JP2507405B2 - Image tube - Google Patents

Description

The present invention relates to an image tube, and more particularly to improvement of insulation of a high voltage electrode and extraction structure of a high voltage lead wire of the image tube.

(Prior Art) Generally, in the field of image tubes, in order to improve the contrast ratio, which is one of the most important factors in evaluating image quality, an image tube manufactured by a certain company in the United States, for example, as shown in FIG. There is. In this image tube, the output fluorescent screen 2 is formed directly on the inner surface of the glass substrate 13, and the rear open end of the vacuum envelope 4 is sealed with a metal tubular body 3 to attach the metal tubular body 3 thereto. The silicon member 19 is molded and insulated.

(Problems to be Solved by the Invention) In the conventional image tube as described above, when the voltage applied to the anode 15 is equal to or higher than the dielectric withstand voltage of silicon, dielectric breakdown is likely to occur. Further, since silicon is not so excellent in moisture resistance, if it is continuously exposed to a high temperature state, the leak current increases and finally dielectric breakdown occurs. Furthermore, since the high-voltage lead wire 7 is directly pulled out from the silicon member 19, when a strong force is applied to the high-voltage lead wire 7, a crack is generated at the interface between the high-voltage lead wire 7 and the silicon member 19 and dielectric breakdown occurs. It will be easier.

It is an object of the present invention to solve the above problems and provide an image tube having stable insulating characteristics.

[Structure of the Invention] (Means for Solving the Problems) According to the present invention, a substrate having an output phosphor screen is sealed at an end portion of a vacuum envelope via a metal tubular body to form a metal tubular shape. In an image tube in which the outer peripheral surface of the body is covered with an insulating member and a high-voltage lead wire that penetrates this insulating member and is electrically connected to the output fluorescent screen is provided, the insulating member covers the metal cylindrical body. An image tube including a resin molding material and a tubular cover made of an insulating material that covers the resin molding material, and the tubular cover is provided with a lead wire reinforcing portion for reinforcing mechanical fixation of the high voltage lead wire. Is.

(Operation) According to the present invention, excellent insulation characteristics are obtained, and the high-voltage lead wire is firmly fixed to prevent peeling due to external force. As a result, cracks do not occur and dielectric breakdown is prevented in advance. You can do it.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

The image tube of the present invention is constructed as shown in FIG. 1, and the same parts as those in the conventional example are designated by the same reference numerals.

That is, 11 is a cylindrical tube container having an opening 11a at the rear, an image tube 14 is housed inside, and a lens mounting base 12 is fixed to the opening 11a.
In such a tube container 11, as described above, the image tube 14
4 is a cylindrical vacuum envelope having an input window 1 on the input side, and an open end is formed on the output side of the vacuum envelope 4, that is, on the rear side. At this open end,
A glass substrate 13 having an output phosphor screen 2 formed on the inner surface side is sealed. In this sealing, the metal tubular body 3
However, the metal tubular body 3 has an anode 15
Is fixed, and high-voltage lead wire 7 that supplies high voltage to the outer circumference
Is connected. Therefore, the anode 15 is electrically connected to the high voltage lead wire 7 through the metal tubular body 3.

Although not shown, the input window 1 is provided in the vacuum envelope 4.
The input surface is disposed so as to face with, and the focusing electrode is provided along the side wall in the vacuum envelope 4.

Further, an annular bolt holding plate 10 is fixed to the outer periphery of the rear part of the vacuum envelope 4 by an adhesive agent 16.
A plurality of optical adjusting bolts 9 are provided so as to penetrate the lens mounting base 12 so as to project therefrom. Although not shown, nuts are screwed onto the optical adjustment bolts 9 so as to sandwich the lens mounting base 12 in contact with both surfaces of the lens mounting base 12, and the nuts on the outside are operated. Thus, the optical axis alignment and parallelism between the lens mounting base 12 and the output image of the image tube 14 are adjusted.

Further, in the present invention, the metallic cylindrical body 3 is covered with two or more insulating members. In this case, one of the two or more insulating members is the cover 5. The cover 5 has a substantially cylindrical shape, one end of which is in contact with the rear portion of the vacuum envelope 4 and the other end of which is bent and is in contact with the substrate 13. Such a cover 5
A mold material 6 which is one of two or more insulating members is provided in the gap between the metal tubular body 3 and the metal tubular body 3 by coating, fusing, filling, bonding, or the like.

As described above, the cover 5 and the molding material 6 are made of an insulating member, and the insulating member has high volume resistivity and high withstand voltage, and has weather resistance (heat resistance, humidity resistance, ozone resistance, radiation resistance,
Water resistance, chemical resistance, impact resistance, etc.) such as glass, silicon, ceramics, epoxy resin, insulating oil, fluorine resin, vinyl chloride, acrylic resin, polyimide resin, polyethylene resin, polypropylene resin, nylon resin, melamine resin , Phenol resin, etc.

Further, in the present invention, the cover 5 is provided with the lead wire reinforcing portion 8 for fixing the high voltage lead wire 7 connected to the metal tubular body 3.

(Modification) FIGS. 2 to 6 show modifications of the present invention, and the same effects as those of the above embodiment can be obtained.

First, in the case of FIG. 2, the bolt holding plate 10 in the above-mentioned embodiment is deleted, and instead, the input side end of the cover 5 is extended and bent to integrally form the flare portion 5a, and this flare portion 5a is formed. The optical adjustment bolt 9 is attached, and the cover 5 and the bolt holding plate 10 in the above embodiment are integrated. Of course, the cover 5 and the bolt holding plate 10 may be joined without being integrated.

According to this modification, since the bolt holding plate 10 which is conventionally arranged separately is integrated with the cover 5, optical adjustment and insulating molding can be performed at the same time, and fine adjustment can be easily performed after molding. As a result, the workability is greatly improved.

Next, in the modified example of FIG. 3, the bolt holding plate 10 and the optical adjustment bolt 9 in the above embodiment are deleted, and instead the output side end of the cover 5 is extended and bent to integrally form the flare portion 5b. The lens mounting base 12 is directly fixed to the flare portion 5b. When fixing, use an adhesive,
Bolting and fusion may be considered. The flare part 5b
May be extended to serve as the lens mounting base 12. The cover 5 and the lens mounting base 12 are integrated.

According to this modified example, the optical adjustment and the insulating molding can be performed at the same time as in the above modified example, and the workability can be significantly improved.

Next, in the modification of FIG. 4, an insulating member 17 capable of compensating for the inferior characteristics of the molding material 6 is applied, spray-welded on the surfaces of the molding material 6 and the high voltage lead wire 7,
It is formed by molding, vapor deposition, or the like.

According to this modification, the shape of the molding material 6 can be easily changed, and even the insulating member which is difficult to solidify into the shape of the cover 5 of the above-described embodiment can cover the molding material 6 by the above method. It is possible.

Next, in the modification of FIG. 5, the shape of the cover 18 is changed to the substrate 13
Or a shape that exactly matches the metallic cylindrical body 3, and by filling the cover 18 with a molding material 6 such as epoxy resin or silicon resin, the cover 18 is bonded to the substrate 13 or the metallic cylindrical body 3. In close contact.

According to this modification, the amount of the insulating member forming the molding material 6 is small, and the workability is improved.

[Advantages of the Invention] According to the present invention, excellent insulation characteristics are obtained, the high-voltage lead wire is firmly fixed, and peeling due to external force is prevented. As a result, cracks do not occur and dielectric breakdown is prevented. Can be prevented.

[Brief description of drawings]

1 is a sectional view showing an image tube according to an embodiment of the present invention, FIGS. 2 to 5 are sectional views showing modified examples of the present invention, and FIG. 6 is a sectional view showing a conventional image tube. It is a figure. 2 ... Output phosphor screen, 3 ... Metal cylindrical body, 4 ... Vacuum envelope, 5 ... Cover, 6 ... Mold material, 7 ... High-voltage lead wire, 8 ... Lead wire reinforcing portion, 9 ... Optical adjustment bolt, 10 ... Bolt holding plate, 11 ... Tube container, 12 ... Lens mounting base, 13 ... Board, 14 ... Image tube, 15 ... Anode.

Claims (1)

(57) [Claims] 1. A substrate having an output phosphor screen is sealed to an end of a vacuum envelope via a metal tubular body, and an outer peripheral surface of the metal tubular body is covered with an insulating member and the insulation is provided. In an image tube provided with a high-voltage lead wire that penetrates through the member and is electrically connected to the output phosphor screen, the insulating member covers a resin molding material that covers the metal tubular body and the resin molding material. An image tube, comprising: a tubular cover made of an insulating material, wherein the tubular cover is provided with a lead wire reinforcing portion for reinforcing mechanical fixation of the high voltage lead wire.