JP2012033851A - Light-emitting diode - Google Patents

Light-emitting diode Download PDF

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JP2012033851A
JP2012033851A JP2010284708A JP2010284708A JP2012033851A JP 2012033851 A JP2012033851 A JP 2012033851A JP 2010284708 A JP2010284708 A JP 2010284708A JP 2010284708 A JP2010284708 A JP 2010284708A JP 2012033851 A JP2012033851 A JP 2012033851A
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light
emitting diode
nonwoven fabric
led
led chip
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Akihito Raikubo
彰人 雷久保
Akihiro Kato
陽弘 加藤
Masaharu Wakatsuki
雅晴 若月
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Okaya Electric Industry Co Ltd
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Okaya Electric Industry 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
    • H01L2224/481—Disposition
    • H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
    • H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item

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Abstract

PROBLEM TO BE SOLVED: To provide an light-emitting diode having a wide angle of visibility which is visible not only from a front direction but also from side and rear directions and is composed of an light-emitting diode chip in a recess.SOLUTION: An LED 10 comprises: an LED chip 20 placed in a recess 17; a simplified ring-shaped frame member 14 which surrounds the LED chip 20 and is higher than the LED chip 20 in height; and a disk-like nonwoven fabric 28 that supports a fluorescent material 26 on a top surface 14b of the frame member 14. In addition, a side peripheral face 28a of the nonwoven fabric 28 is exposed.

Description

この発明は、凹部内に発光ダイオードチップ（ＬＥＤチップ）を配置して成る発光ダイオード（ＬＥＤ）に係り、特に、前方向だけでなく側方向や後方向からも視認できる広視野角な発光ダイオードに関する。   The present invention relates to a light emitting diode (LED) in which a light emitting diode chip (LED chip) is disposed in a recess, and more particularly to a light emitting diode having a wide viewing angle that can be viewed not only in the front direction but also in the lateral direction and the rear direction. .

凹部内に発光ダイオードチップを配置して成る発光ダイオードとして、本出願人は先に、特開２０１０−３７８８号を提案した。
図１２に示すように、この発光ダイオード60は、略リング状の枠部材64と、第１のリードフレーム66及び第２のリードフレーム68を有している。 The present applicant has previously proposed Japanese Patent Application Laid-Open No. 2010-3788 as a light-emitting diode having a light-emitting diode chip disposed in a recess.
As shown in FIG. 12, the light emitting diode 60 includes a substantially ring-shaped frame member 64, a first lead frame 66, and a second lead frame 68.

上記枠部材64の底面64ａ及び底面開口を、第１のリードフレーム66の先端部66ａで覆うことにより凹部67が形成されており、該凹部67内に露出した第１のリードフレーム66の先端部66ａに、ＬＥＤチップ70をダイボンドすることにより、第１のリードフレーム66とＬＥＤチップ70底面の一方の電極（図示せず）とを電気的に接続している。第１のリードフレーム66の後端部66ｂは、枠部材64を貫通して外方へ向かって水平方向に取り出されている。
また、第２のリードフレーム68は、上記枠部材64を貫通して凹部67内に露出する先端部68ａと、枠部材64の外方へ向かって水平方向に取り出されている後端部68ｂを有しており、第２のリードフレーム68の先端部68ａと、上記ＬＥＤチップ70上面の他方の電極（図示せず）とをボンディングワイヤ72を介して電気的に接続して成る。 A concave portion 67 is formed by covering the bottom surface 64 a and the bottom surface opening of the frame member 64 with the distal end portion 66 a of the first lead frame 66, and the distal end portion of the first lead frame 66 exposed in the concave portion 67. The LED chip 70 is die-bonded to 66a, so that the first lead frame 66 and one electrode (not shown) on the bottom surface of the LED chip 70 are electrically connected. The rear end portion 66b of the first lead frame 66 passes through the frame member 64 and is taken out in the horizontal direction outward.
The second lead frame 68 includes a front end portion 68a that penetrates the frame member 64 and is exposed in the recess 67, and a rear end portion 68b that is taken out in the horizontal direction toward the outside of the frame member 64. The tip end portion 68 a of the second lead frame 68 and the other electrode (not shown) on the upper surface of the LED chip 70 are electrically connected via a bonding wire 72.

上記枠部材64の上端には、枠部材64上端の内壁を薄くして形成した段部74が形成されており、該段部74上に、蛍光体76を担持して成る円盤状の不織布78（図１３）が載置されている。
不織布78は、図１４及び図１５に示すように、多数の繊維80が立体的に絡み合って形成されるものであり、繊維80間には多数の空隙82（図１５参照）が形成されており、また、多数の繊維80が立体的に絡み合っているため、単位体積当たりの繊維80の表面積が極めて大きいものである。
図１６に示すように、蛍光体76は、不織布78を構成する繊維80の表面に被着・担持されているものである。 On the upper end of the frame member 64, a stepped portion 74 is formed by thinning the inner wall of the upper end of the frame member 64, and a disc-shaped non-woven fabric 78 formed by carrying a phosphor 76 on the stepped portion 74. (FIG. 13) is placed.
As shown in FIGS. 14 and 15, the non-woven fabric 78 is formed by tangling a large number of fibers 80, and a large number of voids 82 (see FIG. 15) are formed between the fibers 80. In addition, since a large number of fibers 80 are intertwined in three dimensions, the surface area of the fibers 80 per unit volume is extremely large.
As shown in FIG. 16, the phosphor 76 is attached and carried on the surface of the fiber 80 constituting the nonwoven fabric 78.

而して、上記第１のリードフレーム66及び第２のリードフレーム68を介してＬＥＤチップ70に電圧が印加されると、ＬＥＤチップ70が発光して、上記蛍光体76を励起させる光が放射される。この光が、ＬＥＤチップ70の上方に配置されている不織布78に担持された蛍光体76に照射され、所定波長の可視光に波長変換された後、外部へ放射されるのである。
特開２０１０−３７８８号公報 Thus, when a voltage is applied to the LED chip 70 via the first lead frame 66 and the second lead frame 68, the LED chip 70 emits light, and light that excites the phosphor 76 is emitted. Is done. This light is applied to the phosphor 76 carried on the nonwoven fabric 78 disposed above the LED chip 70, converted into visible light having a predetermined wavelength, and then emitted to the outside.
JP 2010-3788 A

上記特許文献１で提案されたＬＥＤ60は、ＬＥＤチップ24が凹部67内に配置されると共に、蛍光体76を担持した不織布78が、枠部材64の上端内壁に形成した段部74上に配置されているので、蛍光体76で波長変換されて放射される可視光は、視認方向である前方向（図１２における上方向）へ向かって放射されるものであった。
しかしながら、上記ＬＥＤ60が照明用光源として用いられる場合等においては、前方向だけでなく、側方向や後方向へも光を放射する広視野角なＬＥＤ60が求められている。 In the LED 60 proposed in Patent Document 1, the LED chip 24 is disposed in the recess 67, and the non-woven fabric 78 carrying the phosphor 76 is disposed on the stepped portion 74 formed on the upper end inner wall of the frame member 64. Therefore, the visible light emitted after being wavelength-converted by the phosphor 76 is emitted toward the front direction (upward direction in FIG. 12), which is the viewing direction.
However, when the LED 60 is used as an illumination light source, an LED 60 having a wide viewing angle that emits light not only in the forward direction but also in the lateral direction and the backward direction is required.

本発明は、上記従来の問題点に鑑みてなされたものであり、その目的は、凹部内に発光ダイオードチップを配置して成る発光ダイオードにおいて、前方向だけでなく側方向や後方向からも視認できる広視野角な発光ダイオードを実現することにある。   The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to visually recognize not only the front direction but also the side direction and the rear direction in a light emitting diode in which a light emitting diode chip is disposed in a recess. The object is to realize a light-emitting diode having a wide viewing angle.

上記の目的を達成するため、本発明の請求項１に記載の発光ダイオードは、
ＬＥＤチップを凹部内に配置して、ＬＥＤチップを該ＬＥＤチップより高さが高い部材で囲繞すると共に、上記部材の上方に、ＬＥＤチップの発光を所定波長の可視光に変換して放射する蛍光体を担持した不織布を配置して成り、さらに、上記不織布の側周面を露出させたことを特徴とする。 In order to achieve the above object, a light-emitting diode according to claim 1 of the present invention is provided.
The LED chip is disposed in the recess, and the LED chip is surrounded by a member having a height higher than that of the LED chip, and the light emitted from the LED chip is converted into visible light having a predetermined wavelength and emitted above the member. A non-woven fabric carrying a body is arranged, and the side peripheral surface of the non-woven fabric is exposed.

本発明の請求項２に記載の発光ダイオードは、請求項１に記載の発光ダイオードにおいて、
上記部材が、ＬＥＤチップを囲繞する枠部材であり、該枠部材の上面に、上記不織布を配置して成り、さらに、上記不織布の側周面を露出させたことを特徴とする。 The light-emitting diode according to claim 2 of the present invention is the light-emitting diode according to claim 1,
The member is a frame member that surrounds the LED chip. The nonwoven fabric is disposed on the upper surface of the frame member, and the side peripheral surface of the nonwoven fabric is exposed.

本発明の請求項３に記載の発光ダイオードは、請求項１又は２に記載の発光ダイオードにおいて、
上記不織布の上面に、透光性のレンズ部を形成したことを特徴とする。 The light-emitting diode according to claim 3 of the present invention is the light-emitting diode according to claim 1 or 2,
A translucent lens portion is formed on the upper surface of the nonwoven fabric.

本発明の請求項４に記載の発光ダイオードは、請求項１又は２に記載の発光ダイオードにおいて、
上記不織布を、透光性のレンズ部で封止したことを特徴とする。 The light-emitting diode according to claim 4 of the present invention is the light-emitting diode according to claim 1 or 2,
The nonwoven fabric is sealed with a translucent lens portion.

本発明の請求項５に記載の発光ダイオードは、請求項３又は４に記載の発光ダイオードにおいて、
上記レンズ部中に、光散乱材を添加したことを特徴とする。 The light-emitting diode according to claim 5 of the present invention is the light-emitting diode according to claim 3 or 4,
A light scattering material is added to the lens portion.

本発明の発光ダイオードにあっては、ＬＥＤチップを凹部内に配置して、ＬＥＤチップを該ＬＥＤチップより高さが高い部材で囲繞すると共に、上記部材の上方に蛍光体を担持して成る不織布を配置して成り、さらに、上記不織布の側周面を露出させたので、不織布の側周面近傍に担持された蛍光体から放射される可視光は、上記部材に遮られることがなく側方向や後方向を含む様々な方向へ放射されることとなり、その結果、前方向だけでなく側方向や後方向からも視認できる広視野角な発光ダイオードを実現できる。   In the light emitting diode of the present invention, the LED chip is disposed in the recess, and the LED chip is surrounded by a member having a height higher than that of the LED chip, and the phosphor is supported above the member. Furthermore, since the side peripheral surface of the nonwoven fabric is exposed, the visible light emitted from the phosphor carried in the vicinity of the side peripheral surface of the nonwoven fabric is not obstructed by the member, and is laterally directed. As a result, a light emitting diode having a wide viewing angle that can be viewed not only from the front direction but also from the side direction and the rear direction can be realized.

尚、発光ダイオードは、主として前方向の対象物に対して光を照射するものとして用いられることが多いため、広視野角な場合であっても、側方向や後方向に比べて前方向の光度の高いものが求められることも多い。
請求項３に記載の発光ダイオードの如く、請求項１又は２に記載の発光ダイオードにおいて、上記不織布の上面に、透光性のレンズ部を形成した場合には、前方向へ向かう光が、上記レンズ部で集光され、広視野角でありながら側方向や後方向に比べて前方向の光度の高い発光ダイオードが実現できる。 Since light emitting diodes are often used mainly to irradiate light on an object in the forward direction, even in the case of a wide viewing angle, the luminous intensity in the forward direction compared to the lateral direction and the backward direction. Often there is a need for a high value.
As in the light-emitting diode according to claim 3, in the light-emitting diode according to claim 1 or 2, when a translucent lens portion is formed on the upper surface of the nonwoven fabric, the light traveling in the forward direction is It is possible to realize a light-emitting diode that is focused by the lens unit and has a high luminous intensity in the front direction compared to the side direction and the rear direction while having a wide viewing angle.

また、請求項４に記載の発光ダイオードの如く、請求項１又は２に記載の発光ダイオードにおいて、上記不織布を、透光性のレンズ部で封止した場合には、前方向へ向かう光が、上記レンズ部で集光され、広視野角でありながら側方向や後方向に比べて前方向の光度の高い発光ダイオードが実現できる。
尚、請求項４に記載の発光ダイオードの場合、不織布をレンズ部で封止した結果、不織布の上面のみならず、側周面もレンズ部で覆われることから、不織布の側周面近傍に担持された蛍光体から放射される可視光の一部もレンズ部で集光されることとなり、前方向へ光の光量を多く確保できる。 Moreover, in the light-emitting diode according to claim 1 or 2, like the light-emitting diode according to claim 4, when the non-woven fabric is sealed with a light-transmitting lens portion, light traveling in the forward direction is A light-emitting diode that is focused by the lens unit and has a wide viewing angle and a higher luminous intensity in the front direction than in the side direction and the rear direction can be realized.
In addition, in the case of the light emitting diode according to claim 4, as a result of sealing the non-woven fabric with the lens portion, not only the upper surface of the non-woven fabric but also the side peripheral surface is covered with the lens portion. Part of the visible light emitted from the phosphor is also collected by the lens unit, and a large amount of light can be secured in the forward direction.

請求項５に記載の発光ダイオードの如く、請求項３又は４に記載の発光ダイオードにおいて、上記レンズ部中に、光散乱材を添加した場合には、光を様々な方向へ拡散させて外部へ放射できる。   As in the light-emitting diode according to claim 5, in the light-emitting diode according to claim 3 or 4, when a light scattering material is added to the lens portion, the light is diffused in various directions to the outside. Can radiate.

以下、図面に基づき、本発明に係るＬＥＤ10の実施形態を説明する。
本発明に係るＬＥＤ10は図１及び図２に示すように、樹脂やセラミック等の絶縁材料より成り、口径が下端から上端に向かって拡開する略リング状の枠部材14と、銅等より成る第１のリードフレーム16及び第２のリードフレーム18を有している。上記枠部材14が請求項１に記載の「部材」に該当する。 Hereinafter, embodiments of the LED 10 according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the LED 10 according to the present invention is made of an insulating material such as resin or ceramic, and is made of a substantially ring-shaped frame member 14 whose diameter is expanded from the lower end toward the upper end, and copper or the like. A first lead frame 16 and a second lead frame 18 are provided. The frame member 14 corresponds to a “member” described in claim 1.

上記枠部材14の底面14ａ及び底面開口を、第１のリードフレーム16の先端部16ａで覆うことにより凹部17が形成されており、該凹部17内に露出した第１のリードフレーム16の先端部16ａに、ＬＥＤチップ20をダイボンドすることにより、第１のリードフレーム16とＬＥＤチップ20底面の一方の電極（図示せず）とを電気的に接続している。第１のリードフレーム16の後端部16ｂは、枠部材14を貫通して外方へ向かって水平方向に取り出されている。
而して、凹部17内に露出した第１のリードフレーム16の先端部16ａに、ＬＥＤチップ20を配置したことにより、ＬＥＤチップ20は、該ＬＥＤチップ20より高さが高い枠部材14によって囲繞されることとなる。
上記ＬＥＤチップ20は、窒化ガリウム系半導体結晶等で構成されており、後述する蛍光体を励起させる波長の紫外線や青色可視光等の光を発光するものである。 A concave portion 17 is formed by covering the bottom surface 14 a and the bottom surface opening of the frame member 14 with the distal end portion 16 a of the first lead frame 16, and the distal end portion of the first lead frame 16 exposed in the concave portion 17. The LED chip 20 is die-bonded to 16a to electrically connect the first lead frame 16 and one electrode (not shown) on the bottom surface of the LED chip 20. The rear end portion 16b of the first lead frame 16 passes through the frame member 14 and is taken out in the horizontal direction outward.
Thus, by disposing the LED chip 20 at the distal end portion 16a of the first lead frame 16 exposed in the recess 17, the LED chip 20 is surrounded by the frame member 14 having a height higher than that of the LED chip 20. Will be.
The LED chip 20 is composed of a gallium nitride-based semiconductor crystal or the like, and emits light such as ultraviolet light or blue visible light having a wavelength that excites a phosphor to be described later.

また、第２のリードフレーム18は、上記枠部材14を貫通して凹部17内に露出する先端部18ａと、枠部材14の外方へ向かって水平方向に取り出されている後端部18ｂを有しており、第２のリードフレーム18の先端部18ａと、上記ＬＥＤチップ20上面の他方の電極（図示せず）とをボンディングワイヤ22を介して電気的に接続して成る。   Further, the second lead frame 18 includes a front end portion 18a that penetrates the frame member 14 and is exposed in the concave portion 17, and a rear end portion 18b that is taken out in the horizontal direction toward the outside of the frame member 14. The tip 18a of the second lead frame 18 is electrically connected to the other electrode (not shown) on the upper surface of the LED chip 20 via a bonding wire 22.

上記第１のリードフレーム16の先端部16ａと、第２のリードフレーム18の先端部18ａは、上下方向に所定の間隙を設けて対向配置されることにより、相互に絶縁されている。   The distal end portion 16a of the first lead frame 16 and the distal end portion 18a of the second lead frame 18 are insulated from each other by being arranged to face each other with a predetermined gap in the vertical direction.

上記枠部材14の上面14ｂには、蛍光体26を担持して成る円盤状の不織布28（図３）が配置されている。この結果、ＬＥＤチップ20の上方に、蛍光体26が担持された不織布28が配置され、また、枠部材14の上面開口が上記円盤状の不織布28によって閉塞されることとなる。尚、不織布28は枠部材14の上面14ｂに接着等の手段を介して固着されている。
また、不織布28を、枠部材14の上面14ｂに配置した結果、図１に示すように、上記不織布28の側周面28ａは、枠部材14に当接することなく露出している。
尚、上記不織布28は、その側周面28ａが、枠部材14の外端14ｃから外方へ突出しないように配置されている。これは、不織布28が枠部材14の外端14ｃから外方へ突出していると、ＬＥＤ10の取付作業時等において、枠部材14に固着されていない不織布28の突出部分が剥離したり破損等する虞があるため、これを防止するためである。また、多数のＬＥＤ10を密集配置する場合、不織布28が枠部材14の外端14ｃから外方へ突出していると、ＬＥＤ10の不織布28同士がぶつかってしまい、単位面積当たりのＬＥＤ10の配置個数が少なくなってしまうため、これを防止するためである。 On the upper surface 14b of the frame member 14, a disk-shaped non-woven fabric 28 (FIG. 3) is disposed. As a result, the nonwoven fabric 28 carrying the phosphor 26 is disposed above the LED chip 20, and the upper surface opening of the frame member 14 is blocked by the disk-shaped nonwoven fabric 28. The nonwoven fabric 28 is fixed to the upper surface 14b of the frame member 14 through means such as adhesion.
Further, as a result of disposing the non-woven fabric 28 on the upper surface 14b of the frame member 14, the side peripheral surface 28a of the non-woven fabric 28 is exposed without coming into contact with the frame member 14, as shown in FIG.
The non-woven fabric 28 is arranged so that the side peripheral surface 28a thereof does not protrude outward from the outer end 14c of the frame member 14. This is because, when the nonwoven fabric 28 protrudes outward from the outer end 14c of the frame member 14, the protruding portion of the nonwoven fabric 28 that is not fixed to the frame member 14 is peeled off or damaged when the LED 10 is attached. This is to prevent this because of fear. Further, when a large number of LEDs 10 are densely arranged, if the nonwoven fabric 28 protrudes outward from the outer end 14c of the frame member 14, the nonwoven fabrics 28 of the LEDs 10 collide with each other, and the number of LEDs 10 arranged per unit area is small. This is to prevent this.

上記不織布28は、図３〜図６に示すように、多数の繊維30が絡み合ってシート状と成され、繊維30間に多数の空隙32（図５参照）が形成されており、また、多数の繊維30が立体的に絡み合っているため、単位体積当たりの繊維30の表面積が極めて大きいものである。   3 to 6, the non-woven fabric 28 is formed into a sheet shape in which a large number of fibers 30 are entangled, and a large number of voids 32 (see FIG. 5) are formed between the fibers 30. Since the fibers 30 are three-dimensionally intertwined, the surface area of the fibers 30 per unit volume is extremely large.

上記繊維30は、ナイロン、ポリエステル、アクリル、ポリプロピレン、ポリ塩化ビニル、フッ素樹脂等の樹脂繊維、レーヨン等のセルロース系の化学繊維、ガラス繊維等の短繊維から成り、その直径は１〜５０μｍ、長さは０．５〜２０mm、繊維密度は３０〜１００ｇ／ｃｍ２程度である。光の透過性の観点から、透光性材料で繊維30を構成することが好ましい。
尚、長さが５０〜１００mm程度の長繊維から成る繊維30を用いることも勿論可能である。
上記繊維30の繊維密度や、不織布の厚さ、目付等を適宜調整することにより、不織布を構成する繊維30の総表面積を任意に増減可能である。 The fibers 30 are made of resin fibers such as nylon, polyester, acrylic, polypropylene, polyvinyl chloride, and fluororesin, cellulosic chemical fibers such as rayon, and short fibers such as glass fibers, and the diameter is 1 to 50 μm and long. The thickness is 0.5 to 20 mm, and the fiber density is about 30 to 100 g / cm 2 . From the viewpoint of light transmittance, it is preferable that the fiber 30 is made of a light transmissive material.
Of course, it is also possible to use fibers 30 made of long fibers having a length of about 50 to 100 mm.
By appropriately adjusting the fiber density of the fibers 30, the thickness of the nonwoven fabric, the basis weight, etc., the total surface area of the fibers 30 constituting the nonwoven fabric can be arbitrarily increased or decreased.

上記不織布28に、蛍光体26を分散・添加した透光性の結合剤34を含浸することにより、不織布28を構成する繊維30の表面に、結合剤34を介して蛍光体26を被着・担持させると共に、繊維30間の空隙32に、蛍光体26が添加された結合剤34を充填させている。
図５に示すように、繊維30の表面に被着される蛍光体26の量は、空隙32に充填された結合剤34中の蛍光体26の量よりも多くなっており、さらに、空隙32に充填された結合剤34中の蛍光体26の分布状態は、繊維30に近づくに従って蛍光体24の量が多くなっている。
尚、図５においては、繊維30間の全ての空隙32に結合剤34が充填されている場合を例示したが、これに限定されるものではなく、結合剤34が充填されていない空隙32があっても良い。
上記透光性の結合剤34としては、例えば、シリコン樹脂等の有機材料、ゾルゲルガラス等の無機材料を使用することができる。 By impregnating the non-woven fabric 28 with a translucent binder 34 in which the phosphor 26 is dispersed and added, the phosphor 26 is attached to the surface of the fibers 30 constituting the non-woven fabric 28 via the binder 34. At the same time, the gaps 32 between the fibers 30 are filled with a binder 34 to which a phosphor 26 is added.
As shown in FIG. 5, the amount of the phosphor 26 deposited on the surface of the fiber 30 is larger than the amount of the phosphor 26 in the binder 34 filled in the gap 32, and further, the gap 32. As for the distribution state of the phosphors 26 in the binder 34 filled in, the amount of the phosphors 24 increases as the fiber 30 is approached.
In FIG. 5, the case where all the gaps 32 between the fibers 30 are filled with the binder 34 is illustrated, but the present invention is not limited to this, and the gaps 32 not filled with the binder 34 are present. There may be.
As the translucent binder 34, for example, an organic material such as silicon resin or an inorganic material such as sol-gel glass can be used.

上記不織布28に蛍光体26を担持させる方法の一例として以下の方法を用いることができる。
先ず、所定長さのシート状の不織布28を準備すると共に、粒子状の蛍光体26が分散・添加された液状の結合剤34を液槽（図示せず）内に満たしておく。 The following method can be used as an example of a method for supporting the phosphor 26 on the nonwoven fabric 28.
First, a sheet-like non-woven fabric 28 having a predetermined length is prepared, and a liquid binder 34 in which particulate phosphors 26 are dispersed and added is filled in a liquid tank (not shown).

次に、上記不織布28を、液槽内の結合剤34中に浸漬した状態で真空雰囲気中に導入して脱気処理を行うことにより、繊維30間の空隙32内の空気と結合剤34とを置換させる。
この結果、不織布28を構成する繊維30間の空隙32に、蛍光体26が添加された結合剤34が充填される。
尚、結合剤34に分散・添加された蛍光体26は、液状の結合剤34中で移動するが、固体である繊維30に衝突して移動が妨げられる結果、上記の通り、繊維30表面に被着される蛍光体26の量は、空隙32に充填された結合剤34中の蛍光体26の量よりも多くなり、さらに、空隙32に充填された結合剤34中の蛍光体26の分布状態は、繊維30に近づくに従って蛍光体26の量が多くなる。 Next, the nonwoven fabric 28 is introduced into a vacuum atmosphere in a state immersed in the binder 34 in the liquid tank and subjected to a deaeration treatment, whereby the air in the gap 32 between the fibers 30 and the binder 34 Is replaced.
As a result, the gaps 32 between the fibers 30 constituting the nonwoven fabric 28 are filled with the binder 34 to which the phosphor 26 is added.
The phosphor 26 dispersed and added to the binder 34 moves in the liquid binder 34, but as a result of colliding with the solid fibers 30 and hindering the movement, as described above, The amount of the phosphor 26 to be deposited is larger than the amount of the phosphor 26 in the binder 34 filled in the gap 32, and further, the distribution of the phosphor 26 in the binder 34 filled in the gap 32. In the state, the amount of the phosphor 26 increases as the fiber 30 is approached.

その後、不織布28を所定温度で所定時間加熱して、液状の結合剤34を固化させれば良い。
例えば、結合剤34が熱硬化性樹脂であるシリコン樹脂の場合には、８０〜１５０℃で２〜４時間加熱する。
また、結合剤34が液状のゾルゲルガラス材料の場合には、８０〜１２０℃で０．５〜１時間加熱することにより、ゾルゲルガラス材料を加水分解、重合反応させて固体であるゾルゲルガラスを形成する。
上記ゾルゲルガラスは、金属アルコキシドや金属アセチルアセトネート、金属カルボキシレート等の金属有機化合物を出発物質として、その加水分解、重合反応を利用して合成されるものであり、溶液状態から出発するため、任意の形状のガラスに成形容易である。
上記ゾルゲルガラス材料は、一般式M(OR)n（M:金属元素、R:アルキル基、ｎ：金属の酸化数）の金属有機化合物、水（加水分解のため）、溶媒としてメタノール、DMF（ヂメチルフォルムアミド）、加水分解・重合反応の調整剤としてアンモニアで構成することができ、このゾルゲルガラス材料を加水分解、重合反応させることにより、ゲル化し、硬いガラス状の無機質膜形成が生じてゾルゲルガラスが形成されるのである。 Thereafter, the nonwoven fabric 28 is heated at a predetermined temperature for a predetermined time to solidify the liquid binder 34.
For example, when the binder 34 is a silicon resin that is a thermosetting resin, the binder 34 is heated at 80 to 150 ° C. for 2 to 4 hours.
When the binder 34 is a liquid sol-gel glass material, the sol-gel glass material is hydrolyzed and polymerized to form a solid sol-gel glass by heating at 80 to 120 ° C. for 0.5 to 1 hour. To do.
The sol-gel glass is synthesized using a metal organic compound such as metal alkoxide, metal acetylacetonate, or metal carboxylate as a starting material, and its hydrolysis and polymerization reaction. It is easy to mold into glass of any shape.
The sol-gel glass material includes a metal organic compound of the general formula M (OR) n (M: metal element, R: alkyl group, n: metal oxidation number), water (for hydrolysis), methanol as a solvent, DMF ( Dimethylformamide), which can be composed of ammonia as a regulator of hydrolysis / polymerization reaction. By hydrolyzing and polymerizing this sol-gel glass material, gelation occurs, resulting in the formation of a hard glassy inorganic film. A sol-gel glass is formed.

上記蛍光体26は、ＬＥＤチップ20から発光される紫外線や青色可視光等の光を、所定波長の可視光に変換して放射するものである。
上記蛍光体26としては、例えば以下の組成のものを用いることができる。
紫外線を赤色可視光に変換する赤色発光用の蛍光体26として、Ｍ２Ｏ２Ｓ：Ｅｕ（Ｍは、Ｌａ、Ｇｄ、Ｙの何れか１種）、0.5ＭｇＦ２・3.5ＭｇＯ・ＧｅＯ２：Ｍｎ、2ＭｇＯ・2ＬｉＯ２・Ｓｂ２Ｏ３：Ｍｎ、Ｙ（Ｐ，Ｖ）Ｏ4：Ｅｕ、ＹＶＯ4：Ｅｕ、（Ｓｒ，Ｍｇ）3（ＰＯ4）：Ｓｎ、Ｙ２Ｏ３：Ｅｕ、ＣａＳｉＯ３：Ｐｂ，Ｍｎ等がある。
また、紫外線を緑色可視光に変換する緑色発光用の蛍光体26として、ＢａＭｇ２Ａｌ１６Ｏ２７：Ｅｕ，Ｍｎ、Ｚｎ２ＳｉＯ4：Ｍｎ、（Ｃｅ，Ｔｂ，Ｍｎ）ＭｇＡｌ１１Ｏ１９、ＬａＰＯ4：Ｃｅ，Ｔｂ、（Ｃｅ，Ｔｂ）ＭｇＡｌ１１Ｏ１９、Ｙ２ＳｉＯ５：Ｃｅ，Ｔｂ、ＺｎＳ：Ｃｕ，Ａｌ、ＺｎＳ：Ｃｕ，Ａｕ，Ａｌ、（Ｚｎ，Ｃｄ）Ｓ：Ｃｕ，Ａｌ、ＳｒＡｌ２Ｏ４：Ｅｕ、ＳｒＡｌ２Ｏ４：Ｅｕ，Ｄｙ、Ｓｒ４Ａｌ１４Ｏ２５：Ｅｕ，Ｄｙ、Ｙ３Ａｌ５Ｏ１２：Ｔｂ、Ｙ３（Ａｌ，Ｇａ）５Ｏ１２：Ｔｂ、Ｙ３Ａｌ５Ｏ１２：Ｃｅ、Ｙ３（Ａｌ，Ｇａ）５Ｏ１２：Ｃｅ等がある。
更に、紫外線を青色可視光に変換する青色発光用の蛍光体26として、(ＳｒＣａＢａ)５(ＰＯ４)３Ｃｌ：Ｅｕ、ＢａＭｇ２Ａｌ１６Ｏ２７：Ｅｕ、（Ｓｒ，Ｍｇ）２Ｐ２Ｏ7：Ｅｕ、Ｓｒ２Ｐ２Ｏ7：Ｅｕ、Ｓｒ２Ｐ２Ｏ７：Ｓｎ、Ｓｒ５（ＰＯ4）３Ｃｌ：Ｅｕ、ＢａＭｇ２Ａｌ１６Ｏ２７：Ｅｕ、ＣａＷＯ4、ＣａＷＯ4：Ｐｂ、ＺｎＳ：Ａｇ，Ｃｌ、ＺｎＳ：Ａｇ，Ａｌ、(Ｓｒ，Ｃａ，Ｍｇ)１０(ＰＯ４)６Ｃｌ２：Ｅｕ等がある。
また、青色可視光を発光するＬＥＤチップ20を光源に用いて白色光を得る場合において、ＬＥＤチップ20から放射される青色可視光を緑色可視光に変換する緑色発光用の蛍光体26として、Ｙ３（Ａｌ，Ｇａ）５Ｏ１２：Ｃｅ、ＳｒＧａ２Ｓ４：Ｅｕ、Ｃａ３Ｓｃ２Ｓｉ３Ｏ１２：Ｃｅ、α−ＳｉＡｌＯＮ：Ｅｕ、β−ＳｉＡｌＯＮ：Ｅｕ等がある。
さらに、青色可視光を発光するＬＥＤチップ20を光源に用いた場合において、ＬＥＤチップ20から放射される青色可視光を赤色可視光に変換する赤色発光用の蛍光体26として、（Ｓｒ，Ｃａ）Ｓ：Ｅｕ、（Ｃａ，Ｓｒ）２Ｓｉ５Ｎ８：Ｅｕ、ＣａＳｉＮ２：Ｅｕ、ＣａＡｌＳｉＮ３：Ｅｕ等がある。
上記赤色発光用の蛍光体26、緑色発光用の蛍光体26、青色発光用の蛍光体26を適宜選択・混合して用いることで、種々の色の発色が可能である。
尚、蛍光体26は、有機、無機の蛍光染料や、有機、無機の蛍光顔料を含むものである。 The phosphor 26 emits light such as ultraviolet rays or blue visible light emitted from the LED chip 20 by converting it into visible light having a predetermined wavelength.
As the phosphor 26, for example, one having the following composition can be used.
As a phosphor for red light emission 26 that converts ultraviolet light into red visible light, M 2 O 2 S: Eu (M is one of La, Gd, and Y), 0.5 MgF 2 .3.5MgO.GeO 2 : Mn, 2MgO · 2LiO 2 · Sb 2 O 3: Mn, Y (P, V) O 4: Eu, YVO 4: Eu, (Sr, Mg) 3 (PO 4): Sn, Y 2 O 3: Eu, CaSiO 3 : Pb, Mn, etc.
Further, as phosphors 26 for green light emission that converts ultraviolet light into green visible light, BaMg 2 Al 16 O 27 : Eu, Mn, Zn 2 SiO 4 : Mn, (Ce, Tb, Mn) MgAl 11 O 19 , LaPO 4 : Ce, Tb, (Ce, Tb) MgAl 11 O 19 , Y 2 SiO 5 : Ce, Tb, ZnS: Cu, Al, ZnS: Cu, Au, Al, (Zn, Cd) S: Cu, Al, SrAl 2 O 4 : Eu, SrAl 2 O 4 : Eu, Dy, Sr 4 Al 14 O 25 : Eu, Dy, Y 3 Al 5 O 12 : Tb, Y 3 (Al, Ga) 5 O 12 : Tb, Y 3 Al 5 O 12 : Ce, Y 3 (Al, Ga) 5 O 12 : Ce, and the like.
Furthermore, as a phosphor 26 for blue light emission that converts ultraviolet light into blue visible light, (SrCaBa) 5 (PO 4 ) 3 Cl: Eu, BaMg 2 Al 16 O 27 : Eu, (Sr, Mg) 2 P 2 O 7 : Eu, Sr 2 P 2 O 7 : Eu, Sr 2 P 2 O 7 : Sn, Sr 5 (PO 4 ) 3 Cl: Eu, BaMg 2 Al 16 O 27 : Eu, CaWO 4 , CaWO 4 : Pb, ZnS: Ag, Cl, ZnS: Ag, Al, (Sr, Ca, Mg) 10 (PO 4) 6 Cl 2: there is Eu and the like.
Further, in the case where white light is obtained using the LED chip 20 that emits blue visible light as a light source, a green light emitting phosphor 26 that converts blue visible light emitted from the LED chip 20 into green visible light is used as Y. 3 (Al, Ga) 5 O 12 : Ce, SrGa 2 S 4 : Eu, Ca 3 Sc 2 Si 3 O 12 : Ce, α-SiAlON: Eu, β-SiAlON: Eu, and the like.
Further, when the LED chip 20 that emits blue visible light is used as a light source, the red light emitting phosphor 26 that converts the blue visible light emitted from the LED chip 20 into red visible light is (Sr, Ca). S: Eu, (Ca, Sr) 2 Si 5 N 8 : Eu, CaSiN 2 : Eu, CaAlSiN 3 : Eu, and the like.
Various colors can be generated by appropriately selecting and mixing the phosphor 26 for red light emission, the phosphor 26 for green light emission, and the phosphor 26 for blue light emission.
The phosphor 26 includes organic and inorganic fluorescent dyes and organic and inorganic fluorescent pigments.

上記ＬＥＤ10は、第１のリードフレーム16及び第２のリードフレーム18を介してＬＥＤチップ20に電圧が印加されると、ＬＥＤチップ20から上記蛍光体26を励起する紫外線や青色可視光等の光が発光する。この光が、ＬＥＤチップ20の上方に配置されている不織布28に担持された蛍光体26に照射され、所定波長の可視光に波長変換された後、外部へ放射されるのである。   The LED 10 emits light such as ultraviolet rays and blue visible light that excites the phosphor 26 from the LED chip 20 when a voltage is applied to the LED chip 20 via the first lead frame 16 and the second lead frame 18. Emits light. This light is applied to the phosphor 26 carried on the non-woven fabric 28 disposed above the LED chip 20, converted into visible light having a predetermined wavelength, and then emitted to the outside.

而して、本発明のＬＥＤ10にあっては、ＬＥＤチップ20を囲繞する枠部材14の上面14ｂに蛍光体26を担持して成る不織布28を配置すると共に、該不織布28の側周面28ａを露出させたので、不織布28の側周面28ａ近傍に担持された蛍光体26から放射される可視光は、上記枠部材14に遮られることがなく側方向や後方向を含む様々な方向へ放射されることとなり、その結果、前方向だけでなく側方向や後方向からも視認できる広視野角なＬＥＤ10を実現できる。
尚、上記の通り、不織布28を構成する繊維30間には多数の空隙32が形成されていると共に、繊維30間の空隙32に充填される結合剤34は透光性を有しているので、ＬＥＤチップ20から放射された光の一部は、繊維30表面で反射された後、空隙32及び結合剤34中を通過して様々な方向へ進むため、不織布28の側周面28ａ近傍に担持された蛍光体26にもＬＥＤチップ20の光を照射することができる。 Thus, in the LED 10 of the present invention, the non-woven fabric 28 carrying the phosphor 26 is disposed on the upper surface 14b of the frame member 14 surrounding the LED chip 20, and the side peripheral surface 28a of the non-woven fabric 28 is provided. Since it is exposed, visible light emitted from the phosphor 26 carried near the side peripheral surface 28a of the nonwoven fabric 28 is not blocked by the frame member 14 and is emitted in various directions including the lateral direction and the backward direction. As a result, the LED 10 having a wide viewing angle that can be viewed not only from the front direction but also from the side direction and the rear direction can be realized.
As described above, a large number of voids 32 are formed between the fibers 30 constituting the nonwoven fabric 28, and the binder 34 filled in the voids 32 between the fibers 30 is translucent. A part of the light emitted from the LED chip 20 is reflected on the surface of the fiber 30 and then passes through the gap 32 and the binder 34 in various directions, so that it is in the vicinity of the side peripheral surface 28a of the nonwoven fabric 28. The light of the LED chip 20 can also be irradiated to the carried phosphor 26.

本発明者等は、図７に示す暗室36を用いて、本発明のＬＥＤ10と、比較例としての従来のＬＥＤ60を用いて照度特性についての実験を行った。
すなわち、室温２５℃と成された暗室36の上方に、本発明のＬＥＤ10と従来のＬＥＤ60を、本発明のＬＥＤ10の不織布28，従来のＬＥＤ60の不織布78が下側となるよう下向配置し、また、ＬＥＤ10，60の真下位置の暗室底面上に照度計38を設置して測定点（１）とした。さらに、測定点（１）と１００mm間隔で３個の照度計38を設置して測定点（２），（３），（４）を並列配置した。また、測定点（４）の上方且つ暗室底面から１００mmの高さ位置の暗室側面に照度計38を配置して測定点（５）と成すと共に、測定点（５）と１００mm間隔で３個の照度計38を設置して測定点（６）〜（８）を上方に向かって並列配置した。尚、ＬＥＤ10，60は暗室底面から４００mmの高さに配置されている。
実験は、（１）〜（８）の測定点において照度計38による照度の測定後、ＬＥＤ10，60の真下位置の測定点（１）の照度を１００％としたときの他の測定点（２）〜（８）の照度を百分率で算出した。
結果を表１に示す。

Figure 2012033851
The present inventors conducted experiments on the illuminance characteristics using the dark room 36 shown in FIG. 7 and the LED 10 of the present invention and the conventional LED 60 as a comparative example.
That is, the LED 10 of the present invention and the conventional LED 60 are disposed downward above the dark room 36 formed at room temperature of 25 ° C. so that the nonwoven fabric 28 of the LED 10 of the present invention and the nonwoven fabric 78 of the conventional LED 60 are on the lower side, Moreover, the illuminance meter 38 was installed on the bottom face of the dark room just under LED10,60, and it was set as the measurement point (1). Further, three illuminometers 38 were installed at a measurement point (1) and at an interval of 100 mm, and the measurement points (2), (3) and (4) were arranged in parallel. Also, an illuminometer 38 is arranged above the measurement point (4) and on the side of the dark room at a height of 100 mm from the dark room bottom to form the measurement point (5), and at three intervals of 100 mm from the measurement point (5). The illuminometer 38 was installed, and the measurement points (6) to (8) were arranged in parallel upward. The LEDs 10, 60 are arranged at a height of 400 mm from the bottom of the dark room.
In the experiment, after measuring the illuminance by the illuminometer 38 at the measurement points (1) to (8), the other measurement point (2) when the illuminance at the measurement point (1) immediately below the LEDs 10 and 60 is 100%. ) To (8) were calculated in percentage.
The results are shown in Table 1.
Figure 2012033851

表１の結果から、本発明のＬＥＤ10の場合には、前方向の測定点（１）以外の全ての測定点（２）〜（８）において、従来のＬＥＤ60以上の照度百分率となっており、特に、最も横方向に位置する測定点（８）においては従来のＬＥＤ60が７．０％であるのに対して本発明のＬＥＤ10は１８．８％となっており、広視野角が実現されていることが判る。   From the results of Table 1, in the case of the LED 10 of the present invention, the illuminance percentage is higher than that of the conventional LED 60 at all the measurement points (2) to (8) other than the forward measurement point (1). In particular, at the measurement point (8) located in the most lateral direction, the conventional LED 60 is 7.0%, whereas the LED 10 of the present invention is 18.8%, and a wide viewing angle is realized. I know that.

ところで、ＬＥＤ10は、主として前方向（図１の上方向）の対象物に対して光を照射するものとして用いられることが多いため、広視野角な場合であっても、側方向や後方向に比べて前方向の光度の高いものが求められることも多い。
そこで、図８〜図１１に示す本発明のＬＥＤ10の第１の変形例〜第４の変形例は、広視野角であると共に、側方向や後方向に比べて前方向の光度を高めたＬＥＤ10を実現するものである。 By the way, since the LED 10 is often used mainly for irradiating light on an object in the forward direction (upward in FIG. 1), even in the case of a wide viewing angle, In many cases, a brighter light in the forward direction is required.
Accordingly, the first to fourth modifications of the LED 10 of the present invention shown in FIGS. 8 to 11 have a wide viewing angle and an LED 10 having a higher luminous intensity in the front direction than in the lateral direction and the rear direction. Is realized.

すなわち、図８は、本発明の上記ＬＥＤ10の第１の変形例を示すものであり、該第１の変形例は、ＬＥＤチップ20を囲繞する枠部材14の上面14ｂに蛍光体26を担持して成る不織布28を配置すると共に、該不織布28の側周面28ａを露出させ、さらに、上記不織布28の上面28ｂに透光性樹脂等より成る透光性のレンズ部40を形成した点に特徴を有するものである。   That is, FIG. 8 shows a first modification of the LED 10 according to the present invention. In the first modification, the phosphor 26 is carried on the upper surface 14 b of the frame member 14 surrounding the LED chip 20. The non-woven fabric 28 is disposed, the side peripheral surface 28a of the non-woven fabric 28 is exposed, and a translucent lens portion 40 made of a translucent resin or the like is formed on the upper surface 28b of the non-woven fabric 28. It is what has.

上記レンズ部40は、枠部材14の上面14ｂに配置した不織布28の上方から、不織布28の上面28ｂに、レンズ部40の構成材料である液状樹脂を所定量滴下し、表面張力を利用して薄いレンズ状に液状樹脂を硬化させることにより形成することができる。
この方法でレンズ部40を形成した場合には、液状樹脂が不織布28の繊維30間の空隙32に入り込むため、不織布28とレンズ部40との接合強度を大きくすることができ、レンズ部40が不織布28から剥離することを抑制できる。尚、不織布28の上面28ｂに滴下する液状樹脂の粘土を調整することにより、表面張力で形成されるレンズ部40の厚さを調整することができる。
上記レンズ部40の構成材料となる樹脂としては、例えば、エポキシ樹脂、シリコーン樹脂、アクリル樹脂等の有機系樹脂や無機系樹脂を使用することができる。 The lens unit 40 drops a predetermined amount of a liquid resin, which is a constituent material of the lens unit 40, onto the upper surface 28b of the nonwoven fabric 28 from above the nonwoven fabric 28 disposed on the upper surface 14b of the frame member 14, and uses surface tension. It can be formed by curing a liquid resin into a thin lens shape.
When the lens portion 40 is formed by this method, since the liquid resin enters the gap 32 between the fibers 30 of the nonwoven fabric 28, the bonding strength between the nonwoven fabric 28 and the lens portion 40 can be increased. Peeling from the nonwoven fabric 28 can be suppressed. The thickness of the lens portion 40 formed by the surface tension can be adjusted by adjusting the liquid resin clay dropped on the upper surface 28b of the nonwoven fabric 28.
As a resin that is a constituent material of the lens unit 40, for example, an organic resin or an inorganic resin such as an epoxy resin, a silicone resin, or an acrylic resin can be used.

而して、このＬＥＤ10の第１の変形例にあっては、ＬＥＤチップ20を囲繞する枠部材14の上面14ｂに蛍光体26を担持して成る不織布28を配置すると共に、該不織布28の側周面28ａを露出させたので、不織布28の側周面28ａ近傍に担持された蛍光体26から放射される可視光は、上記枠部材14に遮られることがなく側方向や後方向を含む様々な方向へ放射されることとなり、その結果、前方向だけでなく側方向や後方向からも視認できる広視野角なＬＥＤ10を実現できる。   Thus, in the first modification of the LED 10, the non-woven fabric 28 carrying the phosphor 26 is arranged on the upper surface 14 b of the frame member 14 surrounding the LED chip 20, and the non-woven fabric 28 side is arranged. Since the peripheral surface 28a is exposed, the visible light emitted from the phosphor 26 carried in the vicinity of the side peripheral surface 28a of the nonwoven fabric 28 is not blocked by the frame member 14, and includes various directions including the lateral direction and the backward direction. As a result, the LED 10 having a wide viewing angle that can be viewed not only from the front direction but also from the side direction and the rear direction can be realized.

また、このＬＥＤ10の第１の変形例は、不織布28の上面28ｂに透光性のレンズ部40を形成したので、前方向へ向かう光が、上記レンズ部40で集光され、広視野角でありながら側方向や後方向に比べて前方向の光度の高いＬＥＤ10が実現できる。   Further, in the first modification of the LED 10, the translucent lens portion 40 is formed on the upper surface 28b of the nonwoven fabric 28, so that the light traveling in the forward direction is condensed by the lens portion 40 and has a wide viewing angle. However, the LED 10 having a higher luminous intensity in the front direction than in the side direction and the rear direction can be realized.

図９は、本発明の上記ＬＥＤ10の第２の変形例を示すものであり、該第２の変形例は、上記レンズ部40中に酸化チタン等より成る微粒子状の光散乱材42を添加した点に特徴を有するものであり、その他の構成は上記第１の変形例と同一である。   FIG. 9 shows a second modification of the LED 10 according to the present invention. In the second modification, a particulate light scattering material 42 made of titanium oxide or the like is added to the lens portion 40. The other features are the same as those of the first modified example.

而して、このＬＥＤ10の第２の変形例にあっては、ＬＥＤチップ20を囲繞する枠部材14の上面14ｂに蛍光体26を担持して成る不織布28を配置すると共に、該不織布28の側周面28ａを露出させたので、不織布28の側周面28ａ近傍に担持された蛍光体26から放射される可視光は、上記枠部材14に遮られることがなく側方向や後方向を含む様々な方向へ放射されることとなり、その結果、前方向だけでなく側方向や後方向からも視認できる広視野角なＬＥＤ10を実現できる。   Thus, in the second modification of the LED 10, the non-woven fabric 28 carrying the phosphor 26 is disposed on the upper surface 14 b of the frame member 14 surrounding the LED chip 20, and the non-woven fabric 28 side is arranged. Since the peripheral surface 28a is exposed, the visible light emitted from the phosphor 26 carried in the vicinity of the side peripheral surface 28a of the nonwoven fabric 28 is not blocked by the frame member 14, and includes various directions including the lateral direction and the backward direction. As a result, the LED 10 having a wide viewing angle that can be viewed not only from the front direction but also from the side direction and the rear direction can be realized.

また、このＬＥＤ10の第２の変形例は、不織布28の上面28ｂに透光性のレンズ部40を形成したので、前方向へ向かう光が、上記レンズ部40で集光され、広視野角でありながら側方向や後方向に比べて前方向の光度の高いＬＥＤ10が実現できる。   Further, in the second modification of the LED 10, the translucent lens portion 40 is formed on the upper surface 28b of the nonwoven fabric 28, so that the light traveling forward is condensed by the lens portion 40 and has a wide viewing angle. However, the LED 10 having a higher luminous intensity in the front direction than in the side direction and the rear direction can be realized.

さらに、このＬＥＤ10の第２の変形例は、レンズ部40中に酸化チタン等より成る微粒子状の光散乱材42を添加したので、光を様々な方向へ拡散させて外部へ放射できる。   Further, in the second modification of the LED 10, since the particulate light scattering material 42 made of titanium oxide or the like is added to the lens portion 40, the light can be diffused in various directions and emitted to the outside.

図１０は、本発明の上記ＬＥＤ10の第３の変形例を示すものであり、該第３の変形例は、ＬＥＤチップ20を囲繞する枠部材14の上面14ｂに蛍光体26を担持して成る不織布28を配置すると共に、該不織布28の側周面28ａを露出させ、さらに、上記不織布28を透光性樹脂より成る透光性のレンズ部40で封止した点に特徴を有するものである。このＬＥＤ10の第３の変形例の場合には、不織布28の上面28ｂのみならず、側周面28ａもレンズ部40で覆われている点で、上記第１の変形例とは異なるものである。   FIG. 10 shows a third modification of the LED 10 according to the present invention. The third modification comprises a phosphor 26 supported on the upper surface 14b of the frame member 14 surrounding the LED chip 20. As shown in FIG. The non-woven fabric 28 is arranged, the side peripheral surface 28a of the non-woven fabric 28 is exposed, and the non-woven fabric 28 is further sealed with a translucent lens portion 40 made of a translucent resin. . In the case of the third modified example of the LED 10, not only the upper surface 28b of the nonwoven fabric 28 but also the side peripheral surface 28a is covered with the lens portion 40, which is different from the first modified example. .

而して、このＬＥＤ10の第３の変形例にあっては、ＬＥＤチップ20を囲繞する枠部材14の上面14ｂに蛍光体26を担持して成る不織布28を配置すると共に、該不織布28の側周面28ａを露出させたので、不織布28の側周面28ａ近傍に担持された蛍光体26から放射される可視光は、上記枠部材14に遮られることがなく側方向や後方向を含む様々な方向へ放射されることとなり、その結果、前方向だけでなく側方向や後方向からも視認できる広視野角なＬＥＤ10を実現できる。   Thus, in the third modification of the LED 10, the non-woven fabric 28 carrying the phosphor 26 is disposed on the upper surface 14 b of the frame member 14 surrounding the LED chip 20, and the non-woven fabric 28 side is arranged. Since the peripheral surface 28a is exposed, the visible light emitted from the phosphor 26 carried in the vicinity of the side peripheral surface 28a of the nonwoven fabric 28 is not blocked by the frame member 14, and includes various directions including the lateral direction and the backward direction. As a result, the LED 10 having a wide viewing angle that can be viewed not only from the front direction but also from the side direction and the rear direction can be realized.

また、このＬＥＤ10の第３の変形例は、不織布28をレンズ部40で封止したので、前方向へ向かう光が、上記レンズ部40で集光され、広視野角でありながら側方向や後方向に比べて前方向の光度の高いＬＥＤ10が実現できる。
尚、このＬＥＤ10の第３の変形例は、不織布28をレンズ部40で封止した結果、不織布28の上面28ｂのみならず、側周面28ａもレンズ部40で覆われることから、不織布28の側周面28ａ近傍に担持された蛍光体26から放射される可視光の一部もレンズ部40で集光されることとなり、前方向へ光の光量を多く確保できる。 Further, in the third modification of the LED 10, since the nonwoven fabric 28 is sealed with the lens unit 40, the light traveling in the forward direction is collected by the lens unit 40, and the lateral direction and the rear direction are maintained while having a wide viewing angle. An LED 10 having a higher luminous intensity in the forward direction than in the direction can be realized.
In the third modification of the LED 10, the nonwoven fabric 28 is sealed with the lens portion 40. As a result, not only the upper surface 28b of the nonwoven fabric 28 but also the side peripheral surface 28a is covered with the lens portion 40. Part of the visible light emitted from the phosphor 26 carried in the vicinity of the side peripheral surface 28a is also collected by the lens unit 40, and a large amount of light can be secured in the forward direction.

図１１は、本発明の上記ＬＥＤ10の第４の変形例を示すものであり、該第４の変形例は、上記レンズ部40中に酸化チタン等より成る微粒子状の光散乱材42を添加した点に特徴を有するものであり、その他の構成は上記第３の変形例と同一である。   FIG. 11 shows a fourth modification of the LED 10 according to the present invention. In the fourth modification, a particulate light scattering material 42 made of titanium oxide or the like is added to the lens portion 40. The other features are the same as those of the third modified example.

而して、このＬＥＤ10の第４の変形例にあっては、ＬＥＤチップ20を囲繞する枠部材14の上面14ｂに蛍光体26を担持して成る不織布28を配置すると共に、該不織布28の側周面28ａを露出させたので、不織布28の側周面28ａ近傍に担持された蛍光体26から放射される可視光は、上記枠部材14に遮られることがなく側方向や後方向を含む様々な方向へ放射されることとなり、その結果、前方向だけでなく側方向や後方向からも視認できる広視野角なＬＥＤ10を実現できる。   Thus, in the fourth modification of the LED 10, the non-woven fabric 28 carrying the phosphor 26 is disposed on the upper surface 14 b of the frame member 14 surrounding the LED chip 20, and the non-woven fabric 28 side is arranged. Since the peripheral surface 28a is exposed, the visible light emitted from the phosphor 26 carried in the vicinity of the side peripheral surface 28a of the nonwoven fabric 28 is not blocked by the frame member 14, and includes various directions including the lateral direction and the backward direction. As a result, the LED 10 having a wide viewing angle that can be viewed not only from the front direction but also from the side direction and the rear direction can be realized.

また、このＬＥＤ10の第４の変形例は、不織布28をレンズ部40で封止したので、前方向へ向かう光が、上記レンズ部40で集光され、広視野角でありながら側方向や後方向に比べて前方向の光度の高いＬＥＤ10が実現できる。
尚、このＬＥＤ10の第４の変形例は、不織布28をレンズ部40で封止した結果、不織布28の上面28ｂのみならず、側周面28ａもレンズ部40で覆われることから、不織布28の側周面28ａ近傍に担持された蛍光体26から放射される可視光の一部もレンズ部40で集光されることとなり、前方向へ光の光量を多く確保できる。 Further, in the fourth modification of the LED 10, since the nonwoven fabric 28 is sealed with the lens unit 40, the light traveling in the front direction is collected by the lens unit 40, and the lateral direction and the rear direction are maintained while having a wide viewing angle. An LED 10 having a higher luminous intensity in the forward direction than in the direction can be realized.
In addition, as a result of sealing the nonwoven fabric 28 with the lens portion 40, the fourth modification of the LED 10 is that not only the upper surface 28b of the nonwoven fabric 28 but also the side peripheral surface 28a is covered with the lens portion 40. Part of the visible light emitted from the phosphor 26 carried in the vicinity of the side peripheral surface 28a is also collected by the lens unit 40, and a large amount of light can be secured in the forward direction.

さらに、このＬＥＤ10の第４の変形例は、レンズ部40中に酸化チタン等より成る微粒子状の光散乱材42を添加したので、光を様々な方向へ拡散させて外部へ放射できる。   Further, in the fourth modification of the LED 10, since the light scattering material 42 made of fine particles such as titanium oxide is added to the lens portion 40, the light can be diffused in various directions and emitted to the outside.

上記においては、不織布28を、ＬＥＤチップ20を囲繞する枠部材14の上面14ｂに接触させて配置した場合を例示したが、これに限定されるものではなく、若干の間隙を設けて枠部材14の上方に不織布28を配置しても良い。もっとも、枠部材14の上面14ｂに不織布28を配置した場合の方が、不織布28とＬＥＤチップ20間の距離が小さく、ＬＥＤチップ20の光を不織布28に担持された蛍光体26により多く照射できるので好ましい。   In the above, the case where the nonwoven fabric 28 is disposed in contact with the upper surface 14b of the frame member 14 surrounding the LED chip 20 is illustrated, but the present invention is not limited to this, and the frame member 14 is provided with a slight gap. A non-woven fabric 28 may be disposed on the upper side. However, when the non-woven fabric 28 is arranged on the upper surface 14b of the frame member 14, the distance between the non-woven fabric 28 and the LED chip 20 is smaller, and the phosphor 26 carried on the non-woven fabric 28 can radiate more light from the LED chip 20. Therefore, it is preferable.

また上記においては、不織布28が円盤状の場合を例示したが、これに限定されるものではなく、四角盤等の角盤状の不織布等、他の盤状の不織布28を用いることも勿論できる。   In the above, the case where the nonwoven fabric 28 is disk-shaped is exemplified, but the present invention is not limited to this, and other disk-shaped nonwoven fabric 28 such as a square-shaped nonwoven fabric such as a square disk can be used as a matter of course.

本発明に係る発光ダイオードを模式的に示す概略断面図である。It is a schematic sectional drawing which shows typically the light emitting diode which concerns on this invention. 本発明に係る発光ダイオードにおける不織布を取り外した状態を模式的に示す平面図である。It is a top view which shows typically the state which removed the nonwoven fabric in the light emitting diode which concerns on this invention. 本発明に係る発光ダイオードにおける蛍光体を担持した不織布を模式的に示す斜視図である。It is a perspective view which shows typically the nonwoven fabric which carry | supported the fluorescent substance in the light emitting diode which concerns on this invention. 本発明に係る発光ダイオードにおける蛍光体を担持した不織布を模式的に示す部分拡大図である。It is the elements on larger scale which show typically the nonwoven fabric which carry | supported the fluorescent substance in the light emitting diode which concerns on this invention. 本発明に係る発光ダイオードにおける蛍光体を担持した不織布を模式的に示す要部拡大図である。It is a principal part enlarged view which shows typically the nonwoven fabric which carry | supported the fluorescent substance in the light emitting diode which concerns on this invention. 本発明に係る発光ダイオードにおける蛍光体を担持した不織布を模式的に示す要部拡大断面図である。It is a principal part expanded sectional view which shows typically the nonwoven fabric which carry | supported the fluorescent substance in the light emitting diode which concerns on this invention. 本発明に係る発光ダイオードと比較例の発光ダイオードの照度特性測定に使用した暗室を示す説明図である。It is explanatory drawing which shows the dark room used for the illumination intensity characteristic measurement of the light emitting diode which concerns on this invention, and the light emitting diode of a comparative example. 本発明に係る発光ダイオードの第１の変形例を模式的に示す概略断面図である。It is a schematic sectional drawing which shows typically the 1st modification of the light emitting diode which concerns on this invention. 本発明に係る発光ダイオードの第２の変形例を模式的に示す概略断面図である。It is a schematic sectional drawing which shows typically the 2nd modification of the light emitting diode which concerns on this invention. 本発明に係る発光ダイオードの第３の変形例を模式的に示す概略断面図である。It is a schematic sectional drawing which shows typically the 3rd modification of the light emitting diode which concerns on this invention. 本発明に係る発光ダイオードの第４の変形例を模式的に示す概略断面図である。It is a schematic sectional drawing which shows typically the 4th modification of the light emitting diode which concerns on this invention. 従来の係る発光ダイオードを模式的に示す概略断面図である。It is a schematic sectional drawing which shows typically the conventional light emitting diode. 従来の発光ダイオードにおける蛍光体を担持した不織布を模式的に示す斜視図である。It is a perspective view which shows typically the nonwoven fabric which carry | supported the fluorescent substance in the conventional light emitting diode. 従来の発光ダイオードにおける蛍光体を担持した不織布を模式的に示す部分拡大図である。It is the elements on larger scale which show typically the nonwoven fabric which carry | supported the fluorescent substance in the conventional light emitting diode. 従来の発光ダイオードにおける不織布を構成する繊維を模式的に示す拡大図である。It is an enlarged view which shows typically the fiber which comprises the nonwoven fabric in the conventional light emitting diode. 従来の発光ダイオードにおける不織布を構成する繊維を模式的に示す拡大断面図である。It is an expanded sectional view which shows typically the fiber which comprises the nonwoven fabric in the conventional light emitting diode.

10 ＬＥＤ
14 枠部材
14ａ 枠部材の底面
14ｂ 枠部材の上面
14ｃ 枠部材の外端
16 第１のリードフレーム
16ａ 第１のリードフレームの先端部
16ｂ 第１のリードフレームの後端部
17 凹部
18 第２のリードフレーム
18ａ 第２のリードフレームの先端部
18ｂ 第２のリードフレームの後端部
20 ＬＥＤチップ
22 ボンディングワイヤ
26 蛍光体
28 不織布
28ａ 不織布の側周面
28ｂ 不織布の上面
30 繊維
32 空隙
34 結合剤
36 暗室
38 照度計
40 レンズ部
42 光散乱材
10 LED
14 Frame member
14a Bottom of frame member
14b Upper surface of frame member
14c Outer edge of frame member
16 First lead frame
16a First lead frame tip
16b Rear end of first lead frame
17 Recess
18 Second lead frame
18a Tip of second lead frame
18b Rear end of second lead frame
20 LED chip
22 Bonding wire
26 Phosphor
28 Nonwoven fabric
28a Side surface of nonwoven fabric
28b Top surface of non-woven fabric
30 fibers
32 Air gap
34 Binder
36 Darkroom
38 Illuminometer
40 Lens section
42 Light scattering material

Claims (5)

ＬＥＤチップを凹部内に配置して、ＬＥＤチップを該ＬＥＤチップより高さが高い部材で囲繞すると共に、上記部材の上方に、ＬＥＤチップの発光を所定波長の可視光に変換して放射する蛍光体を担持した不織布を配置して成り、さらに、上記不織布の側周面を露出させたことを特徴とする発光ダイオード。   The LED chip is disposed in the recess, and the LED chip is surrounded by a member having a height higher than that of the LED chip, and the light emitted from the LED chip is converted into visible light having a predetermined wavelength and emitted above the member. A light-emitting diode comprising a non-woven fabric carrying a body and further exposing a side peripheral surface of the non-woven fabric. 上記部材が、ＬＥＤチップを囲繞する枠部材であり、該枠部材の上面に、上記不織布を配置して成り、さらに、上記不織布の側周面を露出させたことを特徴とする請求項１に記載の発光ダイオード。   2. The member according to claim 1, wherein the member is a frame member surrounding the LED chip, the nonwoven fabric is disposed on an upper surface of the frame member, and a side peripheral surface of the nonwoven fabric is exposed. The light emitting diode as described. 上記不織布の上面に、透光性のレンズ部を形成したことを特徴とする請求項１又は２に記載の発光ダイオード。   The light-emitting diode according to claim 1, wherein a translucent lens portion is formed on the upper surface of the nonwoven fabric. 上記不織布を、透光性のレンズ部で封止したことを特徴とする請求項１又は２に記載の発光ダイオード。   The light emitting diode according to claim 1 or 2, wherein the nonwoven fabric is sealed with a translucent lens portion. 上記レンズ部中に、光散乱材を添加したことを特徴とする請求項３又は４に記載の発光ダイオード。


The light emitting diode according to claim 3, wherein a light scattering material is added to the lens portion.


JP2010284708A 2010-07-01 2010-12-21 Light-emitting diode Pending JP2012033851A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003069081A (en) * 2001-08-22 2003-03-07 Okaya Electric Ind Co Ltd Light emitting element and its manufacturing method
JP2003110146A (en) * 2001-07-26 2003-04-11 Matsushita Electric Works Ltd Light-emitting device
JP2009506557A (en) * 2005-08-30 2009-02-12 オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツング Optoelectronic devices
JP2010003788A (en) * 2008-06-19 2010-01-07 Okaya Electric Ind Co Ltd Light-emitting diode and manufacturing method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003110146A (en) * 2001-07-26 2003-04-11 Matsushita Electric Works Ltd Light-emitting device
JP2003069081A (en) * 2001-08-22 2003-03-07 Okaya Electric Ind Co Ltd Light emitting element and its manufacturing method
JP2009506557A (en) * 2005-08-30 2009-02-12 オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツング Optoelectronic devices
JP2010003788A (en) * 2008-06-19 2010-01-07 Okaya Electric Ind Co Ltd Light-emitting diode and manufacturing method thereof

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