Cathode-ray tube
AssigneeOwens-Illinois, Inc.
InventorBernard L. Steierman
Life of this patent
Estimating the term…
Abstract
A cathode-ray tube, such as a color television tube, formed from a glass containing up to 20 percent by weight of strontium oxide as an essential ingredient thereof, which tube has imparted thereto improved X-ray absorbing properties without any material increase in the X-ray and electron browning of the glass.
Claims9
A cathode-ray tube comprising a glass funnel portion, a glass faceplate sealed thereto, a fluorescent screen on the inner surface of said faceplate, and an electron gun disposed within said sealed tube, said tube having the property of absorbing X-rays emitted from within the tube, at least one of said glass members being formed from a glass having as an essential ingredient an amount of yttrium oxide sufficient to impart to said glass member said property of absorbing said X-rays.
A cathode-ray tube comprising a glass funnel portion, glass faceplate sealed thereto, a fluorescent screen on the inner surface of said faceplate, and an electron gun disposed within said sealed tube, at least one of said glass members being formed from a soda-potash-barium or a soda-potash-lead-barium glass containing up to 10 weight percent Y.sub.2 O.sub.3 as an essential component for absorption of X-radiation emitted from within the tube in the range of wavelengths between about 0.5 and 0.7A.
A cathode-ray tube comprising a glass funnel portion, glass faceplate sealed thereto, a fluorescent screen on the inner surface of said faceplate, and an electron gun disposed within said sealed tube, at least one of said glass members being formed from a soda-potash-barium or a soda-potash-lead-barium glass, said glass containing cerium oxide in an amount not exceeding 1 weight percent to protect against X-ray browning and also containing up to 10 weight percent Y.sub.2 O.sub.3 as an essential component for absorption of X-radiation emitted from within the tube in the range of wavelengths between about 0.5 and 0.7A.
A cathode-ray tube comprising a glass funnel portion, a glass faceplate sealed thereto, a fluorescent screen on the inner surface of said faceplate, and an electron gun disposed within said sealed tube, said tube having the property of absorbing X-rays emitted from within the tube, at least one of said glass members being formed from a glass containing Y.sub.2 O.sub.3 and having the following components in the weight percentages indicated:
- ______________________________________ Components Weight Percent ______________________________________ SiO.sub.2 45 - 70 Na.sub.2 O 3 - 10 K.sub.2 O 5 - 15 Al.sub.2 O.sub.3 0 - 6 CaO 0 - 8 MgO 0 - 3 BaO 0 - 20 Y.sub.2 O.sub.3 up to 15 PbO 0 - 30 Li.sub.2 O 0 - 2 F.sub.2 0 - 2 MnO 0 - 2 TiO.sub.2 0 - 1 Sb.sub.2 O.sub.3 0 - 1 CeO.sub.2 0 - 1 Rare Earths 0 - 1 ______________________________________
A glass containing Y.sub.2 O.sub.3 for absorption of X-rays consisting essentially of the following components in the indicated weight percentages:
- ______________________________________ Component Weight Percent ______________________________________ SiO.sub.2 45 - 70 Na.sub.2 O 3 - 10 K.sub.2 O 5 - 15 Al.sub.2 O.sub.3 0 - 6 CaO 0 - 8 MgO 0 - 3 BaO 0 - 20 Y.sub.2 O.sub.3 up to 15 PbO 0 - 30 Li.sub.2 O 0 - 2 F.sub.2 0 - 2 MnO 0 - 2 TiO.sub.2 0 - 1 Sb.sub.2 O.sub.3 0 - 1 CeO.sub.2 0 - 1 Rare Earths 0 - 1 ______________________________________
Dependencies are inferred from the claim text.