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Title:
ILLUMINATION DEVICE
Document Type and Number:
Japanese Patent JP2008181777
Kind Code:
A
Abstract:

To restrain luminance degradation of an illumination light in an illumination device for outputting light with signals for communication superimposed.

The illumination device 1 is provided with a light source 2, a chassis 6 for storing the light source 2, a light control member 4 for transmitting light emitted from the light source 2, a light adjusting controller 5 for changing light transmittance of the light control member 4 by impressing voltage on that 4. Since the light control member 4 is attached only to a part of a light-emitting aperture 60 of the chassis 6, only a part of the illumination light from the light source 2 is used as a signal for communication, so that luminance degradation of the illumination light is restrained at the time of visible light communication and non-communication.


Inventors:
KAWAMINAMI HIROO
NAGASOE KAZUFUMI
Application Number:
JP2007014738A
Publication Date:
August 07, 2008
Filing Date:
January 25, 2007
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC WORKS LTD
International Classes:
F21V33/00; H04B10/11; H04B10/112; H04B10/516; H04B10/524; H04B10/61
Attorney, Agent or Firm:
Yasuo Itaya
Katsumi Taguchi
Shinichi Mizuta