Patent · US Expired

Method and apparatus for creating multiple phase level optical elements

US5262893A · kind A · utility

15Cited by
9References
20Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 4, 1991
Grant dateNov 16, 1993
Priority date—
Expiry dateNov 4, 2011

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG03H2240/42
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

Method and apparatus for creating discrete phase optical elements. An arbitrary phase structure is represented by color encoding to produce a color encoded mask. Thereafter, a photo-sensitive substrate is exposed to broad spectrum light transmitted through or reflected from the mask to create the discrete phase structure in the substrate. In preferred embodiments, the exposed substrate is developed and bleached (if necessary) to remove pigmentation to produce highly efficient multiple level phase structures for optical applications. The color encoded mask is produced by a computer-driven color printer resulting in very fast turnaround times.

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