JPS61193343A - X-ray shield device - Google Patents

Abstract

PURPOSE:To make the working efficiency good and to obtain the sufficient effect of X-ray shield by carrying out the X-ray shield by means of an insulating sheet with an opening portion corresponding to an anode contact portion and an X-ray shield member. CONSTITUTION:An X-ray shield device is constituted by concentrically affixing X-ray shield members 24a, 24b consisting of annular lead tape to an annular insulating sheet 23, and an opening portion is provided corresponding to an anode contact portion 20. The X-ray shield device is formed in such a manner, and therefore when the opening portion 26 is affixed to correspond to the contact portion 20 of a CRT anode portion and an anode cap 22 is sticked to its, if insulating adhesives 25 is poured to an annular space 27, it is possible to effectively carry out the adhesion without uselessness in applying the adhesives 25. Further, it is possible to carry out the X-ray shield including the contact portion 20, and to complete the measure of the X-ray shield before mounting the cap 22.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an X-ray shielding device for a cathode ray tube anode portion of a projection type video projector.

BACKGROUND OF THE INVENTION In recent years, in projection type video projectors, in order to obtain a high-brightness screen, the voltage applied to the anode section (hereinafter referred to as anode section 4) of the cathode ray tube, that is, the anode voltage, has been increased. , cathode ray tube (hereinafter referred to as rcR)
(denoted as TJ), the amount of emitted X-rays increases, necessitating an X-ray seal 1z, and various X-ray shield pairs are provided.

The second example of such a conventional X-ray shield device
This will be explained using FIGS. In Figure 2, 1 is C
RT anode contact part, 2 is CRT two part, 3
is an anode cap, 4 is an X11 shield member made of lead tape, and 5 is an insulating adhesive such as silicon bond. The purpose is to block the

6 is a CRT face.

In the above X-ray shield device, the X-ray shield member 4
for pasting around the outside of the CRT. As mentioned above,
Since high voltage leakage occurred in the anode contact portion 1, the X-ray shield member 4 could not be attached, and the area around the anode cap 30 was not provided with an X-ray shield. While the anode voltage is still not very high, the conventional configuration can sufficiently reduce the amount of X-ray radiation below the specified value, and
This was an effective countermeasure because it was only necessary to attach an X-ray shield member 4 such as lead tape to the CRT, so the work could be easily carried out using a CR'T preparation tool.

However, as the anode voltage has become higher and higher due to the demand for high-brightness screens, the amount of X-rays emitted from the anode cap has increased, so that it has become impossible to keep it below the specified value with the above-mentioned conventional configuration.

Therefore, as shown in FIG. 3, an X-ray shielding case 7 is provided to enclose the anode cap 3 to shield the entire periphery of the CRT, or as shown in FIG.
A measure is taken to reduce the amount of X-ray radiation below a specified value by using an Xfi+shield device configured to house a CRT in a steel case 8. In Fig. 3, 9 is an anode lead, 10 is a CRT mounting bracket, 11.12 is a soldering part, and in Fig. 4, 13 is a part for the CRT neck part, and 14 is an anode main part. It is a shield iron cover.

16 Problems Solved by the Invention However, in the configurations shown in FIGS. 3 and 4 as described above, it is necessary to remove the anode cap 3 and then attach the X-ray shield device. Since the X-ray countermeasures cannot be completed in the preparation process and must be done in the assembly process, work efficiency is extremely low. Furthermore, in the method shown in Figure 3, the CRT is ■It is numerically inefficient, such as soldering after wrapping. On the other hand, with the configuration shown in Figure 2, X-ray countermeasures can be completed during the CRT preparation process, and workability is good, but the CRT
Since the measures against X-rays from the R-King anode section were incomplete, there was a problem in that sufficient measures against X-rays could not be taken.

The present invention solves the above-mentioned problems, and provides an X-ray shielding device that has good workability and can complete X-ray countermeasures with the CRT preparation T culm, and can sufficiently shield the anode part from X-rays. With the goal.゛Means for Solving the Problems In order to solve the above problems, the X-ray shielding device of the present invention includes an insulating plate having an opening corresponding to the anode contact portion of the cathode ray tube, and an insulating sheet pasted on the insulating sheet. The X-ray shield member is attached to the X-ray shield member. □
According to the configuration described above, even if the anode voltage becomes high,
Keep the amount of radiation below the specified value and
The work efficiency is extremely high because it is possible to complete the line i plan.

Example An embodiment of the present invention will be described below with reference to FIG.

FIG. 1A is a sectional view of an X-ray shield device according to an embodiment of the present invention attached to a CRT anode, FIG. 1B is a sectional view of the same X-ray shield device, and FIG. It is a top view of the state attached to 6R king. Figure 1 5
, 2o is an anode contact part, 21 is CRT=
22 is an anode cap, 23 is an insulating sheet made of silicon, etc., 24 is an X-ray shielding member made of, for example, lead tape, 25 is an insulating adhesive made of, for example, silicone bond, and 26 is an anode cap. The opening corresponding to the portion 20, 2γ is the annular interval fiJ28 is the CRT face. The X-ray shield device in this example is
As shown in B, X-ray shield parts t124a and 24b made of ring-shaped lead tape are attached concentrically to a ring-shaped insulating sheet 23, and the openings 26 are formed in the anodes 5 and 1 to 20. They are placed opposite each other.

Hereinafter, the effects in the above configuration will be explained.

Since the X-ray shield members 24a and 24b are attached to the insulating sheet 23 with an annular space 27 concentrically arranged, as shown in A, an opening is formed in the CRT anode part and in the anode contact part 20. Paste it so that it is compatible with 2G,
When bonding the anode cap 22, the annular space 21
By pouring the insulating adhesive 25 into the insulating sheet 230, the insulating adhesive 25 can be applied efficiently without waste, and the insulating adhesive 25 can prevent high pressure leaks as well as the difference in level of the insulating sheet 230. can be prevented. Furthermore, as shown in C, X-ray shielding can be achieved including the anode contact portion 20, and the X-ray shielding measures can be completed before the anode cap 22 is attached.

According to the present invention, the anode contact portion is shielded from X-rays by an insulating sheet having an opening corresponding to the anode contact portion and an X-ray shielding member such as lead tape. Therefore, the workability is good,
Moreover, it is possible to obtain a sufficient X-ray shielding effect.

[Brief explanation of drawings]

FIG. 1A is a sectional view of an X-ray shielding device according to an embodiment of the present invention attached to a CRT anode, FIG. 1B is a sectional view of the same X-ray shielding device, and FIG. 1C is a sectional view of the same X-ray shielding device. 2 is a schematic plan view of a CRT equipped with a conventional X-ray shield device, and FIG. 3A is a plan view of a CRT equipped with another conventional X-ray shield device.
7 - Figure B is a perspective view of the external appearance, and FIG. 4 is a perspective view of the external appearance of yet another conventional X-ray shield device. 20...Anode contact part, 23...Insulating sheet, 24, 24a, 24b-X-ray shielding member, 2
6-...Diapering Department Agent Yoshihiro MorimotoFigure 2Figure 3Figure 4

Claims (1)

[Scope of Claims] 1. An X-ray shielding device comprising an insulating sheet having an opening corresponding to an anode contact portion of a cathode ray tube, and an X-ray shielding member stuck on the insulating sheet. 2. The X-ray shielding device is composed of a pair of large and small annular lead tapes, which are arranged concentrically around the opening and with an annular space between them. X-ray shield device.