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:
Aug. 19, 2014
Filed:
Jul. 12, 2012
Masao Kamada, Osaka, JP;
Eiji Shiohama, Osaka, JP;
Hiroyuki Nishino, Osaka, JP;
Minoru Maehara, Osaka, JP;
Yosiaki Hasitani, Osaka, JP;
Yosuke Kondo, Osaka, JP;
Masao Kamada, Osaka, JP;
Eiji Shiohama, Osaka, JP;
Hiroyuki Nishino, Osaka, JP;
Minoru Maehara, Osaka, JP;
Yosiaki Hasitani, Osaka, JP;
Yosuke Kondo, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An illumination light communication device includes a power supply unit controlling a load current in a light source unit to be maintained constant based on a dimming signal; an impedance unit series connected to the light source unit; a switch element parallel connected to the impedance unit to connect/disconnect the impedance unit with the light source unit; and a control unit controlling on/off of the switch element to modulate a light intensity of the light source unit such that a binary communication signal is superimposed on illumination light therefrom. The control unit controls the impedance of the impedance unit such that a difference between magnitudes of the load currents respectively when the pulse of the communication signal is superimposed and is not superimposed is maintained constant regardless of a dimming rate of the dimming signal in a range of a dimming rate equal to or greater than a predetermined level.