JP2018116234A - Luminous flux control member, light-emitting device, surface light source device, and display device - Google Patents
Luminous flux control member, light-emitting device, surface light source device, and display device Download PDFInfo
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Abstract
Description
本発明は、発光素子から出射された光の配光を制御する光束制御部材、当該光束制御部材を有する発光装置、面光源装置および表示装置に関する。 The present invention relates to a light flux control member that controls light distribution of light emitted from a light emitting element, a light emitting device having the light flux control member, a surface light source device, and a display device.
エッジライト方式の面光源装置の光源として、発光ダイオード(以下「LED」ともいう)を使用するものが知られている。このような面光源装置では、LEDから出射された光の配光を制御するために、LEDと棒状の光束制御部材を組み合わせた線状光源体を使用することがある(例えば、特許文献1参照)。 As a light source of an edge light type surface light source device, one using a light emitting diode (hereinafter also referred to as “LED”) is known. In such a surface light source device, in order to control the light distribution of the light emitted from the LED, a linear light source body in which the LED and a rod-shaped light flux controlling member are combined may be used (for example, see Patent Document 1). ).
図9(A)は、特許文献1に記載の面光源素子(面光源装置)110の構成を示す斜視図であり、図9(B)は、その部分拡大平面図である。図9に示されるように、特許文献1に記載の面光源素子110は、線状光源体120と、板状の導光体(導光板)130とを有する。線状光源体120は、導光体130の側面に対向するように配置される。線状光源体120は、複数の発光素子122と、複数の発光素子122から出射された光を制御する透光性樹脂基板(光束制御部材)124とを含む。透光性樹脂基板124の導光体130と対向する面には、複数の発光素子122の光軸上に配置された複数の第1切欠部126と、隣接する発光素子122の光軸の間に配置された第2切欠部128とがそれぞれ形成されている。導光体130は、線状光源体120から出射された光を導光する。導光体130の線状光源体120側の側面131は、線状光源体120側に凸の曲面132と、線状光源体120に対して凹の曲面133とが連続して形成されており、全体として波形に形成されている。 FIG. 9A is a perspective view showing a configuration of a surface light source element (surface light source device) 110 described in Patent Document 1, and FIG. 9B is a partially enlarged plan view thereof. As shown in FIG. 9, the surface light source element 110 described in Patent Document 1 includes a linear light source 120 and a plate-shaped light guide (light guide plate) 130. The linear light source body 120 is disposed so as to face the side surface of the light guide body 130. The linear light source body 120 includes a plurality of light emitting elements 122 and a translucent resin substrate (light flux controlling member) 124 that controls light emitted from the plurality of light emitting elements 122. On the surface of the translucent resin substrate 124 facing the light guide 130, a plurality of first notches 126 arranged on the optical axes of the light emitting elements 122 and the optical axes of the adjacent light emitting elements 122 are arranged. The second notch portion 128 is formed in each. The light guide 130 guides the light emitted from the linear light source body 120. The side surface 131 of the light guide 130 on the linear light source body 120 side is formed by continuously forming a curved surface 132 that is convex toward the linear light source body 120 and a curved surface 133 that is concave with respect to the linear light source body 120. The whole is formed into a waveform.
特許文献1に記載の面光源素子110では、第1切欠部126および第2切欠部128から光が出射される。すなわち、透光性樹脂基板124は、複数の発光点を有する。このとき、発光素子122から出射された光は、第1切欠部126を透過して出射される直接光群Laと、第2切欠部128を透過して出射される間接光群Lbとに分かれる。図9に示されるように、特許文献1に記載の面光源素子110では、直接光群Laと間接光群Lbとの出射パターンが異なる。このため、特許文献1に記載の面光源素子110では、導光体130の側面131の形状を波形に形成することで、導光体30に入射する光の分布を均一にしている。そして、導光体130に入射した光は、導光体130の天面全体から均一に出射される。 In the surface light source element 110 described in Patent Document 1, light is emitted from the first cutout portion 126 and the second cutout portion 128. That is, the translucent resin substrate 124 has a plurality of light emitting points. At this time, the light emitted from the light emitting element 122 is divided into a direct light group La that is transmitted through the first cutout 126 and an indirect light group Lb that is transmitted through the second cutout 128. . As shown in FIG. 9, in the surface light source element 110 described in Patent Document 1, the emission patterns of the direct light group La and the indirect light group Lb are different. For this reason, in the surface light source element 110 described in Patent Document 1, the distribution of light incident on the light guide 30 is made uniform by forming the shape of the side surface 131 of the light guide 130 into a waveform. The light incident on the light guide 130 is uniformly emitted from the entire top surface of the light guide 130.
特許文献1の面光源素子110を製造する組立工程において、複数の発光素子122は電力等を供給するための配線を備えた実装基板上に実装され、さらに発光素子を覆って透光性樹脂基板124を実装基板上に配置し、線状光源体120を組み立てた後に、筐体内において、導光体130の側方に線状光源体120を配置する。このように製造する際に、線状光源体1の透光性樹脂基板124が、薄くて板状であるため不安定であり、実装基板に対して斜めになったり、転倒したりすることがあった。 In the assembly process of manufacturing the surface light source element 110 of Patent Document 1, the plurality of light emitting elements 122 are mounted on a mounting substrate provided with wiring for supplying power and the like, and further cover the light emitting elements to cover the light transmitting resin substrate. After 124 is arranged on the mounting substrate and the linear light source body 120 is assembled, the linear light source body 120 is arranged on the side of the light guide 130 in the housing. When manufacturing in this way, the translucent resin substrate 124 of the linear light source body 1 is unstable because it is thin and plate-shaped, and may be inclined with respect to the mounting substrate or may fall over. there were.
また、発光素子122の発熱対策や透光性樹脂基板124の位置合わせのために、透光性樹脂基板124の光源側端面に柱状の脚部を設け、柱状の脚部の先端を実装基板の接着部と接着して透光性樹脂基板124を固定することがある。透光性樹脂基板124に柱状の脚部を設けた場合は、実装基板の接着部に柱状の脚部を配置することにより、発光素子122と位置合わせすることができ、さらに柱状の脚部によって実装基板と透光性樹脂基板124との間に隙間が設けられ、発光素子122から発生する熱を逃がすことができる。しかし、柱状の脚部で固定した構造は、透光性樹脂基板124がより不安定となり、製造工程において歩留まりの低下をもたらしていた。 Further, in order to prevent heat generation of the light-emitting element 122 and align the translucent resin substrate 124, a columnar leg is provided on the light source side end surface of the translucent resin substrate 124, and the tip of the columnar leg is attached to the mounting substrate. The translucent resin substrate 124 may be fixed by adhering to an adhesive portion. When the columnar legs are provided on the translucent resin substrate 124, the columnar legs can be aligned with the light emitting element 122 by arranging the columnar legs on the bonding portion of the mounting substrate. A gap is provided between the mounting substrate and the translucent resin substrate 124 so that heat generated from the light emitting element 122 can be released. However, the structure fixed by the columnar leg portion makes the translucent resin substrate 124 more unstable, resulting in a decrease in yield in the manufacturing process.
さらに、特許文献1に記載の面光源素子10では、前述したように、直接光群Laと間接光群Lbとの出射パターンが異なることから、導光体130に対して均一に光を入射させるためには、導光体130の側面の形状を特殊な形状にしなければならなかった。 Further, in the surface light source element 10 described in Patent Document 1, as described above, since the emission patterns of the direct light group La and the indirect light group Lb are different, light is uniformly incident on the light guide 130. For this purpose, the shape of the side surface of the light guide 130 has to be a special shape.
そこで、本発明の目的は、柱状の脚を設けた場合であっても安定性の高い光束制御部材を提供することである。さらに、他の目的としては、複数の発光点を有する光束制御部材であって、導光板の形状を特殊な形状にする必要がない程度に各発光点から出射される光の出射パターンを同じにできるとともに、発光素子から出射された光の利用効率を向上させることができる光束制御部材を提供することである。また、本発明の目的は、この光束制御部材を有する発光装置、面光源装置および表示装置を提供することでもある。 Accordingly, an object of the present invention is to provide a light flux controlling member having high stability even when a columnar leg is provided. Furthermore, as another object, a light beam control member having a plurality of light emitting points, and the light emission pattern of light emitted from each light emitting point is made the same so that the shape of the light guide plate does not need to be a special shape. It is possible to provide a light flux controlling member that can improve the utilization efficiency of the light emitted from the light emitting element. Another object of the present invention is to provide a light emitting device, a surface light source device, and a display device having the light flux controlling member.
前述した課題を解決するため、本発明の光束制御部材は、発光素子から出射された光を内部に入射させ、前記発光素子から出射される光の光軸に平行なZ軸方向と直交するX軸方向について光の幅を入射時よりも広げて外部に出射させる光束制御部材であって、前記X軸方向の寸法は、前記Z軸方向と前記X軸方向とに直交するY軸方向の寸法に比べて長く、前記発光素子側に面する底面に、発光素子側に突出した脚部と、発光素子側に突出した転倒防止構造とを有し、前記転倒防止構造の少なくとも一部は、前記Y軸方向について前記脚部よりも外側の位置に配置されていることを特徴とする。 In order to solve the above-described problems, the light flux controlling member according to the present invention allows light emitted from a light emitting element to enter the inside, and is orthogonal to the Z-axis direction parallel to the optical axis of the light emitted from the light emitting element. A light beam control member that expands the width of light in the axial direction and emits the light outside, and the dimension in the X-axis direction is a dimension in the Y-axis direction orthogonal to the Z-axis direction and the X-axis direction. The bottom surface facing the light emitting element side is longer than the leg part protruding to the light emitting element side, and the fall prevention structure protruding to the light emitting element side, and at least a part of the fall prevention structure is It is arrange | positioned in the position outside the said leg part about the Y-axis direction.
また、本発明の他の光束制御部材は、発光素子から出射された光を内部に入射させ、前記発光素子から出射される光の光軸に平行なZ軸方向と直交するX軸方向について光の幅を入射時よりも広げて外部に出射させる光束制御部材であって、前記X軸方向の寸法は、前記Z軸方向と前記X軸方向とに直交するY軸方向の寸法に比べて長く、前記発光素子側に面する底面に、発光素子側に突出した脚部と、発光素子側に突出した転倒防止構造とを有し、前記転倒防止構造の先端の突出高さは、前記脚部の先端の突出高さと同じ又は低いことを特徴とする。 Further, another light flux controlling member of the present invention allows light emitted from the light emitting element to enter the inside, and performs light in the X axis direction orthogonal to the Z axis direction parallel to the optical axis of the light emitted from the light emitting element. A beam control member that widens the width of the light beam and emits it to the outside. The dimension in the X-axis direction is longer than the dimension in the Y-axis direction perpendicular to the Z-axis direction and the X-axis direction. A leg portion protruding to the light emitting element side and a tipping prevention structure protruding to the light emitting element side on the bottom surface facing the light emitting element side, and the protruding height of the tip of the tipping prevention structure is the leg portion It is characterized by being the same as or lower than the protruding height of the tip of.
さらに、上記光束制御部材において、前記光束制御部材は、前記底面と反対側に位置する出射面を有し、前記底面には、前記発光素子から出射された光を内部に入射させる入射部が形成され、前記出射面には、前記光軸方向において前記入射部の反対側に位置し、前記入射部から入射した光の一部を全反射してX軸方向の正側と負側へ光を振り分ける出射面凹部が形成され、前記発光素子から光が出射される方向を前記Z軸の正方向としたとき、前記底面には、前記出射面凹部によって全反射された光が到達する位置の少なくとも一部に、前記X軸方向について外側になるにしたがってZ座標が大きくなるZ座標増大領域が前記X軸方向の正側と負側とに一対形成され、前記転倒防止構造の少なくとも一部は、前記一対のZ座標増大領域の間に配置されていることが好ましい。 Furthermore, in the light flux controlling member, the light flux controlling member has an emission surface located on the opposite side of the bottom surface, and an incident portion for allowing light emitted from the light emitting element to enter the inside is formed on the bottom surface. The light exiting surface is located on the opposite side of the incident portion in the optical axis direction, partially reflects a part of the light incident from the incident portion, and transmits light to the positive side and the negative side in the X-axis direction. When the light emitting surface concave portion to be distributed is formed and the direction in which light is emitted from the light emitting element is the positive direction of the Z axis, at least the position where the light totally reflected by the light emitting surface concave portion reaches the bottom surface In part, a pair of Z coordinate increasing regions in which the Z coordinate increases as it goes outward in the X axis direction is formed on the positive side and the negative side in the X axis direction, and at least a part of the fall prevention structure includes: Between the pair of Z coordinate increasing regions It is preferably arranged.
さらに、上記光束制御部材において、前記転倒防止構造の少なくとも一部は、前記Y軸方向について外側に突出していてもよいし、前記転倒防止構造は、前記Y軸方向に離間して並置されていてもよいし、前記転倒防止構造及び前記脚部は、XY平面と平行な底面の平面部に設けられていてもよい。また、上記光束制御部材において、前記底面に形成された凹部であって、前記発光素子から出射された光の少なくとも一部を内部に入射させる入射面を含む底面凹部を有することが好ましい。 Further, in the light flux controlling member, at least a part of the fall prevention structure may protrude outward in the Y-axis direction, and the fall prevention structure is juxtaposed apart from the Y-axis direction. Alternatively, the fall prevention structure and the leg portion may be provided on a plane portion of a bottom surface parallel to the XY plane. Further, the light flux controlling member preferably has a concave portion formed on the bottom surface and including a bottom concave portion including an incident surface on which at least a part of the light emitted from the light emitting element is incident.
また、本発明の発光装置は、発光素子と、前記底面が前記発光素子と対向し、前記Z軸方向が前記発光素子から出射される光の光軸と平行となるように配置された上記束制御部材と、を有することを特徴とする。さらに、上記発光装置は、前記発光素子を実装する実装基板を有し、前記光束制御部材の前記脚部を前記実装基板に固定してもよく、前記実装基板は、前記脚部が配置される部分に基板凹部を有していてもよく、複数個の前記発光素子及び前記光束制御部材が前記実装基板上にX軸方向に並んで配置されていてもよい。 The light-emitting device of the present invention includes a light-emitting element, and the bundle arranged so that the bottom surface faces the light-emitting element and the Z-axis direction is parallel to an optical axis of light emitted from the light-emitting element. And a control member. Furthermore, the light emitting device may include a mounting substrate on which the light emitting element is mounted, and the leg portion of the light flux controlling member may be fixed to the mounting substrate, and the leg portion is disposed on the mounting substrate. The part may have a substrate recess, and a plurality of the light emitting elements and the light flux controlling member may be arranged side by side in the X-axis direction on the mounting substrate.
また、本発明の面光源装置は、上記発光装置と、前記発光装置からの光を導光させつつ出射させる導光板と、を有する。また、本発明の表示装置は、上記面光源装置と、前記面光源装置からの光が照射される被照明部材と、を有する。また、本発明の電子機器は、上記表示装置を表示部として備えたことを特徴とする。 The surface light source device of the present invention includes the light emitting device and a light guide plate that emits light while guiding light from the light emitting device. Moreover, the display apparatus of this invention has the said surface light source device and the to-be-illuminated member with which the light from the said surface light source device is irradiated. According to another aspect of the invention, an electronic apparatus includes the display device as a display unit.
本発明によれば、光束制御部材を安定して基板に固定することができ、組立工程における歩留まりを向上させることができる。また、複数の発光点を有する光束制御部材であって、導光板の形状を特殊な形状にする必要がない程度に各発光点から出射される光の出射パターンを同じにできるとともに、発光素子から出射された光の利用効率を向上させることができる光束制御部材を提供できる。したがって、本発明によれば、単純な形状の導光板と組み合わせて光の利用効率が高く生産性のよい面光源装置および表示装置を提供できる。 According to the present invention, the light flux controlling member can be stably fixed to the substrate, and the yield in the assembly process can be improved. In addition, the light beam control member having a plurality of light emitting points, the light emission pattern of the light emitted from each light emitting point can be made the same to the extent that the light guide plate does not need to have a special shape, and from the light emitting element. A light flux controlling member that can improve the utilization efficiency of the emitted light can be provided. Therefore, according to the present invention, it is possible to provide a surface light source device and a display device that have high light utilization efficiency and good productivity in combination with a light guide plate having a simple shape.
[第1の実施形態]
図1は本発明の光束制御部材1の第1の実施形態を示す図であり、(A)は平面図、(B)は正面図、(C)は側面図、(D)は底面図、(E)は発光素子2側から見た場合の斜視図である。
[First Embodiment]
FIG. 1 is a view showing a first embodiment of a light flux controlling member 1 of the present invention, (A) is a plan view, (B) is a front view, (C) is a side view, (D) is a bottom view, (E) is a perspective view when viewed from the light emitting element 2 side.
図2は、第1の実施形態の光束制御部材1を使用した本発明の発光装置4を示す図であり、(A)は断面図、(B)は発光素子2近辺の拡大図、(C)は導光板5側から見た場合の斜視図である。本発明の発光装置4は、少なくとも発光素子2及び光束制御部材1を有し、さらに、実装基板3を有していてもよい。図2の発光装置4は、実装基板3上に発光素子2が実装され、発光素子2を覆って光束制御部材1が固定されている。 2A and 2B are views showing a light emitting device 4 of the present invention using the light flux controlling member 1 of the first embodiment, wherein FIG. 2A is a cross-sectional view, FIG. 2B is an enlarged view of the vicinity of the light emitting element 2, and FIG. ) Is a perspective view when viewed from the light guide plate 5 side. The light emitting device 4 of the present invention includes at least the light emitting element 2 and the light flux controlling member 1 and may further include a mounting substrate 3. In the light emitting device 4 of FIG. 2, the light emitting element 2 is mounted on the mounting substrate 3, and the light flux controlling member 1 is fixed so as to cover the light emitting element 2.
図3は、第1の実施形態の光束制御部材1(発光装置4)を使用した本発明の面光源装置6を示す図である。(A)は平面図、(B)は正面図、(C)は側面図、(D)は断面図、(E)は導光板5側から見た場合の斜視図である。本発明の面光源装置6は、少なくとも発光装置4(光束制御部材1及び発光素子2)と導光板5とを有し、さらに、図示していないが、筐体、反射板および光拡散部材を有していてもよい。図3の面光源装置6は、導光板5の長辺側の一側面に一つの発光装置4が配置されている。 FIG. 3 is a diagram showing a surface light source device 6 of the present invention using the light flux controlling member 1 (light emitting device 4) of the first embodiment. (A) is a plan view, (B) is a front view, (C) is a side view, (D) is a cross-sectional view, and (E) is a perspective view when viewed from the light guide plate 5 side. The surface light source device 6 of the present invention has at least a light emitting device 4 (light flux controlling member 1 and light emitting element 2) and a light guide plate 5, and further, although not shown, a casing, a reflecting plate, and a light diffusing member. You may have. In the surface light source device 6 of FIG. 3, one light emitting device 4 is disposed on one side surface of the long side of the light guide plate 5.
本明細書において、発光素子2の光軸OAに沿う軸を「Z軸」とし、Z軸に直交する軸を「X軸」とし、Z軸とX軸とに直交する軸を「Y軸」とし、Z軸(光軸)に平行な方向を「Z軸方向」とし、X軸に平行な方向を「X軸方向」とし、Y軸に平行な方向を「Y軸方向」とする。さらに、「Y軸方向について外側」とは、Y軸方向について、光軸OAを通過するXZ平面からの距離が離れていることを意味し、「X軸方向について外側」とは、X軸方向について、光軸OAを通過するYZ平面からの距離が離れていることを意味し、光軸OAを通過するYZ平面を基準として何れか一方をX軸方向の「正側」としたときに、他方をX軸方向の「負側」とする。また、光束制御部材1の内部に入射した光を「内部入射光」という。また、Z軸方向について、発光素子2側を下、導光板5側を上と呼ぶこともある。 In this specification, the axis along the optical axis OA of the light emitting element 2 is referred to as “Z axis”, the axis orthogonal to the Z axis is referred to as “X axis”, and the axis orthogonal to the Z axis and X axis is referred to as “Y axis”. The direction parallel to the Z-axis (optical axis) is referred to as “Z-axis direction”, the direction parallel to the X-axis is referred to as “X-axis direction”, and the direction parallel to the Y-axis is referred to as “Y-axis direction”. Further, “outside in the Y-axis direction” means that the distance from the XZ plane passing through the optical axis OA is away in the Y-axis direction, and “outside in the X-axis direction” means in the X-axis direction. Means that the distance from the YZ plane passing through the optical axis OA is long, and when either one is set as the “positive side” in the X-axis direction with reference to the YZ plane passing through the optical axis OA, The other is the “negative side” in the X-axis direction. Further, the light incident on the inside of the light flux controlling member 1 is referred to as “internal incident light”. Further, in the Z-axis direction, the light emitting element 2 side may be referred to as the lower side, and the light guide plate 5 side may be referred to as the upper side.
光学制御部材1は、発光素子2から出射された光の配光を制御する所望の波長の光を通過させ得る透光性の部材である。特に、面光源装置6として利用する場合には、光学制御部材1は、発光素子2から出射された光を内部に入射させ、X軸方向について光の幅を広げて外部に出射させる。例えば、光束制御部材1は、1つの発光素子2から出射された光を多点化するように光の配光を制御する。光学制御部材1のY軸方向の寸法は、導光板5の厚さと同程度であることが好ましく、X軸方向の寸法は、Y軸方向の寸法に比べて長く構成される。光束制御部材1の材料は、所望の波長の光を通過させ得るものであれば特に限定されない。たとえば、光束制御部材1の材料は、ポリメタクリル酸メチル(PMMA)やポリカーボネート(PC)、エポキシ樹脂(EP)、シリコーン樹脂などの光透過性樹脂、またはガラスである。 The optical control member 1 is a translucent member capable of passing light having a desired wavelength that controls the light distribution of the light emitted from the light emitting element 2. In particular, when used as the surface light source device 6, the optical control member 1 causes the light emitted from the light emitting element 2 to enter the inside, widens the width of the light in the X-axis direction, and emits the light to the outside. For example, the light flux controlling member 1 controls the light distribution so that light emitted from one light emitting element 2 is multipointed. The dimension of the optical control member 1 in the Y-axis direction is preferably about the same as the thickness of the light guide plate 5, and the dimension in the X-axis direction is longer than the dimension in the Y-axis direction. The material of the light flux controlling member 1 is not particularly limited as long as it can pass light having a desired wavelength. For example, the material of the light flux controlling member 1 is light transmissive resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), epoxy resin (EP), silicone resin, or glass.
光学制御部材1は、図1に示すように、発光素子2側に面する底面11と、底面11とは反対側(導光板5側)に面する出射面12と、一対のY軸方向の側面13とを有しており、底面11には、発光素子2側に突出した脚部14と、発光素子2側に突出した転倒防止構造15とが設けられ、出射面12には、出射面12と光軸とが交わる領域近傍に出射面凹部17が形成されている。さらに、光学制御部材1は、底面11に底面凹部16が形成されていてもよい。 As shown in FIG. 1, the optical control member 1 includes a bottom surface 11 facing the light emitting element 2, a light exit surface 12 facing the side opposite to the bottom surface 11 (light guide plate 5 side), and a pair of Y-axis directions. The bottom surface 11 is provided with a leg portion 14 projecting toward the light emitting element 2 and a toppling prevention structure 15 projecting toward the light emitting element 2, and the exit surface 12 includes the exit surface 12. An exit surface recess 17 is formed in the vicinity of a region where 12 and the optical axis intersect. Further, the optical control member 1 may have a bottom surface recess 16 formed on the bottom surface 11.
底面11は、光学制御部材1の発光素子2側に面しており、その一部において発光素子2から出射された光を光学制御部材1の内部に入射させる。発光素子2から出射された光を入射させる部分を入射部とする。入射部は、発光素子2の配光特性や発光素子2の配置等によって変化するが、少なくとも底面11の光軸と交差する位置を含む。底面11には、脚部14及び転倒防止構造15が設けられるが、脚部14及び転倒防止構造15は、底面11の光学的に影響が少ない領域に形成される。底面11の形状は、発光素子2に対向する位置(本実施形態では底面凹部16の形成位置)からX軸の正側および負側へ延設され、正側および負側の各々に、発光素子2に対向する位置から離れるにしたがってZ座標が大きくなるように形成されるZ座標増大領域(図1では曲面部11b)を有している。このような1対のZ座標増大領域をつなぐ部分の形状は特に限定されず、光軸に垂直な平面(XY平面)であってもよいし、傾斜面であってもよいし、曲面であってもよいし、これらを組み合わせた形状でもよい。前述のZ座標増大領域は、出射面凹部17で全反射された光の少なくとも一部が直接又は出射面12等を介して到達し、出射面12(後述の平面部12a)へ向けて全反射するように形成されており、このような位置に脚部14及び転倒防止構造15を形成することは光学的に大きな影響を与える。したがって、底面11の光学的な影響が少ない領域として、1対のZ座標増大領域の間(例えば平面部11a)が選択される。また、入射部がXY平面と平行な平面部11aの場合、発光素子2から出射した光のうち、出射角(光軸OAからの角度)が大きな光は、底面の平面部11aによって表面反射され易くなるため、光の利用効率を低下させる虞があった。このため、平面部11aの光軸OAを含む中央部分に底面凹部16を設けることが好ましい。底面凹部16の内面は、発光素子2からの出射角が大きな光であっても、内面に対する入射角を小さくすることができ、光学制御部材1の内部に効率よく入射させることが可能であり、底面凹部16の内部に発光素子2を配置した場合は底面凹部16の内面が入射部となる。図1の底面11は、光軸OAを含む中央部分に底面凹部16が形成され、その周囲にXY平面と平行な平面部11aを有し、X軸方向について、平面部11aから連続して外側に凸状の曲面部11bが出射面12まで延びた形状であり、曲面部11bは、X軸方向の側面を兼ねている。この曲面部11bがZ座標増大領域に相当する。なお、光学制御部材1は、底面11と区別可能なX軸方向の側面(例えば、YZ平面に平行な平面)を設けてもよい。 The bottom surface 11 faces the light emitting element 2 side of the optical control member 1, and part of the light is emitted from the light emitting element 2 to enter the inside of the optical control member 1. A portion where the light emitted from the light emitting element 2 is incident is defined as an incident portion. The incident portion varies depending on the light distribution characteristics of the light emitting element 2, the arrangement of the light emitting element 2, and the like, but includes at least a position that intersects the optical axis of the bottom surface 11. The bottom surface 11 is provided with the leg portion 14 and the fall prevention structure 15, but the leg portion 14 and the fall prevention structure 15 are formed in a region where the bottom surface 11 has little optical influence. The shape of the bottom surface 11 is extended from the position facing the light emitting element 2 (in this embodiment, the position where the bottom surface recessed portion 16 is formed) to the positive side and the negative side of the X axis. 2 has a Z coordinate increasing region (curved surface portion 11b in FIG. 1) formed so that the Z coordinate increases as the distance from the position facing 2 increases. The shape of the portion connecting such a pair of Z coordinate increasing regions is not particularly limited, and may be a plane (XY plane) perpendicular to the optical axis, an inclined surface, or a curved surface. Alternatively, the shape may be a combination of these. In the aforementioned Z coordinate increasing region, at least part of the light totally reflected by the exit surface recess 17 arrives directly or via the exit surface 12 or the like, and is totally reflected toward the exit surface 12 (a flat surface portion 12a described later). Thus, forming the leg portion 14 and the fall prevention structure 15 at such a position has a great optical effect. Therefore, a region between the pair of Z coordinate increasing regions (for example, the flat surface portion 11a) is selected as a region where the optical influence of the bottom surface 11 is small. In addition, in the case where the incident portion is the flat portion 11a parallel to the XY plane, light having a large emission angle (angle from the optical axis OA) among the light emitted from the light emitting element 2 is reflected on the surface by the flat portion 11a on the bottom surface. Since it becomes easy, there exists a possibility of reducing the utilization efficiency of light. For this reason, it is preferable to provide the bottom surface recessed part 16 in the center part including the optical axis OA of the plane part 11a. Even if the inner surface of the bottom recess 16 is light having a large emission angle from the light emitting element 2, the incident angle with respect to the inner surface can be reduced and can be efficiently incident on the inside of the optical control member 1. When the light emitting element 2 is disposed inside the bottom recess 16, the inner surface of the bottom recess 16 becomes the incident portion. The bottom surface 11 of FIG. 1 has a bottom surface recess 16 formed in the central portion including the optical axis OA, and has a flat surface portion 11a parallel to the XY plane around it, and is continuously outside the flat surface portion 11a in the X-axis direction. The convex curved surface portion 11b extends to the emission surface 12, and the curved surface portion 11b also serves as a side surface in the X-axis direction. The curved surface portion 11b corresponds to a Z coordinate increasing region. The optical control member 1 may be provided with a side surface in the X-axis direction that can be distinguished from the bottom surface 11 (for example, a plane parallel to the YZ plane).
出射面12は、光学制御部材1の発光素子2とは反対側に面しており、光学制御部材1の内部に入射した光を略Z軸方向に出射する。出射面12の形状は、光軸と交わる領域近傍に出射面凹部17が形成された形状であるが、それ以外の形状は特に限定されず、光軸に垂直な平面(XY平面)であってもよいし、傾斜面であってもよいし、曲面であってもよいし、これらを組み合わせた形状でもよい。図1の出射面12は、XY平面に平行な平面部12aであり、光軸OAを含む中央部分において出射面凹部17が形成された形状である。 The emission surface 12 faces the side of the optical control member 1 opposite to the light emitting element 2 and emits the light incident on the inside of the optical control member 1 in the substantially Z-axis direction. The shape of the exit surface 12 is a shape in which the exit surface recess 17 is formed in the vicinity of the region intersecting the optical axis, but the other shapes are not particularly limited, and are a plane (XY plane) perpendicular to the optical axis. Alternatively, it may be an inclined surface, a curved surface, or a combination of these. 1 is a plane portion 12a parallel to the XY plane, and has a shape in which an exit surface recess 17 is formed in a central portion including the optical axis OA.
Y軸方向の表裏に位置する側面13は、Y軸方向に進む内部入射光を出射面に向けて反射する。側面13の形状は、特に限定されず、Y軸に垂直な平面(XZ平面)であってもよいし、傾斜面であってもよいし、曲面であってもよいし、これらを組み合わせた形状でもよい。図1の側面13は、導光板5側にXZ平面と平行な平面部13aと発光素子2側に傾斜部13bが形成された形状である。傾斜部13bは、Y軸方向に進む内部入射光に対し、傾斜部13bに到達した光を外部に透過してしまうよりも全反射で出射面12へ向かう光の割合を増やす機能があり、発光素子2からの光を有効に利用できる。なお、傾斜部に代えて下向きに凸状の曲面部を設けてもよい。 The side surfaces 13 positioned on the front and back sides in the Y-axis direction reflect internal incident light traveling in the Y-axis direction toward the exit surface. The shape of the side surface 13 is not particularly limited, and may be a plane (XZ plane) perpendicular to the Y axis, an inclined surface, a curved surface, or a combination of these. But you can. The side surface 13 in FIG. 1 has a shape in which a planar portion 13a parallel to the XZ plane is formed on the light guide plate 5 side and an inclined portion 13b is formed on the light emitting element 2 side. The inclined portion 13b has a function of increasing the proportion of light traveling toward the exit surface 12 with total reflection rather than transmitting the light reaching the inclined portion 13b to the outside with respect to the internally incident light traveling in the Y-axis direction. The light from the element 2 can be used effectively. Instead of the inclined portion, a downwardly convex curved surface portion may be provided.
脚部14は、光学制御部材1を実装基板3に固定するためのものであり、光学制御部材1の底面11から光学素子2側に突出して設けられている。脚部14は、通常、光学制御部材1と同じ材質で光学制御部材1と一体に形成され、内部入射光が脚部14内に入射すると、脚部14の側面から出射したり、出射面12から出射する光の配光を乱したりするため、底面11において、光学的な影響が少ない領域に形成される。脚部14を実装基板3に固定する方法は特に限定されるものではないが、例えば、脚部14の先端と実装基板3の表面とを接着剤で接着してもよいし、実装基板3の表面に脚部14の先端と嵌合させる構造を設け機械的に固定してもよい。脚部14の先端までの突出高さ(底面11の平面部11aから先端までの長さ)は、光学制御部材1と実装基板3との隙間の幅と相関しており、平面部11aに形成された脚部14を実装基板3の表面3aに固定した場合は、脚部14の突出高さが隙間の幅と一致し、実装基板3に形成された基板凹部31において脚部14を固定した場合は、突出高さと基板凹部31の深さの差が隙間の幅となる。図1の脚部14は、一対の円柱状であり、底面11の平面部11aにおいて円柱の中心がX軸と重なるように、X軸方向について光軸を中心として対称の位置に設けられている。 The leg portion 14 is for fixing the optical control member 1 to the mounting substrate 3, and is provided so as to protrude from the bottom surface 11 of the optical control member 1 to the optical element 2 side. The leg portion 14 is usually formed of the same material as the optical control member 1 and is integrally formed with the optical control member 1. When the internal incident light enters the leg portion 14, the leg portion 14 is emitted from the side surface of the leg portion 14 or the emission surface 12. In order to disturb the light distribution of the light emitted from the bottom surface 11, the bottom surface 11 is formed in a region having little optical influence. The method for fixing the leg portion 14 to the mounting substrate 3 is not particularly limited. For example, the tip of the leg portion 14 and the surface of the mounting substrate 3 may be bonded with an adhesive, A structure for fitting the tip of the leg portion 14 on the surface may be provided and mechanically fixed. The protruding height to the tip of the leg part 14 (the length from the flat part 11a to the tip of the bottom surface 11) correlates with the width of the gap between the optical control member 1 and the mounting board 3, and is formed on the flat part 11a. When the formed leg portion 14 is fixed to the surface 3 a of the mounting substrate 3, the protruding height of the leg portion 14 matches the width of the gap, and the leg portion 14 is fixed in the substrate recess 31 formed in the mounting substrate 3. In this case, the difference between the protruding height and the depth of the substrate recess 31 is the width of the gap. The leg part 14 of FIG. 1 is a pair of columnar shape, and is provided in the X-axis direction in the symmetrical position centering on an optical axis so that the center of a cylinder may overlap with an X-axis in the plane part 11a of the bottom face 11. .
転倒防止構造15は、光学制御部材1を実装基板3に固定した後、光学制御部材1が傾いたり、転倒したりするのを防止するための機能を有し、光学制御部材1の底面11から光学素子2側に突出して設けられている。転倒防止構造15も、光学制御部材1と同じ材質で光学制御部材1と一体に形成され、内部入射光が転倒防止構造15内に入射すると、転倒防止構造15脚の側面から出射したり、出射面12から出射する光の配光を乱したりするため、底面11において、光学的な影響が少ない領域に形成される。転倒防止構造15の数は特に限定されるものではないが、X軸方向において光軸を中心として対称に設けることが好ましいので、偶数とすることが好ましい。 The fall prevention structure 15 has a function for preventing the optical control member 1 from tilting or falling after the optical control member 1 is fixed to the mounting substrate 3. Projecting toward the optical element 2 side. The fall prevention structure 15 is also formed integrally with the optical control member 1 with the same material as the optical control member 1. When the internal incident light enters the fall prevention structure 15, the fall prevention structure 15 emits from the side surface of the fall prevention structure 15. In order to disturb the light distribution of the light emitted from the surface 12, the bottom surface 11 is formed in a region having little optical influence. The number of the fall prevention structures 15 is not particularly limited, but it is preferable that the number of the fall prevention structures 15 be an even number since it is preferably provided symmetrically about the optical axis in the X-axis direction.
また、転倒防止構造15は、少なくとも一部をY軸方向について脚部14よりも外側の位置に配置することにより、光学制御部材1がY軸方向に傾くのを転倒防止構造15が支持できるため転倒防止機能を高めることができる。さらに、脚部14の先端は実装基板3の表面と接触して固定する必要があるが、転倒防止構造15の先端は転倒や傾きに対して支えとなればよいので、必ずしも実装基板3の表面に接触しなくてもよいし、実装基板3の表面に固定(例えば接着)しなくてもよい。このため、転倒防止構造15の先端の突出高さ(底面11の平面部31aから先端までの長さ)は、脚部14の先端の突出高さと同じ又は低いことが好ましい。特に、実装基板3に基板凹部31を設け、基板凹部31において脚部14を固定する場合は、脚部14の先端の突出高さのほうが、転倒防止構造15の先端の突出高さよりも高くする必要がある。 Moreover, since the fall prevention structure 15 can support the tilting of the optical control member 1 in the Y axis direction by arranging at least a part of the fall prevention structure 15 at a position outside the leg portion 14 in the Y axis direction. The fall prevention function can be enhanced. Further, the tip of the leg portion 14 needs to be fixed in contact with the surface of the mounting substrate 3, but the tip of the fall prevention structure 15 only needs to support the tipping or tilting, so that the surface of the mounting substrate 3 is not necessarily required. May not be in contact with each other, and may not be fixed (for example, adhered) to the surface of the mounting substrate 3. For this reason, it is preferable that the protruding height of the tip of the fall prevention structure 15 (the length from the flat portion 31a of the bottom surface 11 to the tip) is the same as or lower than the protruding height of the tip of the leg portion 14. In particular, when the substrate recess 31 is provided in the mounting substrate 3 and the leg 14 is fixed in the substrate recess 31, the protruding height of the tip of the leg 14 is higher than the protruding height of the tip of the fall prevention structure 15. There is a need.
図1の転倒防止構造15は、一対の四角柱状であり、X軸方向について光軸を中心として対称の位置であって、脚部よりも外側の位置に配置されている。転倒防止構造15のY軸方向の寸法は、光学制御部材1のY軸方向の側面13の平面部13a間と同じ幅であり、転倒防止構造15のY軸方向の側面近傍の部分は脚部14よりもY軸方向について外側に位置している。なお、後述する第2の実施形態(図5)のように、転倒防止構造の少なくとも一部が、Y軸方向について外側に突出してもよい。また、図1の転倒防止構造15の先端の突出高さは、脚部14の先端の突出高さよりもわずかに低く、図2に示すように、脚部14の先端が実装基板3の基板凹部31に接しているときに、転倒防止構造15の先端が実装基板3の表面に接触するように、基板凹部31の深さ分低くなっている。 The fall prevention structure 15 shown in FIG. 1 has a pair of quadrangular prisms, and is disposed at a position that is symmetrical about the optical axis in the X-axis direction and that is outside the legs. The dimension of the fall prevention structure 15 in the Y-axis direction is the same width as that between the flat portions 13a of the side surface 13 in the Y-axis direction of the optical control member 1, and the portion in the vicinity of the side surface in the Y-axis direction of the fall prevention structure 15 is a leg portion. 14 is located outside in the Y axis direction. Note that, as in a second embodiment (FIG. 5) described later, at least a part of the fall prevention structure may protrude outward in the Y-axis direction. 1 is slightly lower than the protrusion height of the tip end of the leg portion 14, and the tip end of the leg portion 14 is the substrate recess of the mounting substrate 3, as shown in FIG. The depth of the substrate recess 31 is lowered so that the tip of the fall prevention structure 15 is in contact with the surface of the mounting substrate 3 when in contact with 31.
底面11において、光学的な影響が少ない領域は、光束制御部材1の内部入射光の伝搬機構によっても異なるが、光学素子2から出射した光(光軸に対する角度が90度に近い光)が光束制御部材1の内部に入射し、内部入射光として脚部14及び転倒防止構造15に入射しにくいような領域であり、例えば、図1においては、Z座標増大領域の間に配置された平面部11aに脚部14及び転倒防止構造15を設けることが好ましい。また、内部入射光が出射面12等に反射することで、下向きに進む場合があるが、かかる下向きの内部入射光の少ない領域とすることがさらに好ましい。発光素子2から出射した全光量を100%とした場合に、その領域に到達する光量が7%以下となる領域は、内部入射光の少ない領域といえる。図1の光束制御部材1について出射面12に出射した光量と、底面11の平面部11aに入射した光量とをシミュレーションした結果、発光素子2の全光量を100%とすると、出射面12に出射した光量は78.7%であり、平面部11aに入射した光量は、3.4%であった。このように、光量をシミュレーションすることにより、底面11において、光学的に影響が少ない領域を特定できる。 In the bottom surface 11, the region where the optical influence is small varies depending on the propagation mechanism of the internally incident light of the light flux controlling member 1, but the light emitted from the optical element 2 (light whose angle with respect to the optical axis is close to 90 degrees) is a light flux. It is a region that is incident on the inside of the control member 1 and is not easily incident on the legs 14 and the fall-preventing structure 15 as internal incident light. For example, in FIG. 1, a flat portion disposed between the Z coordinate increasing regions It is preferable to provide the leg part 14 and the fall prevention structure 15 in 11a. Further, the internal incident light may travel downward due to reflection on the exit surface 12 or the like, but it is more preferable to set the region where the downward internal incident light is small. When the total amount of light emitted from the light emitting element 2 is 100%, the region where the amount of light reaching the region is 7% or less can be said to be a region with little internal incident light. As a result of simulating the amount of light emitted to the exit surface 12 and the amount of light incident on the flat portion 11a of the bottom surface 11 for the light flux controlling member 1 in FIG. The amount of incident light was 78.7%, and the amount of light incident on the flat surface portion 11a was 3.4%. In this way, by simulating the light amount, it is possible to specify a region on the bottom surface 11 that is less optically affected.
底面凹部16は、底面11と光軸とが交わる領域近辺に形成されており、光学素子2から出射された光を効率よく入射させることができる。底面凹部16の内側上面は、光学素子2から出射された光の少なくとも一部を内部に入射させる入射面となる。底面凹部16内において、光学素子2の出射面が底面11の平面部11aよりも上に位置するように配置すれば、光学素子2からX軸方向に出射した光(光軸に対する角度が90度に近い光)は、底面凹部16の内側側面に入射して内部入射光として平面部11aよりも上側を通過するため、平面部11aに設けられた脚部14及び転倒防止構造15に対する光学的な影響を少なくすることができ、例えば、脚部14及び転倒防止構造15を底面11の平面部11a以外に配置し易くなる。さらに、底面凹部16の内面を曲面や傾斜面とすることにより、光束制御機能を持たせることも可能である。図1の底面凹部16は略直方体状である。 The bottom surface recess 16 is formed in the vicinity of the region where the bottom surface 11 and the optical axis intersect, and allows the light emitted from the optical element 2 to be efficiently incident. The inner upper surface of the bottom recess 16 serves as an incident surface on which at least part of the light emitted from the optical element 2 is incident. If the light emitting surface of the optical element 2 is positioned so as to be located above the flat surface portion 11a of the bottom surface 11 in the bottom surface recess 16, the light emitted from the optical element 2 in the X-axis direction (the angle with respect to the optical axis is 90 degrees). Is incident on the inner side surface of the bottom concave portion 16 and passes as an internal incident light above the plane portion 11a, so that the leg portion 14 provided on the plane portion 11a and the fall prevention structure 15 are optically coupled. The influence can be reduced, and for example, the leg portions 14 and the fall-preventing structure 15 can be easily arranged other than the flat portion 11 a of the bottom surface 11. Furthermore, by making the inner surface of the bottom recess 16 a curved surface or an inclined surface, it is possible to provide a light beam control function. 1 has a substantially rectangular parallelepiped shape.
出射面凹部17は、出射面12の中央に設けられており、内部入射光のうち光軸近辺の光軸に対する角度が0度に近い光の少なくとも一部をX軸方向の正側および負側に向けて全反射させる一対の側面17aを有している。図1においては、一対の側面17aは、光軸を中心としてX軸方向に対象に配置され、光軸との交点が最も発光素子側に配置されたY軸に平行な傾斜面である。なお、出射面凹部17による全反射面(図1では一対の側面17a)は、光学素子2の発光中心から出射する光を効率よく全反射できるように設計されていれば足り、図2に示すように、側面17aから外部に出射する光が生じてもよい。 The exit surface recess 17 is provided in the center of the exit surface 12, and at least a part of the light incident near the optical axis in the vicinity of the optical axis of the internal incident light is close to 0 degrees on the positive side and the negative side in the X-axis direction. A pair of side surfaces 17a for total reflection toward the surface. In FIG. 1, the pair of side surfaces 17 a are inclined surfaces that are arranged in the X-axis direction with the optical axis as the center, and the intersection with the optical axis is parallel to the Y-axis that is arranged closest to the light emitting element. Note that the total reflection surfaces (the pair of side surfaces 17a in FIG. 1) formed by the exit surface recesses 17 need only be designed so that the light emitted from the light emission center of the optical element 2 can be efficiently totally reflected, as shown in FIG. Thus, the light radiate | emitted outside from the side surface 17a may arise.
[発光装置]
図2に示すように、発光装置4は、実装基板3上に出射される光の光軸OAが実装基板3の表面に対する法線と略平行になるように発光素子2を配置し、さらに発光素子2を覆って光束制御部材1の底面11中心(または底面凹部16の中心)が光軸と重なるように光束制御部材1が固定される。実装基板3上に配置される光学制御部材1及び発光素子2の数は特に限定されない。発光装置4は、複数の光学制御部材1及び発光素子2を実装基板3に配置し、複数の光源を有する発光装置4としてもよいし、図2に示すように、実装基板3上に1つの光学制御部材1及び発光素子2を配置し、光源が1つの発光装置4としてもよい。
[Light emitting device]
As shown in FIG. 2, the light emitting device 4 has the light emitting element 2 disposed so that the optical axis OA of the light emitted onto the mounting substrate 3 is substantially parallel to the normal to the surface of the mounting substrate 3, and further emits light. The light flux controlling member 1 is fixed so as to cover the element 2 and so that the center of the bottom surface 11 of the light flux controlling member 1 (or the center of the bottom concave portion 16) overlaps the optical axis. The numbers of the optical control member 1 and the light emitting elements 2 arranged on the mounting substrate 3 are not particularly limited. The light-emitting device 4 may be a light-emitting device 4 having a plurality of light sources by disposing a plurality of optical control members 1 and light-emitting elements 2 on a mounting substrate 3, or as shown in FIG. The optical control member 1 and the light emitting element 2 may be disposed, and the light source 4 may have one light source.
発光素子2は、発光装置4(および面光源装置6、表示装置)の光源である。発光素子2は、LED、電球、キセノンランプ、半導体レーザー、有機EL素子、超小型蛍光管などを採用することができる。発光素子2は、特に限定されるものではないが、例えば白色発光ダイオードなどの発光ダイオード(LED)である。 The light emitting element 2 is a light source of the light emitting device 4 (and the surface light source device 6 and the display device). As the light emitting element 2, an LED, a light bulb, a xenon lamp, a semiconductor laser, an organic EL element, a micro fluorescent tube, or the like can be adopted. Although the light emitting element 2 is not specifically limited, For example, it is light emitting diodes (LED), such as a white light emitting diode.
実装基板3は、発光素子2を実装し、光制御部材1が固定される。さらに、実装基板3は、光束制御部材1の脚部14を接着するための接着用の基板凹部31を有していることが好ましい。また、実装基板3は、発光素子2に電力等を供給するための配線が設けられていてもよい。実装基板3の形状は、好ましくは、光制御部材1と同じくX軸方向に細長い形状であり、光制御部材1のX軸方向を揃えて図2のように配置することが好ましい。 The mounting substrate 3 mounts the light emitting element 2 and the light control member 1 is fixed. Furthermore, it is preferable that the mounting substrate 3 has a bonding substrate recess 31 for bonding the leg portion 14 of the light flux controlling member 1. Further, the mounting substrate 3 may be provided with wiring for supplying power or the like to the light emitting element 2. The shape of the mounting substrate 3 is preferably elongated in the X-axis direction like the light control member 1 and is preferably arranged as shown in FIG. 2 with the X-axis direction of the light control member 1 aligned.
図2(A)に示す発光装置4では、発光素子1の出射面が光制御部材1の底面11における底面凹部16に対向して配置されており、発光素子1から出射した光の大部分は、光制御部材1の底面凹部16の内面を介して光制御部材1内部に入射する。内部入射光のうち出射面凹部17に進む光軸付近の光は、出射面凹部17の側面17aによって一部がX軸方向の正側および負側に内部反射し、一部が透過して外部に出射する。X軸方向の正側および負側に反射した光は、出射面12によって内部反射し、X軸方向外側に配置された底面11の曲面部11bによって出射面12側に内部反射し、出射面12から外部に出射する。このとき、曲面部11bによって内部反射し、出射面12において光が出射された位置は、発光点のようになる。 In the light emitting device 4 shown in FIG. 2A, the emission surface of the light emitting element 1 is disposed to face the bottom surface recess 16 in the bottom surface 11 of the light control member 1, and most of the light emitted from the light emitting element 1 is The light enters the light control member 1 through the inner surface of the bottom recess 16 of the light control member 1. Of the internal incident light, part of the light near the optical axis that travels to the exit surface recess 17 is internally reflected by the side surface 17a of the exit surface recess 17 to the positive side and the negative side in the X-axis direction, and part of the light is transmitted outside To exit. The light reflected to the positive side and the negative side in the X-axis direction is internally reflected by the emission surface 12, and is internally reflected to the emission surface 12 side by the curved surface portion 11b of the bottom surface 11 arranged on the outer side in the X-axis direction. To the outside. At this time, the position where the light is emitted from the exit surface 12 after being internally reflected by the curved surface portion 11b is like a light emitting point.
また、内部入射光のうち出射面凹部17よりもX軸方向において外側に向かう光は、出射面12によって、一部が内部反射し、一部が透過して外部に出射する。内部反射した光は、底面11の平面部11a又は曲面部11bにおいて反射又は透過して外部に出射する。このように、出射面凹部17よりもX軸方向において外側に向かう光の一部が底面11の平面部11aに照射される可能性があり、脚部14や転倒防止構造15によって乱される可能性がある。このため、出射面凹部17を広くすることにより、底面11における光学的に影響が少ない領域を広くすることが可能である。 Further, a part of the internal incident light that is directed outward in the X-axis direction from the exit surface recess 17 is partially reflected internally by the exit surface 12 and partially transmitted to exit to the outside. The internally reflected light is reflected or transmitted by the flat surface portion 11a or the curved surface portion 11b of the bottom surface 11 and is emitted to the outside. As described above, a part of the light traveling outward in the X-axis direction from the exit surface concave portion 17 may be irradiated to the flat portion 11 a of the bottom surface 11, and may be disturbed by the leg portion 14 or the fall prevention structure 15. There is sex. For this reason, it is possible to widen the area | region with little optical influence in the bottom face 11 by making the output surface recessed part 17 wide.
なお、底面凹部16に対する発光素子2の位置を変化させることにより、内部入射光の配光状態を制御できる。具体的には、例えば底面凹部16と発光素2との間隔を狭くすることによって、発光素子2から出射された光のうち、底面凹部16の上面で入射する光の光量を増加させることができる。また、例えば底面凹部16と発光素子2との間隔を広くすることによって、発光素子2から出射された光のうち、底面凹部16の側面で入射する光の光量を増加させることができる。 Note that the light distribution state of the internal incident light can be controlled by changing the position of the light emitting element 2 with respect to the bottom recess 16. Specifically, for example, by narrowing the distance between the bottom surface recess 16 and the light emitting element 2, the amount of light incident on the top surface of the bottom surface recess 16 out of the light emitted from the light emitting element 2 can be increased. . Further, for example, by widening the gap between the bottom surface recess 16 and the light emitting element 2, the amount of light incident on the side surface of the bottom surface recess 16 among the light emitted from the light emitting element 2 can be increased.
[面光源装置等]
図3に示すように、面光源装置6は、発光装置4における光束制御部材1の出射面12を導光板5の側面に対向させ、発光装置4から出射した光を導光板5の側面から導光板5内部に入射させる。面光源装置6は、例えば、表示装置のバックライト、照明装置などに使用される。導光板5の一つの側面に一つの発光装置4を配置してもよいし、複数の発光装置4を配置してもよい。また、導光板5の複数の側面に、複数の発光装置4を配置してもよい。面光源装置6は、導光板5及び発光装置4等を収容する筐体(図示せず)、導光板5の表面以外に出射した光を反射する反射板(図示せず)、導光板5の表面に出射した光を拡散する光拡散部材(図示せず)を有していてもよい。
[Surface light source device, etc.]
As shown in FIG. 3, the surface light source device 6 is configured such that the emission surface 12 of the light flux controlling member 1 in the light emitting device 4 faces the side surface of the light guide plate 5 and guides the light emitted from the light emitting device 4 from the side surface of the light guide plate 5. The light is made incident inside the optical plate 5. The surface light source device 6 is used, for example, for a backlight of a display device, a lighting device, or the like. One light emitting device 4 may be disposed on one side surface of the light guide plate 5, or a plurality of light emitting devices 4 may be disposed. Further, a plurality of light emitting devices 4 may be arranged on a plurality of side surfaces of the light guide plate 5. The surface light source device 6 includes a housing (not shown) that houses the light guide plate 5, the light emitting device 4, etc., a reflection plate (not shown) that reflects light emitted outside the surface of the light guide plate 5, You may have the light-diffusion member (not shown) which diffuses the light radiate | emitted on the surface.
導光板5は、光束制御部材1から出射された光を導光しつつ、表面および/または裏面から出射する。導光板5の平面視形状は、被照射部材(例えば液晶パネル)の表示領域の形状に対応していることが好ましい。また、光束制御部材1から出射された光の利用効率を高める観点から、導光板5の厚みは、光束制御部材1の出射面12のY軸方向における長さよりも厚いことが好ましい。導光板5の表面又は裏面から出射された光は、Y軸方向に進む面状の光となる。導光板5の材料は、ポリメタクリル酸メチル(PMMA)やポリカーボネート(PC)、エポキシ樹脂(EP)、シリコーン樹脂などの光透過性樹脂、またはガラスである。導光板5の材料は、光束制御部材1と同じ材料であってもよいし、異なる材料であってもよい。 The light guide plate 5 guides the light emitted from the light flux controlling member 1 and emits it from the front surface and / or the back surface. The planar view shape of the light guide plate 5 preferably corresponds to the shape of the display area of the irradiated member (for example, a liquid crystal panel). Further, from the viewpoint of increasing the utilization efficiency of the light emitted from the light beam control member 1, the thickness of the light guide plate 5 is preferably thicker than the length of the light emission surface 12 of the light beam control member 1 in the Y-axis direction. The light emitted from the front surface or the back surface of the light guide plate 5 becomes planar light traveling in the Y-axis direction. The material of the light guide plate 5 is a light transmissive resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), epoxy resin (EP), silicone resin, or glass. The material of the light guide plate 5 may be the same material as the light flux controlling member 1 or a different material.
筐体は、その内部に発光装置、導光板および反射板を収容するための、1つの面の少なくとも一部が開放した形状の収容体である。筐体は、発光領域となる開口部が形成されており、この開口部は、光拡散部材により塞がれる。開口部は、通常は長方形状であるが、他の形状であってもよく、開口部の大きさは、光拡散部材に形成される発光領域(発光面)の大きさに相当する。筐体は、例えば、ポリメタクリル酸メチル(PMMA)やポリカーボネート(PC)などの樹脂や、ステンレス鋼やアルミニウムなどの金属などから構成される。 The housing is a housing body having a shape in which at least a part of one surface is opened for housing the light emitting device, the light guide plate, and the reflection plate therein. The housing is formed with an opening serving as a light emitting region, and the opening is closed by a light diffusing member. The opening is usually rectangular, but may have other shapes, and the size of the opening corresponds to the size of the light emitting region (light emitting surface) formed in the light diffusing member. The housing is made of, for example, a resin such as polymethyl methacrylate (PMMA) or polycarbonate (PC), or a metal such as stainless steel or aluminum.
反射板は、発光領域以外の領域内面の少なくとも一部に設けられ、例えば、筐体の底、側面等に配置されている。反射板は、導光板の裏面、側面等から出射した光、発光装置の出射面以外の面から出射した光を反射させて、導光板を介して光拡散部材に向かわせる。反射板は、例えば、ステンレス鋼やアルミニウムなどの金属などから構成される。また、筐体の内面を反射面として反射板の機能を持たせてもよい。 The reflection plate is provided on at least a part of the inner surface of the region other than the light emitting region, and is disposed, for example, on the bottom or side surface of the housing. The reflection plate reflects light emitted from the back surface, side surface, and the like of the light guide plate, and light emitted from a surface other than the light emission surface of the light emitting device, and directs the light toward the light diffusion member via the light guide plate. The reflector is made of, for example, a metal such as stainless steel or aluminum. Moreover, you may give the function of a reflecting plate by making the inner surface of a housing | casing into a reflective surface.
光拡散部材は、導光板5の出射側に配置され、例えば、筐体の開口部を塞ぐように配置されている。光拡散部材は、光拡散性を有する板状又はフィルム状の部材であり、導光板からの出射光を拡散させつつ透過させる。通常、光拡散部材は、液晶パネルなどの被照射部材とほぼ同じ大きさである。たとえば、光拡散部材は、ポリメタクリル酸メチル(PMMA)、ポリカーボネート(PC)、ポリスチレン(PS)、スチレン・メチルメタクリレート共重合樹脂(MS)などの光透過性樹脂により形成される。光拡散部材には、光拡散性を付与するため、表面に微細な凹凸が形成されているか、または光拡散部材の内部にビーズなどの光拡散子が分散している。 The light diffusing member is disposed on the light exit side of the light guide plate 5 and is disposed, for example, so as to close the opening of the housing. The light diffusing member is a plate-like or film-like member having light diffusibility, and allows light emitted from the light guide plate to pass through while diffusing. Usually, the light diffusing member is approximately the same size as an irradiated member such as a liquid crystal panel. For example, the light diffusing member is made of a light transmissive resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene (PS), styrene / methyl methacrylate copolymer resin (MS). In order to impart light diffusibility to the light diffusion member, fine irregularities are formed on the surface, or light diffusers such as beads are dispersed inside the light diffusion member.
本実施の形態に係る面光源装置6では、1つの発光素子2から出射された光は、対応する光束制御部材1によって分割され、1つの光束制御部材1の複数の発光点から、光が出射される。発光装置4の各発光点から出射された光は、導光板5の側面(入射面)で導光板5内に入射する。このとき、発光装置4の各発光点はほぼ等間隔であり、かつ各発光点から出射された光の光量および出射パターンも類似している。したがって、導光板5の入射面の形状が平面であっても、導光板5内にはほぼ均一に光が入射する。導光板5に入射した光は、導光板5内を進行しながら、表面および/または裏面から徐々に出射される。導光板5の裏面から出射した光は、図示しない反射板によって導光板5の裏面に向かって反射され、導光板5を透過して光拡散部材に向かう。導光板5の表面から出射された光も、光拡散部材に向かう。光拡散部材に到達した光は、光拡散部材で拡散されつつ光拡散部材を透過する。 In the surface light source device 6 according to the present embodiment, light emitted from one light emitting element 2 is divided by the corresponding light flux control member 1, and light is emitted from a plurality of light emitting points of one light flux control member 1. Is done. Light emitted from each light emitting point of the light emitting device 4 enters the light guide plate 5 at the side surface (incident surface) of the light guide plate 5. At this time, the light emitting points of the light emitting device 4 are substantially equally spaced, and the light amount and the emission pattern of the light emitted from each light emitting point are also similar. Therefore, even if the shape of the incident surface of the light guide plate 5 is a flat surface, light enters the light guide plate 5 almost uniformly. The light incident on the light guide plate 5 is gradually emitted from the front surface and / or the back surface while traveling through the light guide plate 5. The light emitted from the back surface of the light guide plate 5 is reflected toward the back surface of the light guide plate 5 by a reflection plate (not shown), passes through the light guide plate 5 and travels toward the light diffusion member. The light emitted from the surface of the light guide plate 5 is also directed to the light diffusing member. The light that has reached the light diffusing member passes through the light diffusing member while being diffused by the light diffusing member.
図4は、一つの実装基板3上に複数の光束制御部材1及び発光素子2を配置した面光源装置6の一実施形態である。実装基板3は、X軸方向に延在した長方形であり、実装基板3上に、光束制御部材1と発光素子2とが長手方向に3つ配置されている。そして、3つの光束制御部材1の出射面12側に導光板5の側面を対向させて配置している。図4においては、隣接する光束制御部材1の間に隙間を設けているが、光束制御部材1の出射光の配光特性に応じて、光束制御部材1から出射する光が均等になるように隙間の幅を調整することが好ましい。なお、隙間を設けなくてもよいし、複数の光束制御部材1をX軸方向の端部において連結して、複数の発光素子2に共通の光束制御部材1としてもよい。 FIG. 4 shows an embodiment of a surface light source device 6 in which a plurality of light flux controlling members 1 and light emitting elements 2 are arranged on one mounting substrate 3. The mounting board 3 has a rectangular shape extending in the X-axis direction, and three light flux controlling members 1 and three light emitting elements 2 are arranged on the mounting board 3 in the longitudinal direction. The light guide plate 5 is disposed so that the side surface of the light guide plate 5 faces the light exit surface 12 side of the three light flux control members 1. In FIG. 4, a gap is provided between the adjacent light flux control members 1, but the light emitted from the light flux control member 1 is made uniform according to the light distribution characteristics of the emitted light from the light flux control member 1. It is preferable to adjust the width of the gap. The gap may not be provided, or a plurality of light flux control members 1 may be connected at the end in the X-axis direction so as to be a light flux control member 1 common to the plurality of light emitting elements 2.
また、本発明の表示装置は、上記面光源装置6と、該面光源装置6からの光が照射される被照明部材とを備える。被照明部材は、例えば、液晶表示パネル、電飾看板、内照式標識等である。また、本発明の電子機器は、かかる表示装置を表示部として備えている。電子機器としては、携帯電話、カーナビゲーションシステム用の表示装置や、PDA(Personal Digital Assistants)、モバイルコンピューター、デジタルカメラ、デジタルビデオカメラ、車載機器、オーディオ機器、携帯用ゲーム機、信号機等を例示することができるが、これらに限定されるものではない。 The display device of the present invention includes the surface light source device 6 and a member to be illuminated to which light from the surface light source device 6 is irradiated. The illuminated member is, for example, a liquid crystal display panel, an electric signboard, an internally illuminated sign, or the like. The electronic apparatus of the present invention includes the display device as a display unit. Examples of electronic devices include mobile phones, display devices for car navigation systems, PDAs (Personal Digital Assistants), mobile computers, digital cameras, digital video cameras, in-vehicle devices, audio devices, portable game machines, traffic lights, and the like. However, it is not limited to these.
[第2の実施形態]
図5は本発明の光束制御部材1の第2の実施形態を示す図であり、(A)は平面図、(B)は正面図、(C)は側面図、(D)は底面図、(E)は発光素子2側から見た場合の斜視図である。図5の光束制御部材1は、図1の光束制御部材と転倒防止構造25のみが異なる。図5の光束制御部材1の転倒防止構造25は、図5(A)、(C)、(D)から明らかであるが、側面13の平面部13aよりもY軸方向について、外側に突出した突出部25aを有している。この突出部25aにより、光束制御部材1がY軸方向に傾いたり、転倒したりするのをより防止することができる。転倒防止機能をより効果的なものとするために、突出部25aを光束制御部材1の両側面13から突出するように設けてもよい。ただし、光束制御部材1を面光源装置6として組立てる場合の観点からは、光束制御部材1の側面の一方は、面光源装置6の底となるので、突出部25aは、いずれか一方にのみ設け、他方は面光源装置6の底として、突出部を設けないことが好ましく、側面13の平面部13aと同じ平面とすることがより好ましい。
[Second Embodiment]
FIG. 5 is a view showing a second embodiment of the light flux controlling member 1 of the present invention, (A) is a plan view, (B) is a front view, (C) is a side view, (D) is a bottom view, (E) is a perspective view when viewed from the light emitting element 2 side. The light flux controlling member 1 in FIG. 5 differs from the light flux controlling member in FIG. The overturning prevention structure 25 of the light flux controlling member 1 in FIG. 5 is apparent from FIGS. 5A, 5 </ b> C, and 4 </ b> D, but protrudes outward in the Y-axis direction from the flat portion 13 a of the side surface 13. It has a protrusion 25a. The protrusion 25a can further prevent the light flux controlling member 1 from tilting or falling over in the Y-axis direction. In order to make the fall prevention function more effective, the protruding portions 25 a may be provided so as to protrude from both side surfaces 13 of the light flux controlling member 1. However, from the viewpoint of assembling the light beam control member 1 as the surface light source device 6, one of the side surfaces of the light beam control member 1 is the bottom of the surface light source device 6, and thus the protruding portion 25 a is provided on only one of them. The other, as the bottom of the surface light source device 6, is preferably not provided with a protruding portion, and more preferably the same plane as the flat portion 13 a of the side surface 13.
[第3の実施形態]
図6は本発明の光束制御部材1の第3の実施形態を示す図であり、(A)は平面図、(B)は正面図、(C)は側面図、(D)は底面図、(E)は発光素子2側から見た場合の斜視図である。図6の光束制御部材1は、図1の光束制御部材と転倒防止構造35のみが異なる。図6の光束制御部材1の転倒防止構造35は、図6(D)から明らかであるが、Y軸方向に離間して並置された2つの転倒防止構造35がX軸方向に対象に一対設けられ、全体として4つの転倒防止構造35が設けられている。各転倒防止構造35は、Y軸方向の外側側面は、側面13の平面部13aと同じ平面となっている。Y軸方向に離間して並置させたことにより、転倒防止構造35による光の配光乱れを減らすことができる。さらに、実験の結果によれば、光束制御部材1がY軸方向に傾いたり、転倒したりするのをより防止できた。なお、図6の転倒防止構造35についても、側面13の平面部13aよりもY軸方向について、外側に突出した突出部を設けてもよい。
[Third Embodiment]
FIG. 6 is a view showing a third embodiment of the light flux controlling member 1 of the present invention, where (A) is a plan view, (B) is a front view, (C) is a side view, (D) is a bottom view, (E) is a perspective view when viewed from the light emitting element 2 side. The light flux controlling member 1 in FIG. 6 differs from the light flux controlling member in FIG. The fall prevention structure 35 of the light flux controlling member 1 in FIG. 6 is apparent from FIG. 6D, but a pair of two fall prevention structures 35 that are spaced apart from each other in the Y axis direction are provided in the X axis direction. As a whole, four fall prevention structures 35 are provided. Each fall prevention structure 35 has an outer side surface in the Y-axis direction that is the same plane as the flat portion 13 a of the side surface 13. Dispersion of light due to the overturning prevention structure 35 can be reduced by separating and juxtaposing them in the Y-axis direction. Furthermore, according to the result of the experiment, it was possible to further prevent the light flux controlling member 1 from being inclined or toppled over in the Y-axis direction. 6 may also be provided with a protruding portion that protrudes outward in the Y-axis direction relative to the flat surface portion 13a of the side surface 13.
[比較例]
図7は、比較例として、転倒防止構造を有していない光束制御部材41を示す図であり、(A)は平面図、(B)は正面図、(C)は側面図、(D)は底面図、(E)は発光素子2側から見た場合の斜視図である。図7の光束制御部材41は、図1〜図6の光束制御部材と転倒防止構造を有していない点でのみ異なる。
[Comparative example]
FIG. 7 is a diagram showing a light flux controlling member 41 that does not have a fall prevention structure as a comparative example, where (A) is a plan view, (B) is a front view, (C) is a side view, and (D). Is a bottom view, and (E) is a perspective view when viewed from the light emitting element 2 side. The light flux control member 41 in FIG. 7 differs from the light flux control member in FIGS. 1 to 6 only in that it does not have a fall prevention structure.
[せん断力測定実験]
図8は、第1の実施形態(図1)、第2の実施形態(図5)、第3の実施形態(図6)及び比較例(図7)の光学制御部材の脚部を実装基板上に接着剤で固定した後、せん断力を測定した実験結果である。実験は、各2サンプルを作成し測定した。接着剤はLOCTITE3280を使用し、各脚部を約0.7mg(1滴)の接着剤で実装基板の基板凹部に接着させ、ホットプレートで80度、5分硬化させて実験用のサンプルとした。なお、転倒防止構造については、実装基板と接着させていない。このサンプルの実装基板を固定した状態でY軸方向から荷重を印加した。光学制御部材が実装基板から外れた時の荷重でせん断力を評価した。比較例では、16.28N、17.42Nであり、平均16.85Nであったが、第1の実施形態では、21.80N、25.08Nであり、平均23.44Nに増加した。第2の実施形態では、44.65N、33.81Nであり、平均39.23Nに大きく増加した。第3の実施形態では、30.25N、30.31Nであり、平均30・29Nと増加した。
[Shearing force measurement experiment]
FIG. 8 shows a mounting board for the legs of the optical control members of the first embodiment (FIG. 1), the second embodiment (FIG. 5), the third embodiment (FIG. 6), and the comparative example (FIG. 7). It is the experimental result which measured the shear force, after fixing with an adhesive agent on the top. In the experiment, two samples were prepared and measured. The adhesive used was LOCTITE 3280, and each leg was adhered to the substrate recess of the mounting substrate with about 0.7 mg (one drop) of adhesive, and cured on a hot plate at 80 ° C. for 5 minutes to obtain an experimental sample. . Note that the fall prevention structure is not bonded to the mounting substrate. A load was applied from the Y-axis direction with the mounting substrate of this sample fixed. Shear force was evaluated by the load when the optical control member was detached from the mounting substrate. In the comparative example, it was 16.28N and 17.42N, and the average was 16.85N, but in the first embodiment, it was 21.80N and 25.08N, which increased to an average of 23.44N. In 2nd Embodiment, they were 44.65N and 33.81N, and increased large on average to 39.23N. In 3rd Embodiment, it was 30.25N and 30.31N, and increased on average 30.29N.
以上のとおり、転倒防止構造を設けることにより、光学制御部材がY軸方向の荷重に強くなり、転倒しにくくなったことが確認された。特に、第2の実施形態のように、Y軸方向の突出部を設けたものでは、比較例の2倍以上のせん断力を示した。 As described above, it was confirmed that by providing the fall prevention structure, the optical control member became strong against the load in the Y-axis direction and was difficult to fall. In particular, as in the second embodiment, the one provided with the protruding portion in the Y-axis direction showed a shearing force twice or more that of the comparative example.
1 光束制御部材
2 発光素子
3 実装基板
4 発光装置
5 導光板
6 面光源装置
11 底面
12 出射面
13 側面
14 脚部
15 転倒防止構造
16 底面凹部
17 出射面凹部
DESCRIPTION OF SYMBOLS 1 Light flux control member 2 Light emitting element 3 Mounting board 4 Light-emitting device 5 Light guide plate 6 Surface light source device 11 Bottom surface 12 Outgoing surface 13 Side surface 14 Leg part 15 Fall prevention structure 16 Bottom surface recessed part 17 Outgoing surface recessed part
Claims (14)
前記X軸方向の寸法は、前記Z軸方向と前記X軸方向とに直交するY軸方向の寸法に比べて長く、
前記発光素子側に面する底面に、発光素子側に突出した脚部と、発光素子側に突出した転倒防止構造とを有し、
前記転倒防止構造の少なくとも一部は、前記Y軸方向について前記脚部よりも外側の位置に配置されていることを特徴とする光束制御部材。 Light emitted from the light emitting element is incident on the inside, and the width of the light in the X-axis direction perpendicular to the Z-axis direction parallel to the optical axis of the light emitted from the light emitting element is made wider than that at the time of incidence and emitted to the outside. A light flux controlling member
The dimension in the X-axis direction is longer than the dimension in the Y-axis direction orthogonal to the Z-axis direction and the X-axis direction,
The bottom surface facing the light emitting element side has a leg portion protruding to the light emitting element side, and a fall prevention structure protruding to the light emitting element side,
At least a part of the fall prevention structure is arranged at a position outside the leg in the Y-axis direction.
前記X軸方向の寸法は、前記Z軸方向と前記X軸方向とに直交するY軸方向の寸法に比べて長く、
前記発光素子側に面する底面に、発光素子側に突出した脚部と、発光素子側に突出した転倒防止構造とを有し、
前記転倒防止構造の先端の突出高さは、前記脚部の先端の突出高さと同じ又は低いことを特徴とする光束制御部材。 Light emitted from the light emitting element is incident on the inside, and the width of the light in the X-axis direction perpendicular to the Z-axis direction parallel to the optical axis of the light emitted from the light emitting element is made wider than that at the time of incidence and emitted to the outside. A light flux controlling member
The dimension in the X-axis direction is longer than the dimension in the Y-axis direction orthogonal to the Z-axis direction and the X-axis direction,
The bottom surface facing the light emitting element side has a leg portion protruding to the light emitting element side, and a fall prevention structure protruding to the light emitting element side,
The light flux controlling member, wherein a protrusion height of the tip of the fall prevention structure is the same as or lower than a protrusion height of the tip of the leg.
前記底面には、前記発光素子から出射された光を内部に入射させる入射部が形成され、
前記出射面には、前記光軸方向において前記入射部の反対側に位置し、前記入射部から入射した光の一部を全反射してX軸方向の正側と負側へ光を振り分ける出射面凹部が形成され、
前記発光素子から光が出射される方向を前記Z軸の正方向としたとき、
前記底面には、前記出射面凹部によって全反射された光が到達する位置の少なくとも一部に、前記X軸方向について外側になるにしたがってZ座標が大きくなるZ座標増大領域が前記X軸方向の正側と負側とに一対形成され、
前記転倒防止構造の少なくとも一部は、前記一対のZ座標増大領域の間に配置されていることを特徴とする請求項1又は2に記載の光束制御部材。 The light flux controlling member has an exit surface located on the side opposite to the bottom surface,
The bottom surface is formed with an incident portion for making the light emitted from the light emitting element incident inside,
The exit surface is located on the opposite side of the incident portion in the optical axis direction, and partially reflects the light incident from the incident portion and distributes the light to the positive side and the negative side in the X-axis direction. A concave surface is formed,
When the direction in which light is emitted from the light emitting element is the positive direction of the Z axis,
On the bottom surface, at least a part of the position where the light totally reflected by the exit surface concave portion reaches is a Z coordinate increasing region in which the Z coordinate increases in the X-axis direction in the X-axis direction. A pair is formed on the positive side and the negative side,
The light flux controlling member according to claim 1, wherein at least a part of the fall prevention structure is disposed between the pair of Z coordinate increasing regions.
前記底面が前記発光素子と対向し、前記Z軸方向が前記発光素子から出射される光の光軸と平行となるように配置された請求項1乃至7の何れか1項に記載の光束制御部材と、
を有することを特徴とする発光装置。 A light emitting element;
The light flux control according to any one of claims 1 to 7, wherein the bottom surface faces the light emitting element, and the Z-axis direction is disposed in parallel with an optical axis of light emitted from the light emitting element. Members,
A light emitting device comprising:
前記光束制御部材の前記脚部を前記実装基板に固定したことを特徴とする請求項8に記載の発光装置。 A mounting substrate on which the light emitting element is mounted;
The light emitting device according to claim 8, wherein the leg portion of the light flux controlling member is fixed to the mounting substrate.
前記発光装置からの光を導光させつつ出射させる導光板と、
を有することを特徴とする面光源装置。 A light emitting device according to any one of claims 8 to 11,
A light guide plate that emits light while guiding light from the light emitting device;
A surface light source device comprising:
前記面光源装置からの光が照射される被照明部材と、
を有することを特徴とする表示装置。
を備えた表示装置。 A surface light source device according to claim 12,
An illuminated member to which light from the surface light source device is irradiated;
A display device comprising:
A display device comprising:
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