KR870008368A - Electron Gun System for Color Cathode Ray Tubes - Google Patents

Abstract

No content

Description

Electron Gun System for Color Cathode Ray Tubes

Since this is an open matter, no full text was included.

5 is a top view of a self-converging total system according to the first aspect of the present invention having a field main focusing lens with system features indicated by closed tangents and extending three elements.

5A is an enlarged partial view of FIG.

5B shows a passage of two deviation beams in response to a change in focusing potential according to the invention based on FIG.

5B-1 is a partially enlarged view of FIG. 5B detailing the passage.

5C is a view similar to the fifth view showing another electrode structure to achieve the object of the present invention.

Claims (21)

Cathode means for generating an electron beam, A main focal lens means for receiving the electron beam and forming an electron beam spot focused on the screen of the tube and having a plurality of electrodes located coaxially; Said lens means constructed and arranged to form at least one asymmetric focusing field component between adjacent electrodes effective to deviate significantly from a straight line at a predetermined angle; And a means for generating a variable voltage and applying it to at least one of the electrodes, such that the intensity of the asymmetric field component, i.e., the angle at which the beam deviates, changes in response to the variable voltage. Tolerance gun system. The method of claim 1, The main focal lens means is one of three main focal lens means for receiving the electron beam and forming three focused electron beam spots on the screen of the tube, the main focal lens means being parallel and totally centered with respect to different lens axes, respectively. A plurality of electrode means spaced along a lens axis parallel to the axis, wherein at least two of the lens axes are axes deviated with respect to the total central axis, and the system forms one or more field components between the electrode means. Means for generating a potential to apply to the electrode means of each of the main focal lens means, wherein the off-axis main focus lens means each has at least one of the field components asymmetrical and the off-axis beam toward the periphery of the screen. In the case of a colored cathode-ray tube gun, characterized in that it is constructed and arranged to be effective to make it converge. System. 3. The method of claim 2, wherein the intensity of the asymmetric field component affecting the off-axis beam, which generates a voltage that undergoes a change in amplitude correlated with the scanning of the beam traversing the screen, changes in distance from the gun to which the beam converges. Means for applying the voltage to at least one of the electrodes of each of the focal lens means, which makes it possible to not only focus all the beams dynamically but also to provide a beam convergence measure for voltages undergoing amplitude changes. An electron gun system for a color cathode ray tube. The method of claim 2, Generate a dynamic focal voltage that undergoes amplitude variation correlated with the scanning of the beam traversing the screen, converging the intensity and beam of the asymmetric field component affecting the off-axis beam, causing the focal length of each of the beams to change; Means for applying the voltage to the focal electrode means of each of the lens means, which also changes the distance from the gun, which not only focuses all the beams, but also the dynamic focusing voltage Electron gun system for a color cathode ray tube, characterized in that provided. A screen comprising a multicolor light-emitting fluorescent element on the screen; Means for partially converging the beam on the screen as a function of the position of the beam, Cathode allowance for generating three electron beams, Receiving the electron beam and forming three focused electron beam spots on the screen of the tube, including focal electrode means, spaced along a lens axis parallel to the other lens axis and parallel to the total center axis, wherein Three main focal lens means comprising at least two focal electrode means in an off-axis situation with respect to the central axis; Means for generating a potential forming one or more field components between the electrode means and applying the potential to the electrode means of each of the main focal lens means; The off-axis main focal lens means each configured and arranged to cause at least one of the field components to be asymmetric and effective to partially converge the off-axis beam around the screen; Generate a dynamic focal voltage that undergoes a change in amplitude correlated with the scanning of the beam traversing the screen, causing the beam to converge with the intensity of the asymmetric field component that affects the off-axis beam, causing the focal length of each of the beams to vary; By applying the voltage to the focal electrode means of each of the lens means, which also changes the distance from the lens means, not only does it focus all the beams, but also the dynamic focus voltage of the total system supplies the partial beam convergence provided by the beam converging means. And means for providing a measure of beam convergence. The method of claim 5, The cathode ray tube comprises self-converging yoke means, thereby applying additional beam convergence measurements to reduce the need for magnetic convergence on the yoke by applying a dynamic focus voltage to each of the focusing electrode lens means. Color cathode ray tube, characterized in that provided. The method according to claim 5 or 6, Cathode ray tubes actually have a flat faceplate and associated flat tension shadow mask, A dynamic cathode voltage applied to each of the focusing electrode means provides a further measure of beam convergence to reduce the special demand for self-converging yoke due to the flatness of the faceplate. The method according to claim 5 or 6, The cathode ray tube has a curved plate with a screen having a multi-color phosphorescent element on the screen, the tube system comprising self-converging yoke means. Provide beam convergence in or for a color CRT, Cathode means for generating three electron beams parallel to the central axis of the gun, with two of the three beams off-axis relative to the central axis, A plurality of electrode means for each beam for shaping the convergence of the beam and focusing on the screen of the tube; First means for generating a pattern of potentials forming a field component in the gap between the electrodes and applying the potentials to the plurality of electrode means; Wherein the voltage is applied to at least one of the electrode means for each beam to generate a variable dynamic focus voltage to dynamically focus the beam when the beam is deflected across the screen, the plurality of electrodes for each off-axis beam. At least a selected electrode of the means is constructed and arranged such that the plurality of field components become asymmetrical and effective to converge the off-axis beams, the strength of the asymmetrical field component being dependent upon the change in the dynamic focus voltage applied to the electrode means. And change in response to the asymmetric field component in a direction effective to further deflect the common off-axis beam in a common angular direction due to a change in the level of the dynamic focus voltage. The dependence of the convergence of the deviation means on The electron gun system which is characterized in that has a polarity and intensity of the voltage of the pattern also comprises a second means which is applied in conditions such that. The method of claim 9, The CRT is self-converging yoke, and the system converges the beam when the beam is focused dynamically, so that part of the magnetic convergence desired to be obtained in the CRT system is achieved, so that the magnetic convergence to the yoke Electron gun system, characterized in that it is designed to reduce the requirements of. The method according to claim 9 or 10, Self-converging yoke and gun gun systems help to provide beam convergence to reduce the magnetic convergence demand on the yoke, Electrode means assist in receiving the beam and focusing the beam on the screen of the tube, The focus lens means for each beam comprises at least a focus electrode means and a second electrode means adjacent to the electrode means on a side away from the cathode means; Third electrode means for each beam on a side of said cathode means and disposed adjacent said focus electrode means; A potential of the pattern forming the first and second field components is generated in the gap between the third electrode means and the focus electrode means and between the focus electrode means and the second electrode means, and the potential is generated by the focus electrode means. First voltage generating means applied to said second and third electrode means, Causing the field component between the third electrode means and the focus electrode means and between the focus electrode means and the second electrode means to be asymmetrical and to affect convergence of the off-axis beam, the first and second The intensity of the asymmetrical field component changes in response to the change in the dynamic focusing voltage applied to the focusing electrode means and the asymmetrical field component causes a strong dependence of the convergence of the off-axis beam on the change in the focusing voltage. Configured and arranged so that a portion of the magnetic convergence desired to be obtained in the CRT system by converging the beam when the beam is focused is obtained so as to reduce the magnetic convergence demand for the yoke. The third electrode means for the beam, the focus electrode means, the focus electrode means and the second electrode number The electron gun system comprises a. The method of claim 11, The addressing surface and / or opening of the third electrode means and the focusing electrode means, and the addressing surface and / or opening of each of the focusing electrode means and the second electrode means for the off-axis beam are the asymmetric field component therebetween. An electron gun system configured and arranged to effect this asymmetry and affect convergence of the off-axis beam in response to a change in the dynamic focus voltage applied to the focal electrode means. The method of claim 12, And said addressing surface is parallel and angled with respect to said central axis, causing said asymmetry of the field component. The method of claim 12, At least one of said asymmetric field components is generated by offsetting said aperture. The method of claim 12, At least one opening adjacent one of the asymmetrical field components is offset from the central axis to produce an asymmetrical field, the addressing surface of the electrode adjacent to the other asymmetrical field component being parallel and angled with respect to the central axis, the Electron gun system, characterized by generating different asymmetric fields. The method of claim 10, The electron gun system has at least one intermediate electrode positioned between the main focus lens means for each beam, the focus electrode means, the anode electrode means, the focus electrode means and the anode electrode means, and the focus electrode means on the side facing towards the cathode means. A three-element extended field main focus lens in a situation comprising a pre focal electrode means for each beam disposed adjacent to The prefocus electrode means for applying a pattern of potentials forming the first and second field components to the gap between the prefocus electrode means and the focus electrode means and between the focus electrode means and the intermediate national means, respectively; First voltage generating means connected to said focus electrode means, said anode electrode means and said intermediate electrode means; The off-axis beam in response to a change in the dynamic focusing voltage applied to the focal electrode means such that the field component between the pre focal electrode means and the focal electrode means and between the focal electrode means and the intermediate electrode means is asymmetrical; And said prefocus electrode means, said focus electrode means, said focus electrode means and said intermediate electrode means for each said off-axis beam constructed and arranged to effect a convergence. The method of claim 10, The electron gun system comprises a four-element main focal lens comprising at least first, second, third and fourth electrode means together with pre-electrode means for each beam disposed adjacent to the first electrode means on the side facing towards the cathode means. Wow, One pattern in which the potential pattern forms a field component in the gap between the electrode means under a situation where the first electrode means is intermediate, the second electrode means is low, the third electrode means is intermediate, and the fourth electrode means is in its relationship. First means for generating an electric potential of and applying it to said electrode means, Cause the field component between the electrode means to be asymmetrical and affect the convergence of the off-axis beam, and the intensity of the asymmetrical field component to change in response to a change in the dynamic focusing voltage applied to the focal electrode. And said first electrode means and said second electrode means for each said off-axis beam constructed and arranged, and said second electrode means and said third electrode means. Cathode means for generating an electron beam, A main focal lens means for receiving the electron beam and forming an electron beam spot focused on the screen of the tube and having a plurality of electrode means located on a common axis; Means for generating and applying an electrical potential to said electrode means effective to form at least one focusing field component between said electrode means; Setting the focal length of the beam and the main focal lens means constructed and arranged so that at least one focusing field component is asymmetrical and effective to significantly deflect the electron beam at a predetermined angle from a straight line, between adjacent electrodes A first electrode means of the plurality of electrode means comprising a focus electrode means adapted to receive a focus voltage for Second electrode means of the plurality of electrode means cooperating with another one of the plurality of electrode means to form the asymmetric field component; And a means for generating a variable voltage and applying the voltage to the second electrode means to change the intensity of the asymmetric field component and thus the angle at which the beam deviates in response to the variable voltage. Tolerance gun system. The method of claim 18, The main focus lens means is one of three main focus lens means for receiving the electron beam and forming three focused electron beam spots on the screen of the tube, each of the main focus lens means being parallel to the other lens axis and having a total center A plurality of electrode means spaced along a lens axis parallel to the axis, at least two of the lens axes being off-axis with respect to the total central axis, The system comprises means for generating a potential forming one or more field components between the electrode means and applying it to the electrode means of each of the main focus lenses; The off-axis main focus lens means constructed and arranged to cause at least one of the field components to be asymmetrical and to be effective to converge off-axis beams in the vicinity of the screen; A first electrode means of the plurality of electrode means constituting each of the off-axis main focus lens means including a focus electrode means adapted to receive a focus voltage to set a focal length of an associated off-axis beam; Second electrode means of the plurality of electrode means constituting each of the off-axis main focal lens means including convergence electrode means cooperating with another of the plurality of electrode means to form the asymmetric field component; Generating a dynamic convergence voltage that undergoes an amplitude change correlated with the scanning of the beam across the screen and applying the voltage to the convergence electrode means of each of the off-focusing lens means, thereby affecting the off-axis beam Means for varying the intensity of the asymmetric field component and thus the distance from the beam convergent beam, thereby allowing the dynamic convergence voltage to dynamically converge while reducing the effect on beam focus. Electron gun system for a color cathode ray tube, characterized in that. The color cathode ray tube system comprises a screen with a multi-color phosphorescent element on the screen and comprises a constant field yoke means, a sheave, an inline electron gun system for exciting the phosphor element, The inline electron gun system comprises cathode means for generating the beam; Receiving the electron beam forms a three-focused electron beam spot on the screen of the tube, wherein one of the lens axes is on the central axis and two of the lens axes are off axis with respect to the total central axis. Three main focusing means having a plurality of electrode means parallel to and spaced along the lens axis parallel to the total central axis; Means for forming a potential forming one or more field components between the electrode means and applying the potential to the electrode means of each of the main focal lens means; Said off-axis focus lens means each constructed and arranged to cause at least one of said field components to be asymmetric and effective to converge off-axis beams around the screen; A first electrode means of said plurality of electrode means constituting each of said off-axis main focus lens means comprising a focus electrode means adapted to receive a focus voltage for setting a focal length of an associated off-axis beam; Second electrode means of the plurality of electrode means constituting each of the off-axis focus lens means including convergence electrode means cooperating with another of the plurality of electrode means to form the asymmetric field component; , Each generating a dynamic convergence voltage that undergoes an amplitude change correlated with the scanning of the beam traversing the screen and varying the intensity of the asymmetric field component affecting the off-axis beam and the distance from the beam-converging gun Means for causing the dynamic convergence voltage to converge the beam dynamically while reducing the effect on the beam focus by applying the voltage to the convergence electrode means of the off-axis focus lens means of the apparatus. Color cathode ray tube system. The screen is arranged on a substantially flat faceplate with an associated flat tension shadow mask, which allows the use of a constant field yoke, as a result of which the beam deflection and distortion of the beam on the side of the screen are reduced. Color cathode ray tube system. ※ Note: The disclosure is based on the initial application.