JPH0125409Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides an electron gun electrode structure for a cathode ray tube, in particular, a cathode ray tube electron gun in which an elastic supporter can be easily and precisely attached to a concentrated magnetic pole installed on the electron beam exit side of the electron gun electrode structure. This invention relates to an electrode structure.

Generally, in a cathode ray tube, in order to receive and reproduce high-quality images, it is necessary to precisely align the central axis of the electron gun electrode structure with the central axis of the cathode ray tube. Particularly in a color cathode ray tube, if the two axes mentioned above are offset from each other, multiple electron beams emitted from the electron gun are deflected by an electromagnetic deflection device installed outside the glass neck of the cathode ray tube. The color convergence operation that spatially correctly superimposes a plurality of color images on a shadow mask surface placed near the fluorescent surface becomes incomplete, and the reproduced image has color shift. Alternatively, the electron beam may not accurately strike the fluorescent surface phosphor element of a predetermined color, producing other colors, resulting in poor color purity, or the geometry of the reproduced image screen created by the electron beam on the fluorescent surface. The center of the target does not coincide with the geometric center of the fluorescent surface, and is shifted to one side, deteriorating the quality of the received and reproduced image. Therefore, the elastic support for holding the electron gun electrode assembly within the neck of the cathode ray tube glass envelope must be attached to an accurate predetermined position of the concentrated magnetic pole installed on the electron beam exit side of the electron gun electrode assembly.

First, a mechanism for holding an electron gun electrode assembly to the neck of a cathode ray tube glass envelope in a conventional in-line color cathode ray tube will be explained in detail with reference to FIGS. 1 and 2. A closed cylindrical body having a bottom surface with three electron beam transmission holes 2C drilled in a straight line, which is the final electrode on the electron beam exit side of the electron gun electrode structure 1.
A concentrated magnetic pole 3 in the shape of a cylindrical cylinder with a bottom, with three electron beam transmission holes bored in the bottom in a straight line to the flanged edge 2A formed perpendicularly to the cylindrical side part 2B of the G4 electrode 2.
is attached to the inner wall of the neck 5 of the cathode ray tube glass envelope by a plurality of elastic supports 4 attached to predetermined positions on the cylinder side of the concentrated magnetic pole 3, and the central axis of the electron gun electrode assembly 1 and the cathode ray tube glass envelope are attached to the inner wall of the neck 5 of the cathode ray tube glass envelope. The containers are held so that their central axes 7 are aligned with each other. Conventionally, the maximum diameter of the flanged edge 2A of the G4 electrode 2 is set to be less than the maximum diameter of the bottom surface of the concentrated magnetic pole 3, and the flanged edge 2A is designed so as not to protrude from the cylindrical side of the concentrated magnetic pole 3. on the other hand,
The elastic support 4 connects to the electron gun electrode via the concentrated magnetic pole 3 from a contact portion 4A that contacts an internal conductive coating 6 that is connected to an anode terminal (not shown) disposed in the funnel-shaped portion of the cathode ray tube glass envelope. A high anode voltage is supplied to the G4 electrode 2, which is the final electrode of the structure 1.

However, if the plurality of contact points 46 of the contact portions 4A of the plurality of elastic supports 4 to the internal conductive coating 6 are not in the same plane perpendicular to the central axis 7 of the cathode ray tube glass envelope, the central axis of the electron gun electrode assembly 1 does not coincide with the central axis of the cathode ray tube glass envelope, and is held at an angle to this, which significantly deteriorates the operating characteristics of the color cathode ray tube, as described above. Therefore, when attaching the elastic support 4, great care was required to correctly determine the predetermined position of the elastic support 4 with respect to the concentrated magnetic pole 3. For this reason, conventionally, when attaching the elastic supports 4, a positioning jig for the elastic supports 4 is inserted into the concentrated magnetic pole 3 to determine the mounting position. A method has been used in which the mounting portion 4B is fixed to the cylindrical side portion of the concentrated magnetic pole 3 by means such as welding, and then the jig is removed. However, this method requires a positioning jig when installing the elastic support 4, and it is also necessary to carry out welding work while firmly holding the elastic support 4 within the jig, resulting in extremely poor workability. . Alternatively, due to looseness in the jig, the height of the contact point 46 of the contact portion 4A of the plurality of elastic supports 4 attached to the internal conductive coating 6 may vary with respect to the bottom surface of the concentrated magnetic pole 3, and as a result, a plurality of The contact point 46 is not included in the same plane perpendicular to the central axis 7 of the cathode ray tube glass envelope, and is held tilted so that the central axis of the electron gun electrode assembly 1 and the central axis of the cathode ray tube glass envelope do not coincide. It had various drawbacks such as.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cathode ray tube electron gun electrode structure which eliminates the above-mentioned drawbacks and allows a plurality of elastic supports to be precisely and easily attached to the side of a concentrated magnetic pole tube.

The present invention consists of a bottomed cylindrical structure that holds the electron gun electrode structure on the inner wall of the neck of the glass envelope of the cathode ray tube, and has an elastic support that receives a high anode voltage from an internal conductive coating applied to the inner wall of the glass neck. In a cathode ray tube electron gun electrode assembly having a concentrated magnetic pole, the tube side of the closed cylindrical electrode, which is the final electrode on the electron beam exit side of the electron gun electrode assembly, has a bottom surface with a plurality of electron beam transmission holes. The bottom surface of the concentrated magnetic pole is attached to the flange-shaped edge formed perpendicularly to the part, and the diameter of the flange-shaped edge is concentrated so that at least a part of the flange-shaped edge protrudes from the bottom surface of the concentrated magnetic pole by the thickness of the elastic support. It is characterized by being set relatively larger than the diameter of the bottom surface of the magnetic pole.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 3 is a front view of the main part of the color cathode ray tube electron gun electrode assembly based on the present invention, with an elastic support 40 attached to the concentrated magnetic pole 30, and FIG. 4 is a front view of the final electrode of the electron gun electrode assembly used therein. a certain occluded cylinder
FIG. 2 is a perspective view of the G4 electrode 20. FIG. As shown in FIG. 3, the radius of the flange-shaped edge 20A of the closed cylindrical electrode 20 is made larger than the radius of the concentrated magnetic pole 30 by the thickness of the elastic support 40, or conversely, the radius of the concentrated magnetic pole 30 is made flange-shaped. The radius is set to be smaller than the radius of the edge 20A by about the thickness of the elastic supporter 40. To attach the elastic support 40, the lower end of the attachment part 40B is butted against the brim-shaped edge 20A of the G4 electrode 20 that protrudes from the bottom surface of the concentrated magnetic pole 30,
The jig determines only a predetermined position around the tube side of the concentrated magnetic pole 30 and fixes it by welding. The elastic support 40 extends the lower end of the mounting portion 40B so that the height of the contact point of the contact portion 40A to the internal conductive coating 6 with respect to the bottom surface of the concentrated magnetic pole 30 is the same as in the conventional case, and the lower end of the mounting portion 40B is extended so that the height of the contact point with respect to the internal conductive coating 6 of the contact portion 40A is the same as in the conventional case. The pressure applied to the inner wall of the neck 5 is kept constant.

According to the embodiment of the present invention, simply by abutting the attachment portion 40B of the elastic support 40 against the flanged edge 20A of the G4 electrode 20, the contact portions 40A of the plurality of elastic supports 40 can be easily attached to the inner wall of the internal conductive coating 6. All of the contacts must be uniquely contained within one plane perpendicular to the central axis of the cathode ray tube glass envelope, and the central axis of the electron gun electrode assembly and the central axis of the cathode ray tube glass envelope must coincide completely. Therefore, the work of attaching the elastic support member 40 becomes extremely efficient, and the image quality of the image receiving screen is significantly improved.

FIG. 5 shows another embodiment of the present invention, in which the closed cylindrical body electrode G4 electrode 2 is the final electrode of the electron gun electrode assembly.
1, in which a plurality of positioning protrusions 21D of the elastic supports 40 are provided on a part of the brim-like edge 21A. The positioning protrusion 21D is the G4 electrode 21
When attached to the bottom surface of the concentrated magnetic pole 30 with the flanged edge 21A, the concentrated magnetic pole 30 protrudes from the bottom surface of the concentrated magnetic pole 30 by at least the thickness of the elastic support 40.
The width is set to be relatively larger than the diameter of the bottom surface of the elastic support member 40, and its width is set to match the width of the attachment portion 40B of the elastic support member 40.

According to this embodiment, the elastic supporter 40 is connected to the concentrated magnetic pole 3
0, simply place the mounting part 40B against the positioning protrusion 21D of the G4 electrode 21 and match the width. Since the circumferential position of the cylinder side portion can be simultaneously and easily and uniquely determined, the installation work becomes extremely simple and efficient.

In the above description, an in-line type electron gun electrode structure including an integrated electrode has been described for convenience, but it goes without saying that the present application can be similarly applied to a delta type electron gun electrode structure.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional in-line electron gun electrode assembly held in the neck of a cathode ray tube glass envelope, and Fig. 2 is a perspective view showing a closed cylindrical G4 electrode used in this. , Fig. 3 is a front view of the main part showing the state in which the elastic support is attached to the concentrated magnetic pole based on the present invention, Fig. 4 is a perspective view of the closed cylindrical G4 electrode used in this, and Fig. 5 is the main part of the main part. FIG. 7 is a top view of a closed cylindrical body G4 electrode showing another embodiment of the invention. 1... In-line color electron gun electrode structure,
2, 20, 21...Occluded cylindrical body G4 electrode, 2A,
20A, 21A... Flange-shaped edge, 3, 30... Concentrated magnetic pole, 4, 40... Elastic supporter, 4A, 40A...
Contact portion, 4B, 40B... Attachment portion, 5... Neck of cathode ray tube glass envelope, 21D... Positioning protrusion.

Claims (1)

[Scope of utility model registration request] The electron gun electrode structure is held on the inner wall of the neck of the glass envelope of the cathode ray tube, and a concentrated magnetic pole in the shape of a bottomed cylinder is attached with an elastic support that receives a high anode voltage from an internal conductive coating applied to the inner wall of the glass neck. In the cathode ray tube electron gun electrode assembly, at least a part of the brim-like edge of the closed cylindrical electrode to which the concentrated magnetic pole is attached protrudes from the bottom surface of the concentrated magnetic pole by the thickness of the elastic support. Tube electron gun electrode structure.