{
  "$type": "site.standard.document",
  "description": "A vibration device includes a light transmissive body, a first cylindrical body, a plate-shaped spring portion, a second cylindrical body, and a vibrating body. The light transmissive body includes a main body portion on an inner side of a portion supported by the first cylindrical body, and a…",
  "path": "/patents/1301276",
  "publishedAt": "2021-09-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G02B27/0006",
    "Murata Manufacturing Co., Ltd."
  ],
  "textContent": "A vibration device includes a light transmissive body, a first cylindrical body, a plate-shaped spring portion, a second cylindrical body, and a vibrating body. The light transmissive body includes a main body portion on an inner side of a portion supported by the first cylindrical body, and a protruding portion extending from the main body portion toward an outer circumference of the light transmissive body and protruding outward more than a portion supported by the first cylindrical body. A ratio between an equivalent mass calculated from a moment of inertia of the protruding portion and a weight of the main body portion is about 0.8 to about 1.2, and a resonant frequency of the light transmissive body is larger than a resonant frequency of the spring portion.",
  "title": "VIBRATION DEVICE AND VIBRATION CONTROL METHOD"
}