The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 2009
Filed:
Oct. 23, 2003
Masao Nakagawa, Kanagawa, JP;
Toshihiko Komine, Shizuoka, JP;
Shinichiro Haruyama, Kanagawa, JP;
Takaaki Ishigure, Kanagawa, JP;
Yasuhiro Koike, Kanagawa, JP;
Shogo Kitano, Tokyo, JP;
Yasuo Sugawara, Kanagawa, JP;
Masao Nakagawa, Kanagawa, JP;
Toshihiko Komine, Shizuoka, JP;
Shinichiro Haruyama, Kanagawa, JP;
Takaaki Ishigure, Kanagawa, JP;
Yasuhiro Koike, Kanagawa, JP;
Shogo Kitano, Tokyo, JP;
Yasuo Sugawara, Kanagawa, JP;
Nakagawa Laboratories, Inc., Tokyo, JP;
Abstract
The present invention has been developed considering the above-described problems and aims to provide various structures and applications for illuminative light communication. According to the first aspect of the prevent invention, a broadcast system includes an LED light sourcefor lighting, a power linethat supplies electric power to the LED light sourcea data modulatorthat modulates and multiplexes a plurality of pieces of data, superimposes the resulting signal on an electric power waveform, and then transmits the resulting superimposed signal waveform to the power lineand a filterthat selectively separates one or more of a plurality of pieces of modulated data on the power line so as to control light intensity or blinking of the LED light source. Data is transmitted through changes in light intensity or blinking of the LED light source.