Method for manufacturing glass substrate with layered film

A method for manufacturing a laminated film-coated glass plate, the method comprising:

• melting a raw material for a glass to obtain a molten glass;
• floating the molten glass on a molten metal to form a glass ribbon;
• annealing the glass ribbon in an annealing furnace;
• depositing a laminated film on an upper surface of the glass ribbon by a CVD method using injectors disposed in the annealing furnace;
• and
• cutting the glass ribbon to obtain the film-coated glass plate, wherein:
• a temperature of the upper surface of the glass ribbon while the laminated film is deposited thereon is Tg+50° C. or lower, wherein Tg is a glass transition temperature of the glass;
• and
• a facing surface of each injector which faces the glass ribbon has an area S (m2) represented by the following expression:
• S≦(0.0116×P×Cg×T)/{ε×F×σ(Tgla4−Tinj4)},
• wherein P is an output speed (ton/day) of the glass ribbon;
• Cg is a specific heat (J/(kg·° C.)) of the glass;
• T is an acceptable temperature drop by which the glass ribbon is cooled during conveyance from an inlet to an outlet in one injector, which is less than or equal to 10° C.;
• ε is a radiation factor;
• F is a view factor in radiative heat transfer between the facing surface of the injector and the glass ribbon;
• σ is Boltzmann's constant (5.67×10−8 (W/m2·K4));
• Tgla is a temperature (K) of the glass ribbon represented by Tgla=(Tin+Tout)/2, wherein Tin is a temperature (K) of the glass ribbon at a beginning of a deposition by the injector measured by a Type K thermocouple, and Tout is a temperature of the glass ribbon at an end of the deposition by the injector measured by a Type K thermocouple;
• and Tinj is a temperature (K) of the facing surface of the injector.