Tandem lighting panel
US6241358A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 12, 1999 |
| Grant date | Jun 5, 2001 |
| Priority date | — |
| Expiry date | Nov 12, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0071
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A set of light guide blocks B L 1.about.B L 3 provide a tandem arrangement. The light guide block B L 1 is supplied with light from a primary light source L 1. The other primary light sources L 2, L 3 are arranged in recesses formed around distal portions of the light guide blocks B L 1, B L 2, supplying the light guide blocks B L 2, B L 3 with primary light, respectively. Overlap of mutually neighboring light guide blocks gives tang-shaped overlapping portions 17a, 17b, 27a, 27b as well as overlapping bands 17c, 27c, thereby avoiding electrodes at both ends of the primary light sources L 2, L 3 from causing short of brightness. The light guide blocks B L 1.about.B L 3 may be in the form of unified single guide plate. Primary light sources L 1.about.L 3 may have a shape such that electrode sections of both ends are curved. A compact surface light source device with a large emission area is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.