JPH0584017B2 - - Google Patents

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 video projector.

Conventional technology In recent years, in projection video projectors,
In order to obtain a high-brightness screen, the voltage applied to the anode section (hereinafter referred to as "anode section") of the cathode ray tube,
That is, the anode voltage has been increased, which increases the amount of X-rays emitted from cathode ray tubes (hereinafter referred to as "CRT"), necessitating X-ray shielding, and various X-ray shielding measures have been taken.
An example of such a conventional X-ray shield device will be described with reference to FIGS. 2 to 4. In Figure 2, 1 is the anode contact part of the CRT, and 2 is the anode contact part of the CRT.
CRT cone part, 3 is an anode cap, 4 is an X-ray shielding member made of lead tape, 5 is an insulating adhesive such as silicon bond, and this insulating adhesive 5 is an X-ray shielding member 4 of the CRT anode voltage.
This is to cut off high voltage leakage current to the 6 is a CRT face.

In the above-mentioned X-ray shield device, this is to attach the X-ray shield member 4 around the outside of the CRT. As mentioned above, since high voltage leakage occurs in the anode contact portion 1, the X-ray shield member 4 cannot be attached, and the area around the anode cap 3 is 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 shielding member 4 such as lead tape to the CRT, which made the work easier in the CRT preparation process. However, as the anode voltage has become higher and higher due to the demand for high-brightness screens, the amount of X-ray radiation from the anode cap has increased, so that it has become impossible to keep the voltage below the specified value with the above-mentioned conventional configuration.

Therefore, as shown in FIG. 3, an X-ray shield case 7 is provided to enclose the anode cap 3.
X-ray shielding equipment can be used to shield the entire area around the CRT, or to store three R, G, and B CRTs in the iron case 8 as shown in Figure 4.
Measures are being taken to keep the amount of radiation below the specified value. In Fig. 3, 9 is the anode lead, 10 is the CRT mounting bracket, 11 and 12 are the soldering parts, and in Fig. 4, 13 is the hole for the CRT neck, and 14 is the anode cap part X-ray shield iron cover. It is.

Problems to be Solved by the Invention However, in the configurations shown in FIGS. 3 and 4 as described above, it is necessary to attach the X-ray shield device after attaching the anode cap 3, so X-ray countermeasures must be taken during the CRT preparation process. cannot be completed and must be done during the assembly process, which greatly reduces work efficiency.Furthermore, in the method shown in Fig. 3, soldering is performed after the CRT is wrapped in the X-ray shielding member 4. Etc., efficiency is also reduced in terms of man-hours. On the other hand, with the configuration shown in Figure 2, X-ray countermeasures can be completed in the CRT preparation process, and workability is good, but the X-ray countermeasures from the CRT anode are incomplete, so sufficient X-ray countermeasures cannot be taken. The problem was that there was no

The present invention solves the above-mentioned problems.
Easy to work with, allowing X-ray countermeasures to be completed during the preparation process.
Another object of the present invention is to provide an X-ray shielding device that can sufficiently shield the anode portion from X-rays.

Means for Solving the Problems In order to solve the above-mentioned problems, the This configuration includes an X-ray shield member.

Effects According to the above configuration, even if the anode voltage increases, the amount of X-ray radiation can be suppressed below the specified value, and the CRT
Work efficiency is extremely high because X-ray countermeasures can be completed during the preparation stage.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIG.

Figure 1A is a cross-sectional view of an X-ray shield device according to an embodiment of the present invention attached to a CRT anode, Figure B is a cross-sectional view of the same X-ray shield device, and Figure C is a cross-sectional view of the same X-ray shield device. FIG. 3 is a plan view of a state in which the image is pasted on a CRT. In FIG. 1, 20 is an anode contact part, 21 is a CRT cone part, and 22
is an anode cap, 23 is an insulating sheet made of silicon, etc., and 24 is an X made of lead tape, for example.
A wire shield member, 25 is an insulating adhesive made of silicon bond, 26 is an opening corresponding to the anode contact portion 20, 27 is an annular spacer, 2
8 is a CRT face. X in this example
As shown in B, the radiation shielding device has X-ray shielding members 24a and 24b made of annular lead tape attached concentrically to an annular insulating sheet 23, and the opening 26 is located at the anode contact portion. 2
It is provided corresponding to 0.

Hereinafter, the effects of the above configuration will be explained. The X-ray shielding devices 24a and 24b are attached to the insulating sheet 23 with annular openings 27 concentrically arranged, so as shown in A, there are openings in the CRT anode part and in the anode contact part 20. 26 correspond to each other, and pour the insulating adhesive 25 into the annular space 27 when adhering the anode cap 22, the insulating adhesive 25 can be applied efficiently without waste. In addition, the insulating adhesive 25 can prevent the step of the insulating sheet 23 as well as high pressure leakage. Furthermore, as shown in C, the anode contact portion 20 can also be shielded from X-rays, and the X-ray shielding measures can be completed before the anode cap 22 is attached.

Effects of the Invention As described above, according to the present invention, the anode contact portion is X-ray shielded 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 and a sufficient X-ray shielding effect can be obtained.

[Brief explanation of the drawing]

Figure 1A is a cross-sectional view of an X-ray shield device according to an embodiment of the present invention attached to a CRT anode, Figure B is a cross-sectional view of the same X-ray shield device, and Figure C is a cross-sectional view of the same X-ray shield device. Figure 2 is a schematic plan view of a CRT equipped with a conventional X-ray shielding device, and Figure 3A is a side view of a CRT equipped with another conventional X-ray shielding device.
FIG. 4 is a perspective view of another conventional X-ray shield device. 20... Anode contact portion, 23... Insulating sheet, 24, 24a, 24b... X-ray shield member, 26... Opening portion.

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 arranged concentrically around the opening and with an annular space between them. X-ray shield device.