JPH0219997Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cathode ray tube display shielding device suitable for application to, for example, a cathode ray tube display for a computer.

Background Art and Its Problems For example, a cathode ray tube display for a computer handles a high frequency signal of about 50 MHz. Therefore, this display generates unnecessary radiation and causes electromagnetic interference (EMI) to other devices. As a measure to prevent this, a shielding device as shown in FIG. 1 has been proposed.

In the figure, 1 is a cathode ray tube, 2 is a network board, and 3 is a socket for the cathode ray tube. The substrate 2 includes a signal system circuit. This substrate 2 is fixed to one end of a cylindrical plastic member 4, and the other end of this member 4 is fixed onto the neck of the cathode ray tube 1 using a band 5. Further, 6 and 7 are a main body portion and a lid portion, respectively, which constitute the shield case 8, and are arranged so as to cover the above-mentioned substrate 2. In this case, the main body 6 is soldered 9 to a predetermined portion of the board 2.
It is fixed by being Note that the mounting surface of the substrate 2 is arranged to be on the opposite side from the lid section 7 side.

In the case of the shield device shown in Fig. 1, the network board 2 includes a signal system circuit, and the shield case 8 is arranged to cover this, so it is effective against unnecessary radiation generated from the signal system circuit. , can prevent electromagnetic interference to other equipment.

However, in the shield device shown in FIG. 1, during service, it is necessary to remove the solder 9 and the band 5, and then remove the board 2 for repair, which is troublesome.
In addition, there is no problem when printing in black and white, but when printing in color, the signal system circuit is large, that is, the board 2 is large and heavy, making it unstable to fix to the neck, causing the board to dislodge, and there is a risk of cracking the neck. It was hot.

Purpose of the invention The present invention was made in view of these points, and is designed to facilitate board repair during service, and to eliminate the risk of the board becoming dislodged or cracking, even in the case of a collar. It is.

Summary of the invention In order to achieve the above-mentioned purpose, the present invention is designed to provide a shield consisting of a main body and a lid so as to surround a network board fixed to the network of a cathode ray tube and a signal system board disposed near the network board. A case is provided,
The signal system board is detachably fixed to the main body, and the main body is fixed to the chassis.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIG. In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals.

In the figure, 10 is a network board fixed to the network of the cathode ray tube 1, and 11 is a signal system board. The signal system board 11 is arranged near the periphery of the network board 10. Further, 12 is a lead wire for supplying red, green, and blue signals from the signal system board 11 to the network board 10, for example. In this case, the lead wires may be ordinary ones, and it is preferable that the lead wires for the red, green, and blue signals have the same length.

In addition, 13 and 14 are the shield case 1, respectively.
These are the main body portion and lid portion of No. 5. The main body part 13 has a box-like shape as a whole, and has an opening 16 formed in the bottom thereof through which the cathode ray tube 1 is inserted. The main body part 13 is fixed to the chassis 17 of the cathode ray tube display by welding, soldering, screwing, etc. to the chassis 17 of the cathode ray tube display.

Further, on the bottom of the main body 13 of the shield case 15, for example, a plastic holder 18 is provided.
is planted. Then, the signal system board 11 mentioned above
is detachably fixed to this holder 18.
As this fixing method, for example, screwing or the like can be considered. In the example shown in FIG. 2, it is screwed.

In addition, in FIG. 2, the printed surface of the network board 10 faces toward the lid 14 of the shield case 15, while the mounting surface of the signal system board 11 faces toward the lid 14. Ru.

FIG. 3 is a schematic perspective view showing the positional relationship among the cathode ray tube 1, chassis 17, network board 10, and signal system board 11 in FIG.

This example is configured as described above, and includes the signal system board 11,
Since the shield case 15 is disposed to cover the lead wire 12, unnecessary radiation generated from the signal circuit is well shielded by the shield case 15, and electromagnetic interference to other equipment can be prevented. In addition, the signal system board 11 is mounted in a shield case 15.
Since it is removably fixed to the main body part 13 (holder 18), the board 11 can be easily removed and repaired during service. In addition, since the network board 10 and the signal system board 11 are provided separately, the network board 10 can be made small even when using a color system, so there is no need to apply excessive force to the network, and there is no need to worry about the board coming off or cracking the network. There is no. Furthermore, since the mounting surface of the signal system board 11 faces toward the lid 14 side of the shield case 15, it is easy to connect the signal system circuit to a connector, for example.

In addition, in the above-mentioned embodiment, the signal system board 11 is
Although it is designed to surround the network board 10, its shape is not limited to this, and in short, it may be placed near the network board 10.

Effects of the Invention According to the present invention described above, since the signal system board is detachably fixed to the main body of the shield case, it is easy to remove the board during service and repair it. Furthermore, since the network board and the signal system board are provided separately, the network board can be made small even in the case of a color system, so that no excessive force is applied to the network, and there is no need to worry about board displacement or cracking of the network.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part showing an example of a conventional shield device, FIG. 2 is a cross-sectional view of a main part showing an embodiment of the present invention, and FIG. 3 is a schematic perspective view thereof. 1 is a cathode ray tube, 10 is a network board, 11 is a signal system board, 15 is a shield case, and 17 is a chassis.

Claims (1)

[Scope of utility model registration request] A shield case consisting of a main body and a lid is provided to surround a network board fixed to the network of the cathode ray tube and a signal system board disposed near the network board, and the signal system board is connected to the main body. A shielding device for a cathode ray tube display, the main body being detachably fixed to a chassis.