Patent ID: 7695774

Claim:
A production method of a titanium oxide photocatalytic thin film comprising a surface layer including silicon oxide and titanium oxide, the production method comprising the steps of: forming an anatase type titanium oxide thin film on a substrate by a sputtering method, an RF sputtering method, an electron beam deposition method, or an ion plating method; adding the silicon oxide to the anatase type titanium oxide thin film by radiating excimer beam to the anatase type titanium oxide thin film while heating the substrate in the presence of a compound, which includes silicon, selected from the group consisting of quartz, silicone resin, silicone rubber, silicone oil, polysilane, and silane gas, thereby forming the surface layer including the titanium oxide and the silicon oxide, wherein the radiating of the excimer beam to the anatase type titanium oxide thin film is carried out in a vacuum or a gas atmosphere, at least the adding of silicon oxide to the anatase type titanium oxide thin film occurs in an annealing apparatus, and the compound, which includes silicon, is present in a member of the annealing apparatus and is not present in the substrate or any layer directly or indirectly formed on the substrate.