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:
Jun. 10, 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 light source unit including light emitting elements; a power supply unit controlling a load current flowing through the light source unit to be maintained at a constant; a switch element connected in series to the light source unit; and a control unit configured to control on/off of the switch element to modulate a light intensity of illumination light from the light source unit such that a binary communication signal is superimposed on the illumination light. The control unit has a switching circuit to open/close a path between the light source unit and the power supply unit, controls on/off of the switching circuit based on a dimming signal to perform a dimming control on the light source unit by a PWM control, and allows the communication signal to be superimposed on the illumination light in synchronization with an ON time of the switching circuit.