JPS61225736A - Image pickup tube and manufacture thereof - Google Patents

Abstract

PURPOSE:To accurately fix a mesh electrode in an image pickup tube, by fitting a mesh holding ring on the peripheral surface of a mesh electrode support cylinder, providing a soft sealing metal on the outside of the ring, and integrally coupling these members to containers. CONSTITUTION:A mesh electrode 21 is attached to a holding ring 32 by a push ring 35. They are then mounted with a soft sealing metal on the peripheral surface of a mesh electrode support cylinder 33. These mounted members are then set with a soft sealing metal 34b inside the coupled end faces of a first and a second vacuum containers 12, 13. The members are then pressed by a push jig to push out the soft sealing metals in between the peripheral surface of the holding ring 32 and the inside circumferential surfaces of the containers 12, 13 and on the coupled surfaces of the containers to integrally couple these members together. For that reason, even if the holding ring 32 and the support cylinder 33 are slightly inaccurate in dimensions, the members can be firmly coupled together by the soft metals to perform accurate and mechanically stable assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image pickup tube and a method for manufacturing the same, and more particularly to improvements in the structure and method for fixing mesh electrodes.

[Technical background of the invention and its problems] For example, an electromagnetic focusing/electrostatic deflection type Ifi picture tube is provided with a mesh electrode close to the photoelectric conversion layer on the inner surface of the face plate for forming a uniform deceleration electric field. In order to apply a predetermined potential to this mesh electrode from outside the tube, an electrode lead is provided to penetrate a part of the vacuum vessel. Conventionally, such an m-image tube is constructed as shown in FIG. In the same figure, the code (11) is a glass face plate, and the code (12) is a glass face plate.
) is the first vacuum vessel made of glass, (13) is the second vacuum vessel, (14) and (15) are soft metal sealing materials such as indium (In), and (16) is the signal output electrode ring. , (former) is the photoelectric conversion layer, (18) is its transparent conductive layer, (19)
is the photoconductive layer, (2g) is the mesh electrode structure, (21) is the mesh and mesh electrode, (22) is the mesh retaining ring,
(23) is a mesh holding ring, (24) is a mesh electrode support tube, (25) is a zigzag electrode film called a defleftron for electron beam deflection, and (C) is a tube axis. To assemble such a structure, in is applied to the surfaces of the two cylindrical vacuum containers (12) and (13) to be joined, and the mesh electrode support tube (24) is placed inside and pressed. and airtightly connect. Then, a mesh holding ring (22) having a small protrusion (22a) is inserted inside this mesh electrode support tube (24), and the mesh holding ring (22) having a small protrusion (22a) is inserted.
). Note that the mesh electrode (21) is clamped and fixed between the mesh holding ring (22) and the mesh pressing ring (23).

According to such a structure, the mesh electrode support tube (24)
The mesh retaining ring is mainly attached to the inside of the small protrusion (2
2a) Since the structure is fixed mechanically, it is easy to assemble, but if the dimensional accuracy of each part is slightly different, stable fixation cannot be obtained and it may vibrate during use and cause noise. If the mesh electrode is worn too tightly, or if the mesh electrode is attached too tightly, the stress may easily cause the mesh electrode to become distorted.

[Purpose of the invention]

The present invention eliminates the above-mentioned disadvantages and provides a highly accurate and mechanically stable mesh electrode fixing structure and fixing method for an image pickup tube.

[Summary of the invention]

In the present invention, a mesh retaining ring is fitted onto the outer periphery of a mesh electrode support cylinder, and a part of the soft metal sealing material is placed in the gap between the outer peripheral surface of the mesh retaining ring and the inner peripheral surface of a surrounding vacuum container. This is an image pickup tube that is filled with and fixed. The manufacturing method is also characterized by the step of attaching a soft metal sealing material to the outer periphery of the mesh electrode support tube, and the process of attaching the mesh electrode support tube to the inside of the end surfaces to be joined of the first and second vacuum containers with a soft metal sealant. a process of sandwiching and setting a bonding material between the end faces of both vacuum containers to be joined; a process of fitting and arranging a mesh holding ring, in which the mesh electrode is sandwiched and fixed in advance with a presser ring, on the outer periphery of the mesh electrode support tube; The outer end surface of the first vacuum container and the mesh electrode holding ring located inside the first vacuum container are pressed by a holding jig to crush the soft metal sealing material and a part of the soft metal sealing material is pressed against the outer peripheral surface of the mesh holding ring. This method of manufacturing an image pickup tube includes a step of climbing up into a gap between the tube and the inner peripheral surface of a vacuum container and bonding and fixing the tube.

As a result, the mesh electrode assembly is stably fixed with its retaining ring covered with a soft metal sealing material such as In between the inner peripheral surface of the vacuum container and the outer surface of the inner mesh electrode support cylinder. Therefore, even if the mesh retaining ring and the mesh electrode support cylinder are slightly different in size, a strong bond can be obtained with the soft metal interposed between them.

[Embodiments of the invention]

Examples thereof will be described below with reference to the drawings. Identical parts are designated by the same reference numerals.

As shown in FIG. 1, the characteristic feature of the image pickup tube of the present invention in the assembled state is that the mesh holding ring (32) of the mesh electrode structure (manufactured by Mesh Electrode Assembly Co., Ltd.) is fitted onto the outer periphery of the mesh electrode support tube (33), and this holding The outer peripheral surface of the ring (32) and the first vacuum container (
A soft metal sealing material (34) such as indium (In) creeps up into the gap between the inner circumferential surface of the base plate 12) and is filled and fixed as one piece.

Next, a description will be given of a preferred assembly order.

First, as shown in Figure 2, the mesh electrode structure (phantom) is
Assemble. That is, a mesh electrode (21) is placed on the upper surface of a mesh retaining ring (32) made of a molybdenum (MO)-nickel (N i ) alloy plate with a thickness of about 0.18 m5 and formed into an inverted half-section. A relatively thick mesh holding ring (3
5) and secure by welding. Mesh retaining ring (32
) have dimensions such that their outer diameter is smaller than the inner diameter of the vacuum vessel, leaving a gap of about 0.5-1 between them. Similarly, as shown in FIG.
) is coated with In (34a) on the slightly lower part of the outer periphery, and the cross section is shaped into a substantially semicircular shape. This mesh electrode support 11
(33) is made of a stainless steel material having a sufficiently thick mechanical strength of, for example, 1.2 wm. And its outer diameter is
It has dimensions slightly smaller than the inner diameter of the mesh retaining ring (32).

Therefore, as shown in Fig. 4, a ring-shaped outer periphery holding jig (
A second glass vacuum container (13) is attached to the inside of the second vacuum container (13), and a mesh electrode support tube (3) is attached to the open end surface (13a) of the second vacuum container (13).
Place the coated 1n (34a) part on the outer periphery of 3). On top of that is a first vacuum container (12
) and place it.

Next, as shown in FIG. 5, the mesh electrode assembly is placed on the In (34a) by fitting its retaining ring (32) to the outside of the support tube (33).

Then, as shown in FIG. 6, a holding jig (37) is placed on the upper end surface (12a) of the first vacuum container (12) and inside thereof. This holding jig (31) has a step (H) between a surface (37a) that presses the end surface of the vacuum container and a surface (37b) that presses the inner ring-shaped mesh electrode structure, which allows the mesh to be removed from the photoelectric conversion layer of the m-picture tube. It is sized to substantially correspond to the spacing to the electrodes. In this way, the holding jig (37) is pressed downward as shown by the arrow (38). As a result, In
(34a) is crushed and flows between the joined end faces of the mountain-deep hollow container, and a part of 1n is crushed by the mesh retaining ring (34a).
It gradually creeps up into the gap (G) between the outer peripheral surface of 2) and the inner peripheral surface of the vacuum container (12). Rough presser jig (3
7) and press down to release the retaining ring (35) of the mesh electrode structure.
) comes into contact with the jig surface (37b) and pushes it down.

In this way, the 1y% empty container and the mesh electrode structure are inserted into the mesh electrode structure ln while maintaining the distance (H) using the jig, and the mesh electrode support tube (33) is inserted into the mesh electrode structure as shown in FIGS. 7 and 1.
The position is regulated and fixed in an integrated manner, including the The creeping portion (34b) of In flows along the gap between the mesh retaining ring (32) and the vacuum container to near the upper end of this ring and is stably fixed.

In this way, the mesh electrode assembly has its retaining ring between the inner circumferential surface of the vacuum chamber and the outer circumferential surface of the inner mesh electrode support cylinder.
It is covered with a soft metal sealing material such as in and is stably fixed. Therefore, even if the mesh retaining ring and the MEC 1 electrode support cylinder are slightly different in size, a strong bond can be obtained with the soft metal interposed between them. In addition, application of undesirable deforming force to the mesh electrode itself during these steps is also suppressed.

As shown in FIG. 8, the mesh electrode holding ring (32) has a plurality of through holes (41) slightly below its cylindrical portion.
(41)... may be formed in advance. As a result, as shown in FIG. 9, part of the In enters into the through hole (41) during the process of crushing the In, and the inner mesh electrode support tube (33)
), it can be fixed more precisely and mechanically stably.

〔Effect of the invention〕

As explained above, the present invention involves fitting a mesh retaining ring to the outer circumference of a mesh electrode support cylinder, and sealing a soft metal seal in the gap between the outer circumferential surface of the mesh retaining ring and the inner circumferential surface of a surrounding vacuum container. It is an mmjl tube formed by filling and fixing a part of the mesh electrode support tube, and the manufacturing method is characterized by attaching a soft metal sealing material to the outer periphery of the mesh electrode support tube, and attaching this mesh electrode support tube to the first and a soft metal sealing material is placed inside the end surfaces of the second vacuum container to be joined, and a soft metal sealing material is placed between the end surfaces of the two empty containers to be joined. The mesh holding ring that holds and fixes the mesh electrode is fitted and arranged, and the outer end surface of the first vacuum container and the mesh electrode holding ring located inside thereof are pressed by a holding jig to seal the soft metal sealing material. In this method, a portion of the soft metal sealing material is joined and fixed by crushing and creeping up into the gap between the outer peripheral surface of the mesh retaining ring and the inner peripheral surface of the vacuum container.

As a result, the mesh electrode assembly is stably fixed with its retaining ring covered with the soft metal sealing material between the inner peripheral surface of the vacuum container and the outer peripheral surface of the inner mesh electrode support cylinder. Therefore, even if the mesh retaining ring and the mesh electrode support cylinder are slightly different in size, a strong bond can be obtained with the soft metal interposed between them. Also with these steps Messi 11! Application of undesired deformation force to i itself is also suppressed. In this way, a highly accurate and mechanically stable II picture tube can be assembled relatively easily.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view of the main part showing the completed structure of an embodiment of the present invention, FIG. 2 is a perspective view of the main part showing the mesh electrode structure,
Fig. 3 is a perspective view of the main part of the mesh electrode support tube prepared in advance, Fig. 4 is a half-sectional view in the initial assembly process, Fig. 5 is a half-sectional view in the subsequent process, and Fig. 6 is in the next process. 7 is an enlarged sectional view of the main part in the completed state, FIG. 8 is a half sectional view of the main part showing another embodiment of the present invention, and FIG. 9 is a sectional view of the main part in the completed assembled state. , FIG. 10 is a half-sectional view of a main part showing a conventional structure. (11)...Face plate, (12)...First vacuum vessel, (13)...Second vacuum vessel, (V,)...Photoelectric conversion layer, (21)...Mesh electrode , (,U)...mesh electrode structure, (32)...mesh holding ring, (33)...mesh electrode support tube, (34), (34a), (34b)...soft metal seal Material loading, (35)...presser ring, (31)...presser jig.Representative Patent Attorney Noriyuki Chika (and 1 other person)Figure 1Figure 8Figure 9C

Claims (2)

[Claims] (1) It has a vacuum container in which an electron gun is disposed, and a face plate on which a photoelectric conversion layer is attached, and a mesh electrode provided close to the photoelectric conversion layer has a mesh electrode support tube and a mesh electrode. supported by a retaining ring;
In the mesh electrode fixing structure of an image pickup tube, these electrodes are electrically and mechanically supported by a soft metal sealing material which is sandwiched between the joined end surfaces of a cylindrical first and second vacuum container and hermetically sealed. The mesh retaining ring is fitted onto the outer circumference of the mesh electrode support cylinder, and a portion of the soft metal sealing material is placed in the gap between the outer circumferential surface of the mesh retaining ring and the inner circumferential surface of the surrounding vacuum container. An imaging tube characterized in that it is fixed with a filling interposition. (2) A step of attaching a soft metal sealing material to the outer periphery of the mesh electrode support cylinder; a step of sandwiching the mesh electrode between the end faces of both vacuum vessels to be joined; a step of fitting and arranging a mesh holding ring, in which the mesh electrode has been sandwiched and fixed in advance with a presser ring, on the outer periphery of the mesh electrode support cylinder; 1. Press the outer end surface of the vacuum container and the mesh electrode holding ring located inside the mesh electrode holding ring with a holding jig to crush the soft metal sealing material, and part of the soft metal sealing material to the mesh holding ring. A method for manufacturing an image pickup tube, comprising the step of climbing into a gap between an outer circumferential surface and an inner circumferential surface of a vacuum container and bonding and fixing the tube.