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US 6,570,349 B2Granted
Cathode-ray tube apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsJunichi Kimiya, Syunji Ookubo, Takahiro Hasegawa
Life of this patent
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Abstract
A second grid is supplied with a low potential acceleration voltage. A fourth grid and a sixth grid are supplied with a first focus voltage. A third grid and a seventh grid are supplied with a dynamic focus voltage (Vf2+Vd). A prefocus lens having a horizontal and vertical focusing function is formed between the second grid and the third grid. An asymmetrical lens section having a horizontal diverging function and a vertical focusing function is formed between the third grid and the fourth grid. The prefocus lens and the asymmetrical lens section are electrostatically coupled.
Claims23
A cathode-ray tube apparatus comprising:
- an electron gun assembly having an electron beam generating section which generates at least one electron beam, and a main electron lens section which focuses the electron beam emitted from the electron beam generating section on a phosphor screen;
- and
- a deflection yoke which produces deflection magnetic fields for deflecting the electron beam emitted from the electron gun assembly and causing the electron beam to horizontally and vertically scan the phosphor screen,
- wherein the electron gun assembly comprises a plurality of electrodes including a cathode supplied with a voltage of a relatively low first level, which constitute the electron beam generating section, at least one focus electrode supplied with a focus voltage of a second level higher than the first level, at least one dynamic focus electrode supplied with a dynamic focus voltage obtained by superimposing an AC component varying in synchronism with the deflection magnetic fields upon a reference voltage of a level close to the second level, and at least one anode supplied with an anode voltage of a third level higher than the second level,
- a first dynamic focus electrode supplied with the dynamic focus voltage is disposed adjacent to the electron beam generating section, and a first focus electrode supplied with the focus voltage is disposed adjacent to the first dynamic focus electrode,
- when the electron beam is deflected, a first electron lens section created between the electron beam generating section and the first dynamic focus electrode has a focusing function in horizontal and vertical directions, and a first asymmetrical lens section created between the first dynamic focus electrode and the first focus electrode has a relative diverging function in the horizontal direction and a relative focusing function in the vertical direction, and
- the first electron lens section and the first asymmetrical lens section are electrostatically coupled.
4 more elements
A cathode-ray tube apparatus comprising:
- an electron gun assembly having an electron beam generating section which generates an electron beam, and a main electron lens section which focuses the electron beam emitted from the electron beam generating section on a target;
- and
- a deflection yoke which produces deflection magnetic fields for horizontally and vertically deflecting the electron beam emitted from the electron gun assembly,
- wherein the electron gun assembly comprises a plurality of electrodes including a cathode supplied with a voltage of a relatively low first level, which constitute the electron beam generating section, at least one focus electrode supplied with a focus voltage of a second level higher than the first level, at least one dynamic focus electrode supplied with a dynamic focus voltage obtained by superimposing an AC component varying in synchronism with the deflection magnetic fields upon a reference voltage of a level close to the second level, at least one anode supplied with an anode voltage of a third level higher than the second level, and an insulating support member for supporting and fixing these electrodes,
- a first dynamic focus electrode supplied with the dynamic focus voltage is disposed adjacent to the electron beam generating section, and a first focus electrode supplied with the focus voltage is disposed adjacent to the first dynamic focus electrode, and
- the thickness of a peripheral portion of an electron beam passage hole formed in the first dynamic focus electrode for passing the electron beam emitted from the electron beam generating section is smaller than the thickness of the other part of the first dynamic focus electrode.
3 more elements
A cathode-ray tube apparatus comprising:
- an electron gun assembly having an electron beam generating section which generates an electron beam, and a main electron lens section which focuses the electron beam emitted from the electron beam generating section on a target;
- and
- a deflection yoke which produces deflection magnetic fields for horizontally and vertically deflecting the electron beam emitted from the electron gun assembly,
- wherein the electron gun assembly comprises a plurality of electrodes including a cathode supplied with a voltage of a relatively low first level, which constitute the electron beam generating section, at least one focus electrode supplied with a focus voltage of a second level higher than the first level, at least one dynamic focus electrode supplied with a dynamic focus voltage obtained by superimposing an AC component varying in synchronism with the deflection magnetic fields upon a reference voltage of a level close to the second level, at least one anode supplied with an anode voltage of a third level higher than the second level, and an insulating support member for supporting and fixing these electrodes,
- a first dynamic focus electrode supplied with the dynamic focus voltage is disposed adjacent to the electron beam generating section, and a first focus electrode supplied with the focus voltage is disposed adjacent to the first dynamic focus electrode,
- the thickness of a peripheral portion of an electron beam passage hole formed in the first dynamic focus electrode for passing the electron beam emitted from the electron beam generating section is smaller than the thickness of the other part of the first dynamic focus electrode, and
- wherein the first dynamic focus electrode has electrode reinforcement means comprising a recessed portion or a projecting portion at a region between the electron beam passage hole and an engaging portion to be fixed to the insulating support member.
4 more elements
Dependencies are inferred from the claim text.