EP 0708474 B1 20000906 - Cathode-ray tube display unit in which unwanted radiant electric field from face plate of cathode-ray tube is decreased
Title (en)
Cathode-ray tube display unit in which unwanted radiant electric field from face plate of cathode-ray tube is decreased
Title (de)
Kathodenstrahlröhreeinheit in die das vom Bildschirm unerwünschten Strahlungselektrischesfeld des Kathoderstrahlröhre vermindert ist
Title (fr)
Unité d'affichage à tube à rayons cathodiques dans laquelle les champs électriques radiant non-désirés venant de l'écran sont réduits
Publication
Application
Priority
- JP 25320894 A 19941019
- JP 30380894 A 19941207
Abstract (en)
[origin: EP0708474A1] A cathode-ray tube display unit provided with a high voltage transformer (20) for supplying high voltage to an anode of a cathode-ray tube (1), a deflection yoke (6) having a horizontal deflection coil and a vertical deflection coil, and an interior conductive coating (13) formed on the inside of a glass vessel of the cathode-ray tube (1), in which there is provided an electrode (8) in the conductive coating form formed on an external wall face of a glass vessel at a funnel portion (2) being electrically separated from an exterior graphite coating (5) formed on an external surface of the cathode-ray tube (1) and connected to ground, and a circuit for applying reverse pulse voltage V1 that satisfies (V0 x C0) > (V1 x C1) to the electrode in the conductive coating form is included. Where, it is assumed that flyback pulse voltage supplied to the deflection yoke means (6) is V0, reverse pulse voltage having a polarity reverse to that of voltage generated in the interior conductive coating (13) is V1, electrostatic capacity between the horizontal deflection coil and the interior conductive coating (13) is C0, and electrostatic capacity between the electrode (8) in the conductive coating form and the interior conductive coating (13) is C1. <IMAGE>
IPC 1-7
IPC 8 full level
H01J 29/00 (2006.01)
CPC (source: EP)
H01J 29/003 (2013.01); H01J 2229/0015 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0708474 A1 19960424; EP 0708474 B1 20000906; DE 69518713 D1 20001012; DE 69518713 T2 20010531; KR 100204724 B1 19990615; TW 395550 U 20000621
DOCDB simple family (application)
EP 95116440 A 19951018; DE 69518713 T 19951018; KR 19950035737 A 19951017; TW 87211602 U 19951016