Illuminator
US7306352B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2005 |
| Grant date | Dec 11, 2007 |
| Priority date | — |
| Expiry date | Dec 24, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An illuminator includes a concave mirror to reflect incident light in a predetermined direction, an inner reflective mirror provided on an optical axis of the concave mirror and having a reflective surface at least one surface thereof, a light source installed on at least one surface of the inner reflective mirror to generate and illuminate light, and a retro-reflective mirror provided at a focal point of the light reflected from the concave mirror, or in a vicinity of the focal point, and having an aperture through which some of the light illuminated from the light source and reflected by the concave mirror passes and a retro-reflective surface to reflect remaining light not passing through the aperture back toward the concave mirror.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.