【０００１】[0001]
【発明の属する技術分野】この発明は、ＬＥＤ素子を光
源に使用したＬＥＤ電球の放熱構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat radiating structure for an LED bulb using an LED element as a light source.
【０００２】[0002]
【従来の技術】図５は、例えば実登３０３４７４４号公
報（従来例１）に示された従来のＬＥＤ素子を使用した
電球の側面図である。図において４はＬＥＤ素子、１３
は電球体、１４は電子回路を収納した電子回路収納部で
ある。これにより寿命の長い光源を構成することができ
る。2. Description of the Related Art FIG. 5 is a side view of a conventional light bulb using an LED element disclosed in Japanese Utility Model Publication No. 3034744 (conventional example 1). In the figure, 4 is an LED element, 13
Denotes a light bulb body, and 14 denotes an electronic circuit storage unit that stores an electronic circuit. Thereby, a light source having a long life can be configured.
【０００３】また、図６は、例えば特開平０９−２６５
８０７号公報（従来例２）に示されたＬＥＤ信号灯であ
る。図において、２１は反射鏡、２２はＬＥＤ光源であ
り六角筒に配置された回路基板２３に複数のＬＥＤ素子
２４が実装されている。このＬＥＤ素子２４は全て青，
黄，赤のいずれかに発光する。２５は無色透明の前面ガ
ラス、２６は筒状の支持筒、１は口金、２７は点灯回路
基板、２８は投光用開口側に設けられた円板状回路基
板、２９は円板状回路基板２８に設けられた直射用の複
数のＬＥＤ素子である。FIG. 6 shows, for example, Japanese Patent Application Laid-Open No. 09-265.
807 (conventional example 2). In the figure, 21 is a reflecting mirror, 22 is an LED light source, and a plurality of LED elements 24 are mounted on a circuit board 23 arranged in a hexagonal cylinder. The LED elements 24 are all blue,
Emit either yellow or red light. Reference numeral 25 denotes a colorless and transparent front glass, 26 denotes a cylindrical support tube, 1 denotes a base, 27 denotes a lighting circuit board, 28 denotes a disc-shaped circuit board provided on the light emitting opening side, and 29 denotes a disc-shaped circuit board. 28 are a plurality of direct-emitting LED elements provided on the LED device 28.
【０００４】このように構成され、複数のＬＥＤ素子２
４は反射鏡２１に対向させているので、ＬＥＤ素子２４
の光を有効に利用でき、ＬＥＤ光源２２の前方には直射
用ＬＥＤ素子２９を配設したので、前面ガラス２５のほ
ぼ全面の輝度均斉度を高めることができ、視認性がよい
ものである。A plurality of LED elements 2 configured as described above
4 is opposed to the reflecting mirror 21, so that the LED element 24
Since the direct light LED element 29 is disposed in front of the LED light source 22, the brightness uniformity of almost the entire surface of the front glass 25 can be increased, and the visibility is good.
【０００５】[0005]
【発明が解決しようとする課題】ＬＥＤ素子は、一般に
図７に示すように温度上昇に従い光出力が低下し、ま
た、図８に示すように周囲温度が高い（Ｂ）方が周囲温
度が低（Ａ）い方より光出力の低下が大きく、寿命が短
い。しかし、上記の従来例１、２はいずれもＬＥＤ素子
の発熱に対する記載がなく、ＬＥＤ素子の冷却はＬＥＤ
素子からの放射と、電球体１３内または反射鏡２１と前
面ガラス２５で囲まれた内部の空気の対流によるものが
主と考えられる。従って、温度上昇により発光効率が低
下し、寿命が短くなるという問題が考えられる。特に、
従来例２は輝度を均一にするためＬＥＤ素子の数を多く
しているが発熱量も多くなり、発光効率が低下し、寿命
が短くなることが考えられる。In general, the light output of an LED element decreases as the temperature rises as shown in FIG. 7, and the ambient temperature becomes lower when the ambient temperature is higher (B) as shown in FIG. (A) The optical output is greatly reduced and the life is shorter than in the case of (A). However, none of the above conventional examples 1 and 2 has any description of the heat generation of the LED element, and the cooling of the LED element is performed by using the LED.
It is considered that radiation from the element and convection of air inside the bulb 13 or inside the reflector 21 and the front glass 25 are mainly caused. Therefore, there is a problem that the luminous efficiency is reduced due to the temperature rise and the life is shortened. In particular,
In Conventional Example 2, the number of LED elements is increased in order to make the luminance uniform, but the amount of heat generated is also increased, the luminous efficiency is reduced, and the life is shortened.
【０００６】この発明は上記のような問題点を解決する
ためになされたもので、簡単な冷却構造により、ＬＥＤ
素子の発熱を抑制して高い発光効率で長寿命のＬＥＤ電
球を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a simple cooling structure for an LED.
It is an object of the present invention to provide a long-life LED bulb with high luminous efficiency by suppressing heat generation of an element.
【０００７】[0007]
【課題を解決するための手段】この発明に係るＬＥＤ電
球は、一端に口金が設けられ、他端の開口部に向けてラ
ッパ状に拡がるラッパ状金属放熱部と、このラッパ状金
属放熱部の開口部に取付けられた透光性カバーと、前記
ラッパ状金属放熱部と前記透光性カバーにより形成され
た略球体の内部に設けられた金属基板と、この金属基板
の前記透光性カバーに対向する外面に実装されたＬＥＤ
素子と、を備える。An LED bulb according to the present invention is provided with a base at one end and a flared metal heat radiating portion extending in a trumpet shape toward an opening at the other end. A light-transmitting cover attached to the opening, a metal substrate provided inside a substantially spherical body formed by the trumpet-shaped metal heat radiating portion and the light-transmitting cover, and a light-transmitting cover of the metal substrate. LEDs mounted on opposing outer surfaces
And an element.
【０００８】また、金属基板を板状にし、ラッパ状金属
放熱部の開口部に絶縁性を有する高熱伝導部材を介して
固着したものである。Further, the metal substrate is formed in a plate shape and is fixed to the opening of the trumpet-shaped metal heat radiating portion via a high heat conductive member having an insulating property.
【０００９】また、金属基板を一端が口金側に開口し他
端が閉塞された筒状とし、この筒状の金属基板の開口部
をラッパ状金属放熱部の口金側に絶縁性を有する高熱伝
導部材を介して固着したものである。Further, the metal substrate is formed in a cylindrical shape having one end opened to the base and the other end closed, and the opening of the cylindrical metal substrate is provided on the base side of the trumpet-shaped metal heat radiating portion with high thermal conductivity having insulation. It is fixed via a member.
【００１０】また、筒状の金属基板に、ＬＥＤ素子が実
装された部分から口金側の周囲に突設され、前記ＬＥＤ
素子からの放射光を透光カバー方向に反射させるととも
に放熱を行う反射・放熱板を備える。[0010] Further, the LED is provided on a cylindrical metal substrate so as to protrude from a portion on which the LED element is mounted on the base side.
A reflecting / radiating plate is provided for reflecting radiation light from the element in the direction of the light-transmitting cover and radiating heat.
【００１１】[0011]
【発明の実施の形態】実施の形態１．図１はこの発明の
実施の形態１を示すＬＥＤ電球の断面図である。図にお
いて１は給電機能を有する円筒状の口金、２は口金の開
口端から内部側壁に沿うように配置されたリング状の絶
縁体１６の内側壁に治って、一端が取付けられ、他端の
開口部に向けてラッパ状に拡がるラッパ状金属放熱部、
３はラッパ状金属放熱部２の開口部に絶縁性を有する高
熱伝導部材４を介して固着された金属基板、５は金属基
板３の外面に実装されたＬＥＤ素子である。６は金属基
板３を覆うようにしてラッパ状金属放熱部２の開口部に
取付けられた透光性カバー、７はラッパ状金属放熱部２
と透光カバー６とで形成された略球体である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a cross-sectional view of an LED bulb according to Embodiment 1 of the present invention. In the figure, reference numeral 1 denotes a cylindrical base having a power supply function, and 2 denotes an inner wall of a ring-shaped insulator 16 arranged along the inner side wall from the open end of the base, one end of which is attached, and the other end of which is attached. A trumpet-shaped metal heat radiating part that spreads like a trumpet toward the opening,
Reference numeral 3 denotes a metal substrate fixed to the opening of the trumpet-shaped metal heat radiating portion 2 via a high heat conductive member 4 having an insulating property. Reference numeral 5 denotes an LED element mounted on the outer surface of the metal substrate 3. Reference numeral 6 denotes a translucent cover attached to the opening of the trumpet-shaped metal heat radiating portion 2 so as to cover the metal substrate 3, and 7 denotes a trumpet-shaped metal heat radiating portion 2.
And a translucent cover 6.
【００１２】この構成において、まず、口金１から直流
電源が供給されるとＬＥＤ素子４が放射光を放射する。
このときＬＥＤ素子４に発生した熱は略球体７内での対
流による冷却などに加えて、金属基板３から高熱伝導部
材４を介してラッパ状金属放熱部２に流れ、ラッパ状金
属放熱部２から外部の空気に放熱される。In this configuration, first, when DC power is supplied from the base 1, the LED element 4 emits radiated light.
At this time, the heat generated in the LED element 4 flows from the metal substrate 3 to the trumpet-shaped metal heat radiating section 2 through the high heat conduction member 4 in addition to cooling by convection in the substantially spherical body 7. From the outside to the outside air.
【００１３】以上のように、簡単な冷却構造により、Ｌ
ＥＤ素子の発熱を抑制して発光効率を高くすることがで
き、寿命を長くすることができる。As described above, with a simple cooling structure, L
The luminous efficiency can be increased by suppressing the heat generation of the ED element, and the life can be prolonged.
【００１４】実施の形態２．図２は実施の形態２を示す
ＬＥＤ電球の断面図である。図において実施の形態１の
図１と同等の部品には同じ符号を付し説明を省略する。
８は一端が口金１側に開口し他端が閉塞された筒状の金
属基板であり、この金属基板８のＬＥＤ電球の軸方向に
沿い透光カバー６に対向する外側壁と軸方向に直角な外
側面にＬＥＤ素子５を実装し、この筒状金属基板８の内
側に交流を直流に変換する電源回路９を取付け板１０を
介して実装したものである。Embodiment 2 FIG. FIG. 2 is a cross-sectional view of an LED bulb according to the second embodiment. In the figure, the same reference numerals are given to the same components as those in FIG.
Reference numeral 8 denotes a cylindrical metal substrate having one end opened toward the base 1 and the other end closed. The metal substrate 8 extends in the axial direction of the LED bulb and is perpendicular to the outer wall facing the light-transmitting cover 6. An LED element 5 is mounted on the outer surface of the main body, and a power supply circuit 9 for converting alternating current to direct current is mounted via a mounting plate 10 inside the cylindrical metal substrate 8.
【００１５】この構成において、ＬＥＤ素子５に発生し
た熱は略球体７内での対流などにより放熱されるほか、
金属基板８から高熱伝導部材４を介してラッパ状金属放
熱部２に流れ、ラッパ状金属放熱部２から外部の空気に
放熱される。In this configuration, the heat generated in the LED element 5 is radiated by convection in the substantially spherical body 7 and the like.
The metal flows from the metal substrate 8 to the trumpet-shaped metal heat radiating section 2 via the high thermal conductive member 4 and is radiated from the trumpet-shaped metal heat radiating section 2 to the outside air.
【００１６】以上のように、簡単な冷却構造により、多
数のＬＥＤ素子を実装可能としつつ、効率を高くするこ
とができ、寿命を長くすることができる。また、一般商
用電源での点灯を可能にし、一般的な白熱電球と同様な
使い方ができる。As described above, with a simple cooling structure, a large number of LED elements can be mounted, the efficiency can be increased, and the life can be prolonged. In addition, it can be turned on with a general commercial power supply, and can be used in the same manner as a general incandescent lamp.
【００１７】実施の形態３．図３は実施の形態３を示す
ＬＥＤ電球の断面図である。図において実施の形態２の
図２と同等の部品には同じ符号を付し説明を省略する。
１１は一端が口金１側に開口し他端が多角錐または円錐
状に閉塞された筒状の金属基板であり、この金属基板１
１の多角錐または円錐部１１ａにＬＥＤ素子５を実装し
たものである。Embodiment 3 FIG. 3 is a cross-sectional view of an LED bulb according to the third embodiment. In the figure, parts that are the same as those in FIG. 2 of the second embodiment are given the same reference numerals, and descriptions thereof are omitted.
Reference numeral 11 denotes a cylindrical metal substrate having one end open to the base 1 and the other end closed in a polygonal pyramid or conical shape.
The LED element 5 is mounted on one polygonal pyramid or conical portion 11a.
【００１８】この構成により、前記の実施の形態２にお
ける効果に加えて、ＬＥＤ電球の軸に対して斜め前方
（図では斜め下方向）への放射を大きくすることができ
る。With this configuration, in addition to the effects of the second embodiment, it is possible to increase the radiation obliquely forward (in the figure, obliquely downward) with respect to the axis of the LED bulb.
【００１９】以上のように、簡単な冷却構造により、Ｌ
ＥＤ素子の発熱を抑制して発光効率を高くすることがで
き、寿命を長くすることができるとともに、ＬＥＤ電球
の配光を変更することができる。As described above, with a simple cooling structure, L
The luminous efficiency can be increased by suppressing the heat generation of the ED element, the life can be prolonged, and the light distribution of the LED bulb can be changed.
【００２０】実施の形態４．図４は実施の形態４を示す
ＬＥＤ電球の断面図である。図において実施の形態１の
図２と同等の部品には同じ符号を付し説明を省略する。
１２は金属基板８にＬＥＤ素子５が実装された部分から
口金側の金属基板８の周囲に突設され、ＬＥＤ素子５か
らの放射光を透光カバー６方向に反射させるとともに放
熱を行う反射・放熱板である。Embodiment 4 FIG. 4 is a cross-sectional view of an LED bulb according to the fourth embodiment. In the figure, parts that are the same as those in FIG. 2 of Embodiment 1 are given the same reference numerals, and descriptions thereof are omitted.
Reference numeral 12 denotes a reflection / projection member which protrudes from a portion where the LED element 5 is mounted on the metal substrate 8 to the periphery of the metal substrate 8 on the base side, reflects radiation emitted from the LED element 5 in the direction of the light transmitting cover 6 and performs heat dissipation. It is a heat sink.
【００２１】この構成において、ＬＥＤ素子５に発生し
た熱の一部は、放熱金属基板８から反射・放熱板１２を
介して略球体７内での対流により放熱される。さらに、
金属基板８から高熱伝導部材４を介してラッパ状金属放
熱部２に流れ、ラッパ状金属放熱部２から外部の空気に
放熱される。一方、ＬＥＤ素子５から口金１方向に向か
う光や放射された熱は、反射板１２により透光カバー６
方向に反射させ、ＬＥＤ素子５に戻る量を少なくさせ
る。In this configuration, part of the heat generated in the LED element 5 is radiated from the radiating metal substrate 8 through the reflection / radiating plate 12 by convection in the substantially spherical body 7. further,
The metal flows from the metal substrate 8 to the trumpet-shaped metal heat radiating section 2 via the high thermal conductive member 4 and is radiated from the trumpet-shaped metal heat radiating section 2 to the outside air. On the other hand, the light and the heat radiated from the LED element 5 in the direction of the base 1 are transmitted to the light transmitting cover 6 by the reflection plate 12.
The light is reflected in the direction, and the amount returned to the LED element 5 is reduced.
【００２２】以上のように、簡単な冷却構造により、Ｌ
ＥＤ素子の発熱をより一層抑制して、発光効率を高くす
ることができ、寿命を長くすることができるとともに、
反射板１２によりＬＥＤ電球の発光効率をさらに高める
ことができる。As described above, with a simple cooling structure, L
The heat generation of the ED element can be further suppressed, the luminous efficiency can be increased, and the life can be prolonged.
The luminous efficiency of the LED bulb can be further increased by the reflection plate 12.
【００２３】[0023]
【発明の効果】以上のように、この発明によれば、一端
に口金が設けられ、他端の開口部に向けてラッパ状に拡
がるラッパ状金属放熱部と、このラッパ状金属放熱部の
開口部に取付けられた透光性カバーと、前記ラッパ状金
属放熱部と前記透光性カバーにより形成された略球体の
内部に設けられた金属基板と、この金属基板の前記透光
性カバーに対向する外面に実装されたＬＥＤ素子と、を
備えたので、簡単な冷却構造により、ＬＥＤ素子の発熱
を抑制して発光効率を高くすることができ、寿命を長く
することができる。As described above, according to the present invention, a base is provided at one end, and a flared metal heat radiating portion extending in a trumpet shape toward the opening at the other end, and an opening of the flared metal heat radiating portion is provided. A light-transmitting cover attached to the portion, a metal substrate provided inside a substantially spherical body formed by the trumpet-shaped metal heat radiating portion and the light-transmitting cover, and a metal substrate facing the light-transmitting cover. And an LED element mounted on the outer surface of the LED element, so that the simple cooling structure can suppress the heat generation of the LED element, increase the luminous efficiency, and extend the life.
【００２４】また、金属基板を板状にし、ラッパ状金属
放熱部の開口部に絶縁性を有する高熱伝導部材を介して
固着したので、簡単な冷却構造により、ＬＥＤ素子の発
熱を抑制して発光効率を高くすることができ、寿命を長
くすることができるとともに、ＬＥＤ素子の実装を容易
にすることができる。Further, since the metal substrate is formed in a plate shape and is fixed to the opening of the trumpet-shaped metal heat radiating portion via a high heat conductive member having an insulating property, a simple cooling structure suppresses heat generation of the LED element and emits light. Efficiency can be increased, life can be extended, and mounting of the LED element can be facilitated.
【００２５】また、金属基板を一端が口金側に開口し他
端が閉塞された筒状とし、この筒状の金属基板の開口部
をラッパ状金属放熱部の口金側に絶縁性を有する高熱伝
導部材を介して固着したので、簡単な冷却構造により、
多数のＬＥＤ素子を実装可能としつつ、効率を高くする
ことができ、寿命を長くすることができる。Further, the metal substrate is formed in a cylindrical shape having one end opened to the base and the other end closed, and the opening of the cylindrical metal substrate is provided on the base side of the trumpet-shaped metal heat radiating portion with high thermal conductivity having insulation. Since it is fixed via members, a simple cooling structure
Efficiency can be increased while a large number of LED elements can be mounted, and the life can be prolonged.
【００２６】また、筒状の金属基板に、ＬＥＤ素子が実
装された部分から口金側の周囲に突設され、前記ＬＥＤ
素子からの放射光を透光カバー方向に反射させるととも
に放熱を行う反射・放熱板を備えたので、簡単な冷却構
造により、ＬＥＤ素子の発熱をより一層抑制して、発光
効率を高くすることができ、寿命を長くすることができ
る。また、反射板によりＬＥＤ電球の発光効率をさらに
高めることができる。Also, the LED element is provided on a cylindrical metal substrate so as to protrude from the portion where the LED element is mounted on the base side.
With a reflector / radiator plate that reflects emitted light from the element in the direction of the translucent cover and dissipates heat, the simple cooling structure further suppresses heat generation of the LED element and increases luminous efficiency. Can extend the life. Further, the luminous efficiency of the LED bulb can be further increased by the reflector.
【図１】 この発明の実施の形態１を示すＬＥＤ電球の
断面図である。FIG. 1 is a cross-sectional view of an LED bulb according to Embodiment 1 of the present invention.
【図２】 この発明の実施の形態２を示すＬＥＤ電球の
断面図である。FIG. 2 is a cross-sectional view of an LED bulb according to a second embodiment of the present invention.
【図３】 この発明の実施の形態３を示すＬＥＤ電球の
断面図である。FIG. 3 is a sectional view of an LED bulb showing a third embodiment of the present invention.
【図４】 この発明の実施の形態４を示すＬＥＤ電球の
断面図である。FIG. 4 is a cross-sectional view of an LED bulb showing a fourth embodiment of the present invention.
【図５】 従来のＬＥＤ素子を使用した電球の断面図で
ある。FIG. 5 is a cross-sectional view of a light bulb using a conventional LED element.
【図６】 従来のＬＥＤ素子を使用した信号灯の断面図
である。FIG. 6 is a cross-sectional view of a signal light using a conventional LED element.
【図７】 ＬＥＤ素子の温度と光出力の特性図である。FIG. 7 is a characteristic diagram of temperature and light output of an LED element.
【図８】 ＬＥＤ素子の温度による点灯時間に対する光
出力の特性図である。FIG. 8 is a characteristic diagram of a light output with respect to a lighting time depending on a temperature of an LED element.
１ 口金、２ ラッパ状金属放熱部、３、８、１１ 金
属基板、１２ 反射・放熱板、５ ＬＥＤ素子、６ 透
光性カバー、７ 略球体。1 cap, 2 horn-shaped metal radiator, 3, 8, 11 metal substrate, 12 reflector / radiator plate, 5 LED element, 6 translucent cover, 7 substantially spherical body.
フロントページの続き (72)発明者 今井 康雄 神奈川県鎌倉市大船二丁目14番40号 三菱 電機照明株式会社内 (72)発明者 山田 健一 神奈川県鎌倉市大船二丁目14番40号 三菱 電機照明株式会社内 Ｆターム(参考） 5F041 AA33 DA13 DA73 DA75 DA78 DC82 FF11Continued on the front page (72) Inventor Yasuo Imai 2--14-40 Ofuna, Kamakura City, Kanagawa Prefecture Inside Mitsubishi Electric Lighting Co., Ltd. (72) Inventor Kenichi Yamada 2--14-40 Ofuna, Kamakura City, Kanagawa Prefecture Mitsubishi Electric Lighting Stock In-house F term (reference) 5F041 AA33 DA13 DA73 DA75 DA78 DC82 FF11
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000051709AJP2001243809A (en) | 2000-02-28 | 2000-02-28 | Led electric bulb |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000051709AJP2001243809A (en) | 2000-02-28 | 2000-02-28 | Led electric bulb |
| Publication Number | Publication Date |
|---|---|
| JP2001243809Atrue JP2001243809A (en) | 2001-09-07 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000051709APendingJP2001243809A (en) | 2000-02-28 | 2000-02-28 | Led electric bulb |
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