ELECTROCLINIC LIQUID CRYSTAL VARIABLE ATTENUATOR FOR LASER ROS
Original Publication Date: 1992-Dec-31
Included in the Prior Art Database: 2004-Apr-06
Xerox Disclosure Journal
Liquid crystal devices are employed as variable attenuators to control the intensity of a laser used in a Raster Output Scanner. Fast response times are not required, but the device must be controllable in a linear fashion and possess a high transmittance to contrast ratio. The twisted nematic type of liquid crystal device is commonly used as an attenuator wherein its typical response time falls within the range of 10 to 100 milliseconds.