Polygon mirror having high reflectance and uniform reflectance over range of incidence angles
US5953147A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1997 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Nov 18, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/09
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser imaging system comprising: a laser for producing a laser beam; and a moving mirror for repetitively reflecting the laser beam over a range of incidence angles to scan the laser beam in a line scan direction; wherein the mirror includes a metallic reflective layer and a multilayer transparent coating on the metallic reflective layer, the multilayer transparent coating including alternating layers of first and second dielectric materials, the thickness of the layers and the composition of the first and second dielectric materials being chosen such that the mirror (a) achieves greater than 90% reflectance over the range of incidence angles, and (b) exhibits minimum reflectance variations over the range of incidence angles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.