Cathode ray tube with low dynamic correction voltage
First Claim
1. A cathode ray tube provided with an electron gun having at least an electron beam generating unit comprising a cathode, a first grid electrode and a second grid electrode arranged in the order named for generating a plurality of electron beams arrayed in a horizontal direction and for controlling said plurality of electron beams, comprising:
- a main lens unit comprising a plurality of electrodes including a focus electrode and a final accelerating electrode for focusing said plurality of electron beams onto a fluorescent screen, said focus electrode comprising a plurality of electrode members, and said final accelerating electrode being disposed downstream of said focus electrode and adapted to be supplied with a first voltage;
a final main lens formed between said final accelerating electrode and one of said plurality of electrode members adjacent to said final accelerating electrode;
an electrostatic quadrupole lens formed in a first space between adjacent ones of said plurality of electrode members, one of said adjacent ones of said plurality of electrode members defining said first space being adapted to be supplied with a first focus voltage of a fixed value, another of said adjacent ones of said plurality of electrode members defining said first space being adapted to be supplied with a second focus voltage comprised of a fixed voltage and a dynamic voltage varying in synchronism with deflection of said plurality of electron beams, said first and second focus voltages being lower than said first voltage, but being higher than a voltage applied to said second grid electrode, and said electrostatic quadrupole lens being configured so as to focus said plurality of electron beams in one of the horizontal and vertical directions and to diverge said plurality of electron beams in another of the horizontal and vertical directions depending upon which is the higher of said first focus voltage and said second focus voltage; and
a third electrostatic lens disposed between said final main lens and said electrostatic quadrupole lens and formed in a second space between adjacent ones of said plurality of electrode members, one of said adjacent ones of said plurality of electrode members defining said second space being adapted to be supplied with said first focus voltage, another of said adjacent ones of said plurality of electrode members defining said second space being adapted to be supplied with said second focus voltage, and said third electrostatic lens being configured so as to decrease a focusing action on said plurality of electron beams in both the horizontal and vertical directions with increasing deflection of said plurality of electron beams.
0 Assignments
0 Petitions
Accused Products
Abstract
An electron gun of a cathode ray tube includes an electron beam generating unit and a main lens unit. The electron beam generating unit includes a cathode, a first grid electrode and a second grid electrode, and the main lens unit is formed of plural electrode members and a final accelerating electrode disposed downstream thereof and supplied with a high voltage. A final main lens is formed between the final accelerating electrode and one of the electrode members adjacent thereto. An electrostatic quadrupole lens is formed in a first space between adjacent ones of the electrode members, one of which is supplied with a first focus voltage of a fixed value, another of which is supplied with a second focus voltage synchronized with electron beam deflection, wherein the first and second focus voltages are higher than a second grid electrode voltage. The quadrupole lens focuses the electron beams horizontally and vertically and diverges them horizontally and vertically depending upon which is the higher of the first and second focus voltages. A third electrostatic lens is disposed between the final main lens and the quadrupole lens and formed in a second space between adjacent ones of the electrode members, one of which is supplied with the first focus voltage, and another of which is supplied with the second focus voltage, and the third electrostatic lens decreases horizontal and vertical focusing actions on the electron beams with increasing electron beam deflection.
-
Citations
27 Claims
-
1. A cathode ray tube provided with an electron gun having at least an electron beam generating unit comprising a cathode, a first grid electrode and a second grid electrode arranged in the order named for generating a plurality of electron beams arrayed in a horizontal direction and for controlling said plurality of electron beams, comprising:
-
a main lens unit comprising a plurality of electrodes including a focus electrode and a final accelerating electrode for focusing said plurality of electron beams onto a fluorescent screen, said focus electrode comprising a plurality of electrode members, and said final accelerating electrode being disposed downstream of said focus electrode and adapted to be supplied with a first voltage;
a final main lens formed between said final accelerating electrode and one of said plurality of electrode members adjacent to said final accelerating electrode;
an electrostatic quadrupole lens formed in a first space between adjacent ones of said plurality of electrode members, one of said adjacent ones of said plurality of electrode members defining said first space being adapted to be supplied with a first focus voltage of a fixed value, another of said adjacent ones of said plurality of electrode members defining said first space being adapted to be supplied with a second focus voltage comprised of a fixed voltage and a dynamic voltage varying in synchronism with deflection of said plurality of electron beams, said first and second focus voltages being lower than said first voltage, but being higher than a voltage applied to said second grid electrode, and said electrostatic quadrupole lens being configured so as to focus said plurality of electron beams in one of the horizontal and vertical directions and to diverge said plurality of electron beams in another of the horizontal and vertical directions depending upon which is the higher of said first focus voltage and said second focus voltage; and
a third electrostatic lens disposed between said final main lens and said electrostatic quadrupole lens and formed in a second space between adjacent ones of said plurality of electrode members, one of said adjacent ones of said plurality of electrode members defining said second space being adapted to be supplied with said first focus voltage, another of said adjacent ones of said plurality of electrode members defining said second space being adapted to be supplied with said second focus voltage, and said third electrostatic lens being configured so as to decrease a focusing action on said plurality of electron beams in both the horizontal and vertical directions with increasing deflection of said plurality of electron beams. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A cathode ray tube provided with an electron gun having at least an electron beam generating unit comprising a cathode, a first grid electrode and a second grid electrode arranged in the order named for generating a plurality of electron beams arrayed in a horizontal direction and for controlling said plurality of electron beams, comprising:
-
a main lens unit comprising a plurality of electrodes including a focus electrode and a final accelerating electrode for focusing said plurality of electron beams onto a fluorescent screen, said focus electrode comprising a plurality of electrode members, and said final accelerating electrode being disposed downstream of said focus electrode and adapted to be supplied with a first voltage;
a final main lens formed between said final accelerating electrode and one of said plurality of electrode members adjacent to said final accelerating electrode;
an electrostatic quadrupole lens formed in a first space between adjacent ones of said plurality of electrode members, one of said adjacent ones of said plurality of electrode members defining said first space being adapted to be supplied with a first focus voltage of a fixed value, another of said adjacent ones of said plurality of electrode members defining said first space being adapted to be supplied with a second focus voltage comprised of a fixed voltage and a dynamic voltage varying in synchronism with deflection of said plurality of electron beams, said first and second focus voltages being lower than said first voltage, but being higher than a voltage applied to said second grid electrode, and said electrostatic quadrupole lens being configured so as to focus said plurality of electron beams in one of the horizontal and vertical directions and to diverge said plurality of electron beams in another of the horizontal and vertical directions depending upon which is the higher of said first focus voltage and said second focus voltage; and
a third electrostatic lens disposed between said final main lens and said electrostatic quadrupole lens and formed in a second space between adjacent ones of said plurality of electrode members, one of said adjacent ones of said plurality of electrode members defining said second space being adapted to be supplied with said first focus voltage, another of said adjacent ones of said plurality of electrode members defining said second space being adapted to be supplied with said second focus voltage, and said third electrostatic lens being configured so as to decrease a focusing action on said plurality of electron beams in both the horizontal and vertical directions with increasing deflection of said plurality of electron beams; and
a fourth electrostatic lens formed in a third space between adjacent ones of said plurality of electrode members, said fourth electrostatic lens being a non-axisymmetric lens configured so as to focus said plurality of electron beams in both the horizontal and vertical directions, focusing said plurality of electron beams stronger in the horizontal direction than in the vertical direction. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A cathode ray tube provided with an electron gun having at least an electron beam generating unit comprising a cathode, a first grid electrode and a second grid electrode arranged in the order named for generating a plurality of electron beams arrayed in a horizontal direction and for controlling said plurality of electron beams, comprising:
-
a main lens unit comprising a plurality of electrodes including a focus electrode and a final accelerating electrode for focusing said plurality of electron beams onto a fluorescent screen, said focus electrode comprising a plurality of electrode members, and said final accelerating electrode being disposed downstream of said focus electrode and adapted to be supplied with a first voltage;
a final main lens formed between said final accelerating electrode and one of said plurality of electrode members adjacent to said final accelerating electrode for focusing said plurality of electron beams in both the horizontal and vertical directions;
an electrostatic quadrupole lens formed in a first space between adjacent ones of said plurality of electrode members, one of said adjacent ones of said plurality of electrode members defining said first space being adapted to be supplied with a first focus voltage of a fixed value, another of said adjacent ones of said plurality of electrode members defining said first space being adapted to be supplied with a second focus voltage comprised of a fixed voltage and a dynamic voltage varying in synchronism with deflection of said plurality of electron beams, said first and second focus voltages being lower than said first voltage, but being higher than a voltage applied to said second grid electrode, and said electrostatic quadrupole lens being configured so as to focus said plurality of electron beams in one of the horizontal and vertical directions and to diverge said plurality of electron beams in another of the horizontal and vertical directions depending upon which is the higher of said first focus voltage and said second focus voltage; and
a third electrostatic lens formed in a second space between adjacent ones of said plurality of electrode members, one of said adjacent ones of said plurality of electrode members defining said second space being adapted to be supplied with said first focus voltage, another of said adjacent ones of said plurality of electrode members defining said second space being adapted to be supplied with said second focus voltage, and said third electrostatic lens being configured so as to decrease a focusing action on said plurality of electron beams in both the horizontal and vertical directions with increasing deflection of said plurality of electron beams and so as to focus said plurality of electron beams stronger in the horizontal direction than in the vertical direction. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
-
Specification