Patent ID: 7976175
Filing Date: 2011-07-12
Classification: F21S,G01N

Abstract:
1. A ring lamp comprising: a light source including a first hollow cylinder with a lighting device disposed therein, the light source having an emitting surface with a light-emitting direction oriented toward an axis of the hollow cylinder; a light directing device configured to direct light emission, the light directing device including a lens system including at least one lens having a form of a second hollow cylinder and configured to focus light into a radial plane which is orthogonal to the axis, the lens system including a ring-shaped aperture diaphragm disposed in an optical path of the light emission behind the at least one lens, wherein the emitting surface of the light source and the lens system have a same axial length, are coaxial and axially aligned with each other, and wherein a radial surface defined by an inner radius of the lens system and the length of the lens system span a delimited volume.