Brightness control for fiber optical lamps
AssigneeErnst Leitz Wetzlar GmbH
InventorsWilli Hagner, Horst Frimmel
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Abstract
Disclosed is a brightness control device for use with fiber optical lamps, comprising a diaphragm which is arranged unilaterally in the light beam between the lamp light source and the light entrance area of the fiber optical conductor. The diaphragm comprises a variable size diaphragm which is designed such that the cross-section of the light entrance area of the fiber optical conductor is asymmetrically and unilaterally reduced in order to maintain a constant lamp color temperature and emission characteristic.
Claims5
A brightness control device for use with fiber optical lamps which include an optical fiber bundle having a light entrance area and a light source which directs a light beam towards said light entrance area, comprising a diaphragm arranged unilaterally in the light beam between said light source and said light entrance area, said diaphragm having a variable size and a shape such that the cross-section of the light entrance area of said fiber bundle is asymmetrically and unilaterally reduced.
Dependencies are inferred from the claim text.