JPS5834677Y2 - Image tube - Google Patents

Description

[Detailed description of the invention] The present invention has a 1-inch face plate equipped with a photoelectric conversion section, and a 2/3 glass cylindrical tube section containing an electron gun assembly.
The present invention relates to a composite type image pickup tube having a diagonal-shaped structure, and particularly relates to the shape of a shoulder portion that is a connecting portion between a face plate and a glass circular tube portion.

Generally, in a single-tube color image pickup tube of a phase separation type or a three-electrode separation type, a signal extraction terminal is often provided at or near the face plate 1.

In the case of the phase separation method, it is necessary to provide two signal extraction terminals, and in the case of the three-electrode separation method, it is necessary to provide three signal extraction terminals.

(See Figure 1 a, l)) Providing a signal extraction terminal from a 1-inch face plate has already been completed using known technology, but it is also possible to provide a signal extraction terminal from a 2/3-inch face plate I. In this case, it is technically difficult to obtain the required scanning area for the charging converter, etc. and provide two or three vacuum-tight signal extraction terminals in the excess area around the outer circumference due to the small area of the face plate. .

Therefore, a 1-inch face plate is used, which is easy to equip with a signal extraction terminal, and a 1-inch target part is provided with a predetermined photoelectric conversion section and a signal extraction terminal, and a 2-inch face plate is used.
The end face of the shoulder part made by widening one end of the 3-inch glass cylindrical tube to 1 inch is crimped with indium, and the 2/
An image pickup tube manufactured by enclosing a 2/3 inch electron gun from the other end of a 3 inch glass cylindrical tube (with a 1 inch face plate,
An image pickup tube (with a 2/3 inch diameter glass cylindrical tube enclosing an electron gun assembly) has come into practical use.

FIG. 2 shows a composite image pickup tube with a conventional structure, and FIG. 3 is a schematic diagram for explaining a conventional crimping method.

1 is a 1-inch face plate, 2 is a charging converter, 3 is a signal output terminal, 4 is a shoulder part, 5 is a 2/3-inch glass cylindrical tube, 6 is an electron gun assembly, 7 is indium, 7' is In the target ring, 8 is the direction of the pressing force (line of force), 9 is the contact portion between the shoulder portion and the jig, 10 is the glass cylindrical tube fixing jig, and 11 is the shoulder portion face plate crimping surface.

When manufacturing the composite image pickup tube shown in FIG. 2, when the 1-inch face plate 1 is crimped to the shoulder face plate crimping surface 11 via indium 7, the shoulder part 4 is not flat, so the third As shown in the figure, if the contact portion 9 between the jig 10 and the shoulder portion 4 is located away from the direction 8 of the crimping force, the force acting on the jig 10 and the contact portion 9 becomes a bending moment. A force greater than the pressing force acts on the contact portion 9.

For example, if a pressure force P is applied in Fig. 3,
A reaction force is generated at a distance l from the direction 8 of the pressing force, and the bending moment is PXl.

Therefore, a tensile force acts on the inside of the shoulder portion 4 near the contact portion 9.

In general, glass has a property of tensile force x 10 - compressive force, and because it is weak against tensile force, it has the disadvantage that the shoulder portion often breaks when crimped.

In order to eliminate these drawbacks, the present invention provides a protrusion at the waste end of the shoulder part of the glass cylindrical tube, and in the case of crimping, the crimping force is reduced to the face plate - indium - shoulder part wall - protrusion -
It is characterized by a shape that does not apply a large force to the jig and to the shoulder portion, which has no protrusion, and its purpose is to prevent the shoulder portion from breaking during crimping.

A schematic diagram for explaining the shape of the eyebrow end of the shoulder portion of the present invention and crimping according to the present invention is shown in FIGS. 4a and 1), and since the same symbols as in FIG.

12 is a protrusion. FIG. 4 a, l) will be explained.

A plurality of protrusions 12 having a thickness equal to or slightly larger than the glass tube wall thickness of the shoulder part 4 are provided at the eyebrow end of the shoulder part 4 facing a face plate pressure bonding surface 11.

(Alternatively, the protrusion 12 provided at the skin end of the shoulder portion 4 has a flat tip in FIG.

Next, in the case of crimping, a glass cylindrical tube is first inserted into the jig 10.

A protrusion 12 provided at the end of the shoulder portion 4 of the glass cylindrical tube 5
Then, the jig 13 comes into contact with the contact portion 9 and is fixed.

Next, indium 7 is placed on the shoulder portion face plate pressure bonding surface 11, and then the face plate 1 is placed on top of the other.

While maintaining the atmosphere around the indium 7 at a predetermined temperature, a predetermined pressing force is applied from above the face plate.

The crimping force acts in the crimping force direction 8 (face plate 1 - indium 7 - shoulder crimping surface 11 - shoulder 4 tube wall - protrusion 12 contact part 9 - jig 10), and The shoulder portion crimping surface 11 is crimped with indium interposed therebetween.

In this way, the pressing force is applied only to the protrusion 12 provided at the eyebrow end of the shoulder part 4, so the other parts of the shoulder part 4 are applied with the jig 1.
Since there is no contact with zero, the pressing force and reaction force become compressive forces.

Therefore, in the case of crimping, the shoulder portion 4 does not break.

As explained above, by providing a predetermined protrusion at the shoulder end of the shoulder portion of the glass cylindrical tube, the shoulder portion will not be destroyed even if a sufficiently large pressure is applied to the indium seal.
The productivity of the image pickup tube can be improved and an inexpensive image pickup tube can be obtained.

[Brief explanation of the drawing]

Figures 1a and l) are arrangement diagrams of the signal extraction terminals on the face plate, Figure 2 is a schematic diagram of a conventional image pickup tube, Figure 3 is a partially enlarged schematic diagram of a conventional crimping method, and Figures 4a and b are FIG. 2 is a partially enlarged schematic diagram of the crimping method according to the present invention. 1: Face plate, 4: Shoulder part, 5: 2/
3-inch glass cylindrical tube, 7: indium, 8: direction of crimping force, 9: contact section, 10: jig, 11: shoulder face plate crimping surface, 12: protrusion.

Claims (1)

[Scope of utility model registration request] It consists of a glass cylindrical tube 5 including an electron gun assembly 6 and a face plate 1 having a diameter larger than that of the glass cylindrical tube 5, and the glass cylindrical tube 5 has an enlarged diameter at the portion where it is crimped to the face plate 1. In a composite image pickup tube having a structure having a shoulder portion 4, the face plate 11 is crimped to the end of the shoulder portion layer that faces the shoulder portion face plate crimping surface 11 of the glass cylindrical tube 5 and coincides with the acting direction 8 of the crimping force. The image pickup tube is characterized in that the crimp receiver is provided with a protrusion 12 configured to make contact with a glass cylindrical tube fixing jig 10 serving as a stand only at this portion.