Patent ID: 7279792

Claim:
A semiconductor device which has a first surface on which an external connection electrode is formed and a second surface which opposes the first surface and is in a mirror surface state, the device comprising: a first roughened region obtained by roughening a first part of the second surface by providing a first plurality of craters each including a first recessed portion and a first projecting portion around the first recessed portion by laser marking and forming one or more marks included in characters that include product information of a semiconductor device, the first plurality of craters being provided so that the distance along the second surface between adjacent first craters is no more than a maximum width of the first craters along the second surface, a second roughened region obtained by roughening a second part of the second surface by providing a second plurality of craters each including a second recessed portion and a second projecting portion around the second recessed portion by laser marking, the second plurality of craters being provided so that the distance along the second surface between adjacent second craters is no more than a maximum width of the second craters along the second surface, wherein the second roughened region has an adjusting function for adjusting a difference in light reflectance on the second surface by adjusting the number, size, shape and layout position of the second craters when the second surface is irradiated with light.