| 摘要 |
PROBLEM TO BE SOLVED: To provide a light-receiving unit capable of keeping following a light-emitting unit in visible light communications.SOLUTION: In a visible light communication system having a light-emitting tag 10 which emits visible light including appropriate information, and a digital camera (20) which receives the visible light, acquires information superposed on the received visible light, and executes an operation according to the information thus acquired, the light-emitting tag, serving as a light-emitting unit, comprises: a sensor part 11 including an illuminance sensor 11A operable to acquire an illuminance; a light-emitting part 16 operable to emit visible light based on a predetermined light emission condition; and a CPU 14 operable to change a light emission condition in the sensor part 11 according to an illuminance acquired by the sensor part 11.SELECTED DRAWING: Figure 1 |
