Patent ID: 7217448

Claim:
A glass structure comprising: a glass substrate having substantially parallel surfaces wherein said glass substrate uniformly contains, imported into said glass substrate, at least one kind of element capable of absorbing energy of a laser beam so that good processability is obtained even in the inside of the glass, wherein said element is at least one member selected from the group consisting of titanium, iron, vanadium, bismuth, lead, thallium, tin, cerium, rhodium, and cobalt; and a hole formed in said glass substrate so as to pierce said glass substrate in a thickness direction of said glass substrate; wherein a limited portion of a surface of said glass substrate is removed by ablation or vaporization by energy of said laser beam which is changed intermittently or continuously, whereby a sectional shape and/or dimension of said hole defined in parallel to surfaces of said glass substrate is controllably varied between one surface and another surface of said parallel surfaces of said glass substrate.