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US 7,548,698 B2Granted
Light communication system and illumination apparatus therefor
AssigneeAvago Technologies ECBU IP (Singapore) Pte. Ltd.
InventorKenji Yamamoto
Life of this patent
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Abstract
An illumination apparatus is used in the light communication system. The apparatus receives electricity from a commercial alternating-current power source and a light-emitting element in the apparatus emits light. The zero passage time of commercial alternating-current power source is detected and signals are transmitted from illumination apparatus, or intercommunications between terminals of communication equipment take place, during a specific reserved time that is in synchronization with this zero passage time.
Claims10
A light communication system, comprising:
- a communication terminal;
- and
- an illumination apparatus with which light is emitted by an alternating-current power source, wherein
- said illumination apparatus provides reserved time available exclusively for light communication signal transmission of a specific period that is in synchronization with the zero passage time of the voltage of the alternating-current power source, and
- light emission of the illumination apparatus is turned off during this reserved time, and said communication terminal communicates signals in accordance with a light communication signal transmission time and a light communication signal reception time in accordance with the reserved time of the illumination apparatus, the signals comprising modulated waves, wherein the length of the reserved time of said illumination apparatus can be varied, and said light communication signal transmission time and said light communication signal reception time can be changed in accordance with the reserved time setting of said illumination apparatus.
2 more elements
Dependencies are inferred from the claim text.