What is claimed is:
1. A dielectric composition for use in formation of a dielectric layer in a plasma display panel, comprising a powder material, said powder material comprising powder of glass which is characterized by containing PbO of 50% or less and CuO as one of essential elements contained in said glass.
2. A dielectric composition as claimed in claim 1, wherein the content of CuO is 0.01-20% by weight.
3. A dielectric composition as claimed in claim 2, wherein said glass consists essentially of, by weight, a total amount of 2-30% of BaO, CaO and Bi2O3, 0-35% ZnO, 10-40% B2O3, 1-15% SiO2, 25-50% PbO, and 0.01-20% CuO.
4. A dielectric composition as claimed in claim 2, wherein said glass consists essentially of, by weight, 15-45% BaO, 20-45% ZnO, 12-35% B2O3, 3-15% SiO2, 0-24.5% PbO and 0.01-20% CuO.
5. A dielectric composition as claimed in claim 2, wherein said glass consists essentially of, by weight, 25-45% ZnO, 15-35% Bi2O3, 10-30% B2O3, 0.5-8% SiO2, a total amount of 8-24% of CaO, SrO and BaO, and 0.01-20% CuO.
6. A dielectric composition as claimed in claim 2, wherein said glass consists essentially of, by weight, 26-60% B2O3, 15-50% ZnO, 0-30% SiO2, 0-10% Al2O3, 3-20% K2O, a total amount of 0-10% of Na2O and Li2O, a total amount of 0-15% of CaO and BaO, and 0.01 -20% CuO.
7. A dielectric composition as claimed in claim 1, wherein said glass powder has an average particle size D50 of 3.0 micrometers (m) or less, and the maximum particle size Dmax of 20 micrometers (m) or less.
8. A dielectric composition as claimed in claim 1, further comprising binder, plasticizer, and solvent to form a paste, said paste comprising, by weight, said powder material of 30-90%, said binder of 0.1-20%, said plasticizer of 0-10%, and said solvent of 10-30%.
9. A dielectric composition as claimed in claim 8, wherein said binder is at least one selected from a group of poly butyl methacrylate, polyvinyl butyral, poly methyl methacrylate, poly ethyl methacrylate, and ethyl cellulose, and said plasticizer is at least one selected from a group of butyl benzyl phthalate, dioctyl phthalate, di-isooctyl phthalate, dicapryl phthalate, and dibutyl phthalate.
10. A dielectric composition as claimed in claim 9, wherein said solvent is at least one selected from a group of terpineol, diethylene glycol monobutyl ether acetate, and 2,2,4-trymethyl-1,3-pentanediolmonoisobutylate.
11. A dielectric composition as claimed in claim 1, further comprising binder and plasticizer to form a green sheet, said green sheet comprising, by weight, said powder material of 60-80%, said binder of 5-30%, and said plasticizer of 0-10%.
12. A dielectric composition as claimed in claim 11, wherein said binder is at least one selected from a group of poly butyl methacrylate, polyvinyl butyral, poly methyl methacrylate, poly ethyl methacrylate, and methyl cellulose, and said plasticizer is at least one selected from a group of butyl benzyl phthalate, dioctyl phthalate, di-isooctyl phthalate, dicapryl phthalate, and dibutyl phthalate.
13. A dielectric composition as claimed in claim 1, wherein said powder material further comprising ceramics powder selected from a group of alumina powder, zircon powder, zirconia powder, and titania (titanium oxide), to form a powdery admixture, said powdery admixture comprising said glass powder of 90-100 weight % and said ceramics powder of 0-10 weight %.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A foldable stand for portable handheld electronic device comprising:
a base into an upper surface of which a groove is formed;
a cover pivotably connected to the base for covering the upper surface of the base;
a strut pivotably connected to the cover at an upper edge thereof and slidably mounted in the groove at a lower edge thereof;
wherein the groove is formed in such a manner that it could contain the strut when the cover is closed with respect to the base.
2. The foldable stand according to clam 1, wherein a projection is formed outwards from each side of the strut at the lower edge thereof, while a concave is formed into the base around the groove at the lower part of the groove, in which the length from a tip of one projection to the other is slightly larger than the width of the groove to enable the projections to engage with the concave.
3. The foldable stand according to claim 1, wherein a protrusion is formed upwards from a front edge of the base.
4. The foldable stand according to claim 3, wherein a lump is formed on a surface of the strut facing to the cover, while a corresponding hole is formed in the cover to contain the lump when the stand is in the folded state, in which the size of the lump is slightly larger than that of the hole.
5. The foldable stand according to claim 2, wherein a protrusion is formed upwards from a front edge of the base.
6. The foldable stand according to claim 5, wherein a lump is formed on a surface of the strut facing to the cover, while a corresponding hole is formed in the cover to contain the lump when the stand is in the folded state, in which the size of the lump is slightly larger than that of the hole.
7. The foldable stand according to claim 1, wherein a lump is formed on a surface of the strut facing to the cover, while a corresponding hole is formed in the cover to contain the lump when the stand is in the folded state, in which the size of the lump is slight larger than that of the hole.
8. The foldable stand according to claim 2, wherein a lump is formed on a surface of the strut facing to the cover, while a corresponding hole is formed in the cover to contain the lump when the stand is in the folded state, in which the size of the lump is slight larger than that of the hole.