Patent ID: 6444401
Filing Date: 2002-09-03
Classification: H01J

Abstract:
A method of operating a projection exposure apparatus, comprising:placing a first layer of exposure sensitive material on a first layer of material of a device; exposing the first layer of exposure sensitive material using a mask; removing portions of the first layer of material in accordance with the exposure of the first layer of exposure sensitive material; placing a second layer of exposure sensitive material on a second layer of material of the device; exposing the second layer of exposure sensitive material using the mask; removing portions of the second layer of material in accordance with the exposure of the second layer of exposure sensitive material; placing a third layer of exposure sensitive material on a third layer of material of the device; and exposing the third layer of exposure sensitive material using the mask, including forming a field emission device or plurality of field emission devices after exposing the third layer of exposure sensitive material, wherein a tip on the field emission device or plurality of tips on the field emission devices can be obtained with differing sharpness characteristics by varying the depth and diameter of holes in the mask.