MIRROR SCANNING SYSTEM
Original Publication Date: 1984-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
A novel mirror scanning system 10 is disclosed in Figure 1 that comprises two mirrors 12 and 14 that are fashioned helically about a roller 20. A laser beam brought in from laser source 30 parallel to roller shaft 21 strikes each mirror in turn and reflects off at an angle equal to the angle of incidence. As the roller is rotated, the point of incidence of the laser beam traverses along the face of a mirror such that each mirror produces one scan line at a time. With lens 40 in the system with its focal point at A, the image plane of the resulting spot will be at an angle to the roller. A long focal length lens also has a large region where the spot is in sharp focus, i.e., a considerable depth of focus. Spot intensity can be controlled by modulator 50.