JPS6074334A - Image tube - Google Patents

Abstract

PURPOSE:To simplify assembling without degrading dielectric strength characteristics by forming two or more conductive films on an insulating film formed on the same carrier and obtaining an electrode. CONSTITUTION:The same carrier 1 is arranged at the inner part of a vacuum enclosure 4. This carrier 1 is uneven and selects insulating bodies, semiconductors, and conductors with good processability, heat resistance, and vacuum resistance, and an insulating film 2 is formed on the inner surface. For example, three conductive films 3 are formed on this insulatng film 2 and the conductive films 3 and the insulating film 2 are formed by a method such as deposition, sputtering, electrolysis, coating, flame spraying, and so on, for instance. In addition, the conductive films 3 are accurately positioned by masking or so. When voltage is applied to these conductive films 3, respectively, each section changes into an electrode and can form an electronic lens system. Furthermore, an input surface 5 and an input window 7 are arranged at the input side of the vacuum enclosure 4 and an output surface is arranged at the output side, respectively.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to an image tube having a plurality of electrodes therein.
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[Background of the rise of the invention]

Generally, the number of electrodes in an image tube tends to increase in order to change the field of view or improve imaging performance. However, in normal cases, independent members are used for the electrodes, so as the number of electrodes increases, electrode position adjustment becomes more difficult during image tube manufacturing. In order to solve this problem, the following methods have been proposed. That is, by forming a 4'R film on the same carrier made of an insulator,
This involves creating an electrode system.

According to this method, %4"JA consisting of a plurality of electrodes
Place the system outside the image tube container at a point between the electrodes.
Since the fi adjustment can be completed, the electrode position adjustment process during image tube assembly can be significantly shortened.

[Problems with background technology]

The method of creating an electrode system by I&M (I&M) a conductive film on the same carrier made of an insulator was introduced in 1971-12.
However, it has the following problems.

That is, creeping discharge or the like occurs on the surface of the insulator between the conductive films forming the electrode, and the withstand voltage characteristics deteriorate.

[Purpose of the invention]

An object of the present invention is to provide an image tube that is easy to assemble without reducing its withstand voltage characteristics.

[Summary of the invention]

This invention provides an image tube in which an insulating film is formed on the same carrier, and a plurality of conductive films are formed on this insulating film to serve as electrodes.

[Embodiments of the invention]

The image tube of this invention is constructed as shown in FIG.
Inside the vacuum envelope 4, identical carriers 1 are arranged along the side walls. This carrier 1 has irregularities, and any material such as an insulator, semiconductor, or conductor can be selected as long as it has good workability, heat resistance, and true shrinkage resistance, and lightweight materials can also be used. An insulating film 2 is formed on the inner surface of such a carrier 1. On this insulating film 2, a plurality of, for example, three, conductive films 3 are formed. This conductive film 3 and the insulating film 2
is formed by, for example, vapor deposition, sputtering, electrolysis, paint, thermal spraying, or other methods. Further, the conductive film 3 is accurately positioned by masking or the like. By applying a voltage to each of the conductive films 3, each part becomes an electrode, and the electron lens system can be destroyed. Furthermore, an input surface and an exit surface are provided on the input side and the output side of the vacuum envelope 4, respectively. In the figure, 7 is an input window.

In the above case, by making the carrier 1 from a light absorbing material and forming a light escape film, it is possible to prevent internal distortion and improve the contrast of the image tube.
It can also be realized by forming the conductive film 3 from a transparent film or from a light absorbing material.

〔Effect of the invention〕

According to this invention, the following excellent effects can be obtained.

(1) Incorporating the electrode system into the tube 1 is lr, υ) "1
I can do 15.

(2) The withstand voltage characteristics can be improved.

(3) By using a ladle that absorbs light, 1'+'
11 Jl contrast image tubes are installed.

(4) Since the carrier 1 may be an insulator, a conductor, or a semiconductor, a material that is easy to work with and is lightweight can be selected. As a result, the weight of the image tube can be reduced.

(5) When the carrier 1 is made of ceramic, the bonding strength between the carrier 1 and the deposited film is high.

[Modified example of the invention]

FIGS. 2 to 4 show modified examples of the present invention, which provide the same effects as the above embodiments.

That is, in the case of Fig. 2, the carrier 1 constituting the electrode system is made of a material with high strength and sufficient vacuum tightness, which has advantages such as eliminating the need for a heavy tube and reducing the weight, and reducing the number of parts. can get.

Further, in the case of FIG. 3, the carrier 1 divided into three parts is integrated by a screwing method, and 8 is the screwed part. The above effects can also be obtained when the carrier 1 is made up of a plurality of parts.

Further, even if a material that absorbs light is used only in the portion of the carrier 1 near the input surface, it is also effective in improving the contrast. In addition, the above effects may be further enhanced by selecting appropriate material components for the insulation 1, 11Q3, and carrier 1 depending on the location. For example, an insulating film with less voltage resistance is used for parts that are exposed to crystal pressure than parts that are not exposed to such pressure. Also, adhering different Okegawa insulating films one after the other has Z11 effects on electrical resistance properties.

Furthermore, as shown in FIG. 4, in the case where there is one layer per carrier 1, the insulating film 4 is the same as the substrate 2 and I'j4i q9).
Even if it is formed only between 2 and 2, it has an effect on the pressure property of 1luJ'.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an image tube according to an embodiment of the present invention, and FIGS. 2 to 4 are sectional views showing modified examples of the invention. 1...-Carrier, 2... Insulating film, 3... Specialized film, 4
...Vacuum envelope, 5...Input side, 6...Output side,
7...Input window, 8...Screwed part. Figure 1 Figure 2 Figure 3 Figure 4N

Claims (3)

[Claims] (1) Arranging the same carrier in a vacuum envelope, forming an insulating film on the inner surface of the carrier, further forming a plurality of conductive films on the insulating film, and defining the conductive films as electrodes. An image tube characterized by: (2) The carrier is a part of the vacuum envelope. f. An image tube according to claim 1. (3) The image tube according to claim 1, wherein the carrier is a plurality of carriers integrated by screwing.