Patent ID: 7314284

Claim:
A retroreflective sheeting with triangular pyramidal frustum prism elements, which comprises a reflective element layer containing the triangular pyramidal frustum prism elements in a close-packed state formed on one surface thereof, and satisfies the following requirements: the triangular pyramidal frustum prism element has a bottom surface with one side length thereof being in the range of 50 to 400 μm, and a difference between a longest side and a shortest side thereof being 200 μm or less; the length of a longest edge of the triangular pyramidal frustum prism element is in the range of 30 to 400 μm, and a difference between the longest edge and a shortest edge among the three edges is 100 μm or less; when a vertical line which intersects perpendicularly with the bottom surface is drawn from a top surface of the triangular pyramidal frustum prism element to the bottom surface thereof, the length of a longest vertical line is in the range of 20 to 250 μm; and an angle between adjacent side surfaces of the triangular pyramidal frustum prism element is in the range of 85 to 95 degrees.