Lighting device with thermally variable reflecting element
US8432500B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 2009 |
| Grant date | Apr 30, 2013 |
| Priority date | — |
| Expiry date | Apr 28, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/855
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention provides a lighting device (100) comprising a light source (10) arranged to generate light source light (11), an optional luminescent material and a thermally variable reflecting element (60). The optional luminescent material (205) is arranged downstream of the light source (10) and is arranged to convert at least part of the light source light (11) into luminescent material light (211). One or more of the light source (10) and the optional luminescent material (205) generate heat when the light source (10) generates light source light (11). The thermally variable reflecting element (60) is arranged downstream of the light source (10) and the optional luminescent material (205). The thermally variable reflecting element (60) has a first state wherein it is substantially reflecting and a second state wherein it is substantially transparent; heat induces a chance from the first state to the second state. The thermally variable reflecting element (60) is arranged to transmit at least part of one or more selected from the group consisting of the light source light (11) and optional luminescent material light (211) when being in the second state. The lighting device (100)…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.