Glass panel for color cathode ray tube, and cathode ray tube
AssigneeAsahi Glass Company, Limited
InventorsYuichi Kuroki, Tsunehiko Sugawara
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Abstract
A glass panel for a color cathode ray tube, which has a linear absorption coefficient of X-ray with a wavelength of 0.06 nm of from 30 to 38 cm−1 and which has a layer having a compression stress of at least 70 MPa formed by a chemical strengthening method at least at short axis end portions and/or long axis end portions of the outer surface of a face portion and at a center portion of the inner surface of the face portion.
Claims20
A glass panel for a color cathode ray tube comprising at least SiO2, Al2O3, Na2O, K2O, SrO, BaO, ZnO, ZrO2, TiO2, and CeO2, having a linear absorption coefficient of X-ray with a wavelength of 0.06 nm of from 30 to 38 cm−1,
- wherein a layer having a compression stress of at least 70 MPa is present,
- wherein the total content of ZnO and ZrO2 is from 2.5 to 11.0%, and the total content C1 of SrO, BaO and CaO, the content C2 of ZnO and the total content C3 of ZnO and all alkaline earth metal oxides, satisfy relations of
- 0.6≦C1/C3≦0.9, and
- 0.05≦C2/C3≦0.4,
- wherein the panel is formed by a chemical strengthening method and has a compression stress of at least 70 MPa at least at one or both of short axis end portions or long axis end portions of the outer surface of a face portion and at a center portion of the inner surface of the face portion of the panel.
Dependencies are inferred from the claim text.