Optical signal transmission system |
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| 申请号 | JP5795378 | 申请日 | 1978-05-15 | 公开(公告)号 | JPS54149408A | 公开(公告)日 | 1979-11-22 |
| 申请人 | Mitsubishi Electric Corp; | 发明人 | NAGANO MUNEHIKO; | ||||
| 摘要 | PURPOSE:To obtain a large current gain stably by performing double modulation in the transmission side according to turning-on and off of DC signals and performing double detection in the receiving side and hold a turning-off state at an operation anomaly time. CONSTITUTION:When relay 12 is operated by signals of relay circuit 1, oscillators 10 and 11 are driven, and driving circuit 12 subjects signals of f1 to amplitude modulation by signals of f2, and LED 4 is driven to emit light. Optical signals are transmitted to photo diode 6 through optical fiber 5 and are converted to AC electric signals. Then, after these signals are detected by the first detector circuit 14 and are converted to signals of frequency f2, they are detected by the second detector circuit 16 to operate relay 8 and operate relay circuit 9. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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