Perforated soundproof structure and method of manufacturing the same
US7434660B2 · kind B2 · utility
8Cited by
19References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 2002 |
| Grant date | Oct 14, 2008 |
| Priority date | — |
| Expiry date | Jan 9, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24322
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A perforated soundproof structure is formed by oppositely arranging an external plate 1 and an internal plate 2 having a number of through-holes 2a. The board thickness, hole diameter and open area ratio of the internal plate 2 are set to satisfy design conditions to give rise to a viscous effect in the air passing through the through-holes 2a, and the design conditions are set so that the frequency bandwidth to attain an absorption coefficient of 0.3 or more is 10% or more of the resonance frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.