Polarized light valve
US7236301B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 2004 |
| Grant date | Jun 26, 2007 |
| Priority date | — |
| Expiry date | Jun 23, 2024 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63G31/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A projection system for making an object appear and disappear to an observer on cue. The system remotely activates a reflective axis and a transmissive axis within a polarized window for making an object on cue appear and disappear. In one aspect, this system contains a reflective back plate, a polarized window, and a textured surface. A reflective back plate is placed behind an object. A polarized window is placed in front of the object. A textured surface is placed in front of the polarized window. A polarized light source is placed in front of the textured surface. If the polarized light is aligned parallel to a reflective axis, the textured surface is visible to an observer. If the polarized light is aligned parallel to the transmissive axis, the textured surface and the object are visible to an observer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.