Lighting unit for inspecting a surface
US6053621A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1997 |
| Grant date | Apr 25, 2000 |
| Priority date | — |
| Expiry date | Dec 23, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0046
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A lighting unit for examining the quality of a product, wherein the lighting unit can be easily assembled, has a small number of components, and emits light from a surface at a light intensity with little unevenness. An illuminant assembly of the lighting unit comprises a ring-shaped transparent body for light diffusion, and a plurality of illuminants such as light-emitting diodes that are positioned along the periphery of the transparent body and are capable of emitting light toward the center of the transparent body. Light emitted from the illuminants passes through the transparent body while being reflected and scattered, and is emitted uniformly from an underside surface of the transparent body, providing emission of light from a surface at an even light intensity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.