Patent ID: 7452639
Filing Date: 2008-11-18
Classification: G03F

Abstract:
1. A photomask with photoresist test patterns, comprising: a layout pattern area; and an external pattern area located surrounding the layout pattern area, said external pattern area comprising: first, second, third and fourth alignment pattern areas formed at respective locations of said external pattern area, each of said first, second, third and fourth alignment pattern areas including respective test patterns, wherein said respective test patterns of said first, second, third and fourth alignment pattern areas are distinct each from the other; wherein the test patterns of the first alignment pattern area are arranged by using a center of the first alignment pattern area as a coordinate axis (0, 0), and the points of the test patterns of the first alignment pattern area are picked based on the coordinates (1+4a, 0), (−1−4b, 0), (0, 1+4c), (0, −1−4d), (1+4e, 1+4e), (−1−4f, −1 −4f), (1+4g, −1−4g), and (−1 −4h, 1+4h), and wherein a, b, c, d, e, f, g, and h are natural numbers; wherein the test patterns of the second alignment pattern area are arranged by using a center of the second alignment pattern area as a coordinate axis (0, 0), and the points of the test patterns of the second alignment pattern area are picked based on the coordinates (2+4i, 0), (−2−4j, 0), (0, 2+4k), (0, −2−4l), (2+4m, 2+4m), (−2−4n, −2−4n), (2+4p, −2−4p), and (−2−4q, 2+4q), and wherein i, j, k, l, m, n, p, and q are natural numbers; wherein the test patterns of the third alignment pattern area are arranged by using a center of the third alignment pattern area as a coordinate axis (0, 0), and the points of the test patterns of the third alignment pattern area are picked based on the coordinates (3+4r, 0), (−3−4s, 0), (0, 3+4t), (0, −3−4u), (3+4v, 3+4v), (−3−4w, −3−4w), (3+4z, −3−4z), and (−3−4A, 3+4A), and wherein r, s, t, u, v, w, z and A are natural numbers; and wherein the test patterns of the fourth alignment pattern area are arranged by using a center of the fourth alignment pattern area as a coordinate axis (0, 0), and the points of the test patterns of the fourth alignment pattern area are picked based on the coordinates (4+4B, 0), (−4−4C, 0), (0, 4+4D), (0, −4−4E), (4+4F, 4+4F), (−4−4G, −4−4G), (4+4H,−4−4H), and (−4−4I, 4+4I), and wherein B, C, D, E, F, G, H and I are natural numbers.