Patent · US Active

Subminiature imaging optical system

US7777973B2 · kind B2 · utility

3Cited by
3References
3Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJan 3, 2008
Grant dateAug 17, 2010
Priority date—
Expiry dateJan 19, 2028

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B9/38
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

A subminiature imaging optical system including: first, second, third and fourth lenses sequentially positioned from an object side to an image side, the first lens having positive refractivity, the second lens having a concave image-side surface and having negative refractivity, the third lens having negative refractivity, and the fourth lens having positive refractivity, wherein the second lens satisfies following condition 1, and the third lens satisfies following condition 2,20<V2<50  condition 1,20<V3<50  condition 2,

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.