JPS6158145A - Mesh electrode support body for image pickup tube - Google Patents

Abstract

PURPOSE:To improve the positioning of a mesh electrode by providing a funnel- shaped tilt surface on the inner circumferential section of a glass bulb end face, positioning the outer circumferential edge of the mesh electrode on the face, and sealing a faceplate with an indium ring. CONSTITUTION:An image pickup tube is formed by providing a funnel-shaped tilt surface 10a on the inner circumferential section of the end face of a glass bulb 10, positioning four reed-type sections 14 that are protruded to the outer circumferential edge of the metal plate 12 of a mesh electrode 14 consisting of a mesh plate 11 and first and second ring-shaped metal plates 12 and 13 that insert the plate on the surface, making a spring 15 provided on the circumference of the metal plate touch a collimation electrode 7 on the inner surface of a bulb 10, and cold-crimping a faceplate 1 using the indium ring 5. As a result, the positioning of the mesh electrode 14 can accurately and stably be performed without the airtightness of the indium ring 5 and requiring complicated work.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a mesh electrode support structure for an image pickup tube, which is provided with a metal film electrode on the inner peripheral surface of a glass bulb to be connected to a mesh electrode.

Conventional Structure and Problems Conventionally, as shown in FIG. 1, a transparent conductive IIα2-gamma photoconductive film 3 is laminated on the inner surface of a face plate 1 made of a flat glass plate, and is surrounded by a hard metal ring 4. A collimation electrode 7 made of a metal film and a defleftron deflection electrode 8 are attached to the inner peripheral surface of the glass bulb 6 which hermetically seals the face plate 1 using the indium ring 6 as a sealing means, and is connected to the collimation electrode 7. An imaging tube in which the supporting end of a mesh electrode 9 to be used is embedded and fixed in an indium ring 6 is known.

In such an image pickup tube, not only can the indium ring 6 as an airtight sealing means also be used as a support means for the mesh electrode 9, but also the common connection terminal of the collimation electrode 7 and the mesh electrode 9 can be connected to the metal ring 4 through the indium ring 5. There are advantages that can be derived from this. Note that the terminal of the transparent conductive film 2 passes through the face plate 1 in an airtight manner and is led out onto the outer surface of the face plate 1.

However, in order to obtain complete electrical contact between the collimation electrode and the indium ring 6, it is necessary to extend the end 7a of the collimation electrode 7 to one end surface of the glass bulb 6.

On the other hand, since the collimation electrode 7 is usually made of a vacuum-deposited film made of chromium, nickel, or the like, the extension of the electrode 7 ensures airtightness at the cold-crimped surface between one end surface of the glass bulb 6 and the indium ring 6. There is a danger that it may be easily damaged.

Another problem is that when the supporting end of the mesh electrode 9 is embedded and fixed in the indium ring 6, the electrode tends to shift 2 from its center. As a countermeasure against this, the cross-sectional shape of the indium ring 6 before sealing is made stepped as shown in FIG.
It is conceivable to engage the stepped portion 5a of the indium ring 5, but it is not easy to perform such processing on the soft indium ring 5, and the workability becomes worse. It is also conceivable to provide a step 6a on the end face of the glass bulb 6 as shown in FIG. 3, and to engage the supporting end of the mesh electrode 9 with this step 6a. Not only is it difficult to process accurately, but the pressure contact between the collimation electrode 7 and the mesh electrode 9 is
There is a possibility that the indium ring 50 may become unstable due to elastic deterioration.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide a mesh electrode support structure that can support and fix a mesh electrode in a predetermined position without impairing the airtightness of the sealing part and without providing a step on the indium ring or glass bulb. Our goal is to provide the following.

Structure of the Invention According to the present invention, in an imaging tube in which a face plate (V-) is sealed by an indium ring to one end surface of a glass bulb having a metal film electrode on the inner peripheral surface, a funnel is provided on the inner peripheral surface side of the one end surface. It has a sloped surface portion of the shape. Then, the outer periphery of a mesh electrode equipped with metal springs that abuts the metal film electrode at three or more locations is positioned on the slope and brought into contact with the indium ring, as shown in the drawings below. This will be explained in detail along with examples.

DESCRIPTION OF THE EMBODIMENTS As shown in FIGS. 4 and 6, a glass bulb 10 has a face punch 1 hermetically sealed by cold crimping with an indium ring 6 interposed therebetween. On the surface side, a funnel-shaped inclined surface 10a formed by a surface and a surface is provided over the entire circumference.

First and second metal rings 12 are welded together by sandwiching the gauze-like thin metal plate 11 and its outer periphery.
．． The support end 14a at the outer peripheral edge of the mesh electrode 14 consisting of
a, and is pressed into contact with the indium ring 6 which has been deformed by cold crimping. However, the support end portion 14a is composed of four tongue-shaped portions formed protruding from the outer peripheral edge of the first metal ring 12. Further, a plurality of metal springs 16 are provided on the outer peripheral edge of the second metal ring 13, and the tongue-shaped tip edge of the spring 15 is connected to a collimation electrode attached to the inner peripheral surface of the glass bulb 1o. Pressure contact is made at three or more places.

For this reason, the mesh electrode 14 does not shift its position (center shift) even during cold-press sealing using the indium ring 5, and after sealing, the mesh electrode 14 is pressed against the indium ring 5 as shown in FIG. Then, according to the prescribed method, Kohiro Sadaori, -
1-≠) dl, collimation electrode 7, indium ring 6
and electrically connects with the metal ring 4. In addition, the surface and 9
The inclined surface 10a can be formed relatively easily by simply chamfering the conventional polishing process to a slightly deeper depth. Moreover, the collimation electrode 7 may be another metal film electrode. Furthermore, the annular outer peripheral edge of the mesh electrode 140 may be positioned on the inclined surface IQa without forming the tongue-shaped support end 14a. Furthermore, the funnel-shaped inclined surface IQa may be obtained by deforming the opening edge of the glass bulb 10 and applying glazing, and this embodiment is shown in FIG.

Effects of the Invention Since the present invention is constructed as described above, the mesh electrode can be fabricated without impairing the airtightness of the cold crimped surface of the indium ring, and without performing complicated processing on the indium ring or the end face of the glass bulb. can be stably and reliably supported in a predetermined position, and the common terminal of the metal film electrode such as the collimation electrode and the mesh electrode can be led out of the tube in an airtight manner.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of the head of a conventional image pickup tube, FIGS. 2 and 3 are side sectional views of a portion of an image pickup tube with a stepped portion on the end face of an indium ring or glass bulb, and FIG. 6 are a side sectional view and a cross sectional view of the essential parts of an image pickup tube in which the present invention is implemented, and FIG. 6 is a side sectional view of the essential parts of another embodiment of the present invention. 1...Face plate, 6...Indium ring, End...Co-IJmation pole, 10
...Glass Pal, 7", 10a...Funnel-shaped inclined surface of the same bulb, 14...Mesh electrode, 15...Spring. Name of agent: Patent attorney Toshio Nakao and 1 other person
4 Figure 6 Figure 1

Claims (1)

[Claims] In an imaging tube in which a face plate is sealed with an indium ring to one end surface of a glass bulb having a metal film electrode on the inner peripheral surface, a funnel-shaped inclined surface is provided on the inner peripheral surface side of the one end surface, and the metal 1. A mesh electrode support structure for an image pickup tube, characterized in that the outer peripheral edge of a mesh electrode is provided with metal springs that contact the membrane electrode at three or more locations and is positioned on the inclined surface and in contact with the indium ring.