A VARIABLE CONTRAST OPTICAL SPEED SYSTEM
Original Publication Date: 1977-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Xerox Disclosure Journal
The exposure station of an electrophotographic printing machine has original document 22 disposed upon transparent platen 28. The original document is illuminated by light source 30. The light rays reflected from original document 22 are directed by mirror 32 through lens 24 and filter mechanism 26. Filter mechanism 26 interposes a selected color filter into the optical light path. The resultant single color light image is then reflected by mirror 34 onto photoconductive sur-face 12 in superimposed registration with a screen pattern recorded thereon.