US 9,814,115 B2
Illumination light communication apparatus and communication module
Shojiro Kido, Osaka (JP); Teruhito Takeda, Hyogo (JP); Hiromichi Goto, Osaka (JP); Kazuo Itoh, Osaka (JP); Hiroyuki Nishino, Osaka (JP); and Shigeaki Yamasaki, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Dec. 22, 2016, as Appl. No. 15/388,217.
Claims priority of application No. 2015-255309 (JP), filed on Dec. 25, 2015; application No. 2015-255442 (JP), filed on Dec. 25, 2015; application No. 2015-257417 (JP), filed on Dec. 28, 2015; application No. 2015-257543 (JP), filed on Dec. 28, 2015; application No. 2016-002047 (JP), filed on Jan. 7, 2016; application No. 2016-002110 (JP), filed on Jan. 7, 2016; application No. 2016-012833 (JP), filed on Jan. 26, 2016; application No. 2016-014749 (JP), filed on Jan. 28, 2016; and application No. 2016-218224 (JP), filed on Nov. 8, 2016.
Prior Publication US 2017/0188420 A1, Jun. 29, 2017
Int. Cl. H04B 10/00 (2013.01); H05B 33/08 (2006.01); H04B 10/50 (2013.01); H04B 10/54 (2013.01); H05B 37/02 (2006.01); H04J 14/00 (2006.01)
CPC H05B 33/089 (2013.01) [H04B 10/502 (2013.01); H04B 10/54 (2013.01); H05B 33/0818 (2013.01); H05B 33/0866 (2013.01); H05B 33/0872 (2013.01); H05B 37/0218 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An illumination light communication apparatus comprising:
a light source which emits illumination light;
a power supply circuit for supplying constant current to the light source;
a switch which is connected in series to the light source, and intermittently interrupts current which flows through the light source;
a signal generating circuit which generates a binary communication signal which controls on and off of the switch to modulate the illumination light; and
a current limiting circuit which is connected in series to the light source and the switch, and limits the current which flows through the light source to prevent the current from exceeding a current set value which is variable.