JPH086360Y2 - Electron gun assembly for cathode ray tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electron gun assembly for a cathode ray tube, and more particularly to an improvement of an electron gun electrode assembly.

[Conventional technology]

Conventionally, in a cathode ray tube, an electron lens that accurately forms an electron beam on the screen of the cathode ray tube by using a plurality of electrodes for controlling and accelerating the electron beam emitted from the cathode is called an electron gun assembly. I'm out.

The electron gun assembly is composed of a plurality of electrodes. Particularly, in the case of an in-line type electron gun assembly, a red electron gun, a green electron gun, and a blue electron gun can be adjusted by adjusting the distance between the first grid electrode and the second grid electrode. The structure was such that the intervals between electron guns were uniform.

[Problems to be solved by the invention]

The area around the central electron hole of the first grid electrode is a thin flat plate shape, and the first grid electrode is heated and softened by an insulating glass called multiform glass to keep a certain distance from other electrodes to prevent inset. At that time, since a protrusion for fitting is provided in the central portion of the first lattice electrode and pressure is applied, the periphery of the central electron hole in the central portion of the first lattice electrode is compared with the periphery of both side electron holes. Then rises in a convex shape toward the second grid electrode side,
There is a drawback that the distance between the first grid electrode and the second grid electrode cannot be accurately maintained.

[Means for solving problems]

The first grid electrode of the present invention prevents the periphery of the central electron hole from being raised to the second grid electrode side in a convex shape in response to the pressure applied to the multi-form glass. The structure around the central electron hole is reinforced by a disc-shaped ring to distribute pressure distortion over the entire area and eliminate the unevenness of the intervals.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

 FIG. 1 is a sectional view of an embodiment of the present invention.

In FIG. 1, the first grid electrode 1 is one of electron holes on both sides (generally a red electron gun electrode hole) 2, a central electron hole (generally a green electron gun electrode hole) 3, the other of both side electron holes (generally a blue electron gun electrode). Hole 4).

The disc-shaped ring 6 of the present invention is welded by laser or electric resistance welding so as to be in contact with the embossed outer peripheral portion 5 of the green electron gun electrode hole 33.

 FIG. 2 is a top view of FIG.

In FIG. 2, the X mark on the disc-shaped ring 6 indicates a welding point.

FIG. 3 shows that the first grid electrode welded to the disk-shaped ring 6 of the present invention is used and is embedded in the multi-form glass 8 together with the second grid electrode 7 to form the first grid electrode 1 and the second grid electrode 7.
Shows a state in which the interval is constant.

In the electron gun assembly thus constructed, the electrode plate thickness of the green electron gun electrode hole 3 is 0.06 m / m, and the disc-shaped ring 6 of the present invention is used.
If the plate thickness of 0.25 m / m is set to 0.25 m / m, the change in the distance between the first grid electrode 1 and the second grid electrode 7 after the conventional filling without using the disc-shaped ring 6 was 12 to 15 μm. By using the disk-shaped ring 6 of the invention, it was possible to improve the interval change of 2μ.

[Effect of device]

As described above, according to the present invention, by welding the disc-shaped ring to the embossed outer peripheral portion of the green electron gun electrode hole of the first lattice electrode, even if the first lattice electrode is embedded in the multi-form glass, The green electron gun electrode hole does not bulge in a convex shape toward the second grid electrode side, and there is an effect that the distance between the first grid electrode and the second grid electrode can be accurately maintained.

[Brief description of drawings]

FIG. 1 is a sectional view of the first grid electrode of the present invention, and FIG.
FIG. 3 is a top view of the figure, and FIG. 3 is a side view showing a state of a gap between the first grid electrode and the second grid electrode of the present invention. 1 ... First grid electrode, 2 ... Red electron gun electrode hole, 3 ... Green electron gun electrode hole, 4 ... Blue electron gun electrode hole, 5 ... Embossed outer peripheral portion, 6 ... Disc ring, 7 ... second grid electrode, 8
…… Multifoam glass.

Claims (1)

[Scope of utility model registration request] 1. An electron gun for a cathode ray tube, characterized in that a disk-shaped ring is attached to a peripheral portion of a central electron hole of an electron gun first grid electrode, and a distance between the first grid electrode and the second grid electrode is kept constant. Structure.