Patent ID: 7858271

Claim:
A method of measuring dimension of a first pattern with a narrow first width, and a second pattern with a second width wider than the first width of said first pattern and formed in a symmetrical appearance with respect to a center of the second pattern, said second pattern having edges opposed to each other defining the second width, said method comprising: a step of forming a pair of first dummy patterns each having a narrow width, said pair of first dummy patterns being spaced from said edges of said second pattern respectively by a distance approximate to the first width of said first pattern; a first measurement step of measuring, using a dimension measuring device, a spaced distance of one of said first dummy patterns from the edge of said second pattern and a width of said one of said first dummy patterns within the same field of view of said dimension measuring device; a second measurement step of measuring, using said dimension measuring device, a width of said first pattern under the same measurement condition as that of the first measurement step; and a calculation step of calculating a width of said second pattern from W B =2D A +W D +D C , where W B is the calculated width of said second pattern, D C is a design value of a distance between the centers of said pair of first dummy patterns, D A is a measured spaced distance of said one of said first dummy patterns from the edge of said second pattern, and W D is a measured width of said one of said first dummy patterns.