Projection distance adjustable projection display apparatus
US7862184B2 · kind B2 · utility
4Cited by
0References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2008 |
| Grant date | Jan 4, 2011 |
| Priority date | — |
| Expiry date | Mar 27, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A projection display apparatus is provided with a projection distance adjustment mechanism for adjusting a distance between a projection plane and an emitting position of projection light, and provided with a focus adjustment mechanism for making a focus adjustment of a projection image with respect to the projection plane. The focus adjustment mechanism is driven such that a projection image is properly focused onto the projection plane in accordance with the distance between the projection plane and the emitting position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.