Electric power source assembly for focusing electrode of color cathode ray tube apparatus
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorShinji Nohara
Life of this patent
Estimating the term…
Abstract
An electric power source assembly supplies the focusing electrodes of a color cathode ray tube. Such a color cathode ray tube normally includes three electron guns arranged in a line transverse to their beam path. The focusing voltages supplied the focusing electrodes associated with the three guns are independently adjusted to compensate for beam distortion caused by positional differences in gun location. The D.C. and A.C. voltage to the static and or dynamic electrodes is independently controlled to improve beam focus of each individual gun.
Claims20
An electric power source assembly for focusing electrodes of a color cathode ray tube apparatus, comprising:
- a plurality of electron guns;
- focusing electrode sets, each associated with a said electron gun, for deflecting and focusing electron beams emitted from said guns;
- and
- electric power source circuit, applying a predetermined voltage to said focusing electrodes, said electric power source circuit separately controlling the voltage applied to the focusing electrodes for each electron gun.
An electric power source assembly for focusing electrodes of a color cathode ray tube apparatus, comprising:
- three electron guns arranged in a line transverse to their beam path;
- focusing electrode sets, each associated with a said electron gun and including a pair of dynamic electrodes and a pair of static electrodes associated with each said electron gun for deflecting and focusing an electron beam emitted therefrom;
- and
- electric power source circuit, applying a predetermined voltage to said focusing electrodes, said electric power source circuit including first and second DC voltage sources, the first D.C. voltage source independently controlling the voltage supplied to the dynamic electrodes of a center one of said electron guns, the second D.C. voltage source independently controlling the voltage supplied to the dynamic electrodes of the remaining two of said electron guns.
An electric power source assembly for focusing electrodes of a color cathode ray tube apparatus, comprising:
- three electron guns arranged in a line transverse to their beam path;
- focusing electrode sets, each associated with a said electron gun and including a pair of dynamic electrodes and a pair of static electrodes associated with each said electron gun for deflecting and focusing an electron beam emitted therefrom;
- and
- electric power source circuit for applying a predetermined voltage to said focusing electrodes, said electric power source circuit including first and second DC voltage sources, the first D.C. voltage source independently controlling the voltage supplied to the static electrodes of a center one of said electron guns, the second D.C. voltage source independently controlling the voltage supplied to the static electrodes of the remaining two of said electron guns.
A color cathode ray tube connectable to an external drive circuit and receiving drive voltages therefrom, comprising:
- three electron guns arranged in a line transverse to their beam path;
- a magnetic field generating means for deflecting and focusing electron beams emitted from each of said guns;
- focusing electrode sets, each associated with a said electron gun and including a pair of dynamic electrodes and a pair of static electrodes associated with each said electron gun for deflecting and focusing an electron beam emitted therefrom;
- and
- outlet leads connecting the color cathode ray tube to said external drive circuit, said outlet leads including plural focussing electrode outlet leads connected to at least one of said dynamic electrodes and said static electrodes to allow the focus of at least one of said electron guns to differ from the other of said electron guns.
A system for focusing the electron beams emanating from the plural electron guns of a color cathode ray tube comprising:
- a set of focussing electrodes associated with each said electron gun;
- and
- a focusing supply voltage generator supplying focusing voltages to each said set of focusing electrodes, said focussing supply voltage generator supplying different focusing voltages to focusing electrode sets associated with different electron guns.
Dependencies are inferred from the claim text.