JPS6011545Y2 - mesh electrode - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dome-shaped mesh electrode used in an electrostatic deflection type cathode ray tube.

In an electrostatic deflection type cathode ray tube for observation, a mesh electrode is disposed in front of the deflection electrode of the electron gun in order to improve brightness and deflection sensitivity.

In particular, a spherical mesh electrode is used to improve deflection sensitivity over the entire surface in the X-axis direction and the Y-axis direction.

Conventionally, a flat mesh was sandwiched between a pair of annular mesh support frames, the periphery of the mesh support frames was spot welded, and the mesh was extruded and hot-formed using a mold with a fixed waist spherical protrusion. .

However, when spot welding is performed on the mesh support frame, if the intervals between the spot welds are wide, distortion (wrinkles) will occur in the mesh due to the difference in thermal expansion, and if the intervals between the spot welds are narrow, workability will be poor.

On the other hand, an annealed aluminum annular mesh support frame is used, a flat mesh is covered with the frame, and the mesh is molded into a spherical shape using a mold having spherical protrusions while the mesh periphery is crimped to the support frame. Mesh electrodes are known.

However, since this mesh electrode uses an aluminum support frame, it cannot be welded, and there is a problem in that it is difficult to fix it to an electron gun or to take out the electrode lead wire.

The present invention has been proposed in view of the above-mentioned problems, and provides a mesh electrode that can be welded and that can also crimp and fix a mesh.

The present invention will be explained below with reference to the drawings.

In the figure, 1 is a weldable bottomed cylindrical body made of stainless steel, nickel, etc., and a circular through hole 1b is bored in the bottom surface 1a to form a first annular body.

Reference numeral 2 denotes a pressure bonding layer (second annular body) which is laminated on the inner surface of the bottom surface 1a of the bottomed cylindrical body 1 and is made of a soft metal such as silver or aluminum. This constitutes the mesh support frame 3.

Reference numeral 4 indicates a mesh whose peripheral edge is crimped and fixed to the pressure bonding layer 2 and whose center portion is protruded in a spherical shape.

According to this, since the mesh 4 can be fixed to the support frame 3 by pressure bonding, workability is good, and there is no thermal expansion due to welding, so that no distortion occurs on the mesh surface.

Further, since the support pieces, electrode lead wires, etc. for assembling and fixing into the electron gun can be welded and fixed to the support frame 3, assembly of the electron gun is easy.

The pressure bonding layer 2 may be formed by mesh or vapor deposition, or as shown in FIG. A crimp plate 6 made of, for example, aluminum ram, which is in contact with the support frame 1 and has a protrusion 6a formed at a position corresponding to the through hole 5 or notch, is brought into close contact with the bottom surface 1a of the support frame 1, and the protrusion 6a is fixed by caulking or bending. Good too.

The inner diameter of the pressure bonding layer 2 may be made smaller than the through hole 1b, and the peripheral edge of the pressure bonding layer 2 protruding from the through hole 1b may be bent toward the surface of the spherical surface of the mesh as shown in FIG.

This not only expands the crimping area and improves the bonding strength, but also improves the formability of the spherical shape.

Further, the support frame 3 may omit the cylindrical portion if necessary.

As described above, according to the present invention, the spherical mesh electrode can be molded without distortion and can be welded to the support frame, making it easy to assemble the electron gun.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention, and FIGS. 2 and 3 are side sectional views showing other embodiments of the present invention. 1a...First annular body, 2...Second annular body, 4...Mesh.

Claims (1)

[Scope of utility model registration request] a first annular body made of a weldable metal; a second annular body made of a crimped metal and laminated on the first annular body; A mesh electrode characterized by comprising a mesh protruding into a spherical shape.