KEYWORDS: Light emitting diodes, Control systems, Light sources and illumination, Mirrors, Light sources, Light, Camera shutters, LED lighting, LED displays, Modulation
The system to control the area of illumination is important for the luminaires used for stages and TV studios. Presently the methods to change the distance between a lamp and lenses, or to use a zooming projection of the aperture illuminated by the lamp are used to control the area. However, these methods require many optical components or mechanical components. Moreover, the energy of the light source is partially consumed by the absorption of the shutter on adjusting the illumination area. On the other hand, the control of the illuminance over the illuminated area is not possible by the methods. In this study, we developed the lighting system which enables to control both the illuminated area and the illuminance distribution within the area by scanning the beam from a LED array light source. The area of illumination was expanded along one dimension by scanning the LED beam using a rotating polygon mirror. The selection of the illuminated width and the control of the illuminance distribution were achieved by synchronizing the pulse width modulation (PWM) control of the LED with the rotation of the mirror using a time sharing control. As a result, various illuminance distributions can be realized at real time by using software control for the luminaire. The developed system has the merits of compact and high efficiency.
LEDs have been prevailing rapidly in the field of general lighting owing to the enhancement of output power and
emission efficiency. We developed luminaires for general lighting using color LEDs. We also fabricated the lighting
system for large size holograms by controlling the luminous flux of the arrayed LEDs. Multiple number of high
brightness LEDs with honeycomb arrangement were used as a light source with red, green, and blue LEDs. The
resolution and color of the reconstructed image from the color hologram were characterized quantitatively by using the
luminaire.
Light emitting diode (LED) became popular rapidly by the appearance of blue LED. Three color (R, G, B) emitting
LEDs are utilized for the image display system by the development of multi color emitting LED. White LEDs became to
commercial base by combining blue or UV light sources for excitation and materials for fluorescence. White LEDs are
prevailing for general lighting applications. A single tip with the power of 5W became line up for commercial market
owing to the research for high intensity LEDs. As a result, LEDs are replacing the market of conventional incandescent
lighting and even head lights of the automobile. In this study, we aim to fabricate the white and R, G, B lighting system
using high brightness LEDs for the lighting of holograms instead of a conventional halogen lamp.
The luminaires utilizing high power LED are prevailing for general use. In the application, multiple numbers of LED are
required to attain the desired brightness. It is important to control the light distribution to combine the luminous flux
from each LED. We designed and fabricated the luminaire to control the luminous flux of the LEDs and succeeded to
obtain the designed uniform light distribution with small deviation of chromaticity.
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