Patent ID: 7749622

Claim:
A multilayer film-coated substrate comprising: a substrate; and a multilayer film laminated on the substrate and comprising a plurality of metal oxide films and a plurality of silicon oxide films, the silicon oxide films and the metal oxide films being alternately laminated and forming at least twenty layers, wherein said plurality of metal oxide films includes at least one metal oxide film layer deposited by sputtering with a target material comprising a metal oxide MO X (where a metal M is at least one metal selected from the group consisting of Ti, Nb, Ta, Mo, W, Zr and Hf, said metal oxide MO X has a stoichiometric composition which is deficient in oxygen, said sputtering is carried out under conditions in which oxygen deficiency is resolved, the multilayer film has a stress of from −100 MPa to +100 MPa, the substrate has a thickness of from 0.05 to 0.4 mm, and the substrate after depositing the multilayer film structure has a bow of from −20 to +20 μm.