Ring lamp for illuminating a delimited volume and the use thereof
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United States of America Patent
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-
Jul 12, 2011
Grant Date -
Jan 15, 2009
app pub date -
Sep 15, 2006
filing date -
Oct 19, 2005
priority date (Note) -
Expired
status (Latency Note)
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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.
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