Variable focus system
US7480099B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 2006 |
| Grant date | Jan 20, 2009 |
| Priority date | — |
| Expiry date | Apr 5, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N13/322
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A variable focus system that includes an electrovariable optic (EVO) and a controller operatively configured for changing the focal configuration of the EVO. The EVO includes a plurality of movable optical elements that may be moved substantially in unison with one another so as to change either the focal length of the EVO, the direction of the focal axis of the EVO, or both, depending upon the needs of a particular application. The variable focus system may be used in conjunction with an image source to construct a 3D floating image projector that projects a series of 2D image slices of a 3D image onto corresponding respective image planes in succession rapidly enough that a 3D floating image is perceived by a viewer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.