Nippon Sheet Glass Company, Limited

Daisuke Inaoka

Tetsuo Minaai

Yoshifumi Kijima

Masafumi Taguchi

Kazuya Fujino

Provided is a glass panel capable of, even after elapse of a long period, reliably sealing a suction hole and keeping a gap in an airtight state. A suction hole sealing metal materialhas a first protruding portionformed on an atmospheric side around a suction hole, and a second protruding portionformed on a gap side around the suction hole, and as seen in a thickness direction of the glass platesA,B, a first contourwhich is an outermost edge of a first adhesion surface portion Swhere the first protruding portionis in contact with an atmospheric-side surfaceA of the glass plateA, and a second contourwhich is an outermost edge of a second adhesion surface portion Swhere the second protruding portionis in contact with a gap-side surfaceB of the glass plateA, are on an outer side of a third contourwhich is a gap-side hole edge of the suction hole

Glass panel

The reduced pressure double glazed glass panel of the present invention includes an outside glass sheet, an inside glass sheet, and a gap portion that are joined together, with the gap portion being formed between the glass sheets and sealed under reduced pressure. Here, the outside glass sheet has a first glass surface disposed to face the outdoor space and a second glass surface disposed to face the gap portion. A Low-E film is formed on the second glass surface. The following relations hold: (Emissivity of Low-E film &#x2208;)&#x2266;0.067; 31%&#x2266;(Solar reflectance on First glass surface R)&#x2266;40%; (48&#x2212;R)%&#x2266;(Solar absorptance on First glass surface A)&#x2266;17%; (A)&#x2266;{18.3&#x2212;(0.07&#xd7;R)+(20&#xd7;&#x2208;)}%; (Solar heat gain coefficient SHGC)&#x2266;0.50; and (Thermal transmittance U value)&#x2266;1.2 W/m&#xb7;K or less. According to the present invention, it is possible to provide a reduced pressure double glazed glass panel having sufficient heat insulating and heat shielding properties and being less susceptible to bending when exposed to solar radiation.

Growing community of inventors

Tokyo, Japan

Daisuke Inaoka