KR20000011905U - Support structure and removal device of shadow mask assembly for color cathode ray tube - Google Patents

Abstract

The present invention relates to a color cathode ray tube, which is one of the image display apparatuses, and has an object to improve the regeneration efficiency of the shadow mask assembly by allowing the base plate mounted on the support structure of the shadow mask assembly to be easily removed. .

In order to realize this, the present invention is fixed to protrude one side of the base plate, the removal device of the base plate; A holder portion for supporting the spring on which the base plate is mounted in a tube axis direction; A drive unit for removing the base plate by applying a force in a tube axis direction; And a control unit for controlling the respective units.

Accordingly, there is an advantage that the circular preservation of the assembly for reuse can be minimized by minimizing the impact delivered to the shadow mask assembly upon removal of the base plate.

Description

Support structure and removal device of shadow mask assembly for color cathode ray tube

The present invention relates to a support structure of a shadow mask assembly and a removal device thereof in a color cathode ray tube, which is one of the image display apparatuses, and more particularly, so that a plate located between the springs coupled with the study pins of the panel can be easily removed. To facilitate the regeneration of the mask assembly.

In general, a cathode ray tube is a kind of image display device applied to a television receiver and a monitor, and the electron beam emitted from the electron gun moves at a constant velocity and passes through a shadow mask, which is a color-selective electrode, to form a predetermined pattern on the inner surface of the screen. By hitting the phosphor surface formed by the light emitting the phosphor to implement the image.

In other words, the color receiver tube of the television receiver is provided with a substantially rectangular phosphor screen including a three-color phosphor layer having a dot shape or a stripe shape emitting blue, green, and red light. In addition, the shadow mask is welded to the frame to form a single assembly while maintaining a constant distance to face the phosphor screen.

In addition, the frame supporting the shadow mask is supported on the panel by three or four support portions, and has a base plate at at least one shadow mask assembly support portion, and the base plate is welded to the frame. It is interposed between the spring and the stud pin formed in the panel and welded.

1 to 4 will be described as an example of a colored cathode ray tube according to the prior art.

In general, the color cathode ray tube is mounted on the front side of the cathode ray tube, and the inner surface of the cathode ray tube is fused with frit glass on the inner side and the panel 2 coated with red, blue, and green phosphors 1 on the inner side. A funnel 3 which forms a vacuum, a deflection yoke 7 mounted to the rear end of the funnel 3, and a neck 4 of the funnel 3 are enclosed and fired the electron beam 6 by input of an image signal. An electron gun 5, a frame 8 coupled by a stud pin 10 and a spring 11 formed on the inner side of each side of the panel 2, and supported by the frame 8, A circular thin hole serving as a shadow mask 9 was formed.

In addition, three of the four springs 11 coupled to the side of the frame 8 are directly coupled to the stud pins 10, and the other one is a vibration damping between the stud pins 10 and the springs 11 of the panel. As the base plate 12 of the ash is welded, the coupling state of the base plate 12 is illustrated in FIGS. 3 and 4.

In the medium and large cathode ray tube, four springs 11 are generally used because of the weight of the shadow mask assembly, and one of the springs has three springs with the inner surface of the panel and the curved surface of the color selection electrode being kept at a predetermined interval. More firmly supports the plane, which is determined by the panel, so that the panel and the shadow mask assembly are a complete pair.

In this structure, the plane consisting of the center of the hole of the three springs and the plane consisting of the stud pin center of the corresponding panel are coincident with each other.

However, the center of the hole formed in the other spring and the corresponding stud pin becomes extremely difficult to exist on the plane.

Therefore, the coupling hole 11a of the spring 11 coupled with the stud pin 10 of the panel has a larger diameter than the corresponding stud pin, and the stud corresponding to the base plate 12 welded to one of them. Holes 12a having the same diameter as the pins were formed.

The base plate 12 is inserted between the stud pins 10 and the springs 11 and the shadow mask 9 is coupled to a predetermined position, and then the metal plate 12 and the springs 11 are welded to form the shadow mask. It is possible to maintain a plane consisting of three spring hole centers without twisting.

During the manufacturing process of the cathode ray tube according to the prior art described above, a number of defects occur. In this case, it is difficult for the paired panel-shadow mask assembly to be regenerated at the same time. After removing the base plate that has been welded to the shadow mask assembly, the shadowmask assembly can be re-welded to the new panel to enable reuse.

In the conventional method of removing the base plate for this regeneration, a method of removing the base plate by using a lever-shaped tool or manually hitting the side protrusion of the spring with a hammer has been used.

However, the method of removing the base plate according to the prior art has a problem in that the spring is deformed when a lever lever is used, and in the manual hitting method, a deformation of the shadow mask surface occurs due to the spring bending or impact. As a result, the shadow mask may be displaced, resulting in a relatively poor quality of the newly formed color cathode ray tube.

The present invention is designed to solve the problems of the prior art as described above, by providing a coupling structure and a removal device to facilitate the operation during the removal of the base plate for using the shadow mask assembly, shadow mask The purpose is to allow removal of the base plate while no deformation of the assembly occurs.

1 is an internal configuration diagram of a typical color cathode ray tube.

Figure 2 is a plan view showing the configuration of a typical shadow mask assembly.

Figure 3 is a side view showing the configuration of the shadow mask assembly.

Figure 4 is a view showing a coupling state of the spring and the base plate according to the prior art.

5 is a coupling state of the spring and the base plate according to the present invention.

Figure 6 is a block diagram of the base plate removal apparatus according to an embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

8: frame 9: shadow mask

11: spring 20: table

22: base plate 23: control unit

24: holder portion 25: drive portion

25 ': Strike

Technical means of the present invention for achieving the above object is a mask assembly support structure of the color cathode ray tube fixed to the base plate to at least one spring of the support spring coupled to each side of the shadow mask assembly that is a color-selective electrode In

The base plate is characterized in that one side is fixed to protrude in the tube axis direction of the spring.

Preferably, the base plate is characterized in that the other side of the protruding portion is fixed to the inner position of the spring.

And as the removal device of the base plate fixed as described above,

(1) a holder portion for supporting the spring on which the base plate is mounted in a tube axis direction;

(2) a drive unit for removing by applying a force in the tube axis direction to the base plate; And

(3) It characterized in that it comprises a control unit for controlling each unit.

In this configuration, the spring and the shadow mask of the spring plate and the shadow mask are formed by hitting the protrusion of the base plate fixed to the spring by the control of the control unit while the spring is supported and fixed to absorb the shock transmitted from the holder of the base plate removing device. It can be seen that the base plate can be removed without deformation of the surface.

As a result, when other defects other than defects of the mask assembly itself occur, the base plate can be easily removed, thereby increasing the regeneration efficiency of the shadow mask assembly.

And, there may be a plurality of embodiments of the present invention, hereinafter will be described in detail with respect to the most preferred embodiment.

This preferred embodiment enables a better understanding of the objects, features and effects of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the base plate coupling structure and its removal device according to the present invention.

In addition, in drawing used for description (FIGS. 5 and 6), the same code | symbol is attached | subjected about the component same as a prior art, and the overlapping description may be abbreviate | omitted.

The coupling structure of the base plate 22 according to the present embodiment is projected a certain amount (a) in the tube axis direction on one of the four springs 11 coupled to the side of the frame 8, as shown in FIG. The opposite side is welded so as to be located inside a certain amount (b) than the end of the spring, the size (a, b) is usually positioned to be larger than 0.5 ~ 1mm, the welding point size of the base plate 22 and the spring (11) .

And when hitting the projecting portion for the purpose of removing the base plate 22 in the state that the spring 11 is not supported, as described in the conventional problem, the deformation of the curved surface of the spring 11 and the shadow mask 9 It may be generated. A removal device to compensate for this is shown in FIG. 5.

The base plate removal apparatus according to the embodiment of the present invention is the holder portion 24 for fixing or supporting the spring 11 at the upper and lower surfaces of the tube axis direction, and the tube plate direction welded to the base plate 22 welded to the spring 11. A drive unit 25 such as a pneumatic or cam drive that applies a force, a blower 25 'that strikes the protrusion of the base plate 22 by the drive thereof, and a controller 23 that controls the overall operation of the removal device. It consists of.

Reference numeral 20 in the drawing represents a table on which the mask assembly can be placed.

As described above, the operation of the present invention will be described below to remove the base plate by other defects than the defect of the shadow mask assembly itself during the cathode ray tube manufacturing process while the base plate 22 is coupled to the spring 11. Let's look at it.

First, the shadow mask assembly is placed on the table 20 of the device of the present invention, and the holder part 24 fixes the upper and lower parts of the spring 11 by the control of the controller 23. Then, in the driving portion 25 in the projecting direction of the base plate 22, the striking portion 25 'is raised by pneumatic or other driving force to strike the projection of the base plate 22 welded to the spring 11. This causes the base plate 22 to be removed from the spring 11.

At this time, the transmitted force is not transferred to the spring 11 and the shadow mask 9, but is absorbed by the holder part 24 fixed to the body of the removal device so that the shadow mask assembly is removed before the base plate 22 is removed. The same quality can be maintained.

When the base plate 22 is removed by such an operation, the base plate 22 may be used again to construct the cathode ray tube by welding another base plate to the spring 11 of the shadow mask assembly.

On the other hand, in the prior art, that is, in the prior art, when the operator attempts to remove the base plate manually by other defects during the manufacturing process, the impact is transmitted to the shadow mask assembly, and thus the present invention provides a shadow mask. It is possible to increase the circular preservation of the shadow mask assembly by facilitating the removal of the base plate while minimizing the impact delivered to the assembly.

In this result, according to the present invention it can be seen that it is possible to reduce the manufacturing cost of the product by improving the regeneration efficiency of the shadow mask assembly which is the main component of the color cathode ray tube.

In addition, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the present invention may be variously modified and implemented by those skilled in the art, such as the shape of the base plate or the direction of the protrusion.

Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the appended claims of the present invention.

As described above, the structure and apparatus of the present invention facilitate the removal of the base plate welded to the spring and minimize the transmission of the impact to the shadow mask assembly, thereby degrading the shadow mask assembly itself in the manufacturing process of the color cathode ray tube. If other defects are generated, there is an effect of removing only the base plate and regenerating the shadow mask assembly.

Claims (4)

In the mask assembly support structure of the color cathode ray tube in which the base plate is fixed to at least one of the support springs coupled to each side of the shadow mask assembly, which is a color-selective electrode, The base plate is a support structure of the shadow mask assembly for the color cathode ray tube, characterized in that one side is fixed to protrude in the tube axis direction of the spring. The method of claim 1, The base plate is the support structure of the shadow mask assembly for a color cathode ray tube, characterized in that the other side of the protruding portion is located inside the spring end. An apparatus for removing a base plate fixed to at least one of the support springs coupled to each side of the shadowmask assembly, which is a color-selective electrode, (1) a holder portion for supporting the spring on which the base plate is mounted in a tube axis direction; (2) a drive unit for removing by applying a force in the tube axis direction to the base plate; And (3) The apparatus for removing a support structure of a shadow mask assembly for a color cathode ray tube, characterized in that a control unit for controlling each unit is included. The method of claim 3, wherein And the holder portion supports the spring on the opposite side to which the force is applied by the driving portion.