Ibiden Company Limited

Tomohiro Nishikawa

Motoo Asai

Kazuhito Yamada

Toshihiro Nomura

Hideki Furuzawa

Hiroshi Sakaguchi

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.

Sound absorption member, vehicle component, and automobile

The photoelectric circuit board according to the present invention is a photoelectric circuit board, wherein a rigid portion where at least a conductor circuit and an insulating layer are formed and layered and one or more flex portions that are bendable are integrated, external connection portions for mounting an optical element and/or a package substrate on which an optical element is mounted are formed in above-described rigid portion, and an optical circuit is formed in at least one of above-described flex portions.

Growing community of inventors

Gifu, Japan

Tomohiro Nishikawa