Light Tunnel Illumination Apparatus
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18
A light tunnel is positioned between a light source and a fiber-optic illuminator to make the output light from the illuminator more uniform in intensity. The remote ends of the optical fibers may be geometrically reconfigured to form any desired illumination field shape. In one embodiment the optical fibers illuminate an array of smaller light tunnels, which make the illumination even more uniform, particularly when the light source is coherent. It is often desirable to make use of a fiber-optic illuminator with a uniform output, regardless of input light intensity non-uniformities. This is conventionally done by intentionally "randomizing" the fiber-optic bundles. The fiber-optic manufacturers have proprietary methods for doing this, but it adds greatly to the cost.