发明名称 |
Transmitter-receiver for non-contact IC card system |
摘要 |
<p>In a non-contact IC card system which transmits and receives signals between an interrogator and a transponder, a transmitter-receiver used for the interrogator comprises a distance detecting means for detecting the distance between the interrogator and the transponder, and an output control means for controlling the output level of the interrogator in accordance with the signals detected by the distance detecting means, so as to keep the receiving level of the transponder within the range of a given value. The receiving level in the transponder can be prevented from varying depending on the distance between the interrogator and the transponder, so that it becomes unnecessary to provide a protective circuit against an excessive increase of the receiving level. The optimum threshold voltage can also be prevented from varying. <IMAGE></p> |
申请公布号 |
EP0722094(A1) |
申请公布日期 |
1996.07.17 |
申请号 |
EP19960100222 |
申请日期 |
1996.01.09 |
申请人 |
SONY CHEMICALS CORP. |
发明人 |
FUJIMOTO, MASAHIRO;ORIHARA, KATSUHISA |
分类号 |
G06K7/00;G06K17/00;G01S13/75;G01S13/82;H04B1/59;(IPC1-7):G01S13/02 |
主分类号 |
G06K7/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|