{
  "$type": "site.standard.document",
  "description": "To enable an output sound of a speaker unit to be output as a surface sound source in a limited space. A three-dimensional knitted fabric 43 is provided at a position substantially facing speaker units 31, 32 while being given tension in a surface direction. Since the tension is applied, a pair of…",
  "path": "/patents/937680",
  "publishedAt": "2016-09-21T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60N2/809",
    "DELTA TOOLING CO LTD [JP]"
  ],
  "textContent": "To enable an output sound of a speaker unit to be output as a surface sound source in a limited space. A three-dimensional knitted fabric 43 is provided at a position substantially facing speaker units 31, 32 while being given tension in a surface direction. Since the tension is applied, a pair of ground knitted fabrics constituting the three-dimensional knitted fabric 43 and a connecting yarn extending back and forth between the ground knitted fabrics vibrate due to their elastic action. In particular, string vibration is generated in the connecting yarn. Due to this vibration, output sounds of the speaker units 31, 32 are propagated in the surface direction of the three-dimensional knitted fabric, and as a result, the three-dimensional knitted fabric propagates and radiates acoustic waves of a surface sound source.",
  "title": "ACOUSTIC DEVICE AND HEADREST"
}