JP2007005218A - Light emitting apparatus and lighting equipment provided therewith - Google Patents

Light emitting apparatus and lighting equipment provided therewith Download PDF

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JP2007005218A
JP2007005218A JP2005186322A JP2005186322A JP2007005218A JP 2007005218 A JP2007005218 A JP 2007005218A JP 2005186322 A JP2005186322 A JP 2005186322A JP 2005186322 A JP2005186322 A JP 2005186322A JP 2007005218 A JP2007005218 A JP 2007005218A
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light
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light emitting
lens
emitting device
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JP4635741B2 (en
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Hiroyuki Sekii
広行 関井
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To reduce unevenness in color occurring in an irradiated surface, in a light emitting apparatus provided with: white light emitting diode which is a combination of blue LED element and phosphor; and a lens with a concave part formed to surround the front direction of a light emitting surface of the white LED, and in a lighting equipment provided with the light emitting apparatus. <P>SOLUTION: The lens 3 of the light emitting apparatus 1 is provided with: a first light incident surface 31 facing the front surface of the light emitting surface of the white LED2; a second light incident surface 32 facing a diagonal front direction of the light emitting surface of the LED2; a reflecting surface 33 reflecting light made incident inside the lens 3 by the second incident surface 32; and an emitting surface 34 emitting light which is made incident inside the lens 3 from the first incident surface 31, and which is made incident inside the lens 3 from the second incident surface 32 and reflected by the reflecting surface 33. The unevenness occurring in the irradiated surface 9 is reduced by having pale blue light and yellowish light emitted in various directions from white LED 2 combined by applying optical dispersion processing to the second light incident surface 32, the reflecting surface 33 or the emitting surface 34 of the lens 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、白色ＬＥＤ（Ｌｉｇｈｔ Ｅｍｉｔｔｉｎｇ Ｄｉｏｄｅ）を備えた発光装置及びこの発光装置を備えた照明器具に関する。   The present invention relates to a light-emitting device including a white LED (Light Emitting Diode) and a lighting fixture including the light-emitting device.

従来のこの種の発光装置としては、例えば、図９に示されるように、青色ＬＥＤ素子１２１と、青色ＬＥＤ素子１２１から出射された青色光を波長変換する蛍光体１２２とから成る白色ＬＥＤ１０２を備えている。このような白色ＬＥＤ１０２においては、一般に、光の利用効率を高めるために複数の青色ＬＥＤ素子１２１を用いており、青色ＬＥＤ素子１２１を白色ＬＥＤ１０２の中央付近に集中して配置することが多い。このため、白色ＬＥＤ１０２の発光面１０２ａの中央付近から出射される光は、青色ＬＥＤ素子１２１から蛍光体１２２の表面に至る距離が短いため、黄色光に変換される光の割合が少なくなり青白い光となる。一方、発光面１０２ａの端部付近から出射される光は、青色ＬＥＤ素子１２１から蛍光体１２２の表面に至る距離が長いため、黄色光に変換される光の割合が多くなり黄色みを帯びた光となる。図９において、発光面１０２ａの中央付近から出射される光をＬ１、発光面１０２ａの中央と端部との中間付近から出射される光をＬ２、発光面１０２ａの端部付近から出射される光をＬ３として示す。   As a conventional light emitting device of this type, for example, as shown in FIG. 9, a white LED 102 including a blue LED element 121 and a phosphor 122 that converts the wavelength of blue light emitted from the blue LED element 121 is provided. ing. In such a white LED 102, in general, a plurality of blue LED elements 121 are used in order to increase the light utilization efficiency, and the blue LED elements 121 are often concentrated near the center of the white LED 102. For this reason, the light emitted from the vicinity of the center of the light emitting surface 102a of the white LED 102 has a short distance from the blue LED element 121 to the surface of the phosphor 122. It becomes. On the other hand, the light emitted from the vicinity of the end portion of the light emitting surface 102a has a long distance from the blue LED element 121 to the surface of the phosphor 122, so that the ratio of the light converted into yellow light increases and becomes yellowish. It becomes light. In FIG. 9, light emitted from the vicinity of the center of the light emitting surface 102a is L1, light emitted from the vicinity of the middle and the end of the light emitting surface 102a is L2, and light emitted from the vicinity of the end of the light emitting surface 102a. Is denoted as L3.

このような白色ＬＥＤ１０２からの光を、レンズ等を用いずに照射面９に照射する場合、照射範囲の中央付近に照射される光は青白い光となり、照射範囲の端部付近に照射される光は黄色みを帯びた光となる。このように照射範囲の中央付近と、端部付近の光色が異なる場合であっても、レンズ等を用いない場合には、照射面９において色が中央から端部に亘って連続的に変化するため、あまり問題とならない場合が多い。   When irradiating the irradiation surface 9 with such light from the white LED 102 without using a lens or the like, the light irradiated near the center of the irradiation range becomes pale light, and the light irradiated near the end of the irradiation range. Becomes yellowish light. As described above, even when the light color near the center of the irradiation range and the vicinity of the end are different, when a lens or the like is not used, the color continuously changes from the center to the end on the irradiation surface 9. In many cases, this is not a problem.

しかしながら、レンズ等を用いずに白色ＬＥＤ１０２のみで発光装置を形成した場合、配光が広角になり、一部の用途にしか使用できないという問題がある。そこで、図１０に示されるように、発光装置１０１の出射効率を高めるために、白色ＬＥＤ１０２の発光面１０２ａの前方を取り囲むように凹部１３０が形成され、白色ＬＥＤ１０２から出射された光を狭角に集光できるハイブリッドレンズ１０３を用いることが知られている（例えば、特許文献１参照）。なお、ハイブリッドレンズ１０３は、２種類の光路を利用して白色ＬＥＤ１０２から出射される光を集光し、２種類の集光方法を混成して利用することから、このように称している。   However, when the light emitting device is formed only by the white LED 102 without using a lens or the like, there is a problem that the light distribution becomes wide-angle and can be used only for some applications. Therefore, as shown in FIG. 10, in order to increase the emission efficiency of the light emitting device 101, a recess 130 is formed so as to surround the front of the light emitting surface 102a of the white LED 102, and the light emitted from the white LED 102 is narrowed. It is known to use a hybrid lens 103 that can collect light (see, for example, Patent Document 1). The hybrid lens 103 is referred to as such because the light emitted from the white LED 102 is condensed using two types of optical paths and the two types of condensing methods are used in combination.

ハイブリッドレンズ１０３は、白色ＬＥＤ１０２の発光面１０２ａの正面に対向して凹部１３０の底面に位置する第１の入射面１３１と、白色ＬＥＤ１０２の発光面１０２ａの斜め前方に対向して凹部１３０の側面に位置する第２の入射面１３２と、第２の入射面１３２より該レンズ１０３内部に入射された光を反射する反射面１３３と、第１の入射面１３１より該レンズ１０３内部に入射された光、及び、第２の入射面１３２より該レンズ１０３内部に入射され、且つ、反射面１３３で反射された光を出射する出射面１３４とを有している。   The hybrid lens 103 is opposed to the front surface of the light emitting surface 102a of the white LED 102 and is positioned on the bottom surface of the concave portion 130, and on the side surface of the concave portion 130 facing diagonally forward of the light emitting surface 102a of the white LED 102. A second incident surface 132 that is positioned, a reflecting surface 133 that reflects light incident on the lens 103 from the second incident surface 132, and light that is incident on the lens 103 from the first incident surface 131. And an exit surface 134 that emits light that is incident on the inside of the lens 103 from the second entrance surface 132 and reflected by the reflecting surface 133.

上記発光装置１０１は、第１の入射面１３１より該レンズ１０３内部に入射され、出射面１３４から出射される光と、第２の入射面１３２より該レンズ１０３内部に入射され、更に反射面１３３で反射されて出射面１３４から出射される光とを利用して、白色ＬＥＤ１０２から出射される光を高効率に集光する。
特開昭６０−１３０００１号公報 The light emitting device 101 is incident on the inside of the lens 103 from the first incident surface 131, is emitted from the exit surface 134, is incident on the inside of the lens 103 from the second entrance surface 132, and is further reflected on the reflecting surface 133. The light emitted from the white LED 102 is condensed with high efficiency using the light reflected from the light and emitted from the emission surface 134.
JP-A-60-130001

ところで、青色ＬＥＤ素子１２１と蛍光体１２２とを組み合わせた白色ＬＥＤ１０２と、ハイブリッドレンズ１０３とを備えた発光装置１０１においては、次のような問題がある。上述したように、ハイブリッドレンズ１０３は、２種類の光路を利用して白色ＬＥＤ１０２から出射される光を集光するため、これら光路の違いによって、図１０に示したように、照射面９において発光面１０２ａの端部付近から出射された黄色みを帯びた光Ｌ３が、発光面１０２ａの中央付近から出射された青白い光の近傍に照射されるなど、照射面９において色の変化が不連続になる部分が生じる。このため、人間の目には大きな色ムラとして感じ易いものとなる。   By the way, in the light-emitting device 101 provided with the white LED 102 combining the blue LED element 121 and the phosphor 122 and the hybrid lens 103, there are the following problems. As described above, the hybrid lens 103 condenses the light emitted from the white LED 102 using two types of optical paths. Therefore, as shown in FIG. The yellowish light L3 emitted from the vicinity of the end of the surface 102a is irradiated in the vicinity of pale light emitted from the vicinity of the center of the light emitting surface 102a. The part which becomes becomes. For this reason, it becomes easy for human eyes to feel as large color unevenness.

本発明は、このような問題を解消するものであり、青色ＬＥＤ素子と蛍光体とを組み合わせた白色ＬＥＤと、該白色ＬＥＤの発光面の前方を取り囲むように凹部が形成されたレンズとを有する発光装置、及びこの発光装置を備えた照明器具において、照射面に発生する色ムラを低減することを目的とする。   The present invention solves such a problem, and includes a white LED in which a blue LED element and a phosphor are combined, and a lens in which a recess is formed so as to surround the front of the light emitting surface of the white LED. An object of the present invention is to reduce color unevenness generated on an irradiation surface in a light-emitting device and a lighting fixture including the light-emitting device.

上記目的を達成するために請求項１の発明は、青色ＬＥＤ素子と、この青色ＬＥＤ素子から出射された青色光を波長変換する蛍光体とを組み合わせた白色ＬＥＤと、この白色ＬＥＤから出射される光が入射され、該白色ＬＥＤの発光面の前方を取り囲むように凹部が形成されたレンズとを備え、前記レンズは、前記白色ＬＥＤの発光面の正面に対向して前記凹部の底面に位置する第１の入射面と、前記白色ＬＥＤの発光面の斜め前方に対向して前記凹部の側面に位置する第２の入射面と、前記第２の入射面よりレンズ内部に入射された光を反射する反射面と、前記第１の入射面よりレンズ内部に入射された光、及び、前記第２の入射面よりレンズ内部に入射され、且つ、前記反射面で反射された光を出射する出射面とを有する発光装置において、前記第２の入射面に光拡散処理が施されていることを特徴とする。   In order to achieve the above object, the invention of claim 1 is a white LED that combines a blue LED element and a phosphor that converts the wavelength of blue light emitted from the blue LED element, and the white LED emits light. And a lens having a recess formed so as to surround the front surface of the light emitting surface of the white LED, and the lens is positioned on the bottom surface of the recess facing the front surface of the light emitting surface of the white LED. Reflects light incident on the inside of the lens from the first incident surface, a second incident surface located on the side surface of the concave portion facing diagonally forward of the light emitting surface of the white LED, and the second incident surface. A reflecting surface that emits light that has entered the lens from the first incident surface and light that has entered the lens from the second incident surface and has been reflected by the reflecting surface. A light emitting device having , Characterized in that the light diffusion treatment is applied to the second incident surface.

請求項２の発明は、請求項１に記載の発光装置において、前記光拡散処理が、前記第２の入射面に替えて前記反射面に施されていることを特徴とする。   According to a second aspect of the present invention, in the light emitting device according to the first aspect, the light diffusion treatment is performed on the reflecting surface instead of the second incident surface.

請求項３の発明は、請求項１に記載の発光装置において、前記光拡散処理が、前記第２の入射面に替えて前記出射面に施されていることを特徴とする。   According to a third aspect of the present invention, in the light emitting device according to the first aspect, the light diffusion treatment is performed on the emission surface instead of the second incident surface.

請求項４の発明は、請求項１乃至請求項３のいずれかに記載の発光装置を備えたことを特徴とする照明器具である。   According to a fourth aspect of the present invention, there is provided a lighting apparatus comprising the light emitting device according to any one of the first to third aspects.

本発明の発光装置によれば、レンズの第２の入射面、反射面、又は出射面に光拡散処理が施されているので、白色ＬＥＤから各種方向に出射される青白い光乃至黄色みを帯びた光の一部が、光拡散処理が施された面で拡散され、照射面で混ざり合う。このため、照射面における色の変化がなだらかになり光拡散処理を施さない場合と比較して照射面における色ムラを低減することができる。   According to the light emitting device of the present invention, since the light is diffused on the second incident surface, reflecting surface, or exit surface of the lens, the white LED emits pale light or yellowish light emitted in various directions. A part of the reflected light is diffused on the surface subjected to the light diffusion treatment and mixed on the irradiated surface. For this reason, the color change on the irradiated surface becomes smooth, and color unevenness on the irradiated surface can be reduced as compared with the case where the light diffusion treatment is not performed.

また、本発明の照明器具によれば、色ムラが低減された発光装置を備えるので、高品質の白色光を得ることができ、演色性の高い照明器具を提供することができる。   Moreover, according to the lighting fixture of this invention, since the light-emitting device with which the color nonuniformity was reduced is provided, high quality white light can be obtained and a lighting fixture with high color rendering property can be provided.

以下、本発明の第１の実施形態に係る発光装置について図１及び図２を参照して説明する。発光装置１は、青色ＬＥＤ素子２１と、この青色ＬＥＤ素子２１から出射された青色光を波長変換する蛍光体２２とを組み合わせた白色ＬＥＤ２と、この白色ＬＥＤ２から出射される光が入射され、該白色ＬＥＤ２の発光面２ａの前方を取り囲むように凹部３０が形成されたハイブリッドレンズ３とを備えている。なお、図１、図３、図５、及び図１０の断面図においては、ハイブリッドレンズ３のハッチングを省略して示している。   Hereinafter, a light emitting device according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The light emitting device 1 receives a white LED 2 that combines a blue LED element 21 and a phosphor 22 that converts the wavelength of blue light emitted from the blue LED element 21, and light emitted from the white LED 2. And a hybrid lens 3 in which a recess 30 is formed so as to surround the front of the light emitting surface 2a of the white LED 2. In the cross-sectional views of FIGS. 1, 3, 5, and 10, the hybrid lens 3 is not hatched.

青色ＬＥＤ素子２１及び蛍光体２２を形成する材料は、特に限定されるものではなく、例えば、青色ＬＥＤ素子２１にはＩｎＧａＮ系の材料が用いられ、蛍光体２２には（Ｙ，Ｇｄ）３（Ａｌ，Ｇａ）５Ｏ１２：Ｃｅ３＋系蛍光体が用いられる。 The material forming the blue LED element 21 and the phosphor 22 is not particularly limited. For example, an InGaN-based material is used for the blue LED element 21, and (Y, Gd) 3 ( Al, Ga) 5 O 12 : Ce 3+ phosphor is used.

ハイブリッドレンズ３は、白色ＬＥＤ２の発光面２ａの正面に対向して凹部３０の底面に位置する第１の入射面３１と、白色ＬＥＤ２の発光面２ａの斜め前方に対向して凹部３０の側面に位置する第２の入射面３２と、第２の入射面３２よりレンズ３内部に入射された光を反射する反射面３３と、第１の入射面３１よりレンズ３内部に入射された光、及び、第２の入射面３２よりレンズ３内部に入射され、且つ、反射面３３で反射された光を出射する出射面３４とを有している。なお、ハイブリッドレンズ３を形成する材料は特に限定されるものではなく、公知の透明樹脂やガラス等が用いられる。   The hybrid lens 3 faces the front surface of the light emitting surface 2 a of the white LED 2 and faces the first incident surface 31 located on the bottom surface of the concave portion 30, and diagonally forward of the light emitting surface 2 a of the white LED 2 on the side surface of the concave portion 30. A second incident surface 32 that is positioned, a reflecting surface 33 that reflects light incident on the inside of the lens 3 from the second incident surface 32, light that is incident on the inside of the lens 3 from the first incident surface 31, and And an exit surface 34 for emitting the light incident on the inside of the lens 3 from the second entrance surface 32 and reflected by the reflecting surface 33. In addition, the material which forms the hybrid lens 3 is not specifically limited, A well-known transparent resin, glass, etc. are used.

第１の入射面３１は、白色ＬＥＤ２側に凸になるように形成された略球面を有しており、
白色ＬＥＤ２から入射された光を出射面３４に向けて屈折させる。第２の入射面３２は、凹部３０の開口が凹部３０の底面より広くなるようにテーパー状に形成されており、白色ＬＥＤ２から入射された光を反射面３３に向けて屈折させる。反射面３３は、第２の入射面３２の凹部３０の開口側の端部３５から出射面３４の端部に至る曲面を有しており、後述する光拡散処理が第２の入射面３２に施されていない状態で、第２の入射面３２から反射面３３に入射された光を略全反射できるように形成されている。なお、以下においては、第２の入射面３２の凹部３０の開口側の端部３５をハイブリッドレンズ３の角部という。出射面３４はハイブリッドレンズ３及び白色ＬＥＤ２の中心を通る光軸に対して略垂直な略平面となるように形成されている。 The first incident surface 31 has a substantially spherical surface formed so as to be convex toward the white LED 2 side.
The light incident from the white LED 2 is refracted toward the exit surface 34. The second incident surface 32 is tapered so that the opening of the recess 30 is wider than the bottom surface of the recess 30, and refracts the light incident from the white LED 2 toward the reflecting surface 33. The reflecting surface 33 has a curved surface that extends from the end portion 35 on the opening side of the concave portion 30 of the second incident surface 32 to the end portion of the exit surface 34, and a light diffusion process described later is applied to the second incident surface 32. In a state where it is not applied, the light incident from the second incident surface 32 to the reflecting surface 33 can be substantially totally reflected. In the following, the end portion 35 on the opening side of the concave portion 30 of the second incident surface 32 is referred to as a corner portion of the hybrid lens 3. The emission surface 34 is formed to be a substantially flat surface that is substantially perpendicular to the optical axis passing through the centers of the hybrid lens 3 and the white LED 2.

本実施形態において、第２の入射面３２には光拡散処理が施されている。このような光拡散処理は、例えば、図２（ａ）に示されるように、第２の入射面３２に酸化チタン等を拡散物質とするアクリル白色塗料を塗布し、塗膜４１を形成することにより行われる。また、図２（ｂ）に示されるように、第２の入射面３２に周期的なプリズム４２を形成することにより、第２の入射面３２に光拡散処理を施してもよく、図２（ｃ）に示されるように、第２の入射面３２に所定曲率を有する凹面４３又は凸面を形成することにより第２の入射面３２に光拡散処理を施すようにしてもよい。なお、ここで、凹面４３又は凸面とは、第２の入射面３２を、光が入射する側から見たときの凹面又は凸面をいう。図２（ｃ）において、凹面４３が形成される前の第２の入射面３２の形状を点線で示している。   In the present embodiment, the second incident surface 32 is subjected to a light diffusion process. In such a light diffusion process, for example, as shown in FIG. 2A, an acrylic white paint having a diffusion material such as titanium oxide is applied to the second incident surface 32 to form a coating film 41. Is done. Further, as shown in FIG. 2B, a light diffusion process may be performed on the second incident surface 32 by forming a periodic prism 42 on the second incident surface 32, as shown in FIG. As shown in c), the second incident surface 32 may be subjected to a light diffusion process by forming a concave surface 43 or a convex surface having a predetermined curvature on the second incident surface 32. Here, the concave surface 43 or the convex surface means a concave surface or a convex surface when the second incident surface 32 is viewed from the light incident side. In FIG. 2C, the shape of the second incident surface 32 before the concave surface 43 is formed is indicated by a dotted line.

このような光拡散処理は、第２の入射面３２の全域に亘って施す必要はなく、少なくとも角部３５近傍の領域を含んで施される。ハイブリッドレンズ３の角部３５近傍に入射する光は、その他の領域に入射する光と比較して最も黄色みを帯びた光Ｌ３の割合が多い。このため、角部３５近傍の第２の入射面３２に光拡散処理を施すことにより、図１に示すように、黄色みを帯びた光Ｌ３が照射面９において広範囲に到達することになる。このため、例えば、照射面９の中央に到達した黄色みを帯びた光Ｌ３が、照射面９の中央に到達した青白い光Ｌ１等と混ざり合うこととなり、その結果、照射面９における色の変化がなだらかになり光拡散処理を施さない場合と比較して照射面９に色ムラが生じ難くなる。   Such a light diffusion process does not need to be performed over the entire area of the second incident surface 32, and is performed including at least a region near the corner portion 35. The light incident on the vicinity of the corner portion 35 of the hybrid lens 3 has a larger proportion of the light yellowish light L3 than the light incident on the other regions. For this reason, by performing the light diffusion process on the second incident surface 32 in the vicinity of the corner portion 35, the yellowish light L3 reaches a wide range on the irradiation surface 9 as shown in FIG. For this reason, for example, the yellowish light L3 that has reached the center of the irradiation surface 9 is mixed with the pale light L1 that has reached the center of the irradiation surface 9, and as a result, the color of the irradiation surface 9 changes. As a result, the color becomes gentle and color unevenness is less likely to occur on the irradiated surface 9 as compared with the case where the light diffusion treatment is not performed.

このように、本実施形態の発光装置１によれば、ハイブリッドレンズ３の第２の入射面３２に光拡散処理が施されているので、白色ＬＥＤ２から各種方向に出射される青白い光乃至黄色みを帯びた光の一部が、第２の入射面３２で拡散され、照射面９で混ざり合う。このため、光拡散処理を施さない場合と比較して照射面９における色ムラを低減することができる。   Thus, according to the light emitting device 1 of the present embodiment, since the light diffusion process is performed on the second incident surface 32 of the hybrid lens 3, pale light or yellowish light emitted from the white LED 2 in various directions. A part of the light having a color is diffused on the second incident surface 32 and mixed on the irradiation surface 9. For this reason, the color nonuniformity in the irradiation surface 9 can be reduced compared with the case where a light-diffusion process is not performed.

次に、本発明の第２の実施形態に係る発光装置について図３及び図４を参照して説明する。本実施形態の発光装置１は、光拡散処理が、第２の入射面３２に施されておらず、反射面３３に施されている点で第１の実施形態と異なる。他の構成は、第１の実施形態と同様である。   Next, a light emitting device according to a second embodiment of the present invention will be described with reference to FIGS. The light emitting device 1 of the present embodiment is different from the first embodiment in that the light diffusion process is not performed on the second incident surface 32 but is performed on the reflecting surface 33. Other configurations are the same as those of the first embodiment.

光拡散処理は、例えば、図４（ａ）に示されるように、反射面３３に酸化チタン等を拡散物質とするアクリル白色塗料を塗布し、塗膜５１を形成することにより行われる。また、図４（ｂ）に示されるように、反射面３３に周期的なプリズム５２を形成することにより、反射面３３に光拡散処理を施してもよく、図４（ｃ）に示されるように、反射面３３に所定曲率を有する凹面５３又は凸面を形成することにより反射面３３に光拡散処理を施すようにしてもよい。なお、ここで、凹面５３又は凸面とは、反射面３３を、光が入射する側から見たときの凹面又は凸面をいう。図４（ｃ）において、凹面５３が形成される前の反射面３３の形状を点線で示している。   For example, as shown in FIG. 4A, the light diffusion treatment is performed by applying an acrylic white paint using titanium oxide or the like as a diffusing material to the reflective surface 33 to form a coating film 51. Further, as shown in FIG. 4B, by forming a periodic prism 52 on the reflecting surface 33, the reflecting surface 33 may be subjected to a light diffusion process, as shown in FIG. 4C. In addition, a light diffusing process may be applied to the reflective surface 33 by forming a concave surface 53 or a convex surface having a predetermined curvature on the reflective surface 33. Here, the concave surface 53 or the convex surface means a concave surface or a convex surface when the reflecting surface 33 is viewed from the light incident side. In FIG.4 (c), the shape of the reflective surface 33 before the concave surface 53 is formed is shown with the dotted line.

上記３つの光拡散処理のうち、高反射率のアクリル白色塗料を用いた光拡散処理が、発光装置１の出射効率を向上させる上で最も好ましい。なお、第１の実施形態のように、第２の入射面３２にアクリル白色塗料を塗布する場合、高い透過率と光拡散性が要求されるが、酸化チタンを拡散物質とするアクリル白色塗料の場合、透過率７０％程度の塗膜４１を得ることが可能である。一方、本実施形態のように、反射面３３にアクリル白色塗料を塗布する場合、高い反射率と光拡散性が要求されるが、酸化チタンを拡散物質とするアクリル白色塗料の場合、反射率９０％以上の塗膜５１を容易に得ることが可能である。   Of the above three light diffusion treatments, the light diffusion treatment using a highly reflective acrylic white paint is most preferable for improving the emission efficiency of the light emitting device 1. As in the first embodiment, when an acrylic white paint is applied to the second incident surface 32, high transmittance and light diffusibility are required, but an acrylic white paint using titanium oxide as a diffusing substance is required. In this case, it is possible to obtain the coating film 41 having a transmittance of about 70%. On the other hand, when an acrylic white paint is applied to the reflecting surface 33 as in the present embodiment, high reflectivity and light diffusibility are required. However, in the case of an acrylic white paint using titanium oxide as a diffusing material, the reflectivity is 90. % Or more of the coating film 51 can be easily obtained.

このような光拡散処理は、反射面３３の全域に亘って施す必要はなく、少なくとも角部３５近傍の領域を含んで施される。角部３５近傍の反射面３３に入射する光は、その他の領域の反射面３３に入射する光と比較して最も黄色みを帯びた光Ｌ３の割合が多い。このため、角部３５近傍の反射面３３に光拡散処理を施すことにより、図３に示すように、黄色みを帯びた光Ｌ３が照射面９において広範囲に到達することになる。このため、例えば、照射面９の中央に到達した黄色みを帯びた光Ｌ３が、照射面９の中央に到達した青白い光Ｌ１等と混ざり合うこととなり、その結果、照射面９における色の変化がなだらかになり光拡散処理を施さない場合と比較して照射面９に色ムラが生じ難くなる。   Such a light diffusion process does not need to be performed over the entire area of the reflection surface 33, and is performed including at least a region near the corner portion 35. The light incident on the reflection surface 33 in the vicinity of the corner 35 has a higher proportion of the light yellowed light L3 than the light incident on the reflection surface 33 in other regions. For this reason, by performing the light diffusion process on the reflection surface 33 in the vicinity of the corner portion 35, the yellowish light L3 reaches a wide range on the irradiation surface 9 as shown in FIG. For this reason, for example, the yellowish light L3 that has reached the center of the irradiation surface 9 is mixed with the pale light L1 that has reached the center of the irradiation surface 9, and as a result, the color of the irradiation surface 9 changes. As a result, the color becomes gentle and color unevenness is less likely to occur on the irradiated surface 9 as compared with the case where the light diffusion treatment is not performed.

このように、本実施形態の発光装置１によれば、ハイブリッドレンズ３の反射面３３に光拡散処理が施されているので、白色ＬＥＤ２から各種方向に出射される青白い光乃至黄色みを帯びた光の一部が、反射面３３で拡散され、照射面９で混ざり合う。このため、光拡散処理を施さない場合と比較して照射面９における色ムラを低減することができる。   As described above, according to the light emitting device 1 of the present embodiment, since the light diffusion process is performed on the reflection surface 33 of the hybrid lens 3, the white LED 2 emits pale light or yellowish light in various directions. A part of the light is diffused on the reflection surface 33 and mixed on the irradiation surface 9. For this reason, the color nonuniformity in the irradiation surface 9 can be reduced compared with the case where a light-diffusion process is not performed.

次に、本発明の第３の実施形態に係る発光装置について図５及び図６を参照して説明する。本実施形態の発光装置１は、光拡散処理が、第２の入射面３２に施されておらず、出射面３４に施されている点で第１の実施形態と異なる。他の構成は、第１の実施形態と同様である。   Next, a light emitting device according to a third embodiment of the present invention will be described with reference to FIGS. The light emitting device 1 of the present embodiment is different from the first embodiment in that the light diffusion process is not performed on the second incident surface 32 but is performed on the emission surface 34. Other configurations are the same as those of the first embodiment.

光拡散処理は、例えば、図６（ａ）に示されるように、出射面３４に酸化チタン等を拡散物質とするアクリル白色塗料を塗布し、塗膜６１を形成することにより行われる。また、図６（ｂ）に示されるように、出射面３４に周期的なプリズム６２を形成することにより、出射面３４に光拡散処理を施してもよく、出射面３４に高透過率、高拡散性の拡散シートを貼り付けることにより出射面３４に光拡散処理を施してもよい。これら光拡散処理のうち、プリズム６２を用いた光拡散処理が、発光装置１の出射効率を向上させる上で最も好ましい。なお、プリズム６２の形状を適宜変化させ、ビーム角を調整することも可能である。   For example, as shown in FIG. 6A, the light diffusion process is performed by applying an acrylic white paint using titanium oxide or the like as a diffusing material to the emission surface 34 to form a coating film 61. In addition, as shown in FIG. 6B, by forming a periodic prism 62 on the exit surface 34, the exit surface 34 may be subjected to a light diffusion process, and the exit surface 34 has a high transmittance and a high transmittance. A light diffusion process may be performed on the emission surface 34 by attaching a diffusive diffusion sheet. Of these light diffusion processes, the light diffusion process using the prism 62 is most preferable for improving the emission efficiency of the light emitting device 1. It is possible to adjust the beam angle by appropriately changing the shape of the prism 62.

出射面３４に光拡散処理を施すことにより、図５に示されるように、出射面３４の各領域に到達した光が拡散されて照射面９において広範囲に到達することになる。このため、例えば、照射面９の中央に到達した黄色みを帯びた光Ｌ３が、照射面９の中央に到達した青白い光Ｌ１等と混ざり合うこととなり、その結果、照射面９における色の変化がなだらかになり光拡散処理を施さない場合と比較して照射面９に色ムラが生じ難くなる。   By performing the light diffusion process on the emission surface 34, the light reaching each region of the emission surface 34 is diffused and reaches a wide range on the irradiation surface 9 as shown in FIG. 5. For this reason, for example, the yellowish light L3 that has reached the center of the irradiation surface 9 is mixed with the pale light L1 that has reached the center of the irradiation surface 9, and as a result, the color of the irradiation surface 9 changes. As a result, the color becomes gentle and color unevenness is less likely to occur on the irradiated surface 9 as compared with the case where the light diffusion treatment is not performed.

このように、本実施形態の発光装置によれば、ハイブリッドレンズ３の出射面３４に光拡散処理が施されているので、白色ＬＥＤ２から各種方向に出射される青白い光乃至黄色みを帯びた光が、出射面３４で拡散され、照射面９で混ざり合う。このため、光拡散処理を施さない場合と比較して照射面９における色ムラを低減することができる。   Thus, according to the light emitting device of the present embodiment, since the light diffusing process is performed on the emission surface 34 of the hybrid lens 3, pale light or yellowish light emitted from the white LED 2 in various directions. Are diffused on the exit surface 34 and mixed on the irradiated surface 9. For this reason, the color nonuniformity in the irradiation surface 9 can be reduced compared with the case where a light-diffusion process is not performed.

次に、本発明の第４の実施形態に係る照明器具について図７を参照して説明する。本実施形態の照明器具７０は、上述した第１の実施形態乃至第３の実施形態のいずれかに係る発光装置１を、口金付きＬＥＤ交換ユニットに使用したものであり、発光装置１に加えて、発光装置１に所定の電力を供給する電源回路５と、不図示のソケットに取り付けられる口金７１とを備えている。   Next, the lighting fixture which concerns on the 4th Embodiment of this invention is demonstrated with reference to FIG. The lighting fixture 70 of the present embodiment uses the light emitting device 1 according to any of the first to third embodiments described above for the LED replacement unit with a base, and in addition to the light emitting device 1. A power supply circuit 5 for supplying predetermined power to the light emitting device 1 and a base 71 attached to a socket (not shown) are provided.

本実施形態の照明器具７０によれば、色ムラが低減された発光装置１を備えるので、高品質の白色光を得ることができ、演色性の高い照明器具を提供することができる。また、口金７１を備えるので、例えば、白熱灯の代替として利用可能であり、白熱灯を用いた照明器具が有する低いエネルギー効率、短寿命等の問題点を改善することができる。   According to the lighting fixture 70 of this embodiment, since the light emitting device 1 with reduced color unevenness is provided, high-quality white light can be obtained, and a lighting fixture with high color rendering properties can be provided. Further, since the base 71 is provided, it can be used as an alternative to an incandescent lamp, for example, and it is possible to improve problems such as low energy efficiency and short life that a lighting fixture using the incandescent lamp has.

次に、本発明の第５の実施形態に係る照明器具について図８を参照して説明する。本実施形態の照明器具８０は、上述した第１の実施形態乃至第３の実施形態のいずれかに係る発光装置１を、アーム付ＬＥＤライトに使用したものであり、例えば、読書灯又はベッドライト等として用いられる。照明器具８０は、発光装置１に加えて、発光装置１に所定の電力を供給する電源回路５と、発光装置１等を移動自在に支持するアーム８とを備えている。アーム８は、複数のパイプ８１と、これらパイプ８１を連結する関節部８２と、連結されたパイプ８１及び関節部８２を回転自在に支持する軸部８３とを備えている。   Next, the lighting fixture which concerns on the 5th Embodiment of this invention is demonstrated with reference to FIG. The lighting fixture 80 of this embodiment uses the light-emitting device 1 according to any of the first to third embodiments described above for an arm-equipped LED light, for example, a reading light or a bedlight. Etc. In addition to the light emitting device 1, the lighting fixture 80 includes a power supply circuit 5 that supplies predetermined power to the light emitting device 1, and an arm 8 that supports the light emitting device 1 and the like so as to be movable. The arm 8 includes a plurality of pipes 81, a joint part 82 that connects the pipes 81, and a shaft part 83 that rotatably supports the connected pipe 81 and the joint part 82.

本実施形態の照明器具８０によっても、色ムラが低減された発光装置１を備えるので、高品質の白色光を得ることができ、演色性の高い照明器具を提供することができる。また、アーム８の関節部８２と軸部８３を回転させることにより発光装置１の位置を容易に変化させることができるので、ユーザは照射位置を自分の好きなように変化させることができる。このため、例えば、照明器具８０をベッドライトに使用した場合において、ベッド等で読書をする際、読書に必要な範囲のみを照射して、ベッドで寝ている他の人等に光が届かないようにすることができる。   Also with the lighting fixture 80 of this embodiment, since the light emitting device 1 with reduced color unevenness is provided, high-quality white light can be obtained, and a lighting fixture with high color rendering properties can be provided. Moreover, since the position of the light-emitting device 1 can be easily changed by rotating the joint part 82 and the shaft part 83 of the arm 8, the user can change the irradiation position as desired. For this reason, for example, when the luminaire 80 is used as a bed light, when reading on the bed or the like, only the area necessary for reading is irradiated and the light does not reach other people sleeping on the bed. Can be.

なお、本発明は上記各種実施形態の構成に限られることなく種々の変形が可能である。例えば、発光装置１を、口金付きＬＥＤ交換ユニットやアーム付ＬＥＤライト以外の照明器具に用いても構わない。   The present invention is not limited to the configurations of the various embodiments described above, and various modifications can be made. For example, you may use the light-emitting device 1 for lighting fixtures other than the LED exchange unit with a nozzle | cap | die, and LED light with an arm.

本発明の第１の実施形態に係る発光装置の断面図。1 is a cross-sectional view of a light emitting device according to a first embodiment of the present invention. （ａ）は同発光装置のハイブリッドレンズの第２の入射面に光拡散用の塗膜を形成した断面図、（ｂ）は同第２の入射面に光拡散用のプリズムを形成した断面図、（ｃ）は同第２の入射面に光拡散用の凹面を形成した断面図。(A) is a sectional view in which a coating film for light diffusion is formed on the second incident surface of the hybrid lens of the light emitting device, and (b) is a sectional view in which a prism for light diffusion is formed on the second incident surface. (C) is sectional drawing which formed the concave surface for light diffusion in the 2nd entrance plane. 本発明の第２の実施形態に係る発光装置の断面図。Sectional drawing of the light-emitting device which concerns on the 2nd Embodiment of this invention. （ａ）は同発光装置のハイブリッドレンズの反射面に光拡散用の塗膜を形成した断面図、（ｂ）は同反射面に光拡散用のプリズムを形成した断面図、（ｃ）は同反射面に光拡散用の凹面を形成した断面図。(A) is a sectional view in which a coating film for light diffusion is formed on the reflecting surface of the hybrid lens of the light emitting device, (b) is a sectional view in which a prism for light diffusion is formed on the reflecting surface, and (c) is the same. Sectional drawing which formed the concave surface for light diffusion in the reflective surface. 本発明の第３の実施形態に係る発光装置の断面図。Sectional drawing of the light-emitting device which concerns on the 3rd Embodiment of this invention. （ａ）は同発光装置のハイブリッドレンズの出射面に光拡散用の塗膜を形成した断面図、（ｂ）は同出射面に光拡散用のプリズムを形成した断面図。(A) is sectional drawing which formed the coating film for light diffusion in the output surface of the hybrid lens of the light-emitting device, (b) is sectional drawing which formed the prism for light diffusion in the output surface. （ａ）は本発明の第４の実施形態に係る照明器具を側面から見た概略図、（ｂ）は同照明器具を正面から見た概略図。(A) is the schematic which looked at the lighting fixture which concerns on the 4th Embodiment of this invention from the side, (b) is the schematic which looked at the lighting fixture from the front. 本発明の第５の実施形態に係る照明器具の概略図。Schematic of the lighting fixture which concerns on the 5th Embodiment of this invention. 従来の白色ＬＥＤの断面図。Sectional drawing of the conventional white LED. 従来の発光装置の断面図。Sectional drawing of the conventional light-emitting device.

符号の説明Explanation of symbols

１ 発光装置
２ 白色ＬＥＤ
３ ハイブリッドレンズ（レンズ）
２１ 青色ＬＥＤ素子
２２ 蛍光体
３０ 凹部
３１ 第１の入射面
３２ 第２の入射面
３３ 反射面
３４ 出射面
７０，８０ 照明器具 1 Light-emitting device 2 White LED
3 Hybrid lens (lens)
21 Blue LED element 22 Phosphor 30 Recessed portion 31 First incident surface 32 Second incident surface 33 Reflective surface 34 Emitting surfaces 70 and 80 Lighting fixture

Claims (4)

青色ＬＥＤ素子と、この青色ＬＥＤ素子から出射された青色光を波長変換する蛍光体とを組み合わせた白色ＬＥＤと、この白色ＬＥＤから出射される光が入射され、該白色ＬＥＤの発光面の前方を取り囲むように凹部が形成されたレンズとを備え、
前記レンズは、
前記白色ＬＥＤの発光面の正面に対向して前記凹部の底面に位置する第１の入射面と、
前記白色ＬＥＤの発光面の斜め前方に対向して前記凹部の側面に位置する第２の入射面と、
前記第２の入射面よりレンズ内部に入射された光を反射する反射面と、
前記第１の入射面よりレンズ内部に入射された光、及び、前記第２の入射面よりレンズ内部に入射され、且つ、前記反射面で反射された光を出射する出射面とを有する発光装置において、
前記第２の入射面に光拡散処理が施されていることを特徴とする発光装置。 A white LED that combines a blue LED element and a phosphor that converts the wavelength of blue light emitted from the blue LED element, and light emitted from the white LED are incident on the front side of the light emitting surface of the white LED. A lens having a recess formed so as to surround it,
The lens is
A first incident surface located on the bottom surface of the recess facing the front surface of the light emitting surface of the white LED;
A second incident surface located on a side surface of the concave portion facing diagonally forward of the light emitting surface of the white LED;
A reflective surface for reflecting light incident on the lens from the second incident surface;
A light emitting device having light incident on the inside of the lens from the first incident surface and an exit surface that emits light incident on the lens from the second incident surface and reflected by the reflecting surface In
A light-emitting device, wherein the second incident surface is subjected to a light diffusion process. 前記光拡散処理が、前記第２の入射面に替えて前記反射面に施されていることを特徴とする請求項１に記載の発光装置。   The light-emitting device according to claim 1, wherein the light diffusion process is performed on the reflecting surface instead of the second incident surface. 前記光拡散処理が、前記第２の入射面に替えて前記出射面に施されていることを特徴とする請求項１に記載の発光装置。   The light-emitting device according to claim 1, wherein the light diffusion process is performed on the emission surface instead of the second incident surface. 請求項１乃至請求項３のいずれかに記載の発光装置を備えたことを特徴とする照明器具。   A lighting apparatus comprising the light-emitting device according to claim 1.
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