor cap 4 and reflected by the inner side surface 8b of the reflecting mirror 8. Show. In FIG. 4, the vertical axis represents the direction of the optical axis M1 of the light emitting device A, the horizontal axis represents the direction orthogonal to the optical axis M1, and the numerical values described on the vertical axis and the horizontal axis represent the optical axis M1 and the substrate 2 respectively. It represents the distance from the intersection with the surface to the direction of the optical axis M1 and the direction orthogonal to the optical axis M1. Moreover, about the structure similar to the illuminating device of Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted. From FIG. 4, the light emitted in the normal direction of the tangential plane at the focal point F1 on the surface of the phosphor cap 4 from the position corresponding to the focal point F1 on the surface of the phosphor cap 4 is incident on the reflecting mirror 8. It can be seen that the light is reflected by the reflecting mirror 8 in a direction parallel to the optical axis M1 (see FIG. 4).

ところで、蛍光体キャップ４の表面の輝度分布は、ＬＥＤチップ１から放射され蛍光体キャップ４の内面に入射する青色光の光度に依存する。発光装置Ａでは、ＬＥＤチップ１が凸レンズ状の光学部材３で封止されているので、蛍光体キャップ４の内面に入射する青色光の光度は、蛍光体キャップ４と基板２との接合部から蛍光体キャップ４の頂点に向かうほど高くなっている。従って、蛍光体キャップ４の表面の輝度は、蛍光体キャップ４と基板２との接合部近傍から蛍光体キャップ４の頂点に向かうほど高くなるように分布している。従って、照明装置の正面光度を高めるためには、図５に示すように、焦点Ｆ１の位置を蛍光体キャップ４の頂点に設定することが考えられる。図５に示す構成の照明装置では、蛍光体キャップ４の表面上における焦点Ｆ１に対応する位置から放射される光のうち、放射方向と蛍光体キャップ４の表面上の焦点Ｆ１での接平面の法線方向とのなす角度が比較的大きい光のみが反射鏡８の内側面８ｂに入射することとなる（図５の矢印Ｄ５１）。   By the way, the luminance distribution on the surface of the phosphor cap 4 depends on the luminous intensity of the blue light emitted from the LED chip 1 and incident on the inner surface of the phosphor cap 4. In the light emitting device A, since the LED chip 1 is sealed by the convex lens-shaped optical member 3, the luminous intensity of the blue light incident on the inner surface of the phosphor cap 4 is determined from the junction between the phosphor cap 4 and the substrate 2. The height increases toward the top of the phosphor cap 4. Therefore, the brightness of the surface of the phosphor cap 4 is distributed so as to increase from the vicinity of the junction between the phosphor cap 4 and the substrate 2 toward the vertex of the phosphor cap 4. Therefore, in order to increase the front luminous intensity of the illuminating device, it is conceivable to set the position of the focal point F1 at the apex of the phosphor cap 4 as shown in FIG. In the illuminating device having the configuration shown in FIG. 5, of the light emitted from the position corresponding to the focal point F <b> 1 on the surface of the phosphor cap 4, the radiation direction and the tangential plane at the focal point F <b> 1 on the surface of the phosphor cap 4 are obtained. Only light having a relatively large angle with the normal direction enters the inner surface 8b of the reflecting mirror 8 (arrow D51 in FIG. 5).

しかしながら、発光装置Ａにおいて、蛍光体キャップ４の表面上における焦点Ｆ１に対応する位置から放射される光のうち、放射方向と蛍光体キャップ４の表面上の焦点Ｆ１での接平面の法線方向とのなす角度が大きい光ほど、黄色光の比率が高いことから、図５に示す照明装置では、前記照射パターンの中央部に配光される光の黄色光の比率が前記照射パターンの周辺部に配光される光の黄色光の比率に比べて上昇し、前記照射パターンに色むらが生じるおそれがあった。   However, in the light emitting device A, out of the light emitted from the position corresponding to the focal point F1 on the surface of the phosphor cap 4, the radiation direction and the normal direction of the tangential plane at the focal point F1 on the surface of the phosphor cap 4 5 has a higher ratio of yellow light, so in the illumination device shown in FIG. 5, the ratio of yellow light distributed to the central portion of the irradiation pattern is the peripheral portion of the irradiation pattern. As compared with the ratio of yellow light to the light distributed to the light, there is a possibility that color unevenness occurs in the irradiation pattern.

また、図５に示す照明装置では、反射鏡８の内側面８ｂにおける蛍光体キャップ４と基板２との接合部近傍には、蛍光体キャップ４の頂点から放射した光が入射せず（図５の矢印Ｄ６１）、反射鏡８によって前記照射パターンの中央部に配光される光が減少し、照明装置の正面光度の低下を生ずるおそれもある。   In the illumination device shown in FIG. 5, the light emitted from the apex of the phosphor cap 4 does not enter the vicinity of the junction between the phosphor cap 4 and the substrate 2 on the inner surface 8b of the reflecting mirror 8 (FIG. 5). Arrow D61), the light distributed to the central portion of the irradiation pattern by the reflecting mirror 8 is reduced, and there is a possibility that the front luminance of the illumination device is lowered.

これに対して、本実施形態の照明装置では、図４に示すように、反射鏡８によって、蛍光体キャップ４の表面上における焦点Ｆ１に対応する位置から蛍光体キャップ４の表面上の焦点Ｆ１での接平面の法線方向に放射される青色光の比率の高い光が、前記光軸Ｍ１に平行な方向に反射されることにより、前記照射パターンの中央部に配光される光の黄色光の比率が上昇するのを抑制することができる。従って、前記照射パターンにおいて、中央部と周辺部との間で生じるＬＥＤチップ１から放射される青色光と蛍光体キャップ４から放射される黄色光との比率の差異を低減することができるので、前記照射パターンに生じる色むらを軽減することができる。また、蛍光体キャップ４の表面から放射される光に対する反射鏡８の内側面８ｂに入射する光の比率を高めることにより、焦点Ｆ１から放射した光が反射鏡８により前記光軸Ｍ１に平行な方向に反射される効率を上昇させることができるので、照明装置の正面光度を高めることができる。   On the other hand, in the illuminating device of this embodiment, as shown in FIG. 4, the focal point F1 on the surface of the phosphor cap 4 from the position corresponding to the focal point F1 on the surface of the phosphor cap 4 by the reflecting mirror 8. The light with a high ratio of blue light emitted in the normal direction of the tangent plane at is reflected in the direction parallel to the optical axis M1, so that the yellow color of the light distributed to the central portion of the irradiation pattern An increase in the ratio of light can be suppressed. Therefore, in the irradiation pattern, it is possible to reduce the difference in the ratio between the blue light emitted from the LED chip 1 and the yellow light emitted from the phosphor cap 4 that occurs between the central portion and the peripheral portion. Color unevenness occurring in the irradiation pattern can be reduced. Further, by increasing the ratio of the light incident on the inner surface 8b of the reflecting mirror 8 to the light emitted from the surface of the phosphor cap 4, the light emitted from the focal point F1 is parallel to the optical axis M1 by the reflecting mirror 8. Since the efficiency reflected in the direction can be increased, the front luminous intensity of the lighting device can be increased.

また、本実施形態では、反射鏡８の内側面８ｂが焦点Ｆ１を有する単一の前記放物線より形成された前記曲面からなり、反射鏡８の前記光軸Ｍ１方向における基板２側とは反対側の端部８ｄに位置する前記曲面を構成する。また、前記曲面を形成する前記放物線の焦点Ｆ１が、焦点Ｆ１での接平面の前記法線が反射鏡８の前記端部８ｄに交差するように設定されている。   Further, in the present embodiment, the inner surface 8b of the reflecting mirror 8 is composed of the curved surface formed by the single parabola having the focal point F1, and is opposite to the substrate 2 side in the optical axis M1 direction of the reflecting mirror 8. The curved surface located at the end portion 8d of the first is formed. Further, the focal point F1 of the parabola that forms the curved surface is set so that the normal line of the tangent plane at the focal point F1 intersects the end 8d of the reflecting mirror 8.

従って、反射板８の内側面８ｂが、焦点Ｆ１に対応する蛍光体キャップ４の表面における比較的輝度が高い位置から、蛍光体キャップ４の表面上の焦点Ｆ１での接平面の法線方向に放射される光が、前記照射パターンの中央部に配光されるので、前記照射パターンに生じる色むらを軽減することができるとともに照明装置の正面光度を高めることができる。   Accordingly, the inner surface 8b of the reflector 8 is in the normal direction of the tangential plane at the focal point F1 on the surface of the phosphor cap 4 from the position where the luminance is relatively high on the surface of the phosphor cap 4 corresponding to the focal point F1. Since the emitted light is distributed to the central portion of the irradiation pattern, uneven color generated in the irradiation pattern can be reduced and the front luminance of the illumination device can be increased.

なお、反射鏡８の内側面８ｂを構成する前記曲面を形成する前記放物線の焦点Ｆ１の位置は、蛍光体キャップ４の表面上に位置するものであれば、図４に示す位置に限定されない。また、本実施形態では、反射鏡８の内側面８ｂを構成する前記曲面を形成する前記放物線の焦点Ｆ１が蛍光体キャップ４の表面上に位置する例について説明したが、これに限定されるものではなく、焦点Ｆ１が蛍光体キャップ４の内部における蛍光体キャップ４の表面に沿った仮想曲面上に位置するようにし、前記曲面に、前記仮想曲面上に位置する焦点Ｆ１での接平面の法線が交差するように設定しても本実施形態と同様の効果が得られる。   The position of the focal point F1 of the parabola that forms the curved surface constituting the inner surface 8b of the reflecting mirror 8 is not limited to the position shown in FIG. 4 as long as it is located on the surface of the phosphor cap 4. Moreover, although this embodiment demonstrated the example in which the focus F1 of the said parabola which forms the said curved surface which comprises the inner surface 8b of the reflective mirror 8 was located on the surface of the fluorescent substance cap 4, it is limited to this Instead, the focal point F1 is located on a virtual curved surface along the surface of the phosphor cap 4 inside the phosphor cap 4, and the tangent plane method at the focal point F1 located on the virtual curved surface is formed on the curved surface. Even if the lines are set to intersect, the same effect as in the present embodiment can be obtained.

実施形態１の照明装置を示し、（ａ）は概略断面図、（ｂ）は概略説明図である。The illuminating device of Embodiment 1 is shown, (a) is a schematic sectional drawing, (b) is a schematic explanatory drawing. 実施形態２の照明装置の概略説明図である。It is a schematic explanatory drawing of the illuminating device of Embodiment 2. FIG. 同上の他の実施例の概略説明図である。It is a schematic explanatory drawing of the other Example same as the above. 実施形態３の照明装置の概略説明図である。It is a schematic explanatory drawing of the illuminating device of Embodiment 3. 同上の概略説明図である。It is a schematic explanatory drawing same as the above. 従来例の概略断面図である。It is a schematic sectional drawing of a prior art example. 同上の発光装置の概略断面図である。It is a schematic sectional drawing of a light-emitting device same as the above.

符号の説明Explanation of symbols

１ ＬＥＤチップ（発光素子）
２ 基板
４ 蛍光体キャップ（色変換部材）
８ 反射鏡
８ｂ 内側面
８ｄ 端部
８０ 反射鏡
８０ｂ 内側面
８２ｂ，８３ｂ 曲面
Ａ 発光装置
Ｍ１ 光軸
Ｆ１，Ｆ２，Ｆ３ 焦点 1 LED chip (light emitting device)
2 Substrate 4 Phosphor cap (color conversion member)
8 Reflecting mirror 8b Inner side surface 8d End 80 Reflecting mirror 80b Inner side surfaces 82b, 83b Curved surface A Light emitting device M1 Optical axes F1, F2, F3 Focus

Claims (4)

発光素子と当該発光素子が一表面側に実装された基板と発光素子から放射される光によって励起され当該光の色とは異なる色の光を放射する蛍光体を含有した透光性材料により表面が曲面状のドーム状に形成された色変換部材とを有する発光装置と、基板の前記一表面側において色変換部材を囲む形で配設され発光装置から放射される光の配光を制御する反射鏡とを備え、色変換部材は、発光素子を基板との間に囲む形で基板の前記一表面側に配設されてなり、反射鏡は、内側面の形状が、色変換部材の表面および内部のいずれかにおける前記発光装置の光軸から前記光軸とは直交する方向に離間した位置に焦点が位置する少なくとも１つの放物線を前記光軸の周りに回転して形成される曲面から構成されてなることを特徴とする照明装置。   A surface made of a light-emitting element, a substrate on which the light-emitting element is mounted on one surface, and a translucent material containing a phosphor that emits light of a color different from the color of the light that is excited by light emitted from the light-emitting element A light emitting device having a color conversion member formed in a curved dome shape and a light distribution device disposed on the one surface side of the substrate so as to surround the color conversion member and controlling light distribution from the light emitting device The color conversion member is disposed on the one surface side of the substrate so as to surround the light emitting element with the substrate, and the reflection mirror has an inner surface shape that is the surface of the color conversion member. And a curved surface formed by rotating at least one parabola whose focal point is located at a position separated from the optical axis of the light-emitting device in a direction orthogonal to the optical axis at any one of the inside and around the optical axis. A lighting device characterized by being made. 前記反射鏡は、前記内側面の形状が、前記色変換部材の前記表面および前記内部のいずれかにおける前記光軸から前記光軸とは直交する方向に離間した位置に前記焦点が位置する複数の前記放物線を前記光軸の周りに回転して形成される複数の前記曲面から構成されてなり、且つ、前記内側面における前記色変換部材の表面から離れた部位を構成する前記曲面ほど前記放物線の前記焦点が前記色変換部材の頂点の近くに位置するように形成されてなることを特徴とする請求項１記載の照明装置。   The reflecting mirror has a plurality of focal points in which the shape of the inner surface is spaced from the optical axis in a direction orthogonal to the optical axis on either the surface or the interior of the color conversion member. The parabola is formed by a plurality of the curved surfaces formed by rotating the parabola around the optical axis, and the curved surface constituting the portion away from the surface of the color conversion member on the inner side surface. The lighting device according to claim 1, wherein the focal point is formed so as to be positioned near a vertex of the color conversion member. 前記焦点は、前記色変換部材の前記表面上と前記色変換部材の前記内部における前記色変換部材の表面に沿った仮想曲面上とのいずれかに位置し、前記色変換部材の前記表面上と前記仮想曲面上とのいずれかの前記焦点での接平面の法線が前記曲面と交差するように設定されてなることを特徴とする請求項１または請求項２記載の照明装置。   The focal point is located on either the surface of the color conversion member or a virtual curved surface along the surface of the color conversion member inside the color conversion member, and on the surface of the color conversion member. The lighting device according to claim 1, wherein a normal line of a tangent plane at the focal point on the virtual curved surface is set to intersect the curved surface. 前記反射鏡の前記光軸に平行な方向における前記基板側とは反対側の端部に位置する前記曲面を形成する前記放物線の前記焦点は、前記焦点での接平面の前記法線が前記反射鏡の前記端部に交差するように設定されてなることを特徴とする請求項３記載の照明装置。   The focal point of the parabola that forms the curved surface located at the end opposite to the substrate side in the direction parallel to the optical axis of the reflecting mirror is the normal of the tangential plane at the focal point is the reflection. The lighting device according to claim 3, wherein the lighting device is set so as to intersect the end of the mirror.
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