IMPROVED ILLUMINATION FOR VISION SYSTEM
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2002-Mar-06
This structure provides external and indirect illu- mination in a spatially restrictive environment. Light is transmitted through a fiber-optic bundle (1) to a uniquely designed quartz lens (2) below the surface of the objective lens (3) and at an angle that inter- sects the surface ofthe die (4). This eliminates spec- ular light from reflecting back into the camera lens. This structure is tolerant of die surfaces (4) with poor contrast, irregular surface textures and other non-uniformity which may cause a wide variety of quality variation from one image to the next.