JP2015144069A

JP2015144069A - Led lighting

Info

Publication number: JP2015144069A
Application number: JP2014017085A
Authority: JP
Inventors: 昌利大石; Masatoshi Oishi
Original assignee: Okaya Electric Industry Co Ltd
Current assignee: Okaya Electric Industry Co Ltd
Priority date: 2014-01-31
Filing date: 2014-01-31
Publication date: 2015-08-06

Abstract

PROBLEM TO BE SOLVED: To attain an LED lighting capable of preventing ununiformity of temperature distribution in a substrate in a case where exothermic heat of a drive circuit part is conducted to the substrate mounting an LED.SOLUTION: An annular LED lighting 10 includes an annular LED substrate 16 where a plurality of LEDs 18 is arranged on the surface, a drive circuit part 24 that performs lighting drive to the LEDs 18; and is configured by covering the LED substrate 16 with a translucent front face cover 12. In the LED lighting, is provided an annular heat diffusion member 28 arranged by closely contacting with the rear face of the LED substrate 16 and comprising carbon graphite, and is provided a heat radiation member 20 arranged by closely contacting with the heat diffusion member 28 and the LED substrate 16.

Description

この発明は、複数のＬＥＤ（Light Emitting Diode）を配置したＬＥＤ基板と、上記ＬＥＤを点灯駆動する駆動回路部を備え、上記ＬＥＤ基板を透光性のカバー部材で被覆して成るＬＥＤ灯に関する。 The present invention relates to an LED lamp that includes an LED substrate on which a plurality of LEDs (Light Emitting Diodes) are arranged, and a drive circuit unit that drives the LEDs to light, and the LED substrate is covered with a translucent cover member.

近年、低消費電力・長寿命なＬＥＤを用いた照明が注目を浴び、家庭やオフィス等において、従来の高消費電力・低寿命な蛍光灯に代わるものとして、その普及が期待されている。 In recent years, illumination using LEDs with low power consumption and long life has attracted attention, and is expected to spread as a substitute for conventional fluorescent lamps with high power consumption and low life in homes and offices.

蛍光灯型のＬＥＤ灯の一例として、従来より環型（サークライン型）のＬＥＤ灯がある。斯かる環型のＬＥＤ灯は、表面に複数のＬＥＤを搭載した環状の基板と、上記ＬＥＤを点灯駆動する駆動回路部を有しており、上記ＬＥＤ搭載基板と駆動回路部を透光性のカバー部材で被覆して構成されている（例えば、特開２０１１−１７５８６５号公報参照）。 As an example of a fluorescent lamp type LED lamp, there is a conventional ring type (circular type) LED lamp. Such a ring-shaped LED lamp has a ring-shaped substrate having a plurality of LEDs mounted on the surface thereof, and a drive circuit unit that drives the LEDs to light, and the LED-mounted substrate and the drive circuit unit are translucent. It is configured by covering with a cover member (see, for example, JP 2011-175865 A).

特開２０１１−１７５８６５号公報JP 2011-175865 A

上記構造のＬＥＤ灯にあっては、駆動回路部を構成する発熱性の電子部品（例えばトランスや平滑コンデンサ等）等から高熱が発生し、熱発生箇所近傍のＬＥＤ搭載基板に熱が伝導することにより、環状の基板内において温度分布に不均一化を生じていた。
その結果、基板の高温部に搭載されたＬＥＤの劣化が、低温部に搭載されたＬＥＤよりも早く進行し、照度低下を招来していた。 In the LED lamp having the above structure, high heat is generated from a heat generating electronic component (for example, a transformer or a smoothing capacitor) constituting the drive circuit unit, and the heat is conducted to the LED mounting substrate in the vicinity of the heat generation point. As a result, the temperature distribution in the annular substrate becomes non-uniform.
As a result, the deterioration of the LED mounted on the high temperature portion of the substrate progressed faster than the LED mounted on the low temperature portion, leading to a decrease in illuminance.

本発明は、上記問題に鑑みてなされたものであり、その目的とするところは、駆動回路部の発熱がＬＥＤを搭載した基板に伝導した場合に、基板内における温度分布の不均一化を防止できるＬＥＤ灯を実現することにある。 The present invention has been made in view of the above problems, and its object is to prevent uneven temperature distribution in the substrate when heat generated in the drive circuit unit is conducted to the substrate on which the LED is mounted. It is to realize an LED lamp that can be used.

上記目的を達成するため、本発明の請求項１に記載のＬＥＤ灯は、
表面に複数のＬＥＤを配置して成るＬＥＤ基板と、上記ＬＥＤを点灯駆動する駆動回路部を備えると共に、上記ＬＥＤ基板をカバー部材で被覆して成るＬＥＤ灯であって、上記ＬＥＤ基板の裏面と密接して配置される熱拡散部材を設けたことを特徴とする。 In order to achieve the above object, an LED lamp according to claim 1 of the present invention provides:
An LED board comprising a plurality of LEDs arranged on the surface, and a drive circuit unit for driving and driving the LEDs, and an LED lamp formed by covering the LED board with a cover member, A heat diffusion member disposed in close proximity is provided.

本発明の請求項２に記載のＬＥＤ灯は、請求項１に記載のＬＥＤ灯において、
上記熱拡散部材及びＬＥＤ基板と密接して配置される放熱部材を設けたことを特徴とする。 The LED lamp according to claim 2 of the present invention is the LED lamp according to claim 1,
A heat dissipating member disposed in close contact with the heat diffusing member and the LED substrate is provided.

本発明の請求項３に記載のＬＥＤ灯は、請求項１又は２に記載のＬＥＤ灯において、
上記熱拡散部材が、カーボングラファイト又はヒートパイプであることを特徴とする。 The LED lamp according to claim 3 of the present invention is the LED lamp according to claim 1 or 2,
The heat diffusion member is carbon graphite or a heat pipe.

本発明の請求項４に記載のＬＥＤ灯は、請求項１〜３の何れかに記載のＬＥＤ灯において、
上記駆動回路部は、平常時用駆動回路部と停電時用駆動回路部を備え、
上記平常時用駆動回路部は、交流電源から供給される交流電流を整流する整流部と、ＬＥＤに供給される電流を所定値の電流に制御する定電流制御部と、ＬＥＤに供給される電圧を所定値の電圧に変圧するトランスと、上記トランスから出力される交流電流を整流する整流部と、整流された直流電流を平滑する平滑部を有しており、
上記停電時用駆動回路部は、直流電源の電圧をＬＥＤ駆動用の所定値の電圧に変換して出力する定電圧制御部と、上記定電圧制御部から出力される電流を整流する整流部を有しており、上記定電圧制御部は、上記平常時用駆動回路部のＬＥＤ駆動電圧の電圧値が設定電圧値より小さい場合にＬＥＤ駆動用の電圧を出力するよう構成され、また、上記整流部で整流された直流電流を、平常時用駆動回路部の平滑部に出力するよう構成したことを特徴とする。 The LED lamp according to claim 4 of the present invention is the LED lamp according to any one of claims 1 to 3,
The drive circuit unit includes a normal-time drive circuit unit and a power failure drive circuit unit,
The normal driving circuit unit includes a rectifying unit that rectifies an AC current supplied from an AC power source, a constant current control unit that controls a current supplied to the LED to a predetermined value, and a voltage supplied to the LED. A transformer that transforms the voltage to a voltage of a predetermined value, a rectifying unit that rectifies the alternating current output from the transformer, and a smoothing unit that smoothes the rectified direct current,
The power failure driving circuit unit includes a constant voltage control unit that converts a voltage of a DC power source into a voltage having a predetermined value for LED driving and outputs a voltage, and a rectification unit that rectifies the current output from the constant voltage control unit. The constant voltage control unit is configured to output an LED driving voltage when the voltage value of the LED driving voltage of the normal driving circuit unit is smaller than a set voltage value; The direct current rectified by the unit is output to the smoothing unit of the normal-time drive circuit unit.

本発明の請求項５に記載のＬＥＤ灯は、請求項１〜３の何れかに記載のＬＥＤ灯において、
上記駆動回路部は、平常時用駆動回路部と停電時用駆動回路部を備え、
上記平常時用駆動回路部は、交流電源から供給される交流電流を整流する整流部と、ＬＥＤに供給される電流を所定値の電流に制御する定電流制御部と、ＬＥＤに供給される電圧を所定値の電圧に変圧するトランスと、上記トランスから出力される交流電流を整流する整流部と、整流された直流電流を平滑する平滑部を有しており、
上記停電時用駆動回路部は、ＬＥＤを駆動する所定値の電流を出力する定電流制御部と、上記定電流制御部から出力される電流を整流する整流部を有しており、上記定電流制御部は、上記平常時用駆動回路部のＬＥＤ駆動電流の電流値が設定電流値より小さい場合にＬＥＤ駆動用の電流を出力するよう構成され、また、上記整流部で整流された直流電流を、平常時用駆動回路部の平滑部に出力するよう構成したことを特徴とする。 The LED lamp according to claim 5 of the present invention is the LED lamp according to any one of claims 1 to 3,
The drive circuit unit includes a normal-time drive circuit unit and a power failure drive circuit unit,
The normal driving circuit unit includes a rectifying unit that rectifies an AC current supplied from an AC power source, a constant current control unit that controls a current supplied to the LED to a predetermined value, and a voltage supplied to the LED. A transformer that transforms the voltage to a voltage of a predetermined value, a rectifying unit that rectifies the alternating current output from the transformer, and a smoothing unit that smoothes the rectified direct current,
The power failure driving circuit unit includes a constant current control unit that outputs a current of a predetermined value that drives the LED, and a rectification unit that rectifies the current output from the constant current control unit. The control unit is configured to output an LED driving current when the current value of the LED driving current of the normal driving circuit unit is smaller than a set current value, and the direct current rectified by the rectifying unit is output. In the normal driving circuit unit, the output is made to the smoothing unit.

本発明に係る請求項１に記載のＬＥＤ灯にあっては、ＬＥＤ基板の裏面と密接して配置される熱拡散部材を設けたので、駆動回路部から発生した熱がＬＥＤ基板に伝導した場合、上記熱拡散部材によって熱が速やかに拡散されるので、ＬＥＤ基板内における温度分布の不均一化を防止することができる。 In the LED lamp according to the first aspect of the present invention, since the heat diffusion member disposed in close contact with the back surface of the LED substrate is provided, the heat generated from the drive circuit unit is conducted to the LED substrate. Since the heat is quickly diffused by the heat diffusing member, it is possible to prevent the temperature distribution in the LED substrate from becoming non-uniform.

また、本発明の請求項２に記載のＬＥＤ灯の如く、熱拡散部材及びＬＥＤ基板と密接して配置される放熱部材を設けた場合には、熱拡散部材で拡散させた熱やＬＥＤ自体から発生する熱を放熱部材を介して効率良く放熱することができる。 Further, as in the LED lamp according to claim 2 of the present invention, when the heat diffusing member and the heat radiating member arranged in close contact with the LED substrate are provided, the heat diffused by the heat diffusing member or the LED itself The generated heat can be efficiently radiated through the heat radiating member.

本発明の請求項４に記載のＬＥＤ灯にあっては、駆動回路部を構成する停電時用駆動回路部の定電圧制御部を、平常時用駆動回路部のＬＥＤ駆動電圧の電圧値が設定電圧値より小さい場合に、ＬＥＤ駆動用の電圧を出力するよう構成した。
従って、停電時用駆動回路部の定電圧制御部の設定電圧値を、平常時用駆動回路部のＬＥＤ駆動電圧の電圧値より低い所定値に設定しておくことにより、通常時は平常時用駆動回路部からの駆動電圧でＬＥＤを発光させることができると共に、停電時に平常時用駆動回路部のＬＥＤ駆動電圧が急低下して上記設定電圧値を下回ると、停電時用駆動回路部から駆動電圧が出力されてＬＥＤを発光させることができる。この結果、停電を検出する回路部を別途設けることなく、停電時にもＬＥＤ灯を点灯駆動させることができる。
また、停電時用駆動回路部の整流部で整流した直流電流を、平常時用駆動回路部の平滑部に出力するよう構成し、単一の平滑部を平常時用駆動回路部及び停電時用駆動回路部で共用しているので、部品点数の減少及び小型化を実現することができる。 In the LED lamp according to claim 4 of the present invention, the voltage value of the LED driving voltage of the normal driving circuit unit is set in the constant voltage control unit of the power circuit unit for power failure constituting the driving circuit unit. When the voltage value is smaller than the voltage value, the LED driving voltage is output.
Therefore, by setting the set voltage value of the constant voltage control unit of the power circuit unit for power failure to a predetermined value lower than the voltage value of the LED drive voltage of the normal circuit unit, it is normally used for normal times. The LED can emit light with the drive voltage from the drive circuit unit, and when the LED drive voltage of the normal-use drive circuit unit suddenly drops during the power failure and falls below the set voltage value, it is driven from the drive circuit unit for power failure Voltage can be output to cause the LED to emit light. As a result, the LED lamp can be driven to turn on even during a power failure without separately providing a circuit unit for detecting the power failure.
In addition, the DC current rectified by the rectifier of the power circuit for power failure is output to the smoother of the driver circuit for normal operation, and the single smoother is used for the normal drive circuit and power failure. Since it is shared by the drive circuit unit, the number of parts can be reduced and the size can be reduced.

本発明の請求項５に記載のＬＥＤ灯にあっては、駆動回路部を構成する停電時用駆動回路部の定電流制御部を、平常時用駆動回路部のＬＥＤ駆動電流の電流値が設定電流値より小さい場合に、ＬＥＤ駆動用の電流を出力するよう構成した。
従って、停電時用駆動回路部の定電流制御部の設定電流値を、平常時用駆動回路部のＬＥＤ駆動電流の電流値より低い所定値に設定しておくことにより、通常時は平常時用駆動回路部からの駆動電流でＬＥＤを発光させることができると共に、停電時に平常時用駆動回路部のＬＥＤ駆動電流が急低下して上記設定電流値を下回ると、停電時用駆動回路部から駆動電流が出力されてＬＥＤを発光させることができる。この結果、停電を検出する回路部を別途設けることなく、停電時にもＬＥＤ灯を点灯駆動させることができる。
また、停電時用駆動回路部の整流部で整流した直流電流を、平常時用駆動回路部の平滑部に出力するよう構成し、単一の平滑部を平常時用駆動回路部及び停電時用駆動回路部で共用しているので、部品点数の減少及び小型化を実現することができる。 In the LED lamp according to claim 5 of the present invention, the constant current control unit of the power circuit for power failure constituting the drive circuit unit is set to the current value of the LED drive current of the normal circuit circuit unit. When it is smaller than the current value, the LED driving current is output.
Therefore, by setting the set current value of the constant current control unit of the drive circuit unit for power failure to a predetermined value lower than the current value of the LED drive current of the drive circuit unit for normal operation, The LED can be made to emit light with the drive current from the drive circuit unit, and when the LED drive current of the normal-time drive circuit unit suddenly drops below the set current value at the time of power failure, it is driven from the drive circuit unit for power failure Current can be output to cause the LED to emit light. As a result, the LED lamp can be driven to turn on even during a power failure without separately providing a circuit unit for detecting the power failure.
In addition, the DC current rectified by the rectifier of the power circuit for power failure is output to the smoother of the driver circuit for normal operation, and the single smoother is used for the normal drive circuit and power failure. Since it is shared by the drive circuit unit, the number of parts can be reduced and the size can be reduced.

本発明に係る環型ＬＥＤ灯を示す正面図Front view showing a ring-shaped LED lamp according to the present invention 本発明に係る環型ＬＥＤ灯を示す背面図The rear view which shows the ring-shaped LED lamp which concerns on this invention 本発明に係る環型ＬＥＤ灯を示す正面側斜視図Front perspective view showing a ring-shaped LED lamp according to the present invention 本発明に係る環型ＬＥＤ灯を示す背面側斜視図The back side perspective view showing the ring type LED light concerning the present invention 本発明に係る環型ＬＥＤ灯の前面カバーを取り除いた状態を示す正面図The front view which shows the state which removed the front cover of the cyclic | annular LED lamp which concerns on this invention 本発明に係る環型ＬＥＤ灯の背面カバーを取り除いた状態を示す背面図The rear view which shows the state which removed the back cover of the cyclic | annular LED lamp which concerns on this invention 本発明に係る環型ＬＥＤ灯の前面カバーを取り除いた状態を示す斜視図The perspective view which shows the state which removed the front cover of the cyclic | annular LED lamp which concerns on this invention 本発明に係る環型ＬＥＤ灯を示す分解斜視図The disassembled perspective view which shows the ring-shaped LED lamp which concerns on this invention 本発明に係る環型ＬＥＤ灯の放熱部材を示す背面側斜視図The rear side perspective view which shows the heat radiating member of the ring-shaped LED lamp which concerns on this invention 図５のＡ−Ａ断面図AA sectional view of FIG. 本発明に係る環型ＬＥＤ灯の駆動回路部の構成を示すブロック図The block diagram which shows the structure of the drive circuit part of the ring-shaped LED lamp which concerns on this invention 図１１の駆動回路部の変形例の構成を示すブロック図The block diagram which shows the structure of the modification of the drive circuit part of FIG.

以下、本発明に係るＬＥＤ灯を添付図面に基づき説明する。図１は、本発明に係る環型（サークライン型）のＬＥＤ灯10（以下、環型ＬＥＤ灯10）を示す正面図、図２は同背面図、図３は同正面側斜視図、図４は同背面側斜視図、図５は前面カバー12を取り除いた状態の環型ＬＥＤ灯10を示す正面図、図６は背面カバー14を取り除いた状態の環型ＬＥＤ灯10を示す背面図、図７は前面カバー12を取り除いた状態の環型ＬＥＤ灯10を示す斜視図、図８は本発明に係る環型ＬＥＤ灯10の分解斜視図、図９は環型ＬＥＤ灯10の放熱部材を示す背面側斜視図、図１０は図５のＡ−Ａ断面図である。 Hereinafter, an LED lamp according to the present invention will be described with reference to the accompanying drawings. 1 is a front view showing a ring-shaped (circular-type) LED lamp 10 (hereinafter referred to as a ring-shaped LED lamp 10) according to the present invention, FIG. 2 is a rear view thereof, and FIG. 3 is a front perspective view of the same. 4 is a rear perspective view of the same, FIG. 5 is a front view showing the annular LED lamp 10 with the front cover 12 removed, and FIG. 6 is a rear view showing the annular LED lamp 10 with the rear cover 14 removed. 7 is a perspective view showing the annular LED lamp 10 with the front cover 12 removed, FIG. 8 is an exploded perspective view of the annular LED lamp 10 according to the present invention, and FIG. 9 is a heat dissipation member of the annular LED lamp 10. FIG. 10 is a cross-sectional view taken along line AA in FIG. 5.

本発明に係る環型ＬＥＤ灯10は、透光性を有する樹脂等より成る環状の正面カバー12（図１、図８）と、樹脂等より成る円弧状の背面カバー14（図２、図８）を備えている。
また、図５及び図８に示すように、本発明の環型ＬＥＤ灯10は、上記前面カバー12に被覆される環状のＬＥＤ基板16を有しており、該ＬＥＤ基板16の表面には多数のＬＥＤ18が配置されている。上記ＬＥＤ18は直流電流の供給を受けて白色光を発光するものである。
尚、上記正面カバー12は、透光性のものに限らず、ＬＥＤ18からの光の照射を受けて自発光する非透光性の正面カバーを用いても良い。 An annular LED lamp 10 according to the present invention includes an annular front cover 12 (FIGS. 1 and 8) made of a resin having translucency and an arcuate back cover 14 (FIGS. 2 and 8) made of a resin or the like. ).
As shown in FIGS. 5 and 8, the ring-shaped LED lamp 10 of the present invention has an annular LED substrate 16 that is covered with the front cover 12. LEDs 18 are arranged. The LED 18 emits white light upon receiving a direct current.
The front cover 12 is not limited to the light-transmitting one, and a non-light-transmitting front cover that emits light by receiving light from the LED 18 may be used.

さらに、本発明の環型ＬＥＤ灯10は、アルミニウム等より成る放熱部材20（図６、図８、図９、図１０）を有しており、該放熱部材20は、環状の放熱基板20ａと、該放熱基板20ａの背面の約２／３周に亘って放熱基板20ａ面から立設形成された多数の放熱フィン20ｂを備えている。 Further, the ring-shaped LED lamp 10 of the present invention has a heat radiating member 20 (FIGS. 6, 8, 9, and 10) made of aluminum or the like, and the heat radiating member 20 includes an annular heat radiating substrate 20a. In addition, a large number of radiating fins 20b are provided so as to be erected from the surface of the heat radiating board 20a over about 2/3 of the back surface of the heat radiating board 20a.

図６及び図１０に示すように、放熱フィン20ｂが形成されていない放熱基板20ａの背面には、後述する平滑コンデンサやトランス等の各種電子部品22を有する駆動回路部24が配置された回路基板26が接続されている。
尚、図４において、27は外部電源に接続される端子ピンである。 As shown in FIGS. 6 and 10, a circuit board in which a driving circuit unit 24 having various electronic components 22 such as a smoothing capacitor and a transformer described later is disposed on the back surface of the heat radiating board 20a where the heat radiating fins 20b are not formed. 26 is connected.
In FIG. 4, reference numeral 27 denotes a terminal pin connected to an external power source.

また、図８及び図１０に示すように、放熱部材20を構成する放熱基板20ａの前面には環状に凹溝20ｃが形成されており、該凹溝20ｃ内に環状の熱拡散部材28が配置されている。
上記熱拡散部材28は、その厚さ方向の熱伝導率よりも延在方向の熱伝導率が大きい熱伝導率異方性を有する材料・部材で構成されるものであり、本実施形態においてはカーボングラファイトで熱拡散部材22を構成している。 Further, as shown in FIGS. 8 and 10, an annular concave groove 20c is formed in the front surface of the thermal radiation substrate 20a constituting the thermal radiation member 20, and an annular thermal diffusion member 28 is disposed in the concave groove 20c. Has been.
The thermal diffusion member 28 is composed of a material / member having thermal conductivity anisotropy having a thermal conductivity in the extending direction larger than the thermal conductivity in the thickness direction. The thermal diffusion member 22 is made of carbon graphite.

尚、上記カーボングラファイトに代えて、環状のヒートパイプを熱拡散部材28として好適に用いることができる。ヒートパイプは、密閉された銅や銅合金等より成る管体内部に純水等の作動液を封入したものであり、ヒートパイプの一部が加熱されると、加熱された高温部において作動液が蒸発−低温部へ蒸気が移動−蒸気が低温部で凝縮−凝縮した作動液が加熱部に移動という一連の相変化を通じて熱を速やかに拡散させる仕組みである。 An annular heat pipe can be suitably used as the heat diffusing member 28 instead of the carbon graphite. A heat pipe is a tube made of sealed copper, copper alloy or the like filled with a working fluid such as pure water. When a part of the heat pipe is heated, the working fluid is heated at the heated high temperature part. Is a mechanism in which heat is quickly diffused through a series of phase changes in which the vapor moves to the low temperature portion, the vapor condenses in the low temperature portion, and the condensed working fluid moves to the heating portion.

環状の上記熱拡散部材28は、ＬＥＤ基板16の裏面と密接した状態で、環状のＬＥＤ基板16の全長（全周）に亘って配置されているものである（図８、図１０）。
また、環状の上記熱拡散部材28を、放熱部材20を構成する放熱基板20ａに形成した凹溝20ｃ内に配置した結果、放熱基板20ａは、上記熱拡散部材28と密接した状態で、環状の熱拡散部材28の全長（全周）に亘って配置されていると共に、図１０に示すように、放熱部材20の放熱基板20ａは、ＬＥＤ基板16の裏面とも密接した状態で配置されている。 The annular heat diffusion member 28 is disposed over the entire length (entire circumference) of the annular LED substrate 16 in close contact with the back surface of the LED substrate 16 (FIGS. 8 and 10).
Further, as a result of arranging the annular heat diffusing member 28 in the recessed groove 20c formed in the heat radiating substrate 20a constituting the heat radiating member 20, the heat radiating substrate 20a is in an intimate contact with the heat diffusing member 28 in an annular shape. As shown in FIG. 10, the heat radiating board 20 a of the heat radiating member 20 is arranged in close contact with the back surface of the LED board 16.

上記構成を有する本発明の環型ＬＥＤ灯10にあっては、環状の熱拡散部材28をＬＥＤ基板16の裏面と密接した状態で配置しているので、駆動回路部24から発生した熱がＬＥＤ基板16に伝導した場合、上記熱拡散部材28によって熱が速やかに拡散されるので、ＬＥＤ基板16内における温度分布の不均一化を防止することができる。 In the annular LED lamp 10 of the present invention having the above-described configuration, the annular heat diffusing member 28 is disposed in close contact with the back surface of the LED substrate 16, so that the heat generated from the drive circuit unit 24 is the LED. When conducted to the substrate 16, heat is quickly diffused by the heat diffusing member 28, so that the temperature distribution in the LED substrate 16 can be prevented from becoming non-uniform.

また、本発明の環型ＬＥＤ灯10にあっては、放熱部材20の放熱基板20ａを、上記熱拡散部材28及びＬＥＤ基板16と密接した状態で配置しているので、熱拡散部材28で拡散させた熱やＬＥＤ18自体から発生する熱を放熱部材20の放熱フィン20ｂを介して外部へ効率良く放熱することができる。 Further, in the ring-shaped LED lamp 10 of the present invention, the heat radiating substrate 20a of the heat radiating member 20 is disposed in close contact with the heat diffusing member 28 and the LED substrate 16, so that the heat diffusing member 28 diffuses. The generated heat or the heat generated from the LED 18 itself can be efficiently radiated to the outside through the radiating fins 20b of the radiating member 20.

上記においては、環型（サークライン型）のＬＥＤ灯10を例示して説明したが、本発明はこれに限定されるものではなく、要するに、複数のＬＥＤを配置したＬＥＤ基板と、上記ＬＥＤを点灯駆動する駆動回路部を備え、上記ＬＥＤ基板を透光性のカバー部材で被覆して成るＬＥＤ灯であれば、直型のＬＥＤ灯を含めて適用可能である。 In the above description, the ring type (circular type) LED lamp 10 has been described as an example. However, the present invention is not limited to this, and in short, the LED substrate on which a plurality of LEDs are arranged, and the LED described above. Any LED lamp that includes a drive circuit unit that is driven to light and is formed by covering the LED substrate with a translucent cover member can be applied, including a straight LED lamp.

上記駆動回路部24は、図１１に示すように、平常時用駆動回路部Ａと停電時用駆動回路部Ｂを備えており、平常時用駆動回路部Ａは、入力フィルタ32、整流部34、定電流制御部36、トランス（変圧器）38、整流部40、平滑部42を有している。一方、停電時用駆動回路部Ｂは、入力フィルタ44、定電圧制御部46、整流部48を有している。 As shown in FIG. 11, the driving circuit unit 24 includes a normal driving circuit unit A and a power failure driving circuit unit B. The normal driving circuit unit A includes an input filter 32 and a rectifying unit 34. A constant current control unit 36, a transformer (transformer) 38, a rectification unit 40, and a smoothing unit 42. On the other hand, the power failure driving circuit section B includes an input filter 44, a constant voltage control section 46, and a rectifying section 48.

平常時用駆動回路部Ａにおいては、ＡＣ１００Ｖの商用交流電源50から供給される交流電流を、入力フィルタ32でフィルタ処理してノイズを除去した後、ダイオードブリッジより成る整流部34で整流する。 In the normal driving circuit unit A, the AC current supplied from the AC 100 V commercial AC power supply 50 is filtered by the input filter 32 to remove noise, and then rectified by the rectifying unit 34 formed of a diode bridge.

上記整流部34で整流された直流電流は、制御ＩＣを有する定電流制御部36に入力され、該定電流制御部36は、直列接続された複数個のＬＥＤ18に供給される電流が所定値の電流（例えば300mA）となるよう制御する。
また、上記トランス38は、直列接続された複数個のＬＥＤ18に供給される駆動電圧が所定値の電圧（例えば30V）となるよう交流電源を変圧（降圧）する。 The direct current rectified by the rectifying unit 34 is input to a constant current control unit 36 having a control IC, and the constant current control unit 36 has a predetermined current value supplied to a plurality of LEDs 18 connected in series. It controls so that it may become electric current (for example, 300mA).
The transformer 38 transforms (steps down) the AC power supply so that the drive voltage supplied to the plurality of LEDs 18 connected in series becomes a predetermined voltage (for example, 30 V).

上記トランス38の出力電流は交流となるため、ダイオードブリッジより成る整流部40で直流に整流した後、平滑コンデンサを有する平滑部42で平滑した上でＬＥＤ18に供給するのである。 Since the output current of the transformer 38 is an alternating current, it is rectified to a direct current by a rectifying unit 40 formed of a diode bridge, and then smoothed by a smoothing unit 42 having a smoothing capacitor, and then supplied to the LED 18.

一方、停電時用駆動回路部Ｂにおいては、非常用バッテリーである直流電源52（例えばDC6V）から供給される直流電流を、入力フィルタ44でフィルタ処理してノイズを除去した後、定電圧制御部46に出力する。 On the other hand, in the power failure drive circuit unit B, the DC current supplied from the DC power source 52 (for example, DC6V) which is an emergency battery is filtered by the input filter 44 to remove noise, and then the constant voltage control unit Output to 46.

定電圧制御部46は、直流電源52の電圧を、ＬＥＤ18駆動用の所定値の電圧（例えば30V）にスイッチング方式で変換して出力するものである。図１１に示すように、定電圧制御部46には、平常時用駆動回路部ＡのＬＥＤ駆動電圧の電圧値がフィードバックされるようになっており、定電圧制御部46は、フィードバックされた平常時用駆動回路部ＡのＬＥＤ駆動電圧の電圧値と、予め設定されている電圧値とを比較し、平常時用駆動回路部ＡのＬＥＤ駆動電圧の電圧値が設定電圧値より小さい場合に、ＬＥＤ18駆動用の所定値の電圧を出力する。 The constant voltage control unit 46 converts the voltage of the DC power supply 52 into a voltage (for example, 30 V) of a predetermined value for driving the LED 18 by a switching method and outputs the voltage. As shown in FIG. 11, the voltage value of the LED drive voltage of the normal driving circuit unit A is fed back to the constant voltage control unit 46. The constant voltage control unit 46 is fed back to the normal voltage control unit 46. When the voltage value of the LED driving voltage of the hour driving circuit unit A is compared with a preset voltage value, and the voltage value of the LED driving voltage of the normal driving circuit unit A is smaller than the set voltage value, A voltage of a predetermined value for driving the LED 18 is output.

上記定電圧制御部46の出力電流（交流又は脈流）はダイオードブリッジより成る整流部48で直流に整流される。
上記整流部48で整流された直流電流は、図１１に示すように、平常時用駆動回路部Ａを構成する平滑部42に出力され、該平滑部42で平滑された後、ＬＥＤ18に供給されるのである。尚、平常時用駆動回路部Ａにはダイオードブリッジより成る整流部40があるため、停電時用駆動回路部Ｂの直流電流が、平常時用駆動回路部Ａの整流部40側に回り込むことはなく、同様に、停電時用駆動回路部Ｂにはダイオードブリッジより成る整流部48があるため、平常時用駆動回路部Ａの直流電流が、停電時用駆動回路部Ｂの整流部40側に回り込むこともない。 The output current (AC or pulsating current) of the constant voltage controller 46 is rectified to DC by a rectifier 48 formed of a diode bridge.
As shown in FIG. 11, the direct current rectified by the rectifying unit 48 is output to the smoothing unit 42 constituting the normal driving circuit unit A, smoothed by the smoothing unit 42, and then supplied to the LED 18. It is. Since the normal driving circuit unit A has a rectifying unit 40 formed of a diode bridge, the direct current of the power circuit unit B during a power failure does not flow into the rectifying unit 40 side of the normal driving circuit unit A. Similarly, since the power circuit unit B for power failure has a rectifier unit 48 formed of a diode bridge, the DC current of the normal circuit unit A for normal operation is transferred to the rectifier unit 40 side of the power circuit unit B for power failure. There is no wraparound.

本発明に係る環型ＬＥＤ灯10にあっては、駆動回路部24を構成する停電時用駆動回路部Ｂの定電圧制御部46を、平常時用駆動回路部ＡのＬＥＤ駆動電圧の電圧値が設定電圧値より小さい場合に、ＬＥＤ18駆動用の電圧を出力するよう構成した。
従って、停電時用駆動回路部Ｂの定電圧制御部46の設定電圧値を、平常時用駆動回路部ＡのＬＥＤ駆動電圧の電圧値より低い所定値に設定しておくことにより、通常時は平常時用駆動回路部Ａからの駆動電圧でＬＥＤ18を発光させることができると共に、停電時に平常時用駆動回路部ＡのＬＥＤ駆動電圧が急低下して上記設定電圧値を下回ると、停電時用駆動回路部Ｂから駆動電圧が出力されてＬＥＤ18を発光させることができる。この結果、停電を検出する回路部を別途設けることなく、停電時にも環型ＬＥＤ灯10を点灯駆動させることができる。 In the ring-shaped LED lamp 10 according to the present invention, the constant voltage control unit 46 of the power circuit unit B for power failure constituting the drive circuit unit 24 is replaced with the voltage value of the LED drive voltage of the normal circuit unit A. Is set to output a voltage for driving the LED 18 when the voltage is smaller than the set voltage value.
Therefore, by setting the set voltage value of the constant voltage control unit 46 of the drive circuit unit B for power failure to a predetermined value lower than the voltage value of the LED drive voltage of the drive circuit unit A for normal times, The LED 18 can be made to emit light with the driving voltage from the normal driving circuit unit A, and if the LED driving voltage of the normal driving circuit unit A suddenly drops during the power failure and falls below the set voltage value, A drive voltage is output from the drive circuit unit B, and the LED 18 can emit light. As a result, the ring-shaped LED lamp 10 can be driven to turn on even during a power failure without separately providing a circuit unit for detecting the power failure.

また、本発明に係る環型ＬＥＤ灯10の駆動回路部24は、停電時用駆動回路部Ｂの整流部48で整流した直流電流を、平常時用駆動回路部Ａの平滑部42に出力するよう構成し、単一の平滑部42を平常時用駆動回路部Ａ及び停電時用駆動回路部Ｂで共用しているので、部品点数の減少及び小型化を実現することができる。 Further, the drive circuit unit 24 of the ring LED lamp 10 according to the present invention outputs the direct current rectified by the rectifying unit 48 of the power circuit unit B for power failure to the smoothing unit 42 of the normal driving circuit unit A. Since the single smoothing unit 42 is shared by the normal driving circuit unit A and the power failure driving circuit unit B, the number of parts and the size can be reduced.

尚、停電時用駆動回路部Ｂにおける上記定電圧制御部46に代えて、図１２に示すように、定電流制御部54を用いても良い。図１２において、56は電流検出用の抵抗である。
上記定電流制御部54は、直列接続された複数個のＬＥＤ18を駆動する所定値の電流を出力するものである。
図１２に示すように、定電流制御部54には、平常時用駆動回路部ＡのＬＥＤ駆動電流の電流値がフィードバックされるようになっており、定電流制御部54は、フィードバックされた平常時用駆動回路部ＡのＬＥＤ駆動電流の電流値と、予め設定されている電流値とを比較し、平常時用駆動回路部ＡのＬＥＤ駆動電流の電流値が設定電流値より小さい場合に、ＬＥＤ18駆動用の所定値の電流を出力するのである。 Instead of the constant voltage control unit 46 in the power failure drive circuit unit B, a constant current control unit 54 may be used as shown in FIG. In FIG. 12, reference numeral 56 denotes a current detection resistor.
The constant current control unit 54 outputs a current having a predetermined value for driving the plurality of LEDs 18 connected in series.
As shown in FIG. 12, the constant current control unit 54 is fed back with the current value of the LED drive current of the normal driving circuit unit A, and the constant current control unit 54 is fed back to the normal current control unit 54. When the current value of the LED driving current of the hour driving circuit unit A is compared with a preset current value, and the current value of the LED driving current of the normal driving circuit unit A is smaller than the set current value, A predetermined value of current for driving the LED 18 is output.

図１２に示す駆動回路部24を有する環型ＬＥＤ灯10にあっては、駆動回路部24を構成する停電時用駆動回路部Ｂの定電流制御部54を、平常時用駆動回路部ＡのＬＥＤ駆動電流の電流値が設定電流値より小さい場合に、ＬＥＤ18駆動用の電流を出力するよう構成した。
従って、停電時用駆動回路部Ｂの定電流制御部54の設定電流値を、平常時用駆動回路部ＡのＬＥＤ駆動電流の電流値より低い所定値に設定しておくことにより、通常時は平常時用駆動回路部Ａからの駆動電流でＬＥＤ18を発光させることができると共に、停電時に平常時用駆動回路部ＡのＬＥＤ駆動電流が急低下して上記設定電流値を下回ると、停電時用駆動回路部Ｂから駆動電流が出力されてＬＥＤ18を発光させることができる。この結果、停電を検出する回路部を別途設けることなく、停電時にも環型ＬＥＤ灯10を点灯駆動させることができる。 In the ring-shaped LED lamp 10 having the drive circuit unit 24 shown in FIG. 12, the constant current control unit 54 of the power failure drive circuit unit B constituting the drive circuit unit 24 is connected to the normal-time drive circuit unit A. When the current value of the LED drive current is smaller than the set current value, a current for driving the LED 18 is output.
Therefore, by setting the set current value of the constant current control unit 54 of the drive circuit unit B for power failure to a predetermined value lower than the current value of the LED drive current of the drive circuit unit A for normal times, The LED 18 can be made to emit light with the drive current from the normal driving circuit section A, and when the LED driving current of the normal driving circuit section A drops suddenly and falls below the set current value during a power failure, A drive current is output from the drive circuit unit B, and the LED 18 can emit light. As a result, the ring-shaped LED lamp 10 can be driven to turn on even during a power failure without separately providing a circuit unit for detecting the power failure.

また、図１２に示す駆動回路部24も、図１１の駆動回路部24と同じく、停電時用駆動回路部Ｂの整流部48で整流した直流電流を、平常時用駆動回路部Ａの平滑部42に出力するよう構成し、単一の平滑部42を平常時用駆動回路部Ａ及び停電時用駆動回路部Ｂで共用しているので、部品点数の減少及び小型化を実現することができる。 Also, the drive circuit unit 24 shown in FIG. 12 is the same as the drive circuit unit 24 in FIG. 11, and the smoothing unit of the normal-time drive circuit unit A uses the direct current rectified by the rectification unit 48 of the power failure drive circuit unit B. Since the single smoothing unit 42 is shared by the normal driving circuit unit A and the power failure driving circuit unit B, the number of parts can be reduced and the size can be reduced. .

10 環型ＬＥＤ灯
12 前面カバー
14 背面カバー
16 ＬＥＤ基板
18 ＬＥＤ
20 放熱部材
20ａ放熱基板
20ｂ放熱フィン
20ｃ凹溝
22 電子部品
24 駆動回路部
26 回路基板
27 端子ピン
28 熱拡散部材
Ａ平常時用駆動回路部
32 入力フィルタ
34 整流部
36 定電流制御部
38 トランス
40 整流部
42 平滑部
Ｂ停電時用駆動回路部
44 入力フィルタ
46 定電圧制御部
48 整流部
50 交流電源
52 直流電源
54 定電流制御部
56 抵抗
10 Ring LED light
12 Front cover
14 Back cover
16 LED board
18 LED
20 Heat dissipation member
20a Heat dissipation board
20b Heat radiation fin
20c groove
22 Electronic components
24 Drive circuit
26 Circuit board
27 Terminal pin
28 Thermal diffusion member A Normal-time drive circuit
32 input filters
34 Rectifier
36 Constant current controller
38 transformer
40 Rectifier
42 Smoothing part B Power circuit for power failure
44 Input filter
46 Constant voltage controller
48 Rectifier
50 AC power supply
52 DC power supply
54 Constant current controller
56 Resistance

Claims

An LED board comprising a plurality of LEDs arranged on the surface, and a drive circuit unit for driving and driving the LEDs, and an LED lamp formed by covering the LED board with a cover member, An LED lamp comprising a heat diffusion member disposed in close proximity.

The LED lamp according to claim 1, further comprising a heat dissipating member disposed in close contact with the heat diffusing member and the LED substrate.

The LED lamp according to claim 1 or 2, wherein the heat diffusion member is carbon graphite or a heat pipe.

The drive circuit unit includes a normal-time drive circuit unit and a power failure drive circuit unit,
The normal driving circuit unit includes a rectifying unit that rectifies an AC current supplied from an AC power source, a constant current control unit that controls a current supplied to the LED to a predetermined value, and a voltage supplied to the LED. A transformer that transforms the voltage to a voltage of a predetermined value, a rectifying unit that rectifies the alternating current output from the transformer, and a smoothing unit that smoothes the rectified direct current,
The power failure driving circuit unit includes a constant voltage control unit that converts a voltage of a DC power source into a voltage having a predetermined value for LED driving and outputs a voltage, and a rectification unit that rectifies the current output from the constant voltage control unit. The constant voltage control unit is configured to output an LED driving voltage when the voltage value of the LED driving voltage of the normal driving circuit unit is smaller than a set voltage value; The LED lamp according to claim 1, wherein the direct current rectified by the unit is output to the smoothing unit of the normal driving circuit unit.

The drive circuit unit includes a normal-time drive circuit unit and a power failure drive circuit unit,
The normal driving circuit unit includes a rectifying unit that rectifies an AC current supplied from an AC power source, a constant current control unit that controls a current supplied to the LED to a predetermined value, and a voltage supplied to the LED. A transformer that transforms the voltage to a voltage of a predetermined value, a rectifying unit that rectifies the alternating current output from the transformer, and a smoothing unit that smoothes the rectified direct current,
The power failure driving circuit unit includes a constant current control unit that outputs a current of a predetermined value that drives the LED, and a rectification unit that rectifies the current output from the constant current control unit. The control unit is configured to output an LED driving current when the current value of the LED driving current of the normal driving circuit unit is smaller than a set current value, and the direct current rectified by the rectifying unit is output. The LED lamp according to any one of claims 1 to 3, wherein the LED lamp is configured to output to a smoothing section of a normal driving circuit section.