Lens device and projector having diaphragm mechanisms with apertures having inwardly curved sides
US7114815B2 · kind B2 · utility
3Cited by
13References
11Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jan 12, 2006 |
| Grant date | Oct 3, 2006 |
| Priority date | — |
| Expiry date | Jan 12, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3194
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention provides A lens device of a projector for projecting light that has been modulated and emitted by a display device, wherein said lens device has an optical axis and is arranged telecentric to rays of light emitted from said display device, said lens device has a diaphragm mechanism having an aperture at such a position that the lens device causes principal rays emitted from various locations on the display device to intersect with the optical axis; and said aperture is shaped such that sides of the aperture curve inward approximately along lines that connect areas having substantially similar levels of contrast.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.