Heat reflecting glass plate with multilayer coating

A heat reflecting glass plate, comprising a transparent glass plate and a multilayer coating formed on one side of the glass plate, the multilayer coating comprising:

• a base layer which is a film of a protective material selected from the group consisting of indium-tin oxide and AlN deposited on the glass plate surface;
• a heat reflective layer which is a film of a metal selected from the group consisting of Ag and Cu deposited on said base layer and has a thickness in the range from 40 to 200 .ANG.;
• a barrier layer which is a metal Zn film deposited on said heat reflective layer and has a thickness in the range from 20 to 200 .ANG.;
• and
• a protective layer which is a film of said protective material,
• wherein said heat reflective layer is smaller in surface area than the other layers such that only in a peripheral region of the glass plate said barrier layer makes direct contact with said base layer.

A heat reflecting glass plate, comprising a transparent glass plate and a four-layer coating formed on one side of the glass plate, the four-layer coating comprising:

• a base layer which is an AlN film deposited on the glass plate surface;
• a heat reflective layer which is a film of a metal selected from the group consisting of Ag and Cu deposited on said base layer and has a thickness in the range form 40 to 200 .ANG.;
• a barrier layer which is a metal Zn film deposited on said heat reflective layer and has a thickness in the range from 20 to 200 .ANG.;
• and
• a protective layer which is an AlN film deposited on said barrier layer.