Cathode-ray tube with its display front protected from undesirable electrification
AssigneeHitachi, Ltd.
InventorKatsuyoshi Tamura
Life of this patent
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Abstract
A cathode-ray tube has an electrically conductive film formed over the surface of the panel portion of the tube, a transparent, electrical insulating layer formed on the conductive film and an electrode unit formed on the electrical insulating layer. The electrode unit is connected with a common potential line. A capacitor formed between the anode of the cathode-ray tube and the conductive film and a capacitor formed by the conductive film insulating layer and the electrode unit are electrically in series connection as viewed from a source for the voltage to be applied to the anode.
Claims23
A cathode-ray tube including an anode to be supplied with a high voltage in operation, comprising:
- a glass bulb having a panel portion;
- a transparent, electrical conductive film fixed with respect to an outer surface of said panel portion;
- a transparent, electrical insulating layer provided on said conductive film;
- and
- an electrode unit provided on said insulating layer and electrical connected with a common potential line, said high voltage being established with respect to said common potential, said electrode unit, said electrical insulating layer and said electrical conductive film forming a capacitor.
A cathode-ray tube including an anode to be supplied with a high voltage in operation, comprising:
- a glass bulb having a panel portion;
- a first transparent, electrical insulating layer provided over an outer surface of said panel portion;
- a transparent, electrical conductive film provided on said insulating layer;
- a second transparent, electrical insulating layer provided on said conductive film;
- an electrode unit provided on said second insulating layer;
- a tension band provided around a skirt of said panel portion;
- and
- an electrical conductive adhesive tape attached on said electrode unit and said tension band and being electrical connected with a common potential line for said high voltage, said electrode unit, said second insulating layer and said electrical conductive film forming a capacitor.
A cathode-ray tube including an anode to be supplied with a high voltage in operation, comprising:
- a glass bulb having a panel portion;
- a transparent, electrical conductive film provided over the surface of said panel portion;
- a transparent, electrical insulating layer provided on said conductive film, at least said insulating layer being roughened for preventing light reflection;
- an electrode unit provided on said reflection preventing layer;
- a tension band provided around a skirt of said panel portion;
- and
- an electrical conductive adhesive tape attached on said electrode unit and said tension band and being electrical connected with a common potential line for said high voltage, said electrode unit, said anti-reflection layer and said electrical conductive film forming a capacitor.
Dependencies are inferred from the claim text.