Electron gun for cathode ray tube

An electron mm for a cathode ray tube, comprising:

• a signal cathode emitting thermions;
• first and second electrodes forming a triode structure with the cathode;
• a plurality of focus electrodes provided consecutively after the second electrode in a direction away from the cathode;
• an anode electrode mounted after a final focus electrode, the final focus electrode being farthest from the cathode among the focus electrodes;
• and
• a support that supports the electrodes in an aligned configuration,
• the final focus electrode and the anode electrode are mounted opposing one another with a predetermined gap therebetween, and
• when a lengthwise direction of phosphor layers forming a phosphor screen of the cathode ray tube is referred to as a Y axis direction, and a direction on perpendicular to the Y axis direction is referred to as an X axis direction, an electron beam aperture formed in a portion of the final focus electrode opposing the anode electrode, and an electron beam aperture formed in an area of the anode electrode opposing the final focus electrode have diameters in the X axis direction that are larger than diameters in the X axis direction of electron beam apertures formed in the electrodes between the cathode and the final focus electrode,
• wherein the final focus electrode includes an input section that is positioned on one side extending toward the cathode and an output section that is positioned on an opposite side extending toward the anode electrode,
• wherein the final focus electrode satisfies the following condition,
• D1<D2<D4
• where D1 is an outer diameter in the X axis direction of the input section of the final focus electrode, D2 is an outer diameter in the X axis direction of the output section of the final focus electrode, and D4 is an inner diameter in the X axis direction of a neck of the cathode ray tube into which the electron gun is inserted,
• wherein D2 and D4 satisfy the following condition,
• D2<0.65×D4.

An electron gun for a cathode ray tube, comprising:

• a single cathode emitting thermions;
• first and second electrodes forming a triode structure with the cathode;
• a plurality of focus electrodes provided consecutively after the second electrode in a direction away from the cathode;
• an anode electrode mounted after a final focus electrode, the final focus electrode being farthest from the cathode among the focus electrodes;
• and
• a support that supports the electrodes in an aligned configuration,
• the final focus electrode and the anode electrode are mounted opposing one another with a predetermined gap therebetween, and
• when a lengthwise direction of phosphor layers forming a phosphor screen of the cathode ray tube is referred to as a Y axis direction, and a direction perpendicular to the Y axis direction is referred to as an X axis direction, an electron beam aperture formed in a portion of the final focus electrode opposing the anode electrode, and an electron beam aperture formed in an area of the anode electrode opposing the final focus electrode have diameters in the X axis direction that are larger than diameters in the X axis direction of electron beam apertures formed in the electrodes between the cathode and the final focus electrode,
• wherein the final focus electrode includes an input section that is positioned on one side extending toward the cathode and an output section that is positioned on an opposite side extending toward the anode electrode,
• wherein the final focus electrode and the anode electrode satisfy the following condition,
• D1<D3<D4
• where D1 is an outer diameter in the X axis direction of the input section of the final focus electrode, D3 is an outer diameter in the X axis direction of the anode electrode, and D4 is an inner diameter in the X axis direction of a neck of the cathode ray tube into which the electron gun is inserted,
• wherein D3 and D4 satisfy the following condition,
• D3<0.65×D4.

An electron gun for a cathode ray tube, comprising:

• a single cathode emitting thermions;
• first and second electrodes forming a triode structure with the cathode;
• a plurality of focus electrodes provided consecutively after the second electrode in a direction away from the cathode;
• an anode electrode mounted after a final focus electrode, the final focus electrode being farthest from the cathode among the focus electrodes;
• and
• a support that supports the electrodes in an aligned configuration,
• the final focus electrode and the anode electrode are mounted opposing one another with a predetermined gap therebetween, and
• when a lengthwise direction of phosphor layers forming a phosphor screen of the cathode ray tube is referred to as a Y axis direction, and a direction perpendicular to the Y axis direction is referred to as an X axis direction, an electron beam aperture formed in a portion of the final focus electrode opposing the anode electrode, and an electron beam aperture formed in an area of the anode electrode opposing the final focus electrode have diameters in the X axis direction that are larger than diameters in the X axis direction of electron beam apertures formed in the electrodes between the cathode and the final focus electrode,
• wherein rims are formed in the electron beam aperture formed in the portion of the final focus electrode opposing the anode electrode, and in the electron beam aperture formed in the area of the anode electrode opposing the final focus electrode,
• wherein the electron beam aperture formed in the portion of the final focus electrode opposing the anode electrode, and the electron beam aperture formed in the area of the anode electrode opposing the final focus electrode are substantially elliptical with major axes in the X axis direction.

An electron gun for a cathode ray tube, comprising:

• a single cathode emitting thermions;
• first and second electrodes forming a triode structure with the cathode;
• a plurality of focus electrodes provided consecutively after the second electrode in a direction away from the cathode;
• an anode electrode mounted after a final focus electrode, the final focus electrode being farthest from the cathode among the focus electrodes;
• and
• a support that supports the electrodes in an aligned configuration,
• the final focus electrode and the anode electrode are mounted opposing one another with a predetermined gap therebetween, and
• when a lengthwise direction of phosphor layers forming a phosphor screen of the cathode ray tube is referred to as a Y axis direction, and a direction perpendicular to the Y axis direction is referred to as an X axis direction, an electron beam aperture formed in a portion of the final focus electrode opposing the anode electrode, and an electron beam aperture formed in an area of the anode electrode opposing the final focus electrode have diameters in the X axis direction that are larger than diameters in the X axis direction of electron beam anertures formed in the electrodes between the cathode and the final focus electrode,
• wherein the final focus electrode includes an input section that is positioned on one side extending toward the cathode and an output section that is positioned on an opposite side extending toward the anode electrode, where an inner diameter in the X axis direction of the output section is larger than an inner diameter in the X axis direction of the input section,
• wherein the input section has a substantially circular external shape in cross section, and the output section has a substantially elliptical outer shape in cross section.

An electron gun for a cathode ray tube, comprising:

• a single cathode emitting thermions;
• first and second electrodes formina a triode structure with the cathode;
• a plurality of focus electrodes provided consecutively after the second electrode in a direction away from the cathode;
• an anode electrode mounted after a final focus electrode, the final focus electrode being farthest from the cathode among the focus electrodes;
• and
• a support that support the electrodes in an aligned configuration,
• the final focus electrode and the anode electrode are mounted opposing one another with a predetermined gap therebetween, and
• when a lengthwise direction of phosphor layers forming a phosphor screen of the cathode ray tube is referred to as a Y axis direction, and a direction perpendicular to the Y axis direction is referred to as an X axis direction, an electron beam aperture formed in a portion of the final focus electrode opposing the anode electrode, and an electron beam aperture formed in an area of the anode electrode opposing the final focus electrode have diameters in the X axis direction that are larger than diameters in the X axis direction of electron beam apertures formed in the electrodes between the cathode and the final focus electrode,
• further comprising an intermediate electrode mounted between the final focus electrode and the anode electrode with a predetermined gap between the intermediate electrode and the final focus electrode and between the intermediate electrode and the anode electrode, the intermediate electrode receiving a voltage that is greater than a voltage applied to the final focus electrode and less than a voltage applied to the anode electrode, wherein a diameter of an electron beam aperture formed in the intermediate electrode is larger than the diameters of the electron beam apertures formed in the electrodes between the cathode and the final focus electrode,
• wherein the voltage applied to the intermediate electrode satisfies the following condition,
• 0.3×Yb<Vm<0.6×Yb
• where Vm is the voltage applied to the intermediate electrode and Yb is the voltage applied to the anode electrode.

An electron gun for a cathode ray tube, comprising:

• a single cathode emitting thermions;
• first and second electrodes forming a triode structure with the cathode;
• a plurality of focus electrodes provided consecutively after the second electrode in a direction away from the cathode;
• an anode electrode mounted after a final focus electrode, the final focus electrode being farthest from the cathode among the focus electrodes;
• and
• a support that supports the electrodes in an aligned configuration,
• the final focus electrode and the anode electrode are mounted opposing one another with a predetermined gap therebetween, and
• when a lengthwise direction of phosphor layers formina a phosphor screen of the cathode ray tube is referred to as a Y axis direction, and a direction perpendicular to the Y axis direction is referred to as an X axis direction, an electron beam aperture formed in a portion of the final focus electrode opposing the anode electrode, and an electronic beam aperture formed in an area of the anode electrode opposing the final focus electrode have diameters in the X axis direction that are larger than diameters in the X axis direction of electron beam apertures formed in the electrodes between the cathode and the final focus electrode,
• further comprising an intermediate electrode mounted between the final focus electrode and the anode electrode with a predetermined gap between the intermediate electrode and the final focus electrode and between the intermediate electrode and the anode electrode, the intermediate electrode receiving a voltage that is greater than a voltage applied to the final focus electrode and less than a voltage applied to the anode electrode, wherein a diameter of an electron beam aperture formed in the intermediate electrode is larger than the diameters of the electron beam apertures formed in the electrodes between the cathode and the final focus electrode,
• wherein the final focus electrode includes an input section that is positioned on one side extending toward the cathode and an output section that is positioned on an opposite side extending toward the intermediate electrode, an inner diameter of the output section being larger than an inner diameter of the input section, and the intermediate electrode including substantially identical inner and outer diameters as the output section of the final focus electrode and the anode electrode,
• wherein the electron beam apertures of the output section of the final focus electrode, the intermediate electrode, and the anode electrode are substantially elliptical with major axes in the X axis direction.

An electron gun for a cathode ray tube, comprising:

• a signal cathode emitting thermions;
• first and second electrodes forming a triode structure with the cathode;
• a plurality of focus electrodes orovided consecutively after the second electrode in a direction away from the cathode;
• an anode electrode mounted after a final focus electrode, the final focus electrode being farthest from the cathode among the focus electrodes;
• and
• a support that supports the electrodes in an aliened configuration,
• the final focus electrode and the anode electrode are mounted opposing one another with a predetermined gap therebetween, and
• when a lengthwise direction of phosphor layers forming a phosphor screen of the cathode ray tube is referred to as a Y axis direction, and a direction perpendicular to the Y axis direction is referred to as an X axis direction, an electron beam aperture formed in a portion of the final focus electrode opposing the anode electrode, and an electron beam aperture formed in an area of the anode electrode opposing the final focus electrode have diameters in the X axis direction that are larger than diameters in the X axis direction of electron beam apertures formed in the electrodes between the cathode and the final focus electrode,
• further comprising:
• a shield cup including a main surface through which an electron beam aperture is formed, the main surface contacting the anode electrode;
• and
• a plate electrode assembly having a pair of plate electrodes that are formed at a predetermined spacing on the main surface with the electron beam aperture provided between the plate electrodes, the plate electrodes extending into the anode electrode,
• wherein rims are formed in the electron beam aperture formed in the portion of the final focus electrode opposing the anode electrode, and in the electron beam aperture formed in the area of the anode electrode opposing the final focus electrode, and extensions are formed following a distal circumference of the rims and extending a predetermined distance into the final focus electrode and the anode electrode.

An electron gun for a cathode ray tube, comprising:

• a cathode emitting thermions;
• first and second electrodes forming a triode structure with the cathode;
• a plurality of focus electrodes provided consecutively after the second electrode in a direction away from the cathode;
• and
• an anode electrode mounted after a final focus electrode, the final focus electrode being farthest from the cathode among the focus electrodes,
• the final focus electrode and the anode electrode are mounted opposing one another with a predetermined gap therebetween, and
• when a lengthwise direction of phosphor layers forming a phosphor screen of the cathode ray tube is referred to as a Y axis direction, and a direction perpendicular to the Y axis direction is referred to as an X axis direction, an electron beam aperture formed in a portion of the final focus electrode opposing the anode electrode, and an electron beam aperture formed in an area of the anode electrode opposing the final focus electrode have diameters in the X axis direction that are larger than diameters in the X axis direction of electron beam apertures formed in the electrodes between the cathode and the final focus electrode,
• further comprising:
• a shield cup including a main surface through which an electron beam aperture is formed, the main surface contacting the anode electrode;
• and
• a plate electrode assembly having a pair of plate electrodes that are formed at a predetermined spacing on the main surface with the electron beam aperture provided between the plate electrodes, the plate electrodes extending into the anode electrode,
• wherein the plate electrodes are mounted such that widths of the plate electrodes are in the X axis direction.

An electron gun for a cathode ray tube, comprising:

• a single cathode emitting thermions;
• first and second electrodes forming a triode structure with the cathode;
• a plurality of focus electrodes orovided consecutively after the second electrode in a direction away from the cathode;
• an anode electrode mounted after a final focus electrode, the final focus electrode being farthest from the cathode among the focus electrodes;
• and
• a support that supports the electrodes in an aligned configuration,
• the final focus electrode and the anode electrode are mounted opposing one another with a predetermined gap therebetween, and
• when a lengthwise direction of phosphor layers forming a phosphor screen of the cathode ray tube is referred to as a Y axis direction, and a direction perpendicular to the Y axis direction is referred to as an X axis direction, an electron beam aperture formed in a portion of the final focus electrode opposing the anode electrode, and an electron beam aperture formed in an area of the anode electrode opposing the final focus electrode have diameters in the X axis direction that are larger than diameters in the X axis direction of electron beam anertures formed in the electrodes between the cathode and the final focus electrode,
• further comprising:
• a shield cup including a main surface through which an electron beam aperture is formed, the main surface contacting the anode electrode;
• and
• a plate electrode assembly having a pair of plate electrodes that are formed at a predetermined spacing on the main surface with the electron beam aperture orovided between the plate electrodes, the plate electrodes extending into the anode electrode,
• wherein the plate electrode assembly comprises:
• a fixing plate fixedly mounted to the shield cup, the fixing plate including an electron beam
• aperture communicating with the electron beam aperture of the shield cup;
• and
• the plate electrodes integrally formed to the fixing plate and extending from opposite long sides of the same.

An electron gun for a cathode ray tube, comprising:

• a single cathode emitting thermions;
• first and second electrodes forming a triode structure with the cathode;
• a plurality of focus electrodes provided consecutively after the second electrode in a direction away from the cathode;
• an anode electrode mounted after a final focus electrode, the final focus electrode being farthest from the cathode among the focus electrodes;
• and
• a support that supports the electrodes in an aligned configuration,
• the final focus electrode and the anode electrode are mounted opposing one another with a predetermined gap therebetween, and
• when a lengthwise direction of phosphor layers forming a phosphor screen of the cathode ray tube is referred to as a Y axis direction, and a direction perpendicular to the Y axis direction is referred to as an X axis direction, an electron beam aperture formed in a portion of the final focus electrode opposing the anode electrode, and an electron beam aperture formed in an area of the anode electrode opposing the final focus electrode have diameters in the X axis direction that are larger than diameters in the X axis direction of electron beam apertures formed in the electrodes between the cathode and the final focus electrode,
• wherein the electron beam aperture formed in the first electrode is elliptical with a major axis in a vertical direction, the electron beam aperture formed in the second electrodes is quadrilateral, and a slot is formed in a surface of the second electrode facing the focus electrodes, the slot being formed lengthwise in a horizontal direction.

An electron gun for a cathode ray tube, comprising:

• a single cathode emitting thermions;
• first and second electrodes forming triode structure with the cathode;
• a plurality of focus electrodes provided consecutively after the second electrode in a direction away from the cathode;
• an anode electrode mounted after a final focus electrode, the final focus electrode being farthest from the cathode among the focus electrodes;
• and
• a support that supports the electrodes in an aligned configuration,
• the final focus electrode and the anode electrode are mounted opposing one another with a predetermined gap therebetween, and
• when a lengthwise direction of phosphor layers forming a phosphor screen of the cathode ray tube is referred to as a Y axis direction, and a direction perpendicular to the Y axis direction is referred to as an X axis direction, an electron beam aperture formed in a portion of the final focus electrode opposing the anode electrode, and an electron beam aperture formed in an area of the anode electrode opposing the final focus electrode have diameters in the X axis direction that are larger than diameters in the X axis direction of electron beam apertures formed in the electrodes between the cathode and the final focus electrode,
• wherein the electron beam aperture formed in the first electrode is elliptical with a major axis in a horizontal direction, the electron beam aperture formed in the second electrodes is quadrilateral, and a slot is formed in a surface of the second electrode facing the focus electrodes, the slot being formed lengthwise in a vertical direction.