Patent ID: 7399721

Claim:
A glass for laser processing that can be laser-processed by causing ablation or evaporation by laser beam energy absorbed therein, wherein the glass for laser processing has a composition that comprises at least one selected from the group consisting of SiO 2 and B 2 O 3 as a network forming oxide, at least one selected from the group consisting of Al 2 O 3 and TiO 2 as a intermediate oxide, and at least one selected from the group consisting of Li 2 O, Na 2 O, K 2 O, Rb 2 O, Cs 2 O, MgO, CaO, SrO and BaO as a modifier oxide, satisfies the following conditions: 60≦SiO 2 +B 2 O 3 ≦79 mol %; 10≦Al 2 O 3 +TiO 2 ≦20 mol %; and 5≦Li 2 O+Na 2 O+K 2 O+Rb 2 O+Cs 2 O+MgO+CaO+SrO+BaO≦20 mol %, where 10≦TiO 2 ≦20 mol % and 10 mol %≦Na 2 O, the composition is substantially uniform in a direction of thickness of the glass, and the glass for laser processing has processing threshold values of 60 mW or lower at a wavelength of 266 nm and 500 mW or lower at a wavelength of 355 nm, where the processing threshold values denote energy used at the limit of causing ablation.