| 摘要 |
A discrete pattern, formed by dots discretely arranged in two dimensions, is provided wherein the dots included in a rectangular area having a longitudinal length of Lx and a transverse length of Ly satisfy expression (1),(in expression (1), N denotes the number of dots included in a predetermined area, and D is obtained by expression (2), wherein A(x,y) defines the number of dots, of a total of N dots, included in a rectangular area for which a line segment extended from reference coordinates (0,0) to an arbitrary coordinate point (x,y) is a diagonal line), [Ex. 2]and wherein S1 that is obtained by expression (3) [Ex. 3]is equal to or smaller than 0.7. (In expression (3), g1 is obtained by dividing the average radial distribution function g(r) of each dot in the area by an integration value of g(r) over a range of from r1 to r2, and gav is the average value of g1 within the range of from r1 to r2. When the dots are arranged in a square lattice to satisfy a given filling rate, r1 and r2 are chosen as one and four times the value of the lattice constant Dr respectively. The dot filling rate is a value obtained by multiplying the square of the maximum diameter of a dot by the number of dots, and dividing the product by the size of the area.
|
