KR960011847B1 - Mask-frame assembly and welder device - Google Patents

Abstract

The mask-frame assembly of a color cathode-ray tube comprises : a shadow mask which includes an effective region forming a plurality of sectional hole and an ineffective region in the circumference of the effective region on a face section, welding on a mask-frame; a plurality of the ineffective region on the face section welding on the mask-frame.

Description

Mask frame assembly and its welding apparatus

1 is a cross-sectional view showing the configuration of a welding apparatus of a conventional mask frame assembly.

2a, b are cross-sectional views showing the configuration of the mask frame assembly according to the present invention.

3a, b, and c are sectional views showing the configuration of the mask frame welding apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

S: (conventional) shadow mask

S1, S2: (invention) shadow mask

F: frame 1: lower die

2: upper ide 3: block electrode

4, 5: pressure electrode (加壓 電極)

The present invention relates to a color CRT, and more particularly to a mask frame assembly constructed by welding a shadow mask and a frame and a welding device suitable for welding the same.

The color CRT is an image display device which displays color images by selectively emitting R. G and B phosphors of a fluorescent surface through an electron beam emitted from an electron gun assembly through color selecting means. The most commonly used as such a color screening means is a shadow mask having hundreds of thousands of color apertures. It is preferable that the shadow mask is composed of thin plates as much as possible for accurate color screening. Since the shadow mask, which is a porous thin sheet, is very fragile, it is usually combined with a frame and composed of a mask-frame assembly. Will be used. On the other hand, since the shadow mask is used not only as a color screening means but also as a reference mask for forming each phosphor stripe or dot on the fluorescent surface, the mask frame assembly is often separated and combined with a panel in the CRT manufacturing process. Need to be. Accordingly, it is common to install a plurality of holder springs on the frame of the mask frame assembly so that the holder springs are detachably coupled to stud pins or the like installed on the inner circumference of the panel. to be.

Looking at the manufacturing process of the above-mentioned mask frame assembly, when the shadow mask is manufactured by molding the porous plate to a predetermined shape is welded to the frame. The structure of the conventional welding apparatus used for such a mask frame welding is shown in FIG.

In FIG. 1, on the lower mold L formed in the shape of the shadow mask S, the shadow mask S is placed on the face portion downward, and the stud pins P of the brackets B provided on the lower mold L. FIG. After the frame F is supported by the holder spring H, the weld head W is held in a state in which the upper mold U is lowered to press and support the face part of the shadow mask S. The mask frame is welded by welding the skirt portion Ss of the shadow mask S and the skirt Fs of the frame F to descend.

However, such a conventional shadow mask and its welding apparatus had various problems. That is, the shadow mask S must be provided with a skirt portion Ss to be welded, and the relative positions of the skirt portion Ss and the frame F of the shadow mask S are the panel fluorescent surface and the shadow mask. Since the gap between (S), or common name q, will be determined, the height of the bracket (B) must be precisely adjusted before the start of welding, and this height must be checked during the welding process and readjusted as necessary. In addition, since the face portion Sf of the shadow mask S is pressed by the heavy upper mold U, a problem occurs that the shadow mask S is damaged when an unbalanced force is applied to the welding head W or the like during the welding operation. In addition, since the welding head (W) must enter the gap with the upper mold (U), the device configuration and welding work is very difficult, and the device configuration is complicated for the simultaneous welding of multiple points, the welding is made on the upper part of the shadow mask (S) Therefore, if a splash is generated due to a poor welding condition during welding, the splash will pop into the shadow mask as it is, causing a defect such as clogging.

SUMMARY OF THE INVENTION In view of the above conventional problems, it is an object of the present invention to provide a mask frame assembly which is not structurally limited and can be accurately assembled without any adjustment and is free from damage or clogging.

It is another object of the present invention to provide a welding apparatus which is not only suitable for welding the above-described mask frame assembly of the present invention but also can easily weld the mask frame assembly having a general configuration.

The mask frame assembly for achieving the object of the present invention is a mask frame of a color CRT tube formed by welding a shadow mask to the frame having an effective area having a plurality of color-coded holes and an invalid area around the effective area at its face. In the assembly, the mask frame assembly is constructed by welding a plurality of positions of the non-effective area to the frame.

A mask frame welding apparatus for achieving another object of the present invention is a welding apparatus for welding by placing the shadow mask and the frame therebetween, the welding between the shadow mask and the frame by pressing while applying a voltage to the upper and lower molds, respectively; It is characterized by.

Such specific features and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings.

First, in FIG. 2A, the shadow mask S1 includes an effective area A1 having a color-selecting hole K formed in the face portion Sf thereof, and an invalid area A2 around it. According to the present invention, a plurality of welding projections R are provided in the non-effective area A2 of the face portion Sf.

This welding projection (R) is welded to the flange (Ff) of the frame (F) by projection welding (projection welding), for this purpose, the frame (F) should be provided with a flange (Ff) on the panel side. Preferably, this frame F has a structure disclosed in a mask frame (Utility Model Registration Application No. 93-10169) filed on the same day as the present application. The shadow mask S1 of this embodiment has a skirt portion Ss around the face portion Sf, and the weld projection is inserted into the skirt portion Fs of the frame F. When R is welded to the flange Ff of the frame F, the relative position with the holder spring H to be coupled to the panel, i.e., the distance (q value) from the fluorescent surface, is exactly matched without additional adjustment work.

As described above, since the face part is welded to the frame F, the shadow mask of the present invention may not have a skirt portion. That is, as shown in FIG. 2B, when the shadow mask S2 is composed of only the face portion without the skirt portion, the plurality of welding protrusions R are formed in the non-effective region A2 outside the effective region A1. It is possible to weld to the frame F in the same manner as in FIG. 2 (a).

It is preferable that a welding apparatus as shown in FIG. 3 (a) is used for welding the shadow masks S1 and S2 of the present invention. That is, in FIG. 3 (a), the welding device of the present invention has a frame (F) and a shadow mask (S) supporting a lower face (1) so that the face portion (Sf) faces upward, and the frame with respect to the lower mold (1). The upper mold | type 2 which pressurizes and energizes (F) and the shadow mask S1 is comprised. The upper surface of the lower mold 1 and the lower surface of the upper mold 2 are configured to have a shape corresponding to the shape of the face portion of the shadow mask S1, so that the face portion Sf of the shadow mask S1 during welding is entirely covered. By supporting the above, deformation during welding can be prevented. On the other hand, it is preferable that an end 1a for supporting the frame F is formed outside the lower mold 1, and a block electrode 3 for energizing the frame F side at the time of welding is provided. . Of course, the configuration using the entire lower mold 1 as a block electrode is also possible. That is, in the welding apparatus of the present invention, the upper mold 2 and the lower mold 1 serve as welding electrodes for welding the shadow mask S1 without a separate welding head.

The process of welding the shadow mask and the frame having the configuration as shown in FIG. 2 (a) with the present invention welding apparatus having such a configuration will be described.

As shown in the third (a), when the frame F is loaded on the lower mold 1, the frame F is supported by the flange Ff being hung on the end 1a of the lower mold 1 and the flange Ff. ) Is also in contact with the block electrode 3.

In this state, when the shadow mask S1 is placed on the frame F, the skirt portion Ss is inserted into the outside of the skirt Fs of the frame F so that the shadow mask S1 is automatically aligned to form a shadow mask. The welding protrusion R of S1 is in the state which contacted the flange Ff of the frame F. As shown in FIG. In this state, when the upper die 2 is lowered to pressurize and energize the shadow mask S1, the plurality of welding protrusions R are melted at the same time to form a nugget, thereby forming the shadow mask S1 by the frame F. Welded to the mask frame assembly.

At this time, no matter how many the number of welding projections (R) can be welded at once by one pressurization and energization, the splash is not generated well, there is no defect such as hole clogging. In addition, the construction of the welding device is also significantly simplified compared with the conventional, and the welding is performed in a state that the shadow mask (S1) and the frame (F) is fully supported between the upper and lower molds (1, 2), the position fluctuation or damage during welding Will not occur.

Such a welding device of the present invention is particularly suitable for welding the shadow masks S1 and S2 of the present invention shown in FIGS. 2A and 2B. However, the welding device of the present invention is also used for a shadow mask having a general configuration. It can be used as it is.

That is, the welding apparatus shown in FIG. 3 (b) has a configuration in which a plurality of pressure electrodes 4 are arranged around the lower mold 1 instead of the block electrode 3 of the lower mold 1 of FIG. . When the frame F is placed in the welding device, the lower surface of the flange Ff is supported on the plurality of pressure electrodes 4. Next, the shadow mask S having the general configuration is placed on the upper portion thereof, and the upper mold 2 is lowered to pressurize and energize. The upper mask 2 becomes a block electrode, forming a nugget between the pressing electrodes 4, Welding of S and frame F is performed.

In general, the welding apparatus of the present invention for use in the welding of the shadow mask S may be configured as shown in FIG. This is a configuration in which a plurality of pressure electrodes 5 are arranged around the upper die 2 in the embodiment of FIG. 3 (a), and the pressure electrodes 5 are provided with a shadow mask (ie, an extension surface of the lower surface of the upper die 2). It is installed so as to project slightly to the extent necessary for welding pressurization of S).

The operation of this embodiment is substantially the same as the embodiment of FIG. 3 (b) except that the pressing electrode 5 is provided on the upper mold 2, and thus, a separate description thereof will be omitted.

According to the present invention as described above, it is possible to weld a plurality of welding points at the same time in a simple device configuration without complicated adjustment work, making the manufacturing of the mask frame assembly very simple, damage or positional change of the shadow mask during the welding operation or No defects such as clogging of holes occur. In addition, even if the shadow mask does not have a skirt, the shadow mask is automatically welded to the frame so that it is automatically spaced from the panel, so there is no deterioration in the quality of the finished color CRT.

Accordingly, the present invention has a great effect on reducing the manufacturing cost, improving the productivity, and improving the quality of the color CRT.

Claims (8)

A mask frame assembly of a color CRT tube constructed by welding a shadow mask having an effective area having a plurality of color selection holes formed therein and an invalid area around the effective area to a frame, wherein a plurality of invalid areas of the face part are formed. Mask frame assembly, characterized in that to configure the position of the frame to weld The mask frame assembly of claim 1, wherein the frame has a flange welded to the shadow mask on the shadow mask side. The mask frame assembly of claim 1, wherein a welding protrusion is formed at the plurality of welding positions of the shadow mask. The mask frame assembly of claim 1, wherein the shadow mask comprises only a face portion. A welding device in which a shadow mask and a frame are positioned between an upper mold and a lower mold, wherein the shadow mask and the frame are welded by applying a voltage to the upper mold and the lower mold, respectively. 6. The mask frame welding apparatus according to claim 5, wherein a plurality of pressure electrodes for pressing and energizing the shadow mask and the frame are provided in any one of the upper mold and the lower mold. 6. The mask frame welding apparatus according to claim 5, wherein the frame and the shadow mask are sequentially stacked on the lower shape such that their face portions face upward. 6. The mask frame welding of claim 5, wherein the upper surface of the upper mold and the upper surface of the lower mold are formed to correspond to the shape of the shadow mask, respectively, so that the shadow mask is entirely supported between the upper mold and the lower mold during welding. Device.