Illuminating apparatus, projection lens, and display apparatus including the illumination apparatus and the projection lens
US5719706A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1996 |
| Grant date | Feb 17, 1998 |
| Priority date | — |
| Expiry date | Mar 12, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7441
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An illumination apparatus includes a light source for emitting light including three primary color components; a condensing device for condensing light emitted by the light source; a luminous surface formation device for converging the light from the condensing device and dividing the converged light into color light rays respectively of the three primary colors to form color luminous surfaces respectively of the three primary colors; relay lenses respectively provided in the vicinity of the color luminous surfaces to receive the color light rays from the luminous surface formation device; a field lens for receiving the color light rays from the relay lenses; a first microlens array for receiving the color light rays from the field lens; and a second microlens array for receiving the color light rays from the first microlens array. The first microlens array includes a plurality of first microlenses arranged two-dimensionally. The second microlens array includes a plurality of second microlenses two-dimensionally in the same quantity as the first microlenses in correspondence therewith. The first microlenses array arranges actual images of the color luminous surfaces two-dimensional…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.