FULLY ENCLOSED AND/OR EVACUATED POLYGON MOTOR ASSEMBLY MOTOR
Original Publication Date: 1988-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Referring to the drawing Figure, the polygon of a raster output scanner rotates at a very high RPM, i.e., 22,000 RP91. At that speed, the polygon acts as a blower impeller creating air currents which cause contamination, air induced inertia, friction losses, and wobble. To prevent this, a quartz or glass window 5 is provided to cover the laser beam opening 6 in the polygon housing 1 to seal the housing and allow the housing to be evacuated.