Patent · US Active

Acoustic absorber

US11004439B2 · kind B2 · utility

0Cited by

27References

20Claims

0Family size

Assignee

TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC. · US

Inventors

Taehwa Lee · Ann Arbor, US
Hideo Iizuka · Ann Arbor, US

Key dates

Filing date	Feb 26, 2018
Grant date	May 11, 2021
Priority date	—
Expiry date	Sep 6, 2039

Classification

Technology area (CPC G)Physics
CPC primaryG01N2291/044
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

Acoustic measurement systems include an enclosure having a high efficiency yet very thin acoustic absorber coating portions thereof, in order to diminish background reflections. The thin acoustic absorber includes a reflective sublayer having a periodic array of indentations on its surface. The periodic array of indentations can be one-dimensional or two dimensional. The thin acoustic absorber further includes a thin absorbing layer overlaid on the reflective sublayer, and typically formed of a viscoelastic foam. The thin acoustic absorber possesses unprecedented absorption efficiency across a broad frequency range and at normal or oblique angles of incidence.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.