The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 22, 2022
Filed:
Jan. 08, 2020
Ibiden Co., Ltd., Ogaki, JP;
Hideki Furuzawa, Ibi-gun, JP;
Hiroshi Sakaguchi, Ibi-gun, JP;
Tomohiro Nishikawa, Ibi-gun, JP;
Toshihiro Nomura, Ibi-gun, JP;
IBIDEN CO., LTD., Ogaki, JP;
Abstract
A sound-absorbing member has a Helmholtz resonance structure including an inlet passage and a hollow portion connected to the outside through the inlet passage, wherein the sound-absorbing member includes a first layer and a second layer disposed on the first layer, the first layer includes a first main surface and a second main surface opposite to the first main surface, the second layer includes a third main surface facing the second main surface and a fourth main surface opposite to the third main surface, the first layer includes a first through-hole penetrating through the second main surface from the first main surface and defining the inlet passage, the second main surface includes a second main surface opening defining an end portion of the first through-hole and a second main surface flat portion, the third main surface includes a third main surface opening defining an end portion of the hollow portion and a third main surface flat portion, the second main surface opening has an opening area smaller than the opening area of the third main surface opening, and a first air layer is formed at least at a portion between the second main surface flat portion and the third main surface flat portion.