Patent ID: 6329104
Filing Date: 2001-12-11
Classification: G03F

Abstract:
A method of aligning a TIR hologram with respect to a substrate to be printed from the TIR hologram, the TIR hologram having a complex high frequency modulation of refractive index formed by holographically recording a pattern into a holographic recording layer, the method comprising the steps:(a) providing alignment marks on the substrate to be printed;(b) providing alignment marks in the holographic recording layer by including alignment marks in a mask and illuminating the alignment marks in the mask so that the light transmitted by the alignment marks in the mask is non-holographically recorded in the holographic recording layer;(c) illuminating the alignment marks in the holographic recording layer and on the substrate to be printed and imaging the light reflected from the alignment marks to form corresponding images that are passed through an optical system onto a detector;(d) comparing the positions of the corresponding images; and(e) adjusting the relative position of one of the substrate to be printed or the TIR hologram in response to the comparison of positions.