JP5513801B2 - Illumination device and dimming method of illumination device - Google Patents

Illumination device and dimming method of illumination device Download PDF

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JP5513801B2
JP5513801B2 JP2009179644A JP2009179644A JP5513801B2 JP 5513801 B2 JP5513801 B2 JP 5513801B2 JP 2009179644 A JP2009179644 A JP 2009179644A JP 2009179644 A JP2009179644 A JP 2009179644A JP 5513801 B2 JP5513801 B2 JP 5513801B2
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light emission
light
emission amount
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emitting elements
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健一 入江
和憲 木寺
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Panasonic Corp
Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は、異なる色の光を合成して所望の色度の光を得る照明装置及びその調光方法に関するものである。   The present invention relates to an illuminating device that combines light of different colors to obtain light of a desired chromaticity, and a dimming method thereof.

従来から、液晶ディスプレイ用バックライト装置などの照明装置には、光源として発光ダイオード（ＬＥＤ）が用いられている。この照明装置は、一般に、赤色（Ｒ）、緑色（Ｇ）、青色（Ｂ）、琥珀色（Ａ）等の色をそれぞれ発光する複数のＬＥＤを備え、これらのＬＥＤを発光させて各色の光を合成し、各ＬＥＤの光出力を調整することにより、任意の色度の合成光を実現している。そして、照明装置は、各色のＬＥＤが発する光を一緒に計測可能な光検出素子を備え、この光検出素子が計測した発光量を各ＬＥＤの光出力へフィードバックすることにより、合成光の色度を調整する。   Conventionally, a light emitting diode (LED) is used as a light source in an illumination device such as a backlight device for a liquid crystal display. This lighting device generally includes a plurality of LEDs that emit red (R), green (G), blue (B), amber (A), and the like, and emits these LEDs to emit light of each color. Are combined and the light output of each LED is adjusted to realize combined light of an arbitrary chromaticity. The illuminating device includes a light detection element that can measure the light emitted from the LEDs of each color together, and feeds back the light emission amount measured by the light detection element to the light output of each LED, so that the chromaticity of the combined light is obtained. Adjust.

上記したフィードバック制御方法の１例として、光検出素子による計測値を、各色のＬＥＤに流す電流の大きさへフィードバックする方法がある。しかし、この方法では、ＬＥＤ電流の調節を高精度に行う必要があるため、ＬＥＤ電流制御回路が複雑になり、照明装置の低コスト化が難しくなってしまう。   As an example of the feedback control method described above, there is a method of feeding back the measurement value obtained by the light detection element to the magnitude of the current flowing through each color LED. However, in this method, since it is necessary to adjust the LED current with high accuracy, the LED current control circuit becomes complicated, and it is difficult to reduce the cost of the lighting device.

これに対して、ＬＥＤ電流は既定電流とし、各ＬＥＤの発光／非発光を周期的に制御し、１周期に占める各ＬＥＤの発光時間の割合（オンデューティ比）を調整するパルス幅変調（ＰＷＭ）によって光出力を制御する方法がある（例えば、特許文献１参照）。   On the other hand, the LED current is a predetermined current, and the pulse width modulation (PWM) that periodically controls the light emission / non-light emission of each LED and adjusts the ratio of light emission time (on-duty ratio) of each LED in one cycle. ) To control the light output (see, for example, Patent Document 1).

特許文献１では、各ＬＥＤのオンデューティ比を維持しつつ、一部のＬＥＤの発光時間の開始タイミングをシフトさせ、各ＬＥＤの発光時間が互いに重複する各時点及び重複しない各時点においてＬＥＤの発光量を測定し、当該各時点における発光量の測定値の差分から各ＬＥＤの発光量を算出している。   In Patent Document 1, the start timing of the light emission time of some LEDs is shifted while maintaining the on-duty ratio of each LED, and the light emission of the LEDs at each time point where the light emission times of each LED overlap each other and each time point where they do not overlap each other. The amount of light emitted from each LED is calculated from the difference between the measured values of the amount of light emitted at each time point.

特開２００８−２１０８５３号公報JP 2008-210853 A

しかし、特許文献１では、各色のオンデューティ比が変化してしまうと、各ＬＥＤの発光時間が互いに重複する各時点及び重複しない各時点が現れるタイミングも変化してしまう。また、各色のオンデューティ比が変化してしまうと、発光時間の開始タイミングのシフト方法も変更せざるを得ない場合も生じる。したがって、各時点における発光量の測定値の差分から各ＬＥＤの発光量を算出する場合に、どの時点での発光量の測定値の差分を取ればよいかを判断することが困難となってしまう。   However, in Patent Document 1, if the on-duty ratio of each color changes, the timings at which the light emission times of the LEDs overlap each other and the times at which each LED does not overlap also change. In addition, if the on-duty ratio of each color changes, there may be a case where the method of shifting the start timing of the light emission time must be changed. Therefore, when calculating the light emission amount of each LED from the difference in the measurement value of the light emission amount at each time point, it becomes difficult to determine at which time point the difference in the measurement value of the light emission amount should be taken. .

本発明は、上記問題点に鑑みて成されたものであり、その目的は、発光量の測定値の差分から各発光素子の発光量を算出する場合に、どの測定タイミングにおける発光量の測定値の差分を取ればよいかを容易に判断することができる照明装置及びその調光方法を提供することである。   The present invention has been made in view of the above problems, and its purpose is to measure the light emission amount at any measurement timing when calculating the light emission amount of each light-emitting element from the difference between the light emission amount measurement values. It is to provide an illuminating device and a dimming method thereof that can easily determine whether or not to take the difference.

本発明の第１の特徴は、異なる色の光を合成して所望の色度の光を得る照明装置である。この照明装置は、異なる色の光をそれぞれ発する複数の発光素子と、複数の発光素子による合成光の色度が所望の色度になるように、発光素子の各々について、１周期における発光回数を制御する発光回数制御部と、１周期内において、発光回数制御部により制御された発光回数だけ、発光素子の各々の発光及び非発光を繰返すオン／オフ制御部と、複数の発光素子が発する光の発光量を一緒に計測する受光素子と、受光素子により計測された発光量から、複数の発光素子のいずれか１つの発光素子の発光量を算出する発光量算出部と、所望の色度を得るための各色の混色比率データを格納する混色比率記憶部とを備える。オン／オフ制御部は、複数の発光素子のうちの２つ以上の発光素子の発光及び非発光を同じタイミングで繰返す。発光量算出部は、発光及び非発光を同じタイミングで繰返す２つ以上の発光素子が総て発光状態となった時に受光素子により計測された発光量から、発光及び非発光を同じタイミングで繰返す２つ以上の発光素子のうち、いずれか１つの発光素子のみが非発光状態となった時に受光素子により計測された発光量を減算して１つの発光素子の発光量を算出する。発光回数制御部は、当該１つの発光素子の発光量及び混色比率記憶部に記憶された混色比率データに基づいて、当該１つの発光素子の発光回数を制御する。   A first feature of the present invention is an illumination device that combines light of different colors to obtain light of a desired chromaticity. In this lighting device, a plurality of light emitting elements that emit light of different colors, and the number of times of light emission in one cycle are set for each of the light emitting elements so that the chromaticity of the combined light from the plurality of light emitting elements becomes a desired chromaticity. A light emission number control unit to be controlled, an on / off control unit that repeats light emission and non-light emission of each light emitting element by the number of light emission times controlled by the light emission number control unit within one cycle, and light emitted by a plurality of light emitting elements A light-receiving element that measures the amount of light emitted together, a light-emission amount calculation unit that calculates the light-emission amount of any one light-emitting element from the light-emission amount measured by the light-receiving element, and a desired chromaticity And a color mixture ratio storage unit for storing color mixture ratio data of each color to be obtained. The on / off controller repeats light emission and non-light emission of two or more light emitting elements among the plurality of light emitting elements at the same timing. The light emission amount calculation unit repeats light emission and non-light emission at the same timing from the light emission amount measured by the light receiving element when two or more light emitting elements that repeat light emission and non-light emission at the same timing are all in the light emission state. The light emission amount of one light emitting element is calculated by subtracting the light emission amount measured by the light receiving element when only one of the light emitting elements is in a non-light emitting state. The light emission number control unit controls the light emission number of the one light emitting element based on the light emission amount of the one light emitting element and the color mixing ratio data stored in the color mixing ratio storage unit.

本発明の第１の特徴によれば、発光及び非発光を同じタイミングで繰返す発光素子のうち、いずれか１つの発光素子のみが逆の動作を行う前後の発光量の差分を当該１つの発光素子の発光量として算出できるため、各発光素子の発光量を算出するために、どの測定タイミングにおける発光量の測定値の差分を取ればよいかを容易に判断することができる。   According to the first feature of the present invention, among the light emitting elements that repeat light emission and non-light emission at the same timing, the difference in light emission amount before and after only one of the light emitting elements performs the reverse operation is calculated as the one light emitting element. Therefore, in order to calculate the light emission amount of each light emitting element, it is possible to easily determine at which measurement timing the difference between the measurement values of the light emission amount should be taken.

本発明の第１の特徴において、オン／オフ制御部は、発光及び非発光を同じタイミングで繰返す発光素子のうち、いずれか１つの発光素子のみが逆の動作を行った場合に限り、発光量算出部に対してトリガー信号を送信し、発光量算出部は、トリガー信号を受信する前に受光素子により計測された発光量と、トリガー信号を受信した後に受光素子により計測された発光量との差分を、１つの発光素子の発光量として算出してもよい。このように、発光及び非発光を同じタイミングで繰返す発光素子のうち、いずれか１つの発光素子のみが逆の動作を行うか否かを監視することにより、各発光素子の発光量を算出するために、どの測定タイミングにおける発光量の測定値の差分を取ればよいかを容易に判断することができる。   In the first feature of the present invention, the on / off control unit emits light only when only one of the light emitting elements that repeats light emission and non-light emission at the same timing performs the reverse operation. A trigger signal is transmitted to the calculation unit, and the light emission amount calculation unit calculates a light emission amount measured by the light receiving element before receiving the trigger signal and a light emission amount measured by the light receiving element after receiving the trigger signal. The difference may be calculated as the light emission amount of one light emitting element. As described above, the light emission amount of each light emitting element is calculated by monitoring whether only one of the light emitting elements that repeats light emission and non-light emission at the same timing performs the reverse operation. In addition, it is possible to easily determine at which measurement timing the difference between the measurement values of the light emission amount should be taken.

本発明の第２の特徴は、異なる色の光を合成して所望の色度の光を得る照明装置の調光方法である。この調光方法は、異なる色の光をそれぞれ発する複数の発光素子の発光量を計測する第１の段階と、計測した発光量から各発光素子の発光量を算出する第２の段階と、異なる色の光を合成して所望の色度を得るための各色の混色比率及び算出された発光量に基づいて、１周期における各発光素子の発光回数を演算する第３の段階と、各発光素子の発光及び非発光を、演算された発光回数だけ繰返す第４の段階とを備える。第４の段階において、複数の発光素子のうちの２つ以上の発光素子の発光及び非発光を同じタイミングで繰返す。第２の段階において、発光及び非発光を同じタイミングで繰返す２つ以上の発光素子が総て発光状態となった時に計測された発光量から、発光及び非発光を同じタイミングで繰返す２つ以上の発光素子のうち、いずれか１つの発光素子のみが非発光状態となった時に計測された発光量を減算して１つの発光素子の発光量を算出する。   The second feature of the present invention is a dimming method for an illumination apparatus that combines light of different colors to obtain light of desired chromaticity. This dimming method is different from the first stage of measuring the light emission amounts of a plurality of light emitting elements that emit light of different colors, and the second stage of calculating the light emission amount of each light emitting element from the measured light emission amounts. A third stage for calculating the number of times of light emission of each light emitting element in one cycle based on the color mixture ratio of each color and the calculated light emission amount for obtaining desired chromaticity by combining the light of the colors, and each light emitting element A fourth stage in which the light emission and non-light emission are repeated by the calculated number of times of light emission. In the fourth stage, light emission and non-light emission of two or more light emitting elements among the plurality of light emitting elements are repeated at the same timing. In the second stage, two or more light emission and non-light emission are repeated at the same timing from the light emission amount measured when all of the two or more light emitting elements that repeat the light emission and the non-light emission are in the light emission state. The light emission amount of one light emitting element is calculated by subtracting the light emission amount measured when only one of the light emitting elements is in a non-light emitting state.

本発明の照明装置及びその調光方法によれば、発光量の測定値の差分から各発光素子の発光量を算出する場合に、どの測定タイミングにおける発光量の測定値の差分を取ればよいかを容易に判断することができる。   According to the illumination device and the dimming method of the present invention, when calculating the light emission amount of each light emitting element from the difference in the measurement value of the light emission amount, at which measurement timing should the difference in the measurement value of the light emission amount be taken? Can be easily determined.

本発明の実施の形態に係わる照明装置の構成を示すブロック図である。It is a block diagram which shows the structure of the illuminating device concerning embodiment of this invention. 図２（ａ）は各ＬＥＤ１〜ＬＥＤ４の発光／非発光の制御方法の一例を示すタイムチャートであり、図２（ｂ）は図２（ａ）における各ＬＥＤ１〜ＬＥＤ４の発光量の一例を示すグラフである。FIG. 2A is a time chart showing an example of a control method of light emission / non-light emission of each LED1 to LED4, and FIG. 2B shows an example of the light emission amount of each LED1 to LED4 in FIG. It is a graph. 図１の照明装置の調光方法の概略を示すフローチャートである。It is a flowchart which shows the outline of the light control method of the illuminating device of FIG. 図４（ａ）は図３のＳ０３段階における詳細な処理手順の一例を示すフローチャートであり、図４（ｂ）は図３のＳ０５段階における詳細な処理手順の一例を示すフローチャートである。4A is a flowchart showing an example of a detailed processing procedure in step S03 of FIG. 3, and FIG. 4B is a flowchart showing an example of a detailed processing procedure in step S05 of FIG. ＲＧＢ３色によって混色を行う場合におけるＲＧＢ各々の混合比率の一例を示す表である。It is a table | surface which shows an example of the mixing ratio of each RGB in the case of mixing colors by RGB 3 colors.

以下図面を参照して、本発明の実施の形態を説明する。図面の記載において同一部分には同一符号を付している。   Embodiments of the present invention will be described below with reference to the drawings. In the description of the drawings, the same parts are denoted by the same reference numerals.

図１を参照して、本発明の実施の形態に係わる照明装置の構成を説明する。本発明の実施の形態に係わる照明装置は、異なる色の光をそれぞれ発する複数の発光素子の一例として、赤色（Ｒ：Red）、緑色（Ｇ：Green）、青色（Ｂ：Blue）、及び琥珀色（Ａ：Amber）をそれぞれ発光する第１の発光ダイオード（以後、「ＬＥＤ」という）１１ａ、第２のＬＥＤ１１ｂ、第３のＬＥＤ１１ｃ、及び第４のＬＥＤ１１ｄを備える。照明装置は、第１〜第４のＬＥＤ１１ａ〜１１ｄを発光させて各色の光を合成し、第１〜第４のＬＥＤ１１ａ〜１１ｄの光出力を調整することにより、所望の色度の合成光を実現する。   With reference to FIG. 1, the structure of the illuminating device concerning embodiment of this invention is demonstrated. The illumination device according to the embodiment of the present invention includes red (R), green (G), blue (B), and blue as an example of a plurality of light-emitting elements that emit light of different colors. A first light emitting diode (hereinafter referred to as “LED”) 11a, a second LED 11b, a third LED 11c, and a fourth LED 11d each emitting a color (A: Amber) are provided. The illuminating device emits the first to fourth LEDs 11a to 11d to synthesize light of each color, and adjusts the light output of the first to fourth LEDs 11a to 11d, thereby generating synthesized light of desired chromaticity. Realize.

照明装置は、第１〜第４のＬＥＤ１１ａ〜１１ｄから成る発光部１１と、第１〜第４のＬＥＤ１１ａ〜１１ｄの各々について、１周期における発光回数を制御する発光回数制御部１２と、１周期内において、発光回数制御部１２により制御された発光回数だけ、第１〜第４のＬＥＤ１１ａ〜１１ｄの各々の発光及び非発光を繰返すＬＥＤ管理部１３（オン／オフ制御部）と、発光部１１が発する光の発光量を一緒に計測する受光素子１４と、受光素子１４により計測された発光量から、第１〜第４のＬＥＤ１１の各々の発光量を算出する発光量算出部２１と、所望の色度を得るためのＲＧＢＡ各色の混色比率データを格納する混色比率記憶部１５と、ＬＥＤ管理部１３による制御の下で第１〜第４のＬＥＤ１１ａ〜１１ｄの各々を駆動するＬＥＤ駆動回路２４とを備える。   The illuminating device includes a light emitting unit 11 including the first to fourth LEDs 11a to 11d, a light emission number control unit 12 that controls the number of light emissions in one cycle, and one cycle for each of the first to fourth LEDs 11a to 11d. The LED management unit 13 (on / off control unit) that repeats light emission and non-light emission of each of the first to fourth LEDs 11a to 11d by the number of times of light emission controlled by the light emission number control unit 12, and the light emitting unit 11 A light receiving element 14 that measures the light emission amount of the light emitted by the light receiving element 14; a light emission amount calculating unit 21 that calculates the light emission amount of each of the first to fourth LEDs 11 from the light emission amount measured by the light receiving element 14; A color mixture ratio storage unit 15 for storing color mixture ratio data for each color of RGBA for obtaining a chromaticity of L, and L for driving each of the first to fourth LEDs 11a to 11d under the control of the LED management unit 13. And a D drive circuit 24.

ＬＥＤ管理部１３は、ＬＥＤ１１ａ〜１１ｄの各々の発光及び非発光を、１周期内において複数回繰り返す。１周期内で繰り返されるＬＥＤ１１ａ〜１１ｄの各々の発光時間及び非発光時間の長さは等しく設定されている。更に、ＬＥＤ管理部１３は、発光部１１から任意に選んだ２以上のＬＥＤの発光及び非発光を同じタイミングで繰返す。   The LED management unit 13 repeats light emission and non-light emission of each of the LEDs 11a to 11d a plurality of times within one cycle. The lengths of the light emission time and the non-light emission time of each of the LEDs 11a to 11d repeated within one cycle are set equal. Further, the LED management unit 13 repeats light emission and non-light emission of two or more LEDs arbitrarily selected from the light emitting unit 11 at the same timing.

発光回数制御部１２は、第１〜第４のＬＥＤ１１ａ〜１１ｄの各々について１周期における発光回数を制御する。なお、「１周期における発光回数」とは、１周期内で繰り返される発光及び非発光の回数を示す。１回の発光時間の長さ（単位時間）は等しく設定されているため、発光回数制御部１２は、１周期における発光回数を制御することにより、１周期に占める発光時間の割合（オンデューティ比）を制御することができる。ＬＥＤ管理部１３は、１周期内において、発光回数制御部１２により制御された発光回数だけ、ＬＥＤ１１ａ〜１１ｄの各々の発光及び非発光を繰返す。   The light emission number control unit 12 controls the number of light emission in one cycle for each of the first to fourth LEDs 11a to 11d. The “number of times of light emission in one cycle” indicates the number of times of light emission and non-light emission repeated in one cycle. Since the length (unit time) of one light emission time is set to be equal, the light emission number control unit 12 controls the number of light emission times in one cycle, whereby the ratio of the light emission time in one cycle (on-duty ratio) ) Can be controlled. The LED management unit 13 repeats light emission and non-light emission of each of the LEDs 11a to 11d by the number of times of light emission controlled by the light emission number control unit 12 within one cycle.

第１〜第４のＬＥＤ１１ａ〜１１ｄの各々が発する光は、総て１つの受光素子１４によって受光される。よって、第１〜第４のＬＥＤ１１ａ〜１１ｄの各々が単独で発光しているタイミングにおいて受光素子１４が測定した発光量は、第１〜第４のＬＥＤ１１ａ〜１１ｄの各々の発光量となり、第１〜第４のＬＥＤ１１ａ〜１１ｄのいずれか２以上のＬＥＤが発光しているタイミングにおいて受光素子１４が測定した発光量は、２以上のＬＥＤが発する光を合成した合成光の発光量となる。   The light emitted from each of the first to fourth LEDs 11 a to 11 d is received by one light receiving element 14. Therefore, the light emission amount measured by the light receiving element 14 at the timing when each of the first to fourth LEDs 11a to 11d emits light alone is the light emission amount of each of the first to fourth LEDs 11a to 11d, and the first The light emission amount measured by the light receiving element 14 at the timing when any two or more of the fourth LEDs 11a to 11d emit light is the light emission amount of the combined light obtained by combining the light emitted by the two or more LEDs.

発光量算出部２１は、受光素子１４から発光量として出力されるアナログ信号をデジタル信号（データ）へ変換するＡＤコンバータ３１と、変換された発光量のデータを一時的に記憶する発光量一時保持部３４と、発光量一時保持部３４に記憶されている発光量のデータを用いて、各ＬＥＤ１１ａ〜１１ｄの発光量を算出する発光量比較部３５と、発光量比較部３５により演算された各ＬＥＤ１１ａ〜１１ｄの発光量を一時的に記憶する発光量保持バッファ（Ｒ）３２ａ、発光量保持バッファ（Ｇ）３２ｂ、発光量保持バッファ（Ｂ）３２ｃ及び発光量保持バッファ（Ａ）３２ｄと、一定の時間を計数する第１のタイマ３３とを備える。   The light emission amount calculation unit 21 temporarily converts the analog signal output as the light emission amount from the light receiving element 14 into a digital signal (data), and temporarily stores the converted light emission amount data. Unit 34, a light emission amount comparison unit 35 that calculates the light emission amount of each of the LEDs 11a to 11d using the light emission amount data stored in the light emission amount temporary storage unit 34, and each of the light emission amount comparison units 35 that are calculated. A light emission amount holding buffer (R) 32a, a light emission amount holding buffer (G) 32b, a light emission amount holding buffer (B) 32c, and a light emission amount holding buffer (A) 32d, which temporarily store the light emission amounts of the LEDs 11a to 11d, are constant. And a first timer 33 that counts the time.

発光量一時保持部３４は、発光量保持バッファ（Ｒ，Ｂ）３６及び発光量保持バッファ（Ｇ，Ａ）３７を備える。発光量保持バッファ（Ｒ，Ｂ）３６及び３７は、それぞれ、複数の発光量のデータを同時に記憶することができ、第１のタイマ３３が計数する一定の時間間隔をおいて、ＡＤ変換された発光量のデータを繰返し記憶する。   The light emission amount temporary holding unit 34 includes a light emission amount holding buffer (R, B) 36 and a light emission amount holding buffer (G, A) 37. Each of the light emission amount holding buffers (R, B) 36 and 37 can simultaneously store a plurality of light emission amount data and is AD-converted at a constant time interval counted by the first timer 33. The light emission amount data is repeatedly stored.

発光量比較部３５は、発光及び非発光を同じタイミングで繰返す２つ以上のＬＥＤが総て発光状態となった時に受光素子１４により計測された発光量から、発光及び非発光を同じタイミングで繰返す２つ以上のＬＥＤのうち、いずれか１つのＬＥＤのみが非発光状態となった時に受光素子１４により計測された発光量を減算して１つのＬＥＤの発光量を算出する。発光量比較部３５の動作については、図２及び図４（ａ）を参照して詳細に説明する。ＬＥＤ管理部１３は、発光及び非発光を同じタイミングで繰返す２以上のＬＥＤのうち、いずれか１つのＬＥＤのみが非発光状態となるか否かを監視する。   The light emission amount comparison unit 35 repeats light emission and non-light emission at the same timing from the light emission amount measured by the light receiving element 14 when two or more LEDs that repeat light emission and non-light emission at the same timing are all in the light emission state. The light emission amount of one LED is calculated by subtracting the light emission amount measured by the light receiving element 14 when only one of the two or more LEDs is in a non-light emitting state. The operation of the light emission amount comparison unit 35 will be described in detail with reference to FIG. 2 and FIG. The LED management unit 13 monitors whether only one of the two or more LEDs that repeat light emission and non-light emission at the same timing is in a non-light emission state.

発光量保持バッファ３２ａ〜３２ｄは、発光量比較部３５により演算された発光量を、第１〜第４のＬＥＤ１１ａ〜１１ｄの発光量として、それぞれ保持する。   The light emission amount holding buffers 32a to 32d hold the light emission amounts calculated by the light emission amount comparison unit 35 as the light emission amounts of the first to fourth LEDs 11a to 11d, respectively.

混色比率記憶部１５には、第１〜第４のＬＥＤ１１ａ〜１１ｄによる合成光の色度が所望の色度になるためのＲＧＢＡ各色の混色比率のデータを記憶している。各ＬＥＤ１１ａ〜１１ｄの光出力の比率をＲＧＢＡ各色の混色比率に基づいて調整することにより、第１〜第４のＬＥＤ１１ａ〜１１ｄによる合成光の色度を所望の色度に調光することができる。ＲＧＢ３色による混色の場合、例えば、図５に示すように、ＲＧＢ各々の混合比率が、合成光の色種別（１、２、３、・・・）ごとにまとめられている。   The color mixture ratio storage unit 15 stores data of the color mixture ratios of the respective RGBA colors so that the chromaticity of the combined light by the first to fourth LEDs 11a to 11d becomes a desired chromaticity. By adjusting the ratio of the light output of each of the LEDs 11a to 11d based on the color mixture ratio of each RGBA color, the chromaticity of the combined light from the first to fourth LEDs 11a to 11d can be adjusted to a desired chromaticity. . In the case of mixed colors of three RGB colors, for example, as shown in FIG. 5, the mixing ratios of RGB are collected for each color type (1, 2, 3,...) Of the synthesized light.

発光回数制御部１２は、第１〜第４のＬＥＤ１１ａ〜１１ｄによる合成光の色度が所望の色度になるように、混色比率記憶部１５に記憶された混色比率データ及び発光量算出部２１により算出された発光量に基づいて、第１〜第４のＬＥＤ１１ａ〜１１ｄの発光回数を算出する発光回数演算部４１と、算出された第１〜第４のＬＥＤ１１ａ〜１１ｄの発光回数を保持する発光回数保持部２２と、保持されている発光回数に基づいて第１〜第４のＬＥＤ１１ａ〜１１ｄの発光回数を管理する発光回数管理部２３とを備える。   The light emission number control unit 12 mixes color mixture ratio data and the light emission amount calculation unit 21 stored in the color mixture ratio storage unit 15 so that the chromaticity of the combined light from the first to fourth LEDs 11a to 11d becomes a desired chromaticity. Based on the light emission amount calculated by the above, the light emission number calculation unit 41 for calculating the light emission number of the first to fourth LEDs 11a to 11d and the calculated light emission number of the first to fourth LEDs 11a to 11d are held. A light emission number holding unit 22 and a light emission number management unit 23 that manages the light emission number of the first to fourth LEDs 11a to 11d based on the held light emission number are provided.

発光回数演算部４１は、第１〜第４のＬＥＤ１１ａ〜１１ｄの光出力の比率が、混色比率記憶部１５に記憶されている所望の色度の混色比率になるように、発光量保持バッファ３２ａ〜３２ｄに記憶されている発光量に基づいて、第１〜第４のＬＥＤ１１ａ〜１１ｄの発光回数を算出する。発光量または発光回数が増加すれば光出力も増加するため、記憶されている発光量が少ない場合には発光回数を多くし、記憶されている発光量が多い場合には発光回数を少なくすることで、第１〜第４のＬＥＤ１１ａ〜１１ｄの光出力の比率を調整することができる。   The number-of-lights-emission calculating unit 41 emits the light amount holding buffer 32a so that the ratio of the light output of the first to fourth LEDs 11a to 11d becomes the color mixture ratio of the desired chromaticity stored in the color mixture ratio storage unit 15. The number of times of light emission of the first to fourth LEDs 11a to 11d is calculated based on the light emission amount stored in .about.32d. If the amount of light emitted or the number of times of light emission increases, the light output will also increase. Thus, the ratio of the light output of the first to fourth LEDs 11a to 11d can be adjusted.

なお、発光回数演算部４１は、第２のタイマ２５が計数する一定の時間間隔をおいて、発光回数の算出を繰返し実施する。第２のタイマ２５が計数する一定の時間間隔は、第１のタイマ３３が計数する一定の時間間隔よりも長い。   The light emission number calculation unit 41 repeatedly calculates the light emission number at a certain time interval counted by the second timer 25. The fixed time interval counted by the second timer 25 is longer than the fixed time interval counted by the first timer 33.

発光回数保持部２２は、第１のＬＥＤ１１ａの発光回数を保持する発光回数保持バッファ（Ｒ）４２ａと、第２のＬＥＤ１１ｂの発光回数を保持する発光回数保持バッファ（Ｇ）４２ｂと、第３のＬＥＤ１１ｃの発光回数を保持する発光回数保持バッファ（Ｂ）４２ｃと、第４のＬＥＤ１１ｄの発光回数を保持する発光回数保持バッファ（Ａ）４２ｄとを備える。ＬＥＤ管理部１３は、いずれか１つの発光回数保持バッファ４２ａ〜４２ｄを選択して、発光回数演算部４１により算出された発光回数のデータを書き込む。   The light emission number holding unit 22 includes a light emission number holding buffer (R) 42a for holding the light emission number of the first LED 11a, a light emission number holding buffer (G) 42b for holding the light emission number of the second LED 11b, and a third A light emission number holding buffer (B) 42c for holding the light emission number of the LED 11c and a light emission number holding buffer (A) 42d for holding the light emission number of the fourth LED 11d are provided. The LED management unit 13 selects any one of the light emission number holding buffers 42 a to 42 d and writes the data of the light emission number calculated by the light emission number calculation unit 41.

発光回数管理部２３は、発光回数保持バッファ４２ａ〜４２ｄが保持する発光回数が基準値として入力される基準値入力部４５と、発光回数を計数するカウンタ４６と、基準値入力部４５に入力された発光回数とカウンタ４６が計数する発光回数とを比較する比較器４７とを備える。カウンタ４６が計数する発光回数が基準値入力部４５に入力された発光回数に達した場合、発光回数管理部２３は、ＬＥＤ管理部１３及びＬＥＤ駆動回路２４に対して、カウンタ４６が計数する発光回数を出力する。   The light emission number management unit 23 is input to the reference value input unit 45 to which the light emission number held by the light emission number holding buffers 42 a to 42 d is input as a reference value, the counter 46 for counting the light emission number, and the reference value input unit 45. And a comparator 47 that compares the number of times of light emission with the number of times of light emission counted by the counter 46. When the number of times of light emission counted by the counter 46 reaches the number of times of light emission input to the reference value input unit 45, the light emission number management unit 23 emits light emitted by the counter 46 to the LED management unit 13 and the LED drive circuit 24. Output the number of times.

ＬＥＤ駆動回路２４は、発光回数管理部２３から出力された発光回数に基づいて、ＬＥＤ管理部１３による制御の下で第１〜第４のＬＥＤ１１ａ〜１１ｄの各々を駆動する。   The LED drive circuit 24 drives each of the first to fourth LEDs 11 a to 11 d under the control of the LED management unit 13 based on the number of light emission output from the light emission number management unit 23.

ＬＥＤ管理部１３は、各ＬＥＤ１１ａ〜１１ｄに流す電流を既定電流とし、各ＬＥＤ１１ａ〜１１ｄの発光／非発光を所定の発光回数だけ繰返すことにより、１周期に占める各ＬＥＤ１１ａ〜１１ｄの発光時間の割合（オンデューティ比）を調整する。すなわち、ＬＥＤ管理部１３は、このパルス幅変調（ＰＷＭ）によって各ＬＥＤ１１ａ〜１１ｄの光出力を調整する。   The LED management unit 13 sets the current flowing through the LEDs 11a to 11d as a predetermined current, and repeats the light emission / non-light emission of the LEDs 11a to 11d a predetermined number of times of light emission, so that the ratio of the light emission time of each LED 11a to 11d in one cycle Adjust (on-duty ratio). That is, the LED management unit 13 adjusts the light output of each of the LEDs 11a to 11d by this pulse width modulation (PWM).

また、ＬＥＤ管理部１３は、発光及び非発光を同じタイミングで繰返す２以上のＬＥＤの組み合わせを制御する。本発明の実施の形態においては、ＬＥＤ１１ａ及びＬＥＤ１１ｃの発光／非発光を同じタイミングで繰返し、ＬＥＤ１１ｂ及びＬＥＤ１１ｄの発光／非発光を同じタイミングで繰返す場合について説明する。この他にも、例えば、ＬＥＤ管理部１３は、総てのＬＥＤ１１ａ〜１１ｄの発光／非発光を同じタイミングで繰返しても構わない。   Further, the LED management unit 13 controls a combination of two or more LEDs that repeat light emission and non-light emission at the same timing. In the embodiment of the present invention, a case where light emission / non-light emission of the LED 11a and the LED 11c is repeated at the same timing and light emission / non-light emission of the LED 11b and the LED 11d is repeated at the same timing will be described. In addition, for example, the LED management unit 13 may repeat the light emission / non-light emission of all the LEDs 11a to 11d at the same timing.

このようにして、図１に示す照明装置は、受光素子１４が計測する各ＬＥＤ１１ａ〜１１ｄの発光量を、各ＬＥＤ１１ａ〜１１ｄのオンデューティ比へフィードバックすることにより、所望の色度の合成光を得る。   In this way, the illumination device shown in FIG. 1 feeds the combined light of desired chromaticity by feeding back the light emission amount of each LED 11a to 11d measured by the light receiving element 14 to the on-duty ratio of each LED 11a to 11d. obtain.

次に、図３を参照して、図１の照明装置の調光方法の概略を説明する。   Next, with reference to FIG. 3, the outline of the light control method of the illuminating device of FIG. 1 is demonstrated.

（イ）先ず、Ｓ０３段階において、受光素子１４は、第１〜第４のＬＥＤ１１ａ〜１１ｄの発光量を繰返し測定し、ＡＤ変換された複数の発光量のデータを発光量一時保持部３４に記憶する（第１の段階）。そして、発光及び非発光を同じタイミングで繰返す２つ以上のＬＥＤが総て発光状態となった時に受光素子１４により計測された発光量から、発光及び非発光を同じタイミングで繰返す２つ以上のＬＥＤのうち、いずれか１つのＬＥＤのみが非発光状態となった時に受光素子１４により計測された発光量を減算して１つのＬＥＤの発光量を算出する（第２の段階）。そして、発光量比較部３５により演算された当該１つのＬＥＤの発光量を、発光量保持バッファ３２ａ〜３２ｄに記憶する。上記した「１つのＬＥＤ」として、第１〜第４のＬＥＤ１１ａ〜１１ｄを順次当てはめていくことにより、第１〜第４のＬＥＤ１１ａ〜１１ｄの各々の発光量を計測し、発光量のデータを発光量保持バッファ３２ａ〜３２ｄにそれぞれ記憶することができる。   (A) First, in step S03, the light receiving element 14 repeatedly measures the light emission amounts of the first to fourth LEDs 11a to 11d, and stores the plurality of AD converted light emission amount data in the light emission amount temporary holding unit 34. (First stage). Then, two or more LEDs that repeat light emission and non-light emission at the same timing from the light emission amount measured by the light receiving element 14 when all of the two or more LEDs that repeat light emission and non-light emission at the same timing are in the light emission state. Among them, when only one of the LEDs is in a non-light emitting state, the light emitting amount measured by the light receiving element 14 is subtracted to calculate the light emitting amount of one LED (second stage). Then, the light emission amount of the one LED calculated by the light emission amount comparison unit 35 is stored in the light emission amount holding buffers 32a to 32d. By sequentially applying the first to fourth LEDs 11a to 11d as the "one LED" described above, the light emission amount of each of the first to fourth LEDs 11a to 11d is measured, and the light emission amount data is emitted. The data can be stored in the amount holding buffers 32a to 32d, respectively.

（ロ）Ｓ０５段階に進み、発光回数演算部４１は、発光量保持バッファ３２ａ〜３２ｄに記憶された発光量のデータ及び混色比率記憶部１５に記憶された混色比率のデータに基づいて、第１〜第４のＬＥＤ１１ａ〜１１ｄの各々の１周期における発光回数を演算する（第３の段階）。   (B) Proceeding to step S05, the light emission number calculation unit 41 performs the first based on the light emission amount data stored in the light emission amount holding buffers 32a to 32d and the color mixture ratio data stored in the color mixture ratio storage unit 15. To calculate the number of times of light emission in one period of each of the fourth LEDs 11a to 11d (third stage).

（ハ）Ｓ０７段階において、発光回数管理部２３は、従前の発光回数をＳ０５段階で演算された発光回数へそれぞれ更新し、Ｓ０９段階に進み、ＬＥＤ管理部１３は、１周期内において、更新された発光回数だけ、ＬＥＤ１１ａ〜１１ｄの各々の発光及び非発光を繰返す（第４の段階）。この時、ＬＥＤ管理部１３は、１周期内で繰り返されるＬＥＤ１１ａ〜１１ｄの各々の発光時間及び非発光時間の長さを等しく設定し、更に、ＬＥＤ１１ａ〜１１ｄから任意に選んだ２以上のＬＥＤの発光及び非発光を同じタイミングで繰返す。具体的には、ＬＥＤ１１ａとＬＥＤ１１ｃの発光及び非発光を同じタイミングで繰返し、ＬＥＤ１１ｂとＬＥＤ１１ｄの発光及び非発光を同じタイミングで繰返す。Ｓ０９段階の後、再びＳ０３段階に戻る。   (C) In step S07, the light emission number management unit 23 updates the previous light emission number to the light emission number calculated in step S05, and proceeds to step S09. The LED management unit 13 is updated within one cycle. The light emission and non-light emission of each of the LEDs 11a to 11d are repeated by the number of times of light emission (fourth stage). At this time, the LED management unit 13 sets the lengths of the light emission time and the non-light emission time of each of the LEDs 11a to 11d repeated within one period, and further, two or more LEDs arbitrarily selected from the LEDs 11a to 11d. Light emission and non-light emission are repeated at the same timing. Specifically, light emission and non-light emission of the LED 11a and LED 11c are repeated at the same timing, and light emission and non-light emission of the LED 11b and LED 11d are repeated at the same timing. After step S09, the process returns to step S03 again.

このように、Ｓ０３段階において、発光及び非発光を同じタイミングで繰返す２つ以上のＬＥＤが総て発光状態となった時に受光素子１４により計測された発光量から、発光及び非発光を同じタイミングで繰返す２つ以上のＬＥＤのうち、いずれか１つのＬＥＤのみが非発光状態となった時に受光素子１４により計測された発光量を減算して１つのＬＥＤの発光量を算出する。これにより、各ＬＥＤ１１ａ〜１１ｄの発光量を算出するために、どの測定タイミングにおける発光量の測定値の差分を取ればよいかを容易に判断することができる。   As described above, in step S03, light emission and non-light emission are performed at the same timing from the light emission amount measured by the light receiving element 14 when all of two or more LEDs that repeat light emission and non-light emission at the same timing are in the light emission state. The light emission amount of one LED is calculated by subtracting the light emission amount measured by the light receiving element 14 when only one of the two or more LEDs that repeats is in a non-light emitting state. Thereby, in order to calculate the light emission amount of each LED 11a to 11d, it is possible to easily determine at which measurement timing the difference between the measurement values of the light emission amount should be taken.

次に、図４（ａ）を参照して、図３のＳ０３段階における詳細な処理手順の一例を説明する。   Next, an example of a detailed processing procedure in step S03 of FIG. 3 will be described with reference to FIG.

（い）先ずＳ３１段階において、受光素子１４がＬＥＤ１１ａ〜１１ｄの発光を受けて出力するアナログ信号をＡＤコンバータ３１で発光量のデータ（デジタル信号）へ変換する。Ｓ３３段階に進み、第１のタイマ３３が所定の時間を計数することを待機する。第１のタイマ３３が所定の時間を計数した時（Ｓ３３でＹＥＳ）、Ｓ３５段階に進み、発光量算出部２１は、ＡＤコンバータ３１により変換された発光量のデータを発光量保持バッファ３６或いは発光量保持バッファ３７に書き込む。具体的に、ＬＥＤ１１ａ及びＬＥＤ１１ｃが同時に発光している時に測定した発光量のデータは、発光量保持バッファ３６に書き込み、ＬＥＤ１１ｂ及びＬＥＤ１１ｄが同時に発光している時に測定した発光量のデータは、発光量保持バッファ３７に書き込む。   (I) First, in step S31, the analog signal output by the light receiving element 14 receiving the light emitted from the LEDs 11a to 11d is converted into light emission data (digital signal) by the AD converter 31. The process proceeds to step S33 and waits for the first timer 33 to count a predetermined time. When the first timer 33 counts a predetermined time (YES in S33), the process proceeds to step S35, and the light emission amount calculation unit 21 uses the light emission amount holding buffer 36 or the light emission as the light emission amount data converted by the AD converter 31. Write to the quantity holding buffer 37. Specifically, the light emission amount data measured when the LED 11a and the LED 11c emit light simultaneously is written in the light emission amount holding buffer 36, and the light emission amount data measured when the LED 11b and the LED 11d emit light simultaneously is the light emission amount. Write to the holding buffer 37.

（ろ）Ｓ３７段階に進み、ＬＥＤ管理部１３は、発光及び非発光を同じタイミングで繰返す２つのＬＥＤのうち、いずれか１つのＬＥＤのみが非発光状態となるか否かを監視する。すなわち、同時に点灯するＬＥＤの個数が変化するか否かを監視する。発光及び非発光を同じタイミングで繰返す２つのＬＥＤのうち、いずれか１つのＬＥＤのみが非発光状態となった場合（Ｓ３７段階でＹＥＳ）、Ｓ３９段階に進む。一方、いずれか１つのＬＥＤのみが非発光状態とならない場合（Ｓ３７段階でＮＯ）、Ｓ３１段階に戻る。具体的に、ＬＥＤ管理部１３は、１つのＬＥＤのみが非発光状態となる場合に限り（Ｓ３７段階でＹＥＳ）、発光量算出部２１に対して発光量算出の為のトリガー信号を送信する。当該トリガー信号には、当該１つのＬＥＤの識別情報が含まれている。   (B) Proceeding to step S37, the LED management unit 13 monitors whether only one of the two LEDs that repeats light emission and non-light emission at the same timing is in a non-light emission state. That is, it is monitored whether or not the number of LEDs that are turned on simultaneously changes. If only one of the two LEDs that repeats light emission and non-light emission at the same timing is in a non-light-emitting state (YES in step S37), the process proceeds to step S39. On the other hand, when only one of the LEDs is not in the non-light emitting state (NO in step S37), the process returns to step S31. Specifically, the LED management unit 13 transmits a trigger signal for light emission amount calculation to the light emission amount calculation unit 21 only when only one LED is in a non-light emission state (YES in step S37). The trigger signal includes identification information of the one LED.

（は）Ｓ３９段階において、トリガー信号を受信した発光量比較部３５は、トリガー信号を受信する前、すなわち１つのＬＥＤのみが逆の動作を行う前において発光量保持バッファ３６、３７に記憶された発光量と、トリガー信号を受信した後、すなわち１つのＬＥＤのみが非発光状態となった後において発光量保持バッファ３６、３７に記憶された発光量とを読み出する。そして、１つのＬＥＤのみが非発光状態となる前後における発光量の差分を、当該１つのＬＥＤの発光量として算出し、対応する発光量保持バッファ３２ａ〜３２ｄに格納する。なお、１つのＬＥＤがＬＥＤ１１ａまたは１１ｃである場合、発光量保持バッファ３６から発光量を読み出し、１つのＬＥＤがＬＥＤ１１ｂまたは１１ｄである場合、発光量保持バッファ３７から発光量を読み出す。   In step S39, the light emission amount comparison unit 35 that has received the trigger signal is stored in the light emission amount holding buffers 36 and 37 before receiving the trigger signal, that is, before only one LED performs the reverse operation. The light emission amount and the light emission amount stored in the light emission amount holding buffers 36 and 37 after reading the trigger signal, that is, after only one LED is in the non-light emission state, are read. Then, the difference in the light emission amount before and after only one LED enters the non-light emission state is calculated as the light emission amount of the one LED, and stored in the corresponding light emission amount holding buffers 32a to 32d. When one LED is the LED 11a or 11c, the light emission amount is read from the light emission amount holding buffer 36, and when one LED is the LED 11b or 11d, the light emission amount is read from the light emission amount holding buffer 37.

（に）その後、Ｓ４１段階に進み、発光量保持バッファ３６、３７に記憶されている発光量のデータを消去する。その後、再び、Ｓ３１段階に戻り、ＡＤコンバータ３１の出力を監視する。   (Ii) Thereafter, the process proceeds to step S41, and the light emission amount data stored in the light emission amount holding buffers 36 and 37 are deleted. Thereafter, the process returns to step S31 again, and the output of the AD converter 31 is monitored.

なお、Ｓ４１段階において発光量保持バッファ３６、３７内のデータを消去せずに、１周期内における総てのＬＥＤ１１ａ〜１１ｄの発光回数が終了するまで発光量保持バッファ３６、３７内のデータを保持していてもよい。   In step S41, the data in the light emission amount holding buffers 36 and 37 are not erased, but the data in the light emission amount holding buffers 36 and 37 are held until the number of times of light emission of all the LEDs 11a to 11d in one cycle is completed. You may do it.

このように、ＬＥＤ管理部１３は、発光及び非発光を同じタイミングで繰返す２つのＬＥＤのうち、いずれか１つのＬＥＤのみが非発光状態となるか否かを監視し、当該非発光状態となった場合に限り、発光量比較部３５に対してトリガー信号を送信する。これにより、トリガー信号を受信した発光量比較部３５は、トリガー信号を受信する前に発光量保持バッファ３６、３７に記憶された発光量と、トリガー信号を受信した後に発光量保持バッファ３６、３７に記憶された発光量との差分を、１つのＬＥＤの発光量として算出することができる。   In this manner, the LED management unit 13 monitors whether only one of the two LEDs that repeats light emission and non-light emission at the same timing is in a non-light emission state, and enters the non-light emission state. The trigger signal is transmitted to the light emission amount comparison unit 35 only when Thus, the light emission amount comparison unit 35 that has received the trigger signal, the light emission amount stored in the light emission amount holding buffers 36 and 37 before receiving the trigger signal, and the light emission amount holding buffers 36 and 37 after receiving the trigger signal. The difference from the light emission amount stored in the can be calculated as the light emission amount of one LED.

このトリガー信号を受信する前後における発光量の差分は、発光及び非発光を同じタイミングで繰返す２つ以上のＬＥＤが総て発光状態となった時に受光素子１４により計測された発光量から、発光及び非発光を同じタイミングで繰返す２つ以上のＬＥＤのうち、いずれか１つのＬＥＤのみが非発光状態となった時に受光素子１４により計測された発光量を減算して得られる、１つのＬＥＤの発光量に相当する。よって、各ＬＥＤ１１ａ〜１１ｄの発光量を算出するために、どの測定タイミングにおける発光量の測定値の差分を取ればよいかを容易に判断することができる。   The difference in the amount of light emission before and after receiving this trigger signal is calculated based on the light emission amount measured by the light receiving element 14 when two or more LEDs that repeat light emission and non-light emission at the same timing are all in the light emission state. Light emission of one LED obtained by subtracting the light emission amount measured by the light receiving element 14 when only one of the two or more LEDs that repeat non-light emission at the same timing is in a non-light-emitting state. It corresponds to the amount. Therefore, in order to calculate the light emission amounts of the respective LEDs 11a to 11d, it is possible to easily determine at which measurement timing the difference between the measurement values of the light emission amounts should be taken.

次に、図４（ｂ）を参照して、図３のＳ０５段階における詳細な処理手順の一例を説明する。先ずＳ５１段階において、第２のタイマ２５が所定の時間を計数することを待機する。第２のタイマ２５が所定の時間を計数した時（Ｓ５１でＹＥＳ）、Ｓ５３段階に進み、発光回数演算部４１は、各発光量保持バッファ３２ａ〜３２ｄに記憶されている発光量データを読み出す。そして、Ｓ５５段階に進み、発光回数演算部４１は、読み出した発光量データに基づいて、各ＬＥＤ１１ａ〜１１ｄの発光回数を算出する。算出された各発光回数は、発光回数保持バッファ４２ａ〜４２ｄにそれぞれ記憶される。その後、再び、Ｓ５１段階に戻り、第２のタイマ２５が所定の時間を計数し始める。   Next, an example of a detailed processing procedure in step S05 of FIG. 3 will be described with reference to FIG. First, in step S51, the process waits for the second timer 25 to count a predetermined time. When the second timer 25 counts the predetermined time (YES in S51), the process proceeds to step S53, and the light emission number calculation unit 41 reads the light emission amount data stored in each of the light emission amount holding buffers 32a to 32d. In step S55, the light emission number calculation unit 41 calculates the light emission number of each of the LEDs 11a to 11d based on the read light emission amount data. The calculated number of times of light emission is stored in each of the light emission number holding buffers 42a to 42d. Thereafter, the process returns to step S51 again, and the second timer 25 starts counting a predetermined time.

このようにして、発光回数演算部４１は、第２のタイマ２５が計数する一定の時間間隔をおいて、発光回数の算出を繰返し実施することができる。よって、発光回数保持バッファ４２ａ〜４２ｄには複数の発光回数のデータが記憶され、これらのデータの平均値を用いて発光回数を更新する（Ｓ０７）ことにより、精度よく色度を調整することができる。   In this way, the light emission number calculation unit 41 can repeatedly calculate the light emission number at a certain time interval counted by the second timer 25. Therefore, a plurality of light emission count data is stored in the light emission count holding buffers 42a to 42d, and the chromaticity can be accurately adjusted by updating the light emission count using the average value of these data (S07). it can.

次に、図２（ａ）及び図２（ｂ）を参照して、図３のＳ０９段階における各ＬＥＤ１１ａ〜１１ｄの発光／非発光の制御方法の実施例を説明する。ここで述べる制御方法を適用することにより、各ＬＥＤ１１ａ〜１１ｄの発光量を算出するために、どの測定タイミングにおける発光量の測定値の差分を取ればよいかを容易に判断することができる。なお、図２（ａ）及び図２（ｂ）では、４つのＬＥＤ１１ａ〜１１ｄを、ＬＥＤ１、ＬＥＤ２、ＬＥＤ３及びＬＥＤ４へ任意に置換えて説明する。点状の模様を付した部分が各ＬＥＤ１〜ＬＥＤ４の発光時間を示し、模様を付さない白抜きの部分が各ＬＥＤ１〜ＬＥＤ４の非発光時間を示す。   Next, with reference to FIG. 2A and FIG. 2B, an embodiment of the light emission / non-light emission control method of each LED 11a to 11d in step S09 of FIG. 3 will be described. By applying the control method described here, it is possible to easily determine at which measurement timing the difference between the measurement values of the light emission amounts should be taken in order to calculate the light emission amounts of the respective LEDs 11a to 11d. 2A and 2B, the four LEDs 11a to 11d are arbitrarily replaced with LED1, LED2, LED3, and LED4. A portion with a dotted pattern indicates the light emission time of each LED1 to LED4, and a white portion without a pattern indicates the non-light emission time of each LED1 to LED4.

図２（ａ）に示すように、ＬＥＤ管理部１３は、ＬＥＤ１〜ＬＥＤ４の周期（Ｔ１、Ｔ２）及びその位相を互いに等しく設定する。また、ＬＥＤ１〜ＬＥＤ４の各々の発光及び非発光を、１周期（Ｔ１、Ｔ２）内において複数回繰り返す。更に、１周期（Ｔ１、Ｔ２）内で繰り返されるＬＥＤ１〜ＬＥＤ４の各々の発光時間（単位時間）及び非発光時間の長さを等しく設定する。また更に、ＬＥＤ１とＬＥＤ３の発光及び非発光、ＬＥＤ２とＬＥＤ４の発光及び非発光を、それぞれ同じタイミングで繰返す。   As shown to Fig.2 (a), the LED management part 13 sets the period (T1, T2) of LED1-LED4, and its phase equally. Moreover, light emission and non-light emission of each of LED1 to LED4 are repeated a plurality of times within one period (T1, T2). Furthermore, the length of the light emission time (unit time) and the non-light emission time of each of the LEDs 1 to 4 repeated within one cycle (T1, T2) is set equal. Furthermore, light emission and non-light emission of LED1 and LED3, and light emission and non-light emission of LED2 and LED4 are repeated at the same timing.

発光時間及び非発光時間の長さは等しく設定されているので、ＬＥＤ１とＬＥＤ３が発光している間、ＬＥＤ２とＬＥＤ４は非発光状態となり、ＬＥＤ２とＬＥＤ４が発光している間、ＬＥＤ１とＬＥＤ３は非発光状態となる。   Since the lengths of the light emission time and the non-light emission time are set to be equal, LED2 and LED4 are in a non-light emission state while LED1 and LED3 are emitting light, while LED1 and LED3 are emitting light while LED2 and LED4 are emitting light. It becomes a non-light emitting state.

発光回数制御部１２は、ＬＥＤ１〜ＬＥＤ４の各々について１周期（Ｔ１、Ｔ２）における発光回数、すなわち発光及び非発光の繰返し回数によって、１周期に占める発光時間の割合（オンデューティ比）を制御する。図２（ａ）の例では、ＬＥＤ１の発光回数は６回であり、ＬＥＤ２の発光回数は３回であり、ＬＥＤ３の発光回数は７回であり、ＬＥＤ４の発光回数は１０回である。   The light emission number control unit 12 controls the ratio of light emission time (on-duty ratio) in one cycle according to the number of times of light emission in one cycle (T1, T2), that is, the number of repetitions of light emission and non-light emission, for each of the LED1 to LED4. . In the example of FIG. 2A, the LED1 emits six times, the LED2 emits three times, the LED3 emits seven times, and the LED4 emits ten times.

先ず、１周期（Ｔ１、Ｔ２）の開始と同時に、ＬＥＤ１とＬＥＤ３が発光し始める。その後、ＬＥＤ１とＬＥＤ３の発光が終了すると同時に、ＬＥＤ２とＬＥＤ４が発光し始める。以後、各ＬＥＤ１〜ＬＥＤ４は同じ動作を繰り返す。   First, simultaneously with the start of one cycle (T1, T2), LED1 and LED3 start to emit light. Thereafter, LED2 and LED4 start to emit light simultaneously with the end of light emission of LED1 and LED3. Thereafter, each LED1 to LED4 repeats the same operation.

したがって、図２（ｂ）に示すように、ＬＥＤ１とＬＥＤ３が同時に発光している間に計測された発光量ＰＤ１３と、ＬＥＤ２とＬＥＤ４が同時に発光している間に計測された発光量ＰＤ２４とが、交互に、発光量保持バッファ３６と発光量保持バッファ３７に書き込まれる。なお、発光量ＰＤ３及び発光量ＰＤ４は、それぞれ、ＬＥＤ３及びＬＥＤ４が発光している間に受光素子１４により計測された発光量を示し、同様にして、発光量保持バッファ３６或いは発光量保持バッファ３７にそれぞれ書き込まれる。 Therefore, as shown in FIG. 2B, the light emission amount PD 13 measured while the LED 1 and the LED 3 emit light simultaneously, and the light emission amount PD 24 measured while the LED 2 and the LED 4 emit light simultaneously. Are alternately written in the light emission amount holding buffer 36 and the light emission amount holding buffer 37. The light emission amount PD 3 and the light emission amount PD 4 indicate the light emission amount measured by the light receiving element 14 while the LED 3 and LED 4 emit light, respectively, and similarly, the light emission amount holding buffer 36 or the light emission amount holding. Each is written to the buffer 37.

第１のタイマ３３が計数する一定の時間は、ＬＥＤ１〜４が発光している単位時間よりも十分に短く設定されているので、発光量保持バッファ３６及び発光量保持バッファ３７には、それぞれ複数の発光量ＰＤ１３、ＰＤ２４、ＰＤ３、ＰＤ４のデータが書き込まれる。図２（ｂ）示す各発光量ＰＤ１３、ＰＤ２４、ＰＤ３、ＰＤ４の値は、複数の発光量ＰＤ１３、ＰＤ２４、ＰＤ３、ＰＤ４のデータの平均値をそれぞれ示している。 Since the fixed time counted by the first timer 33 is set to be sufficiently shorter than the unit time during which the LEDs 1 to 4 emit light, each of the light emission amount holding buffer 36 and the light emission amount holding buffer 37 includes a plurality of times. The light emission amounts PD 13 , PD 24 , PD 3 , and PD 4 are written. The value shown in FIG. 2 (b) each of the light-emitting amount shown PD 13, PD 24, PD 3 , PD 4 shows a plurality of light emission amount PD 13, PD 24, PD 3 , PD 4 in the mean value of the data, respectively.

ＬＥＤ１の発光回数（６回）は、ＬＥＤ１と同じタイミングで発光及び非発光を繰返すＬＥＤ３の発光回数（７回）よりも少ない。よって、ＬＥＤ３が７回目の発光状態となる時に、ＬＥＤ１は発光しない、即ち、非発光状態となる。そこで、同じタイミングで発光及び非発光を繰返す２つのＬＥＤ１及びＬＥＤ３のうち、ＬＥＤ１のみが非発光状態となる場合に、発光量比較部３５は、ＬＥＤ１が非発光状態となる前の発光量ＰＤ１３から、ＬＥＤ１が非発光状態となった後の発光量ＰＤ３を減算して、この発光量の差分（ＰＤ１３−ＰＤ３）を非発光状態となったＬＥＤ１の発光量とする。 The number of times of light emission of the LED 1 (6 times) is smaller than the number of times of light emission of the LED 3 (7 times) that repeats light emission and non-light emission at the same timing as the LED 1. Therefore, when the LED 3 enters the seventh light emission state, the LED 1 does not emit light, that is, enters a non-light emission state. Therefore, when only LED 1 is in the non-light emitting state among the two LEDs 1 and LED 3 that repeat light emission and non-light emission at the same timing, the light emission amount comparing unit 35 emits light amount PD 13 before LED 1 enters the non-light emitting state. from, LED1 is subtracted emission amount PD 3 after the non-light emitting state, the emission amount of LED1 became the light emission amount of the difference (PD 13 -PD 3) a non-light-emitting state.

同様に、ＬＥＤ２の発光回数（３回）は、ＬＥＤ２と同じタイミングで発光及び非発光を繰返すＬＥＤ４の発光回数（１０回）よりも少ない。よって、ＬＥＤ４が７〜１０回目の発光状態となる時に、ＬＥＤ２は発光しない、即ち、非発光状態となる。そこで、発光量比較部３５は、同じタイミングで発光及び非発光を繰返す２つのＬＥＤ２及びＬＥＤ４のうち、ＬＥＤ２のみが非発光状態となる場合に、ＬＥＤ２のみが非発光状態となる前の発光量ＰＤ２４から、ＬＥＤ２のみが非発光状態となった後の発光量ＰＤ４を減算して、この発光量の差分（ＰＤ２４−ＰＤ４）を非発光状態となったＬＥＤ２の発光量とする。 Similarly, the number of times of light emission (3 times) of the LED 2 is smaller than the number of times of light emission (10 times) of the LED 4 that repeats light emission and non-light emission at the same timing as the LED 2. Therefore, when the LED 4 enters the seventh to tenth light emission state, the LED 2 does not emit light, that is, enters a non-light emission state. Therefore, the light emission amount comparison unit 35 emits light amount PD before only the LED 2 enters the non-light-emitting state when only the LED 2 is in the non-light-emitting state among the two LEDs 2 and 4 that repeat light emission and non-light emission at the same timing. 24, by subtracting the emission amount PD 4 after only LED2 becomes non-emission state, the light emission amount of LED2 became the light emission amount of the difference (PD 24 -PD 4) a non-light-emitting state.

以上説明したように、本発明の実施の形態によれば、発光及び非発光を同じタイミングで繰返すＬＥＤのうち、いずれか１つのＬＥＤのみが非発光状態となる前後の発光量の差分を、当該１つのＬＥＤの発光量として算出できるため、各ＬＥＤ１１ａ〜１１ｄの発光量を算出するために、どの測定タイミングにおける発光量の測定値の差分を取ればよいかを容易に判断することができる。   As described above, according to the embodiment of the present invention, among the LEDs that repeat light emission and non-light emission at the same timing, the difference in the amount of light emission before and after only one LED enters the non-light emission state is Since it can be calculated as the light emission amount of one LED, in order to calculate the light emission amount of each LED 11a to 11d, it is possible to easily determine at which measurement timing the difference between the measurement values of the light emission amount should be taken.

上記のように、本発明は、１つの実施の形態によって記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施の形態、実施例及び運用技術が明らかとなろう。   As described above, the present invention has been described according to one embodiment. However, it should not be understood that the description and the drawings, which form a part of this disclosure, limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

例えば、発光部１１は異なる色の光をそれぞれ発する複数のＬＥＤ１１ａ〜１１ｄを備えるが、第１〜第４のＬＥＤ１１ａ〜１１ｄの各々が備えるＬＥＤチップの個数や発光箇所の数は、単数で有っても複数であっても構わない。   For example, the light emitting unit 11 includes a plurality of LEDs 11a to 11d that emit light of different colors, but the number of LED chips and the number of light emitting portions included in each of the first to fourth LEDs 11a to 11d are single. Or a plurality of them.

本発明は、液晶ディスプレイ用バックライト装置や、建物の壁面を演出する照明装置など、異なる色の光を合成して所望の色度の光を得る広範な照明装置に対して適用することができる。   INDUSTRIAL APPLICABILITY The present invention can be applied to a wide range of lighting devices that obtain light of desired chromaticity by combining light of different colors, such as a backlight device for a liquid crystal display and a lighting device that produces a wall surface of a building. .

このように、本発明はここでは記載していない様々な実施の形態等を包含するということを理解すべきである。したがって、本発明はこの開示から妥当な特許請求の範囲に係る発明特定事項によってのみ限定されるものである。   Thus, it should be understood that the present invention includes various embodiments and the like not described herein. Therefore, the present invention is limited only by the invention specifying matters according to the scope of claims reasonable from this disclosure.

１１ 発光部
１１ａ 第１のＬＥＤ（第１の発光素子）
１１ｂ 第２のＬＥＤ（第２の発光素子）
１１ｃ 第３のＬＥＤ（第３の発光素子）
１１ｄ 第４のＬＥＤ（第４の発光素子）
１２ 発光回数制御部
１３ ＬＥＤ管理部（オン／オフ制御部）
１４ 受光素子
１５ 混色比率記憶部
２１ 発光量算出部
２２ 発光回数保持部
２３ 発光回数管理部
２４ ＬＥＤ駆動回路
２５ 第２のタイマ
３１ ＡＤコンバータ
３２ａ〜３２ｄ、３６、３７ 発光量保持バッファ
３３ 第１のタイマ
３４ 発光量一時保持部
３５ 発光量比較部
４１ 発光回数演算部
４２ａ〜４２ｄ 発光回数保持バッファ
４５ 基準値入力部
４６ カウンタ
４７ 比較器 11 Light Emitting Unit 11a First LED (First Light Emitting Element)
11b 2nd LED (2nd light emitting element)
11c 3rd LED (3rd light emitting element)
11d 4th LED (4th light emitting element)
12 Light emission count control unit 13 LED management unit (on / off control unit)
DESCRIPTION OF SYMBOLS 14 Light receiving element 15 Color mixing ratio memory | storage part 21 Light emission amount calculation part 22 Light emission frequency holding part 23 Light emission frequency management part 24 LED drive circuit 25 2nd timer 31 AD converter 32a-32d, 36, 37 Light emission amount holding buffer 33 1st Timer 34 Light emission amount temporary holding unit 35 Light emission amount comparing unit 41 Light emission number calculating unit 42a to 42d Light emission number holding buffer 45 Reference value input unit 46 Counter 47 Comparator

Claims (3)

異なる色の光を合成して所望の色度の光を得る照明装置であって、
異なる色の光をそれぞれ発する複数の発光素子と、
前記複数の発光素子による合成光の色度が前記所望の色度になるように、前記発光素子の各々について、１周期における発光回数を制御する発光回数制御部と、
前記１周期内において、前記発光回数制御部により制御された発光回数だけ、前記発光素子の各々の発光及び非発光を繰返すオン／オフ制御部と、
前記複数の発光素子が発する光の発光量を一緒に計測する受光素子と、
前記受光素子により計測された発光量から、前記複数の発光素子のいずれか１つの発光素子の発光量を算出する発光量算出部と、
所望の色度を得るための各色の混色比率データを格納する混色比率記憶部と、を備え、
前記オン／オフ制御部は、前記複数の発光素子のうちの２つ以上の発光素子の発光及び非発光を同じタイミングで繰返し、
前記発光量算出部は、発光及び非発光を同じタイミングで繰返す前記２つ以上の発光素子が総て発光状態となった時に前記受光素子により計測された発光量から、発光及び非発光を同じタイミングで繰返す前記２つ以上の発光素子のうち、いずれか１つの発光素子のみが非発光状態となった時に前記受光素子により計測された発光量を減算して前記１つの発光素子の発光量を算出し、
前記発光回数制御部は、前記１つの発光素子の発光量及び前記混色比率記憶部に記憶された混色比率データに基づいて、前記１つの発光素子の発光回数を制御する
ことを特徴とする照明装置。 A lighting device that combines light of different colors to obtain light of desired chromaticity,
A plurality of light emitting elements each emitting light of different colors;
A light emission number control unit that controls the number of light emission in one cycle for each of the light emitting elements, such that the chromaticity of the combined light by the plurality of light emitting elements becomes the desired chromaticity;
An on / off control unit that repeats light emission and non-light emission of each of the light emitting elements by the number of times of light emission controlled by the light emission number of times control unit within the one cycle;
A light receiving element for measuring together the amount of light emitted by the plurality of light emitting elements;
A light emission amount calculating unit for calculating a light emission amount of any one of the plurality of light emitting elements from a light emission amount measured by the light receiving element;
A color mixture ratio storage unit for storing color mixture ratio data of each color to obtain a desired chromaticity,
The on / off control unit repeats light emission and non-light emission of two or more light emitting elements among the plurality of light emitting elements at the same timing,
The light emission amount calculation unit performs light emission and non-light emission at the same timing from the light emission amount measured by the light receiving element when all of the two or more light emitting elements that repeat light emission and non-light emission at the same timing are in a light emission state. The light emission amount of the one light emitting element is calculated by subtracting the light emission amount measured by the light receiving element when only one of the two or more light emitting elements is repeated in the non-light emitting state. And
The light emission number control unit controls the light emission number of the one light emitting element based on the light emission amount of the one light emitting element and the color mixing ratio data stored in the color mixing ratio storage unit. . 前記オン／オフ制御部は、発光及び非発光を同じタイミングで繰返す前記発光素子のうち、いずれか１つの発光素子のみが逆の動作を行った場合に限り、前記発光量算出部に対してトリガー信号を送信し、
前記発光量算出部は、前記トリガー信号を受信する前に前記受光素子により計測された発光量と、前記トリガー信号を受信した後に前記受光素子により計測された発光量との差分を、前記１つの発光素子の発光量として算出する
ことを特徴とする請求項１に記載の照明装置。 The on / off control unit triggers the light emission amount calculation unit only when only one of the light emitting elements that repeats light emission and non-light emission at the same timing performs the reverse operation. Send a signal,
The light emission amount calculation unit calculates a difference between the light emission amount measured by the light receiving element before receiving the trigger signal and the light emission amount measured by the light receiving element after receiving the trigger signal. The lighting device according to claim 1, wherein the lighting device is calculated as a light emission amount of the light emitting element. 異なる色の光をそれぞれ発する複数の発光素子の発光量を計測する第１の段階と、
計測した発光量から各発光素子の発光量を算出する第２の段階と、
前記異なる色の光を合成して所望の色度を得るための各色の混色比率及び算出された発光量に基づいて、１周期における各発光素子の発光回数を演算する第３の段階と、
前記各発光素子の発光及び非発光を、演算された発光回数だけ繰返す第４の段階とを備える照明装置の調光方法であって、
前記第４の段階において、前記複数の発光素子のうちの２つ以上の発光素子の発光及び非発光を同じタイミングで繰返し、
前記第２の段階において、発光及び非発光を同じタイミングで繰返す前記２つ以上の発光素子が総て発光状態となった時に計測された発光量から、発光及び非発光を同じタイミングで繰返す前記２つ以上の発光素子のうち、いずれか１つの発光素子のみが非発光状態となった時に計測された発光量を減算して前記１つの発光素子の発光量を算出する
ことを特徴とする照明装置の調光方法。 A first step of measuring light emission amounts of a plurality of light emitting elements that respectively emit light of different colors;
A second stage of calculating the light emission amount of each light emitting element from the measured light emission amount;
A third step of calculating the number of times of light emission of each light emitting element in one period based on the color mixture ratio of each color and the calculated light emission amount for combining the light of different colors to obtain a desired chromaticity;
A light control method for an illuminating device comprising: a fourth stage that repeats light emission and non-light emission of each light emitting element by the calculated number of light emission times,
In the fourth stage, light emission and non-light emission of two or more light emitting elements of the plurality of light emitting elements are repeated at the same timing,
In the second stage, the light emission and non-light emission are repeated at the same timing. The light emission and non-light emission are repeated at the same timing from the light emission amount measured when the two or more light emitting elements are all in the light emission state. A lighting device characterized by subtracting a light emission amount measured when only one of the light-emitting elements is in a non-light-emitting state to calculate the light emission amount of the one light-emitting element. Dimming method.
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