JP4357508B2 - Light emitting device, surface light source device, display device, and light flux controlling member - Google Patents

Light emitting device, surface light source device, display device, and light flux controlling member Download PDF

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JP4357508B2
JP4357508B2 JP2006206084A JP2006206084A JP4357508B2 JP 4357508 B2 JP4357508 B2 JP 4357508B2 JP 2006206084 A JP2006206084 A JP 2006206084A JP 2006206084 A JP2006206084 A JP 2006206084A JP 4357508 B2 JP4357508 B2 JP 4357508B2
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昌男 山口
真吾 大川
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Enplas Corp
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Description

本発明は、発光装置、面光源装置、表示装置及び光束制御部材に関し、例えば、液晶表示パネルの背面側から面状に照明するバックライトの光源や室内の一般照明など各種照明として用いられる発光装置、これを使用し、各種照明に用いられる面光源装置、この面光源装置を照明手段として被照明部材と組み合わせて使用する表示装置、及びこれら面光源装置や表示装置を構成する光束制御部材に関するものである。   The present invention relates to a light-emitting device, a surface light source device, a display device, and a light flux controlling member, and for example, a light-emitting device used as various types of illumination such as a backlight light source that illuminates in a planar form from the back side of a liquid crystal display panel , A surface light source device used for various illuminations using the same, a display device using this surface light source device in combination with an illuminated member as an illuminating means, and a light beam control member constituting these surface light source device and display device It is.

従来から、パーソナルコンピュータやテレビジョン等に使用される液晶表示モニタの照明手段として、複数の発光ダイオード（ＬＥＤ）を点光源として使用した面光源装置が知られている。この面光源装置は、液晶表示モニタの液晶表示パネルとほぼ同形状の板状の光束制御部材の裏面側に複数のＬＥＤをマトリックス状に配置し、そのＬＥＤからの光を光束制御部材の裏面側から光束制御部材の内部に入射させ、その光束制御部材の内部に入射した光を光束制御部材の裏面に対向する出射面から出射させて、その出射光によって液晶表示パネルをその背面側から面状に照明できるようになっている。   2. Description of the Related Art Conventionally, a surface light source device using a plurality of light emitting diodes (LEDs) as point light sources is known as illumination means for a liquid crystal display monitor used in personal computers, televisions, and the like. In this surface light source device, a plurality of LEDs are arranged in a matrix on the back surface side of a plate-like light flux control member having substantially the same shape as the liquid crystal display panel of the liquid crystal display monitor, and light from the LEDs is transmitted to the back surface side of the light flux control member. Is incident on the inside of the light flux control member, and the light incident on the light flux control member is emitted from the emission surface facing the back surface of the light flux control member, and the liquid crystal display panel is planarly formed from the back side by the emitted light. Can be lit up.

（第１従来例）
このようなＬＥＤを光源とした面光源装置として、図１２に示すようなものが知られている。この面光源装置１００は、複数のＬＥＤ１０１のそれぞれに一対一で対応するようにマイクロレンズアレイ１０２を配置し、ＬＥＤ１０１からの光をマイクロレンズアレイ１０２を介して平面に垂直な方向（上方）に出射するようになっている（特許文献１参照）。 (First conventional example)
As such a surface light source device using an LED as a light source, the one shown in FIG. 12 is known. In the surface light source device 100, the microlens array 102 is arranged so as to correspond to each of the plurality of LEDs 101 on a one-to-one basis, and the light from the LEDs 101 is emitted through the microlens array 102 in a direction (upward) perpendicular to the plane. (See Patent Document 1).

（第２従来例）
また、ＬＥＤを光源とした発光表示装置として、図１３に示すようなものが知られている。この発光表示装置１０３は、ＬＥＤ１０４からの光を凹レンズ１０５で拡散したのち、その凹レンズ１０５で拡散された光を凸レンズ１０６で集光し、ＬＥＤ１０４の光軸にほぼ平行な方向に光を出射するようになっている（特許文献２参照）。 (Second conventional example)
As a light-emitting display device using an LED as a light source, the one shown in FIG. 13 is known. The light emitting display device 103 diffuses the light from the LED 104 with the concave lens 105, condenses the light diffused with the concave lens 105 with the convex lens 106, and emits the light in a direction substantially parallel to the optical axis of the LED 104. (See Patent Document 2).

（第３従来例）
また、ＬＥＤを光源とした表示装置として、図１４に示すものが知られている。この表示装置１０７は、ＬＥＤ１０８からの光を集光レンズ１１０によって集光して前方に導き、その集光された光を拡散レンズ１１１で拡散するようになっている（特許文献３参照）。 (Third conventional example)
Moreover, what is shown in FIG. 14 is known as a display apparatus which used LED as the light source. The display device 107 condenses the light from the LED 108 by the condensing lens 110 and guides it forward, and diffuses the collected light by the diffusion lens 111 (see Patent Document 3).

（第４従来例）
また、図１５に示す表示装置１２１は、出射面１２２が半球状の光束制御部材１２３をＬＥＤ１２４の出射面側に固着してなるＬＥＤチップ１２５を複数配置し、各ＬＥＤチップ１２５から出射する光を光拡散部材１２６を透過させた後、その光拡散部材１２６を透過した光で被照明部材（例えば、液晶表示パネル）１２７を面状に照明するようになっている。 (Fourth conventional example)
Further, in the display device 121 shown in FIG. 15, a plurality of LED chips 125 formed by fixing a light beam control member 123 having a hemispherical emission surface 122 to the emission surface side of the LED 124 are arranged, and light emitted from each LED chip 125 is emitted. After passing through the light diffusing member 126, the member to be illuminated (for example, a liquid crystal display panel) 127 is illuminated in a planar shape with the light transmitted through the light diffusing member 126.

特開２００２−４９３２６号公報（段落番号００１５及び図４参照）。JP 2002-49326 A (see paragraph number 0015 and FIG. 4). 特開昭５９−２２６３８１号公報（第３頁左上欄第１５行乃至同頁右上欄第２行、第６図参照）。JP 59-226381 (see page 3, upper left column, line 15 to upper right column, second line, FIG. 6). 特開昭６３−６７０２号公報（第２頁右上欄第２０行乃至同頁左下欄第４行、第３図参照）。JP-A-63-6702 (see page 2, upper right column, line 20 to lower left column, line 4, line 3).

しかしながら、第１従来例の面光源装置１００においては、隣り合うＬＥＤ１０１の中間部分であって、マイクロレンズアレイ１０２の形状が不連続になる部分の光の出射量が急激に変化するため、各マイクロレンズアレイ１０２の境目部分の出射光の明暗のばらつきが目立つという問題点が指摘されていた。   However, in the surface light source device 100 of the first conventional example, the amount of light emitted from the portion where the shape of the microlens array 102 is discontinuous, which is an intermediate portion between adjacent LEDs 101, changes rapidly. It has been pointed out that there is a noticeable variation in the brightness of the emitted light at the boundary of the lens array 102.

また、第２従来例の発光表示装置１０３は、凹レンズ１０５を複数連続的に接続して平面状にするようになっておらず、また、凸レンズ１０６を複数連続的に接続して平面状にするようになっていないため、液晶表示パネルのバックライト等として、広い面積の被照明部材に対して均一な面状照明を行うことが困難である。   In the light emitting display device 103 of the second conventional example, a plurality of concave lenses 105 are not continuously connected to be flat, and a plurality of convex lenses 106 are continuously connected to be flat. For this reason, it is difficult to perform uniform planar illumination on a member to be illuminated with a large area as a backlight of a liquid crystal display panel or the like.

また、第３従来例の表示装置１０７は、ＬＥＤ１０８からの光を集光レンズ１１０で集光した後、その集光レンズ１１０で集光されたＬＥＤ１０８からの光を拡散レンズ１１１で拡散するようになっているため、特許文献１の面光源装置１００のような光の明暗の差が目立ち難くなっているものの、隣り合う複数のＬＥＤ１０８からの光同士が混ざり合いにくく、各ＬＥＤ１０８間の発光色のばらつきが目立つという問題点が指摘されていた。   In the display device 107 of the third conventional example, the light from the LED 108 is condensed by the condenser lens 110, and then the light from the LED 108 condensed by the condenser lens 110 is diffused by the diffusion lens 111. Therefore, although the difference in brightness of the light is not noticeable as in the surface light source device 100 of Patent Document 1, the light from the plurality of adjacent LEDs 108 is difficult to mix, and the emission color between the LEDs 108 is There was a problem that the variation was conspicuous.

また、第４従来例の表示装置１２１は、図１０の線Ｄで示すように、各ＬＥＤ１２４に対応するように出現する照明光の輝度のばらつきが波形形状で大きいため、各ＬＥＤ１２４間の照明光に暗部が生じ、均一な面状照明を行うことが困難であった。また、第４従来例の表示装置１２１は、図１０の線Ｂで示すように、各ＬＥＤチップ１２５から出射した光の光量がＬＥＤ１２４の光軸Ｌ近傍に集中する傾向があるため、隣り合う複数のＬＥＤ１２４からの光同士が混ざり合いにくく、各ＬＥＤ１２４間の発光色のばらつきが目立つという問題点が指摘されていた。
Further, as shown by the line D in FIG. 10, the display device 121 of the fourth conventional example has a large variation in luminance of the illumination light that appears to correspond to each LED 124, so that the illumination light between the LEDs 124 As a result, a dark part was generated in the surface, and it was difficult to perform uniform planar illumination. Further, as shown by the line B in FIG. 10, the display device 121 of the fourth conventional example tends to concentrate the amount of light emitted from each LED chip 125 in the vicinity of the optical axis L of the LED 124. It has been pointed out that the light from the LEDs 124 is difficult to mix with each other, and the variation in emission color among the LEDs 124 is conspicuous.

そこで、本発明は、光源として用いられる発光装置、複数のＬＥＤを使用する面光源装置及びこの面光源装置を使用する表示装置において、各ＬＥＤの発光色のばらつきを目立ちにくくし、輝度ムラのない均一な面状照明を可能にすることを目的とする。また、本発明は、１個のＬＥＤを光源として使用するような場合でも、ＬＥＤからの光を効率よく、所望の範囲まで滑らかに拡げることができるようにすることを目的とする。   Accordingly, the present invention makes a light emitting device used as a light source, a surface light source device using a plurality of LEDs, and a display device using this surface light source device less conspicuous in the variation in emission color of each LED, and has no luminance unevenness. The object is to enable uniform surface illumination. Another object of the present invention is to enable light from an LED to be efficiently and smoothly spread to a desired range even when one LED is used as a light source.

請求項１の発明は、発光素子からの光を光束制御部材を介して出射するようになっている発光装置に関するものである。この発光装置において、前記光束制御部材は、前記発光素子を収容する凹みが裏面に形成され、前記発光素子からの光の出射を制御する光制御出射面が外表面に形成されている。また、前記光制御出射面は、（１）前記発光装置の基準光軸近傍で且つ前記基準光軸を中心とする所定範囲に位置する球の一部を切り取ったような凹み形状の第１の出射面と、この第１の出射面の周囲に連続して形成される第２の出射面と、この第２の出射面と前記裏面とを接続する第３の出射面を有し、前記第２の出射面の平面形状が前記第１の出射面を取り囲む中空円板形状に形成され、前記第１の出射面と前記第２の出射面との接続部分が変曲点となっており、（２）前記発光素子から出射した光のうち、少なくともその最大強度の光が出射される方向から出射光の強度が最大強度の半分の値となる光が出射される方向までの角度範囲内に出射される光は、前記光束制御部材に入射して前記光制御出射面の前記第１の出射面、または第２の出射面に到達し、その到達した光と到達点を通り前記発光装置の基準光軸に平行な線とのなす角度θ１と、前記光制御出射面から出射する光の出射角θ５が、前記発光素子から出射される光のうちの前記基準光軸近傍の光を除き、θ５／θ１＞１の関係を満足するとともに、このθ５／θ１の値をθ１の増加にしたがって徐々に小さくなる方向に変化させる形状に形成されており、（３）前記基準光軸から前記第２の出射面と前記第３の出射面との接続点までの角度をδ１とし、前記光束制御部材の拡散度合いを示す係数をαとしたときに、θ１とθ５の関係が、θ１＜δ１の範囲内において、
θ５＝｛１＋（δ１−θ１）×α／δ１｝×θ１
で表すことができるようになっている。 The invention of claim 1 relates to a light emitting device configured to emit light from a light emitting element via a light flux controlling member. In this light emitting device, the light flux controlling member has a recess for housing the light emitting element on the back surface, and a light control emitting surface for controlling light emission from the light emitting element on the outer surface. In addition, the light control exit surface is (1) a first concave-shaped portion obtained by cutting a part of a sphere located in a predetermined range around the reference optical axis of the light emitting device and centered on the reference optical axis. An emission surface, a second emission surface formed continuously around the first emission surface, and a third emission surface connecting the second emission surface and the back surface, 2 is formed in a hollow disc shape surrounding the first emission surface, the connection portion between the first emission surface and the second emission surface is an inflection point, (2) Of the light emitted from the light emitting element, at least within an angle range from the direction in which the light with the maximum intensity is emitted to the direction in which the light with the intensity of the emitted light is half the maximum intensity. The emitted light enters the light flux controlling member and enters the first exit surface of the light control exit surface, or the first The angle θ1 formed between the reached light and the line passing through the arrival point and parallel to the reference optical axis of the light emitting device, and the emission angle θ5 of the light emitted from the light control exit surface are Excepting the light in the vicinity of the reference optical axis out of the light emitted from the light emitting element, the relationship of θ5 / θ1> 1 is satisfied, and the value of θ5 / θ1 is gradually reduced as θ1 increases. (3) An angle from the reference optical axis to the connection point between the second emission surface and the third emission surface is δ1, and indicates the degree of diffusion of the light flux controlling member. When the coefficient is α, the relationship between θ1 and θ5 is within the range of θ1 <δ1.
θ5 = {1+ (δ1−θ1) × α / δ1} × θ1
Can be expressed as

請求項２の発明は、請求項１記載の発明に係る発光装置に関するものである。この発光装置において、前記発光素子を収容する凹みを構成する凹面は、前記発光素子の光出射面に密接していることを特徴としている。 A second aspect of the present invention relates to a light emitting device according to the first aspect of the present invention. In this light-emitting device, a concave surface that forms a recess for housing the light-emitting element is in close contact with the light-emitting surface of the light-emitting element.

請求項３の発明は、請求項１記載の発明に係る発光装置に関するものである。この発光装置において、前記発光素子を収容する凹みを構成する凹面は、前記発光素子の光出射面に隙間をもって係合するようになっている。 A third aspect of the present invention relates to a light emitting device according to the first aspect of the present invention. In this light emitting device, the concave surface constituting the recess for housing the light emitting element is adapted to engage with the light emitting surface of the light emitting element with a gap.

請求項４の発明は、請求項１乃至３のいずれかの発明に係る発光装置に関するものである。この発光装置において、前記光制御出射面は、前記基準光軸近傍の第１の出射面とこの第１の出射面の周囲に位置する第２の出射面とを有し、これら第１の出射面と第２の出射面との接続部分が変曲点となっていることを特徴としている。   The invention of claim 4 relates to a light emitting device according to any one of claims 1 to 3. In this light-emitting device, the light control exit surface has a first exit surface in the vicinity of the reference optical axis and a second exit surface located around the first exit surface, and these first exit surfaces. The connection portion between the surface and the second emission surface is an inflection point.

請求項５の発明は、前記請求項１乃至４のいずれかの発明に係る発光装置と、この発光装置からの光を拡散・透過する光拡散部材と、を備えたことを特徴とする面光源装置に関するものである。   According to a fifth aspect of the present invention, there is provided a surface light source comprising: the light emitting device according to any one of the first to fourth aspects of the present invention; and a light diffusing member that diffuses and transmits light from the light emitting device. It relates to the device.

請求項６の発明は、前記請求項５に記載の面光源装置と、この面光源装置からの光を照射する被照明部材と、を備えたことを特徴とする表示装置に関するものである。   A sixth aspect of the present invention relates to a display device comprising the surface light source device according to the fifth aspect and a member to be illuminated that emits light from the surface light source device.

請求項７の発明は、発光素子からの光を封止部材と光束制御部材を介して出射するようになっている発光装置に関するものである。この発光装置において、前記光束制御部材は、前記封止部材に封止された前記発光素子を収容する凹みが裏面に形成され、前記発光素子からの光の出射を制御する光制御出射面が外表面に形成されている。また、前記光制御出射面は、（１）前記発光装置の基準光軸近傍で且つ前記基準光軸を中心とする所定範囲に位置する球の一部を切り取ったような凹み形状の第１の出射面と、この第１の出射面の周囲に連続して形成される第２の出射面と、この第２の出射面と前記裏面とを接続する第３の出射面を有し、前記第２の出射面の平面形状が前記第１の出射面を取り囲む中空円板形状に形成され、前記第１の出射面と前記第２の出射面との接続部分が変曲点となっており、（２）前記発光素子から出射した光のうち、少なくともその最大強度の光が出射される方向から出射光の強度が最大強度の半分の値となる光が出射される方向までの角度範囲内に出射される光は、前記光束制御部材に入射して前記光制御出射面の前記第１の出射面、または第２の出射面に到達し、その到達した光と到達点を通り前記発光装置の基準光軸に平行な線とのなす角度θ１と、前記光制御出射面から出射する光の出射角θ５が、前記発光素子から出射される光のうちの前記基準光軸近傍の光を除き、θ５／θ１＞１の関係を満足するとともに、このθ５／θ１の値をθ１の増加にしたがって徐々に小さくなる方向に変化させる形状に形成されており、（３）前記基準光軸から前記第２の出射面と前記第３の出射面との接続点までの角度をδ１とし、前記光束制御部材の拡散度合いを示す係数をαとしたときに、θ１とθ５の関係が、θ１＜δ１の範囲内において、
θ５＝｛１＋（δ１−θ１）×α／δ１｝×θ１
で表すことができるようになっている。 The invention of claim 7 relates to a light emitting device configured to emit light from a light emitting element through a sealing member and a light flux controlling member. In this light emitting device, the light flux controlling member has a recess formed on the back surface for accommodating the light emitting element sealed by the sealing member, and a light control emitting surface for controlling light emission from the light emitting element is provided outside. It is formed on the surface. In addition, the light control exit surface is (1) a first concave-shaped portion obtained by cutting a part of a sphere located in a predetermined range around the reference optical axis of the light emitting device and centered on the reference optical axis. An emission surface, a second emission surface formed continuously around the first emission surface, and a third emission surface connecting the second emission surface and the back surface, 2 is formed in a hollow disc shape surrounding the first emission surface, the connection portion between the first emission surface and the second emission surface is an inflection point, (2) Of the light emitted from the light emitting element, at least within an angle range from the direction in which the light with the maximum intensity is emitted to the direction in which the light with the intensity of the emitted light is half the maximum intensity. The emitted light enters the light flux controlling member and enters the first exit surface of the light control exit surface, or the first The angle θ1 formed between the reached light and the line passing through the arrival point and parallel to the reference optical axis of the light emitting device, and the emission angle θ5 of the light emitted from the light control exit surface are Excepting the light in the vicinity of the reference optical axis out of the light emitted from the light emitting element, the relationship of θ5 / θ1> 1 is satisfied, and the value of θ5 / θ1 is gradually reduced as θ1 increases. (3) The angle from the reference optical axis to the connection point between the second emission surface and the third emission surface is δ1, and indicates the degree of diffusion of the light flux controlling member. When the coefficient is α, the relationship between θ1 and θ5 is within the range of θ1 <δ1.
θ5 = {1+ (δ1−θ1) × α / δ1} × θ1
Can be expressed as

請求項８の発明は、請求項７の発明に係る発光装置に関するものである。この発光装置において、前記発光素子を収容する凹みを構成する凹面は、前記封止部材に封止された前記発光素子の光出射面に密接するようになっている。 The invention of claim 8 relates to a light emitting device according to the invention of claim 7. In this light emitting device, the concave surface constituting the recess for housing the light emitting element is in close contact with the light emitting surface of the light emitting element sealed by the sealing member.

請求項９の発明は、請求項７の発明に係る発光装置に関するものである。この発光装置において、前記発光素子を収容する凹みを構成する凹面は、前記封止部材に封止された前記発光素子の光出射面に隙間をもって係合するようになっている。 A ninth aspect of the invention relates to a light emitting device according to the seventh aspect of the invention. In this light emitting device, the concave surface constituting the recess for housing the light emitting element is engaged with the light emitting surface of the light emitting element sealed by the sealing member with a gap.

請求項１０の発明は、前記請求項７乃至９のいずれかの発明に係る発光装置に関するものである。この発光装置において、前記光制御出射面は、前記基準光軸近傍の第１の出射面とこの第１の出射面の周囲に位置する第２の出射面とを有し、これら第１の出射面と第２の出射面との接続部分が変曲点となっていることを特徴としている。   A tenth aspect of the present invention relates to a light emitting device according to any one of the seventh to ninth aspects. In this light-emitting device, the light control exit surface has a first exit surface in the vicinity of the reference optical axis and a second exit surface located around the first exit surface, and these first exit surfaces. The connection portion between the surface and the second emission surface is an inflection point.

請求項１１の発明は、請求項７乃至１０のいずれかの発明に係る発光装置と、この発光装置からの光を拡散・透過する光拡散部材と、を備えたことを特徴とする面光源装置に関するものである。   An eleventh aspect of the invention is a surface light source device comprising: the light emitting device according to any one of the seventh to tenth aspects of the invention; and a light diffusing member that diffuses and transmits light from the light emitting device. It is about.

請求項１２の発明は、前記請求項１１の発明に係る面光源装置と、この面光源装置からの光を照射する被照明部材と、を備えたことを特徴とする表示装置に関するものである。   The invention of claim 12 relates to a display device comprising the surface light source device according to the invention of claim 11 and an illuminated member for irradiating light from the surface light source device.

請求項１３の発明は、発光素子または封止部材に封止された発光素子を収容する凹みが裏面に形成され、前記発光素子からの光の出射を制御する光制御出射面が外表面に形成された光束制御部材に関するものである。この光束制御部材は、前記発光素子と共に発光装置を構成するようになっている。そして、前記光制御出射面は、（１）前記発光装置の基準光軸近傍で且つ前記基準光軸を中心とする所定範囲に位置する球の一部を切り取ったような凹み形状の第１の出射面と、この第１の出射面の周囲に連続して形成される第２の出射面と、この第２の出射面と前記裏面とを接続する第３の出射面を有し、前記第２の出射面の平面形状が前記第１の出射面を取り囲む中空円板形状に形成され、前記第１の出射面と前記第２の出射面との接続部分が変曲点となっており、（２）前記発光素子から出射した光のうち、少なくともその最大強度の光が出射される方向から出射光の強度が最大強度の半分の値となる光が出射される方向までの角度範囲内に出射される光は、前記光束制御部材に入射して前記光制御出射面の前記第１の出射面、または第２の出射面に到達し、その到達した光と到達点を通り前記発光装置の基準光軸に平行な線とのなす角度θ１と、前記光制御出射面から出射する光の出射角θ５が、前記発光素子から出射される光のうちの前記基準光軸近傍の光を除き、θ５／θ１＞１の関係を満足するとともに、このθ５／θ１の値をθ１の増加にしたがって徐々に小さくなる方向に変化させる形状に形成されており、（３）前記基準光軸から前記第２の出射面と前記第３の出射面との接続点までの角度をδ１とし、前記光束制御部材の拡散度合いを示す係数をαとしたときに、θ１とθ５の関係が、θ１＜δ１の範囲内において、
θ５＝｛１＋（δ１−θ１）×α／δ１｝×θ１
で表すことができるようになっている。
According to a thirteenth aspect of the present invention, a recess for housing the light emitting element or the light emitting element sealed by the sealing member is formed on the back surface, and a light control emitting surface for controlling light emission from the light emitting element is formed on the outer surface. The present invention relates to a luminous flux control member. The light flux controlling member constitutes a light emitting device together with the light emitting element. The light control exit surface is (1) a first concave-shaped portion in which a part of a sphere located near a reference optical axis of the light emitting device and within a predetermined range centered on the reference optical axis is cut out. An emission surface, a second emission surface formed continuously around the first emission surface, and a third emission surface connecting the second emission surface and the back surface, 2 is formed in a hollow disc shape surrounding the first emission surface, the connection portion between the first emission surface and the second emission surface is an inflection point, (2) Of the light emitted from the light emitting element, at least within an angle range from the direction in which the light with the maximum intensity is emitted to the direction in which the light with the intensity of the emitted light is half the maximum intensity. The emitted light is incident on the light flux controlling member and the first exit surface of the light control exit surface, or An angle θ1 formed between the reached light and a line passing through the arrival point and parallel to the reference optical axis of the light emitting device, and an emission angle θ5 of the light emitted from the light control exit surface, Excepting the light in the vicinity of the reference optical axis out of the light emitted from the light emitting element, the relationship θ5 / θ1> 1 is satisfied, and the value of θ5 / θ1 is gradually decreased as the value of θ1 increases. (3) The angle from the reference optical axis to the connection point between the second exit surface and the third exit surface is δ1, and the degree of diffusion of the light flux controlling member is When the coefficient shown is α, the relationship between θ1 and θ5 is within the range of θ1 <δ1.
θ5 = {1+ (δ1−θ1) × α / δ1} × θ1
Can be expressed as

本発明によれば、発光素子から発せられた光の光束は、光束制御部材の光制御出射面により、効率的に且つ広範囲に滑らかに拡げることができ、光束制御部材の出射面から広範囲に照明光を出射することができる。したがって、本発明によれば、複数の発光素子を光源として使用する場合、各発光素子からの光が混じり易くなり、各発光素子の発光色にばらつきがあったとしても、光束制御部材を介して出射される各発光素子の発光色のばらつきが目立ちにくくなると共に、出射光輝度も均一化し、高品質の照明が可能になる。   According to the present invention, the luminous flux of light emitted from the light emitting element can be efficiently and smoothly spread over a wide range by the light control emission surface of the luminous flux control member, and illuminated from the emission surface of the luminous flux control member over a wide range. Light can be emitted. Therefore, according to the present invention, when a plurality of light emitting elements are used as a light source, light from each light emitting element is likely to be mixed, and even if there is a variation in the light emission color of each light emitting element, the light flux control member is used. Variations in the emission color of each light emitting element that is emitted are less noticeable and the luminance of the emitted light is made uniform, enabling high quality illumination.

以下、本発明が適用可能な発光素子、面光源装置及び表示装置の最良の実施の形態を図面に基づいて説明する。   DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a light-emitting element, a surface light source device, and a display device to which the invention can be applied will be described with reference to the drawings.

［面光源装置及び表示装置の概略構成］
図１〜図３は、本実施の形態に係る表示装置１及びこの表示装置１を構成する面光源装置２を示すものである。なお、図１は被照明部材（例えば、液晶表示パネル）３等を取り外して示す表示装置１の平面図（面光源装置の平面図）である。また、図２は、表示装置１の概略を示す断面図であり、図１のＸ１−Ｘ１線に沿って切断して示す表示装置１の断面図である。また、図３は、発光素子４の基準光軸Ｌを含む表示装置１の一部断面図であり、光束制御部材５の光制御出射面６の形状を説明するために図２の一部を拡大して示す図である。ここで、基準光軸Ｌとは、発光装置からの立体的な出射光束の中心における光の進行方向をいう。なお、本実施の形態においては、発光素子４の光軸（発光素子４からの立体的な出射光束の中心における光の進行方向）と基準光軸Ｌが一致している場合を例にして説明する。したがって、以下の説明において、基準光軸Ｌを光軸Ｌと言い換えて説明する。 [Schematic configuration of surface light source device and display device]
1 to 3 show a display device 1 according to the present embodiment and a surface light source device 2 constituting the display device 1. FIG. 1 is a plan view of the display device 1 (plan view of the surface light source device) with the member to be illuminated (for example, a liquid crystal display panel) 3 removed. 2 is a cross-sectional view schematically showing the display device 1, and is a cross-sectional view of the display device 1 cut along the line X1-X1 in FIG. FIG. 3 is a partial cross-sectional view of the display device 1 including the reference optical axis L of the light-emitting element 4, and a part of FIG. FIG. Here, the reference optical axis L refers to the traveling direction of light at the center of the three-dimensional outgoing light beam from the light emitting device. In the present embodiment, the case where the optical axis of the light emitting element 4 (the light traveling direction at the center of the three-dimensional emitted light beam from the light emitting element 4) and the reference optical axis L are described as an example. To do. Therefore, in the following description, the reference optical axis L will be described as the optical axis L.

これらの図に示すように、本実施の形態の表示装置１は、平面形状が略矩形形状の光拡散部材７の裏面側にほぼ等間隔に（ピッチＰで）複数配置された点光源としての発光素子４もしくは封止部材９に封止された発光素子４（例えばＬＥＤ１９）と、光拡散部材７の出射面（裏面と反対側の面）側に配置された被照明部材３と、を備えている。なお、本実施の形態においては、発光素子４もしくは封止部材９で封止された発光素子４、光束制御部材５及び光拡散部材７によって面光源装置２が構成されている。また、発光素子４もしくは封止部材９で封止された発光素子４及び光束制御部材５によって発光装置２９が構成されている。   As shown in these drawings, the display device 1 according to the present embodiment is a point light source in which a plurality of planar light sources are arranged at substantially equal intervals (with a pitch P) on the back surface side of a light diffusing member 7 having a substantially rectangular shape. The light emitting element 4 (for example, LED19) sealed by the light emitting element 4 or the sealing member 9, and the to-be-illuminated member 3 arrange | positioned at the radiation | emission surface (surface on the opposite side to a back surface) side of the light-diffusion member 7 are provided. ing. In the present embodiment, the surface light source device 2 is configured by the light emitting element 4 sealed with the light emitting element 4 or the sealing member 9, the light flux controlling member 5, and the light diffusing member 7. The light emitting device 29 is configured by the light emitting element 4 and the light flux controlling member 5 sealed with the light emitting element 4 or the sealing member 9.

［光束制御部材］
（第１態様）
このような表示装置１を構成する光束制御部材５は、図１乃至図３に示すような形状をしており、例えば、ＰＭＭＡ（ポリメタクリル酸メチル）、ＰＣ（ポリカーボネート）、ＥＰ（エポキシ樹脂）等の透明樹脂材料や透明なガラスで形成されている。 [Flux control member]
(First aspect)
The light flux controlling member 5 constituting such a display device 1 has a shape as shown in FIGS. 1 to 3. For example, PMMA (polymethyl methacrylate), PC (polycarbonate), EP (epoxy resin). It is formed of a transparent resin material such as a transparent glass.

この光束制御部材５は、図１に示すように、平面形状が略円形形状である。また、この光束制御部材５は、図４（ａ）のＸ２−Ｘ２線に沿って切断して示す図４（ｂ）のように、裏面側（図４（ｂ）の下面側）に、発光素子４の光出射面８に密着する凹み１０が形成されている。この凹み１０は、図４（ｂ），（ｃ）に示すように、光束制御部材５の裏面側の中心に位置し、発光素子４の半球状の光出射面８に密着するような半球状に形成されている。そして、このような光束制御部材５は、裏面側の平面部１１が発光素子４の取付基板１２に接着固定されると共に、その裏面側の凹み１０が発光素子４の光出射面８に接着固定されるようになっている。   As shown in FIG. 1, the light flux controlling member 5 has a substantially circular planar shape. Further, the light flux controlling member 5 emits light on the back surface side (the lower surface side of FIG. 4B) as shown in FIG. 4B cut along the line X2-X2 of FIG. A recess 10 is formed in close contact with the light emitting surface 8 of the element 4. As shown in FIGS. 4 (b) and 4 (c), the recess 10 is located at the center of the back surface side of the light flux controlling member 5 and is in a hemispherical shape that is in close contact with the hemispherical light emitting surface 8 of the light emitting element 4. Is formed. In such a light flux controlling member 5, the flat portion 11 on the back surface side is bonded and fixed to the mounting substrate 12 of the light emitting element 4, and the recess 10 on the back surface side is bonded and fixed to the light emitting surface 8 of the light emitting element 4. It has come to be.

また、この光束制御部材５は、その外表面側に光制御出射面６が形成されている。この光制御出射面６は、光軸Ｌを中心とする所定範囲に位置する第１の出射面６ａと、この第１の出射面６ａの周囲に連続して形成される第２の出射面６ｂと、からなっている。このうち、第１の出射面６ａは、図４（ｂ）の断面形状に示すように、下に凸の滑らかな曲面形状であり、球の一部を切り取ったような凹み形状になっている。また、第２の出射面６ｂは、図４（ｂ）の断面形状に示すように、第１の出射面６ａに連続して形成される上に凸の滑らかな曲面形状であり、その平面形状が第１の出射面６ａを取り囲む略中空円板形状に形成されている（図４（ａ）参照）。そして、これら第１の出射面６ａと第２の出射面６ｂが滑らかに接続され、その両出射面６ａ，６ｂの接続部分が変曲点Ｐｏになっている。また、光制御出射面６を構成する第２の出射面６ｂの外周側には、図４（ｂ）の断面形状に示すように、第２の出射面６ｂと裏面の平面部１１とを接続する第３の出射面６ｃが形成されている。なお、図４（ｂ）の断面形状では、ほぼ直線状の傾斜面からなる第３の出射面６ｃを示したが、これに限られず、光束制御部材５からの広範囲且つ均一な出射を妨げる形状でなければ曲線でもよい。ここで、光軸Ｌから出射面６ｂと６ｃの接続点Ｐａまでの角度をδ１とし、光軸Ｌから変曲点Ｐｏまでの角度をδ２とする。   The light flux controlling member 5 has a light control emitting surface 6 formed on the outer surface side thereof. The light control exit surface 6 includes a first exit surface 6a located in a predetermined range centered on the optical axis L, and a second exit surface 6b formed continuously around the first exit surface 6a. It consists of. Among these, as shown in the cross-sectional shape of FIG. 4B, the first emission surface 6a has a smooth curved surface shape that protrudes downward, and has a concave shape that is obtained by cutting a part of a sphere. . Further, as shown in the cross-sectional shape of FIG. 4 (b), the second emission surface 6b has a smooth curved surface shape that is continuously formed on the first emission surface 6a and has a planar shape. Is formed in a substantially hollow disk shape surrounding the first emission surface 6a (see FIG. 4A). The first emission surface 6a and the second emission surface 6b are smoothly connected, and the connection portion between the both emission surfaces 6a and 6b is an inflection point Po. Further, as shown in the cross-sectional shape of FIG. 4B, the second emission surface 6b and the flat portion 11 on the back surface are connected to the outer peripheral side of the second emission surface 6b constituting the light control emission surface 6. A third exit surface 6c is formed. In addition, in the cross-sectional shape of FIG.4 (b), although the 3rd output surface 6c which consists of a substantially linear inclined surface was shown, it is not restricted to this, The shape which prevents the wide-range and uniform emission from the light beam control member 5 Otherwise, it may be a curve. Here, an angle from the optical axis L to the connection point Pa between the exit surfaces 6b and 6c is δ1, and an angle from the optical axis L to the inflection point Po is δ2.

このような光束制御部材５の光制御出射面６の詳細を図３に基づき説明する。この図３において、発光素子４の光軸Ｌに直交する水平面を基準面Ｃとすると、発光素子４から出射して光束制御部材５内を伝播した光Ｈが光制御出射面６から出射する位置（図３の断面における光制御出射面６と光Ｈとの交点Ｐｘ）で基準面Ｃに平行に引いた線をＡとする。また、この図３において、発光素子４からの光Ｈが光制御出射面６から出射する位置Ｐｘにおける光制御出射面６の輪郭線に対する接線Ｂと線Ａとのなす角をθ３とする。そして、この図３において、光束制御部材５の内部を伝播した発光素子４からの光Ｈが光束制御部材５の光制御出射面６から出射する出射角（光制御出射面６から出射する光Ｈと光軸Ｌとのなす角）をθ５とする。   Details of the light control exit surface 6 of the light flux controlling member 5 will be described with reference to FIG. In FIG. 3, assuming that a horizontal plane orthogonal to the optical axis L of the light emitting element 4 is a reference plane C, a position where the light H that has been emitted from the light emitting element 4 and propagated in the light flux controlling member 5 is emitted from the light control emitting surface 6. A line drawn parallel to the reference plane C at the intersection Px of the light control exit surface 6 and the light H in the cross section of FIG. In FIG. 3, the angle formed between the tangent line B and the line A with respect to the contour line of the light control exit surface 6 at the position Px where the light H from the light emitting element 4 exits from the light control exit surface 6 is defined as θ3. In FIG. 3, the emission angle at which the light H from the light emitting element 4 propagated through the light beam control member 5 is emitted from the light control emission surface 6 of the light beam control member 5 (light H emitted from the light control emission surface 6). And the optical axis L) is θ5.

この図３に示す光制御出射面６は、発光素子４から出射される光のうちで、少なくとも最大強度の光が出射される方向（光軸Ｌに沿った方向であって、基準面Ｃの法線方向に沿った方向）から最大強度の半分の値となる光が出射される方向までの角度範囲を含む所定の範囲内（図５において、θ１＜δ１の角度範囲内）において、法線（図３における光軸Ｌ）の近傍の光を除き、θ１とθ５の関係が（θ５／θ１）＞１となるように形成されており、このθ５／θ１の値をθ１の増加にしたがって徐々に減少させるような形状に形成されている（図５の曲線１４参照）。なお、図５において、点線で示す線１５は、（θ５／θ１）＝１の線である。ここで、光束制御部材５の拡散度合いの係数をαとすると、θ１＜δ１の範囲内において、θ５は数１のように表すことができ、θ３は数２のように表すことができる。また、上述の法線（図３における光軸Ｌ）の近傍は、例えば、θ１が±５°以内程度とされることが好ましい。   The light control emission surface 6 shown in FIG. 3 is a direction (a direction along the optical axis L, in which the light having the maximum intensity is emitted among the light emitted from the light emitting element 4, Normal direction within a predetermined range (in the angle range of θ1 <δ1 in FIG. 5) including an angle range from a direction along the normal direction) to a direction in which light having a value half the maximum intensity is emitted. Except for light in the vicinity of (optical axis L in FIG. 3), the relationship between θ1 and θ5 is formed such that (θ5 / θ1)> 1, and the value of θ5 / θ1 is gradually increased as θ1 increases. (See curve 14 in FIG. 5). In FIG. 5, a line 15 indicated by a dotted line is a line of (θ5 / θ1) = 1. Here, if the diffusion degree coefficient of the light flux controlling member 5 is α, θ5 can be expressed as Equation 1 and θ3 can be expressed as Equation 2 within the range of θ1 <δ1. Further, in the vicinity of the above-described normal line (optical axis L in FIG. 3), for example, θ1 is preferably set within about ± 5 °.

Figure 0004357508
Figure 0004357508

Figure 0004357508

このようにして求められたθ３は、図６の曲線１６に示すように、光軸Ｌの近傍からθ１＝δ２となるまでは、θ３はθ１の増加とともに徐々に減少し、θ１＞δ２の範囲では、θ３はθ１の増加とともに徐々に増加するようになっている。そして、θ１がδ１に合致すると、θ３＝θ１となる。
Figure 0004357508
As shown by the curve 16 in FIG. 6, θ3 thus obtained gradually decreases as θ1 increases until θ1 = δ2 from the vicinity of the optical axis L, and a range of θ1> δ2. In this case, θ3 gradually increases as θ1 increases. When θ1 matches δ1, θ3 = θ1.

次に、図２及び図３に基づいて、光束制御部材５の光制御出射面６による作用を説明する。これらの図に示すように、発光素子４からの光Ｈは、光束制御部材５の内部を伝播した後、光制御出射面６から外部（空気中）にスネルの法則にしたがって出射することになる。この際、本発明に係る光束制御部材５から出射される発光素子４からの光束は、図１５に示す従来の半球状の光束制御部材１２３から出射される光束に比較し、発光素子４の直上などで局部的に出射されず、照射範囲内に向けて均一に且つ滑らかに拡げて出射させられる。   Next, based on FIG.2 and FIG.3, the effect | action by the light control output surface 6 of the light beam control member 5 is demonstrated. As shown in these drawings, the light H from the light emitting element 4 propagates through the light flux controlling member 5 and then exits from the light control emitting surface 6 to the outside (in the air) according to Snell's law. . At this time, the light beam from the light emitting element 4 emitted from the light beam control member 5 according to the present invention is directly above the light emitting element 4 as compared with the light beam emitted from the conventional hemispherical light beam control member 123 shown in FIG. For example, it is not emitted locally but emitted uniformly and smoothly toward the irradiation range.

（第１態様の実施例）
次に、本発明の第１態様に係る光束制御部材５を用いた発光装置２９の実施例を図１乃至図４を参照しつつ説明する。これらの図に示した光束制御部材５の光制御出射面６は、発光素子４の発光特性（発光素子４からの出射光束の広がり角度であって、特に出射光の強度が最大強度の半分の値の光の出射角）、光束制御部材５の光軸Ｌ方向の厚さｄ（特に、発光素子４の発光部４ａから光制御出射面６までの光軸Ｌ方向の距離ｄ１）、各発光素子４のピッチ間距離ｐ、光束制御部材５の外径寸法Ｄｏ、光制御出射面６から光拡散部材７までの光軸Ｌ方向の距離Ｌ１、光束制御部材５の屈折率ｎ、光束制御部材５の入射面凹部形状（凹み１０を構成する凹面形状）、発光素子４から出射した光が光束制御部材５に入射するまでの間に通過する部材（隙間）の屈折率に応じて、第１の出射面６ａ及び第２の出射面６ｂの形状等が決定されるようになっている。例えば、光束制御部材５は、入射面凹部形状が半球状で、屈折率ｎ＝１．４９の透明樹脂材料で形成されており、Ｌ１＝１３．８９ｍｍ、ｐ＝２４．２５ｍｍ、ｄ＝３．３１ｍｍ、ｄ１＝２．１１ｍｍ、Ｄｏ＝７．８５ｍｍに設定されている。また、光束制御部材５と発光素子４の間は、光束制御部材５と屈折率の等しい材質で構成されている。この光束制御部材５は、第１の出射面６ａと第２の出射面６ｂの接続部分におけるθ１が、θ１＝δ２＝１６°となるように、また、第２の出射面６ｂと第３の出射面６ｃの接続部分におけるθ１が、θ１＝δ１＝８５°となるように形成されている。そして、第３の出射面６ｃは、第２の出射面６ｂの外周端の接線を光軸Ｌの周りに３６０°回転させて形成されるようになっている。ここで、図４（ｂ）において、θ１≦δ２の範囲が第１の出射面６ａの範囲であり、δ２≦θ１≦δ１の範囲が第２の出射面６ｂの範囲であり、δ１≦θ１の範囲が第３の出射面６ｃの範囲である。 (Example of the first aspect)
Next, an embodiment of the light emitting device 29 using the light flux controlling member 5 according to the first aspect of the present invention will be described with reference to FIGS. The light control exit surface 6 of the light beam control member 5 shown in these figures is the light emission characteristic of the light emitting element 4 (the spread angle of the light flux emitted from the light emitting element 4, and in particular the intensity of the emitted light is half the maximum intensity). Value light emission angle), the thickness d of the light flux controlling member 5 in the optical axis L direction (particularly, the distance d1 in the optical axis L direction from the light emitting portion 4a of the light emitting element 4 to the light control emitting surface 6), each light emission The distance p between the pitches of the elements 4, the outer diameter dimension Do of the light beam control member 5, the distance L1 in the optical axis L direction from the light control exit surface 6 to the light diffusion member 7, the refractive index n of the light beam control member 5, the light beam control member 5 according to the refractive index of the member (gap) that passes through the incident surface recess shape (concave surface shape constituting the recess 10) and the light emitted from the light emitting element 4 before entering the light flux controlling member 5. The shapes and the like of the emission surface 6a and the second emission surface 6b are determined. For example, the light flux controlling member 5 is formed of a transparent resin material having a hemispherical incident surface concave shape and a refractive index n = 1.49, L1 = 13.89 mm, p = 24.25 mm, d = 3. 31 mm, d1 = 2.11 mm, and Do = 7.85 mm. Further, the light flux controlling member 5 and the light emitting element 4 are made of a material having the same refractive index as that of the light flux controlling member 5. The light flux controlling member 5 is configured such that θ1 at the connection portion between the first exit surface 6a and the second exit surface 6b is θ1 = δ2 = 16 °, and the second exit surface 6b and the third exit surface 6b. Θ1 at the connection portion of the emission surface 6c is formed to be θ1 = δ1 = 85 °. The third exit surface 6c is formed by rotating the tangent of the outer peripheral end of the second exit surface 6b around the optical axis L by 360 °. Here, in FIG. 4B, the range of θ1 ≦ δ2 is the range of the first emission surface 6a, the range of δ2 ≦ θ1 ≦ δ1 is the range of the second emission surface 6b, and δ1 ≦ θ1 The range is the range of the third emission surface 6c.

なお、本態様において、発光素子４側の封止部材９が透明樹脂又は透明ガラスで形成されている場合には、光束制御部材５の材料も発光素子４の封止部材９側と同様のものが使用される。このようにすれば、発光素子４から出射した光Ｈが光制御出射面６にそのまま到達する。しかしながら、この態様に限定されるものでなく、発光素子４の封止部材９となる材料と光束制御部材５側の材料を、それぞれ屈折率の異なる材料を使用し、材料の屈折率の違いによる光束制御を行うようにしてもよい。   In this embodiment, when the sealing member 9 on the light emitting element 4 side is formed of transparent resin or transparent glass, the material of the light flux controlling member 5 is the same as that on the sealing member 9 side of the light emitting element 4. Is used. In this way, the light H emitted from the light emitting element 4 reaches the light control emission surface 6 as it is. However, the present invention is not limited to this mode, and the material used as the sealing member 9 of the light emitting element 4 and the material on the light flux controlling member 5 side are made of materials having different refractive indexes, and the difference in the refractive index of the materials. You may make it perform light beam control.

（第２態様）
図７は、本発明に係る光束制御部材５を用いた発光装置２９の第２態様を示す図である。この第２態様の光束制御部材５は、発光素子４との係合構造を除き、第１態様の光束制御部材５と同様である。 (Second embodiment)
FIG. 7 is a diagram showing a second mode of the light emitting device 29 using the light flux controlling member 5 according to the present invention. The light flux control member 5 of the second aspect is the same as the light flux control member 5 of the first aspect except for the engagement structure with the light emitting element 4.

すなわち、この第２態様の光束制御部材５は、図７に示すように、ＬＥＤ１９の断面が矩形形状の光出射面１７を有する場合に使用されるものであり、この矩形形状の光出射面１７に密接する矩形形状の凹み１８が裏面側の中央部に形成されている。そして、この光束制御部材５は、裏面側の平面部１１が発光素子４の取付基板１２に接着固定されると共に、その裏面側の凹み１８が発光素子４の光出射面１７に接着固定されるようになっている。このような構成の本態様に係る光束制御部材５は、第１態様の光束制御部材５と同様の作用効果を得ることができる。なお、図７では発光素子４を封止した封止部材９（ＬＥＤ１９）の断面形状が矩形の場合を示したが、これに限られず、ＬＥＤ１９の形状が半球状やその他異形形状でもよい。   That is, the light flux controlling member 5 of the second aspect is used when the cross section of the LED 19 has a rectangular light emitting surface 17 as shown in FIG. 7, and this rectangular light emitting surface 17 is used. A rectangular recess 18 is formed in the central portion on the back side. In the light flux controlling member 5, the flat portion 11 on the back side is bonded and fixed to the mounting substrate 12 of the light emitting element 4, and the recess 18 on the back side is bonded and fixed to the light emitting surface 17 of the light emitting element 4. It is like that. The light flux controlling member 5 according to this aspect having such a configuration can obtain the same effects as the light flux controlling member 5 of the first aspect. 7 shows the case where the cross-sectional shape of the sealing member 9 (LED 19) sealing the light-emitting element 4 is rectangular, the present invention is not limited to this, and the shape of the LED 19 may be a hemispherical shape or other irregular shapes.

（第３態様）
図８は、本発明に係る光束制御部材５の第３態様を示す図である。この第３態様の光束制御部材５は、発光素子４との係合構造を除き、第１態様の光束制御部材５と同様である。 (Third aspect)
FIG. 8 is a view showing a third aspect of the light flux controlling member 5 according to the present invention. The light flux controlling member 5 of the third aspect is the same as the light flux controlling member 5 of the first aspect except for the engagement structure with the light emitting element 4.

すなわち、この第３態様の光束制御部材５は、図８に示すように、発光素子４と隙間をもって係合する半球状の光入射面（凹み２３の凹面）２０が基準面Ｃから図中上方側に形成されており、この半球状の光入射面２０の図中下方側に、発光素子４と隙間をもって係合する円筒状のＬＥＤ収容部２１が形成されている。そして、この光束制御部材５は、発光素子４にキャップを被せるようにして、発光素子４をＬＥＤ収容部２１内の所定位置に収容した後、発光素子４が取り付けられた基板２２上に下面側の平面部１１が接着固定される。   That is, in the light flux controlling member 5 of the third aspect, as shown in FIG. 8, the hemispherical light incident surface (concave surface of the recess 23) 20 that engages with the light emitting element 4 with a gap is upward from the reference surface C in the figure. A cylindrical LED housing portion 21 that is engaged with the light emitting element 4 with a gap is formed on the lower side of the hemispherical light incident surface 20 in the figure. The light flux controlling member 5 covers the light emitting element 4 in a predetermined position in the LED accommodating portion 21 so that the light emitting element 4 is covered with a cap, and then the lower surface side on the substrate 22 to which the light emitting element 4 is attached. The flat portion 11 is bonded and fixed.

このような構成によれば、発光素子４から出射された光Ｈは、空気層を介して光束制御部材５の半球状の光入射面２０から光束制御部材５の内部に入射し、光束制御部材５の内部を伝播した後、光制御出射面６から外部に出射する。このような本態様の光束制御部材５は、空気層と光束制御部材５との屈折率の違い、及び光束制御部材５の入射面凹部形状を考慮して、光制御出射面６による光束制御を行うことで第１態様の光束制御部材５と同様の作用効果を得ることができる。   According to such a configuration, the light H emitted from the light emitting element 4 enters the light flux control member 5 from the hemispherical light incident surface 20 of the light flux control member 5 through the air layer, and the light flux control member. After propagating inside 5, the light exits from the light control exit surface 6. The light beam control member 5 of this embodiment performs the light beam control by the light control exit surface 6 in consideration of the difference in refractive index between the air layer and the light beam control member 5 and the shape of the concave portion of the incident surface of the light beam control member 5. By doing so, it is possible to obtain the same effect as the light flux controlling member 5 of the first aspect.

なお、前述の第２態様及び第３態様は、発光素子４と封止部材９を一体にしたＬＥＤ１９に換えて、発光素子４のみでもよい。また、第１及び第２態様の発光装置２９は、発光素子４、封止部材９及び光束制御部材５より構成される場合を示したが、これに限られず、封止部材９無し、あるいは封止部材９が光束制御部材５を兼ねてもよい。更に、封止部材９と光束制御部材５は、接着されても、接するだけの状態でもよい。   In the second and third aspects described above, only the light emitting element 4 may be used instead of the LED 19 in which the light emitting element 4 and the sealing member 9 are integrated. In addition, the light emitting device 29 according to the first and second modes has been shown to be configured by the light emitting element 4, the sealing member 9, and the light flux controlling member 5. However, the present invention is not limited to this. The stop member 9 may also serve as the light flux control member 5. Further, the sealing member 9 and the light flux controlling member 5 may be bonded or just in contact with each other.

（その他の態様）
なお、上述の第１乃至第３態様の光束制御部材５において、光制御出射面６にシボ面を形成し、光制御出射面６から出射する光を拡散させるようにしてもよい。 (Other aspects)
In the light flux controlling member 5 of the first to third aspects described above, a textured surface may be formed on the light control exit surface 6 to diffuse the light emitted from the light control exit surface 6.

また、上述の第１乃至第３態様の光束制御部材５は、光拡散物質（例えば、シリコーン粒子や酸化チタン）を含む材料で形成するようにしてもよい。   Further, the light flux controlling member 5 of the first to third aspects described above may be formed of a material containing a light diffusing substance (for example, silicone particles or titanium oxide).

［光拡散部材］
図９は、本実施の形態に係る表示装置１の光拡散部材７を示すものである。この図において、（ａ）〜（ｆ）の各光拡散部材７は、光透過性に優れたＰＭＭＡやＰＣ等の樹脂材料によってシート状あるいは平板形状に形成されており、被照明部材（液晶表示パネル、広告表示パネル、標識表示パネル等）３の平面形状とほぼ同様の大きさ（面積）に形成されている。 [Light diffusion member]
FIG. 9 shows the light diffusing member 7 of the display device 1 according to the present embodiment. In this figure, each of the light diffusing members 7 of (a) to (f) is formed in a sheet shape or a flat plate shape by a resin material such as PMMA or PC excellent in light transmittance. Panel, advertisement display panel, sign display panel, etc.) 3 are formed in the same size (area) as the planar shape.

図９（ａ）の光拡散部材７は、シート状母材７ａの表裏両面にエンボス加工或いはビーズコート等の拡散処理を施してあり、シート状母材７ａの表裏両面に微細な凹凸７ｂ，７ｂを形成してある。   The light diffusing member 7 in FIG. 9A is obtained by performing diffusion processing such as embossing or bead coating on both the front and back sides of the sheet-like base material 7a, and fine irregularities 7b and 7b on both the front and back sides of the sheet-like base material 7a. Is formed.

また、図９（ｂ）の光拡散部材７は、シート状母材７ａに拡散材７ｃを混入すると共に、シート状母材７ａの表裏両面にエンボス加工或いはビーズコート等の拡散処理を施して、シート状母材７ａの表裏両面に凹凸７ｂ，７ｂを形成してある。   The light diffusing member 7 in FIG. 9B mixes the diffusing material 7c with the sheet-like base material 7a, and performs diffusion processing such as embossing or bead coating on the front and back surfaces of the sheet-like base material 7a. Concavities and convexities 7b and 7b are formed on both front and back surfaces of the sheet-like base material 7a.

また、図９（ｃ）の光拡散部材７は、シート状母材７ａの光束制御部材５に面する側にエンボス加工或いはビーズコート等の拡散処理を施して凹凸７ｂを形成し、そのエンボス加工或いはビーズコート等の拡散処理を施した面と反対側のシート状母材７ａの表面に紙面の垂直方向に沿って延びるプリズム突起７ｄを多数連続して形成してある。   Further, the light diffusing member 7 of FIG. 9C is formed with unevenness 7b by performing diffusion processing such as embossing or bead coating on the side of the sheet-like base material 7a facing the light flux controlling member 5, and the embossing is performed. Alternatively, a large number of prism protrusions 7d extending in the direction perpendicular to the paper surface are continuously formed on the surface of the sheet-like base material 7a opposite to the surface subjected to diffusion treatment such as bead coating.

また、図９（ｄ）の光拡散部材７は、図９（ｃ）の光拡散部材７のシート状母材７ａに拡散材７ｃを混入した構造を呈しており、図９（ｃ）の光拡散部材７と同様に、シート状母材７ａの光束制御部材５に面する側にエンボス加工或いはビーズコート等の拡散処理を施して凹凸７ｂを形成し、そのエンボス加工或いはビーズコート等の拡散処理を施した面と反対側のシート状母材７ａの表面にプリズム突起７ｄを多数連続して形成してある。   Further, the light diffusing member 7 in FIG. 9D has a structure in which the diffusing material 7c is mixed in the sheet-like base material 7a of the light diffusing member 7 in FIG. 9C, and the light in FIG. Similar to the diffusing member 7, the surface of the sheet-like base material 7 a facing the light flux controlling member 5 is subjected to diffusion processing such as embossing or bead coating to form the unevenness 7 b, and the embossing or diffusion processing such as bead coating is performed. A large number of prism protrusions 7d are continuously formed on the surface of the sheet-like base material 7a opposite to the surface subjected to the above.

なお、図９（ｃ），図９（ｄ）に示すプリズム突起７ｄは、断面形状が略二等辺三角形の突起になるように形成されているが、これに限られず、ほぼ三角形状を呈していればよい。   The prism protrusions 7d shown in FIGS. 9C and 9D are formed so that the cross-sectional shape is a substantially isosceles triangular protrusion, but is not limited to this, and has a substantially triangular shape. Just do it.

また、図９（ｅ）に示すように、光拡散部材７は、シート状母材７ａの出射面側に円錐形状の突起７ｅを複数形成し、この突起７ｅでシート状母材７ａを透過する光を拡散するようにしてもよい。   As shown in FIG. 9 (e), the light diffusing member 7 has a plurality of conical projections 7e formed on the exit surface side of the sheet-like base material 7a, and the projection 7e transmits the sheet-like base material 7a. The light may be diffused.

また、図９（ｆ）に示すように、光拡散部材７は、シート状母材７ａの出射面側に角錐（三角錐，四角錐，六角錐等の角錐）形状の突起７ｆを複数形成し、この突起７ｆでシート状母材７ａを透過する光を拡散するようにしてもよい。   Further, as shown in FIG. 9 (f), the light diffusing member 7 is formed with a plurality of projections 7f having a pyramid shape (triangular pyramid, quadrangular pyramid, hexagonal pyramid, etc.) on the exit surface side of the sheet-like base material 7a. The light passing through the sheet-like base material 7a may be diffused by the projection 7f.

このような構造の光拡散部材７は、光束制御部材５の光制御出射面６から出射した光を透過しながら拡散し、被照明部材３に照射される光を均一化する。   The light diffusing member 7 having such a structure diffuses the light emitted from the light control emitting surface 6 of the light flux controlling member 5 while transmitting it, and makes the light irradiated to the illuminated member 3 uniform.

また、このような光拡散部材７は、被照明部材３の発光素子４側の面に取り付けても良いし、また、被照明部材３とは別に（分離した状態で）、被照明部材３の発光素子４側の面側に配置するようにしてもよい。   Further, such a light diffusing member 7 may be attached to the surface of the illuminated member 3 on the light emitting element 4 side, or separately (in a separated state) from the illuminated member 3. You may make it arrange | position to the surface side at the side of the light emitting element 4. FIG.

［光拡散部材から出射する光の出射光量］
図１０は、本発明が適用される表示装置１の被照明部材３に照射される光の出射光量分布を示す図である。 [Amount of light emitted from the light diffusing member]
FIG. 10 is a diagram showing an emitted light amount distribution of light irradiated on the illuminated member 3 of the display device 1 to which the present invention is applied.

（ＬＥＤ単灯の場合）
この図１０において、線Ａは、本発明の光束制御部材５を使用した場合の出射光量を示しており、１個の光束制御部材５から出射した発光素子４の光が光拡散部材７を透過した後の光量を示している。また、この図１０において、線Ｂは、図１５に示す従来の光束制御部材１２３を使用した場合の出射光量を示しており、１個の光束制御部材１２３から出射したＬＥＤ１２４の光が光拡散部材１２６を透過した後の光量を示している。 (In the case of a single LED)
In FIG. 10, line A indicates the amount of light emitted when the light flux controlling member 5 of the present invention is used, and the light of the light emitting element 4 emitted from one light flux controlling member 5 passes through the light diffusing member 7. It shows the light quantity after. In FIG. 10, line B indicates the amount of light emitted when the conventional light flux controlling member 123 shown in FIG. 15 is used, and the light of the LED 124 emitted from one light flux controlling member 123 is a light diffusing member. The amount of light after passing through 126 is shown.

この図１０に示すように、本発明の光束制御部材５を使用した場合の出射光量（線Ａ）と図１５で示す従来の光束制御部材１２３を使用した場合の出射光量（線Ｂ）とを比較すると、線Ａは光軸Ｌ近傍で急激に立ち上がる線Ｂに比較してなだらかな山形形状を呈しており、線Ａは光軸Ｌ近傍で線Ｂよりも出射光量が少なく、光軸Ｌから離れた位置まで分配される光量が増加（線Ａと線Ｂとの差Δだけ増加）することが分かる。すなわち、本発明の光束制御部材５を使用すると、発光素子４からの光を従来例よりも均一に分布させることができる。   As shown in FIG. 10, the amount of emitted light (line A) when using the light flux controlling member 5 of the present invention and the amount of emitted light (line B) when using the conventional light flux controlling member 123 shown in FIG. In comparison, the line A has a gentle chevron shape compared to the line B that rises rapidly in the vicinity of the optical axis L, and the line A has a smaller amount of emitted light than the line B in the vicinity of the optical axis L. It can be seen that the amount of light distributed to a distant position increases (increases by the difference Δ between the lines A and B). That is, when the light flux controlling member 5 of the present invention is used, the light from the light emitting element 4 can be distributed more uniformly than in the conventional example.

（ＬＥＤ複灯の場合）
また、図１０において、線Ｃは、本発明の光束制御部材５を発光素子４に対応させて複数配置し、これら複数の光束制御部材５から出射した発光素子４からの光が光拡散部材７を透過した後に測定された光量を示している（図１乃至図２参照）。また、図１０において、線Ｄは、図１５に示す従来の光束制御部材１２３をＬＥＤ１２４に対応させて複数配置し、これら複数の光束制御部材１２３から出射したＬＥＤ１２４からの光が光拡散部材１２６を透過した後に測定された光量を示している。 (In the case of LED double light)
In FIG. 10, the line C includes a plurality of light flux controlling members 5 according to the present invention corresponding to the light emitting elements 4, and light emitted from the light emitting elements 4 emitted from the plurality of light flux controlling members 5 is a light diffusing member 7. The amount of light measured after passing through is shown (see FIGS. 1 and 2). In FIG. 10, a line D indicates that a plurality of conventional light flux control members 123 shown in FIG. 15 are arranged corresponding to the LEDs 124, and light emitted from the plurality of light flux control members 123 passes through the light diffusion member 126. The amount of light measured after transmission is shown.

この図１０に示すように、本発明の光束制御部材５を使用した場合の出射光量（線Ｃ）と図１５に示す従来の光束制御部材１２３を使用した場合の出射光量（線Ｄ）とを比較すると、線ＤがＬＥＤ１２４に対応して輝度のばらつきが波形形状に大きく繰り返して出現するのに対し、線Ｃは発光素子４に対応して出現する輝度のばらつきが極めて小さい。これは、図１０のＡ線で示すように、本発明の光束制御部材５を使用すると、発光素子４から発せられた光が光束制御部材５の光制御出射面６から出射する際に、光軸Ｌ近傍の出射光量が抑えられる一方、光軸Ｌから離れた位置の出射光量が増加させられるようになっているため、隣り合う発光素子４からの光が混ざり合い、光拡散部材７を透過した光の光量が光拡散部材７の出射面側において均一化するものと考えられる。   As shown in FIG. 10, the amount of emitted light (line C) when the light flux controlling member 5 of the present invention is used and the amount of emitted light (line D) when the conventional light flux controlling member 123 shown in FIG. In comparison, while the line D appears corresponding to the LED 124 and the luminance variation appears repeatedly in the waveform shape, the line C shows a very small luminance variation corresponding to the light emitting element 4. This is because, as shown by line A in FIG. 10, when the light flux controlling member 5 of the present invention is used, the light emitted from the light emitting element 4 is emitted from the light control emitting surface 6 of the light flux controlling member 5. While the amount of emitted light in the vicinity of the axis L is suppressed, the amount of emitted light at a position away from the optical axis L is increased, so that the light from the adjacent light emitting elements 4 is mixed and transmitted through the light diffusion member 7. It is considered that the amount of the emitted light is made uniform on the exit surface side of the light diffusing member 7.

以上のように、本願発明に係る表示装置１によれば、光束制御部材５の光制御出射面６の作用により、光束制御部材５から出射する光が滑らかに且つ十分に拡がり、周囲の複数の発光素子４から発せられた光と混ざり合い、図１０のＣ線に示すような均一輝度の照明光が得られる。   As described above, according to the display device 1 according to the present invention, the light emitted from the light beam control member 5 spreads smoothly and sufficiently by the action of the light control emission surface 6 of the light beam control member 5, and a plurality of surrounding The light emitted from the light emitting element 4 is mixed, and illumination light with uniform luminance as shown by line C in FIG. 10 is obtained.

また、本願発明の表示装置１は、各ＬＥＤ（例えば、白色発光するＬＥＤ）４の発生する光の色にばらつき（例えば、黄色味を帯びた色の濃淡）があったとしても、複数の発光素子４の光が広く混ざり合うため、発光素子４の発光色のばらつきが目立たなくなり、高品質の照明が可能になる。   In addition, the display device 1 of the present invention has a plurality of light emission even if there is a variation in the color of light generated by each LED (for example, an LED that emits white light) 4 (for example, the shade of yellowish color). Since the light from the element 4 is widely mixed, the variation in the emission color of the light emitting element 4 becomes inconspicuous, and high quality illumination is possible.

［カラー用面光源装置及び表示装置］
図１１は、本発明を適用できるカラー発光用面光源装置２及びこれを備えた表示装置１を示すものである。このうち、図１１（ａ）は、カラー発光用面光源装置２及びこれを備えた表示装置１の平面図を示すものである。また、図１１（ｂ）は、図１１（ａ）のＸ４−Ｘ４線に沿って切断して示す断面図である。 [Color surface light source device and display device]
FIG. 11 shows a color light-emitting surface light source device 2 to which the present invention can be applied and a display device 1 having the same. Among these, FIG. 11A shows a plan view of the color light emitting surface light source device 2 and the display device 1 including the same. Moreover, FIG.11 (b) is sectional drawing cut | disconnected and shown along the X4-X4 line | wire of Fig.11 (a).

この図１１に示すように、Ｒ，Ｇ，Ｂの各色の発光素子４Ｒ，４Ｇ，４Ｂを交互に配置し、これら発光素子４Ｒ，４Ｇ，４Ｂからの光を光束制御部材５の光制御出射面６から出射し、その出射光を光拡散部材７を介して被照明部材３に照射して、カラー照明を可能にしている。   As shown in FIG. 11, the light emitting elements 4R, 4G, 4B of the respective colors R, G, B are alternately arranged, and the light from these light emitting elements 4R, 4G, 4B is sent to the light control exit surface of the light flux controlling member 5 6, and the illuminated member 3 is irradiated with the emitted light through the light diffusing member 7 to enable color illumination.

このような構成によれば、発光素子４Ｒ，４Ｇ，４Ｂの全てを発光させた場合はもちろんのこと、発光素子４Ｒ，４Ｇ，４Ｂのうちのいずれかを単一発光させた場合でも、出射光が隣り合うＬＥＤを越えてさらに遠い距離にあるＬＥＤまで到達し、各ＬＥＤからの光が混ざり合い、輝度が均一化した高品質の照明が可能になる。   According to such a configuration, not only when all of the light emitting elements 4R, 4G, and 4B emit light but also when any one of the light emitting elements 4R, 4G, and 4B emits a single light, the emitted light is emitted. Reaches an LED at a farther distance beyond the adjacent LEDs, and the light from each LED mixes, enabling high-quality illumination with uniform brightness.

なお、本発明の発光装置２９に、第３の出射面６ｃの部分で、２つ以上の発光装置２９を繋ぎ合わせて一体化してもよい。ＬＥＤ１９（あるいは発光素子４）のピッチが短い場合には、面光源装置２とするための組立が容易になる。また、大型の発光装置２９を作製する場合には、１つの発光素子４に使用する光束制御部材５を、あらかじめ複数個のブロックに分割して各ブロックを個々に形成しておき、これらを組み立てることで１つの光束制御部材としてもよい。   It should be noted that two or more light emitting devices 29 may be connected to and integrated with the light emitting device 29 of the present invention at the third emission surface 6c. When the pitch of the LEDs 19 (or the light emitting elements 4) is short, the assembly for making the surface light source device 2 becomes easy. In the case of manufacturing a large light emitting device 29, the light flux controlling member 5 used for one light emitting element 4 is divided into a plurality of blocks in advance, and each block is individually formed and assembled. Thus, a single light flux controlling member may be used.

また、上述の各実施形態の態様は、例えば、図３で例示したように、発光素子４から出射された光の光軸Ｌと法線方向とが一致する構成を示しているが、本願発明は、発光素子４の品質のばらつきや、発光素子４を含む各部品の組立誤差等により、発光素子４から出射される光の光軸Ｌと法線方向とが僅かにズレを生じる場合にも適用でき、上述の各実施形態と同様の作用効果を得ることができる。   Moreover, although the aspect of each above-mentioned embodiment has shown the structure in which the optical axis L and the normal line direction of the light radiate | emitted from the light emitting element 4 correspond, for example, as illustrated in FIG. Even when the optical axis L and the normal direction of the light emitted from the light emitting element 4 are slightly shifted due to variations in the quality of the light emitting element 4 or assembly errors of components including the light emitting element 4. It is applicable, and the same effect as each above-mentioned embodiment can be acquired.

この発明に係る発光装置は、テレビモニターやパーソナルコンピュータのモニターのバックライトに使用したり、室内表示灯や各種照明などの用途に広く使用することができる。   The light emitting device according to the present invention can be used for backlights of monitors of television monitors and personal computers, and can be widely used for applications such as indoor display lamps and various illuminations.

本発明が適用できる面光源装置及びこれを備えた表示装置を示すものであり、被照明部材及び光拡散部材を省略して示す平面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view illustrating a surface light source device to which the present invention can be applied and a display device including the surface light source device, omitting an illuminated member and a light diffusing member. 図１のＸ１−Ｘ１線に沿って切断して示す表示装置の断面図である。It is sectional drawing of the display apparatus cut | disconnected and shown along the X1-X1 line | wire of FIG. ＬＥＤの光軸を含む表示装置の一部断面図であり、図２の一部を拡大して示す図である。It is a partial cross section figure of the display apparatus containing the optical axis of LED, and is a figure which expands and shows a part of FIG. 光束制御部材の第１態様を示す詳細図であり、（ａ）が平面図、（ｂ）が（ａ）のＸ２−Ｘ２線に沿って示す断面図、（ｃ）が光束制御部材とＬＥＤとを分解して示す図である。It is detail drawing which shows the 1st aspect of a light beam control member, (a) is a top view, (b) is sectional drawing shown along the X2-X2 line of (a), (c) is a light beam control member, LED, and It is a figure which decomposes | disassembles and shows. 光束制御部材のＬＥＤ出射角θ１と出射角θ５との関係を示す図である。It is a figure which shows the relationship between LED output angle (theta) 1 and output angle (theta) 5 of a light beam control member. 光束制御部材のＬＥＤ出射角θ１とレンズ面傾斜角θ３との関係を示す図であるIt is a figure which shows the relationship between LED emission angle | corner (theta) 1 of a light beam control member, and lens surface inclination-angle (theta) 3. 本発明の第２態様に係る光束制御部材の詳細図であり、（ａ）が平面図、（ｂ）が（ａ）のＸ３−Ｘ３線に沿って示す断面図、（ｃ）が光束制御部材とＬＥＤとを分解して示す図である。It is detail drawing of the light beam control member which concerns on the 2nd aspect of this invention, (a) is a top view, (b) is sectional drawing shown along the X3-X3 line of (a), (c) is a light beam control member. It is a figure which decomposes | disassembles and shows LED. 本発明の第３態様に係る光束制御部材を使用した表示装置の断面図であり、図２に対応させて示す断面図である。It is sectional drawing of the display apparatus using the light beam control member which concerns on the 3rd aspect of this invention, and is sectional drawing shown corresponding to FIG. 光拡散部材を拡大して示す側面図である。（ａ）は光拡散部材の第１例を示す側面図、（ｂ）は光拡散部材の第２例を示す側面図、（ｃ）は光拡散部材の第３例を示す側面図、（ｄ）は光拡散部材の第４例を示す側面図、（ｅ）は光拡散部材の第５例を示す側面図、（ｆ）は光拡散部材の第６例を示す側面図、（ｇ）は表示装置の一部拡大断面図である。It is a side view which expands and shows a light-diffusion member. (A) is a side view showing a first example of the light diffusing member, (b) is a side view showing a second example of the light diffusing member, (c) is a side view showing a third example of the light diffusing member, (d) ) Is a side view showing the fourth example of the light diffusing member, (e) is a side view showing the fifth example of the light diffusing member, (f) is a side view showing the sixth example of the light diffusing member, and (g) It is a partial expanded sectional view of a display apparatus. 本発明が適用される表示装置の被照明部材に照射される光の出射光量分布を、第４従来例の出射光量分布と比較して示す図である。It is a figure which shows the emitted light quantity distribution of the light irradiated to the to-be-illuminated member of the display apparatus to which this invention is applied compared with the emitted light quantity distribution of a 4th prior art example. 本発明を適用できるカラー発光用面光源装置及びこれを備えた表示装置１を示す図である。（ａ）は、被照明部材を取り除いて示す面光源装置及びこれを備えた表示装置の平面図であり、（ｂ）は、（ａ）のＸ４−Ｘ４線に沿って切断して示す断面図である。It is a figure which shows the surface light source device for color light emission which can apply this invention, and the display apparatus 1 provided with the same. (A) is a top view of the surface light source device which removes and shows a to-be-illuminated member, and a display apparatus provided with the same, (b) is sectional drawing cut | disconnected and shown along the X4-X4 line | wire of (a) It is. 第１従来例を示す模式的構造図である。It is a typical structure figure showing the 1st conventional example. 第２従来例を示す模式的構造図である。It is a typical structure figure showing the 2nd conventional example. 第３従来例を示す模式的構造図である。It is a typical structure figure showing the 3rd conventional example. 第４従来例を示す表示装置の断面図である。It is sectional drawing of the display apparatus which shows a 4th prior art example.

符号の説明Explanation of symbols

１……表示装置、２……面光源装置、３……被照明部材（液晶表示パネル）、４……発光素子、５……光束制御部材、６……光制御出射面、６ａ……第１の出射面、６ｂ……第２の出射面、７……光拡散部材、８，１７……光出射面、９……封止部材、１０，１８、２３……凹み、１９……ＬＥＤ、２０……光入射面（凹面）、２９……発光装置、Ｌ……光軸（基準光軸）、Ｐｏ……変曲点   DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 2 ... Surface light source device, 3 ... Illuminated member (liquid crystal display panel), 4 ... Light emitting element, 5 ... Light flux control member, 6 ... Light-control exit surface, 6a ... No. 1 exit surface, 6b... 2nd exit surface, 7... Light diffusing member, 8, 17 ..light exit surface, 9... Sealing member, 10, 18, 23. , 20: Light incident surface (concave surface), 29: Light emitting device, L: Optical axis (reference optical axis), Po: Inflection point

Claims (13)

発光素子からの光を光束制御部材を介して出射するようになっている発光装置において、
前記光束制御部材は、前記発光素子を収容する凹みが裏面に形成され、前記発光素子からの光の出射を制御する光制御出射面が外表面に形成され、
前記光制御出射面は、
（１）前記発光装置の基準光軸近傍で且つ前記基準光軸を中心とする所定範囲に位置する球の一部を切り取ったような凹み形状の第１の出射面と、この第１の出射面の周囲に連続して形成される第２の出射面と、この第２の出射面と前記裏面とを接続する第３の出射面を有し、前記第２の出射面の平面形状が前記第１の出射面を取り囲む中空円板形状に形成され、前記第１の出射面と前記第２の出射面との接続部分が変曲点となっており、
（２）前記発光素子から出射した光のうち、少なくともその最大強度の光が出射される方向から出射光の強度が最大強度の半分の値となる光が出射される方向までの角度範囲内に出射される光は、前記光束制御部材に入射して前記光制御出射面の前記第１の出射面、または第２の出射面に到達し、その到達した光と到達点を通り前記発光装置の基準光軸に平行な線とのなす角度θ１と、前記光制御出射面から出射する光の出射角θ５が、前記発光素子から出射される光のうちの前記基準光軸近傍の光を除き、θ５／θ１＞１の関係を満足するとともに、このθ５／θ１の値をθ１の増加にしたがって徐々に小さくなる方向に変化させる形状に形成されており、
（３）前記基準光軸から前記第２の出射面と前記第３の出射面との接続点までの角度をδ１とし、前記光束制御部材の拡散度合いを示す係数をαとしたときに、θ１とθ５の関係が、θ１＜δ１の範囲内において、
θ５＝｛１＋（δ１−θ１）×α／δ１｝×θ１
で表すことができる、
ことを特徴とする発光装置。 In a light emitting device adapted to emit light from a light emitting element via a light flux controlling member,
The light flux controlling member has a recess for accommodating the light emitting element formed on the back surface, and a light control emitting surface for controlling light emission from the light emitting element is formed on the outer surface,
The light control exit surface is
(1) A concave-shaped first emission surface obtained by cutting off a part of a sphere located in the vicinity of the reference optical axis of the light emitting device and in a predetermined range centered on the reference optical axis, and the first emission A second emission surface continuously formed around the surface, and a third emission surface connecting the second emission surface and the back surface, and the planar shape of the second emission surface is It is formed in the shape of a hollow disk surrounding the first exit surface, and the connecting portion between the first exit surface and the second exit surface is an inflection point,
(2) Of the light emitted from the light emitting element, at least within an angle range from the direction in which the light with the maximum intensity is emitted to the direction in which the light with the intensity of the emitted light is half the maximum intensity. The emitted light enters the light flux controlling member and reaches the first emission surface or the second emission surface of the light control emission surface, passes through the reached light and the arrival point, and reaches the light emitting device. The angle θ1 formed with a line parallel to the reference optical axis and the emission angle θ5 of the light emitted from the light control emission surface are the light emitted from the light emitting element except for the light in the vicinity of the reference optical axis, In addition to satisfying the relationship of θ5 / θ1> 1, the value of θ5 / θ1 is formed in a shape that gradually decreases as θ1 increases.
(3) When the angle from the reference optical axis to the connection point between the second exit surface and the third exit surface is δ1, and the coefficient indicating the diffusion degree of the light flux controlling member is α, θ1 And θ5 are within the range of θ1 <δ1.
θ5 = {1+ (δ1−θ1) × α / δ1} × θ1
Can be represented by
A light emitting device characterized by that. 前記発光素子を収容する凹みを構成する凹面は、前記発光素子の光出射面に密接していることを特徴とする請求項１記載の発光装置。   The light-emitting device according to claim 1, wherein a concave surface that forms a recess for housing the light-emitting element is in close contact with a light-emitting surface of the light-emitting element. 前記発光素子を収容する凹みを構成する凹面は、前記発光素子の光出射面に隙間をもって係合していることを特徴とする請求項１記載の発光装置。   The light-emitting device according to claim 1, wherein a concave surface that constitutes a recess that houses the light-emitting element is engaged with a light-emitting surface of the light-emitting element with a gap. 前記光制御出射面は、前記基準光軸近傍の第１の出射面とこの第１の出射面の周囲に位置する第２の出射面とを有し、これら第１の出射面と第２の出射面との接続部分が変曲点となっていることを特徴とする請求項１乃至３のいずれかに記載の発光装置。   The light control exit surface has a first exit surface in the vicinity of the reference optical axis and a second exit surface located around the first exit surface, and the first exit surface and the second exit surface. The light emitting device according to claim 1, wherein a connection portion with the emission surface is an inflection point. 前記請求項１乃至４のいずれかに記載の発光装置と、この発光装置からの光を拡散・透過する光拡散部材と、を備えたことを特徴とする面光源装置。   5. A surface light source device comprising: the light-emitting device according to claim 1; and a light diffusion member that diffuses and transmits light from the light-emitting device. 前記請求項５に記載の面光源装置と、この面光源装置からの光を照射する被照明部材と、を備えたことを特徴とする表示装置。   6. A display device comprising: the surface light source device according to claim 5; and a member to be illuminated that emits light from the surface light source device. 発光素子からの光を封止部材と光束制御部材を介して出射するようになっている発光装置において、
前記光束制御部材は、前記発光素子を収容する凹みが裏面に形成され、前記発光素子からの光の出射を制御する光制御出射面が外表面に形成され、
前記光制御出射面は、
（１）前記発光装置の基準光軸近傍で且つ前記基準光軸を中心とする所定範囲に位置する球の一部を切り取ったような凹み形状の第１の出射面と、この第１の出射面の周囲に連続して形成される第２の出射面と、この第２の出射面と前記裏面とを接続する第３の出射面を有し、前記第２の出射面の平面形状が前記第１の出射面を取り囲む中空円板形状に形成され、前記第１の出射面と前記第２の出射面との接続部分が変曲点となっており、
（２）前記発光素子から出射した光のうち、少なくともその最大強度の光が出射される方向から出射光の強度が最大強度の半分の値となる光が出射される方向までの角度範囲内に出射される光は、前記光束制御部材に入射して前記光制御出射面の前記第１の出射面、または第２の出射面に到達し、その到達した光と到達点を通り前記発光装置の基準光軸に平行な線とのなす角度θ１と、前記光制御出射面から出射する光の出射角θ５が、前記発光素子から出射される光のうちの前記基準光軸近傍の光を除き、θ５／θ１＞１の関係を満足するとともに、このθ５／θ１の値をθ１の増加にしたがって徐々に小さくなる方向に変化させる形状に形成されており、
（３）前記基準光軸から前記第２の出射面と前記第３の出射面との接続点までの角度をδ１とし、前記光束制御部材の拡散度合いを示す係数をαとしたときに、θ１とθ５の関係が、θ１＜δ１の範囲内において、
θ５＝｛１＋（δ１−θ１）×α／δ１｝×θ１
で表すことができる、
ことを特徴とする発光装置。 In the light emitting device adapted to emit light from the light emitting element through the sealing member and the light flux controlling member,
The light flux controlling member has a recess for accommodating the light emitting element formed on the back surface, and a light control emitting surface for controlling light emission from the light emitting element is formed on the outer surface,
The light control exit surface is
(1) A concave-shaped first emission surface obtained by cutting off a part of a sphere located in the vicinity of the reference optical axis of the light emitting device and in a predetermined range centered on the reference optical axis, and the first emission A second emission surface continuously formed around the surface, and a third emission surface connecting the second emission surface and the back surface, and the planar shape of the second emission surface is It is formed in the shape of a hollow disk surrounding the first exit surface, and the connecting portion between the first exit surface and the second exit surface is an inflection point,
(2) Of the light emitted from the light emitting element, at least within an angle range from the direction in which the light with the maximum intensity is emitted to the direction in which the light with the intensity of the emitted light is half the maximum intensity. The emitted light enters the light flux controlling member and reaches the first emission surface or the second emission surface of the light control emission surface, passes through the reached light and the arrival point, and reaches the light emitting device. The angle θ1 formed with a line parallel to the reference optical axis and the emission angle θ5 of the light emitted from the light control emission surface are the light emitted from the light emitting element except for the light in the vicinity of the reference optical axis, In addition to satisfying the relationship of θ5 / θ1> 1, the value of θ5 / θ1 is formed in a shape that gradually decreases as θ1 increases.
(3) When the angle from the reference optical axis to the connection point between the second exit surface and the third exit surface is δ1, and the coefficient indicating the diffusion degree of the light flux controlling member is α, θ1 And θ5 are within the range of θ1 <δ1.
θ5 = {1+ (δ1−θ1) × α / δ1} × θ1
Can be represented by
Emitting device comprising a call. 前記発光素子を収容する凹みを構成する凹面は、前記封止部材に封止された前記発光素子の光出射面に密接していることを特徴とする請求項７の発光装置。   The light-emitting device according to claim 7, wherein a concave surface that constitutes a recess that accommodates the light-emitting element is in close contact with a light-emitting surface of the light-emitting element sealed by the sealing member. 前記発光素子を収容する凹みを構成する凹面は、前記封止部材に封止された前記発光素子の光出射面に隙間をもって係合していることを特徴とする請求項７記載の発光装置。   The light-emitting device according to claim 7, wherein a concave surface that constitutes a recess accommodating the light-emitting element is engaged with a light emitting surface of the light-emitting element sealed by the sealing member with a gap. 前記光制御出射面は、前記基準光軸近傍の第１の出射面とこの第１の出射面の周囲に位置する第２の出射面とを有し、これら第１の出射面と第２の出射面との接続部分が変曲点となっていることを特徴とする請求項７乃至９のいずれかに記載の発光装置。   The light control exit surface has a first exit surface in the vicinity of the reference optical axis and a second exit surface located around the first exit surface, and the first exit surface and the second exit surface. The light emitting device according to claim 7, wherein a connection portion with the emission surface is an inflection point. 前記請求項７乃至１０のいずれかに記載の発光装置と、この発光装置からの光を拡散・透過する光拡散部材と、を備えたことを特徴とする面光源装置。   11. A surface light source device comprising: the light emitting device according to claim 7; and a light diffusing member that diffuses and transmits light from the light emitting device. 前記請求項１１に記載の面光源装置と、この面光源装置からの光を照射する被照明部材と、を備えたことを特徴とする表示装置。   12. A display device comprising: the surface light source device according to claim 11; and a member to be illuminated that emits light from the surface light source device. 発光素子または封止部材に封止された発光素子を収容する凹みが裏面に形成され、前記発光素子からの光の出射を制御する光制御出射面が外表面に形成され、前記発光素子と共に発光装置を構成する光束制御部材であって、
前記光制御出射面は、
（１）前記発光装置の基準光軸近傍で且つ前記基準光軸を中心とする所定範囲に位置する球の一部を切り取ったような凹み形状の第１の出射面と、この第１の出射面の周囲に連続して形成される第２の出射面と、この第２の出射面と前記裏面とを接続する第３の出射面を有し、前記第２の出射面の平面形状が前記第１の出射面を取り囲む中空円板形状に形成され、前記第１の出射面と前記第２の出射面との接続部分が変曲点となっており、
（２）前記発光素子から出射した光のうち、少なくともその最大強度の光が出射される方向から出射光の強度が最大強度の半分の値となる光が出射される方向までの角度範囲内に出射される光は、前記光束制御部材に入射して前記光制御出射面の前記第１の出射面、または第２の出射面に到達し、その到達した光と到達点を通り前記発光装置の基準光軸に平行な線とのなす角度θ１と、前記光制御出射面から出射する光の出射角θ５が、前記発光素子から出射される光のうちの前記基準光軸近傍の光を除き、θ５／θ１＞１の関係を満足するとともに、このθ５／θ１の値をθ１の増加にしたがって徐々に小さくなる方向に変化させる形状に形成されており、
（３）前記基準光軸から前記第２の出射面と前記第３の出射面との接続点までの角度をδ１とし、前記光束制御部材の拡散度合いを示す係数をαとしたときに、θ１とθ５の関係が、θ１＜δ１の範囲内において、
θ５＝｛１＋（δ１−θ１）×α／δ１｝×θ１
で表すことができる、
ことを特徴とする光束制御部材。 A recess for accommodating the light emitting element sealed by the light emitting element or the sealing member is formed on the back surface, and a light control emitting surface for controlling light emission from the light emitting element is formed on the outer surface, and the light emitting element emits light together with the light emitting element. A light flux controlling member constituting the apparatus,
The light control exit surface is
(1) A concave-shaped first emission surface obtained by cutting off a part of a sphere located in the vicinity of the reference optical axis of the light emitting device and in a predetermined range centered on the reference optical axis, and the first emission A second emission surface continuously formed around the surface, and a third emission surface connecting the second emission surface and the back surface, and the planar shape of the second emission surface is It is formed in the shape of a hollow disk surrounding the first exit surface, and the connecting portion between the first exit surface and the second exit surface is an inflection point,
(2) Of the light emitted from the light emitting element, at least within an angle range from the direction in which the light with the maximum intensity is emitted to the direction in which the light with the intensity of the emitted light is half the maximum intensity. The emitted light enters the light flux controlling member and reaches the first emission surface or the second emission surface of the light control emission surface, passes through the reached light and the arrival point, and reaches the light emitting device. The angle θ1 formed with a line parallel to the reference optical axis and the emission angle θ5 of the light emitted from the light control emission surface are the light emitted from the light emitting element except for the light in the vicinity of the reference optical axis, In addition to satisfying the relationship of θ5 / θ1> 1, the value of θ5 / θ1 is formed in a shape that gradually decreases as θ1 increases.
(3) When the angle from the reference optical axis to the connection point between the second exit surface and the third exit surface is δ1, and the coefficient indicating the diffusion degree of the light flux controlling member is α, θ1 And θ5 are within the range of θ1 <δ1.
θ5 = {1+ (δ1−θ1) × α / δ1} × θ1
Can be represented by
Light flux controlling member, wherein the this.
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JP2008270144A (en) * 2007-03-22 2008-11-06 Furukawa Electric Co Ltd:The Light box
JP5213383B2 (en) * 2007-08-09 2013-06-19 シャープ株式会社 LIGHT EMITTING DEVICE AND LIGHTING DEVICE EQUIPPED WITH THE SAME
JP5040863B2 (en) * 2008-09-03 2012-10-03 豊田合成株式会社 Semiconductor light emitting device
WO2010119617A1 (en) 2009-04-14 2010-10-21 シャープ株式会社 Planar light source device and display device provided with the planar light source device
JP5380182B2 (en) * 2009-07-03 2014-01-08 パナソニック株式会社 Light emitting device, surface light source, and liquid crystal display device
KR101484662B1 (en) 2009-11-17 2015-01-26 샤프 가부시키가이샤 Surface light-emitting unit and display device provided with the same
JP5899508B2 (en) * 2011-04-28 2016-04-06 パナソニックＩｐマネジメント株式会社 LIGHT EMITTING DEVICE AND LIGHTING DEVICE USING THE SAME
CN104254733B (en) * 2012-03-05 2018-03-27 首尔半导体株式会社 For the short illuminating lens for throwing illumination
CN110969959B (en) * 2018-09-28 2022-06-10 深圳光峰科技股份有限公司 LED display screen

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