JP2003188415A - Led lighting device - Google Patents

Led lighting device

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Publication number
JP2003188415A
JP2003188415A JP2001384418A JP2001384418A JP2003188415A JP 2003188415 A JP2003188415 A JP 2003188415A JP 2001384418 A JP2001384418 A JP 2001384418A JP 2001384418 A JP2001384418 A JP 2001384418A JP 2003188415 A JP2003188415 A JP 2003188415A
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JP
Japan
Prior art keywords
led
leds
temperature
led1
lighting device
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Pending
Application number
JP2001384418A
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Japanese (ja)
Inventor
Shinichi Ichida
真一 市田
Original Assignee
Asahi Matsushita Electric Works Ltd
朝日松下電工株式会社
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Application filed by Asahi Matsushita Electric Works Ltd, 朝日松下電工株式会社 filed Critical Asahi Matsushita Electric Works Ltd
Priority to JP2001384418A priority Critical patent/JP2003188415A/en
Publication of JP2003188415A publication Critical patent/JP2003188415A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED lighting device which has a small change in light quantity since power is turned on. <P>SOLUTION: The LED lighting device has LEDs 1, a control section (microcomputer) 2 capable of controlling currents applied to the LEDs 1, and a means for practically detecting temperatures of the LEDs 1. Based on the characteristics of 'ambient temperature (Ta) - luminous intensity (IV)' of the LEDs 1, the LEDs 1 are changed in currents to keep a substantially constant light quantity. Then, the temperatures of the LEDs are detected based on the measured values of forward currents (IF) and forward voltages (VF) of the LEDs 1. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、LED(発光ダイオード)点灯装置に関する。 BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention, LED (light emitting diode) regarding lighting apparatus. 【0002】 【従来の技術】LED点灯装置の用途の一つに、各種製造物品などの被検査対象を照射するものがある。 [0002] One of the applications of the Related Art LED lighting device, there is to irradiate the object to be inspected such as various articles of manufacture. そして、LEDで照射された前記被検査対象をCCDカメラで撮影し、その画像を処理して前記被検査対象を検査するものである。 Then, the irradiated with LED taken to be inspected by the CCD camera, is to inspect the object to be inspected by processing the image. そして、前記被検査対象を照射するには大きな光量が必要であり、多数のLEDを使用しているものが一般的である。 Then, the order to irradiate the object to be inspected is required a large amount of light, those that use multiple LED is common. 【0003】 【発明が解決しようとする課題】しかしながら、LED [0003] The object of the invention is to, however, LED
を多数使用することによる発熱が大きい。 Heating by using a large number of large. そもそもLE To begin with LE
Dは熱による光度(IV)の減少、順電圧(VF)の減少といった固有の特性があり、順電圧の低下に伴う順電流の増加、また、それに伴う順電圧の増加が発生し、光量が安定するまで時間がかかるため、検査開始までに相当な待ち時間を要するという解決すべき課題があることに着目されるべきである。 D decrease in intensity (IV) by heat, have specific characteristics such as reduction of the forward voltage (VF), an increase of the forward current caused by the decrease of the forward voltage and the increase in the forward voltage is generated accompanying it, the amount of light since it takes time to stabilize, it should be noted that there are problems to be solved that it takes a considerable waiting time before test start. 本発明はこのような解決すべき課題を鑑み、電源投入からの光量の変化が少ないLE The present invention has been made in view of the problems to be such solutions, change in the amount of light from the power-on is small LE
D点灯装置を提供することを目的とする。 And to provide a D lighting device. 【0004】 【課題を解決するための手段】本発明は、LEDと、L [0004] According to an aspect of the present invention, LED and, L
EDに流す電流を制御できる制御部と、LEDの温度を実質的に検出する手段を有し、LEDの「周囲温度(T A control unit that can control the current flowing in the ED, the means for substantially detecting the temperature of the LED, the LED "ambient temperature (T
a)−光度(IV)」の特性に基づいて、LEDの電流を変化させて光量を略一定に保持するLED点灯装置である。 a) - based on the characteristics of luminous intensity (IV) ", by changing the LED current is an LED lighting device which holds the light intensity substantially constant. なお、LEDの温度をLEDの順電流及び順電圧の測定値に基づいて検出してもよいし、LEDの近傍に配置した温度センサで検出してもよい。 Incidentally, the temperature of the LED may be detected based on the measurement value of the forward current and forward voltage of the LED, it may be detected by a temperature sensor disposed near the LED. 【0005】 【発明の実施の形態】次に、本発明の実施形態を説明するが、それはあくまで本発明に基づいて採択された例示的な実施形態であり、本発明をその実施形態に特有な事項に基づいて限定解釈してはならず、本発明の技術的範囲は、請求項に示した事項さらにはその事項と実質的に等価である事項に基づいて定めなければならない。 [0005] PREFERRED EMBODIMENTS Next is a description of embodiments of the present invention, it is an exemplary embodiment adopted in accordance with the present invention only, unique to the present invention to that embodiment must not be limited interpreted based on matters, the technical scope of the present invention further matter of the claims shall be determined based on the matter substantially equivalent and which matters. 【0006】図1〜6に示す実施形態は、LED1… [0006] The embodiment shown in FIGS. 1-6, LED1 ...
と、LED1…に流す電流を制御できる制御部(マイコン)2と、LED1…の温度を実質的に検出する手段を有し、LED1の「周囲温度(Ta)−光度(IV)」 When the control unit that can control the current flowing to the LED1 ... and (microcomputer) 2, comprising means for substantially detecting the LED1 ... temperature, LED1 of "ambient temperature (Ta) - intensity (IV)"
の特性に基づいて、LED1の電流を変化させて光量を略一定に保持するLED点灯装置である。 Based on the characteristics, a LED lighting device which holds the amount of light by changing the current of the LED1 substantially constant. そして、LE Then, LE
D1の温度をLED1の順電流(IF)及び順電圧(V The temperature of the D1 LED1 forward current (IF) and the forward voltage (V
F)の測定値に基づいて検出している。 Is detected based on the measurement values ​​of F). 【0007】本装置は図1に示す外観のように、多数のLED1…をリング状に実装したLED光源ユニット3 [0007] The apparatus as appearance shown in FIG. 1, LED light source unit 3 which implements a number of LED1 ... to ring
と、制御ユニット4で構成され、制御ユニット4にはL If, it consists of a control unit 4, the control unit 4 L
ED1…の明るさを調整する「明るさ調整スイッチ」 ED1 ... to adjust the brightness of the "brightness adjustment switch"
(UP/DOWN)5と、調整して決めた明るさを維持させる「明るさ設定スイッチ」6が設けられている。 And (UP / DOWN) 5, adjusted to "brightness setting switch" 6 to maintain the brightness was determined is provided. そして、 And,
図2の波形のようにLED1…はパルス駆動され、その LED1 ... is pulsed as shown in the waveform of FIG. 2, the
ON DUTYはTON/Tで表わされる。 ON DUTY is represented by TON / T. また、図3のように、 In addition, as shown in FIG. 3,
「明るさ調整スイッチ」(UP/DOWN)5の調整範囲は例えば、ON DUTY=30〜70%の範囲で可変できる。 "Brightness Adjustment Switch" (UP / DOWN) 5 of the adjustment range, for example, can be varied by ON DUTY = 30 to 70% range. 【0008】図4は回路ブロック図であり、制御部2は [0008] Figure 4 is a circuit block diagram, the control unit 2
DC5Vで動作し、制御部2のLED出力はトランジスタQ1を介して電流制限抵抗7…を含むLED1…の直並列回路を駆動し、これらの直並列回路にはDC12Vが供給されている。 Works with DC5V, LED output control section 2 drives the LED1 ... series-parallel circuit including a current limiting resistor 7 ... via the transistor Q1, in these series-parallel circuit is supplied with DC12V. また、制御部2は、トランジスタQ1のエミッタに挿入した抵抗R1に発生する電圧でLED1…に流れる電流の総和を検出し、また、一組の直列LED1…両端間の電圧を検出している。 The control unit 2 detects the sum of the currents flowing in the voltage generated across the resistor R1 inserted to the emitter of the transistor Q1 to LED1 ..., also detects the voltage between a pair of series LED1 ... ends. 制御部2のLED出力端子はPW LED output terminal of the control unit 2 PW
M制御信号が出力されており、出力Table Noは0〜10 M control signals are output, the output Table No 0-10
0まで制御できるものとする。 And it can control up to 0. この範囲はON DUTYとして0から1まで0.01刻みで100段階に対応しているが、「明るさ調整スイッチ」5によるLED出力の制御は前述の範囲に対応してTable Noを30〜70としている。 This range corresponds to 100 steps from 0 to 1 in 0.01 increments as ON DUTY, control of the LED output by the "brightness adjustment switch" 5 of Table No in response to the above-described range 30-70 It is set to. なお、一つのLED1の順電流IFは抵抗R1間の電圧をその抵抗値で割り、さらにLED1…の並列回路数の5で割ることで、求められる。 Incidentally, the forward current IF of one LED1 divide the voltage across the resistor R1 in its resistance, and further, by dividing by 5 the LED1 ... number of parallel circuits is determined. また、一つのLED In addition, one of the LED
1の順電圧VFは一組の直列接続LED1…のアノード−カソード間の電圧を測定して、4で割ることにより算出する。 1 forward voltage VF is a set of series connected LED1 ... anode of - by measuring the voltage between the cathode is calculated by dividing by 4. 【0009】本実施形態において、LED1…の明るさを所望の明るさを維持するには電源投入後、LED1… [0009] In this embodiment, after power-on LED1 ... brightness To maintain the desired brightness, LED1 ...
の明るさを「明るさ調整スイッチ」5にて所望の明るさに調整し、「明るさ設定スイッチ」6を押すよい。 Of the brightness is adjusted to the desired brightness in the "brightness adjustment switch" 5, good press the "brightness setting switch" 6. そうすると、時間が経ってLED1…の温度が上昇したり、 Then, it can increase LED1 ... temperature of over time,
周囲温度が変化したりしても、設定された明るさを実質的に維持できる。 Even when the ambient temperature or changes can substantially maintain the brightness is set. 【0010】使用されるLED1の特性は図7に示され、温度Ta25℃での順電圧VFと順電流IFの関係は、VF=a×IF+b(a、bは正の値で、この例ではa=10、b=1.65)と近似的に表わすことができる。 [0010] Characteristics of LED1 used is shown in Figure 7, the forward voltage relationship of VF and the forward current IF at a temperature Ta25 ° C. is, VF = a × IF + b (a, b is a positive value, in this example a = 10, b = 1.65) and can be approximately represented. また、順電圧VFの温度特性をθ(V/℃)(θ Further, the temperature characteristic of the forward voltage VF θ (V / ℃) (θ
は負の値)とすると、LED1…の温度Ta℃での順電圧VFと順電流IFの関係は、VF=(a×IF+b) When the negative value), LED1 ... the relationship of the forward voltage VF and the forward current IF at a temperature Ta ° C. of, VF = (a × IF + b)
+θ×(Ta−25℃)となり、これを変形して、温度Ta={(VF−a×IF−b)/θ}+25℃となり、VF、IFからLED1…の温度Taを求められる。 + Θ × (Ta-25 ℃), and the deformed this temperature Ta = {(VF-a × IF-b) / θ} + 25 ℃, and the VF, is from IF seek LED1 ... temperature Ta of the. 【0011】LED1の明るさを調節し、明るさ設定スイッチ6を押すと、制御部2は順電流IFと順電圧VF [0011] Adjust the brightness of LED1, pressing the brightness setting switch 6, the control unit 2 forward current IF and forward voltage VF
を測定検出し、明るさ設定スイッチ6を押した時のLE LE when the detected measurement, press the brightness setting switch 6
D1の温度を算出する。 To calculate the temperature of the D1. この温度をTsetとする。 This temperature is Tset. 制御部2は10ms毎に順電流IFと順電圧VFを検出(測定)し、随時現在のLED1の温度を算出する。 The control unit 2 detects (measures) the forward current IF and forward voltage VF at every 10 ms, and calculates the temperature of the needed current LED1. この温度をTnowとする。 This temperature is Tnow. 光度IVの温度特性は図7のように負の特性を示すため、TsetとTnowの値を比較し、Tset<Tnowのときは、LED1の駆動 Since the temperature characteristic of the luminous intensity IV is showing a negative characteristic as shown in FIG. 7, compare the value of Tset and Tnow, when the Tset <Tnow, driving the LED1
ON DUTYを増加させ、Tset>Tnowのときは、L Increase the ON DUTY, when the Tset> Tnow, L
ED1の駆動ON DUTYを低下させる。 Lowering the driving ON DUTY of ED1. このことを10m 10m this thing
s毎に繰り返すことによりLED1の光量を一定に保つことができる。 By repeating each s can be kept light intensity of LED1 constant. これらの動作は図5と図6のフローチャートで示される。 These operations are shown in the flowchart of FIG. 5 and FIG. 6. 【0012】図8と図9は他の実施形態であり、LED [0012] Figures 8 and 9 are other embodiments, LED
1…の温度をLED1…の近傍に配置したサーミスタなどの温度センサ11で直接検出している。 Are directly detected 1 ... the temperature at the temperature sensor 11, such as LED1 ... thermistor disposed in the vicinity of. 【0013】本発明による「明るさ-点灯時間特性」は従来の「明るさ-点灯時間特性」に比べてを図10に示すように大きく改善され、電源投入からの光量の変化が非常に少ないLED点灯装置が得られる。 [0013] The present invention according to the "brightness - lighting time property" conventional - are improved as shown in FIG. 10 larger than the "brightness lighting time characteristics", very little change in the amount of light from power LED lighting device is obtained.

【図面の簡単な説明】 【図1】本発明の実施形態を示す外観図【図2】同パルス駆動波形図【図3】同明るさ調整範囲図【図4】同回路ブロック図【図5】同第一フロー図【図6】同第一フローのX−Yと繋がる第二フロー図【図7】LEDの特性図【図8】他の実施形態によるLED光源ユニットの正面図【図9】同回路ブロック図【図10】本発明と従来例の明るさの経時特性を示す対比図【符号の説明】 図1〜6に示す実施形態は、LED1…と、LED1… External view Figure 2 the pulse driving waveform diagram Figure 3 the brightness adjustment range view [4] This circuit block diagram showing an embodiment of the BRIEF DESCRIPTION OF THE DRAWINGS [Figure 1] The present invention Figure 5 a front view of the LED light source unit according to the second flowchart 7 LED characteristic diagram [8] other embodiments to connect with X-Y of the first flow diagram FIG. 6 the first flow 9 embodiment shown in comparison diagram [eXPLANATION oF sYMBOLS] Figures 1-6 showing time characteristic of the circuit block diagram 10 shows the present invention and the conventional example brightness of, LED1 ... and, LED1 ...
に流す電流を制御できる制御部(マイコン)2と、LE And a control unit (microcomputer) 2 capable of controlling the current flowing in, LE
D1…の温度を実質的に検出する手段を有し、LED1 And means for substantially detecting the D1 ... temperature, LED1
の「周囲温度(Ta)−光度(IV)」の特性に基づいて、LED1の電流を変化させて光量を略一定に保持するLED点灯装置である。 Of - based on the characteristics of the "ambient temperature (Ta) intensity (IV)", a LED lighting device which holds the amount of light by changing the current of the LED1 substantially constant. そして、LED1の温度をL Then, the temperature of the LED1 L
ED1の順電流(IF)及び順電圧(VF)の測定値に基づいて検出している。 It is detected based on the measurement values ​​of ED1 forward current (IF) and the forward voltage (VF).

Claims (1)

  1. 【特許請求の範囲】 【請求項1】 LEDと、LEDに流す電流を制御できる制御部と、LEDの温度を実質的に検出する手段を有し、LEDの「周囲温度(Ta)−光度(IV)」の特性に基づいて、LEDの電流を変化させて光量を略一定に保持するLED点灯装置。 All Claims What is claimed is: 1. A LED, and a control unit that can control the current flowing through the LED, and means for substantially detecting the temperature of the LED, the LED "ambient temperature (Ta) - intensity ( based on the characteristics of the IV) ", LED lighting device which holds the light intensity substantially constant the LED current is changed. 【請求項2】 請求項1において、LEDの温度をLE 2. The method of claim 1, the temperature of the LED LE
    Dの順電流及び順電圧の測定値に基づいて検出するLE LE be detected based on the measured value of the forward current and forward voltage of the D
    D点灯装置。 D lighting device. 【請求項3】 請求項1において、LEDの温度をLE 3. The method of claim 1, the temperature of the LED LE
    Dの近傍に配置した温度センサで検出するLED点灯装置。 LED lighting apparatus detected by the temperature sensor disposed in the vicinity of D.
JP2001384418A 2001-12-18 2001-12-18 Led lighting device Pending JP2003188415A (en)

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