Patent ID: 7034367

Claim:
A semiconductor device comprising: a substrate which has an actual element region including active areas and has a dummy pattern region including dummy patterns, and in which trenches are formed in the actual element region and the dummy pattern region; semiconductor elements provided over the active areas of the substrate; a first embedded insulating film, provided in the trenches within the actual element region, for isolating the semiconductor elements adjacent to each other; and a second embedded insulating film, provided in the trenches within the dummy pattern region, for surrounding the dummy patterns, wherein the widthwise size of each dummy pattern is four times the depth of each trench or less, wherein each dummy pattern has a rectangular shape in plan view, wherein a shorter side of the rectangular shape corresponds to the widthwise size of the dummy pattern, and wherein a longer side of the rectangular shape is greater than the widthwise size of the dummy pattern by three times or more.