| 发明名称 |
Ultrasonic distance measuring apparatus |
| 摘要 |
Undesirable or unpleasant audible sound otherwise generated in a conventional distance measuring apparatus is removed or minimized by controlling the waveform of a burst signal supplied to an ultrasonic transducer so that it has a substantially trapezoidal waveform changing in level with time at rise and/or fall portions thereof.
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| 申请公布号 |
US4578783(A) |
申请公布日期 |
1986.03.25 |
| 申请号 |
US19830488166 |
申请日期 |
1983.04.25 |
| 申请人 |
WEST ELECTRIC CO., LTD. |
发明人 |
IWATA, HIROSHI;MAKINO, HIROSHI |
| 分类号 |
G03B13/36;G01B17/00;G01S7/524;G01S15/10;G02B7/40;G03B3/00;H04N5/232;(IPC1-7):G01S7/66 |
主分类号 |
G03B13/36 |
| 代理机构 |
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代理人 |
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