Light communication system and illumination apparatus therefor
First Claim
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1. A light communication system, comprising:
- a communication terminal; and
an illumination apparatus with which light is emitted by an alternating-current power source, whereinsaid 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, andlight 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.
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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.
72 Citations
10 Claims
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1. A light communication system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification