Glass panel for a cathode ray tube
AssigneeAsahi Glass Company, Limited
InventorsNaoya Shimizu, Hiroshi Yamasaki
Life of this patent
Estimating the term…
Abstract
A glass panel for a cathode ray tube including a substantially rectangular face portion and a skirt portion. Further constituting a side wall of the face portion, a compressive stress layer having a thickness of at least 1/10 of the thickness of the face portion, is formed on each of the inner and outer surfaces of a useful screen area of the face portion, so as to satisfy 0.4.ltoreq..sigma..sub.di /.sigma..sub.ci .ltoreq.1.0, where .sigma..sub.ci is the compressive stress on the inner surface at the center of the useful screen area, and .sigma..sub.di is the compressive stress on the inner surface in the vicinity of ends of diagonal axial lines of the useful screen area.
Claims13
A glass panel for a cathode ray tube comprising:
- a substantially rectangular face portion;
- and
- a skirt portion forming a side wall of the face portion, wherein inner and outer surfaces of a useful screen area of the face portion include a compressive stress layer having a thickness of at least 1/10 of a thickness of the face portion, and which satisfies a compressive stress ratio:
- 0.4.ltoreq..sigma..sub.di /.sigma..sub.ci .ltoreq.1.0,
- where .sigma..sub.ci is a compressive stress on the inner surface at a center of the useful screen area, and .sigma..sub.di is a compressive stress on the inner surface in a vicinity of ends of diagonal axial lines of the useful screen area.
A glass panel for a cathode ray tube comprising:
- a substantially rectangular face portion;
- and
- a skirt portion forming a side wall of the face portion,
- wherein inner and outer surfaces of a useful screen area of the face portion include a compressive stress layer which satisfies a compressive stress ratio:
- 0.4.ltoreq..sigma..sub.di /.sigma..sub.ci .ltoreq.1.0,
- where .sigma..sub.ci is a compressive stress on the inner surface at a center of the useful screen area, and .sigma..sub.di is a compressive stress on the inner surface in a vicinity of ends of diagonal axial lines of the useful screen area.
A glass panel for a cathode ray tube comprising:
- a substantially rectangular face portion;
- and
- a skirt portion forming a side wall of the face portion,
- wherein inner and outer surfaces of a useful screen area of the face portion include a compressive stress layer having a thickness of at least 1/10 of a thickness of the face portion, and which satisfies the compressive stress ratio:
- 0.4.ltoreq..sigma..sub.di /.sigma..sub.do .ltoreq.1.4,
- where .sigma..sub.di is a compressive stress on the inner surface in a vicinity of ends of diagonal axial lines of the useful screen area, and .sigma..sub.do is a compressive stress on the outer surface in the vicinity of ends of diagonal axial lines of the useful screen area.
Dependencies are inferred from the claim text.