{
  "$type": "site.standard.document",
  "description": "A virtual image display device 10 presents a virtual image to a user via a virtual image presentation plate. The virtual image display device 10 includes a display unit 12 that generates an image display light L; a concave mirror 14 that reflects the image display light L and projects the image…",
  "path": "/patents/1421563",
  "publishedAt": "2023-05-17T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60K35/232",
    "JVCKENWOOD CORP [JP]"
  ],
  "textContent": "A virtual image display device 10 presents a virtual image to a user via a virtual image presentation plate. The virtual image display device 10 includes a display unit 12 that generates an image display light L; a concave mirror 14 that reflects the image display light L and projects the image display light L toward the virtual image presentation plate; and a driving mechanism 20 that changes an orientation of the concave mirror 14 to change an incidence angle ϕ of the image display light L on the concave mirror 14 and change a distance a from the concave mirror 14 to the display unit 12 in accordance with the orientation of the concave mirror 14.",
  "title": "VIRTUAL IMAGE DISPLAY DEVICE"
}