| 发明名称 |
Intrinsically safe matrix keypad having opto-couplers associated with each row and column of switches |
| 摘要 |
A matrix keypad is rendered intrinsically safe by use of a circuit employing a plurality of opto-couplers powered by a single intrinsically safe (IS) barrier.
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| 申请公布号 |
US4777375(A) |
申请公布日期 |
1988.10.11 |
| 申请号 |
US19870079660 |
申请日期 |
1987.07.29 |
| 申请人 |
TELECO OILFIELD SERVICES INC. |
发明人 |
BOZZUTO, JR., RICHARD C. |
| 分类号 |
H02H9/00;H03K17/795;(IPC1-7):G02B27/00 |
主分类号 |
H02H9/00 |
| 代理机构 |
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代理人 |
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| 地址 |
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