Patent · US Active

Variable magnification optical system and imaging device

US7388716B2 · kind B2 · utility

2Cited by
4References
19Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 27, 2006
Grant dateJun 17, 2008
Priority date—
Expiry dateJan 26, 2027

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B15/143507
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

A variable magnification optical system for forming an optical image of an object onto a light acceptance surface of an image sensor, has in order from an object side: a first lens group having negative optical power; a second lens group having positive optical power; and a third lens group having positive optical power, the third lens group including at least two lenses. In magnification change from a wide-angle limit to a telephoto limit, the first lens group moves along a locus convex to an image side, the second lens group moves monotonically to the object side, and the third lens group moves along a locus convex to the object side.

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