Ring lamp for illuminating a delimited volume and the use thereof
US7976175B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 2006 |
| Grant date | Jul 12, 2011 |
| Priority date | — |
| Expiry date | Jun 13, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/0638
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A ring lamp includes a light source having a first hollow cylinder with a lighting device disposed therein. The light source has an emitting surface with a light-emitting direction oriented toward an axis of the hollow cylinder. The lamp also includes a light directing device configured to direct light emission. The light directing device includes a lens system having a lens formed as a second hollow cylinder and configured to focus light into a radial plane which is orthogonal to the axis. The lens system has a ring-shaped aperture diaphragm disposed centrally in an optical path of the light emission behind the lens. The emitting surface of the light source and the lens system have a same length, are coaxial and axially aligned with each other. A radial surface which is defined by an inner radius of the lens system and the length of the lens system spans a delimited volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.