{
  "$type": "site.standard.document",
  "description": "An optical system consists of a front lens unit having a positive or negative refractive power, a diaphragm, and a rear lens unit having a positive refractive power, which are arranged in this order from an object side to an image side. The front lens unit includes an aspherical lens that has a…",
  "path": "/patents/1301272",
  "publishedAt": "2021-09-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G02B13/002",
    "CANON KABUSHIKI KAISHA"
  ],
  "textContent": "An optical system consists of a front lens unit having a positive or negative refractive power, a diaphragm, and a rear lens unit having a positive refractive power, which are arranged in this order from an object side to an image side. The front lens unit includes an aspherical lens that has a positive refractive power on an optical axis, and is disposed closest to an object. The aspherical lens has an aspherical surface on the object side in which an off-axis radius of curvature is larger than an on-axis radius of curvature. A predetermined condition is satisfied.",
  "title": "OPTICAL SYSTEM, IMAGE PICKUP APPARATUS, IN-VEHICLE SYSTEM, AND MOVING APPARATUS"
}