| 摘要 |
PROBLEM TO BE SOLVED: To obtain a glass top for a copying machine on which a transparent conductive film can be easily formed, by thermally decomposing an org. tin compd. containing no chlorine at a specified temp. to form a tin oxide film on the surface of a glass plate subjected to chemically reinforcement. SOLUTION: This glass top for a copying machine is produced by coating a glass plate with a tin oxide film, and the surface roughness Ra of the tin oxide film is controlled to <3nm. The glass plate is preliminarily chemically reinforced and then a tin oxide film is formed on the surface of the glass, preferably to have <=1MΩ/cm<2> surface resistance and >=88% transmittance. It is preferable to form two or more layers including a preventing film against elusion of alkali and a tin oxide film on the glass surface. An org. tin compd. containing no chlorine as the source material is thermally decomposed near the surface of the glass plate to form the tin oxide film. Concerning, the org. tin compd. containing no chlorine, dibutyl tin diacetate or tetrabutyl tin are preferably used. The temp. near the glass plate is preferably controlled to <=500 deg.C.
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