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JP5733750B2 - Luminous flux control member, light emitting device, and surface light source device - Google Patents

Luminous flux control member, light emitting device, and surface light source device Download PDF

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Publication number
JP5733750B2
JP5733750B2 JP2011108991A JP2011108991A JP5733750B2 JP 5733750 B2 JP5733750 B2 JP 5733750B2 JP 2011108991 A JP2011108991 A JP 2011108991A JP 2011108991 A JP2011108991 A JP 2011108991A JP 5733750 B2 JP5733750 B2 JP 5733750B2
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Prior art keywords
light
surface portion
light emitting
optical axis
flux controlling
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JP2012243396A (en
Inventor
山口 昌男
昌男 山口
齊藤 共啓
共啓 齊藤
康幸 福田
康幸 福田
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Enplas Corp
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Enplas Corp
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Description

この発明は、発光素子(例えば、LED)からの光を出射制御する光束制御部材、この
光束制御部材を使用した発光装置、及びこの発光装置を使用して液晶表示パネル等の被照
明部材を面状に照明する面光源装置に関するものである。
The present invention relates to a light beam control member that controls the emission of light from a light emitting element (for example, an LED), a light emitting device that uses the light beam control member, and a surface to be illuminated such as a liquid crystal display panel using the light emitting device. The present invention relates to a surface light source device that illuminates in a shape.

近年、省エネルギーや環境保全の観点から、LEDを光源とする発光装置によって広告
パネル等の被照明部材を照明するようになっている。
In recent years, from the viewpoint of energy saving and environmental protection, illuminated members such as advertising panels are illuminated by light emitting devices using LEDs as light sources.

例えば、図8に示す発光装置100は、LED101からの光が光方向変換用光学素子102を介して照明光として出射されるようになっている。この発光装置100の光方向変換用光学素子102は、LED101からの光を光入射面103から内部に入射させ、その光入射面103から入射した光の一部を光反射面104によって反射して光出射面(円筒状の側面)105から出射させ、光入射面103から入射した光のうちの光出射面105から出射した光を除く光の一部を光反射面104から出射するようになっている。そして、このような発光装置100は、広告パネル等の被照明部材(図示せず)の背面側に複数配置され、被照明部材を背面側から面状に照明するようになっている(特許文献1)。 For example, the light emitting device 100 shown in FIG. 8 is configured such that light from the LED 101 is emitted as illumination light via the optical direction conversion optical element 102. The light direction changing optical element 102 of the light emitting device 100 causes the light from the LED 101 to enter the inside from the light incident surface 103, and reflects a part of the light incident from the light incident surface 103 by the light reflecting surface 104. A part of the light that is emitted from the light exit surface (cylindrical side surface) 105 and is emitted from the light exit surface 105 out of the light incident from the light incident surface 103 is emitted from the light reflecting surface 104. ing. A plurality of such light emitting devices 100 are arranged on the back side of an illuminated member (not shown) such as an advertising panel, and illuminate the illuminated member in a planar shape from the back side (Patent Literature). 1).

再公表特許第WO2008/007492号公報(特に、段落番号0028、図1、図8参照)Republished Patent No. WO2008 / 007492 (refer to paragraph number 0028, FIG. 1 and FIG. 8 in particular)

しかしながら、図8に示した従来の発光装置100は、光反射面104からも光が出射
するようになっているため、LED101及び光方向変換用光学素子102の直上方向に
も多くの光が出射される。その結果、LED101からの光が光方向変換用光学素子10
2の直上方向へ出射するのを抑え、LED101からの光を光方向変換用光学素子102
の側方(LED101からの立体的な出射光束の中心の光の進行方向を光軸Lとすると、
その光軸Lに直交する方向)へ広く出射させる必要がある場合には、従来の発光装置10
0を使用することができなかった。
However, since the conventional light emitting device 100 shown in FIG. 8 emits light also from the light reflecting surface 104, a lot of light is emitted directly above the LED 101 and the optical element 102 for changing the light direction. Is done. As a result, the light from the LED 101 is converted into the light direction converting optical element 10.
2, and the light from the LED 101 is converted into an optical element 102 for changing the light direction.
Side (the traveling direction of light at the center of the three-dimensional emitted light beam from the LED 101 is the optical axis L,
When it is necessary to emit light widely in the direction orthogonal to the optical axis L), the conventional light emitting device 10 is used.
0 could not be used.

そこで、本発明は、発光素子からの光が発光素子の直上方向へ出射するのを抑えること
ができ、且つ、発光素子からの光を側方へ広く出射することができる光束制御部材、この
光束制御部材を使用した発光装置、及びこの発光装置を使用した面光源装置を提供するこ
とを目的とする。
Accordingly, the present invention provides a light flux controlling member capable of suppressing the light from the light emitting element from being emitted in the direction directly above the light emitting element, and capable of widely emitting the light from the light emitting element to the side, and the light flux. An object of the present invention is to provide a light emitting device using a control member and a surface light source device using the light emitting device.

請求項1の発明は、図1,図5及び図6に示すように、発光素子3からの光を入射させる光入射面部7と、この光入射面部7から入射した光を反射する光反射面部11と、この光反射面部11で反射された光を出射する光出射面部12と、を有する光束制御部材4に関するものである。この請求項1の発明において、
前記光入射面部7は、
・前記光束制御部材4のうちの前記発光素子3に対向する裏面5側に形成されており、前記発光素子3からの立体的な出射光束の中心の光が進行する方向を光軸Lとすると、この光軸Lを中心とするように配置され且つ前記発光素子3に対向するように配置され、
・前記出射光束のうちの前記光軸Lの近傍に位置する中心側の光束部分である第1光束部分を入射させる第1光入射面部分13と、
・前記第1光入射面部分13を取り囲むように配置され、前記出射光束のうちの前記第1光束部分を取り囲むように位置する第2光束部分の光の進行方向が前記光軸Lにほぼ沿った方向となるように光路変換して前記光束制御部材4内へ入射させる第2光入射面部分14と、を有している。また、
前記光反射面部11は、
・前記光束制御部材4のうちの前記裏面5に対向する頂面8から前記裏面5側へ向かって凹むテーパー形状の凹所10を形作るテーパー面であって、このテーパー面が前記光軸Lを中心とする回転対称面であり、
・前記第1光入射面部分13及び前記第2光入射面部分14から入射した光を前記光出射面部12に向けて全反射するようになっている。また、
前記光出射面部12は、
・前記頂面8と前記裏面5とを接続する筒状面であって、前記光軸Lを中心とする筒状面であり、
・前記光軸Lに直交する方向を側方とすると、前記光反射面部11で全反射された光を前記側方側へ向けて出射するようになっている。そして、
前記第2光入射面部分14は、光軸Lを中心として同心円状に突出形成された複数の突
起15a,15bからなるフレネルレンズであり、
前記頂面は、前記光反射面部の周囲にリング状に形成されており、このリング状の頂面から漏れる光を拡散させることによってリング状の光の帯が発生しないように粗面化された、ことを特徴としている。
As shown in FIGS. 1, 5, and 6, the first aspect of the present invention is a light incident surface portion 7 on which light from the light emitting element 3 is incident and a light reflecting surface portion that reflects light incident from the light incident surface portion 7. 11 and a light flux controlling member 4 having a light emitting surface portion 12 that emits light reflected by the light reflecting surface portion 11. In the invention of claim 1,
The light incident surface portion 7 is
The light beam control member 4 is formed on the back surface 5 side facing the light emitting element 3, and the direction in which the light at the center of the three-dimensional emitted light beam from the light emitting element 3 travels is the optical axis L. , Disposed so as to be centered on the optical axis L and disposed so as to face the light emitting element 3;
A first light incident surface portion 13 on which a first light flux portion that is a central light flux portion located in the vicinity of the optical axis L of the emitted light flux is incident;
The light traveling direction of the second light beam portion which is disposed so as to surround the first light incident surface portion 13 and is positioned so as to surround the first light beam portion of the emitted light beam is substantially along the optical axis L. And a second light incident surface portion 14 that enters the light flux controlling member 4 after changing the optical path so as to be in the same direction. Also,
The light reflecting surface portion 11 is
A tapered surface that forms a tapered recess 10 that is recessed from the top surface 8 of the light flux controlling member 4 facing the back surface 5 toward the back surface 5, and the tapered surface defines the optical axis L. A rotationally symmetric surface around the center,
The light incident from the first light incident surface portion 13 and the second light incident surface portion 14 is totally reflected toward the light emitting surface portion 12. Also,
The light exit surface 12 is
A cylindrical surface connecting the top surface 8 and the back surface 5, the cylindrical surface centered on the optical axis L;
If the direction orthogonal to the optical axis L is the side, the light totally reflected by the light reflecting surface portion 11 is emitted toward the side. And
The second light incident surface portion 14 is a Fresnel lens composed of a plurality of projections 15a and 15b formed concentrically around the optical axis L.
The top surface is formed in a ring shape around the light reflecting surface portion, and is roughened so as not to generate a ring-shaped light band by diffusing light leaking from the ring-shaped top surface. , it is characterized in that.

請求項の発明は、図1,図5及び図6に示すように、基板2上に設置された発光素子3と、前記請求項に記載の光束制御部材4とを有し、 前記光束制御部材4の中心軸L1が前記光軸Lと同心に配置されてなる、ことを特徴とする発光装置1に関するものでる。
As shown in FIGS. 1, 5, and 6, the invention of claim 2 includes a light emitting element 3 installed on a substrate 2 and a light flux controlling member 4 according to claim 1 , wherein the light flux The light-emitting device 1 is characterized in that the central axis L1 of the control member 4 is arranged concentrically with the optical axis L.

請求項の発明は、図7に示すように、前記請求項に記載の発光装置1と、この発光装置1から出射した光を反射する反射部材25と、この反射部材25で反射された光で面状に照明される被照明部材26と、を備えたことを特徴とする面光源装置。
The invention of claim 3 is reflected by the light emitting device 1 of claim 2 , the reflecting member 25 that reflects the light emitted from the light emitting device 1, and the reflecting member 25, as shown in FIG. 7. A surface light source device comprising: an illuminated member 26 that is illuminated in a plane by light.

本発明の光束制御部材によれば、発光素子からの光が発光素子の直上方向へ出射するの
を抑えることができ、且つ、発光素子からの光を側方へ広く出射することができる。
According to the light flux controlling member of the present invention, it is possible to suppress the light from the light emitting element from being emitted in the direction directly above the light emitting element, and to widely emit the light from the light emitting element to the side.

本発明の実施の形態に係る発光装置を示すものである。図1(a)が発光装置1の側面図であり、図1(b)が発光装置1の平面図であり、図1(c)が発光装置1の裏面図であり、図1(d)が図1(b)のA1−A1線に沿って切断して示す発光装置1の断面図である。1 shows a light emitting device according to an embodiment of the present invention. 1A is a side view of the light emitting device 1, FIG. 1B is a plan view of the light emitting device 1, FIG. 1C is a rear view of the light emitting device 1, and FIG. FIG. 2 is a cross-sectional view of the light emitting device 1 cut along the line A1-A1 in FIG. 本発明の発光装置を構成する光束制御部材(第1例)の第2光入射面部分の拡大図であり、図2(a)が第2光入射面部分の第1の例、図2(b)が第2光入射面部分の第2の例、図2(c)が第2光入射面部分の第3の例を示す図である。FIG. 2 is an enlarged view of a second light incident surface portion of a light flux controlling member (first example) constituting the light emitting device of the present invention, and FIG. 2A is a first example of the second light incident surface portion, FIG. FIG. 2B is a diagram illustrating a second example of the second light incident surface portion, and FIG. 2C is a diagram illustrating a third example of the second light incident surface portion. 図1に示した発光装置の配光特性を示す図である。It is a figure which shows the light distribution characteristic of the light-emitting device shown in FIG. 図4(a)が図1(d)に対応する図であり、図4(b)が図4(a)の一部(第2光入射面部分の一部)を拡大して示す図であり、図4(c)が図4(a)のB方向から見た照明光を模式的に示す図である。4A is a diagram corresponding to FIG. 1D, and FIG. 4B is an enlarged view of a part of FIG. 4A (a part of the second light incident surface portion). FIG. 4C is a diagram schematically showing illumination light viewed from the B direction in FIG. 図5(a)が本発明の発光装置を構成する光束制御部材の第2例を示す平面図であり、図5(b)が図5(a)で示した光束制御部材の一部拡大図である。FIG. 5A is a plan view showing a second example of the light flux controlling member constituting the light emitting device of the present invention, and FIG. 5B is a partially enlarged view of the light flux controlling member shown in FIG. It is. 本発明の発光装置を構成する光束制御部材の第3例を示す断面図であり、図1(d)に対応する図である。It is sectional drawing which shows the 3rd example of the light beam control member which comprises the light-emitting device of this invention, and is a figure corresponding to FIG.1 (d). 本発明の発光装置を使用した面光源装置を示す図である。図7(a)が面光源装置の平面図、図7(b)が図7(a)のA2−A2線に沿って切断して示す断面図、図7(c)が図7(a)のA3−A3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 using the light-emitting device of this invention. 7A is a plan view of the surface light source device, FIG. 7B is a sectional view taken along line A2-A2 of FIG. 7A, and FIG. 7C is FIG. 7A. It is sectional drawing cut | disconnected and shown along the A3-A3 line | wire. 従来の発光装置を示す図である。It is a figure which shows the conventional light-emitting device.

以下、本発明の実施の形態を図面に基づき詳述する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(発光装置)
図1は、本実施形態に係る発光装置1を示すものである。なお、図1(a)が発光装置
1の側面図であり、図1(b)が発光装置1の平面図であり、図1(c)が発光装置1の
裏面図であり、図1(d)が図1(b)のA1−A1線に沿って切断して示す発光装置1
の断面図である。
(Light emitting device)
FIG. 1 shows a light emitting device 1 according to this embodiment. 1A is a side view of the light emitting device 1, FIG. 1B is a plan view of the light emitting device 1, FIG. 1C is a rear view of the light emitting device 1, and FIG. d) Light-emitting device 1 shown by cutting along line A1-A1 in FIG.
FIG.

この図1に示すように、発光装置1は、基板2上に設置された発光素子3(例えば、L
ED及び封止部材によって封止されたLED)からの光を光束制御部材4を介して出射す
るようになっており、発光素子3と光束制御部材4とが一対一で対応している。そして、
この発光装置1は、発光素子3が実装された基板2上に光束制御部材4の裏面5側に立設
された脚部6が接着剤で固定され、光束制御部材4の中心軸L1が発光素子3の光軸Lと
同心上に位置するようになっている。ここで、発光素子3の光軸Lとは、発光素子3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。
As shown in FIG. 1, the light emitting device 1 includes a light emitting element 3 (for example, L) installed on a substrate 2.
The light from the ED and the LED sealed by the sealing member is emitted through the light flux control member 4, and the light emitting element 3 and the light flux control member 4 correspond one-to-one. And
In the light emitting device 1, a leg 6 erected on the back surface 5 side of the light flux controlling member 4 is fixed on the substrate 2 on which the light emitting element 3 is mounted with an adhesive, and the central axis L 1 of the light flux controlling member 4 emits light. It is positioned concentrically with the optical axis L of the element 3. Here, the optical axis L of the light emitting element 3 refers to the traveling direction of light at the center of the three-dimensional emitted light beam from the light emitting element 3.

(光束制御部材の第1例)
光束制御部材4は、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。
(First example of light flux controlling member)
The light flux controlling member 4 is made of, for example, a transparent resin material such as PMMA (polymethyl methacrylate), PC (polycarbonate), EP (epoxy resin), or transparent glass.

この光束制御部材4は、平面形状が円形形状となるように形成されており、その中心軸
L1が平面形状の図心に合致している。そして、この光束制御部材4は、発光素子3に対
向する裏面5(図1(a),(d)の下面)に形成された光入射面部7と、裏面5の反対
側に位置する頂面8(図1(a),(d)の上面)と、この頂面8から円錐状に凹む凹所
10を形作る円錐状の光反射面部11と、裏面5の外周端と頂面8の外周端に接続される
ように略円筒状に形作られた光出射面部12と、を有している。また、この光束制御部材
4は、光入射面部7よりも径方向外方側の裏面5に、4本の脚部6が周方向に沿って等間
隔に立設されている。
The light flux controlling member 4 is formed so that its planar shape is a circular shape, and its central axis L1 coincides with the centroid of the planar shape. The light flux controlling member 4 includes a light incident surface portion 7 formed on the back surface 5 (the bottom surface of FIGS. 1A and 1D) facing the light emitting element 3, and a top surface located on the opposite side of the back surface 5. 8 (the upper surface of FIGS. 1A and 1D), a conical light reflecting surface portion 11 that forms a concavity 10 recessed conically from the top surface 8, an outer peripheral edge of the back surface 5, and an outer periphery of the top surface 8 And a light emitting surface portion 12 formed in a substantially cylindrical shape so as to be connected to the end. In addition, the light flux controlling member 4 has four leg portions 6 erected at equal intervals along the circumferential direction on the back surface 5 radially outward from the light incident surface portion 7.

光入射面部7は、光束制御部材4の中心軸L1を中心とする円形状の平坦面である第1
光入射面部分13と、この第1光入射面部分13を取り囲むように形成された第2光入射
面部分14と、からなっている。第1光入射面部分13は、発光素子3からの出射光束の
うちの光軸L近傍に位置する中心側の光束部分であって、光の進行方向が光軸Lにほぼ沿
った方向である第1光束部分を入射させるようになっている。また、第2光入射面部分1
4は、発光素子3からの出射光束のうちの第1光束部分以外の光束部分であって、第1光
束部分を取り囲むように位置する第2光束部分を入射させるようになっている。この第2
光入射面部分14は、リング状の突起15a,15bが同心円状に複数形成されてなるフ
レネルレンズであって、突起15a,15bの各々は内側(中心軸L1寄り)に位置する
面15a1,15b1と外側に位置する面15a2,15b2との組み合わせで構成され
、第2光束部分の光の進行方向が光軸Lとほぼ平行な方向に揃うように、第2光束部分の
光を面15a1,15b1から入射し、面15a2,15b2で全反射するようになって
いる。ここで、第2光束部分の光の進行方向が光軸Lと「ほぼ」平行な方向に揃うとした
のは、第2光入射面部分14としてのフレネルレンズの製造誤差や、発光素子3と光束制
御部材4の組付誤差や、発光素子3の発光点が1点ではなく、ある面積をもって発光して
いることにより、第2光束部分の光の進行方向が光軸Lと平行な方向から(設計値から)
ずれることを考慮したものである。
The light incident surface portion 7 is a first circular flat surface centered on the central axis L1 of the light flux controlling member 4.
The light incident surface portion 13 and a second light incident surface portion 14 formed so as to surround the first light incident surface portion 13. The first light incident surface portion 13 is a central light flux portion located in the vicinity of the optical axis L of the light flux emitted from the light emitting element 3, and the traveling direction of the light is substantially along the optical axis L. The first light beam portion is made incident. The second light incident surface portion 1
Reference numeral 4 denotes a light beam portion other than the first light beam portion of the emitted light beam from the light emitting element 3, and a second light beam portion positioned so as to surround the first light beam portion is made incident thereon. This second
The light incident surface portion 14 is a Fresnel lens in which a plurality of ring-shaped protrusions 15a and 15b are concentrically formed, and each of the protrusions 15a and 15b is a surface 15a1 and 15b1 positioned on the inner side (near the central axis L1). And the surfaces 15a2 and 15b2 positioned on the outer side, and the light of the second light flux portion is made to face the surfaces 15a1, 15b1 so that the light traveling direction of the second light flux portion is aligned in a direction substantially parallel to the optical axis L. And is totally reflected by the surfaces 15a2 and 15b2. Here, the reason why the light traveling direction of the second light flux portion is aligned in a direction substantially “parallel” to the optical axis L is that the manufacturing error of the Fresnel lens as the second light incident surface portion 14 and the light emitting element 3 Assembling error of the light flux controlling member 4 and the light emitting point of the light emitting element 3 emit light with a certain area instead of one point, so that the light traveling direction of the second light flux portion is from the direction parallel to the optical axis L. (From design value)
This is in consideration of deviation.

光反射面部11は、図1(d)に示すように、中心軸L1に対する傾斜角が45°で且
つ頂角が90°の円錐面(中心軸L1を中心とする回転対称のテーパ面)であり、その円
錐面の頂点16が中心軸L1上に位置するように形成されている。また、この光反射面部
11は、その頂面8側端部の直径D2が光入射面部7の外周端側の直径D1以上の大きさ
(D1≦D2)になっている。このような光反射面部11は、光入射面部7から入射した
光を光出射面部12に向けて全反射するようになっている。なお、光反射面部11の頂面
8側端部の直径D2は、頂面8の外周端における直径D4よりも小さくなっている。
As shown in FIG. 1D, the light reflecting surface portion 11 is a conical surface having a tilt angle of 45 ° and an apex angle of 90 ° with respect to the central axis L1 (a rotationally symmetric tapered surface with the central axis L1 as the center). And the apex 16 of the conical surface is formed on the central axis L1. Further, the light reflecting surface portion 11 has a diameter D2 at the end portion on the top surface 8 side that is larger than a diameter D1 on the outer peripheral end side of the light incident surface portion 7 (D1 ≦ D2). Such a light reflecting surface portion 11 totally reflects the light incident from the light incident surface portion 7 toward the light emitting surface portion 12. Note that the diameter D2 of the end portion on the top surface 8 side of the light reflecting surface portion 11 is smaller than the diameter D4 at the outer peripheral end of the top surface 8.

光出射面部12は、射出成形金型(図示せず)からの光束制御部材4の離型を容易にす
るため、頂面8側端部の直径D4が裏面5側端部の直径D3よりも小さくなるように抜け
勾配がつけられている。
The light exit surface 12 has a diameter D4 at the end on the top surface 8 side larger than a diameter D3 at the end on the back surface 5 side in order to facilitate the release of the light flux controlling member 4 from an injection mold (not shown). A draft is added to make it smaller.

図2(a)は、図1(d)に示した光束制御部材4における第2光入射面部分14を拡
大して示す図である。この図2(a)に示すように、第2光入射面部分14は、最外周の
リング状の突起15bを除き、他のリング状の突起15aが同一高さとなるように形成さ
れている。なお、第2光入射面部分14は、図2(a)に示す形状に限定されるものでは
なく、図2(b)〜(c)に示すような形状にしてもよい。すなわち、図2(b)に示す
第2光入射面部分14は、最外周のリング状の突起15bに隣り合うリング状の突起15
aから最内周のリング状の突起15aまでが裏面5に対してθ1の角度で発光素子3に近
づくように斜めに形成されている(図1参照)。また、図2(c)に示す第2光入射面部
分14は、最外周のリング状の突起15bに隣り合うリング状の突起15aから最内周の
リング状の突起15aに向かうにしたがって突起高さが漸増するように形成されている。
ここで、図2(a)〜(c)に示す各第2光入射面部分14は、最外周のリング状の突起
15bに隣り合うリング状の突起15aの形成位置が裏面5からλの位置にある。このよ
うに第2光入射面部分14の形状を工夫することにより、面15a1,15b1から入射
して面15a2,15b2を経由せずに直接、光出射面部12へ到達する光を減少させる
ことができる。
FIG. 2A is an enlarged view showing the second light incident surface portion 14 in the light flux controlling member 4 shown in FIG. As shown in FIG. 2A, the second light incident surface portion 14 is formed such that other ring-shaped protrusions 15a have the same height except for the outermost ring-shaped protrusion 15b. In addition, the 2nd light-incidence surface part 14 is not limited to the shape shown to Fig.2 (a), You may make it a shape as shown to FIG.2 (b)-(c). That is, the second light incident surface portion 14 shown in FIG. 2B has a ring-shaped protrusion 15 adjacent to the outermost ring-shaped protrusion 15b.
From a to the innermost ring-shaped protrusion 15a is formed obliquely so as to approach the light emitting element 3 at an angle θ1 with respect to the back surface 5 (see FIG. 1). Further, the second light incident surface portion 14 shown in FIG. 2C has a protrusion height as it goes from the ring-shaped protrusion 15a adjacent to the outermost ring-shaped protrusion 15b to the innermost ring-shaped protrusion 15a. Is formed to gradually increase.
Here, in each of the second light incident surface portions 14 shown in FIGS. 2A to 2C, the formation position of the ring-shaped protrusion 15 a adjacent to the outermost ring-shaped protrusion 15 b is a position λ from the back surface 5. It is in. Thus, by devising the shape of the second light incident surface portion 14, it is possible to reduce the light that enters from the surfaces 15 a 1 and 15 b 1 and reaches the light emitting surface portion 12 directly without passing through the surfaces 15 a 2 and 15 b 2. it can.

(発光装置の配光特性)
図3(a)は、図1に示した発光装置1の配光特性を示す図である。この図3(a)に
示す発光装置1の配光特性は、図3(b)に示すように、発光素子3の発光中心17から
光軸Lに沿って所定寸法離れた位置(基準位置0°)に照度計18を配置し、その照度計
18を発光素子3の発光中心17を回転中心として、右回り方向(+θ方向)に360°
回転させて照度を測定したものである。
(Light distribution characteristics of light-emitting device)
FIG. 3A is a diagram showing the light distribution characteristics of the light emitting device 1 shown in FIG. The light distribution characteristic of the light emitting device 1 shown in FIG. 3A is a position (reference position 0) that is a predetermined distance away from the light emission center 17 of the light emitting element 3 along the optical axis L, as shown in FIG. 3B. °) is arranged at 360 °, and the illuminometer 18 is 360 ° clockwise (+ θ direction) with the light emission center 17 of the light emitting element 3 as the rotation center.
The illuminance is measured by rotating.

この図3(a)に示すように、本実施形態に係る発光装置1によれば、発光素子3の直
上方向(光軸Lに沿った方向)における照度に比較し、発光素子3の側方(光軸Lにほぼ
直交する方向)における照度が3倍程度大きくなっており、発光素子3からの光が光束制
御部材4の直上方向へ出射するのを抑えられ、且つ、発光素子3からの光が光束制御部材
4の側方へ広く出射されるようになっている。
As shown in FIG. 3A, according to the light emitting device 1 according to the present embodiment, the side of the light emitting element 3 is compared with the illuminance in the direction directly above the light emitting element 3 (the direction along the optical axis L). The illuminance in the direction (substantially orthogonal to the optical axis L) is about three times larger, the light from the light emitting element 3 can be prevented from being emitted directly above the light flux controlling member 4, and the light from the light emitting element 3 Light is emitted widely to the side of the light flux controlling member 4.

以上のように、本実施形態の発光装置1は、光束制御部材4の光入射面部7が発光素子
3からの光を光軸Lにほぼ沿った方向に揃うように光路変換させ、その光入射面部7から
入射した光の殆どを光反射面部11で全反射させて、光反射面部11で反射された光を光
出射面部12から光束制御部材4の側方に広く出射させることができる(図1参照)。そ
の結果、本実施形態の発光装置1は、発光素子3及び光束制御部材4の直上方向への光の
出射を抑えることができる(図3参照)。
As described above, the light emitting device 1 of the present embodiment changes the optical path so that the light incident surface portion 7 of the light flux controlling member 4 aligns the light from the light emitting element 3 in the direction substantially along the optical axis L, and the light incident Most of the light incident from the surface portion 7 can be totally reflected by the light reflecting surface portion 11, and the light reflected by the light reflecting surface portion 11 can be widely emitted from the light emitting surface portion 12 to the side of the light flux controlling member 4 (FIG. 1). As a result, the light emitting device 1 of the present embodiment can suppress the emission of light in the direction directly above the light emitting element 3 and the light flux controlling member 4 (see FIG. 3).

(光束制御部材の第2例)
上述したように、光束制御部材4の第1例は、発光素子3からの光が発光素子3の直上
方向へ出射するのを抑えることができ、発光素子3からの光の多くを光出射面部12から
側方へ出射させることができるようになっているが、リング状の平坦面である頂面8から
漏れた光が光束制御部材4の上方から(矢印Bの方向から)見た場合に、リング状の光の
帯20として視認される(図4参照)。但し、寸法は不問とする。これは、図4(b)に
示すように、第2光入射面部分14(フレネルレンズ)を構成する断面略三角形状の突起
15a,15bの先端に形成される曲面21から入射した光が頂面8から出射すること等
に起因するものである。したがって、このリング状の光の帯20が生じないようにするに
は、第2光入射面部分14(フレネルレンズ)を構成する突起15a,15bの先端を尖
らせる(曲面21を形成しないようにする)か、又は、リング状の平坦面である頂面8を
無くすことが有効な手段となるが、突起15a,15bの先端に曲面21を形成せず、リ
ング状の平坦面である頂面8を無くすことは製造上(射出成形上)及び光束制御部材4の
取扱い上困難である。
(Second example of light flux controlling member)
As described above, the first example of the light flux controlling member 4 can suppress the light from the light emitting element 3 from being emitted in the direction directly above the light emitting element 3, and most of the light from the light emitting element 3 is emitted from the light emitting surface portion. 12 when the light leaked from the top surface 8, which is a ring-shaped flat surface, is viewed from above the light flux controlling member 4 (from the direction of the arrow B). It is visually recognized as a ring-shaped light band 20 (see FIG. 4). However, the dimensions are not required. As shown in FIG. 4B, the light incident from the curved surface 21 formed at the tips of the projections 15a and 15b having a substantially triangular cross section constituting the second light incident surface portion 14 (Fresnel lens) is obtained. This is due to emission from the surface 8 or the like. Therefore, in order to prevent the ring-shaped light band 20 from occurring, the tips of the protrusions 15a and 15b constituting the second light incident surface portion 14 (Fresnel lens) are sharpened (the curved surface 21 is not formed). It is effective to eliminate the top surface 8 that is a ring-shaped flat surface, but the top surface is a ring-shaped flat surface without forming the curved surface 21 at the tips of the protrusions 15a and 15b. Eliminating 8 is difficult in manufacturing (injection molding) and handling of the light flux controlling member 4.

そこで、図5に示す光束制御部材の第2例は、リング状の頂面8の全体を粗面化し(微
小な凹凸で粗し)、リング状の頂面8から漏れる光を拡散させることにより、リング状の
光の帯20の発生を防止することができ、光束制御部材4の第1例よりも均一な照明光の
出射が可能になった。
Therefore, in the second example of the light flux controlling member shown in FIG. 5, the entire ring-shaped top surface 8 is roughened (roughened with minute irregularities), and light leaking from the ring-shaped top surface 8 is diffused. Further, the generation of the ring-shaped light band 20 can be prevented, and the illumination light can be emitted more uniformly than the first example of the light flux controlling member 4.

(光束制御部材の第3例)
図6に示す光束制御部材4の第3例は、頂面8側の直径D4’を光束制御部材4の第1
例における頂面8側の直径D4よりも大きくし(D4’≒2D4)、頂面8の全体を粗面
化したものである(図1(d)参照)。
(Third example of light flux controlling member)
In the third example of the light flux controlling member 4 shown in FIG.
The diameter is larger than the diameter D4 on the top surface 8 side in the example (D4′≈2D4), and the entire top surface 8 is roughened (see FIG. 1D).

この光束制御部材4の第3例は、光束制御部材4の第1例及び第2例よりも均一な照明
光の出射が可能になる(図1,図5参照)。
The third example of the light flux controlling member 4 can emit illumination light more uniformly than the first and second examples of the light flux controlling member 4 (see FIGS. 1 and 5).

(面光源装置)
図7は、上述の発光装置1を使用した面光源装置22を示す図である。なお、図7(a
)が面光源装置22の平面図、図7(b)が図7(a)のA2−A2線に沿って切断して
示す面光源装置22の断面図、図7(c)が図7(a)のA3−A3線に沿って切断して
示す面光源装置22の断面図である。
(Surface light source device)
FIG. 7 is a diagram showing a surface light source device 22 using the light emitting device 1 described above. Note that FIG.
) Is a plan view of the surface light source device 22, FIG. 7B is a sectional view of the surface light source device 22 cut along the line A2-A2 of FIG. 7A, and FIG. It is sectional drawing of the surface light source device 22 cut and shown along the A3-A3 line of a).

図7に示すように、面光源装置22は、平面形状が矩形形状で且つ上方に向けて開口す
る筐体23と、この筐体23の内部底面24上に配置された反射部材25と、筐体23の
中央部で且つ筐体3の長手方向(図7(a)のX方向)に沿って反射部材25上に一列に
配置された複数の発光装置1と、筐体23の開口部を塞ぐように配置される被照明部材2
6(例えば、液晶パネル,広告パネル)と、を有している。
As shown in FIG. 7, the surface light source device 22 includes a casing 23 having a rectangular planar shape and opening upward, a reflecting member 25 disposed on the inner bottom surface 24 of the casing 23, and a casing. A plurality of light emitting devices 1 arranged in a line on the reflecting member 25 along the longitudinal direction of the housing 3 along the longitudinal direction of the housing 3 (X direction in FIG. 7A), and the opening of the housing 23 Illuminated member 2 arranged so as to close
6 (for example, a liquid crystal panel or an advertising panel).

この面光源装置22において、反射部材25は、光反射性能に優れた板状部材で形成さ
れており、図7(c)に示すように、筐体23の内部底面24と平行で且つ筐体23の中
央部を一定の幅でX方向に沿って延びる平坦面25aと、この平坦面25aのY方向両端
から筐体23の開口端に向かって斜めに立ち上がる一対の傾斜面25b,25bとからな
っている。
In this surface light source device 22, the reflecting member 25 is formed of a plate-like member having excellent light reflecting performance, and is parallel to the inner bottom surface 24 of the housing 23 as shown in FIG. A flat surface 25a extending in the X direction with a constant width at the center of the flat surface 25, and a pair of inclined surfaces 25b and 25b that rise obliquely from both ends of the flat surface 25a in the Y direction toward the opening end of the housing 23. It has become.

このように構成された面光源装置22は、発光装置1から側方に向けて出射された光を
反射部材25及び筐体23の内壁面27で反射し、その反射光によって被照明部材26を
裏面側から面状に照明するようになっている。
The surface light source device 22 configured as described above reflects light emitted from the light emitting device 1 toward the side by the reflecting member 25 and the inner wall surface 27 of the housing 23, and the reflected light causes the illuminated member 26 to be illuminated. It is designed to illuminate in a planar form from the back side.

このような面光源装置22によれば、従来例よりも少ない発光装置1によって、被照明
部材26を均一な照明光で面状に照明できるため、従来例よりも部品点数を削減でき、軽
量化,省エネルギー化,及び製品価格の低廉化を図ることができる。
According to such a surface light source device 22, the illumination target member 26 can be illuminated in a planar shape with uniform illumination light by the light emitting device 1 that is smaller than in the conventional example, so that the number of components can be reduced and the weight can be reduced as compared with the conventional example. , Energy saving and product price reduction.

(変形例)
図1,図5及び図6に示した光束制御部材4の光出射面部12は、略円筒面を例示した
が、平面形状が楕円形や多角形(四角形,五角形,六角形等)の筒状面でもよい。なお、
略円筒面としたのは、光束制御部材4を射出成形金型から離型するのを容易にするため、
光束制御部材4の光出射面部12に抜け勾配を設けることにより、完全な円筒面で無くな
ることを考慮したものである。また、光反射部面部11は、円錐状凹部に限らず、光入射
面部7から入射した光を側方に向けて全反射可能なように設計された非球面状のテーパー
面でも良い。
(Modification)
The light exit surface portion 12 of the light flux controlling member 4 shown in FIGS. 1, 5, and 6 is exemplified by a substantially cylindrical surface, but the planar shape is an elliptical shape or a polygonal shape (square, pentagon, hexagon, etc.). It may be a surface. In addition,
The reason for the substantially cylindrical surface is to make it easier to release the light flux controlling member 4 from the injection mold.
This is because it is considered that the light exit surface portion 12 of the light flux controlling member 4 is not a complete cylindrical surface by providing a draft gradient. The light reflecting portion surface portion 11 is not limited to the conical concave portion, and may be an aspheric tapered surface designed so that the light incident from the light incident surface portion 7 can be totally reflected sideways.

本発明に係る発光装置1は、面光源装置22に使用される場合に限られず、案内灯や間
接照明具等として単独で使用することが可能である。
The light-emitting device 1 according to the present invention is not limited to being used for the surface light source device 22, and can be used alone as a guide light, an indirect illumination tool, or the like.

1……発光装置、2……基板、3……発光素子(例えば、LED)、4……光束制御部
材、5……裏面、7……光入射面部、8……頂面、10……凹所、11……光反射面部、
12……光出射面部、13……第1光入射面部分、14……第2光入射面部分、16……
頂点、22……面光源装置、25……反射部材、26……被照明部材、L……光軸(光束
の中心)、L1……中心軸
DESCRIPTION OF SYMBOLS 1 ... Light-emitting device, 2 ... Board | substrate, 3 ... Light emitting element (for example, LED), 4 ... Light flux control member, 5 ... Back surface, 7 ... Light incident surface part, 8 ... Top surface, 10 ... Recess, 11 ... light reflecting surface,
12... Light exit surface portion, 13... First light incident surface portion, 14.
Vertex 22... Surface light source device 25. Reflecting member 26. Illuminated member L L. Optical axis (center of light flux) L 1.

Claims (3)

発光素子からの光を入射させる光入射面部と、
この光入射面部から入射した光を反射する光反射面部と、
この光反射面部で反射された光を出射する光出射面部と、
を有する光束制御部材であって、
前記光入射面部は、
・前記光束制御部材のうちの前記発光素子に対向する裏面側に形成されており、前記発光素子からの立体的な出射光束の中心の光が進行する方向を光軸とすると、この光軸を中心とするように配置され且つ前記発光素子に対向するように配置され、
・前記出射光束のうちの前記光軸の近傍に位置する中心側の光束部分である第1光束部分を入射させる第1光入射面部分と、
・前記第1光入射面部分を取り囲むように配置され、前記出射光束のうちの前記第1光束部分を取り囲むように位置する第2光束部分の光の進行方向が前記光軸にほぼ沿った方向となるように光路変換して前記光束制御部材内へ入射させる第2光入射面部分と、を有しており、
前記光反射面部は、
・前記光束制御部材のうちの前記裏面に対向する頂面から前記裏面側へ向かって凹むテーパー形状の凹所を形作るテーパー面であって、このテーパー面が前記光軸を中心とする回転対称面であり、
・前記第1光入射面部分及び前記第2光入射面部分から入射した光を前記光出射面部に向けて全反射するようになっており、
前記光出射面部は、
・前記頂面と前記裏面とを接続する筒状面であって、前記光軸を中心とする筒状面であり、
・前記光軸に直交する方向を側方とすると、前記光反射面部で全反射された光を前記側方側へ向けて出射するようになっており、
前記第2光入射面部分は、光軸を中心として同心円状に突出形成された複数の突起からなるフレネルレンズであり、
前記頂面は、前記光反射面部の周囲にリング状に形成されており、このリング状の頂面から漏れる光を拡散させることによってリング状の光の帯が発生しないように粗面化された、
ことを特徴とする光束制御部材。
A light incident surface portion on which light from the light emitting element is incident;
A light reflecting surface portion that reflects light incident from the light incident surface portion;
A light exit surface that emits light reflected by the light reflector surface; and
A light flux controlling member having
The light incident surface portion is
The light beam control member is formed on the back side facing the light emitting element, and the optical axis is the direction in which the light at the center of the three-dimensional outgoing light beam from the light emitting element travels. Arranged so as to be centered and opposed to the light emitting element,
A first light incident surface portion for entering a first light flux portion that is a central light flux portion located in the vicinity of the optical axis of the emitted light flux;
A direction in which the light traveling direction of the second light beam portion, which is disposed so as to surround the first light incident surface portion and is positioned so as to surround the first light beam portion of the emitted light beam, is substantially along the optical axis. A second light incident surface portion that changes the optical path so as to be incident on the light flux controlling member, and
The light reflecting surface portion is
A tapered surface that forms a tapered recess that is recessed from the top surface facing the back surface of the light flux controlling member toward the back surface, the tapered surface being a rotationally symmetric surface about the optical axis And
The light incident from the first light incident surface portion and the second light incident surface portion is totally reflected toward the light emitting surface portion;
The light exit surface portion is
A cylindrical surface connecting the top surface and the back surface, the cylindrical surface centered on the optical axis;
-When the direction orthogonal to the optical axis is the side, the light totally reflected by the light reflecting surface portion is emitted toward the side,
The second light incident surface portion, Ri Fresnel lens der comprising a plurality of projections formed to project concentrically around the optical axis,
The top surface is formed in a ring shape around the light reflecting surface portion, and is roughened so as not to generate a ring-shaped light band by diffusing light leaking from the ring-shaped top surface. ,
A light flux controlling member characterized by the above.
基板上に設置された発光素子と、前記請求項に記載の光束制御部材とを有し、 前記光束制御部材の中心軸が前記光軸と同心に配置されてなる、
ことを特徴とする発光装置。
A light-emitting element installed on a substrate; and the light flux controlling member according to claim 1 , wherein a central axis of the light flux controlling member is disposed concentrically with the optical axis.
A light emitting device characterized by that.
前記請求項に記載の発光装置と、この発光装置から出射した光を反射する反射部材と、この反射部材で反射された光で面状に照明される被照明部材と、を備えたことを特徴とする面光源装置。 The light-emitting device according to claim 2 , a reflecting member that reflects light emitted from the light-emitting device, and an illuminated member that is illuminated in a planar shape by the light reflected by the reflecting member. A characteristic surface light source device.
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WO2016181789A1 (en) * 2015-05-08 2016-11-17 株式会社エンプラス Light beam control member, light-emitting device, and illumination device
JP6689590B2 (en) * 2015-05-08 2020-04-28 株式会社エンプラス Light flux control member, light emitting device, and lighting device
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