Glass
AssigneeAGC Inc.
InventorsHirofumi Tokunaga, Kazutaka Ono
Life of this patent
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Abstract
A glass has a density of 2.60 g/cm3 or lower, a Young's modulus of 88 GPa or more, a strain point of 650 to 720° C., a temperature T4 at which a glass viscosity reaches 104 dPa·s of 1,320° C. or lower, a glass surface devitrification temperature (Tc) of T4+20° C. or lower, and an average coefficient of thermal expansion of 30×10−7 to 43×10−7/° C. at 50 to 350° C. The glass contains, as represented by mol % based on oxides, 50 to 80% of SiO2, 8 to 20% of Al2O3, 0 to 0.5% in total of at least one kind of alkali metal oxide selected from the group consisting of Li2O, Na2O and K2O, and 0 to 1% of P2O5.
Claims21
A planar antenna comprising a glass having a density of 2.60 g/cm3 or lower, a Young's modulus of 88 GPa or more, a strain point of 650 to 720° ° C., a temperature T4 at which a glass viscosity reaches 104 dPa·s of 1,320° C. or lower, a glass surface devitrification temperature (Tc) of T4+20ºC or lower, and an average coefficient of thermal expansion of 30×10−7 to 43×10−7/° C. at 50 to 350° C., and
- comprising, as represented by mol % based on oxides,
- 50 to 80% of SiO2,
- 8 to 20% of Al2O3,
- 0 to 5% of B2O3,
- 0 to 15% of MgO,
- 0 to 12% of CaO,
- 0 to 10% of SrO,
- 0 to 10% of BaO,
- 0.005 to 0.2% of Na2O,
- 0.001 to 0.5% of F,
- 0.005 to 0.5% total of alkali metal oxides selected from the group consisting of Li2O, Na2O and K2O, and
- 0 to 1% of P2O5,
- wherein MgO+CaO+SrO+BaO is 18 to 22%.
A planar antenna comprising a glass having a density of 2.60 g/cm3 or lower, a Young's modulus of 88 GPa or more, a strain point of 650 to 720° C., a temperature T4 at which a glass viscosity reaches 104 dPa·s of 1,320° C. or lower, a glass surface devitrification temperature (Tc) of T4+20° C. or lower, and an average coefficient of thermal expansion of 30×10−7 to 43×10−7/° C. at 50 to 350° C., and
- comprising, as represented by mol % based on oxides,
- 50 to 80% of SiO2,
- 8 to 20% of Al2O3,
- 0 to 0.5% in total of at least one kind of alkali metal oxide selected from the group consisting of Li2O, Na2O and K2O, and
- 0 to 1% of P2O5.
Dependencies are inferred from the claim text.