Patent ID: 7784952

Claim:
An enclosed lens type retroreflective sheet comprising a surface layer including at least one layer, a focusing layer containing glass spheres, and a metal reflective layer on the back side of the focusing layer, wherein the glass spheres are disposed at random locations in the thickness direction of the focusing layer, the glass spheres include a first glass sphere group that provides reflective performance at a small observation angle of 2° or less and up to a large incidence angle of from 5° to less than 90° and a second glass sphere group that provides reflective performance at an observation angle greater than 2° and up to a large incidence angle of from 5° to less than 90° in the same focusing layer, the focusing layer for the second glass sphere group is thinner at the glass spheres than a focus formation position for the glass spheres, the surface layer is present at positions over the first and second glass sphere groups, and the metal reflective layer is formed on the back side of the focusing layer to follow the shape of the glass spheres.