Patent ID: 7479319

Claim:
A glass substrate for a touch panel, the glass substrate formed by cutting at least with laser light radiation, comprising: said glass substrate having a first principal surface and a cut side face substantially perpendicular to said first principal surface, said cut side face at least partially formed by a cutting method including at least cutting with laser light radiation, wherein a surface roughness of the cut side face of said glass substrate is 50 nm or less, and a depth of a first laser mark formed by said laser light radiation on said cut side face is 0.06 mm or more; and the glass substrate includes at least one second side surface at said outermost peripheral edge of said first principal surface, the at least one second side surface is substantially perpendicular to said first principal surface and includes a second laser mark formed thereon, the second laser mark extends from said peripheral edge of said first principal surface along said at least one second side surface for a depth of 0.06 mm or more, wherein said glass substrate has a strength of 55 kgf or more and 90 kgf or less based on a static load test, and said depth of said first laser mark is different from said depth of said second laser mark.