Light-transmitting glass panel
The light-transmitting glass panel 1 is comprised of a pair of glass plates 11 and 12 that are hermetically joined together with one surface of each thereof facing one another, the joining being via a sealing frame 13 that is provided at an outer peripheral portion of the glass plates 11 and 12 and fluidizes at low temperature, and the glass plates 11 and 12 having a hollow layer 14 formed therebetween, and pillars 15 that are substantially cylindrical spacers that are inserted into the hollow layer 14 as atmospheric pressure supporting members and determine the gap between the glass plate 11 and the glass plate 12 . The pillars 15 are arranged in the hollow layer 14 in a matrix shape with a predetermined spacing, and taking the surface residual compressive stress of the glass plates 11 and 12 in MPa to be S, and the thickness of the glass plates 11 and 12 in mm to be d, the average spacing D in mm of the pillars 15 arranged in the hollow layer 14 satisfies the relationship D≦5.2d+5.5+(0.8d+0.08)·√S.
1. A light-transmitting glass panel comprising a pair of glass plates provided separated from one another by a predetermined gap so as to form a hollow layer, and an outer periphery sealing portion that is provided at a peripheral portion of said pair of glass plates and hermetically seals in said hollow layer, characterized in that:
the light-transmitting glass panel has a low-emission layer that is provided on an inner surface of at least one of said pair of glass plates and has an emittance of not more than 0.1, and pillars that are sandwiched between said pair of glass plates in a matrix shape and arranged at a predetermined pitch so as to maintain the predetermined gap; and
said hollow layer has a pressure therein of not more than 10 Pa, and a thickness d in mm of said pair of glass plates, a surface residual compressive stress S in MPa of said pair of glass plates, and the predetermined pitch D of said pillars satisfy D≦f(d,√S).
2. A light-transmitting glass panel as claimed in claim 1 , characterized in that f(d,√S) is defined as f(d,√S)=5.2d+5.5+(0.8d+0.08)·√S.
3. A light-transmitting glass panel as claimed in claim 1 or 2 , characterized in that the thickness d of said pair of glass plates is in a range of 2 to 8 mm, and the surface residual compressive stress S of said pair of glass plates is in a range of 1 to 200 MPa.
4. A light-transmitting glass panel as claimed in claim 3 , characterized in that said pair of glass plates have a Young's modulus in a range of 70 to 75 GPa.
5. A light-transmitting glass panel as claimed in claim 4 , characterized by further having a second glass plate provided separated from one of said pair of glass plates by a second predetermined gap so as to form a second hollow layer, a spacer that is hermetically sandwiched between said one of said pair of glass plates and said second glass plate so as to maintain the second predetermined gap, and a second low-emission layer that is provided on at least one of a second inner surface of said one of said pair of glass plates and an inner surface of said second glass plate and has an emittance of not more than 0.2, wherein said second hollow-layer is filled with a predetermined gas.
6. A light-transmitting glass panel as claimed in claim 5 , characterized in that the predetermined gas is dry air.
7. A light-transmitting glass panel as claimed in claim 5 , characterized in that the predetermined gas is a noble gas.
8. A light-transmitting glass panel as claimed in claim 7 , characterized in that the noble gas is argon.
9. A light-transmitting glass panel as claimed in claim 7 , characterized in that the noble gas is krypton.
10. A light-transmitting glass panel as claimed in claim 3 , characterized by further having a second glass plate provided separated from one of said pair of glass plates by a second predetermined gap so as to form a second hollow layer, a spacer that is hermetically sandwiched between said one of said pair of glass plates and said second glass plate so as to maintain the second predetermined gap, and a second low-emission layer that is provided on at least one of a second inner surface of said one of said pair of glass plates and an inner surface of said second glass plate and has an emittance of not more than 0.2, wherein said second hollow layer is filled with a predetermined gas.
11. A light-transmitting glass panel as claimed in claim 10 , characterized in that the predetermined gas is dry air.
12. A light-transmitting glass panel as claimed in claim 10 , characterized in that the predetermined gas is a noble gas.
13. A light-transmitting glass panel as claimed in claim 12 , characterized in that the noble gas is argon.
14. A light-transmitting glass panel as claimed in claim 12 , characterized in that the noble gas is krypton.
15. A light-transmitting glass panel as claimed in claim 1 or 2 , characterized in that the thickness d of said pair of glass plates is in a range of 2.5 to 6 mm, and the predetermined pitch of said pillars is not less than 15 mm.
16. A light-transmitting glass panel as claimed in claim 15 , characterized in that said pair of glass plates have a Young's modulus in a range of 70 to 75 GPa.
17. A light-transmitting glass panel as claimed in claim 16 , characterized by further having a second glass plate provided separated from one of said pair of glass plates by a second predetermined gap so as to form a second hollow layer, a spacer that is hermetically sandwiched between said one of said pair of glass plates and said second glass plate so as to maintain the second predetermined gap, and a second low-emission layer that is provided on at least one of a second inner surface of said one of said pair of glass plates and an inner surface of said second glass plate and has an emittance of not more than 0.2, wherein said second hollow layer is filled with a predetermined gas.
18. A light-transmitting glass panel as claimed in claim 17 , characterized in that the predetermined gas is dry air.
19. A light-transmitting glass panel as claimed in claim 17 , characterized in that the predetermined gas is a noble gas.
20. A light-transmitting glass panel as claimed in claim 19 , characterized in that the noble gas is argon.
21. A light-transmitting glass panel as claimed in claim 19 , characterized in that the noble gas is krypton.
22. A light-transmitting glass panel as claimed in claim 15 , characterized by further having a second glass plate provided separated from one of said pair of glass plates by a second predetermined gap so as to form a second hollow layer, a spacer that is hermetically sandwiched between said one of said pair of glass plates and said second glass plate so as to maintain the second predetermined gap, and a second low-emission layer that is provided on at least one of a second inner surface of said one of said pair of glass plates and an inner surface of said second glass plate and has an emittance of not more than 0.2, wherein said second hollow layer is filled with a predetermined gas.
23. A light-transmitting glass panel as claimed in claim 22 , characterized in that the predetermined gas is dry air.
24. A light-transmitting glass panel as claimed in claim 22 , characterized in that the predetermined gas is a noble gas.
25. A light-transmitting glass panel as claimed in claim 24 , characterized in that the noble gas is argon.
26. A light-transmitting glass panel as claimed in claim 24 , characterized in that the noble gas is krypton.
27. A light-transmitting glass panel as claimed in claims 1 or 2 , characterized in that said pair of glass plates have a Young's modulus in a range of 70 to 75 GPa.
28. A light-transmitting glass panel as claimed in claim 27 , characterized by further having a second glass plate provided separated from one of said pair of glass plates by a second predetermined gap so as to form a second hollow layer, a spacer that is hermetically sandwiched between said one of said pair of glass plates and said second glass plate so as to maintain the second predetermined gap, and a second low-emission layer that is provided on at least one of a second inner surface of said one of said pair of glass plates and an inner surface of said second glass plate and has an emittance of not more than 0.2, wherein said second hollow layer is filled with a predetermined gas.
29. A light-transmitting glass panel as claimed in claim 28 , characterized in that the predetermined gas is dry air.
30. A light-transmitting glass panel as claimed in claim 28 , characterized in that the predetermined gas is a noble gas.
31. A light-transmitting glass panel as claimed in claim 30 , characterized in that the noble gas is argon.
32. A light-transmitting glass panel as claimed in claim 30 , characterized in that the noble gas is krypton.
33. A light-transmitting glass panel as claimed in claims 1 or 2 , characterized by further having a second glass plate provided separated from one of said pair of glass plates by a second predetermined gap so as to form a second hollow layer, a spacer that is hermetically sandwiched between said one of said pair of glass plates and said second glass plate so as to maintain the second predetermined gap, and a second low-emission layer that is provided on at least one of a second inner surface of said one of said pair of glass plates and an inner surface of said second glass plate and has an emittance of not more than 0.2, wherein said second hollow layer is filled with a predetermined gas.
34. A light-transmitting glass panel as claimed in claim 33 , characterized in that the predetermined gas is dry air.
35. A light-transmitting glass panel as claimed in claim 33 , characterized in that the predetermined gas is a noble gas.
36. A light-transmitting glass panel as claimed in claim 35 , characterized in that the noble gas is argon.
37. A light-transmitting glass panel as claimed in claim 35 , characterized in that the noble gas is krypton.