Wide-angle collimating optical device
US6563638B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2001 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | May 8, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A collimating optical device utilizes a reflective beamsplitter in the form of a linear polarizing beamsplitter to achieve a wide field of view. One form of the wide-angle collimating optical device includes, in order from an image source, a first absorptive linear polarizer; a first quarter-wave plate; an optical doublet including a piano-concave singlet, a plano-convex singlet whose convex surface has the same curvature as the curvature of the concave surface, and a first reflective beamsplitter joining the concave surface of the plano-concave singlet to the convex surface of the plano-convex singlet; a second quarter-wave plate; and a second reflective beamsplitter. One of the reflective beamsplitters is a linear polarizing beamsplitter, most preferably a wire grid polarizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.