JP2000030877A - Lighting system - Google Patents
Lighting systemInfo
- Publication number
- JP2000030877A JP2000030877A JP10200951A JP20095198A JP2000030877A JP 2000030877 A JP2000030877 A JP 2000030877A JP 10200951 A JP10200951 A JP 10200951A JP 20095198 A JP20095198 A JP 20095198A JP 2000030877 A JP2000030877 A JP 2000030877A
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- Prior art keywords
- lighting device
- full
- circuit
- led
- output terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は発光ダイオードを光
源とする照明装置に関するものであり、特に、その段調
光回路に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device using a light emitting diode as a light source, and more particularly to a step dimming circuit.
【０００２】[0002]
【従来の技術】従来、発光ダイオードを光源とする照明
装置において、光出力を可変とするために幾つかの回路
が提案されている。図５の従来例は、複数のＬＥＤを直
列接続して成る複数列のＬＥＤアレイ１，…，ｍ（ｍは
２以上の整数）と、各ＬＥＤアレイ１，…，ｍの一端に
一方の電極を接続された電源Ｅと、電源Ｅの他方の電極
に各一端を接続された限流用の抵抗Ｒ１，Ｒ２と、これ
らの抵抗Ｒ１，Ｒ２の各他端とＬＥＤアレイ１，…，ｍ
の各他端を任意に切り替え接続するスイッチ手段ＳＷと
から成り、抵抗値の異なる２つの抵抗Ｒ１，Ｒ２のいず
れかを限流用の抵抗として選択することにより、各ＬＥ
Ｄアレイ１，…，ｍは各々２種類の電流値を選択するこ
とができ、ｍ＝２の照明装置では、４段階の調光が可能
となる。2. Description of the Related Art Conventionally, in an illumination device using a light emitting diode as a light source, several circuits have been proposed to make the light output variable. 5, a plurality of rows of LED arrays 1,..., M (m is an integer of 2 or more) formed by connecting a plurality of LEDs in series, and one electrode at one end of each of the LED arrays 1,. , A current limiting resistor R1, R2 having one end connected to the other electrode of the power source E, the other end of each of the resistors R1, R2 and the LED array 1,.
And switch means SW for arbitrarily switching and connecting the other ends of the respective LEs. By selecting one of the two resistors R1 and R2 having different resistance values as a current-limiting resistor,
Each of the D arrays 1,..., M can select two types of current values, and a lighting device with m = 2 enables four-step dimming.
【０００３】図６の従来例は、トランジスタを用いた定
電流回路によりＬＥＤに流れる電流を切り替えるもので
あり、複数のＬＥＤを直列接続して成る複数列のＬＥＤ
アレイ１，…，ｍ（ｍは２以上の整数）と、各ＬＥＤア
レイ１，…，ｍの一端に一方の電極を接続された電源Ｅ
と、電源Ｅの他方の電極に各一端を接続された限流用の
抵抗Ｒ１，…，Ｒｍと、これらの抵抗Ｒ１，…，Ｒｍの
各他端にエミッタを接続され、ＬＥＤアレイ１，…，ｍ
の各他端にコレクタを接続されたトランジスタＱ１，
…，Ｑｍと、各トランジスタＱ１，…，Ｑｍにベース電
位を与える直流電源Ｅ１，Ｅ２と、各トランジスタＱ
１，…，Ｑｍのベースと直流電源Ｅ１，Ｅ２の接続を個
別に選択するスイッチ手段ＳＷとから成り、電圧値の異
なる２つの直流電源Ｅ１，Ｅ２のいずれかを各トランジ
スタＱ１，…，Ｑｍのベースに接続することにより、各
ＬＥＤアレイ１，…，ｍは各々２種類の電流値を選択す
ることができ、ｍ＝２の照明装置では、４段階の調光が
可能となる。FIG. 6 shows a conventional example in which a current flowing through an LED is switched by a constant current circuit using a transistor, and a plurality of rows of LEDs formed by connecting a plurality of LEDs in series.
, M (m is an integer of 2 or more) and a power source E having one end connected to one end of each of the LED arrays 1,.
, Rm, one end of each of which is connected to the other electrode of the power source E, and an emitter connected to the other end of each of the resistors R1,. m
Transistors Q1, each having a collector connected to the other end of the transistor Q1,
, Qm, DC power supplies E1, E2 for applying a base potential to the transistors Q1,.
, Qm and switch means SW for individually selecting the connection between the DC power supplies E1, E2. One of the two DC power supplies E1, E2 having different voltage values is connected to each of the transistors Q1,. By connecting to the base, each of the LED arrays 1,..., M can select two kinds of current values, and in the lighting device with m = 2, four-stage dimming becomes possible.
【０００４】図７の従来例は、図６と同様の回路構成の
定電流回路であるが、トランジスタＱ１，…，Ｑｍのべ
ースに接続される直流電源Ｅ１，Ｅ２に代えて、矩形波
状のパルス波形を出力するパルス電源Ｐ１，Ｐ２を用い
たものであり、パルス状の電圧によりトランジスタＱ
１，…，Ｑｍに流れる電流を断続させ、パルス幅制御
（ＰＷＭ制御）によりＬＥＤに流れる平均電流を切り替
えている。すなわち、パルス幅（デューティ）の異なる
２つの矩形波状のパルス波形を出力するパルス電源Ｐ
１，Ｐ２のいずれかを各トランジスタＱ１，…，Ｑｍの
ベースに接続することにより、各ＬＥＤアレイ１，…，
ｍは各々２種類の平均電流値を選択することができ、ｍ
＝２の照明装置では、４段階の調光が可能となる。The conventional example of FIG. 7 is a constant current circuit having a circuit configuration similar to that of FIG. 6, except that DC power supplies E1, E2 connected to the bases of transistors Q1,. Using pulse power supplies P1 and P2 that output a pulse waveform of
, Qm are interrupted, and the average current flowing to the LED is switched by pulse width control (PWM control). That is, a pulse power supply P that outputs two rectangular pulse waveforms having different pulse widths (duties).
, P2 is connected to the base of each of the transistors Q1,.
m can select two kinds of average current values, and m
In the lighting device of = 2, four-step light control is possible.
【０００５】[0005]
【発明が解決しようとする課題】これらの電流制御方式
では、同一電源Ｅを用いて段調光を行っており、図５の
抵抗切り替え方式では、抵抗Ｒ１，Ｒ２の消費電力を設
定する際、抵抗Ｒ１，Ｒ２に流れる最大電流を想定しな
ければならない。また、流れる電流は、接続されるＬＥ
Ｄアレイの最大数とＬＥＤに流す最大電流を考慮せねば
ならない。したがって、消費電力の大きい抵抗Ｒ１，Ｒ
２を採用しなければならず、コスト、サイズとも大きい
抵抗となる。また、図６、図７の方式でも、同様にＬＥ
Ｄアレイの最大接続数を考慮した設計が必要となるた
め、制御部のコスト、サイズとも大きくなる。In these current control methods, step dimming is performed using the same power supply E. In the resistance switching method shown in FIG. 5, when setting the power consumption of the resistors R1 and R2, The maximum current flowing through the resistors R1 and R2 must be assumed. Also, the flowing current depends on the connected LE.
The maximum number of D-arrays and the maximum current flowing through the LEDs must be considered. Therefore, the resistors R1, R
2 must be adopted, which results in a large resistance in both cost and size. Also, in the systems of FIG. 6 and FIG.
Since the design considering the maximum number of connections of the D array is required, the cost and size of the control unit are both increased.
【０００６】本発明は上述のような点に鑑みてなされた
ものであり、その目的とするところは、発光ダイオード
を光源とする照明装置において、安価で小型化も容易な
構成で光出力を段調光可能とすることにある。The present invention has been made in view of the above points, and an object of the present invention is to provide a lighting apparatus using a light emitting diode as a light source, and to reduce the light output in a low-cost and easily miniaturized configuration. The purpose is to enable dimming.
【０００７】[0007]
【課題を解決するための手段】本発明の照明装置によれ
ば、上記の課題を解決するために、図１に示すように、
１個あるいは複数個の発光ダイオードと限流要素Ｚ１，
Ｚ２，…，Ｚｍとを直列に接続して成るＬＥＤアレイ
１，２，…，ｍを複数列備え、交流電源ＡＣを全波整流
する全波整流回路ＤＢの一方の直流出力端子に各ＬＥＤ
アレイ１，２，…，ｍの各一端を共通接続し、各ＬＥＤ
アレイ１，２，…，ｍの各他端をそれぞれ前記全波整流
回路ＤＢの他方の直流出力端子又は前記交流電源ＡＣの
一端のいずれかに選択的に切り替え接続するスイッチ手
段ＳＷを設けたことを特徴とするものである。According to the lighting device of the present invention, in order to solve the above-mentioned problems, as shown in FIG.
One or more light emitting diodes and current limiting elements Z1,
, M are connected in series, and each LED is connected to one DC output terminal of a full-wave rectifier circuit DB for full-wave rectification of the AC power supply AC.
One end of each of the arrays 1, 2,.
.., M are provided with switch means SW for selectively switching and connecting the other ends of the arrays 1, 2,..., M to one of the other DC output terminal of the full-wave rectifier circuit DB and one end of the AC power supply AC. It is characterized by the following.
【０００８】[0008]
【発明の実施の形態】（実施例１）図１に本発明の実施
例１の回路図を示す。本実施例の回路は、交流電源ＡＣ
と、この交流電源ＡＣに接続された全波整流回路ＤＢ
と、複数のＬＥＤを直列接続して成る複数列のＬＥＤア
レイ１，…，ｍ（ｍは２以上の整数）と、各ＬＥＤアレ
イ１，…，ｍのカソード側に各一端を接続され、全波整
流回路ＤＢの負出力端子に各他端を共通接続された抵抗
等の限流素子Ｚ１，…，Ｚｍと、各ＬＥＤアレイ１，
…，ｍのアノード側を全波整流回路ＤＢの正出力端子又
は交流電源ＡＣの一端に選択的に切り替え接続するスイ
ッチ手段ＳＷとから成り、全波通電又は半波通電のいず
れかを選択することにより、各ＬＥＤアレイ１，…，ｍ
は各々２種類の電流値を選択することができ、ｍ＝２の
照明装置では、４段階の調光が可能となる。(Embodiment 1) FIG. 1 shows a circuit diagram of Embodiment 1 of the present invention. The circuit of this embodiment is an AC power supply
And a full-wave rectifier circuit DB connected to the AC power supply AC
, M (m is an integer of 2 or more) formed by connecting a plurality of LEDs in series, and one end is connected to the cathode side of each LED array 1,. Current limiting elements Z1,..., Zm such as resistors, the other ends of which are commonly connected to the negative output terminal of the wave rectifier circuit DB;
.., M are selectively connected to the positive output terminal of the full-wave rectifier circuit DB or one end of the AC power supply AC and connected to the switch means SW, and either full-wave conduction or half-wave conduction is selected. , Each LED array 1,..., M
Can select two kinds of current values, respectively, and in the lighting device of m = 2, four-step light control is possible.
【０００９】例えば、限流素子Ｚ１に直列に複数のＬＥ
Ｄを接続したＬＥＤアレイ１のアノード側端子Ａ１を交
流電源ＡＣの一端Ｓ１に接続すると、図２（ａ）に示す
ように、ＬＥＤの順方向降下電圧によって決まる所定電
圧Ｖｔを越えると限流素子Ｚ１により制限された電流Ｉ
ｚ１がＬＥＤに流れ、ＬＥＤが点灯発光する。このと
き、ＬＥＤの整流作用により、半波整流された電源電圧
でＬＥＤが点灯されたのと同じ状態となっている。For example, a plurality of LEs are connected in series with the current limiting element Z1.
When the anode terminal A1 of the LED array 1 to which D is connected is connected to one end S1 of the AC power supply AC, as shown in FIG. 2A, when the voltage exceeds a predetermined voltage Vt determined by the forward drop voltage of the LED, the current limiting element Current I limited by Z1
z1 flows to the LED, and the LED emits light. At this time, due to the rectifying action of the LED, the state is the same as when the LED is turned on with the half-wave rectified power supply voltage.
【００１０】次に、例えば、限流素子Ｚ２に直列に複数
のＬＥＤを接続したＬＥＤアレイ２のアノード側端子Ａ
２を全波整流回路ＤＢの正出力端子Ｓ２に接続すると、
図２（ｂ）に示すように、ＬＥＤの順方向降下電圧によ
って決まる所定電圧Ｖｔを越えると限流素子Ｚ２により
制限された電流Ｉｚ２がＬＥＤに流れ、ＬＥＤが点灯発
光する。このとき、ＬＥＤアレイ１とＬＥＤアレイ２
が、同一仕様で構成されているとすると、ＬＥＤアレイ
２の各ＬＥＤに流れる電流の平均値は、ＬＥＤアレイ１
の各ＬＥＤに流れる電流の平均値の２倍となる。したが
って、端子Ｓ１、Ｓ２と端子Ａ１、Ａ２の接続の組み合
わせにより、段調光が可能となる。Next, for example, the anode terminal A of the LED array 2 in which a plurality of LEDs are connected in series with the current limiting element Z2.
2 to the positive output terminal S2 of the full-wave rectifier circuit DB,
As shown in FIG. 2B, when the voltage exceeds a predetermined voltage Vt determined by the forward voltage drop of the LED, the current Iz2 limited by the current limiting element Z2 flows to the LED, and the LED emits light. At this time, LED array 1 and LED array 2
Are the same, the average value of the current flowing through each LED of the LED array 2 is
Is twice the average value of the current flowing through each LED. Therefore, step dimming becomes possible by a combination of the connections of the terminals S1 and S2 and the terminals A1 and A2.
【００１１】（実施例２）図３に本発明の実施例２の回
路図を示す。本実施例の回路は、実施例１の全波整流回
路ＤＢの出力電圧を入力として、任意の電圧波形を発生
させる任意波形発生回路Ｗを設けて、その出力端子Ｓ
３，…，Ｓｎ（ｎは３以上の整数）をスイッチ手段ＳＷ
により各ＬＥＤアレイ１，…，ｍのアノード側端子Ａ
１，…，Ａｍに選択的に切り替え接続可能としている。
この任意波形発生回路Ｗからは、例えば図２（ｃ）に示
すような三角波、図２（ｄ）に示すようなＬＥＤアレイ
の順方向降下電圧の和より小さくならない脈流波形、図
２（ｅ）に示すような脈流の無い波形の直流電圧などを
出力する。これらの波形は、そのピーク値がＬＥＤアレ
イの順方向降下電圧の和より大きければ、図示された例
だけに限られるものではない。選択された任意の電圧波
形Ｖｓの場合に流れるＬＥＤ電流Ｉｚは、（任意波形電
圧−ＬＥＤの順方向降下電圧）／限流用抵抗で表され
る。(Embodiment 2) FIG. 3 shows a circuit diagram of Embodiment 2 of the present invention. The circuit of the present embodiment is provided with an arbitrary waveform generating circuit W that generates an arbitrary voltage waveform by using the output voltage of the full-wave rectifier circuit DB of the first embodiment as an input, and has an output terminal S
3,..., Sn (n is an integer of 3 or more)
, M, the anode side terminal A of each LED array 1,.
,... Am can be selectively switched and connected.
From the arbitrary waveform generation circuit W, for example, a triangular wave as shown in FIG. ), And outputs a DC voltage having a waveform without a pulsating flow. These waveforms are not limited to the illustrated example as long as their peak values are greater than the sum of the forward voltage drops of the LED array. The LED current Iz flowing in the case of the selected arbitrary voltage waveform Vs is represented by (arbitrary waveform voltage-LED forward drop voltage) / current limiting resistance.
【００１２】（実施例３）図４は本発明の実施例３の動
作波形図である。本実施例では、図３の回路において、
限流素子Ｚ１，…，Ｚｍとして、図６に示すような定電
流回路を用いた場合に、ＬＥＤに流れる電流波形を示し
ている。この場合、ＬＥＤに流れる電流は定電流とな
る。図中、（ａ）はＬＥＤアレイのアノード側端子を交
流電源ＡＣの一端Ｓ１に接続した場合、（ｂ）は全波整
流回路ＤＢの正出力端子Ｓ２に接続した場合、（ｃ）は
任意波形発生回路の三角波電圧に接続した場合、（ｄ）
はＬＥＤアレイの順方向降下電圧の和より小さくならな
い脈流波形、（ｅ）は脈流の無い波形の直流電圧に接続
した場合の動作をそれぞれ示している。(Embodiment 3) FIG. 4 is an operation waveform diagram of Embodiment 3 of the present invention. In this embodiment, in the circuit of FIG.
7 shows a current waveform flowing through the LED when a constant current circuit as shown in FIG. 6 is used as the current limiting elements Z1,..., Zm. In this case, the current flowing through the LED is a constant current. In the figure, (a) shows a case where the anode terminal of the LED array is connected to one end S1 of the AC power supply AC, (b) shows a case where it is connected to the positive output terminal S2 of the full-wave rectifier circuit DB, and (c) shows an arbitrary waveform. When connected to the triangular wave voltage of the generator, (d)
Shows a pulsating current waveform that does not become smaller than the sum of the forward drop voltages of the LED array, and (e) shows an operation when connected to a DC voltage having no pulsating waveform.
【００１３】（実施例４）また、特に図示しないが、各
ＬＥＤアレイ１，２，…，ｍの発光色、個数を任意に設
定することにより、任意の発光色または調光段数の設定
が可能となる。(Embodiment 4) Although not particularly shown, it is possible to arbitrarily set the luminescent color or the number of dimming stages by arbitrarily setting the luminescent color and the number of each of the LED arrays 1, 2, ..., m. Becomes
【００１４】[0014]
【発明の効果】請求項１の発明によれば、複数列のＬＥ
Ｄアレイのそれぞれについて、交流電源による半波通電
又は全波整流回路による全波通電のいずれかを選択でき
るので、簡単な回路構成で段調光が可能となる。請求項
２又は３の発明によれば、任意波形発生回路を設けたこ
とにより、各ＬＥＤアレイについて、全波通電と半波通
電による２段階の調光に比べてさらに多段階の調光が可
能となる。According to the first aspect of the present invention, a plurality of rows of LEs are provided.
Either half-wave energization by an AC power supply or full-wave energization by a full-wave rectifier circuit can be selected for each of the D arrays, so that dimming can be performed with a simple circuit configuration. According to the second or third aspect of the present invention, by providing the arbitrary waveform generating circuit, it is possible to perform dimming in multiple stages for each LED array as compared with dimming in two stages by full-wave energization and half-wave energization. Becomes
【００１５】請求項４又は５の発明によれば、発光ダイ
オードの個数や発光色を任意に選択することにより調光
／調色が可能となる。請求項６又は７の発明によれば、
各発光ダイオードに流れる電流のピーク値を制限するこ
とができる。According to the fourth or fifth aspect of the present invention, light control / color control can be performed by arbitrarily selecting the number of light emitting diodes and the color of light emitted. According to the invention of claim 6 or 7,
The peak value of the current flowing through each light emitting diode can be limited.
【図１】本発明の実施例１の回路図である。FIG. 1 is a circuit diagram of a first embodiment of the present invention.
【図２】本発明の実施例１の動作説明のための波形図で
ある。FIG. 2 is a waveform chart for explaining the operation of the first embodiment of the present invention.
【図３】本発明の実施例２の回路図である。FIG. 3 is a circuit diagram according to a second embodiment of the present invention.
【図４】本発明の実施例３の動作説明のための波形図で
ある。FIG. 4 is a waveform chart for explaining the operation of the third embodiment of the present invention.
【図５】従来例１の回路図である。FIG. 5 is a circuit diagram of Conventional Example 1.
【図６】従来例２の回路図である。FIG. 6 is a circuit diagram of a second conventional example.
【図７】従来例３の回路図である。FIG. 7 is a circuit diagram of a third conventional example.
１，２，…，ｍ ＬＥＤアレイ ＳＷ スイッチ手段 ＡＣ 交流電源 ＤＢ 全波整流回路 Ｚ１，…，Ｚｍ 限流要素 1, 2,..., M LED array SW switch means AC AC power supply DB Full-wave rectifier circuit Z1,.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 杉本 勝 大阪府門真市大字門真1048番地 松下電工 株式会社内 (72)発明者 木村 秀吉 大阪府門真市大字門真1048番地 松下電工 株式会社内 (72)発明者 日妻 晋二 大阪府門真市大字門真1048番地 松下電工 株式会社内 (72)発明者 張 ティンティ 大阪府門真市大字門真1048番地 松下電工 株式会社内 Ｆターム(参考） 3K073 AA00 AA30 AA58 AB01 CA01 CJ17 CJ18 CJ19 5F041 BB03 BB04 BB09 DC83 FF11 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaru Sugimoto 1048 Odakadoma, Kadoma-shi, Osaka Matsushita Electric Works, Ltd. Inventor Shinji Hizuma 1048 Kadoma Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd. CJ18 CJ19 5F041 BB03 BB04 BB09 DC83 FF11
Claims (7)
と限流要素とを直列に接続して成るＬＥＤアレイを複数
列備え、交流電源を全波整流する全波整流回路の一方の
直流出力端子に各ＬＥＤアレイの各一端を共通接続し、
各ＬＥＤアレイの各他端をそれぞれ前記全波整流回路の
他方の直流出力端子又は前記交流電源の一端のいずれか
に選択的に切り替え接続するスイッチ手段を設けたこと
を特徴とする照明装置。An LED array comprising one or more light emitting diodes and a current limiting element connected in series is provided at a DC output terminal of one of a full-wave rectifier circuit for full-wave rectification of an AC power supply. Connect one end of each LED array in common,
A lighting device, comprising: switch means for selectively switching the other end of each LED array to either the other DC output terminal of the full-wave rectifier circuit or one end of the AC power supply.
接続されて前記一方の直流出力端子を基準電位として任
意の電圧波形を発生させる任意波形発生回路を備え、前
記スイッチ手段は、各ＬＥＤアレイの各他端をそれぞれ
前記全波整流回路の他方の直流出力端子又は前記交流電
源の一端、又は前記任意波形発生回路の出力端子のいず
れかに選択的に切り替え接続する手段であることを特徴
とする請求項１記載の照明装置。2. An arbitrary waveform generating circuit connected between the DC output terminals of the full-wave rectifier circuit to generate an arbitrary voltage waveform using the one DC output terminal as a reference potential, wherein the switch means includes an LED. The other end of the array is selectively connected to one of the other DC output terminal of the full-wave rectifier circuit, one end of the AC power supply, or the output terminal of the arbitrary waveform generation circuit. The lighting device according to claim 1.
イの順方向降下電圧よりも高い電圧ピーク値を有する１
つ又は複数の電圧波形を発生させる回路であることを特
徴とする請求項２記載の照明装置。3. The circuit of claim 1, wherein the arbitrary waveform generating circuit has a voltage peak value higher than a forward voltage drop of each LED array.
The lighting device according to claim 2, wherein the lighting device is a circuit that generates one or a plurality of voltage waveforms.
イオードの個数はアレイ毎にそれぞれ異なる個数に設定
されていることを特徴とする請求項１乃至３のいずれか
に記載の照明装置。4. The lighting device according to claim 1, wherein the number of light emitting diodes constituting each of said LED arrays is set to a different number for each array.
イオードの発光色はアレイ毎にそれぞれ異なる発光色が
選択されていることを特徴とする請求項１乃至３のいず
れかに記載の照明装置。5. The lighting device according to claim 1, wherein a light emission color of a light emitting diode constituting each of said LED arrays is different for each array.
に流れる電流を制限する限流素子であることを特徴とす
る請求項１乃至３のいずれかに記載の照明装置。6. The lighting device according to claim 1, wherein each of the current limiting elements is a current limiting element that limits a current flowing through each light emitting diode.
に流れる電流を制御する定電流回路であることを特徴と
する請求項１乃至３のいずれかに記載の照明装置。7. The lighting device according to claim 1, wherein each of the current limiting elements is a constant current circuit that controls a current flowing through each of the light emitting diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20095198A JP3767181B2 (en) | 1998-07-15 | 1998-07-15 | Lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20095198A JP3767181B2 (en) | 1998-07-15 | 1998-07-15 | Lighting device |
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| Publication Number | Publication Date |
|---|---|
| JP2000030877A true JP2000030877A (en) | 2000-01-28 |
| JP3767181B2 JP3767181B2 (en) | 2006-04-19 |
Family
ID=16433030
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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