Patent ID: 9246521
Filing Date: 2016-01-26
CPC Classification: H03J,H04B

Claim Text:
1. A transmission device comprising: a transmission unit that includes an antenna coil and performs communication with an external device by electromagnetic coupling; a signal output unit that generates a signal of a predetermined frequency and outputs the generated signal to the transmission unit; a communication monitor unit that monitors information about a current flowing through the antenna coil and determines a communication state based on the monitored information; and a communication correction unit that corrects a communication characteristic based on a determination result of the communication state in the communication monitor unit, wherein the communication correction unit is configured to change a Q factor of the transmission unit from a first Q factor to a second Q factor greater than the first Q factor, based on the determination result of the communication state in the communication monitor unit, and wherein the communication monitor unit has a first determination threshold value of the communication state, which is used when the Q factor of the transmission unit is the first Q factor, and a second determination threshold value of the communication state, which is used when the Q factor of the communication unit is the second Q factor, and is configured to switch a threshold value for determining the communication state between the first determination threshold value and the second threshold value, based on the determination result of the communication state.