Scanning Laser Illumination System
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Scanning spot illumination rather than area illumination is proposed for inspection systems using a linear array light detector in order to increase illumination intensity. Linear arrays are becoming increasingly important as light detectors in optical systems for inspection, print reading, evaluation, etc. These arrays (Fig. 1) see instantaneously only a narrow strip of the object. Depending on the magnification the viewed region may be only a few mils or a few microns wide. Most illumination systems are designed to flood an area with light. Thus, only a small fraction of the total illumination power is used by a linear array. The apparatus described here illuminates only the portion of the object seen by the array and uses the illumination light very efficiently.