| 摘要 |
PROBLEM TO BE SOLVED: To obtain a contamination preventable base board in which, to a base board with a large area, the ratio of oxides having photocatalytic activity and oxides having hydrophilic properties in a base board surface is held to a fixed one while they are separated, and high contamination preventability and this performance can be maintained over a long period. SOLUTION: This production method comprises a stage in which a transparent film having photocatalytic activity is formed on a base board, a stage in which the surface of the transparent film having photocatalytic activity is formed with a transparent film having hydrophilic properties and a stage in which, from the upper parts of both the transparent films formed on the base board, a laser is discontinuously applied to partially remove the transparent film having the hydrophilic properties as the upper layer, and the laser treated parts crystallized by annealing by the laser irradiation on the transparent film having the photocatalytic activity exposed to the lower layer by the removal of the transparent film having the hydrophilic properties are largely scattered all over the surface of the base board.
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