| 摘要 |
PROBLEM TO BE SOLVED: To provide a glass bulb for cathode-ray tubes, which can attain lightweight and/or a flat face part through chemical strengthening processing, and can reduce the stresses generated in its sealing part, and moreover to provide a cathode-ray tube which is highly safe using the glass bulb. SOLUTION: This glass bulb for cathode-ray tubes has a panel which has been added with compression stressσc , which is 50 MPa<=|σc|<=250 MPa, to at least either side of a short axis end part or a long axis end part of the outside surface of the face part by the chemical strengthening method, and has the relation t=(tc +tmax )/2 for the average flesh thickness of the face part, which is expressed with a center part flesh thickness tc of the face part and a maximum flesh thickness tmax , and has a flesh thickness tse of the seal edge part of t/tse <=1.4. Furthermore, the glass valve for cathode-ray tubes has the maximum valueσVTmax of tensile stresses generated in the face part by making the inside into a vacuum is 20 MPa<=σVTmax <200 MPa.
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