Transmitting / receiving system |
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| 申请号 | JP253790 | 申请日 | 1990-01-11 | 公开(公告)号 | JPH03209589A | 公开(公告)日 | 1991-09-12 |
| 申请人 | Hitachi Maxell Ltd; | 发明人 | KATAYAMA YOSUKE; | ||||
| 摘要 | PURPOSE: To reduce the number of magnetic coupling circuit to be used and to eliminate the necessity of an oscillation circuit required for signal transmission and reception only by one of transmitters / receivers by totally transmitting plural signals through one magnetic coupling circuit. CONSTITUTION: At a reader / writer 1, a power supply voltage is impressed from a power supply circuit 3 to respective circuits. An oscillation circuit 5 outputs the carrier of 1MHz frequency for example and supplies the carrier to an amplitude modulation circuit 7. The carrier to be outputted from the amplitude modulation circuit 7 is sent through the magnetic coupling circuit composed of a transmission coil 9 and a reception coil 10 to an IC card 2 and converted to a direct current voltage as the power supply voltage by a rectifying / smoothing circuit 16. This power supply voltage is impressed to the respective circuits in the IC card 2 and power is applied to these circuits and supplied from the reader / writer 1 to the IC card 2. Thus, the number of transmission / reception channels is reduced and circuit constitution for transmission / reception is simplified. COPYRIGHT: (C)1991,JPO&Japio |
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