Illumination device
US10197233B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2014 |
| Grant date | Feb 5, 2019 |
| Priority date | — |
| Expiry date | Dec 26, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An illumination device emits illumination light and has a light source arranged inside a housing generating illumination light; a diffusing panel attached to the housing; and a projector inside a space formed by the housing and a part of the diffusing panel and projecting an image onto a projection surface. An optical unit is arranged so that an incident direction of a light flux incident from a display element provided in the projector onto a projection optical system of the projector is substantially parallel to a horizontal plane or in a direction closer to a direction parallel to the horizontal plane than a vertical direction, or in so that an optical axis of the projection optical system on which the light flux from the display element is substantially parallel to the horizontal plane or in a direction closer to a direction parallel to the horizontal plane than the vertical direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.