KR200198838Y1 - Assembly of inner frame and mask frame for cathode ray tube - Google Patents

Abstract

The inner shield, which is located inside the funnel of the cathode ray tube and is installed to protect the electron beam emitted from the electron gun from the external magnetic field, is installed on only one side by using a single plate to reduce the production cost compared to all four sides. And the assembly of the mask frame and inner shield for cathode ray tube to reduce the manufacturing maneuver.

The plate of the inner shield is provided only on one of the upper and lower sides of the mask frame.

Description

Assembly of inner frame and mask frame for cathode ray tube

1 is an exploded perspective view of the inner shield and the mask frame according to the present invention.

2 is a side cross-sectional view of a cathode ray tube in a state where a conventional inner shield is installed.

3 is a diagram for explaining a direction in which a geomagnetic field flows geomagnetically.

* Explanation of symbols for main parts of the drawings

20: mask frame 22: inner shield

[Industrial use]

The present invention relates to an inner shield for a cathode ray tube, and more particularly, to an assembly of a mask frame and an inner shield which can reduce production costs while efficiently blocking the geomagnetic field.

[Prior art]

The cathode ray tube deflects the electron beam from the electron gun up, down, left, and right to reproduce the image by drawing a raster on the screen.

As shown in FIG. 2, the colored cathode ray tube includes a panel 2 having a phosphor coated on an inner side thereof, a funnel 6 sealed to an opening of the panel, and having a deflection means 4 located on an outer side thereof; It is located at the rear end of the funnel and is shaped with a neck 10 in which an electron gun 8 for emitting an electron beam is embedded.

A stud pin is partially embedded in the skirt of the panel to partially support the mask frame 12. The mask frame 14 selects an electron beam so that the electron beam is landed on the phosphor. Is attached.

The mask frame is provided with an inner shield 16 which can be protected from the earth's magnetic field when the electron beam proceeds toward the fluorescent light at a position opposite to the shadow mask.

This inner seal serves as a means for preventing the electron beam from the electron gun from being affected by an external magnetic field (earth magnetic field) as it travels toward the fluorescent surface.

[Problems to Be Solved by the Invention]

However, since the inner seal installed in the cathode ray tube having the above structure has a shape in which the front and rear surfaces are open, four plates are formed on four sides of the top, bottom, left, and right sides, the fixing time is fixed when the mask frame is installed on the mask frame. There is a drawback to lengthening.

And, as can be seen from FIG. 3, in the northern hemisphere, the vertical component of the geomagnetic field acts from top to bottom, and in the southern hemisphere, the vertical component of the geomagnetic field acts from the bottom up, so in the northern hemisphere In the southern hemisphere, the inner shield plate is needed only on the upper side.

However, conventionally, since the plate is formed on all four sides, the production cost increases due to the use of unnecessary plates, and the time required to assemble the unnecessary plates is one of the factors that lowers the productivity.

[Means to solve the problem]

The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to use the inner shield plate efficiently improves workability and productivity, and a mask frame capable of efficient geomagnetic shielding and It is to provide an assembly of the inner shield.

In order to realize the object of the invention as described above, in the cathode ray tube which is located inside the funnel of the cathode ray tube and has an inner shield for protecting the electron beam emitted from the electron gun from the external magnetic field, said inner seal is Provided is an assembly of a mask frame and an inner shield for a cathode ray tube fixed to one of four sides of a mask frame in a single plate body.

In addition, any one of the four sides of the above provides an assembly of the mask frame and the inner shield for the cathode ray tube, characterized in that the upper side or the lower side of the mask frame.

EXAMPLE

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a perspective view of the assembly according to the present invention, the inner shield plate body 22 is fixed to the upper side or the lower side of the mask frame 20.

The inner shield plate 22 is fixed to the upper side of the mask frame in the case of a cathode ray tube used in the southern hemisphere, and the inner shield plate 22 is fixed to the lower side of the mask frame in the northern hemisphere. This is the case for cathode ray tubes used.

In the case of the geomagnetic northern hemisphere, as can be understood through FIG. 3, since the vertical component (BH) of the geomagnetic field is operated from the top to the bottom, the inner shield plate is installed at one lower side. Because you can protect from.

On the contrary, in the case of the geomagnetic southern hemisphere, since the vertical component (BH) of the geomagnetic field acts upward from the bottom, the geomagnetic field is installed at the top one to protect the electron beam from the geomagnetism crab.

As described above, the inner seal according to the present invention has four plates on the inner side, so that the earth magnetic field can be effectively blocked by using the plate on one side, so that the number of components is reduced by that amount. Since the assembly labor is reduced, the production cost can be lowered.

Inner shield is assembled to the mask frame is made through a separate krill, but this operation was performed on four sides in the past, but the present invention only needs to be performed on one side, so that the production speed will be faster, the assembly process There are additional effects that can be automated.

Claims (2)

In the cathode ray tube which is located inside the funnel of the cathode ray tube and has an inner shield for protecting the electron beam emitted from the electron gun from an external magnetic field, the inner shield 22 is formed of a single plate body and has a mask frame 20. An assembly of a mask frame and an inner shield for a cathode ray tube fixed to any one of four sides of the same. The assembly of a mask frame and an inner shield for a cathode ray tube according to claim 1, wherein any one of the four sides is an upper side or a lower side of the mask frame.