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:
Feb. 07, 2017
Filed:
Nov. 05, 2012
Panasonic Corporation, Osaka, JP;
Shojirou Kido, Osaka, JP;
Eiji Shiohama, Osaka, JP;
Abstract
A lighting fixture for visible light communication is configured to modulate light intensity of a light source () comprising a light-emitting device () to superpose a communication signal on illumination light. The lighting fixture includes: a power supply circuit () configured to control light output of the light source () based on a dimming signal; a switch device (Q) for modulating an output current from the power supply circuit () to the light source (); an impedance element (Rx); a communication circuit (); and an ON circuit (). The communication circuit () is configured to supply a modulation signal to a side of the switch device (Q) to superpose the communication signal on the illumination light. The ON circuit () is configured to turn on the switch device (Q) by supply power from the power supply circuit () when the communication circuit () is inactivated.