发明名称 |
MULTIPLE-GLAZING UNIT SHIELDING AGAINST EXTERNAL EAVES-DROPPING |
摘要 |
<p>An anti-eavesdropping window structure in which the inner and outer panes, separated by a spacer frame have thickness d and D such that D/d is at least equal to 1.5. The space between the panes is filled with a gas mixture having a density in excess of that of air and a body-sound generator applied directly to the outer pane generates thermal noise over a frequency range of 200 to 3000 Hz to superimpose a level of such noise of at least 20 dB on transmitted sound.</p> |
申请公布号 |
GR3000804(T3) |
申请公布日期 |
1991.11.15 |
申请号 |
GR19900400127T |
申请日期 |
1990.04.05 |
申请人 |
FLACHGLAS AKTIENGESELLSCHAFT |
发明人 |
DERNER, PAUL, DR. DIPL.-PHYS.;REICHMANN, PETER, DIPL.-PHYS. |
分类号 |
G10K15/00;E04B1/82;E06B3/67;E06B5/20;G10K11/178;(IPC1-7):E06B5/20;E06B3/66 |
主分类号 |
G10K15/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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