JP2009099470A - Illumination device - Google Patents

Illumination device Download PDF

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JP2009099470A
JP2009099470A JP2007271688A JP2007271688A JP2009099470A JP 2009099470 A JP2009099470 A JP 2009099470A JP 2007271688 A JP2007271688 A JP 2007271688A JP 2007271688 A JP2007271688 A JP 2007271688A JP 2009099470 A JP2009099470 A JP 2009099470A
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light
heat transfer
transfer member
optical axis
surface
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JP5097916B2 (en )
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Kenji Yoneda
賢治 米田
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Ccs Inc
シーシーエス株式会社
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2107/00Light sources with three-dimensionally disposed light-generating elements
    • F21Y2107/90Light sources with three-dimensionally disposed light-generating elements on two opposite sides of supports or substrates
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device that can dissipate heat of an LED device efficiently, and achieve a large amount of light by collecting outgoing light of the LED device without loss thereof.
SOLUTION: The illumination device comprises: a reflective part 1 having a reflective surface 11a that is shaped in a paraboloid of revolution; a substrate 2 that is a tabular heat transfer member having a plane in which a center axis Z of rotation of the reflective surface 11a is included; and an LED device 3 supported by the substrate 2 in or near a focus position of the paraboloid of revolution in such a condition that an outgoing optical axis 3x is orthogonal to the center axis Z of rotation, wherein a lateral end 2y of the substrate 2 is connected with a reflective part body 11 and a fin-support section 122.
COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、LED素子の熱を効率的に放熱でき、該LED素子の出射する光をロス無く集光して大光量を得られる照明装置に関するものである。 The present invention, heat of the LED element can efficiently radiate, to a lighting device obtained without loss condensed by large amount of light emitted light of the LED element.

従来、複数のLED素子が出射する光を反射・集光して大光量を得られるようにした照明装置が知られている。 Conventionally, the illumination apparatus is known in which a plurality of LED elements is to obtain a large amount of light reflected and condenses the light emitted.

具体的にこの種の照明装置は、楕円曲面の一方の焦点に配設され、外方向に光をそれぞれ出射するようにした複数のLED素子と、これらLED素子を環状を成すように支持する略円筒形状の基板と、前記楕円曲面を前記基板の中心軸回りに360度回転することで得られる反射面とを具備し、各LED素子が出射する光の一部(光軸を中心とした所定範囲の立体角に含まれる光)を、前記反射面で確実に反射し、その反射光がLED素子自身や基板により遮られることなく、照射目的点である前記他方の焦点に集束して大光量を得られるように構成されている(例えば、特許文献1参照)。 Substantially specifically lighting apparatus of this type, is disposed on one focal point of the elliptic surface, a plurality of LED elements so as to emit light respectively outwardly, the LED elements are supported so as to form a cyclic a substrate of a cylindrical shape, a predetermined said elliptic surface; and a reflection surface obtained by rotating 360 degrees around the central axis of the substrate, each of the LED elements is centered portion of the light (the optical axis of emitted range of light) included in the solid angle, said reliably reflected by the reflecting surface without the reflected light is blocked by the LED element itself and the substrate, and focused on the other focal point is irradiated object point large amount of light is configured to obtain (for example, see Patent Document 1).
特開2003−4641号公報 JP 2003-4641 JP

ところがこのような従来の構成では、複数のLED素子は、それぞれ異なる楕円曲面の一方の焦点に配されているため、各LED素子が出射する光のうち、一部の光しか照射目的点に集束できず、大光量を得られない。 However, in such a conventional configuration, the plurality of LED elements, because they are placed at one focus of the different elliptic surface, of the light the LED elements is emitted, only a part of the light focused on the irradiation target point can not, it can not be obtained a large amount of light. また、LED素子が発する熱を効率よく放熱することに関して、なんらかの特別な工夫が行われているといったものでもない。 With respect to the heat radiation efficiently heat the LED elements emitted, some special contrivance is not intended, such being performed.

本発明は、このような課題に着目してなされたものであって、主たる目的は、LED素子の熱を効率的に放熱でき、該LED素子の出射する光をロス無く集光して大光量を得られる照明装置を提供することにある。 The present invention was made in view of such problems, a main object is, the heat of the LED element can efficiently radiate a large amount of light the light emission of the LED elements and without loss condensed to provide an illumination device obtained by.

すなわち本発明にかかる照明装置は、装置全体の照射光軸を含む面内に配される平板状の伝熱部材と、前記面と直交する断面の形状が放物線形状又は楕円形状の反射面を有する反射部と、素子の出射光軸が前記照射光軸と直交する状態で、前記放物線の焦点位置若しくはその近傍又は前記楕円の一方の焦点位置若しくはその近傍にて前記伝熱部材に支持されるLED素子とを具備し、前記伝熱部材の側端部を、前記反射面に接続していることを特徴とする。 That lighting device according to the invention has a flat heat transfer member that is disposed in a plane including the irradiation optical axis of the entire apparatus, the shape of the cross section perpendicular to the plane of the reflecting surface of the parabolic or elliptical shape a reflection portion, LED is supported by the heat transfer member in a state in which the emission light axis is perpendicular to the irradiation optical axis, at one of the focal position or its vicinity of the focal position or its vicinity or the oval of the parabola of the device comprising the element, the side end portion of the heat transfer member, characterized in that it is connected to the reflecting surface.

ここで、「平板状」とは、必ずしも「板」である必要はなく、例えば、平らに張られた膜状のものも含む概念である。 Here, "flat" is not necessarily "plate", for example, is a concept including those stretched on a flat film form.

このようなものであれば、LED素子の熱は、伝熱部材の側端部全体から反射面に伝達されて反射部で放熱されるため、高い放熱効果を得られる。 In accordance with this arrangement, the heat of the LED element are dissipated by the reflection portion is transmitted to the reflecting surface from the entire side edge of the heat transfer member, obtain a high heat dissipation effect. このとき、伝熱部材は平板状であるため、熱は厚み方向よりも面方向に伝熱しやすいといった熱の性質を有効に利用して、LED素子から伝熱部材に伝わった熱を、その面方向に速やかに伝わらせ、例えば放熱フィンで放熱することができ、より高い放熱効果を得られる。 At this time, since the heat transfer member is a flat plate, the heat is effectively utilized thermal properties such as heat heated easily in a plane direction than the thickness direction, the heat transferred to the heat transfer member from the LED element, the surface was transmitted to promptly direction, it can be dissipated in for example heat dissipating fins, resulting in higher heat dissipation effect. また、LED素子を、その出射光軸が装置全体の照射光軸と直交する状態で、前記放物線の焦点位置若しくはその近傍又は前記楕円の一方の焦点位置若しくはその近傍にて前記伝熱部材に支持されるようにしているため、LED素子が前記反射面の放物線部分又は楕円部分に向けて出射する全ての光(反射面で反射された光を含む。以下同様)は、伝熱部材によって遮られることはない。 Further, an LED element, with its emission optical axis is orthogonal to the irradiation optical axis of the entire device, the heat transfer member at one of the focal position or its vicinity of the focal position or its vicinity or the oval of the parabola support because it to be, (. Similarly including light reflected by the reflecting surface) all light LED elements is emitted toward the parabolic portion or elliptical portion of the reflecting surface is blocked by the heat transfer member it is not. しかして、反射面が放物線形状である場合にはLED素子が出射する全ての光を効率よく平行光として照射することができ、反射面が楕円形状である場合には、LED素子が出射する殆ど全ての光を、該楕円の他方の焦点に集光することができる。 Thus, when the reflecting surface is parabolic shape can be irradiated all light LED element is emitted as efficiently parallel light, when the reflection surface is oval-shaped, almost LED element is emitted all the light can be focused on the other focus of the ellipse.

すなわち、LED素子の熱を効率的に放熱しながら該LED素子の出射する光をロス無く集光して大光量を得られる照明装置を提供することができる。 That is, it is possible to light emitted in the LED element while radiating the heat of the LED element efficiently and without loss condensed to provide a lighting device obtained a large amount of light.

前記反射面が、回転放物面形状又は回転楕円面形状であれば、比較的容易に反射面の設計を行うことができる。 It said reflecting surface, if the paraboloid shape or spheroidal shape, can be performed relatively easily reflecting surface design.

シンプルな構成でありながら、大きな光量を取り出せるようにするには、前記伝熱部材の表面及び裏面で、前記LED素子をそれぞれ支持していることが好ましい。 Yet simple construction, to be taken out a large amount of light, the surface and the back surface of the heat transfer member, it is preferable that supports the LED element, respectively.

前記伝熱部材が、前記LED素子の電極を兼ねているのであれば、この伝熱部材を、例えばガラスエポキシ樹脂及び銅を用いて構成できるなど、比較的安価なものとすることができる。 It said heat transfer member, if also serves as an electrode of the LED element, the heat transfer member, for example, can be constructed using a glass epoxy resin and copper, can be made relatively inexpensive.

本発明の望ましい態様としては、前記反射部は、前記反射面で反射させた光を外部へ導出する開口を有し、前記側端部は、前記伝熱部材の前記開口に臨む端部以外の全ての端部であるものが挙げられる。 Desirable embodiments of the present invention, the reflective portion has an opening for deriving the light reflected by the reflecting surface to the outside, the side end portions, other than the end portion facing the opening of the heat transfer member include those that are all end.

より効率的な放熱効果を得るには、前記反射部が、内部に前記反射面を形成した反射部本体と、この反射部本体に連続して設けた放熱フィンとを具備していることが好ましい。 To obtain a more efficient heat dissipation effect, the reflective portion, it is preferable that includes a reflection portion main body formed with the reflecting surface therein and a radiating fin provided continuously to the reflector body .

本発明の望ましい態様としては、光導入端を前記楕円面の他方の焦点に臨ませたライトガイドを具備しているものが挙げられる。 Desirable embodiments of the present invention, those light introduction end comprising the ellipsoidal other light guides to face the focal point of the like. ここで、「ライトガイド」の具体的な態様としては、例えば、光ファイバ、光ファイバを接続可能なロッドレンズ、フレネルレンズ等の集光レンズ等が挙げられる。 Here, as a specific embodiment of the "light guide", for example, an optical fiber, it can be connected rod lens optical fibers, a condenser lens such as a Fresnel lens and the like. 例えば前記光導出端に、光ファイバを直接接続又はロッドレンズを介して間接的に接続すれば、光ファイバを利用した大光量による製品検査を好適に行うことができる。 For example, the light outlet end, if indirectly connected via a direct connection or a rod lens of the optical fiber can be suitably carried out product inspection by a large amount of light using an optical fiber.

伝熱部材の各面にそれぞれ単一のLED素子のみを搭載すると、その出射光軸方向の光が強くなって、縦長の光となる場合がある。 As each on each side of the heat transfer member is mounted only a single LED element, that with emission light axis direction of the light becomes stronger, it may become elongated light. この現象を緩和して、より円形に近いムラのない光を照射するためには、前記伝熱部材の表裏各面において、複数のLED素子を互いの出射光軸の向きを異ならせて集合配置しているものが望ましい。 This phenomenon was alleviated, and more for irradiating light without close uneven circle, the front and back surfaces of the heat transfer member, collectively arranged plurality of LED elements with different orientation of the mutual exit optical axis those that are desirable.

より具体的には、前記複数のLED素子を、ブロック体上に配置し、そのブロック体を前記伝熱部材に支持させればよい。 More specifically, the plurality of LED elements, arranged on the block body, it is sufficient to support the block body to the heat transfer member. このような構造であれば、ブロック体にLED素子を調整配置した後、ブロック体を伝熱部材に搭載するなどの方法により、簡単に製造することができるようになる。 With such a structure, after the LED element was adjusted arranged in a block body, by a method of mounting the block body to the heat transfer member, it is possible to easily manufacture.

ところで、LED素子3の配置位置に誤差があったり、LED素子3が点光源とはみなせないようなものであったりすると、反射面が放物線形状のときには、LED素子が出射する全ての光を、開口で平行光として照射することができず、また、反射面が楕円形状のときには、その全ての光を、該楕円の他方の焦点に集光することができない。 Incidentally, or there is an error in the position of the LED elements 3, the LED element 3 or be such as not be regarded in a point light source, when the reflecting surface of the parabolic shape, all light LED element is emitted, opening can not be irradiated as parallel light in, the reflecting surface is at the elliptical shape, the all light can not be focused on the other focus of the ellipse. そこで、光導入端を、前記反射面で反射させた光を外部へ導出する前記反射部の開口に望ませたライトガイドを具備し、前記反射部の開口径と前記光導入端の径とを略等しくする構成を採ることにより、その開口に望ませ且つその開口径と略等しい径の光導入端を有するライトガイドによって、LED素子が出射する全ての光を利用することができる。 Therefore, the light introduction end, said comprising the reflective portion light guide which has desired opening of deriving the light reflected by the reflecting surface to the outside, and a diameter of an opening diameter and the light introduction end of the reflective portion by taking a substantially equal configuration, it is possible by the light guide having a light introducing end of substantially equal diameter as and its opening diameter was desirable in the opening, utilizing all light LED element is emitted.

本発明の車両用ヘッドライトの望ましい態様としては、装置全体の照射光軸を含む面内に配される平板状の伝熱部材と、前記面と直交する断面の輪郭形状が放物線形状の反射面を有する反射部と、素子の出射光軸が前記照射光軸と直交する状態で、前記放物線の焦点位置若しくはその近傍にて前記伝熱部材に支持されるLED素子とを具備し、前記伝熱部材の側端部を、前記反射面に接続しているものが挙げられる。 The preferred embodiment of the vehicle headlight of the present invention, a planar heat transfer member that is disposed in a plane including the irradiation optical axis of the entire device, the reflective surface contour of the cross section perpendicular to the surface parabolic a reflecting portion having, in a state where the emission optical axis of the element is perpendicular to the irradiation optical axis, comprising an LED element which is supported by the heat transfer member at the focal position or the vicinity thereof of the parabola, the heat transfer the side end portion of the member include those that are connected to the reflecting surface.

このように本発明に係る照明装置は、LED素子が発する熱の高い放熱効果と、照射目的点で大光量を得ることとを同時に実現できる照明装置を提供することができる。 Thus the lighting apparatus according to the present invention can provide a high heat dissipation effect of the heat from the LED element emits the illumination device capable of realizing a to obtain a large amount of light at the irradiation target point at the same time.

以下に本発明の一実施形態について図面を参照して説明する。 Will be described with reference to the accompanying drawings, an embodiment of the present invention are described below.

本実施形態に係る照明装置Aは、例えば車両用ヘッドライトとして使用されるものであって、図1、図2、図3、図4に示すように、内部に回転放物面形状の反射面11aを有する反射部1と、この反射部1の内部に配設した伝熱部材である基板2と、この基板2の表面及び裏面のそれぞれの焦点位置又はその近傍に配設したLED素子3と、を具備するものである。 Lighting device A according to this embodiment, for example, be one that is used as a headlight for a vehicle, Fig. 1, 2, 3, as shown in FIG. 4, the reflecting surface of a paraboloid of revolution therein a reflection portion 1 with 11a, the substrate 2 is a heat transfer member which is disposed inside the reflecting portion 1, and the LED element 3 is disposed in each of the focal position or near the front and back surfaces of the substrate 2 , it is intended to include a. 以下、各部を具体的に説明する。 It will be specifically described below each section.

反射部1は、金属製のものであって、外観視略円柱形状で内部に前記反射面11aを形成した反射部本体11と、この反射部本体11の基端側に連続して設けた放熱部12とを具備している。 Reflecting portion 1 is intended for metal, the reflection body 11 which forms the reflective surface 11a inside appearance view substantially cylindrical shape and provided continuously to the proximal end side of the reflecting body 11 radiating It has and a part 12.

反射部本体11は、図3、図4に示す軸Zを装置全体の照射光軸である回転中心軸とし且つ後述する2つのLED素子3を配設する共通の位置を焦点S1とする回転放物面(すなわち、軸Zを含めて切った任意の断面の形状が放物面形状を有している。)で構成された反射面11aを有するものであって、該反射面11aで反射させた光を、正面視略円形状の開口11zから外部へ導出できるようにしている。 Reflecting body 11, FIG. 3, the rotation release a focal S1 is common positions to arrange the two LED elements 3 axes Z of the rotational center axis illumination is the optical axis of the entire device and later shown in FIG. 4 the object plane (i.e., the shape of any cross-section taken including the axis Z has a parabolic shape.) be one having a reflecting surface 11a which is composed of, it is reflected by the reflecting surface 11a the light, so that can be derived from the front view substantially circular opening 11z externally.

放熱部12は、略円板状の複数の放熱フィンfと、これら各放熱フィンfを所定間隔離間させながらそれぞれの中心部分を支持する略平板状のフィン支持部122とを備えるものである。 Radiating unit 12 is provided with a plurality of heat dissipating fins f of substantially disk-shaped, and a substantially flat fin support 122 which supports the respective central portion while spaced a predetermined each of these radiating fins f interval.

なお、本実施形態では、この反射部1を、基板2の取り付け等のために、照射方向と直交する方向に二分割できるようにしている。 In the present embodiment, the reflection portion 1, for such attachment of the substrate 2, are to be divided into two parts in a direction perpendicular to the irradiation direction.

基板2は、平面視略矩形状をなすものであって、反射部本体11の開口11zに臨む端部2xを、その開口11zから内側へオフセットさせるとともに、前記端部2x以外の全ての端部である側端部2yを、反射部本体11及びフィン支持部122に接続している。 Substrate 2, there is forming a generally rectangular plan view shape, an end portion 2x facing the opening 11z of the reflecting body 11, causes offset from the opening 11z inward, all ends except the end portion 2x the side edge portion 2y is, connected to the reflector body 11 and the fin support 122. より具体的には、側端部2yが、当該装置の組立後に、反射部本体11及びフィン支持部122のそれぞれに挟まれた状態となるようにしている(図7参照)。 More specifically, the side end portion 2y is, after assembly of the device, so that a state sandwiched between the respective reflected portion main body 11 and the fin support 122 (see FIG. 7). このように、基板2の側端部2yを反射部本体11及びフィン支持部122が押さえるため、基板2を可及的に薄くしても、LED素子3を好適に支持することができる。 Thus, for pressing the side edge portion 2y of the substrate 2 is reflected portion body 11 and the fin support 122, even by reducing the substrate 2 as much as possible, the LED element 3 can be suitably supported.

そして、本実施形態では、この基板2を、図5、図6、図7などに示すように、配線パターン22を表面に設けた2つの基板本体21を備えるものとし、その裏面同士を貼り合せて形成している。 The combined in the present embodiment, the substrate 2, 5, 6, as shown in FIG. 7 and the like, and those having two substrate body 21 having a wiring pattern 22 on the surface, bonding the back surface to each other It is formed Te.

基板本体21は、ガラスエポキシ製で板状のものである。 Substrate main body 21 is of plate-like made of glass epoxy.

配線パターン22は銅箔からなる比較的厚肉のもので、本実施形態では、正極の配線パターン22a及び負極の配線パターン22bを有している。 The wiring pattern 22 of a relatively thick made of copper foil, in the present embodiment has a positive electrode of the wiring patterns 22a and the negative electrode of the wiring pattern 22b.

LED素子3は、例えば200mA以上の電流を流すことが可能ないわゆるパワーLEDと称される面実装タイプのものであり、図3、図4、図5に示すように、出射光軸3xが前記回転中心軸Zと直交する状態で、前記回転放物面の焦点S1位置にて基板2に支持されるようにしている。 LED element 3 is, for example, those of the called SMD type with so-called power LED that can flow more current 200 mA, 3, 4, as shown in FIG. 5, the emission optical axis 3x said a state perpendicular to the rotation axis Z, so that is supported by the substrate 2 at the focal S1 position of the paraboloid. そして、本実施形態では、N層を負極の配線パターン22bに載置する一方、P層と正極の配線パターン22aとをワイヤWによって接続している。 In the present embodiment, while placing the N layer to the negative electrode of the wiring pattern 22b, and the wiring pattern 22a of the P layer and the positive electrode was connected by wire W.

以上のように構成される車両用ヘッドライトについて、その動作の一例を以下に述べる。 A vehicle headlight having the above is described an example of the operation below.

各LED素子3に電力を供給すると、各LED素子3はそれぞれ光を出射する。 Supplying power to each LED element 3, each LED element 3 emits light, respectively. ここで、各LED素子3は、それぞれの出射光軸3xが前記回転中心軸Zと直交する状態で、回転放物面の焦点S1位置にて基板2に支持されるようにしているため、LED素子3が出射する全ての光は、回転放物面形状を有する反射面11aで反射され、基板2によって遮られること無く、図8に示すように平行光となって反射部1の開口11zから外方に向けて照射される。 Here, each LED element 3, since each of the outgoing optical axis 3x so that the state that is perpendicular to the rotation axis Z, is supported on the substrate 2 at the focal S1 position of the rotation paraboloid, LED all light element 3 is emitted is reflected by the reflecting surface 11a having a parabolic shape, without being blocked by the substrate 2, the opening 11z of the reflection portion 1 becomes parallel light as shown in FIG. 8 It is radiated outward. なお、図8では図面が煩雑になるのを避けるため代表的な光路のみを記載しているが、記載した光路以外にも多数の光路が有ることは当然である。 Although described only typical optical path to avoid drawing in FIG. 8 becomes complicated, it will be appreciated that multiple optical path other than an optical path as described there. また、LED素子3なども図示することを適宜省略している。 Moreover, it is omitted as appropriate that an LED element 3 is also shown.

また、LED素子3で発生する熱は、基板2の面方向に急速に広がって、側端部2yに伝熱される。 Further, heat generated by the LED element 3 is rapidly spreading in the plane direction of the substrate 2, the heat is transferred to the side edge portion 2y. この側端部2yは、反射部本体11及びフィン支持部122に接続されているため、該側端部2yに伝わった熱は、その反射部本体11及びフィン支持部122を経て、放熱フィンfへとさらに伝達される。 The side edge portion 2y is because it is connected to the reflector body 11 and the fin support 122, heat transferred to the side end portion 2y is through the reflective body 11 and the fin support 122, the heat radiating fins f further transmitted to. しかしてLED素子3で発生する熱は、放熱フィンfなどでも放熱されるため、高い放熱効果を得られる。 Thus heat generated by the LED elements 3 are dissipated in heat dissipation fins f, obtain high heat dissipation effect.

また、基板2の側端部2yを、反射部本体11及びフィン支持部122で支持しているため、基板2を可及的に薄くしても、LED素子3を焦点位置又はその近傍に確実に支持することができ、しかも、基板2の厚みが大きいものと比べて大光量を得られる。 Further, the side end portion 2y of the substrate 2, since the support by the reflecting body 11 and the fin support 122, even by reducing the substrate 2 as much as possible, ensure LED element 3 to the focal position or the vicinity thereof can be supported, moreover, be obtained a large amount of light as compared with those thickness of the substrate 2 is large.

なお、本実施形態では、基板2の表面及び裏面にそれぞれ配したLED素子3の両方から光を照射するようにしているが、例えば、各LED素子3に供給する電力のON・OFF切り替えにより、表面又は裏面に配したLED素子3のみから、光を照射するように構成することもできる。 In the present embodiment, although both of the LED elements 3 arranged respectively on the front and back surfaces of the substrate 2 so as to irradiate light, for example, by ON · OFF switching of the power supplied to the LED elements 3, only LED elements 3 arranged on the surface or back surface could also be configured to irradiate light. このような構成を採用することによって、いわゆる「ハイビーム」及び「ロービーム」と呼ばれる照射態様を実現することができ、車両用ヘッドライトとして好適に用いることができる。 By adopting such a configuration, a so-called can be realized illumination mode called "high beam" and "low beam", it can be suitably used as a headlight for a vehicle.

このように本実施形態にかかる照明装置Aによれば、LED素子3の熱を、側端部2y全体を利用して効率的に放熱でき、該LED素子3の出射する光をロス無く大光量の平行光を得られ、車両用ヘッドライトとして好適に使用することができる。 Thus, according to the illumination device A according to this embodiment, the heat of the LED elements 3, can be efficiently radiated by utilizing the entire side end portion 2y, without any loss large amount of light emission of the LED elements 3 obtained the parallel light can be suitably used as a headlight for a vehicle.

なお、本発明は前記実施形態に限られるものではない。 The present invention is not limited to the embodiment.

例えば、前記実施形態の照明装置Aは、車両用ヘッドライトとしてだけでなく、例えば、劇場用のスポットライトや、手術用のスポットライトとしても用いることができる。 For example, the illumination device A of the embodiment, not only as a headlight for a vehicle, for example, can be used spotlights or theater, as a spot light for surgery.

また、基板2の側端部2yを、反射部本体11及びフィン支持部122のそれぞれに挟まれた状態とせず、単に、側端部2yを反射面11aに接続するようにしてもよい。 Further, the side end portion 2y of the substrate 2, not in a state of being sandwiched between each of the reflective portion main body 11 and the fin support 122 simply may be connected to the side end portion 2y on the reflecting surface 11a. かかる構成としても、上記実施形態と同様の放熱効果を得られる。 Even such a configuration, obtain the same heat radiation effect as the above embodiment.

開口11zに臨ませて図示しない光ファイバを接続可能なロッドレンズの光導入端を配してもよい。 An optical fiber (not shown) so as to face the opening 11z may be disposed a light introducing end connectable rod lens. このとき、ロッドレンズの光導入端の径と開口11zの径とを略等しくすれば、例えば、LED素子3の配置位置に多少のずれがあっても、そのLED素子3が出射する全ての光を利用することができる。 In this case, if substantially equal to the diameters of the opening 11z of the light introducing end of the rod lens, for example, even if there is some deviation in the position of the LED element 3, all of the light that LED element 3 is emitted it can be utilized.

反射面11aの形状を、図8に示す点S2bと2つのLED素子3を配設する共通の位置である点S2aとをそれぞれ楕円の焦点とし、これら焦点S2bとS2aとを結ぶ楕円の長軸Zを回転中心軸として、その楕円を回転して形成できる回転楕円面形状としても構わない。 The shape of the reflecting surface 11a, and the focus of each ellipse a common location at which point S2a and the disposing of S2b and two LED elements 3 points shown in FIG. 8, the major axis of the ellipse connecting the these focal S2b and S2a as the center of rotation axis Z, it may be a spheroidal shape can be formed by rotating the ellipse.

かかる構成によれば、図9に示すように、LED素子3が出射する殆どの光を、回転楕円面の他方の焦点S2bに集光することができる。 According to such a configuration, as shown in FIG. 9, most of the light emitted from the LED element 3 is emitted, it can be focused on the other focal point S2b of spheroid.

ここで、LED素子3が出射する光は光軸3zを中心に立体角状に広がるが、広がった光は、回転楕円面形状を有する反射面11aによって、焦点S2bにおける集光角度は前記立体角より小さくなるため、入射角度が大きいと良好な性能を得られない光ファイバに好適に用いることができる。 Here, the light emitted from the LED element 3 is emitted spreads solid angle shape around the optical axis 3z, spread light by the reflecting surface 11a having a spheroidal shape, the collection angle at the focal point S2b the solid angle to become smaller, can be suitably used for an optical fiber can not be obtained a good performance and a large angle of incidence.

したがって、光導入端41を回転楕円面の他方の焦点S2bに臨ませた例えばプラスティック製の光ファイバ(図示せず)を接続可能なロッドレンズ4(本発明の「ライトガイド」に相当)を設ければ、大光量の光を光導出端に導くことができ、大光量の光を利用した製品検査などに好適に用いることができるようになる。 Therefore, provided the light introduction end 41 spheroid other focal point S2b (not shown) optical fiber manufactured thereby have eg plastic face the possible connection rod lens 4 (corresponding to the "light guide" of the present invention) lever, it is possible to guide light of a large amount to the light outlet end, so that it is suitably used in such products inspection using light having a large light quantity. なお、ロッドレンズを介さずに、光ファイバ(図示せず)を焦点S2bに直接臨ませてもよい。 Incidentally, without passing through the rod lens, an optical fiber (not shown) may be to face directly to the focal point S2b.

また、反射面11aを、回転放物面形状又は回転楕円面形状とすることで、該反射面11aを照射光軸Z方向から見たときの開口11zの形状が略円形状を有するようにしているが、その開口形状を、例えば楕円形状や矩形形状とすることもできる。 Further, the reflecting surface 11a, by a parabolic shape or spheroidal shape, the shape of the opening 11z when viewed the reflecting surface 11a from the irradiation optical axis Z direction so as to have a substantially circular It is, but it can also be the opening shape, for example, an elliptical shape or a rectangular shape.

また、反射面11aの断面形状は、放物線形状(二次曲線定数k=−1)又は楕円形状(−1<k<0)に限らず、例えば、双曲線形状(k<−1且つk≒−1)等とすることもできる。 The cross-sectional shape of the reflecting surface 11a is not limited to a parabolic shape (quadratic curve constant k = -1) or elliptical shape (-1 <k <0), for example, hyperbolic (k <-1 and k ≒ - It may be a 1) or the like.

また、図11、図12に示すように、放熱フィンfを、反射部本体11に設けることができる。 Further, FIG. 11, as shown in FIG. 12, the heat radiation fins f, can be provided to the reflecting body 11. このように、放熱フィンfを、反射部本体11及び放熱部12の両方に設けることで、より高い放熱効果を得られる。 Thus, the heat radiation fins f, by providing for both the reflective body 11 and the heat radiating portion 12, resulting in higher heat dissipation effect.

また、図13に示すように、反射部1を、照射軸方向Zから見たときに略放射状に配される複数の板状の放熱フィンfと、これら各放熱フィンf間に形成される通風路gとを備えるものとすることができる。 Further, as shown in FIG. 13, the reflection portion 1, a plurality of plate-shaped heat dissipating fins f which is arranged substantially radially when viewed from the irradiation direction Z, is formed between these respective radiation fins f ventilation it can be made and a road g. このような構成によれば、例えば、放熱フィンfの開口11z側から空気を当てると、その空気は、放熱フィンfから熱を奪い取りながら通風路gを通過し、反開口側から排出されるため、非常に高い放熱効果を得られる。 According to such a configuration, for example, when exposed to air from the opening 11z side of the heat radiating fins f, the air passes through the air passage g while robbing heat from the heat radiating fins f, to be discharged from the counter-opening side , resulting a very high heat dissipation effect. したがって、走行中等に開口11z側から空気が当たる車両用ヘッドライト等に好適に用いることができる。 Therefore, it can be suitably used for vehicle headlights impinging air from the opening 11z side running secondary.

また、図14に示すように、開口11zの径と略同一の径を有する光導入端FL1を備えたフレネルレンズFLを、その開口11zに臨ませて設けることもできる。 Further, as shown in FIG. 14, a Fresnel lens FL having a light introducing end FL1 with a diameter and the diameter of the substantially same opening 11z, it may be provided so as to face in the opening 11z. このような構成によれば、例えば、LED素子3の配置位置に誤差があったり、LED素子3が点光源とはみなせないようなものであったりしても、LED素子3が出射する全ての光を、フレネルレンズFLの焦点に集光させて利用することができる。 According to such a configuration, for example, or there is an error in the position of the LED element 3, also LED element 3 is or be as not be regarded in a point light source, all of the LED elements 3 is emitted light, is focused on the focal point of the Fresnel lens FL can be utilized. なお、フレネルレンズ以外のレンズや、光ファイバを接続可能なロッドレンズを設けることもできる。 It is also possible to provide or non Fresnel lens lens, a possible rod lens connecting optical fibers.

また、反射部1を、外観視略円柱形状としているが、例えば外観形状を、略矩形ブロック体形状(図示せず)とすることもできる。 Further, the reflection portion 1, although the appearance view substantially cylindrical shape, for example, the external shape may be a substantially rectangular block-like shape (not shown).

LED素子3に、面実装タイプのものを用いているが、例えば、半球型のものを用いることもできる。 The LED elements 3, are used those surface mount type, for example, it is also possible to use a hemispherical. 半球型であれば、出射光軸方向に出射される光と側方に出射される光とが略等しいため、面実装タイプのものよりも大光量を得られる。 If hemispherical, since the light emitted in the light and the side emitted for the emission light axis direction are substantially equal, obtain a large amount of light than that of the surface mount type.

また、図15、図16に示すように、基板2の各面に、複数のLED素子3(a)、3(b)、3(c)を互いに光軸の向きが異なるように集合させて搭載しても構わない。 Further, as shown in FIGS. 15 and 16, on each side of the substrate 2, a plurality of LED elements 3 (a), 3 (b), 3 (c) are each other in the optical axis direction by the set differently it may be mounted. 同図では、照射軸方向Zから見て台形状をなすブロック体BLを基板2上に載置し、そのブロック体BLの斜面及び頂面に、それぞれLED素子3(a)、3(b)、3(c)を搭載している。 In the drawing, the block body BL forming a by trapezoidal viewed from the irradiation axis Z is placed on the substrate 2, the slope and the top surface of the block body BL, respectively LED elements 3 (a), 3 (b) , it is equipped with a 3 (c). このようにすることで、LED素子3(a)は、その光軸が照射軸方向Zと垂直な面上であって基板2に垂直な角度になり、LED素子3(b)は、その光軸が、照射軸方向Zと垂直な面上であって基板2に対して60°傾斜した角度になり、LED素子3(c)は、その光軸が、同じく照射軸方向Zと垂直な面上であって基板2に対して−60°傾斜した角度になる。 In this way, LED element. 3 (a), the optical axis is perpendicular angle to the irradiation direction Z and the substrate 2 even on vertical surface, LED element. 3 (b), the light axis, becomes the irradiation direction Z and 60 ° oblique angle a on the vertical plane with respect to the substrate 2, LED element. 3 (c), the optical axis thereof, similarly irradiation axis direction Z perpendicular to the plane a top becomes -60 ° oblique angle with respect to the substrate 2.

そして、このことにより、開口11zでの照度ムラ、ひいては光照射対象面での照度ムラを軽減することができる。 By this, the uneven illuminance at the opening 11z, it is possible to reduce the uneven illuminance in turn irradiation target surface. これは、以下の理由による。 This is due to the following reasons. すなわち、前記実施形態のように、基板2に搭載されるLED素子の搭載角度が単一であると、その光軸方向の光が強くなって、この場合であれば、照射軸方向Zからみて縦長の光となる(図17の符号s1が、その場合の光の断面形状のイメージを表す)。 That is, as in the above embodiment, when the mounting angle of the LED element mounted on the substrate 2 is a single, the optical axis direction of the light becomes stronger, if this case, not viewed from the irradiation direction Z the elongated light (reference numeral s1 of FIG. 17, representing the image of the cross-sectional shape of the case, light). これに対して、光軸方向が異なる(ここでは光軸方向が等間隔となるようにしている)複数のLED素子3(a)、3(b)、3(c)を設けることで、各LED素子3(a)、3(b)、3(c)からの光が重合し、円形状に近い、ムラの少ない光を照射することができるようになる(図17の符号s2が、その光の断面形状のイメージを表す)。 In contrast, the optical axis direction are different (here so that the optical axis direction becomes equal interval) a plurality of LED elements 3 (a), 3 (b), by providing a 3 (c), the LED element 3 (a), 3 (b), and light polymerization from 3 (c), close to a circular shape, it is possible to irradiate the less light unevenness (sign s2 of Figure 17, the It represents an image of the light cross-sectional shape). もちろん、LED素子の数は3つに限られず、2つ又は4つ以上でも構わないし、それらLED素子を搭載するブロック体は、台形状のみならず、多角形状をなすものや、球形状のものでもよい。 Of course, the number of LED elements is not limited to three, to may be two or four or more, the block body for mounting them LED element is not trapezoidal only, and that forms a polygonal shape, those spherical But good.

また、反射面11aを、反射部本体11から着脱可能に構成することもできる。 Further, the reflecting surface 11a, may be detachably attached to the reflector body 11. この場合、反射面11aは、反射部本体11と異なる材質(例えば樹脂製)とすることもできる。 In this case, the reflective surface 11a may also be a material different from the reflective body 11 (e.g., resin).

また、反射面11aにRGB蛍光体を塗布しておき、LED素子3から、例えば、波長が405nmの光を出射して白色光を得られるようにすることもできる。 Alternatively, it is applied to RGB phosphors on the reflecting surface 11a, the LED elements 3, for example, be wavelengths to obtain a by emitting 405nm light white light.

その他、各部の具体的構成についても上記実施形態に限られるものではなく、本発明の趣旨を逸脱しない範囲で種々変形が可能である。 Other, not limited to the above embodiment is also specific configuration of each part, there may be various modifications without departing from the scope of the present invention.

本発明の実施形態における照明装置を示す全体斜視図。 Overall perspective view of the lighting device in the embodiment of the present invention. 同実施形態における照明装置の正面図。 A front view of the lighting apparatus in the same embodiment. 図2におけるd1−d1断面図。 d1-d1 sectional view in FIG. 同実施形態における照明装置の平面図。 Plan view of the lighting apparatus in the same embodiment. 同実施形態におけるLED素子の取付態様を示す要部拡大平面図。 Enlarged plan view showing the mounting manner of the LED element in the embodiment. 同実施形態におけるLED素子の取付部分を示す要部拡大断面図(図5におけるd2−d2断面図)。 Enlarged sectional view showing a mounting portion of the LED element in the same embodiment (d2-d2 sectional view in FIG. 5). 同実施形態におけるLED素子の取付部分近傍を示す要部拡大断面図(図5におけるd3−d3断面)。 Enlarged sectional view showing the attachment portion near the LED element in the same embodiment (d3-d3 cross section in FIG. 5). 同実施形態における照明装置の作用説明図。 Operation explanatory view of the lighting apparatus in the same embodiment. 本発明の他の実施形態における照明装置の断面図。 Cross-sectional view of a lighting apparatus according to another embodiment of the present invention. 同実施形態における照明装置の作用説明図。 Operation explanatory view of the lighting apparatus in the same embodiment. 本発明のさらに他の実施形態における照明装置の全体斜視図。 Overall perspective view of a lighting device according to yet another embodiment of the present invention. 同実施形態における照明装置の断面図。 Sectional view of the lighting apparatus in the same embodiment. 本発明のさらに他の実施形態における照明装置の全体斜視図。 Overall perspective view of a lighting device according to yet another embodiment of the present invention. 本発明のさらに他の実施形態における照明装置の作用説明図。 Operation explanatory view of the lighting apparatus in still another embodiment of the present invention. 本発明のさらに他の実施形態における照明装置の全体斜視図。 Overall perspective view of a lighting device according to yet another embodiment of the present invention. 同実施形態におけるLED素子の搭載態様を示す部分拡大図。 Partially enlarged view showing the mounting manner of the LED element in the embodiment. 同実施形態における光の照射態様を示すイメージ図。 Image diagram showing a radiation mode of light in the embodiment.

符号の説明 DESCRIPTION OF SYMBOLS

1・・・・・反射部2・・・・・伝熱部材(基板) 1 ..... reflectors 2 ----- heat transfer member (substrate)
3・・・・・LED素子3x・・・・出射光軸4・・・・・ライトガイド(ロッドレンズ) 3 ----- LED element 3x · · · · exit optical axis 4 ..... light guide (rod lenses)
11・・・・反射部本体11a・・・反射面11z・・・開口41・・・・光導入端f・・・・・放熱フィンA・・・・・照明装置(車両用ヘッドライト) 11 ... reflecting section body 11a · · · reflecting surface 11z · · · opening 41 .... light introduction end f · · · · · radiating fins A · · · · · lighting device (a vehicle headlight)
FL・・・・ライトガイド(フレネルレンズ) FL ···· light guide (Fresnel lens)
Z・・・・・装置全体の照射光軸(反射面11aの回転中心軸) Z · · · · · whole apparatus irradiating the optical axis (the rotation center axis of the reflecting surface 11a)
S1・・・・放物線(回転放物面)の焦点S2a・・・楕円(回転楕円面)の一方の焦点S2b・・・楕円(回転楕円面)の他方の焦点 S1 · · · · other focus of the parabola focus S2a · · · elliptical one focal S2b · · · ellipse (spheroid) of (spheroid) of (paraboloid of revolution)

Claims (11)

  1. 装置全体の照射光軸を含む面内に配される平板状の伝熱部材と、 A planar heat transfer member that is disposed in a plane including the irradiation optical axis of the entire device,
    前記面と直交する断面の形状が放物線形状又は楕円形状の反射面を有する反射部と、 A reflecting section shape of the cross section perpendicular to the surface has a reflecting surface of parabolic or elliptical shape,
    素子の出射光軸が前記照射光軸と直交する状態で、前記放物線の焦点位置若しくはその近傍又は前記楕円の一方の焦点位置若しくはその近傍にて前記伝熱部材に支持されるLED素子とを具備し、 In a state where the emission optical axis of the device is perpendicular to the illumination optical axis, and a LED element is supported by the heat transfer member at one of the focal position or its vicinity of the focal position or its vicinity or the oval of the parabola and,
    前記伝熱部材の側端部を、前記反射面に接続している照明装置。 The side edge portions of the heat transfer member, the lighting devices connected to the reflective surface.
  2. 前記反射面が、回転放物面形状又は回転楕円面形状である請求項1記載の照明装置。 The reflecting surface, the illumination apparatus according to claim 1, wherein the paraboloid shape or spheroidal shape.
  3. 前記伝熱部材の表面及び裏面で、前記LED素子をそれぞれ支持している請求項1又は2記載の照明装置。 The heat transfer surface and the back surface of the heat member, an illumination apparatus according to claim 1 or 2 wherein supports the LED element, respectively.
  4. 前記伝熱部材が、前記LED素子の電極を兼ねている請求項1乃至3いずれか記載の照明装置。 It said heat transfer member, the lighting device according to any one of the preceding claims also serves as the electrode LED elements 1 to 3.
  5. 前記反射部は、前記反射面で反射させた光を外部へ導出する開口を有し、 The reflective portion has an opening for deriving the light reflected by the reflecting surface to the outside,
    前記側端部は、前記伝熱部材の前記開口に臨む端部以外の全ての端部である請求項1乃至4いずれか記載の照明装置。 The end, the illumination device of any of any one of claims 1 to 4 which is an end portion other than the end portion facing the opening of the heat transfer member.
  6. 前記反射部は、内部に前記反射面を形成した反射部本体と、この反射部本体に連続して設けた放熱フィンとを具備している請求項1乃至5いずれか記載の照明装置。 The reflective portion includes a reflective body formed with the reflective surface inside, the lighting device according to claim 1 to 5 or are provided with a heat radiation fin which is provided continuously to the reflecting body.
  7. 光導入端を、前記楕円の他方の焦点に臨ませたライトガイドを具備している請求項1乃至6いずれか記載の照明装置。 The light introduction end, the ellipse of the other illumination device comprises a face was light guide to focus and according to any one of claims 1 to 6.
  8. 光導入端を、前記反射面で反射させた光を外部へ導出する前記反射部の開口に望ませたライトガイドを具備し、 The light introduction end, provided with the light guide which has desired opening of the reflector unit that derives the light reflected to the outside by the reflecting surface,
    前記反射部の開口径と前記光導入端の径とを略等しくしている請求項1乃至6いずれか記載の照明装置。 The reflective portion substantially equal to that of claims 1 to 6 lighting device according to any the opening diameter and the diameter of the light introducing end of.
  9. 前記伝熱部材の表裏各面において、それぞれ複数のLED素子を互いの出射光軸の向きを異ならせて集合配置している請求項1乃至8いずれか記載の照明装置。 In the front and back surfaces of the heat transfer member, each lighting device of the plurality of LED elements according to any one of claims 1 to 8 are collectively arranged at different orientations to each other of the exit optical axis.
  10. 前記複数のLED素子が、ブロック体上に配置され、そのブロック体を前記伝熱部材に支持させている請求項9記載の照明装置。 Wherein the plurality of LED elements are arranged on the block body, the lighting device according to claim 9, characterized in that by supporting the block body to the heat transfer member.
  11. 装置全体の照射光軸を含む面内に配される平板状の伝熱部材と、 A planar heat transfer member that is disposed in a plane including the irradiation optical axis of the entire device,
    前記面と直交する断面の輪郭形状が放物線形状の反射面を有する反射部と、 A reflecting section contour shape of the cross section perpendicular to the surface has a reflecting surface of the parabolic shape,
    素子の出射光軸が前記照射光軸と直交する状態で、前記放物線の焦点位置若しくはその近傍にて前記伝熱部材に支持されるLED素子とを具備し、 In a state where the emission optical axis of the device is perpendicular to the irradiation optical axis, comprising an LED element which is supported by the heat transfer member at the focal position or the vicinity thereof of the parabola,
    前記伝熱部材の側端部を、前記反射面に接続している車両用ヘッドライト。 The heat transfer side edges of the heat member, a headlight for a vehicle is connected to the reflecting surface.
JP2007271688A 2007-10-18 2007-10-18 Lighting device Expired - Fee Related JP5097916B2 (en)

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