Patent · US Expired

Lens assembly

US6424472B1 · kind B1 · utility

6Cited by
7References
5Claims
0Family size

Inventor

Key dates

Filing dateApr 6, 2001
Grant dateJul 23, 2002
Priority date—
Expiry dateApr 6, 2021

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B7/026
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

A lens assembly including a lens seat and a lens holder. A lens is disposed on the lens seat. Another lens is inlaid in the lens holder. The lens holder is slidably disposed in a receptacle of the lens seat. An electromagnetic coil is disposed around the circumference of the lens seat. The lens holder is made of magnetic conductive material. After the coil is powered on, the coil creates a magnetic force to push and move the lens holder and change the distance between the lenses and thus adjust the focal length of the lens assembly. A resilient member is disposed between the lens holder and the lens seat for resiliently pushing and restoring the lens holder.

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