JP2005011785A - Illumination device - Google Patents

Illumination device Download PDF

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Publication number
JP2005011785A
JP2005011785A JP2003200786A JP2003200786A JP2005011785A JP 2005011785 A JP2005011785 A JP 2005011785A JP 2003200786 A JP2003200786 A JP 2003200786A JP 2003200786 A JP2003200786 A JP 2003200786A JP 2005011785 A JP2005011785 A JP 2005011785A
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JP
Japan
Prior art keywords
color
light emitting
color temperature
white
green
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.)
Pending
Application number
JP2003200786A
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Japanese (ja)
Inventor
Nobuyuki Motokane
信行 元兼
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP2003200786A priority Critical patent/JP2005011785A/en
Publication of JP2005011785A publication Critical patent/JP2005011785A/en
Pending legal-status Critical Current

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Studio Devices (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate variations in color and color temperature of an image generated resulting from variations with the passage of time in light emitting diodes of three colors of red R, green G and blue B. <P>SOLUTION: The color and the color temperature are adjusted by controlling a current by using light emitting diodes of a white color and a yellow color. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、テレビカメラやスチールカメラ等の撮影機材による撮影の際に使用する照明装置に関する。
【0002】
【従来の技術】
従来、ロケーションや報道等の撮影の場合、被写体の色彩・色温度調整のため、人工光源を使用する。撮影用のライトを使用する場合はフィルターを使用し、発光ダイオードを使用する場合は、発光ダイオードのRed赤・Green緑・Biue青を使用し、映像の色彩・色温度の調整を行っている。
【0003】
【発明が解決しようとする課題】
従来の撮影用ライトは、フィルターを使用し、被写体の色彩調整を行っているが、瞬間的に色彩調整が必要な場合において、フィルターの着脱に手間がかかり、映像の色彩に不自然な場合があった。また、発光ダイオードによる撮影用ライトは、発光ダイオードの赤・緑・青の個々に与える電流のコントロールにより、各ダイオードの輝度を調整し、標準的な白色の発光により、被写体の色彩調整を行う。この場合、発光ダイオードの経年的な劣化による、各ダイオードの輝度の変化によって色差が発生することにより、映像の色彩に不自然な状態が発生する。その状態を防止するため、発光ダイオードに与える電流を、その都度、調整する必要が有った。
本発明は、フィルターを使用しないで色彩・色温度を調整し、尚且つ、発光ダイオード赤・緑・青の三色のダイオードを使用せずに、色温度調整を行う発光ダイオード照明装置を、提供することを目的としている。
【0004】
【課題を解決するための手段】
本発明による撮影用ライトは、発光ダイオードの白及び黄色を使用し、電流の制御によって、色彩・色温度の調整を行うものである。
【0005】
【発明の実施の形態】
発明の形態を図面を参照して説明する。
図1に国際照明委員会より引用した等色温度線と黒体軌跡を示す。Aは黒体軌跡、即ち、各色温度の色座標を色度図上にプロットした軌跡であり、標準的な白色の軌跡を表す。又、Bは色差を表す。
赤(R)・緑(G)・青(B)の発光ダイオードを使用した場合の、各色の領域を赤色域・緑色域・青色域で示す。
通常使用する一例として、太陽光・蛍光・タングステン光への調整・切替について示す。
太陽光を略5600K(ケルビン)、蛍光を略4700K、タングステン光を略3000Kとし、各々C点・D点・E点とする。黒体軌跡上のC点・D点E点になるように、R・G・Bのダイオードに与える電流の調整を行い、色温度を設定する。その後、撮影する状況に合わせてC点・D点・E点の切り替えを行い撮影を行う。
【0006】
図2に発光ダイオードが劣化し、輝度が低下した場合の状態を示す。
一例として、緑色の発光ダイオードが劣化し、輝度が低下した場合、色温度及び色差が変化し、黒体軌跡又は近似ラインより大きく外れ、標準的な白色域ではなくなり、色のバランスが崩れ撮影被写体が変色する為、3色のダイオードの電流調整によって、標準的な白色域に戻す必要が有る。
【0007】
図3に白及び黄色の発光ダイオードを使用した場合の、色温度調整の状態の一例を示す。撮影上必要なC点・D点・E点は黒体軌跡に対し、略直線的に近似し、標準的な白色域である。
初期調整は、白色・黄色のダイオードの電流調整により、黒体軌跡の近似値ライン上にC点・D点・E点の設定を行う。又、経年劣化により、どちらかのダイオードの輝度が低下した場合でも、直線上を移動する為、色差が変化する事はない。
従って、白色又は、黄色のどちらかのダイオードに与える電流の調整により、標準的な白色域を確保することが可能となる。
【発明の効果】
本発明は、以上説明したように構成されており、以下に記載されるような効果を奏する。
【0008】
本発明による照明装置は、白色と黄色の2色の発光ダイオードを使用する事により、色差の変化を回避し、ダイオードの経年的な劣化による輝度の低下による色温度の変化を電流の調整により簡単に、適正な色温度域に切り替える効果が有る。
【図面の簡単な説明】
【図1】等色温度線と黒体軌跡上に、R・G・Bの三色のダイオードを使用した場合の標準的な状態を示す。
【図2】等色温度線と黒体軌跡上に、R・G・B・の三色のダイオードの内、G緑のダイオードの輝度が低下した場合の状態を示す。
【図3】等色温度線と黒体軌跡上に、白色と黄色のダイオードを使用した状態を示す。
【符号の説明】
A 黒体軌跡
B 色差
C 太陽光座標
D 蛍光座標
E タングステン光座標
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an illuminating device used when photographing with a photographing device such as a television camera or a still camera.
[0002]
[Prior art]
Conventionally, in the case of shooting a location or news report, an artificial light source is used to adjust the color and color temperature of the subject. When using a light for photographing, a filter is used, and when using a light emitting diode, the red color, green green, and blue of the light emitting diode are used to adjust the color and color temperature of the image.
[0003]
[Problems to be solved by the invention]
Conventional shooting lights use filters to adjust the color of the subject, but when color adjustment is required instantaneously, it may take time to attach and remove the filter, and the colors of the image may be unnatural. there were. In addition, the light for photographing with a light emitting diode adjusts the luminance of each diode by controlling the currents applied to the red, green, and blue of the light emitting diode, and adjusts the color of the subject by standard white light emission. In this case, an unnatural state occurs in the color of an image because a color difference occurs due to a change in luminance of each diode due to deterioration over time of the light emitting diode. In order to prevent this state, it was necessary to adjust the current applied to the light emitting diode each time.
The present invention provides a light-emitting diode illuminating device that adjusts color temperature without using a filter and adjusts color temperature without using light-emitting diode red, green, and blue diodes. The purpose is to do.
[0004]
[Means for Solving the Problems]
The photographing light according to the present invention uses white and yellow light emitting diodes, and adjusts the color and color temperature by controlling the current.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the invention will be described with reference to the drawings.
Fig. 1 shows the isochromatic temperature line and black body locus quoted by the International Commission on Illumination. A is a black body locus, that is, a locus in which the color coordinates of each color temperature are plotted on a chromaticity diagram, and represents a standard white locus. B represents the color difference.
When red (R), green (G), and blue (B) light emitting diodes are used, regions of each color are shown as a red region, a green region, and a blue region.
As an example of normal use, adjustment / switching to sunlight, fluorescence, and tungsten light will be described.
Sunlight is approximately 5600K (Kelvin), fluorescence is approximately 4700K, tungsten light is approximately 3000K, and points C, D, and E, respectively. The color temperature is set by adjusting the current applied to the R, G, and B diodes so that the C point, the D point, and the E point on the black body locus. Thereafter, shooting is performed by switching between the C point, the D point, and the E point according to the shooting situation.
[0006]
FIG. 2 shows a state where the light emitting diode is deteriorated and the luminance is lowered.
As an example, when the green light emitting diode deteriorates and the brightness decreases, the color temperature and color difference change, deviate greatly from the black body locus or approximate line, disappear from the standard white area, and the color balance is lost and the subject is photographed. Therefore, it is necessary to return to the standard white region by adjusting the current of the diodes of the three colors.
[0007]
FIG. 3 shows an example of the state of color temperature adjustment when white and yellow light emitting diodes are used. The points C, D, and E necessary for photographing are approximated in a substantially straight line with respect to the black body locus and are standard white areas.
In the initial adjustment, the points C, D, and E are set on the approximate value line of the black body locus by adjusting the currents of the white and yellow diodes. Even when the luminance of one of the diodes decreases due to deterioration over time, the color difference does not change because it moves on a straight line.
Therefore, it is possible to ensure a standard white region by adjusting the current applied to either the white or yellow diode.
【The invention's effect】
The present invention is configured as described above, and has the following effects.
[0008]
The lighting device according to the present invention avoids a change in color difference by using light emitting diodes of two colors, white and yellow, and easily adjusts the color temperature due to a decrease in luminance due to aged deterioration of the diode by adjusting the current. In addition, there is an effect of switching to an appropriate color temperature range.
[Brief description of the drawings]
FIG. 1 shows a standard state when diodes of three colors of R, G, and B are used on a color matching temperature line and a black body locus.
FIG. 2 shows a state where the luminance of a green diode of R, G, B, and three colors is lowered on a color matching temperature line and a black body locus.
FIG. 3 shows a state in which white and yellow diodes are used on a color matching temperature line and a black body locus.
[Explanation of symbols]
A Blackbody locus B Color difference C Sunlight coordinates D Fluorescence coordinates E Tungsten light coordinates

Claims (1)

白及び黄色の発光ダイオードを使用し、電流の制御によって、色温度を調整する照明装置。A lighting device that uses white and yellow light emitting diodes and adjusts the color temperature by controlling the current.
JP2003200786A 2003-06-18 2003-06-18 Illumination device Pending JP2005011785A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003200786A JP2005011785A (en) 2003-06-18 2003-06-18 Illumination device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003200786A JP2005011785A (en) 2003-06-18 2003-06-18 Illumination device

Publications (1)

Publication Number Publication Date
JP2005011785A true JP2005011785A (en) 2005-01-13

Family

ID=34100456

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003200786A Pending JP2005011785A (en) 2003-06-18 2003-06-18 Illumination device

Country Status (1)

Country Link
JP (1) JP2005011785A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009543281A (en) * 2006-06-27 2009-12-03 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Color navigation system
JP2010049987A (en) * 2008-08-22 2010-03-04 Rohm Co Ltd Manufacturing system using photoresist, and its lighting source
JP2012009639A (en) * 2010-06-25 2012-01-12 Panasonic Electric Works Co Ltd Light-emitting device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009543281A (en) * 2006-06-27 2009-12-03 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Color navigation system
JP2010049987A (en) * 2008-08-22 2010-03-04 Rohm Co Ltd Manufacturing system using photoresist, and its lighting source
JP2012009639A (en) * 2010-06-25 2012-01-12 Panasonic Electric Works Co Ltd Light-emitting device

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