JP2009152142A - Light-emitting element unit, and surface light-emitting unit equipped with a plurality of these - Google Patents

Light-emitting element unit, and surface light-emitting unit equipped with a plurality of these Download PDF

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JP2009152142A
JP2009152142A JP2007330843A JP2007330843A JP2009152142A JP 2009152142 A JP2009152142 A JP 2009152142A JP 2007330843 A JP2007330843 A JP 2007330843A JP 2007330843 A JP2007330843 A JP 2007330843A JP 2009152142 A JP2009152142 A JP 2009152142A
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light
light emitting
emitting element
incident
face
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Minoru Sakauchi
稔 坂内
Takashi Osugi
隆 大杉
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Panasonic Electric Works Co Ltd
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Panasonic Electric Works Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/484—Connecting portions
    • H01L2224/48463—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond
    • H01L2224/48465—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/49—Structure, shape, material or disposition of the wire connectors after the connecting process of a plurality of wire connectors
    • H01L2224/491—Disposition
    • H01L2224/49105—Connecting at different heights
    • H01L2224/49107—Connecting at different heights on the semiconductor or solid-state body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732—Location after the connecting process
    • H01L2224/73251—Location after the connecting process on different surfaces
    • H01L2224/73265—Layer and wire connectors

Abstract

<P>PROBLEM TO BE SOLVED: To make an illuminated face have high brightness, and make light distribution of an emitted light have a wide angle in a light-emitting element unit. <P>SOLUTION: The light-emitting element unit 1 is equipped with the light-emitting element (LED 2), and a lens part 5 to control light distribution of light from the LED 2. The lens part 5 has an incident face 51 to make the light from the LED 2 incident, and an emission face 53 to diffuse and emit the light incident from the incident face 51. The emission face 53 consists of a combination of: an outer shape 53a of a convex rotating body formed by rotating a circle C1 having a center outside the light-emitting face center PO around the normal line X passing through the center PO as the rotation axis; and a hemispherical recessed shape 53b having a point on the normal line X upward the light-emitting face as the center. The incident face 51 is composed of the hemispherical recessed shape having the light-emitting face center PO as the center. Since the light from the LED 2 is made incident into the lens part 5 without totally reflected in the incident face 51, light utilization efficiency is improved, and the illuminated face can be made to have high brightness. Moreover, the emitted light refracted in the incident face 51 and the emitting face 53 becomes to have a wide angle light distribution. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、広告、案内、店舗等の看板を標示する表示装置等の内部に設置される発光素子ユニット及びこれを複数備えた面発光ユニットに関する。   The present invention relates to a light emitting element unit installed inside a display device or the like that displays a signboard such as an advertisement, a guide, or a store, and a surface light emitting unit including a plurality of the light emitting element units.

従来から、広告、標識又は店舗等の看板を標示する表示装置等の内部には、光源の発光素子としてＬＥＤが用いられている。しかし、ＬＥＤが出射する光は指向性が高いので、この種の表示装置の光源としてＬＥＤが用いられると、その発光面に対して垂直な方向にのみ光が照射され、表示装置の照射面において光ムラが生じる。特に、近年はＬＥＤの高輝度出力型が普及したことに伴い、照射面における光ムラが顕著になり易い。   2. Description of the Related Art Conventionally, LEDs are used as light emitting elements of light sources inside displays such as advertisements, signs or signs for shops. However, since the light emitted from the LED has high directivity, when the LED is used as a light source of this type of display device, light is irradiated only in a direction perpendicular to the light emitting surface, and on the irradiation surface of the display device. Light unevenness occurs. In particular, with the recent widespread use of high-luminance output types of LEDs, light unevenness on the irradiated surface tends to become noticeable.

そこで、ＬＥＤを用いた表示装置等には、ＬＥＤからの光の配光を広角にするレンズ部を備え、表示装置の照射面に均質な光が照射されるように構成された発光素子ユニットが用いられる（例えば、特許文献１参照）。この種の発光素子ユニットの例を図９（ａ）に示す。発光素子ユニット１０１は、ＬＥＤ１０２が実装されたパッケージボディ１０３と、ＬＥＤ１０２から出射される光を屈折させて外部に出射する略凸型のレンズ部１０５とを備え、レンズ部１０５は、パッケージボディ１０３の上部が凹型部に形成される。なお、図中の二点鎖線は、ＬＥＤ１０２の発光面の略中心を通る法線Ｘを示す。凹型部に入射した光は、レンズ部１０５の外方へ屈折してレンズ外へ出射されるので、発光素子ユニット１０１は出射光の配向を広角にすることができる。
特開２００７−９６３１８号公報 Therefore, a display device using an LED includes a light emitting element unit that includes a lens unit that widens the light distribution from the LED and is configured to irradiate the irradiation surface of the display device with uniform light. Used (see, for example, Patent Document 1). An example of this type of light emitting element unit is shown in FIG. The light emitting element unit 101 includes a package body 103 on which the LED 102 is mounted, and a substantially convex lens unit 105 that refracts light emitted from the LED 102 and emits the light to the outside. The upper part is formed as a concave part. In addition, the dashed-two dotted line in a figure shows the normal line X which passes along the approximate center of the light emission surface of LED102. Since the light incident on the concave part is refracted outward from the lens part 105 and emitted outside the lens, the light emitting element unit 101 can make the orientation of the emitted light wide angle.
JP 2007-96318 A

しかしながら、特許文献１に示される発光素子ユニット１０１では、ＬＥＤ１０２からの光は、レンズ部１０５の内側面（入射面）で反射されてレンズ外へ出射されないことがあり、その一部は損失してしまう。特に、レンズ上部に形成された凹型部周辺における屈折によって光が中央部に集中し、光の利用効率が悪くなる。そのため、この発光素子ユニット１０１が表示装置等に用いられても、照射面の輝度を十分に高くすることはできない。   However, in the light emitting element unit 101 disclosed in Patent Document 1, the light from the LED 102 may be reflected by the inner surface (incident surface) of the lens unit 105 and may not be emitted outside the lens, and a part of the light is lost. End up. In particular, the light is concentrated at the center due to refraction around the concave portion formed in the upper part of the lens, and the light use efficiency is deteriorated. Therefore, even when the light emitting element unit 101 is used for a display device or the like, the luminance of the irradiated surface cannot be sufficiently increased.

図９（ｂ）は、図９（ａ）に示した発光素子ユニット１０１の配光曲線Ａを示す。同図に示されるように、レンズ部１０５は、ＬＥＤ１０２の法線Ｘ方向よりも広い範囲に光を照射できるが、表示装置等に要求される広角配向を実現しているとは言えない。表示装置等には、通常、複数の発光ユニットが所定間隔で配置されるが、各発光ユニットの配光が狭角であると、夫々の発光ユニットの前方にスポット的な光が出射され、照射面全体として光ムラが生じる。   FIG. 9B shows a light distribution curve A of the light emitting element unit 101 shown in FIG. As shown in the figure, the lens unit 105 can irradiate light in a wider range than the normal X direction of the LED 102, but it cannot be said that the wide-angle orientation required for a display device or the like is realized. In a display device or the like, usually, a plurality of light emitting units are arranged at a predetermined interval. However, if the light distribution of each light emitting unit is narrow, spot light is emitted in front of each light emitting unit and irradiated. Light unevenness occurs on the entire surface.

本発明は、上記課題を解決するものであり、表示装置等に用いられたとき、光の利用効率が高く、照射面の輝度を高くすることができ、しかも出射光の配光を広角にすることができる発光素子ユニット及びこれを複数備えた面発光ユニットを提供することを目的とする。   The present invention solves the above-described problems, and when used in a display device or the like, the light use efficiency is high, the luminance of the irradiated surface can be increased, and the light distribution of the emitted light is widened. An object of the present invention is to provide a light emitting element unit that can be used and a surface light emitting unit including a plurality of the light emitting element units.

上記課題を解決するため、請求項１の発明は、発光素子と、前記発光素子を実装するパッケージと、前記パッケージを搭載する基板と、前記発光素子から出射された光を配光制御するレンズ部と、を備えた発光素子ユニットであって、前記レンズ部は、前記発光素子からの光を入射する入射面と、前記入射面の周囲に設けられ、前記基板と接する底面と、前記入射面から入射した光を拡散出射する出射面と、を有し、前記出射面は、前記発光素子の発光面中心よりも外側を中心とする円を、前記発光面中心を通る法線を軸として回転させた凸型回転体の外郭形状と、前記発光面より上方であって、前記発光面中心を通る法線上の点を中心とした半球型凹形状との組み合わせから成る概半球形状から成り、前記入射面は、前記発光面中心を中心とする半球型凹形状から成るものである。   In order to solve the above problems, the invention of claim 1 is a light-emitting element, a package for mounting the light-emitting element, a substrate for mounting the package, and a lens unit for controlling light distribution from the light-emitting element. The lens unit includes an incident surface on which light from the light emitting element is incident, a bottom surface provided around the incident surface and in contact with the substrate, and the incident surface. An exit surface that diffuses and emits incident light, and the exit surface rotates a circle centered on the outside of the center of the light emitting surface of the light emitting element with a normal passing through the center of the light emitting surface as an axis. And a substantially hemispherical shape composed of a combination of an outer shape of the convex rotating body and a hemispherical concave shape centered on a point on the normal line passing through the light emitting surface center and above the light emitting surface. The surface is centered on the light emitting surface center It is made of a hemispherical concave shape which.

請求項２の発明は、請求項１に記載の発光素子ユニットにおいて、前記パッケージは、前記発光素子を実装させる母体と、前記発光素子を電気的に連結させるリード線と、前記発光素子が生じる熱を放熱するための金属材及び樹脂材から成る放熱材と、を備えるものである。   According to a second aspect of the present invention, in the light emitting element unit according to the first aspect, the package includes a mother body on which the light emitting element is mounted, a lead wire that electrically connects the light emitting element, and heat generated by the light emitting element. And a heat dissipating material made of a metal material and a resin material.

請求項３の発明は、請求項１又は請求項２に記載の発光素子ユニットにおいて、前記入射面と前記パッケージとの間には樹脂材料が充填されるものである。   According to a third aspect of the present invention, in the light emitting element unit according to the first or second aspect, a resin material is filled between the incident surface and the package.

請求項４の発明は、請求項１に記載の請求項１乃至請求項３のいずれか一項に記載の発光素子ユニットを複数個並べて設置した面発光ユニットである。   A fourth aspect of the present invention is a surface light emitting unit in which a plurality of the light emitting element units according to any one of the first to third aspects of the present invention are arranged side by side.

請求項１の発明によれば、ＬＥＤから出射した光は、入射面において全反射されることなく、レンズ部内に入射するので、光の利用効率が高く、照射面の輝度を高くすることができる。また、ＬＥＤからの光はレンズ部に入射するときに入射面において屈折され、出射面から出射するときに発光面上部に形成された半球型凹形状、及びその周囲に形成された凸型回転体の外郭形状によって更に屈折させるので、出射光の配光を広角にすることができる。   According to the first aspect of the present invention, since the light emitted from the LED enters the lens unit without being totally reflected on the incident surface, the light utilization efficiency is high and the luminance of the irradiation surface can be increased. . Further, light from the LED is refracted at the incident surface when entering the lens unit, and is formed at the upper part of the light emitting surface when exiting from the exit surface, and a convex rotator formed around the hemispherical concave shape. Since the light is further refracted by the outer shape, the light distribution of the emitted light can be widened.

請求項２の発明によれば、ＬＥＤを直接的に基板に実装させるよりも安定なＬＥＤの動作環境が得られる。   According to the invention of claim 2, a more stable operating environment of the LED can be obtained than when the LED is directly mounted on the substrate.

請求項３の発明によれば、発光素子が実装されたパッケージとレンズ部との位置決めを確実に行うことができる。   According to the invention of claim 3, the positioning of the lens unit and the package on which the light emitting element is mounted can be performed reliably.

請求項４の発明によれば、単体の発光素子ユニットの正面方向に光が出射されなくても、その発光素子ユニットの周囲に配置された他の発光素子ユニットから広角配光の光が出射されるので、光ムラのない均一な照射面を実現することができる。また、発光素子ユニットは、高輝度かつ広角配光が可能であるので、少数の発光素子ユニットを用いて、広い面積を均一に照射することができるので、製造コストを抑え、省エネ化を実現した面発光ユニットが得られる。   According to the invention of claim 4, even if light is not emitted in the front direction of a single light emitting element unit, light of wide-angle light distribution is emitted from other light emitting element units arranged around the light emitting element unit. Therefore, a uniform irradiation surface without light unevenness can be realized. In addition, since the light emitting element unit is capable of high brightness and wide-angle light distribution, it is possible to uniformly irradiate a wide area using a small number of light emitting element units, thereby reducing manufacturing costs and realizing energy saving. A surface emitting unit is obtained.

本発明の第１の実施形態に係る発光素子ユニットについて、図１（ａ）（ｂ）及び図２を参照して説明する。本実施形態の発光素子ユニット１（以下、発光ユニットという）は、発光素子としてのＬＥＤ２と、このＬＥＤ２を実装するパッケージ３と、パッケージ３を搭載する基板４と、ＬＥＤ２から出射された光を配光制御するレンズ部５と、を備える。レンズ部５は、ＬＥＤ２からの光を入射する入射面５１と、入射面５１の周囲に設けられて基板４と接する底面５２と、入射面５１から入射した光を拡散出射する出射面５３と、を有する。また、発光ユニット１は、基板４及びレンズ部５等を収納するケース６を適宜に備える。なお、図２ではケース６の図示を省略している。   The light emitting element unit according to the first embodiment of the present invention will be described with reference to FIGS. A light emitting element unit 1 (hereinafter referred to as a light emitting unit) of the present embodiment distributes an LED 2 as a light emitting element, a package 3 on which the LED 2 is mounted, a substrate 4 on which the package 3 is mounted, and light emitted from the LED 2. A lens unit 5 for optical control. The lens unit 5 includes an incident surface 51 on which light from the LED 2 is incident, a bottom surface 52 provided around the incident surface 51 and in contact with the substrate 4, an exit surface 53 that diffuses and emits light incident from the incident surface 51, Have In addition, the light emitting unit 1 appropriately includes a case 6 that houses the substrate 4, the lens unit 5, and the like. In addition, illustration of case 6 is abbreviate | omitted in FIG.

ＬＥＤ２には、汎用の発光ダイオード（ＬＥＤ）が用いられる。可視光を発生させ、レンズ部５の全体の容量と比較して十分に小さければ、必ずしもＬＥＤに限られず、例えば、小型白熱灯、小型のハロゲン電球等も適用可能である。基板４は、汎用のプリント基板であり、寸法安定性に優れ、反りやねじれ等のバラツキの少ない基板が用いられる。基板４の材料としては、例えば、フェノール樹脂を含浸させた紙基材に銅を積層した紙基材銅張積層板が用いられる。レンズ部５は、アクリル樹脂、ポリカーボネート又はガラス等の透光性材料から形成される。ケース６は、金属又は樹脂から成る材料をレンズ部５の外周に適合するように形成される。好ましくは、ケース６のうち、レンズ部５と向かい合う面は、反射面又は拡散反射面として形成される。   A general-purpose light emitting diode (LED) is used for the LED 2. If visible light is generated and is sufficiently small as compared with the entire capacity of the lens unit 5, the present invention is not necessarily limited to the LED, and for example, a small incandescent lamp, a small halogen light bulb, and the like are also applicable. The substrate 4 is a general-purpose printed circuit board, and is a substrate that is excellent in dimensional stability and has little variation such as warping and twisting. As the material of the substrate 4, for example, a paper base copper-clad laminate in which copper is laminated on a paper base impregnated with a phenol resin is used. The lens unit 5 is formed from a translucent material such as acrylic resin, polycarbonate, or glass. The case 6 is formed so that a material made of metal or resin is fitted to the outer periphery of the lens unit 5. Preferably, the surface of the case 6 that faces the lens unit 5 is formed as a reflection surface or a diffuse reflection surface.

基板４は、支持体７によってケース６及び発光ユニット１が適用される機器の取付面（図示せず）に固定される。また、発光ユニット１は、外部からの給電を受けるための電極８が、基板４及び支持体７を貫通するように設けられる。電極８は、基板４に設けられた配線（図示せず）を介してパッケージ３に実装されたＬＥＤ２へ給電する。支持体７には適宜に放熱材７０が用いられる。   The substrate 4 is fixed to a mounting surface (not shown) of a device to which the case 6 and the light emitting unit 1 are applied by the support 7. Further, the light emitting unit 1 is provided with an electrode 8 for receiving power from the outside so as to penetrate the substrate 4 and the support 7. The electrode 8 supplies power to the LED 2 mounted on the package 3 via wiring (not shown) provided on the substrate 4. A heat dissipation material 70 is appropriately used for the support 7.

好ましくは、レンズ部５の入射面５１とパッケージ３との間には透光性の樹脂材料９が充填される。こうすれば、ＬＥＤ２が実装されたパッケージ３とレンズ部５との位置決めを確実に行うことができる。   Preferably, a light-transmitting resin material 9 is filled between the incident surface 51 of the lens unit 5 and the package 3. If it carries out like this, positioning with the lens 3 and the package 3 in which LED2 was mounted can be performed reliably.

次に、パッケージ３の具体的な構成について、図３を参照して説明する。パッケージ３は、ＬＥＤ２を実装させる母体３１と、ＬＥＤ２を電気的に連結させるリード線３２と、ＬＥＤ２が生じる熱を放熱するための金属材料及び樹脂材料から成る放熱材３３と、これらを収納し、上面に凹部を有するカップ３４とを備える。また、カップ３４の凹部にはシリコーン樹脂等の透明樹脂３５が充填される。母体３１は、カップ３４及び放熱材３３と一体的に形成されていてもよい。リード線３２は、母体３１上にプリントされていてもよく、少なくとも、基板４に設けられた配線を介してＬＥＤ２に給電可能なように構成されていればよい。ＬＥＤ２は、直接的に基板４に実装されてもよいが、パッケージ３を介することにより、より安定な動作環境が得られる。   Next, a specific configuration of the package 3 will be described with reference to FIG. The package 3 houses a base 31 on which the LED 2 is mounted, a lead wire 32 that electrically connects the LED 2, a heat radiating material 33 made of a metal material and a resin material for radiating heat generated by the LED 2, And a cup 34 having a recess on the upper surface. Further, the concave portion of the cup 34 is filled with a transparent resin 35 such as a silicone resin. The base 31 may be formed integrally with the cup 34 and the heat dissipation material 33. The lead wire 32 may be printed on the base 31 and may be configured so that power can be supplied to the LED 2 via at least the wiring provided on the substrate 4. The LED 2 may be directly mounted on the substrate 4, but a more stable operating environment can be obtained through the package 3.

レンズ部５の出射面５３及び入射面５１の具体的な構成について、図４を参照して説明する。出射面５３は、ＬＥＤ２の発光面中心Ｐ０よりも外側の点Ｐａを中心とする円Ｃａを、発光面中心Ｐ０を通る法線Ｘを軸として回転させた凸型回転体の外郭形状５３ａと、発光面中心Ｐ０より上方であって、法線Ｘ上の点Ｐｂを中心とする円Ｃｂに沿う半球型凹形状５３ｂとの組み合わせから成る概半球形状から成る。円Ｃａの半径ｒａは、発光面中心Ｐ０と外側を中心Ｐａとする円Ｃａの中心Ｐａとの距離ｄａよりも大きく設定される。また、入射面５１は、発光面中心Ｐ０を起点とする円Ｃ０を回転させた半球型凹状から成る。この入射面５１は、ＬＥＤ２の近傍に形成され、入射面５１から出射面５３にかけてのレンズ部５の厚みは、従来例のレンズ部（図９（ａ）参照）に比べて厚くなるよう形成される。   A specific configuration of the exit surface 53 and the entrance surface 51 of the lens unit 5 will be described with reference to FIG. The emission surface 53 is a convex rotating body outer shape 53a obtained by rotating a circle Ca centered on a point Pa outside the light emitting surface center P0 of the LED 2 around the normal line X passing through the light emitting surface center P0. It has a substantially hemispherical shape composed of a combination with a hemispherical concave shape 53b along a circle Cb centered on a point Pb on the normal line X above the light emitting surface center P0. The radius ra of the circle Ca is set to be larger than the distance da between the light emitting surface center P0 and the center Pa of the circle Ca centered on the outside. The incident surface 51 is formed of a hemispherical concave shape obtained by rotating a circle C0 starting from the light emitting surface center P0. The entrance surface 51 is formed in the vicinity of the LED 2, and the thickness of the lens unit 5 from the entrance surface 51 to the exit surface 53 is formed to be thicker than that of the conventional lens unit (see FIG. 9A). The

上述したレンズ部５を備えた発光ユニット１の作用について、上述した図４に加え図５及び図６を参照して説明する。まず、光の屈折現象について簡単に説明する。光が屈折率の高い材質から低い材質へ伝播するとき、光の入射角度によって透過する場合と全反射する場合とがあり、この光が透過するか全反射するかの境になる入射角度を臨界角という。入射角度が臨界角に満たない場合、屈折率の高い材質と低い材質との接面において、光は透過屈折し、一方、臨界角を超える場合には全反射する。例えば、入射側物質が空気（ｎ＝１）であり、レンズ部５の材質がアクリル（ｎ＝１．４９）であるとき、臨界角は４２．１６°となる。   The operation of the light emitting unit 1 including the lens unit 5 will be described with reference to FIGS. 5 and 6 in addition to FIG. 4 described above. First, the light refraction phenomenon will be briefly described. When light propagates from a material with a high refractive index to a material with a low refractive index, there are cases where light is transmitted depending on the incident angle of light and there is a case where the light is totally reflected. It is called a corner. When the incident angle is less than the critical angle, the light is transmitted and refracted at the contact surface between the material having a high refractive index and the material having a low refractive index, whereas when the incident angle exceeds the critical angle, the light is totally reflected. For example, when the incident side substance is air (n = 1) and the material of the lens unit 5 is acrylic (n = 1.49), the critical angle is 42.16 °.

本実施形態においては、レンズ部５の入射面５１は、ＬＥＤ２の発光面中心Ｐ０を起点とする半球型凹形状に形成されるので、ＬＥＤ２から出射光は、入射面５１のいずれの面に対しても、ほぼ垂直に入射面５１に入射する。すなわち、入射角は０°に近く、ＬＥＤ２から出射された光は、入射面５１において全反射されることなく、レンズ部５内に入射する。従来のレンズでは、入射面において光が反射され、この光が外部に出射されないことにより、利用効率が低下することがあった。これに対して、本実施形態のレンズ部５は、ＬＥＤ２からの光を反射しないので、光の利用効率が高く、照射面の輝度を高くすることができる。   In the present embodiment, since the incident surface 51 of the lens unit 5 is formed in a hemispherical concave shape starting from the light emitting surface center P0 of the LED 2, the emitted light from the LED 2 is incident on any surface of the incident surface 51. However, the light is incident on the incident surface 51 almost vertically. That is, the incident angle is close to 0 °, and the light emitted from the LED 2 enters the lens unit 5 without being totally reflected at the incident surface 51. In the conventional lens, the light is reflected on the incident surface and the light is not emitted to the outside, so that the utilization efficiency may be lowered. On the other hand, since the lens part 5 of this embodiment does not reflect the light from LED2, the utilization efficiency of light is high and the brightness | luminance of an irradiation surface can be made high.

レンズ部５は、ＬＥＤ２からの光を、入射面５１の界面で屈折させた後、出射面５３の発光面上部に形成された半球型凹形状５３ｂ、及びその周囲に形成された凸型回転体の外郭形状５３ａによって更に屈折させるので、図５の矢印線で示したように、出射光の配光を広角にすることができる。図６は、上述のレンズ部５による配光曲線Ｂを示す。この配光パターンは、浅く広く、いわゆるバットウィング形状と呼ばれ、ＬＥＤ２の正面方向にはほとんど光が出ない一方で、その周囲に多くの光が出るので、照射面においては、リング状の光が照射される。   The lens unit 5 refracts light from the LED 2 at the interface of the incident surface 51, and then forms a hemispherical concave shape 53b formed on the light emitting surface of the light emitting surface 53, and a convex rotator formed around the hemispherical concave shape 53b. Since the light is further refracted by the outer shape 53a, the light distribution of the emitted light can be widened as shown by the arrow line in FIG. FIG. 6 shows a light distribution curve B by the lens unit 5 described above. This light distribution pattern is shallow and wide, and is called a so-called batwing shape. While light is hardly emitted in the front direction of the LED 2, much light is emitted around the LED 2. Is irradiated.

比較例として、半球型凹形状の入射面５１が形成されていないレンズ部２０５及びこのレンズ部２０５を備えた発光ユニット２０１による配光曲線Ｃを図７（ａ）（ｂ）に示す。この比較例においては、ほとんどの光がＬＥＤ２０２の中心を通る軸Ｘの近くに配光され、本実施形態の発光ユニット１のような広角配光が得られない。この結果は、半球型凹形状に形成された入射面５１が、ＬＥＤ２からの光の利用効率を向上させるだけでなく、配光の広角化にも寄与することを示す。   As a comparative example, FIGS. 7A and 7B show a light distribution curve C by the lens unit 205 in which the hemispherical concave incident surface 51 is not formed and the light emitting unit 201 provided with the lens unit 205. In this comparative example, most of the light is distributed near the axis X passing through the center of the LED 202, and the wide-angle light distribution as in the light emitting unit 1 of the present embodiment cannot be obtained. This result shows that the incident surface 51 formed in a hemispherical concave shape not only improves the utilization efficiency of light from the LED 2, but also contributes to widening of the light distribution.

次に、上述した発光ユニット１を複数備えた面発光ユニットについて、図８（ａ）（ｂ）を参照して説明する。面発光ユニット１０は、複数個の発光ユニット１が取付板１１に等間隔に配置され、夫々の発光ユニット１が配線１２を介して電気制御装置１３に接続される。これら取付板１１等は筐体１４に収納される。各発光ユニット１は、電気制御装置１３からの制御信号に基づいて点灯動作する。   Next, a surface light emitting unit including a plurality of the light emitting units 1 described above will be described with reference to FIGS. In the surface light emitting unit 10, a plurality of light emitting units 1 are arranged on the mounting plate 11 at equal intervals, and each light emitting unit 1 is connected to the electric control device 13 via a wiring 12. These mounting plates 11 and the like are housed in a housing 14. Each light emitting unit 1 is lit based on a control signal from the electric control device 13.

単体の発光ユニット１は、広範囲に光を照射できるが、正面方向への光量が少ないので、例えば、照射面がレンズ部５から近いと、光ムラを生じることがある。しかし、複数個の発光ユニット１が等間隔に配置されると、単体の発光ユニット１の正面方向に光が出射されなくても、その発光ユニット１の周囲に配置された他の発光ユニット１から広角配光の光が出射されるので、光ムラのない均一な照射面を実現することができる。また、本実施形態の発光ユニット１は、高輝度かつ広角配光が可能であり、少数の発光ユニット１を用いて、広い面積を均一に照射することができるので、面発光ユニット１０の製造コストを抑えることができ、また、省エネ化を実現することもできる。   The single light emitting unit 1 can irradiate light over a wide range, but since the amount of light in the front direction is small, for example, if the irradiation surface is close to the lens unit 5, light unevenness may occur. However, when a plurality of light emitting units 1 are arranged at equal intervals, even if light is not emitted in the front direction of the single light emitting unit 1, from other light emitting units 1 arranged around the light emitting unit 1. Since light with a wide-angle light distribution is emitted, a uniform irradiation surface without light unevenness can be realized. In addition, the light emitting unit 1 of the present embodiment is capable of high luminance and wide-angle light distribution, and can irradiate a wide area uniformly using a small number of light emitting units 1. Can be suppressed, and energy saving can be realized.

なお、本発明は、図４に示したように、レンズ部５の入射面５１がＬＥＤ２の発光面中心Ｐ０を起点とする半球型凹形状に形成されていることにより、ＬＥＤ２からの光を全反射させることなくレンズ部５内に導入して、光利用効率を高めるように構成されていれば、他の部分の形状は必ずしも上記実施形態で示した構成に限られない。   In the present invention, as shown in FIG. 4, the light incident surface 51 of the lens unit 5 is formed in a hemispherical concave shape starting from the light emitting surface center P0 of the LED 2, so that the light from the LED 2 is entirely As long as the light is introduced into the lens unit 5 without being reflected to increase the light utilization efficiency, the shape of the other parts is not necessarily limited to the configuration shown in the above embodiment.

（ａ）は本発明の一実施形態に係る発光素子ユニットの斜視図、（ｂ）は同側断面図。(A) is a perspective view of the light emitting element unit which concerns on one Embodiment of this invention, (b) is the same sectional side view. 同発光素子ユニットの側断面図。The sectional side view of the light emitting element unit. 同発光素子ユニットに備えられるパッケージの側断面図。The sectional side view of the package with which the light emitting element unit is equipped. 同発光素子ユニットに備えられるレンズ部の側断面図。The sectional side view of the lens part with which the light emitting element unit is equipped. 同発光素子ユニットの動作を示す側断面図。The sectional side view which shows operation | movement of the light emitting element unit. 同発光素子ユニットの配光曲線を示す図。The figure which shows the light distribution curve of the light emitting element unit. （ａ）は比較例の発光素子ユニットの側断面図、（ｂ）は同発光素子ユニットに用いられるレンズ部による配光曲線を示す図。(A) is a sectional side view of a light emitting element unit of a comparative example, (b) is a diagram showing a light distribution curve by a lens portion used in the light emitting element unit. （ａ）は本発明の発光素子ユニットを備えた面発光ユニットの斜視図、（ｂ）は同側断面図。(A) is a perspective view of the surface emitting unit provided with the light emitting element unit of this invention, (b) is the same sectional side view. （ａ）は従来の発光素子ユニットの側断面図、（ｂ）は同発光素子ユニットに用いられるレンズ部による配光曲線を示す図。(A) is a sectional side view of a conventional light emitting element unit, (b) is a diagram showing a light distribution curve by a lens portion used in the light emitting element unit.

符号の説明Explanation of symbols

１ 発光ユニット（発光素子ユニット）
２ ＬＥＤ（発光素子）
３ パッケージ
４ 基板
５ レンズ部
５１ 入射面
５２ 底面
５３ 出射面
９ 樹脂材料
１０ 面発光ユニット
Ｐ０ 発光素子の発光面中心
Ｐａ 発光面中心よりも外側の点
Ｐｂ 発光面中心より上方であって、その法線上の点
Ｃａ Ｐａを中心とする円
Ｃｂ Ｐｂを中心とする円
Ｘ Ｐ０を通る法線 1 Light emitting unit (light emitting element unit)
2 LED (light emitting element)
3 Package 4 Substrate 5 Lens portion 51 Incident surface 52 Bottom surface 53 Emission surface 9 Resin material 10 Surface light emitting unit P0 Light emitting surface center of light emitting element Pa Point outside light emitting surface center Pb Above light emitting surface center and its method A point on the line A circle centered on Ca Pa A circle centered on Cb Pb X A normal passing through P0

Claims (4)

発光素子と、前記発光素子を実装するパッケージと、前記パッケージを搭載する基板と、前記発光素子から出射された光を配光制御するレンズ部と、を備えた発光素子ユニットであって、
前記レンズ部は、前記発光素子からの光を入射する入射面と、前記入射面の周囲に設けられ、前記基板と接する底面と、前記入射面から入射した光を拡散出射する出射面と、を有し、
前記出射面は、前記発光素子の発光面中心よりも外側を中心とする円を、前記発光面中心を通る法線を軸として回転させた凸型回転体の外郭形状と、前記発光面より上方であって、前記発光面中心を通る法線上の点を中心とした半球型凹形状との組み合わせから成る概半球形状から成り、
前記入射面は、前記発光面中心を中心とする半球型凹形状から成ることを特徴とする発光素子ユニット。 A light emitting element unit comprising: a light emitting element; a package for mounting the light emitting element; a substrate on which the package is mounted; and a lens unit for controlling light distribution of light emitted from the light emitting element.
The lens unit includes an incident surface on which light from the light emitting element is incident, a bottom surface provided around the incident surface and in contact with the substrate, and an exit surface that diffuses and emits light incident from the incident surface. Have
The exit surface has a contour shape of a convex rotating body in which a circle centered on the outside of the light emitting surface center of the light emitting element is rotated about a normal passing through the center of the light emitting surface, and above the light emitting surface. And consisting of a substantially hemispherical shape consisting of a combination with a hemispherical concave shape centered on a point on the normal passing through the light emitting surface center,
The light-emitting element unit, wherein the incident surface has a hemispherical concave shape centered on the light-emitting surface center. 前記パッケージは、前記発光素子を実装させる母体と、前記発光素子を電気的に連結させるリード線と、前記発光素子が生じる熱を放熱するための金属材及び樹脂材から成る放熱材と、を備えることを特徴とする請求項１に記載の発光素子ユニット。   The package includes a base on which the light emitting element is mounted, a lead wire that electrically connects the light emitting element, and a heat radiating material made of a metal material and a resin material for radiating heat generated by the light emitting element. The light emitting element unit according to claim 1. 前記入射面と前記パッケージとの間には樹脂材料が充填されることを特徴とする請求項１又は請求項２に記載の発光素子ユニット。   The light emitting element unit according to claim 1, wherein a resin material is filled between the incident surface and the package. 請求項１乃至請求項３のいずれか一項に記載の発光素子ユニットを複数個並べて設置したことを特徴とする面発光ユニット。   A surface light emitting unit comprising a plurality of the light emitting element units according to claim 1 arranged side by side.
JP2007330843A 2007-12-21 2007-12-21 Light-emitting element unit, and surface light-emitting unit equipped with a plurality of these Pending JP2009152142A (en)

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