| 摘要 |
THE PRESENT INVENTION IS DIRECTED TO A PROCESS FOR MAKING AN ARRAY OF TAPERED PHOTOPOLYMERIZED WAVEGUIDES. THE TAPERED WAVEGUIDES ARE USEFUL AS A DISPLAY MEANS IN DIRECT VIEW DEVICES AND PROJECTION DISPLAY DEVICES. @IN STEP ( A ), A PHOTOMASK IS PLACED IN SUBSTANTIAL CONTACT WITH A SUBTRATE WHEREIN THE PHOTOMASK HAS OPAQUE AND TRANSPARENT REGIONS. IN STEP ( B ), A SUBSTANTIALLY UNIFORM THICKNESS OF PHOTOPOLYMERIZABLE MIXTURE IS PLACED ON THE SBSTRATE SO THAT THE SUBSTRATE SO THAT THE IS POSITIONED BETWEEN THE PHOTOPOLYMERIZABLE MIXTURE AND THE PHOTOMASK WHEREIN ( I ) THE PHOTOPOLYMERIZABLE MIXTURE COMPRISES AT LEAST ONE REACTIVE MONOMER AND PHOTOINITIATOR AND ( II ) THE PHOTOINITIATOR IS PRESENT IN AN AMOUNT SUFFICIENT TO FORM A SUBSTANTIALLY COLLIMATED ACTINIC RADIATION ACROSS THE THICKNESS OF THE PHOTOPOLYMERIZABLE MIXTURE DURING SUBSEQUENT STEP ( C ). IN STEP ( C ), WHILE MAINTAINING THE PHOTOPOLYMERIZABLE MIXTURE AND SUBSTRATE IN A SUBSTANTIALLY FIXED PLANE RELATIVE TO THE SUBSTANTIALLY COLLIMATED ACTINIC RADIATION, THE PHOTOPOLYMERIZABLE MIXTURE IS EXPOSED THROUGH THE TRANSPARENT REGIONS OF THE PHOTOMASK TO THE SUBSTANTIALLY COLLIMATED ACTINIC RADIATION FOR A TIME SUFFICIENT TO FORM AN ARRAY OF TAPERED PHOTOPOLYMERIZED WAVEGUIDES WHEREIN ( I ) THE TAPERED END OF EACH OF THE WAVEGUIDES EXTENDS OUTWARD FROM THE SUBSTRATE, ( II ) EACH OF THE WAVEGUIDES HAS A LIGHT INPUT SURFACE ADJACENT THE SUBSTRATE AND A LIGHT OUTPUT SURFACE DISTAL FROM THE LIGHT INPUT SURFACE, AND ( III ) THE AREA OF THE LIGHT INPUT SURFACE OF EACH OF THE WAVEGUIDES IS GREATER THAN THE AREA OF ITS LIGHT OUTPUT SURFACE. IN STEP ( D ), THE PHOTOMASK AND PHOTOPOLYMERIZABLE MIXTURE WHICH WAS NOT SUBTANTIALLY POLYMERIZED BY THE SUBSTANTIALLY COLLIMATED ACTINIC RADIATION DURING STEP ( C ) ARE REMOVED FROM THE SUBSTRATE.
|
