Patent ID: 7629040

Claim:
An infrared reflection glass plate which is a glass plate with an infrared reflection film, wherein the infrared reflection film comprises a stacked coating film (X) and a thin film(Y), the stacked coating film (X) has a coating film ( 1 ) made of a high refractive index inorganic material having a refractive index of at least 1.90 and a coating film ( 2 ) made of a low refractive index inorganic material having a refractive index of at most 1.56 wherein, from the glass plate side, beginning with coating film ( 1 ), coating film ( 1 ) and coating film ( 2 ) are alternately stacked, and the total number of coating film ( 1 ) and coating film ( 2 ) in stack (X) is at least 3 coating film ( 1 ) has a geometrical thickness of 70 to 150 nm, and coating film ( 2 ) has a geometrical thickness of 100 to 200 nm the thin film (Y) has a multilayer structure made of an inorganic material on the non-glass plate side of the stacked coating film (X), the thin film (Y) and the coating film of the stacked coating film (X) are in contact with each other, and the thin film (Y) is a multilayer thin film having a high refractive index layer (c) made of a high refractive index inorganic material having a refractive index of at least 1.90 and having a geometrical thickness of from 5 to 40 nm and a low refractive index layer (d) made of a low refractive index inorganic material having a refractive index of at most 1.56 and having a geometrical thickness of from 5 to 40 nm alternately stacked in a totally even number of layers, and the layer in contact with the coating film ( 1 ) of the stacked coating film (X) is the low refractive index layer (d).