发明名称 |
Aerogels, piezoelectric devices, and uses therefor |
摘要 |
In its first aspect the invention provides an electromechanical acoustic transducer (5) which is resistively terminated at the rear with a closely-coupled sound absorber (7) made from an aerogel with good acoustic absorption at low frequencies. The invention also provides an aerogel suitable for this use and which is a conglomerate of small particles packed so that there are spaces left therebetween to allow the passage of sound. Moreover, the invention provides an aerogel suitable for this use and comprised of multiple layers (17a etc.) of materials of graded properties, or comprised of material of continuously varying properties throughout the thickness of the absorbing structure, in the principal direction of sound from the source. |
申请公布号 |
AU8991898(A) |
申请公布日期 |
1999.03.29 |
申请号 |
AU19980089918 |
申请日期 |
1998.09.04 |
申请人 |
1... LIMITED |
发明人 |
ANTHONY HOOLEY;DAVID HENRY PEARCE |
分类号 |
B41J2/045;B06B1/06;B41J2/055;B41J2/16;F16C29/00;F16C29/02;G09F9/00;G10K11/00;G10K11/162;H01F1/44;H01L41/08;H01L41/09;H01L41/333;H02K1/02;H02K7/08;H02K33/16;H02K41/035;H04N13/04;H04R1/02;H04R1/28;H04R17/00 |
主分类号 |
B41J2/045 |
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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