JPS59127349A - Pick-up tube - Google Patents

Abstract

PURPOSE:To check frequent occurencd of loosening of a mesh while saving surplus parts being used for the former tube by providing electrodes of construction able to hold the desired interval between a photoconductive screen and a mesh electrode while somewhat enlarging the outer tube head part. CONSTITUTION:The head part of an outer tube 1 is expanded to the desired diameter and the length so as to enable a somewhat enlarged Z-shaped mesh electrode 9 to be inserted thereinto, while its tip part 7 is slightly built up followed by mirrorpolishing to increase width for indium pressure adhesion in order to be processed by molding so as to heighten the vacuumtight safety. Further, apart therefrom the space between the photoconductive screen 10 and the electrode mesh 9' is made to be of Z-shaped structure so as to hold the desired interval and further the side contacting with indium of the edge part 9'' of the electrode 9 is extremely thinly sharpened so that the compressive force to be applied in the normal direction of the electrode 9 caused by indium becomes extremely small even when indium is placed on the tip part 7 of the outer tube 1 for being pressure-adhered and accordingly the influence on the mesh 9' is almost lost.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in an electromagnetic focusing electrostatic deflection type spalling tube.

Conventionally known electromagnetic focusing electrostatic deflection type (hereinafter referred to as MS type)
The shape of the 'J'l picture tube, as shown in Figure 1A, is all straight-angled, and two indium rings 2.3 are used, with an insulating ring 4 interposed between them.

The face plate 5 and the outer tube 1 are assembled using indium pressure bonding, and the indium ring 2 is used for collecting the signal current, and the other indium ring 3 is used for applying voltage to the mesh electrode 6. is normal.

However, with this structure, as shown in Figure 2, an extra high-precision glass or ceramic insulating ring 4 and an indium ring 3 are used, and a high-precision outer tube assembly tool is required to assemble them. The need for additional ingredients is undesirable because it increases the manufacturing cost.

Further, the mirror-polished surface 7 of the outer tube, which has the same wall thickness, is generally used for indium compression bonding. However, the wall thickness of commercially available outer tubes is generally 08 to 0.85 mm, and the indium crimping width 7 is quite narrow. In addition, as shown in FIG. 1B, indium is crimped with the ring edge portion 8 of the mesh electrode 6, which is a cut metal plate, placed slightly on the crimping surface 7 of the outer tube 1. Since a part of the force is applied toward the center of the mesh electrode 6 through the indium ring 3, wrinkles often form in the menonu 6'. In addition, indium ring 3 and glass crimp IThT7
Since the contact area is extremely small, it is extremely difficult to maintain vacuum tightness.

The present invention is characterized by having an electrode structure in which the outer tube head is slightly enlarged and a desired distance can be maintained between the photoconductive surface and the mesh electrode. The objective is to prevent this and eliminate the unnecessary parts conventionally used in pipes.

In the outer tube of the present invention, as shown in FIGS. 2A and 2B, the head of the outer tube 10 can be expanded to a desired diameter and length, and the slightly enlarged double-shaped mesh electrode 9 can be inserted therein.

After the tip part 7 is slightly thickened, the width of the indium crimping is increased by mirror polishing, and a Z-shaped structure is formed to maintain the desired spacing between the true electrodes 9', and the end edge of the electrode 9 is The side of part 9'' in contact with indium is (i
By cutting thinly with η9th.

Even if it is placed on the tip 7 of the outer tube 1 and indium is crimped.

The compressive force applied in the normal direction of the electrode 9 caused by indium became extremely small, and therefore had almost no effect on the mesh q.

Note that the indium ring 3 of the tube according to the present invention is used to apply voltage to the mesh electrode 9, and the signal current is as follows.

It is arranged to be taken out from the lead pin 11 buried in the face plate.

In addition, because the head of the outer tube is slightly thickened and polished to a mirror finish, the polished surface is much wider than conventional tubes, and even if seven electrodes are placed on the polished surface, the polished surface can be made much wider. However, since the width of the indium pressure cured surface is sufficiently wide, vacuum tightness can be maintained completely.

In addition, the mesh support ring of the mesh electrode is made into a Z-shape, making it possible to maintain the desired distance between the photoconductive surface and the electrode, even though a space ring is not required (as in conventional tubes). By making the tip part around the sand extremely thin, we have completely eliminated the occurrence of sagging of the mesh caused by deformation of the indium during indium crimping.

[Brief explanation of the drawing]

FIGS. 1A and 1B are a sectional view and an enlarged sectional view of a conventional MS type image pickup tube. FIGS. 2A and 2B are a cross-sectional view and an enlarged cross-sectional view of an MS type image pickup tube according to the present invention. 1: Outer tube, 2: Indium ring on face plate side, 3: Indium ring interposed between outer tube and space ring, 4 Nice space ring, 5: Face plate, 6: Mesh electrode used in conventional tube, 6': Mesh Electrode mesh/yu, 7: Polished surface at the tip of the outer tube, 8: Tip of the mesh electrode, 9: Mesh electrode of the present invention, 9': Met/yu of 9, 10: Photoconductive surface, 11:
lead pin. Figure 1 (

Claims (1)

[Claims] After collecting the flesh at the end of the outer tube, mirror polishing is performed to widen the indium pressure seam and surface width, and the mesh electrode's support ring is made into a two-shape to create the desired spacing between the photoconductive surface and the mesh. The rli/image tube is characterized in that the tip of the mesh electrode, which is aligned with the indium around the menonille support ring, is cut very thinly.