| 摘要 |
PROBLEM TO BE SOLVED: To enable good information communication with a low antenna device by placing a light receiving part and a light emitting part of a plurality of light beacon information receiving (emitting) photoelectric conversion elements toward a predetermined direction and forming them integrally. SOLUTION: A plurality of light beacon information receiving photoelectric conversion elements 1 and a plurality of light beacon information emitting photoelectric conversion elements 2 are placed on a face which is to be an inclined face when an antenna device is installed. Thus when the antenna device is used, light beacon information output from a direction L of a road beacon communication device is input to a light receiving part with an incident angle corrected by the inclination of the face, while light beacon information output from a light emitting part is output in a direction L of the road beacon communication device with an incident angle corrected by the inclination of the face. Thus when the antenna device is placed on a horizontal face such as a dashboard, communication of light beacon information is possible with the road beacon communication device. |
