Patent ID: 9297642
Filing Date: 2016-03-29
CPC Classification: G01B,G03F

Claim Text:
1. An alignment mark for use in relative position alignment of a mask and a substrate, using a microlens array having a plurality of unit microlens arrays stacked in alternating fashion and constituted by a plurality of microlenses arranged two-dimensionally; polygon field stops arranged at a reverse imaging position between the unit microlens arrays and having polygonal apertures; and aperture stops arranged in at least some of a maximum outspread portion of exposure light between said unit microlens arrays and having apertures of circular shape for determining the numerical aperture of each of the microlenses, the microlens array being arranged between said substrate to be exposed, and said mask being furnished with a pattern for exposure onto the substrate, said alignment mark, which is formed in either said substrate or said mask, comprising a plurality of linear mark segments that extend in directions respectively inclined with respect to all sides of the apertures of said polygon field stops, said linear mark segments consisting of a plurality of first group mark segments extending radially from an alignment center; and a plurality of second group mark segments extending over sides of a polygon shape centered on said alignment center, the positions of said polygon field stops and said mark segments being selected such that some of said mark segments are present inside some of the polygon field stops.