Patent ID: 11862137
Assignee: KIA CORPORATION
Field: Other consumer goods (Other fields)
Classification: CPC G | IPC G

Claim 0:
1. A vibration reducing device that is attached to a structure and blocks sound transmitted through the structure, the vibration reducing device comprising:
a unit structure having a target frequency band, the unit structure including a plurality of unit cells, each formed of an acoustic meta-material and having a different target frequency, the unit cells being connected through first bridges; and
a predetermined number of unit structures being connected through second bridges and attached to the structure,
wherein each of the unit cells comprises:
a mass portion of which a size is set according to the target frequency;
a base frame formed as a quadrangular frame, the mass portion being eccentrically disposed in the base frame; and
a support portion that connects the mass portion and the base frame, the support portion having a size that is set according to the target frequency,
wherein the support portion is fixed to one side of an upper surface of the base frame through a protruded first fixing portion provided at one end, a connecting portion is integrally extended at a position spaced from the first fixing portion by a certain height, and the support portion is connected to a center of one side of the mass portion through a second fixed portion formed integrally with the connecting portion at an opposite end, and
wherein the support portion has a variable groove in a center portion of the connecting portion, and a length of the support portion is set depending on a size of the variable groove according to the target frequency.