Lens shift mechanism and projection image display device
US9122135B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2011 |
| Grant date | Sep 1, 2015 |
| Priority date | — |
| Expiry date | Oct 1, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/147
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A central position detection section has a detection width in which the central position has a median value along one axial direction. When the direction from a position, which is located at the time at which returning is started toward the central position is defined as a go direction, the control section commands that a drive mechanism should sequentially perform following operations: a first operation of driving a projection lens assembly in the go direction; a second operation of allowing the projection lens assembly to travel in a return direction at least by the detection width; and a third operation of allowing the projection lens assembly to travel in the detection width in the go direction by ½ of the detection width traveled in the go direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.